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_EPHEMERALFIRST;       /* 10000 */
  93 int     ipport_lastauto  = IPPORT_EPHEMERALLAST;        /* 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         inp->inp_inc.inc_fibnum = so->so_fibnum;
 190 #ifdef MAC
 191         error = mac_inpcb_init(inp, M_NOWAIT);
 192         if (error != 0)
 193                 goto out;
 194         SOCK_LOCK(so);
 195         mac_inpcb_create(so, inp);
 196         SOCK_UNLOCK(so);
 197 #endif
 198
 199 #ifdef IPSEC
 200         error = ipsec_init_policy(so, &inp->inp_sp);
 201         if (error != 0) {
 202 #ifdef MAC
 203                 mac_inpcb_destroy(inp);
 204 #endif
 205                 goto out;
 206         }
 207 #endif /*IPSEC*/
 208 #ifdef INET6
 209         if (INP_SOCKAF(so) == AF_INET6) {
 210                 inp->inp_vflag |= INP_IPV6PROTO;
 211                 if (ip6_v6only)
 212                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 213         }
 214 #endif
 215         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
 216         pcbinfo->ipi_count++;
 217         so->so_pcb = (caddr_t)inp;
 218 #ifdef INET6
 219         if (ip6_auto_flowlabel)
 220                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 221 #endif
 222         INP_WLOCK(inp);
 223         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 224
 225 #if defined(IPSEC) || defined(MAC)
 226 out:
 227         if (error != 0)
 228                 uma_zfree(pcbinfo->ipi_zone, inp);
 229 #endif
 230         return (error);
 231 }
 232
 233 int
 234 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 235 {
 236         int anonport, error;
 237
 238         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 239         INP_WLOCK_ASSERT(inp);
 240
 241         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 242                 return (EINVAL);
 243         anonport = inp->inp_lport == 0 && (nam == NULL ||
 244             ((struct sockaddr_in *)nam)->sin_port == 0);
 245         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 246             &inp->inp_lport, cred);
 247         if (error)
 248                 return (error);
 249         if (in_pcbinshash(inp) != 0) {
 250                 inp->inp_laddr.s_addr = INADDR_ANY;
 251                 inp->inp_lport = 0;
 252                 return (EAGAIN);
 253         }
 254         if (anonport)
 255                 inp->inp_flags |= INP_ANONPORT;
 256         return (0);
 257 }
 258
 259 /*
 260  * Set up a bind operation on a PCB, performing port allocation
 261  * as required, but do not actually modify the PCB. Callers can
 262  * either complete the bind by setting inp_laddr/inp_lport and
 263  * calling in_pcbinshash(), or they can just use the resulting
 264  * port and address to authorise the sending of a once-off packet.
 265  *
 266  * On error, the values of *laddrp and *lportp are not changed.
 267  */
 268 int
 269 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 270     u_short *lportp, struct ucred *cred)
 271 {
 272         struct socket *so = inp->inp_socket;
 273         unsigned short *lastport;
 274         struct sockaddr_in *sin;
 275         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 276         struct in_addr laddr;
 277         u_short lport = 0;
 278         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 279         int error, prison = 0;
 280         int dorandom;
 281
 282         /*
 283          * Because no actual state changes occur here, a write global write
 284          * lock on the pcbinfo isn't required.
 285          */
 286         INP_INFO_LOCK_ASSERT(pcbinfo);
 287         INP_LOCK_ASSERT(inp);
 288
 289         if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
 290                 return (EADDRNOTAVAIL);
 291         laddr.s_addr = *laddrp;
 292         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 293                 return (EINVAL);
 294         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 295                 wild = INPLOOKUP_WILDCARD;
 296         if (nam) {
 297                 sin = (struct sockaddr_in *)nam;
 298                 if (nam->sa_len != sizeof (*sin))
 299                         return (EINVAL);
 300 #ifdef notdef
 301                 /*
 302                  * We should check the family, but old programs
 303                  * incorrectly fail to initialize it.
 304                  */
 305                 if (sin->sin_family != AF_INET)
 306                         return (EAFNOSUPPORT);
 307 #endif
 308                 if (sin->sin_addr.s_addr != INADDR_ANY)
 309                         if (prison_ip(cred, 0, &sin->sin_addr.s_addr))
 310                                 return(EINVAL);
 311                 if (sin->sin_port != *lportp) {
 312                         /* Don't allow the port to change. */
 313                         if (*lportp != 0)
 314                                 return (EINVAL);
 315                         lport = sin->sin_port;
 316                 }
 317                 /* NB: lport is left as 0 if the port isn't being changed. */
 318                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 319                         /*
 320                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 321                          * allow complete duplication of binding if
 322                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 323                          * and a multicast address is bound on both
 324                          * new and duplicated sockets.
 325                          */
 326                         if (so->so_options & SO_REUSEADDR)
 327                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 328                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 329                         sin->sin_port = 0;              /* yech... */
 330                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 331                         if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
 332                                 return (EADDRNOTAVAIL);
 333                 }
 334                 laddr = sin->sin_addr;
 335                 if (lport) {
 336                         struct inpcb *t;
 337                         struct tcptw *tw;
 338
 339                         /* GROSS */
 340                         if (ntohs(lport) <= ipport_reservedhigh &&
 341                             ntohs(lport) >= ipport_reservedlow &&
 342                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 343                             0))
 344                                 return (EACCES);
 345                         if (jailed(cred))
 346                                 prison = 1;
 347                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 348                             priv_check_cred(so->so_cred,
 349                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 350                                 t = in_pcblookup_local(pcbinfo,
 351                                     sin->sin_addr, lport,
 352                                     prison ? 0 :  INPLOOKUP_WILDCARD);
 353         /*
 354          * XXX
 355          * This entire block sorely needs a rewrite.
