ip_nat.c revision 1.2.4.3 1 /* $NetBSD: ip_nat.c,v 1.2.4.3 2012/10/30 17:22:19 yamt Exp $ */
2
3 /*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 */
8 #if defined(KERNEL) || defined(_KERNEL)
9 # undef KERNEL
10 # undef KERNEL
11 # define KERNEL 1
12 # define KERNEL 1
13 #endif
14 #include <sys/errno.h>
15 #include <sys/types.h>
16 #include <sys/param.h>
17 #include <sys/time.h>
18 #include <sys/file.h>
19 #if defined(_KERNEL) && \
20 (defined(__NetBSD_Version) && (__NetBSD_Version >= 399002000))
21 # include <sys/kauth.h>
22 #endif
23 #if !defined(_KERNEL)
24 # include <stdio.h>
25 # include <string.h>
26 # include <stdlib.h>
27 # define KERNEL
28 # ifdef _OpenBSD__
29 struct file;
30 # endif
31 # include <sys/uio.h>
32 # undef KERNEL
33 #endif
34 #if defined(_KERNEL) && \
35 defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
36 # include <sys/filio.h>
37 # include <sys/fcntl.h>
38 #else
39 # include <sys/ioctl.h>
40 #endif
41 #if !defined(AIX)
42 # include <sys/fcntl.h>
43 #endif
44 #if !defined(linux)
45 # include <sys/protosw.h>
46 #endif
47 #include <sys/socket.h>
48 #if defined(_KERNEL)
49 # include <sys/systm.h>
50 # if !defined(__SVR4) && !defined(__svr4__)
51 # include <sys/mbuf.h>
52 # endif
53 #endif
54 #if defined(__SVR4) || defined(__svr4__)
55 # include <sys/filio.h>
56 # include <sys/byteorder.h>
57 # ifdef KERNEL
58 # include <sys/dditypes.h>
59 # endif
60 # include <sys/stream.h>
61 # include <sys/kmem.h>
62 #endif
63 #if _FreeBSD_version >= 300000
64 # include <sys/queue.h>
65 #endif
66 #include <net/if.h>
67 #if _FreeBSD_version >= 300000
68 # include <net/if_var.h>
69 #endif
70 #ifdef sun
71 # include <net/af.h>
72 #endif
73 #include <netinet/in.h>
74 #include <netinet/in_systm.h>
75 #include <netinet/ip.h>
76
77 #ifdef RFC1825
78 # include <vpn/md5.h>
79 # include <vpn/ipsec.h>
80 extern struct ifnet vpnif;
81 #endif
82
83 #if !defined(linux)
84 # include <netinet/ip_var.h>
85 #endif
86 #include <netinet/tcp.h>
87 #include <netinet/udp.h>
88 #include <netinet/ip_icmp.h>
89 #include "netinet/ip_compat.h"
90 #include <netinet/tcpip.h>
91 #include "netinet/ipl.h"
92 #include "netinet/ip_fil.h"
93 #include "netinet/ip_nat.h"
94 #include "netinet/ip_frag.h"
95 #include "netinet/ip_state.h"
96 #include "netinet/ip_proxy.h"
97 #include "netinet/ip_lookup.h"
98 #include "netinet/ip_dstlist.h"
99 #include "netinet/ip_sync.h"
100 #if FREEBSD_GE_REV(300000)
101 # include <sys/malloc.h>
102 #endif
103 #ifdef HAS_SYS_MD5_H
104 # include <sys/md5.h>
105 #else
106 # include "md5.h"
107 #endif
108 /* END OF INCLUDES */
109
110 #undef SOCKADDR_IN
111 #define SOCKADDR_IN struct sockaddr_in
112
113 #if !defined(lint)
114 #if defined(__NetBSD__)
115 #include <sys/cdefs.h>
116 __KERNEL_RCSID(0, "$NetBSD: ip_nat.c,v 1.2.4.3 2012/10/30 17:22:19 yamt Exp $");
117 #else
118 static const char sccsid[] = "@(#)ip_nat.c 1.11 6/5/96 (C) 1995 Darren Reed";
119 static const char rcsid[] = "@(#)Id: ip_nat.c,v 1.1.1.2 2012/07/22 13:45:27 darrenr Exp";
120 #endif
121 #endif
122
123
124 #define NATFSUM(n,v,f) ((v) == 4 ? (n)->f.in4.s_addr : (n)->f.i6[0] + \
125 (n)->f.i6[1] + (n)->f.i6[2] + (n)->f.i6[3])
126 #define NBUMP(x) softn->(x)++
127 #define NBUMPD(x, y) do { \
128 softn->x.y++; \
129 DT(y); \
130 } while (0)
131 #define NBUMPSIDE(y,x) softn->ipf_nat_stats.ns_side[y].x++
132 #define NBUMPSIDED(y,x) do { softn->ipf_nat_stats.ns_side[y].x++; \
133 DT(x); } while (0)
134 #define NBUMPSIDEX(y,x,z) \
135 do { softn->ipf_nat_stats.ns_side[y].x++; \
136 DT(z); } while (0)
137 #define NBUMPSIDEDF(y,x)do { softn->ipf_nat_stats.ns_side[y].x++; \
138 DT1(x, fr_info_t *, fin); } while (0)
139
140 frentry_t ipfnatblock;
141
142 static ipftuneable_t ipf_nat_tuneables[] = {
143 /* nat */
144 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_lock) },
145 "nat_lock", 0, 1,
146 stsizeof(ipf_nat_softc_t, ipf_nat_lock),
147 IPFT_RDONLY, NULL, NULL },
148 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_sz) },
149 "nat_table_size", 1, 0x7fffffff,
150 stsizeof(ipf_nat_softc_t, ipf_nat_table_sz),
151 0, NULL, ipf_nat_rehash },
152 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_max) },
153 "nat_table_max", 1, 0x7fffffff,
154 stsizeof(ipf_nat_softc_t, ipf_nat_table_max),
155 0, NULL, NULL },
156 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maprules_sz) },
157 "nat_rules_size", 1, 0x7fffffff,
158 stsizeof(ipf_nat_softc_t, ipf_nat_maprules_sz),
159 0, NULL, ipf_nat_rehash_rules },
160 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_rdrrules_sz) },
161 "rdr_rules_size", 1, 0x7fffffff,
162 stsizeof(ipf_nat_softc_t, ipf_nat_rdrrules_sz),
163 0, NULL, ipf_nat_rehash_rules },
164 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_hostmap_sz) },
165 "hostmap_size", 1, 0x7fffffff,
166 stsizeof(ipf_nat_softc_t, ipf_nat_hostmap_sz),
167 0, NULL, ipf_nat_hostmap_rehash },
168 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maxbucket) },
169 "nat_maxbucket",1, 0x7fffffff,
170 stsizeof(ipf_nat_softc_t, ipf_nat_maxbucket),
171 0, NULL, NULL },
172 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_logging) },
173 "nat_logging", 0, 1,
174 stsizeof(ipf_nat_softc_t, ipf_nat_logging),
175 0, NULL, NULL },
176 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_doflush) },
177 "nat_doflush", 0, 1,
178 stsizeof(ipf_nat_softc_t, ipf_nat_doflush),
179 0, NULL, NULL },
180 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_low) },
181 "nat_table_wm_low", 1, 99,
182 stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_low),
183 0, NULL, NULL },
184 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_high) },
185 "nat_table_wm_high", 2, 100,
186 stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_high),
187 0, NULL, NULL },
188 { { 0 },
189 NULL, 0, 0,
190 0,
191 0, NULL, NULL }
192 };
193
194 /* ======================================================================== */
195 /* How the NAT is organised and works. */
196 /* */
197 /* Inside (interface y) NAT Outside (interface x) */
198 /* -------------------- -+- ------------------------------------- */
199 /* Packet going | out, processsed by ipf_nat_checkout() for x */
200 /* ------------> | ------------> */
201 /* src=10.1.1.1 | src=192.1.1.1 */
202 /* | */
203 /* | in, processed by ipf_nat_checkin() for x */
204 /* <------------ | <------------ */
205 /* dst=10.1.1.1 | dst=192.1.1.1 */
206 /* -------------------- -+- ------------------------------------- */
207 /* ipf_nat_checkout() - changes ip_src and if required, sport */
208 /* - creates a new mapping, if required. */
209 /* ipf_nat_checkin() - changes ip_dst and if required, dport */
210 /* */
211 /* In the NAT table, internal source is recorded as "in" and externally */
212 /* seen as "out". */
213 /* ======================================================================== */
214
215
216 #if SOLARIS && !defined(INSTANCES)
217 extern int pfil_delayed_copy;
218 #endif
219
220 static int ipf_nat_flush_entry(ipf_main_softc_t *, void *);
221 static int ipf_nat_getent(ipf_main_softc_t *, void *, int);
222 static int ipf_nat_getsz(ipf_main_softc_t *, void *, int);
223 static int ipf_nat_putent(ipf_main_softc_t *, void *, int);
224 static void ipf_nat_addmap(ipf_nat_softc_t *, ipnat_t *);
225 static void ipf_nat_addrdr(ipf_nat_softc_t *, ipnat_t *);
226 static int ipf_nat_builddivertmp(ipf_nat_softc_t *, ipnat_t *);
227 static int ipf_nat_clearlist(ipf_main_softc_t *, ipf_nat_softc_t *);
228 static int ipf_nat_cmp_rules(ipnat_t *, ipnat_t *);
229 static int ipf_nat_decap(fr_info_t *, nat_t *);
230 static void ipf_nat_delrule(ipf_main_softc_t *, ipf_nat_softc_t *,
231 ipnat_t *, int);
232 static int ipf_nat_extraflush(ipf_main_softc_t *, ipf_nat_softc_t *, int);
233 static int ipf_nat_finalise(fr_info_t *, nat_t *);
234 static int ipf_nat_flushtable(ipf_main_softc_t *, ipf_nat_softc_t *);
235 static int ipf_nat_getnext(ipf_main_softc_t *, ipftoken_t *,
236 ipfgeniter_t *, ipfobj_t *);
237 static int ipf_nat_gettable(ipf_main_softc_t *, ipf_nat_softc_t *, char *);
238 static hostmap_t *ipf_nat_hostmap(ipf_nat_softc_t *, ipnat_t *,
239 struct in_addr, struct in_addr,
240 struct in_addr, u_32_t);
241 static int ipf_nat_icmpquerytype(int);
242 static int ipf_nat_iterator(ipf_main_softc_t *, ipftoken_t *,
243 ipfgeniter_t *, ipfobj_t *);
244 static int ipf_nat_match(fr_info_t *, ipnat_t *);
245 static int ipf_nat_matcharray(nat_t *, int *, u_long);
246 static int ipf_nat_matchflush(ipf_main_softc_t *, ipf_nat_softc_t *,
247 void *);
248 static void ipf_nat_mssclamp(tcphdr_t *, u_32_t, fr_info_t *, u_short *);
249 static int ipf_nat_newmap(fr_info_t *, nat_t *, natinfo_t *);
250 static int ipf_nat_newdivert(fr_info_t *, nat_t *, natinfo_t *);
251 static int ipf_nat_newrdr(fr_info_t *, nat_t *, natinfo_t *);
252 static int ipf_nat_newrewrite(fr_info_t *, nat_t *, natinfo_t *);
253 static int ipf_nat_nextaddr(fr_info_t *, nat_addr_t *, u_32_t *, u_32_t *);
254 static int ipf_nat_nextaddrinit(ipf_main_softc_t *, char *,
255 nat_addr_t *, int, void *);
256 static int ipf_nat_resolverule(ipf_main_softc_t *, ipnat_t *);
257 static int ipf_nat_ruleaddrinit(ipf_main_softc_t *,
258 ipf_nat_softc_t *, ipnat_t *);
259 static void ipf_nat_rule_fini(ipf_main_softc_t *, ipnat_t *);
260 static int ipf_nat_rule_init(ipf_main_softc_t *, ipf_nat_softc_t *,
261 ipnat_t *);
262 static int ipf_nat_siocaddnat(ipf_main_softc_t *, ipf_nat_softc_t *,
263 ipnat_t *, int);
264 static void ipf_nat_siocdelnat(ipf_main_softc_t *, ipf_nat_softc_t *,
265 ipnat_t *, int);
266 static void ipf_nat_tabmove(ipf_nat_softc_t *, nat_t *);
267
268 /* ------------------------------------------------------------------------ */
269 /* Function: ipf_nat_main_load */
270 /* Returns: int - 0 == success, -1 == failure */
271 /* Parameters: Nil */
272 /* */
273 /* The only global NAT structure that needs to be initialised is the filter */
274 /* rule that is used with blocking packets. */
275 /* ------------------------------------------------------------------------ */
276 int
277 ipf_nat_main_load(void)
278 {
279 bzero((char *)&ipfnatblock, sizeof(ipfnatblock));
280 ipfnatblock.fr_flags = FR_BLOCK|FR_QUICK;
281 ipfnatblock.fr_ref = 1;
282
283 return 0;
284 }
285
286
287 /* ------------------------------------------------------------------------ */
288 /* Function: ipf_nat_main_unload */
289 /* Returns: int - 0 == success, -1 == failure */
290 /* Parameters: Nil */
291 /* */
292 /* A null-op function that exists as a placeholder so that the flow in */
293 /* other functions is obvious. */
294 /* ------------------------------------------------------------------------ */
295 int
296 ipf_nat_main_unload(void)
297 {
298 return 0;
299 }
300
301
302 /* ------------------------------------------------------------------------ */
303 /* Function: ipf_nat_soft_create */
304 /* Returns: void * - NULL = failure, else pointer to NAT context */
305 /* Parameters: softc(I) - pointer to soft context main structure */
306 /* */
307 /* Allocate the initial soft context structure for NAT and populate it with */
308 /* some default values. Creating the tables is left until we call _init so */
309 /* that sizes can be changed before we get under way. */
310 /* ------------------------------------------------------------------------ */
311 void *
312 ipf_nat_soft_create(ipf_main_softc_t *softc)
313 {
314 ipf_nat_softc_t *softn;
315
316 KMALLOC(softn, ipf_nat_softc_t *);
317 if (softn == NULL)
318 return NULL;
319
320 bzero((char *)softn, sizeof(*softn));
321
322 softn->ipf_nat_tune = ipf_tune_array_copy(softn,
323 sizeof(ipf_nat_tuneables),
324 ipf_nat_tuneables);
325 if (softn->ipf_nat_tune == NULL) {
326 ipf_nat_soft_destroy(softc, softn);
327 return NULL;
328 }
329 if (ipf_tune_array_link(softc, softn->ipf_nat_tune) == -1) {
330 ipf_nat_soft_destroy(softc, softn);
331 return NULL;
332 }
333
334 softn->ipf_nat_list_tail = &softn->ipf_nat_list;
335
336 softn->ipf_nat_table_max = NAT_TABLE_MAX;
337 softn->ipf_nat_table_sz = NAT_TABLE_SZ;
338 softn->ipf_nat_maprules_sz = NAT_SIZE;
339 softn->ipf_nat_rdrrules_sz = RDR_SIZE;
340 softn->ipf_nat_hostmap_sz = HOSTMAP_SIZE;
341 softn->ipf_nat_doflush = 0;
342 #ifdef IPFILTER_LOG
343 softn->ipf_nat_logging = 1;
344 #else
345 softn->ipf_nat_logging = 0;
346 #endif
347
348 softn->ipf_nat_defage = DEF_NAT_AGE;
349 softn->ipf_nat_defipage = IPF_TTLVAL(60);
350 softn->ipf_nat_deficmpage = IPF_TTLVAL(3);
351 softn->ipf_nat_table_wm_high = 99;
352 softn->ipf_nat_table_wm_low = 90;
353
354 return softn;
355 }
356
357 /* ------------------------------------------------------------------------ */
358 /* Function: ipf_nat_soft_destroy */
359 /* Returns: Nil */
360 /* Parameters: softc(I) - pointer to soft context main structure */
361 /* */
362 /* ------------------------------------------------------------------------ */
363 void
364 ipf_nat_soft_destroy(ipf_main_softc_t *softc, void *arg)
365 {
366 ipf_nat_softc_t *softn = arg;
367
368 if (softn->ipf_nat_tune != NULL) {
369 ipf_tune_array_unlink(softc, softn->ipf_nat_tune);
370 KFREES(softn->ipf_nat_tune, sizeof(ipf_nat_tuneables));
371 softn->ipf_nat_tune = NULL;
372 }
373
374 KFREE(softn);
375 }
376
377
378 /* ------------------------------------------------------------------------ */
379 /* Function: ipf_nat_init */
380 /* Returns: int - 0 == success, -1 == failure */
381 /* Parameters: softc(I) - pointer to soft context main structure */
382 /* */
383 /* Initialise all of the NAT locks, tables and other structures. */
384 /* ------------------------------------------------------------------------ */
385 int
386 ipf_nat_soft_init(ipf_main_softc_t *softc, void *arg)
387 {
388 ipf_nat_softc_t *softn = arg;
389 ipftq_t *tq;
390 int i;
391
392 KMALLOCS(softn->ipf_nat_table[0], nat_t **, \
393 sizeof(nat_t *) * softn->ipf_nat_table_sz);
394
395 if (softn->ipf_nat_table[0] != NULL) {
396 bzero((char *)softn->ipf_nat_table[0],
397 softn->ipf_nat_table_sz * sizeof(nat_t *));
398 } else {
399 return -1;
400 }
401
402 KMALLOCS(softn->ipf_nat_table[1], nat_t **, \
403 sizeof(nat_t *) * softn->ipf_nat_table_sz);
404
405 if (softn->ipf_nat_table[1] != NULL) {
406 bzero((char *)softn->ipf_nat_table[1],
407 softn->ipf_nat_table_sz * sizeof(nat_t *));
408 } else {
409 return -2;
410 }
411
412 KMALLOCS(softn->ipf_nat_map_rules, ipnat_t **, \
413 sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz);
414
415 if (softn->ipf_nat_map_rules != NULL) {
416 bzero((char *)softn->ipf_nat_map_rules,
417 softn->ipf_nat_maprules_sz * sizeof(ipnat_t *));
418 } else {
419 return -3;
420 }
421
422 KMALLOCS(softn->ipf_nat_rdr_rules, ipnat_t **, \
423 sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz);
424
425 if (softn->ipf_nat_rdr_rules != NULL) {
426 bzero((char *)softn->ipf_nat_rdr_rules,
427 softn->ipf_nat_rdrrules_sz * sizeof(ipnat_t *));
428 } else {
429 return -4;
430 }
431
432 KMALLOCS(softn->ipf_hm_maptable, hostmap_t **, \
433 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz);
434
435 if (softn->ipf_hm_maptable != NULL) {
436 bzero((char *)softn->ipf_hm_maptable,
437 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz);
438 } else {
439 return -5;
440 }
441 softn->ipf_hm_maplist = NULL;
442
443 KMALLOCS(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, u_int *,
444 softn->ipf_nat_table_sz * sizeof(u_int));
445
446 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen == NULL) {
447 return -6;
448 }
449 bzero((char *)softn->ipf_nat_stats.ns_side[0].ns_bucketlen,
450 softn->ipf_nat_table_sz * sizeof(u_int));
451
452 KMALLOCS(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, u_int *,
453 softn->ipf_nat_table_sz * sizeof(u_int));
454
455 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen == NULL) {
456 return -7;
457 }
458
459 bzero((char *)softn->ipf_nat_stats.ns_side[1].ns_bucketlen,
460 softn->ipf_nat_table_sz * sizeof(u_int));
461
462 if (softn->ipf_nat_maxbucket == 0) {
463 for (i = softn->ipf_nat_table_sz; i > 0; i >>= 1)
464 softn->ipf_nat_maxbucket++;
465 softn->ipf_nat_maxbucket *= 2;
466 }
467
468 ipf_sttab_init(softc, softn->ipf_nat_tcptq);
469 /*
470 * Increase this because we may have "keep state" following this too
471 * and packet storms can occur if this is removed too quickly.
472 */
473 softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack;
474 softn->ipf_nat_tcptq[IPF_TCP_NSTATES - 1].ifq_next =
475 &softn->ipf_nat_udptq;
476
477 IPFTQ_INIT(&softn->ipf_nat_udptq, softn->ipf_nat_defage,
478 "nat ipftq udp tab");
479 softn->ipf_nat_udptq.ifq_next = &softn->ipf_nat_udpacktq;
480
481 IPFTQ_INIT(&softn->ipf_nat_udpacktq, softn->ipf_nat_defage,
482 "nat ipftq udpack tab");
483 softn->ipf_nat_udpacktq.ifq_next = &softn->ipf_nat_icmptq;
484
485 IPFTQ_INIT(&softn->ipf_nat_icmptq, softn->ipf_nat_deficmpage,
486 "nat icmp ipftq tab");
487 softn->ipf_nat_icmptq.ifq_next = &softn->ipf_nat_icmpacktq;
488
489 IPFTQ_INIT(&softn->ipf_nat_icmpacktq, softn->ipf_nat_defage,
490 "nat icmpack ipftq tab");
491 softn->ipf_nat_icmpacktq.ifq_next = &softn->ipf_nat_iptq;
492
493 IPFTQ_INIT(&softn->ipf_nat_iptq, softn->ipf_nat_defipage,
494 "nat ip ipftq tab");
495 softn->ipf_nat_iptq.ifq_next = &softn->ipf_nat_pending;
496
497 IPFTQ_INIT(&softn->ipf_nat_pending, 1, "nat pending ipftq tab");
498 softn->ipf_nat_pending.ifq_next = NULL;
499
500 for (i = 0, tq = softn->ipf_nat_tcptq; i < IPF_TCP_NSTATES; i++, tq++) {
501 if (tq->ifq_ttl < softn->ipf_nat_deficmpage)
502 tq->ifq_ttl = softn->ipf_nat_deficmpage;
503 #ifdef LARGE_NAT
504 else if (tq->ifq_ttl > softn->ipf_nat_defage)
505 tq->ifq_ttl = softn->ipf_nat_defage;
506 #endif
507 }
508
509 /*
510 * Increase this because we may have "keep state" following
511 * this too and packet storms can occur if this is removed
512 * too quickly.
513 */
514 softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack;
515
516 MUTEX_INIT(&softn->ipf_nat_new, "ipf nat new mutex");
517 MUTEX_INIT(&softn->ipf_nat_io, "ipf nat io mutex");
518
519 softn->ipf_nat_inited = 1;
520
521 return 0;
522 }
523
524
525 /* ------------------------------------------------------------------------ */
526 /* Function: ipf_nat_soft_fini */
527 /* Returns: Nil */
528 /* Parameters: softc(I) - pointer to soft context main structure */
529 /* */
530 /* Free all memory used by NAT structures allocated at runtime. */
531 /* ------------------------------------------------------------------------ */
532 int
533 ipf_nat_soft_fini(ipf_main_softc_t *softc, void *arg)
534 {
535 ipf_nat_softc_t *softn = arg;
536 ipftq_t *ifq, *ifqnext;
537
538 (void) ipf_nat_clearlist(softc, softn);
539 (void) ipf_nat_flushtable(softc, softn);
540
541 /*
542 * Proxy timeout queues are not cleaned here because although they
543 * exist on the NAT list, ipf_proxy_unload is called after unload
544 * and the proxies actually are responsible for them being created.
545 * Should the proxy timeouts have their own list? There's no real
546 * justification as this is the only complication.
547 */
548 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) {
549 ifqnext = ifq->ifq_next;
550 if (ipf_deletetimeoutqueue(ifq) == 0)
551 ipf_freetimeoutqueue(softc, ifq);
552 }
553
554 if (softn->ipf_nat_table[0] != NULL) {
555 KFREES(softn->ipf_nat_table[0],
556 sizeof(nat_t *) * softn->ipf_nat_table_sz);
557 softn->ipf_nat_table[0] = NULL;
558 }
559 if (softn->ipf_nat_table[1] != NULL) {
560 KFREES(softn->ipf_nat_table[1],
561 sizeof(nat_t *) * softn->ipf_nat_table_sz);
562 softn->ipf_nat_table[1] = NULL;
563 }
564 if (softn->ipf_nat_map_rules != NULL) {
565 KFREES(softn->ipf_nat_map_rules,
566 sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz);
567 softn->ipf_nat_map_rules = NULL;
568 }
569 if (softn->ipf_nat_rdr_rules != NULL) {
570 KFREES(softn->ipf_nat_rdr_rules,
571 sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz);
572 softn->ipf_nat_rdr_rules = NULL;
573 }
574 if (softn->ipf_hm_maptable != NULL) {
575 KFREES(softn->ipf_hm_maptable,
576 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz);
577 softn->ipf_hm_maptable = NULL;
578 }
579 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) {
580 KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen,
581 sizeof(u_int) * softn->ipf_nat_table_sz);
582 softn->ipf_nat_stats.ns_side[0].ns_bucketlen = NULL;
583 }
584 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) {
585 KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen,
586 sizeof(u_int) * softn->ipf_nat_table_sz);
587 softn->ipf_nat_stats.ns_side[1].ns_bucketlen = NULL;
588 }
589
590 if (softn->ipf_nat_inited == 1) {
591 softn->ipf_nat_inited = 0;
592 ipf_sttab_destroy(softn->ipf_nat_tcptq);
593
594 MUTEX_DESTROY(&softn->ipf_nat_new);
595 MUTEX_DESTROY(&softn->ipf_nat_io);
596
597 MUTEX_DESTROY(&softn->ipf_nat_udptq.ifq_lock);
598 MUTEX_DESTROY(&softn->ipf_nat_udpacktq.ifq_lock);
599 MUTEX_DESTROY(&softn->ipf_nat_icmptq.ifq_lock);
600 MUTEX_DESTROY(&softn->ipf_nat_icmpacktq.ifq_lock);
601 MUTEX_DESTROY(&softn->ipf_nat_iptq.ifq_lock);
602 MUTEX_DESTROY(&softn->ipf_nat_pending.ifq_lock);
603 }
604
605 return 0;
606 }
607
608
609 /* ------------------------------------------------------------------------ */
610 /* Function: ipf_nat_setlock */
611 /* Returns: Nil */
612 /* Parameters: arg(I) - pointer to soft state information */
613 /* tmp(I) - new lock value */
614 /* */
615 /* Set the "lock status" of NAT to the value in tmp. */
616 /* ------------------------------------------------------------------------ */
617 void
618 ipf_nat_setlock(void *arg, int tmp)
619 {
620 ipf_nat_softc_t *softn = arg;
621
622 softn->ipf_nat_lock = tmp;
623 }
624
625
626 /* ------------------------------------------------------------------------ */
627 /* Function: ipf_nat_addrdr */
628 /* Returns: Nil */
629 /* Parameters: n(I) - pointer to NAT rule to add */
630 /* */
631 /* Adds a redirect rule to the hash table of redirect rules and the list of */
632 /* loaded NAT rules. Updates the bitmask indicating which netmasks are in */
633 /* use by redirect rules. */
634 /* ------------------------------------------------------------------------ */
635 static void
636 ipf_nat_addrdr(ipf_nat_softc_t *softn, ipnat_t *n)
637 {
638 ipnat_t **np;
639 u_32_t j;
640 u_int hv;
641 u_int rhv;
642 int k;
643
644 if (n->in_odstatype == FRI_NORMAL) {
645 k = count4bits(n->in_odstmsk);
646 ipf_inet_mask_add(k, &softn->ipf_nat_rdr_mask);
647 j = (n->in_odstaddr & n->in_odstmsk);
648 rhv = NAT_HASH_FN(j, 0, 0xffffffff);
649 } else {
650 ipf_inet_mask_add(0, &softn->ipf_nat_rdr_mask);
651 j = 0;
652 rhv = 0;
653 }
654 hv = rhv % softn->ipf_nat_rdrrules_sz;
655 np = softn->ipf_nat_rdr_rules + hv;
656 while (*np != NULL)
657 np = &(*np)->in_rnext;
658 n->in_rnext = NULL;
659 n->in_prnext = np;
660 n->in_hv[0] = hv;
661 n->in_use++;
662 *np = n;
663 }
664
665
666 /* ------------------------------------------------------------------------ */
667 /* Function: ipf_nat_addmap */
668 /* Returns: Nil */
669 /* Parameters: n(I) - pointer to NAT rule to add */
670 /* */
671 /* Adds a NAT map rule to the hash table of rules and the list of loaded */
672 /* NAT rules. Updates the bitmask indicating which netmasks are in use by */
673 /* redirect rules. */
674 /* ------------------------------------------------------------------------ */
675 static void
676 ipf_nat_addmap(ipf_nat_softc_t *softn, ipnat_t *n)
677 {
678 ipnat_t **np;
679 u_32_t j;
680 u_int hv;
681 u_int rhv;
682 int k;
683
684 if (n->in_osrcatype == FRI_NORMAL) {
685 k = count4bits(n->in_osrcmsk);
686 ipf_inet_mask_add(k, &softn->ipf_nat_map_mask);
687 j = (n->in_osrcaddr & n->in_osrcmsk);
688 rhv = NAT_HASH_FN(j, 0, 0xffffffff);
689 } else {
690 ipf_inet_mask_add(0, &softn->ipf_nat_map_mask);
691 j = 0;
692 rhv = 0;
693 }
694 hv = rhv % softn->ipf_nat_maprules_sz;
695 np = softn->ipf_nat_map_rules + hv;
696 while (*np != NULL)
697 np = &(*np)->in_mnext;
698 n->in_mnext = NULL;
699 n->in_pmnext = np;
700 n->in_hv[1] = rhv;
701 n->in_use++;
702 *np = n;
703 }
704
705
706 /* ------------------------------------------------------------------------ */
707 /* Function: ipf_nat_delrdr */
708 /* Returns: Nil */
709 /* Parameters: n(I) - pointer to NAT rule to delete */
710 /* */
711 /* Removes a redirect rule from the hash table of redirect rules. */
712 /* ------------------------------------------------------------------------ */
713 void
714 ipf_nat_delrdr(ipf_nat_softc_t *softn, ipnat_t *n)
715 {
716 if (n->in_odstatype == FRI_NORMAL) {
717 int k = count4bits(n->in_odstmsk);
718 ipf_inet_mask_del(k, &softn->ipf_nat_rdr_mask);
719 } else {
720 ipf_inet_mask_del(0, &softn->ipf_nat_rdr_mask);
721 }
722 if (n->in_rnext)
723 n->in_rnext->in_prnext = n->in_prnext;
724 *n->in_prnext = n->in_rnext;
725 n->in_use--;
726 }
727
728
729 /* ------------------------------------------------------------------------ */
730 /* Function: ipf_nat_delmap */
731 /* Returns: Nil */
732 /* Parameters: n(I) - pointer to NAT rule to delete */
733 /* */
734 /* Removes a NAT map rule from the hash table of NAT map rules. */
735 /* ------------------------------------------------------------------------ */
736 void
737 ipf_nat_delmap(ipf_nat_softc_t *softn, ipnat_t *n)
738 {
739 if (n->in_osrcatype == FRI_NORMAL) {
740 int k = count4bits(n->in_osrcmsk);
741 ipf_inet_mask_del(k, &softn->ipf_nat_map_mask);
742 } else {
743 ipf_inet_mask_del(0, &softn->ipf_nat_map_mask);
744 }
745 if (n->in_mnext != NULL)
746 n->in_mnext->in_pmnext = n->in_pmnext;
747 *n->in_pmnext = n->in_mnext;
748 n->in_use--;
749 }
750
751
752 /* ------------------------------------------------------------------------ */
753 /* Function: ipf_nat_hostmap */
754 /* Returns: struct hostmap* - NULL if no hostmap could be created, */
755 /* else a pointer to the hostmapping to use */
756 /* Parameters: np(I) - pointer to NAT rule */
757 /* real(I) - real IP address */
758 /* map(I) - mapped IP address */
759 /* port(I) - destination port number */
760 /* Write Locks: ipf_nat */
761 /* */
762 /* Check if an ip address has already been allocated for a given mapping */
763 /* that is not doing port based translation. If is not yet allocated, then */
764 /* create a new entry if a non-NULL NAT rule pointer has been supplied. */
765 /* ------------------------------------------------------------------------ */
766 static struct hostmap *
767 ipf_nat_hostmap(ipf_nat_softc_t *softn, ipnat_t *np, struct in_addr src,
768 struct in_addr dst, struct in_addr map, u_32_t port)
769 {
770 hostmap_t *hm;
771 u_int hv, rhv;
772
773 hv = (src.s_addr ^ dst.s_addr);
774 hv += src.s_addr;
775 hv += dst.s_addr;
776 rhv = hv;
777 hv %= softn->ipf_nat_hostmap_sz;
778 for (hm = softn->ipf_hm_maptable[hv]; hm; hm = hm->hm_hnext)
779 if ((hm->hm_osrcip.s_addr == src.s_addr) &&
780 (hm->hm_odstip.s_addr == dst.s_addr) &&
781 ((np == NULL) || (np == hm->hm_ipnat)) &&
782 ((port == 0) || (port == hm->hm_port))) {
783 softn->ipf_nat_stats.ns_hm_addref++;
784 hm->hm_ref++;
785 return hm;
786 }
787
788 if (np == NULL) {
789 softn->ipf_nat_stats.ns_hm_nullnp++;
790 return NULL;
791 }
792
793 KMALLOC(hm, hostmap_t *);
794 if (hm) {
795 hm->hm_next = softn->ipf_hm_maplist;
796 hm->hm_pnext = &softn->ipf_hm_maplist;
797 if (softn->ipf_hm_maplist != NULL)
798 softn->ipf_hm_maplist->hm_pnext = &hm->hm_next;
799 softn->ipf_hm_maplist = hm;
800 hm->hm_hnext = softn->ipf_hm_maptable[hv];
801 hm->hm_phnext = softn->ipf_hm_maptable + hv;
802 if (softn->ipf_hm_maptable[hv] != NULL)
803 softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext;
804 softn->ipf_hm_maptable[hv] = hm;
805 hm->hm_ipnat = np;
806 np->in_use++;
807 hm->hm_osrcip = src;
808 hm->hm_odstip = dst;
809 hm->hm_nsrcip = map;
810 hm->hm_ndstip.s_addr = 0;
811 hm->hm_ref = 1;
812 hm->hm_port = port;
813 hm->hm_hv = rhv;
814 hm->hm_v = 4;
815 softn->ipf_nat_stats.ns_hm_new++;
816 } else {
817 softn->ipf_nat_stats.ns_hm_newfail++;
818 }
819 return hm;
820 }
821
822
823 /* ------------------------------------------------------------------------ */
824 /* Function: ipf_nat_hostmapdel */
825 /* Returns: Nil */
826 /* Parameters: hmp(I) - pointer to hostmap structure pointer */
827 /* Write Locks: ipf_nat */
828 /* */
829 /* Decrement the references to this hostmap structure by one. If this */
830 /* reaches zero then remove it and free it. */
831 /* ------------------------------------------------------------------------ */
832 void
833 ipf_nat_hostmapdel(ipf_main_softc_t *softc, struct hostmap **hmp)
834 {
835 struct hostmap *hm;
836
837 hm = *hmp;
838 *hmp = NULL;
839
840 hm->hm_ref--;
841 if (hm->hm_ref == 0) {
842 ipf_nat_rule_deref(softc, &hm->hm_ipnat);
843 if (hm->hm_hnext)
844 hm->hm_hnext->hm_phnext = hm->hm_phnext;
845 *hm->hm_phnext = hm->hm_hnext;
846 if (hm->hm_next)
847 hm->hm_next->hm_pnext = hm->hm_pnext;
848 *hm->hm_pnext = hm->hm_next;
849 KFREE(hm);
850 }
851 }
852
853
854 /* ------------------------------------------------------------------------ */
855 /* Function: ipf_fix_outcksum */
856 /* Returns: Nil */
857 /* Parameters: fin(I) - pointer to packet information */
858 /* sp(I) - location of 16bit checksum to update */
859 /* n((I) - amount to adjust checksum by */
860 /* */
861 /* Adjusts the 16bit checksum by "n" for packets going out. */
862 /* ------------------------------------------------------------------------ */
863 void
864 ipf_fix_outcksum(int cksum, u_short *sp, u_32_t n, u_32_t partial)
865 {
866 u_short sumshort;
867 u_32_t sum1;
868
869 if (n == 0)
870 return;
871
872 if (cksum == 4) {
873 *sp = 0;
874 return;
875 }
876 if (cksum == 2) {
877 sum1 = partial;
878 sum1 = (sum1 & 0xffff) + (sum1 >> 16);
879 *sp = htons(sum1);
880 return;
881 }
882 sum1 = (~ntohs(*sp)) & 0xffff;
883 sum1 += (n);
884 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
885 /* Again */
886 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
887 sumshort = ~(u_short)sum1;
888 *(sp) = htons(sumshort);
889 }
890
891
892 /* ------------------------------------------------------------------------ */
893 /* Function: ipf_fix_incksum */
894 /* Returns: Nil */
895 /* Parameters: fin(I) - pointer to packet information */
896 /* sp(I) - location of 16bit checksum to update */
897 /* n((I) - amount to adjust checksum by */
898 /* */
899 /* Adjusts the 16bit checksum by "n" for packets going in. */
900 /* ------------------------------------------------------------------------ */
901 void
902 ipf_fix_incksum(int cksum, u_short *sp, u_32_t n, u_32_t partial)
903 {
904 u_short sumshort;
905 u_32_t sum1;
906
907 if (n == 0)
908 return;
909
910 if (cksum == 4) {
911 *sp = 0;
912 return;
913 }
914 if (cksum == 2) {
915 sum1 = partial;
916 sum1 = (sum1 & 0xffff) + (sum1 >> 16);
917 *sp = htons(sum1);
918 return;
919 }
920
921 sum1 = (~ntohs(*sp)) & 0xffff;
922 sum1 += ~(n) & 0xffff;
923 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
924 /* Again */
925 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
926 sumshort = ~(u_short)sum1;
927 *(sp) = htons(sumshort);
928 }
929
930
931 /* ------------------------------------------------------------------------ */
932 /* Function: ipf_fix_datacksum */
933 /* Returns: Nil */
934 /* Parameters: sp(I) - location of 16bit checksum to update */
935 /* n((I) - amount to adjust checksum by */
936 /* */
937 /* Fix_datacksum is used *only* for the adjustments of checksums in the */
938 /* data section of an IP packet. */
939 /* */
940 /* The only situation in which you need to do this is when NAT'ing an */
941 /* ICMP error message. Such a message, contains in its body the IP header */
