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Commit | Line | Data |
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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 | ||
744d91b3 DS |
22 | #include "if.h" |
23 | ||
12e41d03 DL |
24 | #include "log.h" |
25 | #include "prefix.h" | |
26 | #include "memory.h" | |
c2cf4b02 | 27 | #include "jhash.h" |
12e41d03 DL |
28 | |
29 | #include "pimd.h" | |
30 | #include "pim_rpf.h" | |
31 | #include "pim_pim.h" | |
32 | #include "pim_str.h" | |
33 | #include "pim_iface.h" | |
34 | #include "pim_zlookup.h" | |
35 | #include "pim_ifchannel.h" | |
e71bf8f7 | 36 | #include "pim_time.h" |
1bc98276 | 37 | #include "pim_nht.h" |
cc0cecae | 38 | #include "pim_oil.h" |
e71bf8f7 | 39 | |
d62a17ae | 40 | static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up); |
12e41d03 | 41 | |
bfc92019 | 42 | void pim_rpf_set_refresh_time(struct pim_instance *pim) |
e71bf8f7 | 43 | { |
bfc92019 | 44 | pim->last_route_change_time = pim_time_monotonic_usec(); |
d62a17ae | 45 | if (PIM_DEBUG_TRACE) |
bfc92019 DS |
46 | zlog_debug("%s: vrf(%s) New last route change time: %" PRId64, |
47 | __PRETTY_FUNCTION__, pim->vrf->name, | |
48 | pim->last_route_change_time); | |
e71bf8f7 DS |
49 | } |
50 | ||
ade155e1 DS |
51 | bool pim_nexthop_lookup(struct pim_instance *pim, struct pim_nexthop *nexthop, |
52 | struct in_addr addr, int neighbor_needed) | |
12e41d03 | 53 | { |
d62a17ae | 54 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
55 | struct pim_neighbor *nbr = NULL; | |
56 | int num_ifindex; | |
57 | struct interface *ifp = NULL; | |
58 | ifindex_t first_ifindex = 0; | |
59 | int found = 0; | |
60 | int i = 0; | |
61 | ||
ea89ab14 DS |
62 | /* |
63 | * We should not attempt to lookup a | |
64 | * 255.255.255.255 address, since | |
65 | * it will never work | |
66 | */ | |
67 | if (addr.s_addr == INADDR_NONE) | |
ade155e1 | 68 | return false; |
ea89ab14 | 69 | |
d62a17ae | 70 | if ((nexthop->last_lookup.s_addr == addr.s_addr) |
bfc92019 | 71 | && (nexthop->last_lookup_time > pim->last_route_change_time)) { |
d62a17ae | 72 | if (PIM_DEBUG_TRACE) { |
73 | char addr_str[INET_ADDRSTRLEN]; | |
74 | pim_inet4_dump("<addr?>", addr, addr_str, | |
75 | sizeof(addr_str)); | |
76 | char nexthop_str[PREFIX_STRLEN]; | |
77 | pim_addr_dump("<nexthop?>", &nexthop->mrib_nexthop_addr, | |
78 | nexthop_str, sizeof(nexthop_str)); | |
79 | zlog_debug( | |
5271457d | 80 | "%s: Using last lookup for %s at %lld, %" PRId64 " addr %s", |
d62a17ae | 81 | __PRETTY_FUNCTION__, addr_str, |
82 | nexthop->last_lookup_time, | |
bfc92019 | 83 | pim->last_route_change_time, nexthop_str); |
d62a17ae | 84 | } |
bfc92019 | 85 | pim->nexthop_lookups_avoided++; |
ade155e1 | 86 | return true; |
d62a17ae | 87 | } else { |
88 | if (PIM_DEBUG_TRACE) { | |
89 | char addr_str[INET_ADDRSTRLEN]; | |
90 | pim_inet4_dump("<addr?>", addr, addr_str, | |
91 | sizeof(addr_str)); | |
92 | zlog_debug( | |
bfc92019 | 93 | "%s: Looking up: %s, last lookup time: %lld, %" PRId64, |
d62a17ae | 94 | __PRETTY_FUNCTION__, addr_str, |
95 | nexthop->last_lookup_time, | |
bfc92019 | 96 | pim->last_route_change_time); |
d62a17ae | 97 | } |
e71bf8f7 | 98 | } |
d62a17ae | 99 | |
100 | memset(nexthop_tab, 0, | |
101 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
