sys/netinet/in_pcb.c

   1 /*
   2  * cOPyright (c) 2004 Jeffrey M. Hsu.  All rights reserved.
   3  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to The DragonFly Project
   6  * by Jeffrey M. Hsu.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of The DragonFly Project nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific, prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  28  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1991, 1993, 1995
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
  67  * $FreeBSD: src/sys/netinet/in_pcb.c,v 1.59.2.27 2004/01/02 04:06:42 ambrisko Exp $
  68  * $DragonFly: src/sys/netinet/in_pcb.c,v 1.43 2007/03/04 18:51:59 swildner Exp $
  69  */
  70
  71 #include "opt_ipsec.h"
  72 #include "opt_inet6.h"
  73
  74 #include <sys/param.h>
  75 #include <sys/systm.h>
  76 #include <sys/malloc.h>
  77 #include <sys/mbuf.h>
  78 #include <sys/domain.h>
  79 #include <sys/protosw.h>
  80 #include <sys/socket.h>
  81 #include <sys/socketvar.h>
  82 #include <sys/proc.h>
  83 #include <sys/jail.h>
  84 #include <sys/kernel.h>
  85 #include <sys/sysctl.h>
  86 #include <sys/thread2.h>
  87
  88 #include <machine/limits.h>
  89
  90 #include <vm/vm_zone.h>
  91
  92 #include <net/if.h>
  93 #include <net/if_types.h>
  94 #include <net/route.h>
  95
  96 #include <netinet/in.h>
  97 #include <netinet/in_pcb.h>
  98 #include <netinet/in_var.h>
  99 #include <netinet/ip_var.h>
 100 #ifdef INET6
 101 #include <netinet/ip6.h>
 102 #include <netinet6/ip6_var.h>
 103 #endif /* INET6 */
 104
 105 #ifdef IPSEC
 106 #include <netinet6/ipsec.h>
 107 #include <netproto/key/key.h>
 108 #endif
 109
 110 #ifdef FAST_IPSEC
 111 #if defined(IPSEC) || defined(IPSEC_ESP)
 112 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
 113 #endif
 114
 115 #include <netproto/ipsec/ipsec.h>
 116 #include <netproto/ipsec/key.h>
 117 #define IPSEC
 118 #endif /* FAST_IPSEC */
 119
 120 struct in_addr zeroin_addr;
 121
 122 /*
 123  * These configure the range of local port addresses assigned to
 124  * "unspecified" outgoing connections/packets/whatever.
 125  */
 126 int ipport_lowfirstauto = IPPORT_RESERVED - 1;  /* 1023 */
 127 int ipport_lowlastauto = IPPORT_RESERVEDSTART;  /* 600 */
 128
 129 int ipport_firstauto = IPPORT_RESERVED;         /* 1024 */
 130 int ipport_lastauto = IPPORT_USERRESERVED;      /* 5000 */
 131
 132 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO;    /* 49152 */
 133 int ipport_hilastauto = IPPORT_HILASTAUTO;      /* 65535 */
 134
 135 static __inline void
 136 RANGECHK(int var, int min, int max)
 137 {
 138         if (var < min)
 139                 var = min;
 140         else if (var > max)
 141                 var = max;
 142 }
 143
 144 static int
 145 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 146 {
 147         int error;
 148
 149         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 150         if (!error) {
 151                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 152                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 153
 154                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
 155                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
 156
 157                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
 158                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
 159         }
 160         return (error);
 161 }
 162
 163 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 164
 165 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
 166            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
 167 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
 168            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
 169 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
 170            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
 171 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
 172            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
 173 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
 174            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
 175 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
 176            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
 177
 178 /*
 179  * in_pcb.c: manage the Protocol Control Blocks.
 180  *
 181  * NOTE: It is assumed that most of these functions will be called from
 182  * a critical section.  XXX - There are, unfortunately, a few exceptions
 183  * to this rule that should be fixed.
 184  *
 185  * NOTE: The caller should initialize the cpu field to the cpu running the
 186  * protocol stack associated with this inpcbinfo.
 187  */
 188
 189 void
 190 in_pcbinfo_init(struct inpcbinfo *pcbinfo)
 191 {
 192         LIST_INIT(&pcbinfo->pcblisthead);
 193         pcbinfo->cpu = -1;
 194 }
 195
 196 /*
 197  * Allocate a PCB and associate it with the socket.
