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_var.h>
  71 #include <net/if_types.h>
  72 #include <net/route.h>
  73 #include <net/vnet.h>
  74
  75 #if defined(INET) || defined(INET6)
  76 #include <netinet/in.h>
  77 #include <netinet/in_pcb.h>
  78 #include <netinet/ip_var.h>
  79 #include <netinet/tcp_var.h>
  80 #include <netinet/udp.h>
  81 #include <netinet/udp_var.h>
  82 #endif
  83 #ifdef INET
  84 #include <netinet/in_var.h>
  85 #endif
  86 #ifdef INET6
  87 #include <netinet/ip6.h>
  88 #include <netinet6/in6_pcb.h>
  89 #include <netinet6/in6_var.h>
  90 #include <netinet6/ip6_var.h>
  91 #endif /* INET6 */
  92
  93
  94 #ifdef IPSEC
  95 #include <netipsec/ipsec.h>
  96 #include <netipsec/key.h>
  97 #endif /* IPSEC */
  98
  99 #include <security/mac/mac_framework.h>
 100
 101 static struct callout   ipport_tick_callout;
 102
 103 /*
 104  * These configure the range of local port addresses assigned to
 105  * "unspecified" outgoing connections/packets/whatever.
 106  */
 107 VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1;    /* 1023 */
 108 VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART;    /* 600 */
 109 VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST;     /* 10000 */
 110 VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST;       /* 65535 */
 111 VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO;      /* 49152 */
 112 VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO;        /* 65535 */
 113
 114 /*
 115  * Reserved ports accessible only to root. There are significant
 116  * security considerations that must be accounted for when changing these,
 117  * but the security benefits can be great. Please be careful.
 118  */
 119 VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1;    /* 1023 */
 120 VNET_DEFINE(int, ipport_reservedlow);
 121
 122 /* Variables dealing with random ephemeral port allocation. */
 123 VNET_DEFINE(int, ipport_randomized) = 1;        /* user controlled via sysctl */
 124 VNET_DEFINE(int, ipport_randomcps) = 10;        /* user controlled via sysctl */
 125 VNET_DEFINE(int, ipport_randomtime) = 45;       /* user controlled via sysctl */
 126 VNET_DEFINE(int, ipport_stoprandom);            /* toggled by ipport_tick */
 127 VNET_DEFINE(int, ipport_tcpallocs);
 128 static VNET_DEFINE(int, ipport_tcplastcount);
 129
 130 #define V_ipport_tcplastcount           VNET(ipport_tcplastcount)
 131
 132 static void     in_pcbremlists(struct inpcb *inp);
 133 #ifdef INET
 134 static struct inpcb     *in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo,
 135                             struct in_addr faddr, u_int fport_arg,
 136                             struct in_addr laddr, u_int lport_arg,
 137                             int lookupflags, struct ifnet *ifp);
 138
 139 #define RANGECHK(var, min, max) \
 140         if ((var) < (min)) { (var) = (min); } \
 141         else if ((var) > (max)) { (var) = (max); }
 142
 143 static int
 144 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 145 {
 146         int error;
 147
 148 #ifdef VIMAGE
 149         error = vnet_sysctl_handle_int(oidp, arg1, arg2, req);
 150 #else
 151         error = sysctl_handle_int(oidp, arg1, arg2, req);
 152 #endif
 153         if (error == 0) {
 154                 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 155                 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 156                 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
 157                 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
 158                 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
 159                 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
 160         }
 161         return (error);
 162 }
 163
 164 #undef RANGECHK
 165
 166 static SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0,
 167     "IP Ports");
 168
 169 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst,
 170         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowfirstauto), 0,
 171         &sysctl_net_ipport_check, "I", "");
 172 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast,
 173         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowlastauto), 0,
 174         &sysctl_net_ipport_check, "I", "");
 175 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, first,
 176         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_firstauto), 0,
 177         &sysctl_net_ipport_check, "I", "");
 178 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, last,
 179         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lastauto), 0,
 180         &sysctl_net_ipport_check, "I", "");
 181 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst,
 182         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hifirstauto), 0,
 183         &sysctl_net_ipport_check, "I", "");
 184 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hilast,
 185         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hilastauto), 0,
 186         &sysctl_net_ipport_check, "I", "");
 187 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
 188         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedhigh), 0, "");
 189 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
 190         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, "");
 191 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
 192         &VNET_NAME(ipport_randomized), 0, "Enable random port allocation");
 193 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
 194         &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port "
 195         "allocations before switching to a sequental one");
 196 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
 197         &VNET_NAME(ipport_randomtime), 0,
 198         "Minimum time to keep sequental port "
 199         "allocation before switching to a random one");
 200 #endif /* INET */
 201
 202 /*
 203  * in_pcb.c: manage the Protocol Control Blocks.
 204  *
 205  * NOTE: It is assumed that most of these functions will be called with
 206  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
 207  * functions often modify hash chains or addresses in pcbs.
 208  */
 209
 210 /*
 211  * Initialize an inpcbinfo -- we should be able to reduce the number of
 212  * arguments in time.
 213  */
 214 void
 215 in_pcbinfo_init(struct inpcbinfo *pcbinfo, const char *name,
 216     struct inpcbhead *listhead, int hash_nelements, int porthash_nelements,
 217     char *inpcbzone_name, uma_init inpcbzone_init, uma_fini inpcbzone_fini,
 218     uint32_t inpcbzone_flags, u_int hashfields)
 219 {
 220
 221         INP_INFO_LOCK_INIT(pcbinfo, name);
 222         INP_HASH_LOCK_INIT(pcbinfo, "pcbinfohash");     /* XXXRW: argument? */
 223 #ifdef VIMAGE
 224         pcbinfo->ipi_vnet = curvnet;
 225 #endif
 226         pcbinfo->ipi_listhead = listhead;
 227         LIST_INIT(pcbinfo->ipi_listhead);
 228         pcbinfo->ipi_count = 0;
 229         pcbinfo->ipi_hashbase = hashinit(hash_nelements, M_PCB,
 230             &pcbinfo->ipi_hashmask);
 231         pcbinfo->ipi_porthashbase = hashinit(porthash_nelements, M_PCB,
 232             &pcbinfo->ipi_porthashmask);
 233 #ifdef PCBGROUP
 234         in_pcbgroup_init(pcbinfo, hashfields, hash_nelements);
 235 #endif
 236         pcbinfo->ipi_zone = uma_zcreate(inpcbzone_name, sizeof(struct inpcb),
 237             NULL, NULL, inpcbzone_init, inpcbzone_fini, UMA_ALIGN_PTR,
 238             inpcbzone_flags);
 239         uma_zone_set_max(pcbinfo->ipi_zone, maxsockets);
 240         uma_zone_set_warning(pcbinfo->ipi_zone,
 241             "kern.ipc.maxsockets limit reached");
 242 }
 243
 244 /*
 245  * Destroy an inpcbinfo.
 246  */
 247 void
 248 in_pcbinfo_destroy(struct inpcbinfo *pcbinfo)
 249 {
 250
 251         KASSERT(pcbinfo->ipi_count == 0,
 252             ("%s: ipi_count = %u", __func__, pcbinfo->ipi_count));
 253
 254         hashdestroy(pcbinfo->ipi_hashbase, M_PCB, pcbinfo->ipi_hashmask);
 255         hashdestroy(pcbinfo->ipi_porthashbase, M_PCB,
 256             pcbinfo->ipi_porthashmask);
 257 #ifdef PCBGROUP
 258         in_pcbgroup_destroy(pcbinfo);
 259 #endif
 260         uma_zdestroy(pcbinfo->ipi_zone);
 261         INP_HASH_LOCK_DESTROY(pcbinfo);
 262         INP_INFO_LOCK_DESTROY(pcbinfo);
 263 }
 264
 265 /*
 266  * Allocate a PCB and associate it with the socket.
 267  * On success return with the PCB locked.
 268  */
 269 int
 270 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 271 {
 272         struct inpcb *inp;
 273         int error;
 274
 275         INP_INFO_WLOCK_ASSERT(pcbinfo);
 276         error = 0;
 277         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
 278         if (inp == NULL)
 279                 return (ENOBUFS);
 280         bzero(inp, inp_zero_size);
 281         inp->inp_pcbinfo = pcbinfo;
 282         inp->inp_socket = so;
 283         inp->inp_cred = crhold(so->so_cred);
 284         inp->inp_inc.inc_fibnum = so->so_fibnum;
 285 #ifdef MAC
 286         error = mac_inpcb_init(inp, M_NOWAIT);
 287         if (error != 0)
 288                 goto out;
 289         mac_inpcb_create(so, inp);
 290 #endif
 291 #ifdef IPSEC
 292         error = ipsec_init_policy(so, &inp->inp_sp);
 293         if (error != 0) {
 294 #ifdef MAC
 295                 mac_inpcb_destroy(inp);
 296 #endif
 297                 goto out;
 298         }
 299 #endif /*IPSEC*/
 300 #ifdef INET6
 301         if (INP_SOCKAF(so) == AF_INET6) {
 302                 inp->inp_vflag |= INP_IPV6PROTO;
 303                 if (V_ip6_v6only)
 304                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 305         }
 306 #endif
 307         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
 308         pcbinfo->ipi_count++;
 309         so->so_pcb = (caddr_t)inp;
 310 #ifdef INET6
 311         if (V_ip6_auto_flowlabel)
 312                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 313 #endif
 314         INP_WLOCK(inp);
 315         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 316         refcount_init(&inp->inp_refcount, 1);   /* Reference from inpcbinfo */
 317 #if defined(IPSEC) || defined(MAC)
 318 out:
 319         if (error != 0) {
 320                 crfree(inp->inp_cred);
 321                 uma_zfree(pcbinfo->ipi_zone, inp);
 322         }
 323 #endif
 324         return (error);
 325 }
 326
 327 #ifdef INET
 328 int
 329 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 330 {
 331         int anonport, error;
 332
 333         INP_WLOCK_ASSERT(inp);
 334         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 335
 336         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 337                 return (EINVAL);
 338         anonport = nam == NULL || ((struct sockaddr_in *)nam)->sin_port == 0;
 339         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 340             &inp->inp_lport, cred);
 341         if (error)
 342                 return (error);
 343         if (in_pcbinshash(inp) != 0) {
 344                 inp->inp_laddr.s_addr = INADDR_ANY;
 345                 inp->inp_lport = 0;
 346                 return (EAGAIN);
 347         }
 348         if (anonport)
 349                 inp->inp_flags |= INP_ANONPORT;
 350         return (0);
 351 }
 352 #endif
 353
 354 #if defined(INET) || defined(INET6)
 355 int
 356 in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp,
 357     struct ucred *cred, int lookupflags)
 358 {
 359         struct inpcbinfo *pcbinfo;
 360         struct inpcb *tmpinp;
 361         unsigned short *lastport;
 362         int count, dorandom, error;
 363         u_short aux, first, last, lport;
 364 #ifdef INET
 365         struct in_addr laddr;
 366 #endif
 367
 368         pcbinfo = inp->inp_pcbinfo;
 369
 370         /*
 371          * Because no actual state changes occur here, a global write lock on
 372          * the pcbinfo isn't required.
