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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
62 static int ack_lsp(struct isis_lsp_hdr *hdr, struct isis_circuit *circuit,
63 int level)
64 {
65 unsigned long lenp;
66 int retval;
67 uint16_t length;
68 uint8_t pdu_type =
69 (level == IS_LEVEL_1) ? L1_PARTIAL_SEQ_NUM : L2_PARTIAL_SEQ_NUM;
70
71 isis_circuit_stream(circuit, &circuit->snd_stream);
72
73 fill_fixed_hdr(pdu_type, circuit->snd_stream);
74
75 lenp = stream_get_endp(circuit->snd_stream);
76 stream_putw(circuit->snd_stream, 0); /* PDU length */
77 stream_put(circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
78 stream_putc(circuit->snd_stream, circuit->idx);
79 stream_putc(circuit->snd_stream, 9); /* code */
80 stream_putc(circuit->snd_stream, 16); /* len */
81
82 stream_putw(circuit->snd_stream, hdr->rem_lifetime);
83 stream_put(circuit->snd_stream, hdr->lsp_id, ISIS_SYS_ID_LEN + 2);
84 stream_putl(circuit->snd_stream, hdr->seqno);
85 stream_putw(circuit->snd_stream, hdr->checksum);
86
87 length = (uint16_t)stream_get_endp(circuit->snd_stream);
88 /* Update PDU length */
89 stream_putw_at(circuit->snd_stream, lenp, length);
90
91 retval = circuit->tx(circuit, level);
92 if (retval != ISIS_OK)
93 flog_err(EC_ISIS_PACKET,
94 "ISIS-Upd (%s): Send L%d LSP PSNP on %s failed",
95 circuit->area->area_tag, level,
96 circuit->interface->name);
97
98 return retval;
99 }
100
101 /*
102 * RECEIVE SIDE
103 */
104
105 struct iih_info {
106 struct isis_circuit *circuit;
107 uint8_t *ssnpa;
108 int level;
109
110 uint8_t circ_type;
111 uint8_t sys_id[ISIS_SYS_ID_LEN];
112 uint16_t holdtime;
113 uint16_t pdu_len;
114
115 uint8_t circuit_id;
116
117 uint8_t priority;
118 uint8_t dis[ISIS_SYS_ID_LEN + 1];
119
120 bool v4_usable;
121 bool v6_usable;
122
123 struct isis_tlvs *tlvs;
124 };
125
126 static int process_p2p_hello(struct iih_info *iih)
127 {
128 struct isis_threeway_adj *tw_adj = iih->tlvs->threeway_adj;
129 if (tw_adj) {
130 if (tw_adj->state > ISIS_THREEWAY_DOWN) {
131 if (isis->debugs & DEBUG_ADJ_PACKETS) {
132 zlog_debug("ISIS-Adj (%s): Rcvd P2P IIH from (%s) with invalid three-way state: %d\n",
133 iih->circuit->area->area_tag,
134 iih->circuit->interface->name,
135 tw_adj->state);
136 }
137 return ISIS_WARNING;
138 }
139
140 if (tw_adj->neighbor_set
141 && (memcmp(tw_adj->neighbor_id, isis->sysid, ISIS_SYS_ID_LEN)
142 || tw_adj->neighbor_circuit_id != (uint32_t) iih->circuit->idx)) {
143
144 if (isis->debugs & DEBUG_ADJ_PACKETS) {
145 zlog_debug("ISIS-Adj (%s): Rcvd P2P IIH from (%s) which lists IS/Circuit different from us as neighbor.\n",
146 iih->circuit->area->area_tag,
147 iih->circuit->interface->name);
148 }
149
150 return ISIS_WARNING;
151 }
152 }
153
154 /*
155 * My interpertation of the ISO, if no adj exists we will create one for
156 * the circuit
157 */
158 struct isis_adjacency *adj = iih->circuit->u.p2p.neighbor;
159 /* If an adjacency exists, check it is with the source of the hello
160 * packets */
161 if (adj) {
162 if (memcmp(iih->sys_id, adj->sysid, ISIS_SYS_ID_LEN)) {
163 zlog_debug(
164 "hello source and adjacency do not match, set adj down\n");
165 isis_adj_state_change(adj, ISIS_ADJ_DOWN,
166 "adj do not exist");
167 return ISIS_OK;
168 }
169 }
170 if (!adj || adj->level != iih->circ_type) {
171 if (!adj) {
172 adj = isis_new_adj(iih->sys_id, NULL, iih->circ_type,
173 iih->circuit);
174 } else {
175 adj->level = iih->circ_type;
176 }
177 iih->circuit->u.p2p.neighbor = adj;
178 /* Build lsp with the new neighbor entry when a new
179 * adjacency is formed. Set adjacency circuit type to
180 * IIH PDU header circuit type before lsp is regenerated
181 * when an adjacency is up. This will result in the new
182 * adjacency entry getting added to the lsp tlv neighbor list.
183 */
184 adj->circuit_t = iih->circ_type;
185 isis_adj_state_change(adj, ISIS_ADJ_INITIALIZING, NULL);
186 adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
187 }
188
189 if (tw_adj && adj->threeway_state == ISIS_THREEWAY_DOWN)
190 adj->ext_circuit_id = tw_adj->local_circuit_id;
191
192 /* 8.2.6 Monitoring point-to-point adjacencies */
193 adj->hold_time = iih->holdtime;
194 adj->last_upd = time(NULL);
195
196 bool changed;
197 isis_tlvs_to_adj(iih->tlvs, adj, &changed);
198 changed |= tlvs_to_adj_mt_set(iih->tlvs, iih->v4_usable, iih->v6_usable,
199 adj);
200
201 /* Update MPLS TE Remote IP address parameter if possible */
202 if (IS_MPLS_TE(isisMplsTE) && iih->circuit->mtc
203 && IS_CIRCUIT_TE(iih->circuit->mtc) && adj->ipv4_address_count)
204 set_circuitparams_rmt_ipaddr(iih->circuit->mtc,
205 adj->ipv4_addresses[0]);
206
207 /* lets take care of the expiry */
208 THREAD_TIMER_OFF(adj->t_expire);
209 thread_add_timer(master, isis_adj_expire, adj, (long)adj->hold_time,
210 &adj->t_expire);
211
212 /* While fabricds initial sync is in progress, ignore hellos from other
213 * interfaces than the one we are performing the initial sync on. */
214 if (fabricd_initial_sync_is_in_progress(iih->circuit->area)
215 && fabricd_initial_sync_circuit(iih->circuit->area) != iih->circuit)
216 return ISIS_OK;
217
218 /* 8.2.5.2 a) a match was detected */
219 if (isis_tlvs_area_addresses_match(iih->tlvs,
220 iih->circuit->area->area_addrs)) {
221 /* 8.2.5.2 a) 2) If the system is L1 - table 5 */
222 if (iih->circuit->area->is_type == IS_LEVEL_1) {
223 switch (iih->circ_type) {
224 case IS_LEVEL_1:
225 case IS_LEVEL_1_AND_2:
226 if (adj->adj_state != ISIS_ADJ_UP
227 || adj->adj_usage == ISIS_ADJ_LEVEL1) {
228 isis_adj_process_threeway(adj, tw_adj,
229 ISIS_ADJ_LEVEL1);
230 }
231 break;
232 case IS_LEVEL_2:
233 if (adj->adj_state != ISIS_ADJ_UP) {
234 /* (7) reject - wrong system type event
235 */
236 zlog_warn("wrongSystemType");
237 return ISIS_WARNING;
238 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
239 /* (6) down - wrong system */
240 isis_adj_state_change(adj,
241 ISIS_ADJ_DOWN,
242 "Wrong System");
243 }
244 break;
245 }
246 }
247
248 /* 8.2.5.2 a) 3) If the system is L1L2 - table 6 */
249 if (iih->circuit->area->is_type == IS_LEVEL_1_AND_2) {
250 switch (iih->circ_type) {
251 case IS_LEVEL_1:
252 if (adj->adj_state != ISIS_ADJ_UP
253 || adj->adj_usage == ISIS_ADJ_LEVEL1) {
254 isis_adj_process_threeway(adj, tw_adj,
255 ISIS_ADJ_LEVEL1);
256 } else if ((adj->adj_usage
257 == ISIS_ADJ_LEVEL1AND2)
258 || (adj->adj_usage
259 == ISIS_ADJ_LEVEL2)) {
260 /* (8) down - wrong system */
261 isis_adj_state_change(adj,
262 ISIS_ADJ_DOWN,
263 "Wrong System");
264 }
265 break;
266 case IS_LEVEL_2:
267 if (adj->adj_state != ISIS_ADJ_UP
268 || adj->adj_usage == ISIS_ADJ_LEVEL2) {
269 isis_adj_process_threeway(adj, tw_adj,
270 ISIS_ADJ_LEVEL2);
271 } else if ((adj->adj_usage == ISIS_ADJ_LEVEL1)
272 || (adj->adj_usage
273 == ISIS_ADJ_LEVEL1AND2)) {
274 /* (8) down - wrong system */
275 isis_adj_state_change(adj,
276 ISIS_ADJ_DOWN,
277 "Wrong System");
278 }
279 break;
280 case IS_LEVEL_1_AND_2:
281 if (adj->adj_state != ISIS_ADJ_UP
282 || adj->adj_usage == ISIS_ADJ_LEVEL1AND2) {
283 isis_adj_process_threeway(adj, tw_adj,
284 ISIS_ADJ_LEVEL1AND2);
285 } else if ((adj->adj_usage == ISIS_ADJ_LEVEL1)
286 || (adj->adj_usage
287 == ISIS_ADJ_LEVEL2)) {
288 /* (8) down - wrong system */
289 isis_adj_state_change(adj,
290 ISIS_ADJ_DOWN,
291 "Wrong System");
292 }
293 break;
294 }
295 }
296
297 /* 8.2.5.2 a) 4) If the system is L2 - table 7 */
298 if (iih->circuit->area->is_type == IS_LEVEL_2) {
299 switch (iih->circ_type) {
300 case IS_LEVEL_1:
301 if (adj->adj_state != ISIS_ADJ_UP) {
302 /* (5) reject - wrong system type event
303 */
304 zlog_warn("wrongSystemType");
305 return ISIS_WARNING;
306 } else if ((adj->adj_usage
307 == ISIS_ADJ_LEVEL1AND2)
308 || (adj->adj_usage
309 == ISIS_ADJ_LEVEL2)) {
310 /* (6) down - wrong system */
311 isis_adj_state_change(adj,
312 ISIS_ADJ_DOWN,
313 "Wrong System");
314 }
315 break;
316 case IS_LEVEL_1_AND_2:
317 case IS_LEVEL_2:
318 if (adj->adj_state != ISIS_ADJ_UP
319 || adj->adj_usage == ISIS_ADJ_LEVEL2) {
320 isis_adj_process_threeway(adj, tw_adj,
321 ISIS_ADJ_LEVEL2);
322 } else if (adj->adj_usage
323 == ISIS_ADJ_LEVEL1AND2) {
324 /* (6) down - wrong system */
325 isis_adj_state_change(adj,
326 ISIS_ADJ_DOWN,
327 "Wrong System");
328 }
329 break;
330 }
331 }
332 }
333 /* 8.2.5.2 b) if no match was detected */
334 else if (listcount(iih->circuit->area->area_addrs) > 0) {
335 if (iih->circuit->area->is_type == IS_LEVEL_1) {
336 /* 8.2.5.2 b) 1) is_type L1 and adj is not up */
337 if (adj->adj_state != ISIS_ADJ_UP) {
338 isis_adj_state_change(adj, ISIS_ADJ_DOWN,
339 "Area Mismatch");
340 /* 8.2.5.2 b) 2)is_type L1 and adj is up */
341 } else {
342 isis_adj_state_change(adj, ISIS_ADJ_DOWN,
343 "Down - Area Mismatch");
344 }
345 }
346 /* 8.2.5.2 b 3 If the system is L2 or L1L2 - table 8 */
347 else {
348 switch (iih->circ_type) {
349 case IS_LEVEL_1:
350 if (adj->adj_state != ISIS_ADJ_UP) {
351 /* (6) reject - Area Mismatch event */
352 zlog_warn("AreaMismatch");
353 return ISIS_WARNING;
354 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
355 /* (7) down - area mismatch */
356 isis_adj_state_change(adj,
357 ISIS_ADJ_DOWN,
358 "Area Mismatch");
359
360 } else if ((adj->adj_usage
361 == ISIS_ADJ_LEVEL1AND2)
362 || (adj->adj_usage
363 == ISIS_ADJ_LEVEL2)) {
364 /* (7) down - wrong system */
365 isis_adj_state_change(adj,
366 ISIS_ADJ_DOWN,
367 "Wrong System");
368 }
369 break;
370 case IS_LEVEL_1_AND_2:
371 case IS_LEVEL_2:
372 if (adj->adj_state != ISIS_ADJ_UP
373 || adj->adj_usage == ISIS_ADJ_LEVEL2) {
374 isis_adj_process_threeway(adj, tw_adj,
375 ISIS_ADJ_LEVEL2);
376 } else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
377 /* (7) down - wrong system */
378 isis_adj_state_change(adj,
379 ISIS_ADJ_DOWN,
380 "Wrong System");
381 } else if (adj->adj_usage
382 == ISIS_ADJ_LEVEL1AND2) {
383 if (iih->circ_type == IS_LEVEL_2) {
384 /* (7) down - wrong system */
385 isis_adj_state_change(
386 adj, ISIS_ADJ_DOWN,
387 "Wrong System");
388 } else {
389 /* (7) down - area mismatch */
390 isis_adj_state_change(
391 adj, ISIS_ADJ_DOWN,
392 "Area Mismatch");
393 }
394 }
395 break;
396 }
397 }
398 } else {
399 /* down - area mismatch */
400 isis_adj_state_change(adj, ISIS_ADJ_DOWN, "Area Mismatch");
401 }
402
403 if (adj->adj_state == ISIS_ADJ_UP && changed) {
404 lsp_regenerate_schedule(adj->circuit->area,
405 isis_adj_usage2levels(adj->adj_usage),
406 0);
407 }
408
409 /* 8.2.5.2 c) if the action was up - comparing circuit IDs */
410 /* FIXME - Missing parts */
411
412 /* some of my own understanding of the ISO, why the heck does
413 * it not say what should I change the system_type to...
