tcp: Allow socket/syncache inheritance between SO_REUSEPORT listen sockets
[dragonfly.git] / sys / netinet / in_pcb.c
1 /*
2  * Copyright (c) 2004 Jeffrey M. Hsu.  All rights reserved.
3  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
4  *
5  * This code is derived from software contributed to The DragonFly Project
6  * by Jeffrey M. Hsu.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of The DragonFly Project nor the names of its
17  *    contributors may be used to endorse or promote products derived
18  *    from this software without specific, prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33
34 /*
35  * Copyright (c) 1982, 1986, 1991, 1993, 1995
36  *      The Regents of the University of California.  All rights reserved.
37  *
38  * Redistribution and use in source and binary forms, with or without
39  * modification, are permitted provided that the following conditions
40  * are met:
41  * 1. Redistributions of source code must retain the above copyright
42  *    notice, this list of conditions and the following disclaimer.
43  * 2. Redistributions in binary form must reproduce the above copyright
44  *    notice, this list of conditions and the following disclaimer in the
45  *    documentation and/or other materials provided with the distribution.
46  * 3. Neither the name of the University nor the names of its contributors
47  *    may be used to endorse or promote products derived from this software
48  *    without specific prior written permission.
49  *
50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60  * SUCH DAMAGE.
61  *
62  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
63  * $FreeBSD: src/sys/netinet/in_pcb.c,v 1.59.2.27 2004/01/02 04:06:42 ambrisko Exp $
64  */
65
66 #include "opt_ipsec.h"
67 #include "opt_inet6.h"
68
69 #include <sys/param.h>
70 #include <sys/systm.h>
71 #include <sys/malloc.h>
72 #include <sys/mbuf.h>
73 #include <sys/domain.h>
74 #include <sys/protosw.h>
75 #include <sys/socket.h>
76 #include <sys/socketvar.h>
77 #include <sys/proc.h>
78 #include <sys/priv.h>
79 #include <sys/jail.h>
80 #include <sys/kernel.h>
81 #include <sys/sysctl.h>
82
83 #include <sys/thread2.h>
84 #include <sys/socketvar2.h>
85 #include <sys/msgport2.h>
86
87 #include <machine/limits.h>
88
89 #include <net/if.h>
90 #include <net/if_types.h>
91 #include <net/route.h>
92
93 #include <netinet/in.h>
94 #include <netinet/in_pcb.h>
95 #include <netinet/in_var.h>
96 #include <netinet/ip_var.h>
97 #ifdef INET6
98 #include <netinet/ip6.h>
99 #include <netinet6/ip6_var.h>
100 #endif /* INET6 */
101
102 #ifdef IPSEC
103 #include <netinet6/ipsec.h>
104 #include <netproto/key/key.h>
105 #include <netproto/ipsec/esp_var.h>
106 #endif
107
108 #ifdef FAST_IPSEC
109 #if defined(IPSEC) || defined(IPSEC_ESP)
110 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
111 #endif
112
113 #include <netproto/ipsec/ipsec.h>
114 #include <netproto/ipsec/key.h>
115 #define IPSEC
116 #endif /* FAST_IPSEC */
117
118 #define INP_LOCALGROUP_SIZMIN   8
119 #define INP_LOCALGROUP_SIZMAX   256
120
121 struct in_addr zeroin_addr;
122
123 /*
124  * These configure the range of local port addresses assigned to
125  * "unspecified" outgoing connections/packets/whatever.
126  */
127 int ipport_lowfirstauto = IPPORT_RESERVED - 1;  /* 1023 */
128 int ipport_lowlastauto = IPPORT_RESERVEDSTART;  /* 600 */
129
130 int ipport_firstauto = IPPORT_RESERVED;         /* 1024 */
131 int ipport_lastauto = IPPORT_USERRESERVED;      /* 5000 */
132
133 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO;    /* 49152 */
134 int ipport_hilastauto = IPPORT_HILASTAUTO;      /* 65535 */
135
136 #define RANGECHK(var, min, max) \
137         if ((var) < (min)) { (var) = (min); } \
138         else if ((var) > (max)) { (var) = (max); }
139
140 int udpencap_enable = 1;        /* enabled by default */
141 int udpencap_port = 4500;       /* triggers decapsulation */
142
143 static int
144 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
145 {
146         int error;
147
148         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
149         if (!error) {
150                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
151                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
152
153                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
154                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
155
156                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
157                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
158         }
159         return (error);
160 }
161
162 #undef RANGECHK
163
164 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
165
166 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
167            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
168 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
169            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
170 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
171            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
172 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
173            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
174 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
175            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
176 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
177            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
178
179 /*
180  * in_pcb.c: manage the Protocol Control Blocks.
181  *
182  * NOTE: It is assumed that most of these functions will be called from
183  * a critical section.  XXX - There are, unfortunately, a few exceptions
184  * to this rule that should be fixed.
185  *
186  * NOTE: The caller should initialize the cpu field to the cpu running the
187  * protocol stack associated with this inpcbinfo.
188  */
189
190 void
191 in_pcbinfo_init(struct inpcbinfo *pcbinfo)
192 {
193         LIST_INIT(&pcbinfo->pcblisthead);
194         pcbinfo->cpu = -1;
195         pcbinfo->portsave = kmalloc(sizeof(*pcbinfo->portsave), M_PCB,
196                                     M_WAITOK | M_ZERO);
197 }
198
199 struct baddynamicports baddynamicports;
200
201 /*
202  * Check if the specified port is invalid for dynamic allocation.
203  */
204 int
205 in_baddynamic(u_int16_t port, u_int16_t proto)
206 {
207         switch (proto) {
208         case IPPROTO_TCP:
209                 return (DP_ISSET(baddynamicports.tcp, port));
210         case IPPROTO_UDP:
211 #ifdef IPSEC
212                 /* Cannot preset this as it is a sysctl */
213                 if (port == udpencap_port)
214                         return (1);
215 #endif
216                 return (DP_ISSET(baddynamicports.udp, port));
217         default:
218                 return (0);
219         }
220 }
221
222
223 /*
224  * Allocate a PCB and associate it with the socket.
225  */
226 int
227 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
228 {
229         struct inpcb *inp;
230 #ifdef IPSEC
231         int error;
232 #endif
233
234         inp = kmalloc(pcbinfo->ipi_size, M_PCB, M_WAITOK|M_ZERO|M_NULLOK);
235         if (inp == NULL)
236                 return (ENOMEM);
237         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
238         inp->inp_pcbinfo = inp->inp_cpcbinfo = pcbinfo;
239         inp->inp_socket = so;
240 #ifdef IPSEC
241         error = ipsec_init_policy(so, &inp->inp_sp);
242         if (error != 0) {
243                 kfree(inp, M_PCB);
244                 return (error);
245         }
246 #endif
247 #ifdef INET6
248         if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only)
249                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
250         if (ip6_auto_flowlabel)
251                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
252 #endif
253         soreference(so);
254         so->so_pcb = inp;
255         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
256         pcbinfo->ipi_count++;
257         return (0);
258 }
259
260 /*
261  * Unlink a pcb with the intention of moving it to another cpu with a
262  * different pcbinfo.  While unlinked nothing should attempt to dereference
263  * inp_pcbinfo, NULL it out so we assert if it does.
264  */
265 void
266 in_pcbunlink(struct inpcb *inp, struct inpcbinfo *pcbinfo)
267 {
268         KKASSERT(inp->inp_pcbinfo == pcbinfo);
269
270         LIST_REMOVE(inp, inp_list);
271         pcbinfo->ipi_count--;
272         inp->inp_pcbinfo = NULL;
273 }
274
275 /*
276  * Relink a pcb into a new pcbinfo.
277  */
278 void
279 in_pcblink(struct inpcb *inp, struct inpcbinfo *pcbinfo)
280 {
281         KKASSERT(inp->inp_pcbinfo == NULL);
282         inp->inp_pcbinfo = pcbinfo;
283         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
284         pcbinfo->ipi_count++;
285 }
286
287 int
288 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
289 {
290         struct socket *so = inp->inp_socket;
291         unsigned short *lastport;
292         struct sockaddr_in *sin;
293         struct sockaddr_in jsin;
294         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
295         struct ucred *cred = NULL;
296         u_short lport = 0;
297         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
298         int error;
299
300         if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) /* XXX broken! */
301                 return (EADDRNOTAVAIL);
302         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
303                 return (EINVAL);        /* already bound */
304
305         if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT)))
306                 wild = 1;    /* neither SO_REUSEADDR nor SO_REUSEPORT is set */
307         if (td->td_proc)
308                 cred = td->td_proc->p_ucred;
309
310         /*
311          * This has to be atomic.  If the porthash is shared across multiple
312          * protocol threads (aka tcp) then the token will be non-NULL.
