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/10.4/sys/netinet/in_pcb.c 314667 2017-03-04 13:03:31Z avg $");
   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         error = sysctl_handle_int(oidp, arg1, arg2, req);
  148         if (error == 0) {
  149                 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
  150                 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
  151                 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
  152                 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
  153                 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
  154                 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
  155         }
  156         return (error);
  157 }
  158 
  159 #undef RANGECHK
  160 
  161 static SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0,
  162     "IP Ports");
  163 
  164 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst,
  165         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowfirstauto), 0,
  166         &sysctl_net_ipport_check, "I", "");
  167 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast,
  168         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowlastauto), 0,
  169         &sysctl_net_ipport_check, "I", "");
  170 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, first,
  171         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_firstauto), 0,
  172         &sysctl_net_ipport_check, "I", "");
  173 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, last,
  174         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lastauto), 0,
  175         &sysctl_net_ipport_check, "I", "");
  176 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst,
  177         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hifirstauto), 0,
  178         &sysctl_net_ipport_check, "I", "");
  179 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hilast,
  180         CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hilastauto), 0,
  181         &sysctl_net_ipport_check, "I", "");
  182 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
  183         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedhigh), 0, "");
  184 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
  185         CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, "");
  186 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
  187         &VNET_NAME(ipport_randomized), 0, "Enable random port allocation");
  188 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
  189         &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port "
  190         "allocations before switching to a sequental one");
  191 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
  192         &VNET_NAME(ipport_randomtime), 0,
  193         "Minimum time to keep sequental port "
  194         "allocation before switching to a random one");
  195 #endif /* INET */
  196 
  197 /*
  198  * in_pcb.c: manage the Protocol Control Blocks.
  199  *
  200  * NOTE: It is assumed that most of these functions will be called with
  201  * the pcbinfo lock held, and often, the inpcb lock held, as these utility
  202  * functions often modify hash chains or addresses in pcbs.
  203  */
  204 
  205 /*
  206  * Initialize an inpcbinfo -- we should be able to reduce the number of
  207  * arguments in time.
  208  */
  209 void
  210 in_pcbinfo_init(struct inpcbinfo *pcbinfo, const char *name,
  211     struct inpcbhead *listhead, int hash_nelements, int porthash_nelements,
  212     char *inpcbzone_name, uma_init inpcbzone_init, uma_fini inpcbzone_fini,
  213     uint32_t inpcbzone_flags, u_int hashfields)
  214 {
  215 
  216         INP_INFO_LOCK_INIT(pcbinfo, name);
  217         INP_HASH_LOCK_INIT(pcbinfo, "pcbinfohash");     /* XXXRW: argument? */
  218         INP_LIST_LOCK_INIT(pcbinfo, "pcbinfolist");
  219 #ifdef VIMAGE
  220         pcbinfo->ipi_vnet = curvnet;
  221 #endif
  222         pcbinfo->ipi_listhead = listhead;
  223         LIST_INIT(pcbinfo->ipi_listhead);
  224         pcbinfo->ipi_count = 0;
  225         pcbinfo->ipi_hashbase = hashinit(hash_nelements, M_PCB,
  226             &pcbinfo->ipi_hashmask);
  227         pcbinfo->ipi_porthashbase = hashinit(porthash_nelements, M_PCB,
  228             &pcbinfo->ipi_porthashmask);
  229 #ifdef PCBGROUP
  230         in_pcbgroup_init(pcbinfo, hashfields, hash_nelements);
  231 #endif
  232         pcbinfo->ipi_zone = uma_zcreate(inpcbzone_name, sizeof(struct inpcb),
  233             NULL, NULL, inpcbzone_init, inpcbzone_fini, UMA_ALIGN_PTR,
  234             inpcbzone_flags);
  235         uma_zone_set_max(pcbinfo->ipi_zone, maxsockets);
  236         uma_zone_set_warning(pcbinfo->ipi_zone,
  237             "kern.ipc.maxsockets limit reached");
  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_LIST_LOCK_DESTROY(pcbinfo);
  258         INP_HASH_LOCK_DESTROY(pcbinfo);
  259         INP_INFO_LOCK_DESTROY(pcbinfo);
  260 }
  261 
  262 /*
  263  * Allocate a PCB and associate it with the socket.
  264  * On success return with the PCB locked.
  265  */
  266 int
  267 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
  268 {
  269         struct inpcb *inp;
  270         int error;
  271 
  272 #ifdef INVARIANTS
  273         if (pcbinfo == &V_tcbinfo) {
  274                 INP_INFO_RLOCK_ASSERT(pcbinfo);
  275         } else {
  276                 INP_INFO_WLOCK_ASSERT(pcbinfo);
  277         }
  278 #endif
  279 
  280         error = 0;
  281         inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
  282         if (inp == NULL)
  283                 return (ENOBUFS);
  284         bzero(inp, inp_zero_size);
  285         inp->inp_pcbinfo = pcbinfo;
  286         inp->inp_socket = so;
  287         inp->inp_cred = crhold(so->so_cred);
  288         inp->inp_inc.inc_fibnum = so->so_fibnum;
  289 #ifdef MAC
  290         error = mac_inpcb_init(inp, M_NOWAIT);
  291         if (error != 0)
  292                 goto out;
  293         mac_inpcb_create(so, inp);
  294 #endif
  295 #ifdef IPSEC
  296         error = ipsec_init_policy(so, &inp->inp_sp);
  297         if (error != 0) {
  298 #ifdef MAC
  299                 mac_inpcb_destroy(inp);
  300 #endif
  301                 goto out;
  302         }
  303 #endif /*IPSEC*/
  304 #ifdef INET6
  305         if (INP_SOCKAF(so) == AF_INET6) {
  306                 inp->inp_vflag |= INP_IPV6PROTO;
  307                 if (V_ip6_v6only)
  308                         inp->inp_flags |= IN6P_IPV6_V6ONLY;
  309         }
  310 #endif
  311         INP_WLOCK(inp);
  312         INP_LIST_WLOCK(pcbinfo);
  313         LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
  314         pcbinfo->ipi_count++;
  315         so->so_pcb = (caddr_t)inp;
  316 #ifdef INET6
  317         if (V_ip6_auto_flowlabel)
  318                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
  319 #endif
  320         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
  321         refcount_init(&inp->inp_refcount, 1);   /* Reference from inpcbinfo */
  322         INP_LIST_WUNLOCK(pcbinfo);
  323 #if defined(IPSEC) || defined(MAC)
  324 out:
  325         if (error != 0) {
  326                 crfree(inp->inp_cred);
  327                 uma_zfree(pcbinfo->ipi_zone, inp);
  328         }
  329 #endif
  330         return (error);
  331 }
  332 
  333 #ifdef INET
  334 int
  335 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
  336 {
  337         int anonport, error;
  338 
  339         INP_WLOCK_ASSERT(inp);
  340         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
  341 
  342         if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
  343                 return (EINVAL);
  344         anonport = nam == NULL || ((struct sockaddr_in *)nam)->sin_port == 0;
  345         error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
  346             &inp->inp_lport, cred);
  347         if (error)
  348                 return (error);
  349         if (in_pcbinshash(inp) != 0) {
  350                 inp->inp_laddr.s_addr = INADDR_ANY;
  351                 inp->inp_lport = 0;
  352                 return (EAGAIN);
  353         }
  354         if (anonport)
  355                 inp->inp_flags |= INP_ANONPORT;
  356         return (0);
  357 }
  358 #endif
  359 
  360 #if defined(INET) || defined(INET6)
  361 int
  362 in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp,
  363     struct ucred *cred, int lookupflags)
  364 {
  365         struct inpcbinfo *pcbinfo;
  366         struct inpcb *tmpinp;
  367         unsigned short *lastport;
  368         int count, dorandom, error;
  369         u_short aux, first, last, lport;
  370 #ifdef INET
  371         struct in_addr laddr;
  372 #endif
  373 
  374         pcbinfo = inp->inp_pcbinfo;
  375 
  376         /*
  377          * Because no actual state changes occur here, a global write lock on
  378          * the pcbinfo isn't required.
  379          */
  380         INP_LOCK_ASSERT(inp);
  381         INP_HASH_LOCK_ASSERT(pcbinfo);
  382 
  383         if (inp->inp_flags & INP_HIGHPORT) {
  384                 first = V_ipport_hifirstauto;   /* sysctl */
  385                 last  = V_ipport_hilastauto;
  386                 lastport = &pcbinfo->ipi_lasthi;
  387         } else if (inp->inp_flags & INP_LOWPORT) {
  388                 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
  389                 if (error)
  390                         return (error);
  391                 first = V_ipport_lowfirstauto;  /* 1023 */
  392                 last  = V_ipport_lowlastauto;   /* 600 */
  393                 lastport = &pcbinfo->ipi_lastlow;
  394         } else {
  395                 first = V_ipport_firstauto;     /* sysctl */
  396                 last  = V_ipport_lastauto;
  397                 lastport = &pcbinfo->ipi_lastport;
  398         }
  399         /*
  400          * For UDP(-Lite), use random port allocation as long as the user
  401          * allows it.  For TCP (and as of yet unknown) connections,
  402          * use random port allocation only if the user allows it AND
  403          * ipport_tick() allows it.
  404          */
  405         if (V_ipport_randomized &&
  406                 (!V_ipport_stoprandom || pcbinfo == &V_udbinfo ||
  407                 pcbinfo == &V_ulitecbinfo))
  408                 dorandom = 1;
  409         else
  410                 dorandom = 0;
  411         /*
  412          * It makes no sense to do random port allocation if
  413          * we have the only port available.
  414          */
  415         if (first == last)
  416                 dorandom = 0;
  417         /* Make sure to not include UDP(-Lite) packets in the count. */
  418         if (pcbinfo != &V_udbinfo || pcbinfo != &V_ulitecbinfo)
  419                 V_ipport_tcpallocs++;
  420         /*
  421          * Instead of having two loops further down counting up or down
  422          * make sure that first is always <= last and go with only one
  423          * code path implementing all logic.
