-
Notifications
You must be signed in to change notification settings - Fork 12
/
Copy pathptm_bfd.c
5064 lines (4255 loc) · 157 KB
/
ptm_bfd.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 2013 Cumulus Networks, LLC. All rights reserved.
* Copyright 2014,2015,2016,2017 Cumulus Networks, Inc. All rights reserved.
*
* This file is licensed to You under the Eclipse Public License (EPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* ptm_bfd.[ch] implements the BFD protocol and interacts with
* other ptm modules
*
* Poll Mode is not supported
*
* Authors
* -------
* Shrijeet Mukherjee [[email protected]]
* Kanna Rajagopal [[email protected]]
* Radhika Mahankali [[email protected]]
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netdb.h>
#include <time.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/filter.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/udp.h>
#include <linux/ip.h>
#include <sys/ioctl.h>
#include "hash/uthash.h"
#include "ptm_event.h"
#include "ptm_timer.h"
#include "ptm_conf.h"
#include "ptm_lib.h"
#include "ptm_bfd.h"
#include "ptm_nbr.h"
#include "ptm_ctl.h"
#include "log.h"
#include "ptm_util.h"
/* iov for BFD control frames */
#define CMSG_HDR_LEN sizeof(struct cmsghdr)
#define CMSG_TTL_LEN (CMSG_HDR_LEN + sizeof(uint32_t))
#define CMSG_IN_PKT_INFO_LEN (CMSG_HDR_LEN + sizeof(struct in_pktinfo) + 4)
#define CMSG_IN6_PKT_INFO_LEN (CMSG_HDR_LEN + sizeof(struct in6_addr) + sizeof(int) + 4)
uint8_t msgbuf[BFD_PKT_LEN];
struct iovec msgiov = {
&(msgbuf[0]),
sizeof(msgbuf)
};
uint8_t cmsgbuf[CMSG_TTL_LEN + CMSG_IN_PKT_INFO_LEN];
struct sockaddr_in msgaddr;
struct msghdr msghdr = {
(void *)&msgaddr,
sizeof(msgaddr),
&msgiov,
1,
(void *)&cmsgbuf,
sizeof(cmsgbuf),
0
};
uint8_t cmsgbuf6[CMSG_TTL_LEN + CMSG_IN6_PKT_INFO_LEN];
struct sockaddr_in6 msgaddr6;
struct msghdr msghdr6 = {
(void *)&msgaddr6,
sizeof(msgaddr6),
&msgiov,
1,
(void *)&cmsgbuf6,
sizeof(cmsgbuf6),
0
};
/* Berkeley Packet filter code to filter out BFD Echo packets.
* tcpdump -dd "(udp dst port 3785)"
*/
static struct sock_filter bfd_echo_filter[] = {
{ 0x28, 0, 0, 0x0000000c },
{ 0x15, 0, 4, 0x000086dd },
{ 0x30, 0, 0, 0x00000014 },
{ 0x15, 0, 11, 0x00000011 },
{ 0x28, 0, 0, 0x00000038 },
{ 0x15, 8, 9, 0x00000ec9 },
{ 0x15, 0, 8, 0x00000800 },
{ 0x30, 0, 0, 0x00000017 },
{ 0x15, 0, 6, 0x00000011 },
{ 0x28, 0, 0, 0x00000014 },
{ 0x45, 4, 0, 0x00001fff },
{ 0xb1, 0, 0, 0x0000000e },
{ 0x48, 0, 0, 0x00000010 },
{ 0x15, 0, 1, 0x00000ec9 },
{ 0x6, 0, 0, 0x0000ffff },
{ 0x6, 0, 0, 0x00000000 },
};
/* Berkeley Packet filter code to filter out BFD vxlan packets.
