sys/netinet/in_pcb.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1991, 1993, 1995
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
  30  * $FreeBSD$
  31  */
  32
  33 #include "opt_ipsec.h"
  34 #include "opt_inet6.h"
  35 #include "opt_mac.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mac.h>
  40 #include <sys/malloc.h>
  41 #include <sys/mbuf.h>
  42 #include <sys/domain.h>
  43 #include <sys/protosw.h>
  44 #include <sys/socket.h>
  45 #include <sys/socketvar.h>
  46 #include <sys/proc.h>
  47 #include <sys/jail.h>
  48 #include <sys/kernel.h>
  49 #include <sys/sysctl.h>
  50
  51 #include <vm/uma.h>
  52
  53 #include <net/if.h>
  54 #include <net/if_types.h>
  55 #include <net/route.h>
  56
  57 #include <netinet/in.h>
  58 #include <netinet/in_pcb.h>
  59 #include <netinet/in_var.h>
  60 #include <netinet/ip_var.h>
  61 #include <netinet/tcp_var.h>
  62 #include <netinet/udp.h>
  63 #include <netinet/udp_var.h>
  64 #ifdef INET6
  65 #include <netinet/ip6.h>
  66 #include <netinet6/ip6_var.h>
  67 #endif /* INET6 */
  68
  69 #ifdef IPSEC
  70 #include <netinet6/ipsec.h>
  71 #include <netkey/key.h>
  72 #endif /* IPSEC */
  73
  74 #ifdef FAST_IPSEC
  75 #if defined(IPSEC) || defined(IPSEC_ESP)
  76 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
  77 #endif
  78
  79 #include <netipsec/ipsec.h>
  80 #include <netipsec/key.h>
  81 #endif /* FAST_IPSEC */
  82
  83 /*
  84  * These configure the range of local port addresses assigned to
  85  * "unspecified" outgoing connections/packets/whatever.
  86  */
  87 int     ipport_lowfirstauto  = IPPORT_RESERVED - 1;     /* 1023 */
  88 int     ipport_lowlastauto = IPPORT_RESERVEDSTART;      /* 600 */
  89 int     ipport_firstauto = IPPORT_HIFIRSTAUTO;          /* 49152 */
  90 int     ipport_lastauto  = IPPORT_HILASTAUTO;           /* 65535 */
  91 int     ipport_hifirstauto = IPPORT_HIFIRSTAUTO;        /* 49152 */
  92 int     ipport_hilastauto  = IPPORT_HILASTAUTO;         /* 65535 */
  93
  94 /*
  95  * Reserved ports accessible only to root. There are significant
  96  * security considerations that must be accounted for when changing these,
  97  * but the security benefits can be great. Please be careful.
  98  */
  99 int     ipport_reservedhigh = IPPORT_RESERVED - 1;      /* 1023 */
 100 int     ipport_reservedlow = 0;
 101
 102 /* Variables dealing with random ephemeral port allocation. */
 103 int     ipport_randomized = 1;  /* user controlled via sysctl */
 104 int     ipport_randomcps = 10;  /* user controlled via sysctl */
 105 int     ipport_randomtime = 45; /* user controlled via sysctl */
 106 int     ipport_stoprandom = 0;  /* toggled by ipport_tick */
 107 int     ipport_tcpallocs;
 108 int     ipport_tcplastcount;
 109
 110 #define RANGECHK(var, min, max) \
 111         if ((var) < (min)) { (var) = (min); } \
 112         else if ((var) > (max)) { (var) = (max); }
 113
 114 static int
 115 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 116 {
 117         int error;
 118
 119         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 120         if (error == 0) {
 121                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 122                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 123                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
 124                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
 125                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
 126                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
 127         }
 128         return (error);
 129 }
 130
 131 #undef RANGECHK
 132
 133 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 134
 135 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
 136            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
 137 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
 138            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
 139 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
 140            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
 141 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
 142            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
 143 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
 144            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
 145 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
 146            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
 147 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
 148            CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedhigh, 0, "");
 149 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
 150            CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedlow, 0, "");
 151 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
 152            &ipport_randomized, 0, "Enable random port allocation");
 153 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
 154            &ipport_randomcps, 0, "Maximum number of random port "
 155            "allocations before switching to a sequental one");
 156 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
 157            &ipport_randomtime, 0, "Minimum time to keep sequental port "
 158            "allocation before switching to a random one");
 159
 160 /*
 161  * in_pcb.c: manage the Protocol Control Blocks.
 162  *
 163  * NOTE: It is assumed that most of these functions will be called with
 164  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
 165  * functions often modify hash chains or addresses in pcbs.
 166  */
 167
 168 /*
 169  * Allocate a PCB and associate it with the socket.