71edad0f DS |
102 | num_ifindex = zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, |
103 | addr, PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 104 | if (num_ifindex < 1) { |
105 | char addr_str[INET_ADDRSTRLEN]; | |
106 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
107 | zlog_warn( | |
108 | "%s %s: could not find nexthop ifindex for address %s", | |
109 | __FILE__, __PRETTY_FUNCTION__, addr_str); | |
ade155e1 | 110 | return false; |
d62a17ae | 111 | } |
112 | ||
113 | while (!found && (i < num_ifindex)) { | |
114 | first_ifindex = nexthop_tab[i].ifindex; | |
115 | ||
cc0cecae | 116 | ifp = if_lookup_by_index(first_ifindex, pim->vrf_id); |
d62a17ae | 117 | if (!ifp) { |
118 | if (PIM_DEBUG_ZEBRA) { | |
119 | char addr_str[INET_ADDRSTRLEN]; | |
120 | pim_inet4_dump("<addr?>", addr, addr_str, | |
121 | sizeof(addr_str)); | |
122 | zlog_debug( | |
123 | "%s %s: could not find interface for ifindex %d (address %s)", | |
124 | __FILE__, __PRETTY_FUNCTION__, | |
125 | first_ifindex, addr_str); | |
126 | } | |
127 | i++; | |
128 | continue; | |
129 | } | |
130 | ||
131 | if (!ifp->info) { | |
132 | if (PIM_DEBUG_ZEBRA) { | |
133 | char addr_str[INET_ADDRSTRLEN]; | |
134 | pim_inet4_dump("<addr?>", addr, addr_str, | |
135 | sizeof(addr_str)); | |
136 | zlog_debug( | |
137 | "%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)", | |
138 | __PRETTY_FUNCTION__, ifp->name, | |
139 | first_ifindex, addr_str); | |
140 | } | |
141 | i++; | |
142 | } else if (neighbor_needed | |
143 | && !pim_if_connected_to_source(ifp, addr)) { | |
144 | nbr = pim_neighbor_find( | |
145 | ifp, nexthop_tab[i].nexthop_addr.u.prefix4); | |
146 | if (PIM_DEBUG_PIM_TRACE_DETAIL) | |
147 | zlog_debug("ifp name: %s, pim nbr: %p", | |
148 | ifp->name, nbr); | |
149 | if (!nbr && !if_is_loopback(ifp)) | |
150 | i++; | |
151 | else | |
152 | found = 1; | |
153 | } else | |
154 | found = 1; | |
e71bf8f7 | 155 | } |
d62a17ae | 156 | |
157 | if (found) { | |
158 | if (PIM_DEBUG_ZEBRA) { | |
159 | char nexthop_str[PREFIX_STRLEN]; | |
160 | char addr_str[INET_ADDRSTRLEN]; | |
161 | pim_addr_dump("<nexthop?>", | |
162 | &nexthop_tab[i].nexthop_addr, nexthop_str, | |
163 | sizeof(nexthop_str)); | |
164 | pim_inet4_dump("<addr?>", addr, addr_str, | |
165 | sizeof(addr_str)); | |
166 | zlog_debug( | |
167 | "%s %s: found nexthop %s for address %s: interface %s ifindex=%d metric=%d pref=%d", | |
168 | __FILE__, __PRETTY_FUNCTION__, nexthop_str, | |
169 | addr_str, ifp->name, first_ifindex, | |
170 | nexthop_tab[i].route_metric, | |
171 | nexthop_tab[i].protocol_distance); | |
172 | } | |
1a81b790 | 173 | /* update nexthop data */ |
d62a17ae | 174 | nexthop->interface = ifp; |
175 | nexthop->mrib_nexthop_addr = nexthop_tab[i].nexthop_addr; | |
176 | nexthop->mrib_metric_preference = | |
177 | nexthop_tab[i].protocol_distance; | |
178 | nexthop->mrib_route_metric = nexthop_tab[i].route_metric; | |
179 | nexthop->last_lookup = addr; | |
180 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
181 | nexthop->nbr = nbr; | |
ade155e1 | 182 | return true; |
d62a17ae | 183 | } else |
ade155e1 | 184 | return false; |
12e41d03 DL |
185 | } |
186 | ||
187 | static int nexthop_mismatch(const struct pim_nexthop *nh1, | |
188 | const struct pim_nexthop *nh2) | |
