if_spppsubr.c revision 1.87.4.3 1 /* $NetBSD: if_spppsubr.c,v 1.87.4.3 2006/06/01 22:38:37 kardel Exp $ */
2
3 /*
4 * Synchronous PPP/Cisco link level subroutines.
5 * Keepalive protocol implemented in both Cisco and PPP modes.
6 *
7 * Copyright (C) 1994-1996 Cronyx Engineering Ltd.
8 * Author: Serge Vakulenko, <vak (at) cronyx.ru>
9 *
10 * Heavily revamped to conform to RFC 1661.
11 * Copyright (C) 1997, Joerg Wunsch.
12 *
13 * RFC2472 IPv6CP support.
14 * Copyright (C) 2000, Jun-ichiro itojun Hagino <itojun (at) iijlab.net>.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions are met:
18 * 1. Redistributions of source code must retain the above copyright notice,
19 * this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright notice,
21 * this list of conditions and the following disclaimer in the documentation
22 * and/or other materials provided with the distribution.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND ANY
25 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 *
36 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997
37 *
38 * From: if_spppsubr.c,v 1.39 1998/04/04 13:26:03 phk Exp
39 *
40 * From: Id: if_spppsubr.c,v 1.23 1999/02/23 14:47:50 hm Exp
41 */
42
43 #include <sys/cdefs.h>
44 __KERNEL_RCSID(0, "$NetBSD: if_spppsubr.c,v 1.87.4.3 2006/06/01 22:38:37 kardel Exp $");
45
46 #include "opt_inet.h"
47 #include "opt_ipx.h"
48 #include "opt_iso.h"
49 #include "opt_ns.h"
50 #include "opt_pfil_hooks.h"
51
52 #include <sys/param.h>
53 #include <sys/proc.h>
54 #include <sys/systm.h>
55 #include <sys/kernel.h>
56 #include <sys/sockio.h>
57 #include <sys/socket.h>
58 #include <sys/syslog.h>
59 #include <sys/malloc.h>
60 #include <sys/mbuf.h>
61 #include <sys/callout.h>
62 #include <sys/md5.h>
63 #include <sys/inttypes.h>
64 #include <sys/kauth.h>
65
66 #include <net/if.h>
67 #include <net/netisr.h>
68 #include <net/if_types.h>
69 #include <net/route.h>
70 #include <net/ppp_defs.h>
71
72 #include <machine/stdarg.h>
73
74 #include <netinet/in.h>
75 #include <netinet/in_systm.h>
76 #include <netinet/in_var.h>
77 #ifdef INET
78 #include <netinet/ip.h>
79 #include <netinet/tcp.h>
80 #endif
81 #include <net/ethertypes.h>
82
83 #ifdef INET6
84 #include <netinet6/scope6_var.h>
85 #endif
86
87 #ifdef IPX
88 #include <netipx/ipx.h>
89 #include <netipx/ipx_if.h>
90 #endif
91
92 #ifdef NS
93 #include <netns/ns.h>
94 #include <netns/ns_if.h>
95 #endif
96
97 #ifdef ISO
98 #include <netiso/argo_debug.h>
99 #include <netiso/iso.h>
100 #include <netiso/iso_var.h>
101 #include <netiso/iso_snpac.h>
102 #endif
103
104 #include <net/if_sppp.h>
105 #include <net/if_spppvar.h>
106
107 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */
108 #define LOOPALIVECNT 3 /* loopback detection tries */
109 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */
110 #define DEFAULT_NORECV_TIME 15 /* before we get worried */
111 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */
112
113 /*
114 * Interface flags that can be set in an ifconfig command.
115 *
116 * Setting link0 will make the link passive, i.e. it will be marked
117 * as being administrative openable, but won't be opened to begin
118 * with. Incoming calls will be answered, or subsequent calls with
119 * -link1 will cause the administrative open of the LCP layer.
120 *
121 * Setting link1 will cause the link to auto-dial only as packets
122 * arrive to be sent.
123 *
124 * Setting IFF_DEBUG will syslog the option negotiation and state
125 * transitions at level kern.debug. Note: all logs consistently look
126 * like
127 *
128 * <if-name><unit>: <proto-name> <additional info...>
129 *
130 * with <if-name><unit> being something like "bppp0", and <proto-name>
131 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
132 */
133
134 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
135 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */
136
137 #define CONF_REQ 1 /* PPP configure request */
138 #define CONF_ACK 2 /* PPP configure acknowledge */
139 #define CONF_NAK 3 /* PPP configure negative ack */
140 #define CONF_REJ 4 /* PPP configure reject */
141 #define TERM_REQ 5 /* PPP terminate request */
142 #define TERM_ACK 6 /* PPP terminate acknowledge */
143 #define CODE_REJ 7 /* PPP code reject */
144 #define PROTO_REJ 8 /* PPP protocol reject */
145 #define ECHO_REQ 9 /* PPP echo request */
146 #define ECHO_REPLY 10 /* PPP echo reply */
147 #define DISC_REQ 11 /* PPP discard request */
148
149 #define LCP_OPT_MRU 1 /* maximum receive unit */
150 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */
151 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
152 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
153 #define LCP_OPT_MAGIC 5 /* magic number */
154 #define LCP_OPT_RESERVED 6 /* reserved */
155 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
156 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
157
158 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */
159 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */
160 #define IPCP_OPT_ADDRESS 3 /* local IP address */
161 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */
162 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */
163
164 #define IPV6CP_OPT_IFID 1 /* interface identifier */
165 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */
166
167 #define PAP_REQ 1 /* PAP name/password request */
168 #define PAP_ACK 2 /* PAP acknowledge */
169 #define PAP_NAK 3 /* PAP fail */
170
171 #define CHAP_CHALLENGE 1 /* CHAP challenge request */
172 #define CHAP_RESPONSE 2 /* CHAP challenge response */
173 #define CHAP_SUCCESS 3 /* CHAP response ok */
174 #define CHAP_FAILURE 4 /* CHAP response failed */
175
176 #define CHAP_MD5 5 /* hash algorithm - MD5 */
177
178 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */
179 #define CISCO_UNICAST 0x0f /* Cisco unicast address */
180 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
181 #define CISCO_ADDR_REQ 0 /* Cisco address request */
182 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
183 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
184
185 /* states are named and numbered according to RFC 1661 */
186 #define STATE_INITIAL 0
187 #define STATE_STARTING 1
188 #define STATE_CLOSED 2
189 #define STATE_STOPPED 3
190 #define STATE_CLOSING 4
191 #define STATE_STOPPING 5
192 #define STATE_REQ_SENT 6
193 #define STATE_ACK_RCVD 7
194 #define STATE_ACK_SENT 8
195 #define STATE_OPENED 9
196
197 struct ppp_header {
198 u_int8_t address;
199 u_int8_t control;
200 u_int16_t protocol;
201 } __attribute__((__packed__));
202 #define PPP_HEADER_LEN sizeof (struct ppp_header)
203
204 struct lcp_header {
205 u_int8_t type;
206 u_int8_t ident;
207 u_int16_t len;
208 } __attribute__((__packed__));
209 #define LCP_HEADER_LEN sizeof (struct lcp_header)
210
211 struct cisco_packet {
212 u_int32_t type;
213 u_int32_t par1;
214 u_int32_t par2;
215 u_int16_t rel;
216 u_int16_t time0;
217 u_int16_t time1;
218 } __attribute__((__packed__));
219 #define CISCO_PACKET_LEN 18
220
221 /*
222 * We follow the spelling and capitalization of RFC 1661 here, to make
223 * it easier comparing with the standard. Please refer to this RFC in
224 * case you can't make sense out of these abbreviation; it will also
225 * explain the semantics related to the various events and actions.
226 */
227 struct cp {
228 u_short proto; /* PPP control protocol number */
229 u_char protoidx; /* index into state table in struct sppp */
230 u_char flags;
231 #define CP_LCP 0x01 /* this is the LCP */
232 #define CP_AUTH 0x02 /* this is an authentication protocol */
233 #define CP_NCP 0x04 /* this is a NCP */
234 #define CP_QUAL 0x08 /* this is a quality reporting protocol */
235 const char *name; /* name of this control protocol */
236 /* event handlers */
237 void (*Up)(struct sppp *sp);
238 void (*Down)(struct sppp *sp);
239 void (*Open)(struct sppp *sp);
240 void (*Close)(struct sppp *sp);
241 void (*TO)(void *sp);
242 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
243 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
244 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
245 /* actions */
246 void (*tlu)(struct sppp *sp);
247 void (*tld)(struct sppp *sp);
248 void (*tls)(struct sppp *sp);
249 void (*tlf)(struct sppp *sp);
250 void (*scr)(struct sppp *sp);
251 };
252
253 static struct sppp *spppq;
254 static struct callout keepalive_ch;
255
256 #ifdef INET
257 /*
258 * The following disgusting hack gets around the problem that IP TOS
259 * can't be set yet. We want to put "interactive" traffic on a high
260 * priority queue. To decide if traffic is interactive, we check that
261 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
262 *
263 * XXX is this really still necessary? - joerg -
264 */
265 static u_short interactive_ports[8] = {
266 0, 513, 0, 0,
267 0, 21, 0, 23,
268 };
269 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
270 #endif
271
272 /* almost every function needs these */
273 #define STDDCL \
274 struct ifnet *ifp = &sp->pp_if; \
275 int debug = ifp->if_flags & IFF_DEBUG
276
277 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
278 struct sockaddr *dst, struct rtentry *rt);
279
280 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2);
281 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
282
283 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
284 struct mbuf *m);
285 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
286 u_char ident, u_short len, void *data);
287 /* static void sppp_cp_timeout(void *arg); */
288 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
289 int newstate);
290 static void sppp_auth_send(const struct cp *cp,
291 struct sppp *sp, unsigned int type, unsigned int id,
292 ...);
293
294 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
295 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
296 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
297 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
298 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
299
300 static void sppp_null(struct sppp *sp);
301
302 static void sppp_lcp_init(struct sppp *sp);
303 static void sppp_lcp_up(struct sppp *sp);
304 static void sppp_lcp_down(struct sppp *sp);
305 static void sppp_lcp_open(struct sppp *sp);
306 static void sppp_lcp_close(struct sppp *sp);
307 static void sppp_lcp_TO(void *sp);
308 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
309 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
310 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
311 static void sppp_lcp_tlu(struct sppp *sp);
312 static void sppp_lcp_tld(struct sppp *sp);
313 static void sppp_lcp_tls(struct sppp *sp);
314 static void sppp_lcp_tlf(struct sppp *sp);
315 static void sppp_lcp_scr(struct sppp *sp);
316 static void sppp_lcp_check_and_close(struct sppp *sp);
317 static int sppp_ncp_check(struct sppp *sp);
318
319 static void sppp_ipcp_init(struct sppp *sp);
320 static void sppp_ipcp_up(struct sppp *sp);
321 static void sppp_ipcp_down(struct sppp *sp);
322 static void sppp_ipcp_open(struct sppp *sp);
323 static void sppp_ipcp_close(struct sppp *sp);
324 static void sppp_ipcp_TO(void *sp);
325 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
326 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
327 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
328 static void sppp_ipcp_tlu(struct sppp *sp);
329 static void sppp_ipcp_tld(struct sppp *sp);
330 static void sppp_ipcp_tls(struct sppp *sp);
331 static void sppp_ipcp_tlf(struct sppp *sp);
332 static void sppp_ipcp_scr(struct sppp *sp);
333
334 static void sppp_ipv6cp_init(struct sppp *sp);
335 static void sppp_ipv6cp_up(struct sppp *sp);
336 static void sppp_ipv6cp_down(struct sppp *sp);
337 static void sppp_ipv6cp_open(struct sppp *sp);
338 static void sppp_ipv6cp_close(struct sppp *sp);
339 static void sppp_ipv6cp_TO(void *sp);
340 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
341 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
342 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
343 static void sppp_ipv6cp_tlu(struct sppp *sp);
344 static void sppp_ipv6cp_tld(struct sppp *sp);
345 static void sppp_ipv6cp_tls(struct sppp *sp);
346 static void sppp_ipv6cp_tlf(struct sppp *sp);
347 static void sppp_ipv6cp_scr(struct sppp *sp);
348
349 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
350 static void sppp_pap_init(struct sppp *sp);
351 static void sppp_pap_open(struct sppp *sp);
352 static void sppp_pap_close(struct sppp *sp);
353 static void sppp_pap_TO(void *sp);
354 static void sppp_pap_my_TO(void *sp);
355 static void sppp_pap_tlu(struct sppp *sp);
356 static void sppp_pap_tld(struct sppp *sp);
357 static void sppp_pap_scr(struct sppp *sp);
358
359 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
360 static void sppp_chap_init(struct sppp *sp);
361 static void sppp_chap_open(struct sppp *sp);
362 static void sppp_chap_close(struct sppp *sp);
363 static void sppp_chap_TO(void *sp);
364 static void sppp_chap_tlu(struct sppp *sp);
365 static void sppp_chap_tld(struct sppp *sp);
366 static void sppp_chap_scr(struct sppp *sp);
367
368 static const char *sppp_auth_type_name(u_short proto, u_char type);
369 static const char *sppp_cp_type_name(u_char type);
370 static const char *sppp_dotted_quad(u_int32_t addr);
371 static const char *sppp_ipcp_opt_name(u_char opt);
372 #ifdef INET6
373 static const char *sppp_ipv6cp_opt_name(u_char opt);
374 #endif
375 static const char *sppp_lcp_opt_name(u_char opt);
376 static const char *sppp_phase_name(int phase);
377 static const char *sppp_proto_name(u_short proto);
378 static const char *sppp_state_name(int state);
379 static int sppp_params(struct sppp *sp, int cmd, void *data);
380 #ifdef INET
381 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst,
382 u_int32_t *srcmask);
383 static void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr);
384 static void sppp_clear_ip_addrs(struct sppp *sp);
385 #endif
386 static void sppp_keepalive(void *dummy);
387 static void sppp_phase_network(struct sppp *sp);
388 static void sppp_print_bytes(const u_char *p, u_short len);
389 static void sppp_print_string(const char *p, u_short len);
390 #ifdef INET6
391 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
392 struct in6_addr *dst, struct in6_addr *srcmask);
393 #ifdef IPV6CP_MYIFID_DYN
394 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
395 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
396 #endif
397 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
398 #endif
399
400 /* our control protocol descriptors */
401 static const struct cp lcp = {
402 PPP_LCP, IDX_LCP, CP_LCP, "lcp",
403 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
404 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
405 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
406 sppp_lcp_scr
407 };
408
409 static const struct cp ipcp = {
410 PPP_IPCP, IDX_IPCP,
411 #ifdef INET
412 CP_NCP, /*don't run IPCP if there's no IPv4 support*/
413 #else
414 0,
415 #endif
416 "ipcp",
417 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
418 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
419 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
420 sppp_ipcp_scr
421 };
422
423 static const struct cp ipv6cp = {
424 PPP_IPV6CP, IDX_IPV6CP,
425 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/
426 CP_NCP,
427 #else
428 0,
429 #endif
430 "ipv6cp",
431 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
432 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
433 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
434 sppp_ipv6cp_scr
435 };
436
437 static const struct cp pap = {
438 PPP_PAP, IDX_PAP, CP_AUTH, "pap",
439 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
440 sppp_pap_TO, 0, 0, 0,
441 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
442 sppp_pap_scr
443 };
444
445 static const struct cp chap = {
446 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
447 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
448 sppp_chap_TO, 0, 0, 0,
449 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
450 sppp_chap_scr
451 };
452
453 static const struct cp *cps[IDX_COUNT] = {
454 &lcp, /* IDX_LCP */
455 &ipcp, /* IDX_IPCP */
456 &ipv6cp, /* IDX_IPV6CP */
457 &pap, /* IDX_PAP */
458 &chap, /* IDX_CHAP */
459 };
460
461
462 void spppattach(int);
463 void
464 /*ARGSUSED*/
465 spppattach(int count)
466 {
467 }
468
469 /*
470 * Exported functions, comprising our interface to the lower layer.
471 */
472
473 /*
474 * Process the received packet.
475 */
476 void
477 sppp_input(struct ifnet *ifp, struct mbuf *m)
478 {
479 struct ppp_header *h = NULL;
480 struct ifqueue *inq = 0;
481 u_int16_t protocol;
482 int s;
483 struct sppp *sp = (struct sppp *)ifp;
484 int debug = ifp->if_flags & IFF_DEBUG;
485
486 if (ifp->if_flags & IFF_UP) {
487 /* Count received bytes, add hardware framing */
488 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes;
489 /* Note time of last receive */
490 sp->pp_last_receive = time_uptime;
491 }
492
493 if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
494 /* Too small packet, drop it. */
495 if (debug)
496 log(LOG_DEBUG,
497 "%s: input packet is too small, %d bytes\n",
498 ifp->if_xname, m->m_pkthdr.len);
499 drop:
500 ++ifp->if_ierrors;
501 ++ifp->if_iqdrops;
502 m_freem(m);
503 return;
504 }
505
506 if (sp->pp_flags & PP_NOFRAMING) {
507 memcpy(&protocol, mtod(m, void *), 2);
508 protocol = ntohs(protocol);
509 m_adj(m, 2);
510 } else {
511
512 /* Get PPP header. */
513 h = mtod(m, struct ppp_header *);
514 m_adj(m, PPP_HEADER_LEN);
515
516 switch (h->address) {
517 case PPP_ALLSTATIONS:
518 if (h->control != PPP_UI)
519 goto invalid;
520 if (sp->pp_flags & PP_CISCO) {
521 if (debug)
522 log(LOG_DEBUG,
523 "%s: PPP packet in Cisco mode "
524 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
525 ifp->if_xname,
526 h->address, h->control, ntohs(h->protocol));
527 goto drop;
528 }
529 break;
530 case CISCO_MULTICAST:
531 case CISCO_UNICAST:
532 /* Don't check the control field here (RFC 1547). */
533 if (! (sp->pp_flags & PP_CISCO)) {
534 if (debug)
535 log(LOG_DEBUG,
536 "%s: Cisco packet in PPP mode "
537 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
538 ifp->if_xname,
539 h->address, h->control, ntohs(h->protocol));
540 goto drop;
541 }
542 switch (ntohs(h->protocol)) {
543 default:
544 ++ifp->if_noproto;
545 goto invalid;
546 case CISCO_KEEPALIVE:
547 sppp_cisco_input((struct sppp *) ifp, m);
548 m_freem(m);
549 return;
550 #ifdef INET
551 case ETHERTYPE_IP:
552 schednetisr(NETISR_IP);
553 inq = &ipintrq;
554 break;
555 #endif
556 #ifdef INET6
557 case ETHERTYPE_IPV6:
558 schednetisr(NETISR_IPV6);
559 inq = &ip6intrq;
560 break;
561 #endif
562 #ifdef IPX
563 case ETHERTYPE_IPX:
564 schednetisr(NETISR_IPX);
565 inq = &ipxintrq;
566 break;
567 #endif
568 #ifdef NS
569 case ETHERTYPE_NS:
570 schednetisr(NETISR_NS);
571 inq = &nsintrq;
572 break;
573 #endif
574 }
575 goto queue_pkt;
576 default: /* Invalid PPP packet. */
577 invalid:
578 if (debug)
579 log(LOG_DEBUG,
580 "%s: invalid input packet "
581 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
582 ifp->if_xname,
583 h->address, h->control, ntohs(h->protocol));
584 goto drop;
585 }
586 protocol = ntohs(h->protocol);
587 }
588
589 switch (protocol) {
590 default:
591 if (sp->state[IDX_LCP] == STATE_OPENED) {
592 u_int16_t prot = htons(protocol);
593 sppp_cp_send(sp, PPP_LCP, PROTO_REJ,
594 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
595 &prot);
596 }
597 if (debug)
598 log(LOG_DEBUG,
599 "%s: invalid input protocol "
600 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol));
601 ++ifp->if_noproto;
602 goto drop;
603 case PPP_LCP:
604 sppp_cp_input(&lcp, sp, m);
605 m_freem(m);
606 return;
607 case PPP_PAP:
608 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE)
609 sppp_pap_input(sp, m);
610 m_freem(m);
611 return;
612 case PPP_CHAP:
613 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE)
614 sppp_chap_input(sp, m);
615 m_freem(m);
616 return;
617 #ifdef INET
618 case PPP_IPCP:
619 if (sp->pp_phase == SPPP_PHASE_NETWORK)
620 sppp_cp_input(&ipcp, sp, m);
621 m_freem(m);
622 return;
623 case PPP_IP:
624 if (sp->state[IDX_IPCP] == STATE_OPENED) {
625 schednetisr(NETISR_IP);
626 inq = &ipintrq;
627 sp->pp_last_activity = time_uptime;
628 }
629 break;
630 #endif
631 #ifdef INET6
632 case PPP_IPV6CP:
633 if (sp->pp_phase == SPPP_PHASE_NETWORK)
634 sppp_cp_input(&ipv6cp, sp, m);
635 m_freem(m);
636 return;
637
638 case PPP_IPV6:
639 if (sp->state[IDX_IPV6CP] == STATE_OPENED) {
640 schednetisr(NETISR_IPV6);
641 inq = &ip6intrq;
642 sp->pp_last_activity = time_uptime;
643 }
644 break;
645 #endif
646 #ifdef IPX
647 case PPP_IPX:
648 /* IPX IPXCP not implemented yet */
649 if (sp->pp_phase == SPPP_PHASE_NETWORK) {
650 schednetisr(NETISR_IPX);
651 inq = &ipxintrq;
652 }
653 break;
654 #endif
655 #ifdef NS
656 case PPP_XNS:
657 /* XNS IDPCP not implemented yet */
658 if (sp->pp_phase == SPPP_PHASE_NETWORK) {
659 schednetisr(NETISR_NS);
660 inq = &nsintrq;
661 }
662 break;
663 #endif
664 #ifdef ISO
665 case PPP_ISO:
666 /* OSI NLCP not implemented yet */
667 if (sp->pp_phase == SPPP_PHASE_NETWORK) {
668 schednetisr(NETISR_ISO);
669 inq = &clnlintrq;
670 }
671 break;
672 #endif
673 }
674
675 queue_pkt:
676 if (! (ifp->if_flags & IFF_UP) || ! inq)
677 goto drop;
678
679 /* Check queue. */
680 s = splnet();
681 if (IF_QFULL(inq)) {
682 /* Queue overflow. */
683 IF_DROP(inq);
684 splx(s);
685 if (debug)
686 log(LOG_DEBUG, "%s: protocol queue overflow\n",
687 ifp->if_xname);
688 goto drop;
689 }
690 IF_ENQUEUE(inq, m);
691 splx(s);
692 }
693
694 /*
695 * Enqueue transmit packet.
