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1 | /* | |
2 | * IS-IS Rout(e)ing protocol - isis_lsp.c | |
3 | * LSP processing | |
4 | * | |
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> | |
9 | * | |
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) | |
13 | * any later version. | |
14 | * | |
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 | |
18 | * more details. | |
19 | * | |
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 | |
23 | */ | |
24 | ||
25 | #include <zebra.h> | |
26 | ||
27 | #include "linklist.h" | |
28 | #include "thread.h" | |
29 | #include "vty.h" | |
30 | #include "stream.h" | |
31 | #include "memory.h" | |
32 | #include "log.h" | |
33 | #include "prefix.h" | |
34 | #include "command.h" | |
35 | #include "hash.h" | |
36 | #include "if.h" | |
37 | #include "checksum.h" | |
38 | #include "md5.h" | |
39 | #include "table.h" | |
40 | #include "srcdest_table.h" | |
41 | #include "lib_errors.h" | |
42 | ||
43 | #include "isisd/isis_constants.h" | |
44 | #include "isisd/isis_common.h" | |
45 | #include "isisd/isis_flags.h" | |
46 | #include "isisd/isis_circuit.h" | |
47 | #include "isisd/isisd.h" | |
48 | #include "isisd/isis_lsp.h" | |
49 | #include "isisd/isis_pdu.h" | |
50 | #include "isisd/isis_dynhn.h" | |
51 | #include "isisd/isis_misc.h" | |
52 | #include "isisd/isis_csm.h" | |
53 | #include "isisd/isis_adjacency.h" | |
54 | #include "isisd/isis_spf.h" | |
55 | #include "isisd/isis_te.h" | |
56 | #include "isisd/isis_mt.h" | |
57 | #include "isisd/isis_tlvs.h" | |
58 | #include "isisd/fabricd.h" | |
59 | #include "isisd/isis_tx_queue.h" | |
60 | ||
61 | static int lsp_refresh(struct thread *thread); | |
62 | static int lsp_l1_refresh_pseudo(struct thread *thread); | |
63 | static int lsp_l2_refresh_pseudo(struct thread *thread); | |
64 | ||
65 | static void lsp_destroy(struct isis_lsp *lsp); | |
66 | ||
67 | int lsp_id_cmp(uint8_t *id1, uint8_t *id2) | |
68 | { | |
69 | return memcmp(id1, id2, ISIS_SYS_ID_LEN + 2); | |
70 | } | |
71 | ||
72 | int lspdb_compare(const struct isis_lsp *a, const struct isis_lsp *b) | |
73 | { | |
74 | return memcmp(a->hdr.lsp_id, b->hdr.lsp_id, sizeof(a->hdr.lsp_id)); | |
75 | } | |
76 | ||
77 | void lsp_db_init(struct lspdb_head *head) | |
78 | { | |
79 | lspdb_init(head); | |
80 | } | |
81 | ||
82 | void lsp_db_fini(struct lspdb_head *head) | |
83 | { | |
84 | struct isis_lsp *lsp; | |
85 | ||
86 | while ((lsp = lspdb_pop(head))) | |
87 | lsp_destroy(lsp); | |
88 | lspdb_fini(head); | |
89 | } | |
90 | ||
91 | struct isis_lsp *lsp_search(struct lspdb_head *head, const uint8_t *id) | |
92 | { | |
93 | struct isis_lsp searchfor; | |
94 | memcpy(searchfor.hdr.lsp_id, id, sizeof(searchfor.hdr.lsp_id)); | |
95 | ||
96 | return lspdb_find(head, &searchfor); | |
97 | } | |
98 | ||
99 | static void lsp_clear_data(struct isis_lsp *lsp) | |
100 | { | |
101 | if (!lsp) | |
102 | return; | |
103 | ||
104 | isis_free_tlvs(lsp->tlvs); | |
105 | lsp->tlvs = NULL; | |
106 | } | |
107 | ||
108 | static void lsp_remove_frags(struct lspdb_head *head, struct list *frags); | |
109 | ||
110 | static void lsp_destroy(struct isis_lsp *lsp) | |
111 | { | |
112 | struct listnode *cnode; | |
113 | struct isis_circuit *circuit; | |
114 | ||
115 | if (!lsp) | |
116 | return; | |
117 | ||
118 | for (ALL_LIST_ELEMENTS_RO(lsp->area->circuit_list, cnode, circuit)) | |
119 | isis_tx_queue_del(circuit->tx_queue, lsp); | |
120 | ||
121 | ISIS_FLAGS_CLEAR_ALL(lsp->SSNflags); | |
122 | ||
123 | lsp_clear_data(lsp); | |
124 | ||
125 | if (!LSP_FRAGMENT(lsp->hdr.lsp_id)) { | |
126 | if (lsp->lspu.frags) { | |
127 | lsp_remove_frags(&lsp->area->lspdb[lsp->level - 1], | |
128 | lsp->lspu.frags); | |
129 | list_delete(&lsp->lspu.frags); | |
130 | } | |
131 | } else { | |
132 | if (lsp->lspu.zero_lsp | |
133 | && lsp->lspu.zero_lsp->lspu.frags) { | |
134 | listnode_delete(lsp->lspu.zero_lsp->lspu.frags, lsp); | |
135 | } | |
136 | } | |
137 | ||
138 | isis_spf_schedule(lsp->area, lsp->level); | |
139 | ||
140 | if (lsp->pdu) | |
141 | stream_free(lsp->pdu); | |
142 | ||
143 | fabricd_lsp_free(lsp); | |
144 | XFREE(MTYPE_ISIS_LSP, lsp); | |
145 | } | |
146 | ||
147 | /* | |
148 | * Remove all the frags belonging to the given lsp | |
149 | */ | |
150 | static void lsp_remove_frags(struct lspdb_head *head, struct list *frags) | |
151 | { | |
152 | struct listnode *lnode, *lnnode; | |
153 | struct isis_lsp *lsp; | |
154 | ||
155 | for (ALL_LIST_ELEMENTS(frags, lnode, lnnode, lsp)) { | |
156 | lsp = lsp_search(head, lsp->hdr.lsp_id); | |
157 | lspdb_del(head, lsp); | |
158 | lsp_destroy(lsp); | |
159 | } | |
160 | } | |
161 | ||
162 | void lsp_search_and_destroy(struct lspdb_head *head, const uint8_t *id) | |
163 | { | |
164 | struct isis_lsp *lsp; | |
165 | ||
166 | lsp = lsp_search(head, id); | |
167 | if (lsp) { | |
168 | lspdb_del(head, lsp); | |
169 | /* | |
170 | * If this is a zero lsp, remove all the frags now | |
171 | */ | |
172 | if (LSP_FRAGMENT(lsp->hdr.lsp_id) == 0) { | |
173 | if (lsp->lspu.frags) | |
174 | lsp_remove_frags(head, lsp->lspu.frags); | |
175 | } else { | |
176 | /* | |
177 | * else just remove this frag, from the zero lsps' frag | |
178 | * list | |
179 | */ | |
180 | if (lsp->lspu.zero_lsp | |
181 | && lsp->lspu.zero_lsp->lspu.frags) | |
182 | listnode_delete(lsp->lspu.zero_lsp->lspu.frags, | |
183 | lsp); | |
184 | } | |
185 | lsp_destroy(lsp); | |
186 | } | |
187 | } | |
188 | ||
189 | /* | |
190 | * Compares a LSP to given values | |
191 | * Params are given in net order | |
192 | */ | |
193 | int lsp_compare(char *areatag, struct isis_lsp *lsp, uint32_t seqno, | |
194 | uint16_t checksum, uint16_t rem_lifetime) | |
195 | { | |
196 | if (lsp->hdr.seqno == seqno && lsp->hdr.checksum == checksum | |
197 | && ((lsp->hdr.rem_lifetime == 0 && rem_lifetime == 0) | |
198 | || (lsp->hdr.rem_lifetime != 0 && rem_lifetime != 0))) { | |
199 | if (isis->debugs & DEBUG_SNP_PACKETS) { | |
200 | zlog_debug( | |
201 | "ISIS-Snp (%s): Compare LSP %s seq 0x%08" PRIx32 | |
202 | ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16 | |
203 | "s", | |
204 | areatag, rawlspid_print(lsp->hdr.lsp_id), | |
205 | lsp->hdr.seqno, lsp->hdr.checksum, | |
206 | lsp->hdr.rem_lifetime); | |
207 | zlog_debug( | |
208 | "ISIS-Snp (%s): is equal to ours seq 0x%08" PRIx32 | |
209 | ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16 | |
210 | "s", | |
211 | areatag, seqno, checksum, rem_lifetime); | |
212 | } | |
213 | return LSP_EQUAL; | |
214 | } | |
215 | ||
216 | /* | |
217 | * LSPs with identical checksums should only be treated as newer if: | |
218 | * a) The current LSP has a remaining lifetime != 0 and the other LSP | |
219 | * has a | |
220 | * remaining lifetime == 0. In this case, we should participate in | |
221 | * the purge | |
222 | * and should not treat the current LSP with remaining lifetime == 0 | |
223 | * as older. | |
224 | * b) The LSP has an incorrect checksum. In this case, we need to react | |
225 | * as given | |
226 | * in 7.3.16.2. | |
227 | */ | |
228 | if (seqno > lsp->hdr.seqno | |
229 | || (seqno == lsp->hdr.seqno | |
230 | && ((lsp->hdr.rem_lifetime != 0 && rem_lifetime == 0) | |
231 | || (lsp->hdr.checksum != checksum | |
232 | && lsp->hdr.rem_lifetime)))) { | |
233 | if (isis->debugs & DEBUG_SNP_PACKETS) { | |
234 | zlog_debug( | |
235 | "ISIS-Snp (%s): Compare LSP %s seq 0x%08" PRIx32 | |
236 | ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16 | |
237 | "s", | |
238 | areatag, rawlspid_print(lsp->hdr.lsp_id), seqno, | |
239 | checksum, rem_lifetime); | |
240 | zlog_debug( | |
241 | "ISIS-Snp (%s): is newer than ours seq 0x%08" PRIx32 | |
242 | ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16 | |
243 | "s", | |
244 | areatag, lsp->hdr.seqno, lsp->hdr.checksum, | |
245 | lsp->hdr.rem_lifetime); | |
246 | } | |
247 | return LSP_NEWER; | |
248 | } | |
249 | if (isis->debugs & DEBUG_SNP_PACKETS) { | |
250 | zlog_debug("ISIS-Snp (%s): Compare LSP %s seq 0x%08" PRIx32 | |
251 | ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16 "s", | |
252 | areatag, rawlspid_print(lsp->hdr.lsp_id), seqno, | |
253 | checksum, rem_lifetime); | |
254 | zlog_debug( | |
255 | "ISIS-Snp (%s): is older than ours seq 0x%08" PRIx32 | |
256 | ", cksum 0x%04" PRIx16 ", lifetime %" PRIu16 "s", | |
257 | areatag, lsp->hdr.seqno, lsp->hdr.checksum, | |
258 | lsp->hdr.rem_lifetime); | |
259 | } | |
260 | ||
261 | return LSP_OLDER; | |
262 | } | |
263 | ||
264 | static void put_lsp_hdr(struct isis_lsp *lsp, size_t *len_pointer, bool keep) | |
265 | { | |
266 | uint8_t pdu_type = | |
267 | (lsp->level == IS_LEVEL_1) ? L1_LINK_STATE : L2_LINK_STATE; | |
268 | struct isis_lsp_hdr *hdr = &lsp->hdr; | |
269 | struct stream *stream = lsp->pdu; | |
