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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 | * | |
896014f4 DL |
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 | |
11128587 DS |
18 | */ |
19 | ||
20 | #include <zebra.h> | |
21 | ||
2a333e0f | 22 | #include <lib/hash.h> |
23 | #include <lib/jhash.h> | |
24 | #include <lib/log.h> | |
3c72d654 | 25 | #include <lib/prefix.h> |
2a333e0f | 26 | #include <lib/sockunion.h> |
27 | #include <lib/stream.h> | |
28 | #include <lib/thread.h> | |
3c72d654 | 29 | #include <lib/vty.h> |
30 | #include <lib/plist.h> | |
3613d898 | 31 | #include <lib/lib_errors.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" |
472ad383 | 41 | #include "pim_oil.h" |
11128587 | 42 | |
2a333e0f | 43 | #include "pim_msdp.h" |
44 | #include "pim_msdp_packet.h" | |
45 | #include "pim_msdp_socket.h" | |
46 | ||
2ad78035 | 47 | // struct pim_msdp pim_msdp, *msdp = &pim_msdp; |
2a333e0f | 48 | |
49 | static void pim_msdp_peer_listen(struct pim_msdp_peer *mp); | |
50 | static void pim_msdp_peer_cr_timer_setup(struct pim_msdp_peer *mp, bool start); | |
51 | static void pim_msdp_peer_ka_timer_setup(struct pim_msdp_peer *mp, bool start); | |
d62a17ae | 52 | static void pim_msdp_peer_hold_timer_setup(struct pim_msdp_peer *mp, |
53 | bool start); | |
2a333e0f | 54 | static void pim_msdp_peer_free(struct pim_msdp_peer *mp); |
472ad383 DS |
55 | static void pim_msdp_enable(struct pim_instance *pim); |
56 | static void pim_msdp_sa_adv_timer_setup(struct pim_instance *pim, bool start); | |
d62a17ae | 57 | static void pim_msdp_sa_deref(struct pim_msdp_sa *sa, |
58 | enum pim_msdp_sa_flags flags); | |
977d71cc | 59 | static int pim_msdp_mg_mbr_comp(const void *p1, const void *p2); |
60 | static void pim_msdp_mg_mbr_free(struct pim_msdp_mg_mbr *mbr); | |
d62a17ae | 61 | static void pim_msdp_mg_mbr_do_del(struct pim_msdp_mg *mg, |
62 | struct pim_msdp_mg_mbr *mbr); | |
2a333e0f | 63 | |
3c72d654 | 64 | /************************ SA cache management ******************************/ |
d62a17ae | 65 | static void pim_msdp_sa_timer_expiry_log(struct pim_msdp_sa *sa, |
66 | const char *timer_str) | |
3c72d654 | 67 | { |
d62a17ae | 68 | zlog_debug("MSDP SA %s %s timer expired", sa->sg_str, timer_str); |
3c72d654 | 69 | } |
70 | ||
71 | /* RFC-3618:Sec-5.1 - global active source advertisement timer */ | |
d62a17ae | 72 | static int pim_msdp_sa_adv_timer_cb(struct thread *t) |
3c72d654 | 73 | { |
472ad383 DS |
74 | struct pim_instance *pim = THREAD_ARG(t); |
75 | ||
d62a17ae | 76 | if (PIM_DEBUG_MSDP_EVENTS) { |
0437e105 | 77 | zlog_debug("MSDP SA advertisement timer expired"); |
d62a17ae | 78 | } |
3c72d654 | 79 | |
472ad383 DS |
80 | pim_msdp_sa_adv_timer_setup(pim, true /* start */); |
81 | pim_msdp_pkt_sa_tx(pim); | |
d62a17ae | 82 | return 0; |
3c72d654 | 83 | } |
472ad383 | 84 | static void pim_msdp_sa_adv_timer_setup(struct pim_instance *pim, bool start) |
3c72d654 | 85 | { |
472ad383 | 86 | THREAD_OFF(pim->msdp.sa_adv_timer); |
d62a17ae | 87 | if (start) { |
472ad383 DS |
88 | thread_add_timer(pim->msdp.master, pim_msdp_sa_adv_timer_cb, |
89 | pim, PIM_MSDP_SA_ADVERTISMENT_TIME, | |
90 | &pim->msdp.sa_adv_timer); | |
d62a17ae | 91 | } |
3c72d654 | 92 | } |
93 | ||
94 | /* RFC-3618:Sec-5.3 - SA cache state timer */ | |
d62a17ae | 95 | static int pim_msdp_sa_state_timer_cb(struct thread *t) |
3c72d654 | 96 | { |
d62a17ae | 97 | struct pim_msdp_sa *sa; |
3c72d654 | 98 | |
d62a17ae | 99 | sa = THREAD_ARG(t); |
3c72d654 | 100 | |
d62a17ae | 101 | if (PIM_DEBUG_MSDP_EVENTS) { |
102 | pim_msdp_sa_timer_expiry_log(sa, "state"); | |
103 | } | |
3c72d654 | 104 | |
d62a17ae | 105 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_PEER); |
106 | return 0; | |
3c72d654 | 107 | } |
d62a17ae | 108 | static void pim_msdp_sa_state_timer_setup(struct pim_msdp_sa *sa, bool start) |
3c72d654 | 109 | { |
d62a17ae | 110 | THREAD_OFF(sa->sa_state_timer); |
111 | if (start) { | |
472ad383 DS |
112 | thread_add_timer(sa->pim->msdp.master, |
113 | pim_msdp_sa_state_timer_cb, sa, | |
114 | PIM_MSDP_SA_HOLD_TIME, &sa->sa_state_timer); | |
d62a17ae | 115 | } |
3c72d654 | 116 | } |
117 | ||
d62a17ae | 118 | static void pim_msdp_sa_upstream_del(struct pim_msdp_sa *sa) |
7667c556 | 119 | { |
d62a17ae | 120 | struct pim_upstream *up = sa->up; |
121 | if (!up) { | |
122 | return; | |
123 | } | |
7667c556 | 124 | |
d62a17ae | 125 | sa->up = NULL; |
126 | if (PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(up->flags)) { | |
127 | PIM_UPSTREAM_FLAG_UNSET_SRC_MSDP(up->flags); | |
128 | sa->flags |= PIM_MSDP_SAF_UP_DEL_IN_PROG; | |
41a115e4 AK |
129 | up = pim_upstream_del(sa->pim, up, __PRETTY_FUNCTION__); |
130 | /* re-eval joinDesired; clearing peer-msdp-sa flag can | |
131 | * cause JD to change | |
132 | */ | |
133 | if (up) | |
134 | pim_upstream_update_join_desired(sa->pim, up); | |
d62a17ae | 135 | sa->flags &= ~PIM_MSDP_SAF_UP_DEL_IN_PROG; |
136 | } | |
7667c556 | 137 | |
d62a17ae | 138 | if (PIM_DEBUG_MSDP_EVENTS) { |
139 | zlog_debug("MSDP SA %s de-referenced SPT", sa->sg_str); | |
140 | } | |
7667c556 | 141 | } |
142 | ||
d62a17ae | 143 | static bool pim_msdp_sa_upstream_add_ok(struct pim_msdp_sa *sa, |
144 | struct pim_upstream *xg_up) | |
7667c556 | 145 | { |
d62a17ae | 146 | if (!(sa->flags & PIM_MSDP_SAF_PEER)) { |
147 | /* SA should have been rxed from a peer */ | |
148 | return false; | |
149 | } | |
150 | /* check if we are RP */ | |
472ad383 | 151 | if (!I_am_RP(sa->pim, sa->sg.grp)) { |
d62a17ae | 152 | return false; |
153 | } | |
7667c556 | 154 | |
d62a17ae | 155 | /* check if we have a (*, G) with a non-empty immediate OIL */ |
156 | if (!xg_up) { | |
157 | struct prefix_sg sg; | |
7667c556 | 158 | |
d62a17ae | 159 | memset(&sg, 0, sizeof(sg)); |
160 | sg.grp = sa->sg.grp; | |
7667c556 | 161 | |
472ad383 | 162 | xg_up = pim_upstream_find(sa->pim, &sg); |
d62a17ae | 163 | } |
164 | if (!xg_up || (xg_up->join_state != PIM_UPSTREAM_JOINED)) { | |
165 | /* join desired will be true for such (*, G) entries so we will | |
166 | * just look at join_state and let the PIM state machine do the | |
167 | * rest of | |
168 | * the magic */ | |
169 | return false; | |
170 | } | |
7667c556 | 171 | |
d62a17ae | 172 | return true; |
7667c556 | 173 | } |
174 | ||
175 | /* Upstream add evaluation needs to happen everytime - | |
176 | * 1. Peer reference is added or removed. | |
1bf16443 | 177 | * 2. The RP for a group changes. |
178 | * 3. joinDesired for the associated (*, G) changes | |
179 | * 4. associated (*, G) is removed - this seems like a bit redundant | |
7667c556 | 180 | * (considering #4); but just in case an entry gets nuked without |
181 | * upstream state transition | |
182 | * */ | |
d62a17ae | 183 | static void pim_msdp_sa_upstream_update(struct pim_msdp_sa *sa, |
184 | struct pim_upstream *xg_up, | |
185 | const char *ctx) | |
186 | { | |
187 | struct pim_upstream *up; | |
188 | ||
189 | if (!pim_msdp_sa_upstream_add_ok(sa, xg_up)) { | |
190 | pim_msdp_sa_upstream_del(sa); | |
191 | return; | |
192 | } | |
193 | ||
194 | if (sa->up) { | |
195 | /* nothing to do */ | |
196 | return; | |
197 | } | |
198 | ||
472ad383 | 199 | up = pim_upstream_find(sa->pim, &sa->sg); |
d62a17ae | 200 | if (up && (PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(up->flags))) { |
201 | /* somehow we lost track of the upstream ptr? best log it */ | |
202 | sa->up = up; | |
203 | if (PIM_DEBUG_MSDP_EVENTS) { | |
204 | zlog_debug("MSDP SA %s SPT reference missing", | |
205 | sa->sg_str); | |
206 | } | |
207 | return; | |
208 | } | |
209 | ||
210 | /* RFC3618: "RP triggers a (S, G) join event towards the data source | |
211 | * as if a JP message was rxed addressed to the RP itself." */ | |
2002dcdb | 212 | up = pim_upstream_add(sa->pim, &sa->sg, NULL /* iif */, |