189 | { | |
d62a17ae | 190 | return (nh1->interface != nh2->interface) |
191 | || (nh1->mrib_nexthop_addr.u.prefix4.s_addr | |
192 | != nh2->mrib_nexthop_addr.u.prefix4.s_addr) | |
193 | || (nh1->mrib_metric_preference != nh2->mrib_metric_preference) | |
194 | || (nh1->mrib_route_metric != nh2->mrib_route_metric); | |
12e41d03 DL |
195 | } |
196 | ||
2002dcdb DS |
197 | enum pim_rpf_result pim_rpf_update(struct pim_instance *pim, |
198 | struct pim_upstream *up, struct pim_rpf *old, | |
d62a17ae | 199 | uint8_t is_new) |
12e41d03 | 200 | { |
d62a17ae | 201 | struct pim_rpf *rpf = &up->rpf; |
202 | struct pim_rpf saved; | |
203 | struct prefix nht_p; | |
d62a17ae | 204 | struct prefix src, grp; |
57695eb6 | 205 | bool neigh_needed = true; |
d62a17ae | 206 | |
6a5de0ad AK |
207 | if (PIM_UPSTREAM_FLAG_TEST_STATIC_IIF(up->flags)) |
208 | return PIM_RPF_OK; | |
209 | ||
957d93ea SP |
210 | if (up->upstream_addr.s_addr == INADDR_ANY) { |
211 | zlog_debug("%s: RP is not configured yet for %s", | |
212 | __PRETTY_FUNCTION__, up->sg_str); | |
213 | return PIM_RPF_OK; | |
214 | } | |
215 | ||
d62a17ae | 216 | saved.source_nexthop = rpf->source_nexthop; |
217 | saved.rpf_addr = rpf->rpf_addr; | |
218 | ||
219 | if (is_new && PIM_DEBUG_ZEBRA) { | |
220 | char source_str[INET_ADDRSTRLEN]; | |
221 | pim_inet4_dump("<source?>", up->upstream_addr, source_str, | |
222 | sizeof(source_str)); | |
223 | zlog_debug("%s: NHT Register upstream %s addr %s with Zebra.", | |
224 | __PRETTY_FUNCTION__, up->sg_str, source_str); | |
225 | } | |
226 | /* Register addr with Zebra NHT */ | |
227 | nht_p.family = AF_INET; | |
228 | nht_p.prefixlen = IPV4_MAX_BITLEN; | |
229 | nht_p.u.prefix4.s_addr = up->upstream_addr.s_addr; | |
230 | ||
231 | src.family = AF_INET; | |
232 | src.prefixlen = IPV4_MAX_BITLEN; | |
233 | src.u.prefix4 = up->upstream_addr; // RP or Src address | |
234 | grp.family = AF_INET; | |
235 | grp.prefixlen = IPV4_MAX_BITLEN; | |
236 | grp.u.prefix4 = up->sg.grp; | |
57695eb6 DS |
237 | |
238 | if ((up->sg.src.s_addr == INADDR_ANY && I_am_RP(pim, up->sg.grp)) || | |
239 | PIM_UPSTREAM_FLAG_TEST_FHR(up->flags)) | |
d2853dfe | 240 | neigh_needed = false; |
43763b11 DS |
241 | pim_find_or_track_nexthop(pim, &nht_p, up, NULL, NULL); |
242 | if (!pim_ecmp_nexthop_lookup(pim, &rpf->source_nexthop, &src, &grp, | |
243 | neigh_needed)) | |
244 | return PIM_RPF_FAILURE; | |
d62a17ae | 245 | |
246 | rpf->rpf_addr.family = AF_INET; | |
247 | rpf->rpf_addr.u.prefix4 = pim_rpf_find_rpf_addr(up); | |
248 | if (pim_rpf_addr_is_inaddr_any(rpf) && PIM_DEBUG_ZEBRA) { | |
249 | /* RPF'(S,G) not found */ | |
250 | zlog_debug("%s %s: RPF'%s not found: won't send join upstream", | |
251 | __FILE__, __PRETTY_FUNCTION__, up->sg_str); | |
252 | /* warning only */ | |
253 | } | |
254 | ||
255 | /* detect change in pim_nexthop */ | |
256 | if (nexthop_mismatch(&rpf->source_nexthop, &saved.source_nexthop)) { | |
257 | ||
258 | if (PIM_DEBUG_ZEBRA) { | |
259 | char nhaddr_str[PREFIX_STRLEN]; | |
260 | pim_addr_dump("<addr?>", | |
261 | &rpf->source_nexthop.mrib_nexthop_addr, | |
262 | nhaddr_str, sizeof(nhaddr_str)); | |
263 | zlog_debug("%s %s: (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d", | |
12e41d03 | 264 | __FILE__, __PRETTY_FUNCTION__, |
