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
 471 /*
 472  * Return cached socket options.
 473  */
 474 short
 475 inp_so_options(const struct inpcb *inp)
 476 {
 477    short so_options;
 478
 479    so_options = 0;
 480
 481    if ((inp->inp_flags2 & INP_REUSEPORT) != 0)
 482            so_options |= SO_REUSEPORT;
 483    if ((inp->inp_flags2 & INP_REUSEADDR) != 0)
 484            so_options |= SO_REUSEADDR;
 485    return (so_options);
 486 }
 487 #endif /* INET || INET6 */
 488
 489 #ifdef INET
 490 /*
 491  * Set up a bind operation on a PCB, performing port allocation
 492  * as required, but do not actually modify the PCB. Callers can
 493  * either complete the bind by setting inp_laddr/inp_lport and
 494  * calling in_pcbinshash(), or they can just use the resulting
 495  * port and address to authorise the sending of a once-off packet.
 496  *
 497  * On error, the values of *laddrp and *lportp are not changed.
 498  */
 499 int
 500 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 501     u_short *lportp, struct ucred *cred)
 502 {
 503         struct socket *so = inp->inp_socket;
 504         struct sockaddr_in *sin;
 505         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 506         struct in_addr laddr;
 507         u_short lport = 0;
 508         int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT);
 509         int error;
 510
 511         /*
 512          * No state changes, so read locks are sufficient here.
 513          */
 514         INP_LOCK_ASSERT(inp);
 515         INP_HASH_LOCK_ASSERT(pcbinfo);
 516
 517         if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
 518                 return (EADDRNOTAVAIL);
 519         laddr.s_addr = *laddrp;
 520         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 521                 return (EINVAL);
 522         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 523                 lookupflags = INPLOOKUP_WILDCARD;
 524         if (nam == NULL) {
 525                 if ((error = prison_local_ip4(cred, &laddr)) != 0)
 526                         return (error);
 527         } else {
 528                 sin = (struct sockaddr_in *)nam;
 529                 if (nam->sa_len != sizeof (*sin))
 530                         return (EINVAL);
 531 #ifdef notdef
 532                 /*
 533                  * We should check the family, but old programs
 534                  * incorrectly fail to initialize it.
 535                  */
 536                 if (sin->sin_family != AF_INET)
 537                         return (EAFNOSUPPORT);
 538 #endif
 539                 error = prison_local_ip4(cred, &sin->sin_addr);
 540                 if (error)
 541                         return (error);
 542                 if (sin->sin_port != *lportp) {
 543                         /* Don't allow the port to change. */
 544                         if (*lportp != 0)
 545                                 return (EINVAL);
 546                         lport = sin->sin_port;
 547                 }
 548                 /* NB: lport is left as 0 if the port isn't being changed. */
 549                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 550                         /*
 551                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 552                          * allow complete duplication of binding if
 553                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 554                          * and a multicast address is bound on both
 555                          * new and duplicated sockets.
 556                          */
 557                         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
 558                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 559                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 560                         sin->sin_port = 0;              /* yech... */
 561                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 562                         /*
 563                          * Is the address a local IP address?
 564                          * If INP_BINDANY is set, then the socket may be bound
 565                          * to any endpoint address, local or not.
 566                          */
 567                         if ((inp->inp_flags & INP_BINDANY) == 0 &&
 568                             ifa_ifwithaddr_check((struct sockaddr *)sin) == 0)
 569                                 return (EADDRNOTAVAIL);
 570                 }
 571                 laddr = sin->sin_addr;
 572                 if (lport) {
 573                         struct inpcb *t;
 574                         struct tcptw *tw;
 575
 576                         /* GROSS */
 577                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 578                             ntohs(lport) >= V_ipport_reservedlow &&
 579                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 580                             0))
 581                                 return (EACCES);
 582                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 583                             priv_check_cred(inp->inp_cred,
 584                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 585                                 t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 586                                     lport, INPLOOKUP_WILDCARD, cred);
 587         /*
 588          * XXX
 589          * This entire block sorely needs a rewrite.
 590          */
 591                                 if (t &&
 592                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 593                                     (so->so_type != SOCK_STREAM ||
 594                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
 595                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
 596                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 597                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
 598                                     (inp->inp_cred->cr_uid !=
 599                                      t->inp_cred->cr_uid))
 600                                         return (EADDRINUSE);
 601                         }
 602                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 603                             lport, lookupflags, cred);
 604                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 605                                 /*
 606                                  * XXXRW: If an incpb has had its timewait
 607                                  * state recycled, we treat the address as
 608                                  * being in use (for now).  This is better
 609                                  * than a panic, but not desirable.
 610                                  */
 611                                 tw = intotw(t);
 612                                 if (tw == NULL ||
 613                                     (reuseport & tw->tw_so_options) == 0)
 614                                         return (EADDRINUSE);
 615                         } else if (t && (reuseport & inp_so_options(t)) == 0) {
 616 #ifdef INET6
 617                                 if (ntohl(sin->sin_addr.s_addr) !=
 618                                     INADDR_ANY ||
 619                                     ntohl(t->inp_laddr.s_addr) !=
 620                                     INADDR_ANY ||
 621                                     (inp->inp_vflag & INP_IPV6PROTO) == 0 ||
 622                                     (t->inp_vflag & INP_IPV6PROTO) == 0)
 623 #endif
 624                                 return (EADDRINUSE);
 625                         }
 626                 }
 627         }
 628         if (*lportp != 0)
 629                 lport = *lportp;
 630         if (lport == 0) {
 631                 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags);
 632                 if (error != 0)
 633                         return (error);
 634
 635         }
 636         *laddrp = laddr.s_addr;
 637         *lportp = lport;
 638         return (0);
 639 }
 640
 641 /*
 642  * Connect from a socket to a specified address.
 643  * Both address and port must be specified in argument sin.
 644  * If don't have a local address for this socket yet,
 645  * then pick one.
 646  */
 647 int
 648 in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
 649     struct ucred *cred, struct mbuf *m)
 650 {
 651         u_short lport, fport;
 652         in_addr_t laddr, faddr;
 653         int anonport, error;
 654
 655         INP_WLOCK_ASSERT(inp);
 656         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 657
 658         lport = inp->inp_lport;
 659         laddr = inp->inp_laddr.s_addr;
 660         anonport = (lport == 0);
 661         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 662             NULL, cred);
 663         if (error)
 664                 return (error);
 665
 666         /* Do the initial binding of the local address if required. */
 667         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 668                 inp->inp_lport = lport;
 669                 inp->inp_laddr.s_addr = laddr;
 670                 if (in_pcbinshash(inp) != 0) {
 671                         inp->inp_laddr.s_addr = INADDR_ANY;
 672                         inp->inp_lport = 0;
 673                         return (EAGAIN);
 674                 }
 675         }
 676
 677         /* Commit the remaining changes. */
 678         inp->inp_lport = lport;
 679         inp->inp_laddr.s_addr = laddr;
 680         inp->inp_faddr.s_addr = faddr;
 681         inp->inp_fport = fport;
 682         in_pcbrehash_mbuf(inp, m);
 683
 684         if (anonport)
 685                 inp->inp_flags |= INP_ANONPORT;
 686         return (0);
 687 }
 688
 689 int
 690 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 691 {
 692
 693         return (in_pcbconnect_mbuf(inp, nam, cred, NULL));
 694 }
 695
 696 /*
 697  * Do proper source address selection on an unbound socket in case
 698  * of connect. Take jails into account as well.
 699  */
 700 static int
 701 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
 702     struct ucred *cred)
 703 {
 704         struct ifaddr *ifa;
 705         struct sockaddr *sa;
 706         struct sockaddr_in *sin;
 707         struct route sro;
 708         int error;
 709
 710         KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
 711
 712         /*
 713          * Bypass source address selection and use the primary jail IP
 714          * if requested.