696 */
697 static int
698 sppp_output(struct ifnet *ifp, struct mbuf *m,
699 struct sockaddr *dst, struct rtentry *rt)
700 {
701 struct sppp *sp = (struct sppp *) ifp;
702 struct ppp_header *h = NULL;
703 struct ifqueue *ifq = NULL; /* XXX */
704 int s, error = 0;
705 u_int16_t protocol;
706 ALTQ_DECL(struct altq_pktattr pktattr;)
707
708 s = splnet();
709
710 sp->pp_last_activity = time_uptime;
711
712 if ((ifp->if_flags & IFF_UP) == 0 ||
713 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
714 m_freem(m);
715 splx(s);
716 return (ENETDOWN);
717 }
718
719 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
720 /*
721 * Interface is not yet running, but auto-dial. Need
722 * to start LCP for it.
723 */
724 ifp->if_flags |= IFF_RUNNING;
725 splx(s);
726 lcp.Open(sp);
727 s = splnet();
728 }
729
730 /*
731 * If the queueing discipline needs packet classification,
732 * do it before prepending link headers.
733 */
734 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr);
735
736 #ifdef INET
737 if (dst->sa_family == AF_INET) {
738 struct ip *ip = NULL;
739 struct tcphdr *th = NULL;
740
741 if (m->m_len >= sizeof(struct ip)) {
742 ip = mtod(m, struct ip *);
743 if (ip->ip_p == IPPROTO_TCP &&
744 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) +
745 sizeof(struct tcphdr)) {
746 th = (struct tcphdr *)
747 ((caddr_t)ip + (ip->ip_hl << 2));
748 }
749 } else
750 ip = NULL;
751
752 /*
753 * When using dynamic local IP address assignment by using
754 * 0.0.0.0 as a local address, the first TCP session will
755 * not connect because the local TCP checksum is computed
756 * using 0.0.0.0 which will later become our real IP address
757 * so the TCP checksum computed at the remote end will
758 * become invalid. So we
759 * - don't let packets with src ip addr 0 thru
760 * - we flag TCP packets with src ip 0 as an error
761 */
762 if (ip && ip->ip_src.s_addr == INADDR_ANY) {
763 u_int8_t proto = ip->ip_p;
764
765 m_freem(m);
766 splx(s);
767 if (proto == IPPROTO_TCP)
768 return (EADDRNOTAVAIL);
769 else
770 return (0);
771 }
772
773 /*
774 * Put low delay, telnet, rlogin and ftp control packets
775 * in front of the queue.
776 */
777
778 if (!IF_QFULL(&sp->pp_fastq) &&
779 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) ||
780 (th && (INTERACTIVE(ntohs(th->th_sport)) ||
781 INTERACTIVE(ntohs(th->th_dport))))))
782 ifq = &sp->pp_fastq;
783 }
784 #endif
785
786 #ifdef INET6
787 if (dst->sa_family == AF_INET6) {
788 /* XXX do something tricky here? */
789 }
790 #endif
791
792 if ((sp->pp_flags & PP_NOFRAMING) == 0) {
793 /*
794 * Prepend general data packet PPP header. For now, IP only.
795 */
796 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT);
797 if (! m) {
798 if (ifp->if_flags & IFF_DEBUG)
799 log(LOG_DEBUG, "%s: no memory for transmit header\n",
800 ifp->if_xname);
801 ++ifp->if_oerrors;
802 splx(s);
803 return (ENOBUFS);
804 }
805 /*
806 * May want to check size of packet
807 * (albeit due to the implementation it's always enough)
808 */
809 h = mtod(m, struct ppp_header *);
810 if (sp->pp_flags & PP_CISCO) {
811 h->address = CISCO_UNICAST; /* unicast address */
812 h->control = 0;
813 } else {
814 h->address = PPP_ALLSTATIONS; /* broadcast address */
815 h->control = PPP_UI; /* Unnumbered Info */
816 }
817 }
818
819 switch (dst->sa_family) {
820 #ifdef INET
821 case AF_INET: /* Internet Protocol */
822 if (sp->pp_flags & PP_CISCO)
823 protocol = htons(ETHERTYPE_IP);
824 else {
825 /*
826 * Don't choke with an ENETDOWN early. It's
827 * possible that we just started dialing out,
828 * so don't drop the packet immediately. If
829 * we notice that we run out of buffer space
830 * below, we will however remember that we are
831 * not ready to carry IP packets, and return
832 * ENETDOWN, as opposed to ENOBUFS.
833 */
834 protocol = htons(PPP_IP);
835 if (sp->state[IDX_IPCP] != STATE_OPENED)
836 error = ENETDOWN;
837 }
838 break;
839 #endif
840 #ifdef INET6
841 case AF_INET6: /* Internet Protocol version 6 */
842 if (sp->pp_flags & PP_CISCO)
843 protocol = htons(ETHERTYPE_IPV6);
844 else {
845 /*
846 * Don't choke with an ENETDOWN early. It's
847 * possible that we just started dialing out,
848 * so don't drop the packet immediately. If
849 * we notice that we run out of buffer space
850 * below, we will however remember that we are
851 * not ready to carry IP packets, and return
852 * ENETDOWN, as opposed to ENOBUFS.
853 */
854 protocol = htons(PPP_IPV6);
855 if (sp->state[IDX_IPV6CP] != STATE_OPENED)
856 error = ENETDOWN;
857 }
858 break;
859 #endif
860 #ifdef NS
861 case AF_NS: /* Xerox NS Protocol */
862 protocol = htons((sp->pp_flags & PP_CISCO) ?
863 ETHERTYPE_NS : PPP_XNS);
864 break;
865 #endif
866 #ifdef IPX
867 case AF_IPX: /* Novell IPX Protocol */
868 protocol = htons((sp->pp_flags & PP_CISCO) ?
869 ETHERTYPE_IPX : PPP_IPX);
870 break;
871 #endif
872 #ifdef ISO
873 case AF_ISO: /* ISO OSI Protocol */
874 if (sp->pp_flags & PP_CISCO)
875 goto nosupport;
876 protocol = htons(PPP_ISO);
877 break;
878 nosupport:
879 #endif
880 default:
881 m_freem(m);
882 ++ifp->if_oerrors;
883 splx(s);
884 return (EAFNOSUPPORT);
885 }
886
887 if (sp->pp_flags & PP_NOFRAMING) {
888 M_PREPEND(m, 2, M_DONTWAIT);
889 if (m == NULL) {
890 if (ifp->if_flags & IFF_DEBUG)
891 log(LOG_DEBUG, "%s: no memory for transmit header\n",
892 ifp->if_xname);
893 ++ifp->if_oerrors;
894 splx(s);
895 return (ENOBUFS);
896 }
897 *mtod(m, u_int16_t *) = protocol;
898 } else {
899 h->protocol = protocol;
900 }
901
902
903 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr));
904
905 if (error == 0) {
906 /*
907 * Count output packets and bytes.
908 * The packet length includes header + additional hardware
909 * framing according to RFC 1333.
910 */
911 if (!(ifp->if_flags & IFF_OACTIVE))
912 (*ifp->if_start)(ifp);
913 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes;
914 }
915 splx(s);
916 return error;
917 }
918
919 void
920 sppp_attach(struct ifnet *ifp)
921 {
922 struct sppp *sp = (struct sppp *) ifp;
923
924 /* Initialize keepalive handler. */
925 if (! spppq) {
926 callout_init(&keepalive_ch);
927 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL);
928 }
929
930 /* Insert new entry into the keepalive list. */
931 sp->pp_next = spppq;
932 spppq = sp;
933
934 sp->pp_if.if_type = IFT_PPP;
935 sp->pp_if.if_output = sppp_output;
936 sp->pp_fastq.ifq_maxlen = 32;
937 sp->pp_cpq.ifq_maxlen = 20;
938 sp->pp_loopcnt = 0;
939 sp->pp_alivecnt = 0;
940 sp->pp_last_activity = 0;
941 sp->pp_last_receive = 0;
942 sp->pp_maxalive = DEFAULT_MAXALIVECNT;
943 sp->pp_max_noreceive = DEFAULT_NORECV_TIME;
944 sp->pp_idle_timeout = 0;
945 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq));
946 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq));
947 sp->pp_auth_failures = 0;
948 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES;
949 sp->pp_phase = SPPP_PHASE_DEAD;
950 sp->pp_up = lcp.Up;
951 sp->pp_down = lcp.Down;
952
953 if_alloc_sadl(ifp);
954
955 memset(&sp->myauth, 0, sizeof sp->myauth);
956 memset(&sp->hisauth, 0, sizeof sp->hisauth);
957 sppp_lcp_init(sp);
958 sppp_ipcp_init(sp);
959 sppp_ipv6cp_init(sp);
960 sppp_pap_init(sp);
961 sppp_chap_init(sp);
962 }
963
964 void
965 sppp_detach(struct ifnet *ifp)
966 {
967 struct sppp **q, *p, *sp = (struct sppp *) ifp;
968 int i;
969
970 /* Remove the entry from the keepalive list. */
971 for (q = &spppq; (p = *q); q = &p->pp_next)
972 if (p == sp) {
973 *q = p->pp_next;
974 break;
975 }
976
977 /* Stop keepalive handler. */
978 if (! spppq) {
979 callout_stop(&keepalive_ch);
980 }
981
982 for (i = 0; i < IDX_COUNT; i++) {
983 callout_stop(&sp->ch[i]);
984 }
985 callout_stop(&sp->pap_my_to_ch);
986
987 /* free authentication info */
988 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF);
989 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF);
990 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF);
991 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF);
992
993 #if 0 /* done in if_detach() */
994 if_free_sadl(ifp);
995 #endif
996 }
997
998 /*
999 * Flush the interface output queue.
1000 */
1001 void
1002 sppp_flush(struct ifnet *ifp)
1003 {
1004 struct sppp *sp = (struct sppp *) ifp;
1005
1006 IFQ_PURGE(&sp->pp_if.if_snd);
1007 IF_PURGE(&sp->pp_fastq);
1008 IF_PURGE(&sp->pp_cpq);
1009 }
1010
1011 /*
1012 * Check if the output queue is empty.
1013 */
1014 int
1015 sppp_isempty(struct ifnet *ifp)
1016 {
1017 struct sppp *sp = (struct sppp *) ifp;
1018 int empty, s;
1019
1020 s = splnet();
1021 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) &&
1022 IFQ_IS_EMPTY(&sp->pp_if.if_snd);
1023 splx(s);
1024 return (empty);
1025 }
1026
1027 /*
1028 * Get next packet to send.
1029 */
1030 struct mbuf *
1031 sppp_dequeue(struct ifnet *ifp)
1032 {
1033 struct sppp *sp = (struct sppp *) ifp;
1034 struct mbuf *m;
1035 int s;
1036
1037 s = splnet();
1038 /*
1039 * Process only the control protocol queue until we have at
1040 * least one NCP open.
1041 *
1042 * Do always serve all three queues in Cisco mode.
1043 */
1044 IF_DEQUEUE(&sp->pp_cpq, m);
1045 if (m == NULL &&
1046 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) {
1047 IF_DEQUEUE(&sp->pp_fastq, m);
1048 if (m == NULL)
1049 IFQ_DEQUEUE(&sp->pp_if.if_snd, m);
1050 }
1051 splx(s);
1052 return m;
1053 }
1054
1055 /*
1056 * Process an ioctl request. Called on low priority level.
1057 */
1058 int
1059 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data)
1060 {
1061 struct ifreq *ifr = (struct ifreq *) data;
1062 struct sppp *sp = (struct sppp *) ifp;
1063 int s, error=0, going_up, going_down, newmode;
1064
1065 s = splnet();
1066 switch (cmd) {
1067 case SIOCAIFADDR:
1068 case SIOCSIFDSTADDR:
1069 break;
1070
1071 case SIOCSIFADDR:
1072 if_up(ifp);
1073 /* fall through... */
1074
1075 case SIOCSIFFLAGS:
1076 going_up = ifp->if_flags & IFF_UP &&
1077 (ifp->if_flags & IFF_RUNNING) == 0;
1078 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1079 ifp->if_flags & IFF_RUNNING;
1080 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE);
1081 if (newmode == (IFF_AUTO | IFF_PASSIVE)) {
1082 /* sanity */
1083 newmode = IFF_PASSIVE;
1084 ifp->if_flags &= ~IFF_AUTO;
1085 }
1086
1087 if (going_up || going_down)
1088 lcp.Close(sp);
1089 if (going_up && newmode == 0) {
1090 /* neither auto-dial nor passive */
1091 ifp->if_flags |= IFF_RUNNING;
1092 if (!(sp->pp_flags & PP_CISCO))
1093 lcp.Open(sp);
1094 } else if (going_down) {
1095 sppp_flush(ifp);
1096 ifp->if_flags &= ~IFF_RUNNING;
1097 }
1098
1099 break;
1100
1101 #ifdef SIOCSIFMTU
1102 #ifndef ifr_mtu
1103 #define ifr_mtu ifr_metric
1104 #endif
1105 case SIOCSIFMTU:
1106 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) {
1107 error = EINVAL;
1108 break;
1109 }
1110
1111 ifp->if_mtu = ifr->ifr_mtu;
1112 break;
1113 #endif
1114 #ifdef SLIOCSETMTU
1115 case SLIOCSETMTU:
1116 if (*(short *)data < 128 || *(short *)data > sp->lcp.their_mru)
1117 {
1118 error = EINVAL;
1119 break;
1120 }
1121
1122 ifp->if_mtu = *(short *)data;
1123 break;
1124 #endif
1125 #ifdef SIOCGIFMTU
1126 case SIOCGIFMTU:
1127 ifr->ifr_mtu = ifp->if_mtu;
1128 break;
1129 #endif
1130 #ifdef SLIOCGETMTU
1131 case SLIOCGETMTU:
1132 *(short *)data = ifp->if_mtu;
1133 break;
1134 #endif
1135 case SIOCADDMULTI:
1136 case SIOCDELMULTI:
1137 break;
1138
1139 case SPPPSETAUTHCFG:
1140 case SPPPGETAUTHCFG:
1141 case SPPPSETLCPCFG:
1142 case SPPPGETLCPCFG:
1143 case SPPPSETIDLETO:
1144 case SPPPSETAUTHFAILURE:
1145 case SPPPGETAUTHFAILURES:
1146 case SPPPSETDNSOPTS:
1147 case SPPPSETKEEPALIVE:
1148 {
1149 struct proc *p = curproc; /* XXX */
1150
1151 if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0)
1152 break;
1153 }
1154 /* FALLTHROUGH */
1155 case SPPPGETSTATUS:
1156 case SPPPGETSTATUSNCP:
1157 case SPPPGETIDLETO:
1158 case SPPPGETDNSOPTS:
1159 case SPPPGETDNSADDRS:
1160 case SPPPGETKEEPALIVE:
1161 error = sppp_params(sp, cmd, data);
1162 break;
1163
1164 default:
1165 error = ENOTTY;
1166 }
1167 splx(s);
1168 return (error);
1169 }
1170
1171
1172 /*
1173 * Cisco framing implementation.
1174 */
1175
1176 /*
1177 * Handle incoming Cisco keepalive protocol packets.
1178 */
1179 static void
1180 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1181 {
1182 STDDCL;
1183 struct cisco_packet *h;
1184 #ifdef INET
1185 u_int32_t me, mymask = 0; /* XXX: GCC */
1186 #endif
1187
1188 if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1189 if (debug)
1190 log(LOG_DEBUG,
1191 "%s: cisco invalid packet length: %d bytes\n",
1192 ifp->if_xname, m->m_pkthdr.len);
1193 return;
1194 }
1195 h = mtod(m, struct cisco_packet *);
1196 if (debug)
1197 log(LOG_DEBUG,
1198 "%s: cisco input: %d bytes "
1199 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n",
1200 ifp->if_xname, m->m_pkthdr.len,
1201 ntohl(h->type), h->par1, h->par2, (u_int)h->rel,
1202 (u_int)h->time0, (u_int)h->time1);
1203 switch (ntohl(h->type)) {
1204 default:
1205 if (debug)
1206 addlog("%s: cisco unknown packet type: 0x%x\n",
1207 ifp->if_xname, ntohl(h->type));
1208 break;
1209 case CISCO_ADDR_REPLY:
1210 /* Reply on address request, ignore */
1211 break;
1212 case CISCO_KEEPALIVE_REQ:
1213 sp->pp_alivecnt = 0;
1214 sp->pp_rseq[IDX_LCP] = ntohl(h->par1);
1215 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1216 /* Local and remote sequence numbers are equal.
1217 * Probably, the line is in loopback mode. */
1218 if (sp->pp_loopcnt >= LOOPALIVECNT) {
1219 printf ("%s: loopback\n",
1220 ifp->if_xname);
1221 sp->pp_loopcnt = 0;
1222 if (ifp->if_flags & IFF_UP) {
1223 if_down(ifp);
1224 IF_PURGE(&sp->pp_cpq);
1225 }
1226 }
1227 ++sp->pp_loopcnt;
1228
1229 /* Generate new local sequence number */
1230 sp->pp_seq[IDX_LCP] = arc4random();
1231 break;
1232 }
1233 sp->pp_loopcnt = 0;
1234 if (! (ifp->if_flags & IFF_UP) &&
1235 (ifp->if_flags & IFF_RUNNING)) {
1236 if_up(ifp);
1237 }
1238 break;
1239 case CISCO_ADDR_REQ:
1240 #ifdef INET
1241 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1242 if (me != 0L)
1243 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1244 #endif
1245 break;
1246 }
1247 }
1248
1249 /*
1250 * Send Cisco keepalive packet.
1251 */
1252 static void
1253 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2)
1254 {
1255 STDDCL;
1256 struct ppp_header *h;
1257 struct cisco_packet *ch;
1258 struct mbuf *m;
1259 u_int32_t t;
1260
1261 t = time_uptime * 1000;
1262 MGETHDR(m, M_DONTWAIT, MT_DATA);
1263 if (! m)
1264 return;
1265 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1266 m->m_pkthdr.rcvif = 0;
1267
1268 h = mtod(m, struct ppp_header *);
1269 h->address = CISCO_MULTICAST;
1270 h->control = 0;
1271 h->protocol = htons(CISCO_KEEPALIVE);
1272
1273 ch = (struct cisco_packet *)(h + 1);
1274 ch->type = htonl(type);
1275 ch->par1 = htonl(par1);
1276 ch->par2 = htonl(par2);
1277 ch->rel = -1;
1278
1279 ch->time0 = htons((u_short)(t >> 16));
1280 ch->time1 = htons((u_short) t);
1281
1282 if (debug)
1283 log(LOG_DEBUG,
1284 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n",
1285 ifp->if_xname, ntohl(ch->type), ch->par1,
1286 ch->par2, (u_int)ch->rel, (u_int)ch->time0,
1287 (u_int)ch->time1);
1288
1289 if (IF_QFULL(&sp->pp_cpq)) {
1290 IF_DROP(&sp->pp_fastq);
1291 IF_DROP(&ifp->if_snd);
1292 m_freem(m);
1293 ++ifp->if_oerrors;
1294 return;
1295 } else
1296 IF_ENQUEUE(&sp->pp_cpq, m);
1297 if (! (ifp->if_flags & IFF_OACTIVE))
1298 (*ifp->if_start)(ifp);
1299 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes;
1300 }
1301
1302 /*
1303 * PPP protocol implementation.
1304 */
1305
1306 /*
1307 * Send PPP control protocol packet.
