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 /* INET */
 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         uma_zone_set_warning(pcbinfo->ipi_zone,
 240             "kern.ipc.maxsockets limit reached");
 241 }
 242
 243 /*
 244  * Destroy an inpcbinfo.
 245  */
 246 void
 247 in_pcbinfo_destroy(struct inpcbinfo *pcbinfo)
 248 {
 249
 250         KASSERT(pcbinfo->ipi_count == 0,
 251             ("%s: ipi_count = %u", __func__, pcbinfo->ipi_count));
 252
 253         hashdestroy(pcbinfo->ipi_hashbase, M_PCB, pcbinfo->ipi_hashmask);
 254         hashdestroy(pcbinfo->ipi_porthashbase, M_PCB,
 255             pcbinfo->ipi_porthashmask);
 256 #ifdef PCBGROUP
 257         in_pcbgroup_destroy(pcbinfo);
 258 #endif
 259         uma_zdestroy(pcbinfo->ipi_zone);
 260         INP_HASH_LOCK_DESTROY(pcbinfo);
 261         INP_INFO_LOCK_DESTROY(pcbinfo);
 262 }
 263
 264 /*
 265  * Allocate a PCB and associate it with the socket.
 266  * On success return with the PCB locked.
 267  */
 268 int
 269 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 270 {
 271         struct inpcb *inp;
 272         int error;
 273
 274         INP_INFO_WLOCK_ASSERT(pcbinfo);
 275         error = 0;
 276         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
 277         if (inp == NULL)
 278                 return (ENOBUFS);
 279         bzero(inp, inp_zero_size);
 280         inp->inp_pcbinfo = pcbinfo;
 281         inp->inp_socket = so;
 282         inp->inp_cred = crhold(so->so_cred);
 283         inp->inp_inc.inc_fibnum = so->so_fibnum;
 284 #ifdef MAC
 285         error = mac_inpcb_init(inp, M_NOWAIT);
 286         if (error != 0)
 287                 goto out;
 288         mac_inpcb_create(so, inp);
 289 #endif
 290 #ifdef IPSEC
 291         error = ipsec_init_policy(so, &inp->inp_sp);
 292         if (error != 0) {
 293 #ifdef MAC
 294                 mac_inpcb_destroy(inp);
 295 #endif
 296                 goto out;
 297         }
 298 #endif /*IPSEC*/
 299 #ifdef INET6
 300         if (INP_SOCKAF(so) == AF_INET6) {
 301                 inp->inp_vflag |= INP_IPV6PROTO;
 302                 if (V_ip6_v6only)
 303                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 304         }
 305 #endif
 306         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
 307         pcbinfo->ipi_count++;
 308         so->so_pcb = (caddr_t)inp;
 309 #ifdef INET6
 310         if (V_ip6_auto_flowlabel)
 311                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 312 #endif
 313         INP_WLOCK(inp);
 314         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 315         refcount_init(&inp->inp_refcount, 1);   /* Reference from inpcbinfo */
 316 #if defined(IPSEC) || defined(MAC)
 317 out:
 318         if (error != 0) {
 319                 crfree(inp->inp_cred);
 320                 uma_zfree(pcbinfo->ipi_zone, inp);
 321         }
 322 #endif
 323         return (error);
 324 }
 325
 326 #ifdef INET
 327 int
 328 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 329 {
 330         int anonport, error;
 331
 332         INP_WLOCK_ASSERT(inp);
 333         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 334
 335         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 336                 return (EINVAL);
 337         anonport = nam == NULL || ((struct sockaddr_in *)nam)->sin_port == 0;
 338         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 339             &inp->inp_lport, cred);
 340         if (error)
 341                 return (error);
 342         if (in_pcbinshash(inp) != 0) {
 343                 inp->inp_laddr.s_addr = INADDR_ANY;
 344                 inp->inp_lport = 0;
 345                 return (EAGAIN);
 346         }
 347         if (anonport)
 348                 inp->inp_flags |= INP_ANONPORT;
 349         return (0);
 350 }
 351 #endif
 352
 353 #if defined(INET) || defined(INET6)
 354 int
 355 in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp,
 356     struct ucred *cred, int lookupflags)
 357 {
 358         struct inpcbinfo *pcbinfo;
 359         struct inpcb *tmpinp;
 360         unsigned short *lastport;
 361         int count, dorandom, error;
 362         u_short aux, first, last, lport;
 363 #ifdef INET
 364         struct in_addr laddr;
 365 #endif
 366
 367         pcbinfo = inp->inp_pcbinfo;
 368
 369         /*
 370          * Because no actual state changes occur here, a global write lock on
 371          * the pcbinfo isn't required.
 372          */
 373         INP_LOCK_ASSERT(inp);
 374         INP_HASH_LOCK_ASSERT(pcbinfo);
 375
 376         if (inp->inp_flags & INP_HIGHPORT) {
 377                 first = V_ipport_hifirstauto;   /* sysctl */
 378                 last  = V_ipport_hilastauto;
 379                 lastport = &pcbinfo->ipi_lasthi;
 380         } else if (inp->inp_flags & INP_LOWPORT) {
 381                 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
 382                 if (error)
 383                         return (error);
 384                 first = V_ipport_lowfirstauto;  /* 1023 */
 385                 last  = V_ipport_lowlastauto;   /* 600 */
 386                 lastport = &pcbinfo->ipi_lastlow;
 387         } else {
 388                 first = V_ipport_firstauto;     /* sysctl */
 389                 last  = V_ipport_lastauto;
 390                 lastport = &pcbinfo->ipi_lastport;
 391         }
 392         /*
 393          * For UDP, use random port allocation as long as the user
 394          * allows it.  For TCP (and as of yet unknown) connections,
 395          * use random port allocation only if the user allows it AND
 396          * ipport_tick() allows it.
 397          */
 398         if (V_ipport_randomized &&
 399                 (!V_ipport_stoprandom || pcbinfo == &V_udbinfo))
 400                 dorandom = 1;
 401         else
 402                 dorandom = 0;
 403         /*
 404          * It makes no sense to do random port allocation if
 405          * we have the only port available.
 406          */
 407         if (first == last)
 408                 dorandom = 0;
 409         /* Make sure to not include UDP packets in the count. */
 410         if (pcbinfo != &V_udbinfo)
 411                 V_ipport_tcpallocs++;
 412         /*
 413          * Instead of having two loops further down counting up or down
 414          * make sure that first is always <= last and go with only one
 415          * code path implementing all logic.
 416          */
 417         if (first > last) {
 418                 aux = first;
 419                 first = last;
 420                 last = aux;
 421         }
 422
 423 #ifdef INET
 424         /* Make the compiler happy. */
 425         laddr.s_addr = 0;
 426         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) {
 427                 KASSERT(laddrp != NULL, ("%s: laddrp NULL for v4 inp %p",
 428                     __func__, inp));
 429                 laddr = *laddrp;
 430         }
 431 #endif
 432         tmpinp = NULL;  /* Make compiler happy. */
 433         lport = *lportp;
 434
 435         if (dorandom)
 436                 *lastport = first + (arc4random() % (last - first));
 437
 438         count = last - first;
 439
 440         do {
 441                 if (count-- < 0)        /* completely used? */
 442                         return (EADDRNOTAVAIL);
 443                 ++*lastport;
 444                 if (*lastport < first || *lastport > last)
 445                         *lastport = first;
 446                 lport = htons(*lastport);
 447
 448 #ifdef INET6
 449                 if ((inp->inp_vflag & INP_IPV6) != 0)
 450                         tmpinp = in6_pcblookup_local(pcbinfo,
 451                             &inp->in6p_laddr, lport, lookupflags, cred);
 452 #endif
 453 #if defined(INET) && defined(INET6)
 454                 else
 455 #endif
 456 #ifdef INET
 457                         tmpinp = in_pcblookup_local(pcbinfo, laddr,
 458                             lport, lookupflags, cred);
 459 #endif
 460         } while (tmpinp != NULL);
 461
 462 #ifdef INET
 463         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4)
 464                 laddrp->s_addr = laddr.s_addr;
 465 #endif
 466         *lportp = lport;
 467
 468         return (0);
 469 }
 470 #endif /* INET || INET6 */
 471
 472 #ifdef INET
 473 /*
 474  * Set up a bind operation on a PCB, performing port allocation
 475  * as required, but do not actually modify the PCB. Callers can
 476  * either complete the bind by setting inp_laddr/inp_lport and
 477  * calling in_pcbinshash(), or they can just use the resulting
 478  * port and address to authorise the sending of a once-off packet.
