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_zlookup.h"
35 #include "pim_ifchannel.h"
40 static struct in_addr
pim_rpf_find_rpf_addr(struct pim_upstream
*up
);
42 void pim_rpf_set_refresh_time(struct pim_instance
*pim
)
44 pim
->last_route_change_time
= pim_time_monotonic_usec();
46 zlog_debug("%s: vrf(%s) New last route change time: %" PRId64
,
47 __PRETTY_FUNCTION__
, pim
->vrf
->name
,
48 pim
->last_route_change_time
);
51 bool pim_nexthop_lookup(struct pim_instance
*pim
, struct pim_nexthop
*nexthop
,
52 struct in_addr addr
, int neighbor_needed
)
54 struct pim_zlookup_nexthop nexthop_tab
[MULTIPATH_NUM
];
55 struct pim_neighbor
*nbr
= NULL
;
57 struct interface
*ifp
= NULL
;
58 ifindex_t first_ifindex
= 0;
63 * We should not attempt to lookup a
64 * 255.255.255.255 address, since
67 if (addr
.s_addr
== INADDR_NONE
)
70 if ((nexthop
->last_lookup
.s_addr
== addr
.s_addr
)
71 && (nexthop
->last_lookup_time
> pim
->last_route_change_time
)) {
72 if (PIM_DEBUG_TRACE
) {
73 char addr_str
[INET_ADDRSTRLEN
];
74 pim_inet4_dump("<addr?>", addr
, addr_str
,
76 char nexthop_str
[PREFIX_STRLEN
];
77 pim_addr_dump("<nexthop?>", &nexthop
->mrib_nexthop_addr
,
78 nexthop_str
, sizeof(nexthop_str
));
80 "%s: Using last lookup for %s at %lld, %" PRId64
" addr %s",
81 __PRETTY_FUNCTION__
, addr_str
,
82 nexthop
->last_lookup_time
,
83 pim
->last_route_change_time
, nexthop_str
);
85 pim
->nexthop_lookups_avoided
++;
88 if (PIM_DEBUG_TRACE
) {
89 char addr_str
[INET_ADDRSTRLEN
];
90 pim_inet4_dump("<addr?>", addr
, addr_str
,
93 "%s: Looking up: %s, last lookup time: %lld, %" PRId64
,
94 __PRETTY_FUNCTION__
, addr_str
,
95 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__
, __PRETTY_FUNCTION__
, 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_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__
, __PRETTY_FUNCTION__
,
125 first_ifindex
, addr_str
);
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 __PRETTY_FUNCTION__
, ifp
->name
,
139 first_ifindex
, addr_str
);
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",
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__
, __PRETTY_FUNCTION__
, nexthop_str
,
169 addr_str
, 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 enum pim_rpf_result
pim_rpf_update(struct pim_instance
*pim
,
198 struct pim_upstream
*up
, struct pim_rpf
*old
)
200 struct pim_rpf
*rpf
= &up
->rpf
;
201 struct pim_rpf saved
;
203 struct prefix src
, grp
;
204 bool neigh_needed
= true;
206 if (PIM_UPSTREAM_FLAG_TEST_STATIC_IIF(up
->flags
))
209 if (up
->upstream_addr
.s_addr
== INADDR_ANY
) {
210 zlog_debug("%s: RP is not configured yet for %s",
211 __PRETTY_FUNCTION__
, up
->sg_str
);
215 saved
.source_nexthop
= rpf
->source_nexthop
;
216 saved
.rpf_addr
= rpf
->rpf_addr
;
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
;
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
;
229 if ((up
->sg
.src
.s_addr
== INADDR_ANY
&& I_am_RP(pim
, up
->sg
.grp
)) ||
230 PIM_UPSTREAM_FLAG_TEST_FHR(up
->flags
))
231 neigh_needed
= FALSE
;
232 pim_find_or_track_nexthop(pim
, &nht_p
, up
, NULL
, false, NULL
);
233 if (!pim_ecmp_nexthop_lookup(pim
, &rpf
->source_nexthop
, &src
, &grp
,
235 return PIM_RPF_FAILURE
;
237 rpf
->rpf_addr
.family
= AF_INET
;
238 rpf
->rpf_addr
.u
.prefix4
= pim_rpf_find_rpf_addr(up
);
239 if (pim_rpf_addr_is_inaddr_any(rpf
) && PIM_DEBUG_ZEBRA
) {
240 /* RPF'(S,G) not found */
241 zlog_debug("%s %s: RPF'%s not found: won't send join upstream",
242 __FILE__
, __PRETTY_FUNCTION__
, up
->sg_str
);
246 /* detect change in pim_nexthop */
247 if (nexthop_mismatch(&rpf
->source_nexthop
, &saved
.source_nexthop
)) {
249 if (PIM_DEBUG_ZEBRA
) {
250 char nhaddr_str
[PREFIX_STRLEN
];
251 pim_addr_dump("<addr?>",
252 &rpf
->source_nexthop
.mrib_nexthop_addr
,
253 nhaddr_str
, sizeof(nhaddr_str
));
254 zlog_debug("%s %s: (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d",
255 __FILE__
, __PRETTY_FUNCTION__
,
257 rpf
->source_nexthop
.interface
? rpf
->source_nexthop
.interface
->name
: "<ifname?>",
259 rpf
->source_nexthop
.mrib_metric_preference
,
260 rpf
->source_nexthop
.mrib_route_metric
);
263 pim_upstream_update_join_desired(pim
, up
);
264 pim_upstream_update_could_assert(up
);
265 pim_upstream_update_my_assert_metric(up
);
268 /* detect change in RPF_interface(S) */
269 if (saved
.source_nexthop
.interface
!= rpf
->source_nexthop
.interface
) {
271 if (PIM_DEBUG_ZEBRA
) {
272 zlog_debug("%s %s: (S,G)=%s RPF_interface(S) changed from %s to %s",
273 __FILE__
, __PRETTY_FUNCTION__
,
275 saved
.source_nexthop
.interface
? saved
.source_nexthop
.interface
->name
: "<oldif?>",
276 rpf
->source_nexthop
.interface
? rpf
->source_nexthop
.interface
->name
: "<newif?>");
280 pim_upstream_rpf_interface_changed(
281 up
, saved
.source_nexthop
.interface
);
284 /* detect change in RPF'(S,G) */
285 if (saved
.rpf_addr
.u
.prefix4
.s_addr
!= rpf
->rpf_addr
.u
.prefix4
.s_addr
286 || saved
.source_nexthop
287 .interface
!= rpf
->source_nexthop
.interface
) {
289 /* return old rpf to caller ? */
291 old
->source_nexthop
= saved
.source_nexthop
;
292 old
->rpf_addr
= saved
.rpf_addr
;
294 return PIM_RPF_CHANGED
;
301 * In the case of RP deletion and RP unreachablity,
302 * uninstall the mroute in the kernel and clear the
303 * rpf information in the pim upstream and pim channel
304 * oil data structure.