 198  */
 199 int
 200 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 201 {
 202         struct inpcb *inp;
 203 #ifdef IPSEC
 204         int error;
 205 #endif
 206
 207         inp = zalloc(pcbinfo->ipi_zone);
 208         if (inp == NULL)
 209                 return (ENOBUFS);
 210         bzero(inp, sizeof *inp);
 211         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 212         inp->inp_pcbinfo = inp->inp_cpcbinfo = pcbinfo;
 213         inp->inp_socket = so;
 214 #ifdef IPSEC
 215         error = ipsec_init_policy(so, &inp->inp_sp);
 216         if (error != 0) {
 217                 zfree(pcbinfo->ipi_zone, inp);
 218                 return (error);
 219         }
 220 #endif
 221 #ifdef INET6
 222         if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only)
 223                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
 224         if (ip6_auto_flowlabel)
 225                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 226 #endif
 227         so->so_pcb = inp;
 228         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
 229         pcbinfo->ipi_count++;
 230         return (0);
 231 }
 232
 233 int
 234 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 235 {
 236         struct socket *so = inp->inp_socket;
 237         struct proc *p = td->td_proc;
 238         unsigned short *lastport;
 239         struct sockaddr_in *sin;
 240         struct sockaddr_in jsin;
 241         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 242         struct ucred *cred = NULL;
 243         u_short lport = 0;
 244         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 245         int error;
 246
 247         KKASSERT(p);
 248
 249         if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
 250                 return (EADDRNOTAVAIL);
 251         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 252                 return (EINVAL);        /* already bound */
 253         if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT)))
 254                 wild = 1;    /* neither SO_REUSEADDR nor SO_REUSEPORT is set */
 255         if (p)
 256                 cred = p->p_ucred;
 257         if (nam != NULL) {
 258                 sin = (struct sockaddr_in *)nam;
 259                 if (nam->sa_len != sizeof *sin)
 260                         return (EINVAL);
 261 #ifdef notdef
 262                 /*
 263                  * We should check the family, but old programs
 264                  * incorrectly fail to initialize it.
 265                  */
 266                 if (sin->sin_family != AF_INET)
 267                         return (EAFNOSUPPORT);
 268 #endif
 269                 if (!prison_replace_wildcards(td, nam))
 270                                 return (EINVAL);
 271                 lport = sin->sin_port;
 272                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 273                         /*
 274                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 275                          * allow complete duplication of binding if
 276                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 277                          * and a multicast address is bound on both
 278                          * new and duplicated sockets.
 279                          */
 280                         if (so->so_options & SO_REUSEADDR)
 281                                 reuseport = SO_REUSEADDR | SO_REUSEPORT;
 282                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 283                         sin->sin_port = 0;              /* yech... */
 284                         bzero(&sin->sin_zero, sizeof sin->sin_zero);
 285                         if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL)
 286                                 return (EADDRNOTAVAIL);
 287                 }
 288                 if (lport != 0) {
 289                         struct inpcb *t;
 290
 291                         /* GROSS */
 292                         if (ntohs(lport) < IPPORT_RESERVED &&
 293                             cred && suser_cred(cred, PRISON_ROOT))
 294                                 return (EACCES);
 295                         if (so->so_cred->cr_uid != 0 &&
 296                             !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 297                                 t = in_pcblookup_local(inp->inp_pcbinfo,
 298                                     sin->sin_addr, lport,
 299                                     INPLOOKUP_WILDCARD, cred);
 300                                 if (t &&
 301                                     (!in_nullhost(sin->sin_addr) ||
 302                                      !in_nullhost(t->inp_laddr) ||
 303                                      (t->inp_socket->so_options &
 304                                          SO_REUSEPORT) == 0) &&
 305                                     (so->so_cred->cr_uid !=
 306                                      t->inp_socket->so_cred->cr_uid)) {
 307 #ifdef INET6
 308                                         if (!in_nullhost(sin->sin_addr) ||
 309                                             !in_nullhost(t->inp_laddr) ||
 310                                             INP_SOCKAF(so) ==
 311                                             INP_SOCKAF(t->inp_socket))
 312 #endif
 313                                         return (EADDRINUSE);
 314                                 }
 315                         }
 316                         if (cred && !prison_replace_wildcards(td, nam))
 317                                 return (EADDRNOTAVAIL);
 318                         t = in_pcblookup_local(pcbinfo, sin->sin_addr, lport,
 319                                                wild, cred);
 320                         if (t && !(reuseport & t->inp_socket->so_options)) {
 321 #ifdef INET6
 322                                 if (!in_nullhost(sin->sin_addr) ||
 323                                     !in_nullhost(t->inp_laddr) ||
 324                                     INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
 325 #endif
 326                                 return (EADDRINUSE);
 327                         }
 328                 }
 329                 inp->inp_laddr = sin->sin_addr;
 330         }
 331         if (lport == 0) {
 332                 ushort first, last;
 333                 int count;
 334
 335                 jsin.sin_family = AF_INET;
 336                 jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 337                 if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
 338                         inp->inp_laddr.s_addr = INADDR_ANY;
 339                         return (EINVAL);
 340                 }
 341                 inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 342
 343                 inp->inp_flags |= INP_ANONPORT;
 344
 345                 if (inp->inp_flags & INP_HIGHPORT) {
 346                         first = ipport_hifirstauto;     /* sysctl */
 347                         last  = ipport_hilastauto;
 348                         lastport = &pcbinfo->lasthi;
 349                 } else if (inp->inp_flags & INP_LOWPORT) {
 350                         if (cred &&
 351                             (error = suser_cred(cred, PRISON_ROOT))) {
 352                                 inp->inp_laddr.s_addr = INADDR_ANY;
 353                                 return (error);
 354                         }
 355                         first = ipport_lowfirstauto;    /* 1023 */
 356                         last  = ipport_lowlastauto;     /* 600 */
 357                         lastport = &pcbinfo->lastlow;
 358                 } else {
 359                         first = ipport_firstauto;       /* sysctl */
 360                         last  = ipport_lastauto;
 361                         lastport = &pcbinfo->lastport;
 362                 }
 363                 /*
 364                  * Simple check to ensure all ports are not used up causing
 365                  * a deadlock here.
