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) 2004 Jeffrey M. Hsu.  All rights reserved.
  36  *
  37  * License terms: all terms for the DragonFly license above plus the following:
  38  *
  39  * 4. All advertising materials mentioning features or use of this software
  40  *    must display the following acknowledgement:
  41  *
  42  *      This product includes software developed by Jeffrey M. Hsu
  43  *      for the DragonFly Project.
  44  *
  45  *    This requirement may be waived with permission from Jeffrey Hsu.
  46  *    This requirement will sunset and may be removed on July 8 2005,
  47  *    after which the standard DragonFly license (as shown above) will
  48  *    apply.
  49  */
  50
  51 /*
  52  * Copyright (c) 1982, 1986, 1991, 1993, 1995
  53  *      The Regents of the University of California.  All rights reserved.
  54  *
  55  * Redistribution and use in source and binary forms, with or without
  56  * modification, are permitted provided that the following conditions
  57  * are met:
  58  * 1. Redistributions of source code must retain the above copyright
  59  *    notice, this list of conditions and the following disclaimer.
  60  * 2. Redistributions in binary form must reproduce the above copyright
  61  *    notice, this list of conditions and the following disclaimer in the
  62  *    documentation and/or other materials provided with the distribution.
  63  * 3. All advertising materials mentioning features or use of this software
  64  *    must display the following acknowledgement:
  65  *      This product includes software developed by the University of
  66  *      California, Berkeley and its contributors.
  67  * 4. Neither the name of the University nor the names of its contributors
  68  *    may be used to endorse or promote products derived from this software
  69  *    without specific prior written permission.
  70  *
  71  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  72  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  73  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  74  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  75  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  76  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  77  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  78  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  79  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  80  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  81  * SUCH DAMAGE.
  82  *
  83  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
  84  * $FreeBSD: src/sys/netinet/in_pcb.c,v 1.59.2.27 2004/01/02 04:06:42 ambrisko Exp $
  85  * $DragonFly: src/sys/netinet/in_pcb.c,v 1.36 2005/06/02 23:52:42 dillon Exp $
  86  */
  87
  88 #include "opt_ipsec.h"
  89 #include "opt_inet6.h"
  90
  91 #include <sys/param.h>
  92 #include <sys/systm.h>
  93 #include <sys/malloc.h>
  94 #include <sys/mbuf.h>
  95 #include <sys/domain.h>
  96 #include <sys/protosw.h>
  97 #include <sys/socket.h>
  98 #include <sys/socketvar.h>
  99 #include <sys/proc.h>
 100 #include <sys/jail.h>
 101 #include <sys/kernel.h>
 102 #include <sys/sysctl.h>
 103 #include <sys/thread2.h>
 104
 105 #include <machine/limits.h>
 106
 107 #include <vm/vm_zone.h>
 108
 109 #include <net/if.h>
 110 #include <net/if_types.h>
 111 #include <net/route.h>
 112
 113 #include <netinet/in.h>
 114 #include <netinet/in_pcb.h>
 115 #include <netinet/in_var.h>
 116 #include <netinet/ip_var.h>
 117 #ifdef INET6
 118 #include <netinet/ip6.h>
 119 #include <netinet6/ip6_var.h>
 120 #endif /* INET6 */
 121
 122 #ifdef IPSEC
 123 #include <netinet6/ipsec.h>
 124 #include <netproto/key/key.h>
 125 #endif
 126
 127 #ifdef FAST_IPSEC
 128 #if defined(IPSEC) || defined(IPSEC_ESP)
 129 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
 130 #endif
 131
 132 #include <netproto/ipsec/ipsec.h>
 133 #include <netproto/ipsec/key.h>
 134 #define IPSEC
 135 #endif /* FAST_IPSEC */
 136
 137 struct in_addr zeroin_addr;
 138
 139 /*
 140  * These configure the range of local port addresses assigned to
 141  * "unspecified" outgoing connections/packets/whatever.
 142  */
 143 int ipport_lowfirstauto = IPPORT_RESERVED - 1;  /* 1023 */
 144 int ipport_lowlastauto = IPPORT_RESERVEDSTART;  /* 600 */
 145
 146 int ipport_firstauto = IPPORT_RESERVED;         /* 1024 */
 147 int ipport_lastauto = IPPORT_USERRESERVED;      /* 5000 */
 148
 149 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO;    /* 49152 */
 150 int ipport_hilastauto = IPPORT_HILASTAUTO;      /* 65535 */
 151
 152 static __inline void
 153 RANGECHK(int var, int min, int max)
 154 {
 155         if (var < min)
 156                 var = min;
 157         else if (var > max)
 158                 var = max;
 159 }
 160
 161 static int
 162 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 163 {
 164         int error;
 165
 166         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 167         if (!error) {
 168                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 169                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 170
 171                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
 172                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
 173
 174                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
 175                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
 176         }
 177         return (error);
 178 }
 179
 180 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 181
 182 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
 183            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
 184 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
 185            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
 186 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
 187            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
 188 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
 189            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
 190 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
 191            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
 192 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
 193            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
 194
 195 /*
 196  * in_pcb.c: manage the Protocol Control Blocks.
