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(somewhat unrelated cleanups, but all are very minor)
[mirror_frr.git] / isisd / isis_pdu.c
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eb5d44eb 1/*
2 * IS-IS Rout(e)ing protocol - isis_pdu.c
3 * PDU processing
4 *
5 * Copyright (C) 2001,2002 Sampo Saaristo
6 * Tampere University of Technology
7 * Institute of Communications Engineering
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public Licenseas published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 * This program is distributed in the hope that it will be useful,but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 * more details.
18
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23
24#include <stdio.h>
25#include <string.h>
26#include <zebra.h>
eb5d44eb 27
28#include "memory.h"
29#include "thread.h"
30#include "linklist.h"
31#include "log.h"
32#include "stream.h"
33#include "vty.h"
34#include "hash.c"
35#include "prefix.h"
36#include "if.h"
37
38#include "isisd/dict.h"
39#include "isisd/include-netbsd/iso.h"
40#include "isisd/isis_constants.h"
41#include "isisd/isis_common.h"
42#include "isisd/isis_adjacency.h"
43#include "isisd/isis_circuit.h"
44#include "isisd/isis_network.h"
45#include "isisd/isis_misc.h"
46#include "isisd/isis_dr.h"
47#include "isisd/isis_flags.h"
48#include "isisd/isis_tlv.h"
49#include "isisd/isisd.h"
50#include "isisd/isis_dynhn.h"
51#include "isisd/isis_lsp.h"
52#include "isisd/isis_pdu.h"
53#include "isisd/iso_checksum.h"
54#include "isisd/isis_csm.h"
55#include "isisd/isis_events.h"
56
57extern struct thread_master *master;
58extern struct isis *isis;
59
60#define ISIS_MINIMUM_FIXED_HDR_LEN 15
61#define ISIS_MIN_PDU_LEN 13 /* partial seqnum pdu with id_len=2 */
62
63#ifndef PNBBY
64#define PNBBY 8
65#endif /* PNBBY */
66
67/* Utility mask array. */
68static u_char maskbit[] =
69{
70 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
71};
72
73/*
74 * HELPER FUNCS
75 */
76
77/*
78 * Compares two sets of area addresses
79 */
80static int
81area_match (struct list *left, struct list *right)
82{
83 struct area_addr *addr1, *addr2;
84 struct listnode *node1, *node2;
85
86 LIST_LOOP (left, addr1, node1) {
87 LIST_LOOP (right, addr2, node2) {
88 if (addr1->addr_len == addr2->addr_len &&
89 !memcmp (addr1->area_addr, addr2->area_addr, (int)addr1->addr_len))
90 return 1; /* match */
91 }
92 }
93
94 return 0; /* mismatch */
95}
96
97/*
98 * Check if ip2 is in the ip1's network (function like Prefix.h:prefix_match() )
99 * param ip1 the IS interface ip address structure
100 * param ip2 the IIH's ip address
101 * return 0 the IIH's IP is not in the IS's subnetwork
102 * 1 the IIH's IP is in the IS's subnetwork
103 */
104int
105ip_same_subnet (struct prefix_ipv4 *ip1, struct in_addr *ip2)
106{
107 u_char *addr1, *addr2;
108 int shift, offset;
109 int len;
110
111 addr1 = (u_char *) &ip1->prefix.s_addr;
112 addr2 = (u_char *) &ip2->s_addr;
113 len = ip1->prefixlen;
114
115 shift = len % PNBBY;
116 offset = len / PNBBY;
117
118 while (offset--) {
119 if (addr1[offset] != addr2[offset]) {
120 return 0;
121 }
122 }
123
124 if (shift) {
125 if (maskbit[shift] & (addr1[offset] ^ addr2[offset])) {
126 return 0;
127 }
128 }
129
130 return 1; /* match */
131}
132
133
134/*
135 * Compares two set of ip addresses
136 * param left the local interface's ip addresses
137 * param right the iih interface's ip address
138 * return 0 no match;
139 * 1 match;
140 */
141static int
142ip_match (struct list *left, struct list *right)
143{
144 struct prefix_ipv4 *ip1;
145 struct in_addr *ip2;
146 struct listnode *node1, *node2;
147
148 LIST_LOOP (left, ip1, node1) {
149 LIST_LOOP (right, ip2, node2) {
150 if (ip_same_subnet(ip1, ip2)) {
151 return 1; /* match */
152 }
153 }
154
155 }
156 return 0;
157}
158
159/*
160 * Checks whether we should accept a PDU of given level
161 */
162static int
163accept_level (int level, int circuit_t)
164{
165 int retval = ((circuit_t & level) == level); /* simple approach */
166
167 return retval;
168}
169
170int
171authentication_check (struct isis_passwd *one, struct isis_passwd *theother)
172{
173 if (one->type != theother->type) {
174 zlog_warn ("Unsupported authentication type %d", theother->type );
175 return 1; /* Auth fail (different authentication types)*/
176 }
177 switch (one->type) {
178 case ISIS_PASSWD_TYPE_CLEARTXT:
179 if (one->len != theother->len)
180 return 1; /* Auth fail () - passwd len mismatch */
181 return memcmp (one->passwd, theother->passwd, one->len);
182 break;
183 default:
184 zlog_warn ("Unsupported authentication type");
185 break;
186 }
187 return 0; /* Auth pass */
188}
189
190/*
191 * Processing helper functions
192 */
193void
194tlvs_to_adj_nlpids (struct tlvs *tlvs, struct isis_adjacency *adj)
195{
196 int i;
197 struct nlpids *tlv_nlpids;
198
199 if (tlvs->nlpids) {
200
201 tlv_nlpids = tlvs->nlpids;
202
203 adj->nlpids.count = tlv_nlpids->count;
204
205 for (i=0;i<tlv_nlpids->count;i++) {
206 adj->nlpids.nlpids[i] = tlv_nlpids->nlpids[i];
207 }
208 }
209}
210
211void
212del_ip_addr (void *val)
213{
214 XFREE (MTYPE_ISIS_TMP, val);
215}
216
217void
218tlvs_to_adj_ipv4_addrs (struct tlvs *tlvs, struct isis_adjacency *adj)
219{
220 struct listnode *node;
221 struct in_addr *ipv4_addr, *malloced;
222
223 if (adj->ipv4_addrs) {
224 adj->ipv4_addrs->del = del_ip_addr;
225 list_delete (adj->ipv4_addrs);
226 }
227 adj->ipv4_addrs = list_new ();
228 if (tlvs->ipv4_addrs) {
229 LIST_LOOP (tlvs->ipv4_addrs, ipv4_addr, node) {
230 malloced = XMALLOC (MTYPE_ISIS_TMP, sizeof (struct in_addr));
231 memcpy (malloced, ipv4_addr, sizeof (struct in_addr));
232 listnode_add (adj->ipv4_addrs, malloced);
233 }
234 }
235}
236
237#ifdef HAVE_IPV6
238void
239tlvs_to_adj_ipv6_addrs (struct tlvs *tlvs, struct isis_adjacency *adj)
240{
241 struct listnode *node;
242 struct in6_addr *ipv6_addr, *malloced;
243
244 if (adj->ipv6_addrs) {
245 adj->ipv6_addrs->del = del_ip_addr;
246 list_delete (adj->ipv6_addrs);
247 }
248 adj->ipv6_addrs = list_new ();
249 if (tlvs->ipv6_addrs) {
250 LIST_LOOP (tlvs->ipv6_addrs, ipv6_addr, node) {
251 malloced = XMALLOC (MTYPE_ISIS_TMP, sizeof (struct in6_addr));
252 memcpy (malloced, ipv6_addr, sizeof (struct in6_addr));
253 listnode_add (adj->ipv6_addrs, malloced);
254 }
255 }
256
257}
258#endif /* HAVE_IPV6 */
259
260
261
262/*
263 * RECEIVE SIDE
264 */
265
266/*
267 * Process P2P IIH
268 * ISO - 10589
269 * Section 8.2.5 - Receiving point-to-point IIH PDUs
270 *
271 */
272static int
273process_p2p_hello (struct isis_circuit *circuit)
274{
275 int retval = ISIS_OK;
276 struct isis_p2p_hello_hdr *hdr;
277 struct isis_adjacency *adj;
278 u_int32_t expected = 0, found;
279 struct tlvs tlvs;
280
281 if ((stream_get_endp (circuit->rcv_stream) -
282 stream_get_getp (circuit->rcv_stream)) <
283 ISIS_P2PHELLO_HDRLEN) {
284 zlog_warn ("Packet too short");
285 return ISIS_WARNING;
286 }
287
288 /* 8.2.5.1 PDU acceptance tests */
289
290 /* 8.2.5.1 a) external domain untrue */
291 /* FIXME: not useful at all? */
292
293 /* 8.2.5.1 b) ID Length mismatch */
294 /* checked at the handle_pdu */
295
296 /* 8.2.5.2 IIH PDU Processing */
297
298 /* 8.2.5.2 a) 1) Maximum Area Addresses */
299 /* Already checked, and can also be ommited */
300
301 /*
302 * Get the header
303 */
304 hdr = (struct isis_p2p_hello_hdr*) STREAM_PNT(circuit->rcv_stream);
305 circuit->rcv_stream->getp += ISIS_P2PHELLO_HDRLEN;
306
307 /* hdr.circuit_t = stream_getc (stream);
308 stream_get (hdr.source_id, stream, ISIS_SYS_ID_LEN);
309 hdr.hold_time = stream_getw (stream);
310 hdr.pdu_len = stream_getw (stream);
311 hdr.local_id = stream_getc (stream); */
312
313 /*
314 * My interpertation of the ISO, if no adj exists we will create one for
315 * the circuit
316 */
317
318 if (isis->debugs & DEBUG_ADJ_PACKETS) {
319 zlog_info("ISIS-Adj (%s): Rcvd P2P IIH from (%s), cir type %s,"
320 " cir id %02d, length %d",
321 circuit->area->area_tag, circuit->interface->name,
322 circuit_t2string(circuit->circuit_is_type),
323 circuit->circuit_id,ntohs(hdr->pdu_len));
324 }
325
326 adj = circuit->u.p2p.neighbor;
327 if ( !adj ) {
328 adj = isis_new_adj (hdr->source_id," ", 0, circuit);
329 if (adj == NULL)
330 return ISIS_ERROR;
331 circuit->u.p2p.neighbor = adj;
332 isis_adj_state_change(adj, ISIS_ADJ_INITIALIZING, NULL);
333 adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
334 }
335
336 /* 8.2.6 Monitoring point-to-point adjacencies */
337 adj->hold_time = ntohs (hdr->hold_time);
338 adj->last_upd = time (NULL);
339
340 /*
341 * Lets get the TLVS now
342 */
343 expected |= TLVFLAG_AREA_ADDRS;
344 expected |= TLVFLAG_AUTH_INFO;
345 expected |= TLVFLAG_NLPID;
346 expected |= TLVFLAG_IPV4_ADDR;
347 expected |= TLVFLAG_IPV6_ADDR;
348
349 retval = parse_tlvs (circuit->area->area_tag,
350 STREAM_PNT (circuit->rcv_stream),
351 ntohs (hdr->pdu_len) - ISIS_P2PHELLO_HDRLEN
352 - ISIS_FIXED_HDR_LEN,
353 &expected,
354 &found,
355 &tlvs);
356
357 if (retval > ISIS_WARNING) {
358 free_tlvs (&tlvs);
359 return retval;
360 };
361
362 /* 8.2.5.1 c) Authentication */
363 if (circuit->passwd.type) {
364 if (!(found & TLVFLAG_AUTH_INFO) ||
365 authentication_check (&circuit->passwd, &tlvs.auth_info)) {
366 isis_event_auth_failure (circuit->area->area_tag,
367 "P2P hello authentication failure",
368 hdr->source_id);
369 return ISIS_OK;
370 }
371 }
372
373 /* we do this now because the adj may not survive till the end... */
374
375 /* we need to copy addresses to the adj */