 479  *
 480  * On error, the values of *laddrp and *lportp are not changed.
 481  */
 482 int
 483 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 484     u_short *lportp, struct ucred *cred)
 485 {
 486         struct socket *so = inp->inp_socket;
 487         struct sockaddr_in *sin;
 488         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 489         struct in_addr laddr;
 490         u_short lport = 0;
 491         int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT);
 492         int error;
 493
 494         /*
 495          * No state changes, so read locks are sufficient here.
 496          */
 497         INP_LOCK_ASSERT(inp);
 498         INP_HASH_LOCK_ASSERT(pcbinfo);
 499
 500         if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
 501                 return (EADDRNOTAVAIL);
 502         laddr.s_addr = *laddrp;
 503         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 504                 return (EINVAL);
 505         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 506                 lookupflags = INPLOOKUP_WILDCARD;
 507         if (nam == NULL) {
 508                 if ((error = prison_local_ip4(cred, &laddr)) != 0)
 509                         return (error);
 510         } else {
 511                 sin = (struct sockaddr_in *)nam;
 512                 if (nam->sa_len != sizeof (*sin))
 513                         return (EINVAL);
 514 #ifdef notdef
 515                 /*
 516                  * We should check the family, but old programs
 517                  * incorrectly fail to initialize it.
 518                  */
 519                 if (sin->sin_family != AF_INET)
 520                         return (EAFNOSUPPORT);
 521 #endif
 522                 error = prison_local_ip4(cred, &sin->sin_addr);
 523                 if (error)
 524                         return (error);
 525                 if (sin->sin_port != *lportp) {
 526                         /* Don't allow the port to change. */
 527                         if (*lportp != 0)
 528                                 return (EINVAL);
 529                         lport = sin->sin_port;
 530                 }
 531                 /* NB: lport is left as 0 if the port isn't being changed. */
 532                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 533                         /*
 534                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 535                          * allow complete duplication of binding if
 536                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 537                          * and a multicast address is bound on both
 538                          * new and duplicated sockets.
 539                          */
 540                         if (so->so_options & SO_REUSEADDR)
 541                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 542                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 543                         sin->sin_port = 0;              /* yech... */
 544                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 545                         /*
 546                          * Is the address a local IP address?
 547                          * If INP_BINDANY is set, then the socket may be bound
 548                          * to any endpoint address, local or not.
 549                          */
 550                         if ((inp->inp_flags & INP_BINDANY) == 0 &&
 551                             ifa_ifwithaddr_check((struct sockaddr *)sin) == 0)
 552                                 return (EADDRNOTAVAIL);
 553                 }
 554                 laddr = sin->sin_addr;
 555                 if (lport) {
 556                         struct inpcb *t;
 557                         struct tcptw *tw;
 558
 559                         /* GROSS */
 560                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 561                             ntohs(lport) >= V_ipport_reservedlow &&
 562                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 563                             0))
 564                                 return (EACCES);
 565                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 566                             priv_check_cred(inp->inp_cred,
 567                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 568                                 t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 569                                     lport, INPLOOKUP_WILDCARD, cred);
 570         /*
 571          * XXX
 572          * This entire block sorely needs a rewrite.
 573          */
 574                                 if (t &&
 575                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 576                                     (so->so_type != SOCK_STREAM ||
 577                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
 578                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
 579                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 580                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
 581                                     (inp->inp_cred->cr_uid !=
 582                                      t->inp_cred->cr_uid))
 583                                         return (EADDRINUSE);
 584                         }
 585                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 586                             lport, lookupflags, cred);
 587                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 588                                 /*
 589                                  * XXXRW: If an incpb has had its timewait
 590                                  * state recycled, we treat the address as
 591                                  * being in use (for now).  This is better
 592                                  * than a panic, but not desirable.
 593                                  */
 594                                 tw = intotw(t);
 595                                 if (tw == NULL ||
 596                                     (reuseport & tw->tw_so_options) == 0)
 597                                         return (EADDRINUSE);
 598                         } else if (t && (reuseport == 0 ||
 599                             (t->inp_flags2 & INP_REUSEPORT) == 0)) {
 600 #ifdef INET6
 601                                 if (ntohl(sin->sin_addr.s_addr) !=
 602                                     INADDR_ANY ||
 603                                     ntohl(t->inp_laddr.s_addr) !=
 604                                     INADDR_ANY ||
 605                                     (inp->inp_vflag & INP_IPV6PROTO) == 0 ||
 606                                     (t->inp_vflag & INP_IPV6PROTO) == 0)
 607 #endif
 608                                 return (EADDRINUSE);
 609                         }
 610                 }
 611         }
 612         if (*lportp != 0)
 613                 lport = *lportp;
 614         if (lport == 0) {
 615                 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags);
 616                 if (error != 0)
 617                         return (error);
 618
 619         }
 620         *laddrp = laddr.s_addr;
 621         *lportp = lport;
 622         return (0);
 623 }
 624
 625 /*
 626  * Connect from a socket to a specified address.
 627  * Both address and port must be specified in argument sin.
 628  * If don't have a local address for this socket yet,
 629  * then pick one.
 630  */
 631 int
 632 in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
 633     struct ucred *cred, struct mbuf *m)
 634 {
 635         u_short lport, fport;
 636         in_addr_t laddr, faddr;
 637         int anonport, error;
 638
 639         INP_WLOCK_ASSERT(inp);
 640         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 641
 642         lport = inp->inp_lport;
 643         laddr = inp->inp_laddr.s_addr;
 644         anonport = (lport == 0);
 645         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 646             NULL, cred);
 647         if (error)
 648                 return (error);
 649
 650         /* Do the initial binding of the local address if required. */
 651         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 652                 inp->inp_lport = lport;
 653                 inp->inp_laddr.s_addr = laddr;
 654                 if (in_pcbinshash(inp) != 0) {
 655                         inp->inp_laddr.s_addr = INADDR_ANY;
 656                         inp->inp_lport = 0;
 657                         return (EAGAIN);
 658                 }
 659         }
 660
 661         /* Commit the remaining changes. */
 662         inp->inp_lport = lport;
 663         inp->inp_laddr.s_addr = laddr;
 664         inp->inp_faddr.s_addr = faddr;
 665         inp->inp_fport = fport;
 666         in_pcbrehash_mbuf(inp, m);
 667
 668         if (anonport)
 669                 inp->inp_flags |= INP_ANONPORT;
 670         return (0);
 671 }
 672
 673 int
 674 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 675 {
 676
 677         return (in_pcbconnect_mbuf(inp, nam, cred, NULL));
 678 }
 679
 680 /*
 681  * Do proper source address selection on an unbound socket in case
 682  * of connect. Take jails into account as well.
 683  */
 684 static int
 685 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
 686     struct ucred *cred)
 687 {
 688         struct ifaddr *ifa;
 689         struct sockaddr *sa;
 690         struct sockaddr_in *sin;
 691         struct route sro;
 692         int error;
 693
 694         KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
 695
 696         /*
 697          * Bypass source address selection and use the primary jail IP
 698          * if requested.
 699          */
 700         if (cred != NULL && !prison_saddrsel_ip4(cred, laddr))
 701                 return (0);
 702
 703         error = 0;
 704         bzero(&sro, sizeof(sro));
 705
 706         sin = (struct sockaddr_in *)&sro.ro_dst;
 707         sin->sin_family = AF_INET;
 708         sin->sin_len = sizeof(struct sockaddr_in);
 709         sin->sin_addr.s_addr = faddr->s_addr;
 710
 711         /*
 712          * If route is known our src addr is taken from the i/f,
 713          * else punt.
 714          *
 715          * Find out route to destination.