 366                  *
 367                  * We split the two cases (up and down) so that the direction
 368                  * is not being tested on each round of the loop.
 369                  */
 370                 if (first > last) {
 371                         /*
 372                          * counting down
 373                          */
 374                         count = first - last;
 375
 376                         do {
 377                                 if (count-- < 0) {      /* completely used? */
 378                                         inp->inp_laddr.s_addr = INADDR_ANY;
 379                                         return (EADDRNOTAVAIL);
 380                                 }
 381                                 --*lastport;
 382                                 if (*lastport > first || *lastport < last)
 383                                         *lastport = first;
 384                                 lport = htons(*lastport);
 385                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
 386                                  lport, wild, cred));
 387                 } else {
 388                         /*
 389                          * counting up
 390                          */
 391                         count = last - first;
 392
 393                         do {
 394                                 if (count-- < 0) {      /* completely used? */
 395                                         inp->inp_laddr.s_addr = INADDR_ANY;
 396                                         return (EADDRNOTAVAIL);
 397                                 }
 398                                 ++*lastport;
 399                                 if (*lastport < first || *lastport > last)
 400                                         *lastport = first;
 401                                 lport = htons(*lastport);
 402                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
 403                                  lport, wild, cred));
 404                 }
 405         }
 406         inp->inp_lport = lport;
 407
 408         jsin.sin_family = AF_INET;
 409         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 410         if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin)) {
 411                 inp->inp_laddr.s_addr = INADDR_ANY;
 412                 inp->inp_lport = 0;
 413                 return (EINVAL);
 414         }
 415         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 416
 417         if (in_pcbinsporthash(inp) != 0) {
 418                 inp->inp_laddr.s_addr = INADDR_ANY;
 419                 inp->inp_lport = 0;
 420                 return (EAGAIN);
 421         }
 422         return (0);
 423 }
 424
 425 /*
 426  *   Transform old in_pcbconnect() into an inner subroutine for new
 427  *   in_pcbconnect(): Do some validity-checking on the remote
 428  *   address (in mbuf 'nam') and then determine local host address
 429  *   (i.e., which interface) to use to access that remote host.
 430  *
 431  *   This preserves definition of in_pcbconnect(), while supporting a
 432  *   slightly different version for T/TCP.  (This is more than
 433  *   a bit of a kludge, but cleaning up the internal interfaces would
 434  *   have forced minor changes in every protocol).
 435  */
 436 int
 437 in_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 438         struct sockaddr_in **plocal_sin, struct thread *td)
 439 {
 440         struct in_ifaddr *ia;
 441         struct ucred *cred = NULL;
 442         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 443         struct sockaddr *jsin;
 444         int jailed = 0;
 445
 446         if (nam->sa_len != sizeof *sin)
 447                 return (EINVAL);
 448         if (sin->sin_family != AF_INET)
 449                 return (EAFNOSUPPORT);
 450         if (sin->sin_port == 0)
 451                 return (EADDRNOTAVAIL);
 452         if (td && td->td_proc && td->td_proc->p_ucred)
 453                 cred = td->td_proc->p_ucred;
 454         if (cred && cred->cr_prison)
 455                 jailed = 1;
 456         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 457                 ia = TAILQ_FIRST(&in_ifaddrhead);
 458                 /*
 459                  * If the destination address is INADDR_ANY,
 460                  * use the primary local address.
 461                  * If the supplied address is INADDR_BROADCAST,
 462                  * and the primary interface supports broadcast,
 463                  * choose the broadcast address for that interface.
 464                  */
 465                 if (sin->sin_addr.s_addr == INADDR_ANY)
 466                         sin->sin_addr = IA_SIN(ia)->sin_addr;
 467                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
 468                     (ia->ia_ifp->if_flags & IFF_BROADCAST))
 469                         sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
 470         }
 471         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 472                 struct route *ro;
 473
 474                 ia = (struct in_ifaddr *)NULL;
 475                 /*
 476                  * If route is known or can be allocated now,
 477                  * our src addr is taken from the i/f, else punt.
 478                  * Note that we should check the address family of the cached
 479                  * destination, in case of sharing the cache with IPv6.
