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 1.38 2006/01/31 19:05:40 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(struct inpcb *inp, struct sockaddr *nam, struct sockaddr_in **plocal_sin)
 446 {
 447         struct in_ifaddr *ia;
 448         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 449
 450         if (nam->sa_len != sizeof *sin)
 451                 return (EINVAL);
 452         if (sin->sin_family != AF_INET)
 453                 return (EAFNOSUPPORT);
 454         if (sin->sin_port == 0)
 455                 return (EADDRNOTAVAIL);
 456         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 457                 ia = TAILQ_FIRST(&in_ifaddrhead);
 458                 /*
 459                  * If the destination address is INADDR_ANY,
 460                  * use the primary local address.
 461                  * If the supplied address is INADDR_BROADCAST,
 462                  * and the primary interface supports broadcast,
 463                  * choose the broadcast address for that interface.
 464                  */
 465                 if (sin->sin_addr.s_addr == INADDR_ANY)
 466                         sin->sin_addr = IA_SIN(ia)->sin_addr;
 467                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
 468                     (ia->ia_ifp->if_flags & IFF_BROADCAST))
 469                         sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
 470         }
 471         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 472                 struct route *ro;
 473
 474                 ia = (struct in_ifaddr *)NULL;
 475                 /*
 476                  * If route is known or can be allocated now,
 477                  * our src addr is taken from the i/f, else punt.
 478                  * Note that we should check the address family of the cached
 479                  * destination, in case of sharing the cache with IPv6.
 480                  */
 481                 ro = &inp->inp_route;
 482                 if (ro->ro_rt &&
 483                     (!(ro->ro_rt->rt_flags & RTF_UP) ||
 484                      ro->ro_dst.sa_family != AF_INET ||
 485                      satosin(&ro->ro_dst)->sin_addr.s_addr !=
 486                                       sin->sin_addr.s_addr ||
 487                      inp->inp_socket->so_options & SO_DONTROUTE)) {
 488                         RTFREE(ro->ro_rt);
 489                         ro->ro_rt = (struct rtentry *)NULL;
 490                 }
 491                 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 492                     (ro->ro_rt == (struct rtentry *)NULL ||
 493                     ro->ro_rt->rt_ifp == (struct ifnet *)NULL)) {
 494                         /* No route yet, so try to acquire one */
 495                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 496                         ro->ro_dst.sa_family = AF_INET;
 497                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 498                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
 499                                 sin->sin_addr;
 500                         rtalloc(ro);
 501                 }
 502                 /*
 503                  * If we found a route, use the address
 504                  * corresponding to the outgoing interface
 505                  * unless it is the loopback (in case a route
 506                  * to our address on another net goes to loopback).
 507                  */
 508                 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
 509                         ia = ifatoia(ro->ro_rt->rt_ifa);
 510                 if (ia == NULL) {
 511                         u_short fport = sin->sin_port;
 512
 513                         sin->sin_port = 0;
 514                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
 515                         if (ia == NULL)
 516                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
 517                         sin->sin_port = fport;
 518                         if (ia == NULL)
 519                                 ia = TAILQ_FIRST(&in_ifaddrhead);
 520                         if (ia == NULL)
 521                                 return (EADDRNOTAVAIL);
 522                 }
 523                 /*
 524                  * If the destination address is multicast and an outgoing
 525                  * interface has been set as a multicast option, use the
 526                  * address of that interface as our source address.
 527                  */
 528                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 529                     inp->inp_moptions != NULL) {
 530                         struct ip_moptions *imo;
 531                         struct ifnet *ifp;
 532
 533                         imo = inp->inp_moptions;
 534                         if (imo->imo_multicast_ifp != NULL) {
 535                                 ifp = imo->imo_multicast_ifp;
 536                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
 537                                         if (ia->ia_ifp == ifp)
 538                                                 break;
 539                                 if (ia == NULL)
 540                                         return (EADDRNOTAVAIL);
 541                         }
 542                 }
 543                 /*
 544                  * Don't do pcblookup call here; return interface in plocal_sin
 545                  * and exit to caller, that will do the lookup.
 546                  */
 547                 *plocal_sin = &ia->ia_addr;
 548
 549         }
 550         return (0);
 551 }
 552
 553 /*
 554  * Outer subroutine:
 555  * Connect from a socket to a specified address.
 556  * Both address and port must be specified in argument sin.
