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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 | |
12e41d03 DL |
19 | */ |
20 | ||
21 | #include <zebra.h> | |
22 | ||
744d91b3 DS |
23 | #include "if.h" |
24 | ||
12e41d03 DL |
25 | #include "log.h" |
26 | #include "prefix.h" | |
27 | #include "memory.h" | |
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 DS |
36 | #include "pim_time.h" |
37 | ||
38 | static long long last_route_change_time = -1; | |
39 | long long nexthop_lookups_avoided = 0; | |
12e41d03 DL |
40 | |
41 | static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up); | |
42 | ||
e71bf8f7 DS |
43 | void |
44 | pim_rpf_set_refresh_time (void) | |
45 | { | |
46 | last_route_change_time = pim_time_monotonic_usec(); | |
47 | if (PIM_DEBUG_TRACE) | |
48 | zlog_debug ("%s: New last route change time: %lld", | |
49 | __PRETTY_FUNCTION__, last_route_change_time); | |
50 | } | |
51 | ||
63b8f7a3 | 52 | int pim_nexthop_lookup(struct pim_nexthop *nexthop, struct in_addr addr, int neighbor_needed) |
12e41d03 | 53 | { |
7b2c4d16 | 54 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
12e41d03 | 55 | int num_ifindex; |
7a6e6567 DS |
56 | struct interface *ifp = NULL; |
57 | ifindex_t first_ifindex = 0; | |
63b8f7a3 DS |
58 | int found = 0; |
59 | int i = 0; | |
12e41d03 | 60 | |
e71bf8f7 DS |
61 | if ((nexthop->last_lookup.s_addr == addr.s_addr) && |
62 | (nexthop->last_lookup_time > last_route_change_time)) | |
63 | { | |
64 | if (PIM_DEBUG_TRACE) | |
65 | { | |
66 | char addr_str[INET_ADDRSTRLEN]; | |
67 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
68 | zlog_debug ("%s: Using last lookup for %s at %lld, %lld", | |
69 | __PRETTY_FUNCTION__, | |
70 | addr_str, | |
71 | nexthop->last_lookup_time, | |
72 | last_route_change_time); | |
73 | } | |
74 | nexthop_lookups_avoided++; | |
75 | return 0; | |
76 | } | |
77 | else | |
78 | { | |
79 | if (PIM_DEBUG_TRACE) | |
80 | { | |
81 | char addr_str[INET_ADDRSTRLEN]; | |
82 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
83 | zlog_debug ("%s: Looking up: %s, last lookup time: %lld, %lld", | |
84 | __PRETTY_FUNCTION__, | |
85 | addr_str, | |
86 | nexthop->last_lookup_time, | |
87 | last_route_change_time); | |
88 | } | |
89 | } | |
90 | ||
7b2c4d16 | 91 | memset (nexthop_tab, 0, sizeof (struct pim_zlookup_nexthop) * MULTIPATH_NUM); |
f24405b1 | 92 | num_ifindex = zclient_lookup_nexthop(nexthop_tab, |
7b2c4d16 | 93 | MULTIPATH_NUM, |
f24405b1 DS |
94 | addr, PIM_NEXTHOP_LOOKUP_MAX); |
95 | if (num_ifindex < 1) { | |
eaa54bdb | 96 | char addr_str[INET_ADDRSTRLEN]; |
f24405b1 DS |
97 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); |
98 | zlog_warn("%s %s: could not find nexthop ifindex for address %s", | |
99 | __FILE__, __PRETTY_FUNCTION__, | |
100 | addr_str); | |
101 | return -1; | |
102 | } | |
103 | ||
518e5727 | 104 | while (!found && (i < num_ifindex)) |
63b8f7a3 DS |
105 | { |
106 | first_ifindex = nexthop_tab[i].ifindex; | |
107 | ||
108 | ifp = if_lookup_by_index(first_ifindex); | |
109 | if (!ifp) | |
110 | { | |
111 | if (PIM_DEBUG_ZEBRA) | |