 715          */
 716         if (cred != NULL && !prison_saddrsel_ip4(cred, laddr))
 717                 return (0);
 718
 719         error = 0;
 720         bzero(&sro, sizeof(sro));
 721
 722         sin = (struct sockaddr_in *)&sro.ro_dst;
 723         sin->sin_family = AF_INET;
 724         sin->sin_len = sizeof(struct sockaddr_in);
 725         sin->sin_addr.s_addr = faddr->s_addr;
 726
 727         /*
 728          * If route is known our src addr is taken from the i/f,
 729          * else punt.
 730          *
 731          * Find out route to destination.
 732          */
 733         if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 734                 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
 735
 736         /*
 737          * If we found a route, use the address corresponding to
 738          * the outgoing interface.
 739          *
 740          * Otherwise assume faddr is reachable on a directly connected
 741          * network and try to find a corresponding interface to take
 742          * the source address from.
 743          */
 744         if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
 745                 struct in_ifaddr *ia;
 746                 struct ifnet *ifp;
 747
 748                 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin));
 749                 if (ia == NULL)
 750                         ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0));
 751                 if (ia == NULL) {
 752                         error = ENETUNREACH;
 753                         goto done;
 754                 }
 755
 756                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 757                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 758                         ifa_free(&ia->ia_ifa);
 759                         goto done;
 760                 }
 761
 762                 ifp = ia->ia_ifp;
 763                 ifa_free(&ia->ia_ifa);
 764                 ia = NULL;
 765                 IF_ADDR_RLOCK(ifp);
 766                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 767
 768                         sa = ifa->ifa_addr;
 769                         if (sa->sa_family != AF_INET)
 770                                 continue;
 771                         sin = (struct sockaddr_in *)sa;
 772                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 773                                 ia = (struct in_ifaddr *)ifa;
 774                                 break;
 775                         }
 776                 }
 777                 if (ia != NULL) {
 778                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 779                         IF_ADDR_RUNLOCK(ifp);
 780                         goto done;
 781                 }
 782                 IF_ADDR_RUNLOCK(ifp);
 783
 784                 /* 3. As a last resort return the 'default' jail address. */
 785                 error = prison_get_ip4(cred, laddr);
 786                 goto done;
 787         }
 788
 789         /*
 790          * If the outgoing interface on the route found is not
 791          * a loopback interface, use the address from that interface.
 792          * In case of jails do those three steps:
 793          * 1. check if the interface address belongs to the jail. If so use it.
 794          * 2. check if we have any address on the outgoing interface
 795          *    belonging to this jail. If so use it.
 796          * 3. as a last resort return the 'default' jail address.
 797          */
 798         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
 799                 struct in_ifaddr *ia;
 800                 struct ifnet *ifp;
 801
 802                 /* If not jailed, use the default returned. */
 803                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 804                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 805                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 806                         goto done;
 807                 }
 808
 809                 /* Jailed. */
 810                 /* 1. Check if the iface address belongs to the jail. */
 811                 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
 812                 if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 813                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 814                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 815                         goto done;
 816                 }
 817
 818                 /*
 819                  * 2. Check if we have any address on the outgoing interface
 820                  *    belonging to this jail.
 821                  */
 822                 ia = NULL;
 823                 ifp = sro.ro_rt->rt_ifp;
 824                 IF_ADDR_RLOCK(ifp);
 825                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 826                         sa = ifa->ifa_addr;
 827                         if (sa->sa_family != AF_INET)
 828                                 continue;
 829                         sin = (struct sockaddr_in *)sa;
 830                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 831                                 ia = (struct in_ifaddr *)ifa;
 832                                 break;
 833                         }
 834                 }
 835                 if (ia != NULL) {
 836                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 837                         IF_ADDR_RUNLOCK(ifp);
 838                         goto done;
 839                 }
 840                 IF_ADDR_RUNLOCK(ifp);
 841
 842                 /* 3. As a last resort return the 'default' jail address. */
 843                 error = prison_get_ip4(cred, laddr);
 844                 goto done;
 845         }
 846
 847         /*
 848          * The outgoing interface is marked with 'loopback net', so a route
 849          * to ourselves is here.
 850          * Try to find the interface of the destination address and then
 851          * take the address from there. That interface is not necessarily
 852          * a loopback interface.
 853          * In case of jails, check that it is an address of the jail
 854          * and if we cannot find, fall back to the 'default' jail address.
 855          */
 856         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
 857                 struct sockaddr_in sain;
 858                 struct in_ifaddr *ia;
 859
 860                 bzero(&sain, sizeof(struct sockaddr_in));
 861                 sain.sin_family = AF_INET;
 862                 sain.sin_len = sizeof(struct sockaddr_in);
 863                 sain.sin_addr.s_addr = faddr->s_addr;
 864
 865                 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain)));
 866                 if (ia == NULL)
 867                         ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0));
 868                 if (ia == NULL)
 869                         ia = ifatoia(ifa_ifwithaddr(sintosa(&sain)));
 870
 871                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 872                         if (ia == NULL) {
 873                                 error = ENETUNREACH;
 874                                 goto done;
 875                         }
 876                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 877                         ifa_free(&ia->ia_ifa);
 878                         goto done;
 879                 }
 880
 881                 /* Jailed. */
 882                 if (ia != NULL) {
 883                         struct ifnet *ifp;
 884
 885                         ifp = ia->ia_ifp;
 886                         ifa_free(&ia->ia_ifa);
 887                         ia = NULL;
 888                         IF_ADDR_RLOCK(ifp);
 889                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 890
 891                                 sa = ifa->ifa_addr;
 892                                 if (sa->sa_family != AF_INET)
 893                                         continue;
 894                                 sin = (struct sockaddr_in *)sa;
 895                                 if (prison_check_ip4(cred,
 896                                     &sin->sin_addr) == 0) {
 897                                         ia = (struct in_ifaddr *)ifa;
 898                                         break;
 899                                 }
 900                         }
 901                         if (ia != NULL) {
 902                                 laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 903                                 IF_ADDR_RUNLOCK(ifp);
 904                                 goto done;
 905                         }
 906                         IF_ADDR_RUNLOCK(ifp);
 907                 }
 908
 909                 /* 3. As a last resort return the 'default' jail address. */
 910                 error = prison_get_ip4(cred, laddr);
 911                 goto done;
 912         }
 913
 914 done:
 915         if (sro.ro_rt != NULL)
 916                 RTFREE(sro.ro_rt);
 917         return (error);
 918 }
 919
 920 /*
 921  * Set up for a connect from a socket to the specified address.
 922  * On entry, *laddrp and *lportp should contain the current local
 923  * address and port for the PCB; these are updated to the values
 924  * that should be placed in inp_laddr and inp_lport to complete
 925  * the connect.
 926  *
 927  * On success, *faddrp and *fportp will be set to the remote address
 928  * and port. These are not updated in the error case.
 929  *
 930  * If the operation fails because the connection already exists,
 931  * *oinpp will be set to the PCB of that connection so that the
 932  * caller can decide to override it. In all other cases, *oinpp
 933  * is set to NULL.
 934  */
 935 int
 936 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 937     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 938     struct inpcb **oinpp, struct ucred *cred)
 939 {
 940         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 941         struct in_ifaddr *ia;
 942         struct inpcb *oinp;
 943         struct in_addr laddr, faddr;
 944         u_short lport, fport;
 945         int error;
 946
 947         /*
 948          * Because a global state change doesn't actually occur here, a read
 949          * lock is sufficient.
 950          */
 951         INP_LOCK_ASSERT(inp);
 952         INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo);
 953
 954         if (oinpp != NULL)
 955                 *oinpp = NULL;
 956         if (nam->sa_len != sizeof (*sin))
 957                 return (EINVAL);
 958         if (sin->sin_family != AF_INET)
 959                 return (EAFNOSUPPORT);
 960         if (sin->sin_port == 0)
 961                 return (EADDRNOTAVAIL);
 962         laddr.s_addr = *laddrp;
 963         lport = *lportp;
 964         faddr = sin->sin_addr;
 965         fport = sin->sin_port;
 966
 967         if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
 968                 /*
 969                  * If the destination address is INADDR_ANY,
 970                  * use the primary local address.
