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12e41d03 | 1 | /* |
896014f4 DL |
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 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 | |
18 | */ | |
12e41d03 DL |
19 | |
20 | #include <zebra.h> | |
21 | ||
22 | #include "log.h" | |
23 | #include "prefix.h" | |
744d91b3 | 24 | #include "if.h" |
12e41d03 DL |
25 | |
26 | #include "pimd.h" | |
27 | #include "pim_str.h" | |
28 | #include "pim_tlv.h" | |
29 | #include "pim_msg.h" | |
30 | #include "pim_pim.h" | |
31 | #include "pim_int.h" | |
32 | #include "pim_time.h" | |
33 | #include "pim_iface.h" | |
34 | #include "pim_hello.h" | |
35 | #include "pim_macro.h" | |
36 | #include "pim_assert.h" | |
37 | #include "pim_ifchannel.h" | |
38 | ||
39 | static int assert_action_a3(struct pim_ifchannel *ch); | |
40 | static void assert_action_a2(struct pim_ifchannel *ch, | |
41 | struct pim_assert_metric winner_metric); | |
42 | static void assert_action_a6(struct pim_ifchannel *ch, | |
43 | struct pim_assert_metric winner_metric); | |
44 | ||
45 | void pim_ifassert_winner_set(struct pim_ifchannel *ch, | |
46 | enum pim_ifassert_state new_state, | |
47 | struct in_addr winner, | |
48 | struct pim_assert_metric winner_metric) | |
49 | { | |
50 | int winner_changed = (ch->ifassert_winner.s_addr != winner.s_addr); | |
51 | int metric_changed = !pim_assert_metric_match(&ch->ifassert_winner_metric, | |
52 | &winner_metric); | |
53 | ||
54 | if (PIM_DEBUG_PIM_EVENTS) { | |
55 | if (ch->ifassert_state != new_state) { | |
99064df9 DS |
56 | zlog_debug("%s: (S,G)=%s assert state changed from %s to %s on interface %s", |
57 | __PRETTY_FUNCTION__, | |
8bfb8b67 | 58 | ch->sg_str, |
99064df9 DS |
59 | pim_ifchannel_ifassert_name(ch->ifassert_state), |
60 | pim_ifchannel_ifassert_name(new_state), | |
61 | ch->interface->name); | |
12e41d03 DL |
62 | } |
63 | ||
64 | if (winner_changed) { | |
eaa54bdb DW |
65 | char was_str[INET_ADDRSTRLEN]; |
66 | char winner_str[INET_ADDRSTRLEN]; | |
12e41d03 DL |
67 | pim_inet4_dump("<was?>", ch->ifassert_winner, was_str, sizeof(was_str)); |
68 | pim_inet4_dump("<winner?>", winner, winner_str, sizeof(winner_str)); | |
99064df9 DS |
69 | zlog_debug("%s: (S,G)=%s assert winner changed from %s to %s on interface %s", |
70 | __PRETTY_FUNCTION__, | |
8bfb8b67 | 71 | ch->sg_str, |
99064df9 | 72 | was_str, winner_str, ch->interface->name); |
12e41d03 DL |
73 | } |
74 | } /* PIM_DEBUG_PIM_EVENTS */ | |
75 | ||
76 | ch->ifassert_state = new_state; | |
77 | ch->ifassert_winner = winner; | |
78 | ch->ifassert_winner_metric = winner_metric; | |
79 | ch->ifassert_creation = pim_time_monotonic_sec(); | |
80 | ||
81 | if (winner_changed || metric_changed) { | |
82 | pim_upstream_update_join_desired(ch->upstream); | |
83 | pim_ifchannel_update_could_assert(ch); | |
84 | pim_ifchannel_update_assert_tracking_desired(ch); | |
85 | } | |
86 | } | |
87 | ||
88 | static void on_trace(const char *label, | |
89 | struct interface *ifp, struct in_addr src) | |
90 | { | |
91 | if (PIM_DEBUG_PIM_TRACE) { | |
eaa54bdb | 92 | char src_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
93 | pim_inet4_dump("<src?>", src, src_str, sizeof(src_str)); |
94 | zlog_debug("%s: from %s on %s", | |
95 | label, src_str, ifp->name); | |
96 | } | |
97 | } | |
98 | ||
99 | static int preferred_assert(const struct pim_ifchannel *ch, | |
100 | const struct pim_assert_metric *recv_metric) | |
101 | { | |
