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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; see the file COPYING; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <zebra.h>
25
26#include "memory.h"
27#include "thread.h"
28#include "linklist.h"
29#include "log.h"
30#include "stream.h"
31#include "vty.h"
32#include "hash.h"
33#include "prefix.h"
34#include "if.h"
35#include "checksum.h"
36#include "md5.h"
37#include "lib_errors.h"
38
39#include "isisd/dict.h"
40#include "isisd/isis_constants.h"
41#include "isisd/isis_common.h"
42#include "isisd/isis_flags.h"
43#include "isisd/isis_adjacency.h"
44#include "isisd/isis_circuit.h"
45#include "isisd/isis_network.h"
46#include "isisd/isis_misc.h"
47#include "isisd/isis_dr.h"
48#include "isisd/isisd.h"
49#include "isisd/isis_dynhn.h"
50#include "isisd/isis_lsp.h"
51#include "isisd/isis_pdu.h"
52#include "isisd/iso_checksum.h"
53#include "isisd/isis_csm.h"
54#include "isisd/isis_events.h"
55#include "isisd/isis_te.h"
56#include "isisd/isis_mt.h"
57#include "isisd/isis_tlvs.h"
58#include "isisd/isis_errors.h"
59#include "isisd/fabricd.h"
60#include "isisd/isis_tx_queue.h"
61#include "isisd/isis_pdu_counter.h"
62
63static int ack_lsp(struct isis_lsp_hdr *hdr, struct isis_circuit *circuit,
64 int level)
65{
66 unsigned long lenp;
67 int retval;
68 uint16_t length;
69 uint8_t pdu_type =
70 (level == IS_LEVEL_1) ? L1_PARTIAL_SEQ_NUM : L2_PARTIAL_SEQ_NUM;
71
72 isis_circuit_stream(circuit, &circuit->snd_stream);
73
74 fill_fixed_hdr(pdu_type, circuit->snd_stream);
75
76 lenp = stream_get_endp(circuit->snd_stream);
77 stream_putw(circuit->snd_stream, 0); /* PDU length */
78 stream_put(circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
79 stream_putc(circuit->snd_stream, circuit->idx);
80 stream_putc(circuit->snd_stream, 9); /* code */
81 stream_putc(circuit->snd_stream, 16); /* len */
82
83 stream_putw(circuit->snd_stream, hdr->rem_lifetime);
84 stream_put(circuit->snd_stream, hdr->lsp_id, ISIS_SYS_ID_LEN + 2);
85 stream_putl(circuit->snd_stream, hdr->seqno);
86 stream_putw(circuit->snd_stream, hdr->checksum);
87
88 length = (uint16_t)stream_get_endp(circuit->snd_stream);
89 /* Update PDU length */
90 stream_putw_at(circuit->snd_stream, lenp, length);
91
92 pdu_counter_count(circuit->area->pdu_tx_counters, pdu_type);
93 retval = circuit->tx(circuit, level);
94 if (retval != ISIS_OK)
95 flog_err(EC_ISIS_PACKET,
96 "ISIS-Upd (%s): Send L%d LSP PSNP on %s failed",
97 circuit->area->area_tag, level,
98 circuit->interface->name);
99
100 return retval;
101}
102
103/*
104 * RECEIVE SIDE
105 */
106
107struct iih_info {
108 struct isis_circuit *circuit;
109 uint8_t *ssnpa;
110 int level;
111
112 uint8_t circ_type;
113 uint8_t sys_id[ISIS_SYS_ID_LEN];
114 uint16_t holdtime;
115 uint16_t pdu_len;
116
117 uint8_t circuit_id;
118
119 uint8_t priority;
120 uint8_t dis[ISIS_SYS_ID_LEN + 1];
121
122 bool v4_usable;
123 bool v6_usable;
124
125 struct isis_tlvs *tlvs;
126};
127
128static int process_p2p_hello(struct iih_info *iih)
129{
130 struct isis_threeway_adj *tw_adj = iih->tlvs->threeway_adj;
131 if (tw_adj) {
132 if (tw_adj->state > ISIS_THREEWAY_DOWN) {
133 if (isis->debugs & DEBUG_ADJ_PACKETS) {
134 zlog_debug("ISIS-Adj (%s): Rcvd P2P IIH from (%s) with invalid three-way state: %d\n",
135 iih->circuit->area->area_tag,
136 iih->circuit->interface->name,
137 tw_adj->state);
138 }
139 return ISIS_WARNING;
140 }
141
142 if (tw_adj->neighbor_set
143 && (memcmp(tw_adj->neighbor_id, isis->sysid, ISIS_SYS_ID_LEN)
144 || tw_adj->neighbor_circuit_id != (uint32_t) iih->circuit->idx)) {
145
146 if (isis->debugs & DEBUG_ADJ_PACKETS) {
147 zlog_debug("ISIS-Adj (%s): Rcvd P2P IIH from (%s) which lists IS/Circuit different from us as neighbor.\n",
148 iih->circuit->area->area_tag,
149 iih->circuit->interface->name);
150 }
151
152 return ISIS_WARNING;
153 }
154 }
155
156 /*
157 * My interpertation of the ISO, if no adj exists we will create one for
158 * the circuit
159 */
160 struct isis_adjacency *adj = iih->circuit->u.p2p.neighbor;
161 /* If an adjacency exists, check it is with the source of the hello
162 * packets */
163 if (adj) {
164 if (memcmp(iih->sys_id, adj->sysid, ISIS_SYS_ID_LEN)) {
165 zlog_debug(
166 "hello source and adjacency do not match, set adj down\n");
167 isis_adj_state_change(adj, ISIS_ADJ_DOWN,
168 "adj do not exist");
169 return ISIS_OK;
170 }
171 }
172 if (!adj || adj->level != iih->circ_type) {
173 if (!adj) {
174 adj = isis_new_adj(iih->sys_id, NULL, iih->circ_type,
175 iih->circuit);
176 } else {
177 adj->level = iih->circ_type;
178 }
179 iih->circuit->u.p2p.neighbor = adj;
180 /* Build lsp with the new neighbor entry when a new
181 * adjacency is formed. Set adjacency circuit type to
182 * IIH PDU header circuit type before lsp is regenerated
183 * when an adjacency is up. This will result in the new
184 * adjacency entry getting added to the lsp tlv neighbor list.
185 */
186 adj->circuit_t = iih->circ_type;
187 isis_adj_state_change(adj, ISIS_ADJ_INITIALIZING, NULL);
188 adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
189 }
190
191 if (tw_adj && adj->threeway_state == ISIS_THREEWAY_DOWN)
192 adj->ext_circuit_id = tw_adj->local_circuit_id;
193
194 /* 8.2.6 Monitoring point-to-point adjacencies */
195 adj->hold_time = iih->holdtime;
196 adj->last_upd = time(NULL);
197
198 bool changed;
199 isis_tlvs_to_adj(iih->tlvs, adj, &changed);
200 changed |= tlvs_to_adj_mt_set(iih->tlvs, iih->v4_usable, iih->v6_usable,
201 adj);
202
203 /* Update MPLS TE Remote IP address parameter if possible */
204 if (IS_MPLS_TE(isisMplsTE) && iih->circuit->mtc
205 && IS_CIRCUIT_TE(iih->circuit->mtc) && adj->ipv4_address_count)
206 set_circuitparams_rmt_ipaddr(iih->circuit->mtc,
207 adj->ipv4_addresses[0]);
208
209 /* lets take care of the expiry */
210 THREAD_TIMER_OFF(adj->t_expire);
211 thread_add_timer(master, isis_adj_expire, adj, (long)adj->hold_time,
212 &adj->t_expire);
213
214 /* While fabricds initial sync is in progress, ignore hellos from other
215 * interfaces than the one we are performing the initial sync on. */
216 if (fabricd_initial_sync_is_in_progress(iih->circuit->area)
217 && fabricd_initial_sync_circuit(iih->circuit->area) != iih->circuit)
218 return ISIS_OK;
219
220 /* 8.2.5.2 a) a match was detected */
221 if (isis_tlvs_area_addresses_match(iih->tlvs,
222 iih->circuit->area->area_addrs)) {
223 /* 8.2.5.2 a) 2) If the system is L1 - table 5 */
224 if (iih->circuit->area->is_type == IS_LEVEL_1) {
225 switch (iih->circ_type) {
226 case IS_LEVEL_1:
227 case IS_LEVEL_1_AND_2:
228 if (adj->adj_state != ISIS_ADJ_UP
229 || adj->adj_usage == ISIS_ADJ_LEVEL1) {
230 isis_adj_process_threeway(adj, tw_adj,
231 ISIS_ADJ_LEVEL1);
232 }
233 break;
234 case IS_LEVEL_2:
235 if (adj->adj_state != ISIS_ADJ_UP) {
236 /* (7) reject - wrong system type event
237 */
238 zlog_warn("wrongSystemType");
239 return ISIS_WARNING;
240 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
241 /* (6) down - wrong system */
242 isis_adj_state_change(adj,
243 ISIS_ADJ_DOWN,
244 "Wrong System");
245 }
246 break;
247 }
248 }
249
250 /* 8.2.5.2 a) 3) If the system is L1L2 - table 6 */
251 if (iih->circuit->area->is_type == IS_LEVEL_1_AND_2) {
252 switch (iih->circ_type) {
253 case IS_LEVEL_1:
254 if (adj->adj_state != ISIS_ADJ_UP
255 || adj->adj_usage == ISIS_ADJ_LEVEL1) {
256 isis_adj_process_threeway(adj, tw_adj,
257 ISIS_ADJ_LEVEL1);
258 } else if ((adj->adj_usage
259 == ISIS_ADJ_LEVEL1AND2)
260 || (adj->adj_usage
261 == ISIS_ADJ_LEVEL2)) {
262 /* (8) down - wrong system */
263 isis_adj_state_change(adj,
264 ISIS_ADJ_DOWN,
265 "Wrong System");
266 }
267 break;
268 case IS_LEVEL_2:
269 if (adj->adj_state != ISIS_ADJ_UP
270 || adj->adj_usage == ISIS_ADJ_LEVEL2) {
271 isis_adj_process_threeway(adj, tw_adj,
272 ISIS_ADJ_LEVEL2);
273 } else if ((adj->adj_usage == ISIS_ADJ_LEVEL1)
274 || (adj->adj_usage
275 == ISIS_ADJ_LEVEL1AND2)) {
276 /* (8) down - wrong system */
277 isis_adj_state_change(adj,
278 ISIS_ADJ_DOWN,
279 "Wrong System");
280 }
281 break;
282 case IS_LEVEL_1_AND_2:
283 if (adj->adj_state != ISIS_ADJ_UP
284 || adj->adj_usage == ISIS_ADJ_LEVEL1AND2) {
285 isis_adj_process_threeway(adj, tw_adj,
286 ISIS_ADJ_LEVEL1AND2);
287 } else if ((adj->adj_usage == ISIS_ADJ_LEVEL1)
288 || (adj->adj_usage
289 == ISIS_ADJ_LEVEL2)) {
290 /* (8) down - wrong system */
291 isis_adj_state_change(adj,
292 ISIS_ADJ_DOWN,
293 "Wrong System");
294 }
295 break;
296 }
297 }
298
299 /* 8.2.5.2 a) 4) If the system is L2 - table 7 */
300 if (iih->circuit->area->is_type == IS_LEVEL_2) {
301 switch (iih->circ_type) {
302 case IS_LEVEL_1:
303 if (adj->adj_state != ISIS_ADJ_UP) {
304 /* (5) reject - wrong system type event
305 */
306 zlog_warn("wrongSystemType");
307 return ISIS_WARNING;
308 } else if ((adj->adj_usage
309 == ISIS_ADJ_LEVEL1AND2)
310 || (adj->adj_usage
311 == ISIS_ADJ_LEVEL2)) {
312 /* (6) down - wrong system */
313 isis_adj_state_change(adj,
314 ISIS_ADJ_DOWN,
315 "Wrong System");
316 }
317 break;
318 case IS_LEVEL_1_AND_2:
319 case IS_LEVEL_2:
320 if (adj->adj_state != ISIS_ADJ_UP
321 || adj->adj_usage == ISIS_ADJ_LEVEL2) {
322 isis_adj_process_threeway(adj, tw_adj,
323 ISIS_ADJ_LEVEL2);
324 } else if (adj->adj_usage
325 == ISIS_ADJ_LEVEL1AND2) {
326 /* (6) down - wrong system */
327 isis_adj_state_change(adj,
328 ISIS_ADJ_DOWN,
329 "Wrong System");
330 }
331 break;
332 }
333 }
334 }
335 /* 8.2.5.2 b) if no match was detected */
336 else if (listcount(iih->circuit->area->area_addrs) > 0) {
337 if (iih->circuit->area->is_type == IS_LEVEL_1) {
338 /* 8.2.5.2 b) 1) is_type L1 and adj is not up */
339 if (adj->adj_state != ISIS_ADJ_UP) {
340 isis_adj_state_change(adj, ISIS_ADJ_DOWN,
341 "Area Mismatch");
342 /* 8.2.5.2 b) 2)is_type L1 and adj is up */
343 } else {
344 isis_adj_state_change(adj, ISIS_ADJ_DOWN,
345 "Down - Area Mismatch");
346 }
347 }
348 /* 8.2.5.2 b 3 If the system is L2 or L1L2 - table 8 */
349 else {
350 switch (iih->circ_type) {
351 case IS_LEVEL_1:
352 if (adj->adj_state != ISIS_ADJ_UP) {
353 /* (6) reject - Area Mismatch event */
354 zlog_warn("AreaMismatch");
355 return ISIS_WARNING;
356 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
357 /* (7) down - area mismatch */
358 isis_adj_state_change(adj,
359 ISIS_ADJ_DOWN,
360 "Area Mismatch");
361
362 } else if ((adj->adj_usage
363 == ISIS_ADJ_LEVEL1AND2)
364 || (adj->adj_usage
365 == ISIS_ADJ_LEVEL2)) {
366 /* (7) down - wrong system */
367 isis_adj_state_change(adj,
368 ISIS_ADJ_DOWN,
369 "Wrong System");
370 }
371 break;
372 case IS_LEVEL_1_AND_2:
373 case IS_LEVEL_2:
374 if (adj->adj_state != ISIS_ADJ_UP
375 || adj->adj_usage == ISIS_ADJ_LEVEL2) {
376 isis_adj_process_threeway(adj, tw_adj,
377 ISIS_ADJ_LEVEL2);
378 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
379 /* (7) down - wrong system */
380 isis_adj_state_change(adj,
381 ISIS_ADJ_DOWN,
382 "Wrong System");
383 } else if (adj->adj_usage
384 == ISIS_ADJ_LEVEL1AND2) {
385 if (iih->circ_type == IS_LEVEL_2) {
386 /* (7) down - wrong system */
387 isis_adj_state_change(
388 adj, ISIS_ADJ_DOWN,
389 "Wrong System");
390 } else {
391 /* (7) down - area mismatch */
392 isis_adj_state_change(
393 adj, ISIS_ADJ_DOWN,
394 "Area Mismatch");
395 }
396 }
397 break;
398 }
399 }
400 } else {
401 /* down - area mismatch */
402 isis_adj_state_change(adj, ISIS_ADJ_DOWN, "Area Mismatch");
403 }
404
405 if (adj->adj_state == ISIS_ADJ_UP && changed) {
406 lsp_regenerate_schedule(adj->circuit->area,
407 isis_adj_usage2levels(adj->adj_usage),
408 0);
409 }
410
411 /* 8.2.5.2 c) if the action was up - comparing circuit IDs */
412 /* FIXME - Missing parts */
413
414 /* some of my own understanding of the ISO, why the heck does
415 * it not say what should I change the system_type to...