376 tlvs_to_adj_ipv4_addrs (&tlvs,adj);
377
378#ifdef HAVE_IPV6
379 tlvs_to_adj_ipv6_addrs (&tlvs,adj);
380#endif /* HAVE_IPV6 */
381
382 /* lets take care of the expiry */
d70f99e1 383 THREAD_TIMER_OFF(adj->t_expire);
384 THREAD_TIMER_ON(master, adj->t_expire, isis_adj_expire, adj,
eb5d44eb 385 (long)adj->hold_time);
386
387 /* 8.2.5.2 a) a match was detected */
388 if (area_match (circuit->area->area_addrs, tlvs.area_addrs)) {
389 /* 8.2.5.2 a) 2) If the system is L1 - table 5 */
390 if (circuit->area->is_type == IS_LEVEL_1) {
391 switch (hdr->circuit_t) {
392 case IS_LEVEL_1:
393 case IS_LEVEL_1_AND_2:
394 if (adj->adj_state != ISIS_ADJ_UP) {
395 /* (4) adj state up */
396 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
397 /* (5) adj usage level 1 */
398 adj->adj_usage = ISIS_ADJ_LEVEL1;
399 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
400 ; /* accept */
401 }
402 break;
403 case IS_LEVEL_2:
404 if (adj->adj_state != ISIS_ADJ_UP) {
405 /* (7) reject - wrong system type event */
406 zlog_warn ("wrongSystemType");
407 return ISIS_WARNING; /* Reject */
408 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
409 /* (6) down - wrong system */
410 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
411 }
412 break;
413 }
414 }
415
416 /* 8.2.5.2 a) 3) If the system is L1L2 - table 6 */
417 if (circuit->area->is_type == IS_LEVEL_1_AND_2) {
418 switch (hdr->circuit_t) {
419 case IS_LEVEL_1:
420 if (adj->adj_state != ISIS_ADJ_UP) {
421 /* (6) adj state up */
422 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
423 /* (7) adj usage level 1 */
424 adj->adj_usage = ISIS_ADJ_LEVEL1;
425 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
426 ; /* accept */
427 } else if ((adj->adj_usage == ISIS_ADJ_LEVEL1AND2) ||
428 (adj->adj_usage == ISIS_ADJ_LEVEL2)) {
429 /* (8) down - wrong system */
430 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
431 }
432 break;
433 case IS_LEVEL_2:
434 if (adj->adj_state != ISIS_ADJ_UP) {
435 /* (6) adj state up */
436 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
437 /* (9) adj usage level 2 */
438 adj->adj_usage = ISIS_ADJ_LEVEL2;
439 } else if ((adj->adj_usage == ISIS_ADJ_LEVEL1) ||
440 (adj->adj_usage == ISIS_ADJ_LEVEL1AND2)) {
441 /* (8) down - wrong system */
442 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
443 } else if (adj->adj_usage == ISIS_ADJ_LEVEL2) {
444 ; /* Accept */
445 }
446 break;
447 case IS_LEVEL_1_AND_2:
448 if (adj->adj_state != ISIS_ADJ_UP) {
449 /* (6) adj state up */
450 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
451 /* (10) adj usage level 1 */
452 adj->adj_usage = ISIS_ADJ_LEVEL1AND2;
453 } else if ((adj->adj_usage == ISIS_ADJ_LEVEL1) ||
454 (adj->adj_usage == ISIS_ADJ_LEVEL2)) {
455 /* (8) down - wrong system */
456 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
457 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2) {
458 ; /* Accept */
459 }
460 break;
461 }
462 }
463
464 /* 8.2.5.2 a) 4) If the system is L2 - table 7 */
465 if (circuit->area->is_type == IS_LEVEL_2) {
466 switch (hdr->circuit_t) {
467 case IS_LEVEL_1:
468 if (adj->adj_state != ISIS_ADJ_UP) {
469 /* (5) reject - wrong system type event */
470 zlog_warn ("wrongSystemType");
471 return ISIS_WARNING; /* Reject */
472 } else if ((adj->adj_usage == ISIS_ADJ_LEVEL1AND2) ||
473 (adj->adj_usage == ISIS_ADJ_LEVEL2)) {
474 /* (6) down - wrong system */
475 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
476 }
477 break;
478 case IS_LEVEL_1_AND_2:
479 case IS_LEVEL_2:
480 if (adj->adj_state != ISIS_ADJ_UP) {
481 /* (7) adj state up */
482 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
483 /* (8) adj usage level 2 */
484 adj->adj_usage = ISIS_ADJ_LEVEL2;
485 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2) {
486 /* (6) down - wrong system */
487 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
488 } else if (adj->adj_usage == ISIS_ADJ_LEVEL2) {
489 ; /* Accept */
490 }
491 break;
492 }
493 }
494 }
495 /* 8.2.5.2 b) if no match was detected */
496 else
497 {
498 if (circuit->area->is_type == IS_LEVEL_1) {
499 /* 8.2.5.2 b) 1) is_type L1 and adj is not up */
500 if (adj->adj_state != ISIS_ADJ_UP) {
501 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch");
502 /* 8.2.5.2 b) 2)is_type L1 and adj is up */
503 } else {
504 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Down - Area Mismatch");
505 }
506 }
507 /* 8.2.5.2 b 3 If the system is L2 or L1L2 - table 8 */
508 else
509 {
510 switch (hdr->circuit_t) {
511 case IS_LEVEL_1:
512 if (adj->adj_state != ISIS_ADJ_UP) {
513 /* (6) reject - Area Mismatch event */
514 zlog_warn ("AreaMismatch");
515 return ISIS_WARNING; /* Reject */
516 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
517 /* (7) down - area mismatch */
518 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch");
519
520 } else if ((adj->adj_usage == ISIS_ADJ_LEVEL1AND2) ||
521 (adj->adj_usage == ISIS_ADJ_LEVEL2)) {
522 /* (7) down - wrong system */
523 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
524 }
525 break;
526 case IS_LEVEL_1_AND_2:
527 case IS_LEVEL_2:
528 if (adj->adj_state != ISIS_ADJ_UP) {
529 /* (8) adj state up */
530 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
531 /* (9) adj usage level 2 */
532 adj->adj_usage = ISIS_ADJ_LEVEL2;
533 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
534 /* (7) down - wrong system */
535 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
536 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2) {
537 if (hdr->circuit_t == IS_LEVEL_2) {
538 /* (7) down - wrong system */
539 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
540 } else {
541 /* (7) down - area mismatch */
542 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch");
543 }
544 } else if (adj->adj_usage == ISIS_ADJ_LEVEL2) {
545 ; /* Accept */
546 }
547 break;
548 }
549 }
550 }
551 /* 8.2.5.2 c) if the action was up - comparing circuit IDs */
552 /* FIXME - Missing parts */
553
554
555 /* some of my own understanding of the ISO, why the heck does
556 * it not say what should I change the system_type to...
557 */
558 switch (adj->adj_usage) {
559 case ISIS_ADJ_LEVEL1:
560 adj->sys_type = ISIS_SYSTYPE_L1_IS;
561 break;
562 case ISIS_ADJ_LEVEL2:
563 adj->sys_type = ISIS_SYSTYPE_L2_IS;
564 break;
565 case ISIS_ADJ_LEVEL1AND2:
566 adj->sys_type = ISIS_SYSTYPE_L2_IS;
567 break;
568 case ISIS_ADJ_NONE:
569 adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
570 break;
571 }
572
573 adj->circuit_t = hdr->circuit_t;
574 adj->level = hdr->circuit_t;
575
576 free_tlvs (&tlvs);
577
578 return retval;
579}
580
581
582/*
583 * Process IS-IS LAN Level 1/2 Hello PDU
584 */
585static int
586process_lan_hello (int level, struct isis_circuit *circuit, u_char *ssnpa)
587{
588 int retval = ISIS_OK;
589 struct isis_lan_hello_hdr hdr;
590 struct isis_adjacency *adj;
591 u_int32_t expected = 0, found;
592 struct tlvs tlvs;
593 u_char *snpa;
594 struct listnode *node;
595
596 if ((stream_get_endp (circuit->rcv_stream) -
597 stream_get_getp (circuit->rcv_stream)) < ISIS_LANHELLO_HDRLEN) {
598 zlog_warn ("Packet too short");
599 return ISIS_WARNING;
600 }
601
602 if (circuit->ext_domain) {
603 zlog_info ("level %d LAN Hello received over circuit with "
604 "externalDomain = true", level);
605 return ISIS_WARNING;
606 }
607
608 if (!accept_level (level, circuit->circuit_is_type)) {
609 if (isis->debugs & DEBUG_ADJ_PACKETS) {
610 zlog_info ("ISIS-Adj (%s): Interface level mismatch, %s",
611 circuit->area->area_tag, circuit->interface->name);
612 }
613 return ISIS_WARNING;
614 }
615
616#if 0
617 /* Cisco's debug message compatability */
618 if (!accept_level (level, circuit->area->is_type)) {
619 if (isis->debugs & DEBUG_ADJ_PACKETS) {
620 zlog_info ("ISIS-Adj (%s): is type mismatch",
621 circuit->area->area_tag);
622 }
623 return ISIS_WARNING;
624 }
625#endif
626 /*
627 * Fill the header
628 */
629 hdr.circuit_t = stream_getc (circuit->rcv_stream);
630 stream_get (hdr.source_id, circuit->rcv_stream, ISIS_SYS_ID_LEN);
631 hdr.hold_time = stream_getw (circuit->rcv_stream);
632 hdr.pdu_len = stream_getw (circuit->rcv_stream);
633 hdr.prio = stream_getc (circuit->rcv_stream);
634 stream_get (hdr.lan_id, circuit->rcv_stream, ISIS_SYS_ID_LEN + 1);
635
636 if (hdr.circuit_t != IS_LEVEL_1 && hdr.circuit_t != IS_LEVEL_2 &&
637 hdr.circuit_t != IS_LEVEL_1_AND_2 ) {
638 zlog_warn ("Level %d LAN Hello with Circuit Type %d", level,
639 hdr.circuit_t);
640 return ISIS_ERROR;
641 }
642 /*
643 * Then get the tlvs
644 */
645 expected |= TLVFLAG_AUTH_INFO;
646 expected |= TLVFLAG_AREA_ADDRS;
647 expected |= TLVFLAG_LAN_NEIGHS;
648 expected |= TLVFLAG_NLPID;
649 expected |= TLVFLAG_IPV4_ADDR;
650 expected |= TLVFLAG_IPV6_ADDR;
651
652 retval = parse_tlvs (circuit->area->area_tag,
653 STREAM_PNT (circuit->rcv_stream),
654 hdr.pdu_len - ISIS_LANHELLO_HDRLEN - ISIS_FIXED_HDR_LEN,
655 &expected,
656 &found,
657 &tlvs);
658
659 if (retval > ISIS_WARNING) {
660 zlog_warn ("parse_tlvs() failed");
661 goto out;
662 }
663
664 if (!(found & TLVFLAG_AREA_ADDRS)) {
665 zlog_warn ("No Area addresses TLV in Level %d LAN IS to IS hello", level);
666 retval = ISIS_WARNING;
667 goto out;
668 }
669
670 if (circuit->passwd.type) {
671 if (!(found & TLVFLAG_AUTH_INFO) ||
672 authentication_check (&circuit->passwd, &tlvs.auth_info)) {
673 isis_event_auth_failure (circuit->area->area_tag,
674 "LAN hello authentication failure",
675 hdr.source_id);
676 retval = ISIS_WARNING;
677 goto out;
678 }
679 }
680
681 /*
