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  */
  69
  70 #include "opt_ipsec.h"
  71 #include "opt_inet6.h"
  72
  73 #include <sys/param.h>
  74 #include <sys/systm.h>
  75 #include <sys/malloc.h>
  76 #include <sys/mbuf.h>
  77 #include <sys/domain.h>
  78 #include <sys/protosw.h>
  79 #include <sys/socket.h>
  80 #include <sys/socketvar.h>
  81 #include <sys/proc.h>
  82 #include <sys/priv.h>
  83 #include <sys/jail.h>
  84 #include <sys/kernel.h>
  85 #include <sys/sysctl.h>
  86
  87 #include <sys/thread2.h>
  88 #include <sys/socketvar2.h>
  89 #include <sys/msgport2.h>
  90
  91 #include <machine/limits.h>
  92
  93 #include <net/if.h>
  94 #include <net/if_types.h>
  95 #include <net/route.h>
  96
  97 #include <netinet/in.h>
  98 #include <netinet/in_pcb.h>
  99 #include <netinet/in_var.h>
 100 #include <netinet/ip_var.h>
 101 #ifdef INET6
 102 #include <netinet/ip6.h>
 103 #include <netinet6/ip6_var.h>
 104 #endif /* INET6 */
 105
 106 #ifdef IPSEC
 107 #include <netinet6/ipsec.h>
 108 #include <netproto/key/key.h>
 109 #include <netproto/ipsec/esp_var.h>
 110 #endif
 111
 112 #ifdef FAST_IPSEC
 113 #if defined(IPSEC) || defined(IPSEC_ESP)
 114 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
 115 #endif
 116
 117 #include <netproto/ipsec/ipsec.h>
 118 #include <netproto/ipsec/key.h>
 119 #define IPSEC
 120 #endif /* FAST_IPSEC */
 121
 122 struct in_addr zeroin_addr;
 123
 124 /*
 125  * These configure the range of local port addresses assigned to
 126  * "unspecified" outgoing connections/packets/whatever.
 127  */
 128 int ipport_lowfirstauto = IPPORT_RESERVED - 1;  /* 1023 */
 129 int ipport_lowlastauto = IPPORT_RESERVEDSTART;  /* 600 */
 130
 131 int ipport_firstauto = IPPORT_RESERVED;         /* 1024 */
 132 int ipport_lastauto = IPPORT_USERRESERVED;      /* 5000 */
 133
 134 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO;    /* 49152 */
 135 int ipport_hilastauto = IPPORT_HILASTAUTO;      /* 65535 */
 136
 137 #define RANGECHK(var, min, max) \
 138         if ((var) < (min)) { (var) = (min); } \
 139         else if ((var) > (max)) { (var) = (max); }
 140
 141 int udpencap_enable = 1;        /* enabled by default */
 142 int udpencap_port = 4500;       /* triggers decapsulation */
 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 #undef RANGECHK
 164
 165 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 166
 167 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
 168            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
 169 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
 170            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
 171 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
 172            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
 173 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
 174            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
 175 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
 176            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
 177 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
 178            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
 179
 180 /*
 181  * in_pcb.c: manage the Protocol Control Blocks.
 182  *
 183  * NOTE: It is assumed that most of these functions will be called from
 184  * a critical section.  XXX - There are, unfortunately, a few exceptions
 185  * to this rule that should be fixed.
 186  *
 187  * NOTE: The caller should initialize the cpu field to the cpu running the
 188  * protocol stack associated with this inpcbinfo.
 189  */
 190
 191 void
 192 in_pcbinfo_init(struct inpcbinfo *pcbinfo)
 193 {
 194         LIST_INIT(&pcbinfo->pcblisthead);
 195         pcbinfo->cpu = -1;
 196         pcbinfo->portsave = kmalloc(sizeof(*pcbinfo->portsave), M_PCB,
 197                                     M_WAITOK | M_ZERO);
 198 }
 199
 200 struct baddynamicports baddynamicports;
 201
 202 /*
 203  * Check if the specified port is invalid for dynamic allocation.
 204  */
 205 int
 206 in_baddynamic(u_int16_t port, u_int16_t proto)
 207 {
 208         switch (proto) {
 209         case IPPROTO_TCP:
 210                 return (DP_ISSET(baddynamicports.tcp, port));
 211         case IPPROTO_UDP:
 212 #ifdef IPSEC
 213                 /* Cannot preset this as it is a sysctl */
 214                 if (port == udpencap_port)
 215                         return (1);
 216 #endif
 217                 return (DP_ISSET(baddynamicports.udp, port));
 218         default:
 219                 return (0);
 220         }
 221 }
 222
 223
 224 /*
 225  * Allocate a PCB and associate it with the socket.
 226  */
 227 int
 228 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 229 {
 230         struct inpcb *inp;
 231 #ifdef IPSEC
 232         int error;
 233 #endif
 234
 235         inp = kmalloc(pcbinfo->ipi_size, M_PCB, M_WAITOK|M_ZERO);
 236         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 237         inp->inp_pcbinfo = inp->inp_cpcbinfo = pcbinfo;
 238         inp->inp_socket = so;
 239 #ifdef IPSEC
 240         error = ipsec_init_policy(so, &inp->inp_sp);
 241         if (error != 0) {
 242                 kfree(inp, M_PCB);
 243                 return (error);
 244         }
 245 #endif
 246 #ifdef INET6
 247         if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only)
 248                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
 249         if (ip6_auto_flowlabel)
 250                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 251 #endif
 252         soreference(so);
 253         so->so_pcb = inp;
 254         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
 255         pcbinfo->ipi_count++;
 256         return (0);
 257 }
 258
 259 /*
 260  * Unlink a pcb with the intention of moving it to another cpu with a
 261  * different pcbinfo.  While unlinked nothing should attempt to dereference
 262  * inp_pcbinfo, NULL it out so we assert if it does.
 263  */
 264 void
 265 in_pcbunlink(struct inpcb *inp, struct inpcbinfo *pcbinfo)
 266 {
 267         KKASSERT(inp->inp_pcbinfo == pcbinfo);
 268
 269         LIST_REMOVE(inp, inp_list);
 270         pcbinfo->ipi_count--;
 271         inp->inp_pcbinfo = NULL;
 272 }
 273
 274 /*
 275  * Relink a pcb into a new pcbinfo.
 276  */
 277 void
 278 in_pcblink(struct inpcb *inp, struct inpcbinfo *pcbinfo)
 279 {
 280         KKASSERT(inp->inp_pcbinfo == NULL);
 281         inp->inp_pcbinfo = pcbinfo;
 282         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
 283         pcbinfo->ipi_count++;
 284 }
 285
 286 int
 287 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 288 {
 289         struct socket *so = inp->inp_socket;
 290         unsigned short *lastport;
 291         struct sockaddr_in *sin;
 292         struct sockaddr_in jsin;
 293         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 294         struct ucred *cred = NULL;
 295         u_short lport = 0;
 296         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 297         int error;
 298
 299         if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) /* XXX broken! */
 300                 return (EADDRNOTAVAIL);
 301         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 302                 return (EINVAL);        /* already bound */
 303
 304         if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT)))
 305                 wild = 1;    /* neither SO_REUSEADDR nor SO_REUSEPORT is set */
 306         if (td->td_proc)
 307                 cred = td->td_proc->p_ucred;
 308
 309         /*
 310          * This has to be atomic.  If the porthash is shared across multiple
 311          * protocol threads (aka tcp) then the token will be non-NULL.
