sys/netinet/in_pcb.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1991, 1993, 1995
   3  *      The Regents of the University of California.
   4  * Copyright (c) 2007 Robert N. M. Watson
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 4. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
  32  * $FreeBSD$
  33  */
  34
  35 #include "opt_ddb.h"
  36 #include "opt_ipsec.h"
  37 #include "opt_inet6.h"
  38 #include "opt_mac.h"
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/malloc.h>
  43 #include <sys/mbuf.h>
  44 #include <sys/domain.h>
  45 #include <sys/protosw.h>
  46 #include <sys/socket.h>
  47 #include <sys/socketvar.h>
  48 #include <sys/priv.h>
  49 #include <sys/proc.h>
  50 #include <sys/jail.h>
  51 #include <sys/kernel.h>
  52 #include <sys/sysctl.h>
  53
  54 #ifdef DDB
  55 #include <ddb/ddb.h>
  56 #endif
  57
  58 #include <vm/uma.h>
  59
  60 #include <net/if.h>
  61 #include <net/if_types.h>
  62 #include <net/route.h>
  63
  64 #include <netinet/in.h>
  65 #include <netinet/in_pcb.h>
  66 #include <netinet/in_var.h>
  67 #include <netinet/ip_var.h>
  68 #include <netinet/tcp_var.h>
  69 #include <netinet/udp.h>
  70 #include <netinet/udp_var.h>
  71 #ifdef INET6
  72 #include <netinet/ip6.h>
  73 #include <netinet6/ip6_var.h>
  74 #endif /* INET6 */
  75
  76
  77 #ifdef IPSEC
  78 #include <netipsec/ipsec.h>
  79 #include <netipsec/key.h>
  80 #endif /* IPSEC */
  81
  82 #include <security/mac/mac_framework.h>
  83
  84 /*
  85  * These configure the range of local port addresses assigned to
  86  * "unspecified" outgoing connections/packets/whatever.
  87  */
  88 int     ipport_lowfirstauto  = IPPORT_RESERVED - 1;     /* 1023 */
  89 int     ipport_lowlastauto = IPPORT_RESERVEDSTART;      /* 600 */
  90 int     ipport_firstauto = IPPORT_HIFIRSTAUTO;          /* 49152 */
  91 int     ipport_lastauto  = IPPORT_HILASTAUTO;           /* 65535 */
  92 int     ipport_hifirstauto = IPPORT_HIFIRSTAUTO;        /* 49152 */
  93 int     ipport_hilastauto  = IPPORT_HILASTAUTO;         /* 65535 */
  94
  95 /*
  96  * Reserved ports accessible only to root. There are significant
  97  * security considerations that must be accounted for when changing these,
  98  * but the security benefits can be great. Please be careful.
  99  */
 100 int     ipport_reservedhigh = IPPORT_RESERVED - 1;      /* 1023 */
 101 int     ipport_reservedlow = 0;
 102
 103 /* Variables dealing with random ephemeral port allocation. */
 104 int     ipport_randomized = 1;  /* user controlled via sysctl */
 105 int     ipport_randomcps = 10;  /* user controlled via sysctl */
 106 int     ipport_randomtime = 45; /* user controlled via sysctl */
 107 int     ipport_stoprandom = 0;  /* toggled by ipport_tick */
 108 int     ipport_tcpallocs;
 109 int     ipport_tcplastcount;
 110
 111 #define RANGECHK(var, min, max) \
 112         if ((var) < (min)) { (var) = (min); } \
 113         else if ((var) > (max)) { (var) = (max); }
 114
 115 static int
 116 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 117 {
 118         int error;
 119
 120         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 121         if (error == 0) {
 122                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 123                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 124                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
 125                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
 126                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
 127                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
 128         }
 129         return (error);
 130 }
 131
 132 #undef RANGECHK
 133
 134 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 135
 136 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
 137            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
 138 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
 139            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
 140 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
 141            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
 142 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
 143            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
 144 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
 145            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
 146 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
 147            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
 148 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
 149            CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedhigh, 0, "");
 150 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
 151            CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedlow, 0, "");
 152 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
 153            &ipport_randomized, 0, "Enable random port allocation");
 154 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
 155            &ipport_randomcps, 0, "Maximum number of random port "
 156            "allocations before switching to a sequental one");
 157 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
 158            &ipport_randomtime, 0, "Minimum time to keep sequental port "
 159            "allocation before switching to a random one");
 160
 161 /*
 162  * in_pcb.c: manage the Protocol Control Blocks.
 163  *
 164  * NOTE: It is assumed that most of these functions will be called with
 165  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
 166  * functions often modify hash chains or addresses in pcbs.
 167  */
 168
 169 /*
 170  * Allocate a PCB and associate it with the socket.
 171  * On success return with the PCB locked.
