/
rtsock_shared.c
1710 lines (1536 loc) · 43 KB
/
rtsock_shared.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
/* $NetBSD: rtsock_shared.c,v 1.11 2019/10/14 16:43:04 maxv Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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.
*/
/*
* Copyright (c) 1988, 1991, 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. 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.
*
* @(#)rtsock.c 8.7 (Berkeley) 10/12/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtsock_shared.c,v 1.11 2019/10/14 16:43:04 maxv Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_net_mpsafe.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/sysctl.h>
#include <sys/kauth.h>
#include <sys/kmem.h>
#include <sys/intr.h>
#include <sys/condvar.h>
#include <sys/compat_stub.h>
#include <net/if.h>
#include <net/if_llatbl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/raw_cb.h>
#include <netinet/in_var.h>
#include <netinet/if_inarp.h>
#include <netmpls/mpls.h>
#include <compat/net/if.h>
#include <compat/net/route.h>
#ifdef COMPAT_RTSOCK
/*
* These are used when #include-d from compat/common/rtsock_50.c
*/
#define RTM_XVERSION RTM_OVERSION
#define RTM_XNEWADDR RTM_ONEWADDR
#define RTM_XDELADDR RTM_ODELADDR
#define RTM_XCHGADDR RTM_OCHGADDR
#define RT_XADVANCE(a,b) RT_OADVANCE(a,b)
#define RT_XROUNDUP(n) RT_OROUNDUP(n)
#define PF_XROUTE PF_OROUTE
#define rt_xmsghdr rt_msghdr50
#define if_xmsghdr if_msghdr /* if_msghdr50 is for RTM_OIFINFO */
#define ifa_xmsghdr ifa_msghdr50
#define if_xannouncemsghdr if_announcemsghdr50
#define COMPATNAME(x) compat_50_ ## x
#define DOMAINNAME "oroute"
#define COMPATCALL(name, args) \
MODULE_HOOK_CALL_VOID(rtsock_ ## name ## _50_hook, args, __nothing);
#define RTS_CTASSERT(x) __nothing
CTASSERT(sizeof(struct ifa_xmsghdr) == 20);
DOMAIN_DEFINE(compat_50_routedomain); /* forward declare and add to link set */
#else /* COMPAT_RTSOCK */
/*
* These are used when #include-d from compat/common/rtsock_50.c
*/
#define RTM_XVERSION RTM_VERSION
#define RTM_XNEWADDR RTM_NEWADDR
#define RTM_XDELADDR RTM_DELADDR
#define RTM_XCHGADDR RTM_CHGADDR
#define RT_XADVANCE(a,b) RT_ADVANCE(a,b)
#define RT_XROUNDUP(n) RT_ROUNDUP(n)
#define PF_XROUTE PF_ROUTE
#define rt_xmsghdr rt_msghdr
#define if_xmsghdr if_msghdr
#define ifa_xmsghdr ifa_msghdr
#define if_xannouncemsghdr if_announcemsghdr
#define COMPATNAME(x) x
#define DOMAINNAME "route"
#define COMPATCALL(name, args) __nothing;
#define RTS_CTASSERT(x) CTASSERT(x)
CTASSERT(sizeof(struct ifa_xmsghdr) == 32);
DOMAIN_DEFINE(routedomain); /* forward declare and add to link set */
#endif /* COMPAT_RTSOCK */
#ifdef RTSOCK_DEBUG
#define RT_IN_PRINT(info, b, a) (in_print((b), sizeof(b), \
&((const struct sockaddr_in *)(info)->rti_info[(a)])->sin_addr), (b))
#endif /* RTSOCK_DEBUG */
struct route_info COMPATNAME(route_info) = {
.ri_dst = { .sa_len = 2, .sa_family = PF_XROUTE, },
.ri_src = { .sa_len = 2, .sa_family = PF_XROUTE, },
.ri_maxqlen = IFQ_MAXLEN,
};
static void COMPATNAME(route_init)(void);
static int COMPATNAME(route_output)(struct mbuf *, struct socket *);
static int rt_xaddrs(u_char, const char *, const char *, struct rt_addrinfo *);
static struct mbuf *rt_makeifannouncemsg(struct ifnet *, int, int,
struct rt_addrinfo *);
static int rt_msg2(int, struct rt_addrinfo *, void *, struct rt_walkarg *, int *);
static void _rt_setmetrics(int, const struct rt_xmsghdr *, struct rtentry *);
static void rtm_setmetrics(const struct rtentry *, struct rt_xmsghdr *);