 312          */
 313         if (pcbinfo->porttoken)
 314                 lwkt_gettoken(pcbinfo->porttoken);
 315
 316         if (nam != NULL) {
 317                 sin = (struct sockaddr_in *)nam;
 318                 if (nam->sa_len != sizeof *sin) {
 319                         error = EINVAL;
 320                         goto done;
 321                 }
 322 #ifdef notdef
 323                 /*
 324                  * We should check the family, but old programs
 325                  * incorrectly fail to initialize it.
 326                  */
 327                 if (sin->sin_family != AF_INET) {
 328                         error = EAFNOSUPPORT;
 329                         goto done;
 330                 }
 331 #endif
 332                 if (!prison_replace_wildcards(td, nam)) {
 333                         error = EINVAL;
 334                         goto done;
 335                 }
 336                 lport = sin->sin_port;
 337                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 338                         /*
 339                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 340                          * allow complete duplication of binding if
 341                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 342                          * and a multicast address is bound on both
 343                          * new and duplicated sockets.
 344                          */
 345                         if (so->so_options & SO_REUSEADDR)
 346                                 reuseport = SO_REUSEADDR | SO_REUSEPORT;
 347                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 348                         sin->sin_port = 0;              /* yech... */
 349                         bzero(&sin->sin_zero, sizeof sin->sin_zero);
 350                         if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL) {
 351                                 error = EADDRNOTAVAIL;
 352                                 goto done;
 353                         }
 354                 }
 355                 if (lport != 0) {
 356                         struct inpcb *t;
 357
 358                         /* GROSS */
 359                         if (ntohs(lport) < IPPORT_RESERVED &&
 360                             cred &&
 361                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0)) {
 362                                 error = EACCES;
 363                                 goto done;
 364                         }
 365                         if (so->so_cred->cr_uid != 0 &&
 366                             !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 367                                 t = in_pcblookup_local(pcbinfo,
 368                                                        sin->sin_addr,
 369                                                        lport,
 370                                                        INPLOOKUP_WILDCARD,
 371                                                        cred);
 372                                 if (t &&
 373                                     (!in_nullhost(sin->sin_addr) ||
 374                                      !in_nullhost(t->inp_laddr) ||
 375                                      (t->inp_socket->so_options &
 376                                          SO_REUSEPORT) == 0) &&
 377                                     (so->so_cred->cr_uid !=
 378                                      t->inp_socket->so_cred->cr_uid)) {
 379 #ifdef INET6
 380                                         if (!in_nullhost(sin->sin_addr) ||
 381                                             !in_nullhost(t->inp_laddr) ||
 382                                             INP_SOCKAF(so) ==
 383                                             INP_SOCKAF(t->inp_socket))
 384 #endif
 385                                         {
 386                                                 error = EADDRINUSE;
 387                                                 goto done;
 388                                         }
 389                                 }
 390                         }
 391                         if (cred && !prison_replace_wildcards(td, nam)) {
 392                                 error = EADDRNOTAVAIL;
 393                                 goto done;
 394                         }
 395                         t = in_pcblookup_local(pcbinfo, sin->sin_addr, lport,
 396                                                wild, cred);
 397                         if (t && !(reuseport & t->inp_socket->so_options)) {
 398 #ifdef INET6
 399                                 if (!in_nullhost(sin->sin_addr) ||
 400                                     !in_nullhost(t->inp_laddr) ||
 401                                     INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
 402 #endif
 403                                 {
 404                                         error = EADDRINUSE;
 405                                         goto done;
 406                                 }
 407                         }
 408                 }
 409                 inp->inp_laddr = sin->sin_addr;
 410         }
 411         if (lport == 0) {
 412                 ushort first, last;
 413                 int count;
 414
 415                 jsin.sin_family = AF_INET;
 416                 jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 417                 if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
 418                         inp->inp_laddr.s_addr = INADDR_ANY;
 419                         error = EINVAL;
 420                         goto done;
 421                 }
 422                 inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 423
 424                 inp->inp_flags |= INP_ANONPORT;
 425
 426                 if (inp->inp_flags & INP_HIGHPORT) {
 427                         first = ipport_hifirstauto;     /* sysctl */
 428                         last  = ipport_hilastauto;
 429                         lastport = &pcbinfo->lasthi;
 430                 } else if (inp->inp_flags & INP_LOWPORT) {
 431                         if (cred &&
 432                             (error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))) {
 433                                 inp->inp_laddr.s_addr = INADDR_ANY;
 434                                 goto done;
 435                         }
 436                         first = ipport_lowfirstauto;    /* 1023 */
 437                         last  = ipport_lowlastauto;     /* 600 */
 438                         lastport = &pcbinfo->lastlow;
 439                 } else {
 440                         first = ipport_firstauto;       /* sysctl */
 441                         last  = ipport_lastauto;
 442                         lastport = &pcbinfo->lastport;
 443                 }
 444                 /*
 445                  * Simple check to ensure all ports are not used up causing
 446                  * a deadlock here.
 447                  *
 448                  * We split the two cases (up and down) so that the direction
 449                  * is not being tested on each round of the loop.
 450                  */
 451                 if (first > last) {
 452                         /*
 453                          * counting down
 454                          */
 455                         count = first - last;
 456
 457                         do {
 458                                 if (count-- < 0) {      /* completely used? */
 459                                         inp->inp_laddr.s_addr = INADDR_ANY;
 460                                         error = EADDRNOTAVAIL;
 461                                         goto done;
 462                                 }
 463                                 --*lastport;
 464                                 if (*lastport > first || *lastport < last)
 465                                         *lastport = first;
 466                                 lport = htons(*lastport);
 467                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
 468                                                     lport, wild, cred));
 469                 } else {
 470                         /*
 471                          * counting up
 472                          */
 473                         count = last - first;
 474
 475                         do {
 476                                 if (count-- < 0) {      /* completely used? */
 477                                         inp->inp_laddr.s_addr = INADDR_ANY;
 478                                         error = EADDRNOTAVAIL;
 479                                         goto done;
 480                                 }
 481                                 ++*lastport;
 482                                 if (*lastport < first || *lastport > last)
 483                                         *lastport = first;
 484                                 lport = htons(*lastport);
 485                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
 486                                                     lport, wild, cred));
 487                 }
 488         }
 489         inp->inp_lport = lport;
 490
 491         jsin.sin_family = AF_INET;
 492         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 493         if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin)) {
 494                 inp->inp_laddr.s_addr = INADDR_ANY;
 495                 inp->inp_lport = 0;
 496                 error = EINVAL;
 497                 goto done;
 498         }
 499         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 500
 501         if (in_pcbinsporthash(inp) != 0) {
 502                 inp->inp_laddr.s_addr = INADDR_ANY;
 503                 inp->inp_lport = 0;
 504                 error = EAGAIN;
 505                 goto done;
 506         }
 507         error = 0;
 508 done:
 509         if (pcbinfo->porttoken)
 510                 lwkt_reltoken(pcbinfo->porttoken);
 511         return error;
 512 }
 513
 514 static struct inpcb *
 515 in_pcblookup_addrport(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 516     u_short lport, struct in_addr faddr, u_short fport, struct ucred *cred)
 517 {
 518         struct inpcb *inp;
 519         struct inpcbporthead *porthash;
 520         struct inpcbport *phd;
 521         struct inpcb *match = NULL;
 522
 523         /*
 524          * If the porthashbase is shared across several cpus we need
 525          * to lock.
