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 #include "opt_rss.h"
  47
  48 #include <sys/param.h>
  49 #include <sys/systm.h>
  50 #include <sys/lock.h>
  51 #include <sys/malloc.h>
  52 #include <sys/mbuf.h>
  53 #include <sys/callout.h>
  54 #include <sys/domain.h>
  55 #include <sys/protosw.h>
  56 #include <sys/rmlock.h>
  57 #include <sys/socket.h>
  58 #include <sys/socketvar.h>
  59 #include <sys/priv.h>
  60 #include <sys/proc.h>
  61 #include <sys/refcount.h>
  62 #include <sys/jail.h>
  63 #include <sys/kernel.h>
  64 #include <sys/sysctl.h>
  65
  66 #ifdef DDB
  67 #include <ddb/ddb.h>
  68 #endif
  69
  70 #include <vm/uma.h>
  71
  72 #include <net/if.h>
  73 #include <net/if_var.h>
  74 #include <net/if_types.h>
  75 #include <net/route.h>
  76 #include <net/rss_config.h>
  77 #include <net/vnet.h>
  78
  79 #if defined(INET) || defined(INET6)
  80 #include <netinet/in.h>
  81 #include <netinet/in_pcb.h>
  82 #include <netinet/ip_var.h>
  83 #include <netinet/tcp_var.h>
  84 #include <netinet/udp.h>
  85 #include <netinet/udp_var.h>
  86 #endif
  87 #ifdef INET
  88 #include <netinet/in_var.h>
  89 #endif
  90 #ifdef INET6
  91 #include <netinet/ip6.h>
  92 #include <netinet6/in6_pcb.h>
  93 #include <netinet6/in6_var.h>
  94 #include <netinet6/ip6_var.h>
  95 #endif /* INET6 */
  96
  97
  98 #ifdef IPSEC
  99 #include <netipsec/ipsec.h>
 100 #include <netipsec/key.h>
 101 #endif /* IPSEC */
 102
 103 #include <security/mac/mac_framework.h>
 104
 105 static struct callout   ipport_tick_callout;
 106
 107 /*
 108  * These configure the range of local port addresses assigned to
 109  * "unspecified" outgoing connections/packets/whatever.
 110  */
 111 VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1;    /* 1023 */
 112 VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART;    /* 600 */
 113 VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST;     /* 10000 */
 114 VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST;       /* 65535 */
 115 VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO;      /* 49152 */
 116 VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO;        /* 65535 */
 117
 118 /*
 119  * Reserved ports accessible only to root. There are significant
 120  * security considerations that must be accounted for when changing these,
 121  * but the security benefits can be great. Please be careful.
 122  */
 123 VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1;    /* 1023 */
 124 VNET_DEFINE(int, ipport_reservedlow);
 125
 126 /* Variables dealing with random ephemeral port allocation. */
 127 VNET_DEFINE(int, ipport_randomized) = 1;        /* user controlled via sysctl */
 128 VNET_DEFINE(int, ipport_randomcps) = 10;        /* user controlled via sysctl */
 129 VNET_DEFINE(int, ipport_randomtime) = 45;       /* user controlled via sysctl */
 130 VNET_DEFINE(int, ipport_stoprandom);            /* toggled by ipport_tick */
 131 VNET_DEFINE(int, ipport_tcpallocs);
 132 static VNET_DEFINE(int, ipport_tcplastcount);
 133
 134 #define V_ipport_tcplastcount           VNET(ipport_tcplastcount)
 135
 136 static void     in_pcbremlists(struct inpcb *inp);
 137 #ifdef INET
 138 static struct inpcb     *in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo,
 139                             struct in_addr faddr, u_int fport_arg,
 140                             struct in_addr laddr, u_int lport_arg,
 141                             int lookupflags, struct ifnet *ifp);
 142
 143 #define RANGECHK(var, min, max) \
 144         if ((var) < (min)) { (var) = (min); } \
 145         else if ((var) > (max)) { (var) = (max); }
 146
 147 static int
 148 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
 149 {
 150         int error;
 151
 152         error = sysctl_handle_int(oidp, arg1, arg2, req);
 153         if (error == 0) {
 154                 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
 155                 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
 156                 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
 157                 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
 158                 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
 159                 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
 160         }
 161         return (error);
 162 }
 163
 164 #undef RANGECHK
 165
 166 static SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0,
 167     "IP Ports");
 168
 169 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst,
 170         CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
 171         &VNET_NAME(ipport_lowfirstauto), 0, &sysctl_net_ipport_check, "I", "");
 172 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast,
 173         CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
 174         &VNET_NAME(ipport_lowlastauto), 0, &sysctl_net_ipport_check, "I", "");
 175 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first,
 176         CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
 177         &VNET_NAME(ipport_firstauto), 0, &sysctl_net_ipport_check, "I", "");
 178 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last,
 179         CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
 180         &VNET_NAME(ipport_lastauto), 0, &sysctl_net_ipport_check, "I", "");
 181 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst,
 182         CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
 183         &VNET_NAME(ipport_hifirstauto), 0, &sysctl_net_ipport_check, "I", "");
 184 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast,
 185         CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
 186         &VNET_NAME(ipport_hilastauto), 0, &sysctl_net_ipport_check, "I", "");
 187 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
 188         CTLFLAG_VNET | CTLFLAG_RW | CTLFLAG_SECURE,
 189         &VNET_NAME(ipport_reservedhigh), 0, "");
 190 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
 191         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, "");
 192 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomized,
 193         CTLFLAG_VNET | CTLFLAG_RW,
 194         &VNET_NAME(ipport_randomized), 0, "Enable random port allocation");
 195 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomcps,
 196         CTLFLAG_VNET | CTLFLAG_RW,
 197         &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port "
 198         "allocations before switching to a sequental one");
 199 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomtime,
 200         CTLFLAG_VNET | CTLFLAG_RW,
 201         &VNET_NAME(ipport_randomtime), 0,
 202         "Minimum time to keep sequental port "
 203         "allocation before switching to a random one");
 204 #endif /* INET */
 205
 206 /*
 207  * in_pcb.c: manage the Protocol Control Blocks.
 208  *
 209  * NOTE: It is assumed that most of these functions will be called with
 210  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
 211  * functions often modify hash chains or addresses in pcbs.
 212  */
 213
 214 /*
 215  * Initialize an inpcbinfo -- we should be able to reduce the number of
 216  * arguments in time.
 217  */
 218 void
 219 in_pcbinfo_init(struct inpcbinfo *pcbinfo, const char *name,
 220     struct inpcbhead *listhead, int hash_nelements, int porthash_nelements,
 221     char *inpcbzone_name, uma_init inpcbzone_init, uma_fini inpcbzone_fini,
 222     uint32_t inpcbzone_flags, u_int hashfields)
 223 {
 224
 225         INP_INFO_LOCK_INIT(pcbinfo, name);
 226         INP_HASH_LOCK_INIT(pcbinfo, "pcbinfohash");     /* XXXRW: argument? */
 227         INP_LIST_LOCK_INIT(pcbinfo, "pcbinfolist");
 228 #ifdef VIMAGE
 229         pcbinfo->ipi_vnet = curvnet;
 230 #endif
 231         pcbinfo->ipi_listhead = listhead;
 232         LIST_INIT(pcbinfo->ipi_listhead);
 233         pcbinfo->ipi_count = 0;
 234         pcbinfo->ipi_hashbase = hashinit(hash_nelements, M_PCB,
 235             &pcbinfo->ipi_hashmask);
 236         pcbinfo->ipi_porthashbase = hashinit(porthash_nelements, M_PCB,
 237             &pcbinfo->ipi_porthashmask);
 238 #ifdef PCBGROUP
 239         in_pcbgroup_init(pcbinfo, hashfields, hash_nelements);
 240 #endif
 241         pcbinfo->ipi_zone = uma_zcreate(inpcbzone_name, sizeof(struct inpcb),
 242             NULL, NULL, inpcbzone_init, inpcbzone_fini, UMA_ALIGN_PTR,
 243             inpcbzone_flags);
 244         uma_zone_set_max(pcbinfo->ipi_zone, maxsockets);
 245         uma_zone_set_warning(pcbinfo->ipi_zone,
 246             "kern.ipc.maxsockets limit reached");
 247 }
 248
 249 /*
 250  * Destroy an inpcbinfo.
 251  */
 252 void
 253 in_pcbinfo_destroy(struct inpcbinfo *pcbinfo)
 254 {
 255
 256         KASSERT(pcbinfo->ipi_count == 0,
 257             ("%s: ipi_count = %u", __func__, pcbinfo->ipi_count));
 258
 259         hashdestroy(pcbinfo->ipi_hashbase, M_PCB, pcbinfo->ipi_hashmask);
 260         hashdestroy(pcbinfo->ipi_porthashbase, M_PCB,
 261             pcbinfo->ipi_porthashmask);
 262 #ifdef PCBGROUP
 263         in_pcbgroup_destroy(pcbinfo);
 264 #endif
 265         uma_zdestroy(pcbinfo->ipi_zone);
 266         INP_LIST_LOCK_DESTROY(pcbinfo);
 267         INP_HASH_LOCK_DESTROY(pcbinfo);
 268         INP_INFO_LOCK_DESTROY(pcbinfo);
 269 }
 270
 271 /*
 272  * Allocate a PCB and associate it with the socket.
 273  * On success return with the PCB locked.