313          */
314         if (pcbinfo->porttoken)
315                 lwkt_gettoken(pcbinfo->porttoken);
316
317         if (nam != NULL) {
318                 sin = (struct sockaddr_in *)nam;
319                 if (nam->sa_len != sizeof *sin) {
320                         error = EINVAL;
321                         goto done;
322                 }
323 #ifdef notdef
324                 /*
325                  * We should check the family, but old programs
326                  * incorrectly fail to initialize it.
327                  */
328                 if (sin->sin_family != AF_INET) {
329                         error = EAFNOSUPPORT;
330                         goto done;
331                 }
332 #endif
333                 if (!prison_replace_wildcards(td, nam)) {
334                         error = EINVAL;
335                         goto done;
336                 }
337                 lport = sin->sin_port;
338                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
339                         /*
340                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
341                          * allow complete duplication of binding if
342                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
343                          * and a multicast address is bound on both
344                          * new and duplicated sockets.
345                          */
346                         if (so->so_options & SO_REUSEADDR)
347                                 reuseport = SO_REUSEADDR | SO_REUSEPORT;
348                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
349                         sin->sin_port = 0;              /* yech... */
350                         bzero(&sin->sin_zero, sizeof sin->sin_zero);
351                         if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL) {
352                                 error = EADDRNOTAVAIL;
353                                 goto done;
354                         }
355                 }
356                 if (lport != 0) {
357                         struct inpcb *t;
358
359                         /* GROSS */
360                         if (ntohs(lport) < IPPORT_RESERVED &&
361                             cred &&
362                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0)) {
363                                 error = EACCES;
364                                 goto done;
365                         }
366                         if (so->so_cred->cr_uid != 0 &&
367                             !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
368                                 t = in_pcblookup_local(pcbinfo,
369                                                        sin->sin_addr,
370                                                        lport,
371                                                        INPLOOKUP_WILDCARD,
372                                                        cred);
373                                 if (t &&
374                                     (!in_nullhost(sin->sin_addr) ||
375                                      !in_nullhost(t->inp_laddr) ||
376                                      (t->inp_socket->so_options &
377                                          SO_REUSEPORT) == 0) &&
378                                     (so->so_cred->cr_uid !=
379                                      t->inp_socket->so_cred->cr_uid)) {
380 #ifdef INET6
381                                         if (!in_nullhost(sin->sin_addr) ||
382                                             !in_nullhost(t->inp_laddr) ||
383                                             INP_SOCKAF(so) ==
384                                             INP_SOCKAF(t->inp_socket))
385 #endif
386                                         {
387                                                 error = EADDRINUSE;
388                                                 goto done;
389                                         }
390                                 }
391                         }
392                         if (cred && !prison_replace_wildcards(td, nam)) {
393                                 error = EADDRNOTAVAIL;
394                                 goto done;
395                         }
396                         t = in_pcblookup_local(pcbinfo, sin->sin_addr, lport,
397                                                wild, cred);
398                         if (t && !(reuseport & t->inp_socket->so_options)) {
399 #ifdef INET6
400                                 if (!in_nullhost(sin->sin_addr) ||
401                                     !in_nullhost(t->inp_laddr) ||
402                                     INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
403 #endif
404                                 {
405                                         error = EADDRINUSE;
406                                         goto done;
407                                 }
408                         }
409                 }
410                 inp->inp_laddr = sin->sin_addr;
411         }
412         if (lport == 0) {
413                 ushort first, last;
414                 int count;
415
416                 jsin.sin_family = AF_INET;
417                 jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
418                 if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
419                         inp->inp_laddr.s_addr = INADDR_ANY;
420                         error = EINVAL;
421                         goto done;
422                 }
423                 inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
424
425                 inp->inp_flags |= INP_ANONPORT;
426
427                 if (inp->inp_flags & INP_HIGHPORT) {
428                         first = ipport_hifirstauto;     /* sysctl */
429                         last  = ipport_hilastauto;
430                         lastport = &pcbinfo->lasthi;
431                 } else if (inp->inp_flags & INP_LOWPORT) {
432                         if (cred &&
433                             (error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))) {
434                                 inp->inp_laddr.s_addr = INADDR_ANY;
435                                 goto done;
436                         }
437                         first = ipport_lowfirstauto;    /* 1023 */
438                         last  = ipport_lowlastauto;     /* 600 */
439                         lastport = &pcbinfo->lastlow;
440                 } else {
441                         first = ipport_firstauto;       /* sysctl */
442                         last  = ipport_lastauto;
443                         lastport = &pcbinfo->lastport;
444                 }
445                 /*
446                  * Simple check to ensure all ports are not used up causing
447                  * a deadlock here.
448                  *
449                  * We split the two cases (up and down) so that the direction
450                  * is not being tested on each round of the loop.
451                  */
452                 if (first > last) {
453                         /*
454                          * counting down
455                          */
456                         count = first - last;
457
458                         do {
459                                 if (count-- < 0) {      /* completely used? */
460                                         inp->inp_laddr.s_addr = INADDR_ANY;
461                                         error = EADDRNOTAVAIL;
462                                         goto done;
463                                 }
464                                 --*lastport;
465                                 if (*lastport > first || *lastport < last)
466                                         *lastport = first;
467                                 lport = htons(*lastport);
468                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
469                                                     lport, wild, cred));
470                 } else {
471                         /*
472                          * counting up
473                          */
474                         count = last - first;
475
476                         do {
477                                 if (count-- < 0) {      /* completely used? */
478                                         inp->inp_laddr.s_addr = INADDR_ANY;
479                                         error = EADDRNOTAVAIL;
480                                         goto done;
481                                 }
482                                 ++*lastport;
483                                 if (*lastport < first || *lastport > last)
484                                         *lastport = first;
485                                 lport = htons(*lastport);
486                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
487                                                     lport, wild, cred));
488                 }
489         }
490         inp->inp_lport = lport;
491
492         jsin.sin_family = AF_INET;
493         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
494         if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin)) {
495                 inp->inp_laddr.s_addr = INADDR_ANY;
496                 inp->inp_lport = 0;
497                 error = EINVAL;
498                 goto done;
499         }
500         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
501
502         if (in_pcbinsporthash(inp) != 0) {
503                 inp->inp_laddr.s_addr = INADDR_ANY;
504                 inp->inp_lport = 0;
505                 error = EAGAIN;
506                 goto done;
507         }
508         error = 0;
509 done:
510         if (pcbinfo->porttoken)
511                 lwkt_reltoken(pcbinfo->porttoken);
512         return error;
513 }
514
515 static struct inpcb *
516 in_pcblookup_addrport(struct inpcbinfo *pcbinfo, struct in_addr laddr,
517     u_short lport, struct in_addr faddr, u_short fport, struct ucred *cred)
518 {
519         struct inpcb *inp;
520         struct inpcbporthead *porthash;
521         struct inpcbport *phd;
522         struct inpcb *match = NULL;
523
524         /*
525          * If the porthashbase is shared across several cpus we need
526          * to lock.
527          */
528         if (pcbinfo->porttoken)
529                 lwkt_gettoken(pcbinfo->porttoken);
530
531         /*
532          * Best fit PCB lookup.
533          *
534          * First see if this local port is in use by looking on the
535          * port hash list.
536          */
537         porthash = &pcbinfo->porthashbase[
538                         INP_PCBPORTHASH(lport, pcbinfo->porthashmask)];
539         LIST_FOREACH(phd, porthash, phd_hash) {
540                 if (phd->phd_port == lport)
541                         break;
542         }
543         if (phd != NULL) {
544                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
545 #ifdef INET6
546                         if ((inp->inp_vflag & INP_IPV4) == 0)
547                                 continue;
548 #endif
549                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
550                             inp->inp_laddr.s_addr != laddr.s_addr)
551                                 continue;
552
553                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
554                             inp->inp_faddr.s_addr != faddr.s_addr)
555                                 continue;
556
557                         if (inp->inp_fport != 0 && inp->inp_fport != fport)
558                                 continue;
559
560                         if (cred == NULL ||
561                             cred->cr_prison ==
562                             inp->inp_socket->so_cred->cr_prison) {
563                                 match = inp;
564                                 break;
565                         }
566                 }
567         }
568         if (pcbinfo->porttoken)
569                 lwkt_reltoken(pcbinfo->porttoken);
570         return (match);
571 }
572
573 int
574 in_pcbconn_bind(struct inpcb *inp, const struct sockaddr *nam,
575     struct thread *td)
576 {
577         struct proc *p = td->td_proc;
578         unsigned short *lastport;
579         const struct sockaddr_in *sin = (const struct sockaddr_in *)nam;
580         struct sockaddr_in jsin;
581         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
582         struct ucred *cred = NULL;
583         u_short lport = 0;
584         ushort first, last;
585         int count, error, dup = 0;
586
587         if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) /* XXX broken! */
588                 return (EADDRNOTAVAIL);
589
590         KKASSERT(inp->inp_laddr.s_addr != INADDR_ANY);
591         if (inp->inp_lport != 0)
592                 return (EINVAL);        /* already bound */
593
594         KKASSERT(p);
595         cred = p->p_ucred;
596
597         /*
598          * This has to be atomic.  If the porthash is shared across multiple
599          * protocol threads (aka tcp) then the token will be non-NULL.
