]>
Commit | Line | Data |
---|---|---|
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 | ||
d9c9a9ee DS |
51 | int 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) | |
68 | return -1; | |
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++; |
d62a17ae | 86 | return 0; |
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); | |
110 | return -1; | |
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; | |
182 | return 0; | |
183 | } else | |
184 | return -1; | |
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; | |
204 | struct pim_nexthop_cache pnc; | |
d62a17ae | 205 | struct prefix src, grp; |
57695eb6 | 206 | bool neigh_needed = true; |
d62a17ae | 207 | |
208 | saved.source_nexthop = rpf->source_nexthop; | |
209 | saved.rpf_addr = rpf->rpf_addr; | |
210 | ||
211 | if (is_new && PIM_DEBUG_ZEBRA) { | |
212 | char source_str[INET_ADDRSTRLEN]; | |
213 | pim_inet4_dump("<source?>", up->upstream_addr, source_str, | |
214 | sizeof(source_str)); | |
215 | zlog_debug("%s: NHT Register upstream %s addr %s with Zebra.", | |
216 | __PRETTY_FUNCTION__, up->sg_str, source_str); | |
217 | } | |
218 | /* Register addr with Zebra NHT */ | |
219 | nht_p.family = AF_INET; | |
220 | nht_p.prefixlen = IPV4_MAX_BITLEN; | |
221 | nht_p.u.prefix4.s_addr = up->upstream_addr.s_addr; | |
222 | ||
223 | src.family = AF_INET; | |
224 | src.prefixlen = IPV4_MAX_BITLEN; | |
225 | src.u.prefix4 = up->upstream_addr; // RP or Src address | |
226 | grp.family = AF_INET; | |
227 | grp.prefixlen = IPV4_MAX_BITLEN; | |
228 | grp.u.prefix4 = up->sg.grp; | |
229 | memset(&pnc, 0, sizeof(struct pim_nexthop_cache)); | |
57695eb6 DS |
230 | |
231 | if ((up->sg.src.s_addr == INADDR_ANY && I_am_RP(pim, up->sg.grp)) || | |
232 | PIM_UPSTREAM_FLAG_TEST_FHR(up->flags)) | |
233 | neigh_needed = FALSE; | |
cc0cecae | 234 | if (pim_find_or_track_nexthop(pim, &nht_p, up, NULL, &pnc)) { |
d62a17ae | 235 | if (pnc.nexthop_num) { |
57695eb6 DS |
236 | if (!pim_ecmp_nexthop_search(pim, &pnc, |
237 | &up->rpf.source_nexthop, | |
238 | &src, &grp, neigh_needed)) | |
d62a17ae | 239 | return PIM_RPF_FAILURE; |
d62a17ae | 240 | } |
241 | } else { | |
b938537b | 242 | if (!pim_ecmp_nexthop_lookup(pim, &rpf->source_nexthop, &src, |
57695eb6 | 243 | &grp, neigh_needed)) |
d62a17ae | 244 | return PIM_RPF_FAILURE; |
d62a17ae | 245 | } |
246 | ||
247 | rpf->rpf_addr.family = AF_INET; | |
248 | rpf->rpf_addr.u.prefix4 = pim_rpf_find_rpf_addr(up); | |
249 | if (pim_rpf_addr_is_inaddr_any(rpf) && PIM_DEBUG_ZEBRA) { | |
250 | /* RPF'(S,G) not found */ | |
251 | zlog_debug("%s %s: RPF'%s not found: won't send join upstream", | |
252 | __FILE__, __PRETTY_FUNCTION__, up->sg_str); | |
253 | /* warning only */ | |
254 | } | |
255 | ||
256 | /* detect change in pim_nexthop */ | |
257 | if (nexthop_mismatch(&rpf->source_nexthop, &saved.source_nexthop)) { | |
258 | ||
259 | if (PIM_DEBUG_ZEBRA) { | |
260 | char nhaddr_str[PREFIX_STRLEN]; | |
261 | pim_addr_dump("<addr?>", | |
262 | &rpf->source_nexthop.mrib_nexthop_addr, | |
263 | nhaddr_str, sizeof(nhaddr_str)); | |
264 | zlog_debug("%s %s: (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d", | |
12e41d03 | 265 | __FILE__, __PRETTY_FUNCTION__, |
8bfb8b67 | 266 | up->sg_str, |
12e41d03 DL |
267 | rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<ifname?>", |
268 | nhaddr_str, | |
269 | rpf->source_nexthop.mrib_metric_preference, | |
270 | rpf->source_nexthop.mrib_route_metric); | |
d62a17ae | 271 | } |
12e41d03 | 272 | |
cc0cecae | 273 | pim_upstream_update_join_desired(pim, up); |
d62a17ae | 274 | pim_upstream_update_could_assert(up); |
275 | pim_upstream_update_my_assert_metric(up); | |
276 | } | |
12e41d03 | 277 | |
d62a17ae | 278 | /* detect change in RPF_interface(S) */ |
279 | if (saved.source_nexthop.interface != rpf->source_nexthop.interface) { | |
12e41d03 | 280 | |
d62a17ae | 281 | if (PIM_DEBUG_ZEBRA) { |
282 | zlog_debug("%s %s: (S,G)=%s RPF_interface(S) changed from %s to %s", | |
12e41d03 | 283 | __FILE__, __PRETTY_FUNCTION__, |
8bfb8b67 | 284 | up->sg_str, |
42a0111b | 285 | saved.source_nexthop.interface ? saved.source_nexthop.interface->name : "<oldif?>", |
12e41d03 | 286 | rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<newif?>"); |
d62a17ae | 287 | /* warning only */ |
288 | } | |
289 | ||
