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  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   6  * All rights reserved.
   7  *
   8  * Portions of this software were developed by Robert N. M. Watson under
   9  * contract to Juniper Networks, Inc.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
  36  */
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include "opt_ddb.h"
  42 #include "opt_ipsec.h"
  43 #include "opt_inet.h"
  44 #include "opt_inet6.h"
  45 #include "opt_pcbgroup.h"
  46
  47 #include <sys/param.h>
  48 #include <sys/systm.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/callout.h>
  52 #include <sys/domain.h>
  53 #include <sys/protosw.h>
  54 #include <sys/socket.h>
  55 #include <sys/socketvar.h>
  56 #include <sys/priv.h>
  57 #include <sys/proc.h>
  58 #include <sys/refcount.h>
  59 #include <sys/jail.h>
  60 #include <sys/kernel.h>
  61 #include <sys/sysctl.h>
  62
  63 #ifdef DDB
  64 #include <ddb/ddb.h>
  65 #endif
  66
  67 #include <vm/uma.h>
  68
  69 #include <net/if.h>
  70 #include <net/if_types.h>
  71 #include <net/route.h>
  72 #include <net/vnet.h>
  73
  74 #if defined(INET) || defined(INET6)
  75 #include <netinet/in.h>
  76 #include <netinet/in_pcb.h>
  77 #include <netinet/ip_var.h>
  78 #include <netinet/tcp_var.h>
  79 #include <netinet/udp.h>
  80 #include <netinet/udp_var.h>
  81 #endif
  82 #ifdef INET
  83 #include <netinet/in_var.h>
  84 #endif
  85 #ifdef INET6
  86 #include <netinet/ip6.h>
  87 #include <netinet6/in6_pcb.h>
  88 #include <netinet6/in6_var.h>
  89 #include <netinet6/ip6_var.h>
  90 #endif /* INET6 */
  91
  92
  93 #ifdef IPSEC
  94 #include <netipsec/ipsec.h>
  95 #include <netipsec/key.h>
  96 #endif /* IPSEC */
  97
  98 #include <security/mac/mac_framework.h>
  99
 100 static struct callout   ipport_tick_callout;
 101
 102 /*
 103  * These configure the range of local port addresses assigned to
 104  * "unspecified" outgoing connections/packets/whatever.
 105  */
 106 VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1;    /* 1023 */
 107 VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART;    /* 600 */
 108 VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST;     /* 10000 */
 109 VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST;       /* 65535 */
 110 VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO;      /* 49152 */
 111 VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO;        /* 65535 */
 112
 113 /*
 114  * Reserved ports accessible only to root. There are significant
 115  * security considerations that must be accounted for when changing these,
 116  * but the security benefits can be great. Please be careful.
 117  */
 118 VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1;    /* 1023 */
 119 VNET_DEFINE(int, ipport_reservedlow);
 120
 121 /* Variables dealing with random ephemeral port allocation. */
 122 VNET_DEFINE(int, ipport_randomized) = 1;        /* user controlled via sysctl */
 123 VNET_DEFINE(int, ipport_randomcps) = 10;        /* user controlled via sysctl */
 124 VNET_DEFINE(int, ipport_randomtime) = 45;       /* user controlled via sysctl */
 125 VNET_DEFINE(int, ipport_stoprandom);            /* toggled by ipport_tick */
 126 VNET_DEFINE(int, ipport_tcpallocs);
 127 static VNET_DEFINE(int, ipport_tcplastcount);
 128
 129 #define V_ipport_tcplastcount           VNET(ipport_tcplastcount)
 130
 131 static void     in_pcbremlists(struct inpcb *inp);
 132 #ifdef INET
 133 static struct inpcb     *in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo,
 134                             struct in_addr faddr, u_int fport_arg,
 135                             struct in_addr laddr, u_int lport_arg,
 136                             int lookupflags, struct ifnet *ifp);
 137
 138 #define RANGECHK(var, min, max) \
 139         if ((var) < (min)) { (var) = (min); } \
 140         else if ((var) > (max)) { (var) = (max); }
 141
 142 static int
 143 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 144 {
 145         int error;
 146
 147 #ifdef VIMAGE
 148         error = vnet_sysctl_handle_int(oidp, arg1, arg2, req);
 149 #else
 150         error = sysctl_handle_int(oidp, arg1, arg2, req);
 151 #endif
 152         if (error == 0) {
 153                 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 154                 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 155                 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
 156                 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
 157                 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
 158                 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
 159         }
 160         return (error);
 161 }
 162
 163 #undef RANGECHK
 164
 165 static SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0,
 166     "IP Ports");
 167
 168 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst,
 169         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowfirstauto), 0,
 170         &sysctl_net_ipport_check, "I", "");
 171 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast,
 172         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowlastauto), 0,
 173         &sysctl_net_ipport_check, "I", "");
 174 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, first,
 175         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_firstauto), 0,
 176         &sysctl_net_ipport_check, "I", "");
 177 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, last,
 178         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lastauto), 0,
 179         &sysctl_net_ipport_check, "I", "");
 180 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst,
 181         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hifirstauto), 0,
 182         &sysctl_net_ipport_check, "I", "");
 183 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hilast,
 184         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hilastauto), 0,
 185         &sysctl_net_ipport_check, "I", "");
 186 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
 187         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedhigh), 0, "");
 188 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
 189         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, "");
 190 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
 191         &VNET_NAME(ipport_randomized), 0, "Enable random port allocation");
 192 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
 193         &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port "
 194         "allocations before switching to a sequental one");
 195 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
 196         &VNET_NAME(ipport_randomtime), 0,
 197         "Minimum time to keep sequental port "
 198         "allocation before switching to a random one");
 199 #endif
 200
 201 /*
 202  * in_pcb.c: manage the Protocol Control Blocks.
 203  *
 204  * NOTE: It is assumed that most of these functions will be called with
 205  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
 206  * functions often modify hash chains or addresses in pcbs.
 207  */
 208
 209 /*
 210  * Initialize an inpcbinfo -- we should be able to reduce the number of
 211  * arguments in time.
 212  */
 213 void
 214 in_pcbinfo_init(struct inpcbinfo *pcbinfo, const char *name,
 215     struct inpcbhead *listhead, int hash_nelements, int porthash_nelements,
 216     char *inpcbzone_name, uma_init inpcbzone_init, uma_fini inpcbzone_fini,
 217     uint32_t inpcbzone_flags, u_int hashfields)
 218 {
 219
 220         INP_INFO_LOCK_INIT(pcbinfo, name);
 221         INP_HASH_LOCK_INIT(pcbinfo, "pcbinfohash");     /* XXXRW: argument? */
 222 #ifdef VIMAGE
 223         pcbinfo->ipi_vnet = curvnet;
 224 #endif
 225         pcbinfo->ipi_listhead = listhead;
 226         LIST_INIT(pcbinfo->ipi_listhead);
 227         pcbinfo->ipi_count = 0;
 228         pcbinfo->ipi_hashbase = hashinit(hash_nelements, M_PCB,
 229             &pcbinfo->ipi_hashmask);
 230         pcbinfo->ipi_porthashbase = hashinit(porthash_nelements, M_PCB,
 231             &pcbinfo->ipi_porthashmask);
 232 #ifdef PCBGROUP
 233         in_pcbgroup_init(pcbinfo, hashfields, hash_nelements);
 234 #endif
 235         pcbinfo->ipi_zone = uma_zcreate(inpcbzone_name, sizeof(struct inpcb),
 236             NULL, NULL, inpcbzone_init, inpcbzone_fini, UMA_ALIGN_PTR,
 237             inpcbzone_flags);
 238         uma_zone_set_max(pcbinfo->ipi_zone, maxsockets);
 239 }
 240
 241 /*
 242  * Destroy an inpcbinfo.
 243  */
 244 void
 245 in_pcbinfo_destroy(struct inpcbinfo *pcbinfo)
 246 {
 247
 248         KASSERT(pcbinfo->ipi_count == 0,
 249             ("%s: ipi_count = %u", __func__, pcbinfo->ipi_count));
 250
 251         hashdestroy(pcbinfo->ipi_hashbase, M_PCB, pcbinfo->ipi_hashmask);
 252         hashdestroy(pcbinfo->ipi_porthashbase, M_PCB,
 253             pcbinfo->ipi_porthashmask);
 254 #ifdef PCBGROUP
 255         in_pcbgroup_destroy(pcbinfo);
 256 #endif
 257         uma_zdestroy(pcbinfo->ipi_zone);
 258         INP_HASH_LOCK_DESTROY(pcbinfo);
 259         INP_INFO_LOCK_DESTROY(pcbinfo);
 260 }
 261
 262 /*
 263  * Allocate a PCB and associate it with the socket.
 264  * On success return with the PCB locked.
