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git.proxmox.com Git - mirror_frr.git/blob - isisd/isis_lsp.c
2 * IS-IS Rout(e)ing protocol - isis_lsp.c
5 * Copyright (C) 2001,2002 Sampo Saaristo
6 * Tampere University of Technology
7 * Institute of Communications Engineering
8 * Copyright (C) 2013-2015 Christian Franke <chris@opensourcerouting.org>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
15 * This program is distributed in the hope that it will be useful,but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
20 * You should have received a copy of the GNU General Public License along
21 * with this program; see the file COPYING; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
41 #include "isisd/dict.h"
42 #include "isisd/isis_constants.h"
43 #include "isisd/isis_common.h"
44 #include "isisd/isis_flags.h"
45 #include "isisd/isis_circuit.h"
46 #include "isisd/isisd.h"
47 #include "isisd/isis_lsp.h"
48 #include "isisd/isis_pdu.h"
49 #include "isisd/isis_dynhn.h"
50 #include "isisd/isis_misc.h"
51 #include "isisd/isis_csm.h"
52 #include "isisd/isis_adjacency.h"
53 #include "isisd/isis_spf.h"
54 #include "isisd/isis_te.h"
55 #include "isisd/isis_mt.h"
56 #include "isisd/isis_tlvs.h"
58 /* staticly assigned vars for printing purposes */
59 char lsp_bits_string
[200]; /* FIXME: enough ? */
61 static int lsp_l1_refresh(struct thread
*thread
);
62 static int lsp_l2_refresh(struct thread
*thread
);
63 static int lsp_l1_refresh_pseudo(struct thread
*thread
);
64 static int lsp_l2_refresh_pseudo(struct thread
*thread
);
66 int lsp_id_cmp(u_char
*id1
, u_char
*id2
)
68 return memcmp(id1
, id2
, ISIS_SYS_ID_LEN
+ 2);
71 dict_t
*lsp_db_init(void)
75 dict
= dict_create(DICTCOUNT_T_MAX
, (dict_comp_t
)lsp_id_cmp
);
80 struct isis_lsp
*lsp_search(u_char
*id
, dict_t
*lspdb
)
87 zlog_debug("searching db");
88 for (dn
= dict_first(lspdb
); dn
; dn
= dict_next(lspdb
, dn
)) {
90 rawlspid_print((u_char
*)dnode_getkey(dn
)),
93 #endif /* EXTREME DEBUG */
95 node
= dict_lookup(lspdb
, id
);
98 return (struct isis_lsp
*)dnode_get(node
);
103 static void lsp_clear_data(struct isis_lsp
*lsp
)
108 isis_free_tlvs(lsp
->tlvs
);
112 static void lsp_destroy(struct isis_lsp
*lsp
)
114 struct listnode
*cnode
;
115 struct isis_circuit
*circuit
;
120 for (ALL_LIST_ELEMENTS_RO(lsp
->area
->circuit_list
, cnode
, circuit
))
121 isis_circuit_cancel_queued_lsp(circuit
, lsp
);
123 ISIS_FLAGS_CLEAR_ALL(lsp
->SSNflags
);
124 ISIS_FLAGS_CLEAR_ALL(lsp
->SRMflags
);
128 if (LSP_FRAGMENT(lsp
->hdr
.lsp_id
) == 0 && lsp
->lspu
.frags
) {
129 list_delete_and_null(&lsp
->lspu
.frags
);
130 lsp
->lspu
.frags
= NULL
;
133 isis_spf_schedule(lsp
->area
, lsp
->level
);
136 stream_free(lsp
->pdu
);
137 XFREE(MTYPE_ISIS_LSP
, lsp
);
140 void lsp_db_destroy(dict_t
*lspdb
)
142 dnode_t
*dnode
, *next
;
143 struct isis_lsp
*lsp
;
145 dnode
= dict_first(lspdb
);
147 next
= dict_next(lspdb
, dnode
);
148 lsp
= dnode_get(dnode
);
150 dict_delete_free(lspdb
, dnode
);
160 * Remove all the frags belonging to the given lsp
162 static void lsp_remove_frags(struct list
*frags
, dict_t
*lspdb
)
165 struct listnode
*lnode
, *lnnode
;
166 struct isis_lsp
*lsp
;
168 for (ALL_LIST_ELEMENTS(frags
, lnode
, lnnode
, lsp
)) {
169 dnode
= dict_lookup(lspdb
, lsp
->hdr
.lsp_id
);
171 dnode_destroy(dict_delete(lspdb
, dnode
));
174 list_delete_all_node(frags
);
179 void lsp_search_and_destroy(u_char
*id
, dict_t
*lspdb
)
182 struct isis_lsp
*lsp
;
184 node
= dict_lookup(lspdb
, id
);
186 node
= dict_delete(lspdb
, node
);
187 lsp
= dnode_get(node
);
189 * If this is a zero lsp, remove all the frags now
191 if (LSP_FRAGMENT(lsp
->hdr
.lsp_id
) == 0) {
193 lsp_remove_frags(lsp
->lspu
.frags
, lspdb
);
196 * else just remove this frag, from the zero lsps' frag
199 if (lsp
->lspu
.zero_lsp
200 && lsp
->lspu
.zero_lsp
->lspu
.frags
)
201 listnode_delete(lsp
->lspu
.zero_lsp
->lspu
.frags
,
210 * Compares a LSP to given values
211 * Params are given in net order
213 int lsp_compare(char *areatag
, struct isis_lsp
*lsp
, uint32_t seqno
,
214 uint16_t checksum
, uint16_t rem_lifetime
)
216 if (lsp
->hdr
.seqno
== seqno
&& lsp
->hdr
.checksum
== checksum
217 && ((lsp
->hdr
.rem_lifetime
== 0 && rem_lifetime
== 0)
218 || (lsp
->hdr
.rem_lifetime
!= 0 && rem_lifetime
!= 0))) {
219 if (isis
->debugs
& DEBUG_SNP_PACKETS
) {
221 "ISIS-Snp (%s): Compare LSP %s seq 0x%08" PRIx32
222 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16
224 areatag
, rawlspid_print(lsp
->hdr
.lsp_id
),
225 lsp
->hdr
.seqno
, lsp
->hdr
.checksum
,
226 lsp
->hdr
.rem_lifetime
);
228 "ISIS-Snp (%s): is equal to ours seq 0x%08" PRIx32
229 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16
231 areatag
, seqno
, checksum
, rem_lifetime
);
237 * LSPs with identical checksums should only be treated as newer if:
238 * a) The current LSP has a remaining lifetime != 0 and the other LSP
240 * remaining lifetime == 0. In this case, we should participate in
242 * and should not treat the current LSP with remaining lifetime == 0
244 * b) The LSP has an incorrect checksum. In this case, we need to react
248 if (seqno
> lsp
->hdr
.seqno
249 || (seqno
== lsp
->hdr
.seqno
250 && ((lsp
->hdr
.rem_lifetime
!= 0 && rem_lifetime
== 0)
251 || lsp
->hdr
.checksum
!= checksum
))) {
252 if (isis
->debugs
& DEBUG_SNP_PACKETS
) {
254 "ISIS-Snp (%s): Compare LSP %s seq 0x%08" PRIx32
255 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16
257 areatag
, rawlspid_print(lsp
->hdr
.lsp_id
), seqno
,
258 checksum
, rem_lifetime
);
260 "ISIS-Snp (%s): is newer than ours seq 0x%08" PRIx32
261 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16
263 areatag
, lsp
->hdr
.seqno
, lsp
->hdr
.checksum
,
264 lsp
->hdr
.rem_lifetime
);
268 if (isis
->debugs
& DEBUG_SNP_PACKETS
) {
269 zlog_debug("ISIS-Snp (%s): Compare LSP %s seq 0x%08" PRIx32
270 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16
"s",
271 areatag
, rawlspid_print(lsp
->hdr
.lsp_id
), seqno
,
272 checksum
, rem_lifetime
);
274 "ISIS-Snp (%s): is older than ours seq 0x%08" PRIx32
275 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16
"s",
276 areatag
, lsp
->hdr
.seqno
, lsp
->hdr
.checksum
,
277 lsp
->hdr
.rem_lifetime
);
283 static void put_lsp_hdr(struct isis_lsp
*lsp
, size_t *len_pointer
, bool keep
)
286 (lsp
->level
