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  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include "opt_ddb.h"
  38 #include "opt_ipsec.h"
  39 #include "opt_inet6.h"
  40 #include "opt_mac.h"
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/malloc.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/domain.h>
  47 #include <sys/protosw.h>
  48 #include <sys/socket.h>
  49 #include <sys/socketvar.h>
  50 #include <sys/priv.h>
  51 #include <sys/proc.h>
  52 #include <sys/jail.h>
  53 #include <sys/kernel.h>
  54 #include <sys/sysctl.h>
  55
  56 #ifdef DDB
  57 #include <ddb/ddb.h>
  58 #endif
  59
  60 #include <vm/uma.h>
  61
  62 #include <net/if.h>
  63 #include <net/if_types.h>
  64 #include <net/route.h>
  65
  66 #include <netinet/in.h>
  67 #include <netinet/in_pcb.h>
  68 #include <netinet/in_var.h>
  69 #include <netinet/ip_var.h>
  70 #include <netinet/tcp_var.h>
  71 #include <netinet/udp.h>
  72 #include <netinet/udp_var.h>
  73 #ifdef INET6
  74 #include <netinet/ip6.h>
  75 #include <netinet6/ip6_var.h>
  76 #endif /* INET6 */
  77
  78
  79 #ifdef IPSEC
  80 #include <netipsec/ipsec.h>
  81 #include <netipsec/key.h>
  82 #endif /* IPSEC */
  83
  84 #include <security/mac/mac_framework.h>
  85
  86 /*
  87  * These configure the range of local port addresses assigned to
  88  * "unspecified" outgoing connections/packets/whatever.
  89  */
  90 int     ipport_lowfirstauto  = IPPORT_RESERVED - 1;     /* 1023 */
  91 int     ipport_lowlastauto = IPPORT_RESERVEDSTART;      /* 600 */
  92 int     ipport_firstauto = IPPORT_HIFIRSTAUTO;          /* 49152 */
  93 int     ipport_lastauto  = IPPORT_HILASTAUTO;           /* 65535 */
  94 int     ipport_hifirstauto = IPPORT_HIFIRSTAUTO;        /* 49152 */
  95 int     ipport_hilastauto  = IPPORT_HILASTAUTO;         /* 65535 */
  96
  97 /*
  98  * Reserved ports accessible only to root. There are significant
  99  * security considerations that must be accounted for when changing these,
 100  * but the security benefits can be great. Please be careful.
 101  */
 102 int     ipport_reservedhigh = IPPORT_RESERVED - 1;      /* 1023 */
 103 int     ipport_reservedlow = 0;
 104
 105 /* Variables dealing with random ephemeral port allocation. */
 106 int     ipport_randomized = 1;  /* user controlled via sysctl */
 107 int     ipport_randomcps = 10;  /* user controlled via sysctl */
 108 int     ipport_randomtime = 45; /* user controlled via sysctl */
 109 int     ipport_stoprandom = 0;  /* toggled by ipport_tick */
 110 int     ipport_tcpallocs;
 111 int     ipport_tcplastcount;
 112
 113 #define RANGECHK(var, min, max) \
 114         if ((var) < (min)) { (var) = (min); } \
 115         else if ((var) > (max)) { (var) = (max); }
 116
 117 static int
 118 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 119 {
 120         int error;
 121
 122         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 123         if (error == 0) {
 124                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 125                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 126                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
 127                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
 128                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
 129                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
 130         }
 131         return (error);
 132 }
 133
 134 #undef RANGECHK
 135
 136 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 137
 138 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
 139            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
 140 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
 141            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
 142 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
 143            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
 144 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
 145            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
 146 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
 147            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
 148 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
 149            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
 150 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
 151            CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedhigh, 0, "");
 152 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
 153            CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedlow, 0, "");
 154 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
 155            &ipport_randomized, 0, "Enable random port allocation");
 156 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
 157            &ipport_randomcps, 0, "Maximum number of random port "
 158            "allocations before switching to a sequental one");
 159 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
 160            &ipport_randomtime, 0, "Minimum time to keep sequental port "
 161            "allocation before switching to a random one");
 162
 163 /*
 164  * in_pcb.c: manage the Protocol Control Blocks.
 165  *
 166  * NOTE: It is assumed that most of these functions will be called with
 167  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
 168  * functions often modify hash chains or addresses in pcbs.
 169  */
 170
 171 /*
 172  * Allocate a PCB and associate it with the socket.
 173  * On success return with the PCB locked.