 373          */
 374         INP_LOCK_ASSERT(inp);
 375         INP_HASH_LOCK_ASSERT(pcbinfo);
 376
 377         if (inp->inp_flags & INP_HIGHPORT) {
 378                 first = V_ipport_hifirstauto;   /* sysctl */
 379                 last  = V_ipport_hilastauto;
 380                 lastport = &pcbinfo->ipi_lasthi;
 381         } else if (inp->inp_flags & INP_LOWPORT) {
 382                 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
 383                 if (error)
 384                         return (error);
 385                 first = V_ipport_lowfirstauto;  /* 1023 */
 386                 last  = V_ipport_lowlastauto;   /* 600 */
 387                 lastport = &pcbinfo->ipi_lastlow;
 388         } else {
 389                 first = V_ipport_firstauto;     /* sysctl */
 390                 last  = V_ipport_lastauto;
 391                 lastport = &pcbinfo->ipi_lastport;
 392         }
 393         /*
 394          * For UDP, use random port allocation as long as the user
 395          * allows it.  For TCP (and as of yet unknown) connections,
 396          * use random port allocation only if the user allows it AND
 397          * ipport_tick() allows it.
 398          */
 399         if (V_ipport_randomized &&
 400                 (!V_ipport_stoprandom || pcbinfo == &V_udbinfo))
 401                 dorandom = 1;
 402         else
 403                 dorandom = 0;
 404         /*
 405          * It makes no sense to do random port allocation if
 406          * we have the only port available.
 407          */
 408         if (first == last)
 409                 dorandom = 0;
 410         /* Make sure to not include UDP packets in the count. */
 411         if (pcbinfo != &V_udbinfo)
 412                 V_ipport_tcpallocs++;
 413         /*
 414          * Instead of having two loops further down counting up or down
 415          * make sure that first is always <= last and go with only one
 416          * code path implementing all logic.
 417          */
 418         if (first > last) {
 419                 aux = first;
 420                 first = last;
 421                 last = aux;
 422         }
 423
 424 #ifdef INET
 425         /* Make the compiler happy. */
 426         laddr.s_addr = 0;
 427         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) {
 428                 KASSERT(laddrp != NULL, ("%s: laddrp NULL for v4 inp %p",
 429                     __func__, inp));
 430                 laddr = *laddrp;
 431         }
 432 #endif
 433         tmpinp = NULL;  /* Make compiler happy. */
 434         lport = *lportp;
 435
 436         if (dorandom)
 437                 *lastport = first + (arc4random() % (last - first));
 438
 439         count = last - first;
 440
 441         do {
 442                 if (count-- < 0)        /* completely used? */
 443                         return (EADDRNOTAVAIL);
 444                 ++*lastport;
 445                 if (*lastport < first || *lastport > last)
 446                         *lastport = first;
 447                 lport = htons(*lastport);
 448
 449 #ifdef INET6
 450                 if ((inp->inp_vflag & INP_IPV6) != 0)
 451                         tmpinp = in6_pcblookup_local(pcbinfo,
 452                             &inp->in6p_laddr, lport, lookupflags, cred);
 453 #endif
 454 #if defined(INET) && defined(INET6)
 455                 else
 456 #endif
 457 #ifdef INET
 458                         tmpinp = in_pcblookup_local(pcbinfo, laddr,
 459                             lport, lookupflags, cred);
 460 #endif
 461         } while (tmpinp != NULL);
 462
 463 #ifdef INET
 464         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4)
 465                 laddrp->s_addr = laddr.s_addr;
 466 #endif
 467         *lportp = lport;
 468
 469         return (0);
 470 }
 471
 472 /*
 473  * Return cached socket options.
 474  */
 475 short
 476 inp_so_options(const struct inpcb *inp)
 477 {
 478    short so_options;
 479
 480    so_options = 0;
 481
 482    if ((inp->inp_flags2 & INP_REUSEPORT) != 0)
 483            so_options |= SO_REUSEPORT;
 484    if ((inp->inp_flags2 & INP_REUSEADDR) != 0)
 485            so_options |= SO_REUSEADDR;
 486    return (so_options);
 487 }
 488 #endif /* INET || INET6 */
 489
 490 #ifdef INET
 491 /*
 492  * Set up a bind operation on a PCB, performing port allocation
 493  * as required, but do not actually modify the PCB. Callers can
 494  * either complete the bind by setting inp_laddr/inp_lport and
 495  * calling in_pcbinshash(), or they can just use the resulting
 496  * port and address to authorise the sending of a once-off packet.
 497  *
 498  * On error, the values of *laddrp and *lportp are not changed.
 499  */
 500 int
 501 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 502     u_short *lportp, struct ucred *cred)
 503 {
 504         struct socket *so = inp->inp_socket;
 505         struct sockaddr_in *sin;
 506         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 507         struct in_addr laddr;
 508         u_short lport = 0;
 509         int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT);
 510         int error;
 511
 512         /*
 513          * No state changes, so read locks are sufficient here.
 514          */
 515         INP_LOCK_ASSERT(inp);
 516         INP_HASH_LOCK_ASSERT(pcbinfo);
 517
 518         if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
 519                 return (EADDRNOTAVAIL);
 520         laddr.s_addr = *laddrp;
 521         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 522                 return (EINVAL);
 523         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 524                 lookupflags = INPLOOKUP_WILDCARD;
 525         if (nam == NULL) {
 526                 if ((error = prison_local_ip4(cred, &laddr)) != 0)
 527                         return (error);
 528         } else {
 529                 sin = (struct sockaddr_in *)nam;
 530                 if (nam->sa_len != sizeof (*sin))
 531                         return (EINVAL);
 532 #ifdef notdef
 533                 /*
 534                  * We should check the family, but old programs
 535                  * incorrectly fail to initialize it.
 536                  */
 537                 if (sin->sin_family != AF_INET)
 538                         return (EAFNOSUPPORT);
 539 #endif
 540                 error = prison_local_ip4(cred, &sin->sin_addr);
 541                 if (error)
 542                         return (error);
 543                 if (sin->sin_port != *lportp) {
 544                         /* Don't allow the port to change. */
 545                         if (*lportp != 0)
 546                                 return (EINVAL);
 547                         lport = sin->sin_port;
 548                 }
 549                 /* NB: lport is left as 0 if the port isn't being changed. */
 550                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 551                         /*
 552                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 553                          * allow complete duplication of binding if
 554                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 555                          * and a multicast address is bound on both
 556                          * new and duplicated sockets.
 557                          */
 558                         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
 559                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 560                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 561                         sin->sin_port = 0;              /* yech... */
 562                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 563                         /*
 564                          * Is the address a local IP address?
 565                          * If INP_BINDANY is set, then the socket may be bound
 566                          * to any endpoint address, local or not.
 567                          */
 568                         if ((inp->inp_flags & INP_BINDANY) == 0 &&
 569                             ifa_ifwithaddr_check((struct sockaddr *)sin) == 0)
 570                                 return (EADDRNOTAVAIL);
 571                 }
 572                 laddr = sin->sin_addr;
 573                 if (lport) {
 574                         struct inpcb *t;
 575                         struct tcptw *tw;
 576
 577                         /* GROSS */
 578                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 579                             ntohs(lport) >= V_ipport_reservedlow &&
 580                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 581                             0))
 582                                 return (EACCES);
 583                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 584                             priv_check_cred(inp->inp_cred,
 585                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 586                                 t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 587                                     lport, INPLOOKUP_WILDCARD, cred);
 588         /*
 589          * XXX
 590          * This entire block sorely needs a rewrite.
 591          */
 592                                 if (t &&
 593                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 594                                     (so->so_type != SOCK_STREAM ||
 595                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
 596                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
 597                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 598                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
 599                                     (inp->inp_cred->cr_uid !=
 600                                      t->inp_cred->cr_uid))
 601                                         return (EADDRINUSE);
 602                         }
 603                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 604                             lport, lookupflags, cred);
 605                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 606                                 /*
 607                                  * XXXRW: If an incpb has had its timewait
 608                                  * state recycled, we treat the address as
 609                                  * being in use (for now).  This is better
 610                                  * than a panic, but not desirable.