* tcpdump -dd "(udp dst port 4789)"
*/
static struct sock_filter bfd_vxlan_filter[] = {
{ 0x28, 0, 0, 0x0000000c },
{ 0x15, 0, 4, 0x000086dd },
{ 0x30, 0, 0, 0x00000014 },
{ 0x15, 0, 11, 0x00000011 },
{ 0x28, 0, 0, 0x00000038 },
{ 0x15, 8, 9, 0x000012b5 },
{ 0x15, 0, 8, 0x00000800 },
{ 0x30, 0, 0, 0x00000017 },
{ 0x15, 0, 6, 0x00000011 },
{ 0x28, 0, 0, 0x00000014 },
{ 0x45, 4, 0, 0x00001fff },
{ 0xb1, 0, 0, 0x0000000e },
{ 0x48, 0, 0, 0x00000010 },
{ 0x15, 0, 1, 0x000012b5 },
{ 0x6, 0, 0, 0x0000ffff },
{ 0x6, 0, 0, 0x00000000 },
};
/* sync interval expressed in sec */
#define PTM_BFD_CLIENT_SYNC_INTERVAL 20
/* sess pend interval expressed in sec */
#define PTM_BFD_SESS_PEND_INTERVAL 2
char const *PTM_BFD_SESS_UP_FILE = "bfd-sess-up";
char const *PTM_BFD_SESS_DOWN_FILE = "bfd-sess-down";
bfd_session *session_hash = NULL; /* Find session from discriminator */
bfd_session *peer_hash = NULL; /* Find session from peer address */
bfd_session *local_peer_hash = NULL; /* Find session from peer and local
* address */
bfd_sess_parms *topo_parm_hash = NULL; /* Find topo file based params */
bfd_sess_parms *sess_parm_hash = NULL; /* Find sess params per dst ip */
struct bfd_vrf *vrf_hash = NULL;
struct bfd_iface *iface_hash = NULL;
int ttlval = BFD_TTL_VAL;
int tosval = BFD_TOS_VAL;
int rcvttl = BFD_RCV_TTL_VAL;
int pktinfo = BFD_PKT_INFO_VAL;
int ipv6_pktinfo = BFD_IPV6_PKT_INFO_VAL;
int ipv6_only = BFD_IPV6_ONLY_VAL;
struct timespec bfd_tt_epoch;
uint64_t bfd_epoch_skid = 2000000; /* this is in NS */
void ptm_timer_cb_bfd(cl_timer_t *timer, void *context);
static void ptm_bfd_update_sess_params(bfd_session *);
static int ptm_populate_bfd ();
static int ptm_event_bfd(ptm_event_t *event);
static int ptm_process_bfd(int s, ptm_sockevent_e se, void *udata);
static int ptm_parse_bfd(struct ptm_conf_port *port, char *args);
static int ptm_status_bfd(void *, void *, void *);
static int ptm_peer_event_bfd(ptm_event_t *event);
static int bfd_parse_detect_mult(bfd_parms_list *parms, char *val);
static int bfd_parse_required_min_rx(bfd_parms_list *parms, char *val);
static int bfd_parse_up_min_tx(bfd_parms_list *parms, char *val);
static int bfd_parse_required_min_echo(bfd_parms_list *parms, char *val);
static void ptm_bfd_timer_wheel(void);
static bfd_session *ptm_bfd_sess_find(bfd_pkt_t *cp, char *port_name,
ptm_ipaddr peer, ptm_ipaddr local,
char *vrf_name, bool is_mhop);
static bfd_session *ptm_bfd_sess_new(ptm_event_t *event,
ptm_ipaddr peer,
ptm_ipaddr local,
bool is_mhop,
bfd_sess_parms *sess_parms);
static void ptm_bfd_ses_del(bfd_session *bfd);
static int ptm_bfd_echo_sock_init(void);
static int ptm_bfd_process_echo_pkt(int s, ptm_sockevent_e se, void *udata);
static void ptm_bfd_echo_xmt_TO(bfd_session *bfd);
static void ptm_bfd_send_evt_TO(bfd_session *bfd);
static int ptm_bfd_fetch_ifindex (char *if_name, int sd);
static void _fetch_portname_from_ifindex (int ,int ,char *);
static void ptm_bfd_fetch_local_mac (char *if_name, int sd, uint8_t *local_mac);
static int bfd_parse_slow_min_tx(bfd_parms_list *parms, char *val);
static int bfd_parse_src_ipaddr(bfd_parms_list *parms, char *val);
static int bfd_parse_dst_ipaddr(bfd_parms_list *parms, char *val);
static int bfd_parse_ifname(bfd_parms_list *parms, char *val);
static int bfd_parse_vnid(bfd_parms_list *parms, char *val);
static int bfd_parse_multi_hop(bfd_parms_list *parms, char *val);
static int bfd_parse_local_dst_mac(bfd_parms_list *parms, char *val);
static int bfd_parse_local_dst_ip(bfd_parms_list *parms, char *val);
static int bfd_parse_remote_dst_mac(bfd_parms_list *parms, char *val);
static int bfd_parse_remote_dst_ip(bfd_parms_list *parms, char *val);
static int bfd_parse_decay_min_rx(bfd_parms_list *parms, char *val);
static int bfd_parse_forwarding_if_rx(bfd_parms_list *parms, char *val);
static int bfd_parse_cpath_down(bfd_parms_list *parms, char *val);
static int bfd_parse_check_tnl_key(bfd_parms_list *parms, char *val);
static int bfd_parse_max_hop_cnt(bfd_parms_list *parms, char *val);
static int bfd_parse_afi(bfd_parms_list *parms, char *val);
static int bfd_parse_send_event(bfd_parms_list *parms, char *val);