 174  */
 175 int
 176 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 177 {
 178         struct inpcb *inp;
 179         int error;
 180
 181         INP_INFO_WLOCK_ASSERT(pcbinfo);
 182         error = 0;
 183         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
 184         if (inp == NULL)
 185                 return (ENOBUFS);
 186         bzero(inp, inp_zero_size);
 187         inp->inp_pcbinfo = pcbinfo;
 188         inp->inp_socket = so;
 189 #ifdef MAC
 190         error = mac_inpcb_init(inp, M_NOWAIT);
 191         if (error != 0)
 192                 goto out;
 193         SOCK_LOCK(so);
 194         mac_inpcb_create(so, inp);
 195         SOCK_UNLOCK(so);
 196 #endif
 197
 198 #ifdef IPSEC
 199         error = ipsec_init_policy(so, &inp->inp_sp);
 200         if (error != 0)
 201                 goto out;
 202 #endif /*IPSEC*/
 203 #ifdef INET6
 204         if (INP_SOCKAF(so) == AF_INET6) {
 205                 inp->inp_vflag |= INP_IPV6PROTO;
 206                 if (ip6_v6only)
 207                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 208         }
 209 #endif
 210         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
 211         pcbinfo->ipi_count++;
 212         so->so_pcb = (caddr_t)inp;
 213 #ifdef INET6
 214         if (ip6_auto_flowlabel)
 215                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 216 #endif
 217         INP_LOCK(inp);
 218         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 219
 220 #if defined(IPSEC) || defined(MAC)
 221 out:
 222         if (error != 0)
 223                 uma_zfree(pcbinfo->ipi_zone, inp);
 224 #endif
 225         return (error);
 226 }
 227
 228 int
 229 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 230 {
 231         int anonport, error;
 232
 233         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 234         INP_LOCK_ASSERT(inp);
 235
 236         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 237                 return (EINVAL);
 238         anonport = inp->inp_lport == 0 && (nam == NULL ||
 239             ((struct sockaddr_in *)nam)->sin_port == 0);
 240         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 241             &inp->inp_lport, cred);
 242         if (error)
 243                 return (error);
 244         if (in_pcbinshash(inp) != 0) {
 245                 inp->inp_laddr.s_addr = INADDR_ANY;
 246                 inp->inp_lport = 0;
 247                 return (EAGAIN);
 248         }
 249         if (anonport)
 250                 inp->inp_flags |= INP_ANONPORT;
 251         return (0);
 252 }
 253
 254 /*
 255  * Set up a bind operation on a PCB, performing port allocation
 256  * as required, but do not actually modify the PCB. Callers can
 257  * either complete the bind by setting inp_laddr/inp_lport and
 258  * calling in_pcbinshash(), or they can just use the resulting
 259  * port and address to authorise the sending of a once-off packet.
 260  *
 261  * On error, the values of *laddrp and *lportp are not changed.
 262  */
 263 int
 264 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 265     u_short *lportp, struct ucred *cred)
 266 {
 267         struct socket *so = inp->inp_socket;
 268         unsigned short *lastport;
 269         struct sockaddr_in *sin;
 270         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 271         struct in_addr laddr;
 272         u_short lport = 0;
 273         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 274         int error, prison = 0;
 275         int dorandom;
 276
 277         INP_INFO_WLOCK_ASSERT(pcbinfo);
 278         INP_LOCK_ASSERT(inp);
 279
 280         if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
 281                 return (EADDRNOTAVAIL);
 282         laddr.s_addr = *laddrp;
 283         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 284                 return (EINVAL);
 285         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 286                 wild = INPLOOKUP_WILDCARD;
 287         if (nam) {
 288                 sin = (struct sockaddr_in *)nam;
 289                 if (nam->sa_len != sizeof (*sin))
 290                         return (EINVAL);
 291 #ifdef notdef
 292                 /*
 293                  * We should check the family, but old programs
 294                  * incorrectly fail to initialize it.
 295                  */
 296                 if (sin->sin_family != AF_INET)
 297                         return (EAFNOSUPPORT);
 298 #endif
 299                 if (sin->sin_addr.s_addr != INADDR_ANY)
 300                         if (prison_ip(cred, 0, &sin->sin_addr.s_addr))
 301                                 return(EINVAL);
 302                 if (sin->sin_port != *lportp) {
 303                         /* Don't allow the port to change. */
 304                         if (*lportp != 0)
 305                                 return (EINVAL);
 306                         lport = sin->sin_port;
 307                 }
 308                 /* NB: lport is left as 0 if the port isn't being changed. */
 309                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 310                         /*
 311                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 312                          * allow complete duplication of binding if
 313                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 314                          * and a multicast address is bound on both
 315                          * new and duplicated sockets.
 316                          */
 317                         if (so->so_options & SO_REUSEADDR)
 318                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 319                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 320                         sin->sin_port = 0;              /* yech... */
 321                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 322                         if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
 323                                 return (EADDRNOTAVAIL);
 324                 }
 325                 laddr = sin->sin_addr;
 326                 if (lport) {
 327                         struct inpcb *t;
 328                         struct tcptw *tw;
 329
 330                         /* GROSS */
 331                         if (ntohs(lport) <= ipport_reservedhigh &&
 332                             ntohs(lport) >= ipport_reservedlow &&
 333                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 334                             0))
 335                                 return (EACCES);
 336                         if (jailed(cred))
 337                                 prison = 1;
 338                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 339                             priv_check_cred(so->so_cred,
 340                             PRIV_NETINET_REUSEPORT, 0) != 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                                 /*
 366                                  * XXXRW: If an incpb has had its timewait
 367                                  * state recycled, we treat the address as
 368                                  * being in use (for now).  This is better
 369                                  * than a panic, but not desirable.
