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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" | |
3613d898 | 28 | #include "lib_errors.h" |
12e41d03 DL |
29 | |
30 | #include "pimd.h" | |
993e3d8e | 31 | #include "pim_instance.h" |
12e41d03 DL |
32 | #include "pim_neighbor.h" |
33 | #include "pim_time.h" | |
34 | #include "pim_str.h" | |
35 | #include "pim_iface.h" | |
36 | #include "pim_pim.h" | |
37 | #include "pim_upstream.h" | |
38 | #include "pim_ifchannel.h" | |
e446de6a | 39 | #include "pim_rp.h" |
da72c9fd | 40 | #include "pim_zebra.h" |
982bff89 DS |
41 | #include "pim_join.h" |
42 | #include "pim_jp_agg.h" | |
ba4eb1bc | 43 | #include "pim_bfd.h" |
46a9ea8b | 44 | #include "pim_register.h" |
12e41d03 DL |
45 | |
46 | static void dr_election_by_addr(struct interface *ifp) | |
47 | { | |
d62a17ae | 48 | struct pim_interface *pim_ifp; |
49 | struct listnode *node; | |
50 | struct pim_neighbor *neigh; | |
51 | ||
52 | pim_ifp = ifp->info; | |
df5dfb77 | 53 | assert(pim_ifp); |
d62a17ae | 54 | |
55 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
56 | ||
57 | if (PIM_DEBUG_PIM_TRACE) { | |
5e81f5dd | 58 | zlog_debug("%s: on interface %s", __func__, ifp->name); |
d62a17ae | 59 | } |
60 | ||
61 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { | |
9bb93fa0 | 62 | if (pim_addr_cmp(neigh->source_addr, pim_ifp->pim_dr_addr) > 0) |
d62a17ae | 63 | pim_ifp->pim_dr_addr = neigh->source_addr; |
d62a17ae | 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; | |
df5dfb77 | 75 | assert(pim_ifp); |
d62a17ae | 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) { | |
5e81f5dd DS |
81 | zlog_debug("%s: dr pri %u on interface %s", __func__, dr_pri, |
82 | ifp->name); | |
d62a17ae | 83 | } |
84 | ||
85 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { | |
86 | if (PIM_DEBUG_PIM_TRACE) { | |
9bb93fa0 | 87 | zlog_info("%s: neigh pri %u addr %pPA if dr addr %pPA", |
5e81f5dd | 88 | __func__, neigh->dr_priority, |
9bb93fa0 | 89 | &neigh->source_addr, &pim_ifp->pim_dr_addr); |
d62a17ae | 90 | } |
9bb93fa0 DL |
91 | if ((neigh->dr_priority > dr_pri) || |
92 | ((neigh->dr_priority == dr_pri) && | |
93 | (pim_addr_cmp(neigh->source_addr, pim_ifp->pim_dr_addr) > | |
94 | 0))) { | |
d62a17ae | 95 | pim_ifp->pim_dr_addr = neigh->source_addr; |
96 | dr_pri = neigh->dr_priority; | |
97 | } | |
98 | } | |
12e41d03 DL |
99 | } |
100 | ||
101 | /* | |
102 | RFC 4601: 4.3.2. DR Election | |
103 | ||
104 | A router's idea of the current DR on an interface can change when a | |
105 | PIM Hello message is received, when a neighbor times out, or when a | |
106 | router's own DR Priority changes. | |
107 | */ | |
dedccda6 | 108 | int pim_if_dr_election(struct interface *ifp) |
12e41d03 | 109 | { |
d62a17ae | 110 | struct pim_interface *pim_ifp = ifp->info; |
034db86b | 111 | pim_addr old_dr_addr; |
d62a17ae | 112 | |
113 | ++pim_ifp->pim_dr_election_count; | |
114 | ||
115 | old_dr_addr = pim_ifp->pim_dr_addr; | |
116 | ||
117 | if (pim_ifp->pim_dr_num_nondrpri_neighbors) { | |
118 | dr_election_by_addr(ifp); | |
119 | } else { | |
120 | dr_election_by_pri(ifp); | |
121 | } | |
122 | ||
123 | /* DR changed ? */ | |
034db86b DL |
124 | if (pim_addr_cmp(old_dr_addr, pim_ifp->pim_dr_addr)) { |
125 | ||
126 | if (PIM_DEBUG_PIM_EVENTS) | |
127 | zlog_debug( | |
128 | "%s: DR was %pPA now is %pPA on interface %s", | |
129 | __func__, &old_dr_addr, &pim_ifp->pim_dr_addr, | |
130 | ifp->name); | |
d62a17ae | 131 | |
132 | pim_ifp->pim_dr_election_last = | |
133 | pim_time_monotonic_sec(); /* timestamp */ | |
