sys/netinet/in_pcb.c

   1 /*
   2  * Copyright (c) 1982, 1986, 1991, 1993, 1995
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
  34  * $FreeBSD: src/sys/netinet/in_pcb.c,v 1.59.2.27 2004/01/02 04:06:42 ambrisko Exp $
  35  * $DragonFly: src/sys/netinet/in_pcb.c,v 1.10 2004/02/27 09:40:36 hsu Exp $
  36  */
  37
  38 #include "opt_ipsec.h"
  39 #include "opt_inet6.h"
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/malloc.h>
  44 #include <sys/mbuf.h>
  45 #include <sys/domain.h>
  46 #include <sys/protosw.h>
  47 #include <sys/socket.h>
  48 #include <sys/socketvar.h>
  49 #include <sys/proc.h>
  50 #include <sys/jail.h>
  51 #include <sys/kernel.h>
  52 #include <sys/sysctl.h>
  53
  54 #include <machine/limits.h>
  55
  56 #include <vm/vm_zone.h>
  57
  58 #include <net/if.h>
  59 #include <net/if_types.h>
  60 #include <net/route.h>
  61
  62 #include <netinet/in.h>
  63 #include <netinet/in_pcb.h>
  64 #include <netinet/in_var.h>
  65 #include <netinet/ip_var.h>
  66 #ifdef INET6
  67 #include <netinet/ip6.h>
  68 #include <netinet6/ip6_var.h>
  69 #endif /* INET6 */
  70
  71 #ifdef IPSEC
  72 #include <netinet6/ipsec.h>
  73 #include <netproto/key/key.h>
  74 #endif
  75
  76 #ifdef FAST_IPSEC
  77 #if defined(IPSEC) || defined(IPSEC_ESP)
  78 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
  79 #endif
  80
  81 #include <netipsec/ipsec.h>
  82 #include <netipsec/key.h>
  83 #define IPSEC
  84 #endif /* FAST_IPSEC */
  85
  86 struct in_addr zeroin_addr;
  87
  88 /*
  89  * These configure the range of local port addresses assigned to
  90  * "unspecified" outgoing connections/packets/whatever.
  91  */
  92 int ipport_lowfirstauto = IPPORT_RESERVED - 1;  /* 1023 */
  93 int ipport_lowlastauto = IPPORT_RESERVEDSTART;  /* 600 */
  94
  95 int ipport_firstauto = IPPORT_RESERVED;         /* 1024 */
  96 int ipport_lastauto = IPPORT_USERRESERVED;      /* 5000 */
  97
  98 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO;    /* 49152 */
  99 int ipport_hilastauto = IPPORT_HILASTAUTO;      /* 65535 */
 100
 101 static __inline void
 102 RANGECHK(int var, int min, int max)
 103 {
 104         if (var < min)
 105                 var = min;
 106         else if (var > max)
 107                 var = max;
 108 }
 109
 110 static int
 111 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 112 {
 113         int error;
 114
 115         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 116         if (!error) {
 117                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 118                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 119                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
 120                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
 121                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
 122                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
 123         }
 124         return (error);
 125 }
 126
 127 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 128
 129 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
 130            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
 131 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
 132            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
 133 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
 134            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
 135 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
 136            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
 137 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
 138            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
 139 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
 140            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
 141
 142 /*
 143  * in_pcb.c: manage the Protocol Control Blocks.
 144  *
 145  * NOTE: It is assumed that most of these functions will be called at
 146  * splnet(). XXX - There are, unfortunately, a few exceptions to this
 147  * rule that should be fixed.
 148  */
 149
 150 /*
 151  * Allocate a PCB and associate it with the socket.
