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Commit | Line | Data |
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12e41d03 | 1 | /* |
896014f4 DL |
2 | * PIM for Quagga |
3 | * Copyright (C) 2008 Everton da Silva Marques | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; see the file COPYING; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
12e41d03 DL |
19 | |
20 | #include <zebra.h> | |
21 | ||
22 | #include "log.h" | |
23 | #include "prefix.h" | |
24 | #include "memory.h" | |
744d91b3 | 25 | #include "if.h" |
e446de6a DS |
26 | #include "vty.h" |
27 | #include "plist.h" | |
12e41d03 DL |
28 | |
29 | #include "pimd.h" | |
30 | #include "pim_neighbor.h" | |
31 | #include "pim_time.h" | |
32 | #include "pim_str.h" | |
33 | #include "pim_iface.h" | |
34 | #include "pim_pim.h" | |
35 | #include "pim_upstream.h" | |
36 | #include "pim_ifchannel.h" | |
e446de6a | 37 | #include "pim_rp.h" |
da72c9fd | 38 | #include "pim_zebra.h" |
982bff89 DS |
39 | #include "pim_join.h" |
40 | #include "pim_jp_agg.h" | |
ba4eb1bc | 41 | #include "pim_bfd.h" |
12e41d03 DL |
42 | |
43 | static void dr_election_by_addr(struct interface *ifp) | |
44 | { | |
d62a17ae | 45 | struct pim_interface *pim_ifp; |
46 | struct listnode *node; | |
47 | struct pim_neighbor *neigh; | |
48 | ||
49 | pim_ifp = ifp->info; | |
50 | zassert(pim_ifp); | |
51 | ||
52 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
53 | ||
54 | if (PIM_DEBUG_PIM_TRACE) { | |
55 | zlog_debug("%s: on interface %s", __PRETTY_FUNCTION__, | |
56 | ifp->name); | |
57 | } | |
58 | ||
59 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { | |
60 | if (ntohl(neigh->source_addr.s_addr) | |
61 | > ntohl(pim_ifp->pim_dr_addr.s_addr)) { | |
62 | pim_ifp->pim_dr_addr = neigh->source_addr; | |
63 | } | |
64 | } | |
12e41d03 DL |
65 | } |
66 | ||
67 | static void dr_election_by_pri(struct interface *ifp) | |
68 | { | |
d62a17ae | 69 | struct pim_interface *pim_ifp; |
70 | struct listnode *node; | |
71 | struct pim_neighbor *neigh; | |
72 | uint32_t dr_pri; | |
73 | ||
74 | pim_ifp = ifp->info; | |
75 | zassert(pim_ifp); | |
76 | ||
77 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
78 | dr_pri = pim_ifp->pim_dr_priority; | |
79 | ||
80 | if (PIM_DEBUG_PIM_TRACE) { | |
81 | zlog_debug("%s: dr pri %u on interface %s", __PRETTY_FUNCTION__, | |
82 | dr_pri, ifp->name); | |
83 | } | |
84 | ||
85 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { | |
86 | if (PIM_DEBUG_PIM_TRACE) { | |
87 | zlog_info("%s: neigh pri %u addr %x if dr addr %x", | |
88 | __PRETTY_FUNCTION__, neigh->dr_priority, | |
89 | ntohl(neigh->source_addr.s_addr), | |
90 | ntohl(pim_ifp->pim_dr_addr.s_addr)); | |
91 | } | |
92 | if ((neigh->dr_priority > dr_pri) | |
93 | || ((neigh->dr_priority == dr_pri) | |
94 | && (ntohl(neigh->source_addr.s_addr) | |
95 | > ntohl(pim_ifp->pim_dr_addr.s_addr)))) { | |
96 | pim_ifp->pim_dr_addr = neigh->source_addr; | |
97 | dr_pri = neigh->dr_priority; | |
98 | } | |
99 | } | |
12e41d03 DL |
100 | } |
101 | ||
102 | /* | |
103 | RFC 4601: 4.3.2. DR Election | |
104 | ||
105 | A router's idea of the current DR on an interface can change when a | |
106 | PIM Hello message is received, when a neighbor times out, or when a | |
107 | router's own DR Priority changes. | |
108 | */ | |
dedccda6 | 109 | int pim_if_dr_election(struct interface *ifp) |
12e41d03 | 110 | { |
d62a17ae | 111 | struct pim_interface *pim_ifp = ifp->info; |
112 | struct in_addr old_dr_addr; | |
113 | ||
114 | ++pim_ifp->pim_dr_election_count; | |
115 | ||
116 | old_dr_addr = pim_ifp->pim_dr_addr; | |
117 | ||
118 | if (pim_ifp->pim_dr_num_nondrpri_neighbors) { | |
119 | dr_election_by_addr(ifp); | |
120 | } else { | |