 356          */
 357                                 if (t &&
 358                                     ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
 359                                     (so->so_type != SOCK_STREAM ||
 360                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
 361                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
 362                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 363                                      (t->inp_socket->so_options &
 364                                          SO_REUSEPORT) == 0) &&
 365                                     (so->so_cred->cr_uid !=
 366                                      t->inp_socket->so_cred->cr_uid))
 367                                         return (EADDRINUSE);
 368                         }
 369                         if (prison && prison_ip(cred, 0, &sin->sin_addr.s_addr))
 370                                 return (EADDRNOTAVAIL);
 371                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 372                             lport, prison ? 0 : wild);
 373                         if (t && (t->inp_vflag & INP_TIMEWAIT)) {
 374                                 /*
 375                                  * XXXRW: If an incpb has had its timewait
 376                                  * state recycled, we treat the address as
 377                                  * being in use (for now).  This is better
 378                                  * than a panic, but not desirable.
 379                                  */
 380                                 tw = intotw(inp);
 381                                 if (tw == NULL ||
 382                                     (reuseport & tw->tw_so_options) == 0)
 383                                         return (EADDRINUSE);
 384                         } else if (t &&
 385                             (reuseport & t->inp_socket->so_options) == 0) {
 386 #ifdef INET6
 387                                 if (ntohl(sin->sin_addr.s_addr) !=
 388                                     INADDR_ANY ||
 389                                     ntohl(t->inp_laddr.s_addr) !=
 390                                     INADDR_ANY ||
 391                                     INP_SOCKAF(so) ==
 392                                     INP_SOCKAF(t->inp_socket))
 393 #endif
 394                                 return (EADDRINUSE);
 395                         }
 396                 }
 397         }
 398         if (*lportp != 0)
 399                 lport = *lportp;
 400         if (lport == 0) {
 401                 u_short first, last, aux;
 402                 int count;
 403
 404                 if (laddr.s_addr != INADDR_ANY)
 405                         if (prison_ip(cred, 0, &laddr.s_addr))
 406                                 return (EINVAL);
 407
 408                 if (inp->inp_flags & INP_HIGHPORT) {
 409                         first = ipport_hifirstauto;     /* sysctl */
 410                         last  = ipport_hilastauto;
 411                         lastport = &pcbinfo->ipi_lasthi;
 412                 } else if (inp->inp_flags & INP_LOWPORT) {
 413                         error = priv_check_cred(cred,
 414                             PRIV_NETINET_RESERVEDPORT, 0);
 415                         if (error)
 416                                 return error;
 417                         first = ipport_lowfirstauto;    /* 1023 */
 418                         last  = ipport_lowlastauto;     /* 600 */
 419                         lastport = &pcbinfo->ipi_lastlow;
 420                 } else {
 421                         first = ipport_firstauto;       /* sysctl */
 422                         last  = ipport_lastauto;
 423                         lastport = &pcbinfo->ipi_lastport;
 424                 }
 425                 /*
 426                  * For UDP, use random port allocation as long as the user
 427                  * allows it.  For TCP (and as of yet unknown) connections,
 428                  * use random port allocation only if the user allows it AND
 429                  * ipport_tick() allows it.
 430                  */
 431                 if (ipport_randomized &&
 432                         (!ipport_stoprandom || pcbinfo == &udbinfo))
 433                         dorandom = 1;
 434                 else
 435                         dorandom = 0;
 436                 /*
 437                  * It makes no sense to do random port allocation if
 438                  * we have the only port available.
 439                  */
 440                 if (first == last)
 441                         dorandom = 0;
 442                 /* Make sure to not include UDP packets in the count. */
 443                 if (pcbinfo != &udbinfo)
 444                         ipport_tcpallocs++;
 445                 /*
 446                  * Simple check to ensure all ports are not used up causing
 447                  * a deadlock here.
 448                  */
 449                 if (first > last) {
 450                         aux = first;
 451                         first = last;
 452                         last = aux;
 453                 }
 454
 455                 if (dorandom)
 456                         *lastport = first +
 457                                     (arc4random() % (last - first));
 458
 459                 count = last - first;
 460
 461                 do {
 462                         if (count-- < 0)        /* completely used? */
 463                                 return (EADDRNOTAVAIL);
 464                         ++*lastport;
 465                         if (*lastport < first || *lastport > last)
 466                                 *lastport = first;
 467                         lport = htons(*lastport);
 468                 } while (in_pcblookup_local(pcbinfo, laddr, lport,
 469                     wild));
 470         }
 471         if (prison_ip(cred, 0, &laddr.s_addr))
 472                 return (EINVAL);
 473         *laddrp = laddr.s_addr;
 474         *lportp = lport;
 475         return (0);
 476 }
 477
 478 /*
 479  * Connect from a socket to a specified address.
 480  * Both address and port must be specified in argument sin.
 481  * If don't have a local address for this socket yet,
 482  * then pick one.