d62a17ae | 213 | PIM_UPSTREAM_FLAG_MASK_SRC_MSDP, |
0885a9f1 | 214 | __PRETTY_FUNCTION__, NULL); |
d62a17ae | 215 | |
216 | sa->up = up; | |
217 | if (up) { | |
218 | /* update inherited oil */ | |
472ad383 | 219 | pim_upstream_inherited_olist(sa->pim, up); |
d62a17ae | 220 | /* should we also start the kat in parallel? we will need it |
221 | * when the | |
222 | * SA ages out */ | |
223 | if (PIM_DEBUG_MSDP_EVENTS) { | |
224 | zlog_debug("MSDP SA %s referenced SPT", sa->sg_str); | |
225 | } | |
226 | } else { | |
227 | if (PIM_DEBUG_MSDP_EVENTS) { | |
228 | zlog_debug("MSDP SA %s SPT reference failed", | |
229 | sa->sg_str); | |
230 | } | |
231 | } | |
7667c556 | 232 | } |
233 | ||
3c72d654 | 234 | /* release all mem associated with a sa */ |
d62a17ae | 235 | static void pim_msdp_sa_free(struct pim_msdp_sa *sa) |
3c72d654 | 236 | { |
ec2f0e53 DS |
237 | pim_msdp_sa_state_timer_setup(sa, false); |
238 | ||
d62a17ae | 239 | XFREE(MTYPE_PIM_MSDP_SA, sa); |
3c72d654 | 240 | } |
241 | ||
472ad383 DS |
242 | static struct pim_msdp_sa *pim_msdp_sa_new(struct pim_instance *pim, |
243 | struct prefix_sg *sg, | |
d62a17ae | 244 | struct in_addr rp) |
3c72d654 | 245 | { |
d62a17ae | 246 | struct pim_msdp_sa *sa; |
3c72d654 | 247 | |
d62a17ae | 248 | sa = XCALLOC(MTYPE_PIM_MSDP_SA, sizeof(*sa)); |
3c72d654 | 249 | |
472ad383 | 250 | sa->pim = pim; |
d62a17ae | 251 | sa->sg = *sg; |
252 | pim_str_sg_set(sg, sa->sg_str); | |
253 | sa->rp = rp; | |
254 | sa->uptime = pim_time_monotonic_sec(); | |
3c72d654 | 255 | |
d62a17ae | 256 | /* insert into misc tables for easy access */ |
472ad383 | 257 | sa = hash_get(pim->msdp.sa_hash, sa, hash_alloc_intern); |
472ad383 | 258 | listnode_add_sort(pim->msdp.sa_list, sa); |
3c72d654 | 259 | |
d62a17ae | 260 | if (PIM_DEBUG_MSDP_EVENTS) { |
261 | zlog_debug("MSDP SA %s created", sa->sg_str); | |
262 | } | |
3c72d654 | 263 | |
d62a17ae | 264 | return sa; |
3c72d654 | 265 | } |
266 | ||
472ad383 DS |
267 | static struct pim_msdp_sa *pim_msdp_sa_find(struct pim_instance *pim, |
268 | struct prefix_sg *sg) | |
3c72d654 | 269 | { |
d62a17ae | 270 | struct pim_msdp_sa lookup; |
3c72d654 | 271 | |
d62a17ae | 272 | lookup.sg = *sg; |
472ad383 | 273 | return hash_lookup(pim->msdp.sa_hash, &lookup); |
3c72d654 | 274 | } |
275 | ||
472ad383 DS |
276 | static struct pim_msdp_sa *pim_msdp_sa_add(struct pim_instance *pim, |
277 | struct prefix_sg *sg, | |
d62a17ae | 278 | struct in_addr rp) |
3c72d654 | 279 | { |
d62a17ae | 280 | struct pim_msdp_sa *sa; |
3c72d654 | 281 | |
472ad383 | 282 | sa = pim_msdp_sa_find(pim, sg); |
d62a17ae | 283 | if (sa) { |
284 | return sa; | |
285 | } | |
3c72d654 | 286 | |
472ad383 | 287 | return pim_msdp_sa_new(pim, sg, rp); |
3c72d654 | 288 | } |
289 | ||
d62a17ae | 290 | static void pim_msdp_sa_del(struct pim_msdp_sa *sa) |
3c72d654 | 291 | { |
d62a17ae | 292 | /* this is somewhat redundant - still want to be careful not to leave |
293 | * stale upstream references */ | |
294 | pim_msdp_sa_upstream_del(sa); | |
7667c556 | 295 | |
d62a17ae | 296 | /* stop timers */ |
297 | pim_msdp_sa_state_timer_setup(sa, false /* start */); | |
3c72d654 | 298 | |
d62a17ae | 299 | /* remove the entry from various tables */ |
472ad383 DS |
300 | listnode_delete(sa->pim->msdp.sa_list, sa); |
301 | hash_release(sa->pim->msdp.sa_hash, sa); | |
3c72d654 | 302 | |
d62a17ae | 303 | if (PIM_DEBUG_MSDP_EVENTS) { |
304 | zlog_debug("MSDP SA %s deleted", sa->sg_str); | |
305 | } | |
3c72d654 | 306 | |
d62a17ae | 307 | /* free up any associated memory */ |
308 | pim_msdp_sa_free(sa); | |
3c72d654 | 309 | } |
310 | ||
d62a17ae | 311 | static void pim_msdp_sa_peer_ip_set(struct pim_msdp_sa *sa, |
312 | struct pim_msdp_peer *mp, struct in_addr rp) | |
15ad0c71 | 313 | { |
d62a17ae | 314 | struct pim_msdp_peer *old_mp; |
15ad0c71 | 315 | |
d62a17ae | 316 | /* optimize the "no change" case as it will happen |
317 | * frequently/periodically */ | |
318 | if (mp && (sa->peer.s_addr == mp->peer.s_addr)) { | |
319 | return; | |
320 | } | |
15ad0c71 | 321 | |
d62a17ae | 322 | /* any time the peer ip changes also update the rp address */ |
323 | if (PIM_INADDR_ISNOT_ANY(sa->peer)) { | |
472ad383 | 324 | old_mp = pim_msdp_peer_find(sa->pim, sa->peer); |
d62a17ae | 325 | if (old_mp && old_mp->sa_cnt) { |
326 | --old_mp->sa_cnt; | |
327 | } | |
328 | } | |
15ad0c71 | 329 | |
d62a17ae | 330 | if (mp) { |
331 | ++mp->sa_cnt; | |
332 | sa->peer = mp->peer; | |
333 | } else { | |
334 | sa->peer.s_addr = PIM_NET_INADDR_ANY; | |
335 | } | |
336 | sa->rp = rp; | |
15ad0c71 | 337 | } |
338 | ||
3c72d654 | 339 | /* When a local active-source is removed there is no way to withdraw the |
340 | * source from peers. We will simply remove it from the SA cache so it will | |
341 | * not be sent in supsequent SA updates. Peers will consequently timeout the | |
342 | * SA. | |
343 | * Similarly a "peer-added" SA is never explicitly deleted. It is simply | |
d62a17ae | 344 | * aged out overtime if not seen in the SA updates from the peers. |
3c72d654 | 345 | * XXX: should we provide a knob to drop entries learnt from a peer when the |
346 | * peer goes down? */ | |
d62a17ae | 347 | static void pim_msdp_sa_deref(struct pim_msdp_sa *sa, |
348 | enum pim_msdp_sa_flags flags) | |
349 | { | |
350 | bool update_up = false; | |
351 | ||
352 | if ((sa->flags & PIM_MSDP_SAF_LOCAL)) { | |
353 | if (flags & PIM_MSDP_SAF_LOCAL) { | |
354 | if (PIM_DEBUG_MSDP_EVENTS) { | |
355 | zlog_debug("MSDP SA %s local reference removed", | |
356 | sa->sg_str); | |
357 | } | |
472ad383 DS |
358 | if (sa->pim->msdp.local_cnt) |
359 | --sa->pim->msdp.local_cnt; | |
d62a17ae | 360 | } |
361 | } | |
362 | ||
363 | if ((sa->flags & PIM_MSDP_SAF_PEER)) { | |
364 | if (flags & PIM_MSDP_SAF_PEER) { | |
365 | struct in_addr rp; | |
366 | ||
367 | if (PIM_DEBUG_MSDP_EVENTS) { | |
368 | zlog_debug("MSDP SA %s peer reference removed", | |
369 | sa->sg_str); | |
370 | } | |
371 | pim_msdp_sa_state_timer_setup(sa, false /* start */); | |
372 | rp.s_addr = INADDR_ANY; | |
373 | pim_msdp_sa_peer_ip_set(sa, NULL /* mp */, rp); | |
374 | /* if peer ref was removed we need to remove the msdp | |
375 | * reference on the | |
376 | * msdp entry */ | |
377 | update_up = true; | |
378 | } | |
379 | } | |
380 | ||
381 | sa->flags &= ~flags; | |
382 | if (update_up) { | |
383 | pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, "sa-deref"); | |
384 | } | |
385 | ||
386 | if (!(sa->flags & PIM_MSDP_SAF_REF)) { | |
387 | pim_msdp_sa_del(sa); | |
388 | } | |
389 | } | |
390 | ||
472ad383 DS |
391 | void pim_msdp_sa_ref(struct pim_instance *pim, struct pim_msdp_peer *mp, |
392 | struct prefix_sg *sg, struct in_addr rp) | |
d62a17ae | 393 | { |
394 | struct pim_msdp_sa *sa; | |
395 | ||
472ad383 | 396 | sa = pim_msdp_sa_add(pim, sg, rp); |
d62a17ae | 397 | if (!sa) { |
398 | return; | |
399 | } | |
400 | ||
401 | /* reference it */ | |
402 | if (mp) { | |
403 | if (!(sa->flags & PIM_MSDP_SAF_PEER)) { | |
404 | sa->flags |= PIM_MSDP_SAF_PEER; | |
405 | if (PIM_DEBUG_MSDP_EVENTS) { | |
406 | zlog_debug("MSDP SA %s added by peer", | |
407 | sa->sg_str); | |
408 | } | |
409 | } | |
410 | pim_msdp_sa_peer_ip_set(sa, mp, rp); | |
411 | /* start/re-start the state timer to prevent cache expiry */ | |
412 | pim_msdp_sa_state_timer_setup(sa, true /* start */); | |
413 | /* We re-evaluate SA "SPT-trigger" everytime we hear abt it from | |
414 | * a | |
415 | * peer. XXX: If this becomes too much of a periodic overhead we | |
416 | * can make it event based */ | |
417 | pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, "peer-ref"); | |
418 | } else { | |
419 | if (!(sa->flags & PIM_MSDP_SAF_LOCAL)) { | |
420 | sa->flags |= PIM_MSDP_SAF_LOCAL; | |
472ad383 | 421 | ++sa->pim->msdp.local_cnt; |
d62a17ae | 422 | if (PIM_DEBUG_MSDP_EVENTS) { |
