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. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
  63  * $FreeBSD: src/sys/netinet/in_pcb.c,v 1.59.2.27 2004/01/02 04:06:42 ambrisko Exp $
  64  */
  65
  66 #include "opt_ipsec.h"
  67 #include "opt_inet6.h"
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/malloc.h>
  72 #include <sys/mbuf.h>
  73 #include <sys/domain.h>
  74 #include <sys/protosw.h>
  75 #include <sys/socket.h>
  76 #include <sys/socketvar.h>
  77 #include <sys/proc.h>
  78 #include <sys/priv.h>
  79 #include <sys/jail.h>
  80 #include <sys/kernel.h>
  81 #include <sys/sysctl.h>
  82
  83 #include <sys/thread2.h>
  84 #include <sys/socketvar2.h>
  85 #include <sys/msgport2.h>
  86
  87 #include <machine/limits.h>
  88
  89 #include <net/if.h>
  90 #include <net/if_types.h>
  91 #include <net/route.h>
  92
  93 #include <netinet/in.h>
  94 #include <netinet/in_pcb.h>
  95 #include <netinet/in_var.h>
  96 #include <netinet/ip_var.h>
  97 #ifdef INET6
  98 #include <netinet/ip6.h>
  99 #include <netinet6/ip6_var.h>
 100 #endif /* INET6 */
 101
 102 #ifdef IPSEC
 103 #include <netinet6/ipsec.h>
 104 #include <netproto/key/key.h>
 105 #include <netproto/ipsec/esp_var.h>
 106 #endif
 107
 108 #ifdef FAST_IPSEC
 109 #if defined(IPSEC) || defined(IPSEC_ESP)
 110 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
 111 #endif
 112
 113 #include <netproto/ipsec/ipsec.h>
 114 #include <netproto/ipsec/key.h>
 115 #define IPSEC
 116 #endif /* FAST_IPSEC */
 117
 118 #define INP_LOCALGROUP_SIZMIN   8
 119 #define INP_LOCALGROUP_SIZMAX   256
 120
 121 struct in_addr zeroin_addr;
 122
 123 /*
 124  * These configure the range of local port addresses assigned to
 125  * "unspecified" outgoing connections/packets/whatever.
 126  */
 127 int ipport_lowfirstauto = IPPORT_RESERVED - 1;  /* 1023 */
 128 int ipport_lowlastauto = IPPORT_RESERVEDSTART;  /* 600 */
 129
 130 int ipport_firstauto = IPPORT_RESERVED;         /* 1024 */
 131 int ipport_lastauto = IPPORT_USERRESERVED;      /* 5000 */
 132
 133 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO;    /* 49152 */
 134 int ipport_hilastauto = IPPORT_HILASTAUTO;      /* 65535 */
 135
 136 #define RANGECHK(var, min, max) \
 137         if ((var) < (min)) { (var) = (min); } \
 138         else if ((var) > (max)) { (var) = (max); }
 139
 140 int udpencap_enable = 1;        /* enabled by default */
 141 int udpencap_port = 4500;       /* triggers decapsulation */
 142
 143 static int
 144 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 145 {
 146         int error;
 147
 148         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 149         if (!error) {
 150                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 151                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 152
 153                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
 154                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
 155
 156                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
 157                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
 158         }
 159         return (error);
 160 }
 161
 162 #undef RANGECHK
 163
 164 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 165
 166 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
 167            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
 168 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
 169            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
 170 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
 171            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
 172 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
 173            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
 174 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
 175            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
 176 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
 177            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
 178
 179 /*
 180  * in_pcb.c: manage the Protocol Control Blocks.
 181  *
 182  * NOTE: It is assumed that most of these functions will be called from
 183  * a critical section.  XXX - There are, unfortunately, a few exceptions
 184  * to this rule that should be fixed.
 185  *
 186  * NOTE: The caller should initialize the cpu field to the cpu running the
 187  * protocol stack associated with this inpcbinfo.
 188  */
 189
 190 void
 191 in_pcbinfo_init(struct inpcbinfo *pcbinfo)
 192 {
 193         LIST_INIT(&pcbinfo->pcblisthead);
 194         pcbinfo->cpu = -1;
 195         pcbinfo->portsave = kmalloc(sizeof(*pcbinfo->portsave), M_PCB,
 196                                     M_WAITOK | M_ZERO);
 197 }
 198
 199 struct baddynamicports baddynamicports;
 200
 201 /*
 202  * Check if the specified port is invalid for dynamic allocation.
 203  */
 204 int
 205 in_baddynamic(u_int16_t port, u_int16_t proto)
 206 {
 207         switch (proto) {
 208         case IPPROTO_TCP:
 209                 return (DP_ISSET(baddynamicports.tcp, port));
 210         case IPPROTO_UDP:
 211 #ifdef IPSEC
 212                 /* Cannot preset this as it is a sysctl */
 213                 if (port == udpencap_port)
 214                         return (1);
 215 #endif
 216                 return (DP_ISSET(baddynamicports.udp, port));
 217         default:
 218                 return (0);
 219         }
 220 }
 221
 222
 223 /*
 224  * Allocate a PCB and associate it with the socket.
 225  */
 226 int
 227 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 228 {
 229         struct inpcb *inp;
 230 #ifdef IPSEC
 231         int error;
 232 #endif
 233
 234         inp = kmalloc(pcbinfo->ipi_size, M_PCB, M_WAITOK|M_ZERO|M_NULLOK);
 235         if (inp == NULL)
 236                 return (ENOMEM);
 237         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 238         inp->inp_pcbinfo = inp->inp_cpcbinfo = pcbinfo;
 239         inp->inp_socket = so;
 240 #ifdef IPSEC
 241         error = ipsec_init_policy(so, &inp->inp_sp);
 242         if (error != 0) {
 243                 kfree(inp, M_PCB);
 244                 return (error);
 245         }
 246 #endif
 247 #ifdef INET6
 248         if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only)
 249                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
 250         if (ip6_auto_flowlabel)
 251                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 252 #endif
 253         soreference(so);
 254         so->so_pcb = inp;
 255         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
 256         pcbinfo->ipi_count++;
 257         return (0);
 258 }
 259
 260 /*
 261  * Unlink a pcb with the intention of moving it to another cpu with a
 262  * different pcbinfo.  While unlinked nothing should attempt to dereference
 263  * inp_pcbinfo, NULL it out so we assert if it does.
 264  */
 265 void
 266 in_pcbunlink(struct inpcb *inp, struct inpcbinfo *pcbinfo)
 267 {
 268         KASSERT(inp->inp_pcbinfo == pcbinfo, ("pcbinfo mismatch"));
 269         KASSERT(inp->inp_cpcbinfo == pcbinfo, ("cpcbinfo mismatch"));
 270         KASSERT((inp->inp_flags & (INP_WILDCARD | INP_CONNECTED)) == 0,
 271             ("already linked"));
 272
 273         LIST_REMOVE(inp, inp_list);
 274         pcbinfo->ipi_count--;
 275         inp->inp_pcbinfo = NULL;
 276         inp->inp_cpcbinfo = NULL;
 277 }
 278
 279 /*
 280  * Relink a pcb into a new pcbinfo.
 281  */
 282 void
 283 in_pcblink(struct inpcb *inp, struct inpcbinfo *pcbinfo)
 284 {
 285         KASSERT(inp->inp_pcbinfo == NULL, ("has pcbinfo"));
 286         KASSERT(inp->inp_cpcbinfo == NULL, ("has cpcbinfo"));
 287         KASSERT((inp->inp_flags & (INP_WILDCARD | INP_CONNECTED)) == 0,
 288             ("already linked"));
 289
 290         inp->inp_cpcbinfo = pcbinfo;
 291         inp->inp_pcbinfo = pcbinfo;
 292         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
 293         pcbinfo->ipi_count++;
 294 }
 295
 296 int
 297 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 298 {
 299         struct socket *so = inp->inp_socket;
 300         unsigned short *lastport;
 301         struct sockaddr_in *sin;
 302         struct sockaddr_in jsin;
 303         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 304         struct ucred *cred = NULL;
 305         u_short lport = 0;
 306         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 307         int error;
 308
 309         if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) /* XXX broken! */
 310                 return (EADDRNOTAVAIL);
 311         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 312                 return (EINVAL);        /* already bound */
 313
 314         if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT)))
 315                 wild = 1;    /* neither SO_REUSEADDR nor SO_REUSEPORT is set */
 316         if (td->td_proc)
 317                 cred = td->td_proc->p_ucred;
 318
 319         /*
 320          * This has to be atomic.  If the porthash is shared across multiple
 321          * protocol threads (aka tcp) then the token will be non-NULL.
