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. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
  67  * $FreeBSD: src/sys/netinet/in_pcb.c,v 1.59.2.27 2004/01/02 04:06:42 ambrisko Exp $
  68  * $DragonFly: src/sys/netinet/in_pcb.c,v 1.45 2008/03/26 14:44:59 sephe Exp $
  69  */
  70
  71 #include "opt_ipsec.h"
  72 #include "opt_inet6.h"
  73
  74 #include <sys/param.h>
  75 #include <sys/systm.h>
  76 #include <sys/malloc.h>
  77 #include <sys/mbuf.h>
  78 #include <sys/domain.h>
  79 #include <sys/protosw.h>
  80 #include <sys/socket.h>
  81 #include <sys/socketvar.h>
  82 #include <sys/proc.h>
  83 #include <sys/jail.h>
  84 #include <sys/kernel.h>
  85 #include <sys/sysctl.h>
  86 #include <sys/thread2.h>
  87
  88 #include <machine/limits.h>
  89
  90 #include <vm/vm_zone.h>
  91
  92 #include <net/if.h>
  93 #include <net/if_types.h>
  94 #include <net/route.h>
  95
  96 #include <netinet/in.h>
  97 #include <netinet/in_pcb.h>
  98 #include <netinet/in_var.h>
  99 #include <netinet/ip_var.h>
 100 #ifdef INET6
 101 #include <netinet/ip6.h>
 102 #include <netinet6/ip6_var.h>
 103 #endif /* INET6 */
 104
 105 #ifdef IPSEC
 106 #include <netinet6/ipsec.h>
 107 #include <netproto/key/key.h>
 108 #endif
 109
 110 #ifdef FAST_IPSEC
 111 #if defined(IPSEC) || defined(IPSEC_ESP)
 112 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
 113 #endif
 114
 115 #include <netproto/ipsec/ipsec.h>
 116 #include <netproto/ipsec/key.h>
 117 #define IPSEC
 118 #endif /* FAST_IPSEC */
 119
 120 struct in_addr zeroin_addr;
 121
 122 /*
 123  * These configure the range of local port addresses assigned to
 124  * "unspecified" outgoing connections/packets/whatever.
 125  */
 126 int ipport_lowfirstauto = IPPORT_RESERVED - 1;  /* 1023 */
 127 int ipport_lowlastauto = IPPORT_RESERVEDSTART;  /* 600 */
 128
 129 int ipport_firstauto = IPPORT_RESERVED;         /* 1024 */
 130 int ipport_lastauto = IPPORT_USERRESERVED;      /* 5000 */
 131
 132 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO;    /* 49152 */
 133 int ipport_hilastauto = IPPORT_HILASTAUTO;      /* 65535 */
 134
 135 static __inline void
 136 RANGECHK(int var, int min, int max)
 137 {
 138         if (var < min)
 139                 var = min;
 140         else if (var > max)
 141                 var = max;
 142 }
 143
 144 static int
 145 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 146 {
 147         int error;
 148
 149         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 150         if (!error) {
 151                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 152                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 153
 154                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
 155                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
 156
 157                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
 158                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
 159         }
 160         return (error);
 161 }
 162
 163 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 164
 165 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
 166            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
 167 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
 168            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
 169 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
 170            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
 171 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
 172            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
 173 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
 174            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
 175 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
 176            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
 177
 178 /*
 179  * in_pcb.c: manage the Protocol Control Blocks.
 180  *
 181  * NOTE: It is assumed that most of these functions will be called from
 182  * a critical section.  XXX - There are, unfortunately, a few exceptions
 183  * to this rule that should be fixed.
 184  *
 185  * NOTE: The caller should initialize the cpu field to the cpu running the
 186  * protocol stack associated with this inpcbinfo.
 187  */
 188
 189 void
 190 in_pcbinfo_init(struct inpcbinfo *pcbinfo)
 191 {
 192         LIST_INIT(&pcbinfo->pcblisthead);
 193         pcbinfo->cpu = -1;
 194 }
 195
 196 /*
 197  * Allocate a PCB and associate it with the socket.
 198  */
 199 int
 200 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 201 {
 202         struct inpcb *inp;
 203 #ifdef IPSEC
 204         int error;
 205 #endif
 206
 207         inp = zalloc(pcbinfo->ipi_zone);
 208         if (inp == NULL)
 209                 return (ENOBUFS);
 210         bzero(inp, sizeof *inp);
 211         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 212         inp->inp_pcbinfo = inp->inp_cpcbinfo = pcbinfo;
 213         inp->inp_socket = so;
 214 #ifdef IPSEC
 215         error = ipsec_init_policy(so, &inp->inp_sp);
 216         if (error != 0) {
 217                 zfree(pcbinfo->ipi_zone, inp);
 218                 return (error);
 219         }
 220 #endif
 221 #ifdef INET6
 222         if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only)
 223                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
 224         if (ip6_auto_flowlabel)
 225                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 226 #endif
 227         so->so_pcb = inp;
 228         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
 229         pcbinfo->ipi_count++;
 230         return (0);
 231 }
 232
 233 int
 234 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 235 {
 236         struct socket *so = inp->inp_socket;
 237         struct proc *p = td->td_proc;
 238         unsigned short *lastport;
 239         struct sockaddr_in *sin;
 240         struct sockaddr_in jsin;
 241         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 242         struct ucred *cred = NULL;
 243         u_short lport = 0;
 244         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 245         int error;
 246
 247         KKASSERT(p);
 248
 249         if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
 250                 return (EADDRNOTAVAIL);
 251         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 252                 return (EINVAL);        /* already bound */
 253         if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT)))
 254                 wild = 1;    /* neither SO_REUSEADDR nor SO_REUSEPORT is set */
 255         if (p)
 256                 cred = p->p_ucred;
 257         if (nam != NULL) {
 258                 sin = (struct sockaddr_in *)nam;
 259                 if (nam->sa_len != sizeof *sin)
 260                         return (EINVAL);
 261 #ifdef notdef
 262                 /*
 263                  * We should check the family, but old programs
 264                  * incorrectly fail to initialize it.