270 | size_t orig_getp = 0, orig_endp = 0; | |
271 | ||
272 | if (keep) { | |
273 | orig_getp = stream_get_getp(lsp->pdu); | |
274 | orig_endp = stream_get_endp(lsp->pdu); | |
275 | } | |
276 | ||
277 | stream_set_getp(lsp->pdu, 0); | |
278 | stream_set_endp(lsp->pdu, 0); | |
279 | ||
280 | fill_fixed_hdr(pdu_type, stream); | |
281 | ||
282 | if (len_pointer) | |
283 | *len_pointer = stream_get_endp(stream); | |
284 | stream_putw(stream, hdr->pdu_len); | |
285 | stream_putw(stream, hdr->rem_lifetime); | |
286 | stream_put(stream, hdr->lsp_id, sizeof(hdr->lsp_id)); | |
287 | stream_putl(stream, hdr->seqno); | |
288 | stream_putw(stream, hdr->checksum); | |
289 | stream_putc(stream, hdr->lsp_bits); | |
290 | ||
291 | if (keep) { | |
292 | stream_set_endp(lsp->pdu, orig_endp); | |
293 | stream_set_getp(lsp->pdu, orig_getp); | |
294 | } | |
295 | } | |
296 | ||
297 | static void lsp_add_auth(struct isis_lsp *lsp) | |
298 | { | |
299 | struct isis_passwd *passwd; | |
300 | passwd = (lsp->level == IS_LEVEL_1) ? &lsp->area->area_passwd | |
301 | : &lsp->area->domain_passwd; | |
302 | isis_tlvs_add_auth(lsp->tlvs, passwd); | |
303 | } | |
304 | ||
305 | static void lsp_pack_pdu(struct isis_lsp *lsp) | |
306 | { | |
307 | if (!lsp->tlvs) | |
308 | lsp->tlvs = isis_alloc_tlvs(); | |
309 | ||
310 | lsp_add_auth(lsp); | |
311 | ||
312 | size_t len_pointer; | |
313 | put_lsp_hdr(lsp, &len_pointer, false); | |
314 | isis_pack_tlvs(lsp->tlvs, lsp->pdu, len_pointer, false, true); | |
315 | ||
316 | lsp->hdr.pdu_len = stream_get_endp(lsp->pdu); | |
317 | lsp->hdr.checksum = | |
318 | ntohs(fletcher_checksum(STREAM_DATA(lsp->pdu) + 12, | |
319 | stream_get_endp(lsp->pdu) - 12, 12)); | |
320 | } | |
321 | ||
322 | void lsp_inc_seqno(struct isis_lsp *lsp, uint32_t seqno) | |
323 | { | |
324 | uint32_t newseq; | |
325 | ||
326 | if (seqno == 0 || lsp->hdr.seqno > seqno) | |
327 | newseq = lsp->hdr.seqno + 1; | |
328 | else | |
329 | newseq = seqno + 1; | |
330 | ||
331 | #ifndef FABRICD | |
332 | /* check for overflow */ | |
333 | if (newseq < lsp->hdr.seqno) { | |
334 | /* send northbound notification */ | |
335 | isis_notif_lsp_exceed_max(lsp->area, | |
336 | rawlspid_print(lsp->hdr.lsp_id)); | |
337 | } | |
338 | #endif /* ifndef FABRICD */ | |
339 | ||
340 | lsp->hdr.seqno = newseq; | |
341 | ||
342 | lsp_pack_pdu(lsp); | |
343 | isis_spf_schedule(lsp->area, lsp->level); | |
344 | } | |
345 | ||
346 | static void lsp_purge_add_poi(struct isis_lsp *lsp, | |
347 | const uint8_t *sender) | |
348 | { | |
349 | if (!lsp->area->purge_originator) | |
350 | return; | |
351 | ||
352 | /* add purge originator identification */ | |
353 | if (!lsp->tlvs) | |
354 | lsp->tlvs = isis_alloc_tlvs(); | |
355 | isis_tlvs_set_purge_originator(lsp->tlvs, isis->sysid, sender); | |
356 | isis_tlvs_set_dynamic_hostname(lsp->tlvs, cmd_hostname_get()); | |
357 | } | |
358 | ||
359 | static void lsp_purge(struct isis_lsp *lsp, int level, | |
360 | const uint8_t *sender) | |
361 | { | |
362 | /* reset stream */ | |
363 | lsp_clear_data(lsp); | |
364 | stream_reset(lsp->pdu); | |
365 | ||
366 | /* update header */ | |
367 | lsp->hdr.checksum = 0; | |
368 | lsp->hdr.rem_lifetime = 0; | |
369 | lsp->level = level; | |
370 | lsp->age_out = lsp->area->max_lsp_lifetime[level - 1]; | |
371 | lsp->area->lsp_purge_count[level - 1]++; | |
372 | ||
373 | lsp_purge_add_poi(lsp, sender); | |
374 | ||
375 | lsp_pack_pdu(lsp); | |
376 | lsp_flood(lsp, NULL); | |
377 | } | |
378 | ||
379 | /* | |
380 | * Generates checksum for LSP and its frags | |
381 | */ | |
382 | static void lsp_seqno_update(struct isis_lsp *lsp0) | |
383 | { | |
384 | struct isis_lsp *lsp; | |
385 | struct listnode *node; | |
386 | ||
387 | lsp_inc_seqno(lsp0, 0); | |
388 | ||
389 | if (!lsp0->lspu.frags) | |
390 | return; | |
391 | ||
392 | for (ALL_LIST_ELEMENTS_RO(lsp0->lspu.frags, node, lsp)) { | |
393 | if (lsp->tlvs) | |
394 | lsp_inc_seqno(lsp, 0); | |
395 | else if (lsp->hdr.rem_lifetime) { | |
396 | /* Purge should only be applied when the fragment has | |
397 | * non-zero remaining lifetime. | |
398 | */ | |
399 | lsp_purge(lsp, lsp0->level, NULL); | |
400 | } | |
401 | } | |
402 | ||
403 | return; | |
404 | } | |
405 | ||
406 | static uint8_t lsp_bits_generate(int level, int overload_bit, int attached_bit) | |
407 | { | |
408 | uint8_t lsp_bits = 0; | |
409 | if (level == IS_LEVEL_1) | |
410 | lsp_bits = IS_LEVEL_1; | |
411 | else | |
412 | lsp_bits = IS_LEVEL_1_AND_2; | |
413 | if (overload_bit) | |
414 | lsp_bits |= overload_bit; | |
415 | if (attached_bit) | |
416 | lsp_bits |= attached_bit; | |
417 | return lsp_bits; | |
418 | } | |
419 | ||
420 | static void lsp_update_data(struct isis_lsp *lsp, struct isis_lsp_hdr *hdr, | |
421 | struct isis_tlvs *tlvs, struct stream *stream, | |
422 | struct isis_area *area, int level) | |
423 | { | |
424 | /* free the old lsp data */ | |
425 | lsp_clear_data(lsp); | |
426 | ||
427 | /* copying only the relevant part of our stream */ | |
428 | if (lsp->pdu != NULL) | |
429 | stream_free(lsp->pdu); | |
430 | lsp->pdu = stream_dup(stream); | |
431 | ||
432 | memcpy(&lsp->hdr, hdr, sizeof(lsp->hdr)); | |
433 | lsp->area = area; | |
434 | lsp->level = level; | |
435 | lsp->age_out = ZERO_AGE_LIFETIME; | |
436 | lsp->installed = time(NULL); | |
437 | ||
438 | lsp->tlvs = tlvs; | |
439 | ||
440 | if (area->dynhostname && lsp->tlvs->hostname | |
441 | && lsp->hdr.rem_lifetime) { | |
442 | isis_dynhn_insert(lsp->hdr.lsp_id, lsp->tlvs->hostname, | |
443 | (lsp->hdr.lsp_bits & LSPBIT_IST) | |
444 | == IS_LEVEL_1_AND_2 | |
445 | ? IS_LEVEL_2 | |
446 | : IS_LEVEL_1); | |
447 | } | |
448 | ||
449 | return; | |
450 | } | |
451 | ||
452 | static void lsp_link_fragment(struct isis_lsp *lsp, struct isis_lsp *lsp0) | |
453 | { | |
454 | if (!LSP_FRAGMENT(lsp->hdr.lsp_id)) { | |
455 | /* zero lsp -> create list to store fragments */ | |
456 | lsp->lspu.frags = list_new(); | |
457 | } else { | |
458 | /* fragment -> set backpointer and add to zero lsps list */ | |
459 | assert(lsp0); | |
460 | lsp->lspu.zero_lsp = lsp0; | |
461 | listnode_add(lsp0->lspu.frags, lsp); | |
462 | } | |
463 | } | |
464 | ||
465 | void lsp_update(struct isis_lsp *lsp, struct isis_lsp_hdr *hdr, | |
466 | struct isis_tlvs *tlvs, struct stream *stream, | |
467 | struct isis_area *area, int level, bool confusion) | |
468 | { | |
469 | if (lsp->own_lsp) { | |
470 | flog_err( | |
471 | EC_LIB_DEVELOPMENT, | |
472 | "ISIS-Upd (%s): BUG updating LSP %s still marked as own LSP", | |
473 | area->area_tag, rawlspid_print(lsp->hdr.lsp_id)); | |
474 | lsp_clear_data(lsp); | |
475 | lsp->own_lsp = 0; | |
476 | } | |
477 | ||
478 | if (confusion) { | |
479 | lsp_purge(lsp, level, NULL); | |
480 | } else { | |
481 | lsp_update_data(lsp, hdr, tlvs, stream, area, level); | |
482 | } | |
483 | ||
484 | if (LSP_FRAGMENT(lsp->hdr.lsp_id) && !lsp->lspu.zero_lsp) { | |
485 | uint8_t lspid[ISIS_SYS_ID_LEN + 2]; | |
486 | struct isis_lsp *lsp0; | |
487 | ||
488 | memcpy(lspid, lsp->hdr.lsp_id, ISIS_SYS_ID_LEN + 1); | |
489 | LSP_FRAGMENT(lspid) = 0; | |
490 | lsp0 = lsp_search(&area->lspdb[level - 1], lspid); | |
491 | if (lsp0) | |
492 | lsp_link_fragment(lsp, lsp0); | |
493 | } | |
494 | ||
495 | if (lsp->hdr.seqno) | |
496 | isis_spf_schedule(lsp->area, lsp->level); | |
497 | } | |
498 | ||
499 | /* creation of LSP directly from what we received */ | |
500 | struct isis_lsp *lsp_new_from_recv(struct isis_lsp_hdr *hdr, | |
501 | struct isis_tlvs *tlvs, | |
502 | struct stream *stream, struct isis_lsp *lsp0, | |
503 | struct isis_area *area, int level) | |
504 | { | |
505 | struct isis_lsp *lsp; | |
506 | ||
507 | lsp = XCALLOC(MTYPE_ISIS_LSP, sizeof(struct isis_lsp)); | |
508 | lsp_update_data(lsp, hdr, tlvs, stream, area, level); | |
509 | lsp_link_fragment(lsp, lsp0); | |
510 | ||
511 | return lsp; | |
512 | } | |
513 | ||
514 | static void lsp_adjust_stream(struct isis_lsp *lsp) | |
515 | { | |
516 | if (lsp->pdu) { | |
517 | if (STREAM_SIZE(lsp->pdu) == LLC_LEN + lsp->area->lsp_mtu) | |
518 | return; | |
519 | stream_free(lsp->pdu); | |
520 | } | |
521 | ||
522 | lsp->pdu = stream_new(LLC_LEN + lsp->area->lsp_mtu); | |
523 | } | |
524 | ||
525 | struct isis_lsp *lsp_new(struct isis_area *area, uint8_t *lsp_id, | |
526 | uint16_t rem_lifetime, uint32_t seqno, | |
527 | uint8_t lsp_bits, uint16_t checksum, | |
528 | struct isis_lsp *lsp0, int level) | |
529 | { | |
530 | struct isis_lsp *lsp; | |
531 | ||
532 | lsp = XCALLOC(MTYPE_ISIS_LSP, sizeof(struct isis_lsp)); | |
533 | lsp->area = area; | |
534 | ||
535 | lsp_adjust_stream(lsp); | |
536 | ||
537 | /* Minimal LSP PDU size */ | |
538 | lsp->hdr.pdu_len = ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN; | |
539 | memcpy(lsp->hdr.lsp_id, lsp_id, sizeof(lsp->hdr.lsp_id)); | |