416 */
417 switch (adj->adj_usage) {
418 case ISIS_ADJ_LEVEL1:
419 adj->sys_type = ISIS_SYSTYPE_L1_IS;
420 break;
421 case ISIS_ADJ_LEVEL2:
422 adj->sys_type = ISIS_SYSTYPE_L2_IS;
423 break;
424 case ISIS_ADJ_LEVEL1AND2:
425 adj->sys_type = ISIS_SYSTYPE_L2_IS;
426 break;
427 case ISIS_ADJ_NONE:
428 adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
429 break;
430 }
431
432 if (isis->debugs & DEBUG_ADJ_PACKETS) {
433 zlog_debug(
434 "ISIS-Adj (%s): Rcvd P2P IIH from (%s), cir type %s,"
435 " cir id %hhu, length %" PRIu16,
436 iih->circuit->area->area_tag,
437 iih->circuit->interface->name,
438 circuit_t2string(iih->circuit->is_type),
439 iih->circuit->circuit_id, iih->pdu_len);
440 }
441
442 return ISIS_OK;
443}
444
445static int process_lan_hello(struct iih_info *iih)
446{
447 struct isis_adjacency *adj;
448 adj = isis_adj_lookup(iih->sys_id,
449 iih->circuit->u.bc.adjdb[iih->level - 1]);
450 if ((adj == NULL) || (memcmp(adj->snpa, iih->ssnpa, ETH_ALEN))
451 || (adj->level != iih->level)) {
452 if (!adj) {
453 /* Do as in 8.4.2.5 */
454 adj = isis_new_adj(iih->sys_id, iih->ssnpa, iih->level,
455 iih->circuit);
456 } else {
457 if (iih->ssnpa) {
458 memcpy(adj->snpa, iih->ssnpa, 6);
459 } else {
460 memset(adj->snpa, ' ', 6);
461 }
462 adj->level = iih->level;
463 }
464 isis_adj_state_change(adj, ISIS_ADJ_INITIALIZING, NULL);
465
466 if (iih->level == IS_LEVEL_1)
467 adj->sys_type = ISIS_SYSTYPE_L1_IS;
468 else
469 adj->sys_type = ISIS_SYSTYPE_L2_IS;
470 list_delete_all_node(
471 iih->circuit->u.bc.lan_neighs[iih->level - 1]);
472 isis_adj_build_neigh_list(
473 iih->circuit->u.bc.adjdb[iih->level - 1],
474 iih->circuit->u.bc.lan_neighs[iih->level - 1]);
475 }
476
477 if (adj->dis_record[iih->level - 1].dis == ISIS_IS_DIS) {
478 uint8_t *dis = (iih->level == 1)
479 ? iih->circuit->u.bc.l1_desig_is
480 : iih->circuit->u.bc.l2_desig_is;
481
482 if (memcmp(dis, iih->dis, ISIS_SYS_ID_LEN + 1)) {
483 thread_add_event(master, isis_event_dis_status_change,
484 iih->circuit, 0, NULL);
485 memcpy(dis, iih->dis, ISIS_SYS_ID_LEN + 1);
486 }
487 }
488
489 adj->circuit_t = iih->circ_type;
490 adj->hold_time = iih->holdtime;
491 adj->last_upd = time(NULL);
492 adj->prio[iih->level - 1] = iih->priority;
493 memcpy(adj->lanid, iih->dis, ISIS_SYS_ID_LEN + 1);
494
495 bool changed;
496 isis_tlvs_to_adj(iih->tlvs, adj, &changed);
497 changed |= tlvs_to_adj_mt_set(iih->tlvs, iih->v4_usable, iih->v6_usable,
498 adj);
499
500 /* lets take care of the expiry */
501 THREAD_TIMER_OFF(adj->t_expire);
502 thread_add_timer(master, isis_adj_expire, adj, (long)adj->hold_time,
503 &adj->t_expire);
504
505 /*
506 * If the snpa for this circuit is found from LAN Neighbours TLV
507 * we have two-way communication -> adjacency can be put to state "up"
508 */
509 bool own_snpa_found =
510 isis_tlvs_own_snpa_found(iih->tlvs, iih->circuit->u.bc.snpa);
511
512 if (adj->adj_state != ISIS_ADJ_UP) {
513 if (own_snpa_found) {
514 isis_adj_state_change(
515 adj, ISIS_ADJ_UP,
516 "own SNPA found in LAN Neighbours TLV");
517 }
518 } else {
519 if (!own_snpa_found) {
520 isis_adj_state_change(
521 adj, ISIS_ADJ_INITIALIZING,
522 "own SNPA not found in LAN Neighbours TLV");
523 }
524 }
525
526 if (adj->adj_state == ISIS_ADJ_UP && changed)
527 lsp_regenerate_schedule(adj->circuit->area, iih->level, 0);
528
529 if (isis->debugs & DEBUG_ADJ_PACKETS) {
530 zlog_debug(
531 "ISIS-Adj (%s): Rcvd L%d LAN IIH from %s on %s, cirType %s, cirID %u, length %zd",
532 iih->circuit->area->area_tag, iih->level,
533 snpa_print(iih->ssnpa), iih->circuit->interface->name,
534 circuit_t2string(iih->circuit->is_type),
535 iih->circuit->circuit_id,
536 stream_get_endp(iih->circuit->rcv_stream));
537 }
538 return ISIS_OK;
539}
540
541static int pdu_len_validate(uint16_t pdu_len, struct isis_circuit *circuit)
542{
543 if (pdu_len < stream_get_getp(circuit->rcv_stream)
544 || pdu_len > ISO_MTU(circuit)
545 || pdu_len > stream_get_endp(circuit->rcv_stream))
546 return 1;
547
548 if (pdu_len < stream_get_endp(circuit->rcv_stream))
549 stream_set_endp(circuit->rcv_stream, pdu_len);
550 return 0;
551}
552
553static int process_hello(uint8_t pdu_type, struct isis_circuit *circuit,
554 uint8_t *ssnpa)
555{
556 /* keep a copy of the raw pdu for NB notifications */
557 size_t pdu_start = stream_get_getp(circuit->rcv_stream);
558 size_t pdu_end = stream_get_endp(circuit->rcv_stream);
559 char raw_pdu[pdu_end - pdu_start];
560 bool p2p_hello = (pdu_type == P2P_HELLO);
561 int level = p2p_hello ? 0
562 : (pdu_type == L1_LAN_HELLO) ? ISIS_LEVEL1
563 : ISIS_LEVEL2;
564 const char *pdu_name =
565 p2p_hello
566 ? "P2P IIH"
567 : (level == ISIS_LEVEL1) ? "L1 LAN IIH" : "L2 LAN IIH";
568
569
570 stream_get_from(raw_pdu, circuit->rcv_stream, pdu_start,
571 pdu_end - pdu_start);
572 if (isis->debugs & DEBUG_ADJ_PACKETS) {
573 zlog_debug("ISIS-Adj (%s): Rcvd %s on %s, cirType %s, cirID %u",
574 circuit->area->area_tag, pdu_name,
575 circuit->interface->name,
576 circuit_t2string(circuit->is_type),
577 circuit->circuit_id);
578 if (isis->debugs & DEBUG_PACKET_DUMP)
579 zlog_dump_data(STREAM_DATA(circuit->rcv_stream),
580 stream_get_endp(circuit->rcv_stream));
581 }
582
583 if (p2p_hello) {
584 if (circuit->circ_type != CIRCUIT_T_P2P) {
585 zlog_warn("p2p hello on non p2p circuit");
586#ifndef FABRICD
587 isis_notif_reject_adjacency(
588 circuit, "p2p hello on non p2p circuit",
589 raw_pdu);
590#endif /* ifndef FABRICD */
591 return ISIS_WARNING;
592 }
593 } else {
594 if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
595 zlog_warn("lan hello on non broadcast circuit");
596#ifndef FABRICD
597 isis_notif_reject_adjacency(
598 circuit, "lan hello on non broadcast circuit",
599 raw_pdu);
600#endif /* ifndef FABRICD */
601 return ISIS_WARNING;
602 }
603
604 if (circuit->ext_domain) {
605 zlog_debug(
606 "level %d LAN Hello received over circuit with externalDomain = true",
607 level);
608#ifndef FABRICD
609 isis_notif_reject_adjacency(
610 circuit,
611 "LAN Hello received over circuit with externalDomain = true",
612 raw_pdu);
613#endif /* ifndef FABRICD */
614 return ISIS_WARNING;
615 }
616
617 if (!(circuit->is_type & level)) {
618 if (isis->debugs & DEBUG_ADJ_PACKETS) {
619 zlog_debug(
620 "ISIS-Adj (%s): Interface level mismatch, %s",
621 circuit->area->area_tag,
622 circuit->interface->name);
623 }
624#ifndef FABRICD
625 isis_notif_reject_adjacency(
626 circuit, "Interface level mismatch", raw_pdu);
627#endif /* ifndef FABRICD */
628 return ISIS_WARNING;
629 }
630 }
631
632 struct iih_info iih = {
633 .circuit = circuit, .ssnpa = ssnpa, .level = level};
634
635 /* Generic IIH Header */
636 iih.circ_type = stream_getc(circuit->rcv_stream) & 0x03;
637 stream_get(iih.sys_id, circuit->rcv_stream, ISIS_SYS_ID_LEN);
638 iih.holdtime = stream_getw(circuit->rcv_stream);
639 iih.pdu_len = stream_getw(circuit->rcv_stream);
640
641 if (p2p_hello) {
642 iih.circuit_id = stream_getc(circuit->rcv_stream);
643 } else {
644 iih.priority = stream_getc(circuit->rcv_stream);
645 stream_get(iih.dis, circuit->rcv_stream, ISIS_SYS_ID_LEN + 1);
646 }
647
648 if (pdu_len_validate(iih.pdu_len, circuit)) {
649 zlog_warn(
650 "ISIS-Adj (%s): Rcvd %s from (%s) with invalid pdu length %" PRIu16,
651 circuit->area->area_tag, pdu_name,
652 circuit->interface->name, iih.pdu_len);
653#ifndef FABRICD
654 isis_notif_reject_adjacency(circuit, "Invalid PDU length",
655 raw_pdu);
656#endif /* ifndef FABRICD */
657 return ISIS_WARNING;
658 }
659
660 if (!p2p_hello && !(level & iih.circ_type)) {
661 flog_err(EC_ISIS_PACKET,
662 "Level %d LAN Hello with Circuit Type %d", level,
663 iih.circ_type);
664#ifndef FABRICD
665 isis_notif_reject_adjacency(
666 circuit, "LAN Hello with wrong IS-level", raw_pdu);
667#endif /* ifndef FABRICD */
668 return ISIS_ERROR;
669 }
670
671 const char *error_log;
672 int retval = ISIS_WARNING;
673
674 if (isis_unpack_tlvs(STREAM_READABLE(circuit->rcv_stream),
675 circuit->rcv_stream, &iih.tlvs, &error_log)) {
676 zlog_warn("isis_unpack_tlvs() failed: %s", error_log);
677#ifndef FABRICD
678 isis_notif_reject_adjacency(circuit, "Failed to unpack TLVs",
679 raw_pdu);
680#endif /* ifndef FABRICD */
681 goto out;
682 }
683
684 if (!iih.tlvs->area_addresses.count) {
685 zlog_warn("No Area addresses TLV in %s", pdu_name);
686#ifndef FABRICD
687 /* send northbound notification */
688 isis_notif_area_mismatch(circuit, raw_pdu);
689#endif /* ifndef FABRICD */
690 goto out;
691 }
692
693 if (!iih.tlvs->protocols_supported.count) {
694 zlog_warn("No supported protocols TLV in %s", pdu_name);
695#ifndef FABRICD
696 isis_notif_reject_adjacency(
697 circuit, "No supported protocols TLV", raw_pdu);
698#endif /* ifndef FABRICD */
699 goto out;
700 }
701
702 int auth_code = isis_tlvs_auth_is_valid(iih.tlvs, &circuit->passwd,
703 circuit->rcv_stream, false);
704 if (auth_code != ISIS_AUTH_OK) {
705 isis_event_auth_failure(circuit->area->area_tag,