134 | ++pim_ifp->pim_dr_election_changes; | |
135 | pim_if_update_join_desired(pim_ifp); | |
136 | pim_if_update_could_assert(ifp); | |
137 | pim_if_update_assert_tracking_desired(ifp); | |
46a9ea8b | 138 | |
139 | if (PIM_I_am_DR(pim_ifp)) | |
140 | pim_ifp->am_i_dr = true; | |
141 | else { | |
142 | if (pim_ifp->am_i_dr == true) { | |
143 | pim_reg_del_on_couldreg_fail(ifp); | |
144 | pim_ifp->am_i_dr = false; | |
145 | } | |
146 | } | |
147 | ||
d62a17ae | 148 | return 1; |
149 | } | |
150 | ||
151 | return 0; | |
12e41d03 DL |
152 | } |
153 | ||
154 | static void update_dr_priority(struct pim_neighbor *neigh, | |
155 | pim_hello_options hello_options, | |
156 | uint32_t dr_priority) | |
157 | { | |
d62a17ae | 158 | pim_hello_options will_set_pri; /* boolean */ |
159 | pim_hello_options bit_flip; /* boolean */ | |
160 | pim_hello_options pri_change; /* boolean */ | |
161 | ||
162 | will_set_pri = | |
163 | PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_DR_PRIORITY); | |
164 | ||
165 | bit_flip = (will_set_pri | |
166 | != PIM_OPTION_IS_SET(neigh->hello_options, | |
167 | PIM_OPTION_MASK_DR_PRIORITY)); | |
168 | ||
169 | if (bit_flip) { | |
170 | struct pim_interface *pim_ifp = neigh->interface->info; | |
171 | ||
172 | /* update num. of neighbors without dr_pri */ | |
173 | ||
174 | if (will_set_pri) { | |
175 | --pim_ifp->pim_dr_num_nondrpri_neighbors; | |
176 | } else { | |
177 | ++pim_ifp->pim_dr_num_nondrpri_neighbors; | |
178 | } | |
179 | } | |
180 | ||
181 | pri_change = (bit_flip || (neigh->dr_priority != dr_priority)); | |
182 | ||
183 | if (will_set_pri) { | |
184 | neigh->dr_priority = dr_priority; | |
185 | } else { | |
186 | neigh->dr_priority = 0; /* cosmetic unset */ | |
187 | } | |
188 | ||
189 | if (pri_change) { | |
190 | /* | |
191 | RFC 4601: 4.3.2. DR Election | |
192 | ||
193 | A router's idea of the current DR on an interface can change | |
194 | when a | |
195 | PIM Hello message is received, when a neighbor times out, or | |
196 | when a | |
197 | router's own DR Priority changes. | |
198 | */ | |
199 | pim_if_dr_election( | |
200 | neigh->interface); // router's own DR Priority changes | |
201 | } | |
12e41d03 DL |
202 | } |
203 | ||
cc9f21da | 204 | static void on_neighbor_timer(struct thread *t) |
12e41d03 | 205 | { |
d62a17ae | 206 | struct pim_neighbor *neigh; |
207 | struct interface *ifp; | |
208 | char msg[100]; | |
209 | ||
210 | neigh = THREAD_ARG(t); | |
211 | ||
212 | ifp = neigh->interface; | |
213 | ||
9bb93fa0 | 214 | if (PIM_DEBUG_PIM_TRACE) |
d62a17ae | 215 | zlog_debug( |
9bb93fa0 DL |
216 | "Expired %d sec holdtime for neighbor %pPA on interface %s", |
217 | neigh->holdtime, &neigh->source_addr, ifp->name); | |
d62a17ae | 218 | |
219 | snprintf(msg, sizeof(msg), "%d-sec holdtime expired", neigh->holdtime); | |
220 | pim_neighbor_delete(ifp, neigh, msg); | |
221 | ||
222 | /* | |
223 | RFC 4601: 4.3.2. DR Election | |
224 | ||
225 | A router's idea of the current DR on an interface can change when a | |
226 | PIM Hello message is received, when a neighbor times out, or when a | |
227 | router's own DR Priority changes. | |
228 | */ | |
229 | pim_if_dr_election(ifp); // neighbor times out | |
12e41d03 DL |
230 | } |
231 | ||
12e41d03 DL |
232 | void pim_neighbor_timer_reset(struct pim_neighbor *neigh, uint16_t holdtime) |
233 | { | |
d62a17ae | 234 | neigh->holdtime = holdtime; |
235 | ||
236 | THREAD_OFF(neigh->t_expire_timer); | |
237 | ||
238 | /* | |
239 | 0xFFFF is request for no holdtime | |
240 | */ | |
241 | if (neigh->holdtime == 0xFFFF) { | |
242 | return; | |