== IS_LEVEL_1
) ? L1_LINK_STATE
: L2_LINK_STATE
;
287 struct isis_lsp_hdr
*hdr
= &lsp
->hdr
;
288 struct stream
*stream
= lsp
->pdu
;
289 size_t orig_getp
, orig_endp
;
292 orig_getp
= stream_get_getp(lsp
->pdu
);
293 orig_endp
= stream_get_endp(lsp
->pdu
);
296 stream_set_getp(lsp
->pdu
, 0);
297 stream_set_endp(lsp
->pdu
, 0);
299 fill_fixed_hdr(pdu_type
, stream
);
302 *len_pointer
= stream_get_endp(stream
);
303 stream_putw(stream
, hdr
->pdu_len
);
304 stream_putw(stream
, hdr
->rem_lifetime
);
305 stream_put(stream
, hdr
->lsp_id
, sizeof(hdr
->lsp_id
));
306 stream_putl(stream
, hdr
->seqno
);
307 stream_putw(stream
, hdr
->checksum
);
308 stream_putc(stream
, hdr
->lsp_bits
);
311 stream_set_endp(lsp
->pdu
, orig_endp
);
312 stream_set_getp(lsp
->pdu
, orig_getp
);
316 static void lsp_add_auth(struct isis_lsp
*lsp
)
318 struct isis_passwd
*passwd
;
319 passwd
= (lsp
->level
== IS_LEVEL_1
) ? &lsp
->area
->area_passwd
320 : &lsp
->area
->domain_passwd
;
321 isis_tlvs_add_auth(lsp
->tlvs
, passwd
);
324 static void lsp_pack_pdu(struct isis_lsp
*lsp
)
327 lsp
->tlvs
= isis_alloc_tlvs();
332 put_lsp_hdr(lsp
, &len_pointer
, false);
333 isis_pack_tlvs(lsp
->tlvs
, lsp
->pdu
, len_pointer
, false, true);
335 lsp
->hdr
.pdu_len
= stream_get_endp(lsp
->pdu
);
337 ntohs(fletcher_checksum(STREAM_DATA(lsp
->pdu
) + 12,
338 stream_get_endp(lsp
->pdu
) - 12, 12));
341 void lsp_inc_seqno(struct isis_lsp
*lsp
, uint32_t seqno
)
345 if (seqno
== 0 || lsp
->hdr
.seqno
> seqno
)
346 newseq
= lsp
->hdr
.seqno
+ 1;
350 lsp
->hdr
.seqno
= newseq
;
353 isis_spf_schedule(lsp
->area
, lsp
->level
);
356 static void lsp_purge(struct isis_lsp
*lsp
, int level
)
360 stream_reset(lsp
->pdu
);
363 lsp
->hdr
.checksum
= 0;
364 lsp
->hdr
.rem_lifetime
= 0;
366 lsp
->age_out
= lsp
->area
->max_lsp_lifetime
[level
- 1];
369 lsp_set_all_srmflags(lsp
);
373 * Generates checksum for LSP and its frags
375 static void lsp_seqno_update(struct isis_lsp
*lsp0
)
377 struct isis_lsp
*lsp
;
378 struct listnode
*node
;
380 lsp_inc_seqno(lsp0
, 0);
382 if (!lsp0
->lspu
.frags
)
385 for (ALL_LIST_ELEMENTS_RO(lsp0
->lspu
.frags
, node
, lsp
)) {
387 lsp_inc_seqno(lsp
, 0);
389 lsp_purge(lsp
, lsp0
->level
);
395 static u_int8_t
lsp_bits_generate(int level
, int overload_bit
, int attached_bit
)
397 u_int8_t lsp_bits
= 0;
398 if (level
== IS_LEVEL_1
)
399 lsp_bits
= IS_LEVEL_1
;
401 lsp_bits
= IS_LEVEL_1_AND_2
;
403 lsp_bits
|= overload_bit
;
405 lsp_bits
|= attached_bit
;
409 static void lsp_update_data(struct isis_lsp
*lsp
, struct isis_lsp_hdr
*hdr
,
410 struct isis_tlvs
*tlvs
, struct stream
*stream
,
411 struct isis_area
*area
, int level
)
413 /* free the old lsp data */
416 /* copying only the relevant part of our stream */
417 if (lsp
->pdu
!= NULL
)
418 stream_free(lsp
->pdu
);
419 lsp
->pdu
= stream_dup(stream
);
421 memcpy(&lsp
->hdr
, hdr
, sizeof(lsp
->hdr
));
424 lsp
->age_out
= ZERO_AGE_LIFETIME
;
425 lsp
->installed
= time(NULL
);
429 if (area
->dynhostname
&& lsp
->tlvs
->hostname
) {
430 isis_dynhn_insert(lsp
->hdr
.lsp_id
, lsp
->tlvs
->hostname
,
431 (lsp
->hdr
.lsp_bits
& LSPBIT_IST
)
440 static void lsp_link_fragment(struct isis_lsp
*lsp
, struct isis_lsp
*lsp0
)
442 if (!LSP_FRAGMENT(lsp
->hdr
.lsp_id
)) {
443 /* zero lsp -> create list to store fragments */
444 lsp
->lspu
.frags
= list_new();
446 /* fragment -> set backpointer and add to zero lsps list */
448 lsp
->lspu
.zero_lsp
= lsp0
;
449 listnode_add(lsp0
->lspu
.frags
, lsp
);
453 void lsp_update(struct isis_lsp
*lsp
, struct isis_lsp_hdr
*hdr
,
454 struct isis_tlvs
*tlvs
, struct stream
*stream
,
455 struct isis_area
*area
, int level
, bool confusion
)
459 "ISIS-Upd (%s): BUG updating LSP %s still marked as own LSP",
460 area
->area_tag
, rawlspid_print(lsp
->hdr
.lsp_id
));
465 lsp_update_data(lsp
, hdr
, tlvs
, stream
, area
, level
);
467 lsp
->hdr
.rem_lifetime
= hdr
->rem_lifetime
= 0;
468 put_lsp_hdr(lsp
, NULL
, true);
471 if (LSP_FRAGMENT(lsp
->hdr
.lsp_id
) && !lsp
->lspu
.zero_lsp
) {
472 uint8_t lspid
[ISIS_SYS_ID_LEN
+ 2];
473 struct isis_lsp
*lsp0
;
475 memcpy(lspid
, lsp
->hdr
.lsp_id
, ISIS_SYS_ID_LEN
+ 1);
476 LSP_FRAGMENT(lspid
) = 0;
477 lsp0
= lsp_search(lspid
, area
->lspdb
[level
- 1]);
479 lsp_link_fragment(lsp
, lsp0
);
483 isis_spf_schedule(lsp
->area
, lsp
->level
);
486 /* creation of LSP directly from what we received */
487 struct isis_lsp
*lsp_new_from_recv(struct isis_lsp_hdr
*hdr
,
488 struct isis_tlvs
*tlvs
,
489 struct stream
*stream
, struct isis_lsp
*lsp0
,
490 struct isis_area
*area
, int level
)
492 struct isis_lsp
*lsp
;
494 lsp
= XCALLOC(MTYPE_ISIS_LSP
, sizeof(struct isis_lsp
));
495 lsp_update_data(lsp
, hdr
, tlvs
, stream
, area
, level
);
496 lsp_link_fragment(lsp
, lsp0
);
501 struct isis_lsp
*lsp_new(struct isis_area
*area
, u_char
*lsp_id
,
502 uint16_t rem_lifetime
, uint32_t seqno
,
503 uint8_t lsp_bits
, uint16_t checksum
,
504 struct isis_lsp
*lsp0
, int level
)
506 struct isis_lsp
*lsp
;
508 lsp
= XCALLOC(MTYPE_ISIS_LSP
, sizeof(struct isis_lsp
));
511 lsp
->pdu
= stream_new(LLC_LEN
+ area
->lsp_mtu
);
513 /* Minimal LSP PDU size */
514 lsp
->hdr
.pdu_len
= ISIS_FIXED_HDR_LEN
+ ISIS_LSP_HDR_LEN
;
515 memcpy(lsp
->hdr
.lsp_id
, lsp_id
, sizeof(lsp
->hdr
.lsp_id
));
516 lsp
->hdr
.checksum
= checksum
;
517 lsp
->hdr
.seqno
= seqno
;
518 lsp
->hdr
.rem_lifetime
= rem_lifetime
;
519 lsp
->hdr
.lsp_bits
= lsp_bits
;
521 lsp
->age_out
= ZERO_AGE_LIFETIME
;
522 lsp_link_fragment(lsp
, lsp0
);
523 put_lsp_hdr(lsp
, NULL
, false);
525 if (isis
->debugs
& DEBUG_EVENTS
)
526 zlog_debug("New LSP with ID %s-%02x-%02x len %d seqnum %08x",
527 sysid_print(lsp_id
), LSP_PSEUDO_ID(lsp
->hdr
.lsp_id
),
528 LSP_FRAGMENT(lsp
->hdr
.lsp_id
), lsp
->hdr
.pdu_len
,
534 void lsp_insert(struct isis_lsp
*lsp
, dict_t
*lspdb
)
536 dict_alloc_insert(lspdb
, lsp
->hdr
.lsp_id
, lsp
);
538 isis_spf_schedule(lsp
->area
, lsp
->level
);
542 * Build a list of LSPs with non-zero ht bounded by start and stop ids
544 void lsp_build_list_nonzero_ht(u_char
*start_id
, u_char
*stop_id
,
545 struct list
*list
, dict_t
*lspdb
)
547 dnode_t
*first
, *last
, *curr
;
549 first
= dict_lower_bound(lspdb
, start_id
);
553 last
= dict_upper_bound(lspdb
, stop_id
);
557 if (((struct isis_lsp
*)(curr
->dict_data
))->hdr
.rem_lifetime
)
558 listnode_add(list