 557  * If don't have a local address for this socket yet,
 558  * then pick one.
 559  */
 560 int
 561 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 562 {
 563         struct sockaddr_in *if_sin;
 564         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 565         struct sockaddr_in sa;
 566         struct ucred *cr = td->td_proc ? td->td_proc->p_ucred : NULL;
 567         int error;
 568
 569         if (cr && cr->cr_prison != NULL && in_nullhost(inp->inp_laddr)) {
 570                 bzero(&sa, sizeof sa);
 571                 sa.sin_addr.s_addr = htonl(cr->cr_prison->pr_ip);
 572                 sa.sin_len = sizeof sa;
 573                 sa.sin_family = AF_INET;
 574                 error = in_pcbbind(inp, (struct sockaddr *)&sa, td);
 575                 if (error)
 576                         return (error);
 577         }
 578
 579         /* Call inner routine to assign local interface address. */
 580         if ((error = in_pcbladdr(inp, nam, &if_sin)) != 0)
 581                 return (error);
 582
 583         if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port,
 584             inp->inp_laddr.s_addr ? inp->inp_laddr : if_sin->sin_addr,
 585             inp->inp_lport, FALSE, NULL) != NULL) {
 586                 return (EADDRINUSE);
 587         }
 588         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 589                 if (inp->inp_lport == 0) {
 590                         error = in_pcbbind(inp, (struct sockaddr *)NULL, td);
 591                         if (error)
 592                                 return (error);
 593                 }
 594                 inp->inp_laddr = if_sin->sin_addr;
 595         }
 596         inp->inp_faddr = sin->sin_addr;
 597         inp->inp_fport = sin->sin_port;
 598         in_pcbinsconnhash(inp);
 599         return (0);
 600 }
 601
 602 void
 603 in_pcbdisconnect(struct inpcb *inp)
 604 {
 605
 606         inp->inp_faddr.s_addr = INADDR_ANY;
 607         inp->inp_fport = 0;
 608         in_pcbremconnhash(inp);
 609         if (inp->inp_socket->so_state & SS_NOFDREF)
 610                 in_pcbdetach(inp);
 611 }
 612
 613 void
 614 in_pcbdetach(struct inpcb *inp)
 615 {
 616         struct socket *so = inp->inp_socket;
 617         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 618
 619 #ifdef IPSEC
 620         ipsec4_delete_pcbpolicy(inp);
 621 #endif /*IPSEC*/
 622         inp->inp_gencnt = ++ipi->ipi_gencnt;
 623         in_pcbremlists(inp);
 624         so->so_pcb = 0;
 625         sofree(so);
 626         if (inp->inp_options)
 627                 m_free(inp->inp_options);
 628         if (inp->inp_route.ro_rt)
 629                 rtfree(inp->inp_route.ro_rt);
 630         ip_freemoptions(inp->inp_moptions);
 631         inp->inp_vflag = 0;
 632         zfree(ipi->ipi_zone, inp);
 633 }
 634
 635 /*
 636  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
 637  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 638  * in struct pr_usrreqs, so that protocols can just reference then directly
 639  * without the need for a wrapper function.  The socket must have a valid
 640  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 641  * except through a kernel programming error, so it is acceptable to panic
 642  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 643  * because there actually /is/ a programming error somewhere... XXX)
 644  */
 645 int
 646 in_setsockaddr(struct socket *so, struct sockaddr **nam)
 647 {
 648         struct inpcb *inp;
 649         struct sockaddr_in *sin;
 650
 651         /*
 652          * Do the malloc first in case it blocks.
 653          */
 654         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 655                 M_WAITOK | M_ZERO);
 656         sin->sin_family = AF_INET;
 657         sin->sin_len = sizeof *sin;
 658
 659         crit_enter();
 660         inp = so->so_pcb;
 661         if (!inp) {
 662                 crit_exit();
 663                 free(sin, M_SONAME);
 664                 return (ECONNRESET);
 665         }
 666         sin->sin_port = inp->inp_lport;
 667         sin->sin_addr = inp->inp_laddr;
 668         crit_exit();
 669
 670         *nam = (struct sockaddr *)sin;
 671         return (0);
 672 }
 673
 674 int
 675 in_setpeeraddr(struct socket *so, struct sockaddr **nam)
 676 {
 677         struct inpcb *inp;
 678         struct sockaddr_in *sin;
 679
 680         /*
 681          * Do the malloc first in case it blocks.