static int bfd_parse_echo_support(bfd_parms_list *parms, char *val);
static int bfd_parse_vrf_name(bfd_parms_list *parms, char *val);
static void ptm_bfd_echo_detect_TO(bfd_session *bfd);
static void ptm_bfd_echo_start(bfd_session *bfd);
static void ptm_bfd_echo_stop(bfd_session *bfd, int polling);
static int ptm_bfd_vxlan_sock_init(void);
void ptm_bfd_vxlan_pkt_snd(bfd_session *bfd, int f_bit);
static bfd_pkt_t *ptm_bfd_process_vxlan_pkt(int s, ptm_sockevent_e se,
void *udata, int *ifindex,
struct sockaddr_in *sin,
bfd_session_vxlan_info_t *vxlan_info,
uint8_t *rx_pkt,
int *mlen);
bool ptm_bfd_validate_vxlan_pkt(bfd_session *bfd,
bfd_session_vxlan_info_t *vxlan_info);
static bfd_sess_parms *ptm_bfd_alloc_sess_parms(void);
static void ptm_bfd_client_timer(cl_timer_t *timer, void *context);
static void ptm_bfd_start_client_timer(void);
static void ptm_bfd_extend_client_timer(void);
static void ptm_bfd_stop_client_timer(void);
static void ptm_bfd_sess_pend_timer(cl_timer_t *timer, void *context);
static void ptm_bfd_start_sess_pend_timer(void);
static void ptm_bfd_stop_sess_pend_timer(void);
static ptm_bfd_client_t *_get_client_info_by_name(char *name);
static ptm_bfd_client_t *_get_client_info_by_idx(int idx);
static void _decr_client_num_sessions(char *name, bool pend);
static void _incr_client_num_sessions(char *name, bool pend);
static ptm_bfd_client_t *_add_client_info(char *name, int seqid);
static void _del_client_info(char *name);
static void handle_bfd_event(ptm_module_e , bfd_sess_parms *, ptm_event_e);
static int ptm_bfd_get_client_list(ptm_client_t *, void *, char *);
static int ptm_bfd_get_client_sess(ptm_client_t *, void *, char *);
static bfd_sess_parms *ptm_clone_bfd_params(bfd_sess_parms *);
static int ptm_bfd_get_vrf_name(char *port_name, char *vrf_name);
//#define PTM_DEBUG 1
#define MAX_CLIENTS 16
#define CLIENT_NAME_DFLT "ptm"
#define CLIENT_SEQID_DFLT 255
#define CLIENT_NAME "client"
#define CLIENT_SEQ_ID "seqid"
#define MAX_SESS_PEND_PER_LOOP 16
bfd_parms_key bfd_parms_key_tbl[] = {
{ .key = "upMinTx", .key_cb = bfd_parse_up_min_tx },
{ .key = "requiredMinRx", .key_cb = bfd_parse_required_min_rx },
{ .key = "detectMult", .key_cb = bfd_parse_detect_mult },
{ .key = "echoMinRx", .key_cb = bfd_parse_required_min_echo },
{ .key = "slowMinTx", .key_cb = bfd_parse_slow_min_tx },
{ .key = "srcIPaddr", .key_cb = bfd_parse_src_ipaddr },
{ .key = "dstIPaddr", .key_cb = bfd_parse_dst_ipaddr },
{ .key = "ifName", .key_cb = bfd_parse_ifname },
{ .key = "vnid", .key_cb = bfd_parse_vnid },
{ .key = "multiHop", .key_cb = bfd_parse_multi_hop },
{ .key = "local_dst_mac", .key_cb = bfd_parse_local_dst_mac },
{ .key = "local_dst_ip", .key_cb = bfd_parse_local_dst_ip },
{ .key = "remote_dst_mac", .key_cb = bfd_parse_remote_dst_mac },
{ .key = "remote_dst_ip", .key_cb = bfd_parse_remote_dst_ip },
{ .key = "decay_min_rx", .key_cb = bfd_parse_decay_min_rx },
{ .key = "forwarding_if_rx", .key_cb = bfd_parse_forwarding_if_rx },
{ .key = "cpath_down", .key_cb = bfd_parse_cpath_down },
{ .key = "check_tnl_key", .key_cb = bfd_parse_check_tnl_key },
{ .key = "maxHopCnt", .key_cb = bfd_parse_max_hop_cnt },
{ .key = "afi", .key_cb = bfd_parse_afi },
{ .key = "sendEvent", .key_cb = bfd_parse_send_event },
{ .key = "echoSupport", .key_cb = bfd_parse_echo_support },
{ .key = "vrfName", .key_cb = bfd_parse_vrf_name },
{ .key = NULL, .key_cb = NULL},
};
bfd_diag_str_list diag_list[] = {
{ .str = "NeighDown", .type = BFD_DIAGNEIGHDOWN},
{ .str = "DetectTime", .type = BFD_DIAGDETECTTIME},
{ .str = "AdminDown", .type = BFD_DIAGADMINDOWN},
{ .str = NULL },
};
static char *get_diag_str(int diag)
{
for (int i = 0; diag_list[i].str; i++) {
if (diag_list[i].type == diag)
return diag_list[i].str;
}
return "N/A";
}
bfd_state_str_list state_list[] = {
{ .str = "AdminDown", .type = PTM_BFD_ADM_DOWN},
{ .str = "Down", .type = PTM_BFD_DOWN},
{ .str = "Init", .type = PTM_BFD_INIT},
{ .str = "Up", .type = PTM_BFD_UP},
{ .str = NULL },
};
/**
* Global structure (private to this file) for bookkeeping - init params,
* input params, statistics, and such.