, first
->dict_data
);
561 curr
= dict_next(lspdb
, curr
);
563 && ((struct isis_lsp
*)(curr
->dict_data
))->hdr
.rem_lifetime
)
564 listnode_add(list
, curr
->dict_data
);
572 static void lsp_set_time(struct isis_lsp
*lsp
)
576 if (lsp
->hdr
.rem_lifetime
== 0) {
577 if (lsp
->age_out
> 0)
582 lsp
->hdr
.rem_lifetime
--;
583 if (lsp
->pdu
&& stream_get_endp(lsp
->pdu
) >= 12)
584 stream_putw_at(lsp
->pdu
, 10, lsp
->hdr
.rem_lifetime
);
587 static void lspid_print(u_char
*lsp_id
, u_char
*trg
, char dynhost
, char frag
)
589 struct isis_dynhn
*dyn
= NULL
;
590 u_char id
[SYSID_STRLEN
];
593 dyn
= dynhn_find_by_id(lsp_id
);
598 sprintf((char *)id
, "%.14s", dyn
->hostname
);
599 else if (!memcmp(isis
->sysid
, lsp_id
, ISIS_SYS_ID_LEN
) && dynhost
)
600 sprintf((char *)id
, "%.14s", cmd_hostname_get());
602 memcpy(id
, sysid_print(lsp_id
), 15);
604 sprintf((char *)trg
, "%s.%02x-%02x", id
, LSP_PSEUDO_ID(lsp_id
),
605 LSP_FRAGMENT(lsp_id
));
607 sprintf((char *)trg
, "%s.%02x", id
, LSP_PSEUDO_ID(lsp_id
));
610 /* Convert the lsp attribute bits to attribute string */
611 static const char *lsp_bits2string(uint8_t lsp_bits
)
613 char *pos
= lsp_bits_string
;
618 /* we only focus on the default metric */
619 pos
+= sprintf(pos
, "%d/",
620 ISIS_MASK_LSP_ATT_DEFAULT_BIT(lsp_bits
) ? 1 : 0);
622 pos
+= sprintf(pos
, "%d/",
623 ISIS_MASK_LSP_PARTITION_BIT(lsp_bits
) ? 1 : 0);
625 pos
+= sprintf(pos
, "%d", ISIS_MASK_LSP_OL_BIT(lsp_bits
) ? 1 : 0);
629 return lsp_bits_string
;
632 /* this function prints the lsp on show isis database */
633 void lsp_print(struct isis_lsp
*lsp
, struct vty
*vty
, char dynhost
)
638 lspid_print(lsp
->hdr
.lsp_id
, LSPid
, dynhost
, 1);
639 vty_out(vty
, "%-21s%c ", LSPid
, lsp
->own_lsp
? '*' : ' ');
640 vty_out(vty
, "%5" PRIu16
" ", lsp
->hdr
.pdu_len
);
641 vty_out(vty
, "0x%08" PRIx32
" ", lsp
->hdr
.seqno
);
642 vty_out(vty
, "0x%04" PRIx16
" ", lsp
->hdr
.checksum
);
643 if (lsp
->hdr
.rem_lifetime
== 0) {
644 snprintf(age_out
, 8, "(%d)", lsp
->age_out
);
646 vty_out(vty
, "%7s ", age_out
);
648 vty_out(vty
, " %5" PRIu16
" ", lsp
->hdr
.rem_lifetime
);
649 vty_out(vty
, "%s\n", lsp_bits2string(lsp
->hdr
.lsp_bits
));
652 void lsp_print_detail(struct isis_lsp
*lsp
, struct vty
*vty
, char dynhost
)
654 lsp_print(lsp
, vty
, dynhost
);
656 vty_multiline(vty
, " ", "%s", isis_format_tlvs(lsp
->tlvs
));
660 /* print all the lsps info in the local lspdb */
661 int lsp_print_all(struct vty
*vty
, dict_t
*lspdb
, char detail
, char dynhost
)
664 dnode_t
*node
= dict_first(lspdb
), *next
;
667 if (detail
== ISIS_UI_LEVEL_BRIEF
) {
668 while (node
!= NULL
) {
669 /* I think it is unnecessary, so I comment it out */
670 /* dict_contains (lspdb, node); */
671 next
= dict_next(lspdb
, node
);
672 lsp_print(dnode_get(node
), vty
, dynhost
);
676 } else if (detail
== ISIS_UI_LEVEL_DETAIL
) {
677 while (node
!= NULL
) {
678 next
= dict_next(lspdb
, node
);
679 lsp_print_detail(dnode_get(node
), vty
, dynhost
);
688 static u_int16_t
lsp_rem_lifetime(struct isis_area
*area
, int level
)
690 u_int16_t rem_lifetime
;
692 /* Add jitter to configured LSP lifetime */
694 isis_jitter(area
->max_lsp_lifetime
[level
- 1], MAX_AGE_JITTER
);
696 /* No jitter if the max refresh will be less than configure gen interval
698 /* N.B. this calucation is acceptable since rem_lifetime is in
701 if (area
->lsp_gen_interval
[level
- 1] > (rem_lifetime
- 300))
702 rem_lifetime
= area
->max_lsp_lifetime
[level
- 1];
707 static u_int16_t
lsp_refresh_time(struct isis_lsp
*lsp
, u_int16_t rem_lifetime
)
709 struct isis_area
*area
= lsp
->area
;
710 int level
= lsp
->level
;
711 u_int16_t refresh_time
;
713 /* Add jitter to LSP refresh time */
715 isis_jitter(area
->lsp_refresh
[level
- 1], MAX_LSP_GEN_JITTER
);
717 /* RFC 4444 : make sure the refresh time is at least less than 300
718 * of the remaining lifetime and more than gen interval */
719 if (refresh_time
<= area
->lsp_gen_interval
[level
- 1]
720 || refresh_time
> (rem_lifetime
- 300))
721 refresh_time
= rem_lifetime
- 300;
723 /* In cornercases, refresh_time might be <= lsp_gen_interval, however
724 * we accept this violation to satisfy refresh_time <= rem_lifetime -
730 static void lsp_build_ext_reach_ipv4(struct isis_lsp
*lsp
,
731 struct isis_area
*area
)
733 struct route_table
*er_table
= get_ext_reach(area
, AF_INET
, lsp
->level
);
737 for (struct route_node
*rn
= route_top(er_table
); rn
;
738 rn
= route_next(rn
)) {
742 struct prefix_ipv4
*ipv4
= (struct prefix_ipv4
*)&rn
->p
;
743 struct isis_ext_info
*info
= rn
->info
;
745 uint32_t metric
= info
->metric
;
746 if (metric
> MAX_WIDE_PATH_METRIC
)
747 metric
= MAX_WIDE_PATH_METRIC
;
748 if (area
->oldmetric
&& metric
> 0x3f)
752 isis_tlvs_add_oldstyle_ip_reach(lsp
->tlvs
, ipv4
,
755 isis_tlvs_add_extended_ip_reach(lsp
->tlvs
, ipv4
,
760 static void lsp_build_ext_reach_ipv6(struct isis_lsp
*lsp
,
761 struct isis_area
*area
)
763 struct route_table
*er_table
=
764 get_ext_reach(area
, AF_INET6
, lsp
->level
);
768 for (struct route_node
*rn
= route_top(er_table
); rn
;
769 rn
= route_next(rn
)) {
773 struct prefix_ipv6
*ipv6
= (struct prefix_ipv6
*)&rn
->p
;
774 struct isis_ext_info
*info
= rn
->info
;
776 uint32_t metric
= info
->metric
;
777 if (info
->metric
> MAX_WIDE_PATH_METRIC
)
778 metric
= MAX_WIDE_PATH_METRIC
;
779 isis_tlvs_add_ipv6_reach(
780 lsp
->tlvs
, isis_area_ipv6_topology(area
), ipv6
, metric
);
784 static void lsp_build_ext_reach(struct isis_lsp
*lsp
, struct isis_area
*area
)
786 lsp_build_ext_reach_ipv4(lsp
, area
);
787 lsp_build_ext_reach_ipv6(lsp
, area
);
790 static struct isis_lsp
*lsp_next_frag(uint8_t frag_num
, struct isis_lsp
*lsp0
,
791 struct isis_area
*area
, int level
)
793 struct isis_lsp
*lsp
;
794 uint8_t frag_id
[ISIS_SYS_ID_LEN
+ 2];
796 memcpy(frag_id
, lsp0
->hdr
.lsp_id
, ISIS_SYS_ID_LEN
+ 1);
797 LSP_FRAGMENT(frag_id
) = frag_num
;
799 lsp
= lsp_search(frag_id
, area
->lspdb
[level
- 1]);
802 if (!lsp
->lspu
.zero_lsp
)
803 lsp_link_fragment(lsp
, lsp0
);
807 lsp
= lsp_new(area
, frag_id
, lsp0
->hdr
.rem_lifetime
, 0,
808 lsp_bits_generate(level
, area
->overload_bit
,
812 lsp_insert(lsp
, area
->lspdb
[level
- 1]);
817 * Builds the LSP data part. This func creates a new frag whenever
818 * area->lsp_frag_threshold is exceeded.