1308 */
1309 static void
1310 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1311 u_char ident, u_short len, void *data)
1312 {
1313 STDDCL;
1314 struct lcp_header *lh;
1315 struct mbuf *m;
1316 size_t pkthdrlen;
1317
1318 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN;
1319
1320 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN)
1321 len = MHLEN - pkthdrlen - LCP_HEADER_LEN;
1322 MGETHDR(m, M_DONTWAIT, MT_DATA);
1323 if (! m)
1324 return;
1325 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len;
1326 m->m_pkthdr.rcvif = 0;
1327
1328 if (sp->pp_flags & PP_NOFRAMING) {
1329 *mtod(m, u_int16_t *) = htons(proto);
1330 lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2);
1331 } else {
1332 struct ppp_header *h;
1333 h = mtod(m, struct ppp_header *);
1334 h->address = PPP_ALLSTATIONS; /* broadcast address */
1335 h->control = PPP_UI; /* Unnumbered Info */
1336 h->protocol = htons(proto); /* Link Control Protocol */
1337 lh = (struct lcp_header *)(h + 1);
1338 }
1339 lh->type = type;
1340 lh->ident = ident;
1341 lh->len = htons(LCP_HEADER_LEN + len);
1342 if (len)
1343 bcopy (data, lh + 1, len);
1344
1345 if (debug) {
1346 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d",
1347 ifp->if_xname,
1348 sppp_proto_name(proto),
1349 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len));
1350 if (len)
1351 sppp_print_bytes((u_char *)(lh + 1), len);
1352 addlog(">\n");
1353 }
1354 if (IF_QFULL(&sp->pp_cpq)) {
1355 IF_DROP(&sp->pp_fastq);
1356 IF_DROP(&ifp->if_snd);
1357 m_freem(m);
1358 ++ifp->if_oerrors;
1359 return;
1360 } else
1361 IF_ENQUEUE(&sp->pp_cpq, m);
1362 if (! (ifp->if_flags & IFF_OACTIVE))
1363 (*ifp->if_start)(ifp);
1364 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes;
1365 }
1366
1367 /*
1368 * Handle incoming PPP control protocol packets.
1369 */
1370 static void
1371 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1372 {
1373 STDDCL;
1374 struct lcp_header *h;
1375 int len = m->m_pkthdr.len;
1376 int rv;
1377 u_char *p;
1378 u_int32_t u32;
1379
1380 if (len < 4) {
1381 if (debug)
1382 log(LOG_DEBUG,
1383 "%s: %s invalid packet length: %d bytes\n",
1384 ifp->if_xname, cp->name, len);
1385 return;
1386 }
1387 h = mtod(m, struct lcp_header *);
1388 if (debug) {
1389 log(LOG_DEBUG,
1390 "%s: %s input(%s): <%s id=0x%x len=%d",
1391 ifp->if_xname, cp->name,
1392 sppp_state_name(sp->state[cp->protoidx]),
1393 sppp_cp_type_name(h->type), h->ident, ntohs(h->len));
1394 if (len > 4)
1395 sppp_print_bytes((u_char *)(h + 1), len - 4);
1396 addlog(">\n");
1397 }
1398 if (len > ntohs(h->len))
1399 len = ntohs(h->len);
1400 p = (u_char *)(h + 1);
1401 switch (h->type) {
1402 case CONF_REQ:
1403 if (len < 4) {
1404 if (debug)
1405 addlog("%s: %s invalid conf-req length %d\n",
1406 ifp->if_xname, cp->name,
1407 len);
1408 ++ifp->if_ierrors;
1409 break;
1410 }
1411 /* handle states where RCR doesn't get a SCA/SCN */
1412 switch (sp->state[cp->protoidx]) {
1413 case STATE_CLOSING:
1414 case STATE_STOPPING:
1415 return;
1416 case STATE_CLOSED:
1417 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1418 0, 0);
1419 return;
1420 }
1421 rv = (cp->RCR)(sp, h, len);
1422 switch (sp->state[cp->protoidx]) {
1423 case STATE_OPENED:
1424 (cp->tld)(sp);
1425 (cp->scr)(sp);
1426 /* fall through... */
1427 case STATE_ACK_SENT:
1428 case STATE_REQ_SENT:
1429 sppp_cp_change_state(cp, sp, rv?
1430 STATE_ACK_SENT: STATE_REQ_SENT);
1431 break;
1432 case STATE_STOPPED:
1433 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1434 (cp->scr)(sp);
1435 sppp_cp_change_state(cp, sp, rv?
1436 STATE_ACK_SENT: STATE_REQ_SENT);
1437 break;
1438 case STATE_ACK_RCVD:
1439 if (rv) {
1440 sppp_cp_change_state(cp, sp, STATE_OPENED);
1441 if (debug)
1442 log(LOG_DEBUG, "%s: %s tlu\n",
1443 ifp->if_xname,
1444 cp->name);
1445 (cp->tlu)(sp);
1446 } else
1447 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1448 break;
1449 default:
1450 printf("%s: %s illegal %s in state %s\n",
1451 ifp->if_xname, cp->name,
1452 sppp_cp_type_name(h->type),
1453 sppp_state_name(sp->state[cp->protoidx]));
1454 ++ifp->if_ierrors;
1455 }
1456 break;
1457 case CONF_ACK:
1458 if (h->ident != sp->confid[cp->protoidx]) {
1459 if (debug)
1460 addlog("%s: %s id mismatch 0x%x != 0x%x\n",
1461 ifp->if_xname, cp->name,
1462 h->ident, sp->confid[cp->protoidx]);
1463 ++ifp->if_ierrors;
1464 break;
1465 }
1466 switch (sp->state[cp->protoidx]) {
1467 case STATE_CLOSED:
1468 case STATE_STOPPED:
1469 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1470 break;
1471 case STATE_CLOSING:
1472 case STATE_STOPPING:
1473 break;
1474 case STATE_REQ_SENT:
1475 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1476 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1477 break;
1478 case STATE_OPENED:
1479 (cp->tld)(sp);
1480 /* fall through */
1481 case STATE_ACK_RCVD:
1482 (cp->scr)(sp);
1483 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1484 break;
1485 case STATE_ACK_SENT:
1486 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1487 sppp_cp_change_state(cp, sp, STATE_OPENED);
1488 if (debug)
1489 log(LOG_DEBUG, "%s: %s tlu\n",
1490 ifp->if_xname, cp->name);
1491 (cp->tlu)(sp);
1492 break;
1493 default:
1494 printf("%s: %s illegal %s in state %s\n",
1495 ifp->if_xname, cp->name,
1496 sppp_cp_type_name(h->type),
1497 sppp_state_name(sp->state[cp->protoidx]));
1498 ++ifp->if_ierrors;
1499 }
1500 break;
1501 case CONF_NAK:
1502 case CONF_REJ:
1503 if (h->ident != sp->confid[cp->protoidx]) {
1504 if (debug)
1505 addlog("%s: %s id mismatch 0x%x != 0x%x\n",
1506 ifp->if_xname, cp->name,
1507 h->ident, sp->confid[cp->protoidx]);
1508 ++ifp->if_ierrors;
1509 break;
1510 }
1511 if (h->type == CONF_NAK)
1512 (cp->RCN_nak)(sp, h, len);
1513 else /* CONF_REJ */
1514 (cp->RCN_rej)(sp, h, len);
1515
1516 switch (sp->state[cp->protoidx]) {
1517 case STATE_CLOSED:
1518 case STATE_STOPPED:
1519 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1520 break;
1521 case STATE_REQ_SENT:
1522 case STATE_ACK_SENT:
1523 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1524 (cp->scr)(sp);
1525 break;
1526 case STATE_OPENED:
1527 (cp->tld)(sp);
1528 /* fall through */
1529 case STATE_ACK_RCVD:
1530 sppp_cp_change_state(cp, sp, STATE_ACK_SENT);
1531 (cp->scr)(sp);
1532 break;
1533 case STATE_CLOSING:
1534 case STATE_STOPPING:
1535 break;
1536 default:
1537 printf("%s: %s illegal %s in state %s\n",
1538 ifp->if_xname, cp->name,
1539 sppp_cp_type_name(h->type),
1540 sppp_state_name(sp->state[cp->protoidx]));
1541 ++ifp->if_ierrors;
1542 }
1543 break;
1544
1545 case TERM_REQ:
1546 switch (sp->state[cp->protoidx]) {
1547 case STATE_ACK_RCVD:
1548 case STATE_ACK_SENT:
1549 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1550 /* fall through */
1551 case STATE_CLOSED:
1552 case STATE_STOPPED:
1553 case STATE_CLOSING:
1554 case STATE_STOPPING:
1555 case STATE_REQ_SENT:
1556 sta:
1557 /* Send Terminate-Ack packet. */
1558 if (debug)
1559 log(LOG_DEBUG, "%s: %s send terminate-ack\n",
1560 ifp->if_xname, cp->name);
1561 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1562 break;
1563 case STATE_OPENED:
1564 (cp->tld)(sp);
1565 sp->rst_counter[cp->protoidx] = 0;
1566 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1567 goto sta;
1568 default:
1569 printf("%s: %s illegal %s in state %s\n",
1570 ifp->if_xname, cp->name,
1571 sppp_cp_type_name(h->type),
1572 sppp_state_name(sp->state[cp->protoidx]));
1573 ++ifp->if_ierrors;
1574 }
1575 break;
1576 case TERM_ACK:
1577 switch (sp->state[cp->protoidx]) {
1578 case STATE_CLOSED:
1579 case STATE_STOPPED:
1580 case STATE_REQ_SENT:
1581 case STATE_ACK_SENT:
1582 break;
1583 case STATE_CLOSING:
1584 (cp->tlf)(sp);
1585 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1586 sppp_lcp_check_and_close(sp);
1587 break;
1588 case STATE_STOPPING:
1589 (cp->tlf)(sp);
1590 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1591 sppp_lcp_check_and_close(sp);
1592 break;
1593 case STATE_ACK_RCVD:
1594 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1595 break;
1596 case STATE_OPENED:
1597 (cp->tld)(sp);
1598 (cp->scr)(sp);
1599 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1600 break;
1601 default:
1602 printf("%s: %s illegal %s in state %s\n",
1603 ifp->if_xname, cp->name,
1604 sppp_cp_type_name(h->type),
1605 sppp_state_name(sp->state[cp->protoidx]));
1606 ++ifp->if_ierrors;
1607 }
1608 break;
1609 case CODE_REJ:
1610 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1611 log(LOG_INFO,
1612 "%s: %s: ignoring RXJ (%s) for code ?, "
1613 "danger will robinson\n",
1614 ifp->if_xname, cp->name,
1615 sppp_cp_type_name(h->type));
1616 switch (sp->state[cp->protoidx]) {
1617 case STATE_CLOSED:
1618 case STATE_STOPPED:
1619 case STATE_REQ_SENT:
1620 case STATE_ACK_SENT:
1621 case STATE_CLOSING:
1622 case STATE_STOPPING:
1623 case STATE_OPENED:
1624 break;
1625 case STATE_ACK_RCVD:
1626 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1627 break;
1628 default:
1629 printf("%s: %s illegal %s in state %s\n",
1630 ifp->if_xname, cp->name,
1631 sppp_cp_type_name(h->type),
1632 sppp_state_name(sp->state[cp->protoidx]));
1633 ++ifp->if_ierrors;
1634 }
1635 break;
1636 case PROTO_REJ:
1637 {
1638 int catastrophic;
1639 const struct cp *upper;
1640 int i;
1641 u_int16_t proto;
1642
1643 catastrophic = 0;
1644 upper = NULL;
1645 proto = p[0] << 8 | p[1];
1646 for (i = 0; i < IDX_COUNT; i++) {
1647 if (cps[i]->proto == proto) {
1648 upper = cps[i];
1649 break;
1650 }
1651 }
1652 if (upper == NULL)
1653 catastrophic++;
1654
1655 if (debug)
1656 log(LOG_INFO,
1657 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1658 ifp->if_xname, cp->name, catastrophic ? '-' : '+',
1659 sppp_cp_type_name(h->type), proto,
1660 upper ? upper->name : "unknown",
1661 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1662
1663 /*
1664 * if we got RXJ+ against conf-req, the peer does not implement
1665 * this particular protocol type. terminate the protocol.
1666 */
1667 if (upper && !catastrophic) {
1668 if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1669 upper->Close(sp);
1670 break;
1671 }
1672 }
1673
1674 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1675 switch (sp->state[cp->protoidx]) {
1676 case STATE_CLOSED:
1677 case STATE_STOPPED:
1678 case STATE_REQ_SENT:
1679 case STATE_ACK_SENT:
1680 case STATE_CLOSING:
1681 case STATE_STOPPING:
1682 case STATE_OPENED:
1683 break;
1684 case STATE_ACK_RCVD:
1685 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1686 break;
1687 default:
1688 printf("%s: %s illegal %s in state %s\n",
1689 ifp->if_xname, cp->name,
1690 sppp_cp_type_name(h->type),
1691 sppp_state_name(sp->state[cp->protoidx]));
1692 ++ifp->if_ierrors;
1693 }
1694 break;
1695 }
1696 case DISC_REQ:
1697 if (cp->proto != PPP_LCP)
1698 goto illegal;
1699 /* Discard the packet. */
1700 break;
1701 case ECHO_REQ:
1702 if (cp->proto != PPP_LCP)
1703 goto illegal;
1704 if (sp->state[cp->protoidx] != STATE_OPENED) {
1705 if (debug)
1706 addlog("%s: lcp echo req but lcp closed\n",
1707 ifp->if_xname);
1708 ++ifp->if_ierrors;
1709 break;
1710 }
1711 if (len < 8) {
1712 if (debug)
1713 addlog("%s: invalid lcp echo request "
1714 "packet length: %d bytes\n",
1715 ifp->if_xname, len);
1716 break;
1717 }
1718 memcpy(&u32, h + 1, sizeof u32);
1719 if (ntohl(u32) == sp->lcp.magic) {
1720 /* Line loopback mode detected. */
1721 printf("%s: loopback\n", ifp->if_xname);
1722 if_down(ifp);
1723 IF_PURGE(&sp->pp_cpq);
1724
1725 /* Shut down the PPP link. */
1726 /* XXX */
1727 lcp.Down(sp);
1728 lcp.Up(sp);
1729 break;
1730 }
1731 u32 = htonl(sp->lcp.magic);
1732 memcpy(h + 1, &u32, sizeof u32);
1733 if (debug)
1734 addlog("%s: got lcp echo req, sending echo rep\n",
1735 ifp->if_xname);
1736 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4,
1737 h + 1);
1738 break;
1739 case ECHO_REPLY:
1740 if (cp->proto != PPP_LCP)
1741 goto illegal;
1742 if (h->ident != sp->lcp.echoid) {
1743 ++ifp->if_ierrors;
1744 break;
1745 }
1746 if (len < 8) {
1747 if (debug)
1748 addlog("%s: lcp invalid echo reply "
1749 "packet length: %d bytes\n",
1750 ifp->if_xname, len);
1751 break;
1752 }
1753 if (debug)
1754 addlog("%s: lcp got echo rep\n",
1755 ifp->if_xname);
1756 memcpy(&u32, h + 1, sizeof u32);
1757 if (ntohl(u32) != sp->lcp.magic)
1758 sp->pp_alivecnt = 0;
1759 break;
1760 default:
1761 /* Unknown packet type -- send Code-Reject packet. */
1762 illegal:
1763 if (debug)
1764 addlog("%s: %s send code-rej for 0x%x\n",
1765 ifp->if_xname, cp->name, h->type);
1766 sppp_cp_send(sp, cp->proto, CODE_REJ,
1767 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1768 ++ifp->if_ierrors;
1769 }
1770 }
1771
1772
1773 /*
1774 * The generic part of all Up/Down/Open/Close/TO event handlers.
1775 * Basically, the state transition handling in the automaton.
1776 */
1777 static void
1778 sppp_up_event(const struct cp *cp, struct sppp *sp)
1779 {
1780 STDDCL;
1781
1782 if (debug)
1783 log(LOG_DEBUG, "%s: %s up(%s)\n",
1784 ifp->if_xname, cp->name,
1785 sppp_state_name(sp->state[cp->protoidx]));
1786
1787 switch (sp->state[cp->protoidx]) {
1788 case STATE_INITIAL:
1789 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1790 break;
1791 case STATE_STARTING:
1792 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1793 (cp->scr)(sp);
1794 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1795 break;
1796 default:
1797 printf("%s: %s illegal up in state %s\n",
1798 ifp->if_xname, cp->name,
1799 sppp_state_name(sp->state[cp->protoidx]));
1800 }
1801 }
1802
1803 static void
1804 sppp_down_event(const struct cp *cp, struct sppp *sp)
1805 {
1806 STDDCL;
1807
1808 if (debug)
1809 log(LOG_DEBUG, "%s: %s down(%s)\n",
1810 ifp->if_xname, cp->name,
1811 sppp_state_name(sp->state[cp->protoidx]));
1812
1813 switch (sp->state[cp->protoidx]) {
1814 case STATE_CLOSED:
1815 case STATE_CLOSING:
1816 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1817 break;
1818 case STATE_STOPPED:
1819 (cp->tls)(sp);
1820 /* fall through */
1821 case STATE_STOPPING:
1822 case STATE_REQ_SENT:
1823 case STATE_ACK_RCVD:
1824 case STATE_ACK_SENT:
1825 sppp_cp_change_state(cp, sp, STATE_STARTING);
1826 break;
1827 case STATE_OPENED:
1828 (cp->tld)(sp);
1829 sppp_cp_change_state(cp, sp, STATE_STARTING);
1830 break;
1831 default:
1832 printf("%s: %s illegal down in state %s\n",
1833 ifp->if_xname, cp->name,
1834 sppp_state_name(sp->state[cp->protoidx]));
1835 }
1836 }
1837
1838
1839 static void
1840 sppp_open_event(const struct cp *cp, struct sppp *sp)
1841 {
1842 STDDCL;
1843
1844 if (debug)
1845 log(LOG_DEBUG, "%s: %s open(%s)\n",
1846 ifp->if_xname, cp->name,
1847 sppp_state_name(sp->state[cp->protoidx]));
1848
1849 switch (sp->state[cp->protoidx]) {
1850 case STATE_INITIAL:
1851 sppp_cp_change_state(cp, sp, STATE_STARTING);
1852 (cp->tls)(sp);
1853 break;
1854 case STATE_STARTING:
1855 break;
1856 case STATE_CLOSED:
1857 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1858 (cp->scr)(sp);
1859 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1860 break;
1861 case STATE_STOPPED:
1862 case STATE_STOPPING:
1863 case STATE_REQ_SENT:
1864 case STATE_ACK_RCVD:
1865 case STATE_ACK_SENT:
1866 case STATE_OPENED:
1867 break;
1868 case STATE_CLOSING:
1869 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1870 break;
1871 }
1872 }
1873
1874
1875 static void
1876 sppp_close_event(const struct cp *cp, struct sppp *sp)
1877 {
1878 STDDCL;
1879
1880 if (debug)
1881 log(LOG_DEBUG, "%s: %s close(%s)\n",
1882 ifp->if_xname, cp->name,
1883 sppp_state_name(sp->state[cp->protoidx]));
1884
1885 switch (sp->state[cp->protoidx]) {
1886 case STATE_INITIAL:
1887 case STATE_CLOSED:
1888 case STATE_CLOSING:
1889 break;
1890 case STATE_STARTING:
1891 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1892 (cp->tlf)(sp);
1893 break;
1894 case STATE_STOPPED:
1895 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1896 break;
1897 case STATE_STOPPING:
1898 sppp_cp_change_state(cp, sp, STATE_CLOSING);
1899 break;
1900 case STATE_OPENED:
1901 (cp->tld)(sp);
1902 /* fall through */
1903 case STATE_REQ_SENT:
1904 case STATE_ACK_RCVD:
1905 case STATE_ACK_SENT:
1906 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
1907 sppp_cp_send(sp, cp->proto, TERM_REQ,
1908 ++sp->pp_seq[cp->protoidx], 0, 0);
1909 sppp_cp_change_state(cp, sp, STATE_CLOSING);
1910 break;
1911 }
1912 }
1913
1914 static void
1915 sppp_to_event(const struct cp *cp, struct sppp *sp)
1916 {
1917 STDDCL;
1918 int s;
1919
1920 s = splnet();
1921 if (debug)
1922 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n",
1923 ifp->if_xname, cp->name,
1924 sppp_state_name(sp->state[cp->protoidx]),
1925 sp->rst_counter[cp->protoidx]);
1926
1927 if (--sp->rst_counter[cp->protoidx] < 0)
1928 /* TO- event */
1929 switch (sp->state[cp->protoidx]) {
1930 case STATE_CLOSING:
1931 (cp->tlf)(sp);
1932 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1933 sppp_lcp_check_and_close(sp);
1934 break;
1935 case STATE_STOPPING:
1936 (cp->tlf)(sp);
1937 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1938 sppp_lcp_check_and_close(sp);
1939 break;
1940 case STATE_REQ_SENT:
1941 case STATE_ACK_RCVD:
1942 case STATE_ACK_SENT:
1943 (cp->tlf)(sp);
1944 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1945 sppp_lcp_check_and_close(sp);
1946 break;
1947 }
1948 else
1949 /* TO+ event */
1950 switch (sp->state[cp->protoidx]) {
1951 case STATE_CLOSING:
1952 case STATE_STOPPING:
1953 sppp_cp_send(sp, cp->proto, TERM_REQ,
1954 ++sp->pp_seq[cp->protoidx], 0, 0);
1955 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
1956 cp->TO, sp);
1957 break;
1958 case STATE_REQ_SENT:
1959 case STATE_ACK_RCVD:
1960 (cp->scr)(sp);
1961 /* sppp_cp_change_state() will restart the timer */
1962 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1963 break;
1964 case STATE_ACK_SENT:
1965 (cp->scr)(sp);
1966 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
1967 cp->TO, sp);
1968 break;
1969 }
1970
1971 splx(s);
1972 }
1973
1974 /*
1975 * Change the state of a control protocol in the state automaton.
1976 * Takes care of starting/stopping the restart timer.