 480                  */
 481                 ro = &inp->inp_route;
 482                 if (ro->ro_rt &&
 483                     (!(ro->ro_rt->rt_flags & RTF_UP) ||
 484                      ro->ro_dst.sa_family != AF_INET ||
 485                      satosin(&ro->ro_dst)->sin_addr.s_addr !=
 486                                       sin->sin_addr.s_addr ||
 487                      inp->inp_socket->so_options & SO_DONTROUTE)) {
 488                         RTFREE(ro->ro_rt);
 489                         ro->ro_rt = (struct rtentry *)NULL;
 490                 }
 491                 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 492                     (ro->ro_rt == (struct rtentry *)NULL ||
 493                     ro->ro_rt->rt_ifp == (struct ifnet *)NULL)) {
 494                         /* No route yet, so try to acquire one */
 495                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 496                         ro->ro_dst.sa_family = AF_INET;
 497                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 498                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
 499                                 sin->sin_addr;
 500                         rtalloc(ro);
 501                 }
 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                         if (jailed) {
 510                                 if (jailed_ip(cred->cr_prison,
 511                                     ro->ro_rt->rt_ifa->ifa_addr)) {
 512                                         ia = ifatoia(ro->ro_rt->rt_ifa);
 513                                 }
 514                         } else {
 515                                 ia = ifatoia(ro->ro_rt->rt_ifa);
 516                         }
 517                 }
 518                 if (ia == NULL) {
 519                         u_short fport = sin->sin_port;
 520
 521                         sin->sin_port = 0;
 522                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
 523                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 524                             sintosa(&ia->ia_addr)))
 525                                 ia = NULL;
 526                         if (ia == NULL)
 527                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
 528                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 529                             sintosa(&ia->ia_addr)))
 530                                 ia = NULL;
 531                         sin->sin_port = fport;
 532                         if (ia == NULL)
 533                                 ia = TAILQ_FIRST(&in_ifaddrhead);
 534                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 535                             sintosa(&ia->ia_addr)))
 536                                 ia = NULL;
 537
 538                         if (!jailed && ia == NULL)
 539                                 return (EADDRNOTAVAIL);
 540                 }
 541                 /*
 542                  * If the destination address is multicast and an outgoing
 543                  * interface has been set as a multicast option, use the
 544                  * address of that interface as our source address.
 545                  */
 546                 if (!jailed && IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 547                     inp->inp_moptions != NULL) {
 548                         struct ip_moptions *imo;
 549                         struct ifnet *ifp;
 550
 551                         imo = inp->inp_moptions;
 552                         if (imo->imo_multicast_ifp != NULL) {
 553                                 ifp = imo->imo_multicast_ifp;
 554                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
 555                                         if (ia->ia_ifp == ifp)
 556                                                 break;
 557                                 if (ia == NULL)
 558                                         return (EADDRNOTAVAIL);
 559                         }
 560                 }
 561                 /*
 562                  * Don't do pcblookup call here; return interface in plocal_sin
 563                  * and exit to caller, that will do the lookup.
 564                  */
 565                 if (ia == NULL && jailed) {
 566                         if ((jsin = prison_get_nonlocal(cred->cr_prison, AF_INET, NULL)) != NULL ||
 567                             (jsin = prison_get_local(cred->cr_prison, AF_INET, NULL)) != NULL)
 568                                 *plocal_sin = satosin(jsin);
 569                         else
 570                                 /* IPv6 only Jail */
 571                                 return (EADDRNOTAVAIL);
 572                 } else {
 573                         *plocal_sin = &ia->ia_addr;
 574                 }
 575         }
 576         return (0);
 577 }
 578
 579 /*
 580  * Outer subroutine:
 581  * Connect from a socket to a specified address.
 582  * Both address and port must be specified in argument sin.
 583  * If don't have a local address for this socket yet,
 584  * then pick one.
 585  */
 586 int
 587 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 588 {
 589         struct sockaddr_in *if_sin;
 590         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 591         int error;
 592
 593         /* Call inner routine to assign local interface address. */
 594         if ((error = in_pcbladdr(inp, nam, &if_sin, td)) != 0)
 595                 return (error);
 596
 597         if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port,
 598             inp->inp_laddr.s_addr ? inp->inp_laddr : if_sin->sin_addr,
 599             inp->inp_lport, FALSE, NULL) != NULL) {
 600                 return (EADDRINUSE);
 601         }
 602         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 603                 if (inp->inp_lport == 0) {
 604                         error = in_pcbbind(inp, (struct sockaddr *)NULL, td);
 605                         if (error)
 606                                 return (error);
 607                 }
 608                 inp->inp_laddr = if_sin->sin_addr;
 609         }
 610         inp->inp_faddr = sin->sin_addr;
 611         inp->inp_fport = sin->sin_port;
 612         in_pcbinsconnhash(inp);
 613         return (0);
 614 }
 615
 616 void
 617 in_pcbdisconnect(struct inpcb *inp)
 618 {
 619
 620         inp->inp_faddr.s_addr = INADDR_ANY;
 621         inp->inp_fport = 0;
 622         in_pcbremconnhash(inp);
 623         if (inp->inp_socket->so_state & SS_NOFDREF)
 624                 in_pcbdetach(inp);
 625 }
 626
 627 void
 628 in_pcbdetach(struct inpcb *inp)
 629 {
 630         struct socket *so = inp->inp_socket;
 631         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 632
 633 #ifdef IPSEC
 634         ipsec4_delete_pcbpolicy(inp);
 635 #endif /*IPSEC*/
 636         inp->inp_gencnt = ++ipi->ipi_gencnt;
 637         in_pcbremlists(inp);
 638         so->so_pcb = 0;
 639         sofree(so);
 640         if (inp->inp_options)
 641                 m_free(inp->inp_options);
 642         if (inp->inp_route.ro_rt)
 643                 rtfree(inp->inp_route.ro_rt);
 644         ip_freemoptions(inp->inp_moptions);
 645         inp->inp_vflag = 0;
 646         zfree(ipi->ipi_zone, inp);
 647 }
 648
 649 /*
 650  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
 651  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 652  * in struct pr_usrreqs, so that protocols can just reference then directly
 653  * without the need for a wrapper function.  The socket must have a valid
 654  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 655  * except through a kernel programming error, so it is acceptable to panic
 656  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 657  * because there actually /is/ a programming error somewhere... XXX)
 658  */
 659 int
 660 in_setsockaddr(struct socket *so, struct sockaddr **nam)
 661 {
 662         struct inpcb *inp;
 663         struct sockaddr_in *sin;
 664
 665         /*
 666          * Do the malloc first in case it blocks.
