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11128587 | 1 | /* |
2a333e0f | 2 | * IP MSDP for Quagga |
11128587 | 3 | * Copyright (C) 2016 Cumulus Networks, Inc. |
11128587 DS |
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 | |
16 | * along with this program; see the file COPYING; if not, write to the | |
17 | * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
18 | * MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <zebra.h> | |
22 | ||
2a333e0f | 23 | #include <lib/hash.h> |
24 | #include <lib/jhash.h> | |
25 | #include <lib/log.h> | |
3c72d654 | 26 | #include <lib/prefix.h> |
2a333e0f | 27 | #include <lib/sockunion.h> |
28 | #include <lib/stream.h> | |
29 | #include <lib/thread.h> | |
3c72d654 | 30 | #include <lib/vty.h> |
31 | #include <lib/plist.h> | |
11128587 | 32 | |
2a333e0f | 33 | #include "pimd.h" |
34 | #include "pim_cmd.h" | |
35 | #include "pim_memory.h" | |
7176984f | 36 | #include "pim_iface.h" |
3c72d654 | 37 | #include "pim_rp.h" |
2a333e0f | 38 | #include "pim_str.h" |
39 | #include "pim_time.h" | |
1bf16443 | 40 | #include "pim_upstream.h" |
11128587 | 41 | |
2a333e0f | 42 | #include "pim_msdp.h" |
43 | #include "pim_msdp_packet.h" | |
44 | #include "pim_msdp_socket.h" | |
45 | ||
46 | struct pim_msdp pim_msdp, *msdp = &pim_msdp; | |
47 | ||
48 | static void pim_msdp_peer_listen(struct pim_msdp_peer *mp); | |
49 | static void pim_msdp_peer_cr_timer_setup(struct pim_msdp_peer *mp, bool start); | |
50 | static void pim_msdp_peer_ka_timer_setup(struct pim_msdp_peer *mp, bool start); | |
51 | static void pim_msdp_peer_hold_timer_setup(struct pim_msdp_peer *mp, bool start); | |
52 | static void pim_msdp_peer_free(struct pim_msdp_peer *mp); | |
3c72d654 | 53 | static void pim_msdp_enable(void); |
54 | static void pim_msdp_sa_adv_timer_setup(bool start); | |
55 | static void pim_msdp_sa_deref(struct pim_msdp_sa *sa, enum pim_msdp_sa_flags flags); | |
977d71cc | 56 | static int pim_msdp_mg_mbr_comp(const void *p1, const void *p2); |
57 | static void pim_msdp_mg_mbr_free(struct pim_msdp_mg_mbr *mbr); | |
58 | static void pim_msdp_mg_mbr_do_del(struct pim_msdp_mg *mg, struct pim_msdp_mg_mbr *mbr); | |
2a333e0f | 59 | |
3c72d654 | 60 | /************************ SA cache management ******************************/ |
3c72d654 | 61 | static void |
62 | pim_msdp_sa_timer_expiry_log(struct pim_msdp_sa *sa, const char *timer_str) | |
63 | { | |
15ad0c71 | 64 | zlog_debug("MSDP SA %s %s timer expired", sa->sg_str, timer_str); |
3c72d654 | 65 | } |
66 | ||
67 | /* RFC-3618:Sec-5.1 - global active source advertisement timer */ | |
68 | static int | |
69 | pim_msdp_sa_adv_timer_cb(struct thread *t) | |
70 | { | |
7667c556 | 71 | msdp->sa_adv_timer = NULL; |
15ad0c71 | 72 | if (PIM_DEBUG_MSDP_EVENTS) { |
3c72d654 | 73 | zlog_debug("MSDP SA advertisment timer expired"); |
74 | } | |
75 | ||
3c72d654 | 76 | pim_msdp_sa_adv_timer_setup(true /* start */); |
69053fb4 | 77 | pim_msdp_pkt_sa_tx(); |
3c72d654 | 78 | return 0; |
79 | } | |
80 | static void | |
81 | pim_msdp_sa_adv_timer_setup(bool start) | |
82 | { | |
83 | THREAD_OFF(msdp->sa_adv_timer); | |
84 | if (start) { | |
85 | THREAD_TIMER_ON(msdp->master, msdp->sa_adv_timer, | |
86 | pim_msdp_sa_adv_timer_cb, NULL, PIM_MSDP_SA_ADVERTISMENT_TIME); | |
87 | } | |
88 | } | |
89 | ||
90 | /* RFC-3618:Sec-5.3 - SA cache state timer */ | |
91 | static int | |
92 | pim_msdp_sa_state_timer_cb(struct thread *t) | |
93 | { | |
94 | struct pim_msdp_sa *sa; | |
95 | ||
3c72d654 | 96 | sa = THREAD_ARG(t); |
7667c556 | 97 | sa->sa_state_timer = NULL; |
3c72d654 | 98 | |
99 | if (PIM_DEBUG_MSDP_EVENTS) { | |
100 | pim_msdp_sa_timer_expiry_log(sa, "state"); | |
101 | } | |
102 | ||
103 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_PEER); | |
104 | return 0; | |
105 | } | |
106 | static void | |
107 | pim_msdp_sa_state_timer_setup(struct pim_msdp_sa *sa, bool start) | |
108 | { | |
109 | THREAD_OFF(sa->sa_state_timer); | |
110 | if (start) { | |
111 | THREAD_TIMER_ON(msdp->master, sa->sa_state_timer, | |
112 | pim_msdp_sa_state_timer_cb, sa, PIM_MSDP_SA_HOLD_TIME); | |
113 | } | |
114 | } | |
115 | ||
7667c556 | 116 | static void |
117 | pim_msdp_sa_upstream_del(struct pim_msdp_sa *sa) | |
118 | { | |
119 | struct pim_upstream *up = sa->up; | |
120 | if (!up) { | |
121 | return; | |
122 | } | |
123 | ||
124 | sa->up = NULL; | |
7667c556 | 125 | if (PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(up->flags)) { |
126 | PIM_UPSTREAM_FLAG_UNSET_SRC_MSDP(up->flags); | |
36e466fe | 127 | sa->flags |= PIM_MSDP_SAF_UP_DEL_IN_PROG; |
7667c556 | 128 | pim_upstream_del(up, __PRETTY_FUNCTION__); |
36e466fe | 129 | sa->flags &= ~PIM_MSDP_SAF_UP_DEL_IN_PROG; |
7667c556 | 130 | } |
131 | ||
132 | if (PIM_DEBUG_MSDP_EVENTS) { | |
15ad0c71 | 133 | zlog_debug("MSDP SA %s de-referenced SPT", sa->sg_str); |
7667c556 | 134 | } |
135 | } | |
136 | ||
137 | static bool | |
138 | pim_msdp_sa_upstream_add_ok(struct pim_msdp_sa *sa, struct pim_upstream *xg_up) | |
139 | { | |
7667c556 | 140 | if (!(sa->flags & PIM_MSDP_SAF_PEER)) { |
141 | /* SA should have been rxed from a peer */ | |
142 | return false; | |
143 | } | |
144 | /* check if we are RP */ | |
145 | if (!I_am_RP(sa->sg.grp)) { | |
146 | return false; | |
147 | } | |
148 | ||
149 | /* check if we have a (*, G) with a non-empty immediate OIL */ | |
150 | if (!xg_up) { | |
151 | struct prefix_sg sg; | |
152 | ||
153 | memset(&sg, 0, sizeof(sg)); | |
154 | sg.grp = sa->sg.grp; | |
155 | ||
156 | xg_up = pim_upstream_find(&sg); | |
157 | } | |
158 | if (!xg_up || (xg_up->join_state != PIM_UPSTREAM_JOINED)) { | |
159 | /* join desired will be true for such (*, G) entries so we will | |
160 | * just look at join_state and let the PIM state machine do the rest of | |
161 | * the magic */ | |
162 | return false; | |
163 | } | |
164 | ||
165 | return true; | |
166 | } | |
167 | ||
168 | /* Upstream add evaluation needs to happen everytime - | |
169 | * 1. Peer reference is added or removed. | |
1bf16443 | 170 | * 2. The RP for a group changes. |
171 | * 3. joinDesired for the associated (*, G) changes | |
172 | * 4. associated (*, G) is removed - this seems like a bit redundant | |
7667c556 | 173 | * (considering #4); but just in case an entry gets nuked without |
174 | * upstream state transition | |
175 | * */ | |
176 | static void | |
177 | pim_msdp_sa_upstream_update(struct pim_msdp_sa *sa, | |
178 | struct pim_upstream *xg_up, const char *ctx) | |
179 | { | |
180 | struct pim_upstream *up; | |
7667c556 | 181 | |
182 | if (!pim_msdp_sa_upstream_add_ok(sa, xg_up)) { | |
183 | pim_msdp_sa_upstream_del(sa); | |
184 | return; | |
185 | } | |
186 | ||
187 | if (sa->up) { | |
188 | /* nothing to do */ | |
189 | return; | |
190 | } | |
191 | ||
192 | up = pim_upstream_find(&sa->sg); | |
193 | if (up && (PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(up->flags))) { | |
194 | /* somehow we lost track of the upstream ptr? best log it */ | |
195 | sa->up = up; | |
196 | if (PIM_DEBUG_MSDP_EVENTS) { | |
15ad0c71 | 197 | zlog_debug("MSDP SA %s SPT reference missing", sa->sg_str); |