 152  */
 153 int
 154 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo, struct thread *td)
 155 {
 156         struct inpcb *inp;
 157 #ifdef IPSEC
 158         int error;
 159 #endif
 160
 161         inp = zalloc(pcbinfo->ipi_zone);
 162         if (inp == NULL)
 163                 return (ENOBUFS);
 164         bzero((caddr_t)inp, sizeof *inp);
 165         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 166         inp->inp_pcbinfo = pcbinfo;
 167         inp->inp_socket = so;
 168 #ifdef IPSEC
 169         error = ipsec_init_policy(so, &inp->inp_sp);
 170         if (error != 0) {
 171                 zfree(pcbinfo->ipi_zone, inp);
 172                 return (error);
 173         }
 174 #endif
 175 #ifdef INET6
 176         if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only)
 177                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
 178         if (ip6_auto_flowlabel)
 179                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 180 #endif
 181         LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
 182         pcbinfo->ipi_count++;
 183         so->so_pcb = (caddr_t)inp;
 184         return (0);
 185 }
 186
 187 int
 188 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 189 {
 190         struct socket *so = inp->inp_socket;
 191         struct proc *p = td->td_proc;
 192         unsigned short *lastport;
 193         struct sockaddr_in *sin;
 194         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 195         u_short lport = 0;
 196         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 197         int error, prison = 0;
 198
 199         KKASSERT(p);
 200
 201         if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
 202                 return (EADDRNOTAVAIL);
 203         if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY)
 204                 return (EINVAL);
 205         if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT)))
 206                 wild = 1;
 207         if (nam) {
 208                 sin = (struct sockaddr_in *)nam;
 209                 if (nam->sa_len != sizeof *sin)
 210                         return (EINVAL);
 211 #ifdef notdef
 212                 /*
 213                  * We should check the family, but old programs
 214                  * incorrectly fail to initialize it.
 215                  */
 216                 if (sin->sin_family != AF_INET)
 217                         return (EAFNOSUPPORT);
 218 #endif
 219                 if (sin->sin_addr.s_addr != INADDR_ANY)
 220                         if (prison_ip(td, 0, &sin->sin_addr.s_addr))
 221                                 return (EINVAL);
 222                 lport = sin->sin_port;
 223                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 224                         /*
 225                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 226                          * allow complete duplication of binding if
 227                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 228                          * and a multicast address is bound on both
 229                          * new and duplicated sockets.
 230                          */
 231                         if (so->so_options & SO_REUSEADDR)
 232                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 233                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 234                         sin->sin_port = 0;              /* yech... */
 235                         bzero(&sin->sin_zero, sizeof sin->sin_zero);
 236                         if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL)
 237                                 return (EADDRNOTAVAIL);
 238                 }
 239                 if (lport) {
 240                         struct inpcb *t;
 241
 242                         /* GROSS */
 243                         if (ntohs(lport) < IPPORT_RESERVED && p &&
 244                             suser_cred(p->p_ucred, PRISON_ROOT))
 245                                 return (EACCES);
 246                         if (p && p->p_ucred->cr_prison)
 247                                 prison = 1;
 248                         if (so->so_cred->cr_uid != 0 &&
 249                             !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 250                                 t = in_pcblookup_local(inp->inp_pcbinfo,
 251                                     sin->sin_addr, lport,
 252                                     prison ? 0 : INPLOOKUP_WILDCARD);
 253                                 if (t &&
 254                                     (!in_nullhost(sin->sin_addr) ||
 255                                      !in_nullhost(t->inp_laddr) ||
 256                                      (t->inp_socket->so_options &
 257                                          SO_REUSEPORT) == 0) &&
 258                                     (so->so_cred->cr_uid !=
 259                                      t->inp_socket->so_cred->cr_uid)) {
 260 #ifdef INET6
 261                                         if (!in_nullhost(sin->sin_addr) ||
 262                                             !in_nullhost(t->inp_laddr) ||
 263                                             INP_SOCKAF(so) ==
 264                                             INP_SOCKAF(t->inp_socket))
 265 #endif
 266                                         return (EADDRINUSE);
 267                                 }
 268                         }
 269                         if (prison && prison_ip(td, 0, &sin->sin_addr.s_addr))
 270                                 return (EADDRNOTAVAIL);
 271                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 272                             lport, prison ? 0 : wild);
 273                         if (t && !(reuseport & t->inp_socket->so_options)) {
 274 #ifdef INET6
 275                                 if (!in_nullhost(sin->sin_addr) ||
