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
|
/*
* Copyright (c) 1982, 1986, 1991, 1993, 1995
* 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.
*
* @(#)in_pcb.c 8.4 (Berkeley) 5/24/95
* $Id: in_pcb.c,v 1.44 1998/05/15 20:11:32 wollman Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <machine/limits.h>
#include <vm/vm_zone.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
struct in_addr zeroin_addr;
static void in_pcbremlists __P((struct inpcb *));
static void in_rtchange __P((struct inpcb *, int));
/*
* These configure the range of local port addresses assigned to
* "unspecified" outgoing connections/packets/whatever.
*/
static int ipport_lowfirstauto = IPPORT_RESERVED - 1; /* 1023 */
static int ipport_lowlastauto = IPPORT_RESERVEDSTART; /* 600 */
static int ipport_firstauto = IPPORT_RESERVED; /* 1024 */
static int ipport_lastauto = IPPORT_USERRESERVED; /* 5000 */
static int ipport_hifirstauto = IPPORT_HIFIRSTAUTO; /* 49152 */
static int ipport_hilastauto = IPPORT_HILASTAUTO; /* 65535 */
#define RANGECHK(var, min, max) \
if ((var) < (min)) { (var) = (min); } \
else if ((var) > (max)) { (var) = (max); }
static int
sysctl_net_ipport_check SYSCTL_HANDLER_ARGS
{
int error = sysctl_handle_int(oidp,
oidp->oid_arg1, oidp->oid_arg2, req);
if (!error) {
RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
}
return error;
}
#undef RANGECHK
SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
&ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
&ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
&ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
&ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
&ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
&ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
/*
* in_pcb.c: manage the Protocol Control Blocks.
*
* NOTE: It is assumed that most of these functions will be called at
* splnet(). XXX - There are, unfortunately, a few exceptions to this
* rule that should be fixed.
*/
/*
* Allocate a PCB and associate it with the socket.
*/
int
in_pcballoc(so, pcbinfo, p)
struct socket *so;
struct inpcbinfo *pcbinfo;
struct proc *p;
{
register struct inpcb *inp;
inp = zalloci(pcbinfo->ipi_zone);
if (inp == NULL)
return (ENOBUFS);
bzero((caddr_t)inp, sizeof(*inp));
inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
inp->inp_pcbinfo = pcbinfo;
inp->inp_socket = so;
LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
pcbinfo->ipi_count++;
so->so_pcb = (caddr_t)inp;
return (0);
}
int
in_pcbbind(inp, nam, p)
register struct inpcb *inp;
struct sockaddr *nam;
struct proc *p;
{
register struct socket *so = inp->inp_socket;
unsigned short *lastport;
struct sockaddr_in *sin;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
u_short lport = 0;
int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
int error;
if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
return (EADDRNOTAVAIL);
if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY)
return (EINVAL);
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
wild = 1;
if (nam) {
sin = (struct sockaddr_in *)nam;
if (nam->sa_len != sizeof (*sin))
return (EINVAL);
#ifdef notdef
/*
* We should check the family, but old programs
* incorrectly fail to initialize it.
*/
if (sin->sin_family != AF_INET)
return (EAFNOSUPPORT);
#endif
lport = sin->sin_port;
if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
/*
* Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
* allow complete duplication of binding if
* SO_REUSEPORT is set, or if SO_REUSEADDR is set
* and a multicast address is bound on both
* new and duplicated sockets.
*/
if (so->so_options & SO_REUSEADDR)
reuseport = SO_REUSEADDR|SO_REUSEPORT;
} else if (sin->sin_addr.s_addr != INADDR_ANY) {
sin->sin_port = 0; /* yech... */
if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
return (EADDRNOTAVAIL);
}
if (lport) {
struct inpcb *t;
/* GROSS */
if (ntohs(lport) < IPPORT_RESERVED && p &&
suser(p->p_ucred, &p->p_acflag))
return (EACCES);
if (so->so_uid &&
!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
t = in_pcblookup_local(inp->inp_pcbinfo,
sin->sin_addr, lport, INPLOOKUP_WILDCARD);
if (t &&
(ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
(t->inp_socket->so_options &
SO_REUSEPORT) == 0) &&
(so->so_uid != t->inp_socket->so_uid))
return (EADDRINUSE);
}
t = in_pcblookup_local(pcbinfo, sin->sin_addr,
lport, wild);
if (t && (reuseport & t->inp_socket->so_options) == 0)
return (EADDRINUSE);
}
inp->inp_laddr = sin->sin_addr;
}
if (lport == 0) {
ushort first, last;
int count;
inp->inp_flags |= INP_ANONPORT;
if (inp->inp_flags & INP_HIGHPORT) {
first = ipport_hifirstauto; /* sysctl */
last = ipport_hilastauto;
lastport = &pcbinfo->lasthi;
} else if (inp->inp_flags & INP_LOWPORT) {
if (p && (error = suser(p->p_ucred, &p->p_acflag)))
return error;
first = ipport_lowfirstauto; /* 1023 */
last = ipport_lowlastauto; /* 600 */
lastport = &pcbinfo->lastlow;
} else {
first = ipport_firstauto; /* sysctl */
last = ipport_lastauto;
lastport = &pcbinfo->lastport;
}
/*
* Simple check to ensure all ports are not used up causing
* a deadlock here.