 265                  */
 266                 if (sin->sin_family != AF_INET)
 267                         return (EAFNOSUPPORT);
 268 #endif
 269                 if (!prison_replace_wildcards(td, nam))
 270                                 return (EINVAL);
 271                 lport = sin->sin_port;
 272                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 273                         /*
 274                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 275                          * allow complete duplication of binding if
 276                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 277                          * and a multicast address is bound on both
 278                          * new and duplicated sockets.
 279                          */
 280                         if (so->so_options & SO_REUSEADDR)
 281                                 reuseport = SO_REUSEADDR | SO_REUSEPORT;
 282                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 283                         sin->sin_port = 0;              /* yech... */
 284                         bzero(&sin->sin_zero, sizeof sin->sin_zero);
 285                         if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL)
 286                                 return (EADDRNOTAVAIL);
 287                 }
 288                 if (lport != 0) {
 289                         struct inpcb *t;
 290
 291                         /* GROSS */
 292                         if (ntohs(lport) < IPPORT_RESERVED &&
 293                             cred && suser_cred(cred, PRISON_ROOT))
 294                                 return (EACCES);
 295                         if (so->so_cred->cr_uid != 0 &&
 296                             !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 297                                 t = in_pcblookup_local(inp->inp_pcbinfo,
 298                                     sin->sin_addr, lport,
 299                                     INPLOOKUP_WILDCARD, cred);
 300                                 if (t &&
 301                                     (!in_nullhost(sin->sin_addr) ||
 302                                      !in_nullhost(t->inp_laddr) ||
 303                                      (t->inp_socket->so_options &
 304                                          SO_REUSEPORT) == 0) &&
 305                                     (so->so_cred->cr_uid !=
 306                                      t->inp_socket->so_cred->cr_uid)) {
 307 #ifdef INET6
 308                                         if (!in_nullhost(sin->sin_addr) ||
 309                                             !in_nullhost(t->inp_laddr) ||
 310                                             INP_SOCKAF(so) ==
 311                                             INP_SOCKAF(t->inp_socket))
 312 #endif
 313                                         return (EADDRINUSE);
 314                                 }
 315                         }
 316                         if (cred && !prison_replace_wildcards(td, nam))
 317                                 return (EADDRNOTAVAIL);
 318                         t = in_pcblookup_local(pcbinfo, sin->sin_addr, lport,
 319                                                wild, cred);
 320                         if (t && !(reuseport & t->inp_socket->so_options)) {
 321 #ifdef INET6
 322                                 if (!in_nullhost(sin->sin_addr) ||
 323                                     !in_nullhost(t->inp_laddr) ||
 324                                     INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
 325 #endif
 326                                 return (EADDRINUSE);
 327                         }
 328                 }
 329                 inp->inp_laddr = sin->sin_addr;
 330         }
 331         if (lport == 0) {
 332                 ushort first, last;
 333                 int count;
 334
 335                 jsin.sin_family = AF_INET;
 336                 jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 337                 if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
 338                         inp->inp_laddr.s_addr = INADDR_ANY;
 339                         return (EINVAL);
 340                 }
 341                 inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 342
 343                 inp->inp_flags |= INP_ANONPORT;
 344
 345                 if (inp->inp_flags & INP_HIGHPORT) {
 346                         first = ipport_hifirstauto;     /* sysctl */
 347                         last  = ipport_hilastauto;
 348                         lastport = &pcbinfo->lasthi;
 349                 } else if (inp->inp_flags & INP_LOWPORT) {
 350                         if (cred &&
 351                             (error = suser_cred(cred, PRISON_ROOT))) {
 352                                 inp->inp_laddr.s_addr = INADDR_ANY;
 353                                 return (error);
 354                         }
 355                         first = ipport_lowfirstauto;    /* 1023 */
 356                         last  = ipport_lowlastauto;     /* 600 */
 357                         lastport = &pcbinfo->lastlow;
 358                 } else {
 359                         first = ipport_firstauto;       /* sysctl */
 360                         last  = ipport_lastauto;
 361                         lastport = &pcbinfo->lastport;
 362                 }
 363                 /*
 364                  * Simple check to ensure all ports are not used up causing
 365                  * a deadlock here.
 366                  *
 367                  * We split the two cases (up and down) so that the direction
 368                  * is not being tested on each round of the loop.