 667          */
 668         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 669                 M_WAITOK | M_ZERO);
 670         sin->sin_family = AF_INET;
 671         sin->sin_len = sizeof *sin;
 672
 673         crit_enter();
 674         inp = so->so_pcb;
 675         if (!inp) {
 676                 crit_exit();
 677                 kfree(sin, M_SONAME);
 678                 return (ECONNRESET);
 679         }
 680         sin->sin_port = inp->inp_lport;
 681         sin->sin_addr = inp->inp_laddr;
 682         crit_exit();
 683
 684         *nam = (struct sockaddr *)sin;
 685         return (0);
 686 }
 687
 688 int
 689 in_setpeeraddr(struct socket *so, struct sockaddr **nam)
 690 {
 691         struct inpcb *inp;
 692         struct sockaddr_in *sin;
 693
 694         /*
 695          * Do the malloc first in case it blocks.
 696          */
 697         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 698                 M_WAITOK | M_ZERO);
 699         sin->sin_family = AF_INET;
 700         sin->sin_len = sizeof *sin;
 701
 702         crit_enter();
 703         inp = so->so_pcb;
 704         if (!inp) {
 705                 crit_exit();
 706                 kfree(sin, M_SONAME);
 707                 return (ECONNRESET);
 708         }
 709         sin->sin_port = inp->inp_fport;
 710         sin->sin_addr = inp->inp_faddr;
 711         crit_exit();
 712
 713         *nam = (struct sockaddr *)sin;
 714         return (0);
 715 }
 716
 717 void
 718 in_pcbnotifyall(struct inpcbhead *head, struct in_addr faddr, int err,
 719                 void (*notify)(struct inpcb *, int))
 720 {
 721         struct inpcb *inp, *ninp;
 722
 723         /*
 724          * note: if INP_PLACEMARKER is set we must ignore the rest of
 725          * the structure and skip it.
 726          */
 727         crit_enter();
 728         LIST_FOREACH_MUTABLE(inp, head, inp_list, ninp) {
 729                 if (inp->inp_flags & INP_PLACEMARKER)
 730                         continue;
 731 #ifdef INET6
 732                 if (!(inp->inp_vflag & INP_IPV4))
 733                         continue;
 734 #endif
 735                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 736                     inp->inp_socket == NULL)
 737                         continue;
 738                 (*notify)(inp, err);            /* can remove inp from list! */
 739         }
 740         crit_exit();
 741 }
 742
 743 void
 744 in_pcbpurgeif0(struct inpcb *head, struct ifnet *ifp)
 745 {
 746         struct inpcb *inp;
 747         struct ip_moptions *imo;
 748         int i, gap;
 749
 750         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
 751                 if (inp->inp_flags & INP_PLACEMARKER)
 752                         continue;
 753                 imo = inp->inp_moptions;
 754                 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) {
 755                         /*
 756                          * Unselect the outgoing interface if it is being
 757                          * detached.
 758                          */
 759                         if (imo->imo_multicast_ifp == ifp)
 760                                 imo->imo_multicast_ifp = NULL;
 761
 762                         /*
 763                          * Drop multicast group membership if we joined
 764                          * through the interface being detached.
 765                          */
 766                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 767                             i++) {
 768                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 769                                         in_delmulti(imo->imo_membership[i]);
 770                                         gap++;
 771                                 } else if (gap != 0)
 772                                         imo->imo_membership[i - gap] =
 773                                             imo->imo_membership[i];
 774                         }
 775                         imo->imo_num_memberships -= gap;
 776                 }
 777         }
 778 }
 779
 780 /*
 781  * Check for alternatives when higher level complains
 782  * about service problems.  For now, invalidate cached
 783  * routing information.  If the route was created dynamically
 784  * (by a redirect), time to try a default gateway again.
 785  */
 786 void
 787 in_losing(struct inpcb *inp)
 788 {
 789         struct rtentry *rt;
 790         struct rt_addrinfo rtinfo;
 791
 792         if ((rt = inp->inp_route.ro_rt)) {
 793                 bzero(&rtinfo, sizeof(struct rt_addrinfo));
 794                 rtinfo.rti_info[RTAX_DST] = rt_key(rt);
 795                 rtinfo.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 796                 rtinfo.rti_info[RTAX_NETMASK] = rt_mask(rt);
 797                 rtinfo.rti_flags = rt->rt_flags;
 798                 rt_missmsg(RTM_LOSING, &rtinfo, rt->rt_flags, 0);
 799                 if (rt->rt_flags & RTF_DYNAMIC)
 800                         rtrequest1_global(RTM_DELETE, &rtinfo, NULL, NULL);
 801                 inp->inp_route.ro_rt = NULL;
 802                 rtfree(rt);
 803                 /*
 804                  * A new route can be allocated
 805                  * the next time output is attempted.