  424          */
  425         if (first > last) {
  426                 aux = first;
  427                 first = last;
  428                 last = aux;
  429         }
  430 
  431 #ifdef INET
  432         /* Make the compiler happy. */
  433         laddr.s_addr = 0;
  434         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) {
  435                 KASSERT(laddrp != NULL, ("%s: laddrp NULL for v4 inp %p",
  436                     __func__, inp));
  437                 laddr = *laddrp;
  438         }
  439 #endif
  440         tmpinp = NULL;  /* Make compiler happy. */
  441         lport = *lportp;
  442 
  443         if (dorandom)
  444                 *lastport = first + (arc4random() % (last - first));
  445 
  446         count = last - first;
  447 
  448         do {
  449                 if (count-- < 0)        /* completely used? */
  450                         return (EADDRNOTAVAIL);
  451                 ++*lastport;
  452                 if (*lastport < first || *lastport > last)
  453                         *lastport = first;
  454                 lport = htons(*lastport);
  455 
  456 #ifdef INET6
  457                 if ((inp->inp_vflag & INP_IPV6) != 0)
  458                         tmpinp = in6_pcblookup_local(pcbinfo,
  459                             &inp->in6p_laddr, lport, lookupflags, cred);
  460 #endif
  461 #if defined(INET) && defined(INET6)
  462                 else
  463 #endif
  464 #ifdef INET
  465                         tmpinp = in_pcblookup_local(pcbinfo, laddr,
  466                             lport, lookupflags, cred);
  467 #endif
  468         } while (tmpinp != NULL);
  469 
  470 #ifdef INET
  471         if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4)
  472                 laddrp->s_addr = laddr.s_addr;
  473 #endif                 
  474         *lportp = lport;
  475 
  476         return (0);
  477 }
  478 
  479 /*
  480  * Return cached socket options.
  481  */
  482 short
  483 inp_so_options(const struct inpcb *inp)
  484 {
  485    short so_options;
  486 
  487    so_options = 0;
  488 
  489    if ((inp->inp_flags2 & INP_REUSEPORT) != 0)
  490            so_options |= SO_REUSEPORT;
  491    if ((inp->inp_flags2 & INP_REUSEADDR) != 0)
  492            so_options |= SO_REUSEADDR;
  493    return (so_options);
  494 }
  495 #endif /* INET || INET6 */
  496 
  497 #ifdef INET
  498 /*
  499  * Set up a bind operation on a PCB, performing port allocation
  500  * as required, but do not actually modify the PCB. Callers can
  501  * either complete the bind by setting inp_laddr/inp_lport and
  502  * calling in_pcbinshash(), or they can just use the resulting
  503  * port and address to authorise the sending of a once-off packet.
  504  *
  505  * On error, the values of *laddrp and *lportp are not changed.
  506  */
  507 int
  508 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
  509     u_short *lportp, struct ucred *cred)
  510 {
  511         struct socket *so = inp->inp_socket;
  512         struct sockaddr_in *sin;
  513         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
  514         struct in_addr laddr;
  515         u_short lport = 0;
  516         int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT);
  517         int error;
  518 
  519         /*
  520          * No state changes, so read locks are sufficient here.
  521          */
  522         INP_LOCK_ASSERT(inp);
  523         INP_HASH_LOCK_ASSERT(pcbinfo);
  524 
  525         if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
  526                 return (EADDRNOTAVAIL);
  527         laddr.s_addr = *laddrp;
  528         if (nam != NULL && laddr.s_addr != INADDR_ANY)
  529                 return (EINVAL);
  530         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
  531                 lookupflags = INPLOOKUP_WILDCARD;
  532         if (nam == NULL) {
  533                 if ((error = prison_local_ip4(cred, &laddr)) != 0)
  534                         return (error);
  535         } else {
  536                 sin = (struct sockaddr_in *)nam;
  537                 if (nam->sa_len != sizeof (*sin))
  538                         return (EINVAL);
  539 #ifdef notdef
  540                 /*
  541                  * We should check the family, but old programs
  542                  * incorrectly fail to initialize it.
  543                  */
  544                 if (sin->sin_family != AF_INET)
  545                         return (EAFNOSUPPORT);
  546 #endif
  547                 error = prison_local_ip4(cred, &sin->sin_addr);
  548                 if (error)
  549                         return (error);
  550                 if (sin->sin_port != *lportp) {
  551                         /* Don't allow the port to change. */
  552                         if (*lportp != 0)
  553                                 return (EINVAL);
  554                         lport = sin->sin_port;
  555                 }
  556                 /* NB: lport is left as 0 if the port isn't being changed. */
  557                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
  558                         /*
  559                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
  560                          * allow complete duplication of binding if
  561                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
  562                          * and a multicast address is bound on both
  563                          * new and duplicated sockets.
  564                          */
  565                         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
  566                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
  567                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
  568                         sin->sin_port = 0;              /* yech... */
  569                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  570                         /*
  571                          * Is the address a local IP address? 
  572                          * If INP_BINDANY is set, then the socket may be bound
  573                          * to any endpoint address, local or not.
  574                          */
  575                         if ((inp->inp_flags & INP_BINDANY) == 0 &&
  576                             ifa_ifwithaddr_check((struct sockaddr *)sin) == 0) 
  577                                 return (EADDRNOTAVAIL);
  578                 }
  579                 laddr = sin->sin_addr;
  580                 if (lport) {
  581                         struct inpcb *t;
  582                         struct tcptw *tw;
  583 
  584                         /* GROSS */
  585                         if (ntohs(lport) <= V_ipport_reservedhigh &&
  586                             ntohs(lport) >= V_ipport_reservedlow &&
  587                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
  588                             0))
  589                                 return (EACCES);
  590                         if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
  591                             priv_check_cred(inp->inp_cred,
  592                             PRIV_NETINET_REUSEPORT, 0) != 0) {
  593                                 t = in_pcblookup_local(pcbinfo, sin->sin_addr,
  594                                     lport, INPLOOKUP_WILDCARD, cred);
  595         /*
  596          * XXX
  597          * This entire block sorely needs a rewrite.
  598          */
  599                                 if (t &&
  600                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
  601                                     (so->so_type != SOCK_STREAM ||
  602                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
  603                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
  604                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
  605                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
  606                                     (inp->inp_cred->cr_uid !=
  607                                      t->inp_cred->cr_uid))
  608                                         return (EADDRINUSE);
  609                         }
  610                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
  611                             lport, lookupflags, cred);
  612                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
  613                                 /*
  614                                  * XXXRW: If an incpb has had its timewait
  615                                  * state recycled, we treat the address as
  616                                  * being in use (for now).  This is better
  617                                  * than a panic, but not desirable.
  618                                  */
  619                                 tw = intotw(t);
  620                                 if (tw == NULL ||
  621                                     (reuseport & tw->tw_so_options) == 0)
  622                                         return (EADDRINUSE);
  623                         } else if (t && (reuseport & inp_so_options(t)) == 0) {
  624 #ifdef INET6
  625                                 if (ntohl(sin->sin_addr.s_addr) !=
  626                                     INADDR_ANY ||
  627                                     ntohl(t->inp_laddr.s_addr) !=
  628                                     INADDR_ANY ||
  629                                     (inp->inp_vflag & INP_IPV6PROTO) == 0 ||
  630                                     (t->inp_vflag & INP_IPV6PROTO) == 0)
  631 #endif
  632                                 return (EADDRINUSE);
  633                         }
  634                 }
  635         }
  636         if (*lportp != 0)
  637                 lport = *lportp;
  638         if (lport == 0) {
  639                 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags);
  640                 if (error != 0)
  641                         return (error);
  642 
  643         }
  644         *laddrp = laddr.s_addr;
  645         *lportp = lport;
  646         return (0);
  647 }
  648 
  649 /*
  650  * Connect from a socket to a specified address.
  651  * Both address and port must be specified in argument sin.
  652  * If don't have a local address for this socket yet,
  653  * then pick one.
  654  */
  655 int
  656 in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
  657     struct ucred *cred, struct mbuf *m)
  658 {
  659         u_short lport, fport;
  660         in_addr_t laddr, faddr;
  661         int anonport, error;
  662 
  663         INP_WLOCK_ASSERT(inp);
  664         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
  665 
  666         lport = inp->inp_lport;
  667         laddr = inp->inp_laddr.s_addr;
  668         anonport = (lport == 0);
  669         error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
  670             NULL, cred);
  671         if (error)
  672                 return (error);
  673 
  674         /* Do the initial binding of the local address if required. */
  675         if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
  676                 inp->inp_lport = lport;
  677                 inp->inp_laddr.s_addr = laddr;
  678                 if (in_pcbinshash(inp) != 0) {
  679                         inp->inp_laddr.s_addr = INADDR_ANY;
  680                         inp->inp_lport = 0;
  681                         return (EAGAIN);
  682                 }
  683         }
  684 
  685         /* Commit the remaining changes. */
  686         inp->inp_lport = lport;
  687         inp->inp_laddr.s_addr = laddr;
  688         inp->inp_faddr.s_addr = faddr;
  689         inp->inp_fport = fport;
  690         in_pcbrehash_mbuf(inp, m);
  691 
  692         if (anonport)
  693                 inp->inp_flags |= INP_ANONPORT;
  694         return (0);
  695 }
  696 
  697 int
  698 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
  699 {
  700 
  701         return (in_pcbconnect_mbuf(inp, nam, cred, NULL));
  702 }
  703 
  704 /*
  705  * Do proper source address selection on an unbound socket in case
  706  * of connect. Take jails into account as well.
  707  */
  708 int
  709 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
  710     struct ucred *cred)
  711 {
  712         struct ifaddr *ifa;
  713         struct sockaddr *sa;
  714         struct sockaddr_in *sin;
  715         struct route sro;
  716         int error;
  717 
  718         KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
  719 
  720         /*
  721          * Bypass source address selection and use the primary jail IP
  722          * if requested.
  723          */
  724         if (cred != NULL && !prison_saddrsel_ip4(cred, laddr))
  725                 return (0);
  726 
  727         error = 0;
  728         bzero(&sro, sizeof(sro));
  729 
  730         sin = (struct sockaddr_in *)&sro.ro_dst;
  731         sin->sin_family = AF_INET;
  732         sin->sin_len = sizeof(struct sockaddr_in);
  733         sin->sin_addr.s_addr = faddr->s_addr;
  734 
  735         /*
  736          * If route is known our src addr is taken from the i/f,
  737          * else punt.
  738          *
  739          * Find out route to destination.
  740          */
  741         if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
  742                 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
  743 
  744         /*
  745          * If we found a route, use the address corresponding to
  746          * the outgoing interface.
