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 #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, aux;
 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                 if (first > last) {
 445                         aux = first;
 446                         first = last;
 447                         last = aux;
 448                 }
 449
 450                 if (dorandom)
 451                         *lastport = first +
 452                                     (arc4random() % (last - first));
 453
 454                 count = last - first;
 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         }
 466         if (prison_ip(cred, 0, &laddr.s_addr))
 467                 return (EINVAL);
 468         *laddrp = laddr.s_addr;
 469         *lportp = lport;
 470         return (0);
 471 }
 472
 473 /*
 474  * Connect from a socket to a specified address.
 475  * Both address and port must be specified in argument sin.
 476  * If don't have a local address for this socket yet,
 477  * then pick one.
 478  */
 479 int
 480 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 481 {
 482         u_short lport, fport;
 483         in_addr_t laddr, faddr;
 484         int anonport, error;
 485
 486         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 487         INP_LOCK_ASSERT(inp);
 488
 489         lport = inp->inp_lport;
 490         laddr = inp->inp_laddr.s_addr;
 491         anonport = (lport == 0);
 492         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 493             NULL, cred);
 494         if (error)
 495                 return (error);
 496
 497         /* Do the initial binding of the local address if required. */
 498         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 499                 inp->inp_lport = lport;
 500                 inp->inp_laddr.s_addr = laddr;
 501                 if (in_pcbinshash(inp) != 0) {
 502                         inp->inp_laddr.s_addr = INADDR_ANY;
 503                         inp->inp_lport = 0;
 504                         return (EAGAIN);
 505                 }
 506         }
 507
 508         /* Commit the remaining changes. */
 509         inp->inp_lport = lport;
 510         inp->inp_laddr.s_addr = laddr;
 511         inp->inp_faddr.s_addr = faddr;
 512         inp->inp_fport = fport;
 513         in_pcbrehash(inp);
 514
 515         if (anonport)
 516                 inp->inp_flags |= INP_ANONPORT;
 517         return (0);
 518 }
 519
 520 /*
 521  * Set up for a connect from a socket to the specified address.
 522  * On entry, *laddrp and *lportp should contain the current local
 523  * address and port for the PCB; these are updated to the values
 524  * that should be placed in inp_laddr and inp_lport to complete
 525  * the connect.
 526  *
 527  * On success, *faddrp and *fportp will be set to the remote address
 528  * and port. These are not updated in the error case.
 529  *
 530  * If the operation fails because the connection already exists,
 531  * *oinpp will be set to the PCB of that connection so that the
 532  * caller can decide to override it. In all other cases, *oinpp
 533  * is set to NULL.
 534  */
 535 int
 536 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 537     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 538     struct inpcb **oinpp, struct ucred *cred)
 539 {
 540         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 541         struct in_ifaddr *ia;
 542         struct sockaddr_in sa;
 543         struct ucred *socred;
 544         struct inpcb *oinp;
 545         struct in_addr laddr, faddr;
 546         u_short lport, fport;
 547         int error;
 548
 549         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 550         INP_LOCK_ASSERT(inp);
 551
 552         if (oinpp != NULL)
 553                 *oinpp = NULL;
 554         if (nam->sa_len != sizeof (*sin))
 555                 return (EINVAL);
 556         if (sin->sin_family != AF_INET)
 557                 return (EAFNOSUPPORT);
 558         if (sin->sin_port == 0)
 559                 return (EADDRNOTAVAIL);
 560         laddr.s_addr = *laddrp;
 561         lport = *lportp;
 562         faddr = sin->sin_addr;
 563         fport = sin->sin_port;
 564         socred = inp->inp_socket->so_cred;
 565         if (laddr.s_addr == INADDR_ANY && jailed(socred)) {
 566                 bzero(&sa, sizeof(sa));
 567                 sa.sin_addr.s_addr = htonl(prison_getip(socred));
 568                 sa.sin_len = sizeof(sa);
 569                 sa.sin_family = AF_INET;
 570                 error = in_pcbbind_setup(inp, (struct sockaddr *)&sa,
 571                     &laddr.s_addr, &lport, cred);
 572                 if (error)
 573                         return (error);
 574         }
 575         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
 576                 /*
 577                  * If the destination address is INADDR_ANY,
 578                  * use the primary local address.