682 * Accept the level 1 adjacency only if a match between local and
683 * remote area addresses is found
684 */
685 if (level == 1 && !area_match (circuit->area->area_addrs, tlvs.area_addrs)) {
686 if (isis->debugs & DEBUG_ADJ_PACKETS) {
687 zlog_info ("ISIS-Adj (%s): Area mismatch, level %d IIH on %s",
688 circuit->area->area_tag, level,circuit->interface->name);
689 }
690 retval = ISIS_OK;
691 goto out;
692 }
693
694 /*
695 * it's own IIH PDU - discard silently
696 */
697 if (!memcmp (circuit->u.bc.snpa, ssnpa, ETH_ALEN)) {
698 zlog_info ("ISIS-Adj (%s): it's own IIH PDU - discarded",
699 circuit->area->area_tag);
700
701 retval = ISIS_OK;
702 goto out;
703 }
704
705 /*
706 * check if it's own interface ip match iih ip addrs
707 */
708 if (!(found & TLVFLAG_IPV4_ADDR) || !ip_match(circuit->ip_addrs, tlvs.ipv4_addrs)) {
709 zlog_info("ISIS-Adj: No usable IP interface addresses in LAN IIH from %s\n",
710 circuit->interface->name);
711 retval = ISIS_WARNING;
712 goto out;
713 }
714
715
716 adj = isis_adj_lookup (hdr.source_id, circuit->u.bc.adjdb[level - 1]);
717 if (!adj) {
718 /*
719 * Do as in 8.4.2.5
720 */
721 adj = isis_new_adj (hdr.source_id, ssnpa, level, circuit);
722 if (adj == NULL)
723 retval = ISIS_ERROR;
724 goto out;
725
726 adj->level = level;
727 isis_adj_state_change(adj, ISIS_ADJ_INITIALIZING, NULL);
728
729 if (level == 1) {
730 adj->sys_type = ISIS_SYSTYPE_L1_IS;
731 } else {
732 adj->sys_type = ISIS_SYSTYPE_L2_IS;
733 }
734 list_delete_all_node (circuit->u.bc.lan_neighs[level - 1]);
735 isis_adj_build_neigh_list (circuit->u.bc.adjdb[level - 1],
736 circuit->u.bc.lan_neighs[level - 1]);
737 }
738
739 switch (level) {
740 case 1 :
741 if (memcmp(circuit->u.bc.l1_desig_is, hdr.lan_id, ISIS_SYS_ID_LEN + 1)) {
742 thread_add_event (master, isis_event_dis_status_change, circuit, 0);
743 memcpy (&circuit->u.bc.l1_desig_is, hdr.lan_id, ISIS_SYS_ID_LEN + 1);
744 }
745 break;
746 case 2 :
747 if (memcmp (circuit->u.bc.l2_desig_is, hdr.lan_id, ISIS_SYS_ID_LEN + 1)) {
748 thread_add_event (master, isis_event_dis_status_change, circuit, 0);
749 memcpy (&circuit->u.bc.l2_desig_is, hdr.lan_id, ISIS_SYS_ID_LEN + 1);
750 }
751 break;
752 }
753
754#if 0
755 /* Old solution: believe the lan-header always
756 */
757 if (level == 1) {
758 memcpy(circuit->u.bc.l1_desig_is, hdr.lan_id, ISIS_SYS_ID_LEN + 1);
759 } else if (level == 2) {
760 memcpy(circuit->u.bc.l2_desig_is, hdr.lan_id, ISIS_SYS_ID_LEN + 1);
761 }
762#endif
763
764 adj->hold_time = hdr.hold_time;
765 adj->last_upd = time (NULL);
766 adj->prio[level-1] = hdr.prio;
767
768 memcpy (adj->lanid, hdr.lan_id, ISIS_SYS_ID_LEN + 1);
769
770 /* which protocol are spoken ??? */
771 if (found & TLVFLAG_NLPID)
772 tlvs_to_adj_nlpids (&tlvs, adj);
773
774 /* we need to copy addresses to the adj */
775 if (found & TLVFLAG_IPV4_ADDR)
776 tlvs_to_adj_ipv4_addrs (&tlvs, adj);
777
778#ifdef HAVE_IPV6
779 if (found & TLVFLAG_IPV6_ADDR)
780 tlvs_to_adj_ipv6_addrs (&tlvs, adj);
781#endif /* HAVE_IPV6 */
782
783 adj->circuit_t = hdr.circuit_t;
784
785 /* lets take care of the expiry */
d70f99e1 786 THREAD_TIMER_OFF(adj->t_expire);
787 THREAD_TIMER_ON(master, adj->t_expire, isis_adj_expire, adj,
eb5d44eb 788 (long)adj->hold_time);
789
790 /*
791 * If the snpa for this circuit is found from LAN Neighbours TLV
792 * we have two-way communication -> adjacency can be put to state "up"
793 */
794
795 if (found & TLVFLAG_LAN_NEIGHS) {
796 if (adj->adj_state != ISIS_ADJ_UP) {
797 LIST_LOOP (tlvs.lan_neighs, snpa, node)
798 if (!memcmp (snpa, circuit->u.bc.snpa, ETH_ALEN)) {
799 isis_adj_state_change (adj, ISIS_ADJ_UP,
800 "own SNPA found in LAN Neighbours TLV");
801 }
802 }
803 }
804
805 out:
806 /* DEBUG_ADJ_PACKETS */
807 if (isis->debugs & DEBUG_ADJ_PACKETS) {
808 /* FIXME: is this place right? fix missing info */
809 zlog_info ("ISIS-Adj (%s): Rcvd L%d LAN IIH from %s on %s, cirType %s, "
810 "cirID %u, length %ld",
811 circuit->area->area_tag,
812 level,snpa_print(ssnpa), circuit->interface->name,
813 circuit_t2string(circuit->circuit_is_type),
814 circuit->circuit_id,
815 stream_get_endp (circuit->rcv_stream));
816 }
817
818
819 free_tlvs (&tlvs);
820
821 return retval;
822}
823
824/*
825 * Process Level 1/2 Link State
826 * ISO - 10589
827 * Section 7.3.15.1 - Action on receipt of a link state PDU
828 */
829static int
830process_lsp (int level, struct isis_circuit *circuit, u_char *ssnpa)
831{
832 struct isis_link_state_hdr *hdr;
833 struct isis_adjacency *adj = NULL;
834 struct isis_lsp *lsp, *lsp0 = NULL;
835 int retval = ISIS_OK, comp = 0;
836 u_char lspid[ISIS_SYS_ID_LEN + 2];
837 struct isis_passwd *passwd;
838
839 /* Sanity check - FIXME: move to correct place */
840 if ((stream_get_endp (circuit->rcv_stream) -
841 stream_get_getp (circuit->rcv_stream)) < ISIS_LSP_HDR_LEN ) {
842 zlog_warn ("Packet too short");
843 return ISIS_WARNING;
844 }
845
846 /* Reference the header */
847 hdr = (struct isis_link_state_hdr*)STREAM_PNT (circuit->rcv_stream);
848
849 if (isis->debugs & DEBUG_UPDATE_PACKETS) {
850 zlog_info ("ISIS-Upd (%s): Rcvd L%d LSP %s, seq 0x%08x, cksum 0x%04x, "
851 "lifetime %us, len %lu, on %s",
852 circuit->area->area_tag,
853 level,
854 rawlspid_print(hdr->lsp_id),
855 ntohl(hdr->seq_num),
856 ntohs(hdr->checksum),
857 ntohs(hdr->rem_lifetime),
858 circuit->rcv_stream->endp,
859 circuit->interface->name);
860 }
861
862 assert (ntohs (hdr->pdu_len) > ISIS_LSP_HDR_LEN);
863
864 /* Checksum sanity check - FIXME: move to correct place */
865 /* 12 = sysid+pdu+remtime */
866 if (iso_csum_verify (STREAM_PNT (circuit->rcv_stream) + 4,
867 ntohs (hdr->pdu_len) - 12, &hdr->checksum)) {
868 zlog_info ("ISIS-Upd (%s): LSP %s invalid LSP checksum 0x%04x",
869 circuit->area->area_tag,
870 rawlspid_print (hdr->lsp_id),
871 ntohs(hdr->checksum));
872
873 return ISIS_WARNING;
874 }
875
876 /* 7.3.15.1 a) 1 - external domain circuit will discard lsps */
877 if (circuit->ext_domain) {
878 zlog_info ("ISIS-Upd (%s): LSP %s received at level %d over circuit with "
879 "externalDomain = true",
880 circuit->area->area_tag,
881 rawlspid_print (hdr->lsp_id),
882 level);
883
884 return ISIS_WARNING;
885 }
886
887 /* 7.3.15.1 a) 2,3 - manualL2OnlyMode not implemented */
888 if (!accept_level (level, circuit->circuit_is_type)) {
889 zlog_info ("ISIS-Upd (%s): LSP %s received at level %d over circuit of"
890 " type %s",
891 circuit->area->area_tag,
892 rawlspid_print(hdr->lsp_id),
893 level,
894 circuit_t2string (circuit->circuit_is_type));
895
896 return ISIS_WARNING;
897 }
898
899 /* 7.3.15.1 a) 4 - need to make sure IDLength matches */
900
901 /* 7.3.15.1 a) 5 - maximum area match, can be ommited since we only use 3 */
902
903 /* 7.3.15.1 a) 7 - password check */
904 (level == ISIS_LEVEL1) ? (passwd = &circuit->area->area_passwd) :
905 (passwd = &circuit->area->domain_passwd);
906 if (passwd->type) {
907 if (isis_lsp_authinfo_check (circuit->rcv_stream, circuit->area,
908 ntohs (hdr->pdu_len), passwd)) {
909 isis_event_auth_failure (circuit->area->area_tag,
910 "LSP authentication failure",
911 hdr->lsp_id);
912 return ISIS_WARNING;
913 }
914 }
915 /* Find the LSP in our database and compare it to this Link State header */
916 lsp = lsp_search (hdr->lsp_id, circuit->area->lspdb[level - 1]);
917 if (lsp)
918 comp = lsp_compare (circuit->area->area_tag, lsp, hdr->seq_num,
919 hdr->checksum, hdr->rem_lifetime);
920 if (lsp && (lsp->own_lsp
921#ifdef TOPOLOGY_GENERATE
922 || lsp->from_topology
923#endif /* TOPOLOGY_GENERATE */
924 ))
925 goto dontcheckadj;
926
927 /* 7.3.15.1 a) 6 - Must check that we have an adjacency of the same level */
928 /* for broadcast circuits, snpa should be compared */
929 /* FIXME : Point To Point */
930
931 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
932 adj = isis_adj_lookup_snpa (ssnpa, circuit->u.bc.adjdb[level - 1]);
933 if (!adj) {
934 zlog_info ("(%s): DS ======= LSP %s, seq 0x%08x, cksum 0x%04x, "
935 "lifetime %us on %s",
936 circuit->area->area_tag,
937 rawlspid_print (hdr->lsp_id),
938 ntohl (hdr->seq_num),
939 ntohs (hdr->checksum),
940 ntohs (hdr->rem_lifetime),
941 circuit->interface->name);
942 return ISIS_WARNING; /* Silently discard */
943 }
944 }
945
946 /* for non broadcast, we just need to find same level adj */
947 else {
948 /* If no adj, or no sharing of level */
949 if (!circuit->u.p2p.neighbor) {
950 return ISIS_OK; /* Silently discard */
951 } else {
952 if (((level == 1) &&
953 (circuit->u.p2p.neighbor->adj_usage == ISIS_ADJ_LEVEL2)) ||
954 ((level == 2) &&
955 (circuit->u.p2p.neighbor->adj_usage == ISIS_ADJ_LEVEL1)))
956 return ISIS_WARNING; /* Silently discard */
957 }
958 }
959 dontcheckadj:
960 /* 7.3.15.1 a) 7 - Passwords for level 1 - not implemented */
961
962 /* 7.3.15.1 a) 8 - Passwords for level 2 - not implemented */
963
964 /* 7.3.15.1 a) 9 - OriginatingLSPBufferSize - not implemented FIXME: do it*/
965
966
967 /* 7.3.15.1 b) - If the remaining life time is 0, we perform 7.3.16.4*/
968 if (hdr->rem_lifetime == 0) {
969 if (!lsp) {
970 /* 7.3.16.4 a) 1) No LSP in db -> send an ack, but don't save */
971 /* only needed on explicit update, eg - p2p */
972 if (circuit->circ_type == CIRCUIT_T_P2P)
973 ack_lsp (hdr, circuit, level);
974 return retval; /* FIXME: do we need a purge? */
975 } else {
976 if (memcmp (hdr->lsp_id, isis->sysid, ISIS_SYS_ID_LEN )) {
977 /* LSP by some other system -> do 7.3.16.4 b) */
978 /* 7.3.16.4 b) 1) */
979 if (comp == LSP_NEWER) {
980 lsp_update (lsp, hdr, circuit->rcv_stream, circuit->area);
981 /* ii */
