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  * On success return with the PCB locked.
 171  */
 172 int
 173 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 174 {
 175         struct inpcb *inp;
 176         int error;
 177
 178         INP_INFO_WLOCK_ASSERT(pcbinfo);
 179         error = 0;
 180         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
 181         if (inp == NULL)
 182                 return (ENOBUFS);
 183         bzero(inp,inp_zero_size);
 184         inp->inp_pcbinfo = pcbinfo;
 185         inp->inp_socket = so;
 186 #ifdef MAC
 187         error = mac_init_inpcb(inp, M_NOWAIT);
 188         if (error != 0)
 189                 goto out;
 190         SOCK_LOCK(so);
 191         mac_create_inpcb_from_socket(so, inp);
 192         SOCK_UNLOCK(so);
 193 #endif
 194 #if defined(IPSEC) || defined(FAST_IPSEC)
 195 #ifdef FAST_IPSEC
 196         error = ipsec_init_policy(so, &inp->inp_sp);
 197 #else
 198         error = ipsec_init_pcbpolicy(so, &inp->inp_sp);
 199 #endif
 200         if (error != 0)
 201                 goto out;
 202 #endif /*IPSEC*/
 203 #if defined(INET6)
 204         if (INP_SOCKAF(so) == AF_INET6) {
 205                 inp->inp_vflag |= INP_IPV6PROTO;
 206                 if (ip6_v6only)
 207                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 208         }
 209 #endif
 210         LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
 211         pcbinfo->ipi_count++;
 212         so->so_pcb = (caddr_t)inp;
 213 #ifdef INET6
 214         if (ip6_auto_flowlabel)
 215                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 216 #endif
 217         INP_LOCK(inp);
 218         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 219
 220 #if defined(IPSEC) || defined(FAST_IPSEC) || defined(MAC)
 221 out:
 222         if (error != 0)
 223                 uma_zfree(pcbinfo->ipi_zone, inp);
 224 #endif
 225         return (error);
 226 }
 227
 228 int
 229 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 230 {
 231         int anonport, error;
 232
 233         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 234         INP_LOCK_ASSERT(inp);
 235
 236         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 237                 return (EINVAL);
 238         anonport = inp->inp_lport == 0 && (nam == NULL ||
 239             ((struct sockaddr_in *)nam)->sin_port == 0);
 240         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 241             &inp->inp_lport, cred);
 242         if (error)
 243                 return (error);
 244         if (in_pcbinshash(inp) != 0) {
 245                 inp->inp_laddr.s_addr = INADDR_ANY;
 246                 inp->inp_lport = 0;
 247                 return (EAGAIN);
 248         }
 249         if (anonport)
 250                 inp->inp_flags |= INP_ANONPORT;
 251         return (0);
 252 }
 253
 254 /*
 255  * Set up a bind operation on a PCB, performing port allocation
 256  * as required, but do not actually modify the PCB. Callers can
 257  * either complete the bind by setting inp_laddr/inp_lport and
 258  * calling in_pcbinshash(), or they can just use the resulting
 259  * port and address to authorise the sending of a once-off packet.
 260  *
 261  * On error, the values of *laddrp and *lportp are not changed.
 262  */
 263 int
 264 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 265     u_short *lportp, struct ucred *cred)
 266 {
 267         struct socket *so = inp->inp_socket;
 268         unsigned short *lastport;
 269         struct sockaddr_in *sin;
 270         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 271         struct in_addr laddr;
 272         u_short lport = 0;
 273         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 274         int error, prison = 0;
 275         int dorandom;
 276
 277         INP_INFO_WLOCK_ASSERT(pcbinfo);
 278         INP_LOCK_ASSERT(inp);
 279
 280         if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
 281                 return (EADDRNOTAVAIL);
 282         laddr.s_addr = *laddrp;
 283         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 284                 return (EINVAL);
 285         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 286                 wild = INPLOOKUP_WILDCARD;
 287         if (nam) {
 288                 sin = (struct sockaddr_in *)nam;
 289                 if (nam->sa_len != sizeof (*sin))
 290                         return (EINVAL);
 291 #ifdef notdef
 292                 /*
 293                  * We should check the family, but old programs
 294                  * incorrectly fail to initialize it.
 295                  */
 296                 if (sin->sin_family != AF_INET)
 297                         return (EAFNOSUPPORT);
 298 #endif
 299                 if (sin->sin_addr.s_addr != INADDR_ANY)
 300                         if (prison_ip(cred, 0, &sin->sin_addr.s_addr))
 301                                 return(EINVAL);
 302                 if (sin->sin_port != *lportp) {
 303                         /* Don't allow the port to change. */
 304                         if (*lportp != 0)
 305                                 return (EINVAL);
 306                         lport = sin->sin_port;
 307                 }
 308                 /* NB: lport is left as 0 if the port isn't being changed. */
 309                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 310                         /*
 311                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 312                          * allow complete duplication of binding if
 313                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 314                          * and a multicast address is bound on both
 315                          * new and duplicated sockets.
