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  * Copyright (c) 2010-2011 Juniper Networks, Inc.
    6  * All rights reserved.
    7  *
    8  * Portions of this software were developed by Robert N. M. Watson under
    9  * contract to Juniper Networks, Inc.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 4. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD: releng/9.0/sys/netinet/in_pcb.c 227428 2011-11-10 20:28:30Z trociny $");
   40 
   41 #include "opt_ddb.h"
   42 #include "opt_ipsec.h"
   43 #include "opt_inet.h"
   44 #include "opt_inet6.h"
   45 #include "opt_pcbgroup.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/malloc.h>
   50 #include <sys/mbuf.h>
   51 #include <sys/callout.h>
   52 #include <sys/domain.h>
   53 #include <sys/protosw.h>
   54 #include <sys/socket.h>
   55 #include <sys/socketvar.h>
   56 #include <sys/priv.h>
   57 #include <sys/proc.h>
   58 #include <sys/refcount.h>
   59 #include <sys/jail.h>
   60 #include <sys/kernel.h>
   61 #include <sys/sysctl.h>
   62 
   63 #ifdef DDB
   64 #include <ddb/ddb.h>
   65 #endif
   66 
   67 #include <vm/uma.h>
   68 
   69 #include <net/if.h>
   70 #include <net/if_types.h>
   71 #include <net/route.h>
   72 #include <net/vnet.h>
   73 
   74 #if defined(INET) || defined(INET6)
   75 #include <netinet/in.h>
   76 #include <netinet/in_pcb.h>
   77 #include <netinet/ip_var.h>
   78 #include <netinet/tcp_var.h>
   79 #include <netinet/udp.h>
   80 #include <netinet/udp_var.h>
   81 #endif
   82 #ifdef INET
   83 #include <netinet/in_var.h>
   84 #endif
   85 #ifdef INET6
   86 #include <netinet/ip6.h>
   87 #include <netinet6/in6_pcb.h>
   88 #include <netinet6/in6_var.h>
   89 #include <netinet6/ip6_var.h>
   90 #endif /* INET6 */
   91 
   92 
   93 #ifdef IPSEC
   94 #include <netipsec/ipsec.h>
   95 #include <netipsec/key.h>
   96 #endif /* IPSEC */
   97 
   98 #include <security/mac/mac_framework.h>
   99 
  100 static struct callout   ipport_tick_callout;
  101 
  102 /*
  103  * These configure the range of local port addresses assigned to
  104  * "unspecified" outgoing connections/packets/whatever.
  105  */
  106 VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1;    /* 1023 */
  107 VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART;    /* 600 */
  108 VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST;     /* 10000 */
  109 VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST;       /* 65535 */
  110 VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO;      /* 49152 */
  111 VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO;        /* 65535 */
  112 
  113 /*
  114  * Reserved ports accessible only to root. There are significant
  115  * security considerations that must be accounted for when changing these,
  116  * but the security benefits can be great. Please be careful.
  117  */
  118 VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1;    /* 1023 */
  119 VNET_DEFINE(int, ipport_reservedlow);
  120 
  121 /* Variables dealing with random ephemeral port allocation. */
  122 VNET_DEFINE(int, ipport_randomized) = 1;        /* user controlled via sysctl */
  123 VNET_DEFINE(int, ipport_randomcps) = 10;        /* user controlled via sysctl */
  124 VNET_DEFINE(int, ipport_randomtime) = 45;       /* user controlled via sysctl */
  125 VNET_DEFINE(int, ipport_stoprandom);            /* toggled by ipport_tick */
  126 VNET_DEFINE(int, ipport_tcpallocs);
  127 static VNET_DEFINE(int, ipport_tcplastcount);
  128 
  129 #define V_ipport_tcplastcount           VNET(ipport_tcplastcount)
  130 
  131 static void     in_pcbremlists(struct inpcb *inp);
  132 #ifdef INET
  133 static struct inpcb     *in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo,
  134                             struct in_addr faddr, u_int fport_arg,
  135                             struct in_addr laddr, u_int lport_arg,
  136                             int lookupflags, struct ifnet *ifp);
  137 
  138 #define RANGECHK(var, min, max) \
  139         if ((var) < (min)) { (var) = (min); } \
  140         else if ((var) > (max)) { (var) = (max); }
  141 
  142 static int
  143 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
  144 {
  145         int error;
  146 
  147 #ifdef VIMAGE
  148         error = vnet_sysctl_handle_int(oidp, arg1, arg2, req);
  149 #else
  150         error = sysctl_handle_int(oidp, arg1, arg2, req);
  151 #endif
  152         if (error == 0) {
  153                 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
  154                 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
  155                 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
  156                 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
  157                 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
  158                 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
  159         }
  160         return (error);
  161 }
  162 
  163 #undef RANGECHK
  164 
  165 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
  166 
  167 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst,
  168         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowfirstauto), 0,
  169         &sysctl_net_ipport_check, "I", "");
  170 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast,
  171         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowlastauto), 0,
  172         &sysctl_net_ipport_check, "I", "");
  173 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, first,
  174         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_firstauto), 0,
  175         &sysctl_net_ipport_check, "I", "");
  176 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, last,
  177         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lastauto), 0,
  178         &sysctl_net_ipport_check, "I", "");
  179 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst,
  180         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hifirstauto), 0,
  181         &sysctl_net_ipport_check, "I", "");
  182 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hilast,
  183         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hilastauto), 0,
  184         &sysctl_net_ipport_check, "I", "");
  185 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
  186         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedhigh), 0, "");
  187 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
  188         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, "");
  189 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
  190         &VNET_NAME(ipport_randomized), 0, "Enable random port allocation");
  191 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
  192         &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port "
  193         "allocations before switching to a sequental one");
  194 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
  195         &VNET_NAME(ipport_randomtime), 0,
  196         "Minimum time to keep sequental port "
  197         "allocation before switching to a random one");
  198 #endif
  199 
  200 /*
  201  * in_pcb.c: manage the Protocol Control Blocks.
  202  *
  203  * NOTE: It is assumed that most of these functions will be called with
  204  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
  205  * functions often modify hash chains or addresses in pcbs.
  206  */
  207 
  208 /*
  209  * Initialize an inpcbinfo -- we should be able to reduce the number of
  210  * arguments in time.
  211  */
  212 void
  213 in_pcbinfo_init(struct inpcbinfo *pcbinfo, const char *name,
  214     struct inpcbhead *listhead, int hash_nelements, int porthash_nelements,
  215     char *inpcbzone_name, uma_init inpcbzone_init, uma_fini inpcbzone_fini,
  216     uint32_t inpcbzone_flags, u_int hashfields)
  217 {
  218 
  219         INP_INFO_LOCK_INIT(pcbinfo, name);
  220         INP_HASH_LOCK_INIT(pcbinfo, "pcbinfohash");     /* XXXRW: argument? */
  221 #ifdef VIMAGE
  222         pcbinfo->ipi_vnet = curvnet;
  223 #endif
  224         pcbinfo->ipi_listhead = listhead;
  225         LIST_INIT(pcbinfo->ipi_listhead);
  226         pcbinfo->ipi_count = 0;
  227         pcbinfo->ipi_hashbase = hashinit(hash_nelements, M_PCB,
  228             &pcbinfo->ipi_hashmask);
  229         pcbinfo->ipi_porthashbase = hashinit(porthash_nelements, M_PCB,
  230             &pcbinfo->ipi_porthashmask);
  231 #ifdef PCBGROUP
  232         in_pcbgroup_init(pcbinfo, hashfields, hash_nelements);
  233 #endif
  234         pcbinfo->ipi_zone = uma_zcreate(inpcbzone_name, sizeof(struct inpcb),
  235             NULL, NULL, inpcbzone_init, inpcbzone_fini, UMA_ALIGN_PTR,
  236             inpcbzone_flags);
  237         uma_zone_set_max(pcbinfo->ipi_zone, maxsockets);
  238 }
  239 
  240 /*
  241  * Destroy an inpcbinfo.
  242  */
  243 void
  244 in_pcbinfo_destroy(struct inpcbinfo *pcbinfo)
  245 {
  246 
  247         KASSERT(pcbinfo->ipi_count == 0,
  248             ("%s: ipi_count = %u", __func__, pcbinfo->ipi_count));
  249 
  250         hashdestroy(pcbinfo->ipi_hashbase, M_PCB, pcbinfo->ipi_hashmask);
  251         hashdestroy(pcbinfo->ipi_porthashbase, M_PCB,
  252             pcbinfo->ipi_porthashmask);
  253 #ifdef PCBGROUP
  254         in_pcbgroup_destroy(pcbinfo);
  255 #endif
  256         uma_zdestroy(pcbinfo->ipi_zone);
  257         INP_HASH_LOCK_DESTROY(pcbinfo);
  258         INP_INFO_LOCK_DESTROY(pcbinfo);
  259 }
  260 
  261 /*
  262  * Allocate a PCB and associate it with the socket.
  263  * On success return with the PCB locked.