540 | lsp->hdr.checksum = checksum; | |
541 | lsp->hdr.seqno = seqno; | |
542 | lsp->hdr.rem_lifetime = rem_lifetime; | |
543 | lsp->hdr.lsp_bits = lsp_bits; | |
544 | lsp->level = level; | |
545 | lsp->age_out = ZERO_AGE_LIFETIME; | |
546 | lsp_link_fragment(lsp, lsp0); | |
547 | put_lsp_hdr(lsp, NULL, false); | |
548 | ||
549 | if (isis->debugs & DEBUG_EVENTS) | |
550 | zlog_debug("New LSP with ID %s-%02x-%02x len %d seqnum %08x", | |
551 | sysid_print(lsp_id), LSP_PSEUDO_ID(lsp->hdr.lsp_id), | |
552 | LSP_FRAGMENT(lsp->hdr.lsp_id), lsp->hdr.pdu_len, | |
553 | lsp->hdr.seqno); | |
554 | ||
555 | return lsp; | |
556 | } | |
557 | ||
558 | void lsp_insert(struct lspdb_head *head, struct isis_lsp *lsp) | |
559 | { | |
560 | lspdb_add(head, lsp); | |
561 | if (lsp->hdr.seqno) | |
562 | isis_spf_schedule(lsp->area, lsp->level); | |
563 | } | |
564 | ||
565 | /* | |
566 | * Build a list of LSPs with non-zero ht bounded by start and stop ids | |
567 | */ | |
568 | void lsp_build_list_nonzero_ht(struct lspdb_head *head, const uint8_t *start_id, | |
569 | const uint8_t *stop_id, struct list *list) | |
570 | { | |
571 | struct isis_lsp searchfor; | |
572 | struct isis_lsp *lsp, *start; | |
573 | ||
574 | memcpy(&searchfor.hdr.lsp_id, start_id, sizeof(searchfor.hdr.lsp_id)); | |
575 | ||
576 | start = lspdb_find_gteq(head, &searchfor); | |
577 | frr_each_from (lspdb, head, lsp, start) { | |
578 | if (memcmp(lsp->hdr.lsp_id, stop_id, | |
579 | ISIS_SYS_ID_LEN + 2) > 0) | |
580 | break; | |
581 | ||
582 | if (lsp->hdr.rem_lifetime) | |
583 | listnode_add(list, lsp); | |
584 | } | |
585 | } | |
586 | ||
587 | static void lsp_set_time(struct isis_lsp *lsp) | |
588 | { | |
589 | assert(lsp); | |
590 | ||
591 | if (lsp->hdr.rem_lifetime == 0) { | |
592 | if (lsp->age_out > 0) | |
593 | lsp->age_out--; | |
594 | return; | |
595 | } | |
596 | ||
597 | lsp->hdr.rem_lifetime--; | |
598 | if (lsp->pdu && stream_get_endp(lsp->pdu) >= 12) | |
599 | stream_putw_at(lsp->pdu, 10, lsp->hdr.rem_lifetime); | |
600 | } | |
601 | ||
602 | void lspid_print(uint8_t *lsp_id, char *dest, char dynhost, char frag) | |
603 | { | |
604 | struct isis_dynhn *dyn = NULL; | |
605 | uint8_t id[SYSID_STRLEN]; | |
606 | ||
607 | if (dynhost) | |
608 | dyn = dynhn_find_by_id(lsp_id); | |
609 | else | |
610 | dyn = NULL; | |
611 | ||
612 | if (dyn) | |
613 | sprintf((char *)id, "%.14s", dyn->hostname); | |
614 | else if (!memcmp(isis->sysid, lsp_id, ISIS_SYS_ID_LEN) && dynhost) | |
615 | sprintf((char *)id, "%.14s", cmd_hostname_get()); | |
616 | else | |
617 | memcpy(id, sysid_print(lsp_id), 15); | |
618 | if (frag) | |
619 | sprintf(dest, "%s.%02x-%02x", id, LSP_PSEUDO_ID(lsp_id), | |
620 | LSP_FRAGMENT(lsp_id)); | |
621 | else | |
622 | sprintf(dest, "%s.%02x", id, LSP_PSEUDO_ID(lsp_id)); | |
623 | } | |
624 | ||
625 | /* Convert the lsp attribute bits to attribute string */ | |
626 | static const char *lsp_bits2string(uint8_t lsp_bits, char *buf, size_t buf_size) | |
627 | { | |
628 | char *pos = buf; | |
629 | ||
630 | if (!lsp_bits) | |
631 | return " none"; | |
632 | ||
633 | if (buf_size < 2 * 3) | |
634 | return " error"; | |
635 | ||
636 | /* we only focus on the default metric */ | |
637 | pos += sprintf(pos, "%d/", | |
638 | ISIS_MASK_LSP_ATT_DEFAULT_BIT(lsp_bits) ? 1 : 0); | |
639 | ||
640 | pos += sprintf(pos, "%d/", | |
641 | ISIS_MASK_LSP_PARTITION_BIT(lsp_bits) ? 1 : 0); | |
642 | ||
643 | sprintf(pos, "%d", ISIS_MASK_LSP_OL_BIT(lsp_bits) ? 1 : 0); | |
644 | ||
645 | return buf; | |
646 | } | |
647 | ||
648 | /* this function prints the lsp on show isis database */ | |
649 | void lsp_print(struct isis_lsp *lsp, struct vty *vty, char dynhost) | |
650 | { | |
651 | char LSPid[255]; | |
652 | char age_out[8]; | |
653 | char b[200]; | |
654 | ||
655 | lspid_print(lsp->hdr.lsp_id, LSPid, dynhost, 1); | |
656 | vty_out(vty, "%-21s%c ", LSPid, lsp->own_lsp ? '*' : ' '); | |
657 | vty_out(vty, "%5" PRIu16 " ", lsp->hdr.pdu_len); | |
658 | vty_out(vty, "0x%08" PRIx32 " ", lsp->hdr.seqno); | |
659 | vty_out(vty, "0x%04" PRIx16 " ", lsp->hdr.checksum); | |
660 | if (lsp->hdr.rem_lifetime == 0) { | |
661 | snprintf(age_out, 8, "(%d)", lsp->age_out); | |
662 | age_out[7] = '\0'; | |
663 | vty_out(vty, "%7s ", age_out); | |
664 | } else | |
665 | vty_out(vty, " %5" PRIu16 " ", lsp->hdr.rem_lifetime); | |
666 | vty_out(vty, "%s\n", lsp_bits2string(lsp->hdr.lsp_bits, b, sizeof(b))); | |
667 | } | |
668 | ||
669 | void lsp_print_detail(struct isis_lsp *lsp, struct vty *vty, char dynhost) | |
670 | { | |
671 | lsp_print(lsp, vty, dynhost); | |
672 | if (lsp->tlvs) | |
673 | vty_multiline(vty, " ", "%s", isis_format_tlvs(lsp->tlvs)); | |
674 | vty_out(vty, "\n"); | |
675 | } | |
676 | ||
677 | /* print all the lsps info in the local lspdb */ | |
678 | int lsp_print_all(struct vty *vty, struct lspdb_head *head, char detail, | |
679 | char dynhost) | |
680 | { | |
681 | struct isis_lsp *lsp; | |
682 | int lsp_count = 0; | |
683 | ||
684 | if (detail == ISIS_UI_LEVEL_BRIEF) { | |
685 | frr_each (lspdb, head, lsp) { | |
686 | lsp_print(lsp, vty, dynhost); | |
687 | lsp_count++; | |
688 | } | |
689 | } else if (detail == ISIS_UI_LEVEL_DETAIL) { | |
690 | frr_each (lspdb, head, lsp) { | |
691 | lsp_print_detail(lsp, vty, dynhost); | |
692 | lsp_count++; | |
693 | } | |
694 | } | |
695 | ||
696 | return lsp_count; | |
697 | } | |
698 | ||
699 | static uint16_t lsp_rem_lifetime(struct isis_area *area, int level) | |
700 | { | |
701 | uint16_t rem_lifetime; | |
702 | ||
703 | /* Add jitter to configured LSP lifetime */ | |
704 | rem_lifetime = | |
705 | isis_jitter(area->max_lsp_lifetime[level - 1], MAX_AGE_JITTER); | |
706 | ||
707 | /* No jitter if the max refresh will be less than configure gen interval | |
708 | */ | |
709 | /* N.B. this calucation is acceptable since rem_lifetime is in | |
710 | * [332,65535] at | |
711 | * this point */ | |
712 | if (area->lsp_gen_interval[level - 1] > (rem_lifetime - 300)) | |
713 | rem_lifetime = area->max_lsp_lifetime[level - 1]; | |
714 | ||
715 | return rem_lifetime; | |
716 | } | |
717 | ||
718 | static uint16_t lsp_refresh_time(struct isis_lsp *lsp, uint16_t rem_lifetime) | |
719 | { | |
720 | struct isis_area *area = lsp->area; | |
721 | int level = lsp->level; | |
722 | uint16_t refresh_time; | |
723 | ||
724 | /* Add jitter to LSP refresh time */ | |
725 | refresh_time = | |
726 | isis_jitter(area->lsp_refresh[level - 1], MAX_LSP_GEN_JITTER); | |
727 | ||
728 | /* RFC 4444 : make sure the refresh time is at least less than 300 | |
729 | * of the remaining lifetime and more than gen interval */ | |
730 | if (refresh_time <= area->lsp_gen_interval[level - 1] | |
731 | || refresh_time > (rem_lifetime - 300)) | |
732 | refresh_time = rem_lifetime - 300; | |
733 | ||
734 | /* In cornercases, refresh_time might be <= lsp_gen_interval, however | |
735 | * we accept this violation to satisfy refresh_time <= rem_lifetime - | |
736 | * 300 */ | |
737 | ||
738 | return refresh_time; | |
739 | } | |
740 | ||
741 | static void lsp_build_ext_reach_ipv4(struct isis_lsp *lsp, | |
742 | struct isis_area *area) | |
743 | { | |
744 | struct route_table *er_table = get_ext_reach(area, AF_INET, lsp->level); | |
745 | if (!er_table) | |
746 | return; | |
747 | ||
748 | for (struct route_node *rn = route_top(er_table); rn; | |
749 | rn = route_next(rn)) { | |
750 | if (!rn->info) | |
751 | continue; | |
752 | ||
753 | struct prefix_ipv4 *ipv4 = (struct prefix_ipv4 *)&rn->p; | |
754 | struct isis_ext_info *info = rn->info; | |
755 | ||
756 | uint32_t metric = info->metric; | |
757 | if (metric > MAX_WIDE_PATH_METRIC) | |
758 | metric = MAX_WIDE_PATH_METRIC; | |
759 | if (area->oldmetric && metric > 0x3f) | |
760 | metric = 0x3f; | |
761 | ||
762 | if (area->oldmetric) | |
763 | isis_tlvs_add_oldstyle_ip_reach(lsp->tlvs, ipv4, | |
764 | metric); | |
765 | if (area->newmetric) | |
766 | isis_tlvs_add_extended_ip_reach(lsp->tlvs, ipv4, | |
767 | metric); | |
768 | } | |
769 | } | |
770 | ||
771 | static void lsp_build_ext_reach_ipv6(struct isis_lsp *lsp, | |
772 | struct isis_area *area) | |
773 | { | |
774 | struct route_table *er_table = | |
775 | get_ext_reach(area, AF_INET6, lsp->level); | |
776 | if (!er_table) | |
777 | return; | |
778 | ||
779 | for (struct route_node *rn = route_top(er_table); rn; | |
780 | rn = srcdest_route_next(rn)) { | |
781 | if (!rn->info) | |
782 | continue; | |
783 | struct isis_ext_info *info = rn->info; | |
784 | ||
785 | struct prefix_ipv6 *p, *src_p; | |
786 | srcdest_rnode_prefixes(rn, (const struct prefix **)&p, | |
787 | (const struct prefix **)&src_p); | |
788 | ||
789 | uint32_t metric = info->metric; | |
790 | if (info->metric > MAX_WIDE_PATH_METRIC) | |
