2 * IS-IS Rout(e)ing protocol - isis_pdu.c
5 * Copyright (C) 2001,2002 Sampo Saaristo
6 * Tampere University of Technology
7 * Institute of Communications Engineering
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)
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
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
37 #include "lib_errors.h"
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"
63 static int ack_lsp(struct isis_lsp_hdr
*hdr
, struct isis_circuit
*circuit
,
70 (level
== IS_LEVEL_1
) ? L1_PARTIAL_SEQ_NUM
: L2_PARTIAL_SEQ_NUM
;
72 isis_circuit_stream(circuit
, &circuit
->snd_stream
);
74 fill_fixed_hdr(pdu_type
, circuit
->snd_stream
);
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 */
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
);
88 length
= (uint16_t)stream_get_endp(circuit
->snd_stream
);
89 /* Update PDU length */
90 stream_putw_at(circuit
->snd_stream
, lenp
, length
);
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
);
108 struct isis_circuit
*circuit
;
113 uint8_t sys_id
[ISIS_SYS_ID_LEN
];
120 uint8_t dis
[ISIS_SYS_ID_LEN
+ 1];
125 struct isis_tlvs
*tlvs
;
128 static int process_p2p_hello(struct iih_info
*iih
)
130 struct isis_threeway_adj
*tw_adj
= iih
->tlvs
->threeway_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",
135 iih
->circuit
->area
->area_tag
,
136 iih
->circuit
->interface
->name
,
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
)) {
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.",
148 iih
->circuit
->area
->area_tag
,
149 iih
->circuit
->interface
->name
);
157 * My interpertation of the ISO, if no adj exists we will create one for
160 struct isis_adjacency
*adj
= iih
->circuit
->u
.p2p
.neighbor
;
161 /* If an adjacency exists, check it is with the source of the hello
164 if (memcmp(iih
->sys_id
, adj
->sysid
, ISIS_SYS_ID_LEN
)) {
166 "hello source and adjacency do not match, set adj down\n");
167 isis_adj_state_change(adj
, ISIS_ADJ_DOWN
,
172 if (!adj
|| adj
->level
!= iih
->circ_type
) {
174 adj
= isis_new_adj(iih
->sys_id
, NULL
, iih
->circ_type
,
177 adj
->level
= iih
->circ_type
;
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.
186 adj
->circuit_t
= iih
->circ_type
;
187 isis_adj_state_change(adj
, ISIS_ADJ_INITIALIZING
, NULL
);
188 adj
->sys_type
= ISIS_SYSTYPE_UNKNOWN
;
191 if (tw_adj
&& adj
->threeway_state
== ISIS_THREEWAY_DOWN
)
192 adj
->ext_circuit_id
= tw_adj
->local_circuit_id
;
194 /* 8.2.6 Monitoring point-to-point adjacencies */
195 adj
->hold_time
= iih
->holdtime
;
196 adj
->last_upd
= time(NULL
);
199 isis_tlvs_to_adj(iih
->tlvs
, adj
, &changed
);
200 changed
|= tlvs_to_adj_mt_set(iih
->tlvs
, iih
->v4_usable
, iih
->v6_usable
,
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]);
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
,
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
)
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
) {
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
,
235 if (adj
->adj_state
!= ISIS_ADJ_UP
) {
236 /* (7) reject - wrong system type event
238 zlog_warn("wrongSystemType");
240 } else if (adj
->adj_usage
== ISIS_ADJ_LEVEL1
) {
241 /* (6) down - wrong system */
242 isis_adj_state_change(adj
,
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
) {
254 if (adj
->adj_state
!= ISIS_ADJ_UP
255 || adj
->adj_usage
== ISIS_ADJ_LEVEL1
) {
256 isis_adj_process_threeway(adj
, tw_adj
,
258 } else if ((adj
->adj_usage
259 == ISIS_ADJ_LEVEL1AND2
)
261 == ISIS_ADJ_LEVEL2
)) {
262 /* (8) down - wrong system */
263 isis_adj_state_change(adj
,
269 if (adj
->adj_state
!= ISIS_ADJ_UP
270 || adj
->adj_usage
== ISIS_ADJ_LEVEL2
) {
271 isis_adj_process_threeway(adj
, tw_adj
,
273 } else if ((adj
->adj_usage
== ISIS_ADJ_LEVEL1
)
275 == ISIS_ADJ_LEVEL1AND2
)) {
276 /* (8) down - wrong system */
277 isis_adj_state_change(adj
,
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
)
289 == ISIS_ADJ_LEVEL2
)) {
290 /* (8) down - wrong system */
291 isis_adj_state_change(adj
,
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
) {
303 if (adj
->adj_state
!= ISIS_ADJ_UP
) {
304 /* (5) reject - wrong system type event
306 zlog_warn("wrongSystemType");
308 } else if ((adj
->adj_usage
309 == ISIS_ADJ_LEVEL1AND2
)
311 == ISIS_ADJ_LEVEL2
)) {
312 /* (6) down - wrong system */
313 isis_adj_state_change(adj
,
318 case IS_LEVEL_1_AND_2
:
320 if (adj
->adj_state
!= ISIS_ADJ_UP
321 || adj
->adj_usage
== ISIS_ADJ_LEVEL2
) {
322 isis_adj_process_threeway(adj
, tw_adj
,
324 } else if (adj
->adj_usage
325 == ISIS_ADJ_LEVEL1AND2
) {
326 /* (6) down - wrong system */
327 isis_adj_state_change(adj
,
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
,
342 /* 8.2.5.2 b) 2)is_type L1 and adj is up */
344 isis_adj_state_change(adj
, ISIS_ADJ_DOWN
,
345 "Down - Area Mismatch");
348 /* 8.2.5.2 b 3 If the system is L2 or L1L2 - table 8 */
350 switch (iih
->circ_type
) {
352 if (adj
->adj_state
!= ISIS_ADJ_UP
) {
353 /* (6) reject - Area Mismatch event */
354 zlog_warn("AreaMismatch");
356 } else if (adj
->adj_usage
== ISIS_ADJ_LEVEL1
) {
357 /* (7) down - area mismatch */
358 isis_adj_state_change(adj
,
362 } else if ((adj
->adj_usage
363 == ISIS_ADJ_LEVEL1AND2
)
365 == ISIS_ADJ_LEVEL2
)) {
366 /* (7) down - wrong system */
367 isis_adj_state_change(adj
,
372 case IS_LEVEL_1_AND_2
:
374 if (adj
->adj_state
!= ISIS_ADJ_UP
375 || adj
->adj_usage
== ISIS_ADJ_LEVEL2
) {
376 isis_adj_process_threeway(adj
, tw_adj
,
378 } else if (adj
->adj_usage
== ISIS_ADJ_LEVEL1
) {
379 /* (7) down - wrong system */
380 isis_adj_state_change(adj
,
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(
391 /* (7) down - area mismatch */
392 isis_adj_state_change(
401 /* down - area mismatch */
402 isis_adj_state_change(adj
, ISIS_ADJ_DOWN
, "Area Mismatch");
405 if (adj
->adj_state
== ISIS_ADJ_UP
&& changed
) {
406 lsp_regenerate_schedule(adj
->circuit
->area
,
407 isis_adj_usage2levels(adj
->adj_usage
),
411 /* 8.2.5.2 c) if the action was up - comparing circuit IDs */
412 /* FIXME - Missing parts */
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...