 172  */
 173 int
 174 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 175 {
 176         struct inpcb *inp;
 177         int error;
 178
 179         INP_INFO_WLOCK_ASSERT(pcbinfo);
 180         error = 0;
 181         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
 182         if (inp == NULL)
 183                 return (ENOBUFS);
 184         bzero(inp, inp_zero_size);
 185         inp->inp_pcbinfo = pcbinfo;
 186         inp->inp_socket = so;
 187 #ifdef MAC
 188         error = mac_init_inpcb(inp, M_NOWAIT);
 189         if (error != 0)
 190                 goto out;
 191         SOCK_LOCK(so);
 192         mac_create_inpcb_from_socket(so, inp);
 193         SOCK_UNLOCK(so);
 194 #endif
 195
 196 #ifdef IPSEC
 197         error = ipsec_init_policy(so, &inp->inp_sp);
 198         if (error != 0)
 199                 goto out;
 200 #endif /*IPSEC*/
 201 #ifdef INET6
 202         if (INP_SOCKAF(so) == AF_INET6) {
 203                 inp->inp_vflag |= INP_IPV6PROTO;
 204                 if (ip6_v6only)
 205                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 206         }
 207 #endif
 208         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
 209         pcbinfo->ipi_count++;
 210         so->so_pcb = (caddr_t)inp;
 211 #ifdef INET6
 212         if (ip6_auto_flowlabel)
 213                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 214 #endif
 215         INP_LOCK(inp);
 216         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 217
 218 #if defined(IPSEC) || defined(MAC)
 219 out:
 220         if (error != 0)
 221                 uma_zfree(pcbinfo->ipi_zone, inp);
 222 #endif
 223         return (error);
 224 }
 225
 226 int
 227 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 228 {
 229         int anonport, error;
 230
 231         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 232         INP_LOCK_ASSERT(inp);
 233
 234         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 235                 return (EINVAL);
 236         anonport = inp->inp_lport == 0 && (nam == NULL ||
 237             ((struct sockaddr_in *)nam)->sin_port == 0);
 238         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 239             &inp->inp_lport, cred);
 240         if (error)
 241                 return (error);
 242         if (in_pcbinshash(inp) != 0) {
 243                 inp->inp_laddr.s_addr = INADDR_ANY;
 244                 inp->inp_lport = 0;
 245                 return (EAGAIN);
 246         }
 247         if (anonport)
 248                 inp->inp_flags |= INP_ANONPORT;
 249         return (0);
 250 }
 251
 252 /*
 253  * Set up a bind operation on a PCB, performing port allocation
 254  * as required, but do not actually modify the PCB. Callers can
 255  * either complete the bind by setting inp_laddr/inp_lport and
 256  * calling in_pcbinshash(), or they can just use the resulting
 257  * port and address to authorise the sending of a once-off packet.
 258  *
 259  * On error, the values of *laddrp and *lportp are not changed.
 260  */
 261 int
 262 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 263     u_short *lportp, struct ucred *cred)
 264 {
 265         struct socket *so = inp->inp_socket;
 266         unsigned short *lastport;
 267         struct sockaddr_in *sin;
 268         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 269         struct in_addr laddr;
 270         u_short lport = 0;
 271         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 272         int error, prison = 0;
 273         int dorandom;
 274
 275         INP_INFO_WLOCK_ASSERT(pcbinfo);
 276         INP_LOCK_ASSERT(inp);
 277
 278         if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
 279                 return (EADDRNOTAVAIL);
 280         laddr.s_addr = *laddrp;
 281         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 282                 return (EINVAL);
 283         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 284                 wild = INPLOOKUP_WILDCARD;
 285         if (nam) {
 286                 sin = (struct sockaddr_in *)nam;
 287                 if (nam->sa_len != sizeof (*sin))
 288                         return (EINVAL);
 289 #ifdef notdef
 290                 /*
 291                  * We should check the family, but old programs
 292                  * incorrectly fail to initialize it.
 293                  */
 294                 if (sin->sin_family != AF_INET)
 295                         return (EAFNOSUPPORT);
 296 #endif
 297                 if (sin->sin_addr.s_addr != INADDR_ANY)
 298                         if (prison_ip(cred, 0, &sin->sin_addr.s_addr))
 299                                 return(EINVAL);
 300                 if (sin->sin_port != *lportp) {
 301                         /* Don't allow the port to change. */
 302                         if (*lportp != 0)
 303                                 return (EINVAL);
 304                         lport = sin->sin_port;
 305                 }
 306                 /* NB: lport is left as 0 if the port isn't being changed. */
 307                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 308                         /*
 309                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 310                          * allow complete duplication of binding if
 311                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 312                          * and a multicast address is bound on both
 313                          * new and duplicated sockets.
 314                          */
 315                         if (so->so_options & SO_REUSEADDR)
 316                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 317                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 318                         sin->sin_port = 0;              /* yech... */
 319                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 320                         if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
 321                                 return (EADDRNOTAVAIL);
 322                 }
 323                 laddr = sin->sin_addr;
 324                 if (lport) {
 325                         struct inpcb *t;
 326                         struct tcptw *tw;
 327
 328                         /* GROSS */
 329                         if (ntohs(lport) <= ipport_reservedhigh &&
 330                             ntohs(lport) >= ipport_reservedlow &&
 331                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 332                             0))
 333                                 return (EACCES);
 334                         if (jailed(cred))
 335                                 prison = 1;
 336                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 337                             priv_check_cred(so->so_cred,
 338                             PRIV_NETINET_REUSEPORT, 0) != 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 #ifdef 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
 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->ipi_lasthi;
 401                 } else if (inp->inp_flags & INP_LOWPORT) {
 402                         error = priv_check_cred(cred,
 403                             PRIV_NETINET_RESERVEDPORT, 0);
 404                         if (error)
 405                                 return error;
 406                         first = ipport_lowfirstauto;    /* 1023 */
 407                         last  = ipport_lowlastauto;     /* 600 */
 408                         lastport = &pcbinfo->ipi_lastlow;
 409                 } else {
 410                         first = ipport_firstauto;       /* sysctl */
 411                         last  = ipport_lastauto;
 412                         lastport = &pcbinfo->ipi_lastport;
 413                 }
 414                 /*
 415                  * For UDP, use random port allocation as long as the user
 416                  * allows it.  For TCP (and as of yet unknown) connections,
 417                  * use random port allocation only if the user allows it AND
 418                  * ipport_tick() allows it.