*/
typedef struct {
ptm_globals_t *gbl;
cl_timer_t *fetch_timer;
int session_count;
bfd_parms_list parms;
int shop_sock;
int mhop_sock;
int echo_sock;
int vxlan_sock;
int shopv6_sock;
int mhopv6_sock;
ptm_event_t event;
cl_timer_t *client_timer;
cl_timer_t *sess_pend_timer;
ptm_bfd_client_t clients[MAX_CLIENTS];
int num_clients;
} ptm_bfd_globals_t;
ptm_bfd_globals_t ptm_bfd;
typedef struct bfd_raw_echo_pkt_s {
struct iphdr ip;
struct udphdr udp;
bfd_echo_pkt_t data;
} bfd_raw_echo_pkt_t;
typedef struct bfd_raw_ctrl_pkt_s {
struct iphdr ip;
struct udphdr udp;
bfd_pkt_t data;
} bfd_raw_ctrl_pkt_t;
typedef struct vxlan_hdr_s {
uint32_t flags;
uint32_t vnid;
} vxlan_hdr_t;
#define IP_ECHO_PKT_LEN (IP_HDR_LEN + UDP_HDR_LEN + BFD_ECHO_PKT_LEN)
#define UDP_ECHO_PKT_LEN (UDP_HDR_LEN + BFD_ECHO_PKT_LEN)
#define IP_CTRL_PKT_LEN (IP_HDR_LEN + UDP_HDR_LEN + BFD_PKT_LEN)
#define UDP_CTRL_PKT_LEN (UDP_HDR_LEN + BFD_PKT_LEN)
#define PTM_BFD_STRCPY_PARM(_f, field, val) strcpy((_f)->field, (val))
#define PTM_BFD_MEMCPY_PARM(_f, field, val) \
memcpy(&(_f)->field, &(val), sizeof((_f)->field))
#define PTM_BFD_SET_PARM(_f, field, val) (_f)->field = (val)
#define PTM_BFD_GET_PARM(_f, field) (_f)->field
#define PTM_BFD_SET_GLOBAL_PARM(field, val) \
PTM_BFD_SET_PARM(&ptm_bfd.parms, field, (val))
#define PTM_BFD_GET_GLOBAL_PARM(field) \
PTM_BFD_GET_PARM(&ptm_bfd.parms, field)
char *BFD_TEMPLATE_KEY = "bfdtmpl";
uint8_t bfd_def_vxlan_dmac [] = {0x00, 0x23, 0x20, 0x00, 0x00, 0x01};
typedef struct udp_psuedo_header_s {
uint32_t saddr;
uint32_t daddr;
uint8_t reserved;
uint8_t protocol;
uint16_t len;
} udp_psuedo_header_t;
#define UDP_PSUEDO_HDR_LEN sizeof(udp_psuedo_header_t)
uint16_t
checksum (uint16_t *buf, int len)
{
int nbytes = len;
int sum = 0;
uint16_t csum = 0;
int size = sizeof(uint16_t);
while (nbytes > 1) {
sum += *buf++;
nbytes -= size;
}
if (nbytes == 1) {
*(uint8_t *) (&csum) = *(uint8_t *) buf;
sum += csum;
}
sum = (sum >> 16) + (sum & 0xFFFF);
sum += (sum >> 16);
csum = ~sum;
return (csum);
}
uint16_t
udp4_checksum (struct iphdr *iph, uint8_t *buf, int len)
{
char *ptr;
udp_psuedo_header_t pudp_hdr;
uint16_t csum;
pudp_hdr.saddr = iph->saddr;
pudp_hdr.daddr = iph->daddr;
pudp_hdr.reserved = 0;
pudp_hdr.protocol = iph->protocol;
pudp_hdr.len = htons(len);
ptr = malloc (UDP_PSUEDO_HDR_LEN + len);
memcpy(ptr, &pudp_hdr, UDP_PSUEDO_HDR_LEN);
memcpy(ptr + UDP_PSUEDO_HDR_LEN, buf, len);
csum = checksum((uint16_t *)ptr, UDP_PSUEDO_HDR_LEN + len);
free (ptr);
return csum;
}
void ptm_bfd_ses_dump(void)
{
bfd_session *bfd, *tmp;
char peer_addr[64], local_addr[64];
DLOG("Sessions List\n");
HASH_ITER(sh, session_hash, bfd, tmp) {
DLOG("session 0x%x with peer %s\n",
bfd->discrs.my_discr,
ptm_ipaddr_net2str(&bfd->shop.peer, peer_addr));
}
DLOG("Single-hop peers List\n");
HASH_ITER(ph, peer_hash, bfd, tmp) {
DLOG("port/peer %s/%s with session 0x%x\n",
bfd->shop.port_name,
ptm_ipaddr_net2str(&bfd->shop.peer, peer_addr),
bfd->discrs.my_discr);
}
DLOG("multihop peers List\n");
HASH_ITER(mh, local_peer_hash, bfd, tmp) {
DLOG("vrf %s local/peer %s/%s with session 0x%x\n",
(strlen(bfd->mhop.vrf_name)) ? bfd->mhop.vrf_name : "N/A",
ptm_ipaddr_net2str(&bfd->mhop.local, local_addr),
ptm_ipaddr_net2str(&bfd->mhop.peer, peer_addr),
bfd->discrs.my_discr);
}
}
uint32_t ptm_bfd_gen_ID(void)
{
static uint32_t sessionID = 1;
return(sessionID++);
}
int ptm_bfd_start_timer(struct timespec *epoch)
{
struct timespec cts;
int64_t cns, tns, delta;
/*
* we have the lowest's create timer run with interval in usec's
* adjust for rollover ??
