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12e41d03 DL |
1 | /* |
2 | PIM for Quagga | |
3 | Copyright (C) 2008 Everton da Silva Marques | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, but | |
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; see the file COPYING; if not, write to the | |
17 | Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
18 | MA 02110-1301 USA | |
19 | ||
12e41d03 DL |
20 | */ |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include "zebra/rib.h" | |
25 | ||
26 | #include "log.h" | |
27 | #include "zclient.h" | |
28 | #include "memory.h" | |
29 | #include "thread.h" | |
30 | #include "linklist.h" | |
31 | ||
32 | #include "pimd.h" | |
33 | #include "pim_pim.h" | |
34 | #include "pim_str.h" | |
35 | #include "pim_time.h" | |
36 | #include "pim_iface.h" | |
37 | #include "pim_join.h" | |
38 | #include "pim_zlookup.h" | |
39 | #include "pim_upstream.h" | |
40 | #include "pim_ifchannel.h" | |
41 | #include "pim_neighbor.h" | |
42 | #include "pim_rpf.h" | |
43 | #include "pim_zebra.h" | |
44 | #include "pim_oil.h" | |
45 | #include "pim_macro.h" | |
8f5f5e91 | 46 | #include "pim_rp.h" |
f14248dd | 47 | #include "pim_br.h" |
627ed2a3 | 48 | #include "pim_register.h" |
12e41d03 DL |
49 | |
50 | static void join_timer_start(struct pim_upstream *up); | |
51 | static void pim_upstream_update_assert_tracking_desired(struct pim_upstream *up); | |
52 | ||
4d99418b DS |
53 | /* |
54 | * If we have a (*,*) || (S,*) there is no parent | |
55 | * If we have a (S,G), find the (*,G) | |
56 | * If we have a (*,G), find the (*,*) | |
57 | */ | |
58 | static struct pim_upstream * | |
59 | pim_upstream_find_parent (struct prefix *sg) | |
60 | { | |
61 | struct prefix any = *sg; | |
62 | ||
63 | // (*,*) || (S,*) | |
64 | if (((sg->u.sg.src.s_addr == INADDR_ANY) && | |
65 | (sg->u.sg.grp.s_addr == INADDR_ANY)) || | |
66 | ((sg->u.sg.src.s_addr != INADDR_ANY) && | |
67 | (sg->u.sg.grp.s_addr == INADDR_ANY))) | |
68 | return NULL; | |
69 | ||
70 | // (S,G) | |
71 | if ((sg->u.sg.src.s_addr != INADDR_ANY) && | |
72 | (sg->u.sg.grp.s_addr != INADDR_ANY)) | |
73 | { | |
74 | any.u.sg.src.s_addr = INADDR_ANY; | |
75 | return pim_upstream_find (&any); | |
76 | } | |
77 | ||
78 | // (*,G) | |
79 | any.u.sg.grp.s_addr = INADDR_ANY; | |
80 | return pim_upstream_find (&any); | |
81 | } | |
82 | ||
12e41d03 DL |
83 | void pim_upstream_free(struct pim_upstream *up) |
84 | { | |
85 | XFREE(MTYPE_PIM_UPSTREAM, up); | |
86 | } | |
87 | ||
88 | static void upstream_channel_oil_detach(struct pim_upstream *up) | |
89 | { | |
90 | if (up->channel_oil) { | |
91 | pim_channel_oil_del(up->channel_oil); | |
25a335e0 | 92 | up->channel_oil = NULL; |
12e41d03 DL |
93 | } |
94 | } | |
95 | ||
96 | void pim_upstream_delete(struct pim_upstream *up) | |
97 | { | |
98 | THREAD_OFF(up->t_join_timer); | |
f14248dd | 99 | THREAD_OFF(up->t_ka_timer); |
792f4d29 | 100 | THREAD_OFF(up->t_rs_timer); |
12e41d03 DL |
101 | |
102 | upstream_channel_oil_detach(up); | |
103 | ||
104 | /* | |
105 | notice that listnode_delete() can't be moved | |
106 | into pim_upstream_free() because the later is | |
107 | called by list_delete_all_node() | |
108 | */ | |
109 | listnode_delete(qpim_upstream_list, up); | |
110 | ||
111 | pim_upstream_free(up); | |
112 | } | |
113 | ||
56638739 DS |
114 | void |
115 | pim_upstream_send_join (struct pim_upstream *up) | |
12e41d03 | 116 | { |
12e41d03 | 117 | if (PIM_DEBUG_PIM_TRACE) { |
56638739 | 118 | char rpf_str[100]; |
56638739 | 119 | pim_inet4_dump("<rpf?>", up->rpf.rpf_addr, rpf_str, sizeof(rpf_str)); |
05e451f8 DS |
120 | zlog_debug ("%s: RPF'%s=%s(%s) for Interface %s", __PRETTY_FUNCTION__, |
121 | pim_str_sg_dump (&up->sg), rpf_str, pim_upstream_state2str (up), | |
56638739 | 122 | up->rpf.source_nexthop.interface->name); |
12e41d03 | 123 | if (PIM_INADDR_IS_ANY(up->rpf.rpf_addr)) { |
05e451f8 | 124 | zlog_debug("%s: can't send join upstream: RPF'%s=%s", |
56638739 | 125 | __PRETTY_FUNCTION__, |
05e451f8 | 126 | pim_str_sg_dump (&up->sg), rpf_str); |
12e41d03 DL |
127 | /* warning only */ |
128 | } | |
129 | } | |
56638739 DS |
130 | |
131 | /* | |
