forked from troglobit/pimd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathroute.c
1065 lines (917 loc) · 30.4 KB
/
route.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (c) 1998-2001
* University of Southern California/Information Sciences Institute.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* $Id: route.c,v 1.39 2003/02/12 21:56:55 pavlin Exp $
*/
#include "defs.h"
/* Marian Stagarescu : 07/31/01:
*
* Administrative scoped multicast filtering im PIMD. This allows an
* interface to be configured as an administrative boundary for the
* specified scoped address. Packets belonging to the scoped address will
* not be forwarded.
*
* Please note the in order to minimize the search for the matching groups
* the implementation is limited to:
*
* Packets are stopped from being forwarded by installing a NULL outgoing
* interface; the user space (pimd) is not up-call-ed any more for
* these packets which are dropped by kernel (nil oif) except for
* when we de-install the route are re-create it (timer 3 minute).
* uses the VIF acl that was installed via config scoped statements.
*
* this is not an all-purpose packet filtering mechanism.
* we tried here to achieve the filtering with minimal processing
* (inspect (g) when we are about to install a route for it).
*
* to use it edit pimd.conf and compile with -DSCOPED_ACL
*/
static void process_cache_miss (struct igmpmsg *igmpctl);
static void process_wrong_iif (struct igmpmsg *igmpctl);
static void process_whole_pkt (char *buf);
uint32_t default_source_metric = UCAST_DEFAULT_SOURCE_METRIC;
uint32_t default_source_preference = UCAST_DEFAULT_SOURCE_PREFERENCE;
#ifdef SCOPED_ACL
/* from mrouted. Contributed by Marian Stagarescu <marian@bile.cidera.com>*/
static int scoped_addr(vifi_t vifi, uint32_t addr)
{
struct vif_acl *acl;
for (acl = uvifs[vifi].uv_acl; acl; acl = acl->acl_next) {
if ((addr & acl->acl_mask) == acl->acl_addr)
return 1;
}
return 0;
}
/* Contributed by Marian Stagarescu <marian@bile.cidera.com>
* adapted from mrouted: check for scoped multicast addresses
* install null oif if matched
*/
#define APPLY_SCOPE(g, mp) { \
vifi_t i; \
for (i = 0; i < numvifs; i++) \
if (scoped_addr(i, g)) \
(mp)->oifs = 0; \
}
#endif /* SCOPED_ACL */
/* Return the iif for given address */
vifi_t get_iif(uint32_t address)
{
struct rpfctl rpfc;
k_req_incoming(address, &rpfc);
if (rpfc.rpfneighbor.s_addr == INADDR_ANY_N)
return NO_VIF;
return rpfc.iif;
}
/* Return the PIM neighbor toward a source */
/* If route not found or if a local source or if a directly connected source,
* but is not PIM router, or if the first hop router is not a PIM router,
* then return NULL.
*/
pim_nbr_entry_t *find_pim_nbr(uint32_t source)
{
struct rpfctl rpfc;
pim_nbr_entry_t *nbr;
uint32_t addr;
if (local_address(source) != NO_VIF)
return NULL;
k_req_incoming(source, &rpfc);
if ((rpfc.rpfneighbor.s_addr == INADDR_ANY_N) || (rpfc.iif == NO_VIF))
return NULL;
/* Figure out the nexthop neighbor by checking the reverse path */
addr = rpfc.rpfneighbor.s_addr;
for (nbr = uvifs[rpfc.iif].uv_pim_neighbors; nbr; nbr = nbr->next)
if (nbr->address == addr)
return nbr;
return NULL;
}
/* TODO: check again the exact setup if the source is local or directly
* connected!!!
*/
/* TODO: XXX: change the metric and preference for all (S,G) entries per
* source or RP?
*/
/* TODO - If possible, this would be the place to correct set the
* source's preference and metric to that obtained from the kernel
* and/or unicast routing protocol. For now, set it to the configured
* default for local pref/metric.
*/
/*
* Set the iif, upstream router, preference and metric for the route
* toward the source. Return TRUE is the route was found, othewise FALSE.