1977 */
1978 void
1979 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
1980 {
1981 sp->state[cp->protoidx] = newstate;
1982 callout_stop(&sp->ch[cp->protoidx]);
1983 switch (newstate) {
1984 case STATE_INITIAL:
1985 case STATE_STARTING:
1986 case STATE_CLOSED:
1987 case STATE_STOPPED:
1988 case STATE_OPENED:
1989 break;
1990 case STATE_CLOSING:
1991 case STATE_STOPPING:
1992 case STATE_REQ_SENT:
1993 case STATE_ACK_RCVD:
1994 case STATE_ACK_SENT:
1995 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
1996 cp->TO, sp);
1997 break;
1998 }
1999 }
2000
2001 /*
2002 *--------------------------------------------------------------------------*
2003 * *
2004 * The LCP implementation. *
2005 * *
2006 *--------------------------------------------------------------------------*
2007 */
2008 static void
2009 sppp_lcp_init(struct sppp *sp)
2010 {
2011 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2012 sp->lcp.magic = 0;
2013 sp->state[IDX_LCP] = STATE_INITIAL;
2014 sp->fail_counter[IDX_LCP] = 0;
2015 sp->pp_seq[IDX_LCP] = 0;
2016 sp->pp_rseq[IDX_LCP] = 0;
2017 sp->lcp.protos = 0;
2018 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2019
2020 /*
2021 * Initialize counters and timeout values. Note that we don't
2022 * use the 3 seconds suggested in RFC 1661 since we are likely
2023 * running on a fast link. XXX We should probably implement
2024 * the exponential backoff option. Note that these values are
2025 * relevant for all control protocols, not just LCP only.
2026 */
2027 sp->lcp.timeout = 1 * hz;
2028 sp->lcp.max_terminate = 2;
2029 sp->lcp.max_configure = 10;
2030 sp->lcp.max_failure = 10;
2031 callout_init(&sp->ch[IDX_LCP]);
2032 }
2033
2034 static void
2035 sppp_lcp_up(struct sppp *sp)
2036 {
2037 STDDCL;
2038
2039 /* Initialize activity timestamp: opening a connection is an activity */
2040 sp->pp_last_receive = sp->pp_last_activity = time_uptime;
2041
2042 /*
2043 * If this interface is passive or dial-on-demand, and we are
2044 * still in Initial state, it means we've got an incoming
2045 * call. Activate the interface.
2046 */
2047 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2048 if (debug)
2049 log(LOG_DEBUG,
2050 "%s: Up event", ifp->if_xname);
2051 ifp->if_flags |= IFF_RUNNING;
2052 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2053 if (debug)
2054 addlog("(incoming call)\n");
2055 sp->pp_flags |= PP_CALLIN;
2056 lcp.Open(sp);
2057 } else if (debug)
2058 addlog("\n");
2059 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2060 (sp->state[IDX_LCP] == STATE_INITIAL)) {
2061 ifp->if_flags |= IFF_RUNNING;
2062 lcp.Open(sp);
2063 }
2064
2065 sppp_up_event(&lcp, sp);
2066 }
2067
2068 static void
2069 sppp_lcp_down(struct sppp *sp)
2070 {
2071 STDDCL;
2072
2073 sppp_down_event(&lcp, sp);
2074
2075 /*
2076 * If this is neither a dial-on-demand nor a passive
2077 * interface, simulate an ``ifconfig down'' action, so the
2078 * administrator can force a redial by another ``ifconfig
2079 * up''. XXX For leased line operation, should we immediately
2080 * try to reopen the connection here?
2081 */
2082 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2083 if (debug)
2084 log(LOG_INFO,
2085 "%s: Down event (carrier loss), taking interface down.\n",
2086 ifp->if_xname);
2087 if_down(ifp);
2088 } else {
2089 if (debug)
2090 log(LOG_DEBUG,
2091 "%s: Down event (carrier loss)\n",
2092 ifp->if_xname);
2093 }
2094 sp->pp_flags &= ~PP_CALLIN;
2095 if (sp->state[IDX_LCP] != STATE_INITIAL)
2096 lcp.Close(sp);
2097 ifp->if_flags &= ~IFF_RUNNING;
2098 }
2099
2100 static void
2101 sppp_lcp_open(struct sppp *sp)
2102 {
2103 /*
2104 * If we are authenticator, negotiate LCP_AUTH
2105 */
2106 if (sp->hisauth.proto != 0)
2107 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2108 else
2109 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2110 sp->pp_flags &= ~PP_NEEDAUTH;
2111 sppp_open_event(&lcp, sp);
2112 }
2113
2114 static void
2115 sppp_lcp_close(struct sppp *sp)
2116 {
2117 sppp_close_event(&lcp, sp);
2118 }
2119
2120 static void
2121 sppp_lcp_TO(void *cookie)
2122 {
2123 sppp_to_event(&lcp, (struct sppp *)cookie);
2124 }
2125
2126 /*
2127 * Analyze a configure request. Return true if it was agreeable, and
2128 * caused action sca, false if it has been rejected or nak'ed, and
2129 * caused action scn. (The return value is used to make the state
2130 * transition decision in the state automaton.)
2131 */
2132 static int
2133 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2134 {
2135 STDDCL;
2136 u_char *buf, *r, *p;
2137 int origlen, rlen;
2138 u_int32_t nmagic;
2139 u_short authproto;
2140
2141 len -= 4;
2142 origlen = len;
2143 buf = r = malloc (len, M_TEMP, M_NOWAIT);
2144 if (! buf)
2145 return (0);
2146
2147 if (debug)
2148 log(LOG_DEBUG, "%s: lcp parse opts:",
2149 ifp->if_xname);
2150
2151 /* pass 1: check for things that need to be rejected */
2152 p = (void *)(h + 1);
2153 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2154 if (debug)
2155 addlog(" %s", sppp_lcp_opt_name(*p));
2156 switch (*p) {
2157 case LCP_OPT_MAGIC:
2158 /* Magic number. */
2159 /* fall through, both are same length */
2160 case LCP_OPT_ASYNC_MAP:
2161 /* Async control character map. */
2162 if (len >= 6 || p[1] == 6)
2163 continue;
2164 if (debug)
2165 addlog(" [invalid]");
2166 break;
2167 case LCP_OPT_MRU:
2168 /* Maximum receive unit. */
2169 if (len >= 4 && p[1] == 4)
2170 continue;
2171 if (debug)
2172 addlog(" [invalid]");
2173 break;
2174 case LCP_OPT_AUTH_PROTO:
2175 if (len < 4) {
2176 if (debug)
2177 addlog(" [invalid]");
2178 break;
2179 }
2180 authproto = (p[2] << 8) + p[3];
2181 if (authproto == PPP_CHAP && p[1] != 5) {
2182 if (debug)
2183 addlog(" [invalid chap len]");
2184 break;
2185 }
2186 if (sp->myauth.proto == 0) {
2187 /* we are not configured to do auth */
2188 if (debug)
2189 addlog(" [not configured]");
2190 break;
2191 }
2192 /*
2193 * Remote want us to authenticate, remember this,
2194 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got
2195 * up.
2196 */
2197 sp->pp_flags |= PP_NEEDAUTH;
2198 continue;
2199 default:
2200 /* Others not supported. */
2201 if (debug)
2202 addlog(" [rej]");
2203 break;
2204 }
2205 /* Add the option to rejected list. */
2206 bcopy (p, r, p[1]);
2207 r += p[1];
2208 rlen += p[1];
2209 }
2210 if (rlen) {
2211 if (debug)
2212 addlog(" send conf-rej\n");
2213 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2214 goto end;
2215 } else if (debug)
2216 addlog("\n");
2217
2218 /*
2219 * pass 2: check for option values that are unacceptable and
2220 * thus require to be nak'ed.
2221 */
2222 if (debug)
2223 log(LOG_DEBUG, "%s: lcp parse opt values: ",
2224 ifp->if_xname);
2225
2226 p = (void *)(h + 1);
2227 len = origlen;
2228 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2229 if (debug)
2230 addlog(" %s", sppp_lcp_opt_name(*p));
2231 switch (*p) {
2232 case LCP_OPT_MAGIC:
2233 /* Magic number -- extract. */
2234 nmagic = (u_int32_t)p[2] << 24 |
2235 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5];
2236 if (nmagic != sp->lcp.magic) {
2237 if (debug)
2238 addlog(" 0x%x", nmagic);
2239 continue;
2240 }
2241 /*
2242 * Local and remote magics equal -- loopback?
2243 */
2244 if (sp->pp_loopcnt >= LOOPALIVECNT*5) {
2245 printf ("%s: loopback\n",
2246 ifp->if_xname);
2247 sp->pp_loopcnt = 0;
2248 if (ifp->if_flags & IFF_UP) {
2249 if_down(ifp);
2250 IF_PURGE(&sp->pp_cpq);
2251 /* XXX ? */
2252 lcp.Down(sp);
2253 lcp.Up(sp);
2254 }
2255 } else if (debug)
2256 addlog(" [glitch]");
2257 ++sp->pp_loopcnt;
2258 /*
2259 * We negate our magic here, and NAK it. If
2260 * we see it later in an NAK packet, we
2261 * suggest a new one.
2262 */
2263 nmagic = ~sp->lcp.magic;
2264 /* Gonna NAK it. */
2265 p[2] = nmagic >> 24;
2266 p[3] = nmagic >> 16;
2267 p[4] = nmagic >> 8;
2268 p[5] = nmagic;
2269 break;
2270
2271 case LCP_OPT_ASYNC_MAP:
2272 /*
2273 * Async control character map -- just ignore it.
2274 *
2275 * Quote from RFC 1662, chapter 6:
2276 * To enable this functionality, synchronous PPP
2277 * implementations MUST always respond to the
2278 * Async-Control-Character-Map Configuration
2279 * Option with the LCP Configure-Ack. However,
2280 * acceptance of the Configuration Option does
2281 * not imply that the synchronous implementation
2282 * will do any ACCM mapping. Instead, all such
2283 * octet mapping will be performed by the
2284 * asynchronous-to-synchronous converter.
2285 */
2286 continue;
2287
2288 case LCP_OPT_MRU:
2289 /*
2290 * Maximum receive unit. Always agreeable,
2291 * but ignored by now.
2292 */
2293 sp->lcp.their_mru = p[2] * 256 + p[3];
2294 if (debug)
2295 addlog(" %ld", sp->lcp.their_mru);
2296 continue;
2297
2298 case LCP_OPT_AUTH_PROTO:
2299 authproto = (p[2] << 8) + p[3];
2300 if (sp->myauth.proto != authproto) {
2301 /* not agreed, nak */
2302 if (debug)
2303 addlog(" [mine %s != his %s]",
2304 sppp_proto_name(sp->myauth.proto),
2305 sppp_proto_name(authproto));
2306 p[2] = sp->myauth.proto >> 8;
2307 p[3] = sp->myauth.proto;
2308 break;
2309 }
2310 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2311 if (debug)
2312 addlog(" [chap not MD5]");
2313 p[4] = CHAP_MD5;
2314 break;
2315 }
2316 continue;
2317 }
2318 /* Add the option to nak'ed list. */
2319 bcopy (p, r, p[1]);
2320 r += p[1];
2321 rlen += p[1];
2322 }
2323 if (rlen) {
2324 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2325 if (debug)
2326 addlog(" max_failure (%d) exceeded, "
2327 "send conf-rej\n",
2328 sp->lcp.max_failure);
2329 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2330 } else {
2331 if (debug)
2332 addlog(" send conf-nak\n");
2333 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2334 }
2335 goto end;
2336 } else {
2337 if (debug)
2338 addlog(" send conf-ack\n");
2339 sp->fail_counter[IDX_LCP] = 0;
2340 sp->pp_loopcnt = 0;
2341 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1);
2342 }
2343
2344 end:
2345 free(buf, M_TEMP);
2346 return (rlen == 0);
2347 }
2348
2349 /*
2350 * Analyze the LCP Configure-Reject option list, and adjust our
2351 * negotiation.
2352 */
2353 static void
2354 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2355 {
2356 STDDCL;
2357 u_char *buf, *p;
2358
2359 len -= 4;
2360 buf = malloc (len, M_TEMP, M_NOWAIT);
2361 if (!buf)
2362 return;
2363
2364 if (debug)
2365 log(LOG_DEBUG, "%s: lcp rej opts:",
2366 ifp->if_xname);
2367
2368 p = (void *)(h + 1);
2369 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2370 if (debug)
2371 addlog(" %s", sppp_lcp_opt_name(*p));
2372 switch (*p) {
2373 case LCP_OPT_MAGIC:
2374 /* Magic number -- can't use it, use 0 */
2375 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2376 sp->lcp.magic = 0;
2377 break;
2378 case LCP_OPT_MRU:
2379 /*
2380 * Should not be rejected anyway, since we only
2381 * negotiate a MRU if explicitly requested by
2382 * peer.
2383 */
2384 sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2385 break;
2386 case LCP_OPT_AUTH_PROTO:
2387 /*
2388 * Peer doesn't want to authenticate himself,
2389 * deny unless this is a dialout call, and
2390 * SPPP_AUTHFLAG_NOCALLOUT is set.
2391 */
2392 if ((sp->pp_flags & PP_CALLIN) == 0 &&
2393 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) {
2394 if (debug)
2395 addlog(" [don't insist on auth "
2396 "for callout]");
2397 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2398 break;
2399 }
2400 if (debug)
2401 addlog("[access denied]\n");
2402 lcp.Close(sp);
2403 break;
2404 }
2405 }
2406 if (debug)
2407 addlog("\n");
2408 free(buf, M_TEMP);
2409 return;
2410 }
2411
2412 /*
2413 * Analyze the LCP Configure-NAK option list, and adjust our
2414 * negotiation.
2415 */
2416 static void
2417 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2418 {
2419 STDDCL;
2420 u_char *buf, *p;
2421 u_int32_t magic;
2422
2423 len -= 4;
2424 buf = malloc (len, M_TEMP, M_NOWAIT);
2425 if (!buf)
2426 return;
2427
2428 if (debug)
2429 log(LOG_DEBUG, "%s: lcp nak opts:",
2430 ifp->if_xname);
2431
2432 p = (void *)(h + 1);
2433 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2434 if (debug)
2435 addlog(" %s", sppp_lcp_opt_name(*p));
2436 switch (*p) {
2437 case LCP_OPT_MAGIC:
2438 /* Magic number -- renegotiate */
2439 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2440 len >= 6 && p[1] == 6) {
2441 magic = (u_int32_t)p[2] << 24 |
2442 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5];
2443 /*
2444 * If the remote magic is our negated one,
2445 * this looks like a loopback problem.
2446 * Suggest a new magic to make sure.
2447 */
2448 if (magic == ~sp->lcp.magic) {
2449 if (debug)
2450 addlog(" magic glitch");
2451 sp->lcp.magic = arc4random();
2452 } else {
2453 sp->lcp.magic = magic;
2454 if (debug)
2455 addlog(" %d", magic);
2456 }
2457 }
2458 break;
2459 case LCP_OPT_MRU:
2460 /*
2461 * Peer wants to advise us to negotiate an MRU.
2462 * Agree on it if it's reasonable, or use
2463 * default otherwise.
2464 */
2465 if (len >= 4 && p[1] == 4) {
2466 u_int mru = p[2] * 256 + p[3];
2467 if (debug)
2468 addlog(" %d", mru);
2469 if (mru < PP_MTU || mru > PP_MAX_MRU)
2470 mru = PP_MTU;
2471 sp->lcp.mru = mru;
2472 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2473 }
2474 break;
2475 case LCP_OPT_AUTH_PROTO:
2476 /*
2477 * Peer doesn't like our authentication method,
2478 * deny.
2479 */
2480 if (debug)
2481 addlog("[access denied]\n");
2482 lcp.Close(sp);
2483 break;
2484 }
2485 }
2486 if (debug)
2487 addlog("\n");
2488 free(buf, M_TEMP);
2489 return;
2490 }
2491
2492 static void
2493 sppp_lcp_tlu(struct sppp *sp)
2494 {
2495 STDDCL;
2496 int i;
2497 u_int32_t mask;
2498
2499 /* XXX ? */
2500 if (! (ifp->if_flags & IFF_UP) &&
2501 (ifp->if_flags & IFF_RUNNING)) {
2502 /* Coming out of loopback mode. */
2503 if_up(ifp);
2504 }
2505
2506 for (i = 0; i < IDX_COUNT; i++)
2507 if ((cps[i])->flags & CP_QUAL)
2508 (cps[i])->Open(sp);
2509
2510 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2511 (sp->pp_flags & PP_NEEDAUTH) != 0)
2512 sp->pp_phase = SPPP_PHASE_AUTHENTICATE;
2513 else
2514 sp->pp_phase = SPPP_PHASE_NETWORK;
2515
2516 if (debug)
2517 {
2518 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname,
2519 sppp_phase_name(sp->pp_phase));
2520 }
2521
2522 /*
2523 * Open all authentication protocols. This is even required
2524 * if we already proceeded to network phase, since it might be
2525 * that remote wants us to authenticate, so we might have to
2526 * send a PAP request. Undesired authentication protocols
2527 * don't do anything when they get an Open event.
2528 */
2529 for (i = 0; i < IDX_COUNT; i++)
2530 if ((cps[i])->flags & CP_AUTH)
2531 (cps[i])->Open(sp);
2532
2533 if (sp->pp_phase == SPPP_PHASE_NETWORK) {
2534 /* Notify all NCPs. */
2535 for (i = 0; i < IDX_COUNT; i++)
2536 if ((cps[i])->flags & CP_NCP)
2537 (cps[i])->Open(sp);
2538 }
2539
2540 /* Send Up events to all started protos. */
2541 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2542 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2543 (cps[i])->Up(sp);
2544
2545 /* notify low-level driver of state change */
2546 if (sp->pp_chg)
2547 sp->pp_chg(sp, (int)sp->pp_phase);
2548
2549 if (sp->pp_phase == SPPP_PHASE_NETWORK)
2550 /* if no NCP is starting, close down */
2551 sppp_lcp_check_and_close(sp);
2552 }
2553
2554 static void
2555 sppp_lcp_tld(struct sppp *sp)
2556 {
2557 STDDCL;
2558 int i;
2559 u_int32_t mask;
2560
2561 sp->pp_phase = SPPP_PHASE_TERMINATE;
2562
2563 if (debug)
2564 {
2565 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname,
2566 sppp_phase_name(sp->pp_phase));
2567 }
2568
2569 /*
2570 * Take upper layers down. We send the Down event first and
2571 * the Close second to prevent the upper layers from sending
2572 * ``a flurry of terminate-request packets'', as the RFC
2573 * describes it.
2574 */
2575 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2576 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2577 (cps[i])->Down(sp);
2578 (cps[i])->Close(sp);
2579 }
2580 }
2581
2582 static void
2583 sppp_lcp_tls(struct sppp *sp)
2584 {
2585 STDDCL;
2586
2587 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) {
2588 printf("%s: authentication failed %d times, not retrying again\n",
2589 sp->pp_if.if_xname, sp->pp_auth_failures);
2590 if_down(&sp->pp_if);
2591 return;
2592 }
2593
2594 sp->pp_phase = SPPP_PHASE_ESTABLISH;
2595
2596 if (debug)
2597 {
2598 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname,
2599 sppp_phase_name(sp->pp_phase));
2600 }
2601
2602 /* Notify lower layer if desired. */
2603 if (sp->pp_tls)
2604 (sp->pp_tls)(sp);
2605 }
2606
2607 static void
2608 sppp_lcp_tlf(struct sppp *sp)
2609 {
2610 STDDCL;
2611
2612 sp->pp_phase = SPPP_PHASE_DEAD;
2613
2614 if (debug)
2615 {
2616 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname,
2617 sppp_phase_name(sp->pp_phase));
2618 }
2619
2620 /* Notify lower layer if desired. */
2621 if (sp->pp_tlf)
2622 (sp->pp_tlf)(sp);
2623 }
2624
2625 static void
2626 sppp_lcp_scr(struct sppp *sp)
2627 {
2628 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2629 int i = 0;
2630 u_short authproto;
2631
2632 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2633 if (! sp->lcp.magic)
2634 sp->lcp.magic = arc4random();
2635 opt[i++] = LCP_OPT_MAGIC;
2636 opt[i++] = 6;
2637 opt[i++] = sp->lcp.magic >> 24;
2638 opt[i++] = sp->lcp.magic >> 16;
2639 opt[i++] = sp->lcp.magic >> 8;
2640 opt[i++] = sp->lcp.magic;
2641 }
2642
2643 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2644 opt[i++] = LCP_OPT_MRU;
2645 opt[i++] = 4;
2646 opt[i++] = sp->lcp.mru >> 8;
2647 opt[i++] = sp->lcp.mru;
2648 }
2649
2650 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2651 authproto = sp->hisauth.proto;
2652 opt[i++] = LCP_OPT_AUTH_PROTO;
2653 opt[i++] = authproto == PPP_CHAP? 5: 4;
2654 opt[i++] = authproto >> 8;
2655 opt[i++] = authproto;
2656 if (authproto == PPP_CHAP)
2657 opt[i++] = CHAP_MD5;
2658 }
2659
2660 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2661 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2662 }
2663
2664 /*
2665 * Check the open NCPs, return true if at least one NCP is open.
2666 */
2667 static int
2668 sppp_ncp_check(struct sppp *sp)
2669 {
2670 int i, mask;
2671
2672 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2673 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2674 return 1;
2675 return 0;
2676 }
2677
2678 /*
2679 * Re-check the open NCPs and see if we should terminate the link.
2680 * Called by the NCPs during their tlf action handling.