8bfb8b67 | 265 | up->sg_str, |
12e41d03 DL |
266 | rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<ifname?>", |
267 | nhaddr_str, | |
268 | rpf->source_nexthop.mrib_metric_preference, | |
269 | rpf->source_nexthop.mrib_route_metric); | |
d62a17ae | 270 | } |
12e41d03 | 271 | |
cc0cecae | 272 | pim_upstream_update_join_desired(pim, up); |
d62a17ae | 273 | pim_upstream_update_could_assert(up); |
274 | pim_upstream_update_my_assert_metric(up); | |
275 | } | |
12e41d03 | 276 | |
d62a17ae | 277 | /* detect change in RPF_interface(S) */ |
278 | if (saved.source_nexthop.interface != rpf->source_nexthop.interface) { | |
12e41d03 | 279 | |
d62a17ae | 280 | if (PIM_DEBUG_ZEBRA) { |
281 | zlog_debug("%s %s: (S,G)=%s RPF_interface(S) changed from %s to %s", | |
12e41d03 | 282 | __FILE__, __PRETTY_FUNCTION__, |
8bfb8b67 | 283 | up->sg_str, |
42a0111b | 284 | saved.source_nexthop.interface ? saved.source_nexthop.interface->name : "<oldif?>", |
12e41d03 | 285 | rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<newif?>"); |
d62a17ae | 286 | /* warning only */ |
287 | } | |
288 | ||
289 | pim_upstream_rpf_interface_changed( | |
290 | up, saved.source_nexthop.interface); | |
291 | } | |
292 | ||
293 | /* detect change in RPF'(S,G) */ | |
294 | if (saved.rpf_addr.u.prefix4.s_addr != rpf->rpf_addr.u.prefix4.s_addr | |
295 | || saved.source_nexthop | |
296 | .interface != rpf->source_nexthop.interface) { | |
297 | ||
298 | /* return old rpf to caller ? */ | |
299 | if (old) { | |
300 | old->source_nexthop = saved.source_nexthop; | |
301 | old->rpf_addr = saved.rpf_addr; | |
302 | } | |
303 | return PIM_RPF_CHANGED; | |
304 | } | |
305 | ||
306 | return PIM_RPF_OK; | |
12e41d03 DL |
307 | } |
308 | ||
1250cb5d SP |
309 | /* |
310 | * In the case of RP deletion and RP unreachablity, | |
311 | * uninstall the mroute in the kernel and clear the | |
312 | * rpf information in the pim upstream and pim channel | |
313 | * oil data structure. | |
314 | */ | |
315 | void pim_upstream_rpf_clear(struct pim_instance *pim, | |
316 | struct pim_upstream *up) | |
317 | { | |
318 | if (up->rpf.source_nexthop.interface) { | |
319 | if (up->channel_oil) { | |
320 | up->channel_oil->oil.mfcc_parent = MAXVIFS; | |
1250cb5d SP |
321 | pim_mroute_del(up->channel_oil, __PRETTY_FUNCTION__); |
322 | ||
323 | } | |
324 | pim_upstream_switch(pim, up, PIM_UPSTREAM_NOTJOINED); | |
325 | up->rpf.source_nexthop.interface = NULL; | |
326 | up->rpf.source_nexthop.mrib_nexthop_addr.u.prefix4.s_addr = | |
327 | PIM_NET_INADDR_ANY; | |
328 | up->rpf.source_nexthop.mrib_metric_preference = | |
329 | router->infinite_assert_metric.metric_preference; | |
330 | up->rpf.source_nexthop.mrib_route_metric = | |
331 | router->infinite_assert_metric.route_metric; | |
332 | up->rpf.rpf_addr.u.prefix4.s_addr = PIM_NET_INADDR_ANY; | |
333 | } | |
334 | } | |
335 | ||
12e41d03 DL |
336 | /* |
337 | RFC 4601: 4.1.6. State Summarization Macros | |
338 | ||
339 | neighbor RPF'(S,G) { | |
d62a17ae | 340 | if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) { |
341 | return AssertWinner(S, G, RPF_interface(S) ) | |
342 | } else { | |
343 | return NBR( RPF_interface(S), MRIB.next_hop( S ) ) | |
344 | } | |
12e41d03 DL |
345 | } |
346 | ||