791 | metric = MAX_WIDE_PATH_METRIC; | |
792 | ||
793 | if (!src_p || !src_p->prefixlen) { | |
794 | isis_tlvs_add_ipv6_reach(lsp->tlvs, | |
795 | isis_area_ipv6_topology(area), | |
796 | p, metric); | |
797 | } else if (isis_area_ipv6_dstsrc_enabled(area)) { | |
798 | isis_tlvs_add_ipv6_dstsrc_reach(lsp->tlvs, | |
799 | ISIS_MT_IPV6_DSTSRC, | |
800 | p, src_p, metric); | |
801 | } | |
802 | } | |
803 | } | |
804 | ||
805 | static void lsp_build_ext_reach(struct isis_lsp *lsp, struct isis_area *area) | |
806 | { | |
807 | lsp_build_ext_reach_ipv4(lsp, area); | |
808 | lsp_build_ext_reach_ipv6(lsp, area); | |
809 | } | |
810 | ||
811 | static struct isis_lsp *lsp_next_frag(uint8_t frag_num, struct isis_lsp *lsp0, | |
812 | struct isis_area *area, int level) | |
813 | { | |
814 | struct isis_lsp *lsp; | |
815 | uint8_t frag_id[ISIS_SYS_ID_LEN + 2]; | |
816 | ||
817 | memcpy(frag_id, lsp0->hdr.lsp_id, ISIS_SYS_ID_LEN + 1); | |
818 | LSP_FRAGMENT(frag_id) = frag_num; | |
819 | ||
820 | lsp = lsp_search(&area->lspdb[level - 1], frag_id); | |
821 | if (lsp) { | |
822 | lsp_clear_data(lsp); | |
823 | if (!lsp->lspu.zero_lsp) | |
824 | lsp_link_fragment(lsp, lsp0); | |
825 | return lsp; | |
826 | } | |
827 | ||
828 | lsp = lsp_new(area, frag_id, lsp0->hdr.rem_lifetime, 0, | |
829 | lsp_bits_generate(level, area->overload_bit, | |
830 | area->attached_bit), | |
831 | 0, lsp0, level); | |
832 | lsp->own_lsp = 1; | |
833 | lsp_insert(&area->lspdb[level - 1], lsp); | |
834 | return lsp; | |
835 | } | |
836 | ||
837 | /* | |
838 | * Builds the LSP data part. This func creates a new frag whenever | |
839 | * area->lsp_frag_threshold is exceeded. | |
840 | */ | |
841 | static void lsp_build(struct isis_lsp *lsp, struct isis_area *area) | |
842 | { | |
843 | int level = lsp->level; | |
844 | char buf[PREFIX2STR_BUFFER]; | |
845 | struct listnode *node; | |
846 | struct isis_lsp *frag; | |
847 | ||
848 | lsp_clear_data(lsp); | |
849 | for (ALL_LIST_ELEMENTS_RO(lsp->lspu.frags, node, frag)) | |
850 | lsp_clear_data(frag); | |
851 | ||
852 | lsp->tlvs = isis_alloc_tlvs(); | |
853 | lsp_debug("ISIS (%s): Constructing local system LSP for level %d", | |
854 | area->area_tag, level); | |
855 | ||
856 | lsp->hdr.lsp_bits = lsp_bits_generate(level, area->overload_bit, | |
857 | area->attached_bit); | |
858 | ||
859 | lsp_add_auth(lsp); | |
860 | ||
861 | isis_tlvs_add_area_addresses(lsp->tlvs, area->area_addrs); | |
862 | ||
863 | /* Protocols Supported */ | |
864 | if (area->ip_circuits > 0 || area->ipv6_circuits > 0) { | |
865 | struct nlpids nlpids = {.count = 0}; | |
866 | if (area->ip_circuits > 0) { | |
867 | lsp_debug( | |
868 | "ISIS (%s): Found IPv4 circuit, adding IPv4 to NLPIDs", | |
869 | area->area_tag); | |
870 | nlpids.nlpids[nlpids.count] = NLPID_IP; | |
871 | nlpids.count++; | |
872 | } | |
873 | if (area->ipv6_circuits > 0) { | |
874 | lsp_debug( | |
875 | "ISIS (%s): Found IPv6 circuit, adding IPv6 to NLPIDs", | |
876 | area->area_tag); | |
877 | nlpids.nlpids[nlpids.count] = NLPID_IPV6; | |
878 | nlpids.count++; | |
879 | } | |
880 | isis_tlvs_set_protocols_supported(lsp->tlvs, &nlpids); | |
881 | } | |
882 | ||
883 | if (area_is_mt(area)) { | |
884 | lsp_debug("ISIS (%s): Adding MT router tlv...", area->area_tag); | |
885 | ||
886 | struct isis_area_mt_setting **mt_settings; | |
887 | unsigned int mt_count; | |
888 | ||
889 | mt_settings = area_mt_settings(area, &mt_count); | |
890 | for (unsigned int i = 0; i < mt_count; i++) { | |
891 | isis_tlvs_add_mt_router_info( | |
892 | lsp->tlvs, mt_settings[i]->mtid, | |
893 | mt_settings[i]->overload, false); | |
894 | lsp_debug("ISIS (%s): MT %s", area->area_tag, | |
895 | isis_mtid2str(mt_settings[i]->mtid)); | |
896 | } | |
897 | } else { | |
898 | lsp_debug("ISIS (%s): Not adding MT router tlv (disabled)", | |
899 | area->area_tag); | |
900 | } | |
901 | /* Dynamic Hostname */ | |
902 | if (area->dynhostname) { | |
903 | isis_tlvs_set_dynamic_hostname(lsp->tlvs, cmd_hostname_get()); | |
904 | lsp_debug("ISIS (%s): Adding dynamic hostname '%s'", | |
905 | area->area_tag, cmd_hostname_get()); | |
906 | } else { | |
907 | lsp_debug("ISIS (%s): Not adding dynamic hostname (disabled)", | |
908 | area->area_tag); | |
909 | } | |
910 | ||
911 | /* IPv4 address and TE router ID TLVs. In case of the first one we don't | |
912 | * follow "C" vendor, but "J" vendor behavior - one IPv4 address is put | |
913 | * into | |
914 | * LSP and this address is same as router id. */ | |
915 | if (isis->router_id != 0) { | |
916 | struct in_addr id = {.s_addr = isis->router_id}; | |
917 | inet_ntop(AF_INET, &id, buf, sizeof(buf)); | |
918 | lsp_debug("ISIS (%s): Adding router ID %s as IPv4 tlv.", | |
919 | area->area_tag, buf); | |
920 | isis_tlvs_add_ipv4_address(lsp->tlvs, &id); | |
921 | ||
922 | /* Exactly same data is put into TE router ID TLV, but only if | |
923 | * new style | |
924 | * TLV's are in use. */ | |
925 | if (area->newmetric) { | |
926 | ||
927 | lsp_debug( | |
928 | "ISIS (%s): Adding router ID also as TE router ID tlv.", | |
929 | area->area_tag); | |
930 | isis_tlvs_set_te_router_id(lsp->tlvs, &id); | |
931 | } | |
932 | } else { | |
933 | lsp_debug("ISIS (%s): Router ID is unset. Not adding tlv.", | |
934 | area->area_tag); | |
935 | } | |
936 | ||
937 | lsp_debug("ISIS (%s): Adding circuit specific information.", | |
938 | area->area_tag); | |
939 | ||
940 | if (fabricd) { | |
941 | lsp_debug( | |
942 | "ISIS (%s): Adding tier %" PRIu8 " spine-leaf-extension tlv.", | |
943 | area->area_tag, fabricd_tier(area)); | |
944 | isis_tlvs_add_spine_leaf(lsp->tlvs, fabricd_tier(area), true, | |
945 | false, false, false); | |
946 | } | |
947 | ||
948 | struct isis_circuit *circuit; | |
949 | for (ALL_LIST_ELEMENTS_RO(area->circuit_list, node, circuit)) { | |
950 | if (!circuit->interface) | |
951 | lsp_debug( | |
952 | "ISIS (%s): Processing %s circuit %p with unknown interface", | |
953 | area->area_tag, | |
954 | circuit_type2string(circuit->circ_type), | |
955 | circuit); | |
956 | else | |
957 | lsp_debug("ISIS (%s): Processing %s circuit %s", | |
958 | area->area_tag, | |
959 | circuit_type2string(circuit->circ_type), | |
960 | circuit->interface->name); | |
961 | ||
962 | if (circuit->state != C_STATE_UP) { | |
963 | lsp_debug("ISIS (%s): Circuit is not up, ignoring.", | |
964 | area->area_tag); | |
965 | continue; | |
966 | } | |
967 | ||
968 | uint32_t metric = area->oldmetric | |
969 | ? circuit->metric[level - 1] | |
970 | : circuit->te_metric[level - 1]; | |
971 | ||
972 | if (circuit->ip_router && circuit->ip_addrs | |
973 | && circuit->ip_addrs->count > 0) { | |
974 | lsp_debug( | |
975 | "ISIS (%s): Circuit has IPv4 active, adding respective TLVs.", | |
976 | area->area_tag); | |
977 | struct listnode *ipnode; | |
978 | struct prefix_ipv4 *ipv4; | |
979 | for (ALL_LIST_ELEMENTS_RO(circuit->ip_addrs, ipnode, | |
980 | ipv4)) { | |
981 | if (area->oldmetric) { | |
982 | lsp_debug( | |
983 | "ISIS (%s): Adding old-style IP reachability for %s", | |
984 | area->area_tag, | |
985 | prefix2str(ipv4, buf, | |
986 | sizeof(buf))); | |
987 | isis_tlvs_add_oldstyle_ip_reach( | |
988 | lsp->tlvs, ipv4, metric); | |
989 | } | |
990 | ||
991 | if (area->newmetric) { | |
992 | lsp_debug( | |
993 | "ISIS (%s): Adding te-style IP reachability for %s", | |
994 | area->area_tag, | |
995 | prefix2str(ipv4, buf, | |
996 | sizeof(buf))); | |
997 | isis_tlvs_add_extended_ip_reach( | |
998 | lsp->tlvs, ipv4, metric); | |
999 | } | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | if (circuit->ipv6_router && circuit->ipv6_non_link | |
1004 | && circuit->ipv6_non_link->count > 0) { | |
1005 | struct listnode *ipnode; | |
1006 | struct prefix_ipv6 *ipv6; | |
1007 | for (ALL_LIST_ELEMENTS_RO(circuit->ipv6_non_link, | |
1008 | ipnode, ipv6)) { | |
1009 | lsp_debug( | |
1010 | "ISIS (%s): Adding IPv6 reachability for %s", | |
1011 | area->area_tag, | |
1012 | prefix2str(ipv6, buf, sizeof(buf))); | |
1013 | isis_tlvs_add_ipv6_reach( | |
1014 | lsp->tlvs, | |
1015 | isis_area_ipv6_topology(area), ipv6, | |
1016 | metric); | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | switch (circuit->circ_type) { | |
1021 | case CIRCUIT_T_BROADCAST: | |
1022 | if (level & circuit->is_type) { | |
1023 | uint8_t *ne_id = | |
1024 | (level == IS_LEVEL_1) | |
1025 | ? circuit->u.bc.l1_desig_is | |
1026 | : circuit->u.bc.l2_desig_is; | |
1027 | ||
1028 | if (LSP_PSEUDO_ID(ne_id)) { | |
1029 | if (area->oldmetric) { | |
1030 | lsp_debug( | |
1031 | "ISIS (%s): Adding DIS %s.%02x as old-style neighbor", | |
1032 | area->area_tag, | |
1033 | sysid_print(ne_id), | |
1034 | LSP_PSEUDO_ID(ne_id)); | |
1035 | isis_tlvs_add_oldstyle_reach( | |
1036 | lsp->tlvs, ne_id, | |
1037 | metric); | |
1038 | } | |