 274  */
 275 int
 276 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
 277 {
 278         struct inpcb *inp;
 279         int error;
 280
 281 #ifdef INVARIANTS
 282         if (pcbinfo == &V_tcbinfo) {
 283                 INP_INFO_RLOCK_ASSERT(pcbinfo);
 284         } else {
 285                 INP_INFO_WLOCK_ASSERT(pcbinfo);
 286         }
 287 #endif
 288
 289         error = 0;
 290         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
 291         if (inp == NULL)
 292                 return (ENOBUFS);
 293         bzero(inp, inp_zero_size);
 294         inp->inp_pcbinfo = pcbinfo;
 295         inp->inp_socket = so;
 296         inp->inp_cred = crhold(so->so_cred);
 297         inp->inp_inc.inc_fibnum = so->so_fibnum;
 298 #ifdef MAC
 299         error = mac_inpcb_init(inp, M_NOWAIT);
 300         if (error != 0)
 301                 goto out;
 302         mac_inpcb_create(so, inp);
 303 #endif
 304 #ifdef IPSEC
 305         error = ipsec_init_policy(so, &inp->inp_sp);
 306         if (error != 0) {
 307 #ifdef MAC
 308                 mac_inpcb_destroy(inp);
 309 #endif
 310                 goto out;
 311         }
 312 #endif /*IPSEC*/
 313 #ifdef INET6
 314         if (INP_SOCKAF(so) == AF_INET6) {
 315                 inp->inp_vflag |= INP_IPV6PROTO;
 316                 if (V_ip6_v6only)
 317                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
 318         }
 319 #endif
 320         INP_WLOCK(inp);
 321         INP_LIST_WLOCK(pcbinfo);
 322         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
 323         pcbinfo->ipi_count++;
 324         so->so_pcb = (caddr_t)inp;
 325 #ifdef INET6
 326         if (V_ip6_auto_flowlabel)
 327                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
 328 #endif
 329         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 330         refcount_init(&inp->inp_refcount, 1);   /* Reference from inpcbinfo */
 331         INP_LIST_WUNLOCK(pcbinfo);
 332 #if defined(IPSEC) || defined(MAC)
 333 out:
 334         if (error != 0) {
 335                 crfree(inp->inp_cred);
 336                 uma_zfree(pcbinfo->ipi_zone, inp);
 337         }
 338 #endif
 339         return (error);
 340 }
 341
 342 #ifdef INET
 343 int
 344 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 345 {
 346         int anonport, error;
 347
 348         INP_WLOCK_ASSERT(inp);
 349         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 350
 351         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
 352                 return (EINVAL);
 353         anonport = nam == NULL || ((struct sockaddr_in *)nam)->sin_port == 0;
 354         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
 355             &inp->inp_lport, cred);
 356         if (error)
 357                 return (error);
 358         if (in_pcbinshash(inp) != 0) {
 359                 inp->inp_laddr.s_addr = INADDR_ANY;
 360                 inp->inp_lport = 0;
 361                 return (EAGAIN);
 362         }
 363         if (anonport)
 364                 inp->inp_flags |= INP_ANONPORT;
 365         return (0);
 366 }
 367 #endif
 368
 369 /*
 370  * Select a local port (number) to use.
 371  */
 372 #if defined(INET) || defined(INET6)
 373 int
 374 in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp,
 375     struct ucred *cred, int lookupflags)
 376 {
 377         struct inpcbinfo *pcbinfo;
 378         struct inpcb *tmpinp;
 379         unsigned short *lastport;
 380         int count, dorandom, error;
 381         u_short aux, first, last, lport;
 382 #ifdef INET
 383         struct in_addr laddr;
 384 #endif
 385
 386         pcbinfo = inp->inp_pcbinfo;
 387
 388         /*
 389          * Because no actual state changes occur here, a global write lock on
 390          * the pcbinfo isn't required.
 391          */
 392         INP_LOCK_ASSERT(inp);
 393         INP_HASH_LOCK_ASSERT(pcbinfo);
 394
 395         if (inp->inp_flags & INP_HIGHPORT) {
 396                 first = V_ipport_hifirstauto;   /* sysctl */
 397                 last  = V_ipport_hilastauto;
 398                 lastport = &pcbinfo->ipi_lasthi;
 399         } else if (inp->inp_flags & INP_LOWPORT) {
 400                 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
 401                 if (error)
 402                         return (error);
 403                 first = V_ipport_lowfirstauto;  /* 1023 */
 404                 last  = V_ipport_lowlastauto;   /* 600 */
 405                 lastport = &pcbinfo->ipi_lastlow;
 406         } else {
 407                 first = V_ipport_firstauto;     /* sysctl */
 408                 last  = V_ipport_lastauto;
 409                 lastport = &pcbinfo->ipi_lastport;
 410         }
 411         /*
 412          * For UDP(-Lite), use random port allocation as long as the user
 413          * allows it.  For TCP (and as of yet unknown) connections,
 414          * use random port allocation only if the user allows it AND
 415          * ipport_tick() allows it.
 416          */
 417         if (V_ipport_randomized &&
 418                 (!V_ipport_stoprandom || pcbinfo == &V_udbinfo ||
 419                 pcbinfo == &V_ulitecbinfo))
 420                 dorandom = 1;
 421         else
 422                 dorandom = 0;
 423         /*
 424          * It makes no sense to do random port allocation if
 425          * we have the only port available.
 426          */
 427         if (first == last)
 428                 dorandom = 0;
 429         /* Make sure to not include UDP(-Lite) packets in the count. */
 430         if (pcbinfo != &V_udbinfo || pcbinfo != &V_ulitecbinfo)
 431                 V_ipport_tcpallocs++;
 432         /*
 433          * Instead of having two loops further down counting up or down
 434          * make sure that first is always <= last and go with only one
 435          * code path implementing all logic.
 436          */
 437         if (first > last) {
 438                 aux = first;
 439                 first = last;
 440                 last = aux;
 441         }
 442
 443 #ifdef INET
 444         /* Make the compiler happy. */
 445         laddr.s_addr = 0;
 446         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) {
 447                 KASSERT(laddrp != NULL, ("%s: laddrp NULL for v4 inp %p",
 448                     __func__, inp));
 449                 laddr = *laddrp;
 450         }
 451 #endif
 452         tmpinp = NULL;  /* Make compiler happy. */
 453         lport = *lportp;
 454
 455         if (dorandom)
 456                 *lastport = first + (arc4random() % (last - first));
 457
 458         count = last - first;
 459
 460         do {
 461                 if (count-- < 0)        /* completely used? */
 462                         return (EADDRNOTAVAIL);
 463                 ++*lastport;
 464                 if (*lastport < first || *lastport > last)
 465                         *lastport = first;
 466                 lport = htons(*lastport);
 467
 468 #ifdef INET6
 469                 if ((inp->inp_vflag & INP_IPV6) != 0)
 470                         tmpinp = in6_pcblookup_local(pcbinfo,
 471                             &inp->in6p_laddr, lport, lookupflags, cred);
 472 #endif
 473 #if defined(INET) && defined(INET6)
 474                 else
 475 #endif
 476 #ifdef INET
 477                         tmpinp = in_pcblookup_local(pcbinfo, laddr,
 478                             lport, lookupflags, cred);
 479 #endif
 480         } while (tmpinp != NULL);
 481
 482 #ifdef INET
 483         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4)
 484                 laddrp->s_addr = laddr.s_addr;
 485 #endif
 486         *lportp = lport;
 487
 488         return (0);
 489 }
 490
 491 /*
 492  * Return cached socket options.
 493  */
 494 short
 495 inp_so_options(const struct inpcb *inp)
 496 {
 497    short so_options;
 498
 499    so_options = 0;
 500
 501    if ((inp->inp_flags2 & INP_REUSEPORT) != 0)
 502            so_options |= SO_REUSEPORT;
 503    if ((inp->inp_flags2 & INP_REUSEADDR) != 0)
 504            so_options |= SO_REUSEADDR;
 505    return (so_options);
 506 }
 507 #endif /* INET || INET6 */
 508
 509 /*
 510  * Check if a new BINDMULTI socket is allowed to be created.
 511  *
 512  * ni points to the new inp.
 513  * oi points to the exisitng inp.
 514  *
 515  * This checks whether the existing inp also has BINDMULTI and
 516  * whether the credentials match.
 517  */
 518 int
 519 in_pcbbind_check_bindmulti(const struct inpcb *ni, const struct inpcb *oi)
 520 {
 521         /* Check permissions match */
 522         if ((ni->inp_flags2 & INP_BINDMULTI) &&
 523             (ni->inp_cred->cr_uid !=
 524             oi->inp_cred->cr_uid))
 525                 return (0);
 526
 527         /* Check the existing inp has BINDMULTI set */
 528         if ((ni->inp_flags2 & INP_BINDMULTI) &&
 529             ((oi->inp_flags2 & INP_BINDMULTI) == 0))
 530                 return (0);
 531
 532         /*
 533          * We're okay - either INP_BINDMULTI isn't set on ni, or
 534          * it is and it matches the checks.
 535          */
 536         return (1);
 537 }
 538
 539 #ifdef INET
 540 /*
 541  * Set up a bind operation on a PCB, performing port allocation
 542  * as required, but do not actually modify the PCB. Callers can
 543  * either complete the bind by setting inp_laddr/inp_lport and
 544  * calling in_pcbinshash(), or they can just use the resulting
 545  * port and address to authorise the sending of a once-off packet.
 546  *
 547  * On error, the values of *laddrp and *lportp are not changed.
 548  */
 549 int
 550 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
 551     u_short *lportp, struct ucred *cred)
 552 {
 553         struct socket *so = inp->inp_socket;
 554         struct sockaddr_in *sin;
 555         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 556         struct in_addr laddr;
 557         u_short lport = 0;
 558         int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT);
 559         int error;
 560
 561         /*
 562          * No state changes, so read locks are sufficient here.
 563          */
 564         INP_LOCK_ASSERT(inp);
 565         INP_HASH_LOCK_ASSERT(pcbinfo);
 566
 567         if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
 568                 return (EADDRNOTAVAIL);
 569         laddr.s_addr = *laddrp;
 570         if (nam != NULL && laddr.s_addr != INADDR_ANY)
 571                 return (EINVAL);
 572         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 573                 lookupflags = INPLOOKUP_WILDCARD;
 574         if (nam == NULL) {
 575                 if ((error = prison_local_ip4(cred, &laddr)) != 0)
 576                         return (error);
 577         } else {
 578                 sin = (struct sockaddr_in *)nam;
 579                 if (nam->sa_len != sizeof (*sin))
 580                         return (EINVAL);
 581 #ifdef notdef
 582                 /*
 583                  * We should check the family, but old programs
 584                  * incorrectly fail to initialize it.
 585                  */
 586                 if (sin->sin_family != AF_INET)
 587                         return (EAFNOSUPPORT);
 588 #endif
 589                 error = prison_local_ip4(cred, &sin->sin_addr);
 590                 if (error)
 591                         return (error);
 592                 if (sin->sin_port != *lportp) {
 593                         /* Don't allow the port to change. */
 594                         if (*lportp != 0)
 595                                 return (EINVAL);
 596                         lport = sin->sin_port;
 597                 }
 598                 /* NB: lport is left as 0 if the port isn't being changed. */
 599                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
 600                         /*
 601                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 602                          * allow complete duplication of binding if
 603                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 604                          * and a multicast address is bound on both
 605                          * new and duplicated sockets.
 606                          */
 607                         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
 608                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 609                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
 610                         sin->sin_port = 0;              /* yech... */
 611                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 612                         /*
 613                          * Is the address a local IP address?
 614                          * If INP_BINDANY is set, then the socket may be bound
 615                          * to any endpoint address, local or not.