243 | } | |
244 | ||
9bb93fa0 DL |
245 | if (PIM_DEBUG_PIM_TRACE_DETAIL) |
246 | zlog_debug("%s: starting %u sec timer for neighbor %pPA on %s", | |
247 | __func__, neigh->holdtime, &neigh->source_addr, | |
d62a17ae | 248 | neigh->interface->name); |
d62a17ae | 249 | |
36417fcc DS |
250 | thread_add_timer(router->master, on_neighbor_timer, neigh, |
251 | neigh->holdtime, &neigh->t_expire_timer); | |
12e41d03 DL |
252 | } |
253 | ||
cc9f21da | 254 | static void on_neighbor_jp_timer(struct thread *t) |
982bff89 | 255 | { |
d62a17ae | 256 | struct pim_neighbor *neigh = THREAD_ARG(t); |
257 | struct pim_rpf rpf; | |
258 | ||
9bb93fa0 DL |
259 | if (PIM_DEBUG_PIM_TRACE) |
260 | zlog_debug("%s:Sending JP Agg to %pPA on %s with %d groups", | |
261 | __func__, &neigh->source_addr, | |
262 | neigh->interface->name, | |
d62a17ae | 263 | neigh->upstream_jp_agg->count); |
982bff89 | 264 | |
d62a17ae | 265 | rpf.source_nexthop.interface = neigh->interface; |
bad81cbc | 266 | rpf.rpf_addr = neigh->source_addr; |
d62a17ae | 267 | pim_joinprune_send(&rpf, neigh->upstream_jp_agg); |
982bff89 | 268 | |
36417fcc | 269 | thread_add_timer(router->master, on_neighbor_jp_timer, neigh, |
5b45753e | 270 | router->t_periodic, &neigh->jp_timer); |
982bff89 DS |
271 | } |
272 | ||
d62a17ae | 273 | static void pim_neighbor_start_jp_timer(struct pim_neighbor *neigh) |
982bff89 | 274 | { |
50478845 | 275 | THREAD_OFF(neigh->jp_timer); |
36417fcc | 276 | thread_add_timer(router->master, on_neighbor_jp_timer, neigh, |
5b45753e | 277 | router->t_periodic, &neigh->jp_timer); |
982bff89 DS |
278 | } |
279 | ||
d62a17ae | 280 | static struct pim_neighbor * |
9bb93fa0 | 281 | pim_neighbor_new(struct interface *ifp, pim_addr source_addr, |
d62a17ae | 282 | pim_hello_options hello_options, uint16_t holdtime, |
283 | uint16_t propagation_delay, uint16_t override_interval, | |
284 | uint32_t dr_priority, uint32_t generation_id, | |
285 | struct list *addr_list) | |
12e41d03 | 286 | { |
d62a17ae | 287 | struct pim_interface *pim_ifp; |
288 | struct pim_neighbor *neigh; | |
d62a17ae | 289 | |
df5dfb77 | 290 | assert(ifp); |
d62a17ae | 291 | pim_ifp = ifp->info; |
df5dfb77 | 292 | assert(pim_ifp); |
d62a17ae | 293 | |
294 | neigh = XCALLOC(MTYPE_PIM_NEIGHBOR, sizeof(*neigh)); | |
d62a17ae | 295 | |
296 | neigh->creation = pim_time_monotonic_sec(); | |
297 | neigh->source_addr = source_addr; | |
298 | neigh->hello_options = hello_options; | |
299 | neigh->propagation_delay_msec = propagation_delay; | |
300 | neigh->override_interval_msec = override_interval; | |
301 | neigh->dr_priority = dr_priority; | |
302 | neigh->generation_id = generation_id; | |
303 | neigh->prefix_list = addr_list; | |
304 | neigh->t_expire_timer = NULL; | |
305 | neigh->interface = ifp; | |
306 | ||
307 | neigh->upstream_jp_agg = list_new(); | |
308 | neigh->upstream_jp_agg->cmp = pim_jp_agg_group_list_cmp; | |
309 | neigh->upstream_jp_agg->del = | |
310 | (void (*)(void *))pim_jp_agg_group_list_free; | |
311 | pim_neighbor_start_jp_timer(neigh); | |
312 | ||
313 | pim_neighbor_timer_reset(neigh, holdtime); | |
314 | /* | |
315 | * The pim_ifstat_hello_sent variable is used to decide if | |
316 | * we should expedite a hello out the interface. If we | |
317 | * establish a new neighbor, we unfortunately need to | |
318 | * reset the value so that we can know to hurry up and | |
319 | * hello | |
320 | */ | |
79992e8a | 321 | PIM_IF_FLAG_UNSET_HELLO_SENT(pim_ifp->flags); |
d62a17ae | 322 | |
9bb93fa0 DL |
323 | if (PIM_DEBUG_PIM_EVENTS) |
324 | zlog_debug("%s: creating PIM neighbor %pPA on interface %s", | |