102 | return pim_assert_metric_better(recv_metric, | |
103 | &ch->ifassert_winner_metric); | |
104 | } | |
105 | ||
106 | static int acceptable_assert(const struct pim_assert_metric *my_metric, | |
107 | const struct pim_assert_metric *recv_metric) | |
108 | { | |
109 | return pim_assert_metric_better(recv_metric, | |
110 | my_metric); | |
111 | } | |
112 | ||
113 | static int inferior_assert(const struct pim_assert_metric *my_metric, | |
114 | const struct pim_assert_metric *recv_metric) | |
115 | { | |
116 | return pim_assert_metric_better(my_metric, | |
117 | recv_metric); | |
118 | } | |
119 | ||
120 | static int cancel_assert(const struct pim_assert_metric *recv_metric) | |
121 | { | |
122 | return (recv_metric->metric_preference == PIM_ASSERT_METRIC_PREFERENCE_MAX) | |
123 | && | |
124 | (recv_metric->route_metric == PIM_ASSERT_ROUTE_METRIC_MAX); | |
125 | } | |
126 | ||
127 | static void if_could_assert_do_a1(const char *caller, | |
128 | struct pim_ifchannel *ch) | |
129 | { | |
130 | if (PIM_IF_FLAG_TEST_COULD_ASSERT(ch->flags)) { | |
131 | if (assert_action_a1(ch)) { | |
99064df9 | 132 | zlog_warn("%s: %s: (S,G)=%s assert_action_a1 failure on interface %s", |
12e41d03 | 133 | __PRETTY_FUNCTION__, caller, |
8bfb8b67 | 134 | ch->sg_str, ch->interface->name); |
12e41d03 DL |
135 | /* log warning only */ |
136 | } | |
137 | } | |
138 | } | |
139 | ||
140 | static int dispatch_assert(struct interface *ifp, | |
141 | struct in_addr source_addr, | |
142 | struct in_addr group_addr, | |
143 | struct pim_assert_metric recv_metric) | |
144 | { | |
145 | struct pim_ifchannel *ch; | |
4ed0af70 | 146 | struct prefix_sg sg; |
12e41d03 | 147 | |
4ed0af70 DS |
148 | memset (&sg, 0, sizeof (struct prefix_sg)); |
149 | sg.src = source_addr; | |
150 | sg.grp = group_addr; | |
4a40c37a | 151 | ch = pim_ifchannel_add(ifp, &sg, 0); |
12e41d03 | 152 | if (!ch) { |
5074a423 | 153 | zlog_warn("%s: (S,G)=%s failure creating channel on interface %s", |
12e41d03 | 154 | __PRETTY_FUNCTION__, |
5074a423 | 155 | pim_str_sg_dump (&sg), ifp->name); |
12e41d03 DL |
156 | return -1; |
157 | } | |
158 | ||
159 | switch (ch->ifassert_state) { | |
160 | case PIM_IFASSERT_NOINFO: | |
161 | if (recv_metric.rpt_bit_flag) { | |
162 | /* RPT bit set */ | |
163 | if_could_assert_do_a1(__PRETTY_FUNCTION__, ch); | |
164 | } | |
165 | else { | |
166 | /* RPT bit clear */ | |
167 | if (inferior_assert(&ch->ifassert_my_metric, &recv_metric)) { | |
168 | if_could_assert_do_a1(__PRETTY_FUNCTION__, ch); | |
169 | } | |
170 | else if (acceptable_assert(&ch->ifassert_my_metric, &recv_metric)) { | |
171 | if (PIM_IF_FLAG_TEST_ASSERT_TRACKING_DESIRED(ch->flags)) { | |
172 | assert_action_a6(ch, recv_metric); | |
173 | } | |
174 | } | |
175 | } | |
176 | break; | |
177 | case PIM_IFASSERT_I_AM_WINNER: | |
178 | if (preferred_assert(ch, &recv_metric)) { | |
179 | assert_action_a2(ch, recv_metric); | |
180 | } | |
181 | else { | |
182 | if (inferior_assert(&ch->ifassert_my_metric, &recv_metric)) { | |
12e41d03 DL |
183 | assert_action_a3(ch); |
184 | } | |
185 | } | |
186 | break; | |
187 | case PIM_IFASSERT_I_AM_LOSER: | |
188 | if (recv_metric.ip_address.s_addr == ch->ifassert_winner.s_addr) { | |
189 | /* Assert from current winner */ | |
190 | ||
191 | if (cancel_assert(&recv_metric)) { | |
192 | assert_action_a5(ch); | |
193 | } | |
194 | else { | |
195 | if (inferior_assert(&ch->ifassert_my_metric, &recv_metric)) { | |