 806                  */
 807         }
 808 }
 809
 810 /*
 811  * After a routing change, flush old routing
 812  * and allocate a (hopefully) better one.
 813  */
 814 void
 815 in_rtchange(struct inpcb *inp, int err)
 816 {
 817         if (inp->inp_route.ro_rt) {
 818                 rtfree(inp->inp_route.ro_rt);
 819                 inp->inp_route.ro_rt = NULL;
 820                 /*
 821                  * A new route can be allocated the next time
 822                  * output is attempted.
 823                  */
 824         }
 825 }
 826
 827 /*
 828  * Lookup a PCB based on the local address and port.
 829  */
 830 struct inpcb *
 831 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 832                    u_int lport_arg, int wild_okay, struct ucred *cred)
 833 {
 834         struct inpcb *inp;
 835         int matchwild = 3, wildcard;
 836         u_short lport = lport_arg;
 837
 838         struct inpcbporthead *porthash;
 839         struct inpcbport *phd;
 840         struct inpcb *match = NULL;
 841
 842         /*
 843          * Best fit PCB lookup.
 844          *
 845          * First see if this local port is in use by looking on the
 846          * port hash list.
 847          */
 848         porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 849             pcbinfo->porthashmask)];
 850         LIST_FOREACH(phd, porthash, phd_hash) {
 851                 if (phd->phd_port == lport)
 852                         break;
 853         }
 854         if (phd != NULL) {
 855                 /*
 856                  * Port is in use by one or more PCBs. Look for best
 857                  * fit.
 858                  */
 859                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 860                         wildcard = 0;
 861 #ifdef INET6
 862                         if ((inp->inp_vflag & INP_IPV4) == 0)
 863                                 continue;
 864 #endif
 865                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 866                                 wildcard++;
 867                         if (inp->inp_laddr.s_addr != INADDR_ANY) {
 868                                 if (laddr.s_addr == INADDR_ANY)
 869                                         wildcard++;
 870                                 else if (inp->inp_laddr.s_addr != laddr.s_addr)
 871                                         continue;
 872                         } else {
 873                                 if (laddr.s_addr != INADDR_ANY)
 874                                         wildcard++;
 875                         }
 876                         if (wildcard && !wild_okay)
 877                                 continue;
 878                         if (wildcard < matchwild &&
 879                             (cred == NULL ||
 880                              cred->cr_prison ==
 881                                         inp->inp_socket->so_cred->cr_prison)) {
 882                                 match = inp;
 883                                 matchwild = wildcard;
 884                                 if (matchwild == 0) {
 885                                         break;
 886                                 }
 887                         }
 888                 }
 889         }
 890         return (match);
 891 }
 892
 893 /*
 894  * Lookup PCB in hash list.
 895  */
 896 struct inpcb *
 897 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport_arg,
 898                   struct in_addr laddr, u_int lport_arg, boolean_t wildcard,
 899                   struct ifnet *ifp)
 900 {
 901         struct inpcbhead *head;
 902         struct inpcb *inp, *jinp=NULL;
 903         u_short fport = fport_arg, lport = lport_arg;
 904
 905         /*
 906          * First look for an exact match.
 907          */
 908         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport,
 909             laddr.s_addr, lport, pcbinfo->hashmask)];
 910         LIST_FOREACH(inp, head, inp_hash) {
 911 #ifdef INET6
 912                 if (!(inp->inp_vflag & INP_IPV4))
 913                         continue;
 914 #endif
 915                 if (in_hosteq(inp->inp_faddr, faddr) &&
 916                     in_hosteq(inp->inp_laddr, laddr) &&
 917                     inp->inp_fport == fport && inp->inp_lport == lport) {
 918                         /* found */
 919                         if (inp->inp_socket == NULL ||
 920                             inp->inp_socket->so_cred->cr_prison == NULL) {
 921                                 return (inp);
 922                         } else {
 923                                 if  (jinp == NULL)
 924                                         jinp = inp;
 925                         }
 926                 }
 927         }
 928         if (jinp != NULL)
 929                 return (jinp);
 930         if (wildcard) {
 931                 struct inpcb *local_wild = NULL;
 932                 struct inpcb *jinp_wild = NULL;
 933 #ifdef INET6
 934                 struct inpcb *local_wild_mapped = NULL;
 935 #endif
 936                 struct inpcontainer *ic;
 937                 struct inpcontainerhead *chead;
 938                 struct sockaddr_in jsin;
 939                 struct ucred *cred;
 940
 941                 /*
 942                  * Order of socket selection:
 943                  * 1. non-jailed, non-wild.
 944                  * 2. non-jailed, wild.
 945                  * 3. jailed, non-wild.
 946                  * 4. jailed, wild.