942 /* of the original IP packet, that causes the error. */
943 /* */
944 /* You can't use fix_incksum or fix_outcksum in that case, because for the */
945 /* kernel the data section of the ICMP error is just data, and no special */
946 /* processing like hardware cksum or ntohs processing have been done by the */
947 /* kernel on the data section. */
948 /* ------------------------------------------------------------------------ */
949 void
950 ipf_fix_datacksum(u_short *sp, u_32_t n)
951 {
952 u_short sumshort;
953 u_32_t sum1;
954
955 if (n == 0)
956 return;
957
958 sum1 = (~ntohs(*sp)) & 0xffff;
959 sum1 += (n);
960 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
961 /* Again */
962 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
963 sumshort = ~(u_short)sum1;
964 *(sp) = htons(sumshort);
965 }
966
967
968 /* ------------------------------------------------------------------------ */
969 /* Function: ipf_nat_ioctl */
970 /* Returns: int - 0 == success, != 0 == failure */
971 /* Parameters: softc(I) - pointer to soft context main structure */
972 /* data(I) - pointer to ioctl data */
973 /* cmd(I) - ioctl command integer */
974 /* mode(I) - file mode bits used with open */
975 /* uid(I) - uid of calling process */
976 /* ctx(I) - pointer used as key for finding context */
977 /* */
978 /* Processes an ioctl call made to operate on the IP Filter NAT device. */
979 /* ------------------------------------------------------------------------ */
980 int
981 ipf_nat_ioctl(ipf_main_softc_t *softc, void *data, ioctlcmd_t cmd, int mode,
982 int uid, void *ctx)
983 {
984 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
985 int error = 0, ret, arg, getlock;
986 ipnat_t *nat, *nt, *n;
987 ipnat_t natd;
988 SPL_INT(s);
989
990 #if BSD_GE_YEAR(199306) && defined(_KERNEL)
991 # if NETBSD_GE_REV(399002000)
992 if ((mode & FWRITE) &&
993 kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_FIREWALL,
994 KAUTH_REQ_NETWORK_FIREWALL_FW,
995 NULL, NULL, NULL))
996 # else
997 # if defined(__FreeBSD_version) && (__FreeBSD_version >= 500034)
998 if (securelevel_ge(curthread->td_ucred, 3) && (mode & FWRITE))
999 # else
1000 if ((securelevel >= 3) && (mode & FWRITE))
1001 # endif
1002 # endif
1003 {
1004 IPFERROR(60001);
1005 return EPERM;
1006 }
1007 #endif
1008
1009 #if defined(__osf__) && defined(_KERNEL)
1010 getlock = 0;
1011 #else
1012 getlock = (mode & NAT_LOCKHELD) ? 0 : 1;
1013 #endif
1014
1015 n = NULL;
1016 nt = NULL;
1017 nat = NULL;
1018
1019 if ((cmd == (ioctlcmd_t)SIOCADNAT) || (cmd == (ioctlcmd_t)SIOCRMNAT) ||
1020 (cmd == (ioctlcmd_t)SIOCPURGENAT)) {
1021 if (mode & NAT_SYSSPACE) {
1022 bcopy(data, (char *)&natd, sizeof(natd));
1023 nat = &natd;
1024 error = 0;
1025 } else {
1026 bzero(&natd, sizeof(natd));
1027 error = ipf_inobj(softc, data, NULL, &natd,
1028 IPFOBJ_IPNAT);
1029 if (error != 0)
1030 goto done;
1031
1032 if (natd.in_size < sizeof(ipnat_t)) {
1033 error = EINVAL;
1034 goto done;
1035 }
1036 KMALLOCS(nt, ipnat_t *, natd.in_size);
1037 if (nt == NULL) {
1038 IPFERROR(60070);
1039 error = ENOMEM;
1040 goto done;
1041 }
1042 bzero(nt, natd.in_size);
1043 error = ipf_inobjsz(softc, data, nt, IPFOBJ_IPNAT,
1044 natd.in_size);
1045 if (error)
1046 goto done;
1047 nat = nt;
1048 }
1049
1050 /*
1051 * For add/delete, look to see if the NAT entry is
1052 * already present
1053 */
1054 nat->in_flags &= IPN_USERFLAGS;
1055 if ((nat->in_redir & NAT_MAPBLK) == 0) {
1056 if (nat->in_osrcatype == FRI_NORMAL ||
1057 nat->in_osrcatype == FRI_NONE)
1058 nat->in_osrcaddr &= nat->in_osrcmsk;
1059 if (nat->in_odstatype == FRI_NORMAL ||
1060 nat->in_odstatype == FRI_NONE)
1061 nat->in_odstaddr &= nat->in_odstmsk;
1062 if ((nat->in_flags & (IPN_SPLIT|IPN_SIPRANGE)) == 0) {
1063 if (nat->in_nsrcatype == FRI_NORMAL)
1064 nat->in_nsrcaddr &= nat->in_nsrcmsk;
1065 if (nat->in_ndstatype == FRI_NORMAL)
1066 nat->in_ndstaddr &= nat->in_ndstmsk;
1067 }
1068 }
1069
1070 error = ipf_nat_rule_init(softc, softn, nat);
1071 if (error != 0)
1072 goto done;
1073
1074 MUTEX_ENTER(&softn->ipf_nat_io);
1075 for (n = softn->ipf_nat_list; n != NULL; n = n->in_next)
1076 if (ipf_nat_cmp_rules(nat, n) == 0)
1077 break;
1078 }
1079
1080 switch (cmd)
1081 {
1082 #ifdef IPFILTER_LOG
1083 case SIOCIPFFB :
1084 {
1085 int tmp;
1086
1087 if (!(mode & FWRITE)) {
1088 IPFERROR(60002);
1089 error = EPERM;
1090 } else {
1091 tmp = ipf_log_clear(softc, IPL_LOGNAT);
1092 error = BCOPYOUT(&tmp, data, sizeof(tmp));
1093 if (error != 0) {
1094 IPFERROR(60057);
1095 error = EFAULT;
1096 }
1097 }
1098 break;
1099 }
1100
1101 case SIOCSETLG :
1102 if (!(mode & FWRITE)) {
1103 IPFERROR(60003);
1104 error = EPERM;
1105 } else {
1106 error = BCOPYIN(data, &softn->ipf_nat_logging,
1107 sizeof(softn->ipf_nat_logging));
1108 if (error != 0)
1109 error = EFAULT;
1110 }
1111 break;
1112
1113 case SIOCGETLG :
1114 error = BCOPYOUT(&softn->ipf_nat_logging, data,
1115 sizeof(softn->ipf_nat_logging));
1116 if (error != 0) {
1117 IPFERROR(60004);
1118 error = EFAULT;
1119 }
1120 break;
1121
1122 case FIONREAD :
1123 arg = ipf_log_bytesused(softc, IPL_LOGNAT);
1124 error = BCOPYOUT(&arg, data, sizeof(arg));
1125 if (error != 0) {
1126 IPFERROR(60005);
1127 error = EFAULT;
1128 }
1129 break;
1130 #endif
1131 case SIOCADNAT :
1132 if (!(mode & FWRITE)) {
1133 IPFERROR(60006);
1134 error = EPERM;
1135 } else if (n != NULL) {
1136 natd.in_flineno = n->in_flineno;
1137 (void) ipf_outobj(softc, data, &natd, IPFOBJ_IPNAT);
1138 IPFERROR(60007);
1139 error = EEXIST;
1140 } else if (nt == NULL) {
1141 IPFERROR(60008);
1142 error = ENOMEM;
1143 }
1144 if (error != 0) {
1145 MUTEX_EXIT(&softn->ipf_nat_io);
1146 break;
1147 }
1148 if (nat != nt)
1149 bcopy((char *)nat, (char *)nt, sizeof(*n));
1150 error = ipf_nat_siocaddnat(softc, softn, nt, getlock);
1151 MUTEX_EXIT(&softn->ipf_nat_io);
1152 if (error == 0) {
1153 nat = NULL;
1154 nt = NULL;
1155 }
1156 break;
1157
1158 case SIOCRMNAT :
1159 case SIOCPURGENAT :
1160 if (!(mode & FWRITE)) {
1161 IPFERROR(60009);
1162 error = EPERM;
1163 n = NULL;
1164 } else if (n == NULL) {
1165 IPFERROR(60010);
1166 error = ESRCH;
1167 }
1168
1169 if (error != 0) {
1170 MUTEX_EXIT(&softn->ipf_nat_io);
1171 break;
1172 }
1173 if (cmd == (ioctlcmd_t)SIOCPURGENAT) {
1174 error = ipf_outobjsz(softc, data, n, IPFOBJ_IPNAT,
1175 n->in_size);
1176 if (error) {
1177 MUTEX_EXIT(&softn->ipf_nat_io);
1178 goto done;
1179 }
1180 n->in_flags |= IPN_PURGE;
1181 }
1182 ipf_nat_siocdelnat(softc, softn, n, getlock);
1183
1184 MUTEX_EXIT(&softn->ipf_nat_io);
1185 n = NULL;
1186 break;
1187
1188 case SIOCGNATS :
1189 {
1190 natstat_t *nsp = &softn->ipf_nat_stats;
1191
1192 nsp->ns_side[0].ns_table = softn->ipf_nat_table[0];
1193 nsp->ns_side[1].ns_table = softn->ipf_nat_table[1];
1194 nsp->ns_list = softn->ipf_nat_list;
1195 nsp->ns_maptable = softn->ipf_hm_maptable;
1196 nsp->ns_maplist = softn->ipf_hm_maplist;
1197 nsp->ns_nattab_sz = softn->ipf_nat_table_sz;
1198 nsp->ns_nattab_max = softn->ipf_nat_table_max;
1199 nsp->ns_rultab_sz = softn->ipf_nat_maprules_sz;
1200 nsp->ns_rdrtab_sz = softn->ipf_nat_rdrrules_sz;
1201 nsp->ns_hostmap_sz = softn->ipf_nat_hostmap_sz;
1202 nsp->ns_instances = softn->ipf_nat_instances;
1203 nsp->ns_ticks = softc->ipf_ticks;
1204 #ifdef IPFILTER_LOGGING
1205 nsp->ns_log_ok = ipf_log_logok(softc, IPF_LOGNAT);
1206 nsp->ns_log_fail = ipf_log_failures(softc, IPF_LOGNAT);
1207 #else
1208 nsp->ns_log_ok = 0;
1209 nsp->ns_log_fail = 0;
1210 #endif
1211 error = ipf_outobj(softc, data, nsp, IPFOBJ_NATSTAT);
1212 break;
1213 }
1214
1215 case SIOCGNATL :
1216 {
1217 natlookup_t nl;
1218
1219 error = ipf_inobj(softc, data, NULL, &nl, IPFOBJ_NATLOOKUP);
1220 if (error == 0) {
1221 void *ptr;
1222
1223 if (getlock) {
1224 READ_ENTER(&softc->ipf_nat);
1225 }
1226
1227 switch (nl.nl_v)
1228 {
1229 case 4 :
1230 ptr = ipf_nat_lookupredir(&nl);
1231 break;
1232 #ifdef USE_INET6
1233 case 6 :
1234 ptr = ipf_nat6_lookupredir(&nl);
1235 break;
1236 #endif
1237 default:
1238 ptr = NULL;
1239 break;
1240 }
1241
1242 if (getlock) {
1243 RWLOCK_EXIT(&softc->ipf_nat);
1244 }
1245 if (ptr != NULL) {
1246 error = ipf_outobj(softc, data, &nl,
1247 IPFOBJ_NATLOOKUP);
1248 } else {
1249 IPFERROR(60011);
1250 error = ESRCH;
1251 }
1252 }
1253 break;
1254 }
1255
1256 case SIOCIPFFL : /* old SIOCFLNAT & SIOCCNATL */
1257 if (!(mode & FWRITE)) {
1258 IPFERROR(60012);
1259 error = EPERM;
1260 break;
1261 }
1262 if (getlock) {
1263 WRITE_ENTER(&softc->ipf_nat);
1264 }
1265
1266 error = BCOPYIN(data, &arg, sizeof(arg));
1267 if (error != 0) {
1268 IPFERROR(60013);
1269 error = EFAULT;
1270 } else {
1271 if (arg == 0)
1272 ret = ipf_nat_flushtable(softc, softn);
1273 else if (arg == 1)
1274 ret = ipf_nat_clearlist(softc, softn);
1275 else
1276 ret = ipf_nat_extraflush(softc, softn, arg);
1277 ipf_proxy_flush(softc->ipf_proxy_soft, arg);
1278 }
1279
1280 if (getlock) {
1281 RWLOCK_EXIT(&softc->ipf_nat);
1282 }
1283 if (error == 0) {
1284 error = BCOPYOUT(&ret, data, sizeof(ret));
1285 }
1286 break;
1287
1288 case SIOCMATCHFLUSH :
1289 if (!(mode & FWRITE)) {
1290 IPFERROR(60014);
1291 error = EPERM;
1292 break;
1293 }
1294 if (getlock) {
1295 WRITE_ENTER(&softc->ipf_nat);
1296 }
1297
1298 error = ipf_nat_matchflush(softc, softn, data);
1299
1300 if (getlock) {
1301 RWLOCK_EXIT(&softc->ipf_nat);
1302 }
1303 break;
1304
1305 case SIOCPROXY :
1306 error = ipf_proxy_ioctl(softc, data, cmd, mode, ctx);
1307 break;
1308
1309 case SIOCSTLCK :
1310 if (!(mode & FWRITE)) {
1311 IPFERROR(60015);
1312 error = EPERM;
1313 } else {
1314 error = ipf_lock(data, &softn->ipf_nat_lock);
1315 }
1316 break;
1317
1318 case SIOCSTPUT :
1319 if ((mode & FWRITE) != 0) {
1320 error = ipf_nat_putent(softc, data, getlock);
1321 } else {
1322 IPFERROR(60016);
1323 error = EACCES;
1324 }
1325 break;
1326
1327 case SIOCSTGSZ :
1328 if (softn->ipf_nat_lock) {
1329 error = ipf_nat_getsz(softc, data, getlock);
1330 } else {
1331 IPFERROR(60017);
1332 error = EACCES;
1333 }
1334 break;
1335
1336 case SIOCSTGET :
1337 if (softn->ipf_nat_lock) {
1338 error = ipf_nat_getent(softc, data, getlock);
1339 } else {
1340 IPFERROR(60018);
1341 error = EACCES;
1342 }
1343 break;
1344
1345 case SIOCGENITER :
1346 {
1347 ipfgeniter_t iter;
1348 ipftoken_t *token;
1349 ipfobj_t obj;
1350
1351 error = ipf_inobj(softc, data, &obj, &iter, IPFOBJ_GENITER);
1352 if (error != 0)
1353 break;
1354
1355 SPL_SCHED(s);
1356 token = ipf_token_find(softc, iter.igi_type, uid, ctx);
1357 if (token != NULL) {
1358 error = ipf_nat_iterator(softc, token, &iter, &obj);
1359 WRITE_ENTER(&softc->ipf_tokens);
1360 ipf_token_deref(softc, token);
1361 RWLOCK_EXIT(&softc->ipf_tokens);
1362 }
1363 SPL_X(s);
1364 break;
1365 }
1366
1367 case SIOCIPFDELTOK :
1368 error = BCOPYIN(data, &arg, sizeof(arg));
1369 if (error == 0) {
1370 SPL_SCHED(s);
1371 error = ipf_token_del(softc, arg, uid, ctx);
1372 SPL_X(s);
1373 } else {
1374 IPFERROR(60019);
1375 error = EFAULT;
1376 }
1377 break;
1378
1379 case SIOCGTQTAB :
1380 error = ipf_outobj(softc, data, softn->ipf_nat_tcptq,
1381 IPFOBJ_STATETQTAB);
1382 break;
1383
1384 case SIOCGTABL :
1385 error = ipf_nat_gettable(softc, softn, data);
1386 break;
1387
1388 default :
1389 IPFERROR(60020);
1390 error = EINVAL;
1391 break;
1392 }
1393 done:
1394 if (nat != NULL)
1395 ipf_nat_rule_fini(softc, nat);
1396 if (nt != NULL)
1397 KFREES(nt, nt->in_size);
1398 return error;
1399 }
1400
1401
1402 /* ------------------------------------------------------------------------ */
1403 /* Function: ipf_nat_siocaddnat */
1404 /* Returns: int - 0 == success, != 0 == failure */
1405 /* Parameters: softc(I) - pointer to soft context main structure */
1406 /* softn(I) - pointer to NAT context structure */
1407 /* n(I) - pointer to new NAT rule */
1408 /* np(I) - pointer to where to insert new NAT rule */
1409 /* getlock(I) - flag indicating if lock on is held */
1410 /* Mutex Locks: ipf_nat_io */
1411 /* */
1412 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */
1413 /* from information passed to the kernel, then add it to the appropriate */
1414 /* NAT rule table(s). */
1415 /* ------------------------------------------------------------------------ */
1416 static int
1417 ipf_nat_siocaddnat(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n,
1418 int getlock)
1419 {
1420 int error = 0;
1421
1422 if (ipf_nat_resolverule(softc, n) != 0) {
1423 IPFERROR(60022);
1424 return ENOENT;
1425 }
1426
1427 if ((n->in_age[0] == 0) && (n->in_age[1] != 0)) {
1428 IPFERROR(60023);
1429 return EINVAL;
1430 }
1431
1432 if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) {
1433 /*
1434 * Prerecord whether or not the destination of the divert
1435 * is local or not to the interface the packet is going
1436 * to be sent out.
1437 */
1438 n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1],
1439 n->in_ifps[1], &n->in_ndstip6);
1440 }
1441
1442 if (getlock) {
1443 WRITE_ENTER(&softc->ipf_nat);
1444 }
1445 n->in_next = NULL;
1446 n->in_pnext = softn->ipf_nat_list_tail;
1447 *n->in_pnext = n;
1448 softn->ipf_nat_list_tail = &n->in_next;
1449 n->in_use++;
1450
1451 if (n->in_redir & NAT_REDIRECT) {
1452 n->in_flags &= ~IPN_NOTDST;
1453 switch (n->in_v[0])
1454 {
1455 case 4 :
1456 ipf_nat_addrdr(softn, n);
1457 break;
1458 #ifdef USE_INET6
1459 case 6 :
1460 ipf_nat6_addrdr(softn, n);
1461 break;
1462 #endif
1463 default :
1464 break;
1465 }
1466 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_rdr);
1467 }
1468
1469 if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) {
1470 n->in_flags &= ~IPN_NOTSRC;
1471 switch (n->in_v[0])
1472 {
1473 case 4 :
1474 ipf_nat_addmap(softn, n);
1475 break;
1476 #ifdef USE_INET6
1477 case 6 :
1478 ipf_nat6_addmap(softn, n);
1479 break;
1480 #endif
1481 default :
1482 break;
1483 }
1484 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_map);
1485 }
1486
1487 if (n->in_age[0] != 0)
1488 n->in_tqehead[0] = ipf_addtimeoutqueue(softc,
1489 &softn->ipf_nat_utqe,
1490 n->in_age[0]);
1491
1492 if (n->in_age[1] != 0)
1493 n->in_tqehead[1] = ipf_addtimeoutqueue(softc,
1494 &softn->ipf_nat_utqe,
1495 n->in_age[1]);
1496
1497 MUTEX_INIT(&n->in_lock, "ipnat rule lock");
1498
1499 n = NULL;
1500 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules);
1501 #if SOLARIS && !defined(INSTANCES)
1502 pfil_delayed_copy = 0;
1503 #endif
1504 if (getlock) {
1505 RWLOCK_EXIT(&softc->ipf_nat); /* WRITE */
1506 }
1507
1508 return error;
1509 }
1510
1511
1512 /* ------------------------------------------------------------------------ */
1513 /* Function: ipf_nat_ruleaddrinit */
1514 /* Parameters: softc(I) - pointer to soft context main structure */
1515 /* softn(I) - pointer to NAT context structure */
1516 /* n(I) - pointer to NAT rule */
1517 /* */
1518 /* Initialise all of the NAT address structures in a NAT rule. */
1519 /* ------------------------------------------------------------------------ */
1520 static int
1521 ipf_nat_ruleaddrinit(ipf_main_softc_t *softc, ipf_nat_softc_t *softn,
1522 ipnat_t *n)
1523 {
1524 int idx, error;
1525
1526 if ((n->in_ndst.na_atype == FRI_LOOKUP) &&
1527 (n->in_ndst.na_type != IPLT_DSTLIST)) {
1528 IPFERROR(60071);
1529 return EINVAL;
1530 }
1531 if ((n->in_nsrc.na_atype == FRI_LOOKUP) &&
1532 (n->in_nsrc.na_type != IPLT_DSTLIST)) {
1533 IPFERROR(60069);
1534 return EINVAL;
1535 }
1536
1537 if (n->in_redir == NAT_BIMAP) {
1538 n->in_ndstaddr = n->in_osrcaddr;
1539 n->in_ndstmsk = n->in_osrcmsk;
1540 n->in_odstaddr = n->in_nsrcaddr;
1541 n->in_odstmsk = n->in_nsrcmsk;
1542
1543 }
1544
1545 if (n->in_redir & NAT_REDIRECT)
1546 idx = 1;
1547 else
1548 idx = 0;
1549 /*
1550 * Initialise all of the address fields.
1551 */
1552 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc, 1,
1553 n->in_ifps[idx]);
1554 if (error != 0)
1555 return error;
1556
1557 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst, 1,
1558 n->in_ifps[idx]);
1559 if (error != 0)
1560 return error;
1561
1562 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc, 1,
1563 n->in_ifps[idx]);
1564 if (error != 0)
1565 return error;
1566
1567 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst, 1,
1568 n->in_ifps[idx]);
1569 if (error != 0)
1570 return error;
1571
1572 if (n->in_redir & NAT_DIVERTUDP)
1573 ipf_nat_builddivertmp(softn, n);
1574
1575 return 0;
1576 }
1577
1578
1579 /* ------------------------------------------------------------------------ */
1580 /* Function: ipf_nat_resolvrule */
1581 /* Returns: Nil */
1582 /* Parameters: softc(I) - pointer to soft context main structure */
1583 /* n(I) - pointer to NAT rule */
1584 /* */
1585 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */
1586 /* from information passed to the kernel, then add it to the appropriate */
1587 /* NAT rule table(s). */
1588 /* ------------------------------------------------------------------------ */
1589 static int
1590 ipf_nat_resolverule(ipf_main_softc_t *softc, ipnat_t *n)
1591 {
1592 char *base;
1593
1594 base = n->in_names;
1595
1596 n->in_ifps[0] = ipf_resolvenic(softc, base + n->in_ifnames[0],
1597 n->in_v[0]);
1598
1599 if (n->in_ifnames[1] == -1) {
1600 n->in_ifnames[1] = n->in_ifnames[0];
1601 n->in_ifps[1] = n->in_ifps[0];
1602 } else {
1603 n->in_ifps[1] = ipf_resolvenic(softc, base + n->in_ifnames[1],
1604 n->in_v[1]);
1605 }
1606
1607 if (n->in_plabel != -1) {
1608 if (n->in_redir & NAT_REDIRECT)
1609 n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft,
1610 n->in_pr[0],
1611 base + n->in_plabel);
1612 else
1613 n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft,
1614 n->in_pr[1],
1615 base + n->in_plabel);
1616 if (n->in_apr == NULL)
1617 return -1;
1618 }
1619 return 0;
1620 }
1621
1622
1623 /* ------------------------------------------------------------------------ */
1624 /* Function: ipf_nat_siocdelnat */
1625 /* Returns: int - 0 == success, != 0 == failure */
1626 /* Parameters: softc(I) - pointer to soft context main structure */
1627 /* softn(I) - pointer to NAT context structure */
1628 /* n(I) - pointer to new NAT rule */
1629 /* getlock(I) - flag indicating if lock on is held */
1630 /* Mutex Locks: ipf_nat_io */
1631 /* */
1632 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */
1633 /* from information passed to the kernel, then add it to the appropriate */
1634 /* NAT rule table(s). */
1635 /* ------------------------------------------------------------------------ */
1636 static void
1637 ipf_nat_siocdelnat(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n,
1638 int getlock)
1639 {
1640 #ifdef IPF_NAT6
1641 int i;
1642 #endif
1643
1644 if (getlock) {
1645 WRITE_ENTER(&softc->ipf_nat);
1646 }
1647
1648 ipf_nat_delrule(softc, softn, n, 1);
1649
1650 if (getlock) {
1651 RWLOCK_EXIT(&softc->ipf_nat); /* READ/WRITE */
1652 }
1653 }
1654
1655
1656 /* ------------------------------------------------------------------------ */
1657 /* Function: ipf_nat_getsz */
1658 /* Returns: int - 0 == success, != 0 is the error value. */
1659 /* Parameters: softc(I) - pointer to soft context main structure */
1660 /* data(I) - pointer to natget structure with kernel */
1661 /* pointer get the size of. */
1662 /* getlock(I) - flag indicating whether or not the caller */
1663 /* holds a lock on ipf_nat */
1664 /* */
1665 /* Handle SIOCSTGSZ. */
1666 /* Return the size of the nat list entry to be copied back to user space. */
1667 /* The size of the entry is stored in the ng_sz field and the enture natget */
1668 /* structure is copied back to the user. */
1669 /* ------------------------------------------------------------------------ */
1670 static int
1671 ipf_nat_getsz(ipf_main_softc_t *softc, void *data, int getlock)
1672 {
1673 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
1674 ap_session_t *aps;
1675 nat_t *nat, *n;
1676 natget_t ng;
1677 int error;
1678
1679 error = BCOPYIN(data, &ng, sizeof(ng));
1680 if (error != 0) {
1681 IPFERROR(60024);
1682 return EFAULT;
1683 }
1684
1685 if (getlock) {
1686 READ_ENTER(&softc->ipf_nat);
1687 }
1688
1689 nat = ng.ng_ptr;
1690 if (!nat) {
1691 nat = softn->ipf_nat_instances;
1692 ng.ng_sz = 0;
1693 /*
1694 * Empty list so the size returned is 0. Simple.
1695 */
1696 if (nat == NULL) {
1697 if (getlock) {
1698 RWLOCK_EXIT(&softc->ipf_nat);
1699 }
1700 error = BCOPYOUT(&ng, data, sizeof(ng));
1701 if (error != 0) {
1702 IPFERROR(60025);
1703 return EFAULT;
1704 }
1705 return 0;
1706 }
1707 } else {
1708 /*
1709 * Make sure the pointer we're copying from exists in the
1710 * current list of entries. Security precaution to prevent
1711 * copying of random kernel data.
1712 */
1713 for (n = softn->ipf_nat_instances; n; n = n->nat_next)
1714 if (n == nat)
1715 break;
1716 if (n == NULL) {
1717 if (getlock) {
1718 RWLOCK_EXIT(&softc->ipf_nat);
1719 }
1720 IPFERROR(60026);
1721 return ESRCH;
1722 }
1723 }
1724
1725 /*
1726 * Incluse any space required for proxy data structures.
1727 */
1728 ng.ng_sz = sizeof(nat_save_t);
1729 aps = nat->nat_aps;
1730 if (aps != NULL) {
1731 ng.ng_sz += sizeof(ap_session_t) - 4;
1732 if (aps->aps_data != 0)
1733 ng.ng_sz += aps->aps_psiz;
1734 }
1735 if (getlock) {
1736 RWLOCK_EXIT(&softc->ipf_nat);
1737 }
1738
1739 error = BCOPYOUT(&ng, data, sizeof(ng));
1740 if (error != 0) {
1741 IPFERROR(60027);
1742 return EFAULT;
1743 }
1744 return 0;
1745 }
1746
1747
1748 /* ------------------------------------------------------------------------ */
1749 /* Function: ipf_nat_getent */
1750 /* Returns: int - 0 == success, != 0 is the error value. */
1751 /* Parameters: softc(I) - pointer to soft context main structure */
1752 /* data(I) - pointer to natget structure with kernel pointer*/
1753 /* to NAT structure to copy out. */
1754 /* getlock(I) - flag indicating whether or not the caller */
1755 /* holds a lock on ipf_nat */
1756 /* */
1757 /* Handle SIOCSTGET. */
1758 /* Copies out NAT entry to user space. Any additional data held for a */
1759 /* proxy is also copied, as to is the NAT rule which was responsible for it */
1760 /* ------------------------------------------------------------------------ */
1761 static int
1762 ipf_nat_getent(ipf_main_softc_t *softc, void *data, int getlock)
1763 {
1764 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
1765 int error, outsize;
1766 ap_session_t *aps;
1767 nat_save_t *ipn, ipns;
1768 nat_t *n, *nat;
1769
1770 error = ipf_inobj(softc, data, NULL, &ipns, IPFOBJ_NATSAVE);
1771 if (error != 0)
1772 return error;
1773
1774 if ((ipns.ipn_dsize < sizeof(ipns)) || (ipns.ipn_dsize > 81920)) {
1775 IPFERROR(60028);
1776 return EINVAL;
1777 }
1778
1779 KMALLOCS(ipn, nat_save_t *, ipns.ipn_dsize);
1780 if (ipn == NULL) {
1781 IPFERROR(60029);
1782 return ENOMEM;
1783 }
1784
1785 if (getlock) {
1786 READ_ENTER(&softc->ipf_nat);
1787 }
1788
1789 ipn->ipn_dsize = ipns.ipn_dsize;
1790 nat = ipns.ipn_next;
1791 if (nat == NULL) {
1792 nat = softn->ipf_nat_instances;
1793 if (nat == NULL) {
1794 if (softn->ipf_nat_instances == NULL) {
1795 IPFERROR(60030);
1796 error = ENOENT;
1797 }
1798 goto finished;
1799 }
1800 } else {
1801 /*
1802 * Make sure the pointer we're copying from exists in the
1803 * current list of entries. Security precaution to prevent
1804 * copying of random kernel data.
1805 */
1806 for (n = softn->ipf_nat_instances; n; n = n->nat_next)
1807 if (n == nat)
1808 break;
1809 if (n == NULL) {
1810 IPFERROR(60031);
1811 error = ESRCH;
1812 goto finished;
1813 }
1814 }
1815 ipn->ipn_next = nat->nat_next;
1816
1817 /*
1818 * Copy the NAT structure.
1819 */
1820 bcopy((char *)nat, &ipn->ipn_nat, sizeof(*nat));
1821
1822 /*
1823 * If we have a pointer to the NAT rule it belongs to, save that too.
1824 */
1825 if (nat->nat_ptr != NULL)
1826 bcopy((char *)nat->nat_ptr, (char *)&ipn->ipn_ipnat,
1827 ipn->ipn_ipnat.in_size);
1828
1829 /*
1830 * If we also know the NAT entry has an associated filter rule,
1831 * save that too.
1832 */
1833 if (nat->nat_fr != NULL)
1834 bcopy((char *)nat->nat_fr, (char *)&ipn->ipn_fr,
1835 sizeof(ipn->ipn_fr));
1836
1837 /*
1838 * Last but not least, if there is an application proxy session set
1839 * up for this NAT entry, then copy that out too, including any
1840 * private data saved along side it by the proxy.
1841 */
1842 aps = nat->nat_aps;
1843 outsize = ipn->ipn_dsize - sizeof(*ipn) + sizeof(ipn->ipn_data);
1844 if (aps != NULL) {
1845 char *s;
1846
1847 if (outsize < sizeof(*aps)) {
1848 IPFERROR(60032);
1849 error = ENOBUFS;
1850 goto finished;
1851 }
1852
1853 s = ipn->ipn_data;
1854 bcopy((char *)aps, s, sizeof(*aps));
1855 s += sizeof(*aps);
1856 outsize -= sizeof(*aps);
1857 if ((aps->aps_data != NULL) && (outsize >= aps->aps_psiz))
1858 bcopy(aps->aps_data, s, aps->aps_psiz);
1859 else {
1860 IPFERROR(60033);
1861 error = ENOBUFS;
1862 }
1863 }
1864 if (error == 0) {
1865 if (getlock) {
1866 READ_ENTER(&softc->ipf_nat);
1867 getlock = 0;
1868 }
1869 error = ipf_outobjsz(softc, data, ipn, IPFOBJ_NATSAVE,
1870 ipns.ipn_dsize);
1871 }
1872
1873 finished:
1874 if (getlock) {
1875 READ_ENTER(&softc->ipf_nat);
1876 }
1877 if (ipn != NULL) {
1878 KFREES(ipn, ipns.ipn_dsize);
1879 }
1880 return error;
1881 }
1882
1883
1884 /* ------------------------------------------------------------------------ */
1885 /* Function: ipf_nat_putent */
1886 /* Returns: int - 0 == success, != 0 is the error value. */
1887 /* Parameters: softc(I) - pointer to soft context main structure */
1888 /* data(I) - pointer to natget structure with NAT */
1889 /* structure information to load into the kernel */
1890 /* getlock(I) - flag indicating whether or not a write lock */
1891 /* on is already held. */
1892 /* */
1893 /* Handle SIOCSTPUT. */
1894 /* Loads a NAT table entry from user space, including a NAT rule, proxy and */
1895 /* firewall rule data structures, if pointers to them indicate so. */
1896 /* ------------------------------------------------------------------------ */
1897 static int
1898 ipf_nat_putent(ipf_main_softc_t *softc, void *data, int getlock)
1899 {
1900 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
1901 nat_save_t *ipn, *ipnn;
1902 ap_session_t *aps;
1903 nat_t *n, *nat;
1904 frentry_t *fr;
1905 fr_info_t *fin;
1906 ipnat_t *in;
1907 int error;
1908
1909 KMALLOC(ipn, nat_save_t *);
1910 if (ipn == NULL)
1911 return ENOMEM;
1912 error = ipf_inobj(softc, data, NULL, ipn, IPFOBJ_NATSAVE);
1913 if (error != 0)
1914 return error;
1915
1916 /*
1917 * Initialise early because of code at junkput label.
1918 */
1919 n = NULL;
1920 in = NULL;
1921 aps = NULL;
1922 nat = NULL;
1923 ipnn = NULL;
1924 fin = NULL;
1925 fr = NULL;
1926
1927 /*
1928 * New entry, copy in the rest of the NAT entry if it's size is more
1929 * than just the nat_t structure.
1930 */
1931 if (ipn->ipn_dsize > sizeof(*ipn)) {
1932 if (ipn->ipn_dsize > 81920) {
1933 IPFERROR(60034);
1934 error = ENOMEM;
1935 goto junkput;
1936 }
1937
1938 KMALLOCS(ipnn, nat_save_t *, ipn->ipn_dsize);
1939 if (ipnn == NULL) {
1940 IPFERROR(60035);
1941 return ENOMEM;
1942 }
1943
1944 bzero(ipnn, ipn->ipn_dsize);
1945 error = ipf_inobjsz(softc, data, ipnn, IPFOBJ_NATSAVE,
1946 ipn->ipn_dsize);
1947 if (error != 0) {
1948 goto junkput;
1949 }
1950 } else
1951 ipnn = ipn;
1952
1953 KMALLOC(nat, nat_t *);
1954 if (nat == NULL) {
1955 IPFERROR(60037);
1956 error = ENOMEM;
1957 goto junkput;
1958 }
1959
1960 bcopy((char *)&ipnn->ipn_nat, (char *)nat, sizeof(*nat));
1961
1962 switch (nat->nat_v[0])
1963 {
1964 case 4:
1965 #ifdef USE_IENT6
1966 case 6 :
1967 #endif
1968 break;
1969 default :
1970 IPFERROR(60061);
1971 error = EPROTONOSUPPORT;
1972 goto junkput;
1973 /*NOTREACHED*/
1974 }
1975
1976 /*
1977 * Initialize all these so that ipf_nat_delete() doesn't cause a crash.
1978 */
1979 bzero((char *)nat, offsetof(struct nat, nat_tqe));
1980 nat->nat_tqe.tqe_pnext = NULL;
1981 nat->nat_tqe.tqe_next = NULL;
1982 nat->nat_tqe.tqe_ifq = NULL;
1983 nat->nat_tqe.tqe_parent = nat;
1984
1985 /*
1986 * Restore the rule associated with this nat session
1987 */
1988 in = ipnn->ipn_nat.nat_ptr;
1989 if (in != NULL) {
1990 KMALLOCS(in, ipnat_t *, ipnn->ipn_ipnat.in_size);
1991 nat->nat_ptr = in;
1992 if (in == NULL) {
1993 IPFERROR(60038);
1994 error = ENOMEM;
1995 goto junkput;
1996 }
1997 bcopy((char *)&ipnn->ipn_ipnat, (char *)in,
1998 ipnn->ipn_ipnat.in_size);
1999 in->in_use = 1;
2000 in->in_flags |= IPN_DELETE;
2001
2002 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules);
2003
2004 if (ipf_nat_resolverule(softc, in) != 0) {
2005 IPFERROR(60039);
2006 error = ESRCH;
2007 goto junkput;
2008 }
2009 }
2010
2011 /*
2012 * Check that the NAT entry doesn't already exist in the kernel.
2013 *
2014 * For NAT_OUTBOUND, we're lookup for a duplicate MAP entry. To do
2015 * this, we check to see if the inbound combination of addresses and
2016 * ports is already known. Similar logic is applied for NAT_INBOUND.
2017 *
2018 */
2019 KMALLOC(fin, fr_info_t *);
2020 if (fin == NULL) {
2021 error = ENOMEM;
2022 goto junkput;
2023 }
2024 bzero(fin, sizeof(*fin));
2025 fin->fin_v = nat->nat_v[0];
2026 fin->fin_p = nat->nat_pr[0];
2027 fin->fin_rev = nat->nat_rev;
2028 fin->fin_ifp = nat->nat_ifps[0];
2029 fin->fin_data[0] = ntohs(nat->nat_ndport);
2030 fin->fin_data[1] = ntohs(nat->nat_nsport);
2031
2032 switch (nat->nat_dir)
2033 {
2034 case NAT_OUTBOUND :
2035 case NAT_DIVERTOUT :
2036 if (getlock) {
2037 READ_ENTER(&softc->ipf_nat);
2038 }
2039
2040 fin->fin_v = nat->nat_v[1];
2041 if (nat->nat_v[1] == 4) {
2042 n = ipf_nat_inlookup(fin, nat->nat_flags, fin->fin_p,
2043 nat->nat_ndstip, nat->nat_nsrcip);
2044 #ifdef USE_INET6
2045 } else if (nat->nat_v[1] == 6) {
2046 n = ipf_nat6_inlookup(fin, nat->nat_flags, fin->fin_p,
2047 &nat->nat_ndst6.in6,
2048 &nat->nat_nsrc6.in6);
2049 #endif
2050 }
2051
2052 if (getlock) {
2053 RWLOCK_EXIT(&softc->ipf_nat);
2054 }
2055 if (n != NULL) {
2056 IPFERROR(60040);
2057 error = EEXIST;
2058 goto junkput;
2059 }
2060 break;
2061
2062 case NAT_INBOUND :
2063 case NAT_DIVERTIN :
2064 if (getlock) {
2065 READ_ENTER(&softc->ipf_nat);
2066 }
2067
2068 if (fin->fin_v == 4) {
2069 n = ipf_nat_outlookup(fin, nat->nat_flags, fin->fin_p,
2070 nat->nat_ndstip,
2071 nat->nat_nsrcip);
2072 #ifdef USE_INET6
2073 } else if (fin->fin_v == 6) {
2074 n = ipf_nat6_outlookup(fin, nat->nat_flags, fin->fin_p,
2075 &nat->nat_ndst6.in6,
2076 &nat->nat_nsrc6.in6);
2077 #endif
2078 }
2079
2080 if (getlock) {
2081 RWLOCK_EXIT(&softc->ipf_nat);
2082 }
2083 if (n != NULL) {
2084 IPFERROR(60041);
2085 error = EEXIST;
2086 goto junkput;
2087 }
2088 break;
2089
2090 default :
2091 IPFERROR(60042);
2092 error = EINVAL;
2093 goto junkput;
2094 }
2095
2096 /*
2097 * Restore ap_session_t structure. Include the private data allocated
2098 * if it was there.
2099 */
2100 aps = nat->nat_aps;
2101 if (aps != NULL) {
2102 KMALLOC(aps, ap_session_t *);
2103 nat->nat_aps = aps;
2104 if (aps == NULL) {
2105 IPFERROR(60043);
2106 error = ENOMEM;
2107 goto junkput;
2108 }
2109 bcopy(ipnn->ipn_data, (char *)aps, sizeof(*aps));
2110 if (in != NULL)
2111 aps->aps_apr = in->in_apr;
2112 else
2113 aps->aps_apr = NULL;
2114 if (aps->aps_psiz != 0) {
2115 if (aps->aps_psiz > 81920) {
2116 IPFERROR(60044);
2117 error = ENOMEM;
2118 goto junkput;
2119 }
2120 KMALLOCS(aps->aps_data, void *, aps->aps_psiz);
2121 if (aps->aps_data == NULL) {
2122 IPFERROR(60045);
2123 error = ENOMEM;
2124 goto junkput;
2125 }
2126 bcopy(ipnn->ipn_data + sizeof(*aps), aps->aps_data,
2127 aps->aps_psiz);
2128 } else {
2129 aps->aps_psiz = 0;
2130 aps->aps_data = NULL;
2131 }
2132 }
2133
2134 /*
2135 * If there was a filtering rule associated with this entry then
2136 * build up a new one.