 682          */
 683         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 684                 M_WAITOK | M_ZERO);
 685         sin->sin_family = AF_INET;
 686         sin->sin_len = sizeof *sin;
 687
 688         crit_enter();
 689         inp = so->so_pcb;
 690         if (!inp) {
 691                 crit_exit();
 692                 free(sin, M_SONAME);
 693                 return (ECONNRESET);
 694         }
 695         sin->sin_port = inp->inp_fport;
 696         sin->sin_addr = inp->inp_faddr;
 697         crit_exit();
 698
 699         *nam = (struct sockaddr *)sin;
 700         return (0);
 701 }
 702
 703 void
 704 in_pcbnotifyall(struct inpcbhead *head, struct in_addr faddr, int errno,
 705                 void (*notify)(struct inpcb *, int))
 706 {
 707         struct inpcb *inp, *ninp;
 708
 709         /*
 710          * note: if INP_PLACEMARKER is set we must ignore the rest of
 711          * the structure and skip it.
 712          */
 713         crit_enter();
 714         LIST_FOREACH_MUTABLE(inp, head, inp_list, ninp) {
 715                 if (inp->inp_flags & INP_PLACEMARKER)
 716                         continue;
 717 #ifdef INET6
 718                 if (!(inp->inp_vflag & INP_IPV4))
 719                         continue;
 720 #endif
 721                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 722                     inp->inp_socket == NULL)
 723                         continue;
 724                 (*notify)(inp, errno);          /* can remove inp from list! */
 725         }
 726         crit_exit();
 727 }
 728
 729 void
 730 in_pcbpurgeif0(struct inpcb *head, struct ifnet *ifp)
 731 {
 732         struct inpcb *inp;
 733         struct ip_moptions *imo;
 734         int i, gap;
 735
 736         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
 737                 if (inp->inp_flags & INP_PLACEMARKER)
 738                         continue;
 739                 imo = inp->inp_moptions;
 740                 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) {
 741                         /*
 742                          * Unselect the outgoing interface if it is being
 743                          * detached.
 744                          */
 745                         if (imo->imo_multicast_ifp == ifp)
 746                                 imo->imo_multicast_ifp = NULL;
 747
 748                         /*
 749                          * Drop multicast group membership if we joined
 750                          * through the interface being detached.
 751                          */
 752                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 753                             i++) {
 754                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 755                                         in_delmulti(imo->imo_membership[i]);
 756                                         gap++;
 757                                 } else if (gap != 0)
 758                                         imo->imo_membership[i - gap] =
 759                                             imo->imo_membership[i];
 760                         }
 761                         imo->imo_num_memberships -= gap;
 762                 }
 763         }
 764 }
 765
 766 /*
 767  * Check for alternatives when higher level complains
 768  * about service problems.  For now, invalidate cached
 769  * routing information.  If the route was created dynamically
 770  * (by a redirect), time to try a default gateway again.
 771  */
 772 void
 773 in_losing(struct inpcb *inp)
 774 {
 775         struct rtentry *rt;
 776         struct rt_addrinfo rtinfo;
 777
 778         if ((rt = inp->inp_route.ro_rt)) {
 779                 bzero(&rtinfo, sizeof(struct rt_addrinfo));
 780                 rtinfo.rti_info[RTAX_DST] = rt_key(rt);
 781                 rtinfo.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 782                 rtinfo.rti_info[RTAX_NETMASK] = rt_mask(rt);
 783                 rtinfo.rti_flags = rt->rt_flags;
 784                 rt_missmsg(RTM_LOSING, &rtinfo, rt->rt_flags, 0);
 785                 if (rt->rt_flags & RTF_DYNAMIC)
 786                         rtrequest1_global(RTM_DELETE, &rtinfo, NULL, NULL);
 787                 inp->inp_route.ro_rt = NULL;
 788                 rtfree(rt);
 789                 /*
 790                  * A new route can be allocated
 791                  * the next time output is attempted.
 792                  */
 793         }
 794 }
 795
 796 /*
 797  * After a routing change, flush old routing
 798  * and allocate a (hopefully) better one.
 799  */
 800 void
 801 in_rtchange(struct inpcb *inp, int errno)
 802 {
 803         if (inp->inp_route.ro_rt) {
 804                 rtfree(inp->inp_route.ro_rt);
 805                 inp->inp_route.ro_rt = NULL;
 806                 /*
 807                  * A new route can be allocated the next time
 808                  * output is attempted.