 316                          */
 317                         if (so->so_options & SO_REUSEADDR)
 318                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 319                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 320                         sin->sin_port = 0;              /* yech... */
 321                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 322                         if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
 323                                 return (EADDRNOTAVAIL);
 324                 }
 325                 laddr = sin->sin_addr;
 326                 if (lport) {
 327                         struct inpcb *t;
 328                         struct tcptw *tw;
 329
 330                         /* GROSS */
 331                         if (ntohs(lport) <= ipport_reservedhigh &&
 332                             ntohs(lport) >= ipport_reservedlow &&
 333                             suser_cred(cred, SUSER_ALLOWJAIL))
 334                                 return (EACCES);
 335                         if (jailed(cred))
 336                                 prison = 1;
 337                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 338                             suser_cred(so->so_cred, SUSER_ALLOWJAIL) != 0) {
 339                                 t = in_pcblookup_local(inp->inp_pcbinfo,
 340                                     sin->sin_addr, lport,
 341                                     prison ? 0 :  INPLOOKUP_WILDCARD);
 342         /*
 343          * XXX
 344          * This entire block sorely needs a rewrite.
 345          */
 346                                 if (t &&
 347                                     ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
 348                                     (so->so_type != SOCK_STREAM ||
 349                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
 350                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
 351                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 352                                      (t->inp_socket->so_options &
 353                                          SO_REUSEPORT) == 0) &&
 354                                     (so->so_cred->cr_uid !=
 355                                      t->inp_socket->so_cred->cr_uid))
 356                                         return (EADDRINUSE);
 357                         }
 358                         if (prison && prison_ip(cred, 0, &sin->sin_addr.s_addr))
 359                                 return (EADDRNOTAVAIL);
 360                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 361                             lport, prison ? 0 : wild);
 362                         if (t && (t->inp_vflag & INP_TIMEWAIT)) {
 363                                 /*
 364                                  * XXXRW: If an incpb has had its timewait
 365                                  * state recycled, we treat the address as
 366                                  * being in use (for now).  This is better
 367                                  * than a panic, but not desirable.
 368                                  */
 369                                 tw = intotw(inp);
 370                                 if (tw == NULL ||
 371                                     (reuseport & tw->tw_so_options) == 0)
 372                                         return (EADDRINUSE);
 373                         } else if (t &&
 374                             (reuseport & t->inp_socket->so_options) == 0) {
 375 #if defined(INET6)
 376                                 if (ntohl(sin->sin_addr.s_addr) !=
 377                                     INADDR_ANY ||
 378                                     ntohl(t->inp_laddr.s_addr) !=
 379                                     INADDR_ANY ||
 380                                     INP_SOCKAF(so) ==
 381                                     INP_SOCKAF(t->inp_socket))
 382 #endif /* defined(INET6) */
 383                                 return (EADDRINUSE);
 384                         }
 385                 }
 386         }
 387         if (*lportp != 0)
 388                 lport = *lportp;
 389         if (lport == 0) {
 390                 u_short first, last;
 391                 int count;
 392
 393                 if (laddr.s_addr != INADDR_ANY)
 394                         if (prison_ip(cred, 0, &laddr.s_addr))
 395                                 return (EINVAL);
 396
 397                 if (inp->inp_flags & INP_HIGHPORT) {
 398                         first = ipport_hifirstauto;     /* sysctl */
 399                         last  = ipport_hilastauto;
 400                         lastport = &pcbinfo->lasthi;
 401                 } else if (inp->inp_flags & INP_LOWPORT) {
 402                         if ((error = suser_cred(cred, SUSER_ALLOWJAIL)) != 0)
 403                                 return error;
 404                         first = ipport_lowfirstauto;    /* 1023 */
 405                         last  = ipport_lowlastauto;     /* 600 */
 406                         lastport = &pcbinfo->lastlow;
 407                 } else {
 408                         first = ipport_firstauto;       /* sysctl */
 409                         last  = ipport_lastauto;
 410                         lastport = &pcbinfo->lastport;
 411                 }
 412                 /*
 413                  * For UDP, use random port allocation as long as the user
 414                  * allows it.  For TCP (and as of yet unknown) connections,
 415                  * use random port allocation only if the user allows it AND
 416                  * ipport_tick() allows it.