 579                  * If the supplied address is INADDR_BROADCAST,
 580                  * and the primary interface supports broadcast,
 581                  * choose the broadcast address for that interface.
 582                  */
 583                 if (faddr.s_addr == INADDR_ANY)
 584                         faddr = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr;
 585                 else if (faddr.s_addr == (u_long)INADDR_BROADCAST &&
 586                     (TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags &
 587                     IFF_BROADCAST))
 588                         faddr = satosin(&TAILQ_FIRST(
 589                             &in_ifaddrhead)->ia_broadaddr)->sin_addr;
 590         }
 591         if (laddr.s_addr == INADDR_ANY) {
 592                 ia = (struct in_ifaddr *)0;
 593                 /*
 594                  * If route is known our src addr is taken from the i/f,
 595                  * else punt.
 596                  *
 597                  * Find out route to destination
 598                  */
 599                 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 600                         ia = ip_rtaddr(faddr);
 601                 /*
 602                  * If we found a route, use the address corresponding to
 603                  * the outgoing interface.
 604                  *
 605                  * Otherwise assume faddr is reachable on a directly connected
 606                  * network and try to find a corresponding interface to take
 607                  * the source address from.
 608                  */
 609                 if (ia == 0) {
 610                         bzero(&sa, sizeof(sa));
 611                         sa.sin_addr = faddr;
 612                         sa.sin_len = sizeof(sa);
 613                         sa.sin_family = AF_INET;
 614
 615                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sa)));
 616                         if (ia == 0)
 617                                 ia = ifatoia(ifa_ifwithnet(sintosa(&sa)));
 618                         if (ia == 0)
 619                                 return (ENETUNREACH);
 620                 }
 621                 /*
 622                  * If the destination address is multicast and an outgoing
 623                  * interface has been set as a multicast option, use the
 624                  * address of that interface as our source address.
 625                  */
 626                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
 627                     inp->inp_moptions != NULL) {
 628                         struct ip_moptions *imo;
 629                         struct ifnet *ifp;
 630
 631                         imo = inp->inp_moptions;
 632                         if (imo->imo_multicast_ifp != NULL) {
 633                                 ifp = imo->imo_multicast_ifp;
 634                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
 635                                         if (ia->ia_ifp == ifp)
 636                                                 break;
 637                                 if (ia == 0)
 638                                         return (EADDRNOTAVAIL);
 639                         }
 640                 }
 641                 laddr = ia->ia_addr.sin_addr;
 642         }
 643
 644         oinp = in_pcblookup_hash(inp->inp_pcbinfo, faddr, fport, laddr, lport,
 645             0, NULL);
 646         if (oinp != NULL) {
 647                 if (oinpp != NULL)
 648                         *oinpp = oinp;
 649                 return (EADDRINUSE);
 650         }
 651         if (lport == 0) {
 652                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
 653                     cred);
 654                 if (error)
 655                         return (error);
 656         }
 657         *laddrp = laddr.s_addr;
 658         *lportp = lport;
 659         *faddrp = faddr.s_addr;
 660         *fportp = fport;
 661         return (0);
 662 }
 663
 664 void
 665 in_pcbdisconnect(struct inpcb *inp)
 666 {
 667
 668         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 669         INP_LOCK_ASSERT(inp);
 670
 671         inp->inp_faddr.s_addr = INADDR_ANY;
 672         inp->inp_fport = 0;
 673         in_pcbrehash(inp);
 674 }
 675
 676 /*
 677  * In the old world order, in_pcbdetach() served two functions: to detach the
 678  * pcb from the socket/potentially free the socket, and to free the pcb
 679  * itself.  In the new world order, the protocol code is responsible for
 680  * managing the relationship with the socket, and this code simply frees the
 681  * pcb.