417 switch (adj
->adj_usage
) {
418 case ISIS_ADJ_LEVEL1
:
419 adj
->sys_type
= ISIS_SYSTYPE_L1_IS
;
421 case ISIS_ADJ_LEVEL2
:
422 adj
->sys_type
= ISIS_SYSTYPE_L2_IS
;
424 case ISIS_ADJ_LEVEL1AND2
:
425 adj
->sys_type
= ISIS_SYSTYPE_L2_IS
;
428 adj
->sys_type
= ISIS_SYSTYPE_UNKNOWN
;
432 if (isis
->debugs
& DEBUG_ADJ_PACKETS
) {
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
);
445 static int process_lan_hello(struct iih_info
*iih
)
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
)) {
453 /* Do as in 8.4.2.5 */
454 adj
= isis_new_adj(iih
->sys_id
, iih
->ssnpa
, iih
->level
,
458 memcpy(adj
->snpa
, iih
->ssnpa
, 6);
460 memset(adj
->snpa
, ' ', 6);
462 adj
->level
= iih
->level
;
464 isis_adj_state_change(adj
, ISIS_ADJ_INITIALIZING
, NULL
);
466 if (iih
->level
== IS_LEVEL_1
)
467 adj
->sys_type
= ISIS_SYSTYPE_L1_IS
;
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]);
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
;
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);
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);
496 isis_tlvs_to_adj(iih
->tlvs
, adj
, &changed
);
497 changed
|= tlvs_to_adj_mt_set(iih
->tlvs
, iih
->v4_usable
, iih
->v6_usable
,
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
,
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"
509 bool own_snpa_found
=
510 isis_tlvs_own_snpa_found(iih
->tlvs
, iih
->circuit
->u
.bc
.snpa
);
512 if (adj
->adj_state
!= ISIS_ADJ_UP
) {
513 if (own_snpa_found
) {
514 isis_adj_state_change(
516 "own SNPA found in LAN Neighbours TLV");
519 if (!own_snpa_found
) {
520 isis_adj_state_change(
521 adj
, ISIS_ADJ_INITIALIZING
,
522 "own SNPA not found in LAN Neighbours TLV");
526 if (adj
->adj_state
== ISIS_ADJ_UP
&& changed
)
527 lsp_regenerate_schedule(adj
->circuit
->area
, iih
->level
, 0);
529 if (isis
->debugs
& DEBUG_ADJ_PACKETS
) {
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
));
541 static int pdu_len_validate(uint16_t pdu_len
, struct isis_circuit
*circuit
)
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
))
548 if (pdu_len
< stream_get_endp(circuit
->rcv_stream
))
549 stream_set_endp(circuit
->rcv_stream
, pdu_len
);
553 static int process_hello(uint8_t pdu_type
, struct isis_circuit
*circuit
,
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
564 const char *pdu_name
=
567 : (level
== ISIS_LEVEL1
) ? "L1 LAN IIH" : "L2 LAN IIH";
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
));
584 if (circuit
->circ_type
!= CIRCUIT_T_P2P
) {
585 zlog_warn("p2p hello on non p2p circuit");
587 isis_notif_reject_adjacency(
588 circuit
, "p2p hello on non p2p circuit",
590 #endif /* ifndef FABRICD */
594 if (circuit
->circ_type
!= CIRCUIT_T_BROADCAST
) {
595 zlog_warn("lan hello on non broadcast circuit");
597 isis_notif_reject_adjacency(
598 circuit
, "lan hello on non broadcast circuit",
600 #endif /* ifndef FABRICD */
604 if (circuit
->ext_domain
) {
606 "level %d LAN Hello received over circuit with externalDomain = true",
609 isis_notif_reject_adjacency(
611 "LAN Hello received over circuit with externalDomain = true",
613 #endif /* ifndef FABRICD */
617 if (!(circuit
->is_type
& level
)) {
618 if (isis
->debugs
& DEBUG_ADJ_PACKETS
) {
620 "ISIS-Adj (%s): Interface level mismatch, %s",
621 circuit
->area
->area_tag
,
622 circuit
->interface
->name
);
625 isis_notif_reject_adjacency(
626 circuit
, "Interface level mismatch", raw_pdu
);
627 #endif /* ifndef FABRICD */
632 struct iih_info iih
= {
633 .circuit
= circuit
, .ssnpa
= ssnpa
, .level
= level
};
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
);
642 iih
.circuit_id
= stream_getc(circuit
->rcv_stream
);
644 iih
.priority
= stream_getc(circuit
->rcv_stream
);
645 stream_get(iih
.dis
, circuit
->rcv_stream
, ISIS_SYS_ID_LEN
+ 1);
648 if (pdu_len_validate(iih
.pdu_len
, circuit
)) {
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
);
654 isis_notif_reject_adjacency(circuit
, "Invalid PDU length",
656 #endif /* ifndef FABRICD */
660 if (!p2p_hello
&& !(level
& iih
.circ_type
)) {
661 flog_err(EC_ISIS_PACKET
,
662 "Level %d LAN Hello with Circuit Type %d", level
,
665 isis_notif_reject_adjacency(
666 circuit
, "LAN Hello with wrong IS-level", raw_pdu
);
667 #endif /* ifndef FABRICD */
671 const char *error_log
;
672 int retval
= ISIS_WARNING
;
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
);
678 isis_notif_reject_adjacency(circuit
, "Failed to unpack TLVs",
680 #endif /* ifndef FABRICD */
684 if (!iih
.tlvs
->area_addresses
.count
) {
685 zlog_warn("No Area addresses TLV in %s", pdu_name
);
687 /* send northbound notification */
688 isis_notif_area_mismatch(circuit
, raw_pdu
);
689 #endif /* ifndef FABRICD */
693 if (!iih
.tlvs
->protocols_supported
.count
) {
694 zlog_warn("No supported protocols TLV in %s", pdu_name
);
696 isis_notif_reject_adjacency(
697 circuit
, "No supported protocols TLV", raw_pdu
);
698 #endif /* ifndef FABRICD */
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",
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
,
717 #endif /* ifndef FABRICD */
721 if (!memcmp(iih
.sys_id
, isis
->sysid
, ISIS_SYS_ID_LEN
)) {
723 "ISIS-Adj (%s): Received IIH with own sysid - discard",
724 circuit
->area
->area_tag
);
726 isis_notif_reject_adjacency(
727 circuit
, "Received IIH with our own sysid", raw_pdu
);
728 #endif /* ifndef FABRICD */
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
) {
739 "ISIS-Adj (%s): Area mismatch, level %d IIH on %s",
740 circuit
->area
->area_tag
, level
,
741 circuit
->interface
->name
);
744 /* send northbound notification */
745 isis_notif_area_mismatch(circuit
, raw_pdu
);
746 #endif /* ifndef FABRICD */
750 iih
.v4_usable
= (fabricd_ip_addrs(circuit
)
751 && iih
.tlvs
->ipv4_address
.count
);
753 iih
.v6_usable
= (circuit
->ipv6_link
&& listcount(circuit
->ipv6_link
)
754 && iih
.tlvs
->ipv6_address
.count
);
756 if (!iih
.v4_usable
&& !iih
.v6_usable
) {
757 if (isis
->debugs
& DEBUG_ADJ_PACKETS
) {
759 "ISIS-Adj (%s): Neither IPv4 nor IPv6 considered usable. Ignoring IIH",
760 circuit
->area
->area_tag
);
763 isis_notif_reject_adjacency(
764 circuit
, "Neither IPv4 not IPv6 considered usable",
766 #endif /* ifndef FABRICD */
770 retval
= p2p_hello
? process_p2p_hello(&iih
) : process_lan_hello(&iih
);
772 isis_free_tlvs(iih
.tlvs
);
777 static void lsp_flood_or_update(struct isis_lsp
*lsp
,
778 struct isis_circuit
*circuit
,
782 lsp_flood(lsp
, circuit
);
784 fabricd_update_lsp_no_flood(lsp
, circuit
);
788 * Process Level 1/2 Link State
790 * Section 7.3.15.1 - Action on receipt of a link state PDU
792 static int process_lsp(uint8_t pdu_type
, struct isis_circuit
*circuit
,
793 const uint8_t *ssnpa
, uint8_t max_area_addrs
)
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
];
801 stream_get_from(raw_pdu
, circuit
->rcv_stream
, pdu_start
,
802 pdu_end
- pdu_start
);
804 if (pdu_type
== FS_LINK_STATE
) {
