ip_flow.c revision 1.65 1 1.65 snj /* $NetBSD: ip_flow.c,v 1.65 2014/10/18 08:33:29 snj Exp $ */
2 1.1 matt
3 1.1 matt /*-
4 1.1 matt * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 1.1 matt * All rights reserved.
6 1.1 matt *
7 1.1 matt * This code is derived from software contributed to The NetBSD Foundation
8 1.1 matt * by the 3am Software Foundry ("3am"). It was developed by Matt Thomas.
9 1.1 matt *
10 1.1 matt * Redistribution and use in source and binary forms, with or without
11 1.1 matt * modification, are permitted provided that the following conditions
12 1.1 matt * are met:
13 1.1 matt * 1. Redistributions of source code must retain the above copyright
14 1.1 matt * notice, this list of conditions and the following disclaimer.
15 1.1 matt * 2. Redistributions in binary form must reproduce the above copyright
16 1.1 matt * notice, this list of conditions and the following disclaimer in the
17 1.1 matt * documentation and/or other materials provided with the distribution.
18 1.1 matt *
19 1.1 matt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 1.1 matt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 1.1 matt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 1.1 matt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 1.1 matt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 1.1 matt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 1.1 matt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 1.1 matt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 1.1 matt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 1.1 matt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 1.1 matt * POSSIBILITY OF SUCH DAMAGE.
30 1.1 matt */
31 1.22 lukem
32 1.22 lukem #include <sys/cdefs.h>
33 1.65 snj __KERNEL_RCSID(0, "$NetBSD: ip_flow.c,v 1.65 2014/10/18 08:33:29 snj Exp $");
34 1.1 matt
35 1.1 matt #include <sys/param.h>
36 1.1 matt #include <sys/systm.h>
37 1.1 matt #include <sys/malloc.h>
38 1.1 matt #include <sys/mbuf.h>
39 1.1 matt #include <sys/domain.h>
40 1.1 matt #include <sys/protosw.h>
41 1.1 matt #include <sys/socket.h>
42 1.1 matt #include <sys/socketvar.h>
43 1.1 matt #include <sys/errno.h>
44 1.1 matt #include <sys/time.h>
45 1.1 matt #include <sys/kernel.h>
46 1.7 thorpej #include <sys/pool.h>
47 1.1 matt #include <sys/sysctl.h>
48 1.1 matt
49 1.1 matt #include <net/if.h>
50 1.1 matt #include <net/if_dl.h>
51 1.1 matt #include <net/route.h>
52 1.1 matt #include <net/pfil.h>
53 1.1 matt
54 1.1 matt #include <netinet/in.h>
55 1.1 matt #include <netinet/in_systm.h>
56 1.1 matt #include <netinet/ip.h>
57 1.1 matt #include <netinet/in_pcb.h>
58 1.1 matt #include <netinet/in_var.h>
59 1.1 matt #include <netinet/ip_var.h>
60 1.54 thorpej #include <netinet/ip_private.h>
61 1.1 matt
62 1.44 liamjfoy /*
63 1.44 liamjfoy * Similar code is very well commented in netinet6/ip6_flow.c
64 1.44 liamjfoy */
65 1.44 liamjfoy