* If type==PIM_IIF_SOURCE and if the source is directly connected
* then the "upstream" is set to NULL. If srcentry==PIM_IIF_RP, then
* "upstream" in case of directly connected "source" will be that "source"
* (if it is also PIM router).,
*/
int set_incoming(srcentry_t *src, int type)
{
struct rpfctl rpfc;
uint32_t src_addr = src->address;
uint32_t nbr_addr;
struct uvif *vif;
pim_nbr_entry_t *nbr;
/* Preference will be 0 if directly connected */
src->metric = 0;
src->preference = 0;
/* The source is a local address */
src->incoming = local_address(src_addr);
if (src->incoming != NO_VIF) {
/* iif of (*,G) at RP has to be register_if */
if (type == PIM_IIF_RP)
src->incoming = reg_vif_num;
/* TODO: set the upstream to myself? */
src->upstream = NULL;
return TRUE;
}
src->incoming = find_vif_direct(src_addr);
if (src->incoming != NO_VIF) {
/* The source is directly connected. Check whether we are
* looking for real source or RP */
if (type == PIM_IIF_SOURCE) {
src->upstream = NULL;
return TRUE;
}
/* PIM_IIF_RP */
nbr_addr = src_addr;
} else {
/* TODO: probably need to check the case if the iif is disabled */
/* Use the lastest resource: the kernel unicast routing table */
k_req_incoming(src_addr, &rpfc);
if ((rpfc.iif == NO_VIF) || rpfc.rpfneighbor.s_addr == INADDR_ANY_N) {
/* couldn't find a route */
IF_DEBUG(DEBUG_PIM_MRT | DEBUG_RPF)
logit(LOG_DEBUG, 0, "NO ROUTE found for %s", inet_fmt(src_addr, s1, sizeof(s1)));
return FALSE;
}
src->incoming = rpfc.iif;
nbr_addr = rpfc.rpfneighbor.s_addr;
/* set the preference for sources that aren't directly connected. */
vif = &uvifs[src->incoming];
src->preference = vif->uv_local_pref;
src->metric = vif->uv_local_metric;
}
/* The upstream router must be a (PIM router) neighbor, otherwise we
* are in big trouble ;-) */
vif = &uvifs[src->incoming];
for (nbr = vif->uv_pim_neighbors; nbr; nbr = nbr->next) {
if (ntohl(nbr_addr) < ntohl(nbr->address))
continue;
if (nbr_addr == nbr->address) {
/* The upstream router is found in the list of neighbors.
* We are safe! */
src->upstream = nbr;
IF_DEBUG(DEBUG_RPF)
logit(LOG_DEBUG, 0,
"For src %s, iif is %d, next hop router is %s",
inet_fmt(src_addr, s1, sizeof(s1)), src->incoming,
inet_fmt(nbr_addr, s2, sizeof(s2)));
return TRUE;
}
break;
}
/* TODO: control the number of messages! */
logit(LOG_INFO, 0,
"For src %s, iif is %d, next hop router is %s: NOT A PIM ROUTER",
inet_fmt(src_addr, s1, sizeof(s1)), src->incoming,
inet_fmt(nbr_addr, s2, sizeof(s2)));
src->upstream = NULL;
return FALSE;
}
/*
* TODO: XXX: currently `source` is not used. Will be used with IGMPv3 where
* we have source-specific Join/Prune.
*/
void add_leaf(vifi_t vifi, uint32_t source __attribute__((unused)), uint32_t group)
{
mrtentry_t *mrt;
mrtentry_t *srcs;
vifbitmap_t old_oifs;
vifbitmap_t new_oifs;
vifbitmap_t new_leaves;
/* Don't create routing entries for the LAN scoped addresses */
if (ntohl(group) <= INADDR_MAX_LOCAL_GROUP) { /* group <= 224.0.0.255? */
IF_DEBUG(DEBUG_IGMP) {
logit(LOG_DEBUG, 0, "Not creating routing entry for LAN scoped group %s",
inet_fmt(group, s1, sizeof(s1)));
}
return;
}
/*
* XXX: only if I am a DR, the IGMP Join should result in creating
* a PIM MRT state.
* XXX: Each router must know if it has local members, i.e., whether
* it is a last-hop router as well. This info is needed so it will
* know whether is allowed to initiate a SPT switch by sending
* a PIM (S,G) Join to the high datarate source.
* However, if a non-DR last-hop router has not received
* a PIM Join, it should not create a PIM state, otherwise later
* this state may incorrectly trigger PIM joins.