 716          */
 717         if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 718                 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
 719
 720         /*
 721          * If we found a route, use the address corresponding to
 722          * the outgoing interface.
 723          *
 724          * Otherwise assume faddr is reachable on a directly connected
 725          * network and try to find a corresponding interface to take
 726          * the source address from.
 727          */
 728         if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
 729                 struct in_ifaddr *ia;
 730                 struct ifnet *ifp;
 731
 732                 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin));
 733                 if (ia == NULL)
 734                         ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0));
 735                 if (ia == NULL) {
 736                         error = ENETUNREACH;
 737                         goto done;
 738                 }
 739
 740                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 741                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 742                         ifa_free(&ia->ia_ifa);
 743                         goto done;
 744                 }
 745
 746                 ifp = ia->ia_ifp;
 747                 ifa_free(&ia->ia_ifa);
 748                 ia = NULL;
 749                 IF_ADDR_RLOCK(ifp);
 750                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 751
 752                         sa = ifa->ifa_addr;
 753                         if (sa->sa_family != AF_INET)
 754                                 continue;
 755                         sin = (struct sockaddr_in *)sa;
 756                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 757                                 ia = (struct in_ifaddr *)ifa;
 758                                 break;
 759                         }
 760                 }
 761                 if (ia != NULL) {
 762                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 763                         IF_ADDR_RUNLOCK(ifp);
 764                         goto done;
 765                 }
 766                 IF_ADDR_RUNLOCK(ifp);
 767
 768                 /* 3. As a last resort return the 'default' jail address. */
 769                 error = prison_get_ip4(cred, laddr);
 770                 goto done;
 771         }
 772
 773         /*
 774          * If the outgoing interface on the route found is not
 775          * a loopback interface, use the address from that interface.
 776          * In case of jails do those three steps:
 777          * 1. check if the interface address belongs to the jail. If so use it.
 778          * 2. check if we have any address on the outgoing interface
 779          *    belonging to this jail. If so use it.
 780          * 3. as a last resort return the 'default' jail address.
 781          */
 782         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
 783                 struct in_ifaddr *ia;
 784                 struct ifnet *ifp;
 785
 786                 /* If not jailed, use the default returned. */
 787                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 788                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 789                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 790                         goto done;
 791                 }
 792
 793                 /* Jailed. */
 794                 /* 1. Check if the iface address belongs to the jail. */
 795                 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
 796                 if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 797                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 798                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 799                         goto done;
 800                 }
 801
 802                 /*
 803                  * 2. Check if we have any address on the outgoing interface
 804                  *    belonging to this jail.
 805                  */
 806                 ia = NULL;
 807                 ifp = sro.ro_rt->rt_ifp;
 808                 IF_ADDR_RLOCK(ifp);
 809                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 810                         sa = ifa->ifa_addr;
 811                         if (sa->sa_family != AF_INET)
 812                                 continue;
 813                         sin = (struct sockaddr_in *)sa;
 814                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 815                                 ia = (struct in_ifaddr *)ifa;
 816                                 break;
 817                         }
 818                 }
 819                 if (ia != NULL) {
 820                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 821                         IF_ADDR_RUNLOCK(ifp);
 822                         goto done;
 823                 }
 824                 IF_ADDR_RUNLOCK(ifp);
 825
 826                 /* 3. As a last resort return the 'default' jail address. */
 827                 error = prison_get_ip4(cred, laddr);
 828                 goto done;
 829         }
 830
 831         /*
 832          * The outgoing interface is marked with 'loopback net', so a route
 833          * to ourselves is here.
 834          * Try to find the interface of the destination address and then
 835          * take the address from there. That interface is not necessarily
 836          * a loopback interface.
 837          * In case of jails, check that it is an address of the jail
 838          * and if we cannot find, fall back to the 'default' jail address.
 839          */
 840         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
 841                 struct sockaddr_in sain;
 842                 struct in_ifaddr *ia;
 843
 844                 bzero(&sain, sizeof(struct sockaddr_in));
 845                 sain.sin_family = AF_INET;
 846                 sain.sin_len = sizeof(struct sockaddr_in);
 847                 sain.sin_addr.s_addr = faddr->s_addr;
 848
 849                 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain)));
 850                 if (ia == NULL)
 851                         ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0));
 852                 if (ia == NULL)
 853                         ia = ifatoia(ifa_ifwithaddr(sintosa(&sain)));
 854
 855                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 856                         if (ia == NULL) {
 857                                 error = ENETUNREACH;
 858                                 goto done;
 859                         }
 860                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 861                         ifa_free(&ia->ia_ifa);
 862                         goto done;
 863                 }
 864
 865                 /* Jailed. */
 866                 if (ia != NULL) {
 867                         struct ifnet *ifp;
 868
 869                         ifp = ia->ia_ifp;
 870                         ifa_free(&ia->ia_ifa);
 871                         ia = NULL;
 872                         IF_ADDR_RLOCK(ifp);
 873                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 874
 875                                 sa = ifa->ifa_addr;
 876                                 if (sa->sa_family != AF_INET)
 877                                         continue;
 878                                 sin = (struct sockaddr_in *)sa;
 879                                 if (prison_check_ip4(cred,
 880                                     &sin->sin_addr) == 0) {
 881                                         ia = (struct in_ifaddr *)ifa;
 882                                         break;
 883                                 }
 884                         }
 885                         if (ia != NULL) {
 886                                 laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 887                                 IF_ADDR_RUNLOCK(ifp);
 888                                 goto done;
 889                         }
 890                         IF_ADDR_RUNLOCK(ifp);
 891                 }
 892
 893                 /* 3. As a last resort return the 'default' jail address. */
 894                 error = prison_get_ip4(cred, laddr);
 895                 goto done;
 896         }
 897
 898 done:
 899         if (sro.ro_rt != NULL)
 900                 RTFREE(sro.ro_rt);
 901         return (error);
 902 }
 903
 904 /*
 905  * Set up for a connect from a socket to the specified address.
 906  * On entry, *laddrp and *lportp should contain the current local
 907  * address and port for the PCB; these are updated to the values
 908  * that should be placed in inp_laddr and inp_lport to complete
 909  * the connect.
 910  *
 911  * On success, *faddrp and *fportp will be set to the remote address
 912  * and port. These are not updated in the error case.
 913  *
 914  * If the operation fails because the connection already exists,
 915  * *oinpp will be set to the PCB of that connection so that the
 916  * caller can decide to override it. In all other cases, *oinpp
 917  * is set to NULL.
 918  */
 919 int
 920 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 921     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 922     struct inpcb **oinpp, struct ucred *cred)
 923 {
 924         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 925         struct in_ifaddr *ia;
 926         struct inpcb *oinp;
 927         struct in_addr laddr, faddr;
 928         u_short lport, fport;
 929         int error;
 930
 931         /*
 932          * Because a global state change doesn't actually occur here, a read
 933          * lock is sufficient.
 934          */
 935         INP_LOCK_ASSERT(inp);
 936         INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo);
 937
 938         if (oinpp != NULL)
 939                 *oinpp = NULL;
 940         if (nam->sa_len != sizeof (*sin))
 941                 return (EINVAL);
 942         if (sin->sin_family != AF_INET)
 943                 return (EAFNOSUPPORT);
 944         if (sin->sin_port == 0)
 945                 return (EADDRNOTAVAIL);
 946         laddr.s_addr = *laddrp;
 947         lport = *lportp;
 948         faddr = sin->sin_addr;
 949         fport = sin->sin_port;
 950
 951         if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
 952                 /*
 953                  * If the destination address is INADDR_ANY,
 954                  * use the primary local address.
 955                  * If the supplied address is INADDR_BROADCAST,
 956                  * and the primary interface supports broadcast,
 957                  * choose the broadcast address for that interface.