  264  */
  265 int
  266 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
  267 {
  268         struct inpcb *inp;
  269         int error;
  270 
  271         INP_INFO_WLOCK_ASSERT(pcbinfo);
  272         error = 0;
  273         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
  274         if (inp == NULL)
  275                 return (ENOBUFS);
  276         bzero(inp, inp_zero_size);
  277         inp->inp_pcbinfo = pcbinfo;
  278         inp->inp_socket = so;
  279         inp->inp_cred = crhold(so->so_cred);
  280         inp->inp_inc.inc_fibnum = so->so_fibnum;
  281 #ifdef MAC
  282         error = mac_inpcb_init(inp, M_NOWAIT);
  283         if (error != 0)
  284                 goto out;
  285         mac_inpcb_create(so, inp);
  286 #endif
  287 #ifdef IPSEC
  288         error = ipsec_init_policy(so, &inp->inp_sp);
  289         if (error != 0) {
  290 #ifdef MAC
  291                 mac_inpcb_destroy(inp);
  292 #endif
  293                 goto out;
  294         }
  295 #endif /*IPSEC*/
  296 #ifdef INET6
  297         if (INP_SOCKAF(so) == AF_INET6) {
  298                 inp->inp_vflag |= INP_IPV6PROTO;
  299                 if (V_ip6_v6only)
  300                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
  301         }
  302 #endif
  303         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
  304         pcbinfo->ipi_count++;
  305         so->so_pcb = (caddr_t)inp;
  306 #ifdef INET6
  307         if (V_ip6_auto_flowlabel)
  308                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
  309 #endif
  310         INP_WLOCK(inp);
  311         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
  312         refcount_init(&inp->inp_refcount, 1);   /* Reference from inpcbinfo */
  313 #if defined(IPSEC) || defined(MAC)
  314 out:
  315         if (error != 0) {
  316                 crfree(inp->inp_cred);
  317                 uma_zfree(pcbinfo->ipi_zone, inp);
  318         }
  319 #endif
  320         return (error);
  321 }
  322 
  323 #ifdef INET
  324 int
  325 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
  326 {
  327         int anonport, error;
  328 
  329         INP_WLOCK_ASSERT(inp);
  330         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
  331 
  332         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
  333                 return (EINVAL);
  334         anonport = inp->inp_lport == 0 && (nam == NULL ||
  335             ((struct sockaddr_in *)nam)->sin_port == 0);
  336         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
  337             &inp->inp_lport, cred);
  338         if (error)
  339                 return (error);
  340         if (in_pcbinshash(inp) != 0) {
  341                 inp->inp_laddr.s_addr = INADDR_ANY;
  342                 inp->inp_lport = 0;
  343                 return (EAGAIN);
  344         }
  345         if (anonport)
  346                 inp->inp_flags |= INP_ANONPORT;
  347         return (0);
  348 }
  349 #endif
  350 
  351 #if defined(INET) || defined(INET6)
  352 int
  353 in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp,
  354     struct ucred *cred, int lookupflags)
  355 {
  356         struct inpcbinfo *pcbinfo;
  357         struct inpcb *tmpinp;
  358         unsigned short *lastport;
  359         int count, dorandom, error;
  360         u_short aux, first, last, lport;
  361 #ifdef INET
  362         struct in_addr laddr;
  363 #endif
  364 
  365         pcbinfo = inp->inp_pcbinfo;
  366 
  367         /*
  368          * Because no actual state changes occur here, a global write lock on
  369          * the pcbinfo isn't required.
  370          */
  371         INP_LOCK_ASSERT(inp);
  372         INP_HASH_LOCK_ASSERT(pcbinfo);
  373 
  374         if (inp->inp_flags & INP_HIGHPORT) {
  375                 first = V_ipport_hifirstauto;   /* sysctl */
  376                 last  = V_ipport_hilastauto;
  377                 lastport = &pcbinfo->ipi_lasthi;
  378         } else if (inp->inp_flags & INP_LOWPORT) {
  379                 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
  380                 if (error)
  381                         return (error);
  382                 first = V_ipport_lowfirstauto;  /* 1023 */
  383                 last  = V_ipport_lowlastauto;   /* 600 */
  384                 lastport = &pcbinfo->ipi_lastlow;
  385         } else {
  386                 first = V_ipport_firstauto;     /* sysctl */
  387                 last  = V_ipport_lastauto;
  388                 lastport = &pcbinfo->ipi_lastport;
  389         }
  390         /*
  391          * For UDP, use random port allocation as long as the user
  392          * allows it.  For TCP (and as of yet unknown) connections,
  393          * use random port allocation only if the user allows it AND
  394          * ipport_tick() allows it.
  395          */
  396         if (V_ipport_randomized &&
  397                 (!V_ipport_stoprandom || pcbinfo == &V_udbinfo))
  398                 dorandom = 1;
  399         else
  400                 dorandom = 0;
  401         /*
  402          * It makes no sense to do random port allocation if
  403          * we have the only port available.
  404          */
  405         if (first == last)
  406                 dorandom = 0;
  407         /* Make sure to not include UDP packets in the count. */
  408         if (pcbinfo != &V_udbinfo)
  409                 V_ipport_tcpallocs++;
  410         /*
  411          * Instead of having two loops further down counting up or down
  412          * make sure that first is always <= last and go with only one
  413          * code path implementing all logic.
  414          */
  415         if (first > last) {
  416                 aux = first;
  417                 first = last;
  418                 last = aux;
  419         }
  420 
  421 #ifdef INET
  422         /* Make the compiler happy. */
  423         laddr.s_addr = 0;
  424         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) {
  425                 KASSERT(laddrp != NULL, ("%s: laddrp NULL for v4 inp %p",
  426                     __func__, inp));
  427                 laddr = *laddrp;
  428         }
  429 #endif
  430         tmpinp = NULL;  /* Make compiler happy. */
  431         lport = *lportp;
  432 
  433         if (dorandom)
  434                 *lastport = first + (arc4random() % (last - first));
  435 
  436         count = last - first;
  437 
  438         do {
  439                 if (count-- < 0)        /* completely used? */
  440                         return (EADDRNOTAVAIL);
  441                 ++*lastport;
  442                 if (*lastport < first || *lastport > last)
  443                         *lastport = first;
  444                 lport = htons(*lastport);
  445 
  446 #ifdef INET6
  447                 if ((inp->inp_vflag & INP_IPV6) != 0)
  448                         tmpinp = in6_pcblookup_local(pcbinfo,
  449                             &inp->in6p_laddr, lport, lookupflags, cred);
  450 #endif
  451 #if defined(INET) && defined(INET6)
  452                 else
  453 #endif
  454 #ifdef INET
  455                         tmpinp = in_pcblookup_local(pcbinfo, laddr,
  456                             lport, lookupflags, cred);
  457 #endif
  458         } while (tmpinp != NULL);
  459 
  460 #ifdef INET
  461         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4)
  462                 laddrp->s_addr = laddr.s_addr;
  463 #endif                 
  464         *lportp = lport;
  465 
  466         return (0);
  467 }
  468 #endif /* INET || INET6 */
  469 
  470 #ifdef INET
  471 /*
  472  * Set up a bind operation on a PCB, performing port allocation
  473  * as required, but do not actually modify the PCB. Callers can
  474  * either complete the bind by setting inp_laddr/inp_lport and
  475  * calling in_pcbinshash(), or they can just use the resulting
  476  * port and address to authorise the sending of a once-off packet.
  477  *
  478  * On error, the values of *laddrp and *lportp are not changed.
  479  */
  480 int
  481 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
  482     u_short *lportp, struct ucred *cred)
  483 {
  484         struct socket *so = inp->inp_socket;
  485         struct sockaddr_in *sin;
  486         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
  487         struct in_addr laddr;
  488         u_short lport = 0;
  489         int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT);
  490         int error;
  491 
  492         /*
  493          * No state changes, so read locks are sufficient here.
  494          */
  495         INP_LOCK_ASSERT(inp);
  496         INP_HASH_LOCK_ASSERT(pcbinfo);
  497 
  498         if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
  499                 return (EADDRNOTAVAIL);
  500         laddr.s_addr = *laddrp;
  501         if (nam != NULL && laddr.s_addr != INADDR_ANY)
  502                 return (EINVAL);
  503         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
  504                 lookupflags = INPLOOKUP_WILDCARD;
  505         if (nam == NULL) {
  506                 if ((error = prison_local_ip4(cred, &laddr)) != 0)
  507                         return (error);
  508         } else {
  509                 sin = (struct sockaddr_in *)nam;
  510                 if (nam->sa_len != sizeof (*sin))
  511                         return (EINVAL);
  512 #ifdef notdef
  513                 /*
  514                  * We should check the family, but old programs
  515                  * incorrectly fail to initialize it.
  516                  */
  517                 if (sin->sin_family != AF_INET)
  518                         return (EAFNOSUPPORT);
  519 #endif
  520                 error = prison_local_ip4(cred, &sin->sin_addr);
  521                 if (error)
  522                         return (error);
  523                 if (sin->sin_port != *lportp) {
  524                         /* Don't allow the port to change. */
  525                         if (*lportp != 0)
  526                                 return (EINVAL);
  527                         lport = sin->sin_port;
  528                 }
  529                 /* NB: lport is left as 0 if the port isn't being changed. */
  530                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
  531                         /*
  532                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
  533                          * allow complete duplication of binding if
  534                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
  535                          * and a multicast address is bound on both
  536                          * new and duplicated sockets.
  537                          */
  538                         if (so->so_options & SO_REUSEADDR)
  539                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
  540                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
  541                         sin->sin_port = 0;              /* yech... */
  542                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  543                         /*
  544                          * Is the address a local IP address? 
  545                          * If INP_BINDANY is set, then the socket may be bound
  546                          * to any endpoint address, local or not.
  547                          */
  548                         if ((inp->inp_flags & INP_BINDANY) == 0 &&
  549                             ifa_ifwithaddr_check((struct sockaddr *)sin) == 0) 
  550                                 return (EADDRNOTAVAIL);
  551                 }
  552                 laddr = sin->sin_addr;
  553                 if (lport) {
  554                         struct inpcb *t;
  555                         struct tcptw *tw;
  556 
  557                         /* GROSS */
  558                         if (ntohs(lport) <= V_ipport_reservedhigh &&
  559                             ntohs(lport) >= V_ipport_reservedlow &&
  560                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
  561                             0))
  562                                 return (EACCES);
  563                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
  564                             priv_check_cred(inp->inp_cred,
  565                             PRIV_NETINET_REUSEPORT, 0) != 0) {
  566                                 t = in_pcblookup_local(pcbinfo, sin->sin_addr,
  567                                     lport, INPLOOKUP_WILDCARD, cred);
  568         /*
  569          * XXX
  570          * This entire block sorely needs a rewrite.
  571          */
  572                                 if (t &&
  573                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
  574                                     (so->so_type != SOCK_STREAM ||
  575                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
  576                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
  577                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
  578                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
  579                                     (inp->inp_cred->cr_uid !=
  580                                      t->inp_cred->cr_uid))
  581                                         return (EADDRINUSE);
  582                         }
  583                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
  584                             lport, lookupflags, cred);
  585                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
  586                                 /*
  587                                  * XXXRW: If an incpb has had its timewait
  588                                  * state recycled, we treat the address as
  589                                  * being in use (for now).  This is better
  590                                  * than a panic, but not desirable.