121 | dr_election_by_pri(ifp); | |
122 | } | |
123 | ||
124 | /* DR changed ? */ | |
125 | if (old_dr_addr.s_addr != pim_ifp->pim_dr_addr.s_addr) { | |
126 | ||
127 | if (PIM_DEBUG_PIM_EVENTS) { | |
128 | char dr_old_str[INET_ADDRSTRLEN]; | |
129 | char dr_new_str[INET_ADDRSTRLEN]; | |
130 | pim_inet4_dump("<old_dr?>", old_dr_addr, dr_old_str, | |
131 | sizeof(dr_old_str)); | |
132 | pim_inet4_dump("<new_dr?>", pim_ifp->pim_dr_addr, | |
133 | dr_new_str, sizeof(dr_new_str)); | |
134 | zlog_debug("%s: DR was %s now is %s on interface %s", | |
135 | __PRETTY_FUNCTION__, dr_old_str, dr_new_str, | |
136 | ifp->name); | |
137 | } | |
138 | ||
139 | pim_ifp->pim_dr_election_last = | |
140 | pim_time_monotonic_sec(); /* timestamp */ | |
141 | ++pim_ifp->pim_dr_election_changes; | |
142 | pim_if_update_join_desired(pim_ifp); | |
143 | pim_if_update_could_assert(ifp); | |
144 | pim_if_update_assert_tracking_desired(ifp); | |
145 | return 1; | |
146 | } | |
147 | ||
148 | return 0; | |
12e41d03 DL |
149 | } |
150 | ||
151 | static void update_dr_priority(struct pim_neighbor *neigh, | |
152 | pim_hello_options hello_options, | |
153 | uint32_t dr_priority) | |
154 | { | |
d62a17ae | 155 | pim_hello_options will_set_pri; /* boolean */ |
156 | pim_hello_options bit_flip; /* boolean */ | |
157 | pim_hello_options pri_change; /* boolean */ | |
158 | ||
159 | will_set_pri = | |
160 | PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_DR_PRIORITY); | |
161 | ||
162 | bit_flip = (will_set_pri | |
163 | != PIM_OPTION_IS_SET(neigh->hello_options, | |
164 | PIM_OPTION_MASK_DR_PRIORITY)); | |
165 | ||
166 | if (bit_flip) { | |
167 | struct pim_interface *pim_ifp = neigh->interface->info; | |
168 | ||
169 | /* update num. of neighbors without dr_pri */ | |
170 | ||
171 | if (will_set_pri) { | |
172 | --pim_ifp->pim_dr_num_nondrpri_neighbors; | |
173 | } else { | |
174 | ++pim_ifp->pim_dr_num_nondrpri_neighbors; | |
175 | } | |
176 | } | |
177 | ||
178 | pri_change = (bit_flip || (neigh->dr_priority != dr_priority)); | |
179 | ||
180 | if (will_set_pri) { | |
181 | neigh->dr_priority = dr_priority; | |
182 | } else { | |
183 | neigh->dr_priority = 0; /* cosmetic unset */ | |
184 | } | |
185 | ||
186 | if (pri_change) { | |
187 | /* | |
188 | RFC 4601: 4.3.2. DR Election | |
189 | ||
190 | A router's idea of the current DR on an interface can change | |
191 | when a | |
192 | PIM Hello message is received, when a neighbor times out, or | |
193 | when a | |
194 | router's own DR Priority changes. | |
195 | */ | |
196 | pim_if_dr_election( | |
197 | neigh->interface); // router's own DR Priority changes | |
198 | } | |
12e41d03 DL |
199 | } |
200 | ||
201 | static int on_neighbor_timer(struct thread *t) | |
202 | { | |
d62a17ae | 203 | struct pim_neighbor *neigh; |
204 | struct interface *ifp; | |
205 | char msg[100]; | |
206 | ||
207 | neigh = THREAD_ARG(t); | |
208 | ||
209 | ifp = neigh->interface; | |
210 | ||
211 | if (PIM_DEBUG_PIM_TRACE) { | |
212 | char src_str[INET_ADDRSTRLEN]; | |
213 | pim_inet4_dump("<src?>", neigh->source_addr, src_str, | |
214 | sizeof(src_str)); | |
215 | zlog_debug( | |
216 | "Expired %d sec holdtime for neighbor %s on interface %s", | |
217 | neigh->holdtime, src_str, ifp->name); | |
218 | } | |
219 | ||
220 | snprintf(msg, sizeof(msg), "%d-sec holdtime expired", neigh->holdtime); | |
221 | pim_neighbor_delete(ifp, neigh, msg); | |
222 | ||
223 | /* | |
224 | RFC 4601: 4.3.2. DR Election | |
225 | ||
226 | A router's idea of the current DR on an interface can change when a | |
227 | PIM Hello message is received, when a neighbor times out, or when a | |
228 | router's own DR Priority changes. | |
229 | */ | |
230 | pim_if_dr_election(ifp); // neighbor times out | |