820 static void lsp_build(struct isis_lsp
*lsp
, struct isis_area
*area
)
822 int level
= lsp
->level
;
823 char buf
[PREFIX2STR_BUFFER
];
824 struct listnode
*node
;
825 struct isis_lsp
*frag
;
828 for (ALL_LIST_ELEMENTS_RO(lsp
->lspu
.frags
, node
, frag
))
829 lsp_clear_data(frag
);
831 lsp
->tlvs
= isis_alloc_tlvs();
832 lsp_debug("ISIS (%s): Constructing local system LSP for level %d",
833 area
->area_tag
, level
);
835 lsp
->hdr
.lsp_bits
= lsp_bits_generate(level
, area
->overload_bit
,
840 isis_tlvs_add_area_addresses(lsp
->tlvs
, area
->area_addrs
);
842 /* Protocols Supported */
843 if (area
->ip_circuits
> 0 || area
->ipv6_circuits
> 0) {
844 struct nlpids nlpids
= {.count
= 0};
845 if (area
->ip_circuits
> 0) {
847 "ISIS (%s): Found IPv4 circuit, adding IPv4 to NLPIDs",
849 nlpids
.nlpids
[nlpids
.count
] = NLPID_IP
;
852 if (area
->ipv6_circuits
> 0) {
854 "ISIS (%s): Found IPv6 circuit, adding IPv6 to NLPIDs",
856 nlpids
.nlpids
[nlpids
.count
] = NLPID_IPV6
;
859 isis_tlvs_set_protocols_supported(lsp
->tlvs
, &nlpids
);
862 if (area_is_mt(area
)) {
863 lsp_debug("ISIS (%s): Adding MT router tlv...", area
->area_tag
);
865 struct isis_area_mt_setting
**mt_settings
;
866 unsigned int mt_count
;
868 mt_settings
= area_mt_settings(area
, &mt_count
);
869 for (unsigned int i
= 0; i
< mt_count
; i
++) {
870 isis_tlvs_add_mt_router_info(
871 lsp
->tlvs
, mt_settings
[i
]->mtid
,
872 mt_settings
[i
]->overload
, false);
873 lsp_debug("ISIS (%s): MT %s", area
->area_tag
,
874 isis_mtid2str(mt_settings
[i
]->mtid
));
877 lsp_debug("ISIS (%s): Not adding MT router tlv (disabled)",
880 /* Dynamic Hostname */
881 if (area
->dynhostname
) {
882 isis_tlvs_set_dynamic_hostname(lsp
->tlvs
, cmd_hostname_get());
883 lsp_debug("ISIS (%s): Adding dynamic hostname '%s'",
884 area
->area_tag
, cmd_hostname_get());
886 lsp_debug("ISIS (%s): Not adding dynamic hostname (disabled)",
890 /* IPv4 address and TE router ID TLVs. In case of the first one we don't
891 * follow "C" vendor, but "J" vendor behavior - one IPv4 address is put
893 * LSP and this address is same as router id. */
894 if (isis
->router_id
!= 0) {
895 struct in_addr id
= {.s_addr
= isis
->router_id
};
896 inet_ntop(AF_INET
, &id
, buf
, sizeof(buf
));
897 lsp_debug("ISIS (%s): Adding router ID %s as IPv4 tlv.",
898 area
->area_tag
, buf
);
899 isis_tlvs_add_ipv4_address(lsp
->tlvs
, &id
);
901 /* Exactly same data is put into TE router ID TLV, but only if
903 * TLV's are in use. */
904 if (area
->newmetric
) {
907 "ISIS (%s): Adding router ID also as TE router ID tlv.",
909 isis_tlvs_set_te_router_id(lsp
->tlvs
, &id
);
912 lsp_debug("ISIS (%s): Router ID is unset. Not adding tlv.",
916 lsp_debug("ISIS (%s): Adding circuit specific information.",
919 struct isis_circuit
*circuit
;
920 for (ALL_LIST_ELEMENTS_RO(area
->circuit_list
, node
, circuit
)) {
921 if (!circuit
->interface
)
923 "ISIS (%s): Processing %s circuit %p with unknown interface",
925 circuit_type2string(circuit
->circ_type
),
928 lsp_debug("ISIS (%s): Processing %s circuit %s",
930 circuit_type2string(circuit
->circ_type
),
931 circuit
->interface
->name
);
933 if (circuit
->state
!= C_STATE_UP
) {
934 lsp_debug("ISIS (%s): Circuit is not up, ignoring.",
939 uint32_t metric
= area
->oldmetric
940 ? circuit
->metric
[level
- 1]
941 : circuit
->te_metric
[level
- 1];
943 if (circuit
->ip_router
&& circuit
->ip_addrs
944 && circuit
->ip_addrs
->count
> 0) {
946 "ISIS (%s): Circuit has IPv4 active, adding respective TLVs.",
948 struct listnode
*ipnode
;
949 struct prefix_ipv4
*ipv4
;
950 for (ALL_LIST_ELEMENTS_RO(circuit
->ip_addrs
, ipnode
,
952 if (area
->oldmetric
) {
954 "ISIS (%s): Adding old-style IP reachability for %s",
956 prefix2str(ipv4
, buf
,
958 isis_tlvs_add_oldstyle_ip_reach(
959 lsp
->tlvs
, ipv4
, metric
);
962 if (area
->newmetric
) {
964 "ISIS (%s): Adding te-style IP reachability for %s",
966 prefix2str(ipv4
, buf
,
968 isis_tlvs_add_extended_ip_reach(
969 lsp
->tlvs
, ipv4
, metric
);
974 if (circuit
->ipv6_router
&& circuit
->ipv6_non_link
975 && circuit
->ipv6_non_link
->count
> 0) {
976 struct listnode
*ipnode
;
977 struct prefix_ipv6
*ipv6
;
978 for (ALL_LIST_ELEMENTS_RO(circuit
->ipv6_non_link
,
981 "ISIS (%s): Adding IPv6 reachability for %s",
983 prefix2str(ipv6
, buf
, sizeof(buf
)));
984 isis_tlvs_add_ipv6_reach(
986 isis_area_ipv6_topology(area
), ipv6
,
991 switch (circuit
->circ_type
) {
992 case CIRCUIT_T_BROADCAST
:
993 if (level
& circuit
->is_type
) {
995 (level
== IS_LEVEL_1
)
996 ? circuit
->u
.bc
.l1_desig_is
997 : circuit
->u
.bc
.l2_desig_is
;
999 if (LSP_PSEUDO_ID(ne_id
)) {
1000 if (area
->oldmetric
) {
1002 "ISIS (%s): Adding DIS %s.%02x as old-style neighbor",
1005 LSP_PSEUDO_ID(ne_id
));
1006 isis_tlvs_add_oldstyle_reach(
1010 if (area
->newmetric
) {
1011 uint8_t subtlvs
[256];
1014 if (IS_MPLS_TE(isisMplsTE
)
1016 circuit
->interface
))
1017 subtlv_len
= add_te_subtlvs(
1025 level
, ne_id
, metric
,
1026 subtlvs
, subtlv_len
);
1031 "ISIS (%s): Circuit is not active for current level. Not adding IS neighbors",
1035 case CIRCUIT_T_P2P
: {
1036 struct isis_adjacency
*nei
= circuit
->u
.p2p
.neighbor
;
1037 if (nei
&& (level
& nei
->circuit_t
)) {
1039 memcpy(ne_id
, nei
->sysid
, ISIS_SYS_ID_LEN
);
1040 LSP_PSEUDO_ID(ne_id
) = 0;
1042 if (area
->oldmetric
) {