600          */
601         if (pcbinfo->porttoken)
602                 lwkt_gettoken(pcbinfo->porttoken);
603
604         jsin.sin_family = AF_INET;
605         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
606         if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
607                 inp->inp_laddr.s_addr = INADDR_ANY;
608                 error = EINVAL;
609                 goto done;
610         }
611         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
612
613         inp->inp_flags |= INP_ANONPORT;
614
615         if (inp->inp_flags & INP_HIGHPORT) {
616                 first = ipport_hifirstauto;     /* sysctl */
617                 last  = ipport_hilastauto;
618                 lastport = &pcbinfo->lasthi;
619         } else if (inp->inp_flags & INP_LOWPORT) {
620                 if (cred &&
621                     (error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))) {
622                         inp->inp_laddr.s_addr = INADDR_ANY;
623                         goto done;
624                 }
625                 first = ipport_lowfirstauto;    /* 1023 */
626                 last  = ipport_lowlastauto;     /* 600 */
627                 lastport = &pcbinfo->lastlow;
628         } else {
629                 first = ipport_firstauto;       /* sysctl */
630                 last  = ipport_lastauto;
631                 lastport = &pcbinfo->lastport;
632         }
633
634 again:
635         /*
636          * Simple check to ensure all ports are not used up causing
637          * a deadlock here.
638          *
639          * We split the two cases (up and down) so that the direction
640          * is not being tested on each round of the loop.
641          */
642         if (first > last) {
643                 /*
644                  * counting down
645                  */
646                 count = first - last;
647
648                 do {
649                         if (count-- < 0) {      /* completely used? */
650                                 inp->inp_laddr.s_addr = INADDR_ANY;
651                                 error = EADDRNOTAVAIL;
652                                 goto done;
653                         }
654                         --*lastport;
655                         if (*lastport > first || *lastport < last)
656                                 *lastport = first;
657                         lport = htons(*lastport);
658                 } while (in_pcblookup_addrport(pcbinfo, inp->inp_laddr, lport,
659                                 sin->sin_addr, sin->sin_port, cred));
660         } else {
661                 /*
662                  * counting up
663                  */
664                 count = last - first;
665
666                 do {
667                         if (count-- < 0) {      /* completely used? */
668                                 inp->inp_laddr.s_addr = INADDR_ANY;
669                                 error = EADDRNOTAVAIL;
670                                 goto done;
671                         }
672                         ++*lastport;
673                         if (*lastport < first || *lastport > last)
674                                 *lastport = first;
675                         lport = htons(*lastport);
676                 } while (in_pcblookup_addrport(pcbinfo, inp->inp_laddr, lport,
677                                 sin->sin_addr, sin->sin_port, cred));
678         }
679
680         /* This could happen on loopback interface */
681         if (sin->sin_port == lport &&
682             sin->sin_addr.s_addr == inp->inp_laddr.s_addr) {
683                 if (dup) {
684                         /*
685                          * Duplicate again; give up
686                          */
687                         inp->inp_laddr.s_addr = INADDR_ANY;
688                         error = EADDRNOTAVAIL;
689                         goto done;
690                 }
691                 dup = 1;
692                 goto again;
693         }
694         inp->inp_lport = lport;
695
696         jsin.sin_family = AF_INET;
697         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
698         if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin)) {
699                 inp->inp_laddr.s_addr = INADDR_ANY;
700                 inp->inp_lport = 0;
701                 error = EINVAL;
702                 goto done;
703         }
704         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
705
706         if (in_pcbinsporthash(inp) != 0) {
707                 inp->inp_laddr.s_addr = INADDR_ANY;
708                 inp->inp_lport = 0;
709                 error = EAGAIN;
710                 goto done;
711         }
712         error = 0;
713 done:
714         if (pcbinfo->porttoken)
715                 lwkt_reltoken(pcbinfo->porttoken);
716         return error;
717 }
718
719 /*
720  *   Transform old in_pcbconnect() into an inner subroutine for new
721  *   in_pcbconnect(): Do some validity-checking on the remote
722  *   address (in mbuf 'nam') and then determine local host address
723  *   (i.e., which interface) to use to access that remote host.
724  *
725  *   This preserves definition of in_pcbconnect(), while supporting a
726  *   slightly different version for T/TCP.  (This is more than
727  *   a bit of a kludge, but cleaning up the internal interfaces would
728  *   have forced minor changes in every protocol).
729  */
730 int
731 in_pcbladdr_find(struct inpcb *inp, struct sockaddr *nam,
732     struct sockaddr_in **plocal_sin, struct thread *td, int find)
733 {
734         struct in_ifaddr *ia;
735         struct ucred *cred = NULL;
736         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
737         struct sockaddr *jsin;
738         int jailed = 0, alloc_route = 0;
739
740         if (nam->sa_len != sizeof *sin)
741                 return (EINVAL);
742         if (sin->sin_family != AF_INET)
743                 return (EAFNOSUPPORT);
744         if (sin->sin_port == 0)
745                 return (EADDRNOTAVAIL);
746         if (td && td->td_proc && td->td_proc->p_ucred)
747                 cred = td->td_proc->p_ucred;
748         if (cred && cred->cr_prison)
749                 jailed = 1;
750         if (!TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) {
751                 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
752                 /*
753                  * If the destination address is INADDR_ANY,
754                  * use the primary local address.
755                  * If the supplied address is INADDR_BROADCAST,
756                  * and the primary interface supports broadcast,
757                  * choose the broadcast address for that interface.
758                  */
759                 if (sin->sin_addr.s_addr == INADDR_ANY)
760                         sin->sin_addr = IA_SIN(ia)->sin_addr;
761                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
762                     (ia->ia_ifp->if_flags & IFF_BROADCAST))
763                         sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
764         }
765         if (find) {
766                 struct route *ro;
767
768                 ia = NULL;
769                 /*
770                  * If route is known or can be allocated now,
771                  * our src addr is taken from the i/f, else punt.
772                  * Note that we should check the address family of the cached
773                  * destination, in case of sharing the cache with IPv6.
774                  */
775                 ro = &inp->inp_route;
776                 if (ro->ro_rt &&
777                     (!(ro->ro_rt->rt_flags & RTF_UP) ||
778                      ro->ro_dst.sa_family != AF_INET ||
779                      satosin(&ro->ro_dst)->sin_addr.s_addr !=
780                                       sin->sin_addr.s_addr ||
781                      inp->inp_socket->so_options & SO_DONTROUTE)) {
782                         RTFREE(ro->ro_rt);
783                         ro->ro_rt = NULL;
784                 }
785                 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
786                     (ro->ro_rt == NULL ||
787                     ro->ro_rt->rt_ifp == NULL)) {
788                         /* No route yet, so try to acquire one */
789                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
790                         ro->ro_dst.sa_family = AF_INET;
791                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
792                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
793                                 sin->sin_addr;
794                         rtalloc(ro);
795                         alloc_route = 1;
796                 }
797                 /*
798                  * If we found a route, use the address
799                  * corresponding to the outgoing interface
800                  * unless it is the loopback (in case a route
801                  * to our address on another net goes to loopback).