  591                                  */
  592                                 tw = intotw(t);
  593                                 if (tw == NULL ||
  594                                     (reuseport & tw->tw_so_options) == 0)
  595                                         return (EADDRINUSE);
  596                         } else if (t && (reuseport == 0 ||
  597                             (t->inp_flags2 & INP_REUSEPORT) == 0)) {
  598 #ifdef INET6
  599                                 if (ntohl(sin->sin_addr.s_addr) !=
  600                                     INADDR_ANY ||
  601                                     ntohl(t->inp_laddr.s_addr) !=
  602                                     INADDR_ANY ||
  603                                     (inp->inp_vflag & INP_IPV6PROTO) == 0 ||
  604                                     (t->inp_vflag & INP_IPV6PROTO) == 0)
  605 #endif
  606                                 return (EADDRINUSE);
  607                         }
  608                 }
  609         }
  610         if (*lportp != 0)
  611                 lport = *lportp;
  612         if (lport == 0) {
  613                 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags);
  614                 if (error != 0)
  615                         return (error);
  616 
  617         }
  618         *laddrp = laddr.s_addr;
  619         *lportp = lport;
  620         return (0);
  621 }
  622 
  623 /*
  624  * Connect from a socket to a specified address.
  625  * Both address and port must be specified in argument sin.
  626  * If don't have a local address for this socket yet,
  627  * then pick one.
  628  */
  629 int
  630 in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
  631     struct ucred *cred, struct mbuf *m)
  632 {
  633         u_short lport, fport;
  634         in_addr_t laddr, faddr;
  635         int anonport, error;
  636 
  637         INP_WLOCK_ASSERT(inp);
  638         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
  639 
  640         lport = inp->inp_lport;
  641         laddr = inp->inp_laddr.s_addr;
  642         anonport = (lport == 0);
  643         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
  644             NULL, cred);
  645         if (error)
  646                 return (error);
  647 
  648         /* Do the initial binding of the local address if required. */
  649         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
  650                 inp->inp_lport = lport;
  651                 inp->inp_laddr.s_addr = laddr;
  652                 if (in_pcbinshash(inp) != 0) {
  653                         inp->inp_laddr.s_addr = INADDR_ANY;
  654                         inp->inp_lport = 0;
  655                         return (EAGAIN);
  656                 }
  657         }
  658 
  659         /* Commit the remaining changes. */
  660         inp->inp_lport = lport;
  661         inp->inp_laddr.s_addr = laddr;
  662         inp->inp_faddr.s_addr = faddr;
  663         inp->inp_fport = fport;
  664         in_pcbrehash_mbuf(inp, m);
  665 
  666         if (anonport)
  667                 inp->inp_flags |= INP_ANONPORT;
  668         return (0);
  669 }
  670 
  671 int
  672 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
  673 {
  674 
  675         return (in_pcbconnect_mbuf(inp, nam, cred, NULL));
  676 }
  677 
  678 /*
  679  * Do proper source address selection on an unbound socket in case
  680  * of connect. Take jails into account as well.
  681  */
  682 static int
  683 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
  684     struct ucred *cred)
  685 {
  686         struct ifaddr *ifa;
  687         struct sockaddr *sa;
  688         struct sockaddr_in *sin;
  689         struct route sro;
  690         int error;
  691 
  692         KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
  693 
  694         /*
  695          * Bypass source address selection and use the primary jail IP
  696          * if requested.
  697          */
  698         if (cred != NULL && !prison_saddrsel_ip4(cred, laddr))
  699                 return (0);
  700 
  701         error = 0;
  702         bzero(&sro, sizeof(sro));
  703 
  704         sin = (struct sockaddr_in *)&sro.ro_dst;
  705         sin->sin_family = AF_INET;
  706         sin->sin_len = sizeof(struct sockaddr_in);
  707         sin->sin_addr.s_addr = faddr->s_addr;
  708 
  709         /*
  710          * If route is known our src addr is taken from the i/f,
  711          * else punt.
  712          *
  713          * Find out route to destination.
  714          */
  715         if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
  716                 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
  717 
  718         /*
  719          * If we found a route, use the address corresponding to
  720          * the outgoing interface.
  721          * 
  722          * Otherwise assume faddr is reachable on a directly connected
  723          * network and try to find a corresponding interface to take
  724          * the source address from.
  725          */
  726         if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
  727                 struct in_ifaddr *ia;
  728                 struct ifnet *ifp;
  729 
  730                 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin));
  731                 if (ia == NULL)
  732                         ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0));
  733                 if (ia == NULL) {
  734                         error = ENETUNREACH;
  735                         goto done;
  736                 }
  737 
  738                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
  739                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  740                         ifa_free(&ia->ia_ifa);
  741                         goto done;
  742                 }
  743 
  744                 ifp = ia->ia_ifp;
  745                 ifa_free(&ia->ia_ifa);
  746                 ia = NULL;
  747                 IF_ADDR_LOCK(ifp);
  748                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  749 
  750                         sa = ifa->ifa_addr;
  751                         if (sa->sa_family != AF_INET)
  752                                 continue;
  753                         sin = (struct sockaddr_in *)sa;
  754                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
  755                                 ia = (struct in_ifaddr *)ifa;
  756                                 break;
  757                         }
  758                 }
  759                 if (ia != NULL) {
  760                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  761                         IF_ADDR_UNLOCK(ifp);
  762                         goto done;
  763                 }
  764                 IF_ADDR_UNLOCK(ifp);
  765 
  766                 /* 3. As a last resort return the 'default' jail address. */
  767                 error = prison_get_ip4(cred, laddr);
  768                 goto done;
  769         }
  770 
  771         /*
  772          * If the outgoing interface on the route found is not
  773          * a loopback interface, use the address from that interface.
  774          * In case of jails do those three steps:
  775          * 1. check if the interface address belongs to the jail. If so use it.
  776          * 2. check if we have any address on the outgoing interface
  777          *    belonging to this jail. If so use it.
  778          * 3. as a last resort return the 'default' jail address.
  779          */
  780         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
  781                 struct in_ifaddr *ia;
  782                 struct ifnet *ifp;
  783 
  784                 /* If not jailed, use the default returned. */
  785                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
  786                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
  787                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  788                         goto done;
  789                 }
  790 
  791                 /* Jailed. */
  792                 /* 1. Check if the iface address belongs to the jail. */
  793                 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
  794                 if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
  795                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
  796                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  797                         goto done;
  798                 }
  799 
  800                 /*
  801                  * 2. Check if we have any address on the outgoing interface
  802                  *    belonging to this jail.
  803                  */
  804                 ia = NULL;
  805                 ifp = sro.ro_rt->rt_ifp;
  806                 IF_ADDR_LOCK(ifp);
  807                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  808                         sa = ifa->ifa_addr;
  809                         if (sa->sa_family != AF_INET)
  810                                 continue;
  811                         sin = (struct sockaddr_in *)sa;
  812                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
  813                                 ia = (struct in_ifaddr *)ifa;
  814                                 break;
  815                         }
  816                 }
  817                 if (ia != NULL) {
  818                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  819                         IF_ADDR_UNLOCK(ifp);
  820                         goto done;
  821                 }
  822                 IF_ADDR_UNLOCK(ifp);
  823 
  824                 /* 3. As a last resort return the 'default' jail address. */
  825                 error = prison_get_ip4(cred, laddr);
  826                 goto done;
  827         }
  828 
  829         /*
  830          * The outgoing interface is marked with 'loopback net', so a route
  831          * to ourselves is here.
  832          * Try to find the interface of the destination address and then
  833          * take the address from there. That interface is not necessarily
  834          * a loopback interface.
  835          * In case of jails, check that it is an address of the jail
  836          * and if we cannot find, fall back to the 'default' jail address.
  837          */
  838         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
  839                 struct sockaddr_in sain;
  840                 struct in_ifaddr *ia;
  841 
  842                 bzero(&sain, sizeof(struct sockaddr_in));
  843                 sain.sin_family = AF_INET;
  844                 sain.sin_len = sizeof(struct sockaddr_in);
  845                 sain.sin_addr.s_addr = faddr->s_addr;
  846 
  847                 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain)));
  848                 if (ia == NULL)
  849                         ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0));
  850                 if (ia == NULL)
  851                         ia = ifatoia(ifa_ifwithaddr(sintosa(&sain)));
  852 
  853                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
  854                         if (ia == NULL) {
  855                                 error = ENETUNREACH;
  856                                 goto done;
  857                         }
  858                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  859                         ifa_free(&ia->ia_ifa);
  860                         goto done;
  861                 }
  862 
  863                 /* Jailed. */
  864                 if (ia != NULL) {
  865                         struct ifnet *ifp;
  866 
  867                         ifp = ia->ia_ifp;
  868                         ifa_free(&ia->ia_ifa);
  869                         ia = NULL;
  870                         IF_ADDR_LOCK(ifp);
  871                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  872 
  873                                 sa = ifa->ifa_addr;
  874                                 if (sa->sa_family != AF_INET)
  875                                         continue;
  876                                 sin = (struct sockaddr_in *)sa;
  877                                 if (prison_check_ip4(cred,
  878                                     &sin->sin_addr) == 0) {
  879                                         ia = (struct in_ifaddr *)ifa;
  880                                         break;
  881                                 }
  882                         }
  883                         if (ia != NULL) {
  884                                 laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  885                                 IF_ADDR_UNLOCK(ifp);
  886                                 goto done;
  887                         }
  888                         IF_ADDR_UNLOCK(ifp);
  889                 }
  890 
  891                 /* 3. As a last resort return the 'default' jail address. */
  892                 error = prison_get_ip4(cred, laddr);
  893                 goto done;
  894         }
  895 
  896 done:
  897         if (sro.ro_rt != NULL)
  898                 RTFREE(sro.ro_rt);
  899         return (error);
  900 }
  901 
  902 /*
  903  * Set up for a connect from a socket to the specified address.
  904  * On entry, *laddrp and *lportp should contain the current local
  905  * address and port for the PCB; these are updated to the values
  906  * that should be placed in inp_laddr and inp_lport to complete
  907  * the connect.
  908  *
  909  * On success, *faddrp and *fportp will be set to the remote address
  910  * and port. These are not updated in the error case.
  911  *
  912  * If the operation fails because the connection already exists,
  913  * *oinpp will be set to the PCB of that connection so that the
  914  * caller can decide to override it. In all other cases, *oinpp
  915  * is set to NULL.
  916  */
  917 int
  918 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
  919     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
  920     struct inpcb **oinpp, struct ucred *cred)
  921 {
  922         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
  923         struct in_ifaddr *ia;
  924         struct inpcb *oinp;
  925         struct in_addr laddr, faddr;
  926         u_short lport, fport;
  927         int error;
  928 
  929         /*
  930          * Because a global state change doesn't actually occur here, a read
  931          * lock is sufficient.