 611                                  */
 612                                 tw = intotw(t);
 613                                 if (tw == NULL ||
 614                                     (reuseport & tw->tw_so_options) == 0)
 615                                         return (EADDRINUSE);
 616                         } else if (t && (reuseport & inp_so_options(t)) == 0) {
 617 #ifdef INET6
 618                                 if (ntohl(sin->sin_addr.s_addr) !=
 619                                     INADDR_ANY ||
 620                                     ntohl(t->inp_laddr.s_addr) !=
 621                                     INADDR_ANY ||
 622                                     (inp->inp_vflag & INP_IPV6PROTO) == 0 ||
 623                                     (t->inp_vflag & INP_IPV6PROTO) == 0)
 624 #endif
 625                                 return (EADDRINUSE);
 626                         }
 627                 }
 628         }
 629         if (*lportp != 0)
 630                 lport = *lportp;
 631         if (lport == 0) {
 632                 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags);
 633                 if (error != 0)
 634                         return (error);
 635
 636         }
 637         *laddrp = laddr.s_addr;
 638         *lportp = lport;
 639         return (0);
 640 }
 641
 642 /*
 643  * Connect from a socket to a specified address.
 644  * Both address and port must be specified in argument sin.
 645  * If don't have a local address for this socket yet,
 646  * then pick one.
 647  */
 648 int
 649 in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
 650     struct ucred *cred, struct mbuf *m)
 651 {
 652         u_short lport, fport;
 653         in_addr_t laddr, faddr;
 654         int anonport, error;
 655
 656         INP_WLOCK_ASSERT(inp);
 657         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 658
 659         lport = inp->inp_lport;
 660         laddr = inp->inp_laddr.s_addr;
 661         anonport = (lport == 0);
 662         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 663             NULL, cred);
 664         if (error)
 665                 return (error);
 666
 667         /* Do the initial binding of the local address if required. */
 668         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 669                 inp->inp_lport = lport;
 670                 inp->inp_laddr.s_addr = laddr;
 671                 if (in_pcbinshash(inp) != 0) {
 672                         inp->inp_laddr.s_addr = INADDR_ANY;
 673                         inp->inp_lport = 0;
 674                         return (EAGAIN);
 675                 }
 676         }
 677
 678         /* Commit the remaining changes. */
 679         inp->inp_lport = lport;
 680         inp->inp_laddr.s_addr = laddr;
 681         inp->inp_faddr.s_addr = faddr;
 682         inp->inp_fport = fport;
 683         in_pcbrehash_mbuf(inp, m);
 684
 685         if (anonport)
 686                 inp->inp_flags |= INP_ANONPORT;
 687         return (0);
 688 }
 689
 690 int
 691 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 692 {
 693
 694         return (in_pcbconnect_mbuf(inp, nam, cred, NULL));
 695 }
 696
 697 /*
 698  * Do proper source address selection on an unbound socket in case
 699  * of connect. Take jails into account as well.
 700  */
 701 static int
 702 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
 703     struct ucred *cred)
 704 {
 705         struct ifaddr *ifa;
 706         struct sockaddr *sa;
 707         struct sockaddr_in *sin;
 708         struct route sro;
 709         int error;
 710
 711         KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
 712
 713         /*
 714          * Bypass source address selection and use the primary jail IP
 715          * if requested.
 716          */
 717         if (cred != NULL && !prison_saddrsel_ip4(cred, laddr))
 718                 return (0);
 719
 720         error = 0;
 721         bzero(&sro, sizeof(sro));
 722
 723         sin = (struct sockaddr_in *)&sro.ro_dst;
 724         sin->sin_family = AF_INET;
 725         sin->sin_len = sizeof(struct sockaddr_in);
 726         sin->sin_addr.s_addr = faddr->s_addr;
 727
 728         /*
 729          * If route is known our src addr is taken from the i/f,
 730          * else punt.
 731          *
 732          * Find out route to destination.
 733          */
 734         if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 735                 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
 736
 737         /*
 738          * If we found a route, use the address corresponding to
 739          * the outgoing interface.
 740          *
 741          * Otherwise assume faddr is reachable on a directly connected
 742          * network and try to find a corresponding interface to take
 743          * the source address from.
 744          */
 745         if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
 746                 struct in_ifaddr *ia;
 747                 struct ifnet *ifp;
 748
 749                 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin));
 750                 if (ia == NULL)
 751                         ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0));
 752                 if (ia == NULL) {
 753                         error = ENETUNREACH;
 754                         goto done;
 755                 }
 756
 757                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 758                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 759                         ifa_free(&ia->ia_ifa);
 760                         goto done;
 761                 }
 762
 763                 ifp = ia->ia_ifp;
 764                 ifa_free(&ia->ia_ifa);
 765                 ia = NULL;
 766                 IF_ADDR_RLOCK(ifp);
 767                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 768
 769                         sa = ifa->ifa_addr;
 770                         if (sa->sa_family != AF_INET)
 771                                 continue;
 772                         sin = (struct sockaddr_in *)sa;
 773                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 774                                 ia = (struct in_ifaddr *)ifa;
 775                                 break;
 776                         }
 777                 }
 778                 if (ia != NULL) {
 779                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 780                         IF_ADDR_RUNLOCK(ifp);
 781                         goto done;
 782                 }
 783                 IF_ADDR_RUNLOCK(ifp);
 784
 785                 /* 3. As a last resort return the 'default' jail address. */
 786                 error = prison_get_ip4(cred, laddr);
 787                 goto done;
 788         }
 789
 790         /*
 791          * If the outgoing interface on the route found is not
 792          * a loopback interface, use the address from that interface.
 793          * In case of jails do those three steps:
 794          * 1. check if the interface address belongs to the jail. If so use it.
 795          * 2. check if we have any address on the outgoing interface
 796          *    belonging to this jail. If so use it.
 797          * 3. as a last resort return the 'default' jail address.
 798          */
 799         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
 800                 struct in_ifaddr *ia;
 801                 struct ifnet *ifp;
 802
 803                 /* If not jailed, use the default returned. */
 804                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 805                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 806                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 807                         goto done;
 808                 }
 809
 810                 /* Jailed. */
 811                 /* 1. Check if the iface address belongs to the jail. */
 812                 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
 813                 if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 814                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 815                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 816                         goto done;
 817                 }
 818
 819                 /*
 820                  * 2. Check if we have any address on the outgoing interface
 821                  *    belonging to this jail.
 822                  */
 823                 ia = NULL;
 824                 ifp = sro.ro_rt->rt_ifp;
 825                 IF_ADDR_RLOCK(ifp);
 826                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 827                         sa = ifa->ifa_addr;
 828                         if (sa->sa_family != AF_INET)
 829                                 continue;
 830                         sin = (struct sockaddr_in *)sa;
 831                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 832                                 ia = (struct in_ifaddr *)ifa;
 833                                 break;
 834                         }
 835                 }
 836                 if (ia != NULL) {
 837                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 838                         IF_ADDR_RUNLOCK(ifp);
 839                         goto done;
 840                 }
 841                 IF_ADDR_RUNLOCK(ifp);
 842
 843                 /* 3. As a last resort return the 'default' jail address. */
 844                 error = prison_get_ip4(cred, laddr);
 845                 goto done;
 846         }
 847
 848         /*
 849          * The outgoing interface is marked with 'loopback net', so a route
 850          * to ourselves is here.
 851          * Try to find the interface of the destination address and then
 852          * take the address from there. That interface is not necessarily
 853          * a loopback interface.
 854          * In case of jails, check that it is an address of the jail
 855          * and if we cannot find, fall back to the 'default' jail address.
 856          */
 857         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
 858                 struct sockaddr_in sain;
 859                 struct in_ifaddr *ia;
 860
 861                 bzero(&sain, sizeof(struct sockaddr_in));
 862                 sain.sin_family = AF_INET;
 863                 sain.sin_len = sizeof(struct sockaddr_in);
 864                 sain.sin_addr.s_addr = faddr->s_addr;
 865
 866                 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain)));
 867                 if (ia == NULL)
 868                         ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0));
 869                 if (ia == NULL)
 870                         ia = ifatoia(ifa_ifwithaddr(sintosa(&sain)));
 871
 872                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 873                         if (ia == NULL) {
 874                                 error = ENETUNREACH;
 875                                 goto done;
 876                         }
 877                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 878                         ifa_free(&ia->ia_ifa);
 879                         goto done;
 880                 }
 881
 882                 /* Jailed. */
 883                 if (ia != NULL) {
 884                         struct ifnet *ifp;
 885
 886                         ifp = ia->ia_ifp;
 887                         ifa_free(&ia->ia_ifa);
 888                         ia = NULL;
 889                         IF_ADDR_RLOCK(ifp);
 890                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 891
 892                                 sa = ifa->ifa_addr;
 893                                 if (sa->sa_family != AF_INET)
 894                                         continue;
 895                                 sin = (struct sockaddr_in *)sa;
 896                                 if (prison_check_ip4(cred,
 897                                     &sin->sin_addr) == 0) {
 898                                         ia = (struct in_ifaddr *)ifa;
 899                                         break;
 900                                 }
 901                         }
 902                         if (ia != NULL) {
 903                                 laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 904                                 IF_ADDR_RUNLOCK(ifp);
 905                                 goto done;
 906                         }
 907                         IF_ADDR_RUNLOCK(ifp);
 908                 }
 909
 910                 /* 3. As a last resort return the 'default' jail address. */
 911                 error = prison_get_ip4(cred, laddr);
 912                 goto done;
 913         }
 914
 915 done:
 916         if (sro.ro_rt != NULL)
 917                 RTFREE(sro.ro_rt);
 918         return (error);
 919 }
 920
 921 /*
 922  * Set up for a connect from a socket to the specified address.
 923  * On entry, *laddrp and *lportp should contain the current local
 924  * address and port for the PCB; these are updated to the values
 925  * that should be placed in inp_laddr and inp_lport to complete
 926  * the connect.