290 | pim_upstream_rpf_interface_changed( | |
291 | up, saved.source_nexthop.interface); | |
292 | } | |
293 | ||
294 | /* detect change in RPF'(S,G) */ | |
295 | if (saved.rpf_addr.u.prefix4.s_addr != rpf->rpf_addr.u.prefix4.s_addr | |
296 | || saved.source_nexthop | |
297 | .interface != rpf->source_nexthop.interface) { | |
298 | ||
299 | /* return old rpf to caller ? */ | |
300 | if (old) { | |
301 | old->source_nexthop = saved.source_nexthop; | |
302 | old->rpf_addr = saved.rpf_addr; | |
303 | } | |
304 | return PIM_RPF_CHANGED; | |
305 | } | |
306 | ||
307 | return PIM_RPF_OK; | |
12e41d03 DL |
308 | } |
309 | ||
310 | /* | |
311 | RFC 4601: 4.1.6. State Summarization Macros | |
312 | ||
313 | neighbor RPF'(S,G) { | |
d62a17ae | 314 | if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) { |
315 | return AssertWinner(S, G, RPF_interface(S) ) | |
316 | } else { | |
317 | return NBR( RPF_interface(S), MRIB.next_hop( S ) ) | |
318 | } | |
12e41d03 DL |
319 | } |
320 | ||
321 | RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data | |
322 | packets should be coming and to which joins should be sent on the RP | |
323 | tree and SPT, respectively. | |
324 | */ | |
325 | static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up) | |
326 | { | |
d62a17ae | 327 | struct pim_ifchannel *rpf_ch; |
328 | struct pim_neighbor *neigh; | |
329 | struct in_addr rpf_addr; | |
330 | ||
331 | if (!up->rpf.source_nexthop.interface) { | |
332 | zlog_warn("%s: missing RPF interface for upstream (S,G)=%s", | |
333 | __PRETTY_FUNCTION__, up->sg_str); | |
334 | ||
335 | rpf_addr.s_addr = PIM_NET_INADDR_ANY; | |
336 | return rpf_addr; | |
337 | } | |
338 | ||
339 | rpf_ch = pim_ifchannel_find(up->rpf.source_nexthop.interface, &up->sg); | |
340 | if (rpf_ch) { | |
341 | if (rpf_ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) { | |
342 | return rpf_ch->ifassert_winner; | |
343 | } | |
344 | } | |
345 | ||
346 | /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */ | |
347 | ||
348 | neigh = pim_if_find_neighbor( | |
349 | up->rpf.source_nexthop.interface, | |
350 | up->rpf.source_nexthop.mrib_nexthop_addr.u.prefix4); | |
351 | if (neigh) | |
352 | rpf_addr = neigh->source_addr; | |
353 | else | |
354 | rpf_addr.s_addr = PIM_NET_INADDR_ANY; | |
355 | ||
356 | return rpf_addr; | |
12e41d03 | 357 | } |
63c59d0c | 358 | |
d62a17ae | 359 | int pim_rpf_addr_is_inaddr_none(struct pim_rpf *rpf) |
63c59d0c | 360 | { |
d62a17ae | 361 | switch (rpf->rpf_addr.family) { |
362 | case AF_INET: | |
363 | return rpf->rpf_addr.u.prefix4.s_addr == INADDR_NONE; | |
364 | break; | |
365 | case AF_INET6: | |
366 | zlog_warn("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__); | |
367 | return 1; | |
368 | break; | |
369 | default: | |
370 | return 0; | |
371 | break; | |
372 | } | |
373 | ||
374 | return 0; | |
63c59d0c DS |
375 | } |
376 | ||
d62a17ae | 377 | int pim_rpf_addr_is_inaddr_any(struct pim_rpf *rpf) |
63c59d0c | 378 | { |
d62a17ae | 379 | switch (rpf->rpf_addr.family) { |
380 | case AF_INET: | |
381 | return rpf->rpf_addr.u.prefix4.s_addr == INADDR_ANY; | |
382 | break; | |
383 | case AF_INET6: | |
384 | zlog_warn("%s: v6 Unimplmented", __PRETTY_FUNCTION__); | |
385 | return 1; | |
386 | break; | |
387 | default: | |
388 | return 0; | |
389 | break; | |
390 | } | |
391 | ||
392 | return 0; | |
63c59d0c | 393 | } |
66cc32fa | 394 | |
d62a17ae | 395 | int pim_rpf_is_same(struct pim_rpf *rpf1, struct pim_rpf *rpf2) |
66cc32fa | 396 | { |
d62a17ae | 397 | if (rpf1->source_nexthop.interface == rpf2->source_nexthop.interface) |
398 | return 1; | |
66cc32fa | 399 | |
d62a17ae | 400 | return 0; |
66cc32fa | 401 | } |
c2cf4b02 DS |
402 | |
403 | unsigned int pim_rpf_hash_key(void *arg) | |
404 | { | |
405 | struct pim_nexthop_cache *r = (struct pim_nexthop_cache *)arg; | |
406 | ||
407 | return jhash_1word(r->rpf.rpf_addr.u.prefix4.s_addr, 0); | |
408 | } | |
409 | ||
74df8d6d | 410 | bool pim_rpf_equal(const void *arg1, const void *arg2) |
c2cf4b02 DS |
411 | { |
412 | const struct pim_nexthop_cache *r1 = | |
413 | (const struct pim_nexthop_cache *)arg1; | |
414 | const struct pim_nexthop_cache *r2 = | |
415 | (const struct pim_nexthop_cache *)arg2; | |
416 | ||
417 | return prefix_same(&r1->rpf.rpf_addr, &r2->rpf.rpf_addr); | |
418 | } |