982 ISIS_FLAGS_SET_ALL (lsp->SRMflags);
983 /* iii */
984 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
985 /* v */
986 ISIS_FLAGS_CLEAR_ALL(lsp->SSNflags); /* FIXME: OTHER than c */
987 /* iv */
988 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
989 ISIS_SET_FLAG(lsp->SSNflags, circuit);
990
991 } /* 7.3.16.4 b) 2) */
992 else if (comp == LSP_EQUAL) {
993 /* i */
994 ISIS_CLEAR_FLAG(lsp->SRMflags, circuit);
995 /* ii*/
996 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
997 ISIS_SET_FLAG(lsp->SSNflags, circuit);
998 } /* 7.3.16.4 b) 3) */
999 else {
1000 ISIS_SET_FLAG(lsp->SRMflags, circuit);
1001 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
1002 }
1003 } else {
1004 /* our own LSP -> 7.3.16.4 c) */
1005 if (LSP_PSEUDO_ID(lsp->lsp_header->lsp_id) != circuit->circuit_id ||
1006 (LSP_PSEUDO_ID(lsp->lsp_header->lsp_id) == circuit->circuit_id &&
1007 circuit->u.bc.is_dr[level - 1] == 1) ) {
1008 lsp->lsp_header->seq_num = htonl (ntohl (hdr->seq_num) + 1);
1009 zlog_info ("LSP LEN: %d", ntohs (lsp->lsp_header->pdu_len));
1010 iso_csum_create (STREAM_DATA (lsp->pdu) + 12,
1011 ntohs (lsp->lsp_header->pdu_len) - 12, 12);
1012 ISIS_FLAGS_SET_ALL (lsp->SRMflags);
1013 zlog_info ("ISIS-Upd (%s): (1) re-originating LSP %s new seq 0x%08x",
1014 circuit->area->area_tag,
1015 rawlspid_print (hdr->lsp_id),
1016 ntohl (lsp->lsp_header->seq_num));
1017 lsp->lsp_header->rem_lifetime = htons (isis_jitter
1018 (circuit->area->
1019 max_lsp_lifetime[level-1],
1020 MAX_AGE_JITTER));
1021
1022 } else {
1023 /* Got purge for own pseudo-lsp, and we are not DR */
1024 lsp_purge_dr (lsp->lsp_header->lsp_id, circuit, level);
1025 }
1026 }
1027 }
1028 return retval;
1029 }
1030 /* 7.3.15.1 c) - If this is our own lsp and we don't have it initiate a
1031 * purge */
1032 if (memcmp (hdr->lsp_id, isis->sysid, ISIS_SYS_ID_LEN ) == 0) {
1033 if (!lsp) {
1034 /* 7.3.16.4: initiate a purge */
1035 lsp_purge_non_exist (hdr, circuit->area);
1036 return ISIS_OK;
1037 }
1038 /* 7.3.15.1 d) - If this is our own lsp and we have it */
1039
1040 /* In 7.3.16.1, If an Intermediate system R somewhere in the domain
1041 * has information that the current sequence number for source S is
1042 * "greater" than that held by S, ... */
1043
1044 else if (ntohl (hdr->seq_num) > ntohl (lsp->lsp_header->seq_num)) {
1045 /* 7.3.16.1 */
1046 lsp->lsp_header->seq_num = htonl (ntohl (hdr->seq_num) + 1);
1047
1048 iso_csum_create (STREAM_DATA (lsp->pdu) + 12,
1049 ntohs(lsp->lsp_header->pdu_len) - 12, 12);
1050
1051 ISIS_FLAGS_SET_ALL (lsp->SRMflags);
1052 zlog_info ("ISIS-Upd (%s): (2) re-originating LSP %s new seq 0x%08x",
1053 circuit->area->area_tag,
1054 rawlspid_print (hdr->lsp_id),
1055 ntohl (lsp->lsp_header->seq_num));
1056 lsp->lsp_header->rem_lifetime = htons (isis_jitter
1057 (circuit->
1058 area->max_lsp_lifetime[level-1],
1059 MAX_AGE_JITTER));
1060
1061 }
1062 } else {
1063 /* 7.3.15.1 e) - This lsp originated on another system */
1064
1065 /* 7.3.15.1 e) 1) LSP newer than the one in db or no LSP in db */
1066 if ((!lsp || comp == LSP_NEWER)){
1067 /* i */
1068 if (lsp) {
1069#ifdef EXTREME_DEBUG
1070 zlog_info ("level %d number is - %ld", level,
1071 circuit->area->lspdb[level-1]->dict_nodecount);
1072#endif /* EXTREME DEBUG */
1073 lsp_search_and_destroy (hdr->lsp_id, circuit->area->lspdb[level-1]);
1074 /* exists, so we overwrite */
1075#ifdef EXTREME_DEBUG
1076 zlog_info ("level %d number is - %ld",level,
1077 circuit->area->lspdb[level-1]->dict_nodecount);
1078#endif /* EXTREME DEBUG */
1079 }
1080 /*
1081 * If this lsp is a frag, need to see if we have zero lsp present
1082 */
1083 if (LSP_FRAGMENT (hdr->lsp_id) != 0) {
1084 memcpy (lspid, hdr->lsp_id, ISIS_SYS_ID_LEN + 1);
1085 LSP_FRAGMENT (lspid) = 0;
1086 lsp0 = lsp_search (lspid, circuit->area->lspdb[level - 1]);
1087 if (!lsp0) {
1088 zlog_info ("Got lsp frag, while zero lsp not database");
1089 return ISIS_OK;
1090 }
1091 }
1092 lsp = lsp_new_from_stream_ptr (circuit->rcv_stream, ntohs (hdr->pdu_len),
1093 lsp0, circuit->area);
1094 lsp->level = level;
1095 lsp->adj = adj;
1096 lsp_insert (lsp, circuit->area->lspdb[level-1]);
1097 /* ii */
1098 ISIS_FLAGS_SET_ALL (lsp->SRMflags);
1099 /* iii */
1100 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
1101
1102 /* iv */
1103 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1104 ISIS_SET_FLAG (lsp->SSNflags, circuit);
1105 /* FIXME: v) */
1106 }
1107 /* 7.3.15.1 e) 2) LSP equal to the one in db */
1108 else if (comp == LSP_EQUAL) {
1109 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
1110 lsp_update (lsp, hdr, circuit->rcv_stream, circuit->area);
1111 if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
1112 ISIS_SET_FLAG (lsp->SSNflags, circuit);
1113 }
1114 }
1115 /* 7.3.15.1 e) 3) LSP older than the one in db */
1116 else {
1117 ISIS_SET_FLAG(lsp->SRMflags, circuit);
1118 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
1119 }
1120 }
1121 if (lsp)
1122 lsp->adj = adj;
1123 return retval;
1124}
1125
1126/*
1127 * Process Sequence Numbers
1128 * ISO - 10589
1129 * Section 7.3.15.2 - Action on receipt of a sequence numbers PDU
1130 */
1131
1132int
1133process_snp (int snp_type, int level, struct isis_circuit *circuit,
1134 u_char *ssnpa)
1135{
1136 int retval = ISIS_OK;
1137 int cmp, own_lsp;
1138 char typechar = ' ';
1139 int len;
1140 struct isis_adjacency *adj;
1141 struct isis_complete_seqnum_hdr *chdr = NULL;
1142 struct isis_partial_seqnum_hdr *phdr = NULL;
1143 uint32_t found = 0, expected = 0;
1144 struct isis_lsp *lsp;
1145 struct lsp_entry *entry;
1146 struct listnode *node,*node2;
1147 struct tlvs tlvs;
1148 struct list *lsp_list = NULL;
1149 struct isis_passwd *passwd;
1150
1151 if (snp_type == ISIS_SNP_CSNP_FLAG) {
1152 /* getting the header info */
1153 typechar = 'C';
1154 chdr = (struct isis_complete_seqnum_hdr*)STREAM_PNT(circuit->rcv_stream);
1155 circuit->rcv_stream->getp += ISIS_CSNP_HDRLEN;
1156 len = ntohs(chdr->pdu_len);
1157 if (len < ISIS_CSNP_HDRLEN) {
1158 zlog_warn ("Received a CSNP with bogus length!");
1159 return ISIS_OK;
1160 }
1161 } else {
1162 typechar = 'P';
1163 phdr = (struct isis_partial_seqnum_hdr*)STREAM_PNT(circuit->rcv_stream);
1164 circuit->rcv_stream->getp += ISIS_PSNP_HDRLEN;
1165 len = ntohs(phdr->pdu_len);
1166 if (len < ISIS_PSNP_HDRLEN) {
1167 zlog_warn ("Received a CSNP with bogus length!");
1168 return ISIS_OK;
1169 }
1170 }
1171
1172 /* 7.3.15.2 a) 1 - external domain circuit will discard snp pdu */
1173 if (circuit->ext_domain) {
1174
1175 zlog_info ("ISIS-Snp (%s): Rcvd L%d %cSNP on %s, "
1176 "skipping: circuit externalDomain = true",
1177 circuit->area->area_tag,
1178 level,
1179 typechar,
1180 circuit->interface->name);
1181
1182 return ISIS_OK;
1183 }
1184
1185 /* 7.3.15.2 a) 2,3 - manualL2OnlyMode not implemented */
1186 if (!accept_level (level, circuit->circuit_is_type)) {
1187
1188 zlog_info ("ISIS-Snp (%s): Rcvd L%d %cSNP on %s, "
1189 "skipping: circuit type %s does not match level %d",
1190 circuit->area->area_tag,
1191 level,
1192 typechar,
1193 circuit->interface->name,
1194 circuit_t2string (circuit->circuit_is_type),
1195 level);
1196
1197 return ISIS_OK;
1198 }
1199
1200 /* 7.3.15.2 a) 4 - not applicable for CSNP only PSNPs on broadcast */
1201 if ((snp_type == ISIS_SNP_PSNP_FLAG) &&
1202 (circuit->circ_type == CIRCUIT_T_BROADCAST)) {
1203 if (!circuit->u.bc.is_dr[level-1]) {
1204
1205 zlog_info ("ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s, "
1206 "skipping: we are not the DIS",
1207 circuit->area->area_tag,
1208 level,
1209 typechar,
1210 snpa_print(ssnpa),
1211 circuit->interface->name);
1212
1213 return ISIS_OK;
1214 }
1215 }
1216
1217 /* 7.3.15.2 a) 5 - need to make sure IDLength matches - already checked */
1218
1219 /* 7.3.15.2 a) 6 - maximum area match, can be ommited since we only use 3
1220 * - already checked */
1221
1222 /* 7.3.15.2 a) 7 - Must check that we have an adjacency of the same level */
1223 /* for broadcast circuits, snpa should be compared */
1224 /* FIXME : Do we need to check SNPA? */
1225 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1226 if (snp_type == ISIS_SNP_CSNP_FLAG) {
1227 adj = isis_adj_lookup (chdr->source_id, circuit->u.bc.adjdb[level - 1]);
1228 } else {
1229 /* a psnp on a broadcast, how lovely of Juniper :) */
1230 adj = isis_adj_lookup (phdr->source_id, circuit->u.bc.adjdb[level - 1]);
1231 }
1232 if (!adj)
1233 return ISIS_OK; /* Silently discard */
1234 } else {
1235 if (!circuit->u.p2p.neighbor)
1236 return ISIS_OK; /* Silently discard */
1237 }
1238
1239 /* 7.3.15.2 a) 8 - Passwords for level 1 - not implemented */
1240
1241 /* 7.3.15.2 a) 9 - Passwords for level 2 - not implemented */
1242
1243 memset (&tlvs, 0, sizeof (struct tlvs));
1244
1245 /* parse the SNP */
1246 expected |= TLVFLAG_LSP_ENTRIES;
1247 expected |= TLVFLAG_AUTH_INFO;
1248 retval = parse_tlvs (circuit->area->area_tag,
1249 STREAM_PNT(circuit->rcv_stream),
1250 len - circuit->rcv_stream->getp,
1251 &expected,
1252 &found,
1253 &tlvs);
1254
1255 if (retval > ISIS_WARNING) {
1256 zlog_warn ("something went very wrong processing SNP");
1257 free_tlvs (&tlvs);
1258 return retval;
1259 }
1260
1261 (level == 1) ? (passwd = &circuit->area->area_passwd) :
1262 (passwd = &circuit->area->domain_passwd);
1263 if (passwd->type) {
1264 if (!(found & TLVFLAG_AUTH_INFO) ||
1265 authentication_check (passwd, &tlvs.auth_info)) {
1266 isis_event_auth_failure (circuit->area->area_tag, "SNP authentication"
1267 " failure", phdr ?
