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) 2007-2009 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
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/malloc.h>
  44 #include <sys/mbuf.h>
  45 #include <sys/domain.h>
  46 #include <sys/protosw.h>
  47 #include <sys/socket.h>
  48 #include <sys/socketvar.h>
  49 #include <sys/priv.h>
  50 #include <sys/proc.h>
  51 #include <sys/jail.h>
  52 #include <sys/kernel.h>
  53 #include <sys/sysctl.h>
  54
  55 #ifdef DDB
  56 #include <ddb/ddb.h>
  57 #endif
  58
  59 #include <vm/uma.h>
  60
  61 #include <net/if.h>
  62 #include <net/if_types.h>
  63 #include <net/route.h>
  64 #include <net/vnet.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 VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1;    /* 1023 */
  91 VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART;    /* 600 */
  92 VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST;     /* 10000 */
  93 VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST;       /* 65535 */
  94 VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO;      /* 49152 */
  95 VNET_DEFINE(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 VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1;    /* 1023 */
 103 VNET_DEFINE(int, ipport_reservedlow);
 104
 105 /* Variables dealing with random ephemeral port allocation. */
 106 VNET_DEFINE(int, ipport_randomized) = 1;        /* user controlled via sysctl */
 107 VNET_DEFINE(int, ipport_randomcps) = 10;        /* user controlled via sysctl */
 108 VNET_DEFINE(int, ipport_randomtime) = 45;       /* user controlled via sysctl */
 109 VNET_DEFINE(int, ipport_stoprandom);            /* toggled by ipport_tick */
 110 VNET_DEFINE(int, ipport_tcpallocs);
 111 static VNET_DEFINE(int, ipport_tcplastcount);
 112
 113 #define V_ipport_tcplastcount           VNET(ipport_tcplastcount)
 114
 115 #define RANGECHK(var, min, max) \
 116         if ((var) < (min)) { (var) = (min); } \
 117         else if ((var) > (max)) { (var) = (max); }
 118
 119 static void     in_pcbremlists(struct inpcb *inp);
 120
 121 static int
 122 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 123 {
 124         int error;
 125
 126 #ifdef VIMAGE
 127         error = vnet_sysctl_handle_int(oidp, arg1, arg2, req);
 128 #else
 129         error = sysctl_handle_int(oidp, arg1, arg2, req);
 130 #endif
 131         if (error == 0) {
 132                 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 133                 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 134                 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
 135                 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
 136                 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
 137                 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
 138         }
 139         return (error);
 140 }
 141
 142 #undef RANGECHK
 143
 144 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
 145
 146 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst,
 147         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowfirstauto), 0,
 148         &sysctl_net_ipport_check, "I", "");
 149 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast,
 150         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowlastauto), 0,
 151         &sysctl_net_ipport_check, "I", "");
 152 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, first,
 153         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_firstauto), 0,
 154         &sysctl_net_ipport_check, "I", "");
 155 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, last,
 156         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lastauto), 0,
 157         &sysctl_net_ipport_check, "I", "");
 158 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst,
 159         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hifirstauto), 0,
 160         &sysctl_net_ipport_check, "I", "");
 161 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hilast,
 162         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hilastauto), 0,
 163         &sysctl_net_ipport_check, "I", "");
 164 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
 165         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedhigh), 0, "");
 166 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
 167         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, "");
 168 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
 169         &VNET_NAME(ipport_randomized), 0, "Enable random port allocation");
 170 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
 171         &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port "
 172         "allocations before switching to a sequental one");
 173 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
 174         &VNET_NAME(ipport_randomtime), 0,
 175         "Minimum time to keep sequental port "
 176         "allocation before switching to a random one");
 177
 178 /*
 179  * in_pcb.c: manage the Protocol Control Blocks.
 180  *
 181  * NOTE: It is assumed that most of these functions will be called with
 182  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
 183  * functions often modify hash chains or addresses in pcbs.
 184  */
 185
 186 /*
 187  * Allocate a PCB and associate it with the socket.
 188  * On success return with the PCB locked.
 189  */
 190 int
 191 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 192 {
 193         struct inpcb *inp;
 194         int error;
 195
 196         INP_INFO_WLOCK_ASSERT(pcbinfo);
 197         error = 0;
 198         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
 199         if (inp == NULL)
 200                 return (ENOBUFS);
 201         bzero(inp, inp_zero_size);
 202         inp->inp_pcbinfo = pcbinfo;
 203         inp->inp_socket = so;
 204         inp->inp_cred = crhold(so->so_cred);
 205         inp->inp_inc.inc_fibnum = so->so_fibnum;
 206 #ifdef MAC
 207         error = mac_inpcb_init(inp, M_NOWAIT);
 208         if (error != 0)
 209                 goto out;
 210         mac_inpcb_create(so, inp);
 211 #endif
 212 #ifdef IPSEC
 213         error = ipsec_init_policy(so, &inp->inp_sp);
 214         if (error != 0) {
 215 #ifdef MAC
 216                 mac_inpcb_destroy(inp);
 217 #endif
 218                 goto out;
 219         }
 220 #endif /*IPSEC*/
 221 #ifdef INET6
 222         if (INP_SOCKAF(so) == AF_INET6) {
 223                 inp->inp_vflag |= INP_IPV6PROTO;
 224                 if (V_ip6_v6only)
 225                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 226         }
 227 #endif
 228         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
 229         pcbinfo->ipi_count++;
 230         so->so_pcb = (caddr_t)inp;
 231 #ifdef INET6
 232         if (V_ip6_auto_flowlabel)
 233                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 234 #endif
 235         INP_WLOCK(inp);
 236         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 237         inp->inp_refcount = 1;  /* Reference from the inpcbinfo */
 238 #if defined(IPSEC) || defined(MAC)
 239 out:
 240         if (error != 0) {
 241                 crfree(inp->inp_cred);
 242                 uma_zfree(pcbinfo->ipi_zone, inp);
 243         }
 244 #endif
 245         return (error);
 246 }
 247
 248 int
 249 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 250 {
 251         int anonport, error;
 252
 253         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 254         INP_WLOCK_ASSERT(inp);
 255
 256         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 257                 return (EINVAL);
 258         anonport = inp->inp_lport == 0 && (nam == NULL ||
 259             ((struct sockaddr_in *)nam)->sin_port == 0);
 260         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 261             &inp->inp_lport, cred);
 262         if (error)
 263                 return (error);
 264         if (in_pcbinshash(inp) != 0) {
 265                 inp->inp_laddr.s_addr = INADDR_ANY;
 266                 inp->inp_lport = 0;
 267                 return (EAGAIN);
 268         }
 269         if (anonport)
 270                 inp->inp_flags |= INP_ANONPORT;
 271         return (0);
 272 }
 273
 274 /*
 275  * Set up a bind operation on a PCB, performing port allocation
 276  * as required, but do not actually modify the PCB. Callers can
 277  * either complete the bind by setting inp_laddr/inp_lport and
 278  * calling in_pcbinshash(), or they can just use the resulting
 279  * port and address to authorise the sending of a once-off packet.
 280  *
 281  * On error, the values of *laddrp and *lportp are not changed.