132 | * In the case of a FHR we will not have anyone to send this to. | |
133 | */ | |
134 | if (up->fhr) | |
135 | return; | |
136 | ||
137 | zassert(up->join_state == PIM_UPSTREAM_JOINED); | |
12e41d03 DL |
138 | |
139 | /* send Join(S,G) to the current upstream neighbor */ | |
140 | pim_joinprune_send(up->rpf.source_nexthop.interface, | |
141 | up->rpf.rpf_addr, | |
05e451f8 | 142 | &up->sg, |
12e41d03 DL |
143 | 1 /* join */); |
144 | } | |
145 | ||
146 | static int on_join_timer(struct thread *t) | |
147 | { | |
148 | struct pim_upstream *up; | |
149 | ||
150 | zassert(t); | |
151 | up = THREAD_ARG(t); | |
152 | zassert(up); | |
153 | ||
56638739 | 154 | pim_upstream_send_join (up); |
12e41d03 | 155 | |
4a4c4a07 | 156 | up->t_join_timer = NULL; |
12e41d03 DL |
157 | join_timer_start(up); |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static void join_timer_start(struct pim_upstream *up) | |
163 | { | |
164 | if (PIM_DEBUG_PIM_EVENTS) { | |
05e451f8 | 165 | zlog_debug("%s: starting %d sec timer for upstream (S,G)=%s", |
12e41d03 DL |
166 | __PRETTY_FUNCTION__, |
167 | qpim_t_periodic, | |
05e451f8 | 168 | pim_str_sg_dump (&up->sg)); |
12e41d03 DL |
169 | } |
170 | ||
171 | zassert(!up->t_join_timer); | |
172 | ||
173 | THREAD_TIMER_ON(master, up->t_join_timer, | |
174 | on_join_timer, | |
175 | up, qpim_t_periodic); | |
176 | } | |
177 | ||
178 | void pim_upstream_join_timer_restart(struct pim_upstream *up) | |
179 | { | |
180 | THREAD_OFF(up->t_join_timer); | |
181 | join_timer_start(up); | |
182 | } | |
183 | ||
184 | static void pim_upstream_join_timer_restart_msec(struct pim_upstream *up, | |
185 | int interval_msec) | |
186 | { | |
187 | if (PIM_DEBUG_PIM_EVENTS) { | |
05e451f8 | 188 | zlog_debug("%s: restarting %d msec timer for upstream (S,G)=%s", |
12e41d03 DL |
189 | __PRETTY_FUNCTION__, |
190 | interval_msec, | |
05e451f8 | 191 | pim_str_sg_dump (&up->sg)); |
12e41d03 DL |
192 | } |
193 | ||
194 | THREAD_OFF(up->t_join_timer); | |
195 | THREAD_TIMER_MSEC_ON(master, up->t_join_timer, | |
196 | on_join_timer, | |
197 | up, interval_msec); | |
198 | } | |
199 | ||
200 | void pim_upstream_join_suppress(struct pim_upstream *up, | |
201 | struct in_addr rpf_addr, | |
202 | int holdtime) | |
203 | { | |
204 | long t_joinsuppress_msec; | |
205 | long join_timer_remain_msec; | |
206 | ||
207 | t_joinsuppress_msec = MIN(pim_if_t_suppressed_msec(up->rpf.source_nexthop.interface), | |
208 | 1000 * holdtime); | |
209 | ||
210 | join_timer_remain_msec = pim_time_timer_remain_msec(up->t_join_timer); | |
211 | ||
212 | if (PIM_DEBUG_PIM_TRACE) { | |
12e41d03 | 213 | char rpf_str[100]; |
12e41d03 | 214 | pim_inet4_dump("<rpf?>", rpf_addr, rpf_str, sizeof(rpf_str)); |
05e451f8 | 215 | zlog_debug("%s %s: detected Join%s to RPF'(S,G)=%s: join_timer=%ld msec t_joinsuppress=%ld msec", |
12e41d03 | 216 | __FILE__, __PRETTY_FUNCTION__, |
05e451f8 | 217 | pim_str_sg_dump (&up->sg), |
12e41d03 DL |
218 | rpf_str, |
219 | join_timer_remain_msec, t_joinsuppress_msec); | |
220 | } | |
221 | ||
222 | if (join_timer_remain_msec < t_joinsuppress_msec) { | |
223 | if (PIM_DEBUG_PIM_TRACE) { | |
05e451f8 | 224 | zlog_debug("%s %s: suppressing Join(S,G)=%s for %ld msec", |
12e41d03 | 225 | __FILE__, __PRETTY_FUNCTION__, |
05e451f8 | 226 | pim_str_sg_dump (&up->sg), t_joinsuppress_msec); |
12e41d03 DL |
227 | } |
228 | ||
229 | pim_upstream_join_timer_restart_msec(up, t_joinsuppress_msec); | |
230 | } | |
231 | } | |
232 | ||
233 | void pim_upstream_join_timer_decrease_to_t_override(const char *debug_label, | |
234 | struct pim_upstream *up, | |
235 | struct in_addr rpf_addr) | |
236 | { | |
237 | long join_timer_remain_msec; | |
238 | int t_override_msec; | |
239 | ||
240 | join_timer_remain_msec = pim_time_timer_remain_msec(up->t_join_timer); | |
241 | t_override_msec = pim_if_t_override_msec(up->rpf.source_nexthop.interface); | |
242 | ||
243 | if (PIM_DEBUG_PIM_TRACE) { | |
12e41d03 | 244 | char rpf_str[100]; |
12e41d03 | 245 | pim_inet4_dump("<rpf?>", rpf_addr, rpf_str, sizeof(rpf_str)); |
05e451f8 | 246 | zlog_debug("%s: to RPF'%s=%s: join_timer=%ld msec t_override=%d msec", |
12e41d03 | 247 | debug_label, |