7667c556 | 198 | } |
199 | return; | |
200 | } | |
201 | ||
202 | /* RFC3618: "RP triggers a (S, G) join event towards the data source | |
203 | * as if a JP message was rxed addressed to the RP itself." */ | |
204 | up = pim_upstream_add(&sa->sg, NULL /* iif */, | |
205 | PIM_UPSTREAM_FLAG_MASK_SRC_MSDP, | |
206 | __PRETTY_FUNCTION__); | |
207 | ||
208 | sa->up = up; | |
209 | if (up) { | |
210 | /* update inherited oil */ | |
211 | pim_upstream_inherited_olist(up); | |
212 | /* should we also start the kat in parallel? we will need it when the | |
213 | * SA ages out */ | |
214 | if (PIM_DEBUG_MSDP_EVENTS) { | |
15ad0c71 | 215 | zlog_debug("MSDP SA %s referenced SPT", sa->sg_str); |
7667c556 | 216 | } |
217 | } else { | |
218 | if (PIM_DEBUG_MSDP_EVENTS) { | |
15ad0c71 | 219 | zlog_debug("MSDP SA %s SPT reference failed", sa->sg_str); |
7667c556 | 220 | } |
221 | } | |
222 | } | |
223 | ||
3c72d654 | 224 | /* release all mem associated with a sa */ |
225 | static void | |
226 | pim_msdp_sa_free(struct pim_msdp_sa *sa) | |
227 | { | |
228 | XFREE(MTYPE_PIM_MSDP_SA, sa); | |
229 | } | |
230 | ||
231 | static struct pim_msdp_sa * | |
232 | pim_msdp_sa_new(struct prefix_sg *sg, struct in_addr rp) | |
233 | { | |
234 | struct pim_msdp_sa *sa; | |
235 | ||
3c72d654 | 236 | sa = XCALLOC(MTYPE_PIM_MSDP_SA, sizeof(*sa)); |
237 | if (!sa) { | |
238 | zlog_err("%s: PIM XCALLOC(%zu) failure", | |
36e466fe | 239 | __PRETTY_FUNCTION__, sizeof(*sa)); |
3c72d654 | 240 | return NULL; |
241 | } | |
242 | ||
243 | sa->sg = *sg; | |
15ad0c71 | 244 | pim_str_sg_set(sg, sa->sg_str); |
3c72d654 | 245 | sa->rp = rp; |
246 | sa->uptime = pim_time_monotonic_sec(); | |
247 | ||
248 | /* insert into misc tables for easy access */ | |
249 | sa = hash_get(msdp->sa_hash, sa, hash_alloc_intern); | |
250 | if (!sa) { | |
251 | zlog_err("%s: PIM hash get failure", __PRETTY_FUNCTION__); | |
252 | pim_msdp_sa_free(sa); | |
253 | return NULL; | |
254 | } | |
255 | listnode_add_sort(msdp->sa_list, sa); | |
256 | ||
257 | if (PIM_DEBUG_MSDP_EVENTS) { | |
15ad0c71 | 258 | zlog_debug("MSDP SA %s created", sa->sg_str); |
3c72d654 | 259 | } |
260 | ||
261 | return sa; | |
262 | } | |
263 | ||
264 | static struct pim_msdp_sa * | |
265 | pim_msdp_sa_find(struct prefix_sg *sg) | |
266 | { | |
267 | struct pim_msdp_sa lookup; | |
268 | ||
269 | lookup.sg = *sg; | |
270 | return hash_lookup(msdp->sa_hash, &lookup); | |
271 | } | |
272 | ||
273 | static struct pim_msdp_sa * | |
274 | pim_msdp_sa_add(struct prefix_sg *sg, struct in_addr rp) | |
275 | { | |
276 | struct pim_msdp_sa *sa; | |
277 | ||
278 | sa = pim_msdp_sa_find(sg); | |
279 | if (sa) { | |
280 | return sa; | |
281 | } | |
282 | ||
283 | return pim_msdp_sa_new(sg, rp); | |
284 | } | |
285 | ||
286 | static void | |
287 | pim_msdp_sa_del(struct pim_msdp_sa * sa) | |
288 | { | |
7667c556 | 289 | /* this is somewhat redundant - still want to be careful not to leave |
290 | * stale upstream references */ | |
291 | pim_msdp_sa_upstream_del(sa); | |
292 | ||
3c72d654 | 293 | /* stop timers */ |
294 | pim_msdp_sa_state_timer_setup(sa, false /* start */); | |
295 | ||
296 | /* remove the entry from various tables */ | |
297 | listnode_delete(msdp->sa_list, sa); | |
298 | hash_release(msdp->sa_hash, sa); | |
299 | ||
300 | if (PIM_DEBUG_MSDP_EVENTS) { | |
15ad0c71 | 301 | zlog_debug("MSDP SA %s deleted", sa->sg_str); |
3c72d654 | 302 | } |
303 | ||
304 | /* free up any associated memory */ | |
305 | pim_msdp_sa_free(sa); | |
306 | } | |
307 | ||
15ad0c71 | 308 | static void |
11b7753a | 309 | pim_msdp_sa_peer_ip_set(struct pim_msdp_sa *sa, struct pim_msdp_peer *mp, struct in_addr rp) |
15ad0c71 | 310 | { |
311 | struct pim_msdp_peer *old_mp; | |
312 | ||
313 | /* optimize the "no change" case as it will happen | |
314 | * frequently/periodically */ | |
315 | if (mp && (sa->peer.s_addr == mp->peer.s_addr)) { | |
316 | return; | |
317 | } | |
318 | ||
11b7753a | 319 | /* any time the peer ip changes also update the rp address */ |
15ad0c71 | 320 | if (PIM_INADDR_ISNOT_ANY(sa->peer)) { |
321 | old_mp = pim_msdp_peer_find(sa->peer); | |
322 | if (old_mp && old_mp->sa_cnt) { | |
323 | --old_mp->sa_cnt; | |
324 | } | |
325 | } | |
326 | ||
327 | if (mp) { | |
328 | ++mp->sa_cnt; | |
329 | sa->peer = mp->peer; | |
330 | } else { | |
331 | sa->peer.s_addr = PIM_NET_INADDR_ANY; | |
332 | } | |
11b7753a | 333 | sa->rp = rp; |
15ad0c71 | 334 | } |
335 | ||
3c72d654 | 336 | /* When a local active-source is removed there is no way to withdraw the |
337 | * source from peers. We will simply remove it from the SA cache so it will | |
338 | * not be sent in supsequent SA updates. Peers will consequently timeout the | |
339 | * SA. | |
340 | * Similarly a "peer-added" SA is never explicitly deleted. It is simply | |
341 | * aged out overtime if not seen in the SA updates from the peers. | |
342 | * XXX: should we provide a knob to drop entries learnt from a peer when the | |
343 | * peer goes down? */ | |
344 | static void | |
345 | pim_msdp_sa_deref(struct pim_msdp_sa *sa, enum pim_msdp_sa_flags flags) | |
346 | { | |
1bf16443 | 347 | bool update_up = false; |
3c72d654 | 348 | |
3c72d654 | 349 | if ((sa->flags &PIM_MSDP_SAF_LOCAL)) { |
350 | if (flags & PIM_MSDP_SAF_LOCAL) { | |
1bf16443 | 351 | if (PIM_DEBUG_MSDP_EVENTS) { |
15ad0c71 | 352 | zlog_debug("MSDP SA %s local reference removed", sa->sg_str); |
1bf16443 | 353 | } |
3c72d654 | 354 | if (msdp->local_cnt) |
355 | --msdp->local_cnt; | |
356 | } | |
357 | } | |
358 | ||
359 | if ((sa->flags &PIM_MSDP_SAF_PEER)) { | |
360 | if (flags & PIM_MSDP_SAF_PEER) { | |
11b7753a | 361 | struct in_addr rp; |
362 | ||
1bf16443 | 363 | if (PIM_DEBUG_MSDP_EVENTS) { |
15ad0c71 | 364 | zlog_debug("MSDP SA %s peer reference removed", sa->sg_str); |
1bf16443 | 365 | } |
3c72d654 | 366 | pim_msdp_sa_state_timer_setup(sa, false /* start */); |
11b7753a | 367 | rp.s_addr = INADDR_ANY; |
368 | pim_msdp_sa_peer_ip_set(sa, NULL /* mp */, rp); | |
1bf16443 | 369 | /* if peer ref was removed we need to remove the msdp reference on the |
370 | * msdp entry */ | |
371 | update_up = true; | |
3c72d654 | 372 | } |
373 | } | |
374 | ||
375 | sa->flags &= ~flags; | |
1bf16443 | 376 | if (update_up) { |
377 | pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, "sa-deref"); | |
378 | } | |
379 | ||
3c72d654 | 380 | if (!(sa->flags & PIM_MSDP_SAF_REF)) { |
381 | pim_msdp_sa_del(sa); | |
382 | } | |
383 | } | |
384 | ||
385 | void | |
386 | pim_msdp_sa_ref(struct pim_msdp_peer *mp, struct prefix_sg *sg, | |
387 | struct in_addr rp) | |
388 | { | |
389 | struct pim_msdp_sa *sa; | |
3c72d654 | 390 | |
391 | sa = pim_msdp_sa_add(sg, rp); | |
392 | if (!sa) { | |
393 | return; | |
394 | } | |
395 | ||
3c72d654 | 396 | /* reference it */ |
397 | if (mp) { | |
398 | if (!(sa->flags & PIM_MSDP_SAF_PEER)) { | |
399 | sa->flags |= PIM_MSDP_SAF_PEER; | |
400 | if (PIM_DEBUG_MSDP_EVENTS) { | |
15ad0c71 | 401 | zlog_debug("MSDP SA %s added by peer", sa->sg_str); |
3c72d654 | 402 | } |
403 | } | |
11b7753a | 404 | pim_msdp_sa_peer_ip_set(sa, mp, rp); |