807 if (max_area_addrs
!= L2_CIRCUIT_FLOODING_SCOPE
)
810 circuit_scoped
= true;
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);
818 if (pdu_type
== L1_LINK_STATE
)
822 circuit_scoped
= false;
825 if (isis
->debugs
& DEBUG_UPDATE_PACKETS
) {
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
));
838 struct isis_lsp_hdr hdr
= {};
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
);
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 */
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
),
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
);
870 /* lsp is_type check */
871 if ((hdr
.lsp_bits
& IS_LEVEL_1
) != IS_LEVEL_1
) {
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 */
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)) {
885 "ISIS-Upd (%s): LSP %s invalid LSP checksum 0x%04" PRIx16
,
886 circuit
->area
->area_tag
, rawlspid_print(hdr
.lsp_id
),
891 /* 7.3.15.1 a) 1 - external domain circuit will discard lsps */
892 if (circuit
->ext_domain
) {
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
),
901 /* 7.3.15.1 a) 2,3 - manualL2OnlyMode not implemented */
902 if (!(circuit
->is_type
& level
)) {
904 "ISIS-Upd (%s): LSP %s received at level %d over circuit of"
906 circuit
->area
->area_tag
, rawlspid_print(hdr
.lsp_id
),
907 level
, circuit_t2string(circuit
->is_type
));
911 struct isis_tlvs
*tlvs
= NULL
;
912 int retval
= ISIS_WARNING
;
913 const char *error_log
;
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",
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
927 isis_notif_lsp_error(circuit
, rawlspid_print(hdr
.lsp_id
),
929 #endif /* ifndef FABRICD */
933 /* 7.3.15.1 a) 4 - need to make sure IDLength matches */
935 /* 7.3.15.1 a) 5 - maximum area match, can be ommited since we only use
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",
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
,
955 #endif /* ifndef FABRICD */
959 /* Find the LSP in our database and compare it to this Link State header
961 struct isis_lsp
*lsp
=
962 lsp_search(hdr
.lsp_id
, circuit
->area
->lspdb
[level
- 1]);
965 comp
= lsp_compare(circuit
->area
->area_tag
, lsp
, hdr
.seqno
,
966 hdr
.checksum
, hdr
.rem_lifetime
);
967 if (lsp
&& (lsp
->own_lsp
))
970 /* 7.3.15.1 a) 6 - Must check that we have an adjacency of the same
972 /* for broadcast circuits, snpa should be compared */
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
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 */
987 /* for non broadcast, we just need to find same level adj */
989 /* If no adj, or no sharing of level */
990 if (!circuit
->u
.p2p
.neighbor
) {
994 if (((level
== IS_LEVEL_1
)
995 && (circuit
->u
.p2p
.neighbor
->adj_usage
997 || ((level
== IS_LEVEL_2
)
998 && (circuit
->u
.p2p
.neighbor
->adj_usage
999 == ISIS_ADJ_LEVEL1
)))
1007 /* 7.3.15.1 a) 7 - Passwords for level 1 - not implemented */
1009 /* 7.3.15.1 a) 8 - Passwords for level 2 - not implemented */
1011 /* 7.3.15.1 a) 9 - OriginatingLSPBufferSize - not implemented FIXME: do
1014 /* 7.3.16.2 - If this is an LSP from another IS with identical seq_num
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
),
1024 hdr
.rem_lifetime
= 0;
1025 lsp_confusion
= true;
1027 lsp_confusion
= false;
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) {
1032 /* 7.3.16.4 a) 1) No LSP in db -> send an ack, but don't
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? */
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
,
1049 lsp_flood_or_update(lsp
, NULL
,
1052 ISIS_FLAGS_CLEAR_ALL(
1053 lsp
->SSNflags
); /* FIXME:
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
) {
1069 if (circuit
->circ_type
1070 != CIRCUIT_T_BROADCAST
)
1075 } /* 7.3.16.4 b) 2) */
1076 else if (comp
== LSP_EQUAL
) {
1078 isis_tx_queue_del(circuit
->tx_queue
,
1081 if (circuit
->circ_type
1082 != CIRCUIT_T_BROADCAST
)
1083 ISIS_SET_FLAG(lsp
->SSNflags
,
1085 } /* 7.3.16.4 b) 3) */
1087 isis_tx_queue_add(circuit
->tx_queue
,
1088 lsp
, TX_LSP_NORMAL
);
1089 ISIS_CLEAR_FLAG(lsp
->SSNflags
, circuit
);
1091 } else if (lsp
->hdr
.rem_lifetime
!= 0) {
1092 /* our own LSP -> 7.3.16.4 c) */
1093 if (comp
== LSP_NEWER
) {
1095 if (lsp
->hdr
.seqno
< hdr
.seqno
) {
1098 isis_notif_seqno_skipped(
1103 #endif /* ifndef FABRICD */
1104 lsp_inc_seqno(lsp
, hdr
.seqno
);
1105 lsp_flood_or_update(lsp
, NULL
,
1108 isis_tx_queue_add(circuit
->tx_queue
,
1109 lsp
, TX_LSP_NORMAL
);
1110 ISIS_CLEAR_FLAG(lsp
->SSNflags
, circuit
);
1112 if (isis
->debugs
& DEBUG_UPDATE_PACKETS
)
1114 "ISIS-Upd (%s): (1) "
1115 "re-originating LSP %s new seq "
1117 circuit
->area
->area_tag
,
1118 rawlspid_print(hdr
.lsp_id
),
1121 /* our own LSP with 0 remaining life time */
1123 /* send northbound notification */
1124 isis_notif_own_lsp_purge(
1125 circuit
, rawlspid_print(hdr
.lsp_id
));
1126 #endif /* ifndef FABRICD */
1131 /* 7.3.15.1 c) - If this is our own lsp and we don't have it initiate a
1133 if (memcmp(hdr
.lsp_id
, isis
->sysid
, ISIS_SYS_ID_LEN
) == 0) {
1135 /* 7.3.16.4: initiate a purge */
1136 lsp_purge_non_exist(level
, &hdr
, circuit
->area
);
1140 /* 7.3.15.1 d) - If this is our own lsp and we have it */
1142 /* In 7.3.16.1, If an Intermediate system R somewhere in the
1144 * has information that the current sequence number for source S
1146 * "greater" than that held by S, ... */
1148 if (comp
== LSP_NEWER
) {
1150 lsp_inc_seqno(lsp
, hdr
.seqno
);
1152 /* send northbound notification */
1153 isis_notif_seqno_skipped(circuit
,
1154 rawlspid_print(hdr
.lsp_id
));
1155 #endif /* ifndef FABRICD */
1156 if (isis
->debugs
& DEBUG_UPDATE_PACKETS
) {
1158 "ISIS-Upd (%s): (2) re-originating LSP %s new seq 0x%08" PRIx32
,
1159 circuit
->area
->area_tag
,
1160 rawlspid_print(hdr
.lsp_id
),
1163 lsp_flood(lsp
, NULL
);
1164 } else if (comp
== LSP_EQUAL
) {
1165 isis_tx_queue_del(circuit
->tx_queue
, lsp
);
1166 if (circuit
->circ_type
!= CIRCUIT_T_BROADCAST
)
1167 ISIS_SET_FLAG(lsp
->SSNflags
, circuit
);
1169 isis_tx_queue_add(circuit
->tx_queue
, lsp
,
1171 ISIS_CLEAR_FLAG(lsp
->SSNflags
, circuit
);
1174 /* 7.3.15.1 e) - This lsp originated on another system */
1176 /* 7.3.15.1 e) 1) LSP newer than the one in db or no LSP in db
1178 if ((!lsp
|| comp
== LSP_NEWER
)) {
1180 * If this lsp is a frag, need to see if we have zero
1183 struct isis_lsp
*lsp0
= NULL
;
1184 if (LSP_FRAGMENT(hdr
.lsp_id
) != 0) {
1185 uint8_t lspid
[ISIS_SYS_ID_LEN
+ 2];
1186 memcpy(lspid
, hdr
.lsp_id
, ISIS_SYS_ID_LEN
+ 1);
1187 LSP_FRAGMENT(lspid
) = 0;
1189 lspid
, circuit
->area
->lspdb
[level
- 1]);
1192 "Got lsp frag, while zero lsp not in database");
1198 lsp
= lsp_new_from_recv(
1199 &hdr
, tlvs
, circuit
->rcv_stream
, lsp0
,
1200 circuit
->area
, level
);
1203 circuit
->area
->lspdb
[level
- 1]);
1204 } else /* exists, so we overwrite */
1206 lsp_update(lsp
, &hdr
, tlvs
, circuit
->rcv_stream
,
1207 circuit
->area
, level
, false);