706 "IIH authentication failure",
707 iih.sys_id);
708#ifndef FABRICD
709 /* send northbound notification */
710 stream_get_from(raw_pdu, circuit->rcv_stream, pdu_start,
711 pdu_end - pdu_start);
712 if (auth_code == ISIS_AUTH_FAILURE)
713 isis_notif_authentication_failure(circuit, raw_pdu);
714 else /* AUTH_TYPE_FAILURE or NO_VALIDATOR */
715 isis_notif_authentication_type_failure(circuit,
716 raw_pdu);
717#endif /* ifndef FABRICD */
718 goto out;
719 }
720
721 if (!memcmp(iih.sys_id, isis->sysid, ISIS_SYS_ID_LEN)) {
722 zlog_warn(
723 "ISIS-Adj (%s): Received IIH with own sysid - discard",
724 circuit->area->area_tag);
725#ifndef FABRICD
726 isis_notif_reject_adjacency(
727 circuit, "Received IIH with our own sysid", raw_pdu);
728#endif /* ifndef FABRICD */
729 goto out;
730 }
731
732 if (!p2p_hello
733 && (listcount(circuit->area->area_addrs) == 0
734 || (level == ISIS_LEVEL1
735 && !isis_tlvs_area_addresses_match(
736 iih.tlvs, circuit->area->area_addrs)))) {
737 if (isis->debugs & DEBUG_ADJ_PACKETS) {
738 zlog_debug(
739 "ISIS-Adj (%s): Area mismatch, level %d IIH on %s",
740 circuit->area->area_tag, level,
741 circuit->interface->name);
742 }
743#ifndef FABRICD
744 /* send northbound notification */
745 isis_notif_area_mismatch(circuit, raw_pdu);
746#endif /* ifndef FABRICD */
747 goto out;
748 }
749
750 iih.v4_usable = (fabricd_ip_addrs(circuit)
751 && iih.tlvs->ipv4_address.count);
752
753 iih.v6_usable = (circuit->ipv6_link && listcount(circuit->ipv6_link)
754 && iih.tlvs->ipv6_address.count);
755
756 if (!iih.v4_usable && !iih.v6_usable) {
757 if (isis->debugs & DEBUG_ADJ_PACKETS) {
758 zlog_warn(
759 "ISIS-Adj (%s): Neither IPv4 nor IPv6 considered usable. Ignoring IIH",
760 circuit->area->area_tag);
761 }
762#ifndef FABRICD
763 isis_notif_reject_adjacency(
764 circuit, "Neither IPv4 not IPv6 considered usable",
765 raw_pdu);
766#endif /* ifndef FABRICD */
767 goto out;
768 }
769
770 retval = p2p_hello ? process_p2p_hello(&iih) : process_lan_hello(&iih);
771out:
772 isis_free_tlvs(iih.tlvs);
773
774 return retval;
775}
776
777static void lsp_flood_or_update(struct isis_lsp *lsp,
778 struct isis_circuit *circuit,
779 bool circuit_scoped)
780{
781 if (!circuit_scoped)
782 lsp_flood(lsp, circuit);
783 else
784 fabricd_update_lsp_no_flood(lsp, circuit);
785}
786
787/*
788 * Process Level 1/2 Link State
789 * ISO - 10589
790 * Section 7.3.15.1 - Action on receipt of a link state PDU
791 */
792static int process_lsp(uint8_t pdu_type, struct isis_circuit *circuit,
793 const uint8_t *ssnpa, uint8_t max_area_addrs)
794{
795 int level;
796 bool circuit_scoped;
797 size_t pdu_start = stream_get_getp(circuit->rcv_stream);
798 size_t pdu_end = stream_get_endp(circuit->rcv_stream);
799 char raw_pdu[pdu_end - pdu_start];
800
801 stream_get_from(raw_pdu, circuit->rcv_stream, pdu_start,
802 pdu_end - pdu_start);
803
804 if (pdu_type == FS_LINK_STATE) {
805 if (!fabricd)
806 return ISIS_ERROR;
807 if (max_area_addrs != L2_CIRCUIT_FLOODING_SCOPE)
808 return ISIS_ERROR;
809 level = ISIS_LEVEL2;
810 circuit_scoped = true;
811
812 /* The stream is used verbatim for sending out new LSPDUs.
813 * So make sure we store it as an L2 LSPDU internally.
814 * (compare for the reverse in `send_lsp`) */
815 stream_putc_at(circuit->rcv_stream, 4, L2_LINK_STATE);
816 stream_putc_at(circuit->rcv_stream, 7, 0);
817 } else {
818 if (pdu_type == L1_LINK_STATE)
819 level = ISIS_LEVEL1;
820 else
821 level = ISIS_LEVEL2;
822 circuit_scoped = false;
823 }
824
825 if (isis->debugs & DEBUG_UPDATE_PACKETS) {
826 zlog_debug(
827 "ISIS-Upd (%s): Rcvd %sL%d LSP on %s, cirType %s, cirID %u",
828 circuit->area->area_tag,
829 circuit_scoped ? "Circuit scoped " : "", level,
830 circuit->interface->name,
831 circuit_t2string(circuit->is_type),
832 circuit->circuit_id);
833 if (isis->debugs & DEBUG_PACKET_DUMP)
834 zlog_dump_data(STREAM_DATA(circuit->rcv_stream),
835 stream_get_endp(circuit->rcv_stream));
836 }
837
838 struct isis_lsp_hdr hdr = {};
839
840 hdr.pdu_len = stream_getw(circuit->rcv_stream);
841 hdr.rem_lifetime = stream_getw(circuit->rcv_stream);
842 stream_get(hdr.lsp_id, circuit->rcv_stream, sizeof(hdr.lsp_id));
843 hdr.seqno = stream_getl(circuit->rcv_stream);
844 hdr.checksum = stream_getw(circuit->rcv_stream);
845 hdr.lsp_bits = stream_getc(circuit->rcv_stream);
846
847#ifndef FABRICD
848 /* send northbound notification */
849 isis_notif_lsp_received(circuit, rawlspid_print(hdr.lsp_id), hdr.seqno,
850 time(NULL), sysid_print(hdr.lsp_id));
851#endif /* ifndef FABRICD */
852
853 if (pdu_len_validate(hdr.pdu_len, circuit)) {
854 zlog_debug("ISIS-Upd (%s): LSP %s invalid LSP length %" PRIu16,
855 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
856 hdr.pdu_len);
857 return ISIS_WARNING;
858 }
859
860 if (isis->debugs & DEBUG_UPDATE_PACKETS) {
861 zlog_debug("ISIS-Upd (%s): Rcvd L%d LSP %s, seq 0x%08" PRIx32
862 ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
863 "s, len %" PRIu16 ", on %s",
864 circuit->area->area_tag, level,
865 rawlspid_print(hdr.lsp_id), hdr.seqno, hdr.checksum,
866 hdr.rem_lifetime, hdr.pdu_len,
867 circuit->interface->name);
868 }
869
870 /* lsp is_type check */
871 if ((hdr.lsp_bits & IS_LEVEL_1) != IS_LEVEL_1) {
872 zlog_debug(
873 "ISIS-Upd (%s): LSP %s invalid LSP is type 0x%" PRIx8,
874 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
875 hdr.lsp_bits & IS_LEVEL_1_AND_2);
876 /* continue as per RFC1122 Be liberal in what you accept, and
877 * conservative in what you send */
878 }
879
880 /* Checksum sanity check - FIXME: move to correct place */
881 /* 12 = sysid+pdu+remtime */
882 if (iso_csum_verify(STREAM_DATA(circuit->rcv_stream) + 12,
883 hdr.pdu_len - 12, hdr.checksum, 12)) {
884 zlog_debug(
885 "ISIS-Upd (%s): LSP %s invalid LSP checksum 0x%04" PRIx16,
886 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
887 hdr.checksum);
888 return ISIS_WARNING;
889 }
890
891 /* 7.3.15.1 a) 1 - external domain circuit will discard lsps */
892 if (circuit->ext_domain) {
893 zlog_debug(
894 "ISIS-Upd (%s): LSP %s received at level %d over circuit with "
895 "externalDomain = true",
896 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
897 level);
898 return ISIS_WARNING;
899 }
900
901 /* 7.3.15.1 a) 2,3 - manualL2OnlyMode not implemented */
902 if (!(circuit->is_type & level)) {
903 zlog_debug(
904 "ISIS-Upd (%s): LSP %s received at level %d over circuit of"
905 " type %s",
906 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
907 level, circuit_t2string(circuit->is_type));
908 return ISIS_WARNING;
909 }
910
911 struct isis_tlvs *tlvs = NULL;
912 int retval = ISIS_WARNING;
913 const char *error_log;
914
915 if (isis_unpack_tlvs(STREAM_READABLE(circuit->rcv_stream),
916 circuit->rcv_stream, &tlvs, &error_log)) {
917 zlog_warn("Something went wrong unpacking the LSP: %s",
918 error_log);
919#ifndef FABRICD
920 /* send northbound notification. Note that the tlv-type and
921 * offset cannot correctly be set here as they are not returned
922 * by isis_unpack_tlvs, but in there I cannot fire a
923 * notification because I have no circuit information. So until
924 * we change the code above to return those extra fields, we
925 * will send dummy values which are ignored in the callback
926 */
927 isis_notif_lsp_error(circuit, rawlspid_print(hdr.lsp_id),
928 raw_pdu, 0, 0);
929#endif /* ifndef FABRICD */
930 goto out;
931 }
932
933 /* 7.3.15.1 a) 4 - need to make sure IDLength matches */
934
935 /* 7.3.15.1 a) 5 - maximum area match, can be ommited since we only use
936 * 3 */
937
938 /* 7.3.15.1 a) 7 - password check */
939 struct isis_passwd *passwd = (level == ISIS_LEVEL1)
940 ? &circuit->area->area_passwd
941 : &circuit->area->domain_passwd;
942 int auth_code = isis_tlvs_auth_is_valid(tlvs, passwd,
943 circuit->rcv_stream, true);
944 if (auth_code != ISIS_AUTH_OK) {
945 isis_event_auth_failure(circuit->area->area_tag,
946 "LSP authentication failure",
947 hdr.lsp_id);
948#ifndef FABRICD
949 /* send northbound notification */
950 if (auth_code == ISIS_AUTH_FAILURE)
951 isis_notif_authentication_failure(circuit, raw_pdu);
952 else /* AUTH_TYPE_FAILURE or NO_VALIDATOR */
953 isis_notif_authentication_type_failure(circuit,
954 raw_pdu);
955#endif /* ifndef FABRICD */
956 goto out;
957 }
958
959 /* Find the LSP in our database and compare it to this Link State header
960 */
961 struct isis_lsp *lsp =
962 lsp_search(hdr.lsp_id, circuit->area->lspdb[level - 1]);
963 int comp = 0;
964 if (lsp)
965 comp = lsp_compare(circuit->area->area_tag, lsp, hdr.seqno,
966 hdr.checksum, hdr.rem_lifetime);
967 if (lsp && (lsp->own_lsp))
968 goto dontcheckadj;
969
970 /* 7.3.15.1 a) 6 - Must check that we have an adjacency of the same
971 * level */
972 /* for broadcast circuits, snpa should be compared */
973
974 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
975 if (!isis_adj_lookup_snpa(ssnpa,
976 circuit->u.bc.adjdb[level - 1])) {