 370                                  */
 371                                 tw = intotw(inp);
 372                                 if (tw == NULL ||
 373                                     (reuseport & tw->tw_so_options) == 0)
 374                                         return (EADDRINUSE);
 375                         } else if (t &&
 376                             (reuseport & t->inp_socket->so_options) == 0) {
 377 #ifdef INET6
 378                                 if (ntohl(sin->sin_addr.s_addr) !=
 379                                     INADDR_ANY ||
 380                                     ntohl(t->inp_laddr.s_addr) !=
 381                                     INADDR_ANY ||
 382                                     INP_SOCKAF(so) ==
 383                                     INP_SOCKAF(t->inp_socket))
 384 #endif
 385                                 return (EADDRINUSE);
 386                         }
 387                 }
 388         }
 389         if (*lportp != 0)
 390                 lport = *lportp;
 391         if (lport == 0) {
 392                 u_short first, last;
 393                 int count;
 394
 395                 if (laddr.s_addr != INADDR_ANY)
 396                         if (prison_ip(cred, 0, &laddr.s_addr))
 397                                 return (EINVAL);
 398
 399                 if (inp->inp_flags & INP_HIGHPORT) {
 400                         first = ipport_hifirstauto;     /* sysctl */
 401                         last  = ipport_hilastauto;
 402                         lastport = &pcbinfo->ipi_lasthi;
 403                 } else if (inp->inp_flags & INP_LOWPORT) {
 404                         error = priv_check_cred(cred,
 405                             PRIV_NETINET_RESERVEDPORT, 0);
 406                         if (error)
 407                                 return error;
 408                         first = ipport_lowfirstauto;    /* 1023 */
 409                         last  = ipport_lowlastauto;     /* 600 */
 410                         lastport = &pcbinfo->ipi_lastlow;
 411                 } else {
 412                         first = ipport_firstauto;       /* sysctl */
 413                         last  = ipport_lastauto;
 414                         lastport = &pcbinfo->ipi_lastport;
 415                 }
 416                 /*
 417                  * For UDP, use random port allocation as long as the user
 418                  * allows it.  For TCP (and as of yet unknown) connections,
 419                  * use random port allocation only if the user allows it AND
 420                  * ipport_tick() allows it.
 421                  */
 422                 if (ipport_randomized &&
 423                         (!ipport_stoprandom || pcbinfo == &udbinfo))
 424                         dorandom = 1;
 425                 else
 426                         dorandom = 0;
 427                 /*
 428                  * It makes no sense to do random port allocation if
 429                  * we have the only port available.
 430                  */
 431                 if (first == last)
 432                         dorandom = 0;
 433                 /* Make sure to not include UDP packets in the count. */
 434                 if (pcbinfo != &udbinfo)
 435                         ipport_tcpallocs++;
 436                 /*
 437                  * Simple check to ensure all ports are not used up causing
 438                  * a deadlock here.
 439                  *
 440                  * We split the two cases (up and down) so that the direction
 441                  * is not being tested on each round of the loop.
 442                  */
 443                 if (first > last) {
 444                         /*
 445                          * counting down
 446                          */
 447                         if (dorandom)
 448                                 *lastport = first -
 449                                             (arc4random() % (first - last));
 450                         count = first - last;
 451
 452                         do {
 453                                 if (count-- < 0)        /* completely used? */
 454                                         return (EADDRNOTAVAIL);
 455                                 --*lastport;
 456                                 if (*lastport > first || *lastport < last)
 457                                         *lastport = first;
 458                                 lport = htons(*lastport);
 459                         } while (in_pcblookup_local(pcbinfo, laddr, lport,
 460                             wild));
 461                 } else {
 462                         /*
 463                          * counting up
 464                          */
 465                         if (dorandom)
 466                                 *lastport = first +
 467                                             (arc4random() % (last - first));
 468                         count = last - first;
 469
 470                         do {
 471                                 if (count-- < 0)        /* completely used? */
 472                                         return (EADDRNOTAVAIL);
 473                                 ++*lastport;
 474                                 if (*lastport < first || *lastport > last)
 475                                         *lastport = first;
 476                                 lport = htons(*lastport);
 477                         } while (in_pcblookup_local(pcbinfo, laddr, lport,
 478                             wild));
 479                 }
 480         }
 481         if (prison_ip(cred, 0, &laddr.s_addr))
 482                 return (EINVAL);
 483         *laddrp = laddr.s_addr;
 484         *lportp = lport;
 485         return (0);
 486 }
 487
 488 /*
 489  * Connect from a socket to a specified address.
 490  * Both address and port must be specified in argument sin.
 491  * If don't have a local address for this socket yet,
 492  * then pick one.
 493  */
 494 int
 495 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 496 {
 497         u_short lport, fport;
 498         in_addr_t laddr, faddr;
 499         int anonport, error;
 500
 501         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 502         INP_LOCK_ASSERT(inp);
 503
 504         lport = inp->inp_lport;
 505         laddr = inp->inp_laddr.s_addr;
 506         anonport = (lport == 0);
 507         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 508             NULL, cred);
 509         if (error)
 510                 return (error);
 511
 512         /* Do the initial binding of the local address if required. */
 513         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 514                 inp->inp_lport = lport;
 515                 inp->inp_laddr.s_addr = laddr;
 516                 if (in_pcbinshash(inp) != 0) {
 517                         inp->inp_laddr.s_addr = INADDR_ANY;
 518                         inp->inp_lport = 0;
 519                         return (EAGAIN);
 520                 }
 521         }
 522
 523         /* Commit the remaining changes. */
 524         inp->inp_lport = lport;
 525         inp->inp_laddr.s_addr = laddr;
 526         inp->inp_faddr.s_addr = faddr;
 527         inp->inp_fport = fport;
 528         in_pcbrehash(inp);
 529
 530         if (anonport)
 531                 inp->inp_flags |= INP_ANONPORT;
 532         return (0);
 533 }
 534
 535 /*
 536  * Set up for a connect from a socket to the specified address.
