sys/netinet/in_pcb.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1991, 1993, 1995
   3  *      The Regents of the University of California.
   4  * Copyright (c) 2007-2009 Robert N. M. Watson
   5  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   6  * All rights reserved.
   7  *
   8  * Portions of this software were developed by Robert N. M. Watson under
   9  * contract to Juniper Networks, Inc.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
  36  */
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include "opt_ddb.h"
  42 #include "opt_ipsec.h"
  43 #include "opt_inet.h"
  44 #include "opt_inet6.h"
  45 #include "opt_pcbgroup.h"
  46
  47 #include <sys/param.h>
  48 #include <sys/systm.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/callout.h>
  52 #include <sys/domain.h>
  53 #include <sys/protosw.h>
  54 #include <sys/socket.h>
  55 #include <sys/socketvar.h>
  56 #include <sys/priv.h>
  57 #include <sys/proc.h>
  58 #include <sys/refcount.h>
  59 #include <sys/jail.h>
  60 #include <sys/kernel.h>
  61 #include <sys/sysctl.h>
  62
  63 #ifdef DDB
  64 #include <ddb/ddb.h>
  65 #endif
  66
  67 #include <vm/uma.h>
  68
  69 #include <net/if.h>
  70 #include <net/if_types.h>
  71 #include <net/route.h>
  72 #include <net/vnet.h>
  73
  74 #if defined(INET) || defined(INET6)
  75 #include <netinet/in.h>
  76 #include <netinet/in_pcb.h>
  77 #include <netinet/ip_var.h>
  78 #include <netinet/tcp_var.h>
  79 #include <netinet/udp.h>
  80 #include <netinet/udp_var.h>
  81 #endif
  82 #ifdef INET
  83 #include <netinet/in_var.h>
  84 #endif
  85 #ifdef INET6
  86 #include <netinet/ip6.h>
  87 #include <netinet6/in6_pcb.h>
  88 #include <netinet6/in6_var.h>
  89 #include <netinet6/ip6_var.h>
  90 #endif /* INET6 */
  91
  92
  93 #ifdef IPSEC
  94 #include <netipsec/ipsec.h>
  95 #include <netipsec/key.h>
  96 #endif /* IPSEC */
  97
  98 #include <security/mac/mac_framework.h>
  99
 100 static struct callout   ipport_tick_callout;
 101
 102 /*
 103  * These configure the range of local port addresses assigned to
 104  * "unspecified" outgoing connections/packets/whatever.
 105  */
 106 VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1;    /* 1023 */
 107 VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART;    /* 600 */
 108 VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST;     /* 10000 */
 109 VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST;       /* 65535 */
 110 VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO;      /* 49152 */
 111 VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO;        /* 65535 */
 112
 113 /*
 114  * Reserved ports accessible only to root. There are significant
 115  * security considerations that must be accounted for when changing these,
 116  * but the security benefits can be great. Please be careful.
 117  */
 118 VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1;    /* 1023 */
 119 VNET_DEFINE(int, ipport_reservedlow);
 120
 121 /* Variables dealing with random ephemeral port allocation. */
 122 VNET_DEFINE(int, ipport_randomized) = 1;        /* user controlled via sysctl */
 123 VNET_DEFINE(int, ipport_randomcps) = 10;        /* user controlled via sysctl */
 124 VNET_DEFINE(int, ipport_randomtime) = 45;       /* user controlled via sysctl */
 125 VNET_DEFINE(int, ipport_stoprandom);            /* toggled by ipport_tick */
 126 VNET_DEFINE(int, ipport_tcpallocs);
 127 static VNET_DEFINE(int, ipport_tcplastcount);
 128
 129 #define V_ipport_tcplastcount           VNET(ipport_tcplastcount)
 130
 131 static void     in_pcbremlists(struct inpcb *inp);
 132 #ifdef INET
 133 static struct inpcb     *in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo,
 134                             struct in_addr faddr, u_int fport_arg,
 135                             struct in_addr laddr, u_int lport_arg,
 136                             int lookupflags, struct ifnet *ifp);
 137
 138 #define RANGECHK(var, min, max) \
 139         if ((var) < (min)) { (var) = (min); } \
 140         else if ((var) > (max)) { (var) = (max); }
 141
 142 static int
 143 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 144 {
 145         int error;
 146
 147         error = sysctl_handle_int(oidp, arg1, arg2, req);
 148         if (error == 0) {
 149                 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 150                 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 151                 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
 152                 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
 153                 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
 154                 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
 155         }
 156         return (error);
 157 }
 158
 159 #undef RANGECHK
 160
 161 static SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0,
 162     "IP Ports");
 163
 164 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst,
 165         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowfirstauto), 0,
 166         &sysctl_net_ipport_check, "I", "");
 167 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast,
 168         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowlastauto), 0,
 169         &sysctl_net_ipport_check, "I", "");
 170 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, first,
 171         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_firstauto), 0,
 172         &sysctl_net_ipport_check, "I", "");
 173 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, last,
 174         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lastauto), 0,
 175         &sysctl_net_ipport_check, "I", "");
 176 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst,
 177         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hifirstauto), 0,
 178         &sysctl_net_ipport_check, "I", "");
 179 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hilast,
 180         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hilastauto), 0,
 181         &sysctl_net_ipport_check, "I", "");
 182 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
 183         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedhigh), 0, "");
 184 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
 185         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, "");
 186 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
 187         &VNET_NAME(ipport_randomized), 0, "Enable random port allocation");
 188 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
 189         &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port "
 190         "allocations before switching to a sequental one");
 191 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
 192         &VNET_NAME(ipport_randomtime), 0,
 193         "Minimum time to keep sequental port "
 194         "allocation before switching to a random one");
 195 #endif /* INET */
 196
 197 /*
 198  * in_pcb.c: manage the Protocol Control Blocks.
 199  *
 200  * NOTE: It is assumed that most of these functions will be called with
 201  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
 202  * functions often modify hash chains or addresses in pcbs.
 203  */
 204
 205 /*
 206  * Initialize an inpcbinfo -- we should be able to reduce the number of
 207  * arguments in time.
 208  */
 209 void
 210 in_pcbinfo_init(struct inpcbinfo *pcbinfo, const char *name,
 211     struct inpcbhead *listhead, int hash_nelements, int porthash_nelements,
 212     char *inpcbzone_name, uma_init inpcbzone_init, uma_fini inpcbzone_fini,
 213     uint32_t inpcbzone_flags, u_int hashfields)
 214 {
 215
 216         INP_INFO_LOCK_INIT(pcbinfo, name);
 217         INP_HASH_LOCK_INIT(pcbinfo, "pcbinfohash");     /* XXXRW: argument? */
 218         INP_LIST_LOCK_INIT(pcbinfo, "pcbinfolist");
 219 #ifdef VIMAGE
 220         pcbinfo->ipi_vnet = curvnet;
 221 #endif
 222         pcbinfo->ipi_listhead = listhead;
 223         LIST_INIT(pcbinfo->ipi_listhead);
 224         pcbinfo->ipi_count = 0;
 225         pcbinfo->ipi_hashbase = hashinit(hash_nelements, M_PCB,
 226             &pcbinfo->ipi_hashmask);
 227         pcbinfo->ipi_porthashbase = hashinit(porthash_nelements, M_PCB,
 228             &pcbinfo->ipi_porthashmask);
 229 #ifdef PCBGROUP
 230         in_pcbgroup_init(pcbinfo, hashfields, hash_nelements);
 231 #endif
 232         pcbinfo->ipi_zone = uma_zcreate(inpcbzone_name, sizeof(struct inpcb),
 233             NULL, NULL, inpcbzone_init, inpcbzone_fini, UMA_ALIGN_PTR,
 234             inpcbzone_flags);
 235         uma_zone_set_max(pcbinfo->ipi_zone, maxsockets);
 236         uma_zone_set_warning(pcbinfo->ipi_zone,
 237             "kern.ipc.maxsockets limit reached");
 238 }
 239
 240 /*
 241  * Destroy an inpcbinfo.
 242  */
 243 void
 244 in_pcbinfo_destroy(struct inpcbinfo *pcbinfo)
 245 {
 246
 247         KASSERT(pcbinfo->ipi_count == 0,
 248             ("%s: ipi_count = %u", __func__, pcbinfo->ipi_count));
 249
 250         hashdestroy(pcbinfo->ipi_hashbase, M_PCB, pcbinfo->ipi_hashmask);
 251         hashdestroy(pcbinfo->ipi_porthashbase, M_PCB,
 252             pcbinfo->ipi_porthashmask);
 253 #ifdef PCBGROUP
 254         in_pcbgroup_destroy(pcbinfo);
 255 #endif
 256         uma_zdestroy(pcbinfo->ipi_zone);
 257         INP_LIST_LOCK_DESTROY(pcbinfo);
 258         INP_HASH_LOCK_DESTROY(pcbinfo);
 259         INP_INFO_LOCK_DESTROY(pcbinfo);
 260 }
 261
 262 /*
 263  * Allocate a PCB and associate it with the socket.
 264  * On success return with the PCB locked.