2681 */
2682 static void
2683 sppp_lcp_check_and_close(struct sppp *sp)
2684 {
2685
2686 if (sp->pp_phase < SPPP_PHASE_NETWORK)
2687 /* don't bother, we are already going down */
2688 return;
2689
2690 if (sppp_ncp_check(sp))
2691 return;
2692
2693 lcp.Close(sp);
2694 }
2695
2696
2697 /*
2698 *--------------------------------------------------------------------------*
2699 * *
2700 * The IPCP implementation. *
2701 * *
2702 *--------------------------------------------------------------------------*
2703 */
2704
2705 static void
2706 sppp_ipcp_init(struct sppp *sp)
2707 {
2708 sp->ipcp.opts = 0;
2709 sp->ipcp.flags = 0;
2710 sp->state[IDX_IPCP] = STATE_INITIAL;
2711 sp->fail_counter[IDX_IPCP] = 0;
2712 sp->pp_seq[IDX_IPCP] = 0;
2713 sp->pp_rseq[IDX_IPCP] = 0;
2714 callout_init(&sp->ch[IDX_IPCP]);
2715 }
2716
2717 static void
2718 sppp_ipcp_up(struct sppp *sp)
2719 {
2720 sppp_up_event(&ipcp, sp);
2721 }
2722
2723 static void
2724 sppp_ipcp_down(struct sppp *sp)
2725 {
2726 sppp_down_event(&ipcp, sp);
2727 }
2728
2729 static void
2730 sppp_ipcp_open(struct sppp *sp)
2731 {
2732 STDDCL;
2733 u_int32_t myaddr, hisaddr;
2734
2735 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN);
2736 sp->ipcp.req_myaddr = 0;
2737 sp->ipcp.req_hisaddr = 0;
2738 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs);
2739
2740 #ifdef INET
2741 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2742 #else
2743 myaddr = hisaddr = 0;
2744 #endif
2745 /*
2746 * If we don't have his address, this probably means our
2747 * interface doesn't want to talk IP at all. (This could
2748 * be the case if somebody wants to speak only IPX, for
2749 * example.) Don't open IPCP in this case.
2750 */
2751 if (hisaddr == 0) {
2752 /* XXX this message should go away */
2753 if (debug)
2754 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n",
2755 ifp->if_xname);
2756 return;
2757 }
2758
2759 if (myaddr == 0) {
2760 /*
2761 * I don't have an assigned address, so i need to
2762 * negotiate my address.
2763 */
2764 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2765 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2766 }
2767 if (hisaddr == 1) {
2768 /*
2769 * XXX - remove this hack!
2770 * remote has no valid address, we need to get one assigned.
2771 */
2772 sp->ipcp.flags |= IPCP_HISADDR_DYN;
2773 }
2774 sppp_open_event(&ipcp, sp);
2775 }
2776
2777 static void
2778 sppp_ipcp_close(struct sppp *sp)
2779 {
2780 STDDCL;
2781
2782 sppp_close_event(&ipcp, sp);
2783 #ifdef INET
2784 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN))
2785 /*
2786 * Some address was dynamic, clear it again.
2787 */
2788 sppp_clear_ip_addrs(sp);
2789 #endif
2790
2791 if (sp->pp_saved_mtu > 0) {
2792 ifp->if_mtu = sp->pp_saved_mtu;
2793 sp->pp_saved_mtu = 0;
2794 if (debug)
2795 log(LOG_DEBUG,
2796 "%s: resetting MTU to %" PRIu64 " bytes\n",
2797 ifp->if_xname, ifp->if_mtu);
2798 }
2799 }
2800
2801 static void
2802 sppp_ipcp_TO(void *cookie)
2803 {
2804 sppp_to_event(&ipcp, (struct sppp *)cookie);
2805 }
2806
2807 /*
2808 * Analyze a configure request. Return true if it was agreeable, and
2809 * caused action sca, false if it has been rejected or nak'ed, and
2810 * caused action scn. (The return value is used to make the state
2811 * transition decision in the state automaton.)
2812 */
2813 static int
2814 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2815 {
2816 u_char *buf, *r, *p;
2817 struct ifnet *ifp = &sp->pp_if;
2818 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2819 u_int32_t hisaddr, desiredaddr;
2820
2821 len -= 4;
2822 origlen = len;
2823 /*
2824 * Make sure to allocate a buf that can at least hold a
2825 * conf-nak with an `address' option. We might need it below.
2826 */
2827 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
2828 if (! buf)
2829 return (0);
2830
2831 /* pass 1: see if we can recognize them */
2832 if (debug)
2833 log(LOG_DEBUG, "%s: ipcp parse opts:",
2834 ifp->if_xname);
2835 p = (void *)(h + 1);
2836 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2837 if (debug)
2838 addlog(" %s", sppp_ipcp_opt_name(*p));
2839 switch (*p) {
2840 #ifdef notyet
2841 case IPCP_OPT_COMPRESSION:
2842 if (len >= 6 && p[1] >= 6) {
2843 /* correctly formed compress option */
2844 continue;
2845 }
2846 if (debug)
2847 addlog(" [invalid]");
2848 break;
2849 #endif
2850 case IPCP_OPT_ADDRESS:
2851 if (len >= 6 && p[1] == 6) {
2852 /* correctly formed address option */
2853 continue;
2854 }
2855 if (debug)
2856 addlog(" [invalid]");
2857 break;
2858 default:
2859 /* Others not supported. */
2860 if (debug)
2861 addlog(" [rej]");
2862 break;
2863 }
2864 /* Add the option to rejected list. */
2865 bcopy (p, r, p[1]);
2866 r += p[1];
2867 rlen += p[1];
2868 }
2869 if (rlen) {
2870 if (debug)
2871 addlog(" send conf-rej\n");
2872 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
2873 goto end;
2874 } else if (debug)
2875 addlog("\n");
2876
2877 /* pass 2: parse option values */
2878 if (sp->ipcp.flags & IPCP_HISADDR_SEEN)
2879 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */
2880 else
2881 #ifdef INET
2882 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */
2883 #else
2884 hisaddr = 0;
2885 #endif
2886 if (debug)
2887 log(LOG_DEBUG, "%s: ipcp parse opt values: ",
2888 ifp->if_xname);
2889 p = (void *)(h + 1);
2890 len = origlen;
2891 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2892 if (debug)
2893 addlog(" %s", sppp_ipcp_opt_name(*p));
2894 switch (*p) {
2895 #ifdef notyet
2896 case IPCP_OPT_COMPRESSION:
2897 continue;
2898 #endif
2899 case IPCP_OPT_ADDRESS:
2900 desiredaddr = p[2] << 24 | p[3] << 16 |
2901 p[4] << 8 | p[5];
2902 if (desiredaddr == hisaddr ||
2903 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) {
2904 /*
2905 * Peer's address is same as our value,
2906 * this is agreeable. Gonna conf-ack
2907 * it.
2908 */
2909 if (debug)
2910 addlog(" %s [ack]",
2911 sppp_dotted_quad(hisaddr));
2912 /* record that we've seen it already */
2913 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
2914 sp->ipcp.req_hisaddr = desiredaddr;
2915 hisaddr = desiredaddr;
2916 continue;
2917 }
2918 /*
2919 * The address wasn't agreeable. This is either
2920 * he sent us 0.0.0.0, asking to assign him an
2921 * address, or he send us another address not
2922 * matching our value. Either case, we gonna
2923 * conf-nak it with our value.
2924 */
2925 if (debug) {
2926 if (desiredaddr == 0)
2927 addlog(" [addr requested]");
2928 else
2929 addlog(" %s [not agreed]",
2930 sppp_dotted_quad(desiredaddr));
2931 }
2932
2933 p[2] = hisaddr >> 24;
2934 p[3] = hisaddr >> 16;
2935 p[4] = hisaddr >> 8;
2936 p[5] = hisaddr;
2937 break;
2938 }
2939 /* Add the option to nak'ed list. */
2940 bcopy (p, r, p[1]);
2941 r += p[1];
2942 rlen += p[1];
2943 }
2944
2945 /*
2946 * If we are about to conf-ack the request, but haven't seen
2947 * his address so far, gonna conf-nak it instead, with the
2948 * `address' option present and our idea of his address being
2949 * filled in there, to request negotiation of both addresses.
2950 *
2951 * XXX This can result in an endless req - nak loop if peer
2952 * doesn't want to send us his address. Q: What should we do
2953 * about it? XXX A: implement the max-failure counter.
2954 */
2955 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) {
2956 buf[0] = IPCP_OPT_ADDRESS;
2957 buf[1] = 6;
2958 buf[2] = hisaddr >> 24;
2959 buf[3] = hisaddr >> 16;
2960 buf[4] = hisaddr >> 8;
2961 buf[5] = hisaddr;
2962 rlen = 6;
2963 if (debug)
2964 addlog(" still need hisaddr");
2965 }
2966
2967 if (rlen) {
2968 if (debug)
2969 addlog(" send conf-nak\n");
2970 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
2971 } else {
2972 if (debug)
2973 addlog(" send conf-ack\n");
2974 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1);
2975 }
2976
2977 end:
2978 free(buf, M_TEMP);
2979 return (rlen == 0);
2980 }
2981
2982 /*
2983 * Analyze the IPCP Configure-Reject option list, and adjust our
2984 * negotiation.
2985 */
2986 static void
2987 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2988 {
2989 u_char *buf, *p;
2990 struct ifnet *ifp = &sp->pp_if;
2991 int debug = ifp->if_flags & IFF_DEBUG;
2992
2993 len -= 4;
2994 buf = malloc (len, M_TEMP, M_NOWAIT);
2995 if (!buf)
2996 return;
2997
2998 if (debug)
2999 log(LOG_DEBUG, "%s: ipcp rej opts:",
3000 ifp->if_xname);
3001
3002 p = (void *)(h + 1);
3003 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3004 if (debug)
3005 addlog(" %s", sppp_ipcp_opt_name(*p));
3006 switch (*p) {
3007 case IPCP_OPT_ADDRESS:
3008 /*
3009 * Peer doesn't grok address option. This is
3010 * bad. XXX Should we better give up here?
3011 */
3012 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3013 break;
3014 #ifdef notyet
3015 case IPCP_OPT_COMPRESS:
3016 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS);
3017 break;
3018 #endif
3019 }
3020 }
3021 if (debug)
3022 addlog("\n");
3023 free(buf, M_TEMP);
3024 return;
3025 }
3026
3027 /*
3028 * Analyze the IPCP Configure-NAK option list, and adjust our
3029 * negotiation.
3030 */
3031 static void
3032 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3033 {
3034 u_char *p;
3035 struct ifnet *ifp = &sp->pp_if;
3036 int debug = ifp->if_flags & IFF_DEBUG;
3037 u_int32_t wantaddr;
3038
3039 len -= 4;
3040
3041 if (debug)
3042 log(LOG_DEBUG, "%s: ipcp nak opts:",
3043 ifp->if_xname);
3044
3045 p = (void *)(h + 1);
3046 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3047 if (debug)
3048 addlog(" %s", sppp_ipcp_opt_name(*p));
3049 switch (*p) {
3050 case IPCP_OPT_ADDRESS:
3051 /*
3052 * Peer doesn't like our local IP address. See
3053 * if we can do something for him. We'll drop
3054 * him our address then.
3055 */
3056 if (len >= 6 && p[1] == 6) {
3057 wantaddr = p[2] << 24 | p[3] << 16 |
3058 p[4] << 8 | p[5];
3059 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3060 if (debug)
3061 addlog(" [wantaddr %s]",
3062 sppp_dotted_quad(wantaddr));
3063 /*
3064 * When doing dynamic address assignment,
3065 * we accept his offer. Otherwise, we
3066 * ignore it and thus continue to negotiate
3067 * our already existing value.
3068 */
3069 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3070 if (debug)
3071 addlog(" [agree]");
3072 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3073 sp->ipcp.req_myaddr = wantaddr;
3074 }
3075 }
3076 break;
3077
3078 case IPCP_OPT_PRIMDNS:
3079 if (len >= 6 && p[1] == 6) {
3080 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 |
3081 p[4] << 8 | p[5];
3082 }
3083 break;
3084
3085 case IPCP_OPT_SECDNS:
3086 if (len >= 6 && p[1] == 6) {
3087 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 |
3088 p[4] << 8 | p[5];
3089 }
3090 break;
3091 #ifdef notyet
3092 case IPCP_OPT_COMPRESS:
3093 /*
3094 * Peer wants different compression parameters.
3095 */
3096 break;
3097 #endif
3098 }
3099 }
3100 if (debug)
3101 addlog("\n");
3102 return;
3103 }
3104
3105 static void
3106 sppp_ipcp_tlu(struct sppp *sp)
3107 {
3108 #ifdef INET
3109 /* we are up. Set addresses and notify anyone interested */
3110 STDDCL;
3111 u_int32_t myaddr, hisaddr;
3112
3113 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
3114 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN))
3115 myaddr = sp->ipcp.req_myaddr;
3116 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN))
3117 hisaddr = sp->ipcp.req_hisaddr;
3118 sppp_set_ip_addrs(sp, myaddr, hisaddr);
3119
3120 if (ifp->if_mtu > sp->lcp.their_mru) {
3121 sp->pp_saved_mtu = ifp->if_mtu;
3122 ifp->if_mtu = sp->lcp.their_mru;
3123 if (debug)
3124 log(LOG_DEBUG,
3125 "%s: setting MTU to %" PRIu64 " bytes\n",
3126 ifp->if_xname, ifp->if_mtu);
3127 }
3128
3129 if (sp->pp_con)
3130 sp->pp_con(sp);
3131 #endif
3132 }
3133
3134 static void
3135 sppp_ipcp_tld(struct sppp *sp)
3136 {
3137 }
3138
3139 static void
3140 sppp_ipcp_tls(struct sppp *sp)
3141 {
3142 /* indicate to LCP that it must stay alive */
3143 sp->lcp.protos |= (1 << IDX_IPCP);
3144 }
3145
3146 static void
3147 sppp_ipcp_tlf(struct sppp *sp)
3148 {
3149 /* we no longer need LCP */
3150 sp->lcp.protos &= ~(1 << IDX_IPCP);
3151 }
3152
3153 static void
3154 sppp_ipcp_scr(struct sppp *sp)
3155 {
3156 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */];
3157 #ifdef INET
3158 u_int32_t ouraddr;
3159 #endif
3160 int i = 0;
3161
3162 #ifdef notyet
3163 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3164 opt[i++] = IPCP_OPT_COMPRESSION;
3165 opt[i++] = 6;
3166 opt[i++] = 0; /* VJ header compression */
3167 opt[i++] = 0x2d; /* VJ header compression */
3168 opt[i++] = max_slot_id;
3169 opt[i++] = comp_slot_id;
3170 }
3171 #endif
3172
3173 #ifdef INET
3174 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3175 if (sp->ipcp.flags & IPCP_MYADDR_SEEN)
3176 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */
3177 else
3178 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3179 opt[i++] = IPCP_OPT_ADDRESS;
3180 opt[i++] = 6;
3181 opt[i++] = ouraddr >> 24;
3182 opt[i++] = ouraddr >> 16;
3183 opt[i++] = ouraddr >> 8;
3184 opt[i++] = ouraddr;
3185 }
3186 #endif
3187
3188 if (sp->query_dns & 1) {
3189 opt[i++] = IPCP_OPT_PRIMDNS;
3190 opt[i++] = 6;
3191 opt[i++] = sp->dns_addrs[0] >> 24;
3192 opt[i++] = sp->dns_addrs[0] >> 16;
3193 opt[i++] = sp->dns_addrs[0] >> 8;
3194 opt[i++] = sp->dns_addrs[0];
3195 }
3196 if (sp->query_dns & 2) {
3197 opt[i++] = IPCP_OPT_SECDNS;
3198 opt[i++] = 6;
3199 opt[i++] = sp->dns_addrs[1] >> 24;
3200 opt[i++] = sp->dns_addrs[1] >> 16;
3201 opt[i++] = sp->dns_addrs[1] >> 8;
3202 opt[i++] = sp->dns_addrs[1];
3203 }
3204
3205 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3206 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3207 }
3208
3209
3210 /*
3211 *--------------------------------------------------------------------------*
3212 * *
3213 * The IPv6CP implementation. *
3214 * *
3215 *--------------------------------------------------------------------------*
3216 */
3217
3218 #ifdef INET6
3219 static void
3220 sppp_ipv6cp_init(struct sppp *sp)
3221 {
3222 sp->ipv6cp.opts = 0;
3223 sp->ipv6cp.flags = 0;
3224 sp->state[IDX_IPV6CP] = STATE_INITIAL;
3225 sp->fail_counter[IDX_IPV6CP] = 0;
3226 sp->pp_seq[IDX_IPV6CP] = 0;
3227 sp->pp_rseq[IDX_IPV6CP] = 0;
3228 callout_init(&sp->ch[IDX_IPV6CP]);
3229 }
3230
3231 static void
3232 sppp_ipv6cp_up(struct sppp *sp)
3233 {
3234 sppp_up_event(&ipv6cp, sp);
3235 }
3236
3237 static void
3238 sppp_ipv6cp_down(struct sppp *sp)
3239 {
3240 sppp_down_event(&ipv6cp, sp);
3241 }
3242
3243 static void
3244 sppp_ipv6cp_open(struct sppp *sp)
3245 {
3246 STDDCL;
3247 struct in6_addr myaddr, hisaddr;
3248
3249 #ifdef IPV6CP_MYIFID_DYN
3250 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3251 #else
3252 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3253 #endif
3254
3255 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3256 /*
3257 * If we don't have our address, this probably means our
3258 * interface doesn't want to talk IPv6 at all. (This could
3259 * be the case if somebody wants to speak only IPX, for
3260 * example.) Don't open IPv6CP in this case.
3261 */
3262 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3263 /* XXX this message should go away */
3264 if (debug)
3265 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n",
3266 ifp->if_xname);
3267 return;
3268 }
3269
3270 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3271 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3272 sppp_open_event(&ipv6cp, sp);
3273 }
3274
3275 static void
3276 sppp_ipv6cp_close(struct sppp *sp)
3277 {
3278 sppp_close_event(&ipv6cp, sp);
3279 }
3280
3281 static void
3282 sppp_ipv6cp_TO(void *cookie)
3283 {
3284 sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3285 }
3286
3287 /*
3288 * Analyze a configure request. Return true if it was agreeable, and
3289 * caused action sca, false if it has been rejected or nak'ed, and
3290 * caused action scn. (The return value is used to make the state
3291 * transition decision in the state automaton.)
3292 */
3293 static int
3294 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3295 {
3296 u_char *buf, *r, *p;
3297 struct ifnet *ifp = &sp->pp_if;
3298 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3299 struct in6_addr myaddr, desiredaddr, suggestaddr;
3300 int ifidcount;
3301 int type;
3302 int collision, nohisaddr;
3303
3304 len -= 4;
3305 origlen = len;
3306 /*
3307 * Make sure to allocate a buf that can at least hold a
3308 * conf-nak with an `address' option. We might need it below.
3309 */
3310 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
3311 if (! buf)
3312 return (0);
3313
3314 /* pass 1: see if we can recognize them */
3315 if (debug)
3316 log(LOG_DEBUG, "%s: ipv6cp parse opts:",
3317 ifp->if_xname);
3318 p = (void *)(h + 1);
3319 ifidcount = 0;
3320 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3321 if (debug)
3322 addlog(" %s", sppp_ipv6cp_opt_name(*p));
3323 switch (*p) {
3324 case IPV6CP_OPT_IFID:
3325 if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3326 /* correctly formed address option */
3327 ifidcount++;
3328 continue;
3329 }
3330 if (debug)
3331 addlog(" [invalid]");
3332 break;
3333 #ifdef notyet
3334 case IPV6CP_OPT_COMPRESSION:
3335 if (len >= 4 && p[1] >= 4) {
3336 /* correctly formed compress option */
3337 continue;
3338 }
3339 if (debug)
3340 addlog(" [invalid]");
3341 break;
3342 #endif
3343 default:
3344 /* Others not supported. */
3345 if (debug)
3346 addlog(" [rej]");
3347 break;
3348 }
3349 /* Add the option to rejected list. */
3350 bcopy (p, r, p[1]);
3351 r += p[1];
3352 rlen += p[1];
3353 }
3354 if (rlen) {
3355 if (debug)
3356 addlog(" send conf-rej\n");
3357 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3358 goto end;
3359 } else if (debug)
3360 addlog("\n");
3361
3362 /* pass 2: parse option values */
3363 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3364 if (debug)
3365 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ",
3366 ifp->if_xname);
3367 p = (void *)(h + 1);
3368 len = origlen;
3369 type = CONF_ACK;
3370 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3371 if (debug)
3372 addlog(" %s", sppp_ipv6cp_opt_name(*p));
3373 switch (*p) {
3374 #ifdef notyet
3375 case IPV6CP_OPT_COMPRESSION:
3376 continue;
3377 #endif
3378 case IPV6CP_OPT_IFID:
3379 memset(&desiredaddr, 0, sizeof(desiredaddr));
3380 bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3381 collision = (memcmp(&desiredaddr.s6_addr[8],
3382 &myaddr.s6_addr[8], 8) == 0);
3383 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3384
3385 desiredaddr.s6_addr16[0] = htons(0xfe80);
3386 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL);
3387
3388 if (!collision && !nohisaddr) {
3389 /* no collision, hisaddr known - Conf-Ack */
3390 type = CONF_ACK;
3391
3392 if (debug) {
3393 addlog(" %s [%s]",
3394 ip6_sprintf(&desiredaddr),
3395 sppp_cp_type_name(type));
3396 }
3397 continue;
3398 }
3399
3400 memset(&suggestaddr, 0, sizeof(&suggestaddr));
3401 if (collision && nohisaddr) {
3402 /* collision, hisaddr unknown - Conf-Rej */
3403 type = CONF_REJ;
3404 memset(&p[2], 0, 8);
3405 } else {
3406 /*
3407 * - no collision, hisaddr unknown, or
3408 * - collision, hisaddr known
3409 * Conf-Nak, suggest hisaddr
3410 */
3411 type = CONF_NAK;
3412 sppp_suggest_ip6_addr(sp, &suggestaddr);
3413 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3414 }
3415 if (debug)
3416 addlog(" %s [%s]", ip6_sprintf(&desiredaddr),
3417 sppp_cp_type_name(type));
3418 break;
3419 }
3420 /* Add the option to nak'ed list. */
3421 bcopy (p, r, p[1]);
3422 r += p[1];
3423 rlen += p[1];
3424 }
3425
3426 if (rlen == 0 && type == CONF_ACK) {
3427 if (debug)
3428 addlog(" send %s\n", sppp_cp_type_name(type));
3429 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1);
3430 } else {
3431 #ifdef notdef
3432 if (type == CONF_ACK)
3433 panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3434 #endif
3435
3436 if (debug) {
3437 addlog(" send %s suggest %s\n",
3438 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr));
3439 }
3440 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3441 }
3442
3443 end:
3444 free(buf, M_TEMP);
3445 return (rlen == 0);
3446 }
3447
3448 /*
3449 * Analyze the IPv6CP Configure-Reject option list, and adjust our
3450 * negotiation.