 682  */
 683 void
 684 in_pcbdetach(struct inpcb *inp)
 685 {
 686
 687         KASSERT(inp->inp_socket != NULL, ("in_pcbdetach: inp_socket == NULL"));
 688         inp->inp_socket->so_pcb = NULL;
 689         inp->inp_socket = NULL;
 690 }
 691
 692 void
 693 in_pcbfree(struct inpcb *inp)
 694 {
 695         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 696
 697         KASSERT(inp->inp_socket == NULL, ("in_pcbfree: inp_socket != NULL"));
 698         INP_INFO_WLOCK_ASSERT(ipi);
 699         INP_LOCK_ASSERT(inp);
 700
 701 #ifdef IPSEC
 702         ipsec4_delete_pcbpolicy(inp);
 703 #endif /*IPSEC*/
 704         inp->inp_gencnt = ++ipi->ipi_gencnt;
 705         in_pcbremlists(inp);
 706         if (inp->inp_options)
 707                 (void)m_free(inp->inp_options);
 708         if (inp->inp_moptions != NULL)
 709                 inp_freemoptions(inp->inp_moptions);
 710         inp->inp_vflag = 0;
 711
 712 #ifdef MAC
 713         mac_inpcb_destroy(inp);
 714 #endif
 715         INP_UNLOCK(inp);
 716         uma_zfree(ipi->ipi_zone, inp);
 717 }
 718
 719 /*
 720  * TCP needs to maintain its inpcb structure after the TCP connection has
 721  * been torn down.  However, it must be disconnected from the inpcb hashes as
 722  * it must not prevent binding of future connections to the same port/ip
 723  * combination by other inpcbs.
 724  */
 725 void
 726 in_pcbdrop(struct inpcb *inp)
 727 {
 728
 729         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 730         INP_LOCK_ASSERT(inp);
 731
 732         inp->inp_vflag |= INP_DROPPED;
 733         if (inp->inp_lport) {
 734                 struct inpcbport *phd = inp->inp_phd;
 735
 736                 LIST_REMOVE(inp, inp_hash);
 737                 LIST_REMOVE(inp, inp_portlist);
 738                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 739                         LIST_REMOVE(phd, phd_hash);
 740                         free(phd, M_PCB);
 741                 }
 742                 inp->inp_lport = 0;
 743         }
 744 }
 745
 746 /*
 747  * Common routines to return the socket addresses associated with inpcbs.
 748  */
 749 struct sockaddr *
 750 in_sockaddr(in_port_t port, struct in_addr *addr_p)
 751 {
 752         struct sockaddr_in *sin;
 753
 754         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
 755                 M_WAITOK | M_ZERO);
 756         sin->sin_family = AF_INET;
 757         sin->sin_len = sizeof(*sin);
 758         sin->sin_addr = *addr_p;
 759         sin->sin_port = port;
 760
 761         return (struct sockaddr *)sin;
 762 }
 763
 764 int
 765 in_getsockaddr(struct socket *so, struct sockaddr **nam)
 766 {
 767         struct inpcb *inp;
 768         struct in_addr addr;
 769         in_port_t port;
 770
 771         inp = sotoinpcb(so);
 772         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
 773
 774         INP_LOCK(inp);
 775         port = inp->inp_lport;
 776         addr = inp->inp_laddr;
 777         INP_UNLOCK(inp);
 778
 779         *nam = in_sockaddr(port, &addr);
 780         return 0;
 781 }
 782
 783 int
 784 in_getpeeraddr(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_getpeeraddr: inp == NULL"));
 792
 793         INP_LOCK(inp);
 794         port = inp->inp_fport;
 795         addr = inp->inp_faddr;
 796         INP_UNLOCK(inp);
 797
 798         *nam = in_sockaddr(port, &addr);
 799         return 0;
 800 }
 801
 802 void
 803 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
 804     struct inpcb *(*notify)(struct inpcb *, int))
 805 {
 806         struct inpcb *inp, *ninp;
 807         struct inpcbhead *head;
 808
 809         INP_INFO_WLOCK(pcbinfo);
 810         head = pcbinfo->ipi_listhead;
 811         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 812                 INP_LOCK(inp);
 813                 ninp = LIST_NEXT(inp, inp_list);
 814 #ifdef INET6
 815                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 816                         INP_UNLOCK(inp);
 817                         continue;
 818                 }
 819 #endif
 820                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 821                     inp->inp_socket == NULL) {
 822                         INP_UNLOCK(inp);
 823                         continue;
 824                 }
 825                 if ((*notify)(inp, errno))
 826                         INP_UNLOCK(inp);
 827         }
 828         INP_INFO_WUNLOCK(pcbinfo);
 829 }
 830
 831 void
 832 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 833 {
 834         struct inpcb *inp;
 835         struct ip_moptions *imo;
 836         int i, gap;
 837
 838         INP_INFO_RLOCK(pcbinfo);
 839         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
 840                 INP_LOCK(inp);
 841                 imo = inp->inp_moptions;
 842                 if ((inp->inp_vflag & INP_IPV4) &&
 843                     imo != NULL) {
 844                         /*
 845                          * Unselect the outgoing interface if it is being
 846                          * detached.