 419                  */
 420                 if (ipport_randomized &&
 421                         (!ipport_stoprandom || pcbinfo == &udbinfo))
 422                         dorandom = 1;
 423                 else
 424                         dorandom = 0;
 425                 /*
 426                  * It makes no sense to do random port allocation if
 427                  * we have the only port available.
 428                  */
 429                 if (first == last)
 430                         dorandom = 0;
 431                 /* Make sure to not include UDP packets in the count. */
 432                 if (pcbinfo != &udbinfo)
 433                         ipport_tcpallocs++;
 434                 /*
 435                  * Simple check to ensure all ports are not used up causing
 436                  * a deadlock here.
 437                  *
 438                  * We split the two cases (up and down) so that the direction
 439                  * is not being tested on each round of the loop.
 440                  */
 441                 if (first > last) {
 442                         /*
 443                          * counting down
 444                          */
 445                         if (dorandom)
 446                                 *lastport = first -
 447                                             (arc4random() % (first - last));
 448                         count = first - last;
 449
 450                         do {
 451                                 if (count-- < 0)        /* completely used? */
 452                                         return (EADDRNOTAVAIL);
 453                                 --*lastport;
 454                                 if (*lastport > first || *lastport < last)
 455                                         *lastport = first;
 456                                 lport = htons(*lastport);
 457                         } while (in_pcblookup_local(pcbinfo, laddr, lport,
 458                             wild));
 459                 } else {
 460                         /*
 461                          * counting up
 462                          */
 463                         if (dorandom)
 464                                 *lastport = first +
 465                                             (arc4random() % (last - first));
 466                         count = last - first;
 467
 468                         do {
 469                                 if (count-- < 0)        /* completely used? */
 470                                         return (EADDRNOTAVAIL);
 471                                 ++*lastport;
 472                                 if (*lastport < first || *lastport > last)
 473                                         *lastport = first;
 474                                 lport = htons(*lastport);
 475                         } while (in_pcblookup_local(pcbinfo, laddr, lport,
 476                             wild));
 477                 }
 478         }
 479         if (prison_ip(cred, 0, &laddr.s_addr))
 480                 return (EINVAL);
 481         *laddrp = laddr.s_addr;
 482         *lportp = lport;
 483         return (0);
 484 }
 485
 486 /*
 487  * Connect from a socket to a specified address.
 488  * Both address and port must be specified in argument sin.
 489  * If don't have a local address for this socket yet,
 490  * then pick one.
 491  */
 492 int
 493 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 494 {
 495         u_short lport, fport;
 496         in_addr_t laddr, faddr;
 497         int anonport, error;
 498
 499         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 500         INP_LOCK_ASSERT(inp);
 501
 502         lport = inp->inp_lport;
 503         laddr = inp->inp_laddr.s_addr;
 504         anonport = (lport == 0);
 505         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 506             NULL, cred);
 507         if (error)
 508                 return (error);
 509
 510         /* Do the initial binding of the local address if required. */
 511         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 512                 inp->inp_lport = lport;
 513                 inp->inp_laddr.s_addr = laddr;
 514                 if (in_pcbinshash(inp) != 0) {
 515                         inp->inp_laddr.s_addr = INADDR_ANY;
 516                         inp->inp_lport = 0;
 517                         return (EAGAIN);
 518                 }
 519         }
 520
 521         /* Commit the remaining changes. */
 522         inp->inp_lport = lport;
 523         inp->inp_laddr.s_addr = laddr;
 524         inp->inp_faddr.s_addr = faddr;
 525         inp->inp_fport = fport;
 526         in_pcbrehash(inp);
 527
 528         if (anonport)
 529                 inp->inp_flags |= INP_ANONPORT;
 530         return (0);
 531 }
 532
 533 /*
 534  * Set up for a connect from a socket to the specified address.
 535  * On entry, *laddrp and *lportp should contain the current local
 536  * address and port for the PCB; these are updated to the values
 537  * that should be placed in inp_laddr and inp_lport to complete
 538  * the connect.
 539  *
 540  * On success, *faddrp and *fportp will be set to the remote address
 541  * and port. These are not updated in the error case.
 542  *
 543  * If the operation fails because the connection already exists,
 544  * *oinpp will be set to the PCB of that connection so that the
 545  * caller can decide to override it. In all other cases, *oinpp
 546  * is set to NULL.
 547  */
 548 int
 549 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 550     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 551     struct inpcb **oinpp, struct ucred *cred)
 552 {
 553         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 554         struct in_ifaddr *ia;
 555         struct sockaddr_in sa;
 556         struct ucred *socred;
 557         struct inpcb *oinp;
 558         struct in_addr laddr, faddr;
 559         u_short lport, fport;
 560         int error;
 561
 562         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 563         INP_LOCK_ASSERT(inp);
 564
 565         if (oinpp != NULL)
 566                 *oinpp = NULL;
 567         if (nam->sa_len != sizeof (*sin))
 568                 return (EINVAL);
 569         if (sin->sin_family != AF_INET)
 570                 return (EAFNOSUPPORT);
 571         if (sin->sin_port == 0)
 572                 return (EADDRNOTAVAIL);
 573         laddr.s_addr = *laddrp;
 574         lport = *lportp;
 575         faddr = sin->sin_addr;
 576         fport = sin->sin_port;
 577         socred = inp->inp_socket->so_cred;
 578         if (laddr.s_addr == INADDR_ANY && jailed(socred)) {
 579                 bzero(&sa, sizeof(sa));
 580                 sa.sin_addr.s_addr = htonl(prison_getip(socred));
 581                 sa.sin_len = sizeof(sa);
 582                 sa.sin_family = AF_INET;
 583                 error = in_pcbbind_setup(inp, (struct sockaddr *)&sa,
 584                     &laddr.s_addr, &lport, cred);
 585                 if (error)
 586                         return (error);
 587         }
 588         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 589                 /*
 590                  * If the destination address is INADDR_ANY,
 591                  * use the primary local address.
