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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
12e41d03 | 2 | /* |
896014f4 DL |
3 | * PIM for Quagga |
4 | * Copyright (C) 2008 Everton da Silva Marques | |
896014f4 | 5 | */ |
12e41d03 DL |
6 | |
7 | #include <zebra.h> | |
8 | ||
9 | #include "log.h" | |
10 | #include "prefix.h" | |
11 | #include "memory.h" | |
744d91b3 | 12 | #include "if.h" |
e446de6a DS |
13 | #include "vty.h" |
14 | #include "plist.h" | |
3613d898 | 15 | #include "lib_errors.h" |
12e41d03 DL |
16 | |
17 | #include "pimd.h" | |
993e3d8e | 18 | #include "pim_instance.h" |
12e41d03 DL |
19 | #include "pim_neighbor.h" |
20 | #include "pim_time.h" | |
21 | #include "pim_str.h" | |
22 | #include "pim_iface.h" | |
23 | #include "pim_pim.h" | |
24 | #include "pim_upstream.h" | |
25 | #include "pim_ifchannel.h" | |
e446de6a | 26 | #include "pim_rp.h" |
da72c9fd | 27 | #include "pim_zebra.h" |
982bff89 DS |
28 | #include "pim_join.h" |
29 | #include "pim_jp_agg.h" | |
ba4eb1bc | 30 | #include "pim_bfd.h" |
46a9ea8b | 31 | #include "pim_register.h" |
12e41d03 DL |
32 | |
33 | static void dr_election_by_addr(struct interface *ifp) | |
34 | { | |
d62a17ae | 35 | struct pim_interface *pim_ifp; |
36 | struct listnode *node; | |
37 | struct pim_neighbor *neigh; | |
38 | ||
39 | pim_ifp = ifp->info; | |
df5dfb77 | 40 | assert(pim_ifp); |
d62a17ae | 41 | |
42 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
43 | ||
44 | if (PIM_DEBUG_PIM_TRACE) { | |
5e81f5dd | 45 | zlog_debug("%s: on interface %s", __func__, ifp->name); |
d62a17ae | 46 | } |
47 | ||
48 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { | |
9bb93fa0 | 49 | if (pim_addr_cmp(neigh->source_addr, pim_ifp->pim_dr_addr) > 0) |
d62a17ae | 50 | pim_ifp->pim_dr_addr = neigh->source_addr; |
d62a17ae | 51 | } |
12e41d03 DL |
52 | } |
53 | ||
54 | static void dr_election_by_pri(struct interface *ifp) | |
55 | { | |
d62a17ae | 56 | struct pim_interface *pim_ifp; |
57 | struct listnode *node; | |
58 | struct pim_neighbor *neigh; | |
59 | uint32_t dr_pri; | |
60 | ||
61 | pim_ifp = ifp->info; | |
df5dfb77 | 62 | assert(pim_ifp); |
d62a17ae | 63 | |
64 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
65 | dr_pri = pim_ifp->pim_dr_priority; | |
66 | ||
67 | if (PIM_DEBUG_PIM_TRACE) { | |
5e81f5dd DS |
68 | zlog_debug("%s: dr pri %u on interface %s", __func__, dr_pri, |
69 | ifp->name); | |
d62a17ae | 70 | } |
71 | ||
72 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { | |
73 | if (PIM_DEBUG_PIM_TRACE) { | |
9bb93fa0 | 74 | zlog_info("%s: neigh pri %u addr %pPA if dr addr %pPA", |
5e81f5dd | 75 | __func__, neigh->dr_priority, |
9bb93fa0 | 76 | &neigh->source_addr, &pim_ifp->pim_dr_addr); |
d62a17ae | 77 | } |
9bb93fa0 DL |
78 | if ((neigh->dr_priority > dr_pri) || |
79 | ((neigh->dr_priority == dr_pri) && | |
80 | (pim_addr_cmp(neigh->source_addr, pim_ifp->pim_dr_addr) > | |
81 | 0))) { | |
d62a17ae | 82 | pim_ifp->pim_dr_addr = neigh->source_addr; |
83 | dr_pri = neigh->dr_priority; | |
84 | } | |
85 | } | |
12e41d03 DL |
86 | } |
87 | ||
88 | /* | |
89 | RFC 4601: 4.3.2. DR Election | |
90 | ||
91 | A router's idea of the current DR on an interface can change when a | |
92 | PIM Hello message is received, when a neighbor times out, or when a | |
93 | router's own DR Priority changes. | |
94 | */ | |
dedccda6 | 95 | int pim_if_dr_election(struct interface *ifp) |
12e41d03 | 96 | { |
d62a17ae | 97 | struct pim_interface *pim_ifp = ifp->info; |
034db86b | 98 | pim_addr old_dr_addr; |
d62a17ae | 99 | |
100 | ++pim_ifp->pim_dr_election_count; | |
101 | ||
102 | old_dr_addr = pim_ifp->pim_dr_addr; | |
103 | ||