05e451f8 | 248 | pim_str_sg_dump (&up->sg), rpf_str, |
12e41d03 DL |
249 | join_timer_remain_msec, t_override_msec); |
250 | } | |
251 | ||
252 | if (join_timer_remain_msec > t_override_msec) { | |
253 | if (PIM_DEBUG_PIM_TRACE) { | |
05e451f8 | 254 | zlog_debug("%s: decreasing (S,G)=%s join timer to t_override=%d msec", |
12e41d03 | 255 | debug_label, |
05e451f8 | 256 | pim_str_sg_dump (&up->sg), |
12e41d03 DL |
257 | t_override_msec); |
258 | } | |
259 | ||
260 | pim_upstream_join_timer_restart_msec(up, t_override_msec); | |
261 | } | |
262 | } | |
263 | ||
264 | static void forward_on(struct pim_upstream *up) | |
265 | { | |
266 | struct listnode *ifnode; | |
267 | struct listnode *ifnextnode; | |
268 | struct listnode *chnode; | |
269 | struct listnode *chnextnode; | |
270 | struct interface *ifp; | |
271 | struct pim_interface *pim_ifp; | |
272 | struct pim_ifchannel *ch; | |
273 | ||
274 | /* scan all interfaces */ | |
469351b3 | 275 | for (ALL_LIST_ELEMENTS (vrf_iflist (VRF_DEFAULT), ifnode, ifnextnode, ifp)) { |
12e41d03 DL |
276 | pim_ifp = ifp->info; |
277 | if (!pim_ifp) | |
278 | continue; | |
279 | ||
280 | /* scan per-interface (S,G) state */ | |
281 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_ifchannel_list, chnode, chnextnode, ch)) { | |
282 | ||
283 | if (ch->upstream != up) | |
284 | continue; | |
285 | ||
286 | if (pim_macro_chisin_oiflist(ch)) | |
287 | pim_forward_start(ch); | |
288 | ||
289 | } /* scan iface channel list */ | |
290 | } /* scan iflist */ | |
291 | } | |
292 | ||
293 | static void forward_off(struct pim_upstream *up) | |
294 | { | |
295 | struct listnode *ifnode; | |
296 | struct listnode *ifnextnode; | |
297 | struct listnode *chnode; | |
298 | struct listnode *chnextnode; | |
299 | struct interface *ifp; | |
300 | struct pim_interface *pim_ifp; | |
301 | struct pim_ifchannel *ch; | |
302 | ||
303 | /* scan all interfaces */ | |
469351b3 | 304 | for (ALL_LIST_ELEMENTS (vrf_iflist (VRF_DEFAULT), ifnode, ifnextnode, ifp)) { |
12e41d03 DL |
305 | pim_ifp = ifp->info; |
306 | if (!pim_ifp) | |
307 | continue; | |
308 | ||
309 | /* scan per-interface (S,G) state */ | |
310 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_ifchannel_list, chnode, chnextnode, ch)) { | |
311 | ||
312 | if (ch->upstream != up) | |
313 | continue; | |
314 | ||
315 | pim_forward_stop(ch); | |
316 | ||
317 | } /* scan iface channel list */ | |
318 | } /* scan iflist */ | |
319 | } | |
320 | ||
7fcdfb34 DS |
321 | void |
322 | pim_upstream_switch(struct pim_upstream *up, | |
323 | enum pim_upstream_state new_state) | |
12e41d03 DL |
324 | { |
325 | enum pim_upstream_state old_state = up->join_state; | |
326 | ||
327 | zassert(old_state != new_state); | |
328 | ||
329 | up->join_state = new_state; | |
330 | up->state_transition = pim_time_monotonic_sec(); | |
331 | ||
332 | if (PIM_DEBUG_PIM_EVENTS) { | |
05e451f8 | 333 | zlog_debug("%s: PIM_UPSTREAM_%s: (S,G)=%s", |
12e41d03 DL |
334 | __PRETTY_FUNCTION__, |
335 | ((new_state == PIM_UPSTREAM_JOINED) ? "JOINED" : "NOTJOINED"), | |
05e451f8 | 336 | pim_str_sg_dump (&up->sg)); |
12e41d03 DL |
337 | } |
338 | ||
339 | pim_upstream_update_assert_tracking_desired(up); | |
340 | ||
341 | if (new_state == PIM_UPSTREAM_JOINED) { | |
342 | forward_on(up); | |
56638739 | 343 | pim_upstream_send_join (up); |
12e41d03 DL |
344 | join_timer_start(up); |
345 | } | |
346 | else { | |
347 | forward_off(up); | |
348 | pim_joinprune_send(up->rpf.source_nexthop.interface, | |
349 | up->rpf.rpf_addr, | |
05e451f8 | 350 | &up->sg, |
12e41d03 | 351 | 0 /* prune */); |
7fcdfb34 DS |
352 | if (up->t_join_timer) |
353 | THREAD_OFF(up->t_join_timer); | |
12e41d03 | 354 | } |
12e41d03 DL |
355 | } |
356 | ||
5074a423 | 357 | static struct pim_upstream *pim_upstream_new(struct prefix *sg, |
651d0f71 | 358 | struct interface *incoming) |
12e41d03 DL |
359 | { |
360 | struct pim_upstream *up; | |
2f702571 | 361 | enum pim_rpf_result rpf_result; |
12e41d03 | 362 | |
36d9e7dc | 363 | up = XCALLOC(MTYPE_PIM_UPSTREAM, sizeof(*up)); |
12e41d03 | 364 | if (!up) { |
36d9e7dc | 365 | zlog_err("%s: PIM XCALLOC(%zu) failure", |
12e41d03 | 366 | __PRETTY_FUNCTION__, sizeof(*up)); |