 483  */
 484 int
 485 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 486 {
 487         u_short lport, fport;
 488         in_addr_t laddr, faddr;
 489         int anonport, error;
 490
 491         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 492         INP_WLOCK_ASSERT(inp);
 493
 494         lport = inp->inp_lport;
 495         laddr = inp->inp_laddr.s_addr;
 496         anonport = (lport == 0);
 497         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 498             NULL, cred);
 499         if (error)
 500                 return (error);
 501
 502         /* Do the initial binding of the local address if required. */
 503         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 504                 inp->inp_lport = lport;
 505                 inp->inp_laddr.s_addr = laddr;
 506                 if (in_pcbinshash(inp) != 0) {
 507                         inp->inp_laddr.s_addr = INADDR_ANY;
 508                         inp->inp_lport = 0;
 509                         return (EAGAIN);
 510                 }
 511         }
 512
 513         /* Commit the remaining changes. */
 514         inp->inp_lport = lport;
 515         inp->inp_laddr.s_addr = laddr;
 516         inp->inp_faddr.s_addr = faddr;
 517         inp->inp_fport = fport;
 518         in_pcbrehash(inp);
 519
 520         if (anonport)
 521                 inp->inp_flags |= INP_ANONPORT;
 522         return (0);
 523 }
 524
 525 /*
 526  * Set up for a connect from a socket to the specified address.
 527  * On entry, *laddrp and *lportp should contain the current local
 528  * address and port for the PCB; these are updated to the values
 529  * that should be placed in inp_laddr and inp_lport to complete
 530  * the connect.
 531  *
 532  * On success, *faddrp and *fportp will be set to the remote address
 533  * and port. These are not updated in the error case.
 534  *
 535  * If the operation fails because the connection already exists,
 536  * *oinpp will be set to the PCB of that connection so that the
 537  * caller can decide to override it. In all other cases, *oinpp
 538  * is set to NULL.
 539  */
 540 int
 541 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 542     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 543     struct inpcb **oinpp, struct ucred *cred)
 544 {
 545         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 546         struct in_ifaddr *ia;
 547         struct sockaddr_in sa;
 548         struct ucred *socred;
 549         struct inpcb *oinp;
 550         struct in_addr laddr, faddr;
 551         u_short lport, fport;
 552         int error;
 553
 554         /*
 555          * Because a global state change doesn't actually occur here, a read
 556          * lock is sufficient.
 557          */
 558         INP_INFO_LOCK_ASSERT(inp->inp_pcbinfo);
 559         INP_LOCK_ASSERT(inp);
 560
 561         if (oinpp != NULL)
 562                 *oinpp = NULL;
 563         if (nam->sa_len != sizeof (*sin))
 564                 return (EINVAL);
 565         if (sin->sin_family != AF_INET)
 566                 return (EAFNOSUPPORT);
 567         if (sin->sin_port == 0)
 568                 return (EADDRNOTAVAIL);
 569         laddr.s_addr = *laddrp;
 570         lport = *lportp;
 571         faddr = sin->sin_addr;
 572         fport = sin->sin_port;
 573         socred = inp->inp_socket->so_cred;
 574         if (laddr.s_addr == INADDR_ANY && jailed(socred)) {
 575                 bzero(&sa, sizeof(sa));
 576                 sa.sin_addr.s_addr = htonl(prison_getip(socred));
 577                 sa.sin_len = sizeof(sa);
 578                 sa.sin_family = AF_INET;
 579                 error = in_pcbbind_setup(inp, (struct sockaddr *)&sa,
 580                     &laddr.s_addr, &lport, cred);
 581                 if (error)
 582                         return (error);
 583         }
 584         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 585                 /*
 586                  * If the destination address is INADDR_ANY,
 587                  * use the primary local address.
 588                  * If the supplied address is INADDR_BROADCAST,
 589                  * and the primary interface supports broadcast,
 590                  * choose the broadcast address for that interface.
 591                  */
 592                 if (faddr.s_addr == INADDR_ANY)
 593                         faddr = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr;
 594                 else if (faddr.s_addr == (u_long)INADDR_BROADCAST &&
 595                     (TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags &
 596                     IFF_BROADCAST))
 597                         faddr = satosin(&TAILQ_FIRST(
 598                             &in_ifaddrhead)->ia_broadaddr)->sin_addr;
 599         }
 600         if (laddr.s_addr == INADDR_ANY) {
 601                 ia = (struct in_ifaddr *)0;
 602                 /*
 603                  * If route is known our src addr is taken from the i/f,
 604                  * else punt.
 605                  *
 606                  * Find out route to destination
 607                  */
 608                 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 609                         ia = ip_rtaddr(faddr, inp->inp_inc.inc_fibnum);
 610                 /*
 611                  * If we found a route, use the address corresponding to
 612                  * the outgoing interface.
 613                  *
 614                  * Otherwise assume faddr is reachable on a directly connected
 615                  * network and try to find a corresponding interface to take
 616                  * the source address from.
 617                  */
 618                 if (ia == 0) {
 619                         bzero(&sa, sizeof(sa));
 620                         sa.sin_addr = faddr;
 621                         sa.sin_len = sizeof(sa);
 622                         sa.sin_family = AF_INET;
 623
 624                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sa)));
 625                         if (ia == 0)
 626                                 ia = ifatoia(ifa_ifwithnet(sintosa(&sa)));
 627                         if (ia == 0)
 628                                 return (ENETUNREACH);
 629                 }
 630                 /*
 631                  * If the destination address is multicast and an outgoing
 632                  * interface has been set as a multicast option, use the
 633                  * address of that interface as our source address.