* There is a design flow in pimd, so without making major changes
* the best we can do is that the non-DR last-hop router will
* record the local members only after it receives PIM Join from the DR
* (i.e. after the second or third IGMP Join by the local member).
* The downside is that a last-hop router may delay the initiation
* of the SPT switch. Sigh...
*/
if (uvifs[vifi].uv_flags & VIFF_DR)
mrt = find_route(INADDR_ANY_N, group, MRTF_WC, CREATE);
else
mrt = find_route(INADDR_ANY_N, group, MRTF_WC, DONT_CREATE);
if (!mrt)
return;
IF_DEBUG(DEBUG_MRT)
logit(LOG_DEBUG, 0, "Adding vif %d for group %s", vifi, inet_fmt(group, s1, sizeof(s1)));
if (VIFM_ISSET(vifi, mrt->leaves))
return; /* Already a leaf */
calc_oifs(mrt, &old_oifs);
VIFM_COPY(mrt->leaves, new_leaves);
VIFM_SET(vifi, new_leaves); /* Add the leaf */
change_interfaces(mrt,
mrt->incoming,
mrt->joined_oifs,
mrt->pruned_oifs,
new_leaves,
mrt->asserted_oifs, 0);
calc_oifs(mrt, &new_oifs);
/* Only if I am the DR for that subnet, eventually initiate a Join */
if (!(uvifs[vifi].uv_flags & VIFF_DR))
return;
if ((mrt->flags & MRTF_NEW) || (VIFM_ISEMPTY(old_oifs) && (!VIFM_ISEMPTY(new_oifs)))) {
/* A new created entry or the oifs have changed
* from NULL to non-NULL. */
mrt->flags &= ~MRTF_NEW;
FIRE_TIMER(mrt->jp_timer); /* Timeout the Join/Prune timer */
/* TODO: explicitly call the function below?
send_pim_join_prune(mrt->upstream->vifi,
mrt->upstream,
PIM_JOIN_PRUNE_HOLDTIME);
*/
}
/* Check all (S,G) entries and set the inherited "leaf" flag.
* TODO: XXX: This won't work for IGMPv3, because there we don't know
* whether the (S,G) leaf oif was inherited from the (*,G) entry or
* was created by source specific IGMP join.
*/
for (srcs = mrt->group->mrtlink; srcs; srcs = srcs->grpnext) {
VIFM_COPY(srcs->leaves, new_leaves);
VIFM_SET(vifi, new_leaves);
change_interfaces(srcs,
srcs->incoming,
srcs->joined_oifs,
srcs->pruned_oifs,
new_leaves,
srcs->asserted_oifs, 0);
}
}
/*
* TODO: XXX: currently `source` is not used. To be used with IGMPv3 where
* we have source-specific joins/prunes.
*/
void delete_leaf(vifi_t vifi, uint32_t source __attribute__((unused)), uint32_t group)
{
mrtentry_t *mrt;
mrtentry_t *srcs;
vifbitmap_t new_oifs;
vifbitmap_t old_oifs;
vifbitmap_t new_leaves;
mrt = find_route(INADDR_ANY_N, group, MRTF_WC, DONT_CREATE);
if (!mrt)
return;
if (!VIFM_ISSET(vifi, mrt->leaves))
return; /* This interface wasn't leaf */
calc_oifs(mrt, &old_oifs);
VIFM_COPY(mrt->leaves, new_leaves);
VIFM_CLR(vifi, new_leaves);
change_interfaces(mrt,
mrt->incoming,
mrt->joined_oifs,
mrt->pruned_oifs,
new_leaves,
mrt->asserted_oifs, 0);
calc_oifs(mrt, &new_oifs);
if ((!VIFM_ISEMPTY(old_oifs)) && VIFM_ISEMPTY(new_oifs)) {
/* The result oifs have changed from non-NULL to NULL */
FIRE_TIMER(mrt->jp_timer); /* Timeout the Join/Prune timer */
/* TODO: explicitly call the function below?
send_pim_join_prune(mrt->upstream->vifi,
mrt->upstream,
PIM_JOIN_PRUNE_HOLDTIME);
*/
}
/* Check all (S,G) entries and clear the inherited "leaf" flag.
* TODO: XXX: This won't work for IGMPv3, because there we don't know
* whether the (S,G) leaf oif was inherited from the (*,G) entry or
* was created by source specific IGMP join.