*
* We split the two cases (up and down) so that the direction
* is not being tested on each round of the loop.
*/
if (first > last) {
/*
* counting down
*/
count = first - last;
do {
if (count-- < 0) { /* completely used? */
/*
* Undo any address bind that may have
* occurred above.
*/
inp->inp_laddr.s_addr = INADDR_ANY;
return (EAGAIN);
}
--*lastport;
if (*lastport > first || *lastport < last)
*lastport = first;
lport = htons(*lastport);
} while (in_pcblookup_local(pcbinfo,
inp->inp_laddr, lport, wild));
} else {
/*
* counting up
*/
count = last - first;
do {
if (count-- < 0) { /* completely used? */
/*
* Undo any address bind that may have
* occurred above.
*/
inp->inp_laddr.s_addr = INADDR_ANY;
return (EAGAIN);
}
++*lastport;
if (*lastport < first || *lastport > last)
*lastport = first;
lport = htons(*lastport);
} while (in_pcblookup_local(pcbinfo,
inp->inp_laddr, lport, wild));
}
}
inp->inp_lport = lport;
if (in_pcbinshash(inp) != 0) {
inp->inp_laddr.s_addr = INADDR_ANY;
inp->inp_lport = 0;
return (EAGAIN);
}
return (0);
}
/*
* Transform old in_pcbconnect() into an inner subroutine for new
* in_pcbconnect(): Do some validity-checking on the remote
* address (in mbuf 'nam') and then determine local host address
* (i.e., which interface) to use to access that remote host.
*
* This preserves definition of in_pcbconnect(), while supporting a
* slightly different version for T/TCP. (This is more than
* a bit of a kludge, but cleaning up the internal interfaces would
* have forced minor changes in every protocol).
*/
int
in_pcbladdr(inp, nam, plocal_sin)
register struct inpcb *inp;
struct sockaddr *nam;
struct sockaddr_in **plocal_sin;
{
struct in_ifaddr *ia;
register struct sockaddr_in *sin = (struct sockaddr_in *)nam;
if (nam->sa_len != sizeof (*sin))
return (EINVAL);
if (sin->sin_family != AF_INET)
return (EAFNOSUPPORT);
if (sin->sin_port == 0)
return (EADDRNOTAVAIL);
if (!TAILQ_EMPTY(&in_ifaddrhead)) {
/*
* If the destination address is INADDR_ANY,
* use the primary local address.
* If the supplied address is INADDR_BROADCAST,
* and the primary interface supports broadcast,
* choose the broadcast address for that interface.
*/
#define satosin(sa) ((struct sockaddr_in *)(sa))
#define sintosa(sin) ((struct sockaddr *)(sin))
#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
if (sin->sin_addr.s_addr == INADDR_ANY)
sin->sin_addr = IA_SIN(in_ifaddrhead.tqh_first)->sin_addr;
else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
(in_ifaddrhead.tqh_first->ia_ifp->if_flags & IFF_BROADCAST))
sin->sin_addr = satosin(&in_ifaddrhead.tqh_first->ia_broadaddr)->sin_addr;
}
if (inp->inp_laddr.s_addr == INADDR_ANY) {
register struct route *ro;
ia = (struct in_ifaddr *)0;
/*
* If route is known or can be allocated now,
* our src addr is taken from the i/f, else punt.
*/
ro = &inp->inp_route;
if (ro->ro_rt &&
(satosin(&ro->ro_dst)->sin_addr.s_addr !=
sin->sin_addr.s_addr ||
inp->inp_socket->so_options & SO_DONTROUTE)) {
RTFREE(ro->ro_rt);
ro->ro_rt = (struct rtentry *)0;
}
if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
(ro->ro_rt == (struct rtentry *)0 ||
ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
/* No route yet, so try to acquire one */
ro->ro_dst.sa_family = AF_INET;
ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
sin->sin_addr;
rtalloc(ro);
}
/*
* If we found a route, use the address
* corresponding to the outgoing interface
* unless it is the loopback (in case a route
* to our address on another net goes to loopback).