423 | zlog_debug("MSDP SA %s added locally", | |
424 | sa->sg_str); | |
425 | } | |
426 | /* send an immediate SA update to peers */ | |
427 | pim_msdp_pkt_sa_tx_one(sa); | |
428 | } | |
429 | sa->flags &= ~PIM_MSDP_SAF_STALE; | |
430 | } | |
3c72d654 | 431 | } |
432 | ||
1bf16443 | 433 | /* The following criteria must be met to originate an SA from the MSDP |
434 | * speaker - | |
435 | * 1. KAT must be running i.e. source is active. | |
436 | * 2. We must be RP for the group. | |
437 | * 3. Source must be registrable to the RP (this is where the RFC is vague | |
438 | * and especially ambiguous in CLOS networks; with anycast RP all sources | |
439 | * are potentially registrable to all RPs in the domain). We assume #3 is | |
440 | * satisfied if - | |
441 | * a. We are also the FHR-DR for the source (OR) | |
442 | * b. We rxed a pim register (null or data encapsulated) within the last | |
443 | * (3 * (1.5 * register_suppression_timer))). | |
444 | */ | |
d62a17ae | 445 | static bool pim_msdp_sa_local_add_ok(struct pim_upstream *up) |
3c72d654 | 446 | { |
472ad383 DS |
447 | struct pim_instance *pim = up->channel_oil->pim; |
448 | ||
449 | if (!(pim->msdp.flags & PIM_MSDPF_ENABLE)) { | |
d62a17ae | 450 | return false; |
451 | } | |
3c72d654 | 452 | |
ec836533 | 453 | if (!pim_upstream_is_kat_running(up)) |
d62a17ae | 454 | /* stream is not active */ |
455 | return false; | |
1bf16443 | 456 | |
472ad383 | 457 | if (!I_am_RP(pim, up->sg.grp)) { |
d62a17ae | 458 | /* we are not RP for the group */ |
459 | return false; | |
460 | } | |
1bf16443 | 461 | |
d62a17ae | 462 | /* we are the FHR-DR for this stream or we are RP and have seen |
463 | * registers | |
464 | * from a FHR for this source */ | |
465 | if (PIM_UPSTREAM_FLAG_TEST_FHR(up->flags) || up->t_msdp_reg_timer) { | |
466 | return true; | |
467 | } | |
1bf16443 | 468 | |
d62a17ae | 469 | return false; |
1bf16443 | 470 | } |
471 | ||
472ad383 DS |
472 | static void pim_msdp_sa_local_add(struct pim_instance *pim, |
473 | struct prefix_sg *sg) | |
1bf16443 | 474 | { |
d62a17ae | 475 | struct in_addr rp; |
975a328e | 476 | rp.s_addr = INADDR_ANY; |
472ad383 | 477 | pim_msdp_sa_ref(pim, NULL /* mp */, sg, rp); |
3c72d654 | 478 | } |
479 | ||
472ad383 | 480 | void pim_msdp_sa_local_del(struct pim_instance *pim, struct prefix_sg *sg) |
3c72d654 | 481 | { |
d62a17ae | 482 | struct pim_msdp_sa *sa; |
3c72d654 | 483 | |
472ad383 | 484 | sa = pim_msdp_sa_find(pim, sg); |
d62a17ae | 485 | if (sa) { |
486 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); | |
487 | } | |
3c72d654 | 488 | } |
489 | ||
36e466fe | 490 | /* we need to be very cautious with this API as SA del too can trigger an |
491 | * upstream del and we will get stuck in a simple loop */ | |
472ad383 DS |
492 | static void pim_msdp_sa_local_del_on_up_del(struct pim_instance *pim, |
493 | struct prefix_sg *sg) | |
d62a17ae | 494 | { |
495 | struct pim_msdp_sa *sa; | |
496 | ||
472ad383 | 497 | sa = pim_msdp_sa_find(pim, sg); |
d62a17ae | 498 | if (sa) { |
499 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
500 | zlog_debug("MSDP local sa %s del on up del", | |
501 | sa->sg_str); | |
502 | } | |
503 | ||
504 | /* if there is no local reference escape */ | |
505 | if (!(sa->flags & PIM_MSDP_SAF_LOCAL)) { | |
506 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
507 | zlog_debug("MSDP local sa %s del; no local ref", | |
508 | sa->sg_str); | |
509 | } | |
510 | return; | |
511 | } | |
512 | ||
513 | if (sa->flags & PIM_MSDP_SAF_UP_DEL_IN_PROG) { | |
514 | /* MSDP is the one that triggered the upstream del. if | |
515 | * this happens | |
516 | * we most certainly have a bug in the PIM upstream | |
517 | * state machine. We | |
518 | * will not have a local reference unless the KAT is | |
519 | * running. And if the | |
520 | * KAT is running there MUST be an additional | |
521 | * source-stream reference to | |
522 | * the flow. Accounting for such cases requires lot of | |
523 | * changes; perhaps | |
524 | * address this in the next release? - XXX */ | |
af4c2728 | 525 | flog_err( |
1c50c1c0 | 526 | EC_LIB_DEVELOPMENT, |
d62a17ae | 527 | "MSDP sa %s SPT teardown is causing the local entry to be removed", |
528 | sa->sg_str); | |
529 | return; | |
530 | } | |
531 | ||
532 | /* we are dropping the sa on upstream del we should not have an | |
533 | * upstream reference */ | |
534 | if (sa->up) { | |
535 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
536 | zlog_debug("MSDP local sa %s del; up non-NULL", | |
537 | sa->sg_str); | |
538 | } | |
539 | sa->up = NULL; | |
540 | } | |
541 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); | |
542 | } | |
36e466fe | 543 | } |
544 | ||
1bf16443 | 545 | /* Local SA qualification needs to be re-evaluated when - |
546 | * 1. KAT is started or stopped | |
547 | * 2. on RP changes | |
548 | * 3. Whenever FHR status changes for a (S,G) - XXX - currently there | |
549 | * is no clear path to transition an entry out of "MASK_FHR" need | |
550 | * to discuss this with Donald. May result in some strangeness if the | |
551 | * FHR is also the RP. | |
552 | * 4. When msdp_reg timer is started or stopped | |
553 | */ | |
d62a17ae | 554 | void pim_msdp_sa_local_update(struct pim_upstream *up) |
1bf16443 | 555 | { |
472ad383 DS |
556 | struct pim_instance *pim = up->channel_oil->pim; |
557 | ||
d62a17ae | 558 | if (pim_msdp_sa_local_add_ok(up)) { |
472ad383 | 559 | pim_msdp_sa_local_add(pim, &up->sg); |
d62a17ae | 560 | } else { |
472ad383 | 561 | pim_msdp_sa_local_del(pim, &up->sg); |
d62a17ae | 562 | } |
1bf16443 | 563 | } |
564 | ||
472ad383 | 565 | static void pim_msdp_sa_local_setup(struct pim_instance *pim) |
3c72d654 | 566 | { |
d62a17ae | 567 | struct pim_upstream *up; |
3c72d654 | 568 | |
dd3364cb | 569 | frr_each (rb_pim_upstream, &pim->upstream_head, up) |
d62a17ae | 570 | pim_msdp_sa_local_update(up); |
3c72d654 | 571 | } |
572 | ||
7667c556 | 573 | /* whenever the RP changes we need to re-evaluate the "local" SA-cache */ |
574 | /* XXX: needs to be tested */ | |
472ad383 | 575 | void pim_msdp_i_am_rp_changed(struct pim_instance *pim) |
d62a17ae | 576 | { |
577 | struct listnode *sanode; | |
578 | struct listnode *nextnode; | |
579 | struct pim_msdp_sa *sa; | |
580 | ||
472ad383 | 581 | if (!(pim->msdp.flags & PIM_MSDPF_ENABLE)) { |
d62a17ae | 582 | /* if the feature is not enabled do nothing */ |
583 | return; | |
584 | } | |
585 | ||
586 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
587 | zlog_debug("MSDP i_am_rp changed"); | |
588 | } | |
589 | ||
590 | /* mark all local entries as stale */ | |
472ad383 | 591 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { |
d62a17ae | 592 | if (sa->flags & PIM_MSDP_SAF_LOCAL) { |
593 | sa->flags |= PIM_MSDP_SAF_STALE; | |
594 | } | |
595 | } | |
596 | ||
597 | /* re-setup local SA entries */ | |
472ad383 | 598 | pim_msdp_sa_local_setup(pim); |
d62a17ae | 599 | |
472ad383 | 600 | for (ALL_LIST_ELEMENTS(pim->msdp.sa_list, sanode, nextnode, sa)) { |
d62a17ae | 601 | /* purge stale SA entries */ |
602 | if (sa->flags & PIM_MSDP_SAF_STALE) { | |
603 | /* clear the stale flag; the entry may be kept even | |
604 | * after | |
605 | * "local-deref" */ | |
606 | sa->flags &= ~PIM_MSDP_SAF_STALE; | |
607 | /* sa_deref can end up freeing the sa; so don't access | |
608 | * contents after */ | |
609 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); | |
610 | } else { | |
611 | /* if the souce is still active check if we can | |
612 | * influence SPT */ | |
613 | pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, | |
614 | "rp-change"); | |
615 | } | |
616 | } | |
7667c556 | 617 | } |
618 | ||
619 | /* We track the join state of (*, G) entries. If G has sources in the SA-cache | |
620 | * we need to setup or teardown SPT when the JoinDesired status changes for | |