static void rt_adjustcount(int, int);
static const struct protosw COMPATNAME(route_protosw)[];
struct routecb {
struct rawcb rocb_rcb;
unsigned int rocb_msgfilter;
#define RTMSGFILTER(m) (1U << (m))
};
#define sotoroutecb(so) ((struct routecb *)(so)->so_pcb)
static struct rawcbhead rt_rawcb;
#ifdef NET_MPSAFE
static kmutex_t *rt_so_mtx;
static bool rt_updating = false;
static kcondvar_t rt_update_cv;
#endif
static void
rt_adjustcount(int af, int cnt)
{
struct route_cb * const cb = &COMPATNAME(route_info).ri_cb;
cb->any_count += cnt;
switch (af) {
case AF_INET:
cb->ip_count += cnt;
return;
#ifdef INET6
case AF_INET6:
cb->ip6_count += cnt;
return;
#endif
case AF_MPLS:
cb->mpls_count += cnt;
return;
}
}
static int
COMPATNAME(route_filter)(struct mbuf *m, struct sockproto *proto,
struct rawcb *rp)
{
struct routecb *rop = (struct routecb *)rp;
struct rt_xmsghdr *rtm;
KASSERT(m != NULL);
KASSERT(proto != NULL);
KASSERT(rp != NULL);
/* Wrong family for this socket. */
if (proto->sp_family != PF_ROUTE)
return ENOPROTOOPT;
/* If no filter set, just return. */
if (rop->rocb_msgfilter == 0)
return 0;
/* Ensure we can access rtm_type */
if (m->m_len <
offsetof(struct rt_xmsghdr, rtm_type) + sizeof(rtm->rtm_type))
return EINVAL;
rtm = mtod(m, struct rt_xmsghdr *);
if (rtm->rtm_type >= sizeof(rop->rocb_msgfilter) * CHAR_BIT)
return EINVAL;
/* If the rtm type is filtered out, return a positive. */
if (!(rop->rocb_msgfilter & RTMSGFILTER(rtm->rtm_type)))
return EEXIST;
/* Passed the filter. */
return 0;
}
static void
rt_pr_init(void)
{
LIST_INIT(&rt_rawcb);
}
static int
COMPATNAME(route_attach)(struct socket *so, int proto)
{
struct rawcb *rp;
struct routecb *rop;
int s, error;
KASSERT(sotorawcb(so) == NULL);
rop = kmem_zalloc(sizeof(*rop), KM_SLEEP);
rp = &rop->rocb_rcb;
rp->rcb_len = sizeof(*rop);
so->so_pcb = rp;
s = splsoftnet();
#ifdef NET_MPSAFE
KASSERT(so->so_lock == NULL);
mutex_obj_hold(rt_so_mtx);
so->so_lock = rt_so_mtx;
solock(so);
#endif
if ((error = raw_attach(so, proto, &rt_rawcb)) == 0) {
rt_adjustcount(rp->rcb_proto.sp_protocol, 1);
rp->rcb_laddr = &COMPATNAME(route_info).ri_src;
rp->rcb_faddr = &COMPATNAME(route_info).ri_dst;
rp->rcb_filter = COMPATNAME(route_filter);
}
splx(s);
if (error) {
kmem_free(rop, sizeof(*rop));
so->so_pcb = NULL;
return error;
}
soisconnected(so);
so->so_options |= SO_USELOOPBACK;
KASSERT(solocked(so));
return error;
}
static void
COMPATNAME(route_detach)(struct socket *so)
{
struct rawcb *rp = sotorawcb(so);
int s;
KASSERT(rp != NULL);
KASSERT(solocked(so));
s = splsoftnet();
rt_adjustcount(rp->rcb_proto.sp_protocol, -1);
raw_detach(so);
splx(s);
}
static int
COMPATNAME(route_accept)(struct socket *so, struct sockaddr *nam)
{
KASSERT(solocked(so));
panic("route_accept");
return EOPNOTSUPP;
}
static int
COMPATNAME(route_bind)(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_listen)(struct socket *so, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_connect)(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_connect2)(struct socket *so, struct socket *so2)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_disconnect)(struct socket *so)
{
struct rawcb *rp = sotorawcb(so);
int s;
KASSERT(solocked(so));
KASSERT(rp != NULL);
s = splsoftnet();
soisdisconnected(so);
raw_disconnect(rp);
splx(s);
return 0;
}
static int
COMPATNAME(route_shutdown)(struct socket *so)
{
int s;
KASSERT(solocked(so));
/*
* Mark the connection as being incapable of further input.
