/
udp_usrreq.c
1465 lines (1348 loc) · 36.2 KB
/
udp_usrreq.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
/* $OpenBSD: udp_usrreq.c,v 1.76 2002/03/15 18:19:53 millert Exp $ */
/* $NetBSD: udp_usrreq.c,v 1.28 1996/03/16 23:54:03 christos Exp $ */
/*
* Copyright (c) 2002 INRIA. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by INRIA and its
* contributors.
* 4. Neither the name of INRIA 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 INSTITUTE 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 INSTITUTE 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.
*/
/*
* Implementation of Internet Group Management Protocol, Version 3.
*
* Developed by Hitoshi Asaeda, INRIA, February 2002.
*/
/*
* Copyright (c) 1982, 1986, 1988, 1990, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)COPYRIGHT 1.1 (NRL) 17 January 1995
*
* NRL grants permission for redistribution and use in source and binary
* forms, with or without modification, of the software and documentation
* created at NRL 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgements:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* This product includes software developed at the Information
* Technology Division, US Naval Research Laboratory.
* 4. Neither the name of the NRL nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL 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 NRL 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.
*
* The views and conclusions contained in the software and documentation
* are those of the authors and should not be interpreted as representing
* official policies, either expressed or implied, of the US Naval
* Research Laboratory (NRL).
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#ifdef IGMPV3
#include <netinet/in_msf.h>
#endif
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include "faith.h"
#if defined(NFAITH) && 0 < NFAITH
#include <net/if_faith.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/ip6protosw.h>
extern int ip6_defhlim;
#endif /* INET6 */
/*
* UDP protocol implementation.
* Per RFC 768, August, 1980.
*/
int udpcksum = 1;
static void udp_detach(struct inpcb *);
static void udp_notify(struct inpcb *, int);
static struct mbuf *udp_saveopt(caddr_t, int, int);
#ifndef UDBHASHSIZE
#define UDBHASHSIZE 128
#endif
int udbhashsize = UDBHASHSIZE;
/* from in_pcb.c */
extern struct baddynamicports baddynamicports;
void
udp_init()
{
in_pcbinit(&udbtable, udbhashsize);
}
#ifdef INET6
int
udp6_input(mp, offp, proto)
struct mbuf **mp;
int *offp, proto;
{
struct mbuf *m = *mp;
#if defined(NFAITH) && 0 < NFAITH
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
#endif
#if defined(NFAITH) && 0 < NFAITH
if (faithprefix(&ip6->ip6_dst)) {
/* XXX send icmp6 host/port unreach? */
m_freem(m);
return IPPROTO_DONE;
}
#endif
udp_input(m, *offp, proto);
return IPPROTO_DONE;
}
#endif
void
udp_input(struct mbuf *m, ...)
{
register struct ip *ip;
register struct udphdr *uh;
register struct inpcb *inp;
struct mbuf *opts = 0;
int len;
struct ip save_ip;
int iphlen;
va_list ap;
u_int16_t savesum;
union {
struct sockaddr sa;
struct sockaddr_in sin;
#ifdef INET6
struct sockaddr_in6 sin6;
#endif /* INET6 */
} srcsa, dstsa;
#ifdef INET6
struct ip6_hdr *ip6;
struct sockaddr_in6 *src_sa6, src_sa6_storage,
*dst_sa6, dst_sa6_storage;
struct ip6_recvpktopts opts6;
#endif /* INET6 */
#ifdef IPSEC
struct m_tag *mtag;
struct tdb_ident *tdbi;
struct tdb *tdb;
int error, s;
#endif /* IPSEC */
#ifdef IGMPV3
u_int32_t src_h;
struct ip_moptions *imo;
struct sockaddr_in *sin;
struct sock_msf_source *msfsrc;
int i;
#endif
va_start(ap, m);
iphlen = va_arg(ap, int);
va_end(ap);
udpstat.udps_ipackets++;
#ifdef INET6
bzero(&opts6, sizeof(opts6));
#endif
switch (mtod(m, struct ip *)->ip_v) {
case 4:
ip = mtod(m, struct ip *);
#ifdef INET6
ip6 = NULL;
#endif /* INET6 */
srcsa.sa.sa_family = AF_INET;
break;
#ifdef INET6
case 6:
ip = NULL;
ip6 = mtod(m, struct ip6_hdr *);
srcsa.sa.sa_family = AF_INET6;
break;
#endif /* INET6 */
default:
goto bad;
}
/*
* Strip IP options, if any; should skip this,
* make available to user, and use on returned packets,
* but we don't yet have a way to check the checksum
* with options still present.