  747          * 
  748          * Otherwise assume faddr is reachable on a directly connected
  749          * network and try to find a corresponding interface to take
  750          * the source address from.
  751          */
  752         if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
  753                 struct in_ifaddr *ia;
  754                 struct ifnet *ifp;
  755 
  756                 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin));
  757                 if (ia == NULL)
  758                         ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0));
  759                 if (ia == NULL) {
  760                         error = ENETUNREACH;
  761                         goto done;
  762                 }
  763 
  764                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
  765                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  766                         ifa_free(&ia->ia_ifa);
  767                         goto done;
  768                 }
  769 
  770                 ifp = ia->ia_ifp;
  771                 ifa_free(&ia->ia_ifa);
  772                 ia = NULL;
  773                 IF_ADDR_RLOCK(ifp);
  774                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  775 
  776                         sa = ifa->ifa_addr;
  777                         if (sa->sa_family != AF_INET)
  778                                 continue;
  779                         sin = (struct sockaddr_in *)sa;
  780                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
  781                                 ia = (struct in_ifaddr *)ifa;
  782                                 break;
  783                         }
  784                 }
  785                 if (ia != NULL) {
  786                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  787                         IF_ADDR_RUNLOCK(ifp);
  788                         goto done;
  789                 }
  790                 IF_ADDR_RUNLOCK(ifp);
  791 
  792                 /* 3. As a last resort return the 'default' jail address. */
  793                 error = prison_get_ip4(cred, laddr);
  794                 goto done;
  795         }
  796 
  797         /*
  798          * If the outgoing interface on the route found is not
  799          * a loopback interface, use the address from that interface.
  800          * In case of jails do those three steps:
  801          * 1. check if the interface address belongs to the jail. If so use it.
  802          * 2. check if we have any address on the outgoing interface
  803          *    belonging to this jail. If so use it.
  804          * 3. as a last resort return the 'default' jail address.
  805          */
  806         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
  807                 struct in_ifaddr *ia;
  808                 struct ifnet *ifp;
  809 
  810                 /* If not jailed, use the default returned. */
  811                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
  812                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
  813                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  814                         goto done;
  815                 }
  816 
  817                 /* Jailed. */
  818                 /* 1. Check if the iface address belongs to the jail. */
  819                 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
  820                 if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
  821                         ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
  822                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  823                         goto done;
  824                 }
  825 
  826                 /*
  827                  * 2. Check if we have any address on the outgoing interface
  828                  *    belonging to this jail.
  829                  */
  830                 ia = NULL;
  831                 ifp = sro.ro_rt->rt_ifp;
  832                 IF_ADDR_RLOCK(ifp);
  833                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  834                         sa = ifa->ifa_addr;
  835                         if (sa->sa_family != AF_INET)
  836                                 continue;
  837                         sin = (struct sockaddr_in *)sa;
  838                         if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
  839                                 ia = (struct in_ifaddr *)ifa;
  840                                 break;
  841                         }
  842                 }
  843                 if (ia != NULL) {
  844                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  845                         IF_ADDR_RUNLOCK(ifp);
  846                         goto done;
  847                 }
  848                 IF_ADDR_RUNLOCK(ifp);
  849 
  850                 /* 3. As a last resort return the 'default' jail address. */
  851                 error = prison_get_ip4(cred, laddr);
  852                 goto done;
  853         }
  854 
  855         /*
  856          * The outgoing interface is marked with 'loopback net', so a route
  857          * to ourselves is here.
  858          * Try to find the interface of the destination address and then
  859          * take the address from there. That interface is not necessarily
  860          * a loopback interface.
  861          * In case of jails, check that it is an address of the jail
  862          * and if we cannot find, fall back to the 'default' jail address.
  863          */
  864         if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
  865                 struct sockaddr_in sain;
  866                 struct in_ifaddr *ia;
  867 
  868                 bzero(&sain, sizeof(struct sockaddr_in));
  869                 sain.sin_family = AF_INET;
  870                 sain.sin_len = sizeof(struct sockaddr_in);
  871                 sain.sin_addr.s_addr = faddr->s_addr;
  872 
  873                 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain)));
  874                 if (ia == NULL)
  875                         ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0));
  876                 if (ia == NULL)
  877                         ia = ifatoia(ifa_ifwithaddr(sintosa(&sain)));
  878 
  879                 if (cred == NULL || !prison_flag(cred, PR_IP4)) {
  880                         if (ia == NULL) {
  881                                 error = ENETUNREACH;
  882                                 goto done;
  883                         }
  884                         laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  885                         ifa_free(&ia->ia_ifa);
  886                         goto done;
  887                 }
  888 
  889                 /* Jailed. */
  890                 if (ia != NULL) {
  891                         struct ifnet *ifp;
  892 
  893                         ifp = ia->ia_ifp;
  894                         ifa_free(&ia->ia_ifa);
  895                         ia = NULL;
  896                         IF_ADDR_RLOCK(ifp);
  897                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  898 
  899                                 sa = ifa->ifa_addr;
  900                                 if (sa->sa_family != AF_INET)
  901                                         continue;
  902                                 sin = (struct sockaddr_in *)sa;
  903                                 if (prison_check_ip4(cred,
  904                                     &sin->sin_addr) == 0) {
  905                                         ia = (struct in_ifaddr *)ifa;
  906                                         break;
  907                                 }
  908                         }
  909                         if (ia != NULL) {
  910                                 laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
  911                                 IF_ADDR_RUNLOCK(ifp);
  912                                 goto done;
  913                         }
  914                         IF_ADDR_RUNLOCK(ifp);
  915                 }
  916 
  917                 /* 3. As a last resort return the 'default' jail address. */
  918                 error = prison_get_ip4(cred, laddr);
  919                 goto done;
  920         }
  921 
  922 done:
  923         if (sro.ro_rt != NULL)
  924                 RTFREE(sro.ro_rt);
  925         return (error);
  926 }
  927 
  928 /*
  929  * Set up for a connect from a socket to the specified address.
  930  * On entry, *laddrp and *lportp should contain the current local
  931  * address and port for the PCB; these are updated to the values
  932  * that should be placed in inp_laddr and inp_lport to complete
  933  * the connect.
  934  *
  935  * On success, *faddrp and *fportp will be set to the remote address
  936  * and port. These are not updated in the error case.
  937  *
  938  * If the operation fails because the connection already exists,
  939  * *oinpp will be set to the PCB of that connection so that the
  940  * caller can decide to override it. In all other cases, *oinpp
  941  * is set to NULL.
  942  */
  943 int
  944 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
  945     in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
  946     struct inpcb **oinpp, struct ucred *cred)
  947 {
  948         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
  949         struct in_ifaddr *ia;
  950         struct inpcb *oinp;
  951         struct in_addr laddr, faddr;
  952         u_short lport, fport;
  953         int error;
  954 
  955         /*
  956          * Because a global state change doesn't actually occur here, a read
  957          * lock is sufficient.
  958          */
  959         INP_LOCK_ASSERT(inp);
  960         INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo);
  961 
  962         if (oinpp != NULL)
  963                 *oinpp = NULL;
  964         if (nam->sa_len != sizeof (*sin))
  965                 return (EINVAL);
  966         if (sin->sin_family != AF_INET)
  967                 return (EAFNOSUPPORT);
  968         if (sin->sin_port == 0)
  969                 return (EADDRNOTAVAIL);
  970         laddr.s_addr = *laddrp;
  971         lport = *lportp;
  972         faddr = sin->sin_addr;
  973         fport = sin->sin_port;
  974 
  975         if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
  976                 /*
  977                  * If the destination address is INADDR_ANY,
  978                  * use the primary local address.
  979                  * If the supplied address is INADDR_BROADCAST,
  980                  * and the primary interface supports broadcast,
  981                  * choose the broadcast address for that interface.
  982                  */
  983                 if (faddr.s_addr == INADDR_ANY) {
  984                         IN_IFADDR_RLOCK();
  985                         faddr =
  986                             IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
  987                         IN_IFADDR_RUNLOCK();
  988                         if (cred != NULL &&
  989                             (error = prison_get_ip4(cred, &faddr)) != 0)
  990                                 return (error);
  991                 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
  992                         IN_IFADDR_RLOCK();
  993                         if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
  994                             IFF_BROADCAST)
  995                                 faddr = satosin(&TAILQ_FIRST(
  996                                     &V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
  997                         IN_IFADDR_RUNLOCK();
  998                 }
  999         }
 1000         if (laddr.s_addr == INADDR_ANY) {
 1001                 error = in_pcbladdr(inp, &faddr, &laddr, cred);
 1002                 /*
 1003                  * If the destination address is multicast and an outgoing
 1004                  * interface has been set as a multicast option, prefer the
 1005                  * address of that interface as our source address.
 1006                  */
 1007                 if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
 1008                     inp->inp_moptions != NULL) {
 1009                         struct ip_moptions *imo;
 1010                         struct ifnet *ifp;
 1011 
 1012                         imo = inp->inp_moptions;
 1013                         if (imo->imo_multicast_ifp != NULL) {
 1014                                 ifp = imo->imo_multicast_ifp;
 1015                                 IN_IFADDR_RLOCK();
 1016                                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
 1017                                         if ((ia->ia_ifp == ifp) &&
 1018                                             (cred == NULL ||
 1019                                             prison_check_ip4(cred,
 1020                                             &ia->ia_addr.sin_addr) == 0))
 1021                                                 break;
 1022                                 }
 1023                                 if (ia == NULL)
 1024                                         error = EADDRNOTAVAIL;
 1025                                 else {
 1026                                         laddr = ia->ia_addr.sin_addr;
 1027                                         error = 0;
 1028                                 }
 1029                                 IN_IFADDR_RUNLOCK();
 1030                         }
 1031                 }
 1032                 if (error)
 1033                         return (error);
 1034         }
 1035         oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, fport,
 1036             laddr, lport, 0, NULL);
 1037         if (oinp != NULL) {
 1038                 if (oinpp != NULL)
 1039                         *oinpp = oinp;
 1040                 return (EADDRINUSE);
 1041         }
 1042         if (lport == 0) {
 1043                 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
 1044                     cred);
 1045                 if (error)
 1046                         return (error);
 1047         }
 1048         *laddrp = laddr.s_addr;
 1049         *lportp = lport;
 1050         *faddrp = faddr.s_addr;
 1051         *fportp = fport;
 1052         return (0);
 1053 }
 1054 
 1055 void
 1056 in_pcbdisconnect(struct inpcb *inp)
 1057 {
 1058 
 1059         INP_WLOCK_ASSERT(inp);
 1060         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 1061 
 1062         inp->inp_faddr.s_addr = INADDR_ANY;
 1063         inp->inp_fport = 0;
 1064         in_pcbrehash(inp);
 1065 }
 1066 #endif /* INET */
 1067 
 1068 /*
 1069  * in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
 1070  * For most protocols, this will be invoked immediately prior to calling
 1071  * in_pcbfree().  However, with TCP the inpcb may significantly outlive the
 1072  * socket, in which case in_pcbfree() is deferred.
