3 * Copyright (C) 2008 Everton da Silva Marques
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.
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.
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
33 #include "pim_iface.h"
34 #include "pim_neighbor.h"
35 #include "pim_zlookup.h"
36 #include "pim_ifchannel.h"
42 static struct in_addr
pim_rpf_find_rpf_addr(struct pim_upstream
*up
);
44 void pim_rpf_set_refresh_time(struct pim_instance
*pim
)
46 pim
->last_route_change_time
= pim_time_monotonic_usec();
47 if (PIM_DEBUG_PIM_TRACE
)
48 zlog_debug("%s: vrf(%s) New last route change time: %" PRId64
,
49 __func__
, pim
->vrf
->name
,
50 pim
->last_route_change_time
);
53 bool pim_nexthop_lookup(struct pim_instance
*pim
, struct pim_nexthop
*nexthop
,
54 struct in_addr addr
, int neighbor_needed
)
56 struct pim_zlookup_nexthop nexthop_tab
[MULTIPATH_NUM
];
57 struct pim_neighbor
*nbr
= NULL
;
59 struct interface
*ifp
= NULL
;
60 ifindex_t first_ifindex
= 0;
65 * We should not attempt to lookup a
66 * 255.255.255.255 address, since
69 if (addr
.s_addr
== INADDR_NONE
)
72 if ((nexthop
->last_lookup
.s_addr
== addr
.s_addr
)
73 && (nexthop
->last_lookup_time
> pim
->last_route_change_time
)) {
74 if (PIM_DEBUG_PIM_NHT
) {
75 char addr_str
[INET_ADDRSTRLEN
];
76 pim_inet4_dump("<addr?>", addr
, addr_str
,
78 char nexthop_str
[PREFIX_STRLEN
];
79 pim_addr_dump("<nexthop?>", &nexthop
->mrib_nexthop_addr
,
80 nexthop_str
, sizeof(nexthop_str
));
82 "%s: Using last lookup for %s at %lld, %" PRId64
" addr %s",
83 __func__
, addr_str
, nexthop
->last_lookup_time
,
84 pim
->last_route_change_time
, nexthop_str
);
86 pim
->nexthop_lookups_avoided
++;
89 if (PIM_DEBUG_PIM_NHT
) {
90 char addr_str
[INET_ADDRSTRLEN
];
91 pim_inet4_dump("<addr?>", addr
, addr_str
,
94 "%s: Looking up: %s, last lookup time: %lld, %" PRId64
,
95 __func__
, addr_str
, nexthop
->last_lookup_time
,
96 pim
->last_route_change_time
);
100 memset(nexthop_tab
, 0,
101 sizeof(struct pim_zlookup_nexthop
) * MULTIPATH_NUM
);
102 num_ifindex
= zclient_lookup_nexthop(pim
, nexthop_tab
, MULTIPATH_NUM
,
103 addr
, PIM_NEXTHOP_LOOKUP_MAX
);
104 if (num_ifindex
< 1) {
105 char addr_str
[INET_ADDRSTRLEN
];
106 pim_inet4_dump("<addr?>", addr
, addr_str
, sizeof(addr_str
));
108 "%s %s: could not find nexthop ifindex for address %s",
109 __FILE__
, __func__
, addr_str
);
113 while (!found
&& (i
< num_ifindex
)) {
114 first_ifindex
= nexthop_tab
[i
].ifindex
;
116 ifp
= if_lookup_by_index(first_ifindex
, pim
->vrf
->vrf_id
);
118 if (PIM_DEBUG_ZEBRA
) {
119 char addr_str
[INET_ADDRSTRLEN
];
120 pim_inet4_dump("<addr?>", addr
, addr_str
,
123 "%s %s: could not find interface for ifindex %d (address %s)",
124 __FILE__
, __func__
, first_ifindex
,
132 if (PIM_DEBUG_ZEBRA
) {
133 char addr_str
[INET_ADDRSTRLEN
];
134 pim_inet4_dump("<addr?>", addr
, addr_str
,
137 "%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)",
138 __func__
, ifp
->name
, first_ifindex
,
142 } else if (neighbor_needed
143 && !pim_if_connected_to_source(ifp
, addr
)) {
144 nbr
= pim_neighbor_find_prefix(
145 ifp
, &nexthop_tab
[i
].nexthop_addr
);
146 if (PIM_DEBUG_PIM_TRACE_DETAIL
)
147 zlog_debug("ifp name: %s, pim nbr: %p",
149 if (!nbr
&& !if_is_loopback(ifp
))
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
,
167 "%s %s: found nexthop %s for address %s: interface %s ifindex=%d metric=%d pref=%d",
168 __FILE__
, __func__
, nexthop_str
, addr_str
,
169 ifp
->name
, first_ifindex
,
170 nexthop_tab
[i
].route_metric
,
171 nexthop_tab
[i
].protocol_distance
);
173 /* update nexthop 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();
187 static int nexthop_mismatch(const struct pim_nexthop
*nh1
,
188 const struct pim_nexthop
*nh2
)
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
);
197 static void pim_rpf_cost_change(struct pim_instance
*pim
,
198 struct pim_upstream
*up
, uint32_t old_cost
)
200 struct pim_rpf
*rpf
= &up
->rpf
;
203 new_cost
= pim_up_mlag_local_cost(up
);
206 "%s: Cost_to_rp of upstream-%s changed to:%u, from:%u",