 322          */
 323         if (pcbinfo->porttoken)
 324                 lwkt_gettoken(pcbinfo->porttoken);
 325
 326         if (nam != NULL) {
 327                 sin = (struct sockaddr_in *)nam;
 328                 if (nam->sa_len != sizeof *sin) {
 329                         error = EINVAL;
 330                         goto done;
 331                 }
 332 #ifdef notdef
 333                 /*
 334                  * We should check the family, but old programs
 335                  * incorrectly fail to initialize it.
 336                  */
 337                 if (sin->sin_family != AF_INET) {
 338                         error = EAFNOSUPPORT;
 339                         goto done;
 340                 }
 341 #endif
 342                 if (!prison_replace_wildcards(td, nam)) {
 343                         error = EINVAL;
 344                         goto done;
 345                 }
 346                 lport = sin->sin_port;
 347                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 348                         /*
 349                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 350                          * allow complete duplication of binding if
 351                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 352                          * and a multicast address is bound on both
 353                          * new and duplicated sockets.
 354                          */
 355                         if (so->so_options & SO_REUSEADDR)
 356                                 reuseport = SO_REUSEADDR | SO_REUSEPORT;
 357                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 358                         sin->sin_port = 0;              /* yech... */
 359                         bzero(&sin->sin_zero, sizeof sin->sin_zero);
 360                         if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL) {
 361                                 error = EADDRNOTAVAIL;
 362                                 goto done;
 363                         }
 364                 }
 365                 if (lport != 0) {
 366                         struct inpcb *t;
 367
 368                         /* GROSS */
 369                         if (ntohs(lport) < IPPORT_RESERVED &&
 370                             cred &&
 371                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0)) {
 372                                 error = EACCES;
 373                                 goto done;
 374                         }
 375                         if (so->so_cred->cr_uid != 0 &&
 376                             !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 377                                 t = in_pcblookup_local(pcbinfo,
 378                                                        sin->sin_addr,
 379                                                        lport,
 380                                                        INPLOOKUP_WILDCARD,
 381                                                        cred);
 382                                 if (t &&
 383                                     (!in_nullhost(sin->sin_addr) ||
 384                                      !in_nullhost(t->inp_laddr) ||
 385                                      (t->inp_socket->so_options &
 386                                          SO_REUSEPORT) == 0) &&
 387                                     (so->so_cred->cr_uid !=
 388                                      t->inp_socket->so_cred->cr_uid)) {
 389 #ifdef INET6
 390                                         if (!in_nullhost(sin->sin_addr) ||
 391                                             !in_nullhost(t->inp_laddr) ||
 392                                             INP_SOCKAF(so) ==
 393                                             INP_SOCKAF(t->inp_socket))
 394 #endif
 395                                         {
 396                                                 error = EADDRINUSE;
 397                                                 goto done;
 398                                         }
 399                                 }
 400                         }
 401                         if (cred && !prison_replace_wildcards(td, nam)) {
 402                                 error = EADDRNOTAVAIL;
 403                                 goto done;
 404                         }
 405                         t = in_pcblookup_local(pcbinfo, sin->sin_addr, lport,
 406                                                wild, cred);
 407                         if (t && !(reuseport & t->inp_socket->so_options)) {
 408 #ifdef INET6
 409                                 if (!in_nullhost(sin->sin_addr) ||
 410                                     !in_nullhost(t->inp_laddr) ||
 411                                     INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
 412 #endif
 413                                 {
 414                                         error = EADDRINUSE;
 415                                         goto done;
 416                                 }
 417                         }
 418                 }
 419                 inp->inp_laddr = sin->sin_addr;
 420         }
 421
 422         jsin.sin_family = AF_INET;
 423         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 424         if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
 425                 inp->inp_laddr.s_addr = INADDR_ANY;
 426                 error = EINVAL;
 427                 goto done;
 428         }
 429         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 430
 431         if (lport == 0) {
 432                 ushort first, last;
 433                 int count;
 434
 435                 inp->inp_flags |= INP_ANONPORT;
 436
 437                 if (inp->inp_flags & INP_HIGHPORT) {
 438                         first = ipport_hifirstauto;     /* sysctl */
 439                         last  = ipport_hilastauto;
 440                         lastport = &pcbinfo->lasthi;
 441                 } else if (inp->inp_flags & INP_LOWPORT) {
 442                         if (cred &&
 443                             (error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))) {
 444                                 inp->inp_laddr.s_addr = INADDR_ANY;
 445                                 goto done;
 446                         }
 447                         first = ipport_lowfirstauto;    /* 1023 */
 448                         last  = ipport_lowlastauto;     /* 600 */
 449                         lastport = &pcbinfo->lastlow;
 450                 } else {
 451                         first = ipport_firstauto;       /* sysctl */
 452                         last  = ipport_lastauto;
 453                         lastport = &pcbinfo->lastport;
 454                 }
 455                 /*
 456                  * Simple check to ensure all ports are not used up causing
 457                  * a deadlock here.
 458                  *
 459                  * We split the two cases (up and down) so that the direction
 460                  * is not being tested on each round of the loop.
 461                  */
 462                 if (first > last) {
 463                         /*
 464                          * counting down
 465                          */
 466                         count = first - last;
 467
 468                         do {
 469                                 if (count-- < 0) {      /* completely used? */
 470                                         inp->inp_laddr.s_addr = INADDR_ANY;
 471                                         error = EADDRNOTAVAIL;
 472                                         goto done;
 473                                 }
 474                                 --*lastport;
 475                                 if (*lastport > first || *lastport < last)
 476                                         *lastport = first;
 477                                 lport = htons(*lastport);
 478                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
 479                                                     lport, wild, cred));
 480                 } else {
 481                         /*
 482                          * counting up
 483                          */
 484                         count = last - first;
 485
 486                         do {
 487                                 if (count-- < 0) {      /* completely used? */
 488                                         inp->inp_laddr.s_addr = INADDR_ANY;
 489                                         error = EADDRNOTAVAIL;
 490                                         goto done;
 491                                 }
 492                                 ++*lastport;
 493                                 if (*lastport < first || *lastport > last)
 494                                         *lastport = first;
 495                                 lport = htons(*lastport);
 496                         } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
 497                                                     lport, wild, cred));
 498                 }
 499         }
 500         inp->inp_lport = lport;
 501
 502         if (in_pcbinsporthash(inp) != 0) {
 503                 inp->inp_laddr.s_addr = INADDR_ANY;
 504                 inp->inp_lport = 0;
 505                 error = EAGAIN;
 506                 goto done;
 507         }
 508         error = 0;
 509 done:
 510         if (pcbinfo->porttoken)
 511                 lwkt_reltoken(pcbinfo->porttoken);
 512         return error;
 513 }
 514
 515 static struct inpcb *
 516 in_pcblookup_addrport(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 517     u_short lport, struct in_addr faddr, u_short fport, struct ucred *cred)
 518 {
 519         struct inpcb *inp;
 520         struct inpcbporthead *porthash;
 521         struct inpcbport *phd;
 522         struct inpcb *match = NULL;
 523
 524         /*
 525          * If the porthashbase is shared across several cpus we need
 526          * to lock.
 527          */
 528         if (pcbinfo->porttoken)
 529                 lwkt_gettoken(pcbinfo->porttoken);
 530
 531         /*
 532          * Best fit PCB lookup.
 533          *
 534          * First see if this local port is in use by looking on the
 535          * port hash list.
 536          */
 537         porthash = &pcbinfo->porthashbase[
 538                         INP_PCBPORTHASH(lport, pcbinfo->porthashmask)];
 539         LIST_FOREACH(phd, porthash, phd_hash) {
 540                 if (phd->phd_port == lport)
 541                         break;
 542         }
 543         if (phd != NULL) {
 544                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 545 #ifdef INET6
 546                         if ((inp->inp_vflag & INP_IPV4) == 0)
 547                                 continue;
 548 #endif
 549                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 550                             inp->inp_laddr.s_addr != laddr.s_addr)
 551                                 continue;
 552
 553                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 554                             inp->inp_faddr.s_addr != faddr.s_addr)
 555                                 continue;
 556
 557                         if (inp->inp_fport != 0 && inp->inp_fport != fport)
 558                                 continue;
 559
 560                         if (cred == NULL ||
 561                             cred->cr_prison ==
 562                             inp->inp_socket->so_cred->cr_prison) {
 563                                 match = inp;
 564                                 break;
 565                         }
 566                 }
 567         }
 568         if (pcbinfo->porttoken)
 569                 lwkt_reltoken(pcbinfo->porttoken);
 570         return (match);
 571 }
 572
 573 int
 574 in_pcbconn_bind(struct inpcb *inp, const struct sockaddr *nam,
 575     struct thread *td)
 576 {
 577         struct proc *p = td->td_proc;
 578         unsigned short *lastport;
 579         const struct sockaddr_in *sin = (const struct sockaddr_in *)nam;
 580         struct sockaddr_in jsin;
 581         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 582         struct ucred *cred = NULL;
 583         u_short lport = 0;
 584         ushort first, last;
 585         int count, error, dup = 0;
 586
 587         if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) /* XXX broken! */
 588                 return (EADDRNOTAVAIL);
 589
 590         KKASSERT(inp->inp_laddr.s_addr != INADDR_ANY);
 591         if (inp->inp_lport != 0)
 592                 return (EINVAL);        /* already bound */
 593
 594         KKASSERT(p);
 595         cred = p->p_ucred;
 596
 597         /*
 598          * This has to be atomic.  If the porthash is shared across multiple
 599          * protocol threads (aka tcp) then the token will be non-NULL.