 1073  */
 1074 void
 1075 in_pcbdetach(struct inpcb *inp)
 1076 {
 1077 
 1078         KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
 1079 
 1080         inp->inp_socket->so_pcb = NULL;
 1081         inp->inp_socket = NULL;
 1082 }
 1083 
 1084 /*
 1085  * in_pcbref() bumps the reference count on an inpcb in order to maintain
 1086  * stability of an inpcb pointer despite the inpcb lock being released.  This
 1087  * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
 1088  * but where the inpcb lock may already held, or when acquiring a reference
 1089  * via a pcbgroup.
 1090  *
 1091  * in_pcbref() should be used only to provide brief memory stability, and
 1092  * must always be followed by a call to INP_WLOCK() and in_pcbrele() to
 1093  * garbage collect the inpcb if it has been in_pcbfree()'d from another
 1094  * context.  Until in_pcbrele() has returned that the inpcb is still valid,
 1095  * lock and rele are the *only* safe operations that may be performed on the
 1096  * inpcb.
 1097  *
 1098  * While the inpcb will not be freed, releasing the inpcb lock means that the
 1099  * connection's state may change, so the caller should be careful to
 1100  * revalidate any cached state on reacquiring the lock.  Drop the reference
 1101  * using in_pcbrele().
 1102  */
 1103 void
 1104 in_pcbref(struct inpcb *inp)
 1105 {
 1106 
 1107         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
 1108 
 1109         refcount_acquire(&inp->inp_refcount);
 1110 }
 1111 
 1112 /*
 1113  * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
 1114  * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
 1115  * return a flag indicating whether or not the inpcb remains valid.  If it is
 1116  * valid, we return with the inpcb lock held.
 1117  *
 1118  * Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a
 1119  * reference on an inpcb.  Historically more work was done here (actually, in
 1120  * in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the
 1121  * need for the pcbinfo lock in in_pcbrele().  Deferring the free is entirely
 1122  * about memory stability (and continued use of the write lock).
 1123  */
 1124 int
 1125 in_pcbrele_rlocked(struct inpcb *inp)
 1126 {
 1127         struct inpcbinfo *pcbinfo;
 1128 
 1129         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
 1130 
 1131         INP_RLOCK_ASSERT(inp);
 1132 
 1133         if (refcount_release(&inp->inp_refcount) == 0) {
 1134                 /*
 1135                  * If the inpcb has been freed, let the caller know, even if
 1136                  * this isn't the last reference.
 1137                  */
 1138                 if (inp->inp_flags2 & INP_FREED) {
 1139                         INP_RUNLOCK(inp);
 1140                         return (1);
 1141                 }
 1142                 return (0);
 1143         }
 1144 
 1145         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
 1146 
 1147         INP_RUNLOCK(inp);
 1148         pcbinfo = inp->inp_pcbinfo;
 1149         uma_zfree(pcbinfo->ipi_zone, inp);
 1150         return (1);
 1151 }
 1152 
 1153 int
 1154 in_pcbrele_wlocked(struct inpcb *inp)
 1155 {
 1156         struct inpcbinfo *pcbinfo;
 1157 
 1158         KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
 1159 
 1160         INP_WLOCK_ASSERT(inp);
 1161 
 1162         if (refcount_release(&inp->inp_refcount) == 0) {
 1163                 /*
 1164                  * If the inpcb has been freed, let the caller know, even if
 1165                  * this isn't the last reference.
 1166                  */
 1167                 if (inp->inp_flags2 & INP_FREED) {
 1168                         INP_WUNLOCK(inp);
 1169                         return (1);
 1170                 }
 1171                 return (0);
 1172         }
 1173 
 1174         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
 1175 
 1176         INP_WUNLOCK(inp);
 1177         pcbinfo = inp->inp_pcbinfo;
 1178         uma_zfree(pcbinfo->ipi_zone, inp);
 1179         return (1);
 1180 }
 1181 
 1182 /*
 1183  * Temporary wrapper.
 1184  */
 1185 int
 1186 in_pcbrele(struct inpcb *inp)
 1187 {
 1188 
 1189         return (in_pcbrele_wlocked(inp));
 1190 }
 1191 
 1192 /*
 1193  * Unconditionally schedule an inpcb to be freed by decrementing its
 1194  * reference count, which should occur only after the inpcb has been detached
 1195  * from its socket.  If another thread holds a temporary reference (acquired
 1196  * using in_pcbref()) then the free is deferred until that reference is
 1197  * released using in_pcbrele(), but the inpcb is still unlocked.  Almost all
 1198  * work, including removal from global lists, is done in this context, where
 1199  * the pcbinfo lock is held.
 1200  */
 1201 void
 1202 in_pcbfree(struct inpcb *inp)
 1203 {
 1204         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 1205 
 1206         KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
 1207 
 1208 #ifdef INVARIANTS
 1209         if (pcbinfo == &V_tcbinfo) {
 1210                 INP_INFO_LOCK_ASSERT(pcbinfo);
 1211         } else {
 1212                 INP_INFO_WLOCK_ASSERT(pcbinfo);
 1213         }
 1214 #endif
 1215         INP_WLOCK_ASSERT(inp);
 1216 
 1217         /* XXXRW: Do as much as possible here. */
 1218 #ifdef IPSEC
 1219         if (inp->inp_sp != NULL)
 1220                 ipsec_delete_pcbpolicy(inp);
 1221 #endif
 1222         INP_LIST_WLOCK(pcbinfo);
 1223         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 1224         in_pcbremlists(inp);
 1225         INP_LIST_WUNLOCK(pcbinfo);
 1226 #ifdef INET6
 1227         if (inp->inp_vflag & INP_IPV6PROTO) {
 1228                 ip6_freepcbopts(inp->in6p_outputopts);
 1229                 if (inp->in6p_moptions != NULL)
 1230                         ip6_freemoptions(inp->in6p_moptions);
 1231         }
 1232 #endif
 1233         if (inp->inp_options)
 1234                 (void)m_free(inp->inp_options);
 1235 #ifdef INET
 1236         if (inp->inp_moptions != NULL)
 1237                 inp_freemoptions(inp->inp_moptions);
 1238 #endif
 1239         inp->inp_vflag = 0;
 1240         inp->inp_flags2 |= INP_FREED;
 1241         crfree(inp->inp_cred);
 1242 #ifdef MAC
 1243         mac_inpcb_destroy(inp);
 1244 #endif
 1245         if (!in_pcbrele_wlocked(inp))
 1246                 INP_WUNLOCK(inp);
 1247 }
 1248 
 1249 /*
 1250  * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
 1251  * port reservation, and preventing it from being returned by inpcb lookups.
 1252  *
 1253  * It is used by TCP to mark an inpcb as unused and avoid future packet
 1254  * delivery or event notification when a socket remains open but TCP has
 1255  * closed.  This might occur as a result of a shutdown()-initiated TCP close
 1256  * or a RST on the wire, and allows the port binding to be reused while still
 1257  * maintaining the invariant that so_pcb always points to a valid inpcb until
 1258  * in_pcbdetach().
 1259  *
 1260  * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
 1261  * in_pcbnotifyall() and in_pcbpurgeif0()?
 1262  */
 1263 void
 1264 in_pcbdrop(struct inpcb *inp)
 1265 {
 1266 
 1267         INP_WLOCK_ASSERT(inp);
 1268 
 1269         /*
 1270          * XXXRW: Possibly we should protect the setting of INP_DROPPED with
 1271          * the hash lock...?
 1272          */
 1273         inp->inp_flags |= INP_DROPPED;
 1274         if (inp->inp_flags & INP_INHASHLIST) {
 1275                 struct inpcbport *phd = inp->inp_phd;
 1276 
 1277                 INP_HASH_WLOCK(inp->inp_pcbinfo);
 1278                 LIST_REMOVE(inp, inp_hash);
 1279                 LIST_REMOVE(inp, inp_portlist);
 1280                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 1281                         LIST_REMOVE(phd, phd_hash);
 1282                         free(phd, M_PCB);
 1283                 }
 1284                 INP_HASH_WUNLOCK(inp->inp_pcbinfo);
 1285                 inp->inp_flags &= ~INP_INHASHLIST;
 1286 #ifdef PCBGROUP
 1287                 in_pcbgroup_remove(inp);
 1288 #endif
 1289         }
 1290 }
 1291 
 1292 #ifdef INET
 1293 /*
 1294  * Common routines to return the socket addresses associated with inpcbs.
