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 static int
 297 in_pcbsetlport(struct inpcb *inp, int wild, struct ucred *cred)
 298 {
 299         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 300         struct inpcbportinfo *portinfo;
 301         u_short first, last, lport, step;
 302         u_short *lastport;
 303         int count, error;
 304         int portinfo_first, portinfo_idx;
 305
 306         inp->inp_flags |= INP_ANONPORT;
 307
 308         step = pcbinfo->portinfo_mask + 1;
 309         portinfo_first = mycpuid & pcbinfo->portinfo_mask;
 310         portinfo_idx = portinfo_first;
 311 loop:
 312         portinfo = &pcbinfo->portinfo[portinfo_idx];
 313
 314         if (inp->inp_flags & INP_HIGHPORT) {
 315                 first = ipport_hifirstauto;     /* sysctl */
 316                 last  = ipport_hilastauto;
 317                 lastport = &portinfo->lasthi;
 318         } else if (inp->inp_flags & INP_LOWPORT) {
 319                 if (cred &&
 320                     (error =
 321                      priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))) {
 322                         inp->inp_laddr.s_addr = INADDR_ANY;
 323                         return error;
 324                 }
 325                 first = ipport_lowfirstauto;    /* 1023 */
 326                 last  = ipport_lowlastauto;     /* 600 */
 327                 lastport = &portinfo->lastlow;
 328         } else {
 329                 first = ipport_firstauto;       /* sysctl */
 330                 last  = ipport_lastauto;
 331                 lastport = &portinfo->lastport;
 332         }
 333
 334         /*
 335          * This has to be atomic.  If the porthash is shared across multiple
 336          * protocol threads (aka tcp) then the token must be held.
 337          */
 338         GET_PORT_TOKEN(portinfo);
 339
 340         /*
 341          * Simple check to ensure all ports are not used up causing
 342          * a deadlock here.
 343          *
 344          * We split the two cases (up and down) so that the direction
 345          * is not being tested on each round of the loop.
 346          */
 347         if (first > last) {
 348                 /*
 349                  * counting down
 350                  */
 351                 in_pcbportrange(&first, &last, portinfo->offset, step);
 352                 count = (first - last) / step;
 353
 354                 do {
 355                         if (count-- < 0) {      /* completely used? */
 356                                 error = EADDRNOTAVAIL;
 357                                 goto done;
 358                         }
 359                         *lastport -= step;
 360                         if (*lastport > first || *lastport < last)
 361                                 *lastport = first;
 362                         KKASSERT((*lastport & pcbinfo->portinfo_mask) ==
 363                             portinfo->offset);
 364                         lport = htons(*lastport);
 365                 } while (in_pcblookup_local(portinfo, inp->inp_laddr, lport,
 366                     wild, cred));
 367         } else {
 368                 /*
 369                  * counting up
 370                  */
 371                 in_pcbportrange(&last, &first, portinfo->offset, step);
 372                 count = (last - first) / step;
 373
 374                 do {
 375                         if (count-- < 0) {      /* completely used? */
 376                                 error = EADDRNOTAVAIL;
 377                                 goto done;
 378                         }
 379                         *lastport += step;
 380                         if (*lastport < first || *lastport > last)
 381                                 *lastport = first;
 382                         KKASSERT((*lastport & pcbinfo->portinfo_mask) ==
 383                             portinfo->offset);
 384                         lport = htons(*lastport);
 385                 } while (in_pcblookup_local(portinfo, inp->inp_laddr, lport,
 386                     wild, cred));
 387         }
 388         inp->inp_lport = lport;
 389         in_pcbinsporthash(portinfo, inp);
 390         error = 0;
 391 done:
 392         REL_PORT_TOKEN(portinfo);
 393
 394         if (error) {
 395                 /* Try next portinfo */
 396                 portinfo_idx++;
 397                 portinfo_idx &= pcbinfo->portinfo_mask;
 398                 if (portinfo_idx != portinfo_first)
 399                         goto loop;
 400                 inp->inp_laddr.s_addr = INADDR_ANY;
 401         }
 402         return error;
 403 }
 404
 405 int
 406 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 407 {
 408         struct socket *so = inp->inp_socket;
 409         struct sockaddr_in jsin;
 410         struct ucred *cred = NULL;
 411         int wild = 0;
 412
 413         if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) /* XXX broken! */
 414                 return (EADDRNOTAVAIL);
 415         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 416                 return (EINVAL);        /* already bound */
 417
 418         if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT)))
 419                 wild = 1;    /* neither SO_REUSEADDR nor SO_REUSEPORT is set */
 420         if (td->td_proc)
 421                 cred = td->td_proc->p_ucred;
 422
 423         if (nam != NULL) {
 424                 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 425                 struct inpcbinfo *pcbinfo;
 426                 struct inpcbportinfo *portinfo;
 427                 struct inpcb *t;
 428                 u_short lport, lport_ho;
 429                 int reuseport = (so->so_options & SO_REUSEPORT);
 430                 int error;
 431
 432                 if (nam->sa_len != sizeof *sin)
 433                         return (EINVAL);
 434 #ifdef notdef
 435                 /*
 436                  * We should check the family, but old programs
 437                  * incorrectly fail to initialize it.
 438                  */
 439                 if (sin->sin_family != AF_INET)
 440                         return (EAFNOSUPPORT);
 441 #endif
 442                 if (!prison_replace_wildcards(td, nam))
 443                         return (EINVAL);
 444
 445                 lport = sin->sin_port;
 446                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 447                         /*
 448                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 449                          * allow complete duplication of binding if
 450                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 451                          * and a multicast address is bound on both
 452                          * new and duplicated sockets.
 453                          */
 454                         if (so->so_options & SO_REUSEADDR)
 455                                 reuseport = SO_REUSEADDR | SO_REUSEPORT;
 456                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 457                         sin->sin_port = 0;              /* yech... */
 458                         bzero(&sin->sin_zero, sizeof sin->sin_zero);
 459                         if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL)
 460                                 return (EADDRNOTAVAIL);
 461                 }
 462
 463                 inp->inp_laddr = sin->sin_addr;
 464
 465                 jsin.sin_family = AF_INET;
 466                 jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 467                 if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
 468                         inp->inp_laddr.s_addr = INADDR_ANY;
 469                         return (EINVAL);
 470                 }
 471                 inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 472
 473                 if (lport == 0) {
 474                         /* Auto-select local port */
 475                         return in_pcbsetlport(inp, wild, cred);
 476                 }
 477                 lport_ho = ntohs(lport);
 478
 479                 /* GROSS */
 480                 if (lport_ho < IPPORT_RESERVED && cred &&
 481                     (error =
 482                      priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))) {
 483                         inp->inp_laddr.s_addr = INADDR_ANY;
 484                         return (error);
 485                 }
 486
 487                 /*
 488                  * Locate the proper portinfo based on lport
 489                  */
 490                 pcbinfo = inp->inp_pcbinfo;
 491                 portinfo =
 492                     &pcbinfo->portinfo[lport_ho & pcbinfo->portinfo_mask];
 493                 KKASSERT((lport_ho & pcbinfo->portinfo_mask) ==
 494                     portinfo->offset);
 495
 496                 /*
 497                  * This has to be atomic.  If the porthash is shared across
 498                  * multiple protocol threads (aka tcp) then the token must
 499                  * be held.