 958                  */
 959                 if (faddr.s_addr == INADDR_ANY) {
 960                         IN_IFADDR_RLOCK();
 961                         faddr =
 962                             IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
 963                         IN_IFADDR_RUNLOCK();
 964                         if (cred != NULL &&
 965                             (error = prison_get_ip4(cred, &faddr)) != 0)
 966                                 return (error);
 967                 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
 968                         IN_IFADDR_RLOCK();
 969                         if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
 970                             IFF_BROADCAST)
 971                                 faddr = satosin(&TAILQ_FIRST(
 972                                     &V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
 973                         IN_IFADDR_RUNLOCK();
 974                 }
 975         }
 976         if (laddr.s_addr == INADDR_ANY) {
 977                 error = in_pcbladdr(inp, &faddr, &laddr, cred);
 978                 /*
 979                  * If the destination address is multicast and an outgoing
 980                  * interface has been set as a multicast option, prefer the
 981                  * address of that interface as our source address.
 982                  */
 983                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
 984                     inp->inp_moptions != NULL) {
 985                         struct ip_moptions *imo;
 986                         struct ifnet *ifp;
 987
 988                         imo = inp->inp_moptions;
 989                         if (imo->imo_multicast_ifp != NULL) {
 990                                 ifp = imo->imo_multicast_ifp;
 991                                 IN_IFADDR_RLOCK();
 992                                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
 993                                         if ((ia->ia_ifp == ifp) &&
 994                                             (cred == NULL ||
 995                                             prison_check_ip4(cred,
 996                                             &ia->ia_addr.sin_addr) == 0))
 997                                                 break;
 998                                 }
 999                                 if (ia == NULL)
1000                                         error = EADDRNOTAVAIL;
1001                                 else {
1002                                         laddr = ia->ia_addr.sin_addr;
1003                                         error = 0;
1004                                 }
1005                                 IN_IFADDR_RUNLOCK();
1006                         }
1007                 }
1008                 if (error)
1009                         return (error);
1010         }
1011         oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, fport,
1012             laddr, lport, 0, NULL);
1013         if (oinp != NULL) {
1014                 if (oinpp != NULL)
1015                         *oinpp = oinp;
1016                 return (EADDRINUSE);
1017         }
1018         if (lport == 0) {
1019                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
1020                     cred);
1021                 if (error)
1022                         return (error);
1023         }
1024         *laddrp = laddr.s_addr;
1025         *lportp = lport;
1026         *faddrp = faddr.s_addr;
1027         *fportp = fport;
1028         return (0);
1029 }
1030
1031 void
1032 in_pcbdisconnect(struct inpcb *inp)
1033 {
1034
1035         INP_WLOCK_ASSERT(inp);
1036         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
1037
1038         inp->inp_faddr.s_addr = INADDR_ANY;
1039         inp->inp_fport = 0;
1040         in_pcbrehash(inp);
1041 }
1042 #endif /* INET */
1043
1044 /*
1045  * in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
1046  * For most protocols, this will be invoked immediately prior to calling
1047  * in_pcbfree().  However, with TCP the inpcb may significantly outlive the
1048  * socket, in which case in_pcbfree() is deferred.
1049  */
1050 void
1051 in_pcbdetach(struct inpcb *inp)
1052 {
1053
1054         KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
1055
1056         inp->inp_socket->so_pcb = NULL;
1057         inp->inp_socket = NULL;
1058 }
1059
1060 /*
1061  * in_pcbref() bumps the reference count on an inpcb in order to maintain
1062  * stability of an inpcb pointer despite the inpcb lock being released.  This
1063  * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
1064  * but where the inpcb lock may already held, or when acquiring a reference
1065  * via a pcbgroup.
1066  *
1067  * in_pcbref() should be used only to provide brief memory stability, and
1068  * must always be followed by a call to INP_WLOCK() and in_pcbrele() to
1069  * garbage collect the inpcb if it has been in_pcbfree()'d from another
1070  * context.  Until in_pcbrele() has returned that the inpcb is still valid,
1071  * lock and rele are the *only* safe operations that may be performed on the
1072  * inpcb.
1073  *
1074  * While the inpcb will not be freed, releasing the inpcb lock means that the
1075  * connection's state may change, so the caller should be careful to
1076  * revalidate any cached state on reacquiring the lock.  Drop the reference
1077  * using in_pcbrele().
1078  */
1079 void
1080 in_pcbref(struct inpcb *inp)
1081 {
1082
1083         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1084
1085         refcount_acquire(&inp->inp_refcount);
1086 }
1087
1088 /*
1089  * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
1090  * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
1091  * return a flag indicating whether or not the inpcb remains valid.  If it is
1092  * valid, we return with the inpcb lock held.
1093  *
1094  * Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a
1095  * reference on an inpcb.  Historically more work was done here (actually, in
1096  * in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the
1097  * need for the pcbinfo lock in in_pcbrele().  Deferring the free is entirely
1098  * about memory stability (and continued use of the write lock).
1099  */
1100 int
1101 in_pcbrele_rlocked(struct inpcb *inp)
1102 {
1103         struct inpcbinfo *pcbinfo;
1104
1105         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1106
1107         INP_RLOCK_ASSERT(inp);
1108
1109         if (refcount_release(&inp->inp_refcount) == 0) {
1110                 /*
1111                  * If the inpcb has been freed, let the caller know, even if
1112                  * this isn't the last reference.
1113                  */
1114                 if (inp->inp_flags2 & INP_FREED) {
1115                         INP_RUNLOCK(inp);
1116                         return (1);
1117                 }
1118                 return (0);
1119         }
1120
1121         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1122
1123         INP_RUNLOCK(inp);
1124         pcbinfo = inp->inp_pcbinfo;
1125         uma_zfree(pcbinfo->ipi_zone, inp);
1126         return (1);
1127 }
1128
1129 int
1130 in_pcbrele_wlocked(struct inpcb *inp)
1131 {
1132         struct inpcbinfo *pcbinfo;
1133
1134         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1135
1136         INP_WLOCK_ASSERT(inp);
1137
1138         if (refcount_release(&inp->inp_refcount) == 0)
1139                 return (0);
1140
1141         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1142
1143         INP_WUNLOCK(inp);
1144         pcbinfo = inp->inp_pcbinfo;
1145         uma_zfree(pcbinfo->ipi_zone, inp);
1146         return (1);
1147 }
1148
1149 /*
1150  * Temporary wrapper.
1151  */
1152 int
1153 in_pcbrele(struct inpcb *inp)
1154 {
1155
1156         return (in_pcbrele_wlocked(inp));
1157 }
1158
1159 /*
1160  * Unconditionally schedule an inpcb to be freed by decrementing its
1161  * reference count, which should occur only after the inpcb has been detached
1162  * from its socket.  If another thread holds a temporary reference (acquired
1163  * using in_pcbref()) then the free is deferred until that reference is
1164  * released using in_pcbrele(), but the inpcb is still unlocked.  Almost all
1165  * work, including removal from global lists, is done in this context, where
1166  * the pcbinfo lock is held.
1167  */
1168 void
1169 in_pcbfree(struct inpcb *inp)
1170 {
1171         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1172
1173         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1174
1175         INP_INFO_WLOCK_ASSERT(pcbinfo);
1176         INP_WLOCK_ASSERT(inp);
1177
1178         /* XXXRW: Do as much as possible here. */
1179 #ifdef IPSEC
1180         if (inp->inp_sp != NULL)
1181                 ipsec_delete_pcbpolicy(inp);
1182 #endif
1183         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1184         in_pcbremlists(inp);
1185 #ifdef INET6
1186         if (inp->inp_vflag & INP_IPV6PROTO) {
1187                 ip6_freepcbopts(inp->in6p_outputopts);
1188                 if (inp->in6p_moptions != NULL)
1189                         ip6_freemoptions(inp->in6p_moptions);
1190         }
1191 #endif
1192         if (inp->inp_options)
1193                 (void)m_free(inp->inp_options);
1194 #ifdef INET
1195         if (inp->inp_moptions != NULL)
1196                 inp_freemoptions(inp->inp_moptions);
1197 #endif
1198         inp->inp_vflag = 0;
1199         inp->inp_flags2 |= INP_FREED;
1200         crfree(inp->inp_cred);
1201 #ifdef MAC
1202         mac_inpcb_destroy(inp);
1203 #endif
1204         if (!in_pcbrele_wlocked(inp))
1205                 INP_WUNLOCK(inp);
1206 }
1207
1208 /*
1209  * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
1210  * port reservation, and preventing it from being returned by inpcb lookups.