 616                          */
 617                         if ((inp->inp_flags & INP_BINDANY) == 0 &&
 618                             ifa_ifwithaddr_check((struct sockaddr *)sin) == 0)
 619                                 return (EADDRNOTAVAIL);
 620                 }
 621                 laddr = sin->sin_addr;
 622                 if (lport) {
 623                         struct inpcb *t;
 624                         struct tcptw *tw;
 625
 626                         /* GROSS */
 627                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 628                             ntohs(lport) >= V_ipport_reservedlow &&
 629                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 630                             0))
 631                                 return (EACCES);
 632                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
 633                             priv_check_cred(inp->inp_cred,
 634                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 635                                 t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 636                                     lport, INPLOOKUP_WILDCARD, cred);
 637         /*
 638          * XXX
 639          * This entire block sorely needs a rewrite.
 640          */
 641                                 if (t &&
 642                                     ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
 643                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 644                                     (so->so_type != SOCK_STREAM ||
 645                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
 646                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
 647                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 648                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
 649                                     (inp->inp_cred->cr_uid !=
 650                                      t->inp_cred->cr_uid))
 651                                         return (EADDRINUSE);
 652
 653                                 /*
 654                                  * If the socket is a BINDMULTI socket, then
 655                                  * the credentials need to match and the
 656                                  * original socket also has to have been bound
 657                                  * with BINDMULTI.
 658                                  */
 659                                 if (t && (! in_pcbbind_check_bindmulti(inp, t)))
 660                                         return (EADDRINUSE);
 661                         }
 662                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
 663                             lport, lookupflags, cred);
 664                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 665                                 /*
 666                                  * XXXRW: If an incpb has had its timewait
 667                                  * state recycled, we treat the address as
 668                                  * being in use (for now).  This is better
 669                                  * than a panic, but not desirable.
 670                                  */
 671                                 tw = intotw(t);
 672                                 if (tw == NULL ||
 673                                     (reuseport & tw->tw_so_options) == 0)
 674                                         return (EADDRINUSE);
 675                         } else if (t &&
 676                             ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
 677                             (reuseport & inp_so_options(t)) == 0) {
 678 #ifdef INET6
 679                                 if (ntohl(sin->sin_addr.s_addr) !=
 680                                     INADDR_ANY ||
 681                                     ntohl(t->inp_laddr.s_addr) !=
 682                                     INADDR_ANY ||
 683                                     (inp->inp_vflag & INP_IPV6PROTO) == 0 ||
 684                                     (t->inp_vflag & INP_IPV6PROTO) == 0)
 685 #endif
 686                                 return (EADDRINUSE);
 687                                 if (t && (! in_pcbbind_check_bindmulti(inp, t)))
 688                                         return (EADDRINUSE);
 689                         }
 690                 }
 691         }
 692         if (*lportp != 0)
 693                 lport = *lportp;
 694         if (lport == 0) {
 695                 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags);
 696                 if (error != 0)
 697                         return (error);
 698
 699         }
 700         *laddrp = laddr.s_addr;
 701         *lportp = lport;
 702         return (0);
 703 }
 704
 705 /*
 706  * Connect from a socket to a specified address.
 707  * Both address and port must be specified in argument sin.
 708  * If don't have a local address for this socket yet,
 709  * then pick one.
 710  */
 711 int
 712 in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
 713     struct ucred *cred, struct mbuf *m)
 714 {
 715         u_short lport, fport;
 716         in_addr_t laddr, faddr;
 717         int anonport, error;
 718
 719         INP_WLOCK_ASSERT(inp);
 720         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 721
 722         lport = inp->inp_lport;
 723         laddr = inp->inp_laddr.s_addr;
 724         anonport = (lport == 0);
 725         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
 726             NULL, cred);
 727         if (error)
 728                 return (error);
 729
 730         /* Do the initial binding of the local address if required. */
 731         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
 732                 inp->inp_lport = lport;
 733                 inp->inp_laddr.s_addr = laddr;
 734                 if (in_pcbinshash(inp) != 0) {
 735                         inp->inp_laddr.s_addr = INADDR_ANY;
 736                         inp->inp_lport = 0;
 737                         return (EAGAIN);
 738                 }
 739         }
 740
 741         /* Commit the remaining changes. */
 742         inp->inp_lport = lport;
 743         inp->inp_laddr.s_addr = laddr;
 744         inp->inp_faddr.s_addr = faddr;
 745         inp->inp_fport = fport;
 746         in_pcbrehash_mbuf(inp, m);
 747
 748         if (anonport)
 749                 inp->inp_flags |= INP_ANONPORT;
 750         return (0);
 751 }
 752
 753 int
 754 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 755 {
 756
 757         return (in_pcbconnect_mbuf(inp, nam, cred, NULL));
 758 }
 759
 760 /*
 761  * Do proper source address selection on an unbound socket in case
 762  * of connect. Take jails into account as well.
 763  */
 764 int
 765 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
 766     struct ucred *cred)
 767 {
 768         struct ifaddr *ifa;
 769         struct sockaddr *sa;
 770         struct sockaddr_in *sin;
 771         struct route sro;
 772         int error;
 773
 774         KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
 775
 776         /*
 777          * Bypass source address selection and use the primary jail IP
 778          * if requested.
 779          */
 780         if (cred != NULL && !prison_saddrsel_ip4(cred, laddr))
 781                 return (0);
 782
 783         error = 0;
 784         bzero(&sro, sizeof(sro));
 785
 786         sin = (struct sockaddr_in *)&sro.ro_dst;
 787         sin->sin_family = AF_INET;
 788         sin->sin_len = sizeof(struct sockaddr_in);
 789         sin->sin_addr.s_addr = faddr->s_addr;
 790
 791         /*
 792          * If route is known our src addr is taken from the i/f,
 793          * else punt.
 794          *
 795          * Find out route to destination.
 796          */
 797         if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
 798                 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
 799
 800         /*
 801          * If we found a route, use the address corresponding to
 802          * the outgoing interface.
 803          *
 804          * Otherwise assume faddr is reachable on a directly connected
 805          * network and try to find a corresponding interface to take
 806          * the source address from.
 807          */
 808         if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
 809                 struct in_ifaddr *ia;
 810                 struct ifnet *ifp;
 811
 812                 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin,
 813                                         inp->inp_socket->so_fibnum));
 814                 if (ia == NULL)
 815                         ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0,
 816                                                 inp->inp_socket->so_fibnum));
 817                 if (ia == NULL) {
 818                         error = ENETUNREACH;
 819                         goto done;
 820                 }
 821
 822                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 823                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 824                         ifa_free(&ia->ia_ifa);
 825                         goto done;
 826                 }
 827
 828                 ifp = ia->ia_ifp;
 829                 ifa_free(&ia->ia_ifa);
 830                 ia = NULL;
 831                 IF_ADDR_RLOCK(ifp);
 832                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 833
 834                         sa = ifa->ifa_addr;
 835                         if (sa->sa_family != AF_INET)
 836                                 continue;
 837                         sin = (struct sockaddr_in *)sa;
 838                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 839                                 ia = (struct in_ifaddr *)ifa;
 840                                 break;
 841                         }
 842                 }
 843                 if (ia != NULL) {
 844                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 845                         IF_ADDR_RUNLOCK(ifp);
 846                         goto done;
 847                 }
 848                 IF_ADDR_RUNLOCK(ifp);
 849
 850                 /* 3. As a last resort return the 'default' jail address. */
 851                 error = prison_get_ip4(cred, laddr);
 852                 goto done;
 853         }
 854
 855         /*
 856          * If the outgoing interface on the route found is not
 857          * a loopback interface, use the address from that interface.
 858          * In case of jails do those three steps:
 859          * 1. check if the interface address belongs to the jail. If so use it.
 860          * 2. check if we have any address on the outgoing interface
 861          *    belonging to this jail. If so use it.
 862          * 3. as a last resort return the 'default' jail address.
 863          */
 864         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
 865                 struct in_ifaddr *ia;
 866                 struct ifnet *ifp;
 867
 868                 /* If not jailed, use the default returned. */
 869                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 870                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 871                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 872                         goto done;
 873                 }
 874
 875                 /* Jailed. */
 876                 /* 1. Check if the iface address belongs to the jail. */
 877                 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
 878                 if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 879                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
 880                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 881                         goto done;
 882                 }
 883
 884                 /*
 885                  * 2. Check if we have any address on the outgoing interface
 886                  *    belonging to this jail.
 887                  */
 888                 ia = NULL;
 889                 ifp = sro.ro_rt->rt_ifp;
 890                 IF_ADDR_RLOCK(ifp);
 891                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 892                         sa = ifa->ifa_addr;
 893                         if (sa->sa_family != AF_INET)
 894                                 continue;
 895                         sin = (struct sockaddr_in *)sa;
 896                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
 897                                 ia = (struct in_ifaddr *)ifa;
 898                                 break;
 899                         }
 900                 }
 901                 if (ia != NULL) {
 902                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 903                         IF_ADDR_RUNLOCK(ifp);
 904                         goto done;
 905                 }
 906                 IF_ADDR_RUNLOCK(ifp);
 907
 908                 /* 3. As a last resort return the 'default' jail address. */
 909                 error = prison_get_ip4(cred, laddr);
 910                 goto done;
 911         }
 912
 913         /*
 914          * The outgoing interface is marked with 'loopback net', so a route
 915          * to ourselves is here.
 916          * Try to find the interface of the destination address and then
 917          * take the address from there. That interface is not necessarily
 918          * a loopback interface.
 919          * In case of jails, check that it is an address of the jail
 920          * and if we cannot find, fall back to the 'default' jail address.
 921          */
 922         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
 923                 struct sockaddr_in sain;
 924                 struct in_ifaddr *ia;
 925
 926                 bzero(&sain, sizeof(struct sockaddr_in));
 927                 sain.sin_family = AF_INET;
 928                 sain.sin_len = sizeof(struct sockaddr_in);
 929                 sain.sin_addr.s_addr = faddr->s_addr;
 930
 931                 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain),
 932                                         inp->inp_socket->so_fibnum));
 933                 if (ia == NULL)
 934                         ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0,
 935                                                 inp->inp_socket->so_fibnum));
 936                 if (ia == NULL)
 937                         ia = ifatoia(ifa_ifwithaddr(sintosa(&sain)));
 938
 939                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
 940                         if (ia == NULL) {
 941                                 error = ENETUNREACH;
 942                                 goto done;
 943                         }
 944                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 945                         ifa_free(&ia->ia_ifa);
 946                         goto done;
 947                 }
 948
 949                 /* Jailed. */
 950                 if (ia != NULL) {
 951                         struct ifnet *ifp;
 952
 953                         ifp = ia->ia_ifp;
 954                         ifa_free(&ia->ia_ifa);
 955                         ia = NULL;
 956                         IF_ADDR_RLOCK(ifp);
 957                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 958
 959                                 sa = ifa->ifa_addr;
 960                                 if (sa->sa_family != AF_INET)
 961                                         continue;
 962                                 sin = (struct sockaddr_in *)sa;
 963                                 if (prison_check_ip4(cred,
 964                                     &sin->sin_addr) == 0) {
 965                                         ia = (struct in_ifaddr *)ifa;
 966                                         break;
 967                                 }
 968                         }
 969                         if (ia != NULL) {
 970                                 laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
 971                                 IF_ADDR_RUNLOCK(ifp);
 972                                 goto done;
 973                         }
 974                         IF_ADDR_RUNLOCK(ifp);
 975                 }
 976
 977                 /* 3. As a last resort return the 'default' jail address. */
 978                 error = prison_get_ip4(cred, laddr);
 979                 goto done;
 980         }
 981
 982 done:
 983         if (sro.ro_rt != NULL)
 984                 RTFREE(sro.ro_rt);
 985         return (error);
 986 }
 987
 988 /*
 989  * Set up for a connect from a socket to the specified address.