2137 */
2138 fr = nat->nat_fr;
2139 if (fr != NULL) {
2140 if ((nat->nat_flags & SI_NEWFR) != 0) {
2141 KMALLOC(fr, frentry_t *);
2142 nat->nat_fr = fr;
2143 if (fr == NULL) {
2144 IPFERROR(60046);
2145 error = ENOMEM;
2146 goto junkput;
2147 }
2148 ipnn->ipn_nat.nat_fr = fr;
2149 fr->fr_ref = 1;
2150 (void) ipf_outobj(softc, data, ipnn, IPFOBJ_NATSAVE);
2151 bcopy((char *)&ipnn->ipn_fr, (char *)fr, sizeof(*fr));
2152
2153 fr->fr_ref = 1;
2154 fr->fr_dsize = 0;
2155 fr->fr_data = NULL;
2156 fr->fr_type = FR_T_NONE;
2157
2158 MUTEX_NUKE(&fr->fr_lock);
2159 MUTEX_INIT(&fr->fr_lock, "nat-filter rule lock");
2160 } else {
2161 if (getlock) {
2162 READ_ENTER(&softc->ipf_nat);
2163 }
2164 for (n = softn->ipf_nat_instances; n; n = n->nat_next)
2165 if (n->nat_fr == fr)
2166 break;
2167
2168 if (n != NULL) {
2169 MUTEX_ENTER(&fr->fr_lock);
2170 fr->fr_ref++;
2171 MUTEX_EXIT(&fr->fr_lock);
2172 }
2173 if (getlock) {
2174 RWLOCK_EXIT(&softc->ipf_nat);
2175 }
2176
2177 if (n == NULL) {
2178 IPFERROR(60047);
2179 error = ESRCH;
2180 goto junkput;
2181 }
2182 }
2183 }
2184
2185 if (ipnn != ipn) {
2186 KFREES(ipnn, ipn->ipn_dsize);
2187 ipnn = NULL;
2188 }
2189
2190 if (getlock) {
2191 WRITE_ENTER(&softc->ipf_nat);
2192 }
2193
2194 if (fin->fin_v == 4)
2195 error = ipf_nat_finalise(fin, nat);
2196 #ifdef USE_INET6
2197 else
2198 error = ipf_nat6_finalise(fin, nat);
2199 #endif
2200
2201 if (getlock) {
2202 RWLOCK_EXIT(&softc->ipf_nat);
2203 }
2204
2205 if (error == 0)
2206 return 0;
2207
2208 IPFERROR(60048);
2209 error = ENOMEM;
2210
2211 junkput:
2212 if (fin != NULL)
2213 KFREE(fin);
2214 if (fr != NULL) {
2215 (void) ipf_derefrule(softc, &fr);
2216 }
2217
2218 if ((ipnn != NULL) && (ipnn != ipn)) {
2219 KFREES(ipnn, ipn->ipn_dsize);
2220 }
2221 if (ipn != NULL)
2222 KFREE(ipn);
2223 if (nat != NULL) {
2224 if (aps != NULL) {
2225 if (aps->aps_data != NULL) {
2226 KFREES(aps->aps_data, aps->aps_psiz);
2227 }
2228 KFREE(aps);
2229 }
2230 if (in != NULL) {
2231 if (in->in_apr)
2232 ipf_proxy_deref(in->in_apr);
2233 KFREES(in, in->in_size);
2234 }
2235 KFREE(nat);
2236 }
2237 return error;
2238 }
2239
2240
2241 /* ------------------------------------------------------------------------ */
2242 /* Function: ipf_nat_delete */
2243 /* Returns: Nil */
2244 /* Parameters: softc(I) - pointer to soft context main structure */
2245 /* nat(I) - pointer to NAT structure to delete */
2246 /* logtype(I) - type of LOG record to create before deleting */
2247 /* Write Lock: ipf_nat */
2248 /* */
2249 /* Delete a nat entry from the various lists and table. If NAT logging is */
2250 /* enabled then generate a NAT log record for this event. */
2251 /* ------------------------------------------------------------------------ */
2252 void
2253 ipf_nat_delete(ipf_main_softc_t *softc, struct nat *nat, int logtype)
2254 {
2255 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
2256 int madeorphan = 0, bkt, removed = 0;
2257 nat_stat_side_t *nss;
2258 struct ipnat *ipn;
2259
2260 if (logtype != 0 && softn->ipf_nat_logging != 0)
2261 ipf_nat_log(softc, softn, nat, logtype);
2262
2263 /*
2264 * Take it as a general indication that all the pointers are set if
2265 * nat_pnext is set.
2266 */
2267 if (nat->nat_pnext != NULL) {
2268 removed = 1;
2269
2270 bkt = nat->nat_hv[0] % softn->ipf_nat_table_sz;
2271 nss = &softn->ipf_nat_stats.ns_side[0];
2272 nss->ns_bucketlen[bkt]--;
2273 if (nss->ns_bucketlen[bkt] == 0) {
2274 nss->ns_inuse--;
2275 }
2276
2277 bkt = nat->nat_hv[1] % softn->ipf_nat_table_sz;
2278 nss = &softn->ipf_nat_stats.ns_side[1];
2279 nss->ns_bucketlen[bkt]--;
2280 if (nss->ns_bucketlen[bkt] == 0) {
2281 nss->ns_inuse--;
2282 }
2283
2284 *nat->nat_pnext = nat->nat_next;
2285 if (nat->nat_next != NULL) {
2286 nat->nat_next->nat_pnext = nat->nat_pnext;
2287 nat->nat_next = NULL;
2288 }
2289 nat->nat_pnext = NULL;
2290
2291 *nat->nat_phnext[0] = nat->nat_hnext[0];
2292 if (nat->nat_hnext[0] != NULL) {
2293 nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0];
2294 nat->nat_hnext[0] = NULL;
2295 }
2296 nat->nat_phnext[0] = NULL;
2297
2298 *nat->nat_phnext[1] = nat->nat_hnext[1];
2299 if (nat->nat_hnext[1] != NULL) {
2300 nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1];
2301 nat->nat_hnext[1] = NULL;
2302 }
2303 nat->nat_phnext[1] = NULL;
2304
2305 if ((nat->nat_flags & SI_WILDP) != 0) {
2306 ATOMIC_DEC32(softn->ipf_nat_stats.ns_wilds);
2307 }
2308 madeorphan = 1;
2309 }
2310
2311 if (nat->nat_me != NULL) {
2312 *nat->nat_me = NULL;
2313 nat->nat_me = NULL;
2314 nat->nat_ref--;
2315 ASSERT(nat->nat_ref >= 0);
2316 }
2317
2318 if (nat->nat_tqe.tqe_ifq != NULL) {
2319 /*
2320 * No call to ipf_freetimeoutqueue() is made here, they are
2321 * garbage collected in ipf_nat_expire().
2322 */
2323 (void) ipf_deletequeueentry(&nat->nat_tqe);
2324 }
2325
2326 if (nat->nat_sync) {
2327 ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync);
2328 nat->nat_sync = NULL;
2329 }
2330
2331 if (logtype == NL_EXPIRE)
2332 softn->ipf_nat_stats.ns_expire++;
2333
2334 MUTEX_ENTER(&nat->nat_lock);
2335 /*
2336 * NL_DESTROY should only be passed in when we've got nat_ref >= 2.
2337 * This happens when a nat'd packet is blocked and we want to throw
2338 * away the NAT session.
2339 */
2340 if (logtype == NL_DESTROY) {
2341 if (nat->nat_ref > 2) {
2342 nat->nat_ref -= 2;
2343 MUTEX_EXIT(&nat->nat_lock);
2344 if (removed)
2345 softn->ipf_nat_stats.ns_orphans++;
2346 return;
2347 }
2348 } else if (nat->nat_ref > 1) {
2349 nat->nat_ref--;
2350 MUTEX_EXIT(&nat->nat_lock);
2351 if (madeorphan == 1)
2352 softn->ipf_nat_stats.ns_orphans++;
2353 return;
2354 }
2355 ASSERT(nat->nat_ref >= 0);
2356 MUTEX_EXIT(&nat->nat_lock);
2357
2358 nat->nat_ref = 0;
2359
2360 if (madeorphan == 0)
2361 softn->ipf_nat_stats.ns_orphans--;
2362
2363 /*
2364 * At this point, nat_ref can be either 0 or -1
2365 */
2366 softn->ipf_nat_stats.ns_proto[nat->nat_pr[0]]--;
2367
2368 if (nat->nat_fr != NULL) {
2369 (void) ipf_derefrule(softc, &nat->nat_fr);
2370 }
2371
2372 if (nat->nat_hm != NULL) {
2373 ipf_nat_hostmapdel(softc, &nat->nat_hm);
2374 }
2375
2376 /*
2377 * If there is an active reference from the nat entry to its parent
2378 * rule, decrement the rule's reference count and free it too if no
2379 * longer being used.
2380 */
2381 ipn = nat->nat_ptr;
2382 nat->nat_ptr = NULL;
2383
2384 if (ipn != NULL) {
2385 ipn->in_space++;
2386 ipf_nat_rule_deref(softc, &ipn);
2387 }
2388
2389 if (nat->nat_aps != NULL) {
2390 ipf_proxy_free(softc, nat->nat_aps);
2391 nat->nat_aps = NULL;
2392 }
2393
2394 MUTEX_DESTROY(&nat->nat_lock);
2395
2396 softn->ipf_nat_stats.ns_active--;
2397
2398 /*
2399 * If there's a fragment table entry too for this nat entry, then
2400 * dereference that as well. This is after nat_lock is released
2401 * because of Tru64.
2402 */
2403 ipf_frag_natforget(softc, (void *)nat);
2404
2405 KFREE(nat);
2406 }
2407
2408
2409 /* ------------------------------------------------------------------------ */
2410 /* Function: ipf_nat_flushtable */
2411 /* Returns: int - number of NAT rules deleted */
2412 /* Parameters: softc(I) - pointer to soft context main structure */
2413 /* softn(I) - pointer to NAT context structure */
2414 /* Write Lock: ipf_nat */
2415 /* */
2416 /* Deletes all currently active NAT sessions. In deleting each NAT entry a */
2417 /* log record should be emitted in ipf_nat_delete() if NAT logging is */
2418 /* enabled. */
2419 /* ------------------------------------------------------------------------ */
2420 /*
2421 * nat_flushtable - clear the NAT table of all mapping entries.
2422 */
2423 static int
2424 ipf_nat_flushtable(ipf_main_softc_t *softc, ipf_nat_softc_t *softn)
2425 {
2426 nat_t *nat;
2427 int j = 0;
2428
2429 /*
2430 * ALL NAT mappings deleted, so lets just make the deletions
2431 * quicker.
2432 */
2433 if (softn->ipf_nat_table[0] != NULL)
2434 bzero((char *)softn->ipf_nat_table[0],
2435 sizeof(softn->ipf_nat_table[0]) *
2436 softn->ipf_nat_table_sz);
2437 if (softn->ipf_nat_table[1] != NULL)
2438 bzero((char *)softn->ipf_nat_table[1],
2439 sizeof(softn->ipf_nat_table[1]) *
2440 softn->ipf_nat_table_sz);
2441
2442 while ((nat = softn->ipf_nat_instances) != NULL) {
2443 ipf_nat_delete(softc, nat, NL_FLUSH);
2444 j++;
2445 }
2446
2447 return j;
2448 }
2449
2450
2451 /* ------------------------------------------------------------------------ */
2452 /* Function: ipf_nat_clearlist */
2453 /* Returns: int - number of NAT/RDR rules deleted */
2454 /* Parameters: softc(I) - pointer to soft context main structure */
2455 /* softn(I) - pointer to NAT context structure */
2456 /* */
2457 /* Delete all rules in the current list of rules. There is nothing elegant */
2458 /* about this cleanup: simply free all entries on the list of rules and */
2459 /* clear out the tables used for hashed NAT rule lookups. */
2460 /* ------------------------------------------------------------------------ */
2461 static int
2462 ipf_nat_clearlist(ipf_main_softc_t *softc, ipf_nat_softc_t *softn)
2463 {
2464 ipnat_t *n;
2465 int i = 0;
2466
2467 if (softn->ipf_nat_map_rules != NULL) {
2468 bzero((char *)softn->ipf_nat_map_rules,
2469 sizeof(*softn->ipf_nat_map_rules) *
2470 softn->ipf_nat_maprules_sz);
2471 }
2472 if (softn->ipf_nat_rdr_rules != NULL) {
2473 bzero((char *)softn->ipf_nat_rdr_rules,
2474 sizeof(*softn->ipf_nat_rdr_rules) *
2475 softn->ipf_nat_rdrrules_sz);
2476 }
2477
2478 while ((n = softn->ipf_nat_list) != NULL) {
2479 ipf_nat_delrule(softc, softn, n, 0);
2480 i++;
2481 }
2482 #if SOLARIS && !defined(INSTANCES)
2483 pfil_delayed_copy = 1;
2484 #endif
2485 return i;
2486 }
2487
2488
2489 /* ------------------------------------------------------------------------ */
2490 /* Function: ipf_nat_delrule */
2491 /* Returns: Nil */
2492 /* Parameters: softc(I) - pointer to soft context main structure */
2493 /* softn(I) - pointer to NAT context structure */
2494 /* np(I) - pointer to NAT rule to delete */
2495 /* purge(I) - 1 == allow purge, 0 == prevent purge */
2496 /* Locks: WRITE(ipf_nat) */
2497 /* */
2498 /* Preventing "purge" from occuring is allowed because when all of the NAT */
2499 /* rules are being removed, allowing the "purge" to walk through the list */
2500 /* of NAT sessions, possibly multiple times, would be a large performance */
2501 /* hit, on the order of O(N^2). */
2502 /* ------------------------------------------------------------------------ */
2503 static void
2504 ipf_nat_delrule(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *np,
2505 int purge)
2506 {
2507
2508 if (np->in_pnext != NULL) {
2509 *np->in_pnext = np->in_next;
2510 if (np->in_next != NULL)
2511 np->in_next->in_pnext = np->in_pnext;
2512 if (softn->ipf_nat_list_tail == &np->in_next)
2513 softn->ipf_nat_list_tail = np->in_pnext;
2514 }
2515
2516 if ((purge == 1) && ((np->in_flags & IPN_PURGE) != 0)) {
2517 nat_t *next;
2518 nat_t *nat;
2519
2520 for (next = softn->ipf_nat_instances; (nat = next) != NULL;) {
2521 next = nat->nat_next;
2522 if (nat->nat_ptr == np)
2523 ipf_nat_delete(softc, nat, NL_PURGE);
2524 }
2525 }
2526
2527 if ((np->in_flags & IPN_DELETE) == 0) {
2528 if (np->in_redir & NAT_REDIRECT) {
2529 switch (np->in_v[0])
2530 {
2531 case 4 :
2532 ipf_nat_delrdr(softn, np);
2533 break;
2534 #ifdef USE_INET6
2535 case 6 :
2536 ipf_nat6_delrdr(softn, np);
2537 break;
2538 #endif
2539 }
2540 }
2541 if (np->in_redir & (NAT_MAPBLK|NAT_MAP)) {
2542 switch (np->in_v[0])
2543 {
2544 case 4 :
2545 ipf_nat_delmap(softn, np);
2546 break;
2547 #ifdef USE_INET6
2548 case 6 :
2549 ipf_nat6_delmap(softn, np);
2550 break;
2551 #endif
2552 }
2553 }
2554 }
2555
2556 np->in_flags |= IPN_DELETE;
2557 ipf_nat_rule_deref(softc, &np);
2558 }
2559
2560
2561 /* ------------------------------------------------------------------------ */
2562 /* Function: ipf_nat_newmap */
2563 /* Returns: int - -1 == error, 0 == success */
2564 /* Parameters: fin(I) - pointer to packet information */
2565 /* nat(I) - pointer to NAT entry */
2566 /* ni(I) - pointer to structure with misc. information needed */
2567 /* to create new NAT entry. */
2568 /* */
2569 /* Given an empty NAT structure, populate it with new information about a */
2570 /* new NAT session, as defined by the matching NAT rule. */
2571 /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/
2572 /* to the new IP address for the translation. */
2573 /* ------------------------------------------------------------------------ */
2574 static int
2575 ipf_nat_newmap(fr_info_t *fin, nat_t *nat, natinfo_t *ni)
2576 {
2577 ipf_main_softc_t *softc = fin->fin_main_soft;
2578 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
2579 u_short st_port, dport, sport, port, sp, dp;
2580 struct in_addr in, inb;
2581 hostmap_t *hm;
2582 u_32_t flags;
2583 u_32_t st_ip;
2584 ipnat_t *np;
2585 nat_t *natl;
2586 int l;
2587
2588 /*
2589 * If it's an outbound packet which doesn't match any existing
2590 * record, then create a new port
2591 */
2592 l = 0;
2593 hm = NULL;
2594 np = ni->nai_np;
2595 st_ip = np->in_snip;
2596 st_port = np->in_spnext;
2597 flags = nat->nat_flags;
2598
2599 if (flags & IPN_ICMPQUERY) {
2600 sport = fin->fin_data[1];
2601 dport = 0;
2602 } else {
2603 sport = htons(fin->fin_data[0]);
2604 dport = htons(fin->fin_data[1]);
2605 }
2606
2607 /*
2608 * Do a loop until we either run out of entries to try or we find
2609 * a NAT mapping that isn't currently being used. This is done
2610 * because the change to the source is not (usually) being fixed.
2611 */
2612 do {
2613 port = 0;
2614 in.s_addr = htonl(np->in_snip);
2615 if (l == 0) {
2616 /*
2617 * Check to see if there is an existing NAT
2618 * setup for this IP address pair.
2619 */
2620 hm = ipf_nat_hostmap(softn, np, fin->fin_src,
2621 fin->fin_dst, in, 0);
2622 if (hm != NULL)
2623 in.s_addr = hm->hm_nsrcip.s_addr;
2624 } else if ((l == 1) && (hm != NULL)) {
2625 ipf_nat_hostmapdel(softc, &hm);
2626 }
2627 in.s_addr = ntohl(in.s_addr);
2628
2629 nat->nat_hm = hm;
2630
2631 if ((np->in_nsrcmsk == 0xffffffff) && (np->in_spnext == 0)) {
2632 if (l > 0) {
2633 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_1);
2634 return -1;
2635 }
2636 }
2637
2638 if (np->in_redir == NAT_BIMAP &&
2639 np->in_osrcmsk == np->in_nsrcmsk) {
2640 /*
2641 * map the address block in a 1:1 fashion
2642 */
2643 in.s_addr = np->in_nsrcaddr;
2644 in.s_addr |= fin->fin_saddr & ~np->in_osrcmsk;
2645 in.s_addr = ntohl(in.s_addr);
2646
2647 } else if (np->in_redir & NAT_MAPBLK) {
2648 if ((l >= np->in_ppip) || ((l > 0) &&
2649 !(flags & IPN_TCPUDP))) {
2650 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_2);
2651 return -1;
2652 }
2653 /*
2654 * map-block - Calculate destination address.
2655 */
2656 in.s_addr = ntohl(fin->fin_saddr);
2657 in.s_addr &= ntohl(~np->in_osrcmsk);
2658 inb.s_addr = in.s_addr;
2659 in.s_addr /= np->in_ippip;
2660 in.s_addr &= ntohl(~np->in_nsrcmsk);
2661 in.s_addr += ntohl(np->in_nsrcaddr);
2662 /*
2663 * Calculate destination port.
2664 */
2665 if ((flags & IPN_TCPUDP) &&
2666 (np->in_ppip != 0)) {
2667 port = ntohs(sport) + l;
2668 port %= np->in_ppip;
2669 port += np->in_ppip *
2670 (inb.s_addr % np->in_ippip);
2671 port += MAPBLK_MINPORT;
2672 port = htons(port);
2673 }
2674
2675 } else if ((np->in_nsrcaddr == 0) &&
2676 (np->in_nsrcmsk == 0xffffffff)) {
2677 i6addr_t in6;
2678
2679 /*
2680 * 0/32 - use the interface's IP address.
2681 */
2682 if ((l > 0) ||
2683 ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp,
2684 &in6, NULL) == -1) {
2685 NBUMPSIDEX(1, ns_new_ifpaddr, ns_new_ifpaddr_1);
2686 return -1;
2687 }
2688 in.s_addr = ntohl(in6.in4.s_addr);
2689
2690 } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) {
2691 /*
2692 * 0/0 - use the original source address/port.
2693 */
2694 if (l > 0) {
2695 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_3);
2696 return -1;
2697 }
2698 in.s_addr = ntohl(fin->fin_saddr);
2699
2700 } else if ((np->in_nsrcmsk != 0xffffffff) &&
2701 (np->in_spnext == 0) && ((l > 0) || (hm == NULL)))
2702 np->in_snip++;
2703
2704 natl = NULL;
2705
2706 if ((flags & IPN_TCPUDP) &&
2707 ((np->in_redir & NAT_MAPBLK) == 0) &&
2708 (np->in_flags & IPN_AUTOPORTMAP)) {
2709 /*
2710 * "ports auto" (without map-block)
2711 */
2712 if ((l > 0) && np->in_ppip && (l % np->in_ppip == 0)) {
2713 if (l > np->in_space) {
2714 return -1;
2715 } else if ((l > np->in_ppip) &&
2716 np->in_nsrcmsk != 0xffffffff)
2717 np->in_snip++;
2718 }
2719 if (np->in_ppip != 0) {
2720 port = ntohs(sport);
2721 port += (l % np->in_ppip);
2722 port %= np->in_ppip;
2723 port += np->in_ppip *
2724 (ntohl(fin->fin_saddr) %
2725 np->in_ippip);
2726 port += MAPBLK_MINPORT;
2727 port = htons(port);
2728 }
2729
2730 } else if (((np->in_redir & NAT_MAPBLK) == 0) &&
2731 (flags & IPN_TCPUDPICMP) && (np->in_spnext != 0)) {
2732 /*
2733 * Standard port translation. Select next port.
2734 */
2735 if (np->in_flags & IPN_SEQUENTIAL) {
2736 port = np->in_spnext;
2737 } else {
2738 port = ipf_random() % (np->in_spmax -
2739 np->in_spmin + 1);
2740 port += np->in_spmin;
2741 }
2742 port = htons(port);
2743 np->in_spnext++;
2744
2745 if (np->in_spnext > np->in_spmax) {
2746 np->in_spnext = np->in_spmin;
2747 if (np->in_nsrcmsk != 0xffffffff)
2748 np->in_snip++;
2749 }
2750 }
2751
2752 if (np->in_flags & IPN_SIPRANGE) {
2753 if (np->in_snip > ntohl(np->in_nsrcmsk))
2754 np->in_snip = ntohl(np->in_nsrcaddr);
2755 } else {
2756 if ((np->in_nsrcmsk != 0xffffffff) &&
2757 ((np->in_snip + 1) & ntohl(np->in_nsrcmsk)) >
2758 ntohl(np->in_nsrcaddr))
2759 np->in_snip = ntohl(np->in_nsrcaddr) + 1;
2760 }
2761
2762 if ((port == 0) && (flags & (IPN_TCPUDPICMP|IPN_ICMPQUERY)))
2763 port = sport;
2764
2765 /*
2766 * Here we do a lookup of the connection as seen from
2767 * the outside. If an IP# pair already exists, try
2768 * again. So if you have A->B becomes C->B, you can
2769 * also have D->E become C->E but not D->B causing
2770 * another C->B. Also take protocol and ports into
2771 * account when determining whether a pre-existing
2772 * NAT setup will cause an external conflict where
2773 * this is appropriate.
2774 */
2775 inb.s_addr = htonl(in.s_addr);
2776 sp = fin->fin_data[0];
2777 dp = fin->fin_data[1];
2778 fin->fin_data[0] = fin->fin_data[1];
2779 fin->fin_data[1] = ntohs(port);
2780 natl = ipf_nat_inlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH),
2781 (u_int)fin->fin_p, fin->fin_dst, inb);
2782 fin->fin_data[0] = sp;
2783 fin->fin_data[1] = dp;
2784
2785 /*
2786 * Has the search wrapped around and come back to the
2787 * start ?
2788 */
2789 if ((natl != NULL) &&
2790 (np->in_spnext != 0) && (st_port == np->in_spnext) &&
2791 (np->in_snip != 0) && (st_ip == np->in_snip)) {
2792 NBUMPSIDED(1, ns_wrap);
2793 return -1;
2794 }
2795 l++;
2796 } while (natl != NULL);
2797
2798 /* Setup the NAT table */
2799 nat->nat_osrcip = fin->fin_src;
2800 nat->nat_nsrcaddr = htonl(in.s_addr);
2801 nat->nat_odstip = fin->fin_dst;
2802 nat->nat_ndstip = fin->fin_dst;
2803 if (nat->nat_hm == NULL)
2804 nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src,
2805 fin->fin_dst, nat->nat_nsrcip,
2806 0);
2807
2808 if (flags & IPN_TCPUDP) {
2809 nat->nat_osport = sport;
2810 nat->nat_nsport = port; /* sport */
2811 nat->nat_odport = dport;
2812 nat->nat_ndport = dport;
2813 ((tcphdr_t *)fin->fin_dp)->th_sport = port;
2814 } else if (flags & IPN_ICMPQUERY) {
2815 nat->nat_oicmpid = fin->fin_data[1];
2816 ((icmphdr_t *)fin->fin_dp)->icmp_id = port;
2817 nat->nat_nicmpid = port;
2818 }
2819 return 0;
2820 }
2821
2822
2823 /* ------------------------------------------------------------------------ */
2824 /* Function: ipf_nat_newrdr */
2825 /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */
2826 /* allow rule to be moved if IPN_ROUNDR is set. */
2827 /* Parameters: fin(I) - pointer to packet information */
2828 /* nat(I) - pointer to NAT entry */
2829 /* ni(I) - pointer to structure with misc. information needed */
2830 /* to create new NAT entry. */
2831 /* */
2832 /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/
2833 /* to the new IP address for the translation. */
2834 /* ------------------------------------------------------------------------ */
2835 static int
2836 ipf_nat_newrdr(fr_info_t *fin, nat_t *nat, natinfo_t *ni)
2837 {
2838 ipf_main_softc_t *softc = fin->fin_main_soft;
2839 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
2840 u_short nport, dport, sport;
2841 struct in_addr in, inb;
2842 u_short sp, dp;
2843 hostmap_t *hm;
2844 u_32_t flags;
2845 ipnat_t *np;
2846 nat_t *natl;
2847 int move;
2848
2849 move = 1;
2850 hm = NULL;
2851 in.s_addr = 0;
2852 np = ni->nai_np;
2853 flags = nat->nat_flags;
2854
2855 if (flags & IPN_ICMPQUERY) {
2856 dport = fin->fin_data[1];
2857 sport = 0;
2858 } else {
2859 sport = htons(fin->fin_data[0]);
2860 dport = htons(fin->fin_data[1]);
2861 }
2862
2863 /* TRACE sport, dport */
2864
2865
2866 /*
2867 * If the matching rule has IPN_STICKY set, then we want to have the
2868 * same rule kick in as before. Why would this happen? If you have
2869 * a collection of rdr rules with "round-robin sticky", the current
2870 * packet might match a different one to the previous connection but
2871 * we want the same destination to be used.
2872 */
2873 if (((np->in_flags & (IPN_ROUNDR|IPN_SPLIT)) != 0) &&
2874 ((np->in_flags & IPN_STICKY) != 0)) {
2875 hm = ipf_nat_hostmap(softn, NULL, fin->fin_src, fin->fin_dst,
2876 in, (u_32_t)dport);
2877 if (hm != NULL) {
2878 in.s_addr = ntohl(hm->hm_ndstip.s_addr);
2879 np = hm->hm_ipnat;
2880 ni->nai_np = np;
2881 move = 0;
2882 ipf_nat_hostmapdel(softc, &hm);
2883 }
2884 }
2885
2886 /*
2887 * Otherwise, it's an inbound packet. Most likely, we don't
2888 * want to rewrite source ports and source addresses. Instead,
2889 * we want to rewrite to a fixed internal address and fixed
2890 * internal port.
2891 */
2892 if (np->in_flags & IPN_SPLIT) {
2893 in.s_addr = np->in_dnip;
2894
2895 if ((np->in_flags & (IPN_ROUNDR|IPN_STICKY)) == IPN_STICKY) {
2896 hm = ipf_nat_hostmap(softn, NULL, fin->fin_src,
2897 fin->fin_dst, in, (u_32_t)dport);
2898 if (hm != NULL) {
2899 in.s_addr = hm->hm_ndstip.s_addr;
2900 move = 0;
2901 }
2902 }
2903
2904 if (hm == NULL || hm->hm_ref == 1) {
2905 if (np->in_ndstaddr == htonl(in.s_addr)) {
2906 np->in_dnip = ntohl(np->in_ndstmsk);
2907 move = 0;
2908 } else {
2909 np->in_dnip = ntohl(np->in_ndstaddr);
2910 }
2911 }
2912 if (hm != NULL)
2913 ipf_nat_hostmapdel(softc, &hm);
2914
2915 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) {
2916 i6addr_t in6;
2917
2918 /*
2919 * 0/32 - use the interface's IP address.
2920 */
2921 if (ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp,
2922 &in6, NULL) == -1) {
2923 NBUMPSIDEX(0, ns_new_ifpaddr, ns_new_ifpaddr_2);
2924 return -1;
2925 }
2926 in.s_addr = ntohl(in6.in4.s_addr);
2927
2928 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk== 0)) {
2929 /*
2930 * 0/0 - use the original destination address/port.
2931 */
2932 in.s_addr = ntohl(fin->fin_daddr);
2933
2934 } else if (np->in_redir == NAT_BIMAP &&
2935 np->in_ndstmsk == np->in_odstmsk) {
2936 /*
2937 * map the address block in a 1:1 fashion
2938 */
2939 in.s_addr = np->in_ndstaddr;
2940 in.s_addr |= fin->fin_daddr & ~np->in_ndstmsk;
2941 in.s_addr = ntohl(in.s_addr);
2942 } else {
2943 in.s_addr = ntohl(np->in_ndstaddr);
2944 }
2945
2946 if ((np->in_dpnext == 0) || ((flags & NAT_NOTRULEPORT) != 0))
2947 nport = dport;
2948 else {
2949 /*
2950 * Whilst not optimized for the case where
2951 * pmin == pmax, the gain is not significant.
2952 */
2953 if (((np->in_flags & IPN_FIXEDDPORT) == 0) &&
2954 (np->in_odport != np->in_dtop)) {
2955 nport = ntohs(dport) - np->in_odport + np->in_dpmax;
2956 nport = htons(nport);
2957 } else {
2958 nport = htons(np->in_dpnext);
2959 np->in_dpnext++;
2960 if (np->in_dpnext > np->in_dpmax)
2961 np->in_dpnext = np->in_dpmin;
2962 }
2963 }
2964
2965 /*
2966 * When the redirect-to address is set to 0.0.0.0, just
2967 * assume a blank `forwarding' of the packet. We don't
2968 * setup any translation for this either.
2969 */
2970 if (in.s_addr == 0) {
2971 if (nport == dport) {
2972 NBUMPSIDED(0, ns_xlate_null);
2973 return -1;
2974 }
2975 in.s_addr = ntohl(fin->fin_daddr);
2976 }
2977
2978 /*
2979 * Check to see if this redirect mapping already exists and if
2980 * it does, return "failure" (allowing it to be created will just
2981 * cause one or both of these "connections" to stop working.)
2982 */
2983 inb.s_addr = htonl(in.s_addr);
2984 sp = fin->fin_data[0];
2985 dp = fin->fin_data[1];
2986 fin->fin_data[1] = fin->fin_data[0];
2987 fin->fin_data[0] = ntohs(nport);
2988 natl = ipf_nat_outlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH),
2989 (u_int)fin->fin_p, inb, fin->fin_src);
2990 fin->fin_data[0] = sp;
2991 fin->fin_data[1] = dp;
2992 if (natl != NULL) {
2993 DT2(ns_new_xlate_exists, fr_info_t *, fin, nat_t *, natl);
2994 NBUMPSIDE(0, ns_xlate_exists);
2995 return -1;
2996 }
2997
2998 nat->nat_ndstaddr = htonl(in.s_addr);
2999 nat->nat_odstip = fin->fin_dst;
3000 nat->nat_nsrcip = fin->fin_src;
3001 nat->nat_osrcip = fin->fin_src;
3002 if ((nat->nat_hm == NULL) && ((np->in_flags & IPN_STICKY) != 0))
3003 nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src,
3004 fin->fin_dst, in, (u_32_t)dport);
3005
3006 if (flags & IPN_TCPUDP) {
3007 nat->nat_odport = dport;
3008 nat->nat_ndport = nport;
3009 nat->nat_osport = sport;
3010 nat->nat_nsport = sport;
3011 ((tcphdr_t *)fin->fin_dp)->th_dport = nport;
3012 } else if (flags & IPN_ICMPQUERY) {
3013 nat->nat_oicmpid = fin->fin_data[1];
3014 ((icmphdr_t *)fin->fin_dp)->icmp_id = nport;
3015 nat->nat_nicmpid = nport;
3016 }
3017
3018 return move;
3019 }
3020
3021 /* ------------------------------------------------------------------------ */
3022 /* Function: ipf_nat_add */
3023 /* Returns: nat_t* - NULL == failure to create new NAT structure, */
3024 /* else pointer to new NAT structure */
3025 /* Parameters: fin(I) - pointer to packet information */
3026 /* np(I) - pointer to NAT rule */
3027 /* natsave(I) - pointer to where to store NAT struct pointer */
3028 /* flags(I) - flags describing the current packet */
3029 /* direction(I) - direction of packet (in/out) */
3030 /* Write Lock: ipf_nat */
3031 /* */
3032 /* Attempts to create a new NAT entry. Does not actually change the packet */
3033 /* in any way. */
3034 /* */
3035 /* This fucntion is in three main parts: (1) deal with creating a new NAT */
3036 /* structure for a "MAP" rule (outgoing NAT translation); (2) deal with */
3037 /* creating a new NAT structure for a "RDR" rule (incoming NAT translation) */
3038 /* and (3) building that structure and putting it into the NAT table(s). */
3039 /* */
3040 /* NOTE: natsave should NOT be used top point back to an ipstate_t struct */
3041 /* as it can result in memory being corrupted. */
3042 /* ------------------------------------------------------------------------ */
3043 nat_t *
3044 ipf_nat_add(fr_info_t *fin, ipnat_t *np, nat_t **natsave, u_int flags,
3045 int direction)
3046 {
3047 ipf_main_softc_t *softc = fin->fin_main_soft;
3048 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
3049 hostmap_t *hm = NULL;
3050 nat_t *nat, *natl;
3051 natstat_t *nsp;
3052 u_int nflags;
3053 natinfo_t ni;
3054 int move;
3055
3056 memset(&ni, 0, sizeof ni); /* XXX gcc */
3057 nsp = &softn->ipf_nat_stats;
3058
3059 if ((nsp->ns_active * 100 / softn->ipf_nat_table_max) >
3060 softn->ipf_nat_table_wm_high) {
3061 softn->ipf_nat_doflush = 1;
3062 }
3063
3064 if (nsp->ns_active >= softn->ipf_nat_table_max) {
3065 NBUMPSIDED(fin->fin_out, ns_table_max);
3066 return NULL;
3067 }
3068
3069 move = 1;
3070 nflags = np->in_flags & flags;
3071 nflags &= NAT_FROMRULE;
3072
3073 ni.nai_np = np;
3074 ni.nai_dport = 0;
3075 ni.nai_sport = 0;
3076
3077 /* Give me a new nat */
3078 KMALLOC(nat, nat_t *);
3079 if (nat == NULL) {
3080 NBUMPSIDED(fin->fin_out, ns_memfail);
3081 /*
3082 * Try to automatically tune the max # of entries in the
3083 * table allowed to be less than what will cause kmem_alloc()
3084 * to fail and try to eliminate panics due to out of memory
3085 * conditions arising.
3086 */
3087 if ((softn->ipf_nat_table_max > softn->ipf_nat_table_sz) &&
3088 (nsp->ns_active > 100)) {
3089 softn->ipf_nat_table_max = nsp->ns_active - 100;
3090 printf("table_max reduced to %d\n",
3091 softn->ipf_nat_table_max);
3092 }
3093 return NULL;
3094 }
3095
3096 if (flags & IPN_ICMPQUERY) {
3097 /*
3098 * In the ICMP query NAT code, we translate the ICMP id fields
3099 * to make them unique. This is indepedent of the ICMP type
3100 * (e.g. in the unlikely event that a host sends an echo and
3101 * an tstamp request with the same id, both packets will have
3102 * their ip address/id field changed in the same way).
3103 */
3104 /* The icmp_id field is used by the sender to identify the
3105 * process making the icmp request. (the receiver justs
3106 * copies it back in its response). So, it closely matches
3107 * the concept of source port. We overlay sport, so we can
3108 * maximally reuse the existing code.
3109 */
3110 ni.nai_sport = fin->fin_data[1];
3111 ni.nai_dport = 0;
3112 }
3113
3114 bzero((char *)nat, sizeof(*nat));
3115 nat->nat_flags = flags;
3116 nat->nat_redir = np->in_redir;
3117 nat->nat_dir = direction;
3118 nat->nat_pr[0] = fin->fin_p;
3119 nat->nat_pr[1] = fin->fin_p;
3120
3121 /*
3122 * Search the current table for a match and create a new mapping
3123 * if there is none found.
3124 */
3125 if (np->in_redir & NAT_DIVERTUDP) {
3126 move = ipf_nat_newdivert(fin, nat, &ni);
3127
3128 } else if (np->in_redir & NAT_REWRITE) {
3129 move = ipf_nat_newrewrite(fin, nat, &ni);
3130
3131 } else if (direction == NAT_OUTBOUND) {
3132 /*
3133 * We can now arrange to call this for the same connection
3134 * because ipf_nat_new doesn't protect the code path into
3135 * this function.