3c72d654 | 405 | /* start/re-start the state timer to prevent cache expiry */ |
406 | pim_msdp_sa_state_timer_setup(sa, true /* start */); | |
7667c556 | 407 | /* We re-evaluate SA "SPT-trigger" everytime we hear abt it from a |
408 | * peer. XXX: If this becomes too much of a periodic overhead we | |
409 | * can make it event based */ | |
410 | pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, "peer-ref"); | |
3c72d654 | 411 | } else { |
412 | if (!(sa->flags & PIM_MSDP_SAF_LOCAL)) { | |
413 | sa->flags |= PIM_MSDP_SAF_LOCAL; | |
414 | ++msdp->local_cnt; | |
415 | if (PIM_DEBUG_MSDP_EVENTS) { | |
15ad0c71 | 416 | zlog_debug("MSDP SA %s added locally", sa->sg_str); |
3c72d654 | 417 | } |
7667c556 | 418 | /* send an immediate SA update to peers */ |
3c72d654 | 419 | pim_msdp_pkt_sa_tx_one(sa); |
420 | } | |
421 | sa->flags &= ~PIM_MSDP_SAF_STALE; | |
422 | } | |
423 | } | |
424 | ||
1bf16443 | 425 | /* The following criteria must be met to originate an SA from the MSDP |
426 | * speaker - | |
427 | * 1. KAT must be running i.e. source is active. | |
428 | * 2. We must be RP for the group. | |
429 | * 3. Source must be registrable to the RP (this is where the RFC is vague | |
430 | * and especially ambiguous in CLOS networks; with anycast RP all sources | |
431 | * are potentially registrable to all RPs in the domain). We assume #3 is | |
432 | * satisfied if - | |
433 | * a. We are also the FHR-DR for the source (OR) | |
434 | * b. We rxed a pim register (null or data encapsulated) within the last | |
435 | * (3 * (1.5 * register_suppression_timer))). | |
436 | */ | |
437 | static bool | |
438 | pim_msdp_sa_local_add_ok(struct pim_upstream *up) | |
3c72d654 | 439 | { |
3c72d654 | 440 | if (!(msdp->flags & PIM_MSDPF_ENABLE)) { |
1bf16443 | 441 | return false; |
3c72d654 | 442 | } |
443 | ||
1bf16443 | 444 | if (!up->t_ka_timer) { |
445 | /* stream is not active */ | |
446 | return false; | |
447 | } | |
448 | ||
449 | if (!I_am_RP(up->sg.grp)) { | |
450 | /* we are not RP for the group */ | |
451 | return false; | |
452 | } | |
453 | ||
454 | /* we are the FHR-DR for this stream or we are RP and have seen registers | |
455 | * from a FHR for this source */ | |
456 | if (PIM_UPSTREAM_FLAG_TEST_FHR(up->flags) || up->t_msdp_reg_timer) { | |
457 | return true; | |
3c72d654 | 458 | } |
1bf16443 | 459 | |
460 | return false; | |
461 | } | |
462 | ||
463 | static void | |
464 | pim_msdp_sa_local_add(struct prefix_sg *sg) | |
465 | { | |
466 | struct in_addr rp; | |
3c72d654 | 467 | rp.s_addr = 0; |
468 | pim_msdp_sa_ref(NULL /* mp */, sg, rp); | |
469 | } | |
470 | ||
471 | void | |
472 | pim_msdp_sa_local_del(struct prefix_sg *sg) | |
473 | { | |
474 | struct pim_msdp_sa *sa; | |
475 | ||
3c72d654 | 476 | sa = pim_msdp_sa_find(sg); |
477 | if (sa) { | |
478 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); | |
479 | } | |
480 | } | |
481 | ||
36e466fe | 482 | /* we need to be very cautious with this API as SA del too can trigger an |
483 | * upstream del and we will get stuck in a simple loop */ | |
484 | static void | |
485 | pim_msdp_sa_local_del_on_up_del(struct prefix_sg *sg) | |
486 | { | |
487 | struct pim_msdp_sa *sa; | |
488 | ||
489 | sa = pim_msdp_sa_find(sg); | |
490 | if (sa) { | |
491 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
492 | zlog_debug("MSDP local sa %s del on up del", sa->sg_str); | |
493 | } | |
494 | ||
495 | /* if there is no local reference escape */ | |
496 | if (!(sa->flags & PIM_MSDP_SAF_LOCAL)) { | |
497 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
498 | zlog_debug("MSDP local sa %s del; no local ref", sa->sg_str); | |
499 | } | |
500 | return; | |
501 | } | |
502 | ||
503 | if (sa->flags & PIM_MSDP_SAF_UP_DEL_IN_PROG) { | |
504 | /* MSDP is the one that triggered the upstream del. if this happens | |
505 | * we most certainly have a bug in the PIM upstream state machine. We | |
506 | * will not have a local reference unless the KAT is running. And if the | |
507 | * KAT is running there MUST be an additional source-stream reference to | |
508 | * the flow. Accounting for such cases requires lot of changes; perhaps | |
509 | * address this in the next release? - XXX */ | |
510 | zlog_err("MSDP sa %s SPT teardown is causing the local entry to be removed", sa->sg_str); | |
511 | return; | |
512 | } | |
513 | ||
514 | /* we are dropping the sa on upstream del we should not have an | |
515 | * upstream reference */ | |
516 | if (sa->up) { | |
517 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
518 | zlog_debug("MSDP local sa %s del; up non-NULL", sa->sg_str); | |
519 | } | |
520 | sa->up = NULL; | |
521 | } | |
522 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); | |
523 | } | |
524 | } | |
525 | ||
1bf16443 | 526 | /* Local SA qualification needs to be re-evaluated when - |
527 | * 1. KAT is started or stopped | |
528 | * 2. on RP changes | |
529 | * 3. Whenever FHR status changes for a (S,G) - XXX - currently there | |
530 | * is no clear path to transition an entry out of "MASK_FHR" need | |
531 | * to discuss this with Donald. May result in some strangeness if the | |
532 | * FHR is also the RP. | |
533 | * 4. When msdp_reg timer is started or stopped | |
534 | */ | |
535 | void | |
536 | pim_msdp_sa_local_update(struct pim_upstream *up) | |
537 | { | |
538 | if (pim_msdp_sa_local_add_ok(up)) { | |
539 | pim_msdp_sa_local_add(&up->sg); | |
540 | } else { | |
541 | pim_msdp_sa_local_del(&up->sg); | |
542 | } | |
543 | } | |
544 | ||
3c72d654 | 545 | static void |
546 | pim_msdp_sa_local_setup(void) | |
547 | { | |
548 | struct pim_upstream *up; | |
549 | struct listnode *up_node; | |
550 | ||
551 | for (ALL_LIST_ELEMENTS_RO(pim_upstream_list, up_node, up)) { | |
1bf16443 | 552 | pim_msdp_sa_local_update(up); |
3c72d654 | 553 | } |
554 | } | |
555 | ||
7667c556 | 556 | /* whenever the RP changes we need to re-evaluate the "local" SA-cache */ |
557 | /* XXX: needs to be tested */ | |
3c72d654 | 558 | void |
559 | pim_msdp_i_am_rp_changed(void) | |
560 | { | |
561 | struct listnode *sanode; | |
7176984f | 562 | struct listnode *nextnode; |
3c72d654 | 563 | struct pim_msdp_sa *sa; |
564 | ||
7667c556 | 565 | if (!(msdp->flags & PIM_MSDPF_ENABLE)) { |
566 | /* if the feature is not enabled do nothing */ | |
567 | return; | |
568 | } | |
569 | ||
570 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
571 | zlog_debug("MSDP i_am_rp changed"); | |
572 | } | |
573 | ||
3c72d654 | 574 | /* mark all local entries as stale */ |
575 | for (ALL_LIST_ELEMENTS_RO(msdp->sa_list, sanode, sa)) { | |
7667c556 | 576 | if (sa->flags & PIM_MSDP_SAF_LOCAL) { |
577 | sa->flags |= PIM_MSDP_SAF_STALE; | |
578 | } | |
3c72d654 | 579 | } |
580 | ||
581 | /* re-setup local SA entries */ | |
582 | pim_msdp_sa_local_setup(); | |
583 | ||
7176984f | 584 | for (ALL_LIST_ELEMENTS(msdp->sa_list, sanode, nextnode, sa)) { |
7667c556 | 585 | /* purge stale SA entries */ |
3c72d654 | 586 | if (sa->flags & PIM_MSDP_SAF_STALE) { |
7667c556 | 587 | /* clear the stale flag; the entry may be kept even after |
588 | * "local-deref" */ | |
589 | sa->flags &= ~PIM_MSDP_SAF_STALE; | |