 927  *
 928  * On success, *faddrp and *fportp will be set to the remote address
 929  * and port. These are not updated in the error case.
 930  *
 931  * If the operation fails because the connection already exists,
 932  * *oinpp will be set to the PCB of that connection so that the
 933  * caller can decide to override it. In all other cases, *oinpp
 934  * is set to NULL.
 935  */
 936 int
 937 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 938     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 939     struct inpcb **oinpp, struct ucred *cred)
 940 {
 941         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 942         struct in_ifaddr *ia;
 943         struct inpcb *oinp;
 944         struct in_addr laddr, faddr;
 945         u_short lport, fport;
 946         int error;
 947
 948         /*
 949          * Because a global state change doesn't actually occur here, a read
 950          * lock is sufficient.
 951          */
 952         INP_LOCK_ASSERT(inp);
 953         INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo);
 954
 955         if (oinpp != NULL)
 956                 *oinpp = NULL;
 957         if (nam->sa_len != sizeof (*sin))
 958                 return (EINVAL);
 959         if (sin->sin_family != AF_INET)
 960                 return (EAFNOSUPPORT);
 961         if (sin->sin_port == 0)
 962                 return (EADDRNOTAVAIL);
 963         laddr.s_addr = *laddrp;
 964         lport = *lportp;
 965         faddr = sin->sin_addr;
 966         fport = sin->sin_port;
 967
 968         if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
 969                 /*
 970                  * If the destination address is INADDR_ANY,
 971                  * use the primary local address.
 972                  * If the supplied address is INADDR_BROADCAST,
 973                  * and the primary interface supports broadcast,
 974                  * choose the broadcast address for that interface.
 975                  */
 976                 if (faddr.s_addr == INADDR_ANY) {
 977                         IN_IFADDR_RLOCK();
 978                         faddr =
 979                             IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
 980                         IN_IFADDR_RUNLOCK();
 981                         if (cred != NULL &&
 982                             (error = prison_get_ip4(cred, &faddr)) != 0)
 983                                 return (error);
 984                 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
 985                         IN_IFADDR_RLOCK();
 986                         if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
 987                             IFF_BROADCAST)
 988                                 faddr = satosin(&TAILQ_FIRST(
 989                                     &V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
 990                         IN_IFADDR_RUNLOCK();
 991                 }
 992         }
 993         if (laddr.s_addr == INADDR_ANY) {
 994                 error = in_pcbladdr(inp, &faddr, &laddr, cred);
 995                 /*
 996                  * If the destination address is multicast and an outgoing
 997                  * interface has been set as a multicast option, prefer the
 998                  * address of that interface as our source address.
 999                  */
1000                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
1001                     inp->inp_moptions != NULL) {
1002                         struct ip_moptions *imo;
1003                         struct ifnet *ifp;
1004
1005                         imo = inp->inp_moptions;
1006                         if (imo->imo_multicast_ifp != NULL) {
1007                                 ifp = imo->imo_multicast_ifp;
1008                                 IN_IFADDR_RLOCK();
1009                                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1010                                         if ((ia->ia_ifp == ifp) &&
1011                                             (cred == NULL ||
1012                                             prison_check_ip4(cred,
1013                                             &ia->ia_addr.sin_addr) == 0))
1014                                                 break;
1015                                 }
1016                                 if (ia == NULL)
1017                                         error = EADDRNOTAVAIL;
1018                                 else {
1019                                         laddr = ia->ia_addr.sin_addr;
1020                                         error = 0;
1021                                 }
1022                                 IN_IFADDR_RUNLOCK();
1023                         }
1024                 }
1025                 if (error)
1026                         return (error);
1027         }
1028         oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, fport,
1029             laddr, lport, 0, NULL);
1030         if (oinp != NULL) {
1031                 if (oinpp != NULL)
1032                         *oinpp = oinp;
1033                 return (EADDRINUSE);
1034         }
1035         if (lport == 0) {
1036                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
1037                     cred);
1038                 if (error)
1039                         return (error);
1040         }
1041         *laddrp = laddr.s_addr;
1042         *lportp = lport;
1043         *faddrp = faddr.s_addr;
1044         *fportp = fport;
1045         return (0);
1046 }
1047
1048 void
1049 in_pcbdisconnect(struct inpcb *inp)
1050 {
1051
1052         INP_WLOCK_ASSERT(inp);
1053         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
1054
1055         inp->inp_faddr.s_addr = INADDR_ANY;
1056         inp->inp_fport = 0;
1057         in_pcbrehash(inp);
1058 }
1059 #endif /* INET */
1060
1061 /*
1062  * in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
1063  * For most protocols, this will be invoked immediately prior to calling
1064  * in_pcbfree().  However, with TCP the inpcb may significantly outlive the
1065  * socket, in which case in_pcbfree() is deferred.
1066  */
1067 void
1068 in_pcbdetach(struct inpcb *inp)
1069 {
1070
1071         KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
1072
1073         inp->inp_socket->so_pcb = NULL;
1074         inp->inp_socket = NULL;
1075 }
1076
1077 /*
1078  * in_pcbref() bumps the reference count on an inpcb in order to maintain
1079  * stability of an inpcb pointer despite the inpcb lock being released.  This
1080  * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
1081  * but where the inpcb lock may already held, or when acquiring a reference
1082  * via a pcbgroup.
1083  *
1084  * in_pcbref() should be used only to provide brief memory stability, and
1085  * must always be followed by a call to INP_WLOCK() and in_pcbrele() to
1086  * garbage collect the inpcb if it has been in_pcbfree()'d from another
1087  * context.  Until in_pcbrele() has returned that the inpcb is still valid,
1088  * lock and rele are the *only* safe operations that may be performed on the
1089  * inpcb.
1090  *
1091  * While the inpcb will not be freed, releasing the inpcb lock means that the
1092  * connection's state may change, so the caller should be careful to
1093  * revalidate any cached state on reacquiring the lock.  Drop the reference
1094  * using in_pcbrele().
1095  */
1096 void
1097 in_pcbref(struct inpcb *inp)
1098 {
1099
1100         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1101
1102         refcount_acquire(&inp->inp_refcount);
1103 }
1104
1105 /*
1106  * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
1107  * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
1108  * return a flag indicating whether or not the inpcb remains valid.  If it is
1109  * valid, we return with the inpcb lock held.
1110  *
1111  * Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a
1112  * reference on an inpcb.  Historically more work was done here (actually, in
1113  * in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the
1114  * need for the pcbinfo lock in in_pcbrele().  Deferring the free is entirely
1115  * about memory stability (and continued use of the write lock).
1116  */
1117 int
1118 in_pcbrele_rlocked(struct inpcb *inp)
1119 {
1120         struct inpcbinfo *pcbinfo;
1121
1122         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1123
1124         INP_RLOCK_ASSERT(inp);
1125
1126         if (refcount_release(&inp->inp_refcount) == 0) {
1127                 /*
1128                  * If the inpcb has been freed, let the caller know, even if
1129                  * this isn't the last reference.
1130                  */
1131                 if (inp->inp_flags2 & INP_FREED) {
1132                         INP_RUNLOCK(inp);
1133                         return (1);
1134                 }
1135                 return (0);
1136         }
1137
1138         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1139
1140         INP_RUNLOCK(inp);
1141         pcbinfo = inp->inp_pcbinfo;
1142         uma_zfree(pcbinfo->ipi_zone, inp);
1143         return (1);
1144 }
1145
1146 int
1147 in_pcbrele_wlocked(struct inpcb *inp)
1148 {
1149         struct inpcbinfo *pcbinfo;
1150
1151         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1152
1153         INP_WLOCK_ASSERT(inp);
1154
1155         if (refcount_release(&inp->inp_refcount) == 0)
1156                 return (0);
1157
1158         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1159
1160         INP_WUNLOCK(inp);
1161         pcbinfo = inp->inp_pcbinfo;
1162         uma_zfree(pcbinfo->ipi_zone, inp);
1163         return (1);
1164 }
1165
1166 /*
1167  * Temporary wrapper.
1168  */
1169 int
1170 in_pcbrele(struct inpcb *inp)
1171 {
1172
1173         return (in_pcbrele_wlocked(inp));
1174 }
1175
1176 /*
1177  * Unconditionally schedule an inpcb to be freed by decrementing its
1178  * reference count, which should occur only after the inpcb has been detached
1179  * from its socket.  If another thread holds a temporary reference (acquired
1180  * using in_pcbref()) then the free is deferred until that reference is
1181  * released using in_pcbrele(), but the inpcb is still unlocked.  Almost all
1182  * work, including removal from global lists, is done in this context, where
1183  * the pcbinfo lock is held.
1184  */
1185 void
1186 in_pcbfree(struct inpcb *inp)
1187 {
1188         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1189
1190         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1191
1192         INP_INFO_WLOCK_ASSERT(pcbinfo);
1193         INP_WLOCK_ASSERT(inp);
1194
1195         /* XXXRW: Do as much as possible here. */
1196 #ifdef IPSEC
1197         if (inp->inp_sp != NULL)
1198                 ipsec_delete_pcbpolicy(inp);
1199 #endif
1200         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1201         in_pcbremlists(inp);
1202 #ifdef INET6
1203         if (inp->inp_vflag & INP_IPV6PROTO) {
1204                 ip6_freepcbopts(inp->in6p_outputopts);
1205                 if (inp->in6p_moptions != NULL)
1206                         ip6_freemoptions(inp->in6p_moptions);
1207         }
1208 #endif
1209         if (inp->inp_options)
1210                 (void)m_free(inp->inp_options);
1211 #ifdef INET
1212         if (inp->inp_moptions != NULL)
1213                 inp_freemoptions(inp->inp_moptions);
1214 #endif
1215         inp->inp_vflag = 0;
1216         inp->inp_flags2 |= INP_FREED;
1217         crfree(inp->inp_cred);
1218 #ifdef MAC
1219         mac_inpcb_destroy(inp);
1220 #endif
1221         if (!in_pcbrele_wlocked(inp))
1222                 INP_WUNLOCK(inp);
1223 }
1224
1225 /*
1226  * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
1227  * port reservation, and preventing it from being returned by inpcb lookups.