112 | { | |
eaa54bdb | 113 | char addr_str[INET_ADDRSTRLEN]; |
63b8f7a3 DS |
114 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); |
115 | zlog_debug("%s %s: could not find interface for ifindex %d (address %s)", | |
116 | __FILE__, __PRETTY_FUNCTION__, | |
117 | first_ifindex, addr_str); | |
118 | } | |
28185336 DS |
119 | i++; |
120 | continue; | |
63b8f7a3 DS |
121 | } |
122 | ||
518e5727 | 123 | if (!ifp->info) |
63b8f7a3 | 124 | { |
518e5727 DS |
125 | if (PIM_DEBUG_ZEBRA) |
126 | { | |
127 | char addr_str[INET_ADDRSTRLEN]; | |
128 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
129 | zlog_debug("%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)", | |
130 | __PRETTY_FUNCTION__, | |
131 | ifp->name, first_ifindex, addr_str); | |
132 | } | |
133 | i++; | |
63b8f7a3 | 134 | } |
518e5727 | 135 | else if (neighbor_needed && !pim_if_connected_to_source (ifp, addr)) |
63b8f7a3 DS |
136 | { |
137 | struct pim_neighbor *nbr; | |
138 | ||
139 | nbr = pim_neighbor_find (ifp, nexthop_tab[i].nexthop_addr.u.prefix4); | |
802b226c | 140 | if (PIM_DEBUG_PIM_TRACE_DETAIL) |
63b8f7a3 DS |
141 | zlog_debug ("ifp name: %s, pim nbr: %p", ifp->name, nbr); |
142 | if (!nbr && !if_is_loopback (ifp)) | |
143 | i++; | |
144 | else | |
145 | found = 1; | |
146 | } | |
147 | else | |
148 | found = 1; | |
149 | } | |
150 | ||
151 | if (found) | |
152 | { | |
153 | if (PIM_DEBUG_ZEBRA) { | |
eaa54bdb DW |
154 | char nexthop_str[PREFIX_STRLEN]; |
155 | char addr_str[INET_ADDRSTRLEN]; | |
58c51da2 | 156 | pim_addr_dump("<nexthop?>", &nexthop_tab[i].nexthop_addr, nexthop_str, sizeof(nexthop_str)); |
63b8f7a3 DS |
157 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); |
158 | zlog_debug("%s %s: found nexthop %s for address %s: interface %s ifindex=%d metric=%d pref=%d", | |
159 | __FILE__, __PRETTY_FUNCTION__, | |
160 | nexthop_str, addr_str, | |
161 | ifp->name, first_ifindex, | |
58c51da2 | 162 | nexthop_tab[i].route_metric, |
163 | nexthop_tab[i].protocol_distance); | |
63b8f7a3 DS |
164 | } |
165 | /* update nextop data */ | |
166 | nexthop->interface = ifp; | |
58c51da2 | 167 | nexthop->mrib_nexthop_addr = nexthop_tab[i].nexthop_addr; |
168 | nexthop->mrib_metric_preference = nexthop_tab[i].protocol_distance; | |
169 | nexthop->mrib_route_metric = nexthop_tab[i].route_metric; | |
e71bf8f7 DS |
170 | nexthop->last_lookup = addr; |
171 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
63b8f7a3 DS |
172 | return 0; |
173 | } | |
174 | else | |
7f748d95 | 175 | return -1; |
12e41d03 DL |
176 | } |
177 | ||
178 | static int nexthop_mismatch(const struct pim_nexthop *nh1, | |
179 | const struct pim_nexthop *nh2) | |
180 | { | |
63c59d0c DS |
181 | return (nh1->interface != nh2->interface) || |
182 | (nh1->mrib_nexthop_addr.u.prefix4.s_addr != nh2->mrib_nexthop_addr.u.prefix4.s_addr) || | |
183 | (nh1->mrib_metric_preference != nh2->mrib_metric_preference) || | |
12e41d03 DL |
184 | (nh1->mrib_route_metric != nh2->mrib_route_metric); |
185 | } | |
186 | ||
f24405b1 | 187 | enum pim_rpf_result pim_rpf_update(struct pim_upstream *up, struct in_addr *old_rpf_addr) |
