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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 | ||
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( | |
bfc92019 | 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 | } | |
173 | /* update nextop data */ | |
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; |
206 | ||
207 | saved.source_nexthop = rpf->source_nexthop; | |
208 | saved.rpf_addr = rpf->rpf_addr; | |
209 | ||
210 | if (is_new && PIM_DEBUG_ZEBRA) { | |
211 | char source_str[INET_ADDRSTRLEN]; | |
212 | pim_inet4_dump("<source?>", up->upstream_addr, source_str, | |
213 | sizeof(source_str)); | |
214 | zlog_debug("%s: NHT Register upstream %s addr %s with Zebra.", | |
215 | __PRETTY_FUNCTION__, up->sg_str, source_str); | |
216 | } | |
217 | /* Register addr with Zebra NHT */ | |
218 | nht_p.family = AF_INET; | |
219 | nht_p.prefixlen = IPV4_MAX_BITLEN; | |
220 | nht_p.u.prefix4.s_addr = up->upstream_addr.s_addr; | |
221 | ||
222 | src.family = AF_INET; | |
223 | src.prefixlen = IPV4_MAX_BITLEN; | |
224 | src.u.prefix4 = up->upstream_addr; // RP or Src address | |
225 | grp.family = AF_INET; | |
226 | grp.prefixlen = IPV4_MAX_BITLEN; | |
227 | grp.u.prefix4 = up->sg.grp; | |
228 | memset(&pnc, 0, sizeof(struct pim_nexthop_cache)); | |
cc0cecae | 229 | if (pim_find_or_track_nexthop(pim, &nht_p, up, NULL, &pnc)) { |
d62a17ae | 230 | if (pnc.nexthop_num) { |
cb9c7c50 | 231 | if (!pim_ecmp_nexthop_search( |
cc0cecae | 232 | pim, &pnc, &up->rpf.source_nexthop, &src, |
25b787a2 | 233 | &grp, |
d62a17ae | 234 | !PIM_UPSTREAM_FLAG_TEST_FHR(up->flags) |
235 | && !PIM_UPSTREAM_FLAG_TEST_SRC_IGMP( | |
236 | up->flags))) | |
d62a17ae | 237 | return PIM_RPF_FAILURE; |
d62a17ae | 238 | } |
239 | } else { | |
cb9c7c50 | 240 | if (!pim_ecmp_nexthop_lookup( |
cc0cecae | 241 | pim, &rpf->source_nexthop, up->upstream_addr, &src, |
996c9314 LB |
242 | &grp, |
243 | !PIM_UPSTREAM_FLAG_TEST_FHR(up->flags) | |
244 | && !PIM_UPSTREAM_FLAG_TEST_SRC_IGMP( | |
245 | up->flags))) | |
d62a17ae | 246 | return PIM_RPF_FAILURE; |
d62a17ae | 247 | } |
248 | ||
249 | rpf->rpf_addr.family = AF_INET; | |
250 | rpf->rpf_addr.u.prefix4 = pim_rpf_find_rpf_addr(up); | |
251 | if (pim_rpf_addr_is_inaddr_any(rpf) && PIM_DEBUG_ZEBRA) { | |
252 | /* RPF'(S,G) not found */ | |
253 | zlog_debug("%s %s: RPF'%s not found: won't send join upstream", | |
254 | __FILE__, __PRETTY_FUNCTION__, up->sg_str); | |
255 | /* warning only */ | |
256 | } | |
257 | ||
258 | /* detect change in pim_nexthop */ | |
259 | if (nexthop_mismatch(&rpf->source_nexthop, &saved.source_nexthop)) { | |
260 | ||
261 | if (PIM_DEBUG_ZEBRA) { | |
262 | char nhaddr_str[PREFIX_STRLEN]; | |
263 | pim_addr_dump("<addr?>", | |
264 | &rpf->source_nexthop.mrib_nexthop_addr, | |
265 | nhaddr_str, sizeof(nhaddr_str)); | |
266 | zlog_debug("%s %s: (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d", | |
12e41d03 | 267 | __FILE__, __PRETTY_FUNCTION__, |
8bfb8b67 | 268 | up->sg_str, |
12e41d03 DL |
269 | rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<ifname?>", |
270 | nhaddr_str, | |
271 | rpf->source_nexthop.mrib_metric_preference, | |
272 | rpf->source_nexthop.mrib_route_metric); | |
d62a17ae | 273 | } |
12e41d03 | 274 | |
cc0cecae | 275 | pim_upstream_update_join_desired(pim, up); |
d62a17ae | 276 | pim_upstream_update_could_assert(up); |
277 | pim_upstream_update_my_assert_metric(up); | |
278 | } | |
12e41d03 | 279 | |
d62a17ae | 280 | /* detect change in RPF_interface(S) */ |
281 | if (saved.source_nexthop.interface != rpf->source_nexthop.interface) { | |
12e41d03 | 282 | |
d62a17ae | 283 | if (PIM_DEBUG_ZEBRA) { |
284 | zlog_debug("%s %s: (S,G)=%s RPF_interface(S) changed from %s to %s", | |
12e41d03 | 285 | __FILE__, __PRETTY_FUNCTION__, |
8bfb8b67 | 286 | up->sg_str, |
42a0111b | 287 | saved.source_nexthop.interface ? saved.source_nexthop.interface->name : "<oldif?>", |
12e41d03 | 288 | rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<newif?>"); |
d62a17ae | 289 | /* warning only */ |
290 | } | |
291 | ||
292 | pim_upstream_rpf_interface_changed( | |
293 | up, saved.source_nexthop.interface); | |
294 | } | |
295 | ||