8f5f5e91 | 367 | return NULL; |
12e41d03 DL |
368 | } |
369 | ||
5074a423 DS |
370 | up->sg = *sg; |
371 | if (!pim_rp_set_upstream_addr (&up->upstream_addr, sg->u.sg.src)) | |
8f5f5e91 DS |
372 | { |
373 | if (PIM_DEBUG_PIM_TRACE) | |
374 | zlog_debug("%s: Received a (*,G) with no RP configured", __PRETTY_FUNCTION__); | |
375 | ||
376 | XFREE (MTYPE_PIM_UPSTREAM, up); | |
377 | return NULL; | |
378 | } | |
379 | ||
4d99418b | 380 | up->parent = pim_upstream_find_parent (sg); |
12e41d03 DL |
381 | up->flags = 0; |
382 | up->ref_count = 1; | |
4a4c4a07 DS |
383 | up->t_join_timer = NULL; |
384 | up->t_ka_timer = NULL; | |
792f4d29 | 385 | up->t_rs_timer = NULL; |
12e41d03 DL |
386 | up->join_state = 0; |
387 | up->state_transition = pim_time_monotonic_sec(); | |
4a4c4a07 | 388 | up->channel_oil = NULL; |
f9e0ab5b | 389 | up->sptbit = PIM_UPSTREAM_SPTBIT_FALSE; |
12e41d03 DL |
390 | |
391 | up->rpf.source_nexthop.interface = 0; | |
392 | up->rpf.source_nexthop.mrib_nexthop_addr.s_addr = PIM_NET_INADDR_ANY; | |
393 | up->rpf.source_nexthop.mrib_metric_preference = qpim_infinite_assert_metric.metric_preference; | |
394 | up->rpf.source_nexthop.mrib_route_metric = qpim_infinite_assert_metric.route_metric; | |
395 | up->rpf.rpf_addr.s_addr = PIM_NET_INADDR_ANY; | |
396 | ||
651d0f71 | 397 | rpf_result = pim_rpf_update(up, 0, incoming); |
2f702571 DS |
398 | if (rpf_result == PIM_RPF_FAILURE) { |
399 | XFREE(MTYPE_PIM_UPSTREAM, up); | |
400 | return NULL; | |
401 | } | |
12e41d03 DL |
402 | |
403 | listnode_add(qpim_upstream_list, up); | |
404 | ||
405 | return up; | |
406 | } | |
407 | ||
6c629103 DS |
408 | /* |
409 | * For a given sg, find any non * source | |
410 | */ | |
411 | struct pim_upstream *pim_upstream_find_non_any (struct prefix *sg) | |
412 | { | |
413 | struct listnode *up_node; | |
414 | struct prefix any = *sg; | |
415 | struct pim_upstream *up; | |
416 | ||
417 | any.u.sg.src.s_addr = INADDR_ANY; | |
418 | ||
419 | for (ALL_LIST_ELEMENTS_RO (qpim_upstream_list, up_node, up)) | |
420 | { | |
421 | if ((any.u.sg.grp.s_addr == up->sg.u.sg.grp.s_addr) && | |
422 | (up->sg.u.sg.src.s_addr != any.u.sg.src.s_addr)) | |
423 | return up; | |
424 | } | |
425 | ||
426 | return NULL; | |
427 | } | |
428 | ||
5074a423 | 429 | struct pim_upstream *pim_upstream_find(struct prefix *sg) |
12e41d03 DL |
430 | { |
431 | struct listnode *up_node; | |
432 | struct pim_upstream *up; | |
433 | ||
434 | for (ALL_LIST_ELEMENTS_RO(qpim_upstream_list, up_node, up)) { | |
a3b58b4a DS |
435 | if ((sg->u.sg.grp.s_addr == up->sg.u.sg.grp.s_addr) && |
436 | (sg->u.sg.src.s_addr == up->sg.u.sg.src.s_addr)) | |
437 | return up; | |
12e41d03 DL |
438 | } |
439 | ||
d7259eac | 440 | return NULL; |
12e41d03 DL |
441 | } |
442 | ||
5074a423 | 443 | struct pim_upstream *pim_upstream_add(struct prefix *sg, |
651d0f71 | 444 | struct interface *incoming) |
12e41d03 DL |
445 | { |
446 | struct pim_upstream *up; | |
447 | ||
5074a423 | 448 | up = pim_upstream_find(sg); |
12e41d03 DL |
449 | if (up) { |
450 | ++up->ref_count; | |
451 | } | |
452 | else { | |
5074a423 | 453 | up = pim_upstream_new(sg, incoming); |
12e41d03 DL |
454 | } |
455 | ||
456 | return up; | |
457 | } | |
458 | ||
459 | void pim_upstream_del(struct pim_upstream *up) | |
460 | { | |
461 | --up->ref_count; | |
462 | ||
463 | if (up->ref_count < 1) { | |
464 | pim_upstream_delete(up); | |
465 | } | |
466 | } | |
467 | ||
468 | /* | |
469 | Evaluate JoinDesired(S,G): | |
470 | ||
471 | JoinDesired(S,G) is true if there is a downstream (S,G) interface I | |
472 | in the set: | |
473 | ||
474 | inherited_olist(S,G) = | |
475 | joins(S,G) (+) pim_include(S,G) (-) lost_assert(S,G) | |
476 | ||
477 | JoinDesired(S,G) may be affected by changes in the following: | |
478 | ||
479 | pim_ifp->primary_address | |
480 | pim_ifp->pim_dr_addr | |
481 | ch->ifassert_winner_metric | |
482 | ch->ifassert_winner | |
483 | ch->local_ifmembership | |
484 | ch->ifjoin_state | |
485 | ch->upstream->rpf.source_nexthop.mrib_metric_preference | |
486 | ch->upstream->rpf.source_nexthop.mrib_route_metric | |
487 | ch->upstream->rpf.source_nexthop.interface | |