 197  *
 198  * NOTE: It is assumed that most of these functions will be called from
 199  * a critical section.  XXX - There are, unfortunately, a few exceptions
 200  * to this rule that should be fixed.
 201  *
 202  * NOTE: The caller should initialize the cpu field to the cpu running the
 203  * protocol stack associated with this inpcbinfo.
 204  */
 205
 206 void
 207 in_pcbinfo_init(struct inpcbinfo *pcbinfo)
 208 {
 209         LIST_INIT(&pcbinfo->pcblisthead);
 210         pcbinfo->cpu = -1;
 211 }
 212
 213 /*
 214  * Allocate a PCB and associate it with the socket.
 215  */
 216 int
 217 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 218 {
 219         struct inpcb *inp;
 220 #ifdef IPSEC
 221         int error;
 222 #endif
 223
 224         inp = zalloc(pcbinfo->ipi_zone);
 225         if (inp == NULL)
 226                 return (ENOBUFS);
 227         bzero(inp, sizeof *inp);
 228         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 229         inp->inp_pcbinfo = inp->inp_cpcbinfo = pcbinfo;
 230         inp->inp_socket = so;
 231 #ifdef IPSEC
 232         error = ipsec_init_policy(so, &inp->inp_sp);
 233         if (error != 0) {
 234                 zfree(pcbinfo->ipi_zone, inp);
 235                 return (error);
 236         }
 237 #endif
 238 #ifdef INET6
 239         if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only)
 240                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
 241         if (ip6_auto_flowlabel)
 242                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 243 #endif
 244         so->so_pcb = inp;
 245         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
 246         pcbinfo->ipi_count++;
 247         return (0);
 248 }
 249
 250 int
 251 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 252 {
 253         struct socket *so = inp->inp_socket;
 254         struct proc *p = td->td_proc;
 255         unsigned short *lastport;
 256         struct sockaddr_in *sin;
 257         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 258         u_short lport = 0;
 259         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 260         int error, prison = 0;
 261
 262         KKASSERT(p);
 263
 264         if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
 265                 return (EADDRNOTAVAIL);
 266         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 267                 return (EINVAL);        /* already bound */
 268         if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT)))
 269                 wild = 1;    /* neither SO_REUSEADDR nor SO_REUSEPORT is set */
 270         if (nam != NULL) {
 271                 sin = (struct sockaddr_in *)nam;
 272                 if (nam->sa_len != sizeof *sin)
 273                         return (EINVAL);
 274 #ifdef notdef
 275                 /*
 276                  * We should check the family, but old programs
 277                  * incorrectly fail to initialize it.
 278                  */
 279                 if (sin->sin_family != AF_INET)
 280                         return (EAFNOSUPPORT);
 281 #endif
 282                 if (sin->sin_addr.s_addr != INADDR_ANY &&
 283                     prison_ip(td, 0, &sin->sin_addr.s_addr))
 284                                 return (EINVAL);
 285                 lport = sin->sin_port;
 286                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 287                         /*
 288                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 289                          * allow complete duplication of binding if
 290                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 291                          * and a multicast address is bound on both
 292                          * new and duplicated sockets.
 293                          */
 294                         if (so->so_options & SO_REUSEADDR)
 295                                 reuseport = SO_REUSEADDR | SO_REUSEPORT;
 296                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 297                         sin->sin_port = 0;              /* yech... */
 298                         bzero(&sin->sin_zero, sizeof sin->sin_zero);
 299                         if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL)
 300                                 return (EADDRNOTAVAIL);
 301                 }
 302                 if (lport != 0) {
 303                         struct inpcb *t;
 304
 305                         /* GROSS */
 306                         if (ntohs(lport) < IPPORT_RESERVED &&
 307                             p && suser_cred(p->p_ucred, PRISON_ROOT))
 308                                 return (EACCES);
 309                         if (p && p->p_ucred->cr_prison)
 310                                 prison = 1;
 311                         if (so->so_cred->cr_uid != 0 &&
 312                             !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 313                                 t = in_pcblookup_local(inp->inp_pcbinfo,
 314                                     sin->sin_addr, lport,
 315                                     prison ? 0 : INPLOOKUP_WILDCARD);
 316                                 if (t &&
 317                                     (!in_nullhost(sin->sin_addr) ||
 318                                      !in_nullhost(t->inp_laddr) ||
 319                                      (t->inp_socket->so_options &
 320                                          SO_REUSEPORT) == 0) &&
 321                                     (so->so_cred->cr_uid !=
 322                                      t->inp_socket->so_cred->cr_uid)) {
 323 #ifdef INET6
 324                                         if (!in_nullhost(sin->sin_addr) ||
 325                                             !in_nullhost(t->inp_laddr) ||
 326                                             INP_SOCKAF(so) ==
 327                                             INP_SOCKAF(t->inp_socket))
 328 #endif
 329                                         return (EADDRINUSE);
 330                                 }
 331                         }
 332                         if (prison && prison_ip(td, 0, &sin->sin_addr.s_addr))