 634                  */
 635                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
 636                     inp->inp_moptions != NULL) {
 637                         struct ip_moptions *imo;
 638                         struct ifnet *ifp;
 639
 640                         imo = inp->inp_moptions;
 641                         if (imo->imo_multicast_ifp != NULL) {
 642                                 ifp = imo->imo_multicast_ifp;
 643                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
 644                                         if (ia->ia_ifp == ifp)
 645                                                 break;
 646                                 if (ia == 0)
 647                                         return (EADDRNOTAVAIL);
 648                         }
 649                 }
 650                 laddr = ia->ia_addr.sin_addr;
 651         }
 652
 653         oinp = in_pcblookup_hash(inp->inp_pcbinfo, faddr, fport, laddr, lport,
 654             0, NULL);
 655         if (oinp != NULL) {
 656                 if (oinpp != NULL)
 657                         *oinpp = oinp;
 658                 return (EADDRINUSE);
 659         }
 660         if (lport == 0) {
 661                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
 662                     cred);
 663                 if (error)
 664                         return (error);
 665         }
 666         *laddrp = laddr.s_addr;
 667         *lportp = lport;
 668         *faddrp = faddr.s_addr;
 669         *fportp = fport;
 670         return (0);
 671 }
 672
 673 void
 674 in_pcbdisconnect(struct inpcb *inp)
 675 {
 676
 677         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 678         INP_WLOCK_ASSERT(inp);
 679
 680         inp->inp_faddr.s_addr = INADDR_ANY;
 681         inp->inp_fport = 0;
 682         in_pcbrehash(inp);
 683 }
 684
 685 /*
 686  * In the old world order, in_pcbdetach() served two functions: to detach the
 687  * pcb from the socket/potentially free the socket, and to free the pcb
 688  * itself.  In the new world order, the protocol code is responsible for
 689  * managing the relationship with the socket, and this code simply frees the
 690  * pcb.
 691  */
 692 void
 693 in_pcbdetach(struct inpcb *inp)
 694 {
 695
 696         KASSERT(inp->inp_socket != NULL, ("in_pcbdetach: inp_socket == NULL"));
 697         inp->inp_socket->so_pcb = NULL;
 698         inp->inp_socket = NULL;
 699 }
 700
 701 void
 702 in_pcbfree(struct inpcb *inp)
 703 {
 704         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 705
 706         KASSERT(inp->inp_socket == NULL, ("in_pcbfree: inp_socket != NULL"));
 707
 708         INP_INFO_WLOCK_ASSERT(ipi);
 709         INP_WLOCK_ASSERT(inp);
 710
 711 #ifdef IPSEC
 712         ipsec4_delete_pcbpolicy(inp);
 713 #endif /*IPSEC*/
 714         inp->inp_gencnt = ++ipi->ipi_gencnt;
 715         in_pcbremlists(inp);
 716         if (inp->inp_options)
 717                 (void)m_free(inp->inp_options);
 718         if (inp->inp_moptions != NULL)
 719                 inp_freemoptions(inp->inp_moptions);
 720         inp->inp_vflag = 0;
 721
 722 #ifdef MAC
 723         mac_inpcb_destroy(inp);
 724 #endif
 725         INP_WUNLOCK(inp);
 726         uma_zfree(ipi->ipi_zone, inp);
 727 }
 728
 729 /*
 730  * TCP needs to maintain its inpcb structure after the TCP connection has
 731  * been torn down.  However, it must be disconnected from the inpcb hashes as
 732  * it must not prevent binding of future connections to the same port/ip
 733  * combination by other inpcbs.
 734  */
 735 void
 736 in_pcbdrop(struct inpcb *inp)
 737 {
 738
 739         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 740         INP_WLOCK_ASSERT(inp);
 741
 742         inp->inp_vflag |= INP_DROPPED;
 743         if (inp->inp_lport) {
 744                 struct inpcbport *phd = inp->inp_phd;
 745
 746                 LIST_REMOVE(inp, inp_hash);
 747                 LIST_REMOVE(inp, inp_portlist);
 748                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 749                         LIST_REMOVE(phd, phd_hash);
 750                         free(phd, M_PCB);
 751                 }
 752                 inp->inp_lport = 0;
 753         }
 754 }
 755
 756 /*
 757  * Common routines to return the socket addresses associated with inpcbs.