 971                  * If the supplied address is INADDR_BROADCAST,
 972                  * and the primary interface supports broadcast,
 973                  * choose the broadcast address for that interface.
 974                  */
 975                 if (faddr.s_addr == INADDR_ANY) {
 976                         IN_IFADDR_RLOCK();
 977                         faddr =
 978                             IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
 979                         IN_IFADDR_RUNLOCK();
 980                         if (cred != NULL &&
 981                             (error = prison_get_ip4(cred, &faddr)) != 0)
 982                                 return (error);
 983                 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
 984                         IN_IFADDR_RLOCK();
 985                         if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
 986                             IFF_BROADCAST)
 987                                 faddr = satosin(&TAILQ_FIRST(
 988                                     &V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
 989                         IN_IFADDR_RUNLOCK();
 990                 }
 991         }
 992         if (laddr.s_addr == INADDR_ANY) {
 993                 error = in_pcbladdr(inp, &faddr, &laddr, cred);
 994                 /*
 995                  * If the destination address is multicast and an outgoing
 996                  * interface has been set as a multicast option, prefer the
 997                  * address of that interface as our source address.
 998                  */
 999                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
1000                     inp->inp_moptions != NULL) {
1001                         struct ip_moptions *imo;
1002                         struct ifnet *ifp;
1003
1004                         imo = inp->inp_moptions;
1005                         if (imo->imo_multicast_ifp != NULL) {
1006                                 ifp = imo->imo_multicast_ifp;
1007                                 IN_IFADDR_RLOCK();
1008                                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1009                                         if ((ia->ia_ifp == ifp) &&
1010                                             (cred == NULL ||
1011                                             prison_check_ip4(cred,
1012                                             &ia->ia_addr.sin_addr) == 0))
1013                                                 break;
1014                                 }
1015                                 if (ia == NULL)
1016                                         error = EADDRNOTAVAIL;
1017                                 else {
1018                                         laddr = ia->ia_addr.sin_addr;
1019                                         error = 0;
1020                                 }
1021                                 IN_IFADDR_RUNLOCK();
1022                         }
1023                 }
1024                 if (error)
1025                         return (error);
1026         }
1027         oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, fport,
1028             laddr, lport, 0, NULL);
1029         if (oinp != NULL) {
1030                 if (oinpp != NULL)
1031                         *oinpp = oinp;
1032                 return (EADDRINUSE);
1033         }
1034         if (lport == 0) {
1035                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
1036                     cred);
1037                 if (error)
1038                         return (error);
1039         }
1040         *laddrp = laddr.s_addr;
1041         *lportp = lport;
1042         *faddrp = faddr.s_addr;
1043         *fportp = fport;
1044         return (0);
1045 }
1046
1047 void
1048 in_pcbdisconnect(struct inpcb *inp)
1049 {
1050
1051         INP_WLOCK_ASSERT(inp);
1052         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
1053
1054         inp->inp_faddr.s_addr = INADDR_ANY;
1055         inp->inp_fport = 0;
1056         in_pcbrehash(inp);
1057 }
1058 #endif /* INET */
1059
1060 /*
1061  * in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
1062  * For most protocols, this will be invoked immediately prior to calling
1063  * in_pcbfree().  However, with TCP the inpcb may significantly outlive the
1064  * socket, in which case in_pcbfree() is deferred.
1065  */
1066 void
1067 in_pcbdetach(struct inpcb *inp)
1068 {
1069
1070         KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
1071
1072         inp->inp_socket->so_pcb = NULL;
1073         inp->inp_socket = NULL;
1074 }
1075
1076 /*
1077  * in_pcbref() bumps the reference count on an inpcb in order to maintain
1078  * stability of an inpcb pointer despite the inpcb lock being released.  This
1079  * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
1080  * but where the inpcb lock may already held, or when acquiring a reference
1081  * via a pcbgroup.
1082  *
1083  * in_pcbref() should be used only to provide brief memory stability, and
1084  * must always be followed by a call to INP_WLOCK() and in_pcbrele() to
1085  * garbage collect the inpcb if it has been in_pcbfree()'d from another
1086  * context.  Until in_pcbrele() has returned that the inpcb is still valid,
1087  * lock and rele are the *only* safe operations that may be performed on the
1088  * inpcb.
1089  *
1090  * While the inpcb will not be freed, releasing the inpcb lock means that the
1091  * connection's state may change, so the caller should be careful to
1092  * revalidate any cached state on reacquiring the lock.  Drop the reference
1093  * using in_pcbrele().
1094  */
1095 void
1096 in_pcbref(struct inpcb *inp)
1097 {
1098
1099         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1100
1101         refcount_acquire(&inp->inp_refcount);
1102 }
1103
1104 /*
1105  * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
1106  * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
1107  * return a flag indicating whether or not the inpcb remains valid.  If it is
1108  * valid, we return with the inpcb lock held.
1109  *
1110  * Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a
1111  * reference on an inpcb.  Historically more work was done here (actually, in
1112  * in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the
1113  * need for the pcbinfo lock in in_pcbrele().  Deferring the free is entirely
1114  * about memory stability (and continued use of the write lock).
1115  */
1116 int
1117 in_pcbrele_rlocked(struct inpcb *inp)
1118 {
1119         struct inpcbinfo *pcbinfo;
1120
1121         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1122
1123         INP_RLOCK_ASSERT(inp);
1124
1125         if (refcount_release(&inp->inp_refcount) == 0) {
1126                 /*
1127                  * If the inpcb has been freed, let the caller know, even if
1128                  * this isn't the last reference.
1129                  */
1130                 if (inp->inp_flags2 & INP_FREED) {
1131                         INP_RUNLOCK(inp);
1132                         return (1);
1133                 }
1134                 return (0);
1135         }
1136
1137         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1138
1139         INP_RUNLOCK(inp);
1140         pcbinfo = inp->inp_pcbinfo;
1141         uma_zfree(pcbinfo->ipi_zone, inp);
1142         return (1);
1143 }
1144
1145 int
1146 in_pcbrele_wlocked(struct inpcb *inp)
1147 {
1148         struct inpcbinfo *pcbinfo;
1149
1150         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1151
1152         INP_WLOCK_ASSERT(inp);
1153
1154         if (refcount_release(&inp->inp_refcount) == 0)
1155                 return (0);
1156
1157         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1158
1159         INP_WUNLOCK(inp);
1160         pcbinfo = inp->inp_pcbinfo;
1161         uma_zfree(pcbinfo->ipi_zone, inp);
1162         return (1);
1163 }
1164
1165 /*
1166  * Temporary wrapper.
1167  */
1168 int
1169 in_pcbrele(struct inpcb *inp)
1170 {
1171
1172         return (in_pcbrele_wlocked(inp));
1173 }
1174
1175 /*
1176  * Unconditionally schedule an inpcb to be freed by decrementing its
1177  * reference count, which should occur only after the inpcb has been detached
1178  * from its socket.  If another thread holds a temporary reference (acquired
1179  * using in_pcbref()) then the free is deferred until that reference is
1180  * released using in_pcbrele(), but the inpcb is still unlocked.  Almost all
1181  * work, including removal from global lists, is done in this context, where
1182  * the pcbinfo lock is held.