 265  */
 266 int
 267 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 268 {
 269         struct inpcb *inp;
 270         int error;
 271
 272         INP_INFO_WLOCK_ASSERT(pcbinfo);
 273         error = 0;
 274         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
 275         if (inp == NULL)
 276                 return (ENOBUFS);
 277         bzero(inp, inp_zero_size);
 278         inp->inp_pcbinfo = pcbinfo;
 279         inp->inp_socket = so;
 280         inp->inp_cred = crhold(so->so_cred);
 281         inp->inp_inc.inc_fibnum = so->so_fibnum;
 282 #ifdef MAC
 283         error = mac_inpcb_init(inp, M_NOWAIT);
 284         if (error != 0)
 285                 goto out;
 286         mac_inpcb_create(so, inp);
 287 #endif
 288 #ifdef IPSEC
 289         error = ipsec_init_policy(so, &inp->inp_sp);
 290         if (error != 0) {
 291 #ifdef MAC
 292                 mac_inpcb_destroy(inp);
 293 #endif
 294                 goto out;
 295         }
 296 #endif /*IPSEC*/
 297 #ifdef INET6
 298         if (INP_SOCKAF(so) == AF_INET6) {
 299                 inp->inp_vflag |= INP_IPV6PROTO;
 300                 if (V_ip6_v6only)
 301                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 302         }
 303 #endif
 304         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
 305         pcbinfo->ipi_count++;
 306         so->so_pcb = (caddr_t)inp;
 307 #ifdef INET6
 308         if (V_ip6_auto_flowlabel)
 309                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 310 #endif
 311         INP_WLOCK(inp);
 312         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 313         refcount_init(&inp->inp_refcount, 1);   /* Reference from inpcbinfo */
 314 #if defined(IPSEC) || defined(MAC)
 315 out:
 316         if (error != 0) {
 317                 crfree(inp->inp_cred);
 318                 uma_zfree(pcbinfo->ipi_zone, inp);
 319         }
 320 #endif
 321         return (error);
 322 }
 323
 324 #ifdef INET
 325 int
 326 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 327 {
 328         int anonport, error;
 329
 330         INP_WLOCK_ASSERT(inp);
 331         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 332
 333         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 334                 return (EINVAL);
 335         anonport = inp->inp_lport == 0 && (nam == NULL ||
 336             ((struct sockaddr_in *)nam)->sin_port == 0);
 337         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 338             &inp->inp_lport, cred);
 339         if (error)
 340                 return (error);
 341         if (in_pcbinshash(inp) != 0) {
 342                 inp->inp_laddr.s_addr = INADDR_ANY;
 343                 inp->inp_lport = 0;
 344                 return (EAGAIN);
 345         }
 346         if (anonport)
 347                 inp->inp_flags |= INP_ANONPORT;
 348         return (0);
 349 }
 350 #endif
 351
 352 #if defined(INET) || defined(INET6)
 353 int
 354 in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp,
 355     struct ucred *cred, int lookupflags)
 356 {
 357         struct inpcbinfo *pcbinfo;
 358         struct inpcb *tmpinp;
 359         unsigned short *lastport;
 360         int count, dorandom, error;
 361         u_short aux, first, last, lport;
 362 #ifdef INET
 363         struct in_addr laddr;
 364 #endif
 365
 366         pcbinfo = inp->inp_pcbinfo;
 367
 368         /*
 369          * Because no actual state changes occur here, a global write lock on
 370          * the pcbinfo isn't required.
 371          */
 372         INP_LOCK_ASSERT(inp);
 373         INP_HASH_LOCK_ASSERT(pcbinfo);
 374
 375         if (inp->inp_flags & INP_HIGHPORT) {
 376                 first = V_ipport_hifirstauto;   /* sysctl */
 377                 last  = V_ipport_hilastauto;
 378                 lastport = &pcbinfo->ipi_lasthi;
 379         } else if (inp->inp_flags & INP_LOWPORT) {
 380                 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
 381                 if (error)
 382                         return (error);
 383                 first = V_ipport_lowfirstauto;  /* 1023 */
 384                 last  = V_ipport_lowlastauto;   /* 600 */
 385                 lastport = &pcbinfo->ipi_lastlow;
 386         } else {
 387                 first = V_ipport_firstauto;     /* sysctl */
 388                 last  = V_ipport_lastauto;
 389                 lastport = &pcbinfo->ipi_lastport;
 390         }
 391         /*
 392          * For UDP, use random port allocation as long as the user
 393          * allows it.  For TCP (and as of yet unknown) connections,
 394          * use random port allocation only if the user allows it AND
 395          * ipport_tick() allows it.
 396          */
 397         if (V_ipport_randomized &&
 398                 (!V_ipport_stoprandom || pcbinfo == &V_udbinfo))
 399                 dorandom = 1;
 400         else
 401                 dorandom = 0;
 402         /*
 403          * It makes no sense to do random port allocation if
 404          * we have the only port available.
 405          */
 406         if (first == last)
 407                 dorandom = 0;
 408         /* Make sure to not include UDP packets in the count. */
 409         if (pcbinfo != &V_udbinfo)
 410                 V_ipport_tcpallocs++;
 411         /*
 412          * Instead of having two loops further down counting up or down
 413          * make sure that first is always <= last and go with only one
 414          * code path implementing all logic.
 415          */
 416         if (first > last) {
 417                 aux = first;
 418                 first = last;
 419                 last = aux;
 420         }
 421
 422 #ifdef INET
 423         /* Make the compiler happy. */
 424         laddr.s_addr = 0;
 425         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) {
 426                 KASSERT(laddrp != NULL, ("%s: laddrp NULL for v4 inp %p",
 427                     __func__, inp));
 428                 laddr = *laddrp;
 429         }
 430 #endif
 431         tmpinp = NULL;  /* Make compiler happy. */
 432         lport = *lportp;
 433
 434         if (dorandom)
 435                 *lastport = first + (arc4random() % (last - first));
 436
 437         count = last - first;
 438
 439         do {
 440                 if (count-- < 0)        /* completely used? */
 441                         return (EADDRNOTAVAIL);
 442                 ++*lastport;
 443                 if (*lastport < first || *lastport > last)
 444                         *lastport = first;
 445                 lport = htons(*lastport);
 446
 447 #ifdef INET6
 448                 if ((inp->inp_vflag & INP_IPV6) != 0)
 449                         tmpinp = in6_pcblookup_local(pcbinfo,
 450                             &inp->in6p_laddr, lport, lookupflags, cred);
 451 #endif
 452 #if defined(INET) && defined(INET6)
 453                 else
 454 #endif
 455 #ifdef INET
 456                         tmpinp = in_pcblookup_local(pcbinfo, laddr,
 457                             lport, lookupflags, cred);
 458 #endif
 459         } while (tmpinp != NULL);
 460
 461 #ifdef INET
 462         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4)
 463                 laddrp->s_addr = laddr.s_addr;
 464 #endif
 465         *lportp = lport;
 466
 467         return (0);
 468 }
 469 #endif /* INET || INET6 */
 470
 471 #ifdef INET
 472 /*
 473  * Set up a bind operation on a PCB, performing port allocation
 474  * as required, but do not actually modify the PCB. Callers can
 475  * either complete the bind by setting inp_laddr/inp_lport and
 476  * calling in_pcbinshash(), or they can just use the resulting
 477  * port and address to authorise the sending of a once-off packet.
 478  *
 479  * On error, the values of *laddrp and *lportp are not changed.
 480  */
 481 int
 482 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 483     u_short *lportp, struct ucred *cred)
 484 {
 485         struct socket *so = inp->inp_socket;
 486         struct sockaddr_in *sin;
 487         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 488         struct in_addr laddr;
 489         u_short lport = 0;
 490         int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT);
 491         int error;
 492
 493         /*
 494          * No state changes, so read locks are sufficient here.
 495          */
 496         INP_LOCK_ASSERT(inp);
 497         INP_HASH_LOCK_ASSERT(pcbinfo);
 498
 499         if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
 500                 return (EADDRNOTAVAIL);
 501         laddr.s_addr = *laddrp;
 502         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 503                 return (EINVAL);
 504         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 505                 lookupflags = INPLOOKUP_WILDCARD;
 506         if (nam == NULL) {
 507                 if ((error = prison_local_ip4(cred, &laddr)) != 0)
 508                         return (error);
 509         } else {
 510                 sin = (struct sockaddr_in *)nam;
 511                 if (nam->sa_len != sizeof (*sin))
 512                         return (EINVAL);
 513 #ifdef notdef
 514                 /*
 515                  * We should check the family, but old programs
 516                  * incorrectly fail to initialize it.
 517                  */
 518                 if (sin->sin_family != AF_INET)
 519                         return (EAFNOSUPPORT);
 520 #endif
 521                 error = prison_local_ip4(cred, &sin->sin_addr);
 522                 if (error)
 523                         return (error);
 524                 if (sin->sin_port != *lportp) {
 525                         /* Don't allow the port to change. */
 526                         if (*lportp != 0)
 527                                 return (EINVAL);
 528                         lport = sin->sin_port;
 529                 }
 530                 /* NB: lport is left as 0 if the port isn't being changed. */
 531                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 532                         /*
 533                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 534                          * allow complete duplication of binding if
 535                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 536                          * and a multicast address is bound on both
 537                          * new and duplicated sockets.
 538                          */
 539                         if (so->so_options & SO_REUSEADDR)
 540                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 541                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 542                         sin->sin_port = 0;              /* yech... */
 543                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 544                         /*
 545                          * Is the address a local IP address?
 546                          * If INP_BINDANY is set, then the socket may be bound
 547                          * to any endpoint address, local or not.
 548                          */
 549                         if ((inp->inp_flags & INP_BINDANY) == 0 &&
 550                             ifa_ifwithaddr_check((struct sockaddr *)sin) == 0)
 551                                 return (EADDRNOTAVAIL);
 552                 }
 553                 laddr = sin->sin_addr;
 554                 if (lport) {
 555                         struct inpcb *t;
 556                         struct tcptw *tw;
 557
 558                         /* GROSS */
 559                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 560                             ntohs(lport) >= V_ipport_reservedlow &&
 561                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 562                             0))
 563                                 return (EACCES);
 564                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 565                             priv_check_cred(inp->inp_cred,
 566                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 567                                 t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 568                                     lport, INPLOOKUP_WILDCARD, cred);
 569         /*
 570          * XXX
 571          * This entire block sorely needs a rewrite.
 572          */
 573                                 if (t &&
 574                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 575                                     (so->so_type != SOCK_STREAM ||
 576                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
 577                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
 578                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 579                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
 580                                     (inp->inp_cred->cr_uid !=
 581                                      t->inp_cred->cr_uid))
 582                                         return (EADDRINUSE);
 583                         }
 584                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 585                             lport, lookupflags, cred);
 586                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 587                                 /*
 588                                  * XXXRW: If an incpb has had its timewait
 589                                  * state recycled, we treat the address as
 590                                  * being in use (for now).  This is better
 591                                  * than a panic, but not desirable.
