]>
Commit | Line | Data |
---|---|---|
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> | |
11128587 | 31 | |
2a333e0f | 32 | #include "pimd.h" |
33 | #include "pim_cmd.h" | |
34 | #include "pim_memory.h" | |
7176984f | 35 | #include "pim_iface.h" |
3c72d654 | 36 | #include "pim_rp.h" |
2a333e0f | 37 | #include "pim_str.h" |
38 | #include "pim_time.h" | |
1bf16443 | 39 | #include "pim_upstream.h" |
472ad383 | 40 | #include "pim_oil.h" |
11128587 | 41 | |
2a333e0f | 42 | #include "pim_msdp.h" |
43 | #include "pim_msdp_packet.h" | |
44 | #include "pim_msdp_socket.h" | |
45 | ||
2ad78035 | 46 | // struct pim_msdp pim_msdp, *msdp = &pim_msdp; |
2a333e0f | 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); | |
d62a17ae | 51 | static void pim_msdp_peer_hold_timer_setup(struct pim_msdp_peer *mp, |
52 | bool start); | |
2a333e0f | 53 | static void pim_msdp_peer_free(struct pim_msdp_peer *mp); |
472ad383 DS |
54 | static void pim_msdp_enable(struct pim_instance *pim); |
55 | static void pim_msdp_sa_adv_timer_setup(struct pim_instance *pim, bool start); | |
d62a17ae | 56 | static void pim_msdp_sa_deref(struct pim_msdp_sa *sa, |
57 | enum pim_msdp_sa_flags flags); | |
977d71cc | 58 | static int pim_msdp_mg_mbr_comp(const void *p1, const void *p2); |
59 | static void pim_msdp_mg_mbr_free(struct pim_msdp_mg_mbr *mbr); | |
d62a17ae | 60 | static void pim_msdp_mg_mbr_do_del(struct pim_msdp_mg *mg, |
61 | struct pim_msdp_mg_mbr *mbr); | |
2a333e0f | 62 | |
3c72d654 | 63 | /************************ SA cache management ******************************/ |
d62a17ae | 64 | static void pim_msdp_sa_timer_expiry_log(struct pim_msdp_sa *sa, |
65 | const char *timer_str) | |
3c72d654 | 66 | { |
d62a17ae | 67 | zlog_debug("MSDP SA %s %s timer expired", sa->sg_str, timer_str); |
3c72d654 | 68 | } |
69 | ||
70 | /* RFC-3618:Sec-5.1 - global active source advertisement timer */ | |
d62a17ae | 71 | static int pim_msdp_sa_adv_timer_cb(struct thread *t) |
3c72d654 | 72 | { |
472ad383 DS |
73 | struct pim_instance *pim = THREAD_ARG(t); |
74 | ||
d62a17ae | 75 | if (PIM_DEBUG_MSDP_EVENTS) { |
76 | zlog_debug("MSDP SA advertisment timer expired"); | |
77 | } | |
3c72d654 | 78 | |
472ad383 DS |
79 | pim_msdp_sa_adv_timer_setup(pim, true /* start */); |
80 | pim_msdp_pkt_sa_tx(pim); | |
d62a17ae | 81 | return 0; |
3c72d654 | 82 | } |
472ad383 | 83 | static void pim_msdp_sa_adv_timer_setup(struct pim_instance *pim, bool start) |
3c72d654 | 84 | { |
472ad383 | 85 | THREAD_OFF(pim->msdp.sa_adv_timer); |
d62a17ae | 86 | if (start) { |
472ad383 DS |
87 | thread_add_timer(pim->msdp.master, pim_msdp_sa_adv_timer_cb, |
88 | pim, PIM_MSDP_SA_ADVERTISMENT_TIME, | |
89 | &pim->msdp.sa_adv_timer); | |
d62a17ae | 90 | } |
3c72d654 | 91 | } |
92 | ||
93 | /* RFC-3618:Sec-5.3 - SA cache state timer */ | |
d62a17ae | 94 | static int pim_msdp_sa_state_timer_cb(struct thread *t) |
3c72d654 | 95 | { |
d62a17ae | 96 | struct pim_msdp_sa *sa; |
3c72d654 | 97 | |
d62a17ae | 98 | sa = THREAD_ARG(t); |
3c72d654 | 99 | |
d62a17ae | 100 | if (PIM_DEBUG_MSDP_EVENTS) { |
101 | pim_msdp_sa_timer_expiry_log(sa, "state"); | |
102 | } | |
3c72d654 | 103 | |
d62a17ae | 104 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_PEER); |
105 | return 0; | |
3c72d654 | 106 | } |
d62a17ae | 107 | static void pim_msdp_sa_state_timer_setup(struct pim_msdp_sa *sa, bool start) |
3c72d654 | 108 | { |
d62a17ae | 109 | THREAD_OFF(sa->sa_state_timer); |
110 | if (start) { | |
472ad383 DS |
111 | thread_add_timer(sa->pim->msdp.master, |
112 | pim_msdp_sa_state_timer_cb, sa, | |
113 | PIM_MSDP_SA_HOLD_TIME, &sa->sa_state_timer); | |
d62a17ae | 114 | } |
3c72d654 | 115 | } |
116 | ||
d62a17ae | 117 | static void pim_msdp_sa_upstream_del(struct pim_msdp_sa *sa) |
7667c556 | 118 | { |
d62a17ae | 119 | struct pim_upstream *up = sa->up; |
120 | if (!up) { | |
121 | return; | |
122 | } | |
7667c556 | 123 | |
d62a17ae | 124 | sa->up = NULL; |
125 | if (PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(up->flags)) { | |
126 | PIM_UPSTREAM_FLAG_UNSET_SRC_MSDP(up->flags); | |
127 | sa->flags |= PIM_MSDP_SAF_UP_DEL_IN_PROG; | |
472ad383 | 128 | pim_upstream_del(sa->pim, up, __PRETTY_FUNCTION__); |
d62a17ae | 129 | sa->flags &= ~PIM_MSDP_SAF_UP_DEL_IN_PROG; |
130 | } | |
7667c556 | 131 | |
d62a17ae | 132 | if (PIM_DEBUG_MSDP_EVENTS) { |
133 | zlog_debug("MSDP SA %s de-referenced SPT", sa->sg_str); | |
134 | } | |
7667c556 | 135 | } |
136 | ||
d62a17ae | 137 | static bool pim_msdp_sa_upstream_add_ok(struct pim_msdp_sa *sa, |
138 | struct pim_upstream *xg_up) | |
7667c556 | 139 | { |
d62a17ae | 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 */ | |
472ad383 | 145 | if (!I_am_RP(sa->pim, sa->sg.grp)) { |
d62a17ae | 146 | return false; |
147 | } | |
7667c556 | 148 | |
d62a17ae | 149 | /* check if we have a (*, G) with a non-empty immediate OIL */ |
150 | if (!xg_up) { | |
151 | struct prefix_sg sg; | |
7667c556 | 152 | |
d62a17ae | 153 | memset(&sg, 0, sizeof(sg)); |
154 | sg.grp = sa->sg.grp; | |
7667c556 | 155 | |
472ad383 | 156 | xg_up = pim_upstream_find(sa->pim, &sg); |
d62a17ae | 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 | |
161 | * rest of | |
162 | * the magic */ | |
163 | return false; | |
164 | } | |
7667c556 | 165 | |
d62a17ae | 166 | return true; |
7667c556 | 167 | } |
168 | ||
169 | /* Upstream add evaluation needs to happen everytime - | |
170 | * 1. Peer reference is added or removed. | |
1bf16443 | 171 | * 2. The RP for a group changes. |
172 | * 3. joinDesired for the associated (*, G) changes | |
173 | * 4. associated (*, G) is removed - this seems like a bit redundant | |
7667c556 | 174 | * (considering #4); but just in case an entry gets nuked without |
175 | * upstream state transition | |
176 | * */ | |
d62a17ae | 177 | static void pim_msdp_sa_upstream_update(struct pim_msdp_sa *sa, |
178 | struct pim_upstream *xg_up, | |
179 | const char *ctx) | |
180 | { | |
181 | struct pim_upstream *up; | |
182 | ||
183 | if (!pim_msdp_sa_upstream_add_ok(sa, xg_up)) { | |
184 | pim_msdp_sa_upstream_del(sa); | |
185 | return; | |
186 | } | |
187 | ||
188 | if (sa->up) { | |
189 | /* nothing to do */ | |
190 | return; | |
191 | } | |
192 | ||
472ad383 | 193 | up = pim_upstream_find(sa->pim, &sa->sg); |
d62a17ae | 194 | if (up && (PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(up->flags))) { |
195 | /* somehow we lost track of the upstream ptr? best log it */ | |
196 | sa->up = up; | |
197 | if (PIM_DEBUG_MSDP_EVENTS) { | |
198 | zlog_debug("MSDP SA %s SPT reference missing", | |
199 | sa->sg_str); | |
200 | } | |
201 | return; | |
202 | } | |
203 | ||
204 | /* RFC3618: "RP triggers a (S, G) join event towards the data source | |
205 | * as if a JP message was rxed addressed to the RP itself." */ | |
2002dcdb | 206 | up = pim_upstream_add(sa->pim, &sa->sg, NULL /* iif */, |
d62a17ae | 207 | PIM_UPSTREAM_FLAG_MASK_SRC_MSDP, |
0885a9f1 | 208 | __PRETTY_FUNCTION__, NULL); |
d62a17ae | 209 | |
210 | sa->up = up; | |
211 | if (up) { | |
212 | /* update inherited oil */ | |
472ad383 | 213 | pim_upstream_inherited_olist(sa->pim, up); |
d62a17ae | 214 | /* should we also start the kat in parallel? we will need it |
215 | * when the | |
216 | * SA ages out */ | |
217 | if (PIM_DEBUG_MSDP_EVENTS) { | |
218 | zlog_debug("MSDP SA %s referenced SPT", sa->sg_str); | |
219 | } | |
220 | } else { | |
221 | if (PIM_DEBUG_MSDP_EVENTS) { | |
222 | zlog_debug("MSDP SA %s SPT reference failed", | |
223 | sa->sg_str); | |
224 | } | |
225 | } | |
7667c556 | 226 | } |
227 | ||
3c72d654 | 228 | /* release all mem associated with a sa */ |