802                  */
803                 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) {
804                         if (jailed) {
805                                 if (jailed_ip(cred->cr_prison, 
806                                     ro->ro_rt->rt_ifa->ifa_addr)) {
807                                         ia = ifatoia(ro->ro_rt->rt_ifa);
808                                 }
809                         } else {
810                                 ia = ifatoia(ro->ro_rt->rt_ifa);
811                         }
812                 }
813                 if (ia == NULL) {
814                         u_short fport = sin->sin_port;
815
816                         sin->sin_port = 0;
817                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
818                         if (ia && jailed && !jailed_ip(cred->cr_prison,
819                             sintosa(&ia->ia_addr)))
820                                 ia = NULL;
821                         if (ia == NULL)
822                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
823                         if (ia && jailed && !jailed_ip(cred->cr_prison,
824                             sintosa(&ia->ia_addr)))
825                                 ia = NULL;
826                         sin->sin_port = fport;
827                         if (ia == NULL &&
828                             !TAILQ_EMPTY(&in_ifaddrheads[mycpuid]))
829                                 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
830                         if (ia && jailed && !jailed_ip(cred->cr_prison,
831                             sintosa(&ia->ia_addr)))
832                                 ia = NULL;
833
834                         if (!jailed && ia == NULL)
835                                 goto fail;
836                 }
837                 /*
838                  * If the destination address is multicast and an outgoing
839                  * interface has been set as a multicast option, use the
840                  * address of that interface as our source address.
841                  */
842                 if (!jailed && IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
843                     inp->inp_moptions != NULL) {
844                         struct ip_moptions *imo;
845                         struct ifnet *ifp;
846
847                         imo = inp->inp_moptions;
848                         if (imo->imo_multicast_ifp != NULL) {
849                                 struct in_ifaddr_container *iac;
850
851                                 ifp = imo->imo_multicast_ifp;
852                                 ia = NULL;
853                                 TAILQ_FOREACH(iac,
854                                 &in_ifaddrheads[mycpuid], ia_link) {
855                                         if (iac->ia->ia_ifp == ifp) {
856                                                 ia = iac->ia;
857                                                 break;
858                                         }
859                                 }
860                                 if (ia == NULL)
861                                         goto fail;
862                         }
863                 }
864                 /*
865                  * Don't do pcblookup call here; return interface in plocal_sin
866                  * and exit to caller, that will do the lookup.
867                  */
868                 if (ia == NULL && jailed) {
869                         if ((jsin = prison_get_nonlocal(cred->cr_prison, AF_INET, NULL)) != NULL ||
870                             (jsin = prison_get_local(cred->cr_prison, AF_INET, NULL)) != NULL) {
871                                 *plocal_sin = satosin(jsin);
872                         } else {
873                                 /* IPv6 only Jail */
874                                 goto fail;
875                         }
876                 } else {
877                         *plocal_sin = &ia->ia_addr;
878                 }
879         }
880         return (0);
881 fail:
882         if (alloc_route) {
883                 struct route *ro = &inp->inp_route;
884
885                 if (ro->ro_rt != NULL)
886                         RTFREE(ro->ro_rt);
887                 bzero(ro, sizeof(*ro));
888         }
889         return (EADDRNOTAVAIL);
890 }
891
892 int
893 in_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
894     struct sockaddr_in **plocal_sin, struct thread *td)
895 {
896         return in_pcbladdr_find(inp, nam, plocal_sin, td,
897             (inp->inp_laddr.s_addr == INADDR_ANY));
898 }
899
900 /*
901  * Outer subroutine:
902  * Connect from a socket to a specified address.
903  * Both address and port must be specified in argument sin.
904  * If don't have a local address for this socket yet,
905  * then pick one.
906  */
907 int
908 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
909 {
910         struct sockaddr_in *if_sin;
911         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
912         int error;
913
914         /* Call inner routine to assign local interface address. */
915         if ((error = in_pcbladdr(inp, nam, &if_sin, td)) != 0)
916                 return (error);
917
918         if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port,
919                               inp->inp_laddr.s_addr ?
920                                 inp->inp_laddr : if_sin->sin_addr,
921                               inp->inp_lport, FALSE, NULL) != NULL) {
922                 return (EADDRINUSE);
923         }
924         if (inp->inp_laddr.s_addr == INADDR_ANY) {
925                 if (inp->inp_lport == 0) {
926                         error = in_pcbbind(inp, NULL, td);
927                         if (error)
928                                 return (error);
929                 }
930                 inp->inp_laddr = if_sin->sin_addr;
931         }
932         inp->inp_faddr = sin->sin_addr;
933         inp->inp_fport = sin->sin_port;
934         in_pcbinsconnhash(inp);
935         return (0);
936 }
937
938 void
939 in_pcbdisconnect(struct inpcb *inp)
940 {
941
942         inp->inp_faddr.s_addr = INADDR_ANY;
943         inp->inp_fport = 0;
944         in_pcbremconnhash(inp);
945         if (inp->inp_socket->so_state & SS_NOFDREF)
946                 in_pcbdetach(inp);
947 }
948
949 void
950 in_pcbdetach(struct inpcb *inp)
951 {
952         struct socket *so = inp->inp_socket;
953         struct inpcbinfo *ipi = inp->inp_pcbinfo;
954
955 #ifdef IPSEC
956         ipsec4_delete_pcbpolicy(inp);
957 #endif /*IPSEC*/
958         inp->inp_gencnt = ++ipi->ipi_gencnt;
959         KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
960         in_pcbremlists(inp);
961         so->so_pcb = NULL;
962         sofree(so);                     /* remove pcb ref */
963         if (inp->inp_options)
964                 m_free(inp->inp_options);
965         if (inp->inp_route.ro_rt)
966                 rtfree(inp->inp_route.ro_rt);
967         ip_freemoptions(inp->inp_moptions);
968         inp->inp_vflag = 0;
969         kfree(inp, M_PCB);
970 }
971
972 /*
973  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
974  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
975  * in struct pr_usrreqs, so that protocols can just reference then directly
976  * without the need for a wrapper function.  The socket must have a valid
977  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
978  * except through a kernel programming error, so it is acceptable to panic
979  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
980  * because there actually /is/ a programming error somewhere... XXX)
981  */
982 int
983 in_setsockaddr(struct socket *so, struct sockaddr **nam)
984 {
985         struct inpcb *inp;
986         struct sockaddr_in *sin;
987
988         /*
989          * Do the malloc first in case it blocks.
990          */
991         sin = kmalloc(sizeof *sin, M_SONAME, M_WAITOK | M_ZERO);
992         sin->sin_family = AF_INET;
993         sin->sin_len = sizeof *sin;
994
995         crit_enter();
996         inp = so->so_pcb;
997         if (!inp) {
998                 crit_exit();
999                 kfree(sin, M_SONAME);
1000                 return (ECONNRESET);
1001         }
1002         sin->sin_port = inp->inp_lport;
1003         sin->sin_addr = inp->inp_laddr;
1004         crit_exit();
1005
1006         *nam = (struct sockaddr *)sin;
1007         return (0);
1008 }
1009
1010 void
1011 in_setsockaddr_dispatch(netmsg_t msg)
1012 {
1013         int error;
1014
1015         error = in_setsockaddr(msg->base.nm_so, msg->peeraddr.nm_nam);
1016         lwkt_replymsg(&msg->lmsg, error);
1017 }
1018
1019 int
1020 in_setpeeraddr(struct socket *so, struct sockaddr **nam)
1021 {
1022         struct inpcb *inp;
1023         struct sockaddr_in *sin;
1024
1025         /*
1026          * Do the malloc first in case it blocks.
1027          */
1028         sin = kmalloc(sizeof *sin, M_SONAME, M_WAITOK | M_ZERO);
1029         sin->sin_family = AF_INET;
1030         sin->sin_len = sizeof *sin;
1031
1032         crit_enter();
1033         inp = so->so_pcb;
1034         if (!inp) {
1035                 crit_exit();
1036                 kfree(sin, M_SONAME);
1037                 return (ECONNRESET);
1038         }
1039         sin->sin_port = inp->inp_fport;
1040         sin->sin_addr = inp->inp_faddr;
1041         crit_exit();
1042
1043         *nam = (struct sockaddr *)sin;
1044         return (0);
1045 }
1046
1047 void
1048 in_setpeeraddr_dispatch(netmsg_t msg)
1049 {
1050         int error;
1051
1052         error = in_setpeeraddr(msg->base.nm_so, msg->peeraddr.nm_nam);
1053         lwkt_replymsg(&msg->lmsg, error);
1054 }
1055
1056 void
1057 in_pcbnotifyall(struct inpcbhead *head, struct in_addr faddr, int err,
1058                 void (*notify)(struct inpcb *, int))
1059 {
1060         struct inpcb *inp, *ninp;
1061
1062         /*
1063          * note: if INP_PLACEMARKER is set we must ignore the rest of
1064          * the structure and skip it.