1211  *
1212  * It is used by TCP to mark an inpcb as unused and avoid future packet
1213  * delivery or event notification when a socket remains open but TCP has
1214  * closed.  This might occur as a result of a shutdown()-initiated TCP close
1215  * or a RST on the wire, and allows the port binding to be reused while still
1216  * maintaining the invariant that so_pcb always points to a valid inpcb until
1217  * in_pcbdetach().
1218  *
1219  * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
1220  * in_pcbnotifyall() and in_pcbpurgeif0()?
1221  */
1222 void
1223 in_pcbdrop(struct inpcb *inp)
1224 {
1225
1226         INP_WLOCK_ASSERT(inp);
1227
1228         /*
1229          * XXXRW: Possibly we should protect the setting of INP_DROPPED with
1230          * the hash lock...?
1231          */
1232         inp->inp_flags |= INP_DROPPED;
1233         if (inp->inp_flags & INP_INHASHLIST) {
1234                 struct inpcbport *phd = inp->inp_phd;
1235
1236                 INP_HASH_WLOCK(inp->inp_pcbinfo);
1237                 LIST_REMOVE(inp, inp_hash);
1238                 LIST_REMOVE(inp, inp_portlist);
1239                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1240                         LIST_REMOVE(phd, phd_hash);
1241                         free(phd, M_PCB);
1242                 }
1243                 INP_HASH_WUNLOCK(inp->inp_pcbinfo);
1244                 inp->inp_flags &= ~INP_INHASHLIST;
1245 #ifdef PCBGROUP
1246                 in_pcbgroup_remove(inp);
1247 #endif
1248         }
1249 }
1250
1251 #ifdef INET
1252 /*
1253  * Common routines to return the socket addresses associated with inpcbs.
1254  */
1255 struct sockaddr *
1256 in_sockaddr(in_port_t port, struct in_addr *addr_p)
1257 {
1258         struct sockaddr_in *sin;
1259
1260         sin = malloc(sizeof *sin, M_SONAME,
1261                 M_WAITOK | M_ZERO);
1262         sin->sin_family = AF_INET;
1263         sin->sin_len = sizeof(*sin);
1264         sin->sin_addr = *addr_p;
1265         sin->sin_port = port;
1266
1267         return (struct sockaddr *)sin;
1268 }
1269
1270 int
1271 in_getsockaddr(struct socket *so, struct sockaddr **nam)
1272 {
1273         struct inpcb *inp;
1274         struct in_addr addr;
1275         in_port_t port;
1276
1277         inp = sotoinpcb(so);
1278         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
1279
1280         INP_RLOCK(inp);
1281         port = inp->inp_lport;
1282         addr = inp->inp_laddr;
1283         INP_RUNLOCK(inp);
1284
1285         *nam = in_sockaddr(port, &addr);
1286         return 0;
1287 }
1288
1289 int
1290 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
1291 {
1292         struct inpcb *inp;
1293         struct in_addr addr;
1294         in_port_t port;
1295
1296         inp = sotoinpcb(so);
1297         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
1298
1299         INP_RLOCK(inp);
1300         port = inp->inp_fport;
1301         addr = inp->inp_faddr;
1302         INP_RUNLOCK(inp);
1303
1304         *nam = in_sockaddr(port, &addr);
1305         return 0;
1306 }
1307
1308 void
1309 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
1310     struct inpcb *(*notify)(struct inpcb *, int))
1311 {
1312         struct inpcb *inp, *inp_temp;
1313
1314         INP_INFO_WLOCK(pcbinfo);
1315         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
1316                 INP_WLOCK(inp);
1317 #ifdef INET6
1318                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1319                         INP_WUNLOCK(inp);
1320                         continue;
1321                 }
1322 #endif
1323                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1324                     inp->inp_socket == NULL) {
1325                         INP_WUNLOCK(inp);
1326                         continue;
1327                 }
1328                 if ((*notify)(inp, errno))
1329                         INP_WUNLOCK(inp);
1330         }
1331         INP_INFO_WUNLOCK(pcbinfo);
1332 }
1333
1334 void
1335 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
1336 {
1337         struct inpcb *inp;
1338         struct ip_moptions *imo;
1339         int i, gap;
1340
1341         INP_INFO_RLOCK(pcbinfo);
1342         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
1343                 INP_WLOCK(inp);
1344                 imo = inp->inp_moptions;
1345                 if ((inp->inp_vflag & INP_IPV4) &&
1346                     imo != NULL) {
1347                         /*
1348                          * Unselect the outgoing interface if it is being
1349                          * detached.
1350                          */
1351                         if (imo->imo_multicast_ifp == ifp)
1352                                 imo->imo_multicast_ifp = NULL;
1353
1354                         /*
1355                          * Drop multicast group membership if we joined
1356                          * through the interface being detached.
1357                          */
1358                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1359                             i++) {
1360                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1361                                         in_delmulti(imo->imo_membership[i]);
1362                                         gap++;
1363                                 } else if (gap != 0)
1364                                         imo->imo_membership[i - gap] =
1365                                             imo->imo_membership[i];
1366                         }
1367                         imo->imo_num_memberships -= gap;
1368                 }
1369                 INP_WUNLOCK(inp);
1370         }
1371         INP_INFO_RUNLOCK(pcbinfo);
1372 }
1373
1374 /*
1375  * Lookup a PCB based on the local address and port.  Caller must hold the
1376  * hash lock.  No inpcb locks or references are acquired.
1377  */
1378 #define INP_LOOKUP_MAPPED_PCB_COST      3
1379 struct inpcb *
1380 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
1381     u_short lport, int lookupflags, struct ucred *cred)
1382 {
1383         struct inpcb *inp;
1384 #ifdef INET6
1385         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
1386 #else
1387         int matchwild = 3;
1388 #endif
1389         int wildcard;
1390
1391         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1392             ("%s: invalid lookup flags %d", __func__, lookupflags));
1393
1394         INP_HASH_LOCK_ASSERT(pcbinfo);
1395
1396         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
1397                 struct inpcbhead *head;
1398                 /*
1399                  * Look for an unconnected (wildcard foreign addr) PCB that
1400                  * matches the local address and port we're looking for.
1401                  */
1402                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1403                     0, pcbinfo->ipi_hashmask)];
1404                 LIST_FOREACH(inp, head, inp_hash) {
1405 #ifdef INET6
1406                         /* XXX inp locking */
1407                         if ((inp->inp_vflag & INP_IPV4) == 0)
1408                                 continue;
1409 #endif
1410                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1411                             inp->inp_laddr.s_addr == laddr.s_addr &&
1412                             inp->inp_lport == lport) {
1413                                 /*
1414                                  * Found?
1415                                  */
1416                                 if (cred == NULL ||
1417                                     prison_equal_ip4(cred->cr_prison,
1418                                         inp->inp_cred->cr_prison))
1419                                         return (inp);
1420                         }
1421                 }
1422                 /*
1423                  * Not found.
1424                  */
1425                 return (NULL);
1426         } else {
1427                 struct inpcbporthead *porthash;
1428                 struct inpcbport *phd;
1429                 struct inpcb *match = NULL;
1430                 /*
1431                  * Best fit PCB lookup.
1432                  *
1433                  * First see if this local port is in use by looking on the
1434                  * port hash list.
1435                  */
1436                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
1437                     pcbinfo->ipi_porthashmask)];
1438                 LIST_FOREACH(phd, porthash, phd_hash) {
1439                         if (phd->phd_port == lport)
1440                                 break;
1441                 }
1442                 if (phd != NULL) {
1443                         /*
1444                          * Port is in use by one or more PCBs. Look for best
1445                          * fit.
1446                          */
1447                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1448                                 wildcard = 0;
1449                                 if (cred != NULL &&
1450                                     !prison_equal_ip4(inp->inp_cred->cr_prison,
1451                                         cred->cr_prison))
1452                                         continue;
1453 #ifdef INET6
1454                                 /* XXX inp locking */
1455                                 if ((inp->inp_vflag & INP_IPV4) == 0)
1456                                         continue;
1457                                 /*
1458                                  * We never select the PCB that has
1459                                  * INP_IPV6 flag and is bound to :: if
1460                                  * we have another PCB which is bound
1461                                  * to 0.0.0.0.  If a PCB has the
1462                                  * INP_IPV6 flag, then we set its cost
1463                                  * higher than IPv4 only PCBs.