66 1.53 thorpej #define IPFLOW_HASHBITS 6 /* should not be a multiple of 8 */
67 1.53 thorpej
68 1.57 pooka static struct pool ipflow_pool;
69 1.7 thorpej
70 1.5 thorpej LIST_HEAD(ipflowhead, ipflow);
71 1.5 thorpej
72 1.1 matt #define IPFLOW_TIMER (5 * PR_SLOWHZ)
73 1.43 liamjfoy #define IPFLOW_DEFAULT_HASHSIZE (1 << IPFLOW_HASHBITS)
74 1.5 thorpej
75 1.43 liamjfoy static struct ipflowhead *ipflowtable = NULL;
76 1.5 thorpej static struct ipflowhead ipflowlist;
77 1.1 matt static int ipflow_inuse;
78 1.5 thorpej
79 1.5 thorpej #define IPFLOW_INSERT(bucket, ipf) \
80 1.5 thorpej do { \
81 1.5 thorpej LIST_INSERT_HEAD((bucket), (ipf), ipf_hash); \
82 1.5 thorpej LIST_INSERT_HEAD(&ipflowlist, (ipf), ipf_list); \
83 1.26 perry } while (/*CONSTCOND*/ 0)
84 1.5 thorpej
85 1.5 thorpej #define IPFLOW_REMOVE(ipf) \
86 1.5 thorpej do { \
87 1.5 thorpej LIST_REMOVE((ipf), ipf_hash); \
88 1.5 thorpej LIST_REMOVE((ipf), ipf_list); \
89 1.26 perry } while (/*CONSTCOND*/ 0)
90 1.5 thorpej
91 1.3 matt #ifndef IPFLOW_MAX
92 1.1 matt #define IPFLOW_MAX 256
93 1.3 matt #endif
94 1.64 rmind static int ip_maxflows = IPFLOW_MAX;
95 1.64 rmind static int ip_hashsize = IPFLOW_DEFAULT_HASHSIZE;
96 1.64 rmind
97 1.64 rmind static void ipflow_sysctl_init(struct sysctllog **);
98 1.1 matt
99 1.45 liamjfoy static size_t
100 1.51 dyoung ipflow_hash(const struct ip *ip)
101 1.1 matt {
102 1.45 liamjfoy size_t hash = ip->ip_tos;
103 1.45 liamjfoy size_t idx;
104 1.45 liamjfoy
105 1.45 liamjfoy for (idx = 0; idx < 32; idx += IPFLOW_HASHBITS) {
106 1.45 liamjfoy hash += (ip->ip_dst.s_addr >> (32 - idx)) +
107 1.45 liamjfoy (ip->ip_src.s_addr >> idx);
108 1.45 liamjfoy }
109 1.45 liamjfoy
110 1.43 liamjfoy return hash & (ip_hashsize-1);
111 1.1 matt }
112 1.1 matt
113 1.1 matt static struct ipflow *
114 1.51 dyoung ipflow_lookup(const struct ip *ip)
115 1.1 matt {
116 1.45 liamjfoy size_t hash;
117 1.1 matt struct ipflow *ipf;
118 1.1 matt
119 1.45 liamjfoy hash = ipflow_hash(ip);
120 1.1 matt
121 1.30 christos LIST_FOREACH(ipf, &ipflowtable[hash], ipf_hash) {
122 1.1 matt if (ip->ip_dst.s_addr == ipf->ipf_dst.s_addr
123 1.1 matt && ip->ip_src.s_addr == ipf->ipf_src.s_addr
124 1.1 matt && ip->ip_tos == ipf->ipf_tos)
125 1.1 matt break;
126 1.1 matt }
127 1.1 matt return ipf;
128 1.1 matt }
129 1.1 matt
130 1.57 pooka void
131 1.58 cegger ipflow_poolinit(void)
132 1.57 pooka {
133 1.57 pooka
134 1.57 pooka pool_init(&ipflow_pool, sizeof(struct ipflow), 0, 0, 0, "ipflowpl",
135 1.57 pooka NULL, IPL_NET);
136 1.57 pooka }
137 1.57 pooka
138 1.64 rmind static int
139 1.64 rmind ipflow_reinit(int table_size)
140 1.7 thorpej {
141 1.43 liamjfoy struct ipflowhead *new_table;
142 1.45 liamjfoy size_t i;
143 1.7 thorpej
144 1.43 liamjfoy new_table = (struct ipflowhead *)malloc(sizeof(struct ipflowhead) *
145 1.43 liamjfoy table_size, M_RTABLE, M_NOWAIT);
146 1.43 liamjfoy
147 1.43 liamjfoy if (new_table == NULL)
148 1.43 liamjfoy return 1;
149 1.43 liamjfoy