d62a17ae | 229 | static void pim_msdp_sa_free(struct pim_msdp_sa *sa) |
3c72d654 | 230 | { |
ec2f0e53 DS |
231 | pim_msdp_sa_state_timer_setup(sa, false); |
232 | ||
d62a17ae | 233 | XFREE(MTYPE_PIM_MSDP_SA, sa); |
3c72d654 | 234 | } |
235 | ||
472ad383 DS |
236 | static struct pim_msdp_sa *pim_msdp_sa_new(struct pim_instance *pim, |
237 | struct prefix_sg *sg, | |
d62a17ae | 238 | struct in_addr rp) |
3c72d654 | 239 | { |
d62a17ae | 240 | struct pim_msdp_sa *sa; |
3c72d654 | 241 | |
d62a17ae | 242 | sa = XCALLOC(MTYPE_PIM_MSDP_SA, sizeof(*sa)); |
3c72d654 | 243 | |
472ad383 | 244 | sa->pim = pim; |
d62a17ae | 245 | sa->sg = *sg; |
246 | pim_str_sg_set(sg, sa->sg_str); | |
247 | sa->rp = rp; | |
248 | sa->uptime = pim_time_monotonic_sec(); | |
3c72d654 | 249 | |
d62a17ae | 250 | /* insert into misc tables for easy access */ |
472ad383 | 251 | sa = hash_get(pim->msdp.sa_hash, sa, hash_alloc_intern); |
472ad383 | 252 | listnode_add_sort(pim->msdp.sa_list, sa); |
3c72d654 | 253 | |
d62a17ae | 254 | if (PIM_DEBUG_MSDP_EVENTS) { |
255 | zlog_debug("MSDP SA %s created", sa->sg_str); | |
256 | } | |
3c72d654 | 257 | |
d62a17ae | 258 | return sa; |
3c72d654 | 259 | } |
260 | ||
472ad383 DS |
261 | static struct pim_msdp_sa *pim_msdp_sa_find(struct pim_instance *pim, |
262 | struct prefix_sg *sg) | |
3c72d654 | 263 | { |
d62a17ae | 264 | struct pim_msdp_sa lookup; |
3c72d654 | 265 | |
d62a17ae | 266 | lookup.sg = *sg; |
472ad383 | 267 | return hash_lookup(pim->msdp.sa_hash, &lookup); |
3c72d654 | 268 | } |
269 | ||
472ad383 DS |
270 | static struct pim_msdp_sa *pim_msdp_sa_add(struct pim_instance *pim, |
271 | struct prefix_sg *sg, | |
d62a17ae | 272 | struct in_addr rp) |
3c72d654 | 273 | { |
d62a17ae | 274 | struct pim_msdp_sa *sa; |
3c72d654 | 275 | |
472ad383 | 276 | sa = pim_msdp_sa_find(pim, sg); |
d62a17ae | 277 | if (sa) { |
278 | return sa; | |
279 | } | |
3c72d654 | 280 | |
472ad383 | 281 | return pim_msdp_sa_new(pim, sg, rp); |
3c72d654 | 282 | } |
283 | ||
d62a17ae | 284 | static void pim_msdp_sa_del(struct pim_msdp_sa *sa) |
3c72d654 | 285 | { |
d62a17ae | 286 | /* this is somewhat redundant - still want to be careful not to leave |
287 | * stale upstream references */ | |
288 | pim_msdp_sa_upstream_del(sa); | |
7667c556 | 289 | |
d62a17ae | 290 | /* stop timers */ |
291 | pim_msdp_sa_state_timer_setup(sa, false /* start */); | |
3c72d654 | 292 | |
d62a17ae | 293 | /* remove the entry from various tables */ |
472ad383 DS |
294 | listnode_delete(sa->pim->msdp.sa_list, sa); |
295 | hash_release(sa->pim->msdp.sa_hash, sa); | |
3c72d654 | 296 | |
d62a17ae | 297 | if (PIM_DEBUG_MSDP_EVENTS) { |
298 | zlog_debug("MSDP SA %s deleted", sa->sg_str); | |
299 | } | |
3c72d654 | 300 | |
d62a17ae | 301 | /* free up any associated memory */ |
302 | pim_msdp_sa_free(sa); | |
3c72d654 | 303 | } |
304 | ||
d62a17ae | 305 | static void pim_msdp_sa_peer_ip_set(struct pim_msdp_sa *sa, |
306 | struct pim_msdp_peer *mp, struct in_addr rp) | |
15ad0c71 | 307 | { |
d62a17ae | 308 | struct pim_msdp_peer *old_mp; |
15ad0c71 | 309 | |
d62a17ae | 310 | /* optimize the "no change" case as it will happen |
311 | * frequently/periodically */ | |
312 | if (mp && (sa->peer.s_addr == mp->peer.s_addr)) { | |
313 | return; | |
314 | } | |
15ad0c71 | 315 | |
d62a17ae | 316 | /* any time the peer ip changes also update the rp address */ |
317 | if (PIM_INADDR_ISNOT_ANY(sa->peer)) { | |
472ad383 | 318 | old_mp = pim_msdp_peer_find(sa->pim, sa->peer); |
d62a17ae | 319 | if (old_mp && old_mp->sa_cnt) { |
320 | --old_mp->sa_cnt; | |
321 | } | |
322 | } | |
15ad0c71 | 323 | |
d62a17ae | 324 | if (mp) { |
325 | ++mp->sa_cnt; | |
326 | sa->peer = mp->peer; | |
327 | } else { | |
328 | sa->peer.s_addr = PIM_NET_INADDR_ANY; | |
329 | } | |
330 | sa->rp = rp; | |
15ad0c71 | 331 | } |
332 | ||
3c72d654 | 333 | /* When a local active-source is removed there is no way to withdraw the |
334 | * source from peers. We will simply remove it from the SA cache so it will | |
335 | * not be sent in supsequent SA updates. Peers will consequently timeout the | |
336 | * SA. | |
337 | * Similarly a "peer-added" SA is never explicitly deleted. It is simply | |
d62a17ae | 338 | * aged out overtime if not seen in the SA updates from the peers. |
3c72d654 | 339 | * XXX: should we provide a knob to drop entries learnt from a peer when the |
340 | * peer goes down? */ | |
d62a17ae | 341 | static void pim_msdp_sa_deref(struct pim_msdp_sa *sa, |
342 | enum pim_msdp_sa_flags flags) | |
343 | { | |
344 | bool update_up = false; | |
345 | ||
346 | if ((sa->flags & PIM_MSDP_SAF_LOCAL)) { | |
347 | if (flags & PIM_MSDP_SAF_LOCAL) { | |
348 | if (PIM_DEBUG_MSDP_EVENTS) { | |
349 | zlog_debug("MSDP SA %s local reference removed", | |
350 | sa->sg_str); | |
351 | } | |
472ad383 DS |
352 | if (sa->pim->msdp.local_cnt) |
353 | --sa->pim->msdp.local_cnt; | |
d62a17ae | 354 | } |
355 | } | |
356 | ||
357 | if ((sa->flags & PIM_MSDP_SAF_PEER)) { | |
358 | if (flags & PIM_MSDP_SAF_PEER) { | |
359 | struct in_addr rp; | |
360 | ||
361 | if (PIM_DEBUG_MSDP_EVENTS) { | |
362 | zlog_debug("MSDP SA %s peer reference removed", | |
363 | sa->sg_str); | |
364 | } | |
365 | pim_msdp_sa_state_timer_setup(sa, false /* start */); | |
366 | rp.s_addr = INADDR_ANY; | |
367 | pim_msdp_sa_peer_ip_set(sa, NULL /* mp */, rp); | |
368 | /* if peer ref was removed we need to remove the msdp | |
369 | * reference on the | |
370 | * msdp entry */ | |
371 | update_up = true; | |
372 | } | |
373 | } | |
374 | ||
375 | sa->flags &= ~flags; | |
376 | if (update_up) { | |
377 | pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, "sa-deref"); | |
378 | } | |
379 | ||
380 | if (!(sa->flags & PIM_MSDP_SAF_REF)) { | |
381 | pim_msdp_sa_del(sa); | |
382 | } | |
383 | } | |
384 | ||
472ad383 DS |
385 | void pim_msdp_sa_ref(struct pim_instance *pim, struct pim_msdp_peer *mp, |
386 | struct prefix_sg *sg, struct in_addr rp) | |
d62a17ae | 387 | { |
388 | struct pim_msdp_sa *sa; | |
389 | ||
472ad383 | 390 | sa = pim_msdp_sa_add(pim, sg, rp); |
d62a17ae | 391 | if (!sa) { |
392 | return; | |
393 | } | |
394 | ||
395 | /* reference it */ | |
396 | if (mp) { | |
397 | if (!(sa->flags & PIM_MSDP_SAF_PEER)) { | |
398 | sa->flags |= PIM_MSDP_SAF_PEER; | |
399 | if (PIM_DEBUG_MSDP_EVENTS) { | |
400 | zlog_debug("MSDP SA %s added by peer", | |
401 | sa->sg_str); | |
402 | } | |
403 | } | |
404 | pim_msdp_sa_peer_ip_set(sa, mp, rp); | |
405 | /* start/re-start the state timer to prevent cache expiry */ | |
406 | pim_msdp_sa_state_timer_setup(sa, true /* start */); | |
407 | /* We re-evaluate SA "SPT-trigger" everytime we hear abt it from | |
408 | * a | |
409 | * peer. XXX: If this becomes too much of a periodic overhead we | |
410 | * can make it event based */ | |
411 | pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, "peer-ref"); | |
412 | } else { | |
413 | if (!(sa->flags & PIM_MSDP_SAF_LOCAL)) { | |
414 | sa->flags |= PIM_MSDP_SAF_LOCAL; | |
472ad383 | 415 | ++sa->pim->msdp.local_cnt; |
d62a17ae | 416 | if (PIM_DEBUG_MSDP_EVENTS) { |
417 | zlog_debug("MSDP SA %s added locally", | |
418 | sa->sg_str); | |
419 | } | |
420 | /* send an immediate SA update to peers */ | |
421 | pim_msdp_pkt_sa_tx_one(sa); | |
422 | } | |
423 | sa->flags &= ~PIM_MSDP_SAF_STALE; | |
424 | } | |
3c72d654 | 425 | } |
426 | ||
1bf16443 | 427 | /* The following criteria must be met to originate an SA from the MSDP |
428 | * speaker - | |
429 | * 1. KAT must be running i.e. source is active. | |
430 | * 2. We must be RP for the group. | |
431 | * 3. Source must be registrable to the RP (this is where the RFC is vague | |