1464                                  *
1465                                  * Note that the case only happens
1466                                  * when a socket is bound to ::, under
1467                                  * the condition that the use of the
1468                                  * mapped address is allowed.
1469                                  */
1470                                 if ((inp->inp_vflag & INP_IPV6) != 0)
1471                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
1472 #endif
1473                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
1474                                         wildcard++;
1475                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
1476                                         if (laddr.s_addr == INADDR_ANY)
1477                                                 wildcard++;
1478                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
1479                                                 continue;
1480                                 } else {
1481                                         if (laddr.s_addr != INADDR_ANY)
1482                                                 wildcard++;
1483                                 }
1484                                 if (wildcard < matchwild) {
1485                                         match = inp;
1486                                         matchwild = wildcard;
1487                                         if (matchwild == 0)
1488                                                 break;
1489                                 }
1490                         }
1491                 }
1492                 return (match);
1493         }
1494 }
1495 #undef INP_LOOKUP_MAPPED_PCB_COST
1496
1497 #ifdef PCBGROUP
1498 /*
1499  * Lookup PCB in hash list, using pcbgroup tables.
1500  */
1501 static struct inpcb *
1502 in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
1503     struct in_addr faddr, u_int fport_arg, struct in_addr laddr,
1504     u_int lport_arg, int lookupflags, struct ifnet *ifp)
1505 {
1506         struct inpcbhead *head;
1507         struct inpcb *inp, *tmpinp;
1508         u_short fport = fport_arg, lport = lport_arg;
1509
1510         /*
1511          * First look for an exact match.
1512          */
1513         tmpinp = NULL;
1514         INP_GROUP_LOCK(pcbgroup);
1515         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1516             pcbgroup->ipg_hashmask)];
1517         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
1518 #ifdef INET6
1519                 /* XXX inp locking */
1520                 if ((inp->inp_vflag & INP_IPV4) == 0)
1521                         continue;
1522 #endif
1523                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1524                     inp->inp_laddr.s_addr == laddr.s_addr &&
1525                     inp->inp_fport == fport &&
1526                     inp->inp_lport == lport) {
1527                         /*
1528                          * XXX We should be able to directly return
1529                          * the inp here, without any checks.
1530                          * Well unless both bound with SO_REUSEPORT?
1531                          */
1532                         if (prison_flag(inp->inp_cred, PR_IP4))
1533                                 goto found;
1534                         if (tmpinp == NULL)
1535                                 tmpinp = inp;
1536                 }
1537         }
1538         if (tmpinp != NULL) {
1539                 inp = tmpinp;
1540                 goto found;
1541         }
1542
1543         /*
1544          * Then look for a wildcard match, if requested.
1545          */
1546         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1547                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1548 #ifdef INET6
1549                 struct inpcb *local_wild_mapped = NULL;
1550 #endif
1551                 struct inpcb *jail_wild = NULL;
1552                 struct inpcbhead *head;
1553                 int injail;
1554
1555                 /*
1556                  * Order of socket selection - we always prefer jails.
1557                  *      1. jailed, non-wild.
1558                  *      2. jailed, wild.
1559                  *      3. non-jailed, non-wild.
1560                  *      4. non-jailed, wild.
1561                  */
1562                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
1563                     0, pcbinfo->ipi_wildmask)];
1564                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
1565 #ifdef INET6
1566                         /* XXX inp locking */
1567                         if ((inp->inp_vflag & INP_IPV4) == 0)
1568                                 continue;
1569 #endif
1570                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1571                             inp->inp_lport != lport)
1572                                 continue;
1573
1574                         /* XXX inp locking */
1575                         if (ifp && ifp->if_type == IFT_FAITH &&
1576                             (inp->inp_flags & INP_FAITH) == 0)
1577                                 continue;
1578
1579                         injail = prison_flag(inp->inp_cred, PR_IP4);
1580                         if (injail) {
1581                                 if (prison_check_ip4(inp->inp_cred,
1582                                     &laddr) != 0)
1583                                         continue;
1584                         } else {
1585                                 if (local_exact != NULL)
1586                                         continue;
1587                         }
1588
1589                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1590                                 if (injail)
1591                                         goto found;
1592                                 else
1593                                         local_exact = inp;
1594                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1595 #ifdef INET6
1596                                 /* XXX inp locking, NULL check */
1597                                 if (inp->inp_vflag & INP_IPV6PROTO)
1598                                         local_wild_mapped = inp;
1599                                 else
1600 #endif
1601                                         if (injail)
1602                                                 jail_wild = inp;
1603                                         else
1604                                                 local_wild = inp;
1605                         }
1606                 } /* LIST_FOREACH */
1607                 inp = jail_wild;
1608                 if (inp == NULL)
1609                         inp = local_exact;
1610                 if (inp == NULL)
1611                         inp = local_wild;
1612 #ifdef INET6
1613                 if (inp == NULL)
1614                         inp = local_wild_mapped;
1615 #endif
1616                 if (inp != NULL)
1617                         goto found;
1618         } /* if (lookupflags & INPLOOKUP_WILDCARD) */
1619         INP_GROUP_UNLOCK(pcbgroup);
1620         return (NULL);
1621
1622 found:
1623         in_pcbref(inp);
1624         INP_GROUP_UNLOCK(pcbgroup);
1625         if (lookupflags & INPLOOKUP_WLOCKPCB) {
1626                 INP_WLOCK(inp);
1627                 if (in_pcbrele_wlocked(inp))
1628                         return (NULL);
1629         } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1630                 INP_RLOCK(inp);
1631                 if (in_pcbrele_rlocked(inp))
1632                         return (NULL);
1633         } else
1634                 panic("%s: locking bug", __func__);
1635         return (inp);
1636 }
1637 #endif /* PCBGROUP */
1638
1639 /*
1640  * Lookup PCB in hash list, using pcbinfo tables.  This variation assumes
1641  * that the caller has locked the hash list, and will not perform any further
1642  * locking or reference operations on either the hash list or the connection.
1643  */
1644 static struct inpcb *
1645 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1646     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags,
1647     struct ifnet *ifp)
1648 {
1649         struct inpcbhead *head;
1650         struct inpcb *inp, *tmpinp;
1651         u_short fport = fport_arg, lport = lport_arg;
1652
1653         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1654             ("%s: invalid lookup flags %d", __func__, lookupflags));
1655
1656         INP_HASH_LOCK_ASSERT(pcbinfo);
1657
1658         /*
1659          * First look for an exact match.
1660          */
1661         tmpinp = NULL;
1662         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1663             pcbinfo->ipi_hashmask)];
1664         LIST_FOREACH(inp, head, inp_hash) {
1665 #ifdef INET6
1666                 /* XXX inp locking */
1667                 if ((inp->inp_vflag & INP_IPV4) == 0)
1668                         continue;
1669 #endif
1670                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1671                     inp->inp_laddr.s_addr == laddr.s_addr &&
1672                     inp->inp_fport == fport &&
1673                     inp->inp_lport == lport) {
1674                         /*
1675                          * XXX We should be able to directly return
1676                          * the inp here, without any checks.
1677                          * Well unless both bound with SO_REUSEPORT?
1678                          */
1679                         if (prison_flag(inp->inp_cred, PR_IP4))
1680                                 return (inp);
1681                         if (tmpinp == NULL)
1682                                 tmpinp = inp;
1683                 }
1684         }
1685         if (tmpinp != NULL)
1686                 return (tmpinp);
1687
1688         /*
1689          * Then look for a wildcard match, if requested.
1690          */
1691         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1692                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1693 #ifdef INET6
1694                 struct inpcb *local_wild_mapped = NULL;
1695 #endif
1696                 struct inpcb *jail_wild = NULL;
1697                 int injail;
1698
1699                 /*
1700                  * Order of socket selection - we always prefer jails.
1701                  *      1. jailed, non-wild.
1702                  *      2. jailed, wild.