414 */
415 switch (adj->adj_usage) {
416 case ISIS_ADJ_LEVEL1:
417 adj->sys_type = ISIS_SYSTYPE_L1_IS;
418 break;
419 case ISIS_ADJ_LEVEL2:
420 adj->sys_type = ISIS_SYSTYPE_L2_IS;
421 break;
422 case ISIS_ADJ_LEVEL1AND2:
423 adj->sys_type = ISIS_SYSTYPE_L2_IS;
424 break;
425 case ISIS_ADJ_NONE:
426 adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
427 break;
428 }
429
430 if (isis->debugs & DEBUG_ADJ_PACKETS) {
431 zlog_debug(
432 "ISIS-Adj (%s): Rcvd P2P IIH from (%s), cir type %s,"
433 " cir id %hhu, length %" PRIu16,
434 iih->circuit->area->area_tag,
435 iih->circuit->interface->name,
436 circuit_t2string(iih->circuit->is_type),
437 iih->circuit->circuit_id, iih->pdu_len);
438 }
439
440 return ISIS_OK;
441 }
442
443 static int process_lan_hello(struct iih_info *iih)
444 {
445 struct isis_adjacency *adj;
446 adj = isis_adj_lookup(iih->sys_id,
447 iih->circuit->u.bc.adjdb[iih->level - 1]);
448 if ((adj == NULL) || (memcmp(adj->snpa, iih->ssnpa, ETH_ALEN))
449 || (adj->level != iih->level)) {
450 if (!adj) {
451 /* Do as in 8.4.2.5 */
452 adj = isis_new_adj(iih->sys_id, iih->ssnpa, iih->level,
453 iih->circuit);
454 } else {
455 if (iih->ssnpa) {
456 memcpy(adj->snpa, iih->ssnpa, 6);
457 } else {
458 memset(adj->snpa, ' ', 6);
459 }
460 adj->level = iih->level;
461 }
462 isis_adj_state_change(adj, ISIS_ADJ_INITIALIZING, NULL);
463
464 if (iih->level == IS_LEVEL_1)
465 adj->sys_type = ISIS_SYSTYPE_L1_IS;
466 else
467 adj->sys_type = ISIS_SYSTYPE_L2_IS;
468 list_delete_all_node(
469 iih->circuit->u.bc.lan_neighs[iih->level - 1]);
470 isis_adj_build_neigh_list(
471 iih->circuit->u.bc.adjdb[iih->level - 1],
472 iih->circuit->u.bc.lan_neighs[iih->level - 1]);
473 }
474
475 if (adj->dis_record[iih->level - 1].dis == ISIS_IS_DIS) {
476 uint8_t *dis = (iih->level == 1)
477 ? iih->circuit->u.bc.l1_desig_is
478 : iih->circuit->u.bc.l2_desig_is;
479
480 if (memcmp(dis, iih->dis, ISIS_SYS_ID_LEN + 1)) {
481 thread_add_event(master, isis_event_dis_status_change,
482 iih->circuit, 0, NULL);
483 memcpy(dis, iih->dis, ISIS_SYS_ID_LEN + 1);
484 }
485 }
486
487 adj->circuit_t = iih->circ_type;
488 adj->hold_time = iih->holdtime;
489 adj->last_upd = time(NULL);
490 adj->prio[iih->level - 1] = iih->priority;
491 memcpy(adj->lanid, iih->dis, ISIS_SYS_ID_LEN + 1);
492
493 bool changed;
494 isis_tlvs_to_adj(iih->tlvs, adj, &changed);
495 changed |= tlvs_to_adj_mt_set(iih->tlvs, iih->v4_usable, iih->v6_usable,
496 adj);
497
498 /* lets take care of the expiry */
499 THREAD_TIMER_OFF(adj->t_expire);
500 thread_add_timer(master, isis_adj_expire, adj, (long)adj->hold_time,
501 &adj->t_expire);
502
503 /*
504 * If the snpa for this circuit is found from LAN Neighbours TLV
505 * we have two-way communication -> adjacency can be put to state "up"
506 */
507 bool own_snpa_found =
508 isis_tlvs_own_snpa_found(iih->tlvs, iih->circuit->u.bc.snpa);
509
510 if (adj->adj_state != ISIS_ADJ_UP) {
511 if (own_snpa_found) {
512 isis_adj_state_change(
513 adj, ISIS_ADJ_UP,
514 "own SNPA found in LAN Neighbours TLV");
515 }
516 } else {
517 if (!own_snpa_found) {
518 isis_adj_state_change(
519 adj, ISIS_ADJ_INITIALIZING,
520 "own SNPA not found in LAN Neighbours TLV");
521 }
522 }
523
524 if (adj->adj_state == ISIS_ADJ_UP && changed)
525 lsp_regenerate_schedule(adj->circuit->area, iih->level, 0);
526
527 if (isis->debugs & DEBUG_ADJ_PACKETS) {
528 zlog_debug(
529 "ISIS-Adj (%s): Rcvd L%d LAN IIH from %s on %s, cirType %s, cirID %u, length %zd",
530 iih->circuit->area->area_tag, iih->level,
531 snpa_print(iih->ssnpa), iih->circuit->interface->name,
532 circuit_t2string(iih->circuit->is_type),
533 iih->circuit->circuit_id,
534 stream_get_endp(iih->circuit->rcv_stream));
535 }
536 return ISIS_OK;
537 }
538
539 static int pdu_len_validate(uint16_t pdu_len, struct isis_circuit *circuit)
540 {
541 if (pdu_len < stream_get_getp(circuit->rcv_stream)
542 || pdu_len > ISO_MTU(circuit)
543 || pdu_len > stream_get_endp(circuit->rcv_stream))
544 return 1;
545
546 if (pdu_len < stream_get_endp(circuit->rcv_stream))
547 stream_set_endp(circuit->rcv_stream, pdu_len);
548 return 0;
549 }
550
551 static int process_hello(uint8_t pdu_type, struct isis_circuit *circuit,
552 uint8_t *ssnpa)
553 {
554 bool p2p_hello = (pdu_type == P2P_HELLO);
555 int level = p2p_hello ? 0
556 : (pdu_type == L1_LAN_HELLO) ? ISIS_LEVEL1
557 : ISIS_LEVEL2;
558 const char *pdu_name =
559 p2p_hello
560 ? "P2P IIH"
561 : (level == ISIS_LEVEL1) ? "L1 LAN IIH" : "L2 LAN IIH";
562
563 if (isis->debugs & DEBUG_ADJ_PACKETS) {
564 zlog_debug("ISIS-Adj (%s): Rcvd %s on %s, cirType %s, cirID %u",
565 circuit->area->area_tag, pdu_name,
566 circuit->interface->name,
567 circuit_t2string(circuit->is_type),
568 circuit->circuit_id);
569 if (isis->debugs & DEBUG_PACKET_DUMP)
570 zlog_dump_data(STREAM_DATA(circuit->rcv_stream),
571 stream_get_endp(circuit->rcv_stream));
572 }
573
574 if (p2p_hello) {
575 if (circuit->circ_type != CIRCUIT_T_P2P) {
576 zlog_warn("p2p hello on non p2p circuit");
577 return ISIS_WARNING;
578 }
579 } else {
580 if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
581 zlog_warn("lan hello on non broadcast circuit");
582 return ISIS_WARNING;
583 }
584
585 if (circuit->ext_domain) {
586 zlog_debug(
587 "level %d LAN Hello received over circuit with externalDomain = true",
588 level);
589 return ISIS_WARNING;
590 }
591
592 if (!(circuit->is_type & level)) {
593 if (isis->debugs & DEBUG_ADJ_PACKETS) {
594 zlog_debug(
595 "ISIS-Adj (%s): Interface level mismatch, %s",
596 circuit->area->area_tag,
597 circuit->interface->name);
598 }
599 return ISIS_WARNING;
600 }
601 }
602
603 struct iih_info iih = {
604 .circuit = circuit, .ssnpa = ssnpa, .level = level};
605
606 /* Generic IIH Header */
607 iih.circ_type = stream_getc(circuit->rcv_stream) & 0x03;
608 stream_get(iih.sys_id, circuit->rcv_stream, ISIS_SYS_ID_LEN);
609 iih.holdtime = stream_getw(circuit->rcv_stream);
610 iih.pdu_len = stream_getw(circuit->rcv_stream);
611
612 if (p2p_hello) {
613 iih.circuit_id = stream_getc(circuit->rcv_stream);
614 } else {
615 iih.priority = stream_getc(circuit->rcv_stream);
616 stream_get(iih.dis, circuit->rcv_stream, ISIS_SYS_ID_LEN + 1);
617 }
618
619 if (pdu_len_validate(iih.pdu_len, circuit)) {
620 zlog_warn(
621 "ISIS-Adj (%s): Rcvd %s from (%s) with invalid pdu length %" PRIu16,
622 circuit->area->area_tag, pdu_name,
623 circuit->interface->name, iih.pdu_len);
624 return ISIS_WARNING;
625 }
626
627 if (!p2p_hello && !(level & iih.circ_type)) {
628 flog_err(EC_ISIS_PACKET,
629 "Level %d LAN Hello with Circuit Type %d", level,
630 iih.circ_type);
631 return ISIS_ERROR;
632 }
633
634 const char *error_log;
635 int retval = ISIS_WARNING;
636
637 if (isis_unpack_tlvs(STREAM_READABLE(circuit->rcv_stream),
638 circuit->rcv_stream, &iih.tlvs, &error_log)) {
639 zlog_warn("isis_unpack_tlvs() failed: %s", error_log);
640 goto out;
641 }
642
643 if (!iih.tlvs->area_addresses.count) {
644 zlog_warn("No Area addresses TLV in %s", pdu_name);
645 goto out;
646 }
647
648 if (!iih.tlvs->protocols_supported.count) {
649 zlog_warn("No supported protocols TLV in %s", pdu_name);
650 goto out;
651 }
652
653 if (!isis_tlvs_auth_is_valid(iih.tlvs, &circuit->passwd,
654 circuit->rcv_stream, false)) {
655 isis_event_auth_failure(circuit->area->area_tag,
656 "IIH authentication failure",
657 iih.sys_id);
658 goto out;
659 }
660
661 if (!memcmp(iih.sys_id, isis->sysid, ISIS_SYS_ID_LEN)) {
662 zlog_warn(
663 "ISIS-Adj (%s): Received IIH with own sysid - discard",
664 circuit->area->area_tag);
665 goto out;
666 }
667
668 if (!p2p_hello
669 && (listcount(circuit->area->area_addrs) == 0
670 || (level == ISIS_LEVEL1
671 && !isis_tlvs_area_addresses_match(
672 iih.tlvs, circuit->area->area_addrs)))) {
673 if (isis->debugs & DEBUG_ADJ_PACKETS) {
674 zlog_debug(
675 "ISIS-Adj (%s): Area mismatch, level %d IIH on %s",
676 circuit->area->area_tag, level,
677 circuit->interface->name);
678 }
679 goto out;
680 }
681
682 iih.v4_usable = (fabricd_ip_addrs(circuit)
683 && iih.tlvs->ipv4_address.count);
684
685 iih.v6_usable = (circuit->ipv6_link && listcount(circuit->ipv6_link)
686 && iih.tlvs->ipv6_address.count);