296 | /* detect change in RPF'(S,G) */ | |
297 | if (saved.rpf_addr.u.prefix4.s_addr != rpf->rpf_addr.u.prefix4.s_addr | |
298 | || saved.source_nexthop | |
299 | .interface != rpf->source_nexthop.interface) { | |
300 | ||
301 | /* return old rpf to caller ? */ | |
302 | if (old) { | |
303 | old->source_nexthop = saved.source_nexthop; | |
304 | old->rpf_addr = saved.rpf_addr; | |
305 | } | |
306 | return PIM_RPF_CHANGED; | |
307 | } | |
308 | ||
309 | return PIM_RPF_OK; | |
12e41d03 DL |
310 | } |
311 | ||
312 | /* | |
313 | RFC 4601: 4.1.6. State Summarization Macros | |
314 | ||
315 | neighbor RPF'(S,G) { | |
d62a17ae | 316 | if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) { |
317 | return AssertWinner(S, G, RPF_interface(S) ) | |
318 | } else { | |
319 | return NBR( RPF_interface(S), MRIB.next_hop( S ) ) | |
320 | } | |
12e41d03 DL |
321 | } |
322 | ||
323 | RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data | |
324 | packets should be coming and to which joins should be sent on the RP | |
325 | tree and SPT, respectively. | |
326 | */ | |
327 | static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up) | |
328 | { | |
d62a17ae | 329 | struct pim_ifchannel *rpf_ch; |
330 | struct pim_neighbor *neigh; | |
331 | struct in_addr rpf_addr; | |
332 | ||
333 | if (!up->rpf.source_nexthop.interface) { | |
334 | zlog_warn("%s: missing RPF interface for upstream (S,G)=%s", | |
335 | __PRETTY_FUNCTION__, up->sg_str); | |
336 | ||
337 | rpf_addr.s_addr = PIM_NET_INADDR_ANY; | |
338 | return rpf_addr; | |
339 | } | |
340 | ||
341 | rpf_ch = pim_ifchannel_find(up->rpf.source_nexthop.interface, &up->sg); | |
342 | if (rpf_ch) { | |
343 | if (rpf_ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) { | |
344 | return rpf_ch->ifassert_winner; | |
345 | } | |
346 | } | |
347 | ||
348 | /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */ | |
349 | ||
350 | neigh = pim_if_find_neighbor( | |
351 | up->rpf.source_nexthop.interface, | |
352 | up->rpf.source_nexthop.mrib_nexthop_addr.u.prefix4); | |
353 | if (neigh) | |
354 | rpf_addr = neigh->source_addr; | |
355 | else | |
356 | rpf_addr.s_addr = PIM_NET_INADDR_ANY; | |
357 | ||
358 | return rpf_addr; | |
12e41d03 | 359 | } |
63c59d0c | 360 | |
d62a17ae | 361 | int pim_rpf_addr_is_inaddr_none(struct pim_rpf *rpf) |
63c59d0c | 362 | { |
d62a17ae | 363 | switch (rpf->rpf_addr.family) { |
364 | case AF_INET: | |
365 | return rpf->rpf_addr.u.prefix4.s_addr == INADDR_NONE; | |
366 | break; | |
367 | case AF_INET6: | |
368 | zlog_warn("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__); | |
369 | return 1; | |
370 | break; | |
371 | default: | |
372 | return 0; | |
373 | break; | |
374 | } | |
375 | ||
376 | return 0; | |
63c59d0c DS |
377 | } |
378 | ||
d62a17ae | 379 | int pim_rpf_addr_is_inaddr_any(struct pim_rpf *rpf) |
63c59d0c | 380 | { |
d62a17ae | 381 | switch (rpf->rpf_addr.family) { |
382 | case AF_INET: | |
383 | return rpf->rpf_addr.u.prefix4.s_addr == INADDR_ANY; | |
384 | break; | |
385 | case AF_INET6: | |
386 | zlog_warn("%s: v6 Unimplmented", __PRETTY_FUNCTION__); | |
387 | return 1; | |
388 | break; | |
389 | default: | |
390 | return 0; | |
391 | break; | |
392 | } | |
393 | ||
394 | return 0; | |
63c59d0c | 395 | } |
66cc32fa | 396 | |
d62a17ae | 397 | int pim_rpf_is_same(struct pim_rpf *rpf1, struct pim_rpf *rpf2) |
66cc32fa | 398 | { |
d62a17ae | 399 | if (rpf1->source_nexthop.interface == rpf2->source_nexthop.interface) |
400 | return 1; | |
66cc32fa | 401 | |
d62a17ae | 402 | return 0; |
66cc32fa | 403 | } |
c2cf4b02 DS |
404 | |
405 | unsigned int pim_rpf_hash_key(void *arg) | |
406 | { | |
407 | struct pim_nexthop_cache *r = (struct pim_nexthop_cache *)arg; | |
408 | ||
409 | return jhash_1word(r->rpf.rpf_addr.u.prefix4.s_addr, 0); | |
410 | } | |
411 | ||
412 | int pim_rpf_equal(const void *arg1, const void *arg2) | |
413 | { | |
414 | const struct pim_nexthop_cache *r1 = | |
415 | (const struct pim_nexthop_cache *)arg1; | |
416 | const struct pim_nexthop_cache *r2 = | |
417 | (const struct pim_nexthop_cache *)arg2; | |
418 | ||
419 | return prefix_same(&r1->rpf.rpf_addr, &r2->rpf.rpf_addr); | |
420 | } |