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 1.48 2008/11/08 03:38:23 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/priv.h>
  84 #include <sys/jail.h>
  85 #include <sys/kernel.h>
  86 #include <sys/sysctl.h>
  87 #include <sys/thread2.h>
  88
  89 #include <machine/limits.h>
  90
  91 #include <net/if.h>
  92 #include <net/if_types.h>
  93 #include <net/route.h>
  94
  95 #include <netinet/in.h>
  96 #include <netinet/in_pcb.h>
  97 #include <netinet/in_var.h>
  98 #include <netinet/ip_var.h>
  99 #ifdef INET6
 100 #include <netinet/ip6.h>
 101 #include <netinet6/ip6_var.h>
 102 #endif /* INET6 */
 103
 104 #ifdef IPSEC
 105 #include <netinet6/ipsec.h>
 106 #include <netproto/key/key.h>
 107 #endif
 108
 109 #ifdef FAST_IPSEC
 110 #if defined(IPSEC) || defined(IPSEC_ESP)
 111 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
 112 #endif
 113
 114 #include <netproto/ipsec/ipsec.h>
 115 #include <netproto/ipsec/key.h>
 116 #define IPSEC
 117 #endif /* FAST_IPSEC */
 118
 119 struct in_addr zeroin_addr;
 120
 121 /*
 122  * These configure the range of local port addresses assigned to
 123  * "unspecified" outgoing connections/packets/whatever.
 124  */
 125 int ipport_lowfirstauto = IPPORT_RESERVED - 1;  /* 1023 */
 126 int ipport_lowlastauto = IPPORT_RESERVEDSTART;  /* 600 */
 127
 128 int ipport_firstauto = IPPORT_RESERVED;         /* 1024 */
 129 int ipport_lastauto = IPPORT_USERRESERVED;      /* 5000 */
 130
 131 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO;    /* 49152 */
 132 int ipport_hilastauto = IPPORT_HILASTAUTO;      /* 65535 */
 133
 134 #define RANGECHK(var, min, max) \
 135         if ((var) < (min)) { (var) = (min); } \
 136         else if ((var) > (max)) { (var) = (max); }
 137
 138 static int
 139 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 140 {
 141         int error;
 142
 143         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 144         if (!error) {
 145                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 146                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 147
 148                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
 149                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
 150
 151                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
 152                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
 153         }
 154         return (error);
 155 }
 156
 157 #undef RANGECHK
 158
 159 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 160
 161 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
 162            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
 163 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
 164            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
 165 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
 166            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
 167 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
 168            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
 169 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
 170            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
 171 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
 172            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
 173
 174 /*
 175  * in_pcb.c: manage the Protocol Control Blocks.
 176  *
 177  * NOTE: It is assumed that most of these functions will be called from
 178  * a critical section.  XXX - There are, unfortunately, a few exceptions
 179  * to this rule that should be fixed.
 180  *
 181  * NOTE: The caller should initialize the cpu field to the cpu running the
 182  * protocol stack associated with this inpcbinfo.
 183  */
 184
 185 void
 186 in_pcbinfo_init(struct inpcbinfo *pcbinfo)
 187 {
 188         LIST_INIT(&pcbinfo->pcblisthead);
 189         pcbinfo->cpu = -1;
 190 }
 191
 192 /*
 193  * Allocate a PCB and associate it with the socket.
 194  */
 195 int
 196 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 197 {
 198         struct inpcb *inp;
 199 #ifdef IPSEC
 200         int error;
 201 #endif
 202
 203         inp = kmalloc(pcbinfo->ipi_size, M_PCB, M_WAITOK|M_ZERO);
 204         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 205         inp->inp_pcbinfo = inp->inp_cpcbinfo = pcbinfo;
 206         inp->inp_socket = so;
 207 #ifdef IPSEC
 208         error = ipsec_init_policy(so, &inp->inp_sp);
 209         if (error != 0) {
 210                 kfree(inp, M_PCB);
 211                 return (error);
 212         }
 213 #endif
 214 #ifdef INET6
 215         if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only)
 216                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
 217         if (ip6_auto_flowlabel)
 218                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 219 #endif
 220         so->so_pcb = inp;
 221         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
 222         pcbinfo->ipi_count++;
 223         return (0);
 224 }
 225
 226 int
 227 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 228 {
 229         struct socket *so = inp->inp_socket;
 230         struct proc *p = td->td_proc;
 231         unsigned short *lastport;
 232         struct sockaddr_in *sin;
 233         struct sockaddr_in jsin;
 234         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 235         struct ucred *cred = NULL;
 236         u_short lport = 0;
 237         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 238         int error;
 239
 240         KKASSERT(p);
 241
 242         if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) /* XXX broken! */
 243                 return (EADDRNOTAVAIL);
 244         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 245                 return (EINVAL);        /* already bound */
 246         if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT)))
 247                 wild = 1;    /* neither SO_REUSEADDR nor SO_REUSEPORT is set */
 248         if (p)
 249                 cred = p->p_ucred;
 250         if (nam != NULL) {
 251                 sin = (struct sockaddr_in *)nam;
 252                 if (nam->sa_len != sizeof *sin)
 253                         return (EINVAL);
 254 #ifdef notdef
 255                 /*
 256                  * We should check the family, but old programs
 257                  * incorrectly fail to initialize it.