*/
/*
* (contd. from above...) Furthermore, we may want to strip options
* for such things as ICMP errors, where options just get in the way.
*/
if (ip && iphlen > sizeof (struct ip)) {
ip_stripoptions(m, (struct mbuf *)0);
iphlen = sizeof(struct ip);
}
/*
* Get IP and UDP header together in first mbuf.
*/
if (m->m_len < iphlen + sizeof(struct udphdr)) {
if ((m = m_pullup2(m, iphlen + sizeof(struct udphdr))) ==
NULL) {
udpstat.udps_hdrops++;
return;
}
#ifdef INET6
if (ip6) {
ip6 = mtod(m, struct ip6_hdr *);
/*
* extract full sockaddr structures for the src/dst
* addresses, and make local copies of them.
* The copies are necessary because the memory that
* stores src and dst may be freed during the process
* below.
*/
if (ip6_getpktaddrs(m, &src_sa6, &dst_sa6)) {
m_freem(m);
return;
}
src_sa6_storage = *src_sa6;
dst_sa6_storage = *dst_sa6;
src_sa6 = &src_sa6_storage;
dst_sa6 = &dst_sa6_storage;
} else
#endif /* INET6 */
ip = mtod(m, struct ip *);
}
uh = (struct udphdr *)(mtod(m, caddr_t) + iphlen);
/* Check for illegal destination port 0 */
if (uh->uh_dport == 0) {
udpstat.udps_noport++;
goto bad;
}
/*
* Make mbuf data length reflect UDP length.
* If not enough data to reflect UDP length, drop.
*/
len = ntohs((u_int16_t)uh->uh_ulen);
if (m->m_pkthdr.len - iphlen != len) {
if (len > (m->m_pkthdr.len - iphlen) ||
len < sizeof(struct udphdr)) {
udpstat.udps_badlen++;
goto bad;
}
m_adj(m, len - (m->m_pkthdr.len - iphlen));
}
/*
* Save a copy of the IP header in case we want restore it
* for sending an ICMP error message in response.
*/
if (ip)
save_ip = *ip;
/*
* Checksum extended UDP header and data.
* from W.R.Stevens: check incoming udp cksums even if
* udpcksum is not set.
*/
savesum = uh->uh_sum;
#ifdef INET6
if (ip6) {
/* Be proactive about malicious use of IPv4 mapped address */
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
/* XXX stat */
goto bad;
}
/*
* In IPv6, the UDP checksum is ALWAYS used.
*/
if ((uh->uh_sum = in6_cksum(m, IPPROTO_UDP, iphlen, len))) {
udpstat.udps_badsum++;
goto bad;
}
} else
#endif /* INET6 */
if (uh->uh_sum) {
if ((m->m_pkthdr.csum & M_UDP_CSUM_IN_OK) == 0) {
if (m->m_pkthdr.csum & M_UDP_CSUM_IN_BAD) {
udpstat.udps_badsum++;
udpstat.udps_inhwcsum++;
m_freem(m);
return;
}
bzero(((struct ipovly *)ip)->ih_x1,
sizeof ((struct ipovly *)ip)->ih_x1);
((struct ipovly *)ip)->ih_len = uh->uh_ulen;
if ((uh->uh_sum = in_cksum(m, len +
sizeof (struct ip))) != 0) {
udpstat.udps_badsum++;
m_freem(m);
return;
}
} else {
m->m_pkthdr.csum &= ~M_UDP_CSUM_IN_OK;
udpstat.udps_inhwcsum++;
}
} else
udpstat.udps_nosum++;
switch (srcsa.sa.sa_family) {
case AF_INET:
bzero(&srcsa, sizeof(struct sockaddr_in));
srcsa.sin.sin_len = sizeof(struct sockaddr_in);
srcsa.sin.sin_family = AF_INET;
srcsa.sin.sin_port = uh->uh_sport;
srcsa.sin.sin_addr = ip->ip_src;
bzero(&dstsa, sizeof(struct sockaddr_in));
dstsa.sin.sin_len = sizeof(struct sockaddr_in);
dstsa.sin.sin_family = AF_INET;
dstsa.sin.sin_port = uh->uh_dport;
dstsa.sin.sin_addr = ip->ip_dst;
break;
#ifdef INET6
case AF_INET6:
bzero(&srcsa, sizeof(struct sockaddr_in6));
srcsa.sin6.sin6_len = sizeof(struct sockaddr_in6);
srcsa.sin6.sin6_family = AF_INET6;
srcsa.sin6.sin6_port = uh->uh_sport;
#if 0 /*XXX inbound flowinfo */
srcsa.sin6.sin6_flowinfo = htonl(0x0fffffff) & ip6->ip6_flow;
#endif
sa6_copy_addr(src_sa6, &srcsa.sin6);
/*
* XXX: the address may have embedded scope zone ID, which
* should be hidden from applications.