7176984f | 590 | /* sa_deref can end up freeing the sa; so don't access contents after */ |
3c72d654 | 591 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); |
7176984f | 592 | } else { |
593 | /* if the souce is still active check if we can influence SPT */ | |
594 | pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, "rp-change"); | |
3c72d654 | 595 | } |
7667c556 | 596 | } |
597 | } | |
598 | ||
599 | /* We track the join state of (*, G) entries. If G has sources in the SA-cache | |
600 | * we need to setup or teardown SPT when the JoinDesired status changes for | |
601 | * (*, G) */ | |
602 | void | |
603 | pim_msdp_up_join_state_changed(struct pim_upstream *xg_up) | |
604 | { | |
605 | struct listnode *sanode; | |
606 | struct pim_msdp_sa *sa; | |
607 | ||
608 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
8bfb8b67 | 609 | zlog_debug("MSDP join state changed for %s", xg_up->sg_str); |
7667c556 | 610 | } |
611 | ||
612 | /* If this is not really an XG entry just move on */ | |
613 | if ((xg_up->sg.src.s_addr != INADDR_ANY) || | |
614 | (xg_up->sg.grp.s_addr == INADDR_ANY)) { | |
615 | return; | |
616 | } | |
617 | ||
618 | /* XXX: Need to maintain SAs per-group to avoid all this unnecessary | |
619 | * walking */ | |
620 | for (ALL_LIST_ELEMENTS_RO(msdp->sa_list, sanode, sa)) { | |
621 | if (sa->sg.grp.s_addr != xg_up->sg.grp.s_addr) { | |
622 | continue; | |
623 | } | |
624 | pim_msdp_sa_upstream_update(sa, xg_up, "up-jp-change"); | |
625 | } | |
626 | } | |
627 | ||
36e466fe | 628 | static void |
7667c556 | 629 | pim_msdp_up_xg_del(struct prefix_sg *sg) |
630 | { | |
631 | struct listnode *sanode; | |
632 | struct pim_msdp_sa *sa; | |
633 | ||
634 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
635 | zlog_debug("MSDP %s del", pim_str_sg_dump(sg)); | |
636 | } | |
637 | ||
638 | /* If this is not really an XG entry just move on */ | |
639 | if ((sg->src.s_addr != INADDR_ANY) || | |
640 | (sg->grp.s_addr == INADDR_ANY)) { | |
641 | return; | |
642 | } | |
643 | ||
644 | /* XXX: Need to maintain SAs per-group to avoid all this unnecessary | |
645 | * walking */ | |
646 | for (ALL_LIST_ELEMENTS_RO(msdp->sa_list, sanode, sa)) { | |
647 | if (sa->sg.grp.s_addr != sg->grp.s_addr) { | |
648 | continue; | |
649 | } | |
650 | pim_msdp_sa_upstream_update(sa, NULL /* xg */, "up-jp-change"); | |
3c72d654 | 651 | } |
652 | } | |
653 | ||
36e466fe | 654 | void |
655 | pim_msdp_up_del(struct prefix_sg *sg) | |
656 | { | |
657 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
658 | zlog_debug("MSDP up %s del", pim_str_sg_dump(sg)); | |
659 | } | |
660 | if (sg->src.s_addr == INADDR_ANY) { | |
661 | pim_msdp_up_xg_del(sg); | |
662 | } else { | |
663 | pim_msdp_sa_local_del_on_up_del(sg); | |
664 | } | |
665 | } | |
666 | ||
3c72d654 | 667 | /* sa hash and peer list helpers */ |
668 | static unsigned int | |
669 | pim_msdp_sa_hash_key_make(void *p) | |
670 | { | |
671 | struct pim_msdp_sa *sa = p; | |
672 | ||
673 | return (jhash_2words(sa->sg.src.s_addr, sa->sg.grp.s_addr, 0)); | |
674 | } | |
675 | ||
676 | static int | |
677 | pim_msdp_sa_hash_eq(const void *p1, const void *p2) | |
678 | { | |
679 | const struct pim_msdp_sa *sa1 = p1; | |
680 | const struct pim_msdp_sa *sa2 = p2; | |
681 | ||
682 | return ((sa1->sg.src.s_addr == sa2->sg.src.s_addr) && | |
683 | (sa1->sg.grp.s_addr == sa2->sg.grp.s_addr)); | |
684 | } | |
685 | ||
686 | static int | |
687 | pim_msdp_sa_comp(const void *p1, const void *p2) | |
688 | { | |
689 | const struct pim_msdp_sa *sa1 = p1; | |
690 | const struct pim_msdp_sa *sa2 = p2; | |
691 | ||
692 | if (ntohl(sa1->sg.grp.s_addr) < ntohl(sa2->sg.grp.s_addr)) | |
693 | return -1; | |
694 | ||
695 | if (ntohl(sa1->sg.grp.s_addr) > ntohl(sa2->sg.grp.s_addr)) | |
696 | return 1; | |
697 | ||
698 | if (ntohl(sa1->sg.src.s_addr) < ntohl(sa2->sg.src.s_addr)) | |
699 | return -1; | |
700 | ||
701 | if (ntohl(sa1->sg.src.s_addr) > ntohl(sa2->sg.src.s_addr)) | |
702 | return 1; | |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
707 | /* RFC-3618:Sec-10.1.3 - Peer-RPF forwarding */ | |
708 | /* XXX: this can use a bit of refining and extensions */ | |
709 | bool | |
710 | pim_msdp_peer_rpf_check(struct pim_msdp_peer *mp, struct in_addr rp) | |
711 | { | |
712 | if (mp->peer.s_addr == rp.s_addr) { | |
713 | return true; | |
714 | } | |
715 | ||
716 | return false; | |
717 | } | |
718 | ||
719 | /************************ Peer session management **************************/ | |
2a333e0f | 720 | char * |
721 | pim_msdp_state_dump(enum pim_msdp_peer_state state, char *buf, int buf_size) | |
722 | { | |
723 | switch (state) { | |
724 | case PIM_MSDP_DISABLED: | |
725 | snprintf(buf, buf_size, "%s", "disabled"); | |
726 | break; | |
727 | case PIM_MSDP_INACTIVE: | |
728 | snprintf(buf, buf_size, "%s", "inactive"); | |
729 | break; | |
730 | case PIM_MSDP_LISTEN: | |
731 | snprintf(buf, buf_size, "%s", "listen"); | |
732 | break; | |
733 | case PIM_MSDP_CONNECTING: | |
734 | snprintf(buf, buf_size, "%s", "connecting"); | |
735 | break; | |
736 | case PIM_MSDP_ESTABLISHED: | |
737 | snprintf(buf, buf_size, "%s", "established"); | |
738 | break; | |
739 | default: | |
740 | snprintf(buf, buf_size, "unk-%d", state); | |
741 | } | |
742 | return buf; | |
743 | } | |
744 | ||
745 | char * | |
746 | pim_msdp_peer_key_dump(struct pim_msdp_peer *mp, char *buf, int buf_size, bool long_format) | |
747 | { | |
748 | char peer_str[INET_ADDRSTRLEN]; | |
749 | char local_str[INET_ADDRSTRLEN]; | |
750 | ||
751 | pim_inet4_dump("<peer?>", mp->peer, peer_str, sizeof(peer_str)); | |
752 | if (long_format) { | |
753 | pim_inet4_dump("<local?>", mp->local, local_str, sizeof(local_str)); | |
754 | snprintf(buf, buf_size, "MSDP peer %s local %s mg %s", | |
755 | peer_str, local_str, mp->mesh_group_name); | |
756 | } else { | |
757 | snprintf(buf, buf_size, "MSDP peer %s", peer_str); | |
758 | } | |
759 | ||
760 | return buf; | |
761 | } | |
762 | ||
763 | static void | |
764 | pim_msdp_peer_state_chg_log(struct pim_msdp_peer *mp) | |
765 | { | |
766 | char state_str[PIM_MSDP_STATE_STRLEN]; | |
2a333e0f | 767 | |
768 | pim_msdp_state_dump(mp->state, state_str, sizeof(state_str)); | |
15ad0c71 | 769 | zlog_debug("MSDP peer %s state chg to %s", mp->key_str, state_str); |
2a333e0f | 770 | } |
771 | ||
772 | /* MSDP Connection State Machine actions (defined in RFC-3618:Sec-11.2) */ | |
773 | /* 11.2.A2: active peer - start connect retry timer; when the timer fires | |
774 | * a tcp connection will be made */ | |
775 | static void | |
776 | pim_msdp_peer_connect(struct pim_msdp_peer *mp) | |
777 | { | |
778 | mp->state = PIM_MSDP_CONNECTING; | |
779 | if (PIM_DEBUG_MSDP_EVENTS) { | |
780 | pim_msdp_peer_state_chg_log(mp); | |
781 | } | |
782 | ||
783 | pim_msdp_peer_cr_timer_setup(mp, true /* start */); | |
784 | } | |
785 | ||
786 | /* 11.2.A3: passive peer - just listen for connections */ | |
787 | static void | |
788 | pim_msdp_peer_listen(struct pim_msdp_peer *mp) | |
789 | { | |
790 | mp->state = PIM_MSDP_LISTEN; | |
791 | if (PIM_DEBUG_MSDP_EVENTS) { | |
