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 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 pim_nexthop_cache pnc
;
205 struct prefix src
, grp
;
206 bool neigh_needed
= true;
208 saved
.source_nexthop
= rpf
->source_nexthop
;
209 saved
.rpf_addr
= rpf
->rpf_addr
;
211 if (is_new
&& PIM_DEBUG_ZEBRA
) {
212 char source_str
[INET_ADDRSTRLEN
];
213 pim_inet4_dump("<source?>", up
->upstream_addr
, source_str
,
215 zlog_debug("%s: NHT Register upstream %s addr %s with Zebra.",
216 __PRETTY_FUNCTION__
, up
->sg_str
, source_str
);
218 /* Register addr with Zebra NHT */
219 nht_p
.family
= AF_INET
;
220 nht_p
.prefixlen
= IPV4_MAX_BITLEN
;
221 nht_p
.u
.prefix4
.s_addr
= up
->upstream_addr
.s_addr
;
223 src
.family
= AF_INET
;
224 src
.prefixlen
= IPV4_MAX_BITLEN
;
225 src
.u
.prefix4
= up
->upstream_addr
; // RP or Src address
226 grp
.family
= AF_INET
;
227 grp
.prefixlen
= IPV4_MAX_BITLEN
;
228 grp
.u
.prefix4
= up
->sg
.grp
;
229 memset(&pnc
, 0, sizeof(struct pim_nexthop_cache
));
231 if ((up
->sg
.src
.s_addr
== INADDR_ANY
&& I_am_RP(pim
, up
->sg
.grp
)) ||
232 PIM_UPSTREAM_FLAG_TEST_FHR(up
->flags
))
233 neigh_needed
= FALSE
;
234 if (pim_find_or_track_nexthop(pim
, &nht_p
, up
, NULL
, &pnc
)) {
235 if (pnc
.nexthop_num
) {
236 if (!pim_ecmp_nexthop_search(pim
, &pnc
,
237 &up
->rpf
.source_nexthop
,
238 &src
, &grp
, neigh_needed
))
239 return PIM_RPF_FAILURE
;
242 if (!pim_ecmp_nexthop_lookup(pim
, &rpf
->source_nexthop
, &src
,
244 return PIM_RPF_FAILURE
;
247 rpf
->rpf_addr
.family
= AF_INET
;
248 rpf
->rpf_addr
.u
.prefix4
= pim_rpf_find_rpf_addr(up
);
249 if (pim_rpf_addr_is_inaddr_any(rpf
) && PIM_DEBUG_ZEBRA
) {
250 /* RPF'(S,G) not found */
251 zlog_debug("%s %s: RPF'%s not found: won't send join upstream",
252 __FILE__
, __PRETTY_FUNCTION__
, up
->sg_str
);
256 /* detect change in pim_nexthop */
257 if (nexthop_mismatch(&rpf
->source_nexthop
, &saved
.source_nexthop
)) {
259 if (PIM_DEBUG_ZEBRA
) {
260 char nhaddr_str
[PREFIX_STRLEN
];
261 pim_addr_dump("<addr?>",
262 &rpf
->source_nexthop
.mrib_nexthop_addr
,
263 nhaddr_str
, sizeof(nhaddr_str
));
264 zlog_debug("%s %s: (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d",
265 __FILE__
, __PRETTY_FUNCTION__
,
267 rpf
->source_nexthop
.interface
? rpf
->source_nexthop
.interface
->name
: "<ifname?>",
269 rpf
->source_nexthop
.mrib_metric_preference
,
270 rpf
->source_nexthop
.mrib_route_metric
);
273 pim_upstream_update_join_desired(pim
, up
);
274 pim_upstream_update_could_assert(up
);
275 pim_upstream_update_my_assert_metric(up
);
278 /* detect change in RPF_interface(S) */
279 if (saved
.source_nexthop
.interface
!= rpf
->source_nexthop
.interface
) {
281 if (PIM_DEBUG_ZEBRA
) {
282 zlog_debug("%s %s: (S,G)=%s RPF_interface(S) changed from %s to %s",
283 __FILE__
, __PRETTY_FUNCTION__
,
285 saved
.source_nexthop
.interface
? saved