150 1.43 liamjfoy if (ipflowtable != NULL)
151 1.43 liamjfoy free(ipflowtable, M_RTABLE);
152 1.43 liamjfoy
153 1.43 liamjfoy ipflowtable = new_table;
154 1.43 liamjfoy ip_hashsize = table_size;
155 1.43 liamjfoy
156 1.7 thorpej LIST_INIT(&ipflowlist);
157 1.43 liamjfoy for (i = 0; i < ip_hashsize; i++)
158 1.7 thorpej LIST_INIT(&ipflowtable[i]);
159 1.43 liamjfoy
160 1.43 liamjfoy return 0;
161 1.7 thorpej }
162 1.7 thorpej
163 1.64 rmind void
164 1.64 rmind ipflow_init(void)
165 1.64 rmind {
166 1.64 rmind (void)ipflow_reinit(ip_hashsize);
167 1.64 rmind ipflow_sysctl_init(NULL);
168 1.64 rmind }
169 1.64 rmind
170 1.1 matt int
171 1.29 perry ipflow_fastforward(struct mbuf *m)
172 1.1 matt {
173 1.51 dyoung struct ip *ip;
174 1.51 dyoung struct ip ip_store;
175 1.1 matt struct ipflow *ipf;
176 1.1 matt struct rtentry *rt;
177 1.40 dyoung const struct sockaddr *dst;
178 1.1 matt int error;
179 1.6 sommerfe int iplen;
180 1.1 matt
181 1.1 matt /*
182 1.1 matt * Are we forwarding packets? Big enough for an IP packet?
183 1.1 matt */
184 1.3 matt if (!ipforwarding || ipflow_inuse == 0 || m->m_len < sizeof(struct ip))
185 1.1 matt return 0;
186 1.14 sommerfe
187 1.14 sommerfe /*
188 1.19 wiz * Was packet received as a link-level multicast or broadcast?
189 1.14 sommerfe * If so, don't try to fast forward..
190 1.14 sommerfe */
191 1.14 sommerfe if ((m->m_flags & (M_BCAST|M_MCAST)) != 0)
192 1.14 sommerfe return 0;
193 1.24 itojun
194 1.1 matt /*
195 1.1 matt * IP header with no option and valid version and length
196 1.1 matt */
197 1.51 dyoung if (IP_HDR_ALIGNED_P(mtod(m, const void *)))
198 1.25 thorpej ip = mtod(m, struct ip *);
199 1.25 thorpej else {
200 1.51 dyoung memcpy(&ip_store, mtod(m, const void *), sizeof(ip_store));
201 1.25 thorpej ip = &ip_store;
202 1.25 thorpej }
203 1.6 sommerfe iplen = ntohs(ip->ip_len);
204 1.5 thorpej if (ip->ip_v != IPVERSION || ip->ip_hl != (sizeof(struct ip) >> 2) ||
205 1.13 proff iplen < sizeof(struct ip) || iplen > m->m_pkthdr.len)
206 1.1 matt return 0;
207 1.1 matt /*
208 1.1 matt * Find a flow.
209 1.1 matt */
210 1.1 matt if ((ipf = ipflow_lookup(ip)) == NULL)
211 1.1 matt return 0;
212 1.1 matt
213 1.1 matt /*
214 1.18 thorpej * Verify the IP header checksum.
215 1.2 thorpej */
216 1.18 thorpej switch (m->m_pkthdr.csum_flags &
217 1.20 thorpej ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
218 1.18 thorpej M_CSUM_IPv4_BAD)) {
219 1.18 thorpej case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
220 1.18 thorpej return (0);
221 1.18 thorpej
222 1.18 thorpej case M_CSUM_IPv4:
223 1.18 thorpej /* Checksum was okay. */
224 1.18 thorpej break;
225 1.18 thorpej
226 1.18 thorpej default:
227 1.18 thorpej /* Must compute it ourselves. */
228 1.18 thorpej if (in_cksum(m, sizeof(struct ip)) != 0)
229 1.18 thorpej return (0);
230 1.18 thorpej break;
231 1.18 thorpej }
232 1.2 thorpej
233 1.2 thorpej /*
234 1.1 matt * Route and interface still up?