*/
for (srcs = mrt->group->mrtlink; srcs; srcs = srcs->grpnext) {
VIFM_COPY(srcs->leaves, new_leaves);
VIFM_CLR(vifi, new_leaves);
change_interfaces(srcs,
srcs->incoming,
srcs->joined_oifs,
srcs->pruned_oifs,
new_leaves,
srcs->asserted_oifs, 0);
}
}
void calc_oifs(mrtentry_t *mrt, vifbitmap_t *oifs_ptr)
{
vifbitmap_t oifs;
mrtentry_t *grp;
mrtentry_t *mrp;
/*
* oifs =
* (((copied_outgoing + my_join) - my_prune) + my_leaves)
* - my_asserted_oifs - incoming_interface,
* i.e. `leaves` have higher priority than `prunes`, but lower priority
* than `asserted`. The incoming interface is always deleted from the oifs
*/
if (!mrt) {
VIFM_CLRALL(*oifs_ptr);
return;
}
VIFM_CLRALL(oifs);
if (!(mrt->flags & MRTF_PMBR)) {
/* Either (*,G) or (S,G). Merge with the oifs from the (*,*,RP) */
mrp = mrt->group->active_rp_grp->rp->rpentry->mrtlink;
if (mrp) {
VIFM_MERGE(oifs, mrp->joined_oifs, oifs);
VIFM_CLR_MASK(oifs, mrp->pruned_oifs);
VIFM_MERGE(oifs, mrp->leaves, oifs);
VIFM_CLR_MASK(oifs, mrp->asserted_oifs);
}
}
if (mrt->flags & MRTF_SG) {
/* (S,G) entry. Merge with the oifs from (*,G) */
grp = mrt->group->grp_route;
if (grp) {
VIFM_MERGE(oifs, grp->joined_oifs, oifs);
VIFM_CLR_MASK(oifs, grp->pruned_oifs);
VIFM_MERGE(oifs, grp->leaves, oifs);
VIFM_CLR_MASK(oifs, grp->asserted_oifs);
}
}
/* Calculate my own stuff */
VIFM_MERGE(oifs, mrt->joined_oifs, oifs);
VIFM_CLR_MASK(oifs, mrt->pruned_oifs);
VIFM_MERGE(oifs, mrt->leaves, oifs);
VIFM_CLR_MASK(oifs, mrt->asserted_oifs);
VIFM_COPY(oifs, *oifs_ptr);
}
/*
* Set the iif, join/prune/leaves/asserted interfaces. Calculate and
* set the oifs.
* Return 1 if oifs change from NULL to not-NULL.
* Return -1 if oifs change from non-NULL to NULL
* else return 0
* If the iif change or if the oifs change from NULL to non-NULL
* or vice-versa, then schedule that mrtentry join/prune timer to
* timeout immediately.
*/
int change_interfaces(mrtentry_t *mrt,
vifi_t new_iif,
vifbitmap_t new_joined_oifs_,
vifbitmap_t new_pruned_oifs,
vifbitmap_t new_leaves_,
vifbitmap_t new_asserted_oifs,
uint16_t flags)
{
vifbitmap_t new_joined_oifs; /* The oifs for that particular mrtentry */
vifbitmap_t old_joined_oifs __attribute__ ((unused));
vifbitmap_t old_pruned_oifs __attribute__ ((unused));
vifbitmap_t old_leaves __attribute__ ((unused));
vifbitmap_t new_leaves;
vifbitmap_t old_asserted_oifs __attribute__ ((unused));
vifbitmap_t new_real_oifs; /* The result oifs */
vifbitmap_t old_real_oifs;
vifi_t old_iif;
rpentry_t *rp;
cand_rp_t *cand_rp;
kernel_cache_t *kc;
rp_grp_entry_t *rp_grp;
grpentry_t *grp;
mrtentry_t *srcs;
mrtentry_t *mwc;
mrtentry_t *mrp;
int delete_mrt_flag;
int result;
int fire_timer_flag;
if (!mrt)
return 0;
VIFM_COPY(new_joined_oifs_, new_joined_oifs);
VIFM_COPY(new_leaves_, new_leaves);
old_iif = mrt->incoming;
VIFM_COPY(mrt->joined_oifs, old_joined_oifs);
VIFM_COPY(mrt->leaves, old_leaves);