104 | if (pim_ifp->pim_dr_num_nondrpri_neighbors) { | |
105 | dr_election_by_addr(ifp); | |
106 | } else { | |
107 | dr_election_by_pri(ifp); | |
108 | } | |
109 | ||
110 | /* DR changed ? */ | |
034db86b DL |
111 | if (pim_addr_cmp(old_dr_addr, pim_ifp->pim_dr_addr)) { |
112 | ||
113 | if (PIM_DEBUG_PIM_EVENTS) | |
114 | zlog_debug( | |
115 | "%s: DR was %pPA now is %pPA on interface %s", | |
116 | __func__, &old_dr_addr, &pim_ifp->pim_dr_addr, | |
117 | ifp->name); | |
d62a17ae | 118 | |
119 | pim_ifp->pim_dr_election_last = | |
120 | pim_time_monotonic_sec(); /* timestamp */ | |
121 | ++pim_ifp->pim_dr_election_changes; | |
122 | pim_if_update_join_desired(pim_ifp); | |
123 | pim_if_update_could_assert(ifp); | |
124 | pim_if_update_assert_tracking_desired(ifp); | |
46a9ea8b | 125 | |
126 | if (PIM_I_am_DR(pim_ifp)) | |
127 | pim_ifp->am_i_dr = true; | |
128 | else { | |
129 | if (pim_ifp->am_i_dr == true) { | |
130 | pim_reg_del_on_couldreg_fail(ifp); | |
131 | pim_ifp->am_i_dr = false; | |
132 | } | |
133 | } | |
134 | ||
d62a17ae | 135 | return 1; |
136 | } | |
137 | ||
138 | return 0; | |
12e41d03 DL |
139 | } |
140 | ||
141 | static void update_dr_priority(struct pim_neighbor *neigh, | |
142 | pim_hello_options hello_options, | |
143 | uint32_t dr_priority) | |
144 | { | |
d62a17ae | 145 | pim_hello_options will_set_pri; /* boolean */ |
146 | pim_hello_options bit_flip; /* boolean */ | |
147 | pim_hello_options pri_change; /* boolean */ | |
148 | ||
149 | will_set_pri = | |
150 | PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_DR_PRIORITY); | |
151 | ||
152 | bit_flip = (will_set_pri | |
153 | != PIM_OPTION_IS_SET(neigh->hello_options, | |
154 | PIM_OPTION_MASK_DR_PRIORITY)); | |
155 | ||
156 | if (bit_flip) { | |
157 | struct pim_interface *pim_ifp = neigh->interface->info; | |
158 | ||
159 | /* update num. of neighbors without dr_pri */ | |
160 | ||
161 | if (will_set_pri) { | |
162 | --pim_ifp->pim_dr_num_nondrpri_neighbors; | |
163 | } else { | |
164 | ++pim_ifp->pim_dr_num_nondrpri_neighbors; | |
165 | } | |
166 | } | |
167 | ||
168 | pri_change = (bit_flip || (neigh->dr_priority != dr_priority)); | |
169 | ||
170 | if (will_set_pri) { | |
171 | neigh->dr_priority = dr_priority; | |
172 | } else { | |
173 | neigh->dr_priority = 0; /* cosmetic unset */ | |
174 | } | |
175 | ||
176 | if (pri_change) { | |
177 | /* | |
178 | RFC 4601: 4.3.2. DR Election | |
179 | ||
180 | A router's idea of the current DR on an interface can change | |
181 | when a | |
182 | PIM Hello message is received, when a neighbor times out, or | |
183 | when a | |
184 | router's own DR Priority changes. | |
185 | */ | |
186 | pim_if_dr_election( | |
187 | neigh->interface); // router's own DR Priority changes | |
188 | } | |
12e41d03 DL |
189 | } |
190 | ||
cc9f21da | 191 | static void on_neighbor_timer(struct thread *t) |
12e41d03 | 192 | { |
d62a17ae | 193 | struct pim_neighbor *neigh; |
194 | struct interface *ifp; | |
195 | char msg[100]; | |
196 | ||
197 | neigh = THREAD_ARG(t); | |
198 | ||
199 | ifp = neigh->interface; | |
200 | ||
9bb93fa0 | 201 | if (PIM_DEBUG_PIM_TRACE) |
d62a17ae | 202 | zlog_debug( |
9bb93fa0 DL |
203 | "Expired %d sec holdtime for neighbor %pPA on interface %s", |
204 | neigh->holdtime, &neigh->source_addr, ifp->name); | |
d62a17ae | 205 | |
206 | snprintf(msg, sizeof(msg), "%d-sec holdtime expired", neigh->holdtime); | |
207 | pim_neighbor_delete(ifp, neigh, msg); | |
208 | ||
209 | /* | |
210 | RFC 4601: 4.3.2. DR Election | |
211 | ||
212 | A router's idea of the current DR on an interface can change when a | |
213 | PIM Hello message is received, when a neighbor times out, or when a | |