235 1.1 matt */
236 1.50 dyoung if ((rt = rtcache_validate(&ipf->ipf_ro)) == NULL ||
237 1.48 dyoung (rt->rt_ifp->if_flags & IFF_UP) == 0)
238 1.1 matt return 0;
239 1.1 matt
240 1.1 matt /*
241 1.1 matt * Packet size OK? TTL?
242 1.1 matt */
243 1.1 matt if (m->m_pkthdr.len > rt->rt_ifp->if_mtu || ip->ip_ttl <= IPTTLDEC)
244 1.1 matt return 0;
245 1.1 matt
246 1.1 matt /*
247 1.18 thorpej * Clear any in-bound checksum flags for this packet.
248 1.18 thorpej */
249 1.18 thorpej m->m_pkthdr.csum_flags = 0;
250 1.18 thorpej
251 1.18 thorpej /*
252 1.1 matt * Everything checks out and so we can forward this packet.
253 1.1 matt * Modify the TTL and incrementally change the checksum.
254 1.24 itojun *
255 1.9 mycroft * This method of adding the checksum works on either endian CPU.
256 1.9 mycroft * If htons() is inlined, all the arithmetic is folded; otherwise
257 1.32 perry * the htons()s are combined by CSE due to the const attribute.
258 1.18 thorpej *
259 1.18 thorpej * Don't bother using HW checksumming here -- the incremental
260 1.18 thorpej * update is pretty fast.
261 1.1 matt */
262 1.1 matt ip->ip_ttl -= IPTTLDEC;
263 1.12 itohy if (ip->ip_sum >= (u_int16_t) ~htons(IPTTLDEC << 8))
264 1.11 mycroft ip->ip_sum -= ~htons(IPTTLDEC << 8);
265 1.8 mycroft else
266 1.2 thorpej ip->ip_sum += htons(IPTTLDEC << 8);
267 1.25 thorpej
268 1.25 thorpej /*
269 1.25 thorpej * Done modifying the header; copy it back, if necessary.
270 1.51 dyoung *
271 1.51 dyoung * XXX Use m_copyback_cow(9) here? --dyoung
272 1.25 thorpej */
273 1.41 christos if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0)
274 1.41 christos memcpy(mtod(m, void *), &ip_store, sizeof(ip_store));
275 1.6 sommerfe
276 1.6 sommerfe /*
277 1.24 itojun * Trim the packet in case it's too long..