VIFM_COPY(mrt->pruned_oifs, old_pruned_oifs);
VIFM_COPY(mrt->asserted_oifs, old_asserted_oifs);
VIFM_COPY(mrt->oifs, old_real_oifs);
mrt->incoming = new_iif;
VIFM_COPY(new_joined_oifs, mrt->joined_oifs);
VIFM_COPY(new_pruned_oifs, mrt->pruned_oifs);
VIFM_COPY(new_leaves, mrt->leaves);
VIFM_COPY(new_asserted_oifs, mrt->asserted_oifs);
calc_oifs(mrt, &new_real_oifs);
if (VIFM_ISEMPTY(old_real_oifs)) {
if (VIFM_ISEMPTY(new_real_oifs))
result = 0;
else
result = 1;
} else {
if (VIFM_ISEMPTY(new_real_oifs))
result = -1;
else
result = 0;
}
if ((VIFM_SAME(new_real_oifs, old_real_oifs))
&& (new_iif == old_iif)
&& !(flags & MFC_UPDATE_FORCE))
return 0; /* Nothing to change */
if ((result != 0) || (new_iif != old_iif) || (flags & MFC_UPDATE_FORCE)) {
FIRE_TIMER(mrt->jp_timer);
}
VIFM_COPY(new_real_oifs, mrt->oifs);
if (mrt->flags & MRTF_PMBR) {
/* (*,*,RP) entry */
rp = mrt->source;
if (!rp)
return 0; /* Shouldn't happen */
rp->incoming = new_iif;
cand_rp = rp->cand_rp;
if (VIFM_ISEMPTY(new_real_oifs)) {
delete_mrt_flag = TRUE;
} else {
delete_mrt_flag = FALSE;
#ifdef RSRR
rsrr_cache_send(mrt, RSRR_NOTIFICATION_OK);
#endif /* RSRR */
}
if (mrt->flags & MRTF_KERNEL_CACHE) {
/* Update the kernel MFC entries */
if (delete_mrt_flag == TRUE) {
/* XXX: no need to send RSRR message. Will do it when
* delete the mrtentry.
*/
for (kc = mrt->kernel_cache; kc; kc = kc->next)
delete_mrtentry_all_kernel_cache(mrt);
} else {
/* here mrt->source->address is the RP address */
for (kc = mrt->kernel_cache; kc; kc = kc->next)
k_chg_mfc(igmp_socket, kc->source,
kc->group, new_iif,
new_real_oifs, mrt->source->address);
}
}
/*
* Update all (*,G) entries associated with this RP.
* The particular (*,G) outgoing are not changed, but the change
* in the (*,*,RP) oifs may have affect the real oifs.
*/
fire_timer_flag = FALSE;
for (rp_grp = cand_rp->rp_grp_next; rp_grp; rp_grp = rp_grp->rp_grp_next) {
for (grp = rp_grp->grplink; grp; grp = grp->rpnext) {
if (grp->grp_route) {
if (change_interfaces(grp->grp_route, new_iif,
grp->grp_route->joined_oifs,
grp->grp_route->pruned_oifs,
grp->grp_route->leaves,
grp->grp_route->asserted_oifs,
flags))
fire_timer_flag = TRUE;
} else {
/* Change all (S,G) entries if no (*,G) */
for (srcs = grp->mrtlink; srcs; srcs = srcs->grpnext) {
if (srcs->flags & MRTF_RP) {
if (change_interfaces(srcs, new_iif,
srcs->joined_oifs,
srcs->pruned_oifs,
srcs->leaves,
srcs->asserted_oifs,
flags))
fire_timer_flag = TRUE;
} else {
if (change_interfaces(srcs,
srcs->incoming,
srcs->joined_oifs,
srcs->pruned_oifs,
srcs->leaves,
srcs->asserted_oifs,
flags))
fire_timer_flag = TRUE;
}
}
}
}
}
if (fire_timer_flag == TRUE)
FIRE_TIMER(mrt->jp_timer);
if (delete_mrt_flag == TRUE) {
/* TODO: XXX: trigger a Prune message? Don't delete now, it will
* be automatically timed out. If want to delete now, don't
* reference to it anymore!