231 | ||
232 | return 0; | |
12e41d03 DL |
233 | } |
234 | ||
12e41d03 DL |
235 | void pim_neighbor_timer_reset(struct pim_neighbor *neigh, uint16_t holdtime) |
236 | { | |
d62a17ae | 237 | neigh->holdtime = holdtime; |
238 | ||
239 | THREAD_OFF(neigh->t_expire_timer); | |
240 | ||
241 | /* | |
242 | 0xFFFF is request for no holdtime | |
243 | */ | |
244 | if (neigh->holdtime == 0xFFFF) { | |
245 | return; | |
246 | } | |
247 | ||
248 | if (PIM_DEBUG_PIM_TRACE_DETAIL) { | |
249 | char src_str[INET_ADDRSTRLEN]; | |
250 | pim_inet4_dump("<src?>", neigh->source_addr, src_str, | |
251 | sizeof(src_str)); | |
252 | zlog_debug("%s: starting %u sec timer for neighbor %s on %s", | |
253 | __PRETTY_FUNCTION__, neigh->holdtime, src_str, | |
254 | neigh->interface->name); | |
255 | } | |
256 | ||
257 | thread_add_timer(master, on_neighbor_timer, neigh, neigh->holdtime, | |
258 | &neigh->t_expire_timer); | |
12e41d03 DL |
259 | } |
260 | ||
d62a17ae | 261 | static int on_neighbor_jp_timer(struct thread *t) |
982bff89 | 262 | { |
d62a17ae | 263 | struct pim_neighbor *neigh = THREAD_ARG(t); |
264 | struct pim_rpf rpf; | |
265 | ||
266 | if (PIM_DEBUG_PIM_TRACE) { | |
267 | char src_str[INET_ADDRSTRLEN]; | |
268 | pim_inet4_dump("<src?>", neigh->source_addr, src_str, | |
269 | sizeof(src_str)); | |
270 | zlog_debug("%s:Sending JP Agg to %s on %s with %d groups", | |
271 | __PRETTY_FUNCTION__, src_str, neigh->interface->name, | |
272 | neigh->upstream_jp_agg->count); | |
273 | } | |
982bff89 | 274 | |
d62a17ae | 275 | rpf.source_nexthop.interface = neigh->interface; |
276 | rpf.rpf_addr.u.prefix4 = neigh->source_addr; | |
277 | pim_joinprune_send(&rpf, neigh->upstream_jp_agg); | |
982bff89 | 278 | |
d62a17ae | 279 | thread_add_timer(master, on_neighbor_jp_timer, neigh, qpim_t_periodic, |
280 | &neigh->jp_timer); | |
982bff89 | 281 | |
d62a17ae | 282 | return 0; |
982bff89 DS |
283 | } |
284 | ||
d62a17ae | 285 | static void pim_neighbor_start_jp_timer(struct pim_neighbor *neigh) |
982bff89 | 286 | { |
d62a17ae | 287 | THREAD_TIMER_OFF(neigh->jp_timer); |
288 | thread_add_timer(master, on_neighbor_jp_timer, neigh, qpim_t_periodic, | |
289 | &neigh->jp_timer); | |
982bff89 DS |
290 | } |
291 | ||
d62a17ae | 292 | static struct pim_neighbor * |
293 | pim_neighbor_new(struct interface *ifp, struct in_addr source_addr, | |
294 | pim_hello_options hello_options, uint16_t holdtime, | |
295 | uint16_t propagation_delay, uint16_t override_interval, | |
296 | uint32_t dr_priority, uint32_t generation_id, | |
297 | struct list *addr_list) | |
12e41d03 | 298 | { |
d62a17ae | 299 | struct pim_interface *pim_ifp; |
300 | struct pim_neighbor *neigh; | |
301 | char src_str[INET_ADDRSTRLEN]; | |
302 | ||
303 | zassert(ifp); | |
304 | pim_ifp = ifp->info; | |
305 | zassert(pim_ifp); | |
306 | ||
307 | neigh = XCALLOC(MTYPE_PIM_NEIGHBOR, sizeof(*neigh)); | |
308 | if (!neigh) { | |
309 | zlog_err("%s: PIM XCALLOC(%zu) failure", __PRETTY_FUNCTION__, | |
310 | sizeof(*neigh)); | |
311 | return 0; | |
312 | } | |
313 | ||
314 | neigh->creation = pim_time_monotonic_sec(); | |
315 | neigh->source_addr = source_addr; | |
316 | neigh->hello_options = hello_options; | |
317 | neigh->propagation_delay_msec = propagation_delay; | |
318 | neigh->override_interval_msec = override_interval; | |
319 | neigh->dr_priority = dr_priority; | |
320 | neigh->generation_id = generation_id; | |
321 | neigh->prefix_list = addr_list; | |
322 | neigh->t_expire_timer = NULL; | |
323 | neigh->interface = ifp; | |
324 | ||
325 | neigh->upstream_jp_agg = list_new(); | |
326 | neigh->upstream_jp_agg->cmp = pim_jp_agg_group_list_cmp; | |
327 | neigh->upstream_jp_agg->del = | |
328 | (void (*)(void *))pim_jp_agg_group_list_free; | |