347 | RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data | |
348 | packets should be coming and to which joins should be sent on the RP | |
349 | tree and SPT, respectively. | |
350 | */ | |
351 | static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up) | |
352 | { | |
d62a17ae | 353 | struct pim_ifchannel *rpf_ch; |
354 | struct pim_neighbor *neigh; | |
355 | struct in_addr rpf_addr; | |
356 | ||
357 | if (!up->rpf.source_nexthop.interface) { | |
358 | zlog_warn("%s: missing RPF interface for upstream (S,G)=%s", | |
359 | __PRETTY_FUNCTION__, up->sg_str); | |
360 | ||
361 | rpf_addr.s_addr = PIM_NET_INADDR_ANY; | |
362 | return rpf_addr; | |
363 | } | |
364 | ||
365 | rpf_ch = pim_ifchannel_find(up->rpf.source_nexthop.interface, &up->sg); | |
366 | if (rpf_ch) { | |
367 | if (rpf_ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) { | |
368 | return rpf_ch->ifassert_winner; | |
369 | } | |
370 | } | |
371 | ||
372 | /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */ | |
373 | ||
374 | neigh = pim_if_find_neighbor( | |
375 | up->rpf.source_nexthop.interface, | |
376 | up->rpf.source_nexthop.mrib_nexthop_addr.u.prefix4); | |
377 | if (neigh) | |
378 | rpf_addr = neigh->source_addr; | |
379 | else | |
380 | rpf_addr.s_addr = PIM_NET_INADDR_ANY; | |
381 | ||
382 | return rpf_addr; | |
12e41d03 | 383 | } |
63c59d0c | 384 | |
d62a17ae | 385 | int pim_rpf_addr_is_inaddr_none(struct pim_rpf *rpf) |
63c59d0c | 386 | { |
d62a17ae | 387 | switch (rpf->rpf_addr.family) { |
388 | case AF_INET: | |
389 | return rpf->rpf_addr.u.prefix4.s_addr == INADDR_NONE; | |
390 | break; | |
391 | case AF_INET6: | |
392 | zlog_warn("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__); | |
393 | return 1; | |
394 | break; | |
395 | default: | |
396 | return 0; | |
397 | break; | |
398 | } | |
399 | ||
400 | return 0; | |
63c59d0c DS |
401 | } |
402 | ||
d62a17ae | 403 | int pim_rpf_addr_is_inaddr_any(struct pim_rpf *rpf) |
63c59d0c | 404 | { |
d62a17ae | 405 | switch (rpf->rpf_addr.family) { |
406 | case AF_INET: | |
407 | return rpf->rpf_addr.u.prefix4.s_addr == INADDR_ANY; | |
408 | break; | |
409 | case AF_INET6: | |
410 | zlog_warn("%s: v6 Unimplmented", __PRETTY_FUNCTION__); | |
411 | return 1; | |
412 | break; | |
413 | default: | |
414 | return 0; | |
415 | break; | |
416 | } | |
417 | ||
418 | return 0; | |
63c59d0c | 419 | } |
66cc32fa | 420 | |
d62a17ae | 421 | int pim_rpf_is_same(struct pim_rpf *rpf1, struct pim_rpf *rpf2) |
66cc32fa | 422 | { |
d62a17ae | 423 | if (rpf1->source_nexthop.interface == rpf2->source_nexthop.interface) |
424 | return 1; | |
66cc32fa | 425 | |
d62a17ae | 426 | return 0; |
66cc32fa | 427 | } |
c2cf4b02 DS |
428 | |
429 | unsigned int pim_rpf_hash_key(void *arg) | |
430 | { | |
431 | struct pim_nexthop_cache *r = (struct pim_nexthop_cache *)arg; | |
432 | ||
433 | return jhash_1word(r->rpf.rpf_addr.u.prefix4.s_addr, 0); | |
434 | } | |
435 | ||
74df8d6d | 436 | bool pim_rpf_equal(const void *arg1, const void *arg2) |
c2cf4b02 DS |
437 | { |
438 | const struct pim_nexthop_cache *r1 = | |
439 | (const struct pim_nexthop_cache *)arg1; | |
440 | const struct pim_nexthop_cache *r2 = | |
441 | (const struct pim_nexthop_cache *)arg2; | |
442 | ||
443 | return prefix_same(&r1->rpf.rpf_addr, &r2->rpf.rpf_addr); | |
444 | } |