1210 lsp_flood_or_update(lsp
, circuit
, circuit_scoped
);
1213 if (circuit
->circ_type
!= CIRCUIT_T_BROADCAST
)
1214 ISIS_SET_FLAG(lsp
->SSNflags
, circuit
);
1217 /* 7.3.15.1 e) 2) LSP equal to the one in db */
1218 else if (comp
== LSP_EQUAL
) {
1219 isis_tx_queue_del(circuit
->tx_queue
, lsp
);
1220 lsp_update(lsp
, &hdr
, tlvs
, circuit
->rcv_stream
,
1221 circuit
->area
, level
, false);
1223 if (circuit
->circ_type
!= CIRCUIT_T_BROADCAST
)
1224 ISIS_SET_FLAG(lsp
->SSNflags
, circuit
);
1226 /* 7.3.15.1 e) 3) LSP older than the one in db */
1228 isis_tx_queue_add(circuit
->tx_queue
, lsp
,
1230 ISIS_CLEAR_FLAG(lsp
->SSNflags
, circuit
);
1237 fabricd_trigger_csnp(circuit
->area
, circuit_scoped
);
1239 isis_free_tlvs(tlvs
);
1244 * Process Sequence Numbers
1246 * Section 7.3.15.2 - Action on receipt of a sequence numbers PDU
1249 static int process_snp(uint8_t pdu_type
, struct isis_circuit
*circuit
,
1250 const uint8_t *ssnpa
)
1253 size_t pdu_start
= stream_get_getp(circuit
->rcv_stream
);
1254 size_t pdu_end
= stream_get_endp(circuit
->rcv_stream
);
1255 char raw_pdu
[pdu_end
- pdu_start
];
1256 #endif /* ifndef FABRICD */
1258 bool is_csnp
= (pdu_type
== L1_COMPLETE_SEQ_NUM
1259 || pdu_type
== L2_COMPLETE_SEQ_NUM
);
1260 char typechar
= is_csnp
? 'C' : 'P';
1261 int level
= (pdu_type
== L1_COMPLETE_SEQ_NUM
1262 || pdu_type
== L1_PARTIAL_SEQ_NUM
)
1266 uint16_t pdu_len
= stream_getw(circuit
->rcv_stream
);
1267 uint8_t rem_sys_id
[ISIS_SYS_ID_LEN
];
1269 stream_get(rem_sys_id
, circuit
->rcv_stream
, ISIS_SYS_ID_LEN
);
1270 stream_forward_getp(circuit
->rcv_stream
, 1); /* Circuit ID - unused */
1272 uint8_t start_lsp_id
[ISIS_SYS_ID_LEN
+ 2] = {};
1273 uint8_t stop_lsp_id
[ISIS_SYS_ID_LEN
+ 2] = {};
1276 stream_get(start_lsp_id
, circuit
->rcv_stream
,
1277 ISIS_SYS_ID_LEN
+ 2);
1278 stream_get(stop_lsp_id
, circuit
->rcv_stream
,
1279 ISIS_SYS_ID_LEN
+ 2);
1282 if (pdu_len_validate(pdu_len
, circuit
)) {
1283 zlog_warn("Received a CSNP with bogus length %d", pdu_len
);
1284 return ISIS_WARNING
;
1287 if (isis
->debugs
& DEBUG_SNP_PACKETS
) {
1289 "ISIS-Snp (%s): Rcvd L%d %cSNP on %s, cirType %s, cirID %u",
1290 circuit
->area
->area_tag
, level
, typechar
,
1291 circuit
->interface
->name
,
1292 circuit_t2string(circuit
->is_type
),
1293 circuit
->circuit_id
);
1294 if (isis
->debugs
& DEBUG_PACKET_DUMP
)
1295 zlog_dump_data(STREAM_DATA(circuit
->rcv_stream
),
1296 stream_get_endp(circuit
->rcv_stream
));
1299 /* 7.3.15.2 a) 1 - external domain circuit will discard snp pdu */
1300 if (circuit
->ext_domain
) {
1303 "ISIS-Snp (%s): Rcvd L%d %cSNP on %s, "
1304 "skipping: circuit externalDomain = true",
1305 circuit
->area
->area_tag
, level
, typechar
,
1306 circuit
->interface
->name
);
1311 /* 7.3.15.2 a) 2,3 - manualL2OnlyMode not implemented */
1312 if (!(circuit
->is_type
& level
)) {
1314 "ISIS-Snp (%s): Rcvd L%d %cSNP on %s, "
1315 "skipping: circuit type %s does not match level %d",
1316 circuit
->area
->area_tag
, level
, typechar
,
1317 circuit
->interface
->name
,
1318 circuit_t2string(circuit
->is_type
), level
);
1323 /* 7.3.15.2 a) 4 - not applicable for CSNP only PSNPs on broadcast */
1324 if (!is_csnp
&& (circuit
->circ_type
== CIRCUIT_T_BROADCAST
)
1325 && !circuit
->u
.bc
.is_dr
[level
- 1]) {
1327 "ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s, "
1328 "skipping: we are not the DIS",
1329 circuit
->area
->area_tag
, level
, typechar
,
1330 snpa_print(ssnpa
), circuit
->interface
->name
);
1335 /* 7.3.15.2 a) 5 - need to make sure IDLength matches - already checked
1338 /* 7.3.15.2 a) 6 - maximum area match, can be ommited since we only use
1340 * - already checked */
1342 /* 7.3.15.2 a) 7 - Must check that we have an adjacency of the same
1344 /* for broadcast circuits, snpa should be compared */
1345 /* FIXME : Do we need to check SNPA? */
1346 if (circuit
->circ_type
== CIRCUIT_T_BROADCAST
) {
1347 if (!isis_adj_lookup(rem_sys_id
,
1348 circuit
->u
.bc
.adjdb
[level
- 1]))
1349 return ISIS_OK
; /* Silently discard */
1351 if (!fabricd
&& !circuit
->u
.p2p
.neighbor
) {
1352 zlog_warn("no p2p neighbor on circuit %s",
1353 circuit
->interface
->name
);
1354 return ISIS_OK
; /* Silently discard */
1358 struct isis_tlvs
*tlvs
;
1359 int retval
= ISIS_WARNING
;
1360 const char *error_log
;
1362 if (isis_unpack_tlvs(STREAM_READABLE(circuit
->rcv_stream
),
1363 circuit
->rcv_stream
, &tlvs
, &error_log
)) {
1364 zlog_warn("Something went wrong unpacking the SNP: %s",
1369 struct isis_passwd
*passwd
= (level
== IS_LEVEL_1
)
1370 ? &circuit
->area
->area_passwd
1371 : &circuit
->area
->domain_passwd
;
1372 if (CHECK_FLAG(passwd
->snp_auth
, SNP_AUTH_RECV
)) {
1373 int auth_code
= isis_tlvs_auth_is_valid(
1374 tlvs
, passwd
, circuit
->rcv_stream
, false);
1375 if (auth_code
!= ISIS_AUTH_OK
) {
1376 isis_event_auth_failure(circuit
->area
->area_tag
,
1377 "SNP authentication failure",
1380 /* send northbound notification */
1381 stream_get_from(raw_pdu
, circuit
->rcv_stream
, pdu_start
,
1382 pdu_end
- pdu_start
);
1383 if (auth_code
== ISIS_AUTH_FAILURE
)
1384 isis_notif_authentication_failure(circuit
,
1386 else /* AUTH_TYPE_FAILURE or NO_VALIDATOR */
1387 isis_notif_authentication_type_failure(circuit
,
1389 #endif /* ifndef FABRICD */
1394 struct isis_lsp_entry
*entry_head
=
1395 (struct isis_lsp_entry
*)tlvs
->lsp_entries
.head
;
1397 /* debug isis snp-packets */
1398 if (isis
->debugs
& DEBUG_SNP_PACKETS
) {
1399 zlog_debug("ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s",
1400 circuit
->area
->area_tag
, level
, typechar
,
1401 snpa_print(ssnpa
), circuit
->interface
->name
);
1402 for (struct isis_lsp_entry
*entry
= entry_head
; entry
;
1403 entry
= entry
->next
) {
1405 "ISIS-Snp (%s): %cSNP entry %s, seq 0x%08" PRIx32
1406 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16
"s",
1407 circuit
->area
->area_tag
, typechar
,
1408 rawlspid_print(entry
->id
), entry
->seqno
,
1409 entry
->checksum
, entry
->rem_lifetime
);
1413 bool resync_needed
= false;
1415 /* 7.3.15.2 b) Actions on LSP_ENTRIES reported */
1416 for (struct isis_lsp_entry
*entry
= entry_head
; entry
;
1417 entry
= entry
->next
) {
1418 struct isis_lsp
*lsp
=
1419 lsp_search(entry
->id
, circuit
->area
->lspdb
[level
- 1]);
1420 bool own_lsp
= !memcmp(entry
->id
, isis
->sysid
, ISIS_SYS_ID_LEN
);
1422 /* 7.3.15.2 b) 1) is this LSP newer */
1423 int cmp
= lsp_compare(circuit
->area
->area_tag
, lsp
,
1424 entry
->seqno
, entry
->checksum
,
1425 entry
->rem_lifetime
);
1426 /* 7.3.15.2 b) 2) if it equals, clear SRM on p2p */
1427 if (cmp
== LSP_EQUAL
) {
1428 /* if (circuit->circ_type !=
1429 * CIRCUIT_T_BROADCAST) */
1430 isis_tx_queue_del(circuit
->tx_queue
, lsp
);
1432 /* 7.3.15.2 b) 3) if it is older, clear SSN and set SRM
1434 else if (cmp
== LSP_OLDER
) {
1435 ISIS_CLEAR_FLAG(lsp
->SSNflags
, circuit
);
1436 isis_tx_queue_add(circuit
->tx_queue