 369                  */
 370                 if (first > last) {
 371                         /*
 372                          * counting down
 373                          */
 374                         count = first - last;
 375
 376                         do {
 377                                 if (count-- < 0) {      /* completely used? */
 378                                         inp->inp_laddr.s_addr = INADDR_ANY;
 379                                         return (EADDRNOTAVAIL);
 380                                 }
 381                                 --*lastport;
 382                                 if (*lastport > first || *lastport < last)
 383                                         *lastport = first;
 384                                 lport = htons(*lastport);
 385                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
 386                                  lport, wild, cred));
 387                 } else {
 388                         /*
 389                          * counting up
 390                          */
 391                         count = last - first;
 392
 393                         do {
 394                                 if (count-- < 0) {      /* completely used? */
 395                                         inp->inp_laddr.s_addr = INADDR_ANY;
 396                                         return (EADDRNOTAVAIL);
 397                                 }
 398                                 ++*lastport;
 399                                 if (*lastport < first || *lastport > last)
 400                                         *lastport = first;
 401                                 lport = htons(*lastport);
 402                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
 403                                  lport, wild, cred));
 404                 }
 405         }
 406         inp->inp_lport = lport;
 407
 408         jsin.sin_family = AF_INET;
 409         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 410         if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin)) {
 411                 inp->inp_laddr.s_addr = INADDR_ANY;
 412                 inp->inp_lport = 0;
 413                 return (EINVAL);
 414         }
 415         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 416
 417         if (in_pcbinsporthash(inp) != 0) {
 418                 inp->inp_laddr.s_addr = INADDR_ANY;
 419                 inp->inp_lport = 0;
 420                 return (EAGAIN);
 421         }
 422         return (0);
 423 }
 424
 425 /*
 426  *   Transform old in_pcbconnect() into an inner subroutine for new
 427  *   in_pcbconnect(): Do some validity-checking on the remote
 428  *   address (in mbuf 'nam') and then determine local host address
 429  *   (i.e., which interface) to use to access that remote host.
 430  *
 431  *   This preserves definition of in_pcbconnect(), while supporting a
 432  *   slightly different version for T/TCP.  (This is more than
 433  *   a bit of a kludge, but cleaning up the internal interfaces would
 434  *   have forced minor changes in every protocol).
 435  */
 436 int
 437 in_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 438         struct sockaddr_in **plocal_sin, struct thread *td)
 439 {
 440         struct in_ifaddr *ia;
 441         struct ucred *cred = NULL;
 442         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 443         struct sockaddr *jsin;
 444         int jailed = 0, alloc_route = 0;
 445
 446         if (nam->sa_len != sizeof *sin)
 447                 return (EINVAL);
 448         if (sin->sin_family != AF_INET)
 449                 return (EAFNOSUPPORT);
 450         if (sin->sin_port == 0)
 451                 return (EADDRNOTAVAIL);
 452         if (td && td->td_proc && td->td_proc->p_ucred)
 453                 cred = td->td_proc->p_ucred;
 454         if (cred && cred->cr_prison)
 455                 jailed = 1;
 456         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 457                 ia = TAILQ_FIRST(&in_ifaddrhead);
 458                 /*
 459                  * If the destination address is INADDR_ANY,
 460                  * use the primary local address.
 461                  * If the supplied address is INADDR_BROADCAST,
 462                  * and the primary interface supports broadcast,
 463                  * choose the broadcast address for that interface.
 464                  */
 465                 if (sin->sin_addr.s_addr == INADDR_ANY)
 466                         sin->sin_addr = IA_SIN(ia)->sin_addr;
 467                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
 468                     (ia->ia_ifp->if_flags & IFF_BROADCAST))
 469                         sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
 470         }
 471         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 472                 struct route *ro;
 473
 474                 ia = (struct in_ifaddr *)NULL;
 475                 /*
 476                  * If route is known or can be allocated now,
 477                  * our src addr is taken from the i/f, else punt.
 478                  * Note that we should check the address family of the cached
 479                  * destination, in case of sharing the cache with IPv6.
 480                  */
 481                 ro = &inp->inp_route;
 482                 if (ro->ro_rt &&
 483                     (!(ro->ro_rt->rt_flags & RTF_UP) ||
 484                      ro->ro_dst.sa_family != AF_INET ||
 485                      satosin(&ro->ro_dst)->sin_addr.s_addr !=
 486                                       sin->sin_addr.s_addr ||
 487                      inp->inp_socket->so_options & SO_DONTROUTE)) {
 488                         RTFREE(ro->ro_rt);
 489                         ro->ro_rt = (struct rtentry *)NULL;
 490                 }
 491                 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 492                     (ro->ro_rt == (struct rtentry *)NULL ||
 493                     ro->ro_rt->rt_ifp == (struct ifnet *)NULL)) {
 494                         /* No route yet, so try to acquire one */
 495                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 496                         ro->ro_dst.sa_family = AF_INET;
 497                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 498                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
 499                                 sin->sin_addr;
 500                         rtalloc(ro);
 501                         alloc_route = 1;
 502                 }
 503                 /*
 504                  * If we found a route, use the address
 505                  * corresponding to the outgoing interface
 506                  * unless it is the loopback (in case a route
 507                  * to our address on another net goes to loopback).