 990  * On entry, *laddrp and *lportp should contain the current local
 991  * address and port for the PCB; these are updated to the values
 992  * that should be placed in inp_laddr and inp_lport to complete
 993  * the connect.
 994  *
 995  * On success, *faddrp and *fportp will be set to the remote address
 996  * and port. These are not updated in the error case.
 997  *
 998  * If the operation fails because the connection already exists,
 999  * *oinpp will be set to the PCB of that connection so that the
1000  * caller can decide to override it. In all other cases, *oinpp
1001  * is set to NULL.
1002  */
1003 int
1004 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
1005     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
1006     struct inpcb **oinpp, struct ucred *cred)
1007 {
1008         struct rm_priotracker in_ifa_tracker;
1009         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1010         struct in_ifaddr *ia;
1011         struct inpcb *oinp;
1012         struct in_addr laddr, faddr;
1013         u_short lport, fport;
1014         int error;
1015
1016         /*
1017          * Because a global state change doesn't actually occur here, a read
1018          * lock is sufficient.
1019          */
1020         INP_LOCK_ASSERT(inp);
1021         INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo);
1022
1023         if (oinpp != NULL)
1024                 *oinpp = NULL;
1025         if (nam->sa_len != sizeof (*sin))
1026                 return (EINVAL);
1027         if (sin->sin_family != AF_INET)
1028                 return (EAFNOSUPPORT);
1029         if (sin->sin_port == 0)
1030                 return (EADDRNOTAVAIL);
1031         laddr.s_addr = *laddrp;
1032         lport = *lportp;
1033         faddr = sin->sin_addr;
1034         fport = sin->sin_port;
1035
1036         if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
1037                 /*
1038                  * If the destination address is INADDR_ANY,
1039                  * use the primary local address.
1040                  * If the supplied address is INADDR_BROADCAST,
1041                  * and the primary interface supports broadcast,
1042                  * choose the broadcast address for that interface.
1043                  */
1044                 if (faddr.s_addr == INADDR_ANY) {
1045                         IN_IFADDR_RLOCK(&in_ifa_tracker);
1046                         faddr =
1047                             IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
1048                         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
1049                         if (cred != NULL &&
1050                             (error = prison_get_ip4(cred, &faddr)) != 0)
1051                                 return (error);
1052                 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
1053                         IN_IFADDR_RLOCK(&in_ifa_tracker);
1054                         if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
1055                             IFF_BROADCAST)
1056                                 faddr = satosin(&TAILQ_FIRST(
1057                                     &V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
1058                         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
1059                 }
1060         }
1061         if (laddr.s_addr == INADDR_ANY) {
1062                 error = in_pcbladdr(inp, &faddr, &laddr, cred);
1063                 /*
1064                  * If the destination address is multicast and an outgoing
1065                  * interface has been set as a multicast option, prefer the
1066                  * address of that interface as our source address.
1067                  */
1068                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
1069                     inp->inp_moptions != NULL) {
1070                         struct ip_moptions *imo;
1071                         struct ifnet *ifp;
1072
1073                         imo = inp->inp_moptions;
1074                         if (imo->imo_multicast_ifp != NULL) {
1075                                 ifp = imo->imo_multicast_ifp;
1076                                 IN_IFADDR_RLOCK(&in_ifa_tracker);
1077                                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1078                                         if ((ia->ia_ifp == ifp) &&
1079                                             (cred == NULL ||
1080                                             prison_check_ip4(cred,
1081                                             &ia->ia_addr.sin_addr) == 0))
1082                                                 break;
1083                                 }
1084                                 if (ia == NULL)
1085                                         error = EADDRNOTAVAIL;
1086                                 else {
1087                                         laddr = ia->ia_addr.sin_addr;
1088                                         error = 0;
1089                                 }
1090                                 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
1091                         }
1092                 }
1093                 if (error)
1094                         return (error);
1095         }
1096         oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, fport,
1097             laddr, lport, 0, NULL);
1098         if (oinp != NULL) {
1099                 if (oinpp != NULL)
1100                         *oinpp = oinp;
1101                 return (EADDRINUSE);
1102         }
1103         if (lport == 0) {
1104                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
1105                     cred);
1106                 if (error)
1107                         return (error);
1108         }
1109         *laddrp = laddr.s_addr;
1110         *lportp = lport;
1111         *faddrp = faddr.s_addr;
1112         *fportp = fport;
1113         return (0);
1114 }
1115
1116 void
1117 in_pcbdisconnect(struct inpcb *inp)
1118 {
1119
1120         INP_WLOCK_ASSERT(inp);
1121         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
1122
1123         inp->inp_faddr.s_addr = INADDR_ANY;
1124         inp->inp_fport = 0;
1125         in_pcbrehash(inp);
1126 }
1127 #endif /* INET */
1128
1129 /*
1130  * in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
1131  * For most protocols, this will be invoked immediately prior to calling
1132  * in_pcbfree().  However, with TCP the inpcb may significantly outlive the
1133  * socket, in which case in_pcbfree() is deferred.
1134  */
1135 void
1136 in_pcbdetach(struct inpcb *inp)
1137 {
1138
1139         KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
1140
1141         inp->inp_socket->so_pcb = NULL;
1142         inp->inp_socket = NULL;
1143 }
1144
1145 /*
1146  * in_pcbref() bumps the reference count on an inpcb in order to maintain
1147  * stability of an inpcb pointer despite the inpcb lock being released.  This
1148  * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
1149  * but where the inpcb lock may already held, or when acquiring a reference
1150  * via a pcbgroup.
1151  *
1152  * in_pcbref() should be used only to provide brief memory stability, and
1153  * must always be followed by a call to INP_WLOCK() and in_pcbrele() to
1154  * garbage collect the inpcb if it has been in_pcbfree()'d from another
1155  * context.  Until in_pcbrele() has returned that the inpcb is still valid,
1156  * lock and rele are the *only* safe operations that may be performed on the
1157  * inpcb.
1158  *
1159  * While the inpcb will not be freed, releasing the inpcb lock means that the
1160  * connection's state may change, so the caller should be careful to
1161  * revalidate any cached state on reacquiring the lock.  Drop the reference
1162  * using in_pcbrele().
1163  */
1164 void
1165 in_pcbref(struct inpcb *inp)
1166 {
1167
1168         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1169
1170         refcount_acquire(&inp->inp_refcount);
1171 }
1172
1173 /*
1174  * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
1175  * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
1176  * return a flag indicating whether or not the inpcb remains valid.  If it is
1177  * valid, we return with the inpcb lock held.
1178  *
1179  * Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a
1180  * reference on an inpcb.  Historically more work was done here (actually, in
1181  * in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the
1182  * need for the pcbinfo lock in in_pcbrele().  Deferring the free is entirely
1183  * about memory stability (and continued use of the write lock).
1184  */
1185 int
1186 in_pcbrele_rlocked(struct inpcb *inp)
1187 {
1188         struct inpcbinfo *pcbinfo;
1189
1190         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1191
1192         INP_RLOCK_ASSERT(inp);
1193
1194         if (refcount_release(&inp->inp_refcount) == 0) {
1195                 /*
1196                  * If the inpcb has been freed, let the caller know, even if
1197                  * this isn't the last reference.
1198                  */
1199                 if (inp->inp_flags2 & INP_FREED) {
1200                         INP_RUNLOCK(inp);
1201                         return (1);
1202                 }
1203                 return (0);
1204         }
1205
1206         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1207
1208         INP_RUNLOCK(inp);
1209         pcbinfo = inp->inp_pcbinfo;
1210         uma_zfree(pcbinfo->ipi_zone, inp);
1211         return (1);
1212 }
1213
1214 int
1215 in_pcbrele_wlocked(struct inpcb *inp)
1216 {
1217         struct inpcbinfo *pcbinfo;
1218
1219         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
1220
1221         INP_WLOCK_ASSERT(inp);
1222
1223         if (refcount_release(&inp->inp_refcount) == 0)
1224                 return (0);
1225
1226         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1227
1228         INP_WUNLOCK(inp);
1229         pcbinfo = inp->inp_pcbinfo;
1230         uma_zfree(pcbinfo->ipi_zone, inp);
1231         return (1);
1232 }
1233
1234 /*
1235  * Temporary wrapper.
1236  */
1237 int
1238 in_pcbrele(struct inpcb *inp)
1239 {
1240
1241         return (in_pcbrele_wlocked(inp));
1242 }
1243
1244 /*
1245  * Unconditionally schedule an inpcb to be freed by decrementing its
1246  * reference count, which should occur only after the inpcb has been detached
1247  * from its socket.  If another thread holds a temporary reference (acquired
1248  * using in_pcbref()) then the free is deferred until that reference is
1249  * released using in_pcbrele(), but the inpcb is still unlocked.  Almost all
1250  * work, including removal from global lists, is done in this context, where
1251  * the pcbinfo lock is held.
1252  */
1253 void
1254 in_pcbfree(struct inpcb *inp)
1255 {
1256         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1257
1258         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
1259
1260 #ifdef INVARIANTS
1261         if (pcbinfo == &V_tcbinfo) {
1262                 INP_INFO_RLOCK_ASSERT(pcbinfo);
1263         } else {
1264                 INP_INFO_WLOCK_ASSERT(pcbinfo);
1265         }
1266 #endif
1267         INP_WLOCK_ASSERT(inp);
1268
1269         /* XXXRW: Do as much as possible here. */
1270 #ifdef IPSEC
1271         if (inp->inp_sp != NULL)
1272                 ipsec_delete_pcbpolicy(inp);
1273 #endif
1274         INP_LIST_WLOCK(pcbinfo);
1275         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
1276         in_pcbremlists(inp);
1277         INP_LIST_WUNLOCK(pcbinfo);
1278 #ifdef INET6
1279         if (inp->inp_vflag & INP_IPV6PROTO) {
1280                 ip6_freepcbopts(inp->in6p_outputopts);
1281                 if (inp->in6p_moptions != NULL)
1282                         ip6_freemoptions(inp->in6p_moptions);
1283         }
1284 #endif
1285         if (inp->inp_options)
1286                 (void)m_free(inp->inp_options);
1287 #ifdef INET
1288         if (inp->inp_moptions != NULL)
1289                 inp_freemoptions(inp->inp_moptions);
1290 #endif
1291         inp->inp_vflag = 0;
1292         inp->inp_flags2 |= INP_FREED;
1293         crfree(inp->inp_cred);
1294 #ifdef MAC
1295         mac_inpcb_destroy(inp);
1296 #endif
1297         if (!in_pcbrele_wlocked(inp))
1298                 INP_WUNLOCK(inp);
1299 }
1300
1301 /*
1302  * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
1303  * port reservation, and preventing it from being returned by inpcb lookups.