*/
s = splsoftnet();
socantsendmore(so);
splx(s);
return 0;
}
static int
COMPATNAME(route_abort)(struct socket *so)
{
KASSERT(solocked(so));
panic("route_abort");
return EOPNOTSUPP;
}
static int
COMPATNAME(route_ioctl)(struct socket *so, u_long cmd, void *nam,
struct ifnet * ifp)
{
return EOPNOTSUPP;
}
static int
COMPATNAME(route_stat)(struct socket *so, struct stat *ub)
{
KASSERT(solocked(so));
return 0;
}
static int
COMPATNAME(route_peeraddr)(struct socket *so, struct sockaddr *nam)
{
struct rawcb *rp = sotorawcb(so);
KASSERT(solocked(so));
KASSERT(rp != NULL);
KASSERT(nam != NULL);
if (rp->rcb_faddr == NULL)
return ENOTCONN;
raw_setpeeraddr(rp, nam);
return 0;
}
static int
COMPATNAME(route_sockaddr)(struct socket *so, struct sockaddr *nam)
{
struct rawcb *rp = sotorawcb(so);
KASSERT(solocked(so));
KASSERT(rp != NULL);
KASSERT(nam != NULL);
if (rp->rcb_faddr == NULL)
return ENOTCONN;
raw_setsockaddr(rp, nam);
return 0;
}
static int
COMPATNAME(route_rcvd)(struct socket *so, int flags, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_recvoob)(struct socket *so, struct mbuf *m, int flags)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_send)(struct socket *so, struct mbuf *m,
struct sockaddr *nam, struct mbuf *control, struct lwp *l)
{
int error = 0;
int s;
KASSERT(solocked(so));
KASSERT(so->so_proto == &COMPATNAME(route_protosw)[0]);
s = splsoftnet();
error = raw_send(so, m, nam, control, l, &COMPATNAME(route_output));
splx(s);
return error;
}
static int
COMPATNAME(route_sendoob)(struct socket *so, struct mbuf *m,
struct mbuf *control)
{
KASSERT(solocked(so));
m_freem(m);
m_freem(control);
return EOPNOTSUPP;
}
static int
COMPATNAME(route_purgeif)(struct socket *so, struct ifnet *ifp)
{
panic("route_purgeif");
return EOPNOTSUPP;
}
#if defined(INET) || defined(INET6)
static int
route_get_sdl_index(struct rt_addrinfo *info, int *sdl_index)
{
struct rtentry *nrt;
int error;
error = rtrequest1(RTM_GET, info, &nrt);
if (error != 0)
return error;
/*
* nrt->rt_ifp->if_index may not be correct
* due to changing to ifplo0.