*/
#ifndef SCOPEDROUTING
in6_clearscope(&srcsa.sin6.sin6_addr);
#endif
bzero(&dstsa, sizeof(struct sockaddr_in6));
dstsa.sin6.sin6_len = sizeof(struct sockaddr_in6);
dstsa.sin6.sin6_family = AF_INET6;
dstsa.sin6.sin6_port = uh->uh_dport;
sa6_copy_addr(dst_sa6, &dstsa.sin6);
break;
#endif /* INET6 */
}
#ifdef INET6
if ((ip6 && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) ||
(ip && IN_MULTICAST(ip->ip_dst.s_addr)) ||
(ip && in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)))
#else /* INET6 */
if (IN_MULTICAST(ip->ip_dst.s_addr) ||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))
#endif /* INET6 */
{
struct socket *last;
/*
* Deliver a multicast or broadcast datagram to *all* sockets
* for which the local and remote addresses and ports match
* those of the incoming datagram. This allows more than
* one process to receive multi/broadcasts on the same port.
* (This really ought to be done for unicast datagrams as
* well, but that would cause problems with existing
* applications that open both address-specific sockets and
* a wildcard socket listening to the same port -- they would
* end up receiving duplicates of every unicast datagram.
* Those applications open the multiple sockets to overcome an
* inadequacy of the UDP socket interface, but for backwards
* compatibility we avoid the problem here rather than
* fixing the interface. Maybe 4.5BSD will remedy this?)
*/
iphlen += sizeof(struct udphdr);
/*
* Locate pcb(s) for datagram.
* (Algorithm copied from raw_intr().)
*/
last = NULL;
for (inp = udbtable.inpt_queue.cqh_first;
inp != (struct inpcb *)&udbtable.inpt_queue;
inp = inp->inp_queue.cqe_next) {
#ifdef INET6
/* don't accept it if AF does not match */
if (ip6 && !(inp->inp_flags & INP_IPV6))
continue;
if (!ip6 && (inp->inp_flags & INP_IPV6))
continue;
#endif
if (inp->inp_lport != uh->uh_dport)
continue;
#ifdef INET6
if (ip6) {
if (!SA6_IS_ADDR_UNSPECIFIED(&inp->in6p_lsa))
if (!SA6_ARE_ADDR_EQUAL(&inp->in6p_lsa,
dst_sa6))
continue;
} else
#endif /* INET6 */
if (inp->inp_laddr.s_addr != INADDR_ANY) {
if (inp->inp_laddr.s_addr !=
ip->ip_dst.s_addr)
continue;
}
#ifdef INET6
if (ip6) {
if (!SA6_IS_ADDR_UNSPECIFIED(&inp->in6p_fsa))
if (!SA6_ARE_ADDR_EQUAL(&inp->in6p_fsa,
src_sa6) ||
inp->inp_fport != uh->uh_sport)
continue;
} else
#endif /* INET6 */
if (inp->inp_faddr.s_addr != INADDR_ANY) {
if (inp->inp_faddr.s_addr !=
ip->ip_src.s_addr ||
inp->inp_fport != uh->uh_sport)
continue;
}
#ifdef IGMPV3
#ifdef INET6
#define PASS_TO_PCB() \
do { \
struct mbuf *n; \
if (last != NULL) { \
if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { \
opts = NULL; \
if (ipv6 && (inp->inp_flags & IN6P_CONTROLOPTS)) { \
ip6_savecontrol(inp, ipv6, \
n, &opts6); \
opts = opts6.head; \
} \
m_adj(n, iphlen); \
if (sbappendaddr(&last->so_rcv, \
&srcsa.sa, n, opts) == 0) { \
m_freem(n); \
if (opts) \
m_freem(opts); \
udpstat.udps_fullsock++; \
} else \
sorwakeup(last); \
opts = NULL; \
bzero(&opts6, sizeof(opts6)); \
} \
if (!ip6_setpktaddrs(m, src_sa6, dst_sa6)) \
goto bad; /* XXX */ \
} \
last = inp->inp_socket; \
if ((last->so_options & (SO_REUSEPORT|SO_REUSEADDR)) == 0) \
goto finish_inp_scan; \
} while (0)
#else /* !INET6 */
#define PASS_TO_PCB() \
do { \
struct mbuf *n; \
if (last != NULL) { \
if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { \
opts = NULL; \
m_adj(n, iphlen); \
if (sbappendaddr(&last->so_rcv, \
&srcsa.sa, n, opts) == 0) { \
m_freem(n); \
if (opts) \
m_freem(opts); \
udpstat.udps_fullsock++; \
} else \
sorwakeup(last); \
opts = NULL; \
}
if (!ip6_setpktaddrs(m, src_sa6, dst_sa6)) \
goto bad; /* XXX */ \
} \
last = inp->inp_socket; \
if ((last->so_options & (SO_REUSEPORT|SO_REUSEADDR)) == 0) \
goto finish_inp_scan; \
} while (0)
#endif
/*
* Receive multicast data which fits MSF condition.