278 1.6 sommerfe */
279 1.6 sommerfe if (m->m_pkthdr.len > iplen) {
280 1.6 sommerfe if (m->m_len == m->m_pkthdr.len) {
281 1.6 sommerfe m->m_len = iplen;
282 1.6 sommerfe m->m_pkthdr.len = iplen;
283 1.6 sommerfe } else
284 1.6 sommerfe m_adj(m, iplen - m->m_pkthdr.len);
285 1.2 thorpej }
286 1.1 matt
287 1.1 matt /*
288 1.65 snj * Send the packet on its way. All we can get back is ENOBUFS
289 1.1 matt */
290 1.1 matt ipf->ipf_uses++;
291 1.5 thorpej PRT_SLOW_ARM(ipf->ipf_timer, IPFLOW_TIMER);
292 1.16 thorpej
293 1.16 thorpej if (rt->rt_flags & RTF_GATEWAY)
294 1.16 thorpej dst = rt->rt_gateway;
295 1.16 thorpej else
296 1.40 dyoung dst = rtcache_getdst(&ipf->ipf_ro);
297 1.16 thorpej
298 1.59 tls KERNEL_LOCK(1, NULL);
299 1.16 thorpej if ((error = (*rt->rt_ifp->if_output)(rt->rt_ifp, m, dst, rt)) != 0) {
300 1.1 matt if (error == ENOBUFS)
301 1.1 matt ipf->ipf_dropped++;
302 1.1 matt else
303 1.1 matt ipf->ipf_errors++;
304 1.1 matt }
305 1.59 tls KERNEL_UNLOCK_ONE(NULL);
306 1.1 matt return 1;
307 1.1 matt }
308 1.1 matt
309 1.1 matt static void
311 1.1 matt ipflow_addstats(struct ipflow *ipf)
312 1.49 dyoung {
313 1.54 thorpej struct rtentry *rt;
314 1.49 dyoung uint64_t *ips;
315 1.50 dyoung
316 1.49 dyoung if ((rt = rtcache_validate(&ipf->ipf_ro)) != NULL)
317 1.54 thorpej rt->rt_use += ipf->ipf_uses;
318 1.54 thorpej
319 1.54 thorpej ips = IP_STAT_GETREF();
320 1.54 thorpej ips[IP_STAT_CANTFORWARD] += ipf->ipf_errors + ipf->ipf_dropped;
321 1.54 thorpej ips[IP_STAT_TOTAL] += ipf->ipf_uses;
322 1.54 thorpej ips[IP_STAT_FORWARD] += ipf->ipf_uses;
323 1.54 thorpej ips[IP_STAT_FASTFORWARD] += ipf->ipf_uses;
324 1.1 matt IP_STAT_PUTREF();
325 1.1 matt }
326 1.1 matt
327 1.29 perry static void
328 1.1 matt ipflow_free(struct ipflow *ipf)
329 1.1 matt {
330 1.1 matt int s;
331 1.1 matt /*
332 1.1 matt * Remove the flow from the hash table (at elevated IPL).
333 1.1 matt * Once it's off the list, we can deal with it at normal
334 1.1 matt * network IPL.
335 1.17 thorpej */
336 1.5 thorpej s = splnet();
337 1.1 matt IPFLOW_REMOVE(ipf);
338 1.1 matt splx(s);
339 1.38 joerg ipflow_addstats(ipf);
340 1.1 matt rtcache_free(&ipf->ipf_ro);
341 1.35 tls ipflow_inuse--;
342 1.7 thorpej s = splnet();
343 1.35 tls pool_put(&ipflow_pool, ipf);
344 1.1 matt splx(s);
345 1.1 matt }
346 1.62 liamjfoy
347 1.53 thorpej struct ipflow *
348 1.1 matt ipflow_reap(bool just_one)
349 1.3 matt {
350 1.3 matt while (just_one || ipflow_inuse > ip_maxflows) {
351 1.3 matt struct ipflow *ipf, *maybe_ipf = NULL;
352 1.3 matt int s;
353 1.5 thorpej
354 1.5 thorpej ipf = LIST_FIRST(&ipflowlist);
355 1.5 thorpej while (ipf != NULL) {
356 1.5 thorpej /*
357 1.5 thorpej * If this no longer points to a valid route
358 1.5 thorpej * reclaim it.
359 1.50 dyoung */
360 1.5 thorpej if (rtcache_validate(&ipf->ipf_ro) == NULL)
361 1.5 thorpej goto done;
362 1.5 thorpej /*
363 1.5 thorpej * choose the one that's been least recently
364 1.5 thorpej * used or has had the least uses in the
365 1.5 thorpej * last 1.5 intervals.