 508                  */
 509                 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) {
 510                         if (jailed) {
 511                                 if (jailed_ip(cred->cr_prison,
 512                                     ro->ro_rt->rt_ifa->ifa_addr)) {
 513                                         ia = ifatoia(ro->ro_rt->rt_ifa);
 514                                 }
 515                         } else {
 516                                 ia = ifatoia(ro->ro_rt->rt_ifa);
 517                         }
 518                 }
 519                 if (ia == NULL) {
 520                         u_short fport = sin->sin_port;
 521
 522                         sin->sin_port = 0;
 523                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
 524                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 525                             sintosa(&ia->ia_addr)))
 526                                 ia = NULL;
 527                         if (ia == NULL)
 528                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
 529                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 530                             sintosa(&ia->ia_addr)))
 531                                 ia = NULL;
 532                         sin->sin_port = fport;
 533                         if (ia == NULL)
 534                                 ia = TAILQ_FIRST(&in_ifaddrhead);
 535                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 536                             sintosa(&ia->ia_addr)))
 537                                 ia = NULL;
 538
 539                         if (!jailed && ia == NULL)
 540                                 goto fail;
 541                 }
 542                 /*
 543                  * If the destination address is multicast and an outgoing
 544                  * interface has been set as a multicast option, use the
 545                  * address of that interface as our source address.
 546                  */
 547                 if (!jailed && IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 548                     inp->inp_moptions != NULL) {
 549                         struct ip_moptions *imo;
 550                         struct ifnet *ifp;
 551
 552                         imo = inp->inp_moptions;
 553                         if (imo->imo_multicast_ifp != NULL) {
 554                                 ifp = imo->imo_multicast_ifp;
 555                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
 556                                         if (ia->ia_ifp == ifp)
 557                                                 break;
 558                                 if (ia == NULL)
 559                                         goto fail;
 560                         }
 561                 }
 562                 /*
 563                  * Don't do pcblookup call here; return interface in plocal_sin
 564                  * and exit to caller, that will do the lookup.
 565                  */
 566                 if (ia == NULL && jailed) {
 567                         if ((jsin = prison_get_nonlocal(cred->cr_prison, AF_INET, NULL)) != NULL ||
 568                             (jsin = prison_get_local(cred->cr_prison, AF_INET, NULL)) != NULL) {
 569                                 *plocal_sin = satosin(jsin);
 570                         } else {
 571                                 /* IPv6 only Jail */
 572                                 goto fail;
 573                         }
 574                 } else {
 575                         *plocal_sin = &ia->ia_addr;
 576                 }
 577         }
 578         return (0);
 579 fail:
 580         if (alloc_route) {
 581                 struct route *ro = &inp->inp_route;
 582
 583                 if (ro->ro_rt != NULL)
 584                         RTFREE(ro->ro_rt);
 585                 bzero(ro, sizeof(*ro));
 586         }
 587         return (EADDRNOTAVAIL);
 588 }
 589
 590 /*
 591  * Outer subroutine:
 592  * Connect from a socket to a specified address.
 593  * Both address and port must be specified in argument sin.
 594  * If don't have a local address for this socket yet,
 595  * then pick one.
 596  */
 597 int
 598 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 599 {
 600         struct sockaddr_in *if_sin;
 601         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 602         int error;
 603
 604         /* Call inner routine to assign local interface address. */
 605         if ((error = in_pcbladdr(inp, nam, &if_sin, td)) != 0)
 606                 return (error);
 607
 608         if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port,
 609             inp->inp_laddr.s_addr ? inp->inp_laddr : if_sin->sin_addr,
 610             inp->inp_lport, FALSE, NULL) != NULL) {
 611                 return (EADDRINUSE);
 612         }
 613         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 614                 if (inp->inp_lport == 0) {
 615                         error = in_pcbbind(inp, (struct sockaddr *)NULL, td);
 616                         if (error)
 617                                 return (error);
 618                 }
 619                 inp->inp_laddr = if_sin->sin_addr;
 620         }
 621         inp->inp_faddr = sin->sin_addr;
 622         inp->inp_fport = sin->sin_port;
 623         in_pcbinsconnhash(inp);
 624         return (0);
 625 }
 626
 627 void
 628 in_pcbdisconnect(struct inpcb *inp)
 629 {
 630
 631         inp->inp_faddr.s_addr = INADDR_ANY;
 632         inp->inp_fport = 0;
 633         in_pcbremconnhash(inp);
 634         if (inp->inp_socket->so_state & SS_NOFDREF)
 635                 in_pcbdetach(inp);
 636 }
 637
 638 void
 639 in_pcbdetach(struct inpcb *inp)
 640 {
 641         struct socket *so = inp->inp_socket;
 642         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 643
 644 #ifdef IPSEC
 645         ipsec4_delete_pcbpolicy(inp);
 646 #endif /*IPSEC*/
 647         inp->inp_gencnt = ++ipi->ipi_gencnt;
 648         in_pcbremlists(inp);
 649         so->so_pcb = 0;
 650         sofree(so);
 651         if (inp->inp_options)
 652                 m_free(inp->inp_options);
 653         if (inp->inp_route.ro_rt)
 654                 rtfree(inp->inp_route.ro_rt);
 655         ip_freemoptions(inp->inp_moptions);
 656         inp->inp_vflag = 0;
 657         zfree(ipi->ipi_zone, inp);
 658 }
 659
 660 /*
 661  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
 662  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 663  * in struct pr_usrreqs, so that protocols can just reference then directly
 664  * without the need for a wrapper function.  The socket must have a valid
 665  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 666  * except through a kernel programming error, so it is acceptable to panic
 667  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 668  * because there actually /is/ a programming error somewhere... XXX)
 669  */
 670 int
 671 in_setsockaddr(struct socket *so, struct sockaddr **nam)
 672 {
 673         struct inpcb *inp;
 674         struct sockaddr_in *sin;
 675
 676         /*
 677          * Do the malloc first in case it blocks.