 592                                  */
 593                                 tw = intotw(t);
 594                                 if (tw == NULL ||
 595                                     (reuseport & tw->tw_so_options) == 0)
 596                                         return (EADDRINUSE);
 597                         } else if (t && (reuseport == 0 ||
 598                             (t->inp_flags2 & INP_REUSEPORT) == 0)) {
 599 #ifdef INET6
 600                                 if (ntohl(sin->sin_addr.s_addr) !=
 601                                     INADDR_ANY ||
 602                                     ntohl(t->inp_laddr.s_addr) !=
 603                                     INADDR_ANY ||
 604                                     (inp->inp_vflag & INP_IPV6PROTO) == 0 ||
 605                                     (t->inp_vflag & INP_IPV6PROTO) == 0)
 606 #endif
 607                                 return (EADDRINUSE);
 608                         }
 609                 }
 610         }
 611         if (*lportp != 0)
 612                 lport = *lportp;
 613         if (lport == 0) {
 614                 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags);
 615                 if (error != 0)
 616                         return (error);
 617
 618         }
 619         *laddrp = laddr.s_addr;
 620         *lportp = lport;
 621         return (0);
 622 }
 623
 624 /*
 625  * Connect from a socket to a specified address.
 626  * Both address and port must be specified in argument sin.
 627  * If don't have a local address for this socket yet,
 628  * then pick one.
 629  */
 630 int
 631 in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
 632     struct ucred *cred, struct mbuf *m)
 633 {
 634         u_short lport, fport;
 635         in_addr_t laddr, faddr;
 636         int anonport, error;
 637
 638         INP_WLOCK_ASSERT(inp);
 639         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 640
 641         lport = inp->inp_lport;
 642         laddr = inp->inp_laddr.s_addr;
 643         anonport = (lport == 0);
 644         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 645             NULL, cred);
 646         if (error)
 647                 return (error);
 648
 649         /* Do the initial binding of the local address if required. */
 650         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 651                 inp->inp_lport = lport;
 652                 inp->inp_laddr.s_addr = laddr;
 653                 if (in_pcbinshash(inp) != 0) {
 654                         inp->inp_laddr.s_addr = INADDR_ANY;
 655                         inp->inp_lport = 0;
 656                         return (EAGAIN);
 657                 }
 658         }
 659
 660         /* Commit the remaining changes. */
 661         inp->inp_lport = lport;
 662         inp->inp_laddr.s_addr = laddr;
 663         inp->inp_faddr.s_addr = faddr;
 664         inp->inp_fport = fport;
 665         in_pcbrehash_mbuf(inp, m);
 666
 667         if (anonport)
 668                 inp->inp_flags |= INP_ANONPORT;
 669         return (0);
 670 }
 671
 672 int
 673 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 674 {
 675
 676         return (in_pcbconnect_mbuf(inp, nam, cred, NULL));
 677 }
 678
 679 /*
 680  * Do proper source address selection on an unbound socket in case
 681  * of connect. Take jails into account as well.
 682  */
 683 static int
 684 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
 685     struct ucred *cred)
 686 {
 687         struct ifaddr *ifa;
 688         struct sockaddr *sa;
 689         struct sockaddr_in *sin;
 690         struct route sro;
 691         int error;
 692
 693         KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
 694
 695         /*
 696          * Bypass source address selection and use the primary jail IP
 697          * if requested.
 698          */
 699         if (cred != NULL && !prison_saddrsel_ip4(cred, laddr))
 700                 return (0);
 701
 702         error = 0;
 703         bzero(&sro, sizeof(sro));
 704
 705         sin = (struct sockaddr_in *)&sro.ro_dst;
 706         sin->sin_family = AF_INET;
 707         sin->sin_len = sizeof(struct sockaddr_in);
 708         sin->sin_addr.s_addr = faddr->s_addr;
 709
 710         /*
 711          * If route is known our src addr is taken from the i/f,
 712          * else punt.
 713          *
 714          * Find out route to destination.
 715          */
 716         if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 717                 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
 718
 719         /*
 720          * If we found a route, use the address corresponding to
 721          * the outgoing interface.
 722          *
 723          * Otherwise assume faddr is reachable on a directly connected
 724          * network and try to find a corresponding interface to take
 725          * the source address from.
 726          */
 727         if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
 728                 struct in_ifaddr *ia;
 729                 struct ifnet *ifp;
 730
 731                 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin));
 732                 if (ia == NULL)
 733                         ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0));
 734                 if (ia == NULL) {
 735                         error = ENETUNREACH;
 736                         goto done;
 737                 }
 738
 739                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 740                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 741                         ifa_free(&ia->ia_ifa);
 742                         goto done;
 743                 }
 744
 745                 ifp = ia->ia_ifp;
 746                 ifa_free(&ia->ia_ifa);
 747                 ia = NULL;
 748                 IF_ADDR_RLOCK(ifp);
 749                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 750
 751                         sa = ifa->ifa_addr;
 752                         if (sa->sa_family != AF_INET)
 753                                 continue;
 754                         sin = (struct sockaddr_in *)sa;
 755                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 756                                 ia = (struct in_ifaddr *)ifa;
 757                                 break;
 758                         }
 759                 }
 760                 if (ia != NULL) {
 761                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 762                         IF_ADDR_RUNLOCK(ifp);
 763                         goto done;
 764                 }
 765                 IF_ADDR_RUNLOCK(ifp);
 766
 767                 /* 3. As a last resort return the 'default' jail address. */
 768                 error = prison_get_ip4(cred, laddr);
 769                 goto done;
 770         }
 771
 772         /*
 773          * If the outgoing interface on the route found is not
 774          * a loopback interface, use the address from that interface.
 775          * In case of jails do those three steps:
 776          * 1. check if the interface address belongs to the jail. If so use it.
 777          * 2. check if we have any address on the outgoing interface
 778          *    belonging to this jail. If so use it.
 779          * 3. as a last resort return the 'default' jail address.
 780          */
 781         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
 782                 struct in_ifaddr *ia;
 783                 struct ifnet *ifp;
 784
 785                 /* If not jailed, use the default returned. */
 786                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 787                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 788                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 789                         goto done;
 790                 }
 791
 792                 /* Jailed. */
 793                 /* 1. Check if the iface address belongs to the jail. */
 794                 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
 795                 if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 796                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 797                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 798                         goto done;
 799                 }
 800
 801                 /*
 802                  * 2. Check if we have any address on the outgoing interface
 803                  *    belonging to this jail.
 804                  */
 805                 ia = NULL;
 806                 ifp = sro.ro_rt->rt_ifp;
 807                 IF_ADDR_RLOCK(ifp);
 808                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 809                         sa = ifa->ifa_addr;
 810                         if (sa->sa_family != AF_INET)
 811                                 continue;
 812                         sin = (struct sockaddr_in *)sa;
 813                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 814                                 ia = (struct in_ifaddr *)ifa;
 815                                 break;
 816                         }
 817                 }
 818                 if (ia != NULL) {
 819                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 820                         IF_ADDR_RUNLOCK(ifp);
 821                         goto done;
 822                 }
 823                 IF_ADDR_RUNLOCK(ifp);
 824
 825                 /* 3. As a last resort return the 'default' jail address. */
 826                 error = prison_get_ip4(cred, laddr);
 827                 goto done;
 828         }
 829
 830         /*
 831          * The outgoing interface is marked with 'loopback net', so a route
 832          * to ourselves is here.
 833          * Try to find the interface of the destination address and then
 834          * take the address from there. That interface is not necessarily
 835          * a loopback interface.
 836          * In case of jails, check that it is an address of the jail
 837          * and if we cannot find, fall back to the 'default' jail address.
 838          */
 839         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
 840                 struct sockaddr_in sain;
 841                 struct in_ifaddr *ia;
 842
 843                 bzero(&sain, sizeof(struct sockaddr_in));
 844                 sain.sin_family = AF_INET;
 845                 sain.sin_len = sizeof(struct sockaddr_in);
 846                 sain.sin_addr.s_addr = faddr->s_addr;
 847
 848                 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain)));
 849                 if (ia == NULL)
 850                         ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0));
 851                 if (ia == NULL)
 852                         ia = ifatoia(ifa_ifwithaddr(sintosa(&sain)));
 853
 854                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 855                         if (ia == NULL) {
 856                                 error = ENETUNREACH;
 857                                 goto done;
 858                         }
 859                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 860                         ifa_free(&ia->ia_ifa);
 861                         goto done;
 862                 }
 863
 864                 /* Jailed. */
 865                 if (ia != NULL) {
 866                         struct ifnet *ifp;
 867
 868                         ifp = ia->ia_ifp;
 869                         ifa_free(&ia->ia_ifa);
 870                         ia = NULL;
 871                         IF_ADDR_RLOCK(ifp);
 872                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 873
 874                                 sa = ifa->ifa_addr;
 875                                 if (sa->sa_family != AF_INET)
 876                                         continue;
 877                                 sin = (struct sockaddr_in *)sa;
 878                                 if (prison_check_ip4(cred,
 879                                     &sin->sin_addr) == 0) {
 880                                         ia = (struct in_ifaddr *)ifa;
 881                                         break;
 882                                 }
 883                         }
 884                         if (ia != NULL) {
 885                                 laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 886                                 IF_ADDR_RUNLOCK(ifp);
 887                                 goto done;
 888                         }
 889                         IF_ADDR_RUNLOCK(ifp);
 890                 }
 891
 892                 /* 3. As a last resort return the 'default' jail address. */
 893                 error = prison_get_ip4(cred, laddr);
 894                 goto done;
 895         }
 896
 897 done:
 898         if (sro.ro_rt != NULL)
 899                 RTFREE(sro.ro_rt);
 900         return (error);
 901 }
 902
 903 /*
 904  * Set up for a connect from a socket to the specified address.