366 1.5 thorpej */
367 1.5 thorpej if (maybe_ipf == NULL ||
368 1.5 thorpej ipf->ipf_timer < maybe_ipf->ipf_timer ||
369 1.5 thorpej (ipf->ipf_timer == maybe_ipf->ipf_timer &&
370 1.5 thorpej ipf->ipf_last_uses + ipf->ipf_uses <
371 1.5 thorpej maybe_ipf->ipf_last_uses +
372 1.5 thorpej maybe_ipf->ipf_uses))
373 1.5 thorpej maybe_ipf = ipf;
374 1.1 matt ipf = LIST_NEXT(ipf, ipf_list);
375 1.3 matt }
376 1.3 matt ipf = maybe_ipf;
377 1.3 matt done:
378 1.3 matt /*
379 1.3 matt * Remove the entry from the flow table.
380 1.17 thorpej */
381 1.5 thorpej s = splnet();
382 1.3 matt IPFLOW_REMOVE(ipf);
383 1.3 matt splx(s);
384 1.38 joerg ipflow_addstats(ipf);
385 1.3 matt rtcache_free(&ipf->ipf_ro);
386 1.3 matt if (just_one)
387 1.7 thorpej return ipf;
388 1.3 matt pool_put(&ipflow_pool, ipf);
389 1.1 matt ipflow_inuse--;
390 1.3 matt }
391 1.1 matt return NULL;
392 1.1 matt }
393 1.1 matt
394 1.29 perry void
395 1.1 matt ipflow_slowtimo(void)
396 1.49 dyoung {
397 1.5 thorpej struct rtentry *rt;
398 1.54 thorpej struct ipflow *ipf, *next_ipf;
399 1.2 thorpej uint64_t *ips;
400 1.55 ad
401 1.55 ad mutex_enter(softnet_lock);
402 1.30 christos KERNEL_LOCK(1, NULL);
403 1.5 thorpej for (ipf = LIST_FIRST(&ipflowlist); ipf != NULL; ipf = next_ipf) {
404 1.37 dyoung next_ipf = LIST_NEXT(ipf, ipf_list);
405 1.50 dyoung if (PRT_SLOW_ISEXPIRED(ipf->ipf_timer) ||
406 1.5 thorpej (rt = rtcache_validate(&ipf->ipf_ro)) == NULL) {
407 1.5 thorpej ipflow_free(ipf);
408 1.5 thorpej } else {
409 1.49 dyoung ipf->ipf_last_uses = ipf->ipf_uses;
410 1.54 thorpej rt->rt_use += ipf->ipf_uses;
411 1.54 thorpej ips = IP_STAT_GETREF();
412 1.54 thorpej ips[IP_STAT_TOTAL] += ipf->ipf_uses;
413 1.54 thorpej ips[IP_STAT_FORWARD] += ipf->ipf_uses;
414 1.54 thorpej ips[IP_STAT_FASTFORWARD] += ipf->ipf_uses;
415 1.5 thorpej IP_STAT_PUTREF();
416 1.1 matt ipf->ipf_uses = 0;
417 1.1 matt }
418 1.55 ad }
419 1.55 ad KERNEL_UNLOCK_ONE(NULL);
420 1.1 matt mutex_exit(softnet_lock);
421 1.1 matt }
422 1.1 matt
423 1.29 perry void
424 1.1 matt ipflow_create(const struct route *ro, struct mbuf *m)
425 1.51 dyoung {
426 1.1 matt const struct ip *const ip = mtod(m, const struct ip *);
427 1.45 liamjfoy struct ipflow *ipf;
428 1.1 matt size_t hash;
429 1.1 matt int s;
430 1.1 matt
431 1.1 matt /*
432 1.1 matt * Don't create cache entries for ICMP messages.
433 1.3 matt */
434 1.1 matt if (ip_maxflows == 0 || ip->ip_p == IPPROTO_ICMP)
435 1.63 pooka return;
436 1.63 pooka
437 1.63 pooka KERNEL_LOCK(1, NULL);
438 1.1 matt
439 1.65 snj /*
440 1.1 matt * See if an existing flow struct exists. If so remove it from its
441 1.1 matt * list and free the old route. If not, try to malloc a new one
442 1.1 matt * (if we aren't at our limit).