 333                                 return (EADDRNOTAVAIL);
 334                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 335                             lport, prison ? 0 : wild);
 336                         if (t && !(reuseport & t->inp_socket->so_options)) {
 337 #ifdef INET6
 338                                 if (!in_nullhost(sin->sin_addr) ||
 339                                     !in_nullhost(t->inp_laddr) ||
 340                                     INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
 341 #endif
 342                                 return (EADDRINUSE);
 343                         }
 344                 }
 345                 inp->inp_laddr = sin->sin_addr;
 346         }
 347         if (lport == 0) {
 348                 ushort first, last;
 349                 int count;
 350
 351                 if (inp->inp_laddr.s_addr != INADDR_ANY &&
 352                     prison_ip(td, 0, &inp->inp_laddr.s_addr )) {
 353                         inp->inp_laddr.s_addr = INADDR_ANY;
 354                         return (EINVAL);
 355                 }
 356                 inp->inp_flags |= INP_ANONPORT;
 357
 358                 if (inp->inp_flags & INP_HIGHPORT) {
 359                         first = ipport_hifirstauto;     /* sysctl */
 360                         last  = ipport_hilastauto;
 361                         lastport = &pcbinfo->lasthi;
 362                 } else if (inp->inp_flags & INP_LOWPORT) {
 363                         if (p &&
 364                             (error = suser_cred(p->p_ucred, PRISON_ROOT))) {
 365                                 inp->inp_laddr.s_addr = INADDR_ANY;
 366                                 return (error);
 367                         }
 368                         first = ipport_lowfirstauto;    /* 1023 */
 369                         last  = ipport_lowlastauto;     /* 600 */
 370                         lastport = &pcbinfo->lastlow;
 371                 } else {
 372                         first = ipport_firstauto;       /* sysctl */
 373                         last  = ipport_lastauto;
 374                         lastport = &pcbinfo->lastport;
 375                 }
 376                 /*
 377                  * Simple check to ensure all ports are not used up causing
 378                  * a deadlock here.
 379                  *
 380                  * We split the two cases (up and down) so that the direction
 381                  * is not being tested on each round of the loop.
 382                  */
 383                 if (first > last) {
 384                         /*
 385                          * counting down
 386                          */
 387                         count = first - last;
 388
 389                         do {
 390                                 if (count-- < 0) {      /* completely used? */
 391                                         inp->inp_laddr.s_addr = INADDR_ANY;
 392                                         return (EADDRNOTAVAIL);
 393                                 }
 394                                 --*lastport;
 395                                 if (*lastport > first || *lastport < last)
 396                                         *lastport = first;
 397                                 lport = htons(*lastport);
 398                         } while (in_pcblookup_local(pcbinfo,
 399                                  inp->inp_laddr, lport, wild));
 400                 } else {
 401                         /*
 402                          * counting up
 403                          */
 404                         count = last - first;
 405
 406                         do {
 407                                 if (count-- < 0) {      /* completely used? */
 408                                         inp->inp_laddr.s_addr = INADDR_ANY;
 409                                         return (EADDRNOTAVAIL);
 410                                 }
 411                                 ++*lastport;
 412                                 if (*lastport < first || *lastport > last)
 413                                         *lastport = first;
 414                                 lport = htons(*lastport);
 415                         } while (in_pcblookup_local(pcbinfo,
 416                                  inp->inp_laddr, lport, wild));
 417                 }
 418         }
 419         inp->inp_lport = lport;
 420         if (prison_ip(td, 0, &inp->inp_laddr.s_addr)) {
 421                 inp->inp_laddr.s_addr = INADDR_ANY;
 422                 inp->inp_lport = 0;
 423                 return (EINVAL);
 424         }
 425         if (in_pcbinsporthash(inp) != 0) {
 426                 inp->inp_laddr.s_addr = INADDR_ANY;
 427                 inp->inp_lport = 0;
 428                 return (EAGAIN);
 429         }
 430         return (0);
 431 }
 432
 433 /*
 434  *   Transform old in_pcbconnect() into an inner subroutine for new
 435  *   in_pcbconnect(): Do some validity-checking on the remote
 436  *   address (in mbuf 'nam') and then determine local host address
 437  *   (i.e., which interface) to use to access that remote host.
 438  *
 439  *   This preserves definition of in_pcbconnect(), while supporting a
 440  *   slightly different version for T/TCP.  (This is more than
 441  *   a bit of a kludge, but cleaning up the internal interfaces would
 442  *   have forced minor changes in every protocol).
 443  */
 444 int
 445 in_pcbladdr(inp, nam, plocal_sin)
 446         struct inpcb *inp;
 447         struct sockaddr *nam;
 448         struct sockaddr_in **plocal_sin;
 449 {
 450         struct in_ifaddr *ia;
 451         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 452
 453         if (nam->sa_len != sizeof *sin)
 454                 return (EINVAL);
 455         if (sin->sin_family != AF_INET)
 456                 return (EAFNOSUPPORT);
 457         if (sin->sin_port == 0)
 458                 return (EADDRNOTAVAIL);
 459         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 460                 ia = TAILQ_FIRST(&in_ifaddrhead);
 461                 /*
 462                  * If the destination address is INADDR_ANY,
 463                  * use the primary local address.