 526          */
 527         if (pcbinfo->porttoken)
 528                 lwkt_gettoken(pcbinfo->porttoken);
 529
 530         /*
 531          * Best fit PCB lookup.
 532          *
 533          * First see if this local port is in use by looking on the
 534          * port hash list.
 535          */
 536         porthash = &pcbinfo->porthashbase[
 537                         INP_PCBPORTHASH(lport, pcbinfo->porthashmask)];
 538         LIST_FOREACH(phd, porthash, phd_hash) {
 539                 if (phd->phd_port == lport)
 540                         break;
 541         }
 542         if (phd != NULL) {
 543                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 544 #ifdef INET6
 545                         if ((inp->inp_vflag & INP_IPV4) == 0)
 546                                 continue;
 547 #endif
 548                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 549                             inp->inp_laddr.s_addr != laddr.s_addr)
 550                                 continue;
 551
 552                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 553                             inp->inp_faddr.s_addr != faddr.s_addr)
 554                                 continue;
 555
 556                         if (inp->inp_fport != 0 && inp->inp_fport != fport)
 557                                 continue;
 558
 559                         if (cred == NULL ||
 560                             cred->cr_prison ==
 561                             inp->inp_socket->so_cred->cr_prison) {
 562                                 match = inp;
 563                                 break;
 564                         }
 565                 }
 566         }
 567         if (pcbinfo->porttoken)
 568                 lwkt_reltoken(pcbinfo->porttoken);
 569         return (match);
 570 }
 571
 572 int
 573 in_pcbconn_bind(struct inpcb *inp, const struct sockaddr *nam,
 574     struct thread *td)
 575 {
 576         struct proc *p = td->td_proc;
 577         unsigned short *lastport;
 578         const struct sockaddr_in *sin = (const struct sockaddr_in *)nam;
 579         struct sockaddr_in jsin;
 580         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 581         struct ucred *cred = NULL;
 582         u_short lport = 0;
 583         ushort first, last;
 584         int count, error, dup = 0;
 585
 586         if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) /* XXX broken! */
 587                 return (EADDRNOTAVAIL);
 588
 589         KKASSERT(inp->inp_laddr.s_addr != INADDR_ANY);
 590         if (inp->inp_lport != 0)
 591                 return (EINVAL);        /* already bound */
 592
 593         KKASSERT(p);
 594         cred = p->p_ucred;
 595
 596         /*
 597          * This has to be atomic.  If the porthash is shared across multiple
 598          * protocol threads (aka tcp) then the token will be non-NULL.
 599          */
 600         if (pcbinfo->porttoken)
 601                 lwkt_gettoken(pcbinfo->porttoken);
 602
 603         jsin.sin_family = AF_INET;
 604         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 605         if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
 606                 inp->inp_laddr.s_addr = INADDR_ANY;
 607                 error = EINVAL;
 608                 goto done;
 609         }
 610         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 611
 612         inp->inp_flags |= INP_ANONPORT;
 613
 614         if (inp->inp_flags & INP_HIGHPORT) {
 615                 first = ipport_hifirstauto;     /* sysctl */
 616                 last  = ipport_hilastauto;
 617                 lastport = &pcbinfo->lasthi;
 618         } else if (inp->inp_flags & INP_LOWPORT) {
 619                 if (cred &&
 620                     (error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))) {
 621                         inp->inp_laddr.s_addr = INADDR_ANY;
 622                         goto done;
 623                 }
 624                 first = ipport_lowfirstauto;    /* 1023 */
 625                 last  = ipport_lowlastauto;     /* 600 */
 626                 lastport = &pcbinfo->lastlow;
 627         } else {
 628                 first = ipport_firstauto;       /* sysctl */
 629                 last  = ipport_lastauto;
 630                 lastport = &pcbinfo->lastport;
 631         }
 632
 633 again:
 634         /*
 635          * Simple check to ensure all ports are not used up causing
 636          * a deadlock here.
 637          *
 638          * We split the two cases (up and down) so that the direction
 639          * is not being tested on each round of the loop.
 640          */
 641         if (first > last) {
 642                 /*
 643                  * counting down
 644                  */
 645                 count = first - last;
 646
 647                 do {
 648                         if (count-- < 0) {      /* completely used? */
 649                                 inp->inp_laddr.s_addr = INADDR_ANY;
 650                                 error = EADDRNOTAVAIL;
 651                                 goto done;
 652                         }
 653                         --*lastport;
 654                         if (*lastport > first || *lastport < last)
 655                                 *lastport = first;
 656                         lport = htons(*lastport);
 657                 } while (in_pcblookup_addrport(pcbinfo, inp->inp_laddr, lport,
 658                                 sin->sin_addr, sin->sin_port, cred));
 659         } else {
 660                 /*
 661                  * counting up
 662                  */
 663                 count = last - first;
 664
 665                 do {
 666                         if (count-- < 0) {      /* completely used? */
 667                                 inp->inp_laddr.s_addr = INADDR_ANY;
 668                                 error = EADDRNOTAVAIL;
 669                                 goto done;
 670                         }
 671                         ++*lastport;
 672                         if (*lastport < first || *lastport > last)
 673                                 *lastport = first;
 674                         lport = htons(*lastport);
 675                 } while (in_pcblookup_addrport(pcbinfo, inp->inp_laddr, lport,
 676                                 sin->sin_addr, sin->sin_port, cred));
 677         }
 678
 679         /* This could happen on loopback interface */
 680         if (sin->sin_port == lport &&
 681             sin->sin_addr.s_addr == inp->inp_laddr.s_addr) {
 682                 if (dup) {
 683                         /*
 684                          * Duplicate again; give up
 685                          */
 686                         inp->inp_laddr.s_addr = INADDR_ANY;
 687                         error = EADDRNOTAVAIL;
 688                         goto done;
 689                 }
 690                 dup = 1;
 691                 goto again;
 692         }
 693         inp->inp_lport = lport;
 694
 695         jsin.sin_family = AF_INET;
 696         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 697         if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin)) {
 698                 inp->inp_laddr.s_addr = INADDR_ANY;
 699                 inp->inp_lport = 0;
 700                 error = EINVAL;
 701                 goto done;
 702         }
 703         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 704
 705         if (in_pcbinsporthash(inp) != 0) {
 706                 inp->inp_laddr.s_addr = INADDR_ANY;
 707                 inp->inp_lport = 0;
 708                 error = EAGAIN;
 709                 goto done;
 710         }
 711         error = 0;
 712 done:
 713         if (pcbinfo->porttoken)
 714                 lwkt_reltoken(pcbinfo->porttoken);
 715         return error;
 716 }
 717
 718 /*
 719  *   Transform old in_pcbconnect() into an inner subroutine for new
 720  *   in_pcbconnect(): Do some validity-checking on the remote
 721  *   address (in mbuf 'nam') and then determine local host address
 722  *   (i.e., which interface) to use to access that remote host.