 678          */
 679         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 680                 M_WAITOK | M_ZERO);
 681         sin->sin_family = AF_INET;
 682         sin->sin_len = sizeof *sin;
 683
 684         crit_enter();
 685         inp = so->so_pcb;
 686         if (!inp) {
 687                 crit_exit();
 688                 kfree(sin, M_SONAME);
 689                 return (ECONNRESET);
 690         }
 691         sin->sin_port = inp->inp_lport;
 692         sin->sin_addr = inp->inp_laddr;
 693         crit_exit();
 694
 695         *nam = (struct sockaddr *)sin;
 696         return (0);
 697 }
 698
 699 int
 700 in_setpeeraddr(struct socket *so, struct sockaddr **nam)
 701 {
 702         struct inpcb *inp;
 703         struct sockaddr_in *sin;
 704
 705         /*
 706          * Do the malloc first in case it blocks.
 707          */
 708         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 709                 M_WAITOK | M_ZERO);
 710         sin->sin_family = AF_INET;
 711         sin->sin_len = sizeof *sin;
 712
 713         crit_enter();
 714         inp = so->so_pcb;
 715         if (!inp) {
 716                 crit_exit();
 717                 kfree(sin, M_SONAME);
 718                 return (ECONNRESET);
 719         }
 720         sin->sin_port = inp->inp_fport;
 721         sin->sin_addr = inp->inp_faddr;
 722         crit_exit();
 723
 724         *nam = (struct sockaddr *)sin;
 725         return (0);
 726 }
 727
 728 void
 729 in_pcbnotifyall(struct inpcbhead *head, struct in_addr faddr, int err,
 730                 void (*notify)(struct inpcb *, int))
 731 {
 732         struct inpcb *inp, *ninp;
 733
 734         /*
 735          * note: if INP_PLACEMARKER is set we must ignore the rest of
 736          * the structure and skip it.
 737          */
 738         crit_enter();
 739         LIST_FOREACH_MUTABLE(inp, head, inp_list, ninp) {
 740                 if (inp->inp_flags & INP_PLACEMARKER)
 741                         continue;
 742 #ifdef INET6
 743                 if (!(inp->inp_vflag & INP_IPV4))
 744                         continue;
 745 #endif
 746                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 747                     inp->inp_socket == NULL)
 748                         continue;
 749                 (*notify)(inp, err);            /* can remove inp from list! */
 750         }
 751         crit_exit();
 752 }
 753
 754 void
 755 in_pcbpurgeif0(struct inpcb *head, struct ifnet *ifp)
 756 {
 757         struct inpcb *inp;
 758         struct ip_moptions *imo;
 759         int i, gap;
 760
 761         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
 762                 if (inp->inp_flags & INP_PLACEMARKER)
 763                         continue;
 764                 imo = inp->inp_moptions;
 765                 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) {
 766                         /*
 767                          * Unselect the outgoing interface if it is being
 768                          * detached.
 769                          */
 770                         if (imo->imo_multicast_ifp == ifp)
 771                                 imo->imo_multicast_ifp = NULL;
 772
 773                         /*
 774                          * Drop multicast group membership if we joined
 775                          * through the interface being detached.
 776                          */
 777                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 778                             i++) {
 779                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 780                                         in_delmulti(imo->imo_membership[i]);
 781                                         gap++;
 782                                 } else if (gap != 0)
 783                                         imo->imo_membership[i - gap] =
 784                                             imo->imo_membership[i];
 785                         }
 786                         imo->imo_num_memberships -= gap;
 787                 }
 788         }
 789 }
 790
 791 /*
 792  * Check for alternatives when higher level complains
 793  * about service problems.  For now, invalidate cached
 794  * routing information.  If the route was created dynamically
 795  * (by a redirect), time to try a default gateway again.
 796  */
 797 void
 798 in_losing(struct inpcb *inp)
 799 {
 800         struct rtentry *rt;
 801         struct rt_addrinfo rtinfo;
 802
 803         if ((rt = inp->inp_route.ro_rt)) {
 804                 bzero(&rtinfo, sizeof(struct rt_addrinfo));
 805                 rtinfo.rti_info[RTAX_DST] = rt_key(rt);
 806                 rtinfo.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 807                 rtinfo.rti_info[RTAX_NETMASK] = rt_mask(rt);
 808                 rtinfo.rti_flags = rt->rt_flags;
 809                 rt_missmsg(RTM_LOSING, &rtinfo, rt->rt_flags, 0);
 810                 if (rt->rt_flags & RTF_DYNAMIC)
 811                         rtrequest1_global(RTM_DELETE, &rtinfo, NULL, NULL);
 812                 inp->inp_route.ro_rt = NULL;
 813                 rtfree(rt);
 814                 /*
 815                  * A new route can be allocated
 816                  * the next time output is attempted.