 905  * On entry, *laddrp and *lportp should contain the current local
 906  * address and port for the PCB; these are updated to the values
 907  * that should be placed in inp_laddr and inp_lport to complete
 908  * the connect.
 909  *
 910  * On success, *faddrp and *fportp will be set to the remote address
 911  * and port. These are not updated in the error case.
 912  *
 913  * If the operation fails because the connection already exists,
 914  * *oinpp will be set to the PCB of that connection so that the
 915  * caller can decide to override it. In all other cases, *oinpp
 916  * is set to NULL.
 917  */
 918 int
 919 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 920     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 921     struct inpcb **oinpp, struct ucred *cred)
 922 {
 923         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 924         struct in_ifaddr *ia;
 925         struct inpcb *oinp;
 926         struct in_addr laddr, faddr;
 927         u_short lport, fport;
 928         int error;
 929
 930         /*
 931          * Because a global state change doesn't actually occur here, a read
 932          * lock is sufficient.
 933          */
 934         INP_LOCK_ASSERT(inp);
 935         INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo);
 936
 937         if (oinpp != NULL)
 938                 *oinpp = NULL;
 939         if (nam->sa_len != sizeof (*sin))
 940                 return (EINVAL);
 941         if (sin->sin_family != AF_INET)
 942                 return (EAFNOSUPPORT);
 943         if (sin->sin_port == 0)
 944                 return (EADDRNOTAVAIL);
 945         laddr.s_addr = *laddrp;
 946         lport = *lportp;
 947         faddr = sin->sin_addr;
 948         fport = sin->sin_port;
 949
 950         if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
 951                 /*
 952                  * If the destination address is INADDR_ANY,
 953                  * use the primary local address.
 954                  * If the supplied address is INADDR_BROADCAST,
 955                  * and the primary interface supports broadcast,
 956                  * choose the broadcast address for that interface.
 957                  */
 958                 if (faddr.s_addr == INADDR_ANY) {
 959                         IN_IFADDR_RLOCK();
 960                         faddr =
 961                             IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
 962                         IN_IFADDR_RUNLOCK();
 963                         if (cred != NULL &&
 964                             (error = prison_get_ip4(cred, &faddr)) != 0)
 965                                 return (error);
 966                 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
 967                         IN_IFADDR_RLOCK();
 968                         if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
 969                             IFF_BROADCAST)
 970                                 faddr = satosin(&TAILQ_FIRST(
 971                                     &V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
 972                         IN_IFADDR_RUNLOCK();
 973                 }
 974         }
 975         if (laddr.s_addr == INADDR_ANY) {
 976                 error = in_pcbladdr(inp, &faddr, &laddr, cred);
 977                 /*
 978                  * If the destination address is multicast and an outgoing
 979                  * interface has been set as a multicast option, prefer the
 980                  * address of that interface as our source address.
 981                  */
 982                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
 983                     inp->inp_moptions != NULL) {
 984                         struct ip_moptions *imo;
 985                         struct ifnet *ifp;
 986
 987                         imo = inp->inp_moptions;
 988                         if (imo->imo_multicast_ifp != NULL) {
 989                                 ifp = imo->imo_multicast_ifp;
 990                                 IN_IFADDR_RLOCK();
 991                                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
 992                                         if ((ia->ia_ifp == ifp) &&
 993                                             (cred == NULL ||
 994                                             prison_check_ip4(cred,
 995                                             &ia->ia_addr.sin_addr) == 0))
 996                                                 break;
 997                                 }
 998                                 if (ia == NULL)
 999                                         error = EADDRNOTAVAIL;
1000                                 else {
1001                                         laddr = ia->ia_addr.sin_addr;
1002                                         error = 0;
1003                                 }
1004                                 IN_IFADDR_RUNLOCK();
1005                         }
1006                 }
1007                 if (error)
1008                         return (error);
1009         }
1010         oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, fport,
1011             laddr, lport, 0, NULL);
1012         if (oinp != NULL) {
1013                 if (oinpp != NULL)
1014                         *oinpp = oinp;
1015                 return (EADDRINUSE);
1016         }
1017         if (lport == 0) {
1018                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
1019                     cred);
1020                 if (error)
1021                         return (error);
1022         }
1023         *laddrp = laddr.s_addr;
1024         *lportp = lport;
1025         *faddrp = faddr.s_addr;
1026         *fportp = fport;
1027         return (0);
1028 }
1029
1030 void
1031 in_pcbdisconnect(struct inpcb *inp)
1032 {
1033
1034         INP_WLOCK_ASSERT(inp);
1035         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
1036
1037         inp->inp_faddr.s_addr = INADDR_ANY;
1038         inp->inp_fport = 0;
1039         in_pcbrehash(inp);
1040 }
1041 #endif
1042
1043 /*
1044  * in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
1045  * For most protocols, this will be invoked immediately prior to calling
1046  * in_pcbfree().  However, with TCP the inpcb may significantly outlive the
1047  * socket, in which case in_pcbfree() is deferred.
1048  */
1049 void
1050 in_pcbdetach(struct inpcb *inp)
1051 {
1052
1053         KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
1054
1055         inp->inp_socket->so_pcb = NULL;
1056         inp->inp_socket = NULL;
1057 }
1058
1059 /*
1060  * in_pcbref() bumps the reference count on an inpcb in order to maintain
1061  * stability of an inpcb pointer despite the inpcb lock being released.  This
1062  * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
1063  * but where the inpcb lock may already held, or when acquiring a reference
1064  * via a pcbgroup.
1065  *
1066  * in_pcbref() should be used only to provide brief memory stability, and
1067  * must always be followed by a call to INP_WLOCK() and in_pcbrele() to
1068  * garbage collect the inpcb if it has been in_pcbfree()'d from another
1069  * context.  Until in_pcbrele() has returned that the inpcb is still valid,
1070  * lock and rele are the *only* safe operations that may be performed on the
1071  * inpcb.
1072  *
1073  * While the inpcb will not be freed, releasing the inpcb lock means that the
1074  * connection's state may change, so the caller should be careful to
1075  * revalidate any cached state on reacquiring the lock.  Drop the reference
1076  * using in_pcbrele().
1077  */
1078 void
1079 in_pcbref(struct inpcb *inp)
1080 {
1081
1082         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1083
1084         refcount_acquire(&inp->inp_refcount);
1085 }
1086
1087 /*
1088  * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
1089  * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
1090  * return a flag indicating whether or not the inpcb remains valid.  If it is
1091  * valid, we return with the inpcb lock held.
1092  *
1093  * Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a
1094  * reference on an inpcb.  Historically more work was done here (actually, in
1095  * in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the
1096  * need for the pcbinfo lock in in_pcbrele().  Deferring the free is entirely
1097  * about memory stability (and continued use of the write lock).
1098  */
1099 int
1100 in_pcbrele_rlocked(struct inpcb *inp)
1101 {
1102         struct inpcbinfo *pcbinfo;
1103
1104         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1105
1106         INP_RLOCK_ASSERT(inp);
1107
1108         if (refcount_release(&inp->inp_refcount) == 0) {
1109                 /*
1110                  * If the inpcb has been freed, let the caller know, even if
1111                  * this isn't the last reference.
1112                  */
1113                 if (inp->inp_flags2 & INP_FREED) {
1114                         INP_RUNLOCK(inp);
1115                         return (1);
1116                 }
1117                 return (0);
1118         }
1119
1120         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1121
1122         INP_RUNLOCK(inp);
1123         pcbinfo = inp->inp_pcbinfo;
1124         uma_zfree(pcbinfo->ipi_zone, inp);
1125         return (1);
1126 }
1127
1128 int
1129 in_pcbrele_wlocked(struct inpcb *inp)
1130 {
1131         struct inpcbinfo *pcbinfo;
1132
1133         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1134
1135         INP_WLOCK_ASSERT(inp);
1136
1137         if (refcount_release(&inp->inp_refcount) == 0)
1138                 return (0);
1139
1140         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1141
1142         INP_WUNLOCK(inp);
1143         pcbinfo = inp->inp_pcbinfo;
1144         uma_zfree(pcbinfo->ipi_zone, inp);
1145         return (1);
1146 }
1147
1148 /*
1149  * Temporary wrapper.
1150  */
1151 int
1152 in_pcbrele(struct inpcb *inp)
1153 {
1154
1155         return (in_pcbrele_wlocked(inp));
1156 }
1157
1158 /*
1159  * Unconditionally schedule an inpcb to be freed by decrementing its
1160  * reference count, which should occur only after the inpcb has been detached
1161  * from its socket.  If another thread holds a temporary reference (acquired
1162  * using in_pcbref()) then the free is deferred until that reference is
1163  * released using in_pcbrele(), but the inpcb is still unlocked.  Almost all
1164  * work, including removal from global lists, is done in this context, where
1165  * the pcbinfo lock is held.
1166  */
1167 void
1168 in_pcbfree(struct inpcb *inp)
1169 {
1170         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1171
1172         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1173
1174         INP_INFO_WLOCK_ASSERT(pcbinfo);
1175         INP_WLOCK_ASSERT(inp);
1176
1177         /* XXXRW: Do as much as possible here. */
1178 #ifdef IPSEC
1179         if (inp->inp_sp != NULL)
1180                 ipsec_delete_pcbpolicy(inp);
1181 #endif /* IPSEC */
1182         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1183         in_pcbremlists(inp);
1184 #ifdef INET6
1185         if (inp->inp_vflag & INP_IPV6PROTO) {
1186                 ip6_freepcbopts(inp->in6p_outputopts);
1187                 if (inp->in6p_moptions != NULL)
1188                         ip6_freemoptions(inp->in6p_moptions);
1189         }
1190 #endif
1191         if (inp->inp_options)
1192                 (void)m_free(inp->inp_options);
1193 #ifdef INET
1194         if (inp->inp_moptions != NULL)
1195                 inp_freemoptions(inp->inp_moptions);
1196 #endif
1197         inp->inp_vflag = 0;
1198         inp->inp_flags2 |= INP_FREED;
1199         crfree(inp->inp_cred);
1200 #ifdef MAC
1201         mac_inpcb_destroy(inp);
1202 #endif
1203         if (!in_pcbrele_wlocked(inp))
1204                 INP_WUNLOCK(inp);
1205 }
1206
1207 /*
1208  * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
1209  * port reservation, and preventing it from being returned by inpcb lookups.