 417                  */
 418                 if (ipport_randomized &&
 419                         (!ipport_stoprandom || pcbinfo == &udbinfo))
 420                         dorandom = 1;
 421                 else
 422                         dorandom = 0;
 423                 /*
 424                  * It makes no sense to do random port allocation if
 425                  * we have the only port available.
 426                  */
 427                 if (first == last)
 428                         dorandom = 0;
 429                 /* Make sure to not include UDP packets in the count. */
 430                 if (pcbinfo != &udbinfo)
 431                         ipport_tcpallocs++;
 432                 /*
 433                  * Simple check to ensure all ports are not used up causing
 434                  * a deadlock here.
 435                  *
 436                  * We split the two cases (up and down) so that the direction
 437                  * is not being tested on each round of the loop.
 438                  */
 439                 if (first > last) {
 440                         /*
 441                          * counting down
 442                          */
 443                         if (dorandom)
 444                                 *lastport = first -
 445                                             (arc4random() % (first - last));
 446                         count = first - last;
 447
 448                         do {
 449                                 if (count-- < 0)        /* completely used? */
 450                                         return (EADDRNOTAVAIL);
 451                                 --*lastport;
 452                                 if (*lastport > first || *lastport < last)
 453                                         *lastport = first;
 454                                 lport = htons(*lastport);
 455                         } while (in_pcblookup_local(pcbinfo, laddr, lport,
 456                             wild));
 457                 } else {
 458                         /*
 459                          * counting up
 460                          */
 461                         if (dorandom)
 462                                 *lastport = first +
 463                                             (arc4random() % (last - first));
 464                         count = last - first;
 465
 466                         do {
 467                                 if (count-- < 0)        /* completely used? */
 468                                         return (EADDRNOTAVAIL);
 469                                 ++*lastport;
 470                                 if (*lastport < first || *lastport > last)
 471                                         *lastport = first;
 472                                 lport = htons(*lastport);
 473                         } while (in_pcblookup_local(pcbinfo, laddr, lport,
 474                             wild));
 475                 }
 476         }
 477         if (prison_ip(cred, 0, &laddr.s_addr))
 478                 return (EINVAL);
 479         *laddrp = laddr.s_addr;
 480         *lportp = lport;
 481         return (0);
 482 }
 483
 484 /*
 485  * Connect from a socket to a specified address.
 486  * Both address and port must be specified in argument sin.
 487  * If don't have a local address for this socket yet,
 488  * then pick one.
 489  */
 490 int
 491 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 492 {
 493         u_short lport, fport;
 494         in_addr_t laddr, faddr;
 495         int anonport, error;
 496
 497         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 498         INP_LOCK_ASSERT(inp);
 499
 500         lport = inp->inp_lport;
 501         laddr = inp->inp_laddr.s_addr;
 502         anonport = (lport == 0);
 503         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 504             NULL, cred);
 505         if (error)
 506                 return (error);
 507
 508         /* Do the initial binding of the local address if required. */
 509         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 510                 inp->inp_lport = lport;
 511                 inp->inp_laddr.s_addr = laddr;
 512                 if (in_pcbinshash(inp) != 0) {
 513                         inp->inp_laddr.s_addr = INADDR_ANY;
 514                         inp->inp_lport = 0;
 515                         return (EAGAIN);
 516                 }
 517         }
 518
 519         /* Commit the remaining changes. */
 520         inp->inp_lport = lport;
 521         inp->inp_laddr.s_addr = laddr;
 522         inp->inp_faddr.s_addr = faddr;
 523         inp->inp_fport = fport;
 524         in_pcbrehash(inp);
 525 #ifdef IPSEC
 526         if (inp->inp_socket->so_type == SOCK_STREAM)
 527                 ipsec_pcbconn(inp->inp_sp);
 528 #endif
 529         if (anonport)
 530                 inp->inp_flags |= INP_ANONPORT;
 531         return (0);
 532 }
 533
 534 /*
 535  * Set up for a connect from a socket to the specified address.
 536  * On entry, *laddrp and *lportp should contain the current local
 537  * address and port for the PCB; these are updated to the values
 538  * that should be placed in inp_laddr and inp_lport to complete
 539  * the connect.
 540  *
 541  * On success, *faddrp and *fportp will be set to the remote address
 542  * and port. These are not updated in the error case.
 543  *
 544  * If the operation fails because the connection already exists,
 545  * *oinpp will be set to the PCB of that connection so that the
 546  * caller can decide to override it. In all other cases, *oinpp
 547  * is set to NULL.