 265  */
 266 int
 267 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 268 {
 269         struct inpcb *inp;
 270         int error;
 271
 272 #ifdef INVARIANTS
 273         if (pcbinfo == &V_tcbinfo) {
 274                 INP_INFO_RLOCK_ASSERT(pcbinfo);
 275         } else {
 276                 INP_INFO_WLOCK_ASSERT(pcbinfo);
 277         }
 278 #endif
 279
 280         error = 0;
 281         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
 282         if (inp == NULL)
 283                 return (ENOBUFS);
 284         bzero(inp, inp_zero_size);
 285         inp->inp_pcbinfo = pcbinfo;
 286         inp->inp_socket = so;
 287         inp->inp_cred = crhold(so->so_cred);
 288         inp->inp_inc.inc_fibnum = so->so_fibnum;
 289 #ifdef MAC
 290         error = mac_inpcb_init(inp, M_NOWAIT);
 291         if (error != 0)
 292                 goto out;
 293         mac_inpcb_create(so, inp);
 294 #endif
 295 #ifdef IPSEC
 296         error = ipsec_init_policy(so, &inp->inp_sp);
 297         if (error != 0) {
 298 #ifdef MAC
 299                 mac_inpcb_destroy(inp);
 300 #endif
 301                 goto out;
 302         }
 303 #endif /*IPSEC*/
 304 #ifdef INET6
 305         if (INP_SOCKAF(so) == AF_INET6) {
 306                 inp->inp_vflag |= INP_IPV6PROTO;
 307                 if (V_ip6_v6only)
 308                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 309         }
 310 #endif
 311         INP_WLOCK(inp);
 312         INP_LIST_WLOCK(pcbinfo);
 313         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
 314         pcbinfo->ipi_count++;
 315         so->so_pcb = (caddr_t)inp;
 316 #ifdef INET6
 317         if (V_ip6_auto_flowlabel)
 318                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 319 #endif
 320         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 321         refcount_init(&inp->inp_refcount, 1);   /* Reference from inpcbinfo */
 322         INP_LIST_WUNLOCK(pcbinfo);
 323 #if defined(IPSEC) || defined(MAC)
 324 out:
 325         if (error != 0) {
 326                 crfree(inp->inp_cred);
 327                 uma_zfree(pcbinfo->ipi_zone, inp);
 328         }
 329 #endif
 330         return (error);
 331 }
 332
 333 #ifdef INET
 334 int
 335 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 336 {
 337         int anonport, error;
 338
 339         INP_WLOCK_ASSERT(inp);
 340         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 341
 342         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 343                 return (EINVAL);
 344         anonport = nam == NULL || ((struct sockaddr_in *)nam)->sin_port == 0;
 345         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 346             &inp->inp_lport, cred);
 347         if (error)
 348                 return (error);
 349         if (in_pcbinshash(inp) != 0) {
 350                 inp->inp_laddr.s_addr = INADDR_ANY;
 351                 inp->inp_lport = 0;
 352                 return (EAGAIN);
 353         }
 354         if (anonport)
 355                 inp->inp_flags |= INP_ANONPORT;
 356         return (0);
 357 }
 358 #endif
 359
 360 #if defined(INET) || defined(INET6)
 361 int
 362 in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp,
 363     struct ucred *cred, int lookupflags)
 364 {
 365         struct inpcbinfo *pcbinfo;
 366         struct inpcb *tmpinp;
 367         unsigned short *lastport;
 368         int count, dorandom, error;
 369         u_short aux, first, last, lport;
 370 #ifdef INET
 371         struct in_addr laddr;
 372 #endif
 373
 374         pcbinfo = inp->inp_pcbinfo;
 375
 376         /*
 377          * Because no actual state changes occur here, a global write lock on
 378          * the pcbinfo isn't required.
 379          */
 380         INP_LOCK_ASSERT(inp);
 381         INP_HASH_LOCK_ASSERT(pcbinfo);
 382
 383         if (inp->inp_flags & INP_HIGHPORT) {
 384                 first = V_ipport_hifirstauto;   /* sysctl */
 385                 last  = V_ipport_hilastauto;
 386                 lastport = &pcbinfo->ipi_lasthi;
 387         } else if (inp->inp_flags & INP_LOWPORT) {
 388                 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
 389                 if (error)
 390                         return (error);
 391                 first = V_ipport_lowfirstauto;  /* 1023 */
 392                 last  = V_ipport_lowlastauto;   /* 600 */
 393                 lastport = &pcbinfo->ipi_lastlow;
 394         } else {
 395                 first = V_ipport_firstauto;     /* sysctl */
 396                 last  = V_ipport_lastauto;
 397                 lastport = &pcbinfo->ipi_lastport;
 398         }
 399         /*
 400          * For UDP(-Lite), use random port allocation as long as the user
 401          * allows it.  For TCP (and as of yet unknown) connections,
 402          * use random port allocation only if the user allows it AND
 403          * ipport_tick() allows it.
 404          */
 405         if (V_ipport_randomized &&
 406                 (!V_ipport_stoprandom || pcbinfo == &V_udbinfo ||
 407                 pcbinfo == &V_ulitecbinfo))
 408                 dorandom = 1;
 409         else
 410                 dorandom = 0;
 411         /*
 412          * It makes no sense to do random port allocation if
 413          * we have the only port available.
 414          */
 415         if (first == last)
 416                 dorandom = 0;
 417         /* Make sure to not include UDP(-Lite) packets in the count. */
 418         if (pcbinfo != &V_udbinfo || pcbinfo != &V_ulitecbinfo)
 419                 V_ipport_tcpallocs++;
 420         /*
 421          * Instead of having two loops further down counting up or down
 422          * make sure that first is always <= last and go with only one
 423          * code path implementing all logic.
 424          */
 425         if (first > last) {
 426                 aux = first;
 427                 first = last;
 428                 last = aux;
 429         }
 430
 431 #ifdef INET
 432         /* Make the compiler happy. */
 433         laddr.s_addr = 0;
 434         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) {
 435                 KASSERT(laddrp != NULL, ("%s: laddrp NULL for v4 inp %p",
 436                     __func__, inp));
 437                 laddr = *laddrp;
 438         }
 439 #endif
 440         tmpinp = NULL;  /* Make compiler happy. */
 441         lport = *lportp;
 442
 443         if (dorandom)
 444                 *lastport = first + (arc4random() % (last - first));
 445
 446         count = last - first;
 447
 448         do {
 449                 if (count-- < 0)        /* completely used? */
 450                         return (EADDRNOTAVAIL);
 451                 ++*lastport;
 452                 if (*lastport < first || *lastport > last)
 453                         *lastport = first;
 454                 lport = htons(*lastport);
 455
 456 #ifdef INET6
 457                 if ((inp->inp_vflag & INP_IPV6) != 0)
 458                         tmpinp = in6_pcblookup_local(pcbinfo,
 459                             &inp->in6p_laddr, lport, lookupflags, cred);
 460 #endif
 461 #if defined(INET) && defined(INET6)
 462                 else
 463 #endif
 464 #ifdef INET
 465                         tmpinp = in_pcblookup_local(pcbinfo, laddr,
 466                             lport, lookupflags, cred);
 467 #endif
 468         } while (tmpinp != NULL);
 469
 470 #ifdef INET
 471         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4)
 472                 laddrp->s_addr = laddr.s_addr;
 473 #endif
 474         *lportp = lport;
 475
 476         return (0);
 477 }
 478
 479 /*
 480  * Return cached socket options.
 481  */
 482 short
 483 inp_so_options(const struct inpcb *inp)
 484 {
 485    short so_options;
 486
 487    so_options = 0;
 488
 489    if ((inp->inp_flags2 & INP_REUSEPORT) != 0)
 490            so_options |= SO_REUSEPORT;
 491    if ((inp->inp_flags2 & INP_REUSEADDR) != 0)
 492            so_options |= SO_REUSEADDR;
 493    return (so_options);
 494 }
 495 #endif /* INET || INET6 */
 496
 497 #ifdef INET
 498 /*
 499  * Set up a bind operation on a PCB, performing port allocation
 500  * as required, but do not actually modify the PCB. Callers can
 501  * either complete the bind by setting inp_laddr/inp_lport and
 502  * calling in_pcbinshash(), or they can just use the resulting
 503  * port and address to authorise the sending of a once-off packet.
 504  *
 505  * On error, the values of *laddrp and *lportp are not changed.
 506  */
 507 int
 508 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 509     u_short *lportp, struct ucred *cred)
 510 {
 511         struct socket *so = inp->inp_socket;
 512         struct sockaddr_in *sin;
 513         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 514         struct in_addr laddr;
 515         u_short lport = 0;
 516         int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT);
 517         int error;
 518
 519         /*
 520          * No state changes, so read locks are sufficient here.
 521          */
 522         INP_LOCK_ASSERT(inp);
 523         INP_HASH_LOCK_ASSERT(pcbinfo);
 524
 525         if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
 526                 return (EADDRNOTAVAIL);
 527         laddr.s_addr = *laddrp;
 528         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 529                 return (EINVAL);
 530         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 531                 lookupflags = INPLOOKUP_WILDCARD;
 532         if (nam == NULL) {
 533                 if ((error = prison_local_ip4(cred, &laddr)) != 0)
 534                         return (error);
 535         } else {
 536                 sin = (struct sockaddr_in *)nam;
 537                 if (nam->sa_len != sizeof (*sin))
 538                         return (EINVAL);
 539 #ifdef notdef
 540                 /*
 541                  * We should check the family, but old programs
 542                  * incorrectly fail to initialize it.
 543                  */
 544                 if (sin->sin_family != AF_INET)
 545                         return (EAFNOSUPPORT);
 546 #endif
 547                 error = prison_local_ip4(cred, &sin->sin_addr);
 548                 if (error)
 549                         return (error);
 550                 if (sin->sin_port != *lportp) {
 551                         /* Don't allow the port to change. */
 552                         if (*lportp != 0)
 553                                 return (EINVAL);
 554                         lport = sin->sin_port;
 555                 }
 556                 /* NB: lport is left as 0 if the port isn't being changed. */
 557                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 558                         /*
 559                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 560                          * allow complete duplication of binding if
 561                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 562                          * and a multicast address is bound on both
 563                          * new and duplicated sockets.
 564                          */
 565                         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
 566                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 567                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 568                         sin->sin_port = 0;              /* yech... */
 569                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 570                         /*
 571                          * Is the address a local IP address?
 572                          * If INP_BINDANY is set, then the socket may be bound
 573                          * to any endpoint address, local or not.
 574                          */
 575                         if ((inp->inp_flags & INP_BINDANY) == 0 &&
 576                             ifa_ifwithaddr_check((struct sockaddr *)sin) == 0)
 577                                 return (EADDRNOTAVAIL);
 578                 }
 579                 laddr = sin->sin_addr;
 580                 if (lport) {
 581                         struct inpcb *t;
 582                         struct tcptw *tw;
 583
 584                         /* GROSS */
 585                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 586                             ntohs(lport) >= V_ipport_reservedlow &&
 587                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 588                             0))
 589                                 return (EACCES);
 590                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 591                             priv_check_cred(inp->inp_cred,
 592                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 593                                 t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 594                                     lport, INPLOOKUP_WILDCARD, cred);
 595         /*
 596          * XXX
 597          * This entire block sorely needs a rewrite.