1039 | if (area->newmetric) { | |
1040 | uint8_t subtlvs[256]; | |
1041 | uint8_t subtlv_len; | |
1042 | ||
1043 | if (IS_MPLS_TE(area->mta) | |
1044 | && circuit->interface | |
1045 | && HAS_LINK_PARAMS( | |
1046 | circuit->interface)) | |
1047 | subtlv_len = add_te_subtlvs( | |
1048 | subtlvs, | |
1049 | circuit->mtc); | |
1050 | else | |
1051 | subtlv_len = 0; | |
1052 | ||
1053 | tlvs_add_mt_bcast( | |
1054 | lsp->tlvs, circuit, | |
1055 | level, ne_id, metric, | |
1056 | subtlvs, subtlv_len); | |
1057 | } | |
1058 | } | |
1059 | } else { | |
1060 | lsp_debug( | |
1061 | "ISIS (%s): Circuit is not active for current level. Not adding IS neighbors", | |
1062 | area->area_tag); | |
1063 | } | |
1064 | break; | |
1065 | case CIRCUIT_T_P2P: { | |
1066 | struct isis_adjacency *nei = circuit->u.p2p.neighbor; | |
1067 | if (nei && nei->adj_state == ISIS_ADJ_UP | |
1068 | && (level & nei->circuit_t)) { | |
1069 | uint8_t ne_id[7]; | |
1070 | memcpy(ne_id, nei->sysid, ISIS_SYS_ID_LEN); | |
1071 | LSP_PSEUDO_ID(ne_id) = 0; | |
1072 | ||
1073 | if (area->oldmetric) { | |
1074 | lsp_debug( | |
1075 | "ISIS (%s): Adding old-style is reach for %s", | |
1076 | area->area_tag, | |
1077 | sysid_print(ne_id)); | |
1078 | isis_tlvs_add_oldstyle_reach( | |
1079 | lsp->tlvs, ne_id, metric); | |
1080 | } | |
1081 | if (area->newmetric) { | |
1082 | uint8_t subtlvs[256]; | |
1083 | uint8_t subtlv_len; | |
1084 | ||
1085 | if (IS_MPLS_TE(area->mta) | |
1086 | && circuit->interface != NULL | |
1087 | && HAS_LINK_PARAMS( | |
1088 | circuit->interface)) | |
1089 | /* Update Local and Remote IP | |
1090 | * address for MPLS TE circuit | |
1091 | * parameters */ | |
1092 | /* NOTE sure that it is the | |
1093 | * pertinent place for that | |
1094 | * updates */ | |
1095 | /* Local IP address could be | |
1096 | * updated in isis_circuit.c - | |
1097 | * isis_circuit_add_addr() */ | |
1098 | /* But, where update remote IP | |
1099 | * address ? in isis_pdu.c - | |
1100 | * process_p2p_hello() ? */ | |
1101 | ||
1102 | /* Add SubTLVs & Adjust real | |
1103 | * size of SubTLVs */ | |
1104 | subtlv_len = add_te_subtlvs( | |
1105 | subtlvs, circuit->mtc); | |
1106 | else | |
1107 | /* Or keep only TE metric with | |
1108 | * no SubTLVs if MPLS_TE is off | |
1109 | */ | |
1110 | subtlv_len = 0; | |
1111 | ||
1112 | uint32_t neighbor_metric; | |
1113 | if (fabricd_tier(area) == 0) { | |
1114 | neighbor_metric = 0xffe; | |
1115 | } else { | |
1116 | neighbor_metric = metric; | |
1117 | } | |
1118 | ||
1119 | tlvs_add_mt_p2p(lsp->tlvs, circuit, | |
1120 | ne_id, neighbor_metric, | |
1121 | subtlvs, subtlv_len); | |
1122 | } | |
1123 | } else { | |
1124 | lsp_debug( | |
1125 | "ISIS (%s): No adjacency for given level on this circuit. Not adding IS neighbors", | |
1126 | area->area_tag); | |
1127 | } | |
1128 | } break; | |
1129 | case CIRCUIT_T_LOOPBACK: | |
1130 | break; | |
1131 | default: | |
1132 | zlog_warn("lsp_area_create: unknown circuit type"); | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | lsp_build_ext_reach(lsp, area); | |
1137 | ||
1138 | struct isis_tlvs *tlvs = lsp->tlvs; | |
1139 | lsp->tlvs = NULL; | |
1140 | ||
1141 | lsp_adjust_stream(lsp); | |
1142 | lsp_pack_pdu(lsp); | |
1143 | size_t tlv_space = STREAM_WRITEABLE(lsp->pdu) - LLC_LEN; | |
1144 | lsp_clear_data(lsp); | |
1145 | ||
1146 | struct list *fragments = isis_fragment_tlvs(tlvs, tlv_space); | |
1147 | if (!fragments) { | |
1148 | zlog_warn("BUG: could not fragment own LSP:"); | |
1149 | log_multiline(LOG_WARNING, " ", "%s", | |
1150 | isis_format_tlvs(tlvs)); | |
1151 | isis_free_tlvs(tlvs); | |
1152 | return; | |
1153 | } | |
1154 | isis_free_tlvs(tlvs); | |
1155 | ||
1156 | bool fragment_overflow = false; | |
1157 | frag = lsp; | |
1158 | for (ALL_LIST_ELEMENTS_RO(fragments, node, tlvs)) { | |
1159 | if (node != listhead(fragments)) { | |
1160 | if (LSP_FRAGMENT(frag->hdr.lsp_id) == 255) { | |
1161 | if (!fragment_overflow) { | |
1162 | fragment_overflow = true; | |
1163 | zlog_warn( | |
1164 | "ISIS (%s): Too much information for 256 fragments", | |
1165 | area->area_tag); | |
1166 | } | |
1167 | isis_free_tlvs(tlvs); | |
1168 | continue; | |
1169 | } | |
1170 | ||
1171 | frag = lsp_next_frag(LSP_FRAGMENT(frag->hdr.lsp_id) + 1, | |
1172 | lsp, area, level); | |
1173 | lsp_adjust_stream(frag); | |
1174 | } | |
1175 | frag->tlvs = tlvs; | |
1176 | } | |
1177 | ||
1178 | list_delete(&fragments); | |
1179 | lsp_debug("ISIS (%s): LSP construction is complete. Serializing...", | |
1180 | area->area_tag); | |
1181 | return; | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * 7.3.7 and 7.3.9 Generation on non-pseudonode LSPs | |
1186 | */ | |
1187 | int lsp_generate(struct isis_area *area, int level) | |
1188 | { | |
1189 | struct isis_lsp *oldlsp, *newlsp; | |
1190 | uint32_t seq_num = 0; | |
1191 | uint8_t lspid[ISIS_SYS_ID_LEN + 2]; | |
1192 | uint16_t rem_lifetime, refresh_time; | |
1193 | ||
1194 | if ((area == NULL) || (area->is_type & level) != level) | |
1195 | return ISIS_ERROR; | |
1196 | ||
1197 | memset(&lspid, 0, ISIS_SYS_ID_LEN + 2); | |
1198 | memcpy(&lspid, isis->sysid, ISIS_SYS_ID_LEN); | |
1199 | ||
1200 | /* only builds the lsp if the area shares the level */ | |
1201 | oldlsp = lsp_search(&area->lspdb[level - 1], lspid); | |
1202 | if (oldlsp) { | |
1203 | /* FIXME: we should actually initiate a purge */ | |
1204 | seq_num = oldlsp->hdr.seqno; | |
1205 | lsp_search_and_destroy(&area->lspdb[level - 1], | |
1206 | oldlsp->hdr.lsp_id); | |
1207 | } | |
1208 | rem_lifetime = lsp_rem_lifetime(area, level); | |
1209 | newlsp = | |
1210 | lsp_new(area, lspid, rem_lifetime, seq_num, | |
1211 | area->is_type | area->overload_bit | area->attached_bit, | |
1212 | 0, NULL, level); | |
1213 | newlsp->area = area; | |
1214 | newlsp->own_lsp = 1; | |
1215 | ||
1216 | lsp_insert(&area->lspdb[level - 1], newlsp); | |
1217 | /* build_lsp_data (newlsp, area); */ | |
1218 | lsp_build(newlsp, area); | |
1219 | /* time to calculate our checksum */ | |
1220 | lsp_seqno_update(newlsp); | |
1221 | newlsp->last_generated = time(NULL); | |
1222 | lsp_flood(newlsp, NULL); | |
1223 | area->lsp_gen_count[level - 1]++; | |
1224 | ||
1225 | refresh_time = lsp_refresh_time(newlsp, rem_lifetime); | |
1226 | ||
1227 | THREAD_TIMER_OFF(area->t_lsp_refresh[level - 1]); | |
1228 | area->lsp_regenerate_pending[level - 1] = 0; | |
1229 | thread_add_timer(master, lsp_refresh, | |
1230 | &area->lsp_refresh_arg[level - 1], refresh_time, | |
1231 | &area->t_lsp_refresh[level - 1]); | |
1232 | ||
1233 | if (isis->debugs & DEBUG_UPDATE_PACKETS) { | |
1234 | zlog_debug("ISIS-Upd (%s): Building L%d LSP %s, len %" PRIu16 | |
1235 | ", seq 0x%08" PRIx32 ", cksum 0x%04" PRIx16 | |
1236 | ", lifetime %" PRIu16 "s refresh %" PRIu16 "s", | |
1237 | area->area_tag, level, | |
1238 | rawlspid_print(newlsp->hdr.lsp_id), | |
1239 | newlsp->hdr.pdu_len, newlsp->hdr.seqno, | |
1240 | newlsp->hdr.checksum, newlsp->hdr.rem_lifetime, | |
1241 | refresh_time); | |
1242 | } | |
1243 | sched_debug( | |
1244 | "ISIS (%s): Built L%d LSP. Set triggered regenerate to non-pending.", | |
1245 | area->area_tag, level); | |
1246 | ||
1247 | #ifndef FABRICD | |
1248 | /* send northbound notification */ | |
1249 | isis_notif_lsp_gen(area, rawlspid_print(newlsp->hdr.lsp_id), | |
1250 | newlsp->hdr.seqno, newlsp->last_generated); | |
1251 | #endif /* ifndef FABRICD */ | |
1252 | ||
1253 | return ISIS_OK; | |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * Search own LSPs, update holding time and flood | |
1258 | */ | |
1259 | static int lsp_regenerate(struct isis_area *area, int level) | |
1260 | { | |
1261 | struct lspdb_head *head; | |
1262 | struct isis_lsp *lsp, *frag; | |
1263 | struct listnode *node; | |
1264 | uint8_t lspid[ISIS_SYS_ID_LEN + 2]; | |
1265 | uint16_t rem_lifetime, refresh_time; | |
1266 | ||
1267 | if ((area == NULL) || (area->is_type & level) != level) | |
1268 | return ISIS_ERROR; | |
1269 | ||
1270 | head = &area->lspdb[level - 1]; | |
1271 | ||
1272 | memset(lspid, 0, ISIS_SYS_ID_LEN + 2); | |
1273 | memcpy(lspid, isis->sysid, ISIS_SYS_ID_LEN); | |
1274 | ||
1275 | lsp = lsp_search(head, lspid); | |
1276 | ||
1277 | if (!lsp) { | |
1278 | flog_err(EC_LIB_DEVELOPMENT, | |
1279 | "ISIS-Upd (%s): lsp_regenerate: no L%d LSP found!", | |
1280 | area->area_tag, level); | |
1281 | return ISIS_ERROR; | |
1282 | } | |
1283 | ||
1284 | lsp_clear_data(lsp); | |
1285 | lsp_build(lsp, area); | |
1286 | rem_lifetime = lsp_rem_lifetime(area, level); | |
1287 | lsp->hdr.rem_lifetime = rem_lifetime; | |
1288 | lsp->last_generated = time(NULL); | |
1289 | lsp_flood(lsp, NULL); | |
1290 | area->lsp_gen_count[level - 1]++; | |
1291 | for (ALL_LIST_ELEMENTS_RO(lsp->lspu.frags, node, frag)) { | |