1703                  *      3. non-jailed, non-wild.
1704                  *      4. non-jailed, wild.
1705                  */
1706
1707                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1708                     0, pcbinfo->ipi_hashmask)];
1709                 LIST_FOREACH(inp, head, inp_hash) {
1710 #ifdef INET6
1711                         /* XXX inp locking */
1712                         if ((inp->inp_vflag & INP_IPV4) == 0)
1713                                 continue;
1714 #endif
1715                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1716                             inp->inp_lport != lport)
1717                                 continue;
1718
1719                         /* XXX inp locking */
1720                         if (ifp && ifp->if_type == IFT_FAITH &&
1721                             (inp->inp_flags & INP_FAITH) == 0)
1722                                 continue;
1723
1724                         injail = prison_flag(inp->inp_cred, PR_IP4);
1725                         if (injail) {
1726                                 if (prison_check_ip4(inp->inp_cred,
1727                                     &laddr) != 0)
1728                                         continue;
1729                         } else {
1730                                 if (local_exact != NULL)
1731                                         continue;
1732                         }
1733
1734                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1735                                 if (injail)
1736                                         return (inp);
1737                                 else
1738                                         local_exact = inp;
1739                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1740 #ifdef INET6
1741                                 /* XXX inp locking, NULL check */
1742                                 if (inp->inp_vflag & INP_IPV6PROTO)
1743                                         local_wild_mapped = inp;
1744                                 else
1745 #endif
1746                                         if (injail)
1747                                                 jail_wild = inp;
1748                                         else
1749                                                 local_wild = inp;
1750                         }
1751                 } /* LIST_FOREACH */
1752                 if (jail_wild != NULL)
1753                         return (jail_wild);
1754                 if (local_exact != NULL)
1755                         return (local_exact);
1756                 if (local_wild != NULL)
1757                         return (local_wild);
1758 #ifdef INET6
1759                 if (local_wild_mapped != NULL)
1760                         return (local_wild_mapped);
1761 #endif
1762         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1763
1764         return (NULL);
1765 }
1766
1767 /*
1768  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1769  * hash list lock, and will return the inpcb locked (i.e., requires
1770  * INPLOOKUP_LOCKPCB).
1771  */
1772 static struct inpcb *
1773 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1774     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1775     struct ifnet *ifp)
1776 {
1777         struct inpcb *inp;
1778
1779         INP_HASH_RLOCK(pcbinfo);
1780         inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1781             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1782         if (inp != NULL) {
1783                 in_pcbref(inp);
1784                 INP_HASH_RUNLOCK(pcbinfo);
1785                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1786                         INP_WLOCK(inp);
1787                         if (in_pcbrele_wlocked(inp))
1788                                 return (NULL);
1789                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1790                         INP_RLOCK(inp);
1791                         if (in_pcbrele_rlocked(inp))
1792                                 return (NULL);
1793                 } else
1794                         panic("%s: locking bug", __func__);
1795         } else
1796                 INP_HASH_RUNLOCK(pcbinfo);
1797         return (inp);
1798 }
1799
1800 /*
1801  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1802  * from which a pre-calculated hash value may be extracted.
1803  *
1804  * Possibly more of this logic should be in in_pcbgroup.c.
1805  */
1806 struct inpcb *
1807 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport,
1808     struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1809 {
1810 #if defined(PCBGROUP)
1811         struct inpcbgroup *pcbgroup;
1812 #endif
1813
1814         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1815             ("%s: invalid lookup flags %d", __func__, lookupflags));
1816         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1817             ("%s: LOCKPCB not set", __func__));
1818
1819 #if defined(PCBGROUP)
1820         if (in_pcbgroup_enabled(pcbinfo)) {
1821                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1822                     fport);
1823                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1824                     laddr, lport, lookupflags, ifp));
1825         }
1826 #endif
1827         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1828             lookupflags, ifp));
1829 }
1830
1831 struct inpcb *
1832 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1833     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1834     struct ifnet *ifp, struct mbuf *m)
1835 {
1836 #ifdef PCBGROUP
1837         struct inpcbgroup *pcbgroup;
1838 #endif
1839
1840         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1841             ("%s: invalid lookup flags %d", __func__, lookupflags));
1842         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1843             ("%s: LOCKPCB not set", __func__));
1844
1845 #ifdef PCBGROUP
1846         if (in_pcbgroup_enabled(pcbinfo)) {
1847                 pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1848                     m->m_pkthdr.flowid);
1849                 if (pcbgroup != NULL)
1850                         return (in_pcblookup_group(pcbinfo, pcbgroup, faddr,
1851                             fport, laddr, lport, lookupflags, ifp));
1852                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1853                     fport);
1854                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1855                     laddr, lport, lookupflags, ifp));
1856         }
1857 #endif
1858         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1859             lookupflags, ifp));
1860 }
1861 #endif /* INET */
1862
1863 /*
1864  * Insert PCB onto various hash lists.
1865  */
1866 static int
1867 in_pcbinshash_internal(struct inpcb *inp, int do_pcbgroup_update)
1868 {
1869         struct inpcbhead *pcbhash;
1870         struct inpcbporthead *pcbporthash;
1871         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1872         struct inpcbport *phd;
1873         u_int32_t hashkey_faddr;
1874
1875         INP_WLOCK_ASSERT(inp);
1876         INP_HASH_WLOCK_ASSERT(pcbinfo);
1877
1878         KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
1879             ("in_pcbinshash: INP_INHASHLIST"));
1880
1881 #ifdef INET6
1882         if (inp->inp_vflag & INP_IPV6)
1883                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1884         else
1885 #endif
1886         hashkey_faddr = inp->inp_faddr.s_addr;
1887
1888         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1889                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1890
1891         pcbporthash = &pcbinfo->ipi_porthashbase[
1892             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
1893
1894         /*
1895          * Go through port list and look for a head for this lport.
1896          */
1897         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1898                 if (phd->phd_port == inp->inp_lport)
1899                         break;
1900         }
1901         /*
1902          * If none exists, malloc one and tack it on.
1903          */
1904         if (phd == NULL) {
1905                 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1906                 if (phd == NULL) {
1907                         return (ENOBUFS); /* XXX */
1908                 }
1909                 phd->phd_port = inp->inp_lport;
1910                 LIST_INIT(&phd->phd_pcblist);
1911                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1912         }
1913         inp->inp_phd = phd;
1914         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1915         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1916         inp->inp_flags |= INP_INHASHLIST;
1917 #ifdef PCBGROUP
1918         if (do_pcbgroup_update)
1919                 in_pcbgroup_update(inp);
1920 #endif
1921         return (0);
1922 }
1923
1924 /*
1925  * For now, there are two public interfaces to insert an inpcb into the hash
1926  * lists -- one that does update pcbgroups, and one that doesn't.  The latter
1927  * is used only in the TCP syncache, where in_pcbinshash is called before the
1928  * full 4-tuple is set for the inpcb, and we don't want to install in the
1929  * pcbgroup until later.
1930  *
1931  * XXXRW: This seems like a misfeature.  in_pcbinshash should always update
1932  * connection groups, and partially initialised inpcbs should not be exposed
1933  * to either reservation hash tables or pcbgroups.
1934  */
1935 int
1936 in_pcbinshash(struct inpcb *inp)
1937 {
1938
1939         return (in_pcbinshash_internal(inp, 1));
1940 }
1941
1942 int
1943 in_pcbinshash_nopcbgroup(struct inpcb *inp)
1944 {
1945
1946         return (in_pcbinshash_internal(inp, 0));
1947 }
1948
1949 /*
1950  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1951  * changed. NOTE: This does not handle the case of the lport changing (the
1952  * hashed port list would have to be updated as well), so the lport must
1953  * not change after in_pcbinshash() has been called.