 758  */
 759 struct sockaddr *
 760 in_sockaddr(in_port_t port, struct in_addr *addr_p)
 761 {
 762         struct sockaddr_in *sin;
 763
 764         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 765                 M_WAITOK | M_ZERO);
 766         sin->sin_family = AF_INET;
 767         sin->sin_len = sizeof(*sin);
 768         sin->sin_addr = *addr_p;
 769         sin->sin_port = port;
 770
 771         return (struct sockaddr *)sin;
 772 }
 773
 774 int
 775 in_getsockaddr(struct socket *so, struct sockaddr **nam)
 776 {
 777         struct inpcb *inp;
 778         struct in_addr addr;
 779         in_port_t port;
 780
 781         inp = sotoinpcb(so);
 782         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
 783
 784         INP_RLOCK(inp);
 785         port = inp->inp_lport;
 786         addr = inp->inp_laddr;
 787         INP_RUNLOCK(inp);
 788
 789         *nam = in_sockaddr(port, &addr);
 790         return 0;
 791 }
 792
 793 int
 794 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
 795 {
 796         struct inpcb *inp;
 797         struct in_addr addr;
 798         in_port_t port;
 799
 800         inp = sotoinpcb(so);
 801         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
 802
 803         INP_RLOCK(inp);
 804         port = inp->inp_fport;
 805         addr = inp->inp_faddr;
 806         INP_RUNLOCK(inp);
 807
 808         *nam = in_sockaddr(port, &addr);
 809         return 0;
 810 }
 811
 812 void
 813 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
 814     struct inpcb *(*notify)(struct inpcb *, int))
 815 {
 816         struct inpcb *inp, *inp_temp;
 817
 818         INP_INFO_WLOCK(pcbinfo);
 819         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
 820                 INP_WLOCK(inp);
 821 #ifdef INET6
 822                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 823                         INP_WUNLOCK(inp);
 824                         continue;
 825                 }
 826 #endif
 827                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 828                     inp->inp_socket == NULL) {
 829                         INP_WUNLOCK(inp);
 830                         continue;
 831                 }
 832                 if ((*notify)(inp, errno))
 833                         INP_WUNLOCK(inp);
 834         }
 835         INP_INFO_WUNLOCK(pcbinfo);
 836 }
 837
 838 void
 839 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 840 {
 841         struct inpcb *inp;
 842         struct ip_moptions *imo;
 843         int i, gap;
 844
 845         INP_INFO_RLOCK(pcbinfo);
 846         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
 847                 INP_WLOCK(inp);
 848                 imo = inp->inp_moptions;
 849                 if ((inp->inp_vflag & INP_IPV4) &&
 850                     imo != NULL) {
 851                         /*
 852                          * Unselect the outgoing interface if it is being
 853                          * detached.
 854                          */
 855                         if (imo->imo_multicast_ifp == ifp)
 856                                 imo->imo_multicast_ifp = NULL;
 857
 858                         /*
 859                          * Drop multicast group membership if we joined
 860                          * through the interface being detached.
 861                          */
 862                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 863                             i++) {
 864                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 865                                         in_delmulti(imo->imo_membership[i]);
 866                                         gap++;
 867                                 } else if (gap != 0)
 868                                         imo->imo_membership[i - gap] =
 869                                             imo->imo_membership[i];
 870                         }
 871                         imo->imo_num_memberships -= gap;
 872                 }
 873                 INP_WUNLOCK(inp);
 874         }
 875         INP_INFO_RUNLOCK(pcbinfo);
 876 }
 877
 878 /*
 879  * Lookup a PCB based on the local address and port.
 880  */
 881 #define INP_LOOKUP_MAPPED_PCB_COST      3
 882 struct inpcb *
 883 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 884     u_int lport_arg, int wild_okay)
 885 {
 886         struct inpcb *inp;
 887 #ifdef INET6
 888         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
 889 #else
 890         int matchwild = 3;
 891 #endif
 892         int wildcard;
 893         u_short lport = lport_arg;
 894
 895         INP_INFO_LOCK_ASSERT(pcbinfo);
 896
 897         if (!wild_okay) {
 898                 struct inpcbhead *head;
 899                 /*
 900                  * Look for an unconnected (wildcard foreign addr) PCB that
 901                  * matches the local address and port we're looking for.
 902                  */
 903                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 904                     0, pcbinfo->ipi_hashmask)];
 905                 LIST_FOREACH(inp, head, inp_hash) {
 906 #ifdef INET6
 907                         if ((inp->inp_vflag & INP_IPV4) == 0)
 908                                 continue;
 909 #endif
 910                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 911                             inp->inp_laddr.s_addr == laddr.s_addr &&
 912                             inp->inp_lport == lport) {
 913                                 /*
 914                                  * Found.
 915                                  */
 916                                 return (inp);
 917                         }
 918                 }
 919                 /*
 920                  * Not found.
 921                  */
 922                 return (NULL);
 923         } else {
 924                 struct inpcbporthead *porthash;
 925                 struct inpcbport *phd;
 926                 struct inpcb *match = NULL;
 927                 /*
 928                  * Best fit PCB lookup.
 929                  *
 930                  * First see if this local port is in use by looking on the
 931                  * port hash list.
 932                  */
 933                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 934                     pcbinfo->ipi_porthashmask)];
 935                 LIST_FOREACH(phd, porthash, phd_hash) {
 936                         if (phd->phd_port == lport)
 937                                 break;
 938                 }
 939                 if (phd != NULL) {
 940                         /*
 941                          * Port is in use by one or more PCBs. Look for best
 942                          * fit.
 943                          */
 944                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 945                                 wildcard = 0;
 946 #ifdef INET6
 947                                 if ((inp->inp_vflag & INP_IPV4) == 0)
 948                                         continue;
 949                                 /*
 950                                  * We never select the PCB that has
 951                                  * INP_IPV6 flag and is bound to :: if
 952                                  * we have another PCB which is bound
 953                                  * to 0.0.0.0.  If a PCB has the
 954                                  * INP_IPV6 flag, then we set its cost
 955                                  * higher than IPv4 only PCBs.