 592                  * If the supplied address is INADDR_BROADCAST,
 593                  * and the primary interface supports broadcast,
 594                  * choose the broadcast address for that interface.
 595                  */
 596                 if (faddr.s_addr == INADDR_ANY)
 597                         faddr = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr;
 598                 else if (faddr.s_addr == (u_long)INADDR_BROADCAST &&
 599                     (TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags &
 600                     IFF_BROADCAST))
 601                         faddr = satosin(&TAILQ_FIRST(
 602                             &in_ifaddrhead)->ia_broadaddr)->sin_addr;
 603         }
 604         if (laddr.s_addr == INADDR_ANY) {
 605                 ia = (struct in_ifaddr *)0;
 606                 /*
 607                  * If route is known our src addr is taken from the i/f,
 608                  * else punt.
 609                  *
 610                  * Find out route to destination
 611                  */
 612                 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 613                         ia = ip_rtaddr(faddr);
 614                 /*
 615                  * If we found a route, use the address corresponding to
 616                  * the outgoing interface.
 617                  *
 618                  * Otherwise assume faddr is reachable on a directly connected
 619                  * network and try to find a corresponding interface to take
 620                  * the source address from.
 621                  */
 622                 if (ia == 0) {
 623                         bzero(&sa, sizeof(sa));
 624                         sa.sin_addr = faddr;
 625                         sa.sin_len = sizeof(sa);
 626                         sa.sin_family = AF_INET;
 627
 628                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sa)));
 629                         if (ia == 0)
 630                                 ia = ifatoia(ifa_ifwithnet(sintosa(&sa)));
 631                         if (ia == 0)
 632                                 return (ENETUNREACH);
 633                 }
 634                 /*
 635                  * If the destination address is multicast and an outgoing
 636                  * interface has been set as a multicast option, use the
 637                  * address of that interface as our source address.
 638                  */
 639                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
 640                     inp->inp_moptions != NULL) {
 641                         struct ip_moptions *imo;
 642                         struct ifnet *ifp;
 643
 644                         imo = inp->inp_moptions;
 645                         if (imo->imo_multicast_ifp != NULL) {
 646                                 ifp = imo->imo_multicast_ifp;
 647                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
 648                                         if (ia->ia_ifp == ifp)
 649                                                 break;
 650                                 if (ia == 0)
 651                                         return (EADDRNOTAVAIL);
 652                         }
 653                 }
 654                 laddr = ia->ia_addr.sin_addr;
 655         }
 656
 657         oinp = in_pcblookup_hash(inp->inp_pcbinfo, faddr, fport, laddr, lport,
 658             0, NULL);
 659         if (oinp != NULL) {
 660                 if (oinpp != NULL)
 661                         *oinpp = oinp;
 662                 return (EADDRINUSE);
 663         }
 664         if (lport == 0) {
 665                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
 666                     cred);
 667                 if (error)
 668                         return (error);
 669         }
 670         *laddrp = laddr.s_addr;
 671         *lportp = lport;
 672         *faddrp = faddr.s_addr;
 673         *fportp = fport;
 674         return (0);
 675 }
 676
 677 void
 678 in_pcbdisconnect(struct inpcb *inp)
 679 {
 680
 681         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 682         INP_LOCK_ASSERT(inp);
 683
 684         inp->inp_faddr.s_addr = INADDR_ANY;
 685         inp->inp_fport = 0;
 686         in_pcbrehash(inp);
 687 }
 688
 689 /*
 690  * In the old world order, in_pcbdetach() served two functions: to detach the
 691  * pcb from the socket/potentially free the socket, and to free the pcb
 692  * itself.  In the new world order, the protocol code is responsible for
 693  * managing the relationship with the socket, and this code simply frees the
 694  * pcb.
 695  */
 696 void
 697 in_pcbdetach(struct inpcb *inp)
 698 {
 699
 700         KASSERT(inp->inp_socket != NULL, ("in_pcbdetach: inp_socket == NULL"));
 701         inp->inp_socket->so_pcb = NULL;
 702         inp->inp_socket = NULL;
 703 }
 704
 705 void
 706 in_pcbfree(struct inpcb *inp)
 707 {
 708         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 709
 710         KASSERT(inp->inp_socket == NULL, ("in_pcbfree: inp_socket != NULL"));
 711         INP_INFO_WLOCK_ASSERT(ipi);
 712         INP_LOCK_ASSERT(inp);
 713
 714 #ifdef IPSEC
 715         ipsec4_delete_pcbpolicy(inp);
 716 #endif /*IPSEC*/
 717         inp->inp_gencnt = ++ipi->ipi_gencnt;
 718         in_pcbremlists(inp);
 719         if (inp->inp_options)
 720                 (void)m_free(inp->inp_options);
 721         if (inp->inp_moptions != NULL)
 722                 inp_freemoptions(inp->inp_moptions);
 723         inp->inp_vflag = 0;
 724
 725 #ifdef MAC
 726         mac_destroy_inpcb(inp);
 727 #endif
 728         INP_UNLOCK(inp);
 729         uma_zfree(ipi->ipi_zone, inp);
 730 }
 731
 732 /*
 733  * TCP needs to maintain its inpcb structure after the TCP connection has
 734  * been torn down.  However, it must be disconnected from the inpcb hashes as
 735  * it must not prevent binding of future connections to the same port/ip
 736  * combination by other inpcbs.