687
688 if (!iih.v4_usable && !iih.v6_usable) {
689 if (isis->debugs & DEBUG_ADJ_PACKETS) {
690 zlog_warn(
691 "ISIS-Adj (%s): Neither IPv4 nor IPv6 considered usable. Ignoring IIH",
692 circuit->area->area_tag);
693 }
694
695 goto out;
696 }
697
698 retval = p2p_hello ? process_p2p_hello(&iih) : process_lan_hello(&iih);
699 out:
700 isis_free_tlvs(iih.tlvs);
701
702 return retval;
703 }
704
705 /*
706 * Process Level 1/2 Link State
707 * ISO - 10589
708 * Section 7.3.15.1 - Action on receipt of a link state PDU
709 */
710 static int process_lsp(uint8_t pdu_type, struct isis_circuit *circuit,
711 const uint8_t *ssnpa, uint8_t max_area_addrs)
712 {
713 int level;
714 bool circuit_scoped;
715
716 if (pdu_type == FS_LINK_STATE) {
717 if (!fabricd)
718 return ISIS_ERROR;
719 if (max_area_addrs != L2_CIRCUIT_FLOODING_SCOPE)
720 return ISIS_ERROR;
721 level = ISIS_LEVEL2;
722 circuit_scoped = true;
723
724 /* The stream is used verbatim for sending out new LSPDUs.
725 * So make sure we store it as an L2 LSPDU internally.
726 * (compare for the reverse in `send_lsp`) */
727 stream_putc_at(circuit->rcv_stream, 4, L2_LINK_STATE);
728 stream_putc_at(circuit->rcv_stream, 7, 0);
729 } else {
730 if (pdu_type == L1_LINK_STATE)
731 level = ISIS_LEVEL1;
732 else
733 level = ISIS_LEVEL2;
734 circuit_scoped = false;
735 }
736
737 if (isis->debugs & DEBUG_UPDATE_PACKETS) {
738 zlog_debug(
739 "ISIS-Upd (%s): Rcvd %sL%d LSP on %s, cirType %s, cirID %u",
740 circuit->area->area_tag,
741 circuit_scoped ? "Circuit scoped " : "", level,
742 circuit->interface->name,
743 circuit_t2string(circuit->is_type),
744 circuit->circuit_id);
745 if (isis->debugs & DEBUG_PACKET_DUMP)
746 zlog_dump_data(STREAM_DATA(circuit->rcv_stream),
747 stream_get_endp(circuit->rcv_stream));
748 }
749
750 struct isis_lsp_hdr hdr = {};
751
752 hdr.pdu_len = stream_getw(circuit->rcv_stream);
753 hdr.rem_lifetime = stream_getw(circuit->rcv_stream);
754 stream_get(hdr.lsp_id, circuit->rcv_stream, sizeof(hdr.lsp_id));
755 hdr.seqno = stream_getl(circuit->rcv_stream);
756 hdr.checksum = stream_getw(circuit->rcv_stream);
757 hdr.lsp_bits = stream_getc(circuit->rcv_stream);
758
759 if (pdu_len_validate(hdr.pdu_len, circuit)) {
760 zlog_debug("ISIS-Upd (%s): LSP %s invalid LSP length %" PRIu16,
761 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
762 hdr.pdu_len);
763 return ISIS_WARNING;
764 }
765
766 if (isis->debugs & DEBUG_UPDATE_PACKETS) {
767 zlog_debug("ISIS-Upd (%s): Rcvd L%d LSP %s, seq 0x%08" PRIx32
768 ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
769 "s, len %" PRIu16 ", on %s",
770 circuit->area->area_tag, level,
771 rawlspid_print(hdr.lsp_id), hdr.seqno, hdr.checksum,
772 hdr.rem_lifetime, hdr.pdu_len,
773 circuit->interface->name);
774 }
775
776 /* lsp is_type check */
777 if ((hdr.lsp_bits & IS_LEVEL_1) != IS_LEVEL_1) {
778 zlog_debug(
779 "ISIS-Upd (%s): LSP %s invalid LSP is type 0x%" PRIx8,
780 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
781 hdr.lsp_bits & IS_LEVEL_1_AND_2);
782 /* continue as per RFC1122 Be liberal in what you accept, and
783 * conservative in what you send */
784 }
785
786 /* Checksum sanity check - FIXME: move to correct place */
787 /* 12 = sysid+pdu+remtime */
788 if (iso_csum_verify(STREAM_DATA(circuit->rcv_stream) + 12,
789 hdr.pdu_len - 12, hdr.checksum, 12)) {
790 zlog_debug(
791 "ISIS-Upd (%s): LSP %s invalid LSP checksum 0x%04" PRIx16,
792 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
793 hdr.checksum);
794 return ISIS_WARNING;
795 }
796
797 /* 7.3.15.1 a) 1 - external domain circuit will discard lsps */
798 if (circuit->ext_domain) {
799 zlog_debug(
800 "ISIS-Upd (%s): LSP %s received at level %d over circuit with "
801 "externalDomain = true",
802 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
803 level);
804 return ISIS_WARNING;
805 }
806
807 /* 7.3.15.1 a) 2,3 - manualL2OnlyMode not implemented */
808 if (!(circuit->is_type & level)) {
809 zlog_debug(
810 "ISIS-Upd (%s): LSP %s received at level %d over circuit of"
811 " type %s",
812 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
813 level, circuit_t2string(circuit->is_type));
814 return ISIS_WARNING;
815 }
816
817 struct isis_tlvs *tlvs = NULL;
818 int retval = ISIS_WARNING;
819 const char *error_log;
820
821 if (isis_unpack_tlvs(STREAM_READABLE(circuit->rcv_stream),
822 circuit->rcv_stream, &tlvs, &error_log)) {
823 zlog_warn("Something went wrong unpacking the LSP: %s",
824 error_log);
825 goto out;
826 }
827
828 /* 7.3.15.1 a) 4 - need to make sure IDLength matches */
829
830 /* 7.3.15.1 a) 5 - maximum area match, can be ommited since we only use
831 * 3 */
832
833 /* 7.3.15.1 a) 7 - password check */
834 struct isis_passwd *passwd = (level == ISIS_LEVEL1)
835 ? &circuit->area->area_passwd
836 : &circuit->area->domain_passwd;
837 if (!isis_tlvs_auth_is_valid(tlvs, passwd, circuit->rcv_stream, true)) {
838 isis_event_auth_failure(circuit->area->area_tag,
839 "LSP authentication failure",
840 hdr.lsp_id);
841 goto out;
842 }
843
844 /* Find the LSP in our database and compare it to this Link State header
845 */
846 struct isis_lsp *lsp =
847 lsp_search(hdr.lsp_id, circuit->area->lspdb[level - 1]);
848 int comp = 0;
849 if (lsp)
850 comp = lsp_compare(circuit->area->area_tag, lsp, hdr.seqno,
851 hdr.checksum, hdr.rem_lifetime);
852 if (lsp && (lsp->own_lsp))
853 goto dontcheckadj;
854
855 /* 7.3.15.1 a) 6 - Must check that we have an adjacency of the same
856 * level */
857 /* for broadcast circuits, snpa should be compared */
858
859 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
860 if (!isis_adj_lookup_snpa(ssnpa,
861 circuit->u.bc.adjdb[level - 1])) {
862 zlog_debug("(%s): DS ======= LSP %s, seq 0x%08" PRIx32
863 ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
864 "s on %s",
865 circuit->area->area_tag,
866 rawlspid_print(hdr.lsp_id), hdr.seqno,
867 hdr.checksum, hdr.rem_lifetime,
868 circuit->interface->name);
869 goto out; /* Silently discard */
870 }
871 }
872 /* for non broadcast, we just need to find same level adj */
873 else {
874 /* If no adj, or no sharing of level */
875 if (!circuit->u.p2p.neighbor) {
876 retval = ISIS_OK;
877 goto out;
878 } else {
879 if (((level == IS_LEVEL_1)
880 && (circuit->u.p2p.neighbor->adj_usage
881 == ISIS_ADJ_LEVEL2))
882 || ((level == IS_LEVEL_2)
883 && (circuit->u.p2p.neighbor->adj_usage
884 == ISIS_ADJ_LEVEL1)))
885 goto out;
886 }
887 }
888
889 bool lsp_confusion;
890
891 dontcheckadj:
892 /* 7.3.15.1 a) 7 - Passwords for level 1 - not implemented */
893
894 /* 7.3.15.1 a) 8 - Passwords for level 2 - not implemented */
895
896 /* 7.3.15.1 a) 9 - OriginatingLSPBufferSize - not implemented FIXME: do
897 * it */
898
899 /* 7.3.16.2 - If this is an LSP from another IS with identical seq_num
900 * but
901 * wrong checksum, initiate a purge. */
902 if (lsp && (lsp->hdr.seqno == hdr.seqno)
903 && (lsp->hdr.checksum != hdr.checksum)
904 && hdr.rem_lifetime) {
905 zlog_warn("ISIS-Upd (%s): LSP %s seq 0x%08" PRIx32
906 " with confused checksum received.",
907 circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
908 hdr.seqno);
909 hdr.rem_lifetime = 0;
910 lsp_confusion = true;
911 } else
912 lsp_confusion = false;
913
914 /* 7.3.15.1 b) - If the remaining life time is 0, we perform 7.3.16.4 */
915 if (hdr.rem_lifetime == 0) {
916 if (!lsp) {
917 /* 7.3.16.4 a) 1) No LSP in db -> send an ack, but don't
918 * save */
919 /* only needed on explicit update, eg - p2p */
920 if (circuit->circ_type == CIRCUIT_T_P2P)
921 ack_lsp(&hdr, circuit, level);
922 goto out; /* FIXME: do we need a purge? */
923 } else {
924 if (memcmp(hdr.lsp_id, isis->sysid, ISIS_SYS_ID_LEN)) {
925 /* LSP by some other system -> do 7.3.16.4 b) */
926 /* 7.3.16.4 b) 1) */
927 if (comp == LSP_NEWER) {
928 lsp_update(lsp, &hdr, tlvs,
929 circuit->rcv_stream,
930 circuit->area, level,
931 lsp_confusion);
932 tlvs = NULL;
933 /* ii */
934 if (!circuit_scoped)
935 lsp_flood(lsp, NULL);
936 /* v */
937 ISIS_FLAGS_CLEAR_ALL(
938 lsp->SSNflags); /* FIXME:
939 OTHER
940 than c
941 */
942
943 /* For the case of lsp confusion, flood
944 * the purge back to its
945 * originator so that it can react.