792 | pim_msdp_peer_state_chg_log(mp); | |
793 | } | |
794 | ||
795 | /* this is interntionally asymmetric i.e. we set up listen-socket when the | |
796 | * first listening peer is configured; but don't bother tearing it down when | |
797 | * all the peers go down */ | |
798 | pim_msdp_sock_listen(); | |
799 | } | |
800 | ||
801 | /* 11.2.A4 and 11.2.A5: transition active or passive peer to | |
802 | * established state */ | |
803 | void | |
804 | pim_msdp_peer_established(struct pim_msdp_peer *mp) | |
805 | { | |
977d71cc | 806 | if (mp->state != PIM_MSDP_ESTABLISHED) { |
807 | ++mp->est_flaps; | |
808 | } | |
809 | ||
2a333e0f | 810 | mp->state = PIM_MSDP_ESTABLISHED; |
811 | mp->uptime = pim_time_monotonic_sec(); | |
812 | ||
813 | if (PIM_DEBUG_MSDP_EVENTS) { | |
814 | pim_msdp_peer_state_chg_log(mp); | |
815 | } | |
816 | ||
817 | /* stop retry timer on active peers */ | |
818 | pim_msdp_peer_cr_timer_setup(mp, false /* start */); | |
819 | ||
820 | /* send KA; start KA and hold timers */ | |
821 | pim_msdp_pkt_ka_tx(mp); | |
822 | pim_msdp_peer_ka_timer_setup(mp, true /* start */); | |
823 | pim_msdp_peer_hold_timer_setup(mp, true /* start */); | |
824 | ||
3c72d654 | 825 | pim_msdp_pkt_sa_tx_to_one_peer(mp); |
826 | ||
2a333e0f | 827 | PIM_MSDP_PEER_WRITE_ON(mp); |
828 | PIM_MSDP_PEER_READ_ON(mp); | |
829 | } | |
830 | ||
831 | /* 11.2.A6, 11.2.A7 and 11.2.A8: shutdown the peer tcp connection */ | |
832 | void | |
833 | pim_msdp_peer_stop_tcp_conn(struct pim_msdp_peer *mp, bool chg_state) | |
834 | { | |
835 | if (chg_state) { | |
977d71cc | 836 | if (mp->state == PIM_MSDP_ESTABLISHED) { |
837 | ++mp->est_flaps; | |
838 | } | |
2a333e0f | 839 | mp->state = PIM_MSDP_INACTIVE; |
840 | if (PIM_DEBUG_MSDP_EVENTS) { | |
841 | pim_msdp_peer_state_chg_log(mp); | |
842 | } | |
843 | } | |
844 | ||
7667c556 | 845 | if (PIM_DEBUG_MSDP_INTERNAL) { |
15ad0c71 | 846 | zlog_debug("MSDP peer %s pim_msdp_peer_stop_tcp_conn", mp->key_str); |
7667c556 | 847 | } |
2a333e0f | 848 | /* stop read and write threads */ |
849 | PIM_MSDP_PEER_READ_OFF(mp); | |
850 | PIM_MSDP_PEER_WRITE_OFF(mp); | |
851 | ||
852 | /* reset buffers */ | |
3e5e4225 | 853 | mp->packet_size = 0; |
2a333e0f | 854 | if (mp->ibuf) |
855 | stream_reset(mp->ibuf); | |
856 | if (mp->obuf) | |
857 | stream_fifo_clean(mp->obuf); | |
858 | ||
859 | /* stop all peer timers */ | |
860 | pim_msdp_peer_ka_timer_setup(mp, false /* start */); | |
861 | pim_msdp_peer_cr_timer_setup(mp, false /* start */); | |
862 | pim_msdp_peer_hold_timer_setup(mp, false /* start */); | |
863 | ||
864 | /* close connection */ | |
865 | if (mp->fd >= 0) { | |
866 | close(mp->fd); | |
867 | mp->fd = -1; | |
868 | } | |
869 | } | |
870 | ||
871 | /* RFC-3618:Sec-5.6 - stop the peer tcp connection and startover */ | |
872 | void | |
873 | pim_msdp_peer_reset_tcp_conn(struct pim_msdp_peer *mp, const char *rc_str) | |
874 | { | |
875 | if (PIM_DEBUG_EVENTS) { | |
15ad0c71 | 876 | zlog_debug("MSDP peer %s tcp reset %s", mp->key_str, rc_str); |
977d71cc | 877 | snprintf(mp->last_reset, sizeof(mp->last_reset), "%s", rc_str); |
2a333e0f | 878 | } |
879 | ||
880 | /* close the connection and transition to listening or connecting */ | |
881 | pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */); | |
882 | if (PIM_MSDP_PEER_IS_LISTENER(mp)) { | |
883 | pim_msdp_peer_listen(mp); | |
884 | } else { | |
885 | pim_msdp_peer_connect(mp); | |
886 | } | |
887 | } | |
888 | ||
889 | static void | |
890 | pim_msdp_peer_timer_expiry_log(struct pim_msdp_peer *mp, const char *timer_str) | |
891 | { | |
15ad0c71 | 892 | zlog_debug("MSDP peer %s %s timer expired", mp->key_str, timer_str); |
2a333e0f | 893 | } |
894 | ||
895 | /* RFC-3618:Sec-5.4 - peer hold timer */ | |
896 | static int | |
897 | pim_msdp_peer_hold_timer_cb(struct thread *t) | |
898 | { | |
899 | struct pim_msdp_peer *mp; | |
900 | ||
2a333e0f | 901 | mp = THREAD_ARG(t); |
7667c556 | 902 | mp->hold_timer = NULL; |
2a333e0f | 903 | |
904 | if (PIM_DEBUG_MSDP_EVENTS) { | |
905 | pim_msdp_peer_timer_expiry_log(mp, "hold"); | |
906 | } | |
907 | ||
908 | if (mp->state != PIM_MSDP_ESTABLISHED) { | |
909 | return 0; | |
910 | } | |
911 | ||
912 | if (PIM_DEBUG_MSDP_EVENTS) { | |
913 | pim_msdp_peer_state_chg_log(mp); | |
914 | } | |
915 | pim_msdp_peer_reset_tcp_conn(mp, "ht-expired"); | |
916 | return 0; | |
917 | } | |
918 | static void | |
919 | pim_msdp_peer_hold_timer_setup(struct pim_msdp_peer *mp, bool start) | |
920 | { | |
921 | THREAD_OFF(mp->hold_timer); | |
922 | if (start) { | |
923 | THREAD_TIMER_ON(msdp->master, mp->hold_timer, | |
924 | pim_msdp_peer_hold_timer_cb, mp, PIM_MSDP_PEER_HOLD_TIME); | |
925 | } | |
926 | } | |
927 | ||
928 | ||
929 | /* RFC-3618:Sec-5.5 - peer keepalive timer */ | |
930 | static int | |
931 | pim_msdp_peer_ka_timer_cb(struct thread *t) | |
932 | { | |
933 | struct pim_msdp_peer *mp; | |
934 | ||
2a333e0f | 935 | mp = THREAD_ARG(t); |
7667c556 | 936 | mp->ka_timer = NULL; |
2a333e0f | 937 | |
938 | if (PIM_DEBUG_MSDP_EVENTS) { | |
939 | pim_msdp_peer_timer_expiry_log(mp, "ka"); | |
940 | } | |
941 | ||
2a333e0f | 942 | pim_msdp_pkt_ka_tx(mp); |
943 | pim_msdp_peer_ka_timer_setup(mp, true /* start */); | |
944 | return 0; | |
945 | } | |
2a333e0f | 946 | static void |
947 | pim_msdp_peer_ka_timer_setup(struct pim_msdp_peer *mp, bool start) | |
948 | { | |
949 | THREAD_OFF(mp->ka_timer); | |
950 | if (start) { | |
951 | THREAD_TIMER_ON(msdp->master, mp->ka_timer, | |
952 | pim_msdp_peer_ka_timer_cb, mp, PIM_MSDP_PEER_KA_TIME); | |
953 | } | |
954 | } | |
955 | ||
956 | static void | |
957 | pim_msdp_peer_active_connect(struct pim_msdp_peer *mp) | |
958 | { | |
959 | int rc; | |
977d71cc | 960 | ++mp->conn_attempts; |
2a333e0f | 961 | rc = pim_msdp_sock_connect(mp); |
962 | ||
963 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
15ad0c71 | 964 | zlog_debug("MSDP peer %s pim_msdp_peer_active_connect: %d", mp->key_str, rc); |
2a333e0f | 965 | } |
966 | ||
967 | switch (rc) { | |
968 | case connect_error: | |
977d71cc | 969 | case -1: |
2a333e0f | 970 | /* connect failed restart the connect-retry timer */ |
971 | pim_msdp_peer_cr_timer_setup(mp, true /* start */); | |
972 | break; | |
973 | ||
974 | case connect_success: | |
975 | /* connect was sucessful move to established */ | |
976 | pim_msdp_peer_established(mp); | |
977 | break; | |
978 | ||
979 | case connect_in_progress: | |
980 | /* for NB content we need to wait till sock is readable or | |
981 | * writeable */ | |
982 | PIM_MSDP_PEER_WRITE_ON(mp); | |
983 | PIM_MSDP_PEER_READ_ON(mp); | |
984 | /* also restart connect-retry timer to reset the socket if connect is | |
985 | * not sucessful */ | |
986 | pim_msdp_peer_cr_timer_setup(mp, true /* start */); | |
987 | break; | |
988 | } | |
989 | } | |
990 | ||
991 | /* RFC-3618:Sec-5.6 - connection retry on active peer */ | |
992 | static int | |
993 | pim_msdp_peer_cr_timer_cb(struct thread *t) | |
994 | { | |
995 | struct pim_msdp_peer *mp; | |
996 | ||
2a333e0f | 997 | mp = THREAD_ARG(t); |
7667c556 | 998 | mp->cr_timer = NULL; |
2a333e0f | 999 | |
