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