329 | pim_neighbor_start_jp_timer(neigh); | |
330 | ||
331 | pim_neighbor_timer_reset(neigh, holdtime); | |
332 | /* | |
333 | * The pim_ifstat_hello_sent variable is used to decide if | |
334 | * we should expedite a hello out the interface. If we | |
335 | * establish a new neighbor, we unfortunately need to | |
336 | * reset the value so that we can know to hurry up and | |
337 | * hello | |
338 | */ | |
339 | pim_ifp->pim_ifstat_hello_sent = 0; | |
340 | ||
341 | pim_inet4_dump("<src?>", source_addr, src_str, sizeof(src_str)); | |
342 | ||
343 | if (PIM_DEBUG_PIM_EVENTS) { | |
344 | zlog_debug("%s: creating PIM neighbor %s on interface %s", | |
345 | __PRETTY_FUNCTION__, src_str, ifp->name); | |
346 | } | |
347 | ||
348 | zlog_info("PIM NEIGHBOR UP: neighbor %s on interface %s", src_str, | |
349 | ifp->name); | |
350 | ||
351 | if (neigh->propagation_delay_msec | |
352 | > pim_ifp->pim_neighbors_highest_propagation_delay_msec) { | |
353 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = | |
354 | neigh->propagation_delay_msec; | |
355 | } | |
356 | if (neigh->override_interval_msec | |
357 | > pim_ifp->pim_neighbors_highest_override_interval_msec) { | |
358 | pim_ifp->pim_neighbors_highest_override_interval_msec = | |
359 | neigh->override_interval_msec; | |
360 | } | |
361 | ||
362 | if (!PIM_OPTION_IS_SET(neigh->hello_options, | |
363 | PIM_OPTION_MASK_LAN_PRUNE_DELAY)) { | |
364 | /* update num. of neighbors without hello option lan_delay */ | |
365 | ++pim_ifp->pim_number_of_nonlandelay_neighbors; | |
366 | } | |
367 | ||
368 | if (!PIM_OPTION_IS_SET(neigh->hello_options, | |
369 | PIM_OPTION_MASK_DR_PRIORITY)) { | |
370 | /* update num. of neighbors without hello option dr_pri */ | |
371 | ++pim_ifp->pim_dr_num_nondrpri_neighbors; | |
372 | } | |
373 | ||
374 | // Register PIM Neighbor with BFD | |
375 | pim_bfd_trigger_event(pim_ifp, neigh, 1); | |
376 | ||
377 | return neigh; | |
12e41d03 DL |
378 | } |
379 | ||
380 | static void delete_prefix_list(struct pim_neighbor *neigh) | |
381 | { | |
d62a17ae | 382 | if (neigh->prefix_list) { |
12e41d03 DL |
383 | |
384 | #ifdef DUMP_PREFIX_LIST | |
d62a17ae | 385 | struct listnode *p_node; |
386 | struct prefix *p; | |
387 | char addr_str[10]; | |
388 | int list_size = neigh->prefix_list | |
389 | ? (int)listcount(neigh->prefix_list) | |
390 | : -1; | |
391 | int i = 0; | |
392 | for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, p_node, p)) { | |
393 | pim_inet4_dump("<addr?>", p->u.prefix4, addr_str, | |
394 | sizeof(addr_str)); | |
395 | zlog_debug( | |
396 | "%s: DUMP_PREFIX_LIST neigh=%x prefix_list=%x prefix=%x addr=%s [%d/%d]", | |
397 | __PRETTY_FUNCTION__, (unsigned)neigh, | |
398 | (unsigned)neigh->prefix_list, (unsigned)p, | |
399 | addr_str, i, list_size); | |
400 | ++i; | |
401 | } | |
12e41d03 DL |
402 | #endif |
403 | ||
affe9e99 | 404 | list_delete_and_null(&neigh->prefix_list); |
d62a17ae | 405 | } |
12e41d03 DL |
406 | } |
407 | ||
408 | void pim_neighbor_free(struct pim_neighbor *neigh) | |
409 | { | |
d62a17ae | 410 | zassert(!neigh->t_expire_timer); |
12e41d03 | 411 | |
d62a17ae | 412 | delete_prefix_list(neigh); |
12e41d03 | 413 | |
affe9e99 | 414 | list_delete_and_null(&neigh->upstream_jp_agg); |
d62a17ae | 415 | THREAD_OFF(neigh->jp_timer); |
982bff89 | 416 | |
d62a17ae | 417 | XFREE(MTYPE_PIM_NEIGHBOR, neigh); |
12e41d03 DL |
418 | } |
419 | ||
d62a17ae | 420 | struct pim_neighbor *pim_neighbor_find_by_secondary(struct interface *ifp, |
421 | struct prefix *src) | |
07b17d59 | 422 | { |
d62a17ae | 423 | struct pim_interface *pim_ifp; |
424 | struct listnode *node, *pnode; | |
425 | struct pim_neighbor *neigh; | |
426 | struct prefix *p; | |
427 | ||