1210  *
1211  * It is used by TCP to mark an inpcb as unused and avoid future packet
1212  * delivery or event notification when a socket remains open but TCP has
1213  * closed.  This might occur as a result of a shutdown()-initiated TCP close
1214  * or a RST on the wire, and allows the port binding to be reused while still
1215  * maintaining the invariant that so_pcb always points to a valid inpcb until
1216  * in_pcbdetach().
1217  *
1218  * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
1219  * in_pcbnotifyall() and in_pcbpurgeif0()?
1220  */
1221 void
1222 in_pcbdrop(struct inpcb *inp)
1223 {
1224
1225         INP_WLOCK_ASSERT(inp);
1226
1227         /*
1228          * XXXRW: Possibly we should protect the setting of INP_DROPPED with
1229          * the hash lock...?
1230          */
1231         inp->inp_flags |= INP_DROPPED;
1232         if (inp->inp_flags & INP_INHASHLIST) {
1233                 struct inpcbport *phd = inp->inp_phd;
1234
1235                 INP_HASH_WLOCK(inp->inp_pcbinfo);
1236                 LIST_REMOVE(inp, inp_hash);
1237                 LIST_REMOVE(inp, inp_portlist);
1238                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1239                         LIST_REMOVE(phd, phd_hash);
1240                         free(phd, M_PCB);
1241                 }
1242                 INP_HASH_WUNLOCK(inp->inp_pcbinfo);
1243                 inp->inp_flags &= ~INP_INHASHLIST;
1244 #ifdef PCBGROUP
1245                 in_pcbgroup_remove(inp);
1246 #endif
1247         }
1248 }
1249
1250 #ifdef INET
1251 /*
1252  * Common routines to return the socket addresses associated with inpcbs.
1253  */
1254 struct sockaddr *
1255 in_sockaddr(in_port_t port, struct in_addr *addr_p)
1256 {
1257         struct sockaddr_in *sin;
1258
1259         sin = malloc(sizeof *sin, M_SONAME,
1260                 M_WAITOK | M_ZERO);
1261         sin->sin_family = AF_INET;
1262         sin->sin_len = sizeof(*sin);
1263         sin->sin_addr = *addr_p;
1264         sin->sin_port = port;
1265
1266         return (struct sockaddr *)sin;
1267 }
1268
1269 int
1270 in_getsockaddr(struct socket *so, struct sockaddr **nam)
1271 {
1272         struct inpcb *inp;
1273         struct in_addr addr;
1274         in_port_t port;
1275
1276         inp = sotoinpcb(so);
1277         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
1278
1279         INP_RLOCK(inp);
1280         port = inp->inp_lport;
1281         addr = inp->inp_laddr;
1282         INP_RUNLOCK(inp);
1283
1284         *nam = in_sockaddr(port, &addr);
1285         return 0;
1286 }
1287
1288 int
1289 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
1290 {
1291         struct inpcb *inp;
1292         struct in_addr addr;
1293         in_port_t port;
1294
1295         inp = sotoinpcb(so);
1296         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
1297
1298         INP_RLOCK(inp);
1299         port = inp->inp_fport;
1300         addr = inp->inp_faddr;
1301         INP_RUNLOCK(inp);
1302
1303         *nam = in_sockaddr(port, &addr);
1304         return 0;
1305 }
1306
1307 void
1308 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
1309     struct inpcb *(*notify)(struct inpcb *, int))
1310 {
1311         struct inpcb *inp, *inp_temp;
1312
1313         INP_INFO_WLOCK(pcbinfo);
1314         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
1315                 INP_WLOCK(inp);
1316 #ifdef INET6
1317                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1318                         INP_WUNLOCK(inp);
1319                         continue;
1320                 }
1321 #endif
1322                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1323                     inp->inp_socket == NULL) {
1324                         INP_WUNLOCK(inp);
1325                         continue;
1326                 }
1327                 if ((*notify)(inp, errno))
1328                         INP_WUNLOCK(inp);
1329         }
1330         INP_INFO_WUNLOCK(pcbinfo);
1331 }
1332
1333 void
1334 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
1335 {
1336         struct inpcb *inp;
1337         struct ip_moptions *imo;
1338         int i, gap;
1339
1340         INP_INFO_RLOCK(pcbinfo);
1341         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
1342                 INP_WLOCK(inp);
1343                 imo = inp->inp_moptions;
1344                 if ((inp->inp_vflag & INP_IPV4) &&
1345                     imo != NULL) {
1346                         /*
1347                          * Unselect the outgoing interface if it is being
1348                          * detached.
1349                          */
1350                         if (imo->imo_multicast_ifp == ifp)
1351                                 imo->imo_multicast_ifp = NULL;
1352
1353                         /*
1354                          * Drop multicast group membership if we joined
1355                          * through the interface being detached.
1356                          */
1357                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1358                             i++) {
1359                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1360                                         in_delmulti(imo->imo_membership[i]);
1361                                         gap++;
1362                                 } else if (gap != 0)
1363                                         imo->imo_membership[i - gap] =
1364                                             imo->imo_membership[i];
1365                         }
1366                         imo->imo_num_memberships -= gap;
1367                 }
1368                 INP_WUNLOCK(inp);
1369         }
1370         INP_INFO_RUNLOCK(pcbinfo);
1371 }
1372
1373 /*
1374  * Lookup a PCB based on the local address and port.  Caller must hold the
1375  * hash lock.  No inpcb locks or references are acquired.
1376  */
1377 #define INP_LOOKUP_MAPPED_PCB_COST      3
1378 struct inpcb *
1379 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
1380     u_short lport, int lookupflags, struct ucred *cred)
1381 {
1382         struct inpcb *inp;
1383 #ifdef INET6
1384         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
1385 #else
1386         int matchwild = 3;
1387 #endif
1388         int wildcard;
1389
1390         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1391             ("%s: invalid lookup flags %d", __func__, lookupflags));
1392
1393         INP_HASH_LOCK_ASSERT(pcbinfo);
1394
1395         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
1396                 struct inpcbhead *head;
1397                 /*
1398                  * Look for an unconnected (wildcard foreign addr) PCB that
1399                  * matches the local address and port we're looking for.
1400                  */
1401                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1402                     0, pcbinfo->ipi_hashmask)];
1403                 LIST_FOREACH(inp, head, inp_hash) {
1404 #ifdef INET6
1405                         /* XXX inp locking */
1406                         if ((inp->inp_vflag & INP_IPV4) == 0)
1407                                 continue;
1408 #endif
1409                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1410                             inp->inp_laddr.s_addr == laddr.s_addr &&
1411                             inp->inp_lport == lport) {
1412                                 /*
1413                                  * Found?
1414                                  */
1415                                 if (cred == NULL ||
1416                                     prison_equal_ip4(cred->cr_prison,
1417                                         inp->inp_cred->cr_prison))
1418                                         return (inp);
1419                         }
1420                 }
1421                 /*
1422                  * Not found.
1423                  */
1424                 return (NULL);
1425         } else {
1426                 struct inpcbporthead *porthash;
1427                 struct inpcbport *phd;
1428                 struct inpcb *match = NULL;
1429                 /*
1430                  * Best fit PCB lookup.
1431                  *
1432                  * First see if this local port is in use by looking on the
1433                  * port hash list.
1434                  */
1435                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
1436                     pcbinfo->ipi_porthashmask)];
1437                 LIST_FOREACH(phd, porthash, phd_hash) {
1438                         if (phd->phd_port == lport)
1439                                 break;
1440                 }
1441                 if (phd != NULL) {
1442                         /*
1443                          * Port is in use by one or more PCBs. Look for best
1444                          * fit.
1445                          */
1446                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1447                                 wildcard = 0;
1448                                 if (cred != NULL &&
1449                                     !prison_equal_ip4(inp->inp_cred->cr_prison,
1450                                         cred->cr_prison))
1451                                         continue;
1452 #ifdef INET6
1453                                 /* XXX inp locking */
1454                                 if ((inp->inp_vflag & INP_IPV4) == 0)
1455                                         continue;
1456                                 /*
1457                                  * We never select the PCB that has
1458                                  * INP_IPV6 flag and is bound to :: if
1459                                  * we have another PCB which is bound
1460                                  * to 0.0.0.0.  If a PCB has the
1461                                  * INP_IPV6 flag, then we set its cost
1462                                  * higher than IPv4 only PCBs.
1463                                  *
1464                                  * Note that the case only happens
1465                                  * when a socket is bound to ::, under
1466                                  * the condition that the use of the
1467                                  * mapped address is allowed.
1468                                  */
1469                                 if ((inp->inp_vflag & INP_IPV6) != 0)
1470                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
1471 #endif
1472                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
1473                                         wildcard++;
1474                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
1475                                         if (laddr.s_addr == INADDR_ANY)
1476                                                 wildcard++;
1477                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
1478                                                 continue;
1479                                 } else {
1480                                         if (laddr.s_addr != INADDR_ANY)
1481                                                 wildcard++;
1482                                 }
1483                                 if (wildcard < matchwild) {
1484                                         match = inp;
1485                                         matchwild = wildcard;
1486                                         if (matchwild == 0)
1487                                                 break;
1488                                 }
1489                         }
1490                 }
1491                 return (match);
1492         }
1493 }
1494 #undef INP_LOOKUP_MAPPED_PCB_COST
1495
1496 #ifdef PCBGROUP
1497 /*
1498  * Lookup PCB in hash list, using pcbgroup tables.