621 | * (*, G) */ | |
1eca8576 DS |
622 | void pim_msdp_up_join_state_changed(struct pim_instance *pim, |
623 | struct pim_upstream *xg_up) | |
d62a17ae | 624 | { |
625 | struct listnode *sanode; | |
626 | struct pim_msdp_sa *sa; | |
627 | ||
628 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
629 | zlog_debug("MSDP join state changed for %s", xg_up->sg_str); | |
630 | } | |
631 | ||
632 | /* If this is not really an XG entry just move on */ | |
633 | if ((xg_up->sg.src.s_addr != INADDR_ANY) | |
634 | || (xg_up->sg.grp.s_addr == INADDR_ANY)) { | |
635 | return; | |
636 | } | |
637 | ||
638 | /* XXX: Need to maintain SAs per-group to avoid all this unnecessary | |
639 | * walking */ | |
472ad383 | 640 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { |
d62a17ae | 641 | if (sa->sg.grp.s_addr != xg_up->sg.grp.s_addr) { |
642 | continue; | |
643 | } | |
644 | pim_msdp_sa_upstream_update(sa, xg_up, "up-jp-change"); | |
645 | } | |
646 | } | |
647 | ||
472ad383 | 648 | static void pim_msdp_up_xg_del(struct pim_instance *pim, struct prefix_sg *sg) |
d62a17ae | 649 | { |
650 | struct listnode *sanode; | |
651 | struct pim_msdp_sa *sa; | |
652 | ||
653 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
654 | zlog_debug("MSDP %s del", pim_str_sg_dump(sg)); | |
655 | } | |
656 | ||
657 | /* If this is not really an XG entry just move on */ | |
658 | if ((sg->src.s_addr != INADDR_ANY) || (sg->grp.s_addr == INADDR_ANY)) { | |
659 | return; | |
660 | } | |
661 | ||
662 | /* XXX: Need to maintain SAs per-group to avoid all this unnecessary | |
663 | * walking */ | |
472ad383 | 664 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { |
d62a17ae | 665 | if (sa->sg.grp.s_addr != sg->grp.s_addr) { |
666 | continue; | |
667 | } | |
668 | pim_msdp_sa_upstream_update(sa, NULL /* xg */, "up-jp-change"); | |
669 | } | |
670 | } | |
671 | ||
472ad383 | 672 | void pim_msdp_up_del(struct pim_instance *pim, struct prefix_sg *sg) |
d62a17ae | 673 | { |
674 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
675 | zlog_debug("MSDP up %s del", pim_str_sg_dump(sg)); | |
676 | } | |
677 | if (sg->src.s_addr == INADDR_ANY) { | |
472ad383 | 678 | pim_msdp_up_xg_del(pim, sg); |
d62a17ae | 679 | } else { |
472ad383 | 680 | pim_msdp_sa_local_del_on_up_del(pim, sg); |
d62a17ae | 681 | } |
36e466fe | 682 | } |
683 | ||
3c72d654 | 684 | /* sa hash and peer list helpers */ |
d8b87afe | 685 | static unsigned int pim_msdp_sa_hash_key_make(const void *p) |
3c72d654 | 686 | { |
d8b87afe | 687 | const struct pim_msdp_sa *sa = p; |
3c72d654 | 688 | |
d62a17ae | 689 | return (jhash_2words(sa->sg.src.s_addr, sa->sg.grp.s_addr, 0)); |
3c72d654 | 690 | } |
691 | ||
74df8d6d | 692 | static bool pim_msdp_sa_hash_eq(const void *p1, const void *p2) |
3c72d654 | 693 | { |
d62a17ae | 694 | const struct pim_msdp_sa *sa1 = p1; |
695 | const struct pim_msdp_sa *sa2 = p2; | |
3c72d654 | 696 | |
d62a17ae | 697 | return ((sa1->sg.src.s_addr == sa2->sg.src.s_addr) |
698 | && (sa1->sg.grp.s_addr == sa2->sg.grp.s_addr)); | |
3c72d654 | 699 | } |
700 | ||
d62a17ae | 701 | static int pim_msdp_sa_comp(const void *p1, const void *p2) |
3c72d654 | 702 | { |
d62a17ae | 703 | const struct pim_msdp_sa *sa1 = p1; |
704 | const struct pim_msdp_sa *sa2 = p2; | |
3c72d654 | 705 | |
d62a17ae | 706 | if (ntohl(sa1->sg.grp.s_addr) < ntohl(sa2->sg.grp.s_addr)) |
707 | return -1; | |
3c72d654 | 708 | |
d62a17ae | 709 | if (ntohl(sa1->sg.grp.s_addr) > ntohl(sa2->sg.grp.s_addr)) |
710 | return 1; | |
3c72d654 | 711 | |
d62a17ae | 712 | if (ntohl(sa1->sg.src.s_addr) < ntohl(sa2->sg.src.s_addr)) |
713 | return -1; | |
3c72d654 | 714 | |
d62a17ae | 715 | if (ntohl(sa1->sg.src.s_addr) > ntohl(sa2->sg.src.s_addr)) |
716 | return 1; | |
3c72d654 | 717 | |
d62a17ae | 718 | return 0; |
3c72d654 | 719 | } |
720 | ||
721 | /* RFC-3618:Sec-10.1.3 - Peer-RPF forwarding */ | |
722 | /* XXX: this can use a bit of refining and extensions */ | |
d62a17ae | 723 | bool pim_msdp_peer_rpf_check(struct pim_msdp_peer *mp, struct in_addr rp) |
3c72d654 | 724 | { |
d62a17ae | 725 | if (mp->peer.s_addr == rp.s_addr) { |
726 | return true; | |
727 | } | |
3c72d654 | 728 | |
d62a17ae | 729 | return false; |
3c72d654 | 730 | } |
d62a17ae | 731 | |
3c72d654 | 732 | /************************ Peer session management **************************/ |
d62a17ae | 733 | char *pim_msdp_state_dump(enum pim_msdp_peer_state state, char *buf, |
734 | int buf_size) | |
735 | { | |
736 | switch (state) { | |
737 | case PIM_MSDP_DISABLED: | |
738 | snprintf(buf, buf_size, "%s", "disabled"); | |
739 | break; | |
740 | case PIM_MSDP_INACTIVE: | |
741 | snprintf(buf, buf_size, "%s", "inactive"); | |
742 | break; | |
743 | case PIM_MSDP_LISTEN: | |
744 | snprintf(buf, buf_size, "%s", "listen"); | |
745 | break; | |
746 | case PIM_MSDP_CONNECTING: | |
747 | snprintf(buf, buf_size, "%s", "connecting"); | |
748 | break; | |
749 | case PIM_MSDP_ESTABLISHED: | |
750 | snprintf(buf, buf_size, "%s", "established"); | |
751 | break; | |
752 | default: | |
753 | snprintf(buf, buf_size, "unk-%d", state); | |
754 | } | |
755 | return buf; | |
756 | } | |
757 | ||
758 | char *pim_msdp_peer_key_dump(struct pim_msdp_peer *mp, char *buf, int buf_size, | |
759 | bool long_format) | |
760 | { | |
761 | char peer_str[INET_ADDRSTRLEN]; | |
762 | char local_str[INET_ADDRSTRLEN]; | |
763 | ||
764 | pim_inet4_dump("<peer?>", mp->peer, peer_str, sizeof(peer_str)); | |
765 | if (long_format) { | |
766 | pim_inet4_dump("<local?>", mp->local, local_str, | |
767 | sizeof(local_str)); | |
768 | snprintf(buf, buf_size, "MSDP peer %s local %s mg %s", peer_str, | |
769 | local_str, mp->mesh_group_name); | |
770 | } else { | |
771 | snprintf(buf, buf_size, "MSDP peer %s", peer_str); | |
772 | } | |
773 | ||
774 | return buf; | |
775 | } | |
776 | ||
777 | static void pim_msdp_peer_state_chg_log(struct pim_msdp_peer *mp) | |
778 | { | |
779 | char state_str[PIM_MSDP_STATE_STRLEN]; | |
780 | ||
781 | pim_msdp_state_dump(mp->state, state_str, sizeof(state_str)); | |
782 | zlog_debug("MSDP peer %s state chg to %s", mp->key_str, state_str); | |
2a333e0f | 783 | } |
784 | ||
785 | /* MSDP Connection State Machine actions (defined in RFC-3618:Sec-11.2) */ | |
786 | /* 11.2.A2: active peer - start connect retry timer; when the timer fires | |
787 | * a tcp connection will be made */ | |
d62a17ae | 788 | static void pim_msdp_peer_connect(struct pim_msdp_peer *mp) |
2a333e0f | 789 | { |
d62a17ae | 790 | mp->state = PIM_MSDP_CONNECTING; |
791 | if (PIM_DEBUG_MSDP_EVENTS) { | |
792 | pim_msdp_peer_state_chg_log(mp); | |
793 | } | |
2a333e0f | 794 | |
d62a17ae | 795 | pim_msdp_peer_cr_timer_setup(mp, true /* start */); |
2a333e0f | 796 | } |
797 | ||
798 | /* 11.2.A3: passive peer - just listen for connections */ | |
d62a17ae | 799 | static void pim_msdp_peer_listen(struct pim_msdp_peer *mp) |
2a333e0f | 800 | { |
d62a17ae | 801 | mp->state = PIM_MSDP_LISTEN; |
802 | if (PIM_DEBUG_MSDP_EVENTS) { | |
803 | pim_msdp_peer_state_chg_log(mp); | |
804 | } | |
2a333e0f | 805 | |
d62a17ae | 806 | /* this is interntionally asymmetric i.e. we set up listen-socket when |
9d303b37 DL |
807 | * the |
808 | * first listening peer is configured; but don't bother tearing it down | |
809 | * when | |
810 | * all the peers go down */ | |
472ad383 | 811 | pim_msdp_sock_listen(mp->pim); |
2a333e0f | 812 | } |
813 | ||
814 | /* 11.2.A4 and 11.2.A5: transition active or passive peer to | |
815 | * established state */ | |
d62a17ae | 816 | void pim_msdp_peer_established(struct pim_msdp_peer *mp) |
2a333e0f | 817 | { |
d62a17ae | 818 | if (mp->state != PIM_MSDP_ESTABLISHED) { |
819 | ++mp->est_flaps; | |
820 | } | |
977d71cc | 821 | |
d62a17ae | 822 | mp->state = PIM_MSDP_ESTABLISHED; |
823 | mp->uptime = pim_time_monotonic_sec(); | |
2a333e0f | 824 | |