 276                                     !in_nullhost(t->inp_laddr) ||
 277                                     INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
 278 #endif
 279                                 return (EADDRINUSE);
 280                         }
 281                 }
 282                 inp->inp_laddr = sin->sin_addr;
 283         }
 284         if (lport == 0) {
 285                 ushort first, last;
 286                 int count;
 287
 288                 if (inp->inp_laddr.s_addr != INADDR_ANY)
 289                         if (prison_ip(td, 0, &inp->inp_laddr.s_addr )) {
 290                                 inp->inp_laddr.s_addr = INADDR_ANY;
 291                                 return (EINVAL);
 292                         }
 293                 inp->inp_flags |= INP_ANONPORT;
 294
 295                 if (inp->inp_flags & INP_HIGHPORT) {
 296                         first = ipport_hifirstauto;     /* sysctl */
 297                         last  = ipport_hilastauto;
 298                         lastport = &pcbinfo->lasthi;
 299                 } else if (inp->inp_flags & INP_LOWPORT) {
 300                         if (p &&
 301                             (error = suser_cred(p->p_ucred, PRISON_ROOT))) {
 302                                 inp->inp_laddr.s_addr = INADDR_ANY;
 303                                 return (error);
 304                         }
 305                         first = ipport_lowfirstauto;    /* 1023 */
 306                         last  = ipport_lowlastauto;     /* 600 */
 307                         lastport = &pcbinfo->lastlow;
 308                 } else {
 309                         first = ipport_firstauto;       /* sysctl */
 310                         last  = ipport_lastauto;
 311                         lastport = &pcbinfo->lastport;
 312                 }
 313                 /*
 314                  * Simple check to ensure all ports are not used up causing
 315                  * a deadlock here.
 316                  *
 317                  * We split the two cases (up and down) so that the direction
 318                  * is not being tested on each round of the loop.
 319                  */
 320                 if (first > last) {
 321                         /*
 322                          * counting down
 323                          */
 324                         count = first - last;
 325
 326                         do {
 327                                 if (count-- < 0) {      /* completely used? */
 328                                         inp->inp_laddr.s_addr = INADDR_ANY;
 329                                         return (EADDRNOTAVAIL);
 330                                 }
 331                                 --*lastport;
 332                                 if (*lastport > first || *lastport < last)
 333                                         *lastport = first;
 334                                 lport = htons(*lastport);
 335                         } while (in_pcblookup_local(pcbinfo,
 336                                  inp->inp_laddr, lport, wild));
 337                 } else {
 338                         /*
 339                          * counting up
 340                          */
 341                         count = last - first;
 342
 343                         do {
 344                                 if (count-- < 0) {      /* completely used? */
 345                                         inp->inp_laddr.s_addr = INADDR_ANY;
 346                                         return (EADDRNOTAVAIL);
 347                                 }
 348                                 ++*lastport;
 349                                 if (*lastport < first || *lastport > last)
 350                                         *lastport = first;
 351                                 lport = htons(*lastport);
 352                         } while (in_pcblookup_local(pcbinfo,
 353                                  inp->inp_laddr, lport, wild));
 354                 }
 355         }
 356         inp->inp_lport = lport;
 357         if (prison_ip(td, 0, &inp->inp_laddr.s_addr)) {
 358                 inp->inp_laddr.s_addr = INADDR_ANY;
 359                 inp->inp_lport = 0;
 360                 return (EINVAL);
 361         }
 362         if (in_pcbinshash(inp) != 0) {
 363                 inp->inp_laddr.s_addr = INADDR_ANY;
 364                 inp->inp_lport = 0;
 365                 return (EAGAIN);
 366         }
 367         return (0);
 368 }
 369
 370 /*
 371  *   Transform old in_pcbconnect() into an inner subroutine for new
 372  *   in_pcbconnect(): Do some validity-checking on the remote
 373  *   address (in mbuf 'nam') and then determine local host address
 374  *   (i.e., which interface) to use to access that remote host.
 375  *
 376  *   This preserves definition of in_pcbconnect(), while supporting a
 377  *   slightly different version for T/TCP.  (This is more than
 378  *   a bit of a kludge, but cleaning up the internal interfaces would
 379  *   have forced minor changes in every protocol).
 380  */
 381
 382 int
 383 in_pcbladdr(inp, nam, plocal_sin)
 384         struct inpcb *inp;
 385         struct sockaddr *nam;
 386         struct sockaddr_in **plocal_sin;
 387 {
 388         struct in_ifaddr *ia;
 389         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 390
 391         if (nam->sa_len != sizeof *sin)
 392                 return (EINVAL);
 393         if (sin->sin_family != AF_INET)
 394                 return (EAFNOSUPPORT);
 395         if (sin->sin_port == 0)
 396                 return (EADDRNOTAVAIL);
 397         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 398                 ia = TAILQ_FIRST(&in_ifaddrhead);
 399                 /*
 400                  * If the destination address is INADDR_ANY,
 401                  * use the primary local address.