 600          */
 601         if (pcbinfo->porttoken)
 602                 lwkt_gettoken(pcbinfo->porttoken);
 603
 604         jsin.sin_family = AF_INET;
 605         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 606         if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
 607                 inp->inp_laddr.s_addr = INADDR_ANY;
 608                 error = EINVAL;
 609                 goto done;
 610         }
 611         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 612
 613         inp->inp_flags |= INP_ANONPORT;
 614
 615         if (inp->inp_flags & INP_HIGHPORT) {
 616                 first = ipport_hifirstauto;     /* sysctl */
 617                 last  = ipport_hilastauto;
 618                 lastport = &pcbinfo->lasthi;
 619         } else if (inp->inp_flags & INP_LOWPORT) {
 620                 if (cred &&
 621                     (error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))) {
 622                         inp->inp_laddr.s_addr = INADDR_ANY;
 623                         goto done;
 624                 }
 625                 first = ipport_lowfirstauto;    /* 1023 */
 626                 last  = ipport_lowlastauto;     /* 600 */
 627                 lastport = &pcbinfo->lastlow;
 628         } else {
 629                 first = ipport_firstauto;       /* sysctl */
 630                 last  = ipport_lastauto;
 631                 lastport = &pcbinfo->lastport;
 632         }
 633
 634 again:
 635         /*
 636          * Simple check to ensure all ports are not used up causing
 637          * a deadlock here.
 638          *
 639          * We split the two cases (up and down) so that the direction
 640          * is not being tested on each round of the loop.
 641          */
 642         if (first > last) {
 643                 /*
 644                  * counting down
 645                  */
 646                 count = first - last;
 647
 648                 do {
 649                         if (count-- < 0) {      /* completely used? */
 650                                 inp->inp_laddr.s_addr = INADDR_ANY;
 651                                 error = EADDRNOTAVAIL;
 652                                 goto done;
 653                         }
 654                         --*lastport;
 655                         if (*lastport > first || *lastport < last)
 656                                 *lastport = first;
 657                         lport = htons(*lastport);
 658                 } while (in_pcblookup_addrport(pcbinfo, inp->inp_laddr, lport,
 659                                 sin->sin_addr, sin->sin_port, cred));
 660         } else {
 661                 /*
 662                  * counting up
 663                  */
 664                 count = last - first;
 665
 666                 do {
 667                         if (count-- < 0) {      /* completely used? */
 668                                 inp->inp_laddr.s_addr = INADDR_ANY;
 669                                 error = EADDRNOTAVAIL;
 670                                 goto done;
 671                         }
 672                         ++*lastport;
 673                         if (*lastport < first || *lastport > last)
 674                                 *lastport = first;
 675                         lport = htons(*lastport);
 676                 } while (in_pcblookup_addrport(pcbinfo, inp->inp_laddr, lport,
 677                                 sin->sin_addr, sin->sin_port, cred));
 678         }
 679
 680         /* This could happen on loopback interface */
 681         if (sin->sin_port == lport &&
 682             sin->sin_addr.s_addr == inp->inp_laddr.s_addr) {
 683                 if (dup) {
 684                         /*
 685                          * Duplicate again; give up
 686                          */
 687                         inp->inp_laddr.s_addr = INADDR_ANY;
 688                         error = EADDRNOTAVAIL;
 689                         goto done;
 690                 }
 691                 dup = 1;
 692                 goto again;
 693         }
 694         inp->inp_lport = lport;
 695
 696         jsin.sin_family = AF_INET;
 697         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 698         if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin)) {
 699                 inp->inp_laddr.s_addr = INADDR_ANY;
 700                 inp->inp_lport = 0;
 701                 error = EINVAL;
 702                 goto done;
 703         }
 704         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 705
 706         if (in_pcbinsporthash(inp) != 0) {
 707                 inp->inp_laddr.s_addr = INADDR_ANY;
 708                 inp->inp_lport = 0;
 709                 error = EAGAIN;
 710                 goto done;
 711         }
 712         error = 0;
 713 done:
 714         if (pcbinfo->porttoken)
 715                 lwkt_reltoken(pcbinfo->porttoken);
 716         return error;
 717 }
 718
 719 /*
 720  *   Transform old in_pcbconnect() into an inner subroutine for new
 721  *   in_pcbconnect(): Do some validity-checking on the remote
 722  *   address (in mbuf 'nam') and then determine local host address
 723  *   (i.e., which interface) to use to access that remote host.
 724  *
 725  *   This preserves definition of in_pcbconnect(), while supporting a
 726  *   slightly different version for T/TCP.  (This is more than
 727  *   a bit of a kludge, but cleaning up the internal interfaces would
 728  *   have forced minor changes in every protocol).
 729  */
 730 int
 731 in_pcbladdr_find(struct inpcb *inp, struct sockaddr *nam,
 732     struct sockaddr_in **plocal_sin, struct thread *td, int find)
 733 {
 734         struct in_ifaddr *ia;
 735         struct ucred *cred = NULL;
 736         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 737         struct sockaddr *jsin;
 738         int jailed = 0, alloc_route = 0;
 739
 740         if (nam->sa_len != sizeof *sin)
 741                 return (EINVAL);
 742         if (sin->sin_family != AF_INET)
 743                 return (EAFNOSUPPORT);
 744         if (sin->sin_port == 0)
 745                 return (EADDRNOTAVAIL);
 746         if (td && td->td_proc && td->td_proc->p_ucred)
 747                 cred = td->td_proc->p_ucred;
 748         if (cred && cred->cr_prison)
 749                 jailed = 1;
 750         if (!TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) {
 751                 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
 752                 /*
 753                  * If the destination address is INADDR_ANY,
 754                  * use the primary local address.
 755                  * If the supplied address is INADDR_BROADCAST,
 756                  * and the primary interface supports broadcast,
 757                  * choose the broadcast address for that interface.
 758                  */
 759                 if (sin->sin_addr.s_addr == INADDR_ANY)
 760                         sin->sin_addr = IA_SIN(ia)->sin_addr;
 761                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
 762                     (ia->ia_ifp->if_flags & IFF_BROADCAST))
 763                         sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
 764         }
 765         if (find) {
 766                 struct route *ro;
 767
 768                 ia = NULL;
 769                 /*
 770                  * If route is known or can be allocated now,
 771                  * our src addr is taken from the i/f, else punt.
 772                  * Note that we should check the address family of the cached
 773                  * destination, in case of sharing the cache with IPv6.
 774                  */
 775                 ro = &inp->inp_route;
 776                 if (ro->ro_rt &&
 777                     (!(ro->ro_rt->rt_flags & RTF_UP) ||
 778                      ro->ro_dst.sa_family != AF_INET ||
 779                      satosin(&ro->ro_dst)->sin_addr.s_addr !=
 780                                       sin->sin_addr.s_addr ||
 781                      inp->inp_socket->so_options & SO_DONTROUTE)) {
 782                         RTFREE(ro->ro_rt);
 783                         ro->ro_rt = NULL;
 784                 }
 785                 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 786                     (ro->ro_rt == NULL ||
 787                     ro->ro_rt->rt_ifp == NULL)) {
 788                         /* No route yet, so try to acquire one */
 789                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 790                         ro->ro_dst.sa_family = AF_INET;
 791                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 792                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
 793                                 sin->sin_addr;
 794                         rtalloc(ro);
 795                         alloc_route = 1;
 796                 }
 797                 /*
 798                  * If we found a route, use the address
 799                  * corresponding to the outgoing interface
 800                  * unless it is the loopback (in case a route
 801                  * to our address on another net goes to loopback).