 548  */
 549 int
 550 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 551     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 552     struct inpcb **oinpp, struct ucred *cred)
 553 {
 554         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 555         struct in_ifaddr *ia;
 556         struct sockaddr_in sa;
 557         struct ucred *socred;
 558         struct inpcb *oinp;
 559         struct in_addr laddr, faddr;
 560         u_short lport, fport;
 561         int error;
 562
 563         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 564         INP_LOCK_ASSERT(inp);
 565
 566         if (oinpp != NULL)
 567                 *oinpp = NULL;
 568         if (nam->sa_len != sizeof (*sin))
 569                 return (EINVAL);
 570         if (sin->sin_family != AF_INET)
 571                 return (EAFNOSUPPORT);
 572         if (sin->sin_port == 0)
 573                 return (EADDRNOTAVAIL);
 574         laddr.s_addr = *laddrp;
 575         lport = *lportp;
 576         faddr = sin->sin_addr;
 577         fport = sin->sin_port;
 578         socred = inp->inp_socket->so_cred;
 579         if (laddr.s_addr == INADDR_ANY && jailed(socred)) {
 580                 bzero(&sa, sizeof(sa));
 581                 sa.sin_addr.s_addr = htonl(prison_getip(socred));
 582                 sa.sin_len = sizeof(sa);
 583                 sa.sin_family = AF_INET;
 584                 error = in_pcbbind_setup(inp, (struct sockaddr *)&sa,
 585                     &laddr.s_addr, &lport, cred);
 586                 if (error)
 587                         return (error);
 588         }
 589         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 590                 /*
 591                  * If the destination address is INADDR_ANY,
 592                  * use the primary local address.
 593                  * If the supplied address is INADDR_BROADCAST,
 594                  * and the primary interface supports broadcast,
 595                  * choose the broadcast address for that interface.
 596                  */
 597                 if (faddr.s_addr == INADDR_ANY)
 598                         faddr = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr;
 599                 else if (faddr.s_addr == (u_long)INADDR_BROADCAST &&
 600                     (TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags &
 601                     IFF_BROADCAST))
 602                         faddr = satosin(&TAILQ_FIRST(
 603                             &in_ifaddrhead)->ia_broadaddr)->sin_addr;
 604         }
 605         if (laddr.s_addr == INADDR_ANY) {
 606                 ia = (struct in_ifaddr *)0;
 607                 /*
 608                  * If route is known our src addr is taken from the i/f,
 609                  * else punt.
 610                  *
 611                  * Find out route to destination
 612                  */
 613                 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 614                         ia = ip_rtaddr(faddr);
 615                 /*
 616                  * If we found a route, use the address corresponding to
 617                  * the outgoing interface.
 618                  *
 619                  * Otherwise assume faddr is reachable on a directly connected
 620                  * network and try to find a corresponding interface to take
 621                  * the source address from.
 622                  */
 623                 if (ia == 0) {
 624                         bzero(&sa, sizeof(sa));
 625                         sa.sin_addr = faddr;
 626                         sa.sin_len = sizeof(sa);
 627                         sa.sin_family = AF_INET;
 628
 629                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sa)));
 630                         if (ia == 0)
 631                                 ia = ifatoia(ifa_ifwithnet(sintosa(&sa)));
 632                         if (ia == 0)
 633                                 return (ENETUNREACH);
 634                 }
 635                 /*
 636                  * If the destination address is multicast and an outgoing
 637                  * interface has been set as a multicast option, use the
 638                  * address of that interface as our source address.
 639                  */
 640                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
 641                     inp->inp_moptions != NULL) {
 642                         struct ip_moptions *imo;
 643                         struct ifnet *ifp;
 644
 645                         imo = inp->inp_moptions;
 646                         if (imo->imo_multicast_ifp != NULL) {
 647                                 ifp = imo->imo_multicast_ifp;
 648                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
 649                                         if (ia->ia_ifp == ifp)
 650                                                 break;
 651                                 if (ia == 0)
 652                                         return (EADDRNOTAVAIL);
 653                         }
 654                 }
 655                 laddr = ia->ia_addr.sin_addr;
 656         }
 657
 658         oinp = in_pcblookup_hash(inp->inp_pcbinfo, faddr, fport, laddr, lport,
 659             0, NULL);
 660         if (oinp != NULL) {
 661                 if (oinpp != NULL)
 662                         *oinpp = oinp;
 663                 return (EADDRINUSE);
 664         }
 665         if (lport == 0) {
 666                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
 667                     cred);
 668                 if (error)
 669                         return (error);
 670         }
 671         *laddrp = laddr.s_addr;
 672         *lportp = lport;
 673         *faddrp = faddr.s_addr;
 674         *fportp = fport;
 675         return (0);
 676 }
 677
 678 void
 679 in_pcbdisconnect(struct inpcb *inp)
 680 {
 681
 682         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 683         INP_LOCK_ASSERT(inp);
 684
 685         inp->inp_faddr.s_addr = INADDR_ANY;
 686         inp->inp_fport = 0;
 687         in_pcbrehash(inp);
 688 #ifdef IPSEC
 689         ipsec_pcbdisconn(inp->inp_sp);
 690 #endif
 691 }
 692
 693 /*
 694  * In the old world order, in_pcbdetach() served two functions: to detach the
 695  * pcb from the socket/potentially free the socket, and to free the pcb
 696  * itself.  In the new world order, the protocol code is responsible for
 697  * managing the relationship with the socket, and this code simply frees the
 698  * pcb.