 402                  * If the supplied address is INADDR_BROADCAST,
 403                  * and the primary interface supports broadcast,
 404                  * choose the broadcast address for that interface.
 405                  */
 406                 if (sin->sin_addr.s_addr == INADDR_ANY)
 407                         sin->sin_addr = IA_SIN(ia)->sin_addr;
 408                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
 409                     (ia->ia_ifp->if_flags & IFF_BROADCAST))
 410                         sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
 411         }
 412         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 413                 struct route *ro;
 414
 415                 ia = (struct in_ifaddr *)NULL;
 416                 /*
 417                  * If route is known or can be allocated now,
 418                  * our src addr is taken from the i/f, else punt.
 419                  * Note that we should check the address family of the cached
 420                  * destination, in case of sharing the cache with IPv6.
 421                  */
 422                 ro = &inp->inp_route;
 423                 if (ro->ro_rt &&
 424                     (!(ro->ro_rt->rt_flags & RTF_UP) ||
 425                      ro->ro_dst.sa_family != AF_INET ||
 426                      satosin(&ro->ro_dst)->sin_addr.s_addr !=
 427                          sin->sin_addr.s_addr ||
 428                      inp->inp_socket->so_options & SO_DONTROUTE)) {
 429                         RTFREE(ro->ro_rt);
 430                         ro->ro_rt = (struct rtentry *)NULL;
 431                 }
 432                 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 433                     (ro->ro_rt == (struct rtentry *)NULL ||
 434                     ro->ro_rt->rt_ifp == (struct ifnet *)NULL)) {
 435                         /* No route yet, so try to acquire one */
 436                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 437                         ro->ro_dst.sa_family = AF_INET;
 438                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 439                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
 440                                 sin->sin_addr;
 441                         rtalloc(ro);
 442                 }
 443                 /*
 444                  * If we found a route, use the address
 445                  * corresponding to the outgoing interface
 446                  * unless it is the loopback (in case a route
 447                  * to our address on another net goes to loopback).
 448                  */
 449                 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
 450                         ia = ifatoia(ro->ro_rt->rt_ifa);
 451                 if (ia == NULL) {
 452                         u_short fport = sin->sin_port;
 453
 454                         sin->sin_port = 0;
 455                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
 456                         if (ia == NULL)
 457                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
 458                         sin->sin_port = fport;
 459                         if (ia == NULL)
 460                                 ia = TAILQ_FIRST(&in_ifaddrhead);
 461                         if (ia == NULL)
 462                                 return (EADDRNOTAVAIL);
 463                 }
 464                 /*
 465                  * If the destination address is multicast and an outgoing
 466                  * interface has been set as a multicast option, use the
 467                  * address of that interface as our source address.
 468                  */
 469                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 470                     inp->inp_moptions != NULL) {
 471                         struct ip_moptions *imo;
 472                         struct ifnet *ifp;
 473
 474                         imo = inp->inp_moptions;
 475                         if (imo->imo_multicast_ifp != NULL) {
 476                                 ifp = imo->imo_multicast_ifp;
 477                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
 478                                         if (ia->ia_ifp == ifp)
 479                                                 break;
 480                                 if (ia == NULL)
 481                                         return (EADDRNOTAVAIL);
 482                         }
 483                 }
 484                 /*
 485                  * Don't do pcblookup call here; return interface in plocal_sin
 486                  * and exit to caller, that will do the lookup.
 487                  */
 488                 *plocal_sin = &ia->ia_addr;
 489
 490         }
 491         return (0);
 492 }
 493
 494 /*
 495  * Outer subroutine:
 496  * Connect from a socket to a specified address.
 497  * Both address and port must be specified in argument sin.
 498  * If don't have a local address for this socket yet,
 499  * then pick one.