*/
cl_cur_time(&cts);
cns = timespec_to_ns(&cts);
tns = timespec_to_ns(epoch);
delta = (tns - cns);
if (delta < (int)bfd_epoch_skid) {
delta = (int)bfd_epoch_skid;
}
#ifdef DEBUG_TIMERWHEEL
DLOG("%" PRId64 "\n", delta);
#endif // DEBUG_TIMERWHEEL
cl_timer_arm(ptm_bfd.fetch_timer, ptm_timer_cb_bfd,
delta, (T_UF_PERSIST_SSHOT | T_UF_NSEC));
return 0;
}
/* should only be used for initialization of the 1st session */
void bfd_init_timer(struct timespec *timer, uint64_t tt_epoch)
{
assert(bfd_tt_epoch.tv_sec == 0);
cl_add_time(timer, tt_epoch);
ptm_bfd_start_timer(timer);
}
/*
* Update one of the session timers, if the time to event is lower
* than current lowest, then we need to re-set the timer to next epoch
*/
void bfd_update_timer(struct timespec *timer, uint64_t tt_epoch)
{
cl_cur_time(timer);
cl_add_time(timer, tt_epoch);
/* Update the bfd_tt_epoch, if the timer needs to be fired before the
* lowest timer */
if (((bfd_tt_epoch.tv_sec == 0) && (bfd_tt_epoch.tv_nsec == 0)) ||
(cl_comp_time(&bfd_tt_epoch, timer)) > 0) {
cl_cp_time(&bfd_tt_epoch, timer);
ptm_bfd_start_timer(timer);
}
}
static void ptm_shutdown_bfd(ptm_globals_t *g)
{
int i;
for (i = 0; i < BFD_MAX_FD; i++) {
ptm_fd_cleanup(PTM_MODULE_FD(g, BFD_MODULE, i));
PTM_MODULE_SET_FD(g, -1, BFD_MODULE, i);
}
ptm_bfd_stop_client_timer();
ptm_bfd_stop_sess_pend_timer();
PTM_MODULE_SET_STATE(g, BFD_MODULE, MOD_STATE_ERROR);
/* request a re-init */
ptm_module_request_reinit();
}
int ptm_init_bfd(ptm_globals_t *g)
{
int s, flags;
int mhs;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
int ret;
ptm_bfd.gbl = g;
ptm_bfd.session_count = 0;
/* init the callbacks */
PTM_MODULE_INITIALIZE(g, BFD_MODULE);
PTM_MODULE_EVENTCB(g, BFD_MODULE) = ptm_event_bfd;
PTM_MODULE_POPULATECB(g, BFD_MODULE) = ptm_populate_bfd;
PTM_MODULE_PROCESSCB(g, BFD_MODULE) = ptm_process_bfd;
PTM_MODULE_PARSECB(g, BFD_MODULE) = ptm_parse_bfd;
PTM_MODULE_STATUSCB(g, BFD_MODULE) = ptm_status_bfd;
/* Initialize BFD global defaults */
PTM_BFD_SET_GLOBAL_PARM(up_min_tx, BFD_DEFDESIREDMINTX);
PTM_BFD_SET_GLOBAL_PARM(timers.required_min_rx, BFD_DEFREQUIREDMINRX);
PTM_BFD_SET_GLOBAL_PARM(timers.required_min_echo, BFD_DEF_REQ_MIN_ECHO);
PTM_BFD_SET_GLOBAL_PARM(detect_mult, BFD_DEFDETECTMULT);
PTM_BFD_SET_GLOBAL_PARM(slow_min_tx, BFD_DEF_SLOWTX);
PTM_BFD_SET_GLOBAL_PARM(mh_ttl, BFD_DEF_MHOP_TTL);
PTM_BFD_SET_GLOBAL_PARM(afi, BFD_DEF_AFI);
PTM_BFD_SET_GLOBAL_PARM(send_event, BFD_DEF_SEND_EVT);
PTM_BFD_SET_GLOBAL_PARM(echo_support, BFD_DEF_ECHO_SUPPORT);
/* Make UDP socket to receive control packets */
flags = SOCK_DGRAM | SOCK_CLOEXEC;
if ((s = socket(PF_INET, flags, IPPROTO_UDP)) < 0) {
CRITLOG("Can't get receive socket (single-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
/* Add socket to select */
PTM_MODULE_SET_FD(g, s, BFD_MODULE, BFD_SHOP_FD);
if (setsockopt(s, SOL_IP, IP_TTL, &ttlval, sizeof(ttlval)) < 0) {
CRITLOG("Can't set TTL for outgoing packets (single-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
if (setsockopt(s, SOL_IP, IP_RECVTTL, &rcvttl, sizeof(rcvttl)) < 0) {
CRITLOG("Can't set receive TTL for incoming packets (single-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
if (setsockopt(s, SOL_IP, IP_PKTINFO, &pktinfo, sizeof(pktinfo)) < 0) {
CRITLOG("Can't set receive TTL for incoming packets (single-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons(BFD_DEFDESTPORT);
if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
CRITLOG("Can't bind socket to default port %d: %m\n",
BFD_DEFDESTPORT);
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
ptm_bfd.shop_sock = s;
/* Make UDP socket to receive multihop control packets */
flags = SOCK_DGRAM | SOCK_CLOEXEC;
if ((mhs = socket(PF_INET, flags, IPPROTO_UDP)) < 0) {
CRITLOG("Can't get receive multi-hop socket: %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
/* Add socket to select */
PTM_MODULE_SET_FD(g, mhs, BFD_MODULE, BFD_MHOP_FD);
if (setsockopt(mhs, SOL_IP, IP_TTL, &ttlval, sizeof(ttlval)) < 0) {