 258                  */
 259                 if (sin->sin_family != AF_INET)
 260                         return (EAFNOSUPPORT);
 261 #endif
 262                 if (!prison_replace_wildcards(td, nam))
 263                                 return (EINVAL);
 264                 lport = sin->sin_port;
 265                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 266                         /*
 267                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 268                          * allow complete duplication of binding if
 269                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 270                          * and a multicast address is bound on both
 271                          * new and duplicated sockets.
 272                          */
 273                         if (so->so_options & SO_REUSEADDR)
 274                                 reuseport = SO_REUSEADDR | SO_REUSEPORT;
 275                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 276                         sin->sin_port = 0;              /* yech... */
 277                         bzero(&sin->sin_zero, sizeof sin->sin_zero);
 278                         if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL)
 279                                 return (EADDRNOTAVAIL);
 280                 }
 281                 if (lport != 0) {
 282                         struct inpcb *t;
 283
 284                         /* GROSS */
 285                         if (ntohs(lport) < IPPORT_RESERVED &&
 286                             cred && priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))
 287                                 return (EACCES);
 288                         if (so->so_cred->cr_uid != 0 &&
 289                             !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 290                                 t = in_pcblookup_local(inp->inp_pcbinfo,
 291                                     sin->sin_addr, lport,
 292                                     INPLOOKUP_WILDCARD, cred);
 293                                 if (t &&
 294                                     (!in_nullhost(sin->sin_addr) ||
 295                                      !in_nullhost(t->inp_laddr) ||
 296                                      (t->inp_socket->so_options &
 297                                          SO_REUSEPORT) == 0) &&
 298                                     (so->so_cred->cr_uid !=
 299                                      t->inp_socket->so_cred->cr_uid)) {
 300 #ifdef INET6
 301                                         if (!in_nullhost(sin->sin_addr) ||
 302                                             !in_nullhost(t->inp_laddr) ||
 303                                             INP_SOCKAF(so) ==
 304                                             INP_SOCKAF(t->inp_socket))
 305 #endif
 306                                         return (EADDRINUSE);
 307                                 }
 308                         }
 309                         if (cred && !prison_replace_wildcards(td, nam))
 310                                 return (EADDRNOTAVAIL);
 311                         t = in_pcblookup_local(pcbinfo, sin->sin_addr, lport,
 312                                                wild, cred);
 313                         if (t && !(reuseport & t->inp_socket->so_options)) {
 314 #ifdef INET6
 315                                 if (!in_nullhost(sin->sin_addr) ||
 316                                     !in_nullhost(t->inp_laddr) ||
 317                                     INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
 318 #endif
 319                                 return (EADDRINUSE);
 320                         }
 321                 }
 322                 inp->inp_laddr = sin->sin_addr;
 323         }
 324         if (lport == 0) {
 325                 ushort first, last;
 326                 int count;
 327
 328                 jsin.sin_family = AF_INET;
 329                 jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 330                 if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
 331                         inp->inp_laddr.s_addr = INADDR_ANY;
 332                         return (EINVAL);
 333                 }
 334                 inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 335
 336                 inp->inp_flags |= INP_ANONPORT;
 337
 338                 if (inp->inp_flags & INP_HIGHPORT) {
 339                         first = ipport_hifirstauto;     /* sysctl */
 340                         last  = ipport_hilastauto;
 341                         lastport = &pcbinfo->lasthi;
 342                 } else if (inp->inp_flags & INP_LOWPORT) {
 343                         if (cred &&
 344                             (error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))) {
 345                                 inp->inp_laddr.s_addr = INADDR_ANY;
 346                                 return (error);
 347                         }
 348                         first = ipport_lowfirstauto;    /* 1023 */
 349                         last  = ipport_lowlastauto;     /* 600 */
 350                         lastport = &pcbinfo->lastlow;
 351                 } else {
 352                         first = ipport_firstauto;       /* sysctl */
 353                         last  = ipport_lastauto;
 354                         lastport = &pcbinfo->lastport;
 355                 }
 356                 /*
 357                  * Simple check to ensure all ports are not used up causing
 358                  * a deadlock here.
 359                  *
 360                  * We split the two cases (up and down) so that the direction
 361                  * is not being tested on each round of the loop.