977 zlog_debug("(%s): DS ======= LSP %s, seq 0x%08" PRIx32
978 ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
979 "s on %s",
980 circuit->area->area_tag,
981 rawlspid_print(hdr.lsp_id), hdr.seqno,
982 hdr.checksum, hdr.rem_lifetime,
983 circuit->interface->name);
984 goto out; /* Silently discard */
985 }
986 }
987 /* for non broadcast, we just need to find same level adj */
988 else {
989 /* If no adj, or no sharing of level */
990 if (!circuit->u.p2p.neighbor) {
991 retval = ISIS_OK;
992 goto out;
993 } else {
994 if (((level == IS_LEVEL_1)
995 && (circuit->u.p2p.neighbor->adj_usage
996 == ISIS_ADJ_LEVEL2))
997 || ((level == IS_LEVEL_2)
998 && (circuit->u.p2p.neighbor->adj_usage
999 == ISIS_ADJ_LEVEL1)))
1000 goto out;
1001 }
1002 }
1003
1004 bool lsp_confusion;
1005
1006dontcheckadj:
1007 /* 7.3.15.1 a) 7 - Passwords for level 1 - not implemented */
1008
1009 /* 7.3.15.1 a) 8 - Passwords for level 2 - not implemented */
1010
1011 /* 7.3.15.1 a) 9 - OriginatingLSPBufferSize - not implemented FIXME: do
1012 * it */
1013
1014 /* 7.3.16.2 - If this is an LSP from another IS with identical seq_num
1015 * but
1016 * wrong checksum, initiate a purge. */
1017 if (lsp && (lsp->hdr.seqno == hdr.seqno)
1018 && (lsp->hdr.checksum != hdr.checksum)
1019 && hdr.rem_lifetime) {
1020 zlog_warn("ISIS-Upd (%s): LSP %s seq 0x%08" PRIx32
1021 " with confused checksum received.",
1022 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
1023 hdr.seqno);
1024 hdr.rem_lifetime = 0;
1025 lsp_confusion = true;
1026 } else
1027 lsp_confusion = false;
1028
1029 /* 7.3.15.1 b) - If the remaining life time is 0, we perform 7.3.16.4 */
1030 if (hdr.rem_lifetime == 0) {
1031 if (!lsp) {
1032 /* 7.3.16.4 a) 1) No LSP in db -> send an ack, but don't
1033 * save */
1034 /* only needed on explicit update, eg - p2p */
1035 if (circuit->circ_type == CIRCUIT_T_P2P)
1036 ack_lsp(&hdr, circuit, level);
1037 goto out; /* FIXME: do we need a purge? */
1038 } else {
1039 if (memcmp(hdr.lsp_id, isis->sysid, ISIS_SYS_ID_LEN)) {
1040 /* LSP by some other system -> do 7.3.16.4 b) */
1041 /* 7.3.16.4 b) 1) */
1042 if (comp == LSP_NEWER) {
1043 lsp_update(lsp, &hdr, tlvs,
1044 circuit->rcv_stream,
1045 circuit->area, level,
1046 lsp_confusion);
1047 tlvs = NULL;
1048 /* ii */
1049 lsp_flood_or_update(lsp, NULL,
1050 circuit_scoped);
1051 /* v */
1052 ISIS_FLAGS_CLEAR_ALL(
1053 lsp->SSNflags); /* FIXME:
1054 OTHER
1055 than c
1056 */
1057
1058 /* For the case of lsp confusion, flood
1059 * the purge back to its
1060 * originator so that it can react.
1061 * Otherwise, don't reflood
1062 * through incoming circuit as usual */
1063 if (!lsp_confusion) {
1064 isis_tx_queue_del(
1065 circuit->tx_queue,
1066 lsp);
1067
1068 /* iv */
1069 if (circuit->circ_type
1070 != CIRCUIT_T_BROADCAST)
1071 ISIS_SET_FLAG(
1072 lsp->SSNflags,
1073 circuit);
1074 }
1075 } /* 7.3.16.4 b) 2) */
1076 else if (comp == LSP_EQUAL) {
1077 /* i */
1078 isis_tx_queue_del(circuit->tx_queue,
1079 lsp);
1080 /* ii */
1081 if (circuit->circ_type
1082 != CIRCUIT_T_BROADCAST)
1083 ISIS_SET_FLAG(lsp->SSNflags,
1084 circuit);
1085 } /* 7.3.16.4 b) 3) */
1086 else {
1087 isis_tx_queue_add(circuit->tx_queue,
1088 lsp, TX_LSP_NORMAL);
1089 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
1090 }
1091 } else if (lsp->hdr.rem_lifetime != 0) {
1092 /* our own LSP -> 7.3.16.4 c) */
1093 if (comp == LSP_NEWER) {
1094#ifndef FABRICD
1095 if (lsp->hdr.seqno < hdr.seqno) {
1096 /* send northbound
1097 * notification */
1098 isis_notif_seqno_skipped(
1099 circuit,
1100 rawlspid_print(
1101 hdr.lsp_id));
1102 }
1103#endif /* ifndef FABRICD */
1104 lsp_inc_seqno(lsp, hdr.seqno);
1105 lsp_flood_or_update(lsp, NULL,
1106 circuit_scoped);
1107 } else {
1108 isis_tx_queue_add(circuit->tx_queue,
1109 lsp, TX_LSP_NORMAL);
1110 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
1111 }
1112 if (isis->debugs & DEBUG_UPDATE_PACKETS)
1113 zlog_debug(
1114 "ISIS-Upd (%s): (1) "
1115 "re-originating LSP %s new seq "
1116 "0x%08" PRIx32,
1117 circuit->area->area_tag,
1118 rawlspid_print(hdr.lsp_id),
1119 lsp->hdr.seqno);
1120 }
1121 }
1122 goto out;
1123 }
1124 /* 7.3.15.1 c) - If this is our own lsp and we don't have it initiate a
1125 * purge */
1126 if (memcmp(hdr.lsp_id, isis->sysid, ISIS_SYS_ID_LEN) == 0) {
1127 if (!lsp) {
1128 /* 7.3.16.4: initiate a purge */
1129 lsp_purge_non_exist(level, &hdr, circuit->area);
1130 retval = ISIS_OK;
1131 goto out;
1132 }
1133 /* 7.3.15.1 d) - If this is our own lsp and we have it */
1134
1135 /* In 7.3.16.1, If an Intermediate system R somewhere in the
1136 * domain
1137 * has information that the current sequence number for source S
1138 * is
1139 * "greater" than that held by S, ... */
1140
1141 if (comp == LSP_NEWER) {
1142 /* 7.3.16.1 */
1143 lsp_inc_seqno(lsp, hdr.seqno);
1144#ifndef FABRICD
1145 /* send northbound notification */
1146 isis_notif_seqno_skipped(circuit,
1147 rawlspid_print(hdr.lsp_id));
1148#endif /* ifndef FABRICD */
1149 if (isis->debugs & DEBUG_UPDATE_PACKETS) {
1150 zlog_debug(
1151 "ISIS-Upd (%s): (2) re-originating LSP %s new seq 0x%08" PRIx32,
1152 circuit->area->area_tag,
1153 rawlspid_print(hdr.lsp_id),
1154 lsp->hdr.seqno);
1155 }
1156 lsp_flood(lsp, NULL);
1157 } else if (comp == LSP_EQUAL) {
1158 isis_tx_queue_del(circuit->tx_queue, lsp);
1159 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1160 ISIS_SET_FLAG(lsp->SSNflags, circuit);
1161 } else {
1162 isis_tx_queue_add(circuit->tx_queue, lsp,
1163 TX_LSP_NORMAL);
1164 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
1165 }
1166 } else {
1167 /* 7.3.15.1 e) - This lsp originated on another system */
1168
1169 /* 7.3.15.1 e) 1) LSP newer than the one in db or no LSP in db
1170 */
1171 if ((!lsp || comp == LSP_NEWER)) {
1172 /*
1173 * If this lsp is a frag, need to see if we have zero
1174 * lsp present
1175 */
1176 struct isis_lsp *lsp0 = NULL;
1177 if (LSP_FRAGMENT(hdr.lsp_id) != 0) {
1178 uint8_t lspid[ISIS_SYS_ID_LEN + 2];
1179 memcpy(lspid, hdr.lsp_id, ISIS_SYS_ID_LEN + 1);
1180 LSP_FRAGMENT(lspid) = 0;
1181 lsp0 = lsp_search(
1182 lspid, circuit->area->lspdb[level - 1]);
1183 if (!lsp0) {
1184 zlog_debug(
1185 "Got lsp frag, while zero lsp not in database");
1186 goto out;
1187 }
1188 }
1189 /* i */
1190 if (!lsp) {
1191 lsp = lsp_new_from_recv(
1192 &hdr, tlvs, circuit->rcv_stream, lsp0,
1193 circuit->area, level);
1194 tlvs = NULL;
1195 lsp_insert(lsp,
1196 circuit->area->lspdb[level - 1]);
1197 } else /* exists, so we overwrite */
1198 {
1199 lsp_update(lsp, &hdr, tlvs, circuit->rcv_stream,
1200 circuit->area, level, false);
1201 tlvs = NULL;
1202 }
1203 lsp_flood_or_update(lsp, circuit, circuit_scoped);
1204
1205 /* iv */
1206 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1207 ISIS_SET_FLAG(lsp->SSNflags, circuit);
1208 /* FIXME: v) */
1209 }
1210 /* 7.3.15.1 e) 2) LSP equal to the one in db */
1211 else if (comp == LSP_EQUAL) {
1212 isis_tx_queue_del(circuit->tx_queue, lsp);
1213 lsp_update(lsp, &hdr, tlvs, circuit->rcv_stream,
1214 circuit->area, level, false);
1215 tlvs = NULL;
1216 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1217 ISIS_SET_FLAG(lsp->SSNflags, circuit);
1218 }
1219 /* 7.3.15.1 e) 3) LSP older than the one in db */
1220 else {
1221 isis_tx_queue_add(circuit->tx_queue, lsp,
1222 TX_LSP_NORMAL);
1223 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
1224 }
1225 }
1226
1227 retval = ISIS_OK;
1228
1229out:
1230 fabricd_trigger_csnp(circuit->area, circuit_scoped);
1231
1232 isis_free_tlvs(tlvs);
1233 return retval;
1234}
1235
1236/*
1237 * Process Sequence Numbers
1238 * ISO - 10589
1239 * Section 7.3.15.2 - Action on receipt of a sequence numbers PDU
1240 */
1241
1242static int process_snp(uint8_t pdu_type, struct isis_circuit *circuit,
1243 const uint8_t *ssnpa)
1244{
1245#ifndef FABRICD
1246 size_t pdu_start = stream_get_getp(circuit->rcv_stream);
1247 size_t pdu_end = stream_get_endp(circuit->rcv_stream);
1248 char raw_pdu[pdu_end - pdu_start];
1249#endif /* ifndef FABRICD */
1250
1251 bool is_csnp = (pdu_type == L1_COMPLETE_SEQ_NUM
1252 || pdu_type == L2_COMPLETE_SEQ_NUM);
1253 char typechar = is_csnp ? 'C' : 'P';
1254 int level = (pdu_type == L1_COMPLETE_SEQ_NUM
1255 || pdu_type == L1_PARTIAL_SEQ_NUM)
1256 ? ISIS_LEVEL1
1257 : ISIS_LEVEL2;
1258
1259 uint16_t pdu_len = stream_getw(circuit->rcv_stream);
1260 uint8_t rem_sys_id[ISIS_SYS_ID_LEN];
1261
1262 stream_get(rem_sys_id, circuit->rcv_stream, ISIS_SYS_ID_LEN);
1263 stream_forward_getp(circuit->rcv_stream, 1); /* Circuit ID - unused */
1264
1265 uint8_t start_lsp_id[ISIS_SYS_ID_LEN + 2] = {};
1266 uint8_t stop_lsp_id[ISIS_SYS_ID_LEN + 2] = {};
1267
1268 if (is_csnp) {
1269 stream_get(start_lsp_id, circuit->rcv_stream,
1270 ISIS_SYS_ID_LEN + 2);
1271 stream_get(stop_lsp_id, circuit->rcv_stream,
1272 ISIS_SYS_ID_LEN + 2);
1273 }
1274
1275 if (pdu_len_validate(pdu_len, circuit)) {
1276 zlog_warn("Received a CSNP with bogus length %d", pdu_len);