 537  * On entry, *laddrp and *lportp should contain the current local
 538  * address and port for the PCB; these are updated to the values
 539  * that should be placed in inp_laddr and inp_lport to complete
 540  * the connect.
 541  *
 542  * On success, *faddrp and *fportp will be set to the remote address
 543  * and port. These are not updated in the error case.
 544  *
 545  * If the operation fails because the connection already exists,
 546  * *oinpp will be set to the PCB of that connection so that the
 547  * caller can decide to override it. In all other cases, *oinpp
 548  * is set to NULL.
 549  */
 550 int
 551 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 552     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 553     struct inpcb **oinpp, struct ucred *cred)
 554 {
 555         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 556         struct in_ifaddr *ia;
 557         struct sockaddr_in sa;
 558         struct ucred *socred;
 559         struct inpcb *oinp;
 560         struct in_addr laddr, faddr;
 561         u_short lport, fport;
 562         int error;
 563
 564         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 565         INP_LOCK_ASSERT(inp);
 566
 567         if (oinpp != NULL)
 568                 *oinpp = NULL;
 569         if (nam->sa_len != sizeof (*sin))
 570                 return (EINVAL);
 571         if (sin->sin_family != AF_INET)
 572                 return (EAFNOSUPPORT);
 573         if (sin->sin_port == 0)
 574                 return (EADDRNOTAVAIL);
 575         laddr.s_addr = *laddrp;
 576         lport = *lportp;
 577         faddr = sin->sin_addr;
 578         fport = sin->sin_port;
 579         socred = inp->inp_socket->so_cred;
 580         if (laddr.s_addr == INADDR_ANY && jailed(socred)) {
 581                 bzero(&sa, sizeof(sa));
 582                 sa.sin_addr.s_addr = htonl(prison_getip(socred));
 583                 sa.sin_len = sizeof(sa);
 584                 sa.sin_family = AF_INET;
 585                 error = in_pcbbind_setup(inp, (struct sockaddr *)&sa,
 586                     &laddr.s_addr, &lport, cred);
 587                 if (error)
 588                         return (error);
 589         }
 590         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 591                 /*
 592                  * If the destination address is INADDR_ANY,
 593                  * use the primary local address.
 594                  * If the supplied address is INADDR_BROADCAST,
 595                  * and the primary interface supports broadcast,
 596                  * choose the broadcast address for that interface.
 597                  */
 598                 if (faddr.s_addr == INADDR_ANY)
 599                         faddr = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr;
 600                 else if (faddr.s_addr == (u_long)INADDR_BROADCAST &&
 601                     (TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags &
 602                     IFF_BROADCAST))
 603                         faddr = satosin(&TAILQ_FIRST(
 604                             &in_ifaddrhead)->ia_broadaddr)->sin_addr;
 605         }
 606         if (laddr.s_addr == INADDR_ANY) {
 607                 ia = (struct in_ifaddr *)0;
 608                 /*
 609                  * If route is known our src addr is taken from the i/f,
 610                  * else punt.
 611                  *
 612                  * Find out route to destination
 613                  */
 614                 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 615                         ia = ip_rtaddr(faddr);
 616                 /*
 617                  * If we found a route, use the address corresponding to
 618                  * the outgoing interface.
 619                  *
 620                  * Otherwise assume faddr is reachable on a directly connected
 621                  * network and try to find a corresponding interface to take
 622                  * the source address from.
 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 }
 690
 691 /*
 692  * In the old world order, in_pcbdetach() served two functions: to detach the
 693  * pcb from the socket/potentially free the socket, and to free the pcb
 694  * itself.  In the new world order, the protocol code is responsible for
 695  * managing the relationship with the socket, and this code simply frees the
 696  * pcb.
 697  */
 698 void
 699 in_pcbdetach(struct inpcb *inp)
 700 {
 701
 702         KASSERT(inp->inp_socket != NULL, ("in_pcbdetach: inp_socket == NULL"));
 703         inp->inp_socket->so_pcb = NULL;
 704         inp->inp_socket = NULL;
 705 }
 706
 707 void
 708 in_pcbfree(struct inpcb *inp)
 709 {
 710         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 711
 712         KASSERT(inp->inp_socket == NULL, ("in_pcbfree: inp_socket != NULL"));
 713         INP_INFO_WLOCK_ASSERT(ipi);
 714         INP_LOCK_ASSERT(inp);
 715
 716 #ifdef IPSEC
 717         ipsec4_delete_pcbpolicy(inp);
 718 #endif /*IPSEC*/
 719         inp->inp_gencnt = ++ipi->ipi_gencnt;
 720         in_pcbremlists(inp);
 721         if (inp->inp_options)
 722                 (void)m_free(inp->inp_options);
 723         if (inp->inp_moptions != NULL)
 724                 inp_freemoptions(inp->inp_moptions);
 725         inp->inp_vflag = 0;
 726
 727 #ifdef MAC
 728         mac_inpcb_destroy(inp);
 729 #endif
 730         INP_UNLOCK(inp);
 731         uma_zfree(ipi->ipi_zone, inp);
 732 }
 733
 734 /*
 735  * TCP needs to maintain its inpcb structure after the TCP connection has
 736  * been torn down.  However, it must be disconnected from the inpcb hashes as
 737  * it must not prevent binding of future connections to the same port/ip
 738  * combination by other inpcbs.