432 | * and especially ambiguous in CLOS networks; with anycast RP all sources | |
433 | * are potentially registrable to all RPs in the domain). We assume #3 is | |
434 | * satisfied if - | |
435 | * a. We are also the FHR-DR for the source (OR) | |
436 | * b. We rxed a pim register (null or data encapsulated) within the last | |
437 | * (3 * (1.5 * register_suppression_timer))). | |
438 | */ | |
d62a17ae | 439 | static bool pim_msdp_sa_local_add_ok(struct pim_upstream *up) |
3c72d654 | 440 | { |
472ad383 DS |
441 | struct pim_instance *pim = up->channel_oil->pim; |
442 | ||
443 | if (!(pim->msdp.flags & PIM_MSDPF_ENABLE)) { | |
d62a17ae | 444 | return false; |
445 | } | |
3c72d654 | 446 | |
d62a17ae | 447 | if (!up->t_ka_timer) { |
448 | /* stream is not active */ | |
449 | return false; | |
450 | } | |
1bf16443 | 451 | |
472ad383 | 452 | if (!I_am_RP(pim, up->sg.grp)) { |
d62a17ae | 453 | /* we are not RP for the group */ |
454 | return false; | |
455 | } | |
1bf16443 | 456 | |
d62a17ae | 457 | /* we are the FHR-DR for this stream or we are RP and have seen |
458 | * registers | |
459 | * from a FHR for this source */ | |
460 | if (PIM_UPSTREAM_FLAG_TEST_FHR(up->flags) || up->t_msdp_reg_timer) { | |
461 | return true; | |
462 | } | |
1bf16443 | 463 | |
d62a17ae | 464 | return false; |
1bf16443 | 465 | } |
466 | ||
472ad383 DS |
467 | static void pim_msdp_sa_local_add(struct pim_instance *pim, |
468 | struct prefix_sg *sg) | |
1bf16443 | 469 | { |
d62a17ae | 470 | struct in_addr rp; |
471 | rp.s_addr = 0; | |
472ad383 | 472 | pim_msdp_sa_ref(pim, NULL /* mp */, sg, rp); |
3c72d654 | 473 | } |
474 | ||
472ad383 | 475 | void pim_msdp_sa_local_del(struct pim_instance *pim, struct prefix_sg *sg) |
3c72d654 | 476 | { |
d62a17ae | 477 | struct pim_msdp_sa *sa; |
3c72d654 | 478 | |
472ad383 | 479 | sa = pim_msdp_sa_find(pim, sg); |
d62a17ae | 480 | if (sa) { |
481 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); | |
482 | } | |
3c72d654 | 483 | } |
484 | ||
36e466fe | 485 | /* we need to be very cautious with this API as SA del too can trigger an |
486 | * upstream del and we will get stuck in a simple loop */ | |
472ad383 DS |
487 | static void pim_msdp_sa_local_del_on_up_del(struct pim_instance *pim, |
488 | struct prefix_sg *sg) | |
d62a17ae | 489 | { |
490 | struct pim_msdp_sa *sa; | |
491 | ||
472ad383 | 492 | sa = pim_msdp_sa_find(pim, sg); |
d62a17ae | 493 | if (sa) { |
494 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
495 | zlog_debug("MSDP local sa %s del on up del", | |
496 | sa->sg_str); | |
497 | } | |
498 | ||
499 | /* if there is no local reference escape */ | |
500 | if (!(sa->flags & PIM_MSDP_SAF_LOCAL)) { | |
501 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
502 | zlog_debug("MSDP local sa %s del; no local ref", | |
503 | sa->sg_str); | |
504 | } | |
505 | return; | |
506 | } | |
507 | ||
508 | if (sa->flags & PIM_MSDP_SAF_UP_DEL_IN_PROG) { | |
509 | /* MSDP is the one that triggered the upstream del. if | |
510 | * this happens | |
511 | * we most certainly have a bug in the PIM upstream | |
512 | * state machine. We | |
513 | * will not have a local reference unless the KAT is | |
514 | * running. And if the | |
515 | * KAT is running there MUST be an additional | |
516 | * source-stream reference to | |
517 | * the flow. Accounting for such cases requires lot of | |
518 | * changes; perhaps | |
519 | * address this in the next release? - XXX */ | |
520 | zlog_err( | |
521 | "MSDP sa %s SPT teardown is causing the local entry to be removed", | |
522 | sa->sg_str); | |
523 | return; | |
524 | } | |
525 | ||
526 | /* we are dropping the sa on upstream del we should not have an | |
527 | * upstream reference */ | |
528 | if (sa->up) { | |
529 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
530 | zlog_debug("MSDP local sa %s del; up non-NULL", | |
531 | sa->sg_str); | |
532 | } | |
533 | sa->up = NULL; | |
534 | } | |
535 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); | |
536 | } | |
36e466fe | 537 | } |
538 | ||
1bf16443 | 539 | /* Local SA qualification needs to be re-evaluated when - |
540 | * 1. KAT is started or stopped | |
541 | * 2. on RP changes | |
542 | * 3. Whenever FHR status changes for a (S,G) - XXX - currently there | |
543 | * is no clear path to transition an entry out of "MASK_FHR" need | |
544 | * to discuss this with Donald. May result in some strangeness if the | |
545 | * FHR is also the RP. | |
546 | * 4. When msdp_reg timer is started or stopped | |
547 | */ | |
d62a17ae | 548 | void pim_msdp_sa_local_update(struct pim_upstream *up) |
1bf16443 | 549 | { |
472ad383 DS |
550 | struct pim_instance *pim = up->channel_oil->pim; |
551 | ||
d62a17ae | 552 | if (pim_msdp_sa_local_add_ok(up)) { |
472ad383 | 553 | pim_msdp_sa_local_add(pim, &up->sg); |
d62a17ae | 554 | } else { |
472ad383 | 555 | pim_msdp_sa_local_del(pim, &up->sg); |
d62a17ae | 556 | } |
1bf16443 | 557 | } |
558 | ||
472ad383 | 559 | static void pim_msdp_sa_local_setup(struct pim_instance *pim) |
3c72d654 | 560 | { |
d62a17ae | 561 | struct pim_upstream *up; |
562 | struct listnode *up_node; | |
3c72d654 | 563 | |
472ad383 | 564 | for (ALL_LIST_ELEMENTS_RO(pim->upstream_list, up_node, up)) { |
d62a17ae | 565 | pim_msdp_sa_local_update(up); |
566 | } | |
3c72d654 | 567 | } |
568 | ||
7667c556 | 569 | /* whenever the RP changes we need to re-evaluate the "local" SA-cache */ |
570 | /* XXX: needs to be tested */ | |
472ad383 | 571 | void pim_msdp_i_am_rp_changed(struct pim_instance *pim) |
d62a17ae | 572 | { |
573 | struct listnode *sanode; | |
574 | struct listnode *nextnode; | |
575 | struct pim_msdp_sa *sa; | |
576 | ||
472ad383 | 577 | if (!(pim->msdp.flags & PIM_MSDPF_ENABLE)) { |
d62a17ae | 578 | /* if the feature is not enabled do nothing */ |
579 | return; | |
580 | } | |
581 | ||
582 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
583 | zlog_debug("MSDP i_am_rp changed"); | |
584 | } | |
585 | ||
586 | /* mark all local entries as stale */ | |
472ad383 | 587 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { |
d62a17ae | 588 | if (sa->flags & PIM_MSDP_SAF_LOCAL) { |
589 | sa->flags |= PIM_MSDP_SAF_STALE; | |
590 | } | |
591 | } | |
592 | ||
593 | /* re-setup local SA entries */ | |
472ad383 | 594 | pim_msdp_sa_local_setup(pim); |
d62a17ae | 595 | |
472ad383 | 596 | for (ALL_LIST_ELEMENTS(pim->msdp.sa_list, sanode, nextnode, sa)) { |
d62a17ae | 597 | /* purge stale SA entries */ |
598 | if (sa->flags & PIM_MSDP_SAF_STALE) { | |
599 | /* clear the stale flag; the entry may be kept even | |
600 | * after | |
601 | * "local-deref" */ | |
602 | sa->flags &= ~PIM_MSDP_SAF_STALE; | |
603 | /* sa_deref can end up freeing the sa; so don't access | |
604 | * contents after */ | |
605 | pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); | |
606 | } else { | |
607 | /* if the souce is still active check if we can | |
608 | * influence SPT */ | |
609 | pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, | |
610 | "rp-change"); | |
611 | } | |
612 | } | |
7667c556 | 613 | } |
614 | ||
615 | /* We track the join state of (*, G) entries. If G has sources in the SA-cache | |
616 | * we need to setup or teardown SPT when the JoinDesired status changes for | |
617 | * (*, G) */ | |
1eca8576 DS |
618 | void pim_msdp_up_join_state_changed(struct pim_instance *pim, |
619 | struct pim_upstream *xg_up) | |
d62a17ae | 620 | { |
621 | struct listnode *sanode; | |
622 | struct pim_msdp_sa *sa; | |
623 | ||
624 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
625 | zlog_debug("MSDP join state changed for %s", xg_up->sg_str); | |
626 | } | |
627 | ||