 947                  */
 948                 jsin.sin_family = AF_INET;
 949                 chead = &pcbinfo->wildcardhashbase[
 950                     INP_PCBWILDCARDHASH(lport, pcbinfo->wildcardhashmask)];
 951                 LIST_FOREACH(ic, chead, ic_list) {
 952                         inp = ic->ic_inp;
 953                         jsin.sin_addr.s_addr = laddr.s_addr;
 954 #ifdef INET6
 955                         if (!(inp->inp_vflag & INP_IPV4))
 956                                 continue;
 957 #endif
 958                         if (inp->inp_socket != NULL)
 959                                 cred = inp->inp_socket->so_cred;
 960                         else
 961                                 cred = NULL;
 962                         if (cred != NULL && jailed(cred)) {
 963                                 if (jinp != NULL)
 964                                         continue;
 965                                 else
 966                                         if (!jailed_ip(cred->cr_prison,
 967                                             (struct sockaddr *)&jsin))
 968                                                 continue;
 969                         }
 970                         if (inp->inp_lport == lport) {
 971                                 if (ifp && ifp->if_type == IFT_FAITH &&
 972                                     !(inp->inp_flags & INP_FAITH))
 973                                         continue;
 974                                 if (inp->inp_laddr.s_addr == laddr.s_addr) {
 975                                         if (cred != NULL && jailed(cred))
 976                                                 jinp = inp;
 977                                         else
 978                                                 return (inp);
 979                                 }
 980                                 if (inp->inp_laddr.s_addr == INADDR_ANY) {
 981 #ifdef INET6
 982                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
 983                                                              AF_INET6))
 984                                                 local_wild_mapped = inp;
 985                                         else
 986 #endif
 987                                                 if (cred != NULL &&
 988                                                     jailed(cred))
 989                                                         jinp_wild = inp;
 990                                                 else
 991                                                         local_wild = inp;
 992                                 }
 993                         }
 994                 }
 995                 if (local_wild != NULL)
 996                         return (local_wild);
 997 #ifdef INET6
 998                 if (local_wild_mapped != NULL)
 999                         return (local_wild_mapped);
1000 #endif
1001                 if (jinp != NULL)
1002                         return (jinp);
1003                 return (jinp_wild);
1004         }
1005
1006         /*
1007          * Not found.
1008          */
1009         return (NULL);
1010 }
1011
1012 /*
1013  * Insert PCB into connection hash table.
1014  */
1015 void
1016 in_pcbinsconnhash(struct inpcb *inp)
1017 {
1018         struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo;
1019         struct inpcbhead *bucket;
1020         u_int32_t hashkey_faddr, hashkey_laddr;
1021
1022 #ifdef INET6
1023         if (inp->inp_vflag & INP_IPV6) {
1024                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */;
1025                 hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */;
1026         } else {
1027 #endif
1028                 hashkey_faddr = inp->inp_faddr.s_addr;
1029                 hashkey_laddr = inp->inp_laddr.s_addr;
1030 #ifdef INET6
1031         }
1032 #endif
1033
1034         KASSERT(!(inp->inp_flags & INP_CONNECTED), ("already on hash list"));
1035         inp->inp_flags |= INP_CONNECTED;
1036
1037         /*
1038          * Insert into the connection hash table.
1039          */
1040         bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr,
1041             inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)];
1042         LIST_INSERT_HEAD(bucket, inp, inp_hash);
1043 }
1044
1045 /*
1046  * Remove PCB from connection hash table.
1047  */
1048 void
1049 in_pcbremconnhash(struct inpcb *inp)
1050 {
1051         KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected"));
1052         LIST_REMOVE(inp, inp_hash);
1053         inp->inp_flags &= ~INP_CONNECTED;
1054 }
1055
1056 /*
1057  * Insert PCB into port hash table.
1058  */
1059 int
1060 in_pcbinsporthash(struct inpcb *inp)
1061 {
1062         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1063         struct inpcbporthead *pcbporthash;
1064         struct inpcbport *phd;
1065
1066         /*
1067          * Insert into the port hash table.
1068          */
1069         pcbporthash = &pcbinfo->porthashbase[
1070             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->porthashmask)];
1071
1072         /* Go through port list and look for a head for this lport. */
1073         LIST_FOREACH(phd, pcbporthash, phd_hash)
1074                 if (phd->phd_port == inp->inp_lport)
1075                         break;
1076
1077         /* If none exists, malloc one and tack it on. */
1078         if (phd == NULL) {
1079                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport),
1080                     M_PCB, M_INTWAIT | M_NULLOK);
1081                 if (phd == NULL)
1082                         return (ENOBUFS); /* XXX */
1083                 phd->phd_port = inp->inp_lport;
1084                 LIST_INIT(&phd->phd_pcblist);
1085                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1086         }
1087
1088         inp->inp_phd = phd;
1089         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1090
1091         return (0);
1092 }
1093
1094 void
1095 in_pcbinswildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1096 {
1097         struct inpcontainer *ic;
1098         struct inpcontainerhead *bucket;
1099
1100         bucket = &pcbinfo->wildcardhashbase[
1101             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1102
1103         ic = kmalloc(sizeof(struct inpcontainer), M_TEMP, M_INTWAIT);
1104         ic->ic_inp = inp;
1105         LIST_INSERT_HEAD(bucket, ic, ic_list);
1106 }
1107
1108 /*
1109  * Insert PCB into wildcard hash table.
