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