 282  */
 283 int
 284 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 285     u_short *lportp, struct ucred *cred)
 286 {
 287         struct socket *so = inp->inp_socket;
 288         unsigned short *lastport;
 289         struct sockaddr_in *sin;
 290         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 291         struct in_addr laddr;
 292         u_short lport = 0;
 293         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 294         int error;
 295         int dorandom;
 296
 297         /*
 298          * Because no actual state changes occur here, a global write lock on
 299          * the pcbinfo isn't required.
 300          */
 301         INP_INFO_LOCK_ASSERT(pcbinfo);
 302         INP_LOCK_ASSERT(inp);
 303
 304         if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
 305                 return (EADDRNOTAVAIL);
 306         laddr.s_addr = *laddrp;
 307         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 308                 return (EINVAL);
 309         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 310                 wild = INPLOOKUP_WILDCARD;
 311         if (nam == NULL) {
 312                 if ((error = prison_local_ip4(cred, &laddr)) != 0)
 313                         return (error);
 314         } else {
 315                 sin = (struct sockaddr_in *)nam;
 316                 if (nam->sa_len != sizeof (*sin))
 317                         return (EINVAL);
 318 #ifdef notdef
 319                 /*
 320                  * We should check the family, but old programs
 321                  * incorrectly fail to initialize it.
 322                  */
 323                 if (sin->sin_family != AF_INET)
 324                         return (EAFNOSUPPORT);
 325 #endif
 326                 error = prison_local_ip4(cred, &sin->sin_addr);
 327                 if (error)
 328                         return (error);
 329                 if (sin->sin_port != *lportp) {
 330                         /* Don't allow the port to change. */
 331                         if (*lportp != 0)
 332                                 return (EINVAL);
 333                         lport = sin->sin_port;
 334                 }
 335                 /* NB: lport is left as 0 if the port isn't being changed. */
 336                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 337                         /*
 338                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 339                          * allow complete duplication of binding if
 340                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 341                          * and a multicast address is bound on both
 342                          * new and duplicated sockets.
 343                          */
 344                         if (so->so_options & SO_REUSEADDR)
 345                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 346                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 347                         sin->sin_port = 0;              /* yech... */
 348                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 349                         /*
 350                          * Is the address a local IP address?
 351                          * If INP_BINDANY is set, then the socket may be bound
 352                          * to any endpoint address, local or not.
 353                          */
 354                         if ((inp->inp_flags & INP_BINDANY) == 0 &&
 355                             ifa_ifwithaddr_check((struct sockaddr *)sin) == 0)
 356                                 return (EADDRNOTAVAIL);
 357                 }
 358                 laddr = sin->sin_addr;
 359                 if (lport) {
 360                         struct inpcb *t;
 361                         struct tcptw *tw;
 362
 363                         /* GROSS */
 364                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 365                             ntohs(lport) >= V_ipport_reservedlow &&
 366                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 367                             0))
 368                                 return (EACCES);
 369                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 370                             priv_check_cred(inp->inp_cred,
 371                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 372                                 t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 373                                     lport, INPLOOKUP_WILDCARD, cred);
 374         /*
 375          * XXX
 376          * This entire block sorely needs a rewrite.
 377          */
 378                                 if (t &&
 379                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 380                                     (so->so_type != SOCK_STREAM ||
 381                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
 382                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
 383                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 384                                      (t->inp_socket->so_options &
 385                                          SO_REUSEPORT) == 0) &&
 386                                     (inp->inp_cred->cr_uid !=
 387                                      t->inp_cred->cr_uid))
 388                                         return (EADDRINUSE);
 389                         }
 390                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 391                             lport, wild, cred);
 392                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 393                                 /*
 394                                  * XXXRW: If an incpb has had its timewait
 395                                  * state recycled, we treat the address as
 396                                  * being in use (for now).  This is better
 397                                  * than a panic, but not desirable.
 398                                  */
 399                                 tw = intotw(inp);
 400                                 if (tw == NULL ||
 401                                     (reuseport & tw->tw_so_options) == 0)
 402                                         return (EADDRINUSE);
 403                         } else if (t &&
 404                             (reuseport & t->inp_socket->so_options) == 0) {
 405 #ifdef INET6
 406                                 if (ntohl(sin->sin_addr.s_addr) !=
 407                                     INADDR_ANY ||
 408                                     ntohl(t->inp_laddr.s_addr) !=
 409                                     INADDR_ANY ||
 410                                     INP_SOCKAF(so) ==
 411                                     INP_SOCKAF(t->inp_socket))
 412 #endif
 413                                 return (EADDRINUSE);
 414                         }
 415                 }
 416         }
 417         if (*lportp != 0)
 418                 lport = *lportp;
 419         if (lport == 0) {
 420                 u_short first, last, aux;
 421                 int count;
 422
 423                 if (inp->inp_flags & INP_HIGHPORT) {
 424                         first = V_ipport_hifirstauto;   /* sysctl */
 425                         last  = V_ipport_hilastauto;
 426                         lastport = &pcbinfo->ipi_lasthi;
 427                 } else if (inp->inp_flags & INP_LOWPORT) {
 428                         error = priv_check_cred(cred,
 429                             PRIV_NETINET_RESERVEDPORT, 0);
 430                         if (error)
 431                                 return error;
 432                         first = V_ipport_lowfirstauto;  /* 1023 */
 433                         last  = V_ipport_lowlastauto;   /* 600 */
 434                         lastport = &pcbinfo->ipi_lastlow;
 435                 } else {
 436                         first = V_ipport_firstauto;     /* sysctl */
 437                         last  = V_ipport_lastauto;
 438                         lastport = &pcbinfo->ipi_lastport;
 439                 }
 440                 /*
 441                  * For UDP, use random port allocation as long as the user
 442                  * allows it.  For TCP (and as of yet unknown) connections,
 443                  * use random port allocation only if the user allows it AND
 444                  * ipport_tick() allows it.
 445                  */
 446                 if (V_ipport_randomized &&
 447                         (!V_ipport_stoprandom || pcbinfo == &V_udbinfo))
 448                         dorandom = 1;
 449                 else
 450                         dorandom = 0;
 451                 /*
 452                  * It makes no sense to do random port allocation if
 453                  * we have the only port available.
 454                  */
 455                 if (first == last)
 456                         dorandom = 0;
 457                 /* Make sure to not include UDP packets in the count. */
 458                 if (pcbinfo != &V_udbinfo)
 459                         V_ipport_tcpallocs++;
 460                 /*
 461                  * Instead of having two loops further down counting up or down
 462                  * make sure that first is always <= last and go with only one
 463                  * code path implementing all logic.
 464                  */
 465                 if (first > last) {
 466                         aux = first;
 467                         first = last;
 468                         last = aux;
 469                 }
 470
 471                 if (dorandom)
 472                         *lastport = first +
 473                                     (arc4random() % (last - first));
 474
 475                 count = last - first;
 476
 477                 do {
 478                         if (count-- < 0)        /* completely used? */
 479                                 return (EADDRNOTAVAIL);
 480                         ++*lastport;
 481                         if (*lastport < first || *lastport > last)
 482                                 *lastport = first;
 483                         lport = htons(*lastport);
 484                 } while (in_pcblookup_local(pcbinfo, laddr,
 485                     lport, wild, cred));
 486         }
 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_WLOCK_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  * Do proper source address selection on an unbound socket in case
 541  * of connect. Take jails into account as well.