946 * Otherwise, don't reflood
947 * through incoming circuit as usual */
948 if (!lsp_confusion) {
949 isis_tx_queue_del(
950 circuit->tx_queue,
951 lsp);
952
953 /* iv */
954 if (circuit->circ_type
955 != CIRCUIT_T_BROADCAST)
956 ISIS_SET_FLAG(
957 lsp->SSNflags,
958 circuit);
959 }
960 } /* 7.3.16.4 b) 2) */
961 else if (comp == LSP_EQUAL) {
962 /* i */
963 isis_tx_queue_del(circuit->tx_queue,
964 lsp);
965 /* ii */
966 if (circuit->circ_type
967 != CIRCUIT_T_BROADCAST)
968 ISIS_SET_FLAG(lsp->SSNflags,
969 circuit);
970 } /* 7.3.16.4 b) 3) */
971 else {
972 isis_tx_queue_add(circuit->tx_queue,
973 lsp, TX_LSP_NORMAL);
974 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
975 }
976 } else if (lsp->hdr.rem_lifetime != 0) {
977 /* our own LSP -> 7.3.16.4 c) */
978 if (comp == LSP_NEWER) {
979 lsp_inc_seqno(lsp, hdr.seqno);
980 if (!circuit_scoped)
981 lsp_flood(lsp, NULL);
982 } else {
983 isis_tx_queue_add(circuit->tx_queue,
984 lsp, TX_LSP_NORMAL);
985 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
986 }
987 if (isis->debugs & DEBUG_UPDATE_PACKETS)
988 zlog_debug(
989 "ISIS-Upd (%s): (1) re-originating LSP %s new seq 0x%08" PRIx32,
990 circuit->area->area_tag,
991 rawlspid_print(hdr.lsp_id),
992 lsp->hdr.seqno);
993 }
994 }
995 goto out;
996 }
997 /* 7.3.15.1 c) - If this is our own lsp and we don't have it initiate a
998 * purge */
999 if (memcmp(hdr.lsp_id, isis->sysid, ISIS_SYS_ID_LEN) == 0) {
1000 if (!lsp) {
1001 /* 7.3.16.4: initiate a purge */
1002 lsp_purge_non_exist(level, &hdr, circuit->area);
1003 retval = ISIS_OK;
1004 goto out;
1005 }
1006 /* 7.3.15.1 d) - If this is our own lsp and we have it */
1007
1008 /* In 7.3.16.1, If an Intermediate system R somewhere in the
1009 * domain
1010 * has information that the current sequence number for source S
1011 * is
1012 * "greater" than that held by S, ... */
1013
1014 if (hdr.seqno > lsp->hdr.seqno) {
1015 /* 7.3.16.1 */
1016 lsp_inc_seqno(lsp, hdr.seqno);
1017 if (isis->debugs & DEBUG_UPDATE_PACKETS)
1018 zlog_debug(
1019 "ISIS-Upd (%s): (2) re-originating LSP %s new seq 0x%08" PRIx32,
1020 circuit->area->area_tag,
1021 rawlspid_print(hdr.lsp_id),
1022 lsp->hdr.seqno);
1023 }
1024 /* If the received LSP is older or equal,
1025 * resend the LSP which will act as ACK */
1026 lsp_flood(lsp, NULL);
1027 } else {
1028 /* 7.3.15.1 e) - This lsp originated on another system */
1029
1030 /* 7.3.15.1 e) 1) LSP newer than the one in db or no LSP in db
1031 */
1032 if ((!lsp || comp == LSP_NEWER)) {
1033 /*
1034 * If this lsp is a frag, need to see if we have zero
1035 * lsp present
1036 */
1037 struct isis_lsp *lsp0 = NULL;
1038 if (LSP_FRAGMENT(hdr.lsp_id) != 0) {
1039 uint8_t lspid[ISIS_SYS_ID_LEN + 2];
1040 memcpy(lspid, hdr.lsp_id, ISIS_SYS_ID_LEN + 1);
1041 LSP_FRAGMENT(lspid) = 0;
1042 lsp0 = lsp_search(
1043 lspid, circuit->area->lspdb[level - 1]);
1044 if (!lsp0) {
1045 zlog_debug(
1046 "Got lsp frag, while zero lsp not in database");
1047 goto out;
1048 }
1049 }
1050 /* i */
1051 if (!lsp) {
1052 lsp = lsp_new_from_recv(
1053 &hdr, tlvs, circuit->rcv_stream, lsp0,
1054 circuit->area, level);
1055 tlvs = NULL;
1056 lsp_insert(lsp,
1057 circuit->area->lspdb[level - 1]);
1058 } else /* exists, so we overwrite */
1059 {
1060 lsp_update(lsp, &hdr, tlvs, circuit->rcv_stream,
1061 circuit->area, level, false);
1062 tlvs = NULL;
1063 }
1064 if (!circuit_scoped)
1065 lsp_flood(lsp, circuit);
1066
1067 /* iv */
1068 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1069 ISIS_SET_FLAG(lsp->SSNflags, circuit);
1070 /* FIXME: v) */
1071 }
1072 /* 7.3.15.1 e) 2) LSP equal to the one in db */
1073 else if (comp == LSP_EQUAL) {
1074 isis_tx_queue_del(circuit->tx_queue, lsp);
1075 lsp_update(lsp, &hdr, tlvs, circuit->rcv_stream,
1076 circuit->area, level, false);
1077 tlvs = NULL;
1078 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1079 ISIS_SET_FLAG(lsp->SSNflags, circuit);
1080 }
1081 /* 7.3.15.1 e) 3) LSP older than the one in db */
1082 else {
1083 isis_tx_queue_add(circuit->tx_queue, lsp,
1084 TX_LSP_NORMAL);
1085 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
1086 }
1087 }
1088
1089 retval = ISIS_OK;
1090
1091 out:
1092 if (circuit_scoped) {
1093 fabricd_trigger_csnp(circuit->area);
1094 }
1095
1096 isis_free_tlvs(tlvs);
1097 return retval;
1098 }
1099
1100 /*
1101 * Process Sequence Numbers
1102 * ISO - 10589
1103 * Section 7.3.15.2 - Action on receipt of a sequence numbers PDU
1104 */
1105
1106 static int process_snp(uint8_t pdu_type, struct isis_circuit *circuit,
1107 const uint8_t *ssnpa)
1108 {
1109 bool is_csnp = (pdu_type == L1_COMPLETE_SEQ_NUM
1110 || pdu_type == L2_COMPLETE_SEQ_NUM);
1111 char typechar = is_csnp ? 'C' : 'P';
1112 int level = (pdu_type == L1_COMPLETE_SEQ_NUM
1113 || pdu_type == L1_PARTIAL_SEQ_NUM)
1114 ? ISIS_LEVEL1
1115 : ISIS_LEVEL2;
1116
1117 uint16_t pdu_len = stream_getw(circuit->rcv_stream);
1118 uint8_t rem_sys_id[ISIS_SYS_ID_LEN];
1119 stream_get(rem_sys_id, circuit->rcv_stream, ISIS_SYS_ID_LEN);
1120 stream_forward_getp(circuit->rcv_stream, 1); /* Circuit ID - unused */
1121
1122 uint8_t start_lsp_id[ISIS_SYS_ID_LEN + 2] = {};
1123 uint8_t stop_lsp_id[ISIS_SYS_ID_LEN + 2] = {};
1124
1125 if (is_csnp) {
1126 stream_get(start_lsp_id, circuit->rcv_stream,
1127 ISIS_SYS_ID_LEN + 2);
1128 stream_get(stop_lsp_id, circuit->rcv_stream,
1129 ISIS_SYS_ID_LEN + 2);
1130 }
1131
1132 if (pdu_len_validate(pdu_len, circuit)) {
1133 zlog_warn("Received a CSNP with bogus length %d", pdu_len);
1134 return ISIS_WARNING;
1135 }
1136
1137 if (isis->debugs & DEBUG_SNP_PACKETS) {
1138 zlog_debug(
1139 "ISIS-Snp (%s): Rcvd L%d %cSNP on %s, cirType %s, cirID %u",
1140 circuit->area->area_tag, level, typechar,
1141 circuit->interface->name,
1142 circuit_t2string(circuit->is_type),
1143 circuit->circuit_id);
1144 if (isis->debugs & DEBUG_PACKET_DUMP)
1145 zlog_dump_data(STREAM_DATA(circuit->rcv_stream),
1146 stream_get_endp(circuit->rcv_stream));
1147 }
1148
1149 /* 7.3.15.2 a) 1 - external domain circuit will discard snp pdu */
1150 if (circuit->ext_domain) {
1151
1152 zlog_debug(
1153 "ISIS-Snp (%s): Rcvd L%d %cSNP on %s, "
1154 "skipping: circuit externalDomain = true",
1155 circuit->area->area_tag, level, typechar,
1156 circuit->interface->name);
1157
1158 return ISIS_OK;
1159 }
1160
1161 /* 7.3.15.2 a) 2,3 - manualL2OnlyMode not implemented */
1162 if (!(circuit->is_type & level)) {
1163 zlog_debug(
1164 "ISIS-Snp (%s): Rcvd L%d %cSNP on %s, "
1165 "skipping: circuit type %s does not match level %d",
1166 circuit->area->area_tag, level, typechar,
1167 circuit->interface->name,
1168 circuit_t2string(circuit->is_type), level);
1169
1170 return ISIS_OK;
1171 }
1172
1173 /* 7.3.15.2 a) 4 - not applicable for CSNP only PSNPs on broadcast */
1174 if (!is_csnp && (circuit->circ_type == CIRCUIT_T_BROADCAST)
1175 && !circuit->u.bc.is_dr[level - 1]) {
1176 zlog_debug(
1177 "ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s, "
1178 "skipping: we are not the DIS",
1179 circuit->area->area_tag, level, typechar,
1180 snpa_print(ssnpa), circuit->interface->name);
1181
1182 return ISIS_OK;
1183 }
1184
1185 /* 7.3.15.2 a) 5 - need to make sure IDLength matches - already checked
1186 */
1187
1188 /* 7.3.15.2 a) 6 - maximum area match, can be ommited since we only use