1228  *
1229  * It is used by TCP to mark an inpcb as unused and avoid future packet
1230  * delivery or event notification when a socket remains open but TCP has
1231  * closed.  This might occur as a result of a shutdown()-initiated TCP close
1232  * or a RST on the wire, and allows the port binding to be reused while still
1233  * maintaining the invariant that so_pcb always points to a valid inpcb until
1234  * in_pcbdetach().
1235  *
1236  * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
1237  * in_pcbnotifyall() and in_pcbpurgeif0()?
1238  */
1239 void
1240 in_pcbdrop(struct inpcb *inp)
1241 {
1242
1243         INP_WLOCK_ASSERT(inp);
1244
1245         /*
1246          * XXXRW: Possibly we should protect the setting of INP_DROPPED with
1247          * the hash lock...?
1248          */
1249         inp->inp_flags |= INP_DROPPED;
1250         if (inp->inp_flags & INP_INHASHLIST) {
1251                 struct inpcbport *phd = inp->inp_phd;
1252
1253                 INP_HASH_WLOCK(inp->inp_pcbinfo);
1254                 LIST_REMOVE(inp, inp_hash);
1255                 LIST_REMOVE(inp, inp_portlist);
1256                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1257                         LIST_REMOVE(phd, phd_hash);
1258                         free(phd, M_PCB);
1259                 }
1260                 INP_HASH_WUNLOCK(inp->inp_pcbinfo);
1261                 inp->inp_flags &= ~INP_INHASHLIST;
1262 #ifdef PCBGROUP
1263                 in_pcbgroup_remove(inp);
1264 #endif
1265         }
1266 }
1267
1268 #ifdef INET
1269 /*
1270  * Common routines to return the socket addresses associated with inpcbs.
1271  */
1272 struct sockaddr *
1273 in_sockaddr(in_port_t port, struct in_addr *addr_p)
1274 {
1275         struct sockaddr_in *sin;
1276
1277         sin = malloc(sizeof *sin, M_SONAME,
1278                 M_WAITOK | M_ZERO);
1279         sin->sin_family = AF_INET;
1280         sin->sin_len = sizeof(*sin);
1281         sin->sin_addr = *addr_p;
1282         sin->sin_port = port;
1283
1284         return (struct sockaddr *)sin;
1285 }
1286
1287 int
1288 in_getsockaddr(struct socket *so, struct sockaddr **nam)
1289 {
1290         struct inpcb *inp;
1291         struct in_addr addr;
1292         in_port_t port;
1293
1294         inp = sotoinpcb(so);
1295         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
1296
1297         INP_RLOCK(inp);
1298         port = inp->inp_lport;
1299         addr = inp->inp_laddr;
1300         INP_RUNLOCK(inp);
1301
1302         *nam = in_sockaddr(port, &addr);
1303         return 0;
1304 }
1305
1306 int
1307 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
1308 {
1309         struct inpcb *inp;
1310         struct in_addr addr;
1311         in_port_t port;
1312
1313         inp = sotoinpcb(so);
1314         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
1315
1316         INP_RLOCK(inp);
1317         port = inp->inp_fport;
1318         addr = inp->inp_faddr;
1319         INP_RUNLOCK(inp);
1320
1321         *nam = in_sockaddr(port, &addr);
1322         return 0;
1323 }
1324
1325 void
1326 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
1327     struct inpcb *(*notify)(struct inpcb *, int))
1328 {
1329         struct inpcb *inp, *inp_temp;
1330
1331         INP_INFO_WLOCK(pcbinfo);
1332         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
1333                 INP_WLOCK(inp);
1334 #ifdef INET6
1335                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1336                         INP_WUNLOCK(inp);
1337                         continue;
1338                 }
1339 #endif
1340                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1341                     inp->inp_socket == NULL) {
1342                         INP_WUNLOCK(inp);
1343                         continue;
1344                 }
1345                 if ((*notify)(inp, errno))
1346                         INP_WUNLOCK(inp);
1347         }
1348         INP_INFO_WUNLOCK(pcbinfo);
1349 }
1350
1351 void
1352 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
1353 {
1354         struct inpcb *inp;
1355         struct ip_moptions *imo;
1356         int i, gap;
1357
1358         INP_INFO_RLOCK(pcbinfo);
1359         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
1360                 INP_WLOCK(inp);
1361                 imo = inp->inp_moptions;
1362                 if ((inp->inp_vflag & INP_IPV4) &&
1363                     imo != NULL) {
1364                         /*
1365                          * Unselect the outgoing interface if it is being
1366                          * detached.
1367                          */
1368                         if (imo->imo_multicast_ifp == ifp)
1369                                 imo->imo_multicast_ifp = NULL;
1370
1371                         /*
1372                          * Drop multicast group membership if we joined
1373                          * through the interface being detached.
1374                          */
1375                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1376                             i++) {
1377                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1378                                         in_delmulti(imo->imo_membership[i]);
1379                                         gap++;
1380                                 } else if (gap != 0)
1381                                         imo->imo_membership[i - gap] =
1382                                             imo->imo_membership[i];
1383                         }
1384                         imo->imo_num_memberships -= gap;
1385                 }
1386                 INP_WUNLOCK(inp);
1387         }
1388         INP_INFO_RUNLOCK(pcbinfo);
1389 }
1390
1391 /*
1392  * Lookup a PCB based on the local address and port.  Caller must hold the
1393  * hash lock.  No inpcb locks or references are acquired.
1394  */
1395 #define INP_LOOKUP_MAPPED_PCB_COST      3
1396 struct inpcb *
1397 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
1398     u_short lport, int lookupflags, struct ucred *cred)
1399 {
1400         struct inpcb *inp;
1401 #ifdef INET6
1402         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
1403 #else
1404         int matchwild = 3;
1405 #endif
1406         int wildcard;
1407
1408         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1409             ("%s: invalid lookup flags %d", __func__, lookupflags));
1410
1411         INP_HASH_LOCK_ASSERT(pcbinfo);
1412
1413         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
1414                 struct inpcbhead *head;
1415                 /*
1416                  * Look for an unconnected (wildcard foreign addr) PCB that
1417                  * matches the local address and port we're looking for.
1418                  */
1419                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1420                     0, pcbinfo->ipi_hashmask)];
1421                 LIST_FOREACH(inp, head, inp_hash) {
1422 #ifdef INET6
1423                         /* XXX inp locking */
1424                         if ((inp->inp_vflag & INP_IPV4) == 0)
1425                                 continue;
1426 #endif
1427                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1428                             inp->inp_laddr.s_addr == laddr.s_addr &&
1429                             inp->inp_lport == lport) {
1430                                 /*
1431                                  * Found?
1432                                  */
1433                                 if (cred == NULL ||
1434                                     prison_equal_ip4(cred->cr_prison,
1435                                         inp->inp_cred->cr_prison))
1436                                         return (inp);
1437                         }
1438                 }
1439                 /*
1440                  * Not found.
1441                  */
1442                 return (NULL);
1443         } else {
1444                 struct inpcbporthead *porthash;
1445                 struct inpcbport *phd;
1446                 struct inpcb *match = NULL;
1447                 /*
1448                  * Best fit PCB lookup.
1449                  *
1450                  * First see if this local port is in use by looking on the
1451                  * port hash list.
1452                  */
1453                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
1454                     pcbinfo->ipi_porthashmask)];
1455                 LIST_FOREACH(phd, porthash, phd_hash) {
1456                         if (phd->phd_port == lport)
1457                                 break;
1458                 }
1459                 if (phd != NULL) {
1460                         /*
1461                          * Port is in use by one or more PCBs. Look for best
1462                          * fit.
1463                          */
1464                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1465                                 wildcard = 0;
1466                                 if (cred != NULL &&
1467                                     !prison_equal_ip4(inp->inp_cred->cr_prison,
1468                                         cred->cr_prison))
1469                                         continue;
1470 #ifdef INET6
1471                                 /* XXX inp locking */
1472                                 if ((inp->inp_vflag & INP_IPV4) == 0)
1473                                         continue;
1474                                 /*
1475                                  * We never select the PCB that has
1476                                  * INP_IPV6 flag and is bound to :: if
1477                                  * we have another PCB which is bound
1478                                  * to 0.0.0.0.  If a PCB has the
1479                                  * INP_IPV6 flag, then we set its cost
1480                                  * higher than IPv4 only PCBs.
1481                                  *
1482                                  * Note that the case only happens
1483                                  * when a socket is bound to ::, under
1484                                  * the condition that the use of the
1485                                  * mapped address is allowed.
1486                                  */
1487                                 if ((inp->inp_vflag & INP_IPV6) != 0)
1488                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
1489 #endif
1490                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
1491                                         wildcard++;
1492                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
1493                                         if (laddr.s_addr == INADDR_ANY)
1494                                                 wildcard++;
1495                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
1496                                                 continue;
1497                                 } else {
1498                                         if (laddr.s_addr != INADDR_ANY)
1499                                                 wildcard++;
1500                                 }
1501                                 if (wildcard < matchwild) {
1502                                         match = inp;
1503                                         matchwild = wildcard;
1504                                         if (matchwild == 0)
1505                                                 break;
1506                                 }
1507                         }
1508                 }
1509                 return (match);
1510         }
1511 }
1512 #undef INP_LOOKUP_MAPPED_PCB_COST
1513
1514 #ifdef PCBGROUP
1515 /*
1516  * Lookup PCB in hash list, using pcbgroup tables.
