The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_pcb.c

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    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: releng/8.0/sys/netinet/in_pcb.c 197229 2009-09-15 19:38:29Z qingli $");
   36 
   37 #include "opt_ddb.h"
   38 #include "opt_ipsec.h"
   39 #include "opt_inet6.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/malloc.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/domain.h>
   46 #include <sys/protosw.h>
   47 #include <sys/socket.h>
   48 #include <sys/socketvar.h>
   49 #include <sys/priv.h>
   50 #include <sys/proc.h>
   51 #include <sys/jail.h>
   52 #include <sys/kernel.h>
   53 #include <sys/sysctl.h>
   54 
   55 #ifdef DDB
   56 #include <ddb/ddb.h>
   57 #endif
   58 
   59 #include <vm/uma.h>
   60 
   61 #include <net/if.h>
   62 #include <net/if_types.h>
   63 #include <net/route.h>
   64 #include <net/vnet.h>
   65 
   66 #include <netinet/in.h>
   67 #include <netinet/in_pcb.h>
   68 #include <netinet/in_var.h>
   69 #include <netinet/ip_var.h>
   70 #include <netinet/tcp_var.h>
   71 #include <netinet/udp.h>
   72 #include <netinet/udp_var.h>
   73 #ifdef INET6
   74 #include <netinet/ip6.h>
   75 #include <netinet6/ip6_var.h>
   76 #endif /* INET6 */
   77 
   78 
   79 #ifdef IPSEC
   80 #include <netipsec/ipsec.h>
   81 #include <netipsec/key.h>
   82 #endif /* IPSEC */
   83 
   84 #include <security/mac/mac_framework.h>
   85 
   86 /*
   87  * These configure the range of local port addresses assigned to
   88  * "unspecified" outgoing connections/packets/whatever.
   89  */
   90 VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1;    /* 1023 */
   91 VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART;    /* 600 */
   92 VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST;     /* 10000 */
   93 VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST;       /* 65535 */
   94 VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO;      /* 49152 */
   95 VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO;        /* 65535 */
   96 
   97 /*
   98  * Reserved ports accessible only to root. There are significant
   99  * security considerations that must be accounted for when changing these,
  100  * but the security benefits can be great. Please be careful.
  101  */
  102 VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1;    /* 1023 */
  103 VNET_DEFINE(int, ipport_reservedlow);
  104 
  105 /* Variables dealing with random ephemeral port allocation. */
  106 VNET_DEFINE(int, ipport_randomized) = 1;        /* user controlled via sysctl */
  107 VNET_DEFINE(int, ipport_randomcps) = 10;        /* user controlled via sysctl */
  108 VNET_DEFINE(int, ipport_randomtime) = 45;       /* user controlled via sysctl */
  109 VNET_DEFINE(int, ipport_stoprandom);            /* toggled by ipport_tick */
  110 VNET_DEFINE(int, ipport_tcpallocs);
  111 static VNET_DEFINE(int, ipport_tcplastcount);
  112 
  113 #define V_ipport_tcplastcount           VNET(ipport_tcplastcount)
  114 
  115 #define RANGECHK(var, min, max) \
  116         if ((var) < (min)) { (var) = (min); } \
  117         else if ((var) > (max)) { (var) = (max); }
  118 
  119 static void     in_pcbremlists(struct inpcb *inp);
  120 
  121 static int
  122 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
  123 {
  124         int error;
  125 
  126 #ifdef VIMAGE
  127         error = vnet_sysctl_handle_int(oidp, arg1, arg2, req);
  128 #else
  129         error = sysctl_handle_int(oidp, arg1, arg2, req);
  130 #endif
  131         if (error == 0) {
  132                 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
  133                 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
  134                 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
  135                 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
  136                 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
  137                 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
  138         }
  139         return (error);
  140 }
  141 
  142 #undef RANGECHK
  143 
  144 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
  145 
  146 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst,
  147         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowfirstauto), 0,
  148         &sysctl_net_ipport_check, "I", "");
  149 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast,
  150         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowlastauto), 0,
  151         &sysctl_net_ipport_check, "I", "");
  152 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, first,
  153         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_firstauto), 0,
  154         &sysctl_net_ipport_check, "I", "");
  155 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, last,
  156         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lastauto), 0,
  157         &sysctl_net_ipport_check, "I", "");
  158 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst,
  159         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hifirstauto), 0,
  160         &sysctl_net_ipport_check, "I", "");
  161 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hilast,
  162         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hilastauto), 0,
  163         &sysctl_net_ipport_check, "I", "");
  164 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
  165         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedhigh), 0, "");
  166 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
  167         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, "");
  168 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
  169         &VNET_NAME(ipport_randomized), 0, "Enable random port allocation");
  170 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
  171         &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port "
  172         "allocations before switching to a sequental one");
  173 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
  174         &VNET_NAME(ipport_randomtime), 0,
  175         "Minimum time to keep sequental port "
  176         "allocation before switching to a random one");
  177 
  178 /*
  179  * in_pcb.c: manage the Protocol Control Blocks.
  180  *
  181  * NOTE: It is assumed that most of these functions will be called with
  182  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
  183  * functions often modify hash chains or addresses in pcbs.
  184  */
  185 
  186 /*
  187  * Allocate a PCB and associate it with the socket.
  188  * On success return with the PCB locked.
  189  */
  190 int
  191 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
  192 {
  193         struct inpcb *inp;
  194         int error;
  195 
  196         INP_INFO_WLOCK_ASSERT(pcbinfo);
  197         error = 0;
  198         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
  199         if (inp == NULL)
  200                 return (ENOBUFS);
  201         bzero(inp, inp_zero_size);
  202         inp->inp_pcbinfo = pcbinfo;
  203         inp->inp_socket = so;
  204         inp->inp_cred = crhold(so->so_cred);
  205         inp->inp_inc.inc_fibnum = so->so_fibnum;
  206 #ifdef MAC
  207         error = mac_inpcb_init(inp, M_NOWAIT);
  208         if (error != 0)
  209                 goto out;
  210         mac_inpcb_create(so, inp);
  211 #endif
  212 #ifdef IPSEC
  213         error = ipsec_init_policy(so, &inp->inp_sp);
  214         if (error != 0) {
  215 #ifdef MAC
  216                 mac_inpcb_destroy(inp);
  217 #endif
  218                 goto out;
  219         }
  220 #endif /*IPSEC*/
  221 #ifdef INET6
  222         if (INP_SOCKAF(so) == AF_INET6) {
  223                 inp->inp_vflag |= INP_IPV6PROTO;
  224                 if (V_ip6_v6only)
  225                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
  226         }
  227 #endif
  228         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
  229         pcbinfo->ipi_count++;
  230         so->so_pcb = (caddr_t)inp;
  231 #ifdef INET6
  232         if (V_ip6_auto_flowlabel)
  233                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
  234 #endif
  235         INP_WLOCK(inp);
  236         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
  237         inp->inp_refcount = 1;  /* Reference from the inpcbinfo */
  238 #if defined(IPSEC) || defined(MAC)
  239 out:
  240         if (error != 0) {
  241                 crfree(inp->inp_cred);
  242                 uma_zfree(pcbinfo->ipi_zone, inp);
  243         }
  244 #endif
  245         return (error);
  246 }
  247 
  248 int
  249 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
  250 {
  251         int anonport, error;
  252 
  253         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  254         INP_WLOCK_ASSERT(inp);
  255 
  256         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
  257                 return (EINVAL);
  258         anonport = inp->inp_lport == 0 && (nam == NULL ||
  259             ((struct sockaddr_in *)nam)->sin_port == 0);
  260         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
  261             &inp->inp_lport, cred);
  262         if (error)
  263                 return (error);
  264         if (in_pcbinshash(inp) != 0) {
  265                 inp->inp_laddr.s_addr = INADDR_ANY;
  266                 inp->inp_lport = 0;
  267                 return (EAGAIN);
  268         }
  269         if (anonport)
  270                 inp->inp_flags |= INP_ANONPORT;
  271         return (0);
  272 }
  273 
  274 /*
  275  * Set up a bind operation on a PCB, performing port allocation
  276  * as required, but do not actually modify the PCB. Callers can
  277  * either complete the bind by setting inp_laddr/inp_lport and
  278  * calling in_pcbinshash(), or they can just use the resulting
  279  * port and address to authorise the sending of a once-off packet.