*/
*sdl_index = satosdl(nrt->rt_gateway)->sdl_index;
rt_unref(nrt);
return 0;
}
#endif
static void
route_get_sdl(const struct ifnet *ifp, const struct sockaddr *dst,
struct sockaddr_dl *sdl, int *flags)
{
struct llentry *la;
KASSERT(ifp != NULL);
IF_AFDATA_RLOCK(ifp);
switch (dst->sa_family) {
case AF_INET:
la = lla_lookup(LLTABLE(ifp), 0, dst);
break;
case AF_INET6:
la = lla_lookup(LLTABLE6(ifp), 0, dst);
break;
default:
la = NULL;
KASSERTMSG(0, "Invalid AF=%d\n", dst->sa_family);
break;
}
IF_AFDATA_RUNLOCK(ifp);
void *a = (LLE_IS_VALID(la) && (la->la_flags & LLE_VALID) == LLE_VALID)
? &la->ll_addr : NULL;
a = sockaddr_dl_init(sdl, sizeof(*sdl), ifp->if_index, ifp->if_type,
NULL, 0, a, ifp->if_addrlen);
KASSERT(a != NULL);
if (la != NULL) {
*flags = la->la_flags;
LLE_RUNLOCK(la);
}
}
static int
route_output_report(struct rtentry *rt, struct rt_addrinfo *info,
struct rt_xmsghdr *rtm, struct rt_xmsghdr **new_rtm)
{
int len, error;
if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
const struct ifaddr *rtifa;
const struct ifnet *ifp = rt->rt_ifp;
info->rti_info[RTAX_IFP] = ifp->if_dl->ifa_addr;
/* rtifa used to be simply rt->rt_ifa.
* If rt->rt_ifa != NULL, then
* rt_get_ifa() != NULL. So this
* ought to still be safe. --dyoung
*/
rtifa = rt_get_ifa(rt);
info->rti_info[RTAX_IFA] = rtifa->ifa_addr;
#ifdef RTSOCK_DEBUG
if (info->rti_info[RTAX_IFA]->sa_family == AF_INET) {
char ibuf[INET_ADDRSTRLEN];
char abuf[INET_ADDRSTRLEN];
printf("%s: copying out RTAX_IFA %s "
"for info->rti_info[RTAX_DST] %s "
"ifa_getifa %p ifa_seqno %p\n",
__func__,
RT_IN_PRINT(info, ibuf, RTAX_IFA),
RT_IN_PRINT(info, abuf, RTAX_DST),
(void *)rtifa->ifa_getifa,
rtifa->ifa_seqno);
}
#endif /* RTSOCK_DEBUG */
if (ifp->if_flags & IFF_POINTOPOINT)
info->rti_info[RTAX_BRD] = rtifa->ifa_dstaddr;
else
info->rti_info[RTAX_BRD] = NULL;
rtm->rtm_index = ifp->if_index;
}
error = rt_msg2(rtm->rtm_type, info, NULL, NULL, &len);
if (error)
return error;
if (len > rtm->rtm_msglen) {
struct rt_xmsghdr *old_rtm = rtm;
R_Malloc(*new_rtm, struct rt_xmsghdr *, len);
if (*new_rtm == NULL)
return ENOBUFS;
(void)memcpy(*new_rtm, old_rtm, old_rtm->rtm_msglen);
rtm = *new_rtm;
}
(void)rt_msg2(rtm->rtm_type, info, rtm, NULL, 0);
rtm->rtm_flags = rt->rt_flags;
rtm_setmetrics(rt, rtm);
rtm->rtm_addrs = info->rti_addrs;
return 0;
}
/*ARGSUSED*/
int
COMPATNAME(route_output)(struct mbuf *m, struct socket *so)
{
struct sockproto proto = { .sp_family = PF_XROUTE, };
struct rt_xmsghdr *rtm = NULL;
struct rt_xmsghdr *old_rtm = NULL, *new_rtm = NULL;
struct rtentry *rt = NULL;
struct rtentry *saved_nrt = NULL;
struct rt_addrinfo info;
int len, error = 0;
sa_family_t family;
struct sockaddr_dl sdl;
int bound = curlwp_bind();
bool do_rt_free = false;
struct sockaddr_storage netmask;
#define senderr(e) do { error = e; goto flush;} while (/*CONSTCOND*/ 0)
if (m == NULL || ((m->m_len < sizeof(int32_t)) &&
(m = m_pullup(m, sizeof(int32_t))) == NULL)) {
error = ENOBUFS;
goto out;
}
if ((m->m_flags & M_PKTHDR) == 0)
panic("%s", __func__);
len = m->m_pkthdr.len;