488 | ||
489 | See also pim_upstream_update_join_desired() below. | |
490 | */ | |
491 | int pim_upstream_evaluate_join_desired(struct pim_upstream *up) | |
492 | { | |
493 | struct listnode *ifnode; | |
494 | struct listnode *ifnextnode; | |
495 | struct listnode *chnode; | |
496 | struct listnode *chnextnode; | |
497 | struct interface *ifp; | |
498 | struct pim_interface *pim_ifp; | |
499 | struct pim_ifchannel *ch; | |
500 | ||
501 | /* scan all interfaces */ | |
469351b3 | 502 | for (ALL_LIST_ELEMENTS (vrf_iflist (VRF_DEFAULT), ifnode, ifnextnode, ifp)) { |
12e41d03 DL |
503 | pim_ifp = ifp->info; |
504 | if (!pim_ifp) | |
505 | continue; | |
506 | ||
507 | /* scan per-interface (S,G) state */ | |
508 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_ifchannel_list, chnode, chnextnode, ch)) { | |
509 | if (ch->upstream != up) | |
510 | continue; | |
511 | ||
512 | if (pim_macro_ch_lost_assert(ch)) | |
513 | continue; /* keep searching */ | |
514 | ||
515 | if (pim_macro_chisin_joins_or_include(ch)) | |
516 | return 1; /* true */ | |
517 | } /* scan iface channel list */ | |
518 | } /* scan iflist */ | |
519 | ||
520 | return 0; /* false */ | |
521 | } | |
522 | ||
523 | /* | |
524 | See also pim_upstream_evaluate_join_desired() above. | |
525 | */ | |
526 | void pim_upstream_update_join_desired(struct pim_upstream *up) | |
527 | { | |
528 | int was_join_desired; /* boolean */ | |
529 | int is_join_desired; /* boolean */ | |
530 | ||
531 | was_join_desired = PIM_UPSTREAM_FLAG_TEST_DR_JOIN_DESIRED(up->flags); | |
532 | ||
533 | is_join_desired = pim_upstream_evaluate_join_desired(up); | |
534 | if (is_join_desired) | |
535 | PIM_UPSTREAM_FLAG_SET_DR_JOIN_DESIRED(up->flags); | |
536 | else | |
537 | PIM_UPSTREAM_FLAG_UNSET_DR_JOIN_DESIRED(up->flags); | |
538 | ||
539 | /* switched from false to true */ | |
540 | if (is_join_desired && !was_join_desired) { | |
216bb84f DS |
541 | zassert(up->join_state == PIM_UPSTREAM_NOTJOINED || |
542 | up->join_state == PIM_UPSTREAM_PRUNE); | |
12e41d03 DL |
543 | pim_upstream_switch(up, PIM_UPSTREAM_JOINED); |
544 | return; | |
545 | } | |
546 | ||
547 | /* switched from true to false */ | |
548 | if (!is_join_desired && was_join_desired) { | |
549 | zassert(up->join_state == PIM_UPSTREAM_JOINED); | |
550 | pim_upstream_switch(up, PIM_UPSTREAM_NOTJOINED); | |
551 | return; | |
552 | } | |
553 | } | |
554 | ||
555 | /* | |
556 | RFC 4601 4.5.7. Sending (S,G) Join/Prune Messages | |
557 | Transitions from Joined State | |
558 | RPF'(S,G) GenID changes | |
559 | ||
560 | The upstream (S,G) state machine remains in Joined state. If the | |
561 | Join Timer is set to expire in more than t_override seconds, reset | |
562 | it so that it expires after t_override seconds. | |
563 | */ | |
564 | void pim_upstream_rpf_genid_changed(struct in_addr neigh_addr) | |
565 | { | |
566 | struct listnode *up_node; | |
567 | struct listnode *up_nextnode; | |
568 | struct pim_upstream *up; | |
569 | ||
570 | /* | |
571 | Scan all (S,G) upstreams searching for RPF'(S,G)=neigh_addr | |
572 | */ | |
573 | for (ALL_LIST_ELEMENTS(qpim_upstream_list, up_node, up_nextnode, up)) { | |
574 | ||
575 | if (PIM_DEBUG_PIM_TRACE) { | |
576 | char neigh_str[100]; | |
12e41d03 DL |
577 | char rpf_addr_str[100]; |
578 | pim_inet4_dump("<neigh?>", neigh_addr, neigh_str, sizeof(neigh_str)); | |
12e41d03 | 579 | pim_inet4_dump("<rpf?>", up->rpf.rpf_addr, rpf_addr_str, sizeof(rpf_addr_str)); |
05e451f8 | 580 | zlog_debug("%s: matching neigh=%s against upstream (S,G)=%s joined=%d rpf_addr=%s", |
12e41d03 | 581 | __PRETTY_FUNCTION__, |
05e451f8 | 582 | neigh_str, pim_str_sg_dump (&up->sg), |
12e41d03 DL |
583 | up->join_state == PIM_UPSTREAM_JOINED, |
584 | rpf_addr_str); | |
585 | } | |
586 | ||
587 | /* consider only (S,G) upstream in Joined state */ | |
588 | if (up->join_state != PIM_UPSTREAM_JOINED) | |
589 | continue; | |
590 | ||
591 | /* match RPF'(S,G)=neigh_addr */ | |
592 | if (up->rpf.rpf_addr.s_addr != neigh_addr.s_addr) | |
593 | continue; | |
594 | ||
595 | pim_upstream_join_timer_decrease_to_t_override("RPF'(S,G) GenID change", | |
596 | up, neigh_addr); | |
597 | } | |