  280  *
  281  * On error, the values of *laddrp and *lportp are not changed.
  282  */
  283 int
  284 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
  285     u_short *lportp, struct ucred *cred)
  286 {
  287         struct socket *so = inp->inp_socket;
  288         unsigned short *lastport;
  289         struct sockaddr_in *sin;
  290         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
  291         struct in_addr laddr;
  292         u_short lport = 0;
  293         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
  294         int error;
  295         int dorandom;
  296 
  297         /*
  298          * Because no actual state changes occur here, a global write lock on
  299          * the pcbinfo isn't required.
  300          */
  301         INP_INFO_LOCK_ASSERT(pcbinfo);
  302         INP_LOCK_ASSERT(inp);
  303 
  304         if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
  305                 return (EADDRNOTAVAIL);
  306         laddr.s_addr = *laddrp;
  307         if (nam != NULL && laddr.s_addr != INADDR_ANY)
  308                 return (EINVAL);
  309         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
  310                 wild = INPLOOKUP_WILDCARD;
  311         if (nam == NULL) {
  312                 if ((error = prison_local_ip4(cred, &laddr)) != 0)
  313                         return (error);
  314         } else {
  315                 sin = (struct sockaddr_in *)nam;
  316                 if (nam->sa_len != sizeof (*sin))
  317                         return (EINVAL);
  318 #ifdef notdef
  319                 /*
  320                  * We should check the family, but old programs
  321                  * incorrectly fail to initialize it.
  322                  */
  323                 if (sin->sin_family != AF_INET)
  324                         return (EAFNOSUPPORT);
  325 #endif
  326                 error = prison_local_ip4(cred, &sin->sin_addr);
  327                 if (error)
  328                         return (error);
  329                 if (sin->sin_port != *lportp) {
  330                         /* Don't allow the port to change. */
  331                         if (*lportp != 0)
  332                                 return (EINVAL);
  333                         lport = sin->sin_port;
  334                 }
  335                 /* NB: lport is left as 0 if the port isn't being changed. */
  336                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
  337                         /*
  338                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
  339                          * allow complete duplication of binding if
  340                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
  341                          * and a multicast address is bound on both
  342                          * new and duplicated sockets.
  343                          */
  344                         if (so->so_options & SO_REUSEADDR)
  345                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
  346                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
  347                         sin->sin_port = 0;              /* yech... */
  348                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  349                         /*
  350                          * Is the address a local IP address? 
  351                          * If INP_BINDANY is set, then the socket may be bound
  352                          * to any endpoint address, local or not.
  353                          */
  354                         if ((inp->inp_flags & INP_BINDANY) == 0 &&
  355                             ifa_ifwithaddr_check((struct sockaddr *)sin) == 0) 
  356                                 return (EADDRNOTAVAIL);
  357                 }
  358                 laddr = sin->sin_addr;
  359                 if (lport) {
  360                         struct inpcb *t;
  361                         struct tcptw *tw;
  362 
  363                         /* GROSS */
  364                         if (ntohs(lport) <= V_ipport_reservedhigh &&
  365                             ntohs(lport) >= V_ipport_reservedlow &&
  366                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
  367                             0))
  368                                 return (EACCES);
  369                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
  370                             priv_check_cred(inp->inp_cred,
  371                             PRIV_NETINET_REUSEPORT, 0) != 0) {
  372                                 t = in_pcblookup_local(pcbinfo, sin->sin_addr,
  373                                     lport, INPLOOKUP_WILDCARD, cred);
  374         /*
  375          * XXX
  376          * This entire block sorely needs a rewrite.
  377          */
  378                                 if (t &&
  379                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
  380                                     (so->so_type != SOCK_STREAM ||
  381                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
  382                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
  383                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
  384                                      (t->inp_socket->so_options &
  385                                          SO_REUSEPORT) == 0) &&
  386                                     (inp->inp_cred->cr_uid !=
  387                                      t->inp_cred->cr_uid))
  388                                         return (EADDRINUSE);
  389                         }
  390                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
  391                             lport, wild, cred);
  392                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
  393                                 /*
  394                                  * XXXRW: If an incpb has had its timewait
  395                                  * state recycled, we treat the address as
  396                                  * being in use (for now).  This is better
  397                                  * than a panic, but not desirable.
  398                                  */
  399                                 tw = intotw(inp);
  400                                 if (tw == NULL ||
  401                                     (reuseport & tw->tw_so_options) == 0)
  402                                         return (EADDRINUSE);
  403                         } else if (t &&
  404                             (reuseport & t->inp_socket->so_options) == 0) {
  405 #ifdef INET6
  406                                 if (ntohl(sin->sin_addr.s_addr) !=
  407                                     INADDR_ANY ||
  408                                     ntohl(t->inp_laddr.s_addr) !=
  409                                     INADDR_ANY ||
  410                                     INP_SOCKAF(so) ==
  411                                     INP_SOCKAF(t->inp_socket))
  412 #endif
  413                                 return (EADDRINUSE);
  414                         }
  415                 }
  416         }
  417         if (*lportp != 0)
  418                 lport = *lportp;
  419         if (lport == 0) {
  420                 u_short first, last, aux;
  421                 int count;
  422 
  423                 if (inp->inp_flags & INP_HIGHPORT) {
  424                         first = V_ipport_hifirstauto;   /* sysctl */
  425                         last  = V_ipport_hilastauto;
  426                         lastport = &pcbinfo->ipi_lasthi;
  427                 } else if (inp->inp_flags & INP_LOWPORT) {
  428                         error = priv_check_cred(cred,
  429                             PRIV_NETINET_RESERVEDPORT, 0);
  430                         if (error)
  431                                 return error;
  432                         first = V_ipport_lowfirstauto;  /* 1023 */
  433                         last  = V_ipport_lowlastauto;   /* 600 */
  434                         lastport = &pcbinfo->ipi_lastlow;
  435                 } else {
  436                         first = V_ipport_firstauto;     /* sysctl */
  437                         last  = V_ipport_lastauto;
  438                         lastport = &pcbinfo->ipi_lastport;
  439                 }
  440                 /*
  441                  * For UDP, use random port allocation as long as the user
  442                  * allows it.  For TCP (and as of yet unknown) connections,
  443                  * use random port allocation only if the user allows it AND
  444                  * ipport_tick() allows it.
  445                  */
  446                 if (V_ipport_randomized &&
  447                         (!V_ipport_stoprandom || pcbinfo == &V_udbinfo))
  448                         dorandom = 1;
  449                 else
  450                         dorandom = 0;
  451                 /*
  452                  * It makes no sense to do random port allocation if
  453                  * we have the only port available.
  454                  */
  455                 if (first == last)
  456                         dorandom = 0;
  457                 /* Make sure to not include UDP packets in the count. */
  458                 if (pcbinfo != &V_udbinfo)
  459                         V_ipport_tcpallocs++;
  460                 /*
  461                  * Instead of having two loops further down counting up or down
  462                  * make sure that first is always <= last and go with only one
  463                  * code path implementing all logic.
  464                  */
  465                 if (first > last) {
  466                         aux = first;
  467                         first = last;
  468                         last = aux;
  469                 }
  470 
  471                 if (dorandom)
  472                         *lastport = first +
  473                                     (arc4random() % (last - first));
  474 
  475                 count = last - first;
  476 
  477                 do {
  478                         if (count-- < 0)        /* completely used? */
  479                                 return (EADDRNOTAVAIL);
  480                         ++*lastport;
  481                         if (*lastport < first || *lastport > last)
  482                                 *lastport = first;
  483                         lport = htons(*lastport);
  484                 } while (in_pcblookup_local(pcbinfo, laddr,
  485                     lport, wild, cred));
  486         }
  487         *laddrp = laddr.s_addr;
  488         *lportp = lport;
  489         return (0);
  490 }
  491 
  492 /*
  493  * Connect from a socket to a specified address.
  494  * Both address and port must be specified in argument sin.