 542  */
 543 static int
 544 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
 545     struct ucred *cred)
 546 {
 547         struct ifaddr *ifa;
 548         struct sockaddr *sa;
 549         struct sockaddr_in *sin;
 550         struct route sro;
 551         int error;
 552
 553         KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
 554
 555         error = 0;
 556         bzero(&sro, sizeof(sro));
 557
 558         sin = (struct sockaddr_in *)&sro.ro_dst;
 559         sin->sin_family = AF_INET;
 560         sin->sin_len = sizeof(struct sockaddr_in);
 561         sin->sin_addr.s_addr = faddr->s_addr;
 562
 563         /*
 564          * If route is known our src addr is taken from the i/f,
 565          * else punt.
 566          *
 567          * Find out route to destination.
 568          */
 569         if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 570                 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
 571
 572         /*
 573          * If we found a route, use the address corresponding to
 574          * the outgoing interface.
 575          *
 576          * Otherwise assume faddr is reachable on a directly connected
 577          * network and try to find a corresponding interface to take
 578          * the source address from.
 579          */
 580         if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
 581                 struct in_ifaddr *ia;
 582                 struct ifnet *ifp;
 583
 584                 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin));
 585                 if (ia == NULL)
 586                         ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin));
 587                 if (ia == NULL) {
 588                         error = ENETUNREACH;
 589                         goto done;
 590                 }
 591
 592                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 593                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 594                         ifa_free(&ia->ia_ifa);
 595                         goto done;
 596                 }
 597
 598                 ifp = ia->ia_ifp;
 599                 ifa_free(&ia->ia_ifa);
 600                 ia = NULL;
 601                 IF_ADDR_LOCK(ifp);
 602                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 603
 604                         sa = ifa->ifa_addr;
 605                         if (sa->sa_family != AF_INET)
 606                                 continue;
 607                         sin = (struct sockaddr_in *)sa;
 608                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 609                                 ia = (struct in_ifaddr *)ifa;
 610                                 break;
 611                         }
 612                 }
 613                 if (ia != NULL) {
 614                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 615                         IF_ADDR_UNLOCK(ifp);
 616                         goto done;
 617                 }
 618                 IF_ADDR_UNLOCK(ifp);
 619
 620                 /* 3. As a last resort return the 'default' jail address. */
 621                 error = prison_get_ip4(cred, laddr);
 622                 goto done;
 623         }
 624
 625         /*
 626          * If the outgoing interface on the route found is not
 627          * a loopback interface, use the address from that interface.
 628          * In case of jails do those three steps:
 629          * 1. check if the interface address belongs to the jail. If so use it.
 630          * 2. check if we have any address on the outgoing interface
 631          *    belonging to this jail. If so use it.
 632          * 3. as a last resort return the 'default' jail address.
 633          */
 634         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
 635                 struct in_ifaddr *ia;
 636                 struct ifnet *ifp;
 637
 638                 /* If not jailed, use the default returned. */
 639                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 640                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 641                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 642                         goto done;
 643                 }
 644
 645                 /* Jailed. */
 646                 /* 1. Check if the iface address belongs to the jail. */
 647                 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
 648                 if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 649                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 650                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 651                         goto done;
 652                 }
 653
 654                 /*
 655                  * 2. Check if we have any address on the outgoing interface
 656                  *    belonging to this jail.
 657                  */
 658                 ia = NULL;
 659                 ifp = sro.ro_rt->rt_ifp;
 660                 IF_ADDR_LOCK(ifp);
 661                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 662                         sa = ifa->ifa_addr;
 663                         if (sa->sa_family != AF_INET)
 664                                 continue;
 665                         sin = (struct sockaddr_in *)sa;
 666                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 667                                 ia = (struct in_ifaddr *)ifa;
 668                                 break;
 669                         }
 670                 }
 671                 if (ia != NULL) {
 672                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 673                         IF_ADDR_UNLOCK(ifp);
 674                         goto done;
 675                 }
 676                 IF_ADDR_UNLOCK(ifp);
 677
 678                 /* 3. As a last resort return the 'default' jail address. */
 679                 error = prison_get_ip4(cred, laddr);
 680                 goto done;
 681         }
 682
 683         /*
 684          * The outgoing interface is marked with 'loopback net', so a route
 685          * to ourselves is here.
 686          * Try to find the interface of the destination address and then
 687          * take the address from there. That interface is not necessarily
 688          * a loopback interface.
 689          * In case of jails, check that it is an address of the jail
 690          * and if we cannot find, fall back to the 'default' jail address.
 691          */
 692         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
 693                 struct sockaddr_in sain;
 694                 struct in_ifaddr *ia;
 695
 696                 bzero(&sain, sizeof(struct sockaddr_in));
 697                 sain.sin_family = AF_INET;
 698                 sain.sin_len = sizeof(struct sockaddr_in);
 699                 sain.sin_addr.s_addr = faddr->s_addr;
 700
 701                 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain)));
 702                 if (ia == NULL)
 703                         ia = ifatoia(ifa_ifwithnet(sintosa(&sain)));
 704
 705                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 706                         if (ia == NULL) {
 707                                 error = ENETUNREACH;
 708                                 goto done;
 709                         }
 710                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 711                         ifa_free(&ia->ia_ifa);
 712                         goto done;
 713                 }
 714
 715                 /* Jailed. */
 716                 if (ia != NULL) {
 717                         struct ifnet *ifp;
 718
 719                         ifp = ia->ia_ifp;
 720                         ifa_free(&ia->ia_ifa);
 721                         ia = NULL;
 722                         IF_ADDR_LOCK(ifp);
 723                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 724
 725                                 sa = ifa->ifa_addr;
 726                                 if (sa->sa_family != AF_INET)
 727                                         continue;
 728                                 sin = (struct sockaddr_in *)sa;
 729                                 if (prison_check_ip4(cred,
 730                                     &sin->sin_addr) == 0) {
 731                                         ia = (struct in_ifaddr *)ifa;
 732                                         break;
 733                                 }
 734                         }
 735                         if (ia != NULL) {
 736                                 laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 737                                 IF_ADDR_UNLOCK(ifp);
 738                                 goto done;
 739                         }
 740                         IF_ADDR_UNLOCK(ifp);
 741                 }
 742
 743                 /* 3. As a last resort return the 'default' jail address. */
 744                 error = prison_get_ip4(cred, laddr);
 745                 goto done;
 746         }
 747
 748 done:
 749         if (sro.ro_rt != NULL)
 750                 RTFREE(sro.ro_rt);
 751         return (error);
 752 }
 753
 754 /*
 755  * Set up for a connect from a socket to the specified address.
 756  * On entry, *laddrp and *lportp should contain the current local
 757  * address and port for the PCB; these are updated to the values
 758  * that should be placed in inp_laddr and inp_lport to complete
 759  * the connect.
 760  *
 761  * On success, *faddrp and *fportp will be set to the remote address
 762  * and port. These are not updated in the error case.
 763  *
 764  * If the operation fails because the connection already exists,
 765  * *oinpp will be set to the PCB of that connection so that the
 766  * caller can decide to override it. In all other cases, *oinpp
 767  * is set to NULL.
 768  */
 769 int
 770 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 771     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 772     struct inpcb **oinpp, struct ucred *cred)
 773 {
 774         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 775         struct in_ifaddr *ia;
 776         struct inpcb *oinp;
 777         struct in_addr laddr, faddr;
 778         u_short lport, fport;
 779         int error;
 780
 781         /*
 782          * Because a global state change doesn't actually occur here, a read
 783          * lock is sufficient.