1277 return ISIS_WARNING;
1278 }
1279
1280 if (isis->debugs & DEBUG_SNP_PACKETS) {
1281 zlog_debug(
1282 "ISIS-Snp (%s): Rcvd L%d %cSNP on %s, cirType %s, cirID %u",
1283 circuit->area->area_tag, level, typechar,
1284 circuit->interface->name,
1285 circuit_t2string(circuit->is_type),
1286 circuit->circuit_id);
1287 if (isis->debugs & DEBUG_PACKET_DUMP)
1288 zlog_dump_data(STREAM_DATA(circuit->rcv_stream),
1289 stream_get_endp(circuit->rcv_stream));
1290 }
1291
1292 /* 7.3.15.2 a) 1 - external domain circuit will discard snp pdu */
1293 if (circuit->ext_domain) {
1294
1295 zlog_debug(
1296 "ISIS-Snp (%s): Rcvd L%d %cSNP on %s, "
1297 "skipping: circuit externalDomain = true",
1298 circuit->area->area_tag, level, typechar,
1299 circuit->interface->name);
1300
1301 return ISIS_OK;
1302 }
1303
1304 /* 7.3.15.2 a) 2,3 - manualL2OnlyMode not implemented */
1305 if (!(circuit->is_type & level)) {
1306 zlog_debug(
1307 "ISIS-Snp (%s): Rcvd L%d %cSNP on %s, "
1308 "skipping: circuit type %s does not match level %d",
1309 circuit->area->area_tag, level, typechar,
1310 circuit->interface->name,
1311 circuit_t2string(circuit->is_type), level);
1312
1313 return ISIS_OK;
1314 }
1315
1316 /* 7.3.15.2 a) 4 - not applicable for CSNP only PSNPs on broadcast */
1317 if (!is_csnp && (circuit->circ_type == CIRCUIT_T_BROADCAST)
1318 && !circuit->u.bc.is_dr[level - 1]) {
1319 zlog_debug(
1320 "ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s, "
1321 "skipping: we are not the DIS",
1322 circuit->area->area_tag, level, typechar,
1323 snpa_print(ssnpa), circuit->interface->name);
1324
1325 return ISIS_OK;
1326 }
1327
1328 /* 7.3.15.2 a) 5 - need to make sure IDLength matches - already checked
1329 */
1330
1331 /* 7.3.15.2 a) 6 - maximum area match, can be ommited since we only use
1332 * 3
1333 * - already checked */
1334
1335 /* 7.3.15.2 a) 7 - Must check that we have an adjacency of the same
1336 * level */
1337 /* for broadcast circuits, snpa should be compared */
1338 /* FIXME : Do we need to check SNPA? */
1339 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1340 if (!isis_adj_lookup(rem_sys_id,
1341 circuit->u.bc.adjdb[level - 1]))
1342 return ISIS_OK; /* Silently discard */
1343 } else {
1344 if (!fabricd && !circuit->u.p2p.neighbor) {
1345 zlog_warn("no p2p neighbor on circuit %s",
1346 circuit->interface->name);
1347 return ISIS_OK; /* Silently discard */
1348 }
1349 }
1350
1351 struct isis_tlvs *tlvs;
1352 int retval = ISIS_WARNING;
1353 const char *error_log;
1354
1355 if (isis_unpack_tlvs(STREAM_READABLE(circuit->rcv_stream),
1356 circuit->rcv_stream, &tlvs, &error_log)) {
1357 zlog_warn("Something went wrong unpacking the SNP: %s",
1358 error_log);
1359 goto out;
1360 }
1361
1362 struct isis_passwd *passwd = (level == IS_LEVEL_1)
1363 ? &circuit->area->area_passwd
1364 : &circuit->area->domain_passwd;
1365 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_RECV)) {
1366 int auth_code = isis_tlvs_auth_is_valid(
1367 tlvs, passwd, circuit->rcv_stream, false);
1368 if (auth_code != ISIS_AUTH_OK) {
1369 isis_event_auth_failure(circuit->area->area_tag,
1370 "SNP authentication failure",
1371 rem_sys_id);
1372#ifndef FABRICD
1373 /* send northbound notification */
1374 stream_get_from(raw_pdu, circuit->rcv_stream, pdu_start,
1375 pdu_end - pdu_start);
1376 if (auth_code == ISIS_AUTH_FAILURE)
1377 isis_notif_authentication_failure(circuit,
1378 raw_pdu);
1379 else /* AUTH_TYPE_FAILURE or NO_VALIDATOR */
1380 isis_notif_authentication_type_failure(circuit,
1381 raw_pdu);
1382#endif /* ifndef FABRICD */
1383 goto out;
1384 }
1385 }
1386
1387 struct isis_lsp_entry *entry_head =
1388 (struct isis_lsp_entry *)tlvs->lsp_entries.head;
1389
1390 /* debug isis snp-packets */
1391 if (isis->debugs & DEBUG_SNP_PACKETS) {
1392 zlog_debug("ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s",
1393 circuit->area->area_tag, level, typechar,
1394 snpa_print(ssnpa), circuit->interface->name);
1395 for (struct isis_lsp_entry *entry = entry_head; entry;
1396 entry = entry->next) {
1397 zlog_debug(
1398 "ISIS-Snp (%s): %cSNP entry %s, seq 0x%08" PRIx32
1399 ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16 "s",
1400 circuit->area->area_tag, typechar,
1401 rawlspid_print(entry->id), entry->seqno,
1402 entry->checksum, entry->rem_lifetime);
1403 }
1404 }
1405
1406 bool resync_needed = false;
1407
1408 /* 7.3.15.2 b) Actions on LSP_ENTRIES reported */
1409 for (struct isis_lsp_entry *entry = entry_head; entry;
1410 entry = entry->next) {
1411 struct isis_lsp *lsp =
1412 lsp_search(entry->id, circuit->area->lspdb[level - 1]);
1413 bool own_lsp = !memcmp(entry->id, isis->sysid, ISIS_SYS_ID_LEN);
1414 if (lsp) {
1415 /* 7.3.15.2 b) 1) is this LSP newer */
1416 int cmp = lsp_compare(circuit->area->area_tag, lsp,
1417 entry->seqno, entry->checksum,
1418 entry->rem_lifetime);
1419 /* 7.3.15.2 b) 2) if it equals, clear SRM on p2p */
1420 if (cmp == LSP_EQUAL) {
1421 /* if (circuit->circ_type !=
1422 * CIRCUIT_T_BROADCAST) */
1423 isis_tx_queue_del(circuit->tx_queue, lsp);
1424 }
1425 /* 7.3.15.2 b) 3) if it is older, clear SSN and set SRM
1426 */
1427 else if (cmp == LSP_OLDER) {
1428 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
1429 isis_tx_queue_add(circuit->tx_queue, lsp,
1430 TX_LSP_NORMAL);
1431 }
1432 /* 7.3.15.2 b) 4) if it is newer, set SSN and clear SRM
1433 on p2p */
1434 else {
1435 if (own_lsp) {
1436 lsp_inc_seqno(lsp, entry->seqno);
1437 isis_tx_queue_add(circuit->tx_queue, lsp,
1438 TX_LSP_NORMAL);
1439 } else {
1440 ISIS_SET_FLAG(lsp->SSNflags, circuit);
1441 /* if (circuit->circ_type !=
1442 * CIRCUIT_T_BROADCAST) */
1443 isis_tx_queue_del(circuit->tx_queue, lsp);
1444 resync_needed = true;
1445 }
1446 }
1447 } else {
1448 /* 7.3.15.2 b) 5) if it was not found, and all of those
1449 * are not 0,
1450 * insert it and set SSN on it */
1451 if (entry->rem_lifetime && entry->checksum
1452 && entry->seqno && memcmp(entry->id, isis->sysid,
1453 ISIS_SYS_ID_LEN)) {
1454 struct isis_lsp *lsp0 = NULL;
1455
1456 if (LSP_FRAGMENT(entry->id)) {
1457 uint8_t lspid[ISIS_SYS_ID_LEN + 2];
1458
1459 memcpy(lspid, entry->id,
1460 ISIS_SYS_ID_LEN + 1);
1461 LSP_FRAGMENT(lspid) = 0;
1462 lsp0 = lsp_search(
1463 lspid,
1464 circuit->area->lspdb[level - 1]);
1465 if (!lsp0) {
1466 zlog_debug("Got lsp frag in snp, while zero not in database");
1467 continue;
1468 }
1469 }
1470 lsp = lsp_new(circuit->area, entry->id,
1471 entry->rem_lifetime, 0, 0,
1472 entry->checksum, lsp0, level);
1473 lsp_insert(lsp,
1474 circuit->area->lspdb[level - 1]);
1475
1476 lsp_set_all_srmflags(lsp, false);
1477 ISIS_SET_FLAG(lsp->SSNflags, circuit);
1478 resync_needed = true;
1479 }
1480 }
1481 }
1482
1483 /* 7.3.15.2 c) on CSNP set SRM for all in range which were not reported
1484 */
1485 if (is_csnp) {
1486 /*
1487 * Build a list from our own LSP db bounded with
1488 * start_lsp_id and stop_lsp_id
1489 */
1490 struct list *lsp_list = list_new();
1491 lsp_build_list_nonzero_ht(start_lsp_id, stop_lsp_id, lsp_list,
1492 circuit->area->lspdb[level - 1]);
1493
1494 /* Fixme: Find a better solution */
1495 struct listnode *node, *nnode;
1496 struct isis_lsp *lsp;
1497 for (struct isis_lsp_entry *entry = entry_head; entry;
1498 entry = entry->next) {
1499 for (ALL_LIST_ELEMENTS(lsp_list, node, nnode, lsp)) {
1500 if (lsp_id_cmp(lsp->hdr.lsp_id, entry->id)
1501 == 0) {
1502 list_delete_node(lsp_list, node);
1503 break;
1504 }
1505 }
1506 }
1507
1508 /* on remaining LSPs we set SRM (neighbor knew not of) */
1509 for (ALL_LIST_ELEMENTS_RO(lsp_list, node, lsp)) {
1510 isis_tx_queue_add(circuit->tx_queue, lsp, TX_LSP_NORMAL);
1511 resync_needed = true;
1512 }
1513
1514 /* lets free it */
1515 list_delete(&lsp_list);
1516 }
1517
1518 if (fabricd_initial_sync_is_complete(circuit->area) && resync_needed)
1519 zlog_warn("OpenFabric: Needed to resync LSPDB using CSNP!\n");
1520
1521 retval = ISIS_OK;
1522out:
1523 isis_free_tlvs(tlvs);
1524 return retval;
1525}
1526
1527static int pdu_size(uint8_t pdu_type, uint8_t *size)
1528{
1529 switch (pdu_type) {
1530 case L1_LAN_HELLO:
1531 case L2_LAN_HELLO:
1532 *size = ISIS_LANHELLO_HDRLEN;
1533 break;
1534 case P2P_HELLO:
1535 *size = ISIS_P2PHELLO_HDRLEN;
1536 break;
1537 case L1_LINK_STATE:
1538 case L2_LINK_STATE:
1539 case FS_LINK_STATE:
1540 *size = ISIS_LSP_HDR_LEN;
1541 break;
1542 case L1_COMPLETE_SEQ_NUM:
1543 case L2_COMPLETE_SEQ_NUM:
1544 *size = ISIS_CSNP_HDRLEN;
1545 break;
1546 case L1_PARTIAL_SEQ_NUM:
1547 case L2_PARTIAL_SEQ_NUM:
1548 *size = ISIS_PSNP_HDRLEN;
1549 break;
1550 default:
1551 return 1;
1552 }
1553 *size += ISIS_FIXED_HDR_LEN;
1554 return 0;
1555}
1556
1557/*
1558 * PDU Dispatcher
1559 */
1560
1561int isis_handle_pdu(struct isis_circuit *circuit, uint8_t *ssnpa)
1562{
1563 int retval = ISIS_OK;
1564 size_t pdu_start = stream_get_getp(circuit->rcv_stream);
1565 size_t pdu_end = stream_get_endp(circuit->rcv_stream);