1517  */
1518 static struct inpcb *
1519 in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
1520     struct in_addr faddr, u_int fport_arg, struct in_addr laddr,
1521     u_int lport_arg, int lookupflags, struct ifnet *ifp)
1522 {
1523         struct inpcbhead *head;
1524         struct inpcb *inp, *tmpinp;
1525         u_short fport = fport_arg, lport = lport_arg;
1526
1527         /*
1528          * First look for an exact match.
1529          */
1530         tmpinp = NULL;
1531         INP_GROUP_LOCK(pcbgroup);
1532         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1533             pcbgroup->ipg_hashmask)];
1534         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
1535 #ifdef INET6
1536                 /* XXX inp locking */
1537                 if ((inp->inp_vflag & INP_IPV4) == 0)
1538                         continue;
1539 #endif
1540                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1541                     inp->inp_laddr.s_addr == laddr.s_addr &&
1542                     inp->inp_fport == fport &&
1543                     inp->inp_lport == lport) {
1544                         /*
1545                          * XXX We should be able to directly return
1546                          * the inp here, without any checks.
1547                          * Well unless both bound with SO_REUSEPORT?
1548                          */
1549                         if (prison_flag(inp->inp_cred, PR_IP4))
1550                                 goto found;
1551                         if (tmpinp == NULL)
1552                                 tmpinp = inp;
1553                 }
1554         }
1555         if (tmpinp != NULL) {
1556                 inp = tmpinp;
1557                 goto found;
1558         }
1559
1560         /*
1561          * Then look for a wildcard match, if requested.
1562          */
1563         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1564                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1565 #ifdef INET6
1566                 struct inpcb *local_wild_mapped = NULL;
1567 #endif
1568                 struct inpcb *jail_wild = NULL;
1569                 struct inpcbhead *head;
1570                 int injail;
1571
1572                 /*
1573                  * Order of socket selection - we always prefer jails.
1574                  *      1. jailed, non-wild.
1575                  *      2. jailed, wild.
1576                  *      3. non-jailed, non-wild.
1577                  *      4. non-jailed, wild.
1578                  */
1579                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
1580                     0, pcbinfo->ipi_wildmask)];
1581                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
1582 #ifdef INET6
1583                         /* XXX inp locking */
1584                         if ((inp->inp_vflag & INP_IPV4) == 0)
1585                                 continue;
1586 #endif
1587                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1588                             inp->inp_lport != lport)
1589                                 continue;
1590
1591                         /* XXX inp locking */
1592                         if (ifp && ifp->if_type == IFT_FAITH &&
1593                             (inp->inp_flags & INP_FAITH) == 0)
1594                                 continue;
1595
1596                         injail = prison_flag(inp->inp_cred, PR_IP4);
1597                         if (injail) {
1598                                 if (prison_check_ip4(inp->inp_cred,
1599                                     &laddr) != 0)
1600                                         continue;
1601                         } else {
1602                                 if (local_exact != NULL)
1603                                         continue;
1604                         }
1605
1606                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1607                                 if (injail)
1608                                         goto found;
1609                                 else
1610                                         local_exact = inp;
1611                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1612 #ifdef INET6
1613                                 /* XXX inp locking, NULL check */
1614                                 if (inp->inp_vflag & INP_IPV6PROTO)
1615                                         local_wild_mapped = inp;
1616                                 else
1617 #endif
1618                                         if (injail)
1619                                                 jail_wild = inp;
1620                                         else
1621                                                 local_wild = inp;
1622                         }
1623                 } /* LIST_FOREACH */
1624                 inp = jail_wild;
1625                 if (inp == NULL)
1626                         inp = local_exact;
1627                 if (inp == NULL)
1628                         inp = local_wild;
1629 #ifdef INET6
1630                 if (inp == NULL)
1631                         inp = local_wild_mapped;
1632 #endif
1633                 if (inp != NULL)
1634                         goto found;
1635         } /* if (lookupflags & INPLOOKUP_WILDCARD) */
1636         INP_GROUP_UNLOCK(pcbgroup);
1637         return (NULL);
1638
1639 found:
1640         in_pcbref(inp);
1641         INP_GROUP_UNLOCK(pcbgroup);
1642         if (lookupflags & INPLOOKUP_WLOCKPCB) {
1643                 INP_WLOCK(inp);
1644                 if (in_pcbrele_wlocked(inp))
1645                         return (NULL);
1646         } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1647                 INP_RLOCK(inp);
1648                 if (in_pcbrele_rlocked(inp))
1649                         return (NULL);
1650         } else
1651                 panic("%s: locking bug", __func__);
1652         return (inp);
1653 }
1654 #endif /* PCBGROUP */
1655
1656 /*
1657  * Lookup PCB in hash list, using pcbinfo tables.  This variation assumes
1658  * that the caller has locked the hash list, and will not perform any further
1659  * locking or reference operations on either the hash list or the connection.
1660  */
1661 static struct inpcb *
1662 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1663     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags,
1664     struct ifnet *ifp)
1665 {
1666         struct inpcbhead *head;
1667         struct inpcb *inp, *tmpinp;
1668         u_short fport = fport_arg, lport = lport_arg;
1669
1670         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1671             ("%s: invalid lookup flags %d", __func__, lookupflags));
1672
1673         INP_HASH_LOCK_ASSERT(pcbinfo);
1674
1675         /*
1676          * First look for an exact match.
1677          */
1678         tmpinp = NULL;
1679         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1680             pcbinfo->ipi_hashmask)];
1681         LIST_FOREACH(inp, head, inp_hash) {
1682 #ifdef INET6
1683                 /* XXX inp locking */
1684                 if ((inp->inp_vflag & INP_IPV4) == 0)
1685                         continue;
1686 #endif
1687                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1688                     inp->inp_laddr.s_addr == laddr.s_addr &&
1689                     inp->inp_fport == fport &&
1690                     inp->inp_lport == lport) {
1691                         /*
1692                          * XXX We should be able to directly return
1693                          * the inp here, without any checks.
1694                          * Well unless both bound with SO_REUSEPORT?
1695                          */
1696                         if (prison_flag(inp->inp_cred, PR_IP4))
1697                                 return (inp);
1698                         if (tmpinp == NULL)
1699                                 tmpinp = inp;
1700                 }
1701         }
1702         if (tmpinp != NULL)
1703                 return (tmpinp);
1704
1705         /*
1706          * Then look for a wildcard match, if requested.
1707          */
1708         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1709                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1710 #ifdef INET6
1711                 struct inpcb *local_wild_mapped = NULL;
1712 #endif
1713                 struct inpcb *jail_wild = NULL;
1714                 int injail;
1715
1716                 /*
1717                  * Order of socket selection - we always prefer jails.
1718                  *      1. jailed, non-wild.
1719                  *      2. jailed, wild.
1720                  *      3. non-jailed, non-wild.
1721                  *      4. non-jailed, wild.
1722                  */
1723
1724                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1725                     0, pcbinfo->ipi_hashmask)];
1726                 LIST_FOREACH(inp, head, inp_hash) {
1727 #ifdef INET6
1728                         /* XXX inp locking */
1729                         if ((inp->inp_vflag & INP_IPV4) == 0)
1730                                 continue;
1731 #endif
1732                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1733                             inp->inp_lport != lport)
1734                                 continue;
1735
1736                         /* XXX inp locking */
1737                         if (ifp && ifp->if_type == IFT_FAITH &&
1738                             (inp->inp_flags & INP_FAITH) == 0)
1739                                 continue;
1740
1741                         injail = prison_flag(inp->inp_cred, PR_IP4);
1742                         if (injail) {
1743                                 if (prison_check_ip4(inp->inp_cred,
1744                                     &laddr) != 0)
1745                                         continue;
1746                         } else {
1747                                 if (local_exact != NULL)
1748                                         continue;
1749                         }
1750
1751                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1752                                 if (injail)
1753                                         return (inp);
1754                                 else
1755                                         local_exact = inp;
1756                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1757 #ifdef INET6
1758                                 /* XXX inp locking, NULL check */
1759                                 if (inp->inp_vflag & INP_IPV6PROTO)
1760                                         local_wild_mapped = inp;
1761                                 else
1762 #endif
1763                                         if (injail)
1764                                                 jail_wild = inp;
1765                                         else
1766                                                 local_wild = inp;
1767                         }
1768                 } /* LIST_FOREACH */
1769                 if (jail_wild != NULL)
1770                         return (jail_wild);
1771                 if (local_exact != NULL)
1772                         return (local_exact);
1773                 if (local_wild != NULL)
1774                         return (local_wild);
1775 #ifdef INET6
1776                 if (local_wild_mapped != NULL)
1777                         return (local_wild_mapped);
1778 #endif
1779         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1780
1781         return (NULL);
1782 }
1783
1784 /*
1785  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1786  * hash list lock, and will return the inpcb locked (i.e., requires
1787  * INPLOOKUP_LOCKPCB).
1788  */
1789 static struct inpcb *
1790 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1791     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1792     struct ifnet *ifp)
1793 {
1794         struct inpcb *inp;
1795
1796         INP_HASH_RLOCK(pcbinfo);
1797         inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1798             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1799         if (inp != NULL) {
1800                 in_pcbref(inp);
1801                 INP_HASH_RUNLOCK(pcbinfo);
1802                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1803                         INP_WLOCK(inp);
1804                         if (in_pcbrele_wlocked(inp))
1805                                 return (NULL);
1806                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1807                         INP_RLOCK(inp);
1808                         if (in_pcbrele_rlocked(inp))
1809                                 return (NULL);
1810                 } else
1811                         panic("%s: locking bug", __func__);
1812         } else
1813                 INP_HASH_RUNLOCK(pcbinfo);
1814         return (inp);
1815 }
1816
1817 /*
1818  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1819  * from which a pre-calculated hash value may be extracted.