 1295  */
 1296 struct sockaddr *
 1297 in_sockaddr(in_port_t port, struct in_addr *addr_p)
 1298 {
 1299         struct sockaddr_in *sin;
 1300 
 1301         sin = malloc(sizeof *sin, M_SONAME,
 1302                 M_WAITOK | M_ZERO);
 1303         sin->sin_family = AF_INET;
 1304         sin->sin_len = sizeof(*sin);
 1305         sin->sin_addr = *addr_p;
 1306         sin->sin_port = port;
 1307 
 1308         return (struct sockaddr *)sin;
 1309 }
 1310 
 1311 int
 1312 in_getsockaddr(struct socket *so, struct sockaddr **nam)
 1313 {
 1314         struct inpcb *inp;
 1315         struct in_addr addr;
 1316         in_port_t port;
 1317 
 1318         inp = sotoinpcb(so);
 1319         KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
 1320 
 1321         INP_RLOCK(inp);
 1322         port = inp->inp_lport;
 1323         addr = inp->inp_laddr;
 1324         INP_RUNLOCK(inp);
 1325 
 1326         *nam = in_sockaddr(port, &addr);
 1327         return 0;
 1328 }
 1329 
 1330 int
 1331 in_getpeeraddr(struct socket *so, struct sockaddr **nam)
 1332 {
 1333         struct inpcb *inp;
 1334         struct in_addr addr;
 1335         in_port_t port;
 1336 
 1337         inp = sotoinpcb(so);
 1338         KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
 1339 
 1340         INP_RLOCK(inp);
 1341         port = inp->inp_fport;
 1342         addr = inp->inp_faddr;
 1343         INP_RUNLOCK(inp);
 1344 
 1345         *nam = in_sockaddr(port, &addr);
 1346         return 0;
 1347 }
 1348 
 1349 void
 1350 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
 1351     struct inpcb *(*notify)(struct inpcb *, int))
 1352 {
 1353         struct inpcb *inp, *inp_temp;
 1354 
 1355         INP_INFO_WLOCK(pcbinfo);
 1356         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
 1357                 INP_WLOCK(inp);
 1358 #ifdef INET6
 1359                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 1360                         INP_WUNLOCK(inp);
 1361                         continue;
 1362                 }
 1363 #endif
 1364                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
 1365                     inp->inp_socket == NULL) {
 1366                         INP_WUNLOCK(inp);
 1367                         continue;
 1368                 }
 1369                 if ((*notify)(inp, errno))
 1370                         INP_WUNLOCK(inp);
 1371         }
 1372         INP_INFO_WUNLOCK(pcbinfo);
 1373 }
 1374 
 1375 void
 1376 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 1377 {
 1378         struct inpcb *inp;
 1379         struct ip_moptions *imo;
 1380         int i, gap;
 1381 
 1382         INP_INFO_WLOCK(pcbinfo);
 1383         LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
 1384                 INP_WLOCK(inp);
 1385                 imo = inp->inp_moptions;
 1386                 if ((inp->inp_vflag & INP_IPV4) &&
 1387                     imo != NULL) {
 1388                         /*
 1389                          * Unselect the outgoing interface if it is being
 1390                          * detached.
 1391                          */
 1392                         if (imo->imo_multicast_ifp == ifp)
 1393                                 imo->imo_multicast_ifp = NULL;
 1394 
 1395                         /*
 1396                          * Drop multicast group membership if we joined
 1397                          * through the interface being detached.
 1398                          */
 1399                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
 1400                             i++) {
 1401                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
 1402                                         in_delmulti(imo->imo_membership[i]);
 1403                                         gap++;
 1404                                 } else if (gap != 0)
 1405                                         imo->imo_membership[i - gap] =
 1406                                             imo->imo_membership[i];
 1407                         }
 1408                         imo->imo_num_memberships -= gap;
 1409                 }
 1410                 INP_WUNLOCK(inp);
 1411         }
 1412         INP_INFO_WUNLOCK(pcbinfo);
 1413 }
 1414 
 1415 /*
 1416  * Lookup a PCB based on the local address and port.  Caller must hold the
 1417  * hash lock.  No inpcb locks or references are acquired.
 1418  */
 1419 #define INP_LOOKUP_MAPPED_PCB_COST      3
 1420 struct inpcb *
 1421 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
 1422     u_short lport, int lookupflags, struct ucred *cred)
 1423 {
 1424         struct inpcb *inp;
 1425 #ifdef INET6
 1426         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
 1427 #else
 1428         int matchwild = 3;
 1429 #endif
 1430         int wildcard;
 1431 
 1432         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
 1433             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1434 
 1435         INP_HASH_LOCK_ASSERT(pcbinfo);
 1436 
 1437         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
 1438                 struct inpcbhead *head;
 1439                 /*
 1440                  * Look for an unconnected (wildcard foreign addr) PCB that
 1441                  * matches the local address and port we're looking for.
 1442                  */
 1443                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 1444                     0, pcbinfo->ipi_hashmask)];
 1445                 LIST_FOREACH(inp, head, inp_hash) {
 1446 #ifdef INET6
 1447                         /* XXX inp locking */
 1448                         if ((inp->inp_vflag & INP_IPV4) == 0)
 1449                                 continue;
 1450 #endif
 1451                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
 1452                             inp->inp_laddr.s_addr == laddr.s_addr &&
 1453                             inp->inp_lport == lport) {
 1454                                 /*
 1455                                  * Found?
 1456                                  */
 1457                                 if (cred == NULL ||
 1458                                     prison_equal_ip4(cred->cr_prison,
 1459                                         inp->inp_cred->cr_prison))
 1460                                         return (inp);
 1461                         }
 1462                 }
 1463                 /*
 1464                  * Not found.
 1465                  */
 1466                 return (NULL);
 1467         } else {
 1468                 struct inpcbporthead *porthash;
 1469                 struct inpcbport *phd;
 1470                 struct inpcb *match = NULL;
 1471                 /*
 1472                  * Best fit PCB lookup.
 1473                  *
 1474                  * First see if this local port is in use by looking on the
 1475                  * port hash list.
 1476                  */
 1477                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 1478                     pcbinfo->ipi_porthashmask)];
 1479                 LIST_FOREACH(phd, porthash, phd_hash) {
 1480                         if (phd->phd_port == lport)
 1481                                 break;
 1482                 }
 1483                 if (phd != NULL) {
 1484                         /*
 1485                          * Port is in use by one or more PCBs. Look for best
 1486                          * fit.
 1487                          */
 1488                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 1489                                 wildcard = 0;
 1490                                 if (cred != NULL &&
 1491                                     !prison_equal_ip4(inp->inp_cred->cr_prison,
 1492                                         cred->cr_prison))
 1493                                         continue;
 1494 #ifdef INET6
 1495                                 /* XXX inp locking */
 1496                                 if ((inp->inp_vflag & INP_IPV4) == 0)
 1497                                         continue;
 1498                                 /*
 1499                                  * We never select the PCB that has
 1500                                  * INP_IPV6 flag and is bound to :: if
 1501                                  * we have another PCB which is bound
 1502                                  * to 0.0.0.0.  If a PCB has the
 1503                                  * INP_IPV6 flag, then we set its cost
 1504                                  * higher than IPv4 only PCBs.
 1505                                  *
 1506                                  * Note that the case only happens
 1507                                  * when a socket is bound to ::, under
 1508                                  * the condition that the use of the
 1509                                  * mapped address is allowed.
 1510                                  */
 1511                                 if ((inp->inp_vflag & INP_IPV6) != 0)
 1512                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
 1513 #endif
 1514                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
 1515                                         wildcard++;
 1516                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
 1517                                         if (laddr.s_addr == INADDR_ANY)
 1518                                                 wildcard++;
 1519                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
 1520                                                 continue;
 1521                                 } else {
 1522                                         if (laddr.s_addr != INADDR_ANY)
 1523                                                 wildcard++;
 1524                                 }
 1525                                 if (wildcard < matchwild) {
 1526                                         match = inp;
 1527                                         matchwild = wildcard;
 1528                                         if (matchwild == 0)
 1529                                                 break;
 1530                                 }
 1531                         }
 1532                 }
 1533                 return (match);
 1534         }
 1535 }
 1536 #undef INP_LOOKUP_MAPPED_PCB_COST
 1537 
 1538 #ifdef PCBGROUP
 1539 /*
 1540  * Lookup PCB in hash list, using pcbgroup tables.
 1541  */
 1542 static struct inpcb *
 1543 in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
 1544     struct in_addr faddr, u_int fport_arg, struct in_addr laddr,
 1545     u_int lport_arg, int lookupflags, struct ifnet *ifp)
 1546 {
 1547         struct inpcbhead *head;
 1548         struct inpcb *inp, *tmpinp;
 1549         u_short fport = fport_arg, lport = lport_arg;
 1550 
 1551         /*
 1552          * First look for an exact match.
 1553          */
 1554         tmpinp = NULL;
 1555         INP_GROUP_LOCK(pcbgroup);
 1556         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
 1557             pcbgroup->ipg_hashmask)];
 1558         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
 1559 #ifdef INET6
 1560                 /* XXX inp locking */
 1561                 if ((inp->inp_vflag & INP_IPV4) == 0)
 1562                         continue;
 1563 #endif
 1564                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
 1565                     inp->inp_laddr.s_addr == laddr.s_addr &&
 1566                     inp->inp_fport == fport &&
 1567                     inp->inp_lport == lport) {
 1568                         /*
 1569                          * XXX We should be able to directly return
 1570                          * the inp here, without any checks.
 1571                          * Well unless both bound with SO_REUSEPORT?
 1572                          */
 1573                         if (prison_flag(inp->inp_cred, PR_IP4))
 1574                                 goto found;
 1575                         if (tmpinp == NULL)
 1576                                 tmpinp = inp;
 1577                 }
 1578         }
 1579         if (tmpinp != NULL) {
 1580                 inp = tmpinp;
 1581                 goto found;
 1582         }
 1583 
 1584         /*
 1585          * Then look for a wildcard match, if requested.
 1586          */
 1587         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 1588                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 1589 #ifdef INET6
 1590                 struct inpcb *local_wild_mapped = NULL;
 1591 #endif
 1592                 struct inpcb *jail_wild = NULL;
 1593                 struct inpcbhead *head;
 1594                 int injail;
 1595 
 1596                 /*
 1597                  * Order of socket selection - we always prefer jails.
 1598                  *      1. jailed, non-wild.
 1599                  *      2. jailed, wild.
 1600                  *      3. non-jailed, non-wild.
 1601                  *      4. non-jailed, wild.