if (len < sizeof(*rtm) ||
len != mtod(m, struct rt_xmsghdr *)->rtm_msglen) {
info.rti_info[RTAX_DST] = NULL;
senderr(EINVAL);
}
R_Malloc(rtm, struct rt_xmsghdr *, len);
if (rtm == NULL) {
info.rti_info[RTAX_DST] = NULL;
senderr(ENOBUFS);
}
m_copydata(m, 0, len, rtm);
if (rtm->rtm_version != RTM_XVERSION) {
info.rti_info[RTAX_DST] = NULL;
senderr(EPROTONOSUPPORT);
}
rtm->rtm_pid = curproc->p_pid;
memset(&info, 0, sizeof(info));
info.rti_addrs = rtm->rtm_addrs;
if (rt_xaddrs(rtm->rtm_type, (const char *)(rtm + 1), len + (char *)rtm,
&info)) {
senderr(EINVAL);
}
info.rti_flags = rtm->rtm_flags;
#ifdef RTSOCK_DEBUG
if (info.rti_info[RTAX_DST]->sa_family == AF_INET) {
char abuf[INET_ADDRSTRLEN];
printf("%s: extracted info.rti_info[RTAX_DST] %s\n", __func__,
RT_IN_PRINT(&info, abuf, RTAX_DST));
}
#endif /* RTSOCK_DEBUG */
if (info.rti_info[RTAX_DST] == NULL ||
(info.rti_info[RTAX_DST]->sa_family >= AF_MAX)) {
senderr(EINVAL);
}
if (info.rti_info[RTAX_GATEWAY] != NULL &&
(info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX)) {
senderr(EINVAL);
}
/*
* Verify that the caller has the appropriate privilege; RTM_GET
* is the only operation the non-superuser is allowed.
*/
if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_ROUTE,
0, rtm, NULL, NULL) != 0)
senderr(EACCES);
/*
* route(8) passes a sockaddr truncated with prefixlen.
* The kernel doesn't expect such sockaddr and need to
* use a buffer that is big enough for the sockaddr expected
* (padded with 0's). We keep the original length of the sockaddr.
*/
if (info.rti_info[RTAX_NETMASK]) {
/*
* Use the family of RTAX_DST, because RTAX_NETMASK
* can have a zero family if it comes from the radix
* tree via rt_mask().
*/
socklen_t sa_len = sockaddr_getsize_by_family(
info.rti_info[RTAX_DST]->sa_family);
socklen_t masklen = sockaddr_getlen(
info.rti_info[RTAX_NETMASK]);
if (sa_len != 0 && sa_len > masklen) {
KASSERT(sa_len <= sizeof(netmask));
memcpy(&netmask, info.rti_info[RTAX_NETMASK], masklen);
memset((char *)&netmask + masklen, 0, sa_len - masklen);
info.rti_info[RTAX_NETMASK] = sstocsa(&netmask);
}
}
switch (rtm->rtm_type) {
case RTM_ADD:
if (info.rti_info[RTAX_GATEWAY] == NULL) {
senderr(EINVAL);
}
#if defined(INET) || defined(INET6)
/* support for new ARP/NDP code with keeping backcompat */
if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) {
const struct sockaddr_dl *sdlp =
satocsdl(info.rti_info[RTAX_GATEWAY]);
/* Allow routing requests by interface index */
if (sdlp->sdl_nlen == 0 && sdlp->sdl_alen == 0
&& sdlp->sdl_slen == 0)
goto fallback;
/*
* Old arp binaries don't set the sdl_index
* so we have to complement it.
*/
int sdl_index = sdlp->sdl_index;
if (sdl_index == 0) {
error = route_get_sdl_index(&info, &sdl_index);
if (error != 0)
goto fallback;
} else if (
info.rti_info[RTAX_DST]->sa_family == AF_INET) {
/*
* XXX workaround for SIN_PROXY case; proxy arp
* entry should be in an interface that has
* a network route including the destination,
* not a local (link) route that may not be a
* desired place, for example a tap.