  495  * If don't have a local address for this socket yet,
  496  * then pick one.
  497  */
  498 int
  499 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
  500 {
  501         u_short lport, fport;
  502         in_addr_t laddr, faddr;
  503         int anonport, error;
  504 
  505         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  506         INP_WLOCK_ASSERT(inp);
  507 
  508         lport = inp->inp_lport;
  509         laddr = inp->inp_laddr.s_addr;
  510         anonport = (lport == 0);
  511         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
  512             NULL, cred);
  513         if (error)
  514                 return (error);
  515 
  516         /* Do the initial binding of the local address if required. */
  517         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
  518                 inp->inp_lport = lport;
  519                 inp->inp_laddr.s_addr = laddr;
  520                 if (in_pcbinshash(inp) != 0) {
  521                         inp->inp_laddr.s_addr = INADDR_ANY;
  522                         inp->inp_lport = 0;
  523                         return (EAGAIN);
  524                 }
  525         }
  526 
  527         /* Commit the remaining changes. */
  528         inp->inp_lport = lport;
  529         inp->inp_laddr.s_addr = laddr;
  530         inp->inp_faddr.s_addr = faddr;
  531         inp->inp_fport = fport;
  532         in_pcbrehash(inp);
  533 
  534         if (anonport)
  535                 inp->inp_flags |= INP_ANONPORT;
  536         return (0);
  537 }
  538 
  539 /*
  540  * Do proper source address selection on an unbound socket in case
  541  * of connect. Take jails into account as well.
  542  */
  543 static int
  544 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
  545     struct ucred *cred)
  546 {
  547         struct ifaddr *ifa;
  548         struct sockaddr *sa;
  549         struct sockaddr_in *sin;
  550         struct route sro;
  551         int error;
  552 
  553         KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
  554 
  555         error = 0;
  556         bzero(&sro, sizeof(sro));
  557 
  558         sin = (struct sockaddr_in *)&sro.ro_dst;
  559         sin->sin_family = AF_INET;
  560         sin->sin_len = sizeof(struct sockaddr_in);
  561         sin->sin_addr.s_addr = faddr->s_addr;
  562 
  563         /*
  564          * If route is known our src addr is taken from the i/f,
  565          * else punt.
  566          *
  567          * Find out route to destination.
  568          */
  569         if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
  570                 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
  571 
  572         /*
  573          * If we found a route, use the address corresponding to
  574          * the outgoing interface.
  575          * 
  576          * Otherwise assume faddr is reachable on a directly connected
  577          * network and try to find a corresponding interface to take
  578          * the source address from.
  579          */
  580         if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
  581                 struct in_ifaddr *ia;
  582                 struct ifnet *ifp;
  583 
  584                 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin));
  585                 if (ia == NULL)
  586                         ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin));
  587                 if (ia == NULL) {
  588                         error = ENETUNREACH;
  589                         goto done;
  590                 }
  591 
  592                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
  593                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  594                         ifa_free(&ia->ia_ifa);
  595                         goto done;
  596                 }
  597 
  598                 ifp = ia->ia_ifp;
  599                 ifa_free(&ia->ia_ifa);
  600                 ia = NULL;
  601                 IF_ADDR_LOCK(ifp);
  602                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  603 
  604                         sa = ifa->ifa_addr;
  605                         if (sa->sa_family != AF_INET)
  606                                 continue;
  607                         sin = (struct sockaddr_in *)sa;
  608                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
  609                                 ia = (struct in_ifaddr *)ifa;
  610                                 break;
  611                         }
  612                 }
  613                 if (ia != NULL) {
  614                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  615                         IF_ADDR_UNLOCK(ifp);
  616                         goto done;
  617                 }
  618                 IF_ADDR_UNLOCK(ifp);
  619 
  620                 /* 3. As a last resort return the 'default' jail address. */
  621                 error = prison_get_ip4(cred, laddr);
  622                 goto done;
  623         }
  624 
  625         /*
  626          * If the outgoing interface on the route found is not
  627          * a loopback interface, use the address from that interface.
  628          * In case of jails do those three steps:
  629          * 1. check if the interface address belongs to the jail. If so use it.
  630          * 2. check if we have any address on the outgoing interface
  631          *    belonging to this jail. If so use it.
  632          * 3. as a last resort return the 'default' jail address.
  633          */
  634         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
  635                 struct in_ifaddr *ia;
  636                 struct ifnet *ifp;
  637 
  638                 /* If not jailed, use the default returned. */
  639                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
  640                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
  641                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  642                         goto done;
  643                 }
  644 
  645                 /* Jailed. */
  646                 /* 1. Check if the iface address belongs to the jail. */
  647                 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
  648                 if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
  649                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
  650                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  651                         goto done;
  652                 }
  653 
  654                 /*
  655                  * 2. Check if we have any address on the outgoing interface
  656                  *    belonging to this jail.
  657                  */
  658                 ia = NULL;
  659                 ifp = sro.ro_rt->rt_ifp;
  660                 IF_ADDR_LOCK(ifp);
  661                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  662                         sa = ifa->ifa_addr;
  663                         if (sa->sa_family != AF_INET)
  664                                 continue;
  665                         sin = (struct sockaddr_in *)sa;
  666                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
  667                                 ia = (struct in_ifaddr *)ifa;
  668                                 break;
  669                         }
  670                 }
  671                 if (ia != NULL) {
  672                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  673                         IF_ADDR_UNLOCK(ifp);
  674                         goto done;
  675                 }
  676                 IF_ADDR_UNLOCK(ifp);
  677 
  678                 /* 3. As a last resort return the 'default' jail address. */
  679                 error = prison_get_ip4(cred, laddr);
  680                 goto done;
  681         }
  682 
  683         /*
  684          * The outgoing interface is marked with 'loopback net', so a route
  685          * to ourselves is here.
  686          * Try to find the interface of the destination address and then
  687          * take the address from there. That interface is not necessarily
  688          * a loopback interface.
  689          * In case of jails, check that it is an address of the jail
  690          * and if we cannot find, fall back to the 'default' jail address.
  691          */
  692         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
  693                 struct sockaddr_in sain;
  694                 struct in_ifaddr *ia;
  695 
  696                 bzero(&sain, sizeof(struct sockaddr_in));
  697                 sain.sin_family = AF_INET;
  698                 sain.sin_len = sizeof(struct sockaddr_in);
  699                 sain.sin_addr.s_addr = faddr->s_addr;
  700 
  701                 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain)));
  702                 if (ia == NULL)
  703                         ia = ifatoia(ifa_ifwithnet(sintosa(&sain)));
  704                 if (ia == NULL)
  705                         ia = ifatoia(ifa_ifwithaddr(sintosa(&sain)));
  706 
  707                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
  708                         if (ia == NULL) {
  709                                 error = ENETUNREACH;
  710                                 goto done;
  711                         }
  712                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  713                         ifa_free(&ia->ia_ifa);
  714                         goto done;
  715                 }
  716 
  717                 /* Jailed. */
  718                 if (ia != NULL) {
  719                         struct ifnet *ifp;
  720 
  721                         ifp = ia->ia_ifp;
  722                         ifa_free(&ia->ia_ifa);
  723                         ia = NULL;
  724                         IF_ADDR_LOCK(ifp);
  725                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  726 
  727                                 sa = ifa->ifa_addr;
  728                                 if (sa->sa_family != AF_INET)
  729                                         continue;
  730                                 sin = (struct sockaddr_in *)sa;
  731                                 if (prison_check_ip4(cred,
  732                                     &sin->sin_addr) == 0) {
  733                                         ia = (struct in_ifaddr *)ifa;
  734                                         break;
  735                                 }
  736                         }
  737                         if (ia != NULL) {
  738                                 laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  739                                 IF_ADDR_UNLOCK(ifp);
  740                                 goto done;
  741                         }
  742                         IF_ADDR_UNLOCK(ifp);
  743                 }
  744 
  745                 /* 3. As a last resort return the 'default' jail address. */
  746                 error = prison_get_ip4(cred, laddr);
  747                 goto done;
  748         }
  749 
  750 done:
  751         if (sro.ro_rt != NULL)
  752                 RTFREE(sro.ro_rt);
  753         return (error);
  754 }
  755 
  756 /*
  757  * Set up for a connect from a socket to the specified address.