1566 char raw_pdu[pdu_end - pdu_start];
1567
1568 stream_get_from(raw_pdu, circuit->rcv_stream, pdu_start,
1569 pdu_end - pdu_start);
1570
1571 /* Verify that at least the 8 bytes fixed header have been received */
1572 if (stream_get_endp(circuit->rcv_stream) < ISIS_FIXED_HDR_LEN) {
1573 flog_err(EC_ISIS_PACKET, "PDU is too short to be IS-IS.");
1574 return ISIS_ERROR;
1575 }
1576
1577 uint8_t idrp = stream_getc(circuit->rcv_stream);
1578 uint8_t length = stream_getc(circuit->rcv_stream);
1579 uint8_t version1 = stream_getc(circuit->rcv_stream);
1580 uint8_t id_len = stream_getc(circuit->rcv_stream);
1581 uint8_t pdu_type = stream_getc(circuit->rcv_stream)
1582 & 0x1f; /* bits 6-8 are reserved */
1583 uint8_t version2 = stream_getc(circuit->rcv_stream);
1584
1585 stream_forward_getp(circuit->rcv_stream, 1); /* reserved */
1586 uint8_t max_area_addrs = stream_getc(circuit->rcv_stream);
1587
1588 pdu_counter_count(circuit->area->pdu_rx_counters, pdu_type);
1589
1590 if (idrp == ISO9542_ESIS) {
1591 flog_err(EC_LIB_DEVELOPMENT,
1592 "No support for ES-IS packet IDRP=%" PRIx8, idrp);
1593 return ISIS_ERROR;
1594 }
1595
1596 if (idrp != ISO10589_ISIS) {
1597 flog_err(EC_ISIS_PACKET, "Not an IS-IS packet IDRP=%" PRIx8,
1598 idrp);
1599 return ISIS_ERROR;
1600 }
1601
1602 if (version1 != 1) {
1603 zlog_warn("Unsupported ISIS version %" PRIu8, version1);
1604#ifndef FABRICD
1605 /* send northbound notification */
1606 isis_notif_version_skew(circuit, version1, raw_pdu);
1607#endif /* ifndef FABRICD */
1608 return ISIS_WARNING;
1609 }
1610
1611 if (id_len != 0 && id_len != ISIS_SYS_ID_LEN) {
1612 flog_err(
1613 EC_ISIS_PACKET,
1614 "IDFieldLengthMismatch: ID Length field in a received PDU %" PRIu8
1615 ", while the parameter for this IS is %u",
1616 id_len, ISIS_SYS_ID_LEN);
1617#ifndef FABRICD
1618 /* send northbound notification */
1619 isis_notif_id_len_mismatch(circuit, id_len, raw_pdu);
1620#endif /* ifndef FABRICD */
1621 return ISIS_ERROR;
1622 }
1623
1624 uint8_t expected_length;
1625 if (pdu_size(pdu_type, &expected_length)) {
1626 zlog_warn("Unsupported ISIS PDU %" PRIu8, pdu_type);
1627 return ISIS_WARNING;
1628 }
1629
1630 if (length != expected_length) {
1631 flog_err(EC_ISIS_PACKET,
1632 "Exepected fixed header length = %" PRIu8
1633 " but got %" PRIu8,
1634 expected_length, length);
1635 return ISIS_ERROR;
1636 }
1637
1638 if (stream_get_endp(circuit->rcv_stream) < length) {
1639 flog_err(
1640 EC_ISIS_PACKET,
1641 "PDU is too short to contain fixed header of given PDU type.");
1642 return ISIS_ERROR;
1643 }
1644
1645 if (version2 != 1) {
1646 zlog_warn("Unsupported ISIS PDU version %" PRIu8, version2);
1647#ifndef FABRICD
1648 /* send northbound notification */
1649 isis_notif_version_skew(circuit, version2, raw_pdu);
1650#endif /* ifndef FABRICD */
1651 return ISIS_WARNING;
1652 }
1653
1654 if (circuit->is_passive) {
1655 zlog_warn("Received ISIS PDU on passive circuit %s",
1656 circuit->interface->name);
1657 return ISIS_WARNING;
1658 }
1659
1660 /* either 3 or 0 */
1661 if (pdu_type != FS_LINK_STATE /* FS PDU doesn't contain max area addr field */
1662 && max_area_addrs != 0
1663 && max_area_addrs != isis->max_area_addrs) {
1664 flog_err(
1665 EC_ISIS_PACKET,
1666 "maximumAreaAddressesMismatch: maximumAreaAdresses in a received PDU %" PRIu8
1667 " while the parameter for this IS is %u",
1668 max_area_addrs, isis->max_area_addrs);
1669#ifndef FABRICD
1670 /* send northbound notification */
1671 isis_notif_max_area_addr_mismatch(circuit, max_area_addrs,
1672 raw_pdu);
1673#endif /* ifndef FABRICD */
1674 return ISIS_ERROR;
1675 }
1676
1677 switch (pdu_type) {
1678 case L1_LAN_HELLO:
1679 case L2_LAN_HELLO:
1680 case P2P_HELLO:
1681 if (fabricd && pdu_type != P2P_HELLO)
1682 return ISIS_ERROR;
1683 retval = process_hello(pdu_type, circuit, ssnpa);
1684 break;
1685 case L1_LINK_STATE:
1686 case L2_LINK_STATE:
1687 case FS_LINK_STATE:
1688 if (fabricd
1689 && pdu_type != L2_LINK_STATE
1690 && pdu_type != FS_LINK_STATE)
1691 return ISIS_ERROR;
1692 retval = process_lsp(pdu_type, circuit, ssnpa, max_area_addrs);
1693 break;
1694 case L1_COMPLETE_SEQ_NUM:
1695 case L2_COMPLETE_SEQ_NUM:
1696 case L1_PARTIAL_SEQ_NUM:
1697 case L2_PARTIAL_SEQ_NUM:
1698 retval = process_snp(pdu_type, circuit, ssnpa);
1699 break;
1700 default:
1701 return ISIS_ERROR;
1702 }
1703
1704 return retval;
1705}
1706
1707int isis_receive(struct thread *thread)
1708{
1709 struct isis_circuit *circuit;
1710 uint8_t ssnpa[ETH_ALEN];
1711 int retval;
1712
1713 /*
1714 * Get the circuit
1715 */
1716 circuit = THREAD_ARG(thread);
1717 assert(circuit);
1718
1719 circuit->t_read = NULL;
1720
1721 isis_circuit_stream(circuit, &circuit->rcv_stream);
1722
1723 retval = circuit->rx(circuit, ssnpa);
1724
1725#if ISIS_METHOD != ISIS_METHOD_BPF
1726 if (retval == ISIS_OK)
1727 retval = isis_handle_pdu(circuit, ssnpa);
1728#endif //ISIS_METHOD != ISIS_METHOD_BPF
1729
1730 /*
1731 * prepare for next packet.
1732 */
1733 if (!circuit->is_passive)
1734 isis_circuit_prepare(circuit);
1735
1736 return retval;
1737}
1738
1739/*
1740 * SEND SIDE
1741 */
1742void fill_fixed_hdr(uint8_t pdu_type, struct stream *stream)
1743{
1744 uint8_t length;
1745
1746 if (pdu_size(pdu_type, &length))
1747 assert(!"Unknown PDU Type");
1748
1749 stream_putc(stream, ISO10589_ISIS); /* IDRP */
1750 stream_putc(stream, length); /* Length of fixed header */
1751 stream_putc(stream, 1); /* Version/Protocol ID Extension 1 */
1752 stream_putc(stream, 0); /* ID Length, 0 => 6 */
1753 stream_putc(stream, pdu_type);
1754 stream_putc(stream, 1); /* Subversion */
1755 stream_putc(stream, 0); /* Reserved */
1756 stream_putc(stream, 0); /* Max Area Addresses 0 => 3 */
1757}
1758
1759static uint8_t hello_pdu_type(struct isis_circuit *circuit, int level)
1760{
1761 if (circuit->circ_type == CIRCUIT_T_BROADCAST)
1762 return (level == IS_LEVEL_1) ? L1_LAN_HELLO : L2_LAN_HELLO;
1763 else
1764 return P2P_HELLO;
1765}
1766
1767static void put_hello_hdr(struct isis_circuit *circuit, int level,
1768 size_t *len_pointer)
1769{
1770 uint8_t pdu_type = hello_pdu_type(circuit, level);
1771
1772 isis_circuit_stream(circuit, &circuit->snd_stream);
1773 fill_fixed_hdr(pdu_type, circuit->snd_stream);
1774
1775 stream_putc(circuit->snd_stream, circuit->is_type);
1776 stream_put(circuit->snd_stream, circuit->area->isis->sysid,
1777 ISIS_SYS_ID_LEN);
1778
1779 uint32_t holdtime = circuit->hello_multiplier[level - 1]
1780 * circuit->hello_interval[level - 1];
1781
1782 if (holdtime > 0xffff)
1783 holdtime = 0xffff;
1784
1785 stream_putw(circuit->snd_stream, holdtime);
1786 *len_pointer = stream_get_endp(circuit->snd_stream);
1787 stream_putw(circuit->snd_stream, 0); /* length is filled in later */
1788
1789 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1790 uint8_t *desig_is = (level == IS_LEVEL_1)
1791 ? circuit->u.bc.l1_desig_is
1792 : circuit->u.bc.l2_desig_is;
1793 stream_putc(circuit->snd_stream, circuit->priority[level - 1]);
1794 stream_put(circuit->snd_stream, desig_is, ISIS_SYS_ID_LEN + 1);
1795 } else {
1796 stream_putc(circuit->snd_stream, circuit->circuit_id);
1797 }
1798}
1799
1800int send_hello(struct isis_circuit *circuit, int level)
1801{
1802 size_t len_pointer;
1803 int retval;
1804
1805 if (circuit->is_passive)
1806 return ISIS_OK;
1807
1808 if (circuit->interface->mtu == 0) {
1809 zlog_warn("circuit has zero MTU");
1810 return ISIS_WARNING;
1811 }
1812
1813 put_hello_hdr(circuit, level, &len_pointer);
1814
1815 struct isis_tlvs *tlvs = isis_alloc_tlvs();
1816
1817 isis_tlvs_add_auth(tlvs, &circuit->passwd);
1818
1819 if (!listcount(circuit->area->area_addrs)) {
1820 isis_free_tlvs(tlvs);
1821 return ISIS_WARNING;
1822 }
1823
1824 isis_tlvs_add_area_addresses(tlvs, circuit->area->area_addrs);
1825
1826 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1827 isis_tlvs_add_lan_neighbors(
1828 tlvs, circuit->u.bc.lan_neighs[level - 1]);
1829 } else if (circuit->circ_type == CIRCUIT_T_P2P
1830 && !circuit->disable_threeway_adj) {
1831 uint32_t ext_circuit_id = circuit->idx;
1832 if (circuit->u.p2p.neighbor) {
1833 uint8_t threeway_state;
1834
1835 if (fabricd_initial_sync_is_in_progress(circuit->area)
1836 && fabricd_initial_sync_circuit(circuit->area) != circuit)
1837 threeway_state = ISIS_THREEWAY_DOWN;
1838 else
1839 threeway_state = circuit->u.p2p.neighbor->threeway_state;
1840 isis_tlvs_add_threeway_adj(tlvs,
1841 threeway_state,
1842 ext_circuit_id,
1843 circuit->u.p2p.neighbor->sysid,
1844 circuit->u.p2p.neighbor->ext_circuit_id);
1845 } else {
1846 isis_tlvs_add_threeway_adj(tlvs,
1847 ISIS_THREEWAY_DOWN,
1848 ext_circuit_id,
1849 NULL, 0);
1850 }
1851 }
1852
1853 isis_tlvs_set_protocols_supported(tlvs, &circuit->nlpids);
1854
1855 /*
1856 * MT Supported TLV
1857 *
1858 * TLV gets included if no topology is enabled on the interface,
1859 * if one topology other than #0 is enabled, or if multiple topologies
1860 * are enabled.