CRITLOG("Can't set TTL for outgoing packets (multi-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
if (setsockopt(mhs, SOL_IP, IP_RECVTTL, &rcvttl,
sizeof(rcvttl)) < 0) {
CRITLOG("Can't set receive TTL for incoming packets (multi-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
if (setsockopt(mhs, SOL_IP, IP_PKTINFO, &pktinfo,
sizeof(pktinfo)) < 0) {
CRITLOG("Can't set receive TTL for incoming packets (multi-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons(BFD_DEF_MHOP_DEST_PORT);
if (bind(mhs, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
CRITLOG("Can't bind socket to default multi-hop port %d: %m\n",
BFD_DEF_MHOP_DEST_PORT);
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
ptm_bfd.mhop_sock = mhs;
/* Make UDP socket to receive IPv6 control packets */
flags = SOCK_DGRAM | SOCK_CLOEXEC;
if ((s = socket(PF_INET6, flags, IPPROTO_UDP)) < 0) {
CRITLOG("Can't get receive socket (single-hop IPv6): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
/* Add socket to select */
PTM_MODULE_SET_FD(g, s, BFD_MODULE, BFD_SHOP6_FD);
if (setsockopt(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
&ttlval, sizeof(ttlval)) < 0) {
CRITLOG("Can't set TTL for outgoing packets (single-hop IPv6): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
if (setsockopt(s, IPPROTO_IPV6, IPV6_2292HOPLIMIT,
&rcvttl, sizeof(rcvttl)) < 0) {
CRITLOG("Can't get receive TTL for incoming packets"
" (single-hop IPv6): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
if (setsockopt(s, IPPROTO_IPV6, IPV6_2292PKTINFO,
&ipv6_pktinfo, sizeof(ipv6_pktinfo)) < 0) {
CRITLOG("Can't set IPv6 receive packet info (single-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
&ipv6_only, sizeof(ipv6_only)) < 0) {
CRITLOG("Can't set IPv6 only option (single-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
memset(&sin6, 0, sizeof(struct sockaddr_in6));
sin6.sin6_family = AF_INET6;
sin6.sin6_addr = in6addr_any;
sin6.sin6_port = htons(BFD_DEFDESTPORT);
if (bind(s, (struct sockaddr *)&sin6, sizeof(sin6)) < 0) {
CRITLOG("Can't bind socket to default port %d: %m\n",
BFD_DEFDESTPORT);
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
ptm_bfd.shopv6_sock = s;
/* Make UDP socket to receive multihop IPv6 control packets */
flags = SOCK_DGRAM | SOCK_CLOEXEC;
if ((mhs = socket(PF_INET6, flags, IPPROTO_UDP)) < 0) {
CRITLOG("Can't create receive socket (multi-hop IPv6): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
/* Add socket to select */
PTM_MODULE_SET_FD(g, mhs, BFD_MODULE, BFD_MHOP6_FD);
if (setsockopt(mhs, IPPROTO_IPV6, IPV6_2292HOPLIMIT,
&rcvttl, sizeof(rcvttl)) < 0) {
CRITLOG("Can't get receive TTL for incoming packets"
" (multi-hop IPv6): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
if (setsockopt(mhs, IPPROTO_IPV6, IPV6_2292PKTINFO,
&ipv6_pktinfo, sizeof(ipv6_pktinfo)) < 0) {
CRITLOG("Can't set IPv6 receive packet info (multi-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
if (setsockopt(mhs, IPPROTO_IPV6, IPV6_V6ONLY,
&ipv6_only, sizeof(ipv6_only)) < 0) {
CRITLOG("Can't set IPv6 only option (multi-hop): %m\n");
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
memset(&sin6, 0, sizeof(struct sockaddr_in6));
sin6.sin6_family = AF_INET6;
sin6.sin6_addr = in6addr_any;
sin6.sin6_port = htons(BFD_DEF_MHOP_DEST_PORT);
if (bind(mhs, (struct sockaddr *)&sin6, sizeof(sin6)) < 0) {
CRITLOG("Can't bind socket to default port %d: %m\n",
BFD_DEFDESTPORT);
ptm_shutdown_bfd(ptm_bfd.gbl);
return(-1);
}
ptm_bfd.mhopv6_sock = mhs;
if ((ret = ptm_bfd_echo_sock_init()) == -1)
return -1;
if ((ret = ptm_bfd_vxlan_sock_init()) == -1)
return -1;
PTM_MODULE_SET_STATE(g, BFD_MODULE, MOD_STATE_INITIALIZED);
return ret;
}
#if defined (PKT_DBG)
static void
ptm_dump_bfd_pkt( bfd_pkt_t *cp)
{
DLOG("myDisc %d, yourDisc %d\n", cp->myDisc, cp->yourDisc);
DLOG("Control Fields %d\n", cp->byteFields);
}
#endif // PKT_DBG
/*
* Give a chance to do any post-init operations.