1183  */
1184 void
1185 in_pcbfree(struct inpcb *inp)
1186 {
1187         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1188
1189         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1190
1191         INP_INFO_WLOCK_ASSERT(pcbinfo);
1192         INP_WLOCK_ASSERT(inp);
1193
1194         /* XXXRW: Do as much as possible here. */
1195 #ifdef IPSEC
1196         if (inp->inp_sp != NULL)
1197                 ipsec_delete_pcbpolicy(inp);
1198 #endif
1199         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1200         in_pcbremlists(inp);
1201 #ifdef INET6
1202         if (inp->inp_vflag & INP_IPV6PROTO) {
1203                 ip6_freepcbopts(inp->in6p_outputopts);
1204                 if (inp->in6p_moptions != NULL)
1205                         ip6_freemoptions(inp->in6p_moptions);
1206         }
1207 #endif
1208         if (inp->inp_options)
1209                 (void)m_free(inp->inp_options);
1210 #ifdef INET
1211         if (inp->inp_moptions != NULL)
1212                 inp_freemoptions(inp->inp_moptions);
1213 #endif
1214         inp->inp_vflag = 0;
1215         inp->inp_flags2 |= INP_FREED;
1216         crfree(inp->inp_cred);
1217 #ifdef MAC
1218         mac_inpcb_destroy(inp);
1219 #endif
1220         if (!in_pcbrele_wlocked(inp))
1221                 INP_WUNLOCK(inp);
1222 }
1223
1224 /*
1225  * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
1226  * port reservation, and preventing it from being returned by inpcb lookups.
1227  *
1228  * It is used by TCP to mark an inpcb as unused and avoid future packet
1229  * delivery or event notification when a socket remains open but TCP has
1230  * closed.  This might occur as a result of a shutdown()-initiated TCP close
1231  * or a RST on the wire, and allows the port binding to be reused while still
1232  * maintaining the invariant that so_pcb always points to a valid inpcb until
1233  * in_pcbdetach().
1234  *
1235  * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
1236  * in_pcbnotifyall() and in_pcbpurgeif0()?
1237  */
1238 void
1239 in_pcbdrop(struct inpcb *inp)
1240 {
1241
1242         INP_WLOCK_ASSERT(inp);
1243
1244         /*
1245          * XXXRW: Possibly we should protect the setting of INP_DROPPED with
1246          * the hash lock...?
1247          */
1248         inp->inp_flags |= INP_DROPPED;
1249         if (inp->inp_flags & INP_INHASHLIST) {
1250                 struct inpcbport *phd = inp->inp_phd;
1251
1252                 INP_HASH_WLOCK(inp->inp_pcbinfo);
1253                 LIST_REMOVE(inp, inp_hash);
1254                 LIST_REMOVE(inp, inp_portlist);
1255                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1256                         LIST_REMOVE(phd, phd_hash);
1257                         free(phd, M_PCB);
1258                 }
1259                 INP_HASH_WUNLOCK(inp->inp_pcbinfo);
1260                 inp->inp_flags &= ~INP_INHASHLIST;
1261 #ifdef PCBGROUP
1262                 in_pcbgroup_remove(inp);
1263 #endif
1264         }
1265 }
1266
1267 #ifdef INET
1268 /*
1269  * Common routines to return the socket addresses associated with inpcbs.
1270  */
1271 struct sockaddr *
1272 in_sockaddr(in_port_t port, struct in_addr *addr_p)
1273 {
1274         struct sockaddr_in *sin;
1275
1276         sin = malloc(sizeof *sin, M_SONAME,
1277                 M_WAITOK | M_ZERO);
1278         sin->sin_family = AF_INET;
1279         sin->sin_len = sizeof(*sin);
1280         sin->sin_addr = *addr_p;
1281         sin->sin_port = port;
1282
1283         return (struct sockaddr *)sin;
1284 }
1285
1286 int
1287 in_getsockaddr(struct socket *so, struct sockaddr **nam)
1288 {
1289         struct inpcb *inp;
1290         struct in_addr addr;
1291         in_port_t port;
1292
1293         inp = sotoinpcb(so);
1294         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
1295
1296         INP_RLOCK(inp);
1297         port = inp->inp_lport;
1298         addr = inp->inp_laddr;
1299         INP_RUNLOCK(inp);
1300
1301         *nam = in_sockaddr(port, &addr);
1302         return 0;
1303 }
1304
1305 int
1306 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
1307 {
1308         struct inpcb *inp;
1309         struct in_addr addr;
1310         in_port_t port;
1311
1312         inp = sotoinpcb(so);
1313         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
1314
1315         INP_RLOCK(inp);
1316         port = inp->inp_fport;
1317         addr = inp->inp_faddr;
1318         INP_RUNLOCK(inp);
1319
1320         *nam = in_sockaddr(port, &addr);
1321         return 0;
1322 }
1323
1324 void
1325 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
1326     struct inpcb *(*notify)(struct inpcb *, int))
1327 {
1328         struct inpcb *inp, *inp_temp;
1329
1330         INP_INFO_WLOCK(pcbinfo);
1331         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
1332                 INP_WLOCK(inp);
1333 #ifdef INET6
1334                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1335                         INP_WUNLOCK(inp);
1336                         continue;
1337                 }
1338 #endif
1339                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1340                     inp->inp_socket == NULL) {
1341                         INP_WUNLOCK(inp);
1342                         continue;
1343                 }
1344                 if ((*notify)(inp, errno))
1345                         INP_WUNLOCK(inp);
1346         }
1347         INP_INFO_WUNLOCK(pcbinfo);
1348 }
1349
1350 void
1351 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
1352 {
1353         struct inpcb *inp;
1354         struct ip_moptions *imo;
1355         int i, gap;
1356
1357         INP_INFO_RLOCK(pcbinfo);
1358         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
1359                 INP_WLOCK(inp);
1360                 imo = inp->inp_moptions;
1361                 if ((inp->inp_vflag & INP_IPV4) &&
1362                     imo != NULL) {
1363                         /*
1364                          * Unselect the outgoing interface if it is being
1365                          * detached.
1366                          */
1367                         if (imo->imo_multicast_ifp == ifp)
1368                                 imo->imo_multicast_ifp = NULL;
1369
1370                         /*
1371                          * Drop multicast group membership if we joined
1372                          * through the interface being detached.
1373                          */
1374                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1375                             i++) {
1376                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1377                                         in_delmulti(imo->imo_membership[i]);
1378                                         gap++;
1379                                 } else if (gap != 0)
1380                                         imo->imo_membership[i - gap] =
1381                                             imo->imo_membership[i];
1382                         }
1383                         imo->imo_num_memberships -= gap;
1384                 }
1385                 INP_WUNLOCK(inp);
1386         }
1387         INP_INFO_RUNLOCK(pcbinfo);
1388 }
1389
1390 /*
1391  * Lookup a PCB based on the local address and port.  Caller must hold the
1392  * hash lock.  No inpcb locks or references are acquired.
1393  */
1394 #define INP_LOOKUP_MAPPED_PCB_COST      3
1395 struct inpcb *
1396 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
1397     u_short lport, int lookupflags, struct ucred *cred)
1398 {
1399         struct inpcb *inp;
1400 #ifdef INET6
1401         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
1402 #else
1403         int matchwild = 3;
1404 #endif
1405         int wildcard;
1406
1407         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1408             ("%s: invalid lookup flags %d", __func__, lookupflags));
1409
1410         INP_HASH_LOCK_ASSERT(pcbinfo);
1411
1412         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
1413                 struct inpcbhead *head;
1414                 /*
1415                  * Look for an unconnected (wildcard foreign addr) PCB that
1416                  * matches the local address and port we're looking for.
1417                  */
1418                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1419                     0, pcbinfo->ipi_hashmask)];
1420                 LIST_FOREACH(inp, head, inp_hash) {
1421 #ifdef INET6
1422                         /* XXX inp locking */
1423                         if ((inp->inp_vflag & INP_IPV4) == 0)
1424                                 continue;
1425 #endif
1426                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1427                             inp->inp_laddr.s_addr == laddr.s_addr &&
1428                             inp->inp_lport == lport) {
1429                                 /*
1430                                  * Found?
1431                                  */
1432                                 if (cred == NULL ||
1433                                     prison_equal_ip4(cred->cr_prison,
1434                                         inp->inp_cred->cr_prison))
1435                                         return (inp);
1436                         }
1437                 }
1438                 /*
1439                  * Not found.