, lsp
,
1439 /* 7.3.15.2 b) 4) if it is newer, set SSN and clear SRM
1443 lsp_inc_seqno(lsp
, entry
->seqno
);
1444 isis_tx_queue_add(circuit
->tx_queue
, lsp
,
1447 ISIS_SET_FLAG(lsp
->SSNflags
, circuit
);
1448 /* if (circuit->circ_type !=
1449 * CIRCUIT_T_BROADCAST) */
1450 isis_tx_queue_del(circuit
->tx_queue
, lsp
);
1451 resync_needed
= true;
1455 /* 7.3.15.2 b) 5) if it was not found, and all of those
1457 * insert it and set SSN on it */
1458 if (entry
->rem_lifetime
&& entry
->checksum
1459 && entry
->seqno
&& memcmp(entry
->id
, isis
->sysid
,
1461 struct isis_lsp
*lsp0
= NULL
;
1463 if (LSP_FRAGMENT(entry
->id
)) {
1464 uint8_t lspid
[ISIS_SYS_ID_LEN
+ 2];
1466 memcpy(lspid
, entry
->id
,
1467 ISIS_SYS_ID_LEN
+ 1);
1468 LSP_FRAGMENT(lspid
) = 0;
1471 circuit
->area
->lspdb
[level
- 1]);
1473 zlog_debug("Got lsp frag in snp, while zero not in database");
1477 lsp
= lsp_new(circuit
->area
, entry
->id
,
1478 entry
->rem_lifetime
, 0, 0,
1479 entry
->checksum
, lsp0
, level
);
1481 circuit
->area
->lspdb
[level
- 1]);
1483 lsp_set_all_srmflags(lsp
, false);
1484 ISIS_SET_FLAG(lsp
->SSNflags
, circuit
);
1485 resync_needed
= true;
1490 /* 7.3.15.2 c) on CSNP set SRM for all in range which were not reported
1494 * Build a list from our own LSP db bounded with
1495 * start_lsp_id and stop_lsp_id
1497 struct list
*lsp_list
= list_new();
1498 lsp_build_list_nonzero_ht(start_lsp_id
, stop_lsp_id
, lsp_list
,
1499 circuit
->area
->lspdb
[level
- 1]);
1501 /* Fixme: Find a better solution */
1502 struct listnode
*node
, *nnode
;
1503 struct isis_lsp
*lsp
;
1504 for (struct isis_lsp_entry
*entry
= entry_head
; entry
;
1505 entry
= entry
->next
) {
1506 for (ALL_LIST_ELEMENTS(lsp_list
, node
, nnode
, lsp
)) {
1507 if (lsp_id_cmp(lsp
->hdr
.lsp_id
, entry
->id
)
1509 list_delete_node(lsp_list
, node
);
1515 /* on remaining LSPs we set SRM (neighbor knew not of) */
1516 for (ALL_LIST_ELEMENTS_RO(lsp_list
, node
, lsp
)) {
1517 isis_tx_queue_add(circuit
->tx_queue
, lsp
, TX_LSP_NORMAL
);
1518 resync_needed
= true;
1522 list_delete(&lsp_list
);
1525 if (fabricd_initial_sync_is_complete(circuit
->area
) && resync_needed
)
1526 zlog_warn("OpenFabric: Needed to resync LSPDB using CSNP!");
1530 isis_free_tlvs(tlvs
);
1534 static int pdu_size(uint8_t pdu_type
, uint8_t *size
)
1539 *size
= ISIS_LANHELLO_HDRLEN
;
1542 *size
= ISIS_P2PHELLO_HDRLEN
;
1547 *size
= ISIS_LSP_HDR_LEN
;
1549 case L1_COMPLETE_SEQ_NUM
:
1550 case L2_COMPLETE_SEQ_NUM
:
1551 *size
= ISIS_CSNP_HDRLEN
;
1553 case L1_PARTIAL_SEQ_NUM
:
1554 case L2_PARTIAL_SEQ_NUM
:
1555 *size
= ISIS_PSNP_HDRLEN
;
1560 *size
+= ISIS_FIXED_HDR_LEN
;
1568 int isis_handle_pdu(struct isis_circuit
*circuit
, uint8_t *ssnpa
)
1570 int retval
= ISIS_OK
;
1571 size_t pdu_start
= stream_get_getp(circuit
->rcv_stream
);
1572 size_t pdu_end
= stream_get_endp(circuit
->rcv_stream
);
1573 char raw_pdu
[pdu_end
- pdu_start
];
1575 stream_get_from(raw_pdu
, circuit
->rcv_stream
, pdu_start
,
1576 pdu_end
- pdu_start
);
1578 /* Verify that at least the 8 bytes fixed header have been received */
1579 if (stream_get_endp(circuit
->rcv_stream
) < ISIS_FIXED_HDR_LEN
) {
1580 flog_err(EC_ISIS_PACKET
, "PDU is too short to be IS-IS.");
1584 uint8_t idrp
= stream_getc(circuit
->rcv_stream
);
1585 uint8_t length
= stream_getc(circuit
->rcv_stream
);
1586 uint8_t version1
= stream_getc(circuit
->rcv_stream
);
1587 uint8_t id_len
= stream_getc(circuit
->rcv_stream
);
1588 uint8_t pdu_type
= stream_getc(circuit
->rcv_stream
)
1589 & 0x1f; /* bits 6-8 are reserved */
1590 uint8_t version2
= stream_getc(circuit
->rcv_stream
);
1592 stream_forward_getp(circuit
->rcv_stream
, 1); /* reserved */
1593 uint8_t max_area_addrs
= stream_getc(circuit
->rcv_stream
);
1595 pdu_counter_count(circuit
->area
->pdu_rx_counters
, pdu_type
);
1597 if (idrp
== ISO9542_ESIS
) {
1598 flog_err(EC_LIB_DEVELOPMENT
,
1599 "No support for ES-IS packet IDRP=%" PRIx8
, idrp
);
1603 if (idrp
!= ISO10589_ISIS
) {
1604 flog_err(EC_ISIS_PACKET
, "Not an IS-IS packet IDRP=%" PRIx8
,
1609 if (version1
!= 1) {
1610 zlog_warn("Unsupported ISIS version %" PRIu8
, version1
);
1612 /* send northbound notification */
1613 isis_notif_version_skew(circuit
, version1
, raw_pdu
);
1614 #endif /* ifndef FABRICD */
1615 return ISIS_WARNING
;
1618 if (id_len
!= 0 && id_len
!= ISIS_SYS_ID_LEN
) {
1621 "IDFieldLengthMismatch: ID Length field in a received PDU %" PRIu8
1622 ", while the parameter for this IS is %u",
1623 id_len
, ISIS_SYS_ID_LEN
);
1625 /* send northbound notification */
1626 isis_notif_id_len_mismatch(circuit
, id_len
, raw_pdu
);
1627 #endif /* ifndef FABRICD */
1631 uint8_t expected_length
;
1632 if (pdu_size(pdu_type
, &expected_length
)) {
1633 zlog_warn("Unsupported ISIS PDU %" PRIu8
, pdu_type
);
1634 return ISIS_WARNING
;
1637 if (length
!= expected_length
) {
1638 flog_err(EC_ISIS_PACKET
,
1639 "Exepected fixed header length = %" PRIu8
1641 expected_length
, length
);
1645 if (stream_get_endp(circuit
->rcv_stream
) < length
) {
1648 "PDU is too short to contain fixed header of given PDU type.");
1652 if (version2
!= 1) {
1653 zlog_warn("Unsupported ISIS PDU version %" PRIu8
, version2
);
1655 /* send northbound notification */
1656 isis_notif_version_skew(circuit
, version2
, raw_pdu
);
1657 #endif /* ifndef FABRICD */
1658 return ISIS_WARNING
;
1661 if (circuit
->is_passive
) {
1662 zlog_warn("Received ISIS PDU on passive circuit %s",
1663 circuit
->interface
->name
);
1664 return ISIS_WARNING
;
1668 if (pdu_type
!= FS_LINK_STATE
/* FS PDU doesn't contain max area addr field */
1669 && max_area_addrs
!= 0
1670 && max_area_addrs
!= isis
->max_area_addrs
) {
1673 "maximumAreaAddressesMismatch: maximumAreaAdresses in a received PDU %" PRIu8
1674 " while the parameter for this IS is %u",
1675 max_area_addrs
, isis
->max_area_addrs
);
1677 /* send northbound notification */
1678 isis_notif_max_area_addr_mismatch(circuit
, max_area_addrs
,
1680 #endif /* ifndef FABRICD */
1688 if (fabricd
&& pdu_type
!= P2P_HELLO
)
1690 retval
= process_hello(pdu_type
, circuit
, ssnpa
);
1696 && pdu_type
!= L2_LINK_STATE
1697 && pdu_type
!= FS_LINK_STATE
)
1699 retval
= process_lsp(pdu_type
, circuit
, ssnpa
, max_area_addrs
);
1701 case L1_COMPLETE_SEQ_NUM
:
1702 case L2_COMPLETE_SEQ_NUM
:
1703 case L1_PARTIAL_SEQ_NUM
:
1704 case L2_PARTIAL_SEQ_NUM
:
1705 retval
= process_snp(pdu_type
, circuit
, ssnpa
);
1714 int isis_receive(struct thread
*thread
)
1716 struct isis_circuit
*circuit
;
1717 uint8_t ssnpa
[ETH_ALEN
];
1723 circuit
= THREAD_ARG(thread
);
1726 circuit
->t_read
= NULL
;
1728 isis_circuit_stream(circuit
, &circuit
->rcv_stream
);
1730 retval
= circuit
->rx(circuit
, ssnpa
);
1732 #if ISIS_METHOD != ISIS_METHOD_BPF
1733 if (retval
== ISIS_OK
)
1734 retval
= isis_handle_pdu(circuit
, ssnpa
);
1735 #endif //ISIS_METHOD != ISIS_METHOD_BPF
1738 * prepare for next packet.