1000 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1001 | pim_msdp_peer_timer_expiry_log(mp, "connect-retry"); | |
1002 | } | |
1003 | ||
1004 | if (mp->state != PIM_MSDP_CONNECTING || PIM_MSDP_PEER_IS_LISTENER(mp)) { | |
1005 | return 0; | |
1006 | } | |
1007 | ||
1008 | pim_msdp_peer_active_connect(mp); | |
1009 | return 0; | |
1010 | } | |
1011 | static void | |
1012 | pim_msdp_peer_cr_timer_setup(struct pim_msdp_peer *mp, bool start) | |
1013 | { | |
1014 | THREAD_OFF(mp->cr_timer); | |
1015 | if (start) { | |
1016 | THREAD_TIMER_ON(msdp->master, mp->cr_timer, | |
1017 | pim_msdp_peer_cr_timer_cb, mp, PIM_MSDP_PEER_CONNECT_RETRY_TIME); | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | /* if a valid packet is rxed from the peer we can restart hold timer */ | |
11128587 | 1022 | void |
2a333e0f | 1023 | pim_msdp_peer_pkt_rxed(struct pim_msdp_peer *mp) |
1024 | { | |
1025 | if (mp->state == PIM_MSDP_ESTABLISHED) { | |
1026 | pim_msdp_peer_hold_timer_setup(mp, true /* start */); | |
1027 | } | |
1028 | } | |
1029 | ||
3c72d654 | 1030 | /* if a valid packet is txed to the peer we can restart ka timer and avoid |
1031 | * unnecessary ka noise in the network */ | |
1032 | void | |
1033 | pim_msdp_peer_pkt_txed(struct pim_msdp_peer *mp) | |
1034 | { | |
1035 | if (mp->state == PIM_MSDP_ESTABLISHED) { | |
1036 | pim_msdp_peer_ka_timer_setup(mp, true /* start */); | |
69053fb4 | 1037 | if (PIM_DEBUG_MSDP_INTERNAL) { |
1038 | zlog_debug("MSDP ka timer restart on pkt tx to %s", mp->key_str); | |
1039 | } | |
3c72d654 | 1040 | } |
1041 | } | |
1042 | ||
2a333e0f | 1043 | static void pim_msdp_addr2su(union sockunion *su, struct in_addr addr) |
1044 | { | |
1045 | sockunion_init(su); | |
1046 | su->sin.sin_addr = addr; | |
1047 | su->sin.sin_family = AF_INET; | |
1048 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
1049 | su->sin.sin_len = sizeof(struct sockaddr_in); | |
1050 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
1051 | } | |
1052 | ||
1053 | /* 11.2.A1: create a new peer and transition state to listen or connecting */ | |
1054 | static enum pim_msdp_err | |
1055 | pim_msdp_peer_new(struct in_addr peer_addr, struct in_addr local_addr, | |
977d71cc | 1056 | const char *mesh_group_name, struct pim_msdp_peer **mp_p) |
2a333e0f | 1057 | { |
1058 | struct pim_msdp_peer *mp; | |
1059 | ||
3c72d654 | 1060 | pim_msdp_enable(); |
1061 | ||
2a333e0f | 1062 | mp = XCALLOC(MTYPE_PIM_MSDP_PEER, sizeof(*mp)); |
1063 | if (!mp) { | |
1064 | zlog_err("%s: PIM XCALLOC(%zu) failure", | |
1065 | __PRETTY_FUNCTION__, sizeof(*mp)); | |
1066 | return PIM_MSDP_ERR_OOM; | |
1067 | } | |
1068 | ||
1069 | mp->peer = peer_addr; | |
15ad0c71 | 1070 | pim_inet4_dump("<peer?>", mp->peer, mp->key_str, sizeof(mp->key_str)); |
2a333e0f | 1071 | pim_msdp_addr2su(&mp->su_peer, mp->peer); |
1072 | mp->local = local_addr; | |
3c72d654 | 1073 | /* XXX: originator_id setting needs to move to the mesh group */ |
1074 | msdp->originator_id = local_addr; | |
2a333e0f | 1075 | pim_msdp_addr2su(&mp->su_local, mp->local); |
977d71cc | 1076 | mp->mesh_group_name = XSTRDUP(MTYPE_PIM_MSDP_MG_NAME, mesh_group_name); |
2a333e0f | 1077 | mp->state = PIM_MSDP_INACTIVE; |
1078 | mp->fd = -1; | |
977d71cc | 1079 | strcpy(mp->last_reset, "-"); |
2a333e0f | 1080 | /* higher IP address is listener */ |
1081 | if (ntohl(mp->local.s_addr) > ntohl(mp->peer.s_addr)) { | |
1082 | mp->flags |= PIM_MSDP_PEERF_LISTENER; | |
1083 | } | |
1084 | ||
2a333e0f | 1085 | /* setup packet buffers */ |
1086 | mp->ibuf = stream_new(PIM_MSDP_MAX_PACKET_SIZE); | |
1087 | mp->obuf = stream_fifo_new(); | |
1088 | ||
1089 | /* insert into misc tables for easy access */ | |
1090 | mp = hash_get(msdp->peer_hash, mp, hash_alloc_intern); | |
2a333e0f | 1091 | listnode_add_sort(msdp->peer_list, mp); |
1092 | ||
1093 | if (PIM_DEBUG_MSDP_EVENTS) { | |
15ad0c71 | 1094 | zlog_debug("MSDP peer %s created", mp->key_str); |
3c72d654 | 1095 | |
2a333e0f | 1096 | pim_msdp_peer_state_chg_log(mp); |
1097 | } | |
3c72d654 | 1098 | |
2a333e0f | 1099 | /* fireup the connect state machine */ |
1100 | if (PIM_MSDP_PEER_IS_LISTENER(mp)) { | |
1101 | pim_msdp_peer_listen(mp); | |
1102 | } else { | |
1103 | pim_msdp_peer_connect(mp); | |
1104 | } | |
977d71cc | 1105 | if (mp_p) { |
1106 | *mp_p = mp; | |
1107 | } | |
2a333e0f | 1108 | return PIM_MSDP_ERR_NONE; |
1109 | } | |
1110 | ||
1111 | struct pim_msdp_peer * | |
1112 | pim_msdp_peer_find(struct in_addr peer_addr) | |
1113 | { | |
1114 | struct pim_msdp_peer lookup; | |
1115 | ||
1116 | lookup.peer = peer_addr; | |
1117 | return hash_lookup(msdp->peer_hash, &lookup); | |
1118 | } | |
1119 | ||
1120 | /* add peer configuration if it doesn't already exist */ | |
1121 | enum pim_msdp_err | |
1122 | pim_msdp_peer_add(struct in_addr peer_addr, struct in_addr local_addr, | |
977d71cc | 1123 | const char *mesh_group_name, struct pim_msdp_peer **mp_p) |
2a333e0f | 1124 | { |
1125 | struct pim_msdp_peer *mp; | |
1126 | ||
977d71cc | 1127 | if (mp_p) { |
1128 | *mp_p = NULL; | |
1129 | } | |
1130 | ||
1131 | if (peer_addr.s_addr == local_addr.s_addr) { | |
1132 | /* skip session setup if config is invalid */ | |
1133 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1134 | char peer_str[INET_ADDRSTRLEN]; | |
1135 | ||
1136 | pim_inet4_dump("<peer?>", peer_addr, peer_str, sizeof(peer_str)); | |
1137 | zlog_debug("%s add skipped as DIP=SIP", peer_str); | |
1138 | } | |
1139 | return PIM_MSDP_ERR_SIP_EQ_DIP; | |
1140 | } | |
1141 | ||
2a333e0f | 1142 | mp = pim_msdp_peer_find(peer_addr); |
1143 | if (mp) { | |
977d71cc | 1144 | if (mp_p) { |
1145 | *mp_p = mp; | |
1146 | } | |
2a333e0f | 1147 | return PIM_MSDP_ERR_PEER_EXISTS; |
1148 | } | |
1149 | ||
977d71cc | 1150 | return pim_msdp_peer_new(peer_addr, local_addr, mesh_group_name, mp_p); |
2a333e0f | 1151 | } |
1152 | ||
1153 | /* release all mem associated with a peer */ | |
1154 | static void | |
1155 | pim_msdp_peer_free(struct pim_msdp_peer *mp) | |
11128587 | 1156 | { |
2a333e0f | 1157 | if (mp->ibuf) { |
1158 | stream_free(mp->ibuf); | |
1159 | } | |
1160 | ||
1161 | if (mp->obuf) { | |
1162 | stream_fifo_free(mp->obuf); | |
1163 | } | |
1164 | ||
1165 | if (mp->mesh_group_name) { | |
977d71cc | 1166 | XFREE(MTYPE_PIM_MSDP_MG_NAME, mp->mesh_group_name); |
2a333e0f | 1167 | } |
1168 | XFREE(MTYPE_PIM_MSDP_PEER, mp); | |
1169 | } | |
1170 | ||
1171 | /* delete the peer config */ | |
977d71cc | 1172 | static enum pim_msdp_err |
1173 | pim_msdp_peer_do_del(struct pim_msdp_peer *mp) | |
2a333e0f | 1174 | { |
2a333e0f | 1175 | /* stop the tcp connection and shutdown all timers */ |
1176 | pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */); | |
1177 | ||
1178 | /* remove the session from various tables */ | |
1179 | listnode_delete(msdp->peer_list, mp); | |
1180 | hash_release(msdp->peer_hash, mp); | |
1181 | ||
1182 | if (PIM_DEBUG_MSDP_EVENTS) { | |
15ad0c71 | 1183 | zlog_debug("MSDP peer %s deleted", mp->key_str); |
2a333e0f | 1184 | } |
1185 | ||
1186 | /* free up any associated memory */ | |
1187 | pim_msdp_peer_free(mp); | |
1188 | ||
1189 | return PIM_MSDP_ERR_NONE; | |
