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 int 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 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();
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 pim_nexthop_cache pnc
;
205 struct prefix src
, grp
;
207 saved
.source_nexthop
= rpf
->source_nexthop
;
208 saved
.rpf_addr
= rpf
->rpf_addr
;
210 if (is_new
&& PIM_DEBUG_ZEBRA
) {
211 char source_str
[INET_ADDRSTRLEN
];
212 pim_inet4_dump("<source?>", up
->upstream_addr
, source_str
,
214 zlog_debug("%s: NHT Register upstream %s addr %s with Zebra.",
215 __PRETTY_FUNCTION__
, up
->sg_str
, source_str
);
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
;
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
));
229 if (pim_find_or_track_nexthop(pim
, &nht_p
, up
, NULL
, &pnc
)) {
230 if (pnc
.nexthop_num
) {
231 if (!pim_ecmp_nexthop_search(
232 pim
, &pnc
, &up
->rpf
.source_nexthop
, &src
,
234 !PIM_UPSTREAM_FLAG_TEST_FHR(up
->flags
)
235 && !PIM_UPSTREAM_FLAG_TEST_SRC_IGMP(
237 return PIM_RPF_FAILURE
;
240 if (!pim_ecmp_nexthop_lookup(
241 pim
, &rpf
->source_nexthop
, up
->upstream_addr
, &src
,
243 !PIM_UPSTREAM_FLAG_TEST_FHR(up
->flags
)
244 && !PIM_UPSTREAM_FLAG_TEST_SRC_IGMP(
246 return PIM_RPF_FAILURE
;
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
);
258 /* detect change in pim_nexthop */
259 if (nexthop_mismatch(&rpf
->source_nexthop
, &saved
.source_nexthop
)) {
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",
267 __FILE__
, __PRETTY_FUNCTION__
,
269 rpf
->source_nexthop
.interface
? rpf
->source_nexthop
.interface
->name
: "<ifname?>",
271 rpf
->source_nexthop
.mrib_metric_preference
,
272 rpf
->source_nexthop
.mrib_route_metric
);
275 pim_upstream_update_join_desired(pim
, up
);
276 pim_upstream_update_could_assert(up
);
277 pim_upstream_update_my_assert_metric(up
);
280 /* detect change in RPF_interface(S) */
281 if (saved
.source_nexthop
.interface
!= rpf
->source_nexthop
.interface
) {
283 if (PIM_DEBUG_ZEBRA
) {
284 zlog_debug("%s %s: (S,G)=%s RPF_interface(S) changed from %s to %s",
285 __FILE__
, __PRETTY_FUNCTION__
,
287 saved
.source_nexthop
.interface
? saved
.source_nexthop
.interface
->name
: "<oldif?>",
288 rpf
->source_nexthop
.interface
? rpf
->source_nexthop
.interface
->name
: "<newif?>");
292 pim_upstream_rpf_interface_changed(
293 up
, saved
.source_nexthop
.interface
);
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
) {
301 /* return old rpf to caller ? */
303 old
->source_nexthop
= saved
.source_nexthop
;
304 old
->rpf_addr
= saved
.rpf_addr
;
306 return PIM_RPF_CHANGED
;
313 RFC 4601: 4.1.6. State Summarization Macros
316 if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) {
317 return AssertWinner(S, G, RPF_interface(S) )
319 return NBR( RPF_interface(S), MRIB.next_hop( S ) )
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.
327 static struct in_addr
pim_rpf_find_rpf_addr(struct pim_upstream
*up
)
329 struct pim_ifchannel
*rpf_ch
;
330 struct pim_neighbor
*neigh
;
331 struct in_addr rpf_addr
;
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
);
337 rpf_addr
.s_addr
= PIM_NET_INADDR_ANY
;
341 rpf_ch
= pim_ifchannel_find(up
->rpf
.source_nexthop
.interface
, &up
->sg
);
343 if (rpf_ch
->ifassert_state
== PIM_IFASSERT_I_AM_LOSER
) {
344 return rpf_ch
->ifassert_winner
;
348 /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */
350 neigh
= pim_if_find_neighbor(
351 up
->rpf
.source_nexthop
.interface
,
352 up
->rpf
.source_nexthop
.mrib_nexthop_addr
.u
.prefix4
);
354 rpf_addr
= neigh
->source_addr
;
356 rpf_addr
.s_addr
= PIM_NET_INADDR_ANY
;
361 int pim_rpf_addr_is_inaddr_none(struct pim_rpf
*rpf
)
363 switch (rpf
->rpf_addr
.family
) {
365 return rpf
->rpf_addr
.u
.prefix4
.s_addr
== INADDR_NONE
;
368 zlog_warn("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__
);
379 int pim_rpf_addr_is_inaddr_any(struct pim_rpf
*rpf
)
381 switch (rpf
->rpf_addr
.family
) {
383 return rpf
->rpf_addr
.u
.prefix4
.s_addr
== INADDR_ANY
;
386 zlog_warn("%s: v6 Unimplmented", __PRETTY_FUNCTION__
);
397 int pim_rpf_is_same(struct pim_rpf
*rpf1
, struct pim_rpf
*rpf2
)
399 if (rpf1
->source_nexthop
.interface
== rpf2
->source_nexthop
.interface
)
405 unsigned int pim_rpf_hash_key(void *arg
)
407 struct pim_nexthop_cache
*r
= (struct pim_nexthop_cache
*)arg
;
409 return jhash_1word(r
->rpf
.rpf_addr
.u
.prefix4
.s_addr
, 0);
412 int pim_rpf_equal(const void *arg1
, const void *arg2
)
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
;
419 return prefix_same(&r1
->rpf
.rpf_addr
, &r2
->rpf
.rpf_addr
);