1044 "ISIS (%s): Adding old-style is reach for %s",
1046 sysid_print(ne_id
));
1047 isis_tlvs_add_oldstyle_reach(
1048 lsp
->tlvs
, ne_id
, metric
);
1050 if (area
->newmetric
) {
1051 uint8_t subtlvs
[256];
1054 if (IS_MPLS_TE(isisMplsTE
)
1056 circuit
->interface
))
1057 /* Update Local and Remote IP
1058 * address for MPLS TE circuit
1060 /* NOTE sure that it is the
1061 * pertinent place for that
1063 /* Local IP address could be
1064 * updated in isis_circuit.c -
1065 * isis_circuit_add_addr() */
1066 /* But, where update remote IP
1067 * address ? in isis_pdu.c -
1068 * process_p2p_hello() ? */
1070 /* Add SubTLVs & Adjust real
1071 * size of SubTLVs */
1072 subtlv_len
= add_te_subtlvs(
1073 subtlvs
, circuit
->mtc
);
1075 /* Or keep only TE metric with
1076 * no SubTLVs if MPLS_TE is off
1080 tlvs_add_mt_p2p(lsp
->tlvs
, circuit
,
1081 ne_id
, metric
, subtlvs
,
1086 "ISIS (%s): No adjacency for given level on this circuit. Not adding IS neighbors",
1090 case CIRCUIT_T_LOOPBACK
:
1093 zlog_warn("lsp_area_create: unknown circuit type");
1097 lsp_build_ext_reach(lsp
, area
);
1099 struct isis_tlvs
*tlvs
= lsp
->tlvs
;
1103 size_t tlv_space
= STREAM_WRITEABLE(lsp
->pdu
) - LLC_LEN
;
1104 lsp_clear_data(lsp
);
1106 struct list
*fragments
= isis_fragment_tlvs(tlvs
, tlv_space
);
1108 zlog_warn("BUG: could not fragment own LSP:");
1109 log_multiline(LOG_WARNING
, " ", "%s", isis_format_tlvs(tlvs
));
1110 isis_free_tlvs(tlvs
);
1113 isis_free_tlvs(tlvs
);
1115 bool fragment_overflow
= false;
1117 for (ALL_LIST_ELEMENTS_RO(fragments
, node
, tlvs
)) {
1118 if (node
!= listhead(fragments
)) {
1119 if (LSP_FRAGMENT(frag
->hdr
.lsp_id
) == 255) {
1120 if (!fragment_overflow
) {
1121 fragment_overflow
= true;
1122 zlog_warn("ISIS (%s): Too much information for 256 fragments",
1125 isis_free_tlvs(tlvs
);
1129 frag
= lsp_next_frag(LSP_FRAGMENT(frag
->hdr
.lsp_id
) + 1,
1135 list_delete_and_null(&fragments
);
1136 lsp_debug("ISIS (%s): LSP construction is complete. Serializing...",
1142 * 7.3.7 and 7.3.9 Generation on non-pseudonode LSPs
1144 int lsp_generate(struct isis_area
*area
, int level
)
1146 struct isis_lsp
*oldlsp
, *newlsp
;
1147 u_int32_t seq_num
= 0;
1148 u_char lspid
[ISIS_SYS_ID_LEN
+ 2];
1149 u_int16_t rem_lifetime
, refresh_time
;
1151 if ((area
== NULL
) || (area
->is_type
& level
) != level
)
1154 memset(&lspid
, 0, ISIS_SYS_ID_LEN
+ 2);
1155 memcpy(&lspid
, isis
->sysid
, ISIS_SYS_ID_LEN
);
1157 /* only builds the lsp if the area shares the level */
1158 oldlsp
= lsp_search(lspid
, area
->lspdb
[level
- 1]);
1160 /* FIXME: we should actually initiate a purge */
1161 seq_num
= oldlsp
->hdr
.seqno
;
1162 lsp_search_and_destroy(oldlsp
->hdr
.lsp_id
,
1163 area
->lspdb
[level
- 1]);
1165 rem_lifetime
= lsp_rem_lifetime(area
, level
);
1167 lsp_new(area
, lspid
, rem_lifetime
, seq_num
,
1168 area
->is_type
| area
->overload_bit
| area
->attached_bit
,
1170 newlsp
->area
= area
;
1171 newlsp
->own_lsp
= 1;
1173 lsp_insert(newlsp
, area
->lspdb
[level
- 1]);
1174 /* build_lsp_data (newlsp, area); */
1175 lsp_build(newlsp
, area
);
1176 /* time to calculate our checksum */
1177 lsp_seqno_update(newlsp
);
1178 newlsp
->last_generated
= time(NULL
);
1179 lsp_set_all_srmflags(newlsp
);
1181 refresh_time
= lsp_refresh_time(newlsp
, rem_lifetime
);
1183 THREAD_TIMER_OFF(area
->t_lsp_refresh
[level
- 1]);
1184 area
->lsp_regenerate_pending
[level
- 1] = 0;
1185 if (level
== IS_LEVEL_1
)
1186 thread_add_timer(master
, lsp_l1_refresh
, area
, refresh_time
,
1187 &area
->t_lsp_refresh
[level
- 1]);
1188 else if (level
== IS_LEVEL_2
)
1189 thread_add_timer(master
, lsp_l2_refresh
, area
, refresh_time
,
1190 &area
->t_lsp_refresh
[level
- 1]);
1192 if (isis
->debugs
& DEBUG_UPDATE_PACKETS
) {
1193 zlog_debug("ISIS-Upd (%s): Building L%d LSP %s, len %" PRIu16
1194 ", seq 0x%08" PRIx32
", cksum 0x%04" PRIx16
1195 ", lifetime %" PRIu16
"s refresh %" PRIu16
"s",
1196 area
->area_tag
, level
,
1197 rawlspid_print(newlsp
->hdr
.lsp_id
),
1198 newlsp
->hdr
.pdu_len
, newlsp
->hdr
.seqno
,
1199 newlsp
->hdr
.checksum
, newlsp
->hdr
.rem_lifetime
,
1203 "ISIS (%s): Built L%d LSP. Set triggered regenerate to non-pending.",
1204 area
->area_tag
, level
);
1210 * Search own LSPs, update holding time and set SRM
1212 static int lsp_regenerate(struct isis_area
*area
, int level
)
1215 struct isis_lsp
*lsp
, *frag
;
1216 struct listnode
*node
;
1217 u_char lspid
[ISIS_SYS_ID_LEN
+ 2];
1218 u_int16_t rem_lifetime
, refresh_time
;
1220 if ((area
== NULL
) || (area
->is_type
& level
) != level
)
1223 lspdb
= area
->lspdb
[level
- 1];
1225 memset(lspid
, 0, ISIS_SYS_ID_LEN
+ 2);
1226 memcpy(lspid
, isis
->sysid
, ISIS_SYS_ID_LEN
);
1228 lsp
= lsp_search(lspid
, lspdb
);
1231 zlog_err("ISIS-Upd (%s): lsp_regenerate: no L%d LSP found!",
1232 area
->area_tag
, level
);
1236 lsp_clear_data(lsp
);
1237 lsp_build(lsp
, area
);
1238 rem_lifetime
= lsp_rem_lifetime(area
, level
);
1239 lsp
->hdr
.rem_lifetime
= rem_lifetime
;
1240 lsp
->last_generated
= time(NULL
);
1241 lsp_set_all_srmflags(lsp
);
1242 for (ALL_LIST_ELEMENTS_RO(lsp
->lspu
.frags
, node
, frag
)) {
1243 frag
->hdr
.lsp_bits
= lsp_bits_generate(
1244 level
, area
->overload_bit
, area
->attached_bit
);
1245 /* Set the lifetime values of all the fragments to the same
1247 * so that no fragment expires before the lsp is refreshed.