 809                  */
 810         }
 811 }
 812
 813 /*
 814  * Lookup a PCB based on the local address and port.
 815  */
 816 struct inpcb *
 817 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr, u_int lport_arg,
 818                    int wild_okay)
 819 {
 820         struct inpcb *inp;
 821         int matchwild = 3, wildcard;
 822         u_short lport = lport_arg;
 823
 824         struct inpcbporthead *porthash;
 825         struct inpcbport *phd;
 826         struct inpcb *match = NULL;
 827
 828         /*
 829          * Best fit PCB lookup.
 830          *
 831          * First see if this local port is in use by looking on the
 832          * port hash list.
 833          */
 834         porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 835             pcbinfo->porthashmask)];
 836         LIST_FOREACH(phd, porthash, phd_hash) {
 837                 if (phd->phd_port == lport)
 838                         break;
 839         }
 840         if (phd != NULL) {
 841                 /*
 842                  * Port is in use by one or more PCBs. Look for best
 843                  * fit.
 844                  */
 845                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 846                         wildcard = 0;
 847 #ifdef INET6
 848                         if ((inp->inp_vflag & INP_IPV4) == 0)
 849                                 continue;
 850 #endif
 851                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 852                                 wildcard++;
 853                         if (inp->inp_laddr.s_addr != INADDR_ANY) {
 854                                 if (laddr.s_addr == INADDR_ANY)
 855                                         wildcard++;
 856                                 else if (inp->inp_laddr.s_addr != laddr.s_addr)
 857                                         continue;
 858                         } else {
 859                                 if (laddr.s_addr != INADDR_ANY)
 860                                         wildcard++;
 861                         }
 862                         if (wildcard && !wild_okay)
 863                                 continue;
 864                         if (wildcard < matchwild) {
 865                                 match = inp;
 866                                 matchwild = wildcard;
 867                                 if (matchwild == 0) {
 868                                         break;
 869                                 }
 870                         }
 871                 }
 872         }
 873         return (match);
 874 }
 875
 876 /*
 877  * Lookup PCB in hash list.
 878  */
 879 struct inpcb *
 880 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport_arg,
 881                   struct in_addr laddr, u_int lport_arg, boolean_t wildcard,
 882                   struct ifnet *ifp)
 883 {
 884         struct inpcbhead *head;
 885         struct inpcb *inp;
 886         u_short fport = fport_arg, lport = lport_arg;
 887
 888         /*
 889          * First look for an exact match.
 890          */
 891         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport,
 892             laddr.s_addr, lport, pcbinfo->hashmask)];
 893         LIST_FOREACH(inp, head, inp_hash) {
 894 #ifdef INET6
 895                 if (!(inp->inp_vflag & INP_IPV4))
 896                         continue;
 897 #endif
 898                 if (in_hosteq(inp->inp_faddr, faddr) &&
 899                     in_hosteq(inp->inp_laddr, laddr) &&
 900                     inp->inp_fport == fport && inp->inp_lport == lport) {
 901                         /* found */
 902                         return (inp);
 903                 }
 904         }
 905
 906         if (wildcard) {
 907                 struct inpcb *local_wild = NULL;
 908 #ifdef INET6
 909                 struct inpcb *local_wild_mapped = NULL;
 910 #endif
 911                 struct inpcontainer *ic;
 912                 struct inpcontainerhead *chead;
 913
 914                 chead = &pcbinfo->wildcardhashbase[
 915                     INP_PCBWILDCARDHASH(lport, pcbinfo->wildcardhashmask)];
 916                 LIST_FOREACH(ic, chead, ic_list) {
 917                         inp = ic->ic_inp;
 918 #ifdef INET6
 919                         if (!(inp->inp_vflag & INP_IPV4))
 920                                 continue;
 921 #endif
 922                         if (inp->inp_lport == lport) {
 923                                 if (ifp && ifp->if_type == IFT_FAITH &&
 924                                     !(inp->inp_flags & INP_FAITH))
 925                                         continue;
 926                                 if (inp->inp_laddr.s_addr == laddr.s_addr)
 927                                         return (inp);
 928                                 if (inp->inp_laddr.s_addr == INADDR_ANY) {
 929 #ifdef INET6
 930                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
 931                                                              AF_INET6))
 932                                                 local_wild_mapped = inp;
 933                                         else
 934 #endif
 935                                                 local_wild = inp;
 936                                 }
 937                         }
 938                 }
 939 #ifdef INET6
 940                 if (local_wild == NULL)
 941                         return (local_wild_mapped);
 942 #endif
 943                 return (local_wild);
 944         }
 945
 946         /*
 947          * Not found.