 802                  */
 803                 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) {
 804                         if (jailed) {
 805                                 if (jailed_ip(cred->cr_prison,
 806                                     ro->ro_rt->rt_ifa->ifa_addr)) {
 807                                         ia = ifatoia(ro->ro_rt->rt_ifa);
 808                                 }
 809                         } else {
 810                                 ia = ifatoia(ro->ro_rt->rt_ifa);
 811                         }
 812                 }
 813                 if (ia == NULL) {
 814                         u_short fport = sin->sin_port;
 815
 816                         sin->sin_port = 0;
 817                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
 818                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 819                             sintosa(&ia->ia_addr)))
 820                                 ia = NULL;
 821                         if (ia == NULL)
 822                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
 823                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 824                             sintosa(&ia->ia_addr)))
 825                                 ia = NULL;
 826                         sin->sin_port = fport;
 827                         if (ia == NULL &&
 828                             !TAILQ_EMPTY(&in_ifaddrheads[mycpuid]))
 829                                 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
 830                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 831                             sintosa(&ia->ia_addr)))
 832                                 ia = NULL;
 833
 834                         if (!jailed && ia == NULL)
 835                                 goto fail;
 836                 }
 837                 /*
 838                  * If the destination address is multicast and an outgoing
 839                  * interface has been set as a multicast option, use the
 840                  * address of that interface as our source address.
 841                  */
 842                 if (!jailed && IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 843                     inp->inp_moptions != NULL) {
 844                         struct ip_moptions *imo;
 845                         struct ifnet *ifp;
 846
 847                         imo = inp->inp_moptions;
 848                         if (imo->imo_multicast_ifp != NULL) {
 849                                 struct in_ifaddr_container *iac;
 850
 851                                 ifp = imo->imo_multicast_ifp;
 852                                 ia = NULL;
 853                                 TAILQ_FOREACH(iac,
 854                                 &in_ifaddrheads[mycpuid], ia_link) {
 855                                         if (iac->ia->ia_ifp == ifp) {
 856                                                 ia = iac->ia;
 857                                                 break;
 858                                         }
 859                                 }
 860                                 if (ia == NULL)
 861                                         goto fail;
 862                         }
 863                 }
 864                 /*
 865                  * Don't do pcblookup call here; return interface in plocal_sin
 866                  * and exit to caller, that will do the lookup.
 867                  */
 868                 if (ia == NULL && jailed) {
 869                         if ((jsin = prison_get_nonlocal(cred->cr_prison, AF_INET, NULL)) != NULL ||
 870                             (jsin = prison_get_local(cred->cr_prison, AF_INET, NULL)) != NULL) {
 871                                 *plocal_sin = satosin(jsin);
 872                         } else {
 873                                 /* IPv6 only Jail */
 874                                 goto fail;
 875                         }
 876                 } else {
 877                         *plocal_sin = &ia->ia_addr;
 878                 }
 879         }
 880         return (0);
 881 fail:
 882         if (alloc_route) {
 883                 struct route *ro = &inp->inp_route;
 884
 885                 if (ro->ro_rt != NULL)
 886                         RTFREE(ro->ro_rt);
 887                 bzero(ro, sizeof(*ro));
 888         }
 889         return (EADDRNOTAVAIL);
 890 }
 891
 892 int
 893 in_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 894     struct sockaddr_in **plocal_sin, struct thread *td)
 895 {
 896         return in_pcbladdr_find(inp, nam, plocal_sin, td,
 897             (inp->inp_laddr.s_addr == INADDR_ANY));
 898 }
 899
 900 /*
 901  * Outer subroutine:
 902  * Connect from a socket to a specified address.
 903  * Both address and port must be specified in argument sin.
 904  * If don't have a local address for this socket yet,
 905  * then pick one.
 906  */
 907 int
 908 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 909 {
 910         struct sockaddr_in *if_sin;
 911         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 912         int error;
 913
 914         /* Call inner routine to assign local interface address. */
 915         if ((error = in_pcbladdr(inp, nam, &if_sin, td)) != 0)
 916                 return (error);
 917
 918         if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port,
 919                               inp->inp_laddr.s_addr ?
 920                                 inp->inp_laddr : if_sin->sin_addr,
 921                               inp->inp_lport, FALSE, NULL) != NULL) {
 922                 return (EADDRINUSE);
 923         }
 924         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 925                 if (inp->inp_lport == 0) {
 926                         error = in_pcbbind(inp, NULL, td);
 927                         if (error)
 928                                 return (error);
 929                 }
 930                 inp->inp_laddr = if_sin->sin_addr;
 931         }
 932         inp->inp_faddr = sin->sin_addr;
 933         inp->inp_fport = sin->sin_port;
 934         in_pcbinsconnhash(inp);
 935         return (0);
 936 }
 937
 938 void
 939 in_pcbdisconnect(struct inpcb *inp)
 940 {
 941
 942         inp->inp_faddr.s_addr = INADDR_ANY;
 943         inp->inp_fport = 0;
 944         in_pcbremconnhash(inp);
 945         if (inp->inp_socket->so_state & SS_NOFDREF)
 946                 in_pcbdetach(inp);
 947 }
 948
 949 void
 950 in_pcbdetach(struct inpcb *inp)
 951 {
 952         struct socket *so = inp->inp_socket;
 953         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 954
 955 #ifdef IPSEC
 956         ipsec4_delete_pcbpolicy(inp);
 957 #endif /*IPSEC*/
 958         inp->inp_gencnt = ++ipi->ipi_gencnt;
 959         KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
 960         in_pcbremlists(inp);
 961         so->so_pcb = NULL;
 962         sofree(so);                     /* remove pcb ref */
 963         if (inp->inp_options)
 964                 m_free(inp->inp_options);
 965         if (inp->inp_route.ro_rt)
 966                 rtfree(inp->inp_route.ro_rt);
 967         ip_freemoptions(inp->inp_moptions);
 968         inp->inp_vflag = 0;
 969         kfree(inp, M_PCB);
 970 }
 971
 972 /*
 973  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
 974  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 975  * in struct pr_usrreqs, so that protocols can just reference then directly
 976  * without the need for a wrapper function.  The socket must have a valid
 977  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 978  * except through a kernel programming error, so it is acceptable to panic
 979  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 980  * because there actually /is/ a programming error somewhere... XXX)
 981  */
 982 int
 983 in_setsockaddr(struct socket *so, struct sockaddr **nam)
 984 {
 985         struct inpcb *inp;
 986         struct sockaddr_in *sin;
 987
 988         /*
 989          * Do the malloc first in case it blocks.
 990          */
 991         sin = kmalloc(sizeof *sin, M_SONAME, M_WAITOK | M_ZERO);
 992         sin->sin_family = AF_INET;
 993         sin->sin_len = sizeof *sin;
 994
 995         crit_enter();
 996         inp = so->so_pcb;
 997         if (!inp) {
 998                 crit_exit();
 999                 kfree(sin, M_SONAME);
1000                 return (ECONNRESET);
1001         }
1002         sin->sin_port = inp->inp_lport;
1003         sin->sin_addr = inp->inp_laddr;
1004         crit_exit();
1005
1006         *nam = (struct sockaddr *)sin;
1007         return (0);
1008 }
1009
1010 void
1011 in_setsockaddr_dispatch(netmsg_t msg)
1012 {
1013         int error;
1014
1015         error = in_setsockaddr(msg->base.nm_so, msg->peeraddr.nm_nam);
1016         lwkt_replymsg(&msg->lmsg, error);
1017 }
1018
1019 int
1020 in_setpeeraddr(struct socket *so, struct sockaddr **nam)
1021 {
1022         struct inpcb *inp;
1023         struct sockaddr_in *sin;
1024
1025         /*
1026          * Do the malloc first in case it blocks.
1027          */
1028         sin = kmalloc(sizeof *sin, M_SONAME, M_WAITOK | M_ZERO);
1029         sin->sin_family = AF_INET;
1030         sin->sin_len = sizeof *sin;
1031
1032         crit_enter();
1033         inp = so->so_pcb;
1034         if (!inp) {
1035                 crit_exit();
1036                 kfree(sin, M_SONAME);
1037                 return (ECONNRESET);
1038         }
1039         sin->sin_port = inp->inp_fport;
1040         sin->sin_addr = inp->inp_faddr;
1041         crit_exit();
1042
1043         *nam = (struct sockaddr *)sin;
1044         return (0);
1045 }
1046
1047 void
1048 in_setpeeraddr_dispatch(netmsg_t msg)
1049 {
1050         int error;
1051
1052         error = in_setpeeraddr(msg->base.nm_so, msg->peeraddr.nm_nam);
1053         lwkt_replymsg(&msg->lmsg, error);
1054 }
1055
1056 void
1057 in_pcbnotifyall(struct inpcbhead *head, struct in_addr faddr, int err,
1058                 void (*notify)(struct inpcb *, int))
1059 {
1060         struct inpcb *inp, *ninp;
1061
1062         /*
1063          * note: if INP_PLACEMARKER is set we must ignore the rest of
1064          * the structure and skip it.