  758  * On entry, *laddrp and *lportp should contain the current local
  759  * address and port for the PCB; these are updated to the values
  760  * that should be placed in inp_laddr and inp_lport to complete
  761  * the connect.
  762  *
  763  * On success, *faddrp and *fportp will be set to the remote address
  764  * and port. These are not updated in the error case.
  765  *
  766  * If the operation fails because the connection already exists,
  767  * *oinpp will be set to the PCB of that connection so that the
  768  * caller can decide to override it. In all other cases, *oinpp
  769  * is set to NULL.
  770  */
  771 int
  772 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
  773     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
  774     struct inpcb **oinpp, struct ucred *cred)
  775 {
  776         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
  777         struct in_ifaddr *ia;
  778         struct inpcb *oinp;
  779         struct in_addr laddr, faddr;
  780         u_short lport, fport;
  781         int error;
  782 
  783         /*
  784          * Because a global state change doesn't actually occur here, a read
  785          * lock is sufficient.
  786          */
  787         INP_INFO_LOCK_ASSERT(inp->inp_pcbinfo);
  788         INP_LOCK_ASSERT(inp);
  789 
  790         if (oinpp != NULL)
  791                 *oinpp = NULL;
  792         if (nam->sa_len != sizeof (*sin))
  793                 return (EINVAL);
  794         if (sin->sin_family != AF_INET)
  795                 return (EAFNOSUPPORT);
  796         if (sin->sin_port == 0)
  797                 return (EADDRNOTAVAIL);
  798         laddr.s_addr = *laddrp;
  799         lport = *lportp;
  800         faddr = sin->sin_addr;
  801         fport = sin->sin_port;
  802 
  803         if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
  804                 /*
  805                  * If the destination address is INADDR_ANY,
  806                  * use the primary local address.
  807                  * If the supplied address is INADDR_BROADCAST,
  808                  * and the primary interface supports broadcast,
  809                  * choose the broadcast address for that interface.
  810                  */
  811                 if (faddr.s_addr == INADDR_ANY) {
  812                         IN_IFADDR_RLOCK();
  813                         faddr =
  814                             IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
  815                         IN_IFADDR_RUNLOCK();
  816                         if (cred != NULL &&
  817                             (error = prison_get_ip4(cred, &faddr)) != 0)
  818                                 return (error);
  819                 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
  820                         IN_IFADDR_RLOCK();
  821                         if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
  822                             IFF_BROADCAST)
  823                                 faddr = satosin(&TAILQ_FIRST(
  824                                     &V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
  825                         IN_IFADDR_RUNLOCK();
  826                 }
  827         }
  828         if (laddr.s_addr == INADDR_ANY) {
  829                 error = in_pcbladdr(inp, &faddr, &laddr, cred);
  830                 if (error)
  831                         return (error);
  832 
  833                 /*
  834                  * If the destination address is multicast and an outgoing
  835                  * interface has been set as a multicast option, use the
  836                  * address of that interface as our source address.
  837                  */
  838                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
  839                     inp->inp_moptions != NULL) {
  840                         struct ip_moptions *imo;
  841                         struct ifnet *ifp;
  842 
  843                         imo = inp->inp_moptions;
  844                         if (imo->imo_multicast_ifp != NULL) {
  845                                 ifp = imo->imo_multicast_ifp;
  846                                 IN_IFADDR_RLOCK();
  847                                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link)
  848                                         if (ia->ia_ifp == ifp)
  849                                                 break;
  850                                 if (ia == NULL) {
  851                                         IN_IFADDR_RUNLOCK();
  852                                         return (EADDRNOTAVAIL);
  853                                 }
  854                                 laddr = ia->ia_addr.sin_addr;
  855                                 IN_IFADDR_RUNLOCK();
  856                         }
  857                 }
  858         }
  859 
  860         oinp = in_pcblookup_hash(inp->inp_pcbinfo, faddr, fport, laddr, lport,
  861             0, NULL);
  862         if (oinp != NULL) {
  863                 if (oinpp != NULL)
  864                         *oinpp = oinp;
  865                 return (EADDRINUSE);
  866         }
  867         if (lport == 0) {
  868                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
  869                     cred);
  870                 if (error)
  871                         return (error);
  872         }
  873         *laddrp = laddr.s_addr;
  874         *lportp = lport;
  875         *faddrp = faddr.s_addr;
  876         *fportp = fport;
  877         return (0);
  878 }
  879 
  880 void
  881 in_pcbdisconnect(struct inpcb *inp)
  882 {
  883 
  884         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  885         INP_WLOCK_ASSERT(inp);
  886 
  887         inp->inp_faddr.s_addr = INADDR_ANY;
  888         inp->inp_fport = 0;
  889         in_pcbrehash(inp);
  890 }
  891 
  892 /*
  893  * in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
  894  * For most protocols, this will be invoked immediately prior to calling
  895  * in_pcbfree().  However, with TCP the inpcb may significantly outlive the
  896  * socket, in which case in_pcbfree() is deferred.
  897  */
  898 void
  899 in_pcbdetach(struct inpcb *inp)
  900 {
  901 
  902         KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
  903 
  904         inp->inp_socket->so_pcb = NULL;
  905         inp->inp_socket = NULL;
  906 }
  907 
  908 /*
  909  * in_pcbfree_internal() frees an inpcb that has been detached from its
  910  * socket, and whose reference count has reached 0.  It will also remove the
  911  * inpcb from any global lists it might remain on.
  912  */
  913 static void
  914 in_pcbfree_internal(struct inpcb *inp)
  915 {
  916         struct inpcbinfo *ipi = inp->inp_pcbinfo;
  917 
  918         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
  919         KASSERT(inp->inp_refcount == 0, ("%s: refcount !0", __func__));
  920 
  921         INP_INFO_WLOCK_ASSERT(ipi);
  922         INP_WLOCK_ASSERT(inp);
  923 
  924 #ifdef IPSEC
  925         if (inp->inp_sp != NULL)
  926                 ipsec_delete_pcbpolicy(inp);
  927 #endif /* IPSEC */
  928         inp->inp_gencnt = ++ipi->ipi_gencnt;
  929         in_pcbremlists(inp);
  930 #ifdef INET6
  931         if (inp->inp_vflag & INP_IPV6PROTO) {
  932                 ip6_freepcbopts(inp->in6p_outputopts);
  933                 if (inp->in6p_moptions != NULL)
  934                         ip6_freemoptions(inp->in6p_moptions);
  935         }
  936 #endif
  937         if (inp->inp_options)
  938                 (void)m_free(inp->inp_options);
  939         if (inp->inp_moptions != NULL)
  940                 inp_freemoptions(inp->inp_moptions);
  941         inp->inp_vflag = 0;
  942         crfree(inp->inp_cred);
  943 
  944 #ifdef MAC
  945         mac_inpcb_destroy(inp);
  946 #endif
  947         INP_WUNLOCK(inp);
  948         uma_zfree(ipi->ipi_zone, inp);
  949 }
  950 
  951 /*
  952  * in_pcbref() bumps the reference count on an inpcb in order to maintain
  953  * stability of an inpcb pointer despite the inpcb lock being released.  This
  954  * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
  955  * but where the inpcb lock is already held.
  956  *
  957  * While the inpcb will not be freed, releasing the inpcb lock means that the
  958  * connection's state may change, so the caller should be careful to
  959  * revalidate any cached state on reacquiring the lock.  Drop the reference
  960  * using in_pcbrele().
  961  */
  962 void
  963 in_pcbref(struct inpcb *inp)
  964 {
  965 
  966         INP_WLOCK_ASSERT(inp);
  967 
  968         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
  969 
  970         inp->inp_refcount++;
  971 }
  972 
  973 /*
  974  * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
  975  * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
  976  * return a flag indicating whether or not the inpcb remains valid.  If it is
  977  * valid, we return with the inpcb lock held.