 699  */
 700 void
 701 in_pcbdetach(struct inpcb *inp)
 702 {
 703
 704         KASSERT(inp->inp_socket != NULL, ("in_pcbdetach: inp_socket == NULL"));
 705         inp->inp_socket->so_pcb = NULL;
 706         inp->inp_socket = NULL;
 707 }
 708
 709 void
 710 in_pcbfree(struct inpcb *inp)
 711 {
 712         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 713
 714         KASSERT(inp->inp_socket == NULL, ("in_pcbfree: inp_socket != NULL"));
 715         INP_INFO_WLOCK_ASSERT(ipi);
 716         INP_LOCK_ASSERT(inp);
 717
 718 #if defined(IPSEC) || defined(FAST_IPSEC)
 719         ipsec4_delete_pcbpolicy(inp);
 720 #endif /*IPSEC*/
 721         inp->inp_gencnt = ++ipi->ipi_gencnt;
 722         in_pcbremlists(inp);
 723         if (inp->inp_options)
 724                 (void)m_free(inp->inp_options);
 725         ip_freemoptions(inp->inp_moptions);
 726         inp->inp_vflag = 0;
 727
 728 #ifdef MAC
 729         mac_destroy_inpcb(inp);
 730 #endif
 731         INP_UNLOCK(inp);
 732         uma_zfree(ipi->ipi_zone, inp);
 733 }
 734
 735 /*
 736  * TCP needs to maintain its inpcb structure after the TCP connection has
 737  * been torn down.  However, it must be disconnected from the inpcb hashes as
 738  * it must not prevent binding of future connections to the same port/ip
 739  * combination by other inpcbs.
 740  */
 741 void
 742 in_pcbdrop(struct inpcb *inp)
 743 {
 744
 745         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 746         INP_LOCK_ASSERT(inp);
 747
 748         inp->inp_vflag |= INP_DROPPED;
 749         if (inp->inp_lport) {
 750                 struct inpcbport *phd = inp->inp_phd;
 751
 752                 LIST_REMOVE(inp, inp_hash);
 753                 LIST_REMOVE(inp, inp_portlist);
 754                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 755                         LIST_REMOVE(phd, phd_hash);
 756                         free(phd, M_PCB);
 757                 }
 758                 inp->inp_lport = 0;
 759         }
 760 }
 761
 762 struct sockaddr *
 763 in_sockaddr(in_port_t port, struct in_addr *addr_p)
 764 {
 765         struct sockaddr_in *sin;
 766
 767         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 768                 M_WAITOK | M_ZERO);
 769         sin->sin_family = AF_INET;
 770         sin->sin_len = sizeof(*sin);
 771         sin->sin_addr = *addr_p;
 772         sin->sin_port = port;
 773
 774         return (struct sockaddr *)sin;
 775 }
 776
 777 /*
 778  * The wrapper function will pass down the pcbinfo for this function to lock.
 779  * The socket must have a valid
 780  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 781  * except through a kernel programming error, so it is acceptable to panic
 782  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 783  * because there actually /is/ a programming error somewhere... XXX)
 784  */
 785 int
 786 in_setsockaddr(struct socket *so, struct sockaddr **nam,
 787     struct inpcbinfo *pcbinfo)
 788 {
 789         struct inpcb *inp;
 790         struct in_addr addr;
 791         in_port_t port;
 792
 793         inp = sotoinpcb(so);
 794         KASSERT(inp != NULL, ("in_setsockaddr: inp == NULL"));
 795
 796         INP_LOCK(inp);
 797         port = inp->inp_lport;
 798         addr = inp->inp_laddr;
 799         INP_UNLOCK(inp);
 800
 801         *nam = in_sockaddr(port, &addr);
 802         return 0;
 803 }
 804
 805 /*
 806  * The wrapper function will pass down the pcbinfo for this function to lock.