1065          */
1066         crit_enter();
1067         LIST_FOREACH_MUTABLE(inp, head, inp_list, ninp) {
1068                 if (inp->inp_flags & INP_PLACEMARKER)
1069                         continue;
1070 #ifdef INET6
1071                 if (!(inp->inp_vflag & INP_IPV4))
1072                         continue;
1073 #endif
1074                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1075                     inp->inp_socket == NULL)
1076                         continue;
1077                 (*notify)(inp, err);            /* can remove inp from list! */
1078         }
1079         crit_exit();
1080 }
1081
1082 void
1083 in_pcbpurgeif0(struct inpcb *head, struct ifnet *ifp)
1084 {
1085         struct inpcb *inp;
1086         struct ip_moptions *imo;
1087         int i, gap;
1088
1089         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
1090                 if (inp->inp_flags & INP_PLACEMARKER)
1091                         continue;
1092                 imo = inp->inp_moptions;
1093                 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) {
1094                         /*
1095                          * Unselect the outgoing interface if it is being
1096                          * detached.
1097                          */
1098                         if (imo->imo_multicast_ifp == ifp)
1099                                 imo->imo_multicast_ifp = NULL;
1100
1101                         /*
1102                          * Drop multicast group membership if we joined
1103                          * through the interface being detached.
1104                          */
1105                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1106                             i++) {
1107                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1108                                         in_delmulti(imo->imo_membership[i]);
1109                                         gap++;
1110                                 } else if (gap != 0)
1111                                         imo->imo_membership[i - gap] =
1112                                             imo->imo_membership[i];
1113                         }
1114                         imo->imo_num_memberships -= gap;
1115                 }
1116         }
1117 }
1118
1119 /*
1120  * Check for alternatives when higher level complains
1121  * about service problems.  For now, invalidate cached
1122  * routing information.  If the route was created dynamically
1123  * (by a redirect), time to try a default gateway again.
1124  */
1125 void
1126 in_losing(struct inpcb *inp)
1127 {
1128         struct rtentry *rt;
1129         struct rt_addrinfo rtinfo;
1130
1131         if ((rt = inp->inp_route.ro_rt)) {
1132                 bzero(&rtinfo, sizeof(struct rt_addrinfo));
1133                 rtinfo.rti_info[RTAX_DST] = rt_key(rt);
1134                 rtinfo.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1135                 rtinfo.rti_info[RTAX_NETMASK] = rt_mask(rt);
1136                 rtinfo.rti_flags = rt->rt_flags;
1137                 rt_missmsg(RTM_LOSING, &rtinfo, rt->rt_flags, 0);
1138                 if (rt->rt_flags & RTF_DYNAMIC) {
1139                         rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1140                             rt_mask(rt), rt->rt_flags, NULL);
1141                 }
1142                 inp->inp_route.ro_rt = NULL;
1143                 rtfree(rt);
1144                 /*
1145                  * A new route can be allocated
1146                  * the next time output is attempted.
1147                  */
1148         }
1149 }
1150
1151 /*
1152  * After a routing change, flush old routing
1153  * and allocate a (hopefully) better one.
1154  */
1155 void
1156 in_rtchange(struct inpcb *inp, int err)
1157 {
1158         if (inp->inp_route.ro_rt) {
1159                 rtfree(inp->inp_route.ro_rt);
1160                 inp->inp_route.ro_rt = NULL;
1161                 /*
1162                  * A new route can be allocated the next time
1163                  * output is attempted.
1164                  */
1165         }
1166 }
1167
1168 /*
1169  * Lookup a PCB based on the local address and port.
1170  */
1171 struct inpcb *
1172 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
1173                    u_int lport_arg, int wild_okay, struct ucred *cred)
1174 {
1175         struct inpcb *inp;
1176         int matchwild = 3, wildcard;
1177         u_short lport = lport_arg;
1178         struct inpcbporthead *porthash;
1179         struct inpcbport *phd;
1180         struct inpcb *match = NULL;
1181
1182         /*
1183          * If the porthashbase is shared across several cpus we need
1184          * to lock.
1185          */
1186         if (pcbinfo->porttoken)
1187                 lwkt_gettoken(pcbinfo->porttoken);
1188
1189         /*
1190          * Best fit PCB lookup.
1191          *
1192          * First see if this local port is in use by looking on the
1193          * port hash list.
1194          */
1195         porthash = &pcbinfo->porthashbase[
1196                         INP_PCBPORTHASH(lport, pcbinfo->porthashmask)];
1197         LIST_FOREACH(phd, porthash, phd_hash) {
1198                 if (phd->phd_port == lport)
1199                         break;
1200         }
1201         if (phd != NULL) {
1202                 /*
1203                  * Port is in use by one or more PCBs. Look for best
1204                  * fit.
1205                  */
1206                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1207                         wildcard = 0;
1208 #ifdef INET6
1209                         if ((inp->inp_vflag & INP_IPV4) == 0)
1210                                 continue;
1211 #endif
1212                         if (inp->inp_faddr.s_addr != INADDR_ANY)
1213                                 wildcard++;
1214                         if (inp->inp_laddr.s_addr != INADDR_ANY) {
1215                                 if (laddr.s_addr == INADDR_ANY)
1216                                         wildcard++;
1217                                 else if (inp->inp_laddr.s_addr != laddr.s_addr)
1218                                         continue;
1219                         } else {
1220                                 if (laddr.s_addr != INADDR_ANY)
1221                                         wildcard++;
1222                         }
1223                         if (wildcard && !wild_okay)
1224                                 continue;
1225                         if (wildcard < matchwild &&
1226                             (cred == NULL ||
1227                              cred->cr_prison ==
1228                                         inp->inp_socket->so_cred->cr_prison)) {
1229                                 match = inp;
1230                                 matchwild = wildcard;
1231                                 if (matchwild == 0) {
1232                                         break;
1233                                 }
1234                         }
1235                 }
1236         }
1237         if (pcbinfo->porttoken)
1238                 lwkt_reltoken(pcbinfo->porttoken);
1239         return (match);
1240 }
1241
1242 struct inpcb *
1243 in_pcblocalgroup_last(const struct inpcbinfo *pcbinfo,
1244     const struct inpcb *inp)
1245 {
1246         const struct inp_localgrphead *hdr;
1247         const struct inp_localgroup *grp;
1248         int i;
1249
1250         if (pcbinfo->localgrphashbase == NULL)
1251                 return NULL;
1252
1253         hdr = &pcbinfo->localgrphashbase[
1254             INP_PCBLOCALGRPHASH(inp->inp_lport, pcbinfo->localgrphashmask)];
1255
1256         LIST_FOREACH(grp, hdr, il_list) {
1257                 if (grp->il_vflag == inp->inp_vflag &&
1258                     grp->il_lport == inp->inp_lport &&
1259                     memcmp(&grp->il_dependladdr,
1260                         &inp->inp_inc.inc_ie.ie_dependladdr,
1261                         sizeof(grp->il_dependladdr)) == 0) {
1262                         break;
1263                 }
1264         }
1265         if (grp == NULL || grp->il_inpcnt == 1)
1266                 return NULL;
1267
1268         KASSERT(grp->il_inpcnt >= 2,
1269             ("invalid localgroup inp count %d", grp->il_inpcnt));
1270         for (i = 0; i < grp->il_inpcnt; ++i) {
1271                 if (grp->il_inp[i] == inp) {
1272                         int last = grp->il_inpcnt - 1;
1273
1274                         if (i == last)
1275                                 last = grp->il_inpcnt - 2;
1276                         return grp->il_inp[last];
1277                 }
1278         }
1279         return NULL;
1280 }
1281
1282 static struct inpcb *
1283 inp_localgroup_lookup(const struct inpcbinfo *pcbinfo,
1284     struct in_addr laddr, uint16_t lport, uint32_t pkt_hash)
1285 {
1286         struct inpcb *local_wild = NULL;
1287         const struct inp_localgrphead *hdr;
1288         const struct inp_localgroup *grp;
1289
1290         hdr = &pcbinfo->localgrphashbase[
1291             INP_PCBLOCALGRPHASH(lport, pcbinfo->localgrphashmask)];
1292 #ifdef INP_LOCALGROUP_HASHTHR
1293         pkt_hash >>= ncpus2_shift;
1294 #endif
1295
1296         /*
1297          * Order of socket selection:
1298          * 1. non-wild.