12e41d03 | 188 | { |
63c59d0c | 189 | struct prefix save_rpf_addr; |
12e41d03 DL |
190 | struct pim_nexthop save_nexthop; |
191 | struct pim_rpf *rpf = &up->rpf; | |
192 | ||
193 | save_nexthop = rpf->source_nexthop; /* detect change in pim_nexthop */ | |
194 | save_rpf_addr = rpf->rpf_addr; /* detect change in RPF'(S,G) */ | |
195 | ||
63b8f7a3 | 196 | if (pim_nexthop_lookup(&rpf->source_nexthop, |
4a40c37a DS |
197 | up->upstream_addr, |
198 | !PIM_UPSTREAM_FLAG_TEST_FHR (up->flags) && | |
199 | !PIM_UPSTREAM_FLAG_TEST_SRC_IGMP (up->flags))) { | |
12e41d03 DL |
200 | return PIM_RPF_FAILURE; |
201 | } | |
202 | ||
63c59d0c DS |
203 | rpf->rpf_addr.family = AF_INET; |
204 | rpf->rpf_addr.u.prefix4 = pim_rpf_find_rpf_addr(up); | |
205 | if (pim_rpf_addr_is_inaddr_any(rpf) && PIM_DEBUG_ZEBRA) { | |
12e41d03 | 206 | /* RPF'(S,G) not found */ |
05e451f8 | 207 | zlog_debug("%s %s: RPF'%s not found: won't send join upstream", |
7adf0260 | 208 | __FILE__, __PRETTY_FUNCTION__, |
8bfb8b67 | 209 | up->sg_str); |
12e41d03 DL |
210 | /* warning only */ |
211 | } | |
212 | ||
213 | /* detect change in pim_nexthop */ | |
214 | if (nexthop_mismatch(&rpf->source_nexthop, &save_nexthop)) { | |
215 | ||
ff67a923 | 216 | if (PIM_DEBUG_ZEBRA) { |
eaa54bdb | 217 | char nhaddr_str[PREFIX_STRLEN]; |
63c59d0c | 218 | pim_addr_dump("<addr?>", &rpf->source_nexthop.mrib_nexthop_addr, nhaddr_str, sizeof(nhaddr_str)); |
05e451f8 | 219 | zlog_debug("%s %s: (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d", |
12e41d03 | 220 | __FILE__, __PRETTY_FUNCTION__, |
8bfb8b67 | 221 | up->sg_str, |
12e41d03 DL |
222 | rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<ifname?>", |
223 | nhaddr_str, | |
224 | rpf->source_nexthop.mrib_metric_preference, | |
225 | rpf->source_nexthop.mrib_route_metric); | |
12e41d03 DL |
226 | } |
227 | ||
228 | pim_upstream_update_join_desired(up); | |
229 | pim_upstream_update_could_assert(up); | |
230 | pim_upstream_update_my_assert_metric(up); | |
231 | } | |
232 | ||
233 | /* detect change in RPF_interface(S) */ | |
234 | if (save_nexthop.interface != rpf->source_nexthop.interface) { | |
235 | ||
ff67a923 | 236 | if (PIM_DEBUG_ZEBRA) { |
05e451f8 | 237 | zlog_debug("%s %s: (S,G)=%s RPF_interface(S) changed from %s to %s", |
12e41d03 | 238 | __FILE__, __PRETTY_FUNCTION__, |
8bfb8b67 | 239 | up->sg_str, |
12e41d03 DL |
240 | save_nexthop.interface ? save_nexthop.interface->name : "<oldif?>", |
241 | rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<newif?>"); | |
242 | /* warning only */ | |
243 | } | |
244 | ||
245 | pim_upstream_rpf_interface_changed(up, save_nexthop.interface); | |
246 | } | |
247 | ||
248 | /* detect change in RPF'(S,G) */ | |
63c59d0c | 249 | if (save_rpf_addr.u.prefix4.s_addr != rpf->rpf_addr.u.prefix4.s_addr) { |
12e41d03 DL |
250 | |
251 | /* return old rpf to caller ? */ | |
252 | if (old_rpf_addr) | |
63c59d0c | 253 | *old_rpf_addr = save_rpf_addr.u.prefix4; |
12e41d03 DL |
254 | |
255 | return PIM_RPF_CHANGED; | |
256 | } | |
257 | ||
258 | return PIM_RPF_OK; | |
259 | } | |
260 | ||