1499  */
1500 static struct inpcb *
1501 in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
1502     struct in_addr faddr, u_int fport_arg, struct in_addr laddr,
1503     u_int lport_arg, int lookupflags, struct ifnet *ifp)
1504 {
1505         struct inpcbhead *head;
1506         struct inpcb *inp, *tmpinp;
1507         u_short fport = fport_arg, lport = lport_arg;
1508
1509         /*
1510          * First look for an exact match.
1511          */
1512         tmpinp = NULL;
1513         INP_GROUP_LOCK(pcbgroup);
1514         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1515             pcbgroup->ipg_hashmask)];
1516         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
1517 #ifdef INET6
1518                 /* XXX inp locking */
1519                 if ((inp->inp_vflag & INP_IPV4) == 0)
1520                         continue;
1521 #endif
1522                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1523                     inp->inp_laddr.s_addr == laddr.s_addr &&
1524                     inp->inp_fport == fport &&
1525                     inp->inp_lport == lport) {
1526                         /*
1527                          * XXX We should be able to directly return
1528                          * the inp here, without any checks.
1529                          * Well unless both bound with SO_REUSEPORT?
1530                          */
1531                         if (prison_flag(inp->inp_cred, PR_IP4))
1532                                 goto found;
1533                         if (tmpinp == NULL)
1534                                 tmpinp = inp;
1535                 }
1536         }
1537         if (tmpinp != NULL) {
1538                 inp = tmpinp;
1539                 goto found;
1540         }
1541
1542         /*
1543          * Then look for a wildcard match, if requested.
1544          */
1545         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1546                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1547 #ifdef INET6
1548                 struct inpcb *local_wild_mapped = NULL;
1549 #endif
1550                 struct inpcb *jail_wild = NULL;
1551                 struct inpcbhead *head;
1552                 int injail;
1553
1554                 /*
1555                  * Order of socket selection - we always prefer jails.
1556                  *      1. jailed, non-wild.
1557                  *      2. jailed, wild.
1558                  *      3. non-jailed, non-wild.
1559                  *      4. non-jailed, wild.
1560                  */
1561                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
1562                     0, pcbinfo->ipi_wildmask)];
1563                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
1564 #ifdef INET6
1565                         /* XXX inp locking */
1566                         if ((inp->inp_vflag & INP_IPV4) == 0)
1567                                 continue;
1568 #endif
1569                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1570                             inp->inp_lport != lport)
1571                                 continue;
1572
1573                         /* XXX inp locking */
1574                         if (ifp && ifp->if_type == IFT_FAITH &&
1575                             (inp->inp_flags & INP_FAITH) == 0)
1576                                 continue;
1577
1578                         injail = prison_flag(inp->inp_cred, PR_IP4);
1579                         if (injail) {
1580                                 if (prison_check_ip4(inp->inp_cred,
1581                                     &laddr) != 0)
1582                                         continue;
1583                         } else {
1584                                 if (local_exact != NULL)
1585                                         continue;
1586                         }
1587
1588                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1589                                 if (injail)
1590                                         goto found;
1591                                 else
1592                                         local_exact = inp;
1593                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1594 #ifdef INET6
1595                                 /* XXX inp locking, NULL check */
1596                                 if (inp->inp_vflag & INP_IPV6PROTO)
1597                                         local_wild_mapped = inp;
1598                                 else
1599 #endif /* INET6 */
1600                                         if (injail)
1601                                                 jail_wild = inp;
1602                                         else
1603                                                 local_wild = inp;
1604                         }
1605                 } /* LIST_FOREACH */
1606                 inp = jail_wild;
1607                 if (inp == NULL)
1608                         inp = local_exact;
1609                 if (inp == NULL)
1610                         inp = local_wild;
1611 #ifdef INET6
1612                 if (inp == NULL)
1613                         inp = local_wild_mapped;
1614 #endif /* defined(INET6) */
1615                 if (inp != NULL)
1616                         goto found;
1617         } /* if (lookupflags & INPLOOKUP_WILDCARD) */
1618         INP_GROUP_UNLOCK(pcbgroup);
1619         return (NULL);
1620
1621 found:
1622         in_pcbref(inp);
1623         INP_GROUP_UNLOCK(pcbgroup);
1624         if (lookupflags & INPLOOKUP_WLOCKPCB) {
1625                 INP_WLOCK(inp);
1626                 if (in_pcbrele_wlocked(inp))
1627                         return (NULL);
1628         } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1629                 INP_RLOCK(inp);
1630                 if (in_pcbrele_rlocked(inp))
1631                         return (NULL);
1632         } else
1633                 panic("%s: locking bug", __func__);
1634         return (inp);
1635 }
1636 #endif /* PCBGROUP */
1637
1638 /*
1639  * Lookup PCB in hash list, using pcbinfo tables.  This variation assumes
1640  * that the caller has locked the hash list, and will not perform any further
1641  * locking or reference operations on either the hash list or the connection.
1642  */
1643 static struct inpcb *
1644 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1645     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags,
1646     struct ifnet *ifp)
1647 {
1648         struct inpcbhead *head;
1649         struct inpcb *inp, *tmpinp;
1650         u_short fport = fport_arg, lport = lport_arg;
1651
1652         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1653             ("%s: invalid lookup flags %d", __func__, lookupflags));
1654
1655         INP_HASH_LOCK_ASSERT(pcbinfo);
1656
1657         /*
1658          * First look for an exact match.
1659          */
1660         tmpinp = NULL;
1661         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1662             pcbinfo->ipi_hashmask)];
1663         LIST_FOREACH(inp, head, inp_hash) {
1664 #ifdef INET6
1665                 /* XXX inp locking */
1666                 if ((inp->inp_vflag & INP_IPV4) == 0)
1667                         continue;
1668 #endif
1669                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1670                     inp->inp_laddr.s_addr == laddr.s_addr &&
1671                     inp->inp_fport == fport &&
1672                     inp->inp_lport == lport) {
1673                         /*
1674                          * XXX We should be able to directly return
1675                          * the inp here, without any checks.
1676                          * Well unless both bound with SO_REUSEPORT?
1677                          */
1678                         if (prison_flag(inp->inp_cred, PR_IP4))
1679                                 return (inp);
1680                         if (tmpinp == NULL)
1681                                 tmpinp = inp;
1682                 }
1683         }
1684         if (tmpinp != NULL)
1685                 return (tmpinp);
1686
1687         /*
1688          * Then look for a wildcard match, if requested.
1689          */
1690         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1691                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1692 #ifdef INET6
1693                 struct inpcb *local_wild_mapped = NULL;
1694 #endif
1695                 struct inpcb *jail_wild = NULL;
1696                 int injail;
1697
1698                 /*
1699                  * Order of socket selection - we always prefer jails.
1700                  *      1. jailed, non-wild.
1701                  *      2. jailed, wild.
1702                  *      3. non-jailed, non-wild.
1703                  *      4. non-jailed, wild.
1704                  */
1705
1706                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1707                     0, pcbinfo->ipi_hashmask)];
1708                 LIST_FOREACH(inp, head, inp_hash) {
1709 #ifdef INET6
1710                         /* XXX inp locking */
1711                         if ((inp->inp_vflag & INP_IPV4) == 0)
1712                                 continue;
1713 #endif
1714                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1715                             inp->inp_lport != lport)
1716                                 continue;
1717
1718                         /* XXX inp locking */
1719                         if (ifp && ifp->if_type == IFT_FAITH &&
1720                             (inp->inp_flags & INP_FAITH) == 0)
1721                                 continue;
1722
1723                         injail = prison_flag(inp->inp_cred, PR_IP4);
1724                         if (injail) {
1725                                 if (prison_check_ip4(inp->inp_cred,
1726                                     &laddr) != 0)
1727                                         continue;
1728                         } else {
1729                                 if (local_exact != NULL)
1730                                         continue;
1731                         }
1732
1733                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1734                                 if (injail)
1735                                         return (inp);
1736                                 else
1737                                         local_exact = inp;
1738                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1739 #ifdef INET6
1740                                 /* XXX inp locking, NULL check */
1741                                 if (inp->inp_vflag & INP_IPV6PROTO)
1742                                         local_wild_mapped = inp;
1743                                 else
1744 #endif /* INET6 */
1745                                         if (injail)
1746                                                 jail_wild = inp;
1747                                         else
1748                                                 local_wild = inp;
1749                         }
1750                 } /* LIST_FOREACH */
1751                 if (jail_wild != NULL)
1752                         return (jail_wild);
1753                 if (local_exact != NULL)
1754                         return (local_exact);
1755                 if (local_wild != NULL)
1756                         return (local_wild);
1757 #ifdef INET6
1758                 if (local_wild_mapped != NULL)
1759                         return (local_wild_mapped);
1760 #endif /* defined(INET6) */
1761         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1762
1763         return (NULL);
1764 }
1765
1766 /*
1767  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1768  * hash list lock, and will return the inpcb locked (i.e., requires
1769  * INPLOOKUP_LOCKPCB).
1770  */
1771 static struct inpcb *
1772 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1773     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1774     struct ifnet *ifp)
1775 {
1776         struct inpcb *inp;
1777
1778         INP_HASH_RLOCK(pcbinfo);
1779         inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1780             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1781         if (inp != NULL) {
1782                 in_pcbref(inp);
1783                 INP_HASH_RUNLOCK(pcbinfo);
1784                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1785                         INP_WLOCK(inp);
1786                         if (in_pcbrele_wlocked(inp))
1787                                 return (NULL);
1788                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1789                         INP_RLOCK(inp);
1790                         if (in_pcbrele_rlocked(inp))
1791                                 return (NULL);
1792                 } else
1793                         panic("%s: locking bug", __func__);
1794         } else
1795                 INP_HASH_RUNLOCK(pcbinfo);
1796         return (inp);
1797 }
1798
1799 /*
1800  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1801  * from which a pre-calculated hash value may be extracted.
