sys/netinet/in_pcb.c

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