  978  */
  979 int
  980 in_pcbrele(struct inpcb *inp)
  981 {
  982 #ifdef INVARIANTS
  983         struct inpcbinfo *ipi = inp->inp_pcbinfo;
  984 #endif
  985 
  986         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
  987 
  988         INP_INFO_WLOCK_ASSERT(ipi);
  989         INP_WLOCK_ASSERT(inp);
  990 
  991         inp->inp_refcount--;
  992         if (inp->inp_refcount > 0)
  993                 return (0);
  994         in_pcbfree_internal(inp);
  995         return (1);
  996 }
  997 
  998 /*
  999  * Unconditionally schedule an inpcb to be freed by decrementing its
 1000  * reference count, which should occur only after the inpcb has been detached
 1001  * from its socket.  If another thread holds a temporary reference (acquired
 1002  * using in_pcbref()) then the free is deferred until that reference is
 1003  * released using in_pcbrele(), but the inpcb is still unlocked.
 1004  */
 1005 void
 1006 in_pcbfree(struct inpcb *inp)
 1007 {
 1008 #ifdef INVARIANTS
 1009         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 1010 #endif
 1011 
 1012         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL",
 1013             __func__));
 1014 
 1015         INP_INFO_WLOCK_ASSERT(ipi);
 1016         INP_WLOCK_ASSERT(inp);
 1017 
 1018         if (!in_pcbrele(inp))
 1019                 INP_WUNLOCK(inp);
 1020 }
 1021 
 1022 /*
 1023  * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
 1024  * port reservation, and preventing it from being returned by inpcb lookups.
 1025  *
 1026  * It is used by TCP to mark an inpcb as unused and avoid future packet
 1027  * delivery or event notification when a socket remains open but TCP has
 1028  * closed.  This might occur as a result of a shutdown()-initiated TCP close
 1029  * or a RST on the wire, and allows the port binding to be reused while still
 1030  * maintaining the invariant that so_pcb always points to a valid inpcb until
 1031  * in_pcbdetach().
 1032  *
 1033  * XXXRW: An inp_lport of 0 is used to indicate that the inpcb is not on hash
 1034  * lists, but can lead to confusing netstat output, as open sockets with
 1035  * closed TCP connections will no longer appear to have their bound port
 1036  * number.  An explicit flag would be better, as it would allow us to leave
 1037  * the port number intact after the connection is dropped.
 1038  *
 1039  * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
 1040  * in_pcbnotifyall() and in_pcbpurgeif0()?
 1041  */
 1042 void
 1043 in_pcbdrop(struct inpcb *inp)
 1044 {
 1045 
 1046         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 1047         INP_WLOCK_ASSERT(inp);
 1048 
 1049         inp->inp_flags |= INP_DROPPED;
 1050         if (inp->inp_flags & INP_INHASHLIST) {
 1051                 struct inpcbport *phd = inp->inp_phd;
 1052 
 1053                 LIST_REMOVE(inp, inp_hash);
 1054                 LIST_REMOVE(inp, inp_portlist);
 1055                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 1056                         LIST_REMOVE(phd, phd_hash);
 1057                         free(phd, M_PCB);
 1058                 }
 1059                 inp->inp_flags &= ~INP_INHASHLIST;
 1060         }
 1061 }
 1062 
 1063 /*
 1064  * Common routines to return the socket addresses associated with inpcbs.
 1065  */
 1066 struct sockaddr *
 1067 in_sockaddr(in_port_t port, struct in_addr *addr_p)
 1068 {
 1069         struct sockaddr_in *sin;
 1070 
 1071         sin = malloc(sizeof *sin, M_SONAME,
 1072                 M_WAITOK | M_ZERO);
 1073         sin->sin_family = AF_INET;
 1074         sin->sin_len = sizeof(*sin);
 1075         sin->sin_addr = *addr_p;
 1076         sin->sin_port = port;
 1077 
 1078         return (struct sockaddr *)sin;
 1079 }
 1080 
 1081 int
 1082 in_getsockaddr(struct socket *so, struct sockaddr **nam)
 1083 {
 1084         struct inpcb *inp;
 1085         struct in_addr addr;
 1086         in_port_t port;
 1087 
 1088         inp = sotoinpcb(so);
 1089         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
 1090 
 1091         INP_RLOCK(inp);
 1092         port = inp->inp_lport;
 1093         addr = inp->inp_laddr;
 1094         INP_RUNLOCK(inp);
 1095 
 1096         *nam = in_sockaddr(port, &addr);
 1097         return 0;
 1098 }
 1099 
 1100 int
 1101 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
 1102 {
 1103         struct inpcb *inp;
 1104         struct in_addr addr;
 1105         in_port_t port;
 1106 
 1107         inp = sotoinpcb(so);
 1108         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
 1109 
 1110         INP_RLOCK(inp);
 1111         port = inp->inp_fport;
 1112         addr = inp->inp_faddr;
 1113         INP_RUNLOCK(inp);
 1114 
 1115         *nam = in_sockaddr(port, &addr);
 1116         return 0;
 1117 }
 1118 
 1119 void
 1120 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
 1121     struct inpcb *(*notify)(struct inpcb *, int))
 1122 {
 1123         struct inpcb *inp, *inp_temp;
 1124 
 1125         INP_INFO_WLOCK(pcbinfo);
 1126         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
 1127                 INP_WLOCK(inp);
 1128 #ifdef INET6
 1129                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 1130                         INP_WUNLOCK(inp);
 1131                         continue;
 1132                 }
 1133 #endif
 1134                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 1135                     inp->inp_socket == NULL) {
 1136                         INP_WUNLOCK(inp);
 1137                         continue;
 1138                 }
 1139                 if ((*notify)(inp, errno))
 1140                         INP_WUNLOCK(inp);
 1141         }
 1142         INP_INFO_WUNLOCK(pcbinfo);
 1143 }
 1144 
 1145 void
 1146 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 1147 {
 1148         struct inpcb *inp;
 1149         struct ip_moptions *imo;
 1150         int i, gap;
 1151 
 1152         INP_INFO_RLOCK(pcbinfo);
 1153         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
 1154                 INP_WLOCK(inp);
 1155                 imo = inp->inp_moptions;
 1156                 if ((inp->inp_vflag & INP_IPV4) &&
 1157                     imo != NULL) {
 1158                         /*
 1159                          * Unselect the outgoing interface if it is being
 1160                          * detached.
 1161                          */
 1162                         if (imo->imo_multicast_ifp == ifp)
 1163                                 imo->imo_multicast_ifp = NULL;
 1164 
 1165                         /*
 1166                          * Drop multicast group membership if we joined
 1167                          * through the interface being detached.
 1168                          */
 1169                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 1170                             i++) {
 1171                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 1172                                         in_delmulti(imo->imo_membership[i]);
 1173                                         gap++;
 1174                                 } else if (gap != 0)
 1175                                         imo->imo_membership[i - gap] =
 1176                                             imo->imo_membership[i];
 1177                         }
 1178                         imo->imo_num_memberships -= gap;
 1179                 }
 1180                 INP_WUNLOCK(inp);
 1181         }
 1182         INP_INFO_RUNLOCK(pcbinfo);
 1183 }
 1184 
 1185 /*
 1186  * Lookup a PCB based on the local address and port.
 1187  */
 1188 #define INP_LOOKUP_MAPPED_PCB_COST      3
 1189 struct inpcb *
 1190 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 1191     u_short lport, int wild_okay, struct ucred *cred)
 1192 {
 1193         struct inpcb *inp;
 1194 #ifdef INET6
 1195         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
 1196 #else
 1197         int matchwild = 3;
 1198 #endif
 1199         int wildcard;
 1200 
 1201         INP_INFO_LOCK_ASSERT(pcbinfo);
 1202 
 1203         if (!wild_okay) {
 1204                 struct inpcbhead *head;
 1205                 /*
 1206                  * Look for an unconnected (wildcard foreign addr) PCB that
 1207                  * matches the local address and port we're looking for.
 1208                  */
 1209                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 1210                     0, pcbinfo->ipi_hashmask)];
 1211                 LIST_FOREACH(inp, head, inp_hash) {
 1212 #ifdef INET6
 1213                         /* XXX inp locking */
 1214                         if ((inp->inp_vflag & INP_IPV4) == 0)
 1215                                 continue;
 1216 #endif
 1217                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 1218                             inp->inp_laddr.s_addr == laddr.s_addr &&
 1219                             inp->inp_lport == lport) {
 1220                                 /*
 1221                                  * Found?