 948          */
 949         return (NULL);
 950 }
 951
 952 /*
 953  * Insert PCB into connection hash table.
 954  */
 955 void
 956 in_pcbinsconnhash(struct inpcb *inp)
 957 {
 958         struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo;
 959         struct inpcbhead *bucket;
 960         u_int32_t hashkey_faddr, hashkey_laddr;
 961
 962 #ifdef INET6
 963         if (inp->inp_vflag & INP_IPV6) {
 964                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */;
 965                 hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */;
 966         } else {
 967 #endif
 968                 hashkey_faddr = inp->inp_faddr.s_addr;
 969                 hashkey_laddr = inp->inp_laddr.s_addr;
 970 #ifdef INET6
 971         }
 972 #endif
 973
 974         KASSERT(!(inp->inp_flags & INP_CONNECTED), ("already on hash list"));
 975         inp->inp_flags |= INP_CONNECTED;
 976
 977         /*
 978          * Insert into the connection hash table.
 979          */
 980         bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr,
 981             inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)];
 982         LIST_INSERT_HEAD(bucket, inp, inp_hash);
 983 }
 984
 985 /*
 986  * Remove PCB from connection hash table.
 987  */
 988 void
 989 in_pcbremconnhash(struct inpcb *inp)
 990 {
 991         KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected"));
 992         LIST_REMOVE(inp, inp_hash);
 993         inp->inp_flags &= ~INP_CONNECTED;
 994 }
 995
 996 /*
 997  * Insert PCB into port hash table.
 998  */
 999 int
1000 in_pcbinsporthash(struct inpcb *inp)
1001 {
1002         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1003         struct inpcbporthead *pcbporthash;
1004         struct inpcbport *phd;
1005
1006         /*
1007          * Insert into the port hash table.
1008          */
1009         pcbporthash = &pcbinfo->porthashbase[
1010             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->porthashmask)];
1011
1012         /* Go through port list and look for a head for this lport. */
1013         LIST_FOREACH(phd, pcbporthash, phd_hash)
1014                 if (phd->phd_port == inp->inp_lport)
1015                         break;
1016
1017         /* If none exists, malloc one and tack it on. */
1018         if (phd == NULL) {
1019                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport),
1020                     M_PCB, M_INTWAIT | M_NULLOK);
1021                 if (phd == NULL)
1022                         return (ENOBUFS); /* XXX */
1023                 phd->phd_port = inp->inp_lport;
1024                 LIST_INIT(&phd->phd_pcblist);
1025                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1026         }
1027
1028         inp->inp_phd = phd;
1029         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1030
1031         return (0);
1032 }
1033
1034 void
1035 in_pcbinswildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1036 {
1037         struct inpcontainer *ic;
1038         struct inpcontainerhead *bucket;
1039
1040         bucket = &pcbinfo->wildcardhashbase[
1041             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1042
1043         ic = malloc(sizeof(struct inpcontainer), M_TEMP, M_INTWAIT);
1044         ic->ic_inp = inp;
1045         LIST_INSERT_HEAD(bucket, ic, ic_list);
1046 }
1047
1048 /*
1049  * Insert PCB into wildcard hash table.
1050  */
1051 void
1052 in_pcbinswildcardhash(struct inpcb *inp)
1053 {
1054         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1055
1056         KKASSERT(pcbinfo != NULL);
1057
1058         in_pcbinswildcardhash_oncpu(inp, pcbinfo);
1059         inp->inp_flags |= INP_WILDCARD;
1060 }
1061
1062 void
1063 in_pcbremwildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1064 {
1065         struct inpcontainer *ic;
1066         struct inpcontainerhead *head;
1067
1068         /* find bucket */
1069         head = &pcbinfo->wildcardhashbase[
1070             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1071
1072         LIST_FOREACH(ic, head, ic_list) {
1073                 if (ic->ic_inp == inp)
1074                         goto found;
1075         }
1076         return;                 /* not found! */
1077
1078 found:
1079         LIST_REMOVE(ic, ic_list);       /* remove container from bucket chain */
1080         free(ic, M_TEMP);               /* deallocate container */
1081 }
1082
1083 /*
1084  * Remove PCB from wildcard hash table.