 847                          */
 848                         if (imo->imo_multicast_ifp == ifp)
 849                                 imo->imo_multicast_ifp = NULL;
 850
 851                         /*
 852                          * Drop multicast group membership if we joined
 853                          * through the interface being detached.
 854                          */
 855                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 856                             i++) {
 857                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 858                                         in_delmulti(imo->imo_membership[i]);
 859                                         gap++;
 860                                 } else if (gap != 0)
 861                                         imo->imo_membership[i - gap] =
 862                                             imo->imo_membership[i];
 863                         }
 864                         imo->imo_num_memberships -= gap;
 865                 }
 866                 INP_UNLOCK(inp);
 867         }
 868         INP_INFO_RUNLOCK(pcbinfo);
 869 }
 870
 871 /*
 872  * Lookup a PCB based on the local address and port.
 873  */
 874 #define INP_LOOKUP_MAPPED_PCB_COST      3
 875 struct inpcb *
 876 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 877     u_int lport_arg, int wild_okay)
 878 {
 879         struct inpcb *inp;
 880 #ifdef INET6
 881         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
 882 #else
 883         int matchwild = 3;
 884 #endif
 885         int wildcard;
 886         u_short lport = lport_arg;
 887
 888         INP_INFO_WLOCK_ASSERT(pcbinfo);
 889
 890         if (!wild_okay) {
 891                 struct inpcbhead *head;
 892                 /*
 893                  * Look for an unconnected (wildcard foreign addr) PCB that
 894                  * matches the local address and port we're looking for.
 895                  */
 896                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 897                     0, pcbinfo->ipi_hashmask)];
 898                 LIST_FOREACH(inp, head, inp_hash) {
 899 #ifdef INET6
 900                         if ((inp->inp_vflag & INP_IPV4) == 0)
 901                                 continue;
 902 #endif
 903                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 904                             inp->inp_laddr.s_addr == laddr.s_addr &&
 905                             inp->inp_lport == lport) {
 906                                 /*
 907                                  * Found.
 908                                  */
 909                                 return (inp);
 910                         }
 911                 }
 912                 /*
 913                  * Not found.
 914                  */
 915                 return (NULL);
 916         } else {
 917                 struct inpcbporthead *porthash;
 918                 struct inpcbport *phd;
 919                 struct inpcb *match = NULL;
 920                 /*
 921                  * Best fit PCB lookup.
 922                  *
 923                  * First see if this local port is in use by looking on the
 924                  * port hash list.
 925                  */
 926                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 927                     pcbinfo->ipi_porthashmask)];
 928                 LIST_FOREACH(phd, porthash, phd_hash) {
 929                         if (phd->phd_port == lport)
 930                                 break;
 931                 }
 932                 if (phd != NULL) {
 933                         /*
 934                          * Port is in use by one or more PCBs. Look for best
 935                          * fit.