 739  */
 740 void
 741 in_pcbdrop(struct inpcb *inp)
 742 {
 743
 744         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 745         INP_LOCK_ASSERT(inp);
 746
 747         inp->inp_vflag |= INP_DROPPED;
 748         if (inp->inp_lport) {
 749                 struct inpcbport *phd = inp->inp_phd;
 750
 751                 LIST_REMOVE(inp, inp_hash);
 752                 LIST_REMOVE(inp, inp_portlist);
 753                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 754                         LIST_REMOVE(phd, phd_hash);
 755                         free(phd, M_PCB);
 756                 }
 757                 inp->inp_lport = 0;
 758         }
 759 }
 760
 761 /*
 762  * Common routines to return the socket addresses associated with inpcbs.
 763  */
 764 struct sockaddr *
 765 in_sockaddr(in_port_t port, struct in_addr *addr_p)
 766 {
 767         struct sockaddr_in *sin;
 768
 769         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 770                 M_WAITOK | M_ZERO);
 771         sin->sin_family = AF_INET;
 772         sin->sin_len = sizeof(*sin);
 773         sin->sin_addr = *addr_p;
 774         sin->sin_port = port;
 775
 776         return (struct sockaddr *)sin;
 777 }
 778
 779 int
 780 in_getsockaddr(struct socket *so, struct sockaddr **nam)
 781 {
 782         struct inpcb *inp;
 783         struct in_addr addr;
 784         in_port_t port;
 785
 786         inp = sotoinpcb(so);
 787         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
 788
 789         INP_LOCK(inp);
 790         port = inp->inp_lport;
 791         addr = inp->inp_laddr;
 792         INP_UNLOCK(inp);
 793
 794         *nam = in_sockaddr(port, &addr);
 795         return 0;
 796 }
 797
 798 int
 799 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
 800 {
 801         struct inpcb *inp;
 802         struct in_addr addr;
 803         in_port_t port;
 804
 805         inp = sotoinpcb(so);
 806         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
 807
 808         INP_LOCK(inp);
 809         port = inp->inp_fport;
 810         addr = inp->inp_faddr;
 811         INP_UNLOCK(inp);
 812
 813         *nam = in_sockaddr(port, &addr);
 814         return 0;
 815 }
 816
 817 void
 818 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
 819     struct inpcb *(*notify)(struct inpcb *, int))
 820 {
 821         struct inpcb *inp, *ninp;
 822         struct inpcbhead *head;
 823
 824         INP_INFO_WLOCK(pcbinfo);
 825         head = pcbinfo->ipi_listhead;
 826         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 827                 INP_LOCK(inp);
 828                 ninp = LIST_NEXT(inp, inp_list);
 829 #ifdef INET6
 830                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 831                         INP_UNLOCK(inp);
 832                         continue;
 833                 }
 834 #endif
 835                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 836                     inp->inp_socket == NULL) {
 837                         INP_UNLOCK(inp);
 838                         continue;
 839                 }
 840                 if ((*notify)(inp, errno))
 841                         INP_UNLOCK(inp);
 842         }
 843         INP_INFO_WUNLOCK(pcbinfo);
 844 }
 845
 846 void
 847 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 848 {
 849         struct inpcb *inp;
 850         struct ip_moptions *imo;
 851         int i, gap;
 852
 853         INP_INFO_RLOCK(pcbinfo);
 854         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
 855                 INP_LOCK(inp);
 856                 imo = inp->inp_moptions;
 857                 if ((inp->inp_vflag & INP_IPV4) &&
 858                     imo != NULL) {
 859                         /*
 860                          * Unselect the outgoing interface if it is being
 861                          * detached.
 862                          */
 863                         if (imo->imo_multicast_ifp == ifp)
 864                                 imo->imo_multicast_ifp = NULL;
 865
 866                         /*
 867                          * Drop multicast group membership if we joined
 868                          * through the interface being detached.
 869                          */
 870                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 871                             i++) {
 872                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 873                                         in_delmulti(imo->imo_membership[i]);
 874                                         gap++;
 875                                 } else if (gap != 0)
 876                                         imo->imo_membership[i - gap] =
 877                                             imo->imo_membership[i];
 878                         }
 879                         imo->imo_num_memberships -= gap;
 880                 }
 881                 INP_UNLOCK(inp);
 882         }
 883         INP_INFO_RUNLOCK(pcbinfo);
 884 }
 885
 886 /*
 887  * Lookup a PCB based on the local address and port.
 888  */
 889 #define INP_LOOKUP_MAPPED_PCB_COST      3
 890 struct inpcb *
 891 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 892     u_int lport_arg, int wild_okay)
 893 {
 894         struct inpcb *inp;
 895 #ifdef INET6
 896         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
 897 #else
 898         int matchwild = 3;
 899 #endif
 900         int wildcard;
 901         u_short lport = lport_arg;
 902
 903         INP_INFO_WLOCK_ASSERT(pcbinfo);
 904
 905         if (!wild_okay) {
 906                 struct inpcbhead *head;
 907                 /*
 908                  * Look for an unconnected (wildcard foreign addr) PCB that
 909                  * matches the local address and port we're looking for.
 910                  */
 911                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 912                     0, pcbinfo->ipi_hashmask)];
 913                 LIST_FOREACH(inp, head, inp_hash) {
 914 #ifdef INET6
 915                         if ((inp->inp_vflag & INP_IPV4) == 0)
 916                                 continue;
 917 #endif
 918                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 919                             inp->inp_laddr.s_addr == laddr.s_addr &&
 920                             inp->inp_lport == lport) {
 921                                 /*
 922                                  * Found.