 817                  */
 818         }
 819 }
 820
 821 /*
 822  * After a routing change, flush old routing
 823  * and allocate a (hopefully) better one.
 824  */
 825 void
 826 in_rtchange(struct inpcb *inp, int err)
 827 {
 828         if (inp->inp_route.ro_rt) {
 829                 rtfree(inp->inp_route.ro_rt);
 830                 inp->inp_route.ro_rt = NULL;
 831                 /*
 832                  * A new route can be allocated the next time
 833                  * output is attempted.
 834                  */
 835         }
 836 }
 837
 838 /*
 839  * Lookup a PCB based on the local address and port.
 840  */
 841 struct inpcb *
 842 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 843                    u_int lport_arg, int wild_okay, struct ucred *cred)
 844 {
 845         struct inpcb *inp;
 846         int matchwild = 3, wildcard;
 847         u_short lport = lport_arg;
 848
 849         struct inpcbporthead *porthash;
 850         struct inpcbport *phd;
 851         struct inpcb *match = NULL;
 852
 853         /*
 854          * Best fit PCB lookup.
 855          *
 856          * First see if this local port is in use by looking on the
 857          * port hash list.
 858          */
 859         porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 860             pcbinfo->porthashmask)];
 861         LIST_FOREACH(phd, porthash, phd_hash) {
 862                 if (phd->phd_port == lport)
 863                         break;
 864         }
 865         if (phd != NULL) {
 866                 /*
 867                  * Port is in use by one or more PCBs. Look for best
 868                  * fit.
 869                  */
 870                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 871                         wildcard = 0;
 872 #ifdef INET6
 873                         if ((inp->inp_vflag & INP_IPV4) == 0)
 874                                 continue;
 875 #endif
 876                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 877                                 wildcard++;
 878                         if (inp->inp_laddr.s_addr != INADDR_ANY) {
 879                                 if (laddr.s_addr == INADDR_ANY)
 880                                         wildcard++;
 881                                 else if (inp->inp_laddr.s_addr != laddr.s_addr)
 882                                         continue;
 883                         } else {
 884                                 if (laddr.s_addr != INADDR_ANY)
 885                                         wildcard++;
 886                         }
 887                         if (wildcard && !wild_okay)
 888                                 continue;
 889                         if (wildcard < matchwild &&
 890                             (cred == NULL ||
 891                              cred->cr_prison ==
 892                                         inp->inp_socket->so_cred->cr_prison)) {
 893                                 match = inp;
 894                                 matchwild = wildcard;
 895                                 if (matchwild == 0) {
 896                                         break;
 897                                 }
 898                         }
 899                 }
 900         }
 901         return (match);
 902 }
 903
 904 /*
 905  * Lookup PCB in hash list.
 906  */
 907 struct inpcb *
 908 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport_arg,
 909                   struct in_addr laddr, u_int lport_arg, boolean_t wildcard,
 910                   struct ifnet *ifp)
 911 {
 912         struct inpcbhead *head;
 913         struct inpcb *inp, *jinp=NULL;
 914         u_short fport = fport_arg, lport = lport_arg;
 915
 916         /*
 917          * First look for an exact match.
 918          */
 919         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport,
 920             laddr.s_addr, lport, pcbinfo->hashmask)];
 921         LIST_FOREACH(inp, head, inp_hash) {
 922 #ifdef INET6
 923                 if (!(inp->inp_vflag & INP_IPV4))
 924                         continue;
 925 #endif
 926                 if (in_hosteq(inp->inp_faddr, faddr) &&
 927                     in_hosteq(inp->inp_laddr, laddr) &&
 928                     inp->inp_fport == fport && inp->inp_lport == lport) {
 929                         /* found */
 930                         if (inp->inp_socket == NULL ||
 931                             inp->inp_socket->so_cred->cr_prison == NULL) {
 932                                 return (inp);
 933                         } else {
 934                                 if  (jinp == NULL)
 935                                         jinp = inp;
 936                         }
 937                 }
 938         }
 939         if (jinp != NULL)
 940                 return (jinp);
 941         if (wildcard) {
 942                 struct inpcb *local_wild = NULL;
 943                 struct inpcb *jinp_wild = NULL;
 944 #ifdef INET6
 945                 struct inpcb *local_wild_mapped = NULL;
 946 #endif
 947                 struct inpcontainer *ic;
 948                 struct inpcontainerhead *chead;
 949                 struct sockaddr_in jsin;
 950                 struct ucred *cred;
 951
 952                 /*
 953                  * Order of socket selection:
 954                  * 1. non-jailed, non-wild.
 955                  * 2. non-jailed, wild.
 956                  * 3. jailed, non-wild.
 957                  * 4. jailed, wild.