 723  *
 724  *   This preserves definition of in_pcbconnect(), while supporting a
 725  *   slightly different version for T/TCP.  (This is more than
 726  *   a bit of a kludge, but cleaning up the internal interfaces would
 727  *   have forced minor changes in every protocol).
 728  */
 729 int
 730 in_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 731         struct sockaddr_in **plocal_sin, struct thread *td)
 732 {
 733         struct in_ifaddr *ia;
 734         struct ucred *cred = NULL;
 735         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 736         struct sockaddr *jsin;
 737         int jailed = 0, alloc_route = 0;
 738
 739         if (nam->sa_len != sizeof *sin)
 740                 return (EINVAL);
 741         if (sin->sin_family != AF_INET)
 742                 return (EAFNOSUPPORT);
 743         if (sin->sin_port == 0)
 744                 return (EADDRNOTAVAIL);
 745         if (td && td->td_proc && td->td_proc->p_ucred)
 746                 cred = td->td_proc->p_ucred;
 747         if (cred && cred->cr_prison)
 748                 jailed = 1;
 749         if (!TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) {
 750                 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
 751                 /*
 752                  * If the destination address is INADDR_ANY,
 753                  * use the primary local address.
 754                  * If the supplied address is INADDR_BROADCAST,
 755                  * and the primary interface supports broadcast,
 756                  * choose the broadcast address for that interface.
 757                  */
 758                 if (sin->sin_addr.s_addr == INADDR_ANY)
 759                         sin->sin_addr = IA_SIN(ia)->sin_addr;
 760                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
 761                     (ia->ia_ifp->if_flags & IFF_BROADCAST))
 762                         sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
 763         }
 764         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 765                 struct route *ro;
 766
 767                 ia = NULL;
 768                 /*
 769                  * If route is known or can be allocated now,
 770                  * our src addr is taken from the i/f, else punt.
 771                  * Note that we should check the address family of the cached
 772                  * destination, in case of sharing the cache with IPv6.
 773                  */
 774                 ro = &inp->inp_route;
 775                 if (ro->ro_rt &&
 776                     (!(ro->ro_rt->rt_flags & RTF_UP) ||
 777                      ro->ro_dst.sa_family != AF_INET ||
 778                      satosin(&ro->ro_dst)->sin_addr.s_addr !=
 779                                       sin->sin_addr.s_addr ||
 780                      inp->inp_socket->so_options & SO_DONTROUTE)) {
 781                         RTFREE(ro->ro_rt);
 782                         ro->ro_rt = NULL;
 783                 }
 784                 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 785                     (ro->ro_rt == NULL ||
 786                     ro->ro_rt->rt_ifp == NULL)) {
 787                         /* No route yet, so try to acquire one */
 788                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 789                         ro->ro_dst.sa_family = AF_INET;
 790                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 791                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
 792                                 sin->sin_addr;
 793                         rtalloc(ro);
 794                         alloc_route = 1;
 795                 }
 796                 /*
 797                  * If we found a route, use the address
 798                  * corresponding to the outgoing interface
 799                  * unless it is the loopback (in case a route
 800                  * to our address on another net goes to loopback).
 801                  */
 802                 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) {
 803                         if (jailed) {
 804                                 if (jailed_ip(cred->cr_prison,
 805                                     ro->ro_rt->rt_ifa->ifa_addr)) {
 806                                         ia = ifatoia(ro->ro_rt->rt_ifa);
 807                                 }
 808                         } else {
 809                                 ia = ifatoia(ro->ro_rt->rt_ifa);
 810                         }
 811                 }
 812                 if (ia == NULL) {
 813                         u_short fport = sin->sin_port;
 814
 815                         sin->sin_port = 0;
 816                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
 817                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 818                             sintosa(&ia->ia_addr)))
 819                                 ia = NULL;
 820                         if (ia == NULL)
 821                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
 822                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 823                             sintosa(&ia->ia_addr)))
 824                                 ia = NULL;
 825                         sin->sin_port = fport;
 826                         if (ia == NULL &&
 827                             !TAILQ_EMPTY(&in_ifaddrheads[mycpuid]))
 828                                 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
 829                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 830                             sintosa(&ia->ia_addr)))
 831                                 ia = NULL;
 832
 833                         if (!jailed && ia == NULL)
 834                                 goto fail;
 835                 }
 836                 /*
 837                  * If the destination address is multicast and an outgoing
 838                  * interface has been set as a multicast option, use the
 839                  * address of that interface as our source address.
 840                  */
 841                 if (!jailed && IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 842                     inp->inp_moptions != NULL) {
 843                         struct ip_moptions *imo;
 844                         struct ifnet *ifp;
 845
 846                         imo = inp->inp_moptions;
 847                         if (imo->imo_multicast_ifp != NULL) {
 848                                 struct in_ifaddr_container *iac;
 849
 850                                 ifp = imo->imo_multicast_ifp;
 851                                 ia = NULL;
 852                                 TAILQ_FOREACH(iac,
 853                                 &in_ifaddrheads[mycpuid], ia_link) {
 854                                         if (iac->ia->ia_ifp == ifp) {
 855                                                 ia = iac->ia;
 856                                                 break;
 857                                         }
 858                                 }
 859                                 if (ia == NULL)
 860                                         goto fail;
 861                         }
 862                 }
 863                 /*
 864                  * Don't do pcblookup call here; return interface in plocal_sin
 865                  * and exit to caller, that will do the lookup.
 866                  */
 867                 if (ia == NULL && jailed) {
 868                         if ((jsin = prison_get_nonlocal(cred->cr_prison, AF_INET, NULL)) != NULL ||
 869                             (jsin = prison_get_local(cred->cr_prison, AF_INET, NULL)) != NULL) {
 870                                 *plocal_sin = satosin(jsin);
 871                         } else {
 872                                 /* IPv6 only Jail */
 873                                 goto fail;
 874                         }
 875                 } else {
 876                         *plocal_sin = &ia->ia_addr;
 877                 }
 878         }
 879         return (0);
 880 fail:
 881         if (alloc_route) {
 882                 struct route *ro = &inp->inp_route;
 883
 884                 if (ro->ro_rt != NULL)
 885                         RTFREE(ro->ro_rt);
 886                 bzero(ro, sizeof(*ro));
 887         }
 888         return (EADDRNOTAVAIL);
 889 }
 890
 891 /*
 892  * Outer subroutine:
 893  * Connect from a socket to a specified address.