  932          */
  933         INP_LOCK_ASSERT(inp);
  934         INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo);
  935 
  936         if (oinpp != NULL)
  937                 *oinpp = NULL;
  938         if (nam->sa_len != sizeof (*sin))
  939                 return (EINVAL);
  940         if (sin->sin_family != AF_INET)
  941                 return (EAFNOSUPPORT);
  942         if (sin->sin_port == 0)
  943                 return (EADDRNOTAVAIL);
  944         laddr.s_addr = *laddrp;
  945         lport = *lportp;
  946         faddr = sin->sin_addr;
  947         fport = sin->sin_port;
  948 
  949         if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
  950                 /*
  951                  * If the destination address is INADDR_ANY,
  952                  * use the primary local address.
  953                  * If the supplied address is INADDR_BROADCAST,
  954                  * and the primary interface supports broadcast,
  955                  * choose the broadcast address for that interface.
  956                  */
  957                 if (faddr.s_addr == INADDR_ANY) {
  958                         IN_IFADDR_RLOCK();
  959                         faddr =
  960                             IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
  961                         IN_IFADDR_RUNLOCK();
  962                         if (cred != NULL &&
  963                             (error = prison_get_ip4(cred, &faddr)) != 0)
  964                                 return (error);
  965                 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
  966                         IN_IFADDR_RLOCK();
  967                         if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
  968                             IFF_BROADCAST)
  969                                 faddr = satosin(&TAILQ_FIRST(
  970                                     &V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
  971                         IN_IFADDR_RUNLOCK();
  972                 }
  973         }
  974         if (laddr.s_addr == INADDR_ANY) {
  975                 error = in_pcbladdr(inp, &faddr, &laddr, cred);
  976                 /*
  977                  * If the destination address is multicast and an outgoing
  978                  * interface has been set as a multicast option, prefer the
  979                  * address of that interface as our source address.
  980                  */
  981                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
  982                     inp->inp_moptions != NULL) {
  983                         struct ip_moptions *imo;
  984                         struct ifnet *ifp;
  985 
  986                         imo = inp->inp_moptions;
  987                         if (imo->imo_multicast_ifp != NULL) {
  988                                 ifp = imo->imo_multicast_ifp;
  989                                 IN_IFADDR_RLOCK();
  990                                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
  991                                         if ((ia->ia_ifp == ifp) &&
  992                                             (cred == NULL ||
  993                                             prison_check_ip4(cred,
  994                                             &ia->ia_addr.sin_addr) == 0))
  995                                                 break;
  996                                 }
  997                                 if (ia == NULL)
  998                                         error = EADDRNOTAVAIL;
  999                                 else {
 1000                                         laddr = ia->ia_addr.sin_addr;
 1001                                         error = 0;
 1002                                 }
 1003                                 IN_IFADDR_RUNLOCK();
 1004                         }
 1005                 }
 1006                 if (error)
 1007                         return (error);
 1008         }
 1009         oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, fport,
 1010             laddr, lport, 0, NULL);
 1011         if (oinp != NULL) {
 1012                 if (oinpp != NULL)
 1013                         *oinpp = oinp;
 1014                 return (EADDRINUSE);
 1015         }
 1016         if (lport == 0) {
 1017                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
 1018                     cred);
 1019                 if (error)
 1020                         return (error);
 1021         }
 1022         *laddrp = laddr.s_addr;
 1023         *lportp = lport;
 1024         *faddrp = faddr.s_addr;
 1025         *fportp = fport;
 1026         return (0);
 1027 }
 1028 
 1029 void
 1030 in_pcbdisconnect(struct inpcb *inp)
 1031 {
 1032 
 1033         INP_WLOCK_ASSERT(inp);
 1034         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 1035 
 1036         inp->inp_faddr.s_addr = INADDR_ANY;
 1037         inp->inp_fport = 0;
 1038         in_pcbrehash(inp);
 1039 }
 1040 #endif
 1041 
 1042 /*
 1043  * in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
 1044  * For most protocols, this will be invoked immediately prior to calling
 1045  * in_pcbfree().  However, with TCP the inpcb may significantly outlive the
 1046  * socket, in which case in_pcbfree() is deferred.
 1047  */
 1048 void
 1049 in_pcbdetach(struct inpcb *inp)
 1050 {
 1051 
 1052         KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
 1053 
 1054         inp->inp_socket->so_pcb = NULL;
 1055         inp->inp_socket = NULL;
 1056 }
 1057 
 1058 /*
 1059  * in_pcbref() bumps the reference count on an inpcb in order to maintain
 1060  * stability of an inpcb pointer despite the inpcb lock being released.  This
 1061  * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
 1062  * but where the inpcb lock may already held, or when acquiring a reference
 1063  * via a pcbgroup.
 1064  *
 1065  * in_pcbref() should be used only to provide brief memory stability, and
 1066  * must always be followed by a call to INP_WLOCK() and in_pcbrele() to
 1067  * garbage collect the inpcb if it has been in_pcbfree()'d from another
 1068  * context.  Until in_pcbrele() has returned that the inpcb is still valid,
 1069  * lock and rele are the *only* safe operations that may be performed on the
 1070  * inpcb.
 1071  *
 1072  * While the inpcb will not be freed, releasing the inpcb lock means that the
 1073  * connection's state may change, so the caller should be careful to
 1074  * revalidate any cached state on reacquiring the lock.  Drop the reference
 1075  * using in_pcbrele().
 1076  */
 1077 void
 1078 in_pcbref(struct inpcb *inp)
 1079 {
 1080 
 1081         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
 1082 
 1083         refcount_acquire(&inp->inp_refcount);
 1084 }
 1085 
 1086 /*
 1087  * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
 1088  * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
 1089  * return a flag indicating whether or not the inpcb remains valid.  If it is
 1090  * valid, we return with the inpcb lock held.
 1091  *
 1092  * Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a
 1093  * reference on an inpcb.  Historically more work was done here (actually, in
 1094  * in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the
 1095  * need for the pcbinfo lock in in_pcbrele().  Deferring the free is entirely
 1096  * about memory stability (and continued use of the write lock).
 1097  */
 1098 int
 1099 in_pcbrele_rlocked(struct inpcb *inp)
 1100 {
 1101         struct inpcbinfo *pcbinfo;
 1102 
 1103         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
 1104 
 1105         INP_RLOCK_ASSERT(inp);
 1106 
 1107         if (refcount_release(&inp->inp_refcount) == 0)
 1108                 return (0);
 1109 
 1110         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
 1111 
 1112         INP_RUNLOCK(inp);
 1113         pcbinfo = inp->inp_pcbinfo;
 1114         uma_zfree(pcbinfo->ipi_zone, inp);
 1115         return (1);
 1116 }
 1117 
 1118 int
 1119 in_pcbrele_wlocked(struct inpcb *inp)
 1120 {
 1121         struct inpcbinfo *pcbinfo;
 1122 
 1123         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
 1124 
 1125         INP_WLOCK_ASSERT(inp);
 1126 
 1127         if (refcount_release(&inp->inp_refcount) == 0)
 1128                 return (0);
 1129 
 1130         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
 1131 
 1132         INP_WUNLOCK(inp);
 1133         pcbinfo = inp->inp_pcbinfo;
 1134         uma_zfree(pcbinfo->ipi_zone, inp);
 1135         return (1);
 1136 }
 1137 
 1138 /*
 1139  * Temporary wrapper.
 1140  */
 1141 int
 1142 in_pcbrele(struct inpcb *inp)
 1143 {
 1144 
 1145         return (in_pcbrele_wlocked(inp));
 1146 }
 1147 
 1148 /*
 1149  * Unconditionally schedule an inpcb to be freed by decrementing its
 1150  * reference count, which should occur only after the inpcb has been detached
 1151  * from its socket.  If another thread holds a temporary reference (acquired
 1152  * using in_pcbref()) then the free is deferred until that reference is
 1153  * released using in_pcbrele(), but the inpcb is still unlocked.  Almost all
 1154  * work, including removal from global lists, is done in this context, where
 1155  * the pcbinfo lock is held.
 1156  */
 1157 void
 1158 in_pcbfree(struct inpcb *inp)
 1159 {
 1160         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 1161 
 1162         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
 1163 
 1164         INP_INFO_WLOCK_ASSERT(pcbinfo);
 1165         INP_WLOCK_ASSERT(inp);
 1166 
 1167         /* XXXRW: Do as much as possible here. */
 1168 #ifdef IPSEC
 1169         if (inp->inp_sp != NULL)
 1170                 ipsec_delete_pcbpolicy(inp);
 1171 #endif /* IPSEC */
 1172         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 1173         in_pcbremlists(inp);
 1174 #ifdef INET6
 1175         if (inp->inp_vflag & INP_IPV6PROTO) {
 1176                 ip6_freepcbopts(inp->in6p_outputopts);
 1177                 if (inp->in6p_moptions != NULL)
 1178                         ip6_freemoptions(inp->in6p_moptions);
 1179         }
 1180 #endif
 1181         if (inp->inp_options)
 1182                 (void)m_free(inp->inp_options);
 1183 #ifdef INET
 1184         if (inp->inp_moptions != NULL)
 1185                 inp_freemoptions(inp->inp_moptions);
 1186 #endif
 1187         inp->inp_vflag = 0;
 1188         crfree(inp->inp_cred);
 1189 #ifdef MAC
 1190         mac_inpcb_destroy(inp);
 1191 #endif
 1192         if (!in_pcbrele_wlocked(inp))
 1193                 INP_WUNLOCK(inp);
 1194 }
 1195 
 1196 /*
 1197  * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
 1198  * port reservation, and preventing it from being returned by inpcb lookups.
 1199  *
 1200  * It is used by TCP to mark an inpcb as unused and avoid future packet
 1201  * delivery or event notification when a socket remains open but TCP has
 1202  * closed.  This might occur as a result of a shutdown()-initiated TCP close
 1203  * or a RST on the wire, and allows the port binding to be reused while still
 1204  * maintaining the invariant that so_pcb always points to a valid inpcb until
 1205  * in_pcbdetach().
 1206  *
 1207  * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
 1208  * in_pcbnotifyall() and in_pcbpurgeif0()?