1065          */
1066         crit_enter();
1067         LIST_FOREACH_MUTABLE(inp, head, inp_list, ninp) {
1068                 if (inp->inp_flags & INP_PLACEMARKER)
1069                         continue;
1070 #ifdef INET6
1071                 if (!(inp->inp_vflag & INP_IPV4))
1072                         continue;
1073 #endif
1074                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1075                     inp->inp_socket == NULL)
1076                         continue;
1077                 (*notify)(inp, err);            /* can remove inp from list! */
1078         }
1079         crit_exit();
1080 }
1081
1082 void
1083 in_pcbpurgeif0(struct inpcb *head, struct ifnet *ifp)
1084 {
1085         struct inpcb *inp;
1086         struct ip_moptions *imo;
1087         int i, gap;
1088
1089         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
1090                 if (inp->inp_flags & INP_PLACEMARKER)
1091                         continue;
1092                 imo = inp->inp_moptions;
1093                 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) {
1094                         /*
1095                          * Unselect the outgoing interface if it is being
1096                          * detached.
1097                          */
1098                         if (imo->imo_multicast_ifp == ifp)
1099                                 imo->imo_multicast_ifp = NULL;
1100
1101                         /*
1102                          * Drop multicast group membership if we joined
1103                          * through the interface being detached.
1104                          */
1105                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1106                             i++) {
1107                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1108                                         in_delmulti(imo->imo_membership[i]);
1109                                         gap++;
1110                                 } else if (gap != 0)
1111                                         imo->imo_membership[i - gap] =
1112                                             imo->imo_membership[i];
1113                         }
1114                         imo->imo_num_memberships -= gap;
1115                 }
1116         }
1117 }
1118
1119 /*
1120  * Check for alternatives when higher level complains
1121  * about service problems.  For now, invalidate cached
1122  * routing information.  If the route was created dynamically
1123  * (by a redirect), time to try a default gateway again.
1124  */
1125 void
1126 in_losing(struct inpcb *inp)
1127 {
1128         struct rtentry *rt;
1129         struct rt_addrinfo rtinfo;
1130
1131         if ((rt = inp->inp_route.ro_rt)) {
1132                 bzero(&rtinfo, sizeof(struct rt_addrinfo));
1133                 rtinfo.rti_info[RTAX_DST] = rt_key(rt);
1134                 rtinfo.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1135                 rtinfo.rti_info[RTAX_NETMASK] = rt_mask(rt);
1136                 rtinfo.rti_flags = rt->rt_flags;
1137                 rt_missmsg(RTM_LOSING, &rtinfo, rt->rt_flags, 0);
1138                 if (rt->rt_flags & RTF_DYNAMIC) {
1139                         rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1140                             rt_mask(rt), rt->rt_flags, NULL);
1141                 }
1142                 inp->inp_route.ro_rt = NULL;
1143                 rtfree(rt);
1144                 /*
1145                  * A new route can be allocated
1146                  * the next time output is attempted.
1147                  */
1148         }
1149 }
1150
1151 /*
1152  * After a routing change, flush old routing
1153  * and allocate a (hopefully) better one.
1154  */
1155 void
1156 in_rtchange(struct inpcb *inp, int err)
1157 {
1158         if (inp->inp_route.ro_rt) {
1159                 rtfree(inp->inp_route.ro_rt);
1160                 inp->inp_route.ro_rt = NULL;
1161                 /*
1162                  * A new route can be allocated the next time
1163                  * output is attempted.
1164                  */
1165         }
1166 }
1167
1168 /*
1169  * Lookup a PCB based on the local address and port.
1170  */
1171 struct inpcb *
1172 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
1173                    u_int lport_arg, int wild_okay, struct ucred *cred)
1174 {
1175         struct inpcb *inp;
1176         int matchwild = 3, wildcard;
1177         u_short lport = lport_arg;
1178         struct inpcbporthead *porthash;
1179         struct inpcbport *phd;
1180         struct inpcb *match = NULL;
1181
1182         /*
1183          * If the porthashbase is shared across several cpus we need
1184          * to lock.
1185          */
1186         if (pcbinfo->porttoken)
1187                 lwkt_gettoken(pcbinfo->porttoken);
1188
1189         /*
1190          * Best fit PCB lookup.
1191          *
1192          * First see if this local port is in use by looking on the
1193          * port hash list.
1194          */
1195         porthash = &pcbinfo->porthashbase[
1196                         INP_PCBPORTHASH(lport, pcbinfo->porthashmask)];
1197         LIST_FOREACH(phd, porthash, phd_hash) {
1198                 if (phd->phd_port == lport)
1199                         break;
1200         }
1201         if (phd != NULL) {
1202                 /*
1203                  * Port is in use by one or more PCBs. Look for best
1204                  * fit.
1205                  */
1206                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1207                         wildcard = 0;
1208 #ifdef INET6
1209                         if ((inp->inp_vflag & INP_IPV4) == 0)
1210                                 continue;
1211 #endif
1212                         if (inp->inp_faddr.s_addr != INADDR_ANY)
1213                                 wildcard++;
1214                         if (inp->inp_laddr.s_addr != INADDR_ANY) {
1215                                 if (laddr.s_addr == INADDR_ANY)
1216                                         wildcard++;
1217                                 else if (inp->inp_laddr.s_addr != laddr.s_addr)
1218                                         continue;
1219                         } else {
1220                                 if (laddr.s_addr != INADDR_ANY)
1221                                         wildcard++;
1222                         }
1223                         if (wildcard && !wild_okay)
1224                                 continue;
1225                         if (wildcard < matchwild &&
1226                             (cred == NULL ||
1227                              cred->cr_prison == 
1228                                         inp->inp_socket->so_cred->cr_prison)) {
1229                                 match = inp;
1230                                 matchwild = wildcard;
1231                                 if (matchwild == 0) {
1232                                         break;
1233                                 }
1234                         }
1235                 }
1236         }
1237         if (pcbinfo->porttoken)
1238                 lwkt_reltoken(pcbinfo->porttoken);
1239         return (match);
1240 }
1241
1242 struct inpcb *
1243 in_pcblocalgroup_last(const struct inpcbinfo *pcbinfo,
1244     const struct inpcb *inp)
1245 {
1246         const struct inp_localgrphead *hdr;
1247         const struct inp_localgroup *grp;
1248         int i;
1249
1250         if (pcbinfo->localgrphashbase == NULL)
1251                 return NULL;
1252
1253         hdr = &pcbinfo->localgrphashbase[
1254             INP_PCBLOCALGRPHASH(inp->inp_lport, pcbinfo->localgrphashmask)];
1255
1256         LIST_FOREACH(grp, hdr, il_list) {
1257                 if (grp->il_vflag == inp->inp_vflag &&
1258                     grp->il_lport == inp->inp_lport &&
1259                     memcmp(&grp->il_dependladdr,
1260                         &inp->inp_inc.inc_ie.ie_dependladdr,
1261                         sizeof(grp->il_dependladdr)) == 0) {
1262                         break;
1263                 }
1264         }
1265         if (grp == NULL || grp->il_inpcnt == 1)
1266                 return NULL;
1267
1268         KASSERT(grp->il_inpcnt >= 2,
1269             ("invalid localgroup inp count %d", grp->il_inpcnt));
1270         for (i = 0; i < grp->il_inpcnt; ++i) {
1271                 if (grp->il_inp[i] == inp) {
1272                         int last = grp->il_inpcnt - 1;
1273
1274                         if (i == last)
1275                                 last = grp->il_inpcnt - 2;
1276                         return grp->il_inp[last];
1277                 }
1278         }
1279         return NULL;
1280 }
1281
1282 static struct inpcb *
1283 inp_localgroup_lookup(const struct inpcbinfo *pcbinfo,
1284     struct in_addr laddr, uint16_t lport, uint32_t pkt_hash)
1285 {
1286         struct inpcb *local_wild = NULL;
1287         const struct inp_localgrphead *hdr;
1288         const struct inp_localgroup *grp;
1289
1290         hdr = &pcbinfo->localgrphashbase[
1291             INP_PCBLOCALGRPHASH(lport, pcbinfo->localgrphashmask)];
1292 #ifdef INP_LOCALGROUP_HASHTHR
1293         pkt_hash >>= ncpus2_shift;
1294 #endif
1295
1296         /*
1297          * Order of socket selection:
1298          * 1. non-wild.
1299          * 2. wild.