 923                                  */
 924                                 return (inp);
 925                         }
 926                 }
 927                 /*
 928                  * Not found.
 929                  */
 930                 return (NULL);
 931         } else {
 932                 struct inpcbporthead *porthash;
 933                 struct inpcbport *phd;
 934                 struct inpcb *match = NULL;
 935                 /*
 936                  * Best fit PCB lookup.
 937                  *
 938                  * First see if this local port is in use by looking on the
 939                  * port hash list.
 940                  */
 941                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 942                     pcbinfo->ipi_porthashmask)];
 943                 LIST_FOREACH(phd, porthash, phd_hash) {
 944                         if (phd->phd_port == lport)
 945                                 break;
 946                 }
 947                 if (phd != NULL) {
 948                         /*
 949                          * Port is in use by one or more PCBs. Look for best
 950                          * fit.
 951                          */
 952                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 953                                 wildcard = 0;
 954 #ifdef INET6
 955                                 if ((inp->inp_vflag & INP_IPV4) == 0)
 956                                         continue;
 957                                 /*
 958                                  * We never select the PCB that has
 959                                  * INP_IPV6 flag and is bound to :: if
 960                                  * we have another PCB which is bound
 961                                  * to 0.0.0.0.  If a PCB has the
 962                                  * INP_IPV6 flag, then we set its cost
 963                                  * higher than IPv4 only PCBs.
 964                                  *
 965                                  * Note that the case only happens
 966                                  * when a socket is bound to ::, under
 967                                  * the condition that the use of the
 968                                  * mapped address is allowed.
 969                                  */
 970                                 if ((inp->inp_vflag & INP_IPV6) != 0)
 971                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
 972 #endif
 973                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
 974                                         wildcard++;
 975                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
 976                                         if (laddr.s_addr == INADDR_ANY)
 977                                                 wildcard++;
 978                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
 979                                                 continue;
 980                                 } else {
 981                                         if (laddr.s_addr != INADDR_ANY)
 982                                                 wildcard++;
 983                                 }
 984                                 if (wildcard < matchwild) {
 985                                         match = inp;
 986                                         matchwild = wildcard;
 987                                         if (matchwild == 0) {
 988                                                 break;
 989                                         }
 990                                 }
 991                         }
 992                 }
 993                 return (match);
 994         }
 995 }
 996 #undef INP_LOOKUP_MAPPED_PCB_COST
 997
 998 /*
 999  * Lookup PCB in hash list.
1000  */
1001 struct inpcb *
1002 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1003     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int wildcard,
1004     struct ifnet *ifp)
1005 {
1006         struct inpcbhead *head;
1007         struct inpcb *inp;
1008         u_short fport = fport_arg, lport = lport_arg;
1009
1010         INP_INFO_RLOCK_ASSERT(pcbinfo);
1011
1012         /*
1013          * First look for an exact match.
1014          */
1015         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1016             pcbinfo->ipi_hashmask)];
1017         LIST_FOREACH(inp, head, inp_hash) {
1018 #ifdef INET6
1019                 if ((inp->inp_vflag & INP_IPV4) == 0)
1020                         continue;
1021 #endif
1022                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1023                     inp->inp_laddr.s_addr == laddr.s_addr &&
1024                     inp->inp_fport == fport &&
1025                     inp->inp_lport == lport)
1026                         return (inp);
1027         }
1028
1029         /*
1030          * Then look for a wildcard match, if requested.
1031          */
1032         if (wildcard) {
1033                 struct inpcb *local_wild = NULL;
1034 #ifdef INET6
1035                 struct inpcb *local_wild_mapped = NULL;
1036 #endif
1037
1038                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1039                     0, pcbinfo->ipi_hashmask)];
1040                 LIST_FOREACH(inp, head, inp_hash) {
1041 #ifdef INET6
1042                         if ((inp->inp_vflag & INP_IPV4) == 0)
1043                                 continue;
1044 #endif
1045                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1046                             inp->inp_lport == lport) {
1047                                 if (ifp && ifp->if_type == IFT_FAITH &&
1048                                     (inp->inp_flags & INP_FAITH) == 0)
1049                                         continue;
1050                                 if (inp->inp_laddr.s_addr == laddr.s_addr)
1051                                         return (inp);
1052                                 else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1053 #ifdef INET6
1054                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
1055                                                              AF_INET6))
1056                                                 local_wild_mapped = inp;
1057                                         else
1058 #endif
1059                                                 local_wild = inp;
1060                                 }
1061                         }
1062                 }
1063 #ifdef INET6
1064                 if (local_wild == NULL)
1065                         return (local_wild_mapped);
1066 #endif
1067                 return (local_wild);
1068         }
1069         return (NULL);
1070 }
1071
1072 /*
1073  * Insert PCB onto various hash lists.
1074  */
1075 int
1076 in_pcbinshash(struct inpcb *inp)
1077 {
1078         struct inpcbhead *pcbhash;
1079         struct inpcbporthead *pcbporthash;
1080         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1081         struct inpcbport *phd;
1082         u_int32_t hashkey_faddr;
1083
1084         INP_INFO_WLOCK_ASSERT(pcbinfo);
1085         INP_LOCK_ASSERT(inp);
1086
1087 #ifdef INET6
1088         if (inp->inp_vflag & INP_IPV6)
1089                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1090         else
1091 #endif /* INET6 */
1092         hashkey_faddr = inp->inp_faddr.s_addr;
1093
1094         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1095                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1096
1097         pcbporthash = &pcbinfo->ipi_porthashbase[
1098             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
1099
1100         /*
1101          * Go through port list and look for a head for this lport.