 500  */
 501 int
 502 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 503 {
 504         struct sockaddr_in *ifaddr;
 505         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 506         struct sockaddr_in sa;
 507         struct ucred *cr = td->td_proc ? td->td_proc->p_ucred : NULL;
 508         int error;
 509
 510         if (in_nullhost(inp->inp_laddr) && cr && cr->cr_prison != NULL) {
 511                 bzero(&sa, sizeof sa);
 512                 sa.sin_addr.s_addr = htonl(cr->cr_prison->pr_ip);
 513                 sa.sin_len = sizeof sa;
 514                 sa.sin_family = AF_INET;
 515                 error = in_pcbbind(inp, (struct sockaddr *)&sa, td);
 516                 if (error)
 517                         return (error);
 518         }
 519
 520         /* Call inner routine to assign local interface address. */
 521         if ((error = in_pcbladdr(inp, nam, &ifaddr)) != 0)
 522                 return (error);
 523
 524         if (in_pcblookup_hash(inp->inp_pcbinfo, sin->sin_addr, sin->sin_port,
 525             inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
 526             inp->inp_lport, FALSE, NULL) != NULL) {
 527                 return (EADDRINUSE);
 528         }
 529         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 530                 if (inp->inp_lport == 0) {
 531                         error = in_pcbbind(inp, (struct sockaddr *)0, td);
 532                         if (error)
 533                                 return (error);
 534                 }
 535                 inp->inp_laddr = ifaddr->sin_addr;
 536         }
 537         inp->inp_faddr = sin->sin_addr;
 538         inp->inp_fport = sin->sin_port;
 539         in_pcbrehash(inp);
 540         return (0);
 541 }
 542
 543 void
 544 in_pcbdisconnect(inp)
 545         struct inpcb *inp;
 546 {
 547
 548         inp->inp_faddr.s_addr = INADDR_ANY;
 549         inp->inp_fport = 0;
 550         in_pcbrehash(inp);
 551         if (inp->inp_socket->so_state & SS_NOFDREF)
 552                 in_pcbdetach(inp);
 553 }
 554
 555 void
 556 in_pcbdetach(inp)
 557         struct inpcb *inp;
 558 {
 559         struct socket *so = inp->inp_socket;
 560         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 561
 562 #ifdef IPSEC
 563         ipsec4_delete_pcbpolicy(inp);
 564 #endif /*IPSEC*/
 565         inp->inp_gencnt = ++ipi->ipi_gencnt;
 566         in_pcbremlists(inp);
 567         so->so_pcb = 0;
 568         sofree(so);
 569         if (inp->inp_options)
 570                 (void)m_free(inp->inp_options);
 571         if (inp->inp_route.ro_rt)
 572                 rtfree(inp->inp_route.ro_rt);
 573         ip_freemoptions(inp->inp_moptions);
 574         inp->inp_vflag = 0;
 575         zfree(ipi->ipi_zone, inp);
 576 }
 577
 578 /*
 579  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
 580  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 581  * in struct pr_usrreqs, so that protocols can just reference then directly
 582  * without the need for a wrapper function.  The socket must have a valid
 583  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 584  * except through a kernel programming error, so it is acceptable to panic
 585  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 586  * because there actually /is/ a programming error somewhere... XXX)
 587  */
 588 int
 589 in_setsockaddr(so, nam)
 590         struct socket *so;
 591         struct sockaddr **nam;
 592 {
 593         int s;
 594         struct inpcb *inp;
 595         struct sockaddr_in *sin;
 596
 597         /*
 598          * Do the malloc first in case it blocks.
 599          */
 600         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 601                 M_WAITOK | M_ZERO);
 602         sin->sin_family = AF_INET;
 603         sin->sin_len = sizeof *sin;
 604
 605         s = splnet();
 606         inp = sotoinpcb(so);
 607         if (!inp) {
 608                 splx(s);
 609                 free(sin, M_SONAME);
 610                 return (ECONNRESET);
 611         }
 612         sin->sin_port = inp->inp_lport;
 613         sin->sin_addr = inp->inp_laddr;
 614         splx(s);
 615
 616         *nam = (struct sockaddr *)sin;
 617         return (0);
 618 }
 619
 620 int
 621 in_setpeeraddr(so, nam)
 622         struct socket *so;
 623         struct sockaddr **nam;
 624 {
 625         int s;
 626         struct inpcb *inp;
 627         struct sockaddr_in *sin;
 628
 629         /*
 630          * Do the malloc first in case it blocks.
