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();
45 if (PIM_DEBUG_PIM_TRACE
)
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_PIM_NHT
) {
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_PIM_NHT
) {
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
,
201 struct pim_rpf
*rpf
= &up
->rpf
;
202 struct pim_rpf saved
;
204 struct prefix src
, grp
;
205 bool neigh_needed
= true;
207 if (PIM_UPSTREAM_FLAG_TEST_STATIC_IIF(up
->flags
))
210 if (up
->upstream_addr
.s_addr
== INADDR_ANY
) {
211 zlog_debug("%s(%s): RP is not configured yet for %s",
212 __func__
, caller
, up
->sg_str
);
216 saved
.source_nexthop
= rpf
->source_nexthop
;
217 saved
.rpf_addr
= rpf
->rpf_addr
;
219 old
->source_nexthop
= saved
.source_nexthop
;
220 old
->rpf_addr
= saved
.rpf_addr
;
223 nht_p
.family
= AF_INET
;
224 nht_p
.prefixlen
= IPV4_MAX_BITLEN
;
225 nht_p
.u
.prefix4
.s_addr
= up
->upstream_addr
.s_addr
;
227 src
.family
= AF_INET
;
228 src
.prefixlen
= IPV4_MAX_BITLEN
;
229 src
.u
.prefix4
= up
->upstream_addr
; // RP or Src address
230 grp
.family
= AF_INET
;
231 grp
.prefixlen
= IPV4_MAX_BITLEN
;
232 grp
.u
.prefix4
= up
->sg
.grp
;
234 if ((up
->sg
.src
.s_addr
== INADDR_ANY
&& I_am_RP(pim
, up
->sg
.grp
)) ||
235 PIM_UPSTREAM_FLAG_TEST_FHR(up
->flags
))
236 neigh_needed
= false;
237 pim_find_or_track_nexthop(pim
, &nht_p
, up
, NULL
, false, NULL
);
238 if (!pim_ecmp_nexthop_lookup(pim
, &rpf
->source_nexthop
, &src
, &grp
,
240 return PIM_RPF_FAILURE
;
242 rpf
->rpf_addr
.family
= AF_INET
;
243 rpf
->rpf_addr
.u
.prefix4
= pim_rpf_find_rpf_addr(up
);
244 if (pim_rpf_addr_is_inaddr_any(rpf
) && PIM_DEBUG_ZEBRA
) {
245 /* RPF'(S,G) not found */
246 zlog_debug("%s(%s): RPF'%s not found: won't send join upstream",
247 __func__
, caller
, up
->sg_str
);
251 /* detect change in pim_nexthop */
252 if (nexthop_mismatch(&rpf
->source_nexthop
, &saved
.source_nexthop
)) {
254 if (PIM_DEBUG_ZEBRA
) {
255 char nhaddr_str
[PREFIX_STRLEN
];
256 pim_addr_dump("<addr?>",
257 &rpf
->source_nexthop
.mrib_nexthop_addr
,
258 nhaddr_str
, sizeof(nhaddr_str
));
259 zlog_debug("%s(%s): (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d",
262 rpf
->source_nexthop
.interface
? rpf
->source_nexthop
.interface
->name
: "<ifname?>",
264 rpf
->source_nexthop
.mrib_metric_preference
,
265 rpf
->source_nexthop
.mrib_route_metric
);
268 pim_upstream_update_join_desired(pim
, up
);
269 pim_upstream_update_could_assert(up
);
270 pim_upstream_update_my_assert_metric(up
);
273 /* detect change in RPF_interface(S) */
274 if (saved
.source_nexthop
.interface
!= rpf
->source_nexthop
.interface
) {
276 if (PIM_DEBUG_ZEBRA
) {
277 zlog_debug("%s(%s): (S,G)=%s RPF_interface(S) changed from %s to %s",
280 saved
.source_nexthop
.interface
? saved
.source_nexthop
.interface
->name
: "<oldif?>",
281 rpf
->source_nexthop
.interface
? rpf
->source_nexthop
.interface
->name
: "<newif?>");
285 pim_upstream_rpf_interface_changed(
286 up
, saved
.source_nexthop
.interface
);