 1209  */
 1210 void
 1211 in_pcbdrop(struct inpcb *inp)
 1212 {
 1213 
 1214         INP_WLOCK_ASSERT(inp);
 1215 
 1216         /*
 1217          * XXXRW: Possibly we should protect the setting of INP_DROPPED with
 1218          * the hash lock...?
 1219          */
 1220         inp->inp_flags |= INP_DROPPED;
 1221         if (inp->inp_flags & INP_INHASHLIST) {
 1222                 struct inpcbport *phd = inp->inp_phd;
 1223 
 1224                 INP_HASH_WLOCK(inp->inp_pcbinfo);
 1225                 LIST_REMOVE(inp, inp_hash);
 1226                 LIST_REMOVE(inp, inp_portlist);
 1227                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 1228                         LIST_REMOVE(phd, phd_hash);
 1229                         free(phd, M_PCB);
 1230                 }
 1231                 INP_HASH_WUNLOCK(inp->inp_pcbinfo);
 1232                 inp->inp_flags &= ~INP_INHASHLIST;
 1233 #ifdef PCBGROUP
 1234                 in_pcbgroup_remove(inp);
 1235 #endif
 1236         }
 1237 }
 1238 
 1239 #ifdef INET
 1240 /*
 1241  * Common routines to return the socket addresses associated with inpcbs.
 1242  */
 1243 struct sockaddr *
 1244 in_sockaddr(in_port_t port, struct in_addr *addr_p)
 1245 {
 1246         struct sockaddr_in *sin;
 1247 
 1248         sin = malloc(sizeof *sin, M_SONAME,
 1249                 M_WAITOK | M_ZERO);
 1250         sin->sin_family = AF_INET;
 1251         sin->sin_len = sizeof(*sin);
 1252         sin->sin_addr = *addr_p;
 1253         sin->sin_port = port;
 1254 
 1255         return (struct sockaddr *)sin;
 1256 }
 1257 
 1258 int
 1259 in_getsockaddr(struct socket *so, struct sockaddr **nam)
 1260 {
 1261         struct inpcb *inp;
 1262         struct in_addr addr;
 1263         in_port_t port;
 1264 
 1265         inp = sotoinpcb(so);
 1266         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
 1267 
 1268         INP_RLOCK(inp);
 1269         port = inp->inp_lport;
 1270         addr = inp->inp_laddr;
 1271         INP_RUNLOCK(inp);
 1272 
 1273         *nam = in_sockaddr(port, &addr);
 1274         return 0;
 1275 }
 1276 
 1277 int
 1278 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
 1279 {
 1280         struct inpcb *inp;
 1281         struct in_addr addr;
 1282         in_port_t port;
 1283 
 1284         inp = sotoinpcb(so);
 1285         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
 1286 
 1287         INP_RLOCK(inp);
 1288         port = inp->inp_fport;
 1289         addr = inp->inp_faddr;
 1290         INP_RUNLOCK(inp);
 1291 
 1292         *nam = in_sockaddr(port, &addr);
 1293         return 0;
 1294 }
 1295 
 1296 void
 1297 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
 1298     struct inpcb *(*notify)(struct inpcb *, int))
 1299 {
 1300         struct inpcb *inp, *inp_temp;
 1301 
 1302         INP_INFO_WLOCK(pcbinfo);
 1303         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
 1304                 INP_WLOCK(inp);
 1305 #ifdef INET6
 1306                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 1307                         INP_WUNLOCK(inp);
 1308                         continue;
 1309                 }
 1310 #endif
 1311                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 1312                     inp->inp_socket == NULL) {
 1313                         INP_WUNLOCK(inp);
 1314                         continue;
 1315                 }
 1316                 if ((*notify)(inp, errno))
 1317                         INP_WUNLOCK(inp);
 1318         }
 1319         INP_INFO_WUNLOCK(pcbinfo);
 1320 }
 1321 
 1322 void
 1323 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 1324 {
 1325         struct inpcb *inp;
 1326         struct ip_moptions *imo;
 1327         int i, gap;
 1328 
 1329         INP_INFO_RLOCK(pcbinfo);
 1330         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
 1331                 INP_WLOCK(inp);
 1332                 imo = inp->inp_moptions;
 1333                 if ((inp->inp_vflag & INP_IPV4) &&
 1334                     imo != NULL) {
 1335                         /*
 1336                          * Unselect the outgoing interface if it is being
 1337                          * detached.
 1338                          */
 1339                         if (imo->imo_multicast_ifp == ifp)
 1340                                 imo->imo_multicast_ifp = NULL;
 1341 
 1342                         /*
 1343                          * Drop multicast group membership if we joined
 1344                          * through the interface being detached.
 1345                          */
 1346                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 1347                             i++) {
 1348                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 1349                                         in_delmulti(imo->imo_membership[i]);
 1350                                         gap++;
 1351                                 } else if (gap != 0)
 1352                                         imo->imo_membership[i - gap] =
 1353                                             imo->imo_membership[i];
 1354                         }
 1355                         imo->imo_num_memberships -= gap;
 1356                 }
 1357                 INP_WUNLOCK(inp);
 1358         }
 1359         INP_INFO_RUNLOCK(pcbinfo);
 1360 }
 1361 
 1362 /*
 1363  * Lookup a PCB based on the local address and port.  Caller must hold the
 1364  * hash lock.  No inpcb locks or references are acquired.
 1365  */
 1366 #define INP_LOOKUP_MAPPED_PCB_COST      3
 1367 struct inpcb *
 1368 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 1369     u_short lport, int lookupflags, struct ucred *cred)
 1370 {
 1371         struct inpcb *inp;
 1372 #ifdef INET6
 1373         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
 1374 #else
 1375         int matchwild = 3;
 1376 #endif
 1377         int wildcard;
 1378 
 1379         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
 1380             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1381 
 1382         INP_HASH_LOCK_ASSERT(pcbinfo);
 1383 
 1384         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
 1385                 struct inpcbhead *head;
 1386                 /*
 1387                  * Look for an unconnected (wildcard foreign addr) PCB that
 1388                  * matches the local address and port we're looking for.
 1389                  */
 1390                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 1391                     0, pcbinfo->ipi_hashmask)];
 1392                 LIST_FOREACH(inp, head, inp_hash) {
 1393 #ifdef INET6
 1394                         /* XXX inp locking */
 1395                         if ((inp->inp_vflag & INP_IPV4) == 0)
 1396                                 continue;
 1397 #endif
 1398                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 1399                             inp->inp_laddr.s_addr == laddr.s_addr &&
 1400                             inp->inp_lport == lport) {
 1401                                 /*
 1402                                  * Found?
 1403                                  */
 1404                                 if (cred == NULL ||
 1405                                     prison_equal_ip4(cred->cr_prison,
 1406                                         inp->inp_cred->cr_prison))
 1407                                         return (inp);
 1408                         }
 1409                 }
 1410                 /*
 1411                  * Not found.
 1412                  */
 1413                 return (NULL);
 1414         } else {
 1415                 struct inpcbporthead *porthash;
 1416                 struct inpcbport *phd;
 1417                 struct inpcb *match = NULL;
 1418                 /*
 1419                  * Best fit PCB lookup.
 1420                  *
 1421                  * First see if this local port is in use by looking on the
 1422                  * port hash list.
 1423                  */
 1424                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 1425                     pcbinfo->ipi_porthashmask)];
 1426                 LIST_FOREACH(phd, porthash, phd_hash) {
 1427                         if (phd->phd_port == lport)
 1428                                 break;
 1429                 }
 1430                 if (phd != NULL) {
 1431                         /*
 1432                          * Port is in use by one or more PCBs. Look for best
 1433                          * fit.
 1434                          */
 1435                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 1436                                 wildcard = 0;
 1437                                 if (cred != NULL &&
 1438                                     !prison_equal_ip4(inp->inp_cred->cr_prison,
 1439                                         cred->cr_prison))
 1440                                         continue;
 1441 #ifdef INET6
 1442                                 /* XXX inp locking */
 1443                                 if ((inp->inp_vflag & INP_IPV4) == 0)
 1444                                         continue;
 1445                                 /*
 1446                                  * We never select the PCB that has
 1447                                  * INP_IPV6 flag and is bound to :: if
 1448                                  * we have another PCB which is bound
 1449                                  * to 0.0.0.0.  If a PCB has the
 1450                                  * INP_IPV6 flag, then we set its cost
 1451                                  * higher than IPv4 only PCBs.
 1452                                  *
 1453                                  * Note that the case only happens
 1454                                  * when a socket is bound to ::, under
 1455                                  * the condition that the use of the
 1456                                  * mapped address is allowed.
 1457                                  */
 1458                                 if ((inp->inp_vflag & INP_IPV6) != 0)
 1459                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
 1460 #endif
 1461                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
 1462                                         wildcard++;
 1463                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
 1464                                         if (laddr.s_addr == INADDR_ANY)
 1465                                                 wildcard++;
 1466                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
 1467                                                 continue;
 1468                                 } else {
 1469                                         if (laddr.s_addr != INADDR_ANY)
 1470                                                 wildcard++;
 1471                                 }
 1472                                 if (wildcard < matchwild) {
 1473                                         match = inp;
 1474                                         matchwild = wildcard;
 1475                                         if (matchwild == 0)
 1476                                                 break;
 1477                                 }
 1478                         }
 1479                 }
 1480                 return (match);
 1481         }
 1482 }
 1483 #undef INP_LOOKUP_MAPPED_PCB_COST
 1484 
 1485 #ifdef PCBGROUP
 1486 /*
 1487  * Lookup PCB in hash list, using pcbgroup tables.
 1488  */
 1489 static struct inpcb *
 1490 in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
 1491     struct in_addr faddr, u_int fport_arg, struct in_addr laddr,
 1492     u_int lport_arg, int lookupflags, struct ifnet *ifp)
 1493 {
 1494         struct inpcbhead *head;
 1495         struct inpcb *inp, *tmpinp;
 1496         u_short fport = fport_arg, lport = lport_arg;
 1497 
 1498         /*
 1499          * First look for an exact match.