1300          *
1301          * NOTE:
1302          * - Local group does not contain jailed sockets
1303          * - Local group does not contain IPv4 mapped INET6 wild sockets
1304          */
1305         LIST_FOREACH(grp, hdr, il_list) {
1306 #ifdef INET6
1307                 if (!(grp->il_vflag & INP_IPV4))
1308                         continue;
1309 #endif
1310                 if (grp->il_lport == lport) {
1311                         int idx;
1312
1313 #ifdef INP_LOCALGROUP_HASHTHR
1314                         idx = pkt_hash / grp->il_factor;
1315                         KASSERT(idx < grp->il_inpcnt && idx >= 0,
1316                             ("invalid hash %04x, cnt %d or fact %d",
1317                              pkt_hash, grp->il_inpcnt, grp->il_factor));
1318 #else
1319                         /*
1320                          * Modulo-N is used here, which greatly reduces
1321                          * completion queue token contention, thus more
1322                          * cpu time is saved.
1323                          */
1324                         idx = pkt_hash % grp->il_inpcnt;
1325 #endif
1326
1327                         if (grp->il_laddr.s_addr == laddr.s_addr)
1328                                 return grp->il_inp[idx];
1329                         else if (grp->il_laddr.s_addr == INADDR_ANY)
1330                                 local_wild = grp->il_inp[idx];
1331                 }
1332         }
1333         if (local_wild != NULL)
1334                 return local_wild;
1335         return NULL;
1336 }
1337
1338 /*
1339  * Lookup PCB in hash list.
1340  */
1341 struct inpcb *
1342 in_pcblookup_pkthash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1343     u_int fport_arg, struct in_addr laddr, u_int lport_arg,
1344     boolean_t wildcard, struct ifnet *ifp, const struct mbuf *m)
1345 {
1346         struct inpcbhead *head;
1347         struct inpcb *inp, *jinp=NULL;
1348         u_short fport = fport_arg, lport = lport_arg;
1349
1350         /*
1351          * First look for an exact match.
1352          */
1353         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport,
1354             laddr.s_addr, lport, pcbinfo->hashmask)];
1355         LIST_FOREACH(inp, head, inp_hash) {
1356 #ifdef INET6
1357                 if (!(inp->inp_vflag & INP_IPV4))
1358                         continue;
1359 #endif
1360                 if (in_hosteq(inp->inp_faddr, faddr) &&
1361                     in_hosteq(inp->inp_laddr, laddr) &&
1362                     inp->inp_fport == fport && inp->inp_lport == lport) {
1363                         /* found */
1364                         if (inp->inp_socket == NULL ||
1365                             inp->inp_socket->so_cred->cr_prison == NULL) {
1366                                 return (inp);
1367                         } else {
1368                                 if  (jinp == NULL)
1369                                         jinp = inp;
1370                         }
1371                 }
1372         }
1373         if (jinp != NULL)
1374                 return (jinp);
1375         if (wildcard) {
1376                 struct inpcb *local_wild = NULL;
1377                 struct inpcb *jinp_wild = NULL;
1378 #ifdef INET6
1379                 struct inpcb *local_wild_mapped = NULL;
1380 #endif
1381                 struct inpcontainer *ic;
1382                 struct inpcontainerhead *chead;
1383                 struct sockaddr_in jsin;
1384                 struct ucred *cred;
1385
1386                 /*
1387                  * Check local group first
1388                  */
1389                 if (pcbinfo->localgrphashbase != NULL &&
1390                     m != NULL && (m->m_flags & M_HASH) &&
1391                     !(ifp && ifp->if_type == IFT_FAITH)) {
1392                         inp = inp_localgroup_lookup(pcbinfo,
1393                             laddr, lport, m->m_pkthdr.hash);
1394                         if (inp != NULL)
1395                                 return inp;
1396                 }
1397
1398                 /*
1399                  * Order of socket selection:
1400                  * 1. non-jailed, non-wild.
1401                  * 2. non-jailed, wild.
1402                  * 3. jailed, non-wild.
1403                  * 4. jailed, wild.
1404                  */
1405                 jsin.sin_family = AF_INET;
1406                 chead = &pcbinfo->wildcardhashbase[
1407                     INP_PCBWILDCARDHASH(lport, pcbinfo->wildcardhashmask)];
1408                 LIST_FOREACH(ic, chead, ic_list) {
1409                         inp = ic->ic_inp;
1410                         jsin.sin_addr.s_addr = laddr.s_addr;
1411 #ifdef INET6
1412                         if (!(inp->inp_vflag & INP_IPV4))
1413                                 continue;
1414 #endif
1415                         if (inp->inp_socket != NULL)
1416                                 cred = inp->inp_socket->so_cred;
1417                         else
1418                                 cred = NULL;
1419                         if (cred != NULL && jailed(cred)) {
1420                                 if (jinp != NULL)
1421                                         continue;
1422                                 else
1423                                         if (!jailed_ip(cred->cr_prison,
1424                                             (struct sockaddr *)&jsin))
1425                                                 continue;
1426                         }
1427                         if (inp->inp_lport == lport) {
1428                                 if (ifp && ifp->if_type == IFT_FAITH &&
1429                                     !(inp->inp_flags & INP_FAITH))
1430                                         continue;
1431                                 if (inp->inp_laddr.s_addr == laddr.s_addr) {
1432                                         if (cred != NULL && jailed(cred))
1433                                                 jinp = inp;
1434                                         else
1435                                                 return (inp);
1436                                 }
1437                                 if (inp->inp_laddr.s_addr == INADDR_ANY) {
1438 #ifdef INET6
1439                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
1440                                                              AF_INET6))
1441                                                 local_wild_mapped = inp;
1442                                         else
1443 #endif
1444                                                 if (cred != NULL &&
1445                                                     jailed(cred))
1446                                                         jinp_wild = inp;
1447                                                 else
1448                                                         local_wild = inp;
1449                                 }
1450                         }
1451                 }
1452                 if (local_wild != NULL)
1453                         return (local_wild);
1454 #ifdef INET6
1455                 if (local_wild_mapped != NULL)
1456                         return (local_wild_mapped);
1457 #endif
1458                 if (jinp != NULL)
1459                         return (jinp);
1460                 return (jinp_wild);
1461         }
1462
1463         /*
1464          * Not found.
1465          */
1466         return (NULL);
1467 }
1468
1469 struct inpcb *
1470 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1471     u_int fport_arg, struct in_addr laddr, u_int lport_arg,
1472     boolean_t wildcard, struct ifnet *ifp)
1473 {
1474         return in_pcblookup_pkthash(pcbinfo, faddr, fport_arg,
1475             laddr, lport_arg, wildcard, ifp, NULL);
1476 }
1477
1478 /*
1479  * Insert PCB into connection hash table.
1480  */
1481 void
1482 in_pcbinsconnhash(struct inpcb *inp)
1483 {
1484         struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo;
1485         struct inpcbhead *bucket;
1486         u_int32_t hashkey_faddr, hashkey_laddr;
1487
1488 #ifdef INET6
1489         if (inp->inp_vflag & INP_IPV6) {
1490                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */;
1491                 hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */;
1492         } else {
1493 #endif
1494                 hashkey_faddr = inp->inp_faddr.s_addr;
1495                 hashkey_laddr = inp->inp_laddr.s_addr;
1496 #ifdef INET6
1497         }
1498 #endif
1499
1500         KASSERT(!(inp->inp_flags & INP_WILDCARD),
1501                 ("already on wildcardhash"));
1502         KASSERT(!(inp->inp_flags & INP_CONNECTED),
1503                 ("already on connhash"));
1504         inp->inp_flags |= INP_CONNECTED;
1505
1506         /*
1507          * Insert into the connection hash table.
1508          */
1509         bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr,
1510             inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)];
1511         LIST_INSERT_HEAD(bucket, inp, inp_hash);
1512 }
1513
1514 /*
1515  * Remove PCB from connection hash table.
1516  */
1517 void
1518 in_pcbremconnhash(struct inpcb *inp)
1519 {
1520         KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected"));
1521         LIST_REMOVE(inp, inp_hash);
1522         inp->inp_flags &= ~INP_CONNECTED;
1523 }
1524
1525 /*
1526  * Insert PCB into port hash table.
1527  */
1528 int
1529 in_pcbinsporthash(struct inpcb *inp)
1530 {
1531         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1532         struct inpcbporthead *pcbporthash;
1533         struct inpcbport *phd;
1534
1535         /*
1536          * If the porthashbase is shared across several cpus we need
1537          * to lock.
1538          */
1539         if (pcbinfo->porttoken)
1540                 lwkt_gettoken(pcbinfo->porttoken);
1541
1542         /*
1543          * Insert into the port hash table.