1189 * 3
1190 * - already checked */
1191
1192 /* 7.3.15.2 a) 7 - Must check that we have an adjacency of the same
1193 * level */
1194 /* for broadcast circuits, snpa should be compared */
1195 /* FIXME : Do we need to check SNPA? */
1196 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1197 if (!isis_adj_lookup(rem_sys_id,
1198 circuit->u.bc.adjdb[level - 1]))
1199 return ISIS_OK; /* Silently discard */
1200 } else {
1201 if (!fabricd && !circuit->u.p2p.neighbor) {
1202 zlog_warn("no p2p neighbor on circuit %s",
1203 circuit->interface->name);
1204 return ISIS_OK; /* Silently discard */
1205 }
1206 }
1207
1208 struct isis_tlvs *tlvs;
1209 int retval = ISIS_WARNING;
1210 const char *error_log;
1211
1212 if (isis_unpack_tlvs(STREAM_READABLE(circuit->rcv_stream),
1213 circuit->rcv_stream, &tlvs, &error_log)) {
1214 zlog_warn("Something went wrong unpacking the SNP: %s",
1215 error_log);
1216 goto out;
1217 }
1218
1219 struct isis_passwd *passwd = (level == IS_LEVEL_1)
1220 ? &circuit->area->area_passwd
1221 : &circuit->area->domain_passwd;
1222 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_RECV)
1223 && !isis_tlvs_auth_is_valid(tlvs, passwd, circuit->rcv_stream,
1224 false)) {
1225 isis_event_auth_failure(circuit->area->area_tag,
1226 "SNP authentication failure",
1227 rem_sys_id);
1228 goto out;
1229 }
1230
1231 struct isis_lsp_entry *entry_head =
1232 (struct isis_lsp_entry *)tlvs->lsp_entries.head;
1233
1234 /* debug isis snp-packets */
1235 if (isis->debugs & DEBUG_SNP_PACKETS) {
1236 zlog_debug("ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s",
1237 circuit->area->area_tag, level, typechar,
1238 snpa_print(ssnpa), circuit->interface->name);
1239 for (struct isis_lsp_entry *entry = entry_head; entry;
1240 entry = entry->next) {
1241 zlog_debug(
1242 "ISIS-Snp (%s): %cSNP entry %s, seq 0x%08" PRIx32
1243 ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16 "s",
1244 circuit->area->area_tag, typechar,
1245 rawlspid_print(entry->id), entry->seqno,
1246 entry->checksum, entry->rem_lifetime);
1247 }
1248 }
1249
1250 bool resync_needed = false;
1251
1252 /* 7.3.15.2 b) Actions on LSP_ENTRIES reported */
1253 for (struct isis_lsp_entry *entry = entry_head; entry;
1254 entry = entry->next) {
1255 struct isis_lsp *lsp =
1256 lsp_search(entry->id, circuit->area->lspdb[level - 1]);
1257 bool own_lsp = !memcmp(entry->id, isis->sysid, ISIS_SYS_ID_LEN);
1258 if (lsp) {
1259 /* 7.3.15.2 b) 1) is this LSP newer */
1260 int cmp = lsp_compare(circuit->area->area_tag, lsp,
1261 entry->seqno, entry->checksum,
1262 entry->rem_lifetime);
1263 /* 7.3.15.2 b) 2) if it equals, clear SRM on p2p */
1264 if (cmp == LSP_EQUAL) {
1265 /* if (circuit->circ_type !=
1266 * CIRCUIT_T_BROADCAST) */
1267 isis_tx_queue_del(circuit->tx_queue, lsp);
1268 }
1269 /* 7.3.15.2 b) 3) if it is older, clear SSN and set SRM
1270 */
1271 else if (cmp == LSP_OLDER) {
1272 ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
1273 isis_tx_queue_add(circuit->tx_queue, lsp,
1274 TX_LSP_NORMAL);
1275 }
1276 /* 7.3.15.2 b) 4) if it is newer, set SSN and clear SRM
1277 on p2p */
1278 else {
1279 if (own_lsp) {
1280 lsp_inc_seqno(lsp, entry->seqno);
1281 isis_tx_queue_add(circuit->tx_queue, lsp,
1282 TX_LSP_NORMAL);
1283 } else {
1284 ISIS_SET_FLAG(lsp->SSNflags, circuit);
1285 /* if (circuit->circ_type !=
1286 * CIRCUIT_T_BROADCAST) */
1287 isis_tx_queue_del(circuit->tx_queue, lsp);
1288 resync_needed = true;
1289 }
1290 }
1291 } else {
1292 /* 7.3.15.2 b) 5) if it was not found, and all of those
1293 * are not 0,
1294 * insert it and set SSN on it */
1295 if (entry->rem_lifetime && entry->checksum
1296 && entry->seqno && memcmp(entry->id, isis->sysid,
1297 ISIS_SYS_ID_LEN)) {
1298 struct isis_lsp *lsp0 = NULL;
1299
1300 if (LSP_FRAGMENT(entry->id)) {
1301 uint8_t lspid[ISIS_SYS_ID_LEN + 2];
1302
1303 memcpy(lspid, entry->id,
1304 ISIS_SYS_ID_LEN + 1);
1305 LSP_FRAGMENT(lspid) = 0;
1306 lsp0 = lsp_search(
1307 lspid,
1308 circuit->area->lspdb[level - 1]);
1309 if (!lsp0) {
1310 zlog_debug("Got lsp frag in snp, while zero not in database");
1311 continue;
1312 }
1313 }
1314 lsp = lsp_new(circuit->area, entry->id,
1315 entry->rem_lifetime, 0, 0,
1316 entry->checksum, lsp0, level);
1317 lsp_insert(lsp,
1318 circuit->area->lspdb[level - 1]);
1319
1320 lsp_set_all_srmflags(lsp, false);
1321 ISIS_SET_FLAG(lsp->SSNflags, circuit);
1322 resync_needed = true;
1323 }
1324 }
1325 }
1326
1327 /* 7.3.15.2 c) on CSNP set SRM for all in range which were not reported
1328 */
1329 if (is_csnp) {
1330 /*
1331 * Build a list from our own LSP db bounded with
1332 * start_lsp_id and stop_lsp_id
1333 */
1334 struct list *lsp_list = list_new();
1335 lsp_build_list_nonzero_ht(start_lsp_id, stop_lsp_id, lsp_list,
1336 circuit->area->lspdb[level - 1]);
1337
1338 /* Fixme: Find a better solution */
1339 struct listnode *node, *nnode;
1340 struct isis_lsp *lsp;
1341 for (struct isis_lsp_entry *entry = entry_head; entry;
1342 entry = entry->next) {
1343 for (ALL_LIST_ELEMENTS(lsp_list, node, nnode, lsp)) {
1344 if (lsp_id_cmp(lsp->hdr.lsp_id, entry->id)
1345 == 0) {
1346 list_delete_node(lsp_list, node);
1347 break;
1348 }
1349 }
1350 }
1351
1352 /* on remaining LSPs we set SRM (neighbor knew not of) */
1353 for (ALL_LIST_ELEMENTS_RO(lsp_list, node, lsp)) {
1354 isis_tx_queue_add(circuit->tx_queue, lsp, TX_LSP_NORMAL);
1355 resync_needed = true;
1356 }
1357
1358 /* lets free it */
1359 list_delete_and_null(&lsp_list);
1360 }
1361
1362 if (fabricd_initial_sync_is_complete(circuit->area) && resync_needed)
1363 zlog_warn("OpenFabric: Needed to resync LSPDB using CSNP!\n");
1364
1365 retval = ISIS_OK;
1366 out:
1367 isis_free_tlvs(tlvs);
1368 return retval;
1369 }
1370
1371 static int pdu_size(uint8_t pdu_type, uint8_t *size)
1372 {
1373 switch (pdu_type) {
1374 case L1_LAN_HELLO:
1375 case L2_LAN_HELLO:
1376 *size = ISIS_LANHELLO_HDRLEN;
1377 break;
1378 case P2P_HELLO:
1379 *size = ISIS_P2PHELLO_HDRLEN;
1380 break;
1381 case L1_LINK_STATE:
1382 case L2_LINK_STATE:
1383 case FS_LINK_STATE:
1384 *size = ISIS_LSP_HDR_LEN;
1385 break;
1386 case L1_COMPLETE_SEQ_NUM:
1387 case L2_COMPLETE_SEQ_NUM:
1388 *size = ISIS_CSNP_HDRLEN;
1389 break;
1390 case L1_PARTIAL_SEQ_NUM:
1391 case L2_PARTIAL_SEQ_NUM:
1392 *size = ISIS_PSNP_HDRLEN;
1393 break;
1394 default:
1395 return 1;
1396 }
1397 *size += ISIS_FIXED_HDR_LEN;
1398 return 0;
1399 }
1400
1401 /*
1402 * PDU Dispatcher
1403 */
1404
1405 int isis_handle_pdu(struct isis_circuit *circuit, uint8_t *ssnpa)
1406 {
1407 int retval = ISIS_OK;
1408
1409 /* Verify that at least the 8 bytes fixed header have been received */
1410 if (stream_get_endp(circuit->rcv_stream) < ISIS_FIXED_HDR_LEN) {
1411 flog_err(EC_ISIS_PACKET, "PDU is too short to be IS-IS.");
1412 return ISIS_ERROR;
1413 }
1414
1415 uint8_t idrp = stream_getc(circuit->rcv_stream);
1416 uint8_t length = stream_getc(circuit->rcv_stream);
1417 uint8_t version1 = stream_getc(circuit->rcv_stream);
1418 uint8_t id_len = stream_getc(circuit->rcv_stream);
1419 uint8_t pdu_type = stream_getc(circuit->rcv_stream)
1420 & 0x1f; /* bits 6-8 are reserved */
1421 uint8_t version2 = stream_getc(circuit->rcv_stream);
1422 stream_forward_getp(circuit->rcv_stream, 1); /* reserved */