3136 */
3137 natl = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p,
3138 fin->fin_src, fin->fin_dst);
3139 if (natl != NULL) {
3140 KFREE(nat);
3141 nat = natl;
3142 goto done;
3143 }
3144
3145 move = ipf_nat_newmap(fin, nat, &ni);
3146 } else {
3147 /*
3148 * NAT_INBOUND is used for redirects rules
3149 */
3150 natl = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p,
3151 fin->fin_src, fin->fin_dst);
3152 if (natl != NULL) {
3153 KFREE(nat);
3154 nat = natl;
3155 goto done;
3156 }
3157
3158 move = ipf_nat_newrdr(fin, nat, &ni);
3159 }
3160 if (move == -1)
3161 goto badnat;
3162
3163 np = ni.nai_np;
3164
3165 nat->nat_mssclamp = np->in_mssclamp;
3166 nat->nat_me = natsave;
3167 nat->nat_fr = fin->fin_fr;
3168 nat->nat_rev = fin->fin_rev;
3169 nat->nat_ptr = np;
3170 nat->nat_dlocal = np->in_dlocal;
3171
3172 if ((np->in_apr != NULL) && ((nat->nat_flags & NAT_SLAVE) == 0)) {
3173 if (ipf_proxy_new(fin, nat) == -1) {
3174 NBUMPSIDED(fin->fin_out, ns_appr_fail);
3175 goto badnat;
3176 }
3177 }
3178
3179 nat->nat_ifps[0] = np->in_ifps[0];
3180 if (np->in_ifps[0] != NULL) {
3181 COPYIFNAME(np->in_v[0], np->in_ifps[0], nat->nat_ifnames[0]);
3182 }
3183
3184 nat->nat_ifps[1] = np->in_ifps[1];
3185 if (np->in_ifps[1] != NULL) {
3186 COPYIFNAME(np->in_v[1], np->in_ifps[1], nat->nat_ifnames[1]);
3187 }
3188
3189 if (ipf_nat_finalise(fin, nat) == -1) {
3190 goto badnat;
3191 }
3192
3193 np->in_use++;
3194
3195 if ((move == 1) && (np->in_flags & IPN_ROUNDR)) {
3196 if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_REDIRECT) {
3197 ipf_nat_delrdr(softn, np);
3198 ipf_nat_addrdr(softn, np);
3199 } else if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_MAP) {
3200 ipf_nat_delmap(softn, np);
3201 ipf_nat_addmap(softn, np);
3202 }
3203 }
3204
3205 if (flags & SI_WILDP)
3206 nsp->ns_wilds++;
3207 nsp->ns_proto[nat->nat_pr[0]]++;
3208
3209 goto done;
3210 badnat:
3211 DT2(ns_badnatnew, fr_info_t *, fin, nat_t *, nat);
3212 NBUMPSIDE(fin->fin_out, ns_badnatnew);
3213 if ((hm = nat->nat_hm) != NULL)
3214 ipf_nat_hostmapdel(softc, &hm);
3215 KFREE(nat);
3216 nat = NULL;
3217 done:
3218 if (nat != NULL && np != NULL)
3219 np->in_hits++;
3220 if (natsave != NULL)
3221 *natsave = nat;
3222 return nat;
3223 }
3224
3225
3226 /* ------------------------------------------------------------------------ */
3227 /* Function: ipf_nat_finalise */
3228 /* Returns: int - 0 == sucess, -1 == failure */
3229 /* Parameters: fin(I) - pointer to packet information */
3230 /* nat(I) - pointer to NAT entry */
3231 /* Write Lock: ipf_nat */
3232 /* */
3233 /* This is the tail end of constructing a new NAT entry and is the same */
3234 /* for both IPv4 and IPv6. */
3235 /* ------------------------------------------------------------------------ */
3236 /*ARGSUSED*/
3237 static int
3238 ipf_nat_finalise(fr_info_t *fin, nat_t *nat)
3239 {
3240 ipf_main_softc_t *softc = fin->fin_main_soft;
3241 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
3242 u_32_t sum1, sum2, sumd;
3243 frentry_t *fr;
3244 u_32_t flags;
3245 #if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_M_CTL_MAGIC)
3246 qpktinfo_t *qpi = fin->fin_qpi;
3247 #endif
3248
3249 flags = nat->nat_flags;
3250
3251 switch (nat->nat_pr[0])
3252 {
3253 case IPPROTO_ICMP :
3254 sum1 = LONG_SUM(ntohs(nat->nat_oicmpid));
3255 sum2 = LONG_SUM(ntohs(nat->nat_nicmpid));
3256 CALC_SUMD(sum1, sum2, sumd);
3257 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16);
3258
3259 break;
3260
3261 default :
3262 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr) + \
3263 ntohs(nat->nat_osport));
3264 sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr) + \
3265 ntohs(nat->nat_nsport));
3266 CALC_SUMD(sum1, sum2, sumd);
3267 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16);
3268
3269 sum1 = LONG_SUM(ntohl(nat->nat_odstaddr) + \
3270 ntohs(nat->nat_odport));
3271 sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr) + \
3272 ntohs(nat->nat_ndport));
3273 CALC_SUMD(sum1, sum2, sumd);
3274 nat->nat_sumd[0] += (sumd & 0xffff) + (sumd >> 16);
3275 break;
3276 }
3277
3278 /*
3279 * Compute the partial checksum, just in case.
3280 * This is only ever placed into outbound packets so care needs
3281 * to be taken over which pair of addresses are used.
3282 */
3283 if (nat->nat_dir == NAT_OUTBOUND) {
3284 sum1 = LONG_SUM(ntohl(nat->nat_nsrcaddr));
3285 sum1 += LONG_SUM(ntohl(nat->nat_ndstaddr));
3286 } else {
3287 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr));
3288 sum1 += LONG_SUM(ntohl(nat->nat_odstaddr));
3289 }
3290 sum1 += nat->nat_pr[1];
3291 nat->nat_sumd[1] = (sum1 & 0xffff) + (sum1 >> 16);
3292
3293 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr));
3294 sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr));
3295 CALC_SUMD(sum1, sum2, sumd);
3296 nat->nat_ipsumd = (sumd & 0xffff) + (sumd >> 16);
3297
3298 sum1 = LONG_SUM(ntohl(nat->nat_odstaddr));
3299 sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr));
3300 CALC_SUMD(sum1, sum2, sumd);
3301 nat->nat_ipsumd += (sumd & 0xffff) + (sumd >> 16);
3302
3303 nat->nat_v[0] = 4;
3304 nat->nat_v[1] = 4;
3305
3306 if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) {
3307 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]);
3308 }
3309
3310 if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) {
3311 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]);
3312 }
3313
3314 if ((nat->nat_flags & SI_CLONE) == 0)
3315 nat->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, nat);
3316
3317 if (ipf_nat_insert(softc, softn, nat) == 0) {
3318 if (softn->ipf_nat_logging)
3319 ipf_nat_log(softc, softn, nat, NL_NEW);
3320 fr = nat->nat_fr;
3321 if (fr != NULL) {
3322 MUTEX_ENTER(&fr->fr_lock);
3323 fr->fr_ref++;
3324 MUTEX_EXIT(&fr->fr_lock);
3325 }
3326 return 0;
3327 }
3328
3329 NBUMPSIDED(fin->fin_out, ns_unfinalised);
3330 /*
3331 * nat_insert failed, so cleanup time...
3332 */
3333 if (nat->nat_sync != NULL)
3334 ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync);
3335 return -1;
3336 }
3337
3338
3339 /* ------------------------------------------------------------------------ */
3340 /* Function: ipf_nat_insert */
3341 /* Returns: int - 0 == sucess, -1 == failure */
3342 /* Parameters: softc(I) - pointer to soft context main structure */
3343 /* softn(I) - pointer to NAT context structure */
3344 /* nat(I) - pointer to NAT structure */
3345 /* Write Lock: ipf_nat */
3346 /* */
3347 /* Insert a NAT entry into the hash tables for searching and add it to the */
3348 /* list of active NAT entries. Adjust global counters when complete. */
3349 /* ------------------------------------------------------------------------ */
3350 int
3351 ipf_nat_insert(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat)
3352 {
3353 u_int hv0, hv1;
3354 u_int sp, dp;
3355 ipnat_t *in;
3356
3357 /*
3358 * Try and return an error as early as possible, so calculate the hash
3359 * entry numbers first and then proceed.
3360 */
3361 if ((nat->nat_flags & (SI_W_SPORT|SI_W_DPORT)) == 0) {
3362 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
3363 sp = nat->nat_osport;
3364 dp = nat->nat_odport;
3365 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) {
3366 sp = 0;
3367 dp = nat->nat_oicmpid;
3368 } else {
3369 sp = 0;
3370 dp = 0;
3371 }
3372 hv0 = NAT_HASH_FN(nat->nat_osrcaddr, sp, 0xffffffff);
3373 hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0 + dp, 0xffffffff);
3374 /*
3375 * TRACE nat_osrcaddr, nat_osport, nat_odstaddr,
3376 * nat_odport, hv0
3377 */
3378
3379 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
3380 sp = nat->nat_nsport;
3381 dp = nat->nat_ndport;
3382 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) {
3383 sp = 0;
3384 dp = nat->nat_nicmpid;
3385 } else {
3386 sp = 0;
3387 dp = 0;
3388 }
3389 hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, sp, 0xffffffff);
3390 hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1 + dp, 0xffffffff);
3391 /*
3392 * TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr,
3393 * nat_ndport, hv1
3394 */
3395 } else {
3396 hv0 = NAT_HASH_FN(nat->nat_osrcaddr, 0, 0xffffffff);
3397 hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0, 0xffffffff);
3398 /* TRACE nat_osrcaddr, nat_odstaddr, hv0 */
3399
3400 hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, 0, 0xffffffff);
3401 hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1, 0xffffffff);
3402 /* TRACE nat_nsrcaddr, nat_ndstaddr, hv1 */
3403 }
3404
3405 nat->nat_hv[0] = hv0;
3406 nat->nat_hv[1] = hv1;
3407
3408 MUTEX_INIT(&nat->nat_lock, "nat entry lock");
3409
3410 in = nat->nat_ptr;
3411 nat->nat_ref = nat->nat_me ? 2 : 1;
3412
3413 nat->nat_ifnames[0][LIFNAMSIZ - 1] = '\0';
3414 nat->nat_ifps[0] = ipf_resolvenic(softc, nat->nat_ifnames[0], 4);
3415
3416 if (nat->nat_ifnames[1][0] != '\0') {
3417 nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0';
3418 nat->nat_ifps[1] = ipf_resolvenic(softc,
3419 nat->nat_ifnames[1], 4);
3420 } else if (in->in_ifnames[1] != -1) {
3421 char *name;
3422
3423 name = in->in_names + in->in_ifnames[1];
3424 if (name[1] != '\0' && name[0] != '-' && name[0] != '*') {
3425 (void) strncpy(nat->nat_ifnames[1],
3426 nat->nat_ifnames[0], LIFNAMSIZ);
3427 nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0';
3428 nat->nat_ifps[1] = nat->nat_ifps[0];
3429 }
3430 }
3431 if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) {
3432 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]);
3433 }
3434 if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) {
3435 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]);
3436 }
3437
3438 return ipf_nat_hashtab_add(softc, softn, nat);
3439 }
3440
3441
3442 /* ------------------------------------------------------------------------ */
3443 /* Function: ipf_nat_hashtab_add */
3444 /* Parameters: softc(I) - pointer to soft context main structure */
3445 /* softn(I) - pointer to NAT context structure */
3446 /* nat(I) - pointer to NAT structure */
3447 /* */
3448 /* Handle the insertion of a NAT entry into the table/list. */
3449 /* ------------------------------------------------------------------------ */
3450 int
3451 ipf_nat_hashtab_add(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat)
3452 {
3453 nat_t **natp;
3454 u_int hv0;
3455 u_int hv1;
3456
3457 hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz;
3458 hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz;
3459
3460 if (nat->nat_dir == NAT_INBOUND || nat->nat_dir == NAT_DIVERTIN) {
3461 u_int swap;
3462
3463 swap = hv0;
3464 hv0 = hv1;
3465 hv1 = swap;
3466 }
3467
3468 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0] >=
3469 softn->ipf_nat_maxbucket) {
3470 DT1(ns_bucket_max_0, int,
3471 softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0]);
3472 NBUMPSIDE(0, ns_bucket_max);
3473 return -1;
3474 }
3475
3476 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1] >=
3477 softn->ipf_nat_maxbucket) {
3478 DT1(ns_bucket_max_1, int,
3479 softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1]);
3480 NBUMPSIDE(1, ns_bucket_max);
3481 return -1;
3482 }
3483
3484 /*
3485 * The ordering of operations in the list and hash table insertion
3486 * is very important. The last operation for each task should be
3487 * to update the top of the list, after all the "nexts" have been
3488 * done so that walking the list while it is being done does not
3489 * find strange pointers.
3490 *
3491 * Global list of NAT instances
3492 */
3493 nat->nat_next = softn->ipf_nat_instances;
3494 nat->nat_pnext = &softn->ipf_nat_instances;
3495 if (softn->ipf_nat_instances)
3496 softn->ipf_nat_instances->nat_pnext = &nat->nat_next;
3497 softn->ipf_nat_instances = nat;
3498
3499 /*
3500 * Inbound hash table.
3501 */
3502 natp = &softn->ipf_nat_table[0][hv0];
3503 nat->nat_phnext[0] = natp;
3504 nat->nat_hnext[0] = *natp;
3505 if (*natp) {
3506 (*natp)->nat_phnext[0] = &nat->nat_hnext[0];
3507 } else {
3508 NBUMPSIDE(0, ns_inuse);
3509 }
3510 *natp = nat;
3511 NBUMPSIDE(0, ns_bucketlen[hv0]);
3512
3513 /*
3514 * Outbound hash table.
3515 */
3516 natp = &softn->ipf_nat_table[1][hv1];
3517 nat->nat_phnext[1] = natp;
3518 nat->nat_hnext[1] = *natp;
3519 if (*natp)
3520 (*natp)->nat_phnext[1] = &nat->nat_hnext[1];
3521 else {
3522 NBUMPSIDE(1, ns_inuse);
3523 }
3524 *natp = nat;
3525 NBUMPSIDE(1, ns_bucketlen[hv1]);
3526
3527 ipf_nat_setqueue(softc, softn, nat);
3528
3529 if (nat->nat_dir & NAT_OUTBOUND) {
3530 NBUMPSIDE(1, ns_added);
3531 } else {
3532 NBUMPSIDE(0, ns_added);
3533 }
3534 softn->ipf_nat_stats.ns_active++;
3535 return 0;
3536 }
3537
3538
3539 /* ------------------------------------------------------------------------ */
3540 /* Function: ipf_nat_icmperrorlookup */
3541 /* Returns: nat_t* - point to matching NAT structure */
3542 /* Parameters: fin(I) - pointer to packet information */
3543 /* dir(I) - direction of packet (in/out) */
3544 /* */
3545 /* Check if the ICMP error message is related to an existing TCP, UDP or */
3546 /* ICMP query nat entry. It is assumed that the packet is already of the */
3547 /* the required length. */
3548 /* ------------------------------------------------------------------------ */
3549 nat_t *
3550 ipf_nat_icmperrorlookup(fr_info_t *fin, int dir)
3551 {
3552 ipf_main_softc_t *softc = fin->fin_main_soft;
3553 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
3554 int flags = 0, type, minlen;
3555 icmphdr_t *icmp, *orgicmp;
3556 nat_stat_side_t *nside;
3557 tcphdr_t *tcp = NULL;
3558 u_short data[2];
3559 nat_t *nat;
3560 ip_t *oip;
3561 u_int p;
3562
3563 icmp = fin->fin_dp;
3564 type = icmp->icmp_type;
3565 nside = &softn->ipf_nat_stats.ns_side[fin->fin_out];
3566 /*
3567 * Does it at least have the return (basic) IP header ?
3568 * Only a basic IP header (no options) should be with an ICMP error
3569 * header. Also, if it's not an error type, then return.
3570 */
3571 if ((fin->fin_hlen != sizeof(ip_t)) || !(fin->fin_flx & FI_ICMPERR)) {
3572 ATOMIC_INCL(nside->ns_icmp_basic);
3573 return NULL;
3574 }
3575
3576 /*
3577 * Check packet size
3578 */
3579 oip = (ip_t *)((char *)fin->fin_dp + 8);
3580 minlen = IP_HL(oip) << 2;
3581 if ((minlen < sizeof(ip_t)) ||
3582 (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen)) {
3583 ATOMIC_INCL(nside->ns_icmp_size);
3584 return NULL;
3585 }
3586
3587 /*
3588 * Is the buffer big enough for all of it ? It's the size of the IP
3589 * header claimed in the encapsulated part which is of concern. It
3590 * may be too big to be in this buffer but not so big that it's
3591 * outside the ICMP packet, leading to TCP deref's causing problems.
3592 * This is possible because we don't know how big oip_hl is when we
3593 * do the pullup early in ipf_check() and thus can't gaurantee it is
3594 * all here now.
3595 */
3596 #ifdef ipf_nat_KERNEL
3597 {
3598 mb_t *m;
3599
3600 m = fin->fin_m;
3601 # if defined(MENTAT)
3602 if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN >
3603 (char *)m->b_wptr) {
3604 ATOMIC_INCL(nside->ns_icmp_mbuf);
3605 return NULL;
3606 }
3607 # else
3608 if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN >
3609 (char *)fin->fin_ip + M_LEN(m)) {
3610 ATOMIC_INCL(nside->ns_icmp_mbuf);
3611 return NULL;
3612 }
3613 # endif
3614 }
3615 #endif
3616
3617 if (fin->fin_daddr != oip->ip_src.s_addr) {
3618 ATOMIC_INCL(nside->ns_icmp_address);
3619 return NULL;
3620 }
3621
3622 p = oip->ip_p;
3623 if (p == IPPROTO_TCP)
3624 flags = IPN_TCP;
3625 else if (p == IPPROTO_UDP)
3626 flags = IPN_UDP;
3627 else if (p == IPPROTO_ICMP) {
3628 orgicmp = (icmphdr_t *)((char *)oip + (IP_HL(oip) << 2));
3629
3630 /* see if this is related to an ICMP query */
3631 if (ipf_nat_icmpquerytype(orgicmp->icmp_type)) {
3632 data[0] = fin->fin_data[0];
3633 data[1] = fin->fin_data[1];
3634 fin->fin_data[0] = 0;
3635 fin->fin_data[1] = orgicmp->icmp_id;
3636
3637 flags = IPN_ICMPERR|IPN_ICMPQUERY;
3638 /*
3639 * NOTE : dir refers to the direction of the original
3640 * ip packet. By definition the icmp error
3641 * message flows in the opposite direction.
3642 */
3643 if (dir == NAT_INBOUND)
3644 nat = ipf_nat_inlookup(fin, flags, p,
3645 oip->ip_dst,
3646 oip->ip_src);
3647 else
3648 nat = ipf_nat_outlookup(fin, flags, p,
3649 oip->ip_dst,
3650 oip->ip_src);
3651 fin->fin_data[0] = data[0];
3652 fin->fin_data[1] = data[1];
3653 return nat;
3654 }
3655 }
3656
3657 if (flags & IPN_TCPUDP) {
3658 minlen += 8; /* + 64bits of data to get ports */
3659 /* TRACE (fin,minlen) */
3660 if (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen) {
3661 ATOMIC_INCL(nside->ns_icmp_short);
3662 return NULL;
3663 }
3664
3665 data[0] = fin->fin_data[0];
3666 data[1] = fin->fin_data[1];
3667 tcp = (tcphdr_t *)((char *)oip + (IP_HL(oip) << 2));
3668 fin->fin_data[0] = ntohs(tcp->th_dport);
3669 fin->fin_data[1] = ntohs(tcp->th_sport);
3670
3671 if (dir == NAT_INBOUND) {
3672 nat = ipf_nat_inlookup(fin, flags, p, oip->ip_dst,
3673 oip->ip_src);
3674 } else {
3675 nat = ipf_nat_outlookup(fin, flags, p, oip->ip_dst,
3676 oip->ip_src);
3677 }
3678 fin->fin_data[0] = data[0];
3679 fin->fin_data[1] = data[1];
3680 return nat;
3681 }
3682 if (dir == NAT_INBOUND)
3683 nat = ipf_nat_inlookup(fin, 0, p, oip->ip_dst, oip->ip_src);
3684 else
3685 nat = ipf_nat_outlookup(fin, 0, p, oip->ip_dst, oip->ip_src);
3686
3687 return nat;
3688 }
3689
3690
3691 /* ------------------------------------------------------------------------ */
3692 /* Function: ipf_nat_icmperror */
3693 /* Returns: nat_t* - point to matching NAT structure */
3694 /* Parameters: fin(I) - pointer to packet information */
3695 /* nflags(I) - NAT flags for this packet */
3696 /* dir(I) - direction of packet (in/out) */
3697 /* */
3698 /* Fix up an ICMP packet which is an error message for an existing NAT */
3699 /* session. This will correct both packet header data and checksums. */
3700 /* */
3701 /* This should *ONLY* be used for incoming ICMP error packets to make sure */
3702 /* a NAT'd ICMP packet gets correctly recognised. */
3703 /* ------------------------------------------------------------------------ */
3704 nat_t *
3705 ipf_nat_icmperror(fr_info_t *fin, u_int *nflags, int dir)
3706 {
3707 ipf_main_softc_t *softc = fin->fin_main_soft;
3708 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
3709 u_32_t sum1, sum2, sumd, sumd2;
3710 struct in_addr a1, a2, a3, a4;
3711 int flags, dlen, odst;
3712 icmphdr_t *icmp;
3713 u_short *csump;
3714 tcphdr_t *tcp;
3715 nat_t *nat;
3716 ip_t *oip;
3717 void *dp;
3718
3719 if ((fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) {
3720 NBUMPSIDED(fin->fin_out, ns_icmp_short);
3721 return NULL;
3722 }
3723
3724 /*
3725 * ipf_nat_icmperrorlookup() will return NULL for `defective' packets.
3726 */
3727 if ((fin->fin_v != 4) || !(nat = ipf_nat_icmperrorlookup(fin, dir))) {
3728 NBUMPSIDED(fin->fin_out, ns_icmp_notfound);
3729 return NULL;
3730 }
3731
3732 tcp = NULL;
3733 csump = NULL;
3734 flags = 0;
3735 sumd2 = 0;
3736 *nflags = IPN_ICMPERR;
3737 icmp = fin->fin_dp;
3738 oip = (ip_t *)&icmp->icmp_ip;
3739 dp = (((char *)oip) + (IP_HL(oip) << 2));
3740 if (oip->ip_p == IPPROTO_TCP) {
3741 tcp = (tcphdr_t *)dp;
3742 csump = (u_short *)&tcp->th_sum;
3743 flags = IPN_TCP;
3744 } else if (oip->ip_p == IPPROTO_UDP) {
3745 udphdr_t *udp;
3746
3747 udp = (udphdr_t *)dp;
3748 tcp = (tcphdr_t *)dp;
3749 csump = (u_short *)&udp->uh_sum;
3750 flags = IPN_UDP;
3751 } else if (oip->ip_p == IPPROTO_ICMP)
3752 flags = IPN_ICMPQUERY;
3753 dlen = fin->fin_plen - ((char *)dp - (char *)fin->fin_ip);
3754
3755 /*
3756 * Need to adjust ICMP header to include the real IP#'s and
3757 * port #'s. Only apply a checksum change relative to the
3758 * IP address change as it will be modified again in ipf_nat_checkout
3759 * for both address and port. Two checksum changes are
3760 * necessary for the two header address changes. Be careful
3761 * to only modify the checksum once for the port # and twice
3762 * for the IP#.
3763 */
3764
3765 /*
3766 * Step 1
3767 * Fix the IP addresses in the offending IP packet. You also need
3768 * to adjust the IP header checksum of that offending IP packet.
3769 *
3770 * Normally, you would expect that the ICMP checksum of the
3771 * ICMP error message needs to be adjusted as well for the
3772 * IP address change in oip.
3773 * However, this is a NOP, because the ICMP checksum is
3774 * calculated over the complete ICMP packet, which includes the
3775 * changed oip IP addresses and oip->ip_sum. However, these
3776 * two changes cancel each other out (if the delta for
3777 * the IP address is x, then the delta for ip_sum is minus x),
3778 * so no change in the icmp_cksum is necessary.
3779 *
3780 * Inbound ICMP
3781 * ------------
3782 * MAP rule, SRC=a,DST=b -> SRC=c,DST=b
3783 * - response to outgoing packet (a,b)=>(c,b) (OIP_SRC=c,OIP_DST=b)
3784 * - OIP_SRC(c)=nat_newsrcip, OIP_DST(b)=nat_newdstip
3785 *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(b)=nat_olddstip
3786 *
3787 * RDR rule, SRC=a,DST=b -> SRC=a,DST=c
3788 * - response to outgoing packet (c,a)=>(b,a) (OIP_SRC=b,OIP_DST=a)
3789 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip
3790 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip
3791 *
3792 * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d
3793 * - response to outgoing packet (a,b)=>(c,d) (OIP_SRC=c,OIP_DST=d)
3794 * - OIP_SRC(c)=nat_newsrcip, OIP_DST(d)=nat_newdstip
3795 *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(d)=nat_olddstip
3796 *
3797 * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d
3798 * - response to outgoing packet (d,c)=>(b,a) (OIP_SRC=b,OIP_DST=a)
3799 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip
3800 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip
3801 *
3802 * Outbound ICMP
3803 * -------------
3804 * MAP rule, SRC=a,DST=b -> SRC=c,DST=b
3805 * - response to incoming packet (b,c)=>(b,a) (OIP_SRC=b,OIP_DST=a)
3806 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip
3807 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip
3808 *
3809 * RDR rule, SRC=a,DST=b -> SRC=a,DST=c
3810 * - response to incoming packet (a,b)=>(a,c) (OIP_SRC=a,OIP_DST=c)
3811 * - OIP_SRC(a)=nat_newsrcip, OIP_DST(c)=nat_newdstip
3812 *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip
3813 *
3814 * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d
3815 * - response to incoming packet (d,c)=>(b,a) (OIP_SRC=c,OIP_DST=d)
3816 * - OIP_SRC(c)=nat_olddstip, OIP_DST(d)=nat_oldsrcip
3817 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip
3818 *
3819 * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d
3820 * - response to incoming packet (a,b)=>(c,d) (OIP_SRC=b,OIP_DST=a)
3821 * - OIP_SRC(b)=nat_newsrcip, OIP_DST(a)=nat_newdstip
3822 *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip
3823 */
3824
3825 if (((fin->fin_out == 0) && ((nat->nat_redir & NAT_MAP) != 0)) ||
3826 ((fin->fin_out == 1) && ((nat->nat_redir & NAT_REDIRECT) != 0))) {
3827 a1.s_addr = ntohl(nat->nat_osrcaddr);
3828 a4.s_addr = ntohl(oip->ip_src.s_addr);
3829 a3.s_addr = ntohl(nat->nat_odstaddr);
3830 a2.s_addr = ntohl(oip->ip_dst.s_addr);
3831 oip->ip_src.s_addr = htonl(a1.s_addr);
3832 oip->ip_dst.s_addr = htonl(a3.s_addr);
3833 odst = 1;
3834 } else {
3835 a1.s_addr = ntohl(nat->nat_ndstaddr);
3836 a2.s_addr = ntohl(oip->ip_dst.s_addr);
3837 a3.s_addr = ntohl(nat->nat_nsrcaddr);
3838 a4.s_addr = ntohl(oip->ip_src.s_addr);
3839 oip->ip_dst.s_addr = htonl(a3.s_addr);
3840 oip->ip_src.s_addr = htonl(a1.s_addr);
3841 odst = 0;
3842 }
3843 sum1 = 0;
3844 sum2 = 0;
3845 sumd = 0;
3846 CALC_SUMD(a2.s_addr, a3.s_addr, sum1);
3847 CALC_SUMD(a4.s_addr, a1.s_addr, sum2);
3848 sumd = sum2 + sum1;
3849 if (sumd != 0)
3850 ipf_fix_datacksum(&oip->ip_sum, sumd);
3851
3852 sumd2 = sumd;
3853 sum1 = 0;
3854 sum2 = 0;
3855
3856 /*
3857 * Fix UDP pseudo header checksum to compensate for the
3858 * IP address change.
3859 */
3860 if (((flags & IPN_TCPUDP) != 0) && (dlen >= 4)) {
3861 u_32_t sum3, sum4, sumt;
3862
3863 /*
3864 * Step 2 :
3865 * For offending TCP/UDP IP packets, translate the ports as
3866 * well, based on the NAT specification. Of course such
3867 * a change may be reflected in the ICMP checksum as well.
3868 *
3869 * Since the port fields are part of the TCP/UDP checksum
3870 * of the offending IP packet, you need to adjust that checksum
3871 * as well... except that the change in the port numbers should
3872 * be offset by the checksum change. However, the TCP/UDP
3873 * checksum will also need to change if there has been an
3874 * IP address change.
3875 */
3876 if (odst == 1) {
3877 sum1 = ntohs(nat->nat_osport);
3878 sum4 = ntohs(tcp->th_sport);
3879 sum3 = ntohs(nat->nat_odport);
3880 sum2 = ntohs(tcp->th_dport);
3881
3882 tcp->th_sport = htons(sum1);
3883 tcp->th_dport = htons(sum3);
3884 } else {
3885 sum1 = ntohs(nat->nat_ndport);
3886 sum2 = ntohs(tcp->th_dport);
3887 sum3 = ntohs(nat->nat_nsport);
3888 sum4 = ntohs(tcp->th_sport);
3889
3890 tcp->th_dport = htons(sum3);
3891 tcp->th_sport = htons(sum1);
3892 }
3893 CALC_SUMD(sum4, sum1, sumt);
3894 sumd += sumt;
3895 CALC_SUMD(sum2, sum3, sumt);
3896 sumd += sumt;
3897
3898 if (sumd != 0 || sumd2 != 0) {
3899 /*
3900 * At this point, sumd is the delta to apply to the
3901 * TCP/UDP header, given the changes in both the IP
3902 * address and the ports and sumd2 is the delta to
3903 * apply to the ICMP header, given the IP address
3904 * change delta that may need to be applied to the
3905 * TCP/UDP checksum instead.
3906 *
3907 * If we will both the IP and TCP/UDP checksums
3908 * then the ICMP checksum changes by the address
3909 * delta applied to the TCP/UDP checksum. If we
3910 * do not change the TCP/UDP checksum them we
3911 * apply the delta in ports to the ICMP checksum.
3912 */
3913 if (oip->ip_p == IPPROTO_UDP) {
3914 if ((dlen >= 8) && (*csump != 0)) {
3915 ipf_fix_datacksum(csump, sumd);
3916 } else {
3917 CALC_SUMD(sum1, sum4, sumd2);
3918 CALC_SUMD(sum3, sum2, sumt);
3919 sumd2 += sumt;
3920 }
3921 } else if (oip->ip_p == IPPROTO_TCP) {
3922 if (dlen >= 18) {
3923 ipf_fix_datacksum(csump, sumd);
3924 } else {
3925 CALC_SUMD(sum1, sum4, sumd2);
3926 CALC_SUMD(sum3, sum2, sumt);
3927 sumd2 += sumt;
3928 }
3929 }
3930 if (sumd2 != 0) {
3931 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16);
3932 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16);
3933 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16);
3934 ipf_fix_incksum(0, &icmp->icmp_cksum, sumd2, 0);
3935 }
3936 }
3937 } else if (((flags & IPN_ICMPQUERY) != 0) && (dlen >= 8)) {
3938 icmphdr_t *orgicmp;
3939
3940 /*
3941 * XXX - what if this is bogus hl and we go off the end ?
3942 * In this case, ipf_nat_icmperrorlookup() will have
3943 * returned NULL.
3944 */
3945 orgicmp = (icmphdr_t *)dp;
3946
3947 if (odst == 1) {
3948 if (orgicmp->icmp_id != nat->nat_osport) {
3949
3950 /*
3951 * Fix ICMP checksum (of the offening ICMP
3952 * query packet) to compensate the change
3953 * in the ICMP id of the offending ICMP
3954 * packet.
3955 *
3956 * Since you modify orgicmp->icmp_id with
3957 * a delta (say x) and you compensate that
3958 * in origicmp->icmp_cksum with a delta
3959 * minus x, you don't have to adjust the
3960 * overall icmp->icmp_cksum
3961 */
3962 sum1 = ntohs(orgicmp->icmp_id);
3963 sum2 = ntohs(nat->nat_oicmpid);
3964 CALC_SUMD(sum1, sum2, sumd);
3965 orgicmp->icmp_id = nat->nat_oicmpid;
3966 ipf_fix_datacksum(&orgicmp->icmp_cksum, sumd);
3967 }
3968 } /* nat_dir == NAT_INBOUND is impossible for icmp queries */
3969 }
3970 return nat;
3971 }
3972
3973
3974 /*
3975 * MAP-IN MAP-OUT RDR-IN RDR-OUT
3976 * osrc X == src == src X
3977 * odst X == dst == dst X
3978 * nsrc == dst X X == dst
3979 * ndst == src X X == src
3980 * MAP = NAT_OUTBOUND, RDR = NAT_INBOUND
3981 */
3982 /*
3983 * NB: these lookups don't lock access to the list, it assumed that it has
3984 * already been done!
3985 */
3986 /* ------------------------------------------------------------------------ */
3987 /* Function: ipf_nat_inlookup */
3988 /* Returns: nat_t* - NULL == no match, */
3989 /* else pointer to matching NAT entry */
3990 /* Parameters: fin(I) - pointer to packet information */
3991 /* flags(I) - NAT flags for this packet */
3992 /* p(I) - protocol for this packet */
3993 /* src(I) - source IP address */
3994 /* mapdst(I) - destination IP address */
3995 /* */
3996 /* Lookup a nat entry based on the mapped destination ip address/port and */
3997 /* real source address/port. We use this lookup when receiving a packet, */
3998 /* we're looking for a table entry, based on the destination address. */
3999 /* */
4000 /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */
4001 /* */
4002 /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */
4003 /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */
4004 /* */
4005 /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */
4006 /* the packet is of said protocol */
4007 /* ------------------------------------------------------------------------ */
4008 nat_t *
4009 ipf_nat_inlookup(fr_info_t *fin, u_int flags, u_int p, struct in_addr src,
4010 struct in_addr mapdst)
4011 {
4012 ipf_main_softc_t *softc = fin->fin_main_soft;
4013 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
4014 u_short sport, dport;
4015 grehdr_t *gre;
4016 ipnat_t *ipn;
4017 u_int sflags;
4018 nat_t *nat;
4019 int nflags;
4020 u_32_t dst;
4021 void *ifp;
4022 u_int hv, rhv;
4023
4024 ifp = fin->fin_ifp;
4025 gre = NULL;
4026 dst = mapdst.s_addr;
4027 sflags = flags & NAT_TCPUDPICMP;
4028
4029 switch (p)
4030 {
4031 case IPPROTO_TCP :
4032 case IPPROTO_UDP :
4033 sport = htons(fin->fin_data[0]);
4034 dport = htons(fin->fin_data[1]);
4035 break;
4036 case IPPROTO_ICMP :
4037 if (flags & IPN_ICMPERR) {
4038 sport = fin->fin_data[1];
4039 dport = 0;
4040 } else {
4041 dport = fin->fin_data[1];
4042 sport = 0;
4043 }
4044 break;
4045 default :
4046 sport = 0;
4047 dport = 0;
4048 break;
4049 }
4050
4051
4052 if ((flags & SI_WILDP) != 0)
4053 goto find_in_wild_ports;
4054
4055 rhv = NAT_HASH_FN(dst, dport, 0xffffffff);
4056 rhv = NAT_HASH_FN(src.s_addr, rhv + sport, 0xffffffff);
4057 hv = rhv % softn->ipf_nat_table_sz;
4058 nat = softn->ipf_nat_table[1][hv];
4059 /* TRACE dst, dport, src, sport, hv, nat */
4060
4061 for (; nat; nat = nat->nat_hnext[1]) {
4062 if (nat->nat_ifps[0] != NULL) {
4063 if ((ifp != NULL) && (ifp != nat->nat_ifps[0]))
4064 continue;
4065 }
4066
4067 if (nat->nat_pr[0] != p)
4068 continue;
4069
4070 switch (nat->nat_dir)
4071 {
4072 case NAT_INBOUND :
4073 case NAT_DIVERTIN :
4074 if (nat->nat_v[0] != 4)
4075 continue;
4076 if (nat->nat_osrcaddr != src.s_addr ||
4077 nat->nat_odstaddr != dst)
4078 continue;
4079 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
4080 if (nat->nat_osport != sport)
4081 continue;
4082 if (nat->nat_odport != dport)
4083 continue;
4084
4085 } else if (p == IPPROTO_ICMP) {
4086 if (nat->nat_osport != dport) {
4087 continue;
4088 }
4089 }
4090 break;
4091 case NAT_DIVERTOUT :
4092 if (nat->nat_dlocal)
4093 continue;
4094 case NAT_OUTBOUND :
4095 if (nat->nat_v[1] != 4)
4096 continue;
4097 if (nat->nat_dlocal)
4098 continue;
4099 if (nat->nat_dlocal)
4100 continue;
4101 if (nat->nat_ndstaddr != src.s_addr ||
4102 nat->nat_nsrcaddr != dst)
4103 continue;
4104 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
4105 if (nat->nat_ndport != sport)
4106 continue;
4107 if (nat->nat_nsport != dport)
4108 continue;
4109
4110 } else if (p == IPPROTO_ICMP) {
4111 if (nat->nat_osport != dport) {
4112 continue;
4113 }
4114 }
4115 break;
4116 }
4117
4118
4119 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
4120 ipn = nat->nat_ptr;
4121 if ((ipn != NULL) && (nat->nat_aps != NULL))
4122 if (ipf_proxy_match(fin, nat) != 0)
4123 continue;
4124 }
4125 if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) {
4126 nat->nat_ifps[0] = ifp;
4127 nat->nat_mtu[0] = GETIFMTU_4(ifp);
4128 }
4129 return nat;
4130 }
4131
4132 /*
4133 * So if we didn't find it but there are wildcard members in the hash
4134 * table, go back and look for them. We do this search and update here
4135 * because it is modifying the NAT table and we want to do this only
4136 * for the first packet that matches. The exception, of course, is
4137 * for "dummy" (FI_IGNORE) lookups.