1802  *
1803  * Possibly more of this logic should be in in_pcbgroup.c.
1804  */
1805 struct inpcb *
1806 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport,
1807     struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1808 {
1809 #if defined(PCBGROUP)
1810         struct inpcbgroup *pcbgroup;
1811 #endif
1812
1813         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1814             ("%s: invalid lookup flags %d", __func__, lookupflags));
1815         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1816             ("%s: LOCKPCB not set", __func__));
1817
1818 #if defined(PCBGROUP)
1819         if (in_pcbgroup_enabled(pcbinfo)) {
1820                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1821                     fport);
1822                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1823                     laddr, lport, lookupflags, ifp));
1824         }
1825 #endif
1826         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1827             lookupflags, ifp));
1828 }
1829
1830 struct inpcb *
1831 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1832     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1833     struct ifnet *ifp, struct mbuf *m)
1834 {
1835 #ifdef PCBGROUP
1836         struct inpcbgroup *pcbgroup;
1837 #endif
1838
1839         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1840             ("%s: invalid lookup flags %d", __func__, lookupflags));
1841         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1842             ("%s: LOCKPCB not set", __func__));
1843
1844 #ifdef PCBGROUP
1845         if (in_pcbgroup_enabled(pcbinfo)) {
1846                 pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1847                     m->m_pkthdr.flowid);
1848                 if (pcbgroup != NULL)
1849                         return (in_pcblookup_group(pcbinfo, pcbgroup, faddr,
1850                             fport, laddr, lport, lookupflags, ifp));
1851                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1852                     fport);
1853                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1854                     laddr, lport, lookupflags, ifp));
1855         }
1856 #endif
1857         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1858             lookupflags, ifp));
1859 }
1860 #endif /* INET */
1861
1862 /*
1863  * Insert PCB onto various hash lists.
1864  */
1865 static int
1866 in_pcbinshash_internal(struct inpcb *inp, int do_pcbgroup_update)
1867 {
1868         struct inpcbhead *pcbhash;
1869         struct inpcbporthead *pcbporthash;
1870         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1871         struct inpcbport *phd;
1872         u_int32_t hashkey_faddr;
1873
1874         INP_WLOCK_ASSERT(inp);
1875         INP_HASH_WLOCK_ASSERT(pcbinfo);
1876
1877         KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
1878             ("in_pcbinshash: INP_INHASHLIST"));
1879
1880 #ifdef INET6
1881         if (inp->inp_vflag & INP_IPV6)
1882                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1883         else
1884 #endif /* INET6 */
1885         hashkey_faddr = inp->inp_faddr.s_addr;
1886
1887         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1888                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1889
1890         pcbporthash = &pcbinfo->ipi_porthashbase[
1891             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
1892
1893         /*
1894          * Go through port list and look for a head for this lport.
1895          */
1896         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1897                 if (phd->phd_port == inp->inp_lport)
1898                         break;
1899         }
1900         /*
1901          * If none exists, malloc one and tack it on.
1902          */
1903         if (phd == NULL) {
1904                 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1905                 if (phd == NULL) {
1906                         return (ENOBUFS); /* XXX */
1907                 }
1908                 phd->phd_port = inp->inp_lport;
1909                 LIST_INIT(&phd->phd_pcblist);
1910                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1911         }
1912         inp->inp_phd = phd;
1913         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1914         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1915         inp->inp_flags |= INP_INHASHLIST;
1916 #ifdef PCBGROUP
1917         if (do_pcbgroup_update)
1918                 in_pcbgroup_update(inp);
1919 #endif
1920         return (0);
1921 }
1922
1923 /*
1924  * For now, there are two public interfaces to insert an inpcb into the hash
1925  * lists -- one that does update pcbgroups, and one that doesn't.  The latter
1926  * is used only in the TCP syncache, where in_pcbinshash is called before the
1927  * full 4-tuple is set for the inpcb, and we don't want to install in the
1928  * pcbgroup until later.
1929  *
1930  * XXXRW: This seems like a misfeature.  in_pcbinshash should always update
1931  * connection groups, and partially initialised inpcbs should not be exposed
1932  * to either reservation hash tables or pcbgroups.
1933  */
1934 int
1935 in_pcbinshash(struct inpcb *inp)
1936 {
1937
1938         return (in_pcbinshash_internal(inp, 1));
1939 }
1940
1941 int
1942 in_pcbinshash_nopcbgroup(struct inpcb *inp)
1943 {
1944
1945         return (in_pcbinshash_internal(inp, 0));
1946 }
1947
1948 /*
1949  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1950  * changed. NOTE: This does not handle the case of the lport changing (the
1951  * hashed port list would have to be updated as well), so the lport must
1952  * not change after in_pcbinshash() has been called.
1953  */
1954 void
1955 in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m)
1956 {
1957         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1958         struct inpcbhead *head;
1959         u_int32_t hashkey_faddr;
1960
1961         INP_WLOCK_ASSERT(inp);
1962         INP_HASH_WLOCK_ASSERT(pcbinfo);
1963
1964         KASSERT(inp->inp_flags & INP_INHASHLIST,
1965             ("in_pcbrehash: !INP_INHASHLIST"));
1966
1967 #ifdef INET6
1968         if (inp->inp_vflag & INP_IPV6)
1969                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1970         else
1971 #endif /* INET6 */
1972         hashkey_faddr = inp->inp_faddr.s_addr;
1973
1974         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1975                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1976
1977         LIST_REMOVE(inp, inp_hash);
1978         LIST_INSERT_HEAD(head, inp, inp_hash);
1979
1980 #ifdef PCBGROUP
1981         if (m != NULL)
1982                 in_pcbgroup_update_mbuf(inp, m);
1983         else
1984                 in_pcbgroup_update(inp);
1985 #endif
1986 }
1987
1988 void
1989 in_pcbrehash(struct inpcb *inp)
1990 {
1991
1992         in_pcbrehash_mbuf(inp, NULL);
1993 }
1994
1995 /*
1996  * Remove PCB from various lists.
1997  */
1998 static void
1999 in_pcbremlists(struct inpcb *inp)
2000 {
2001         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
2002
2003         INP_INFO_WLOCK_ASSERT(pcbinfo);
2004         INP_WLOCK_ASSERT(inp);
2005
2006         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
2007         if (inp->inp_flags & INP_INHASHLIST) {
2008                 struct inpcbport *phd = inp->inp_phd;
2009
2010                 INP_HASH_WLOCK(pcbinfo);
2011                 LIST_REMOVE(inp, inp_hash);
2012                 LIST_REMOVE(inp, inp_portlist);
2013                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
2014                         LIST_REMOVE(phd, phd_hash);
2015                         free(phd, M_PCB);
2016                 }
2017                 INP_HASH_WUNLOCK(pcbinfo);
2018                 inp->inp_flags &= ~INP_INHASHLIST;
2019         }
2020         LIST_REMOVE(inp, inp_list);
2021         pcbinfo->ipi_count--;
2022 #ifdef PCBGROUP
2023         in_pcbgroup_remove(inp);
2024 #endif
2025 }
2026
2027 /*
2028  * A set label operation has occurred at the socket layer, propagate the
2029  * label change into the in_pcb for the socket.
2030  */
2031 void
2032 in_pcbsosetlabel(struct socket *so)
2033 {
2034 #ifdef MAC
2035         struct inpcb *inp;
2036
2037         inp = sotoinpcb(so);
2038         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
2039
2040         INP_WLOCK(inp);
2041         SOCK_LOCK(so);
2042         mac_inpcb_sosetlabel(so, inp);
2043         SOCK_UNLOCK(so);
2044         INP_WUNLOCK(inp);
2045 #endif
2046 }
2047
2048 /*
2049  * ipport_tick runs once per second, determining if random port allocation
2050  * should be continued.  If more than ipport_randomcps ports have been
2051  * allocated in the last second, then we return to sequential port
2052  * allocation. We return to random allocation only once we drop below
2053  * ipport_randomcps for at least ipport_randomtime seconds.
2054  */
2055 static void
2056 ipport_tick(void *xtp)
2057 {
2058         VNET_ITERATOR_DECL(vnet_iter);
2059
2060         VNET_LIST_RLOCK_NOSLEEP();
2061         VNET_FOREACH(vnet_iter) {
2062                 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
2063                 if (V_ipport_tcpallocs <=
2064                     V_ipport_tcplastcount + V_ipport_randomcps) {
2065                         if (V_ipport_stoprandom > 0)
2066                                 V_ipport_stoprandom--;
2067                 } else
2068                         V_ipport_stoprandom = V_ipport_randomtime;
2069                 V_ipport_tcplastcount = V_ipport_tcpallocs;
2070                 CURVNET_RESTORE();
2071         }
2072         VNET_LIST_RUNLOCK_NOSLEEP();
2073         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
2074 }
2075
2076 static void
2077 ip_fini(void *xtp)
2078 {
2079
2080         callout_stop(&ipport_tick_callout);
2081 }
2082
2083 /*
2084  * The ipport_callout should start running at about the time we attach the
2085  * inet or inet6 domains.