196 | assert_action_a5(ch); | |
197 | } | |
198 | else if (acceptable_assert(&ch->ifassert_my_metric, &recv_metric)) { | |
199 | if (!recv_metric.rpt_bit_flag) { | |
200 | assert_action_a2(ch, recv_metric); | |
201 | } | |
202 | } | |
203 | } | |
204 | } | |
205 | else if (preferred_assert(ch, &recv_metric)) { | |
206 | assert_action_a2(ch, recv_metric); | |
207 | } | |
208 | break; | |
209 | default: | |
210 | { | |
5074a423 | 211 | zlog_warn("%s: (S,G)=%s invalid assert state %d on interface %s", |
12e41d03 | 212 | __PRETTY_FUNCTION__, |
8bfb8b67 | 213 | ch->sg_str, ch->ifassert_state, ifp->name); |
12e41d03 DL |
214 | } |
215 | return -2; | |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | int pim_assert_recv(struct interface *ifp, | |
222 | struct pim_neighbor *neigh, | |
223 | struct in_addr src_addr, | |
224 | uint8_t *buf, int buf_size) | |
225 | { | |
bce0e645 | 226 | struct prefix_sg sg; |
12e41d03 DL |
227 | struct prefix msg_source_addr; |
228 | struct pim_assert_metric msg_metric; | |
229 | int offset; | |
230 | uint8_t *curr; | |
231 | int curr_size; | |
39438188 | 232 | struct pim_interface *pim_ifp = NULL; |
12e41d03 DL |
233 | |
234 | on_trace(__PRETTY_FUNCTION__, ifp, src_addr); | |
235 | ||
236 | curr = buf; | |
237 | curr_size = buf_size; | |
238 | ||
239 | /* | |
240 | Parse assert group addr | |
241 | */ | |
53e39e14 | 242 | memset (&sg, 0, sizeof (struct prefix_sg)); |
bce0e645 | 243 | offset = pim_parse_addr_group (&sg, curr, curr_size); |
12e41d03 | 244 | if (offset < 1) { |
eaa54bdb | 245 | char src_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
246 | pim_inet4_dump("<src?>", src_addr, src_str, sizeof(src_str)); |
247 | zlog_warn("%s: pim_parse_addr_group() failure: from %s on %s", | |
248 | __PRETTY_FUNCTION__, | |
249 | src_str, ifp->name); | |
250 | return -1; | |
251 | } | |
252 | curr += offset; | |
253 | curr_size -= offset; | |
254 | ||
255 | /* | |
256 | Parse assert source addr | |
257 | */ | |
4416b1f6 | 258 | offset = pim_parse_addr_ucast (&msg_source_addr, curr, curr_size); |
12e41d03 | 259 | if (offset < 1) { |
eaa54bdb | 260 | char src_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
261 | pim_inet4_dump("<src?>", src_addr, src_str, sizeof(src_str)); |
262 | zlog_warn("%s: pim_parse_addr_ucast() failure: from %s on %s", | |
263 | __PRETTY_FUNCTION__, | |
264 | src_str, ifp->name); | |
265 | return -2; | |
266 | } | |
267 | curr += offset; | |
268 | curr_size -= offset; | |
269 | ||
270 | if (curr_size != 8) { | |
eaa54bdb | 271 | char src_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
272 | pim_inet4_dump("<src?>", src_addr, src_str, sizeof(src_str)); |
273 | zlog_warn("%s: preference/metric size is not 8: size=%d from %s on interface %s", | |
274 | __PRETTY_FUNCTION__, | |
275 | curr_size, | |
276 | src_str, ifp->name); | |
277 | return -3; | |
278 | } | |
279 | ||
280 | /* | |
281 | Parse assert metric preference | |
282 | */ | |
283 | ||
284 | msg_metric.metric_preference = pim_read_uint32_host(curr); | |
285 | ||
286 | msg_metric.rpt_bit_flag = msg_metric.metric_preference & 0x80000000; /* save highest bit */ | |
287 | msg_metric.metric_preference &= ~0x80000000; /* clear highest bit */ | |
288 | ||
289 | curr += 4; | |
290 | ||
291 | /* | |
292 | Parse assert route metric | |
293 | */ | |
294 | ||
295 | msg_metric.route_metric = pim_read_uint32_host(curr); | |
296 | ||
297 | if (PIM_DEBUG_PIM_TRACE) { | |