628 | /* If this is not really an XG entry just move on */ | |
629 | if ((xg_up->sg.src.s_addr != INADDR_ANY) | |
630 | || (xg_up->sg.grp.s_addr == INADDR_ANY)) { | |
631 | return; | |
632 | } | |
633 | ||
634 | /* XXX: Need to maintain SAs per-group to avoid all this unnecessary | |
635 | * walking */ | |
472ad383 | 636 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { |
d62a17ae | 637 | if (sa->sg.grp.s_addr != xg_up->sg.grp.s_addr) { |
638 | continue; | |
639 | } | |
640 | pim_msdp_sa_upstream_update(sa, xg_up, "up-jp-change"); | |
641 | } | |
642 | } | |
643 | ||
472ad383 | 644 | static void pim_msdp_up_xg_del(struct pim_instance *pim, struct prefix_sg *sg) |
d62a17ae | 645 | { |
646 | struct listnode *sanode; | |
647 | struct pim_msdp_sa *sa; | |
648 | ||
649 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
650 | zlog_debug("MSDP %s del", pim_str_sg_dump(sg)); | |
651 | } | |
652 | ||
653 | /* If this is not really an XG entry just move on */ | |
654 | if ((sg->src.s_addr != INADDR_ANY) || (sg->grp.s_addr == INADDR_ANY)) { | |
655 | return; | |
656 | } | |
657 | ||
658 | /* XXX: Need to maintain SAs per-group to avoid all this unnecessary | |
659 | * walking */ | |
472ad383 | 660 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { |
d62a17ae | 661 | if (sa->sg.grp.s_addr != sg->grp.s_addr) { |
662 | continue; | |
663 | } | |
664 | pim_msdp_sa_upstream_update(sa, NULL /* xg */, "up-jp-change"); | |
665 | } | |
666 | } | |
667 | ||
472ad383 | 668 | void pim_msdp_up_del(struct pim_instance *pim, struct prefix_sg *sg) |
d62a17ae | 669 | { |
670 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
671 | zlog_debug("MSDP up %s del", pim_str_sg_dump(sg)); | |
672 | } | |
673 | if (sg->src.s_addr == INADDR_ANY) { | |
472ad383 | 674 | pim_msdp_up_xg_del(pim, sg); |
d62a17ae | 675 | } else { |
472ad383 | 676 | pim_msdp_sa_local_del_on_up_del(pim, sg); |
d62a17ae | 677 | } |
36e466fe | 678 | } |
679 | ||
3c72d654 | 680 | /* sa hash and peer list helpers */ |
d62a17ae | 681 | static unsigned int pim_msdp_sa_hash_key_make(void *p) |
3c72d654 | 682 | { |
d62a17ae | 683 | struct pim_msdp_sa *sa = p; |
3c72d654 | 684 | |
d62a17ae | 685 | return (jhash_2words(sa->sg.src.s_addr, sa->sg.grp.s_addr, 0)); |
3c72d654 | 686 | } |
687 | ||
d62a17ae | 688 | static int pim_msdp_sa_hash_eq(const void *p1, const void *p2) |
3c72d654 | 689 | { |
d62a17ae | 690 | const struct pim_msdp_sa *sa1 = p1; |
691 | const struct pim_msdp_sa *sa2 = p2; | |
3c72d654 | 692 | |
d62a17ae | 693 | return ((sa1->sg.src.s_addr == sa2->sg.src.s_addr) |
694 | && (sa1->sg.grp.s_addr == sa2->sg.grp.s_addr)); | |
3c72d654 | 695 | } |
696 | ||
d62a17ae | 697 | static int pim_msdp_sa_comp(const void *p1, const void *p2) |
3c72d654 | 698 | { |
d62a17ae | 699 | const struct pim_msdp_sa *sa1 = p1; |
700 | const struct pim_msdp_sa *sa2 = p2; | |
3c72d654 | 701 | |
d62a17ae | 702 | if (ntohl(sa1->sg.grp.s_addr) < ntohl(sa2->sg.grp.s_addr)) |
703 | return -1; | |
3c72d654 | 704 | |
d62a17ae | 705 | if (ntohl(sa1->sg.grp.s_addr) > ntohl(sa2->sg.grp.s_addr)) |
706 | return 1; | |
3c72d654 | 707 | |
d62a17ae | 708 | if (ntohl(sa1->sg.src.s_addr) < ntohl(sa2->sg.src.s_addr)) |
709 | return -1; | |
3c72d654 | 710 | |
d62a17ae | 711 | if (ntohl(sa1->sg.src.s_addr) > ntohl(sa2->sg.src.s_addr)) |
712 | return 1; | |
3c72d654 | 713 | |
d62a17ae | 714 | return 0; |
3c72d654 | 715 | } |
716 | ||
717 | /* RFC-3618:Sec-10.1.3 - Peer-RPF forwarding */ | |
718 | /* XXX: this can use a bit of refining and extensions */ | |
d62a17ae | 719 | bool pim_msdp_peer_rpf_check(struct pim_msdp_peer *mp, struct in_addr rp) |
3c72d654 | 720 | { |
d62a17ae | 721 | if (mp->peer.s_addr == rp.s_addr) { |
722 | return true; | |
723 | } | |
3c72d654 | 724 | |
d62a17ae | 725 | return false; |
3c72d654 | 726 | } |
d62a17ae | 727 | |
3c72d654 | 728 | /************************ Peer session management **************************/ |
d62a17ae | 729 | char *pim_msdp_state_dump(enum pim_msdp_peer_state state, char *buf, |
730 | int buf_size) | |
731 | { | |
732 | switch (state) { | |
733 | case PIM_MSDP_DISABLED: | |
734 | snprintf(buf, buf_size, "%s", "disabled"); | |
735 | break; | |
736 | case PIM_MSDP_INACTIVE: | |
737 | snprintf(buf, buf_size, "%s", "inactive"); | |
738 | break; | |
739 | case PIM_MSDP_LISTEN: | |
740 | snprintf(buf, buf_size, "%s", "listen"); | |
741 | break; | |
742 | case PIM_MSDP_CONNECTING: | |
743 | snprintf(buf, buf_size, "%s", "connecting"); | |
744 | break; | |
745 | case PIM_MSDP_ESTABLISHED: | |
746 | snprintf(buf, buf_size, "%s", "established"); | |
747 | break; | |
748 | default: | |
749 | snprintf(buf, buf_size, "unk-%d", state); | |
750 | } | |
751 | return buf; | |
752 | } | |
753 | ||
754 | char *pim_msdp_peer_key_dump(struct pim_msdp_peer *mp, char *buf, int buf_size, | |
755 | bool long_format) | |
756 | { | |
757 | char peer_str[INET_ADDRSTRLEN]; | |
758 | char local_str[INET_ADDRSTRLEN]; | |
759 | ||
760 | pim_inet4_dump("<peer?>", mp->peer, peer_str, sizeof(peer_str)); | |
761 | if (long_format) { | |
762 | pim_inet4_dump("<local?>", mp->local, local_str, | |
763 | sizeof(local_str)); | |
764 | snprintf(buf, buf_size, "MSDP peer %s local %s mg %s", peer_str, | |
765 | local_str, mp->mesh_group_name); | |
766 | } else { | |
767 | snprintf(buf, buf_size, "MSDP peer %s", peer_str); | |
768 | } | |
769 | ||
770 | return buf; | |
771 | } | |
772 | ||
773 | static void pim_msdp_peer_state_chg_log(struct pim_msdp_peer *mp) | |
774 | { | |
775 | char state_str[PIM_MSDP_STATE_STRLEN]; | |
776 | ||
777 | pim_msdp_state_dump(mp->state, state_str, sizeof(state_str)); | |
778 | zlog_debug("MSDP peer %s state chg to %s", mp->key_str, state_str); | |
2a333e0f | 779 | } |
780 | ||
781 | /* MSDP Connection State Machine actions (defined in RFC-3618:Sec-11.2) */ | |
782 | /* 11.2.A2: active peer - start connect retry timer; when the timer fires | |
783 | * a tcp connection will be made */ | |
d62a17ae | 784 | static void pim_msdp_peer_connect(struct pim_msdp_peer *mp) |
2a333e0f | 785 | { |
d62a17ae | 786 | mp->state = PIM_MSDP_CONNECTING; |
787 | if (PIM_DEBUG_MSDP_EVENTS) { | |
788 | pim_msdp_peer_state_chg_log(mp); | |
789 | } | |
2a333e0f | 790 | |
d62a17ae | 791 | pim_msdp_peer_cr_timer_setup(mp, true /* start */); |
2a333e0f | 792 | } |
793 | ||
794 | /* 11.2.A3: passive peer - just listen for connections */ | |
d62a17ae | 795 | static void pim_msdp_peer_listen(struct pim_msdp_peer *mp) |
2a333e0f | 796 | { |
d62a17ae | 797 | mp->state = PIM_MSDP_LISTEN; |
798 | if (PIM_DEBUG_MSDP_EVENTS) { | |
799 | pim_msdp_peer_state_chg_log(mp); | |
800 | } | |
2a333e0f | 801 | |
d62a17ae | 802 | /* this is interntionally asymmetric i.e. we set up listen-socket when |
9d303b37 DL |
803 | * the |
804 | * first listening peer is configured; but don't bother tearing it down | |
805 | * when | |
806 | * all the peers go down */ | |
472ad383 | 807 | pim_msdp_sock_listen(mp->pim); |
2a333e0f | 808 | } |
809 | ||
810 | /* 11.2.A4 and 11.2.A5: transition active or passive peer to | |
811 | * established state */ | |
d62a17ae | 812 | void pim_msdp_peer_established(struct pim_msdp_peer *mp) |
2a333e0f | 813 | { |
d62a17ae | 814 | if (mp->state != PIM_MSDP_ESTABLISHED) { |
815 | ++mp->est_flaps; | |
816 | } | |
977d71cc | 817 | |
d62a17ae | 818 | mp->state = PIM_MSDP_ESTABLISHED; |
819 | mp->uptime = pim_time_monotonic_sec(); | |
2a333e0f | 820 | |
d62a17ae | 821 | if (PIM_DEBUG_MSDP_EVENTS) { |
822 | pim_msdp_peer_state_chg_log(mp); | |
823 | } | |
2a333e0f | 824 | |
d62a17ae | 825 | /* stop retry timer on active peers */ |