 936                          */
 937                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 938                                 wildcard = 0;
 939 #ifdef INET6
 940                                 if ((inp->inp_vflag & INP_IPV4) == 0)
 941                                         continue;
 942                                 /*
 943                                  * We never select the PCB that has
 944                                  * INP_IPV6 flag and is bound to :: if
 945                                  * we have another PCB which is bound
 946                                  * to 0.0.0.0.  If a PCB has the
 947                                  * INP_IPV6 flag, then we set its cost
 948                                  * higher than IPv4 only PCBs.
 949                                  *
 950                                  * Note that the case only happens
 951                                  * when a socket is bound to ::, under
 952                                  * the condition that the use of the
 953                                  * mapped address is allowed.
 954                                  */
 955                                 if ((inp->inp_vflag & INP_IPV6) != 0)
 956                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
 957 #endif
 958                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
 959                                         wildcard++;
 960                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
 961                                         if (laddr.s_addr == INADDR_ANY)
 962                                                 wildcard++;
 963                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
 964                                                 continue;
 965                                 } else {
 966                                         if (laddr.s_addr != INADDR_ANY)
 967                                                 wildcard++;
 968                                 }
 969                                 if (wildcard < matchwild) {
 970                                         match = inp;
 971                                         matchwild = wildcard;
 972                                         if (matchwild == 0) {
 973                                                 break;
 974                                         }
 975                                 }
 976                         }
 977                 }
 978                 return (match);
 979         }
 980 }
 981 #undef INP_LOOKUP_MAPPED_PCB_COST
 982
 983 /*
 984  * Lookup PCB in hash list.
 985  */
 986 struct inpcb *
 987 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
 988     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int wildcard,
 989     struct ifnet *ifp)
 990 {
 991         struct inpcbhead *head;
 992         struct inpcb *inp;
 993         u_short fport = fport_arg, lport = lport_arg;
 994
 995         INP_INFO_RLOCK_ASSERT(pcbinfo);
 996
 997         /*
 998          * First look for an exact match.
 999          */
1000         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1001             pcbinfo->ipi_hashmask)];
1002         LIST_FOREACH(inp, head, inp_hash) {
1003 #ifdef INET6
1004                 if ((inp->inp_vflag & INP_IPV4) == 0)
1005                         continue;
1006 #endif
1007                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1008                     inp->inp_laddr.s_addr == laddr.s_addr &&
1009                     inp->inp_fport == fport &&
1010                     inp->inp_lport == lport)
1011                         return (inp);
1012         }
1013
1014         /*
1015          * Then look for a wildcard match, if requested.
1016          */
1017         if (wildcard) {
1018                 struct inpcb *local_wild = NULL;
1019 #ifdef INET6
1020                 struct inpcb *local_wild_mapped = NULL;
1021 #endif
1022
1023                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1024                     0, pcbinfo->ipi_hashmask)];
1025                 LIST_FOREACH(inp, head, inp_hash) {
1026 #ifdef INET6
1027                         if ((inp->inp_vflag & INP_IPV4) == 0)
1028                                 continue;
1029 #endif
1030                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1031                             inp->inp_lport == lport) {
1032                                 if (ifp && ifp->if_type == IFT_FAITH &&
1033                                     (inp->inp_flags & INP_FAITH) == 0)
1034                                         continue;
1035                                 if (inp->inp_laddr.s_addr == laddr.s_addr)
1036                                         return (inp);
1037                                 else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1038 #ifdef INET6
1039                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
1040                                                              AF_INET6))
1041                                                 local_wild_mapped = inp;
1042                                         else
1043 #endif
1044                                                 local_wild = inp;
1045                                 }
1046                         }
1047                 }
1048 #ifdef INET6
1049                 if (local_wild == NULL)
1050                         return (local_wild_mapped);
1051 #endif
1052                 return (local_wild);
1053         }
1054         return (NULL);
1055 }
1056
1057 /*
1058  * Insert PCB onto various hash lists.