 807  */
 808 int
 809 in_setpeeraddr(struct socket *so, struct sockaddr **nam,
 810     struct inpcbinfo *pcbinfo)
 811 {
 812         struct inpcb *inp;
 813         struct in_addr addr;
 814         in_port_t port;
 815
 816         inp = sotoinpcb(so);
 817         KASSERT(inp != NULL, ("in_setpeeraddr: inp == NULL"));
 818
 819         INP_LOCK(inp);
 820         port = inp->inp_fport;
 821         addr = inp->inp_faddr;
 822         INP_UNLOCK(inp);
 823
 824         *nam = in_sockaddr(port, &addr);
 825         return 0;
 826 }
 827
 828 void
 829 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
 830     struct inpcb *(*notify)(struct inpcb *, int))
 831 {
 832         struct inpcb *inp, *ninp;
 833         struct inpcbhead *head;
 834
 835         INP_INFO_WLOCK(pcbinfo);
 836         head = pcbinfo->listhead;
 837         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 838                 INP_LOCK(inp);
 839                 ninp = LIST_NEXT(inp, inp_list);
 840 #ifdef INET6
 841                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 842                         INP_UNLOCK(inp);
 843                         continue;
 844                 }
 845 #endif
 846                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 847                     inp->inp_socket == NULL) {
 848                         INP_UNLOCK(inp);
 849                         continue;
 850                 }
 851                 if ((*notify)(inp, errno))
 852                         INP_UNLOCK(inp);
 853         }
 854         INP_INFO_WUNLOCK(pcbinfo);
 855 }
 856
 857 void
 858 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 859 {
 860         struct inpcb *inp;
 861         struct ip_moptions *imo;
 862         int i, gap;
 863
 864         INP_INFO_RLOCK(pcbinfo);
 865         LIST_FOREACH(inp, pcbinfo->listhead, inp_list) {
 866                 INP_LOCK(inp);
 867                 imo = inp->inp_moptions;
 868                 if ((inp->inp_vflag & INP_IPV4) &&
 869                     imo != NULL) {
 870                         /*
 871                          * Unselect the outgoing interface if it is being
 872                          * detached.
 873                          */
 874                         if (imo->imo_multicast_ifp == ifp)
 875                                 imo->imo_multicast_ifp = NULL;
 876
 877                         /*
 878                          * Drop multicast group membership if we joined
 879                          * through the interface being detached.
 880                          */
 881                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 882                             i++) {
 883                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 884                                         in_delmulti(imo->imo_membership[i]);
 885                                         gap++;
 886                                 } else if (gap != 0)
 887                                         imo->imo_membership[i - gap] =
 888                                             imo->imo_membership[i];
 889                         }
 890                         imo->imo_num_memberships -= gap;
 891                 }
 892                 INP_UNLOCK(inp);
 893         }
 894         INP_INFO_RUNLOCK(pcbinfo);
 895 }
 896
 897 /*
 898  * Lookup a PCB based on the local address and port.
 899  */
 900 #define INP_LOOKUP_MAPPED_PCB_COST      3
 901 struct inpcb *
 902 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 903     u_int lport_arg, int wild_okay)
 904 {
 905         struct inpcb *inp;
 906         struct tcptw *tw;
 907 #ifdef INET6
 908         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
 909 #else
 910         int matchwild = 3;
 911 #endif
 912         int wildcard;
 913         u_short lport = lport_arg;
 914
 915         INP_INFO_WLOCK_ASSERT(pcbinfo);
 916
 917         if (!wild_okay) {
 918                 struct inpcbhead *head;
 919                 /*
 920                  * Look for an unconnected (wildcard foreign addr) PCB that
 921                  * matches the local address and port we're looking for.
 922                  */
 923                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
 924                 LIST_FOREACH(inp, head, inp_hash) {
 925 #ifdef INET6
 926                         if ((inp->inp_vflag & INP_IPV4) == 0)
 927                                 continue;
 928 #endif
 929                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 930                             inp->inp_laddr.s_addr == laddr.s_addr &&
 931                             inp->inp_lport == lport) {
 932                                 /*
 933                                  * Found.
 934                                  */
 935                                 return (inp);
 936                         }
 937                 }
 938                 /*
 939                  * Not found.
 940                  */
 941                 return (NULL);
 942         } else {
 943                 struct inpcbporthead *porthash;
 944                 struct inpcbport *phd;
 945                 struct inpcb *match = NULL;
 946                 /*
 947                  * Best fit PCB lookup.
 948                  *
 949                  * First see if this local port is in use by looking on the
 950                  * port hash list.
 951                  */
 952                 retrylookup:
 953                 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 954                     pcbinfo->porthashmask)];
 955                 LIST_FOREACH(phd, porthash, phd_hash) {
 956                         if (phd->phd_port == lport)
 957                                 break;
 958                 }
 959                 if (phd != NULL) {
 960                         /*
 961                          * Port is in use by one or more PCBs. Look for best
 962                          * fit.