826 | pim_msdp_peer_cr_timer_setup(mp, false /* start */); | |
2a333e0f | 827 | |
d62a17ae | 828 | /* send KA; start KA and hold timers */ |
829 | pim_msdp_pkt_ka_tx(mp); | |
830 | pim_msdp_peer_ka_timer_setup(mp, true /* start */); | |
831 | pim_msdp_peer_hold_timer_setup(mp, true /* start */); | |
2a333e0f | 832 | |
d62a17ae | 833 | pim_msdp_pkt_sa_tx_to_one_peer(mp); |
3c72d654 | 834 | |
d62a17ae | 835 | PIM_MSDP_PEER_WRITE_ON(mp); |
836 | PIM_MSDP_PEER_READ_ON(mp); | |
2a333e0f | 837 | } |
838 | ||
839 | /* 11.2.A6, 11.2.A7 and 11.2.A8: shutdown the peer tcp connection */ | |
d62a17ae | 840 | void pim_msdp_peer_stop_tcp_conn(struct pim_msdp_peer *mp, bool chg_state) |
841 | { | |
842 | if (chg_state) { | |
843 | if (mp->state == PIM_MSDP_ESTABLISHED) { | |
844 | ++mp->est_flaps; | |
845 | } | |
846 | mp->state = PIM_MSDP_INACTIVE; | |
847 | if (PIM_DEBUG_MSDP_EVENTS) { | |
848 | pim_msdp_peer_state_chg_log(mp); | |
849 | } | |
850 | } | |
851 | ||
852 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
853 | zlog_debug("MSDP peer %s pim_msdp_peer_stop_tcp_conn", | |
854 | mp->key_str); | |
855 | } | |
856 | /* stop read and write threads */ | |
857 | PIM_MSDP_PEER_READ_OFF(mp); | |
858 | PIM_MSDP_PEER_WRITE_OFF(mp); | |
859 | ||
860 | /* reset buffers */ | |
861 | mp->packet_size = 0; | |
862 | if (mp->ibuf) | |
863 | stream_reset(mp->ibuf); | |
864 | if (mp->obuf) | |
865 | stream_fifo_clean(mp->obuf); | |
866 | ||
867 | /* stop all peer timers */ | |
868 | pim_msdp_peer_ka_timer_setup(mp, false /* start */); | |
869 | pim_msdp_peer_cr_timer_setup(mp, false /* start */); | |
870 | pim_msdp_peer_hold_timer_setup(mp, false /* start */); | |
871 | ||
872 | /* close connection */ | |
873 | if (mp->fd >= 0) { | |
874 | close(mp->fd); | |
875 | mp->fd = -1; | |
876 | } | |
2a333e0f | 877 | } |
878 | ||
879 | /* RFC-3618:Sec-5.6 - stop the peer tcp connection and startover */ | |
d62a17ae | 880 | void pim_msdp_peer_reset_tcp_conn(struct pim_msdp_peer *mp, const char *rc_str) |
2a333e0f | 881 | { |
d62a17ae | 882 | if (PIM_DEBUG_EVENTS) { |
883 | zlog_debug("MSDP peer %s tcp reset %s", mp->key_str, rc_str); | |
884 | snprintf(mp->last_reset, sizeof(mp->last_reset), "%s", rc_str); | |
885 | } | |
2a333e0f | 886 | |
d62a17ae | 887 | /* close the connection and transition to listening or connecting */ |
888 | pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */); | |
889 | if (PIM_MSDP_PEER_IS_LISTENER(mp)) { | |
890 | pim_msdp_peer_listen(mp); | |
891 | } else { | |
892 | pim_msdp_peer_connect(mp); | |
893 | } | |
2a333e0f | 894 | } |
895 | ||
d62a17ae | 896 | static void pim_msdp_peer_timer_expiry_log(struct pim_msdp_peer *mp, |
897 | const char *timer_str) | |
2a333e0f | 898 | { |
d62a17ae | 899 | zlog_debug("MSDP peer %s %s timer expired", mp->key_str, timer_str); |
2a333e0f | 900 | } |
901 | ||
902 | /* RFC-3618:Sec-5.4 - peer hold timer */ | |
d62a17ae | 903 | static int pim_msdp_peer_hold_timer_cb(struct thread *t) |
2a333e0f | 904 | { |
d62a17ae | 905 | struct pim_msdp_peer *mp; |
2a333e0f | 906 | |
d62a17ae | 907 | mp = THREAD_ARG(t); |
2a333e0f | 908 | |
d62a17ae | 909 | if (PIM_DEBUG_MSDP_EVENTS) { |
910 | pim_msdp_peer_timer_expiry_log(mp, "hold"); | |
911 | } | |
2a333e0f | 912 | |
d62a17ae | 913 | if (mp->state != PIM_MSDP_ESTABLISHED) { |
914 | return 0; | |
915 | } | |
2a333e0f | 916 | |
d62a17ae | 917 | if (PIM_DEBUG_MSDP_EVENTS) { |
918 | pim_msdp_peer_state_chg_log(mp); | |
919 | } | |
920 | pim_msdp_peer_reset_tcp_conn(mp, "ht-expired"); | |
921 | return 0; | |
2a333e0f | 922 | } |
472ad383 | 923 | |
d62a17ae | 924 | static void pim_msdp_peer_hold_timer_setup(struct pim_msdp_peer *mp, bool start) |
2a333e0f | 925 | { |
472ad383 | 926 | struct pim_instance *pim = mp->pim; |
d62a17ae | 927 | THREAD_OFF(mp->hold_timer); |
928 | if (start) { | |
472ad383 | 929 | thread_add_timer(pim->msdp.master, pim_msdp_peer_hold_timer_cb, |
2ad78035 | 930 | mp, PIM_MSDP_PEER_HOLD_TIME, &mp->hold_timer); |
d62a17ae | 931 | } |
2a333e0f | 932 | } |
933 | ||
934 | ||
935 | /* RFC-3618:Sec-5.5 - peer keepalive timer */ | |
d62a17ae | 936 | static int pim_msdp_peer_ka_timer_cb(struct thread *t) |
2a333e0f | 937 | { |
d62a17ae | 938 | struct pim_msdp_peer *mp; |
2a333e0f | 939 | |
d62a17ae | 940 | mp = THREAD_ARG(t); |
2a333e0f | 941 | |
d62a17ae | 942 | if (PIM_DEBUG_MSDP_EVENTS) { |
943 | pim_msdp_peer_timer_expiry_log(mp, "ka"); | |
944 | } | |
2a333e0f | 945 | |
d62a17ae | 946 | pim_msdp_pkt_ka_tx(mp); |
947 | pim_msdp_peer_ka_timer_setup(mp, true /* start */); | |
948 | return 0; | |
2a333e0f | 949 | } |
d62a17ae | 950 | static void pim_msdp_peer_ka_timer_setup(struct pim_msdp_peer *mp, bool start) |
2a333e0f | 951 | { |
d62a17ae | 952 | THREAD_OFF(mp->ka_timer); |
953 | if (start) { | |
472ad383 DS |
954 | thread_add_timer(mp->pim->msdp.master, |
955 | pim_msdp_peer_ka_timer_cb, mp, | |
956 | PIM_MSDP_PEER_KA_TIME, &mp->ka_timer); | |
d62a17ae | 957 | } |
2a333e0f | 958 | } |
959 | ||
d62a17ae | 960 | static void pim_msdp_peer_active_connect(struct pim_msdp_peer *mp) |
2a333e0f | 961 | { |
d62a17ae | 962 | int rc; |
963 | ++mp->conn_attempts; | |
964 | rc = pim_msdp_sock_connect(mp); | |
2a333e0f | 965 | |
d62a17ae | 966 | if (PIM_DEBUG_MSDP_INTERNAL) { |
967 | zlog_debug("MSDP peer %s pim_msdp_peer_active_connect: %d", | |
968 | mp->key_str, rc); | |
969 | } | |
2a333e0f | 970 | |
d62a17ae | 971 | switch (rc) { |
972 | case connect_error: | |
973 | case -1: | |
974 | /* connect failed restart the connect-retry timer */ | |
975 | pim_msdp_peer_cr_timer_setup(mp, true /* start */); | |
976 | break; | |
2a333e0f | 977 | |
d62a17ae | 978 | case connect_success: |
979 | /* connect was sucessful move to established */ | |
980 | pim_msdp_peer_established(mp); | |
981 | break; | |
2a333e0f | 982 | |
d62a17ae | 983 | case connect_in_progress: |
984 | /* for NB content we need to wait till sock is readable or | |
985 | * writeable */ | |
986 | PIM_MSDP_PEER_WRITE_ON(mp); | |
987 | PIM_MSDP_PEER_READ_ON(mp); | |
988 | /* also restart connect-retry timer to reset the socket if | |
989 | * connect is | |
990 | * not sucessful */ | |
991 | pim_msdp_peer_cr_timer_setup(mp, true /* start */); | |
992 | break; | |
993 | } | |
2a333e0f | 994 | } |
995 | ||
996 | /* RFC-3618:Sec-5.6 - connection retry on active peer */ | |
d62a17ae | 997 | static int pim_msdp_peer_cr_timer_cb(struct thread *t) |
2a333e0f | 998 | { |
d62a17ae | 999 | struct pim_msdp_peer *mp; |
2a333e0f | 1000 | |
d62a17ae | 1001 | mp = THREAD_ARG(t); |
2a333e0f | 1002 | |
d62a17ae | 1003 | if (PIM_DEBUG_MSDP_EVENTS) { |
1004 | pim_msdp_peer_timer_expiry_log(mp, "connect-retry"); | |
1005 | } | |
2a333e0f | 1006 | |
d62a17ae | 1007 | if (mp->state != PIM_MSDP_CONNECTING || PIM_MSDP_PEER_IS_LISTENER(mp)) { |
1008 | return 0; | |
1009 | } | |
2a333e0f | 1010 | |
d62a17ae | 1011 | pim_msdp_peer_active_connect(mp); |
1012 | return 0; | |
2a333e0f | 1013 | } |
d62a17ae | 1014 | static void pim_msdp_peer_cr_timer_setup(struct pim_msdp_peer *mp, bool start) |
2a333e0f | 1015 | { |
d62a17ae | 1016 | THREAD_OFF(mp->cr_timer); |
1017 | if (start) { | |
472ad383 DS |
1018 | thread_add_timer( |
1019 | mp->pim->msdp.master, pim_msdp_peer_cr_timer_cb, mp, | |
1020 | PIM_MSDP_PEER_CONNECT_RETRY_TIME, &mp->cr_timer); | |
d62a17ae | 1021 | } |
2a333e0f | 1022 | } |
1023 | ||
1024 | /* if a valid packet is rxed from the peer we can restart hold timer */ | |
d62a17ae | 1025 | void pim_msdp_peer_pkt_rxed(struct pim_msdp_peer *mp) |
2a333e0f | 1026 | { |
d62a17ae | 1027 | if (mp->state == PIM_MSDP_ESTABLISHED) { |
1028 | pim_msdp_peer_hold_timer_setup(mp, true /* start */); | |