 956                                  *
 957                                  * Note that the case only happens
 958                                  * when a socket is bound to ::, under
 959                                  * the condition that the use of the
 960                                  * mapped address is allowed.
 961                                  */
 962                                 if ((inp->inp_vflag & INP_IPV6) != 0)
 963                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
 964 #endif
 965                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
 966                                         wildcard++;
 967                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
 968                                         if (laddr.s_addr == INADDR_ANY)
 969                                                 wildcard++;
 970                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
 971                                                 continue;
 972                                 } else {
 973                                         if (laddr.s_addr != INADDR_ANY)
 974                                                 wildcard++;
 975                                 }
 976                                 if (wildcard < matchwild) {
 977                                         match = inp;
 978                                         matchwild = wildcard;
 979                                         if (matchwild == 0) {
 980                                                 break;
 981                                         }
 982                                 }
 983                         }
 984                 }
 985                 return (match);
 986         }
 987 }
 988 #undef INP_LOOKUP_MAPPED_PCB_COST
 989
 990 /*
 991  * Lookup PCB in hash list.
 992  */
 993 struct inpcb *
 994 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
 995     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int wildcard,
 996     struct ifnet *ifp)
 997 {
 998         struct inpcbhead *head;
 999         struct inpcb *inp;
1000         u_short fport = fport_arg, lport = lport_arg;
1001
1002         INP_INFO_LOCK_ASSERT(pcbinfo);
1003
1004         /*
1005          * First look for an exact match.
1006          */
1007         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1008             pcbinfo->ipi_hashmask)];
1009         LIST_FOREACH(inp, head, inp_hash) {
1010 #ifdef INET6
1011                 if ((inp->inp_vflag & INP_IPV4) == 0)
1012                         continue;
1013 #endif
1014                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1015                     inp->inp_laddr.s_addr == laddr.s_addr &&
1016                     inp->inp_fport == fport &&
1017                     inp->inp_lport == lport)
1018                         return (inp);
1019         }
1020
1021         /*
1022          * Then look for a wildcard match, if requested.
1023          */
1024         if (wildcard) {
1025                 struct inpcb *local_wild = NULL;
1026 #ifdef INET6
1027                 struct inpcb *local_wild_mapped = NULL;
1028 #endif
1029
1030                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1031                     0, pcbinfo->ipi_hashmask)];
1032                 LIST_FOREACH(inp, head, inp_hash) {
1033 #ifdef INET6
1034                         if ((inp->inp_vflag & INP_IPV4) == 0)
1035                                 continue;
1036 #endif
1037                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1038                             inp->inp_lport == lport) {
1039                                 if (ifp && ifp->if_type == IFT_FAITH &&
1040                                     (inp->inp_flags & INP_FAITH) == 0)
1041                                         continue;
1042                                 if (inp->inp_laddr.s_addr == laddr.s_addr)
1043                                         return (inp);
1044                                 else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1045 #ifdef INET6
1046                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
1047                                                              AF_INET6))
1048                                                 local_wild_mapped = inp;
1049                                         else
1050 #endif
1051                                                 local_wild = inp;
1052                                 }
1053                         }
1054                 }
1055 #ifdef INET6
1056                 if (local_wild == NULL)
1057                         return (local_wild_mapped);
1058 #endif
1059                 return (local_wild);
1060         }
1061         return (NULL);
1062 }
1063
1064 /*
1065  * Insert PCB onto various hash lists.
1066  */
1067 int
1068 in_pcbinshash(struct inpcb *inp)
1069 {
1070         struct inpcbhead *pcbhash;
1071         struct inpcbporthead *pcbporthash;
1072         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1073         struct inpcbport *phd;
1074         u_int32_t hashkey_faddr;
1075
1076         INP_INFO_WLOCK_ASSERT(pcbinfo);
1077         INP_WLOCK_ASSERT(inp);
1078
1079 #ifdef INET6
1080         if (inp->inp_vflag & INP_IPV6)
1081                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1082         else
1083 #endif /* INET6 */
1084         hashkey_faddr = inp->inp_faddr.s_addr;
1085
1086         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1087                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1088
1089         pcbporthash = &pcbinfo->ipi_porthashbase[
1090             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
1091
1092         /*
1093          * Go through port list and look for a head for this lport.
1094          */
1095         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1096                 if (phd->phd_port == inp->inp_lport)
1097                         break;
1098         }
1099         /*
1100          * If none exists, malloc one and tack it on.
1101          */
1102         if (phd == NULL) {
1103                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1104                 if (phd == NULL) {
1105                         return (ENOBUFS); /* XXX */
1106                 }
1107                 phd->phd_port = inp->inp_lport;
1108                 LIST_INIT(&phd->phd_pcblist);
1109                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1110         }
1111         inp->inp_phd = phd;
1112         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1113         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1114         return (0);
1115 }
1116
1117 /*
1118  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1119  * changed. NOTE: This does not handle the case of the lport changing (the
1120  * hashed port list would have to be updated as well), so the lport must
1121  * not change after in_pcbinshash() has been called.