d62a17ae | 825 | if (PIM_DEBUG_MSDP_EVENTS) { |
826 | pim_msdp_peer_state_chg_log(mp); | |
827 | } | |
2a333e0f | 828 | |
d62a17ae | 829 | /* stop retry timer on active peers */ |
830 | pim_msdp_peer_cr_timer_setup(mp, false /* start */); | |
2a333e0f | 831 | |
d62a17ae | 832 | /* send KA; start KA and hold timers */ |
833 | pim_msdp_pkt_ka_tx(mp); | |
834 | pim_msdp_peer_ka_timer_setup(mp, true /* start */); | |
835 | pim_msdp_peer_hold_timer_setup(mp, true /* start */); | |
2a333e0f | 836 | |
d62a17ae | 837 | pim_msdp_pkt_sa_tx_to_one_peer(mp); |
3c72d654 | 838 | |
d62a17ae | 839 | PIM_MSDP_PEER_WRITE_ON(mp); |
840 | PIM_MSDP_PEER_READ_ON(mp); | |
2a333e0f | 841 | } |
842 | ||
843 | /* 11.2.A6, 11.2.A7 and 11.2.A8: shutdown the peer tcp connection */ | |
d62a17ae | 844 | void pim_msdp_peer_stop_tcp_conn(struct pim_msdp_peer *mp, bool chg_state) |
845 | { | |
846 | if (chg_state) { | |
847 | if (mp->state == PIM_MSDP_ESTABLISHED) { | |
848 | ++mp->est_flaps; | |
849 | } | |
850 | mp->state = PIM_MSDP_INACTIVE; | |
851 | if (PIM_DEBUG_MSDP_EVENTS) { | |
852 | pim_msdp_peer_state_chg_log(mp); | |
853 | } | |
854 | } | |
855 | ||
856 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
857 | zlog_debug("MSDP peer %s pim_msdp_peer_stop_tcp_conn", | |
858 | mp->key_str); | |
859 | } | |
860 | /* stop read and write threads */ | |
861 | PIM_MSDP_PEER_READ_OFF(mp); | |
862 | PIM_MSDP_PEER_WRITE_OFF(mp); | |
863 | ||
864 | /* reset buffers */ | |
865 | mp->packet_size = 0; | |
866 | if (mp->ibuf) | |
867 | stream_reset(mp->ibuf); | |
868 | if (mp->obuf) | |
869 | stream_fifo_clean(mp->obuf); | |
870 | ||
871 | /* stop all peer timers */ | |
872 | pim_msdp_peer_ka_timer_setup(mp, false /* start */); | |
873 | pim_msdp_peer_cr_timer_setup(mp, false /* start */); | |
874 | pim_msdp_peer_hold_timer_setup(mp, false /* start */); | |
875 | ||
876 | /* close connection */ | |
877 | if (mp->fd >= 0) { | |
878 | close(mp->fd); | |
879 | mp->fd = -1; | |
880 | } | |
2a333e0f | 881 | } |
882 | ||
883 | /* RFC-3618:Sec-5.6 - stop the peer tcp connection and startover */ | |
d62a17ae | 884 | void pim_msdp_peer_reset_tcp_conn(struct pim_msdp_peer *mp, const char *rc_str) |
2a333e0f | 885 | { |
d62a17ae | 886 | if (PIM_DEBUG_EVENTS) { |
887 | zlog_debug("MSDP peer %s tcp reset %s", mp->key_str, rc_str); | |
888 | snprintf(mp->last_reset, sizeof(mp->last_reset), "%s", rc_str); | |
889 | } | |
2a333e0f | 890 | |
d62a17ae | 891 | /* close the connection and transition to listening or connecting */ |
892 | pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */); | |
893 | if (PIM_MSDP_PEER_IS_LISTENER(mp)) { | |
894 | pim_msdp_peer_listen(mp); | |
895 | } else { | |
896 | pim_msdp_peer_connect(mp); | |
897 | } | |
2a333e0f | 898 | } |
899 | ||
d62a17ae | 900 | static void pim_msdp_peer_timer_expiry_log(struct pim_msdp_peer *mp, |
901 | const char *timer_str) | |
2a333e0f | 902 | { |
d62a17ae | 903 | zlog_debug("MSDP peer %s %s timer expired", mp->key_str, timer_str); |
2a333e0f | 904 | } |
905 | ||
906 | /* RFC-3618:Sec-5.4 - peer hold timer */ | |
d62a17ae | 907 | static int pim_msdp_peer_hold_timer_cb(struct thread *t) |
2a333e0f | 908 | { |
d62a17ae | 909 | struct pim_msdp_peer *mp; |
2a333e0f | 910 | |
d62a17ae | 911 | mp = THREAD_ARG(t); |
2a333e0f | 912 | |
d62a17ae | 913 | if (PIM_DEBUG_MSDP_EVENTS) { |
914 | pim_msdp_peer_timer_expiry_log(mp, "hold"); | |
915 | } | |
2a333e0f | 916 | |
d62a17ae | 917 | if (mp->state != PIM_MSDP_ESTABLISHED) { |
918 | return 0; | |
919 | } | |
2a333e0f | 920 | |
d62a17ae | 921 | if (PIM_DEBUG_MSDP_EVENTS) { |
922 | pim_msdp_peer_state_chg_log(mp); | |
923 | } | |
924 | pim_msdp_peer_reset_tcp_conn(mp, "ht-expired"); | |
925 | return 0; | |
2a333e0f | 926 | } |
472ad383 | 927 | |
d62a17ae | 928 | static void pim_msdp_peer_hold_timer_setup(struct pim_msdp_peer *mp, bool start) |
2a333e0f | 929 | { |
472ad383 | 930 | struct pim_instance *pim = mp->pim; |
d62a17ae | 931 | THREAD_OFF(mp->hold_timer); |
932 | if (start) { | |
472ad383 | 933 | thread_add_timer(pim->msdp.master, pim_msdp_peer_hold_timer_cb, |
2ad78035 | 934 | mp, PIM_MSDP_PEER_HOLD_TIME, &mp->hold_timer); |
d62a17ae | 935 | } |
2a333e0f | 936 | } |
937 | ||
938 | ||
939 | /* RFC-3618:Sec-5.5 - peer keepalive timer */ | |
d62a17ae | 940 | static int pim_msdp_peer_ka_timer_cb(struct thread *t) |
2a333e0f | 941 | { |
d62a17ae | 942 | struct pim_msdp_peer *mp; |
2a333e0f | 943 | |
d62a17ae | 944 | mp = THREAD_ARG(t); |
2a333e0f | 945 | |
d62a17ae | 946 | if (PIM_DEBUG_MSDP_EVENTS) { |
947 | pim_msdp_peer_timer_expiry_log(mp, "ka"); | |
948 | } | |
2a333e0f | 949 | |
d62a17ae | 950 | pim_msdp_pkt_ka_tx(mp); |
951 | pim_msdp_peer_ka_timer_setup(mp, true /* start */); | |
952 | return 0; | |
2a333e0f | 953 | } |
d62a17ae | 954 | static void pim_msdp_peer_ka_timer_setup(struct pim_msdp_peer *mp, bool start) |
2a333e0f | 955 | { |
d62a17ae | 956 | THREAD_OFF(mp->ka_timer); |
957 | if (start) { | |
472ad383 DS |
958 | thread_add_timer(mp->pim->msdp.master, |
959 | pim_msdp_peer_ka_timer_cb, mp, | |
960 | PIM_MSDP_PEER_KA_TIME, &mp->ka_timer); | |
d62a17ae | 961 | } |
2a333e0f | 962 | } |
963 | ||
d62a17ae | 964 | static void pim_msdp_peer_active_connect(struct pim_msdp_peer *mp) |
2a333e0f | 965 | { |
d62a17ae | 966 | int rc; |
967 | ++mp->conn_attempts; | |
968 | rc = pim_msdp_sock_connect(mp); | |
2a333e0f | 969 | |
d62a17ae | 970 | if (PIM_DEBUG_MSDP_INTERNAL) { |
971 | zlog_debug("MSDP peer %s pim_msdp_peer_active_connect: %d", | |
972 | mp->key_str, rc); | |
973 | } | |
2a333e0f | 974 | |
d62a17ae | 975 | switch (rc) { |
976 | case connect_error: | |
977 | case -1: | |
978 | /* connect failed restart the connect-retry timer */ | |
979 | pim_msdp_peer_cr_timer_setup(mp, true /* start */); | |
980 | break; | |
2a333e0f | 981 | |
d62a17ae | 982 | case connect_success: |
983 | /* connect was sucessful move to established */ | |
984 | pim_msdp_peer_established(mp); | |
985 | break; | |
2a333e0f | 986 | |
d62a17ae | 987 | case connect_in_progress: |
988 | /* for NB content we need to wait till sock is readable or | |
989 | * writeable */ | |
990 | PIM_MSDP_PEER_WRITE_ON(mp); | |
991 | PIM_MSDP_PEER_READ_ON(mp); | |
992 | /* also restart connect-retry timer to reset the socket if | |
993 | * connect is | |
994 | * not sucessful */ | |
995 | pim_msdp_peer_cr_timer_setup(mp, true /* start */); | |
996 | break; | |
997 | } | |
2a333e0f | 998 | } |
999 | ||
1000 | /* RFC-3618:Sec-5.6 - connection retry on active peer */ | |
d62a17ae | 1001 | static int pim_msdp_peer_cr_timer_cb(struct thread *t) |
2a333e0f | 1002 | { |
d62a17ae | 1003 | struct pim_msdp_peer *mp; |
2a333e0f | 1004 | |
d62a17ae | 1005 | mp = THREAD_ARG(t); |
2a333e0f | 1006 | |
d62a17ae | 1007 | if (PIM_DEBUG_MSDP_EVENTS) { |
1008 | pim_msdp_peer_timer_expiry_log(mp, "connect-retry"); | |
1009 | } | |
2a333e0f | 1010 | |
d62a17ae | 1011 | if (mp->state != PIM_MSDP_CONNECTING || PIM_MSDP_PEER_IS_LISTENER(mp)) { |
1012 | return 0; | |
1013 | } | |
2a333e0f | 1014 | |
d62a17ae | 1015 | pim_msdp_peer_active_connect(mp); |
1016 | return 0; | |
2a333e0f | 1017 | } |
d62a17ae | 1018 | static void pim_msdp_peer_cr_timer_setup(struct pim_msdp_peer *mp, bool start) |
2a333e0f | 1019 | { |
d62a17ae | 1020 | THREAD_OFF(mp->cr_timer); |
1021 | if (start) { | |
472ad383 DS |
1022 | thread_add_timer( |
1023 | mp->pim->msdp.master, pim_msdp_peer_cr_timer_cb, mp, | |
1024 | PIM_MSDP_PEER_CONNECT_RETRY_TIME, &mp->cr_timer); | |
d62a17ae | 1025 | } |
2a333e0f | 1026 | } |
1027 | ||
1028 | /* if a valid packet is rxed from the peer we can restart hold timer */ | |
d62a17ae | 1029 | void pim_msdp_peer_pkt_rxed(struct pim_msdp_peer *mp) |
2a333e0f | 1030 | { |
d62a17ae | 1031 | if (mp->state == PIM_MSDP_ESTABLISHED) { |
1032 | pim_msdp_peer_hold_timer_setup(mp, true /* start */); | |