 500                  */
 501                 GET_PORT_TOKEN(portinfo);
 502
 503                 if (so->so_cred->cr_uid != 0 &&
 504                     !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 505                         t = in_pcblookup_local(portinfo, sin->sin_addr, lport,
 506                             INPLOOKUP_WILDCARD, cred);
 507                         if (t &&
 508                             (!in_nullhost(sin->sin_addr) ||
 509                              !in_nullhost(t->inp_laddr) ||
 510                              (t->inp_socket->so_options & SO_REUSEPORT) == 0) &&
 511                             (so->so_cred->cr_uid !=
 512                              t->inp_socket->so_cred->cr_uid)) {
 513 #ifdef INET6
 514                                 if (!in_nullhost(sin->sin_addr) ||
 515                                     !in_nullhost(t->inp_laddr) ||
 516                                     INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
 517 #endif
 518                                 {
 519                                         inp->inp_laddr.s_addr = INADDR_ANY;
 520                                         error = EADDRINUSE;
 521                                         goto done;
 522                                 }
 523                         }
 524                 }
 525                 if (cred && !prison_replace_wildcards(td, nam)) {
 526                         inp->inp_laddr.s_addr = INADDR_ANY;
 527                         error = EADDRNOTAVAIL;
 528                         goto done;
 529                 }
 530                 t = in_pcblookup_local(portinfo, sin->sin_addr, lport,
 531                     wild, cred);
 532                 if (t && !(reuseport & t->inp_socket->so_options)) {
 533 #ifdef INET6
 534                         if (!in_nullhost(sin->sin_addr) ||
 535                             !in_nullhost(t->inp_laddr) ||
 536                             INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
 537 #endif
 538                         {
 539                                 inp->inp_laddr.s_addr = INADDR_ANY;
 540                                 error = EADDRINUSE;
 541                                 goto done;
 542                         }
 543                 }
 544                 inp->inp_lport = lport;
 545                 in_pcbinsporthash(portinfo, inp);
 546                 error = 0;
 547 done:
 548                 REL_PORT_TOKEN(portinfo);
 549                 return (error);
 550         } else {
 551                 jsin.sin_family = AF_INET;
 552                 jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 553                 if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
 554                         inp->inp_laddr.s_addr = INADDR_ANY;
 555                         return (EINVAL);
 556                 }
 557                 inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 558
 559                 return in_pcbsetlport(inp, wild, cred);
 560         }
 561 }
 562
 563 static struct inpcb *
 564 in_pcblookup_localremote(struct inpcbportinfo *portinfo, struct in_addr laddr,
 565     u_short lport, struct in_addr faddr, u_short fport, struct ucred *cred)
 566 {
 567         struct inpcb *inp;
 568         struct inpcbporthead *porthash;
 569         struct inpcbport *phd;
 570         struct inpcb *match = NULL;
 571
 572         /*
 573          * If the porthashbase is shared across several cpus, it must
 574          * have been locked.
 575          */
 576         ASSERT_PORT_TOKEN_HELD(portinfo);
 577
 578         /*
 579          * Best fit PCB lookup.
 580          *
 581          * First see if this local port is in use by looking on the
 582          * port hash list.
 583          */
 584         porthash = &portinfo->porthashbase[
 585                         INP_PCBPORTHASH(lport, portinfo->porthashmask)];
 586         LIST_FOREACH(phd, porthash, phd_hash) {
 587                 if (phd->phd_port == lport)
 588                         break;
 589         }
 590         if (phd != NULL) {
 591                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 592 #ifdef INET6
 593                         if ((inp->inp_vflag & INP_IPV4) == 0)
 594                                 continue;
 595 #endif
 596                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 597                             inp->inp_laddr.s_addr != laddr.s_addr)
 598                                 continue;
 599
 600                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 601                             inp->inp_faddr.s_addr != faddr.s_addr)
 602                                 continue;
 603
 604                         if (inp->inp_fport != 0 && inp->inp_fport != fport)
 605                                 continue;
 606
 607                         if (cred == NULL ||
 608                             cred->cr_prison ==
 609                             inp->inp_socket->so_cred->cr_prison) {
 610                                 match = inp;
 611                                 break;
 612                         }
 613                 }
 614         }
 615         return (match);
 616 }
 617
 618 int
 619 in_pcbsetlport_remote(struct inpcb *inp, const struct sockaddr *remote,
 620     struct thread *td)
 621 {
 622         struct proc *p = td->td_proc;
 623         unsigned short *lastport;
 624         const struct sockaddr_in *sin = (const struct sockaddr_in *)remote;
 625         struct sockaddr_in jsin;
 626         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 627         struct inpcbportinfo *portinfo;
 628         struct ucred *cred = NULL;
 629         u_short first, last, lport, step;
 630         int count, error, dup;
 631         int portinfo_first, portinfo_idx;
 632
 633         if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) /* XXX broken! */
 634                 return (EADDRNOTAVAIL);
 635
 636         KKASSERT(inp->inp_laddr.s_addr != INADDR_ANY);
 637         if (inp->inp_lport != 0)
 638                 return (EINVAL);        /* already bound */
 639
 640         KKASSERT(p);
 641         cred = p->p_ucred;
 642
 643         jsin.sin_family = AF_INET;
 644         jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
 645         if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
 646                 inp->inp_laddr.s_addr = INADDR_ANY;
 647                 return (EINVAL);
 648         }
 649         inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;
 650
 651         inp->inp_flags |= INP_ANONPORT;
 652
 653         step = pcbinfo->portinfo_mask + 1;
 654         portinfo_first = mycpuid & pcbinfo->portinfo_mask;
 655         portinfo_idx = portinfo_first;
 656 loop:
 657         portinfo = &pcbinfo->portinfo[portinfo_idx];
 658         dup = 0;
 659
 660         if (inp->inp_flags & INP_HIGHPORT) {
 661                 first = ipport_hifirstauto;     /* sysctl */
 662                 last  = ipport_hilastauto;
 663                 lastport = &portinfo->lasthi;
 664         } else if (inp->inp_flags & INP_LOWPORT) {
 665                 if (cred &&
 666                     (error =
 667                      priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))) {
 668                         inp->inp_laddr.s_addr = INADDR_ANY;
 669                         return (error);
 670                 }
 671                 first = ipport_lowfirstauto;    /* 1023 */
 672                 last  = ipport_lowlastauto;     /* 600 */
 673                 lastport = &portinfo->lastlow;
 674         } else {
 675                 first = ipport_firstauto;       /* sysctl */
 676                 last  = ipport_lastauto;
 677                 lastport = &portinfo->lastport;
 678         }
 679
 680         /*
 681          * This has to be atomic.  If the porthash is shared across multiple
 682          * protocol threads (aka tcp) then the token must be held.
 683          */
 684         GET_PORT_TOKEN(portinfo);
 685
 686 again:
 687         /*
 688          * Simple check to ensure all ports are not used up causing
 689          * a deadlock here.
 690          *
 691          * We split the two cases (up and down) so that the direction
 692          * is not being tested on each round of the loop.
 693          */
 694         if (first > last) {
 695                 /*
 696                  * counting down
 697                  */
 698                 in_pcbportrange(&first, &last, portinfo->offset, step);
 699                 count = (first - last) / step;
 700
 701                 do {
 702                         if (count-- < 0) {      /* completely used? */
 703                                 error = EADDRNOTAVAIL;
 704                                 goto done;
 705                         }
 706                         *lastport -= step;
 707                         if (*lastport > first || *lastport < last)
 708                                 *lastport = first;
 709                         KKASSERT((*lastport & pcbinfo->portinfo_mask) ==
 710                             portinfo->offset);
 711                         lport = htons(*lastport);
 712                 } while (in_pcblookup_localremote(portinfo, inp->inp_laddr,
 713                     lport, sin->sin_addr, sin->sin_port, cred));
 714         } else {
 715                 /*
 716                  * counting up
 717                  */
 718                 in_pcbportrange(&last, &first, portinfo->offset, step);
 719                 count = (last - first) / step;
 720
 721                 do {
 722                         if (count-- < 0) {      /* completely used? */
 723                                 error = EADDRNOTAVAIL;
 724                                 goto done;
 725                         }
 726                         *lastport += step;
 727                         if (*lastport < first || *lastport > last)
 728                                 *lastport = first;
 729                         KKASSERT((*lastport & pcbinfo->portinfo_mask) ==
 730                             portinfo->offset);
 731                         lport = htons(*lastport);
 732                 } while (in_pcblookup_localremote(portinfo, inp->inp_laddr,
 733                     lport, sin->sin_addr, sin->sin_port, cred));
 734         }
 735
 736         /* This could happen on loopback interface */
 737         if (sin->sin_port == lport &&
 738             sin->sin_addr.s_addr == inp->inp_laddr.s_addr) {
 739                 if (dup) {
 740                         /*
 741                          * Duplicate again; give up
 742                          */
 743                         error = EADDRNOTAVAIL;
 744                         goto done;
 745                 }
 746                 dup = 1;
 747                 goto again;
 748         }
 749         inp->inp_lport = lport;
 750         in_pcbinsporthash(portinfo, inp);
 751         error = 0;
 752 done:
 753         REL_PORT_TOKEN(portinfo);
 754
 755         if (error) {
 756                 /* Try next portinfo */
 757                 portinfo_idx++;
 758                 portinfo_idx &= pcbinfo->portinfo_mask;
 759                 if (portinfo_idx != portinfo_first)
 760                         goto loop;
 761                 inp->inp_laddr.s_addr = INADDR_ANY;
 762         }
 763         return error;
 764 }
 765
 766 /*
 767  *   Transform old in_pcbconnect() into an inner subroutine for new
 768  *   in_pcbconnect(): Do some validity-checking on the remote
 769  *   address (in mbuf 'nam') and then determine local host address
 770  *   (i.e., which interface) to use to access that remote host.