 170  */
 171 int
 172 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo, const char *type)
 173 {
 174         struct inpcb *inp;
 175         int error;
 176
 177         INP_INFO_WLOCK_ASSERT(pcbinfo);
 178         error = 0;
 179         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT | M_ZERO);
 180         if (inp == NULL)
 181                 return (ENOBUFS);
 182         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 183         inp->inp_pcbinfo = pcbinfo;
 184         inp->inp_socket = so;
 185 #ifdef MAC
 186         error = mac_init_inpcb(inp, M_NOWAIT);
 187         if (error != 0)
 188                 goto out;
 189         SOCK_LOCK(so);
 190         mac_create_inpcb_from_socket(so, inp);
 191         SOCK_UNLOCK(so);
 192 #endif
 193 #if defined(IPSEC) || defined(FAST_IPSEC)
 194 #ifdef FAST_IPSEC
 195         error = ipsec_init_policy(so, &inp->inp_sp);
 196 #else
 197         error = ipsec_init_pcbpolicy(so, &inp->inp_sp);
 198 #endif
 199         if (error != 0)
 200                 goto out;
 201 #endif /*IPSEC*/
 202 #if defined(INET6)
 203         if (INP_SOCKAF(so) == AF_INET6) {
 204                 inp->inp_vflag |= INP_IPV6PROTO;
 205                 if (ip6_v6only)
 206                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 207         }
 208 #endif
 209         LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
 210         pcbinfo->ipi_count++;
 211         so->so_pcb = (caddr_t)inp;
 212         INP_LOCK_INIT(inp, "inp", type);
 213 #ifdef INET6
 214         if (ip6_auto_flowlabel)
 215                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 216 #endif
 217 #if defined(IPSEC) || defined(FAST_IPSEC) || defined(MAC)
 218 out:
 219         if (error != 0)
 220                 uma_zfree(pcbinfo->ipi_zone, inp);
 221 #endif
 222         return (error);
 223 }
 224
 225 int
 226 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 227 {
 228         int anonport, error;
 229
 230         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 231         INP_LOCK_ASSERT(inp);
 232
 233         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 234                 return (EINVAL);
 235         anonport = inp->inp_lport == 0 && (nam == NULL ||
 236             ((struct sockaddr_in *)nam)->sin_port == 0);
 237         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 238             &inp->inp_lport, cred);
 239         if (error)
 240                 return (error);
 241         if (in_pcbinshash(inp) != 0) {
 242                 inp->inp_laddr.s_addr = INADDR_ANY;
 243                 inp->inp_lport = 0;
 244                 return (EAGAIN);
 245         }
 246         if (anonport)
 247                 inp->inp_flags |= INP_ANONPORT;
 248         return (0);
 249 }
 250
 251 /*
 252  * Set up a bind operation on a PCB, performing port allocation
 253  * as required, but do not actually modify the PCB. Callers can
 254  * either complete the bind by setting inp_laddr/inp_lport and
 255  * calling in_pcbinshash(), or they can just use the resulting
 256  * port and address to authorise the sending of a once-off packet.
 257  *
 258  * On error, the values of *laddrp and *lportp are not changed.
 259  */
 260 int
 261 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 262     u_short *lportp, struct ucred *cred)
 263 {
 264         struct socket *so = inp->inp_socket;
 265         unsigned short *lastport;
 266         struct sockaddr_in *sin;
 267         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 268         struct in_addr laddr;
 269         u_short lport = 0;
 270         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 271         int error, prison = 0;
 272         int dorandom;
 273
 274         INP_INFO_WLOCK_ASSERT(pcbinfo);
 275         INP_LOCK_ASSERT(inp);
 276
 277         if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
 278                 return (EADDRNOTAVAIL);
 279         laddr.s_addr = *laddrp;
 280         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 281                 return (EINVAL);
 282         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 283                 wild = 1;
 284         if (nam) {
 285                 sin = (struct sockaddr_in *)nam;
 286                 if (nam->sa_len != sizeof (*sin))
 287                         return (EINVAL);
 288 #ifdef notdef
 289                 /*
 290                  * We should check the family, but old programs
 291                  * incorrectly fail to initialize it.
 292                  */
 293                 if (sin->sin_family != AF_INET)
 294                         return (EAFNOSUPPORT);
 295 #endif
 296                 if (sin->sin_addr.s_addr != INADDR_ANY)
 297                         if (prison_ip(cred, 0, &sin->sin_addr.s_addr))
 298                                 return(EINVAL);
 299                 if (sin->sin_port != *lportp) {
 300                         /* Don't allow the port to change. */
 301                         if (*lportp != 0)
 302                                 return (EINVAL);
 303                         lport = sin->sin_port;
 304                 }
 305                 /* NB: lport is left as 0 if the port isn't being changed. */
 306                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 307                         /*
 308                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 309                          * allow complete duplication of binding if
 310                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 311                          * and a multicast address is bound on both
 312                          * new and duplicated sockets.