1440                  */
1441                 return (NULL);
1442         } else {
1443                 struct inpcbporthead *porthash;
1444                 struct inpcbport *phd;
1445                 struct inpcb *match = NULL;
1446                 /*
1447                  * Best fit PCB lookup.
1448                  *
1449                  * First see if this local port is in use by looking on the
1450                  * port hash list.
1451                  */
1452                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
1453                     pcbinfo->ipi_porthashmask)];
1454                 LIST_FOREACH(phd, porthash, phd_hash) {
1455                         if (phd->phd_port == lport)
1456                                 break;
1457                 }
1458                 if (phd != NULL) {
1459                         /*
1460                          * Port is in use by one or more PCBs. Look for best
1461                          * fit.
1462                          */
1463                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1464                                 wildcard = 0;
1465                                 if (cred != NULL &&
1466                                     !prison_equal_ip4(inp->inp_cred->cr_prison,
1467                                         cred->cr_prison))
1468                                         continue;
1469 #ifdef INET6
1470                                 /* XXX inp locking */
1471                                 if ((inp->inp_vflag & INP_IPV4) == 0)
1472                                         continue;
1473                                 /*
1474                                  * We never select the PCB that has
1475                                  * INP_IPV6 flag and is bound to :: if
1476                                  * we have another PCB which is bound
1477                                  * to 0.0.0.0.  If a PCB has the
1478                                  * INP_IPV6 flag, then we set its cost
1479                                  * higher than IPv4 only PCBs.
1480                                  *
1481                                  * Note that the case only happens
1482                                  * when a socket is bound to ::, under
1483                                  * the condition that the use of the
1484                                  * mapped address is allowed.
1485                                  */
1486                                 if ((inp->inp_vflag & INP_IPV6) != 0)
1487                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
1488 #endif
1489                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
1490                                         wildcard++;
1491                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
1492                                         if (laddr.s_addr == INADDR_ANY)
1493                                                 wildcard++;
1494                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
1495                                                 continue;
1496                                 } else {
1497                                         if (laddr.s_addr != INADDR_ANY)
1498                                                 wildcard++;
1499                                 }
1500                                 if (wildcard < matchwild) {
1501                                         match = inp;
1502                                         matchwild = wildcard;
1503                                         if (matchwild == 0)
1504                                                 break;
1505                                 }
1506                         }
1507                 }
1508                 return (match);
1509         }
1510 }
1511 #undef INP_LOOKUP_MAPPED_PCB_COST
1512
1513 #ifdef PCBGROUP
1514 /*
1515  * Lookup PCB in hash list, using pcbgroup tables.
1516  */
1517 static struct inpcb *
1518 in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
1519     struct in_addr faddr, u_int fport_arg, struct in_addr laddr,
1520     u_int lport_arg, int lookupflags, struct ifnet *ifp)
1521 {
1522         struct inpcbhead *head;
1523         struct inpcb *inp, *tmpinp;
1524         u_short fport = fport_arg, lport = lport_arg;
1525
1526         /*
1527          * First look for an exact match.
1528          */
1529         tmpinp = NULL;
1530         INP_GROUP_LOCK(pcbgroup);
1531         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1532             pcbgroup->ipg_hashmask)];
1533         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
1534 #ifdef INET6
1535                 /* XXX inp locking */
1536                 if ((inp->inp_vflag & INP_IPV4) == 0)
1537                         continue;
1538 #endif
1539                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1540                     inp->inp_laddr.s_addr == laddr.s_addr &&
1541                     inp->inp_fport == fport &&
1542                     inp->inp_lport == lport) {
1543                         /*
1544                          * XXX We should be able to directly return
1545                          * the inp here, without any checks.
1546                          * Well unless both bound with SO_REUSEPORT?
1547                          */
1548                         if (prison_flag(inp->inp_cred, PR_IP4))
1549                                 goto found;
1550                         if (tmpinp == NULL)
1551                                 tmpinp = inp;
1552                 }
1553         }
1554         if (tmpinp != NULL) {
1555                 inp = tmpinp;
1556                 goto found;
1557         }
1558
1559         /*
1560          * Then look for a wildcard match, if requested.
1561          */
1562         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1563                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1564 #ifdef INET6
1565                 struct inpcb *local_wild_mapped = NULL;
1566 #endif
1567                 struct inpcb *jail_wild = NULL;
1568                 struct inpcbhead *head;
1569                 int injail;
1570
1571                 /*
1572                  * Order of socket selection - we always prefer jails.
1573                  *      1. jailed, non-wild.
1574                  *      2. jailed, wild.
1575                  *      3. non-jailed, non-wild.
1576                  *      4. non-jailed, wild.
1577                  */
1578                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
1579                     0, pcbinfo->ipi_wildmask)];
1580                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
1581 #ifdef INET6
1582                         /* XXX inp locking */
1583                         if ((inp->inp_vflag & INP_IPV4) == 0)
1584                                 continue;
1585 #endif
1586                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1587                             inp->inp_lport != lport)
1588                                 continue;
1589
1590                         /* XXX inp locking */
1591                         if (ifp && ifp->if_type == IFT_FAITH &&
1592                             (inp->inp_flags & INP_FAITH) == 0)
1593                                 continue;
1594
1595                         injail = prison_flag(inp->inp_cred, PR_IP4);
1596                         if (injail) {
1597                                 if (prison_check_ip4(inp->inp_cred,
1598                                     &laddr) != 0)
1599                                         continue;
1600                         } else {
1601                                 if (local_exact != NULL)
1602                                         continue;
1603                         }
1604
1605                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1606                                 if (injail)
1607                                         goto found;
1608                                 else
1609                                         local_exact = inp;
1610                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1611 #ifdef INET6
1612                                 /* XXX inp locking, NULL check */
1613                                 if (inp->inp_vflag & INP_IPV6PROTO)
1614                                         local_wild_mapped = inp;
1615                                 else
1616 #endif
1617                                         if (injail)
1618                                                 jail_wild = inp;
1619                                         else
1620                                                 local_wild = inp;
1621                         }
1622                 } /* LIST_FOREACH */
1623                 inp = jail_wild;
1624                 if (inp == NULL)
1625                         inp = local_exact;
1626                 if (inp == NULL)
1627                         inp = local_wild;
1628 #ifdef INET6
1629                 if (inp == NULL)
1630                         inp = local_wild_mapped;
1631 #endif
1632                 if (inp != NULL)
1633                         goto found;
1634         } /* if (lookupflags & INPLOOKUP_WILDCARD) */
1635         INP_GROUP_UNLOCK(pcbgroup);
1636         return (NULL);
1637
1638 found:
1639         in_pcbref(inp);
1640         INP_GROUP_UNLOCK(pcbgroup);
1641         if (lookupflags & INPLOOKUP_WLOCKPCB) {
1642                 INP_WLOCK(inp);
1643                 if (in_pcbrele_wlocked(inp))
1644                         return (NULL);
1645         } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1646                 INP_RLOCK(inp);
1647                 if (in_pcbrele_rlocked(inp))
1648                         return (NULL);
1649         } else
1650                 panic("%s: locking bug", __func__);
1651         return (inp);
1652 }
1653 #endif /* PCBGROUP */
1654
1655 /*
1656  * Lookup PCB in hash list, using pcbinfo tables.  This variation assumes
1657  * that the caller has locked the hash list, and will not perform any further
1658  * locking or reference operations on either the hash list or the connection.
1659  */
1660 static struct inpcb *
1661 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1662     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags,
1663     struct ifnet *ifp)
1664 {
1665         struct inpcbhead *head;
1666         struct inpcb *inp, *tmpinp;
1667         u_short fport = fport_arg, lport = lport_arg;
1668
1669         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1670             ("%s: invalid lookup flags %d", __func__, lookupflags));
1671
1672         INP_HASH_LOCK_ASSERT(pcbinfo);
1673
1674         /*
1675          * First look for an exact match.