1033 | } | |
2a333e0f | 1034 | } |
1035 | ||
3c72d654 | 1036 | /* if a valid packet is txed to the peer we can restart ka timer and avoid |
1037 | * unnecessary ka noise in the network */ | |
d62a17ae | 1038 | void pim_msdp_peer_pkt_txed(struct pim_msdp_peer *mp) |
3c72d654 | 1039 | { |
d62a17ae | 1040 | if (mp->state == PIM_MSDP_ESTABLISHED) { |
1041 | pim_msdp_peer_ka_timer_setup(mp, true /* start */); | |
1042 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
1043 | zlog_debug("MSDP ka timer restart on pkt tx to %s", | |
1044 | mp->key_str); | |
1045 | } | |
1046 | } | |
3c72d654 | 1047 | } |
1048 | ||
2a333e0f | 1049 | static void pim_msdp_addr2su(union sockunion *su, struct in_addr addr) |
1050 | { | |
d62a17ae | 1051 | sockunion_init(su); |
1052 | su->sin.sin_addr = addr; | |
1053 | su->sin.sin_family = AF_INET; | |
2a333e0f | 1054 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 1055 | su->sin.sin_len = sizeof(struct sockaddr_in); |
2a333e0f | 1056 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
1057 | } | |
1058 | ||
1059 | /* 11.2.A1: create a new peer and transition state to listen or connecting */ | |
472ad383 DS |
1060 | static enum pim_msdp_err pim_msdp_peer_new(struct pim_instance *pim, |
1061 | struct in_addr peer_addr, | |
d62a17ae | 1062 | struct in_addr local_addr, |
1063 | const char *mesh_group_name, | |
1064 | struct pim_msdp_peer **mp_p) | |
1065 | { | |
1066 | struct pim_msdp_peer *mp; | |
1067 | ||
472ad383 | 1068 | pim_msdp_enable(pim); |
d62a17ae | 1069 | |
1070 | mp = XCALLOC(MTYPE_PIM_MSDP_PEER, sizeof(*mp)); | |
d62a17ae | 1071 | |
472ad383 | 1072 | mp->pim = pim; |
d62a17ae | 1073 | mp->peer = peer_addr; |
1074 | pim_inet4_dump("<peer?>", mp->peer, mp->key_str, sizeof(mp->key_str)); | |
1075 | pim_msdp_addr2su(&mp->su_peer, mp->peer); | |
1076 | mp->local = local_addr; | |
1077 | /* XXX: originator_id setting needs to move to the mesh group */ | |
472ad383 | 1078 | pim->msdp.originator_id = local_addr; |
d62a17ae | 1079 | pim_msdp_addr2su(&mp->su_local, mp->local); |
1080 | mp->mesh_group_name = XSTRDUP(MTYPE_PIM_MSDP_MG_NAME, mesh_group_name); | |
1081 | mp->state = PIM_MSDP_INACTIVE; | |
1082 | mp->fd = -1; | |
c35b7e6b | 1083 | strlcpy(mp->last_reset, "-", sizeof(mp->last_reset)); |
d62a17ae | 1084 | /* higher IP address is listener */ |
1085 | if (ntohl(mp->local.s_addr) > ntohl(mp->peer.s_addr)) { | |
1086 | mp->flags |= PIM_MSDP_PEERF_LISTENER; | |
1087 | } | |
1088 | ||
1089 | /* setup packet buffers */ | |
1090 | mp->ibuf = stream_new(PIM_MSDP_MAX_PACKET_SIZE); | |
1091 | mp->obuf = stream_fifo_new(); | |
1092 | ||
1093 | /* insert into misc tables for easy access */ | |
472ad383 DS |
1094 | mp = hash_get(pim->msdp.peer_hash, mp, hash_alloc_intern); |
1095 | listnode_add_sort(pim->msdp.peer_list, mp); | |
d62a17ae | 1096 | |
1097 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1098 | zlog_debug("MSDP peer %s created", mp->key_str); | |
1099 | ||
1100 | pim_msdp_peer_state_chg_log(mp); | |
1101 | } | |
1102 | ||
1103 | /* fireup the connect state machine */ | |
1104 | if (PIM_MSDP_PEER_IS_LISTENER(mp)) { | |
1105 | pim_msdp_peer_listen(mp); | |
1106 | } else { | |
1107 | pim_msdp_peer_connect(mp); | |
1108 | } | |
1109 | if (mp_p) { | |
1110 | *mp_p = mp; | |
1111 | } | |
1112 | return PIM_MSDP_ERR_NONE; | |
1113 | } | |
1114 | ||
472ad383 DS |
1115 | struct pim_msdp_peer *pim_msdp_peer_find(struct pim_instance *pim, |
1116 | struct in_addr peer_addr) | |
d62a17ae | 1117 | { |
1118 | struct pim_msdp_peer lookup; | |
1119 | ||
1120 | lookup.peer = peer_addr; | |
472ad383 | 1121 | return hash_lookup(pim->msdp.peer_hash, &lookup); |
2a333e0f | 1122 | } |
1123 | ||
1124 | /* add peer configuration if it doesn't already exist */ | |
472ad383 DS |
1125 | enum pim_msdp_err pim_msdp_peer_add(struct pim_instance *pim, |
1126 | struct in_addr peer_addr, | |
d62a17ae | 1127 | struct in_addr local_addr, |
1128 | const char *mesh_group_name, | |
1129 | struct pim_msdp_peer **mp_p) | |
2a333e0f | 1130 | { |
d62a17ae | 1131 | struct pim_msdp_peer *mp; |
2a333e0f | 1132 | |
d62a17ae | 1133 | if (mp_p) { |
1134 | *mp_p = NULL; | |
1135 | } | |
977d71cc | 1136 | |
d62a17ae | 1137 | if (peer_addr.s_addr == local_addr.s_addr) { |
1138 | /* skip session setup if config is invalid */ | |
1139 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1140 | char peer_str[INET_ADDRSTRLEN]; | |
977d71cc | 1141 | |
d62a17ae | 1142 | pim_inet4_dump("<peer?>", peer_addr, peer_str, |
1143 | sizeof(peer_str)); | |
1144 | zlog_debug("%s add skipped as DIP=SIP", peer_str); | |
1145 | } | |
1146 | return PIM_MSDP_ERR_SIP_EQ_DIP; | |
1147 | } | |
977d71cc | 1148 | |
472ad383 | 1149 | mp = pim_msdp_peer_find(pim, peer_addr); |
d62a17ae | 1150 | if (mp) { |
1151 | if (mp_p) { | |
1152 | *mp_p = mp; | |
1153 | } | |
1154 | return PIM_MSDP_ERR_PEER_EXISTS; | |
1155 | } | |
2a333e0f | 1156 | |
472ad383 DS |
1157 | return pim_msdp_peer_new(pim, peer_addr, local_addr, mesh_group_name, |
1158 | mp_p); | |
2a333e0f | 1159 | } |
1160 | ||
1161 | /* release all mem associated with a peer */ | |
d62a17ae | 1162 | static void pim_msdp_peer_free(struct pim_msdp_peer *mp) |
11128587 | 1163 | { |
ec2f0e53 DS |
1164 | /* |
1165 | * Let's make sure we are not running when we delete | |
1166 | * the underlying data structure | |
1167 | */ | |
845d9af7 | 1168 | pim_msdp_peer_stop_tcp_conn(mp, false); |
ec2f0e53 | 1169 | |
d62a17ae | 1170 | if (mp->ibuf) { |
1171 | stream_free(mp->ibuf); | |
1172 | } | |
2a333e0f | 1173 | |
d62a17ae | 1174 | if (mp->obuf) { |
1175 | stream_fifo_free(mp->obuf); | |
1176 | } | |
2a333e0f | 1177 | |
e1b36e13 | 1178 | XFREE(MTYPE_PIM_MSDP_MG_NAME, mp->mesh_group_name); |
845d9af7 DS |
1179 | |
1180 | mp->pim = NULL; | |
d62a17ae | 1181 | XFREE(MTYPE_PIM_MSDP_PEER, mp); |
2a333e0f | 1182 | } |
1183 | ||
1184 | /* delete the peer config */ | |
d62a17ae | 1185 | static enum pim_msdp_err pim_msdp_peer_do_del(struct pim_msdp_peer *mp) |
2a333e0f | 1186 | { |
d62a17ae | 1187 | /* stop the tcp connection and shutdown all timers */ |
1188 | pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */); | |
2a333e0f | 1189 | |
d62a17ae | 1190 | /* remove the session from various tables */ |
472ad383 DS |
1191 | listnode_delete(mp->pim->msdp.peer_list, mp); |
1192 | hash_release(mp->pim->msdp.peer_hash, mp); | |
2a333e0f | 1193 | |
d62a17ae | 1194 | if (PIM_DEBUG_MSDP_EVENTS) { |
1195 | zlog_debug("MSDP peer %s deleted", mp->key_str); | |
1196 | } | |
2a333e0f | 1197 | |
d62a17ae | 1198 | /* free up any associated memory */ |
1199 | pim_msdp_peer_free(mp); | |
2a333e0f | 1200 | |
d62a17ae | 1201 | return PIM_MSDP_ERR_NONE; |
2a333e0f | 1202 | } |
1203 | ||
472ad383 DS |
1204 | enum pim_msdp_err pim_msdp_peer_del(struct pim_instance *pim, |
1205 | struct in_addr peer_addr) | |
977d71cc | 1206 | { |
d62a17ae | 1207 | struct pim_msdp_peer *mp; |
977d71cc | 1208 | |
472ad383 | 1209 | mp = pim_msdp_peer_find(pim, peer_addr); |
d62a17ae | 1210 | if (!mp) { |
1211 | return PIM_MSDP_ERR_NO_PEER; | |
1212 | } | |
977d71cc | 1213 | |
d62a17ae | 1214 | return pim_msdp_peer_do_del(mp); |
977d71cc | 1215 | } |
1216 | ||
2a333e0f | 1217 | /* peer hash and peer list helpers */ |
d8b87afe | 1218 | static unsigned int pim_msdp_peer_hash_key_make(const void *p) |
2a333e0f | 1219 | { |
d8b87afe | 1220 | const struct pim_msdp_peer *mp = p; |
d62a17ae | 1221 | return (jhash_1word(mp->peer.s_addr, 0)); |
2a333e0f | 1222 | } |
1223 | ||
74df8d6d | 1224 | static bool pim_msdp_peer_hash_eq(const void *p1, const void *p2) |
2a333e0f | 1225 | { |
d62a17ae | 1226 | const struct pim_msdp_peer *mp1 = p1; |
1227 | const struct pim_msdp_peer *mp2 = p2; | |
2a333e0f | 1228 | |
d62a17ae | 1229 | return (mp1->peer.s_addr == mp2->peer.s_addr); |
2a333e0f | 1230 | } |
1231 | ||