 963                          */
 964                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 965                                 wildcard = 0;
 966 #ifdef INET6
 967                                 if ((inp->inp_vflag & INP_IPV4) == 0)
 968                                         continue;
 969                                 /*
 970                                  * We never select the PCB that has
 971                                  * INP_IPV6 flag and is bound to :: if
 972                                  * we have another PCB which is bound
 973                                  * to 0.0.0.0.  If a PCB has the
 974                                  * INP_IPV6 flag, then we set its cost
 975                                  * higher than IPv4 only PCBs.
 976                                  *
 977                                  * Note that the case only happens
 978                                  * when a socket is bound to ::, under
 979                                  * the condition that the use of the
 980                                  * mapped address is allowed.
 981                                  */
 982                                 if ((inp->inp_vflag & INP_IPV6) != 0)
 983                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
 984 #endif
 985                                 /*
 986                                  * Clean out old time_wait sockets if they
 987                                  * are clogging up needed local ports.
 988                                  */
 989                                 if ((inp->inp_vflag & INP_TIMEWAIT) != 0) {
 990                                         tw = intotw(inp);
 991                                         if (tw != NULL &&
 992                                             tcp_twrecycleable(tw)) {
 993                                                 INP_LOCK(inp);
 994                                                 tcp_twclose(tw, 0);
 995                                                 match = NULL;
 996                                                 goto retrylookup;
 997                                         }
 998                                 }
 999                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
1000                                         wildcard++;
1001                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
1002                                         if (laddr.s_addr == INADDR_ANY)
1003                                                 wildcard++;
1004                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
1005                                                 continue;
1006                                 } else {
1007                                         if (laddr.s_addr != INADDR_ANY)
1008                                                 wildcard++;
1009                                 }
1010                                 if (wildcard < matchwild) {
1011                                         match = inp;
1012                                         matchwild = wildcard;
1013                                         if (matchwild == 0) {
1014                                                 break;
1015                                         }
1016                                 }
1017                         }
1018                 }
1019                 return (match);
1020         }
1021 }
1022 #undef INP_LOOKUP_MAPPED_PCB_COST
1023
1024 /*
1025  * Lookup PCB in hash list.
1026  */
1027 struct inpcb *
1028 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1029     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int wildcard,
1030     struct ifnet *ifp)
1031 {
1032         struct inpcbhead *head;
1033         struct inpcb *inp;
1034         u_short fport = fport_arg, lport = lport_arg;
1035
1036         INP_INFO_RLOCK_ASSERT(pcbinfo);
1037
1038         /*
1039          * First look for an exact match.
1040          */
1041         head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)];
1042         LIST_FOREACH(inp, head, inp_hash) {
1043 #ifdef INET6
1044                 if ((inp->inp_vflag & INP_IPV4) == 0)
1045                         continue;
1046 #endif
1047                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1048                     inp->inp_laddr.s_addr == laddr.s_addr &&
1049                     inp->inp_fport == fport &&
1050                     inp->inp_lport == lport) {
1051                         /*
1052                          * Found.
1053                          */
1054                         return (inp);
1055                 }
1056         }
1057         if (wildcard) {
1058                 struct inpcb *local_wild = NULL;
1059 #if defined(INET6)
1060                 struct inpcb *local_wild_mapped = NULL;
1061 #endif /* defined(INET6) */
1062
1063                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
1064                 LIST_FOREACH(inp, head, inp_hash) {
1065 #ifdef INET6
1066                         if ((inp->inp_vflag & INP_IPV4) == 0)
1067                                 continue;
1068 #endif
1069                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1070                             inp->inp_lport == lport) {
1071                                 if (ifp && ifp->if_type == IFT_FAITH &&
1072                                     (inp->inp_flags & INP_FAITH) == 0)
1073                                         continue;
1074                                 if (inp->inp_laddr.s_addr == laddr.s_addr)
1075                                         return (inp);
1076                                 else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1077 #if defined(INET6)
1078                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
1079                                                              AF_INET6))
1080                                                 local_wild_mapped = inp;
1081                                         else
1082 #endif /* defined(INET6) */
1083                                         local_wild = inp;
1084                                 }
1085                         }
1086                 }
1087 #if defined(INET6)
1088                 if (local_wild == NULL)
1089                         return (local_wild_mapped);
1090 #endif /* defined(INET6) */
1091                 return (local_wild);
1092         }
1093
1094         /*
1095          * Not found.
1096          */
1097         return (NULL);
1098 }
1099
1100 /*
1101  * Insert PCB onto various hash lists.