 784          */
 785         INP_INFO_LOCK_ASSERT(inp->inp_pcbinfo);
 786         INP_LOCK_ASSERT(inp);
 787
 788         if (oinpp != NULL)
 789                 *oinpp = NULL;
 790         if (nam->sa_len != sizeof (*sin))
 791                 return (EINVAL);
 792         if (sin->sin_family != AF_INET)
 793                 return (EAFNOSUPPORT);
 794         if (sin->sin_port == 0)
 795                 return (EADDRNOTAVAIL);
 796         laddr.s_addr = *laddrp;
 797         lport = *lportp;
 798         faddr = sin->sin_addr;
 799         fport = sin->sin_port;
 800
 801         if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
 802                 /*
 803                  * If the destination address is INADDR_ANY,
 804                  * use the primary local address.
 805                  * If the supplied address is INADDR_BROADCAST,
 806                  * and the primary interface supports broadcast,
 807                  * choose the broadcast address for that interface.
 808                  */
 809                 if (faddr.s_addr == INADDR_ANY) {
 810                         IN_IFADDR_RLOCK();
 811                         faddr =
 812                             IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
 813                         IN_IFADDR_RUNLOCK();
 814                         if (cred != NULL &&
 815                             (error = prison_get_ip4(cred, &faddr)) != 0)
 816                                 return (error);
 817                 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
 818                         IN_IFADDR_RLOCK();
 819                         if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
 820                             IFF_BROADCAST)
 821                                 faddr = satosin(&TAILQ_FIRST(
 822                                     &V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
 823                         IN_IFADDR_RUNLOCK();
 824                 }
 825         }
 826         if (laddr.s_addr == INADDR_ANY) {
 827                 error = in_pcbladdr(inp, &faddr, &laddr, cred);
 828                 if (error)
 829                         return (error);
 830
 831                 /*
 832                  * If the destination address is multicast and an outgoing
 833                  * interface has been set as a multicast option, use the
 834                  * address of that interface as our source address.
 835                  */
 836                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
 837                     inp->inp_moptions != NULL) {
 838                         struct ip_moptions *imo;
 839                         struct ifnet *ifp;
 840
 841                         imo = inp->inp_moptions;
 842                         if (imo->imo_multicast_ifp != NULL) {
 843                                 ifp = imo->imo_multicast_ifp;
 844                                 IN_IFADDR_RLOCK();
 845                                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link)
 846                                         if (ia->ia_ifp == ifp)
 847                                                 break;
 848                                 if (ia == NULL) {
 849                                         IN_IFADDR_RUNLOCK();
 850                                         return (EADDRNOTAVAIL);
 851                                 }
 852                                 laddr = ia->ia_addr.sin_addr;
 853                                 IN_IFADDR_RUNLOCK();
 854                         }
 855                 }
 856         }
 857
 858         oinp = in_pcblookup_hash(inp->inp_pcbinfo, faddr, fport, laddr, lport,
 859             0, NULL);
 860         if (oinp != NULL) {
 861                 if (oinpp != NULL)
 862                         *oinpp = oinp;
 863                 return (EADDRINUSE);
 864         }
 865         if (lport == 0) {
 866                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
 867                     cred);
 868                 if (error)
 869                         return (error);
 870         }
 871         *laddrp = laddr.s_addr;
 872         *lportp = lport;
 873         *faddrp = faddr.s_addr;
 874         *fportp = fport;
 875         return (0);
 876 }
 877
 878 void
 879 in_pcbdisconnect(struct inpcb *inp)
 880 {
 881
 882         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 883         INP_WLOCK_ASSERT(inp);
 884
 885         inp->inp_faddr.s_addr = INADDR_ANY;
 886         inp->inp_fport = 0;
 887         in_pcbrehash(inp);
 888 }
 889
 890 /*
 891  * in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
 892  * For most protocols, this will be invoked immediately prior to calling
 893  * in_pcbfree().  However, with TCP the inpcb may significantly outlive the
 894  * socket, in which case in_pcbfree() is deferred.
 895  */
 896 void
 897 in_pcbdetach(struct inpcb *inp)
 898 {
 899
 900         KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
 901
 902         inp->inp_socket->so_pcb = NULL;
 903         inp->inp_socket = NULL;
 904 }
 905
 906 /*
 907  * in_pcbfree_internal() frees an inpcb that has been detached from its
 908  * socket, and whose reference count has reached 0.  It will also remove the
 909  * inpcb from any global lists it might remain on.
 910  */
 911 static void
 912 in_pcbfree_internal(struct inpcb *inp)
 913 {
 914         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 915
 916         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
 917         KASSERT(inp->inp_refcount == 0, ("%s: refcount !0", __func__));
 918
 919         INP_INFO_WLOCK_ASSERT(ipi);
 920         INP_WLOCK_ASSERT(inp);
 921
 922 #ifdef IPSEC
 923         if (inp->inp_sp != NULL)
 924                 ipsec_delete_pcbpolicy(inp);
 925 #endif /* IPSEC */
 926         inp->inp_gencnt = ++ipi->ipi_gencnt;
 927         in_pcbremlists(inp);
 928 #ifdef INET6
 929         if (inp->inp_vflag & INP_IPV6PROTO) {
 930                 ip6_freepcbopts(inp->in6p_outputopts);
 931                 if (inp->in6p_moptions != NULL)
 932                         ip6_freemoptions(inp->in6p_moptions);
 933         }
 934 #endif
 935         if (inp->inp_options)
 936                 (void)m_free(inp->inp_options);
 937         if (inp->inp_moptions != NULL)
 938                 inp_freemoptions(inp->inp_moptions);
 939         inp->inp_vflag = 0;
 940         crfree(inp->inp_cred);
 941
 942 #ifdef MAC
 943         mac_inpcb_destroy(inp);
 944 #endif
 945         INP_WUNLOCK(inp);
 946         uma_zfree(ipi->ipi_zone, inp);
 947 }
 948
 949 /*
 950  * in_pcbref() bumps the reference count on an inpcb in order to maintain
 951  * stability of an inpcb pointer despite the inpcb lock being released.  This
 952  * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
 953  * but where the inpcb lock is already held.
 954  *
 955  * While the inpcb will not be freed, releasing the inpcb lock means that the
 956  * connection's state may change, so the caller should be careful to
 957  * revalidate any cached state on reacquiring the lock.  Drop the reference
 958  * using in_pcbrele().
 959  */
 960 void
 961 in_pcbref(struct inpcb *inp)
 962 {
 963
 964         INP_WLOCK_ASSERT(inp);
 965
 966         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
 967
 968         inp->inp_refcount++;
 969 }
 970
 971 /*
 972  * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
 973  * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
 974  * return a flag indicating whether or not the inpcb remains valid.  If it is
 975  * valid, we return with the inpcb lock held.
 976  */
 977 int
 978 in_pcbrele(struct inpcb *inp)
 979 {
 980 #ifdef INVARIANTS
 981         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 982 #endif
 983
 984         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
 985
 986         INP_INFO_WLOCK_ASSERT(ipi);
 987         INP_WLOCK_ASSERT(inp);
 988
 989         inp->inp_refcount--;
 990         if (inp->inp_refcount > 0)
 991                 return (0);
 992         in_pcbfree_internal(inp);
 993         return (1);
 994 }
 995
 996 /*
 997  * Unconditionally schedule an inpcb to be freed by decrementing its
 998  * reference count, which should occur only after the inpcb has been detached
 999  * from its socket.  If another thread holds a temporary reference (acquired
1000  * using in_pcbref()) then the free is deferred until that reference is
1001  * released using in_pcbrele(), but the inpcb is still unlocked.