1268 phdr->source_id : chdr->source_id);
1269 return ISIS_OK;
1270 }
1271 }
1272
1273 /* debug isis snp-packets */
1274 if (isis->debugs & DEBUG_SNP_PACKETS) {
1275 zlog_info ("ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s",
1276 circuit->area->area_tag,
1277 level,
1278 typechar,
1279 snpa_print(ssnpa),
1280 circuit->interface->name);
1281 if (tlvs.lsp_entries) {
1282 LIST_LOOP (tlvs.lsp_entries,entry,node) {
1283 zlog_info("ISIS-Snp (%s): %cSNP entry %s, seq 0x%08x,"
1284 " cksum 0x%04x, lifetime %us",
1285 circuit->area->area_tag,
1286 typechar,
1287 rawlspid_print (entry->lsp_id),
1288 ntohl (entry->seq_num),
1289 ntohs (entry->checksum),
1290 ntohs (entry->rem_lifetime));
1291 }
1292 }
1293 }
1294
1295 /* 7.3.15.2 b) Actions on LSP_ENTRIES reported */
1296 if (tlvs.lsp_entries) {
1297 LIST_LOOP (tlvs.lsp_entries, entry, node) {
1298 lsp = lsp_search (entry->lsp_id, circuit->area->lspdb[level - 1]);
1299 own_lsp = !memcmp (entry->lsp_id, isis->sysid, ISIS_SYS_ID_LEN);
1300 if (lsp) {
1301 /* 7.3.15.2 b) 1) is this LSP newer */
1302 cmp = lsp_compare (circuit->area->area_tag, lsp, entry->seq_num,
1303 entry->checksum, entry->rem_lifetime);
1304 /* 7.3.15.2 b) 2) if it equals, clear SRM on p2p */
1305 if (cmp == LSP_EQUAL) {
1306 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1307 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
1308 /* 7.3.15.2 b) 3) if it is older, clear SSN and set SRM */
1309 } else if (cmp == LSP_OLDER) {
1310 ISIS_CLEAR_FLAG (lsp->SSNflags, circuit);
1311 ISIS_SET_FLAG (lsp->SRMflags, circuit);
1312 } else {
1313 /* 7.3.15.2 b) 4) if it is newer, set SSN and clear SRM on p2p*/
1314 if (own_lsp) {
1315 lsp_inc_seqnum (lsp, ntohl (entry->seq_num));
1316 ISIS_SET_FLAG (lsp->SRMflags, circuit);
1317 } else {
1318 ISIS_SET_FLAG (lsp->SSNflags, circuit);
1319 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1320 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
1321 }
1322 }
1323 } else {
1324 /* 7.3.15.2 b) 5) if it was not found, and all of those are not 0,
1325 * insert it and set SSN on it */
1326 if (entry->rem_lifetime && entry->checksum && entry->seq_num &&
1327 memcmp (entry->lsp_id, isis->sysid, ISIS_SYS_ID_LEN)) {
1328 lsp = lsp_new (entry->lsp_id, ntohs (entry->rem_lifetime),
1329 0, 0, entry->checksum, level);
1330 lsp_insert (lsp, circuit->area->lspdb[level - 1]);
1331 ISIS_SET_FLAG (lsp->SSNflags, circuit);
1332 }
1333 }
1334 }
1335 }
1336
1337 /* 7.3.15.2 c) on CSNP set SRM for all in range which were not reported */
1338 if (snp_type == ISIS_SNP_CSNP_FLAG) {
1339 /*
1340 * Build a list from our own LSP db bounded with start_ and stop_lsp_id
1341 */
1342 lsp_list = list_new ();
1343 lsp_build_list_nonzero_ht (chdr->start_lsp_id, chdr->stop_lsp_id,
1344 lsp_list, circuit->area->lspdb[level - 1]);
1345
1346 /* Fixme: Find a better solution */
1347 if (tlvs.lsp_entries) {
1348 LIST_LOOP (tlvs.lsp_entries, entry, node) {
1349 LIST_LOOP (lsp_list, lsp, node2) {
1350 if (lsp_id_cmp (lsp->lsp_header->lsp_id, entry->lsp_id) == 0) {
1351 list_delete_node (lsp_list, node2);
1352 break;
1353 }
1354 }
1355 }
1356 }
1357 /* on remaining LSPs we set SRM (neighbor knew not of) */
1358 LIST_LOOP (lsp_list, lsp, node2) {
1359 ISIS_SET_FLAG (lsp->SRMflags, circuit);
1360 }
1361 /* lets free it */
1362 list_free (lsp_list);
1363 }
1364
1365 free_tlvs (&tlvs);
1366 return retval;
1367}
1368
1369int
1370process_csnp (int level, struct isis_circuit *circuit, u_char *ssnpa)
1371{
1372
1373 /* Sanity check - FIXME: move to correct place */
1374 if ((stream_get_endp (circuit->rcv_stream) -
1375 stream_get_getp (circuit->rcv_stream)) < ISIS_CSNP_HDRLEN) {
1376 zlog_warn ("Packet too short ( < %d)", ISIS_CSNP_HDRLEN);
1377 return ISIS_WARNING;
1378 }
1379
1380 return process_snp (ISIS_SNP_CSNP_FLAG, level, circuit, ssnpa);
1381}
1382
1383int
1384process_psnp (int level, struct isis_circuit *circuit, u_char *ssnpa)
1385{
1386
1387 if ((stream_get_endp (circuit->rcv_stream) -
1388 stream_get_getp (circuit->rcv_stream)) < ISIS_PSNP_HDRLEN) {
1389 zlog_warn ("Packet too short");
1390 return ISIS_WARNING;
1391 }
1392
1393 return process_snp (ISIS_SNP_PSNP_FLAG, level, circuit, ssnpa);
1394}
1395
1396
1397
1398/*
1399 * Process ISH
1400 * ISO - 10589
1401 * Section 8.2.2 - Receiving ISH PDUs by an intermediate system
1402 * FIXME: sample packet dump, need to figure 0x81 - looks like NLPid
1403 0x82 0x15 0x01 0x00 0x04 0x01 0x2c 0x59
1404 0x38 0x08 0x47 0x00 0x01 0x00 0x02 0x00
1405 0x03 0x00 0x81 0x01 0xcc
1406 */
1407int
1408process_is_hello (struct isis_circuit *circuit)
1409{
1410 struct isis_adjacency *adj;
1411 int retval = ISIS_OK;
1412 u_char neigh_len;
1413 u_char *sysid;
1414
1415 /* In this point in time we are not yet able to handle is_hellos
1416 * on lan - Sorry juniper...
1417 */
1418 if (circuit->circ_type == CIRCUIT_T_BROADCAST)
1419 return retval;
1420
1421 neigh_len = stream_getc (circuit->rcv_stream);
1422 sysid = STREAM_PNT(circuit->rcv_stream) + neigh_len - 1 - ISIS_SYS_ID_LEN;
1423 adj = circuit->u.p2p.neighbor;
1424 if (!adj) {
1425 /* 8.2.2 */
1426 adj = isis_new_adj (sysid, " ", 0, circuit);
1427 if (adj == NULL)
1428 return ISIS_ERROR;
1429
1430 isis_adj_state_change (adj, ISIS_ADJ_INITIALIZING, NULL);
1431 adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
1432 circuit->u.p2p.neighbor = adj;
1433 }
1434 /* 8.2.2 a)*/
1435 if ((adj->adj_state == ISIS_ADJ_UP) && memcmp (adj->sysid,sysid,
1436 ISIS_SYS_ID_LEN)) {
1437 /* 8.2.2 a) 1) FIXME: adjStateChange(down) event */
1438 /* 8.2.2 a) 2) delete the adj */
1439 XFREE (MTYPE_ISIS_ADJACENCY, adj);
1440 /* 8.2.2 a) 3) create a new adj */
1441 adj = isis_new_adj (sysid, " ", 0, circuit);
1442 if (adj == NULL)
1443 return ISIS_ERROR;
1444
1445 /* 8.2.2 a) 3) i */
1446 isis_adj_state_change (adj, ISIS_ADJ_INITIALIZING, NULL);
1447 /* 8.2.2 a) 3) ii */
1448 adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
1449 /* 8.2.2 a) 4) quite meaningless */
1450 }
1451 /* 8.2.2 b) ignore on condition */
1452 if ((adj->adj_state == ISIS_ADJ_INITIALIZING) &&
1453 (adj->sys_type == ISIS_SYSTYPE_IS)) {
1454 /* do nothing */
1455 } else {
1456 /* 8.2.2 c) respond with a p2p IIH */
1457 send_hello (circuit, 1);
1458 }
1459 /* 8.2.2 d) type is IS */
1460 adj->sys_type = ISIS_SYSTYPE_IS;
1461 /* 8.2.2 e) FIXME: Circuit type of? */
1462
1463
1464 return retval;
1465}
1466
1467
1468/*
1469 * PDU Dispatcher
1470 */
1471
1472int
1473isis_handle_pdu (struct isis_circuit *circuit, u_char *ssnpa)
1474{
1475
1476 struct isis_fixed_hdr *hdr;
1477 struct esis_fixed_hdr *esis_hdr;
1478
1479 int retval=ISIS_OK;
1480
1481 /*
1482 * Let's first read data from stream to the header
1483 */
1484 hdr = (struct isis_fixed_hdr*)STREAM_DATA(circuit->rcv_stream);
1485
1486 if ((hdr->idrp != ISO10589_ISIS) && (hdr->idrp != ISO9542_ESIS)){
1487 zlog_warn ("Not an IS-IS or ES-IS packet IDRP=%02x", hdr->idrp);
1488 return ISIS_ERROR;
1489 }
1490
1491 /* now we need to know if this is an ISO 9542 packet and
1492 * take real good care of it, waaa!