1544          */
1545         pcbporthash = &pcbinfo->porthashbase[
1546             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->porthashmask)];
1547
1548         /* Go through port list and look for a head for this lport. */
1549         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1550                 if (phd->phd_port == inp->inp_lport)
1551                         break;
1552         }
1553
1554         /* If none exists, malloc one and tack it on. */
1555         if (phd == NULL) {
1556                 KKASSERT(pcbinfo->portsave != NULL);
1557                 phd = pcbinfo->portsave;
1558                 pcbinfo->portsave = NULL;
1559                 phd->phd_port = inp->inp_lport;
1560                 LIST_INIT(&phd->phd_pcblist);
1561                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1562         }
1563
1564         inp->inp_phd = phd;
1565         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1566
1567         if (pcbinfo->porttoken)
1568                 lwkt_reltoken(pcbinfo->porttoken);
1569         if (pcbinfo->portsave == NULL) {
1570                 pcbinfo->portsave = kmalloc(sizeof(*pcbinfo->portsave),
1571                                             M_PCB, M_INTWAIT | M_ZERO);
1572         }
1573         return (0);
1574 }
1575
1576 static struct inp_localgroup *
1577 inp_localgroup_alloc(struct inp_localgrphead *hdr, u_char vflag,
1578     uint16_t port, const union in_dependaddr *addr, int size)
1579 {
1580         struct inp_localgroup *grp;
1581
1582         grp = kmalloc(__offsetof(struct inp_localgroup, il_inp[size]),
1583             M_TEMP, M_INTWAIT | M_ZERO);
1584         grp->il_vflag = vflag;
1585         grp->il_lport = port;
1586         grp->il_dependladdr = *addr;
1587         grp->il_inpsiz = size;
1588
1589         LIST_INSERT_HEAD(hdr, grp, il_list);
1590
1591         return grp;
1592 }
1593
1594 static void
1595 inp_localgroup_free(struct inp_localgroup *grp)
1596 {
1597         LIST_REMOVE(grp, il_list);
1598         kfree(grp, M_TEMP);
1599 }
1600
1601 static struct inp_localgroup *
1602 inp_localgroup_resize(struct inp_localgrphead *hdr,
1603     struct inp_localgroup *old_grp, int size)
1604 {
1605         struct inp_localgroup *grp;
1606         int i;
1607
1608         grp = inp_localgroup_alloc(hdr, old_grp->il_vflag,
1609             old_grp->il_lport, &old_grp->il_dependladdr, size);
1610
1611         KASSERT(old_grp->il_inpcnt < grp->il_inpsiz,
1612             ("invalid new local group size %d and old local group count %d",
1613              grp->il_inpsiz, old_grp->il_inpcnt));
1614         for (i = 0; i < old_grp->il_inpcnt; ++i)
1615                 grp->il_inp[i] = old_grp->il_inp[i];
1616         grp->il_inpcnt = old_grp->il_inpcnt;
1617         grp->il_factor = old_grp->il_factor;
1618
1619         inp_localgroup_free(old_grp);
1620
1621         return grp;
1622 }
1623
1624 static void
1625 inp_localgroup_factor(struct inp_localgroup *grp)
1626 {
1627         grp->il_factor =
1628             ((uint32_t)(0xffff >> ncpus2_shift) / grp->il_inpcnt) + 1;
1629         KASSERT(grp->il_factor != 0, ("invalid local group factor, "
1630             "ncpus2_shift %d, inpcnt %d", ncpus2_shift, grp->il_inpcnt));
1631 }
1632
1633 static void
1634 in_pcbinslocalgrphash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1635 {
1636         struct inp_localgrphead *hdr;
1637         struct inp_localgroup *grp;
1638         struct ucred *cred;
1639
1640         if (pcbinfo->localgrphashbase == NULL)
1641                 return;
1642
1643         /*
1644          * XXX don't allow jailed socket to join local group
1645          */
1646         if (inp->inp_socket != NULL)
1647                 cred = inp->inp_socket->so_cred;
1648         else
1649                 cred = NULL;
1650         if (cred != NULL && jailed(cred))
1651                 return;
1652
1653 #ifdef INET6
1654         /*
1655          * XXX don't allow IPv4 mapped INET6 wild socket
1656          */
1657         if ((inp->inp_vflag & INP_IPV4) &&
1658             inp->inp_laddr.s_addr == INADDR_ANY &&
1659             INP_CHECK_SOCKAF(inp->inp_socket, AF_INET6))
1660                 return;
1661 #endif
1662
1663         hdr = &pcbinfo->localgrphashbase[
1664             INP_PCBLOCALGRPHASH(inp->inp_lport, pcbinfo->localgrphashmask)];
1665
1666         LIST_FOREACH(grp, hdr, il_list) {
1667                 if (grp->il_vflag == inp->inp_vflag &&
1668                     grp->il_lport == inp->inp_lport &&
1669                     memcmp(&grp->il_dependladdr,
1670                         &inp->inp_inc.inc_ie.ie_dependladdr,
1671                         sizeof(grp->il_dependladdr)) == 0) {
1672                         break;
1673                 }
1674         }
1675         if (grp == NULL) {
1676                 /* Create new local group */
1677                 grp = inp_localgroup_alloc(hdr, inp->inp_vflag,
1678                     inp->inp_lport, &inp->inp_inc.inc_ie.ie_dependladdr,
1679                     INP_LOCALGROUP_SIZMIN);
1680         } else if (grp->il_inpcnt == grp->il_inpsiz) {
1681                 if (grp->il_inpsiz >= INP_LOCALGROUP_SIZMAX) {
1682                         static int limit_logged = 0;
1683
1684                         if (!limit_logged) {
1685                                 limit_logged = 1;
1686                                 kprintf("local group port %d, "
1687                                     "limit reached\n", ntohs(grp->il_lport));
1688                         }
1689                         return;
1690                 }
1691
1692                 /* Expand this local group */
1693                 grp = inp_localgroup_resize(hdr, grp, grp->il_inpsiz * 2);
1694         }
1695
1696         KASSERT(grp->il_inpcnt < grp->il_inpsiz,
1697             ("invalid local group size %d and count %d",
1698              grp->il_inpsiz, grp->il_inpcnt));
1699         grp->il_inp[grp->il_inpcnt] = inp;
1700         grp->il_inpcnt++;
1701         inp_localgroup_factor(grp);
1702 }
1703
1704 void
1705 in_pcbinswildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1706 {
1707         struct inpcontainer *ic;
1708         struct inpcontainerhead *bucket;
1709
1710         in_pcbinslocalgrphash_oncpu(inp, pcbinfo);
1711
1712         bucket = &pcbinfo->wildcardhashbase[
1713             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1714
1715         ic = kmalloc(sizeof(struct inpcontainer), M_TEMP, M_INTWAIT);
1716         ic->ic_inp = inp;
1717         LIST_INSERT_HEAD(bucket, ic, ic_list);
1718 }
1719
1720 /*
1721  * Insert PCB into wildcard hash table.
1722  */
1723 void
1724 in_pcbinswildcardhash(struct inpcb *inp)
1725 {
1726         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1727
1728         KASSERT(!(inp->inp_flags & INP_CONNECTED),
1729                 ("already on connhash"));
1730         KASSERT(!(inp->inp_flags & INP_WILDCARD),
1731                 ("already on wildcardhash"));
1732         inp->inp_flags |= INP_WILDCARD;
1733
1734         in_pcbinswildcardhash_oncpu(inp, pcbinfo);
1735 }
1736
1737 static void
1738 in_pcbremlocalgrphash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1739 {
1740         struct inp_localgrphead *hdr;
1741         struct inp_localgroup *grp;
1742
1743         if (pcbinfo->localgrphashbase == NULL)
1744                 return;
1745
1746         hdr = &pcbinfo->localgrphashbase[
1747             INP_PCBLOCALGRPHASH(inp->inp_lport, pcbinfo->localgrphashmask)];
1748
1749         LIST_FOREACH(grp, hdr, il_list) {
1750                 int i;
1751
1752                 for (i = 0; i < grp->il_inpcnt; ++i) {
1753                         if (grp->il_inp[i] != inp)
1754                                 continue;
1755
1756                         if (grp->il_inpcnt == 1) {
1757                                 /* Free this local group */
1758                                 inp_localgroup_free(grp);
1759                         } else {
1760                                 /* Pull up inpcbs */
1761                                 for (; i + 1 < grp->il_inpcnt; ++i)
1762                                         grp->il_inp[i] = grp->il_inp[i + 1];
1763                                 grp->il_inpcnt--;
1764                                 inp_localgroup_factor(grp);
1765
1766                                 if (grp->il_inpsiz > INP_LOCALGROUP_SIZMIN &&
1767                                     grp->il_inpcnt <= (grp->il_inpsiz / 4)) {
1768                                         /* Shrink this local group */
1769                                         grp = inp_localgroup_resize(hdr, grp,
1770                                             grp->il_inpsiz / 2);
1771                                 }
1772                         }
1773                         return;
1774                 }
1775         }
1776 }
1777
1778 void
1779 in_pcbremwildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1780 {
1781         struct inpcontainer *ic;
1782         struct inpcontainerhead *head;
1783
1784         in_pcbremlocalgrphash_oncpu(inp, pcbinfo);
1785
1786         /* find bucket */
1787         head = &pcbinfo->wildcardhashbase[
1788             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1789
1790         LIST_FOREACH(ic, head, ic_list) {
1791                 if (ic->ic_inp == inp)
1792                         goto found;
1793         }
1794         return;                 /* not found! */
1795
1796 found:
1797         LIST_REMOVE(ic, ic_list);       /* remove container from bucket chain */
1798         kfree(ic, M_TEMP);              /* deallocate container */
1799 }
1800
1801 /*
1802  * Remove PCB from wildcard hash table.