1292 | if (!frag->tlvs) { | |
1293 | /* Updating and flooding should only affect fragments | |
1294 | * carrying data | |
1295 | */ | |
1296 | continue; | |
1297 | } | |
1298 | ||
1299 | frag->hdr.lsp_bits = lsp_bits_generate( | |
1300 | level, area->overload_bit, area->attached_bit); | |
1301 | /* Set the lifetime values of all the fragments to the same | |
1302 | * value, | |
1303 | * so that no fragment expires before the lsp is refreshed. | |
1304 | */ | |
1305 | frag->hdr.rem_lifetime = rem_lifetime; | |
1306 | frag->age_out = ZERO_AGE_LIFETIME; | |
1307 | lsp_flood(frag, NULL); | |
1308 | } | |
1309 | lsp_seqno_update(lsp); | |
1310 | ||
1311 | refresh_time = lsp_refresh_time(lsp, rem_lifetime); | |
1312 | thread_add_timer(master, lsp_refresh, | |
1313 | &area->lsp_refresh_arg[level - 1], refresh_time, | |
1314 | &area->t_lsp_refresh[level - 1]); | |
1315 | area->lsp_regenerate_pending[level - 1] = 0; | |
1316 | ||
1317 | if (isis->debugs & DEBUG_UPDATE_PACKETS) { | |
1318 | zlog_debug( | |
1319 | "ISIS-Upd (%s): Refreshed our L%d LSP %s, len %" PRIu16 | |
1320 | ", seq 0x%08" PRIx32 ", cksum 0x%04" PRIx16 | |
1321 | ", lifetime %" PRIu16 "s refresh %" PRIu16 "s", | |
1322 | area->area_tag, level, rawlspid_print(lsp->hdr.lsp_id), | |
1323 | lsp->hdr.pdu_len, lsp->hdr.seqno, lsp->hdr.checksum, | |
1324 | lsp->hdr.rem_lifetime, refresh_time); | |
1325 | } | |
1326 | sched_debug( | |
1327 | "ISIS (%s): Rebuilt L%d LSP. Set triggered regenerate to non-pending.", | |
1328 | area->area_tag, level); | |
1329 | ||
1330 | return ISIS_OK; | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * Something has changed or periodic refresh -> regenerate LSP | |
1335 | */ | |
1336 | static int lsp_refresh(struct thread *thread) | |
1337 | { | |
1338 | struct lsp_refresh_arg *arg = THREAD_ARG(thread); | |
1339 | ||
1340 | assert(arg); | |
1341 | ||
1342 | struct isis_area *area = arg->area; | |
1343 | ||
1344 | assert(area); | |
1345 | ||
1346 | int level = arg->level; | |
1347 | ||
1348 | area->t_lsp_refresh[level - 1] = NULL; | |
1349 | area->lsp_regenerate_pending[level - 1] = 0; | |
1350 | ||
1351 | if ((area->is_type & level) == 0) | |
1352 | return ISIS_ERROR; | |
1353 | ||
1354 | if (monotime_since(&area->last_lsp_refresh_event[level - 1], NULL) < 100000L) { | |
1355 | sched_debug("ISIS (%s): Still unstable, postpone LSP L%d refresh", | |
1356 | area->area_tag, level); | |
1357 | _lsp_regenerate_schedule(area, level, 0, false, | |
1358 | __func__, __FILE__, __LINE__); | |
1359 | return 0; | |
1360 | } | |
1361 | ||
1362 | sched_debug( | |
1363 | "ISIS (%s): LSP L%d refresh timer expired. Refreshing LSP...", | |
1364 | area->area_tag, level); | |
1365 | return lsp_regenerate(area, level); | |
1366 | } | |
1367 | ||
1368 | int _lsp_regenerate_schedule(struct isis_area *area, int level, | |
1369 | int all_pseudo, bool postpone, | |
1370 | const char *func, const char *file, | |
1371 | int line) | |
1372 | { | |
1373 | struct isis_lsp *lsp; | |
1374 | uint8_t id[ISIS_SYS_ID_LEN + 2]; | |
1375 | time_t now, diff; | |
1376 | long timeout; | |
1377 | struct listnode *cnode; | |
1378 | struct isis_circuit *circuit; | |
1379 | int lvl; | |
1380 | ||
1381 | if (area == NULL) | |
1382 | return ISIS_ERROR; | |
1383 | ||
1384 | sched_debug( | |
1385 | "ISIS (%s): Scheduling regeneration of %s LSPs, %sincluding PSNs" | |
1386 | " Caller: %s %s:%d", | |
1387 | area->area_tag, circuit_t2string(level), | |
1388 | all_pseudo ? "" : "not ", | |
1389 | func, file, line); | |
1390 | ||
1391 | memcpy(id, isis->sysid, ISIS_SYS_ID_LEN); | |
1392 | LSP_PSEUDO_ID(id) = LSP_FRAGMENT(id) = 0; | |
1393 | now = time(NULL); | |
1394 | ||
1395 | for (lvl = IS_LEVEL_1; lvl <= IS_LEVEL_2; lvl++) { | |
1396 | if (!((level & lvl) && (area->is_type & lvl))) | |
1397 | continue; | |
1398 | ||
1399 | if (postpone) { | |
1400 | monotime(&area->last_lsp_refresh_event[lvl - 1]); | |
1401 | } | |
1402 | ||
1403 | sched_debug( | |
1404 | "ISIS (%s): Checking whether L%d needs to be scheduled", | |
1405 | area->area_tag, lvl); | |
1406 | ||
1407 | if (area->lsp_regenerate_pending[lvl - 1]) { | |
1408 | struct timeval remain = thread_timer_remain( | |
1409 | area->t_lsp_refresh[lvl - 1]); | |
1410 | sched_debug( | |
1411 | "ISIS (%s): Regeneration is already pending, nothing todo." | |
1412 | " (Due in %lld.%03lld seconds)", | |
1413 | area->area_tag, (long long)remain.tv_sec, | |
1414 | (long long)remain.tv_usec / 1000); | |
1415 | continue; | |
1416 | } | |
1417 | ||
1418 | lsp = lsp_search(&area->lspdb[lvl - 1], id); | |
1419 | if (!lsp) { | |
1420 | sched_debug( | |
1421 | "ISIS (%s): We do not have any LSPs to regenerate, nothing todo.", | |
1422 | area->area_tag); | |
1423 | continue; | |
1424 | } | |
1425 | ||
1426 | /* | |
1427 | * Throttle avoidance | |
1428 | */ | |
1429 | sched_debug( | |
1430 | "ISIS (%s): Will schedule regen timer. Last run was: %lld, Now is: %lld", | |
1431 | area->area_tag, (long long)lsp->last_generated, | |
1432 | (long long)now); | |
1433 | THREAD_TIMER_OFF(area->t_lsp_refresh[lvl - 1]); | |
1434 | diff = now - lsp->last_generated; | |
1435 | if (diff < area->lsp_gen_interval[lvl - 1]) { | |
1436 | timeout = | |
1437 | 1000 * (area->lsp_gen_interval[lvl - 1] - diff); | |
1438 | sched_debug( | |
1439 | "ISIS (%s): Scheduling in %ld ms to match configured lsp_gen_interval", | |
1440 | area->area_tag, timeout); | |
1441 | } else { | |
1442 | /* | |
1443 | * lsps are not regenerated if lsp_regenerate function | |
1444 | * is called | |
1445 | * directly. However if the lsp_regenerate call is | |
1446 | * queued for | |
1447 | * later execution it works. | |
1448 | */ | |
1449 | timeout = 100; | |
1450 | sched_debug( | |
1451 | "ISIS (%s): Last generation was more than lsp_gen_interval ago." | |
1452 | " Scheduling for execution in %ld ms.", | |
1453 | area->area_tag, timeout); | |
1454 | } | |
1455 | ||
1456 | area->lsp_regenerate_pending[lvl - 1] = 1; | |
1457 | thread_add_timer_msec(master, lsp_refresh, | |
1458 | &area->lsp_refresh_arg[lvl - 1], | |
1459 | timeout, | |
1460 | &area->t_lsp_refresh[lvl - 1]); | |
1461 | } | |
1462 | ||
1463 | if (all_pseudo) { | |
1464 | for (ALL_LIST_ELEMENTS_RO(area->circuit_list, cnode, circuit)) | |
1465 | lsp_regenerate_schedule_pseudo(circuit, level); | |
1466 | } | |
1467 | ||
1468 | return ISIS_OK; | |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * Funcs for pseudonode LSPs | |
1473 | */ | |
1474 | ||
1475 | /* | |
1476 | * 7.3.8 and 7.3.10 Generation of level 1 and 2 pseudonode LSPs | |
1477 | */ | |
1478 | static void lsp_build_pseudo(struct isis_lsp *lsp, struct isis_circuit *circuit, | |
1479 | int level) | |
1480 | { | |
1481 | struct isis_adjacency *adj; | |
1482 | struct list *adj_list; | |
1483 | struct listnode *node; | |
1484 | struct isis_area *area = circuit->area; | |
1485 | ||
1486 | lsp_clear_data(lsp); | |
1487 | lsp->tlvs = isis_alloc_tlvs(); | |
1488 | lsp_debug( | |
1489 | "ISIS (%s): Constructing pseudo LSP %s for interface %s level %d", | |
1490 | area->area_tag, rawlspid_print(lsp->hdr.lsp_id), | |
1491 | circuit->interface->name, level); | |
1492 | ||
1493 | lsp->level = level; | |
1494 | /* RFC3787 section 4 SHOULD not set overload bit in pseudo LSPs */ | |
1495 | lsp->hdr.lsp_bits = | |
1496 | lsp_bits_generate(level, 0, circuit->area->attached_bit); | |
1497 | ||
1498 | /* | |
1499 | * add self to IS neighbours | |
1500 | */ | |
1501 | uint8_t ne_id[ISIS_SYS_ID_LEN + 1]; | |
1502 | ||
1503 | memcpy(ne_id, isis->sysid, ISIS_SYS_ID_LEN); | |
1504 | LSP_PSEUDO_ID(ne_id) = 0; | |
1505 | ||
1506 | if (circuit->area->oldmetric) { | |
1507 | isis_tlvs_add_oldstyle_reach(lsp->tlvs, ne_id, 0); | |
1508 | lsp_debug( | |
1509 | "ISIS (%s): Adding %s.%02x as old-style neighbor (self)", | |
1510 | area->area_tag, sysid_print(ne_id), | |
1511 | LSP_PSEUDO_ID(ne_id)); | |
1512 | } | |
1513 | if (circuit->area->newmetric) { | |
1514 | isis_tlvs_add_extended_reach(lsp->tlvs, ISIS_MT_IPV4_UNICAST, | |
1515 | ne_id, 0, NULL, 0); | |
1516 | lsp_debug( | |
1517 | "ISIS (%s): Adding %s.%02x as te-style neighbor (self)", | |
1518 | area->area_tag, sysid_print(ne_id), | |
1519 | LSP_PSEUDO_ID(ne_id)); | |
1520 | } | |
1521 | ||
1522 | adj_list = list_new(); | |
1523 | isis_adj_build_up_list(circuit->u.bc.adjdb[level - 1], adj_list); | |
1524 | ||
1525 | for (ALL_LIST_ELEMENTS_RO(adj_list, node, adj)) { | |
1526 | if (!(adj->level & level)) { | |
1527 | lsp_debug( | |
1528 | "ISIS (%s): Ignoring neighbor %s, level does not intersect", | |
1529 | area->area_tag, sysid_print(adj->sysid)); | |
1530 | continue; | |
1531 | } | |
1532 | ||
1533 | if (!(level == IS_LEVEL_1 | |
1534 | && adj->sys_type == ISIS_SYSTYPE_L1_IS) | |
1535 | && !(level == IS_LEVEL_1 | |