eaa54bdb DW |
298 | char neigh_str[INET_ADDRSTRLEN]; |
299 | char source_str[INET_ADDRSTRLEN]; | |
300 | char group_str[INET_ADDRSTRLEN]; | |
12e41d03 DL |
301 | pim_inet4_dump("<neigh?>", src_addr, neigh_str, sizeof(neigh_str)); |
302 | pim_inet4_dump("<src?>", msg_source_addr.u.prefix4, source_str, sizeof(source_str)); | |
bce0e645 | 303 | pim_inet4_dump("<grp?>", sg.grp, group_str, sizeof(group_str)); |
12e41d03 DL |
304 | zlog_debug("%s: from %s on %s: (S,G)=(%s,%s) pref=%u metric=%u rpt_bit=%u", |
305 | __PRETTY_FUNCTION__, neigh_str, ifp->name, | |
306 | source_str, group_str, | |
307 | msg_metric.metric_preference, | |
308 | msg_metric.route_metric, | |
309 | PIM_FORCE_BOOLEAN(msg_metric.rpt_bit_flag)); | |
310 | } | |
311 | ||
312 | msg_metric.ip_address = src_addr; | |
313 | ||
39438188 CS |
314 | pim_ifp = ifp->info; |
315 | zassert(pim_ifp); | |
316 | ++pim_ifp->pim_ifstat_assert_recv; | |
317 | ||
12e41d03 DL |
318 | return dispatch_assert(ifp, |
319 | msg_source_addr.u.prefix4, | |
bce0e645 | 320 | sg.grp, |
12e41d03 DL |
321 | msg_metric); |
322 | } | |
323 | ||
324 | /* | |
325 | RFC 4601: 4.6.3. Assert Metrics | |
326 | ||
327 | Assert metrics are defined as: | |
328 | ||
329 | When comparing assert_metrics, the rpt_bit_flag, metric_preference, | |
330 | and route_metric field are compared in order, where the first lower | |
331 | value wins. If all fields are equal, the primary IP address of the | |
332 | router that sourced the Assert message is used as a tie-breaker, | |
333 | with the highest IP address winning. | |
334 | */ | |
335 | int pim_assert_metric_better(const struct pim_assert_metric *m1, | |
336 | const struct pim_assert_metric *m2) | |
337 | { | |
338 | if (m1->rpt_bit_flag < m2->rpt_bit_flag) | |
339 | return 1; | |
340 | if (m1->rpt_bit_flag > m2->rpt_bit_flag) | |
341 | return 0; | |
342 | ||
343 | if (m1->metric_preference < m2->metric_preference) | |
344 | return 1; | |
345 | if (m1->metric_preference > m2->metric_preference) | |
346 | return 0; | |
347 | ||
348 | if (m1->route_metric < m2->route_metric) | |
349 | return 1; | |
350 | if (m1->route_metric > m2->route_metric) | |
351 | return 0; | |
352 | ||
353 | return ntohl(m1->ip_address.s_addr) > ntohl(m2->ip_address.s_addr); | |
354 | } | |
355 | ||
356 | int pim_assert_metric_match(const struct pim_assert_metric *m1, | |
357 | const struct pim_assert_metric *m2) | |
358 | { | |
359 | if (m1->rpt_bit_flag != m2->rpt_bit_flag) | |
360 | return 0; | |
361 | if (m1->metric_preference != m2->metric_preference) | |
362 | return 0; | |
363 | if (m1->route_metric != m2->route_metric) | |
364 | return 0; | |
365 | ||
366 | return m1->ip_address.s_addr == m2->ip_address.s_addr; | |
367 | } | |
368 | ||
369 | int pim_assert_build_msg(uint8_t *pim_msg, int buf_size, | |
370 | struct interface *ifp, | |
371 | struct in_addr group_addr, | |
372 | struct in_addr source_addr, | |
373 | uint32_t metric_preference, | |
374 | uint32_t route_metric, | |
375 | uint32_t rpt_bit_flag) | |
376 | { | |
377 | uint8_t *buf_pastend = pim_msg + buf_size; | |
378 | uint8_t *pim_msg_curr; | |
379 | int pim_msg_size; | |
380 | int remain; | |
381 | ||
382 | pim_msg_curr = pim_msg + PIM_MSG_HEADER_LEN; /* skip room for pim header */ | |
383 | ||
384 | /* Encode group */ | |
385 | remain = buf_pastend - pim_msg_curr; | |
f8e7d799 | 386 | pim_msg_curr = pim_msg_addr_encode_ipv4_group(pim_msg_curr, group_addr); |