1954  */
1955 void
1956 in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m)
1957 {
1958         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1959         struct inpcbhead *head;
1960         u_int32_t hashkey_faddr;
1961
1962         INP_WLOCK_ASSERT(inp);
1963         INP_HASH_WLOCK_ASSERT(pcbinfo);
1964
1965         KASSERT(inp->inp_flags & INP_INHASHLIST,
1966             ("in_pcbrehash: !INP_INHASHLIST"));
1967
1968 #ifdef INET6
1969         if (inp->inp_vflag & INP_IPV6)
1970                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1971         else
1972 #endif
1973         hashkey_faddr = inp->inp_faddr.s_addr;
1974
1975         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1976                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1977
1978         LIST_REMOVE(inp, inp_hash);
1979         LIST_INSERT_HEAD(head, inp, inp_hash);
1980
1981 #ifdef PCBGROUP
1982         if (m != NULL)
1983                 in_pcbgroup_update_mbuf(inp, m);
1984         else
1985                 in_pcbgroup_update(inp);
1986 #endif
1987 }
1988
1989 void
1990 in_pcbrehash(struct inpcb *inp)
1991 {
1992
1993         in_pcbrehash_mbuf(inp, NULL);
1994 }
1995
1996 /*
1997  * Remove PCB from various lists.
1998  */
1999 static void
2000 in_pcbremlists(struct inpcb *inp)
2001 {
2002         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
2003
2004         INP_INFO_WLOCK_ASSERT(pcbinfo);
2005         INP_WLOCK_ASSERT(inp);
2006
2007         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
2008         if (inp->inp_flags & INP_INHASHLIST) {
2009                 struct inpcbport *phd = inp->inp_phd;
2010
2011                 INP_HASH_WLOCK(pcbinfo);
2012                 LIST_REMOVE(inp, inp_hash);
2013                 LIST_REMOVE(inp, inp_portlist);
2014                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
2015                         LIST_REMOVE(phd, phd_hash);
2016                         free(phd, M_PCB);
2017                 }
2018                 INP_HASH_WUNLOCK(pcbinfo);
2019                 inp->inp_flags &= ~INP_INHASHLIST;
2020         }
2021         LIST_REMOVE(inp, inp_list);
2022         pcbinfo->ipi_count--;
2023 #ifdef PCBGROUP
2024         in_pcbgroup_remove(inp);
2025 #endif
2026 }
2027
2028 /*
2029  * A set label operation has occurred at the socket layer, propagate the
2030  * label change into the in_pcb for the socket.
2031  */
2032 void
2033 in_pcbsosetlabel(struct socket *so)
2034 {
2035 #ifdef MAC
2036         struct inpcb *inp;
2037
2038         inp = sotoinpcb(so);
2039         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
2040
2041         INP_WLOCK(inp);
2042         SOCK_LOCK(so);
2043         mac_inpcb_sosetlabel(so, inp);
2044         SOCK_UNLOCK(so);
2045         INP_WUNLOCK(inp);
2046 #endif
2047 }
2048
2049 /*
2050  * ipport_tick runs once per second, determining if random port allocation
2051  * should be continued.  If more than ipport_randomcps ports have been
2052  * allocated in the last second, then we return to sequential port
2053  * allocation. We return to random allocation only once we drop below
2054  * ipport_randomcps for at least ipport_randomtime seconds.
2055  */
2056 static void
2057 ipport_tick(void *xtp)
2058 {
2059         VNET_ITERATOR_DECL(vnet_iter);
2060
2061         VNET_LIST_RLOCK_NOSLEEP();
2062         VNET_FOREACH(vnet_iter) {
2063                 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
2064                 if (V_ipport_tcpallocs <=
2065                     V_ipport_tcplastcount + V_ipport_randomcps) {
2066                         if (V_ipport_stoprandom > 0)
2067                                 V_ipport_stoprandom--;
2068                 } else
2069                         V_ipport_stoprandom = V_ipport_randomtime;
2070                 V_ipport_tcplastcount = V_ipport_tcpallocs;
2071                 CURVNET_RESTORE();
2072         }
2073         VNET_LIST_RUNLOCK_NOSLEEP();
2074         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
2075 }
2076
2077 static void
2078 ip_fini(void *xtp)
2079 {
2080
2081         callout_stop(&ipport_tick_callout);
2082 }
2083
2084 /*
2085  * The ipport_callout should start running at about the time we attach the
2086  * inet or inet6 domains.
2087  */
2088 static void
2089 ipport_tick_init(const void *unused __unused)
2090 {
2091
2092         /* Start ipport_tick. */
2093         callout_init(&ipport_tick_callout, CALLOUT_MPSAFE);
2094         callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL);
2095         EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL,
2096                 SHUTDOWN_PRI_DEFAULT);
2097 }
2098 SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
2099     ipport_tick_init, NULL);
2100
2101 void
2102 inp_wlock(struct inpcb *inp)
2103 {
2104
2105         INP_WLOCK(inp);
2106 }
2107
2108 void
2109 inp_wunlock(struct inpcb *inp)
2110 {
2111
2112         INP_WUNLOCK(inp);
2113 }
2114
2115 void
2116 inp_rlock(struct inpcb *inp)
2117 {
2118
2119         INP_RLOCK(inp);
2120 }
2121
2122 void
2123 inp_runlock(struct inpcb *inp)
2124 {
2125
2126         INP_RUNLOCK(inp);
2127 }
2128
2129 #ifdef INVARIANTS
2130 void
2131 inp_lock_assert(struct inpcb *inp)
2132 {
2133
2134         INP_WLOCK_ASSERT(inp);
2135 }
2136
2137 void
2138 inp_unlock_assert(struct inpcb *inp)
2139 {
2140
2141         INP_UNLOCK_ASSERT(inp);
2142 }
2143 #endif
2144
2145 void
2146 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
2147 {
2148         struct inpcb *inp;
2149
2150         INP_INFO_RLOCK(&V_tcbinfo);
2151         LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
2152                 INP_WLOCK(inp);
2153                 func(inp, arg);
2154                 INP_WUNLOCK(inp);
2155         }
2156         INP_INFO_RUNLOCK(&V_tcbinfo);
2157 }
2158
2159 struct socket *
2160 inp_inpcbtosocket(struct inpcb *inp)
2161 {
2162
2163         INP_WLOCK_ASSERT(inp);
2164         return (inp->inp_socket);
2165 }
2166
2167 struct tcpcb *
2168 inp_inpcbtotcpcb(struct inpcb *inp)
2169 {
2170
2171         INP_WLOCK_ASSERT(inp);
2172         return ((struct tcpcb *)inp->inp_ppcb);
2173 }
2174
2175 int
2176 inp_ip_tos_get(const struct inpcb *inp)
2177 {
2178
2179         return (inp->inp_ip_tos);
2180 }
2181
2182 void
2183 inp_ip_tos_set(struct inpcb *inp, int val)
2184 {
2185
2186         inp->inp_ip_tos = val;
2187 }
2188
2189 void
2190 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
2191     uint32_t *faddr, uint16_t *fp)
2192 {
2193
2194         INP_LOCK_ASSERT(inp);
2195         *laddr = inp->inp_laddr.s_addr;
2196         *faddr = inp->inp_faddr.s_addr;
2197         *lp = inp->inp_lport;
2198         *fp = inp->inp_fport;
2199 }
2200
2201 struct inpcb *
2202 so_sotoinpcb(struct socket *so)
2203 {
2204
2205         return (sotoinpcb(so));
2206 }
2207
2208 struct tcpcb *
2209 so_sototcpcb(struct socket *so)
2210 {
2211
2212         return (sototcpcb(so));
2213 }
2214
2215 #ifdef DDB
2216 static void
2217 db_print_indent(int indent)
2218 {
2219         int i;
2220
2221         for (i = 0; i < indent; i++)
2222                 db_printf(" ");
2223 }
2224
2225 static void
2226 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
2227 {
2228         char faddr_str[48], laddr_str[48];
2229
2230         db_print_indent(indent);
2231         db_printf("%s at %p\n", name, inc);
2232
2233         indent += 2;
2234
2235 #ifdef INET6
2236         if (inc->inc_flags & INC_ISIPV6) {
2237                 /* IPv6. */
2238                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
2239                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
2240         } else
2241 #endif
2242         {
2243                 /* IPv4. */
2244                 inet_ntoa_r(inc->inc_laddr, laddr_str);
2245                 inet_ntoa_r(inc->inc_faddr, faddr_str);
2246         }
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 /* DDB */