1676          */
1677         tmpinp = NULL;
1678         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1679             pcbinfo->ipi_hashmask)];
1680         LIST_FOREACH(inp, head, inp_hash) {
1681 #ifdef INET6
1682                 /* XXX inp locking */
1683                 if ((inp->inp_vflag & INP_IPV4) == 0)
1684                         continue;
1685 #endif
1686                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1687                     inp->inp_laddr.s_addr == laddr.s_addr &&
1688                     inp->inp_fport == fport &&
1689                     inp->inp_lport == lport) {
1690                         /*
1691                          * XXX We should be able to directly return
1692                          * the inp here, without any checks.
1693                          * Well unless both bound with SO_REUSEPORT?
1694                          */
1695                         if (prison_flag(inp->inp_cred, PR_IP4))
1696                                 return (inp);
1697                         if (tmpinp == NULL)
1698                                 tmpinp = inp;
1699                 }
1700         }
1701         if (tmpinp != NULL)
1702                 return (tmpinp);
1703
1704         /*
1705          * Then look for a wildcard match, if requested.
1706          */
1707         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1708                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1709 #ifdef INET6
1710                 struct inpcb *local_wild_mapped = NULL;
1711 #endif
1712                 struct inpcb *jail_wild = NULL;
1713                 int injail;
1714
1715                 /*
1716                  * Order of socket selection - we always prefer jails.
1717                  *      1. jailed, non-wild.
1718                  *      2. jailed, wild.
1719                  *      3. non-jailed, non-wild.
1720                  *      4. non-jailed, wild.
1721                  */
1722
1723                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1724                     0, pcbinfo->ipi_hashmask)];
1725                 LIST_FOREACH(inp, head, inp_hash) {
1726 #ifdef INET6
1727                         /* XXX inp locking */
1728                         if ((inp->inp_vflag & INP_IPV4) == 0)
1729                                 continue;
1730 #endif
1731                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1732                             inp->inp_lport != lport)
1733                                 continue;
1734
1735                         /* XXX inp locking */
1736                         if (ifp && ifp->if_type == IFT_FAITH &&
1737                             (inp->inp_flags & INP_FAITH) == 0)
1738                                 continue;
1739
1740                         injail = prison_flag(inp->inp_cred, PR_IP4);
1741                         if (injail) {
1742                                 if (prison_check_ip4(inp->inp_cred,
1743                                     &laddr) != 0)
1744                                         continue;
1745                         } else {
1746                                 if (local_exact != NULL)
1747                                         continue;
1748                         }
1749
1750                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1751                                 if (injail)
1752                                         return (inp);
1753                                 else
1754                                         local_exact = inp;
1755                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1756 #ifdef INET6
1757                                 /* XXX inp locking, NULL check */
1758                                 if (inp->inp_vflag & INP_IPV6PROTO)
1759                                         local_wild_mapped = inp;
1760                                 else
1761 #endif
1762                                         if (injail)
1763                                                 jail_wild = inp;
1764                                         else
1765                                                 local_wild = inp;
1766                         }
1767                 } /* LIST_FOREACH */
1768                 if (jail_wild != NULL)
1769                         return (jail_wild);
1770                 if (local_exact != NULL)
1771                         return (local_exact);
1772                 if (local_wild != NULL)
1773                         return (local_wild);
1774 #ifdef INET6
1775                 if (local_wild_mapped != NULL)
1776                         return (local_wild_mapped);
1777 #endif
1778         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1779
1780         return (NULL);
1781 }
1782
1783 /*
1784  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1785  * hash list lock, and will return the inpcb locked (i.e., requires
1786  * INPLOOKUP_LOCKPCB).
1787  */
1788 static struct inpcb *
1789 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1790     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1791     struct ifnet *ifp)
1792 {
1793         struct inpcb *inp;
1794
1795         INP_HASH_RLOCK(pcbinfo);
1796         inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1797             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1798         if (inp != NULL) {
1799                 in_pcbref(inp);
1800                 INP_HASH_RUNLOCK(pcbinfo);
1801                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1802                         INP_WLOCK(inp);
1803                         if (in_pcbrele_wlocked(inp))
1804                                 return (NULL);
1805                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1806                         INP_RLOCK(inp);
1807                         if (in_pcbrele_rlocked(inp))
1808                                 return (NULL);
1809                 } else
1810                         panic("%s: locking bug", __func__);
1811         } else
1812                 INP_HASH_RUNLOCK(pcbinfo);
1813         return (inp);
1814 }
1815
1816 /*
1817  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1818  * from which a pre-calculated hash value may be extracted.
1819  *
1820  * Possibly more of this logic should be in in_pcbgroup.c.
1821  */
1822 struct inpcb *
1823 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport,
1824     struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1825 {
1826 #if defined(PCBGROUP)
1827         struct inpcbgroup *pcbgroup;
1828 #endif
1829
1830         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1831             ("%s: invalid lookup flags %d", __func__, lookupflags));
1832         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1833             ("%s: LOCKPCB not set", __func__));
1834
1835 #if defined(PCBGROUP)
1836         if (in_pcbgroup_enabled(pcbinfo)) {
1837                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1838                     fport);
1839                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1840                     laddr, lport, lookupflags, ifp));
1841         }
1842 #endif
1843         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1844             lookupflags, ifp));
1845 }
1846
1847 struct inpcb *
1848 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1849     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1850     struct ifnet *ifp, struct mbuf *m)
1851 {
1852 #ifdef PCBGROUP
1853         struct inpcbgroup *pcbgroup;
1854 #endif
1855
1856         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1857             ("%s: invalid lookup flags %d", __func__, lookupflags));
1858         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1859             ("%s: LOCKPCB not set", __func__));
1860
1861 #ifdef PCBGROUP
1862         if (in_pcbgroup_enabled(pcbinfo)) {
1863                 pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1864                     m->m_pkthdr.flowid);
1865                 if (pcbgroup != NULL)
1866                         return (in_pcblookup_group(pcbinfo, pcbgroup, faddr,
1867                             fport, laddr, lport, lookupflags, ifp));
1868                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1869                     fport);
1870                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1871                     laddr, lport, lookupflags, ifp));
1872         }
1873 #endif
1874         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1875             lookupflags, ifp));
1876 }
1877 #endif /* INET */
1878
1879 /*
1880  * Insert PCB onto various hash lists.
1881  */
1882 static int
1883 in_pcbinshash_internal(struct inpcb *inp, int do_pcbgroup_update)
1884 {
1885         struct inpcbhead *pcbhash;
1886         struct inpcbporthead *pcbporthash;
1887         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1888         struct inpcbport *phd;
1889         u_int32_t hashkey_faddr;
1890
1891         INP_WLOCK_ASSERT(inp);
1892         INP_HASH_WLOCK_ASSERT(pcbinfo);
1893
1894         KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
1895             ("in_pcbinshash: INP_INHASHLIST"));
1896
1897 #ifdef INET6
1898         if (inp->inp_vflag & INP_IPV6)
1899                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1900         else
1901 #endif
1902         hashkey_faddr = inp->inp_faddr.s_addr;
1903
1904         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1905                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1906
1907         pcbporthash = &pcbinfo->ipi_porthashbase[
1908             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
1909
1910         /*
1911          * Go through port list and look for a head for this lport.
1912          */
1913         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1914                 if (phd->phd_port == inp->inp_lport)
1915                         break;
1916         }
1917         /*
1918          * If none exists, malloc one and tack it on.
1919          */
1920         if (phd == NULL) {
1921                 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1922                 if (phd == NULL) {
1923                         return (ENOBUFS); /* XXX */
1924                 }
1925                 phd->phd_port = inp->inp_lport;
1926                 LIST_INIT(&phd->phd_pcblist);
1927                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1928         }
1929         inp->inp_phd = phd;
1930         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1931         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1932         inp->inp_flags |= INP_INHASHLIST;
1933 #ifdef PCBGROUP
1934         if (do_pcbgroup_update)
1935                 in_pcbgroup_update(inp);
1936 #endif
1937         return (0);
1938 }
1939
1940 /*
1941  * For now, there are two public interfaces to insert an inpcb into the hash
1942  * lists -- one that does update pcbgroups, and one that doesn't.  The latter
1943  * is used only in the TCP syncache, where in_pcbinshash is called before the
1944  * full 4-tuple is set for the inpcb, and we don't want to install in the
1945  * pcbgroup until later.