1122  */
1123 void
1124 in_pcbrehash(struct inpcb *inp)
1125 {
1126         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1127         struct inpcbhead *head;
1128         u_int32_t hashkey_faddr;
1129
1130         INP_INFO_WLOCK_ASSERT(pcbinfo);
1131         INP_WLOCK_ASSERT(inp);
1132
1133 #ifdef INET6
1134         if (inp->inp_vflag & INP_IPV6)
1135                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1136         else
1137 #endif /* INET6 */
1138         hashkey_faddr = inp->inp_faddr.s_addr;
1139
1140         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1141                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1142
1143         LIST_REMOVE(inp, inp_hash);
1144         LIST_INSERT_HEAD(head, inp, inp_hash);
1145 }
1146
1147 /*
1148  * Remove PCB from various lists.
1149  */
1150 void
1151 in_pcbremlists(struct inpcb *inp)
1152 {
1153         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1154
1155         INP_INFO_WLOCK_ASSERT(pcbinfo);
1156         INP_WLOCK_ASSERT(inp);
1157
1158         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1159         if (inp->inp_lport) {
1160                 struct inpcbport *phd = inp->inp_phd;
1161
1162                 LIST_REMOVE(inp, inp_hash);
1163                 LIST_REMOVE(inp, inp_portlist);
1164                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1165                         LIST_REMOVE(phd, phd_hash);
1166                         free(phd, M_PCB);
1167                 }
1168         }
1169         LIST_REMOVE(inp, inp_list);
1170         pcbinfo->ipi_count--;
1171 }
1172
1173 /*
1174  * A set label operation has occurred at the socket layer, propagate the
1175  * label change into the in_pcb for the socket.
1176  */
1177 void
1178 in_pcbsosetlabel(struct socket *so)
1179 {
1180 #ifdef MAC
1181         struct inpcb *inp;
1182
1183         inp = sotoinpcb(so);
1184         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
1185
1186         INP_WLOCK(inp);
1187         SOCK_LOCK(so);
1188         mac_inpcb_sosetlabel(so, inp);
1189         SOCK_UNLOCK(so);
1190         INP_WUNLOCK(inp);
1191 #endif
1192 }
1193
1194 /*
1195  * ipport_tick runs once per second, determining if random port allocation
1196  * should be continued.  If more than ipport_randomcps ports have been
1197  * allocated in the last second, then we return to sequential port
1198  * allocation. We return to random allocation only once we drop below
1199  * ipport_randomcps for at least ipport_randomtime seconds.
1200  */
1201 void
1202 ipport_tick(void *xtp)
1203 {
1204
1205         if (ipport_tcpallocs <= ipport_tcplastcount + ipport_randomcps) {
1206                 if (ipport_stoprandom > 0)
1207                         ipport_stoprandom--;
1208         } else
1209                 ipport_stoprandom = ipport_randomtime;
1210         ipport_tcplastcount = ipport_tcpallocs;
1211         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
1212 }
1213
1214 void
1215 inp_wlock(struct inpcb *inp)
1216 {
1217
1218         INP_WLOCK(inp);
1219 }
1220
1221 void
1222 inp_wunlock(struct inpcb *inp)
1223 {
1224
1225         INP_WUNLOCK(inp);
1226 }
1227
1228 void
1229 inp_rlock(struct inpcb *inp)
1230 {
1231
1232         INP_RLOCK(inp);
1233 }
1234
1235 void
1236 inp_runlock(struct inpcb *inp)
1237 {
1238
1239         INP_RUNLOCK(inp);
1240 }
1241
1242 #ifdef INVARIANTS
1243 void
1244 inp_lock_assert(struct inpcb *inp)
1245 {
1246
1247         INP_WLOCK_ASSERT(inp);
1248 }
1249
1250 void
1251 inp_unlock_assert(struct inpcb *inp)
1252 {
1253
1254         INP_UNLOCK_ASSERT(inp);
1255 }
1256 #endif
1257
1258 #ifdef DDB
1259 static void
1260 db_print_indent(int indent)
1261 {
1262         int i;
1263
1264         for (i = 0; i < indent; i++)
1265                 db_printf(" ");
1266 }
1267
1268 static void
1269 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
1270 {
1271         char faddr_str[48], laddr_str[48];
1272
1273         db_print_indent(indent);
1274         db_printf("%s at %p\n", name, inc);
1275
1276         indent += 2;
1277
1278 #ifdef INET6
1279         if (inc->inc_flags == 1) {
1280                 /* IPv6. */
1281                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
1282                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
1283         } else {
1284 #endif
1285                 /* IPv4. */
1286                 inet_ntoa_r(inc->inc_laddr, laddr_str);
1287                 inet_ntoa_r(inc->inc_faddr, faddr_str);
1288 #ifdef INET6
1289         }
1290 #endif
1291         db_print_indent(indent);
1292         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
1293             ntohs(inc->inc_lport));
1294         db_print_indent(indent);
1295         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
1296             ntohs(inc->inc_fport));
1297 }
1298
1299 static void
1300 db_print_inpflags(int inp_flags)
1301 {
1302         int comma;
1303
1304         comma = 0;
1305         if (inp_flags & INP_RECVOPTS) {
1306                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
1307                 comma = 1;
1308         }
1309         if (inp_flags & INP_RECVRETOPTS) {
1310                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
1311                 comma = 1;
1312         }
1313         if (inp_flags & INP_RECVDSTADDR) {
1314                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
1315                 comma = 1;
1316         }
1317         if (inp_flags & INP_HDRINCL) {
1318                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
1319                 comma = 1;
1320         }
1321         if (inp_flags & INP_HIGHPORT) {
1322                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
1323                 comma = 1;
1324         }
1325         if (inp_flags & INP_LOWPORT) {
1326                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
1327                 comma = 1;
1328         }
1329         if (inp_flags & INP_ANONPORT) {
1330                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
1331                 comma = 1;
1332         }
1333         if (inp_flags & INP_RECVIF) {
1334                 db_printf("%sINP_RECVIF", comma ? ", " : "");
1335                 comma = 1;