 1602                  */
 1603                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
 1604                     0, pcbinfo->ipi_wildmask)];
 1605                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
 1606 #ifdef INET6
 1607                         /* XXX inp locking */
 1608                         if ((inp->inp_vflag & INP_IPV4) == 0)
 1609                                 continue;
 1610 #endif
 1611                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
 1612                             inp->inp_lport != lport)
 1613                                 continue;
 1614 
 1615                         /* XXX inp locking */
 1616                         if (ifp && ifp->if_type == IFT_FAITH &&
 1617                             (inp->inp_flags & INP_FAITH) == 0)
 1618                                 continue;
 1619 
 1620                         injail = prison_flag(inp->inp_cred, PR_IP4);
 1621                         if (injail) {
 1622                                 if (prison_check_ip4(inp->inp_cred,
 1623                                     &laddr) != 0)
 1624                                         continue;
 1625                         } else {
 1626                                 if (local_exact != NULL)
 1627                                         continue;
 1628                         }
 1629 
 1630                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
 1631                                 if (injail)
 1632                                         goto found;
 1633                                 else
 1634                                         local_exact = inp;
 1635                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
 1636 #ifdef INET6
 1637                                 /* XXX inp locking, NULL check */
 1638                                 if (inp->inp_vflag & INP_IPV6PROTO)
 1639                                         local_wild_mapped = inp;
 1640                                 else
 1641 #endif
 1642                                         if (injail)
 1643                                                 jail_wild = inp;
 1644                                         else
 1645                                                 local_wild = inp;
 1646                         }
 1647                 } /* LIST_FOREACH */
 1648                 inp = jail_wild;
 1649                 if (inp == NULL)
 1650                         inp = local_exact;
 1651                 if (inp == NULL)
 1652                         inp = local_wild;
 1653 #ifdef INET6
 1654                 if (inp == NULL)
 1655                         inp = local_wild_mapped;
 1656 #endif
 1657                 if (inp != NULL)
 1658                         goto found;
 1659         } /* if (lookupflags & INPLOOKUP_WILDCARD) */
 1660         INP_GROUP_UNLOCK(pcbgroup);
 1661         return (NULL);
 1662 
 1663 found:
 1664         in_pcbref(inp);
 1665         INP_GROUP_UNLOCK(pcbgroup);
 1666         if (lookupflags & INPLOOKUP_WLOCKPCB) {
 1667                 INP_WLOCK(inp);
 1668                 if (in_pcbrele_wlocked(inp))
 1669                         return (NULL);
 1670         } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
 1671                 INP_RLOCK(inp);
 1672                 if (in_pcbrele_rlocked(inp))
 1673                         return (NULL);
 1674         } else
 1675                 panic("%s: locking bug", __func__);
 1676         return (inp);
 1677 }
 1678 #endif /* PCBGROUP */
 1679 
 1680 /*
 1681  * Lookup PCB in hash list, using pcbinfo tables.  This variation assumes
 1682  * that the caller has locked the hash list, and will not perform any further
 1683  * locking or reference operations on either the hash list or the connection.
 1684  */
 1685 static struct inpcb *
 1686 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr,
 1687     u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags,
 1688     struct ifnet *ifp)
 1689 {
 1690         struct inpcbhead *head;
 1691         struct inpcb *inp, *tmpinp;
 1692         u_short fport = fport_arg, lport = lport_arg;
 1693 
 1694         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
 1695             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1696 
 1697         INP_HASH_LOCK_ASSERT(pcbinfo);
 1698 
 1699         /*
 1700          * First look for an exact match.
 1701          */
 1702         tmpinp = NULL;
 1703         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
 1704             pcbinfo->ipi_hashmask)];
 1705         LIST_FOREACH(inp, head, inp_hash) {
 1706 #ifdef INET6
 1707                 /* XXX inp locking */
 1708                 if ((inp->inp_vflag & INP_IPV4) == 0)
 1709                         continue;
 1710 #endif
 1711                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
 1712                     inp->inp_laddr.s_addr == laddr.s_addr &&
 1713                     inp->inp_fport == fport &&
 1714                     inp->inp_lport == lport) {
 1715                         /*
 1716                          * XXX We should be able to directly return
 1717                          * the inp here, without any checks.
 1718                          * Well unless both bound with SO_REUSEPORT?
 1719                          */
 1720                         if (prison_flag(inp->inp_cred, PR_IP4))
 1721                                 return (inp);
 1722                         if (tmpinp == NULL)
 1723                                 tmpinp = inp;
 1724                 }
 1725         }
 1726         if (tmpinp != NULL)
 1727                 return (tmpinp);
 1728 
 1729         /*
 1730          * Then look for a wildcard match, if requested.
 1731          */
 1732         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 1733                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 1734 #ifdef INET6
 1735                 struct inpcb *local_wild_mapped = NULL;
 1736 #endif
 1737                 struct inpcb *jail_wild = NULL;
 1738                 int injail;
 1739 
 1740                 /*
 1741                  * Order of socket selection - we always prefer jails.
 1742                  *      1. jailed, non-wild.
 1743                  *      2. jailed, wild.
 1744                  *      3. non-jailed, non-wild.
 1745                  *      4. non-jailed, wild.
 1746                  */
 1747 
 1748                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 1749                     0, pcbinfo->ipi_hashmask)];
 1750                 LIST_FOREACH(inp, head, inp_hash) {
 1751 #ifdef INET6
 1752                         /* XXX inp locking */
 1753                         if ((inp->inp_vflag & INP_IPV4) == 0)
 1754                                 continue;
 1755 #endif
 1756                         if (inp->inp_faddr.s_addr != INADDR_ANY ||
 1757                             inp->inp_lport != lport)
 1758                                 continue;
 1759 
 1760                         /* XXX inp locking */
 1761                         if (ifp && ifp->if_type == IFT_FAITH &&
 1762                             (inp->inp_flags & INP_FAITH) == 0)
 1763                                 continue;
 1764 
 1765                         injail = prison_flag(inp->inp_cred, PR_IP4);
 1766                         if (injail) {
 1767                                 if (prison_check_ip4(inp->inp_cred,
 1768                                     &laddr) != 0)
 1769                                         continue;
 1770                         } else {
 1771                                 if (local_exact != NULL)
 1772                                         continue;
 1773                         }
 1774 
 1775                         if (inp->inp_laddr.s_addr == laddr.s_addr) {
 1776                                 if (injail)
 1777                                         return (inp);
 1778                                 else
 1779                                         local_exact = inp;
 1780                         } else if (inp->inp_laddr.s_addr == INADDR_ANY) {
 1781 #ifdef INET6
 1782                                 /* XXX inp locking, NULL check */
 1783                                 if (inp->inp_vflag & INP_IPV6PROTO)
 1784                                         local_wild_mapped = inp;
 1785                                 else
 1786 #endif
 1787                                         if (injail)
 1788                                                 jail_wild = inp;
 1789                                         else
 1790                                                 local_wild = inp;
 1791                         }
 1792                 } /* LIST_FOREACH */
 1793                 if (jail_wild != NULL)
 1794                         return (jail_wild);
 1795                 if (local_exact != NULL)
 1796                         return (local_exact);
 1797                 if (local_wild != NULL)
 1798                         return (local_wild);
 1799 #ifdef INET6
 1800                 if (local_wild_mapped != NULL)
 1801                         return (local_wild_mapped);
 1802 #endif
 1803         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
 1804 
 1805         return (NULL);
 1806 }
 1807 
 1808 /*
 1809  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
 1810  * hash list lock, and will return the inpcb locked (i.e., requires
 1811  * INPLOOKUP_LOCKPCB).
 1812  */
 1813 static struct inpcb *
 1814 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
 1815     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
 1816     struct ifnet *ifp)
 1817 {
 1818         struct inpcb *inp;
 1819 
 1820         INP_HASH_RLOCK(pcbinfo);
 1821         inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
 1822             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
 1823         if (inp != NULL) {
 1824                 in_pcbref(inp);
 1825                 INP_HASH_RUNLOCK(pcbinfo);
 1826                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
 1827                         INP_WLOCK(inp);
 1828                         if (in_pcbrele_wlocked(inp))
 1829                                 return (NULL);
 1830                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
 1831                         INP_RLOCK(inp);
 1832                         if (in_pcbrele_rlocked(inp))
 1833                                 return (NULL);
 1834                 } else
 1835                         panic("%s: locking bug", __func__);
 1836         } else
 1837                 INP_HASH_RUNLOCK(pcbinfo);
 1838         return (inp);
 1839 }
 1840 
 1841 /*
 1842  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
 1843  * from which a pre-calculated hash value may be extracted.
 1844  *
 1845  * Possibly more of this logic should be in in_pcbgroup.c.
 1846  */
 1847 struct inpcb *
 1848 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport,
 1849     struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp)
 1850 {
 1851 #if defined(PCBGROUP)
 1852         struct inpcbgroup *pcbgroup;
 1853 #endif
 1854 
 1855         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
 1856             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1857         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
 1858             ("%s: LOCKPCB not set", __func__));
 1859 
 1860 #if defined(PCBGROUP)
 1861         if (in_pcbgroup_enabled(pcbinfo)) {
 1862                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
 1863                     fport);
 1864                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
 1865                     laddr, lport, lookupflags, ifp));
 1866         }
 1867 #endif
 1868         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
 1869             lookupflags, ifp));
 1870 }
 1871 
 1872 struct inpcb *
 1873 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr,
 1874     u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
 1875     struct ifnet *ifp, struct mbuf *m)
 1876 {
 1877 #ifdef PCBGROUP
 1878         struct inpcbgroup *pcbgroup;
 1879 #endif
 1880 
 1881         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
 1882             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1883         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
 1884             ("%s: LOCKPCB not set", __func__));
 1885 
 1886 #ifdef PCBGROUP
 1887         if (in_pcbgroup_enabled(pcbinfo)) {
 1888                 pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
 1889                     m->m_pkthdr.flowid);
 1890                 if (pcbgroup != NULL)
 1891                         return (in_pcblookup_group(pcbinfo, pcbgroup, faddr,
 1892                             fport, laddr, lport, lookupflags, ifp));
 1893                 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
 1894                     fport);
 1895                 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
 1896                     laddr, lport, lookupflags, ifp));
 1897         }
 1898 #endif
 1899         return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
 1900             lookupflags, ifp));
 1901 }
 1902 #endif /* INET */
 1903 
 1904 /*
 1905  * Insert PCB onto various hash lists.
 1906  */
 1907 static int
 1908 in_pcbinshash_internal(struct inpcb *inp, int do_pcbgroup_update)
 1909 {
 1910         struct inpcbhead *pcbhash;
 1911         struct inpcbporthead *pcbporthash;
 1912         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 1913         struct inpcbport *phd;
 1914         u_int32_t hashkey_faddr;
 1915 
 1916         INP_WLOCK_ASSERT(inp);
 1917         INP_HASH_WLOCK_ASSERT(pcbinfo);
 1918 
 1919         KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
 1920             ("in_pcbinshash: INP_INHASHLIST"));
 1921 
 1922 #ifdef INET6
 1923         if (inp->inp_vflag & INP_IPV6)
 1924                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
 1925         else
 1926 #endif
 1927         hashkey_faddr = inp->inp_faddr.s_addr;
 1928 
 1929         pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
 1930                  inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
 1931 
 1932         pcbporthash = &pcbinfo->ipi_porthashbase[
 1933             INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
 1934 
 1935         /*
 1936          * Go through port list and look for a head for this lport.