 631          */
 632         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 633                 M_WAITOK | M_ZERO);
 634         sin->sin_family = AF_INET;
 635         sin->sin_len = sizeof *sin;
 636
 637         s = splnet();
 638         inp = sotoinpcb(so);
 639         if (!inp) {
 640                 splx(s);
 641                 free(sin, M_SONAME);
 642                 return (ECONNRESET);
 643         }
 644         sin->sin_port = inp->inp_fport;
 645         sin->sin_addr = inp->inp_faddr;
 646         splx(s);
 647
 648         *nam = (struct sockaddr *)sin;
 649         return (0);
 650 }
 651
 652 void
 653 in_pcbnotifyall(head, faddr, errno, notify)
 654         struct inpcbhead *head;
 655         struct in_addr faddr;
 656         void (*notify) (struct inpcb *, int);
 657 {
 658         struct inpcb *inp, *ninp;
 659         int s;
 660
 661         s = splnet();
 662         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 663                 ninp = LIST_NEXT(inp, inp_list);
 664 #ifdef INET6
 665                 if (!(inp->inp_vflag & INP_IPV4))
 666                         continue;
 667 #endif
 668                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 669                     inp->inp_socket == NULL)
 670                         continue;
 671                 (*notify)(inp, errno);
 672         }
 673         splx(s);
 674 }
 675
 676 void
 677 in_pcbpurgeif0(head, ifp)
 678         struct inpcb *head;
 679         struct ifnet *ifp;
 680 {
 681         struct inpcb *inp;
 682         struct ip_moptions *imo;
 683         int i, gap;
 684
 685         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
 686                 imo = inp->inp_moptions;
 687                 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) {
 688                         /*
 689                          * Unselect the outgoing interface if it is being
 690                          * detached.
 691                          */
 692                         if (imo->imo_multicast_ifp == ifp)
 693                                 imo->imo_multicast_ifp = NULL;
 694
 695                         /*
 696                          * Drop multicast group membership if we joined
 697                          * through the interface being detached.
 698                          */
 699                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 700                             i++) {
 701                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 702                                         in_delmulti(imo->imo_membership[i]);
 703                                         gap++;
 704                                 } else if (gap != 0)
 705                                         imo->imo_membership[i - gap] =
 706                                             imo->imo_membership[i];
 707                         }
 708                         imo->imo_num_memberships -= gap;
 709                 }
 710         }
 711 }
 712
 713 /*
 714  * Check for alternatives when higher level complains
 715  * about service problems.  For now, invalidate cached
 716  * routing information.  If the route was created dynamically
 717  * (by a redirect), time to try a default gateway again.
 718  */
 719 void
 720 in_losing(inp)
 721         struct inpcb *inp;
 722 {
 723         struct rtentry *rt;
 724         struct rt_addrinfo info;
 725
 726         if ((rt = inp->inp_route.ro_rt)) {
 727                 bzero((caddr_t)&info, sizeof info);
 728                 info.rti_flags = rt->rt_flags;
 729                 info.rti_info[RTAX_DST] = rt_key(rt);
 730                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 731                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 732                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
 733                 if (rt->rt_flags & RTF_DYNAMIC)
 734                         (void) rtrequest1(RTM_DELETE, &info, NULL);
 735                 inp->inp_route.ro_rt = NULL;
 736                 rtfree(rt);
 737                 /*
 738                  * A new route can be allocated
 739                  * the next time output is attempted.
 740                  */
 741         }
 742 }
 743
 744 /*
 745  * After a routing change, flush old routing
 746  * and allocate a (hopefully) better one.
 747  */
 748 void
 749 in_rtchange(inp, errno)
 750         struct inpcb *inp;
 751         int errno;
 752 {
 753         if (inp->inp_route.ro_rt) {
 754                 rtfree(inp->inp_route.ro_rt);
 755                 inp->inp_route.ro_rt = 0;
 756                 /*
 757                  * A new route can be allocated the next time
 758                  * output is attempted.
 759                  */
 760         }
 761 }
 762
 763 /*
 764  * Lookup a PCB based on the local address and port.