*/
const struct sockaddr_inarp *sina =
(const struct sockaddr_inarp *)
info.rti_info[RTAX_DST];
if (sina->sin_other & SIN_PROXY) {
error = route_get_sdl_index(&info,
&sdl_index);
if (error != 0)
goto fallback;
}
}
error = lla_rt_output(rtm->rtm_type, rtm->rtm_flags,
rtm->rtm_rmx.rmx_expire, &info, sdl_index);
break;
}
fallback:
#endif /* defined(INET) || defined(INET6) */
error = rtrequest1(rtm->rtm_type, &info, &saved_nrt);
if (error == 0) {
_rt_setmetrics(rtm->rtm_inits, rtm, saved_nrt);
rt_unref(saved_nrt);
}
break;
case RTM_DELETE:
#if defined(INET) || defined(INET6)
/* support for new ARP/NDP code */
if (info.rti_info[RTAX_GATEWAY] &&
(info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
(rtm->rtm_flags & RTF_LLDATA) != 0) {
const struct sockaddr_dl *sdlp =
satocsdl(info.rti_info[RTAX_GATEWAY]);
error = lla_rt_output(rtm->rtm_type, rtm->rtm_flags,
rtm->rtm_rmx.rmx_expire, &info, sdlp->sdl_index);
rtm->rtm_flags &= ~RTF_UP;
break;
}
#endif
error = rtrequest1(rtm->rtm_type, &info, &saved_nrt);
if (error != 0)
break;
rt = saved_nrt;
do_rt_free = true;
info.rti_info[RTAX_DST] = rt_getkey(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_TAG] = rt_gettag(rt);
error = route_output_report(rt, &info, rtm, &new_rtm);
if (error)
senderr(error);
if (new_rtm != NULL) {
old_rtm = rtm;
rtm = new_rtm;
}
break;
case RTM_GET:
case RTM_CHANGE:
case RTM_LOCK:
/* XXX This will mask info.rti_info[RTAX_DST] with
* info.rti_info[RTAX_NETMASK] before
* searching. It did not used to do that. --dyoung
*/
rt = NULL;
error = rtrequest1(RTM_GET, &info, &rt);
if (error != 0)
senderr(error);
if (rtm->rtm_type != RTM_GET) {/* XXX: too grotty */
if (memcmp(info.rti_info[RTAX_DST], rt_getkey(rt),
info.rti_info[RTAX_DST]->sa_len) != 0)
senderr(ESRCH);
if (info.rti_info[RTAX_NETMASK] == NULL &&
rt_mask(rt) != NULL)
senderr(ETOOMANYREFS);
}
/*
* XXX if arp/ndp requests an L2 entry, we have to obtain
* it from lltable while for the route command we have to
* return a route as it is. How to distinguish them?
* For newer arp/ndp, RTF_LLDATA flag set by arp/ndp
* indicates an L2 entry is requested. For old arp/ndp
* binaries, we check RTF_UP flag is NOT set; it works
* by the fact that arp/ndp don't set it while the route
* command sets it.
*/
if (((rtm->rtm_flags & RTF_LLDATA) != 0 ||
(rtm->rtm_flags & RTF_UP) == 0) &&
rtm->rtm_type == RTM_GET &&
sockaddr_cmp(rt_getkey(rt), info.rti_info[RTAX_DST]) != 0) {
int ll_flags = 0;
route_get_sdl(rt->rt_ifp, info.rti_info[RTAX_DST], &sdl,
&ll_flags);
info.rti_info[RTAX_GATEWAY] = sstocsa(&sdl);
error = route_output_report(rt, &info, rtm, &new_rtm);
if (error)
senderr(error);
if (new_rtm != NULL) {
old_rtm = rtm;
rtm = new_rtm;
}
rtm->rtm_flags |= RTF_LLDATA;
rtm->rtm_flags &= ~RTF_CONNECTED;
rtm->rtm_flags |= (ll_flags & LLE_STATIC) ? RTF_STATIC : 0;
break;
}
switch (rtm->rtm_type) {
case RTM_GET:
info.rti_info[RTAX_DST] = rt_getkey(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_TAG] = rt_gettag(rt);
error = route_output_report(rt, &info, rtm, &new_rtm);
if (error)
senderr(error);
if (new_rtm != NULL) {
old_rtm = rtm;
rtm = new_rtm;
}
break;
case RTM_CHANGE:
#ifdef NET_MPSAFE
/*
* Release rt_so_mtx to avoid a deadlock with route_intr
* and also serialize updating routes to avoid another.