207 __func__
, up
->sg_str
, new_cost
, old_cost
);
209 if (old_cost
== new_cost
)
212 /* Cost changed, it might Impact MLAG DF election, update */
215 "%s: Cost_to_rp of upstream-%s changed to:%u",
216 __func__
, up
->sg_str
,
217 rpf
->source_nexthop
.mrib_route_metric
);
219 if (pim_up_mlag_is_local(up
))
220 pim_mlag_up_local_add(pim
, up
);
223 enum pim_rpf_result
pim_rpf_update(struct pim_instance
*pim
,
224 struct pim_upstream
*up
, struct pim_rpf
*old
,
227 struct pim_rpf
*rpf
= &up
->rpf
;
228 struct pim_rpf saved
;
230 struct prefix src
, grp
;
231 bool neigh_needed
= true;
232 uint32_t saved_mrib_route_metric
;
234 if (PIM_UPSTREAM_FLAG_TEST_STATIC_IIF(up
->flags
))
237 if (up
->upstream_addr
.s_addr
== INADDR_ANY
) {
238 zlog_debug("%s(%s): RP is not configured yet for %s",
239 __func__
, caller
, up
->sg_str
);
243 saved
.source_nexthop
= rpf
->source_nexthop
;
244 saved
.rpf_addr
= rpf
->rpf_addr
;
245 saved_mrib_route_metric
= pim_up_mlag_local_cost(up
);
247 old
->source_nexthop
= saved
.source_nexthop
;
248 old
->rpf_addr
= saved
.rpf_addr
;
251 nht_p
.family
= AF_INET
;
252 nht_p
.prefixlen
= IPV4_MAX_BITLEN
;
253 nht_p
.u
.prefix4
.s_addr
= up
->upstream_addr
.s_addr
;
255 src
.family
= AF_INET
;
256 src
.prefixlen
= IPV4_MAX_BITLEN
;
257 src
.u
.prefix4
= up
->upstream_addr
; // RP or Src address
258 pim_addr_to_prefix(&grp
, up
->sg
.grp
);
260 if ((pim_addr_is_any(up
->sg
.src
) && I_am_RP(pim
, up
->sg
.grp
)) ||
261 PIM_UPSTREAM_FLAG_TEST_FHR(up
->flags
))
262 neigh_needed
= false;
263 pim_find_or_track_nexthop(pim
, &nht_p
, up
, NULL
, NULL
);
264 if (!pim_ecmp_nexthop_lookup(pim
, &rpf
->source_nexthop
, &src
, &grp
,
266 /* Route is Deleted in Zebra, reset the stored NH data */
267 pim_upstream_rpf_clear(pim
, up
);
268 pim_rpf_cost_change(pim
, up
, saved_mrib_route_metric
);
269 return PIM_RPF_FAILURE
;
272 rpf
->rpf_addr
.family
= AF_INET
;
273 rpf
->rpf_addr
.u
.prefix4
= pim_rpf_find_rpf_addr(up
);
274 if (pim_rpf_addr_is_inaddr_any(rpf
) && PIM_DEBUG_ZEBRA
) {
275 /* RPF'(S,G) not found */
276 zlog_debug("%s(%s): RPF'%s not found: won't send join upstream",
277 __func__
, caller
, up
->sg_str
);
281 /* detect change in pim_nexthop */
282 if (nexthop_mismatch(&rpf
->source_nexthop
, &saved
.source_nexthop
)) {
284 if (PIM_DEBUG_ZEBRA
) {
285 char nhaddr_str
[PREFIX_STRLEN
];
286 pim_addr_dump("<addr?>",
287 &rpf
->source_nexthop
.mrib_nexthop_addr
,
288 nhaddr_str
, sizeof(nhaddr_str
));
289 zlog_debug("%s(%s): (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d",
292 rpf
->source_nexthop
.interface
? rpf
->source_nexthop
.interface
->name
: "<ifname?>",
294 rpf
->source_nexthop
.mrib_metric_preference
,
295 rpf
->source_nexthop
.mrib_route_metric
);
298 pim_upstream_update_join_desired(pim
, up
);
299 pim_upstream_update_could_assert(up
);
300 pim_upstream_update_my_assert_metric(up
);
303 /* detect change in RPF_interface(S) */
304 if (saved
.source_nexthop
.interface
!= rpf
->source_nexthop
.interface
) {
306 if (PIM_DEBUG_ZEBRA
) {
307 zlog_debug("%s(%s): (S,G)=%s RPF_interface(S) changed from %s to %s",
310 saved
.source_nexthop
.interface
? saved
.source_nexthop
.interface
->name
: "<oldif?>",
311 rpf
->source_nexthop
.interface
? rpf
->source_nexthop
.interface
->name
: "<newif?>");
315 pim_upstream_rpf_interface_changed(
316 up
, saved
.source_nexthop
.interface
);
319 /* detect change in RPF'(S,G) */
320 if (saved
.rpf_addr
.u
.prefix4
.s_addr
!= rpf
->rpf_addr
.u
.prefix4
.s_addr
321 || saved
.source_nexthop
322 .interface
!= rpf
->source_nexthop
.interface
) {
323 pim_rpf_cost_change(pim
, up
, saved_mrib_route_metric
);
324 return PIM_RPF_CHANGED
;
329 "%s(%s): Cost_to_rp of upstream-%s changed to:%u",
330 __func__
, caller
, up
->sg_str
,
331 rpf
->source_nexthop
.mrib_route_metric
);
333 pim_rpf_cost_change(pim
, up
, saved_mrib_route_metric
);
339 * In the case of RP deletion and RP unreachablity,
340 * uninstall the mroute in the kernel and clear the
341 * rpf information in the pim upstream and pim channel
342 * oil data structure.