1102          */
1103         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1104                 if (phd->phd_port == inp->inp_lport)
1105                         break;
1106         }
1107         /*
1108          * If none exists, malloc one and tack it on.
1109          */
1110         if (phd == NULL) {
1111                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1112                 if (phd == NULL) {
1113                         return (ENOBUFS); /* XXX */
1114                 }
1115                 phd->phd_port = inp->inp_lport;
1116                 LIST_INIT(&phd->phd_pcblist);
1117                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1118         }
1119         inp->inp_phd = phd;
1120         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1121         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1122         return (0);
1123 }
1124
1125 /*
1126  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1127  * changed. NOTE: This does not handle the case of the lport changing (the
1128  * hashed port list would have to be updated as well), so the lport must
1129  * not change after in_pcbinshash() has been called.
1130  */
1131 void
1132 in_pcbrehash(struct inpcb *inp)
1133 {
1134         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1135         struct inpcbhead *head;
1136         u_int32_t hashkey_faddr;
1137
1138         INP_INFO_WLOCK_ASSERT(pcbinfo);
1139         INP_LOCK_ASSERT(inp);
1140
1141 #ifdef INET6
1142         if (inp->inp_vflag & INP_IPV6)
1143                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1144         else
1145 #endif /* INET6 */
1146         hashkey_faddr = inp->inp_faddr.s_addr;
1147
1148         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1149                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1150
1151         LIST_REMOVE(inp, inp_hash);
1152         LIST_INSERT_HEAD(head, inp, inp_hash);
1153 }
1154
1155 /*
1156  * Remove PCB from various lists.
1157  */
1158 void
1159 in_pcbremlists(struct inpcb *inp)
1160 {
1161         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1162
1163         INP_INFO_WLOCK_ASSERT(pcbinfo);
1164         INP_LOCK_ASSERT(inp);
1165
1166         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1167         if (inp->inp_lport) {
1168                 struct inpcbport *phd = inp->inp_phd;
1169
1170                 LIST_REMOVE(inp, inp_hash);
1171                 LIST_REMOVE(inp, inp_portlist);
1172                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1173                         LIST_REMOVE(phd, phd_hash);
1174                         free(phd, M_PCB);
1175                 }
1176         }
1177         LIST_REMOVE(inp, inp_list);
1178         pcbinfo->ipi_count--;
1179 }
1180
1181 /*
1182  * A set label operation has occurred at the socket layer, propagate the
1183  * label change into the in_pcb for the socket.
1184  */
1185 void
1186 in_pcbsosetlabel(struct socket *so)
1187 {
1188 #ifdef MAC
1189         struct inpcb *inp;
1190
1191         inp = sotoinpcb(so);
1192         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
1193
1194         INP_LOCK(inp);
1195         SOCK_LOCK(so);
1196         mac_inpcb_sosetlabel(so, inp);
1197         SOCK_UNLOCK(so);
1198         INP_UNLOCK(inp);
1199 #endif
1200 }
1201
1202 /*
1203  * ipport_tick runs once per second, determining if random port allocation
1204  * should be continued.  If more than ipport_randomcps ports have been
1205  * allocated in the last second, then we return to sequential port
1206  * allocation. We return to random allocation only once we drop below
1207  * ipport_randomcps for at least ipport_randomtime seconds.
1208  */
1209 void
1210 ipport_tick(void *xtp)
1211 {
1212
1213         if (ipport_tcpallocs <= ipport_tcplastcount + ipport_randomcps) {
1214                 if (ipport_stoprandom > 0)
1215                         ipport_stoprandom--;
1216         } else
1217                 ipport_stoprandom = ipport_randomtime;
1218         ipport_tcplastcount = ipport_tcpallocs;
1219         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
1220 }
1221
1222 #ifdef DDB
1223 static void
1224 db_print_indent(int indent)
1225 {
1226         int i;
1227
1228         for (i = 0; i < indent; i++)
1229                 db_printf(" ");
1230 }
1231
1232 static void
1233 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
1234 {
1235         char faddr_str[48], laddr_str[48];
1236
1237         db_print_indent(indent);
1238         db_printf("%s at %p\n", name, inc);
1239
1240         indent += 2;
1241
1242 #ifdef INET6
1243         if (inc->inc_flags == 1) {
1244                 /* IPv6. */
1245                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
1246                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
1247         } else {
1248 #endif
1249                 /* IPv4. */
1250                 inet_ntoa_r(inc->inc_laddr, laddr_str);
1251                 inet_ntoa_r(inc->inc_faddr, faddr_str);
1252 #ifdef INET6
1253         }
1254 #endif
1255         db_print_indent(indent);
1256         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
1257             ntohs(inc->inc_lport));
1258         db_print_indent(indent);
1259         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
1260             ntohs(inc->inc_fport));
1261 }
1262
1263 static void
1264 db_print_inpflags(int inp_flags)
1265 {
1266         int comma;
1267
1268         comma = 0;
1269         if (inp_flags & INP_RECVOPTS) {
1270                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
1271                 comma = 1;
1272         }
1273         if (inp_flags & INP_RECVRETOPTS) {
1274                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
1275                 comma = 1;
1276         }
1277         if (inp_flags & INP_RECVDSTADDR) {
1278                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
1279                 comma = 1;
1280         }
1281         if (inp_flags & INP_HDRINCL) {
1282                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
1283                 comma = 1;
1284         }
1285         if (inp_flags & INP_HIGHPORT) {
1286                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
1287                 comma = 1;
1288         }
1289         if (inp_flags & INP_LOWPORT) {
1290                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
1291                 comma = 1;
1292         }
1293         if (inp_flags & INP_ANONPORT) {