1002  */
1003 void
1004 in_pcbfree(struct inpcb *inp)
1005 {
1006 #ifdef INVARIANTS
1007         struct inpcbinfo *ipi = inp->inp_pcbinfo;
1008 #endif
1009
1010         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL",
1011             __func__));
1012
1013         INP_INFO_WLOCK_ASSERT(ipi);
1014         INP_WLOCK_ASSERT(inp);
1015
1016         if (!in_pcbrele(inp))
1017                 INP_WUNLOCK(inp);
1018 }
1019
1020 /*
1021  * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
1022  * port reservation, and preventing it from being returned by inpcb lookups.
1023  *
1024  * It is used by TCP to mark an inpcb as unused and avoid future packet
1025  * delivery or event notification when a socket remains open but TCP has
1026  * closed.  This might occur as a result of a shutdown()-initiated TCP close
1027  * or a RST on the wire, and allows the port binding to be reused while still
1028  * maintaining the invariant that so_pcb always points to a valid inpcb until
1029  * in_pcbdetach().
1030  *
1031  * XXXRW: An inp_lport of 0 is used to indicate that the inpcb is not on hash
1032  * lists, but can lead to confusing netstat output, as open sockets with
1033  * closed TCP connections will no longer appear to have their bound port
1034  * number.  An explicit flag would be better, as it would allow us to leave
1035  * the port number intact after the connection is dropped.
1036  *
1037  * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
1038  * in_pcbnotifyall() and in_pcbpurgeif0()?
1039  */
1040 void
1041 in_pcbdrop(struct inpcb *inp)
1042 {
1043
1044         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
1045         INP_WLOCK_ASSERT(inp);
1046
1047         inp->inp_flags |= INP_DROPPED;
1048         if (inp->inp_flags & INP_INHASHLIST) {
1049                 struct inpcbport *phd = inp->inp_phd;
1050
1051                 LIST_REMOVE(inp, inp_hash);
1052                 LIST_REMOVE(inp, inp_portlist);
1053                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1054                         LIST_REMOVE(phd, phd_hash);
1055                         free(phd, M_PCB);
1056                 }
1057                 inp->inp_flags &= ~INP_INHASHLIST;
1058         }
1059 }
1060
1061 /*
1062  * Common routines to return the socket addresses associated with inpcbs.
1063  */
1064 struct sockaddr *
1065 in_sockaddr(in_port_t port, struct in_addr *addr_p)
1066 {
1067         struct sockaddr_in *sin;
1068
1069         sin = malloc(sizeof *sin, M_SONAME,
1070                 M_WAITOK | M_ZERO);
1071         sin->sin_family = AF_INET;
1072         sin->sin_len = sizeof(*sin);
1073         sin->sin_addr = *addr_p;
1074         sin->sin_port = port;
1075
1076         return (struct sockaddr *)sin;
1077 }
1078
1079 int
1080 in_getsockaddr(struct socket *so, struct sockaddr **nam)
1081 {
1082         struct inpcb *inp;
1083         struct in_addr addr;
1084         in_port_t port;
1085
1086         inp = sotoinpcb(so);
1087         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
1088
1089         INP_RLOCK(inp);
1090         port = inp->inp_lport;
1091         addr = inp->inp_laddr;
1092         INP_RUNLOCK(inp);
1093
1094         *nam = in_sockaddr(port, &addr);
1095         return 0;
1096 }
1097
1098 int
1099 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
1100 {
1101         struct inpcb *inp;
1102         struct in_addr addr;
1103         in_port_t port;
1104
1105         inp = sotoinpcb(so);
1106         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
1107
1108         INP_RLOCK(inp);
1109         port = inp->inp_fport;
1110         addr = inp->inp_faddr;
1111         INP_RUNLOCK(inp);
1112
1113         *nam = in_sockaddr(port, &addr);
1114         return 0;
1115 }
1116
1117 void
1118 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
1119     struct inpcb *(*notify)(struct inpcb *, int))
1120 {
1121         struct inpcb *inp, *inp_temp;
1122
1123         INP_INFO_WLOCK(pcbinfo);
1124         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
1125                 INP_WLOCK(inp);
1126 #ifdef INET6
1127                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1128                         INP_WUNLOCK(inp);
1129                         continue;
1130                 }
1131 #endif
1132                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1133                     inp->inp_socket == NULL) {
1134                         INP_WUNLOCK(inp);
1135                         continue;
1136                 }
1137                 if ((*notify)(inp, errno))
1138                         INP_WUNLOCK(inp);
1139         }
1140         INP_INFO_WUNLOCK(pcbinfo);
1141 }
1142
1143 void
1144 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
1145 {
1146         struct inpcb *inp;
1147         struct ip_moptions *imo;
1148         int i, gap;
1149
1150         INP_INFO_RLOCK(pcbinfo);
1151         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
1152                 INP_WLOCK(inp);
1153                 imo = inp->inp_moptions;
1154                 if ((inp->inp_vflag & INP_IPV4) &&
1155                     imo != NULL) {
1156                         /*
1157                          * Unselect the outgoing interface if it is being
1158                          * detached.
1159                          */
1160                         if (imo->imo_multicast_ifp == ifp)
1161                                 imo->imo_multicast_ifp = NULL;
1162
1163                         /*
1164                          * Drop multicast group membership if we joined
1165                          * through the interface being detached.
1166                          */
1167                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1168                             i++) {
1169                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1170                                         in_delmulti(imo->imo_membership[i]);
1171                                         gap++;
1172                                 } else if (gap != 0)
1173                                         imo->imo_membership[i - gap] =
1174                                             imo->imo_membership[i];
1175                         }
1176                         imo->imo_num_memberships -= gap;
1177                 }
1178                 INP_WUNLOCK(inp);
1179         }
1180         INP_INFO_RUNLOCK(pcbinfo);
1181 }
1182
1183 /*
1184  * Lookup a PCB based on the local address and port.
1185  */
1186 #define INP_LOOKUP_MAPPED_PCB_COST      3
1187 struct inpcb *
1188 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
1189     u_short lport, int wild_okay, struct ucred *cred)
1190 {
1191         struct inpcb *inp;
1192 #ifdef INET6
1193         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
1194 #else
1195         int matchwild = 3;
1196 #endif
1197         int wildcard;
1198
1199         INP_INFO_LOCK_ASSERT(pcbinfo);
1200
1201         if (!wild_okay) {
1202                 struct inpcbhead *head;
1203                 /*
1204                  * Look for an unconnected (wildcard foreign addr) PCB that
1205                  * matches the local address and port we're looking for.
1206                  */
1207                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1208                     0, pcbinfo->ipi_hashmask)];
1209                 LIST_FOREACH(inp, head, inp_hash) {
1210 #ifdef INET6
1211                         /* XXX inp locking */
1212                         if ((inp->inp_vflag & INP_IPV4) == 0)
1213                                 continue;
1214 #endif
1215                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1216                             inp->inp_laddr.s_addr == laddr.s_addr &&
1217                             inp->inp_lport == lport) {
1218                                 /*
1219                                  * Found?