1423 uint8_t max_area_addrs = stream_getc(circuit->rcv_stream);
1424
1425 if (idrp == ISO9542_ESIS) {
1426 flog_err(EC_LIB_DEVELOPMENT,
1427 "No support for ES-IS packet IDRP=%" PRIx8, idrp);
1428 return ISIS_ERROR;
1429 }
1430
1431 if (idrp != ISO10589_ISIS) {
1432 flog_err(EC_ISIS_PACKET, "Not an IS-IS packet IDRP=%" PRIx8,
1433 idrp);
1434 return ISIS_ERROR;
1435 }
1436
1437 if (version1 != 1) {
1438 zlog_warn("Unsupported ISIS version %" PRIu8, version1);
1439 return ISIS_WARNING;
1440 }
1441
1442 if (id_len != 0 && id_len != ISIS_SYS_ID_LEN) {
1443 flog_err(
1444 EC_ISIS_PACKET,
1445 "IDFieldLengthMismatch: ID Length field in a received PDU %" PRIu8
1446 ", while the parameter for this IS is %u",
1447 id_len, ISIS_SYS_ID_LEN);
1448 return ISIS_ERROR;
1449 }
1450
1451 uint8_t expected_length;
1452 if (pdu_size(pdu_type, &expected_length)) {
1453 zlog_warn("Unsupported ISIS PDU %" PRIu8, pdu_type);
1454 return ISIS_WARNING;
1455 }
1456
1457 if (length != expected_length) {
1458 flog_err(EC_ISIS_PACKET,
1459 "Exepected fixed header length = %" PRIu8
1460 " but got %" PRIu8,
1461 expected_length, length);
1462 return ISIS_ERROR;
1463 }
1464
1465 if (stream_get_endp(circuit->rcv_stream) < length) {
1466 flog_err(
1467 EC_ISIS_PACKET,
1468 "PDU is too short to contain fixed header of given PDU type.");
1469 return ISIS_ERROR;
1470 }
1471
1472 if (version2 != 1) {
1473 zlog_warn("Unsupported ISIS PDU version %" PRIu8, version2);
1474 return ISIS_WARNING;
1475 }
1476
1477 if (circuit->is_passive) {
1478 zlog_warn("Received ISIS PDU on passive circuit %s",
1479 circuit->interface->name);
1480 return ISIS_WARNING;
1481 }
1482
1483 /* either 3 or 0 */
1484 if (pdu_type != FS_LINK_STATE /* FS PDU doesn't contain max area addr field */
1485 && max_area_addrs != 0
1486 && max_area_addrs != isis->max_area_addrs) {
1487 flog_err(
1488 EC_ISIS_PACKET,
1489 "maximumAreaAddressesMismatch: maximumAreaAdresses in a received PDU %" PRIu8
1490 " while the parameter for this IS is %u",
1491 max_area_addrs, isis->max_area_addrs);
1492 return ISIS_ERROR;
1493 }
1494
1495 switch (pdu_type) {
1496 case L1_LAN_HELLO:
1497 case L2_LAN_HELLO:
1498 case P2P_HELLO:
1499 if (fabricd && pdu_type != P2P_HELLO)
1500 return ISIS_ERROR;
1501 retval = process_hello(pdu_type, circuit, ssnpa);
1502 break;
1503 case L1_LINK_STATE:
1504 case L2_LINK_STATE:
1505 case FS_LINK_STATE:
1506 if (fabricd
1507 && pdu_type != L2_LINK_STATE
1508 && pdu_type != FS_LINK_STATE)
1509 return ISIS_ERROR;
1510 retval = process_lsp(pdu_type, circuit, ssnpa, max_area_addrs);
1511 break;
1512 case L1_COMPLETE_SEQ_NUM:
1513 case L2_COMPLETE_SEQ_NUM:
1514 case L1_PARTIAL_SEQ_NUM:
1515 case L2_PARTIAL_SEQ_NUM:
1516 retval = process_snp(pdu_type, circuit, ssnpa);
1517 break;
1518 default:
1519 return ISIS_ERROR;
1520 }
1521
1522 return retval;
1523 }
1524
1525 int isis_receive(struct thread *thread)
1526 {
1527 struct isis_circuit *circuit;
1528 uint8_t ssnpa[ETH_ALEN];
1529 int retval;
1530
1531 /*
1532 * Get the circuit
1533 */
1534 circuit = THREAD_ARG(thread);
1535 assert(circuit);
1536
1537 circuit->t_read = NULL;
1538
1539 isis_circuit_stream(circuit, &circuit->rcv_stream);
1540
1541 retval = circuit->rx(circuit, ssnpa);
1542
1543 #if ISIS_METHOD != ISIS_METHOD_BPF
1544 if (retval == ISIS_OK)
1545 retval = isis_handle_pdu(circuit, ssnpa);
1546 #endif //ISIS_METHOD != ISIS_METHOD_BPF
1547
1548 /*
1549 * prepare for next packet.
1550 */
1551 if (!circuit->is_passive)
1552 isis_circuit_prepare(circuit);
1553
1554 return retval;
1555 }
1556
1557 /*
1558 * SEND SIDE
1559 */
1560 void fill_fixed_hdr(uint8_t pdu_type, struct stream *stream)
1561 {
1562 uint8_t length;
1563
1564 if (pdu_size(pdu_type, &length))
1565 assert(!"Unknown PDU Type");
1566
1567 stream_putc(stream, ISO10589_ISIS); /* IDRP */
1568 stream_putc(stream, length); /* Length of fixed header */
1569 stream_putc(stream, 1); /* Version/Protocol ID Extension 1 */
1570 stream_putc(stream, 0); /* ID Length, 0 => 6 */
1571 stream_putc(stream, pdu_type);
1572 stream_putc(stream, 1); /* Subversion */
1573 stream_putc(stream, 0); /* Reserved */
1574 stream_putc(stream, 0); /* Max Area Addresses 0 => 3 */
1575 }
1576
1577 static void put_hello_hdr(struct isis_circuit *circuit, int level,
1578 size_t *len_pointer)
1579 {
1580 uint8_t pdu_type;
1581
1582 if (circuit->circ_type == CIRCUIT_T_BROADCAST)
1583 pdu_type = (level == IS_LEVEL_1) ? L1_LAN_HELLO : L2_LAN_HELLO;
1584 else
1585 pdu_type = P2P_HELLO;
1586
1587 isis_circuit_stream(circuit, &circuit->snd_stream);
1588 fill_fixed_hdr(pdu_type, circuit->snd_stream);
1589
1590 stream_putc(circuit->snd_stream, circuit->is_type);
1591 stream_put(circuit->snd_stream, circuit->area->isis->sysid,
1592 ISIS_SYS_ID_LEN);
1593
1594 uint32_t holdtime = circuit->hello_multiplier[level - 1]
1595 * circuit->hello_interval[level - 1];
1596
1597 if (holdtime > 0xffff)
1598 holdtime = 0xffff;
1599
1600 stream_putw(circuit->snd_stream, holdtime);
1601 *len_pointer = stream_get_endp(circuit->snd_stream);
1602 stream_putw(circuit->snd_stream, 0); /* length is filled in later */
1603
1604 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1605 uint8_t *desig_is = (level == IS_LEVEL_1)
1606 ? circuit->u.bc.l1_desig_is
1607 : circuit->u.bc.l2_desig_is;
1608 stream_putc(circuit->snd_stream, circuit->priority[level - 1]);
1609 stream_put(circuit->snd_stream, desig_is, ISIS_SYS_ID_LEN + 1);
1610 } else {
1611 stream_putc(circuit->snd_stream, circuit->circuit_id);
1612 }
1613 }
1614
1615 int send_hello(struct isis_circuit *circuit, int level)
1616 {
1617 size_t len_pointer;
1618 int retval;
1619
1620 if (circuit->is_passive)
1621 return ISIS_OK;
1622
1623 if (circuit->interface->mtu == 0) {
1624 zlog_warn("circuit has zero MTU");
1625 return ISIS_WARNING;
1626 }
1627
1628 put_hello_hdr(circuit, level, &len_pointer);
1629
1630 struct isis_tlvs *tlvs = isis_alloc_tlvs();
1631
1632 isis_tlvs_add_auth(tlvs, &circuit->passwd);
1633
1634 if (!listcount(circuit->area->area_addrs)) {
1635 isis_free_tlvs(tlvs);
1636 return ISIS_WARNING;
1637 }
1638
1639 isis_tlvs_add_area_addresses(tlvs, circuit->area->area_addrs);
1640
1641 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1642 isis_tlvs_add_lan_neighbors(
1643 tlvs, circuit->u.bc.lan_neighs[level - 1]);
1644 } else if (circuit->circ_type == CIRCUIT_T_P2P
1645 && !circuit->disable_threeway_adj) {
1646 uint32_t ext_circuit_id = circuit->idx;
1647 if (circuit->u.p2p.neighbor) {
1648 uint8_t threeway_state;
1649
1650 if (fabricd_initial_sync_is_in_progress(circuit->area)
1651 && fabricd_initial_sync_circuit(circuit->area) != circuit)
1652 threeway_state = ISIS_THREEWAY_DOWN;
1653 else
1654 threeway_state = circuit->u.p2p.neighbor->threeway_state;
1655 isis_tlvs_add_threeway_adj(tlvs,
1656 threeway_state,
1657 ext_circuit_id,
1658 circuit->u.p2p.neighbor->sysid,
1659 circuit->u.p2p.neighbor->ext_circuit_id);
1660 } else {
1661 isis_tlvs_add_threeway_adj(tlvs,
1662 ISIS_THREEWAY_DOWN,
1663 ext_circuit_id,
1664 NULL, 0);
1665 }
1666 }
1667
1668 isis_tlvs_set_protocols_supported(tlvs, &circuit->nlpids);
1669
1670 /*
1671 * MT Supported TLV
1672 *
1673 * TLV gets included if no topology is enabled on the interface,
1674 * if one topology other than #0 is enabled, or if multiple topologies
1675 * are enabled.