 958                  */
 959                 jsin.sin_family = AF_INET;
 960                 chead = &pcbinfo->wildcardhashbase[
 961                     INP_PCBWILDCARDHASH(lport, pcbinfo->wildcardhashmask)];
 962                 LIST_FOREACH(ic, chead, ic_list) {
 963                         inp = ic->ic_inp;
 964                         jsin.sin_addr.s_addr = laddr.s_addr;
 965 #ifdef INET6
 966                         if (!(inp->inp_vflag & INP_IPV4))
 967                                 continue;
 968 #endif
 969                         if (inp->inp_socket != NULL)
 970                                 cred = inp->inp_socket->so_cred;
 971                         else
 972                                 cred = NULL;
 973                         if (cred != NULL && jailed(cred)) {
 974                                 if (jinp != NULL)
 975                                         continue;
 976                                 else
 977                                         if (!jailed_ip(cred->cr_prison,
 978                                             (struct sockaddr *)&jsin))
 979                                                 continue;
 980                         }
 981                         if (inp->inp_lport == lport) {
 982                                 if (ifp && ifp->if_type == IFT_FAITH &&
 983                                     !(inp->inp_flags & INP_FAITH))
 984                                         continue;
 985                                 if (inp->inp_laddr.s_addr == laddr.s_addr) {
 986                                         if (cred != NULL && jailed(cred))
 987                                                 jinp = inp;
 988                                         else
 989                                                 return (inp);
 990                                 }
 991                                 if (inp->inp_laddr.s_addr == INADDR_ANY) {
 992 #ifdef INET6
 993                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
 994                                                              AF_INET6))
 995                                                 local_wild_mapped = inp;
 996                                         else
 997 #endif
 998                                                 if (cred != NULL &&
 999                                                     jailed(cred))
1000                                                         jinp_wild = inp;
1001                                                 else
1002                                                         local_wild = inp;
1003                                 }
1004                         }
1005                 }
1006                 if (local_wild != NULL)
1007                         return (local_wild);
1008 #ifdef INET6
1009                 if (local_wild_mapped != NULL)
1010                         return (local_wild_mapped);
1011 #endif
1012                 if (jinp != NULL)
1013                         return (jinp);
1014                 return (jinp_wild);
1015         }
1016
1017         /*
1018          * Not found.
1019          */
1020         return (NULL);
1021 }
1022
1023 /*
1024  * Insert PCB into connection hash table.
1025  */
1026 void
1027 in_pcbinsconnhash(struct inpcb *inp)
1028 {
1029         struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo;
1030         struct inpcbhead *bucket;
1031         u_int32_t hashkey_faddr, hashkey_laddr;
1032
1033 #ifdef INET6
1034         if (inp->inp_vflag & INP_IPV6) {
1035                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */;
1036                 hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */;
1037         } else {
1038 #endif
1039                 hashkey_faddr = inp->inp_faddr.s_addr;
1040                 hashkey_laddr = inp->inp_laddr.s_addr;
1041 #ifdef INET6
1042         }
1043 #endif
1044
1045         KASSERT(!(inp->inp_flags & INP_CONNECTED), ("already on hash list"));
1046         inp->inp_flags |= INP_CONNECTED;
1047
1048         /*
1049          * Insert into the connection hash table.
1050          */
1051         bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr,
1052             inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)];
1053         LIST_INSERT_HEAD(bucket, inp, inp_hash);
1054 }
1055
1056 /*
1057  * Remove PCB from connection hash table.
1058  */
1059 void
1060 in_pcbremconnhash(struct inpcb *inp)
1061 {
1062         KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected"));
1063         LIST_REMOVE(inp, inp_hash);
1064         inp->inp_flags &= ~INP_CONNECTED;
1065 }
1066
1067 /*
1068  * Insert PCB into port hash table.
1069  */
1070 int
1071 in_pcbinsporthash(struct inpcb *inp)
1072 {
1073         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1074         struct inpcbporthead *pcbporthash;
1075         struct inpcbport *phd;
1076
1077         /*
1078          * Insert into the port hash table.
1079          */
1080         pcbporthash = &pcbinfo->porthashbase[
1081             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->porthashmask)];
1082
1083         /* Go through port list and look for a head for this lport. */
1084         LIST_FOREACH(phd, pcbporthash, phd_hash)
1085                 if (phd->phd_port == inp->inp_lport)
1086                         break;
1087
1088         /* If none exists, malloc one and tack it on. */
1089         if (phd == NULL) {
1090                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport),
1091                     M_PCB, M_INTWAIT | M_NULLOK);
1092                 if (phd == NULL)
1093                         return (ENOBUFS); /* XXX */
1094                 phd->phd_port = inp->inp_lport;
1095                 LIST_INIT(&phd->phd_pcblist);
1096                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1097         }
1098
1099         inp->inp_phd = phd;
1100         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1101
1102         return (0);
1103 }
1104
1105 void
1106 in_pcbinswildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1107 {
1108         struct inpcontainer *ic;
1109         struct inpcontainerhead *bucket;
1110
1111         bucket = &pcbinfo->wildcardhashbase[
1112             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1113
1114         ic = kmalloc(sizeof(struct inpcontainer), M_TEMP, M_INTWAIT);
1115         ic->ic_inp = inp;
1116         LIST_INSERT_HEAD(bucket, ic, ic_list);
1117 }
1118
1119 /*
1120  * Insert PCB into wildcard hash table.