 771  *
 772  *   This preserves definition of in_pcbconnect(), while supporting a
 773  *   slightly different version for T/TCP.  (This is more than
 774  *   a bit of a kludge, but cleaning up the internal interfaces would
 775  *   have forced minor changes in every protocol).
 776  */
 777 int
 778 in_pcbladdr_find(struct inpcb *inp, struct sockaddr *nam,
 779     struct sockaddr_in **plocal_sin, struct thread *td, int find)
 780 {
 781         struct in_ifaddr *ia;
 782         struct ucred *cred = NULL;
 783         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 784         struct sockaddr *jsin;
 785         int jailed = 0, alloc_route = 0;
 786
 787         if (nam->sa_len != sizeof *sin)
 788                 return (EINVAL);
 789         if (sin->sin_family != AF_INET)
 790                 return (EAFNOSUPPORT);
 791         if (sin->sin_port == 0)
 792                 return (EADDRNOTAVAIL);
 793         if (td && td->td_proc && td->td_proc->p_ucred)
 794                 cred = td->td_proc->p_ucred;
 795         if (cred && cred->cr_prison)
 796                 jailed = 1;
 797         if (!TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) {
 798                 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
 799                 /*
 800                  * If the destination address is INADDR_ANY,
 801                  * use the primary local address.
 802                  * If the supplied address is INADDR_BROADCAST,
 803                  * and the primary interface supports broadcast,
 804                  * choose the broadcast address for that interface.
 805                  */
 806                 if (sin->sin_addr.s_addr == INADDR_ANY)
 807                         sin->sin_addr = IA_SIN(ia)->sin_addr;
 808                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
 809                     (ia->ia_ifp->if_flags & IFF_BROADCAST))
 810                         sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
 811         }
 812         if (find) {
 813                 struct route *ro;
 814
 815                 ia = NULL;
 816                 /*
 817                  * If route is known or can be allocated now,
 818                  * our src addr is taken from the i/f, else punt.
 819                  * Note that we should check the address family of the cached
 820                  * destination, in case of sharing the cache with IPv6.
 821                  */
 822                 ro = &inp->inp_route;
 823                 if (ro->ro_rt &&
 824                     (!(ro->ro_rt->rt_flags & RTF_UP) ||
 825                      ro->ro_dst.sa_family != AF_INET ||
 826                      satosin(&ro->ro_dst)->sin_addr.s_addr !=
 827                                       sin->sin_addr.s_addr ||
 828                      inp->inp_socket->so_options & SO_DONTROUTE)) {
 829                         RTFREE(ro->ro_rt);
 830                         ro->ro_rt = NULL;
 831                 }
 832                 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 833                     (ro->ro_rt == NULL ||
 834                     ro->ro_rt->rt_ifp == NULL)) {
 835                         /* No route yet, so try to acquire one */
 836                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 837                         ro->ro_dst.sa_family = AF_INET;
 838                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 839                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
 840                                 sin->sin_addr;
 841                         rtalloc(ro);
 842                         alloc_route = 1;
 843                 }
 844                 /*
 845                  * If we found a route, use the address
 846                  * corresponding to the outgoing interface
 847                  * unless it is the loopback (in case a route
 848                  * to our address on another net goes to loopback).
 849                  */
 850                 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) {
 851                         if (jailed) {
 852                                 if (jailed_ip(cred->cr_prison,
 853                                     ro->ro_rt->rt_ifa->ifa_addr)) {
 854                                         ia = ifatoia(ro->ro_rt->rt_ifa);
 855                                 }
 856                         } else {
 857                                 ia = ifatoia(ro->ro_rt->rt_ifa);
 858                         }
 859                 }
 860                 if (ia == NULL) {
 861                         u_short fport = sin->sin_port;
 862
 863                         sin->sin_port = 0;
 864                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
 865                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 866                             sintosa(&ia->ia_addr)))
 867                                 ia = NULL;
 868                         if (ia == NULL)
 869                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
 870                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 871                             sintosa(&ia->ia_addr)))
 872                                 ia = NULL;
 873                         sin->sin_port = fport;
 874                         if (ia == NULL &&
 875                             !TAILQ_EMPTY(&in_ifaddrheads[mycpuid]))
 876                                 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
 877                         if (ia && jailed && !jailed_ip(cred->cr_prison,
 878                             sintosa(&ia->ia_addr)))
 879                                 ia = NULL;
 880
 881                         if (!jailed && ia == NULL)
 882                                 goto fail;
 883                 }
 884                 /*
 885                  * If the destination address is multicast and an outgoing
 886                  * interface has been set as a multicast option, use the
 887                  * address of that interface as our source address.
 888                  */
 889                 if (!jailed && IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 890                     inp->inp_moptions != NULL) {
 891                         struct ip_moptions *imo;
 892                         struct ifnet *ifp;
 893
 894                         imo = inp->inp_moptions;
 895                         if (imo->imo_multicast_ifp != NULL) {
 896                                 struct in_ifaddr_container *iac;
 897
 898                                 ifp = imo->imo_multicast_ifp;
 899                                 ia = NULL;
 900                                 TAILQ_FOREACH(iac,
 901                                 &in_ifaddrheads[mycpuid], ia_link) {
 902                                         if (iac->ia->ia_ifp == ifp) {
 903                                                 ia = iac->ia;
 904                                                 break;
 905                                         }
 906                                 }
 907                                 if (ia == NULL)
 908                                         goto fail;
 909                         }
 910                 }
 911                 /*
 912                  * Don't do pcblookup call here; return interface in plocal_sin
 913                  * and exit to caller, that will do the lookup.
 914                  */
 915                 if (ia == NULL && jailed) {
 916                         if ((jsin = prison_get_nonlocal(cred->cr_prison, AF_INET, NULL)) != NULL ||
 917                             (jsin = prison_get_local(cred->cr_prison, AF_INET, NULL)) != NULL) {
 918                                 *plocal_sin = satosin(jsin);
 919                         } else {
 920                                 /* IPv6 only Jail */
 921                                 goto fail;
 922                         }
 923                 } else {
 924                         *plocal_sin = &ia->ia_addr;
 925                 }
 926         }
 927         return (0);
 928 fail:
 929         if (alloc_route) {
 930                 struct route *ro = &inp->inp_route;
 931
 932                 if (ro->ro_rt != NULL)
 933                         RTFREE(ro->ro_rt);
 934                 bzero(ro, sizeof(*ro));
 935         }
 936         return (EADDRNOTAVAIL);
 937 }
 938
 939 int
 940 in_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 941     struct sockaddr_in **plocal_sin, struct thread *td)
 942 {
 943         return in_pcbladdr_find(inp, nam, plocal_sin, td,
 944             (inp->inp_laddr.s_addr == INADDR_ANY));
 945 }
 946
 947 /*
 948  * Outer subroutine:
 949  * Connect from a socket to a specified address.
 950  * Both address and port must be specified in argument sin.
 951  * If don't have a local address for this socket yet,
 952  * then pick one.
 953  */
 954 int
 955 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 956 {
 957         struct sockaddr_in *if_sin;
 958         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 959         int error;
 960
 961         /* Call inner routine to assign local interface address. */
 962         if ((error = in_pcbladdr(inp, nam, &if_sin, td)) != 0)
 963                 return (error);
 964
 965         if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port,
 966                               inp->inp_laddr.s_addr ?