 1500          */
 1501         tmpinp = NULL;
 1502         INP_GROUP_LOCK(pcbgroup);
 1503         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
 1504             pcbgroup->ipg_hashmask)];
 1505         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
 1506 #ifdef INET6
 1507                 /* XXX inp locking */
 1508                 if ((inp->inp_vflag & INP_IPV4) == 0)
 1509                         continue;
 1510 #endif
 1511                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
 1512                     inp->inp_laddr.s_addr == laddr.s_addr &&
 1513                     inp->inp_fport == fport &&
 1514                     inp->inp_lport == lport) {
 1515                         /*
 1516                          * XXX We should be able to directly return
 1517                          * the inp here, without any checks.
 1518                          * Well unless both bound with SO_REUSEPORT?
 1519                          */
 1520                         if (prison_flag(inp->inp_cred, PR_IP4))
 1521                                 goto found;
 1522                         if (tmpinp == NULL)
 1523                                 tmpinp = inp;
 1524                 }
 1525         }
 1526         if (tmpinp != NULL) {
 1527                 inp = tmpinp;
 1528                 goto found;
 1529         }
 1530 
 1531         /*
 1532          * Then look for a wildcard match, if requested.
 1533          */
 1534         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 1535                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 1536 #ifdef INET6
 1537                 struct inpcb *local_wild_mapped = NULL;
 1538 #endif
 1539                 struct inpcb *jail_wild = NULL;
 1540                 struct inpcbhead *head;
 1541                 int injail;
 1542 
 1543                 /*
 1544                  * Order of socket selection - we always prefer jails.
 1545                  *      1. jailed, non-wild.
 1546                  *      2. jailed, wild.
 1547                  *      3. non-jailed, non-wild.
 1548                  *      4. non-jailed, wild.
 1549                  */
 1550                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
 1551                     0, pcbinfo->ipi_wildmask)];
 1552                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
 1553 #ifdef INET6
 1554                         /* XXX inp locking */
 1555                         if ((inp->inp_vflag & INP_IPV4) == 0)
 1556                                 continue;
 1557 #endif
 1558                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
 1559                             inp->inp_lport != lport)
 1560                                 continue;
 1561 
 1562                         /* XXX inp locking */
 1563                         if (ifp && ifp->if_type == IFT_FAITH &&
 1564                             (inp->inp_flags & INP_FAITH) == 0)
 1565                                 continue;
 1566 
 1567                         injail = prison_flag(inp->inp_cred, PR_IP4);
 1568                         if (injail) {
 1569                                 if (prison_check_ip4(inp->inp_cred,
 1570                                     &laddr) != 0)
 1571                                         continue;
 1572                         } else {
 1573                                 if (local_exact != NULL)
 1574                                         continue;
 1575                         }
 1576 
 1577                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
 1578                                 if (injail)
 1579                                         goto found;
 1580                                 else
 1581                                         local_exact = inp;
 1582                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
 1583 #ifdef INET6
 1584                                 /* XXX inp locking, NULL check */
 1585                                 if (inp->inp_vflag & INP_IPV6PROTO)
 1586                                         local_wild_mapped = inp;
 1587                                 else
 1588 #endif /* INET6 */
 1589                                         if (injail)
 1590                                                 jail_wild = inp;
 1591                                         else
 1592                                                 local_wild = inp;
 1593                         }
 1594                 } /* LIST_FOREACH */
 1595                 inp = jail_wild;
 1596                 if (inp == NULL)
 1597                         inp = local_exact;
 1598                 if (inp == NULL)
 1599                         inp = local_wild;
 1600 #ifdef INET6
 1601                 if (inp == NULL)
 1602                         inp = local_wild_mapped;
 1603 #endif /* defined(INET6) */
 1604                 if (inp != NULL)
 1605                         goto found;
 1606         } /* if (lookupflags & INPLOOKUP_WILDCARD) */
 1607         INP_GROUP_UNLOCK(pcbgroup);
 1608         return (NULL);
 1609 
 1610 found:
 1611         in_pcbref(inp);
 1612         INP_GROUP_UNLOCK(pcbgroup);
 1613         if (lookupflags & INPLOOKUP_WLOCKPCB) {
 1614                 INP_WLOCK(inp);
 1615                 if (in_pcbrele_wlocked(inp))
 1616                         return (NULL);
 1617         } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
 1618                 INP_RLOCK(inp);
 1619                 if (in_pcbrele_rlocked(inp))
 1620                         return (NULL);
 1621         } else
 1622                 panic("%s: locking bug", __func__);
 1623         return (inp);
 1624 }
 1625 #endif /* PCBGROUP */
 1626 
 1627 /*
 1628  * Lookup PCB in hash list, using pcbinfo tables.  This variation assumes
 1629  * that the caller has locked the hash list, and will not perform any further
 1630  * locking or reference operations on either the hash list or the connection.
 1631  */
 1632 static struct inpcb *
 1633 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr,
 1634     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags,
 1635     struct ifnet *ifp)
 1636 {
 1637         struct inpcbhead *head;
 1638         struct inpcb *inp, *tmpinp;
 1639         u_short fport = fport_arg, lport = lport_arg;
 1640 
 1641         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
 1642             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1643 
 1644         INP_HASH_LOCK_ASSERT(pcbinfo);
 1645 
 1646         /*
 1647          * First look for an exact match.
 1648          */
 1649         tmpinp = NULL;
 1650         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
 1651             pcbinfo->ipi_hashmask)];
 1652         LIST_FOREACH(inp, head, inp_hash) {
 1653 #ifdef INET6
 1654                 /* XXX inp locking */
 1655                 if ((inp->inp_vflag & INP_IPV4) == 0)
 1656                         continue;
 1657 #endif
 1658                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
 1659                     inp->inp_laddr.s_addr == laddr.s_addr &&
 1660                     inp->inp_fport == fport &&
 1661                     inp->inp_lport == lport) {
 1662                         /*
 1663                          * XXX We should be able to directly return
 1664                          * the inp here, without any checks.
 1665                          * Well unless both bound with SO_REUSEPORT?
 1666                          */
 1667                         if (prison_flag(inp->inp_cred, PR_IP4))
 1668                                 return (inp);
 1669                         if (tmpinp == NULL)
 1670                                 tmpinp = inp;
 1671                 }
 1672         }
 1673         if (tmpinp != NULL)
 1674                 return (tmpinp);
 1675 
 1676         /*
 1677          * Then look for a wildcard match, if requested.
 1678          */
 1679         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 1680                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 1681 #ifdef INET6
 1682                 struct inpcb *local_wild_mapped = NULL;
 1683 #endif
 1684                 struct inpcb *jail_wild = NULL;
 1685                 int injail;
 1686 
 1687                 /*
 1688                  * Order of socket selection - we always prefer jails.
 1689                  *      1. jailed, non-wild.
 1690                  *      2. jailed, wild.
 1691                  *      3. non-jailed, non-wild.
 1692                  *      4. non-jailed, wild.
 1693                  */
 1694 
 1695                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 1696                     0, pcbinfo->ipi_hashmask)];
 1697                 LIST_FOREACH(inp, head, inp_hash) {
 1698 #ifdef INET6
 1699                         /* XXX inp locking */
 1700                         if ((inp->inp_vflag & INP_IPV4) == 0)
 1701                                 continue;
 1702 #endif
 1703                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
 1704                             inp->inp_lport != lport)
 1705                                 continue;
 1706 
 1707                         /* XXX inp locking */
 1708                         if (ifp && ifp->if_type == IFT_FAITH &&
 1709                             (inp->inp_flags & INP_FAITH) == 0)
 1710                                 continue;
 1711 
 1712                         injail = prison_flag(inp->inp_cred, PR_IP4);
 1713                         if (injail) {
 1714                                 if (prison_check_ip4(inp->inp_cred,
 1715                                     &laddr) != 0)
 1716                                         continue;
 1717                         } else {
 1718                                 if (local_exact != NULL)
 1719                                         continue;
 1720                         }
 1721 
 1722                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
 1723                                 if (injail)
 1724                                         return (inp);
 1725                                 else
 1726                                         local_exact = inp;
 1727                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
 1728 #ifdef INET6
 1729                                 /* XXX inp locking, NULL check */
 1730                                 if (inp->inp_vflag & INP_IPV6PROTO)
 1731                                         local_wild_mapped = inp;
 1732                                 else
 1733 #endif /* INET6 */
 1734                                         if (injail)
 1735                                                 jail_wild = inp;
 1736                                         else
 1737                                                 local_wild = inp;
 1738                         }
 1739                 } /* LIST_FOREACH */
 1740                 if (jail_wild != NULL)
 1741                         return (jail_wild);
 1742                 if (local_exact != NULL)
 1743                         return (local_exact);
 1744                 if (local_wild != NULL)
 1745                         return (local_wild);
 1746 #ifdef INET6
 1747                 if (local_wild_mapped != NULL)
 1748                         return (local_wild_mapped);
 1749 #endif /* defined(INET6) */
 1750         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
 1751 
 1752         return (NULL);
 1753 }
 1754 
 1755 /*
 1756  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
 1757  * hash list lock, and will return the inpcb locked (i.e., requires
 1758  * INPLOOKUP_LOCKPCB).
 1759  */
 1760 static struct inpcb *
 1761 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
 1762     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
 1763     struct ifnet *ifp)
 1764 {
 1765         struct inpcb *inp;
 1766 
 1767         INP_HASH_RLOCK(pcbinfo);
 1768         inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
 1769             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
 1770         if (inp != NULL) {
 1771                 in_pcbref(inp);
 1772                 INP_HASH_RUNLOCK(pcbinfo);
 1773                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
 1774                         INP_WLOCK(inp);
 1775                         if (in_pcbrele_wlocked(inp))
 1776                                 return (NULL);
 1777                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
 1778                         INP_RLOCK(inp);
 1779                         if (in_pcbrele_rlocked(inp))
 1780                                 return (NULL);
 1781                 } else
 1782                         panic("%s: locking bug", __func__);
 1783         } else
 1784                 INP_HASH_RUNLOCK(pcbinfo);
 1785         return (inp);
 1786 }
 1787 
 1788 /*
 1789  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
 1790  * from which a pre-calculated hash value may be extracted.
 1791  *
 1792  * Possibly more of this logic should be in in_pcbgroup.c.