1676 */
1677 struct isis_circuit_mt_setting **mt_settings;
1678 unsigned int mt_count;
1679
1680 mt_settings = circuit_mt_settings(circuit, &mt_count);
1681 if (mt_count == 0 && area_is_mt(circuit->area)) {
1682 tlvs->mt_router_info_empty = true;
1683 } else if ((mt_count == 1
1684 && mt_settings[0]->mtid != ISIS_MT_IPV4_UNICAST)
1685 || (mt_count > 1)) {
1686 for (unsigned int i = 0; i < mt_count; i++)
1687 isis_tlvs_add_mt_router_info(tlvs, mt_settings[i]->mtid,
1688 false, false);
1689 }
1690
1691 if (circuit->ip_router) {
1692 struct list *circuit_ip_addrs = fabricd_ip_addrs(circuit);
1693
1694 if (circuit_ip_addrs)
1695 isis_tlvs_add_ipv4_addresses(tlvs, circuit_ip_addrs);
1696 }
1697
1698 if (circuit->ipv6_router && circuit->ipv6_link)
1699 isis_tlvs_add_ipv6_addresses(tlvs, circuit->ipv6_link);
1700
1701 if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
1702 circuit->pad_hellos, false)) {
1703 isis_free_tlvs(tlvs);
1704 return ISIS_WARNING; /* XXX: Maybe Log TLV structure? */
1705 }
1706
1707 if (isis->debugs & DEBUG_ADJ_PACKETS) {
1708 if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
1709 zlog_debug(
1710 "ISIS-Adj (%s): Sending L%d LAN IIH on %s, length %zd",
1711 circuit->area->area_tag, level,
1712 circuit->interface->name,
1713 stream_get_endp(circuit->snd_stream));
1714 } else {
1715 zlog_debug(
1716 "ISIS-Adj (%s): Sending P2P IIH on %s, length %zd",
1717 circuit->area->area_tag,
1718 circuit->interface->name,
1719 stream_get_endp(circuit->snd_stream));
1720 }
1721 if (isis->debugs & DEBUG_PACKET_DUMP)
1722 zlog_dump_data(STREAM_DATA(circuit->snd_stream),
1723 stream_get_endp(circuit->snd_stream));
1724 }
1725
1726 isis_free_tlvs(tlvs);
1727
1728 retval = circuit->tx(circuit, level);
1729 if (retval != ISIS_OK)
1730 flog_err(EC_ISIS_PACKET,
1731 "ISIS-Adj (%s): Send L%d IIH on %s failed",
1732 circuit->area->area_tag, level,
1733 circuit->interface->name);
1734
1735 return retval;
1736 }
1737
1738 int send_lan_l1_hello(struct thread *thread)
1739 {
1740 struct isis_circuit *circuit;
1741 int retval;
1742
1743 circuit = THREAD_ARG(thread);
1744 assert(circuit);
1745 circuit->u.bc.t_send_lan_hello[0] = NULL;
1746
1747 if (!(circuit->area->is_type & IS_LEVEL_1)) {
1748 zlog_warn(
1749 "ISIS-Hello (%s): Trying to send L1 IIH in L2-only area",
1750 circuit->area->area_tag);
1751 return 1;
1752 }
1753
1754 if (circuit->u.bc.run_dr_elect[0])
1755 isis_dr_elect(circuit, 1);
1756
1757 retval = send_hello(circuit, 1);
1758
1759 /* set next timer thread */
1760 thread_add_timer(master, send_lan_l1_hello, circuit,
1761 isis_jitter(circuit->hello_interval[0], IIH_JITTER),
1762 &circuit->u.bc.t_send_lan_hello[0]);
1763
1764 return retval;
1765 }
1766
1767 int send_lan_l2_hello(struct thread *thread)
1768 {
1769 struct isis_circuit *circuit;
1770 int retval;
1771
1772 circuit = THREAD_ARG(thread);
1773 assert(circuit);
1774 circuit->u.bc.t_send_lan_hello[1] = NULL;
1775
1776 if (!(circuit->area->is_type & IS_LEVEL_2)) {
1777 zlog_warn("ISIS-Hello (%s): Trying to send L2 IIH in L1 area",
1778 circuit->area->area_tag);
1779 return 1;
1780 }
1781
1782 if (circuit->u.bc.run_dr_elect[1])
1783 isis_dr_elect(circuit, 2);
1784
1785 retval = send_hello(circuit, 2);
1786
1787 /* set next timer thread */
1788 thread_add_timer(master, send_lan_l2_hello, circuit,
1789 isis_jitter(circuit->hello_interval[1], IIH_JITTER),
1790 &circuit->u.bc.t_send_lan_hello[1]);
1791
1792 return retval;
1793 }
1794
1795 int send_p2p_hello(struct thread *thread)
1796 {
1797 struct isis_circuit *circuit;
1798
1799 circuit = THREAD_ARG(thread);
1800 assert(circuit);
1801 circuit->u.p2p.t_send_p2p_hello = NULL;
1802
1803 send_hello(circuit, 1);
1804
1805 /* set next timer thread */
1806 thread_add_timer(master, send_p2p_hello, circuit,
1807 isis_jitter(circuit->hello_interval[1], IIH_JITTER),
1808 &circuit->u.p2p.t_send_p2p_hello);
1809
1810 return ISIS_OK;
1811 }
1812
1813 /*
1814 * Count the maximum number of lsps that can be accomodated by a given size.
1815 */
1816 #define LSP_ENTRIES_LEN (10 + ISIS_SYS_ID_LEN)
1817 static uint16_t get_max_lsp_count(uint16_t size)
1818 {
1819 uint16_t tlv_count;
1820 uint16_t lsp_count;
1821 uint16_t remaining_size;
1822
1823 /* First count the full size TLVs */
1824 tlv_count = size / MAX_LSP_ENTRIES_TLV_SIZE;
1825 lsp_count = tlv_count * (MAX_LSP_ENTRIES_TLV_SIZE / LSP_ENTRIES_LEN);
1826
1827 /* The last TLV, if any */
1828 remaining_size = size % MAX_LSP_ENTRIES_TLV_SIZE;
1829 if (remaining_size - 2 >= LSP_ENTRIES_LEN)
1830 lsp_count += (remaining_size - 2) / LSP_ENTRIES_LEN;
1831
1832 return lsp_count;
1833 }
1834
1835 int send_csnp(struct isis_circuit *circuit, int level)
1836 {
1837 if (circuit->area->lspdb[level - 1] == NULL
1838 || dict_count(circuit->area->lspdb[level - 1]) == 0)
1839 return ISIS_OK;
1840
1841 isis_circuit_stream(circuit, &circuit->snd_stream);
1842 fill_fixed_hdr((level == ISIS_LEVEL1) ? L1_COMPLETE_SEQ_NUM
1843 : L2_COMPLETE_SEQ_NUM,
1844 circuit->snd_stream);
1845
1846 size_t len_pointer = stream_get_endp(circuit->snd_stream);
1847 stream_putw(circuit->snd_stream, 0);
1848 stream_put(circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
1849 /* with zero circuit id - ref 9.10, 9.11 */
1850 stream_putc(circuit->snd_stream, 0);
1851
1852 size_t start_pointer = stream_get_endp(circuit->snd_stream);
1853 stream_put(circuit->snd_stream, 0, ISIS_SYS_ID_LEN + 2);
1854 size_t end_pointer = stream_get_endp(circuit->snd_stream);
1855 stream_put(circuit->snd_stream, 0, ISIS_SYS_ID_LEN + 2);
1856
1857 struct isis_passwd *passwd = (level == ISIS_LEVEL1)
1858 ? &circuit->area->area_passwd
1859 : &circuit->area->domain_passwd;
1860
1861 struct isis_tlvs *tlvs = isis_alloc_tlvs();
1862
1863 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
1864 isis_tlvs_add_auth(tlvs, passwd);
1865
1866 size_t tlv_start = stream_get_endp(circuit->snd_stream);
1867 if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer, false,
1868 false)) {
1869 isis_free_tlvs(tlvs);
1870 return ISIS_WARNING;
1871 }
1872 isis_free_tlvs(tlvs);
1873
1874 uint16_t num_lsps =
1875 get_max_lsp_count(STREAM_WRITEABLE(circuit->snd_stream));
1876
1877 uint8_t start[ISIS_SYS_ID_LEN + 2];
1878 memset(start, 0x00, ISIS_SYS_ID_LEN + 2);
1879 uint8_t stop[ISIS_SYS_ID_LEN + 2];
1880 memset(stop, 0xff, ISIS_SYS_ID_LEN + 2);
1881
1882 bool loop = true;
1883 while (loop) {
1884 tlvs = isis_alloc_tlvs();
1885 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
1886 isis_tlvs_add_auth(tlvs, passwd);
1887
1888 struct isis_lsp *last_lsp;
1889 isis_tlvs_add_csnp_entries(tlvs, start, stop, num_lsps,
1890 circuit->area->lspdb[level - 1],
1891 &last_lsp);
1892 /*
1893 * Update the stop lsp_id before encoding this CSNP.
1894 */
1895 if (tlvs->lsp_entries.count < num_lsps) {
1896 memset(stop, 0xff, ISIS_SYS_ID_LEN + 2);
1897 } else {
1898 memcpy(stop, last_lsp->hdr.lsp_id, sizeof(stop));
1899 }
1900
1901 memcpy(STREAM_DATA(circuit->snd_stream) + start_pointer, start,
1902 ISIS_SYS_ID_LEN + 2);
1903 memcpy(STREAM_DATA(circuit->snd_stream) + end_pointer, stop,
1904 ISIS_SYS_ID_LEN + 2);
1905 stream_set_endp(circuit->snd_stream, tlv_start);
1906 if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
1907 false, false)) {
1908 isis_free_tlvs(tlvs);
1909 return ISIS_WARNING;
1910 }
1911
1912 if (isis->debugs & DEBUG_SNP_PACKETS) {
1913 zlog_debug(
1914 "ISIS-Snp (%s): Sending L%d CSNP on %s, length %zd",
1915 circuit->area->area_tag, level,
1916 circuit->interface->name,
1917 stream_get_endp(circuit->snd_stream));
1918 log_multiline(LOG_DEBUG, " ", "%s",
1919 isis_format_tlvs(tlvs));
1920 if (isis->debugs & DEBUG_PACKET_DUMP)
1921 zlog_dump_data(
1922 STREAM_DATA(circuit->snd_stream),
1923 stream_get_endp(circuit->snd_stream));
1924 }
1925
1926 int retval = circuit->tx(circuit, level);
1927 if (retval != ISIS_OK) {
1928 flog_err(EC_ISIS_PACKET,
1929 "ISIS-Snp (%s): Send L%d CSNP on %s failed",
1930 circuit->area->area_tag, level,
1931 circuit->interface->name);
1932 isis_free_tlvs(tlvs);
1933 return retval;
1934 }
1935
1936 /*
1937 * Start lsp_id of the next CSNP should be one plus the
1938 * stop lsp_id in this current CSNP.