12e41d03 | 387 | if (!pim_msg_curr) { |
eaa54bdb | 388 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
389 | pim_inet4_dump("<grp?>", group_addr, group_str, sizeof(group_str)); |
390 | zlog_warn("%s: failure encoding group address %s: space left=%d", | |
391 | __PRETTY_FUNCTION__, group_str, remain); | |
392 | return -1; | |
393 | } | |
394 | ||
395 | /* Encode source */ | |
396 | remain = buf_pastend - pim_msg_curr; | |
f8e7d799 | 397 | pim_msg_curr = pim_msg_addr_encode_ipv4_ucast(pim_msg_curr, source_addr); |
12e41d03 | 398 | if (!pim_msg_curr) { |
eaa54bdb | 399 | char source_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
400 | pim_inet4_dump("<src?>", source_addr, source_str, sizeof(source_str)); |
401 | zlog_warn("%s: failure encoding source address %s: space left=%d", | |
402 | __PRETTY_FUNCTION__, source_str, remain); | |
403 | return -2; | |
404 | } | |
405 | ||
406 | /* Metric preference */ | |
407 | pim_write_uint32(pim_msg_curr, rpt_bit_flag ? | |
408 | metric_preference | 0x80000000 : | |
409 | metric_preference); | |
410 | pim_msg_curr += 4; | |
411 | ||
412 | /* Route metric */ | |
413 | pim_write_uint32(pim_msg_curr, route_metric); | |
414 | pim_msg_curr += 4; | |
415 | ||
416 | /* | |
417 | Add PIM header | |
418 | */ | |
419 | pim_msg_size = pim_msg_curr - pim_msg; | |
420 | pim_msg_build_header(pim_msg, pim_msg_size, | |
421 | PIM_MSG_TYPE_ASSERT); | |
422 | ||
423 | return pim_msg_size; | |
424 | } | |
425 | ||
426 | static int pim_assert_do(struct pim_ifchannel *ch, | |
427 | struct pim_assert_metric metric) | |
428 | { | |
429 | struct interface *ifp; | |
430 | struct pim_interface *pim_ifp; | |
431 | uint8_t pim_msg[1000]; | |
432 | int pim_msg_size; | |
433 | ||
434 | ifp = ch->interface; | |
a85d8802 DS |
435 | if (!ifp) |
436 | { | |
437 | if (PIM_DEBUG_PIM_TRACE) | |
438 | zlog_debug("%s: channel%s has no associated interface!", | |
439 | __PRETTY_FUNCTION__, ch->sg_str); | |
440 | return -1; | |
441 | } | |
12e41d03 DL |
442 | pim_ifp = ifp->info; |
443 | if (!pim_ifp) { | |
a85d8802 DS |
444 | if (PIM_DEBUG_PIM_TRACE) |
445 | zlog_debug("%s: channel %s pim not enabled on interface: %s", | |
446 | __PRETTY_FUNCTION__, ch->sg_str, ifp->name); | |
12e41d03 DL |
447 | return -1; |
448 | } | |
449 | ||
450 | pim_msg_size = pim_assert_build_msg(pim_msg, sizeof(pim_msg), ifp, | |
4ed0af70 | 451 | ch->sg.grp, ch->sg.src, |
12e41d03 DL |
452 | metric.metric_preference, |
453 | metric.route_metric, | |
454 | metric.rpt_bit_flag); | |
455 | if (pim_msg_size < 1) { | |
456 | zlog_warn("%s: failure building PIM assert message: msg_size=%d", | |
457 | __PRETTY_FUNCTION__, pim_msg_size); | |
458 | return -2; | |
459 | } | |
460 | ||
461 | /* | |
462 | RFC 4601: 4.3.1. Sending Hello Messages | |
463 | ||
464 | Thus, if a router needs to send a Join/Prune or Assert message on | |
465 | an interface on which it has not yet sent a Hello message with the | |
466 | currently configured IP address, then it MUST immediately send the | |
467 | relevant Hello message without waiting for the Hello Timer to | |
468 | expire, followed by the Join/Prune or Assert message. | |
469 | */ | |
470 | pim_hello_require(ifp); | |
471 | ||
472 | if (PIM_DEBUG_PIM_TRACE) { | |
99064df9 | 473 | zlog_debug("%s: to %s: (S,G)=%s pref=%u metric=%u rpt_bit=%u", |
12e41d03 | 474 | __PRETTY_FUNCTION__, |
8bfb8b67 | 475 | ifp->name, ch->sg_str, |
12e41d03 DL |
476 | metric.metric_preference, |