1294                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
1295                 comma = 1;
1296         }
1297         if (inp_flags & INP_RECVIF) {
1298                 db_printf("%sINP_RECVIF", comma ? ", " : "");
1299                 comma = 1;
1300         }
1301         if (inp_flags & INP_MTUDISC) {
1302                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
1303                 comma = 1;
1304         }
1305         if (inp_flags & INP_FAITH) {
1306                 db_printf("%sINP_FAITH", comma ? ", " : "");
1307                 comma = 1;
1308         }
1309         if (inp_flags & INP_RECVTTL) {
1310                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
1311                 comma = 1;
1312         }
1313         if (inp_flags & INP_DONTFRAG) {
1314                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
1315                 comma = 1;
1316         }
1317         if (inp_flags & IN6P_IPV6_V6ONLY) {
1318                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
1319                 comma = 1;
1320         }
1321         if (inp_flags & IN6P_PKTINFO) {
1322                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
1323                 comma = 1;
1324         }
1325         if (inp_flags & IN6P_HOPLIMIT) {
1326                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
1327                 comma = 1;
1328         }
1329         if (inp_flags & IN6P_HOPOPTS) {
1330                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
1331                 comma = 1;
1332         }
1333         if (inp_flags & IN6P_DSTOPTS) {
1334                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
1335                 comma = 1;
1336         }
1337         if (inp_flags & IN6P_RTHDR) {
1338                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
1339                 comma = 1;
1340         }
1341         if (inp_flags & IN6P_RTHDRDSTOPTS) {
1342                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
1343                 comma = 1;
1344         }
1345         if (inp_flags & IN6P_TCLASS) {
1346                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
1347                 comma = 1;
1348         }
1349         if (inp_flags & IN6P_AUTOFLOWLABEL) {
1350                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
1351                 comma = 1;
1352         }
1353         if (inp_flags & IN6P_RFC2292) {
1354                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
1355                 comma = 1;
1356         }
1357         if (inp_flags & IN6P_MTU) {
1358                 db_printf("IN6P_MTU%s", comma ? ", " : "");
1359                 comma = 1;
1360         }
1361 }
1362
1363 static void
1364 db_print_inpvflag(u_char inp_vflag)
1365 {
1366         int comma;
1367
1368         comma = 0;
1369         if (inp_vflag & INP_IPV4) {
1370                 db_printf("%sINP_IPV4", comma ? ", " : "");
1371                 comma  = 1;
1372         }
1373         if (inp_vflag & INP_IPV6) {
1374                 db_printf("%sINP_IPV6", comma ? ", " : "");
1375                 comma  = 1;
1376         }
1377         if (inp_vflag & INP_IPV6PROTO) {
1378                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
1379                 comma  = 1;
1380         }
1381         if (inp_vflag & INP_TIMEWAIT) {
1382                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
1383                 comma  = 1;
1384         }
1385         if (inp_vflag & INP_ONESBCAST) {
1386                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
1387                 comma  = 1;
1388         }
1389         if (inp_vflag & INP_DROPPED) {
1390                 db_printf("%sINP_DROPPED", comma ? ", " : "");
1391                 comma  = 1;
1392         }
1393         if (inp_vflag & INP_SOCKREF) {
1394                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
1395                 comma  = 1;
1396         }
1397 }
1398
1399 void
1400 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
1401 {
1402
1403         db_print_indent(indent);
1404         db_printf("%s at %p\n", name, inp);
1405
1406         indent += 2;
1407
1408         db_print_indent(indent);
1409         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
1410
1411         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
1412
1413         db_print_indent(indent);
1414         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
1415             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
1416
1417         db_print_indent(indent);
1418         db_printf("inp_label: %p   inp_flags: 0x%x (",
1419            inp->inp_label, inp->inp_flags);
1420         db_print_inpflags(inp->inp_flags);
1421         db_printf(")\n");
1422
1423         db_print_indent(indent);
1424         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
1425             inp->inp_vflag);
1426         db_print_inpvflag(inp->inp_vflag);
1427         db_printf(")\n");
1428
1429         db_print_indent(indent);
1430         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
1431             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
1432
1433         db_print_indent(indent);
1434 #ifdef INET6
1435         if (inp->inp_vflag & INP_IPV6) {
1436                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
1437                     "in6p_moptions: %p\n", inp->in6p_options,
1438                     inp->in6p_outputopts, inp->in6p_moptions);
1439                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
1440                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
1441                     inp->in6p_hops);
1442         } else
1443 #endif
1444         {
1445                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
1446                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
1447                     inp->inp_options, inp->inp_moptions);
1448         }
1449
1450         db_print_indent(indent);
1451         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
1452             (uintmax_t)inp->inp_gencnt);
1453 }
1454
1455 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
1456 {
1457         struct inpcb *inp;
1458
1459         if (!have_addr) {
1460                 db_printf("usage: show inpcb <addr>\n");
1461                 return;
1462         }
1463         inp = (struct inpcb *)addr;
1464
1465         db_print_inpcb(inp, "inpcb", 0);
1466 }
1467 #endif