1861 */
1862 struct isis_circuit_mt_setting **mt_settings;
1863 unsigned int mt_count;
1864
1865 mt_settings = circuit_mt_settings(circuit, &mt_count);
1866 if (mt_count == 0 && area_is_mt(circuit->area)) {
1867 tlvs->mt_router_info_empty = true;
1868 } else if ((mt_count == 1
1869 && mt_settings[0]->mtid != ISIS_MT_IPV4_UNICAST)
1870 || (mt_count > 1)) {
1871 for (unsigned int i = 0; i < mt_count; i++)
1872 isis_tlvs_add_mt_router_info(tlvs, mt_settings[i]->mtid,
1873 false, false);
1874 }
1875
1876 if (circuit->ip_router) {
1877 struct list *circuit_ip_addrs = fabricd_ip_addrs(circuit);
1878
1879 if (circuit_ip_addrs)
1880 isis_tlvs_add_ipv4_addresses(tlvs, circuit_ip_addrs);
1881 }
1882
1883 if (circuit->ipv6_router && circuit->ipv6_link)
1884 isis_tlvs_add_ipv6_addresses(tlvs, circuit->ipv6_link);
1885
1886 if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
1887 circuit->pad_hellos, false)) {
1888 isis_free_tlvs(tlvs);
1889 return ISIS_WARNING; /* XXX: Maybe Log TLV structure? */
1890 }
1891
1892 if (isis->debugs & DEBUG_ADJ_PACKETS) {
1893 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1894 zlog_debug(
1895 "ISIS-Adj (%s): Sending L%d LAN IIH on %s, length %zd",
1896 circuit->area->area_tag, level,
1897 circuit->interface->name,
1898 stream_get_endp(circuit->snd_stream));
1899 } else {
1900 zlog_debug(
1901 "ISIS-Adj (%s): Sending P2P IIH on %s, length %zd",
1902 circuit->area->area_tag,
1903 circuit->interface->name,
1904 stream_get_endp(circuit->snd_stream));
1905 }
1906 if (isis->debugs & DEBUG_PACKET_DUMP)
1907 zlog_dump_data(STREAM_DATA(circuit->snd_stream),
1908 stream_get_endp(circuit->snd_stream));
1909 }
1910
1911 isis_free_tlvs(tlvs);
1912
1913 pdu_counter_count(circuit->area->pdu_tx_counters,
1914 hello_pdu_type(circuit, level));
1915 retval = circuit->tx(circuit, level);
1916 if (retval != ISIS_OK)
1917 flog_err(EC_ISIS_PACKET,
1918 "ISIS-Adj (%s): Send L%d IIH on %s failed",
1919 circuit->area->area_tag, level,
1920 circuit->interface->name);
1921
1922 return retval;
1923}
1924
1925static int send_hello_cb(struct thread *thread)
1926{
1927 struct isis_circuit_arg *arg = THREAD_ARG(thread);
1928 assert(arg);
1929
1930 struct isis_circuit *circuit = arg->circuit;
1931 int level = arg->level;
1932
1933 assert(circuit);
1934
1935 if (circuit->circ_type == CIRCUIT_T_P2P) {
1936 circuit->u.p2p.t_send_p2p_hello = NULL;
1937 send_hello(circuit, 1);
1938 send_hello_sched(circuit, ISIS_LEVEL1,
1939 1000 * circuit->hello_interval[1]);
1940 return ISIS_OK;
1941 }
1942
1943 if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
1944 zlog_warn("ISIS-Hello (%s): Trying to send hello on unknown circuit type %d",
1945 circuit->area->area_tag, circuit->circ_type);
1946 return ISIS_WARNING;
1947 }
1948
1949 circuit->u.bc.t_send_lan_hello[level - 1] = NULL;
1950 if (!(circuit->is_type & level)) {
1951 zlog_warn("ISIS-Hello (%s): Trying to send L%d IIH in L%d-only circuit",
1952 circuit->area->area_tag, level, 3 - level);
1953 return ISIS_WARNING;
1954 }
1955
1956 if (circuit->u.bc.run_dr_elect[level - 1])
1957 isis_dr_elect(circuit, level);
1958
1959 int rv = send_hello(circuit, level);
1960
1961 /* set next timer thread */
1962 send_hello_sched(circuit, level, 1000 * circuit->hello_interval[level - 1]);
1963 return rv;
1964}
1965
1966static void _send_hello_sched(struct isis_circuit *circuit,
1967 struct thread **threadp,
1968 int level, long delay)
1969{
1970 if (*threadp) {
1971 if (thread_timer_remain_msec(*threadp) < (unsigned long)delay)
1972 return;
1973
1974 thread_cancel(*threadp);
1975 }
1976
1977 thread_add_timer_msec(master, send_hello_cb,
1978 &circuit->level_arg[level - 1],
1979 isis_jitter(delay, IIH_JITTER),
1980 threadp);
1981}
1982
1983void send_hello_sched(struct isis_circuit *circuit, int level, long delay)
1984{
1985 if (circuit->circ_type == CIRCUIT_T_P2P) {
1986 _send_hello_sched(circuit, &circuit->u.p2p.t_send_p2p_hello,
1987 ISIS_LEVEL1, delay);
1988 return;
1989 }
1990
1991 if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
1992 zlog_warn("%s: encountered unknown circuit type %d on %s",
1993 __func__, circuit->circ_type,
1994 circuit->interface->name);
1995 return;
1996 }
1997
1998 for (int loop_level = ISIS_LEVEL1; loop_level <= ISIS_LEVEL2; loop_level++) {
1999 if (!(loop_level & level))
2000 continue;
2001
2002 _send_hello_sched(
2003 circuit,
2004 &circuit->u.bc.t_send_lan_hello[loop_level - 1],
2005 loop_level,
2006 delay
2007 );
2008 }
2009}
2010
2011
2012/*
2013 * Count the maximum number of lsps that can be accomodated by a given size.
2014 */
2015#define LSP_ENTRIES_LEN (10 + ISIS_SYS_ID_LEN)
2016static uint16_t get_max_lsp_count(uint16_t size)
2017{
2018 uint16_t tlv_count;
2019 uint16_t lsp_count;
2020 uint16_t remaining_size;
2021
2022 /* First count the full size TLVs */
2023 tlv_count = size / MAX_LSP_ENTRIES_TLV_SIZE;
2024 lsp_count = tlv_count * (MAX_LSP_ENTRIES_TLV_SIZE / LSP_ENTRIES_LEN);
2025
2026 /* The last TLV, if any */
2027 remaining_size = size % MAX_LSP_ENTRIES_TLV_SIZE;
2028 if (remaining_size - 2 >= LSP_ENTRIES_LEN)
2029 lsp_count += (remaining_size - 2) / LSP_ENTRIES_LEN;
2030
2031 return lsp_count;
2032}
2033
2034int send_csnp(struct isis_circuit *circuit, int level)
2035{
2036 if (circuit->area->lspdb[level - 1] == NULL
2037 || dict_count(circuit->area->lspdb[level - 1]) == 0)
2038 return ISIS_OK;
2039
2040 uint8_t pdu_type = (level == ISIS_LEVEL1) ? L1_COMPLETE_SEQ_NUM
2041 : L2_COMPLETE_SEQ_NUM;
2042
2043 isis_circuit_stream(circuit, &circuit->snd_stream);
2044 fill_fixed_hdr(pdu_type, circuit->snd_stream);
2045
2046 size_t len_pointer = stream_get_endp(circuit->snd_stream);
2047 stream_putw(circuit->snd_stream, 0);
2048 stream_put(circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
2049 /* with zero circuit id - ref 9.10, 9.11 */
2050 stream_putc(circuit->snd_stream, 0);
2051
2052 size_t start_pointer = stream_get_endp(circuit->snd_stream);
2053 stream_put(circuit->snd_stream, 0, ISIS_SYS_ID_LEN + 2);
2054 size_t end_pointer = stream_get_endp(circuit->snd_stream);
2055 stream_put(circuit->snd_stream, 0, ISIS_SYS_ID_LEN + 2);
2056
2057 struct isis_passwd *passwd = (level == ISIS_LEVEL1)
2058 ? &circuit->area->area_passwd
2059 : &circuit->area->domain_passwd;
2060
2061 struct isis_tlvs *tlvs = isis_alloc_tlvs();
2062
2063 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
2064 isis_tlvs_add_auth(tlvs, passwd);
2065
2066 size_t tlv_start = stream_get_endp(circuit->snd_stream);
2067 if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer, false,
2068 false)) {
2069 isis_free_tlvs(tlvs);
2070 return ISIS_WARNING;
2071 }
2072 isis_free_tlvs(tlvs);
2073
2074 uint16_t num_lsps =
2075 get_max_lsp_count(STREAM_WRITEABLE(circuit->snd_stream));
2076
2077 uint8_t start[ISIS_SYS_ID_LEN + 2];
2078 memset(start, 0x00, ISIS_SYS_ID_LEN + 2);
2079 uint8_t stop[ISIS_SYS_ID_LEN + 2];
2080 memset(stop, 0xff, ISIS_SYS_ID_LEN + 2);
2081
2082 bool loop = true;
2083 while (loop) {
2084 tlvs = isis_alloc_tlvs();
2085 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
2086 isis_tlvs_add_auth(tlvs, passwd);
2087
2088 struct isis_lsp *last_lsp;
2089 isis_tlvs_add_csnp_entries(tlvs, start, stop, num_lsps,
2090 circuit->area->lspdb[level - 1],
2091 &last_lsp);
2092 /*
2093 * Update the stop lsp_id before encoding this CSNP.
2094 */
2095 if (tlvs->lsp_entries.count < num_lsps) {
2096 memset(stop, 0xff, ISIS_SYS_ID_LEN + 2);
2097 } else {
2098 memcpy(stop, last_lsp->hdr.lsp_id, sizeof(stop));
2099 }
2100
2101 memcpy(STREAM_DATA(circuit->snd_stream) + start_pointer, start,
2102 ISIS_SYS_ID_LEN + 2);
2103 memcpy(STREAM_DATA(circuit->snd_stream) + end_pointer, stop,
2104 ISIS_SYS_ID_LEN + 2);
2105 stream_set_endp(circuit->snd_stream, tlv_start);
2106 if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
2107 false, false)) {
2108 isis_free_tlvs(tlvs);
2109 return ISIS_WARNING;
2110 }
2111
2112 if (isis->debugs & DEBUG_SNP_PACKETS) {
2113 zlog_debug(
2114 "ISIS-Snp (%s): Sending L%d CSNP on %s, length %zd",
2115 circuit->area->area_tag, level,
2116 circuit->interface->name,
2117 stream_get_endp(circuit->snd_stream));
2118 log_multiline(LOG_DEBUG, " ", "%s",
2119 isis_format_tlvs(tlvs));
2120 if (isis->debugs & DEBUG_PACKET_DUMP)
2121 zlog_dump_data(
2122 STREAM_DATA(circuit->snd_stream),
2123 stream_get_endp(circuit->snd_stream));
2124 }
2125
2126 pdu_counter_count(circuit->area->pdu_tx_counters, pdu_type);
2127 int retval = circuit->tx(circuit, level);
2128 if (retval != ISIS_OK) {
2129 flog_err(EC_ISIS_PACKET,
2130 "ISIS-Snp (%s): Send L%d CSNP on %s failed",
2131 circuit->area->area_tag, level,
2132 circuit->interface->name);
2133 isis_free_tlvs(tlvs);
2134 return retval;
2135 }
2136
2137 /*
2138 * Start lsp_id of the next CSNP should be one plus the
2139 * stop lsp_id in this current CSNP.