1304  *
1305  * It is used by TCP to mark an inpcb as unused and avoid future packet
1306  * delivery or event notification when a socket remains open but TCP has
1307  * closed.  This might occur as a result of a shutdown()-initiated TCP close
1308  * or a RST on the wire, and allows the port binding to be reused while still
1309  * maintaining the invariant that so_pcb always points to a valid inpcb until
1310  * in_pcbdetach().
1311  *
1312  * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
1313  * in_pcbnotifyall() and in_pcbpurgeif0()?
1314  */
1315 void
1316 in_pcbdrop(struct inpcb *inp)
1317 {
1318
1319         INP_WLOCK_ASSERT(inp);
1320
1321         /*
1322          * XXXRW: Possibly we should protect the setting of INP_DROPPED with
1323          * the hash lock...?
1324          */
1325         inp->inp_flags |= INP_DROPPED;
1326         if (inp->inp_flags & INP_INHASHLIST) {
1327                 struct inpcbport *phd = inp->inp_phd;
1328
1329                 INP_HASH_WLOCK(inp->inp_pcbinfo);
1330                 LIST_REMOVE(inp, inp_hash);
1331                 LIST_REMOVE(inp, inp_portlist);
1332                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
1333                         LIST_REMOVE(phd, phd_hash);
1334                         free(phd, M_PCB);
1335                 }
1336                 INP_HASH_WUNLOCK(inp->inp_pcbinfo);
1337                 inp->inp_flags &= ~INP_INHASHLIST;
1338 #ifdef PCBGROUP
1339                 in_pcbgroup_remove(inp);
1340 #endif
1341         }
1342 }
1343
1344 #ifdef INET
1345 /*
1346  * Common routines to return the socket addresses associated with inpcbs.
1347  */
1348 struct sockaddr *
1349 in_sockaddr(in_port_t port, struct in_addr *addr_p)
1350 {
1351         struct sockaddr_in *sin;
1352
1353         sin = malloc(sizeof *sin, M_SONAME,
1354                 M_WAITOK | M_ZERO);
1355         sin->sin_family = AF_INET;
1356         sin->sin_len = sizeof(*sin);
1357         sin->sin_addr = *addr_p;
1358         sin->sin_port = port;
1359
1360         return (struct sockaddr *)sin;
1361 }
1362
1363 int
1364 in_getsockaddr(struct socket *so, struct sockaddr **nam)
1365 {
1366         struct inpcb *inp;
1367         struct in_addr addr;
1368         in_port_t port;
1369
1370         inp = sotoinpcb(so);
1371         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
1372
1373         INP_RLOCK(inp);
1374         port = inp->inp_lport;
1375         addr = inp->inp_laddr;
1376         INP_RUNLOCK(inp);
1377
1378         *nam = in_sockaddr(port, &addr);
1379         return 0;
1380 }
1381
1382 int
1383 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
1384 {
1385         struct inpcb *inp;
1386         struct in_addr addr;
1387         in_port_t port;
1388
1389         inp = sotoinpcb(so);
1390         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
1391
1392         INP_RLOCK(inp);
1393         port = inp->inp_fport;
1394         addr = inp->inp_faddr;
1395         INP_RUNLOCK(inp);
1396
1397         *nam = in_sockaddr(port, &addr);
1398         return 0;
1399 }
1400
1401 void
1402 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
1403     struct inpcb *(*notify)(struct inpcb *, int))
1404 {
1405         struct inpcb *inp, *inp_temp;
1406
1407         INP_INFO_WLOCK(pcbinfo);
1408         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
1409                 INP_WLOCK(inp);
1410 #ifdef INET6
1411                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1412                         INP_WUNLOCK(inp);
1413                         continue;
1414                 }
1415 #endif
1416                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
1417                     inp->inp_socket == NULL) {
1418                         INP_WUNLOCK(inp);
1419                         continue;
1420                 }
1421                 if ((*notify)(inp, errno))
1422                         INP_WUNLOCK(inp);
1423         }
1424         INP_INFO_WUNLOCK(pcbinfo);
1425 }
1426
1427 void
1428 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
1429 {
1430         struct inpcb *inp;
1431         struct ip_moptions *imo;
1432         int i, gap;
1433
1434         INP_INFO_WLOCK(pcbinfo);
1435         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
1436                 INP_WLOCK(inp);
1437                 imo = inp->inp_moptions;
1438                 if ((inp->inp_vflag & INP_IPV4) &&
1439                     imo != NULL) {
1440                         /*
1441                          * Unselect the outgoing interface if it is being
1442                          * detached.
1443                          */
1444                         if (imo->imo_multicast_ifp == ifp)
1445                                 imo->imo_multicast_ifp = NULL;
1446
1447                         /*
1448                          * Drop multicast group membership if we joined
1449                          * through the interface being detached.
1450                          */
1451                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
1452                             i++) {
1453                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
1454                                         in_delmulti(imo->imo_membership[i]);
1455                                         gap++;
1456                                 } else if (gap != 0)
1457                                         imo->imo_membership[i - gap] =
1458                                             imo->imo_membership[i];
1459                         }
1460                         imo->imo_num_memberships -= gap;
1461                 }
1462                 INP_WUNLOCK(inp);
1463         }
1464         INP_INFO_WUNLOCK(pcbinfo);
1465 }
1466
1467 /*
1468  * Lookup a PCB based on the local address and port.  Caller must hold the
1469  * hash lock.  No inpcb locks or references are acquired.
1470  */
1471 #define INP_LOOKUP_MAPPED_PCB_COST      3
1472 struct inpcb *
1473 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
1474     u_short lport, int lookupflags, struct ucred *cred)
1475 {
1476         struct inpcb *inp;
1477 #ifdef INET6
1478         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
1479 #else
1480         int matchwild = 3;
1481 #endif
1482         int wildcard;
1483
1484         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1485             ("%s: invalid lookup flags %d", __func__, lookupflags));
1486
1487         INP_HASH_LOCK_ASSERT(pcbinfo);
1488
1489         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
1490                 struct inpcbhead *head;
1491                 /*
1492                  * Look for an unconnected (wildcard foreign addr) PCB that
1493                  * matches the local address and port we're looking for.
1494                  */
1495                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1496                     0, pcbinfo->ipi_hashmask)];
1497                 LIST_FOREACH(inp, head, inp_hash) {
1498 #ifdef INET6
1499                         /* XXX inp locking */
1500                         if ((inp->inp_vflag & INP_IPV4) == 0)
1501                                 continue;
1502 #endif
1503                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
1504                             inp->inp_laddr.s_addr == laddr.s_addr &&
1505                             inp->inp_lport == lport) {
1506                                 /*
1507                                  * Found?
1508                                  */
1509                                 if (cred == NULL ||
1510                                     prison_equal_ip4(cred->cr_prison,
1511                                         inp->inp_cred->cr_prison))
1512                                         return (inp);
1513                         }
1514                 }
1515                 /*
1516                  * Not found.
1517                  */
1518                 return (NULL);
1519         } else {
1520                 struct inpcbporthead *porthash;
1521                 struct inpcbport *phd;
1522                 struct inpcb *match = NULL;
1523                 /*
1524                  * Best fit PCB lookup.
1525                  *
1526                  * First see if this local port is in use by looking on the
1527                  * port hash list.
1528                  */
1529                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
1530                     pcbinfo->ipi_porthashmask)];
1531                 LIST_FOREACH(phd, porthash, phd_hash) {
1532                         if (phd->phd_port == lport)
1533                                 break;
1534                 }
1535                 if (phd != NULL) {
1536                         /*
1537                          * Port is in use by one or more PCBs. Look for best
1538                          * fit.
1539                          */
1540                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1541                                 wildcard = 0;
1542                                 if (cred != NULL &&
1543                                     !prison_equal_ip4(inp->inp_cred->cr_prison,
1544                                         cred->cr_prison))
1545                                         continue;
1546 #ifdef INET6
1547                                 /* XXX inp locking */
1548                                 if ((inp->inp_vflag & INP_IPV4) == 0)
1549                                         continue;
1550                                 /*
1551                                  * We never select the PCB that has
1552                                  * INP_IPV6 flag and is bound to :: if
1553                                  * we have another PCB which is bound
1554                                  * to 0.0.0.0.  If a PCB has the
1555                                  * INP_IPV6 flag, then we set its cost
1556                                  * higher than IPv4 only PCBs.
1557                                  *
1558                                  * Note that the case only happens
1559                                  * when a socket is bound to ::, under
1560                                  * the condition that the use of the
1561                                  * mapped address is allowed.
1562                                  */
1563                                 if ((inp->inp_vflag & INP_IPV6) != 0)
1564                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
1565 #endif
1566                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
1567                                         wildcard++;
1568                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
1569                                         if (laddr.s_addr == INADDR_ANY)
1570                                                 wildcard++;
1571                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
1572                                                 continue;
1573                                 } else {
1574                                         if (laddr.s_addr != INADDR_ANY)
1575                                                 wildcard++;
1576                                 }
1577                                 if (wildcard < matchwild) {
1578                                         match = inp;
1579                                         matchwild = wildcard;
1580                                         if (matchwild == 0)
1581                                                 break;
1582                                 }
1583                         }
1584                 }
1585                 return (match);
1586         }
1587 }
1588 #undef INP_LOOKUP_MAPPED_PCB_COST
1589
1590 #ifdef PCBGROUP
1591 /*
1592  * Lookup PCB in hash list, using pcbgroup tables.
1593  */
1594 static struct inpcb *
1595 in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
1596     struct in_addr faddr, u_int fport_arg, struct in_addr laddr,
1597     u_int lport_arg, int lookupflags, struct ifnet *ifp)
1598 {
1599         struct inpcbhead *head;
1600         struct inpcb *inp, *tmpinp;
1601         u_short fport = fport_arg, lport = lport_arg;
1602
1603         /*
1604          * First look for an exact match.