1110  */
1111 void
1112 in_pcbinswildcardhash(struct inpcb *inp)
1113 {
1114         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1115
1116         KKASSERT(pcbinfo != NULL);
1117
1118         in_pcbinswildcardhash_oncpu(inp, pcbinfo);
1119         inp->inp_flags |= INP_WILDCARD;
1120 }
1121
1122 void
1123 in_pcbremwildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1124 {
1125         struct inpcontainer *ic;
1126         struct inpcontainerhead *head;
1127
1128         /* find bucket */
1129         head = &pcbinfo->wildcardhashbase[
1130             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1131
1132         LIST_FOREACH(ic, head, ic_list) {
1133                 if (ic->ic_inp == inp)
1134                         goto found;
1135         }
1136         return;                 /* not found! */
1137
1138 found:
1139         LIST_REMOVE(ic, ic_list);       /* remove container from bucket chain */
1140         kfree(ic, M_TEMP);              /* deallocate container */
1141 }
1142
1143 /*
1144  * Remove PCB from wildcard hash table.
1145  */
1146 void
1147 in_pcbremwildcardhash(struct inpcb *inp)
1148 {
1149         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1150
1151         KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard"));
1152         in_pcbremwildcardhash_oncpu(inp, pcbinfo);
1153         inp->inp_flags &= ~INP_WILDCARD;
1154 }
1155
1156 /*
1157  * Remove PCB from various lists.
1158  */
1159 void
1160 in_pcbremlists(struct inpcb *inp)
1161 {
1162         if (inp->inp_lport) {
1163                 struct inpcbport *phd = inp->inp_phd;
1164
1165                 LIST_REMOVE(inp, inp_portlist);
1166                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1167                         LIST_REMOVE(phd, phd_hash);
1168                         kfree(phd, M_PCB);
1169                 }
1170         }
1171         if (inp->inp_flags & INP_WILDCARD) {
1172                 in_pcbremwildcardhash(inp);
1173         } else if (inp->inp_flags & INP_CONNECTED) {
1174                 in_pcbremconnhash(inp);
1175         }
1176         LIST_REMOVE(inp, inp_list);
1177         inp->inp_pcbinfo->ipi_count--;
1178 }
1179
1180 int
1181 prison_xinpcb(struct thread *td, struct inpcb *inp)
1182 {
1183         struct ucred *cr;
1184
1185         if (td->td_proc == NULL)
1186                 return (0);
1187         cr = td->td_proc->p_ucred;
1188         if (cr->cr_prison == NULL)
1189                 return (0);
1190         if (inp->inp_socket && inp->inp_socket->so_cred &&
1191             inp->inp_socket->so_cred->cr_prison &&
1192             cr->cr_prison == inp->inp_socket->so_cred->cr_prison)
1193                 return (0);
1194         return (1);
1195 }
1196
1197 int
1198 in_pcblist_global(SYSCTL_HANDLER_ARGS)
1199 {
1200         struct inpcbinfo *pcbinfo = arg1;
1201         struct inpcb *inp, *marker;
1202         struct xinpcb xi;
1203         int error, i, n;
1204         inp_gen_t gencnt;
1205
1206         /*
1207          * The process of preparing the TCB list is too time-consuming and
1208          * resource-intensive to repeat twice on every request.
1209          */
1210         if (req->oldptr == NULL) {
1211                 n = pcbinfo->ipi_count;
1212                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1213                 return 0;
1214         }
1215
1216         if (req->newptr != NULL)
1217                 return EPERM;
1218
1219         /*
1220          * OK, now we're committed to doing something.  Re-fetch ipi_count
1221          * after obtaining the generation count.
1222          */
1223         gencnt = pcbinfo->ipi_gencnt;
1224         n = pcbinfo->ipi_count;
1225
1226         marker = kmalloc(sizeof(struct inpcb), M_TEMP, M_WAITOK|M_ZERO);
1227         marker->inp_flags |= INP_PLACEMARKER;
1228         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
1229
1230         i = 0;
1231         error = 0;
1232
1233         while ((inp = LIST_NEXT(marker, inp_list)) != NULL && i < n) {
1234                 LIST_REMOVE(marker, inp_list);
1235                 LIST_INSERT_AFTER(inp, marker, inp_list);
1236
1237                 if (inp->inp_flags & INP_PLACEMARKER)
1238                         continue;
1239                 if (inp->inp_gencnt > gencnt)
1240                         continue;
1241                 if (prison_xinpcb(req->td, inp))
1242                         continue;
1243                 bzero(&xi, sizeof xi);
1244                 xi.xi_len = sizeof xi;
1245                 bcopy(inp, &xi.xi_inp, sizeof *inp);
1246                 if (inp->inp_socket)
1247                         sotoxsocket(inp->inp_socket, &xi.xi_socket);
1248                 if ((error = SYSCTL_OUT(req, &xi, sizeof xi)) != 0)
1249                         break;
1250                 ++i;
1251         }
1252         LIST_REMOVE(marker, inp_list);
1253         if (error == 0 && i < n) {
1254                 bzero(&xi, sizeof xi);
1255                 xi.xi_len = sizeof xi;
1256                 while (i < n) {
1257                         error = SYSCTL_OUT(req, &xi, sizeof xi);
1258                         ++i;
1259                 }
1260         }
1261         kfree(marker, M_TEMP);
1262         return(error);
1263 }