 598          */
 599                                 if (t &&
 600                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 601                                     (so->so_type != SOCK_STREAM ||
 602                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
 603                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
 604                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 605                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
 606                                     (inp->inp_cred->cr_uid !=
 607                                      t->inp_cred->cr_uid))
 608                                         return (EADDRINUSE);
 609                         }
 610                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 611                             lport, lookupflags, cred);
 612                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 613                                 /*
 614                                  * XXXRW: If an incpb has had its timewait
 615                                  * state recycled, we treat the address as
 616                                  * being in use (for now).  This is better
 617                                  * than a panic, but not desirable.
 618                                  */
 619                                 tw = intotw(t);
 620                                 if (tw == NULL ||
 621                                     (reuseport & tw->tw_so_options) == 0)
 622                                         return (EADDRINUSE);
 623                         } else if (t && (reuseport & inp_so_options(t)) == 0) {
 624 #ifdef INET6
 625                                 if (ntohl(sin->sin_addr.s_addr) !=
 626                                     INADDR_ANY ||
 627                                     ntohl(t->inp_laddr.s_addr) !=
 628                                     INADDR_ANY ||
 629                                     (inp->inp_vflag & INP_IPV6PROTO) == 0 ||
 630                                     (t->inp_vflag & INP_IPV6PROTO) == 0)
 631 #endif
 632                                 return (EADDRINUSE);
 633                         }
 634                 }
 635         }
 636         if (*lportp != 0)
 637                 lport = *lportp;
 638         if (lport == 0) {
 639                 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags);
 640                 if (error != 0)
 641                         return (error);
 642
 643         }
 644         *laddrp = laddr.s_addr;
 645         *lportp = lport;
 646         return (0);
 647 }
 648
 649 /*
 650  * Connect from a socket to a specified address.
 651  * Both address and port must be specified in argument sin.
 652  * If don't have a local address for this socket yet,
 653  * then pick one.
 654  */
 655 int
 656 in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
 657     struct ucred *cred, struct mbuf *m)
 658 {
 659         u_short lport, fport;
 660         in_addr_t laddr, faddr;
 661         int anonport, error;
 662
 663         INP_WLOCK_ASSERT(inp);
 664         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 665
 666         lport = inp->inp_lport;
 667         laddr = inp->inp_laddr.s_addr;
 668         anonport = (lport == 0);
 669         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 670             NULL, cred);
 671         if (error)
 672                 return (error);
 673
 674         /* Do the initial binding of the local address if required. */
 675         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 676                 inp->inp_lport = lport;
 677                 inp->inp_laddr.s_addr = laddr;
 678                 if (in_pcbinshash(inp) != 0) {
 679                         inp->inp_laddr.s_addr = INADDR_ANY;
 680                         inp->inp_lport = 0;
 681                         return (EAGAIN);
 682                 }
 683         }
 684
 685         /* Commit the remaining changes. */
 686         inp->inp_lport = lport;
 687         inp->inp_laddr.s_addr = laddr;
 688         inp->inp_faddr.s_addr = faddr;
 689         inp->inp_fport = fport;
 690         in_pcbrehash_mbuf(inp, m);
 691
 692         if (anonport)
 693                 inp->inp_flags |= INP_ANONPORT;
 694         return (0);
 695 }
 696
 697 int
 698 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 699 {
 700
 701         return (in_pcbconnect_mbuf(inp, nam, cred, NULL));
 702 }
 703
 704 /*
 705  * Do proper source address selection on an unbound socket in case
 706  * of connect. Take jails into account as well.
 707  */
 708 int
 709 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
 710     struct ucred *cred)
 711 {
 712         struct ifaddr *ifa;
 713         struct sockaddr *sa;
 714         struct sockaddr_in *sin;
 715         struct route sro;
 716         int error;
 717
 718         KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
 719
 720         /*
 721          * Bypass source address selection and use the primary jail IP
 722          * if requested.
 723          */
 724         if (cred != NULL && !prison_saddrsel_ip4(cred, laddr))
 725                 return (0);
 726
 727         error = 0;
 728         bzero(&sro, sizeof(sro));
 729
 730         sin = (struct sockaddr_in *)&sro.ro_dst;
 731         sin->sin_family = AF_INET;
 732         sin->sin_len = sizeof(struct sockaddr_in);
 733         sin->sin_addr.s_addr = faddr->s_addr;
 734
 735         /*
 736          * If route is known our src addr is taken from the i/f,
 737          * else punt.
 738          *
 739          * Find out route to destination.
 740          */
 741         if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 742                 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
 743
 744         /*
 745          * If we found a route, use the address corresponding to
 746          * the outgoing interface.
 747          *
 748          * Otherwise assume faddr is reachable on a directly connected
 749          * network and try to find a corresponding interface to take
 750          * the source address from.
 751          */
 752         if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
 753                 struct in_ifaddr *ia;
 754                 struct ifnet *ifp;
 755
 756                 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin));
 757                 if (ia == NULL)
 758                         ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0));
 759                 if (ia == NULL) {
 760                         error = ENETUNREACH;
 761                         goto done;
 762                 }
 763
 764                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 765                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 766                         ifa_free(&ia->ia_ifa);
 767                         goto done;
 768                 }
 769
 770                 ifp = ia->ia_ifp;
 771                 ifa_free(&ia->ia_ifa);
 772                 ia = NULL;
 773                 IF_ADDR_RLOCK(ifp);
 774                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 775
 776                         sa = ifa->ifa_addr;
 777                         if (sa->sa_family != AF_INET)
 778                                 continue;
 779                         sin = (struct sockaddr_in *)sa;
 780                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 781                                 ia = (struct in_ifaddr *)ifa;
 782                                 break;
 783                         }
 784                 }
 785                 if (ia != NULL) {
 786                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 787                         IF_ADDR_RUNLOCK(ifp);
 788                         goto done;
 789                 }
 790                 IF_ADDR_RUNLOCK(ifp);
 791
 792                 /* 3. As a last resort return the 'default' jail address. */
 793                 error = prison_get_ip4(cred, laddr);
 794                 goto done;
 795         }
 796
 797         /*
 798          * If the outgoing interface on the route found is not
 799          * a loopback interface, use the address from that interface.
 800          * In case of jails do those three steps:
 801          * 1. check if the interface address belongs to the jail. If so use it.
 802          * 2. check if we have any address on the outgoing interface
 803          *    belonging to this jail. If so use it.
 804          * 3. as a last resort return the 'default' jail address.
 805          */
 806         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
 807                 struct in_ifaddr *ia;
 808                 struct ifnet *ifp;
 809
 810                 /* If not jailed, use the default returned. */
 811                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 812                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 813                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 814                         goto done;
 815                 }
 816
 817                 /* Jailed. */
 818                 /* 1. Check if the iface address belongs to the jail. */
 819                 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
 820                 if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 821                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 822                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 823                         goto done;
 824                 }
 825
 826                 /*
 827                  * 2. Check if we have any address on the outgoing interface
 828                  *    belonging to this jail.
 829                  */
 830                 ia = NULL;
 831                 ifp = sro.ro_rt->rt_ifp;
 832                 IF_ADDR_RLOCK(ifp);
 833                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 834                         sa = ifa->ifa_addr;
 835                         if (sa->sa_family != AF_INET)
 836                                 continue;
 837                         sin = (struct sockaddr_in *)sa;
 838                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 839                                 ia = (struct in_ifaddr *)ifa;
 840                                 break;
 841                         }
 842                 }
 843                 if (ia != NULL) {
 844                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 845                         IF_ADDR_RUNLOCK(ifp);
 846                         goto done;
 847                 }
 848                 IF_ADDR_RUNLOCK(ifp);
 849
 850                 /* 3. As a last resort return the 'default' jail address. */
 851                 error = prison_get_ip4(cred, laddr);
 852                 goto done;
 853         }
 854
 855         /*
 856          * The outgoing interface is marked with 'loopback net', so a route
 857          * to ourselves is here.
 858          * Try to find the interface of the destination address and then
 859          * take the address from there. That interface is not necessarily
 860          * a loopback interface.
 861          * In case of jails, check that it is an address of the jail
 862          * and if we cannot find, fall back to the 'default' jail address.
 863          */
 864         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
 865                 struct sockaddr_in sain;
 866                 struct in_ifaddr *ia;
 867
 868                 bzero(&sain, sizeof(struct sockaddr_in));
 869                 sain.sin_family = AF_INET;
 870                 sain.sin_len = sizeof(struct sockaddr_in);
 871                 sain.sin_addr.s_addr = faddr->s_addr;
 872
 873                 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain)));
 874                 if (ia == NULL)
 875                         ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0));
 876                 if (ia == NULL)
 877                         ia = ifatoia(ifa_ifwithaddr(sintosa(&sain)));
 878
 879                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 880                         if (ia == NULL) {
 881                                 error = ENETUNREACH;
 882                                 goto done;
 883                         }
 884                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 885                         ifa_free(&ia->ia_ifa);
 886                         goto done;
 887                 }
 888
 889                 /* Jailed. */
 890                 if (ia != NULL) {
 891                         struct ifnet *ifp;
 892
 893                         ifp = ia->ia_ifp;
 894                         ifa_free(&ia->ia_ifa);
 895                         ia = NULL;
 896                         IF_ADDR_RLOCK(ifp);
 897                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 898
 899                                 sa = ifa->ifa_addr;
 900                                 if (sa->sa_family != AF_INET)
 901                                         continue;
 902                                 sin = (struct sockaddr_in *)sa;
 903                                 if (prison_check_ip4(cred,
 904                                     &sin->sin_addr) == 0) {
 905                                         ia = (struct in_ifaddr *)ifa;
 906                                         break;
 907                                 }
 908                         }
 909                         if (ia != NULL) {
 910                                 laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 911                                 IF_ADDR_RUNLOCK(ifp);
 912                                 goto done;
 913                         }
 914                         IF_ADDR_RUNLOCK(ifp);
 915                 }
 916
 917                 /* 3. As a last resort return the 'default' jail address. */
 918                 error = prison_get_ip4(cred, laddr);
 919                 goto done;
 920         }
 921
 922 done:
 923         if (sro.ro_rt != NULL)
 924                 RTFREE(sro.ro_rt);
 925         return (error);
 926 }
 927
 928 /*
 929  * Set up for a connect from a socket to the specified address.