 1222                                  */
 1223                                 if (cred == NULL ||
 1224                                     prison_equal_ip4(cred->cr_prison,
 1225                                         inp->inp_cred->cr_prison))
 1226                                         return (inp);
 1227                         }
 1228                 }
 1229                 /*
 1230                  * Not found.
 1231                  */
 1232                 return (NULL);
 1233         } else {
 1234                 struct inpcbporthead *porthash;
 1235                 struct inpcbport *phd;
 1236                 struct inpcb *match = NULL;
 1237                 /*
 1238                  * Best fit PCB lookup.
 1239                  *
 1240                  * First see if this local port is in use by looking on the
 1241                  * port hash list.
 1242                  */
 1243                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 1244                     pcbinfo->ipi_porthashmask)];
 1245                 LIST_FOREACH(phd, porthash, phd_hash) {
 1246                         if (phd->phd_port == lport)
 1247                                 break;
 1248                 }
 1249                 if (phd != NULL) {
 1250                         /*
 1251                          * Port is in use by one or more PCBs. Look for best
 1252                          * fit.
 1253                          */
 1254                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 1255                                 wildcard = 0;
 1256                                 if (cred != NULL &&
 1257                                     !prison_equal_ip4(inp->inp_cred->cr_prison,
 1258                                         cred->cr_prison))
 1259                                         continue;
 1260 #ifdef INET6
 1261                                 /* XXX inp locking */
 1262                                 if ((inp->inp_vflag & INP_IPV4) == 0)
 1263                                         continue;
 1264                                 /*
 1265                                  * We never select the PCB that has
 1266                                  * INP_IPV6 flag and is bound to :: if
 1267                                  * we have another PCB which is bound
 1268                                  * to 0.0.0.0.  If a PCB has the
 1269                                  * INP_IPV6 flag, then we set its cost
 1270                                  * higher than IPv4 only PCBs.
 1271                                  *
 1272                                  * Note that the case only happens
 1273                                  * when a socket is bound to ::, under
 1274                                  * the condition that the use of the
 1275                                  * mapped address is allowed.
 1276                                  */
 1277                                 if ((inp->inp_vflag & INP_IPV6) != 0)
 1278                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
 1279 #endif
 1280                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
 1281                                         wildcard++;
 1282                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
 1283                                         if (laddr.s_addr == INADDR_ANY)
 1284                                                 wildcard++;
 1285                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
 1286                                                 continue;
 1287                                 } else {
 1288                                         if (laddr.s_addr != INADDR_ANY)
 1289                                                 wildcard++;
 1290                                 }
 1291                                 if (wildcard < matchwild) {
 1292                                         match = inp;
 1293                                         matchwild = wildcard;
 1294                                         if (matchwild == 0)
 1295                                                 break;
 1296                                 }
 1297                         }
 1298                 }
 1299                 return (match);
 1300         }
 1301 }
 1302 #undef INP_LOOKUP_MAPPED_PCB_COST
 1303 
 1304 /*
 1305  * Lookup PCB in hash list.
 1306  */
 1307 struct inpcb *
 1308 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
 1309     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int wildcard,
 1310     struct ifnet *ifp)
 1311 {
 1312         struct inpcbhead *head;
 1313         struct inpcb *inp, *tmpinp;
 1314         u_short fport = fport_arg, lport = lport_arg;
 1315 
 1316         INP_INFO_LOCK_ASSERT(pcbinfo);
 1317 
 1318         /*
 1319          * First look for an exact match.
 1320          */
 1321         tmpinp = NULL;
 1322         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
 1323             pcbinfo->ipi_hashmask)];
 1324         LIST_FOREACH(inp, head, inp_hash) {
 1325 #ifdef INET6
 1326                 /* XXX inp locking */
 1327                 if ((inp->inp_vflag & INP_IPV4) == 0)
 1328                         continue;
 1329 #endif
 1330                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
 1331                     inp->inp_laddr.s_addr == laddr.s_addr &&
 1332                     inp->inp_fport == fport &&
 1333                     inp->inp_lport == lport) {
 1334                         /*
 1335                          * XXX We should be able to directly return
 1336                          * the inp here, without any checks.
 1337                          * Well unless both bound with SO_REUSEPORT?
 1338                          */
 1339                         if (prison_flag(inp->inp_cred, PR_IP4))
 1340                                 return (inp);
 1341                         if (tmpinp == NULL)
 1342                                 tmpinp = inp;
 1343                 }
 1344         }
 1345         if (tmpinp != NULL)
 1346                 return (tmpinp);
 1347 
 1348         /*
 1349          * Then look for a wildcard match, if requested.
 1350          */
 1351         if (wildcard == INPLOOKUP_WILDCARD) {
 1352                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 1353 #ifdef INET6
 1354                 struct inpcb *local_wild_mapped = NULL;
 1355 #endif
 1356                 struct inpcb *jail_wild = NULL;
 1357                 int injail;
 1358 
 1359                 /*
 1360                  * Order of socket selection - we always prefer jails.
 1361                  *      1. jailed, non-wild.
 1362                  *      2. jailed, wild.
 1363                  *      3. non-jailed, non-wild.
 1364                  *      4. non-jailed, wild.
 1365                  */
 1366 
 1367                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 1368                     0, pcbinfo->ipi_hashmask)];
 1369                 LIST_FOREACH(inp, head, inp_hash) {
 1370 #ifdef INET6
 1371                         /* XXX inp locking */
 1372                         if ((inp->inp_vflag & INP_IPV4) == 0)
 1373                                 continue;
 1374 #endif
 1375                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
 1376                             inp->inp_lport != lport)
 1377                                 continue;
 1378 
 1379                         /* XXX inp locking */
 1380                         if (ifp && ifp->if_type == IFT_FAITH &&
 1381                             (inp->inp_flags & INP_FAITH) == 0)
 1382                                 continue;
 1383 
 1384                         injail = prison_flag(inp->inp_cred, PR_IP4);
 1385                         if (injail) {
 1386                                 if (prison_check_ip4(inp->inp_cred,
 1387                                     &laddr) != 0)
 1388                                         continue;
 1389                         } else {
 1390                                 if (local_exact != NULL)
 1391                                         continue;
 1392                         }
 1393 
 1394                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
 1395                                 if (injail)
 1396                                         return (inp);
 1397                                 else
 1398                                         local_exact = inp;
 1399                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
 1400 #ifdef INET6
 1401                                 /* XXX inp locking, NULL check */
 1402                                 if (inp->inp_vflag & INP_IPV6PROTO)
 1403                                         local_wild_mapped = inp;
 1404                                 else
 1405 #endif /* INET6 */
 1406                                         if (injail)
 1407                                                 jail_wild = inp;
 1408                                         else
 1409                                                 local_wild = inp;
 1410                         }
 1411                 } /* LIST_FOREACH */
 1412                 if (jail_wild != NULL)
 1413                         return (jail_wild);
 1414                 if (local_exact != NULL)
 1415                         return (local_exact);
 1416                 if (local_wild != NULL)
 1417                         return (local_wild);
 1418 #ifdef INET6
 1419                 if (local_wild_mapped != NULL)
 1420                         return (local_wild_mapped);
 1421 #endif /* defined(INET6) */
 1422         } /* if (wildcard == INPLOOKUP_WILDCARD) */
 1423 
 1424         return (NULL);
 1425 }
 1426 
 1427 /*
 1428  * Insert PCB onto various hash lists.