1085  */
1086 void
1087 in_pcbremwildcardhash(struct inpcb *inp)
1088 {
1089         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1090
1091         KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard"));
1092         in_pcbremwildcardhash_oncpu(inp, pcbinfo);
1093         inp->inp_flags &= ~INP_WILDCARD;
1094 }
1095
1096 /*
1097  * Remove PCB from various lists.
1098  */
1099 void
1100 in_pcbremlists(struct inpcb *inp)
1101 {
1102         if (inp->inp_lport) {
1103                 struct inpcbport *phd = inp->inp_phd;
1104
1105                 LIST_REMOVE(inp, inp_portlist);
1106                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1107                         LIST_REMOVE(phd, phd_hash);
1108                         free(phd, M_PCB);
1109                 }
1110         }
1111         if (inp->inp_flags & INP_WILDCARD) {
1112                 in_pcbremwildcardhash(inp);
1113         } else if (inp->inp_flags & INP_CONNECTED) {
1114                 in_pcbremconnhash(inp);
1115         }
1116         LIST_REMOVE(inp, inp_list);
1117         inp->inp_pcbinfo->ipi_count--;
1118 }
1119
1120 int
1121 prison_xinpcb(struct thread *td, struct inpcb *inp)
1122 {
1123         struct ucred *cr;
1124
1125         if (td->td_proc == NULL)
1126                 return (0);
1127         cr = td->td_proc->p_ucred;
1128         if (cr->cr_prison == NULL)
1129                 return (0);
1130         if (ntohl(inp->inp_laddr.s_addr) == cr->cr_prison->pr_ip)
1131                 return (0);
1132         return (1);
1133 }
1134
1135 int
1136 in_pcblist_global(SYSCTL_HANDLER_ARGS)
1137 {
1138         struct inpcbinfo *pcbinfo = arg1;
1139         struct inpcb *inp, *marker;
1140         struct xinpcb xi;
1141         int error, i, n;
1142         inp_gen_t gencnt;
1143
1144         /*
1145          * The process of preparing the TCB list is too time-consuming and
1146          * resource-intensive to repeat twice on every request.
1147          */
1148         if (req->oldptr == NULL) {
1149                 n = pcbinfo->ipi_count;
1150                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1151                 return 0;
1152         }
1153
1154         if (req->newptr != NULL)
1155                 return EPERM;
1156
1157         /*
1158          * OK, now we're committed to doing something.  Re-fetch ipi_count
1159          * after obtaining the generation count.
1160          */
1161         gencnt = pcbinfo->ipi_gencnt;
1162         n = pcbinfo->ipi_count;
1163
1164         marker = malloc(sizeof(struct inpcb), M_TEMP, M_WAITOK|M_ZERO);
1165         marker->inp_flags |= INP_PLACEMARKER;
1166         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
1167
1168         i = 0;
1169         error = 0;
1170
1171         while ((inp = LIST_NEXT(marker, inp_list)) != NULL && i < n) {
1172                 LIST_REMOVE(marker, inp_list);
1173                 LIST_INSERT_AFTER(inp, marker, inp_list);
1174
1175                 if (inp->inp_flags & INP_PLACEMARKER)
1176                         continue;
1177                 if (inp->inp_gencnt > gencnt)
1178                         continue;
1179                 if (prison_xinpcb(req->td, inp))
1180                         continue;
1181                 bzero(&xi, sizeof xi);
1182                 xi.xi_len = sizeof xi;
1183                 bcopy(inp, &xi.xi_inp, sizeof *inp);
1184                 if (inp->inp_socket)
1185                         sotoxsocket(inp->inp_socket, &xi.xi_socket);
1186                 if ((error = SYSCTL_OUT(req, &xi, sizeof xi)) != 0)
1187                         break;
1188                 ++i;
1189         }
1190         LIST_REMOVE(marker, inp_list);
1191         if (error == 0 && i < n) {
1192                 bzero(&xi, sizeof xi);
1193                 xi.xi_len = sizeof xi;
1194                 while (i < n) {
1195                         error = SYSCTL_OUT(req, &xi, sizeof xi);
1196                         ++i;
1197                 }
1198         }
1199         free(marker, M_TEMP);
1200         return(error);
1201 }