1029 | } | |
2a333e0f | 1030 | } |
1031 | ||
3c72d654 | 1032 | /* if a valid packet is txed to the peer we can restart ka timer and avoid |
1033 | * unnecessary ka noise in the network */ | |
d62a17ae | 1034 | void pim_msdp_peer_pkt_txed(struct pim_msdp_peer *mp) |
3c72d654 | 1035 | { |
d62a17ae | 1036 | if (mp->state == PIM_MSDP_ESTABLISHED) { |
1037 | pim_msdp_peer_ka_timer_setup(mp, true /* start */); | |
1038 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
1039 | zlog_debug("MSDP ka timer restart on pkt tx to %s", | |
1040 | mp->key_str); | |
1041 | } | |
1042 | } | |
3c72d654 | 1043 | } |
1044 | ||
2a333e0f | 1045 | static void pim_msdp_addr2su(union sockunion *su, struct in_addr addr) |
1046 | { | |
d62a17ae | 1047 | sockunion_init(su); |
1048 | su->sin.sin_addr = addr; | |
1049 | su->sin.sin_family = AF_INET; | |
2a333e0f | 1050 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 1051 | su->sin.sin_len = sizeof(struct sockaddr_in); |
2a333e0f | 1052 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
1053 | } | |
1054 | ||
1055 | /* 11.2.A1: create a new peer and transition state to listen or connecting */ | |
472ad383 DS |
1056 | static enum pim_msdp_err pim_msdp_peer_new(struct pim_instance *pim, |
1057 | struct in_addr peer_addr, | |
d62a17ae | 1058 | struct in_addr local_addr, |
1059 | const char *mesh_group_name, | |
1060 | struct pim_msdp_peer **mp_p) | |
1061 | { | |
1062 | struct pim_msdp_peer *mp; | |
1063 | ||
472ad383 | 1064 | pim_msdp_enable(pim); |
d62a17ae | 1065 | |
1066 | mp = XCALLOC(MTYPE_PIM_MSDP_PEER, sizeof(*mp)); | |
d62a17ae | 1067 | |
472ad383 | 1068 | mp->pim = pim; |
d62a17ae | 1069 | mp->peer = peer_addr; |
1070 | pim_inet4_dump("<peer?>", mp->peer, mp->key_str, sizeof(mp->key_str)); | |
1071 | pim_msdp_addr2su(&mp->su_peer, mp->peer); | |
1072 | mp->local = local_addr; | |
1073 | /* XXX: originator_id setting needs to move to the mesh group */ | |
472ad383 | 1074 | pim->msdp.originator_id = local_addr; |
d62a17ae | 1075 | pim_msdp_addr2su(&mp->su_local, mp->local); |
1076 | mp->mesh_group_name = XSTRDUP(MTYPE_PIM_MSDP_MG_NAME, mesh_group_name); | |
1077 | mp->state = PIM_MSDP_INACTIVE; | |
1078 | mp->fd = -1; | |
1079 | strcpy(mp->last_reset, "-"); | |
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 | ||
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 */ | |
472ad383 DS |
1090 | mp = hash_get(pim->msdp.peer_hash, mp, hash_alloc_intern); |
1091 | listnode_add_sort(pim->msdp.peer_list, mp); | |
d62a17ae | 1092 | |
1093 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1094 | zlog_debug("MSDP peer %s created", mp->key_str); | |
1095 | ||
1096 | pim_msdp_peer_state_chg_log(mp); | |
1097 | } | |
1098 | ||
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 | } | |
1105 | if (mp_p) { | |
1106 | *mp_p = mp; | |
1107 | } | |
1108 | return PIM_MSDP_ERR_NONE; | |
1109 | } | |
1110 | ||
472ad383 DS |
1111 | struct pim_msdp_peer *pim_msdp_peer_find(struct pim_instance *pim, |
1112 | struct in_addr peer_addr) | |
d62a17ae | 1113 | { |
1114 | struct pim_msdp_peer lookup; | |
1115 | ||
1116 | lookup.peer = peer_addr; | |
472ad383 | 1117 | return hash_lookup(pim->msdp.peer_hash, &lookup); |
2a333e0f | 1118 | } |
1119 | ||
1120 | /* add peer configuration if it doesn't already exist */ | |
472ad383 DS |
1121 | enum pim_msdp_err pim_msdp_peer_add(struct pim_instance *pim, |
1122 | struct in_addr peer_addr, | |
d62a17ae | 1123 | struct in_addr local_addr, |
1124 | const char *mesh_group_name, | |
1125 | struct pim_msdp_peer **mp_p) | |
2a333e0f | 1126 | { |
d62a17ae | 1127 | struct pim_msdp_peer *mp; |
2a333e0f | 1128 | |
d62a17ae | 1129 | if (mp_p) { |
1130 | *mp_p = NULL; | |
1131 | } | |
977d71cc | 1132 | |
d62a17ae | 1133 | if (peer_addr.s_addr == local_addr.s_addr) { |
1134 | /* skip session setup if config is invalid */ | |
1135 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1136 | char peer_str[INET_ADDRSTRLEN]; | |
977d71cc | 1137 | |
d62a17ae | 1138 | pim_inet4_dump("<peer?>", peer_addr, peer_str, |
1139 | sizeof(peer_str)); | |
1140 | zlog_debug("%s add skipped as DIP=SIP", peer_str); | |
1141 | } | |
1142 | return PIM_MSDP_ERR_SIP_EQ_DIP; | |
1143 | } | |
977d71cc | 1144 | |
472ad383 | 1145 | mp = pim_msdp_peer_find(pim, peer_addr); |
d62a17ae | 1146 | if (mp) { |
1147 | if (mp_p) { | |
1148 | *mp_p = mp; | |
1149 | } | |
1150 | return PIM_MSDP_ERR_PEER_EXISTS; | |
1151 | } | |
2a333e0f | 1152 | |
472ad383 DS |
1153 | return pim_msdp_peer_new(pim, peer_addr, local_addr, mesh_group_name, |
1154 | mp_p); | |
2a333e0f | 1155 | } |
1156 | ||
1157 | /* release all mem associated with a peer */ | |
d62a17ae | 1158 | static void pim_msdp_peer_free(struct pim_msdp_peer *mp) |
11128587 | 1159 | { |
ec2f0e53 DS |
1160 | /* |
1161 | * Let's make sure we are not running when we delete | |
1162 | * the underlying data structure | |
1163 | */ | |
845d9af7 | 1164 | pim_msdp_peer_stop_tcp_conn(mp, false); |
ec2f0e53 | 1165 | |
d62a17ae | 1166 | if (mp->ibuf) { |
1167 | stream_free(mp->ibuf); | |
1168 | } | |
2a333e0f | 1169 | |
d62a17ae | 1170 | if (mp->obuf) { |
1171 | stream_fifo_free(mp->obuf); | |
1172 | } | |
2a333e0f | 1173 | |
d62a17ae | 1174 | if (mp->mesh_group_name) { |
1175 | XFREE(MTYPE_PIM_MSDP_MG_NAME, mp->mesh_group_name); | |
1176 | } | |
845d9af7 DS |
1177 | |
1178 | mp->pim = NULL; | |
d62a17ae | 1179 | XFREE(MTYPE_PIM_MSDP_PEER, mp); |
2a333e0f | 1180 | } |
1181 | ||
1182 | /* delete the peer config */ | |
d62a17ae | 1183 | static enum pim_msdp_err pim_msdp_peer_do_del(struct pim_msdp_peer *mp) |
2a333e0f | 1184 | { |
d62a17ae | 1185 | /* stop the tcp connection and shutdown all timers */ |
1186 | pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */); | |
2a333e0f | 1187 | |
d62a17ae | 1188 | /* remove the session from various tables */ |
472ad383 DS |
1189 | listnode_delete(mp->pim->msdp.peer_list, mp); |
1190 | hash_release(mp->pim->msdp.peer_hash, mp); | |
2a333e0f | 1191 | |
d62a17ae | 1192 | if (PIM_DEBUG_MSDP_EVENTS) { |
1193 | zlog_debug("MSDP peer %s deleted", mp->key_str); | |
1194 | } | |
2a333e0f | 1195 | |
d62a17ae | 1196 | /* free up any associated memory */ |
1197 | pim_msdp_peer_free(mp); | |
2a333e0f | 1198 | |
d62a17ae | 1199 | return PIM_MSDP_ERR_NONE; |
2a333e0f | 1200 | } |
1201 | ||
472ad383 DS |
1202 | enum pim_msdp_err pim_msdp_peer_del(struct pim_instance *pim, |
1203 | struct in_addr peer_addr) | |
977d71cc | 1204 | { |
d62a17ae | 1205 | struct pim_msdp_peer *mp; |
977d71cc | 1206 | |
472ad383 | 1207 | mp = pim_msdp_peer_find(pim, peer_addr); |
d62a17ae | 1208 | if (!mp) { |
1209 | return PIM_MSDP_ERR_NO_PEER; | |
1210 | } | |
977d71cc | 1211 | |
d62a17ae | 1212 | return pim_msdp_peer_do_del(mp); |
977d71cc | 1213 | } |
1214 | ||
2a333e0f | 1215 | /* peer hash and peer list helpers */ |
d62a17ae | 1216 | static unsigned int pim_msdp_peer_hash_key_make(void *p) |
2a333e0f | 1217 | { |
d62a17ae | 1218 | struct pim_msdp_peer *mp = p; |
1219 | return (jhash_1word(mp->peer.s_addr, 0)); | |
2a333e0f | 1220 | } |
1221 | ||
d62a17ae | 1222 | static int pim_msdp_peer_hash_eq(const void *p1, const void *p2) |
2a333e0f | 1223 | { |
d62a17ae | 1224 | const struct pim_msdp_peer *mp1 = p1; |
1225 | const struct pim_msdp_peer *mp2 = p2; | |
2a333e0f | 1226 | |
d62a17ae | 1227 | return (mp1->peer.s_addr == mp2->peer.s_addr); |
2a333e0f | 1228 | } |
1229 | ||
d62a17ae | 1230 | static int pim_msdp_peer_comp(const void *p1, const void *p2) |
2a333e0f | 1231 | { |
d62a17ae | 1232 | const struct pim_msdp_peer *mp1 = p1; |
1233 | const struct pim_msdp_peer *mp2 = p2; | |
2a333e0f | 1234 | |