 930  * On entry, *laddrp and *lportp should contain the current local
 931  * address and port for the PCB; these are updated to the values
 932  * that should be placed in inp_laddr and inp_lport to complete
 933  * the connect.
 934  *
 935  * On success, *faddrp and *fportp will be set to the remote address
 936  * and port. These are not updated in the error case.
 937  *
 938  * If the operation fails because the connection already exists,
 939  * *oinpp will be set to the PCB of that connection so that the
 940  * caller can decide to override it. In all other cases, *oinpp
 941  * is set to NULL.
 942  */
 943 int
 944 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
 945     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
 946     struct inpcb **oinpp, struct ucred *cred)
 947 {
 948         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 949         struct in_ifaddr *ia;
 950         struct inpcb *oinp;
 951         struct in_addr laddr, faddr;
 952         u_short lport, fport;
 953         int error;
 954
 955         /*
 956          * Because a global state change doesn't actually occur here, a read
 957          * lock is sufficient.
 958          */
 959         INP_LOCK_ASSERT(inp);
 960         INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo);
 961
 962         if (oinpp != NULL)
 963                 *oinpp = NULL;
 964         if (nam->sa_len != sizeof (*sin))
 965                 return (EINVAL);
 966         if (sin->sin_family != AF_INET)
 967                 return (EAFNOSUPPORT);
 968         if (sin->sin_port == 0)
 969                 return (EADDRNOTAVAIL);
 970         laddr.s_addr = *laddrp;
 971         lport = *lportp;
 972         faddr = sin->sin_addr;
 973         fport = sin->sin_port;
 974
 975         if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
 976                 /*
 977                  * If the destination address is INADDR_ANY,
 978                  * use the primary local address.
 979                  * If the supplied address is INADDR_BROADCAST,
 980                  * and the primary interface supports broadcast,
 981                  * choose the broadcast address for that interface.
 982                  */
 983                 if (faddr.s_addr == INADDR_ANY) {
 984                         IN_IFADDR_RLOCK();
 985                         faddr =
 986                             IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
 987                         IN_IFADDR_RUNLOCK();
 988                         if (cred != NULL &&
 989                             (error = prison_get_ip4(cred, &faddr)) != 0)
 990                                 return (error);
 991                 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
 992                         IN_IFADDR_RLOCK();
 993                         if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
 994                             IFF_BROADCAST)
 995                                 faddr = satosin(&TAILQ_FIRST(
 996                                     &V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
 997                         IN_IFADDR_RUNLOCK();
 998                 }
 999         }
1000         if (laddr.s_addr == INADDR_ANY) {
1001                 error = in_pcbladdr(inp, &faddr, &laddr, cred);
1002                 /*
1003                  * If the destination address is multicast and an outgoing
1004                  * interface has been set as a multicast option, prefer the
1005                  * address of that interface as our source address.
1006                  */
1007                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
1008                     inp->inp_moptions != NULL) {
1009                         struct ip_moptions *imo;
1010                         struct ifnet *ifp;
1011
1012                         imo = inp->inp_moptions;
1013                         if (imo->imo_multicast_ifp != NULL) {
1014                                 ifp = imo->imo_multicast_ifp;
1015                                 IN_IFADDR_RLOCK();
1016                                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1017                                         if ((ia->ia_ifp == ifp) &&
1018                                             (cred == NULL ||
1019                                             prison_check_ip4(cred,
1020                                             &ia->ia_addr.sin_addr) == 0))
1021                                                 break;
1022                                 }
1023                                 if (ia == NULL)
1024                                         error = EADDRNOTAVAIL;
1025                                 else {
1026                                         laddr = ia->ia_addr.sin_addr;
1027                                         error = 0;
1028                                 }
1029                                 IN_IFADDR_RUNLOCK();
1030                         }
1031                 }
1032                 if (error)
1033                         return (error);
1034         }
1035         oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, fport,
1036             laddr, lport, 0, NULL);
1037         if (oinp != NULL) {
1038                 if (oinpp != NULL)
1039                         *oinpp = oinp;
1040                 return (EADDRINUSE);
1041         }
1042         if (lport == 0) {
1043                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
1044                     cred);
1045                 if (error)
1046                         return (error);
1047         }
1048         *laddrp = laddr.s_addr;
1049         *lportp = lport;
1050         *faddrp = faddr.s_addr;
1051         *fportp = fport;
1052         return (0);
1053 }
1054
1055 void
1056 in_pcbdisconnect(struct inpcb *inp)
1057 {
1058
1059         INP_WLOCK_ASSERT(inp);
1060         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
1061
1062         inp->inp_faddr.s_addr = INADDR_ANY;
1063         inp->inp_fport = 0;
1064         in_pcbrehash(inp);
1065 }
1066 #endif /* INET */
1067
1068 /*
1069  * in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
1070  * For most protocols, this will be invoked immediately prior to calling
1071  * in_pcbfree().  However, with TCP the inpcb may significantly outlive the
1072  * socket, in which case in_pcbfree() is deferred.
1073  */
1074 void
1075 in_pcbdetach(struct inpcb *inp)
1076 {
1077
1078         KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
1079
1080         inp->inp_socket->so_pcb = NULL;
1081         inp->inp_socket = NULL;
1082 }
1083
1084 /*
1085  * in_pcbref() bumps the reference count on an inpcb in order to maintain
1086  * stability of an inpcb pointer despite the inpcb lock being released.  This
1087  * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
1088  * but where the inpcb lock may already held, or when acquiring a reference
1089  * via a pcbgroup.
1090  *
1091  * in_pcbref() should be used only to provide brief memory stability, and
1092  * must always be followed by a call to INP_WLOCK() and in_pcbrele() to
1093  * garbage collect the inpcb if it has been in_pcbfree()'d from another
1094  * context.  Until in_pcbrele() has returned that the inpcb is still valid,
1095  * lock and rele are the *only* safe operations that may be performed on the
1096  * inpcb.
1097  *
1098  * While the inpcb will not be freed, releasing the inpcb lock means that the
1099  * connection's state may change, so the caller should be careful to
1100  * revalidate any cached state on reacquiring the lock.  Drop the reference
1101  * using in_pcbrele().
1102  */
1103 void
1104 in_pcbref(struct inpcb *inp)
1105 {
1106
1107         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1108
1109         refcount_acquire(&inp->inp_refcount);
1110 }
1111
1112 /*
1113  * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
1114  * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
1115  * return a flag indicating whether or not the inpcb remains valid.  If it is
1116  * valid, we return with the inpcb lock held.
1117  *
1118  * Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a
1119  * reference on an inpcb.  Historically more work was done here (actually, in
1120  * in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the
1121  * need for the pcbinfo lock in in_pcbrele().  Deferring the free is entirely
1122  * about memory stability (and continued use of the write lock).
1123  */
1124 int
1125 in_pcbrele_rlocked(struct inpcb *inp)
1126 {
1127         struct inpcbinfo *pcbinfo;
1128
1129         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1130
1131         INP_RLOCK_ASSERT(inp);
1132
1133         if (refcount_release(&inp->inp_refcount) == 0) {
1134                 /*
1135                  * If the inpcb has been freed, let the caller know, even if
1136                  * this isn't the last reference.
1137                  */
1138                 if (inp->inp_flags2 & INP_FREED) {
1139                         INP_RUNLOCK(inp);
1140                         return (1);
1141                 }
1142                 return (0);
1143         }
1144
1145         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1146
1147         INP_RUNLOCK(inp);
1148         pcbinfo = inp->inp_pcbinfo;
1149         uma_zfree(pcbinfo->ipi_zone, inp);
1150         return (1);
1151 }
1152
1153 int
1154 in_pcbrele_wlocked(struct inpcb *inp)
1155 {
1156         struct inpcbinfo *pcbinfo;
1157
1158         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1159
1160         INP_WLOCK_ASSERT(inp);
1161
1162         if (refcount_release(&inp->inp_refcount) == 0) {
1163                 /*
1164                  * If the inpcb has been freed, let the caller know, even if
1165                  * this isn't the last reference.
1166                  */
1167                 if (inp->inp_flags2 & INP_FREED) {
1168                         INP_WUNLOCK(inp);
1169                         return (1);
1170                 }
1171                 return (0);
1172         }
1173
1174         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1175
1176         INP_WUNLOCK(inp);
1177         pcbinfo = inp->inp_pcbinfo;
1178         uma_zfree(pcbinfo->ipi_zone, inp);
1179         return (1);
1180 }
1181
1182 /*
1183  * Temporary wrapper.
1184  */
1185 int
1186 in_pcbrele(struct inpcb *inp)
1187 {
1188
1189         return (in_pcbrele_wlocked(inp));
1190 }
1191
1192 /*
1193  * Unconditionally schedule an inpcb to be freed by decrementing its
1194  * reference count, which should occur only after the inpcb has been detached
1195  * from its socket.  If another thread holds a temporary reference (acquired
1196  * using in_pcbref()) then the free is deferred until that reference is
1197  * released using in_pcbrele(), but the inpcb is still unlocked.  Almost all
1198  * work, including removal from global lists, is done in this context, where
1199  * the pcbinfo lock is held.