2140 */
2141 memcpy(start, stop, ISIS_SYS_ID_LEN + 2);
2142 loop = 0;
2143 for (int i = ISIS_SYS_ID_LEN + 1; i >= 0; --i) {
2144 if (start[i] < (uint8_t)0xff) {
2145 start[i] += 1;
2146 loop = 1;
2147 break;
2148 }
2149 }
2150 memset(stop, 0xff, ISIS_SYS_ID_LEN + 2);
2151 isis_free_tlvs(tlvs);
2152 }
2153
2154 return ISIS_OK;
2155}
2156
2157int send_l1_csnp(struct thread *thread)
2158{
2159 struct isis_circuit *circuit;
2160 int retval = ISIS_OK;
2161
2162 circuit = THREAD_ARG(thread);
2163 assert(circuit);
2164
2165 circuit->t_send_csnp[0] = NULL;
2166
2167 if ((circuit->circ_type == CIRCUIT_T_BROADCAST
2168 && circuit->u.bc.is_dr[0])
2169 || circuit->circ_type == CIRCUIT_T_P2P) {
2170 send_csnp(circuit, 1);
2171 }
2172 /* set next timer thread */
2173 thread_add_timer(master, send_l1_csnp, circuit,
2174 isis_jitter(circuit->csnp_interval[0], CSNP_JITTER),
2175 &circuit->t_send_csnp[0]);
2176
2177 return retval;
2178}
2179
2180int send_l2_csnp(struct thread *thread)
2181{
2182 struct isis_circuit *circuit;
2183 int retval = ISIS_OK;
2184
2185 circuit = THREAD_ARG(thread);
2186 assert(circuit);
2187
2188 circuit->t_send_csnp[1] = NULL;
2189
2190 if ((circuit->circ_type == CIRCUIT_T_BROADCAST
2191 && circuit->u.bc.is_dr[1])
2192 || circuit->circ_type == CIRCUIT_T_P2P) {
2193 send_csnp(circuit, 2);
2194 }
2195 /* set next timer thread */
2196 thread_add_timer(master, send_l2_csnp, circuit,
2197 isis_jitter(circuit->csnp_interval[1], CSNP_JITTER),
2198 &circuit->t_send_csnp[1]);
2199
2200 return retval;
2201}
2202
2203/*
2204 * 7.3.15.4 action on expiration of partial SNP interval
2205 * level 1
2206 */
2207static int send_psnp(int level, struct isis_circuit *circuit)
2208{
2209 if (circuit->circ_type == CIRCUIT_T_BROADCAST
2210 && circuit->u.bc.is_dr[level - 1])
2211 return ISIS_OK;
2212
2213 if (circuit->area->lspdb[level - 1] == NULL
2214 || dict_count(circuit->area->lspdb[level - 1]) == 0)
2215 return ISIS_OK;
2216
2217 if (!circuit->snd_stream)
2218 return ISIS_ERROR;
2219
2220 uint8_t pdu_type = (level == ISIS_LEVEL1) ? L1_PARTIAL_SEQ_NUM
2221 : L2_PARTIAL_SEQ_NUM;
2222
2223 isis_circuit_stream(circuit, &circuit->snd_stream);
2224 fill_fixed_hdr(pdu_type, circuit->snd_stream);
2225
2226 size_t len_pointer = stream_get_endp(circuit->snd_stream);
2227 stream_putw(circuit->snd_stream, 0); /* length is filled in later */
2228 stream_put(circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
2229 stream_putc(circuit->snd_stream, circuit->idx);
2230
2231 struct isis_passwd *passwd = (level == ISIS_LEVEL1)
2232 ? &circuit->area->area_passwd
2233 : &circuit->area->domain_passwd;
2234
2235 struct isis_tlvs *tlvs = isis_alloc_tlvs();
2236
2237 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
2238 isis_tlvs_add_auth(tlvs, passwd);
2239
2240 size_t tlv_start = stream_get_endp(circuit->snd_stream);
2241 if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer, false,
2242 false)) {
2243 isis_free_tlvs(tlvs);
2244 return ISIS_WARNING;
2245 }
2246 isis_free_tlvs(tlvs);
2247
2248 uint16_t num_lsps =
2249 get_max_lsp_count(STREAM_WRITEABLE(circuit->snd_stream));
2250
2251 while (1) {
2252 tlvs = isis_alloc_tlvs();
2253 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
2254 isis_tlvs_add_auth(tlvs, passwd);
2255
2256 for (dnode_t *dnode =
2257 dict_first(circuit->area->lspdb[level - 1]);
2258 dnode; dnode = dict_next(circuit->area->lspdb[level - 1],
2259 dnode)) {
2260 struct isis_lsp *lsp = dnode_get(dnode);
2261
2262 if (ISIS_CHECK_FLAG(lsp->SSNflags, circuit))
2263 isis_tlvs_add_lsp_entry(tlvs, lsp);
2264
2265 if (tlvs->lsp_entries.count == num_lsps)
2266 break;
2267 }
2268
2269 if (!tlvs->lsp_entries.count) {
2270 isis_free_tlvs(tlvs);
2271 return ISIS_OK;
2272 }
2273
2274 stream_set_endp(circuit->snd_stream, tlv_start);
2275 if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
2276 false, false)) {
2277 isis_free_tlvs(tlvs);
2278 return ISIS_WARNING;
2279 }
2280
2281 if (isis->debugs & DEBUG_SNP_PACKETS) {
2282 zlog_debug(
2283 "ISIS-Snp (%s): Sending L%d PSNP on %s, length %zd",
2284 circuit->area->area_tag, level,
2285 circuit->interface->name,
2286 stream_get_endp(circuit->snd_stream));
2287 log_multiline(LOG_DEBUG, " ", "%s",
2288 isis_format_tlvs(tlvs));
2289 if (isis->debugs & DEBUG_PACKET_DUMP)
2290 zlog_dump_data(
2291 STREAM_DATA(circuit->snd_stream),
2292 stream_get_endp(circuit->snd_stream));
2293 }
2294
2295 pdu_counter_count(circuit->area->pdu_tx_counters, pdu_type);
2296 int retval = circuit->tx(circuit, level);
2297 if (retval != ISIS_OK) {
2298 flog_err(EC_ISIS_PACKET,
2299 "ISIS-Snp (%s): Send L%d PSNP on %s failed",
2300 circuit->area->area_tag, level,
2301 circuit->interface->name);
2302 isis_free_tlvs(tlvs);
2303 return retval;
2304 }
2305
2306 /*
2307 * sending succeeded, we can clear SSN flags of this circuit
2308 * for the LSPs in list
2309 */
2310 struct isis_lsp_entry *entry_head;
2311 entry_head = (struct isis_lsp_entry *)tlvs->lsp_entries.head;
2312 for (struct isis_lsp_entry *entry = entry_head; entry;
2313 entry = entry->next)
2314 ISIS_CLEAR_FLAG(entry->lsp->SSNflags, circuit);
2315 isis_free_tlvs(tlvs);
2316 }
2317
2318 return ISIS_OK;
2319}
2320
2321int send_l1_psnp(struct thread *thread)
2322{
2323
2324 struct isis_circuit *circuit;
2325 int retval = ISIS_OK;
2326
2327 circuit = THREAD_ARG(thread);
2328 assert(circuit);
2329
2330 circuit->t_send_psnp[0] = NULL;
2331
2332 send_psnp(1, circuit);
2333 /* set next timer thread */
2334 thread_add_timer(master, send_l1_psnp, circuit,
2335 isis_jitter(circuit->psnp_interval[0], PSNP_JITTER),
2336 &circuit->t_send_psnp[0]);
2337
2338 return retval;
2339}
2340
2341/*
2342 * 7.3.15.4 action on expiration of partial SNP interval
2343 * level 2
2344 */
2345int send_l2_psnp(struct thread *thread)
2346{
2347 struct isis_circuit *circuit;
2348 int retval = ISIS_OK;
2349
2350 circuit = THREAD_ARG(thread);
2351 assert(circuit);
2352
2353 circuit->t_send_psnp[1] = NULL;
2354
2355 send_psnp(2, circuit);
2356
2357 /* set next timer thread */
2358 thread_add_timer(master, send_l2_psnp, circuit,
2359 isis_jitter(circuit->psnp_interval[1], PSNP_JITTER),
2360 &circuit->t_send_psnp[1]);
2361
2362 return retval;
2363}
2364
2365/*
2366 * ISO 10589 - 7.3.14.3
2367 */
2368void send_lsp(struct isis_circuit *circuit, struct isis_lsp *lsp,
2369 enum isis_tx_type tx_type)
2370{
2371 int clear_srm = 1;
2372 int retval = ISIS_OK;
2373
2374 if (circuit->state != C_STATE_UP || circuit->is_passive == 1)
2375 goto out;
2376
2377 /*
2378 * Do not send if levels do not match
2379 */
2380 if (!(lsp->level & circuit->is_type))
2381 goto out;
2382
2383 /*
2384 * Do not send if we do not have adjacencies in state up on the circuit
2385 */
2386 if (circuit->upadjcount[lsp->level - 1] == 0)
2387 goto out;
2388
2389 /* stream_copy will assert and stop program execution if LSP is larger
2390 * than
2391 * the circuit's MTU. So handle and log this case here. */
2392 if (stream_get_endp(lsp->pdu) > stream_get_size(circuit->snd_stream)) {
2393 flog_err(
2394 EC_ISIS_PACKET,
2395 "ISIS-Upd (%s): Can't send L%d LSP %s, seq 0x%08" PRIx32
2396 ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
2397 "s on %s. LSP Size is %zu while interface stream size is %zu.",
2398 circuit->area->area_tag, lsp->level,
2399 rawlspid_print(lsp->hdr.lsp_id), lsp->hdr.seqno,
2400 lsp->hdr.checksum, lsp->hdr.rem_lifetime,
2401 circuit->interface->name, stream_get_endp(lsp->pdu),
2402 stream_get_size(circuit->snd_stream));
2403#ifndef FABRICD
2404 /* send a northbound notification */
2405 isis_notif_lsp_too_large(circuit, stream_get_endp(lsp->pdu),
2406 rawlspid_print(lsp->hdr.lsp_id));
2407#endif /* ifndef FABRICD */
2408 if (isis->debugs & DEBUG_PACKET_DUMP)
2409 zlog_dump_data(STREAM_DATA(lsp->pdu),
2410 stream_get_endp(lsp->pdu));
2411 retval = ISIS_ERROR;
2412 goto out;
2413 }
2414
2415 /* copy our lsp to the send buffer */
2416 stream_copy(circuit->snd_stream, lsp->pdu);
2417
2418 if (tx_type == TX_LSP_CIRCUIT_SCOPED) {
2419 stream_putc_at(circuit->snd_stream, 4, FS_LINK_STATE);
2420 stream_putc_at(circuit->snd_stream, 7,
2421 L2_CIRCUIT_FLOODING_SCOPE);
2422 }
2423
2424 if (isis->debugs & DEBUG_UPDATE_PACKETS) {
2425 zlog_debug("ISIS-Upd (%s): Sending %sL%d LSP %s, seq 0x%08" PRIx32
2426 ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
2427 "s on %s",
2428 circuit->area->area_tag,
2429 (tx_type == TX_LSP_CIRCUIT_SCOPED)
2430 ? "Circuit scoped " : "",
2431 lsp->level,
2432 rawlspid_print(lsp->hdr.lsp_id), lsp->hdr.seqno,
2433 lsp->hdr.checksum, lsp->hdr.rem_lifetime,
2434 circuit->interface->name);
2435 if (isis->debugs & DEBUG_PACKET_DUMP)
2436 zlog_dump_data(STREAM_DATA(circuit->snd_stream),
2437 stream_get_endp(circuit->snd_stream));
2438 }
2439
2440 uint8_t pdu_type = (tx_type == TX_LSP_CIRCUIT_SCOPED) ? FS_LINK_STATE
2441 : (lsp->level == ISIS_LEVEL1) ? L1_LINK_STATE
2442 : L2_LINK_STATE;
2443
2444 clear_srm = 0;
2445 pdu_counter_count(circuit->area->pdu_tx_counters, pdu_type);
2446 retval = circuit->tx(circuit, lsp->level);
2447 if (retval != ISIS_OK) {
2448 flog_err(EC_ISIS_PACKET,
2449 "ISIS-Upd (%s): Send L%d LSP on %s failed %s",
2450 circuit->area->area_tag, lsp->level,
2451 circuit->interface->name,
2452 (retval == ISIS_WARNING) ? "temporarily"
2453 : "permanently");
2454 }
2455
2456out:
2457 if (clear_srm
2458 || (retval == ISIS_OK && circuit->circ_type == CIRCUIT_T_BROADCAST)
2459 || (retval != ISIS_OK && retval != ISIS_WARNING)) {
2460 /* SRM flag will trigger retransmission. We will not retransmit
2461 * if we
2462 * encountered a fatal error.
2463 * On success, they should only be cleared if it's a broadcast
2464 * circuit.
2465 * On a P2P circuit, we will wait for the ack from the neighbor
2466 * to clear
2467 * the fag.
2468 */
2469 isis_tx_queue_del(circuit->tx_queue, lsp);
2470 }
2471}
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