*/
if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
ia = ifatoia(ro->ro_rt->rt_ifa);
if (ia == 0) {
u_short fport = sin->sin_port;
sin->sin_port = 0;
ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
if (ia == 0)
ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
sin->sin_port = fport;
if (ia == 0)
ia = in_ifaddrhead.tqh_first;
if (ia == 0)
return (EADDRNOTAVAIL);
}
/*
* If the destination address is multicast and an outgoing
* interface has been set as a multicast option, use the
* address of that interface as our source address.
*/
if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
inp->inp_moptions != NULL) {
struct ip_moptions *imo;
struct ifnet *ifp;
imo = inp->inp_moptions;
if (imo->imo_multicast_ifp != NULL) {
ifp = imo->imo_multicast_ifp;
for (ia = in_ifaddrhead.tqh_first; ia;
ia = ia->ia_link.tqe_next)
if (ia->ia_ifp == ifp)
break;
if (ia == 0)
return (EADDRNOTAVAIL);
}
}
/*
* Don't do pcblookup call here; return interface in plocal_sin
* and exit to caller, that will do the lookup.
*/
*plocal_sin = &ia->ia_addr;
}
return(0);
}
/*
* Outer subroutine:
* Connect from a socket to a specified address.
* Both address and port must be specified in argument sin.
* If don't have a local address for this socket yet,
* then pick one.
*/
int
in_pcbconnect(inp, nam, p)
register struct inpcb *inp;
struct sockaddr *nam;
struct proc *p;
{
struct sockaddr_in *ifaddr;
register struct sockaddr_in *sin = (struct sockaddr_in *)nam;
int error;
/*
* Call inner routine, to assign local interface address.
*/
if (error = in_pcbladdr(inp, nam, &ifaddr))
return(error);
if (in_pcblookup_hash(inp->inp_pcbinfo, sin->sin_addr, sin->sin_port,
inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
inp->inp_lport, 0) != NULL) {
return (EADDRINUSE);
}
if (inp->inp_laddr.s_addr == INADDR_ANY) {
if (inp->inp_lport == 0)
(void)in_pcbbind(inp, (struct sockaddr *)0, p);
inp->inp_laddr = ifaddr->sin_addr;
}
inp->inp_faddr = sin->sin_addr;
inp->inp_fport = sin->sin_port;
in_pcbrehash(inp);
return (0);
}
void
in_pcbdisconnect(inp)
struct inpcb *inp;
{
inp->inp_faddr.s_addr = INADDR_ANY;
inp->inp_fport = 0;
in_pcbrehash(inp);
if (inp->inp_socket->so_state & SS_NOFDREF)
in_pcbdetach(inp);
}
void
in_pcbdetach(inp)
struct inpcb *inp;
{
struct socket *so = inp->inp_socket;
struct inpcbinfo *ipi = inp->inp_pcbinfo;
inp->inp_gencnt = ++ipi->ipi_gencnt;
in_pcbremlists(inp);
so->so_pcb = 0;
sofree(so);
if (inp->inp_options)
(void)m_free(inp->inp_options);
if (inp->inp_route.ro_rt)
rtfree(inp->inp_route.ro_rt);
ip_freemoptions(inp->inp_moptions);
zfreei(ipi->ipi_zone, inp);
}
/*
* The calling convention of in_setsockaddr() and in_setpeeraddr() was
* modified to match the pru_sockaddr() and pru_peeraddr() entry points
* in struct pr_usrreqs, so that protocols can just reference then directly
* without the need for a wrapper function. The socket must have a valid
* (i.e., non-nil) PCB, but it should be impossible to get an invalid one
* except through a kernel programming error, so it is acceptable to panic
* (or in this case trap) if the PCB is invalid. (Actually, we don't trap
* because there actually /is/ a programming error somewhere... XXX)
*/
int
in_setsockaddr(so, nam)
struct socket *so;
struct sockaddr **nam;
{
int s;
register struct inpcb *inp;
register struct sockaddr_in *sin;
/*
* Do the malloc first in case it blocks.
*/
MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, M_WAITOK);
bzero(sin, sizeof *sin);
sin->sin_family = AF_INET;
sin->sin_len = sizeof(*sin);
s = splnet();
inp = sotoinpcb(so);
if (!inp) {
splx(s);
free(sin, M_SONAME);
return EINVAL;
}
sin->sin_port = inp->inp_lport;
sin->sin_addr = inp->inp_laddr;
splx(s);
*nam = (struct sockaddr *)sin;
return 0;
}
int
in_setpeeraddr(so, nam)
struct socket *so;
struct sockaddr **nam;
{
int s;
struct inpcb *inp;
register struct sockaddr_in *sin;
/*
* Do the malloc first in case it blocks.