1493 */
1494 if (hdr->idrp == ISO9542_ESIS){
1495 esis_hdr = (struct esis_fixed_hdr*)STREAM_DATA(circuit->rcv_stream);
1496 stream_set_getp (circuit->rcv_stream, ESIS_FIXED_HDR_LEN);
1497 /* FIXME: Need to do some acceptence tests */
1498 /* example length... */
1499 switch (esis_hdr->pdu_type) {
1500 case ESH_PDU:
1501 /* FIXME */
1502 break;
1503 case ISH_PDU:
1504 zlog_info ("AN ISH PDU!!");
1505 retval = process_is_hello (circuit);
1506 break;
1507 default:
1508 return ISIS_ERROR;
1509 }
1510 return retval;
1511 } else {
1512 stream_set_getp (circuit->rcv_stream, ISIS_FIXED_HDR_LEN);
1513 }
1514 /*
1515 * and then process it
1516 */
1517
1518 if (hdr->length < ISIS_MINIMUM_FIXED_HDR_LEN) {
1519 zlog_err ("Fixed header length = %d", hdr->length);
1520 return ISIS_ERROR;
1521 }
1522
1523 if (hdr->version1 != 1) {
1524 zlog_warn ("Unsupported ISIS version %u", hdr->version1);
1525 return ISIS_WARNING;
1526 }
1527 /* either 6 or 0 */
1528 if ((hdr->id_len != 0) && (hdr->id_len != ISIS_SYS_ID_LEN)) {
1529 zlog_err ("IDFieldLengthMismatch: ID Length field in a received PDU %u, "
1530 "while the parameter for this IS is %u", hdr->id_len,
1531 ISIS_SYS_ID_LEN);
1532 return ISIS_ERROR;
1533 }
1534
1535 if (hdr->version2 != 1) {
1536 zlog_warn ("Unsupported ISIS version %u", hdr->version2);
1537 return ISIS_WARNING;
1538 }
1539 /* either 3 or 0 */
1540 if ((hdr->max_area_addrs != 0) && (hdr->max_area_addrs != isis->max_area_addrs)) {
1541 zlog_err ("maximumAreaAddressesMismatch: maximumAreaAdresses in a "
1542 "received PDU %u while the parameter for this IS is %u",
1543 hdr->max_area_addrs, isis->max_area_addrs);
1544 return ISIS_ERROR;
1545 }
1546
1547 switch (hdr->pdu_type) {
1548 case L1_LAN_HELLO:
1549 retval = process_lan_hello (ISIS_LEVEL1, circuit, ssnpa);
1550 break;
1551 case L2_LAN_HELLO:
1552 retval = process_lan_hello (ISIS_LEVEL2, circuit, ssnpa);
1553 break;
1554 case P2P_HELLO:
1555 retval = process_p2p_hello (circuit);
1556 break;
1557 case L1_LINK_STATE:
1558 retval = process_lsp (ISIS_LEVEL1, circuit, ssnpa);
1559 break;
1560 case L2_LINK_STATE:
1561 retval = process_lsp (ISIS_LEVEL2, circuit, ssnpa);
1562 break;
1563 case L1_COMPLETE_SEQ_NUM:
1564 retval = process_csnp (ISIS_LEVEL1, circuit, ssnpa);
1565 break;
1566 case L2_COMPLETE_SEQ_NUM:
1567 retval = process_csnp (ISIS_LEVEL2, circuit, ssnpa);
1568 break;
1569 case L1_PARTIAL_SEQ_NUM:
1570 retval = process_psnp (ISIS_LEVEL1, circuit, ssnpa);
1571 break;
1572 case L2_PARTIAL_SEQ_NUM:
1573 retval = process_psnp (ISIS_LEVEL2, circuit, ssnpa);
1574 break;
1575 default:
1576 return ISIS_ERROR;
1577 }
1578
1579 return retval;
1580}
1581
1582
1583#ifdef GNU_LINUX
1584int
1585isis_receive (struct thread *thread)
1586{
1587
1588 struct isis_circuit *circuit;
1589 u_char ssnpa[ETH_ALEN];
1590 int retval;
1591
1592 /*
1593 * Get the circuit
1594 */
1595 circuit = THREAD_ARG (thread);
1596 assert (circuit);
1597
1598 if (circuit->rcv_stream == NULL)
1599 circuit->rcv_stream = stream_new (ISO_MTU(circuit));
1600 else
1601 stream_reset (circuit->rcv_stream);
1602
1603 retval = circuit->rx (circuit, ssnpa);
1604 circuit->t_read = NULL;
1605
1606 if (retval == ISIS_OK)
1607 retval = isis_handle_pdu (circuit, ssnpa);
1608
1609 /*
1610 * prepare for next packet.
1611 */
d70f99e1 1612 THREAD_READ_ON(master, circuit->t_read, isis_receive, circuit, circuit->fd);
eb5d44eb 1613
1614 return retval;
1615}
1616
1617#else
1618int
1619isis_receive (struct thread *thread)
1620{
1621
1622 struct isis_circuit *circuit;
1623 u_char ssnpa[ETH_ALEN];
1624 int retval;
1625
1626 /*
1627 * Get the circuit
1628 */
1629 circuit = THREAD_ARG (thread);
1630 assert (circuit);
1631
1632 circuit->t_read = NULL;
1633
1634 if (circuit->rcv_stream == NULL)
1635 circuit->rcv_stream = stream_new (ISO_MTU(circuit));
1636 else
1637 stream_reset (circuit->rcv_stream);
1638
1639 retval = circuit->rx (circuit, ssnpa);
1640
1641 if (retval == ISIS_OK)
1642 retval = isis_handle_pdu (circuit, ssnpa);
1643
1644 /*
1645 * prepare for next packet.
1646 */
1647 circuit->t_read = thread_add_timer_msec (master, isis_receive, circuit,
1648 listcount
1649 (circuit->area->circuit_list)*100);
1650
1651
1652 return retval;
1653}
1654
1655#endif
1656
1657 /* filling of the fixed isis header */
1658void
1659fill_fixed_hdr (struct isis_fixed_hdr *hdr, u_char pdu_type)
1660{
1661 memset (hdr, 0, sizeof (struct isis_fixed_hdr));
1662
1663 hdr->idrp = ISO10589_ISIS;
1664
1665 switch (pdu_type) {
1666 case L1_LAN_HELLO:
1667 case L2_LAN_HELLO:
1668 hdr->length = ISIS_LANHELLO_HDRLEN;
1669 break;
1670 case P2P_HELLO:
1671 hdr->length = ISIS_P2PHELLO_HDRLEN;
1672 break;
1673 case L1_LINK_STATE:
1674 case L2_LINK_STATE:
1675 hdr->length = ISIS_LSP_HDR_LEN;
1676 break;
1677 case L1_COMPLETE_SEQ_NUM:
1678 case L2_COMPLETE_SEQ_NUM:
1679 hdr->length = ISIS_CSNP_HDRLEN;
1680 break;
1681 case L1_PARTIAL_SEQ_NUM:
1682 case L2_PARTIAL_SEQ_NUM:
1683 hdr->length = ISIS_PSNP_HDRLEN;
1684 break;
1685 default:
1686 zlog_warn ("fill_fixed_hdr(): unknown pdu type %d", pdu_type);
1687 return;
1688 }
1689 hdr->length += ISIS_FIXED_HDR_LEN;
1690 hdr->pdu_type = pdu_type;
1691 hdr->version1 = 1;
1692 hdr->id_len = 0; /* ISIS_SYS_ID_LEN - 0==6 */
1693 hdr->version2 = 1;
1694 hdr->max_area_addrs = 0; /* isis->max_area_addrs - 0==3 */
1695}
1696
1697
1698/*
1699 * SEND SIDE
1700 */
1701void
1702fill_fixed_hdr_andstream (struct isis_fixed_hdr *hdr, u_char pdu_type,
1703 struct stream *stream)
1704{
1705 fill_fixed_hdr (hdr,pdu_type);
1706
1707 stream_putc (stream, hdr->idrp);
1708 stream_putc (stream, hdr->length);
1709 stream_putc (stream, hdr->version1);
1710 stream_putc (stream, hdr->id_len);
1711 stream_putc (stream, hdr->pdu_type);
1712 stream_putc (stream, hdr->version2);
1713 stream_putc (stream, hdr->reserved);
1714 stream_putc (stream, hdr->max_area_addrs);
1715
1716 return;
1717}
1718
1719
1720int
1721send_hello (struct isis_circuit *circuit, int level)
1722{
1723 struct isis_fixed_hdr fixed_hdr;
1724 struct isis_lan_hello_hdr hello_hdr;
1725 struct isis_p2p_hello_hdr p2p_hello_hdr;
1726
1727 u_int32_t interval;
1728 unsigned long len_pointer, length;
1729 int retval;
1730
1731 if (circuit->interface->mtu == 0) {
1732 zlog_warn ("circuit has zero MTU");
1733 return ISIS_WARNING;
1734 }
1735
1736 if (!circuit->snd_stream)
1737 circuit->snd_stream = stream_new (ISO_MTU(circuit));
1738 else
1739 stream_reset (circuit->snd_stream);
1740
1741 if (circuit->circ_type == CIRCUIT_T_BROADCAST)
1742 if (level == 1)
1743 fill_fixed_hdr_andstream(&fixed_hdr, L1_LAN_HELLO, circuit->snd_stream);
1744 else
1745 fill_fixed_hdr_andstream(&fixed_hdr, L2_LAN_HELLO, circuit->snd_stream);
1746 else
1747 fill_fixed_hdr_andstream(&fixed_hdr, P2P_HELLO, circuit->snd_stream);
1748
1749 /*
1750 * Fill LAN Level 1 or 2 Hello PDU header
1751 */
1752 memset (&hello_hdr, 0, sizeof (struct isis_lan_hello_hdr));
1753 interval = circuit->hello_multiplier[level - 1] *
1754 circuit->hello_interval[level - 1];
1755 if (interval > USHRT_MAX)
1756 interval = USHRT_MAX;
1757 hello_hdr.circuit_t = circuit->circuit_is_type;
1758 memcpy (hello_hdr.source_id, isis->sysid, ISIS_SYS_ID_LEN);
1759 hello_hdr.hold_time = htons((u_int16_t)interval);
1760
1761 hello_hdr.pdu_len = 0; /* Update the PDU Length later */
1762 len_pointer = stream_get_putp (circuit->snd_stream) + 3 + ISIS_SYS_ID_LEN;
1763
1764
1765 /* copy the shared part of the hello to the p2p hello if needed */
1766 if (circuit->circ_type == CIRCUIT_T_P2P) {
1767 memcpy (&p2p_hello_hdr, &hello_hdr, 5 + ISIS_SYS_ID_LEN);
1768 p2p_hello_hdr.local_id = circuit->circuit_id;
1769 /* FIXME: need better understanding */
1770 stream_put (circuit->snd_stream, &p2p_hello_hdr, ISIS_P2PHELLO_HDRLEN);
1771 } else {
1772 hello_hdr.prio = circuit->u.bc.priority[level - 1];
1773 if(level == 1 && circuit->u.bc.l1_desig_is) {
1774 memcpy(hello_hdr.lan_id, circuit->u.bc.l1_desig_is, ISIS_SYS_ID_LEN + 1);
1775 } else if (level == 2 && circuit->u.bc.l2_desig_is){
1776 memcpy(hello_hdr.lan_id, circuit->u.bc.l2_desig_is, ISIS_SYS_ID_LEN + 1);
1777 }
1778 stream_put (circuit->snd_stream, &hello_hdr, ISIS_LANHELLO_HDRLEN);
1779 }
1780
1781 /*
1782 * Then the variable length part
1783 */
1784 /* add circuit password */
1785 if (circuit->passwd.type)
1786 if (tlv_add_authinfo (circuit->passwd.type, circuit->passwd.len,
1787 circuit->passwd.passwd, circuit->snd_stream))
1788 return ISIS_WARNING;
1789 /* Area Addresses TLV */
1790 assert (circuit->area);
1791 if (circuit->area->area_addrs && circuit->area->area_addrs->count > 0)
1792 if (tlv_add_area_addrs (circuit->area->area_addrs, circuit->snd_stream))
1793 return ISIS_WARNING;
1794
1795 /* LAN Neighbors TLV */
1796 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1797 if (level == 1 && circuit->u.bc.lan_neighs[0]->count > 0)
1798 if (tlv_add_lan_neighs (circuit->u.bc.lan_neighs[0],
1799 circuit->snd_stream))
1800 return ISIS_WARNING;
1801 if (level == 2 && circuit->u.bc.lan_neighs[1]->count > 0)
1802 if (tlv_add_lan_neighs (circuit->u.bc.lan_neighs[1],
1803 circuit->snd_stream))
1804 return ISIS_WARNING;
1805 }
1806
1807 /* Protocols Supported TLV */
1808 if (circuit->nlpids.count > 0)
1809 if (tlv_add_nlpid (&circuit->nlpids, circuit->snd_stream))
1810 return ISIS_WARNING;
1811 /* IP interface Address TLV */