 464                  * If the supplied address is INADDR_BROADCAST,
 465                  * and the primary interface supports broadcast,
 466                  * choose the broadcast address for that interface.
 467                  */
 468                 if (sin->sin_addr.s_addr == INADDR_ANY)
 469                         sin->sin_addr = IA_SIN(ia)->sin_addr;
 470                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
 471                     (ia->ia_ifp->if_flags & IFF_BROADCAST))
 472                         sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
 473         }
 474         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 475                 struct route *ro;
 476
 477                 ia = (struct in_ifaddr *)NULL;
 478                 /*
 479                  * If route is known or can be allocated now,
 480                  * our src addr is taken from the i/f, else punt.
 481                  * Note that we should check the address family of the cached
 482                  * destination, in case of sharing the cache with IPv6.
 483                  */
 484                 ro = &inp->inp_route;
 485                 if (ro->ro_rt &&
 486                     (!(ro->ro_rt->rt_flags & RTF_UP) ||
 487                      ro->ro_dst.sa_family != AF_INET ||
 488                      satosin(&ro->ro_dst)->sin_addr.s_addr !=
 489                                       sin->sin_addr.s_addr ||
 490                      inp->inp_socket->so_options & SO_DONTROUTE)) {
 491                         RTFREE(ro->ro_rt);
 492                         ro->ro_rt = (struct rtentry *)NULL;
 493                 }
 494                 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 495                     (ro->ro_rt == (struct rtentry *)NULL ||
 496                     ro->ro_rt->rt_ifp == (struct ifnet *)NULL)) {
 497                         /* No route yet, so try to acquire one */
 498                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 499                         ro->ro_dst.sa_family = AF_INET;
 500                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 501                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
 502                                 sin->sin_addr;
 503                         rtalloc(ro);
 504                 }
 505                 /*
 506                  * If we found a route, use the address
 507                  * corresponding to the outgoing interface
 508                  * unless it is the loopback (in case a route
 509                  * to our address on another net goes to loopback).
 510                  */
 511                 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
 512                         ia = ifatoia(ro->ro_rt->rt_ifa);
 513                 if (ia == NULL) {
 514                         u_short fport = sin->sin_port;
 515
 516                         sin->sin_port = 0;
 517                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
 518                         if (ia == NULL)
 519                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
 520                         sin->sin_port = fport;
 521                         if (ia == NULL)
 522                                 ia = TAILQ_FIRST(&in_ifaddrhead);
 523                         if (ia == NULL)
 524                                 return (EADDRNOTAVAIL);
 525                 }
 526                 /*
 527                  * If the destination address is multicast and an outgoing
 528                  * interface has been set as a multicast option, use the
 529                  * address of that interface as our source address.
 530                  */
 531                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 532                     inp->inp_moptions != NULL) {
 533                         struct ip_moptions *imo;
 534                         struct ifnet *ifp;
 535
 536                         imo = inp->inp_moptions;
 537                         if (imo->imo_multicast_ifp != NULL) {
 538                                 ifp = imo->imo_multicast_ifp;
 539                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
 540                                         if (ia->ia_ifp == ifp)
 541                                                 break;
 542                                 if (ia == NULL)
 543                                         return (EADDRNOTAVAIL);
 544                         }
 545                 }
 546                 /*
 547                  * Don't do pcblookup call here; return interface in plocal_sin
 548                  * and exit to caller, that will do the lookup.
 549                  */
 550                 *plocal_sin = &ia->ia_addr;
 551
 552         }
 553         return (0);
 554 }
 555
 556 /*
 557  * Outer subroutine:
 558  * Connect from a socket to a specified address.
 559  * Both address and port must be specified in argument sin.
 560  * If don't have a local address for this socket yet,
 561  * then pick one.