1820  *
1821  * Possibly more of this logic should be in in_pcbgroup.c.
1822  */
1823 struct inpcb *
1824 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport,
1825     struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1826 {
1827 #if defined(PCBGROUP)
1828         struct inpcbgroup *pcbgroup;
1829 #endif
1830
1831         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1832             ("%s: invalid lookup flags %d", __func__, lookupflags));
1833         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1834             ("%s: LOCKPCB not set", __func__));
1835
1836 #if defined(PCBGROUP)
1837         if (in_pcbgroup_enabled(pcbinfo)) {
1838                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1839                     fport);
1840                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1841                     laddr, lport, lookupflags, ifp));
1842         }
1843 #endif
1844         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1845             lookupflags, ifp));
1846 }
1847
1848 struct inpcb *
1849 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1850     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1851     struct ifnet *ifp, struct mbuf *m)
1852 {
1853 #ifdef PCBGROUP
1854         struct inpcbgroup *pcbgroup;
1855 #endif
1856
1857         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1858             ("%s: invalid lookup flags %d", __func__, lookupflags));
1859         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1860             ("%s: LOCKPCB not set", __func__));
1861
1862 #ifdef PCBGROUP
1863         if (in_pcbgroup_enabled(pcbinfo)) {
1864                 pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1865                     m->m_pkthdr.flowid);
1866                 if (pcbgroup != NULL)
1867                         return (in_pcblookup_group(pcbinfo, pcbgroup, faddr,
1868                             fport, laddr, lport, lookupflags, ifp));
1869                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1870                     fport);
1871                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1872                     laddr, lport, lookupflags, ifp));
1873         }
1874 #endif
1875         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1876             lookupflags, ifp));
1877 }
1878 #endif /* INET */
1879
1880 /*
1881  * Insert PCB onto various hash lists.
1882  */
1883 static int
1884 in_pcbinshash_internal(struct inpcb *inp, int do_pcbgroup_update)
1885 {
1886         struct inpcbhead *pcbhash;
1887         struct inpcbporthead *pcbporthash;
1888         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1889         struct inpcbport *phd;
1890         u_int32_t hashkey_faddr;
1891
1892         INP_WLOCK_ASSERT(inp);
1893         INP_HASH_WLOCK_ASSERT(pcbinfo);
1894
1895         KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
1896             ("in_pcbinshash: INP_INHASHLIST"));
1897
1898 #ifdef INET6
1899         if (inp->inp_vflag & INP_IPV6)
1900                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1901         else
1902 #endif
1903         hashkey_faddr = inp->inp_faddr.s_addr;
1904
1905         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1906                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1907
1908         pcbporthash = &pcbinfo->ipi_porthashbase[
1909             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
1910
1911         /*
1912          * Go through port list and look for a head for this lport.
1913          */
1914         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1915                 if (phd->phd_port == inp->inp_lport)
1916                         break;
1917         }
1918         /*
1919          * If none exists, malloc one and tack it on.
1920          */
1921         if (phd == NULL) {
1922                 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1923                 if (phd == NULL) {
1924                         return (ENOBUFS); /* XXX */
1925                 }
1926                 phd->phd_port = inp->inp_lport;
1927                 LIST_INIT(&phd->phd_pcblist);
1928                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1929         }
1930         inp->inp_phd = phd;
1931         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1932         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1933         inp->inp_flags |= INP_INHASHLIST;
1934 #ifdef PCBGROUP
1935         if (do_pcbgroup_update)
1936                 in_pcbgroup_update(inp);
1937 #endif
1938         return (0);
1939 }
1940
1941 /*
1942  * For now, there are two public interfaces to insert an inpcb into the hash
1943  * lists -- one that does update pcbgroups, and one that doesn't.  The latter
1944  * is used only in the TCP syncache, where in_pcbinshash is called before the
1945  * full 4-tuple is set for the inpcb, and we don't want to install in the
1946  * pcbgroup until later.
1947  *
1948  * XXXRW: This seems like a misfeature.  in_pcbinshash should always update
1949  * connection groups, and partially initialised inpcbs should not be exposed
1950  * to either reservation hash tables or pcbgroups.
1951  */
1952 int
1953 in_pcbinshash(struct inpcb *inp)
1954 {
1955
1956         return (in_pcbinshash_internal(inp, 1));
1957 }
1958
1959 int
1960 in_pcbinshash_nopcbgroup(struct inpcb *inp)
1961 {
1962
1963         return (in_pcbinshash_internal(inp, 0));
1964 }
1965
1966 /*
1967  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1968  * changed. NOTE: This does not handle the case of the lport changing (the
1969  * hashed port list would have to be updated as well), so the lport must
1970  * not change after in_pcbinshash() has been called.
1971  */
1972 void
1973 in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m)
1974 {
1975         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1976         struct inpcbhead *head;
1977         u_int32_t hashkey_faddr;
1978
1979         INP_WLOCK_ASSERT(inp);
1980         INP_HASH_WLOCK_ASSERT(pcbinfo);
1981
1982         KASSERT(inp->inp_flags & INP_INHASHLIST,
1983             ("in_pcbrehash: !INP_INHASHLIST"));
1984
1985 #ifdef INET6
1986         if (inp->inp_vflag & INP_IPV6)
1987                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1988         else
1989 #endif
1990         hashkey_faddr = inp->inp_faddr.s_addr;
1991
1992         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1993                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1994
1995         LIST_REMOVE(inp, inp_hash);
1996         LIST_INSERT_HEAD(head, inp, inp_hash);
1997
1998 #ifdef PCBGROUP
1999         if (m != NULL)
2000                 in_pcbgroup_update_mbuf(inp, m);
2001         else
2002                 in_pcbgroup_update(inp);
2003 #endif
2004 }
2005
2006 void
2007 in_pcbrehash(struct inpcb *inp)
2008 {
2009
2010         in_pcbrehash_mbuf(inp, NULL);
2011 }
2012
2013 /*
2014  * Remove PCB from various lists.
2015  */
2016 static void
2017 in_pcbremlists(struct inpcb *inp)
2018 {
2019         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
2020
2021         INP_INFO_WLOCK_ASSERT(pcbinfo);
2022         INP_WLOCK_ASSERT(inp);
2023
2024         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
2025         if (inp->inp_flags & INP_INHASHLIST) {
2026                 struct inpcbport *phd = inp->inp_phd;
2027
2028                 INP_HASH_WLOCK(pcbinfo);
2029                 LIST_REMOVE(inp, inp_hash);
2030                 LIST_REMOVE(inp, inp_portlist);
2031                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
2032                         LIST_REMOVE(phd, phd_hash);
2033                         free(phd, M_PCB);
2034                 }
2035                 INP_HASH_WUNLOCK(pcbinfo);
2036                 inp->inp_flags &= ~INP_INHASHLIST;
2037         }
2038         LIST_REMOVE(inp, inp_list);
2039         pcbinfo->ipi_count--;
2040 #ifdef PCBGROUP
2041         in_pcbgroup_remove(inp);
2042 #endif
2043 }
2044
2045 /*
2046  * A set label operation has occurred at the socket layer, propagate the
2047  * label change into the in_pcb for the socket.
2048  */
2049 void
2050 in_pcbsosetlabel(struct socket *so)
2051 {
2052 #ifdef MAC
2053         struct inpcb *inp;
2054
2055         inp = sotoinpcb(so);
2056         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
2057
2058         INP_WLOCK(inp);
2059         SOCK_LOCK(so);
2060         mac_inpcb_sosetlabel(so, inp);
2061         SOCK_UNLOCK(so);
2062         INP_WUNLOCK(inp);
2063 #endif
2064 }
2065
2066 /*
2067  * ipport_tick runs once per second, determining if random port allocation
2068  * should be continued.  If more than ipport_randomcps ports have been
2069  * allocated in the last second, then we return to sequential port
2070  * allocation. We return to random allocation only once we drop below
2071  * ipport_randomcps for at least ipport_randomtime seconds.
2072  */
2073 static void
2074 ipport_tick(void *xtp)
2075 {
2076         VNET_ITERATOR_DECL(vnet_iter);
2077
2078         VNET_LIST_RLOCK_NOSLEEP();
2079         VNET_FOREACH(vnet_iter) {
2080                 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
2081                 if (V_ipport_tcpallocs <=
2082                     V_ipport_tcplastcount + V_ipport_randomcps) {
2083                         if (V_ipport_stoprandom > 0)
2084                                 V_ipport_stoprandom--;
2085                 } else
2086                         V_ipport_stoprandom = V_ipport_randomtime;
2087                 V_ipport_tcplastcount = V_ipport_tcpallocs;
2088                 CURVNET_RESTORE();
2089         }
2090         VNET_LIST_RUNLOCK_NOSLEEP();
2091         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
2092 }
2093
2094 static void
2095 ip_fini(void *xtp)
2096 {
2097
2098         callout_stop(&ipport_tick_callout);
2099 }
2100
2101 /*
2102  * The ipport_callout should start running at about the time we attach the
2103  * inet or inet6 domains.