delete_mrtentry(mrt);
*/
}
return result; /* (*,*,RP) */
}
if (mrt->flags & MRTF_WC) {
/* (*,G) entry */
if (VIFM_ISEMPTY(new_real_oifs)) {
delete_mrt_flag = TRUE;
} else {
delete_mrt_flag = FALSE;
#ifdef RSRR
rsrr_cache_send(mrt, RSRR_NOTIFICATION_OK);
#endif /* RSRR */
}
if (mrt->flags & MRTF_KERNEL_CACHE) {
if (delete_mrt_flag == TRUE) {
delete_mrtentry_all_kernel_cache(mrt);
} else {
for (kc = mrt->kernel_cache; kc; kc = kc->next)
k_chg_mfc(igmp_socket, kc->source,
kc->group, new_iif,
new_real_oifs, mrt->group->rpaddr);
}
}
/* Update all (S,G) entries for this group.
* For the (S,G)RPbit entries the iif is the iif toward the RP;
* The particular (S,G) oifs are not changed, but the change in the
* (*,G) oifs may affect the real oifs.
*/
fire_timer_flag = FALSE;
for (srcs = mrt->group->mrtlink; srcs; srcs = srcs->grpnext) {
if (srcs->flags & MRTF_RP) {
if (change_interfaces(srcs, new_iif,
srcs->joined_oifs,
srcs->pruned_oifs,
srcs->leaves,
srcs->asserted_oifs, flags))
fire_timer_flag = TRUE;
} else {
if (change_interfaces(srcs, srcs->incoming,
srcs->joined_oifs,
srcs->pruned_oifs,
srcs->leaves,
srcs->asserted_oifs, flags))
fire_timer_flag = TRUE;
}
}
if (fire_timer_flag == TRUE)
FIRE_TIMER(mrt->jp_timer);
if (delete_mrt_flag == TRUE) {
/* TODO: XXX: the oifs are NULL. Send a Prune message? */
}
return result; /* (*,G) */
}
/* (S,G) entry */
if (mrt->flags & MRTF_SG) {
mrp = mrt->group->active_rp_grp->rp->rpentry->mrtlink;
mwc = mrt->group->grp_route;
#ifdef KERNEL_MFC_WC_G
mrtentry_t *tmp;
/* Check whether (*,*,RP) or (*,G) have different (iif,oifs) from
* the (S,G). If "yes", then forbid creating (*,G) MFC. */
for (tmp = mrp; 1; tmp = mwc) {
while (1) {
vifbitmap_t oifs;
if (!tmp)
break;
if (tmp->flags & MRTF_MFC_CLONE_SG)
break;
if (tmp->incoming != mrt->incoming) {
delete_single_kernel_cache_addr(tmp, INADDR_ANY_N, mrt->group->group);
tmp->flags |= MRTF_MFC_CLONE_SG;
break;
}
calc_oifs(tmp, &oifs);
if (!(VIFM_SAME(new_real_oifs, oifs)))
tmp->flags |= MRTF_MFC_CLONE_SG;
break;
}
if (tmp == mwc)
break;
}
#endif /* KERNEL_MFC_WC_G */
if (VIFM_ISEMPTY(new_real_oifs)) {
delete_mrt_flag = TRUE;
} else {
delete_mrt_flag = FALSE;
#ifdef RSRR
rsrr_cache_send(mrt, RSRR_NOTIFICATION_OK);
#endif
}
if (mrt->flags & MRTF_KERNEL_CACHE) {
if (delete_mrt_flag == TRUE)
delete_mrtentry_all_kernel_cache(mrt);
else
k_chg_mfc(igmp_socket, mrt->source->address,
mrt->group->group, new_iif, new_real_oifs,
mrt->group->rpaddr);
}
if (old_iif != new_iif) {
if (new_iif == mrt->source->incoming) {
/* For example, if this was (S,G)RPbit with iif toward the RP,
* and now switch to the Shortest Path.
* The setup of MRTF_SPT flag must be
* done by the external calling function (triggered only
* by receiving of a data from the source.)
*/
mrt->flags &= ~MRTF_RP;
/* TODO: XXX: delete? Check again where will be the best
* place to set it.
mrt->flags |= MRTF_SPT;
*/
}
if ((mwc && mwc->incoming == new_iif) ||
(mrp && mrp->incoming == new_iif)) {
/* If the new iif points toward the RP, reset the SPT flag.