 362                  */
 363                 if (first > last) {
 364                         /*
 365                          * counting down
 366                          */
 367                         count = first - last;
 368
 369                         do {
 370                                 if (count-- < 0) {      /* completely used? */
 371                                         inp->inp_laddr.s_addr = INADDR_ANY;
 372                                         return (EADDRNOTAVAIL);
 373                                 }
 374                                 --*lastport;
 375                                 if (*lastport > first || *lastport < last)
 376                                         *lastport = first;
 377                                 lport = htons(*lastport);
 378                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
 379                                  lport, wild, cred));
 380                 } else {
 381                         /*
 382                          * counting up
 383                          */
 384                         count = last - first;
 385
 386                         do {
 387                                 if (count-- < 0) {      /* completely used? */
 388                                         inp->inp_laddr.s_addr = INADDR_ANY;
 389                                         return (EADDRNOTAVAIL);
 390                                 }
 391                                 ++*lastport;
 392                                 if (*lastport < first || *lastport > last)
 393                                         *lastport = first;
 394                                 lport = htons(*lastport);
 395                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
 396                                  lport, wild, cred));
 397                 }
 398         }
 399         inp->inp_lport = lport;
 400
 401         jsin.sin_family = AF_INET;
 402         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 403         if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin)) {
 404                 inp->inp_laddr.s_addr = INADDR_ANY;
 405                 inp->inp_lport = 0;
 406                 return (EINVAL);
 407         }
 408         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 409
 410         if (in_pcbinsporthash(inp) != 0) {
 411                 inp->inp_laddr.s_addr = INADDR_ANY;
 412                 inp->inp_lport = 0;
 413                 return (EAGAIN);
 414         }
 415         return (0);
 416 }
 417
 418 /*
 419  *   Transform old in_pcbconnect() into an inner subroutine for new
 420  *   in_pcbconnect(): Do some validity-checking on the remote
 421  *   address (in mbuf 'nam') and then determine local host address
 422  *   (i.e., which interface) to use to access that remote host.
 423  *
 424  *   This preserves definition of in_pcbconnect(), while supporting a
 425  *   slightly different version for T/TCP.  (This is more than
 426  *   a bit of a kludge, but cleaning up the internal interfaces would
 427  *   have forced minor changes in every protocol).
 428  */
 429 int
 430 in_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 431         struct sockaddr_in **plocal_sin, struct thread *td)
 432 {
 433         struct in_ifaddr *ia;
 434         struct ucred *cred = NULL;
 435         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 436         struct sockaddr *jsin;
 437         int jailed = 0, alloc_route = 0;
 438
 439         if (nam->sa_len != sizeof *sin)
 440                 return (EINVAL);
 441         if (sin->sin_family != AF_INET)
 442                 return (EAFNOSUPPORT);
 443         if (sin->sin_port == 0)
 444                 return (EADDRNOTAVAIL);
 445         if (td && td->td_proc && td->td_proc->p_ucred)
 446                 cred = td->td_proc->p_ucred;
 447         if (cred && cred->cr_prison)
 448                 jailed = 1;
 449         if (!TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) {
 450                 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
 451                 /*
 452                  * If the destination address is INADDR_ANY,
 453                  * use the primary local address.
 454                  * If the supplied address is INADDR_BROADCAST,
 455                  * and the primary interface supports broadcast,
 456                  * choose the broadcast address for that interface.
 457                  */
 458                 if (sin->sin_addr.s_addr == INADDR_ANY)
 459                         sin->sin_addr = IA_SIN(ia)->sin_addr;
 460                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
 461                     (ia->ia_ifp->if_flags & IFF_BROADCAST))
 462                         sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
 463         }
 464         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 465                 struct route *ro;
 466
 467                 ia = NULL;
 468                 /*
 469                  * If route is known or can be allocated now,
 470                  * our src addr is taken from the i/f, else punt.
 471                  * Note that we should check the address family of the cached
 472                  * destination, in case of sharing the cache with IPv6.
 473                  */
 474                 ro = &inp->inp_route;
 475                 if (ro->ro_rt &&
 476                     (!(ro->ro_rt->rt_flags & RTF_UP) ||
 477                      ro->ro_dst.sa_family != AF_INET ||
 478                      satosin(&ro->ro_dst)->sin_addr.s_addr !=
 479                                       sin->sin_addr.s_addr ||
 480                      inp->inp_socket->so_options & SO_DONTROUTE)) {
 481                         RTFREE(ro->ro_rt);
 482                         ro->ro_rt = NULL;
 483                 }
 484                 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 485                     (ro->ro_rt == NULL ||
 486                     ro->ro_rt->rt_ifp == NULL)) {
 487                         /* No route yet, so try to acquire one */
 488                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 489                         ro->ro_dst.sa_family = AF_INET;
 490                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 491                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
 492                                 sin->sin_addr;
 493                         rtalloc(ro);
 494                         alloc_route = 1;
 495                 }
 496                 /*
 497                  * If we found a route, use the address
 498                  * corresponding to the outgoing interface
 499                  * unless it is the loopback (in case a route
 500                  * to our address on another net goes to loopback).
 501                  */
 502                 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) {
 503                         if (jailed) {
 504                                 if (jailed_ip(cred->cr_prison,
 505                                     ro->ro_rt->rt_ifa->ifa_addr)) {
 506                                         ia = ifatoia(ro->ro_rt->rt_ifa);
 507                                 }
 508                         } else {
 509                                 ia = ifatoia(ro->ro_rt->rt_ifa);
 510                         }
 511                 }
 512                 if (ia == NULL) {
 513                         u_short fport = sin->sin_port;
 514
 515                         sin->sin_port = 0;
 516                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
 517                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 518                             sintosa(&ia->ia_addr)))
 519                                 ia = NULL;
 520                         if (ia == NULL)
 521                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
 522                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 523                             sintosa(&ia->ia_addr)))
 524                                 ia = NULL;
 525                         sin->sin_port = fport;
 526                         if (ia == NULL &&
 527                             !TAILQ_EMPTY(&in_ifaddrheads[mycpuid]))
 528                                 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
 529                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 530                             sintosa(&ia->ia_addr)))
 531                                 ia = NULL;
 532
 533                         if (!jailed && ia == NULL)
 534                                 goto fail;
 535                 }
 536                 /*
 537                  * If the destination address is multicast and an outgoing
 538                  * interface has been set as a multicast option, use the
 539                  * address of that interface as our source address.