214 | router's own DR Priority changes. | |
215 | */ | |
216 | pim_if_dr_election(ifp); // neighbor times out | |
12e41d03 DL |
217 | } |
218 | ||
12e41d03 DL |
219 | void pim_neighbor_timer_reset(struct pim_neighbor *neigh, uint16_t holdtime) |
220 | { | |
d62a17ae | 221 | neigh->holdtime = holdtime; |
222 | ||
223 | THREAD_OFF(neigh->t_expire_timer); | |
224 | ||
225 | /* | |
226 | 0xFFFF is request for no holdtime | |
227 | */ | |
228 | if (neigh->holdtime == 0xFFFF) { | |
229 | return; | |
230 | } | |
231 | ||
9bb93fa0 DL |
232 | if (PIM_DEBUG_PIM_TRACE_DETAIL) |
233 | zlog_debug("%s: starting %u sec timer for neighbor %pPA on %s", | |
234 | __func__, neigh->holdtime, &neigh->source_addr, | |
d62a17ae | 235 | neigh->interface->name); |
d62a17ae | 236 | |
36417fcc DS |
237 | thread_add_timer(router->master, on_neighbor_timer, neigh, |
238 | neigh->holdtime, &neigh->t_expire_timer); | |
12e41d03 DL |
239 | } |
240 | ||
cc9f21da | 241 | static void on_neighbor_jp_timer(struct thread *t) |
982bff89 | 242 | { |
d62a17ae | 243 | struct pim_neighbor *neigh = THREAD_ARG(t); |
244 | struct pim_rpf rpf; | |
245 | ||
9bb93fa0 DL |
246 | if (PIM_DEBUG_PIM_TRACE) |
247 | zlog_debug("%s:Sending JP Agg to %pPA on %s with %d groups", | |
248 | __func__, &neigh->source_addr, | |
249 | neigh->interface->name, | |
d62a17ae | 250 | neigh->upstream_jp_agg->count); |
982bff89 | 251 | |
d62a17ae | 252 | rpf.source_nexthop.interface = neigh->interface; |
bad81cbc | 253 | rpf.rpf_addr = neigh->source_addr; |
d62a17ae | 254 | pim_joinprune_send(&rpf, neigh->upstream_jp_agg); |
982bff89 | 255 | |
36417fcc | 256 | thread_add_timer(router->master, on_neighbor_jp_timer, neigh, |
5b45753e | 257 | router->t_periodic, &neigh->jp_timer); |
982bff89 DS |
258 | } |
259 | ||
d62a17ae | 260 | static void pim_neighbor_start_jp_timer(struct pim_neighbor *neigh) |
982bff89 | 261 | { |
50478845 | 262 | THREAD_OFF(neigh->jp_timer); |
36417fcc | 263 | thread_add_timer(router->master, on_neighbor_jp_timer, neigh, |
5b45753e | 264 | router->t_periodic, &neigh->jp_timer); |
982bff89 DS |
265 | } |
266 | ||
d62a17ae | 267 | static struct pim_neighbor * |
9bb93fa0 | 268 | pim_neighbor_new(struct interface *ifp, pim_addr source_addr, |
d62a17ae | 269 | pim_hello_options hello_options, uint16_t holdtime, |
270 | uint16_t propagation_delay, uint16_t override_interval, | |
271 | uint32_t dr_priority, uint32_t generation_id, | |
272 | struct list *addr_list) | |
12e41d03 | 273 | { |
d62a17ae | 274 | struct pim_interface *pim_ifp; |
275 | struct pim_neighbor *neigh; | |
d62a17ae | 276 | |
df5dfb77 | 277 | assert(ifp); |
d62a17ae | 278 | pim_ifp = ifp->info; |
df5dfb77 | 279 | assert(pim_ifp); |
d62a17ae | 280 | |
281 | neigh = XCALLOC(MTYPE_PIM_NEIGHBOR, sizeof(*neigh)); | |
d62a17ae | 282 | |
283 | neigh->creation = pim_time_monotonic_sec(); | |
284 | neigh->source_addr = source_addr; | |
285 | neigh->hello_options = hello_options; | |
286 | neigh->propagation_delay_msec = propagation_delay; | |
287 | neigh->override_interval_msec = override_interval; | |
288 | neigh->dr_priority = dr_priority; | |
289 | neigh->generation_id = generation_id; | |
290 | neigh->prefix_list = addr_list; | |
291 | neigh->t_expire_timer = NULL; | |
292 | neigh->interface = ifp; | |
293 | ||
294 | neigh->upstream_jp_agg = list_new(); | |
295 | neigh->upstream_jp_agg->cmp = pim_jp_agg_group_list_cmp; | |
296 | neigh->upstream_jp_agg->del = | |
297 | (void (*)(void *))pim_jp_agg_group_list_free; | |
298 | pim_neighbor_start_jp_timer(neigh); | |
299 | ||
300 | pim_neighbor_timer_reset(neigh, holdtime); | |
301 | /* | |
302 | * The pim_ifstat_hello_sent variable is used to decide if | |