1946  *
1947  * XXXRW: This seems like a misfeature.  in_pcbinshash should always update
1948  * connection groups, and partially initialised inpcbs should not be exposed
1949  * to either reservation hash tables or pcbgroups.
1950  */
1951 int
1952 in_pcbinshash(struct inpcb *inp)
1953 {
1954
1955         return (in_pcbinshash_internal(inp, 1));
1956 }
1957
1958 int
1959 in_pcbinshash_nopcbgroup(struct inpcb *inp)
1960 {
1961
1962         return (in_pcbinshash_internal(inp, 0));
1963 }
1964
1965 /*
1966  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1967  * changed. NOTE: This does not handle the case of the lport changing (the
1968  * hashed port list would have to be updated as well), so the lport must
1969  * not change after in_pcbinshash() has been called.
1970  */
1971 void
1972 in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m)
1973 {
1974         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1975         struct inpcbhead *head;
1976         u_int32_t hashkey_faddr;
1977
1978         INP_WLOCK_ASSERT(inp);
1979         INP_HASH_WLOCK_ASSERT(pcbinfo);
1980
1981         KASSERT(inp->inp_flags & INP_INHASHLIST,
1982             ("in_pcbrehash: !INP_INHASHLIST"));
1983
1984 #ifdef INET6
1985         if (inp->inp_vflag & INP_IPV6)
1986                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1987         else
1988 #endif
1989         hashkey_faddr = inp->inp_faddr.s_addr;
1990
1991         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1992                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1993
1994         LIST_REMOVE(inp, inp_hash);
1995         LIST_INSERT_HEAD(head, inp, inp_hash);
1996
1997 #ifdef PCBGROUP
1998         if (m != NULL)
1999                 in_pcbgroup_update_mbuf(inp, m);
2000         else
2001                 in_pcbgroup_update(inp);
2002 #endif
2003 }
2004
2005 void
2006 in_pcbrehash(struct inpcb *inp)
2007 {
2008
2009         in_pcbrehash_mbuf(inp, NULL);
2010 }
2011
2012 /*
2013  * Remove PCB from various lists.
2014  */
2015 static void
2016 in_pcbremlists(struct inpcb *inp)
2017 {
2018         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
2019
2020         INP_INFO_WLOCK_ASSERT(pcbinfo);
2021         INP_WLOCK_ASSERT(inp);
2022
2023         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
2024         if (inp->inp_flags & INP_INHASHLIST) {
2025                 struct inpcbport *phd = inp->inp_phd;
2026
2027                 INP_HASH_WLOCK(pcbinfo);
2028                 LIST_REMOVE(inp, inp_hash);
2029                 LIST_REMOVE(inp, inp_portlist);
2030                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
2031                         LIST_REMOVE(phd, phd_hash);
2032                         free(phd, M_PCB);
2033                 }
2034                 INP_HASH_WUNLOCK(pcbinfo);
2035                 inp->inp_flags &= ~INP_INHASHLIST;
2036         }
2037         LIST_REMOVE(inp, inp_list);
2038         pcbinfo->ipi_count--;
2039 #ifdef PCBGROUP
2040         in_pcbgroup_remove(inp);
2041 #endif
2042 }
2043
2044 /*
2045  * A set label operation has occurred at the socket layer, propagate the
2046  * label change into the in_pcb for the socket.
2047  */
2048 void
2049 in_pcbsosetlabel(struct socket *so)
2050 {
2051 #ifdef MAC
2052         struct inpcb *inp;
2053
2054         inp = sotoinpcb(so);
2055         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
2056
2057         INP_WLOCK(inp);
2058         SOCK_LOCK(so);
2059         mac_inpcb_sosetlabel(so, inp);
2060         SOCK_UNLOCK(so);
2061         INP_WUNLOCK(inp);
2062 #endif
2063 }
2064
2065 /*
2066  * ipport_tick runs once per second, determining if random port allocation
2067  * should be continued.  If more than ipport_randomcps ports have been
2068  * allocated in the last second, then we return to sequential port
2069  * allocation. We return to random allocation only once we drop below
2070  * ipport_randomcps for at least ipport_randomtime seconds.
2071  */
2072 static void
2073 ipport_tick(void *xtp)
2074 {
2075         VNET_ITERATOR_DECL(vnet_iter);
2076
2077         VNET_LIST_RLOCK_NOSLEEP();
2078         VNET_FOREACH(vnet_iter) {
2079                 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
2080                 if (V_ipport_tcpallocs <=
2081                     V_ipport_tcplastcount + V_ipport_randomcps) {
2082                         if (V_ipport_stoprandom > 0)
2083                                 V_ipport_stoprandom--;
2084                 } else
2085                         V_ipport_stoprandom = V_ipport_randomtime;
2086                 V_ipport_tcplastcount = V_ipport_tcpallocs;
2087                 CURVNET_RESTORE();
2088         }
2089         VNET_LIST_RUNLOCK_NOSLEEP();
2090         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
2091 }
2092
2093 static void
2094 ip_fini(void *xtp)
2095 {
2096
2097         callout_stop(&ipport_tick_callout);
2098 }
2099
2100 /*
2101  * The ipport_callout should start running at about the time we attach the
2102  * inet or inet6 domains.
2103  */
2104 static void
2105 ipport_tick_init(const void *unused __unused)
2106 {
2107
2108         /* Start ipport_tick. */
2109         callout_init(&ipport_tick_callout, CALLOUT_MPSAFE);
2110         callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL);
2111         EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL,
2112                 SHUTDOWN_PRI_DEFAULT);
2113 }
2114 SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
2115     ipport_tick_init, NULL);
2116
2117 void
2118 inp_wlock(struct inpcb *inp)
2119 {
2120
2121         INP_WLOCK(inp);
2122 }
2123
2124 void
2125 inp_wunlock(struct inpcb *inp)
2126 {
2127
2128         INP_WUNLOCK(inp);
2129 }
2130
2131 void
2132 inp_rlock(struct inpcb *inp)
2133 {
2134
2135         INP_RLOCK(inp);
2136 }
2137
2138 void
2139 inp_runlock(struct inpcb *inp)
2140 {
2141
2142         INP_RUNLOCK(inp);
2143 }
2144
2145 #ifdef INVARIANTS
2146 void
2147 inp_lock_assert(struct inpcb *inp)
2148 {
2149
2150         INP_WLOCK_ASSERT(inp);
2151 }
2152
2153 void
2154 inp_unlock_assert(struct inpcb *inp)
2155 {
2156
2157         INP_UNLOCK_ASSERT(inp);
2158 }
2159 #endif
2160
2161 void
2162 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
2163 {
2164         struct inpcb *inp;
2165
2166         INP_INFO_RLOCK(&V_tcbinfo);
2167         LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
2168                 INP_WLOCK(inp);
2169                 func(inp, arg);
2170                 INP_WUNLOCK(inp);
2171         }
2172         INP_INFO_RUNLOCK(&V_tcbinfo);
2173 }
2174
2175 struct socket *
2176 inp_inpcbtosocket(struct inpcb *inp)
2177 {
2178
2179         INP_WLOCK_ASSERT(inp);
2180         return (inp->inp_socket);
2181 }
2182
2183 struct tcpcb *
2184 inp_inpcbtotcpcb(struct inpcb *inp)
2185 {
2186
2187         INP_WLOCK_ASSERT(inp);
2188         return ((struct tcpcb *)inp->inp_ppcb);
2189 }
2190
2191 int
2192 inp_ip_tos_get(const struct inpcb *inp)
2193 {
2194
2195         return (inp->inp_ip_tos);
2196 }
2197
2198 void
2199 inp_ip_tos_set(struct inpcb *inp, int val)
2200 {
2201
2202         inp->inp_ip_tos = val;
2203 }
2204
2205 void
2206 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
2207     uint32_t *faddr, uint16_t *fp)
2208 {
2209
2210         INP_LOCK_ASSERT(inp);
2211         *laddr = inp->inp_laddr.s_addr;
2212         *faddr = inp->inp_faddr.s_addr;
2213         *lp = inp->inp_lport;
2214         *fp = inp->inp_fport;
2215 }
2216
2217 struct inpcb *
2218 so_sotoinpcb(struct socket *so)
2219 {
2220
2221         return (sotoinpcb(so));
2222 }
2223
2224 struct tcpcb *
2225 so_sototcpcb(struct socket *so)
2226 {
2227
2228         return (sototcpcb(so));
2229 }
2230
2231 #ifdef DDB
2232 static void
2233 db_print_indent(int indent)
2234 {
2235         int i;
2236
2237         for (i = 0; i < indent; i++)
2238                 db_printf(" ");
2239 }
2240
2241 static void
2242 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
2243 {
2244         char faddr_str[48], laddr_str[48];
2245
2246         db_print_indent(indent);
2247         db_printf("%s at %p\n", name, inc);
2248
2249         indent += 2;
2250
2251 #ifdef INET6
2252         if (inc->inc_flags & INC_ISIPV6) {
2253                 /* IPv6. */
2254                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
2255                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