 1793  */
 1794 struct inpcb *
 1795 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport,
 1796     struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp)
 1797 {
 1798 #if defined(PCBGROUP)
 1799         struct inpcbgroup *pcbgroup;
 1800 #endif
 1801 
 1802         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
 1803             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1804         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
 1805             ("%s: LOCKPCB not set", __func__));
 1806 
 1807 #if defined(PCBGROUP)
 1808         if (in_pcbgroup_enabled(pcbinfo)) {
 1809                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
 1810                     fport);
 1811                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
 1812                     laddr, lport, lookupflags, ifp));
 1813         }
 1814 #endif
 1815         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
 1816             lookupflags, ifp));
 1817 }
 1818 
 1819 struct inpcb *
 1820 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr,
 1821     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
 1822     struct ifnet *ifp, struct mbuf *m)
 1823 {
 1824 #ifdef PCBGROUP
 1825         struct inpcbgroup *pcbgroup;
 1826 #endif
 1827 
 1828         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
 1829             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1830         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
 1831             ("%s: LOCKPCB not set", __func__));
 1832 
 1833 #ifdef PCBGROUP
 1834         if (in_pcbgroup_enabled(pcbinfo)) {
 1835                 pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
 1836                     m->m_pkthdr.flowid);
 1837                 if (pcbgroup != NULL)
 1838                         return (in_pcblookup_group(pcbinfo, pcbgroup, faddr,
 1839                             fport, laddr, lport, lookupflags, ifp));
 1840                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
 1841                     fport);
 1842                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
 1843                     laddr, lport, lookupflags, ifp));
 1844         }
 1845 #endif
 1846         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
 1847             lookupflags, ifp));
 1848 }
 1849 #endif /* INET */
 1850 
 1851 /*
 1852  * Insert PCB onto various hash lists.
 1853  */
 1854 static int
 1855 in_pcbinshash_internal(struct inpcb *inp, int do_pcbgroup_update)
 1856 {
 1857         struct inpcbhead *pcbhash;
 1858         struct inpcbporthead *pcbporthash;
 1859         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 1860         struct inpcbport *phd;
 1861         u_int32_t hashkey_faddr;
 1862 
 1863         INP_WLOCK_ASSERT(inp);
 1864         INP_HASH_WLOCK_ASSERT(pcbinfo);
 1865 
 1866         KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
 1867             ("in_pcbinshash: INP_INHASHLIST"));
 1868 
 1869 #ifdef INET6
 1870         if (inp->inp_vflag & INP_IPV6)
 1871                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
 1872         else
 1873 #endif /* INET6 */
 1874         hashkey_faddr = inp->inp_faddr.s_addr;
 1875 
 1876         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
 1877                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
 1878 
 1879         pcbporthash = &pcbinfo->ipi_porthashbase[
 1880             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
 1881 
 1882         /*
 1883          * Go through port list and look for a head for this lport.
 1884          */
 1885         LIST_FOREACH(phd, pcbporthash, phd_hash) {
 1886                 if (phd->phd_port == inp->inp_lport)
 1887                         break;
 1888         }
 1889         /*
 1890          * If none exists, malloc one and tack it on.
 1891          */
 1892         if (phd == NULL) {
 1893                 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
 1894                 if (phd == NULL) {
 1895                         return (ENOBUFS); /* XXX */
 1896                 }
 1897                 phd->phd_port = inp->inp_lport;
 1898                 LIST_INIT(&phd->phd_pcblist);
 1899                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
 1900         }
 1901         inp->inp_phd = phd;
 1902         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
 1903         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
 1904         inp->inp_flags |= INP_INHASHLIST;
 1905 #ifdef PCBGROUP
 1906         if (do_pcbgroup_update)
 1907                 in_pcbgroup_update(inp);
 1908 #endif
 1909         return (0);
 1910 }
 1911 
 1912 /*
 1913  * For now, there are two public interfaces to insert an inpcb into the hash
 1914  * lists -- one that does update pcbgroups, and one that doesn't.  The latter
 1915  * is used only in the TCP syncache, where in_pcbinshash is called before the
 1916  * full 4-tuple is set for the inpcb, and we don't want to install in the
 1917  * pcbgroup until later.
 1918  *
 1919  * XXXRW: This seems like a misfeature.  in_pcbinshash should always update
 1920  * connection groups, and partially initialised inpcbs should not be exposed
 1921  * to either reservation hash tables or pcbgroups.
 1922  */
 1923 int
 1924 in_pcbinshash(struct inpcb *inp)
 1925 {
 1926 
 1927         return (in_pcbinshash_internal(inp, 1));
 1928 }
 1929 
 1930 int
 1931 in_pcbinshash_nopcbgroup(struct inpcb *inp)
 1932 {
 1933 
 1934         return (in_pcbinshash_internal(inp, 0));
 1935 }
 1936 
 1937 /*
 1938  * Move PCB to the proper hash bucket when { faddr, fport } have  been
 1939  * changed. NOTE: This does not handle the case of the lport changing (the
 1940  * hashed port list would have to be updated as well), so the lport must
 1941  * not change after in_pcbinshash() has been called.
 1942  */
 1943 void
 1944 in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m)
 1945 {
 1946         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 1947         struct inpcbhead *head;
 1948         u_int32_t hashkey_faddr;
 1949 
 1950         INP_WLOCK_ASSERT(inp);
 1951         INP_HASH_WLOCK_ASSERT(pcbinfo);
 1952 
 1953         KASSERT(inp->inp_flags & INP_INHASHLIST,
 1954             ("in_pcbrehash: !INP_INHASHLIST"));
 1955 
 1956 #ifdef INET6
 1957         if (inp->inp_vflag & INP_IPV6)
 1958                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
 1959         else
 1960 #endif /* INET6 */
 1961         hashkey_faddr = inp->inp_faddr.s_addr;
 1962 
 1963         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
 1964                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
 1965 
 1966         LIST_REMOVE(inp, inp_hash);
 1967         LIST_INSERT_HEAD(head, inp, inp_hash);
 1968 
 1969 #ifdef PCBGROUP
 1970         if (m != NULL)
 1971                 in_pcbgroup_update_mbuf(inp, m);
 1972         else
 1973                 in_pcbgroup_update(inp);
 1974 #endif
 1975 }
 1976 
 1977 void
 1978 in_pcbrehash(struct inpcb *inp)
 1979 {
 1980 
 1981         in_pcbrehash_mbuf(inp, NULL);
 1982 }
 1983 
 1984 /*
 1985  * Remove PCB from various lists.
 1986  */
 1987 static void
 1988 in_pcbremlists(struct inpcb *inp)
 1989 {
 1990         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 1991 
 1992         INP_INFO_WLOCK_ASSERT(pcbinfo);
 1993         INP_WLOCK_ASSERT(inp);
 1994 
 1995         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 1996         if (inp->inp_flags & INP_INHASHLIST) {
 1997                 struct inpcbport *phd = inp->inp_phd;
 1998 
 1999                 INP_HASH_WLOCK(pcbinfo);
 2000                 LIST_REMOVE(inp, inp_hash);
 2001                 LIST_REMOVE(inp, inp_portlist);
 2002                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 2003                         LIST_REMOVE(phd, phd_hash);
 2004                         free(phd, M_PCB);
 2005                 }
 2006                 INP_HASH_WUNLOCK(pcbinfo);
 2007                 inp->inp_flags &= ~INP_INHASHLIST;
 2008         }
 2009         LIST_REMOVE(inp, inp_list);
 2010         pcbinfo->ipi_count--;
 2011 #ifdef PCBGROUP
 2012         in_pcbgroup_remove(inp);
 2013 #endif
 2014 }
 2015 
 2016 /*
 2017  * A set label operation has occurred at the socket layer, propagate the
 2018  * label change into the in_pcb for the socket.
 2019  */
 2020 void
 2021 in_pcbsosetlabel(struct socket *so)
 2022 {
 2023 #ifdef MAC
 2024         struct inpcb *inp;
 2025 
 2026         inp = sotoinpcb(so);
 2027         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
 2028 
 2029         INP_WLOCK(inp);
 2030         SOCK_LOCK(so);
 2031         mac_inpcb_sosetlabel(so, inp);
 2032         SOCK_UNLOCK(so);
 2033         INP_WUNLOCK(inp);
 2034 #endif
 2035 }
 2036 
 2037 /*
 2038  * ipport_tick runs once per second, determining if random port allocation
 2039  * should be continued.  If more than ipport_randomcps ports have been
 2040  * allocated in the last second, then we return to sequential port
 2041  * allocation. We return to random allocation only once we drop below
 2042  * ipport_randomcps for at least ipport_randomtime seconds.
 2043  */
 2044 static void
 2045 ipport_tick(void *xtp)
 2046 {
 2047         VNET_ITERATOR_DECL(vnet_iter);
 2048 
 2049         VNET_LIST_RLOCK_NOSLEEP();
 2050         VNET_FOREACH(vnet_iter) {
 2051                 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
 2052                 if (V_ipport_tcpallocs <=
 2053                     V_ipport_tcplastcount + V_ipport_randomcps) {
 2054                         if (V_ipport_stoprandom > 0)
 2055                                 V_ipport_stoprandom--;
 2056                 } else
 2057                         V_ipport_stoprandom = V_ipport_randomtime;
 2058                 V_ipport_tcplastcount = V_ipport_tcpallocs;
 2059                 CURVNET_RESTORE();
 2060         }
 2061         VNET_LIST_RUNLOCK_NOSLEEP();
 2062         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
 2063 }
 2064 
 2065 static void
 2066 ip_fini(void *xtp)
 2067 {
 2068 
 2069         callout_stop(&ipport_tick_callout);
 2070 }
 2071 
 2072 /* 
 2073  * The ipport_callout should start running at about the time we attach the
 2074  * inet or inet6 domains.