325 | __func__, &source_addr, ifp->name); | |
d62a17ae | 326 | |
9bb93fa0 DL |
327 | zlog_notice("PIM NEIGHBOR UP: neighbor %pPA on interface %s", |
328 | &source_addr, ifp->name); | |
d62a17ae | 329 | |
330 | if (neigh->propagation_delay_msec | |
331 | > pim_ifp->pim_neighbors_highest_propagation_delay_msec) { | |
332 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = | |
333 | neigh->propagation_delay_msec; | |
334 | } | |
335 | if (neigh->override_interval_msec | |
336 | > pim_ifp->pim_neighbors_highest_override_interval_msec) { | |
337 | pim_ifp->pim_neighbors_highest_override_interval_msec = | |
338 | neigh->override_interval_msec; | |
339 | } | |
340 | ||
341 | if (!PIM_OPTION_IS_SET(neigh->hello_options, | |
342 | PIM_OPTION_MASK_LAN_PRUNE_DELAY)) { | |
343 | /* update num. of neighbors without hello option lan_delay */ | |
344 | ++pim_ifp->pim_number_of_nonlandelay_neighbors; | |
345 | } | |
346 | ||
347 | if (!PIM_OPTION_IS_SET(neigh->hello_options, | |
348 | PIM_OPTION_MASK_DR_PRIORITY)) { | |
349 | /* update num. of neighbors without hello option dr_pri */ | |
350 | ++pim_ifp->pim_dr_num_nondrpri_neighbors; | |
351 | } | |
352 | ||
353 | // Register PIM Neighbor with BFD | |
1f3e6bf5 | 354 | pim_bfd_info_nbr_create(pim_ifp, neigh); |
d62a17ae | 355 | |
356 | return neigh; | |
12e41d03 DL |
357 | } |
358 | ||
359 | static void delete_prefix_list(struct pim_neighbor *neigh) | |
360 | { | |
d62a17ae | 361 | if (neigh->prefix_list) { |
12e41d03 DL |
362 | |
363 | #ifdef DUMP_PREFIX_LIST | |
d62a17ae | 364 | struct listnode *p_node; |
365 | struct prefix *p; | |
d62a17ae | 366 | int list_size = neigh->prefix_list |
367 | ? (int)listcount(neigh->prefix_list) | |
368 | : -1; | |
369 | int i = 0; | |
370 | for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, p_node, p)) { | |
d62a17ae | 371 | zlog_debug( |
53749ba7 | 372 | "%s: DUMP_PREFIX_LIST neigh=%x prefix_list=%x prefix=%x addr=%pFXh [%d/%d]", |
5e81f5dd | 373 | __func__, (unsigned)neigh, |
53749ba7 | 374 | (unsigned)neigh->prefix_list, (unsigned)p, p, i, |
375 | list_size); | |
d62a17ae | 376 | ++i; |
377 | } | |
12e41d03 DL |
378 | #endif |
379 | ||
6a154c88 | 380 | list_delete(&neigh->prefix_list); |
d62a17ae | 381 | } |
12e41d03 DL |
382 | } |
383 | ||
384 | void pim_neighbor_free(struct pim_neighbor *neigh) | |
385 | { | |
df5dfb77 | 386 | assert(!neigh->t_expire_timer); |
12e41d03 | 387 | |
d62a17ae | 388 | delete_prefix_list(neigh); |
12e41d03 | 389 | |
6a154c88 | 390 | list_delete(&neigh->upstream_jp_agg); |
d62a17ae | 391 | THREAD_OFF(neigh->jp_timer); |
982bff89 | 392 | |
1f3e6bf5 | 393 | bfd_sess_free(&neigh->bfd_session); |
662ba9e6 | 394 | |
d62a17ae | 395 | XFREE(MTYPE_PIM_NEIGHBOR, neigh); |
12e41d03 DL |
396 | } |
397 | ||
d62a17ae | 398 | struct pim_neighbor *pim_neighbor_find_by_secondary(struct interface *ifp, |
399 | struct prefix *src) | |
07b17d59 | 400 | { |
d62a17ae | 401 | struct pim_interface *pim_ifp; |
402 | struct listnode *node, *pnode; | |
403 | struct pim_neighbor *neigh; | |
404 | struct prefix *p; | |
405 | ||
5b4d431d | 406 | if (!ifp || !ifp->info) |
d62a17ae | 407 | return NULL; |
408 | ||
5b4d431d SK |
409 | pim_ifp = ifp->info; |
410 | ||
d62a17ae | 411 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { |
412 | for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, pnode, p)) { | |
413 | if (prefix_same(p, src)) | |
414 | return neigh; | |
415 | } | |
416 | } | |
417 | ||
418 | return NULL; | |
07b17d59 DS |
419 | } |
420 | ||