261 | /* | |
262 | RFC 4601: 4.1.6. State Summarization Macros | |
263 | ||
264 | neighbor RPF'(S,G) { | |
265 | if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) { | |
266 | return AssertWinner(S, G, RPF_interface(S) ) | |
267 | } else { | |
268 | return NBR( RPF_interface(S), MRIB.next_hop( S ) ) | |
269 | } | |
270 | } | |
271 | ||
272 | RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data | |
273 | packets should be coming and to which joins should be sent on the RP | |
274 | tree and SPT, respectively. | |
275 | */ | |
276 | static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up) | |
277 | { | |
278 | struct pim_ifchannel *rpf_ch; | |
279 | struct pim_neighbor *neigh; | |
280 | struct in_addr rpf_addr; | |
281 | ||
282 | if (!up->rpf.source_nexthop.interface) { | |
05e451f8 | 283 | zlog_warn("%s: missing RPF interface for upstream (S,G)=%s", |
12e41d03 | 284 | __PRETTY_FUNCTION__, |
8bfb8b67 | 285 | up->sg_str); |
12e41d03 DL |
286 | |
287 | rpf_addr.s_addr = PIM_NET_INADDR_ANY; | |
288 | return rpf_addr; | |
289 | } | |
290 | ||
291 | rpf_ch = pim_ifchannel_find(up->rpf.source_nexthop.interface, | |
5074a423 | 292 | &up->sg); |
12e41d03 DL |
293 | if (rpf_ch) { |
294 | if (rpf_ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) { | |
295 | return rpf_ch->ifassert_winner; | |
296 | } | |
297 | } | |
298 | ||
299 | /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */ | |
300 | ||
301 | neigh = pim_if_find_neighbor(up->rpf.source_nexthop.interface, | |
63c59d0c | 302 | up->rpf.source_nexthop.mrib_nexthop_addr.u.prefix4); |
12e41d03 DL |
303 | if (neigh) |
304 | rpf_addr = neigh->source_addr; | |
305 | else | |
306 | rpf_addr.s_addr = PIM_NET_INADDR_ANY; | |
307 | ||
308 | return rpf_addr; | |
309 | } | |
63c59d0c DS |
310 | |
311 | int | |
312 | pim_rpf_addr_is_inaddr_none (struct pim_rpf *rpf) | |
313 | { | |
314 | switch (rpf->rpf_addr.family) | |
315 | { | |
fa8da98c | 316 | case AF_INET: |
63c59d0c DS |
317 | return rpf->rpf_addr.u.prefix4.s_addr == INADDR_NONE; |
318 | break; | |
fa8da98c | 319 | case AF_INET6: |
63c59d0c DS |
320 | zlog_warn ("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__); |
321 | return 1; | |
322 | break; | |
323 | default: | |
324 | return 0; | |
325 | break; | |
326 | } | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | int | |
332 | pim_rpf_addr_is_inaddr_any (struct pim_rpf *rpf) | |
333 | { | |
334 | switch (rpf->rpf_addr.family) | |
335 | { | |
fa8da98c | 336 | case AF_INET: |
63c59d0c DS |
337 | return rpf->rpf_addr.u.prefix4.s_addr == INADDR_ANY; |
338 | break; | |
fa8da98c | 339 | case AF_INET6: |
63c59d0c DS |
340 | zlog_warn ("%s: v6 Unimplmented", __PRETTY_FUNCTION__); |
341 | return 1; | |
342 | break; | |
343 | default: | |
344 | return 0; | |
345 | break; | |
346 | } | |
347 | ||
348 | return 0; | |
349 | } | |
66cc32fa DS |
350 | |
351 | int | |
352 | pim_rpf_is_same (struct pim_rpf *rpf1, struct pim_rpf *rpf2) | |
353 | { | |
354 | if (rpf1->source_nexthop.interface == rpf2->source_nexthop.interface) | |
355 | return 1; | |
356 | ||
357 | return 0; | |
358 | } |