1740 if (!circuit
->is_passive
)
1741 isis_circuit_prepare(circuit
);
1749 void fill_fixed_hdr(uint8_t pdu_type
, struct stream
*stream
)
1753 if (pdu_size(pdu_type
, &length
))
1754 assert(!"Unknown PDU Type");
1756 stream_putc(stream
, ISO10589_ISIS
); /* IDRP */
1757 stream_putc(stream
, length
); /* Length of fixed header */
1758 stream_putc(stream
, 1); /* Version/Protocol ID Extension 1 */
1759 stream_putc(stream
, 0); /* ID Length, 0 => 6 */
1760 stream_putc(stream
, pdu_type
);
1761 stream_putc(stream
, 1); /* Subversion */
1762 stream_putc(stream
, 0); /* Reserved */
1763 stream_putc(stream
, 0); /* Max Area Addresses 0 => 3 */
1766 static uint8_t hello_pdu_type(struct isis_circuit
*circuit
, int level
)
1768 if (circuit
->circ_type
== CIRCUIT_T_BROADCAST
)
1769 return (level
== IS_LEVEL_1
) ? L1_LAN_HELLO
: L2_LAN_HELLO
;
1774 static void put_hello_hdr(struct isis_circuit
*circuit
, int level
,
1775 size_t *len_pointer
)
1777 uint8_t pdu_type
= hello_pdu_type(circuit
, level
);
1779 isis_circuit_stream(circuit
, &circuit
->snd_stream
);
1780 fill_fixed_hdr(pdu_type
, circuit
->snd_stream
);
1782 stream_putc(circuit
->snd_stream
, circuit
->is_type
);
1783 stream_put(circuit
->snd_stream
, circuit
->area
->isis
->sysid
,
1786 uint32_t holdtime
= circuit
->hello_multiplier
[level
- 1]
1787 * circuit
->hello_interval
[level
- 1];
1789 if (holdtime
> 0xffff)
1792 stream_putw(circuit
->snd_stream
, holdtime
);
1793 *len_pointer
= stream_get_endp(circuit
->snd_stream
);
1794 stream_putw(circuit
->snd_stream
, 0); /* length is filled in later */
1796 if (circuit
->circ_type
== CIRCUIT_T_BROADCAST
) {
1797 uint8_t *desig_is
= (level
== IS_LEVEL_1
)
1798 ? circuit
->u
.bc
.l1_desig_is
1799 : circuit
->u
.bc
.l2_desig_is
;
1800 stream_putc(circuit
->snd_stream
, circuit
->priority
[level
- 1]);
1801 stream_put(circuit
->snd_stream
, desig_is
, ISIS_SYS_ID_LEN
+ 1);
1803 stream_putc(circuit
->snd_stream
, circuit
->circuit_id
);
1807 int send_hello(struct isis_circuit
*circuit
, int level
)
1812 if (circuit
->is_passive
)
1815 if (circuit
->interface
->mtu
== 0) {
1816 zlog_warn("circuit has zero MTU");
1817 return ISIS_WARNING
;
1820 put_hello_hdr(circuit
, level
, &len_pointer
);
1822 struct isis_tlvs
*tlvs
= isis_alloc_tlvs();
1824 isis_tlvs_add_auth(tlvs
, &circuit
->passwd
);
1826 if (!listcount(circuit
->area
->area_addrs
)) {
1827 isis_free_tlvs(tlvs
);
1828 return ISIS_WARNING
;
1831 isis_tlvs_add_area_addresses(tlvs
, circuit
->area
->area_addrs
);
1833 if (circuit
->circ_type
== CIRCUIT_T_BROADCAST
) {
1834 isis_tlvs_add_lan_neighbors(
1835 tlvs
, circuit
->u
.bc
.lan_neighs
[level
- 1]);
1836 } else if (circuit
->circ_type
== CIRCUIT_T_P2P
1837 && !circuit
->disable_threeway_adj
) {
1838 uint32_t ext_circuit_id
= circuit
->idx
;
1839 if (circuit
->u
.p2p
.neighbor
) {
1840 uint8_t threeway_state
;
1842 if (fabricd_initial_sync_is_in_progress(circuit
->area
)
1843 && fabricd_initial_sync_circuit(circuit
->area
) != circuit
)
1844 threeway_state
= ISIS_THREEWAY_DOWN
;
1846 threeway_state
= circuit
->u
.p2p
.neighbor
->threeway_state
;
1847 isis_tlvs_add_threeway_adj(tlvs
,
1850 circuit
->u
.p2p
.neighbor
->sysid
,
1851 circuit
->u
.p2p
.neighbor
->ext_circuit_id
);
1853 isis_tlvs_add_threeway_adj(tlvs
,
1860 isis_tlvs_set_protocols_supported(tlvs
, &circuit
->nlpids
);
1865 * TLV gets included if no topology is enabled on the interface,
1866 * if one topology other than #0 is enabled, or if multiple topologies
1869 struct isis_circuit_mt_setting
**mt_settings
;
1870 unsigned int mt_count
;
1872 mt_settings
= circuit_mt_settings(circuit
, &mt_count
);
1873 if (mt_count
== 0 && area_is_mt(circuit
->area
)) {
1874 tlvs
->mt_router_info_empty
= true;
1875 } else if ((mt_count
== 1
1876 && mt_settings
[0]->mtid
!= ISIS_MT_IPV4_UNICAST
)
1877 || (mt_count
> 1)) {
1878 for (unsigned int i
= 0; i
< mt_count
; i
++)
1879 isis_tlvs_add_mt_router_info(tlvs
, mt_settings
[i
]->mtid
,
1883 if (circuit
->ip_router
) {
1884 struct list
*circuit_ip_addrs
= fabricd_ip_addrs(circuit
);
1886 if (circuit_ip_addrs
)
1887 isis_tlvs_add_ipv4_addresses(tlvs
, circuit_ip_addrs
);
1890 if (circuit
->ipv6_router
&& circuit
->ipv6_link
)
1891 isis_tlvs_add_ipv6_addresses(tlvs
, circuit
->ipv6_link
);
1893 if (isis_pack_tlvs(tlvs
, circuit
->snd_stream
, len_pointer
,
1894 circuit
->pad_hellos
, false)) {
1895 isis_free_tlvs(tlvs
);
1896 return ISIS_WARNING
; /* XXX: Maybe Log TLV structure? */
1899 if (isis
->debugs
& DEBUG_ADJ_PACKETS
) {
1900 if (circuit
->circ_type
== CIRCUIT_T_BROADCAST
) {
1902 "ISIS-Adj (%s): Sending L%d LAN IIH on %s, length %zd",
1903 circuit
->area
->area_tag
, level
,
1904 circuit
->interface
->name
,
1905 stream_get_endp(circuit
->snd_stream
));
1908 "ISIS-Adj (%s): Sending P2P IIH on %s, length %zd",
1909 circuit
->area
->area_tag
,
1910 circuit
->interface
->name
,
1911 stream_get_endp(circuit
->snd_stream
));
1913 if (isis
->debugs
& DEBUG_PACKET_DUMP
)
1914 zlog_dump_data(STREAM_DATA(circuit
->snd_stream
),
1915 stream_get_endp(circuit
->snd_stream
));
1918 isis_free_tlvs(tlvs
);
1920 pdu_counter_count(circuit
->area
->pdu_tx_counters
,
1921 hello_pdu_type(circuit
, level
));
1922 retval
= circuit
->tx(circuit
, level
);
1923 if (retval
!= ISIS_OK
)
1924 flog_err(EC_ISIS_PACKET
,
1925 "ISIS-Adj (%s): Send L%d IIH on %s failed",
1926 circuit
->area
->area_tag
, level
,
1927 circuit
->interface
->name
);
1932 static int send_hello_cb(struct thread
*thread
)
1934 struct isis_circuit_arg
*arg
= THREAD_ARG(thread
);
1937 struct isis_circuit
*circuit
= arg
->circuit
;
1938 int level
= arg
->level
;
1942 if (circuit
->circ_type
== CIRCUIT_T_P2P
) {
1943 circuit
->u
.p2p
.t_send_p2p_hello
= NULL
;
1944 send_hello(circuit
, 1);
1945 send_hello_sched(circuit
, ISIS_LEVEL1
,
1946 1000 * circuit
->hello_interval
[1]);
1950 if (circuit
->circ_type
!= CIRCUIT_T_BROADCAST
) {
1951 zlog_warn("ISIS-Hello (%s): Trying to send hello on unknown circuit type %d",
1952 circuit
->area
->area_tag
, circuit
->circ_type
);
1953 return ISIS_WARNING
;
1956 circuit
->u
.bc
.t_send_lan_hello
[level
- 1] = NULL
;
1957 if (!(circuit
->is_type
& level
)) {
1958 zlog_warn("ISIS-Hello (%s): Trying to send L%d IIH in L%d-only circuit",
1959 circuit
->area
->area_tag
, level
, 3 - level
);
1960 return ISIS_WARNING
;
1963 if (circuit
->u
.bc
.run_dr_elect
[level
- 1])
1964 isis_dr_elect(circuit
, level
);
1966 int rv
= send_hello(circuit
, level
);
1968 /* set next timer thread */
1969 send_hello_sched(circuit
, level
, 1000 * circuit
->hello_interval
[level
- 1]);
1973 static void _send_hello_sched(struct isis_circuit
*circuit
,
1974 struct thread
**threadp
,
1975 int level
, long delay
)
1978 if (thread_timer_remain_msec(*threadp
) < (unsigned long)delay
)
1981 thread_cancel(*threadp
);
1984 thread_add_timer_msec(master
, send_hello_cb
,
1985 &circuit
->level_arg
[level
- 1],
1986 isis_jitter(delay
, IIH_JITTER
),
1990 void send_hello_sched(struct isis_circuit
*circuit
, int level
, long delay
)
1992 if (circuit
->circ_type
== CIRCUIT_T_P2P
) {
1993 _send_hello_sched(circuit
, &circuit
->u
.p2p
.t_send_p2p_hello
,
1994 ISIS_LEVEL1
, delay
);
1998 if (circuit
->circ_type
!= CIRCUIT_T_BROADCAST
) {
1999 zlog_warn("%s: encountered unknown circuit type %d on %s",
2000 __func__
, circuit
->circ_type
,
2001 circuit
->interface
->name
);
2005 for (int loop_level
= ISIS_LEVEL1
; loop_level
<= ISIS_LEVEL2
; loop_level
++) {
2006 if (!(loop_level
& level
))
2011 &circuit
->u
.bc
.t_send_lan_hello
[loop_level
- 1],
2020 * Count the maximum number of lsps that can be accomodated by a given size.