443 1.1 matt */
444 1.1 matt ipf = ipflow_lookup(ip);
445 1.3 matt if (ipf == NULL) {
446 1.53 thorpej if (ipflow_inuse >= ip_maxflows) {
447 1.1 matt ipf = ipflow_reap(true);
448 1.36 mrg } else {
449 1.7 thorpej s = splnet();
450 1.35 tls ipf = pool_get(&ipflow_pool, PR_NOWAIT);
451 1.1 matt splx(s);
452 1.63 pooka if (ipf == NULL)
453 1.1 matt goto out;
454 1.1 matt ipflow_inuse++;
455 1.39 dyoung }
456 1.1 matt memset(ipf, 0, sizeof(*ipf));
457 1.17 thorpej } else {
458 1.5 thorpej s = splnet();
459 1.1 matt IPFLOW_REMOVE(ipf);
460 1.1 matt splx(s);
461 1.38 joerg ipflow_addstats(ipf);
462 1.1 matt rtcache_free(&ipf->ipf_ro);
463 1.1 matt ipf->ipf_uses = ipf->ipf_last_uses = 0;
464 1.1 matt ipf->ipf_errors = ipf->ipf_dropped = 0;
465 1.1 matt }
466 1.1 matt
467 1.1 matt /*
468 1.1 matt * Fill in the updated information.
469 1.46 dyoung */
470 1.1 matt rtcache_copy(&ipf->ipf_ro, ro);
471 1.1 matt ipf->ipf_dst = ip->ip_dst;
472 1.1 matt ipf->ipf_src = ip->ip_src;
473 1.5 thorpej ipf->ipf_tos = ip->ip_tos;
474 1.60 liamjfoy PRT_SLOW_ARM(ipf->ipf_timer, IPFLOW_TIMER);
475 1.1 matt
476 1.1 matt /*
477 1.1 matt * Insert into the approriate bucket of the flow table.
478 1.45 liamjfoy */
479 1.17 thorpej hash = ipflow_hash(ip);
480 1.5 thorpej s = splnet();
481 1.27 scw IPFLOW_INSERT(&ipflowtable[hash], ipf);
482 1.63 pooka splx(s);
483 1.63 pooka
484 1.63 pooka out:
485 1.27 scw KERNEL_UNLOCK_ONE(NULL);
486 1.27 scw }
487 1.43 liamjfoy
488 1.43 liamjfoy int
489 1.27 scw ipflow_invalidate_all(int new_size)
490 1.27 scw {
491 1.43 liamjfoy struct ipflow *ipf, *next_ipf;
492 1.27 scw int s, error;
493 1.43 liamjfoy
494 1.27 scw error = 0;
495 1.27 scw s = splnet();
496 1.27 scw for (ipf = LIST_FIRST(&ipflowlist); ipf != NULL; ipf = next_ipf) {
497 1.27 scw next_ipf = LIST_NEXT(ipf, ipf_list);
498 1.27 scw ipflow_free(ipf);
499 1.43 liamjfoy }
500 1.43 liamjfoy
501 1.64 rmind if (new_size)
502 1.1 matt error = ipflow_reinit(new_size);
503 1.43 liamjfoy splx(s);
504 1.43 liamjfoy
505 1.1 matt return error;
506 1.64 rmind }
507 1.64 rmind
508 1.64 rmind #ifdef GATEWAY
509 1.64 rmind /*
510 1.64 rmind * sysctl helper routine for net.inet.ip.maxflows.