*/
MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, M_WAITOK);
bzero((caddr_t)sin, sizeof (*sin));
sin->sin_family = AF_INET;
sin->sin_len = sizeof(*sin);
s = splnet();
inp = sotoinpcb(so);
if (!inp) {
splx(s);
free(sin, M_SONAME);
return EINVAL;
}
sin->sin_port = inp->inp_fport;
sin->sin_addr = inp->inp_faddr;
splx(s);
*nam = (struct sockaddr *)sin;
return 0;
}
/*
* Pass some notification to all connections of a protocol
* associated with address dst. The local address and/or port numbers
* may be specified to limit the search. The "usual action" will be
* taken, depending on the ctlinput cmd. The caller must filter any
* cmds that are uninteresting (e.g., no error in the map).
* Call the protocol specific routine (if any) to report
* any errors for each matching socket.
*/
void
in_pcbnotify(head, dst, fport_arg, laddr, lport_arg, cmd, notify)
struct inpcbhead *head;
struct sockaddr *dst;
u_int fport_arg, lport_arg;
struct in_addr laddr;
int cmd;
void (*notify) __P((struct inpcb *, int));
{
register struct inpcb *inp, *oinp;
struct in_addr faddr;
u_short fport = fport_arg, lport = lport_arg;
int errno, s;
if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET)
return;
faddr = ((struct sockaddr_in *)dst)->sin_addr;
if (faddr.s_addr == INADDR_ANY)
return;
/*
* Redirects go to all references to the destination,
* and use in_rtchange to invalidate the route cache.
* Dead host indications: notify all references to the destination.
* Otherwise, if we have knowledge of the local port and address,
* deliver only to that socket.
*/
if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
fport = 0;
lport = 0;
laddr.s_addr = 0;
if (cmd != PRC_HOSTDEAD)
notify = in_rtchange;
}
errno = inetctlerrmap[cmd];
s = splnet();
for (inp = head->lh_first; inp != NULL;) {
if (inp->inp_faddr.s_addr != faddr.s_addr ||
inp->inp_socket == 0 ||
(lport && inp->inp_lport != lport) ||
(laddr.s_addr && inp->inp_laddr.s_addr != laddr.s_addr) ||
(fport && inp->inp_fport != fport)) {
inp = inp->inp_list.le_next;
continue;
}
oinp = inp;
inp = inp->inp_list.le_next;
if (notify)
(*notify)(oinp, errno);
}
splx(s);
}
/*
* Check for alternatives when higher level complains
* about service problems. For now, invalidate cached
* routing information. If the route was created dynamically
* (by a redirect), time to try a default gateway again.
*/
void
in_losing(inp)
struct inpcb *inp;
{
register struct rtentry *rt;
struct rt_addrinfo info;
if ((rt = inp->inp_route.ro_rt)) {
inp->inp_route.ro_rt = 0;
bzero((caddr_t)&info, sizeof(info));
info.rti_info[RTAX_DST] =
(struct sockaddr *)&inp->inp_route.ro_dst;
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
if (rt->rt_flags & RTF_DYNAMIC)
(void) rtrequest(RTM_DELETE, rt_key(rt),
rt->rt_gateway, rt_mask(rt), rt->rt_flags,
(struct rtentry **)0);
else
/*
* A new route can be allocated
* the next time output is attempted.
*/
rtfree(rt);
}
}
/*
* After a routing change, flush old routing
* and allocate a (hopefully) better one.
*/
static void
in_rtchange(inp, errno)
register struct inpcb *inp;
int errno;
{
if (inp->inp_route.ro_rt) {
rtfree(inp->inp_route.ro_rt);
inp->inp_route.ro_rt = 0;
/*
* A new route can be allocated the next time
* output is attempted.
*/
}
}
/*
* Lookup a PCB based on the local address and port.
*/
struct inpcb *
in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
struct inpcbinfo *pcbinfo;
struct in_addr laddr;
u_int lport_arg;
int wild_okay;
{
register struct inpcb *inp, *match = NULL;
int matchwild = 3, wildcard;
u_short lport = lport_arg;
if (!wild_okay) {
struct inpcbhead *head;
/*
* Look for an unconnected (wildcard foreign addr) PCB that
* matches the local address and port we're looking for.