1536 | && adj->sys_type == ISIS_SYSTYPE_L2_IS | |
1537 | && adj->adj_usage == ISIS_ADJ_LEVEL1AND2) | |
1538 | && !(level == IS_LEVEL_2 | |
1539 | && adj->sys_type == ISIS_SYSTYPE_L2_IS)) { | |
1540 | lsp_debug( | |
1541 | "ISIS (%s): Ignoring neighbor %s, level does not match", | |
1542 | area->area_tag, sysid_print(adj->sysid)); | |
1543 | continue; | |
1544 | } | |
1545 | ||
1546 | memcpy(ne_id, adj->sysid, ISIS_SYS_ID_LEN); | |
1547 | if (circuit->area->oldmetric) { | |
1548 | isis_tlvs_add_oldstyle_reach(lsp->tlvs, ne_id, 0); | |
1549 | lsp_debug( | |
1550 | "ISIS (%s): Adding %s.%02x as old-style neighbor (peer)", | |
1551 | area->area_tag, sysid_print(ne_id), | |
1552 | LSP_PSEUDO_ID(ne_id)); | |
1553 | } | |
1554 | if (circuit->area->newmetric) { | |
1555 | isis_tlvs_add_extended_reach(lsp->tlvs, | |
1556 | ISIS_MT_IPV4_UNICAST, | |
1557 | ne_id, 0, NULL, 0); | |
1558 | lsp_debug( | |
1559 | "ISIS (%s): Adding %s.%02x as te-style neighbor (peer)", | |
1560 | area->area_tag, sysid_print(ne_id), | |
1561 | LSP_PSEUDO_ID(ne_id)); | |
1562 | } | |
1563 | } | |
1564 | list_delete(&adj_list); | |
1565 | return; | |
1566 | } | |
1567 | ||
1568 | int lsp_generate_pseudo(struct isis_circuit *circuit, int level) | |
1569 | { | |
1570 | struct lspdb_head *head = &circuit->area->lspdb[level - 1]; | |
1571 | struct isis_lsp *lsp; | |
1572 | uint8_t lsp_id[ISIS_SYS_ID_LEN + 2]; | |
1573 | uint16_t rem_lifetime, refresh_time; | |
1574 | ||
1575 | if ((circuit->is_type & level) != level | |
1576 | || (circuit->state != C_STATE_UP) | |
1577 | || (circuit->circ_type != CIRCUIT_T_BROADCAST) | |
1578 | || (circuit->u.bc.is_dr[level - 1] == 0)) | |
1579 | return ISIS_ERROR; | |
1580 | ||
1581 | memcpy(lsp_id, isis->sysid, ISIS_SYS_ID_LEN); | |
1582 | LSP_FRAGMENT(lsp_id) = 0; | |
1583 | LSP_PSEUDO_ID(lsp_id) = circuit->circuit_id; | |
1584 | ||
1585 | /* | |
1586 | * If for some reason have a pseudo LSP in the db already -> regenerate | |
1587 | */ | |
1588 | if (lsp_search(head, lsp_id)) | |
1589 | return lsp_regenerate_schedule_pseudo(circuit, level); | |
1590 | ||
1591 | rem_lifetime = lsp_rem_lifetime(circuit->area, level); | |
1592 | /* RFC3787 section 4 SHOULD not set overload bit in pseudo LSPs */ | |
1593 | lsp = lsp_new(circuit->area, lsp_id, rem_lifetime, 1, | |
1594 | circuit->area->is_type | circuit->area->attached_bit, 0, | |
1595 | NULL, level); | |
1596 | lsp->area = circuit->area; | |
1597 | ||
1598 | lsp_build_pseudo(lsp, circuit, level); | |
1599 | lsp_pack_pdu(lsp); | |
1600 | lsp->own_lsp = 1; | |
1601 | lsp_insert(head, lsp); | |
1602 | lsp_flood(lsp, NULL); | |
1603 | ||
1604 | refresh_time = lsp_refresh_time(lsp, rem_lifetime); | |
1605 | THREAD_TIMER_OFF(circuit->u.bc.t_refresh_pseudo_lsp[level - 1]); | |
1606 | circuit->lsp_regenerate_pending[level - 1] = 0; | |
1607 | if (level == IS_LEVEL_1) | |
1608 | thread_add_timer( | |
1609 | master, lsp_l1_refresh_pseudo, circuit, refresh_time, | |
1610 | &circuit->u.bc.t_refresh_pseudo_lsp[level - 1]); | |
1611 | else if (level == IS_LEVEL_2) | |
1612 | thread_add_timer( | |
1613 | master, lsp_l2_refresh_pseudo, circuit, refresh_time, | |
1614 | &circuit->u.bc.t_refresh_pseudo_lsp[level - 1]); | |
1615 | ||
1616 | if (isis->debugs & DEBUG_UPDATE_PACKETS) { | |
1617 | zlog_debug( | |
1618 | "ISIS-Upd (%s): Built L%d Pseudo LSP %s, len %" PRIu16 | |
1619 | ", seq 0x%08" PRIx32 ", cksum 0x%04" PRIx16 | |
1620 | ", lifetime %" PRIu16 "s, refresh %" PRIu16 "s", | |
1621 | circuit->area->area_tag, level, | |
1622 | rawlspid_print(lsp->hdr.lsp_id), lsp->hdr.pdu_len, | |
1623 | lsp->hdr.seqno, lsp->hdr.checksum, | |
1624 | lsp->hdr.rem_lifetime, refresh_time); | |
1625 | } | |
1626 | ||
1627 | return ISIS_OK; | |
1628 | } | |
1629 | ||
1630 | static int lsp_regenerate_pseudo(struct isis_circuit *circuit, int level) | |
1631 | { | |
1632 | struct lspdb_head *head = &circuit->area->lspdb[level - 1]; | |
1633 | struct isis_lsp *lsp; | |
1634 | uint8_t lsp_id[ISIS_SYS_ID_LEN + 2]; | |
1635 | uint16_t rem_lifetime, refresh_time; | |
1636 | ||
1637 | if ((circuit->is_type & level) != level | |
1638 | || (circuit->state != C_STATE_UP) | |
1639 | || (circuit->circ_type != CIRCUIT_T_BROADCAST) | |
1640 | || (circuit->u.bc.is_dr[level - 1] == 0)) | |
1641 | return ISIS_ERROR; | |
1642 | ||
1643 | memcpy(lsp_id, isis->sysid, ISIS_SYS_ID_LEN); | |
1644 | LSP_PSEUDO_ID(lsp_id) = circuit->circuit_id; | |
1645 | LSP_FRAGMENT(lsp_id) = 0; | |
1646 | ||
1647 | lsp = lsp_search(head, lsp_id); | |
1648 | ||
1649 | if (!lsp) { | |
1650 | flog_err(EC_LIB_DEVELOPMENT, | |
1651 | "lsp_regenerate_pseudo: no l%d LSP %s found!", level, | |
1652 | rawlspid_print(lsp_id)); | |
1653 | return ISIS_ERROR; | |
1654 | } | |
1655 | ||
1656 | rem_lifetime = lsp_rem_lifetime(circuit->area, level); | |
1657 | lsp->hdr.rem_lifetime = rem_lifetime; | |
1658 | lsp_build_pseudo(lsp, circuit, level); | |
1659 | lsp_inc_seqno(lsp, 0); | |
1660 | lsp->last_generated = time(NULL); | |
1661 | lsp_flood(lsp, NULL); | |
1662 | ||
1663 | refresh_time = lsp_refresh_time(lsp, rem_lifetime); | |
1664 | if (level == IS_LEVEL_1) | |
1665 | thread_add_timer( | |
1666 | master, lsp_l1_refresh_pseudo, circuit, refresh_time, | |
1667 | &circuit->u.bc.t_refresh_pseudo_lsp[level - 1]); | |
1668 | else if (level == IS_LEVEL_2) | |
1669 | thread_add_timer( | |
1670 | master, lsp_l2_refresh_pseudo, circuit, refresh_time, | |
1671 | &circuit->u.bc.t_refresh_pseudo_lsp[level - 1]); | |
1672 | ||
1673 | if (isis->debugs & DEBUG_UPDATE_PACKETS) { | |
1674 | zlog_debug( | |
1675 | "ISIS-Upd (%s): Refreshed L%d Pseudo LSP %s, len %" PRIu16 | |
1676 | ", seq 0x%08" PRIx32 ", cksum 0x%04" PRIx16 | |
1677 | ", lifetime %" PRIu16 "s, refresh %" PRIu16 "s", | |
1678 | circuit->area->area_tag, level, | |
1679 | rawlspid_print(lsp->hdr.lsp_id), lsp->hdr.pdu_len, | |
1680 | lsp->hdr.seqno, lsp->hdr.checksum, | |
1681 | lsp->hdr.rem_lifetime, refresh_time); | |
1682 | } | |
1683 | ||
1684 | return ISIS_OK; | |
1685 | } | |
1686 | ||
1687 | /* | |
1688 | * Something has changed or periodic refresh -> regenerate pseudo LSP | |
1689 | */ | |
1690 | static int lsp_l1_refresh_pseudo(struct thread *thread) | |
1691 | { | |
1692 | struct isis_circuit *circuit; | |
1693 | uint8_t id[ISIS_SYS_ID_LEN + 2]; | |
1694 | ||
1695 | circuit = THREAD_ARG(thread); | |
1696 | ||
1697 | circuit->u.bc.t_refresh_pseudo_lsp[0] = NULL; | |
1698 | circuit->lsp_regenerate_pending[0] = 0; | |
1699 | ||
1700 | if ((circuit->u.bc.is_dr[0] == 0) | |
1701 | || (circuit->is_type & IS_LEVEL_1) == 0) { | |
1702 | memcpy(id, isis->sysid, ISIS_SYS_ID_LEN); | |
1703 | LSP_PSEUDO_ID(id) = circuit->circuit_id; | |
1704 | LSP_FRAGMENT(id) = 0; | |
1705 | lsp_purge_pseudo(id, circuit, IS_LEVEL_1); | |
1706 | return ISIS_ERROR; | |
1707 | } | |
1708 | ||
1709 | return lsp_regenerate_pseudo(circuit, IS_LEVEL_1); | |
1710 | } | |
1711 | ||
1712 | static int lsp_l2_refresh_pseudo(struct thread *thread) | |
1713 | { | |
1714 | struct isis_circuit *circuit; | |
1715 | uint8_t id[ISIS_SYS_ID_LEN + 2]; | |
1716 | ||
1717 | circuit = THREAD_ARG(thread); | |
1718 | ||
1719 | circuit->u.bc.t_refresh_pseudo_lsp[1] = NULL; | |
1720 | circuit->lsp_regenerate_pending[1] = 0; | |
1721 | ||
1722 | if ((circuit->u.bc.is_dr[1] == 0) | |
1723 | || (circuit->is_type & IS_LEVEL_2) == 0) { | |
1724 | memcpy(id, isis->sysid, ISIS_SYS_ID_LEN); | |
1725 | LSP_PSEUDO_ID(id) = circuit->circuit_id; | |
1726 | LSP_FRAGMENT(id) = 0; | |
1727 | lsp_purge_pseudo(id, circuit, IS_LEVEL_2); | |
1728 | return ISIS_ERROR; | |
1729 | } | |
1730 | ||
1731 | return lsp_regenerate_pseudo(circuit, IS_LEVEL_2); | |
1732 | } | |
1733 | ||
1734 | int lsp_regenerate_schedule_pseudo(struct isis_circuit *circuit, int level) | |
1735 | { | |
1736 | struct isis_lsp *lsp; | |
1737 | uint8_t lsp_id[ISIS_SYS_ID_LEN + 2]; | |
1738 | time_t now, diff; | |
1739 | long timeout; | |
1740 | int lvl; | |
1741 | struct isis_area *area = circuit->area; | |
1742 | ||
1743 | if (circuit->circ_type != CIRCUIT_T_BROADCAST | |
1744 | || circuit->state != C_STATE_UP) | |
1745 | return ISIS_OK; | |
1746 | ||
1747 | sched_debug( | |
1748 | "ISIS (%s): Scheduling regeneration of %s pseudo LSP for interface %s", | |
1749 | area->area_tag, circuit_t2string(level), | |
1750 | circuit->interface->name); | |
1751 | ||
1752 | memcpy(lsp_id, isis->sysid, ISIS_SYS_ID_LEN); | |
1753 | LSP_PSEUDO_ID(lsp_id) = circuit->circuit_id; | |
1754 | LSP_FRAGMENT(lsp_id) = 0; | |
1755 | now = time(NULL); | |
1756 | ||
1757 | for (lvl = IS_LEVEL_1; lvl <= IS_LEVEL_2; lvl++) { | |
1758 | sched_debug( | |
1759 | "ISIS (%s): Checking whether L%d pseudo LSP needs to be scheduled", | |
1760 | area->area_tag, lvl); | |
1761 | ||
1762 | if (!((level & lvl) && (circuit->is_type & lvl))) { | |