d62a17ae | 1232 | static int pim_msdp_peer_comp(const void *p1, const void *p2) |
2a333e0f | 1233 | { |
d62a17ae | 1234 | const struct pim_msdp_peer *mp1 = p1; |
1235 | const struct pim_msdp_peer *mp2 = p2; | |
2a333e0f | 1236 | |
d62a17ae | 1237 | if (ntohl(mp1->peer.s_addr) < ntohl(mp2->peer.s_addr)) |
1238 | return -1; | |
2a333e0f | 1239 | |
d62a17ae | 1240 | if (ntohl(mp1->peer.s_addr) > ntohl(mp2->peer.s_addr)) |
1241 | return 1; | |
2a333e0f | 1242 | |
d62a17ae | 1243 | return 0; |
2a333e0f | 1244 | } |
1245 | ||
977d71cc | 1246 | /************************** Mesh group management **************************/ |
822d3c85 | 1247 | static void pim_msdp_mg_free(struct pim_instance *pim) |
977d71cc | 1248 | { |
822d3c85 DS |
1249 | struct pim_msdp_mg *mg = pim->msdp.mg; |
1250 | ||
d62a17ae | 1251 | /* If the mesh-group has valid member or src_ip don't delete it */ |
1252 | if (!mg || mg->mbr_cnt || (mg->src_ip.s_addr != INADDR_ANY)) { | |
1253 | return; | |
1254 | } | |
977d71cc | 1255 | |
d62a17ae | 1256 | if (PIM_DEBUG_MSDP_EVENTS) { |
1257 | zlog_debug("MSDP mesh-group %s deleted", mg->mesh_group_name); | |
1258 | } | |
0a22ddfb | 1259 | XFREE(MTYPE_PIM_MSDP_MG_NAME, mg->mesh_group_name); |
977d71cc | 1260 | |
d62a17ae | 1261 | if (mg->mbr_list) |
6a154c88 | 1262 | list_delete(&mg->mbr_list); |
b9b1e1f2 | 1263 | |
822d3c85 | 1264 | XFREE(MTYPE_PIM_MSDP_MG, pim->msdp.mg); |
977d71cc | 1265 | } |
1266 | ||
d62a17ae | 1267 | static struct pim_msdp_mg *pim_msdp_mg_new(const char *mesh_group_name) |
977d71cc | 1268 | { |
d62a17ae | 1269 | struct pim_msdp_mg *mg; |
977d71cc | 1270 | |
d62a17ae | 1271 | mg = XCALLOC(MTYPE_PIM_MSDP_MG, sizeof(*mg)); |
977d71cc | 1272 | |
d62a17ae | 1273 | mg->mesh_group_name = XSTRDUP(MTYPE_PIM_MSDP_MG_NAME, mesh_group_name); |
1274 | mg->mbr_list = list_new(); | |
1275 | mg->mbr_list->del = (void (*)(void *))pim_msdp_mg_mbr_free; | |
1276 | mg->mbr_list->cmp = (int (*)(void *, void *))pim_msdp_mg_mbr_comp; | |
977d71cc | 1277 | |
d62a17ae | 1278 | if (PIM_DEBUG_MSDP_EVENTS) { |
1279 | zlog_debug("MSDP mesh-group %s created", mg->mesh_group_name); | |
1280 | } | |
1281 | return mg; | |
977d71cc | 1282 | } |
1283 | ||
472ad383 DS |
1284 | enum pim_msdp_err pim_msdp_mg_del(struct pim_instance *pim, |
1285 | const char *mesh_group_name) | |
977d71cc | 1286 | { |
472ad383 | 1287 | struct pim_msdp_mg *mg = pim->msdp.mg; |
d62a17ae | 1288 | struct pim_msdp_mg_mbr *mbr; |
977d71cc | 1289 | |
d62a17ae | 1290 | if (!mg || strcmp(mg->mesh_group_name, mesh_group_name)) { |
1291 | return PIM_MSDP_ERR_NO_MG; | |
1292 | } | |
977d71cc | 1293 | |
d62a17ae | 1294 | /* delete all the mesh-group members */ |
1295 | while (!list_isempty(mg->mbr_list)) { | |
1296 | mbr = listnode_head(mg->mbr_list); | |
1297 | pim_msdp_mg_mbr_do_del(mg, mbr); | |
1298 | } | |
977d71cc | 1299 | |
d62a17ae | 1300 | /* clear src ip */ |
1301 | mg->src_ip.s_addr = INADDR_ANY; | |
977d71cc | 1302 | |
d62a17ae | 1303 | /* free up the mesh-group */ |
822d3c85 | 1304 | pim_msdp_mg_free(pim); |
d62a17ae | 1305 | return PIM_MSDP_ERR_NONE; |
977d71cc | 1306 | } |
1307 | ||
472ad383 DS |
1308 | static enum pim_msdp_err pim_msdp_mg_add(struct pim_instance *pim, |
1309 | const char *mesh_group_name) | |
977d71cc | 1310 | { |
472ad383 DS |
1311 | if (pim->msdp.mg) { |
1312 | if (!strcmp(pim->msdp.mg->mesh_group_name, mesh_group_name)) { | |
d62a17ae | 1313 | return PIM_MSDP_ERR_NONE; |
1314 | } | |
1315 | /* currently only one mesh-group can exist at a time */ | |
1316 | return PIM_MSDP_ERR_MAX_MESH_GROUPS; | |
1317 | } | |
977d71cc | 1318 | |
472ad383 DS |
1319 | pim->msdp.mg = pim_msdp_mg_new(mesh_group_name); |
1320 | if (!pim->msdp.mg) { | |
d62a17ae | 1321 | return PIM_MSDP_ERR_OOM; |
1322 | } | |
977d71cc | 1323 | |
d62a17ae | 1324 | return PIM_MSDP_ERR_NONE; |
977d71cc | 1325 | } |
1326 | ||
d62a17ae | 1327 | static int pim_msdp_mg_mbr_comp(const void *p1, const void *p2) |
977d71cc | 1328 | { |
d62a17ae | 1329 | const struct pim_msdp_mg_mbr *mbr1 = p1; |
1330 | const struct pim_msdp_mg_mbr *mbr2 = p2; | |
977d71cc | 1331 | |
d62a17ae | 1332 | if (ntohl(mbr1->mbr_ip.s_addr) < ntohl(mbr2->mbr_ip.s_addr)) |
1333 | return -1; | |
977d71cc | 1334 | |
d62a17ae | 1335 | if (ntohl(mbr1->mbr_ip.s_addr) > ntohl(mbr2->mbr_ip.s_addr)) |
1336 | return 1; | |
977d71cc | 1337 | |
d62a17ae | 1338 | return 0; |
977d71cc | 1339 | } |
1340 | ||
d62a17ae | 1341 | static void pim_msdp_mg_mbr_free(struct pim_msdp_mg_mbr *mbr) |
977d71cc | 1342 | { |
d62a17ae | 1343 | XFREE(MTYPE_PIM_MSDP_MG_MBR, mbr); |
977d71cc | 1344 | } |
1345 | ||
472ad383 DS |
1346 | static struct pim_msdp_mg_mbr *pim_msdp_mg_mbr_find(struct pim_instance *pim, |
1347 | struct in_addr mbr_ip) | |
977d71cc | 1348 | { |
d62a17ae | 1349 | struct pim_msdp_mg_mbr *mbr; |
1350 | struct listnode *mbr_node; | |
977d71cc | 1351 | |
472ad383 | 1352 | if (!pim->msdp.mg) { |
d62a17ae | 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 */ | |
472ad383 | 1357 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.mg->mbr_list, mbr_node, mbr)) { |
d62a17ae | 1358 | if (mbr->mbr_ip.s_addr == mbr_ip.s_addr) { |
1359 | return mbr; | |
1360 | } | |
1361 | } | |
1362 | return mbr; | |
977d71cc | 1363 | } |
1364 | ||
472ad383 DS |
1365 | enum pim_msdp_err pim_msdp_mg_mbr_add(struct pim_instance *pim, |
1366 | const char *mesh_group_name, | |
d62a17ae | 1367 | struct in_addr mbr_ip) |
977d71cc | 1368 | { |
d62a17ae | 1369 | int rc; |
1370 | struct pim_msdp_mg_mbr *mbr; | |
1371 | struct pim_msdp_mg *mg; | |
977d71cc | 1372 | |
472ad383 | 1373 | rc = pim_msdp_mg_add(pim, mesh_group_name); |
d62a17ae | 1374 | if (rc != PIM_MSDP_ERR_NONE) { |
1375 | return rc; | |
1376 | } | |
977d71cc | 1377 | |
472ad383 DS |
1378 | mg = pim->msdp.mg; |
1379 | mbr = pim_msdp_mg_mbr_find(pim, mbr_ip); | |
d62a17ae | 1380 | if (mbr) { |
1381 | return PIM_MSDP_ERR_MG_MBR_EXISTS; | |
1382 | } | |
977d71cc | 1383 | |
d62a17ae | 1384 | mbr = XCALLOC(MTYPE_PIM_MSDP_MG_MBR, sizeof(*mbr)); |
d62a17ae | 1385 | mbr->mbr_ip = mbr_ip; |
1386 | listnode_add_sort(mg->mbr_list, mbr); | |
977d71cc | 1387 | |
d62a17ae | 1388 | /* if valid SIP has been configured add peer session */ |
1389 | if (mg->src_ip.s_addr != INADDR_ANY) { | |
472ad383 | 1390 | pim_msdp_peer_add(pim, mbr_ip, mg->src_ip, mesh_group_name, |
d62a17ae | 1391 | &mbr->mp); |
1392 | } | |
977d71cc | 1393 | |
d62a17ae | 1394 | if (PIM_DEBUG_MSDP_EVENTS) { |
1395 | char ip_str[INET_ADDRSTRLEN]; | |
1396 | pim_inet4_dump("<mbr?>", mbr->mbr_ip, ip_str, sizeof(ip_str)); | |
1397 | zlog_debug("MSDP mesh-group %s mbr %s created", | |
1398 | mg->mesh_group_name, ip_str); | |
1399 | } | |
1400 | ++mg->mbr_cnt; | |
1401 | return PIM_MSDP_ERR_NONE; | |
977d71cc | 1402 | } |
1403 | ||
d62a17ae | 1404 | static void pim_msdp_mg_mbr_do_del(struct pim_msdp_mg *mg, |
1405 | struct pim_msdp_mg_mbr *mbr) | |
977d71cc | 1406 | { |
d62a17ae | 1407 | /* Delete active peer session if any */ |
1408 | if (mbr->mp) { | |
1409 | pim_msdp_peer_do_del(mbr->mp); | |
1410 | } | |
977d71cc | 1411 | |
d62a17ae | 1412 | listnode_delete(mg->mbr_list, mbr); |
1413 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1414 | char ip_str[INET_ADDRSTRLEN]; | |
1415 | pim_inet4_dump("<mbr?>", mbr->mbr_ip, ip_str, sizeof(ip_str)); | |
1416 | zlog_debug("MSDP mesh-group %s mbr %s deleted", | |
1417 | mg->mesh_group_name, ip_str); | |
1418 | } | |
1419 | pim_msdp_mg_mbr_free(mbr); | |
1420 | if (mg->mbr_cnt) { | |
1421 | --mg->mbr_cnt; | |
1422 | } | |
977d71cc | 1423 | } |
1424 | ||
472ad383 DS |
1425 | enum pim_msdp_err pim_msdp_mg_mbr_del(struct pim_instance *pim, |
1426 | const char *mesh_group_name, | |
d62a17ae | 1427 | struct in_addr mbr_ip) |
1428 | { | |
1429 | struct pim_msdp_mg_mbr *mbr; | |
472ad383 | 1430 | struct pim_msdp_mg *mg = pim->msdp.mg; |
d62a17ae | 1431 | |