598 | } | |
599 | ||
600 | ||
601 | void pim_upstream_rpf_interface_changed(struct pim_upstream *up, | |
602 | struct interface *old_rpf_ifp) | |
603 | { | |
604 | struct listnode *ifnode; | |
605 | struct listnode *ifnextnode; | |
606 | struct interface *ifp; | |
607 | ||
608 | /* scan all interfaces */ | |
469351b3 | 609 | for (ALL_LIST_ELEMENTS (vrf_iflist (VRF_DEFAULT), ifnode, ifnextnode, ifp)) { |
12e41d03 DL |
610 | struct listnode *chnode; |
611 | struct listnode *chnextnode; | |
612 | struct pim_ifchannel *ch; | |
613 | struct pim_interface *pim_ifp; | |
614 | ||
615 | pim_ifp = ifp->info; | |
616 | if (!pim_ifp) | |
617 | continue; | |
618 | ||
619 | /* search all ifchannels */ | |
620 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_ifchannel_list, chnode, chnextnode, ch)) { | |
621 | if (ch->upstream != up) | |
622 | continue; | |
623 | ||
624 | if (ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) { | |
625 | if ( | |
626 | /* RPF_interface(S) was NOT I */ | |
627 | (old_rpf_ifp == ch->interface) | |
628 | && | |
629 | /* RPF_interface(S) stopped being I */ | |
630 | (ch->upstream->rpf.source_nexthop.interface != ch->interface) | |
631 | ) { | |
632 | assert_action_a5(ch); | |
633 | } | |
634 | } /* PIM_IFASSERT_I_AM_LOSER */ | |
635 | ||
636 | pim_ifchannel_update_assert_tracking_desired(ch); | |
637 | } | |
638 | } | |
639 | } | |
640 | ||
641 | void pim_upstream_update_could_assert(struct pim_upstream *up) | |
642 | { | |
643 | struct listnode *ifnode; | |
644 | struct listnode *ifnextnode; | |
645 | struct listnode *chnode; | |
646 | struct listnode *chnextnode; | |
647 | struct interface *ifp; | |
648 | struct pim_interface *pim_ifp; | |
649 | struct pim_ifchannel *ch; | |
650 | ||
651 | /* scan all interfaces */ | |
469351b3 | 652 | for (ALL_LIST_ELEMENTS (vrf_iflist (VRF_DEFAULT), ifnode, ifnextnode, ifp)) { |
12e41d03 DL |
653 | pim_ifp = ifp->info; |
654 | if (!pim_ifp) | |
655 | continue; | |
656 | ||
657 | /* scan per-interface (S,G) state */ | |
658 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_ifchannel_list, chnode, chnextnode, ch)) { | |
659 | ||
660 | if (ch->upstream != up) | |
661 | continue; | |
662 | ||
663 | pim_ifchannel_update_could_assert(ch); | |
664 | ||
665 | } /* scan iface channel list */ | |
666 | } /* scan iflist */ | |
667 | } | |
668 | ||
669 | void pim_upstream_update_my_assert_metric(struct pim_upstream *up) | |
670 | { | |
671 | struct listnode *ifnode; | |
672 | struct listnode *ifnextnode; | |
673 | struct listnode *chnode; | |
674 | struct listnode *chnextnode; | |
675 | struct interface *ifp; | |
676 | struct pim_interface *pim_ifp; | |
677 | struct pim_ifchannel *ch; | |
678 | ||
679 | /* scan all interfaces */ | |
469351b3 | 680 | for (ALL_LIST_ELEMENTS (vrf_iflist (VRF_DEFAULT), ifnode, ifnextnode, ifp)) { |
12e41d03 DL |
681 | pim_ifp = ifp->info; |
682 | if (!pim_ifp) | |
683 | continue; | |
684 | ||
685 | /* scan per-interface (S,G) state */ | |
686 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_ifchannel_list, chnode, chnextnode, ch)) { | |
687 | ||
688 | if (ch->upstream != up) | |
689 | continue; | |
690 | ||
691 | pim_ifchannel_update_my_assert_metric(ch); | |
692 | ||
693 | } /* scan iface channel list */ | |
694 | } /* scan iflist */ | |
695 | } | |
696 | ||
697 | static void pim_upstream_update_assert_tracking_desired(struct pim_upstream *up) | |
698 | { | |
699 | struct listnode *ifnode; | |
700 | struct listnode *ifnextnode; | |
701 | struct listnode *chnode; | |
702 | struct listnode *chnextnode; | |
703 | struct interface *ifp; | |
704 | struct pim_interface *pim_ifp; | |
705 | struct pim_ifchannel *ch; | |
706 | ||
707 | /* scan all interfaces */ | |
469351b3 | 708 | for (ALL_LIST_ELEMENTS (vrf_iflist (VRF_DEFAULT), ifnode, ifnextnode, ifp)) { |
12e41d03 DL |
709 | pim_ifp = ifp->info; |
710 | if (!pim_ifp) | |
711 | continue; | |
712 | ||
713 | /* scan per-interface (S,G) state */ | |
714 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_ifchannel_list, chnode, chnextnode, ch)) { | |
715 | ||
716 | if (ch->upstream != up) | |
717 | continue; | |
718 | ||
719 | pim_ifchannel_update_assert_tracking_desired(ch); | |