1249 frag
->hdr
.rem_lifetime
= rem_lifetime
;
1250 frag
->age_out
= ZERO_AGE_LIFETIME
;
1251 lsp_set_all_srmflags(frag
);
1253 lsp_seqno_update(lsp
);
1255 refresh_time
= lsp_refresh_time(lsp
, rem_lifetime
);
1256 if (level
== IS_LEVEL_1
)
1257 thread_add_timer(master
, lsp_l1_refresh
, area
, refresh_time
,
1258 &area
->t_lsp_refresh
[level
- 1]);
1259 else if (level
== IS_LEVEL_2
)
1260 thread_add_timer(master
, lsp_l2_refresh
, area
, refresh_time
,
1261 &area
->t_lsp_refresh
[level
- 1]);
1262 area
->lsp_regenerate_pending
[level
- 1] = 0;
1264 if (isis
->debugs
& DEBUG_UPDATE_PACKETS
) {
1266 "ISIS-Upd (%s): Refreshed our L%d LSP %s, len %" PRIu16
1267 ", seq 0x%08" PRIx32
", cksum 0x%04" PRIx16
1268 ", lifetime %" PRIu16
"s refresh %" PRIu16
"s",
1269 area
->area_tag
, level
, rawlspid_print(lsp
->hdr
.lsp_id
),
1270 lsp
->hdr
.pdu_len
, lsp
->hdr
.seqno
, lsp
->hdr
.checksum
,
1271 lsp
->hdr
.rem_lifetime
, refresh_time
);
1274 "ISIS (%s): Rebuilt L%d LSP. Set triggered regenerate to non-pending.",
1275 area
->area_tag
, level
);
1281 * Something has changed or periodic refresh -> regenerate LSP
1283 static int lsp_l1_refresh(struct thread
*thread
)
1285 struct isis_area
*area
;
1287 area
= THREAD_ARG(thread
);
1290 area
->t_lsp_refresh
[0] = NULL
;
1291 area
->lsp_regenerate_pending
[0] = 0;
1293 if ((area
->is_type
& IS_LEVEL_1
) == 0)
1297 "ISIS (%s): LSP L1 refresh timer expired. Refreshing LSP...",
1299 return lsp_regenerate(area
, IS_LEVEL_1
);
1302 static int lsp_l2_refresh(struct thread
*thread
)
1304 struct isis_area
*area
;
1306 area
= THREAD_ARG(thread
);
1309 area
->t_lsp_refresh
[1] = NULL
;
1310 area
->lsp_regenerate_pending
[1] = 0;
1312 if ((area
->is_type
& IS_LEVEL_2
) == 0)
1316 "ISIS (%s): LSP L2 refresh timer expired. Refreshing LSP...",
1318 return lsp_regenerate(area
, IS_LEVEL_2
);
1321 int lsp_regenerate_schedule(struct isis_area
*area
, int level
, int all_pseudo
)
1323 struct isis_lsp
*lsp
;
1324 u_char id
[ISIS_SYS_ID_LEN
+ 2];
1327 struct listnode
*cnode
;
1328 struct isis_circuit
*circuit
;
1335 "ISIS (%s): Scheduling regeneration of %s LSPs, %sincluding PSNs",
1336 area
->area_tag
, circuit_t2string(level
),
1337 all_pseudo
? "" : "not ");
1339 memcpy(id
, isis
->sysid
, ISIS_SYS_ID_LEN
);
1340 LSP_PSEUDO_ID(id
) = LSP_FRAGMENT(id
) = 0;
1343 for (lvl
= IS_LEVEL_1
; lvl
<= IS_LEVEL_2
; lvl
++) {
1344 if (!((level
& lvl
) && (area
->is_type
& lvl
)))
1348 "ISIS (%s): Checking whether L%d needs to be scheduled",
1349 area
->area_tag
, lvl
);
1351 if (area
->lsp_regenerate_pending
[lvl
- 1]) {
1352 struct timeval remain
= thread_timer_remain(
1353 area
->t_lsp_refresh
[lvl
- 1]);
1355 "ISIS (%s): Regeneration is already pending, nothing todo."
1356 " (Due in %lld.%03lld seconds)",
1357 area
->area_tag
, (long long)remain
.tv_sec
,
1358 (long long)remain
.tv_usec
/ 1000);
1362 lsp
= lsp_search(id
, area
->lspdb
[lvl
- 1]);
1365 "ISIS (%s): We do not have any LSPs to regenerate, nothing todo.",
1371 * Throttle avoidance
1374 "ISIS (%s): Will schedule regen timer. Last run was: %lld, Now is: %lld",
1375 area
->area_tag
, (long long)lsp
->last_generated
,
1377 THREAD_TIMER_OFF(area
->t_lsp_refresh
[lvl
- 1]);
1378 diff
= now
- lsp
->last_generated
;
1379 if (diff
< area
->lsp_gen_interval
[lvl
- 1]) {
1381 1000 * (area
->lsp_gen_interval
[lvl
- 1] - diff
);
1383 "ISIS (%s): Scheduling in %ld ms to match configured lsp_gen_interval",
1384 area
->area_tag
, timeout
);
1387 * lsps are not regenerated if lsp_regenerate function
1389 * directly. However if the lsp_regenerate call is
1391 * later execution it works.
1395 "ISIS (%s): Last generation was more than lsp_gen_interval ago."
1396 " Scheduling for execution in %ld ms.",
1397 area
->area_tag
, timeout
);
1400 area
->lsp_regenerate_pending
[lvl
- 1] = 1;
1401 if (lvl
== IS_LEVEL_1
) {
1402 thread_add_timer_msec(master
, lsp_l1_refresh
, area
,
1404 &area
->t_lsp_refresh
[lvl
- 1]);
1405 } else if (lvl
== IS_LEVEL_2
) {
1406 thread_add_timer_msec(master
, lsp_l2_refresh
, area
,
1408 &area
->t_lsp_refresh
[lvl
- 1]);
1413 for (ALL_LIST_ELEMENTS_RO(area
->circuit_list
, cnode
, circuit
))
1414 lsp_regenerate_schedule_pseudo(circuit
, level
);
1421 * Funcs for pseudonode LSPs
1425 * 7.3.8 and 7.3.10 Generation of level 1 and 2 pseudonode LSPs
1427 static void lsp_build_pseudo(struct isis_lsp
*lsp
, struct isis_circuit
*circuit
,
1430 struct isis_adjacency
*adj
;
1431 struct list
*adj_list
;
1432 struct listnode
*node
;
1433 struct isis_area
*area
= circuit
->area
;
1435 lsp_clear_data(lsp
);
1436 lsp
->tlvs
= isis_alloc_tlvs();
1438 "ISIS (%s): Constructing pseudo LSP %s for interface %s level %d",
1439 area
->area_tag
, rawlspid_print(lsp
->hdr
.lsp_id
),
1440 circuit
->interface
->name
, level
);
1443 /* RFC3787 section 4 SHOULD not set overload bit in pseudo LSPs */
1445 lsp_bits_generate(level
, 0, circuit
->area
->attached_bit
);
1448 * add self to IS neighbours
1450 uint8_t ne_id
[ISIS_SYS_ID_LEN
+ 1];
1452 memcpy(ne_id
, isis
->sysid
, ISIS_SYS_ID_LEN
);
1453 LSP_PSEUDO_ID(ne_id
) = 0;
1455 if (circuit
->area
->oldmetric
) {
1456 isis_tlvs_add_oldstyle_reach(lsp
->tlvs
, ne_id
, 0);
1458 "ISIS (%s): Adding %s.%02x as old-style neighbor (self)",
1459 area
->area_tag
, sysid_print(ne_id
),
1460 LSP_PSEUDO_ID(ne_id
));
1462 if (circuit
->area
->newmetric
) {
1463 isis_tlvs_add_extended_reach(lsp
->tlvs
, ISIS_MT_IPV4_UNICAST
,
1466 "ISIS (%s): Adding %s.%02x as te-style neighbor (self)",
1467 area
->area_tag
, sysid_print(ne_id
),
1468 LSP_PSEUDO_ID(ne_id
));
1471 adj_list
= list_new();
1472 isis_adj_build_up_list(circuit
->u
.bc
.adjdb
[level
- 1], adj_list
);
1474 for (ALL_LIST_ELEMENTS_RO(adj_list
, node
, adj
)) {
1475 if (!(adj
->level
& level
)) {
1477 "ISIS (%s): Ignoring neighbor %s, level does not intersect",
1478 area
->area_tag
, sysid_print(adj
->sysid
));
1482 if (!(level
== IS_LEVEL_1
1483 && adj
->sys_type
== ISIS_SYSTYPE_L1_IS
)
1484 && !(level
== IS_LEVEL_1
1485 && adj
->sys_type
== ISIS_SYSTYPE_L2_IS
1486 && adj
->adj_usage
== ISIS_ADJ_LEVEL1AND2
)
1487 && !(level
== IS_LEVEL_2
1488 && adj
->sys_type
== ISIS_SYSTYPE_L2_IS
)) {
1490 "ISIS (%s): Ignoring neighbor %s, level does not match",
1491 area
->area_tag
, sysid_print(adj
->sysid
));
1495 memcpy(ne_id
, adj
->sysid
, ISIS_SYS_ID_LEN
);
1496 if (circuit
->area
->oldmetric
) {
1497 isis_tlvs_add_oldstyle_reach(lsp
->tlvs
, ne_id
, 0);
1499 "ISIS (%s): Adding %s.%02x as old-style neighbor (peer)",
1500 area
->area_tag
, sysid_print(ne_id
),
1501 LSP_PSEUDO_ID(ne_id
));
1503 if (circuit
->area
->newmetric