 737  */
 738 void
 739 in_pcbdrop(struct inpcb *inp)
 740 {
 741
 742         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 743         INP_LOCK_ASSERT(inp);
 744
 745         inp->inp_vflag |= INP_DROPPED;
 746         if (inp->inp_lport) {
 747                 struct inpcbport *phd = inp->inp_phd;
 748
 749                 LIST_REMOVE(inp, inp_hash);
 750                 LIST_REMOVE(inp, inp_portlist);
 751                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 752                         LIST_REMOVE(phd, phd_hash);
 753                         free(phd, M_PCB);
 754                 }
 755                 inp->inp_lport = 0;
 756         }
 757 }
 758
 759 /*
 760  * Common routines to return the socket addresses associated with inpcbs.
 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 int
 778 in_getsockaddr(struct socket *so, struct sockaddr **nam)
 779 {
 780         struct inpcb *inp;
 781         struct in_addr addr;
 782         in_port_t port;
 783
 784         inp = sotoinpcb(so);
 785         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
 786
 787         INP_LOCK(inp);
 788         port = inp->inp_lport;
 789         addr = inp->inp_laddr;
 790         INP_UNLOCK(inp);
 791
 792         *nam = in_sockaddr(port, &addr);
 793         return 0;
 794 }
 795
 796 int
 797 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
 798 {
 799         struct inpcb *inp;
 800         struct in_addr addr;
 801         in_port_t port;
 802
 803         inp = sotoinpcb(so);
 804         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
 805
 806         INP_LOCK(inp);
 807         port = inp->inp_fport;
 808         addr = inp->inp_faddr;
 809         INP_UNLOCK(inp);
 810
 811         *nam = in_sockaddr(port, &addr);
 812         return 0;
 813 }
 814
 815 void
 816 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
 817     struct inpcb *(*notify)(struct inpcb *, int))
 818 {
 819         struct inpcb *inp, *ninp;
 820         struct inpcbhead *head;
 821
 822         INP_INFO_WLOCK(pcbinfo);
 823         head = pcbinfo->ipi_listhead;
 824         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 825                 INP_LOCK(inp);
 826                 ninp = LIST_NEXT(inp, inp_list);
 827 #ifdef INET6
 828                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 829                         INP_UNLOCK(inp);
 830                         continue;
 831                 }
 832 #endif
 833                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 834                     inp->inp_socket == NULL) {
 835                         INP_UNLOCK(inp);
 836                         continue;
 837                 }
 838                 if ((*notify)(inp, errno))
 839                         INP_UNLOCK(inp);
 840         }
 841         INP_INFO_WUNLOCK(pcbinfo);
 842 }
 843
 844 void
 845 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 846 {
 847         struct inpcb *inp;
 848         struct ip_moptions *imo;
 849         int i, gap;
 850
 851         INP_INFO_RLOCK(pcbinfo);
 852         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
 853                 INP_LOCK(inp);
 854                 imo = inp->inp_moptions;
 855                 if ((inp->inp_vflag & INP_IPV4) &&
 856                     imo != NULL) {
 857                         /*
 858                          * Unselect the outgoing interface if it is being
 859                          * detached.
 860                          */
 861                         if (imo->imo_multicast_ifp == ifp)
 862                                 imo->imo_multicast_ifp = NULL;
 863
 864                         /*
 865                          * Drop multicast group membership if we joined
 866                          * through the interface being detached.
 867                          */
 868                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 869                             i++) {
 870                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 871                                         in_delmulti(imo->imo_membership[i]);
 872                                         gap++;
 873                                 } else if (gap != 0)
 874                                         imo->imo_membership[i - gap] =
 875                                             imo->imo_membership[i];
 876                         }
 877                         imo->imo_num_memberships -= gap;
 878                 }
 879                 INP_UNLOCK(inp);
 880         }
 881         INP_INFO_RUNLOCK(pcbinfo);
 882 }
 883
 884 /*
 885  * Lookup a PCB based on the local address and port.
 886  */
 887 #define INP_LOOKUP_MAPPED_PCB_COST      3
 888 struct inpcb *
 889 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 890     u_int lport_arg, int wild_okay)
 891 {
 892         struct inpcb *inp;
 893 #ifdef INET6
 894         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
 895 #else
 896         int matchwild = 3;
 897 #endif
 898         int wildcard;
 899         u_short lport = lport_arg;
 900
 901         INP_INFO_WLOCK_ASSERT(pcbinfo);
 902
 903         if (!wild_okay) {
 904                 struct inpcbhead *head;
 905                 /*
 906                  * Look for an unconnected (wildcard foreign addr) PCB that
 907                  * matches the local address and port we're looking for.
 908                  */
 909                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 910                     0, pcbinfo->ipi_hashmask)];
 911                 LIST_FOREACH(inp, head, inp_hash) {
 912 #ifdef INET6
 913                         if ((inp->inp_vflag & INP_IPV4) == 0)
 914                                 continue;
 915 #endif
 916                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 917                             inp->inp_laddr.s_addr == laddr.s_addr &&
 918                             inp->inp_lport == lport) {
 919                                 /*
 920                                  * Found.