4138 */
4139 find_in_wild_ports:
4140 if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) {
4141 NBUMPSIDEX(0, ns_lookup_miss, ns_lookup_miss_0);
4142 return NULL;
4143 }
4144 if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) {
4145 NBUMPSIDEX(0, ns_lookup_nowild, ns_lookup_nowild_0);
4146 return NULL;
4147 }
4148
4149 RWLOCK_EXIT(&softc->ipf_nat);
4150
4151 hv = NAT_HASH_FN(dst, 0, 0xffffffff);
4152 hv = NAT_HASH_FN(src.s_addr, hv, softn->ipf_nat_table_sz);
4153 WRITE_ENTER(&softc->ipf_nat);
4154
4155 nat = softn->ipf_nat_table[1][hv];
4156 /* TRACE dst, src, hv, nat */
4157 for (; nat; nat = nat->nat_hnext[1]) {
4158 if (nat->nat_ifps[0] != NULL) {
4159 if ((ifp != NULL) && (ifp != nat->nat_ifps[0]))
4160 continue;
4161 }
4162
4163 if (nat->nat_pr[0] != fin->fin_p)
4164 continue;
4165
4166 switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND))
4167 {
4168 case NAT_INBOUND :
4169 if (nat->nat_v[0] != 4)
4170 continue;
4171 if (nat->nat_osrcaddr != src.s_addr ||
4172 nat->nat_odstaddr != dst)
4173 continue;
4174 break;
4175 case NAT_OUTBOUND :
4176 if (nat->nat_v[1] != 4)
4177 continue;
4178 if (nat->nat_ndstaddr != src.s_addr ||
4179 nat->nat_nsrcaddr != dst)
4180 continue;
4181 break;
4182 }
4183
4184 nflags = nat->nat_flags;
4185 if (!(nflags & (NAT_TCPUDP|SI_WILDP)))
4186 continue;
4187
4188 if (ipf_nat_wildok(nat, (int)sport, (int)dport, nflags,
4189 NAT_INBOUND) == 1) {
4190 if ((fin->fin_flx & FI_IGNORE) != 0)
4191 break;
4192 if ((nflags & SI_CLONE) != 0) {
4193 nat = ipf_nat_clone(fin, nat);
4194 if (nat == NULL)
4195 break;
4196 } else {
4197 MUTEX_ENTER(&softn->ipf_nat_new);
4198 softn->ipf_nat_stats.ns_wilds--;
4199 MUTEX_EXIT(&softn->ipf_nat_new);
4200 }
4201
4202 if (nat->nat_dir == NAT_INBOUND) {
4203 if (nat->nat_osport == 0) {
4204 nat->nat_osport = sport;
4205 nat->nat_nsport = sport;
4206 }
4207 if (nat->nat_odport == 0) {
4208 nat->nat_odport = dport;
4209 nat->nat_ndport = dport;
4210 }
4211 } else if (nat->nat_dir == NAT_OUTBOUND) {
4212 if (nat->nat_osport == 0) {
4213 nat->nat_osport = dport;
4214 nat->nat_nsport = dport;
4215 }
4216 if (nat->nat_odport == 0) {
4217 nat->nat_odport = sport;
4218 nat->nat_ndport = sport;
4219 }
4220 }
4221 if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) {
4222 nat->nat_ifps[0] = ifp;
4223 nat->nat_mtu[0] = GETIFMTU_4(ifp);
4224 }
4225 nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT);
4226 ipf_nat_tabmove(softn, nat);
4227 break;
4228 }
4229 }
4230
4231 MUTEX_DOWNGRADE(&softc->ipf_nat);
4232
4233 if (nat == NULL) {
4234 NBUMPSIDE(0, ns_lookup_miss);
4235 }
4236 return nat;
4237 }
4238
4239
4240 /* ------------------------------------------------------------------------ */
4241 /* Function: ipf_nat_tabmove */
4242 /* Returns: Nil */
4243 /* Parameters: softn(I) - pointer to NAT context structure */
4244 /* nat(I) - pointer to NAT structure */
4245 /* Write Lock: ipf_nat */
4246 /* */
4247 /* This function is only called for TCP/UDP NAT table entries where the */
4248 /* original was placed in the table without hashing on the ports and we now */
4249 /* want to include hashing on port numbers. */
4250 /* ------------------------------------------------------------------------ */
4251 static void
4252 ipf_nat_tabmove(ipf_nat_softc_t *softn, nat_t *nat)
4253 {
4254 u_int hv0, hv1, rhv0, rhv1;
4255 natstat_t *nsp;
4256 nat_t **natp;
4257
4258 if (nat->nat_flags & SI_CLONE)
4259 return;
4260
4261 nsp = &softn->ipf_nat_stats;
4262 /*
4263 * Remove the NAT entry from the old location
4264 */
4265 if (nat->nat_hnext[0])
4266 nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0];
4267 *nat->nat_phnext[0] = nat->nat_hnext[0];
4268 nsp->ns_side[0].ns_bucketlen[nat->nat_hv[0] %
4269 softn->ipf_nat_table_sz]--;
4270
4271 if (nat->nat_hnext[1])
4272 nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1];
4273 *nat->nat_phnext[1] = nat->nat_hnext[1];
4274 nsp->ns_side[1].ns_bucketlen[nat->nat_hv[1] %
4275 softn->ipf_nat_table_sz]--;
4276
4277 /*
4278 * Add into the NAT table in the new position
4279 */
4280 rhv0 = NAT_HASH_FN(nat->nat_osrcaddr, nat->nat_osport, 0xffffffff);
4281 rhv0 = NAT_HASH_FN(nat->nat_odstaddr, rhv0 + nat->nat_odport,
4282 0xffffffff);
4283 rhv1 = NAT_HASH_FN(nat->nat_nsrcaddr, nat->nat_nsport, 0xffffffff);
4284 rhv1 = NAT_HASH_FN(nat->nat_ndstaddr, rhv1 + nat->nat_ndport,
4285 0xffffffff);
4286
4287 hv0 = rhv0 % softn->ipf_nat_table_sz;
4288 hv1 = rhv1 % softn->ipf_nat_table_sz;
4289
4290 if (nat->nat_dir == NAT_INBOUND || nat->nat_dir == NAT_DIVERTIN) {
4291 u_int swap;
4292
4293 swap = hv0;
4294 hv0 = hv1;
4295 hv1 = swap;
4296 }
4297
4298 /* TRACE nat_osrcaddr, nat_osport, nat_odstaddr, nat_odport, hv0 */
4299 /* TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr, nat_ndport, hv1 */
4300
4301 nat->nat_hv[0] = rhv0;
4302 natp = &softn->ipf_nat_table[0][hv0];
4303 if (*natp)
4304 (*natp)->nat_phnext[0] = &nat->nat_hnext[0];
4305 nat->nat_phnext[0] = natp;
4306 nat->nat_hnext[0] = *natp;
4307 *natp = nat;
4308 nsp->ns_side[0].ns_bucketlen[hv0]++;
4309
4310 nat->nat_hv[1] = rhv1;
4311 natp = &softn->ipf_nat_table[1][hv1];
4312 if (*natp)
4313 (*natp)->nat_phnext[1] = &nat->nat_hnext[1];
4314 nat->nat_phnext[1] = natp;
4315 nat->nat_hnext[1] = *natp;
4316 *natp = nat;
4317 nsp->ns_side[1].ns_bucketlen[hv1]++;
4318 }
4319
4320
4321 /* ------------------------------------------------------------------------ */
4322 /* Function: ipf_nat_outlookup */
4323 /* Returns: nat_t* - NULL == no match, */
4324 /* else pointer to matching NAT entry */
4325 /* Parameters: fin(I) - pointer to packet information */
4326 /* flags(I) - NAT flags for this packet */
4327 /* p(I) - protocol for this packet */
4328 /* src(I) - source IP address */
4329 /* dst(I) - destination IP address */
4330 /* rw(I) - 1 == write lock on held, 0 == read lock. */
4331 /* */
4332 /* Lookup a nat entry based on the source 'real' ip address/port and */
4333 /* destination address/port. We use this lookup when sending a packet out, */
4334 /* we're looking for a table entry, based on the source address. */
4335 /* */
4336 /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */
4337 /* */
4338 /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */
4339 /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */
4340 /* */
4341 /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */
4342 /* the packet is of said protocol */
4343 /* ------------------------------------------------------------------------ */
4344 nat_t *
4345 ipf_nat_outlookup(fr_info_t *fin, u_int flags, u_int p, struct in_addr src,
4346 struct in_addr dst)
4347 {
4348 ipf_main_softc_t *softc = fin->fin_main_soft;
4349 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
4350 u_short sport, dport;
4351 u_int sflags;
4352 ipnat_t *ipn;
4353 nat_t *nat;
4354 void *ifp;
4355 u_int hv;
4356
4357 ifp = fin->fin_ifp;
4358 sflags = flags & IPN_TCPUDPICMP;
4359 sport = 0;
4360 dport = 0;
4361
4362 switch (p)
4363 {
4364 case IPPROTO_TCP :
4365 case IPPROTO_UDP :
4366 sport = htons(fin->fin_data[0]);
4367 dport = htons(fin->fin_data[1]);
4368 break;
4369 case IPPROTO_ICMP :
4370 if (flags & IPN_ICMPERR)
4371 sport = fin->fin_data[1];
4372 else
4373 dport = fin->fin_data[1];
4374 break;
4375 default :
4376 break;
4377 }
4378
4379 if ((flags & SI_WILDP) != 0)
4380 goto find_out_wild_ports;
4381
4382 hv = NAT_HASH_FN(src.s_addr, sport, 0xffffffff);
4383 hv = NAT_HASH_FN(dst.s_addr, hv + dport, softn->ipf_nat_table_sz);
4384 nat = softn->ipf_nat_table[0][hv];
4385
4386 /* TRACE src, sport, dst, dport, hv, nat */
4387
4388 for (; nat; nat = nat->nat_hnext[0]) {
4389 if (nat->nat_ifps[1] != NULL) {
4390 if ((ifp != NULL) && (ifp != nat->nat_ifps[1]))
4391 continue;
4392 }
4393
4394 if (nat->nat_pr[1] != p)
4395 continue;
4396
4397 switch (nat->nat_dir)
4398 {
4399 case NAT_INBOUND :
4400 case NAT_DIVERTIN :
4401 if (nat->nat_v[1] != 4)
4402 continue;
4403 if (nat->nat_ndstaddr != src.s_addr ||
4404 nat->nat_nsrcaddr != dst.s_addr)
4405 continue;
4406
4407 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
4408 if (nat->nat_ndport != sport)
4409 continue;
4410 if (nat->nat_nsport != dport)
4411 continue;
4412
4413 } else if (p == IPPROTO_ICMP) {
4414 if (nat->nat_osport != dport) {
4415 continue;
4416 }
4417 }
4418 break;
4419 case NAT_OUTBOUND :
4420 case NAT_DIVERTOUT :
4421 if (nat->nat_v[0] != 4)
4422 continue;
4423 if (nat->nat_osrcaddr != src.s_addr ||
4424 nat->nat_odstaddr != dst.s_addr)
4425 continue;
4426
4427 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
4428 if (nat->nat_odport != dport)
4429 continue;
4430 if (nat->nat_osport != sport)
4431 continue;
4432
4433 } else if (p == IPPROTO_ICMP) {
4434 if (nat->nat_osport != dport) {
4435 continue;
4436 }
4437 }
4438 break;
4439 }
4440
4441 ipn = nat->nat_ptr;
4442 if ((ipn != NULL) && (nat->nat_aps != NULL))
4443 if (ipf_proxy_match(fin, nat) != 0)
4444 continue;
4445
4446 if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) {
4447 nat->nat_ifps[1] = ifp;
4448 nat->nat_mtu[1] = GETIFMTU_4(ifp);
4449 }
4450 return nat;
4451 }
4452
4453 /*
4454 * So if we didn't find it but there are wildcard members in the hash
4455 * table, go back and look for them. We do this search and update here
4456 * because it is modifying the NAT table and we want to do this only
4457 * for the first packet that matches. The exception, of course, is
4458 * for "dummy" (FI_IGNORE) lookups.
4459 */
4460 find_out_wild_ports:
4461 if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) {
4462 NBUMPSIDEX(1, ns_lookup_miss, ns_lookup_miss_1);
4463 return NULL;
4464 }
4465 if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) {
4466 NBUMPSIDEX(1, ns_lookup_nowild, ns_lookup_nowild_1);
4467 return NULL;
4468 }
4469
4470 RWLOCK_EXIT(&softc->ipf_nat);
4471
4472 hv = NAT_HASH_FN(src.s_addr, 0, 0xffffffff);
4473 hv = NAT_HASH_FN(dst.s_addr, hv, softn->ipf_nat_table_sz);
4474
4475 WRITE_ENTER(&softc->ipf_nat);
4476
4477 nat = softn->ipf_nat_table[0][hv];
4478 for (; nat; nat = nat->nat_hnext[0]) {
4479 if (nat->nat_ifps[1] != NULL) {
4480 if ((ifp != NULL) && (ifp != nat->nat_ifps[1]))
4481 continue;
4482 }
4483
4484 if (nat->nat_pr[1] != fin->fin_p)
4485 continue;
4486
4487 switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND))
4488 {
4489 case NAT_INBOUND :
4490 if (nat->nat_v[1] != 4)
4491 continue;
4492 if (nat->nat_ndstaddr != src.s_addr ||
4493 nat->nat_nsrcaddr != dst.s_addr)
4494 continue;
4495 break;
4496 case NAT_OUTBOUND :
4497 if (nat->nat_v[0] != 4)
4498 continue;
4499 if (nat->nat_osrcaddr != src.s_addr ||
4500 nat->nat_odstaddr != dst.s_addr)
4501 continue;
4502 break;
4503 }
4504
4505 if (!(nat->nat_flags & (NAT_TCPUDP|SI_WILDP)))
4506 continue;
4507
4508 if (ipf_nat_wildok(nat, (int)sport, (int)dport, nat->nat_flags,
4509 NAT_OUTBOUND) == 1) {
4510 if ((fin->fin_flx & FI_IGNORE) != 0)
4511 break;
4512 if ((nat->nat_flags & SI_CLONE) != 0) {
4513 nat = ipf_nat_clone(fin, nat);
4514 if (nat == NULL)
4515 break;
4516 } else {
4517 MUTEX_ENTER(&softn->ipf_nat_new);
4518 softn->ipf_nat_stats.ns_wilds--;
4519 MUTEX_EXIT(&softn->ipf_nat_new);
4520 }
4521
4522 if (nat->nat_dir == NAT_OUTBOUND) {
4523 if (nat->nat_osport == 0) {
4524 nat->nat_osport = sport;
4525 nat->nat_nsport = sport;
4526 }
4527 if (nat->nat_odport == 0) {
4528 nat->nat_odport = dport;
4529 nat->nat_ndport = dport;
4530 }
4531 } else if (nat->nat_dir == NAT_INBOUND) {
4532 if (nat->nat_osport == 0) {
4533 nat->nat_osport = dport;
4534 nat->nat_nsport = dport;
4535 }
4536 if (nat->nat_odport == 0) {
4537 nat->nat_odport = sport;
4538 nat->nat_ndport = sport;
4539 }
4540 }
4541 if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) {
4542 nat->nat_ifps[1] = ifp;
4543 nat->nat_mtu[1] = GETIFMTU_4(ifp);
4544 }
4545 nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT);
4546 ipf_nat_tabmove(softn, nat);
4547 break;
4548 }
4549 }
4550
4551 MUTEX_DOWNGRADE(&softc->ipf_nat);
4552
4553 if (nat == NULL) {
4554 NBUMPSIDE(1, ns_lookup_miss);
4555 }
4556 return nat;
4557 }
4558
4559
4560 /* ------------------------------------------------------------------------ */
4561 /* Function: ipf_nat_lookupredir */
4562 /* Returns: nat_t* - NULL == no match, */
4563 /* else pointer to matching NAT entry */
4564 /* Parameters: np(I) - pointer to description of packet to find NAT table */
4565 /* entry for. */
4566 /* */
4567 /* Lookup the NAT tables to search for a matching redirect */
4568 /* The contents of natlookup_t should imitate those found in a packet that */
4569 /* would be translated - ie a packet coming in for RDR or going out for MAP.*/
4570 /* We can do the lookup in one of two ways, imitating an inbound or */
4571 /* outbound packet. By default we assume outbound, unless IPN_IN is set. */
4572 /* For IN, the fields are set as follows: */
4573 /* nl_real* = source information */
4574 /* nl_out* = destination information (translated) */
4575 /* For an out packet, the fields are set like this: */
4576 /* nl_in* = source information (untranslated) */
4577 /* nl_out* = destination information (translated) */
4578 /* ------------------------------------------------------------------------ */
4579 nat_t *
4580 ipf_nat_lookupredir(natlookup_t *np)
4581 {
4582 fr_info_t fi;
4583 nat_t *nat;
4584
4585 bzero((char *)&fi, sizeof(fi));
4586 if (np->nl_flags & IPN_IN) {
4587 fi.fin_data[0] = ntohs(np->nl_realport);
4588 fi.fin_data[1] = ntohs(np->nl_outport);
4589 } else {
4590 fi.fin_data[0] = ntohs(np->nl_inport);
4591 fi.fin_data[1] = ntohs(np->nl_outport);
4592 }
4593 if (np->nl_flags & IPN_TCP)
4594 fi.fin_p = IPPROTO_TCP;
4595 else if (np->nl_flags & IPN_UDP)
4596 fi.fin_p = IPPROTO_UDP;
4597 else if (np->nl_flags & (IPN_ICMPERR|IPN_ICMPQUERY))
4598 fi.fin_p = IPPROTO_ICMP;
4599
4600 /*
4601 * We can do two sorts of lookups:
4602 * - IPN_IN: we have the `real' and `out' address, look for `in'.
4603 * - default: we have the `in' and `out' address, look for `real'.
4604 */
4605 if (np->nl_flags & IPN_IN) {
4606 if ((nat = ipf_nat_inlookup(&fi, np->nl_flags, fi.fin_p,
4607 np->nl_realip, np->nl_outip))) {
4608 np->nl_inip = nat->nat_odstip;
4609 np->nl_inport = nat->nat_odport;
4610 }
4611 } else {
4612 /*
4613 * If nl_inip is non null, this is a lookup based on the real
4614 * ip address. Else, we use the fake.
4615 */
4616 if ((nat = ipf_nat_outlookup(&fi, np->nl_flags, fi.fin_p,
4617 np->nl_inip, np->nl_outip))) {
4618
4619 if ((np->nl_flags & IPN_FINDFORWARD) != 0) {
4620 fr_info_t fin;
4621 bzero((char *)&fin, sizeof(fin));
4622 fin.fin_p = nat->nat_pr[0];
4623 fin.fin_data[0] = ntohs(nat->nat_ndport);
4624 fin.fin_data[1] = ntohs(nat->nat_nsport);
4625 if (ipf_nat_inlookup(&fin, np->nl_flags,
4626 fin.fin_p, nat->nat_ndstip,
4627 nat->nat_nsrcip) != NULL) {
4628 np->nl_flags &= ~IPN_FINDFORWARD;
4629 }
4630 }
4631
4632 np->nl_realip = nat->nat_ndstip;
4633 np->nl_realport = nat->nat_ndport;
4634 }
4635 }
4636
4637 return nat;
4638 }
4639
4640
4641 /* ------------------------------------------------------------------------ */
4642 /* Function: ipf_nat_match */
4643 /* Returns: int - 0 == no match, 1 == match */
4644 /* Parameters: fin(I) - pointer to packet information */
4645 /* np(I) - pointer to NAT rule */
4646 /* */
4647 /* Pull the matching of a packet against a NAT rule out of that complex */
4648 /* loop inside ipf_nat_checkin() and lay it out properly in its own function. */
4649 /* ------------------------------------------------------------------------ */
4650 static int
4651 ipf_nat_match(fr_info_t *fin, ipnat_t *np)
4652 {
4653 ipf_main_softc_t *softc = fin->fin_main_soft;
4654 frtuc_t *ft;
4655 int match;
4656
4657 match = 0;
4658 switch (np->in_osrcatype)
4659 {
4660 case FRI_NORMAL :
4661 match = ((fin->fin_saddr & np->in_osrcmsk) != np->in_osrcaddr);
4662 break;
4663 case FRI_LOOKUP :
4664 match = (*np->in_osrcfunc)(softc, np->in_osrcptr,
4665 4, &fin->fin_saddr, fin->fin_plen);
4666 break;
4667 }
4668 match ^= ((np->in_flags & IPN_NOTSRC) != 0);
4669 if (match)
4670 return 0;
4671
4672 match = 0;
4673 switch (np->in_odstatype)
4674 {
4675 case FRI_NORMAL :
4676 match = ((fin->fin_daddr & np->in_odstmsk) != np->in_odstaddr);
4677 break;
4678 case FRI_LOOKUP :
4679 match = (*np->in_odstfunc)(softc, np->in_odstptr,
4680 4, &fin->fin_daddr, fin->fin_plen);
4681 break;
4682 }
4683
4684 match ^= ((np->in_flags & IPN_NOTDST) != 0);
4685 if (match)
4686 return 0;
4687
4688 ft = &np->in_tuc;
4689 if (!(fin->fin_flx & FI_TCPUDP) ||
4690 (fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) {
4691 if (ft->ftu_scmp || ft->ftu_dcmp)
4692 return 0;
4693 return 1;
4694 }
4695
4696 return ipf_tcpudpchk(&fin->fin_fi, ft);
4697 }
4698
4699
4700 /* ------------------------------------------------------------------------ */
4701 /* Function: ipf_nat_update */
4702 /* Returns: Nil */
4703 /* Parameters: fin(I) - pointer to packet information */
4704 /* nat(I) - pointer to NAT structure */
4705 /* */
4706 /* Updates the lifetime of a NAT table entry for non-TCP packets. Must be */
4707 /* called with fin_rev updated - i.e. after calling ipf_nat_proto(). */
4708 /* */
4709 /* This *MUST* be called after ipf_nat_proto() as it expects fin_rev to */
4710 /* already be set. */
4711 /* ------------------------------------------------------------------------ */
4712 void
4713 ipf_nat_update(fr_info_t *fin, nat_t *nat)
4714 {
4715 ipf_main_softc_t *softc = fin->fin_main_soft;
4716 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
4717 ipftq_t *ifq, *ifq2;
4718 ipftqent_t *tqe;
4719 ipnat_t *np = nat->nat_ptr;
4720
4721 tqe = &nat->nat_tqe;
4722 ifq = tqe->tqe_ifq;
4723
4724 /*
4725 * We allow over-riding of NAT timeouts from NAT rules, even for
4726 * TCP, however, if it is TCP and there is no rule timeout set,
4727 * then do not update the timeout here.
4728 */
4729 if (np != NULL) {
4730 np->in_bytes[fin->fin_rev] += fin->fin_plen;
4731 ifq2 = np->in_tqehead[fin->fin_rev];
4732 } else {
4733 ifq2 = NULL;
4734 }
4735
4736 if (nat->nat_pr[0] == IPPROTO_TCP && ifq2 == NULL) {
4737 (void) ipf_tcp_age(&nat->nat_tqe, fin, softn->ipf_nat_tcptq,
4738 0, 2);
4739 } else {
4740 if (ifq2 == NULL) {
4741 if (nat->nat_pr[0] == IPPROTO_UDP)
4742 ifq2 = fin->fin_rev ? &softn->ipf_nat_udpacktq :
4743 &softn->ipf_nat_udptq;
4744 else if (nat->nat_pr[0] == IPPROTO_ICMP ||
4745 nat->nat_pr[0] == IPPROTO_ICMPV6)
4746 ifq2 = fin->fin_rev ? &softn->ipf_nat_icmpacktq:
4747 &softn->ipf_nat_icmptq;
4748 else
4749 ifq2 = &softn->ipf_nat_iptq;
4750 }
4751
4752 ipf_movequeue(softc->ipf_ticks, tqe, ifq, ifq2);
4753 }
4754 }
4755
4756
4757 /* ------------------------------------------------------------------------ */
4758 /* Function: ipf_nat_checkout */
4759 /* Returns: int - -1 == packet failed NAT checks so block it, */
4760 /* 0 == no packet translation occurred, */
4761 /* 1 == packet was successfully translated. */
4762 /* Parameters: fin(I) - pointer to packet information */
4763 /* passp(I) - pointer to filtering result flags */
4764 /* */
4765 /* Check to see if an outcoming packet should be changed. ICMP packets are */
4766 /* first checked to see if they match an existing entry (if an error), */
4767 /* otherwise a search of the current NAT table is made. If neither results */
4768 /* in a match then a search for a matching NAT rule is made. Create a new */
4769 /* NAT entry if a we matched a NAT rule. Lastly, actually change the */
4770 /* packet header(s) as required. */
4771 /* ------------------------------------------------------------------------ */
4772 int
4773 ipf_nat_checkout(fr_info_t *fin, u_32_t *passp)
4774 {
4775 ipnat_t *np = NULL, *npnext;
4776 struct ifnet *ifp, *sifp;
4777 ipf_main_softc_t *softc;
4778 ipf_nat_softc_t *softn;
4779 icmphdr_t *icmp = NULL;
4780 tcphdr_t *tcp = NULL;
4781 int rval, natfailed;
4782 u_int nflags = 0;
4783 u_32_t ipa, iph;
4784 int natadd = 1;
4785 frentry_t *fr;
4786 nat_t *nat;
4787
4788 if (fin->fin_v == 6) {
4789 #ifdef USE_INET6
4790 return ipf_nat6_checkout(fin, passp);
4791 #else
4792 return 0;
4793 #endif
4794 }
4795
4796 softc = fin->fin_main_soft;
4797 softn = softc->ipf_nat_soft;
4798
4799 if (softn->ipf_nat_lock != 0)
4800 return 0;
4801 if (softn->ipf_nat_stats.ns_rules == 0 &&
4802 softn->ipf_nat_instances == NULL)
4803 return 0;
4804
4805 natfailed = 0;
4806 fr = fin->fin_fr;
4807 sifp = fin->fin_ifp;
4808 if (fr != NULL) {
4809 ifp = fr->fr_tifs[fin->fin_rev].fd_ptr;
4810 if ((ifp != NULL) && (ifp != (void *)-1))
4811 fin->fin_ifp = ifp;
4812 }
4813 ifp = fin->fin_ifp;
4814
4815 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) {
4816 switch (fin->fin_p)
4817 {
4818 case IPPROTO_TCP :
4819 nflags = IPN_TCP;
4820 break;
4821 case IPPROTO_UDP :
4822 nflags = IPN_UDP;
4823 break;
4824 case IPPROTO_ICMP :
4825 icmp = fin->fin_dp;
4826
4827 /*
4828 * This is an incoming packet, so the destination is
4829 * the icmp_id and the source port equals 0
4830 */
4831 if ((fin->fin_flx & FI_ICMPQUERY) != 0)
4832 nflags = IPN_ICMPQUERY;
4833 break;
4834 default :
4835 break;
4836 }
4837
4838 if ((nflags & IPN_TCPUDP))
4839 tcp = fin->fin_dp;
4840 }
4841
4842 ipa = fin->fin_saddr;
4843
4844 READ_ENTER(&softc->ipf_nat);
4845
4846 if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) &&
4847 (nat = ipf_nat_icmperror(fin, &nflags, NAT_OUTBOUND)))
4848 /*EMPTY*/;
4849 else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin)))
4850 natadd = 0;
4851 else if ((nat = ipf_nat_outlookup(fin, nflags|NAT_SEARCH,
4852 (u_int)fin->fin_p, fin->fin_src,
4853 fin->fin_dst))) {
4854 nflags = nat->nat_flags;
4855 } else if (fin->fin_off == 0) {
4856 u_32_t hv, msk, nmsk = 0;
4857
4858 /*
4859 * If there is no current entry in the nat table for this IP#,
4860 * create one for it (if there is a matching rule).
4861 */
4862 maskloop:
4863 msk = softn->ipf_nat_map_active_masks[nmsk];
4864 iph = ipa & msk;
4865 hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_maprules_sz);
4866 retry_roundrobin:
4867 for (np = softn->ipf_nat_map_rules[hv]; np; np = npnext) {
4868 npnext = np->in_mnext;
4869 if ((np->in_ifps[1] && (np->in_ifps[1] != ifp)))
4870 continue;
4871 if (np->in_v[0] != 4)
4872 continue;
4873 if (np->in_pr[1] && (np->in_pr[1] != fin->fin_p))
4874 continue;
4875 if ((np->in_flags & IPN_RF) &&
4876 !(np->in_flags & nflags))
4877 continue;
4878 if (np->in_flags & IPN_FILTER) {
4879 switch (ipf_nat_match(fin, np))
4880 {
4881 case 0 :
4882 continue;
4883 case -1 :
4884 rval = -1;
4885 goto outmatchfail;
4886 case 1 :
4887 default :
4888 break;
4889 }
4890 } else if ((ipa & np->in_osrcmsk) != np->in_osrcaddr)
4891 continue;
4892
4893 if ((fr != NULL) &&
4894 !ipf_matchtag(&np->in_tag, &fr->fr_nattag))
4895 continue;
4896
4897 if (np->in_plabel != -1) {
4898 if (((np->in_flags & IPN_FILTER) == 0) &&
4899 (np->in_odport != fin->fin_data[1]))
4900 continue;
4901 if (ipf_proxy_ok(fin, tcp, np) == 0)
4902 continue;
4903 }
4904
4905 if (np->in_flags & IPN_NO) {
4906 np->in_hits++;
4907 break;
4908 }
4909 MUTEX_ENTER(&softn->ipf_nat_new);
4910 /*
4911 * If we've matched a round-robin rule but it has
4912 * moved in the list since we got it, start over as
4913 * this is now no longer correct.
4914 */
4915 if (npnext != np->in_mnext) {
4916 if ((np->in_flags & IPN_ROUNDR) != 0) {
4917 MUTEX_EXIT(&softn->ipf_nat_new);
4918 goto retry_roundrobin;
4919 }
4920 npnext = np->in_mnext;
4921 }
4922
4923 nat = ipf_nat_add(fin, np, NULL, nflags, NAT_OUTBOUND);
4924 MUTEX_EXIT(&softn->ipf_nat_new);
4925 if (nat != NULL) {
4926 natfailed = 0;
4927 break;
4928 }
4929 natfailed = -1;
4930 }
4931 if ((np == NULL) && (nmsk < softn->ipf_nat_map_max)) {
4932 nmsk++;
4933 goto maskloop;
4934 }
4935 }
4936
4937 if (nat != NULL) {
4938 rval = ipf_nat_out(fin, nat, natadd, nflags);
4939 if (rval == 1) {
4940 MUTEX_ENTER(&nat->nat_lock);
4941 ipf_nat_update(fin, nat);
4942 nat->nat_bytes[1] += fin->fin_plen;
4943 nat->nat_pkts[1]++;
4944 fin->fin_pktnum = nat->nat_pkts[1];
4945 MUTEX_EXIT(&nat->nat_lock);
4946 }
4947 } else
4948 rval = natfailed;
4949 outmatchfail:
4950 RWLOCK_EXIT(&softc->ipf_nat);
4951
4952 switch (rval)
4953 {
4954 case -1 :
4955 if (passp != NULL) {
4956 DT1(frb_natv4out, fr_info_t *, fin);
4957 NBUMPSIDED(1, ns_drop);
4958 *passp = FR_BLOCK;
4959 fin->fin_reason = FRB_NATV4;
4960 }
4961 fin->fin_flx |= FI_BADNAT;
4962 NBUMPSIDED(1, ns_badnat);
4963 break;
4964 case 0 :
4965 NBUMPSIDE(1, ns_ignored);
4966 break;
4967 case 1 :
4968 NBUMPSIDE(1, ns_translated);
4969 break;
4970 }
4971 fin->fin_ifp = sifp;
4972 return rval;
4973 }
4974
4975 /* ------------------------------------------------------------------------ */
4976 /* Function: ipf_nat_out */
4977 /* Returns: int - -1 == packet failed NAT checks so block it, */
4978 /* 1 == packet was successfully translated. */
4979 /* Parameters: fin(I) - pointer to packet information */
4980 /* nat(I) - pointer to NAT structure */
4981 /* natadd(I) - flag indicating if it is safe to add frag cache */
4982 /* nflags(I) - NAT flags set for this packet */
4983 /* */
4984 /* Translate a packet coming "out" on an interface. */
4985 /* ------------------------------------------------------------------------ */
4986 int
4987 ipf_nat_out(fr_info_t *fin, nat_t *nat, int natadd, u_32_t nflags)
4988 {
4989 ipf_main_softc_t *softc = fin->fin_main_soft;
4990 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
4991 icmphdr_t *icmp;
4992 tcphdr_t *tcp;
4993 ipnat_t *np;
4994 int skip;
4995 int i;
4996
4997 tcp = NULL;
4998 icmp = NULL;
4999 np = nat->nat_ptr;
5000
5001 if ((natadd != 0) && (fin->fin_flx & FI_FRAG) && (np != NULL))
5002 (void) ipf_frag_natnew(softc, fin, 0, nat);
5003
5004 /*
5005 * Fix up checksums, not by recalculating them, but
5006 * simply computing adjustments.
5007 * This is only done for STREAMS based IP implementations where the
5008 * checksum has already been calculated by IP. In all other cases,
5009 * IPFilter is called before the checksum needs calculating so there
5010 * is no call to modify whatever is in the header now.
5011 */
5012 if (nflags == IPN_ICMPERR) {
5013 u_32_t s1, s2, sumd, msumd;
5014
5015 s1 = LONG_SUM(ntohl(fin->fin_saddr));
5016 if (nat->nat_dir == NAT_OUTBOUND) {
5017 s2 = LONG_SUM(ntohl(nat->nat_nsrcaddr));
5018 } else {
5019 s2 = LONG_SUM(ntohl(nat->nat_odstaddr));
5020 }
5021 CALC_SUMD(s1, s2, sumd);
5022 msumd = sumd;
5023
5024 s1 = LONG_SUM(ntohl(fin->fin_daddr));
5025 if (nat->nat_dir == NAT_OUTBOUND) {
5026 s2 = LONG_SUM(ntohl(nat->nat_ndstaddr));
5027 } else {
5028 s2 = LONG_SUM(ntohl(nat->nat_osrcaddr));
5029 }
5030 CALC_SUMD(s1, s2, sumd);
5031 msumd += sumd;
5032
5033 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, msumd, 0);
5034 }
5035 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \
5036 defined(linux) || defined(BRIDGE_IPF)
5037 else {
5038 /*
5039 * Strictly speaking, this isn't necessary on BSD
5040 * kernels because they do checksum calculation after
5041 * this code has run BUT if ipfilter is being used
5042 * to do NAT as a bridge, that code doesn't exist.
5043 */
5044 switch (nat->nat_dir)
5045 {
5046 case NAT_OUTBOUND :
5047 ipf_fix_outcksum(fin->fin_cksum & FI_CK_L4PART,
5048 &fin->fin_ip->ip_sum,
5049 nat->nat_ipsumd, 0);
5050 break;
5051
5052 case NAT_INBOUND :
5053 ipf_fix_incksum(fin->fin_cksum & FI_CK_L4PART,
5054 &fin->fin_ip->ip_sum,
5055 nat->nat_ipsumd, 0);
5056 break;
5057
5058 default :
5059 break;
5060 }
5061 }
5062 #endif
5063
5064 /*
5065 * Address assignment is after the checksum modification because
5066 * we are using the address in the packet for determining the
5067 * correct checksum offset (the ICMP error could be coming from
5068 * anyone...)
5069 */
5070 switch (nat->nat_dir)
5071 {
5072 case NAT_OUTBOUND :
5073 fin->fin_ip->ip_src = nat->nat_nsrcip;
5074 fin->fin_saddr = nat->nat_nsrcaddr;
5075 fin->fin_ip->ip_dst = nat->nat_ndstip;
5076 fin->fin_daddr = nat->nat_ndstaddr;
5077 break;
5078
5079 case NAT_INBOUND :
5080 fin->fin_ip->ip_src = nat->nat_odstip;
5081 fin->fin_saddr = nat->nat_ndstaddr;
5082 fin->fin_ip->ip_dst = nat->nat_osrcip;
5083 fin->fin_daddr = nat->nat_nsrcaddr;
5084 break;
5085
5086 case NAT_DIVERTIN :
5087 {
5088 mb_t *m;
5089
5090 skip = ipf_nat_decap(fin, nat);
5091 if (skip <= 0) {
5092 NBUMPSIDED(1, ns_decap_fail);
5093 return -1;
5094 }
5095
5096 m = fin->fin_m;
5097
5098 #if defined(MENTAT) && defined(_KERNEL)
5099 m->b_rptr += skip;
5100 #else
5101 m->m_data += skip;
5102 m->m_len -= skip;
5103
5104 # ifdef M_PKTHDR
5105 if (m->m_flags & M_PKTHDR)
5106 m->m_pkthdr.len -= skip;
5107 # endif
5108 #endif
5109
5110 MUTEX_ENTER(&nat->nat_lock);
5111 ipf_nat_update(fin, nat);
5112 MUTEX_EXIT(&nat->nat_lock);
5113 fin->fin_flx |= FI_NATED;
5114 if (np != NULL && np->in_tag.ipt_num[0] != 0)
5115 fin->fin_nattag = &np->in_tag;
5116 return 1;
5117 /* NOTREACHED */
5118 }
5119
5120 case NAT_DIVERTOUT :
5121 {
5122 u_32_t s1, s2, sumd;
5123 udphdr_t *uh;
5124 ip_t *ip;
5125 mb_t *m;
5126
5127 m = M_DUP(np->in_divmp);
5128 if (m == NULL) {
5129 NBUMPSIDED(1, ns_divert_dup);
5130 return -1;
5131 }
5132
5133 ip = MTOD(m, ip_t *);
5134 ip->ip_id = htons(ipf_nextipid(fin));
5135 s2 = ntohs(ip->ip_id);
5136
5137 s1 = ip->ip_len;
5138 ip->ip_len = ntohs(ip->ip_len);
5139 ip->ip_len += fin->fin_plen;
5140 ip->ip_len = htons(ip->ip_len);
5141 s2 += ntohs(ip->ip_len);
5142 CALC_SUMD(s1, s2, sumd);
5143
5144 uh = (udphdr_t *)(ip + 1);
5145 uh->uh_ulen += fin->fin_plen;
5146 uh->uh_ulen = htons(uh->uh_ulen);
5147 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \
5148 defined(linux) || defined(BRIDGE_IPF)
5149 ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0);
5150 #endif
5151
5152 PREP_MB_T(fin, m);
5153
5154 fin->fin_src = ip->ip_src;
5155 fin->fin_dst = ip->ip_dst;
5156 fin->fin_ip = ip;
5157 fin->fin_plen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */
5158 fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */
5159
5160 nflags &= ~IPN_TCPUDPICMP;
5161
5162 break;
5163 }
5164
5165 default :
5166 break;
5167 }
5168
5169 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) {
5170 u_short *csump;
5171
5172 if ((nat->nat_nsport != 0) && (nflags & IPN_TCPUDP)) {
5173 tcp = fin->fin_dp;
5174
5175 switch (nat->nat_dir)
5176 {
5177 case NAT_OUTBOUND :
5178 tcp->th_sport = nat->nat_nsport;
5179 fin->fin_data[0] = ntohs(nat->nat_nsport);
5180 tcp->th_dport = nat->nat_ndport;
5181 fin->fin_data[1] = ntohs(nat->nat_ndport);
5182 break;
5183
5184 case NAT_INBOUND :
5185 tcp->th_sport = nat->nat_odport;
5186 fin->fin_data[0] = ntohs(nat->nat_odport);
5187 tcp->th_dport = nat->nat_osport;
5188 fin->fin_data[1] = ntohs(nat->nat_osport);
5189 break;
5190 }
5191 }
5192
5193 if ((nat->nat_nsport != 0) && (nflags & IPN_ICMPQUERY)) {
5194 icmp = fin->fin_dp;
5195 icmp->icmp_id = nat->nat_nicmpid;
5196 }
5197
5198 csump = ipf_nat_proto(fin, nat, nflags);
5199
5200 /*
5201 * The above comments do not hold for layer 4 (or higher)
5202 * checksums...