428 | pim_ifp = ifp->info; | |
429 | if (!pim_ifp) | |
430 | return NULL; | |
431 | ||
432 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { | |
433 | for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, pnode, p)) { | |
434 | if (prefix_same(p, src)) | |
435 | return neigh; | |
436 | } | |
437 | } | |
438 | ||
439 | return NULL; | |
07b17d59 DS |
440 | } |
441 | ||
12e41d03 DL |
442 | struct pim_neighbor *pim_neighbor_find(struct interface *ifp, |
443 | struct in_addr source_addr) | |
444 | { | |
d62a17ae | 445 | struct pim_interface *pim_ifp; |
446 | struct listnode *node; | |
447 | struct pim_neighbor *neigh; | |
12e41d03 | 448 | |
d62a17ae | 449 | if (!ifp) |
450 | return NULL; | |
1131c2eb | 451 | |
d62a17ae | 452 | pim_ifp = ifp->info; |
453 | if (!pim_ifp) | |
454 | return NULL; | |
12e41d03 | 455 | |
d62a17ae | 456 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { |
457 | if (source_addr.s_addr == neigh->source_addr.s_addr) { | |
458 | return neigh; | |
459 | } | |
460 | } | |
12e41d03 | 461 | |
d62a17ae | 462 | return NULL; |
12e41d03 DL |
463 | } |
464 | ||
99deb321 DS |
465 | /* |
466 | * Find the *one* interface out | |
467 | * this interface. If more than | |
468 | * one return NULL | |
469 | */ | |
d62a17ae | 470 | struct pim_neighbor *pim_neighbor_find_if(struct interface *ifp) |
99deb321 | 471 | { |
d62a17ae | 472 | struct pim_interface *pim_ifp = ifp->info; |
99deb321 | 473 | |
d62a17ae | 474 | if (!pim_ifp || pim_ifp->pim_neighbor_list->count != 1) |
475 | return NULL; | |
99deb321 | 476 | |
d62a17ae | 477 | return listnode_head(pim_ifp->pim_neighbor_list); |
99deb321 DS |
478 | } |
479 | ||
d62a17ae | 480 | struct pim_neighbor * |
481 | pim_neighbor_add(struct interface *ifp, struct in_addr source_addr, | |
482 | pim_hello_options hello_options, uint16_t holdtime, | |
483 | uint16_t propagation_delay, uint16_t override_interval, | |
484 | uint32_t dr_priority, uint32_t generation_id, | |
485 | struct list *addr_list, int send_hello_now) | |
12e41d03 | 486 | { |
d62a17ae | 487 | struct pim_interface *pim_ifp; |
488 | struct pim_neighbor *neigh; | |
489 | ||
490 | neigh = pim_neighbor_new(ifp, source_addr, hello_options, holdtime, | |
491 | propagation_delay, override_interval, | |
492 | dr_priority, generation_id, addr_list); | |
493 | if (!neigh) { | |
494 | return 0; | |
495 | } | |
12e41d03 | 496 | |
d62a17ae | 497 | pim_ifp = ifp->info; |
498 | zassert(pim_ifp); | |
12e41d03 | 499 | |
d62a17ae | 500 | listnode_add(pim_ifp->pim_neighbor_list, neigh); |
12e41d03 | 501 | |
d62a17ae | 502 | if (PIM_DEBUG_PIM_TRACE_DETAIL) { |
503 | char str[INET_ADDRSTRLEN]; | |
504 | pim_inet4_dump("<nht_nbr?>", source_addr, str, sizeof(str)); | |
505 | zlog_debug("%s: neighbor %s added ", __PRETTY_FUNCTION__, str); | |
506 | } | |
507 | /* | |
508 | RFC 4601: 4.3.2. DR Election | |
509 | ||
510 | A router's idea of the current DR on an interface can change when a | |
511 | PIM Hello message is received, when a neighbor times out, or when a | |
512 | router's own DR Priority changes. | |
513 | */ | |
514 | pim_if_dr_election(neigh->interface); // new neighbor -- should not | |
515 | // trigger dr election... | |
516 | ||
517 | /* | |
518 | RFC 4601: 4.3.1. Sending Hello Messages | |
519 | ||
520 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
521 | when a Hello message is received from a new neighbor, or a Hello | |
522 | message with a new GenID is received from an existing neighbor, a | |
523 | new Hello message should be sent on this interface after a | |
524 | randomized delay between 0 and Triggered_Hello_Delay. | |
525 | ||
526 | This is a bit silly to do it that way. If I get a new | |
527 | genid we need to send the hello *now* because we've | |