3451 */
3452 static void
3453 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3454 {
3455 u_char *buf, *p;
3456 struct ifnet *ifp = &sp->pp_if;
3457 int debug = ifp->if_flags & IFF_DEBUG;
3458
3459 len -= 4;
3460 buf = malloc (len, M_TEMP, M_NOWAIT);
3461 if (!buf)
3462 return;
3463
3464 if (debug)
3465 log(LOG_DEBUG, "%s: ipv6cp rej opts:",
3466 ifp->if_xname);
3467
3468 p = (void *)(h + 1);
3469 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3470 if (debug)
3471 addlog(" %s", sppp_ipv6cp_opt_name(*p));
3472 switch (*p) {
3473 case IPV6CP_OPT_IFID:
3474 /*
3475 * Peer doesn't grok address option. This is
3476 * bad. XXX Should we better give up here?
3477 */
3478 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3479 break;
3480 #ifdef notyet
3481 case IPV6CP_OPT_COMPRESS:
3482 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3483 break;
3484 #endif
3485 }
3486 }
3487 if (debug)
3488 addlog("\n");
3489 free(buf, M_TEMP);
3490 return;
3491 }
3492
3493 /*
3494 * Analyze the IPv6CP Configure-NAK option list, and adjust our
3495 * negotiation.
3496 */
3497 static void
3498 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3499 {
3500 u_char *buf, *p;
3501 struct ifnet *ifp = &sp->pp_if;
3502 int debug = ifp->if_flags & IFF_DEBUG;
3503 struct in6_addr suggestaddr;
3504
3505 len -= 4;
3506 buf = malloc (len, M_TEMP, M_NOWAIT);
3507 if (!buf)
3508 return;
3509
3510 if (debug)
3511 log(LOG_DEBUG, "%s: ipv6cp nak opts:",
3512 ifp->if_xname);
3513
3514 p = (void *)(h + 1);
3515 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3516 if (debug)
3517 addlog(" %s", sppp_ipv6cp_opt_name(*p));
3518 switch (*p) {
3519 case IPV6CP_OPT_IFID:
3520 /*
3521 * Peer doesn't like our local ifid. See
3522 * if we can do something for him. We'll drop
3523 * him our address then.
3524 */
3525 if (len < 10 || p[1] != 10)
3526 break;
3527 memset(&suggestaddr, 0, sizeof(suggestaddr));
3528 suggestaddr.s6_addr16[0] = htons(0xfe80);
3529 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL);
3530 bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3531
3532 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3533 if (debug)
3534 addlog(" [suggestaddr %s]",
3535 ip6_sprintf(&suggestaddr));
3536 #ifdef IPV6CP_MYIFID_DYN
3537 /*
3538 * When doing dynamic address assignment,
3539 * we accept his offer.
3540 */
3541 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3542 struct in6_addr lastsuggest;
3543 /*
3544 * If <suggested myaddr from peer> equals to
3545 * <hisaddr we have suggested last time>,
3546 * we have a collision. generate new random
3547 * ifid.
3548 */
3549 sppp_suggest_ip6_addr(&lastsuggest);
3550 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3551 lastsuggest)) {
3552 if (debug)
3553 addlog(" [random]");
3554 sppp_gen_ip6_addr(sp, &suggestaddr);
3555 }
3556 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3557 if (debug)
3558 addlog(" [agree]");
3559 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3560 }
3561 #else
3562 /*
3563 * Since we do not do dynamic address assignment,
3564 * we ignore it and thus continue to negotiate
3565 * our already existing value. This can possibly
3566 * go into infinite request-reject loop.
3567 *
3568 * This is not likely because we normally use
3569 * ifid based on MAC-address.
3570 * If you have no ethernet card on the node, too bad.
3571 * XXX should we use fail_counter?
3572 */
3573 #endif
3574 break;
3575 #ifdef notyet
3576 case IPV6CP_OPT_COMPRESS:
3577 /*
3578 * Peer wants different compression parameters.
3579 */
3580 break;
3581 #endif
3582 }
3583 }
3584 if (debug)
3585 addlog("\n");
3586 free(buf, M_TEMP);
3587 return;
3588 }
3589
3590 static void
3591 sppp_ipv6cp_tlu(struct sppp *sp)
3592 {
3593 /* we are up - notify isdn daemon */
3594 if (sp->pp_con)
3595 sp->pp_con(sp);
3596 }
3597
3598 static void
3599 sppp_ipv6cp_tld(struct sppp *sp)
3600 {
3601 }
3602
3603 static void
3604 sppp_ipv6cp_tls(struct sppp *sp)
3605 {
3606 /* indicate to LCP that it must stay alive */
3607 sp->lcp.protos |= (1 << IDX_IPV6CP);
3608 }
3609
3610 static void
3611 sppp_ipv6cp_tlf(struct sppp *sp)
3612 {
3613 /* we no longer need LCP */
3614 sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3615 }
3616
3617 static void
3618 sppp_ipv6cp_scr(struct sppp *sp)
3619 {
3620 char opt[10 /* ifid */ + 4 /* compression, minimum */];
3621 struct in6_addr ouraddr;
3622 int i = 0;
3623
3624 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3625 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3626 opt[i++] = IPV6CP_OPT_IFID;
3627 opt[i++] = 10;
3628 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3629 i += 8;
3630 }
3631
3632 #ifdef notyet
3633 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3634 opt[i++] = IPV6CP_OPT_COMPRESSION;
3635 opt[i++] = 4;
3636 opt[i++] = 0; /* TBD */
3637 opt[i++] = 0; /* TBD */
3638 /* variable length data may follow */
3639 }
3640 #endif
3641
3642 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3643 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3644 }
3645 #else /*INET6*/
3646 static void sppp_ipv6cp_init(struct sppp *sp)
3647 {
3648 }
3649
3650 static void sppp_ipv6cp_up(struct sppp *sp)
3651 {
3652 }
3653
3654 static void sppp_ipv6cp_down(struct sppp *sp)
3655 {
3656 }
3657
3658
3659 static void sppp_ipv6cp_open(struct sppp *sp)
3660 {
3661 }
3662
3663 static void sppp_ipv6cp_close(struct sppp *sp)
3664 {
3665 }
3666
3667 static void sppp_ipv6cp_TO(void *sp)
3668 {
3669 }
3670
3671 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3672 {
3673 return 0;
3674 }
3675
3676 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3677 {
3678 }
3679
3680 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3681 {
3682 }
3683
3684 static void sppp_ipv6cp_tlu(struct sppp *sp)
3685 {
3686 }
3687
3688 static void sppp_ipv6cp_tld(struct sppp *sp)
3689 {
3690 }
3691
3692 static void sppp_ipv6cp_tls(struct sppp *sp)
3693 {
3694 }
3695
3696 static void sppp_ipv6cp_tlf(struct sppp *sp)
3697 {
3698 }
3699
3700 static void sppp_ipv6cp_scr(struct sppp *sp)
3701 {
3702 }
3703 #endif /*INET6*/
3704
3705
3706 /*
3707 *--------------------------------------------------------------------------*
3708 * *
3709 * The CHAP implementation. *
3710 * *
3711 *--------------------------------------------------------------------------*
3712 */
3713
3714 /*
3715 * The authentication protocols don't employ a full-fledged state machine as
3716 * the control protocols do, since they do have Open and Close events, but
3717 * not Up and Down, nor are they explicitly terminated. Also, use of the
3718 * authentication protocols may be different in both directions (this makes
3719 * sense, think of a machine that never accepts incoming calls but only
3720 * calls out, it doesn't require the called party to authenticate itself).
3721 *
3722 * Our state machine for the local authentication protocol (we are requesting
3723 * the peer to authenticate) looks like:
3724 *
3725 * RCA-
3726 * +--------------------------------------------+
3727 * V scn,tld|
3728 * +--------+ Close +---------+ RCA+
3729 * | |<----------------------------------| |------+
3730 * +--->| Closed | TO* | Opened | sca |
3731 * | | |-----+ +-------| |<-----+
3732 * | +--------+ irc | | +---------+
3733 * | ^ | | ^
3734 * | | | | |
3735 * | | | | |
3736 * | TO-| | | |
3737 * | |tld TO+ V | |
3738 * | | +------->+ | |
3739 * | | | | | |
3740 * | +--------+ V | |
3741 * | | |<----+<--------------------+ |
3742 * | | Req- | scr |
3743 * | | Sent | |
3744 * | | | |
3745 * | +--------+ |
3746 * | RCA- | | RCA+ |
3747 * +------+ +------------------------------------------+
3748 * scn,tld sca,irc,ict,tlu
3749 *
3750 *
3751 * with:
3752 *
3753 * Open: LCP reached authentication phase
3754 * Close: LCP reached terminate phase
3755 *
3756 * RCA+: received reply (pap-req, chap-response), acceptable
3757 * RCN: received reply (pap-req, chap-response), not acceptable
3758 * TO+: timeout with restart counter >= 0
3759 * TO-: timeout with restart counter < 0
3760 * TO*: reschedule timeout for CHAP
3761 *
3762 * scr: send request packet (none for PAP, chap-challenge)
3763 * sca: send ack packet (pap-ack, chap-success)
3764 * scn: send nak packet (pap-nak, chap-failure)
3765 * ict: initialize re-challenge timer (CHAP only)
3766 *
3767 * tlu: this-layer-up, LCP reaches network phase
3768 * tld: this-layer-down, LCP enters terminate phase
3769 *
3770 * Note that in CHAP mode, after sending a new challenge, while the state
3771 * automaton falls back into Req-Sent state, it doesn't signal a tld
3772 * event to LCP, so LCP remains in network phase. Only after not getting
3773 * any response (or after getting an unacceptable response), CHAP closes,
3774 * causing LCP to enter terminate phase.
3775 *
3776 * With PAP, there is no initial request that can be sent. The peer is
3777 * expected to send one based on the successful negotiation of PAP as
3778 * the authentication protocol during the LCP option negotiation.
3779 *
3780 * Incoming authentication protocol requests (remote requests
3781 * authentication, we are peer) don't employ a state machine at all,
3782 * they are simply answered. Some peers [Ascend P50 firmware rev
3783 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are
3784 * still in authentication phase (thereby violating the standard that
3785 * demands that these NCP packets are to be discarded), so we keep
3786 * track of the peer demanding us to authenticate, and only proceed to
3787 * phase network once we've seen a positive acknowledge for the
3788 * authentication.
3789 */
3790
3791 /*
3792 * Handle incoming CHAP packets.
3793 */
3794 void
3795 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3796 {
3797 STDDCL;
3798 struct lcp_header *h;
3799 int len, x;
3800 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize;
3801 int value_len, name_len;
3802 MD5_CTX ctx;
3803
3804 len = m->m_pkthdr.len;
3805 if (len < 4) {
3806 if (debug)
3807 log(LOG_DEBUG,
3808 "%s: chap invalid packet length: %d bytes\n",
3809 ifp->if_xname, len);
3810 return;
3811 }
3812 h = mtod(m, struct lcp_header *);
3813 if (len > ntohs(h->len))
3814 len = ntohs(h->len);
3815
3816 switch (h->type) {
3817 /* challenge, failure and success are his authproto */
3818 case CHAP_CHALLENGE:
3819 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) {
3820 /* can't do anything usefull */
3821 sp->pp_auth_failures++;
3822 printf("%s: chap input without my name and my secret being set\n",
3823 ifp->if_xname);
3824 break;
3825 }
3826 value = 1 + (u_char *)(h + 1);
3827 value_len = value[-1];
3828 name = value + value_len;
3829 name_len = len - value_len - 5;
3830 if (name_len < 0) {
3831 if (debug) {
3832 log(LOG_DEBUG,
3833 "%s: chap corrupted challenge "
3834 "<%s id=0x%x len=%d",
3835 ifp->if_xname,
3836 sppp_auth_type_name(PPP_CHAP, h->type),
3837 h->ident, ntohs(h->len));
3838 if (len > 4)
3839 sppp_print_bytes((u_char *)(h + 1),
3840 len - 4);
3841 addlog(">\n");
3842 }
3843 break;
3844 }
3845
3846 if (debug) {
3847 log(LOG_DEBUG,
3848 "%s: chap input <%s id=0x%x len=%d name=",
3849 ifp->if_xname,
3850 sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
3851 ntohs(h->len));
3852 sppp_print_string((char *) name, name_len);
3853 addlog(" value-size=%d value=", value_len);
3854 sppp_print_bytes(value, value_len);
3855 addlog(">\n");
3856 }
3857
3858 /* Compute reply value. */
3859 MD5Init(&ctx);
3860 MD5Update(&ctx, &h->ident, 1);
3861 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len);
3862 MD5Update(&ctx, value, value_len);
3863 MD5Final(digest, &ctx);
3864 dsize = sizeof digest;
3865
3866 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
3867 sizeof dsize, (const char *)&dsize,
3868 sizeof digest, digest,
3869 sp->myauth.name_len,
3870 sp->myauth.name,
3871 0);
3872 break;
3873
3874 case CHAP_SUCCESS:
3875 if (debug) {
3876 log(LOG_DEBUG, "%s: chap success",
3877 ifp->if_xname);
3878 if (len > 4) {
3879 addlog(": ");
3880 sppp_print_string((char *)(h + 1), len - 4);
3881 }
3882 addlog("\n");
3883 }
3884 x = splnet();
3885 sp->pp_auth_failures = 0;
3886 sp->pp_flags &= ~PP_NEEDAUTH;
3887 if (sp->myauth.proto == PPP_CHAP &&
3888 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
3889 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
3890 /*
3891 * We are authenticator for CHAP but didn't
3892 * complete yet. Leave it to tlu to proceed
3893 * to network phase.
3894 */
3895 splx(x);
3896 break;
3897 }
3898 splx(x);
3899 sppp_phase_network(sp);
3900 break;
3901
3902 case CHAP_FAILURE:
3903 x = splnet();
3904 sp->pp_auth_failures++;
3905 splx(x);
3906 if (debug) {
3907 log(LOG_INFO, "%s: chap failure",
3908 ifp->if_xname);
3909 if (len > 4) {
3910 addlog(": ");
3911 sppp_print_string((char *)(h + 1), len - 4);
3912 }
3913 addlog("\n");
3914 } else
3915 log(LOG_INFO, "%s: chap failure\n",
3916 ifp->if_xname);
3917 /* await LCP shutdown by authenticator */
3918 break;
3919
3920 /* response is my authproto */
3921 case CHAP_RESPONSE:
3922 if (sp->hisauth.secret == NULL) {
3923 /* can't do anything usefull */
3924 printf("%s: chap input without his secret being set\n",
3925 ifp->if_xname);
3926 break;
3927 }
3928 value = 1 + (u_char *)(h + 1);
3929 value_len = value[-1];
3930 name = value + value_len;
3931 name_len = len - value_len - 5;
3932 if (name_len < 0) {
3933 if (debug) {
3934 log(LOG_DEBUG,
3935 "%s: chap corrupted response "
3936 "<%s id=0x%x len=%d",
3937 ifp->if_xname,
3938 sppp_auth_type_name(PPP_CHAP, h->type),
3939 h->ident, ntohs(h->len));
3940 if (len > 4)
3941 sppp_print_bytes((u_char *)(h + 1),
3942 len - 4);
3943 addlog(">\n");
3944 }
3945 break;
3946 }
3947 if (h->ident != sp->confid[IDX_CHAP]) {
3948 if (debug)
3949 log(LOG_DEBUG,
3950 "%s: chap dropping response for old ID "
3951 "(got %d, expected %d)\n",
3952 ifp->if_xname,
3953 h->ident, sp->confid[IDX_CHAP]);
3954 break;
3955 }
3956 if (sp->hisauth.name != NULL &&
3957 (name_len != sp->hisauth.name_len
3958 || memcmp(name, sp->hisauth.name, name_len) != 0)) {
3959 log(LOG_INFO, "%s: chap response, his name ",
3960 ifp->if_xname);
3961 sppp_print_string(name, name_len);
3962 addlog(" != expected ");
3963 sppp_print_string(sp->hisauth.name,
3964 sp->hisauth.name_len);
3965 addlog("\n");
3966 goto chap_failure;
3967 }
3968 if (debug) {
3969 log(LOG_DEBUG, "%s: chap input(%s) "
3970 "<%s id=0x%x len=%d name=",
3971 ifp->if_xname,
3972 sppp_state_name(sp->state[IDX_CHAP]),
3973 sppp_auth_type_name(PPP_CHAP, h->type),
3974 h->ident, ntohs(h->len));
3975 sppp_print_string((char *)name, name_len);
3976 addlog(" value-size=%d value=", value_len);
3977 sppp_print_bytes(value, value_len);
3978 addlog(">\n");
3979 }
3980 if (value_len != sizeof(sp->myauth.challenge)) {
3981 if (debug)
3982 log(LOG_DEBUG,
3983 "%s: chap bad hash value length: "
3984 "%d bytes, should be %ld\n",
3985 ifp->if_xname, value_len,
3986 (long) sizeof(sp->myauth.challenge));
3987 goto chap_failure;
3988 }
3989
3990 MD5Init(&ctx);
3991 MD5Update(&ctx, &h->ident, 1);
3992 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len);
3993 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge));
3994 MD5Final(digest, &ctx);
3995
3996 #define FAILMSG "Failed..."
3997 #define SUCCMSG "Welcome!"
3998
3999 if (value_len != sizeof digest ||
4000 memcmp(digest, value, value_len) != 0) {
4001 chap_failure:
4002 /* action scn, tld */
4003 x = splnet();
4004 sp->pp_auth_failures++;
4005 splx(x);
4006 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4007 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG,
4008 0);
4009 chap.tld(sp);
4010 break;
4011 }
4012 sp->pp_auth_failures = 0;
4013 /* action sca, perhaps tlu */
4014 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4015 sp->state[IDX_CHAP] == STATE_OPENED)
4016 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4017 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG,
4018 0);
4019 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4020 sppp_cp_change_state(&chap, sp, STATE_OPENED);
4021 chap.tlu(sp);
4022 }
4023 break;
4024
4025 default:
4026 /* Unknown CHAP packet type -- ignore. */
4027 if (debug) {
4028 log(LOG_DEBUG, "%s: chap unknown input(%s) "
4029 "<0x%x id=0x%xh len=%d",
4030 ifp->if_xname,
4031 sppp_state_name(sp->state[IDX_CHAP]),
4032 h->type, h->ident, ntohs(h->len));
4033 if (len > 4)
4034 sppp_print_bytes((u_char *)(h + 1), len - 4);
4035 addlog(">\n");
4036 }
4037 break;
4038
4039 }
4040 }
4041
4042 static void
4043 sppp_chap_init(struct sppp *sp)
4044 {
4045 /* Chap doesn't have STATE_INITIAL at all. */
4046 sp->state[IDX_CHAP] = STATE_CLOSED;
4047 sp->fail_counter[IDX_CHAP] = 0;
4048 sp->pp_seq[IDX_CHAP] = 0;
4049 sp->pp_rseq[IDX_CHAP] = 0;
4050 callout_init(&sp->ch[IDX_CHAP]);
4051 }
4052
4053 static void
4054 sppp_chap_open(struct sppp *sp)
4055 {
4056 if (sp->myauth.proto == PPP_CHAP &&
4057 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4058 /* we are authenticator for CHAP, start it */
4059 chap.scr(sp);
4060 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4061 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4062 }
4063 /* nothing to be done if we are peer, await a challenge */
4064 }
4065
4066 static void
4067 sppp_chap_close(struct sppp *sp)
4068 {
4069 if (sp->state[IDX_CHAP] != STATE_CLOSED)
4070 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4071 }
4072
4073 static void
4074 sppp_chap_TO(void *cookie)
4075 {
4076 struct sppp *sp = (struct sppp *)cookie;
4077 STDDCL;
4078 int s;
4079
4080 s = splnet();
4081 if (debug)
4082 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n",
4083 ifp->if_xname,
4084 sppp_state_name(sp->state[IDX_CHAP]),
4085 sp->rst_counter[IDX_CHAP]);
4086
4087 if (--sp->rst_counter[IDX_CHAP] < 0)
4088 /* TO- event */
4089 switch (sp->state[IDX_CHAP]) {
4090 case STATE_REQ_SENT:
4091 chap.tld(sp);
4092 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4093 break;
4094 }
4095 else
4096 /* TO+ (or TO*) event */
4097 switch (sp->state[IDX_CHAP]) {
4098 case STATE_OPENED:
4099 /* TO* event */
4100 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4101 /* fall through */
4102 case STATE_REQ_SENT:
4103 chap.scr(sp);
4104 /* sppp_cp_change_state() will restart the timer */
4105 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4106 break;
4107 }
4108
4109 splx(s);
4110 }
4111
4112 static void
4113 sppp_chap_tlu(struct sppp *sp)
4114 {
4115 STDDCL;
4116 int i, x;
4117
4118 i = 0;
4119 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4120
4121 /*
4122 * Some broken CHAP implementations (Conware CoNet, firmware
4123 * 4.0.?) don't want to re-authenticate their CHAP once the
4124 * initial challenge-response exchange has taken place.