 967                                 inp->inp_laddr : if_sin->sin_addr,
 968                               inp->inp_lport, FALSE, NULL) != NULL) {
 969                 return (EADDRINUSE);
 970         }
 971         if (inp->inp_laddr.s_addr == INADDR_ANY) {
 972                 if (inp->inp_lport == 0) {
 973                         error = in_pcbbind(inp, NULL, td);
 974                         if (error)
 975                                 return (error);
 976                 }
 977                 inp->inp_laddr = if_sin->sin_addr;
 978         }
 979         inp->inp_faddr = sin->sin_addr;
 980         inp->inp_fport = sin->sin_port;
 981         in_pcbinsconnhash(inp);
 982         return (0);
 983 }
 984
 985 void
 986 in_pcbdisconnect(struct inpcb *inp)
 987 {
 988
 989         inp->inp_faddr.s_addr = INADDR_ANY;
 990         inp->inp_fport = 0;
 991         in_pcbremconnhash(inp);
 992         if (inp->inp_socket->so_state & SS_NOFDREF)
 993                 in_pcbdetach(inp);
 994 }
 995
 996 void
 997 in_pcbdetach(struct inpcb *inp)
 998 {
 999         struct socket *so = inp->inp_socket;
1000         struct inpcbinfo *ipi = inp->inp_pcbinfo;
1001
1002 #ifdef IPSEC
1003         ipsec4_delete_pcbpolicy(inp);
1004 #endif /*IPSEC*/
1005         inp->inp_gencnt = ++ipi->ipi_gencnt;
1006         KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
1007         in_pcbremlists(inp);
1008         so->so_pcb = NULL;
1009         sofree(so);                     /* remove pcb ref */
1010         if (inp->inp_options)
1011                 m_free(inp->inp_options);
1012         if (inp->inp_route.ro_rt)
1013                 rtfree(inp->inp_route.ro_rt);
1014         ip_freemoptions(inp->inp_moptions);
1015         inp->inp_vflag = 0;
1016         kfree(inp, M_PCB);
1017 }
1018
1019 /*
1020  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
1021  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
1022  * in struct pr_usrreqs, so that protocols can just reference then directly
1023  * without the need for a wrapper function.  The socket must have a valid
1024  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
1025  * except through a kernel programming error, so it is acceptable to panic
1026  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
1027  * because there actually /is/ a programming error somewhere... XXX)
1028  */
1029 int
1030 in_setsockaddr(struct socket *so, struct sockaddr **nam)
1031 {
1032         struct inpcb *inp;
1033         struct sockaddr_in *sin;
1034
1035         /*
1036          * Do the malloc first in case it blocks.
1037          */
1038         sin = kmalloc(sizeof *sin, M_SONAME, M_WAITOK | M_ZERO);
1039         sin->sin_family = AF_INET;
1040         sin->sin_len = sizeof *sin;
1041
1042         crit_enter();
1043         inp = so->so_pcb;
1044         if (!inp) {
1045                 crit_exit();
1046                 kfree(sin, M_SONAME);
1047                 return (ECONNRESET);
1048         }
1049         sin->sin_port = inp->inp_lport;
1050         sin->sin_addr = inp->inp_laddr;
1051         crit_exit();
1052
1053         *nam = (struct sockaddr *)sin;
1054         return (0);
1055 }
1056
1057 void
1058 in_setsockaddr_dispatch(netmsg_t msg)
1059 {
1060         int error;
1061
1062         error = in_setsockaddr(msg->base.nm_so, msg->peeraddr.nm_nam);
1063         lwkt_replymsg(&msg->lmsg, error);
1064 }
1065
1066 int
1067 in_setpeeraddr(struct socket *so, struct sockaddr **nam)
1068 {
1069         struct inpcb *inp;
1070         struct sockaddr_in *sin;
1071
1072         /*
1073          * Do the malloc first in case it blocks.
1074          */
1075         sin = kmalloc(sizeof *sin, M_SONAME, M_WAITOK | M_ZERO);
1076         sin->sin_family = AF_INET;
1077         sin->sin_len = sizeof *sin;
1078
1079         crit_enter();
1080         inp = so->so_pcb;
1081         if (!inp) {
1082                 crit_exit();
1083                 kfree(sin, M_SONAME);
1084                 return (ECONNRESET);
1085         }
1086         sin->sin_port = inp->inp_fport;
1087         sin->sin_addr = inp->inp_faddr;
1088         crit_exit();
1089
1090         *nam = (struct sockaddr *)sin;
1091         return (0);
1092 }
1093
1094 void
1095 in_setpeeraddr_dispatch(netmsg_t msg)
1096 {
1097         int error;
1098
1099         error = in_setpeeraddr(msg->base.nm_so, msg->peeraddr.nm_nam);
1100         lwkt_replymsg(&msg->lmsg, error);
1101 }
1102
1103 void
1104 in_pcbnotifyall(struct inpcbhead *head, struct in_addr faddr, int err,
1105                 void (*notify)(struct inpcb *, int))
1106 {
1107         struct inpcb *inp, *ninp;
1108
1109         /*
1110          * note: if INP_PLACEMARKER is set we must ignore the rest of
1111          * the structure and skip it.
1112          */
1113         crit_enter();
1114         LIST_FOREACH_MUTABLE(inp, head, inp_list, ninp) {
1115                 if (inp->inp_flags & INP_PLACEMARKER)
1116                         continue;
1117 #ifdef INET6
1118                 if (!(inp->inp_vflag & INP_IPV4))
1119                         continue;
1120 #endif
1121                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1122                     inp->inp_socket == NULL)
1123                         continue;
1124                 (*notify)(inp, err);            /* can remove inp from list! */
1125         }
1126         crit_exit();
1127 }
1128
1129 void
1130 in_pcbpurgeif0(struct inpcb *head, struct ifnet *ifp)
1131 {
1132         struct inpcb *inp;
1133         struct ip_moptions *imo;
1134         int i, gap;
1135
1136         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
1137                 if (inp->inp_flags & INP_PLACEMARKER)
1138                         continue;
1139                 imo = inp->inp_moptions;
1140                 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) {
1141                         /*
1142                          * Unselect the outgoing interface if it is being
1143                          * detached.
1144                          */
1145                         if (imo->imo_multicast_ifp == ifp)
1146                                 imo->imo_multicast_ifp = NULL;
1147
1148                         /*
1149                          * Drop multicast group membership if we joined
1150                          * through the interface being detached.
1151                          */
1152                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1153                             i++) {
1154                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1155                                         in_delmulti(imo->imo_membership[i]);
1156                                         gap++;
1157                                 } else if (gap != 0)
1158                                         imo->imo_membership[i - gap] =
1159                                             imo->imo_membership[i];
1160                         }
1161                         imo->imo_num_memberships -= gap;
1162                 }
1163         }
1164 }
1165
1166 /*
1167  * Check for alternatives when higher level complains
1168  * about service problems.  For now, invalidate cached
1169  * routing information.  If the route was created dynamically
1170  * (by a redirect), time to try a default gateway again.
1171  */
1172 void
1173 in_losing(struct inpcb *inp)
1174 {
1175         struct rtentry *rt;
1176         struct rt_addrinfo rtinfo;
1177
1178         if ((rt = inp->inp_route.ro_rt)) {
1179                 bzero(&rtinfo, sizeof(struct rt_addrinfo));
1180                 rtinfo.rti_info[RTAX_DST] = rt_key(rt);
1181                 rtinfo.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1182                 rtinfo.rti_info[RTAX_NETMASK] = rt_mask(rt);
1183                 rtinfo.rti_flags = rt->rt_flags;
1184                 rt_missmsg(RTM_LOSING, &rtinfo, rt->rt_flags, 0);
1185                 if (rt->rt_flags & RTF_DYNAMIC) {
1186                         rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1187                             rt_mask(rt), rt->rt_flags, NULL);
1188                 }
1189                 inp->inp_route.ro_rt = NULL;
1190                 rtfree(rt);
1191                 /*
1192                  * A new route can be allocated
1193                  * the next time output is attempted.
1194                  */
1195         }
1196 }
1197
1198 /*
1199  * After a routing change, flush old routing
1200  * and allocate a (hopefully) better one.
1201  */
1202 void
1203 in_rtchange(struct inpcb *inp, int err)
1204 {
1205         if (inp->inp_route.ro_rt) {
1206                 rtfree(inp->inp_route.ro_rt);
1207                 inp->inp_route.ro_rt = NULL;
1208                 /*
1209                  * A new route can be allocated the next time
1210                  * output is attempted.