1299          * 2. wild.
1300          *
1301          * NOTE:
1302          * - Local group does not contain jailed sockets
1303          * - Local group does not contain IPv4 mapped INET6 wild sockets
1304          */
1305         LIST_FOREACH(grp, hdr, il_list) {
1306 #ifdef INET6
1307                 if (!(grp->il_vflag & INP_IPV4))
1308                         continue;
1309 #endif
1310                 if (grp->il_lport == lport) {
1311                         int idx;
1312
1313 #ifdef INP_LOCALGROUP_HASHTHR
1314                         idx = pkt_hash / grp->il_factor;
1315                         KASSERT(idx < grp->il_inpcnt && idx >= 0,
1316                             ("invalid hash %04x, cnt %d or fact %d",
1317                              pkt_hash, grp->il_inpcnt, grp->il_factor));
1318 #else
1319                         /*
1320                          * Modulo-N is used here, which greatly reduces
1321                          * completion queue token contention, thus more
1322                          * cpu time is saved.
1323                          */
1324                         idx = pkt_hash % grp->il_inpcnt;
1325 #endif
1326
1327                         if (grp->il_laddr.s_addr == laddr.s_addr)
1328                                 return grp->il_inp[idx];
1329                         else if (grp->il_laddr.s_addr == INADDR_ANY)
1330                                 local_wild = grp->il_inp[idx];
1331                 }
1332         }
1333         if (local_wild != NULL)
1334                 return local_wild;
1335         return NULL;
1336 }
1337
1338 /*
1339  * Lookup PCB in hash list.
1340  */
1341 struct inpcb *
1342 in_pcblookup_pkthash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1343     u_int fport_arg, struct in_addr laddr, u_int lport_arg,
1344     boolean_t wildcard, struct ifnet *ifp, const struct mbuf *m)
1345 {
1346         struct inpcbhead *head;
1347         struct inpcb *inp, *jinp=NULL;
1348         u_short fport = fport_arg, lport = lport_arg;
1349
1350         /*
1351          * First look for an exact match.
1352          */
1353         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport,
1354             laddr.s_addr, lport, pcbinfo->hashmask)];
1355         LIST_FOREACH(inp, head, inp_hash) {
1356 #ifdef INET6
1357                 if (!(inp->inp_vflag & INP_IPV4))
1358                         continue;
1359 #endif
1360                 if (in_hosteq(inp->inp_faddr, faddr) &&
1361                     in_hosteq(inp->inp_laddr, laddr) &&
1362                     inp->inp_fport == fport && inp->inp_lport == lport) {
1363                         /* found */
1364                         if (inp->inp_socket == NULL ||
1365                             inp->inp_socket->so_cred->cr_prison == NULL) {
1366                                 return (inp);
1367                         } else {
1368                                 if  (jinp == NULL)
1369                                         jinp = inp;
1370                         }
1371                 }
1372         }
1373         if (jinp != NULL)
1374                 return (jinp);
1375         if (wildcard) {
1376                 struct inpcb *local_wild = NULL;
1377                 struct inpcb *jinp_wild = NULL;
1378 #ifdef INET6
1379                 struct inpcb *local_wild_mapped = NULL;
1380 #endif
1381                 struct inpcontainer *ic;
1382                 struct inpcontainerhead *chead;
1383                 struct sockaddr_in jsin;
1384                 struct ucred *cred;
1385
1386                 /*
1387                  * Check local group first
1388                  */
1389                 if (pcbinfo->localgrphashbase != NULL &&
1390                     m != NULL && (m->m_flags & M_HASH) &&
1391                     !(ifp && ifp->if_type == IFT_FAITH)) {
1392                         inp = inp_localgroup_lookup(pcbinfo,
1393                             laddr, lport, m->m_pkthdr.hash);
1394                         if (inp != NULL)
1395                                 return inp;
1396                 }
1397
1398                 /*
1399                  * Order of socket selection:
1400                  * 1. non-jailed, non-wild.
1401                  * 2. non-jailed, wild.
1402                  * 3. jailed, non-wild.
1403                  * 4. jailed, wild.
1404                  */
1405                 jsin.sin_family = AF_INET;
1406                 chead = &pcbinfo->wildcardhashbase[
1407                     INP_PCBWILDCARDHASH(lport, pcbinfo->wildcardhashmask)];
1408                 LIST_FOREACH(ic, chead, ic_list) {
1409                         inp = ic->ic_inp;
1410                         jsin.sin_addr.s_addr = laddr.s_addr;
1411 #ifdef INET6
1412                         if (!(inp->inp_vflag & INP_IPV4))
1413                                 continue;
1414 #endif
1415                         if (inp->inp_socket != NULL)
1416                                 cred = inp->inp_socket->so_cred;
1417                         else
1418                                 cred = NULL;
1419                         if (cred != NULL && jailed(cred)) {
1420                                 if (jinp != NULL)
1421                                         continue;
1422                                 else
1423                                         if (!jailed_ip(cred->cr_prison,
1424                                             (struct sockaddr *)&jsin))
1425                                                 continue;
1426                         }
1427                         if (inp->inp_lport == lport) {
1428                                 if (ifp && ifp->if_type == IFT_FAITH &&
1429                                     !(inp->inp_flags & INP_FAITH))
1430                                         continue;
1431                                 if (inp->inp_laddr.s_addr == laddr.s_addr) {
1432                                         if (cred != NULL && jailed(cred))
1433                                                 jinp = inp;
1434                                         else
1435                                                 return (inp);
1436                                 }
1437                                 if (inp->inp_laddr.s_addr == INADDR_ANY) {
1438 #ifdef INET6
1439                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
1440                                                              AF_INET6))
1441                                                 local_wild_mapped = inp;
1442                                         else
1443 #endif
1444                                                 if (cred != NULL &&
1445                                                     jailed(cred))
1446                                                         jinp_wild = inp;
1447                                                 else
1448                                                         local_wild = inp;
1449                                 }
1450                         }
1451                 }
1452                 if (local_wild != NULL)
1453                         return (local_wild);
1454 #ifdef INET6
1455                 if (local_wild_mapped != NULL)
1456                         return (local_wild_mapped);
1457 #endif
1458                 if (jinp != NULL)
1459                         return (jinp);
1460                 return (jinp_wild);
1461         }
1462
1463         /*
1464          * Not found.
1465          */
1466         return (NULL);
1467 }
1468
1469 struct inpcb *
1470 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1471     u_int fport_arg, struct in_addr laddr, u_int lport_arg,
1472     boolean_t wildcard, struct ifnet *ifp)
1473 {
1474         return in_pcblookup_pkthash(pcbinfo, faddr, fport_arg,
1475             laddr, lport_arg, wildcard, ifp, NULL);
1476 }
1477
1478 /*
1479  * Insert PCB into connection hash table.
1480  */
1481 void
1482 in_pcbinsconnhash(struct inpcb *inp)
1483 {
1484         struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo;
1485         struct inpcbhead *bucket;
1486         u_int32_t hashkey_faddr, hashkey_laddr;
1487
1488 #ifdef INET6
1489         if (inp->inp_vflag & INP_IPV6) {
1490                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */;
1491                 hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */;
1492         } else {
1493 #endif
1494                 hashkey_faddr = inp->inp_faddr.s_addr;
1495                 hashkey_laddr = inp->inp_laddr.s_addr;
1496 #ifdef INET6
1497         }
1498 #endif
1499
1500         KASSERT(!(inp->inp_flags & INP_WILDCARD),
1501                 ("already on wildcardhash"));
1502         KASSERT(!(inp->inp_flags & INP_CONNECTED),
1503                 ("already on connhash"));
1504         inp->inp_flags |= INP_CONNECTED;
1505
1506         /*
1507          * Insert into the connection hash table.
1508          */
1509         bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr,
1510             inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)];
1511         LIST_INSERT_HEAD(bucket, inp, inp_hash);
1512 }
1513
1514 /*
1515  * Remove PCB from connection hash table.
1516  */
1517 void
1518 in_pcbremconnhash(struct inpcb *inp)
1519 {
1520         KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected"));
1521         LIST_REMOVE(inp, inp_hash);
1522         inp->inp_flags &= ~INP_CONNECTED;
1523 }
1524
1525 /*
1526  * Insert PCB into port hash table.
1527  */
1528 int
1529 in_pcbinsporthash(struct inpcb *inp)
1530 {
1531         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1532         struct inpcbporthead *pcbporthash;
1533         struct inpcbport *phd;
1534
1535         /*
1536          * If the porthashbase is shared across several cpus we need
1537          * to lock.