1200  */
1201 void
1202 in_pcbfree(struct inpcb *inp)
1203 {
1204         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1205
1206         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1207
1208 #ifdef INVARIANTS
1209         if (pcbinfo == &V_tcbinfo) {
1210                 INP_INFO_LOCK_ASSERT(pcbinfo);
1211         } else {
1212                 INP_INFO_WLOCK_ASSERT(pcbinfo);
1213         }
1214 #endif
1215         INP_WLOCK_ASSERT(inp);
1216
1217         /* XXXRW: Do as much as possible here. */
1218 #ifdef IPSEC
1219         if (inp->inp_sp != NULL)
1220                 ipsec_delete_pcbpolicy(inp);
1221 #endif
1222         INP_LIST_WLOCK(pcbinfo);
1223         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1224         in_pcbremlists(inp);
1225         INP_LIST_WUNLOCK(pcbinfo);
1226 #ifdef INET6
1227         if (inp->inp_vflag & INP_IPV6PROTO) {
1228                 ip6_freepcbopts(inp->in6p_outputopts);
1229                 if (inp->in6p_moptions != NULL)
1230                         ip6_freemoptions(inp->in6p_moptions);
1231         }
1232 #endif
1233         if (inp->inp_options)
1234                 (void)m_free(inp->inp_options);
1235 #ifdef INET
1236         if (inp->inp_moptions != NULL)
1237                 inp_freemoptions(inp->inp_moptions);
1238 #endif
1239         inp->inp_vflag = 0;
1240         inp->inp_flags2 |= INP_FREED;
1241         crfree(inp->inp_cred);
1242 #ifdef MAC
1243         mac_inpcb_destroy(inp);
1244 #endif
1245         if (!in_pcbrele_wlocked(inp))
1246                 INP_WUNLOCK(inp);
1247 }
1248
1249 /*
1250  * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
1251  * port reservation, and preventing it from being returned by inpcb lookups.
1252  *
1253  * It is used by TCP to mark an inpcb as unused and avoid future packet
1254  * delivery or event notification when a socket remains open but TCP has
1255  * closed.  This might occur as a result of a shutdown()-initiated TCP close
1256  * or a RST on the wire, and allows the port binding to be reused while still
1257  * maintaining the invariant that so_pcb always points to a valid inpcb until
1258  * in_pcbdetach().
1259  *
1260  * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
1261  * in_pcbnotifyall() and in_pcbpurgeif0()?
1262  */
1263 void
1264 in_pcbdrop(struct inpcb *inp)
1265 {
1266
1267         INP_WLOCK_ASSERT(inp);
1268
1269         /*
1270          * XXXRW: Possibly we should protect the setting of INP_DROPPED with
1271          * the hash lock...?
1272          */
1273         inp->inp_flags |= INP_DROPPED;
1274         if (inp->inp_flags & INP_INHASHLIST) {
1275                 struct inpcbport *phd = inp->inp_phd;
1276
1277                 INP_HASH_WLOCK(inp->inp_pcbinfo);
1278                 LIST_REMOVE(inp, inp_hash);
1279                 LIST_REMOVE(inp, inp_portlist);
1280                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1281                         LIST_REMOVE(phd, phd_hash);
1282                         free(phd, M_PCB);
1283                 }
1284                 INP_HASH_WUNLOCK(inp->inp_pcbinfo);
1285                 inp->inp_flags &= ~INP_INHASHLIST;
1286 #ifdef PCBGROUP
1287                 in_pcbgroup_remove(inp);
1288 #endif
1289         }
1290 }
1291
1292 #ifdef INET
1293 /*
1294  * Common routines to return the socket addresses associated with inpcbs.
1295  */
1296 struct sockaddr *
1297 in_sockaddr(in_port_t port, struct in_addr *addr_p)
1298 {
1299         struct sockaddr_in *sin;
1300
1301         sin = malloc(sizeof *sin, M_SONAME,
1302                 M_WAITOK | M_ZERO);
1303         sin->sin_family = AF_INET;
1304         sin->sin_len = sizeof(*sin);
1305         sin->sin_addr = *addr_p;
1306         sin->sin_port = port;
1307
1308         return (struct sockaddr *)sin;
1309 }
1310
1311 int
1312 in_getsockaddr(struct socket *so, struct sockaddr **nam)
1313 {
1314         struct inpcb *inp;
1315         struct in_addr addr;
1316         in_port_t port;
1317
1318         inp = sotoinpcb(so);
1319         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
1320
1321         INP_RLOCK(inp);
1322         port = inp->inp_lport;
1323         addr = inp->inp_laddr;
1324         INP_RUNLOCK(inp);
1325
1326         *nam = in_sockaddr(port, &addr);
1327         return 0;
1328 }
1329
1330 int
1331 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
1332 {
1333         struct inpcb *inp;
1334         struct in_addr addr;
1335         in_port_t port;
1336
1337         inp = sotoinpcb(so);
1338         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
1339
1340         INP_RLOCK(inp);
1341         port = inp->inp_fport;
1342         addr = inp->inp_faddr;
1343         INP_RUNLOCK(inp);
1344
1345         *nam = in_sockaddr(port, &addr);
1346         return 0;
1347 }
1348
1349 void
1350 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
1351     struct inpcb *(*notify)(struct inpcb *, int))
1352 {
1353         struct inpcb *inp, *inp_temp;
1354
1355         INP_INFO_WLOCK(pcbinfo);
1356         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
1357                 INP_WLOCK(inp);
1358 #ifdef INET6
1359                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1360                         INP_WUNLOCK(inp);
1361                         continue;
1362                 }
1363 #endif
1364                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1365                     inp->inp_socket == NULL) {
1366                         INP_WUNLOCK(inp);
1367                         continue;
1368                 }
1369                 if ((*notify)(inp, errno))
1370                         INP_WUNLOCK(inp);
1371         }
1372         INP_INFO_WUNLOCK(pcbinfo);
1373 }
1374
1375 void
1376 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
1377 {
1378         struct inpcb *inp;
1379         struct ip_moptions *imo;
1380         int i, gap;
1381
1382         INP_INFO_WLOCK(pcbinfo);
1383         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
1384                 INP_WLOCK(inp);
1385                 imo = inp->inp_moptions;
1386                 if ((inp->inp_vflag & INP_IPV4) &&
1387                     imo != NULL) {
1388                         /*
1389                          * Unselect the outgoing interface if it is being
1390                          * detached.
1391                          */
1392                         if (imo->imo_multicast_ifp == ifp)
1393                                 imo->imo_multicast_ifp = NULL;
1394
1395                         /*
1396                          * Drop multicast group membership if we joined
1397                          * through the interface being detached.
1398                          */
1399                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1400                             i++) {
1401                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1402                                         in_delmulti(imo->imo_membership[i]);
1403                                         gap++;
1404                                 } else if (gap != 0)
1405                                         imo->imo_membership[i - gap] =
1406                                             imo->imo_membership[i];
1407                         }
1408                         imo->imo_num_memberships -= gap;
1409                 }
1410                 INP_WUNLOCK(inp);
1411         }
1412         INP_INFO_WUNLOCK(pcbinfo);
1413 }
1414
1415 /*
1416  * Lookup a PCB based on the local address and port.  Caller must hold the
1417  * hash lock.  No inpcb locks or references are acquired.
1418  */
1419 #define INP_LOOKUP_MAPPED_PCB_COST      3
1420 struct inpcb *
1421 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
1422     u_short lport, int lookupflags, struct ucred *cred)
1423 {
1424         struct inpcb *inp;
1425 #ifdef INET6
1426         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
1427 #else
1428         int matchwild = 3;
1429 #endif
1430         int wildcard;
1431
1432         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1433             ("%s: invalid lookup flags %d", __func__, lookupflags));
1434
1435         INP_HASH_LOCK_ASSERT(pcbinfo);
1436
1437         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
1438                 struct inpcbhead *head;
1439                 /*
1440                  * Look for an unconnected (wildcard foreign addr) PCB that
1441                  * matches the local address and port we're looking for.
1442                  */
1443                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1444                     0, pcbinfo->ipi_hashmask)];
1445                 LIST_FOREACH(inp, head, inp_hash) {
1446 #ifdef INET6
1447                         /* XXX inp locking */
1448                         if ((inp->inp_vflag & INP_IPV4) == 0)
1449                                 continue;
1450 #endif
1451                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1452                             inp->inp_laddr.s_addr == laddr.s_addr &&
1453                             inp->inp_lport == lport) {
1454                                 /*
1455                                  * Found?
1456                                  */
1457                                 if (cred == NULL ||
1458                                     prison_equal_ip4(cred->cr_prison,
1459                                         inp->inp_cred->cr_prison))
1460                                         return (inp);
1461                         }
1462                 }
1463                 /*
1464                  * Not found.
1465                  */
1466                 return (NULL);
1467         } else {
1468                 struct inpcbporthead *porthash;
1469                 struct inpcbport *phd;
1470                 struct inpcb *match = NULL;
1471                 /*
1472                  * Best fit PCB lookup.
1473                  *
1474                  * First see if this local port is in use by looking on the
1475                  * port hash list.
1476                  */
1477                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
1478                     pcbinfo->ipi_porthashmask)];
1479                 LIST_FOREACH(phd, porthash, phd_hash) {
1480                         if (phd->phd_port == lport)
1481                                 break;
1482                 }
1483                 if (phd != NULL) {
1484                         /*
1485                          * Port is in use by one or more PCBs. Look for best
1486                          * fit.
1487                          */
1488                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1489                                 wildcard = 0;
1490                                 if (cred != NULL &&
1491                                     !prison_equal_ip4(inp->inp_cred->cr_prison,
1492                                         cred->cr_prison))
1493                                         continue;
1494 #ifdef INET6
1495                                 /* XXX inp locking */
1496                                 if ((inp->inp_vflag & INP_IPV4) == 0)
1497                                         continue;
1498                                 /*
1499                                  * We never select the PCB that has
1500                                  * INP_IPV6 flag and is bound to :: if
1501                                  * we have another PCB which is bound
1502                                  * to 0.0.0.0.  If a PCB has the
1503                                  * INP_IPV6 flag, then we set its cost
1504                                  * higher than IPv4 only PCBs.
1505                                  *
1506                                  * Note that the case only happens
1507                                  * when a socket is bound to ::, under
1508                                  * the condition that the use of the
1509                                  * mapped address is allowed.