477 | metric.route_metric, | |
478 | PIM_FORCE_BOOLEAN(metric.rpt_bit_flag)); | |
479 | } | |
39438188 | 480 | ++pim_ifp->pim_ifstat_assert_send; |
12e41d03 DL |
481 | |
482 | if (pim_msg_send(pim_ifp->pim_sock_fd, | |
4df01a4e | 483 | pim_ifp->primary_address, |
12e41d03 DL |
484 | qpim_all_pim_routers_addr, |
485 | pim_msg, | |
486 | pim_msg_size, | |
487 | ifp->name)) { | |
488 | zlog_warn("%s: could not send PIM message on interface %s", | |
489 | __PRETTY_FUNCTION__, ifp->name); | |
490 | return -3; | |
491 | } | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
496 | int pim_assert_send(struct pim_ifchannel *ch) | |
497 | { | |
498 | return pim_assert_do(ch, ch->ifassert_my_metric); | |
499 | } | |
500 | ||
501 | /* | |
502 | RFC 4601: 4.6.4. AssertCancel Messages | |
503 | ||
504 | An AssertCancel(S,G) is an infinite metric assert with the RPT bit | |
505 | set that names S as the source. | |
506 | */ | |
507 | static int pim_assert_cancel(struct pim_ifchannel *ch) | |
508 | { | |
509 | struct pim_assert_metric metric; | |
510 | ||
511 | metric.rpt_bit_flag = 0; | |
512 | metric.metric_preference = PIM_ASSERT_METRIC_PREFERENCE_MAX; | |
513 | metric.route_metric = PIM_ASSERT_ROUTE_METRIC_MAX; | |
4ed0af70 | 514 | metric.ip_address = ch->sg.src; |
12e41d03 DL |
515 | |
516 | return pim_assert_do(ch, metric); | |
517 | } | |
518 | ||
519 | static int on_assert_timer(struct thread *t) | |
520 | { | |
521 | struct pim_ifchannel *ch; | |
522 | struct interface *ifp; | |
523 | ||
12e41d03 | 524 | ch = THREAD_ARG(t); |
12e41d03 DL |
525 | |
526 | ifp = ch->interface; | |
12e41d03 DL |
527 | |
528 | if (PIM_DEBUG_PIM_TRACE) { | |
99064df9 | 529 | zlog_debug("%s: (S,G)=%s timer expired on interface %s", |
12e41d03 | 530 | __PRETTY_FUNCTION__, |
8bfb8b67 | 531 | ch->sg_str, ifp->name); |
12e41d03 DL |
532 | } |
533 | ||
59ba0ac3 | 534 | ch->t_ifassert_timer = NULL; |
12e41d03 DL |
535 | |
536 | switch (ch->ifassert_state) { | |
537 | case PIM_IFASSERT_I_AM_WINNER: | |
12e41d03 DL |
538 | assert_action_a3(ch); |
539 | break; | |
540 | case PIM_IFASSERT_I_AM_LOSER: | |
541 | assert_action_a5(ch); | |
542 | break; | |
543 | default: | |
544 | { | |
a85d8802 DS |
545 | if (PIM_DEBUG_PIM_EVENTS) |
546 | zlog_warn("%s: (S,G)=%s invalid assert state %d on interface %s", | |
547 | __PRETTY_FUNCTION__, | |
548 | ch->sg_str, ch->ifassert_state, ifp->name); | |
12e41d03 DL |
549 | } |
550 | } | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | static void assert_timer_off(struct pim_ifchannel *ch) | |
556 | { | |
12e41d03 DL |
557 | if (PIM_DEBUG_PIM_TRACE) { |
558 | if (ch->t_ifassert_timer) { | |
99064df9 | 559 | zlog_debug("%s: (S,G)=%s cancelling timer on interface %s", |
12e41d03 | 560 | __PRETTY_FUNCTION__, |
a85d8802 | 561 | ch->sg_str, ch->interface->name); |
12e41d03 DL |
562 | } |
563 | } | |
564 | THREAD_OFF(ch->t_ifassert_timer); | |
12e41d03 DL |
565 | } |
566 | ||
567 | static void pim_assert_timer_set(struct pim_ifchannel *ch, | |
568 | int interval) | |
569 | { | |
12e41d03 DL |
570 | assert_timer_off(ch); |
571 | ||
572 | if (PIM_DEBUG_PIM_TRACE) { | |
99064df9 | 573 | zlog_debug("%s: (S,G)=%s starting %u sec timer on interface %s", |
12e41d03 | 574 | __PRETTY_FUNCTION__, |
a85d8802 | 575 | ch->sg_str, interval, ch->interface->name); |
12e41d03 DL |
576 | } |
577 | ||
ffa2c898 QY |
578 | thread_add_timer(master, on_assert_timer, ch, interval, |
579 | &ch->t_ifassert_timer); | |