 1429  */
 1430 int
 1431 in_pcbinshash(struct inpcb *inp)
 1432 {
 1433         struct inpcbhead *pcbhash;
 1434         struct inpcbporthead *pcbporthash;
 1435         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 1436         struct inpcbport *phd;
 1437         u_int32_t hashkey_faddr;
 1438 
 1439         INP_INFO_WLOCK_ASSERT(pcbinfo);
 1440         INP_WLOCK_ASSERT(inp);
 1441         KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
 1442             ("in_pcbinshash: INP_INHASHLIST"));
 1443 
 1444 #ifdef INET6
 1445         if (inp->inp_vflag & INP_IPV6)
 1446                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
 1447         else
 1448 #endif /* INET6 */
 1449         hashkey_faddr = inp->inp_faddr.s_addr;
 1450 
 1451         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
 1452                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
 1453 
 1454         pcbporthash = &pcbinfo->ipi_porthashbase[
 1455             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
 1456 
 1457         /*
 1458          * Go through port list and look for a head for this lport.
 1459          */
 1460         LIST_FOREACH(phd, pcbporthash, phd_hash) {
 1461                 if (phd->phd_port == inp->inp_lport)
 1462                         break;
 1463         }
 1464         /*
 1465          * If none exists, malloc one and tack it on.
 1466          */
 1467         if (phd == NULL) {
 1468                 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
 1469                 if (phd == NULL) {
 1470                         return (ENOBUFS); /* XXX */
 1471                 }
 1472                 phd->phd_port = inp->inp_lport;
 1473                 LIST_INIT(&phd->phd_pcblist);
 1474                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
 1475         }
 1476         inp->inp_phd = phd;
 1477         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
 1478         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
 1479         inp->inp_flags |= INP_INHASHLIST;
 1480         return (0);
 1481 }
 1482 
 1483 /*
 1484  * Move PCB to the proper hash bucket when { faddr, fport } have  been
 1485  * changed. NOTE: This does not handle the case of the lport changing (the
 1486  * hashed port list would have to be updated as well), so the lport must
 1487  * not change after in_pcbinshash() has been called.
 1488  */
 1489 void
 1490 in_pcbrehash(struct inpcb *inp)
 1491 {
 1492         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 1493         struct inpcbhead *head;
 1494         u_int32_t hashkey_faddr;
 1495 
 1496         INP_INFO_WLOCK_ASSERT(pcbinfo);
 1497         INP_WLOCK_ASSERT(inp);
 1498         KASSERT(inp->inp_flags & INP_INHASHLIST,
 1499             ("in_pcbrehash: !INP_INHASHLIST"));
 1500 
 1501 #ifdef INET6
 1502         if (inp->inp_vflag & INP_IPV6)
 1503                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
 1504         else
 1505 #endif /* INET6 */
 1506         hashkey_faddr = inp->inp_faddr.s_addr;
 1507 
 1508         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
 1509                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
 1510 
 1511         LIST_REMOVE(inp, inp_hash);
 1512         LIST_INSERT_HEAD(head, inp, inp_hash);
 1513 }
 1514 
 1515 /*
 1516  * Remove PCB from various lists.
 1517  */
 1518 static void
 1519 in_pcbremlists(struct inpcb *inp)
 1520 {
 1521         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 1522 
 1523         INP_INFO_WLOCK_ASSERT(pcbinfo);
 1524         INP_WLOCK_ASSERT(inp);
 1525 
 1526         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 1527         if (inp->inp_flags & INP_INHASHLIST) {
 1528                 struct inpcbport *phd = inp->inp_phd;
 1529 
 1530                 LIST_REMOVE(inp, inp_hash);
 1531                 LIST_REMOVE(inp, inp_portlist);
 1532                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 1533                         LIST_REMOVE(phd, phd_hash);
 1534                         free(phd, M_PCB);
 1535                 }
 1536                 inp->inp_flags &= ~INP_INHASHLIST;
 1537         }
 1538         LIST_REMOVE(inp, inp_list);
 1539         pcbinfo->ipi_count--;
 1540 }
 1541 
 1542 /*
 1543  * A set label operation has occurred at the socket layer, propagate the
 1544  * label change into the in_pcb for the socket.
 1545  */
 1546 void
 1547 in_pcbsosetlabel(struct socket *so)
 1548 {
 1549 #ifdef MAC
 1550         struct inpcb *inp;
 1551 
 1552         inp = sotoinpcb(so);
 1553         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
 1554 
 1555         INP_WLOCK(inp);
 1556         SOCK_LOCK(so);
 1557         mac_inpcb_sosetlabel(so, inp);
 1558         SOCK_UNLOCK(so);
 1559         INP_WUNLOCK(inp);
 1560 #endif
 1561 }
 1562 
 1563 /*
 1564  * ipport_tick runs once per second, determining if random port allocation
 1565  * should be continued.  If more than ipport_randomcps ports have been
 1566  * allocated in the last second, then we return to sequential port
 1567  * allocation. We return to random allocation only once we drop below
 1568  * ipport_randomcps for at least ipport_randomtime seconds.
 1569  */
 1570 void
 1571 ipport_tick(void *xtp)
 1572 {
 1573         VNET_ITERATOR_DECL(vnet_iter);
 1574 
 1575         VNET_LIST_RLOCK_NOSLEEP();
 1576         VNET_FOREACH(vnet_iter) {
 1577                 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
 1578                 if (V_ipport_tcpallocs <=
 1579                     V_ipport_tcplastcount + V_ipport_randomcps) {
 1580                         if (V_ipport_stoprandom > 0)
 1581                                 V_ipport_stoprandom--;
 1582                 } else
 1583                         V_ipport_stoprandom = V_ipport_randomtime;
 1584                 V_ipport_tcplastcount = V_ipport_tcpallocs;
 1585                 CURVNET_RESTORE();
 1586         }
 1587         VNET_LIST_RUNLOCK_NOSLEEP();
 1588         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
 1589 }
 1590 
 1591 void
 1592 inp_wlock(struct inpcb *inp)
 1593 {
 1594 
 1595         INP_WLOCK(inp);
 1596 }
 1597 
 1598 void
 1599 inp_wunlock(struct inpcb *inp)
 1600 {
 1601 
 1602         INP_WUNLOCK(inp);
 1603 }
 1604 
 1605 void
 1606 inp_rlock(struct inpcb *inp)
 1607 {
 1608 
 1609         INP_RLOCK(inp);
 1610 }
 1611 
 1612 void
 1613 inp_runlock(struct inpcb *inp)
 1614 {
 1615 
 1616         INP_RUNLOCK(inp);
 1617 }
 1618 
 1619 #ifdef INVARIANTS
 1620 void
 1621 inp_lock_assert(struct inpcb *inp)
 1622 {
 1623 
 1624         INP_WLOCK_ASSERT(inp);
 1625 }
 1626 
 1627 void
 1628 inp_unlock_assert(struct inpcb *inp)
 1629 {
 1630 
 1631         INP_UNLOCK_ASSERT(inp);
 1632 }
 1633 #endif
 1634 
 1635 void
 1636 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
 1637 {
 1638         struct inpcb *inp;
 1639 
 1640         INP_INFO_RLOCK(&V_tcbinfo);
 1641         LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
 1642                 INP_WLOCK(inp);
 1643                 func(inp, arg);
 1644                 INP_WUNLOCK(inp);
 1645         }
 1646         INP_INFO_RUNLOCK(&V_tcbinfo);
 1647 }
 1648 
 1649 struct socket *
 1650 inp_inpcbtosocket(struct inpcb *inp)
 1651 {
 1652 
 1653         INP_WLOCK_ASSERT(inp);
 1654         return (inp->inp_socket);
 1655 }
 1656 
 1657 struct tcpcb *
 1658 inp_inpcbtotcpcb(struct inpcb *inp)
 1659 {
 1660 
 1661         INP_WLOCK_ASSERT(inp);
 1662         return ((struct tcpcb *)inp->inp_ppcb);
 1663 }
 1664 
 1665 int
 1666 inp_ip_tos_get(const struct inpcb *inp)
 1667 {
 1668 
 1669         return (inp->inp_ip_tos);
 1670 }
 1671 
 1672 void
 1673 inp_ip_tos_set(struct inpcb *inp, int val)
 1674 {
 1675 
 1676         inp->inp_ip_tos = val;
 1677 }
 1678 
 1679 void
 1680 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
 1681     uint32_t *faddr, uint16_t *fp)
 1682 {
 1683 
 1684         INP_LOCK_ASSERT(inp);
 1685         *laddr = inp->inp_laddr.s_addr;
 1686         *faddr = inp->inp_faddr.s_addr;
 1687         *lp = inp->inp_lport;
 1688         *fp = inp->inp_fport;
 1689 }
 1690 
 1691 struct inpcb *
 1692 so_sotoinpcb(struct socket *so)
 1693 {
 1694 
 1695         return (sotoinpcb(so));
 1696 }
 1697 
 1698 struct tcpcb *
 1699 so_sototcpcb(struct socket *so)
 1700 {
 1701 
 1702         return (sototcpcb(so));
 1703 }
 1704 
 1705 #ifdef DDB
 1706 static void
 1707 db_print_indent(int indent)
 1708 {
 1709         int i;
 1710 
 1711         for (i = 0; i < indent; i++)
 1712                 db_printf(" ");
 1713 }
 1714 
 1715 static void
 1716 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
 1717 {
 1718         char faddr_str[48], laddr_str[48];
 1719 
 1720         db_print_indent(indent);
 1721         db_printf("%s at %p\n", name, inc);