 540                  */
 541                 if (!jailed && IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 542                     inp->inp_moptions != NULL) {
 543                         struct ip_moptions *imo;
 544                         struct ifnet *ifp;
 545
 546                         imo = inp->inp_moptions;
 547                         if (imo->imo_multicast_ifp != NULL) {
 548                                 struct in_ifaddr_container *iac;
 549
 550                                 ifp = imo->imo_multicast_ifp;
 551                                 ia = NULL;
 552                                 TAILQ_FOREACH(iac,
 553                                 &in_ifaddrheads[mycpuid], ia_link) {
 554                                         if (iac->ia->ia_ifp == ifp) {
 555                                                 ia = iac->ia;
 556                                                 break;
 557                                         }
 558                                 }
 559                                 if (ia == NULL)
 560                                         goto fail;
 561                         }
 562                 }
 563                 /*
 564                  * Don't do pcblookup call here; return interface in plocal_sin
 565                  * and exit to caller, that will do the lookup.
 566                  */
 567                 if (ia == NULL && jailed) {
 568                         if ((jsin = prison_get_nonlocal(cred->cr_prison, AF_INET, NULL)) != NULL ||
 569                             (jsin = prison_get_local(cred->cr_prison, AF_INET, NULL)) != NULL) {
 570                                 *plocal_sin = satosin(jsin);
 571                         } else {
 572                                 /* IPv6 only Jail */
 573                                 goto fail;
 574                         }
 575                 } else {
 576                         *plocal_sin = &ia->ia_addr;
 577                 }
 578         }
 579         return (0);
 580 fail:
 581         if (alloc_route) {
 582                 struct route *ro = &inp->inp_route;
 583
 584                 if (ro->ro_rt != NULL)
 585                         RTFREE(ro->ro_rt);
 586                 bzero(ro, sizeof(*ro));
 587         }
 588         return (EADDRNOTAVAIL);
 589 }
 590
 591 /*
 592  * Outer subroutine:
 593  * Connect from a socket to a specified address.
 594  * Both address and port must be specified in argument sin.
 595  * If don't have a local address for this socket yet,
 596  * then pick one.
 597  */
 598 int
 599 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 600 {
 601         struct sockaddr_in *if_sin;
 602         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 603         int error;
 604
 605         /* Call inner routine to assign local interface address. */
 606         if ((error = in_pcbladdr(inp, nam, &if_sin, td)) != 0)
 607                 return (error);
 608
 609         if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port,
 610             inp->inp_laddr.s_addr ? inp->inp_laddr : if_sin->sin_addr,
 611             inp->inp_lport, FALSE, NULL) != NULL) {
 612                 return (EADDRINUSE);
 613         }
 614         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 615                 if (inp->inp_lport == 0) {
 616                         error = in_pcbbind(inp, NULL, td);
 617                         if (error)
 618                                 return (error);
 619                 }
 620                 inp->inp_laddr = if_sin->sin_addr;
 621         }
 622         inp->inp_faddr = sin->sin_addr;
 623         inp->inp_fport = sin->sin_port;
 624         in_pcbinsconnhash(inp);
 625         return (0);
 626 }
 627
 628 void
 629 in_pcbdisconnect(struct inpcb *inp)
 630 {
 631
 632         inp->inp_faddr.s_addr = INADDR_ANY;
 633         inp->inp_fport = 0;
 634         in_pcbremconnhash(inp);
 635         if (inp->inp_socket->so_state & SS_NOFDREF)
 636                 in_pcbdetach(inp);
 637 }
 638
 639 void
 640 in_pcbdetach(struct inpcb *inp)
 641 {
 642         struct socket *so = inp->inp_socket;
 643         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 644
 645 #ifdef IPSEC
 646         ipsec4_delete_pcbpolicy(inp);
 647 #endif /*IPSEC*/
 648         inp->inp_gencnt = ++ipi->ipi_gencnt;
 649         in_pcbremlists(inp);
 650         so->so_pcb = NULL;
 651         sofree(so);
 652         if (inp->inp_options)
 653                 m_free(inp->inp_options);
 654         if (inp->inp_route.ro_rt)
 655                 rtfree(inp->inp_route.ro_rt);
 656         ip_freemoptions(inp->inp_moptions);
 657         inp->inp_vflag = 0;
 658         kfree(inp, M_PCB);
 659 }
 660
 661 /*
 662  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
 663  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 664  * in struct pr_usrreqs, so that protocols can just reference then directly
 665  * without the need for a wrapper function.  The socket must have a valid
 666  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 667  * except through a kernel programming error, so it is acceptable to panic
 668  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 669  * because there actually /is/ a programming error somewhere... XXX)
 670  */
 671 int
 672 in_setsockaddr(struct socket *so, struct sockaddr **nam)
 673 {
 674         struct inpcb *inp;
 675         struct sockaddr_in *sin;
 676
 677         /*
 678          * Do the malloc first in case it blocks.