*/
#ifdef INET6
if (ip && !IN_MULTICAST(ip->ip_dst.s_addr))
#else
if (!IN_MULTICAST(ip->ip_dst.s_addr))
#endif
{
PASS_TO_PCB();
continue;
}
imo = inp->inp_moptions;
src_h = ntohl(ip->ip_src.s_addr);
for (i = 0; i < imo->imo_num_memberships; i++) {
if (imo->imo_membership[i]->inm_addr.s_addr
!= ip->ip_dst.s_addr)
continue;
/* receive data from any source */
if (imo->imo_msf[i]->msf_grpjoin != 0) {
PASS_TO_PCB();
break;
}
goto search_allow_list;
search_allow_list:
if (imo->imo_msf[i]->msf_numsrc == 0)
goto search_block_list;
LIST_FOREACH(msfsrc,
imo->imo_msf[i]->msf_head,
list) {
sin = (struct sockaddr_in *)&msfsrc->src;
if (sin->sin_addr.s_addr < src_h)
continue;
if (sin->sin_addr.s_addr > src_h) {
/* terminate search, as there
* will be no match */
break;
}
PASS_TO_PCB();
break;
}
search_block_list:
if (imo->imo_msf[i]->msf_blknumsrc == 0)
goto end_of_search;
LIST_FOREACH(msfsrc,
imo->imo_msf[i]->msf_blkhead,
list) {
sin = (struct sockaddr_in *)&msfsrc->src;
if (sin->sin_addr.s_addr < src_h)
continue;
if (sin->sin_addr.s_addr == src_h) {
/* blocks since the src matched
* with block list */
break;
}
/* terminate search, as there will be
* no match */
msfsrc = NULL;
break;
}
/* blocks since the source matched with block
* list */
if (msfsrc == NULL) {
PASS_TO_PCB();
}
end_of_search:
goto next_inp;
}
if (i == imo->imo_num_memberships)
continue;
#undef PASS_TO_PCB
#else /* !IGMPV3 */
if (last != NULL) {
struct mbuf *n;
if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
opts = NULL;
#ifdef INET6
if (ip6 && (inp->inp_flags & IN6P_CONTROLOPTS)) {
ip6_savecontrol(inp, ip6,
n, &opts6);
opts = opts6.head;
}
#endif /* INET6 */
m_adj(n, iphlen);
if (sbappendaddr(&last->so_rcv,
&srcsa.sa, n, opts) == 0) {
m_freem(n);
if (opts)
m_freem(opts);
udpstat.udps_fullsock++;
} else
sorwakeup(last);
opts = NULL;
#ifdef INET6 /* XXX */
bzero(&opts6, sizeof(opts6));
#endif
}
/*
* XXX: m_copy above removes m_aux that
* contains the packet addresses, while we
* still need them for IPsec.
*/
if (!ip6_setpktaddrs(m, src_sa6, dst_sa6))
goto bad; /* XXX */
}
#endif /* IGMPV3 */
last = inp->inp_socket;
/*
* Don't look for additional matches if this one does
* not have either the SO_REUSEPORT or SO_REUSEADDR
* socket options set. This heuristic avoids searching
* through all pcbs in the common case of a non-shared
* port. It * assumes that an application will never
* clear these options after setting them.
*/
if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0)
break;
#ifdef IGMPV3
next_inp:;
#endif
}
#ifdef IGMPV3
finish_inp_scan:
#endif
if (last == NULL) {
/*
* No matching pcb found; discard datagram.