 921                                  */
 922                                 return (inp);
 923                         }
 924                 }
 925                 /*
 926                  * Not found.
 927                  */
 928                 return (NULL);
 929         } else {
 930                 struct inpcbporthead *porthash;
 931                 struct inpcbport *phd;
 932                 struct inpcb *match = NULL;
 933                 /*
 934                  * Best fit PCB lookup.
 935                  *
 936                  * First see if this local port is in use by looking on the
 937                  * port hash list.
 938                  */
 939                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 940                     pcbinfo->ipi_porthashmask)];
 941                 LIST_FOREACH(phd, porthash, phd_hash) {
 942                         if (phd->phd_port == lport)
 943                                 break;
 944                 }
 945                 if (phd != NULL) {
 946                         /*
 947                          * Port is in use by one or more PCBs. Look for best
 948                          * fit.
 949                          */
 950                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 951                                 wildcard = 0;
 952 #ifdef INET6
 953                                 if ((inp->inp_vflag & INP_IPV4) == 0)
 954                                         continue;
 955                                 /*
 956                                  * We never select the PCB that has
 957                                  * INP_IPV6 flag and is bound to :: if
 958                                  * we have another PCB which is bound
 959                                  * to 0.0.0.0.  If a PCB has the
 960                                  * INP_IPV6 flag, then we set its cost
 961                                  * higher than IPv4 only PCBs.
 962                                  *
 963                                  * Note that the case only happens
 964                                  * when a socket is bound to ::, under
 965                                  * the condition that the use of the
 966                                  * mapped address is allowed.
 967                                  */
 968                                 if ((inp->inp_vflag & INP_IPV6) != 0)
 969                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
 970 #endif
 971                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
 972                                         wildcard++;
 973                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
 974                                         if (laddr.s_addr == INADDR_ANY)
 975                                                 wildcard++;
 976                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
 977                                                 continue;
 978                                 } else {
 979                                         if (laddr.s_addr != INADDR_ANY)
 980                                                 wildcard++;
 981                                 }
 982                                 if (wildcard < matchwild) {
 983                                         match = inp;
 984                                         matchwild = wildcard;
 985                                         if (matchwild == 0) {
 986                                                 break;
 987                                         }
 988                                 }
 989                         }
 990                 }
 991                 return (match);
 992         }
 993 }
 994 #undef INP_LOOKUP_MAPPED_PCB_COST
 995
 996 /*
 997  * Lookup PCB in hash list.
 998  */
 999 struct inpcb *
1000 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1001     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int wildcard,
1002     struct ifnet *ifp)
1003 {
1004         struct inpcbhead *head;
1005         struct inpcb *inp;
1006         u_short fport = fport_arg, lport = lport_arg;
1007
1008         INP_INFO_RLOCK_ASSERT(pcbinfo);
1009
1010         /*
1011          * First look for an exact match.
1012          */
1013         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1014             pcbinfo->ipi_hashmask)];
1015         LIST_FOREACH(inp, head, inp_hash) {
1016 #ifdef INET6
1017                 if ((inp->inp_vflag & INP_IPV4) == 0)
1018                         continue;
1019 #endif
1020                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1021                     inp->inp_laddr.s_addr == laddr.s_addr &&
1022                     inp->inp_fport == fport &&
1023                     inp->inp_lport == lport)
1024                         return (inp);
1025         }
1026
1027         /*
1028          * Then look for a wildcard match, if requested.
1029          */
1030         if (wildcard) {
1031                 struct inpcb *local_wild = NULL;
1032 #ifdef INET6
1033                 struct inpcb *local_wild_mapped = NULL;
1034 #endif
1035
1036                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1037                     0, pcbinfo->ipi_hashmask)];
1038                 LIST_FOREACH(inp, head, inp_hash) {
1039 #ifdef INET6
1040                         if ((inp->inp_vflag & INP_IPV4) == 0)
1041                                 continue;
1042 #endif
1043                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1044                             inp->inp_lport == lport) {
1045                                 if (ifp && ifp->if_type == IFT_FAITH &&
1046                                     (inp->inp_flags & INP_FAITH) == 0)
1047                                         continue;
1048                                 if (inp->inp_laddr.s_addr == laddr.s_addr)
1049                                         return (inp);
1050                                 else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1051 #ifdef INET6
1052                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
1053                                                              AF_INET6))
1054                                                 local_wild_mapped = inp;
1055                                         else
1056 #endif
1057                                                 local_wild = inp;
1058                                 }
1059                         }
1060                 }
1061 #ifdef INET6
1062                 if (local_wild == NULL)
1063                         return (local_wild_mapped);
1064 #endif
1065                 return (local_wild);
1066         }
1067         return (NULL);
1068 }
1069
1070 /*
1071  * Insert PCB onto various hash lists.
1072  */
1073 int
1074 in_pcbinshash(struct inpcb *inp)
1075 {
1076         struct inpcbhead *pcbhash;
1077         struct inpcbporthead *pcbporthash;
1078         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1079         struct inpcbport *phd;
1080         u_int32_t hashkey_faddr;
1081
1082         INP_INFO_WLOCK_ASSERT(pcbinfo);
1083         INP_LOCK_ASSERT(inp);
1084
1085 #ifdef INET6
1086         if (inp->inp_vflag & INP_IPV6)
1087                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1088         else
1089 #endif /* INET6 */
1090         hashkey_faddr = inp->inp_faddr.s_addr;
1091
1092         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1093                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1094
1095         pcbporthash = &pcbinfo->ipi_porthashbase[
1096             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
1097
1098         /*
1099          * Go through port list and look for a head for this lport.