d62a17ae | 1235 | if (ntohl(mp1->peer.s_addr) < ntohl(mp2->peer.s_addr)) |
1236 | return -1; | |
2a333e0f | 1237 | |
d62a17ae | 1238 | if (ntohl(mp1->peer.s_addr) > ntohl(mp2->peer.s_addr)) |
1239 | return 1; | |
2a333e0f | 1240 | |
d62a17ae | 1241 | return 0; |
2a333e0f | 1242 | } |
1243 | ||
977d71cc | 1244 | /************************** Mesh group management **************************/ |
472ad383 | 1245 | static void pim_msdp_mg_free(struct pim_instance *pim, struct pim_msdp_mg *mg) |
977d71cc | 1246 | { |
d62a17ae | 1247 | /* If the mesh-group has valid member or src_ip don't delete it */ |
1248 | if (!mg || mg->mbr_cnt || (mg->src_ip.s_addr != INADDR_ANY)) { | |
1249 | return; | |
1250 | } | |
977d71cc | 1251 | |
d62a17ae | 1252 | if (PIM_DEBUG_MSDP_EVENTS) { |
1253 | zlog_debug("MSDP mesh-group %s deleted", mg->mesh_group_name); | |
1254 | } | |
1255 | if (mg->mesh_group_name) | |
1256 | XFREE(MTYPE_PIM_MSDP_MG_NAME, mg->mesh_group_name); | |
977d71cc | 1257 | |
d62a17ae | 1258 | if (mg->mbr_list) |
affe9e99 | 1259 | list_delete_and_null(&mg->mbr_list); |
b9b1e1f2 | 1260 | |
d62a17ae | 1261 | XFREE(MTYPE_PIM_MSDP_MG, mg); |
472ad383 | 1262 | pim->msdp.mg = NULL; |
977d71cc | 1263 | } |
1264 | ||
d62a17ae | 1265 | static struct pim_msdp_mg *pim_msdp_mg_new(const char *mesh_group_name) |
977d71cc | 1266 | { |
d62a17ae | 1267 | struct pim_msdp_mg *mg; |
977d71cc | 1268 | |
d62a17ae | 1269 | mg = XCALLOC(MTYPE_PIM_MSDP_MG, sizeof(*mg)); |
977d71cc | 1270 | |
d62a17ae | 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; | |
977d71cc | 1275 | |
d62a17ae | 1276 | if (PIM_DEBUG_MSDP_EVENTS) { |
1277 | zlog_debug("MSDP mesh-group %s created", mg->mesh_group_name); | |
1278 | } | |
1279 | return mg; | |
977d71cc | 1280 | } |
1281 | ||
472ad383 DS |
1282 | enum pim_msdp_err pim_msdp_mg_del(struct pim_instance *pim, |
1283 | const char *mesh_group_name) | |
977d71cc | 1284 | { |
472ad383 | 1285 | struct pim_msdp_mg *mg = pim->msdp.mg; |
d62a17ae | 1286 | struct pim_msdp_mg_mbr *mbr; |
977d71cc | 1287 | |
d62a17ae | 1288 | if (!mg || strcmp(mg->mesh_group_name, mesh_group_name)) { |
1289 | return PIM_MSDP_ERR_NO_MG; | |
1290 | } | |
977d71cc | 1291 | |
d62a17ae | 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 | } | |
977d71cc | 1297 | |
d62a17ae | 1298 | /* clear src ip */ |
1299 | mg->src_ip.s_addr = INADDR_ANY; | |
977d71cc | 1300 | |
d62a17ae | 1301 | /* free up the mesh-group */ |
472ad383 | 1302 | pim_msdp_mg_free(pim, mg); |
d62a17ae | 1303 | return PIM_MSDP_ERR_NONE; |
977d71cc | 1304 | } |
1305 | ||
472ad383 DS |
1306 | static enum pim_msdp_err pim_msdp_mg_add(struct pim_instance *pim, |
1307 | const char *mesh_group_name) | |
977d71cc | 1308 | { |
472ad383 DS |
1309 | if (pim->msdp.mg) { |
1310 | if (!strcmp(pim->msdp.mg->mesh_group_name, mesh_group_name)) { | |
d62a17ae | 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 | } | |
977d71cc | 1316 | |
472ad383 DS |
1317 | pim->msdp.mg = pim_msdp_mg_new(mesh_group_name); |
1318 | if (!pim->msdp.mg) { | |
d62a17ae | 1319 | return PIM_MSDP_ERR_OOM; |
1320 | } | |
977d71cc | 1321 | |
d62a17ae | 1322 | return PIM_MSDP_ERR_NONE; |
977d71cc | 1323 | } |
1324 | ||
d62a17ae | 1325 | static int pim_msdp_mg_mbr_comp(const void *p1, const void *p2) |
977d71cc | 1326 | { |
d62a17ae | 1327 | const struct pim_msdp_mg_mbr *mbr1 = p1; |
1328 | const struct pim_msdp_mg_mbr *mbr2 = p2; | |
977d71cc | 1329 | |
d62a17ae | 1330 | if (ntohl(mbr1->mbr_ip.s_addr) < ntohl(mbr2->mbr_ip.s_addr)) |
1331 | return -1; | |
977d71cc | 1332 | |
d62a17ae | 1333 | if (ntohl(mbr1->mbr_ip.s_addr) > ntohl(mbr2->mbr_ip.s_addr)) |
1334 | return 1; | |
977d71cc | 1335 | |
d62a17ae | 1336 | return 0; |
977d71cc | 1337 | } |
1338 | ||
d62a17ae | 1339 | static void pim_msdp_mg_mbr_free(struct pim_msdp_mg_mbr *mbr) |
977d71cc | 1340 | { |
d62a17ae | 1341 | XFREE(MTYPE_PIM_MSDP_MG_MBR, mbr); |
977d71cc | 1342 | } |
1343 | ||
472ad383 DS |
1344 | static struct pim_msdp_mg_mbr *pim_msdp_mg_mbr_find(struct pim_instance *pim, |
1345 | struct in_addr mbr_ip) | |
977d71cc | 1346 | { |
d62a17ae | 1347 | struct pim_msdp_mg_mbr *mbr; |
1348 | struct listnode *mbr_node; | |
977d71cc | 1349 | |
472ad383 | 1350 | if (!pim->msdp.mg) { |
d62a17ae | 1351 | return NULL; |
1352 | } | |
1353 | /* we can move this to a hash but considering that number of peers in | |
1354 | * a mesh-group that seems like bit of an overkill */ | |
472ad383 | 1355 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.mg->mbr_list, mbr_node, mbr)) { |
d62a17ae | 1356 | if (mbr->mbr_ip.s_addr == mbr_ip.s_addr) { |
1357 | return mbr; | |
1358 | } | |
1359 | } | |
1360 | return mbr; | |
977d71cc | 1361 | } |
1362 | ||
472ad383 DS |
1363 | enum pim_msdp_err pim_msdp_mg_mbr_add(struct pim_instance *pim, |
1364 | const char *mesh_group_name, | |
d62a17ae | 1365 | struct in_addr mbr_ip) |
977d71cc | 1366 | { |
d62a17ae | 1367 | int rc; |
1368 | struct pim_msdp_mg_mbr *mbr; | |
1369 | struct pim_msdp_mg *mg; | |
977d71cc | 1370 | |
472ad383 | 1371 | rc = pim_msdp_mg_add(pim, mesh_group_name); |
d62a17ae | 1372 | if (rc != PIM_MSDP_ERR_NONE) { |
1373 | return rc; | |
1374 | } | |
977d71cc | 1375 | |
472ad383 DS |
1376 | mg = pim->msdp.mg; |
1377 | mbr = pim_msdp_mg_mbr_find(pim, mbr_ip); | |
d62a17ae | 1378 | if (mbr) { |
1379 | return PIM_MSDP_ERR_MG_MBR_EXISTS; | |
1380 | } | |
977d71cc | 1381 | |
d62a17ae | 1382 | mbr = XCALLOC(MTYPE_PIM_MSDP_MG_MBR, sizeof(*mbr)); |
d62a17ae | 1383 | mbr->mbr_ip = mbr_ip; |
1384 | listnode_add_sort(mg->mbr_list, mbr); | |
977d71cc | 1385 | |
d62a17ae | 1386 | /* if valid SIP has been configured add peer session */ |
1387 | if (mg->src_ip.s_addr != INADDR_ANY) { | |
472ad383 | 1388 | pim_msdp_peer_add(pim, mbr_ip, mg->src_ip, mesh_group_name, |
d62a17ae | 1389 | &mbr->mp); |
1390 | } | |
977d71cc | 1391 | |
d62a17ae | 1392 | if (PIM_DEBUG_MSDP_EVENTS) { |
1393 | char ip_str[INET_ADDRSTRLEN]; | |
1394 | pim_inet4_dump("<mbr?>", mbr->mbr_ip, ip_str, sizeof(ip_str)); | |
1395 | zlog_debug("MSDP mesh-group %s mbr %s created", | |
1396 | mg->mesh_group_name, ip_str); | |
1397 | } | |
1398 | ++mg->mbr_cnt; | |
1399 | return PIM_MSDP_ERR_NONE; | |
977d71cc | 1400 | } |
1401 | ||
d62a17ae | 1402 | static void pim_msdp_mg_mbr_do_del(struct pim_msdp_mg *mg, |
1403 | struct pim_msdp_mg_mbr *mbr) | |
977d71cc | 1404 | { |
d62a17ae | 1405 | /* Delete active peer session if any */ |
1406 | if (mbr->mp) { | |
1407 | pim_msdp_peer_do_del(mbr->mp); | |
1408 | } | |
977d71cc | 1409 | |
d62a17ae | 1410 | listnode_delete(mg->mbr_list, mbr); |
1411 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1412 | char ip_str[INET_ADDRSTRLEN]; | |
1413 | pim_inet4_dump("<mbr?>", mbr->mbr_ip, ip_str, sizeof(ip_str)); | |
1414 | zlog_debug("MSDP mesh-group %s mbr %s deleted", | |
1415 | mg->mesh_group_name, ip_str); | |
1416 | } | |
1417 | pim_msdp_mg_mbr_free(mbr); | |
1418 | if (mg->mbr_cnt) { | |
1419 | --mg->mbr_cnt; | |
1420 | } | |
977d71cc | 1421 | } |
1422 | ||
472ad383 DS |
1423 | enum pim_msdp_err pim_msdp_mg_mbr_del(struct pim_instance *pim, |
1424 | const char *mesh_group_name, | |
d62a17ae | 1425 | struct in_addr mbr_ip) |
1426 | { | |
1427 | struct pim_msdp_mg_mbr *mbr; | |
472ad383 | 1428 | struct pim_msdp_mg *mg = pim->msdp.mg; |
d62a17ae | 1429 | |
1430 | if (!mg || strcmp(mg->mesh_group_name, mesh_group_name)) { | |
1431 | return PIM_MSDP_ERR_NO_MG; | |
1432 | } | |
1433 | ||
472ad383 | 1434 | mbr = pim_msdp_mg_mbr_find(pim, mbr_ip); |
d62a17ae | 1435 | if (!mbr) { |
1436 | return PIM_MSDP_ERR_NO_MG_MBR; | |
1437 | } | |
1438 | ||
1439 | pim_msdp_mg_mbr_do_del(mg, mbr); | |