* (No need to send an ICMP Port Unreachable
* for a broadcast or multicast datgram.)
*/
udpstat.udps_noportbcast++;
goto bad;
}
opts = NULL;
#ifdef INET6
if (ip6 && (inp->inp_flags & IN6P_CONTROLOPTS)) {
ip6_savecontrol(inp, ip6, m, &opts6);
opts = opts6.head;
}
#endif /* INET6 */
m_adj(m, iphlen);
if (sbappendaddr(&last->so_rcv,
&srcsa.sa, m, opts) == 0) {
udpstat.udps_fullsock++;
goto bad;
}
sorwakeup(last);
return;
}
/*
* Locate pcb for datagram.
*/
#ifdef INET6
if (ip6)
inp = in6_pcbhashlookup(&udbtable, src_sa6, uh->uh_sport,
dst_sa6, uh->uh_dport);
else
#endif /* INET6 */
inp = in_pcbhashlookup(&udbtable, ip->ip_src, uh->uh_sport,
ip->ip_dst, uh->uh_dport);
if (inp == 0) {
++udpstat.udps_pcbhashmiss;
#ifdef INET6
if (ip6) {
inp = in_pcblookup(&udbtable,
src_sa6, uh->uh_sport, dst_sa6,
uh->uh_dport, INPLOOKUP_WILDCARD | INPLOOKUP_IPV6);
} else
#endif /* INET6 */
inp = in_pcblookup(&udbtable, &ip->ip_src, uh->uh_sport,
&ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
if (inp == 0) {
udpstat.udps_noport++;
if (m->m_flags & (M_BCAST | M_MCAST)) {
udpstat.udps_noportbcast++;
goto bad;
}
#ifdef INET6
if (ip6) {
icmp6_error(m, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_NOPORT,0);
} else
#endif /* INET6 */
{
*ip = save_ip;
uh->uh_sum = savesum;
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT,
0, 0);
}
return;
}
}
#ifdef IPSEC
mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
s = splnet();
if (mtag != NULL) {
tdbi = (struct tdb_ident *)(mtag + 1);
tdb = gettdb(tdbi->spi, &tdbi->dst, tdbi->proto);
} else
tdb = NULL;
ipsp_spd_lookup(m, srcsa.sa.sa_family, iphlen, &error,
IPSP_DIRECTION_IN, tdb, inp);
/* Latch SA only if the socket is connected */
if (inp->inp_tdb_in != tdb &&
(inp->inp_socket->so_state & SS_ISCONNECTED)) {
if (tdb) {
tdb_add_inp(tdb, inp, 1);
if (inp->inp_ipsec_remoteid == NULL &&
tdb->tdb_srcid != NULL) {
inp->inp_ipsec_remoteid = tdb->tdb_srcid;
tdb->tdb_srcid->ref_count++;
}
if (inp->inp_ipsec_remotecred == NULL &&
tdb->tdb_remote_cred != NULL) {
inp->inp_ipsec_remotecred =
tdb->tdb_remote_cred;
tdb->tdb_remote_cred->ref_count++;
}
if (inp->inp_ipsec_remoteauth == NULL &&
tdb->tdb_remote_auth != NULL) {
inp->inp_ipsec_remoteauth =
tdb->tdb_remote_auth;
tdb->tdb_remote_auth->ref_count++;
}
} else { /* Just reset */
TAILQ_REMOVE(&inp->inp_tdb_in->tdb_inp_in, inp,
inp_tdb_in_next);
inp->inp_tdb_in = NULL;
}
}
splx(s);
/* Error or otherwise drop-packet indication. */
if (error)
goto bad;
#endif /*IPSEC */
opts = NULL;
#ifdef INET6
if (ip6 && (inp->inp_flags & IN6P_CONTROLOPTS)) {
ip6_savecontrol(inp, ip6, m, &opts6);
opts = opts6.head;
}
#endif /* INET6 */
if (ip && (inp->inp_flags & INP_CONTROLOPTS)) {
struct mbuf **mp = &opts;
if (inp->inp_flags & INP_RECVDSTADDR) {
*mp = udp_saveopt((caddr_t) &ip->ip_dst,
sizeof(struct in_addr), IP_RECVDSTADDR);
if (*mp)
mp = &(*mp)->m_next;
}
#ifdef notyet
/* options were tossed above */
if (inp->inp_flags & INP_RECVOPTS) {
*mp = udp_saveopt((caddr_t) opts_deleted_above,
sizeof(struct in_addr), IP_RECVOPTS);
if (*mp)
mp = &(*mp)->m_next;
}
/* ip_srcroute doesn't do what we want here, need to fix */
if (inp->inp_flags & INP_RECVRETOPTS) {
*mp = udp_saveopt((caddr_t) ip_srcroute(),
sizeof(struct in_addr), IP_RECVRETOPTS);
if (*mp)
mp = &(*mp)->m_next;
}
#endif
}
iphlen += sizeof(struct udphdr);
m_adj(m, iphlen);
if (sbappendaddr(&inp->inp_socket->so_rcv,
&srcsa.sa, m, opts) == 0) {
udpstat.udps_fullsock++;
goto bad;
}
sorwakeup(inp->inp_socket);
return;
bad:
m_freem(m);
if (opts)
m_freem(opts);
}
/*
* Create a "control" mbuf containing the specified data
* with the specified type for presentation with a datagram.