5203 */
5204 if (csump != NULL) {
5205 if (nat->nat_dir == NAT_OUTBOUND)
5206 ipf_fix_outcksum(fin->fin_cksum, csump,
5207 nat->nat_sumd[0],
5208 nat->nat_sumd[1] +
5209 fin->fin_dlen);
5210 else
5211 ipf_fix_incksum(fin->fin_cksum, csump,
5212 nat->nat_sumd[0],
5213 nat->nat_sumd[1] +
5214 fin->fin_dlen);
5215 }
5216 }
5217
5218 ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync);
5219 /* ------------------------------------------------------------- */
5220 /* A few quick notes: */
5221 /* Following are test conditions prior to calling the */
5222 /* ipf_proxy_check routine. */
5223 /* */
5224 /* A NULL tcp indicates a non TCP/UDP packet. When dealing */
5225 /* with a redirect rule, we attempt to match the packet's */
5226 /* source port against in_dport, otherwise we'd compare the */
5227 /* packet's destination. */
5228 /* ------------------------------------------------------------- */
5229 if ((np != NULL) && (np->in_apr != NULL)) {
5230 i = ipf_proxy_check(fin, nat);
5231 if (i == 0) {
5232 i = 1;
5233 } else if (i == -1) {
5234 NBUMPSIDED(1, ns_ipf_proxy_fail);
5235 }
5236 } else {
5237 i = 1;
5238 }
5239 fin->fin_flx |= FI_NATED;
5240 return i;
5241 }
5242
5243
5244 /* ------------------------------------------------------------------------ */
5245 /* Function: ipf_nat_checkin */
5246 /* Returns: int - -1 == packet failed NAT checks so block it, */
5247 /* 0 == no packet translation occurred, */
5248 /* 1 == packet was successfully translated. */
5249 /* Parameters: fin(I) - pointer to packet information */
5250 /* passp(I) - pointer to filtering result flags */
5251 /* */
5252 /* Check to see if an incoming packet should be changed. ICMP packets are */
5253 /* first checked to see if they match an existing entry (if an error), */
5254 /* otherwise a search of the current NAT table is made. If neither results */
5255 /* in a match then a search for a matching NAT rule is made. Create a new */
5256 /* NAT entry if a we matched a NAT rule. Lastly, actually change the */
5257 /* packet header(s) as required. */
5258 /* ------------------------------------------------------------------------ */
5259 int
5260 ipf_nat_checkin(fr_info_t *fin, u_32_t *passp)
5261 {
5262 ipf_main_softc_t *softc;
5263 ipf_nat_softc_t *softn;
5264 u_int nflags, natadd;
5265 ipnat_t *np, *npnext;
5266 int rval, natfailed;
5267 struct ifnet *ifp;
5268 struct in_addr in;
5269 icmphdr_t *icmp;
5270 tcphdr_t *tcp;
5271 u_short dport;
5272 nat_t *nat;
5273 u_32_t iph;
5274
5275 softc = fin->fin_main_soft;
5276 softn = softc->ipf_nat_soft;
5277
5278 if (softn->ipf_nat_lock != 0)
5279 return 0;
5280 if (softn->ipf_nat_stats.ns_rules == 0 &&
5281 softn->ipf_nat_instances == NULL)
5282 return 0;
5283
5284 tcp = NULL;
5285 icmp = NULL;
5286 dport = 0;
5287 natadd = 1;
5288 nflags = 0;
5289 natfailed = 0;
5290 ifp = fin->fin_ifp;
5291
5292 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) {
5293 switch (fin->fin_p)
5294 {
5295 case IPPROTO_TCP :
5296 nflags = IPN_TCP;
5297 break;
5298 case IPPROTO_UDP :
5299 nflags = IPN_UDP;
5300 break;
5301 case IPPROTO_ICMP :
5302 icmp = fin->fin_dp;
5303
5304 /*
5305 * This is an incoming packet, so the destination is
5306 * the icmp_id and the source port equals 0
5307 */
5308 if ((fin->fin_flx & FI_ICMPQUERY) != 0) {
5309 nflags = IPN_ICMPQUERY;
5310 dport = icmp->icmp_id;
5311 } break;
5312 default :
5313 break;
5314 }
5315
5316 if ((nflags & IPN_TCPUDP)) {
5317 tcp = fin->fin_dp;
5318 dport = fin->fin_data[1];
5319 }
5320 }
5321
5322 in = fin->fin_dst;
5323
5324 READ_ENTER(&softc->ipf_nat);
5325
5326 if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) &&
5327 (nat = ipf_nat_icmperror(fin, &nflags, NAT_INBOUND)))
5328 /*EMPTY*/;
5329 else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin)))
5330 natadd = 0;
5331 else if ((nat = ipf_nat_inlookup(fin, nflags|NAT_SEARCH,
5332 (u_int)fin->fin_p,
5333 fin->fin_src, in))) {
5334 nflags = nat->nat_flags;
5335 } else if (fin->fin_off == 0) {
5336 u_32_t hv, msk, rmsk = 0;
5337
5338 /*
5339 * If there is no current entry in the nat table for this IP#,
5340 * create one for it (if there is a matching rule).
5341 */
5342 maskloop:
5343 msk = softn->ipf_nat_rdr_active_masks[rmsk];
5344 iph = in.s_addr & msk;
5345 hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_rdrrules_sz);
5346 retry_roundrobin:
5347 /* TRACE (iph,msk,rmsk,hv,softn->ipf_nat_rdrrules_sz) */
5348 for (np = softn->ipf_nat_rdr_rules[hv]; np; np = npnext) {
5349 npnext = np->in_rnext;
5350 if (np->in_ifps[0] && (np->in_ifps[0] != ifp))
5351 continue;
5352 if (np->in_v[0] != 4)
5353 continue;
5354 if (np->in_pr[0] && (np->in_pr[0] != fin->fin_p))
5355 continue;
5356 if ((np->in_flags & IPN_RF) && !(np->in_flags & nflags))
5357 continue;
5358 if (np->in_flags & IPN_FILTER) {
5359 switch (ipf_nat_match(fin, np))
5360 {
5361 case 0 :
5362 continue;
5363 case -1 :
5364 rval = -1;
5365 goto inmatchfail;
5366 case 1 :
5367 default :
5368 break;
5369 }
5370 } else {
5371 if ((in.s_addr & np->in_odstmsk) !=
5372 np->in_odstaddr)
5373 continue;
5374 if (np->in_odport &&
5375 ((np->in_dtop < dport) ||
5376 (dport < np->in_odport)))
5377 continue;
5378 }
5379
5380 if (np->in_plabel != -1) {
5381 if (!ipf_proxy_ok(fin, tcp, np)) {
5382 continue;
5383 }
5384 }
5385
5386 if (np->in_flags & IPN_NO) {
5387 np->in_hits++;
5388 break;
5389 }
5390
5391 MUTEX_ENTER(&softn->ipf_nat_new);
5392 /*
5393 * If we've matched a round-robin rule but it has
5394 * moved in the list since we got it, start over as
5395 * this is now no longer correct.
5396 */
5397 if (npnext != np->in_rnext) {
5398 if ((np->in_flags & IPN_ROUNDR) != 0) {
5399 MUTEX_EXIT(&softn->ipf_nat_new);
5400 goto retry_roundrobin;
5401 }
5402 npnext = np->in_rnext;
5403 }
5404
5405 nat = ipf_nat_add(fin, np, NULL, nflags, NAT_INBOUND);
5406 MUTEX_EXIT(&softn->ipf_nat_new);
5407 if (nat != NULL) {
5408 natfailed = 0;
5409 break;
5410 }
5411 natfailed = -1;
5412 }
5413 if ((np == NULL) && (rmsk < softn->ipf_nat_rdr_max)) {
5414 rmsk++;
5415 goto maskloop;
5416 }
5417 }
5418
5419 if (nat != NULL) {
5420 rval = ipf_nat_in(fin, nat, natadd, nflags);
5421 if (rval == 1) {
5422 MUTEX_ENTER(&nat->nat_lock);
5423 ipf_nat_update(fin, nat);
5424 nat->nat_bytes[0] += fin->fin_plen;
5425 nat->nat_pkts[0]++;
5426 fin->fin_pktnum = nat->nat_pkts[0];
5427 MUTEX_EXIT(&nat->nat_lock);
5428 }
5429 } else
5430 rval = natfailed;
5431 inmatchfail:
5432 RWLOCK_EXIT(&softc->ipf_nat);
5433
5434 switch (rval)
5435 {
5436 case -1 :
5437 if (passp != NULL) {
5438 DT1(frb_natv4in, fr_info_t *, fin);
5439 NBUMPSIDED(0, ns_drop);
5440 *passp = FR_BLOCK;
5441 fin->fin_reason = FRB_NATV4;
5442 }
5443 fin->fin_flx |= FI_BADNAT;
5444 NBUMPSIDED(0, ns_badnat);
5445 break;
5446 case 0 :
5447 NBUMPSIDE(0, ns_ignored);
5448 break;
5449 case 1 :
5450 NBUMPSIDE(0, ns_translated);
5451 break;
5452 }
5453 return rval;
5454 }
5455
5456
5457 /* ------------------------------------------------------------------------ */
5458 /* Function: ipf_nat_in */
5459 /* Returns: int - -1 == packet failed NAT checks so block it, */
5460 /* 1 == packet was successfully translated. */
5461 /* Parameters: fin(I) - pointer to packet information */
5462 /* nat(I) - pointer to NAT structure */
5463 /* natadd(I) - flag indicating if it is safe to add frag cache */
5464 /* nflags(I) - NAT flags set for this packet */
5465 /* Locks Held: ipf_nat(READ) */
5466 /* */
5467 /* Translate a packet coming "in" on an interface. */
5468 /* ------------------------------------------------------------------------ */
5469 int
5470 ipf_nat_in(fr_info_t *fin, nat_t *nat, int natadd, u_32_t nflags)
5471 {
5472 ipf_main_softc_t *softc = fin->fin_main_soft;
5473 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
5474 u_32_t sumd, ipsumd, sum1, sum2;
5475 icmphdr_t *icmp;
5476 tcphdr_t *tcp;
5477 ipnat_t *np;
5478 int skip;
5479 int i;
5480
5481 tcp = NULL;
5482 np = nat->nat_ptr;
5483 fin->fin_fr = nat->nat_fr;
5484
5485 if (np != NULL) {
5486 if ((natadd != 0) && (fin->fin_flx & FI_FRAG))
5487 (void) ipf_frag_natnew(softc, fin, 0, nat);
5488
5489 /* ------------------------------------------------------------- */
5490 /* A few quick notes: */
5491 /* Following are test conditions prior to calling the */
5492 /* ipf_proxy_check routine. */
5493 /* */
5494 /* A NULL tcp indicates a non TCP/UDP packet. When dealing */
5495 /* with a map rule, we attempt to match the packet's */
5496 /* source port against in_dport, otherwise we'd compare the */
5497 /* packet's destination. */
5498 /* ------------------------------------------------------------- */
5499 if (np->in_apr != NULL) {
5500 i = ipf_proxy_check(fin, nat);
5501 if (i == -1) {
5502 NBUMPSIDED(0, ns_ipf_proxy_fail);
5503 return -1;
5504 }
5505 }
5506 }
5507
5508 ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync);
5509
5510 ipsumd = nat->nat_ipsumd;
5511 /*
5512 * Fix up checksums, not by recalculating them, but
5513 * simply computing adjustments.
5514 * Why only do this for some platforms on inbound packets ?
5515 * Because for those that it is done, IP processing is yet to happen
5516 * and so the IPv4 header checksum has not yet been evaluated.
5517 * Perhaps it should always be done for the benefit of things like
5518 * fast forwarding (so that it doesn't need to be recomputed) but with
5519 * header checksum offloading, perhaps it is a moot point.
5520 */
5521
5522 switch (nat->nat_dir)
5523 {
5524 case NAT_INBOUND :
5525 if ((fin->fin_flx & FI_ICMPERR) == 0) {
5526 fin->fin_ip->ip_src = nat->nat_nsrcip;
5527 fin->fin_saddr = nat->nat_nsrcaddr;
5528 } else {
5529 sum1 = nat->nat_osrcaddr;
5530 sum2 = nat->nat_nsrcaddr;
5531 CALC_SUMD(sum1, sum2, sumd);
5532 ipsumd -= sumd;
5533 }
5534 fin->fin_ip->ip_dst = nat->nat_ndstip;
5535 fin->fin_daddr = nat->nat_ndstaddr;
5536 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \
5537 defined(__osf__) || defined(linux)
5538 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, ipsumd, 0);
5539 #endif
5540 break;
5541
5542 case NAT_OUTBOUND :
5543 if ((fin->fin_flx & FI_ICMPERR) == 0) {
5544 fin->fin_ip->ip_src = nat->nat_odstip;
5545 fin->fin_saddr = nat->nat_odstaddr;
5546 } else {
5547 sum1 = nat->nat_odstaddr;
5548 sum2 = nat->nat_ndstaddr;
5549 CALC_SUMD(sum1, sum2, sumd);
5550 ipsumd -= sumd;
5551 }
5552 fin->fin_ip->ip_dst = nat->nat_osrcip;
5553 fin->fin_daddr = nat->nat_osrcaddr;
5554 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \
5555 defined(__osf__) || defined(linux)
5556 ipf_fix_incksum(0, &fin->fin_ip->ip_sum, ipsumd, 0);
5557 #endif
5558 break;
5559
5560 case NAT_DIVERTIN :
5561 {
5562 udphdr_t *uh;
5563 ip_t *ip;
5564 mb_t *m;
5565
5566 m = M_DUP(np->in_divmp);
5567 if (m == NULL) {
5568 NBUMPSIDED(0, ns_divert_dup);
5569 return -1;
5570 }
5571
5572 ip = MTOD(m, ip_t *);
5573 ip->ip_id = htons(ipf_nextipid(fin));
5574 sum1 = ntohs(ip->ip_len);
5575 ip->ip_len = ntohs(ip->ip_len);
5576 ip->ip_len += fin->fin_plen;
5577 ip->ip_len = htons(ip->ip_len);
5578
5579 uh = (udphdr_t *)(ip + 1);
5580 uh->uh_ulen += fin->fin_plen;
5581 uh->uh_ulen = htons(uh->uh_ulen);
5582
5583 sum2 = ntohs(ip->ip_id) + ntohs(ip->ip_len);
5584 sum2 += ntohs(ip->ip_off) & IP_DF;
5585 CALC_SUMD(sum1, sum2, sumd);
5586
5587 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \
5588 defined(__osf__) || defined(linux)
5589 ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0);
5590 #endif
5591 PREP_MB_T(fin, m);
5592
5593 fin->fin_ip = ip;
5594 fin->fin_plen += sizeof(ip_t) + 8; /* UDP + new IPv4 hdr */
5595 fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + old IPv4 hdr */
5596
5597 nflags &= ~IPN_TCPUDPICMP;
5598
5599 break;
5600 }
5601
5602 case NAT_DIVERTOUT :
5603 {
5604 mb_t *m;
5605
5606 skip = ipf_nat_decap(fin, nat);
5607 if (skip <= 0) {
5608 NBUMPSIDED(0, ns_decap_fail);
5609 return -1;
5610 }
5611
5612 m = fin->fin_m;
5613
5614 #if defined(MENTAT) && defined(_KERNEL)
5615 m->b_rptr += skip;
5616 #else
5617 m->m_data += skip;
5618 m->m_len -= skip;
5619
5620 # ifdef M_PKTHDR
5621 if (m->m_flags & M_PKTHDR)
5622 m->m_pkthdr.len -= skip;
5623 # endif
5624 #endif
5625
5626 ipf_nat_update(fin, nat);
5627 nflags &= ~IPN_TCPUDPICMP;
5628 fin->fin_flx |= FI_NATED;
5629 if (np != NULL && np->in_tag.ipt_num[0] != 0)
5630 fin->fin_nattag = &np->in_tag;
5631 return 1;
5632 /* NOTREACHED */
5633 }
5634 }
5635 if (nflags & IPN_TCPUDP)
5636 tcp = fin->fin_dp;
5637
5638 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) {
5639 u_short *csump;
5640
5641 if ((nat->nat_odport != 0) && (nflags & IPN_TCPUDP)) {
5642 switch (nat->nat_dir)
5643 {
5644 case NAT_INBOUND :
5645 tcp->th_sport = nat->nat_nsport;
5646 fin->fin_data[0] = ntohs(nat->nat_nsport);
5647 tcp->th_dport = nat->nat_ndport;
5648 fin->fin_data[1] = ntohs(nat->nat_ndport);
5649 break;
5650
5651 case NAT_OUTBOUND :
5652 tcp->th_sport = nat->nat_odport;
5653 fin->fin_data[0] = ntohs(nat->nat_odport);
5654 tcp->th_dport = nat->nat_osport;
5655 fin->fin_data[1] = ntohs(nat->nat_osport);
5656 break;
5657 }
5658 }
5659
5660
5661 if ((nat->nat_odport != 0) && (nflags & IPN_ICMPQUERY)) {
5662 icmp = fin->fin_dp;
5663
5664 icmp->icmp_id = nat->nat_nicmpid;
5665 }
5666
5667 csump = ipf_nat_proto(fin, nat, nflags);
5668
5669 /*
5670 * The above comments do not hold for layer 4 (or higher)
5671 * checksums...
5672 */
5673 if (csump != NULL) {
5674 if (nat->nat_dir == NAT_OUTBOUND)
5675 ipf_fix_incksum(0, csump, nat->nat_sumd[0], 0);
5676 else
5677 ipf_fix_outcksum(0, csump, nat->nat_sumd[0], 0);
5678 }
5679 }
5680
5681 fin->fin_flx |= FI_NATED;
5682 if (np != NULL && np->in_tag.ipt_num[0] != 0)
5683 fin->fin_nattag = &np->in_tag;
5684 return 1;
5685 }
5686
5687
5688 /* ------------------------------------------------------------------------ */
5689 /* Function: ipf_nat_proto */
5690 /* Returns: u_short* - pointer to transport header checksum to update, */
5691 /* NULL if the transport protocol is not recognised */
5692 /* as needing a checksum update. */
5693 /* Parameters: fin(I) - pointer to packet information */
5694 /* nat(I) - pointer to NAT structure */
5695 /* nflags(I) - NAT flags set for this packet */
5696 /* */
5697 /* Return the pointer to the checksum field for each protocol so understood.*/
5698 /* If support for making other changes to a protocol header is required, */
5699 /* that is not strictly 'address' translation, such as clamping the MSS in */
5700 /* TCP down to a specific value, then do it from here. */
5701 /* ------------------------------------------------------------------------ */
5702 u_short *
5703 ipf_nat_proto(fr_info_t *fin, nat_t *nat, u_int nflags)
5704 {
5705 icmphdr_t *icmp;
5706 u_short *csump;
5707 tcphdr_t *tcp;
5708 udphdr_t *udp;
5709
5710 csump = NULL;
5711 if (fin->fin_out == 0) {
5712 fin->fin_rev = (nat->nat_dir & NAT_OUTBOUND);
5713 } else {
5714 fin->fin_rev = ((nat->nat_dir & NAT_OUTBOUND) == 0);
5715 }
5716
5717 switch (fin->fin_p)
5718 {
5719 case IPPROTO_TCP :
5720 tcp = fin->fin_dp;
5721
5722 if ((nflags & IPN_TCP) != 0)
5723 csump = &tcp->th_sum;
5724
5725 /*
5726 * Do a MSS CLAMPING on a SYN packet,
5727 * only deal IPv4 for now.
5728 */
5729 if ((nat->nat_mssclamp != 0) && (tcp->th_flags & TH_SYN) != 0)
5730 ipf_nat_mssclamp(tcp, nat->nat_mssclamp, fin, csump);
5731
5732 break;
5733
5734 case IPPROTO_UDP :
5735 udp = fin->fin_dp;
5736
5737 if ((nflags & IPN_UDP) != 0) {
5738 if (udp->uh_sum != 0)
5739 csump = &udp->uh_sum;
5740 }
5741 break;
5742
5743 case IPPROTO_ICMP :
5744 icmp = fin->fin_dp;
5745
5746 if ((nflags & IPN_ICMPQUERY) != 0) {
5747 if (icmp->icmp_cksum != 0)
5748 csump = &icmp->icmp_cksum;
5749 }
5750 break;
5751
5752 #ifdef USE_INET6
5753 case IPPROTO_ICMPV6 :
5754 {
5755 struct icmp6_hdr *icmp6 = (struct icmp6_hdr *)fin->fin_dp;
5756
5757 icmp6 = fin->fin_dp;
5758
5759 if ((nflags & IPN_ICMPQUERY) != 0) {
5760 if (icmp6->icmp6_cksum != 0)
5761 csump = &icmp6->icmp6_cksum;
5762 }
5763 break;
5764 }
5765 #endif
5766 }
5767 return csump;
5768 }
5769
5770
5771 /* ------------------------------------------------------------------------ */
5772 /* Function: ipf_nat_expire */
5773 /* Returns: Nil */
5774 /* Parameters: softc(I) - pointer to soft context main structure */
5775 /* */
5776 /* Check all of the timeout queues for entries at the top which need to be */
5777 /* expired. */
5778 /* ------------------------------------------------------------------------ */
5779 void
5780 ipf_nat_expire(ipf_main_softc_t *softc)
5781 {
5782 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
5783 ipftq_t *ifq, *ifqnext;
5784 ipftqent_t *tqe, *tqn;
5785 int i;
5786 SPL_INT(s);
5787
5788 SPL_NET(s);
5789 WRITE_ENTER(&softc->ipf_nat);
5790 for (ifq = softn->ipf_nat_tcptq, i = 0; ifq != NULL;
5791 ifq = ifq->ifq_next) {
5792 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) {
5793 if (tqe->tqe_die > softc->ipf_ticks)
5794 break;
5795 tqn = tqe->tqe_next;
5796 ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE);
5797 }
5798 }
5799
5800 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifq->ifq_next) {
5801 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) {
5802 if (tqe->tqe_die > softc->ipf_ticks)
5803 break;
5804 tqn = tqe->tqe_next;
5805 ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE);
5806 }
5807 }
5808
5809 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) {
5810 ifqnext = ifq->ifq_next;
5811
5812 if (((ifq->ifq_flags & IFQF_DELETE) != 0) &&
5813 (ifq->ifq_ref == 0)) {
5814 ipf_freetimeoutqueue(softc, ifq);
5815 }
5816 }
5817
5818 if (softn->ipf_nat_doflush != 0) {
5819 ipf_nat_extraflush(softc, softn, 2);
5820 softn->ipf_nat_doflush = 0;
5821 }
5822
5823 RWLOCK_EXIT(&softc->ipf_nat);
5824 SPL_X(s);
5825 }
5826
5827
5828 /* ------------------------------------------------------------------------ */
5829 /* Function: ipf_nat_sync */
5830 /* Returns: Nil */
5831 /* Parameters: softc(I) - pointer to soft context main structure */
5832 /* ifp(I) - pointer to network interface */
5833 /* */
5834 /* Walk through all of the currently active NAT sessions, looking for those */
5835 /* which need to have their translated address updated. */
5836 /* ------------------------------------------------------------------------ */
5837 void
5838 ipf_nat_sync(ipf_main_softc_t *softc, void *ifp)
5839 {
5840 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
5841 u_32_t sum1, sum2, sumd;
5842 i6addr_t in;
5843 ipnat_t *n;
5844 nat_t *nat;
5845 void *ifp2;
5846 int idx;
5847 SPL_INT(s);
5848
5849 if (softc->ipf_running <= 0)
5850 return;
5851
5852 /*
5853 * Change IP addresses for NAT sessions for any protocol except TCP
5854 * since it will break the TCP connection anyway. The only rules
5855 * which will get changed are those which are "map ... -> 0/32",
5856 * where the rule specifies the address is taken from the interface.
5857 */
5858 SPL_NET(s);
5859 WRITE_ENTER(&softc->ipf_nat);
5860
5861 if (softc->ipf_running <= 0) {
5862 RWLOCK_EXIT(&softc->ipf_nat);
5863 return;
5864 }
5865
5866 for (nat = softn->ipf_nat_instances; nat; nat = nat->nat_next) {
5867 if ((nat->nat_flags & IPN_TCP) != 0)
5868 continue;
5869
5870 n = nat->nat_ptr;
5871 if (n != NULL) {
5872 if (n->in_v[1] == 4) {
5873 if (n->in_redir & NAT_MAP) {
5874 if ((n->in_nsrcaddr != 0) ||
5875 (n->in_nsrcmsk != 0xffffffff))
5876 continue;
5877 } else if (n->in_redir & NAT_REDIRECT) {
5878 if ((n->in_ndstaddr != 0) ||
5879 (n->in_ndstmsk != 0xffffffff))
5880 continue;
5881 }
5882 }
5883 #ifdef USE_INET6
5884 if (n->in_v[1] == 4) {
5885 if (n->in_redir & NAT_MAP) {
5886 if (!IP6_ISZERO(&n->in_nsrcaddr) ||
5887 !IP6_ISONES(&n->in_nsrcmsk))
5888 continue;
5889 } else if (n->in_redir & NAT_REDIRECT) {
5890 if (!IP6_ISZERO(&n->in_ndstaddr) ||
5891 !IP6_ISONES(&n->in_ndstmsk))
5892 continue;
5893 }
5894 }
5895 #endif
5896 }
5897
5898 if (((ifp == NULL) || (ifp == nat->nat_ifps[0]) ||
5899 (ifp == nat->nat_ifps[1]))) {
5900 nat->nat_ifps[0] = GETIFP(nat->nat_ifnames[0],
5901 nat->nat_v[0]);
5902 if ((nat->nat_ifps[0] != NULL) &&
5903 (nat->nat_ifps[0] != (void *)-1)) {
5904 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]);
5905 }
5906 if (nat->nat_ifnames[1][0] != '\0') {
5907 nat->nat_ifps[1] = GETIFP(nat->nat_ifnames[1],
5908 nat->nat_v[1]);
5909 } else {
5910 nat->nat_ifps[1] = nat->nat_ifps[0];
5911 }
5912 if ((nat->nat_ifps[1] != NULL) &&
5913 (nat->nat_ifps[1] != (void *)-1)) {
5914 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]);
5915 }
5916 ifp2 = nat->nat_ifps[0];
5917 if (ifp2 == NULL)
5918 continue;
5919
5920 /*
5921 * Change the map-to address to be the same as the
5922 * new one.
5923 */
5924 sum1 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6);
5925 if (ipf_ifpaddr(softc, nat->nat_v[0], FRI_NORMAL, ifp2,
5926 &in, NULL) != -1) {
5927 if (nat->nat_v[0] == 4)
5928 nat->nat_nsrcip = in.in4;
5929 }
5930 sum2 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6);
5931
5932 if (sum1 == sum2)
5933 continue;
5934 /*
5935 * Readjust the checksum adjustment to take into
5936 * account the new IP#.
5937 */
5938 CALC_SUMD(sum1, sum2, sumd);
5939 /* XXX - dont change for TCP when solaris does
5940 * hardware checksumming.
5941 */
5942 sumd += nat->nat_sumd[0];
5943 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16);
5944 nat->nat_sumd[1] = nat->nat_sumd[0];
5945 }
5946 }
5947
5948 for (n = softn->ipf_nat_list; (n != NULL); n = n->in_next) {
5949 char *base = n->in_names;
5950
5951 if ((ifp == NULL) || (n->in_ifps[0] == ifp))
5952 n->in_ifps[0] = ipf_resolvenic(softc,
5953 base + n->in_ifnames[0],
5954 n->in_v[0]);
5955 if ((ifp == NULL) || (n->in_ifps[1] == ifp))
5956 n->in_ifps[1] = ipf_resolvenic(softc,
5957 base + n->in_ifnames[1],
5958 n->in_v[1]);
5959
5960 if (n->in_redir & NAT_REDIRECT)
5961 idx = 1;
5962 else
5963 idx = 0;
5964
5965 if (((ifp == NULL) || (n->in_ifps[idx] == ifp)) &&
5966 (n->in_ifps[idx] != NULL &&
5967 n->in_ifps[idx] != (void *)-1)) {
5968
5969 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc,
5970 0, n->in_ifps[idx]);
5971 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst,
5972 0, n->in_ifps[idx]);
5973 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc,
5974 0, n->in_ifps[idx]);
5975 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst,
5976 0, n->in_ifps[idx]);
5977 }
5978 }
5979 RWLOCK_EXIT(&softc->ipf_nat);
5980 SPL_X(s);
5981 }
5982
5983
5984 /* ------------------------------------------------------------------------ */
5985 /* Function: ipf_nat_icmpquerytype */
5986 /* Returns: int - 1 == success, 0 == failure */
5987 /* Parameters: icmptype(I) - ICMP type number */
5988 /* */
5989 /* Tests to see if the ICMP type number passed is a query/response type or */
5990 /* not. */
5991 /* ------------------------------------------------------------------------ */
5992 static int
5993 ipf_nat_icmpquerytype(int icmptype)
5994 {
5995
5996 /*
5997 * For the ICMP query NAT code, it is essential that both the query
5998 * and the reply match on the NAT rule. Because the NAT structure
5999 * does not keep track of the icmptype, and a single NAT structure
6000 * is used for all icmp types with the same src, dest and id, we
6001 * simply define the replies as queries as well. The funny thing is,
6002 * although it seems silly to call a reply a query, this is exactly
6003 * as it is defined in the IPv4 specification
6004 */
6005 switch (icmptype)
6006 {
6007 case ICMP_ECHOREPLY:
6008 case ICMP_ECHO:
6009 /* route aedvertisement/solliciation is currently unsupported: */
6010 /* it would require rewriting the ICMP data section */
6011 case ICMP_TSTAMP:
6012 case ICMP_TSTAMPREPLY:
6013 case ICMP_IREQ:
6014 case ICMP_IREQREPLY:
6015 case ICMP_MASKREQ:
6016 case ICMP_MASKREPLY:
6017 return 1;
6018 default:
6019 return 0;
6020 }
6021 }
6022
6023
6024 /* ------------------------------------------------------------------------ */
6025 /* Function: nat_log */
6026 /* Returns: Nil */
6027 /* Parameters: softc(I) - pointer to soft context main structure */
6028 /* softn(I) - pointer to NAT context structure */
6029 /* nat(I) - pointer to NAT structure */
6030 /* action(I) - action related to NAT structure being performed */
6031 /* */
6032 /* Creates a NAT log entry. */
6033 /* ------------------------------------------------------------------------ */
6034 void
6035 ipf_nat_log(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, struct nat *nat,
6036 u_int action)
6037 {
6038 #ifdef IPFILTER_LOG
6039 # ifndef LARGE_NAT
6040 struct ipnat *np;
6041 int rulen;
6042 # endif
6043 struct natlog natl;
6044 void *items[1];
6045 size_t sizes[1];
6046 int types[1];
6047
6048 bcopy((char *)&nat->nat_osrc6, (char *)&natl.nl_osrcip,
6049 sizeof(natl.nl_osrcip));
6050 bcopy((char *)&nat->nat_nsrc6, (char *)&natl.nl_nsrcip,
6051 sizeof(natl.nl_nsrcip));
6052 bcopy((char *)&nat->nat_odst6, (char *)&natl.nl_odstip,
6053 sizeof(natl.nl_odstip));
6054 bcopy((char *)&nat->nat_ndst6, (char *)&natl.nl_ndstip,
6055 sizeof(natl.nl_ndstip));
6056
6057 natl.nl_bytes[0] = nat->nat_bytes[0];
6058 natl.nl_bytes[1] = nat->nat_bytes[1];
6059 natl.nl_pkts[0] = nat->nat_pkts[0];
6060 natl.nl_pkts[1] = nat->nat_pkts[1];
6061 natl.nl_odstport = nat->nat_odport;
6062 natl.nl_osrcport = nat->nat_osport;
6063 natl.nl_nsrcport = nat->nat_nsport;
6064 natl.nl_ndstport = nat->nat_ndport;
6065 natl.nl_p[0] = nat->nat_pr[0];
6066 natl.nl_p[1] = nat->nat_pr[1];
6067 natl.nl_v[0] = nat->nat_v[0];
6068 natl.nl_v[1] = nat->nat_v[1];
6069 natl.nl_type = nat->nat_redir;
6070 natl.nl_action = action;
6071 natl.nl_rule = -1;
6072
6073 bcopy(nat->nat_ifnames[0], natl.nl_ifnames[0],
6074 sizeof(nat->nat_ifnames[0]));
6075 bcopy(nat->nat_ifnames[1], natl.nl_ifnames[1],
6076 sizeof(nat->nat_ifnames[1]));
6077
6078 # ifndef LARGE_NAT
6079 if (nat->nat_ptr != NULL) {
6080 for (rulen = 0, np = softn->ipf_nat_list; np != NULL;
6081 np = np->in_next, rulen++)
6082 if (np == nat->nat_ptr) {
6083 natl.nl_rule = rulen;
6084 break;
6085 }
6086 }
6087 # endif
6088 items[0] = &natl;
6089 sizes[0] = sizeof(natl);
6090 types[0] = 0;
6091
6092 (void) ipf_log_items(softc, IPL_LOGNAT, NULL, items, sizes, types, 1);
6093 #endif
6094 }
6095
6096
6097 #if defined(__OpenBSD__)
6098 /* ------------------------------------------------------------------------ */
6099 /* Function: ipf_nat_ifdetach */
6100 /* Returns: Nil */
6101 /* Parameters: ifp(I) - pointer to network interface */
6102 /* */
6103 /* Compatibility interface for OpenBSD to trigger the correct updating of */
6104 /* interface references within IPFilter. */
6105 /* ------------------------------------------------------------------------ */
6106 void
6107 ipf_nat_ifdetach(ifp)
6108 void *ifp;
6109 {
6110 ipf_main_softc_t *softc;
6111
6112 softc = ipf_get_softc(0);
6113
6114 ipf_sync(ifp);
6115 return;
6116 }
6117 #endif
6118
6119
6120 /* ------------------------------------------------------------------------ */
6121 /* Function: ipf_nat_rule_deref */
6122 /* Returns: Nil */
6123 /* Parameters: softc(I) - pointer to soft context main structure */
6124 /* inp(I) - pointer to pointer to NAT rule */
6125 /* Write Locks: ipf_nat */
6126 /* */
6127 /* Dropping the refernce count for a rule means that whatever held the */
6128 /* pointer to this rule (*inp) is no longer interested in it and when the */
6129 /* reference count drops to zero, any resources allocated for the rule can */
6130 /* be released and the rule itself free'd. */
6131 /* ------------------------------------------------------------------------ */
6132 void
6133 ipf_nat_rule_deref(ipf_main_softc_t *softc, ipnat_t **inp)
6134 {
6135 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
6136 ipnat_t *n;
6137
6138 n = *inp;
6139 *inp = NULL;
6140 n->in_use--;
6141 if (n->in_use > 0)
6142 return;
6143
6144 if (n->in_apr != NULL)
6145 ipf_proxy_deref(n->in_apr);
6146
6147 ipf_nat_rule_fini(softc, n);
6148
6149 if (n->in_redir & NAT_REDIRECT) {
6150 if ((n->in_flags & IPN_PROXYRULE) == 0) {
6151 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_rdr);
6152 }
6153 }
6154 if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) {
6155 if ((n->in_flags & IPN_PROXYRULE) == 0) {
6156 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_map);
6157 }
6158 }
6159
6160 if (n->in_tqehead[0] != NULL) {
6161 if (ipf_deletetimeoutqueue(n->in_tqehead[0]) == 0) {
6162 ipf_freetimeoutqueue(softc, n->in_tqehead[1]);
6163 }
6164 }
6165
6166 if (n->in_tqehead[1] != NULL) {
6167 if (ipf_deletetimeoutqueue(n->in_tqehead[1]) == 0) {
6168 ipf_freetimeoutqueue(softc, n->in_tqehead[1]);
6169 }
6170 }
6171
6172 if ((n->in_flags & IPN_PROXYRULE) == 0) {
6173 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules);
6174 }
6175
6176 MUTEX_DESTROY(&n->in_lock);
6177
6178 KFREES(n, n->in_size);
6179
6180 #if SOLARIS && !defined(INSTANCES)
6181 if (softn->ipf_nat_stats.ns_rules == 0)
6182 pfil_delayed_copy = 1;
6183 #endif
6184 }
6185
6186
6187 /* ------------------------------------------------------------------------ */
6188 /* Function: ipf_nat_deref */
6189 /* Returns: Nil */
6190 /* Parameters: softc(I) - pointer to soft context main structure */
6191 /* natp(I) - pointer to pointer to NAT table entry */
6192 /* */
6193 /* Decrement the reference counter for this NAT table entry and free it if */
6194 /* there are no more things using it. */
6195 /* */
6196 /* IF nat_ref == 1 when this function is called, then we have an orphan nat */
6197 /* structure *because* it only gets called on paths _after_ nat_ref has been*/
6198 /* incremented. If nat_ref == 1 then we shouldn't decrement it here */
6199 /* because nat_delete() will do that and send nat_ref to -1. */
6200 /* */
6201 /* Holding the lock on nat_lock is required to serialise nat_delete() being */
6202 /* called from a NAT flush ioctl with a deref happening because of a packet.*/
6203 /* ------------------------------------------------------------------------ */
6204 void
6205 ipf_nat_deref(ipf_main_softc_t *softc, nat_t **natp)
6206 {
6207 nat_t *nat;
6208
6209 nat = *natp;
6210 *natp = NULL;
6211
6212 MUTEX_ENTER(&nat->nat_lock);
6213 if (nat->nat_ref > 1) {
6214 nat->nat_ref--;
6215 ASSERT(nat->nat_ref >= 0);
6216 MUTEX_EXIT(&nat->nat_lock);
6217 return;
6218 }
6219 MUTEX_EXIT(&nat->nat_lock);
6220
6221 WRITE_ENTER(&softc->ipf_nat);
6222 ipf_nat_delete(softc, nat, NL_EXPIRE);
6223 RWLOCK_EXIT(&softc->ipf_nat);
6224 }
6225
6226
6227 /* ------------------------------------------------------------------------ */
6228 /* Function: ipf_nat_clone */
6229 /* Returns: ipstate_t* - NULL == cloning failed, */
6230 /* else pointer to new state structure */
6231 /* Parameters: fin(I) - pointer to packet information */
6232 /* is(I) - pointer to master state structure */
6233 /* Write Lock: ipf_nat */
6234 /* */
6235 /* Create a "duplcate" state table entry from the master. */
6236 /* ------------------------------------------------------------------------ */
6237 nat_t *
6238 ipf_nat_clone(fr_info_t *fin, nat_t *nat)
6239 {
6240 ipf_main_softc_t *softc = fin->fin_main_soft;
6241 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
6242 frentry_t *fr;
6243 nat_t *clone;
6244 ipnat_t *np;
6245
6246 KMALLOC(clone, nat_t *);
6247 if (clone == NULL) {
6248 NBUMPSIDED(fin->fin_out, ns_clone_nomem);
6249 return NULL;
6250 }
6251 bcopy((char *)nat, (char *)clone, sizeof(*clone));
6252
6253 MUTEX_NUKE(&clone->nat_lock);
6254
6255 clone->nat_rev = fin->fin_rev;
6256 clone->nat_aps = NULL;
6257 /*
6258 * Initialize all these so that ipf_nat_delete() doesn't cause a crash.
6259 */
6260 clone->nat_tqe.tqe_pnext = NULL;
6261 clone->nat_tqe.tqe_next = NULL;
6262 clone->nat_tqe.tqe_ifq = NULL;
6263 clone->nat_tqe.tqe_parent = clone;
6264
6265 clone->nat_flags &= ~SI_CLONE;
6266 clone->nat_flags |= SI_CLONED;
6267
6268 if (clone->nat_hm)
6269 clone->nat_hm->hm_ref++;
6270
6271 if (ipf_nat_insert(softc, softn, clone) == -1) {
6272 KFREE(clone);
6273 NBUMPSIDED(fin->fin_out, ns_insert_fail);
6274 return NULL;
6275 }
6276
6277 np = clone->nat_ptr;
6278 if (np != NULL) {
6279 if (softn->ipf_nat_logging)
6280 ipf_nat_log(softc, softn, clone, NL_CLONE);
6281 np->in_use++;
6282 }
6283 fr = clone->nat_fr;
6284 if (fr != NULL) {
6285 MUTEX_ENTER(&fr->fr_lock);
6286 fr->fr_ref++;
6287 MUTEX_EXIT(&fr->fr_lock);
6288 }
6289
6290
6291 /*
6292 * Because the clone is created outside the normal loop of things and
6293 * TCP has special needs in terms of state, initialise the timeout
6294 * state of the new NAT from here.
6295 */
6296 if (clone->nat_pr[0] == IPPROTO_TCP) {
6297 (void) ipf_tcp_age(&clone->nat_tqe, fin, softn->ipf_nat_tcptq,
6298 clone->nat_flags, 2);
6299 }
6300 clone->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, clone);
6301 if (softn->ipf_nat_logging)
6302 ipf_nat_log(softc, softn, clone, NL_CLONE);
6303 return clone;
6304 }
6305
6306
6307 /* ------------------------------------------------------------------------ */
6308 /* Function: ipf_nat_wildok */
6309 /* Returns: int - 1 == packet's ports match wildcards */
6310 /* 0 == packet's ports don't match wildcards */
6311 /* Parameters: nat(I) - NAT entry */
6312 /* sport(I) - source port */
6313 /* dport(I) - destination port */
6314 /* flags(I) - wildcard flags */
6315 /* dir(I) - packet direction */
6316 /* */
6317 /* Use NAT entry and packet direction to determine which combination of */
6318 /* wildcard flags should be used. */
6319 /* ------------------------------------------------------------------------ */
6320 int
6321 ipf_nat_wildok(nat_t *nat, int sport, int dport, int flags, int dir)
6322 {
6323 /*
6324 * When called by dir is set to
6325 * nat_inlookup NAT_INBOUND (0)
6326 * nat_outlookup NAT_OUTBOUND (1)
6327 *
6328 * We simply combine the packet's direction in dir with the original
6329 * "intended" direction of that NAT entry in nat->nat_dir to decide
6330 * which combination of wildcard flags to allow.