 562  */
 563 int
 564 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 565 {
 566         struct sockaddr_in *if_sin;
 567         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 568         struct sockaddr_in sa;
 569         struct ucred *cr = td->td_proc ? td->td_proc->p_ucred : NULL;
 570         int error;
 571
 572         if (cr && cr->cr_prison != NULL && in_nullhost(inp->inp_laddr)) {
 573                 bzero(&sa, sizeof sa);
 574                 sa.sin_addr.s_addr = htonl(cr->cr_prison->pr_ip);
 575                 sa.sin_len = sizeof sa;
 576                 sa.sin_family = AF_INET;
 577                 error = in_pcbbind(inp, (struct sockaddr *)&sa, td);
 578                 if (error)
 579                         return (error);
 580         }
 581
 582         /* Call inner routine to assign local interface address. */
 583         if ((error = in_pcbladdr(inp, nam, &if_sin)) != 0)
 584                 return (error);
 585
 586         if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port,
 587             inp->inp_laddr.s_addr ? inp->inp_laddr : if_sin->sin_addr,
 588             inp->inp_lport, FALSE, NULL) != NULL) {
 589                 return (EADDRINUSE);
 590         }
 591         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 592                 if (inp->inp_lport == 0) {
 593                         error = in_pcbbind(inp, (struct sockaddr *)NULL, td);
 594                         if (error)
 595                                 return (error);
 596                 }
 597                 inp->inp_laddr = if_sin->sin_addr;
 598         }
 599         inp->inp_faddr = sin->sin_addr;
 600         inp->inp_fport = sin->sin_port;
 601         in_pcbinsconnhash(inp);
 602         return (0);
 603 }
 604
 605 void
 606 in_pcbdisconnect(inp)
 607         struct inpcb *inp;
 608 {
 609
 610         inp->inp_faddr.s_addr = INADDR_ANY;
 611         inp->inp_fport = 0;
 612         in_pcbremconnhash(inp);
 613         if (inp->inp_socket->so_state & SS_NOFDREF)
 614                 in_pcbdetach(inp);
 615 }
 616
 617 void
 618 in_pcbdetach(inp)
 619         struct inpcb *inp;
 620 {
 621         struct socket *so = inp->inp_socket;
 622         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 623
 624 #ifdef IPSEC
 625         ipsec4_delete_pcbpolicy(inp);
 626 #endif /*IPSEC*/
 627         inp->inp_gencnt = ++ipi->ipi_gencnt;
 628         in_pcbremlists(inp);
 629         so->so_pcb = 0;
 630         sofree(so);
 631         if (inp->inp_options)
 632                 m_free(inp->inp_options);
 633         if (inp->inp_route.ro_rt)
 634                 rtfree(inp->inp_route.ro_rt);
 635         ip_freemoptions(inp->inp_moptions);
 636         inp->inp_vflag = 0;
 637         zfree(ipi->ipi_zone, inp);
 638 }
 639
 640 /*
 641  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
 642  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 643  * in struct pr_usrreqs, so that protocols can just reference then directly
 644  * without the need for a wrapper function.  The socket must have a valid
 645  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 646  * except through a kernel programming error, so it is acceptable to panic
 647  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 648  * because there actually /is/ a programming error somewhere... XXX)
 649  */
 650 int
 651 in_setsockaddr(so, nam)
 652         struct socket *so;
 653         struct sockaddr **nam;
 654 {
 655         struct inpcb *inp;
 656         struct sockaddr_in *sin;
 657
 658         /*
 659          * Do the malloc first in case it blocks.
 660          */
 661         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 662                 M_WAITOK | M_ZERO);
 663         sin->sin_family = AF_INET;
 664         sin->sin_len = sizeof *sin;
 665
 666         crit_enter();
 667         inp = so->so_pcb;
 668         if (!inp) {
 669                 crit_exit();
 670                 free(sin, M_SONAME);
 671                 return (ECONNRESET);
 672         }
 673         sin->sin_port = inp->inp_lport;
 674         sin->sin_addr = inp->inp_laddr;
 675         crit_exit();
 676
 677         *nam = (struct sockaddr *)sin;
 678         return (0);
 679 }
 680
 681 int
 682 in_setpeeraddr(so, nam)
 683         struct socket *so;
 684         struct sockaddr **nam;
 685 {
 686         struct inpcb *inp;
 687         struct sockaddr_in *sin;
 688
 689         /*
 690          * Do the malloc first in case it blocks.
 691          */
 692         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 693                 M_WAITOK | M_ZERO);
 694         sin->sin_family = AF_INET;
 695         sin->sin_len = sizeof *sin;
 696
 697         crit_enter();
 698         inp = so->so_pcb;
 699         if (!inp) {
 700                 crit_exit();
 701                 free(sin, M_SONAME);
 702                 return (ECONNRESET);
 703         }
 704         sin->sin_port = inp->inp_fport;
 705         sin->sin_addr = inp->inp_faddr;
 706         crit_exit();
 707
 708         *nam = (struct sockaddr *)sin;
 709         return (0);
 710 }
 711
 712 void
 713 in_pcbnotifyall(head, faddr, errno, notify)
 714         struct inpcbhead *head;
 715         struct in_addr faddr;
 716         void (*notify) (struct inpcb *, int);
 717 {
 718         struct inpcb *inp, *ninp;
 719
 720         /*
 721          * note: if INP_PLACEMARKER is set we must ignore the rest of
 722          * the structure and skip it.
 723          */
 724         crit_enter();
 725         LIST_FOREACH_MUTABLE(inp, head, inp_list, ninp) {
 726                 if (inp->inp_flags & INP_PLACEMARKER)
 727                         continue;
 728 #ifdef INET6
 729                 if (!(inp->inp_vflag & INP_IPV4))
 730                         continue;
 731 #endif
 732                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 733                     inp->inp_socket == NULL)
 734                         continue;
 735                 (*notify)(inp, errno);          /* can remove inp from list! */
 736         }
 737         crit_exit();
 738 }
 739
 740 void
 741 in_pcbpurgeif0(head, ifp)
 742         struct inpcb *head;
 743         struct ifnet *ifp;
 744 {
 745         struct inpcb *inp;
 746         struct ip_moptions *imo;
 747         int i, gap;
 748
 749         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
 750                 if (inp->inp_flags & INP_PLACEMARKER)
 751                         continue;
 752                 imo = inp->inp_moptions;
 753                 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) {
 754                         /*
 755                          * Unselect the outgoing interface if it is being
 756                          * detached.
 757                          */
 758                         if (imo->imo_multicast_ifp == ifp)
 759                                 imo->imo_multicast_ifp = NULL;
 760
 761                         /*
 762                          * Drop multicast group membership if we joined
 763                          * through the interface being detached.