4125 * Provide for an option to avoid rechallenges.
4126 */
4127 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) {
4128 /*
4129 * Compute the re-challenge timeout. This will yield
4130 * a number between 300 and 810 seconds.
4131 */
4132 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7);
4133
4134 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp);
4135 }
4136
4137 if (debug) {
4138 log(LOG_DEBUG,
4139 "%s: chap %s, ",
4140 ifp->if_xname,
4141 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu");
4142 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0)
4143 addlog("next re-challenge in %d seconds\n", i);
4144 else
4145 addlog("re-challenging supressed\n");
4146 }
4147
4148 x = splnet();
4149 sp->pp_auth_failures = 0;
4150 /* indicate to LCP that we need to be closed down */
4151 sp->lcp.protos |= (1 << IDX_CHAP);
4152
4153 if (sp->pp_flags & PP_NEEDAUTH) {
4154 /*
4155 * Remote is authenticator, but his auth proto didn't
4156 * complete yet. Defer the transition to network
4157 * phase.
4158 */
4159 splx(x);
4160 return;
4161 }
4162 splx(x);
4163
4164 /*
4165 * If we are already in phase network, we are done here. This
4166 * is the case if this is a dummy tlu event after a re-challenge.
4167 */
4168 if (sp->pp_phase != SPPP_PHASE_NETWORK)
4169 sppp_phase_network(sp);
4170 }
4171
4172 static void
4173 sppp_chap_tld(struct sppp *sp)
4174 {
4175 STDDCL;
4176
4177 if (debug)
4178 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname);
4179 callout_stop(&sp->ch[IDX_CHAP]);
4180 sp->lcp.protos &= ~(1 << IDX_CHAP);
4181
4182 lcp.Close(sp);
4183 }
4184
4185 static void
4186 sppp_chap_scr(struct sppp *sp)
4187 {
4188 u_int32_t *ch;
4189 u_char clen;
4190
4191 if (sp->myauth.name == NULL) {
4192 /* can't do anything usefull */
4193 printf("%s: chap starting without my name being set\n",
4194 sp->pp_if.if_xname);
4195 return;
4196 }
4197
4198 /* Compute random challenge. */
4199 ch = (u_int32_t *)sp->myauth.challenge;
4200 ch[0] = arc4random();
4201 ch[1] = arc4random();
4202 ch[2] = arc4random();
4203 ch[3] = arc4random();
4204 clen = 16; /* 4 * sizeof(u_int32_t) */
4205
4206 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4207
4208 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4209 sizeof clen, (const char *)&clen,
4210 sizeof(sp->myauth.challenge), sp->myauth.challenge,
4211 sp->myauth.name_len,
4212 sp->myauth.name,
4213 0);
4214 }
4215
4216 /*
4217 *--------------------------------------------------------------------------*
4218 * *
4219 * The PAP implementation. *
4220 * *
4221 *--------------------------------------------------------------------------*
4222 */
4223 /*
4224 * For PAP, we need to keep a little state also if we are the peer, not the
4225 * authenticator. This is since we don't get a request to authenticate, but
4226 * have to repeatedly authenticate ourself until we got a response (or the
4227 * retry counter is expired).
4228 */
4229
4230 /*
4231 * Handle incoming PAP packets. */
4232 static void
4233 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4234 {
4235 STDDCL;
4236 struct lcp_header *h;
4237 int len, x;
4238 u_char mlen;
4239 char *name, *secret;
4240 int name_len, secret_len;
4241
4242 len = m->m_pkthdr.len;
4243 if (len < 5) {
4244 if (debug)
4245 log(LOG_DEBUG,
4246 "%s: pap invalid packet length: %d bytes\n",
4247 ifp->if_xname, len);
4248 return;
4249 }
4250 h = mtod(m, struct lcp_header *);
4251 if (len > ntohs(h->len))
4252 len = ntohs(h->len);
4253 switch (h->type) {
4254 /* PAP request is my authproto */
4255 case PAP_REQ:
4256 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) {
4257 /* can't do anything usefull */
4258 printf("%s: pap request without his name and his secret being set\n",
4259 ifp->if_xname);
4260 break;
4261 }
4262 name = 1 + (u_char *)(h + 1);
4263 name_len = name[-1];
4264 secret = name + name_len + 1;
4265 if (name_len > len - 6 ||
4266 (secret_len = secret[-1]) > len - 6 - name_len) {
4267 if (debug) {
4268 log(LOG_DEBUG, "%s: pap corrupted input "
4269 "<%s id=0x%x len=%d",
4270 ifp->if_xname,
4271 sppp_auth_type_name(PPP_PAP, h->type),
4272 h->ident, ntohs(h->len));
4273 if (len > 4)
4274 sppp_print_bytes((u_char *)(h + 1),
4275 len - 4);
4276 addlog(">\n");
4277 }
4278 break;
4279 }
4280 if (debug) {
4281 log(LOG_DEBUG, "%s: pap input(%s) "
4282 "<%s id=0x%x len=%d name=",
4283 ifp->if_xname,
4284 sppp_state_name(sp->state[IDX_PAP]),
4285 sppp_auth_type_name(PPP_PAP, h->type),
4286 h->ident, ntohs(h->len));
4287 sppp_print_string((char *)name, name_len);
4288 addlog(" secret=");
4289 sppp_print_string((char *)secret, secret_len);
4290 addlog(">\n");
4291 }
4292 if (name_len != sp->hisauth.name_len ||
4293 secret_len != sp->hisauth.secret_len ||
4294 memcmp(name, sp->hisauth.name, name_len) != 0 ||
4295 memcmp(secret, sp->hisauth.secret, secret_len) != 0) {
4296 /* action scn, tld */
4297 sp->pp_auth_failures++;
4298 mlen = sizeof(FAILMSG) - 1;
4299 sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4300 sizeof mlen, (const char *)&mlen,
4301 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG,
4302 0);
4303 pap.tld(sp);
4304 break;
4305 }
4306 /* action sca, perhaps tlu */
4307 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4308 sp->state[IDX_PAP] == STATE_OPENED) {
4309 mlen = sizeof(SUCCMSG) - 1;
4310 sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4311 sizeof mlen, (const char *)&mlen,
4312 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG,
4313 0);
4314 }
4315 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4316 sppp_cp_change_state(&pap, sp, STATE_OPENED);
4317 pap.tlu(sp);
4318 }
4319 break;
4320
4321 /* ack and nak are his authproto */
4322 case PAP_ACK:
4323 callout_stop(&sp->pap_my_to_ch);
4324 if (debug) {
4325 log(LOG_DEBUG, "%s: pap success",
4326 ifp->if_xname);
4327 name_len = *(char *)h;
4328 if (len > 5 && name_len) {
4329 addlog(": ");
4330 sppp_print_string((char *)(h + 1), name_len);
4331 }
4332 addlog("\n");
4333 }
4334 x = splnet();
4335 sp->pp_auth_failures = 0;
4336 sp->pp_flags &= ~PP_NEEDAUTH;
4337 if (sp->myauth.proto == PPP_PAP &&
4338 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4339 (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4340 /*
4341 * We are authenticator for PAP but didn't
4342 * complete yet. Leave it to tlu to proceed
4343 * to network phase.
4344 */
4345 splx(x);
4346 break;
4347 }
4348 splx(x);
4349 sppp_phase_network(sp);
4350 break;
4351
4352 case PAP_NAK:
4353 callout_stop(&sp->pap_my_to_ch);
4354 sp->pp_auth_failures++;
4355 if (debug) {
4356 log(LOG_INFO, "%s: pap failure",
4357 ifp->if_xname);
4358 name_len = *(char *)h;
4359 if (len > 5 && name_len) {
4360 addlog(": ");
4361 sppp_print_string((char *)(h + 1), name_len);
4362 }
4363 addlog("\n");
4364 } else
4365 log(LOG_INFO, "%s: pap failure\n",
4366 ifp->if_xname);
4367 /* await LCP shutdown by authenticator */
4368 break;
4369
4370 default:
4371 /* Unknown PAP packet type -- ignore. */
4372 if (debug) {
4373 log(LOG_DEBUG, "%s: pap corrupted input "
4374 "<0x%x id=0x%x len=%d",
4375 ifp->if_xname,
4376 h->type, h->ident, ntohs(h->len));
4377 if (len > 4)
4378 sppp_print_bytes((u_char *)(h + 1), len - 4);
4379 addlog(">\n");
4380 }
4381 break;
4382
4383 }
4384 }
4385
4386 static void
4387 sppp_pap_init(struct sppp *sp)
4388 {
4389 /* PAP doesn't have STATE_INITIAL at all. */
4390 sp->state[IDX_PAP] = STATE_CLOSED;
4391 sp->fail_counter[IDX_PAP] = 0;
4392 sp->pp_seq[IDX_PAP] = 0;
4393 sp->pp_rseq[IDX_PAP] = 0;
4394 callout_init(&sp->ch[IDX_PAP]);
4395 callout_init(&sp->pap_my_to_ch);
4396 }
4397
4398 static void
4399 sppp_pap_open(struct sppp *sp)
4400 {
4401 if (sp->hisauth.proto == PPP_PAP &&
4402 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4403 /* we are authenticator for PAP, start our timer */
4404 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4405 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4406 }
4407 if (sp->myauth.proto == PPP_PAP) {
4408 /* we are peer, send a request, and start a timer */
4409 pap.scr(sp);
4410 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout,
4411 sppp_pap_my_TO, sp);
4412 }
4413 }
4414
4415 static void
4416 sppp_pap_close(struct sppp *sp)
4417 {
4418 if (sp->state[IDX_PAP] != STATE_CLOSED)
4419 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4420 }
4421
4422 /*
4423 * That's the timeout routine if we are authenticator. Since the
4424 * authenticator is basically passive in PAP, we can't do much here.
4425 */
4426 static void
4427 sppp_pap_TO(void *cookie)
4428 {
4429 struct sppp *sp = (struct sppp *)cookie;
4430 STDDCL;
4431 int s;
4432
4433 s = splnet();
4434 if (debug)
4435 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n",
4436 ifp->if_xname,
4437 sppp_state_name(sp->state[IDX_PAP]),
4438 sp->rst_counter[IDX_PAP]);
4439
4440 if (--sp->rst_counter[IDX_PAP] < 0)
4441 /* TO- event */
4442 switch (sp->state[IDX_PAP]) {
4443 case STATE_REQ_SENT:
4444 pap.tld(sp);
4445 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4446 break;
4447 }
4448 else
4449 /* TO+ event, not very much we could do */
4450 switch (sp->state[IDX_PAP]) {
4451 case STATE_REQ_SENT:
4452 /* sppp_cp_change_state() will restart the timer */
4453 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4454 break;
4455 }
4456
4457 splx(s);
4458 }
4459
4460 /*
4461 * That's the timeout handler if we are peer. Since the peer is active,
4462 * we need to retransmit our PAP request since it is apparently lost.
4463 * XXX We should impose a max counter.
4464 */
4465 static void
4466 sppp_pap_my_TO(void *cookie)
4467 {
4468 struct sppp *sp = (struct sppp *)cookie;
4469 STDDCL;
4470
4471 if (debug)
4472 log(LOG_DEBUG, "%s: pap peer TO\n",
4473 ifp->if_xname);
4474
4475 pap.scr(sp);
4476 }
4477
4478 static void
4479 sppp_pap_tlu(struct sppp *sp)
4480 {
4481 STDDCL;
4482 int x;
4483
4484 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4485
4486 if (debug)
4487 log(LOG_DEBUG, "%s: %s tlu\n",
4488 ifp->if_xname, pap.name);
4489
4490 x = splnet();
4491 sp->pp_auth_failures = 0;
4492 /* indicate to LCP that we need to be closed down */
4493 sp->lcp.protos |= (1 << IDX_PAP);
4494
4495 if (sp->pp_flags & PP_NEEDAUTH) {
4496 /*
4497 * Remote is authenticator, but his auth proto didn't
4498 * complete yet. Defer the transition to network
4499 * phase.
4500 */
4501 splx(x);
4502 return;
4503 }
4504 splx(x);
4505 sppp_phase_network(sp);
4506 }
4507
4508 static void
4509 sppp_pap_tld(struct sppp *sp)
4510 {
4511 STDDCL;
4512
4513 if (debug)
4514 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname);
4515 callout_stop(&sp->ch[IDX_PAP]);
4516 callout_stop(&sp->pap_my_to_ch);
4517 sp->lcp.protos &= ~(1 << IDX_PAP);
4518
4519 lcp.Close(sp);
4520 }
4521
4522 static void
4523 sppp_pap_scr(struct sppp *sp)
4524 {
4525 u_char idlen, pwdlen;
4526
4527 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) {
4528 /* can't do anything usefull */
4529 printf("%s: pap starting without my name and secret being set\n",
4530 sp->pp_if.if_xname);
4531 return;
4532 }
4533
4534 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4535 pwdlen = sp->myauth.secret_len;
4536 idlen = sp->myauth.name_len;
4537
4538 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4539 sizeof idlen, (const char *)&idlen,
4540 idlen, sp->myauth.name,
4541 sizeof pwdlen, (const char *)&pwdlen,
4542 pwdlen, sp->myauth.secret,
4543 0);
4544 }
4545
4546 /*
4547 * Random miscellaneous functions.
4548 */
4549
4550 /*
4551 * Send a PAP or CHAP proto packet.
4552 *
4553 * Varadic function, each of the elements for the ellipsis is of type
4554 * ``size_t mlen, const u_char *msg''. Processing will stop iff
4555 * mlen == 0.
4556 * NOTE: never declare variadic functions with types subject to type
4557 * promotion (i.e. u_char). This is asking for big trouble depending
4558 * on the architecture you are on...
4559 */
4560
4561 static void
4562 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4563 unsigned int type, unsigned int id,
4564 ...)
4565 {
4566 STDDCL;
4567 struct lcp_header *lh;
4568 struct mbuf *m;
4569 u_char *p;
4570 int len;
4571 size_t pkthdrlen;
4572 unsigned int mlen;
4573 const char *msg;
4574 va_list ap;
4575
4576 MGETHDR(m, M_DONTWAIT, MT_DATA);
4577 if (! m)
4578 return;
4579 m->m_pkthdr.rcvif = 0;
4580
4581 if (sp->pp_flags & PP_NOFRAMING) {
4582 *mtod(m, u_int16_t *) = htons(cp->proto);
4583 pkthdrlen = 2;
4584 lh = (struct lcp_header *)(mtod(m, u_int8_t *)+2);
4585 } else {
4586 struct ppp_header *h;
4587 h = mtod(m, struct ppp_header *);
4588 h->address = PPP_ALLSTATIONS; /* broadcast address */
4589 h->control = PPP_UI; /* Unnumbered Info */
4590 h->protocol = htons(cp->proto);
4591 pkthdrlen = PPP_HEADER_LEN;
4592
4593 lh = (struct lcp_header *)(h + 1);
4594 }
4595
4596 lh->type = type;
4597 lh->ident = id;
4598 p = (u_char *)(lh + 1);
4599
4600 va_start(ap, id);
4601 len = 0;
4602
4603 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
4604 msg = va_arg(ap, const char *);
4605 len += mlen;
4606 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) {
4607 va_end(ap);
4608 m_freem(m);
4609 return;
4610 }
4611
4612 bcopy(msg, p, mlen);
4613 p += mlen;
4614 }
4615 va_end(ap);
4616
4617 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len;
4618 lh->len = htons(LCP_HEADER_LEN + len);
4619
4620 if (debug) {
4621 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d",
4622 ifp->if_xname, cp->name,
4623 sppp_auth_type_name(cp->proto, lh->type),
4624 lh->ident, ntohs(lh->len));
4625 if (len)
4626 sppp_print_bytes((u_char *)(lh + 1), len);
4627 addlog(">\n");
4628 }
4629 if (IF_QFULL(&sp->pp_cpq)) {
4630 IF_DROP(&sp->pp_fastq);
4631 IF_DROP(&ifp->if_snd);
4632 m_freem(m);
4633 ++ifp->if_oerrors;
4634 return;
4635 } else
4636 IF_ENQUEUE(&sp->pp_cpq, m);
4637 if (! (ifp->if_flags & IFF_OACTIVE))
4638 (*ifp->if_start)(ifp);
4639 ifp->if_obytes += m->m_pkthdr.len + 3;
4640 }
4641
4642 /*
4643 * Send keepalive packets, every 10 seconds.
4644 */
4645 static void
4646 sppp_keepalive(void *dummy)
4647 {
4648 struct sppp *sp;
4649 int s;
4650 time_t now;
4651
4652 s = splnet();
4653 now = time_uptime;
4654 for (sp=spppq; sp; sp=sp->pp_next) {
4655 struct ifnet *ifp = &sp->pp_if;
4656
4657 /* check idle timeout */
4658 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING)
4659 && (sp->pp_phase == SPPP_PHASE_NETWORK)) {
4660 /* idle timeout is enabled for this interface */
4661 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) {
4662 if (ifp->if_flags & IFF_DEBUG)
4663 printf("%s: no activity for %lu seconds\n",
4664 sp->pp_if.if_xname,
4665 (unsigned long)(now-sp->pp_last_activity));
4666 lcp.Close(sp);
4667 continue;
4668 }
4669 }
4670
4671 /* Keepalive mode disabled or channel down? */
4672 if (! (sp->pp_flags & PP_KEEPALIVE) ||
4673 ! (ifp->if_flags & IFF_RUNNING))
4674 continue;
4675
4676 /* No keepalive in PPP mode if LCP not opened yet. */
4677 if (! (sp->pp_flags & PP_CISCO) &&
4678 sp->pp_phase < SPPP_PHASE_AUTHENTICATE)
4679 continue;
4680
4681 /* No echo reply, but maybe user data passed through? */
4682 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) {
4683 sp->pp_alivecnt = 0;
4684 continue;
4685 }
4686
4687 if (sp->pp_alivecnt >= sp->pp_maxalive) {
4688 /* No keepalive packets got. Stop the interface. */
4689 if_down (ifp);
4690 IF_PURGE(&sp->pp_cpq);
4691 if (! (sp->pp_flags & PP_CISCO)) {
4692 printf("%s: LCP keepalive timed out, going to restart the connection\n",
4693 ifp->if_xname);
4694 sp->pp_alivecnt = 0;
4695
4696 /* we are down, close all open protocols */
4697 lcp.Close(sp);
4698
4699 /* And now prepare LCP to reestablish the link, if configured to do so. */
4700 sppp_cp_change_state(&lcp, sp, STATE_STOPPED);
4701
4702 /* Close connection imediatly, completition of this
4703 * will summon the magic needed to reestablish it. */
4704 if (sp->pp_tlf)
4705 sp->pp_tlf(sp);
4706 continue;
4707 }
4708 }
4709 if (sp->pp_alivecnt < sp->pp_maxalive)
4710 ++sp->pp_alivecnt;
4711 if (sp->pp_flags & PP_CISCO)
4712 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ,
4713 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4714 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) {
4715 int32_t nmagic = htonl(sp->lcp.magic);
4716 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4717 sppp_cp_send(sp, PPP_LCP, ECHO_REQ,
4718 sp->lcp.echoid, 4, &nmagic);
4719 }
4720 }
4721 splx(s);
4722 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL);
4723 }
4724
4725 #ifdef INET
4726 /*
4727 * Get both IP addresses.
4728 */
4729 static void
4730 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask)
4731 {
4732 struct ifnet *ifp = &sp->pp_if;
4733 struct ifaddr *ifa;
4734 struct sockaddr_in *si, *sm;
4735 u_int32_t ssrc, ddst;
4736
4737 sm = NULL;
4738 ssrc = ddst = 0;
4739 /*
4740 * Pick the first AF_INET address from the list,
4741 * aliases don't make any sense on a p2p link anyway.
4742 */
4743 si = 0;
4744 IFADDR_FOREACH(ifa, ifp) {
4745 if (ifa->ifa_addr->sa_family == AF_INET) {
4746 si = (struct sockaddr_in *)ifa->ifa_addr;
4747 sm = (struct sockaddr_in *)ifa->ifa_netmask;
4748 if (si)
4749 break;
4750 }
4751 }
4752 if (ifa) {
4753 if (si && si->sin_addr.s_addr) {
4754 ssrc = si->sin_addr.s_addr;
4755 if (srcmask)
4756 *srcmask = ntohl(sm->sin_addr.s_addr);
4757 }
4758
4759 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4760 if (si && si->sin_addr.s_addr)
4761 ddst = si->sin_addr.s_addr;
4762 }
4763
4764 if (dst) *dst = ntohl(ddst);
4765 if (src) *src = ntohl(ssrc);
4766 }
4767
4768 /*
4769 * Set IP addresses. Must be called at splnet.
4770 * If an address is 0, leave it the way it is.
4771 */
4772 static void
4773 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr)
4774 {
4775 STDDCL;
4776 struct ifaddr *ifa;
4777 struct sockaddr_in *si, *dest;
4778
4779 /*
4780 * Pick the first AF_INET address from the list,
4781 * aliases don't make any sense on a p2p link anyway.