2022 #define LSP_ENTRIES_LEN (10 + ISIS_SYS_ID_LEN)
2023 static uint16_t get_max_lsp_count(uint16_t size
)
2027 uint16_t remaining_size
;
2029 /* First count the full size TLVs */
2030 tlv_count
= size
/ MAX_LSP_ENTRIES_TLV_SIZE
;
2031 lsp_count
= tlv_count
* (MAX_LSP_ENTRIES_TLV_SIZE
/ LSP_ENTRIES_LEN
);
2033 /* The last TLV, if any */
2034 remaining_size
= size
% MAX_LSP_ENTRIES_TLV_SIZE
;
2035 if (remaining_size
- 2 >= LSP_ENTRIES_LEN
)
2036 lsp_count
+= (remaining_size
- 2) / LSP_ENTRIES_LEN
;
2041 int send_csnp(struct isis_circuit
*circuit
, int level
)
2043 if (circuit
->area
->lspdb
[level
- 1] == NULL
2044 || dict_count(circuit
->area
->lspdb
[level
- 1]) == 0)
2047 uint8_t pdu_type
= (level
== ISIS_LEVEL1
) ? L1_COMPLETE_SEQ_NUM
2048 : L2_COMPLETE_SEQ_NUM
;
2050 isis_circuit_stream(circuit
, &circuit
->snd_stream
);
2051 fill_fixed_hdr(pdu_type
, circuit
->snd_stream
);
2053 size_t len_pointer
= stream_get_endp(circuit
->snd_stream
);
2054 stream_putw(circuit
->snd_stream
, 0);
2055 stream_put(circuit
->snd_stream
, isis
->sysid
, ISIS_SYS_ID_LEN
);
2056 /* with zero circuit id - ref 9.10, 9.11 */
2057 stream_putc(circuit
->snd_stream
, 0);
2059 size_t start_pointer
= stream_get_endp(circuit
->snd_stream
);
2060 stream_put(circuit
->snd_stream
, 0, ISIS_SYS_ID_LEN
+ 2);
2061 size_t end_pointer
= stream_get_endp(circuit
->snd_stream
);
2062 stream_put(circuit
->snd_stream
, 0, ISIS_SYS_ID_LEN
+ 2);
2064 struct isis_passwd
*passwd
= (level
== ISIS_LEVEL1
)
2065 ? &circuit
->area
->area_passwd
2066 : &circuit
->area
->domain_passwd
;
2068 struct isis_tlvs
*tlvs
= isis_alloc_tlvs();
2070 if (CHECK_FLAG(passwd
->snp_auth
, SNP_AUTH_SEND
))
2071 isis_tlvs_add_auth(tlvs
, passwd
);
2073 size_t tlv_start
= stream_get_endp(circuit
->snd_stream
);
2074 if (isis_pack_tlvs(tlvs
, circuit
->snd_stream
, len_pointer
, false,
2076 isis_free_tlvs(tlvs
);
2077 return ISIS_WARNING
;
2079 isis_free_tlvs(tlvs
);
2082 get_max_lsp_count(STREAM_WRITEABLE(circuit
->snd_stream
));
2084 uint8_t start
[ISIS_SYS_ID_LEN
+ 2];
2085 memset(start
, 0x00, ISIS_SYS_ID_LEN
+ 2);
2086 uint8_t stop
[ISIS_SYS_ID_LEN
+ 2];
2087 memset(stop
, 0xff, ISIS_SYS_ID_LEN
+ 2);
2091 tlvs
= isis_alloc_tlvs();
2092 if (CHECK_FLAG(passwd
->snp_auth
, SNP_AUTH_SEND
))
2093 isis_tlvs_add_auth(tlvs
, passwd
);
2095 struct isis_lsp
*last_lsp
;
2096 isis_tlvs_add_csnp_entries(tlvs
, start
, stop
, num_lsps
,
2097 circuit
->area
->lspdb
[level
- 1],
2100 * Update the stop lsp_id before encoding this CSNP.
2102 if (tlvs
->lsp_entries
.count
< num_lsps
) {
2103 memset(stop
, 0xff, ISIS_SYS_ID_LEN
+ 2);
2105 memcpy(stop
, last_lsp
->hdr
.lsp_id
, sizeof(stop
));
2108 memcpy(STREAM_DATA(circuit
->snd_stream
) + start_pointer
, start
,
2109 ISIS_SYS_ID_LEN
+ 2);
2110 memcpy(STREAM_DATA(circuit
->snd_stream
) + end_pointer
, stop
,
2111 ISIS_SYS_ID_LEN
+ 2);
2112 stream_set_endp(circuit
->snd_stream
, tlv_start
);
2113 if (isis_pack_tlvs(tlvs
, circuit
->snd_stream
, len_pointer
,
2115 isis_free_tlvs(tlvs
);
2116 return ISIS_WARNING
;
2119 if (isis
->debugs
& DEBUG_SNP_PACKETS
) {
2121 "ISIS-Snp (%s): Sending L%d CSNP on %s, length %zd",
2122 circuit
->area
->area_tag
, level
,
2123 circuit
->interface
->name
,
2124 stream_get_endp(circuit
->snd_stream
));
2125 log_multiline(LOG_DEBUG
, " ", "%s",
2126 isis_format_tlvs(tlvs
));
2127 if (isis
->debugs
& DEBUG_PACKET_DUMP
)
2129 STREAM_DATA(circuit
->snd_stream
),
2130 stream_get_endp(circuit
->snd_stream
));
2133 pdu_counter_count(circuit
->area
->pdu_tx_counters
, pdu_type
);
2134 int retval
= circuit
->tx(circuit
, level
);
2135 if (retval
!= ISIS_OK
) {
2136 flog_err(EC_ISIS_PACKET
,
2137 "ISIS-Snp (%s): Send L%d CSNP on %s failed",
2138 circuit
->area
->area_tag
, level
,
2139 circuit
->interface
->name
);
2140 isis_free_tlvs(tlvs
);
2145 * Start lsp_id of the next CSNP should be one plus the
2146 * stop lsp_id in this current CSNP.
2148 memcpy(start
, stop
, ISIS_SYS_ID_LEN
+ 2);
2150 for (int i
= ISIS_SYS_ID_LEN
+ 1; i
>= 0; --i
) {
2151 if (start
[i
] < (uint8_t)0xff) {
2157 memset(stop
, 0xff, ISIS_SYS_ID_LEN
+ 2);
2158 isis_free_tlvs(tlvs
);
2164 int send_l1_csnp(struct thread
*thread
)
2166 struct isis_circuit
*circuit
;
2168 circuit
= THREAD_ARG(thread
);
2171 circuit
->t_send_csnp
[0] = NULL
;
2173 if ((circuit
->circ_type
== CIRCUIT_T_BROADCAST
2174 && circuit
->u
.bc
.is_dr
[0])
2175 || circuit
->circ_type
== CIRCUIT_T_P2P
) {
2176 send_csnp(circuit
, 1);
2178 /* set next timer thread */
2179 thread_add_timer(master
, send_l1_csnp
, circuit
,
2180 isis_jitter(circuit
->csnp_interval
[0], CSNP_JITTER
),
2181 &circuit
->t_send_csnp
[0]);
2186 int send_l2_csnp(struct thread
*thread
)
2188 struct isis_circuit
*circuit
;
2190 circuit
= THREAD_ARG(thread
);
2193 circuit
->t_send_csnp
[1] = NULL
;
2195 if ((circuit
->circ_type
== CIRCUIT_T_BROADCAST
2196 && circuit
->u
.bc
.is_dr
[1])
2197 || circuit
->circ_type
== CIRCUIT_T_P2P
) {
2198 send_csnp(circuit
, 2);
2200 /* set next timer thread */
2201 thread_add_timer(master
, send_l2_csnp
, circuit
,
2202 isis_jitter(circuit
->csnp_interval
[1], CSNP_JITTER
),
2203 &circuit
->t_send_csnp
[1]);
2209 * 7.3.15.4 action on expiration of partial SNP interval
2212 static int send_psnp(int level
, struct isis_circuit
*circuit
)
2214 if (circuit
->circ_type
== CIRCUIT_T_BROADCAST
2215 && circuit
->u
.bc
.is_dr
[level
- 1])
2218 if (circuit
->area
->lspdb
[level
- 1] == NULL
2219 || dict_count(circuit
->area
->lspdb
[level
- 1]) == 0)
2222 if (!circuit
->snd_stream
)
2225 uint8_t pdu_type
= (level
== ISIS_LEVEL1
) ? L1_PARTIAL_SEQ_NUM
2226 : L2_PARTIAL_SEQ_NUM
;
2228 isis_circuit_stream(circuit
, &circuit
->snd_stream
);
2229 fill_fixed_hdr(pdu_type
, circuit
->snd_stream
);
2231 size_t len_pointer
= stream_get_endp(circuit
->snd_stream
);
2232 stream_putw(circuit
->snd_stream
, 0); /* length is filled in later */
2233 stream_put(circuit
->snd_stream
, isis
->sysid
, ISIS_SYS_ID_LEN
);
2234 stream_putc(circuit
->snd_stream
, circuit
->idx
);
2236 struct isis_passwd
*passwd
= (level
== ISIS_LEVEL1
)
2237 ? &circuit
->area
->area_passwd
2238 : &circuit
->area
->domain_passwd
;
2240 struct isis_tlvs
*tlvs
= isis_alloc_tlvs();
2242 if (CHECK_FLAG(passwd
->snp_auth
, SNP_AUTH_SEND
))