1939 */
1940 memcpy(start, stop, ISIS_SYS_ID_LEN + 2);
1941 loop = 0;
1942 for (int i = ISIS_SYS_ID_LEN + 1; i >= 0; --i) {
1943 if (start[i] < (uint8_t)0xff) {
1944 start[i] += 1;
1945 loop = 1;
1946 break;
1947 }
1948 }
1949 memset(stop, 0xff, ISIS_SYS_ID_LEN + 2);
1950 isis_free_tlvs(tlvs);
1951 }
1952
1953 return ISIS_OK;
1954 }
1955
1956 int send_l1_csnp(struct thread *thread)
1957 {
1958 struct isis_circuit *circuit;
1959 int retval = ISIS_OK;
1960
1961 circuit = THREAD_ARG(thread);
1962 assert(circuit);
1963
1964 circuit->t_send_csnp[0] = NULL;
1965
1966 if ((circuit->circ_type == CIRCUIT_T_BROADCAST
1967 && circuit->u.bc.is_dr[0])
1968 || circuit->circ_type == CIRCUIT_T_P2P) {
1969 send_csnp(circuit, 1);
1970 }
1971 /* set next timer thread */
1972 thread_add_timer(master, send_l1_csnp, circuit,
1973 isis_jitter(circuit->csnp_interval[0], CSNP_JITTER),
1974 &circuit->t_send_csnp[0]);
1975
1976 return retval;
1977 }
1978
1979 int send_l2_csnp(struct thread *thread)
1980 {
1981 struct isis_circuit *circuit;
1982 int retval = ISIS_OK;
1983
1984 circuit = THREAD_ARG(thread);
1985 assert(circuit);
1986
1987 circuit->t_send_csnp[1] = NULL;
1988
1989 if ((circuit->circ_type == CIRCUIT_T_BROADCAST
1990 && circuit->u.bc.is_dr[1])
1991 || circuit->circ_type == CIRCUIT_T_P2P) {
1992 send_csnp(circuit, 2);
1993 }
1994 /* set next timer thread */
1995 thread_add_timer(master, send_l2_csnp, circuit,
1996 isis_jitter(circuit->csnp_interval[1], CSNP_JITTER),
1997 &circuit->t_send_csnp[1]);
1998
1999 return retval;
2000 }
2001
2002 /*
2003 * 7.3.15.4 action on expiration of partial SNP interval
2004 * level 1
2005 */
2006 static int send_psnp(int level, struct isis_circuit *circuit)
2007 {
2008 if (circuit->circ_type == CIRCUIT_T_BROADCAST
2009 && circuit->u.bc.is_dr[level - 1])
2010 return ISIS_OK;
2011
2012 if (circuit->area->lspdb[level - 1] == NULL
2013 || dict_count(circuit->area->lspdb[level - 1]) == 0)
2014 return ISIS_OK;
2015
2016 if (!circuit->snd_stream)
2017 return ISIS_ERROR;
2018
2019 isis_circuit_stream(circuit, &circuit->snd_stream);
2020 fill_fixed_hdr((level == ISIS_LEVEL1) ? L1_PARTIAL_SEQ_NUM
2021 : L2_PARTIAL_SEQ_NUM,
2022 circuit->snd_stream);
2023
2024 size_t len_pointer = stream_get_endp(circuit->snd_stream);
2025 stream_putw(circuit->snd_stream, 0); /* length is filled in later */
2026 stream_put(circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
2027 stream_putc(circuit->snd_stream, circuit->idx);
2028
2029 struct isis_passwd *passwd = (level == ISIS_LEVEL1)
2030 ? &circuit->area->area_passwd
2031 : &circuit->area->domain_passwd;
2032
2033 struct isis_tlvs *tlvs = isis_alloc_tlvs();
2034
2035 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
2036 isis_tlvs_add_auth(tlvs, passwd);
2037
2038 size_t tlv_start = stream_get_endp(circuit->snd_stream);
2039 if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer, false,
2040 false)) {
2041 isis_free_tlvs(tlvs);
2042 return ISIS_WARNING;
2043 }
2044 isis_free_tlvs(tlvs);
2045
2046 uint16_t num_lsps =
2047 get_max_lsp_count(STREAM_WRITEABLE(circuit->snd_stream));
2048
2049 while (1) {
2050 tlvs = isis_alloc_tlvs();
2051 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
2052 isis_tlvs_add_auth(tlvs, passwd);
2053
2054 for (dnode_t *dnode =
2055 dict_first(circuit->area->lspdb[level - 1]);
2056 dnode; dnode = dict_next(circuit->area->lspdb[level - 1],
2057 dnode)) {
2058 struct isis_lsp *lsp = dnode_get(dnode);
2059
2060 if (ISIS_CHECK_FLAG(lsp->SSNflags, circuit))
2061 isis_tlvs_add_lsp_entry(tlvs, lsp);
2062
2063 if (tlvs->lsp_entries.count == num_lsps)
2064 break;
2065 }
2066
2067 if (!tlvs->lsp_entries.count) {
2068 isis_free_tlvs(tlvs);
2069 return ISIS_OK;
2070 }
2071
2072 stream_set_endp(circuit->snd_stream, tlv_start);
2073 if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
2074 false, false)) {
2075 isis_free_tlvs(tlvs);
2076 return ISIS_WARNING;
2077 }
2078
2079 if (isis->debugs & DEBUG_SNP_PACKETS) {
2080 zlog_debug(
2081 "ISIS-Snp (%s): Sending L%d PSNP on %s, length %zd",
2082 circuit->area->area_tag, level,
2083 circuit->interface->name,
2084 stream_get_endp(circuit->snd_stream));
2085 log_multiline(LOG_DEBUG, " ", "%s",
2086 isis_format_tlvs(tlvs));
2087 if (isis->debugs & DEBUG_PACKET_DUMP)
2088 zlog_dump_data(
2089 STREAM_DATA(circuit->snd_stream),
2090 stream_get_endp(circuit->snd_stream));
2091 }
2092
2093 int retval = circuit->tx(circuit, level);
2094 if (retval != ISIS_OK) {
2095 flog_err(EC_ISIS_PACKET,
2096 "ISIS-Snp (%s): Send L%d PSNP on %s failed",
2097 circuit->area->area_tag, level,
2098 circuit->interface->name);
2099 isis_free_tlvs(tlvs);
2100 return retval;
2101 }
2102
2103 /*
2104 * sending succeeded, we can clear SSN flags of this circuit
2105 * for the LSPs in list
2106 */
2107 struct isis_lsp_entry *entry_head;
2108 entry_head = (struct isis_lsp_entry *)tlvs->lsp_entries.head;
2109 for (struct isis_lsp_entry *entry = entry_head; entry;
2110 entry = entry->next)
2111 ISIS_CLEAR_FLAG(entry->lsp->SSNflags, circuit);
2112 isis_free_tlvs(tlvs);
2113 }
2114
2115 return ISIS_OK;
2116 }
2117
2118 int send_l1_psnp(struct thread *thread)
2119 {
2120
2121 struct isis_circuit *circuit;
2122 int retval = ISIS_OK;
2123
2124 circuit = THREAD_ARG(thread);
2125 assert(circuit);
2126
2127 circuit->t_send_psnp[0] = NULL;
2128
2129 send_psnp(1, circuit);
2130 /* set next timer thread */
2131 thread_add_timer(master, send_l1_psnp, circuit,
2132 isis_jitter(circuit->psnp_interval[0], PSNP_JITTER),
2133 &circuit->t_send_psnp[0]);
2134
2135 return retval;
2136 }
2137
2138 /*
2139 * 7.3.15.4 action on expiration of partial SNP interval
2140 * level 2
2141 */
2142 int send_l2_psnp(struct thread *thread)
2143 {
2144 struct isis_circuit *circuit;
2145 int retval = ISIS_OK;
2146
2147 circuit = THREAD_ARG(thread);
2148 assert(circuit);
2149
2150 circuit->t_send_psnp[1] = NULL;
2151
2152 send_psnp(2, circuit);
2153
2154 /* set next timer thread */
2155 thread_add_timer(master, send_l2_psnp, circuit,
2156 isis_jitter(circuit->psnp_interval[1], PSNP_JITTER),
2157 &circuit->t_send_psnp[1]);
2158
2159 return retval;
2160 }
2161
2162 /*
2163 * ISO 10589 - 7.3.14.3
2164 */
2165 void send_lsp(void *arg, struct isis_lsp *lsp, enum isis_tx_type tx_type)
2166 {
2167 struct isis_circuit *circuit = arg;
2168 int clear_srm = 1;
2169 int retval = ISIS_OK;
2170
2171 if (circuit->state != C_STATE_UP || circuit->is_passive == 1)
2172 goto out;
2173
2174 /*
2175 * Do not send if levels do not match
2176 */
2177 if (!(lsp->level & circuit->is_type))
2178 goto out;
2179
2180 /*
2181 * Do not send if we do not have adjacencies in state up on the circuit
2182 */
2183 if (circuit->upadjcount[lsp->level - 1] == 0)
2184 goto out;
2185
2186 /* stream_copy will assert and stop program execution if LSP is larger
2187 * than
2188 * the circuit's MTU. So handle and log this case here. */
2189 if (stream_get_endp(lsp->pdu) > stream_get_size(circuit->snd_stream)) {
2190 flog_err(
2191 EC_ISIS_PACKET,
2192 "ISIS-Upd (%s): Can't send L%d LSP %s, seq 0x%08" PRIx32
2193 ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
2194 "s on %s. LSP Size is %zu while interface stream size is %zu.",
2195 circuit->area->area_tag, lsp->level,
2196 rawlspid_print(lsp->hdr.lsp_id), lsp->hdr.seqno,
2197 lsp->hdr.checksum, lsp->hdr.rem_lifetime,
2198 circuit->interface->name, stream_get_endp(lsp->pdu),
2199 stream_get_size(circuit->snd_stream));
2200 if (isis->debugs & DEBUG_PACKET_DUMP)
2201 zlog_dump_data(STREAM_DATA(lsp->pdu),
2202 stream_get_endp(lsp->pdu));
2203 retval = ISIS_ERROR;
2204 goto out;
2205 }
2206
2207 /* copy our lsp to the send buffer */
2208 stream_copy(circuit->snd_stream, lsp->pdu);
2209
2210 if (tx_type == TX_LSP_CIRCUIT_SCOPED) {
2211 stream_putc_at(circuit->snd_stream, 4, FS_LINK_STATE);
2212 stream_putc_at(circuit->snd_stream, 7, L2_CIRCUIT_FLOODING_SCOPE);
2213 }
2214
2215 if (isis->debugs & DEBUG_UPDATE_PACKETS) {
2216 zlog_debug("ISIS-Upd (%s): Sending L%d LSP %s, seq 0x%08" PRIx32
2217 ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
2218 "s on %s",
2219 circuit->area->area_tag, lsp->level,
2220 rawlspid_print(lsp->hdr.lsp_id), lsp->hdr.seqno,
2221 lsp->hdr.checksum, lsp->hdr.rem_lifetime,
2222 circuit->interface->name);
2223 if (isis->debugs & DEBUG_PACKET_DUMP)
2224 zlog_dump_data(STREAM_DATA(circuit->snd_stream),
2225 stream_get_endp(circuit->snd_stream));
2226 }
2227
2228 clear_srm = 0;
2229 retval = circuit->tx(circuit, lsp->level);
2230 if (retval != ISIS_OK) {
2231 flog_err(EC_ISIS_PACKET,
2232 "ISIS-Upd (%s): Send L%d LSP on %s failed %s",
2233 circuit->area->area_tag, lsp->level,
2234 circuit->interface->name,
2235 (retval == ISIS_WARNING) ? "temporarily"
2236 : "permanently");
2237 }
2238
2239 out:
2240 if (clear_srm
2241 || (retval == ISIS_OK && circuit->circ_type == CIRCUIT_T_BROADCAST)
2242 || (retval != ISIS_OK && retval != ISIS_WARNING)) {
2243 /* SRM flag will trigger retransmission. We will not retransmit
2244 * if we
2245 * encountered a fatal error.
2246 * On success, they should only be cleared if it's a broadcast
2247 * circuit.
2248 * On a P2P circuit, we will wait for the ack from the neighbor
2249 * to clear
2250 * the fag.
2251 */
2252 isis_tx_queue_del(circuit->tx_queue, lsp);
2253 }
2254 }
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