2086  */
2087 static void
2088 ipport_tick_init(const void *unused __unused)
2089 {
2090
2091         /* Start ipport_tick. */
2092         callout_init(&ipport_tick_callout, CALLOUT_MPSAFE);
2093         callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL);
2094         EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL,
2095                 SHUTDOWN_PRI_DEFAULT);
2096 }
2097 SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
2098     ipport_tick_init, NULL);
2099
2100 void
2101 inp_wlock(struct inpcb *inp)
2102 {
2103
2104         INP_WLOCK(inp);
2105 }
2106
2107 void
2108 inp_wunlock(struct inpcb *inp)
2109 {
2110
2111         INP_WUNLOCK(inp);
2112 }
2113
2114 void
2115 inp_rlock(struct inpcb *inp)
2116 {
2117
2118         INP_RLOCK(inp);
2119 }
2120
2121 void
2122 inp_runlock(struct inpcb *inp)
2123 {
2124
2125         INP_RUNLOCK(inp);
2126 }
2127
2128 #ifdef INVARIANTS
2129 void
2130 inp_lock_assert(struct inpcb *inp)
2131 {
2132
2133         INP_WLOCK_ASSERT(inp);
2134 }
2135
2136 void
2137 inp_unlock_assert(struct inpcb *inp)
2138 {
2139
2140         INP_UNLOCK_ASSERT(inp);
2141 }
2142 #endif
2143
2144 void
2145 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
2146 {
2147         struct inpcb *inp;
2148
2149         INP_INFO_RLOCK(&V_tcbinfo);
2150         LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
2151                 INP_WLOCK(inp);
2152                 func(inp, arg);
2153                 INP_WUNLOCK(inp);
2154         }
2155         INP_INFO_RUNLOCK(&V_tcbinfo);
2156 }
2157
2158 struct socket *
2159 inp_inpcbtosocket(struct inpcb *inp)
2160 {
2161
2162         INP_WLOCK_ASSERT(inp);
2163         return (inp->inp_socket);
2164 }
2165
2166 struct tcpcb *
2167 inp_inpcbtotcpcb(struct inpcb *inp)
2168 {
2169
2170         INP_WLOCK_ASSERT(inp);
2171         return ((struct tcpcb *)inp->inp_ppcb);
2172 }
2173
2174 int
2175 inp_ip_tos_get(const struct inpcb *inp)
2176 {
2177
2178         return (inp->inp_ip_tos);
2179 }
2180
2181 void
2182 inp_ip_tos_set(struct inpcb *inp, int val)
2183 {
2184
2185         inp->inp_ip_tos = val;
2186 }
2187
2188 void
2189 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
2190     uint32_t *faddr, uint16_t *fp)
2191 {
2192
2193         INP_LOCK_ASSERT(inp);
2194         *laddr = inp->inp_laddr.s_addr;
2195         *faddr = inp->inp_faddr.s_addr;
2196         *lp = inp->inp_lport;
2197         *fp = inp->inp_fport;
2198 }
2199
2200 struct inpcb *
2201 so_sotoinpcb(struct socket *so)
2202 {
2203
2204         return (sotoinpcb(so));
2205 }
2206
2207 struct tcpcb *
2208 so_sototcpcb(struct socket *so)
2209 {
2210
2211         return (sototcpcb(so));
2212 }
2213
2214 #ifdef DDB
2215 static void
2216 db_print_indent(int indent)
2217 {
2218         int i;
2219
2220         for (i = 0; i < indent; i++)
2221                 db_printf(" ");
2222 }
2223
2224 static void
2225 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
2226 {
2227         char faddr_str[48], laddr_str[48];
2228
2229         db_print_indent(indent);
2230         db_printf("%s at %p\n", name, inc);
2231
2232         indent += 2;
2233
2234 #ifdef INET6
2235         if (inc->inc_flags & INC_ISIPV6) {
2236                 /* IPv6. */
2237                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
2238                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
2239         } else {
2240 #endif
2241                 /* IPv4. */
2242                 inet_ntoa_r(inc->inc_laddr, laddr_str);
2243                 inet_ntoa_r(inc->inc_faddr, faddr_str);
2244 #ifdef INET6
2245         }
2246 #endif
2247         db_print_indent(indent);
2248         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
2249             ntohs(inc->inc_lport));
2250         db_print_indent(indent);
2251         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
2252             ntohs(inc->inc_fport));
2253 }
2254
2255 static void
2256 db_print_inpflags(int inp_flags)
2257 {
2258         int comma;
2259
2260         comma = 0;
2261         if (inp_flags & INP_RECVOPTS) {
2262                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
2263                 comma = 1;
2264         }
2265         if (inp_flags & INP_RECVRETOPTS) {
2266                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
2267                 comma = 1;
2268         }
2269         if (inp_flags & INP_RECVDSTADDR) {
2270                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
2271                 comma = 1;
2272         }
2273         if (inp_flags & INP_HDRINCL) {
2274                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
2275                 comma = 1;
2276         }
2277         if (inp_flags & INP_HIGHPORT) {
2278                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
2279                 comma = 1;
2280         }
2281         if (inp_flags & INP_LOWPORT) {
2282                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
2283                 comma = 1;
2284         }
2285         if (inp_flags & INP_ANONPORT) {
2286                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
2287                 comma = 1;
2288         }
2289         if (inp_flags & INP_RECVIF) {
2290                 db_printf("%sINP_RECVIF", comma ? ", " : "");
2291                 comma = 1;
2292         }
2293         if (inp_flags & INP_MTUDISC) {
2294                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
2295                 comma = 1;
2296         }
2297         if (inp_flags & INP_FAITH) {
2298                 db_printf("%sINP_FAITH", comma ? ", " : "");
2299                 comma = 1;
2300         }
2301         if (inp_flags & INP_RECVTTL) {
2302                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
2303                 comma = 1;
2304         }
2305         if (inp_flags & INP_DONTFRAG) {
2306                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
2307                 comma = 1;
2308         }
2309         if (inp_flags & INP_RECVTOS) {
2310                 db_printf("%sINP_RECVTOS", comma ? ", " : "");
2311                 comma = 1;
2312         }
2313         if (inp_flags & IN6P_IPV6_V6ONLY) {
2314                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
2315                 comma = 1;
2316         }
2317         if (inp_flags & IN6P_PKTINFO) {
2318                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
2319                 comma = 1;
2320         }
2321         if (inp_flags & IN6P_HOPLIMIT) {
2322                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
2323                 comma = 1;
2324         }
2325         if (inp_flags & IN6P_HOPOPTS) {
2326                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
2327                 comma = 1;
2328         }
2329         if (inp_flags & IN6P_DSTOPTS) {
2330                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
2331                 comma = 1;
2332         }
2333         if (inp_flags & IN6P_RTHDR) {
2334                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
2335                 comma = 1;
2336         }
2337         if (inp_flags & IN6P_RTHDRDSTOPTS) {
2338                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
2339                 comma = 1;
2340         }
2341         if (inp_flags & IN6P_TCLASS) {
2342                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
2343                 comma = 1;
2344         }
2345         if (inp_flags & IN6P_AUTOFLOWLABEL) {
2346                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
2347                 comma = 1;
2348         }
2349         if (inp_flags & INP_TIMEWAIT) {
2350                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
2351                 comma  = 1;
2352         }
2353         if (inp_flags & INP_ONESBCAST) {
2354                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
2355                 comma  = 1;
2356         }
2357         if (inp_flags & INP_DROPPED) {
2358                 db_printf("%sINP_DROPPED", comma ? ", " : "");
2359                 comma  = 1;
2360         }
2361         if (inp_flags & INP_SOCKREF) {
2362                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
2363                 comma  = 1;
2364         }
2365         if (inp_flags & IN6P_RFC2292) {
2366                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
2367                 comma = 1;
2368         }
2369         if (inp_flags & IN6P_MTU) {
2370                 db_printf("IN6P_MTU%s", comma ? ", " : "");
2371                 comma = 1;
2372         }
2373 }
2374
2375 static void
2376 db_print_inpvflag(u_char inp_vflag)
2377 {
2378         int comma;
2379
2380         comma = 0;
2381         if (inp_vflag & INP_IPV4) {
2382                 db_printf("%sINP_IPV4", comma ? ", " : "");
2383                 comma  = 1;
2384         }
2385         if (inp_vflag & INP_IPV6) {
2386                 db_printf("%sINP_IPV6", comma ? ", " : "");
2387                 comma  = 1;
2388         }
2389         if (inp_vflag & INP_IPV6PROTO) {
2390                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
2391                 comma  = 1;
2392         }
2393 }
2394
2395 static void
2396 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
2397 {
2398
2399         db_print_indent(indent);
2400         db_printf("%s at %p\n", name, inp);
2401
2402         indent += 2;
2403
2404         db_print_indent(indent);
2405         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
2406
2407         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
2408
2409         db_print_indent(indent);
2410         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
2411             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
2412
2413         db_print_indent(indent);
2414         db_printf("inp_label: %p   inp_flags: 0x%x (",
2415            inp->inp_label, inp->inp_flags);
2416         db_print_inpflags(inp->inp_flags);
2417         db_printf(")\n");
2418
2419         db_print_indent(indent);
2420         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
2421             inp->inp_vflag);
2422         db_print_inpvflag(inp->inp_vflag);
2423         db_printf(")\n");
2424
2425         db_print_indent(indent);
2426         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
2427             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
2428
2429         db_print_indent(indent);
2430 #ifdef INET6
2431         if (inp->inp_vflag & INP_IPV6) {
2432                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
2433                     "in6p_moptions: %p\n", inp->in6p_options,
2434                     inp->in6p_outputopts, inp->in6p_moptions);
2435                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
2436                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
2437                     inp->in6p_hops);
2438         } else
2439 #endif
2440         {
2441                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
2442                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
2443                     inp->inp_options, inp->inp_moptions);
2444         }
2445
2446         db_print_indent(indent);
2447         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
2448             (uintmax_t)inp->inp_gencnt);
2449 }
2450
2451 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
2452 {
2453         struct inpcb *inp;
2454
2455         if (!have_addr) {
2456                 db_printf("usage: show inpcb <addr>\n");
2457                 return;
2458         }
2459         inp = (struct inpcb *)addr;
2460
2461         db_print_inpcb(inp, "inpcb", 0);
2462 }
2463 #endif