1812 if (circuit->ip_router && circuit->ip_addrs && circuit->ip_addrs->count > 0)
1813 if (tlv_add_ip_addrs (circuit->ip_addrs, circuit->snd_stream))
1814 return ISIS_WARNING;
1815
1816#ifdef HAVE_IPV6
1817 /* IPv6 Interface Address TLV */
1818 if (circuit->ipv6_router && circuit->ipv6_link &&
1819 circuit->ipv6_link->count > 0)
1820 if (tlv_add_ipv6_addrs (circuit->ipv6_link, circuit->snd_stream))
1821 return ISIS_WARNING;
1822#endif /* HAVE_IPV6 */
1823
1824 if (circuit->u.bc.pad_hellos)
1825 if (tlv_add_padding (circuit->snd_stream))
1826 return ISIS_WARNING;
1827
1828 length = stream_get_putp (circuit->snd_stream);
1829 /* Update PDU length */
1830 stream_putw_at (circuit->snd_stream, len_pointer, (u_int16_t)length);
1831
1832 retval = circuit->tx (circuit, level);
1833 if (retval)
1834 zlog_warn ("sending of LAN Level %d Hello failed", level);
1835
1836 /* DEBUG_ADJ_PACKETS */
1837 if (isis->debugs & DEBUG_ADJ_PACKETS) {
1838 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1839 zlog_info ("ISIS-Adj (%s): Sent L%d LAN IIH on %s, length %ld",
1840 circuit->area->area_tag, level, circuit->interface->name,
1841 STREAM_SIZE(circuit->snd_stream));
1842 } else {
1843 zlog_info ("ISIS-Adj (%s): Sent P2P IIH on %s, length %ld",
1844 circuit->area->area_tag, circuit->interface->name,
1845 STREAM_SIZE(circuit->snd_stream));
1846 }
1847 }
1848
1849
1850 return retval;
1851}
1852
1853int
1854send_lan_hello (struct isis_circuit *circuit, int level)
1855{
1856 return send_hello (circuit,level);
1857}
1858
1859int
1860send_lan_l1_hello (struct thread *thread)
1861{
1862
1863 struct isis_circuit *circuit;
1864 int retval;
1865
1866 circuit = THREAD_ARG (thread);
1867 assert (circuit);
1868 circuit->u.bc.t_send_lan_hello[0] = NULL;
1869
1870 if (circuit->u.bc.run_dr_elect[0])
1871 retval = isis_dr_elect (circuit, 1);
1872
1873 retval = send_lan_hello (circuit, 1);
1874
1875 /* set next timer thread */
d70f99e1 1876 THREAD_TIMER_ON(master, circuit->u.bc.t_send_lan_hello[0], send_lan_l1_hello,
1877 circuit, isis_jitter (circuit->hello_interval[0], IIH_JITTER));
eb5d44eb 1878
1879 return retval;
1880}
1881
1882int
1883send_lan_l2_hello (struct thread *thread)
1884{
1885 struct isis_circuit *circuit;
1886 int retval;
1887
1888 circuit = THREAD_ARG (thread);
1889 assert (circuit);
1890 circuit->u.bc.t_send_lan_hello[1] = NULL;
1891
1892 if (circuit->u.bc.run_dr_elect[1])
1893 retval = isis_dr_elect (circuit, 2);
1894
1895 retval = send_lan_hello (circuit, 2);
1896
1897 /* set next timer thread*/
d70f99e1 1898 THREAD_TIMER_ON(master, circuit->u.bc.t_send_lan_hello[1], send_lan_l2_hello,
1899 circuit, isis_jitter (circuit->hello_interval[1], IIH_JITTER));
eb5d44eb 1900
1901 return retval;
1902}
1903
1904int
1905send_p2p_hello (struct thread *thread)
1906{
1907 struct isis_circuit *circuit;
1908
1909 circuit = THREAD_ARG (thread);
1910 assert (circuit);
1911 circuit->u.p2p.t_send_p2p_hello = NULL;
1912
1913 send_hello(circuit,1);
1914
1915 /* set next timer thread*/
d70f99e1 1916 THREAD_TIMER_ON(master, circuit->u.p2p.t_send_p2p_hello, send_p2p_hello,
1917 circuit, isis_jitter (circuit->hello_interval[1], IIH_JITTER));
eb5d44eb 1918
1919 return ISIS_OK;
1920}
1921
1922int
1923build_csnp (int level, u_char *start, u_char *stop, struct list *lsps,
1924 struct isis_circuit *circuit)
1925{
1926 struct isis_fixed_hdr fixed_hdr;
1927 struct isis_passwd *passwd;
1928 int retval = ISIS_OK;
1929 unsigned long lenp;
1930 u_int16_t length;
1931
1932 if (level ==1)
1933 fill_fixed_hdr_andstream (&fixed_hdr, L1_COMPLETE_SEQ_NUM,
1934 circuit->snd_stream);
1935 else
1936 fill_fixed_hdr_andstream (&fixed_hdr, L2_COMPLETE_SEQ_NUM,
1937 circuit->snd_stream);
1938
1939 /*
1940 * Fill Level 1 or 2 Complete Sequence Numbers header
1941 */
1942
1943 lenp = stream_get_putp (circuit->snd_stream);
1944 stream_putw (circuit->snd_stream, 0); /* PDU length - when we know it */
1945 /* no need to send the source here, it is always us if we csnp */
1946 stream_put (circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
1947 /* with zero circuit id - ref 9.10, 9.11 */
1948 stream_putc (circuit->snd_stream, 0x00);
1949
1950 stream_put (circuit->snd_stream, start, ISIS_SYS_ID_LEN + 2);
1951 stream_put (circuit->snd_stream, stop, ISIS_SYS_ID_LEN + 2);
1952
1953 /*
1954 * And TLVs
1955 */
1956 if (level == 1)
1957 passwd = &circuit->area->area_passwd;
1958 else
1959 passwd = &circuit->area->domain_passwd;
1960
1961 if (passwd->type)
1962 retval = tlv_add_authinfo (passwd->type, passwd->len,
1963 passwd->passwd, circuit->snd_stream);
1964
1965 if (!retval && lsps) {
1966 retval = tlv_add_lsp_entries (lsps, circuit->snd_stream);
1967 }
1968 length = (u_int16_t)stream_get_putp (circuit->snd_stream);
1969 assert (length >= ISIS_CSNP_HDRLEN);
1970 /* Update PU length */
1971 stream_putw_at (circuit->snd_stream, lenp, length);
1972
1973 return retval;
1974}
1975
1976/*
1977 * FIXME: support multiple CSNPs
1978 */
1979
1980int
1981send_csnp (struct isis_circuit *circuit, int level)
1982{
1983 int retval = ISIS_OK;
1984 u_char start[ISIS_SYS_ID_LEN + 2];
1985 u_char stop[ISIS_SYS_ID_LEN + 2];
1986 struct list *list = NULL;
1987 struct listnode *node;
1988 struct isis_lsp *lsp;
1989
1990 memset (start,0x00, ISIS_SYS_ID_LEN + 2);
1991 memset (stop, 0xff, ISIS_SYS_ID_LEN + 2);
1992
1993 if (circuit->area->lspdb[level-1] &&
1994 dict_count (circuit->area->lspdb[level-1]) > 0) {
1995 list = list_new ();
1996 lsp_build_list (start, stop, list, circuit->area->lspdb[level-1]);
1997
1998 if (circuit->snd_stream == NULL)
1999 circuit->snd_stream = stream_new (ISO_MTU(circuit));
2000 else
2001 stream_reset (circuit->snd_stream);
2002
2003 retval = build_csnp (level, start, stop, list, circuit);
2004
2005 if (isis->debugs & DEBUG_SNP_PACKETS) {
2006 zlog_info ("ISIS-Snp (%s): Sent L%d CSNP on %s, length %ld",
2007 circuit->area->area_tag, level, circuit->interface->name,
2008 STREAM_SIZE(circuit->snd_stream));
2009 LIST_LOOP (list, lsp, node) {
2010 zlog_info("ISIS-Snp (%s): CSNP entry %s, seq 0x%08x,"
2011 " cksum 0x%04x, lifetime %us",
2012 circuit->area->area_tag,
2013 rawlspid_print (lsp->lsp_header->lsp_id),
2014 ntohl (lsp->lsp_header->seq_num),
2015 ntohs (lsp->lsp_header->checksum),
2016 ntohs (lsp->lsp_header->rem_lifetime));
2017 }
2018 }
2019
2020 list_delete (list);
2021
2022 if (retval == ISIS_OK)
2023 retval = circuit->tx (circuit, level);
2024 }
2025 return retval;
2026}
2027
2028int
2029send_l1_csnp (struct thread *thread)
2030{
2031 struct isis_circuit *circuit;
2032 int retval = ISIS_OK;
2033
2034 circuit = THREAD_ARG (thread);
2035 assert (circuit);
2036
2037 circuit->t_send_csnp[0] = NULL;
2038
2039 if (circuit->circ_type == CIRCUIT_T_BROADCAST && circuit->u.bc.is_dr[0]) {
2040 send_csnp(circuit,1);
2041 }
2042 /* set next timer thread */
d70f99e1 2043 THREAD_TIMER_ON(master, circuit->t_send_csnp[0], send_l1_csnp, circuit,
2044 isis_jitter(circuit->csnp_interval[0], CSNP_JITTER));
eb5d44eb 2045
2046 return retval;
2047}
2048
2049int
2050send_l2_csnp (struct thread *thread)
2051{
2052 struct isis_circuit *circuit;
2053 int retval = ISIS_OK;
2054
2055 circuit = THREAD_ARG (thread);
2056 assert (circuit);
2057
2058 circuit->t_send_csnp[1] = NULL;
2059
2060 if (circuit->circ_type == CIRCUIT_T_BROADCAST && circuit->u.bc.is_dr[1]) {
2061 send_csnp(circuit,2);
2062 }
2063 /* set next timer thread */
d70f99e1 2064 THREAD_TIMER_ON(master, circuit->t_send_csnp[1], send_l2_csnp, circuit,
2065 isis_jitter(circuit->csnp_interval[1], CSNP_JITTER));
2066
eb5d44eb 2067 return retval;
2068}
2069
2070int
2071build_psnp (int level, struct isis_circuit *circuit, struct list *lsps)
2072{
2073 struct isis_fixed_hdr fixed_hdr;
2074 unsigned long lenp;
2075 u_int16_t length;
2076 int retval = 0;
2077 struct isis_lsp *lsp;
2078 struct isis_passwd *passwd;
2079 struct listnode *node;
2080
2081 if (level == 1)
2082 fill_fixed_hdr_andstream (&fixed_hdr, L1_PARTIAL_SEQ_NUM,
2083 circuit->snd_stream);
2084 else
2085 fill_fixed_hdr_andstream (&fixed_hdr, L2_PARTIAL_SEQ_NUM,
2086 circuit->snd_stream);
2087
2088 /*
2089 * Fill Level 1 or 2 Partial Sequence Numbers header
2090 */
2091 lenp = stream_get_putp (circuit->snd_stream);
2092 stream_putw (circuit->snd_stream, 0); /* PDU length - when we know it */
2093 stream_put (circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
2094 stream_putc (circuit->snd_stream, circuit->idx);
2095
2096 /*
2097 * And TLVs
2098 */
2099
2100 if (level == 1)
2101 passwd = &circuit->area->area_passwd;
2102 else
2103 passwd = &circuit->area->domain_passwd;
2104
2105 if (passwd->type)
2106 retval = tlv_add_authinfo (passwd->type, passwd->len,
2107 passwd->passwd, circuit->snd_stream);
2108
2109 if (!retval && lsps) {
2110 retval = tlv_add_lsp_entries (lsps, circuit->snd_stream);
2111 }
2112
2113 if (isis->debugs & DEBUG_SNP_PACKETS) {
2114 LIST_LOOP (lsps, lsp, node) {
2115 zlog_info("ISIS-Snp (%s): PSNP entry %s, seq 0x%08x,"
2116 " cksum 0x%04x, lifetime %us",
2117 circuit->area->area_tag,
2118 rawlspid_print (lsp->lsp_header->lsp_id),
2119 ntohl (lsp->lsp_header->seq_num),
2120 ntohs (lsp->lsp_header->checksum),
2121 ntohs (lsp->lsp_header->rem_lifetime));
2122 }
2123 }
2124
2125 length = (u_int16_t)stream_get_putp (circuit->snd_stream);