303 | * we should expedite a hello out the interface. If we | |
304 | * establish a new neighbor, we unfortunately need to | |
305 | * reset the value so that we can know to hurry up and | |
306 | * hello | |
307 | */ | |
79992e8a | 308 | PIM_IF_FLAG_UNSET_HELLO_SENT(pim_ifp->flags); |
d62a17ae | 309 | |
9bb93fa0 DL |
310 | if (PIM_DEBUG_PIM_EVENTS) |
311 | zlog_debug("%s: creating PIM neighbor %pPA on interface %s", | |
312 | __func__, &source_addr, ifp->name); | |
d62a17ae | 313 | |
9bb93fa0 DL |
314 | zlog_notice("PIM NEIGHBOR UP: neighbor %pPA on interface %s", |
315 | &source_addr, ifp->name); | |
d62a17ae | 316 | |
317 | if (neigh->propagation_delay_msec | |
318 | > pim_ifp->pim_neighbors_highest_propagation_delay_msec) { | |
319 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = | |
320 | neigh->propagation_delay_msec; | |
321 | } | |
322 | if (neigh->override_interval_msec | |
323 | > pim_ifp->pim_neighbors_highest_override_interval_msec) { | |
324 | pim_ifp->pim_neighbors_highest_override_interval_msec = | |
325 | neigh->override_interval_msec; | |
326 | } | |
327 | ||
328 | if (!PIM_OPTION_IS_SET(neigh->hello_options, | |
329 | PIM_OPTION_MASK_LAN_PRUNE_DELAY)) { | |
330 | /* update num. of neighbors without hello option lan_delay */ | |
331 | ++pim_ifp->pim_number_of_nonlandelay_neighbors; | |
332 | } | |
333 | ||
334 | if (!PIM_OPTION_IS_SET(neigh->hello_options, | |
335 | PIM_OPTION_MASK_DR_PRIORITY)) { | |
336 | /* update num. of neighbors without hello option dr_pri */ | |
337 | ++pim_ifp->pim_dr_num_nondrpri_neighbors; | |
338 | } | |
339 | ||
340 | // Register PIM Neighbor with BFD | |
1f3e6bf5 | 341 | pim_bfd_info_nbr_create(pim_ifp, neigh); |
d62a17ae | 342 | |
343 | return neigh; | |
12e41d03 DL |
344 | } |
345 | ||
346 | static void delete_prefix_list(struct pim_neighbor *neigh) | |
347 | { | |
d62a17ae | 348 | if (neigh->prefix_list) { |
12e41d03 DL |
349 | |
350 | #ifdef DUMP_PREFIX_LIST | |
d62a17ae | 351 | struct listnode *p_node; |
352 | struct prefix *p; | |
d62a17ae | 353 | int list_size = neigh->prefix_list |
354 | ? (int)listcount(neigh->prefix_list) | |
355 | : -1; | |
356 | int i = 0; | |
357 | for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, p_node, p)) { | |
d62a17ae | 358 | zlog_debug( |
53749ba7 | 359 | "%s: DUMP_PREFIX_LIST neigh=%x prefix_list=%x prefix=%x addr=%pFXh [%d/%d]", |
5e81f5dd | 360 | __func__, (unsigned)neigh, |
53749ba7 | 361 | (unsigned)neigh->prefix_list, (unsigned)p, p, i, |
362 | list_size); | |
d62a17ae | 363 | ++i; |
364 | } | |
12e41d03 DL |
365 | #endif |
366 | ||
6a154c88 | 367 | list_delete(&neigh->prefix_list); |
d62a17ae | 368 | } |
12e41d03 DL |
369 | } |
370 | ||
371 | void pim_neighbor_free(struct pim_neighbor *neigh) | |
372 | { | |
df5dfb77 | 373 | assert(!neigh->t_expire_timer); |
12e41d03 | 374 | |
d62a17ae | 375 | delete_prefix_list(neigh); |
12e41d03 | 376 | |
6a154c88 | 377 | list_delete(&neigh->upstream_jp_agg); |
d62a17ae | 378 | THREAD_OFF(neigh->jp_timer); |
982bff89 | 379 | |
1f3e6bf5 | 380 | bfd_sess_free(&neigh->bfd_session); |
662ba9e6 | 381 | |
d62a17ae | 382 | XFREE(MTYPE_PIM_NEIGHBOR, neigh); |
12e41d03 DL |
383 | } |
384 | ||
d62a17ae | 385 | struct pim_neighbor *pim_neighbor_find_by_secondary(struct interface *ifp, |
386 | struct prefix *src) | |
07b17d59 | 387 | { |
d62a17ae | 388 | struct pim_interface *pim_ifp; |
389 | struct listnode *node, *pnode; | |
390 | struct pim_neighbor *neigh; | |
391 | struct prefix *p; | |
392 | ||
5b4d431d | 393 | if (!ifp || !ifp->info) |
d62a17ae | 394 | return NULL; |
395 | ||
5b4d431d SK |
396 | pim_ifp = ifp->info; |
397 | ||
d62a17ae | 398 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { |
399 | for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, pnode, p)) { | |
400 | if (prefix_same(p, src)) | |
401 | return neigh; | |
402 | } | |
403 | } | |
404 | ||
405 | return NULL; | |
07b17d59 DS |
406 | } |
407 | ||
12e41d03 | 408 | struct pim_neighbor *pim_neighbor_find(struct interface *ifp, |
9bb93fa0 | 409 | pim_addr source_addr) |
12e41d03 | 410 | { |
d62a17ae | 411 | struct pim_interface *pim_ifp; |
412 | struct listnode *node; | |
413 | struct pim_neighbor *neigh; | |
12e41d03 | 414 | |
d62a17ae | 415 | if (!ifp) |
416 | return NULL; | |
1131c2eb | 417 | |
d62a17ae | 418 | pim_ifp = ifp->info; |
419 | if (!pim_ifp) | |
420 | return NULL; | |
12e41d03 | 421 | |
d62a17ae | 422 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { |
9bb93fa0 | 423 | if (!pim_addr_cmp(source_addr, neigh->source_addr)) { |
d62a17ae | 424 | return neigh; |
425 | } | |
426 | } | |
12e41d03 | 427 | |
d62a17ae | 428 | return NULL; |
12e41d03 DL |
429 | } |
430 | ||
99deb321 DS |
431 | /* |
432 | * Find the *one* interface out | |
433 | * this interface. If more than | |
434 | * one return NULL | |
435 | */ | |
d62a17ae | 436 | struct pim_neighbor *pim_neighbor_find_if(struct interface *ifp) |
99deb321 | 437 | { |
d62a17ae | 438 | struct pim_interface *pim_ifp = ifp->info; |
99deb321 | 439 | |
d62a17ae | 440 | if (!pim_ifp || pim_ifp->pim_neighbor_list->count != 1) |
441 | return NULL; | |
99deb321 | 442 | |
d62a17ae | 443 | return listnode_head(pim_ifp->pim_neighbor_list); |
99deb321 DS |
444 | } |
445 | ||
d62a17ae | 446 | struct pim_neighbor * |
9bb93fa0 | 447 | pim_neighbor_add(struct interface *ifp, pim_addr source_addr, |
d62a17ae | 448 | pim_hello_options hello_options, uint16_t holdtime, |
449 | uint16_t propagation_delay, uint16_t override_interval, | |
450 | uint32_t dr_priority, uint32_t generation_id, | |
451 | struct list *addr_list, int send_hello_now) | |
12e41d03 | 452 | { |
d62a17ae | 453 | struct pim_interface *pim_ifp; |
454 | struct pim_neighbor *neigh; | |
455 | ||
456 | neigh = pim_neighbor_new(ifp, source_addr, hello_options, holdtime, | |
457 | propagation_delay, override_interval, | |
458 | dr_priority, generation_id, addr_list); | |
459 | if (!neigh) { | |
460 | return 0; | |
461 | } | |
12e41d03 | 462 | |
d62a17ae | 463 | pim_ifp = ifp->info; |
df5dfb77 | 464 | assert(pim_ifp); |
12e41d03 | 465 | |
d62a17ae | 466 | listnode_add(pim_ifp->pim_neighbor_list, neigh); |
12e41d03 | 467 | |
9bb93fa0 DL |
468 | if (PIM_DEBUG_PIM_TRACE_DETAIL) |
469 | zlog_debug("%s: neighbor %pPA added ", __func__, &source_addr); | |
d62a17ae | 470 | /* |
471 | RFC 4601: 4.3.2. DR Election | |
472 | ||
473 | A router's idea of the current DR on an interface can change when a | |
474 | PIM Hello message is received, when a neighbor times out, or when a | |
475 | router's own DR Priority changes. | |
476 | */ | |
477 | pim_if_dr_election(neigh->interface); // new neighbor -- should not | |
478 | // trigger dr election... | |
479 | ||
480 | /* | |
481 | RFC 4601: 4.3.1. Sending Hello Messages | |
482 | ||
483 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
484 | when a Hello message is received from a new neighbor, or a Hello | |
485 | message with a new GenID is received from an existing neighbor, a | |
486 | new Hello message should be sent on this interface after a | |
487 | randomized delay between 0 and Triggered_Hello_Delay. | |
488 | ||
489 | This is a bit silly to do it that way. If I get a new | |
490 | genid we need to send the hello *now* because we've | |
491 | lined up a bunch of join/prune messages to go out the | |
492 | interface. | |
493 | */ | |
494 | if (send_hello_now) | |