 1937          */
 1938         LIST_FOREACH(phd, pcbporthash, phd_hash) {
 1939                 if (phd->phd_port == inp->inp_lport)
 1940                         break;
 1941         }
 1942         /*
 1943          * If none exists, malloc one and tack it on.
 1944          */
 1945         if (phd == NULL) {
 1946                 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
 1947                 if (phd == NULL) {
 1948                         return (ENOBUFS); /* XXX */
 1949                 }
 1950                 phd->phd_port = inp->inp_lport;
 1951                 LIST_INIT(&phd->phd_pcblist);
 1952                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
 1953         }
 1954         inp->inp_phd = phd;
 1955         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
 1956         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
 1957         inp->inp_flags |= INP_INHASHLIST;
 1958 #ifdef PCBGROUP
 1959         if (do_pcbgroup_update)
 1960                 in_pcbgroup_update(inp);
 1961 #endif
 1962         return (0);
 1963 }
 1964 
 1965 /*
 1966  * For now, there are two public interfaces to insert an inpcb into the hash
 1967  * lists -- one that does update pcbgroups, and one that doesn't.  The latter
 1968  * is used only in the TCP syncache, where in_pcbinshash is called before the
 1969  * full 4-tuple is set for the inpcb, and we don't want to install in the
 1970  * pcbgroup until later.
 1971  *
 1972  * XXXRW: This seems like a misfeature.  in_pcbinshash should always update
 1973  * connection groups, and partially initialised inpcbs should not be exposed
 1974  * to either reservation hash tables or pcbgroups.
 1975  */
 1976 int
 1977 in_pcbinshash(struct inpcb *inp)
 1978 {
 1979 
 1980         return (in_pcbinshash_internal(inp, 1));
 1981 }
 1982 
 1983 int
 1984 in_pcbinshash_nopcbgroup(struct inpcb *inp)
 1985 {
 1986 
 1987         return (in_pcbinshash_internal(inp, 0));
 1988 }
 1989 
 1990 /*
 1991  * Move PCB to the proper hash bucket when { faddr, fport } have  been
 1992  * changed. NOTE: This does not handle the case of the lport changing (the
 1993  * hashed port list would have to be updated as well), so the lport must
 1994  * not change after in_pcbinshash() has been called.
 1995  */
 1996 void
 1997 in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m)
 1998 {
 1999         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 2000         struct inpcbhead *head;
 2001         u_int32_t hashkey_faddr;
 2002 
 2003         INP_WLOCK_ASSERT(inp);
 2004         INP_HASH_WLOCK_ASSERT(pcbinfo);
 2005 
 2006         KASSERT(inp->inp_flags & INP_INHASHLIST,
 2007             ("in_pcbrehash: !INP_INHASHLIST"));
 2008 
 2009 #ifdef INET6
 2010         if (inp->inp_vflag & INP_IPV6)
 2011                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
 2012         else
 2013 #endif
 2014         hashkey_faddr = inp->inp_faddr.s_addr;
 2015 
 2016         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
 2017                 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
 2018 
 2019         LIST_REMOVE(inp, inp_hash);
 2020         LIST_INSERT_HEAD(head, inp, inp_hash);
 2021 
 2022 #ifdef PCBGROUP
 2023         if (m != NULL)
 2024                 in_pcbgroup_update_mbuf(inp, m);
 2025         else
 2026                 in_pcbgroup_update(inp);
 2027 #endif
 2028 }
 2029 
 2030 void
 2031 in_pcbrehash(struct inpcb *inp)
 2032 {
 2033 
 2034         in_pcbrehash_mbuf(inp, NULL);
 2035 }
 2036 
 2037 /*
 2038  * Remove PCB from various lists.
 2039  */
 2040 static void
 2041 in_pcbremlists(struct inpcb *inp)
 2042 {
 2043         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 2044 
 2045 #ifdef INVARIANTS
 2046         if (pcbinfo == &V_tcbinfo) {
 2047                 INP_INFO_RLOCK_ASSERT(pcbinfo);
 2048         } else {
 2049                 INP_INFO_WLOCK_ASSERT(pcbinfo);
 2050         }
 2051 #endif
 2052 
 2053         INP_WLOCK_ASSERT(inp);
 2054         INP_LIST_WLOCK_ASSERT(pcbinfo);
 2055 
 2056         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
 2057         if (inp->inp_flags & INP_INHASHLIST) {
 2058                 struct inpcbport *phd = inp->inp_phd;
 2059 
 2060                 INP_HASH_WLOCK(pcbinfo);
 2061                 LIST_REMOVE(inp, inp_hash);
 2062                 LIST_REMOVE(inp, inp_portlist);
 2063                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 2064                         LIST_REMOVE(phd, phd_hash);
 2065                         free(phd, M_PCB);
 2066                 }
 2067                 INP_HASH_WUNLOCK(pcbinfo);
 2068                 inp->inp_flags &= ~INP_INHASHLIST;
 2069         }
 2070         LIST_REMOVE(inp, inp_list);
 2071         pcbinfo->ipi_count--;
 2072 #ifdef PCBGROUP
 2073         in_pcbgroup_remove(inp);
 2074 #endif
 2075 }
 2076 
 2077 /*
 2078  * A set label operation has occurred at the socket layer, propagate the
 2079  * label change into the in_pcb for the socket.
 2080  */
 2081 void
 2082 in_pcbsosetlabel(struct socket *so)
 2083 {
 2084 #ifdef MAC
 2085         struct inpcb *inp;
 2086 
 2087         inp = sotoinpcb(so);
 2088         KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
 2089 
 2090         INP_WLOCK(inp);
 2091         SOCK_LOCK(so);
 2092         mac_inpcb_sosetlabel(so, inp);
 2093         SOCK_UNLOCK(so);
 2094         INP_WUNLOCK(inp);
 2095 #endif
 2096 }
 2097 
 2098 /*
 2099  * ipport_tick runs once per second, determining if random port allocation
 2100  * should be continued.  If more than ipport_randomcps ports have been
 2101  * allocated in the last second, then we return to sequential port
 2102  * allocation. We return to random allocation only once we drop below
 2103  * ipport_randomcps for at least ipport_randomtime seconds.
 2104  */
 2105 static void
 2106 ipport_tick(void *xtp)
 2107 {
 2108         VNET_ITERATOR_DECL(vnet_iter);
 2109 
 2110         VNET_LIST_RLOCK_NOSLEEP();
 2111         VNET_FOREACH(vnet_iter) {
 2112                 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
 2113                 if (V_ipport_tcpallocs <=
 2114                     V_ipport_tcplastcount + V_ipport_randomcps) {
 2115                         if (V_ipport_stoprandom > 0)
 2116                                 V_ipport_stoprandom--;
 2117                 } else
 2118                         V_ipport_stoprandom = V_ipport_randomtime;
 2119                 V_ipport_tcplastcount = V_ipport_tcpallocs;
 2120                 CURVNET_RESTORE();
 2121         }
 2122         VNET_LIST_RUNLOCK_NOSLEEP();
 2123         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
 2124 }
 2125 
 2126 static void
 2127 ip_fini(void *xtp)
 2128 {
 2129 
 2130         callout_stop(&ipport_tick_callout);
 2131 }
 2132 
 2133 /* 
 2134  * The ipport_callout should start running at about the time we attach the
 2135  * inet or inet6 domains.