1763 | sched_debug("ISIS (%s): Level is not active on circuit", | |
1764 | area->area_tag); | |
1765 | continue; | |
1766 | } | |
1767 | ||
1768 | if (circuit->u.bc.is_dr[lvl - 1] == 0) { | |
1769 | sched_debug( | |
1770 | "ISIS (%s): This IS is not DR, nothing to do.", | |
1771 | area->area_tag); | |
1772 | continue; | |
1773 | } | |
1774 | ||
1775 | if (circuit->lsp_regenerate_pending[lvl - 1]) { | |
1776 | struct timeval remain = thread_timer_remain( | |
1777 | circuit->u.bc.t_refresh_pseudo_lsp[lvl - 1]); | |
1778 | sched_debug( | |
1779 | "ISIS (%s): Regenerate is already pending, nothing todo." | |
1780 | " (Due in %lld.%03lld seconds)", | |
1781 | area->area_tag, (long long)remain.tv_sec, | |
1782 | (long long)remain.tv_usec / 1000); | |
1783 | continue; | |
1784 | } | |
1785 | ||
1786 | lsp = lsp_search(&circuit->area->lspdb[lvl - 1], lsp_id); | |
1787 | if (!lsp) { | |
1788 | sched_debug( | |
1789 | "ISIS (%s): Pseudonode LSP does not exist yet, nothing to regenerate.", | |
1790 | area->area_tag); | |
1791 | continue; | |
1792 | } | |
1793 | ||
1794 | /* | |
1795 | * Throttle avoidance | |
1796 | */ | |
1797 | sched_debug( | |
1798 | "ISIS (%s): Will schedule PSN regen timer. Last run was: %lld, Now is: %lld", | |
1799 | area->area_tag, (long long)lsp->last_generated, | |
1800 | (long long)now); | |
1801 | THREAD_TIMER_OFF(circuit->u.bc.t_refresh_pseudo_lsp[lvl - 1]); | |
1802 | diff = now - lsp->last_generated; | |
1803 | if (diff < circuit->area->lsp_gen_interval[lvl - 1]) { | |
1804 | timeout = | |
1805 | 1000 * (circuit->area->lsp_gen_interval[lvl - 1] | |
1806 | - diff); | |
1807 | sched_debug( | |
1808 | "ISIS (%s): Sechduling in %ld ms to match configured lsp_gen_interval", | |
1809 | area->area_tag, timeout); | |
1810 | } else { | |
1811 | timeout = 100; | |
1812 | sched_debug( | |
1813 | "ISIS (%s): Last generation was more than lsp_gen_interval ago." | |
1814 | " Scheduling for execution in %ld ms.", | |
1815 | area->area_tag, timeout); | |
1816 | } | |
1817 | ||
1818 | circuit->lsp_regenerate_pending[lvl - 1] = 1; | |
1819 | ||
1820 | if (lvl == IS_LEVEL_1) { | |
1821 | thread_add_timer_msec( | |
1822 | master, lsp_l1_refresh_pseudo, circuit, timeout, | |
1823 | &circuit->u.bc.t_refresh_pseudo_lsp[lvl - 1]); | |
1824 | } else if (lvl == IS_LEVEL_2) { | |
1825 | thread_add_timer_msec( | |
1826 | master, lsp_l2_refresh_pseudo, circuit, timeout, | |
1827 | &circuit->u.bc.t_refresh_pseudo_lsp[lvl - 1]); | |
1828 | } | |
1829 | } | |
1830 | ||
1831 | return ISIS_OK; | |
1832 | } | |
1833 | ||
1834 | /* | |
1835 | * Walk through LSPs for an area | |
1836 | * - set remaining lifetime | |
1837 | */ | |
1838 | int lsp_tick(struct thread *thread) | |
1839 | { | |
1840 | struct isis_area *area; | |
1841 | struct isis_lsp *lsp; | |
1842 | int level; | |
1843 | uint16_t rem_lifetime; | |
1844 | bool fabricd_sync_incomplete = false; | |
1845 | ||
1846 | area = THREAD_ARG(thread); | |
1847 | assert(area); | |
1848 | area->t_tick = NULL; | |
1849 | thread_add_timer(master, lsp_tick, area, 1, &area->t_tick); | |
1850 | ||
1851 | struct isis_circuit *fabricd_init_c = fabricd_initial_sync_circuit(area); | |
1852 | ||
1853 | /* | |
1854 | * Remove LSPs which have aged out | |
1855 | */ | |
1856 | for (level = 0; level < ISIS_LEVELS; level++) { | |
1857 | struct isis_lsp *next = lspdb_first(&area->lspdb[level]); | |
1858 | frr_each_from (lspdb, &area->lspdb[level], lsp, next) { | |
1859 | /* | |
1860 | * The lsp rem_lifetime is kept at 0 for MaxAge | |
1861 | * or | |
1862 | * ZeroAgeLifetime depending on explicit purge | |
1863 | * or | |
1864 | * natural age out. So schedule spf only once | |
1865 | * when | |
1866 | * the first time rem_lifetime becomes 0. | |
1867 | */ | |
1868 | rem_lifetime = lsp->hdr.rem_lifetime; | |
1869 | lsp_set_time(lsp); | |
1870 | ||
1871 | /* | |
1872 | * Schedule may run spf which should be done | |
1873 | * only after | |
1874 | * the lsp rem_lifetime becomes 0 for the first | |
1875 | * time. | |
1876 | * ISO 10589 - 7.3.16.4 first paragraph. | |
1877 | */ | |
1878 | if (rem_lifetime == 1 && lsp->hdr.seqno != 0) { | |
1879 | /* 7.3.16.4 a) set SRM flags on all */ | |
1880 | /* 7.3.16.4 b) retain only the header */ | |
1881 | if (lsp->area->purge_originator) | |
1882 | lsp_purge(lsp, lsp->level, NULL); | |
1883 | else | |
1884 | lsp_flood(lsp, NULL); | |
1885 | /* 7.3.16.4 c) record the time to purge | |
1886 | * FIXME */ | |
1887 | isis_spf_schedule(lsp->area, lsp->level); | |
1888 | } | |
1889 | ||
1890 | if (lsp->age_out == 0) { | |
1891 | zlog_debug( | |
1892 | "ISIS-Upd (%s): L%u LSP %s seq " | |
1893 | "0x%08" PRIx32 " aged out", | |
1894 | area->area_tag, lsp->level, | |
1895 | rawlspid_print(lsp->hdr.lsp_id), | |
1896 | lsp->hdr.seqno); | |
1897 | ||
1898 | /* if we're aging out fragment 0, lsp_destroy() | |
1899 | * below will delete all other fragments too, | |
1900 | * so we need to skip over those | |
1901 | */ | |
1902 | if (!LSP_FRAGMENT(lsp->hdr.lsp_id)) | |
1903 | while (next && | |
1904 | !memcmp(next->hdr.lsp_id, | |
1905 | lsp->hdr.lsp_id, | |
1906 | ISIS_SYS_ID_LEN + 1)) | |
1907 | next = lspdb_next( | |
1908 | &area->lspdb[level], | |
1909 | next); | |
1910 | ||
1911 | lspdb_del(&area->lspdb[level], lsp); | |
1912 | lsp_destroy(lsp); | |
1913 | lsp = NULL; | |
1914 | } | |
1915 | ||
1916 | if (fabricd_init_c && lsp) { | |
1917 | fabricd_sync_incomplete |= | |
1918 | ISIS_CHECK_FLAG(lsp->SSNflags, | |
1919 | fabricd_init_c); | |
1920 | } | |
1921 | } | |
1922 | } | |
1923 | ||
1924 | if (fabricd_init_c | |
1925 | && !fabricd_sync_incomplete | |
1926 | && !isis_tx_queue_len(fabricd_init_c->tx_queue)) { | |
1927 | fabricd_initial_sync_finish(area); | |
1928 | } | |
1929 | ||
1930 | return ISIS_OK; | |
1931 | } | |
1932 | ||
1933 | void lsp_purge_pseudo(uint8_t *id, struct isis_circuit *circuit, int level) | |
1934 | { | |
1935 | struct isis_lsp *lsp; | |
1936 | ||
1937 | lsp = lsp_search(&circuit->area->lspdb[level - 1], id); | |
1938 | if (!lsp) | |
1939 | return; | |
1940 | ||
1941 | lsp_purge(lsp, level, NULL); | |
1942 | } | |
1943 | ||
1944 | /* | |
1945 | * Purge own LSP that is received and we don't have. | |
1946 | * -> Do as in 7.3.16.4 | |
1947 | */ | |
1948 | void lsp_purge_non_exist(int level, struct isis_lsp_hdr *hdr, | |
1949 | struct isis_area *area) | |
1950 | { | |
1951 | struct isis_lsp *lsp; | |
1952 | ||
1953 | /* | |
1954 | * We need to create the LSP to be purged | |
1955 | */ | |
1956 | lsp = XCALLOC(MTYPE_ISIS_LSP, sizeof(struct isis_lsp)); | |
1957 | lsp->area = area; | |
1958 | lsp->level = level; | |
1959 | lsp_adjust_stream(lsp); | |
1960 | lsp->age_out = ZERO_AGE_LIFETIME; | |
1961 | lsp->area->lsp_purge_count[level - 1]++; | |
1962 | ||
1963 | memcpy(&lsp->hdr, hdr, sizeof(lsp->hdr)); | |
1964 | lsp->hdr.rem_lifetime = 0; | |
1965 | ||
1966 | lsp_purge_add_poi(lsp, NULL); | |
1967 | ||
1968 | lsp_pack_pdu(lsp); | |
1969 | ||
1970 | lsp_insert(&area->lspdb[lsp->level - 1], lsp); | |
1971 | lsp_flood(lsp, NULL); | |
1972 | ||
1973 | return; | |
1974 | } | |
1975 | ||
1976 | void lsp_set_all_srmflags(struct isis_lsp *lsp, bool set) | |
1977 | { | |
1978 | struct listnode *node; | |
1979 | struct isis_circuit *circuit; | |
1980 | ||
1981 | assert(lsp); | |
1982 | ||
1983 | if (!lsp->area) | |
1984 | return; | |
1985 | ||
1986 | struct list *circuit_list = lsp->area->circuit_list; | |
1987 | for (ALL_LIST_ELEMENTS_RO(circuit_list, node, circuit)) { | |
1988 | if (set) { | |
1989 | isis_tx_queue_add(circuit->tx_queue, lsp, | |
1990 | TX_LSP_NORMAL); | |
1991 | } else { | |
1992 | isis_tx_queue_del(circuit->tx_queue, lsp); | |
1993 | } | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | void _lsp_flood(struct isis_lsp *lsp, struct isis_circuit *circuit, | |
1998 | const char *func, const char *file, int line) | |
1999 | { | |
2000 | if (isis->debugs & DEBUG_FLOODING) { | |
2001 | zlog_debug("Flooding LSP %s%s%s (From %s %s:%d)", | |
2002 | rawlspid_print(lsp->hdr.lsp_id), | |
2003 | circuit ? " except on " : "", | |
2004 | circuit ? circuit->interface->name : "", | |
2005 | func, file, line); | |
2006 | } | |
2007 | ||
2008 | if (!fabricd) | |
2009 | lsp_set_all_srmflags(lsp, true); | |
2010 | else | |
2011 | fabricd_lsp_flood(lsp, circuit); | |
2012 | ||
2013 | if (circuit) | |
2014 | isis_tx_queue_del(circuit->tx_queue, lsp); | |
2015 | } | |
2016 | ||
2017 | static int lsp_handle_adj_state_change(struct isis_adjacency *adj) | |
2018 | { | |
2019 | lsp_regenerate_schedule(adj->circuit->area, IS_LEVEL_1 | IS_LEVEL_2, 0); | |
2020 | return 0; | |
2021 | } | |
2022 | ||
2023 | void lsp_init(void) | |
2024 | { | |
2025 | hook_register(isis_adj_state_change_hook, | |
2026 | lsp_handle_adj_state_change); | |
2027 | } |