 894  * Both address and port must be specified in argument sin.
 895  * If don't have a local address for this socket yet,
 896  * then pick one.
 897  */
 898 int
 899 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 900 {
 901         struct sockaddr_in *if_sin;
 902         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 903         int error;
 904
 905         /* Call inner routine to assign local interface address. */
 906         if ((error = in_pcbladdr(inp, nam, &if_sin, td)) != 0)
 907                 return (error);
 908
 909         if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port,
 910                               inp->inp_laddr.s_addr ?
 911                                 inp->inp_laddr : if_sin->sin_addr,
 912                               inp->inp_lport, FALSE, NULL) != NULL) {
 913                 return (EADDRINUSE);
 914         }
 915         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 916                 if (inp->inp_lport == 0) {
 917                         error = in_pcbbind(inp, NULL, td);
 918                         if (error)
 919                                 return (error);
 920                 }
 921                 inp->inp_laddr = if_sin->sin_addr;
 922         }
 923         inp->inp_faddr = sin->sin_addr;
 924         inp->inp_fport = sin->sin_port;
 925         in_pcbinsconnhash(inp);
 926         return (0);
 927 }
 928
 929 void
 930 in_pcbdisconnect(struct inpcb *inp)
 931 {
 932
 933         inp->inp_faddr.s_addr = INADDR_ANY;
 934         inp->inp_fport = 0;
 935         in_pcbremconnhash(inp);
 936         if (inp->inp_socket->so_state & SS_NOFDREF)
 937                 in_pcbdetach(inp);
 938 }
 939
 940 void
 941 in_pcbdetach(struct inpcb *inp)
 942 {
 943         struct socket *so = inp->inp_socket;
 944         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 945
 946 #ifdef IPSEC
 947         ipsec4_delete_pcbpolicy(inp);
 948 #endif /*IPSEC*/
 949         inp->inp_gencnt = ++ipi->ipi_gencnt;
 950         KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
 951         in_pcbremlists(inp);
 952         so->so_pcb = NULL;
 953         sofree(so);                     /* remove pcb ref */
 954         if (inp->inp_options)
 955                 m_free(inp->inp_options);
 956         if (inp->inp_route.ro_rt)
 957                 rtfree(inp->inp_route.ro_rt);
 958         ip_freemoptions(inp->inp_moptions);
 959         inp->inp_vflag = 0;
 960         kfree(inp, M_PCB);
 961 }
 962
 963 /*
 964  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
 965  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 966  * in struct pr_usrreqs, so that protocols can just reference then directly
 967  * without the need for a wrapper function.  The socket must have a valid
 968  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 969  * except through a kernel programming error, so it is acceptable to panic
 970  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 971  * because there actually /is/ a programming error somewhere... XXX)
 972  */
 973 int
 974 in_setsockaddr(struct socket *so, struct sockaddr **nam)
 975 {
 976         struct inpcb *inp;
 977         struct sockaddr_in *sin;
 978
 979         /*
 980          * Do the malloc first in case it blocks.
 981          */
 982         sin = kmalloc(sizeof *sin, M_SONAME, M_WAITOK | M_ZERO);
 983         sin->sin_family = AF_INET;
 984         sin->sin_len = sizeof *sin;
 985
 986         crit_enter();
 987         inp = so->so_pcb;
 988         if (!inp) {
 989                 crit_exit();
 990                 kfree(sin, M_SONAME);
 991                 return (ECONNRESET);
 992         }
 993         sin->sin_port = inp->inp_lport;
 994         sin->sin_addr = inp->inp_laddr;
 995         crit_exit();
 996
 997         *nam = (struct sockaddr *)sin;
 998         return (0);
 999 }
1000
1001 void
1002 in_setsockaddr_dispatch(netmsg_t msg)
1003 {
1004         int error;
1005
1006         error = in_setsockaddr(msg->base.nm_so, msg->peeraddr.nm_nam);
1007         lwkt_replymsg(&msg->lmsg, error);
1008 }
1009
1010 int
1011 in_setpeeraddr(struct socket *so, struct sockaddr **nam)
1012 {
1013         struct inpcb *inp;
1014         struct sockaddr_in *sin;
1015
1016         /*
1017          * Do the malloc first in case it blocks.
1018          */
1019         sin = kmalloc(sizeof *sin, M_SONAME, M_WAITOK | M_ZERO);
1020         sin->sin_family = AF_INET;
1021         sin->sin_len = sizeof *sin;
1022
1023         crit_enter();
1024         inp = so->so_pcb;
1025         if (!inp) {
1026                 crit_exit();
1027                 kfree(sin, M_SONAME);
1028                 return (ECONNRESET);
1029         }
1030         sin->sin_port = inp->inp_fport;
1031         sin->sin_addr = inp->inp_faddr;
1032         crit_exit();
1033
1034         *nam = (struct sockaddr *)sin;
1035         return (0);
1036 }
1037
1038 void
1039 in_setpeeraddr_dispatch(netmsg_t msg)
1040 {
1041         int error;
1042
1043         error = in_setpeeraddr(msg->base.nm_so, msg->peeraddr.nm_nam);
1044         lwkt_replymsg(&msg->lmsg, error);
1045 }
1046
1047 void
1048 in_pcbnotifyall(struct inpcbhead *head, struct in_addr faddr, int err,
1049                 void (*notify)(struct inpcb *, int))
1050 {
1051         struct inpcb *inp, *ninp;
1052
1053         /*
1054          * note: if INP_PLACEMARKER is set we must ignore the rest of
1055          * the structure and skip it.
1056          */
1057         crit_enter();
1058         LIST_FOREACH_MUTABLE(inp, head, inp_list, ninp) {
1059                 if (inp->inp_flags & INP_PLACEMARKER)
1060                         continue;
1061 #ifdef INET6
1062                 if (!(inp->inp_vflag & INP_IPV4))
1063                         continue;
1064 #endif
1065                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1066                     inp->inp_socket == NULL)
1067                         continue;
1068                 (*notify)(inp, err);            /* can remove inp from list! */
1069         }
1070         crit_exit();
1071 }
1072
1073 void
1074 in_pcbpurgeif0(struct inpcb *head, struct ifnet *ifp)
1075 {
1076         struct inpcb *inp;
1077         struct ip_moptions *imo;
1078         int i, gap;
1079
1080         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
1081                 if (inp->inp_flags & INP_PLACEMARKER)
1082                         continue;
1083                 imo = inp->inp_moptions;
1084                 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) {
1085                         /*
1086                          * Unselect the outgoing interface if it is being
1087                          * detached.
1088                          */
1089                         if (imo->imo_multicast_ifp == ifp)
1090                                 imo->imo_multicast_ifp = NULL;
1091
1092                         /*
1093                          * Drop multicast group membership if we joined
1094                          * through the interface being detached.