 764                          */
 765                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 766                             i++) {
 767                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 768                                         in_delmulti(imo->imo_membership[i]);
 769                                         gap++;
 770                                 } else if (gap != 0)
 771                                         imo->imo_membership[i - gap] =
 772                                             imo->imo_membership[i];
 773                         }
 774                         imo->imo_num_memberships -= gap;
 775                 }
 776         }
 777 }
 778
 779 /*
 780  * Check for alternatives when higher level complains
 781  * about service problems.  For now, invalidate cached
 782  * routing information.  If the route was created dynamically
 783  * (by a redirect), time to try a default gateway again.
 784  */
 785 void
 786 in_losing(struct inpcb *inp)
 787 {
 788         struct rtentry *rt;
 789         struct rt_addrinfo rtinfo;
 790
 791         if ((rt = inp->inp_route.ro_rt)) {
 792                 bzero(&rtinfo, sizeof(struct rt_addrinfo));
 793                 rtinfo.rti_info[RTAX_DST] = rt_key(rt);
 794                 rtinfo.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 795                 rtinfo.rti_info[RTAX_NETMASK] = rt_mask(rt);
 796                 rtinfo.rti_flags = rt->rt_flags;
 797                 rt_missmsg(RTM_LOSING, &rtinfo, rt->rt_flags, 0);
 798                 if (rt->rt_flags & RTF_DYNAMIC)
 799                         rtrequest1(RTM_DELETE, &rtinfo, NULL);
 800                 inp->inp_route.ro_rt = NULL;
 801                 rtfree(rt);
 802                 /*
 803                  * A new route can be allocated
 804                  * the next time output is attempted.
 805                  */
 806         }
 807 }
 808
 809 /*
 810  * After a routing change, flush old routing
 811  * and allocate a (hopefully) better one.
 812  */
 813 void
 814 in_rtchange(inp, errno)
 815         struct inpcb *inp;
 816         int errno;
 817 {
 818         if (inp->inp_route.ro_rt) {
 819                 rtfree(inp->inp_route.ro_rt);
 820                 inp->inp_route.ro_rt = NULL;
 821                 /*
 822                  * A new route can be allocated the next time
 823                  * output is attempted.
 824                  */
 825         }
 826 }
 827
 828 /*
 829  * Lookup a PCB based on the local address and port.
 830  */
 831 struct inpcb *
 832 in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
 833         struct inpcbinfo *pcbinfo;
 834         struct in_addr laddr;
 835         u_int lport_arg;
 836         int wild_okay;
 837 {
 838         struct inpcb *inp;
 839         int matchwild = 3, wildcard;
 840         u_short lport = lport_arg;
 841
 842         struct inpcbporthead *porthash;
 843         struct inpcbport *phd;
 844         struct inpcb *match = NULL;
 845
 846         /*
 847          * Best fit PCB lookup.
 848          *
 849          * First see if this local port is in use by looking on the
 850          * port hash list.
 851          */
 852         porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 853             pcbinfo->porthashmask)];
 854         LIST_FOREACH(phd, porthash, phd_hash) {
 855                 if (phd->phd_port == lport)
 856                         break;
 857         }
 858         if (phd != NULL) {
 859                 /*
 860                  * Port is in use by one or more PCBs. Look for best
 861                  * fit.
 862                  */
 863                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 864                         wildcard = 0;
 865 #ifdef INET6
 866                         if ((inp->inp_vflag & INP_IPV4) == 0)
 867                                 continue;
 868 #endif
 869                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 870                                 wildcard++;
 871                         if (inp->inp_laddr.s_addr != INADDR_ANY) {
 872                                 if (laddr.s_addr == INADDR_ANY)
 873                                         wildcard++;
 874                                 else if (inp->inp_laddr.s_addr != laddr.s_addr)
 875                                         continue;
 876                         } else {
 877                                 if (laddr.s_addr != INADDR_ANY)
 878                                         wildcard++;
 879                         }
 880                         if (wildcard && !wild_okay)
 881                                 continue;
 882                         if (wildcard < matchwild) {
 883                                 match = inp;
 884                                 matchwild = wildcard;
 885                                 if (matchwild == 0) {
 886                                         break;
 887                                 }
 888                         }
 889                 }
 890         }
 891         return (match);
 892 }
 893
 894 /*
 895  * Lookup PCB in hash list.
 896  */
 897 struct inpcb *
 898 in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
 899         struct inpcbinfo *pcbinfo;
 900         struct in_addr faddr, laddr;
 901         u_int fport_arg, lport_arg;
 902         boolean_t wildcard;
 903         struct ifnet *ifp;
 904 {
 905         struct inpcbhead *head;
 906         struct inpcb *inp;
 907         u_short fport = fport_arg, lport = lport_arg;
 908
 909         /*
 910          * First look for an exact match.