495 | pim_hello_restart_now(ifp); | |
496 | else | |
497 | pim_hello_restart_triggered(neigh->interface); | |
498 | ||
9b29ea95 | 499 | pim_upstream_find_new_rpf(pim_ifp->pim); |
d62a17ae | 500 | |
501 | /* RNH can send nexthop update prior to PIM neibhor UP | |
502 | in that case nexthop cache would not consider this neighbor | |
503 | as RPF. | |
504 | Upon PIM neighbor UP, iterate all RPs and update | |
505 | nexthop cache with this neighbor. | |
506 | */ | |
c9cd7fbc | 507 | pim_resolve_rp_nh(pim_ifp->pim, neigh); |
d62a17ae | 508 | |
fec883d9 | 509 | pim_rp_setup(pim_ifp->pim); |
d62a17ae | 510 | |
da11e325 | 511 | sched_rpf_cache_refresh(pim_ifp->pim); |
d62a17ae | 512 | return neigh; |
12e41d03 DL |
513 | } |
514 | ||
d62a17ae | 515 | static uint16_t find_neighbors_next_highest_propagation_delay_msec( |
516 | struct interface *ifp, struct pim_neighbor *highest_neigh) | |
12e41d03 | 517 | { |
d62a17ae | 518 | struct pim_interface *pim_ifp; |
519 | struct listnode *neigh_node; | |
520 | struct pim_neighbor *neigh; | |
521 | uint16_t next_highest_delay_msec; | |
522 | ||
523 | pim_ifp = ifp->info; | |
df5dfb77 | 524 | assert(pim_ifp); |
d62a17ae | 525 | |
526 | next_highest_delay_msec = pim_ifp->pim_propagation_delay_msec; | |
527 | ||
528 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, neigh_node, | |
529 | neigh)) { | |
530 | if (neigh == highest_neigh) | |
531 | continue; | |
532 | if (neigh->propagation_delay_msec > next_highest_delay_msec) | |
533 | next_highest_delay_msec = neigh->propagation_delay_msec; | |
534 | } | |
12e41d03 | 535 | |
d62a17ae | 536 | return next_highest_delay_msec; |
537 | } | |
12e41d03 | 538 | |
d62a17ae | 539 | static uint16_t find_neighbors_next_highest_override_interval_msec( |
540 | struct interface *ifp, struct pim_neighbor *highest_neigh) | |
541 | { | |
542 | struct pim_interface *pim_ifp; | |
543 | struct listnode *neigh_node; | |
544 | struct pim_neighbor *neigh; | |
545 | uint16_t next_highest_interval_msec; | |
546 | ||
547 | pim_ifp = ifp->info; | |
df5dfb77 | 548 | assert(pim_ifp); |
d62a17ae | 549 | |
550 | next_highest_interval_msec = pim_ifp->pim_override_interval_msec; | |
551 | ||
552 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, neigh_node, | |
553 | neigh)) { | |
554 | if (neigh == highest_neigh) | |
555 | continue; | |
556 | if (neigh->override_interval_msec > next_highest_interval_msec) | |
557 | next_highest_interval_msec = | |
558 | neigh->override_interval_msec; | |
559 | } | |
12e41d03 | 560 | |
d62a17ae | 561 | return next_highest_interval_msec; |
12e41d03 DL |
562 | } |
563 | ||
d62a17ae | 564 | void pim_neighbor_delete(struct interface *ifp, struct pim_neighbor *neigh, |
12e41d03 DL |
565 | const char *delete_message) |
566 | { | |
d62a17ae | 567 | struct pim_interface *pim_ifp; |
12e41d03 | 568 | |
d62a17ae | 569 | pim_ifp = ifp->info; |
df5dfb77 | 570 | assert(pim_ifp); |
12e41d03 | 571 | |
9bb93fa0 DL |
572 | zlog_notice("PIM NEIGHBOR DOWN: neighbor %pPA on interface %s: %s", |
573 | &neigh->source_addr, ifp->name, delete_message); | |
12e41d03 | 574 | |
d62a17ae | 575 | THREAD_OFF(neigh->t_expire_timer); |
12e41d03 | 576 | |
d62a17ae | 577 | pim_if_assert_on_neighbor_down(ifp, neigh->source_addr); |
12e41d03 | 578 | |
d62a17ae | 579 | if (!PIM_OPTION_IS_SET(neigh->hello_options, |
580 | PIM_OPTION_MASK_LAN_PRUNE_DELAY)) { | |
581 | /* update num. of neighbors without hello option lan_delay */ | |
12e41d03 | 582 | |
d62a17ae | 583 | --pim_ifp->pim_number_of_nonlandelay_neighbors; |
584 | } | |
12e41d03 | 585 | |
d62a17ae | 586 | if (!PIM_OPTION_IS_SET(neigh->hello_options, |
587 | PIM_OPTION_MASK_DR_PRIORITY)) { | |
588 | /* update num. of neighbors without dr_pri */ | |