6331 */
6332 switch ((dir << 1) | (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND)))
6333 {
6334 case 3: /* outbound packet / outbound entry */
6335 if (((nat->nat_osport == sport) ||
6336 (flags & SI_W_SPORT)) &&
6337 ((nat->nat_odport == dport) ||
6338 (flags & SI_W_DPORT)))
6339 return 1;
6340 break;
6341 case 2: /* outbound packet / inbound entry */
6342 if (((nat->nat_osport == dport) ||
6343 (flags & SI_W_SPORT)) &&
6344 ((nat->nat_odport == sport) ||
6345 (flags & SI_W_DPORT)))
6346 return 1;
6347 break;
6348 case 1: /* inbound packet / outbound entry */
6349 if (((nat->nat_osport == dport) ||
6350 (flags & SI_W_SPORT)) &&
6351 ((nat->nat_odport == sport) ||
6352 (flags & SI_W_DPORT)))
6353 return 1;
6354 break;
6355 case 0: /* inbound packet / inbound entry */
6356 if (((nat->nat_osport == sport) ||
6357 (flags & SI_W_SPORT)) &&
6358 ((nat->nat_odport == dport) ||
6359 (flags & SI_W_DPORT)))
6360 return 1;
6361 break;
6362 default:
6363 break;
6364 }
6365
6366 return(0);
6367 }
6368
6369
6370 /* ------------------------------------------------------------------------ */
6371 /* Function: nat_mssclamp */
6372 /* Returns: Nil */
6373 /* Parameters: tcp(I) - pointer to TCP header */
6374 /* maxmss(I) - value to clamp the TCP MSS to */
6375 /* fin(I) - pointer to packet information */
6376 /* csump(I) - pointer to TCP checksum */
6377 /* */
6378 /* Check for MSS option and clamp it if necessary. If found and changed, */
6379 /* then the TCP header checksum will be updated to reflect the change in */
6380 /* the MSS. */
6381 /* ------------------------------------------------------------------------ */
6382 static void
6383 ipf_nat_mssclamp(tcphdr_t *tcp, u_32_t maxmss, fr_info_t *fin, u_short *csump)
6384 {
6385 u_char *cp, *ep, opt;
6386 int hlen, advance;
6387 u_32_t mss, sumd;
6388
6389 hlen = TCP_OFF(tcp) << 2;
6390 if (hlen > sizeof(*tcp)) {
6391 cp = (u_char *)tcp + sizeof(*tcp);
6392 ep = (u_char *)tcp + hlen;
6393
6394 while (cp < ep) {
6395 opt = cp[0];
6396 if (opt == TCPOPT_EOL)
6397 break;
6398 else if (opt == TCPOPT_NOP) {
6399 cp++;
6400 continue;
6401 }
6402
6403 if (cp + 1 >= ep)
6404 break;
6405 advance = cp[1];
6406 if ((cp + advance > ep) || (advance <= 0))
6407 break;
6408 switch (opt)
6409 {
6410 case TCPOPT_MAXSEG:
6411 if (advance != 4)
6412 break;
6413 mss = cp[2] * 256 + cp[3];
6414 if (mss > maxmss) {
6415 cp[2] = maxmss / 256;
6416 cp[3] = maxmss & 0xff;
6417 CALC_SUMD(mss, maxmss, sumd);
6418 ipf_fix_outcksum(0, csump, sumd, 0);
6419 }
6420 break;
6421 default:
6422 /* ignore unknown options */
6423 break;
6424 }
6425
6426 cp += advance;
6427 }
6428 }
6429 }
6430
6431
6432 /* ------------------------------------------------------------------------ */
6433 /* Function: ipf_nat_setqueue */
6434 /* Returns: Nil */
6435 /* Parameters: softc(I) - pointer to soft context main structure */
6436 /* softn(I) - pointer to NAT context structure */
6437 /* nat(I)- pointer to NAT structure */
6438 /* Locks: ipf_nat (read or write) */
6439 /* */
6440 /* Put the NAT entry on its default queue entry, using rev as a helped in */
6441 /* determining which queue it should be placed on. */
6442 /* ------------------------------------------------------------------------ */
6443 void
6444 ipf_nat_setqueue(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat)
6445 {
6446 ipftq_t *oifq, *nifq;
6447 int rev = nat->nat_rev;
6448
6449 if (nat->nat_ptr != NULL)
6450 nifq = nat->nat_ptr->in_tqehead[rev];
6451 else
6452 nifq = NULL;
6453
6454 if (nifq == NULL) {
6455 switch (nat->nat_pr[0])
6456 {
6457 case IPPROTO_UDP :
6458 nifq = &softn->ipf_nat_udptq;
6459 break;
6460 case IPPROTO_ICMP :
6461 nifq = &softn->ipf_nat_icmptq;
6462 break;
6463 case IPPROTO_TCP :
6464 nifq = softn->ipf_nat_tcptq +
6465 nat->nat_tqe.tqe_state[rev];
6466 break;
6467 default :
6468 nifq = &softn->ipf_nat_iptq;
6469 break;
6470 }
6471 }
6472
6473 oifq = nat->nat_tqe.tqe_ifq;
6474 /*
6475 * If it's currently on a timeout queue, move it from one queue to
6476 * another, else put it on the end of the newly determined queue.
6477 */
6478 if (oifq != NULL)
6479 ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq, nifq);
6480 else
6481 ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe, nifq, nat);
6482 return;
6483 }
6484
6485
6486 /* ------------------------------------------------------------------------ */
6487 /* Function: nat_getnext */
6488 /* Returns: int - 0 == ok, else error */
6489 /* Parameters: softc(I) - pointer to soft context main structure */
6490 /* t(I) - pointer to ipftoken structure */
6491 /* itp(I) - pointer to ipfgeniter_t structure */
6492 /* */
6493 /* Fetch the next nat/ipnat structure pointer from the linked list and */
6494 /* copy it out to the storage space pointed to by itp_data. The next item */
6495 /* in the list to look at is put back in the ipftoken struture. */
6496 /* ------------------------------------------------------------------------ */
6497 static int
6498 ipf_nat_getnext(ipf_main_softc_t *softc, ipftoken_t *t, ipfgeniter_t *itp,
6499 ipfobj_t *objp)
6500 {
6501 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
6502 hostmap_t *hm, *nexthm = NULL, zerohm;
6503 ipnat_t *ipn, *nextipnat = NULL, zeroipn;
6504 nat_t *nat, *nextnat = NULL, zeronat;
6505 int error = 0;
6506 void *nnext;
6507
6508 if (itp->igi_nitems != 1) {
6509 IPFERROR(60075);
6510 return ENOSPC;
6511 }
6512
6513 READ_ENTER(&softc->ipf_nat);
6514
6515 switch (itp->igi_type)
6516 {
6517 case IPFGENITER_HOSTMAP :
6518 hm = t->ipt_data;
6519 if (hm == NULL) {
6520 nexthm = softn->ipf_hm_maplist;
6521 } else {
6522 nexthm = hm->hm_next;
6523 }
6524 if (nexthm != NULL) {
6525 ATOMIC_INC32(nexthm->hm_ref);
6526 t->ipt_data = nexthm;
6527 } else {
6528 bzero(&zerohm, sizeof(zerohm));
6529 nexthm = &zerohm;
6530 t->ipt_data = NULL;
6531 }
6532 nnext = nexthm->hm_next;
6533 break;
6534
6535 case IPFGENITER_IPNAT :
6536 ipn = t->ipt_data;
6537 if (ipn == NULL) {
6538 nextipnat = softn->ipf_nat_list;
6539 } else {
6540 nextipnat = ipn->in_next;
6541 }
6542 if (nextipnat != NULL) {
6543 ATOMIC_INC32(nextipnat->in_use);
6544 t->ipt_data = nextipnat;
6545 } else {
6546 bzero(&zeroipn, sizeof(zeroipn));
6547 nextipnat = &zeroipn;
6548 t->ipt_data = NULL;
6549 }
6550 nnext = nextipnat->in_next;
6551 break;
6552
6553 case IPFGENITER_NAT :
6554 nat = t->ipt_data;
6555 if (nat == NULL) {
6556 nextnat = softn->ipf_nat_instances;
6557 } else {
6558 nextnat = nat->nat_next;
6559 }
6560 if (nextnat != NULL) {
6561 MUTEX_ENTER(&nextnat->nat_lock);
6562 nextnat->nat_ref++;
6563 MUTEX_EXIT(&nextnat->nat_lock);
6564 t->ipt_data = nextnat;
6565 } else {
6566 bzero(&zeronat, sizeof(zeronat));
6567 nextnat = &zeronat;
6568 t->ipt_data = NULL;
6569 }
6570 nnext = nextnat->nat_next;
6571 break;
6572
6573 default :
6574 RWLOCK_EXIT(&softc->ipf_nat);
6575 IPFERROR(60055);
6576 return EINVAL;
6577 }
6578
6579 RWLOCK_EXIT(&softc->ipf_nat);
6580
6581 objp->ipfo_ptr = itp->igi_data;
6582
6583 switch (itp->igi_type)
6584 {
6585 case IPFGENITER_HOSTMAP :
6586 error = COPYOUT(nexthm, objp->ipfo_ptr, sizeof(*nexthm));
6587 if (error != 0) {
6588 IPFERROR(60049);
6589 error = EFAULT;
6590 }
6591 if (hm != NULL) {
6592 WRITE_ENTER(&softc->ipf_nat);
6593 ipf_nat_hostmapdel(softc, &hm);
6594 RWLOCK_EXIT(&softc->ipf_nat);
6595 }
6596 break;
6597
6598 case IPFGENITER_IPNAT :
6599 objp->ipfo_size = nextipnat->in_size;
6600 objp->ipfo_type = IPFOBJ_IPNAT;
6601 error = ipf_outobjk(softc, objp, nextipnat);
6602 if (ipn != NULL) {
6603 WRITE_ENTER(&softc->ipf_nat);
6604 ipf_nat_rule_deref(softc, &ipn);
6605 RWLOCK_EXIT(&softc->ipf_nat);
6606 }
6607 break;
6608
6609 case IPFGENITER_NAT :
6610 objp->ipfo_size = sizeof(nat_t);
6611 objp->ipfo_type = IPFOBJ_NAT;
6612 error = ipf_outobjk(softc, objp, nextnat);
6613 if (nat != NULL)
6614 ipf_nat_deref(softc, &nat);
6615
6616 break;
6617 }
6618
6619 if (nnext == NULL)
6620 ipf_token_mark_complete(t);
6621
6622 return error;
6623 }
6624
6625
6626 /* ------------------------------------------------------------------------ */
6627 /* Function: nat_extraflush */
6628 /* Returns: int - 0 == success, -1 == failure */
6629 /* Parameters: softc(I) - pointer to soft context main structure */
6630 /* softn(I) - pointer to NAT context structure */
6631 /* which(I) - how to flush the active NAT table */
6632 /* Write Locks: ipf_nat */
6633 /* */
6634 /* Flush nat tables. Three actions currently defined: */
6635 /* which == 0 : flush all nat table entries */
6636 /* which == 1 : flush TCP connections which have started to close but are */
6637 /* stuck for some reason. */
6638 /* which == 2 : flush TCP connections which have been idle for a long time, */
6639 /* starting at > 4 days idle and working back in successive half-*/
6640 /* days to at most 12 hours old. If this fails to free enough */
6641 /* slots then work backwards in half hour slots to 30 minutes. */
6642 /* If that too fails, then work backwards in 30 second intervals */
6643 /* for the last 30 minutes to at worst 30 seconds idle. */
6644 /* ------------------------------------------------------------------------ */
6645 static int
6646 ipf_nat_extraflush(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, int which)
6647 {
6648 nat_t *nat, **natp;
6649 ipftqent_t *tqn;
6650 ipftq_t *ifq;
6651 int removed;
6652 SPL_INT(s);
6653
6654 removed = 0;
6655
6656 SPL_NET(s);
6657 switch (which)
6658 {
6659 case 0 :
6660 softn->ipf_nat_stats.ns_flush_all++;
6661 /*
6662 * Style 0 flush removes everything...
6663 */
6664 for (natp = &softn->ipf_nat_instances;
6665 ((nat = *natp) != NULL); ) {
6666 ipf_nat_delete(softc, nat, NL_FLUSH);
6667 removed++;
6668 }
6669 break;
6670
6671 case 1 :
6672 softn->ipf_nat_stats.ns_flush_closing++;
6673 /*
6674 * Since we're only interested in things that are closing,
6675 * we can start with the appropriate timeout queue.
6676 */
6677 for (ifq = softn->ipf_nat_tcptq + IPF_TCPS_CLOSE_WAIT;
6678 ifq != NULL; ifq = ifq->ifq_next) {
6679
6680 for (tqn = ifq->ifq_head; tqn != NULL; ) {
6681 nat = tqn->tqe_parent;
6682 tqn = tqn->tqe_next;
6683 if (nat->nat_pr[0] != IPPROTO_TCP ||
6684 nat->nat_pr[1] != IPPROTO_TCP)
6685 break;
6686 ipf_nat_delete(softc, nat, NL_EXPIRE);
6687 removed++;
6688 }
6689 }
6690
6691 /*
6692 * Also need to look through the user defined queues.
6693 */
6694 for (ifq = softn->ipf_nat_utqe; ifq != NULL;
6695 ifq = ifq->ifq_next) {
6696 for (tqn = ifq->ifq_head; tqn != NULL; ) {
6697 nat = tqn->tqe_parent;
6698 tqn = tqn->tqe_next;
6699 if (nat->nat_pr[0] != IPPROTO_TCP ||
6700 nat->nat_pr[1] != IPPROTO_TCP)
6701 continue;
6702
6703 if ((nat->nat_tcpstate[0] >
6704 IPF_TCPS_ESTABLISHED) &&
6705 (nat->nat_tcpstate[1] >
6706 IPF_TCPS_ESTABLISHED)) {
6707 ipf_nat_delete(softc, nat, NL_EXPIRE);
6708 removed++;
6709 }
6710 }
6711 }
6712 break;
6713
6714 /*
6715 * Args 5-11 correspond to flushing those particular states
6716 * for TCP connections.
6717 */
6718 case IPF_TCPS_CLOSE_WAIT :
6719 case IPF_TCPS_FIN_WAIT_1 :
6720 case IPF_TCPS_CLOSING :
6721 case IPF_TCPS_LAST_ACK :
6722 case IPF_TCPS_FIN_WAIT_2 :
6723 case IPF_TCPS_TIME_WAIT :
6724 case IPF_TCPS_CLOSED :
6725 softn->ipf_nat_stats.ns_flush_state++;
6726 tqn = softn->ipf_nat_tcptq[which].ifq_head;
6727 while (tqn != NULL) {
6728 nat = tqn->tqe_parent;
6729 tqn = tqn->tqe_next;
6730 ipf_nat_delete(softc, nat, NL_FLUSH);
6731 removed++;
6732 }
6733 break;
6734
6735 default :
6736 if (which < 30)
6737 break;
6738
6739 softn->ipf_nat_stats.ns_flush_timeout++;
6740 /*
6741 * Take a large arbitrary number to mean the number of seconds
6742 * for which which consider to be the maximum value we'll allow
6743 * the expiration to be.
6744 */
6745 which = IPF_TTLVAL(which);
6746 for (natp = &softn->ipf_nat_instances;
6747 ((nat = *natp) != NULL); ) {
6748 if (softc->ipf_ticks - nat->nat_touched > which) {
6749 ipf_nat_delete(softc, nat, NL_FLUSH);
6750 removed++;
6751 } else
6752 natp = &nat->nat_next;
6753 }
6754 break;
6755 }
6756
6757 if (which != 2) {
6758 SPL_X(s);
6759 return removed;
6760 }
6761
6762 softn->ipf_nat_stats.ns_flush_queue++;
6763
6764 /*
6765 * Asked to remove inactive entries because the table is full, try
6766 * again, 3 times, if first attempt failed with a different criteria
6767 * each time. The order tried in must be in decreasing age.
6768 * Another alternative is to implement random drop and drop N entries
6769 * at random until N have been freed up.
6770 */
6771 if (softc->ipf_ticks - softn->ipf_nat_last_force_flush >
6772 IPF_TTLVAL(5)) {
6773 softn->ipf_nat_last_force_flush = softc->ipf_ticks;
6774
6775 removed = ipf_queueflush(softc, ipf_nat_flush_entry,
6776 softn->ipf_nat_tcptq,
6777 softn->ipf_nat_utqe,
6778 &softn->ipf_nat_stats.ns_active,
6779 softn->ipf_nat_table_sz,
6780 softn->ipf_nat_table_wm_low);
6781 }
6782
6783 SPL_X(s);
6784 return removed;
6785 }
6786
6787
6788 /* ------------------------------------------------------------------------ */
6789 /* Function: ipf_nat_flush_entry */
6790 /* Returns: 0 - always succeeds */
6791 /* Parameters: softc(I) - pointer to soft context main structure */
6792 /* entry(I) - pointer to NAT entry */
6793 /* Write Locks: ipf_nat */
6794 /* */
6795 /* This function is a stepping stone between ipf_queueflush() and */
6796 /* nat_dlete(). It is used so we can provide a uniform interface via the */
6797 /* ipf_queueflush() function. Since the nat_delete() function returns void */
6798 /* we translate that to mean it always succeeds in deleting something. */
6799 /* ------------------------------------------------------------------------ */
6800 static int
6801 ipf_nat_flush_entry(ipf_main_softc_t *softc, void *entry)
6802 {
6803 ipf_nat_delete(softc, entry, NL_FLUSH);
6804 return 0;
6805 }
6806
6807
6808 /* ------------------------------------------------------------------------ */
6809 /* Function: ipf_nat_iterator */
6810 /* Returns: int - 0 == ok, else error */
6811 /* Parameters: softc(I) - pointer to soft context main structure */
6812 /* token(I) - pointer to ipftoken structure */
6813 /* itp(I) - pointer to ipfgeniter_t structure */
6814 /* obj(I) - pointer to data description structure */
6815 /* */
6816 /* This function acts as a handler for the SIOCGENITER ioctls that use a */
6817 /* generic structure to iterate through a list. There are three different */
6818 /* linked lists of NAT related information to go through: NAT rules, active */
6819 /* NAT mappings and the NAT fragment cache. */
6820 /* ------------------------------------------------------------------------ */
6821 static int
6822 ipf_nat_iterator(ipf_main_softc_t *softc, ipftoken_t *token, ipfgeniter_t *itp,
6823 ipfobj_t *obj)
6824 {
6825 int error;
6826
6827 if (itp->igi_data == NULL) {
6828 IPFERROR(60052);
6829 return EFAULT;
6830 }
6831
6832 switch (itp->igi_type)
6833 {
6834 case IPFGENITER_HOSTMAP :
6835 case IPFGENITER_IPNAT :
6836 case IPFGENITER_NAT :
6837 error = ipf_nat_getnext(softc, token, itp, obj);
6838 break;
6839
6840 case IPFGENITER_NATFRAG :
6841 error = ipf_frag_nat_next(softc, token, itp);
6842 break;
6843 default :
6844 IPFERROR(60053);
6845 error = EINVAL;
6846 break;
6847 }
6848
6849 return error;
6850 }
6851
6852
6853 /* ------------------------------------------------------------------------ */
6854 /* Function: ipf_nat_setpending */
6855 /* Returns: Nil */
6856 /* Parameters: softc(I) - pointer to soft context main structure */
6857 /* nat(I) - pointer to NAT structure */
6858 /* Locks: ipf_nat (read or write) */
6859 /* */
6860 /* Put the NAT entry on to the pending queue - this queue has a very short */
6861 /* lifetime where items are put that can't be deleted straight away because */
6862 /* of locking issues but we want to delete them ASAP, anyway. In calling */
6863 /* this function, it is assumed that the owner (if there is one, as shown */
6864 /* by nat_me) is no longer interested in it. */
6865 /* ------------------------------------------------------------------------ */
6866 void
6867 ipf_nat_setpending(ipf_main_softc_t *softc, nat_t *nat)
6868 {
6869 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
6870 ipftq_t *oifq;
6871
6872 oifq = nat->nat_tqe.tqe_ifq;
6873 if (oifq != NULL)
6874 ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq,
6875 &softn->ipf_nat_pending);
6876 else
6877 ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe,
6878 &softn->ipf_nat_pending, nat);
6879
6880 if (nat->nat_me != NULL) {
6881 *nat->nat_me = NULL;
6882 nat->nat_me = NULL;
6883 nat->nat_ref--;
6884 ASSERT(nat->nat_ref >= 0);
6885 }
6886 }
6887
6888
6889 /* ------------------------------------------------------------------------ */
6890 /* Function: nat_newrewrite */
6891 /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */
6892 /* allow rule to be moved if IPN_ROUNDR is set. */
6893 /* Parameters: fin(I) - pointer to packet information */
6894 /* nat(I) - pointer to NAT entry */
6895 /* ni(I) - pointer to structure with misc. information needed */
6896 /* to create new NAT entry. */
6897 /* Write Lock: ipf_nat */
6898 /* */
6899 /* This function is responsible for setting up an active NAT session where */
6900 /* we are changing both the source and destination parameters at the same */
6901 /* time. The loop in here works differently to elsewhere - each iteration */
6902 /* is responsible for changing a single parameter that can be incremented. */
6903 /* So one pass may increase the source IP#, next source port, next dest. IP#*/
6904 /* and the last destination port for a total of 4 iterations to try each. */
6905 /* This is done to try and exhaustively use the translation space available.*/
6906 /* ------------------------------------------------------------------------ */
6907 static int
6908 ipf_nat_newrewrite(fr_info_t *fin, nat_t *nat, natinfo_t *nai)
6909 {
6910 int src_search = 1;
6911 int dst_search = 1;
6912 fr_info_t frnat;
6913 u_32_t flags;
6914 u_short swap;
6915 ipnat_t *np;
6916 nat_t *natl;
6917 int l = 0;
6918 int changed;
6919
6920 natl = NULL;
6921 changed = -1;
6922 np = nai->nai_np;
6923 flags = nat->nat_flags;
6924 bcopy((char *)fin, (char *)&frnat, sizeof(*fin));
6925
6926 nat->nat_hm = NULL;
6927
6928 do {
6929 changed = -1;
6930 /* TRACE (l, src_search, dst_search, np) */
6931
6932 if ((src_search == 0) && (np->in_spnext == 0) &&
6933 (dst_search == 0) && (np->in_dpnext == 0)) {
6934 if (l > 0)
6935 return -1;
6936 }
6937
6938 /*
6939 * Find a new source address
6940 */
6941 if (ipf_nat_nextaddr(fin, &np->in_nsrc, &frnat.fin_saddr,
6942 &frnat.fin_saddr) == -1) {
6943 return -1;
6944 }
6945
6946 if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0xffffffff)) {
6947 src_search = 0;
6948 if (np->in_stepnext == 0)
6949 np->in_stepnext = 1;
6950
6951 } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) {
6952 src_search = 0;
6953 if (np->in_stepnext == 0)
6954 np->in_stepnext = 1;
6955
6956 } else if (np->in_nsrcmsk == 0xffffffff) {
6957 src_search = 0;
6958 if (np->in_stepnext == 0)
6959 np->in_stepnext = 1;
6960
6961 } else if (np->in_nsrcmsk != 0xffffffff) {
6962 if (np->in_stepnext == 0 && changed == -1) {
6963 np->in_snip++;
6964 np->in_stepnext++;
6965 changed = 0;
6966 }
6967 }
6968
6969 if ((flags & IPN_TCPUDPICMP) != 0) {
6970 if (np->in_spnext != 0)
6971 frnat.fin_data[0] = np->in_spnext;
6972
6973 /*
6974 * Standard port translation. Select next port.
6975 */
6976 if ((flags & IPN_FIXEDSPORT) != 0) {
6977 np->in_stepnext = 2;
6978 } else if ((np->in_stepnext == 1) &&
6979 (changed == -1) && (natl != NULL)) {
6980 np->in_spnext++;
6981 np->in_stepnext++;
6982 changed = 1;
6983 if (np->in_spnext > np->in_spmax)
6984 np->in_spnext = np->in_spmin;
6985 }
6986 } else {
6987 np->in_stepnext = 2;
6988 }
6989 np->in_stepnext &= 0x3;
6990
6991 /*
6992 * Find a new destination address
6993 */
6994 /* TRACE (fin, np, l, frnat) */
6995
6996 if (ipf_nat_nextaddr(fin, &np->in_ndst, &frnat.fin_daddr,
6997 &frnat.fin_daddr) == -1)
6998 return -1;
6999 if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) {
7000 dst_search = 0;
7001 if (np->in_stepnext == 2)
7002 np->in_stepnext = 3;
7003
7004 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0)) {
7005 dst_search = 0;
7006 if (np->in_stepnext == 2)
7007 np->in_stepnext = 3;
7008
7009 } else if (np->in_ndstmsk == 0xffffffff) {
7010 dst_search = 0;
7011 if (np->in_stepnext == 2)
7012 np->in_stepnext = 3;
7013
7014 } else if (np->in_ndstmsk != 0xffffffff) {
7015 if ((np->in_stepnext == 2) && (changed == -1) &&
7016 (natl != NULL)) {
7017 changed = 2;
7018 np->in_stepnext++;
7019 np->in_dnip++;
7020 }
7021 }
7022
7023 if ((flags & IPN_TCPUDPICMP) != 0) {
7024 if (np->in_dpnext != 0)
7025 frnat.fin_data[1] = np->in_dpnext;
7026
7027 /*
7028 * Standard port translation. Select next port.
7029 */
7030 if ((flags & IPN_FIXEDDPORT) != 0) {
7031 np->in_stepnext = 0;
7032 } else if (np->in_stepnext == 3 && changed == -1) {
7033 np->in_dpnext++;
7034 np->in_stepnext++;
7035 changed = 3;
7036 if (np->in_dpnext > np->in_dpmax)
7037 np->in_dpnext = np->in_dpmin;
7038 }
7039 } else {
7040 if (np->in_stepnext == 3)
7041 np->in_stepnext = 0;
7042 }
7043
7044 /* TRACE (frnat) */
7045
7046 /*
7047 * Here we do a lookup of the connection as seen from
7048 * the outside. If an IP# pair already exists, try
7049 * again. So if you have A->B becomes C->B, you can
7050 * also have D->E become C->E but not D->B causing
7051 * another C->B. Also take protocol and ports into
7052 * account when determining whether a pre-existing
7053 * NAT setup will cause an external conflict where
7054 * this is appropriate.
7055 *
7056 * fin_data[] is swapped around because we are doing a
7057 * lookup of the packet is if it were moving in the opposite
7058 * direction of the one we are working with now.
7059 */
7060 if (flags & IPN_TCPUDP) {
7061 swap = frnat.fin_data[0];
7062 frnat.fin_data[0] = frnat.fin_data[1];
7063 frnat.fin_data[1] = swap;
7064 }
7065 if (fin->fin_out == 1) {
7066 natl = ipf_nat_inlookup(&frnat,
7067 flags & ~(SI_WILDP|NAT_SEARCH),
7068 (u_int)frnat.fin_p,
7069 frnat.fin_dst, frnat.fin_src);
7070
7071 } else {
7072 natl = ipf_nat_outlookup(&frnat,
7073 flags & ~(SI_WILDP|NAT_SEARCH),
7074 (u_int)frnat.fin_p,
7075 frnat.fin_dst, frnat.fin_src);
7076 }
7077 if (flags & IPN_TCPUDP) {
7078 swap = frnat.fin_data[0];
7079 frnat.fin_data[0] = frnat.fin_data[1];
7080 frnat.fin_data[1] = swap;
7081 }
7082
7083 /* TRACE natl, in_stepnext, l */
7084
7085 if ((natl != NULL) && (l > 8)) /* XXX 8 is arbitrary */
7086 return -1;
7087
7088 np->in_stepnext &= 0x3;
7089
7090 l++;
7091 changed = -1;
7092 } while (natl != NULL);
7093
7094 nat->nat_osrcip = fin->fin_src;
7095 nat->nat_odstip = fin->fin_dst;
7096 nat->nat_nsrcip = frnat.fin_src;
7097 nat->nat_ndstip = frnat.fin_dst;
7098
7099 if ((flags & IPN_TCPUDP) != 0) {
7100 nat->nat_osport = htons(fin->fin_data[0]);
7101 nat->nat_odport = htons(fin->fin_data[1]);
7102 nat->nat_nsport = htons(frnat.fin_data[0]);
7103 nat->nat_ndport = htons(frnat.fin_data[1]);
7104 } else if ((flags & IPN_ICMPQUERY) != 0) {
7105 nat->nat_oicmpid = fin->fin_data[1];
7106 nat->nat_nicmpid = frnat.fin_data[1];
7107 }
7108
7109 return 0;
7110 }
7111
7112
7113 /* ------------------------------------------------------------------------ */
7114 /* Function: nat_newdivert */
7115 /* Returns: int - -1 == error, 0 == success */
7116 /* Parameters: fin(I) - pointer to packet information */
7117 /* nat(I) - pointer to NAT entry */
7118 /* ni(I) - pointer to structure with misc. information needed */
7119 /* to create new NAT entry. */
7120 /* Write Lock: ipf_nat */
7121 /* */
7122 /* Create a new NAT divert session as defined by the NAT rule. This is */
7123 /* somewhat different to other NAT session creation routines because we */
7124 /* do not iterate through either port numbers or IP addresses, searching */
7125 /* for a unique mapping, however, a complimentary duplicate check is made. */
7126 /* ------------------------------------------------------------------------ */
7127 static int
7128 ipf_nat_newdivert(fr_info_t *fin, nat_t *nat, natinfo_t *nai)
7129 {
7130 ipf_main_softc_t *softc = fin->fin_main_soft;
7131 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
7132 fr_info_t frnat;
7133 ipnat_t *np;
7134 nat_t *natl;
7135 int p;
7136
7137 np = nai->nai_np;
7138 bcopy((char *)fin, (char *)&frnat, sizeof(*fin));
7139
7140 nat->nat_pr[0] = 0;
7141 nat->nat_osrcaddr = fin->fin_saddr;
7142 nat->nat_odstaddr = fin->fin_daddr;
7143 frnat.fin_saddr = htonl(np->in_snip);
7144 frnat.fin_daddr = htonl(np->in_dnip);
7145 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
7146 nat->nat_osport = htons(fin->fin_data[0]);
7147 nat->nat_odport = htons(fin->fin_data[1]);
7148 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) {
7149 nat->nat_oicmpid = fin->fin_data[1];
7150 }
7151
7152 if (np->in_redir & NAT_DIVERTUDP) {
7153 frnat.fin_data[0] = np->in_spnext;
7154 frnat.fin_data[1] = np->in_dpnext;
7155 frnat.fin_flx |= FI_TCPUDP;
7156 p = IPPROTO_UDP;
7157 } else {
7158 frnat.fin_flx &= ~FI_TCPUDP;
7159 p = IPPROTO_IPIP;
7160 }
7161
7162 if (fin->fin_out == 1) {
7163 natl = ipf_nat_inlookup(&frnat, 0, p,
7164 frnat.fin_dst, frnat.fin_src);
7165
7166 } else {
7167 natl = ipf_nat_outlookup(&frnat, 0, p,
7168 frnat.fin_dst, frnat.fin_src);
7169 }
7170
7171 if (natl != NULL) {
7172 NBUMPSIDED(fin->fin_out, ns_divert_exist);
7173 return -1;
7174 }
7175
7176 nat->nat_nsrcaddr = frnat.fin_saddr;
7177 nat->nat_ndstaddr = frnat.fin_daddr;
7178 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
7179 nat->nat_nsport = htons(frnat.fin_data[0]);
7180 nat->nat_ndport = htons(frnat.fin_data[1]);
7181 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) {
7182 nat->nat_nicmpid = frnat.fin_data[1];
7183 }
7184
7185 nat->nat_pr[fin->fin_out] = fin->fin_p;
7186 nat->nat_pr[1 - fin->fin_out] = p;
7187
7188 if (np->in_redir & NAT_REDIRECT)
7189 nat->nat_dir = NAT_DIVERTIN;
7190 else
7191 nat->nat_dir = NAT_DIVERTOUT;
7192
7193 return 0;
7194 }
7195
7196
7197 /* ------------------------------------------------------------------------ */
7198 /* Function: nat_builddivertmp */
7199 /* Returns: int - -1 == error, 0 == success */
7200 /* Parameters: softn(I) - pointer to NAT context structure */
7201 /* np(I) - pointer to a NAT rule */
7202 /* */
7203 /* For divert rules, a skeleton packet representing what will be prepended */
7204 /* to the real packet is created. Even though we don't have the full */
7205 /* packet here, a checksum is calculated that we update later when we */
7206 /* fill in the final details. At present a 0 checksum for UDP is being set */
7207 /* here because it is expected that divert will be used for localhost. */
7208 /* ------------------------------------------------------------------------ */
7209 static int
7210 ipf_nat_builddivertmp(ipf_nat_softc_t *softn, ipnat_t *np)
7211 {
7212 udphdr_t *uh;
7213 size_t len;
7214 ip_t *ip;
7215
7216 if ((np->in_redir & NAT_DIVERTUDP) != 0)
7217 len = sizeof(ip_t) + sizeof(udphdr_t);
7218 else
7219 len = sizeof(ip_t);
7220
7221 ALLOC_MB_T(np->in_divmp, len);
7222 if (np->in_divmp == NULL) {
7223 NBUMPD(ipf_nat_stats, ns_divert_build);
7224 return -1;
7225 }
7226
7227 /*
7228 * First, the header to get the packet diverted to the new destination
7229 */
7230 ip = MTOD(np->in_divmp, ip_t *);
7231 IP_V_A(ip, 4);
7232 IP_HL_A(ip, 5);
7233 ip->ip_tos = 0;
7234 if ((np->in_redir & NAT_DIVERTUDP) != 0)
7235 ip->ip_p = IPPROTO_UDP;
7236 else
7237 ip->ip_p = IPPROTO_IPIP;
7238 ip->ip_ttl = 255;
7239 ip->ip_off = 0;
7240 ip->ip_sum = 0;
7241 ip->ip_len = htons(len);
7242 ip->ip_id = 0;
7243 ip->ip_src.s_addr = htonl(np->in_snip);
7244 ip->ip_dst.s_addr = htonl(np->in_dnip);
7245 ip->ip_sum = ipf_cksum((u_short *)ip, sizeof(*ip));
7246
7247 if (np->in_redir & NAT_DIVERTUDP) {
7248 uh = (udphdr_t *)(ip + 1);
7249 uh->uh_sum = 0;
7250 uh->uh_ulen = 8;
7251 uh->uh_sport = htons(np->in_spnext);
7252 uh->uh_dport = htons(np->in_dpnext);
7253 }
7254
7255 return 0;
7256 }
7257
7258
7259 #define MINDECAP (sizeof(ip_t) + sizeof(udphdr_t) + sizeof(ip_t))
7260
7261 /* ------------------------------------------------------------------------ */
7262 /* Function: nat_decap */
7263 /* Returns: int - -1 == error, 0 == success */
7264 /* Parameters: fin(I) - pointer to packet information */
7265 /* nat(I) - pointer to current NAT session */
7266 /* */
7267 /* This function is responsible for undoing a packet's encapsulation in the */
7268 /* reverse of an encap/divert rule. After removing the outer encapsulation */
7269 /* it is necessary to call ipf_makefrip() again so that the contents of 'fin'*/
7270 /* match the "new" packet as it may still be used by IPFilter elsewhere. */
7271 /* We use "dir" here as the basis for some of the expectations about the */
7272 /* outer header. If we return an error, the goal is to leave the original */
7273 /* packet information undisturbed - this falls short at the end where we'd */
7274 /* need to back a backup copy of "fin" - expensive. */
7275 /* ------------------------------------------------------------------------ */
7276 static int
7277 ipf_nat_decap(fr_info_t *fin, nat_t *nat)
7278 {
7279 ipf_main_softc_t *softc = fin->fin_main_soft;
7280 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
7281 char *hdr;
7282 int hlen;
7283 int skip;
7284 mb_t *m;
7285
7286 if ((fin->fin_flx & FI_ICMPERR) != 0) {
7287 /*
7288 * ICMP packets don't get decapsulated, instead what we need
7289 * to do is change the ICMP reply from including (in the data
7290 * portion for errors) the encapsulated packet that we sent
7291 * out to something that resembles the original packet prior
7292 * to encapsulation. This isn't done here - all we're doing
7293 * here is changing the outer address to ensure that it gets
7294 * targetted back to the correct system.
7295 */
7296
7297 if (nat->nat_dir & NAT_OUTBOUND) {
7298 u_32_t sum1, sum2, sumd;
7299
7300 sum1 = ntohl(fin->fin_daddr);
7301 sum2 = ntohl(nat->nat_osrcaddr);
7302 CALC_SUMD(sum1, sum2, sumd);
7303 fin->fin_ip->ip_dst = nat->nat_osrcip;
7304 fin->fin_daddr = nat->nat_osrcaddr;
7305 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \
7306 defined(__osf__) || defined(linux)
7307 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, sumd, 0);
7308 #endif
7309 }
7310 return 0;
7311 }
7312
7313 m = fin->fin_m;
7314 skip = fin->fin_hlen;
7315
7316 switch (nat->nat_dir)
7317 {
7318 case NAT_DIVERTIN :
7319 case NAT_DIVERTOUT :
7320 if (fin->fin_plen < MINDECAP)
7321 return -1;
7322 skip += sizeof(udphdr_t);
7323 break;
7324
7325 case NAT_ENCAPIN :
7326 case NAT_ENCAPOUT :
7327 if (fin->fin_plen < (skip + sizeof(ip_t)))
7328 return -1;
7329 break;
7330 default :
7331 return -1;
7332 /* NOTREACHED */
7333 }
7334
7335 /*
7336 * The aim here is to keep the original packet details in "fin" for
7337 * as long as possible so that returning with an error is for the
7338 * original packet and there is little undoing work to do.