1220                                  */
1221                                 if (cred == NULL ||
1222                                     prison_equal_ip4(cred->cr_prison,
1223                                         inp->inp_cred->cr_prison))
1224                                         return (inp);
1225                         }
1226                 }
1227                 /*
1228                  * Not found.
1229                  */
1230                 return (NULL);
1231         } else {
1232                 struct inpcbporthead *porthash;
1233                 struct inpcbport *phd;
1234                 struct inpcb *match = NULL;
1235                 /*
1236                  * Best fit PCB lookup.
1237                  *
1238                  * First see if this local port is in use by looking on the
1239                  * port hash list.
1240                  */
1241                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
1242                     pcbinfo->ipi_porthashmask)];
1243                 LIST_FOREACH(phd, porthash, phd_hash) {
1244                         if (phd->phd_port == lport)
1245                                 break;
1246                 }
1247                 if (phd != NULL) {
1248                         /*
1249                          * Port is in use by one or more PCBs. Look for best
1250                          * fit.
1251                          */
1252                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1253                                 wildcard = 0;
1254                                 if (cred != NULL &&
1255                                     !prison_equal_ip4(inp->inp_cred->cr_prison,
1256                                         cred->cr_prison))
1257                                         continue;
1258 #ifdef INET6
1259                                 /* XXX inp locking */
1260                                 if ((inp->inp_vflag & INP_IPV4) == 0)
1261                                         continue;
1262                                 /*
1263                                  * We never select the PCB that has
1264                                  * INP_IPV6 flag and is bound to :: if
1265                                  * we have another PCB which is bound
1266                                  * to 0.0.0.0.  If a PCB has the
1267                                  * INP_IPV6 flag, then we set its cost
1268                                  * higher than IPv4 only PCBs.
1269                                  *
1270                                  * Note that the case only happens
1271                                  * when a socket is bound to ::, under
1272                                  * the condition that the use of the
1273                                  * mapped address is allowed.
1274                                  */
1275                                 if ((inp->inp_vflag & INP_IPV6) != 0)
1276                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
1277 #endif
1278                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
1279                                         wildcard++;
1280                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
1281                                         if (laddr.s_addr == INADDR_ANY)
1282                                                 wildcard++;
1283                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
1284                                                 continue;
1285                                 } else {
1286                                         if (laddr.s_addr != INADDR_ANY)
1287                                                 wildcard++;
1288                                 }
1289                                 if (wildcard < matchwild) {
1290                                         match = inp;
1291                                         matchwild = wildcard;
1292                                         if (matchwild == 0)
1293                                                 break;
1294                                 }
1295                         }
1296                 }
1297                 return (match);
1298         }
1299 }
1300 #undef INP_LOOKUP_MAPPED_PCB_COST
1301
1302 /*
1303  * Lookup PCB in hash list.
1304  */
1305 struct inpcb *
1306 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1307     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int wildcard,
1308     struct ifnet *ifp)
1309 {
1310         struct inpcbhead *head;
1311         struct inpcb *inp, *tmpinp;
1312         u_short fport = fport_arg, lport = lport_arg;
1313
1314         INP_INFO_LOCK_ASSERT(pcbinfo);
1315
1316         /*
1317          * First look for an exact match.
1318          */
1319         tmpinp = NULL;
1320         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1321             pcbinfo->ipi_hashmask)];
1322         LIST_FOREACH(inp, head, inp_hash) {
1323 #ifdef INET6
1324                 /* XXX inp locking */
1325                 if ((inp->inp_vflag & INP_IPV4) == 0)
1326                         continue;
1327 #endif
1328                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1329                     inp->inp_laddr.s_addr == laddr.s_addr &&
1330                     inp->inp_fport == fport &&
1331                     inp->inp_lport == lport) {
1332                         /*
1333                          * XXX We should be able to directly return
1334                          * the inp here, without any checks.
1335                          * Well unless both bound with SO_REUSEPORT?
1336                          */
1337                         if (prison_flag(inp->inp_cred, PR_IP4))
1338                                 return (inp);
1339                         if (tmpinp == NULL)
1340                                 tmpinp = inp;
1341                 }
1342         }
1343         if (tmpinp != NULL)
1344                 return (tmpinp);
1345
1346         /*
1347          * Then look for a wildcard match, if requested.
1348          */
1349         if (wildcard == INPLOOKUP_WILDCARD) {
1350                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1351 #ifdef INET6
1352                 struct inpcb *local_wild_mapped = NULL;
1353 #endif
1354                 struct inpcb *jail_wild = NULL;
1355                 int injail;
1356
1357                 /*
1358                  * Order of socket selection - we always prefer jails.
1359                  *      1. jailed, non-wild.
1360                  *      2. jailed, wild.
1361                  *      3. non-jailed, non-wild.
1362                  *      4. non-jailed, wild.
1363                  */
1364
1365                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1366                     0, pcbinfo->ipi_hashmask)];
1367                 LIST_FOREACH(inp, head, inp_hash) {
1368 #ifdef INET6
1369                         /* XXX inp locking */
1370                         if ((inp->inp_vflag & INP_IPV4) == 0)
1371                                 continue;
1372 #endif
1373                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1374                             inp->inp_lport != lport)
1375                                 continue;
1376
1377                         /* XXX inp locking */
1378                         if (ifp && ifp->if_type == IFT_FAITH &&
1379                             (inp->inp_flags & INP_FAITH) == 0)
1380                                 continue;
1381
1382                         injail = prison_flag(inp->inp_cred, PR_IP4);
1383                         if (injail) {
1384                                 if (prison_check_ip4(inp->inp_cred,
1385                                     &laddr) != 0)
1386                                         continue;
1387                         } else {
1388                                 if (local_exact != NULL)
1389                                         continue;
1390                         }
1391
1392                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1393                                 if (injail)
1394                                         return (inp);
1395                                 else
1396                                         local_exact = inp;
1397                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1398 #ifdef INET6
1399                                 /* XXX inp locking, NULL check */
1400                                 if (inp->inp_vflag & INP_IPV6PROTO)
1401                                         local_wild_mapped = inp;
1402                                 else
1403 #endif /* INET6 */
1404                                         if (injail)
1405                                                 jail_wild = inp;
1406                                         else
1407                                                 local_wild = inp;
1408                         }
1409                 } /* LIST_FOREACH */
1410                 if (jail_wild != NULL)
1411                         return (jail_wild);
1412                 if (local_exact != NULL)
1413                         return (local_exact);
1414                 if (local_wild != NULL)
1415                         return (local_wild);
1416 #ifdef INET6
1417                 if (local_wild_mapped != NULL)
1418                         return (local_wild_mapped);
1419 #endif /* defined(INET6) */
1420         } /* if (wildcard == INPLOOKUP_WILDCARD) */
1421
1422         return (NULL);
1423 }
1424
1425 /*
1426  * Insert PCB onto various hash lists.
