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