1432 | if (!mg || strcmp(mg->mesh_group_name, mesh_group_name)) { | |
1433 | return PIM_MSDP_ERR_NO_MG; | |
1434 | } | |
1435 | ||
472ad383 | 1436 | mbr = pim_msdp_mg_mbr_find(pim, mbr_ip); |
d62a17ae | 1437 | if (!mbr) { |
1438 | return PIM_MSDP_ERR_NO_MG_MBR; | |
1439 | } | |
1440 | ||
1441 | pim_msdp_mg_mbr_do_del(mg, mbr); | |
1442 | /* if there are no references to the mg free it */ | |
822d3c85 | 1443 | pim_msdp_mg_free(pim); |
d62a17ae | 1444 | |
1445 | return PIM_MSDP_ERR_NONE; | |
1446 | } | |
1447 | ||
472ad383 | 1448 | static void pim_msdp_mg_src_do_del(struct pim_instance *pim) |
d62a17ae | 1449 | { |
1450 | struct pim_msdp_mg_mbr *mbr; | |
1451 | struct listnode *mbr_node; | |
472ad383 | 1452 | struct pim_msdp_mg *mg = pim->msdp.mg; |
d62a17ae | 1453 | |
1454 | /* SIP is being removed - tear down all active peer sessions */ | |
1455 | for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbr_node, mbr)) { | |
1456 | if (mbr->mp) { | |
1457 | pim_msdp_peer_do_del(mbr->mp); | |
1458 | mbr->mp = NULL; | |
1459 | } | |
1460 | } | |
1461 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1462 | zlog_debug("MSDP mesh-group %s src cleared", | |
1463 | mg->mesh_group_name); | |
1464 | } | |
1465 | } | |
1466 | ||
472ad383 DS |
1467 | enum pim_msdp_err pim_msdp_mg_src_del(struct pim_instance *pim, |
1468 | const char *mesh_group_name) | |
d62a17ae | 1469 | { |
472ad383 | 1470 | struct pim_msdp_mg *mg = pim->msdp.mg; |
d62a17ae | 1471 | |
1472 | if (!mg || strcmp(mg->mesh_group_name, mesh_group_name)) { | |
1473 | return PIM_MSDP_ERR_NO_MG; | |
1474 | } | |
1475 | ||
1476 | if (mg->src_ip.s_addr != INADDR_ANY) { | |
1477 | mg->src_ip.s_addr = INADDR_ANY; | |
472ad383 | 1478 | pim_msdp_mg_src_do_del(pim); |
d62a17ae | 1479 | /* if there are no references to the mg free it */ |
822d3c85 | 1480 | pim_msdp_mg_free(pim); |
d62a17ae | 1481 | } |
1482 | return PIM_MSDP_ERR_NONE; | |
1483 | } | |
1484 | ||
472ad383 DS |
1485 | enum pim_msdp_err pim_msdp_mg_src_add(struct pim_instance *pim, |
1486 | const char *mesh_group_name, | |
d62a17ae | 1487 | struct in_addr src_ip) |
1488 | { | |
1489 | int rc; | |
1490 | struct pim_msdp_mg_mbr *mbr; | |
1491 | struct listnode *mbr_node; | |
1492 | struct pim_msdp_mg *mg; | |
1493 | ||
1494 | if (src_ip.s_addr == INADDR_ANY) { | |
472ad383 | 1495 | pim_msdp_mg_src_del(pim, mesh_group_name); |
d62a17ae | 1496 | return PIM_MSDP_ERR_NONE; |
1497 | } | |
1498 | ||
472ad383 | 1499 | rc = pim_msdp_mg_add(pim, mesh_group_name); |
d62a17ae | 1500 | if (rc != PIM_MSDP_ERR_NONE) { |
1501 | return rc; | |
1502 | } | |
1503 | ||
472ad383 | 1504 | mg = pim->msdp.mg; |
d62a17ae | 1505 | if (mg->src_ip.s_addr != INADDR_ANY) { |
472ad383 | 1506 | pim_msdp_mg_src_do_del(pim); |
d62a17ae | 1507 | } |
1508 | mg->src_ip = src_ip; | |
977d71cc | 1509 | |
d62a17ae | 1510 | for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbr_node, mbr)) { |
472ad383 | 1511 | pim_msdp_peer_add(pim, mbr->mbr_ip, mg->src_ip, mesh_group_name, |
d62a17ae | 1512 | &mbr->mp); |
1513 | } | |
977d71cc | 1514 | |
d62a17ae | 1515 | if (PIM_DEBUG_MSDP_EVENTS) { |
1516 | char ip_str[INET_ADDRSTRLEN]; | |
1517 | pim_inet4_dump("<src?>", mg->src_ip, ip_str, sizeof(ip_str)); | |
1518 | zlog_debug("MSDP mesh-group %s src %s set", mg->mesh_group_name, | |
1519 | ip_str); | |
1520 | } | |
1521 | return PIM_MSDP_ERR_NONE; | |
977d71cc | 1522 | } |
1523 | ||
3c72d654 | 1524 | /*********************** MSDP feature APIs *********************************/ |
84f25989 DS |
1525 | int pim_msdp_config_write(struct pim_instance *pim, struct vty *vty, |
1526 | const char *spaces) | |
d62a17ae | 1527 | { |
1528 | struct listnode *mbrnode; | |
1529 | struct pim_msdp_mg_mbr *mbr; | |
472ad383 | 1530 | struct pim_msdp_mg *mg = pim->msdp.mg; |
d62a17ae | 1531 | char mbr_str[INET_ADDRSTRLEN]; |
1532 | char src_str[INET_ADDRSTRLEN]; | |
1533 | int count = 0; | |
1534 | ||
1535 | if (!mg) { | |
1536 | return count; | |
1537 | } | |
1538 | ||
1539 | if (mg->src_ip.s_addr != INADDR_ANY) { | |
1540 | pim_inet4_dump("<src?>", mg->src_ip, src_str, sizeof(src_str)); | |
c9657fdc | 1541 | vty_out(vty, "%sip msdp mesh-group %s source %s\n", spaces, |
d62a17ae | 1542 | mg->mesh_group_name, src_str); |
1543 | ++count; | |
1544 | } | |
1545 | ||
1546 | for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbrnode, mbr)) { | |
1547 | pim_inet4_dump("<mbr?>", mbr->mbr_ip, mbr_str, sizeof(mbr_str)); | |
c9657fdc | 1548 | vty_out(vty, "%sip msdp mesh-group %s member %s\n", spaces, |
d62a17ae | 1549 | mg->mesh_group_name, mbr_str); |
1550 | ++count; | |
1551 | } | |
1552 | return count; | |
472ad383 DS |
1553 | } |
1554 | ||
3c72d654 | 1555 | /* Enable feature including active/periodic timers etc. on the first peer |
1556 | * config. Till then MSDP should just stay quiet. */ | |
472ad383 | 1557 | static void pim_msdp_enable(struct pim_instance *pim) |
3c72d654 | 1558 | { |
472ad383 | 1559 | if (pim->msdp.flags & PIM_MSDPF_ENABLE) { |
d62a17ae | 1560 | /* feature is already enabled */ |
1561 | return; | |
1562 | } | |
472ad383 DS |
1563 | pim->msdp.flags |= PIM_MSDPF_ENABLE; |
1564 | pim->msdp.work_obuf = stream_new(PIM_MSDP_MAX_PACKET_SIZE); | |
1565 | pim_msdp_sa_adv_timer_setup(pim, true /* start */); | |
d62a17ae | 1566 | /* setup sa cache based on local sources */ |
472ad383 | 1567 | pim_msdp_sa_local_setup(pim); |
3c72d654 | 1568 | } |
1569 | ||
2a333e0f | 1570 | /* MSDP init */ |
64c86530 | 1571 | void pim_msdp_init(struct pim_instance *pim, struct thread_master *master) |
2a333e0f | 1572 | { |
472ad383 | 1573 | pim->msdp.master = master; |
9fb302f4 | 1574 | char hash_name[64]; |
3c72d654 | 1575 | |
9fb302f4 | 1576 | snprintf(hash_name, 64, "PIM %s MSDP Peer Hash", pim->vrf->name); |
2ad78035 | 1577 | pim->msdp.peer_hash = hash_create(pim_msdp_peer_hash_key_make, |
9fb302f4 | 1578 | pim_msdp_peer_hash_eq, hash_name); |
2ad78035 DS |
1579 | pim->msdp.peer_list = list_new(); |
1580 | pim->msdp.peer_list->del = (void (*)(void *))pim_msdp_peer_free; | |
1581 | pim->msdp.peer_list->cmp = (int (*)(void *, void *))pim_msdp_peer_comp; | |
3c72d654 | 1582 | |
9fb302f4 | 1583 | snprintf(hash_name, 64, "PIM %s MSDP SA Hash", pim->vrf->name); |
2ad78035 | 1584 | pim->msdp.sa_hash = hash_create(pim_msdp_sa_hash_key_make, |
9fb302f4 | 1585 | pim_msdp_sa_hash_eq, hash_name); |
2ad78035 DS |
1586 | pim->msdp.sa_list = list_new(); |
1587 | pim->msdp.sa_list->del = (void (*)(void *))pim_msdp_sa_free; | |
1588 | pim->msdp.sa_list->cmp = (int (*)(void *, void *))pim_msdp_sa_comp; | |
2a333e0f | 1589 | } |
1590 | ||
1591 | /* counterpart to MSDP init; XXX: unused currently */ | |
2ad78035 | 1592 | void pim_msdp_exit(struct pim_instance *pim) |
2a333e0f | 1593 | { |
ec2f0e53 DS |
1594 | pim_msdp_sa_adv_timer_setup(pim, false); |
1595 | ||
d62a17ae | 1596 | /* XXX: stop listener and delete all peer sessions */ |
2a333e0f | 1597 | |
822d3c85 DS |
1598 | pim_msdp_mg_free(pim); |
1599 | ||
2ad78035 | 1600 | if (pim->msdp.peer_hash) { |
36ef2c10 | 1601 | hash_clean(pim->msdp.peer_hash, NULL); |
2ad78035 DS |
1602 | hash_free(pim->msdp.peer_hash); |
1603 | pim->msdp.peer_hash = NULL; | |
d62a17ae | 1604 | } |
2a333e0f | 1605 | |
2ad78035 | 1606 | if (pim->msdp.peer_list) { |
6a154c88 | 1607 | list_delete(&pim->msdp.peer_list); |
d62a17ae | 1608 | } |
3da8a099 DS |
1609 | |
1610 | if (pim->msdp.sa_hash) { | |
36ef2c10 | 1611 | hash_clean(pim->msdp.sa_hash, NULL); |
3da8a099 DS |
1612 | hash_free(pim->msdp.sa_hash); |
1613 | pim->msdp.sa_hash = NULL; | |
1614 | } | |
1615 | ||
1616 | if (pim->msdp.sa_list) { | |
6a154c88 | 1617 | list_delete(&pim->msdp.sa_list); |
3da8a099 | 1618 | } |
36ef2c10 DS |
1619 | |
1620 | if (pim->msdp.work_obuf) | |
1621 | stream_free(pim->msdp.work_obuf); | |
1622 | pim->msdp.work_obuf = NULL; | |
11128587 | 1623 | } |