) {
1504 isis_tlvs_add_extended_reach(lsp
->tlvs
,
1505 ISIS_MT_IPV4_UNICAST
,
1508 "ISIS (%s): Adding %s.%02x as te-style neighbor (peer)",
1509 area
->area_tag
, sysid_print(ne_id
),
1510 LSP_PSEUDO_ID(ne_id
));
1513 list_delete_and_null(&adj_list
);
1517 int lsp_generate_pseudo(struct isis_circuit
*circuit
, int level
)
1519 dict_t
*lspdb
= circuit
->area
->lspdb
[level
- 1];
1520 struct isis_lsp
*lsp
;
1521 u_char lsp_id
[ISIS_SYS_ID_LEN
+ 2];
1522 u_int16_t rem_lifetime
, refresh_time
;
1524 if ((circuit
->is_type
& level
) != level
1525 || (circuit
->state
!= C_STATE_UP
)
1526 || (circuit
->circ_type
!= CIRCUIT_T_BROADCAST
)
1527 || (circuit
->u
.bc
.is_dr
[level
- 1] == 0))
1530 memcpy(lsp_id
, isis
->sysid
, ISIS_SYS_ID_LEN
);
1531 LSP_FRAGMENT(lsp_id
) = 0;
1532 LSP_PSEUDO_ID(lsp_id
) = circuit
->circuit_id
;
1535 * If for some reason have a pseudo LSP in the db already -> regenerate
1537 if (lsp_search(lsp_id
, lspdb
))
1538 return lsp_regenerate_schedule_pseudo(circuit
, level
);
1540 rem_lifetime
= lsp_rem_lifetime(circuit
->area
, level
);
1541 /* RFC3787 section 4 SHOULD not set overload bit in pseudo LSPs */
1542 lsp
= lsp_new(circuit
->area
, lsp_id
, rem_lifetime
, 1,
1543 circuit
->area
->is_type
| circuit
->area
->attached_bit
, 0,
1545 lsp
->area
= circuit
->area
;
1547 lsp_build_pseudo(lsp
, circuit
, level
);
1550 lsp_insert(lsp
, lspdb
);
1551 lsp_set_all_srmflags(lsp
);
1553 refresh_time
= lsp_refresh_time(lsp
, rem_lifetime
);
1554 THREAD_TIMER_OFF(circuit
->u
.bc
.t_refresh_pseudo_lsp
[level
- 1]);
1555 circuit
->lsp_regenerate_pending
[level
- 1] = 0;
1556 if (level
== IS_LEVEL_1
)
1558 master
, lsp_l1_refresh_pseudo
, circuit
, refresh_time
,
1559 &circuit
->u
.bc
.t_refresh_pseudo_lsp
[level
- 1]);
1560 else if (level
== IS_LEVEL_2
)
1562 master
, lsp_l2_refresh_pseudo
, circuit
, refresh_time
,
1563 &circuit
->u
.bc
.t_refresh_pseudo_lsp
[level
- 1]);
1565 if (isis
->debugs
& DEBUG_UPDATE_PACKETS
) {
1567 "ISIS-Upd (%s): Built L%d Pseudo LSP %s, len %" PRIu16
1568 ", seq 0x%08" PRIx32
", cksum 0x%04" PRIx16
1569 ", lifetime %" PRIu16
"s, refresh %" PRIu16
"s",
1570 circuit
->area
->area_tag
, level
,
1571 rawlspid_print(lsp
->hdr
.lsp_id
), lsp
->hdr
.pdu_len
,
1572 lsp
->hdr
.seqno
, lsp
->hdr
.checksum
,
1573 lsp
->hdr
.rem_lifetime
, refresh_time
);
1579 static int lsp_regenerate_pseudo(struct isis_circuit
*circuit
, int level
)
1581 dict_t
*lspdb
= circuit
->area
->lspdb
[level
- 1];
1582 struct isis_lsp
*lsp
;
1583 u_char lsp_id
[ISIS_SYS_ID_LEN
+ 2];
1584 u_int16_t rem_lifetime
, refresh_time
;
1586 if ((circuit
->is_type
& level
) != level
1587 || (circuit
->state
!= C_STATE_UP
)
1588 || (circuit
->circ_type
!= CIRCUIT_T_BROADCAST
)
1589 || (circuit
->u
.bc
.is_dr
[level
- 1] == 0))
1592 memcpy(lsp_id
, isis
->sysid
, ISIS_SYS_ID_LEN
);
1593 LSP_PSEUDO_ID(lsp_id
) = circuit
->circuit_id
;
1594 LSP_FRAGMENT(lsp_id
) = 0;
1596 lsp
= lsp_search(lsp_id
, lspdb
);
1599 zlog_err("lsp_regenerate_pseudo: no l%d LSP %s found!", level
,
1600 rawlspid_print(lsp_id
));
1604 rem_lifetime
= lsp_rem_lifetime(circuit
->area
, level
);
1605 lsp
->hdr
.rem_lifetime
= rem_lifetime
;
1606 lsp_build_pseudo(lsp
, circuit
, level
);
1607 lsp_inc_seqno(lsp
, 0);
1608 lsp
->last_generated
= time(NULL
);
1609 lsp_set_all_srmflags(lsp
);
1611 refresh_time
= lsp_refresh_time(lsp
, rem_lifetime
);
1612 if (level
== IS_LEVEL_1
)
1614 master
, lsp_l1_refresh_pseudo
, circuit
, refresh_time
,
1615 &circuit
->u
.bc
.t_refresh_pseudo_lsp
[level
- 1]);
1616 else if (level
== IS_LEVEL_2
)
1618 master
, lsp_l2_refresh_pseudo
, circuit
, refresh_time
,
1619 &circuit
->u
.bc
.t_refresh_pseudo_lsp
[level
- 1]);
1621 if (isis
->debugs
& DEBUG_UPDATE_PACKETS
) {
1623 "ISIS-Upd (%s): Refreshed L%d Pseudo LSP %s, len %" PRIu16
1624 ", seq 0x%08" PRIx32
", cksum 0x%04" PRIx16
1625 ", lifetime %" PRIu16
"s, refresh %" PRIu16
"s",
1626 circuit
->area
->area_tag
, level
,
1627 rawlspid_print(lsp
->hdr
.lsp_id
), lsp
->hdr
.pdu_len
,
1628 lsp
->hdr
.seqno
, lsp
->hdr
.checksum
,
1629 lsp
->hdr
.rem_lifetime
, refresh_time
);
1636 * Something has changed or periodic refresh -> regenerate pseudo LSP
1638 static int lsp_l1_refresh_pseudo(struct thread
*thread
)
1640 struct isis_circuit
*circuit
;
1641 u_char id
[ISIS_SYS_ID_LEN
+ 2];
1643 circuit
= THREAD_ARG(thread
);
1645 circuit
->u
.bc
.t_refresh_pseudo_lsp
[0] = NULL
;
1646 circuit
->lsp_regenerate_pending
[0] = 0;
1648 if ((circuit
->u
.bc
.is_dr
[0] == 0)
1649 || (circuit
->is_type
& IS_LEVEL_1
) == 0) {
1650 memcpy(id
, isis
->sysid
, ISIS_SYS_ID_LEN
);
1651 LSP_PSEUDO_ID(id
) = circuit
->circuit_id
;
1652 LSP_FRAGMENT(id
) = 0;
1653 lsp_purge_pseudo(id
, circuit
, IS_LEVEL_1
);
1657 return lsp_regenerate_pseudo(circuit
, IS_LEVEL_1
);
1660 static int lsp_l2_refresh_pseudo(struct thread
*thread
)
1662 struct isis_circuit
*circuit
;
1663 u_char id
[ISIS_SYS_ID_LEN
+ 2];
1665 circuit
= THREAD_ARG(thread
);
1667 circuit
->u
.bc
.t_refresh_pseudo_lsp
[1] = NULL
;
1668 circuit
->lsp_regenerate_pending
[1] = 0;
1670 if ((circuit
->u
.bc
.is_dr
[1] == 0)
1671 || (circuit
->is_type
& IS_LEVEL_2
) == 0) {
1672 memcpy(id
, isis
->sysid
, ISIS_SYS_ID_LEN
);
1673 LSP_PSEUDO_ID(id
) = circuit
->circuit_id
;
1674 LSP_FRAGMENT(id
) = 0;
1675 lsp_purge_pseudo(id
, circuit
, IS_LEVEL_2
);
1679 return lsp_regenerate_pseudo(circuit
, IS_LEVEL_2
);
1682 int lsp_regenerate_schedule_pseudo(struct isis_circuit
*circuit
, int level
)
1684 struct isis_lsp
*lsp
;
1685 u_char lsp_id
[ISIS_SYS_ID_LEN
+ 2];
1689 struct isis_area
*area
= circuit
->area
;
1691 if (circuit
->circ_type
!= CIRCUIT_T_BROADCAST
1692 || circuit
->state
!= C_STATE_UP
)
1696 "ISIS (%s): Scheduling regeneration of %s pseudo LSP for interface %s",
1697 area
->area_tag
, circuit_t2string(level
),
1698 circuit
->interface
->name
);
1700 memcpy(lsp_id
, isis
->sysid
, ISIS_SYS_ID_LEN
);
1701 LSP_PSEUDO_ID(lsp_id
) = circuit
->circuit_id
;
1702 LSP_FRAGMENT(lsp_id
) = 0;
1705 for (lvl
= IS_LEVEL_1
; lvl
<= IS_LEVEL_2
; lvl
++) {
1707 "ISIS (%s): Checking whether L%d pseudo LSP needs to be scheduled",
1708 area
->area_tag
, lvl
);
1710 if (!((level
& lvl
) && (circuit
->is_type
& lvl
))) {
1711 sched_debug("ISIS (%s): Level is not active on circuit",
1716 if (circuit
->u
.bc
.is_dr
[lvl
- 1] == 0) {
1718 "ISIS (%s): This IS is not DR, nothing to do.",
1723 if (circuit
->lsp_regenerate_pending
[lvl
- 1]) {
1724 struct timeval remain
= thread_timer_remain(
1725 circuit
->u
.bc
.t_refresh_pseudo_lsp
[lvl
- 1]);
1727 "ISIS (%s): Regenerate is already pending, nothing todo."