* (PIM-SM-spec-10.ps pp. 11, 2.10, last sentence of first
* paragraph. */
/* TODO: XXX: check again! */
mrt->flags &= ~MRTF_SPT;
mrt->flags |= MRTF_RP;
}
}
/* TODO: XXX: if this is (S,G)RPbit entry and the oifs==(*,G)oifs,
* then delete the (S,G) entry?? The same if we have (*,*,RP) ? */
if (delete_mrt_flag == TRUE) {
/* TODO: XXX: the oifs are NULL. Send a Prune message ? */
}
/* TODO: XXX: have the feeling something is missing.... */
return result; /* (S,G) */
}
return result;
}
/* TODO: implement it. Required to allow changing of the physical interfaces
* configuration without need to restart pimd.
*/
int delete_vif_from_mrt(vifi_t vifi __attribute__((unused)))
{
return TRUE;
}
void process_kernel_call(void)
{
struct igmpmsg *igmpctl = (struct igmpmsg *)igmp_recv_buf;
switch (igmpctl->im_msgtype) {
case IGMPMSG_NOCACHE:
process_cache_miss(igmpctl);
break;
case IGMPMSG_WRONGVIF:
process_wrong_iif(igmpctl);
break;
case IGMPMSG_WHOLEPKT:
process_whole_pkt(igmp_recv_buf);
break;
default:
IF_DEBUG(DEBUG_KERN)
logit(LOG_DEBUG, 0, "Unknown IGMP message type from kernel: %d", igmpctl->im_msgtype);
break;
}
}
/*
* TODO: when cache miss, check the iif, because probably ASSERTS
* shoult take place
*/
static void process_cache_miss(struct igmpmsg *igmpctl)
{
uint32_t source, mfc_source;
uint32_t group;
uint32_t rp_addr;
vifi_t iif;
mrtentry_t *mrt;
mrtentry_t *mrp;
/* When there is a cache miss, we check only the header of the packet
* (and only it should be sent up by the kernel. */
group = igmpctl->im_dst.s_addr;
source = mfc_source = igmpctl->im_src.s_addr;
iif = igmpctl->im_vif;
IF_DEBUG(DEBUG_MFC)
logit(LOG_DEBUG, 0, "Cache miss, src %s, dst %s, iif %d",
inet_fmt(source, s1, sizeof(s1)), inet_fmt(group, s2, sizeof(s2)), iif);
/* TODO: XXX: check whether the kernel generates cache miss for the LAN scoped addresses */
if (ntohl(group) <= INADDR_MAX_LOCAL_GROUP)
return; /* Don't create routing entries for the LAN scoped addresses */
/* TODO: check if correct in case the source is one of my addresses */
/* If I am the DR for this source, create (S,G) and add the register_vif
* to the oifs. */
if ((uvifs[iif].uv_flags & VIFF_DR) && (find_vif_direct_local(source) == iif)) {
mrt = find_route(source, group, MRTF_SG, CREATE);
if (!mrt)
return;
mrt->flags &= ~MRTF_NEW;
/* set reg_vif_num as outgoing interface ONLY if I am not the RP */
if (mrt->group->rpaddr != my_cand_rp_address)
VIFM_SET(reg_vif_num, mrt->joined_oifs);
change_interfaces(mrt,
mrt->incoming,
mrt->joined_oifs,
mrt->pruned_oifs,
mrt->leaves,
mrt->asserted_oifs, 0);
} else {
mrt = find_route(source, group, MRTF_SG | MRTF_WC | MRTF_PMBR, DONT_CREATE);
if (!mrt)
return;
}
/* TODO: if there are too many cache miss for the same (S,G),
* install negative cache entry in the kernel (oif==NULL) to prevent
* too many upcalls. */
if (mrt->incoming == iif) {
if (!VIFM_ISEMPTY(mrt->oifs)) {
if (mrt->flags & MRTF_SG) {
/* TODO: check that the RPbit is not set? */
/* TODO: XXX: TIMER implem. dependency! */
if (mrt->timer < PIM_DATA_TIMEOUT)
SET_TIMER(mrt->timer, PIM_DATA_TIMEOUT);