1510                                  */
1511                                 if ((inp->inp_vflag & INP_IPV6) != 0)
1512                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
1513 #endif
1514                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
1515                                         wildcard++;
1516                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
1517                                         if (laddr.s_addr == INADDR_ANY)
1518                                                 wildcard++;
1519                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
1520                                                 continue;
1521                                 } else {
1522                                         if (laddr.s_addr != INADDR_ANY)
1523                                                 wildcard++;
1524                                 }
1525                                 if (wildcard < matchwild) {
1526                                         match = inp;
1527                                         matchwild = wildcard;
1528                                         if (matchwild == 0)
1529                                                 break;
1530                                 }
1531                         }
1532                 }
1533                 return (match);
1534         }
1535 }
1536 #undef INP_LOOKUP_MAPPED_PCB_COST
1537
1538 #ifdef PCBGROUP
1539 /*
1540  * Lookup PCB in hash list, using pcbgroup tables.
1541  */
1542 static struct inpcb *
1543 in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
1544     struct in_addr faddr, u_int fport_arg, struct in_addr laddr,
1545     u_int lport_arg, int lookupflags, struct ifnet *ifp)
1546 {
1547         struct inpcbhead *head;
1548         struct inpcb *inp, *tmpinp;
1549         u_short fport = fport_arg, lport = lport_arg;
1550
1551         /*
1552          * First look for an exact match.
1553          */
1554         tmpinp = NULL;
1555         INP_GROUP_LOCK(pcbgroup);
1556         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1557             pcbgroup->ipg_hashmask)];
1558         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
1559 #ifdef INET6
1560                 /* XXX inp locking */
1561                 if ((inp->inp_vflag & INP_IPV4) == 0)
1562                         continue;
1563 #endif
1564                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1565                     inp->inp_laddr.s_addr == laddr.s_addr &&
1566                     inp->inp_fport == fport &&
1567                     inp->inp_lport == lport) {
1568                         /*
1569                          * XXX We should be able to directly return
1570                          * the inp here, without any checks.
1571                          * Well unless both bound with SO_REUSEPORT?
1572                          */
1573                         if (prison_flag(inp->inp_cred, PR_IP4))
1574                                 goto found;
1575                         if (tmpinp == NULL)
1576                                 tmpinp = inp;
1577                 }
1578         }
1579         if (tmpinp != NULL) {
1580                 inp = tmpinp;
1581                 goto found;
1582         }
1583
1584         /*
1585          * Then look for a wildcard match, if requested.
1586          */
1587         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1588                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1589 #ifdef INET6
1590                 struct inpcb *local_wild_mapped = NULL;
1591 #endif
1592                 struct inpcb *jail_wild = NULL;
1593                 struct inpcbhead *head;
1594                 int injail;
1595
1596                 /*
1597                  * Order of socket selection - we always prefer jails.
1598                  *      1. jailed, non-wild.
1599                  *      2. jailed, wild.
1600                  *      3. non-jailed, non-wild.
1601                  *      4. non-jailed, wild.
1602                  */
1603                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
1604                     0, pcbinfo->ipi_wildmask)];
1605                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
1606 #ifdef INET6
1607                         /* XXX inp locking */
1608                         if ((inp->inp_vflag & INP_IPV4) == 0)
1609                                 continue;
1610 #endif
1611                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1612                             inp->inp_lport != lport)
1613                                 continue;
1614
1615                         /* XXX inp locking */
1616                         if (ifp && ifp->if_type == IFT_FAITH &&
1617                             (inp->inp_flags & INP_FAITH) == 0)
1618                                 continue;
1619
1620                         injail = prison_flag(inp->inp_cred, PR_IP4);
1621                         if (injail) {
1622                                 if (prison_check_ip4(inp->inp_cred,
1623                                     &laddr) != 0)
1624                                         continue;
1625                         } else {
1626                                 if (local_exact != NULL)
1627                                         continue;
1628                         }
1629
1630                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1631                                 if (injail)
1632                                         goto found;
1633                                 else
1634                                         local_exact = inp;
1635                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1636 #ifdef INET6
1637                                 /* XXX inp locking, NULL check */
1638                                 if (inp->inp_vflag & INP_IPV6PROTO)
1639                                         local_wild_mapped = inp;
1640                                 else
1641 #endif
1642                                         if (injail)
1643                                                 jail_wild = inp;
1644                                         else
1645                                                 local_wild = inp;
1646                         }
1647                 } /* LIST_FOREACH */
1648                 inp = jail_wild;
1649                 if (inp == NULL)
1650                         inp = local_exact;
1651                 if (inp == NULL)
1652                         inp = local_wild;
1653 #ifdef INET6
1654                 if (inp == NULL)
1655                         inp = local_wild_mapped;
1656 #endif
1657                 if (inp != NULL)
1658                         goto found;
1659         } /* if (lookupflags & INPLOOKUP_WILDCARD) */
1660         INP_GROUP_UNLOCK(pcbgroup);
1661         return (NULL);
1662
1663 found:
1664         in_pcbref(inp);
1665         INP_GROUP_UNLOCK(pcbgroup);
1666         if (lookupflags & INPLOOKUP_WLOCKPCB) {
1667                 INP_WLOCK(inp);
1668                 if (in_pcbrele_wlocked(inp))
1669                         return (NULL);
1670         } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1671                 INP_RLOCK(inp);
1672                 if (in_pcbrele_rlocked(inp))
1673                         return (NULL);
1674         } else
1675                 panic("%s: locking bug", __func__);
1676         return (inp);
1677 }
1678 #endif /* PCBGROUP */
1679
1680 /*
1681  * Lookup PCB in hash list, using pcbinfo tables.  This variation assumes
1682  * that the caller has locked the hash list, and will not perform any further
1683  * locking or reference operations on either the hash list or the connection.
1684  */
1685 static struct inpcb *
1686 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1687     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags,
1688     struct ifnet *ifp)
1689 {
1690         struct inpcbhead *head;
1691         struct inpcb *inp, *tmpinp;
1692         u_short fport = fport_arg, lport = lport_arg;
1693
1694         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1695             ("%s: invalid lookup flags %d", __func__, lookupflags));
1696
1697         INP_HASH_LOCK_ASSERT(pcbinfo);
1698
1699         /*
1700          * First look for an exact match.
1701          */
1702         tmpinp = NULL;
1703         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1704             pcbinfo->ipi_hashmask)];
1705         LIST_FOREACH(inp, head, inp_hash) {
1706 #ifdef INET6
1707                 /* XXX inp locking */
1708                 if ((inp->inp_vflag & INP_IPV4) == 0)
1709                         continue;
1710 #endif
1711                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1712                     inp->inp_laddr.s_addr == laddr.s_addr &&
1713                     inp->inp_fport == fport &&
1714                     inp->inp_lport == lport) {
1715                         /*
1716                          * XXX We should be able to directly return
1717                          * the inp here, without any checks.
1718                          * Well unless both bound with SO_REUSEPORT?
1719                          */
1720                         if (prison_flag(inp->inp_cred, PR_IP4))
1721                                 return (inp);
1722                         if (tmpinp == NULL)
1723                                 tmpinp = inp;
1724                 }
1725         }
1726         if (tmpinp != NULL)
1727                 return (tmpinp);
1728
1729         /*
1730          * Then look for a wildcard match, if requested.
1731          */
1732         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1733                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1734 #ifdef INET6
1735                 struct inpcb *local_wild_mapped = NULL;
1736 #endif
1737                 struct inpcb *jail_wild = NULL;
1738                 int injail;
1739
1740                 /*
1741                  * Order of socket selection - we always prefer jails.
1742                  *      1. jailed, non-wild.
1743                  *      2. jailed, wild.
1744                  *      3. non-jailed, non-wild.
1745                  *      4. non-jailed, wild.
1746                  */
1747
1748                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1749                     0, pcbinfo->ipi_hashmask)];
1750                 LIST_FOREACH(inp, head, inp_hash) {
1751 #ifdef INET6
1752                         /* XXX inp locking */
1753                         if ((inp->inp_vflag & INP_IPV4) == 0)
1754                                 continue;
1755 #endif
1756                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1757                             inp->inp_lport != lport)
1758                                 continue;
1759
1760                         /* XXX inp locking */
1761                         if (ifp && ifp->if_type == IFT_FAITH &&
1762                             (inp->inp_flags & INP_FAITH) == 0)
1763                                 continue;
1764
1765                         injail = prison_flag(inp->inp_cred, PR_IP4);
1766                         if (injail) {
1767                                 if (prison_check_ip4(inp->inp_cred,
1768                                     &laddr) != 0)
1769                                         continue;
1770                         } else {
1771                                 if (local_exact != NULL)
1772                                         continue;
1773                         }
1774
1775                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1776                                 if (injail)
1777                                         return (inp);
1778                                 else
1779                                         local_exact = inp;
1780                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1781 #ifdef INET6
1782                                 /* XXX inp locking, NULL check */
1783                                 if (inp->inp_vflag & INP_IPV6PROTO)
1784                                         local_wild_mapped = inp;
1785                                 else
1786 #endif
1787                                         if (injail)
1788                                                 jail_wild = inp;
1789                                         else
1790                                                 local_wild = inp;
1791                         }
1792                 } /* LIST_FOREACH */
1793                 if (jail_wild != NULL)
1794                         return (jail_wild);
1795                 if (local_exact != NULL)
1796                         return (local_exact);
1797                 if (local_wild != NULL)
1798                         return (local_wild);
1799 #ifdef INET6
1800                 if (local_wild_mapped != NULL)
1801                         return (local_wild_mapped);
1802 #endif
1803         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1804
1805         return (NULL);
1806 }
1807
1808 /*
1809  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1810  * hash list lock, and will return the inpcb locked (i.e., requires
1811  * INPLOOKUP_LOCKPCB).
1812  */
1813 static struct inpcb *
1814 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1815     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1816     struct ifnet *ifp)
1817 {
1818         struct inpcb *inp;
1819
1820         INP_HASH_RLOCK(pcbinfo);
1821         inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1822             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1823         if (inp != NULL) {
1824                 in_pcbref(inp);
1825                 INP_HASH_RUNLOCK(pcbinfo);
1826                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1827                         INP_WLOCK(inp);
1828                         if (in_pcbrele_wlocked(inp))
1829                                 return (NULL);
1830                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1831                         INP_RLOCK(inp);
1832                         if (in_pcbrele_rlocked(inp))
1833                                 return (NULL);
1834                 } else
1835                         panic("%s: locking bug", __func__);
1836         } else
1837                 INP_HASH_RUNLOCK(pcbinfo);
1838         return (inp);
1839 }
1840
1841 /*
1842  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1843  * from which a pre-calculated hash value may be extracted.