1211                  */
1212         }
1213 }
1214
1215 /*
1216  * Lookup a PCB based on the local address and port.
1217  */
1218 struct inpcb *
1219 in_pcblookup_local(struct inpcbportinfo *portinfo, struct in_addr laddr,
1220                    u_int lport_arg, int wild_okay, struct ucred *cred)
1221 {
1222         struct inpcb *inp;
1223         int matchwild = 3, wildcard;
1224         u_short lport = lport_arg;
1225         struct inpcbporthead *porthash;
1226         struct inpcbport *phd;
1227         struct inpcb *match = NULL;
1228
1229         /*
1230          * If the porthashbase is shared across several cpus, it must
1231          * have been locked.
1232          */
1233         ASSERT_PORT_TOKEN_HELD(portinfo);
1234
1235         /*
1236          * Best fit PCB lookup.
1237          *
1238          * First see if this local port is in use by looking on the
1239          * port hash list.
1240          */
1241         porthash = &portinfo->porthashbase[
1242                         INP_PCBPORTHASH(lport, portinfo->porthashmask)];
1243         LIST_FOREACH(phd, porthash, phd_hash) {
1244                 if (phd->phd_port == lport)
1245                         break;
1246         }
1247         if (phd != NULL) {
1248                 /*
1249                  * Port is in use by one or more PCBs. Look for best
1250                  * fit.
1251                  */
1252                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1253                         wildcard = 0;
1254 #ifdef INET6
1255                         if ((inp->inp_vflag & INP_IPV4) == 0)
1256                                 continue;
1257 #endif
1258                         if (inp->inp_faddr.s_addr != INADDR_ANY)
1259                                 wildcard++;
1260                         if (inp->inp_laddr.s_addr != INADDR_ANY) {
1261                                 if (laddr.s_addr == INADDR_ANY)
1262                                         wildcard++;
1263                                 else if (inp->inp_laddr.s_addr != laddr.s_addr)
1264                                         continue;
1265                         } else {
1266                                 if (laddr.s_addr != INADDR_ANY)
1267                                         wildcard++;
1268                         }
1269                         if (wildcard && !wild_okay)
1270                                 continue;
1271                         if (wildcard < matchwild &&
1272                             (cred == NULL ||
1273                              cred->cr_prison ==
1274                                         inp->inp_socket->so_cred->cr_prison)) {
1275                                 match = inp;
1276                                 matchwild = wildcard;
1277                                 if (matchwild == 0) {
1278                                         break;
1279                                 }
1280                         }
1281                 }
1282         }
1283         return (match);
1284 }
1285
1286 struct inpcb *
1287 in_pcblocalgroup_last(const struct inpcbinfo *pcbinfo,
1288     const struct inpcb *inp)
1289 {
1290         const struct inp_localgrphead *hdr;
1291         const struct inp_localgroup *grp;
1292         int i;
1293
1294         if (pcbinfo->localgrphashbase == NULL)
1295                 return NULL;
1296
1297         hdr = &pcbinfo->localgrphashbase[
1298             INP_PCBLOCALGRPHASH(inp->inp_lport, pcbinfo->localgrphashmask)];
1299
1300         LIST_FOREACH(grp, hdr, il_list) {
1301                 if (grp->il_vflag == inp->inp_vflag &&
1302                     grp->il_lport == inp->inp_lport &&
1303                     memcmp(&grp->il_dependladdr,
1304                         &inp->inp_inc.inc_ie.ie_dependladdr,
1305                         sizeof(grp->il_dependladdr)) == 0) {
1306                         break;
1307                 }
1308         }
1309         if (grp == NULL || grp->il_inpcnt == 1)
1310                 return NULL;
1311
1312         KASSERT(grp->il_inpcnt >= 2,
1313             ("invalid localgroup inp count %d", grp->il_inpcnt));
1314         for (i = 0; i < grp->il_inpcnt; ++i) {
1315                 if (grp->il_inp[i] == inp) {
1316                         int last = grp->il_inpcnt - 1;
1317
1318                         if (i == last)
1319                                 last = grp->il_inpcnt - 2;
1320                         return grp->il_inp[last];
1321                 }
1322         }
1323         return NULL;
1324 }
1325
1326 static struct inpcb *
1327 inp_localgroup_lookup(const struct inpcbinfo *pcbinfo,
1328     struct in_addr laddr, uint16_t lport, uint32_t pkt_hash)
1329 {
1330         struct inpcb *local_wild = NULL;
1331         const struct inp_localgrphead *hdr;
1332         const struct inp_localgroup *grp;
1333
1334         hdr = &pcbinfo->localgrphashbase[
1335             INP_PCBLOCALGRPHASH(lport, pcbinfo->localgrphashmask)];
1336 #ifdef INP_LOCALGROUP_HASHTHR
1337         pkt_hash >>= ncpus2_shift;
1338 #endif
1339
1340         /*
1341          * Order of socket selection:
1342          * 1. non-wild.
1343          * 2. wild.
1344          *
1345          * NOTE:
1346          * - Local group does not contain jailed sockets
1347          * - Local group does not contain IPv4 mapped INET6 wild sockets
1348          */
1349         LIST_FOREACH(grp, hdr, il_list) {
1350 #ifdef INET6
1351                 if (!(grp->il_vflag & INP_IPV4))
1352                         continue;
1353 #endif
1354                 if (grp->il_lport == lport) {
1355                         int idx;
1356
1357 #ifdef INP_LOCALGROUP_HASHTHR
1358                         idx = pkt_hash / grp->il_factor;
1359                         KASSERT(idx < grp->il_inpcnt && idx >= 0,
1360                             ("invalid hash %04x, cnt %d or fact %d",
1361                              pkt_hash, grp->il_inpcnt, grp->il_factor));
1362 #else
1363                         /*
1364                          * Modulo-N is used here, which greatly reduces
1365                          * completion queue token contention, thus more
1366                          * cpu time is saved.
1367                          */
1368                         idx = pkt_hash % grp->il_inpcnt;
1369 #endif
1370
1371                         if (grp->il_laddr.s_addr == laddr.s_addr)
1372                                 return grp->il_inp[idx];
1373                         else if (grp->il_laddr.s_addr == INADDR_ANY)
1374                                 local_wild = grp->il_inp[idx];
1375                 }
1376         }
1377         if (local_wild != NULL)
1378                 return local_wild;
1379         return NULL;
1380 }
1381
1382 /*
1383  * Lookup PCB in hash list.
1384  */
1385 struct inpcb *
1386 in_pcblookup_pkthash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1387     u_int fport_arg, struct in_addr laddr, u_int lport_arg,
1388     boolean_t wildcard, struct ifnet *ifp, const struct mbuf *m)
1389 {
1390         struct inpcbhead *head;
1391         struct inpcb *inp, *jinp=NULL;
1392         u_short fport = fport_arg, lport = lport_arg;
1393
1394         /*
1395          * First look for an exact match.
1396          */
1397         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport,
1398             laddr.s_addr, lport, pcbinfo->hashmask)];
1399         LIST_FOREACH(inp, head, inp_hash) {
1400 #ifdef INET6
1401                 if (!(inp->inp_vflag & INP_IPV4))
1402                         continue;
1403 #endif
1404                 if (in_hosteq(inp->inp_faddr, faddr) &&
1405                     in_hosteq(inp->inp_laddr, laddr) &&
1406                     inp->inp_fport == fport && inp->inp_lport == lport) {
1407                         /* found */
1408                         if (inp->inp_socket == NULL ||
1409                             inp->inp_socket->so_cred->cr_prison == NULL) {
1410                                 return (inp);
1411                         } else {
1412                                 if  (jinp == NULL)
1413                                         jinp = inp;
1414                         }
1415                 }
1416         }
1417         if (jinp != NULL)
1418                 return (jinp);
1419         if (wildcard) {
1420                 struct inpcb *local_wild = NULL;
1421                 struct inpcb *jinp_wild = NULL;
1422 #ifdef INET6
1423                 struct inpcb *local_wild_mapped = NULL;
1424 #endif
1425                 struct inpcontainer *ic;
1426                 struct inpcontainerhead *chead;
1427                 struct sockaddr_in jsin;
1428                 struct ucred *cred;
1429
1430                 /*
1431                  * Check local group first
1432                  */
1433                 if (pcbinfo->localgrphashbase != NULL &&
1434                     m != NULL && (m->m_flags & M_HASH) &&
1435                     !(ifp && ifp->if_type == IFT_FAITH)) {
1436                         inp = inp_localgroup_lookup(pcbinfo,
1437                             laddr, lport, m->m_pkthdr.hash);
1438                         if (inp != NULL)
1439                                 return inp;
1440                 }
1441
1442                 /*
1443                  * Order of socket selection:
1444                  * 1. non-jailed, non-wild.