289 /* detect change in RPF'(S,G) */
290 if (saved
.rpf_addr
.u
.prefix4
.s_addr
!= rpf
->rpf_addr
.u
.prefix4
.s_addr
291 || saved
.source_nexthop
292 .interface
!= rpf
->source_nexthop
.interface
) {
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 up
->rpf
.source_nexthop
.interface
= NULL
;
311 up
->rpf
.source_nexthop
.mrib_nexthop_addr
.u
.prefix4
.s_addr
=
313 up
->rpf
.source_nexthop
.mrib_metric_preference
=
314 router
->infinite_assert_metric
.metric_preference
;
315 up
->rpf
.source_nexthop
.mrib_route_metric
=
316 router
->infinite_assert_metric
.route_metric
;
317 up
->rpf
.rpf_addr
.u
.prefix4
.s_addr
= PIM_NET_INADDR_ANY
;
318 pim_upstream_mroute_iif_update(up
->channel_oil
, __func__
);
323 RFC 4601: 4.1.6. State Summarization Macros
326 if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) {
327 return AssertWinner(S, G, RPF_interface(S) )
329 return NBR( RPF_interface(S), MRIB.next_hop( S ) )
333 RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data
334 packets should be coming and to which joins should be sent on the RP
335 tree and SPT, respectively.
337 static struct in_addr
pim_rpf_find_rpf_addr(struct pim_upstream
*up
)
339 struct pim_ifchannel
*rpf_ch
;
340 struct pim_neighbor
*neigh
;
341 struct in_addr rpf_addr
;
343 if (!up
->rpf
.source_nexthop
.interface
) {
344 zlog_warn("%s: missing RPF interface for upstream (S,G)=%s",
345 __PRETTY_FUNCTION__
, up
->sg_str
);
347 rpf_addr
.s_addr
= PIM_NET_INADDR_ANY
;
351 rpf_ch
= pim_ifchannel_find(up
->rpf
.source_nexthop
.interface
, &up
->sg
);
353 if (rpf_ch
->ifassert_state
== PIM_IFASSERT_I_AM_LOSER
) {
354 return rpf_ch
->ifassert_winner
;
358 /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */
360 neigh
= pim_if_find_neighbor(
361 up
->rpf
.source_nexthop
.interface
,
362 up
->rpf
.source_nexthop
.mrib_nexthop_addr
.u
.prefix4
);
364 rpf_addr
= neigh
->source_addr
;
366 rpf_addr
.s_addr
= PIM_NET_INADDR_ANY
;
371 int pim_rpf_addr_is_inaddr_none(struct pim_rpf
*rpf
)
373 switch (rpf
->rpf_addr
.family
) {
375 return rpf
->rpf_addr
.u
.prefix4
.s_addr
== INADDR_NONE
;
378 zlog_warn("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__
);
389 int pim_rpf_addr_is_inaddr_any(struct pim_rpf
*rpf
)
391 switch (rpf
->rpf_addr
.family
) {
393 return rpf
->rpf_addr
.u
.prefix4
.s_addr
== INADDR_ANY
;
396 zlog_warn("%s: v6 Unimplmented", __PRETTY_FUNCTION__
);
407 int pim_rpf_is_same(struct pim_rpf
*rpf1
, struct pim_rpf
*rpf2
)
409 if (rpf1
->source_nexthop
.interface
== rpf2
->source_nexthop
.interface
)
415 unsigned int pim_rpf_hash_key(const void *arg
)
417 const struct pim_nexthop_cache
*r
= arg
;
419 return jhash_1word(r
->rpf
.rpf_addr
.u
.prefix4
.s_addr
, 0);
422 bool pim_rpf_equal(const void *arg1
, const void *arg2
)
424 const struct pim_nexthop_cache
*r1
=
425 (const struct pim_nexthop_cache
*)arg1
;
426 const struct pim_nexthop_cache
*r2
=
427 (const struct pim_nexthop_cache
*)arg2
;
429 return prefix_same(&r1
->rpf
.rpf_addr
, &r2
->rpf
.rpf_addr
);