1095                          */
1096                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1097                             i++) {
1098                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1099                                         in_delmulti(imo->imo_membership[i]);
1100                                         gap++;
1101                                 } else if (gap != 0)
1102                                         imo->imo_membership[i - gap] =
1103                                             imo->imo_membership[i];
1104                         }
1105                         imo->imo_num_memberships -= gap;
1106                 }
1107         }
1108 }
1109
1110 /*
1111  * Check for alternatives when higher level complains
1112  * about service problems.  For now, invalidate cached
1113  * routing information.  If the route was created dynamically
1114  * (by a redirect), time to try a default gateway again.
1115  */
1116 void
1117 in_losing(struct inpcb *inp)
1118 {
1119         struct rtentry *rt;
1120         struct rt_addrinfo rtinfo;
1121
1122         if ((rt = inp->inp_route.ro_rt)) {
1123                 bzero(&rtinfo, sizeof(struct rt_addrinfo));
1124                 rtinfo.rti_info[RTAX_DST] = rt_key(rt);
1125                 rtinfo.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1126                 rtinfo.rti_info[RTAX_NETMASK] = rt_mask(rt);
1127                 rtinfo.rti_flags = rt->rt_flags;
1128                 rt_missmsg(RTM_LOSING, &rtinfo, rt->rt_flags, 0);
1129                 if (rt->rt_flags & RTF_DYNAMIC)
1130                         rtrequest1_global(RTM_DELETE, &rtinfo, NULL, NULL);
1131                 inp->inp_route.ro_rt = NULL;
1132                 rtfree(rt);
1133                 /*
1134                  * A new route can be allocated
1135                  * the next time output is attempted.
1136                  */
1137         }
1138 }
1139
1140 /*
1141  * After a routing change, flush old routing
1142  * and allocate a (hopefully) better one.
1143  */
1144 void
1145 in_rtchange(struct inpcb *inp, int err)
1146 {
1147         if (inp->inp_route.ro_rt) {
1148                 rtfree(inp->inp_route.ro_rt);
1149                 inp->inp_route.ro_rt = NULL;
1150                 /*
1151                  * A new route can be allocated the next time
1152                  * output is attempted.
1153                  */
1154         }
1155 }
1156
1157 /*
1158  * Lookup a PCB based on the local address and port.
1159  */
1160 struct inpcb *
1161 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
1162                    u_int lport_arg, int wild_okay, struct ucred *cred)
1163 {
1164         struct inpcb *inp;
1165         int matchwild = 3, wildcard;
1166         u_short lport = lport_arg;
1167         struct inpcbporthead *porthash;
1168         struct inpcbport *phd;
1169         struct inpcb *match = NULL;
1170
1171         /*
1172          * If the porthashbase is shared across several cpus we need
1173          * to lock.
1174          */
1175         if (pcbinfo->porttoken)
1176                 lwkt_gettoken(pcbinfo->porttoken);
1177
1178         /*
1179          * Best fit PCB lookup.
1180          *
1181          * First see if this local port is in use by looking on the
1182          * port hash list.
1183          */
1184         porthash = &pcbinfo->porthashbase[
1185                         INP_PCBPORTHASH(lport, pcbinfo->porthashmask)];
1186         LIST_FOREACH(phd, porthash, phd_hash) {
1187                 if (phd->phd_port == lport)
1188                         break;
1189         }
1190         if (phd != NULL) {
1191                 /*
1192                  * Port is in use by one or more PCBs. Look for best
1193                  * fit.
1194                  */
1195                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1196                         wildcard = 0;
1197 #ifdef INET6
1198                         if ((inp->inp_vflag & INP_IPV4) == 0)
1199                                 continue;
1200 #endif
1201                         if (inp->inp_faddr.s_addr != INADDR_ANY)
1202                                 wildcard++;
1203                         if (inp->inp_laddr.s_addr != INADDR_ANY) {
1204                                 if (laddr.s_addr == INADDR_ANY)
1205                                         wildcard++;
1206                                 else if (inp->inp_laddr.s_addr != laddr.s_addr)
1207                                         continue;
1208                         } else {
1209                                 if (laddr.s_addr != INADDR_ANY)
1210                                         wildcard++;
1211                         }
1212                         if (wildcard && !wild_okay)
1213                                 continue;
1214                         if (wildcard < matchwild &&
1215                             (cred == NULL ||
1216                              cred->cr_prison ==
1217                                         inp->inp_socket->so_cred->cr_prison)) {
1218                                 match = inp;
1219                                 matchwild = wildcard;
1220                                 if (matchwild == 0) {
1221                                         break;
1222                                 }
1223                         }
1224                 }
1225         }
1226         if (pcbinfo->porttoken)
1227                 lwkt_reltoken(pcbinfo->porttoken);
1228         return (match);
1229 }
1230
1231 /*
1232  * Lookup PCB in hash list.
1233  */
1234 struct inpcb *
1235 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1236                   u_int fport_arg, struct in_addr laddr, u_int lport_arg,
1237                   boolean_t wildcard, struct ifnet *ifp)
1238 {
1239         struct inpcbhead *head;
1240         struct inpcb *inp, *jinp=NULL;
1241         u_short fport = fport_arg, lport = lport_arg;
1242
1243         /*
1244          * First look for an exact match.
1245          */
1246         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport,
1247             laddr.s_addr, lport, pcbinfo->hashmask)];
1248         LIST_FOREACH(inp, head, inp_hash) {
1249 #ifdef INET6
1250                 if (!(inp->inp_vflag & INP_IPV4))
1251                         continue;
1252 #endif
1253                 if (in_hosteq(inp->inp_faddr, faddr) &&
1254                     in_hosteq(inp->inp_laddr, laddr) &&
1255                     inp->inp_fport == fport && inp->inp_lport == lport) {
1256                         /* found */
1257                         if (inp->inp_socket == NULL ||
1258                             inp->inp_socket->so_cred->cr_prison == NULL) {
1259                                 return (inp);
1260                         } else {
1261                                 if  (jinp == NULL)
1262                                         jinp = inp;
1263                         }
1264                 }
1265         }
1266         if (jinp != NULL)
1267                 return (jinp);
1268         if (wildcard) {
1269                 struct inpcb *local_wild = NULL;
1270                 struct inpcb *jinp_wild = NULL;
1271 #ifdef INET6
1272                 struct inpcb *local_wild_mapped = NULL;
1273 #endif
1274                 struct inpcontainer *ic;
1275                 struct inpcontainerhead *chead;
1276                 struct sockaddr_in jsin;
1277                 struct ucred *cred;
1278
1279                 /*
1280                  * Order of socket selection:
1281                  * 1. non-jailed, non-wild.
1282                  * 2. non-jailed, wild.
1283                  * 3. jailed, non-wild.
1284                  * 4. jailed, wild.