1427  */
1428 int
1429 in_pcbinshash(struct inpcb *inp)
1430 {
1431         struct inpcbhead *pcbhash;
1432         struct inpcbporthead *pcbporthash;
1433         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1434         struct inpcbport *phd;
1435         u_int32_t hashkey_faddr;
1436
1437         INP_INFO_WLOCK_ASSERT(pcbinfo);
1438         INP_WLOCK_ASSERT(inp);
1439         KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
1440             ("in_pcbinshash: INP_INHASHLIST"));
1441
1442 #ifdef INET6
1443         if (inp->inp_vflag & INP_IPV6)
1444                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1445         else
1446 #endif /* INET6 */
1447         hashkey_faddr = inp->inp_faddr.s_addr;
1448
1449         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1450                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1451
1452         pcbporthash = &pcbinfo->ipi_porthashbase[
1453             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
1454
1455         /*
1456          * Go through port list and look for a head for this lport.
1457          */
1458         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1459                 if (phd->phd_port == inp->inp_lport)
1460                         break;
1461         }
1462         /*
1463          * If none exists, malloc one and tack it on.
1464          */
1465         if (phd == NULL) {
1466                 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1467                 if (phd == NULL) {
1468                         return (ENOBUFS); /* XXX */
1469                 }
1470                 phd->phd_port = inp->inp_lport;
1471                 LIST_INIT(&phd->phd_pcblist);
1472                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1473         }
1474         inp->inp_phd = phd;
1475         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1476         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1477         inp->inp_flags |= INP_INHASHLIST;
1478         return (0);
1479 }
1480
1481 /*
1482  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1483  * changed. NOTE: This does not handle the case of the lport changing (the
1484  * hashed port list would have to be updated as well), so the lport must
1485  * not change after in_pcbinshash() has been called.
1486  */
1487 void
1488 in_pcbrehash(struct inpcb *inp)
1489 {
1490         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1491         struct inpcbhead *head;
1492         u_int32_t hashkey_faddr;
1493
1494         INP_INFO_WLOCK_ASSERT(pcbinfo);
1495         INP_WLOCK_ASSERT(inp);
1496         KASSERT(inp->inp_flags & INP_INHASHLIST,
1497             ("in_pcbrehash: !INP_INHASHLIST"));
1498
1499 #ifdef INET6
1500         if (inp->inp_vflag & INP_IPV6)
1501                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1502         else
1503 #endif /* INET6 */
1504         hashkey_faddr = inp->inp_faddr.s_addr;
1505
1506         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1507                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1508
1509         LIST_REMOVE(inp, inp_hash);
1510         LIST_INSERT_HEAD(head, inp, inp_hash);
1511 }
1512
1513 /*
1514  * Remove PCB from various lists.
1515  */
1516 static void
1517 in_pcbremlists(struct inpcb *inp)
1518 {
1519         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1520
1521         INP_INFO_WLOCK_ASSERT(pcbinfo);
1522         INP_WLOCK_ASSERT(inp);
1523
1524         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1525         if (inp->inp_flags & INP_INHASHLIST) {
1526                 struct inpcbport *phd = inp->inp_phd;
1527
1528                 LIST_REMOVE(inp, inp_hash);
1529                 LIST_REMOVE(inp, inp_portlist);
1530                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1531                         LIST_REMOVE(phd, phd_hash);
1532                         free(phd, M_PCB);
1533                 }
1534                 inp->inp_flags &= ~INP_INHASHLIST;
1535         }
1536         LIST_REMOVE(inp, inp_list);
1537         pcbinfo->ipi_count--;
1538 }
1539
1540 /*
1541  * A set label operation has occurred at the socket layer, propagate the
1542  * label change into the in_pcb for the socket.
1543  */
1544 void
1545 in_pcbsosetlabel(struct socket *so)
1546 {
1547 #ifdef MAC
1548         struct inpcb *inp;
1549
1550         inp = sotoinpcb(so);
1551         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
1552
1553         INP_WLOCK(inp);
1554         SOCK_LOCK(so);
1555         mac_inpcb_sosetlabel(so, inp);
1556         SOCK_UNLOCK(so);
1557         INP_WUNLOCK(inp);
1558 #endif
1559 }
1560
1561 /*
1562  * ipport_tick runs once per second, determining if random port allocation
1563  * should be continued.  If more than ipport_randomcps ports have been
1564  * allocated in the last second, then we return to sequential port
1565  * allocation. We return to random allocation only once we drop below
1566  * ipport_randomcps for at least ipport_randomtime seconds.
1567  */
1568 void
1569 ipport_tick(void *xtp)
1570 {
1571         VNET_ITERATOR_DECL(vnet_iter);
1572
1573         VNET_LIST_RLOCK_NOSLEEP();
1574         VNET_FOREACH(vnet_iter) {
1575                 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
1576                 if (V_ipport_tcpallocs <=
1577                     V_ipport_tcplastcount + V_ipport_randomcps) {
1578                         if (V_ipport_stoprandom > 0)
1579                                 V_ipport_stoprandom--;
1580                 } else
1581                         V_ipport_stoprandom = V_ipport_randomtime;
1582                 V_ipport_tcplastcount = V_ipport_tcpallocs;
1583                 CURVNET_RESTORE();
1584         }
1585         VNET_LIST_RUNLOCK_NOSLEEP();
1586         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
1587 }
1588
1589 void
1590 inp_wlock(struct inpcb *inp)
1591 {
1592
1593         INP_WLOCK(inp);
1594 }
1595
1596 void
1597 inp_wunlock(struct inpcb *inp)
1598 {
1599
1600         INP_WUNLOCK(inp);
1601 }
1602
1603 void
1604 inp_rlock(struct inpcb *inp)
1605 {
1606
1607         INP_RLOCK(inp);
1608 }
1609
1610 void
1611 inp_runlock(struct inpcb *inp)
1612 {
1613
1614         INP_RUNLOCK(inp);
1615 }
1616
1617 #ifdef INVARIANTS
1618 void
1619 inp_lock_assert(struct inpcb *inp)
1620 {
1621
1622         INP_WLOCK_ASSERT(inp);
1623 }
1624
1625 void
1626 inp_unlock_assert(struct inpcb *inp)
1627 {
1628
1629         INP_UNLOCK_ASSERT(inp);
1630 }
1631 #endif
1632
1633 void
1634 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
1635 {
1636         struct inpcb *inp;
1637
1638         INP_INFO_RLOCK(&V_tcbinfo);
1639         LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
1640                 INP_WLOCK(inp);
1641                 func(inp, arg);
1642                 INP_WUNLOCK(inp);
1643         }
1644         INP_INFO_RUNLOCK(&V_tcbinfo);
1645 }
1646
1647 struct socket *
1648 inp_inpcbtosocket(struct inpcb *inp)
1649 {
1650
1651         INP_WLOCK_ASSERT(inp);
1652         return (inp->inp_socket);
1653 }
1654
1655 struct tcpcb *
1656 inp_inpcbtotcpcb(struct inpcb *inp)
1657 {
1658
1659         INP_WLOCK_ASSERT(inp);
1660         return ((struct tcpcb *)inp->inp_ppcb);
1661 }
1662
1663 int
1664 inp_ip_tos_get(const struct inpcb *inp)
1665 {
1666
1667         return (inp->inp_ip_tos);
1668 }
1669
1670 void
1671 inp_ip_tos_set(struct inpcb *inp, int val)
1672 {
1673
1674         inp->inp_ip_tos = val;
1675 }
1676
1677 void
1678 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
1679     uint32_t *faddr, uint16_t *fp)
1680 {
1681
1682         INP_LOCK_ASSERT(inp);
1683         *laddr = inp->inp_laddr.s_addr;
1684         *faddr = inp->inp_faddr.s_addr;
1685         *lp = inp->inp_lport;
1686         *fp = inp->inp_fport;
1687 }
1688
1689 struct inpcb *
1690 so_sotoinpcb(struct socket *so)
1691 {
1692
1693         return (sotoinpcb(so));
1694 }
1695
1696 struct tcpcb *
1697 so_sototcpcb(struct socket *so)
1698 {
1699
1700         return (sototcpcb(so));
1701 }
1702
1703 #ifdef DDB
1704 static void
1705 db_print_indent(int indent)
1706 {
1707         int i;
1708
1709         for (i = 0; i < indent; i++)
1710                 db_printf(" ");
1711 }
1712
1713 static void
1714 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
1715 {
1716         char faddr_str[48], laddr_str[48];
1717
1718         db_print_indent(indent);
1719         db_printf("%s at %p\n", name, inc);
1720