1728 " (Due in %lld.%03lld seconds)",
1729 area
->area_tag
, (long long)remain
.tv_sec
,
1730 (long long)remain
.tv_usec
/ 1000);
1734 lsp
= lsp_search(lsp_id
, circuit
->area
->lspdb
[lvl
- 1]);
1737 "ISIS (%s): Pseudonode LSP does not exist yet, nothing to regenerate.",
1743 * Throttle avoidance
1746 "ISIS (%s): Will schedule PSN regen timer. Last run was: %lld, Now is: %lld",
1747 area
->area_tag
, (long long)lsp
->last_generated
,
1749 THREAD_TIMER_OFF(circuit
->u
.bc
.t_refresh_pseudo_lsp
[lvl
- 1]);
1750 diff
= now
- lsp
->last_generated
;
1751 if (diff
< circuit
->area
->lsp_gen_interval
[lvl
- 1]) {
1753 1000 * (circuit
->area
->lsp_gen_interval
[lvl
- 1]
1756 "ISIS (%s): Sechduling in %ld ms to match configured lsp_gen_interval",
1757 area
->area_tag
, timeout
);
1761 "ISIS (%s): Last generation was more than lsp_gen_interval ago."
1762 " Scheduling for execution in %ld ms.",
1763 area
->area_tag
, timeout
);
1766 circuit
->lsp_regenerate_pending
[lvl
- 1] = 1;
1768 if (lvl
== IS_LEVEL_1
) {
1769 thread_add_timer_msec(
1770 master
, lsp_l1_refresh_pseudo
, circuit
, timeout
,
1771 &circuit
->u
.bc
.t_refresh_pseudo_lsp
[lvl
- 1]);
1772 } else if (lvl
== IS_LEVEL_2
) {
1773 thread_add_timer_msec(
1774 master
, lsp_l2_refresh_pseudo
, circuit
, timeout
,
1775 &circuit
->u
.bc
.t_refresh_pseudo_lsp
[lvl
- 1]);
1783 * Walk through LSPs for an area
1784 * - set remaining lifetime
1785 * - set LSPs with SRMflag set for sending
1787 int lsp_tick(struct thread
*thread
)
1789 struct isis_area
*area
;
1790 struct isis_circuit
*circuit
;
1791 struct isis_lsp
*lsp
;
1792 struct list
*lsp_list
;
1793 struct listnode
*lspnode
, *cnode
;
1794 dnode_t
*dnode
, *dnode_next
;
1796 u_int16_t rem_lifetime
;
1797 time_t now
= monotime(NULL
);
1799 lsp_list
= list_new();
1801 area
= THREAD_ARG(thread
);
1803 area
->t_tick
= NULL
;
1804 thread_add_timer(master
, lsp_tick
, area
, 1, &area
->t_tick
);
1807 * Build a list of LSPs with (any) SRMflag set
1808 * and removed the ones that have aged out
1810 for (level
= 0; level
< ISIS_LEVELS
; level
++) {
1811 if (area
->lspdb
[level
] && dict_count(area
->lspdb
[level
]) > 0) {
1812 for (dnode
= dict_first(area
->lspdb
[level
]);
1813 dnode
!= NULL
; dnode
= dnode_next
) {
1815 dict_next(area
->lspdb
[level
], dnode
);
1816 lsp
= dnode_get(dnode
);
1819 * The lsp rem_lifetime is kept at 0 for MaxAge
1821 * ZeroAgeLifetime depending on explicit purge
1823 * natural age out. So schedule spf only once
1825 * the first time rem_lifetime becomes 0.
1827 rem_lifetime
= lsp
->hdr
.rem_lifetime
;
1831 * Schedule may run spf which should be done
1833 * the lsp rem_lifetime becomes 0 for the first
1835 * ISO 10589 - 7.3.16.4 first paragraph.
1837 if (rem_lifetime
== 1 && lsp
->hdr
.seqno
!= 0) {
1838 /* 7.3.16.4 a) set SRM flags on all */
1839 lsp_set_all_srmflags(lsp
);
1840 /* 7.3.16.4 b) retain only the header
1842 /* 7.3.16.4 c) record the time to purge
1844 /* run/schedule spf */
1845 /* isis_spf_schedule is called inside
1846 * lsp_destroy() below;
1847 * so it is not needed here. */
1848 /* isis_spf_schedule (lsp->area,
1852 if (lsp
->age_out
== 0) {
1854 "ISIS-Upd (%s): L%u LSP %s seq "
1855 "0x%08" PRIx32
" aged out",
1856 area
->area_tag
, lsp
->level
,
1857 rawlspid_print(lsp
->hdr
.lsp_id
),
1861 dict_delete_free(area
->lspdb
[level
],
1863 } else if (flags_any_set(lsp
->SRMflags
))
1864 listnode_add(lsp_list
, lsp
);
1868 * Send LSPs on circuits indicated by the SRMflags
1870 if (listcount(lsp_list
) > 0) {
1871 for (ALL_LIST_ELEMENTS_RO(area
->circuit_list
,
1873 if (!circuit
->lsp_queue
)
1876 if (now
- circuit
->lsp_queue_last_push
[level
]
1877 < MIN_LSP_RETRANS_INTERVAL
) {
1881 circuit
->lsp_queue_last_push
[level
] = now
;
1883 for (ALL_LIST_ELEMENTS_RO(
1884 lsp_list
, lspnode
, lsp
)) {
1885 if (circuit
->upadjcount
1890 isis_circuit_queue_lsp(circuit
, lsp
);
1894 list_delete_all_node(lsp_list
);
1899 list_delete_and_null(&lsp_list
);
1904 void lsp_purge_pseudo(u_char
*id
, struct isis_circuit
*circuit
, int level
)
1906 struct isis_lsp
*lsp
;
1908 lsp
= lsp_search(id
, circuit
->area
->lspdb
[level
- 1]);
1912 lsp_purge(lsp
, level
);
1916 * Purge own LSP that is received and we don't have.
1917 * -> Do as in 7.3.16.4
1919 void lsp_purge_non_exist(int level
, struct isis_lsp_hdr
*hdr
,
1920 struct isis_area
*area
)
1922 struct isis_lsp
*lsp
;
1925 * We need to create the LSP to be purged
1927 lsp
= XCALLOC(MTYPE_ISIS_LSP
, sizeof(struct isis_lsp
));
1930 lsp
->pdu
= stream_new(LLC_LEN
+ area
->lsp_mtu
);
1931 lsp
->age_out
= ZERO_AGE_LIFETIME
;
1933 memcpy(&lsp
->hdr
, hdr
, sizeof(lsp
->hdr
));
1934 lsp
->hdr
.rem_lifetime
= 0;
1938 lsp_insert(lsp
, area
->lspdb
[lsp
->level
- 1]);
1939 lsp_set_all_srmflags(lsp
);
1944 void lsp_set_all_srmflags(struct isis_lsp
*lsp
)
1946 struct listnode
*node
;
1947 struct isis_circuit
*circuit
;
1951 ISIS_FLAGS_CLEAR_ALL(lsp
->SRMflags
);
1954 struct list
*circuit_list
= lsp
->area
->circuit_list
;
1955 for (ALL_LIST_ELEMENTS_RO(circuit_list
, node
, circuit
)) {
1956 ISIS_SET_FLAG(lsp
->SRMflags
, circuit
);