 679          */
 680         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 681                 M_WAITOK | M_ZERO);
 682         sin->sin_family = AF_INET;
 683         sin->sin_len = sizeof *sin;
 684
 685         crit_enter();
 686         inp = so->so_pcb;
 687         if (!inp) {
 688                 crit_exit();
 689                 kfree(sin, M_SONAME);
 690                 return (ECONNRESET);
 691         }
 692         sin->sin_port = inp->inp_lport;
 693         sin->sin_addr = inp->inp_laddr;
 694         crit_exit();
 695
 696         *nam = (struct sockaddr *)sin;
 697         return (0);
 698 }
 699
 700 int
 701 in_setpeeraddr(struct socket *so, struct sockaddr **nam)
 702 {
 703         struct inpcb *inp;
 704         struct sockaddr_in *sin;
 705
 706         /*
 707          * Do the malloc first in case it blocks.
 708          */
 709         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 710                 M_WAITOK | M_ZERO);
 711         sin->sin_family = AF_INET;
 712         sin->sin_len = sizeof *sin;
 713
 714         crit_enter();
 715         inp = so->so_pcb;
 716         if (!inp) {
 717                 crit_exit();
 718                 kfree(sin, M_SONAME);
 719                 return (ECONNRESET);
 720         }
 721         sin->sin_port = inp->inp_fport;
 722         sin->sin_addr = inp->inp_faddr;
 723         crit_exit();
 724
 725         *nam = (struct sockaddr *)sin;
 726         return (0);
 727 }
 728
 729 void
 730 in_pcbnotifyall(struct inpcbhead *head, struct in_addr faddr, int err,
 731                 void (*notify)(struct inpcb *, int))
 732 {
 733         struct inpcb *inp, *ninp;
 734
 735         /*
 736          * note: if INP_PLACEMARKER is set we must ignore the rest of
 737          * the structure and skip it.
 738          */
 739         crit_enter();
 740         LIST_FOREACH_MUTABLE(inp, head, inp_list, ninp) {
 741                 if (inp->inp_flags & INP_PLACEMARKER)
 742                         continue;
 743 #ifdef INET6
 744                 if (!(inp->inp_vflag & INP_IPV4))
 745                         continue;
 746 #endif
 747                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 748                     inp->inp_socket == NULL)
 749                         continue;
 750                 (*notify)(inp, err);            /* can remove inp from list! */
 751         }
 752         crit_exit();
 753 }
 754
 755 void
 756 in_pcbpurgeif0(struct inpcb *head, struct ifnet *ifp)
 757 {
 758         struct inpcb *inp;
 759         struct ip_moptions *imo;
 760         int i, gap;
 761
 762         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
 763                 if (inp->inp_flags & INP_PLACEMARKER)
 764                         continue;
 765                 imo = inp->inp_moptions;
 766                 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) {
 767                         /*
 768                          * Unselect the outgoing interface if it is being
 769                          * detached.
 770                          */
 771                         if (imo->imo_multicast_ifp == ifp)
 772                                 imo->imo_multicast_ifp = NULL;
 773
 774                         /*
 775                          * Drop multicast group membership if we joined
 776                          * through the interface being detached.
 777                          */
 778                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 779                             i++) {
 780                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 781                                         in_delmulti(imo->imo_membership[i]);
 782                                         gap++;
 783                                 } else if (gap != 0)
 784                                         imo->imo_membership[i - gap] =
 785                                             imo->imo_membership[i];
 786                         }
 787                         imo->imo_num_memberships -= gap;
 788                 }
 789         }
 790 }
 791
 792 /*
 793  * Check for alternatives when higher level complains
 794  * about service problems.  For now, invalidate cached
 795  * routing information.  If the route was created dynamically
 796  * (by a redirect), time to try a default gateway again.
 797  */
 798 void
 799 in_losing(struct inpcb *inp)
 800 {
 801         struct rtentry *rt;
 802         struct rt_addrinfo rtinfo;
 803
 804         if ((rt = inp->inp_route.ro_rt)) {
 805                 bzero(&rtinfo, sizeof(struct rt_addrinfo));
 806                 rtinfo.rti_info[RTAX_DST] = rt_key(rt);
 807                 rtinfo.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 808                 rtinfo.rti_info[RTAX_NETMASK] = rt_mask(rt);
 809                 rtinfo.rti_flags = rt->rt_flags;
 810                 rt_missmsg(RTM_LOSING, &rtinfo, rt->rt_flags, 0);
 811                 if (rt->rt_flags & RTF_DYNAMIC)
 812                         rtrequest1_global(RTM_DELETE, &rtinfo, NULL, NULL);
 813                 inp->inp_route.ro_rt = NULL;
 814                 rtfree(rt);
 815                 /*
 816                  * A new route can be allocated
 817                  * the next time output is attempted.