1445                  * 2. non-jailed, wild.
1446                  * 3. jailed, non-wild.
1447                  * 4. jailed, wild.
1448                  */
1449                 jsin.sin_family = AF_INET;
1450                 chead = &pcbinfo->wildcardhashbase[
1451                     INP_PCBWILDCARDHASH(lport, pcbinfo->wildcardhashmask)];
1452                 LIST_FOREACH(ic, chead, ic_list) {
1453                         inp = ic->ic_inp;
1454                         jsin.sin_addr.s_addr = laddr.s_addr;
1455 #ifdef INET6
1456                         if (!(inp->inp_vflag & INP_IPV4))
1457                                 continue;
1458 #endif
1459                         if (inp->inp_socket != NULL)
1460                                 cred = inp->inp_socket->so_cred;
1461                         else
1462                                 cred = NULL;
1463                         if (cred != NULL && jailed(cred)) {
1464                                 if (jinp != NULL)
1465                                         continue;
1466                                 else
1467                                         if (!jailed_ip(cred->cr_prison,
1468                                             (struct sockaddr *)&jsin))
1469                                                 continue;
1470                         }
1471                         if (inp->inp_lport == lport) {
1472                                 if (ifp && ifp->if_type == IFT_FAITH &&
1473                                     !(inp->inp_flags & INP_FAITH))
1474                                         continue;
1475                                 if (inp->inp_laddr.s_addr == laddr.s_addr) {
1476                                         if (cred != NULL && jailed(cred))
1477                                                 jinp = inp;
1478                                         else
1479                                                 return (inp);
1480                                 }
1481                                 if (inp->inp_laddr.s_addr == INADDR_ANY) {
1482 #ifdef INET6
1483                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
1484                                                              AF_INET6))
1485                                                 local_wild_mapped = inp;
1486                                         else
1487 #endif
1488                                                 if (cred != NULL &&
1489                                                     jailed(cred))
1490                                                         jinp_wild = inp;
1491                                                 else
1492                                                         local_wild = inp;
1493                                 }
1494                         }
1495                 }
1496                 if (local_wild != NULL)
1497                         return (local_wild);
1498 #ifdef INET6
1499                 if (local_wild_mapped != NULL)
1500                         return (local_wild_mapped);
1501 #endif
1502                 if (jinp != NULL)
1503                         return (jinp);
1504                 return (jinp_wild);
1505         }
1506
1507         /*
1508          * Not found.
1509          */
1510         return (NULL);
1511 }
1512
1513 struct inpcb *
1514 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1515     u_int fport_arg, struct in_addr laddr, u_int lport_arg,
1516     boolean_t wildcard, struct ifnet *ifp)
1517 {
1518         return in_pcblookup_pkthash(pcbinfo, faddr, fport_arg,
1519             laddr, lport_arg, wildcard, ifp, NULL);
1520 }
1521
1522 /*
1523  * Insert PCB into connection hash table.
1524  */
1525 void
1526 in_pcbinsconnhash(struct inpcb *inp)
1527 {
1528         struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo;
1529         struct inpcbhead *bucket;
1530         u_int32_t hashkey_faddr, hashkey_laddr;
1531
1532 #ifdef INET6
1533         if (inp->inp_vflag & INP_IPV6) {
1534                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */;
1535                 hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */;
1536         } else {
1537 #endif
1538                 hashkey_faddr = inp->inp_faddr.s_addr;
1539                 hashkey_laddr = inp->inp_laddr.s_addr;
1540 #ifdef INET6
1541         }
1542 #endif
1543
1544         KASSERT(!(inp->inp_flags & INP_WILDCARD),
1545                 ("already on wildcardhash"));
1546         KASSERT(!(inp->inp_flags & INP_CONNECTED),
1547                 ("already on connhash"));
1548         inp->inp_flags |= INP_CONNECTED;
1549
1550         /*
1551          * Insert into the connection hash table.
1552          */
1553         bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr,
1554             inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)];
1555         LIST_INSERT_HEAD(bucket, inp, inp_hash);
1556 }
1557
1558 /*
1559  * Remove PCB from connection hash table.
1560  */
1561 void
1562 in_pcbremconnhash(struct inpcb *inp)
1563 {
1564         KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected"));
1565         LIST_REMOVE(inp, inp_hash);
1566         inp->inp_flags &= ~INP_CONNECTED;
1567 }
1568
1569 /*
1570  * Insert PCB into port hash table.
1571  */
1572 void
1573 in_pcbinsporthash(struct inpcbportinfo *portinfo, struct inpcb *inp)
1574 {
1575         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1576         struct inpcbporthead *pcbporthash;
1577         struct inpcbport *phd;
1578
1579         /*
1580          * If the porthashbase is shared across several cpus, it must
1581          * have been locked.
1582          */
1583         ASSERT_PORT_TOKEN_HELD(portinfo);
1584
1585         /*
1586          * Insert into the port hash table.
1587          */
1588         pcbporthash = &portinfo->porthashbase[
1589             INP_PCBPORTHASH(inp->inp_lport, portinfo->porthashmask)];
1590
1591         /* Go through port list and look for a head for this lport. */
1592         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1593                 if (phd->phd_port == inp->inp_lport)
1594                         break;
1595         }
1596
1597         /* If none exists, use saved one and tack it on. */
1598         if (phd == NULL) {
1599                 KKASSERT(pcbinfo->portsave != NULL);
1600                 phd = pcbinfo->portsave;
1601                 pcbinfo->portsave = NULL;
1602                 phd->phd_port = inp->inp_lport;
1603                 LIST_INIT(&phd->phd_pcblist);
1604                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1605         }
1606
1607         inp->inp_portinfo = portinfo;
1608         inp->inp_phd = phd;
1609         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1610
1611         /*
1612          * Malloc one inpcbport for later use.  It is safe to use
1613          * "wait" malloc here (port token would be released, if
1614          * malloc ever blocked), since all changes to the porthash
1615          * are done.