12e41d03 DL |
580 | } |
581 | ||
582 | static void pim_assert_timer_reset(struct pim_ifchannel *ch) | |
583 | { | |
584 | pim_assert_timer_set(ch, PIM_ASSERT_TIME - PIM_ASSERT_OVERRIDE_INTERVAL); | |
585 | } | |
586 | ||
587 | /* | |
588 | RFC 4601: 4.6.1. (S,G) Assert Message State Machine | |
589 | ||
590 | (S,G) Assert State machine Actions | |
591 | ||
592 | A1: Send Assert(S,G). | |
593 | Set Assert Timer to (Assert_Time - Assert_Override_Interval). | |
594 | Store self as AssertWinner(S,G,I). | |
595 | Store spt_assert_metric(S,I) as AssertWinnerMetric(S,G,I). | |
596 | */ | |
597 | int assert_action_a1(struct pim_ifchannel *ch) | |
598 | { | |
599 | struct interface *ifp = ch->interface; | |
600 | struct pim_interface *pim_ifp; | |
601 | ||
12e41d03 DL |
602 | pim_ifp = ifp->info; |
603 | if (!pim_ifp) { | |
99064df9 | 604 | zlog_warn("%s: (S,G)=%s multicast not enabled on interface %s", |
12e41d03 | 605 | __PRETTY_FUNCTION__, |
8bfb8b67 | 606 | ch->sg_str, ifp->name); |
12e41d03 DL |
607 | return -1; /* must return since pim_ifp is used below */ |
608 | } | |
609 | ||
610 | /* Switch to I_AM_WINNER before performing action_a3 below */ | |
611 | pim_ifassert_winner_set(ch, PIM_IFASSERT_I_AM_WINNER, | |
612 | pim_ifp->primary_address, | |
613 | pim_macro_spt_assert_metric(&ch->upstream->rpf, | |
614 | pim_ifp->primary_address)); | |
615 | ||
12e41d03 | 616 | if (assert_action_a3(ch)) { |
99064df9 | 617 | zlog_warn("%s: (S,G)=%s assert_action_a3 failure on interface %s", |
12e41d03 | 618 | __PRETTY_FUNCTION__, |
8bfb8b67 | 619 | ch->sg_str, ifp->name); |
12e41d03 DL |
620 | /* warning only */ |
621 | } | |
622 | ||
a85d8802 DS |
623 | if (ch->ifassert_state != PIM_IFASSERT_I_AM_WINNER) |
624 | { | |
625 | if (PIM_DEBUG_PIM_EVENTS) | |
626 | zlog_warn("%s: channel%s not in expected PIM_IFASSERT_I_AM_WINNER state", | |
627 | __PRETTY_FUNCTION__, ch->sg_str); | |
628 | } | |
12e41d03 DL |
629 | |
630 | return 0; | |
631 | } | |
632 | ||
633 | /* | |
634 | RFC 4601: 4.6.1. (S,G) Assert Message State Machine | |
635 | ||
636 | (S,G) Assert State machine Actions | |
637 | ||
638 | A2: Store new assert winner as AssertWinner(S,G,I) and assert | |
639 | winner metric as AssertWinnerMetric(S,G,I). | |
640 | Set Assert Timer to Assert_Time. | |
641 | */ | |
642 | static void assert_action_a2(struct pim_ifchannel *ch, | |
643 | struct pim_assert_metric winner_metric) | |
644 | { | |
645 | pim_ifassert_winner_set(ch, PIM_IFASSERT_I_AM_LOSER, | |
646 | winner_metric.ip_address, | |
647 | winner_metric); | |
648 | ||
649 | pim_assert_timer_set(ch, PIM_ASSERT_TIME); | |
650 | ||
a85d8802 DS |
651 | if (ch->ifassert_state != PIM_IFASSERT_I_AM_LOSER) |
652 | { | |
653 | if (PIM_DEBUG_PIM_EVENTS) | |
654 | zlog_warn("%s: channel%s not in expected PIM_IFASSERT_I_AM_LOSER state", | |
655 | __PRETTY_FUNCTION__, ch->sg_str); | |
656 | } | |
12e41d03 DL |
657 | } |
658 | ||
659 | /* | |
660 | RFC 4601: 4.6.1. (S,G) Assert Message State Machine | |
661 | ||
662 | (S,G) Assert State machine Actions | |
663 | ||
664 | A3: Send Assert(S,G). | |
665 | Set Assert Timer to (Assert_Time - Assert_Override_Interval). | |
666 | */ | |
667 | static int assert_action_a3(struct pim_ifchannel *ch) | |
668 | { | |
a85d8802 DS |
669 | if (ch->ifassert_state != PIM_IFASSERT_I_AM_WINNER) |
670 | { | |
671 | if (PIM_DEBUG_PIM_EVENTS) | |
672 | zlog_warn("%s: channel%s expected to be in PIM_IFASSERT_I_AM_WINNER state", | |