1100          */
1101         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1102                 if (phd->phd_port == inp->inp_lport)
1103                         break;
1104         }
1105         /*
1106          * If none exists, malloc one and tack it on.
1107          */
1108         if (phd == NULL) {
1109                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1110                 if (phd == NULL) {
1111                         return (ENOBUFS); /* XXX */
1112                 }
1113                 phd->phd_port = inp->inp_lport;
1114                 LIST_INIT(&phd->phd_pcblist);
1115                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1116         }
1117         inp->inp_phd = phd;
1118         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1119         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1120         return (0);
1121 }
1122
1123 /*
1124  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1125  * changed. NOTE: This does not handle the case of the lport changing (the
1126  * hashed port list would have to be updated as well), so the lport must
1127  * not change after in_pcbinshash() has been called.
1128  */
1129 void
1130 in_pcbrehash(struct inpcb *inp)
1131 {
1132         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1133         struct inpcbhead *head;
1134         u_int32_t hashkey_faddr;
1135
1136         INP_INFO_WLOCK_ASSERT(pcbinfo);
1137         INP_LOCK_ASSERT(inp);
1138
1139 #ifdef INET6
1140         if (inp->inp_vflag & INP_IPV6)
1141                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1142         else
1143 #endif /* INET6 */
1144         hashkey_faddr = inp->inp_faddr.s_addr;
1145
1146         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1147                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1148
1149         LIST_REMOVE(inp, inp_hash);
1150         LIST_INSERT_HEAD(head, inp, inp_hash);
1151 }
1152
1153 /*
1154  * Remove PCB from various lists.
1155  */
1156 void
1157 in_pcbremlists(struct inpcb *inp)
1158 {
1159         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1160
1161         INP_INFO_WLOCK_ASSERT(pcbinfo);
1162         INP_LOCK_ASSERT(inp);
1163
1164         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1165         if (inp->inp_lport) {
1166                 struct inpcbport *phd = inp->inp_phd;
1167
1168                 LIST_REMOVE(inp, inp_hash);
1169                 LIST_REMOVE(inp, inp_portlist);
1170                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1171                         LIST_REMOVE(phd, phd_hash);
1172                         free(phd, M_PCB);
1173                 }
1174         }
1175         LIST_REMOVE(inp, inp_list);
1176         pcbinfo->ipi_count--;
1177 }
1178
1179 /*
1180  * A set label operation has occurred at the socket layer, propagate the
1181  * label change into the in_pcb for the socket.
1182  */
1183 void
1184 in_pcbsosetlabel(struct socket *so)
1185 {
1186 #ifdef MAC
1187         struct inpcb *inp;
1188
1189         inp = sotoinpcb(so);
1190         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
1191
1192         INP_LOCK(inp);
1193         SOCK_LOCK(so);
1194         mac_inpcb_sosetlabel(so, inp);
1195         SOCK_UNLOCK(so);
1196         INP_UNLOCK(inp);
1197 #endif
1198 }
1199
1200 /*
1201  * ipport_tick runs once per second, determining if random port allocation
1202  * should be continued.  If more than ipport_randomcps ports have been
1203  * allocated in the last second, then we return to sequential port
1204  * allocation. We return to random allocation only once we drop below
1205  * ipport_randomcps for at least ipport_randomtime seconds.
1206  */
1207 void
1208 ipport_tick(void *xtp)
1209 {
1210
1211         if (ipport_tcpallocs <= ipport_tcplastcount + ipport_randomcps) {
1212                 if (ipport_stoprandom > 0)
1213                         ipport_stoprandom--;
1214         } else
1215                 ipport_stoprandom = ipport_randomtime;
1216         ipport_tcplastcount = ipport_tcpallocs;
1217         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
1218 }
1219
1220 #ifdef DDB
1221 static void
1222 db_print_indent(int indent)
1223 {
1224         int i;
1225
1226         for (i = 0; i < indent; i++)
1227                 db_printf(" ");
1228 }
1229
1230 static void
1231 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
1232 {
1233         char faddr_str[48], laddr_str[48];
1234
1235         db_print_indent(indent);
1236         db_printf("%s at %p\n", name, inc);
1237
1238         indent += 2;
1239
1240 #ifdef INET6
1241         if (inc->inc_flags == 1) {
1242                 /* IPv6. */
1243                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
1244                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
1245         } else {
1246 #endif
1247                 /* IPv4. */
1248                 inet_ntoa_r(inc->inc_laddr, laddr_str);
1249                 inet_ntoa_r(inc->inc_faddr, faddr_str);
1250 #ifdef INET6
1251         }
1252 #endif
1253         db_print_indent(indent);
1254         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
1255             ntohs(inc->inc_lport));
1256         db_print_indent(indent);
1257         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
1258             ntohs(inc->inc_fport));
1259 }
1260
1261 static void
1262 db_print_inpflags(int inp_flags)
1263 {
1264         int comma;
1265
1266         comma = 0;
1267         if (inp_flags & INP_RECVOPTS) {
1268                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
1269                 comma = 1;
1270         }
1271         if (inp_flags & INP_RECVRETOPTS) {
1272                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
1273                 comma = 1;
1274         }
1275         if (inp_flags & INP_RECVDSTADDR) {
1276                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
1277                 comma = 1;
1278         }
1279         if (inp_flags & INP_HDRINCL) {
1280                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
1281                 comma = 1;
1282         }
1283         if (inp_flags & INP_HIGHPORT) {
1284                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
1285                 comma = 1;
1286         }
1287         if (inp_flags & INP_LOWPORT) {
1288                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
1289                 comma = 1;
1290         }
1291         if (inp_flags & INP_ANONPORT) {