1059  */
1060 int
1061 in_pcbinshash(struct inpcb *inp)
1062 {
1063         struct inpcbhead *pcbhash;
1064         struct inpcbporthead *pcbporthash;
1065         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1066         struct inpcbport *phd;
1067         u_int32_t hashkey_faddr;
1068
1069         INP_INFO_WLOCK_ASSERT(pcbinfo);
1070         INP_LOCK_ASSERT(inp);
1071
1072 #ifdef INET6
1073         if (inp->inp_vflag & INP_IPV6)
1074                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1075         else
1076 #endif /* INET6 */
1077         hashkey_faddr = inp->inp_faddr.s_addr;
1078
1079         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1080                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1081
1082         pcbporthash = &pcbinfo->ipi_porthashbase[
1083             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
1084
1085         /*
1086          * Go through port list and look for a head for this lport.
1087          */
1088         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1089                 if (phd->phd_port == inp->inp_lport)
1090                         break;
1091         }
1092         /*
1093          * If none exists, malloc one and tack it on.
1094          */
1095         if (phd == NULL) {
1096                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1097                 if (phd == NULL) {
1098                         return (ENOBUFS); /* XXX */
1099                 }
1100                 phd->phd_port = inp->inp_lport;
1101                 LIST_INIT(&phd->phd_pcblist);
1102                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1103         }
1104         inp->inp_phd = phd;
1105         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1106         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1107         return (0);
1108 }
1109
1110 /*
1111  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1112  * changed. NOTE: This does not handle the case of the lport changing (the
1113  * hashed port list would have to be updated as well), so the lport must
1114  * not change after in_pcbinshash() has been called.
1115  */
1116 void
1117 in_pcbrehash(struct inpcb *inp)
1118 {
1119         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1120         struct inpcbhead *head;
1121         u_int32_t hashkey_faddr;
1122
1123         INP_INFO_WLOCK_ASSERT(pcbinfo);
1124         INP_LOCK_ASSERT(inp);
1125
1126 #ifdef INET6
1127         if (inp->inp_vflag & INP_IPV6)
1128                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1129         else
1130 #endif /* INET6 */
1131         hashkey_faddr = inp->inp_faddr.s_addr;
1132
1133         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1134                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1135
1136         LIST_REMOVE(inp, inp_hash);
1137         LIST_INSERT_HEAD(head, inp, inp_hash);
1138 }
1139
1140 /*
1141  * Remove PCB from various lists.
1142  */
1143 void
1144 in_pcbremlists(struct inpcb *inp)
1145 {
1146         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1147
1148         INP_INFO_WLOCK_ASSERT(pcbinfo);
1149         INP_LOCK_ASSERT(inp);
1150
1151         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1152         if (inp->inp_lport) {
1153                 struct inpcbport *phd = inp->inp_phd;
1154
1155                 LIST_REMOVE(inp, inp_hash);
1156                 LIST_REMOVE(inp, inp_portlist);
1157                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1158                         LIST_REMOVE(phd, phd_hash);
1159                         free(phd, M_PCB);
1160                 }
1161         }
1162         LIST_REMOVE(inp, inp_list);
1163         pcbinfo->ipi_count--;
1164 }
1165
1166 /*
1167  * A set label operation has occurred at the socket layer, propagate the
1168  * label change into the in_pcb for the socket.
1169  */
1170 void
1171 in_pcbsosetlabel(struct socket *so)
1172 {
1173 #ifdef MAC
1174         struct inpcb *inp;
1175
1176         inp = sotoinpcb(so);
1177         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
1178
1179         INP_LOCK(inp);
1180         SOCK_LOCK(so);
1181         mac_inpcb_sosetlabel(so, inp);
1182         SOCK_UNLOCK(so);
1183         INP_UNLOCK(inp);
1184 #endif
1185 }
1186
1187 /*
1188  * ipport_tick runs once per second, determining if random port allocation
1189  * should be continued.  If more than ipport_randomcps ports have been
1190  * allocated in the last second, then we return to sequential port
1191  * allocation. We return to random allocation only once we drop below
1192  * ipport_randomcps for at least ipport_randomtime seconds.