4782 */
4783
4784 IFADDR_FOREACH(ifa, ifp) {
4785 if (ifa->ifa_addr->sa_family == AF_INET) {
4786 si = (struct sockaddr_in *)ifa->ifa_addr;
4787 dest = (struct sockaddr_in *)ifa->ifa_dstaddr;
4788 goto found;
4789 }
4790 }
4791 return;
4792
4793 found:
4794 {
4795 int error;
4796 struct sockaddr_in new_sin = *si;
4797 struct sockaddr_in new_dst = *dest;
4798
4799 /*
4800 * Scrub old routes now instead of calling in_ifinit with
4801 * scrub=1, because we may change the dstaddr
4802 * before the call to in_ifinit.
4803 */
4804 in_ifscrub(ifp, ifatoia(ifa));
4805
4806 if (myaddr != 0)
4807 new_sin.sin_addr.s_addr = htonl(myaddr);
4808 if (hisaddr != 0) {
4809 new_dst.sin_addr.s_addr = htonl(hisaddr);
4810 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) {
4811 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr;
4812 *dest = new_dst; /* fix dstaddr in place */
4813 }
4814 }
4815 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0);
4816 if (debug && error)
4817 {
4818 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit "
4819 " failed, error=%d\n", ifp->if_xname, error);
4820 }
4821 #ifdef PFIL_HOOKS
4822 if (!error)
4823 (void)pfil_run_hooks(&if_pfil,
4824 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR);
4825 #endif
4826 }
4827 }
4828
4829 /*
4830 * Clear IP addresses. Must be called at splnet.
4831 */
4832 static void
4833 sppp_clear_ip_addrs(struct sppp *sp)
4834 {
4835 struct ifnet *ifp = &sp->pp_if;
4836 struct ifaddr *ifa;
4837 struct sockaddr_in *si, *dest;
4838
4839 u_int32_t remote;
4840 if (sp->ipcp.flags & IPCP_HISADDR_DYN)
4841 remote = sp->ipcp.saved_hisaddr;
4842 else
4843 sppp_get_ip_addrs(sp, 0, &remote, 0);
4844
4845 /*
4846 * Pick the first AF_INET address from the list,
4847 * aliases don't make any sense on a p2p link anyway.
4848 */
4849
4850 IFADDR_FOREACH(ifa, ifp) {
4851 if (ifa->ifa_addr->sa_family == AF_INET) {
4852 si = (struct sockaddr_in *)ifa->ifa_addr;
4853 dest = (struct sockaddr_in *)ifa->ifa_dstaddr;
4854 goto found;
4855 }
4856 }
4857 return;
4858
4859 found:
4860 {
4861 struct sockaddr_in new_sin = *si;
4862
4863 in_ifscrub(ifp, ifatoia(ifa));
4864 if (sp->ipcp.flags & IPCP_MYADDR_DYN)
4865 new_sin.sin_addr.s_addr = 0;
4866 if (sp->ipcp.flags & IPCP_HISADDR_DYN)
4867 /* replace peer addr in place */
4868 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr;
4869 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0);
4870 #ifdef PFIL_HOOKS
4871 (void)pfil_run_hooks(&if_pfil,
4872 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR);
4873 #endif
4874 }
4875 }
4876 #endif
4877
4878 #ifdef INET6
4879 /*
4880 * Get both IPv6 addresses.
4881 */
4882 static void
4883 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4884 struct in6_addr *srcmask)
4885 {
4886 struct ifnet *ifp = &sp->pp_if;
4887 struct ifaddr *ifa;
4888 struct sockaddr_in6 *si, *sm;
4889 struct in6_addr ssrc, ddst;
4890
4891 sm = NULL;
4892 memset(&ssrc, 0, sizeof(ssrc));
4893 memset(&ddst, 0, sizeof(ddst));
4894 /*
4895 * Pick the first link-local AF_INET6 address from the list,
4896 * aliases don't make any sense on a p2p link anyway.
4897 */
4898 si = 0;
4899 IFADDR_FOREACH(ifa, ifp)
4900 if (ifa->ifa_addr->sa_family == AF_INET6) {
4901 si = (struct sockaddr_in6 *)ifa->ifa_addr;
4902 sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4903 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4904 break;
4905 }
4906 if (ifa) {
4907 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4908 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4909 if (srcmask) {
4910 bcopy(&sm->sin6_addr, srcmask,
4911 sizeof(*srcmask));
4912 }
4913 }
4914
4915 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
4916 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
4917 bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
4918 }
4919
4920 if (dst)
4921 bcopy(&ddst, dst, sizeof(*dst));
4922 if (src)
4923 bcopy(&ssrc, src, sizeof(*src));
4924 }
4925
4926 #ifdef IPV6CP_MYIFID_DYN
4927 /*
4928 * Generate random ifid.
4929 */
4930 static void
4931 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
4932 {
4933 /* TBD */
4934 }
4935
4936 /*
4937 * Set my IPv6 address. Must be called at splnet.
4938 */
4939 static void
4940 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
4941 {
4942 STDDCL;
4943 struct ifaddr *ifa;
4944 struct sockaddr_in6 *sin6;
4945
4946 /*
4947 * Pick the first link-local AF_INET6 address from the list,
4948 * aliases don't make any sense on a p2p link anyway.
4949 */
4950
4951 sin6 = NULL;
4952 IFADDR_FOREACH(ifa, ifp)
4953 {
4954 if (ifa->ifa_addr->sa_family == AF_INET6)
4955 {
4956 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
4957 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
4958 break;
4959 }
4960 }
4961
4962 if (ifa && sin6)
4963 {
4964 int error;
4965 struct sockaddr_in6 new_sin6 = *sin6;
4966
4967 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
4968 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
4969 if (debug && error)
4970 {
4971 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit "
4972 " failed, error=%d\n", ifp->if_xname, error);
4973 }
4974 #ifdef PFIL_HOOKS
4975 if (!error)
4976 (void)pfil_run_hooks(&if_pfil,
4977 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR);
4978 #endif
4979 }
4980 }
4981 #endif
4982
4983 /*
4984 * Suggest a candidate address to be used by peer.
4985 */
4986 static void
4987 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
4988 {
4989 struct in6_addr myaddr;
4990 struct timeval tv;
4991
4992 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
4993
4994 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */
4995 microtime(&tv);
4996 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
4997 myaddr.s6_addr[14] ^= 0xff;
4998 myaddr.s6_addr[15] ^= 0xff;
4999 } else {
5000 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5001 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5002 }
5003 if (suggest)
5004 bcopy(&myaddr, suggest, sizeof(myaddr));
5005 }
5006 #endif /*INET6*/
5007
5008 /*
5009 * Process ioctl requests specific to the PPP interface.
5010 * Permissions have already been checked.
5011 */
5012 static int
5013 sppp_params(struct sppp *sp, int cmd, void *data)
5014 {
5015 switch (cmd) {
5016 case SPPPGETAUTHCFG:
5017 {
5018 struct spppauthcfg *cfg = (struct spppauthcfg *)data;
5019 int error;
5020 size_t len;
5021
5022 cfg->myauthflags = sp->myauth.flags;
5023 cfg->hisauthflags = sp->hisauth.flags;
5024 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ);
5025 cfg->hisauth = 0;
5026 if (sp->hisauth.proto)
5027 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP;
5028 cfg->myauth = 0;
5029 if (sp->myauth.proto)
5030 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP;
5031 if (cfg->myname_length == 0) {
5032 if (sp->myauth.name != NULL)
5033 cfg->myname_length = sp->myauth.name_len + 1;
5034 } else {
5035 if (sp->myauth.name == NULL) {
5036 cfg->myname_length = 0;
5037 } else {
5038 len = sp->myauth.name_len + 1;
5039 if (cfg->myname_length < len)
5040 return (ENAMETOOLONG);
5041 error = copyout(sp->myauth.name, cfg->myname, len);
5042 if (error) return error;
5043 }
5044 }
5045 if (cfg->hisname_length == 0) {
5046 if (sp->hisauth.name != NULL)
5047 cfg->hisname_length = sp->hisauth.name_len + 1;
5048 } else {
5049 if (sp->hisauth.name == NULL) {
5050 cfg->hisname_length = 0;
5051 } else {
5052 len = sp->hisauth.name_len + 1;
5053 if (cfg->hisname_length < len)
5054 return (ENAMETOOLONG);
5055 error = copyout(sp->hisauth.name, cfg->hisname, len);
5056 if (error) return error;
5057 }
5058 }
5059 }
5060 break;
5061 case SPPPSETAUTHCFG:
5062 {
5063 struct spppauthcfg *cfg = (struct spppauthcfg *)data;
5064 int error;
5065
5066 if (sp->myauth.name) {
5067 free(sp->myauth.name, M_DEVBUF);
5068 sp->myauth.name = NULL;
5069 }
5070 if (sp->myauth.secret) {
5071 free(sp->myauth.secret, M_DEVBUF);
5072 sp->myauth.secret = NULL;
5073 }
5074 if (sp->hisauth.name) {
5075 free(sp->hisauth.name, M_DEVBUF);
5076 sp->hisauth.name = NULL;
5077 }
5078 if (sp->hisauth.secret) {
5079 free(sp->hisauth.secret, M_DEVBUF);
5080 sp->hisauth.secret = NULL;
5081 }
5082
5083 if (cfg->hisname != NULL && cfg->hisname_length > 0) {
5084 if (cfg->hisname_length >= MCLBYTES)
5085 return (ENAMETOOLONG);
5086 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK);
5087 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length);
5088 if (error) {
5089 free(sp->hisauth.name, M_DEVBUF);
5090 sp->hisauth.name = NULL;
5091 return error;
5092 }
5093 sp->hisauth.name_len = cfg->hisname_length - 1;
5094 sp->hisauth.name[sp->hisauth.name_len] = 0;
5095 }
5096 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) {
5097 if (cfg->hissecret_length >= MCLBYTES)
5098 return (ENAMETOOLONG);
5099 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK);
5100 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length);
5101 if (error) {
5102 free(sp->hisauth.secret, M_DEVBUF);
5103 sp->hisauth.secret = NULL;
5104 return error;
5105 }
5106 sp->hisauth.secret_len = cfg->hissecret_length - 1;
5107 sp->hisauth.secret[sp->hisauth.secret_len] = 0;
5108 }
5109 if (cfg->myname != NULL && cfg->myname_length > 0) {
5110 if (cfg->myname_length >= MCLBYTES)
5111 return (ENAMETOOLONG);
5112 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK);
5113 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length);
5114 if (error) {
5115 free(sp->myauth.name, M_DEVBUF);
5116 sp->myauth.name = NULL;
5117 return error;
5118 }
5119 sp->myauth.name_len = cfg->myname_length - 1;
5120 sp->myauth.name[sp->myauth.name_len] = 0;
5121 }
5122 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) {
5123 if (cfg->mysecret_length >= MCLBYTES)
5124 return (ENAMETOOLONG);
5125 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK);
5126 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length);
5127 if (error) {
5128 free(sp->myauth.secret, M_DEVBUF);
5129 sp->myauth.secret = NULL;
5130 return error;
5131 }
5132 sp->myauth.secret_len = cfg->mysecret_length - 1;
5133 sp->myauth.secret[sp->myauth.secret_len] = 0;
5134 }
5135 sp->myauth.flags = cfg->myauthflags;
5136 if (cfg->myauth)
5137 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP;
5138 sp->hisauth.flags = cfg->hisauthflags;
5139 if (cfg->hisauth)
5140 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP;
5141 sp->pp_auth_failures = 0;
5142 if (sp->hisauth.proto != 0)
5143 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
5144 else
5145 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
5146 }
5147 break;
5148 case SPPPGETLCPCFG:
5149 {
5150 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data;
5151 lcpp->lcp_timeout = sp->lcp.timeout;
5152 }
5153 break;
5154 case SPPPSETLCPCFG:
5155 {
5156 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data;
5157 sp->lcp.timeout = lcpp->lcp_timeout;
5158 }
5159 break;
5160 case SPPPGETSTATUS:
5161 {
5162 struct spppstatus *status = (struct spppstatus *)data;
5163 status->phase = sp->pp_phase;
5164 }
5165 break;
5166 case SPPPGETSTATUSNCP:
5167 {
5168 struct spppstatusncp *status = (struct spppstatusncp *)data;
5169 status->phase = sp->pp_phase;
5170 status->ncpup = sppp_ncp_check(sp);
5171 }
5172 break;
5173 case SPPPGETIDLETO:
5174 {
5175 struct spppidletimeout *to = (struct spppidletimeout *)data;
5176 to->idle_seconds = sp->pp_idle_timeout;
5177 }
5178 break;
5179 case SPPPSETIDLETO:
5180 {
5181 struct spppidletimeout *to = (struct spppidletimeout *)data;
5182 sp->pp_idle_timeout = to->idle_seconds;
5183 }
5184 break;
5185 case SPPPSETAUTHFAILURE:
5186 {
5187 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data;
5188 sp->pp_max_auth_fail = afsettings->max_failures;
5189 sp->pp_auth_failures = 0;
5190 }
5191 break;
5192 case SPPPGETAUTHFAILURES:
5193 {
5194 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data;
5195 stats->auth_failures = sp->pp_auth_failures;
5196 stats->max_failures = sp->pp_max_auth_fail;
5197 }
5198 break;
5199 case SPPPSETDNSOPTS:
5200 {
5201 struct spppdnssettings *req = (struct spppdnssettings *)data;
5202 sp->query_dns = req->query_dns & 3;
5203 }
5204 break;
5205 case SPPPGETDNSOPTS:
5206 {
5207 struct spppdnssettings *req = (struct spppdnssettings *)data;
5208 req->query_dns = sp->query_dns;
5209 }
5210 break;
5211 case SPPPGETDNSADDRS:
5212 {
5213 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data;
5214 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns);
5215 }
5216 break;
5217 case SPPPGETKEEPALIVE:
5218 {
5219 struct spppkeepalivesettings *settings =
5220 (struct spppkeepalivesettings*)data;
5221 settings->maxalive = sp->pp_maxalive;
5222 settings->max_noreceive = sp->pp_max_noreceive;
5223 }
5224 break;
5225 case SPPPSETKEEPALIVE:
5226 {
5227 struct spppkeepalivesettings *settings =
5228 (struct spppkeepalivesettings*)data;
5229 sp->pp_maxalive = settings->maxalive;
5230 sp->pp_max_noreceive = settings->max_noreceive;
5231 }
5232 break;
5233 default:
5234 return (EINVAL);
5235 }
5236
5237 return (0);
5238 }
5239
5240 static void
5241 sppp_phase_network(struct sppp *sp)
5242 {
5243 STDDCL;
5244 int i;
5245 u_int32_t mask;
5246
5247 sp->pp_phase = SPPP_PHASE_NETWORK;
5248
5249 if (debug)
5250 {
5251 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname,
5252 sppp_phase_name(sp->pp_phase));
5253 }
5254
5255 /* Notify NCPs now. */
5256 for (i = 0; i < IDX_COUNT; i++)
5257 if ((cps[i])->flags & CP_NCP)
5258 (cps[i])->Open(sp);
5259
5260 /* Send Up events to all NCPs. */
5261 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5262 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5263 (cps[i])->Up(sp);
5264
5265 /* if no NCP is starting, all this was in vain, close down */
5266 sppp_lcp_check_and_close(sp);
5267 }
5268
5269
5270 static const char *
5271 sppp_cp_type_name(u_char type)
5272 {
5273 static char buf[12];
5274 switch (type) {
5275 case CONF_REQ: return "conf-req";
5276 case CONF_ACK: return "conf-ack";
5277 case CONF_NAK: return "conf-nak";
5278 case CONF_REJ: return "conf-rej";
5279 case TERM_REQ: return "term-req";
5280 case TERM_ACK: return "term-ack";
5281 case CODE_REJ: return "code-rej";
5282 case PROTO_REJ: return "proto-rej";
5283 case ECHO_REQ: return "echo-req";
5284 case ECHO_REPLY: return "echo-reply";
5285 case DISC_REQ: return "discard-req";
5286 }
5287 snprintf(buf, sizeof(buf), "0x%x", type);
5288 return buf;
5289 }
5290
5291 static const char *
5292 sppp_auth_type_name(u_short proto, u_char type)
5293 {
5294 static char buf[12];
5295 switch (proto) {
5296 case PPP_CHAP:
5297 switch (type) {
5298 case CHAP_CHALLENGE: return "challenge";
5299 case CHAP_RESPONSE: return "response";
5300 case CHAP_SUCCESS: return "success";
5301 case CHAP_FAILURE: return "failure";
5302 }
5303 case PPP_PAP:
5304 switch (type) {
5305 case PAP_REQ: return "req";
5306 case PAP_ACK: return "ack";
5307 case PAP_NAK: return "nak";
5308 }
5309 }
5310 snprintf(buf, sizeof(buf), "0x%x", type);
5311 return buf;
5312 }
5313
5314 static const char *
5315 sppp_lcp_opt_name(u_char opt)
5316 {
5317 static char buf[12];
5318 switch (opt) {
5319 case LCP_OPT_MRU: return "mru";
5320 case LCP_OPT_ASYNC_MAP: return "async-map";
5321 case LCP_OPT_AUTH_PROTO: return "auth-proto";
5322 case LCP_OPT_QUAL_PROTO: return "qual-proto";
5323 case LCP_OPT_MAGIC: return "magic";
5324 case LCP_OPT_PROTO_COMP: return "proto-comp";
5325 case LCP_OPT_ADDR_COMP: return "addr-comp";
5326 }
5327 snprintf(buf, sizeof(buf), "0x%x", opt);
5328 return buf;
5329 }
5330
5331 static const char *
5332 sppp_ipcp_opt_name(u_char opt)
5333 {
5334 static char buf[12];
5335 switch (opt) {
5336 case IPCP_OPT_ADDRESSES: return "addresses";
5337 case IPCP_OPT_COMPRESSION: return "compression";
5338 case IPCP_OPT_ADDRESS: return "address";
5339 }
5340 snprintf(buf, sizeof(buf), "0x%x", opt);
5341 return buf;
5342 }
5343
5344 #ifdef INET6
5345 static const char *
5346 sppp_ipv6cp_opt_name(u_char opt)
5347 {
5348 static char buf[12];
5349 switch (opt) {
5350 case IPV6CP_OPT_IFID: return "ifid";
5351 case IPV6CP_OPT_COMPRESSION: return "compression";
5352 }
5353 snprintf(buf, sizeof(buf), "0x%x", opt);
5354 return buf;
5355 }
5356 #endif
5357
5358 static const char *
5359 sppp_state_name(int state)
5360 {
5361 switch (state) {
5362 case STATE_INITIAL: return "initial";
5363 case STATE_STARTING: return "starting";
5364 case STATE_CLOSED: return "closed";
5365 case STATE_STOPPED: return "stopped";
5366 case STATE_CLOSING: return "closing";
5367 case STATE_STOPPING: return "stopping";
5368 case STATE_REQ_SENT: return "req-sent";
5369 case STATE_ACK_RCVD: return "ack-rcvd";
5370 case STATE_ACK_SENT: return "ack-sent";
5371 case STATE_OPENED: return "opened";
5372 }
5373 return "illegal";
5374 }
5375
5376 static const char *
5377 sppp_phase_name(int phase)
5378 {
5379 switch (phase) {
5380 case SPPP_PHASE_DEAD: return "dead";
5381 case SPPP_PHASE_ESTABLISH: return "establish";
5382 case SPPP_PHASE_TERMINATE: return "terminate";
5383 case SPPP_PHASE_AUTHENTICATE: return "authenticate";
5384 case SPPP_PHASE_NETWORK: return "network";
5385 }
5386 return "illegal";
5387 }
5388
5389 static const char *
5390 sppp_proto_name(u_short proto)
5391 {
5392 static char buf[12];
5393 switch (proto) {
5394 case PPP_LCP: return "lcp";
5395 case PPP_IPCP: return "ipcp";
5396 case PPP_PAP: return "pap";
5397 case PPP_CHAP: return "chap";
5398 case PPP_IPV6CP: return "ipv6cp";
5399 }
5400 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto);
5401 return buf;
5402 }
5403
5404 static void
5405 sppp_print_bytes(const u_char *p, u_short len)
5406 {
5407 addlog(" %02x", *p++);
5408 while (--len > 0)
5409 addlog("-%02x", *p++);
5410 }
5411
5412 static void
5413 sppp_print_string(const char *p, u_short len)
5414 {
5415 u_char c;
5416
5417 while (len-- > 0) {
5418 c = *p++;
5419 /*
5420 * Print only ASCII chars directly. RFC 1994 recommends
5421 * using only them, but we don't rely on it. */
5422 if (c < ' ' || c > '~')
5423 addlog("\\x%x", c);
5424 else
5425 addlog("%c", c);
5426 }
5427 }
5428
5429 static const char *
5430 sppp_dotted_quad(u_int32_t addr)
5431 {
5432 static char s[16];
5433 snprintf(s, sizeof(s), "%d.%d.%d.%d",
5434 (int)((addr >> 24) & 0xff),
5435 (int)((addr >> 16) & 0xff),
5436 (int)((addr >> 8) & 0xff),
5437 (int)(addr & 0xff));
5438 return s;
5439 }
5440
5441 /* a dummy, used to drop uninteresting events */
5442 static void
5443 sppp_null(struct sppp *unused)
5444 {
5445 /* do just nothing */
5446 }
5447 /*
5448 * This file is large. Tell emacs to highlight it nevertheless.
5449 *
5450 * Local Variables:
5451 * hilit-auto-highlight-maxout: 120000
5452 * End:
5453 */
5454