1190 | } | |
1191 | ||
977d71cc | 1192 | enum pim_msdp_err |
1193 | pim_msdp_peer_del(struct in_addr peer_addr) | |
1194 | { | |
1195 | struct pim_msdp_peer *mp; | |
1196 | ||
1197 | mp = pim_msdp_peer_find(peer_addr); | |
1198 | if (!mp) { | |
1199 | return PIM_MSDP_ERR_NO_PEER; | |
1200 | } | |
1201 | ||
1202 | return pim_msdp_peer_do_del(mp); | |
1203 | } | |
1204 | ||
2a333e0f | 1205 | /* peer hash and peer list helpers */ |
1206 | static unsigned int | |
1207 | pim_msdp_peer_hash_key_make(void *p) | |
1208 | { | |
1209 | struct pim_msdp_peer *mp = p; | |
1210 | return (jhash_1word(mp->peer.s_addr, 0)); | |
1211 | } | |
1212 | ||
1213 | static int | |
1214 | pim_msdp_peer_hash_eq(const void *p1, const void *p2) | |
1215 | { | |
1216 | const struct pim_msdp_peer *mp1 = p1; | |
1217 | const struct pim_msdp_peer *mp2 = p2; | |
1218 | ||
1219 | return (mp1->peer.s_addr == mp2->peer.s_addr); | |
1220 | } | |
1221 | ||
1222 | static int | |
1223 | pim_msdp_peer_comp(const void *p1, const void *p2) | |
1224 | { | |
1225 | const struct pim_msdp_peer *mp1 = p1; | |
1226 | const struct pim_msdp_peer *mp2 = p2; | |
1227 | ||
1228 | if (ntohl(mp1->peer.s_addr) < ntohl(mp2->peer.s_addr)) | |
1229 | return -1; | |
1230 | ||
1231 | if (ntohl(mp1->peer.s_addr) > ntohl(mp2->peer.s_addr)) | |
1232 | return 1; | |
1233 | ||
1234 | return 0; | |
1235 | } | |
1236 | ||
977d71cc | 1237 | /************************** Mesh group management **************************/ |
1238 | static void | |
1239 | pim_msdp_mg_free(struct pim_msdp_mg *mg) | |
1240 | { | |
1241 | /* If the mesh-group has valid member or src_ip don't delete it */ | |
1242 | if (!mg || mg->mbr_cnt || (mg->src_ip.s_addr != INADDR_ANY)) { | |
1243 | return; | |
1244 | } | |
1245 | ||
1246 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1247 | zlog_debug("MSDP mesh-group %s deleted", mg->mesh_group_name); | |
1248 | } | |
1249 | if (mg->mesh_group_name) | |
1250 | XFREE(MTYPE_PIM_MSDP_MG_NAME, mg->mesh_group_name); | |
977d71cc | 1251 | |
7176984f | 1252 | if (mg->mbr_list) |
1253 | list_free(mg->mbr_list); | |
b9b1e1f2 | 1254 | |
1255 | XFREE(MTYPE_PIM_MSDP_MG, mg); | |
977d71cc | 1256 | msdp->mg = NULL; |
1257 | } | |
1258 | ||
1259 | static struct pim_msdp_mg * | |
1260 | pim_msdp_mg_new(const char *mesh_group_name) | |
1261 | { | |
1262 | struct pim_msdp_mg *mg; | |
1263 | ||
1264 | mg = XCALLOC(MTYPE_PIM_MSDP_MG, sizeof(*mg)); | |
1265 | if (!mg) { | |
1266 | zlog_err("%s: PIM XCALLOC(%zu) failure", | |
1267 | __PRETTY_FUNCTION__, sizeof(*mg)); | |
1268 | return NULL; | |
1269 | } | |
1270 | ||
1271 | mg->mesh_group_name = XSTRDUP(MTYPE_PIM_MSDP_MG_NAME, mesh_group_name); | |
1272 | mg->mbr_list = list_new(); | |
1273 | mg->mbr_list->del = (void (*)(void *))pim_msdp_mg_mbr_free; | |
1274 | mg->mbr_list->cmp = (int (*)(void *, void *))pim_msdp_mg_mbr_comp; | |
1275 | ||
1276 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1277 | zlog_debug("MSDP mesh-group %s created", mg->mesh_group_name); | |
1278 | } | |
1279 | return mg; | |
1280 | } | |
1281 | ||
1282 | enum pim_msdp_err | |
1283 | pim_msdp_mg_del(const char *mesh_group_name) | |
1284 | { | |
1285 | struct pim_msdp_mg *mg = msdp->mg; | |
1286 | struct pim_msdp_mg_mbr *mbr; | |
1287 | ||
1288 | if (!mg || strcmp(mg->mesh_group_name, mesh_group_name)) { | |
1289 | return PIM_MSDP_ERR_NO_MG; | |
1290 | } | |
1291 | ||
1292 | /* delete all the mesh-group members */ | |
1293 | while (!list_isempty(mg->mbr_list)) { | |
1294 | mbr = listnode_head(mg->mbr_list); | |
1295 | pim_msdp_mg_mbr_do_del(mg, mbr); | |
1296 | } | |
1297 | ||
1298 | /* clear src ip */ | |
1299 | mg->src_ip.s_addr = INADDR_ANY; | |
1300 | ||
1301 | /* free up the mesh-group */ | |
1302 | pim_msdp_mg_free(mg); | |
1303 | return PIM_MSDP_ERR_NONE; | |
1304 | } | |
1305 | ||
1306 | static enum pim_msdp_err | |
1307 | pim_msdp_mg_add(const char *mesh_group_name) | |
1308 | { | |
1309 | if (msdp->mg) { | |
1310 | if (!strcmp(msdp->mg->mesh_group_name, mesh_group_name)) { | |
1311 | return PIM_MSDP_ERR_NONE; | |
1312 | } | |
1313 | /* currently only one mesh-group can exist at a time */ | |
1314 | return PIM_MSDP_ERR_MAX_MESH_GROUPS; | |
1315 | } | |
1316 | ||
1317 | msdp->mg = pim_msdp_mg_new(mesh_group_name); | |
1318 | if (!msdp->mg) { | |
1319 | return PIM_MSDP_ERR_OOM; | |
1320 | } | |
1321 | ||
1322 | return PIM_MSDP_ERR_NONE; | |
1323 | } | |
1324 | ||
1325 | static int | |
1326 | pim_msdp_mg_mbr_comp(const void *p1, const void *p2) | |
1327 | { | |
1328 | const struct pim_msdp_mg_mbr *mbr1 = p1; | |
1329 | const struct pim_msdp_mg_mbr *mbr2 = p2; | |
1330 | ||
1331 | if (ntohl(mbr1->mbr_ip.s_addr) < ntohl(mbr2->mbr_ip.s_addr)) | |
1332 | return -1; | |
1333 | ||
1334 | if (ntohl(mbr1->mbr_ip.s_addr) > ntohl(mbr2->mbr_ip.s_addr)) | |
1335 | return 1; | |
1336 | ||
1337 | return 0; | |
1338 | } | |
1339 | ||
1340 | static void | |
1341 | pim_msdp_mg_mbr_free(struct pim_msdp_mg_mbr *mbr) | |
1342 | { | |
1343 | XFREE(MTYPE_PIM_MSDP_MG_MBR, mbr); | |
1344 | } | |
1345 | ||
1346 | static struct pim_msdp_mg_mbr * | |
1347 | pim_msdp_mg_mbr_find(struct in_addr mbr_ip) | |
1348 | { | |
1349 | struct pim_msdp_mg_mbr *mbr; | |
1350 | struct listnode *mbr_node; | |
1351 | ||
1352 | if (!msdp->mg) { | |
1353 | return NULL; | |
1354 | } | |
1355 | /* we can move this to a hash but considering that number of peers in | |
1356 | * a mesh-group that seems like bit of an overkill */ | |
1357 | for (ALL_LIST_ELEMENTS_RO(msdp->mg->mbr_list, mbr_node, mbr)) { | |
1358 | if (mbr->mbr_ip.s_addr == mbr_ip.s_addr) { | |
1359 | return mbr; | |
1360 | } | |
1361 | } | |
1362 | return mbr; | |
1363 | } | |
1364 | ||
1365 | enum pim_msdp_err | |
1366 | pim_msdp_mg_mbr_add(const char *mesh_group_name, struct in_addr mbr_ip) | |
1367 | { | |
1368 | int rc; | |
1369 | struct pim_msdp_mg_mbr *mbr; | |
1370 | struct pim_msdp_mg *mg; | |
1371 | ||
1372 | rc = pim_msdp_mg_add(mesh_group_name); | |
1373 | if (rc != PIM_MSDP_ERR_NONE) { | |
1374 | return rc; | |
1375 | } | |
1376 | ||
1377 | mg = msdp->mg; | |
1378 | mbr = pim_msdp_mg_mbr_find(mbr_ip); | |
1379 | if (mbr) { | |
1380 | return PIM_MSDP_ERR_MG_MBR_EXISTS; | |
1381 | } | |
1382 | ||
1383 | mbr = XCALLOC(MTYPE_PIM_MSDP_MG_MBR, sizeof(*mbr)); | |
1384 | if (!mbr) { | |
1385 | zlog_err("%s: PIM XCALLOC(%zu) failure", | |
1386 | __PRETTY_FUNCTION__, sizeof(*mbr)); | |
1387 | /* if there are no references to the mg free it */ | |
1388 | pim_msdp_mg_free(mg); | |
1389 | return PIM_MSDP_ERR_OOM; | |
1390 | } | |
1391 | mbr->mbr_ip = mbr_ip; | |
1392 | listnode_add_sort(mg->mbr_list, mbr); | |
1393 | ||
1394 | /* if valid SIP has been configured add peer session */ | |
1395 | if (mg->src_ip.s_addr != INADDR_ANY) { | |
1396 | pim_msdp_peer_add(mbr_ip, mg->src_ip, mesh_group_name, | |
1397 | &mbr->mp); | |
1398 | } | |
1399 | ||
1400 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1401 | char ip_str[INET_ADDRSTRLEN]; | |
1402 | pim_inet4_dump("<mbr?>", mbr->mbr_ip, ip_str, sizeof(ip_str)); | |
1403 | zlog_debug("MSDP mesh-group %s mbr %s created", mg->mesh_group_name, ip_str); | |