if (!(mrt->flags & MRTF_SPT)) {
mrp = mrt->group->grp_route;
if (!mrp)
mrp = mrt->group->active_rp_grp->rp->rpentry->mrtlink;
if (mrp) {
/* Check if the (S,G) iif is different from
* the (*,G) or (*,*,RP) iif */
if ((mrt->incoming != mrp->incoming) ||
(mrt->upstream != mrp->upstream)) {
mrt->flags |= MRTF_SPT;
mrt->flags &= ~MRTF_RP;
}
}
}
}
if (mrt->flags & MRTF_PMBR)
rp_addr = mrt->source->address;
else
rp_addr = mrt->group->rpaddr;
mfc_source = source;
#ifdef KERNEL_MFC_WC_G
if (mrt->flags & (MRTF_WC | MRTF_PMBR))
if (!(mrt->flags & MRTF_MFC_CLONE_SG))
mfc_source = INADDR_ANY_N;
#endif /* KERNEL_MFC_WC_G */
add_kernel_cache(mrt, mfc_source, group, MFC_MOVE_FORCE);
#ifdef SCOPED_ACL
APPLY_SCOPE(group, mrt);
#endif
k_chg_mfc(igmp_socket, mfc_source, group, iif, mrt->oifs, rp_addr);
/* No need for RSRR message, because nothing has changed. */
}
return; /* iif match */
}
/* The iif doesn't match */
if (mrt->flags & MRTF_SG) {
/* Arrived on wrong interface */
if (mrt->flags & MRTF_SPT)
return;
mrp = mrt->group->grp_route;
if (!mrp)
mrp = mrt->group->active_rp_grp->rp->rpentry->mrtlink;
if (mrp) {
/* Forward on (*,G) or (*,*,RP) */
if (mrp->incoming == iif) {
#ifdef KERNEL_MFC_WC_G
if (!(mrp->flags & MRTF_MFC_CLONE_SG))
mfc_source = INADDR_ANY_N;
#endif /* KERNEL_MFC_WC_G */
add_kernel_cache(mrp, mfc_source, group, 0);
#ifdef SCOPED_ACL
/* marian: not sure if we reach here with our scoped traffic? */
APPLY_SCOPE(group, mrt);
#endif
k_chg_mfc(igmp_socket, mfc_source, group, iif,
mrp->oifs, mrt->group->rpaddr);
#ifdef RSRR
rsrr_cache_send(mrp, RSRR_NOTIFICATION_OK);
#endif /* RSRR */
}
}
}
}
/*
* A multicast packet has been received on wrong iif by the kernel.
* Check for a matching entry. If there is (S,G) with reset SPTbit and
* the packet was received on the iif toward the source, this completes
* the switch to the shortest path and triggers (S,G) prune toward the RP
* (unless I am the RP).
* Otherwise, if the packet's iif is in the oiflist of the routing entry,
* trigger an Assert.
*/
static void process_wrong_iif(struct igmpmsg *igmpctl)
{
uint32_t source;
uint32_t group;
vifi_t iif;
mrtentry_t *mrt;
group = igmpctl->im_dst.s_addr;
source = igmpctl->im_src.s_addr;
iif = igmpctl->im_vif;
/* Don't create routing entries for the LAN scoped addresses */
if (ntohl(group) <= INADDR_MAX_LOCAL_GROUP)
return;
/* Ignore if it comes on register vif. register vif is neither SPT iif,
* neither is used to send asserts out.
*/
if (uvifs[iif].uv_flags & VIFF_REGISTER)
return;
mrt = find_route(source, group, MRTF_SG | MRTF_WC | MRTF_PMBR, DONT_CREATE);
if (!mrt)
return;
/*
* TODO: check again!
*/
if (mrt->flags & MRTF_SG) {
if (!(mrt->flags & MRTF_SPT)) {
if (mrt->source->incoming == iif) {
/* Switch to the Shortest Path */
mrt->flags |= MRTF_SPT;
mrt->flags &= ~MRTF_RP;
add_kernel_cache(mrt, source, group, MFC_MOVE_FORCE);
k_chg_mfc(igmp_socket, source, group, iif,
mrt->oifs, mrt->group->rpaddr);
FIRE_TIMER(mrt->jp_timer);
#ifdef RSRR
rsrr_cache_send(mrt, RSRR_NOTIFICATION_OK);
#endif /* RSRR */