1102  */
1103 int
1104 in_pcbinshash(struct inpcb *inp)
1105 {
1106         struct inpcbhead *pcbhash;
1107         struct inpcbporthead *pcbporthash;
1108         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1109         struct inpcbport *phd;
1110         u_int32_t hashkey_faddr;
1111
1112         INP_INFO_WLOCK_ASSERT(pcbinfo);
1113         INP_LOCK_ASSERT(inp);
1114
1115 #ifdef INET6
1116         if (inp->inp_vflag & INP_IPV6)
1117                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1118         else
1119 #endif /* INET6 */
1120         hashkey_faddr = inp->inp_faddr.s_addr;
1121
1122         pcbhash = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
1123                  inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
1124
1125         pcbporthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(inp->inp_lport,
1126             pcbinfo->porthashmask)];
1127
1128         /*
1129          * Go through port list and look for a head for this lport.
1130          */
1131         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1132                 if (phd->phd_port == inp->inp_lport)
1133                         break;
1134         }
1135         /*
1136          * If none exists, malloc one and tack it on.
1137          */
1138         if (phd == NULL) {
1139                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1140                 if (phd == NULL) {
1141                         return (ENOBUFS); /* XXX */
1142                 }
1143                 phd->phd_port = inp->inp_lport;
1144                 LIST_INIT(&phd->phd_pcblist);
1145                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1146         }
1147         inp->inp_phd = phd;
1148         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1149         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1150         return (0);
1151 }
1152
1153 /*
1154  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1155  * changed. NOTE: This does not handle the case of the lport changing (the
1156  * hashed port list would have to be updated as well), so the lport must
1157  * not change after in_pcbinshash() has been called.
1158  */
1159 void
1160 in_pcbrehash(struct inpcb *inp)
1161 {
1162         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1163         struct inpcbhead *head;
1164         u_int32_t hashkey_faddr;
1165
1166         INP_INFO_WLOCK_ASSERT(pcbinfo);
1167         INP_LOCK_ASSERT(inp);
1168
1169 #ifdef INET6
1170         if (inp->inp_vflag & INP_IPV6)
1171                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1172         else
1173 #endif /* INET6 */
1174         hashkey_faddr = inp->inp_faddr.s_addr;
1175
1176         head = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
1177                 inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
1178
1179         LIST_REMOVE(inp, inp_hash);
1180         LIST_INSERT_HEAD(head, inp, inp_hash);
1181 }
1182
1183 /*
1184  * Remove PCB from various lists.
1185  */
1186 void
1187 in_pcbremlists(struct inpcb *inp)
1188 {
1189         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1190
1191         INP_INFO_WLOCK_ASSERT(pcbinfo);
1192         INP_LOCK_ASSERT(inp);
1193
1194         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1195         if (inp->inp_lport) {
1196                 struct inpcbport *phd = inp->inp_phd;
1197
1198                 LIST_REMOVE(inp, inp_hash);
1199                 LIST_REMOVE(inp, inp_portlist);
1200                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1201                         LIST_REMOVE(phd, phd_hash);
1202                         free(phd, M_PCB);
1203                 }
1204         }
1205         LIST_REMOVE(inp, inp_list);
1206         pcbinfo->ipi_count--;
1207 }
1208
1209 /*
1210  * A set label operation has occurred at the socket layer, propagate the
1211  * label change into the in_pcb for the socket.
1212  */
1213 void
1214 in_pcbsosetlabel(struct socket *so)
1215 {
1216 #ifdef MAC
1217         struct inpcb *inp;
1218
1219         inp = sotoinpcb(so);
1220         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
1221
1222         INP_LOCK(inp);
1223         SOCK_LOCK(so);
1224         mac_inpcb_sosetlabel(so, inp);
1225         SOCK_UNLOCK(so);
1226         INP_UNLOCK(inp);
1227 #endif
1228 }
1229
1230 /*
1231  * ipport_tick runs once per second, determining if random port allocation
1232  * should be continued.  If more than ipport_randomcps ports have been
1233  * allocated in the last second, then we return to sequential port
1234  * allocation. We return to random allocation only once we drop below
1235  * ipport_randomcps for at least ipport_randomtime seconds.
1236  */
1237 void
1238 ipport_tick(void *xtp)
1239 {
1240
1241         if (ipport_tcpallocs <= ipport_tcplastcount + ipport_randomcps) {
1242                 if (ipport_stoprandom > 0)
1243                         ipport_stoprandom--;
1244         } else
1245                 ipport_stoprandom = ipport_randomtime;
1246         ipport_tcplastcount = ipport_tcpallocs;
1247         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
1248 }