12e41d03 | 421 | struct pim_neighbor *pim_neighbor_find(struct interface *ifp, |
9bb93fa0 | 422 | pim_addr source_addr) |
12e41d03 | 423 | { |
d62a17ae | 424 | struct pim_interface *pim_ifp; |
425 | struct listnode *node; | |
426 | struct pim_neighbor *neigh; | |
12e41d03 | 427 | |
d62a17ae | 428 | if (!ifp) |
429 | return NULL; | |
1131c2eb | 430 | |
d62a17ae | 431 | pim_ifp = ifp->info; |
432 | if (!pim_ifp) | |
433 | return NULL; | |
12e41d03 | 434 | |
d62a17ae | 435 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { |
9bb93fa0 | 436 | if (!pim_addr_cmp(source_addr, neigh->source_addr)) { |
d62a17ae | 437 | return neigh; |
438 | } | |
439 | } | |
12e41d03 | 440 | |
d62a17ae | 441 | return NULL; |
12e41d03 DL |
442 | } |
443 | ||
99deb321 DS |
444 | /* |
445 | * Find the *one* interface out | |
446 | * this interface. If more than | |
447 | * one return NULL | |
448 | */ | |
d62a17ae | 449 | struct pim_neighbor *pim_neighbor_find_if(struct interface *ifp) |
99deb321 | 450 | { |
d62a17ae | 451 | struct pim_interface *pim_ifp = ifp->info; |
99deb321 | 452 | |
d62a17ae | 453 | if (!pim_ifp || pim_ifp->pim_neighbor_list->count != 1) |
454 | return NULL; | |
99deb321 | 455 | |
d62a17ae | 456 | return listnode_head(pim_ifp->pim_neighbor_list); |
99deb321 DS |
457 | } |
458 | ||
d62a17ae | 459 | struct pim_neighbor * |
9bb93fa0 | 460 | pim_neighbor_add(struct interface *ifp, pim_addr source_addr, |
d62a17ae | 461 | pim_hello_options hello_options, uint16_t holdtime, |
462 | uint16_t propagation_delay, uint16_t override_interval, | |
463 | uint32_t dr_priority, uint32_t generation_id, | |
464 | struct list *addr_list, int send_hello_now) | |
12e41d03 | 465 | { |
d62a17ae | 466 | struct pim_interface *pim_ifp; |
467 | struct pim_neighbor *neigh; | |
468 | ||
469 | neigh = pim_neighbor_new(ifp, source_addr, hello_options, holdtime, | |
470 | propagation_delay, override_interval, | |
471 | dr_priority, generation_id, addr_list); | |
472 | if (!neigh) { | |
473 | return 0; | |
474 | } | |
12e41d03 | 475 | |
d62a17ae | 476 | pim_ifp = ifp->info; |
df5dfb77 | 477 | assert(pim_ifp); |
12e41d03 | 478 | |
d62a17ae | 479 | listnode_add(pim_ifp->pim_neighbor_list, neigh); |
12e41d03 | 480 | |
9bb93fa0 DL |
481 | if (PIM_DEBUG_PIM_TRACE_DETAIL) |
482 | zlog_debug("%s: neighbor %pPA added ", __func__, &source_addr); | |
d62a17ae | 483 | /* |
484 | RFC 4601: 4.3.2. DR Election | |
485 | ||
486 | A router's idea of the current DR on an interface can change when a | |
487 | PIM Hello message is received, when a neighbor times out, or when a | |
488 | router's own DR Priority changes. | |
489 | */ | |
490 | pim_if_dr_election(neigh->interface); // new neighbor -- should not | |
491 | // trigger dr election... | |
492 | ||
493 | /* | |
494 | RFC 4601: 4.3.1. Sending Hello Messages | |
495 | ||
496 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
497 | when a Hello message is received from a new neighbor, or a Hello | |
498 | message with a new GenID is received from an existing neighbor, a | |
499 | new Hello message should be sent on this interface after a | |
500 | randomized delay between 0 and Triggered_Hello_Delay. | |
501 | ||
502 | This is a bit silly to do it that way. If I get a new | |
503 | genid we need to send the hello *now* because we've | |
504 | lined up a bunch of join/prune messages to go out the | |
505 | interface. | |
506 | */ | |
507 | if (send_hello_now) | |
508 | pim_hello_restart_now(ifp); | |
509 | else | |
510 | pim_hello_restart_triggered(neigh->interface); | |
511 | ||
9b29ea95 | 512 | pim_upstream_find_new_rpf(pim_ifp->pim); |