511 1.64 rmind */
512 1.64 rmind static int
513 1.64 rmind sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
514 1.64 rmind {
515 1.64 rmind int error;
516 1.64 rmind
517 1.64 rmind error = sysctl_lookup(SYSCTLFN_CALL(rnode));
518 1.64 rmind if (error || newp == NULL)
519 1.64 rmind return (error);
520 1.64 rmind
521 1.64 rmind mutex_enter(softnet_lock);
522 1.64 rmind KERNEL_LOCK(1, NULL);
523 1.64 rmind
524 1.64 rmind ipflow_reap(false);
525 1.64 rmind
526 1.64 rmind KERNEL_UNLOCK_ONE(NULL);
527 1.64 rmind mutex_exit(softnet_lock);
528 1.64 rmind
529 1.64 rmind return (0);
530 1.64 rmind }
531 1.64 rmind
532 1.64 rmind static int
533 1.64 rmind sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
534 1.64 rmind {
535 1.64 rmind int error, tmp;
536 1.64 rmind struct sysctlnode node;
537 1.64 rmind
538 1.64 rmind node = *rnode;
539 1.64 rmind tmp = ip_hashsize;
540 1.64 rmind node.sysctl_data = &tmp;
541 1.64 rmind error = sysctl_lookup(SYSCTLFN_CALL(&node));
542 1.64 rmind if (error || newp == NULL)
543 1.64 rmind return (error);
544 1.64 rmind
545 1.64 rmind if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
546 1.64 rmind /*
547 1.64 rmind * Can only fail due to malloc()
548 1.64 rmind */
549 1.64 rmind mutex_enter(softnet_lock);
550 1.64 rmind KERNEL_LOCK(1, NULL);
551 1.64 rmind
552 1.64 rmind error = ipflow_invalidate_all(tmp);
553 1.64 rmind
554 1.64 rmind KERNEL_UNLOCK_ONE(NULL);
555 1.64 rmind mutex_exit(softnet_lock);
556 1.64 rmind
557 1.64 rmind } else {
558 1.64 rmind /*
559 1.64 rmind * EINVAL if not a power of 2
560 1.64 rmind */
561 1.64 rmind error = EINVAL;
562 1.64 rmind }
563 1.64 rmind
564 1.64 rmind return error;
565 1.64 rmind }
566 1.64 rmind #endif /* GATEWAY */
567 1.64 rmind
568 1.64 rmind static void
569 1.64 rmind ipflow_sysctl_init(struct sysctllog **clog)
570 1.64 rmind {
571 1.64 rmind sysctl_createv(clog, 0, NULL, NULL,
572 1.64 rmind CTLFLAG_PERMANENT,
573 1.64 rmind CTLTYPE_NODE, "inet",
574 1.64 rmind SYSCTL_DESCR("PF_INET related settings"),
575 1.64 rmind NULL, 0, NULL, 0,
576 1.64 rmind CTL_NET, PF_INET, CTL_EOL);
577 1.64 rmind sysctl_createv(clog, 0, NULL, NULL,
578 1.64 rmind CTLFLAG_PERMANENT,
579 1.64 rmind CTLTYPE_NODE, "ip",
580 1.64 rmind SYSCTL_DESCR("IPv4 related settings"),
581 1.64 rmind NULL, 0, NULL, 0,
582 1.64 rmind CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
583 1.64 rmind
584 1.64 rmind #ifdef GATEWAY
585 1.64 rmind sysctl_createv(clog, 0, NULL, NULL,
586 1.64 rmind CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
587 1.64 rmind CTLTYPE_INT, "maxflows",
588 1.64 rmind SYSCTL_DESCR("Number of flows for fast forwarding"),
589 1.64 rmind sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
590 1.64 rmind CTL_NET, PF_INET, IPPROTO_IP,
591 1.64 rmind IPCTL_MAXFLOWS, CTL_EOL);
592 1.64 rmind sysctl_createv(clog, 0, NULL, NULL,
593 1.64 rmind CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
594 1.64 rmind CTLTYPE_INT, "hashsize",
595 1.64 rmind SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
596 1.64 rmind sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
597 1.64 rmind CTL_NET, PF_INET, IPPROTO_IP,
598 1.64 rmind CTL_CREATE, CTL_EOL);
599 1.64 rmind #endif /* GATEWAY */
600 }
601