1440 | /* if there are no references to the mg free it */ | |
472ad383 | 1441 | pim_msdp_mg_free(pim, mg); |
d62a17ae | 1442 | |
1443 | return PIM_MSDP_ERR_NONE; | |
1444 | } | |
1445 | ||
472ad383 | 1446 | static void pim_msdp_mg_src_do_del(struct pim_instance *pim) |
d62a17ae | 1447 | { |
1448 | struct pim_msdp_mg_mbr *mbr; | |
1449 | struct listnode *mbr_node; | |
472ad383 | 1450 | struct pim_msdp_mg *mg = pim->msdp.mg; |
d62a17ae | 1451 | |
1452 | /* SIP is being removed - tear down all active peer sessions */ | |
1453 | for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbr_node, mbr)) { | |
1454 | if (mbr->mp) { | |
1455 | pim_msdp_peer_do_del(mbr->mp); | |
1456 | mbr->mp = NULL; | |
1457 | } | |
1458 | } | |
1459 | if (PIM_DEBUG_MSDP_EVENTS) { | |
1460 | zlog_debug("MSDP mesh-group %s src cleared", | |
1461 | mg->mesh_group_name); | |
1462 | } | |
1463 | } | |
1464 | ||
472ad383 DS |
1465 | enum pim_msdp_err pim_msdp_mg_src_del(struct pim_instance *pim, |
1466 | const char *mesh_group_name) | |
d62a17ae | 1467 | { |
472ad383 | 1468 | struct pim_msdp_mg *mg = pim->msdp.mg; |
d62a17ae | 1469 | |
1470 | if (!mg || strcmp(mg->mesh_group_name, mesh_group_name)) { | |
1471 | return PIM_MSDP_ERR_NO_MG; | |
1472 | } | |
1473 | ||
1474 | if (mg->src_ip.s_addr != INADDR_ANY) { | |
1475 | mg->src_ip.s_addr = INADDR_ANY; | |
472ad383 | 1476 | pim_msdp_mg_src_do_del(pim); |
d62a17ae | 1477 | /* if there are no references to the mg free it */ |
472ad383 | 1478 | pim_msdp_mg_free(pim, mg); |
d62a17ae | 1479 | } |
1480 | return PIM_MSDP_ERR_NONE; | |
1481 | } | |
1482 | ||
472ad383 DS |
1483 | enum pim_msdp_err pim_msdp_mg_src_add(struct pim_instance *pim, |
1484 | const char *mesh_group_name, | |
d62a17ae | 1485 | struct in_addr src_ip) |
1486 | { | |
1487 | int rc; | |
1488 | struct pim_msdp_mg_mbr *mbr; | |
1489 | struct listnode *mbr_node; | |
1490 | struct pim_msdp_mg *mg; | |
1491 | ||
1492 | if (src_ip.s_addr == INADDR_ANY) { | |
472ad383 | 1493 | pim_msdp_mg_src_del(pim, mesh_group_name); |
d62a17ae | 1494 | return PIM_MSDP_ERR_NONE; |
1495 | } | |
1496 | ||
472ad383 | 1497 | rc = pim_msdp_mg_add(pim, mesh_group_name); |
d62a17ae | 1498 | if (rc != PIM_MSDP_ERR_NONE) { |
1499 | return rc; | |
1500 | } | |
1501 | ||
472ad383 | 1502 | mg = pim->msdp.mg; |
d62a17ae | 1503 | if (mg->src_ip.s_addr != INADDR_ANY) { |
472ad383 | 1504 | pim_msdp_mg_src_do_del(pim); |
d62a17ae | 1505 | } |
1506 | mg->src_ip = src_ip; | |
977d71cc | 1507 | |
d62a17ae | 1508 | for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbr_node, mbr)) { |
472ad383 | 1509 | pim_msdp_peer_add(pim, mbr->mbr_ip, mg->src_ip, mesh_group_name, |
d62a17ae | 1510 | &mbr->mp); |
1511 | } | |
977d71cc | 1512 | |
d62a17ae | 1513 | if (PIM_DEBUG_MSDP_EVENTS) { |
1514 | char ip_str[INET_ADDRSTRLEN]; | |
1515 | pim_inet4_dump("<src?>", mg->src_ip, ip_str, sizeof(ip_str)); | |
1516 | zlog_debug("MSDP mesh-group %s src %s set", mg->mesh_group_name, | |
1517 | ip_str); | |
1518 | } | |
1519 | return PIM_MSDP_ERR_NONE; | |
977d71cc | 1520 | } |
1521 | ||
3c72d654 | 1522 | /*********************** MSDP feature APIs *********************************/ |
c9657fdc DS |
1523 | int pim_msdp_config_write_helper(struct pim_instance *pim, struct vty *vty, |
1524 | const char *spaces) | |
d62a17ae | 1525 | { |
1526 | struct listnode *mbrnode; | |
1527 | struct pim_msdp_mg_mbr *mbr; | |
472ad383 | 1528 | struct pim_msdp_mg *mg = pim->msdp.mg; |
d62a17ae | 1529 | char mbr_str[INET_ADDRSTRLEN]; |
1530 | char src_str[INET_ADDRSTRLEN]; | |
1531 | int count = 0; | |
1532 | ||
1533 | if (!mg) { | |
1534 | return count; | |
1535 | } | |
1536 | ||
1537 | if (mg->src_ip.s_addr != INADDR_ANY) { | |
1538 | pim_inet4_dump("<src?>", mg->src_ip, src_str, sizeof(src_str)); | |
c9657fdc | 1539 | vty_out(vty, "%sip msdp mesh-group %s source %s\n", spaces, |
d62a17ae | 1540 | mg->mesh_group_name, src_str); |
1541 | ++count; | |
1542 | } | |
1543 | ||
1544 | for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbrnode, mbr)) { | |
1545 | pim_inet4_dump("<mbr?>", mbr->mbr_ip, mbr_str, sizeof(mbr_str)); | |
c9657fdc | 1546 | vty_out(vty, "%sip msdp mesh-group %s member %s\n", spaces, |
d62a17ae | 1547 | mg->mesh_group_name, mbr_str); |
1548 | ++count; | |
1549 | } | |
1550 | return count; | |
3c72d654 | 1551 | } |
1552 | ||
472ad383 DS |
1553 | int pim_msdp_config_write(struct vty *vty) |
1554 | { | |
c9657fdc | 1555 | return pim_msdp_config_write_helper(pimg, vty, ""); |
472ad383 DS |
1556 | } |
1557 | ||
3c72d654 | 1558 | /* Enable feature including active/periodic timers etc. on the first peer |
1559 | * config. Till then MSDP should just stay quiet. */ | |
472ad383 | 1560 | static void pim_msdp_enable(struct pim_instance *pim) |
3c72d654 | 1561 | { |
472ad383 | 1562 | if (pim->msdp.flags & PIM_MSDPF_ENABLE) { |
d62a17ae | 1563 | /* feature is already enabled */ |
1564 | return; | |
1565 | } | |
472ad383 DS |
1566 | pim->msdp.flags |= PIM_MSDPF_ENABLE; |
1567 | pim->msdp.work_obuf = stream_new(PIM_MSDP_MAX_PACKET_SIZE); | |
1568 | pim_msdp_sa_adv_timer_setup(pim, true /* start */); | |
d62a17ae | 1569 | /* setup sa cache based on local sources */ |
472ad383 | 1570 | pim_msdp_sa_local_setup(pim); |
3c72d654 | 1571 | } |
1572 | ||
2a333e0f | 1573 | /* MSDP init */ |
64c86530 | 1574 | void pim_msdp_init(struct pim_instance *pim, struct thread_master *master) |
2a333e0f | 1575 | { |
472ad383 | 1576 | pim->msdp.master = master; |
9fb302f4 | 1577 | char hash_name[64]; |
3c72d654 | 1578 | |
9fb302f4 | 1579 | snprintf(hash_name, 64, "PIM %s MSDP Peer Hash", pim->vrf->name); |
2ad78035 | 1580 | pim->msdp.peer_hash = hash_create(pim_msdp_peer_hash_key_make, |
9fb302f4 | 1581 | pim_msdp_peer_hash_eq, hash_name); |
2ad78035 DS |
1582 | pim->msdp.peer_list = list_new(); |
1583 | pim->msdp.peer_list->del = (void (*)(void *))pim_msdp_peer_free; | |
1584 | pim->msdp.peer_list->cmp = (int (*)(void *, void *))pim_msdp_peer_comp; | |
3c72d654 | 1585 | |
9fb302f4 | 1586 | snprintf(hash_name, 64, "PIM %s MSDP SA Hash", pim->vrf->name); |
2ad78035 | 1587 | pim->msdp.sa_hash = hash_create(pim_msdp_sa_hash_key_make, |
9fb302f4 | 1588 | pim_msdp_sa_hash_eq, hash_name); |
2ad78035 DS |
1589 | pim->msdp.sa_list = list_new(); |
1590 | pim->msdp.sa_list->del = (void (*)(void *))pim_msdp_sa_free; | |
1591 | pim->msdp.sa_list->cmp = (int (*)(void *, void *))pim_msdp_sa_comp; | |
2a333e0f | 1592 | } |
1593 | ||
1594 | /* counterpart to MSDP init; XXX: unused currently */ | |
2ad78035 | 1595 | void pim_msdp_exit(struct pim_instance *pim) |
2a333e0f | 1596 | { |
ec2f0e53 DS |
1597 | pim_msdp_sa_adv_timer_setup(pim, false); |
1598 | ||
d62a17ae | 1599 | /* XXX: stop listener and delete all peer sessions */ |
2a333e0f | 1600 | |
2ad78035 | 1601 | if (pim->msdp.peer_hash) { |
36ef2c10 | 1602 | hash_clean(pim->msdp.peer_hash, NULL); |
2ad78035 DS |
1603 | hash_free(pim->msdp.peer_hash); |
1604 | pim->msdp.peer_hash = NULL; | |
d62a17ae | 1605 | } |
2a333e0f | 1606 | |
2ad78035 | 1607 | if (pim->msdp.peer_list) { |
affe9e99 | 1608 | list_delete_and_null(&pim->msdp.peer_list); |
d62a17ae | 1609 | } |
3da8a099 DS |
1610 | |
1611 | if (pim->msdp.sa_hash) { | |
36ef2c10 | 1612 | hash_clean(pim->msdp.sa_hash, NULL); |
3da8a099 DS |
1613 | hash_free(pim->msdp.sa_hash); |
1614 | pim->msdp.sa_hash = NULL; | |
1615 | } | |
1616 | ||
1617 | if (pim->msdp.sa_list) { | |
affe9e99 | 1618 | list_delete_and_null(&pim->msdp.sa_list); |
3da8a099 | 1619 | } |
36ef2c10 DS |
1620 | |
1621 | if (pim->msdp.work_obuf) | |
1622 | stream_free(pim->msdp.work_obuf); | |
1623 | pim->msdp.work_obuf = NULL; | |
11128587 | 1624 | } |