528 | lined up a bunch of join/prune messages to go out the | |
529 | interface. | |
530 | */ | |
531 | if (send_hello_now) | |
532 | pim_hello_restart_now(ifp); | |
533 | else | |
534 | pim_hello_restart_triggered(neigh->interface); | |
535 | ||
9b29ea95 | 536 | pim_upstream_find_new_rpf(pim_ifp->pim); |
d62a17ae | 537 | |
538 | /* RNH can send nexthop update prior to PIM neibhor UP | |
539 | in that case nexthop cache would not consider this neighbor | |
540 | as RPF. | |
541 | Upon PIM neighbor UP, iterate all RPs and update | |
542 | nexthop cache with this neighbor. | |
543 | */ | |
fec883d9 | 544 | pim_resolve_rp_nh(pim_ifp->pim); |
d62a17ae | 545 | |
fec883d9 | 546 | pim_rp_setup(pim_ifp->pim); |
d62a17ae | 547 | |
da11e325 | 548 | sched_rpf_cache_refresh(pim_ifp->pim); |
d62a17ae | 549 | return neigh; |
12e41d03 DL |
550 | } |
551 | ||
d62a17ae | 552 | static uint16_t find_neighbors_next_highest_propagation_delay_msec( |
553 | struct interface *ifp, struct pim_neighbor *highest_neigh) | |
12e41d03 | 554 | { |
d62a17ae | 555 | struct pim_interface *pim_ifp; |
556 | struct listnode *neigh_node; | |
557 | struct pim_neighbor *neigh; | |
558 | uint16_t next_highest_delay_msec; | |
559 | ||
560 | pim_ifp = ifp->info; | |
561 | zassert(pim_ifp); | |
562 | ||
563 | next_highest_delay_msec = pim_ifp->pim_propagation_delay_msec; | |
564 | ||
565 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, neigh_node, | |
566 | neigh)) { | |
567 | if (neigh == highest_neigh) | |
568 | continue; | |
569 | if (neigh->propagation_delay_msec > next_highest_delay_msec) | |
570 | next_highest_delay_msec = neigh->propagation_delay_msec; | |
571 | } | |
12e41d03 | 572 | |
d62a17ae | 573 | return next_highest_delay_msec; |
574 | } | |
12e41d03 | 575 | |
d62a17ae | 576 | static uint16_t find_neighbors_next_highest_override_interval_msec( |
577 | struct interface *ifp, struct pim_neighbor *highest_neigh) | |
578 | { | |
579 | struct pim_interface *pim_ifp; | |
580 | struct listnode *neigh_node; | |
581 | struct pim_neighbor *neigh; | |
582 | uint16_t next_highest_interval_msec; | |
583 | ||
584 | pim_ifp = ifp->info; | |
585 | zassert(pim_ifp); | |
586 | ||
587 | next_highest_interval_msec = pim_ifp->pim_override_interval_msec; | |
588 | ||
589 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, neigh_node, | |
590 | neigh)) { | |
591 | if (neigh == highest_neigh) | |
592 | continue; | |
593 | if (neigh->override_interval_msec > next_highest_interval_msec) | |
594 | next_highest_interval_msec = | |
595 | neigh->override_interval_msec; | |
596 | } | |
12e41d03 | 597 | |
d62a17ae | 598 | return next_highest_interval_msec; |
12e41d03 DL |
599 | } |
600 | ||
d62a17ae | 601 | void pim_neighbor_delete(struct interface *ifp, struct pim_neighbor *neigh, |
12e41d03 DL |
602 | const char *delete_message) |
603 | { | |
d62a17ae | 604 | struct pim_interface *pim_ifp; |
605 | char src_str[INET_ADDRSTRLEN]; | |
12e41d03 | 606 | |
d62a17ae | 607 | pim_ifp = ifp->info; |
608 | zassert(pim_ifp); | |
12e41d03 | 609 | |
d62a17ae | 610 | pim_inet4_dump("<src?>", neigh->source_addr, src_str, sizeof(src_str)); |
611 | zlog_info("PIM NEIGHBOR DOWN: neighbor %s on interface %s: %s", src_str, | |
612 | ifp->name, delete_message); | |
12e41d03 | 613 | |
d62a17ae | 614 | THREAD_OFF(neigh->t_expire_timer); |
12e41d03 | 615 | |
d62a17ae | 616 | pim_if_assert_on_neighbor_down(ifp, neigh->source_addr); |
12e41d03 | 617 | |
d62a17ae | 618 | if (!PIM_OPTION_IS_SET(neigh->hello_options, |
619 | PIM_OPTION_MASK_LAN_PRUNE_DELAY)) { | |
620 | /* update num. of neighbors without hello option lan_delay */ | |
12e41d03 | 621 | |
d62a17ae | 622 | --pim_ifp->pim_number_of_nonlandelay_neighbors; |