*/
struct mbuf *
udp_saveopt(p, size, type)
caddr_t p;
register int size;
int type;
{
register struct cmsghdr *cp;
struct mbuf *m;
if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
return ((struct mbuf *) NULL);
cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
bcopy(p, CMSG_DATA(cp), size);
size = CMSG_LEN(size);
m->m_len = size;
cp->cmsg_len = size;
cp->cmsg_level = IPPROTO_IP;
cp->cmsg_type = type;
return (m);
}
/*
* Notify a udp user of an asynchronous error;
* just wake up so that he can collect error status.
*/
static void
udp_notify(inp, errno)
register struct inpcb *inp;
int errno;
{
inp->inp_socket->so_error = errno;
sorwakeup(inp->inp_socket);
sowwakeup(inp->inp_socket);
}
#ifdef INET6
void
udp6_ctlinput(cmd, sa, d)
int cmd;
struct sockaddr *sa;
void *d;
{
struct udphdr uh;
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
register struct ip6_hdr *ip6;
struct mbuf *m;
int off;
void *cmdarg;
struct ip6ctlparam *ip6cp = NULL;
const struct sockaddr_in6 *sa6_src = NULL;
struct udp_portonly {
u_int16_t uh_sport;
u_int16_t uh_dport;
} *uhp;
void (*notify)(struct inpcb *, int) = udp_notify;
if (sa == NULL)
return;
if (sa->sa_family != AF_INET6 ||
sa->sa_len != sizeof(struct sockaddr_in6))
return;
if ((unsigned)cmd >= PRC_NCMDS)
return;
if (PRC_IS_REDIRECT(cmd))
notify = in_rtchange, d = NULL;
else if (cmd == PRC_HOSTDEAD)
d = NULL;
else if (cmd == PRC_MSGSIZE)
; /* special code is present, see below */
else if (inet6ctlerrmap[cmd] == 0)
return;
/* if the parameter is from icmp6, decode it. */
if (d != NULL) {
ip6cp = (struct ip6ctlparam *)d;
m = ip6cp->ip6c_m;
ip6 = ip6cp->ip6c_ip6;
off = ip6cp->ip6c_off;
cmdarg = ip6cp->ip6c_cmdarg;
sa6_src = ip6cp->ip6c_src;
} else {
m = NULL;
ip6 = NULL;
cmdarg = NULL;
sa6_src = &sa6_any;
}
if (ip6) {
/*
* XXX: We assume that when IPV6 is non NULL,
* M and OFF are valid.
*/
/* check if we can safely examine src and dst ports */
if (m->m_pkthdr.len < off + sizeof(*uhp)) {
if (cmd == PRC_MSGSIZE)
icmp6_mtudisc_update((struct ip6ctlparam *)d,
sa6, 0);
return;
}
bzero(&uh, sizeof(uh));
m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
if (cmd == PRC_MSGSIZE) {
int valid = 0;
/*
* Check to see if we have a valid UDP socket
* corresponding to the address in the ICMPv6 message
* payload.
*/
if (in6_pcbhashlookup(&udbtable, sa6,
uh.uh_dport,
(struct sockaddr_in6 *)sa6_src,
uh.uh_sport))
valid = 1;
else if (in_pcblookup(&udbtable, sa6,
uh.uh_dport,
(struct sockaddr_in6 *)sa6_src,
uh.uh_sport, INPLOOKUP_IPV6))
valid = 1;
#if 0
/*
* As the use of sendto(2) is fairly popular,
* we may want to allow non-connected pcb too.
* But it could be too weak against attacks...
* We should at least check if the local address (= s)
* is really ours.