2243 isis_tlvs_add_auth(tlvs
, passwd
);
2245 size_t tlv_start
= stream_get_endp(circuit
->snd_stream
);
2246 if (isis_pack_tlvs(tlvs
, circuit
->snd_stream
, len_pointer
, false,
2248 isis_free_tlvs(tlvs
);
2249 return ISIS_WARNING
;
2251 isis_free_tlvs(tlvs
);
2254 get_max_lsp_count(STREAM_WRITEABLE(circuit
->snd_stream
));
2257 tlvs
= isis_alloc_tlvs();
2258 if (CHECK_FLAG(passwd
->snp_auth
, SNP_AUTH_SEND
))
2259 isis_tlvs_add_auth(tlvs
, passwd
);
2261 for (dnode_t
*dnode
=
2262 dict_first(circuit
->area
->lspdb
[level
- 1]);
2263 dnode
; dnode
= dict_next(circuit
->area
->lspdb
[level
- 1],
2265 struct isis_lsp
*lsp
= dnode_get(dnode
);
2267 if (ISIS_CHECK_FLAG(lsp
->SSNflags
, circuit
))
2268 isis_tlvs_add_lsp_entry(tlvs
, lsp
);
2270 if (tlvs
->lsp_entries
.count
== num_lsps
)
2274 if (!tlvs
->lsp_entries
.count
) {
2275 isis_free_tlvs(tlvs
);
2279 stream_set_endp(circuit
->snd_stream
, tlv_start
);
2280 if (isis_pack_tlvs(tlvs
, circuit
->snd_stream
, len_pointer
,
2282 isis_free_tlvs(tlvs
);
2283 return ISIS_WARNING
;
2286 if (isis
->debugs
& DEBUG_SNP_PACKETS
) {
2288 "ISIS-Snp (%s): Sending L%d PSNP on %s, length %zd",
2289 circuit
->area
->area_tag
, level
,
2290 circuit
->interface
->name
,
2291 stream_get_endp(circuit
->snd_stream
));
2292 log_multiline(LOG_DEBUG
, " ", "%s",
2293 isis_format_tlvs(tlvs
));
2294 if (isis
->debugs
& DEBUG_PACKET_DUMP
)
2296 STREAM_DATA(circuit
->snd_stream
),
2297 stream_get_endp(circuit
->snd_stream
));
2300 pdu_counter_count(circuit
->area
->pdu_tx_counters
, pdu_type
);
2301 int retval
= circuit
->tx(circuit
, level
);
2302 if (retval
!= ISIS_OK
) {
2303 flog_err(EC_ISIS_PACKET
,
2304 "ISIS-Snp (%s): Send L%d PSNP on %s failed",
2305 circuit
->area
->area_tag
, level
,
2306 circuit
->interface
->name
);
2307 isis_free_tlvs(tlvs
);
2312 * sending succeeded, we can clear SSN flags of this circuit
2313 * for the LSPs in list
2315 struct isis_lsp_entry
*entry_head
;
2316 entry_head
= (struct isis_lsp_entry
*)tlvs
->lsp_entries
.head
;
2317 for (struct isis_lsp_entry
*entry
= entry_head
; entry
;
2318 entry
= entry
->next
)
2319 ISIS_CLEAR_FLAG(entry
->lsp
->SSNflags
, circuit
);
2320 isis_free_tlvs(tlvs
);
2326 int send_l1_psnp(struct thread
*thread
)
2329 struct isis_circuit
*circuit
;
2331 circuit
= THREAD_ARG(thread
);
2334 circuit
->t_send_psnp
[0] = NULL
;
2336 send_psnp(1, circuit
);
2337 /* set next timer thread */
2338 thread_add_timer(master
, send_l1_psnp
, circuit
,
2339 isis_jitter(circuit
->psnp_interval
[0], PSNP_JITTER
),
2340 &circuit
->t_send_psnp
[0]);
2346 * 7.3.15.4 action on expiration of partial SNP interval
2349 int send_l2_psnp(struct thread
*thread
)
2351 struct isis_circuit
*circuit
;
2353 circuit
= THREAD_ARG(thread
);
2356 circuit
->t_send_psnp
[1] = NULL
;
2358 send_psnp(2, circuit
);
2360 /* set next timer thread */
2361 thread_add_timer(master
, send_l2_psnp
, circuit
,
2362 isis_jitter(circuit
->psnp_interval
[1], PSNP_JITTER
),
2363 &circuit
->t_send_psnp
[1]);
2369 * ISO 10589 - 7.3.14.3
2371 void send_lsp(struct isis_circuit
*circuit
, struct isis_lsp
*lsp
,
2372 enum isis_tx_type tx_type
)
2375 int retval
= ISIS_OK
;
2377 if (circuit
->state
!= C_STATE_UP
|| circuit
->is_passive
== 1)
2381 * Do not send if levels do not match
2383 if (!(lsp
->level
& circuit
->is_type
))
2387 * Do not send if we do not have adjacencies in state up on the circuit
2389 if (circuit
->upadjcount
[lsp
->level
- 1] == 0)
2392 /* stream_copy will assert and stop program execution if LSP is larger
2394 * the circuit's MTU. So handle and log this case here. */
2395 if (stream_get_endp(lsp
->pdu
) > stream_get_size(circuit
->snd_stream
)) {
2398 "ISIS-Upd (%s): Can't send L%d LSP %s, seq 0x%08" PRIx32
2399 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16
2400 "s on %s. LSP Size is %zu while interface stream size is %zu.",
2401 circuit
->area
->area_tag
, lsp
->level
,
2402 rawlspid_print(lsp
->hdr
.lsp_id
), lsp
->hdr
.seqno
,
2403 lsp
->hdr
.checksum
, lsp
->hdr
.rem_lifetime
,
2404 circuit
->interface
->name
, stream_get_endp(lsp
->pdu
),
2405 stream_get_size(circuit
->snd_stream
));
2407 /* send a northbound notification */
2408 isis_notif_lsp_too_large(circuit
, stream_get_endp(lsp
->pdu
),
2409 rawlspid_print(lsp
->hdr
.lsp_id
));
2410 #endif /* ifndef FABRICD */
2411 if (isis
->debugs
& DEBUG_PACKET_DUMP
)
2412 zlog_dump_data(STREAM_DATA(lsp
->pdu
),
2413 stream_get_endp(lsp
->pdu
));
2414 retval
= ISIS_ERROR
;
2418 /* copy our lsp to the send buffer */
2419 stream_copy(circuit
->snd_stream
, lsp
->pdu
);
2421 if (tx_type
== TX_LSP_CIRCUIT_SCOPED
) {
2422 stream_putc_at(circuit
->snd_stream
, 4, FS_LINK_STATE
);
2423 stream_putc_at(circuit
->snd_stream
, 7,
2424 L2_CIRCUIT_FLOODING_SCOPE
);
2427 if (isis
->debugs
& DEBUG_UPDATE_PACKETS
) {
2428 zlog_debug("ISIS-Upd (%s): Sending %sL%d LSP %s, seq 0x%08" PRIx32
2429 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16
2431 circuit
->area
->area_tag
,
2432 (tx_type
== TX_LSP_CIRCUIT_SCOPED
)
2433 ? "Circuit scoped " : "",
2435 rawlspid_print(lsp
->hdr
.lsp_id
), lsp
->hdr
.seqno
,
2436 lsp
->hdr
.checksum
, lsp
->hdr
.rem_lifetime
,
2437 circuit
->interface
->name
);
2438 if (isis
->debugs
& DEBUG_PACKET_DUMP
)
2439 zlog_dump_data(STREAM_DATA(circuit
->snd_stream
),
2440 stream_get_endp(circuit
->snd_stream
));
2443 uint8_t pdu_type
= (tx_type
== TX_LSP_CIRCUIT_SCOPED
) ? FS_LINK_STATE
2444 : (lsp
->level
== ISIS_LEVEL1
) ? L1_LINK_STATE
2448 pdu_counter_count(circuit
->area
->pdu_tx_counters
, pdu_type
);
2449 retval
= circuit
->tx(circuit
, lsp
->level
);
2450 if (retval
!= ISIS_OK
) {
2451 flog_err(EC_ISIS_PACKET
,
2452 "ISIS-Upd (%s): Send L%d LSP on %s failed %s",
2453 circuit
->area
->area_tag
, lsp
->level
,
2454 circuit
->interface
->name
,
2455 (retval
== ISIS_WARNING
) ? "temporarily"
2461 || (retval
== ISIS_OK
&& circuit
->circ_type
== CIRCUIT_T_BROADCAST
)
2462 || (retval
!= ISIS_OK
&& retval
!= ISIS_WARNING
)) {
2463 /* SRM flag will trigger retransmission. We will not retransmit
2465 * encountered a fatal error.
2466 * On success, they should only be cleared if it's a broadcast
2468 * On a P2P circuit, we will wait for the ack from the neighbor
2472 isis_tx_queue_del(circuit
->tx_queue
, lsp
);