1605          */
1606         tmpinp = NULL;
1607         INP_GROUP_LOCK(pcbgroup);
1608         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1609             pcbgroup->ipg_hashmask)];
1610         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
1611 #ifdef INET6
1612                 /* XXX inp locking */
1613                 if ((inp->inp_vflag & INP_IPV4) == 0)
1614                         continue;
1615 #endif
1616                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1617                     inp->inp_laddr.s_addr == laddr.s_addr &&
1618                     inp->inp_fport == fport &&
1619                     inp->inp_lport == lport) {
1620                         /*
1621                          * XXX We should be able to directly return
1622                          * the inp here, without any checks.
1623                          * Well unless both bound with SO_REUSEPORT?
1624                          */
1625                         if (prison_flag(inp->inp_cred, PR_IP4))
1626                                 goto found;
1627                         if (tmpinp == NULL)
1628                                 tmpinp = inp;
1629                 }
1630         }
1631         if (tmpinp != NULL) {
1632                 inp = tmpinp;
1633                 goto found;
1634         }
1635
1636 #ifdef  RSS
1637         /*
1638          * For incoming connections, we may wish to do a wildcard
1639          * match for an RSS-local socket.
1640          */
1641         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1642                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1643 #ifdef INET6
1644                 struct inpcb *local_wild_mapped = NULL;
1645 #endif
1646                 struct inpcb *jail_wild = NULL;
1647                 struct inpcbhead *head;
1648                 int injail;
1649
1650                 /*
1651                  * Order of socket selection - we always prefer jails.
1652                  *      1. jailed, non-wild.
1653                  *      2. jailed, wild.
1654                  *      3. non-jailed, non-wild.
1655                  *      4. non-jailed, wild.
1656                  */
1657
1658                 head = &pcbgroup->ipg_hashbase[INP_PCBHASH(INADDR_ANY,
1659                     lport, 0, pcbgroup->ipg_hashmask)];
1660                 LIST_FOREACH(inp, head, inp_pcbgrouphash) {
1661 #ifdef INET6
1662                         /* XXX inp locking */
1663                         if ((inp->inp_vflag & INP_IPV4) == 0)
1664                                 continue;
1665 #endif
1666                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1667                             inp->inp_lport != lport)
1668                                 continue;
1669
1670                         injail = prison_flag(inp->inp_cred, PR_IP4);
1671                         if (injail) {
1672                                 if (prison_check_ip4(inp->inp_cred,
1673                                     &laddr) != 0)
1674                                         continue;
1675                         } else {
1676                                 if (local_exact != NULL)
1677                                         continue;
1678                         }
1679
1680                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1681                                 if (injail)
1682                                         goto found;
1683                                 else
1684                                         local_exact = inp;
1685                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1686 #ifdef INET6
1687                                 /* XXX inp locking, NULL check */
1688                                 if (inp->inp_vflag & INP_IPV6PROTO)
1689                                         local_wild_mapped = inp;
1690                                 else
1691 #endif
1692                                         if (injail)
1693                                                 jail_wild = inp;
1694                                         else
1695                                                 local_wild = inp;
1696                         }
1697                 } /* LIST_FOREACH */
1698
1699                 inp = jail_wild;
1700                 if (inp == NULL)
1701                         inp = local_exact;
1702                 if (inp == NULL)
1703                         inp = local_wild;
1704 #ifdef INET6
1705                 if (inp == NULL)
1706                         inp = local_wild_mapped;
1707 #endif
1708                 if (inp != NULL)
1709                         goto found;
1710         }
1711 #endif
1712
1713         /*
1714          * Then look for a wildcard match, if requested.
1715          */
1716         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1717                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1718 #ifdef INET6
1719                 struct inpcb *local_wild_mapped = NULL;
1720 #endif
1721                 struct inpcb *jail_wild = NULL;
1722                 struct inpcbhead *head;
1723                 int injail;
1724
1725                 /*
1726                  * Order of socket selection - we always prefer jails.
1727                  *      1. jailed, non-wild.
1728                  *      2. jailed, wild.
1729                  *      3. non-jailed, non-wild.
1730                  *      4. non-jailed, wild.
1731                  */
1732                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
1733                     0, pcbinfo->ipi_wildmask)];
1734                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
1735 #ifdef INET6
1736                         /* XXX inp locking */
1737                         if ((inp->inp_vflag & INP_IPV4) == 0)
1738                                 continue;
1739 #endif
1740                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1741                             inp->inp_lport != lport)
1742                                 continue;
1743
1744                         injail = prison_flag(inp->inp_cred, PR_IP4);
1745                         if (injail) {
1746                                 if (prison_check_ip4(inp->inp_cred,
1747                                     &laddr) != 0)
1748                                         continue;
1749                         } else {
1750                                 if (local_exact != NULL)
1751                                         continue;
1752                         }
1753
1754                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1755                                 if (injail)
1756                                         goto found;
1757                                 else
1758                                         local_exact = inp;
1759                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1760 #ifdef INET6
1761                                 /* XXX inp locking, NULL check */
1762                                 if (inp->inp_vflag & INP_IPV6PROTO)
1763                                         local_wild_mapped = inp;
1764                                 else
1765 #endif
1766                                         if (injail)
1767                                                 jail_wild = inp;
1768                                         else
1769                                                 local_wild = inp;
1770                         }
1771                 } /* LIST_FOREACH */
1772                 inp = jail_wild;
1773                 if (inp == NULL)
1774                         inp = local_exact;
1775                 if (inp == NULL)
1776                         inp = local_wild;
1777 #ifdef INET6
1778                 if (inp == NULL)
1779                         inp = local_wild_mapped;
1780 #endif
1781                 if (inp != NULL)
1782                         goto found;
1783         } /* if (lookupflags & INPLOOKUP_WILDCARD) */
1784         INP_GROUP_UNLOCK(pcbgroup);
1785         return (NULL);
1786
1787 found:
1788         in_pcbref(inp);
1789         INP_GROUP_UNLOCK(pcbgroup);
1790         if (lookupflags & INPLOOKUP_WLOCKPCB) {
1791                 INP_WLOCK(inp);
1792                 if (in_pcbrele_wlocked(inp))
1793                         return (NULL);
1794         } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1795                 INP_RLOCK(inp);
1796                 if (in_pcbrele_rlocked(inp))
1797                         return (NULL);
1798         } else
1799                 panic("%s: locking bug", __func__);
1800         return (inp);
1801 }
1802 #endif /* PCBGROUP */
1803
1804 /*
1805  * Lookup PCB in hash list, using pcbinfo tables.  This variation assumes
1806  * that the caller has locked the hash list, and will not perform any further
1807  * locking or reference operations on either the hash list or the connection.
1808  */
1809 static struct inpcb *
1810 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1811     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags,
1812     struct ifnet *ifp)
1813 {
1814         struct inpcbhead *head;
1815         struct inpcb *inp, *tmpinp;
1816         u_short fport = fport_arg, lport = lport_arg;
1817
1818         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1819             ("%s: invalid lookup flags %d", __func__, lookupflags));
1820
1821         INP_HASH_LOCK_ASSERT(pcbinfo);
1822
1823         /*
1824          * First look for an exact match.
1825          */
1826         tmpinp = NULL;
1827         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
1828             pcbinfo->ipi_hashmask)];
1829         LIST_FOREACH(inp, head, inp_hash) {
1830 #ifdef INET6
1831                 /* XXX inp locking */
1832                 if ((inp->inp_vflag & INP_IPV4) == 0)
1833                         continue;
1834 #endif
1835                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
1836                     inp->inp_laddr.s_addr == laddr.s_addr &&
1837                     inp->inp_fport == fport &&
1838                     inp->inp_lport == lport) {
1839                         /*
1840                          * XXX We should be able to directly return
1841                          * the inp here, without any checks.
1842                          * Well unless both bound with SO_REUSEPORT?
1843                          */
1844                         if (prison_flag(inp->inp_cred, PR_IP4))
1845                                 return (inp);
1846                         if (tmpinp == NULL)
1847                                 tmpinp = inp;
1848                 }
1849         }
1850         if (tmpinp != NULL)
1851                 return (tmpinp);
1852
1853         /*
1854          * Then look for a wildcard match, if requested.
1855          */
1856         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1857                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1858 #ifdef INET6
1859                 struct inpcb *local_wild_mapped = NULL;
1860 #endif
1861                 struct inpcb *jail_wild = NULL;
1862                 int injail;
1863
1864                 /*
1865                  * Order of socket selection - we always prefer jails.
1866                  *      1. jailed, non-wild.
1867                  *      2. jailed, wild.
1868                  *      3. non-jailed, non-wild.
1869                  *      4. non-jailed, wild.
1870                  */
1871
1872                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1873                     0, pcbinfo->ipi_hashmask)];
1874                 LIST_FOREACH(inp, head, inp_hash) {
1875 #ifdef INET6
1876                         /* XXX inp locking */
1877                         if ((inp->inp_vflag & INP_IPV4) == 0)
1878                                 continue;
1879 #endif
1880                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
1881                             inp->inp_lport != lport)
1882                                 continue;
1883
1884                         injail = prison_flag(inp->inp_cred, PR_IP4);
1885                         if (injail) {
1886                                 if (prison_check_ip4(inp->inp_cred,
1887                                     &laddr) != 0)
1888                                         continue;
1889                         } else {
1890                                 if (local_exact != NULL)
1891                                         continue;
1892                         }
1893
1894                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
1895                                 if (injail)
1896                                         return (inp);
1897                                 else
1898                                         local_exact = inp;
1899                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
1900 #ifdef INET6
1901                                 /* XXX inp locking, NULL check */
1902                                 if (inp->inp_vflag & INP_IPV6PROTO)
1903                                         local_wild_mapped = inp;
1904                                 else
1905 #endif
1906                                         if (injail)
1907                                                 jail_wild = inp;
1908                                         else
1909                                                 local_wild = inp;
1910                         }
1911                 } /* LIST_FOREACH */
1912                 if (jail_wild != NULL)
1913                         return (jail_wild);
1914                 if (local_exact != NULL)
1915                         return (local_exact);
1916                 if (local_wild != NULL)
1917                         return (local_wild);
1918 #ifdef INET6
1919                 if (local_wild_mapped != NULL)
1920                         return (local_wild_mapped);
1921 #endif
1922         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1923
1924         return (NULL);
1925 }
1926
1927 /*
1928  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1929  * hash list lock, and will return the inpcb locked (i.e., requires
1930  * INPLOOKUP_LOCKPCB).