 818                  */
 819         }
 820 }
 821
 822 /*
 823  * After a routing change, flush old routing
 824  * and allocate a (hopefully) better one.
 825  */
 826 void
 827 in_rtchange(struct inpcb *inp, int err)
 828 {
 829         if (inp->inp_route.ro_rt) {
 830                 rtfree(inp->inp_route.ro_rt);
 831                 inp->inp_route.ro_rt = NULL;
 832                 /*
 833                  * A new route can be allocated the next time
 834                  * output is attempted.
 835                  */
 836         }
 837 }
 838
 839 /*
 840  * Lookup a PCB based on the local address and port.
 841  */
 842 struct inpcb *
 843 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 844                    u_int lport_arg, int wild_okay, struct ucred *cred)
 845 {
 846         struct inpcb *inp;
 847         int matchwild = 3, wildcard;
 848         u_short lport = lport_arg;
 849
 850         struct inpcbporthead *porthash;
 851         struct inpcbport *phd;
 852         struct inpcb *match = NULL;
 853
 854         /*
 855          * Best fit PCB lookup.
 856          *
 857          * First see if this local port is in use by looking on the
 858          * port hash list.
 859          */
 860         porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 861             pcbinfo->porthashmask)];
 862         LIST_FOREACH(phd, porthash, phd_hash) {
 863                 if (phd->phd_port == lport)
 864                         break;
 865         }
 866         if (phd != NULL) {
 867                 /*
 868                  * Port is in use by one or more PCBs. Look for best
 869                  * fit.
 870                  */
 871                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 872                         wildcard = 0;
 873 #ifdef INET6
 874                         if ((inp->inp_vflag & INP_IPV4) == 0)
 875                                 continue;
 876 #endif
 877                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 878                                 wildcard++;
 879                         if (inp->inp_laddr.s_addr != INADDR_ANY) {
 880                                 if (laddr.s_addr == INADDR_ANY)
 881                                         wildcard++;
 882                                 else if (inp->inp_laddr.s_addr != laddr.s_addr)
 883                                         continue;
 884                         } else {
 885                                 if (laddr.s_addr != INADDR_ANY)
 886                                         wildcard++;
 887                         }
 888                         if (wildcard && !wild_okay)
 889                                 continue;
 890                         if (wildcard < matchwild &&
 891                             (cred == NULL ||
 892                              cred->cr_prison ==
 893                                         inp->inp_socket->so_cred->cr_prison)) {
 894                                 match = inp;
 895                                 matchwild = wildcard;
 896                                 if (matchwild == 0) {
 897                                         break;
 898                                 }
 899                         }
 900                 }
 901         }
 902         return (match);
 903 }
 904
 905 /*
 906  * Lookup PCB in hash list.
 907  */
 908 struct inpcb *
 909 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport_arg,
 910                   struct in_addr laddr, u_int lport_arg, boolean_t wildcard,
 911                   struct ifnet *ifp)
 912 {
 913         struct inpcbhead *head;
 914         struct inpcb *inp, *jinp=NULL;
 915         u_short fport = fport_arg, lport = lport_arg;
 916
 917         /*
 918          * First look for an exact match.
 919          */
 920         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport,
 921             laddr.s_addr, lport, pcbinfo->hashmask)];
 922         LIST_FOREACH(inp, head, inp_hash) {
 923 #ifdef INET6
 924                 if (!(inp->inp_vflag & INP_IPV4))
 925                         continue;
 926 #endif
 927                 if (in_hosteq(inp->inp_faddr, faddr) &&
 928                     in_hosteq(inp->inp_laddr, laddr) &&
 929                     inp->inp_fport == fport && inp->inp_lport == lport) {
 930                         /* found */
 931                         if (inp->inp_socket == NULL ||
 932                             inp->inp_socket->so_cred->cr_prison == NULL) {
 933                                 return (inp);
 934                         } else {
 935                                 if  (jinp == NULL)
 936                                         jinp = inp;
 937                         }
 938                 }
 939         }
 940         if (jinp != NULL)
 941                 return (jinp);
 942         if (wildcard) {
 943                 struct inpcb *local_wild = NULL;
 944                 struct inpcb *jinp_wild = NULL;
 945 #ifdef INET6
 946                 struct inpcb *local_wild_mapped = NULL;
 947 #endif
 948                 struct inpcontainer *ic;
 949                 struct inpcontainerhead *chead;
 950                 struct sockaddr_in jsin;
 951                 struct ucred *cred;
 952
 953                 /*
 954                  * Order of socket selection:
 955                  * 1. non-jailed, non-wild.
 956                  * 2. non-jailed, wild.
 957                  * 3. jailed, non-wild.
 958                  * 4. jailed, wild.