1538          */
1539         if (pcbinfo->porttoken)
1540                 lwkt_gettoken(pcbinfo->porttoken);
1541
1542         /*
1543          * Insert into the port hash table.
1544          */
1545         pcbporthash = &pcbinfo->porthashbase[
1546             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->porthashmask)];
1547
1548         /* Go through port list and look for a head for this lport. */
1549         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1550                 if (phd->phd_port == inp->inp_lport)
1551                         break;
1552         }
1553
1554         /* If none exists, malloc one and tack it on. */
1555         if (phd == NULL) {
1556                 KKASSERT(pcbinfo->portsave != NULL);
1557                 phd = pcbinfo->portsave;
1558                 pcbinfo->portsave = NULL;
1559                 phd->phd_port = inp->inp_lport;
1560                 LIST_INIT(&phd->phd_pcblist);
1561                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1562         }
1563
1564         inp->inp_phd = phd;
1565         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1566
1567         if (pcbinfo->porttoken)
1568                 lwkt_reltoken(pcbinfo->porttoken);
1569         if (pcbinfo->portsave == NULL) {
1570                 pcbinfo->portsave = kmalloc(sizeof(*pcbinfo->portsave),
1571                                             M_PCB, M_INTWAIT | M_ZERO);
1572         }
1573         return (0);
1574 }
1575
1576 static struct inp_localgroup *
1577 inp_localgroup_alloc(struct inp_localgrphead *hdr, u_char vflag,
1578     uint16_t port, const union in_dependaddr *addr, int size)
1579 {
1580         struct inp_localgroup *grp;
1581
1582         grp = kmalloc(__offsetof(struct inp_localgroup, il_inp[size]),
1583             M_TEMP, M_INTWAIT | M_ZERO);
1584         grp->il_vflag = vflag;
1585         grp->il_lport = port;
1586         grp->il_dependladdr = *addr;
1587         grp->il_inpsiz = size;
1588
1589         LIST_INSERT_HEAD(hdr, grp, il_list);
1590
1591         return grp;
1592 }
1593
1594 static void
1595 inp_localgroup_free(struct inp_localgroup *grp)
1596 {
1597         LIST_REMOVE(grp, il_list);
1598         kfree(grp, M_TEMP);
1599 }
1600
1601 static struct inp_localgroup *
1602 inp_localgroup_resize(struct inp_localgrphead *hdr,
1603     struct inp_localgroup *old_grp, int size)
1604 {
1605         struct inp_localgroup *grp;
1606         int i;
1607
1608         grp = inp_localgroup_alloc(hdr, old_grp->il_vflag,
1609             old_grp->il_lport, &old_grp->il_dependladdr, size);
1610
1611         KASSERT(old_grp->il_inpcnt < grp->il_inpsiz,
1612             ("invalid new local group size %d and old local group count %d",
1613              grp->il_inpsiz, old_grp->il_inpcnt));
1614         for (i = 0; i < old_grp->il_inpcnt; ++i)
1615                 grp->il_inp[i] = old_grp->il_inp[i];
1616         grp->il_inpcnt = old_grp->il_inpcnt;
1617         grp->il_factor = old_grp->il_factor;
1618
1619         inp_localgroup_free(old_grp);
1620
1621         return grp;
1622 }
1623
1624 static void
1625 inp_localgroup_factor(struct inp_localgroup *grp)
1626 {
1627         grp->il_factor =
1628             ((uint32_t)(0xffff >> ncpus2_shift) / grp->il_inpcnt) + 1;
1629         KASSERT(grp->il_factor != 0, ("invalid local group factor, "
1630             "ncpus2_shift %d, inpcnt %d", ncpus2_shift, grp->il_inpcnt));
1631 }
1632
1633 static void
1634 in_pcbinslocalgrphash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1635 {
1636         struct inp_localgrphead *hdr;
1637         struct inp_localgroup *grp;
1638         struct ucred *cred;
1639
1640         if (pcbinfo->localgrphashbase == NULL)
1641                 return;
1642
1643         /*
1644          * XXX don't allow jailed socket to join local group
1645          */
1646         if (inp->inp_socket != NULL)
1647                 cred = inp->inp_socket->so_cred;
1648         else
1649                 cred = NULL;
1650         if (cred != NULL && jailed(cred))
1651                 return;
1652
1653 #ifdef INET6
1654         /*
1655          * XXX don't allow IPv4 mapped INET6 wild socket
1656          */
1657         if ((inp->inp_vflag & INP_IPV4) &&
1658             inp->inp_laddr.s_addr == INADDR_ANY &&
1659             INP_CHECK_SOCKAF(inp->inp_socket, AF_INET6))
1660                 return;
1661 #endif
1662
1663         hdr = &pcbinfo->localgrphashbase[
1664             INP_PCBLOCALGRPHASH(inp->inp_lport, pcbinfo->localgrphashmask)];
1665
1666         LIST_FOREACH(grp, hdr, il_list) {
1667                 if (grp->il_vflag == inp->inp_vflag &&
1668                     grp->il_lport == inp->inp_lport &&
1669                     memcmp(&grp->il_dependladdr,
1670                         &inp->inp_inc.inc_ie.ie_dependladdr,
1671                         sizeof(grp->il_dependladdr)) == 0) {
1672                         break;
1673                 }
1674         }
1675         if (grp == NULL) {
1676                 /* Create new local group */
1677                 grp = inp_localgroup_alloc(hdr, inp->inp_vflag,
1678                     inp->inp_lport, &inp->inp_inc.inc_ie.ie_dependladdr,
1679                     INP_LOCALGROUP_SIZMIN);
1680         } else if (grp->il_inpcnt == grp->il_inpsiz) {
1681                 if (grp->il_inpsiz >= INP_LOCALGROUP_SIZMAX) {
1682                         static int limit_logged = 0;
1683
1684                         if (!limit_logged) {
1685                                 limit_logged = 1;
1686                                 kprintf("local group port %d, "
1687                                     "limit reached\n", ntohs(grp->il_lport));
1688                         }
1689                         return;
1690                 }
1691
1692                 /* Expand this local group */
1693                 grp = inp_localgroup_resize(hdr, grp, grp->il_inpsiz * 2);
1694         }
1695
1696         KASSERT(grp->il_inpcnt < grp->il_inpsiz,
1697             ("invalid local group size %d and count %d",
1698              grp->il_inpsiz, grp->il_inpcnt));
1699         grp->il_inp[grp->il_inpcnt] = inp;
1700         grp->il_inpcnt++;
1701         inp_localgroup_factor(grp);
1702 }
1703
1704 void
1705 in_pcbinswildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1706 {
1707         struct inpcontainer *ic;
1708         struct inpcontainerhead *bucket;
1709
1710         in_pcbinslocalgrphash_oncpu(inp, pcbinfo);
1711
1712         bucket = &pcbinfo->wildcardhashbase[
1713             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1714
1715         ic = kmalloc(sizeof(struct inpcontainer), M_TEMP, M_INTWAIT);
1716         ic->ic_inp = inp;
1717         LIST_INSERT_HEAD(bucket, ic, ic_list);
1718 }
1719
1720 /*
1721  * Insert PCB into wildcard hash table.
1722  */
1723 void
1724 in_pcbinswildcardhash(struct inpcb *inp)
1725 {
1726         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1727
1728         KASSERT(!(inp->inp_flags & INP_CONNECTED),
1729                 ("already on connhash"));
1730         KASSERT(!(inp->inp_flags & INP_WILDCARD),
1731                 ("already on wildcardhash"));
1732         inp->inp_flags |= INP_WILDCARD;
1733
1734         in_pcbinswildcardhash_oncpu(inp, pcbinfo);
1735 }
1736
1737 static void
1738 in_pcbremlocalgrphash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1739 {
1740         struct inp_localgrphead *hdr;
1741         struct inp_localgroup *grp;
1742
1743         if (pcbinfo->localgrphashbase == NULL)
1744                 return;
1745
1746         hdr = &pcbinfo->localgrphashbase[
1747             INP_PCBLOCALGRPHASH(inp->inp_lport, pcbinfo->localgrphashmask)];
1748
1749         LIST_FOREACH(grp, hdr, il_list) {
1750                 int i;
1751
1752                 for (i = 0; i < grp->il_inpcnt; ++i) {
1753                         if (grp->il_inp[i] != inp)
1754                                 continue;
1755
1756                         if (grp->il_inpcnt == 1) {
1757                                 /* Free this local group */
1758                                 inp_localgroup_free(grp);
1759                         } else {
1760                                 /* Pull up inpcbs */
1761                                 for (; i + 1 < grp->il_inpcnt; ++i)
1762                                         grp->il_inp[i] = grp->il_inp[i + 1];
1763                                 grp->il_inpcnt--;
1764                                 inp_localgroup_factor(grp);
1765
1766                                 if (grp->il_inpsiz > INP_LOCALGROUP_SIZMIN &&
1767                                     grp->il_inpcnt <= (grp->il_inpsiz / 4)) {
1768                                         /* Shrink this local group */
1769                                         grp = inp_localgroup_resize(hdr, grp,
1770                                             grp->il_inpsiz / 2);
1771                                 }
1772                         }
1773                         return;
1774                 }
1775         }
1776 }
1777
1778 void
1779 in_pcbremwildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1780 {
1781         struct inpcontainer *ic;
1782         struct inpcontainerhead *head;
1783
1784         in_pcbremlocalgrphash_oncpu(inp, pcbinfo);
1785
1786         /* find bucket */
1787         head = &pcbinfo->wildcardhashbase[
1788             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1789
1790         LIST_FOREACH(ic, head, ic_list) {
1791                 if (ic->ic_inp == inp)
1792                         goto found;
1793         }
1794         return;                 /* not found! */
1795
1796 found:
1797         LIST_REMOVE(ic, ic_list);       /* remove container from bucket chain */
1798         kfree(ic, M_TEMP);              /* deallocate container */
1799 }
1800
1801 /*
1802  * Remove PCB from wildcard hash table.