 765  */
 766 struct inpcb *
 767 in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
 768         struct inpcbinfo *pcbinfo;
 769         struct in_addr laddr;
 770         u_int lport_arg;
 771         int wild_okay;
 772 {
 773         struct inpcb *inp;
 774         int matchwild = 3, wildcard;
 775         u_short lport = lport_arg;
 776
 777         if (!wild_okay) {
 778                 struct inpcbhead *head;
 779                 /*
 780                  * Look for an unconnected (wildcard foreign addr) PCB that
 781                  * matches the local address and port we're looking for.
 782                  */
 783                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
 784                 LIST_FOREACH(inp, head, inp_hash) {
 785 #ifdef INET6
 786                         if ((inp->inp_vflag & INP_IPV4) == 0)
 787                                 continue;
 788 #endif
 789                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 790                             inp->inp_laddr.s_addr == laddr.s_addr &&
 791                             inp->inp_lport == lport) {
 792                                 /*
 793                                  * Found.
 794                                  */
 795                                 return (inp);
 796                         }
 797                 }
 798                 /*
 799                  * Not found.
 800                  */
 801                 return (NULL);
 802         } else {
 803                 struct inpcbporthead *porthash;
 804                 struct inpcbport *phd;
 805                 struct inpcb *match = NULL;
 806                 /*
 807                  * Best fit PCB lookup.
 808                  *
 809                  * First see if this local port is in use by looking on the
 810                  * port hash list.
 811                  */
 812                 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 813                     pcbinfo->porthashmask)];
 814                 LIST_FOREACH(phd, porthash, phd_hash) {
 815                         if (phd->phd_port == lport)
 816                                 break;
 817                 }
 818                 if (phd != NULL) {
 819                         /*
 820                          * Port is in use by one or more PCBs. Look for best
 821                          * fit.
 822                          */
 823                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 824                                 wildcard = 0;
 825 #ifdef INET6
 826                                 if ((inp->inp_vflag & INP_IPV4) == 0)
 827                                         continue;
 828 #endif
 829                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
 830                                         wildcard++;
 831                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
 832                                         if (laddr.s_addr == INADDR_ANY)
 833                                                 wildcard++;
 834                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
 835                                                 continue;
 836                                 } else {
 837                                         if (laddr.s_addr != INADDR_ANY)
 838                                                 wildcard++;
 839                                 }
 840                                 if (wildcard < matchwild) {
 841                                         match = inp;
 842                                         matchwild = wildcard;
 843                                         if (matchwild == 0) {
 844                                                 break;
 845                                         }
 846                                 }
 847                         }
 848                 }
 849                 return (match);
 850         }
 851 }
 852
 853 /*
 854  * Lookup PCB in hash list.
 855  */
 856 struct inpcb *
 857 in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
 858         struct inpcbinfo *pcbinfo;
 859         struct in_addr faddr, laddr;
 860         u_int fport_arg, lport_arg;
 861         boolean_t wildcard;
 862         struct ifnet *ifp;
 863 {
 864         struct inpcbhead *head;
 865         struct inpcb *inp;
 866         u_short fport = fport_arg, lport = lport_arg;
 867
 868         /*
 869          * First look for an exact match.
 870          */
 871         head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
 872             pcbinfo->hashmask)];
 873         LIST_FOREACH(inp, head, inp_hash) {
 874 #ifdef INET6
 875                 if (!(inp->inp_vflag & INP_IPV4))
 876                         continue;
 877 #endif
 878                 if (in_hosteq(inp->inp_faddr, faddr) &&
 879                     in_hosteq(inp->inp_laddr, laddr) &&
 880                     inp->inp_fport == fport && inp->inp_lport == lport) {
 881                         /* found */
 882                         return (inp);
 883                 }
 884         }
 885
 886         if (wildcard) {
 887                 struct inpcb *local_wild = NULL;
 888 #ifdef INET6
 889                 struct inpcb *local_wild_mapped = NULL;
 890 #endif
 891
 892                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
 893                     pcbinfo->hashmask)];
 894                 LIST_FOREACH(inp, head, inp_hash) {
 895 #ifdef INET6
 896                         if (!(inp->inp_vflag & INP_IPV4))
 897                                 continue;
 898 #endif
 899                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 900                             inp->inp_lport == lport) {
 901                                 if (ifp && ifp->if_type == IFT_FAITH &&
 902                                     !(inp->inp_flags & INP_FAITH))
 903                                         continue;
 904                                 if (inp->inp_laddr.s_addr == laddr.s_addr)
 905                                         return (inp);
 906                                 else if (inp->inp_laddr.s_addr == INADDR_ANY) {
 907 #ifdef INET6
 908                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
 909                                                              AF_INET6))
 910                                                 local_wild_mapped = inp;
 911                                         else
 912 #endif
 913                                                 local_wild = inp;
 914                                 }
 915                         }
 916                 }
 917 #ifdef INET6
 918                 if (local_wild == NULL)
 919                         return (local_wild_mapped);
 920 #endif
 921                 return (local_wild);
 922         }
 923
 924         /*
 925          * Not found.