 2136  */
 2137 static void
 2138 ipport_tick_init(const void *unused __unused)
 2139 {
 2140 
 2141         /* Start ipport_tick. */
 2142         callout_init(&ipport_tick_callout, 1);
 2143         callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL);
 2144         EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL,
 2145                 SHUTDOWN_PRI_DEFAULT);
 2146 }
 2147 SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 
 2148     ipport_tick_init, NULL);
 2149 
 2150 void
 2151 inp_wlock(struct inpcb *inp)
 2152 {
 2153 
 2154         INP_WLOCK(inp);
 2155 }
 2156 
 2157 void
 2158 inp_wunlock(struct inpcb *inp)
 2159 {
 2160 
 2161         INP_WUNLOCK(inp);
 2162 }
 2163 
 2164 void
 2165 inp_rlock(struct inpcb *inp)
 2166 {
 2167 
 2168         INP_RLOCK(inp);
 2169 }
 2170 
 2171 void
 2172 inp_runlock(struct inpcb *inp)
 2173 {
 2174 
 2175         INP_RUNLOCK(inp);
 2176 }
 2177 
 2178 #ifdef INVARIANTS
 2179 void
 2180 inp_lock_assert(struct inpcb *inp)
 2181 {
 2182 
 2183         INP_WLOCK_ASSERT(inp);
 2184 }
 2185 
 2186 void
 2187 inp_unlock_assert(struct inpcb *inp)
 2188 {
 2189 
 2190         INP_UNLOCK_ASSERT(inp);
 2191 }
 2192 #endif
 2193 
 2194 void
 2195 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
 2196 {
 2197         struct inpcb *inp;
 2198 
 2199         INP_INFO_WLOCK(&V_tcbinfo);
 2200         LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
 2201                 INP_WLOCK(inp);
 2202                 func(inp, arg);
 2203                 INP_WUNLOCK(inp);
 2204         }
 2205         INP_INFO_WUNLOCK(&V_tcbinfo);
 2206 }
 2207 
 2208 struct socket *
 2209 inp_inpcbtosocket(struct inpcb *inp)
 2210 {
 2211 
 2212         INP_WLOCK_ASSERT(inp);
 2213         return (inp->inp_socket);
 2214 }
 2215 
 2216 struct tcpcb *
 2217 inp_inpcbtotcpcb(struct inpcb *inp)
 2218 {
 2219 
 2220         INP_WLOCK_ASSERT(inp);
 2221         return ((struct tcpcb *)inp->inp_ppcb);
 2222 }
 2223 
 2224 int
 2225 inp_ip_tos_get(const struct inpcb *inp)
 2226 {
 2227 
 2228         return (inp->inp_ip_tos);
 2229 }
 2230 
 2231 void
 2232 inp_ip_tos_set(struct inpcb *inp, int val)
 2233 {
 2234 
 2235         inp->inp_ip_tos = val;
 2236 }
 2237 
 2238 void
 2239 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
 2240     uint32_t *faddr, uint16_t *fp)
 2241 {
 2242 
 2243         INP_LOCK_ASSERT(inp);
 2244         *laddr = inp->inp_laddr.s_addr;
 2245         *faddr = inp->inp_faddr.s_addr;
 2246         *lp = inp->inp_lport;
 2247         *fp = inp->inp_fport;
 2248 }
 2249 
 2250 struct inpcb *
 2251 so_sotoinpcb(struct socket *so)
 2252 {
 2253 
 2254         return (sotoinpcb(so));
 2255 }
 2256 
 2257 struct tcpcb *
 2258 so_sototcpcb(struct socket *so)
 2259 {
 2260 
 2261         return (sototcpcb(so));
 2262 }
 2263 
 2264 #ifdef DDB
 2265 static void
 2266 db_print_indent(int indent)
 2267 {
 2268         int i;
 2269 
 2270         for (i = 0; i < indent; i++)
 2271                 db_printf(" ");
 2272 }
 2273 
 2274 static void
 2275 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
 2276 {
 2277         char faddr_str[48], laddr_str[48];
 2278 
 2279         db_print_indent(indent);
 2280         db_printf("%s at %p\n", name, inc);
 2281 
 2282         indent += 2;
 2283 
 2284 #ifdef INET6
 2285         if (inc->inc_flags & INC_ISIPV6) {
 2286                 /* IPv6. */
 2287                 ip6_sprintf(laddr_str, &inc->inc6_laddr);
 2288                 ip6_sprintf(faddr_str, &inc->inc6_faddr);
 2289         } else
 2290 #endif
 2291         {
 2292                 /* IPv4. */
 2293                 inet_ntoa_r(inc->inc_laddr, laddr_str);
 2294                 inet_ntoa_r(inc->inc_faddr, faddr_str);
 2295         }
 2296         db_print_indent(indent);
 2297         db_printf("inc_laddr %s   inc_lport %u\n", laddr_str,
 2298             ntohs(inc->inc_lport));
 2299         db_print_indent(indent);
 2300         db_printf("inc_faddr %s   inc_fport %u\n", faddr_str,
 2301             ntohs(inc->inc_fport));
 2302 }
 2303 
 2304 static void
 2305 db_print_inpflags(int inp_flags)
 2306 {
 2307         int comma;
 2308 
 2309         comma = 0;
 2310         if (inp_flags & INP_RECVOPTS) {
 2311                 db_printf("%sINP_RECVOPTS", comma ? ", " : "");
 2312                 comma = 1;
 2313         }
 2314         if (inp_flags & INP_RECVRETOPTS) {
 2315                 db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
 2316                 comma = 1;
 2317         }
 2318         if (inp_flags & INP_RECVDSTADDR) {
 2319                 db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
 2320                 comma = 1;
 2321         }
 2322         if (inp_flags & INP_HDRINCL) {
 2323                 db_printf("%sINP_HDRINCL", comma ? ", " : "");
 2324                 comma = 1;
 2325         }
 2326         if (inp_flags & INP_HIGHPORT) {
 2327                 db_printf("%sINP_HIGHPORT", comma ? ", " : "");
 2328                 comma = 1;
 2329         }
 2330         if (inp_flags & INP_LOWPORT) {
 2331                 db_printf("%sINP_LOWPORT", comma ? ", " : "");
 2332                 comma = 1;
 2333         }
 2334         if (inp_flags & INP_ANONPORT) {
 2335                 db_printf("%sINP_ANONPORT", comma ? ", " : "");
 2336                 comma = 1;
 2337         }
 2338         if (inp_flags & INP_RECVIF) {
 2339                 db_printf("%sINP_RECVIF", comma ? ", " : "");
 2340                 comma = 1;
 2341         }
 2342         if (inp_flags & INP_MTUDISC) {
 2343                 db_printf("%sINP_MTUDISC", comma ? ", " : "");
 2344                 comma = 1;
 2345         }
 2346         if (inp_flags & INP_FAITH) {
 2347                 db_printf("%sINP_FAITH", comma ? ", " : "");
 2348                 comma = 1;
 2349         }
 2350         if (inp_flags & INP_RECVTTL) {
 2351                 db_printf("%sINP_RECVTTL", comma ? ", " : "");
 2352                 comma = 1;
 2353         }
 2354         if (inp_flags & INP_DONTFRAG) {
 2355                 db_printf("%sINP_DONTFRAG", comma ? ", " : "");
 2356                 comma = 1;
 2357         }
 2358         if (inp_flags & INP_RECVTOS) {
 2359                 db_printf("%sINP_RECVTOS", comma ? ", " : "");
 2360                 comma = 1;
 2361         }
 2362         if (inp_flags & IN6P_IPV6_V6ONLY) {
 2363                 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
 2364                 comma = 1;
 2365         }
 2366         if (inp_flags & IN6P_PKTINFO) {
 2367                 db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
 2368                 comma = 1;
 2369         }
 2370         if (inp_flags & IN6P_HOPLIMIT) {
 2371                 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
 2372                 comma = 1;
 2373         }
 2374         if (inp_flags & IN6P_HOPOPTS) {
 2375                 db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
 2376                 comma = 1;
 2377         }
 2378         if (inp_flags & IN6P_DSTOPTS) {
 2379                 db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
 2380                 comma = 1;
 2381         }
 2382         if (inp_flags & IN6P_RTHDR) {
 2383                 db_printf("%sIN6P_RTHDR", comma ? ", " : "");
 2384                 comma = 1;
 2385         }
 2386         if (inp_flags & IN6P_RTHDRDSTOPTS) {
 2387                 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
 2388                 comma = 1;
 2389         }
 2390         if (inp_flags & IN6P_TCLASS) {
 2391                 db_printf("%sIN6P_TCLASS", comma ? ", " : "");
 2392                 comma = 1;
 2393         }
 2394         if (inp_flags & IN6P_AUTOFLOWLABEL) {
 2395                 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
 2396                 comma = 1;
 2397         }
 2398         if (inp_flags & INP_TIMEWAIT) {
 2399                 db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
 2400                 comma  = 1;
 2401         }
 2402         if (inp_flags & INP_ONESBCAST) {
 2403                 db_printf("%sINP_ONESBCAST", comma ? ", " : "");
 2404                 comma  = 1;
 2405         }
 2406         if (inp_flags & INP_DROPPED) {
 2407                 db_printf("%sINP_DROPPED", comma ? ", " : "");
 2408                 comma  = 1;
 2409         }
 2410         if (inp_flags & INP_SOCKREF) {
 2411                 db_printf("%sINP_SOCKREF", comma ? ", " : "");
 2412                 comma  = 1;
 2413         }
 2414         if (inp_flags & IN6P_RFC2292) {
 2415                 db_printf("%sIN6P_RFC2292", comma ? ", " : "");
 2416                 comma = 1;
 2417         }
 2418         if (inp_flags & IN6P_MTU) {
 2419                 db_printf("IN6P_MTU%s", comma ? ", " : "");
 2420                 comma = 1;
 2421         }
 2422 }
 2423 
 2424 static void
 2425 db_print_inpvflag(u_char inp_vflag)
 2426 {
 2427         int comma;
 2428 
 2429         comma = 0;
 2430         if (inp_vflag & INP_IPV4) {
 2431                 db_printf("%sINP_IPV4", comma ? ", " : "");
 2432                 comma  = 1;
 2433         }
 2434         if (inp_vflag & INP_IPV6) {
 2435                 db_printf("%sINP_IPV6", comma ? ", " : "");
 2436                 comma  = 1;
 2437         }
 2438         if (inp_vflag & INP_IPV6PROTO) {
 2439                 db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
 2440                 comma  = 1;
 2441         }
 2442 }
 2443 
 2444 static void
 2445 db_print_inpcb(struct inpcb *inp, const char *name, int indent)
 2446 {
 2447 
 2448         db_print_indent(indent);
 2449         db_printf("%s at %p\n", name, inp);
 2450 
 2451         indent += 2;
 2452 
 2453         db_print_indent(indent);
 2454         db_printf("inp_flow: 0x%x\n", inp->inp_flow);
 2455 
 2456         db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
 2457 
 2458         db_print_indent(indent);
 2459         db_printf("inp_ppcb: %p   inp_pcbinfo: %p   inp_socket: %p\n",
 2460             inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
 2461 
 2462         db_print_indent(indent);
 2463         db_printf("inp_label: %p   inp_flags: 0x%x (",
 2464            inp->inp_label, inp->inp_flags);
 2465         db_print_inpflags(inp->inp_flags);
 2466         db_printf(")\n");
 2467 
 2468         db_print_indent(indent);
 2469         db_printf("inp_sp: %p   inp_vflag: 0x%x (", inp->inp_sp,
 2470             inp->inp_vflag);
 2471         db_print_inpvflag(inp->inp_vflag);
 2472         db_printf(")\n");
 2473 
 2474         db_print_indent(indent);
 2475         db_printf("inp_ip_ttl: %d   inp_ip_p: %d   inp_ip_minttl: %d\n",
 2476             inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
 2477 
 2478         db_print_indent(indent);
 2479 #ifdef INET6
 2480         if (inp->inp_vflag & INP_IPV6) {
 2481                 db_printf("in6p_options: %p   in6p_outputopts: %p   "
 2482                     "in6p_moptions: %p\n", inp->in6p_options,
 2483                     inp->in6p_outputopts, inp->in6p_moptions);
 2484                 db_printf("in6p_icmp6filt: %p   in6p_cksum %d   "
 2485                     "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
 2486                     inp->in6p_hops);
 2487         } else
 2488 #endif
 2489         {
 2490                 db_printf("inp_ip_tos: %d   inp_ip_options: %p   "
 2491                     "inp_ip_moptions: %p\n", inp->inp_ip_tos,
 2492                     inp->inp_options, inp->inp_moptions);
 2493         }
 2494 
 2495         db_print_indent(indent);
 2496         db_printf("inp_phd: %p   inp_gencnt: %ju\n", inp->inp_phd,
 2497             (uintmax_t)inp->inp_gencnt);
 2498 }
 2499 
 2500 DB_SHOW_COMMAND(inpcb, db_show_inpcb)
 2501 {
 2502         struct inpcb *inp;
 2503 
 2504         if (!have_addr) {
 2505                 db_printf("usage: show inpcb <addr>\n");
 2506                 return;
 2507         }
 2508         inp = (struct inpcb *)addr;
 2509 
 2510         db_print_inpcb(inp, "inpcb", 0);
 2511 }
 2512 #endif /* DDB */

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