 313                          */
 314                         if (so->so_options & SO_REUSEADDR)
 315                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 316                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 317                         sin->sin_port = 0;              /* yech... */
 318                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 319                         if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
 320                                 return (EADDRNOTAVAIL);
 321                 }
 322                 laddr = sin->sin_addr;
 323                 if (lport) {
 324                         struct inpcb *t;
 325                         /* GROSS */
 326                         if (ntohs(lport) <= ipport_reservedhigh &&
 327                             ntohs(lport) >= ipport_reservedlow &&
 328                             suser_cred(cred, SUSER_ALLOWJAIL))
 329                                 return (EACCES);
 330                         if (jailed(cred))
 331                                 prison = 1;
 332                         if (so->so_cred->cr_uid != 0 &&
 333                             !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 334                                 t = in_pcblookup_local(inp->inp_pcbinfo,
 335                                     sin->sin_addr, lport,
 336                                     prison ? 0 :  INPLOOKUP_WILDCARD);
 337         /*
 338          * XXX
 339          * This entire block sorely needs a rewrite.
 340          */
 341                                 if (t &&
 342                                     ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
 343                                     (so->so_type != SOCK_STREAM ||
 344                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
 345                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
 346                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 347                                      (t->inp_socket->so_options &
 348                                          SO_REUSEPORT) == 0) &&
 349                                     (so->so_cred->cr_uid !=
 350                                      t->inp_socket->so_cred->cr_uid))
 351                                         return (EADDRINUSE);
 352                         }
 353                         if (prison && prison_ip(cred, 0, &sin->sin_addr.s_addr))
 354                                 return (EADDRNOTAVAIL);
 355                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 356                             lport, prison ? 0 : wild);
 357                         if (t && (t->inp_vflag & INP_TIMEWAIT)) {
 358                                 if ((reuseport & intotw(t)->tw_so_options) == 0)
 359                                         return (EADDRINUSE);
 360                         } else
 361                         if (t &&
 362                             (reuseport & t->inp_socket->so_options) == 0) {
 363 #if defined(INET6)
 364                                 if (ntohl(sin->sin_addr.s_addr) !=
 365                                     INADDR_ANY ||
 366                                     ntohl(t->inp_laddr.s_addr) !=
 367                                     INADDR_ANY ||
 368                                     INP_SOCKAF(so) ==
 369                                     INP_SOCKAF(t->inp_socket))
 370 #endif /* defined(INET6) */
 371                                 return (EADDRINUSE);
 372                         }
 373                 }
 374         }
 375         if (*lportp != 0)
 376                 lport = *lportp;
 377         if (lport == 0) {
 378                 u_short first, last;
 379                 int count;
 380
 381                 if (laddr.s_addr != INADDR_ANY)
 382                         if (prison_ip(cred, 0, &laddr.s_addr))
 383                                 return (EINVAL);
 384
 385                 if (inp->inp_flags & INP_HIGHPORT) {
 386                         first = ipport_hifirstauto;     /* sysctl */
 387                         last  = ipport_hilastauto;
 388                         lastport = &pcbinfo->lasthi;
 389                 } else if (inp->inp_flags & INP_LOWPORT) {
 390                         if ((error = suser_cred(cred, SUSER_ALLOWJAIL)) != 0)
 391                                 return error;
 392                         first = ipport_lowfirstauto;    /* 1023 */
 393                         last  = ipport_lowlastauto;     /* 600 */
 394                         lastport = &pcbinfo->lastlow;
 395                 } else {
 396                         first = ipport_firstauto;       /* sysctl */
 397                         last  = ipport_lastauto;
 398                         lastport = &pcbinfo->lastport;
 399                 }
 400                 /*
 401                  * For UDP, use random port allocation as long as the user
 402                  * allows it.  For TCP (and as of yet unknown) connections,
 403                  * use random port allocation only if the user allows it AND
 404                  * ipport_tick() allows it.
 405                  */
 406                 if (ipport_randomized &&
 407                         (!ipport_stoprandom || pcbinfo == &udbinfo))
 408                         dorandom = 1;
 409                 else
 410                         dorandom = 0;
 411                 /*
 412                  * It makes no sense to do random port allocation if
 413                  * we have the only port available.
 414                  */
 415                 if (first == last)
 416                         dorandom = 0;
 417                 /* Make sure to not include UDP packets in the count. */
 418                 if (pcbinfo != &udbinfo)
 419                         ipport_tcpallocs++;
 420                 /*
 421                  * Simple check to ensure all ports are not used up causing
 422                  * a deadlock here.
 423                  *
 424                  * We split the two cases (up and down) so that the direction
 425                  * is not being tested on each round of the loop.
 426                  */
 427                 if (first > last) {
 428                         /*
 429                          * counting down
 430                          */
 431                         if (dorandom)
 432                                 *lastport = first -
 433                                             (arc4random() % (first - last));
 434                         count = first - last;
 435
 436                         do {
 437                                 if (count-- < 0)        /* completely used? */
 438                                         return (EADDRNOTAVAIL);
 439                                 --*lastport;
 440                                 if (*lastport > first || *lastport < last)
 441                                         *lastport = first;
 442                                 lport = htons(*lastport);
 443                         } while (in_pcblookup_local(pcbinfo, laddr, lport,
 444                             wild));
 445                 } else {
 446                         /*
 447                          * counting up
 448                          */
 449                         if (dorandom)
 450                                 *lastport = first +
 451                                             (arc4random() % (last - first));
 452                         count = last - first;
 453
 454                         do {
 455                                 if (count-- < 0)        /* completely used? */
 456                                         return (EADDRNOTAVAIL);
 457                                 ++*lastport;
 458                                 if (*lastport < first || *lastport > last)
 459                                         *lastport = first;
 460                                 lport = htons(*lastport);
 461                         } while (in_pcblookup_local(pcbinfo, laddr, lport,
 462                             wild));
 463                 }
 464         }
 465         if (prison_ip(cred, 0, &laddr.s_addr))
 466                 return (EINVAL);
 467         *laddrp = laddr.s_addr;
 468         *lportp = lport;
 469         return (0);
 470 }
 471
 472 /*
 473  * Connect from a socket to a specified address.