1285                  */
1286                 jsin.sin_family = AF_INET;
1287                 chead = &pcbinfo->wildcardhashbase[
1288                     INP_PCBWILDCARDHASH(lport, pcbinfo->wildcardhashmask)];
1289                 LIST_FOREACH(ic, chead, ic_list) {
1290                         inp = ic->ic_inp;
1291                         jsin.sin_addr.s_addr = laddr.s_addr;
1292 #ifdef INET6
1293                         if (!(inp->inp_vflag & INP_IPV4))
1294                                 continue;
1295 #endif
1296                         if (inp->inp_socket != NULL)
1297                                 cred = inp->inp_socket->so_cred;
1298                         else
1299                                 cred = NULL;
1300                         if (cred != NULL && jailed(cred)) {
1301                                 if (jinp != NULL)
1302                                         continue;
1303                                 else
1304                                         if (!jailed_ip(cred->cr_prison,
1305                                             (struct sockaddr *)&jsin))
1306                                                 continue;
1307                         }
1308                         if (inp->inp_lport == lport) {
1309                                 if (ifp && ifp->if_type == IFT_FAITH &&
1310                                     !(inp->inp_flags & INP_FAITH))
1311                                         continue;
1312                                 if (inp->inp_laddr.s_addr == laddr.s_addr) {
1313                                         if (cred != NULL && jailed(cred))
1314                                                 jinp = inp;
1315                                         else
1316                                                 return (inp);
1317                                 }
1318                                 if (inp->inp_laddr.s_addr == INADDR_ANY) {
1319 #ifdef INET6
1320                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
1321                                                              AF_INET6))
1322                                                 local_wild_mapped = inp;
1323                                         else
1324 #endif
1325                                                 if (cred != NULL &&
1326                                                     jailed(cred))
1327                                                         jinp_wild = inp;
1328                                                 else
1329                                                         local_wild = inp;
1330                                 }
1331                         }
1332                 }
1333                 if (local_wild != NULL)
1334                         return (local_wild);
1335 #ifdef INET6
1336                 if (local_wild_mapped != NULL)
1337                         return (local_wild_mapped);
1338 #endif
1339                 if (jinp != NULL)
1340                         return (jinp);
1341                 return (jinp_wild);
1342         }
1343
1344         /*
1345          * Not found.
1346          */
1347         return (NULL);
1348 }
1349
1350 /*
1351  * Insert PCB into connection hash table.
1352  */
1353 void
1354 in_pcbinsconnhash(struct inpcb *inp)
1355 {
1356         struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo;
1357         struct inpcbhead *bucket;
1358         u_int32_t hashkey_faddr, hashkey_laddr;
1359
1360 #ifdef INET6
1361         if (inp->inp_vflag & INP_IPV6) {
1362                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */;
1363                 hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */;
1364         } else {
1365 #endif
1366                 hashkey_faddr = inp->inp_faddr.s_addr;
1367                 hashkey_laddr = inp->inp_laddr.s_addr;
1368 #ifdef INET6
1369         }
1370 #endif
1371
1372         KASSERT(!(inp->inp_flags & INP_WILDCARD),
1373                 ("already on wildcardhash"));
1374         KASSERT(!(inp->inp_flags & INP_CONNECTED),
1375                 ("already on connhash"));
1376         inp->inp_flags |= INP_CONNECTED;
1377
1378         /*
1379          * Insert into the connection hash table.
1380          */
1381         bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr,
1382             inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)];
1383         LIST_INSERT_HEAD(bucket, inp, inp_hash);
1384 }
1385
1386 /*
1387  * Remove PCB from connection hash table.
1388  */
1389 void
1390 in_pcbremconnhash(struct inpcb *inp)
1391 {
1392         KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected"));
1393         LIST_REMOVE(inp, inp_hash);
1394         inp->inp_flags &= ~INP_CONNECTED;
1395 }
1396
1397 /*
1398  * Insert PCB into port hash table.
1399  */
1400 int
1401 in_pcbinsporthash(struct inpcb *inp)
1402 {
1403         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1404         struct inpcbporthead *pcbporthash;
1405         struct inpcbport *phd;
1406
1407         /*
1408          * If the porthashbase is shared across several cpus we need
1409          * to lock.
1410          */
1411         if (pcbinfo->porttoken)
1412                 lwkt_gettoken(pcbinfo->porttoken);
1413
1414         /*
1415          * Insert into the port hash table.
1416          */
1417         pcbporthash = &pcbinfo->porthashbase[
1418             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->porthashmask)];
1419
1420         /* Go through port list and look for a head for this lport. */
1421         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1422                 if (phd->phd_port == inp->inp_lport)
1423                         break;
1424         }
1425
1426         /* If none exists, malloc one and tack it on. */
1427         if (phd == NULL) {
1428                 KKASSERT(pcbinfo->portsave != NULL);
1429                 phd = pcbinfo->portsave;
1430                 pcbinfo->portsave = NULL;
1431                 phd->phd_port = inp->inp_lport;
1432                 LIST_INIT(&phd->phd_pcblist);
1433                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1434         }
1435
1436         inp->inp_phd = phd;
1437         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1438
1439         if (pcbinfo->porttoken)
1440                 lwkt_reltoken(pcbinfo->porttoken);
1441         if (pcbinfo->portsave == NULL) {
1442                 pcbinfo->portsave = kmalloc(sizeof(*pcbinfo->portsave),
1443                                             M_PCB, M_INTWAIT | M_ZERO);
1444         }
1445         return (0);
1446 }
1447
1448 void
1449 in_pcbinswildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1450 {
1451         struct inpcontainer *ic;
1452         struct inpcontainerhead *bucket;
1453
1454         bucket = &pcbinfo->wildcardhashbase[
1455             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1456
1457         ic = kmalloc(sizeof(struct inpcontainer), M_TEMP, M_INTWAIT);
1458         ic->ic_inp = inp;
1459         LIST_INSERT_HEAD(bucket, ic, ic_list);
1460 }
1461
1462 /*
1463  * Insert PCB into wildcard hash table.
1464  */
1465 void
1466 in_pcbinswildcardhash(struct inpcb *inp)
1467 {
1468         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1469
1470         KASSERT(!(inp->inp_flags & INP_CONNECTED),
1471                 ("already on connhash"));
1472         KASSERT(!(inp->inp_flags & INP_WILDCARD),
1473                 ("already on wildcardhash"));
1474         inp->inp_flags |= INP_WILDCARD;
1475
1476         in_pcbinswildcardhash_oncpu(inp, pcbinfo);
1477 }
1478
1479 void
1480 in_pcbremwildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1481 {
1482         struct inpcontainer *ic;
1483         struct inpcontainerhead *head;
1484
1485         /* find bucket */
1486         head = &pcbinfo->wildcardhashbase[
1487             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1488
1489         LIST_FOREACH(ic, head, ic_list) {
1490                 if (ic->ic_inp == inp)
1491                         goto found;
1492         }
1493         return;                 /* not found! */
1494
1495 found:
1496         LIST_REMOVE(ic, ic_list);       /* remove container from bucket chain */
1497         kfree(ic, M_TEMP);              /* deallocate container */
1498 }
1499
1500 /*
1501  * Remove PCB from wildcard hash table.
1502  */
1503 void
1504 in_pcbremwildcardhash(struct inpcb *inp)
1505 {
1506         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1507
1508         KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard"));
1509         in_pcbremwildcardhash_oncpu(inp, pcbinfo);
1510         inp->inp_flags &= ~INP_WILDCARD;
1511 }
1512
1513 /*
1514  * Remove PCB from various lists.