*/
if (rt_updating) {
/* Release to allow the updater to proceed */
rt_unref(rt);
rt = NULL;
}
while (rt_updating) {
error = cv_wait_sig(&rt_update_cv, rt_so_mtx);
if (error != 0)
goto flush;
}
if (rt == NULL) {
error = rtrequest1(RTM_GET, &info, &rt);
if (error != 0)
goto flush;
}
rt_updating = true;
mutex_exit(rt_so_mtx);
error = rt_update_prepare(rt);
if (error == 0) {
error = rt_update(rt, &info, rtm);
rt_update_finish(rt);
}
mutex_enter(rt_so_mtx);
rt_updating = false;
cv_broadcast(&rt_update_cv);
#else
error = rt_update(rt, &info, rtm);
#endif
if (error != 0)
goto flush;
/*FALLTHROUGH*/
case RTM_LOCK:
rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits);
rt->rt_rmx.rmx_locks |=
(rtm->rtm_inits & rtm->rtm_rmx.rmx_locks);
break;
}
break;
default:
senderr(EOPNOTSUPP);
}
flush:
if (rtm) {
if (error)
rtm->rtm_errno = error;
else
rtm->rtm_flags |= RTF_DONE;
}
family = info.rti_info[RTAX_DST] ? info.rti_info[RTAX_DST]->sa_family :
0;
/* We cannot free old_rtm until we have stopped using the
* pointers in info, some of which may point to sockaddrs
* in old_rtm.
*/
if (old_rtm != NULL)
Free(old_rtm);
if (rt) {
if (do_rt_free) {
#ifdef NET_MPSAFE
/*
* Release rt_so_mtx to avoid a deadlock with
* route_intr.
*/
mutex_exit(rt_so_mtx);
rt_free(rt);
mutex_enter(rt_so_mtx);
#else
rt_free(rt);
#endif
} else
rt_unref(rt);
}
{
struct rawcb *rp = NULL;
/*
* Check to see if we don't want our own messages.
*/
if ((so->so_options & SO_USELOOPBACK) == 0) {
if (COMPATNAME(route_info).ri_cb.any_count <= 1) {
if (rtm)
Free(rtm);
m_freem(m);
goto out;
}
/* There is another listener, so construct message */
rp = sotorawcb(so);
}
if (rtm) {
m_copyback(m, 0, rtm->rtm_msglen, rtm);
if (m->m_pkthdr.len < rtm->rtm_msglen) {
m_freem(m);
m = NULL;
} else if (m->m_pkthdr.len > rtm->rtm_msglen)
m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
Free(rtm);
}
if (rp)
rp->rcb_proto.sp_family = 0; /* Avoid us */
if (family)
proto.sp_protocol = family;
if (m)
raw_input(m, &proto, &COMPATNAME(route_info).ri_src,
&COMPATNAME(route_info).ri_dst, &rt_rawcb);
if (rp)
rp->rcb_proto.sp_family = PF_XROUTE;
}
out:
curlwp_bindx(bound);
return error;
}
static int
route_ctloutput(int op, struct socket *so, struct sockopt *sopt)
{
struct routecb *rop = sotoroutecb(so);
int error = 0;
unsigned char *rtm_type;
size_t len;
unsigned int msgfilter;
KASSERT(solocked(so));
if (sopt->sopt_level != AF_ROUTE) {
error = ENOPROTOOPT;
} else switch (op) {
case PRCO_SETOPT:
switch (sopt->sopt_name) {
case RO_MSGFILTER:
msgfilter = 0;
for (rtm_type = sopt->sopt_data, len = sopt->sopt_size;
len != 0;
rtm_type++, len -= sizeof(*rtm_type))
{
/* Guard against overflowing our storage. */