 474  * Both address and port must be specified in argument sin.
 475  * If don't have a local address for this socket yet,
 476  * then pick one.
 477  */
 478 int
 479 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 480 {
 481         u_short lport, fport;
 482         in_addr_t laddr, faddr;
 483         int anonport, error;
 484
 485         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 486         INP_LOCK_ASSERT(inp);
 487
 488         lport = inp->inp_lport;
 489         laddr = inp->inp_laddr.s_addr;
 490         anonport = (lport == 0);
 491         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 492             NULL, cred);
 493         if (error)
 494                 return (error);
 495
 496         /* Do the initial binding of the local address if required. */
 497         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 498                 inp->inp_lport = lport;
 499                 inp->inp_laddr.s_addr = laddr;
 500                 if (in_pcbinshash(inp) != 0) {
 501                         inp->inp_laddr.s_addr = INADDR_ANY;
 502                         inp->inp_lport = 0;
 503                         return (EAGAIN);
 504                 }
 505         }
 506
 507         /* Commit the remaining changes. */
 508         inp->inp_lport = lport;
 509         inp->inp_laddr.s_addr = laddr;
 510         inp->inp_faddr.s_addr = faddr;
 511         inp->inp_fport = fport;
 512         in_pcbrehash(inp);
 513 #ifdef IPSEC
 514         if (inp->inp_socket->so_type == SOCK_STREAM)
 515                 ipsec_pcbconn(inp->inp_sp);
 516 #endif
 517         if (anonport)
 518                 inp->inp_flags |= INP_ANONPORT;
 519         return (0);
 520 }
 521
 522 /*
 523  * Set up for a connect from a socket to the specified address.
 524  * On entry, *laddrp and *lportp should contain the current local
 525  * address and port for the PCB; these are updated to the values
 526  * that should be placed in inp_laddr and inp_lport to complete
 527  * the connect.
 528  *
 529  * On success, *faddrp and *fportp will be set to the remote address
 530  * and port. These are not updated in the error case.
 531  *
 532  * If the operation fails because the connection already exists,
 533  * *oinpp will be set to the PCB of that connection so that the
 534  * caller can decide to override it. In all other cases, *oinpp
 535  * is set to NULL.
 536  */
 537 int
 538 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 539     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 540     struct inpcb **oinpp, struct ucred *cred)
 541 {
 542         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 543         struct in_ifaddr *ia;
 544         struct sockaddr_in sa;
 545         struct ucred *socred;
 546         struct inpcb *oinp;
 547         struct in_addr laddr, faddr;
 548         u_short lport, fport;
 549         int error;
 550
 551         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 552         INP_LOCK_ASSERT(inp);
 553
 554         if (oinpp != NULL)
 555                 *oinpp = NULL;
 556         if (nam->sa_len != sizeof (*sin))
 557                 return (EINVAL);
 558         if (sin->sin_family != AF_INET)
 559                 return (EAFNOSUPPORT);
 560         if (sin->sin_port == 0)
 561                 return (EADDRNOTAVAIL);
 562         laddr.s_addr = *laddrp;
 563         lport = *lportp;
 564         faddr = sin->sin_addr;
 565         fport = sin->sin_port;
 566         socred = inp->inp_socket->so_cred;
 567         if (laddr.s_addr == INADDR_ANY && jailed(socred)) {
 568                 bzero(&sa, sizeof(sa));
 569                 sa.sin_addr.s_addr = htonl(prison_getip(socred));
 570                 sa.sin_len = sizeof(sa);
 571                 sa.sin_family = AF_INET;
 572                 error = in_pcbbind_setup(inp, (struct sockaddr *)&sa,
 573                     &laddr.s_addr, &lport, cred);
 574                 if (error)
 575                         return (error);
 576         }
 577         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 578                 /*
 579                  * If the destination address is INADDR_ANY,
 580                  * use the primary local address.
 581                  * If the supplied address is INADDR_BROADCAST,
 582                  * and the primary interface supports broadcast,
 583                  * choose the broadcast address for that interface.
 584                  */
 585                 if (faddr.s_addr == INADDR_ANY)
 586                         faddr = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr;
 587                 else if (faddr.s_addr == (u_long)INADDR_BROADCAST &&
 588                     (TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags &
 589                     IFF_BROADCAST))
 590                         faddr = satosin(&TAILQ_FIRST(
 591                             &in_ifaddrhead)->ia_broadaddr)->sin_addr;
 592         }
 593         if (laddr.s_addr == INADDR_ANY) {
 594                 ia = (struct in_ifaddr *)0;
 595                 /*
 596                  * If route is known our src addr is taken from the i/f,
 597                  * else punt.