 911          */
 912         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport,
 913             laddr.s_addr, lport, pcbinfo->hashmask)];
 914         LIST_FOREACH(inp, head, inp_hash) {
 915 #ifdef INET6
 916                 if (!(inp->inp_vflag & INP_IPV4))
 917                         continue;
 918 #endif
 919                 if (in_hosteq(inp->inp_faddr, faddr) &&
 920                     in_hosteq(inp->inp_laddr, laddr) &&
 921                     inp->inp_fport == fport && inp->inp_lport == lport) {
 922                         /* found */
 923                         return (inp);
 924                 }
 925         }
 926
 927         if (wildcard) {
 928                 struct inpcb *local_wild = NULL;
 929 #ifdef INET6
 930                 struct inpcb *local_wild_mapped = NULL;
 931 #endif
 932                 struct inpcontainer *ic;
 933                 struct inpcontainerhead *chead;
 934
 935                 chead = &pcbinfo->wildcardhashbase[
 936                     INP_PCBWILDCARDHASH(lport, pcbinfo->wildcardhashmask)];
 937                 LIST_FOREACH(ic, chead, ic_list) {
 938                         inp = ic->ic_inp;
 939 #ifdef INET6
 940                         if (!(inp->inp_vflag & INP_IPV4))
 941                                 continue;
 942 #endif
 943                         if (inp->inp_lport == lport) {
 944                                 if (ifp && ifp->if_type == IFT_FAITH &&
 945                                     !(inp->inp_flags & INP_FAITH))
 946                                         continue;
 947                                 if (inp->inp_laddr.s_addr == laddr.s_addr)
 948                                         return (inp);
 949                                 if (inp->inp_laddr.s_addr == INADDR_ANY) {
 950 #ifdef INET6
 951                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
 952                                                              AF_INET6))
 953                                                 local_wild_mapped = inp;
 954                                         else
 955 #endif
 956                                                 local_wild = inp;
 957                                 }
 958                         }
 959                 }
 960 #ifdef INET6
 961                 if (local_wild == NULL)
 962                         return (local_wild_mapped);
 963 #endif
 964                 return (local_wild);
 965         }
 966
 967         /*
 968          * Not found.
 969          */
 970         return (NULL);
 971 }
 972
 973 /*
 974  * Insert PCB into connection hash table.
 975  */
 976 void
 977 in_pcbinsconnhash(struct inpcb *inp)
 978 {
 979         struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo;
 980         struct inpcbhead *bucket;
 981         u_int32_t hashkey_faddr, hashkey_laddr;
 982
 983 #ifdef INET6
 984         if (inp->inp_vflag & INP_IPV6) {
 985                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */;
 986                 hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */;
 987         } else {
 988 #endif
 989                 hashkey_faddr = inp->inp_faddr.s_addr;
 990                 hashkey_laddr = inp->inp_laddr.s_addr;
 991 #ifdef INET6
 992         }
 993 #endif
 994
 995         KASSERT(!(inp->inp_flags & INP_CONNECTED), ("already on hash list"));
 996         inp->inp_flags |= INP_CONNECTED;
 997
 998         /*
 999          * Insert into the connection hash table.
1000          */
1001         bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr,
1002             inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)];
1003         LIST_INSERT_HEAD(bucket, inp, inp_hash);
1004 }
1005
1006 /*
1007  * Remove PCB from connection hash table.
1008  */
1009 void
1010 in_pcbremconnhash(struct inpcb *inp)
1011 {
1012         KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected"));
1013         LIST_REMOVE(inp, inp_hash);
1014         inp->inp_flags &= ~INP_CONNECTED;
1015 }
1016
1017 /*
1018  * Insert PCB into port hash table.
1019  */
1020 int
1021 in_pcbinsporthash(struct inpcb *inp)
1022 {
1023         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1024         struct inpcbporthead *pcbporthash;
1025         struct inpcbport *phd;
1026
1027         /*
1028          * Insert into the port hash table.
1029          */
1030         pcbporthash = &pcbinfo->porthashbase[
1031             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->porthashmask)];
1032
1033         /* Go through port list and look for a head for this lport. */
1034         LIST_FOREACH(phd, pcbporthash, phd_hash)
1035                 if (phd->phd_port == inp->inp_lport)
1036                         break;
1037
1038         /* If none exists, malloc one and tack it on. */
1039         if (phd == NULL) {
1040                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport),
1041                     M_PCB, M_INTWAIT | M_NULLOK);
1042                 if (phd == NULL)
1043                         return (ENOBUFS); /* XXX */
1044                 phd->phd_port = inp->inp_lport;
1045                 LIST_INIT(&phd->phd_pcblist);
1046                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1047         }
1048
1049         inp->inp_phd = phd;
1050         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1051
1052         return (0);
1053 }
1054
1055 void
1056 in_pcbinswildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1057 {
1058         struct inpcontainer *ic;
1059         struct inpcontainerhead *bucket;
1060
1061         bucket = &pcbinfo->wildcardhashbase[
1062             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1063
1064         ic = malloc(sizeof(struct inpcontainer), M_TEMP, M_INTWAIT);
1065         ic->ic_inp = inp;
1066         LIST_INSERT_HEAD(bucket, ic, ic_list);
1067 }
1068
1069 /*
1070  * Insert PCB into wildcard hash table.