1844  *
1845  * Possibly more of this logic should be in in_pcbgroup.c.
1846  */
1847 struct inpcb *
1848 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport,
1849     struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1850 {
1851 #if defined(PCBGROUP)
1852         struct inpcbgroup *pcbgroup;
1853 #endif
1854
1855         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1856             ("%s: invalid lookup flags %d", __func__, lookupflags));
1857         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1858             ("%s: LOCKPCB not set", __func__));
1859
1860 #if defined(PCBGROUP)
1861         if (in_pcbgroup_enabled(pcbinfo)) {
1862                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1863                     fport);
1864                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1865                     laddr, lport, lookupflags, ifp));
1866         }
1867 #endif
1868         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1869             lookupflags, ifp));
1870 }
1871
1872 struct inpcb *
1873 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1874     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1875     struct ifnet *ifp, struct mbuf *m)
1876 {
1877 #ifdef PCBGROUP
1878         struct inpcbgroup *pcbgroup;
1879 #endif
1880
1881         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1882             ("%s: invalid lookup flags %d", __func__, lookupflags));
1883         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1884             ("%s: LOCKPCB not set", __func__));
1885
1886 #ifdef PCBGROUP
1887         if (in_pcbgroup_enabled(pcbinfo)) {
1888                 pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1889                     m->m_pkthdr.flowid);
1890                 if (pcbgroup != NULL)
1891                         return (in_pcblookup_group(pcbinfo, pcbgroup, faddr,
1892                             fport, laddr, lport, lookupflags, ifp));
1893                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1894                     fport);
1895                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1896                     laddr, lport, lookupflags, ifp));
1897         }
1898 #endif
1899         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1900             lookupflags, ifp));
1901 }
1902 #endif /* INET */
1903
1904 /*
1905  * Insert PCB onto various hash lists.
1906  */
1907 static int
1908 in_pcbinshash_internal(struct inpcb *inp, int do_pcbgroup_update)
1909 {
1910         struct inpcbhead *pcbhash;
1911         struct inpcbporthead *pcbporthash;
1912         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1913         struct inpcbport *phd;
1914         u_int32_t hashkey_faddr;
1915
1916         INP_WLOCK_ASSERT(inp);
1917         INP_HASH_WLOCK_ASSERT(pcbinfo);
1918
1919         KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
1920             ("in_pcbinshash: INP_INHASHLIST"));
1921
1922 #ifdef INET6
1923         if (inp->inp_vflag & INP_IPV6)
1924                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
1925         else
1926 #endif
1927         hashkey_faddr = inp->inp_faddr.s_addr;
1928
1929         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
1930                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
1931
1932         pcbporthash = &pcbinfo->ipi_porthashbase[
1933             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
1934
1935         /*
1936          * Go through port list and look for a head for this lport.
1937          */
1938         LIST_FOREACH(phd, pcbporthash, phd_hash) {
1939                 if (phd->phd_port == inp->inp_lport)
1940                         break;
1941         }
1942         /*
1943          * If none exists, malloc one and tack it on.
1944          */
1945         if (phd == NULL) {
1946                 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
1947                 if (phd == NULL) {
1948                         return (ENOBUFS); /* XXX */
1949                 }
1950                 phd->phd_port = inp->inp_lport;
1951                 LIST_INIT(&phd->phd_pcblist);
1952                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
1953         }
1954         inp->inp_phd = phd;
1955         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
1956         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
1957         inp->inp_flags |= INP_INHASHLIST;
1958 #ifdef PCBGROUP
1959         if (do_pcbgroup_update)
1960                 in_pcbgroup_update(inp);
1961 #endif
1962         return (0);
1963 }
1964
1965 /*
1966  * For now, there are two public interfaces to insert an inpcb into the hash
1967  * lists -- one that does update pcbgroups, and one that doesn't.  The latter
1968  * is used only in the TCP syncache, where in_pcbinshash is called before the
1969  * full 4-tuple is set for the inpcb, and we don't want to install in the
1970  * pcbgroup until later.
1971  *
1972  * XXXRW: This seems like a misfeature.  in_pcbinshash should always update
1973  * connection groups, and partially initialised inpcbs should not be exposed
1974  * to either reservation hash tables or pcbgroups.
1975  */
1976 int
1977 in_pcbinshash(struct inpcb *inp)
1978 {
1979
1980         return (in_pcbinshash_internal(inp, 1));
1981 }
1982
1983 int
1984 in_pcbinshash_nopcbgroup(struct inpcb *inp)
1985 {
1986
1987         return (in_pcbinshash_internal(inp, 0));
1988 }
1989
1990 /*
1991  * Move PCB to the proper hash bucket when { faddr, fport } have  been
1992  * changed. NOTE: This does not handle the case of the lport changing (the
1993  * hashed port list would have to be updated as well), so the lport must
1994  * not change after in_pcbinshash() has been called.
1995  */
1996 void
1997 in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m)
1998 {
1999         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
2000         struct inpcbhead *head;
2001         u_int32_t hashkey_faddr;
2002
2003         INP_WLOCK_ASSERT(inp);
2004         INP_HASH_WLOCK_ASSERT(pcbinfo);
2005
2006         KASSERT(inp->inp_flags & INP_INHASHLIST,
2007             ("in_pcbrehash: !INP_INHASHLIST"));
2008
2009 #ifdef INET6
2010         if (inp->inp_vflag & INP_IPV6)
2011                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
2012         else
2013 #endif
2014         hashkey_faddr = inp->inp_faddr.s_addr;
2015
2016         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
2017                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
2018
2019         LIST_REMOVE(inp, inp_hash);
2020         LIST_INSERT_HEAD(head, inp, inp_hash);
2021
2022 #ifdef PCBGROUP
2023         if (m != NULL)
2024                 in_pcbgroup_update_mbuf(inp, m);
2025         else
2026                 in_pcbgroup_update(inp);
2027 #endif
2028 }
2029
2030 void
2031 in_pcbrehash(struct inpcb *inp)
2032 {
2033
2034         in_pcbrehash_mbuf(inp, NULL);
2035 }
2036
2037 /*
2038  * Remove PCB from various lists.
2039  */
2040 static void
2041 in_pcbremlists(struct inpcb *inp)
2042 {
2043         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
2044
2045 #ifdef INVARIANTS
2046         if (pcbinfo == &V_tcbinfo) {
2047                 INP_INFO_RLOCK_ASSERT(pcbinfo);
2048         } else {
2049                 INP_INFO_WLOCK_ASSERT(pcbinfo);
2050         }
2051 #endif
2052
2053         INP_WLOCK_ASSERT(inp);
2054         INP_LIST_WLOCK_ASSERT(pcbinfo);
2055
2056         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
2057         if (inp->inp_flags & INP_INHASHLIST) {
2058                 struct inpcbport *phd = inp->inp_phd;
2059
2060                 INP_HASH_WLOCK(pcbinfo);
2061                 LIST_REMOVE(inp, inp_hash);
2062                 LIST_REMOVE(inp, inp_portlist);
2063                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
2064                         LIST_REMOVE(phd, phd_hash);
2065                         free(phd, M_PCB);
2066                 }
2067                 INP_HASH_WUNLOCK(pcbinfo);
2068                 inp->inp_flags &= ~INP_INHASHLIST;
2069         }
2070         LIST_REMOVE(inp, inp_list);
2071         pcbinfo->ipi_count--;
2072 #ifdef PCBGROUP
2073         in_pcbgroup_remove(inp);
2074 #endif
2075 }
2076
2077 /*
2078  * A set label operation has occurred at the socket layer, propagate the
2079  * label change into the in_pcb for the socket.
2080  */
2081 void
2082 in_pcbsosetlabel(struct socket *so)
2083 {
2084 #ifdef MAC
2085         struct inpcb *inp;
2086
2087         inp = sotoinpcb(so);
2088         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
2089
2090         INP_WLOCK(inp);
2091         SOCK_LOCK(so);
2092         mac_inpcb_sosetlabel(so, inp);
2093         SOCK_UNLOCK(so);
2094         INP_WUNLOCK(inp);
2095 #endif
2096 }
2097
2098 /*
2099  * ipport_tick runs once per second, determining if random port allocation
2100  * should be continued.  If more than ipport_randomcps ports have been
2101  * allocated in the last second, then we return to sequential port
2102  * allocation. We return to random allocation only once we drop below
2103  * ipport_randomcps for at least ipport_randomtime seconds.
2104  */
2105 static void
2106 ipport_tick(void *xtp)
2107 {
2108         VNET_ITERATOR_DECL(vnet_iter);
2109
2110         VNET_LIST_RLOCK_NOSLEEP();
2111         VNET_FOREACH(vnet_iter) {
2112                 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
2113                 if (V_ipport_tcpallocs <=
2114                     V_ipport_tcplastcount + V_ipport_randomcps) {
2115                         if (V_ipport_stoprandom > 0)
2116                                 V_ipport_stoprandom--;
2117                 } else
2118                         V_ipport_stoprandom = V_ipport_randomtime;
2119                 V_ipport_tcplastcount = V_ipport_tcpallocs;
2120                 CURVNET_RESTORE();
2121         }
2122         VNET_LIST_RUNLOCK_NOSLEEP();
2123         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
2124 }
2125
2126 static void
2127 ip_fini(void *xtp)
2128 {
2129
2130         callout_stop(&ipport_tick_callout);
2131 }
2132
2133 /*
2134  * The ipport_callout should start running at about the time we attach the
2135  * inet or inet6 domains.