 598                  *
 599                  * Find out route to destination
 600                  */
 601                 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 602                         ia = ip_rtaddr(faddr);
 603                 /*
 604                  * If we found a route, use the address corresponding to
 605                  * the outgoing interface.
 606                  *
 607                  * Otherwise assume faddr is reachable on a directly connected
 608                  * network and try to find a corresponding interface to take
 609                  * the source address from.
 610                  */
 611                 if (ia == 0) {
 612                         bzero(&sa, sizeof(sa));
 613                         sa.sin_addr = faddr;
 614                         sa.sin_len = sizeof(sa);
 615                         sa.sin_family = AF_INET;
 616
 617                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sa)));
 618                         if (ia == 0)
 619                                 ia = ifatoia(ifa_ifwithnet(sintosa(&sa)));
 620                         if (ia == 0)
 621                                 return (ENETUNREACH);
 622                 }
 623                 /*
 624                  * If the destination address is multicast and an outgoing
 625                  * interface has been set as a multicast option, use the
 626                  * address of that interface as our source address.
 627                  */
 628                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
 629                     inp->inp_moptions != NULL) {
 630                         struct ip_moptions *imo;
 631                         struct ifnet *ifp;
 632
 633                         imo = inp->inp_moptions;
 634                         if (imo->imo_multicast_ifp != NULL) {
 635                                 ifp = imo->imo_multicast_ifp;
 636                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
 637                                         if (ia->ia_ifp == ifp)
 638                                                 break;
 639                                 if (ia == 0)
 640                                         return (EADDRNOTAVAIL);
 641                         }
 642                 }
 643                 laddr = ia->ia_addr.sin_addr;
 644         }
 645
 646         oinp = in_pcblookup_hash(inp->inp_pcbinfo, faddr, fport, laddr, lport,
 647             0, NULL);
 648         if (oinp != NULL) {
 649                 if (oinpp != NULL)
 650                         *oinpp = oinp;
 651                 return (EADDRINUSE);
 652         }
 653         if (lport == 0) {
 654                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
 655                     cred);
 656                 if (error)
 657                         return (error);
 658         }
 659         *laddrp = laddr.s_addr;
 660         *lportp = lport;
 661         *faddrp = faddr.s_addr;
 662         *fportp = fport;
 663         return (0);
 664 }
 665
 666 void
 667 in_pcbdisconnect(struct inpcb *inp)
 668 {
 669
 670         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 671         INP_LOCK_ASSERT(inp);
 672
 673         inp->inp_faddr.s_addr = INADDR_ANY;
 674         inp->inp_fport = 0;
 675         in_pcbrehash(inp);
 676 #ifdef IPSEC
 677         ipsec_pcbdisconn(inp->inp_sp);
 678 #endif
 679         if (inp->inp_socket->so_state & SS_NOFDREF)
 680                 in_pcbdetach(inp);
 681 }
 682
 683 void
 684 in_pcbdetach(struct inpcb *inp)
 685 {
 686         struct socket *so = inp->inp_socket;
 687         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 688
 689         INP_INFO_WLOCK_ASSERT(ipi);
 690         INP_LOCK_ASSERT(inp);
 691
 692 #if defined(IPSEC) || defined(FAST_IPSEC)
 693         ipsec4_delete_pcbpolicy(inp);
 694 #endif /*IPSEC*/
 695         inp->inp_gencnt = ++ipi->ipi_gencnt;
 696         in_pcbremlists(inp);
 697         if (so) {
 698                 ACCEPT_LOCK();
 699                 SOCK_LOCK(so);
 700                 so->so_pcb = NULL;
 701                 sotryfree(so);
 702         }
 703         if (inp->inp_options)
 704                 (void)m_free(inp->inp_options);
 705         ip_freemoptions(inp->inp_moptions);
 706         inp->inp_vflag = 0;
 707         INP_LOCK_DESTROY(inp);
 708 #ifdef MAC
 709         mac_destroy_inpcb(inp);
 710 #endif
 711         uma_zfree(ipi->ipi_zone, inp);
 712 }
 713
 714 struct sockaddr *
 715 in_sockaddr(in_port_t port, struct in_addr *addr_p)
 716 {
 717         struct sockaddr_in *sin;
 718
 719         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 720                 M_WAITOK | M_ZERO);
 721         sin->sin_family = AF_INET;
 722         sin->sin_len = sizeof(*sin);
 723         sin->sin_addr = *addr_p;
 724         sin->sin_port = port;
 725
 726         return (struct sockaddr *)sin;
 727 }
 728
 729 /*
 730  * The wrapper function will pass down the pcbinfo for this function to lock.