1071  */
1072 void
1073 in_pcbinswildcardhash(struct inpcb *inp)
1074 {
1075         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1076
1077         KKASSERT(pcbinfo != NULL);
1078
1079         in_pcbinswildcardhash_oncpu(inp, pcbinfo);
1080         inp->inp_flags |= INP_WILDCARD;
1081 }
1082
1083 void
1084 in_pcbremwildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1085 {
1086         struct inpcontainer *ic;
1087         struct inpcontainerhead *head;
1088
1089         /* find bucket */
1090         head = &pcbinfo->wildcardhashbase[
1091             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1092
1093         LIST_FOREACH(ic, head, ic_list) {
1094                 if (ic->ic_inp == inp)
1095                         goto found;
1096         }
1097         return;                 /* not found! */
1098
1099 found:
1100         LIST_REMOVE(ic, ic_list);       /* remove container from bucket chain */
1101         free(ic, M_TEMP);               /* deallocate container */
1102 }
1103
1104 /*
1105  * Remove PCB from wildcard hash table.
1106  */
1107 void
1108 in_pcbremwildcardhash(struct inpcb *inp)
1109 {
1110         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1111
1112         KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard"));
1113         in_pcbremwildcardhash_oncpu(inp, pcbinfo);
1114         inp->inp_flags &= ~INP_WILDCARD;
1115 }
1116
1117 /*
1118  * Remove PCB from various lists.
1119  */
1120 void
1121 in_pcbremlists(inp)
1122         struct inpcb *inp;
1123 {
1124         if (inp->inp_lport) {
1125                 struct inpcbport *phd = inp->inp_phd;
1126
1127                 LIST_REMOVE(inp, inp_portlist);
1128                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1129                         LIST_REMOVE(phd, phd_hash);
1130                         free(phd, M_PCB);
1131                 }
1132         }
1133         if (inp->inp_flags & INP_WILDCARD) {
1134                 in_pcbremwildcardhash(inp);
1135         } else if (inp->inp_flags & INP_CONNECTED) {
1136                 in_pcbremconnhash(inp);
1137         }
1138         LIST_REMOVE(inp, inp_list);
1139         inp->inp_pcbinfo->ipi_count--;
1140 }
1141
1142 int
1143 prison_xinpcb(struct thread *td, struct inpcb *inp)
1144 {
1145         struct ucred *cr;
1146
1147         if (td->td_proc == NULL)
1148                 return (0);
1149         cr = td->td_proc->p_ucred;
1150         if (cr->cr_prison == NULL)
1151                 return (0);
1152         if (ntohl(inp->inp_laddr.s_addr) == cr->cr_prison->pr_ip)
1153                 return (0);
1154         return (1);
1155 }
1156
1157 int
1158 in_pcblist_global(SYSCTL_HANDLER_ARGS)
1159 {
1160         struct inpcbinfo *pcbinfo = arg1;
1161         struct inpcb *inp, *marker;
1162         struct xinpcb xi;
1163         int error, i, n;
1164         inp_gen_t gencnt;
1165
1166         /*
1167          * The process of preparing the TCB list is too time-consuming and
1168          * resource-intensive to repeat twice on every request.
1169          */
1170         if (req->oldptr == NULL) {
1171                 n = pcbinfo->ipi_count;
1172                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1173                 return 0;
1174         }
1175
1176         if (req->newptr != NULL)
1177                 return EPERM;
1178
1179         /*
1180          * OK, now we're committed to doing something.  Re-fetch ipi_count
1181          * after obtaining the generation count.
1182          */
1183         gencnt = pcbinfo->ipi_gencnt;
1184         n = pcbinfo->ipi_count;
1185
1186         marker = malloc(sizeof(struct inpcb), M_TEMP, M_WAITOK|M_ZERO);
1187         marker->inp_flags |= INP_PLACEMARKER;
1188         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
1189
1190         i = 0;
1191         error = 0;
1192
1193         while ((inp = LIST_NEXT(marker, inp_list)) != NULL && i < n) {
1194                 LIST_REMOVE(marker, inp_list);
1195                 LIST_INSERT_AFTER(inp, marker, inp_list);
1196
1197                 if (inp->inp_flags & INP_PLACEMARKER)
1198                         continue;
1199                 if (inp->inp_gencnt > gencnt)
1200                         continue;
1201                 if (prison_xinpcb(req->td, inp))
1202                         continue;
1203                 bzero(&xi, sizeof xi);
1204                 xi.xi_len = sizeof xi;
1205                 bcopy(inp, &xi.xi_inp, sizeof *inp);
1206                 if (inp->inp_socket)
1207                         sotoxsocket(inp->inp_socket, &xi.xi_socket);
1208                 if ((error = SYSCTL_OUT(req, &xi, sizeof xi)) != 0)
1209                         break;
1210                 ++i;
1211         }
1212         LIST_REMOVE(marker, inp_list);
1213         if (error == 0 && i < n) {
1214                 bzero(&xi, sizeof xi);
1215                 xi.xi_len = sizeof xi;
1216                 while (i < n) {
1217                         error = SYSCTL_OUT(req, &xi, sizeof xi);
1218                         ++i;
1219                 }
1220         }
1221         free(marker, M_TEMP);
1222         return(error);
1223 }