673 | __PRETTY_FUNCTION__, ch->sg_str); | |
674 | return -1; | |
675 | } | |
12e41d03 DL |
676 | |
677 | pim_assert_timer_reset(ch); | |
678 | ||
679 | if (pim_assert_send(ch)) { | |
99064df9 | 680 | zlog_warn("%s: (S,G)=%s failure sending assert on interface %s", |
12e41d03 | 681 | __PRETTY_FUNCTION__, |
8bfb8b67 | 682 | ch->sg_str, ch->interface->name); |
12e41d03 DL |
683 | return -1; |
684 | } | |
685 | ||
12e41d03 DL |
686 | return 0; |
687 | } | |
688 | ||
689 | /* | |
690 | RFC 4601: 4.6.1. (S,G) Assert Message State Machine | |
691 | ||
692 | (S,G) Assert State machine Actions | |
693 | ||
694 | A4: Send AssertCancel(S,G). | |
695 | Delete assert info (AssertWinner(S,G,I) and | |
696 | AssertWinnerMetric(S,G,I) will then return their default | |
697 | values). | |
698 | */ | |
699 | void assert_action_a4(struct pim_ifchannel *ch) | |
700 | { | |
701 | if (pim_assert_cancel(ch)) { | |
99064df9 | 702 | zlog_warn("%s: failure sending AssertCancel%s on interface %s", |
12e41d03 | 703 | __PRETTY_FUNCTION__, |
8bfb8b67 | 704 | ch->sg_str, ch->interface->name); |
12e41d03 DL |
705 | /* log warning only */ |
706 | } | |
707 | ||
708 | assert_action_a5(ch); | |
709 | ||
a85d8802 DS |
710 | if (ch->ifassert_state != PIM_IFASSERT_NOINFO) |
711 | { | |
712 | if (PIM_DEBUG_PIM_EVENTS) | |
713 | zlog_warn("%s: channel%s not in PIM_IFASSERT_NOINFO state as expected", | |
714 | __PRETTY_FUNCTION__, ch->sg_str); | |
715 | } | |
12e41d03 DL |
716 | } |
717 | ||
718 | /* | |
719 | RFC 4601: 4.6.1. (S,G) Assert Message State Machine | |
720 | ||
721 | (S,G) Assert State machine Actions | |
722 | ||
723 | A5: Delete assert info (AssertWinner(S,G,I) and | |
724 | AssertWinnerMetric(S,G,I) will then return their default values). | |
725 | */ | |
726 | void assert_action_a5(struct pim_ifchannel *ch) | |
727 | { | |
728 | reset_ifassert_state(ch); | |
a85d8802 DS |
729 | if (ch->ifassert_state != PIM_IFASSERT_NOINFO) |
730 | { | |
731 | if (PIM_DEBUG_PIM_EVENTS) | |
732 | zlog_warn("%s: channel%s not in PIM_IFSSERT_NOINFO state as expected", | |
733 | __PRETTY_FUNCTION__, ch->sg_str); | |
734 | } | |
12e41d03 DL |
735 | } |
736 | ||
737 | /* | |
738 | RFC 4601: 4.6.1. (S,G) Assert Message State Machine | |
739 | ||
740 | (S,G) Assert State machine Actions | |
741 | ||
742 | A6: Store new assert winner as AssertWinner(S,G,I) and assert | |
743 | winner metric as AssertWinnerMetric(S,G,I). | |
744 | Set Assert Timer to Assert_Time. | |
745 | If (I is RPF_interface(S)) AND (UpstreamJPState(S,G) == true) | |
746 | set SPTbit(S,G) to TRUE. | |
747 | */ | |
748 | static void assert_action_a6(struct pim_ifchannel *ch, | |
749 | struct pim_assert_metric winner_metric) | |
750 | { | |
751 | assert_action_a2(ch, winner_metric); | |
752 | ||
753 | /* | |
754 | If (I is RPF_interface(S)) AND (UpstreamJPState(S,G) == true) set | |
755 | SPTbit(S,G) to TRUE. | |
12e41d03 | 756 | */ |
d99764f6 DS |
757 | if (ch->upstream->rpf.source_nexthop.interface == ch->interface) |
758 | if (ch->upstream->join_state == PIM_UPSTREAM_JOINED) | |
759 | ch->upstream->sptbit = PIM_UPSTREAM_SPTBIT_TRUE; | |
12e41d03 | 760 | |
a85d8802 DS |
761 | if (ch->ifassert_state != PIM_IFASSERT_I_AM_LOSER) |
762 | { | |
763 | if(PIM_DEBUG_PIM_EVENTS) | |
764 | zlog_warn("%s: channel%s not in PIM_IFASSERT_I_AM_LOSER state as expected", | |
765 | __PRETTY_FUNCTION__, ch->sg_str); | |
766 | } | |
12e41d03 DL |
767 | } |
768 |