1616          */
1617         if (pcbinfo->portsave == NULL) {
1618                 pcbinfo->portsave = kmalloc(sizeof(*pcbinfo->portsave),
1619                                             M_PCB, M_INTWAIT | M_ZERO);
1620         }
1621 }
1622
1623 void
1624 in_pcbinsporthash_lport(struct inpcb *inp)
1625 {
1626         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1627         struct inpcbportinfo *portinfo;
1628         u_short lport_ho;
1629
1630         /* Locate the proper portinfo based on lport */
1631         lport_ho = ntohs(inp->inp_lport);
1632         portinfo = &pcbinfo->portinfo[lport_ho & pcbinfo->portinfo_mask];
1633         KKASSERT((lport_ho & pcbinfo->portinfo_mask) == portinfo->offset);
1634
1635         GET_PORT_TOKEN(portinfo);
1636         in_pcbinsporthash(portinfo, inp);
1637         REL_PORT_TOKEN(portinfo);
1638 }
1639
1640 static struct inp_localgroup *
1641 inp_localgroup_alloc(struct inp_localgrphead *hdr, u_char vflag,
1642     uint16_t port, const union in_dependaddr *addr, int size)
1643 {
1644         struct inp_localgroup *grp;
1645
1646         grp = kmalloc(__offsetof(struct inp_localgroup, il_inp[size]),
1647             M_TEMP, M_INTWAIT | M_ZERO);
1648         grp->il_vflag = vflag;
1649         grp->il_lport = port;
1650         grp->il_dependladdr = *addr;
1651         grp->il_inpsiz = size;
1652
1653         LIST_INSERT_HEAD(hdr, grp, il_list);
1654
1655         return grp;
1656 }
1657
1658 static void
1659 inp_localgroup_free(struct inp_localgroup *grp)
1660 {
1661         LIST_REMOVE(grp, il_list);
1662         kfree(grp, M_TEMP);
1663 }
1664
1665 static struct inp_localgroup *
1666 inp_localgroup_resize(struct inp_localgrphead *hdr,
1667     struct inp_localgroup *old_grp, int size)
1668 {
1669         struct inp_localgroup *grp;
1670         int i;
1671
1672         grp = inp_localgroup_alloc(hdr, old_grp->il_vflag,
1673             old_grp->il_lport, &old_grp->il_dependladdr, size);
1674
1675         KASSERT(old_grp->il_inpcnt < grp->il_inpsiz,
1676             ("invalid new local group size %d and old local group count %d",
1677              grp->il_inpsiz, old_grp->il_inpcnt));
1678         for (i = 0; i < old_grp->il_inpcnt; ++i)
1679                 grp->il_inp[i] = old_grp->il_inp[i];
1680         grp->il_inpcnt = old_grp->il_inpcnt;
1681         grp->il_factor = old_grp->il_factor;
1682
1683         inp_localgroup_free(old_grp);
1684
1685         return grp;
1686 }
1687
1688 static void
1689 inp_localgroup_factor(struct inp_localgroup *grp)
1690 {
1691         grp->il_factor =
1692             ((uint32_t)(0xffff >> ncpus2_shift) / grp->il_inpcnt) + 1;
1693         KASSERT(grp->il_factor != 0, ("invalid local group factor, "
1694             "ncpus2_shift %d, inpcnt %d", ncpus2_shift, grp->il_inpcnt));
1695 }
1696
1697 static void
1698 in_pcbinslocalgrphash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1699 {
1700         struct inp_localgrphead *hdr;
1701         struct inp_localgroup *grp;
1702         struct ucred *cred;
1703
1704         if (pcbinfo->localgrphashbase == NULL)
1705                 return;
1706
1707         /*
1708          * XXX don't allow jailed socket to join local group
1709          */
1710         if (inp->inp_socket != NULL)
1711                 cred = inp->inp_socket->so_cred;
1712         else
1713                 cred = NULL;
1714         if (cred != NULL && jailed(cred))
1715                 return;
1716
1717 #ifdef INET6
1718         /*
1719          * XXX don't allow IPv4 mapped INET6 wild socket
1720          */
1721         if ((inp->inp_vflag & INP_IPV4) &&
1722             inp->inp_laddr.s_addr == INADDR_ANY &&
1723             INP_CHECK_SOCKAF(inp->inp_socket, AF_INET6))
1724                 return;
1725 #endif
1726
1727         hdr = &pcbinfo->localgrphashbase[
1728             INP_PCBLOCALGRPHASH(inp->inp_lport, pcbinfo->localgrphashmask)];
1729
1730         LIST_FOREACH(grp, hdr, il_list) {
1731                 if (grp->il_vflag == inp->inp_vflag &&
1732                     grp->il_lport == inp->inp_lport &&
1733                     memcmp(&grp->il_dependladdr,
1734                         &inp->inp_inc.inc_ie.ie_dependladdr,
1735                         sizeof(grp->il_dependladdr)) == 0) {
1736                         break;
1737                 }
1738         }
1739         if (grp == NULL) {
1740                 /* Create new local group */
1741                 grp = inp_localgroup_alloc(hdr, inp->inp_vflag,
1742                     inp->inp_lport, &inp->inp_inc.inc_ie.ie_dependladdr,
1743                     INP_LOCALGROUP_SIZMIN);
1744         } else if (grp->il_inpcnt == grp->il_inpsiz) {
1745                 if (grp->il_inpsiz >= INP_LOCALGROUP_SIZMAX) {
1746                         static int limit_logged = 0;
1747
1748                         if (!limit_logged) {
1749                                 limit_logged = 1;
1750                                 kprintf("local group port %d, "
1751                                     "limit reached\n", ntohs(grp->il_lport));
1752                         }
1753                         return;
1754                 }
1755
1756                 /* Expand this local group */
1757                 grp = inp_localgroup_resize(hdr, grp, grp->il_inpsiz * 2);
1758         }
1759
1760         KASSERT(grp->il_inpcnt < grp->il_inpsiz,
1761             ("invalid local group size %d and count %d",
1762              grp->il_inpsiz, grp->il_inpcnt));
1763         grp->il_inp[grp->il_inpcnt] = inp;
1764         grp->il_inpcnt++;
1765         inp_localgroup_factor(grp);
1766 }
1767
1768 void
1769 in_pcbinswildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1770 {
1771         struct inpcontainer *ic;
1772         struct inpcontainerhead *bucket;
1773
1774         in_pcbinslocalgrphash_oncpu(inp, pcbinfo);
1775
1776         bucket = &pcbinfo->wildcardhashbase[
1777             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1778
1779         ic = kmalloc(sizeof(struct inpcontainer), M_TEMP, M_INTWAIT);
1780         ic->ic_inp = inp;
1781         LIST_INSERT_HEAD(bucket, ic, ic_list);
1782 }
1783
1784 /*
1785  * Insert PCB into wildcard hash table.
1786  */
1787 void
1788 in_pcbinswildcardhash(struct inpcb *inp)
1789 {
1790         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1791
1792         KASSERT(!(inp->inp_flags & INP_CONNECTED),
1793                 ("already on connhash"));
1794         KASSERT(!(inp->inp_flags & INP_WILDCARD),
1795                 ("already on wildcardhash"));
1796         inp->inp_flags |= INP_WILDCARD;
1797
1798         in_pcbinswildcardhash_oncpu(inp, pcbinfo);
1799 }
1800
1801 static void
1802 in_pcbremlocalgrphash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1803 {
1804         struct inp_localgrphead *hdr;
1805         struct inp_localgroup *grp;
1806
1807         if (pcbinfo->localgrphashbase == NULL)
1808                 return;
1809
1810         hdr = &pcbinfo->localgrphashbase[
1811             INP_PCBLOCALGRPHASH(inp->inp_lport, pcbinfo->localgrphashmask)];
1812
1813         LIST_FOREACH(grp, hdr, il_list) {
1814                 int i;
1815
1816                 for (i = 0; i < grp->il_inpcnt; ++i) {
1817                         if (grp->il_inp[i] != inp)
1818                                 continue;
1819
1820                         if (grp->il_inpcnt == 1) {
1821                                 /* Free this local group */
1822                                 inp_localgroup_free(grp);
1823                         } else {
1824                                 /* Pull up inpcbs */
1825                                 for (; i + 1 < grp->il_inpcnt; ++i)
1826                                         grp->il_inp[i] = grp->il_inp[i + 1];
1827                                 grp->il_inpcnt--;
1828                                 inp_localgroup_factor(grp);
1829
1830                                 if (grp->il_inpsiz > INP_LOCALGROUP_SIZMIN &&
1831                                     grp->il_inpcnt <= (grp->il_inpsiz / 4)) {
1832                                         /* Shrink this local group */
1833                                         grp = inp_localgroup_resize(hdr, grp,
1834                                             grp->il_inpsiz / 2);
1835                                 }
1836                         }
1837                         return;
1838                 }
1839         }
1840 }
1841
1842 void
1843 in_pcbremwildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
1844 {
1845         struct inpcontainer *ic;
1846         struct inpcontainerhead *head;
1847
1848         in_pcbremlocalgrphash_oncpu(inp, pcbinfo);
1849
1850         /* find bucket */
1851         head = &pcbinfo->wildcardhashbase[
1852             INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];
1853
1854         LIST_FOREACH(ic, head, ic_list) {
1855                 if (ic->ic_inp == inp)
1856                         goto found;
1857         }
1858         return;                 /* not found! */
1859
1860 found:
1861         LIST_REMOVE(ic, ic_list);       /* remove container from bucket chain */
1862         kfree(ic, M_TEMP);              /* deallocate container */
1863 }
1864
1865 /*
1866  * Remove PCB from wildcard hash table.
1867  */
1868 void
1869 in_pcbremwildcardhash(struct inpcb *inp)
1870 {
1871         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1872
1873         KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard"));
1874         in_pcbremwildcardhash_oncpu(inp, pcbinfo);
1875         inp->inp_flags &= ~INP_WILDCARD;
1876 }
1877
1878 /*
1879  * Remove PCB from various lists.