* registering for nbr events is done here so that other modules
* have done initializing
*/
static int
ptm_populate_bfd ()
{
bfd_session *bfd, *tmp;
bfd_sess_parms *tmp_topo, *topo_cfg, *topo_parms;
int old;
struct ptm_conf_port *port;
INFOLOG("%s: Post Init operations \n", __FUNCTION__);
/* register for peer events */
PTM_MODULE_PEERCB(ptm_bfd.gbl, BFD_MODULE, NBR_MODULE)
= ptm_peer_event_bfd;
PTM_MODULE_PEERCB(ptm_bfd.gbl, BFD_MODULE, QUAGGA_MODULE)
= ptm_peer_event_bfd;
PTM_MODULE_PEERCB(ptm_bfd.gbl, BFD_MODULE, NETLINK_MODULE)
= ptm_peer_event_bfd;
/* Delete all the old topo configs for port that are not in Topo file*/
old = HASH_CNT(ph, topo_parm_hash);
HASH_ITER(ph, topo_parm_hash, topo_cfg, tmp_topo) {
port = ptm_conf_get_port_by_name(topo_cfg->port_name);
if (!port || (port && !ptm_conf_is_mod_enabled(port, BFD_MODULE))) {
/* Delete the Topo cfgs not existing in Topo file */
INFOLOG("%s: Port %s has been deleted or BFD disabled\n",
__FUNCTION__, topo_cfg->port_name);
HASH_DELETE(ph, topo_parm_hash, topo_cfg);
free(topo_cfg);
}
}
if (old - HASH_CNT(ph, topo_parm_hash)) {
INFOLOG("%s: Deleted non-existent ports %d\n", __FUNCTION__,
old - HASH_CNT(ph, topo_parm_hash));
}
old = HASH_CNT(ciph, sess_parm_hash);
/* validate existing topo based sessions */
HASH_ITER(ph, peer_hash, bfd, tmp) {
HASH_FIND(ch, bfd->parm_hash, CLIENT_NAME_DFLT,
strlen(CLIENT_NAME_DFLT), topo_parms);
if (!topo_parms)
continue;
HASH_FIND(ph, topo_parm_hash, topo_parms->port_name,
strlen(topo_parms->port_name), topo_cfg);
if (!topo_cfg ||
(topo_cfg->parms.afi != topo_parms->parms.afi)) {
handle_bfd_event(NBR_MODULE, topo_parms, EVENT_DEL);
/* sess parms are deleted by the event handler */
} else {
/* update parms */
handle_bfd_event(NBR_MODULE, topo_cfg, EVENT_UPD);
}
}
if (old - HASH_CNT(ciph, sess_parm_hash)) {
DLOG("%s: Deleted stale topo sessions %d\n",
__FUNCTION__, old - HASH_CNT(ph, peer_hash));
}
PTM_MODULE_SET_STATE(ptm_bfd.gbl, BFD_MODULE, MOD_STATE_POPULATE);
return 0;
}
static int
ptm_process_bfd_pkt(int s, ptm_sockevent_e se, void *udata)
{
int mlen;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
bfd_pkt_t *cp;
struct cmsghdr *cm;
bfd_session *bfd;
uint32_t oldXmtTime;
uint32_t oldEchoXmt_TO;
uint32_t ttlval = BFD_TTL_VAL;
uint8_t old_state;
struct in_pktinfo *pi = NULL;
struct in6_pktinfo *pi6 = NULL;
bool is_mhop = false;
bool is_vxlan = false;
ptm_ipaddr peer, local;
char peer_addr[64];
int local_ifindex = 0;
bool echo_support = FALSE;
char local_portname[MAXNAMELEN+1] = {0};
bfd_session_vxlan_info_t vxlan_info;
uint8_t rx_pkt[BFD_RX_BUF_LEN];
bfd_sess_parms *topo_parms;
char vrf_name[MAXNAMELEN+1] = {0};
if (PTM_GET_STATE(ptm_bfd.gbl) != PTM_RUNNING) {
return (-1);
}
if ((s == ptm_bfd.mhop_sock) || (s == ptm_bfd.mhopv6_sock )) {
is_mhop = true;
} else if (s == ptm_bfd.echo_sock) {
return (ptm_bfd_process_echo_pkt(s, se, udata));
}
memset(&sin, 0, sizeof(sin));
memset(&local, 0, sizeof(ptm_ipaddr));
memset(&peer, 0, sizeof(ptm_ipaddr));
if ((s == ptm_bfd.mhop_sock) || (s == ptm_bfd.shop_sock)) {
if ((mlen = recvmsg(s, &msghdr, MSG_DONTWAIT)) < 0) {
if (errno != EAGAIN) {
ERRLOG("Error receiving from BFD socket: %m\n");
}
return -1;
}
/* Get source address */
sin = *((struct sockaddr_in *)(msghdr.msg_name));
/* keep in network-byte order */