7339 */
7340 if (M_LEN(m) < skip + sizeof(ip_t)) {
7341 if (ipf_pr_pullup(fin, skip + sizeof(ip_t)) == -1)
7342 return -1;
7343 }
7344
7345 hdr = MTOD(fin->fin_m, char *);
7346 fin->fin_ip = (ip_t *)(hdr + skip);
7347 hlen = IP_HL(fin->fin_ip) << 2;
7348
7349 if (ipf_pr_pullup(fin, skip + hlen) == -1) {
7350 NBUMPSIDED(fin->fin_out, ns_decap_pullup);
7351 return -1;
7352 }
7353
7354 fin->fin_hlen = hlen;
7355 fin->fin_dlen -= skip;
7356 fin->fin_plen -= skip;
7357 fin->fin_ipoff += skip;
7358
7359 if (ipf_makefrip(hlen, (ip_t *)hdr, fin) == -1) {
7360 NBUMPSIDED(fin->fin_out, ns_decap_bad);
7361 return -1;
7362 }
7363
7364 return skip;
7365 }
7366
7367
7368 /* ------------------------------------------------------------------------ */
7369 /* Function: nat_nextaddr */
7370 /* Returns: int - -1 == bad input (no new address), */
7371 /* 0 == success and dst has new address */
7372 /* Parameters: fin(I) - pointer to packet information */
7373 /* na(I) - how to generate new address */
7374 /* old(I) - original address being replaced */
7375 /* dst(O) - where to put the new address */
7376 /* Write Lock: ipf_nat */
7377 /* */
7378 /* This function uses the contents of the "na" structure, in combination */
7379 /* with "old" to produce a new address to store in "dst". Not all of the */
7380 /* possible uses of "na" will result in a new address. */
7381 /* ------------------------------------------------------------------------ */
7382 static int
7383 ipf_nat_nextaddr(fr_info_t *fin, nat_addr_t *na, u_32_t *old, u_32_t *dst)
7384 {
7385 ipf_main_softc_t *softc = fin->fin_main_soft;
7386 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
7387 u_32_t amin, amax, new;
7388 i6addr_t newip;
7389 int error;
7390
7391 new = 0;
7392 amin = na->na_addr[0].in4.s_addr;
7393
7394 switch (na->na_atype)
7395 {
7396 case FRI_RANGE :
7397 amax = na->na_addr[1].in4.s_addr;
7398 break;
7399
7400 case FRI_NETMASKED :
7401 case FRI_DYNAMIC :
7402 case FRI_NORMAL :
7403 /*
7404 * Compute the maximum address by adding the inverse of the
7405 * netmask to the minimum address.
7406 */
7407 amax = ~na->na_addr[1].in4.s_addr;
7408 amax |= amin;
7409 break;
7410
7411 case FRI_LOOKUP :
7412 break;
7413
7414 case FRI_BROADCAST :
7415 case FRI_PEERADDR :
7416 case FRI_NETWORK :
7417 default :
7418 return -1;
7419 }
7420
7421 error = -1;
7422
7423 if (na->na_atype == FRI_LOOKUP) {
7424 if (na->na_type == IPLT_DSTLIST) {
7425 error = ipf_dstlist_select_node(fin, na->na_ptr, dst,
7426 NULL);
7427 } else {
7428 NBUMPSIDE(fin->fin_out, ns_badnextaddr);
7429 }
7430
7431 } else if (na->na_atype == IPLT_NONE) {
7432 /*
7433 * 0/0 as the new address means leave it alone.
7434 */
7435 if (na->na_addr[0].in4.s_addr == 0 &&
7436 na->na_addr[1].in4.s_addr == 0) {
7437 new = *old;
7438
7439 /*
7440 * 0/32 means get the interface's address
7441 */
7442 } else if (na->na_addr[0].in4.s_addr == 0 &&
7443 na->na_addr[1].in4.s_addr == 0xffffffff) {
7444 if (ipf_ifpaddr(softc, 4, na->na_atype,
7445 fin->fin_ifp, &newip, NULL) == -1) {
7446 NBUMPSIDED(fin->fin_out, ns_ifpaddrfail);
7447 return -1;
7448 }
7449 new = newip.in4.s_addr;
7450 } else {
7451 new = htonl(na->na_nextip);
7452 }
7453 *dst = new;
7454 error = 0;
7455
7456 } else {
7457 NBUMPSIDE(fin->fin_out, ns_badnextaddr);
7458 }
7459
7460 return error;
7461 }
7462
7463
7464 /* ------------------------------------------------------------------------ */
7465 /* Function: nat_nextaddrinit */
7466 /* Returns: int - 0 == success, else error number */
7467 /* Parameters: softc(I) - pointer to soft context main structure */
7468 /* na(I) - NAT address information for generating new addr*/
7469 /* initial(I) - flag indicating if it is the first call for */
7470 /* this "na" structure. */
7471 /* ifp(I) - network interface to derive address */
7472 /* information from. */
7473 /* */
7474 /* This function is expected to be called in two scenarious: when a new NAT */
7475 /* rule is loaded into the kernel and when the list of NAT rules is sync'd */
7476 /* up with the valid network interfaces (possibly due to them changing.) */
7477 /* To distinguish between these, the "initial" parameter is used. If it is */
7478 /* 1 then this indicates the rule has just been reloaded and 0 for when we */
7479 /* are updating information. This difference is important because in */
7480 /* instances where we are not updating address information associated with */
7481 /* a network interface, we don't want to disturb what the "next" address to */
7482 /* come out of ipf_nat_nextaddr() will be. */
7483 /* ------------------------------------------------------------------------ */
7484 static int
7485 ipf_nat_nextaddrinit(ipf_main_softc_t *softc, char *base, nat_addr_t *na,
7486 int initial, void *ifp)
7487 {
7488
7489 switch (na->na_atype)
7490 {
7491 case FRI_LOOKUP :
7492 if (na->na_subtype == 0) {
7493 na->na_ptr = ipf_lookup_res_num(softc, IPL_LOGNAT,
7494 na->na_type,
7495 na->na_num,
7496 &na->na_func);
7497 } else if (na->na_subtype == 1) {
7498 na->na_ptr = ipf_lookup_res_name(softc, IPL_LOGNAT,
7499 na->na_type,
7500 base + na->na_num,
7501 &na->na_func);
7502 }
7503 if (na->na_func == NULL) {
7504 IPFERROR(60060);
7505 return ESRCH;
7506 }
7507 if (na->na_ptr == NULL) {
7508 IPFERROR(60056);
7509 return ESRCH;
7510 }
7511 break;
7512
7513 case FRI_DYNAMIC :
7514 case FRI_BROADCAST :
7515 case FRI_NETWORK :
7516 case FRI_NETMASKED :
7517 case FRI_PEERADDR :
7518 if (ifp != NULL)
7519 (void )ipf_ifpaddr(softc, 4, na->na_atype, ifp,
7520 &na->na_addr[0], &na->na_addr[1]);
7521 break;
7522
7523 case FRI_SPLIT :
7524 case FRI_RANGE :
7525 if (initial)
7526 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr);
7527 break;
7528
7529 case FRI_NONE :
7530 na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr;
7531 return 0;
7532
7533 case FRI_NORMAL :
7534 na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr;
7535 break;
7536
7537 default :
7538 IPFERROR(60054);
7539 return EINVAL;
7540 }
7541
7542 if (initial && (na->na_atype == FRI_NORMAL)) {
7543 if (na->na_addr[0].in4.s_addr == 0) {
7544 if ((na->na_addr[1].in4.s_addr == 0xffffffff) ||
7545 (na->na_addr[1].in4.s_addr == 0)) {
7546 return 0;
7547 }
7548 }
7549
7550 if (na->na_addr[1].in4.s_addr == 0xffffffff) {
7551 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr);
7552 } else {
7553 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr) + 1;
7554 }
7555 }
7556
7557 return 0;
7558 }
7559
7560
7561 /* ------------------------------------------------------------------------ */
7562 /* Function: ipf_nat_matchflush */
7563 /* Returns: int - -1 == error, 0 == success */
7564 /* Parameters: softc(I) - pointer to soft context main structure */
7565 /* softn(I) - pointer to NAT context structure */
7566 /* nat(I) - pointer to current NAT session */
7567 /* */
7568 /* ------------------------------------------------------------------------ */
7569 static int
7570 ipf_nat_matchflush(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, void *data)
7571 {
7572 int *array, flushed, error;
7573 nat_t *nat, *natnext;
7574 ipfobj_t obj;
7575
7576 error = ipf_matcharray_load(softc, data, &obj, &array);
7577 if (error != 0)
7578 return error;
7579
7580 flushed = 0;
7581
7582 for (nat = softn->ipf_nat_instances; nat != NULL; nat = natnext) {
7583 natnext = nat->nat_next;
7584 if (ipf_nat_matcharray(nat, array, softc->ipf_ticks) == 0) {
7585 ipf_nat_delete(softc, nat, NL_FLUSH);
7586 flushed++;
7587 }
7588 }
7589
7590 obj.ipfo_retval = flushed;
7591 error = BCOPYOUT(&obj, data, sizeof(obj));
7592
7593 KFREES(array, array[0] * sizeof(*array));
7594
7595 return error;
7596 }
7597
7598
7599 /* ------------------------------------------------------------------------ */
7600 /* Function: ipf_nat_matcharray */
7601 /* Returns: int - -1 == error, 0 == success */
7602 /* Parameters: fin(I) - pointer to packet information */
7603 /* nat(I) - pointer to current NAT session */
7604 /* */
7605 /* ------------------------------------------------------------------------ */
7606 static int
7607 ipf_nat_matcharray(nat_t *nat, int *array, u_long ticks)
7608 {
7609 int i, n, *x, e, p;
7610
7611 e = 0;
7612 n = array[0];
7613 x = array + 1;
7614
7615 for (; n > 0; x += 3 + x[2]) {
7616 if (x[0] == IPF_EXP_END)
7617 break;
7618 e = 0;
7619
7620 n -= x[2] + 3;
7621 if (n < 0)
7622 break;
7623
7624 p = x[0] >> 16;
7625 if (p != 0 && p != nat->nat_pr[1])
7626 break;
7627
7628 switch (x[0])
7629 {
7630 case IPF_EXP_IP_PR :
7631 for (i = 0; !e && i < x[2]; i++) {
7632 e |= (nat->nat_pr[1] == x[i + 3]);
7633 }
7634 break;
7635
7636 case IPF_EXP_IP_SRCADDR :
7637 if (nat->nat_v[0] == 4) {
7638 for (i = 0; !e && i < x[2]; i++) {
7639 e |= ((nat->nat_osrcaddr & x[i + 4]) ==
7640 x[i + 3]);
7641 }
7642 }
7643 if (nat->nat_v[1] == 4) {
7644 for (i = 0; !e && i < x[2]; i++) {
7645 e |= ((nat->nat_nsrcaddr & x[i + 4]) ==
7646 x[i + 3]);
7647 }
7648 }
7649 break;
7650
7651 case IPF_EXP_IP_DSTADDR :
7652 if (nat->nat_v[0] == 4) {
7653 for (i = 0; !e && i < x[2]; i++) {
7654 e |= ((nat->nat_odstaddr & x[i + 4]) ==
7655 x[i + 3]);
7656 }
7657 }
7658 if (nat->nat_v[1] == 4) {
7659 for (i = 0; !e && i < x[2]; i++) {
7660 e |= ((nat->nat_ndstaddr & x[i + 4]) ==
7661 x[i + 3]);
7662 }
7663 }
7664 break;
7665
7666 case IPF_EXP_IP_ADDR :
7667 for (i = 0; !e && i < x[2]; i++) {
7668 if (nat->nat_v[0] == 4) {
7669 e |= ((nat->nat_osrcaddr & x[i + 4]) ==
7670 x[i + 3]);
7671 }
7672 if (nat->nat_v[1] == 4) {
7673 e |= ((nat->nat_nsrcaddr & x[i + 4]) ==
7674 x[i + 3]);
7675 }
7676 if (nat->nat_v[0] == 4) {
7677 e |= ((nat->nat_odstaddr & x[i + 4]) ==
7678 x[i + 3]);
7679 }
7680 if (nat->nat_v[1] == 4) {
7681 e |= ((nat->nat_ndstaddr & x[i + 4]) ==
7682 x[i + 3]);
7683 }
7684 }
7685 break;
7686
7687 #ifdef USE_INET6
7688 case IPF_EXP_IP6_SRCADDR :
7689 if (nat->nat_v[0] == 6) {
7690 for (i = 0; !e && i < x[3]; i++) {
7691 e |= IP6_MASKEQ(&nat->nat_osrc6,
7692 x + i + 7, x + i + 3);
7693 }
7694 }
7695 if (nat->nat_v[1] == 6) {
7696 for (i = 0; !e && i < x[3]; i++) {
7697 e |= IP6_MASKEQ(&nat->nat_nsrc6,
7698 x + i + 7, x + i + 3);
7699 }
7700 }
7701 break;
7702
7703 case IPF_EXP_IP6_DSTADDR :
7704 if (nat->nat_v[0] == 6) {
7705 for (i = 0; !e && i < x[3]; i++) {
7706 e |= IP6_MASKEQ(&nat->nat_odst6,
7707 x + i + 7,
7708 x + i + 3);
7709 }
7710 }
7711 if (nat->nat_v[1] == 6) {
7712 for (i = 0; !e && i < x[3]; i++) {
7713 e |= IP6_MASKEQ(&nat->nat_ndst6,
7714 x + i + 7,
7715 x + i + 3);
7716 }
7717 }
7718 break;
7719
7720 case IPF_EXP_IP6_ADDR :
7721 for (i = 0; !e && i < x[3]; i++) {
7722 if (nat->nat_v[0] == 6) {
7723 e |= IP6_MASKEQ(&nat->nat_osrc6,
7724 x + i + 7,
7725 x + i + 3);
7726 }
7727 if (nat->nat_v[0] == 6) {
7728 e |= IP6_MASKEQ(&nat->nat_odst6,
7729 x + i + 7,
7730 x + i + 3);
7731 }
7732 if (nat->nat_v[1] == 6) {
7733 e |= IP6_MASKEQ(&nat->nat_nsrc6,
7734 x + i + 7,
7735 x + i + 3);
7736 }
7737 if (nat->nat_v[1] == 6) {
7738 e |= IP6_MASKEQ(&nat->nat_ndst6,
7739 x + i + 7,
7740 x + i + 3);
7741 }
7742 }
7743 break;
7744 #endif
7745
7746 case IPF_EXP_UDP_PORT :
7747 case IPF_EXP_TCP_PORT :
7748 for (i = 0; !e && i < x[2]; i++) {
7749 e |= (nat->nat_nsport == x[i + 3]) ||
7750 (nat->nat_ndport == x[i + 3]);
7751 }
7752 break;
7753
7754 case IPF_EXP_UDP_SPORT :
7755 case IPF_EXP_TCP_SPORT :
7756 for (i = 0; !e && i < x[2]; i++) {
7757 e |= (nat->nat_nsport == x[i + 3]);
7758 }
7759 break;
7760
7761 case IPF_EXP_UDP_DPORT :
7762 case IPF_EXP_TCP_DPORT :
7763 for (i = 0; !e && i < x[2]; i++) {
7764 e |= (nat->nat_ndport == x[i + 3]);
7765 }
7766 break;
7767
7768 case IPF_EXP_TCP_STATE :
7769 for (i = 0; !e && i < x[2]; i++) {
7770 e |= (nat->nat_tcpstate[0] == x[i + 3]) ||
7771 (nat->nat_tcpstate[1] == x[i + 3]);
7772 }
7773 break;
7774
7775 case IPF_EXP_IDLE_GT :
7776 e |= (ticks - nat->nat_touched > x[3]);
7777 break;
7778 }
7779 e ^= x[1];
7780
7781 if (!e)
7782 break;
7783 }
7784
7785 return e;
7786 }
7787
7788
7789 /* ------------------------------------------------------------------------ */
7790 /* Function: ipf_nat_gettable */
7791 /* Returns: int - 0 = success, else error */
7792 /* Parameters: softc(I) - pointer to soft context main structure */
7793 /* softn(I) - pointer to NAT context structure */
7794 /* data(I) - pointer to ioctl data */
7795 /* */
7796 /* This function handles ioctl requests for tables of nat information. */
7797 /* At present the only table it deals with is the hash bucket statistics. */
7798 /* ------------------------------------------------------------------------ */
7799 static int
7800 ipf_nat_gettable(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, char *data)
7801 {
7802 ipftable_t table;
7803 int error;
7804
7805 error = ipf_inobj(softc, data, NULL, &table, IPFOBJ_GTABLE);
7806 if (error != 0)
7807 return error;
7808
7809 switch (table.ita_type)
7810 {
7811 case IPFTABLE_BUCKETS_NATIN :
7812 error = COPYOUT(softn->ipf_nat_stats.ns_side[0].ns_bucketlen,
7813 table.ita_table,
7814 softn->ipf_nat_table_sz * sizeof(u_int));
7815 break;
7816
7817 case IPFTABLE_BUCKETS_NATOUT :
7818 error = COPYOUT(softn->ipf_nat_stats.ns_side[1].ns_bucketlen,
7819 table.ita_table,
7820 softn->ipf_nat_table_sz * sizeof(u_int));
7821 break;
7822
7823 default :
7824 IPFERROR(60058);
7825 return EINVAL;
7826 }
7827
7828 if (error != 0) {
7829 IPFERROR(60059);
7830 error = EFAULT;
7831 }
7832 return error;
7833 }
7834
7835
7836 /* ------------------------------------------------------------------------ */
7837 /* Function: ipf_nat_settimeout */
7838 /* Returns: int - 0 = success, else failure */
7839 /* Parameters: softc(I) - pointer to soft context main structure */
7840 /* t(I) - pointer to tunable */
7841 /* p(I) - pointer to new tuning data */
7842 /* */
7843 /* Apply the timeout change to the NAT timeout queues. */
7844 /* ------------------------------------------------------------------------ */
7845 int
7846 ipf_nat_settimeout(struct ipf_main_softc_s *softc, ipftuneable_t *t,
7847 ipftuneval_t *p)
7848 {
7849 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
7850
7851 if (!strncmp(t->ipft_name, "tcp_", 4))
7852 return ipf_settimeout_tcp(t, p, softn->ipf_nat_tcptq);
7853
7854 if (!strcmp(t->ipft_name, "udp_timeout")) {
7855 ipf_apply_timeout(&softn->ipf_nat_udptq, p->ipftu_int);
7856 } else if (!strcmp(t->ipft_name, "udp_ack_timeout")) {
7857 ipf_apply_timeout(&softn->ipf_nat_udpacktq, p->ipftu_int);
7858 } else if (!strcmp(t->ipft_name, "icmp_timeout")) {
7859 ipf_apply_timeout(&softn->ipf_nat_icmptq, p->ipftu_int);
7860 } else if (!strcmp(t->ipft_name, "icmp_ack_timeout")) {
7861 ipf_apply_timeout(&softn->ipf_nat_icmpacktq, p->ipftu_int);
7862 } else if (!strcmp(t->ipft_name, "ip_timeout")) {
7863 ipf_apply_timeout(&softn->ipf_nat_iptq, p->ipftu_int);
7864 } else {
7865 IPFERROR(60062);
7866 return ESRCH;
7867 }
7868 return 0;
7869 }
7870
7871
7872 /* ------------------------------------------------------------------------ */
7873 /* Function: ipf_nat_rehash */
7874 /* Returns: int - 0 = success, else failure */
7875 /* Parameters: softc(I) - pointer to soft context main structure */
7876 /* t(I) - pointer to tunable */
7877 /* p(I) - pointer to new tuning data */
7878 /* */
7879 /* To change the size of the basic NAT table, we need to first allocate the */
7880 /* new tables (lest it fails and we've got nowhere to store all of the NAT */
7881 /* sessions currently active) and then walk through the entire list and */
7882 /* insert them into the table. There are two tables here: an inbound one */
7883 /* and an outbound one. Each NAT entry goes into each table once. */
7884 /* ------------------------------------------------------------------------ */
7885 int
7886 ipf_nat_rehash(ipf_main_softc_t *softc, ipftuneable_t *t, ipftuneval_t *p)
7887 {
7888 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
7889 nat_t **newtab[2], *nat, **natp;
7890 u_int *bucketlens[2];
7891 u_int maxbucket;
7892 u_int newsize;
7893 int error;
7894 u_int hv;
7895 int i;
7896
7897 newsize = p->ipftu_int;
7898 /*
7899 * In case there is nothing to do...
7900 */
7901 if (newsize == softn->ipf_nat_table_sz)
7902 return 0;
7903
7904 newtab[0] = NULL;
7905 newtab[1] = NULL;
7906 bucketlens[0] = NULL;
7907 bucketlens[1] = NULL;
7908 /*
7909 * 4 tables depend on the NAT table size: the inbound looking table,
7910 * the outbound lookup table and the hash chain length for each.
7911 */
7912 KMALLOCS(newtab[0], nat_t **, newsize * sizeof(nat_t *));
7913 if (newtab == NULL) {
7914 error = 60063;
7915 goto badrehash;
7916 }
7917
7918 KMALLOCS(newtab[1], nat_t **, newsize * sizeof(nat_t *));
7919 if (newtab == NULL) {
7920 error = 60064;
7921 goto badrehash;
7922 }
7923
7924 KMALLOCS(bucketlens[0], u_int *, newsize * sizeof(u_int));
7925 if (bucketlens[0] == NULL) {
7926 error = 60065;
7927 goto badrehash;
7928 }
7929
7930 KMALLOCS(bucketlens[1], u_int *, newsize * sizeof(u_int));
7931 if (bucketlens[1] == NULL) {
7932 error = 60066;
7933 goto badrehash;
7934 }
7935
7936 /*
7937 * Recalculate the maximum length based on the new size.
7938 */
7939 for (maxbucket = 0, i = newsize; i > 0; i >>= 1)
7940 maxbucket++;
7941 maxbucket *= 2;
7942
7943 bzero((char *)newtab[0], newsize * sizeof(nat_t *));
7944 bzero((char *)newtab[1], newsize * sizeof(nat_t *));
7945 bzero((char *)bucketlens[0], newsize * sizeof(u_int));
7946 bzero((char *)bucketlens[1], newsize * sizeof(u_int));
7947
7948 WRITE_ENTER(&softc->ipf_nat);
7949
7950 if (softn->ipf_nat_table[0] != NULL) {
7951 KFREES(softn->ipf_nat_table[0],
7952 softn->ipf_nat_table_sz *
7953 sizeof(*softn->ipf_nat_table[0]));
7954 }
7955 softn->ipf_nat_table[0] = newtab[0];
7956
7957 if (softn->ipf_nat_table[1] != NULL) {
7958 KFREES(softn->ipf_nat_table[1],
7959 softn->ipf_nat_table_sz *
7960 sizeof(*softn->ipf_nat_table[1]));
7961 }
7962 softn->ipf_nat_table[1] = newtab[1];
7963
7964 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) {
7965 KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen,
7966 softn->ipf_nat_table_sz * sizeof(u_int));
7967 }
7968 softn->ipf_nat_stats.ns_side[0].ns_bucketlen = bucketlens[0];
7969
7970 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) {
7971 KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen,
7972 softn->ipf_nat_table_sz * sizeof(u_int));
7973 }
7974 softn->ipf_nat_stats.ns_side[1].ns_bucketlen = bucketlens[1];
7975
7976 softn->ipf_nat_maxbucket = maxbucket;
7977 softn->ipf_nat_table_sz = newsize;
7978 /*
7979 * Walk through the entire list of NAT table entries and put them
7980 * in the new NAT table, somewhere. Because we have a new table,
7981 * we need to restart the counter of how many chains are in use.
7982 */
7983 softn->ipf_nat_stats.ns_side[0].ns_inuse = 0;
7984 softn->ipf_nat_stats.ns_side[1].ns_inuse = 0;
7985
7986 for (nat = softn->ipf_nat_instances; nat != NULL; nat = nat->nat_next) {
7987 nat->nat_hnext[0] = NULL;
7988 nat->nat_phnext[0] = NULL;
7989 hv = nat->nat_hv[0] % softn->ipf_nat_table_sz;
7990
7991 natp = &softn->ipf_nat_table[0][hv];
7992 if (*natp) {
7993 (*natp)->nat_phnext[0] = &nat->nat_hnext[0];
7994 } else {
7995 NBUMPSIDE(0, ns_inuse);
7996 }
7997 nat->nat_phnext[0] = natp;
7998 nat->nat_hnext[0] = *natp;
7999 *natp = nat;
8000 NBUMPSIDE(0, ns_bucketlen[hv]);
8001
8002 nat->nat_hnext[1] = NULL;
8003 nat->nat_phnext[1] = NULL;
8004 hv = nat->nat_hv[1] % softn->ipf_nat_table_sz;
8005
8006 natp = &softn->ipf_nat_table[1][hv];
8007 if (*natp) {
8008 (*natp)->nat_phnext[1] = &nat->nat_hnext[1];
8009 } else {
8010 NBUMPSIDE(1, ns_inuse);
8011 }
8012 nat->nat_phnext[1] = natp;
8013 nat->nat_hnext[1] = *natp;
8014 *natp = nat;
8015 NBUMPSIDE(1, ns_bucketlen[hv]);
8016 }
8017 RWLOCK_EXIT(&softc->ipf_nat);
8018
8019 return 0;
8020
8021 badrehash:
8022 if (bucketlens[1] != NULL) {
8023 KFREES(bucketlens[0], newsize * sizeof(u_int));
8024 }
8025 if (bucketlens[0] != NULL) {
8026 KFREES(bucketlens[0], newsize * sizeof(u_int));
8027 }
8028 if (newtab[0] != NULL) {
8029 KFREES(newtab[0], newsize * sizeof(nat_t *));
8030 }
8031 if (newtab[1] != NULL) {
8032 KFREES(newtab[1], newsize * sizeof(nat_t *));
8033 }
8034 IPFERROR(error);
8035 return ENOMEM;
8036 }
8037
8038
8039 /* ------------------------------------------------------------------------ */
8040 /* Function: ipf_nat_rehash_rules */
8041 /* Returns: int - 0 = success, else failure */
8042 /* Parameters: softc(I) - pointer to soft context main structure */
8043 /* t(I) - pointer to tunable */
8044 /* p(I) - pointer to new tuning data */
8045 /* */
8046 /* All of the NAT rules hang off of a hash table that is searched with a */
8047 /* hash on address after the netmask is applied. There is a different table*/
8048 /* for both inbound rules (rdr) and outbound (map.) The resizing will only */
8049 /* affect one of these two tables. */
8050 /* ------------------------------------------------------------------------ */
8051 int
8052 ipf_nat_rehash_rules(ipf_main_softc_t *softc, ipftuneable_t *t, ipftuneval_t *p)
8053 {
8054 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
8055 ipnat_t **newtab, *np, ***old, **npp;
8056 u_int newsize;
8057 u_int mask;
8058 u_int hv;
8059
8060 newsize = p->ipftu_int;
8061 /*
8062 * In case there is nothing to do...
8063 */
8064 if (newsize == *t->ipft_pint)
8065 return 0;
8066
8067 /*
8068 * All inbound rules have the NAT_REDIRECT bit set in in_redir and
8069 * all outbound rules have either NAT_MAP or MAT_MAPBLK set.
8070 * This if statement allows for some more generic code to be below,
8071 * rather than two huge gobs of code that almost do the same thing.
8072 */
8073 if (t->ipft_pint == &softn->ipf_nat_rdrrules_sz) {
8074 old = &softn->ipf_nat_rdr_rules;
8075 mask = NAT_REDIRECT;
8076 } else {
8077 old = &softn->ipf_nat_map_rules;
8078 mask = NAT_MAP|NAT_MAPBLK;
8079 }
8080
8081 KMALLOCS(newtab, ipnat_t **, newsize * sizeof(ipnat_t *));
8082 if (newtab == NULL) {
8083 IPFERROR(60067);
8084 return ENOMEM;
8085 }
8086
8087 bzero((char *)newtab, newsize * sizeof(ipnat_t *));
8088
8089 WRITE_ENTER(&softc->ipf_nat);
8090
8091 if (*old != NULL) {
8092 KFREES(*old, *t->ipft_pint * sizeof(ipnat_t **));
8093 }
8094 *old = newtab;
8095 *t->ipft_pint = newsize;
8096
8097 for (np = softn->ipf_nat_list; np != NULL; np = np->in_next) {
8098 if ((np->in_redir & mask) == 0)
8099 continue;
8100
8101 if (np->in_redir & NAT_REDIRECT) {
8102 np->in_rnext = NULL;
8103 hv = np->in_hv[0] % newsize;
8104 for (npp = newtab + hv; *npp != NULL; )
8105 npp = &(*npp)->in_rnext;
8106 np->in_prnext = npp;
8107 *npp = np;
8108 }
8109 if (np->in_redir & NAT_MAP) {
8110 np->in_mnext = NULL;
8111 hv = np->in_hv[1] % newsize;
8112 for (npp = newtab + hv; *npp != NULL; )
8113 npp = &(*npp)->in_mnext;
8114 np->in_pmnext = npp;
8115 *npp = np;
8116 }
8117
8118 }
8119 RWLOCK_EXIT(&softc->ipf_nat);
8120
8121 return 0;
8122 }
8123
8124
8125 /* ------------------------------------------------------------------------ */
8126 /* Function: ipf_nat_hostmap_rehash */
8127 /* Returns: int - 0 = success, else failure */
8128 /* Parameters: softc(I) - pointer to soft context main structure */
8129 /* t(I) - pointer to tunable */
8130 /* p(I) - pointer to new tuning data */
8131 /* */
8132 /* Allocate and populate a new hash table that will contain a reference to */
8133 /* all of the active IP# translations currently in place. */
8134 /* ------------------------------------------------------------------------ */
8135 int
8136 ipf_nat_hostmap_rehash(ipf_main_softc_t *softc, ipftuneable_t *t,
8137 ipftuneval_t *p)
8138 {
8139 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
8140 hostmap_t *hm, **newtab;
8141 u_int newsize;
8142 u_int hv;
8143
8144 newsize = p->ipftu_int;
8145 /*
8146 * In case there is nothing to do...
8147 */
8148 if (newsize == *t->ipft_pint)
8149 return 0;
8150
8151 KMALLOCS(newtab, hostmap_t **, newsize * sizeof(hostmap_t *));
8152 if (newtab == NULL) {
8153 IPFERROR(60068);
8154 return ENOMEM;
8155 }
8156
8157 bzero((char *)newtab, newsize * sizeof(hostmap_t *));
8158
8159 WRITE_ENTER(&softc->ipf_nat);
8160 if (softn->ipf_hm_maptable != NULL) {
8161 KFREES(softn->ipf_hm_maptable,
8162 softn->ipf_nat_hostmap_sz * sizeof(hostmap_t *));
8163 }
8164 softn->ipf_hm_maptable = newtab;
8165 softn->ipf_nat_hostmap_sz = newsize;
8166
8167 for (hm = softn->ipf_hm_maplist; hm != NULL; hm = hm->hm_next) {
8168 hv = hm->hm_hv % softn->ipf_nat_hostmap_sz;
8169 hm->hm_hnext = softn->ipf_hm_maptable[hv];
8170 hm->hm_phnext = softn->ipf_hm_maptable + hv;
8171 if (softn->ipf_hm_maptable[hv] != NULL)
8172 softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext;
8173 softn->ipf_hm_maptable[hv] = hm;
8174 }
8175 RWLOCK_EXIT(&softc->ipf_nat);
8176
8177 return 0;
8178 }
8179
8180
8181 /* ------------------------------------------------------------------------ */
8182 /* Function: ipf_nat_add_tq */
8183 /* Parameters: softc(I) - pointer to soft context main structure */
8184 /* */
8185 /* ------------------------------------------------------------------------ */
8186 ipftq_t *
8187 ipf_nat_add_tq(ipf_main_softc_t *softc, int ttl)
8188 {
8189 ipf_nat_softc_t *softs = softc->ipf_nat_soft;
8190
8191 return ipf_addtimeoutqueue(softc, &softs->ipf_nat_utqe, ttl);
8192 }
8193
8194 /* ------------------------------------------------------------------------ */
8195 /* Function: ipf_nat_uncreate */
8196 /* Returns: Nil */
8197 /* Parameters: fin(I) - pointer to packet information */
8198 /* */
8199 /* This function is used to remove a NAT entry from the NAT table when we */
8200 /* decide that the create was actually in error. It is thus assumed that */
8201 /* fin_flx will have both FI_NATED and FI_NATNEW set. Because we're dealing */
8202 /* with the translated packet (not the original), we have to reverse the */
8203 /* lookup. Although doing the lookup is expensive (relatively speaking), it */
8204 /* is not anticipated that this will be a frequent occurance for normal */
8205 /* traffic patterns. */
8206 /* ------------------------------------------------------------------------ */
8207 void
8208 ipf_nat_uncreate(fr_info_t *fin)
8209 {
8210 ipf_main_softc_t *softc = fin->fin_main_soft;
8211 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
8212 int nflags;
8213 nat_t *nat;
8214
8215 switch (fin->fin_p)
8216 {
8217 case IPPROTO_TCP :
8218 nflags = IPN_TCP;
8219 break;
8220 case IPPROTO_UDP :
8221 nflags = IPN_UDP;
8222 break;
8223 default :
8224 nflags = 0;
8225 break;
8226 }
8227
8228 WRITE_ENTER(&softc->ipf_nat);
8229
8230 if (fin->fin_out == 0) {
8231 nat = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p,
8232 fin->fin_dst, fin->fin_src);
8233 } else {
8234 nat = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p,
8235 fin->fin_src, fin->fin_dst);
8236 }
8237
8238 if (nat != NULL) {
8239 NBUMPSIDE(fin->fin_out, ns_uncreate[0]);
8240 ipf_nat_delete(softc, nat, NL_DESTROY);
8241 } else {
8242 NBUMPSIDE(fin->fin_out, ns_uncreate[1]);
8243 }
8244
8245 RWLOCK_EXIT(&softc->ipf_nat);
8246 }
8247
8248
8249 /* ------------------------------------------------------------------------ */
8250 /* Function: ipf_nat_cmp_rules */
8251 /* Returns: int - 0 == success, else rules do not match. */
8252 /* Parameters: n1(I) - first rule to compare */
8253 /* n2(I) - first rule to compare */
8254 /* */
8255 /* Compare two rules using pointers to each rule. A straight bcmp will not */
8256 /* work as some fields (such as in_dst, in_pkts) actually do change once */
8257 /* the rule has been loaded into the kernel. Whilst this function returns */
8258 /* various non-zero returns, they're strictly to aid in debugging. Use of */
8259 /* this function should simply care if the result is zero or not. */
8260 /* ------------------------------------------------------------------------ */
8261 static int
8262 ipf_nat_cmp_rules(ipnat_t *n1, ipnat_t *n2)
8263 {
8264 if (n1->in_size != n2->in_size)
8265 return 1;
8266
8267 if (bcmp((char *)&n1->in_v, (char *)&n2->in_v,
8268 offsetof(ipnat_t, in_ndst) - offsetof(ipnat_t, in_v)) != 0)
8269 return 2;
8270
8271 if (bcmp((char *)&n1->in_tuc, (char *)&n2->in_tuc,
8272 n1->in_size - offsetof(ipnat_t, in_tuc)) != 0)
8273 return 3;
8274 if (n1->in_ndst.na_atype != n2->in_ndst.na_atype)
8275 return 5;
8276 if (n1->in_ndst.na_function != n2->in_ndst.na_function)
8277 return 6;
8278 if (bcmp((char *)&n1->in_ndst.na_addr, (char *)&n2->in_ndst.na_addr,
8279 sizeof(n1->in_ndst.na_addr)))
8280 return 7;
8281 if (n1->in_nsrc.na_atype != n2->in_nsrc.na_atype)
8282 return 8;
8283 if (n1->in_nsrc.na_function != n2->in_nsrc.na_function)
8284 return 9;
8285 if (bcmp((char *)&n1->in_nsrc.na_addr, (char *)&n2->in_nsrc.na_addr,
8286 sizeof(n1->in_nsrc.na_addr)))
8287 return 10;
8288 if (n1->in_odst.na_atype != n2->in_odst.na_atype)
8289 return 11;
8290 if (n1->in_odst.na_function != n2->in_odst.na_function)
8291 return 12;
8292 if (bcmp((char *)&n1->in_odst.na_addr, (char *)&n2->in_odst.na_addr,
8293 sizeof(n1->in_odst.na_addr)))
8294 return 13;
8295 if (n1->in_osrc.na_atype != n2->in_osrc.na_atype)
8296 return 14;
8297 if (n1->in_osrc.na_function != n2->in_osrc.na_function)
8298 return 15;
8299 if (bcmp((char *)&n1->in_osrc.na_addr, (char *)&n2->in_osrc.na_addr,
8300 sizeof(n1->in_osrc.na_addr)))
8301 return 16;
8302 return 0;
8303 }
8304
8305
8306 /* ------------------------------------------------------------------------ */
8307 /* Function: ipf_nat_rule_init */
8308 /* Returns: int - 0 == success, else rules do not match. */
8309 /* Parameters: softc(I) - pointer to soft context main structure */
8310 /* softn(I) - pointer to NAT context structure */
8311 /* n(I) - first rule to compare */
8312 /* */
8313 /* ------------------------------------------------------------------------ */
8314 static int
8315 ipf_nat_rule_init(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n)
8316 {
8317 int error = 0;
8318
8319 if ((n->in_flags & IPN_SIPRANGE) != 0)
8320 n->in_nsrcatype = FRI_RANGE;
8321
8322 if ((n->in_flags & IPN_DIPRANGE) != 0)
8323 n->in_ndstatype = FRI_RANGE;
8324
8325 if ((n->in_flags & IPN_SPLIT) != 0)
8326 n->in_ndstatype = FRI_SPLIT;
8327
8328 if ((n->in_redir & (NAT_MAP|NAT_REWRITE|NAT_DIVERTUDP)) != 0)
8329 n->in_spnext = n->in_spmin;
8330
8331 if ((n->in_redir & (NAT_REWRITE|NAT_DIVERTUDP)) != 0) {
8332 n->in_dpnext = n->in_dpmin;
8333 } else if (n->in_redir == NAT_REDIRECT) {
8334 n->in_dpnext = n->in_dpmin;
8335 }
8336
8337 n->in_stepnext = 0;
8338
8339 switch (n->in_v[0])
8340 {
8341 case 4 :
8342 error = ipf_nat_ruleaddrinit(softc, softn, n);
8343 if (error != 0)
8344 return error;
8345 break;
8346 #ifdef USE_INET6
8347 case 6 :
8348 error = ipf_nat6_ruleaddrinit(softc, softn, n);
8349 if (error != 0)
8350 return error;
8351 break;
8352 #endif
8353 default :
8354 break;
8355 }
8356
8357 if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) {
8358 /*
8359 * Prerecord whether or not the destination of the divert
8360 * is local or not to the interface the packet is going
8361 * to be sent out.
8362 */
8363 n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1],
8364 n->in_ifps[1], &n->in_ndstip6);
8365 }
8366
8367 return error;
8368 }
8369
8370
8371 /* ------------------------------------------------------------------------ */
8372 /* Function: ipf_nat_rule_fini */
8373 /* Returns: int - 0 == success, else rules do not match. */
8374 /* Parameters: softc(I) - pointer to soft context main structure */
8375 /* n(I) - rule to work on */
8376 /* */
8377 /* This function is used to release any objects that were referenced during */
8378 /* the rule initialisation. This is useful both when free'ing the rule and */
8379 /* when handling ioctls that need to initialise these fields but not */
8380 /* actually use them after the ioctl processing has finished. */
8381 /* ------------------------------------------------------------------------ */
8382 static void
8383 ipf_nat_rule_fini(ipf_main_softc_t *softc, ipnat_t *n)
8384 {
8385 if (n->in_odst.na_atype == FRI_LOOKUP && n->in_odst.na_ptr != NULL)
8386 ipf_lookup_deref(softc, n->in_odst.na_type, n->in_odst.na_ptr);
8387
8388 if (n->in_osrc.na_atype == FRI_LOOKUP && n->in_osrc.na_ptr != NULL)
8389 ipf_lookup_deref(softc, n->in_osrc.na_type, n->in_osrc.na_ptr);
8390
8391 if (n->in_ndst.na_atype == FRI_LOOKUP && n->in_ndst.na_ptr != NULL)
8392 ipf_lookup_deref(softc, n->in_ndst.na_type, n->in_ndst.na_ptr);
8393
8394 if (n->in_nsrc.na_atype == FRI_LOOKUP && n->in_nsrc.na_ptr != NULL)
8395 ipf_lookup_deref(softc, n->in_nsrc.na_type, n->in_nsrc.na_ptr);
8396
8397 if (n->in_divmp != NULL)
8398 FREE_MB_T(n->in_divmp);
8399 }
8400