623 | } | |
12e41d03 | 624 | |
d62a17ae | 625 | if (!PIM_OPTION_IS_SET(neigh->hello_options, |
626 | PIM_OPTION_MASK_DR_PRIORITY)) { | |
627 | /* update num. of neighbors without dr_pri */ | |
12e41d03 | 628 | |
d62a17ae | 629 | --pim_ifp->pim_dr_num_nondrpri_neighbors; |
630 | } | |
12e41d03 | 631 | |
d62a17ae | 632 | zassert(neigh->propagation_delay_msec |
633 | <= pim_ifp->pim_neighbors_highest_propagation_delay_msec); | |
634 | zassert(neigh->override_interval_msec | |
635 | <= pim_ifp->pim_neighbors_highest_override_interval_msec); | |
636 | ||
637 | if (pim_if_lan_delay_enabled(ifp)) { | |
638 | ||
639 | /* will delete a neighbor with highest propagation delay? */ | |
640 | if (neigh->propagation_delay_msec | |
641 | == pim_ifp->pim_neighbors_highest_propagation_delay_msec) { | |
642 | /* then find the next highest propagation delay */ | |
643 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = | |
644 | find_neighbors_next_highest_propagation_delay_msec( | |
645 | ifp, neigh); | |
646 | } | |
647 | ||
648 | /* will delete a neighbor with highest override interval? */ | |
649 | if (neigh->override_interval_msec | |
650 | == pim_ifp->pim_neighbors_highest_override_interval_msec) { | |
651 | /* then find the next highest propagation delay */ | |
652 | pim_ifp->pim_neighbors_highest_override_interval_msec = | |
653 | find_neighbors_next_highest_override_interval_msec( | |
654 | ifp, neigh); | |
655 | } | |
656 | } | |
12e41d03 | 657 | |
d62a17ae | 658 | if (PIM_DEBUG_PIM_TRACE) { |
659 | zlog_debug("%s: deleting PIM neighbor %s on interface %s", | |
660 | __PRETTY_FUNCTION__, src_str, ifp->name); | |
661 | } | |
12e41d03 | 662 | |
d62a17ae | 663 | // De-Register PIM Neighbor with BFD |
664 | pim_bfd_trigger_event(pim_ifp, neigh, 0); | |
ba4eb1bc | 665 | |
d62a17ae | 666 | listnode_delete(pim_ifp->pim_neighbor_list, neigh); |
12e41d03 | 667 | |
d62a17ae | 668 | pim_neighbor_free(neigh); |
da72c9fd | 669 | |
da11e325 | 670 | sched_rpf_cache_refresh(pim_ifp->pim); |
12e41d03 DL |
671 | } |
672 | ||
d62a17ae | 673 | void pim_neighbor_delete_all(struct interface *ifp, const char *delete_message) |
12e41d03 | 674 | { |
d62a17ae | 675 | struct pim_interface *pim_ifp; |
676 | struct listnode *neigh_node; | |
677 | struct listnode *neigh_nextnode; | |
678 | struct pim_neighbor *neigh; | |
679 | ||
680 | pim_ifp = ifp->info; | |
681 | zassert(pim_ifp); | |
682 | ||
683 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_neighbor_list, neigh_node, | |
684 | neigh_nextnode, neigh)) { | |
685 | pim_neighbor_delete(ifp, neigh, delete_message); | |
686 | } | |
12e41d03 DL |
687 | } |
688 | ||
689 | struct prefix *pim_neighbor_find_secondary(struct pim_neighbor *neigh, | |
07b17d59 | 690 | struct prefix *addr) |
12e41d03 | 691 | { |
d62a17ae | 692 | struct listnode *node; |
693 | struct prefix *p; | |
12e41d03 | 694 | |
d62a17ae | 695 | if (!neigh->prefix_list) |
696 | return 0; | |
12e41d03 | 697 | |
d62a17ae | 698 | for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, node, p)) { |
699 | if (prefix_same(p, addr)) | |
700 | return p; | |
701 | } | |
12e41d03 | 702 | |
d62a17ae | 703 | return NULL; |
12e41d03 DL |
704 | } |
705 | ||
706 | /* | |
707 | RFC 4601: 4.3.4. Maintaining Secondary Address Lists | |
d62a17ae | 708 | |
12e41d03 DL |
709 | All the advertised secondary addresses in received Hello messages |
710 | must be checked against those previously advertised by all other | |
711 | PIM neighbors on that interface. If there is a conflict and the | |
712 | same secondary address was previously advertised by another | |
713 | neighbor, then only the most recently received mapping MUST be | |
714 | maintained, and an error message SHOULD be logged to the | |