2136  */
2137 static void
2138 ipport_tick_init(const void *unused __unused)
2139 {
2140
2141         /* Start ipport_tick. */
2142         callout_init(&ipport_tick_callout, 1);
2143         callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL);
2144         EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL,
2145                 SHUTDOWN_PRI_DEFAULT);
2146 }
2147 SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
2148     ipport_tick_init, NULL);
2149
2150 void
2151 inp_wlock(struct inpcb *inp)
2152 {
2153
2154         INP_WLOCK(inp);
2155 }
2156
2157 void
2158 inp_wunlock(struct inpcb *inp)
2159 {
2160
2161         INP_WUNLOCK(inp);
2162 }
2163
2164 void
2165 inp_rlock(struct inpcb *inp)
2166 {
2167
2168         INP_RLOCK(inp);
2169 }
2170
2171 void
2172 inp_runlock(struct inpcb *inp)
2173 {
2174
2175         INP_RUNLOCK(inp);
2176 }
2177
2178 #ifdef INVARIANTS
2179 void
2180 inp_lock_assert(struct inpcb *inp)
2181 {
2182
2183         INP_WLOCK_ASSERT(inp);
2184 }
2185
2186 void
2187 inp_unlock_assert(struct inpcb *inp)
2188 {
2189
2190         INP_UNLOCK_ASSERT(inp);
2191 }
2192 #endif
2193
2194 void
2195 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
2196 {
2197         struct inpcb *inp;
2198
2199         INP_INFO_WLOCK(&V_tcbinfo);
2200         LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
2201                 INP_WLOCK(inp);
2202                 func(inp, arg);
2203                 INP_WUNLOCK(inp);
2204         }
2205         INP_INFO_WUNLOCK(&V_tcbinfo);
2206 }
2207
2208 struct socket *
2209 inp_inpcbtosocket(struct inpcb *inp)
2210 {
2211
2212         INP_WLOCK_ASSERT(inp);
2213         return (inp->inp_socket);
2214 }
2215
2216 struct tcpcb *
2217 inp_inpcbtotcpcb(struct inpcb *inp)
2218 {
2219
2220         INP_WLOCK_ASSERT(inp);
2221         return ((struct tcpcb *)inp->inp_ppcb);
2222 }
2223
2224 int
2225 inp_ip_tos_get(const struct inpcb *inp)
2226 {
2227
2228         return (inp->inp_ip_tos);
2229 }
2230
2231 void
2232 inp_ip_tos_set(struct inpcb *inp, int val)
2233 {
2234
2235         inp->inp_ip_tos = val;
2236 }
2237
2238 void
2239 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
2240     uint32_t *faddr, uint16_t *fp)
2241 {
2242
2243         INP_LOCK_ASSERT(inp);
2244         *laddr = inp->inp_laddr.s_addr;
2245         *faddr = inp->inp_faddr.s_addr;
2246         *lp = inp->inp_lport;
2247         *fp = inp->inp_fport;
2248 }
2249
2250 struct inpcb *
2251 so_sotoinpcb(struct socket *so)
2252 {
2253
2254         return (sotoinpcb(so));
2255 }
2256
2257 struct tcpcb *
2258 so_sototcpcb(struct socket *so)
2259 {
2260
2261         return (sototcpcb(so));
2262 }
2263
2264 #ifdef DDB
2265 static void
2266 db_print_indent(int indent)
2267 {
2268         int i;
2269
2270         for (i = 0; i < indent; i++)
2271                 db_printf(" ");
2272 }
2273
2274 static void
2275 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
2276 {
2277         char faddr_str[48], laddr_str[48];
2278
2279         db_print_indent(indent);
2280         db_printf("%s at %p\n", name, inc);
2281
2282         indent += 2;
2283
2284 #ifdef INET6
2285         if (inc->inc_flags & INC_ISIPV6) {
2286                 /* IPv6. */
2287                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
2288                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
2289         } else
2290 #endif
2291         {
2292                 /* IPv4. */
2293                 inet_ntoa_r(inc->inc_laddr, laddr_str);
2294                 inet_ntoa_r(inc->inc_faddr, faddr_str);
2295         }
2296         db_print_indent(indent);
2297         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
2298             ntohs(inc->inc_lport));
2299         db_print_indent(indent);
2300         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
2301             ntohs(inc->inc_fport));
2302 }
2303
2304 static void
2305 db_print_inpflags(int inp_flags)
2306 {
2307         int comma;
2308
2309         comma = 0;
2310         if (inp_flags & INP_RECVOPTS) {
2311                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
2312                 comma = 1;
2313         }
2314         if (inp_flags & INP_RECVRETOPTS) {
2315                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
2316                 comma = 1;
2317         }
2318         if (inp_flags & INP_RECVDSTADDR) {
2319                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
2320                 comma = 1;
2321         }
2322         if (inp_flags & INP_HDRINCL) {
2323                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
2324                 comma = 1;
2325         }
2326         if (inp_flags & INP_HIGHPORT) {
2327                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
2328                 comma = 1;
2329         }
2330         if (inp_flags & INP_LOWPORT) {
2331                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
2332                 comma = 1;
2333         }
2334         if (inp_flags & INP_ANONPORT) {
2335                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
2336                 comma = 1;
2337         }
2338         if (inp_flags & INP_RECVIF) {
2339                 db_printf("%sINP_RECVIF", comma ? ", " : "");
2340                 comma = 1;
2341         }
2342         if (inp_flags & INP_MTUDISC) {
2343                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
2344                 comma = 1;
2345         }
2346         if (inp_flags & INP_FAITH) {
2347                 db_printf("%sINP_FAITH", comma ? ", " : "");
2348                 comma = 1;
2349         }
2350         if (inp_flags & INP_RECVTTL) {
2351                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
2352                 comma = 1;
2353         }
2354         if (inp_flags & INP_DONTFRAG) {
2355                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
2356                 comma = 1;
2357         }
2358         if (inp_flags & INP_RECVTOS) {
2359                 db_printf("%sINP_RECVTOS", comma ? ", " : "");
2360                 comma = 1;
2361         }
2362         if (inp_flags & IN6P_IPV6_V6ONLY) {
2363                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
2364                 comma = 1;
2365         }
2366         if (inp_flags & IN6P_PKTINFO) {
2367                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
2368                 comma = 1;
2369         }
2370         if (inp_flags & IN6P_HOPLIMIT) {
2371                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
2372                 comma = 1;
2373         }
2374         if (inp_flags & IN6P_HOPOPTS) {
2375                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
2376                 comma = 1;
2377         }
2378         if (inp_flags & IN6P_DSTOPTS) {
2379                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
2380                 comma = 1;
2381         }
2382         if (inp_flags & IN6P_RTHDR) {
2383                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
2384                 comma = 1;
2385         }
2386         if (inp_flags & IN6P_RTHDRDSTOPTS) {
2387                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
2388                 comma = 1;
2389         }
2390         if (inp_flags & IN6P_TCLASS) {
2391                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
2392                 comma = 1;
2393         }
2394         if (inp_flags & IN6P_AUTOFLOWLABEL) {
2395                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
2396                 comma = 1;
2397         }
2398         if (inp_flags & INP_TIMEWAIT) {
2399                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
2400                 comma  = 1;
2401         }
2402         if (inp_flags & INP_ONESBCAST) {
2403                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
2404                 comma  = 1;
2405         }
2406         if (inp_flags & INP_DROPPED) {
2407                 db_printf("%sINP_DROPPED", comma ? ", " : "");
2408                 comma  = 1;
2409         }
2410         if (inp_flags & INP_SOCKREF) {
2411                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
2412                 comma  = 1;
2413         }
2414         if (inp_flags & IN6P_RFC2292) {
2415                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
2416                 comma = 1;
2417         }
2418         if (inp_flags & IN6P_MTU) {
2419                 db_printf("IN6P_MTU%s", comma ? ", " : "");
2420                 comma = 1;
2421         }
2422 }
2423
2424 static void
2425 db_print_inpvflag(u_char inp_vflag)
2426 {
2427         int comma;
2428
2429         comma = 0;
2430         if (inp_vflag & INP_IPV4) {
2431                 db_printf("%sINP_IPV4", comma ? ", " : "");
2432                 comma  = 1;
2433         }
2434         if (inp_vflag & INP_IPV6) {
2435                 db_printf("%sINP_IPV6", comma ? ", " : "");
2436                 comma  = 1;
2437         }
2438         if (inp_vflag & INP_IPV6PROTO) {
2439                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
2440                 comma  = 1;
2441         }
2442 }
2443
2444 static void
2445 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
2446 {
2447
2448         db_print_indent(indent);
2449         db_printf("%s at %p\n", name, inp);
2450
2451         indent += 2;
2452
2453         db_print_indent(indent);
2454         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
2455
2456         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
2457
2458         db_print_indent(indent);
2459         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
2460             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
2461
2462         db_print_indent(indent);
2463         db_printf("inp_label: %p   inp_flags: 0x%x (",
2464            inp->inp_label, inp->inp_flags);
2465         db_print_inpflags(inp->inp_flags);
2466         db_printf(")\n");
2467
2468         db_print_indent(indent);
2469         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
2470             inp->inp_vflag);
2471         db_print_inpvflag(inp->inp_vflag);
2472         db_printf(")\n");
2473
2474         db_print_indent(indent);
2475         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
2476             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
2477
2478         db_print_indent(indent);
2479 #ifdef INET6
2480         if (inp->inp_vflag & INP_IPV6) {
2481                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
2482                     "in6p_moptions: %p\n", inp->in6p_options,
2483                     inp->in6p_outputopts, inp->in6p_moptions);
2484                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
2485                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
2486                     inp->in6p_hops);
2487         } else
2488 #endif
2489         {
2490                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
2491                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
2492                     inp->inp_options, inp->inp_moptions);
2493         }
2494
2495         db_print_indent(indent);
2496         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
2497             (uintmax_t)inp->inp_gencnt);
2498 }
2499
2500 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
2501 {
2502         struct inpcb *inp;
2503
2504         if (!have_addr) {
2505                 db_printf("usage: show inpcb <addr>\n");
2506                 return;
2507         }
2508         inp = (struct inpcb *)addr;
2509
2510         db_print_inpcb(inp, "inpcb", 0);
2511 }
2512 #endif /* DDB */