1803  */
1804 void
1805 in_pcbremwildcardhash(struct inpcb *inp)
1806 {
1807         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1808
1809         KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard"));
1810         in_pcbremwildcardhash_oncpu(inp, pcbinfo);
1811         inp->inp_flags &= ~INP_WILDCARD;
1812 }
1813
1814 /*
1815  * Remove PCB from various lists.
1816  */
1817 void
1818 in_pcbremlists(struct inpcb *inp)
1819 {
1820         struct inpcbinfo *pcbinfo;
1821
1822         if (inp->inp_lport) {
1823                 struct inpcbport *phd;
1824
1825                 pcbinfo = inp->inp_pcbinfo;
1826                 if (pcbinfo->porttoken)
1827                         lwkt_gettoken(pcbinfo->porttoken);
1828
1829                 phd = inp->inp_phd;
1830                 LIST_REMOVE(inp, inp_portlist);
1831                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1832                         LIST_REMOVE(phd, phd_hash);
1833                         kfree(phd, M_PCB);
1834                 }
1835                 if (pcbinfo->porttoken)
1836                         lwkt_reltoken(pcbinfo->porttoken);
1837         }
1838         if (inp->inp_flags & INP_WILDCARD) {
1839                 in_pcbremwildcardhash(inp);
1840         } else if (inp->inp_flags & INP_CONNECTED) {
1841                 in_pcbremconnhash(inp);
1842         }
1843         LIST_REMOVE(inp, inp_list);
1844         inp->inp_pcbinfo->ipi_count--;
1845 }
1846
1847 int
1848 prison_xinpcb(struct thread *td, struct inpcb *inp)
1849 {
1850         struct ucred *cr;
1851
1852         if (td->td_proc == NULL)
1853                 return (0);
1854         cr = td->td_proc->p_ucred;
1855         if (cr->cr_prison == NULL)
1856                 return (0);
1857         if (inp->inp_socket && inp->inp_socket->so_cred &&
1858             inp->inp_socket->so_cred->cr_prison &&
1859             cr->cr_prison == inp->inp_socket->so_cred->cr_prison)
1860                 return (0);
1861         return (1);
1862 }
1863
1864 int
1865 in_pcblist_global(SYSCTL_HANDLER_ARGS)
1866 {
1867         struct inpcbinfo *pcbinfo = arg1;
1868         struct inpcb *inp, *marker;
1869         struct xinpcb xi;
1870         int error, i, n;
1871
1872         /*
1873          * The process of preparing the TCB list is too time-consuming and
1874          * resource-intensive to repeat twice on every request.
1875          */
1876         if (req->oldptr == NULL) {
1877                 n = pcbinfo->ipi_count;
1878                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1879                 return 0;
1880         }
1881
1882         if (req->newptr != NULL)
1883                 return EPERM;
1884
1885         /*
1886          * OK, now we're committed to doing something.  Re-fetch ipi_count
1887          * after obtaining the generation count.
1888          */
1889         n = pcbinfo->ipi_count;
1890
1891         marker = kmalloc(sizeof(struct inpcb), M_TEMP, M_WAITOK|M_ZERO);
1892         marker->inp_flags |= INP_PLACEMARKER;
1893         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
1894
1895         i = 0;
1896         error = 0;
1897
1898         while ((inp = LIST_NEXT(marker, inp_list)) != NULL && i < n) {
1899                 LIST_REMOVE(marker, inp_list);
1900                 LIST_INSERT_AFTER(inp, marker, inp_list);
1901
1902                 if (inp->inp_flags & INP_PLACEMARKER)
1903                         continue;
1904                 if (prison_xinpcb(req->td, inp))
1905                         continue;
1906                 bzero(&xi, sizeof xi);
1907                 xi.xi_len = sizeof xi;
1908                 bcopy(inp, &xi.xi_inp, sizeof *inp);
1909                 if (inp->inp_socket)
1910                         sotoxsocket(inp->inp_socket, &xi.xi_socket);
1911                 if ((error = SYSCTL_OUT(req, &xi, sizeof xi)) != 0)
1912                         break;
1913                 ++i;
1914         }
1915         LIST_REMOVE(marker, inp_list);
1916         if (error == 0 && i < n) {
1917                 bzero(&xi, sizeof xi);
1918                 xi.xi_len = sizeof xi;
1919                 while (i < n) {
1920                         error = SYSCTL_OUT(req, &xi, sizeof xi);
1921                         ++i;
1922                 }
1923         }
1924         kfree(marker, M_TEMP);
1925         return(error);
1926 }
1927
1928 int
1929 in_pcblist_global_nomarker(SYSCTL_HANDLER_ARGS, struct xinpcb **xi0, int *nxi0)
1930 {
1931         struct inpcbinfo *pcbinfo = arg1;
1932         struct inpcb *inp;
1933         struct xinpcb *xi;
1934         int nxi;
1935
1936         *nxi0 = 0;
1937         *xi0 = NULL;
1938
1939         /*
1940          * The process of preparing the PCB list is too time-consuming and
1941          * resource-intensive to repeat twice on every request.
1942          */
1943         if (req->oldptr == NULL) {
1944                 int n = pcbinfo->ipi_count;
1945
1946                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1947                 return 0;
1948         }
1949
1950         if (req->newptr != NULL)
1951                 return EPERM;
1952
1953         if (pcbinfo->ipi_count == 0)
1954                 return 0;
1955
1956         nxi = 0;
1957         xi = kmalloc(pcbinfo->ipi_count * sizeof(*xi), M_TEMP,
1958                      M_WAITOK | M_ZERO | M_NULLOK);
1959         if (xi == NULL)
1960                 return ENOMEM;
1961
1962         LIST_FOREACH(inp, &pcbinfo->pcblisthead, inp_list) {
1963                 struct xinpcb *xi_ptr = &xi[nxi];
1964
1965                 if (prison_xinpcb(req->td, inp))
1966                         continue;
1967
1968                 xi_ptr->xi_len = sizeof(*xi_ptr);
1969                 bcopy(inp, &xi_ptr->xi_inp, sizeof(*inp));
1970                 if (inp->inp_socket)
1971                         sotoxsocket(inp->inp_socket, &xi_ptr->xi_socket);
1972                 ++nxi;
1973         }
1974
1975         if (nxi == 0) {
1976                 kfree(xi, M_TEMP);
1977                 return 0;
1978         }
1979
1980         *nxi0 = nxi;
1981         *xi0 = xi;
1982
1983         return 0;
1984 }
1985
1986 void
1987 in_savefaddr(struct socket *so, const struct sockaddr *faddr)
1988 {
1989         struct sockaddr_in *sin;
1990
1991         KASSERT(faddr->sa_family == AF_INET,
1992             ("not AF_INET faddr %d", faddr->sa_family));
1993
1994         sin = kmalloc(sizeof(*sin), M_SONAME, M_WAITOK | M_ZERO);
1995         sin->sin_family = AF_INET;
1996         sin->sin_len = sizeof(*sin);
1997         sin->sin_port = ((const struct sockaddr_in *)faddr)->sin_port;
1998         sin->sin_addr = ((const struct sockaddr_in *)faddr)->sin_addr;
1999
2000         so->so_faddr = (struct sockaddr *)sin;
2001 }