 2075  */
 2076 static void
 2077 ipport_tick_init(const void *unused __unused)
 2078 {
 2079 
 2080         /* Start ipport_tick. */
 2081         callout_init(&ipport_tick_callout, CALLOUT_MPSAFE);
 2082         callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL);
 2083         EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL,
 2084                 SHUTDOWN_PRI_DEFAULT);
 2085 }
 2086 SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 
 2087     ipport_tick_init, NULL);
 2088 
 2089 void
 2090 inp_wlock(struct inpcb *inp)
 2091 {
 2092 
 2093         INP_WLOCK(inp);
 2094 }
 2095 
 2096 void
 2097 inp_wunlock(struct inpcb *inp)
 2098 {
 2099 
 2100         INP_WUNLOCK(inp);
 2101 }
 2102 
 2103 void
 2104 inp_rlock(struct inpcb *inp)
 2105 {
 2106 
 2107         INP_RLOCK(inp);
 2108 }
 2109 
 2110 void
 2111 inp_runlock(struct inpcb *inp)
 2112 {
 2113 
 2114         INP_RUNLOCK(inp);
 2115 }
 2116 
 2117 #ifdef INVARIANTS
 2118 void
 2119 inp_lock_assert(struct inpcb *inp)
 2120 {
 2121 
 2122         INP_WLOCK_ASSERT(inp);
 2123 }
 2124 
 2125 void
 2126 inp_unlock_assert(struct inpcb *inp)
 2127 {
 2128 
 2129         INP_UNLOCK_ASSERT(inp);
 2130 }
 2131 #endif
 2132 
 2133 void
 2134 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
 2135 {
 2136         struct inpcb *inp;
 2137 
 2138         INP_INFO_RLOCK(&V_tcbinfo);
 2139         LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
 2140                 INP_WLOCK(inp);
 2141                 func(inp, arg);
 2142                 INP_WUNLOCK(inp);
 2143         }
 2144         INP_INFO_RUNLOCK(&V_tcbinfo);
 2145 }
 2146 
 2147 struct socket *
 2148 inp_inpcbtosocket(struct inpcb *inp)
 2149 {
 2150 
 2151         INP_WLOCK_ASSERT(inp);
 2152         return (inp->inp_socket);
 2153 }
 2154 
 2155 struct tcpcb *
 2156 inp_inpcbtotcpcb(struct inpcb *inp)
 2157 {
 2158 
 2159         INP_WLOCK_ASSERT(inp);
 2160         return ((struct tcpcb *)inp->inp_ppcb);
 2161 }
 2162 
 2163 int
 2164 inp_ip_tos_get(const struct inpcb *inp)
 2165 {
 2166 
 2167         return (inp->inp_ip_tos);
 2168 }
 2169 
 2170 void
 2171 inp_ip_tos_set(struct inpcb *inp, int val)
 2172 {
 2173 
 2174         inp->inp_ip_tos = val;
 2175 }
 2176 
 2177 void
 2178 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
 2179     uint32_t *faddr, uint16_t *fp)
 2180 {
 2181 
 2182         INP_LOCK_ASSERT(inp);
 2183         *laddr = inp->inp_laddr.s_addr;
 2184         *faddr = inp->inp_faddr.s_addr;
 2185         *lp = inp->inp_lport;
 2186         *fp = inp->inp_fport;
 2187 }
 2188 
 2189 struct inpcb *
 2190 so_sotoinpcb(struct socket *so)
 2191 {
 2192 
 2193         return (sotoinpcb(so));
 2194 }
 2195 
 2196 struct tcpcb *
 2197 so_sototcpcb(struct socket *so)
 2198 {
 2199 
 2200         return (sototcpcb(so));
 2201 }
 2202 
 2203 #ifdef DDB
 2204 static void
 2205 db_print_indent(int indent)
 2206 {
 2207         int i;
 2208 
 2209         for (i = 0; i < indent; i++)
 2210                 db_printf(" ");
 2211 }
 2212 
 2213 static void
 2214 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
 2215 {
 2216         char faddr_str[48], laddr_str[48];
 2217 
 2218         db_print_indent(indent);
 2219         db_printf("%s at %p\n", name, inc);
 2220 
 2221         indent += 2;
 2222 
 2223 #ifdef INET6
 2224         if (inc->inc_flags & INC_ISIPV6) {
 2225                 /* IPv6. */
 2226                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
 2227                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
 2228         } else {
 2229 #endif
 2230                 /* IPv4. */
 2231                 inet_ntoa_r(inc->inc_laddr, laddr_str);
 2232                 inet_ntoa_r(inc->inc_faddr, faddr_str);
 2233 #ifdef INET6
 2234         }
 2235 #endif
 2236         db_print_indent(indent);
 2237         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
 2238             ntohs(inc->inc_lport));
 2239         db_print_indent(indent);
 2240         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
 2241             ntohs(inc->inc_fport));
 2242 }
 2243 
 2244 static void
 2245 db_print_inpflags(int inp_flags)
 2246 {
 2247         int comma;
 2248 
 2249         comma = 0;
 2250         if (inp_flags & INP_RECVOPTS) {
 2251                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
 2252                 comma = 1;
 2253         }
 2254         if (inp_flags & INP_RECVRETOPTS) {
 2255                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
 2256                 comma = 1;
 2257         }
 2258         if (inp_flags & INP_RECVDSTADDR) {
 2259                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
 2260                 comma = 1;
 2261         }
 2262         if (inp_flags & INP_HDRINCL) {
 2263                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
 2264                 comma = 1;
 2265         }
 2266         if (inp_flags & INP_HIGHPORT) {
 2267                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
 2268                 comma = 1;
 2269         }
 2270         if (inp_flags & INP_LOWPORT) {
 2271                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
 2272                 comma = 1;
 2273         }
 2274         if (inp_flags & INP_ANONPORT) {
 2275                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
 2276                 comma = 1;
 2277         }
 2278         if (inp_flags & INP_RECVIF) {
 2279                 db_printf("%sINP_RECVIF", comma ? ", " : "");
 2280                 comma = 1;
 2281         }
 2282         if (inp_flags & INP_MTUDISC) {
 2283                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
 2284                 comma = 1;
 2285         }
 2286         if (inp_flags & INP_FAITH) {
 2287                 db_printf("%sINP_FAITH", comma ? ", " : "");
 2288                 comma = 1;
 2289         }
 2290         if (inp_flags & INP_RECVTTL) {
 2291                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
 2292                 comma = 1;
 2293         }
 2294         if (inp_flags & INP_DONTFRAG) {
 2295                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
 2296                 comma = 1;
 2297         }
 2298         if (inp_flags & IN6P_IPV6_V6ONLY) {
 2299                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
 2300                 comma = 1;
 2301         }
 2302         if (inp_flags & IN6P_PKTINFO) {
 2303                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
 2304                 comma = 1;
 2305         }
 2306         if (inp_flags & IN6P_HOPLIMIT) {
 2307                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
 2308                 comma = 1;
 2309         }
 2310         if (inp_flags & IN6P_HOPOPTS) {
 2311                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
 2312                 comma = 1;
 2313         }
 2314         if (inp_flags & IN6P_DSTOPTS) {
 2315                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
 2316                 comma = 1;
 2317         }
 2318         if (inp_flags & IN6P_RTHDR) {
 2319                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
 2320                 comma = 1;
 2321         }
 2322         if (inp_flags & IN6P_RTHDRDSTOPTS) {
 2323                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
 2324                 comma = 1;
 2325         }
 2326         if (inp_flags & IN6P_TCLASS) {
 2327                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
 2328                 comma = 1;
 2329         }
 2330         if (inp_flags & IN6P_AUTOFLOWLABEL) {
 2331                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
 2332                 comma = 1;
 2333         }
 2334         if (inp_flags & INP_TIMEWAIT) {
 2335                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
 2336                 comma  = 1;
 2337         }
 2338         if (inp_flags & INP_ONESBCAST) {
 2339                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
 2340                 comma  = 1;
 2341         }
 2342         if (inp_flags & INP_DROPPED) {
 2343                 db_printf("%sINP_DROPPED", comma ? ", " : "");
 2344                 comma  = 1;
 2345         }
 2346         if (inp_flags & INP_SOCKREF) {
 2347                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
 2348                 comma  = 1;
 2349         }
 2350         if (inp_flags & IN6P_RFC2292) {
 2351                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
 2352                 comma = 1;
 2353         }
 2354         if (inp_flags & IN6P_MTU) {
 2355                 db_printf("IN6P_MTU%s", comma ? ", " : "");
 2356                 comma = 1;
 2357         }
 2358 }
 2359 
 2360 static void
 2361 db_print_inpvflag(u_char inp_vflag)
 2362 {
 2363         int comma;
 2364 
 2365         comma = 0;
 2366         if (inp_vflag & INP_IPV4) {
 2367                 db_printf("%sINP_IPV4", comma ? ", " : "");
 2368                 comma  = 1;
 2369         }
 2370         if (inp_vflag & INP_IPV6) {
 2371                 db_printf("%sINP_IPV6", comma ? ", " : "");
 2372                 comma  = 1;
 2373         }
 2374         if (inp_vflag & INP_IPV6PROTO) {
 2375                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
 2376                 comma  = 1;
 2377         }
 2378 }
 2379 
 2380 static void
 2381 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
 2382 {
 2383 
 2384         db_print_indent(indent);
 2385         db_printf("%s at %p\n", name, inp);
 2386 
 2387         indent += 2;
 2388 
 2389         db_print_indent(indent);
 2390         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
 2391 
 2392         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
 2393 
 2394         db_print_indent(indent);
 2395         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
 2396             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
 2397 
 2398         db_print_indent(indent);
 2399         db_printf("inp_label: %p   inp_flags: 0x%x (",
 2400            inp->inp_label, inp->inp_flags);
 2401         db_print_inpflags(inp->inp_flags);
 2402         db_printf(")\n");
 2403 
 2404         db_print_indent(indent);
 2405         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
 2406             inp->inp_vflag);
 2407         db_print_inpvflag(inp->inp_vflag);
 2408         db_printf(")\n");
 2409 
 2410         db_print_indent(indent);
 2411         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
 2412             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
 2413 
 2414         db_print_indent(indent);
 2415 #ifdef INET6
 2416         if (inp->inp_vflag & INP_IPV6) {
 2417                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
 2418                     "in6p_moptions: %p\n", inp->in6p_options,
 2419                     inp->in6p_outputopts, inp->in6p_moptions);
 2420                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
 2421                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
 2422                     inp->in6p_hops);
 2423         } else
 2424 #endif
 2425         {
 2426                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
 2427                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
 2428                     inp->inp_options, inp->inp_moptions);
 2429         }
 2430 
 2431         db_print_indent(indent);
 2432         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
 2433             (uintmax_t)inp->inp_gencnt);
 2434 }
 2435 
 2436 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
 2437 {
 2438         struct inpcb *inp;
 2439 
 2440         if (!have_addr) {
 2441                 db_printf("usage: show inpcb <addr>\n");
 2442                 return;
 2443         }
 2444         inp = (struct inpcb *)addr;
 2445 
 2446         db_print_inpcb(inp, "inpcb", 0);
 2447 }
 2448 #endif

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