1121  */
1122 void
1123 in_pcbinswildcardhash(struct inpcb *inp)
1124 {
1125         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1126
1127         KKASSERT(pcbinfo != NULL);
1128
1129         in_pcbinswildcardhash_oncpu(inp, pcbinfo);
1130         inp->inp_flags |= INP_WILDCARD;
1131 }
1132
1133 void
1134 in_pcbremwildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1135 {
1136         struct inpcontainer *ic;
1137         struct inpcontainerhead *head;
1138
1139         /* find bucket */
1140         head = &pcbinfo->wildcardhashbase[
1141             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1142
1143         LIST_FOREACH(ic, head, ic_list) {
1144                 if (ic->ic_inp == inp)
1145                         goto found;
1146         }
1147         return;                 /* not found! */
1148
1149 found:
1150         LIST_REMOVE(ic, ic_list);       /* remove container from bucket chain */
1151         kfree(ic, M_TEMP);              /* deallocate container */
1152 }
1153
1154 /*
1155  * Remove PCB from wildcard hash table.
1156  */
1157 void
1158 in_pcbremwildcardhash(struct inpcb *inp)
1159 {
1160         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1161
1162         KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard"));
1163         in_pcbremwildcardhash_oncpu(inp, pcbinfo);
1164         inp->inp_flags &= ~INP_WILDCARD;
1165 }
1166
1167 /*
1168  * Remove PCB from various lists.
1169  */
1170 void
1171 in_pcbremlists(struct inpcb *inp)
1172 {
1173         if (inp->inp_lport) {
1174                 struct inpcbport *phd = inp->inp_phd;
1175
1176                 LIST_REMOVE(inp, inp_portlist);
1177                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1178                         LIST_REMOVE(phd, phd_hash);
1179                         kfree(phd, M_PCB);
1180                 }
1181         }
1182         if (inp->inp_flags & INP_WILDCARD) {
1183                 in_pcbremwildcardhash(inp);
1184         } else if (inp->inp_flags & INP_CONNECTED) {
1185                 in_pcbremconnhash(inp);
1186         }
1187         LIST_REMOVE(inp, inp_list);
1188         inp->inp_pcbinfo->ipi_count--;
1189 }
1190
1191 int
1192 prison_xinpcb(struct thread *td, struct inpcb *inp)
1193 {
1194         struct ucred *cr;
1195
1196         if (td->td_proc == NULL)
1197                 return (0);
1198         cr = td->td_proc->p_ucred;
1199         if (cr->cr_prison == NULL)
1200                 return (0);
1201         if (inp->inp_socket && inp->inp_socket->so_cred &&
1202             inp->inp_socket->so_cred->cr_prison &&
1203             cr->cr_prison == inp->inp_socket->so_cred->cr_prison)
1204                 return (0);
1205         return (1);
1206 }
1207
1208 int
1209 in_pcblist_global(SYSCTL_HANDLER_ARGS)
1210 {
1211         struct inpcbinfo *pcbinfo = arg1;
1212         struct inpcb *inp, *marker;
1213         struct xinpcb xi;
1214         int error, i, n;
1215         inp_gen_t gencnt;
1216
1217         /*
1218          * The process of preparing the TCB list is too time-consuming and
1219          * resource-intensive to repeat twice on every request.
1220          */
1221         if (req->oldptr == NULL) {
1222                 n = pcbinfo->ipi_count;
1223                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1224                 return 0;
1225         }
1226
1227         if (req->newptr != NULL)
1228                 return EPERM;
1229
1230         /*
1231          * OK, now we're committed to doing something.  Re-fetch ipi_count
1232          * after obtaining the generation count.
1233          */
1234         gencnt = pcbinfo->ipi_gencnt;
1235         n = pcbinfo->ipi_count;
1236
1237         marker = kmalloc(sizeof(struct inpcb), M_TEMP, M_WAITOK|M_ZERO);
1238         marker->inp_flags |= INP_PLACEMARKER;
1239         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
1240
1241         i = 0;
1242         error = 0;
1243
1244         while ((inp = LIST_NEXT(marker, inp_list)) != NULL && i < n) {
1245                 LIST_REMOVE(marker, inp_list);
1246                 LIST_INSERT_AFTER(inp, marker, inp_list);
1247
1248                 if (inp->inp_flags & INP_PLACEMARKER)
1249                         continue;
1250                 if (inp->inp_gencnt > gencnt)
1251                         continue;
1252                 if (prison_xinpcb(req->td, inp))
1253                         continue;
1254                 bzero(&xi, sizeof xi);
1255                 xi.xi_len = sizeof xi;
1256                 bcopy(inp, &xi.xi_inp, sizeof *inp);
1257                 if (inp->inp_socket)
1258                         sotoxsocket(inp->inp_socket, &xi.xi_socket);
1259                 if ((error = SYSCTL_OUT(req, &xi, sizeof xi)) != 0)
1260                         break;
1261                 ++i;
1262         }
1263         LIST_REMOVE(marker, inp_list);
1264         if (error == 0 && i < n) {
1265                 bzero(&xi, sizeof xi);
1266                 xi.xi_len = sizeof xi;
1267                 while (i < n) {
1268                         error = SYSCTL_OUT(req, &xi, sizeof xi);
1269                         ++i;
1270                 }
1271         }
1272         kfree(marker, M_TEMP);
1273         return(error);
1274 }