1931  */
1932 static struct inpcb *
1933 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
1934     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
1935     struct ifnet *ifp)
1936 {
1937         struct inpcb *inp;
1938
1939         INP_HASH_RLOCK(pcbinfo);
1940         inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1941             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1942         if (inp != NULL) {
1943                 in_pcbref(inp);
1944                 INP_HASH_RUNLOCK(pcbinfo);
1945                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1946                         INP_WLOCK(inp);
1947                         if (in_pcbrele_wlocked(inp))
1948                                 return (NULL);
1949                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1950                         INP_RLOCK(inp);
1951                         if (in_pcbrele_rlocked(inp))
1952                                 return (NULL);
1953                 } else
1954                         panic("%s: locking bug", __func__);
1955         } else
1956                 INP_HASH_RUNLOCK(pcbinfo);
1957         return (inp);
1958 }
1959
1960 /*
1961  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1962  * from which a pre-calculated hash value may be extracted.
1963  *
1964  * Possibly more of this logic should be in in_pcbgroup.c.
1965  */
1966 struct inpcb *
1967 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport,
1968     struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1969 {
1970 #if defined(PCBGROUP) && !defined(RSS)
1971         struct inpcbgroup *pcbgroup;
1972 #endif
1973
1974         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1975             ("%s: invalid lookup flags %d", __func__, lookupflags));
1976         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1977             ("%s: LOCKPCB not set", __func__));
1978
1979         /*
1980          * When not using RSS, use connection groups in preference to the
1981          * reservation table when looking up 4-tuples.  When using RSS, just
1982          * use the reservation table, due to the cost of the Toeplitz hash
1983          * in software.
1984          *
1985          * XXXRW: This policy belongs in the pcbgroup code, as in principle
1986          * we could be doing RSS with a non-Toeplitz hash that is affordable
1987          * in software.
1988          */
1989 #if defined(PCBGROUP) && !defined(RSS)
1990         if (in_pcbgroup_enabled(pcbinfo)) {
1991                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1992                     fport);
1993                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1994                     laddr, lport, lookupflags, ifp));
1995         }
1996 #endif
1997         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1998             lookupflags, ifp));
1999 }
2000
2001 struct inpcb *
2002 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr,
2003     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
2004     struct ifnet *ifp, struct mbuf *m)
2005 {
2006 #ifdef PCBGROUP
2007         struct inpcbgroup *pcbgroup;
2008 #endif
2009
2010         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
2011             ("%s: invalid lookup flags %d", __func__, lookupflags));
2012         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
2013             ("%s: LOCKPCB not set", __func__));
2014
2015 #ifdef PCBGROUP
2016         /*
2017          * If we can use a hardware-generated hash to look up the connection
2018          * group, use that connection group to find the inpcb.  Otherwise
2019          * fall back on a software hash -- or the reservation table if we're
2020          * using RSS.
2021          *
2022          * XXXRW: As above, that policy belongs in the pcbgroup code.
2023          */
2024         if (in_pcbgroup_enabled(pcbinfo) &&
2025             !(M_HASHTYPE_TEST(m, M_HASHTYPE_NONE))) {
2026                 pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
2027                     m->m_pkthdr.flowid);
2028                 if (pcbgroup != NULL)
2029                         return (in_pcblookup_group(pcbinfo, pcbgroup, faddr,
2030                             fport, laddr, lport, lookupflags, ifp));
2031 #ifndef RSS
2032                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
2033                     fport);
2034                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
2035                     laddr, lport, lookupflags, ifp));
2036 #endif
2037         }
2038 #endif
2039         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
2040             lookupflags, ifp));
2041 }
2042 #endif /* INET */
2043
2044 /*
2045  * Insert PCB onto various hash lists.
2046  */
2047 static int
2048 in_pcbinshash_internal(struct inpcb *inp, int do_pcbgroup_update)
2049 {
2050         struct inpcbhead *pcbhash;
2051         struct inpcbporthead *pcbporthash;
2052         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
2053         struct inpcbport *phd;
2054         u_int32_t hashkey_faddr;
2055
2056         INP_WLOCK_ASSERT(inp);
2057         INP_HASH_WLOCK_ASSERT(pcbinfo);
2058
2059         KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
2060             ("in_pcbinshash: INP_INHASHLIST"));
2061
2062 #ifdef INET6
2063         if (inp->inp_vflag & INP_IPV6)
2064                 hashkey_faddr = INP6_PCBHASHKEY(&inp->in6p_faddr);
2065         else
2066 #endif
2067         hashkey_faddr = inp->inp_faddr.s_addr;
2068
2069         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
2070                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
2071
2072         pcbporthash = &pcbinfo->ipi_porthashbase[
2073             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
2074
2075         /*
2076          * Go through port list and look for a head for this lport.
2077          */
2078         LIST_FOREACH(phd, pcbporthash, phd_hash) {
2079                 if (phd->phd_port == inp->inp_lport)
2080                         break;
2081         }
2082         /*
2083          * If none exists, malloc one and tack it on.
2084          */
2085         if (phd == NULL) {
2086                 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
2087                 if (phd == NULL) {
2088                         return (ENOBUFS); /* XXX */
2089                 }
2090                 phd->phd_port = inp->inp_lport;
2091                 LIST_INIT(&phd->phd_pcblist);
2092                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
2093         }
2094         inp->inp_phd = phd;
2095         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
2096         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
2097         inp->inp_flags |= INP_INHASHLIST;
2098 #ifdef PCBGROUP
2099         if (do_pcbgroup_update)
2100                 in_pcbgroup_update(inp);
2101 #endif
2102         return (0);
2103 }
2104
2105 /*
2106  * For now, there are two public interfaces to insert an inpcb into the hash
2107  * lists -- one that does update pcbgroups, and one that doesn't.  The latter
2108  * is used only in the TCP syncache, where in_pcbinshash is called before the
2109  * full 4-tuple is set for the inpcb, and we don't want to install in the
2110  * pcbgroup until later.
2111  *
2112  * XXXRW: This seems like a misfeature.  in_pcbinshash should always update
2113  * connection groups, and partially initialised inpcbs should not be exposed
2114  * to either reservation hash tables or pcbgroups.
2115  */
2116 int
2117 in_pcbinshash(struct inpcb *inp)
2118 {
2119
2120         return (in_pcbinshash_internal(inp, 1));
2121 }
2122
2123 int
2124 in_pcbinshash_nopcbgroup(struct inpcb *inp)
2125 {
2126
2127         return (in_pcbinshash_internal(inp, 0));
2128 }
2129
2130 /*
2131  * Move PCB to the proper hash bucket when { faddr, fport } have  been
2132  * changed. NOTE: This does not handle the case of the lport changing (the
2133  * hashed port list would have to be updated as well), so the lport must
2134  * not change after in_pcbinshash() has been called.
2135  */
2136 void
2137 in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m)
2138 {
2139         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
2140         struct inpcbhead *head;
2141         u_int32_t hashkey_faddr;
2142
2143         INP_WLOCK_ASSERT(inp);
2144         INP_HASH_WLOCK_ASSERT(pcbinfo);
2145
2146         KASSERT(inp->inp_flags & INP_INHASHLIST,
2147             ("in_pcbrehash: !INP_INHASHLIST"));
2148
2149 #ifdef INET6
2150         if (inp->inp_vflag & INP_IPV6)
2151                 hashkey_faddr = INP6_PCBHASHKEY(&inp->in6p_faddr);
2152         else
2153 #endif
2154         hashkey_faddr = inp->inp_faddr.s_addr;
2155
2156         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
2157                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
2158
2159         LIST_REMOVE(inp, inp_hash);
2160         LIST_INSERT_HEAD(head, inp, inp_hash);
2161
2162 #ifdef PCBGROUP
2163         if (m != NULL)
2164                 in_pcbgroup_update_mbuf(inp, m);
2165         else
2166                 in_pcbgroup_update(inp);
2167 #endif
2168 }
2169
2170 void
2171 in_pcbrehash(struct inpcb *inp)
2172 {
2173
2174         in_pcbrehash_mbuf(inp, NULL);
2175 }
2176
2177 /*
2178  * Remove PCB from various lists.
2179  */
2180 static void
2181 in_pcbremlists(struct inpcb *inp)
2182 {
2183         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
2184
2185 #ifdef INVARIANTS
2186         if (pcbinfo == &V_tcbinfo) {
2187                 INP_INFO_RLOCK_ASSERT(pcbinfo);
2188         } else {
2189                 INP_INFO_WLOCK_ASSERT(pcbinfo);
2190         }
2191 #endif
2192
2193         INP_WLOCK_ASSERT(inp);
2194         INP_LIST_WLOCK_ASSERT(pcbinfo);
2195
2196         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
2197         if (inp->inp_flags & INP_INHASHLIST) {
2198                 struct inpcbport *phd = inp->inp_phd;
2199
2200                 INP_HASH_WLOCK(pcbinfo);
2201                 LIST_REMOVE(inp, inp_hash);
2202                 LIST_REMOVE(inp, inp_portlist);
2203                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
2204                         LIST_REMOVE(phd, phd_hash);
2205                         free(phd, M_PCB);
2206                 }
2207                 INP_HASH_WUNLOCK(pcbinfo);
2208                 inp->inp_flags &= ~INP_INHASHLIST;
2209         }
2210         LIST_REMOVE(inp, inp_list);
2211         pcbinfo->ipi_count--;
2212 #ifdef PCBGROUP
2213         in_pcbgroup_remove(inp);
2214 #endif
2215 }
2216
2217 /*
2218  * A set label operation has occurred at the socket layer, propagate the
2219  * label change into the in_pcb for the socket.
2220  */
2221 void
2222 in_pcbsosetlabel(struct socket *so)
2223 {
2224 #ifdef MAC
2225         struct inpcb *inp;
2226
2227         inp = sotoinpcb(so);
2228         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
2229
2230         INP_WLOCK(inp);
2231         SOCK_LOCK(so);
2232         mac_inpcb_sosetlabel(so, inp);
2233         SOCK_UNLOCK(so);
2234         INP_WUNLOCK(inp);
2235 #endif
2236 }
2237
2238 /*
2239  * ipport_tick runs once per second, determining if random port allocation
2240  * should be continued.  If more than ipport_randomcps ports have been
2241  * allocated in the last second, then we return to sequential port
2242  * allocation. We return to random allocation only once we drop below
2243  * ipport_randomcps for at least ipport_randomtime seconds.