 926          */
 927         return (NULL);
 928 }
 929
 930 /*
 931  * Insert PCB onto various hash lists.
 932  */
 933 int
 934 in_pcbinshash(inp)
 935         struct inpcb *inp;
 936 {
 937         struct inpcbhead *pcbhash;
 938         struct inpcbporthead *pcbporthash;
 939         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 940         struct inpcbport *phd;
 941         u_int32_t hashkey_faddr;
 942
 943 #ifdef INET6
 944         if (inp->inp_vflag & INP_IPV6)
 945                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
 946         else
 947 #endif
 948                 hashkey_faddr = inp->inp_faddr.s_addr;
 949
 950         pcbhash = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
 951             inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
 952         pcbporthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(inp->inp_lport,
 953             pcbinfo->porthashmask)];
 954
 955         /* Go through port list and look for a head for this lport. */
 956         LIST_FOREACH(phd, pcbporthash, phd_hash)
 957                 if (phd->phd_port == inp->inp_lport)
 958                         break;
 959
 960         /* If none exists, malloc one and tack it on. */
 961         if (phd == NULL) {
 962                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport),
 963                     M_PCB, M_NOWAIT);
 964                 if (phd == NULL)
 965                         return (ENOBUFS); /* XXX */
 966                 phd->phd_port = inp->inp_lport;
 967                 LIST_INIT(&phd->phd_pcblist);
 968                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
 969         }
 970
 971         inp->inp_phd = phd;
 972         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
 973         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
 974         return (0);
 975 }
 976
 977 /*
 978  * Move PCB to the proper hash bucket when { faddr, fport } have  been
 979  * changed. NOTE: This does not handle the case of the lport changing (the
 980  * hashed port list would have to be updated as well), so the lport must
 981  * not change after in_pcbinshash() has been called.
 982  */
 983 void
 984 in_pcbrehash(inp)
 985         struct inpcb *inp;
 986 {
 987         struct inpcbhead *head;
 988         u_int32_t hashkey_faddr;
 989
 990 #ifdef INET6
 991         if (inp->inp_vflag & INP_IPV6)
 992                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
 993         else
 994 #endif
 995                 hashkey_faddr = inp->inp_faddr.s_addr;
 996
 997         head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
 998             inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];
 999
1000         LIST_REMOVE(inp, inp_hash);
1001         LIST_INSERT_HEAD(head, inp, inp_hash);
1002 }
1003
1004 /*
1005  * Remove PCB from various lists.
1006  */
1007 void
1008 in_pcbremlists(inp)
1009         struct inpcb *inp;
1010 {
1011         inp->inp_gencnt = ++inp->inp_pcbinfo->ipi_gencnt;
1012         if (inp->inp_lport) {
1013                 struct inpcbport *phd = inp->inp_phd;
1014
1015                 LIST_REMOVE(inp, inp_hash);
1016                 LIST_REMOVE(inp, inp_portlist);
1017                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1018                         LIST_REMOVE(phd, phd_hash);
1019                         free(phd, M_PCB);
1020                 }
1021         }
1022         LIST_REMOVE(inp, inp_list);
1023         inp->inp_pcbinfo->ipi_count--;
1024 }
1025
1026 int
1027 prison_xinpcb(struct thread *td, struct inpcb *inp)
1028 {
1029         struct ucred *cr;
1030
1031         if (td->td_proc == NULL)
1032                 return (0);
1033         cr = td->td_proc->p_ucred;
1034         if (cr->cr_prison == NULL)
1035                 return (0);
1036         if (ntohl(inp->inp_laddr.s_addr) == cr->cr_prison->pr_ip)
1037                 return (0);
1038         return (1);
1039 }