1292                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
1293                 comma = 1;
1294         }
1295         if (inp_flags & INP_RECVIF) {
1296                 db_printf("%sINP_RECVIF", comma ? ", " : "");
1297                 comma = 1;
1298         }
1299         if (inp_flags & INP_MTUDISC) {
1300                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
1301                 comma = 1;
1302         }
1303         if (inp_flags & INP_FAITH) {
1304                 db_printf("%sINP_FAITH", comma ? ", " : "");
1305                 comma = 1;
1306         }
1307         if (inp_flags & INP_RECVTTL) {
1308                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
1309                 comma = 1;
1310         }
1311         if (inp_flags & INP_DONTFRAG) {
1312                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
1313                 comma = 1;
1314         }
1315         if (inp_flags & IN6P_IPV6_V6ONLY) {
1316                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
1317                 comma = 1;
1318         }
1319         if (inp_flags & IN6P_PKTINFO) {
1320                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
1321                 comma = 1;
1322         }
1323         if (inp_flags & IN6P_HOPLIMIT) {
1324                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
1325                 comma = 1;
1326         }
1327         if (inp_flags & IN6P_HOPOPTS) {
1328                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
1329                 comma = 1;
1330         }
1331         if (inp_flags & IN6P_DSTOPTS) {
1332                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
1333                 comma = 1;
1334         }
1335         if (inp_flags & IN6P_RTHDR) {
1336                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
1337                 comma = 1;
1338         }
1339         if (inp_flags & IN6P_RTHDRDSTOPTS) {
1340                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
1341                 comma = 1;
1342         }
1343         if (inp_flags & IN6P_TCLASS) {
1344                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
1345                 comma = 1;
1346         }
1347         if (inp_flags & IN6P_AUTOFLOWLABEL) {
1348                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
1349                 comma = 1;
1350         }
1351         if (inp_flags & IN6P_RFC2292) {
1352                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
1353                 comma = 1;
1354         }
1355         if (inp_flags & IN6P_MTU) {
1356                 db_printf("IN6P_MTU%s", comma ? ", " : "");
1357                 comma = 1;
1358         }
1359 }
1360
1361 static void
1362 db_print_inpvflag(u_char inp_vflag)
1363 {
1364         int comma;
1365
1366         comma = 0;
1367         if (inp_vflag & INP_IPV4) {
1368                 db_printf("%sINP_IPV4", comma ? ", " : "");
1369                 comma  = 1;
1370         }
1371         if (inp_vflag & INP_IPV6) {
1372                 db_printf("%sINP_IPV6", comma ? ", " : "");
1373                 comma  = 1;
1374         }
1375         if (inp_vflag & INP_IPV6PROTO) {
1376                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
1377                 comma  = 1;
1378         }
1379         if (inp_vflag & INP_TIMEWAIT) {
1380                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
1381                 comma  = 1;
1382         }
1383         if (inp_vflag & INP_ONESBCAST) {
1384                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
1385                 comma  = 1;
1386         }
1387         if (inp_vflag & INP_DROPPED) {
1388                 db_printf("%sINP_DROPPED", comma ? ", " : "");
1389                 comma  = 1;
1390         }
1391         if (inp_vflag & INP_SOCKREF) {
1392                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
1393                 comma  = 1;
1394         }
1395 }
1396
1397 void
1398 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
1399 {
1400
1401         db_print_indent(indent);
1402         db_printf("%s at %p\n", name, inp);
1403
1404         indent += 2;
1405
1406         db_print_indent(indent);
1407         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
1408
1409         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
1410
1411         db_print_indent(indent);
1412         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
1413             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
1414
1415         db_print_indent(indent);
1416         db_printf("inp_label: %p   inp_flags: 0x%x (",
1417            inp->inp_label, inp->inp_flags);
1418         db_print_inpflags(inp->inp_flags);
1419         db_printf(")\n");
1420
1421         db_print_indent(indent);
1422         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
1423             inp->inp_vflag);
1424         db_print_inpvflag(inp->inp_vflag);
1425         db_printf(")\n");
1426
1427         db_print_indent(indent);
1428         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
1429             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
1430
1431         db_print_indent(indent);
1432 #ifdef INET6
1433         if (inp->inp_vflag & INP_IPV6) {
1434                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
1435                     "in6p_moptions: %p\n", inp->in6p_options,
1436                     inp->in6p_outputopts, inp->in6p_moptions);
1437                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
1438                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
1439                     inp->in6p_hops);
1440         } else
1441 #endif
1442         {
1443                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
1444                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
1445                     inp->inp_options, inp->inp_moptions);
1446         }
1447
1448         db_print_indent(indent);
1449         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
1450             (uintmax_t)inp->inp_gencnt);
1451 }
1452
1453 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
1454 {
1455         struct inpcb *inp;
1456
1457         if (!have_addr) {
1458                 db_printf("usage: show inpcb <addr>\n");
1459                 return;
1460         }
1461         inp = (struct inpcb *)addr;
1462
1463         db_print_inpcb(inp, "inpcb", 0);
1464 }
1465 #endif