1803  */
1804 void
1805 in_pcbremwildcardhash(struct inpcb *inp)
1806 {
1807         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1808
1809         KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard"));
1810         in_pcbremwildcardhash_oncpu(inp, pcbinfo);
1811         inp->inp_flags &= ~INP_WILDCARD;
1812 }
1813
1814 /*
1815  * Remove PCB from various lists.
1816  */
1817 void
1818 in_pcbremlists(struct inpcb *inp)
1819 {
1820         struct inpcbinfo *pcbinfo;
1821
1822         if (inp->inp_lport) {
1823                 struct inpcbport *phd;
1824
1825                 pcbinfo = inp->inp_pcbinfo;
1826                 if (pcbinfo->porttoken)
1827                         lwkt_gettoken(pcbinfo->porttoken);
1828
1829                 phd = inp->inp_phd;
1830                 LIST_REMOVE(inp, inp_portlist);
1831                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1832                         LIST_REMOVE(phd, phd_hash);
1833                         kfree(phd, M_PCB);
1834                 }
1835                 if (pcbinfo->porttoken)
1836                         lwkt_reltoken(pcbinfo->porttoken);
1837         }
1838         if (inp->inp_flags & INP_WILDCARD) {
1839                 in_pcbremwildcardhash(inp);
1840         } else if (inp->inp_flags & INP_CONNECTED) {
1841                 in_pcbremconnhash(inp);
1842         }
1843         LIST_REMOVE(inp, inp_list);
1844         inp->inp_pcbinfo->ipi_count--;
1845 }
1846
1847 int
1848 prison_xinpcb(struct thread *td, struct inpcb *inp)
1849 {
1850         struct ucred *cr;
1851
1852         if (td->td_proc == NULL)
1853                 return (0);
1854         cr = td->td_proc->p_ucred;
1855         if (cr->cr_prison == NULL)
1856                 return (0);
1857         if (inp->inp_socket && inp->inp_socket->so_cred &&
1858             inp->inp_socket->so_cred->cr_prison &&
1859             cr->cr_prison == inp->inp_socket->so_cred->cr_prison)
1860                 return (0);
1861         return (1);
1862 }
1863
1864 int
1865 in_pcblist_global(SYSCTL_HANDLER_ARGS)
1866 {
1867         struct inpcbinfo *pcbinfo = arg1;
1868         struct inpcb *inp, *marker;
1869         struct xinpcb xi;
1870         int error, i, n;
1871
1872         /*
1873          * The process of preparing the TCB list is too time-consuming and
1874          * resource-intensive to repeat twice on every request.
1875          */
1876         if (req->oldptr == NULL) {
1877                 n = pcbinfo->ipi_count;
1878                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1879                 return 0;
1880         }
1881
1882         if (req->newptr != NULL)
1883                 return EPERM;
1884
1885         /*
1886          * OK, now we're committed to doing something.  Re-fetch ipi_count
1887          * after obtaining the generation count.
1888          */
1889         n = pcbinfo->ipi_count;
1890
1891         marker = kmalloc(sizeof(struct inpcb), M_TEMP, M_WAITOK|M_ZERO);
1892         marker->inp_flags |= INP_PLACEMARKER;
1893         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
1894
1895         i = 0;
1896         error = 0;
1897
1898         while ((inp = LIST_NEXT(marker, inp_list)) != NULL && i < n) {
1899                 LIST_REMOVE(marker, inp_list);
1900                 LIST_INSERT_AFTER(inp, marker, inp_list);
1901
1902                 if (inp->inp_flags & INP_PLACEMARKER)
1903                         continue;
1904                 if (prison_xinpcb(req->td, inp))
1905                         continue;
1906                 bzero(&xi, sizeof xi);
1907                 xi.xi_len = sizeof xi;
1908                 bcopy(inp, &xi.xi_inp, sizeof *inp);
1909                 if (inp->inp_socket)
1910                         sotoxsocket(inp->inp_socket, &xi.xi_socket);
1911                 if ((error = SYSCTL_OUT(req, &xi, sizeof xi)) != 0)
1912                         break;
1913                 ++i;
1914         }
1915         LIST_REMOVE(marker, inp_list);
1916         if (error == 0 && i < n) {
1917                 bzero(&xi, sizeof xi);
1918                 xi.xi_len = sizeof xi;
1919                 while (i < n) {
1920                         error = SYSCTL_OUT(req, &xi, sizeof xi);
1921                         ++i;
1922                 }
1923         }
1924         kfree(marker, M_TEMP);
1925         return(error);
1926 }
1927
1928 int
1929 in_pcblist_global_nomarker(SYSCTL_HANDLER_ARGS, struct xinpcb **xi0, int *nxi0)
1930 {
1931         struct inpcbinfo *pcbinfo = arg1;
1932         struct inpcb *inp;
1933         struct xinpcb *xi;
1934         int nxi;
1935
1936         *nxi0 = 0;
1937         *xi0 = NULL;
1938
1939         /*
1940          * The process of preparing the PCB list is too time-consuming and
1941          * resource-intensive to repeat twice on every request.
1942          */
1943         if (req->oldptr == NULL) {
1944                 int n = pcbinfo->ipi_count;
1945
1946                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1947                 return 0;
1948         }
1949
1950         if (req->newptr != NULL)
1951                 return EPERM;
1952
1953         if (pcbinfo->ipi_count == 0)
1954                 return 0;
1955
1956         nxi = 0;
1957         xi = kmalloc(pcbinfo->ipi_count * sizeof(*xi), M_TEMP,
1958                      M_WAITOK | M_ZERO | M_NULLOK);
1959         if (xi == NULL)
1960                 return ENOMEM;
1961
1962         LIST_FOREACH(inp, &pcbinfo->pcblisthead, inp_list) {
1963                 struct xinpcb *xi_ptr = &xi[nxi];
1964
1965                 if (prison_xinpcb(req->td, inp))
1966                         continue;
1967
1968                 xi_ptr->xi_len = sizeof(*xi_ptr);
1969                 bcopy(inp, &xi_ptr->xi_inp, sizeof(*inp));
1970                 if (inp->inp_socket)
1971                         sotoxsocket(inp->inp_socket, &xi_ptr->xi_socket);
1972                 ++nxi;
1973         }
1974
1975         if (nxi == 0) {
1976                 kfree(xi, M_TEMP);
1977                 return 0;
1978         }
1979
1980         *nxi0 = nxi;
1981         *xi0 = xi;
1982
1983         return 0;
1984 }
1985
1986 void
1987 in_savefaddr(struct socket *so, const struct sockaddr *faddr)
1988 {
1989         struct sockaddr_in *sin;
1990
1991         KASSERT(faddr->sa_family == AF_INET,
1992             ("not AF_INET faddr %d", faddr->sa_family));
1993
1994         sin = kmalloc(sizeof(*sin), M_SONAME, M_WAITOK | M_ZERO);
1995         sin->sin_family = AF_INET;
1996         sin->sin_len = sizeof(*sin);
1997         sin->sin_port = ((const struct sockaddr_in *)faddr)->sin_port;
1998         sin->sin_addr = ((const struct sockaddr_in *)faddr)->sin_addr;
1999
2000         so->so_faddr = (struct sockaddr *)sin;
2001 }