2104  */
2105 static void
2106 ipport_tick_init(const void *unused __unused)
2107 {
2108
2109         /* Start ipport_tick. */
2110         callout_init(&ipport_tick_callout, CALLOUT_MPSAFE);
2111         callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL);
2112         EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL,
2113                 SHUTDOWN_PRI_DEFAULT);
2114 }
2115 SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
2116     ipport_tick_init, NULL);
2117
2118 void
2119 inp_wlock(struct inpcb *inp)
2120 {
2121
2122         INP_WLOCK(inp);
2123 }
2124
2125 void
2126 inp_wunlock(struct inpcb *inp)
2127 {
2128
2129         INP_WUNLOCK(inp);
2130 }
2131
2132 void
2133 inp_rlock(struct inpcb *inp)
2134 {
2135
2136         INP_RLOCK(inp);
2137 }
2138
2139 void
2140 inp_runlock(struct inpcb *inp)
2141 {
2142
2143         INP_RUNLOCK(inp);
2144 }
2145
2146 #ifdef INVARIANTS
2147 void
2148 inp_lock_assert(struct inpcb *inp)
2149 {
2150
2151         INP_WLOCK_ASSERT(inp);
2152 }
2153
2154 void
2155 inp_unlock_assert(struct inpcb *inp)
2156 {
2157
2158         INP_UNLOCK_ASSERT(inp);
2159 }
2160 #endif
2161
2162 void
2163 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
2164 {
2165         struct inpcb *inp;
2166
2167         INP_INFO_RLOCK(&V_tcbinfo);
2168         LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
2169                 INP_WLOCK(inp);
2170                 func(inp, arg);
2171                 INP_WUNLOCK(inp);
2172         }
2173         INP_INFO_RUNLOCK(&V_tcbinfo);
2174 }
2175
2176 struct socket *
2177 inp_inpcbtosocket(struct inpcb *inp)
2178 {
2179
2180         INP_WLOCK_ASSERT(inp);
2181         return (inp->inp_socket);
2182 }
2183
2184 struct tcpcb *
2185 inp_inpcbtotcpcb(struct inpcb *inp)
2186 {
2187
2188         INP_WLOCK_ASSERT(inp);
2189         return ((struct tcpcb *)inp->inp_ppcb);
2190 }
2191
2192 int
2193 inp_ip_tos_get(const struct inpcb *inp)
2194 {
2195
2196         return (inp->inp_ip_tos);
2197 }
2198
2199 void
2200 inp_ip_tos_set(struct inpcb *inp, int val)
2201 {
2202
2203         inp->inp_ip_tos = val;
2204 }
2205
2206 void
2207 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
2208     uint32_t *faddr, uint16_t *fp)
2209 {
2210
2211         INP_LOCK_ASSERT(inp);
2212         *laddr = inp->inp_laddr.s_addr;
2213         *faddr = inp->inp_faddr.s_addr;
2214         *lp = inp->inp_lport;
2215         *fp = inp->inp_fport;
2216 }
2217
2218 struct inpcb *
2219 so_sotoinpcb(struct socket *so)
2220 {
2221
2222         return (sotoinpcb(so));
2223 }
2224
2225 struct tcpcb *
2226 so_sototcpcb(struct socket *so)
2227 {
2228
2229         return (sototcpcb(so));
2230 }
2231
2232 #ifdef DDB
2233 static void
2234 db_print_indent(int indent)
2235 {
2236         int i;
2237
2238         for (i = 0; i < indent; i++)
2239                 db_printf(" ");
2240 }
2241
2242 static void
2243 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
2244 {
2245         char faddr_str[48], laddr_str[48];
2246
2247         db_print_indent(indent);
2248         db_printf("%s at %p\n", name, inc);
2249
2250         indent += 2;
2251
2252 #ifdef INET6
2253         if (inc->inc_flags & INC_ISIPV6) {
2254                 /* IPv6. */
2255                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
2256                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
2257         } else
2258 #endif
2259         {
2260                 /* IPv4. */
2261                 inet_ntoa_r(inc->inc_laddr, laddr_str);
2262                 inet_ntoa_r(inc->inc_faddr, faddr_str);
2263         }
2264         db_print_indent(indent);
2265         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
2266             ntohs(inc->inc_lport));
2267         db_print_indent(indent);
2268         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
2269             ntohs(inc->inc_fport));
2270 }
2271
2272 static void
2273 db_print_inpflags(int inp_flags)
2274 {
2275         int comma;
2276
2277         comma = 0;
2278         if (inp_flags & INP_RECVOPTS) {
2279                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
2280                 comma = 1;
2281         }
2282         if (inp_flags & INP_RECVRETOPTS) {
2283                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
2284                 comma = 1;
2285         }
2286         if (inp_flags & INP_RECVDSTADDR) {
2287                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
2288                 comma = 1;
2289         }
2290         if (inp_flags & INP_HDRINCL) {
2291                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
2292                 comma = 1;
2293         }
2294         if (inp_flags & INP_HIGHPORT) {
2295                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
2296                 comma = 1;
2297         }
2298         if (inp_flags & INP_LOWPORT) {
2299                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
2300                 comma = 1;
2301         }
2302         if (inp_flags & INP_ANONPORT) {
2303                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
2304                 comma = 1;
2305         }
2306         if (inp_flags & INP_RECVIF) {
2307                 db_printf("%sINP_RECVIF", comma ? ", " : "");
2308                 comma = 1;
2309         }
2310         if (inp_flags & INP_MTUDISC) {
2311                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
2312                 comma = 1;
2313         }
2314         if (inp_flags & INP_FAITH) {
2315                 db_printf("%sINP_FAITH", comma ? ", " : "");
2316                 comma = 1;
2317         }
2318         if (inp_flags & INP_RECVTTL) {
2319                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
2320                 comma = 1;
2321         }
2322         if (inp_flags & INP_DONTFRAG) {
2323                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
2324                 comma = 1;
2325         }
2326         if (inp_flags & INP_RECVTOS) {
2327                 db_printf("%sINP_RECVTOS", comma ? ", " : "");
2328                 comma = 1;
2329         }
2330         if (inp_flags & IN6P_IPV6_V6ONLY) {
2331                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
2332                 comma = 1;
2333         }
2334         if (inp_flags & IN6P_PKTINFO) {
2335                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
2336                 comma = 1;
2337         }
2338         if (inp_flags & IN6P_HOPLIMIT) {
2339                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
2340                 comma = 1;
2341         }
2342         if (inp_flags & IN6P_HOPOPTS) {
2343                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
2344                 comma = 1;
2345         }
2346         if (inp_flags & IN6P_DSTOPTS) {
2347                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
2348                 comma = 1;
2349         }
2350         if (inp_flags & IN6P_RTHDR) {
2351                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
2352                 comma = 1;
2353         }
2354         if (inp_flags & IN6P_RTHDRDSTOPTS) {
2355                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
2356                 comma = 1;
2357         }
2358         if (inp_flags & IN6P_TCLASS) {
2359                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
2360                 comma = 1;
2361         }
2362         if (inp_flags & IN6P_AUTOFLOWLABEL) {
2363                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
2364                 comma = 1;
2365         }
2366         if (inp_flags & INP_TIMEWAIT) {
2367                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
2368                 comma  = 1;
2369         }
2370         if (inp_flags & INP_ONESBCAST) {
2371                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
2372                 comma  = 1;
2373         }
2374         if (inp_flags & INP_DROPPED) {
2375                 db_printf("%sINP_DROPPED", comma ? ", " : "");
2376                 comma  = 1;
2377         }
2378         if (inp_flags & INP_SOCKREF) {
2379                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
2380                 comma  = 1;
2381         }
2382         if (inp_flags & IN6P_RFC2292) {
2383                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
2384                 comma = 1;
2385         }
2386         if (inp_flags & IN6P_MTU) {
2387                 db_printf("IN6P_MTU%s", comma ? ", " : "");
2388                 comma = 1;
2389         }
2390 }
2391
2392 static void
2393 db_print_inpvflag(u_char inp_vflag)
2394 {
2395         int comma;
2396
2397         comma = 0;
2398         if (inp_vflag & INP_IPV4) {
2399                 db_printf("%sINP_IPV4", comma ? ", " : "");
2400                 comma  = 1;
2401         }
2402         if (inp_vflag & INP_IPV6) {
2403                 db_printf("%sINP_IPV6", comma ? ", " : "");
2404                 comma  = 1;
2405         }
2406         if (inp_vflag & INP_IPV6PROTO) {
2407                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
2408                 comma  = 1;
2409         }
2410 }
2411
2412 static void
2413 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
2414 {
2415
2416         db_print_indent(indent);
2417         db_printf("%s at %p\n", name, inp);
2418
2419         indent += 2;
2420
2421         db_print_indent(indent);
2422         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
2423
2424         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
2425
2426         db_print_indent(indent);
2427         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
2428             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
2429
2430         db_print_indent(indent);
2431         db_printf("inp_label: %p   inp_flags: 0x%x (",
2432            inp->inp_label, inp->inp_flags);
2433         db_print_inpflags(inp->inp_flags);
2434         db_printf(")\n");
2435
2436         db_print_indent(indent);
2437         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
2438             inp->inp_vflag);
2439         db_print_inpvflag(inp->inp_vflag);
2440         db_printf(")\n");
2441
2442         db_print_indent(indent);
2443         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
2444             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
2445
2446         db_print_indent(indent);
2447 #ifdef INET6
2448         if (inp->inp_vflag & INP_IPV6) {
2449                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
2450                     "in6p_moptions: %p\n", inp->in6p_options,
2451                     inp->in6p_outputopts, inp->in6p_moptions);
2452                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
2453                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
2454                     inp->in6p_hops);
2455         } else
2456 #endif
2457         {
2458                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
2459                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
2460                     inp->inp_options, inp->inp_moptions);
2461         }
2462
2463         db_print_indent(indent);
2464         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
2465             (uintmax_t)inp->inp_gencnt);
2466 }
2467
2468 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
2469 {
2470         struct inpcb *inp;
2471
2472         if (!have_addr) {
2473                 db_printf("usage: show inpcb <addr>\n");
2474                 return;
2475         }
2476         inp = (struct inpcb *)addr;
2477
2478         db_print_inpcb(inp, "inpcb", 0);
2479 }
2480 #endif /* DDB */