 959                  */
 960                 jsin.sin_family = AF_INET;
 961                 chead = &pcbinfo->wildcardhashbase[
 962                     INP_PCBWILDCARDHASH(lport, pcbinfo->wildcardhashmask)];
 963                 LIST_FOREACH(ic, chead, ic_list) {
 964                         inp = ic->ic_inp;
 965                         jsin.sin_addr.s_addr = laddr.s_addr;
 966 #ifdef INET6
 967                         if (!(inp->inp_vflag & INP_IPV4))
 968                                 continue;
 969 #endif
 970                         if (inp->inp_socket != NULL)
 971                                 cred = inp->inp_socket->so_cred;
 972                         else
 973                                 cred = NULL;
 974                         if (cred != NULL && jailed(cred)) {
 975                                 if (jinp != NULL)
 976                                         continue;
 977                                 else
 978                                         if (!jailed_ip(cred->cr_prison,
 979                                             (struct sockaddr *)&jsin))
 980                                                 continue;
 981                         }
 982                         if (inp->inp_lport == lport) {
 983                                 if (ifp && ifp->if_type == IFT_FAITH &&
 984                                     !(inp->inp_flags & INP_FAITH))
 985                                         continue;
 986                                 if (inp->inp_laddr.s_addr == laddr.s_addr) {
 987                                         if (cred != NULL && jailed(cred))
 988                                                 jinp = inp;
 989                                         else
 990                                                 return (inp);
 991                                 }
 992                                 if (inp->inp_laddr.s_addr == INADDR_ANY) {
 993 #ifdef INET6
 994                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
 995                                                              AF_INET6))
 996                                                 local_wild_mapped = inp;
 997                                         else
 998 #endif
 999                                                 if (cred != NULL &&
1000                                                     jailed(cred))
1001                                                         jinp_wild = inp;
1002                                                 else
1003                                                         local_wild = inp;
1004                                 }
1005                         }
1006                 }
1007                 if (local_wild != NULL)
1008                         return (local_wild);
1009 #ifdef INET6
1010                 if (local_wild_mapped != NULL)
1011                         return (local_wild_mapped);
1012 #endif
1013                 if (jinp != NULL)
1014                         return (jinp);
1015                 return (jinp_wild);
1016         }
1017
1018         /*
1019          * Not found.
1020          */
1021         return (NULL);
1022 }
1023
1024 /*
1025  * Insert PCB into connection hash table.
1026  */
1027 void
1028 in_pcbinsconnhash(struct inpcb *inp)
1029 {
1030         struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo;
1031         struct inpcbhead *bucket;
1032         u_int32_t hashkey_faddr, hashkey_laddr;
1033
1034 #ifdef INET6
1035         if (inp->inp_vflag & INP_IPV6) {
1036                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */;
1037                 hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */;
1038         } else {
1039 #endif
1040                 hashkey_faddr = inp->inp_faddr.s_addr;
1041                 hashkey_laddr = inp->inp_laddr.s_addr;
1042 #ifdef INET6
1043         }
1044 #endif
1045
1046         KASSERT(!(inp->inp_flags & INP_CONNECTED), ("already on hash list"));
1047         inp->inp_flags |= INP_CONNECTED;
1048
1049         /*
1050          * Insert into the connection hash table.
1051          */
1052         bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr,
1053             inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)];
1054         LIST_INSERT_HEAD(bucket, inp, inp_hash);
1055 }
1056
1057 /*
1058  * Remove PCB from connection hash table.
1059  */
1060 void
1061 in_pcbremconnhash(struct inpcb *inp)
1062 {
1063         KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected"));
1064         LIST_REMOVE(inp, inp_hash);
1065         inp->inp_flags &= ~INP_CONNECTED;
1066 }
1067
1068 /*
1069  * Insert PCB into port hash table.
1070  */
1071 int
1072 in_pcbinsporthash(struct inpcb *inp)
1073 {
1074         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1075         struct inpcbporthead *pcbporthash;
1076         struct inpcbport *phd;
1077
1078         /*
1079          * Insert into the port hash table.
1080          */
1081         pcbporthash = &pcbinfo->porthashbase[
1082             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->porthashmask)];
1083
1084         /* Go through port list and look for a head for this lport. */
1085         LIST_FOREACH(phd, pcbporthash, phd_hash)
1086                 if (phd->phd_port == inp->inp_lport)
1087                         break;
1088
1089         /* If none exists, malloc one and tack it on. */
1090         if (phd == NULL) {
1091                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport),
1092                     M_PCB, M_INTWAIT | M_NULLOK);
1093                 if (phd == NULL)
1094                         return (ENOBUFS); /* XXX */
1095                 phd->phd_port = inp->inp_lport;
1096                 LIST_INIT(&phd->phd_pcblist);
1097                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1098         }
1099
1100         inp->inp_phd = phd;
1101         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1102
1103         return (0);
1104 }
1105
1106 void
1107 in_pcbinswildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1108 {
1109         struct inpcontainer *ic;
1110         struct inpcontainerhead *bucket;
1111
1112         bucket = &pcbinfo->wildcardhashbase[
1113             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1114
1115         ic = kmalloc(sizeof(struct inpcontainer), M_TEMP, M_INTWAIT);
1116         ic->ic_inp = inp;
1117         LIST_INSERT_HEAD(bucket, ic, ic_list);
1118 }
1119
1120 /*
1121  * Insert PCB into wildcard hash table.