12e41d03 | 589 | |
d62a17ae | 590 | --pim_ifp->pim_dr_num_nondrpri_neighbors; |
591 | } | |
12e41d03 | 592 | |
df5dfb77 DL |
593 | assert(neigh->propagation_delay_msec |
594 | <= pim_ifp->pim_neighbors_highest_propagation_delay_msec); | |
595 | assert(neigh->override_interval_msec | |
596 | <= pim_ifp->pim_neighbors_highest_override_interval_msec); | |
d62a17ae | 597 | |
598 | if (pim_if_lan_delay_enabled(ifp)) { | |
599 | ||
600 | /* will delete a neighbor with highest propagation delay? */ | |
601 | if (neigh->propagation_delay_msec | |
602 | == pim_ifp->pim_neighbors_highest_propagation_delay_msec) { | |
603 | /* then find the next highest propagation delay */ | |
604 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = | |
605 | find_neighbors_next_highest_propagation_delay_msec( | |
606 | ifp, neigh); | |
607 | } | |
608 | ||
609 | /* will delete a neighbor with highest override interval? */ | |
610 | if (neigh->override_interval_msec | |
611 | == pim_ifp->pim_neighbors_highest_override_interval_msec) { | |
612 | /* then find the next highest propagation delay */ | |
613 | pim_ifp->pim_neighbors_highest_override_interval_msec = | |
614 | find_neighbors_next_highest_override_interval_msec( | |
615 | ifp, neigh); | |
616 | } | |
617 | } | |
12e41d03 | 618 | |
d62a17ae | 619 | if (PIM_DEBUG_PIM_TRACE) { |
9bb93fa0 DL |
620 | zlog_debug("%s: deleting PIM neighbor %pPA on interface %s", |
621 | __func__, &neigh->source_addr, ifp->name); | |
d62a17ae | 622 | } |
12e41d03 | 623 | |
d62a17ae | 624 | listnode_delete(pim_ifp->pim_neighbor_list, neigh); |
12e41d03 | 625 | |
d62a17ae | 626 | pim_neighbor_free(neigh); |
da72c9fd | 627 | |
da11e325 | 628 | sched_rpf_cache_refresh(pim_ifp->pim); |
12e41d03 DL |
629 | } |
630 | ||
d62a17ae | 631 | void pim_neighbor_delete_all(struct interface *ifp, const char *delete_message) |
12e41d03 | 632 | { |
d62a17ae | 633 | struct pim_interface *pim_ifp; |
634 | struct listnode *neigh_node; | |
635 | struct listnode *neigh_nextnode; | |
636 | struct pim_neighbor *neigh; | |
637 | ||
638 | pim_ifp = ifp->info; | |
df5dfb77 | 639 | assert(pim_ifp); |
d62a17ae | 640 | |
641 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_neighbor_list, neigh_node, | |
642 | neigh_nextnode, neigh)) { | |
643 | pim_neighbor_delete(ifp, neigh, delete_message); | |
644 | } | |
12e41d03 DL |
645 | } |
646 | ||
647 | struct prefix *pim_neighbor_find_secondary(struct pim_neighbor *neigh, | |
07b17d59 | 648 | struct prefix *addr) |
12e41d03 | 649 | { |
d62a17ae | 650 | struct listnode *node; |
651 | struct prefix *p; | |
12e41d03 | 652 | |
d62a17ae | 653 | if (!neigh->prefix_list) |
654 | return 0; | |
12e41d03 | 655 | |
d62a17ae | 656 | for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, node, p)) { |
657 | if (prefix_same(p, addr)) | |
658 | return p; | |
659 | } | |
12e41d03 | 660 | |
d62a17ae | 661 | return NULL; |
12e41d03 DL |
662 | } |
663 | ||
664 | /* | |
665 | RFC 4601: 4.3.4. Maintaining Secondary Address Lists | |
d62a17ae | 666 | |
12e41d03 DL |
667 | All the advertised secondary addresses in received Hello messages |
668 | must be checked against those previously advertised by all other | |
669 | PIM neighbors on that interface. If there is a conflict and the | |
670 | same secondary address was previously advertised by another | |
671 | neighbor, then only the most recently received mapping MUST be | |
672 | maintained, and an error message SHOULD be logged to the | |
673 | administrator in a rate-limited manner. | |
674 | */ | |
675 | static void delete_from_neigh_addr(struct interface *ifp, | |
9bb93fa0 | 676 | struct list *addr_list, pim_addr neigh_addr) |