306 void pim_upstream_rpf_clear(struct pim_instance
*pim
,
307 struct pim_upstream
*up
)
309 if (up
->rpf
.source_nexthop
.interface
) {
310 if (up
->channel_oil
) {
311 up
->channel_oil
->oil
.mfcc_parent
= MAXVIFS
;
312 pim_mroute_del(up
->channel_oil
, __PRETTY_FUNCTION__
);
315 pim_upstream_switch(pim
, up
, PIM_UPSTREAM_NOTJOINED
);
316 up
->rpf
.source_nexthop
.interface
= NULL
;
317 up
->rpf
.source_nexthop
.mrib_nexthop_addr
.u
.prefix4
.s_addr
=
319 up
->rpf
.source_nexthop
.mrib_metric_preference
=
320 router
->infinite_assert_metric
.metric_preference
;
321 up
->rpf
.source_nexthop
.mrib_route_metric
=
322 router
->infinite_assert_metric
.route_metric
;
323 up
->rpf
.rpf_addr
.u
.prefix4
.s_addr
= PIM_NET_INADDR_ANY
;
328 RFC 4601: 4.1.6. State Summarization Macros
331 if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) {
332 return AssertWinner(S, G, RPF_interface(S) )
334 return NBR( RPF_interface(S), MRIB.next_hop( S ) )
338 RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data
339 packets should be coming and to which joins should be sent on the RP
340 tree and SPT, respectively.
342 static struct in_addr
pim_rpf_find_rpf_addr(struct pim_upstream
*up
)
344 struct pim_ifchannel
*rpf_ch
;
345 struct pim_neighbor
*neigh
;
346 struct in_addr rpf_addr
;
348 if (!up
->rpf
.source_nexthop
.interface
) {
349 zlog_warn("%s: missing RPF interface for upstream (S,G)=%s",
350 __PRETTY_FUNCTION__
, up
->sg_str
);
352 rpf_addr
.s_addr
= PIM_NET_INADDR_ANY
;
356 rpf_ch
= pim_ifchannel_find(up
->rpf
.source_nexthop
.interface
, &up
->sg
);
358 if (rpf_ch
->ifassert_state
== PIM_IFASSERT_I_AM_LOSER
) {
359 return rpf_ch
->ifassert_winner
;
363 /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */
365 neigh
= pim_if_find_neighbor(
366 up
->rpf
.source_nexthop
.interface
,
367 up
->rpf
.source_nexthop
.mrib_nexthop_addr
.u
.prefix4
);
369 rpf_addr
= neigh
->source_addr
;
371 rpf_addr
.s_addr
= PIM_NET_INADDR_ANY
;
376 int pim_rpf_addr_is_inaddr_none(struct pim_rpf
*rpf
)
378 switch (rpf
->rpf_addr
.family
) {
380 return rpf
->rpf_addr
.u
.prefix4
.s_addr
== INADDR_NONE
;
383 zlog_warn("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__
);
394 int pim_rpf_addr_is_inaddr_any(struct pim_rpf
*rpf
)
396 switch (rpf
->rpf_addr
.family
) {
398 return rpf
->rpf_addr
.u
.prefix4
.s_addr
== INADDR_ANY
;
401 zlog_warn("%s: v6 Unimplmented", __PRETTY_FUNCTION__
);
412 int pim_rpf_is_same(struct pim_rpf
*rpf1
, struct pim_rpf
*rpf2
)
414 if (rpf1
->source_nexthop
.interface
== rpf2
->source_nexthop
.interface
)
420 unsigned int pim_rpf_hash_key(const void *arg
)
422 const struct pim_nexthop_cache
*r
= arg
;
424 return jhash_1word(r
->rpf
.rpf_addr
.u
.prefix4
.s_addr
, 0);
427 bool pim_rpf_equal(const void *arg1
, const void *arg2
)
429 const struct pim_nexthop_cache
*r1
=
430 (const struct pim_nexthop_cache
*)arg1
;
431 const struct pim_nexthop_cache
*r2
=
432 (const struct pim_nexthop_cache
*)arg2
;
434 return prefix_same(&r1
->rpf
.rpf_addr
, &r2
->rpf
.rpf_addr
);