715 | administrator in a rate-limited manner. | |
716 | */ | |
717 | static void delete_from_neigh_addr(struct interface *ifp, | |
718 | struct list *addr_list, | |
719 | struct in_addr neigh_addr) | |
720 | { | |
d62a17ae | 721 | struct listnode *addr_node; |
722 | struct prefix *addr; | |
723 | struct pim_interface *pim_ifp; | |
724 | ||
725 | pim_ifp = ifp->info; | |
726 | zassert(pim_ifp); | |
727 | ||
728 | zassert(addr_list); | |
729 | ||
730 | /* | |
731 | Scan secondary address list | |
732 | */ | |
733 | for (ALL_LIST_ELEMENTS_RO(addr_list, addr_node, addr)) { | |
734 | struct listnode *neigh_node; | |
735 | struct pim_neighbor *neigh; | |
736 | ||
737 | if (addr->family != AF_INET) | |
738 | continue; | |
739 | ||
740 | /* | |
741 | Scan neighbors | |
742 | */ | |
743 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, | |
744 | neigh_node, neigh)) { | |
745 | { | |
746 | struct prefix *p = pim_neighbor_find_secondary( | |
747 | neigh, addr); | |
748 | if (p) { | |
749 | char addr_str[INET_ADDRSTRLEN]; | |
750 | char this_neigh_str[INET_ADDRSTRLEN]; | |
751 | char other_neigh_str[INET_ADDRSTRLEN]; | |
752 | ||
753 | pim_inet4_dump( | |
754 | "<addr?>", addr->u.prefix4, | |
755 | addr_str, sizeof(addr_str)); | |
756 | pim_inet4_dump("<neigh1?>", neigh_addr, | |
757 | this_neigh_str, | |
758 | sizeof(this_neigh_str)); | |
759 | pim_inet4_dump("<neigh2?>", | |
760 | neigh->source_addr, | |
761 | other_neigh_str, | |
762 | sizeof(other_neigh_str)); | |
763 | ||
764 | zlog_info( | |
765 | "secondary addr %s recvd from neigh %s deleted from neigh %s on %s", | |
766 | addr_str, this_neigh_str, | |
767 | other_neigh_str, ifp->name); | |
768 | ||
769 | listnode_delete(neigh->prefix_list, p); | |
770 | prefix_free(p); | |
771 | } | |
772 | } | |
773 | ||
774 | } /* scan neighbors */ | |
775 | ||
776 | } /* scan addr list */ | |
12e41d03 DL |
777 | } |
778 | ||
779 | void pim_neighbor_update(struct pim_neighbor *neigh, | |
d62a17ae | 780 | pim_hello_options hello_options, uint16_t holdtime, |
781 | uint32_t dr_priority, struct list *addr_list) | |
12e41d03 | 782 | { |
d62a17ae | 783 | struct pim_interface *pim_ifp = neigh->interface->info; |
784 | ||
785 | /* Received holdtime ? */ | |
786 | if (PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_HOLDTIME)) { | |
787 | pim_neighbor_timer_reset(neigh, holdtime); | |
788 | } else { | |
789 | pim_neighbor_timer_reset(neigh, | |
790 | PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
791 | } | |
12e41d03 DL |
792 | |
793 | #ifdef DUMP_PREFIX_LIST | |
d62a17ae | 794 | zlog_debug( |
795 | "%s: DUMP_PREFIX_LIST old_prefix_list=%x old_size=%d new_prefix_list=%x new_size=%d", | |
796 | __PRETTY_FUNCTION__, (unsigned)neigh->prefix_list, | |
797 | neigh->prefix_list ? (int)listcount(neigh->prefix_list) : -1, | |
798 | (unsigned)addr_list, | |
799 | addr_list ? (int)listcount(addr_list) : -1); | |
12e41d03 DL |
800 | #endif |
801 | ||
d62a17ae | 802 | if (neigh->prefix_list == addr_list) { |
803 | if (addr_list) { | |
804 | zlog_err( | |
805 | "%s: internal error: trying to replace same prefix list=%p", | |
806 | __PRETTY_FUNCTION__, (void *)addr_list); | |
807 | } | |
808 | } else { | |
809 | /* Delete existing secondary address list */ | |
810 | delete_prefix_list(neigh); | |
811 | } | |
812 | ||
813 | if (addr_list) { | |
814 | delete_from_neigh_addr(neigh->interface, addr_list, | |
815 | neigh->source_addr); | |
816 | } | |
817 | ||
818 | /* Replace secondary address list */ | |
819 | neigh->prefix_list = addr_list; | |
820 | ||
821 | update_dr_priority(neigh, hello_options, dr_priority); | |
822 | /* | |
823 | Copy flags | |
824 | */ | |
825 | neigh->hello_options = hello_options; | |
12e41d03 | 826 | } |