2244  */
2245 static void
2246 ipport_tick(void *xtp)
2247 {
2248         VNET_ITERATOR_DECL(vnet_iter);
2249
2250         VNET_LIST_RLOCK_NOSLEEP();
2251         VNET_FOREACH(vnet_iter) {
2252                 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
2253                 if (V_ipport_tcpallocs <=
2254                     V_ipport_tcplastcount + V_ipport_randomcps) {
2255                         if (V_ipport_stoprandom > 0)
2256                                 V_ipport_stoprandom--;
2257                 } else
2258                         V_ipport_stoprandom = V_ipport_randomtime;
2259                 V_ipport_tcplastcount = V_ipport_tcpallocs;
2260                 CURVNET_RESTORE();
2261         }
2262         VNET_LIST_RUNLOCK_NOSLEEP();
2263         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
2264 }
2265
2266 static void
2267 ip_fini(void *xtp)
2268 {
2269
2270         callout_stop(&ipport_tick_callout);
2271 }
2272
2273 /*
2274  * The ipport_callout should start running at about the time we attach the
2275  * inet or inet6 domains.
2276  */
2277 static void
2278 ipport_tick_init(const void *unused __unused)
2279 {
2280
2281         /* Start ipport_tick. */
2282         callout_init(&ipport_tick_callout, 1);
2283         callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL);
2284         EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL,
2285                 SHUTDOWN_PRI_DEFAULT);
2286 }
2287 SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
2288     ipport_tick_init, NULL);
2289
2290 void
2291 inp_wlock(struct inpcb *inp)
2292 {
2293
2294         INP_WLOCK(inp);
2295 }
2296
2297 void
2298 inp_wunlock(struct inpcb *inp)
2299 {
2300
2301         INP_WUNLOCK(inp);
2302 }
2303
2304 void
2305 inp_rlock(struct inpcb *inp)
2306 {
2307
2308         INP_RLOCK(inp);
2309 }
2310
2311 void
2312 inp_runlock(struct inpcb *inp)
2313 {
2314
2315         INP_RUNLOCK(inp);
2316 }
2317
2318 #ifdef INVARIANTS
2319 void
2320 inp_lock_assert(struct inpcb *inp)
2321 {
2322
2323         INP_WLOCK_ASSERT(inp);
2324 }
2325
2326 void
2327 inp_unlock_assert(struct inpcb *inp)
2328 {
2329
2330         INP_UNLOCK_ASSERT(inp);
2331 }
2332 #endif
2333
2334 void
2335 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
2336 {
2337         struct inpcb *inp;
2338
2339         INP_INFO_WLOCK(&V_tcbinfo);
2340         LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
2341                 INP_WLOCK(inp);
2342                 func(inp, arg);
2343                 INP_WUNLOCK(inp);
2344         }
2345         INP_INFO_WUNLOCK(&V_tcbinfo);
2346 }
2347
2348 struct socket *
2349 inp_inpcbtosocket(struct inpcb *inp)
2350 {
2351
2352         INP_WLOCK_ASSERT(inp);
2353         return (inp->inp_socket);
2354 }
2355
2356 struct tcpcb *
2357 inp_inpcbtotcpcb(struct inpcb *inp)
2358 {
2359
2360         INP_WLOCK_ASSERT(inp);
2361         return ((struct tcpcb *)inp->inp_ppcb);
2362 }
2363
2364 int
2365 inp_ip_tos_get(const struct inpcb *inp)
2366 {
2367
2368         return (inp->inp_ip_tos);
2369 }
2370
2371 void
2372 inp_ip_tos_set(struct inpcb *inp, int val)
2373 {
2374
2375         inp->inp_ip_tos = val;
2376 }
2377
2378 void
2379 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
2380     uint32_t *faddr, uint16_t *fp)
2381 {
2382
2383         INP_LOCK_ASSERT(inp);
2384         *laddr = inp->inp_laddr.s_addr;
2385         *faddr = inp->inp_faddr.s_addr;
2386         *lp = inp->inp_lport;
2387         *fp = inp->inp_fport;
2388 }
2389
2390 struct inpcb *
2391 so_sotoinpcb(struct socket *so)
2392 {
2393
2394         return (sotoinpcb(so));
2395 }
2396
2397 struct tcpcb *
2398 so_sototcpcb(struct socket *so)
2399 {
2400
2401         return (sototcpcb(so));
2402 }
2403
2404 #ifdef DDB
2405 static void
2406 db_print_indent(int indent)
2407 {
2408         int i;
2409
2410         for (i = 0; i < indent; i++)
2411                 db_printf(" ");
2412 }
2413
2414 static void
2415 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
2416 {
2417         char faddr_str[48], laddr_str[48];
2418
2419         db_print_indent(indent);
2420         db_printf("%s at %p\n", name, inc);
2421
2422         indent += 2;
2423
2424 #ifdef INET6
2425         if (inc->inc_flags & INC_ISIPV6) {
2426                 /* IPv6. */
2427                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
2428                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
2429         } else
2430 #endif
2431         {
2432                 /* IPv4. */
2433                 inet_ntoa_r(inc->inc_laddr, laddr_str);
2434                 inet_ntoa_r(inc->inc_faddr, faddr_str);
2435         }
2436         db_print_indent(indent);
2437         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
2438             ntohs(inc->inc_lport));
2439         db_print_indent(indent);
2440         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
2441             ntohs(inc->inc_fport));
2442 }
2443
2444 static void
2445 db_print_inpflags(int inp_flags)
2446 {
2447         int comma;
2448
2449         comma = 0;
2450         if (inp_flags & INP_RECVOPTS) {
2451                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
2452                 comma = 1;
2453         }
2454         if (inp_flags & INP_RECVRETOPTS) {
2455                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
2456                 comma = 1;
2457         }
2458         if (inp_flags & INP_RECVDSTADDR) {
2459                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
2460                 comma = 1;
2461         }
2462         if (inp_flags & INP_HDRINCL) {
2463                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
2464                 comma = 1;
2465         }
2466         if (inp_flags & INP_HIGHPORT) {
2467                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
2468                 comma = 1;
2469         }
2470         if (inp_flags & INP_LOWPORT) {
2471                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
2472                 comma = 1;
2473         }
2474         if (inp_flags & INP_ANONPORT) {
2475                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
2476                 comma = 1;
2477         }
2478         if (inp_flags & INP_RECVIF) {
2479                 db_printf("%sINP_RECVIF", comma ? ", " : "");
2480                 comma = 1;
2481         }
2482         if (inp_flags & INP_MTUDISC) {
2483                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
2484                 comma = 1;
2485         }
2486         if (inp_flags & INP_RECVTTL) {
2487                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
2488                 comma = 1;
2489         }
2490         if (inp_flags & INP_DONTFRAG) {
2491                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
2492                 comma = 1;
2493         }
2494         if (inp_flags & INP_RECVTOS) {
2495                 db_printf("%sINP_RECVTOS", comma ? ", " : "");
2496                 comma = 1;
2497         }
2498         if (inp_flags & IN6P_IPV6_V6ONLY) {
2499                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
2500                 comma = 1;
2501         }
2502         if (inp_flags & IN6P_PKTINFO) {
2503                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
2504                 comma = 1;
2505         }
2506         if (inp_flags & IN6P_HOPLIMIT) {
2507                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
2508                 comma = 1;
2509         }
2510         if (inp_flags & IN6P_HOPOPTS) {
2511                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
2512                 comma = 1;
2513         }
2514         if (inp_flags & IN6P_DSTOPTS) {
2515                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
2516                 comma = 1;
2517         }
2518         if (inp_flags & IN6P_RTHDR) {
2519                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
2520                 comma = 1;
2521         }
2522         if (inp_flags & IN6P_RTHDRDSTOPTS) {
2523                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
2524                 comma = 1;
2525         }
2526         if (inp_flags & IN6P_TCLASS) {
2527                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
2528                 comma = 1;
2529         }
2530         if (inp_flags & IN6P_AUTOFLOWLABEL) {
2531                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
2532                 comma = 1;
2533         }
2534         if (inp_flags & INP_TIMEWAIT) {
2535                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
2536                 comma  = 1;
2537         }
2538         if (inp_flags & INP_ONESBCAST) {
2539                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
2540                 comma  = 1;
2541         }
2542         if (inp_flags & INP_DROPPED) {
2543                 db_printf("%sINP_DROPPED", comma ? ", " : "");
2544                 comma  = 1;
2545         }
2546         if (inp_flags & INP_SOCKREF) {
2547                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
2548                 comma  = 1;
2549         }
2550         if (inp_flags & IN6P_RFC2292) {
2551                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
2552                 comma = 1;
2553         }
2554         if (inp_flags & IN6P_MTU) {
2555                 db_printf("IN6P_MTU%s", comma ? ", " : "");
2556                 comma = 1;
2557         }
2558 }
2559
2560 static void
2561 db_print_inpvflag(u_char inp_vflag)
2562 {
2563         int comma;
2564
2565         comma = 0;
2566         if (inp_vflag & INP_IPV4) {
2567                 db_printf("%sINP_IPV4", comma ? ", " : "");
2568                 comma  = 1;
2569         }
2570         if (inp_vflag & INP_IPV6) {
2571                 db_printf("%sINP_IPV6", comma ? ", " : "");
2572                 comma  = 1;
2573         }
2574         if (inp_vflag & INP_IPV6PROTO) {
2575                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
2576                 comma  = 1;
2577         }
2578 }
2579
2580 static void
2581 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
2582 {
2583
2584         db_print_indent(indent);
2585         db_printf("%s at %p\n", name, inp);
2586
2587         indent += 2;
2588
2589         db_print_indent(indent);
2590         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
2591
2592         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
2593
2594         db_print_indent(indent);
2595         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
2596             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
2597
2598         db_print_indent(indent);
2599         db_printf("inp_label: %p   inp_flags: 0x%x (",
2600            inp->inp_label, inp->inp_flags);
2601         db_print_inpflags(inp->inp_flags);
2602         db_printf(")\n");
2603
2604         db_print_indent(indent);
2605         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
2606             inp->inp_vflag);
2607         db_print_inpvflag(inp->inp_vflag);
2608         db_printf(")\n");
2609
2610         db_print_indent(indent);
2611         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
2612             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
2613
2614         db_print_indent(indent);
2615 #ifdef INET6
2616         if (inp->inp_vflag & INP_IPV6) {
2617                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
2618                     "in6p_moptions: %p\n", inp->in6p_options,
2619                     inp->in6p_outputopts, inp->in6p_moptions);
2620                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
2621                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
2622                     inp->in6p_hops);
2623         } else
2624 #endif
2625         {
2626                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
2627                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
2628                     inp->inp_options, inp->inp_moptions);
2629         }
2630
2631         db_print_indent(indent);
2632         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
2633             (uintmax_t)inp->inp_gencnt);
2634 }
2635
2636 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
2637 {
2638         struct inpcb *inp;
2639
2640         if (!have_addr) {
2641                 db_printf("usage: show inpcb <addr>\n");
2642                 return;
2643         }
2644         inp = (struct inpcb *)addr;
2645
2646         db_print_inpcb(inp, "inpcb", 0);
2647 }
2648 #endif /* DDB */