.source_nexthop
.interface
->name
: "<oldif?>",
286 rpf
->source_nexthop
.interface
? rpf
->source_nexthop
.interface
->name
: "<newif?>");
290 pim_upstream_rpf_interface_changed(
291 up
, saved
.source_nexthop
.interface
);
294 /* detect change in RPF'(S,G) */
295 if (saved
.rpf_addr
.u
.prefix4
.s_addr
!= rpf
->rpf_addr
.u
.prefix4
.s_addr
296 || saved
.source_nexthop
297 .interface
!= rpf
->source_nexthop
.interface
) {
299 /* return old rpf to caller ? */
301 old
->source_nexthop
= saved
.source_nexthop
;
302 old
->rpf_addr
= saved
.rpf_addr
;
304 return PIM_RPF_CHANGED
;
311 RFC 4601: 4.1.6. State Summarization Macros
314 if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) {
315 return AssertWinner(S, G, RPF_interface(S) )
317 return NBR( RPF_interface(S), MRIB.next_hop( S ) )
321 RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data
322 packets should be coming and to which joins should be sent on the RP
323 tree and SPT, respectively.
325 static struct in_addr
pim_rpf_find_rpf_addr(struct pim_upstream
*up
)
327 struct pim_ifchannel
*rpf_ch
;
328 struct pim_neighbor
*neigh
;
329 struct in_addr rpf_addr
;
331 if (!up
->rpf
.source_nexthop
.interface
) {
332 zlog_warn("%s: missing RPF interface for upstream (S,G)=%s",
333 __PRETTY_FUNCTION__
, up
->sg_str
);
335 rpf_addr
.s_addr
= PIM_NET_INADDR_ANY
;
339 rpf_ch
= pim_ifchannel_find(up
->rpf
.source_nexthop
.interface
, &up
->sg
);
341 if (rpf_ch
->ifassert_state
== PIM_IFASSERT_I_AM_LOSER
) {
342 return rpf_ch
->ifassert_winner
;
346 /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */
348 neigh
= pim_if_find_neighbor(
349 up
->rpf
.source_nexthop
.interface
,
350 up
->rpf
.source_nexthop
.mrib_nexthop_addr
.u
.prefix4
);
352 rpf_addr
= neigh
->source_addr
;
354 rpf_addr
.s_addr
= PIM_NET_INADDR_ANY
;
359 int pim_rpf_addr_is_inaddr_none(struct pim_rpf
*rpf
)
361 switch (rpf
->rpf_addr
.family
) {
363 return rpf
->rpf_addr
.u
.prefix4
.s_addr
== INADDR_NONE
;
366 zlog_warn("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__
);
377 int pim_rpf_addr_is_inaddr_any(struct pim_rpf
*rpf
)
379 switch (rpf
->rpf_addr
.family
) {
381 return rpf
->rpf_addr
.u
.prefix4
.s_addr
== INADDR_ANY
;
384 zlog_warn("%s: v6 Unimplmented", __PRETTY_FUNCTION__
);
395 int pim_rpf_is_same(struct pim_rpf
*rpf1
, struct pim_rpf
*rpf2
)
397 if (rpf1
->source_nexthop
.interface
== rpf2
->source_nexthop
.interface
)
403 unsigned int pim_rpf_hash_key(void *arg
)
405 struct pim_nexthop_cache
*r
= (struct pim_nexthop_cache
*)arg
;
407 return jhash_1word(r
->rpf
.rpf_addr
.u
.prefix4
.s_addr
, 0);
410 bool pim_rpf_equal(const void *arg1
, const void *arg2
)
412 const struct pim_nexthop_cache
*r1
=
413 (const struct pim_nexthop_cache
*)arg1
;
414 const struct pim_nexthop_cache
*r2
=
415 (const struct pim_nexthop_cache
*)arg2
;
417 return prefix_same(&r1
->rpf
.rpf_addr
, &r2
->rpf
.rpf_addr
);