2126 assert (length >= ISIS_PSNP_HDRLEN);
2127 /* Update PDU length */
2128 stream_putw_at (circuit->snd_stream, lenp, length);
2129
2130 return ISIS_OK;
2131}
2132
2133/*
2134 * 7.3.15.4 action on expiration of partial SNP interval
2135 * level 1
2136 */
2137int
2138send_psnp (int level, struct isis_circuit *circuit)
2139{
2140 int retval = ISIS_OK;
2141 struct isis_lsp *lsp;
2142 struct list *list = NULL;
2143 struct listnode *node;
2144
2145 if ((circuit->circ_type == CIRCUIT_T_BROADCAST &&
2146 !circuit->u.bc.is_dr[level - 1]) ||
2147 circuit->circ_type != CIRCUIT_T_BROADCAST) {
2148
2149 if (circuit->area->lspdb[level-1] &&
2150 dict_count (circuit->area->lspdb[level-1]) > 0) {
2151 list = list_new ();
2152 lsp_build_list_ssn (circuit, list, circuit->area->lspdb[level-1]);
2153
2154 if (listcount(list) > 0) {
2155 if (circuit->snd_stream == NULL)
2156 circuit->snd_stream = stream_new (ISO_MTU(circuit));
2157 else
2158 stream_reset (circuit->snd_stream);
2159
2160
2161 if (isis->debugs & DEBUG_SNP_PACKETS)
2162 zlog_info ("ISIS-Snp (%s): Sent L%d PSNP on %s, length %ld",
2163 circuit->area->area_tag, level, circuit->interface->name,
2164 STREAM_SIZE(circuit->snd_stream));
2165
2166 retval = build_psnp (level, circuit, list);
2167 if (retval == ISIS_OK)
2168 retval = circuit->tx (circuit, level);
2169
2170 if (retval == ISIS_OK) {
2171 /*
2172 * sending succeeded, we can clear SSN flags of this circuit
2173 * for the LSPs in list
2174 */
2175 for (node = listhead (list); node; nextnode(node)) {
2176 lsp = getdata (node);
2177 ISIS_CLEAR_FLAG (lsp->SSNflags, circuit);
2178 }
2179 }
2180 }
2181 list_delete (list);
2182 }
2183 }
2184
2185 return retval;
2186}
2187
2188int
2189send_l1_psnp (struct thread *thread)
2190{
2191
2192 struct isis_circuit *circuit;
2193 int retval = ISIS_OK;
2194
2195 circuit = THREAD_ARG (thread);
2196 assert (circuit);
2197
2198 circuit->t_send_psnp[0] = NULL;
2199
2200 send_psnp (1, circuit);
2201 /* set next timer thread */
d70f99e1 2202 THREAD_TIMER_ON(master, circuit->t_send_psnp[0], send_l1_psnp, circuit,
2203 isis_jitter(circuit->psnp_interval[0], PSNP_JITTER));
eb5d44eb 2204
2205 return retval;
2206}
2207
2208/*
2209 * 7.3.15.4 action on expiration of partial SNP interval
2210 * level 2
2211 */
2212int
2213send_l2_psnp (struct thread *thread)
2214{
2215
2216 struct isis_circuit *circuit;
2217 int retval = ISIS_OK;
2218
2219 circuit = THREAD_ARG (thread);
2220 assert (circuit);
2221
2222 circuit->t_send_psnp[1] = NULL;
2223
2224 send_psnp (2, circuit);
2225
2226 /* set next timer thread */
d70f99e1 2227 THREAD_TIMER_ON(master, circuit->t_send_psnp[1], send_l2_psnp, circuit,
2228 isis_jitter(circuit->psnp_interval[1], PSNP_JITTER));
eb5d44eb 2229
2230 return retval;
2231}
2232
2233
2234void
2235build_link_state (struct isis_lsp *lsp, struct isis_circuit *circuit,
2236 struct stream *stream)
2237{
2238 unsigned long length;
2239
2240 stream_put (stream, lsp->pdu, ntohs(lsp->lsp_header->pdu_len));
2241 length = stream_get_putp (stream);
2242
2243 return;
2244}
2245
2246
2247/*
2248 * ISO 10589 - 7.3.14.3
2249 */
2250int
2251send_lsp (struct thread *thread)
2252{
2253 struct isis_circuit *circuit;
2254 struct isis_lsp *lsp;
2255 struct listnode *node;
2256 int retval = 0;
2257
2258 circuit = THREAD_ARG (thread);
2259 assert (circuit);
2260
2261 if (circuit->state == C_STATE_UP) {
2262 node = listhead (circuit->lsp_queue);
2263 assert (node);
2264
2265 lsp = getdata (node);
2266
2267 /*
2268 * Do not send if levels do not match
2269 */
2270 if (!(lsp->level & circuit->circuit_is_type))
2271 goto dontsend;
2272
2273 /*
2274 * Do not send if we do not have adjacencies in state up on the circuit
2275 */
2276 if (circuit->upadjcount[lsp->level - 1] == 0)
2277 goto dontsend;
2278 /* only send if it needs sending */
2279 if ((time(NULL) - lsp->last_sent) >=
2280 circuit->area->lsp_gen_interval[lsp->level-1]) {
2281
2282 if (isis->debugs & DEBUG_UPDATE_PACKETS) {
2283 zlog_info ("ISIS-Upd (%s): Sent L%d LSP %s, seq 0x%08x, cksum 0x%04x,"
2284 " lifetime %us on %s",
2285 circuit->area->area_tag,
2286 lsp->level,
2287 rawlspid_print (lsp->lsp_header->lsp_id),
2288 ntohl(lsp->lsp_header->seq_num),
2289 ntohs(lsp->lsp_header->checksum),
2290 ntohs(lsp->lsp_header->rem_lifetime),
2291 circuit->interface->name);
2292 }
2293 /* copy our lsp to the send buffer */
2294 circuit->snd_stream->getp = lsp->pdu->getp;
2295 circuit->snd_stream->putp = lsp->pdu->putp;
2296 circuit->snd_stream->endp = lsp->pdu->endp;
2297 memcpy (circuit->snd_stream->data, lsp->pdu->data, lsp->pdu->endp);
2298
2299 retval = circuit->tx (circuit, lsp->level);
2300
2301 /*
2302 * If the sending succeeded, we can del the lsp from circuits lsp_queue
2303 */
2304 if (retval == ISIS_OK) {
2305 list_delete_node (circuit->lsp_queue, node);
2306
2307 /*
2308 * On broadcast circuits also the SRMflag can be cleared
2309 */
2310 if (circuit->circ_type == CIRCUIT_T_BROADCAST)
2311 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
2312
2313 if (flags_any_set (lsp->SRMflags) == 0) {
2314 /*
2315 * need to remember when we were last sent
2316 */
2317 lsp->last_sent = time (NULL);
2318 }
2319 } else {
2320 zlog_info ("sending of level %d link state failed", lsp->level);
2321 }
2322 } else {
2323 /* my belief is that if it wasn't his time, the lsp can be removed
2324 * from the queue
2325 */
2326 dontsend:
2327 list_delete_node (circuit->lsp_queue, node);
2328 }
2329#if 0
2330 /*
2331 * If there are still LSPs send next one after lsp-interval (33 msecs)
2332 */
2333 if (listcount (circuit->lsp_queue) > 0)
2334 thread_add_timer (master, send_lsp, circuit,
2335 1);
2336#endif
2337 }
2338
2339 return retval;
2340}
2341
2342int
2343ack_lsp (struct isis_link_state_hdr *hdr, struct isis_circuit *circuit,
2344 int level)
2345{
2346 unsigned long lenp;
2347 int retval;
2348 u_int16_t length;
2349 struct isis_fixed_hdr fixed_hdr;
2350
2351 if (!circuit->snd_stream)
2352 circuit->snd_stream = stream_new (ISO_MTU(circuit));
2353 else
2354 stream_reset (circuit->snd_stream);
2355
2356// fill_llc_hdr (stream);
2357 if (level == 1)
2358 fill_fixed_hdr_andstream (&fixed_hdr, L1_PARTIAL_SEQ_NUM,
2359 circuit->snd_stream);
2360 else
2361 fill_fixed_hdr_andstream (&fixed_hdr, L2_PARTIAL_SEQ_NUM,
2362 circuit->snd_stream);
2363
2364
2365 lenp = stream_get_putp (circuit->snd_stream);
2366 stream_putw (circuit->snd_stream, 0); /* PDU length */
2367 stream_put (circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
2368 stream_putc (circuit->snd_stream, circuit->idx);
2369 stream_putc (circuit->snd_stream, 9); /* code */
2370 stream_putc (circuit->snd_stream, 16); /* len */
2371
2372 stream_putw (circuit->snd_stream, ntohs(hdr->rem_lifetime));
2373 stream_put (circuit->snd_stream, hdr->lsp_id, ISIS_SYS_ID_LEN + 2);
2374 stream_putl (circuit->snd_stream, ntohl(hdr->seq_num));
2375 stream_putw (circuit->snd_stream, ntohs(hdr->checksum));
2376
2377 length = (u_int16_t)stream_get_putp (circuit->snd_stream);
2378 /* Update PDU length */
2379 stream_putw_at (circuit->snd_stream, lenp, length);
2380
2381 retval = circuit->tx (circuit, level);
2382
2383 return retval;
2384}
2385
2386#if 0
2387/*
2388 * ISH PDU Processing
2389 */
2390
2391
2392 /*
2393 * Let's first check if the local and remote system have any common area
2394 * addresses
2395 */
2396 if (area_match(tlvs.area_addrs, isis->man_area_addrs) == 0) {
2397 if (circuit->circuit_t == IS_LEVEL_2) {
2398 /* do as in table 8 (p. 40) */
2399 switch (circuit_type) {
2400 case IS_LEVEL_1:
2401 if (adj->adj_state != ISIS_ADJ_UP) {
2402 /* Reject */
2403 zlog_warn("areaMismatch");
2404 retval = ISIS_WARNING;
2405 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
2406 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch",
2407 circuit->adjdb);
2408 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2 ||
2409 adj->adj_usage == ISIS_ADJ_LEVEL2) {
2410 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System",
2411 circuit->adjdb);
2412 }
2413 break;
2414 case IS_LEVEL_2:
2415 if (adj->adj_state != ISIS_ADJ_UP) {
2416 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL, circuit->adjdb);
2417 adj->adj_usage = ISIS_ADJ_LEVEL2;
2418 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1 ||
2419 adj->adj_usage == ISIS_ADJ_LEVEL1AND2) {
2420 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System",
2421 circuit->adjdb);
2422 } else if (adj->adj_usage == ISIS_ADJ_LEVEL2) {
2423 ; /* Accept */
2424 }
2425 break;
2426 case IS_LEVEL_1_AND_2:
2427 if (adj->adj_state != ISIS_ADJ_UP) {
2428 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL, circuit->adjdb);
2429 adj->adj_usage = ISIS_ADJ_LEVEL2;
2430 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
2431 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System",
2432 circuit->adjdb);
2433 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2) {
2434 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch",
2435 circuit->adjdb);
2436 } else if (adj->adj_usage == ISIS_ADJ_LEVEL2) {
2437 ; /* Accept */
2438 }
2439 break;
2440 }
2441 goto mismatch;
2442 } else {
2443 isis_delete_adj (adj, circuit->adjdb);
2444 zlog_warn("areaMismatch");
2445 return ISIS_WARNING;
2446 }
2447 }
2448
2449mismatch:
2450#endif
2451
2452
2453
2454
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