*/
head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
if (inp->inp_faddr.s_addr == INADDR_ANY &&
inp->inp_laddr.s_addr == laddr.s_addr &&
inp->inp_lport == lport) {
/*
* Found.
*/
return (inp);
}
}
/*
* Not found.
*/
return (NULL);
} else {
struct inpcbporthead *porthash;
struct inpcbport *phd;
struct inpcb *match = NULL;
/*
* Best fit PCB lookup.
*
* First see if this local port is in use by looking on the
* port hash list.
*/
porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
pcbinfo->porthashmask)];
for (phd = porthash->lh_first; phd != NULL; phd = phd->phd_hash.le_next) {
if (phd->phd_port == lport)
break;
}
if (phd != NULL) {
/*
* Port is in use by one or more PCBs. Look for best
* fit.
*/
for (inp = phd->phd_pcblist.lh_first; inp != NULL;
inp = inp->inp_portlist.le_next) {
wildcard = 0;
if (inp->inp_faddr.s_addr != INADDR_ANY)
wildcard++;
if (inp->inp_laddr.s_addr != INADDR_ANY) {
if (laddr.s_addr == INADDR_ANY)
wildcard++;
else if (inp->inp_laddr.s_addr != laddr.s_addr)
continue;
} else {
if (laddr.s_addr != INADDR_ANY)
wildcard++;
}
if (wildcard < matchwild) {
match = inp;
matchwild = wildcard;
if (matchwild == 0) {
break;
}
}
}
}
return (match);
}
}
/*
* Lookup PCB in hash list.
*/
struct inpcb *
in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard)
struct inpcbinfo *pcbinfo;
struct in_addr faddr, laddr;
u_int fport_arg, lport_arg;
int wildcard;
{
struct inpcbhead *head;
register struct inpcb *inp;
u_short fport = fport_arg, lport = lport_arg;
/*
* First look for an exact match.
*/
head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)];
for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
if (inp->inp_faddr.s_addr == faddr.s_addr &&
inp->inp_laddr.s_addr == laddr.s_addr &&
inp->inp_fport == fport &&
inp->inp_lport == lport) {
/*
* Found.
*/
return (inp);
}
}
if (wildcard) {
struct inpcb *local_wild = NULL;
head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
if (inp->inp_faddr.s_addr == INADDR_ANY &&
inp->inp_lport == lport) {
if (inp->inp_laddr.s_addr == laddr.s_addr)
return (inp);
else if (inp->inp_laddr.s_addr == INADDR_ANY)
local_wild = inp;
}
}
return (local_wild);
}
/*
* Not found.
*/
return (NULL);
}
/*
* Insert PCB onto various hash lists.
*/
int
in_pcbinshash(inp)
struct inpcb *inp;
{
struct inpcbhead *pcbhash;
struct inpcbporthead *pcbporthash;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
struct inpcbport *phd;
pcbhash = &pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
pcbporthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(inp->inp_lport,
pcbinfo->porthashmask)];
/*
* Go through port list and look for a head for this lport.
*/
for (phd = pcbporthash->lh_first; phd != NULL; phd = phd->phd_hash.le_next) {
if (phd->phd_port == inp->inp_lport)
break;
}
/*
* If none exists, malloc one and tack it on.
*/
if (phd == NULL) {
MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT);
if (phd == NULL) {
return (ENOBUFS); /* XXX */
}
phd->phd_port = inp->inp_lport;
LIST_INIT(&phd->phd_pcblist);
LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
}
inp->inp_phd = phd;
LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
return (0);
}
/*
* Move PCB to the proper hash bucket when { faddr, fport } have been
* changed. NOTE: This does not handle the case of the lport changing (the
* hashed port list would have to be updated as well), so the lport must
* not change after in_pcbinshash() has been called.
*/
void
in_pcbrehash(inp)
struct inpcb *inp;
{
struct inpcbhead *head;
head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];
LIST_REMOVE(inp, inp_hash);
LIST_INSERT_HEAD(head, inp, inp_hash);
}
/*
* Remove PCB from various lists.
*/
static void
in_pcbremlists(inp)
struct inpcb *inp;
{
inp->inp_gencnt = ++inp->inp_pcbinfo->ipi_gencnt;
if (inp->inp_lport) {
struct inpcbport *phd = inp->inp_phd;
LIST_REMOVE(inp, inp_hash);
LIST_REMOVE(inp, inp_portlist);
if (phd->phd_pcblist.lh_first == NULL) {
LIST_REMOVE(phd, phd_hash);
free(phd, M_PCB);
}
}
LIST_REMOVE(inp, inp_list);
inp->inp_pcbinfo->ipi_count--;
}
|