d62a17ae | 513 | |
514 | /* RNH can send nexthop update prior to PIM neibhor UP | |
515 | in that case nexthop cache would not consider this neighbor | |
516 | as RPF. | |
517 | Upon PIM neighbor UP, iterate all RPs and update | |
518 | nexthop cache with this neighbor. | |
519 | */ | |
c9cd7fbc | 520 | pim_resolve_rp_nh(pim_ifp->pim, neigh); |
d62a17ae | 521 | |
fec883d9 | 522 | pim_rp_setup(pim_ifp->pim); |
d62a17ae | 523 | |
da11e325 | 524 | sched_rpf_cache_refresh(pim_ifp->pim); |
d62a17ae | 525 | return neigh; |
12e41d03 DL |
526 | } |
527 | ||
d62a17ae | 528 | static uint16_t find_neighbors_next_highest_propagation_delay_msec( |
529 | struct interface *ifp, struct pim_neighbor *highest_neigh) | |
12e41d03 | 530 | { |
d62a17ae | 531 | struct pim_interface *pim_ifp; |
532 | struct listnode *neigh_node; | |
533 | struct pim_neighbor *neigh; | |
534 | uint16_t next_highest_delay_msec; | |
535 | ||
536 | pim_ifp = ifp->info; | |
df5dfb77 | 537 | assert(pim_ifp); |
d62a17ae | 538 | |
539 | next_highest_delay_msec = pim_ifp->pim_propagation_delay_msec; | |
540 | ||
541 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, neigh_node, | |
542 | neigh)) { | |
543 | if (neigh == highest_neigh) | |
544 | continue; | |
545 | if (neigh->propagation_delay_msec > next_highest_delay_msec) | |
546 | next_highest_delay_msec = neigh->propagation_delay_msec; | |
547 | } | |
12e41d03 | 548 | |
d62a17ae | 549 | return next_highest_delay_msec; |
550 | } | |
12e41d03 | 551 | |
d62a17ae | 552 | static uint16_t find_neighbors_next_highest_override_interval_msec( |
553 | struct interface *ifp, struct pim_neighbor *highest_neigh) | |
554 | { | |
555 | struct pim_interface *pim_ifp; | |
556 | struct listnode *neigh_node; | |
557 | struct pim_neighbor *neigh; | |
558 | uint16_t next_highest_interval_msec; | |
559 | ||
560 | pim_ifp = ifp->info; | |
df5dfb77 | 561 | assert(pim_ifp); |
d62a17ae | 562 | |
563 | next_highest_interval_msec = pim_ifp->pim_override_interval_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->override_interval_msec > next_highest_interval_msec) | |
570 | next_highest_interval_msec = | |
571 | neigh->override_interval_msec; | |
572 | } | |
12e41d03 | 573 | |
d62a17ae | 574 | return next_highest_interval_msec; |
12e41d03 DL |
575 | } |
576 | ||
d62a17ae | 577 | void pim_neighbor_delete(struct interface *ifp, struct pim_neighbor *neigh, |
12e41d03 DL |
578 | const char *delete_message) |
579 | { | |
d62a17ae | 580 | struct pim_interface *pim_ifp; |
12e41d03 | 581 | |
d62a17ae | 582 | pim_ifp = ifp->info; |
df5dfb77 | 583 | assert(pim_ifp); |
12e41d03 | 584 | |
9bb93fa0 DL |
585 | zlog_notice("PIM NEIGHBOR DOWN: neighbor %pPA on interface %s: %s", |
586 | &neigh->source_addr, ifp->name, delete_message); | |
12e41d03 | 587 | |
d62a17ae | 588 | THREAD_OFF(neigh->t_expire_timer); |
12e41d03 | 589 | |
d62a17ae | 590 | pim_if_assert_on_neighbor_down(ifp, neigh->source_addr); |
12e41d03 | 591 | |
d62a17ae | 592 | if (!PIM_OPTION_IS_SET(neigh->hello_options, |
593 | PIM_OPTION_MASK_LAN_PRUNE_DELAY)) { | |
594 | /* update num. of neighbors without hello option lan_delay */ | |
12e41d03 | 595 | |
d62a17ae | 596 | --pim_ifp->pim_number_of_nonlandelay_neighbors; |
597 | } | |
12e41d03 | 598 | |
d62a17ae | 599 | if (!PIM_OPTION_IS_SET(neigh->hello_options, |
600 | PIM_OPTION_MASK_DR_PRIORITY)) { | |
601 | /* update num. of neighbors without dr_pri */ | |
12e41d03 | 602 | |
d62a17ae | 603 | --pim_ifp->pim_dr_num_nondrpri_neighbors; |
604 | } | |
12e41d03 | 605 | |
df5dfb77 DL |
606 | assert(neigh->propagation_delay_msec |