 731  * The socket must have a valid
 732  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 733  * except through a kernel programming error, so it is acceptable to panic
 734  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 735  * because there actually /is/ a programming error somewhere... XXX)
 736  */
 737 int
 738 in_setsockaddr(struct socket *so, struct sockaddr **nam,
 739     struct inpcbinfo *pcbinfo)
 740 {
 741         struct inpcb *inp;
 742         struct in_addr addr;
 743         in_port_t port;
 744
 745         INP_INFO_RLOCK(pcbinfo);
 746         inp = sotoinpcb(so);
 747         if (!inp) {
 748                 INP_INFO_RUNLOCK(pcbinfo);
 749                 return ECONNRESET;
 750         }
 751         INP_LOCK(inp);
 752         port = inp->inp_lport;
 753         addr = inp->inp_laddr;
 754         INP_UNLOCK(inp);
 755         INP_INFO_RUNLOCK(pcbinfo);
 756
 757         *nam = in_sockaddr(port, &addr);
 758         return 0;
 759 }
 760
 761 /*
 762  * The wrapper function will pass down the pcbinfo for this function to lock.
 763  */
 764 int
 765 in_setpeeraddr(struct socket *so, struct sockaddr **nam,
 766     struct inpcbinfo *pcbinfo)
 767 {
 768         struct inpcb *inp;
 769         struct in_addr addr;
 770         in_port_t port;
 771
 772         INP_INFO_RLOCK(pcbinfo);
 773         inp = sotoinpcb(so);
 774         if (!inp) {
 775                 INP_INFO_RUNLOCK(pcbinfo);
 776                 return ECONNRESET;
 777         }
 778         INP_LOCK(inp);
 779         port = inp->inp_fport;
 780         addr = inp->inp_faddr;
 781         INP_UNLOCK(inp);
 782         INP_INFO_RUNLOCK(pcbinfo);
 783
 784         *nam = in_sockaddr(port, &addr);
 785         return 0;
 786 }
 787
 788 void
 789 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
 790     struct inpcb *(*notify)(struct inpcb *, int))
 791 {
 792         struct inpcb *inp, *ninp;
 793         struct inpcbhead *head;
 794
 795         INP_INFO_WLOCK(pcbinfo);
 796         head = pcbinfo->listhead;
 797         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 798                 INP_LOCK(inp);
 799                 ninp = LIST_NEXT(inp, inp_list);
 800 #ifdef INET6
 801                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 802                         INP_UNLOCK(inp);
 803                         continue;
 804                 }
 805 #endif
 806                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 807                     inp->inp_socket == NULL) {
 808                         INP_UNLOCK(inp);
 809                         continue;
 810                 }
 811                 if ((*notify)(inp, errno))
 812                         INP_UNLOCK(inp);
 813         }
 814         INP_INFO_WUNLOCK(pcbinfo);
 815 }
 816
 817 void
 818 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 819 {
 820         struct inpcb *inp;
 821         struct ip_moptions *imo;
 822         int i, gap;
 823
 824         INP_INFO_RLOCK(pcbinfo);
 825         LIST_FOREACH(inp, pcbinfo->listhead, inp_list) {
 826                 INP_LOCK(inp);
 827                 imo = inp->inp_moptions;
 828                 if ((inp->inp_vflag & INP_IPV4) &&
 829                     imo != NULL) {
 830                         /*
 831                          * Unselect the outgoing interface if it is being
 832                          * detached.
 833                          */
 834                         if (imo->imo_multicast_ifp == ifp)
 835                                 imo->imo_multicast_ifp = NULL;
 836
 837                         /*
 838                          * Drop multicast group membership if we joined
 839                          * through the interface being detached.
 840                          */
 841                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 842                             i++) {
 843                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 844                                         in_delmulti(imo->imo_membership[i]);
 845                                         gap++;
 846                                 } else if (gap != 0)
 847                                         imo->imo_membership[i - gap] =
 848                                             imo->imo_membership[i];
 849                         }
 850                         imo->imo_num_memberships -= gap;
 851                 }
 852                 INP_UNLOCK(inp);
 853         }
 854         INP_INFO_RUNLOCK(pcbinfo);
 855 }
 856
 857 /*
 858  * Lookup a PCB based on the local address and port.
 859  */
 860 #define INP_LOOKUP_MAPPED_PCB_COST      3
 861 struct inpcb *
 862 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 863     u_int lport_arg, int wild_okay)
 864 {
 865         struct inpcb *inp;
 866 #ifdef INET6
 867         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
 868 #else
 869         int matchwild = 3;
 870 #endif
 871         int wildcard;
 872         u_short lport = lport_arg;
 873
 874         INP_INFO_WLOCK_ASSERT(pcbinfo);
 875
 876         if (!wild_okay) {
 877                 struct inpcbhead *head;
 878                 /*
 879                  * Look for an unconnected (wildcard foreign addr) PCB that
 880                  * matches the local address and port we're looking for.
 881                  */
 882                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
 883                 LIST_FOREACH(inp, head, inp_hash) {
 884 #ifdef INET6
 885                         if ((inp->inp_vflag & INP_IPV4) == 0)
 886                                 continue;
 887 #endif
 888                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 889                             inp->inp_laddr.s_addr == laddr.s_addr &&
 890                             inp->inp_lport == lport) {
 891                                 /*
 892                                  * Found.