12e41d03 | 677 | { |
d62a17ae | 678 | struct listnode *addr_node; |
679 | struct prefix *addr; | |
680 | struct pim_interface *pim_ifp; | |
681 | ||
682 | pim_ifp = ifp->info; | |
df5dfb77 | 683 | assert(pim_ifp); |
d62a17ae | 684 | |
df5dfb77 | 685 | assert(addr_list); |
d62a17ae | 686 | |
687 | /* | |
688 | Scan secondary address list | |
689 | */ | |
690 | for (ALL_LIST_ELEMENTS_RO(addr_list, addr_node, addr)) { | |
691 | struct listnode *neigh_node; | |
692 | struct pim_neighbor *neigh; | |
693 | ||
d58395d1 | 694 | if (addr->family != PIM_AF) |
d62a17ae | 695 | continue; |
d62a17ae | 696 | /* |
697 | Scan neighbors | |
698 | */ | |
699 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, | |
700 | neigh_node, neigh)) { | |
701 | { | |
702 | struct prefix *p = pim_neighbor_find_secondary( | |
703 | neigh, addr); | |
704 | if (p) { | |
d62a17ae | 705 | zlog_info( |
53749ba7 | 706 | "secondary addr %pFXh recvd from neigh %pPA deleted from neigh %pPA on %s", |
707 | addr, &neigh_addr, | |
9bb93fa0 | 708 | &neigh->source_addr, ifp->name); |
d62a17ae | 709 | |
710 | listnode_delete(neigh->prefix_list, p); | |
63265b5c | 711 | prefix_free(&p); |
d62a17ae | 712 | } |
713 | } | |
714 | ||
715 | } /* scan neighbors */ | |
716 | ||
717 | } /* scan addr list */ | |
12e41d03 DL |
718 | } |
719 | ||
720 | void pim_neighbor_update(struct pim_neighbor *neigh, | |
d62a17ae | 721 | pim_hello_options hello_options, uint16_t holdtime, |
722 | uint32_t dr_priority, struct list *addr_list) | |
12e41d03 | 723 | { |
d62a17ae | 724 | struct pim_interface *pim_ifp = neigh->interface->info; |
b3a474d8 | 725 | uint32_t old, new; |
d62a17ae | 726 | |
727 | /* Received holdtime ? */ | |
728 | if (PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_HOLDTIME)) { | |
729 | pim_neighbor_timer_reset(neigh, holdtime); | |
730 | } else { | |
731 | pim_neighbor_timer_reset(neigh, | |
732 | PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
733 | } | |
12e41d03 DL |
734 | |
735 | #ifdef DUMP_PREFIX_LIST | |
d62a17ae | 736 | zlog_debug( |
737 | "%s: DUMP_PREFIX_LIST old_prefix_list=%x old_size=%d new_prefix_list=%x new_size=%d", | |
15569c58 | 738 | __func__, (unsigned)neigh->prefix_list, |
d62a17ae | 739 | neigh->prefix_list ? (int)listcount(neigh->prefix_list) : -1, |
740 | (unsigned)addr_list, | |
741 | addr_list ? (int)listcount(addr_list) : -1); | |
12e41d03 DL |
742 | #endif |
743 | ||
d62a17ae | 744 | if (neigh->prefix_list == addr_list) { |
745 | if (addr_list) { | |
af4c2728 | 746 | flog_err( |
450971aa | 747 | EC_LIB_DEVELOPMENT, |
d62a17ae | 748 | "%s: internal error: trying to replace same prefix list=%p", |
15569c58 | 749 | __func__, (void *)addr_list); |
d62a17ae | 750 | } |
751 | } else { | |
752 | /* Delete existing secondary address list */ | |
753 | delete_prefix_list(neigh); | |
754 | } | |
755 | ||
756 | if (addr_list) { | |
757 | delete_from_neigh_addr(neigh->interface, addr_list, | |
758 | neigh->source_addr); | |
759 | } | |
760 | ||
761 | /* Replace secondary address list */ | |
762 | neigh->prefix_list = addr_list; | |
763 | ||
764 | update_dr_priority(neigh, hello_options, dr_priority); | |
b3a474d8 | 765 | new = PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_LAN_PRUNE_DELAY); |
766 | old = PIM_OPTION_IS_SET(neigh->hello_options, | |
767 | PIM_OPTION_MASK_LAN_PRUNE_DELAY); | |
768 | ||
769 | if (old != new) { | |
770 | if (old) | |
771 | ++pim_ifp->pim_number_of_nonlandelay_neighbors; | |
772 | else | |
773 | --pim_ifp->pim_number_of_nonlandelay_neighbors; | |
774 | } | |
d62a17ae | 775 | /* |
776 | Copy flags | |
777 | */ | |
778 | neigh->hello_options = hello_options; | |
12e41d03 | 779 | } |