peer.ip4_addr.s_addr = sin.sin_addr.s_addr;
peer.family = AF_INET;
strcpy(peer_addr, inet_ntoa(sin.sin_addr));
/* Get and check TTL */
for (cm = CMSG_FIRSTHDR(&msghdr); cm != NULL;
cm = CMSG_NXTHDR(&msghdr, cm)) {
if (cm->cmsg_level == SOL_IP && cm->cmsg_type == IP_TTL) {
//ttlval = *(uint32_t *)CMSG_DATA(cm);
memcpy(&ttlval, CMSG_DATA(cm), 4);
if ((is_mhop == false) && (ttlval != BFD_TTL_VAL)) {
INFOLOG("Received pkt with invalid TTL %u from %s flags: %d\n",
ttlval, peer_addr, msghdr.msg_flags);
return -1;
}
} else if (cm->cmsg_level == SOL_IP &&
cm->cmsg_type == IP_PKTINFO) {
pi = (struct in_pktinfo *)CMSG_DATA(cm);
if (pi) {
/* keep in network-byte order */
local.family = AF_INET;
local.ip4_addr.s_addr = pi->ipi_addr.s_addr;
local_ifindex = pi->ipi_ifindex;
_fetch_portname_from_ifindex(local_ifindex, s,
local_portname);
}
}
}
/* Implement RFC 5880 6.8.6 */
if (mlen < BFD_PKT_LEN) {
INFOLOG("Received short packet from %s\n", peer_addr);
return -1;
}
cp = (bfd_pkt_t *)(msghdr.msg_iov->iov_base);
} else if ((s == ptm_bfd.mhopv6_sock) || (s == ptm_bfd.shopv6_sock)) {
if ((mlen = recvmsg(s, &msghdr6, MSG_DONTWAIT)) < 0) {
if (errno != EAGAIN) {
ERRLOG("Error receiving from BFD socket: %m\n");
}
return -1;
}
/* Get source address */
sin6 = *((struct sockaddr_in6 *)(msghdr6.msg_name));
/* keep in network-byte order */
peer.ip6_addr = sin6.sin6_addr;
peer.family = AF_INET6;
inet_ntop (AF_INET6, &sin6.sin6_addr, peer_addr, INET6_ADDRSTRLEN);
/* Get and check TTL */
for (cm = CMSG_FIRSTHDR(&msghdr6); cm != NULL;
cm = CMSG_NXTHDR(&msghdr6, cm)) {
if (cm->cmsg_level == IPPROTO_IPV6 && cm->cmsg_type == IPV6_2292HOPLIMIT) {
//ttlval = *(uint32_t *)CMSG_DATA(cm);
memcpy(&ttlval, CMSG_DATA(cm), 4);
if ((is_mhop == false) && (ttlval != BFD_TTL_VAL)) {
INFOLOG("Received pkt with invalid TTL %u from %s flags: %d\n",
ttlval, peer_addr, msghdr6.msg_flags);
return -1;
}
} else if (cm->cmsg_level == IPPROTO_IPV6 &&
cm->cmsg_type == IPV6_2292PKTINFO) {
pi6 = (struct in6_pktinfo *)CMSG_DATA(cm);
if (pi6) {
/* keep in network-byte order */
local.family = AF_INET6;
ptm_util_extract_ipv6_pkt_info(pi6, &local_ifindex,
&local.ip6_addr);
_fetch_portname_from_ifindex(local_ifindex, s,
local_portname);
}
}
}
/* Implement RFC 5880 6.8.6 */
if (mlen < BFD_PKT_LEN) {
INFOLOG("Received short packet from %s\n", peer_addr);
return -1;
}
cp = (bfd_pkt_t *)(msghdr6.msg_iov->iov_base);
} else {
cp = ptm_bfd_process_vxlan_pkt(s, se, udata, &local_ifindex,
&sin, &vxlan_info, rx_pkt, &mlen);
if (!cp) {
return -1;
}
is_vxlan = true;
/* keep in network-byte order */
peer.ip4_addr.s_addr = sin.sin_addr.s_addr;
peer.family = AF_INET;
strcpy(peer_addr, inet_ntoa(sin.sin_addr));
}
if (BFD_GETVER(cp->diag) != BFD_VERSION) {
INFOLOG("Received bad version %d from %s\n",
BFD_GETVER(cp->diag), peer_addr);
return -1;
}
if (cp->detect_mult == 0) {
INFOLOG("Detect Mult is zero in pkt from %s\n", peer_addr);
return -1;
}
if ((cp->len < BFD_PKT_LEN) || (cp->len > mlen)) {
INFOLOG("Invalid length %d in control pkt from %s\n",
cp->len, peer_addr);
return -1;
}
if (cp->discrs.my_discr == 0) {
INFOLOG("My discriminator is zero in pkt from %s\n", peer_addr);
return -1;
}
if ((bfd = ptm_bfd_sess_find(cp, local_portname,
peer, local, vrf_name, is_mhop)) == NULL) {
DLOG("Failed to generate session from remote packet\n");