 893                                  */
 894                                 return (inp);
 895                         }
 896                 }
 897                 /*
 898                  * Not found.
 899                  */
 900                 return (NULL);
 901         } else {
 902                 struct inpcbporthead *porthash;
 903                 struct inpcbport *phd;
 904                 struct inpcb *match = NULL;
 905                 /*
 906                  * Best fit PCB lookup.
 907                  *
 908                  * First see if this local port is in use by looking on the
 909                  * port hash list.
 910                  */
 911                 retrylookup:
 912                 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 913                     pcbinfo->porthashmask)];
 914                 LIST_FOREACH(phd, porthash, phd_hash) {
 915                         if (phd->phd_port == lport)
 916                                 break;
 917                 }
 918                 if (phd != NULL) {
 919                         /*
 920                          * Port is in use by one or more PCBs. Look for best
 921                          * fit.
 922                          */
 923                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 924                                 wildcard = 0;
 925 #ifdef INET6
 926                                 if ((inp->inp_vflag & INP_IPV4) == 0)
 927                                         continue;
 928                                 /*
 929                                  * We never select the PCB that has
 930                                  * INP_IPV6 flag and is bound to :: if
 931                                  * we have another PCB which is bound
 932                                  * to 0.0.0.0.  If a PCB has the
 933                                  * INP_IPV6 flag, then we set its cost
 934                                  * higher than IPv4 only PCBs.
 935                                  *
 936                                  * Note that the case only happens
 937                                  * when a socket is bound to ::, under
 938                                  * the condition that the use of the
 939                                  * mapped address is allowed.
 940                                  */
 941                                 if ((inp->inp_vflag & INP_IPV6) != 0)
 942                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
 943 #endif
 944                                 /*
 945                                  * Clean out old time_wait sockets if they
 946                                  * are clogging up needed local ports.
 947                                  */
 948                                 if ((inp->inp_vflag & INP_TIMEWAIT) != 0) {
 949                                         if (tcp_twrecycleable((struct tcptw *)inp->inp_ppcb)) {
 950                                                 INP_LOCK(inp);
 951                                                 tcp_twclose((struct tcptw *)inp->inp_ppcb, 0);
 952                                                 match = NULL;
 953                                                 goto retrylookup;
 954                                         }
 955                                 }
 956                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
 957                                         wildcard++;
 958                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
 959                                         if (laddr.s_addr == INADDR_ANY)
 960                                                 wildcard++;
 961                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
 962                                                 continue;
 963                                 } else {
 964                                         if (laddr.s_addr != INADDR_ANY)
 965                                                 wildcard++;
 966                                 }
 967                                 if (wildcard < matchwild) {
 968                                         match = inp;
 969                                         matchwild = wildcard;
 970                                         if (matchwild == 0) {
 971                                                 break;
 972                                         }
 973                                 }
 974                         }
 975                 }
 976                 return (match);
 977         }
 978 }
 979 #undef INP_LOOKUP_MAPPED_PCB_COST
 980
 981 /*
 982  * Lookup PCB in hash list.
 983  */
 984 struct inpcb *
 985 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
 986     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int wildcard,
 987     struct ifnet *ifp)
 988 {
 989         struct inpcbhead *head;
 990         struct inpcb *inp;
 991         u_short fport = fport_arg, lport = lport_arg;
 992
 993         INP_INFO_RLOCK_ASSERT(pcbinfo);
 994         /*
 995          * First look for an exact match.
 996          */
 997         head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)];
 998         LIST_FOREACH(inp, head, inp_hash) {
 999 #ifdef INET6
1000                 if ((inp->inp_vflag & INP_IPV4) == 0)
1001                         continue;
1002 #endif
1003                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1004                     inp->inp_laddr.s_addr == laddr.s_addr &&
1005                     inp->inp_fport == fport &&
1006                     inp->inp_lport == lport) {
1007                         /*
1008                          * Found.
1009                          */
1010                         return (inp);
1011                 }
1012         }
1013         if (wildcard) {
1014                 struct inpcb *local_wild = NULL;
1015 #if defined(INET6)
1016                 struct inpcb *local_wild_mapped = NULL;
1017 #endif /* defined(INET6) */
1018
1019                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
1020                 LIST_FOREACH(inp, head, inp_hash) {
1021 #ifdef INET6
1022                         if ((inp->inp_vflag & INP_IPV4) == 0)
1023                                 continue;
1024 #endif
1025                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1026                             inp->inp_lport == lport) {
1027                                 if (ifp && ifp->if_type == IFT_FAITH &&
1028                                     (inp->inp_flags & INP_FAITH) == 0)
1029                                         continue;
1030                                 if (inp->inp_laddr.s_addr == laddr.s_addr)
1031                                         return (inp);
1032                                 else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1033 #if defined(INET6)
1034                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
1035                                                              AF_INET6))
1036                                                 local_wild_mapped = inp;
1037                                         else
1038 #endif /* defined(INET6) */
1039                                         local_wild = inp;
1040                                 }
1041                         }
1042                 }
1043 #if defined(INET6)
1044                 if (local_wild == NULL)
1045                         return (local_wild_mapped);
1046 #endif /* defined(INET6) */
1047                 return (local_wild);
1048         }
1049
1050         /*
1051          * Not found.