1193  */
1194 void
1195 ipport_tick(void *xtp)
1196 {
1197
1198         if (ipport_tcpallocs <= ipport_tcplastcount + ipport_randomcps) {
1199                 if (ipport_stoprandom > 0)
1200                         ipport_stoprandom--;
1201         } else
1202                 ipport_stoprandom = ipport_randomtime;
1203         ipport_tcplastcount = ipport_tcpallocs;
1204         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
1205 }
1206
1207 void
1208 inp_wlock(struct inpcb *inp)
1209 {
1210
1211         INP_LOCK(inp);
1212 }
1213
1214 void
1215 inp_wunlock(struct inpcb *inp)
1216 {
1217
1218         INP_UNLOCK(inp);
1219 }
1220
1221 void
1222 inp_rlock(struct inpcb *inp)
1223 {
1224
1225         INP_LOCK(inp);
1226 }
1227
1228 void
1229 inp_runlock(struct inpcb *inp)
1230 {
1231
1232         INP_UNLOCK(inp);
1233 }
1234
1235 #ifdef INVARIANTS
1236 void
1237 inp_lock_assert(struct inpcb *inp)
1238 {
1239
1240         INP_LOCK_ASSERT(inp);
1241 }
1242
1243 void
1244 inp_unlock_assert(struct inpcb *inp)
1245 {
1246
1247         INP_UNLOCK_ASSERT(inp);
1248 }
1249 #endif
1250
1251 #ifdef DDB
1252 static void
1253 db_print_indent(int indent)
1254 {
1255         int i;
1256
1257         for (i = 0; i < indent; i++)
1258                 db_printf(" ");
1259 }
1260
1261 static void
1262 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
1263 {
1264         char faddr_str[48], laddr_str[48];
1265
1266         db_print_indent(indent);
1267         db_printf("%s at %p\n", name, inc);
1268
1269         indent += 2;
1270
1271 #ifdef INET6
1272         if (inc->inc_flags == 1) {
1273                 /* IPv6. */
1274                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
1275                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
1276         } else {
1277 #endif
1278                 /* IPv4. */
1279                 inet_ntoa_r(inc->inc_laddr, laddr_str);
1280                 inet_ntoa_r(inc->inc_faddr, faddr_str);
1281 #ifdef INET6
1282         }
1283 #endif
1284         db_print_indent(indent);
1285         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
1286             ntohs(inc->inc_lport));
1287         db_print_indent(indent);
1288         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
1289             ntohs(inc->inc_fport));
1290 }
1291
1292 static void
1293 db_print_inpflags(int inp_flags)
1294 {
1295         int comma;
1296
1297         comma = 0;
1298         if (inp_flags & INP_RECVOPTS) {
1299                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
1300                 comma = 1;
1301         }
1302         if (inp_flags & INP_RECVRETOPTS) {
1303                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
1304                 comma = 1;
1305         }
1306         if (inp_flags & INP_RECVDSTADDR) {
1307                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
1308                 comma = 1;
1309         }
1310         if (inp_flags & INP_HDRINCL) {
1311                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
1312                 comma = 1;
1313         }
1314         if (inp_flags & INP_HIGHPORT) {
1315                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
1316                 comma = 1;
1317         }
1318         if (inp_flags & INP_LOWPORT) {
1319                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
1320                 comma = 1;
1321         }
1322         if (inp_flags & INP_ANONPORT) {
1323                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
1324                 comma = 1;
1325         }
1326         if (inp_flags & INP_RECVIF) {
1327                 db_printf("%sINP_RECVIF", comma ? ", " : "");
1328                 comma = 1;
1329         }
1330         if (inp_flags & INP_MTUDISC) {
1331                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
1332                 comma = 1;
1333         }
1334         if (inp_flags & INP_FAITH) {
1335                 db_printf("%sINP_FAITH", comma ? ", " : "");
1336                 comma = 1;
1337         }
1338         if (inp_flags & INP_RECVTTL) {
1339                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
1340                 comma = 1;
1341         }
1342         if (inp_flags & INP_DONTFRAG) {
1343                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
1344                 comma = 1;
1345         }
1346         if (inp_flags & IN6P_IPV6_V6ONLY) {
1347                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
1348                 comma = 1;
1349         }
1350         if (inp_flags & IN6P_PKTINFO) {
1351                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
1352                 comma = 1;
1353         }
1354         if (inp_flags & IN6P_HOPLIMIT) {
1355                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
1356                 comma = 1;
1357         }
1358         if (inp_flags & IN6P_HOPOPTS) {
1359                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