1122  */
1123 void
1124 in_pcbinswildcardhash(struct inpcb *inp)
1125 {
1126         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1127
1128         KKASSERT(pcbinfo != NULL);
1129
1130         in_pcbinswildcardhash_oncpu(inp, pcbinfo);
1131         inp->inp_flags |= INP_WILDCARD;
1132 }
1133
1134 void
1135 in_pcbremwildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1136 {
1137         struct inpcontainer *ic;
1138         struct inpcontainerhead *head;
1139
1140         /* find bucket */
1141         head = &pcbinfo->wildcardhashbase[
1142             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1143
1144         LIST_FOREACH(ic, head, ic_list) {
1145                 if (ic->ic_inp == inp)
1146                         goto found;
1147         }
1148         return;                 /* not found! */
1149
1150 found:
1151         LIST_REMOVE(ic, ic_list);       /* remove container from bucket chain */
1152         kfree(ic, M_TEMP);              /* deallocate container */
1153 }
1154
1155 /*
1156  * Remove PCB from wildcard hash table.
1157  */
1158 void
1159 in_pcbremwildcardhash(struct inpcb *inp)
1160 {
1161         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1162
1163         KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard"));
1164         in_pcbremwildcardhash_oncpu(inp, pcbinfo);
1165         inp->inp_flags &= ~INP_WILDCARD;
1166 }
1167
1168 /*
1169  * Remove PCB from various lists.
1170  */
1171 void
1172 in_pcbremlists(struct inpcb *inp)
1173 {
1174         if (inp->inp_lport) {
1175                 struct inpcbport *phd = inp->inp_phd;
1176
1177                 LIST_REMOVE(inp, inp_portlist);
1178                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1179                         LIST_REMOVE(phd, phd_hash);
1180                         kfree(phd, M_PCB);
1181                 }
1182         }
1183         if (inp->inp_flags & INP_WILDCARD) {
1184                 in_pcbremwildcardhash(inp);
1185         } else if (inp->inp_flags & INP_CONNECTED) {
1186                 in_pcbremconnhash(inp);
1187         }
1188         LIST_REMOVE(inp, inp_list);
1189         inp->inp_pcbinfo->ipi_count--;
1190 }
1191
1192 int
1193 prison_xinpcb(struct thread *td, struct inpcb *inp)
1194 {
1195         struct ucred *cr;
1196
1197         if (td->td_proc == NULL)
1198                 return (0);
1199         cr = td->td_proc->p_ucred;
1200         if (cr->cr_prison == NULL)
1201                 return (0);
1202         if (inp->inp_socket && inp->inp_socket->so_cred &&
1203             inp->inp_socket->so_cred->cr_prison &&
1204             cr->cr_prison == inp->inp_socket->so_cred->cr_prison)
1205                 return (0);
1206         return (1);
1207 }
1208
1209 int
1210 in_pcblist_global(SYSCTL_HANDLER_ARGS)
1211 {
1212         struct inpcbinfo *pcbinfo = arg1;
1213         struct inpcb *inp, *marker;
1214         struct xinpcb xi;
1215         int error, i, n;
1216         inp_gen_t gencnt;
1217
1218         /*
1219          * The process of preparing the TCB list is too time-consuming and
1220          * resource-intensive to repeat twice on every request.
1221          */
1222         if (req->oldptr == NULL) {
1223                 n = pcbinfo->ipi_count;
1224                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1225                 return 0;
1226         }
1227
1228         if (req->newptr != NULL)
1229                 return EPERM;
1230
1231         /*
1232          * OK, now we're committed to doing something.  Re-fetch ipi_count
1233          * after obtaining the generation count.
1234          */
1235         gencnt = pcbinfo->ipi_gencnt;
1236         n = pcbinfo->ipi_count;
1237
1238         marker = kmalloc(sizeof(struct inpcb), M_TEMP, M_WAITOK|M_ZERO);
1239         marker->inp_flags |= INP_PLACEMARKER;
1240         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
1241
1242         i = 0;
1243         error = 0;
1244
1245         while ((inp = LIST_NEXT(marker, inp_list)) != NULL && i < n) {
1246                 LIST_REMOVE(marker, inp_list);
1247                 LIST_INSERT_AFTER(inp, marker, inp_list);
1248
1249                 if (inp->inp_flags & INP_PLACEMARKER)
1250                         continue;
1251                 if (inp->inp_gencnt > gencnt)
1252                         continue;
1253                 if (prison_xinpcb(req->td, inp))
1254                         continue;
1255                 bzero(&xi, sizeof xi);
1256                 xi.xi_len = sizeof xi;
1257                 bcopy(inp, &xi.xi_inp, sizeof *inp);
1258                 if (inp->inp_socket)
1259                         sotoxsocket(inp->inp_socket, &xi.xi_socket);
1260                 if ((error = SYSCTL_OUT(req, &xi, sizeof xi)) != 0)
1261                         break;
1262                 ++i;
1263         }
1264         LIST_REMOVE(marker, inp_list);
1265         if (error == 0 && i < n) {
1266                 bzero(&xi, sizeof xi);
1267                 xi.xi_len = sizeof xi;
1268                 while (i < n) {
1269                         error = SYSCTL_OUT(req, &xi, sizeof xi);
1270                         ++i;
1271                 }
1272         }
1273         kfree(marker, M_TEMP);
1274         return(error);
1275 }