1336         }
1337         if (inp_flags & INP_MTUDISC) {
1338                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
1339                 comma = 1;
1340         }
1341         if (inp_flags & INP_FAITH) {
1342                 db_printf("%sINP_FAITH", comma ? ", " : "");
1343                 comma = 1;
1344         }
1345         if (inp_flags & INP_RECVTTL) {
1346                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
1347                 comma = 1;
1348         }
1349         if (inp_flags & INP_DONTFRAG) {
1350                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
1351                 comma = 1;
1352         }
1353         if (inp_flags & IN6P_IPV6_V6ONLY) {
1354                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
1355                 comma = 1;
1356         }
1357         if (inp_flags & IN6P_PKTINFO) {
1358                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
1359                 comma = 1;
1360         }
1361         if (inp_flags & IN6P_HOPLIMIT) {
1362                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
1363                 comma = 1;
1364         }
1365         if (inp_flags & IN6P_HOPOPTS) {
1366                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
1367                 comma = 1;
1368         }
1369         if (inp_flags & IN6P_DSTOPTS) {
1370                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
1371                 comma = 1;
1372         }
1373         if (inp_flags & IN6P_RTHDR) {
1374                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
1375                 comma = 1;
1376         }
1377         if (inp_flags & IN6P_RTHDRDSTOPTS) {
1378                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
1379                 comma = 1;
1380         }
1381         if (inp_flags & IN6P_TCLASS) {
1382                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
1383                 comma = 1;
1384         }
1385         if (inp_flags & IN6P_AUTOFLOWLABEL) {
1386                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
1387                 comma = 1;
1388         }
1389         if (inp_flags & IN6P_RFC2292) {
1390                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
1391                 comma = 1;
1392         }
1393         if (inp_flags & IN6P_MTU) {
1394                 db_printf("IN6P_MTU%s", comma ? ", " : "");
1395                 comma = 1;
1396         }
1397 }
1398
1399 static void
1400 db_print_inpvflag(u_char inp_vflag)
1401 {
1402         int comma;
1403
1404         comma = 0;
1405         if (inp_vflag & INP_IPV4) {
1406                 db_printf("%sINP_IPV4", comma ? ", " : "");
1407                 comma  = 1;
1408         }
1409         if (inp_vflag & INP_IPV6) {
1410                 db_printf("%sINP_IPV6", comma ? ", " : "");
1411                 comma  = 1;
1412         }
1413         if (inp_vflag & INP_IPV6PROTO) {
1414                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
1415                 comma  = 1;
1416         }
1417         if (inp_vflag & INP_TIMEWAIT) {
1418                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
1419                 comma  = 1;
1420         }
1421         if (inp_vflag & INP_ONESBCAST) {
1422                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
1423                 comma  = 1;
1424         }
1425         if (inp_vflag & INP_DROPPED) {
1426                 db_printf("%sINP_DROPPED", comma ? ", " : "");
1427                 comma  = 1;
1428         }
1429         if (inp_vflag & INP_SOCKREF) {
1430                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
1431                 comma  = 1;
1432         }
1433 }
1434
1435 void
1436 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
1437 {
1438
1439         db_print_indent(indent);
1440         db_printf("%s at %p\n", name, inp);
1441
1442         indent += 2;
1443
1444         db_print_indent(indent);
1445         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
1446
1447         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
1448
1449         db_print_indent(indent);
1450         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
1451             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
1452
1453         db_print_indent(indent);
1454         db_printf("inp_label: %p   inp_flags: 0x%x (",
1455            inp->inp_label, inp->inp_flags);
1456         db_print_inpflags(inp->inp_flags);
1457         db_printf(")\n");
1458
1459         db_print_indent(indent);
1460         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
1461             inp->inp_vflag);
1462         db_print_inpvflag(inp->inp_vflag);
1463         db_printf(")\n");
1464
1465         db_print_indent(indent);
1466         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
1467             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
1468
1469         db_print_indent(indent);
1470 #ifdef INET6
1471         if (inp->inp_vflag & INP_IPV6) {
1472                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
1473                     "in6p_moptions: %p\n", inp->in6p_options,
1474                     inp->in6p_outputopts, inp->in6p_moptions);
1475                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
1476                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
1477                     inp->in6p_hops);
1478         } else
1479 #endif
1480         {
1481                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
1482                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
1483                     inp->inp_options, inp->inp_moptions);
1484         }
1485
1486         db_print_indent(indent);
1487         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
1488             (uintmax_t)inp->inp_gencnt);
1489 }
1490
1491 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
1492 {
1493         struct inpcb *inp;
1494
1495         if (!have_addr) {
1496                 db_printf("usage: show inpcb <addr>\n");
1497                 return;
1498         }
1499         inp = (struct inpcb *)addr;
1500
1501         db_print_inpcb(inp, "inpcb", 0);
1502 }
1503 #endif