1515  */
1516 void
1517 in_pcbremlists(struct inpcb *inp)
1518 {
1519         struct inpcbinfo *pcbinfo;
1520
1521         if (inp->inp_lport) {
1522                 struct inpcbport *phd;
1523
1524                 pcbinfo = inp->inp_pcbinfo;
1525                 if (pcbinfo->porttoken)
1526                         lwkt_gettoken(pcbinfo->porttoken);
1527
1528                 phd = inp->inp_phd;
1529                 LIST_REMOVE(inp, inp_portlist);
1530                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1531                         LIST_REMOVE(phd, phd_hash);
1532                         kfree(phd, M_PCB);
1533                 }
1534                 if (pcbinfo->porttoken)
1535                         lwkt_reltoken(pcbinfo->porttoken);
1536         }
1537         if (inp->inp_flags & INP_WILDCARD) {
1538                 in_pcbremwildcardhash(inp);
1539         } else if (inp->inp_flags & INP_CONNECTED) {
1540                 in_pcbremconnhash(inp);
1541         }
1542         LIST_REMOVE(inp, inp_list);
1543         inp->inp_pcbinfo->ipi_count--;
1544 }
1545
1546 int
1547 prison_xinpcb(struct thread *td, struct inpcb *inp)
1548 {
1549         struct ucred *cr;
1550
1551         if (td->td_proc == NULL)
1552                 return (0);
1553         cr = td->td_proc->p_ucred;
1554         if (cr->cr_prison == NULL)
1555                 return (0);
1556         if (inp->inp_socket && inp->inp_socket->so_cred &&
1557             inp->inp_socket->so_cred->cr_prison &&
1558             cr->cr_prison == inp->inp_socket->so_cred->cr_prison)
1559                 return (0);
1560         return (1);
1561 }
1562
1563 int
1564 in_pcblist_global(SYSCTL_HANDLER_ARGS)
1565 {
1566         struct inpcbinfo *pcbinfo = arg1;
1567         struct inpcb *inp, *marker;
1568         struct xinpcb xi;
1569         int error, i, n;
1570
1571         /*
1572          * The process of preparing the TCB list is too time-consuming and
1573          * resource-intensive to repeat twice on every request.
1574          */
1575         if (req->oldptr == NULL) {
1576                 n = pcbinfo->ipi_count;
1577                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1578                 return 0;
1579         }
1580
1581         if (req->newptr != NULL)
1582                 return EPERM;
1583
1584         /*
1585          * OK, now we're committed to doing something.  Re-fetch ipi_count
1586          * after obtaining the generation count.
1587          */
1588         n = pcbinfo->ipi_count;
1589
1590         marker = kmalloc(sizeof(struct inpcb), M_TEMP, M_WAITOK|M_ZERO);
1591         marker->inp_flags |= INP_PLACEMARKER;
1592         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
1593
1594         i = 0;
1595         error = 0;
1596
1597         while ((inp = LIST_NEXT(marker, inp_list)) != NULL && i < n) {
1598                 LIST_REMOVE(marker, inp_list);
1599                 LIST_INSERT_AFTER(inp, marker, inp_list);
1600
1601                 if (inp->inp_flags & INP_PLACEMARKER)
1602                         continue;
1603                 if (prison_xinpcb(req->td, inp))
1604                         continue;
1605                 bzero(&xi, sizeof xi);
1606                 xi.xi_len = sizeof xi;
1607                 bcopy(inp, &xi.xi_inp, sizeof *inp);
1608                 if (inp->inp_socket)
1609                         sotoxsocket(inp->inp_socket, &xi.xi_socket);
1610                 if ((error = SYSCTL_OUT(req, &xi, sizeof xi)) != 0)
1611                         break;
1612                 ++i;
1613         }
1614         LIST_REMOVE(marker, inp_list);
1615         if (error == 0 && i < n) {
1616                 bzero(&xi, sizeof xi);
1617                 xi.xi_len = sizeof xi;
1618                 while (i < n) {
1619                         error = SYSCTL_OUT(req, &xi, sizeof xi);
1620                         ++i;
1621                 }
1622         }
1623         kfree(marker, M_TEMP);
1624         return(error);
1625 }
1626
1627 int
1628 in_pcblist_global_nomarker(SYSCTL_HANDLER_ARGS, struct xinpcb **xi0, int *nxi0)
1629 {
1630         struct inpcbinfo *pcbinfo = arg1;
1631         struct inpcb *inp;
1632         struct xinpcb *xi;
1633         int nxi;
1634
1635         *nxi0 = 0;
1636         *xi0 = NULL;
1637
1638         /*
1639          * The process of preparing the PCB list is too time-consuming and
1640          * resource-intensive to repeat twice on every request.
1641          */
1642         if (req->oldptr == NULL) {
1643                 int n = pcbinfo->ipi_count;
1644
1645                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1646                 return 0;
1647         }
1648
1649         if (req->newptr != NULL)
1650                 return EPERM;
1651
1652         if (pcbinfo->ipi_count == 0)
1653                 return 0;
1654
1655         nxi = 0;
1656         xi = kmalloc(pcbinfo->ipi_count * sizeof(*xi), M_TEMP,
1657                      M_WAITOK | M_ZERO | M_NULLOK);
1658         if (xi == NULL)
1659                 return ENOMEM;
1660
1661         LIST_FOREACH(inp, &pcbinfo->pcblisthead, inp_list) {
1662                 struct xinpcb *xi_ptr = &xi[nxi];
1663
1664                 if (prison_xinpcb(req->td, inp))
1665                         continue;
1666
1667                 xi_ptr->xi_len = sizeof(*xi_ptr);
1668                 bcopy(inp, &xi_ptr->xi_inp, sizeof(*inp));
1669                 if (inp->inp_socket)
1670                         sotoxsocket(inp->inp_socket, &xi_ptr->xi_socket);
1671                 ++nxi;
1672         }
1673
1674         if (nxi == 0) {
1675                 kfree(xi, M_TEMP);
1676                 return 0;
1677         }
1678
1679         *nxi0 = nxi;
1680         *xi0 = xi;
1681
1682         return 0;
1683 }
1684
1685 void
1686 in_savefaddr(struct socket *so, const struct sockaddr *faddr)
1687 {
1688         struct sockaddr_in *sin;
1689
1690         KASSERT(faddr->sa_family == AF_INET,
1691             ("not AF_INET faddr %d", faddr->sa_family));
1692
1693         sin = kmalloc(sizeof(*sin), M_SONAME, M_WAITOK | M_ZERO);
1694         sin->sin_family = AF_INET;
1695         sin->sin_len = sizeof(*sin);
1696         sin->sin_port = ((const struct sockaddr_in *)faddr)->sin_port;
1697         sin->sin_addr = ((const struct sockaddr_in *)faddr)->sin_addr;
1698
1699         so->so_faddr = (struct sockaddr *)sin;
1700 }