2256         } else
2257 #endif
2258         {
2259                 /* IPv4. */
2260                 inet_ntoa_r(inc->inc_laddr, laddr_str);
2261                 inet_ntoa_r(inc->inc_faddr, faddr_str);
2262         }
2263         db_print_indent(indent);
2264         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
2265             ntohs(inc->inc_lport));
2266         db_print_indent(indent);
2267         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
2268             ntohs(inc->inc_fport));
2269 }
2270
2271 static void
2272 db_print_inpflags(int inp_flags)
2273 {
2274         int comma;
2275
2276         comma = 0;
2277         if (inp_flags & INP_RECVOPTS) {
2278                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
2279                 comma = 1;
2280         }
2281         if (inp_flags & INP_RECVRETOPTS) {
2282                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
2283                 comma = 1;
2284         }
2285         if (inp_flags & INP_RECVDSTADDR) {
2286                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
2287                 comma = 1;
2288         }
2289         if (inp_flags & INP_HDRINCL) {
2290                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
2291                 comma = 1;
2292         }
2293         if (inp_flags & INP_HIGHPORT) {
2294                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
2295                 comma = 1;
2296         }
2297         if (inp_flags & INP_LOWPORT) {
2298                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
2299                 comma = 1;
2300         }
2301         if (inp_flags & INP_ANONPORT) {
2302                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
2303                 comma = 1;
2304         }
2305         if (inp_flags & INP_RECVIF) {
2306                 db_printf("%sINP_RECVIF", comma ? ", " : "");
2307                 comma = 1;
2308         }
2309         if (inp_flags & INP_MTUDISC) {
2310                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
2311                 comma = 1;
2312         }
2313         if (inp_flags & INP_FAITH) {
2314                 db_printf("%sINP_FAITH", comma ? ", " : "");
2315                 comma = 1;
2316         }
2317         if (inp_flags & INP_RECVTTL) {
2318                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
2319                 comma = 1;
2320         }
2321         if (inp_flags & INP_DONTFRAG) {
2322                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
2323                 comma = 1;
2324         }
2325         if (inp_flags & INP_RECVTOS) {
2326                 db_printf("%sINP_RECVTOS", comma ? ", " : "");
2327                 comma = 1;
2328         }
2329         if (inp_flags & IN6P_IPV6_V6ONLY) {
2330                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
2331                 comma = 1;
2332         }
2333         if (inp_flags & IN6P_PKTINFO) {
2334                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
2335                 comma = 1;
2336         }
2337         if (inp_flags & IN6P_HOPLIMIT) {
2338                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
2339                 comma = 1;
2340         }
2341         if (inp_flags & IN6P_HOPOPTS) {
2342                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
2343                 comma = 1;
2344         }
2345         if (inp_flags & IN6P_DSTOPTS) {
2346                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
2347                 comma = 1;
2348         }
2349         if (inp_flags & IN6P_RTHDR) {
2350                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
2351                 comma = 1;
2352         }
2353         if (inp_flags & IN6P_RTHDRDSTOPTS) {
2354                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
2355                 comma = 1;
2356         }
2357         if (inp_flags & IN6P_TCLASS) {
2358                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
2359                 comma = 1;
2360         }
2361         if (inp_flags & IN6P_AUTOFLOWLABEL) {
2362                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
2363                 comma = 1;
2364         }
2365         if (inp_flags & INP_TIMEWAIT) {
2366                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
2367                 comma  = 1;
2368         }
2369         if (inp_flags & INP_ONESBCAST) {
2370                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
2371                 comma  = 1;
2372         }
2373         if (inp_flags & INP_DROPPED) {
2374                 db_printf("%sINP_DROPPED", comma ? ", " : "");
2375                 comma  = 1;
2376         }
2377         if (inp_flags & INP_SOCKREF) {
2378                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
2379                 comma  = 1;
2380         }
2381         if (inp_flags & IN6P_RFC2292) {
2382                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
2383                 comma = 1;
2384         }
2385         if (inp_flags & IN6P_MTU) {
2386                 db_printf("IN6P_MTU%s", comma ? ", " : "");
2387                 comma = 1;
2388         }
2389 }
2390
2391 static void
2392 db_print_inpvflag(u_char inp_vflag)
2393 {
2394         int comma;
2395
2396         comma = 0;
2397         if (inp_vflag & INP_IPV4) {
2398                 db_printf("%sINP_IPV4", comma ? ", " : "");
2399                 comma  = 1;
2400         }
2401         if (inp_vflag & INP_IPV6) {
2402                 db_printf("%sINP_IPV6", comma ? ", " : "");
2403                 comma  = 1;
2404         }
2405         if (inp_vflag & INP_IPV6PROTO) {
2406                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
2407                 comma  = 1;
2408         }
2409 }
2410
2411 static void
2412 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
2413 {
2414
2415         db_print_indent(indent);
2416         db_printf("%s at %p\n", name, inp);
2417
2418         indent += 2;
2419
2420         db_print_indent(indent);
2421         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
2422
2423         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
2424
2425         db_print_indent(indent);
2426         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
2427             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
2428
2429         db_print_indent(indent);
2430         db_printf("inp_label: %p   inp_flags: 0x%x (",
2431            inp->inp_label, inp->inp_flags);
2432         db_print_inpflags(inp->inp_flags);
2433         db_printf(")\n");
2434
2435         db_print_indent(indent);
2436         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
2437             inp->inp_vflag);
2438         db_print_inpvflag(inp->inp_vflag);
2439         db_printf(")\n");
2440
2441         db_print_indent(indent);
2442         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
2443             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
2444
2445         db_print_indent(indent);
2446 #ifdef INET6
2447         if (inp->inp_vflag & INP_IPV6) {
2448                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
2449                     "in6p_moptions: %p\n", inp->in6p_options,
2450                     inp->in6p_outputopts, inp->in6p_moptions);
2451                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
2452                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
2453                     inp->in6p_hops);
2454         } else
2455 #endif
2456         {
2457                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
2458                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
2459                     inp->inp_options, inp->inp_moptions);
2460         }
2461
2462         db_print_indent(indent);
2463         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
2464             (uintmax_t)inp->inp_gencnt);
2465 }
2466
2467 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
2468 {
2469         struct inpcb *inp;
2470
2471         if (!have_addr) {
2472                 db_printf("usage: show inpcb <addr>\n");
2473                 return;
2474         }
2475         inp = (struct inpcb *)addr;
2476
2477         db_print_inpcb(inp, "inpcb", 0);
2478 }
2479 #endif /* DDB */