1052          */
1053         return (NULL);
1054 }
1055
1056 /*
1057  * Insert PCB onto various hash lists.
1058  */
1059 int
1060 in_pcbinshash(struct inpcb *inp)
1061 {
1062         struct inpcbhead *pcbhash;
1063         struct inpcbporthead *pcbporthash;
1064         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1065         struct inpcbport *phd;
1066         u_int32_t hashkey_faddr;
1067
1068         INP_INFO_WLOCK_ASSERT(pcbinfo);
1069 #ifdef INET6
1070         if (inp->inp_vflag & INP_IPV6)
1071                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1072         else
1073 #endif /* INET6 */
1074         hashkey_faddr = inp->inp_faddr.s_addr;
1075
1076         pcbhash = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
1077                  inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
1078
1079         pcbporthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(inp->inp_lport,
1080             pcbinfo->porthashmask)];
1081
1082         /*
1083          * Go through port list and look for a head for this lport.
1084          */
1085         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1086                 if (phd->phd_port == inp->inp_lport)
1087                         break;
1088         }
1089         /*
1090          * If none exists, malloc one and tack it on.
1091          */
1092         if (phd == NULL) {
1093                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1094                 if (phd == NULL) {
1095                         return (ENOBUFS); /* XXX */
1096                 }
1097                 phd->phd_port = inp->inp_lport;
1098                 LIST_INIT(&phd->phd_pcblist);
1099                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1100         }
1101         inp->inp_phd = phd;
1102         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1103         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1104         return (0);
1105 }
1106
1107 /*
1108  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1109  * changed. NOTE: This does not handle the case of the lport changing (the
1110  * hashed port list would have to be updated as well), so the lport must
1111  * not change after in_pcbinshash() has been called.
1112  */
1113 void
1114 in_pcbrehash(struct inpcb *inp)
1115 {
1116         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1117         struct inpcbhead *head;
1118         u_int32_t hashkey_faddr;
1119
1120         INP_INFO_WLOCK_ASSERT(pcbinfo);
1121         INP_LOCK_ASSERT(inp);
1122 #ifdef INET6
1123         if (inp->inp_vflag & INP_IPV6)
1124                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1125         else
1126 #endif /* INET6 */
1127         hashkey_faddr = inp->inp_faddr.s_addr;
1128
1129         head = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
1130                 inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
1131
1132         LIST_REMOVE(inp, inp_hash);
1133         LIST_INSERT_HEAD(head, inp, inp_hash);
1134 }
1135
1136 /*
1137  * Remove PCB from various lists.
1138  */
1139 void
1140 in_pcbremlists(struct inpcb *inp)
1141 {
1142         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1143
1144         INP_INFO_WLOCK_ASSERT(pcbinfo);
1145         INP_LOCK_ASSERT(inp);
1146
1147         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1148         if (inp->inp_lport) {
1149                 struct inpcbport *phd = inp->inp_phd;
1150
1151                 LIST_REMOVE(inp, inp_hash);
1152                 LIST_REMOVE(inp, inp_portlist);
1153                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1154                         LIST_REMOVE(phd, phd_hash);
1155                         free(phd, M_PCB);
1156                 }
1157         }
1158         LIST_REMOVE(inp, inp_list);
1159         pcbinfo->ipi_count--;
1160 }
1161
1162 /*
1163  * A set label operation has occurred at the socket layer, propagate the
1164  * label change into the in_pcb for the socket.
1165  */
1166 void
1167 in_pcbsosetlabel(struct socket *so)
1168 {
1169 #ifdef MAC
1170         struct inpcb *inp;
1171
1172         inp = (struct inpcb *)so->so_pcb;
1173         INP_LOCK(inp);
1174         SOCK_LOCK(so);
1175         mac_inpcb_sosetlabel(so, inp);
1176         SOCK_UNLOCK(so);
1177         INP_UNLOCK(inp);
1178 #endif
1179 }
1180
1181 /*
1182  * ipport_tick runs once per second, determining if random port
1183  * allocation should be continued.  If more than ipport_randomcps
1184  * ports have been allocated in the last second, then we return to
1185  * sequential port allocation. We return to random allocation only
1186  * once we drop below ipport_randomcps for at least ipport_randomtime
1187  * seconds.
1188  */
1189
1190 void
1191 ipport_tick(void *xtp)
1192 {
1193         if (ipport_tcpallocs > ipport_tcplastcount + ipport_randomcps) {
1194                 ipport_stoprandom = ipport_randomtime;
1195         } else {
1196                 if (ipport_stoprandom > 0)
1197                         ipport_stoprandom--;
1198         }
1199         ipport_tcplastcount = ipport_tcpallocs;
1200         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
1201 }