 1722 
 1723         indent += 2;
 1724 
 1725 #ifdef INET6
 1726         if (inc->inc_flags & INC_ISIPV6) {
 1727                 /* IPv6. */
 1728                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
 1729                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
 1730         } else {
 1731 #endif
 1732                 /* IPv4. */
 1733                 inet_ntoa_r(inc->inc_laddr, laddr_str);
 1734                 inet_ntoa_r(inc->inc_faddr, faddr_str);
 1735 #ifdef INET6
 1736         }
 1737 #endif
 1738         db_print_indent(indent);
 1739         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
 1740             ntohs(inc->inc_lport));
 1741         db_print_indent(indent);
 1742         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
 1743             ntohs(inc->inc_fport));
 1744 }
 1745 
 1746 static void
 1747 db_print_inpflags(int inp_flags)
 1748 {
 1749         int comma;
 1750 
 1751         comma = 0;
 1752         if (inp_flags & INP_RECVOPTS) {
 1753                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
 1754                 comma = 1;
 1755         }
 1756         if (inp_flags & INP_RECVRETOPTS) {
 1757                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
 1758                 comma = 1;
 1759         }
 1760         if (inp_flags & INP_RECVDSTADDR) {
 1761                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
 1762                 comma = 1;
 1763         }
 1764         if (inp_flags & INP_HDRINCL) {
 1765                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
 1766                 comma = 1;
 1767         }
 1768         if (inp_flags & INP_HIGHPORT) {
 1769                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
 1770                 comma = 1;
 1771         }
 1772         if (inp_flags & INP_LOWPORT) {
 1773                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
 1774                 comma = 1;
 1775         }
 1776         if (inp_flags & INP_ANONPORT) {
 1777                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
 1778                 comma = 1;
 1779         }
 1780         if (inp_flags & INP_RECVIF) {
 1781                 db_printf("%sINP_RECVIF", comma ? ", " : "");
 1782                 comma = 1;
 1783         }
 1784         if (inp_flags & INP_MTUDISC) {
 1785                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
 1786                 comma = 1;
 1787         }
 1788         if (inp_flags & INP_FAITH) {
 1789                 db_printf("%sINP_FAITH", comma ? ", " : "");
 1790                 comma = 1;
 1791         }
 1792         if (inp_flags & INP_RECVTTL) {
 1793                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
 1794                 comma = 1;
 1795         }
 1796         if (inp_flags & INP_DONTFRAG) {
 1797                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
 1798                 comma = 1;
 1799         }
 1800         if (inp_flags & IN6P_IPV6_V6ONLY) {
 1801                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
 1802                 comma = 1;
 1803         }
 1804         if (inp_flags & IN6P_PKTINFO) {
 1805                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
 1806                 comma = 1;
 1807         }
 1808         if (inp_flags & IN6P_HOPLIMIT) {
 1809                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
 1810                 comma = 1;
 1811         }
 1812         if (inp_flags & IN6P_HOPOPTS) {
 1813                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
 1814                 comma = 1;
 1815         }
 1816         if (inp_flags & IN6P_DSTOPTS) {
 1817                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
 1818                 comma = 1;
 1819         }
 1820         if (inp_flags & IN6P_RTHDR) {
 1821                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
 1822                 comma = 1;
 1823         }
 1824         if (inp_flags & IN6P_RTHDRDSTOPTS) {
 1825                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
 1826                 comma = 1;
 1827         }
 1828         if (inp_flags & IN6P_TCLASS) {
 1829                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
 1830                 comma = 1;
 1831         }
 1832         if (inp_flags & IN6P_AUTOFLOWLABEL) {
 1833                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
 1834                 comma = 1;
 1835         }
 1836         if (inp_flags & INP_TIMEWAIT) {
 1837                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
 1838                 comma  = 1;
 1839         }
 1840         if (inp_flags & INP_ONESBCAST) {
 1841                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
 1842                 comma  = 1;
 1843         }
 1844         if (inp_flags & INP_DROPPED) {
 1845                 db_printf("%sINP_DROPPED", comma ? ", " : "");
 1846                 comma  = 1;
 1847         }
 1848         if (inp_flags & INP_SOCKREF) {
 1849                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
 1850                 comma  = 1;
 1851         }
 1852         if (inp_flags & IN6P_RFC2292) {
 1853                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
 1854                 comma = 1;
 1855         }
 1856         if (inp_flags & IN6P_MTU) {
 1857                 db_printf("IN6P_MTU%s", comma ? ", " : "");
 1858                 comma = 1;
 1859         }
 1860 }
 1861 
 1862 static void
 1863 db_print_inpvflag(u_char inp_vflag)
 1864 {
 1865         int comma;
 1866 
 1867         comma = 0;
 1868         if (inp_vflag & INP_IPV4) {
 1869                 db_printf("%sINP_IPV4", comma ? ", " : "");
 1870                 comma  = 1;
 1871         }
 1872         if (inp_vflag & INP_IPV6) {
 1873                 db_printf("%sINP_IPV6", comma ? ", " : "");
 1874                 comma  = 1;
 1875         }
 1876         if (inp_vflag & INP_IPV6PROTO) {
 1877                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
 1878                 comma  = 1;
 1879         }
 1880 }
 1881 
 1882 static void
 1883 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
 1884 {
 1885 
 1886         db_print_indent(indent);
 1887         db_printf("%s at %p\n", name, inp);
 1888 
 1889         indent += 2;
 1890 
 1891         db_print_indent(indent);
 1892         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
 1893 
 1894         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
 1895 
 1896         db_print_indent(indent);
 1897         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
 1898             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
 1899 
 1900         db_print_indent(indent);
 1901         db_printf("inp_label: %p   inp_flags: 0x%x (",
 1902            inp->inp_label, inp->inp_flags);
 1903         db_print_inpflags(inp->inp_flags);
 1904         db_printf(")\n");
 1905 
 1906         db_print_indent(indent);
 1907         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
 1908             inp->inp_vflag);
 1909         db_print_inpvflag(inp->inp_vflag);
 1910         db_printf(")\n");
 1911 
 1912         db_print_indent(indent);
 1913         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
 1914             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
 1915 
 1916         db_print_indent(indent);
 1917 #ifdef INET6
 1918         if (inp->inp_vflag & INP_IPV6) {
 1919                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
 1920                     "in6p_moptions: %p\n", inp->in6p_options,
 1921                     inp->in6p_outputopts, inp->in6p_moptions);
 1922                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
 1923                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
 1924                     inp->in6p_hops);
 1925         } else
 1926 #endif
 1927         {
 1928                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
 1929                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
 1930                     inp->inp_options, inp->inp_moptions);
 1931         }
 1932 
 1933         db_print_indent(indent);
 1934         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
 1935             (uintmax_t)inp->inp_gencnt);
 1936 }
 1937 
 1938 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
 1939 {
 1940         struct inpcb *inp;
 1941 
 1942         if (!have_addr) {
 1943                 db_printf("usage: show inpcb <addr>\n");
 1944                 return;
 1945         }
 1946         inp = (struct inpcb *)addr;
 1947 
 1948         db_print_inpcb(inp, "inpcb", 0);
 1949 }
 1950 #endif

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