720 | ||
721 | } /* scan iface channel list */ | |
722 | } /* scan iflist */ | |
723 | } | |
f14248dd DS |
724 | |
725 | /* | |
726 | * On an RP, the PMBR value must be cleared when the | |
727 | * Keepalive Timer expires | |
728 | */ | |
729 | static int | |
730 | pim_upstream_keep_alive_timer (struct thread *t) | |
731 | { | |
732 | struct pim_upstream *up; | |
733 | ||
734 | up = THREAD_ARG(t); | |
735 | ||
05e451f8 | 736 | if (I_am_RP (up->sg.u.sg.grp)) |
25a335e0 | 737 | { |
65e1fcd7 | 738 | pim_br_clear_pmbr (&up->sg); |
25a335e0 DS |
739 | /* |
740 | * We need to do more here :) | |
741 | * But this is the start. | |
742 | */ | |
743 | } | |
744 | else | |
745 | { | |
746 | pim_mroute_update_counters (up->channel_oil); | |
f14248dd | 747 | |
25a335e0 DS |
748 | if (up->channel_oil->cc.oldpktcnt >= up->channel_oil->cc.pktcnt) |
749 | { | |
750 | pim_mroute_del (up->channel_oil); | |
751 | pim_upstream_delete (up); | |
752 | } | |
753 | else | |
754 | { | |
755 | up->t_ka_timer = NULL; | |
756 | pim_upstream_keep_alive_timer_start (up, PIM_KEEPALIVE_PERIOD); | |
757 | } | |
758 | } | |
cb40b272 | 759 | return 1; |
f14248dd DS |
760 | } |
761 | ||
f14248dd DS |
762 | void |
763 | pim_upstream_keep_alive_timer_start (struct pim_upstream *up, | |
764 | uint32_t time) | |
765 | { | |
766 | THREAD_TIMER_ON (master, | |
767 | up->t_ka_timer, | |
768 | pim_upstream_keep_alive_timer, | |
769 | up, time); | |
770 | } | |
cb40b272 DS |
771 | |
772 | /* | |
773 | * 4.2.1 Last-Hop Switchover to the SPT | |
774 | * | |
775 | * In Sparse-Mode PIM, last-hop routers join the shared tree towards the | |
776 | * RP. Once traffic from sources to joined groups arrives at a last-hop | |
777 | * router, it has the option of switching to receive the traffic on a | |
778 | * shortest path tree (SPT). | |
779 | * | |
780 | * The decision for a router to switch to the SPT is controlled as | |
781 | * follows: | |
782 | * | |
783 | * void | |
784 | * CheckSwitchToSpt(S,G) { | |
785 | * if ( ( pim_include(*,G) (-) pim_exclude(S,G) | |
786 | * (+) pim_include(S,G) != NULL ) | |
787 | * AND SwitchToSptDesired(S,G) ) { | |
788 | * # Note: Restarting the KAT will result in the SPT switch | |
789 | * set KeepaliveTimer(S,G) to Keepalive_Period | |
790 | * } | |
791 | * } | |
792 | * | |
793 | * SwitchToSptDesired(S,G) is a policy function that is implementation | |
794 | * defined. An "infinite threshold" policy can be implemented by making | |
795 | * SwitchToSptDesired(S,G) return false all the time. A "switch on | |
796 | * first packet" policy can be implemented by making | |
797 | * SwitchToSptDesired(S,G) return true once a single packet has been | |
798 | * received for the source and group. | |
799 | */ | |
800 | int | |
ad410c6c | 801 | pim_upstream_switch_to_spt_desired (struct prefix *sg) |
cb40b272 | 802 | { |
a3b58b4a DS |
803 | if (I_am_RP (sg->u.sg.grp)) |
804 | return 1; | |
805 | ||
cb40b272 DS |
806 | return 0; |
807 | } | |
d7259eac DS |
808 | |
809 | const char * | |
810 | pim_upstream_state2str (struct pim_upstream *up) | |
811 | { | |
812 | switch (up->join_state) | |
813 | { | |
814 | case PIM_UPSTREAM_NOTJOINED: | |
815 | return "NtJnd"; | |
816 | break; | |
817 | case PIM_UPSTREAM_JOINED: | |
818 | return "Jnd"; | |
819 | break; | |
820 | case PIM_UPSTREAM_JOIN_PENDING: | |
821 | return "JPend"; | |
822 | break; | |
823 | case PIM_UPSTREAM_PRUNE: | |
824 | return "Prune"; | |
825 | break; | |
826 | } | |
827 | return "Unkwn"; | |
828 | } | |
627ed2a3 DS |
829 | |
830 | static int | |
831 | pim_upstream_register_stop_timer (struct thread *t) | |
832 | { | |
833 | struct pim_upstream *up; | |
834 | struct pim_rpf *rpg; | |
835 | struct ip ip_hdr; | |
836 | ||
837 | up = THREAD_ARG (t); | |
838 | ||
839 | up->t_rs_timer = NULL; | |
840 | ||
841 | if (PIM_DEBUG_TRACE) | |
842 | { | |
05e451f8 DS |
843 | zlog_debug ("%s: (S,G)=%s upstream register stop timer %d", |
844 | __PRETTY_FUNCTION__, pim_str_sg_dump (&up->sg), up->join_state); | |
627ed2a3 DS |
845 | } |
846 | ||
847 | switch (up->join_state) | |
848 | { | |
849 | case PIM_UPSTREAM_JOIN_PENDING: | |