1721         indent += 2;
1722
1723 #ifdef INET6
1724         if (inc->inc_flags & INC_ISIPV6) {
1725                 /* IPv6. */
1726                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
1727                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
1728         } else {
1729 #endif
1730                 /* IPv4. */
1731                 inet_ntoa_r(inc->inc_laddr, laddr_str);
1732                 inet_ntoa_r(inc->inc_faddr, faddr_str);
1733 #ifdef INET6
1734         }
1735 #endif
1736         db_print_indent(indent);
1737         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
1738             ntohs(inc->inc_lport));
1739         db_print_indent(indent);
1740         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
1741             ntohs(inc->inc_fport));
1742 }
1743
1744 static void
1745 db_print_inpflags(int inp_flags)
1746 {
1747         int comma;
1748
1749         comma = 0;
1750         if (inp_flags & INP_RECVOPTS) {
1751                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
1752                 comma = 1;
1753         }
1754         if (inp_flags & INP_RECVRETOPTS) {
1755                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
1756                 comma = 1;
1757         }
1758         if (inp_flags & INP_RECVDSTADDR) {
1759                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
1760                 comma = 1;
1761         }
1762         if (inp_flags & INP_HDRINCL) {
1763                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
1764                 comma = 1;
1765         }
1766         if (inp_flags & INP_HIGHPORT) {
1767                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
1768                 comma = 1;
1769         }
1770         if (inp_flags & INP_LOWPORT) {
1771                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
1772                 comma = 1;
1773         }
1774         if (inp_flags & INP_ANONPORT) {
1775                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
1776                 comma = 1;
1777         }
1778         if (inp_flags & INP_RECVIF) {
1779                 db_printf("%sINP_RECVIF", comma ? ", " : "");
1780                 comma = 1;
1781         }
1782         if (inp_flags & INP_MTUDISC) {
1783                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
1784                 comma = 1;
1785         }
1786         if (inp_flags & INP_FAITH) {
1787                 db_printf("%sINP_FAITH", comma ? ", " : "");
1788                 comma = 1;
1789         }
1790         if (inp_flags & INP_RECVTTL) {
1791                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
1792                 comma = 1;
1793         }
1794         if (inp_flags & INP_DONTFRAG) {
1795                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
1796                 comma = 1;
1797         }
1798         if (inp_flags & IN6P_IPV6_V6ONLY) {
1799                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
1800                 comma = 1;
1801         }
1802         if (inp_flags & IN6P_PKTINFO) {
1803                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
1804                 comma = 1;
1805         }
1806         if (inp_flags & IN6P_HOPLIMIT) {
1807                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
1808                 comma = 1;
1809         }
1810         if (inp_flags & IN6P_HOPOPTS) {
1811                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
1812                 comma = 1;
1813         }
1814         if (inp_flags & IN6P_DSTOPTS) {
1815                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
1816                 comma = 1;
1817         }
1818         if (inp_flags & IN6P_RTHDR) {
1819                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
1820                 comma = 1;
1821         }
1822         if (inp_flags & IN6P_RTHDRDSTOPTS) {
1823                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
1824                 comma = 1;
1825         }
1826         if (inp_flags & IN6P_TCLASS) {
1827                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
1828                 comma = 1;
1829         }
1830         if (inp_flags & IN6P_AUTOFLOWLABEL) {
1831                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
1832                 comma = 1;
1833         }
1834         if (inp_flags & INP_TIMEWAIT) {
1835                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
1836                 comma  = 1;
1837         }
1838         if (inp_flags & INP_ONESBCAST) {
1839                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
1840                 comma  = 1;
1841         }
1842         if (inp_flags & INP_DROPPED) {
1843                 db_printf("%sINP_DROPPED", comma ? ", " : "");
1844                 comma  = 1;
1845         }
1846         if (inp_flags & INP_SOCKREF) {
1847                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
1848                 comma  = 1;
1849         }
1850         if (inp_flags & IN6P_RFC2292) {
1851                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
1852                 comma = 1;
1853         }
1854         if (inp_flags & IN6P_MTU) {
1855                 db_printf("IN6P_MTU%s", comma ? ", " : "");
1856                 comma = 1;
1857         }
1858 }
1859
1860 static void
1861 db_print_inpvflag(u_char inp_vflag)
1862 {
1863         int comma;
1864
1865         comma = 0;
1866         if (inp_vflag & INP_IPV4) {
1867                 db_printf("%sINP_IPV4", comma ? ", " : "");
1868                 comma  = 1;
1869         }
1870         if (inp_vflag & INP_IPV6) {
1871                 db_printf("%sINP_IPV6", comma ? ", " : "");
1872                 comma  = 1;
1873         }
1874         if (inp_vflag & INP_IPV6PROTO) {
1875                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
1876                 comma  = 1;
1877         }
1878 }
1879
1880 static void
1881 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
1882 {
1883
1884         db_print_indent(indent);
1885         db_printf("%s at %p\n", name, inp);
1886
1887         indent += 2;
1888
1889         db_print_indent(indent);
1890         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
1891
1892         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
1893
1894         db_print_indent(indent);
1895         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
1896             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
1897
1898         db_print_indent(indent);
1899         db_printf("inp_label: %p   inp_flags: 0x%x (",
1900            inp->inp_label, inp->inp_flags);
1901         db_print_inpflags(inp->inp_flags);
1902         db_printf(")\n");
1903
1904         db_print_indent(indent);
1905         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
1906             inp->inp_vflag);
1907         db_print_inpvflag(inp->inp_vflag);
1908         db_printf(")\n");
1909
1910         db_print_indent(indent);
1911         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
1912             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
1913
1914         db_print_indent(indent);
1915 #ifdef INET6
1916         if (inp->inp_vflag & INP_IPV6) {
1917                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
1918                     "in6p_moptions: %p\n", inp->in6p_options,
1919                     inp->in6p_outputopts, inp->in6p_moptions);
1920                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
1921                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
1922                     inp->in6p_hops);
1923         } else
1924 #endif
1925         {
1926                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
1927                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
1928                     inp->inp_options, inp->inp_moptions);
1929         }
1930
1931         db_print_indent(indent);
1932         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
1933             (uintmax_t)inp->inp_gencnt);
1934 }
1935
1936 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
1937 {
1938         struct inpcb *inp;
1939
1940         if (!have_addr) {
1941                 db_printf("usage: show inpcb <addr>\n");
1942                 return;
1943         }
1944         inp = (struct inpcb *)addr;
1945
1946         db_print_inpcb(inp, "inpcb", 0);
1947 }
1948 #endif