607 | <= pim_ifp->pim_neighbors_highest_propagation_delay_msec); | |
608 | assert(neigh->override_interval_msec | |
609 | <= pim_ifp->pim_neighbors_highest_override_interval_msec); | |
d62a17ae | 610 | |
611 | if (pim_if_lan_delay_enabled(ifp)) { | |
612 | ||
613 | /* will delete a neighbor with highest propagation delay? */ | |
614 | if (neigh->propagation_delay_msec | |
615 | == pim_ifp->pim_neighbors_highest_propagation_delay_msec) { | |
616 | /* then find the next highest propagation delay */ | |
617 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = | |
618 | find_neighbors_next_highest_propagation_delay_msec( | |
619 | ifp, neigh); | |
620 | } | |
621 | ||
622 | /* will delete a neighbor with highest override interval? */ | |
623 | if (neigh->override_interval_msec | |
624 | == pim_ifp->pim_neighbors_highest_override_interval_msec) { | |
625 | /* then find the next highest propagation delay */ | |
626 | pim_ifp->pim_neighbors_highest_override_interval_msec = | |
627 | find_neighbors_next_highest_override_interval_msec( | |
628 | ifp, neigh); | |
629 | } | |
630 | } | |
12e41d03 | 631 | |
d62a17ae | 632 | if (PIM_DEBUG_PIM_TRACE) { |
9bb93fa0 DL |
633 | zlog_debug("%s: deleting PIM neighbor %pPA on interface %s", |
634 | __func__, &neigh->source_addr, ifp->name); | |
d62a17ae | 635 | } |
12e41d03 | 636 | |
d62a17ae | 637 | listnode_delete(pim_ifp->pim_neighbor_list, neigh); |
12e41d03 | 638 | |
d62a17ae | 639 | pim_neighbor_free(neigh); |
da72c9fd | 640 | |
da11e325 | 641 | sched_rpf_cache_refresh(pim_ifp->pim); |
12e41d03 DL |
642 | } |
643 | ||
d62a17ae | 644 | void pim_neighbor_delete_all(struct interface *ifp, const char *delete_message) |
12e41d03 | 645 | { |
d62a17ae | 646 | struct pim_interface *pim_ifp; |
647 | struct listnode *neigh_node; | |
648 | struct listnode *neigh_nextnode; | |
649 | struct pim_neighbor *neigh; | |
650 | ||
651 | pim_ifp = ifp->info; | |
df5dfb77 | 652 | assert(pim_ifp); |
d62a17ae | 653 | |
654 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_neighbor_list, neigh_node, | |
655 | neigh_nextnode, neigh)) { | |
656 | pim_neighbor_delete(ifp, neigh, delete_message); | |
657 | } | |
12e41d03 DL |
658 | } |
659 | ||
660 | struct prefix *pim_neighbor_find_secondary(struct pim_neighbor *neigh, | |
07b17d59 | 661 | struct prefix *addr) |
12e41d03 | 662 | { |
d62a17ae | 663 | struct listnode *node; |
664 | struct prefix *p; | |
12e41d03 | 665 | |
d62a17ae | 666 | if (!neigh->prefix_list) |
667 | return 0; | |
12e41d03 | 668 | |
d62a17ae | 669 | for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, node, p)) { |
670 | if (prefix_same(p, addr)) | |
671 | return p; | |
672 | } | |
12e41d03 | 673 | |
d62a17ae | 674 | return NULL; |
12e41d03 DL |
675 | } |
676 | ||
677 | /* | |
678 | RFC 4601: 4.3.4. Maintaining Secondary Address Lists | |
d62a17ae | 679 | |
12e41d03 DL |
680 | All the advertised secondary addresses in received Hello messages |
681 | must be checked against those previously advertised by all other | |
682 | PIM neighbors on that interface. If there is a conflict and the | |
683 | same secondary address was previously advertised by another | |
684 | neighbor, then only the most recently received mapping MUST be | |
685 | maintained, and an error message SHOULD be logged to the | |
686 | administrator in a rate-limited manner. | |
687 | */ | |
688 | static void delete_from_neigh_addr(struct interface *ifp, | |
9bb93fa0 | 689 | struct list *addr_list, pim_addr neigh_addr) |
12e41d03 | 690 | { |
d62a17ae | 691 | struct listnode *addr_node; |
692 | struct prefix *addr; | |