850 | up->join_state = PIM_UPSTREAM_JOINED; | |
851 | break; | |
852 | case PIM_UPSTREAM_PRUNE: | |
853 | up->join_state = PIM_UPSTREAM_JOIN_PENDING; | |
854 | pim_upstream_start_register_stop_timer (up, 1); | |
855 | ||
05e451f8 | 856 | rpg = RP (up->sg.u.sg.grp); |
627ed2a3 DS |
857 | memset (&ip_hdr, 0, sizeof (struct ip)); |
858 | ip_hdr.ip_p = PIM_IP_PROTO_PIM; | |
859 | ip_hdr.ip_hl = 5; | |
860 | ip_hdr.ip_v = 4; | |
05e451f8 DS |
861 | ip_hdr.ip_src = up->sg.u.sg.src; |
862 | ip_hdr.ip_dst = up->sg.u.sg.grp; | |
627ed2a3 DS |
863 | ip_hdr.ip_len = 20; |
864 | // checksum is broken | |
865 | pim_register_send ((uint8_t *)&ip_hdr, sizeof (struct ip), rpg, 1); | |
866 | pim_channel_add_oif (up->channel_oil, pim_regiface, PIM_OIF_FLAG_PROTO_PIM); | |
867 | break; | |
868 | default: | |
869 | break; | |
870 | } | |
871 | ||
872 | return 0; | |
873 | } | |
874 | ||
875 | void | |
876 | pim_upstream_start_register_stop_timer (struct pim_upstream *up, int null_register) | |
877 | { | |
878 | uint32_t time; | |
879 | ||
880 | if (up->t_rs_timer) | |
881 | { | |
882 | THREAD_TIMER_OFF (up->t_rs_timer); | |
883 | up->t_rs_timer = NULL; | |
884 | } | |
885 | ||
886 | if (!null_register) | |
887 | { | |
888 | uint32_t lower = (0.5 * PIM_REGISTER_SUPPRESSION_PERIOD); | |
889 | uint32_t upper = (1.5 * PIM_REGISTER_SUPPRESSION_PERIOD); | |
890 | time = lower + (random () % (upper - lower + 1)) - PIM_REGISTER_PROBE_PERIOD; | |
891 | } | |
892 | else | |
893 | time = PIM_REGISTER_PROBE_PERIOD; | |
894 | ||
895 | if (PIM_DEBUG_TRACE) | |
896 | { | |
05e451f8 DS |
897 | zlog_debug ("%s: (S,G)=%s Starting upstream register stop timer %d", |
898 | __PRETTY_FUNCTION__, pim_str_sg_dump (&up->sg), time); | |
627ed2a3 DS |
899 | } |
900 | THREAD_TIMER_ON (master, up->t_rs_timer, | |
901 | pim_upstream_register_stop_timer, | |
902 | up, time); | |
903 | } | |
4fdc8f36 DS |
904 | |
905 | /* | |
906 | * For a given upstream, determine the inherited_olist | |
907 | * and apply it. | |
219e0013 DS |
908 | * |
909 | * inherited_olist(S,G,rpt) = | |
910 | * ( joins(*,*,RP(G)) (+) joins(*,G) (-) prunes(S,G,rpt) ) | |
911 | * (+) ( pim_include(*,G) (-) pim_exclude(S,G)) | |
912 | * (-) ( lost_assert(*,G) (+) lost_assert(S,G,rpt) ) | |
913 | * | |
914 | * inherited_olist(S,G) = | |
915 | * inherited_olist(S,G,rpt) (+) | |
916 | * joins(S,G) (+) pim_include(S,G) (-) lost_assert(S,G) | |
917 | * | |
4fdc8f36 DS |
918 | * return 1 if there are any output interfaces |
919 | * return 0 if there are not any output interfaces | |
920 | */ | |
921 | int | |
922 | pim_upstream_inherited_olist (struct pim_upstream *up) | |
923 | { | |
219e0013 DS |
924 | struct pim_upstream *anysrc_up; |
925 | struct pim_interface *pim_ifp; | |
926 | struct listnode *ifnextnode; | |
927 | struct listnode *chnextnode; | |
928 | struct pim_ifchannel *ch; | |
929 | struct listnode *chnode; | |
930 | struct listnode *ifnode; | |
931 | struct interface *ifp; | |
932 | struct prefix anysrc; | |
933 | int output_intf = 0; | |
934 | ||
935 | anysrc = up->sg; | |
936 | anysrc.u.sg.src.s_addr = INADDR_ANY; | |
937 | ||
938 | anysrc_up = pim_upstream_find (&anysrc); | |
939 | if (anysrc_up) | |
940 | { | |
941 | for (ALL_LIST_ELEMENTS (vrf_iflist (VRF_DEFAULT), ifnode, ifnextnode, ifp)) | |
942 | { | |
943 | pim_ifp = ifp->info; | |
944 | if (!pim_ifp) | |
945 | continue; | |
946 | ||
947 | for (ALL_LIST_ELEMENTS (pim_ifp->pim_ifchannel_list, chnode, chnextnode, ch)) | |
948 | { | |
216bb84f DS |
949 | struct pim_ifchannel *nch; |
950 | ||
219e0013 DS |
951 | if (ch->upstream != anysrc_up) |
952 | continue; | |
953 | ||
954 | if (ch->ifjoin_state == PIM_IFJOIN_JOIN) | |
955 | { | |
216bb84f DS |
956 | nch = pim_ifchannel_add (ifp, &up->sg); |
957 | pim_ifchannel_ifjoin_switch (__PRETTY_FUNCTION__, nch, PIM_IFJOIN_JOIN); | |
958 | pim_forward_start (ch); | |
219e0013 DS |
959 | output_intf++; |
960 | } | |
961 | } | |
962 | } | |
963 | } | |
964 | ||
965 | if (output_intf) | |
216bb84f DS |
966 | if (up->join_state != PIM_UPSTREAM_JOINED) |
967 | pim_upstream_switch (up, PIM_UPSTREAM_JOINED); | |
219e0013 DS |
968 | |
969 | return output_intf; | |
4fdc8f36 | 970 | } |