1404 | } | |
1405 | ++mg->mbr_cnt; | |
1406 | return PIM_MSDP_ERR_NONE; | |
1407 | } | |
1408 | ||
1409 | static void | |
1410 | pim_msdp_mg_mbr_do_del(struct pim_msdp_mg *mg, struct pim_msdp_mg_mbr *mbr) | |
1411 | { | |
1412 | /* Delete active peer session if any */ | |
1413 | if (mbr->mp) { | |
1414 | pim_msdp_peer_do_del(mbr->mp); | |
1415 | } | |
1416 | ||
1417 | listnode_delete(mg->mbr_list, mbr); | |
1418 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1419 | char ip_str[INET_ADDRSTRLEN]; | |
1420 | pim_inet4_dump("<mbr?>", mbr->mbr_ip, ip_str, sizeof(ip_str)); | |
1421 | zlog_debug("MSDP mesh-group %s mbr %s deleted", mg->mesh_group_name, ip_str); | |
1422 | } | |
1423 | pim_msdp_mg_mbr_free(mbr); | |
1424 | if (mg->mbr_cnt) { | |
1425 | --mg->mbr_cnt; | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | enum pim_msdp_err | |
1430 | pim_msdp_mg_mbr_del(const char *mesh_group_name, struct in_addr mbr_ip) | |
1431 | { | |
1432 | struct pim_msdp_mg_mbr *mbr; | |
1433 | struct pim_msdp_mg *mg = msdp->mg; | |
1434 | ||
1435 | if (!mg || strcmp(mg->mesh_group_name, mesh_group_name)) { | |
1436 | return PIM_MSDP_ERR_NO_MG; | |
1437 | } | |
1438 | ||
1439 | mbr = pim_msdp_mg_mbr_find(mbr_ip); | |
1440 | if (!mbr) { | |
1441 | return PIM_MSDP_ERR_NO_MG_MBR; | |
1442 | } | |
1443 | ||
1444 | pim_msdp_mg_mbr_do_del(mg, mbr); | |
1445 | /* if there are no references to the mg free it */ | |
1446 | pim_msdp_mg_free(mg); | |
1447 | ||
1448 | return PIM_MSDP_ERR_NONE; | |
1449 | } | |
1450 | ||
1451 | static void | |
1452 | pim_msdp_mg_src_do_del(void) | |
1453 | { | |
1454 | struct pim_msdp_mg_mbr *mbr; | |
1455 | struct listnode *mbr_node; | |
1456 | struct pim_msdp_mg *mg = msdp->mg; | |
1457 | ||
1458 | /* SIP is being removed - tear down all active peer sessions */ | |
1459 | for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbr_node, mbr)) { | |
1460 | if (mbr->mp) { | |
1461 | pim_msdp_peer_do_del(mbr->mp); | |
1462 | mbr->mp = NULL; | |
1463 | } | |
1464 | } | |
1465 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1466 | zlog_debug("MSDP mesh-group %s src cleared", mg->mesh_group_name); | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | enum pim_msdp_err | |
1471 | pim_msdp_mg_src_del(const char *mesh_group_name) | |
1472 | { | |
1473 | struct pim_msdp_mg *mg = msdp->mg; | |
1474 | ||
1475 | if (!mg || strcmp(mg->mesh_group_name, mesh_group_name)) { | |
1476 | return PIM_MSDP_ERR_NO_MG; | |
1477 | } | |
1478 | ||
1479 | if (mg->src_ip.s_addr != INADDR_ANY) { | |
1480 | mg->src_ip.s_addr = INADDR_ANY; | |
1481 | pim_msdp_mg_src_do_del(); | |
1482 | /* if there are no references to the mg free it */ | |
1483 | pim_msdp_mg_free(mg); | |
1484 | } | |
1485 | return PIM_MSDP_ERR_NONE; | |
1486 | } | |
1487 | ||
1488 | enum pim_msdp_err | |
1489 | pim_msdp_mg_src_add(const char *mesh_group_name, struct in_addr src_ip) | |
1490 | { | |
1491 | int rc; | |
1492 | struct pim_msdp_mg_mbr *mbr; | |
1493 | struct listnode *mbr_node; | |
1494 | struct pim_msdp_mg *mg; | |
1495 | ||
1496 | if (src_ip.s_addr == INADDR_ANY) { | |
1497 | pim_msdp_mg_src_del(mesh_group_name); | |
1498 | return PIM_MSDP_ERR_NONE; | |
1499 | } | |
1500 | ||
1501 | rc = pim_msdp_mg_add(mesh_group_name); | |
1502 | if (rc != PIM_MSDP_ERR_NONE) { | |
1503 | return rc; | |
1504 | } | |
1505 | ||
1506 | mg = msdp->mg; | |
1507 | if (mg->src_ip.s_addr != INADDR_ANY) { | |
1508 | pim_msdp_mg_src_do_del(); | |
1509 | } | |
1510 | mg->src_ip = src_ip; | |
1511 | ||
1512 | for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbr_node, mbr)) { | |
1513 | pim_msdp_peer_add(mbr->mbr_ip, mg->src_ip, mesh_group_name, | |
1514 | &mbr->mp); | |
1515 | } | |
1516 | ||
1517 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1518 | char ip_str[INET_ADDRSTRLEN]; | |
1519 | pim_inet4_dump("<src?>", mg->src_ip, ip_str, sizeof(ip_str)); | |
1520 | zlog_debug("MSDP mesh-group %s src %s set", mg->mesh_group_name, ip_str); | |
1521 | } | |
1522 | return PIM_MSDP_ERR_NONE; | |
1523 | } | |
1524 | ||
3c72d654 | 1525 | /*********************** MSDP feature APIs *********************************/ |
1526 | int | |
1527 | pim_msdp_config_write(struct vty *vty) | |
1528 | { | |
977d71cc | 1529 | struct listnode *mbrnode; |
1530 | struct pim_msdp_mg_mbr *mbr; | |
1531 | struct pim_msdp_mg *mg = msdp->mg; | |
1532 | char mbr_str[INET_ADDRSTRLEN]; | |
1533 | char src_str[INET_ADDRSTRLEN]; | |
3c72d654 | 1534 | int count = 0; |
1535 | ||
977d71cc | 1536 | if (!mg) { |
1537 | return count; | |
1538 | } | |
1539 | ||
1540 | if (mg->src_ip.s_addr != INADDR_ANY) { | |
1541 | pim_inet4_dump("<src?>", mg->src_ip, src_str, sizeof(src_str)); | |
1542 | vty_out(vty, "ip msdp mesh-group %s source %s%s", | |
1543 | mg->mesh_group_name, src_str, VTY_NEWLINE); | |
1544 | ++count; | |
1545 | } | |
1546 | ||
1547 | for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbrnode, mbr)) { | |
1548 | pim_inet4_dump("<mbr?>", mbr->mbr_ip, mbr_str, sizeof(mbr_str)); | |
1549 | vty_out(vty, "ip msdp mesh-group %s member %s%s", | |
1550 | mg->mesh_group_name, mbr_str, VTY_NEWLINE); | |
3c72d654 | 1551 | ++count; |
1552 | } | |
1553 | return count; | |
1554 | } | |
1555 | ||
1556 | /* Enable feature including active/periodic timers etc. on the first peer | |
1557 | * config. Till then MSDP should just stay quiet. */ | |
1558 | static void | |
1559 | pim_msdp_enable(void) | |
1560 | { | |
1561 | if (msdp->flags & PIM_MSDPF_ENABLE) { | |
1562 | /* feature is already enabled */ | |
1563 | return; | |
1564 | } | |
1565 | msdp->flags |= PIM_MSDPF_ENABLE; | |
1566 | msdp->work_obuf = stream_new(PIM_MSDP_MAX_PACKET_SIZE); | |
1567 | pim_msdp_sa_adv_timer_setup(true /* start */); | |
1568 | /* setup sa cache based on local sources */ | |
1569 | pim_msdp_sa_local_setup(); | |
1570 | } | |
1571 | ||
2a333e0f | 1572 | /* MSDP init */ |
1573 | void | |
1574 | pim_msdp_init(struct thread_master *master) | |
1575 | { | |
3c72d654 | 1576 | msdp->master = master; |
1577 | ||
2a333e0f | 1578 | msdp->peer_hash = hash_create(pim_msdp_peer_hash_key_make, |
1579 | pim_msdp_peer_hash_eq); | |
1580 | msdp->peer_list = list_new(); | |
1581 | msdp->peer_list->del = (void (*)(void *))pim_msdp_peer_free; | |
1582 | msdp->peer_list->cmp = (int (*)(void *, void *))pim_msdp_peer_comp; | |
3c72d654 | 1583 | |
1584 | msdp->sa_hash = hash_create(pim_msdp_sa_hash_key_make, | |
1585 | pim_msdp_sa_hash_eq); | |
1586 | msdp->sa_list = list_new(); | |
1587 | msdp->sa_list->del = (void (*)(void *))pim_msdp_sa_free; | |
1588 | msdp->sa_list->cmp = (int (*)(void *, void *))pim_msdp_sa_comp; | |
2a333e0f | 1589 | } |
1590 | ||
1591 | /* counterpart to MSDP init; XXX: unused currently */ | |
1592 | void | |
1593 | pim_msdp_exit(void) | |
1594 | { | |
1595 | /* XXX: stop listener and delete all peer sessions */ | |
1596 | ||
1597 | if (msdp->peer_hash) { | |
1598 | hash_free(msdp->peer_hash); | |
1599 | msdp->peer_hash = NULL; | |
1600 | } | |
1601 | ||
1602 | if (msdp->peer_list) { | |
1603 | list_free(msdp->peer_list); | |
1604 | msdp->peer_list = NULL; | |
1605 | } | |
11128587 | 1606 | } |