344 void pim_upstream_rpf_clear(struct pim_instance
*pim
,
345 struct pim_upstream
*up
)
347 if (up
->rpf
.source_nexthop
.interface
) {
348 pim_upstream_switch(pim
, up
, PIM_UPSTREAM_NOTJOINED
);
349 up
->rpf
.source_nexthop
.interface
= NULL
;
350 up
->rpf
.source_nexthop
.mrib_nexthop_addr
.u
.prefix4
.s_addr
=
352 up
->rpf
.source_nexthop
.mrib_metric_preference
=
353 router
->infinite_assert_metric
.metric_preference
;
354 up
->rpf
.source_nexthop
.mrib_route_metric
=
355 router
->infinite_assert_metric
.route_metric
;
356 up
->rpf
.rpf_addr
.u
.prefix4
.s_addr
= PIM_NET_INADDR_ANY
;
357 pim_upstream_mroute_iif_update(up
->channel_oil
, __func__
);
362 RFC 4601: 4.1.6. State Summarization Macros
365 if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) {
366 return AssertWinner(S, G, RPF_interface(S) )
368 return NBR( RPF_interface(S), MRIB.next_hop( S ) )
372 RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data
373 packets should be coming and to which joins should be sent on the RP
374 tree and SPT, respectively.
376 static struct in_addr
pim_rpf_find_rpf_addr(struct pim_upstream
*up
)
378 struct pim_ifchannel
*rpf_ch
;
379 struct pim_neighbor
*neigh
;
380 struct in_addr rpf_addr
;
382 if (!up
->rpf
.source_nexthop
.interface
) {
383 zlog_warn("%s: missing RPF interface for upstream (S,G)=%s",
384 __func__
, up
->sg_str
);
386 rpf_addr
.s_addr
= PIM_NET_INADDR_ANY
;
390 rpf_ch
= pim_ifchannel_find(up
->rpf
.source_nexthop
.interface
, &up
->sg
);
392 if (rpf_ch
->ifassert_state
== PIM_IFASSERT_I_AM_LOSER
) {
393 return rpf_ch
->ifassert_winner
;
397 /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */
402 pim_addr_from_prefix(&up
->rpf
.source_nexthop
.mrib_nexthop_addr
);
403 neigh
= pim_if_find_neighbor(up
->rpf
.source_nexthop
.interface
, nhaddr
);
405 rpf_addr
= neigh
->source_addr
;
407 rpf_addr
.s_addr
= PIM_NET_INADDR_ANY
;
412 int pim_rpf_addr_is_inaddr_none(struct pim_rpf
*rpf
)
414 switch (rpf
->rpf_addr
.family
) {
416 return rpf
->rpf_addr
.u
.prefix4
.s_addr
== INADDR_NONE
;
418 zlog_warn("%s: v6 Unimplmeneted", __func__
);
425 int pim_rpf_addr_is_inaddr_any(struct pim_rpf
*rpf
)
427 switch (rpf
->rpf_addr
.family
) {
429 return rpf
->rpf_addr
.u
.prefix4
.s_addr
== INADDR_ANY
;
431 zlog_warn("%s: v6 Unimplmented", __func__
);
438 int pim_rpf_is_same(struct pim_rpf
*rpf1
, struct pim_rpf
*rpf2
)
440 if (rpf1
->source_nexthop
.interface
== rpf2
->source_nexthop
.interface
)
446 unsigned int pim_rpf_hash_key(const void *arg
)
448 const struct pim_nexthop_cache
*r
= arg
;
450 return jhash_1word(r
->rpf
.rpf_addr
.u
.prefix4
.s_addr
, 0);
453 bool pim_rpf_equal(const void *arg1
, const void *arg2
)
455 const struct pim_nexthop_cache
*r1
=
456 (const struct pim_nexthop_cache
*)arg1
;
457 const struct pim_nexthop_cache
*r2
=
458 (const struct pim_nexthop_cache
*)arg2
;
460 return prefix_same(&r1
->rpf
.rpf_addr
, &r2
->rpf
.rpf_addr
);