693 | struct pim_interface *pim_ifp; | |
694 | ||
695 | pim_ifp = ifp->info; | |
df5dfb77 | 696 | assert(pim_ifp); |
d62a17ae | 697 | |
df5dfb77 | 698 | assert(addr_list); |
d62a17ae | 699 | |
700 | /* | |
701 | Scan secondary address list | |
702 | */ | |
703 | for (ALL_LIST_ELEMENTS_RO(addr_list, addr_node, addr)) { | |
704 | struct listnode *neigh_node; | |
705 | struct pim_neighbor *neigh; | |
706 | ||
d58395d1 | 707 | if (addr->family != PIM_AF) |
d62a17ae | 708 | continue; |
d62a17ae | 709 | /* |
710 | Scan neighbors | |
711 | */ | |
712 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, | |
713 | neigh_node, neigh)) { | |
714 | { | |
715 | struct prefix *p = pim_neighbor_find_secondary( | |
716 | neigh, addr); | |
717 | if (p) { | |
d62a17ae | 718 | zlog_info( |
53749ba7 | 719 | "secondary addr %pFXh recvd from neigh %pPA deleted from neigh %pPA on %s", |
720 | addr, &neigh_addr, | |
9bb93fa0 | 721 | &neigh->source_addr, ifp->name); |
d62a17ae | 722 | |
723 | listnode_delete(neigh->prefix_list, p); | |
63265b5c | 724 | prefix_free(&p); |
d62a17ae | 725 | } |
726 | } | |
727 | ||
728 | } /* scan neighbors */ | |
729 | ||
730 | } /* scan addr list */ | |
12e41d03 DL |
731 | } |
732 | ||
733 | void pim_neighbor_update(struct pim_neighbor *neigh, | |
d62a17ae | 734 | pim_hello_options hello_options, uint16_t holdtime, |
735 | uint32_t dr_priority, struct list *addr_list) | |
12e41d03 | 736 | { |
d62a17ae | 737 | struct pim_interface *pim_ifp = neigh->interface->info; |
b3a474d8 | 738 | uint32_t old, new; |
d62a17ae | 739 | |
740 | /* Received holdtime ? */ | |
741 | if (PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_HOLDTIME)) { | |
742 | pim_neighbor_timer_reset(neigh, holdtime); | |
743 | } else { | |
744 | pim_neighbor_timer_reset(neigh, | |
745 | PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
746 | } | |
12e41d03 DL |
747 | |
748 | #ifdef DUMP_PREFIX_LIST | |
d62a17ae | 749 | zlog_debug( |
750 | "%s: DUMP_PREFIX_LIST old_prefix_list=%x old_size=%d new_prefix_list=%x new_size=%d", | |
15569c58 | 751 | __func__, (unsigned)neigh->prefix_list, |
d62a17ae | 752 | neigh->prefix_list ? (int)listcount(neigh->prefix_list) : -1, |
753 | (unsigned)addr_list, | |
754 | addr_list ? (int)listcount(addr_list) : -1); | |
12e41d03 DL |
755 | #endif |
756 | ||
d62a17ae | 757 | if (neigh->prefix_list == addr_list) { |
758 | if (addr_list) { | |
af4c2728 | 759 | flog_err( |
450971aa | 760 | EC_LIB_DEVELOPMENT, |
d62a17ae | 761 | "%s: internal error: trying to replace same prefix list=%p", |
15569c58 | 762 | __func__, (void *)addr_list); |
d62a17ae | 763 | } |
764 | } else { | |
765 | /* Delete existing secondary address list */ | |
766 | delete_prefix_list(neigh); | |
767 | } | |
768 | ||
769 | if (addr_list) { | |
770 | delete_from_neigh_addr(neigh->interface, addr_list, | |
771 | neigh->source_addr); | |
772 | } | |
773 | ||
774 | /* Replace secondary address list */ | |
775 | neigh->prefix_list = addr_list; | |
776 | ||
777 | update_dr_priority(neigh, hello_options, dr_priority); | |
b3a474d8 | 778 | new = PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_LAN_PRUNE_DELAY); |
779 | old = PIM_OPTION_IS_SET(neigh->hello_options, | |
780 | PIM_OPTION_MASK_LAN_PRUNE_DELAY); | |
781 | ||
782 | if (old != new) { | |
783 | if (old) | |
784 | ++pim_ifp->pim_number_of_nonlandelay_neighbors; | |
785 | else | |
786 | --pim_ifp->pim_number_of_nonlandelay_neighbors; | |
787 | } | |
d62a17ae | 788 | /* |
789 | Copy flags | |
790 | */ | |
791 | neigh->hello_options = hello_options; | |
12e41d03 | 792 | } |