1880  */
1881 void
1882 in_pcbremlists(struct inpcb *inp)
1883 {
1884         if (inp->inp_lport) {
1885                 struct inpcbportinfo *portinfo;
1886                 struct inpcbport *phd;
1887
1888                 /*
1889                  * NOTE:
1890                  * inp->inp_portinfo is _not_ necessary same as
1891                  * inp->inp_pcbinfo->portinfo.
1892                  */
1893                 portinfo = inp->inp_portinfo;
1894                 GET_PORT_TOKEN(portinfo);
1895
1896                 phd = inp->inp_phd;
1897                 LIST_REMOVE(inp, inp_portlist);
1898                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1899                         LIST_REMOVE(phd, phd_hash);
1900                         kfree(phd, M_PCB);
1901                 }
1902
1903                 REL_PORT_TOKEN(portinfo);
1904         }
1905         if (inp->inp_flags & INP_WILDCARD) {
1906                 in_pcbremwildcardhash(inp);
1907         } else if (inp->inp_flags & INP_CONNECTED) {
1908                 in_pcbremconnhash(inp);
1909         }
1910         LIST_REMOVE(inp, inp_list);
1911         inp->inp_pcbinfo->ipi_count--;
1912 }
1913
1914 int
1915 prison_xinpcb(struct thread *td, struct inpcb *inp)
1916 {
1917         struct ucred *cr;
1918
1919         if (td->td_proc == NULL)
1920                 return (0);
1921         cr = td->td_proc->p_ucred;
1922         if (cr->cr_prison == NULL)
1923                 return (0);
1924         if (inp->inp_socket && inp->inp_socket->so_cred &&
1925             inp->inp_socket->so_cred->cr_prison &&
1926             cr->cr_prison == inp->inp_socket->so_cred->cr_prison)
1927                 return (0);
1928         return (1);
1929 }
1930
1931 int
1932 in_pcblist_global(SYSCTL_HANDLER_ARGS)
1933 {
1934         struct inpcbinfo *pcbinfo = arg1;
1935         struct inpcb *inp, *marker;
1936         struct xinpcb xi;
1937         int error, i, n;
1938
1939         /*
1940          * The process of preparing the TCB list is too time-consuming and
1941          * resource-intensive to repeat twice on every request.
1942          */
1943         if (req->oldptr == NULL) {
1944                 n = pcbinfo->ipi_count;
1945                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
1946                 return 0;
1947         }
1948
1949         if (req->newptr != NULL)
1950                 return EPERM;
1951
1952         /*
1953          * OK, now we're committed to doing something.  Re-fetch ipi_count
1954          * after obtaining the generation count.
1955          */
1956         n = pcbinfo->ipi_count;
1957
1958         marker = kmalloc(sizeof(struct inpcb), M_TEMP, M_WAITOK|M_ZERO);
1959         marker->inp_flags |= INP_PLACEMARKER;
1960         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
1961
1962         i = 0;
1963         error = 0;
1964
1965         while ((inp = LIST_NEXT(marker, inp_list)) != NULL && i < n) {
1966                 LIST_REMOVE(marker, inp_list);
1967                 LIST_INSERT_AFTER(inp, marker, inp_list);
1968
1969                 if (inp->inp_flags & INP_PLACEMARKER)
1970                         continue;
1971                 if (prison_xinpcb(req->td, inp))
1972                         continue;
1973                 bzero(&xi, sizeof xi);
1974                 xi.xi_len = sizeof xi;
1975                 bcopy(inp, &xi.xi_inp, sizeof *inp);
1976                 if (inp->inp_socket)
1977                         sotoxsocket(inp->inp_socket, &xi.xi_socket);
1978                 if ((error = SYSCTL_OUT(req, &xi, sizeof xi)) != 0)
1979                         break;
1980                 ++i;
1981         }
1982         LIST_REMOVE(marker, inp_list);
1983         if (error == 0 && i < n) {
1984                 bzero(&xi, sizeof xi);
1985                 xi.xi_len = sizeof xi;
1986                 while (i < n) {
1987                         error = SYSCTL_OUT(req, &xi, sizeof xi);
1988                         ++i;
1989                 }
1990         }
1991         kfree(marker, M_TEMP);
1992         return(error);
1993 }
1994
1995 int
1996 in_pcblist_global_nomarker(SYSCTL_HANDLER_ARGS, struct xinpcb **xi0, int *nxi0)
1997 {
1998         struct inpcbinfo *pcbinfo = arg1;
1999         struct inpcb *inp;
2000         struct xinpcb *xi;
2001         int nxi;
2002
2003         *nxi0 = 0;
2004         *xi0 = NULL;
2005
2006         /*
2007          * The process of preparing the PCB list is too time-consuming and
2008          * resource-intensive to repeat twice on every request.
2009          */
2010         if (req->oldptr == NULL) {
2011                 int n = pcbinfo->ipi_count;
2012
2013                 req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
2014                 return 0;
2015         }
2016
2017         if (req->newptr != NULL)
2018                 return EPERM;
2019
2020         if (pcbinfo->ipi_count == 0)
2021                 return 0;
2022
2023         nxi = 0;
2024         xi = kmalloc(pcbinfo->ipi_count * sizeof(*xi), M_TEMP,
2025                      M_WAITOK | M_ZERO | M_NULLOK);
2026         if (xi == NULL)
2027                 return ENOMEM;
2028
2029         LIST_FOREACH(inp, &pcbinfo->pcblisthead, inp_list) {
2030                 struct xinpcb *xi_ptr = &xi[nxi];
2031
2032                 if (prison_xinpcb(req->td, inp))
2033                         continue;
2034
2035                 xi_ptr->xi_len = sizeof(*xi_ptr);
2036                 bcopy(inp, &xi_ptr->xi_inp, sizeof(*inp));
2037                 if (inp->inp_socket)
2038                         sotoxsocket(inp->inp_socket, &xi_ptr->xi_socket);
2039                 ++nxi;
2040         }
2041
2042         if (nxi == 0) {
2043                 kfree(xi, M_TEMP);
2044                 return 0;
2045         }
2046
2047         *nxi0 = nxi;
2048         *xi0 = xi;
2049
2050         return 0;
2051 }
2052
2053 void
2054 in_savefaddr(struct socket *so, const struct sockaddr *faddr)
2055 {
2056         struct sockaddr_in *sin;
2057
2058         KASSERT(faddr->sa_family == AF_INET,
2059             ("not AF_INET faddr %d", faddr->sa_family));
2060
2061         sin = kmalloc(sizeof(*sin), M_SONAME, M_WAITOK | M_ZERO);
2062         sin->sin_family = AF_INET;
2063         sin->sin_len = sizeof(*sin);
2064         sin->sin_port = ((const struct sockaddr_in *)faddr)->sin_port;
2065         sin->sin_addr = ((const struct sockaddr_in *)faddr)->sin_addr;
2066
2067         so->so_faddr = (struct sockaddr *)sin;
2068 }
2069
2070 void
2071 in_pcbportinfo_init(struct inpcbportinfo *portinfo, int hashsize,
2072     boolean_t shared, u_short offset)
2073 {
2074         memset(portinfo, 0, sizeof(*portinfo));
2075
2076         portinfo->offset = offset;
2077         portinfo->lastport = offset;
2078         portinfo->lastlow = offset;
2079         portinfo->lasthi = offset;
2080
2081         portinfo->porthashbase = hashinit(hashsize, M_PCB,
2082             &portinfo->porthashmask);
2083
2084         if (shared) {
2085                 portinfo->porttoken = kmalloc(sizeof(struct lwkt_token),
2086                     M_PCB, M_WAITOK);
2087                 lwkt_token_init(portinfo->porttoken, "porttoken");
2088         }
2089 }
2090
2091 void
2092 in_pcbportrange(u_short *hi0, u_short *lo0, u_short ofs, u_short step)
2093 {
2094         int hi, lo;
2095
2096         if (step == 1)
2097                 return;
2098
2099         hi = *hi0;
2100         lo = *lo0;
2101
2102         hi = rounddown2(hi, step);
2103         hi += ofs;
2104         if (hi > (int)*hi0)
2105                 hi -= step;
2106
2107         lo = roundup2(lo, step);
2108         lo -= (step - ofs);
2109         if (lo < (int)*lo0)
2110                 lo += step;
2111
2112         *hi0 = hi;
2113         *lo0 = lo;
2114 }