1360                 comma = 1;
1361         }
1362         if (inp_flags & IN6P_DSTOPTS) {
1363                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
1364                 comma = 1;
1365         }
1366         if (inp_flags & IN6P_RTHDR) {
1367                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
1368                 comma = 1;
1369         }
1370         if (inp_flags & IN6P_RTHDRDSTOPTS) {
1371                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
1372                 comma = 1;
1373         }
1374         if (inp_flags & IN6P_TCLASS) {
1375                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
1376                 comma = 1;
1377         }
1378         if (inp_flags & IN6P_AUTOFLOWLABEL) {
1379                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
1380                 comma = 1;
1381         }
1382         if (inp_flags & IN6P_RFC2292) {
1383                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
1384                 comma = 1;
1385         }
1386         if (inp_flags & IN6P_MTU) {
1387                 db_printf("IN6P_MTU%s", comma ? ", " : "");
1388                 comma = 1;
1389         }
1390 }
1391
1392 static void
1393 db_print_inpvflag(u_char inp_vflag)
1394 {
1395         int comma;
1396
1397         comma = 0;
1398         if (inp_vflag & INP_IPV4) {
1399                 db_printf("%sINP_IPV4", comma ? ", " : "");
1400                 comma  = 1;
1401         }
1402         if (inp_vflag & INP_IPV6) {
1403                 db_printf("%sINP_IPV6", comma ? ", " : "");
1404                 comma  = 1;
1405         }
1406         if (inp_vflag & INP_IPV6PROTO) {
1407                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
1408                 comma  = 1;
1409         }
1410         if (inp_vflag & INP_TIMEWAIT) {
1411                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
1412                 comma  = 1;
1413         }
1414         if (inp_vflag & INP_ONESBCAST) {
1415                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
1416                 comma  = 1;
1417         }
1418         if (inp_vflag & INP_DROPPED) {
1419                 db_printf("%sINP_DROPPED", comma ? ", " : "");
1420                 comma  = 1;
1421         }
1422         if (inp_vflag & INP_SOCKREF) {
1423                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
1424                 comma  = 1;
1425         }
1426 }
1427
1428 void
1429 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
1430 {
1431
1432         db_print_indent(indent);
1433         db_printf("%s at %p\n", name, inp);
1434
1435         indent += 2;
1436
1437         db_print_indent(indent);
1438         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
1439
1440         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
1441
1442         db_print_indent(indent);
1443         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
1444             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
1445
1446         db_print_indent(indent);
1447         db_printf("inp_label: %p   inp_flags: 0x%x (",
1448            inp->inp_label, inp->inp_flags);
1449         db_print_inpflags(inp->inp_flags);
1450         db_printf(")\n");
1451
1452         db_print_indent(indent);
1453         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
1454             inp->inp_vflag);
1455         db_print_inpvflag(inp->inp_vflag);
1456         db_printf(")\n");
1457
1458         db_print_indent(indent);
1459         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
1460             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
1461
1462         db_print_indent(indent);
1463 #ifdef INET6
1464         if (inp->inp_vflag & INP_IPV6) {
1465                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
1466                     "in6p_moptions: %p\n", inp->in6p_options,
1467                     inp->in6p_outputopts, inp->in6p_moptions);
1468                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
1469                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
1470                     inp->in6p_hops);
1471         } else
1472 #endif
1473         {
1474                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
1475                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
1476                     inp->inp_options, inp->inp_moptions);
1477         }
1478
1479         db_print_indent(indent);
1480         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
1481             (uintmax_t)inp->inp_gencnt);
1482 }
1483
1484 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
1485 {
1486         struct inpcb *inp;
1487
1488         if (!have_addr) {
1489                 db_printf("usage: show inpcb <addr>\n");
1490                 return;
1491         }
1492         inp = (struct inpcb *)addr;
1493
1494         db_print_inpcb(inp, "inpcb", 0);
1495 }
1496 #endif