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.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95
   34  * $FreeBSD$
   35  */
   36 
   37 #include "opt_ipsec.h"
   38 #include "opt_inet6.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/domain.h>
   45 #include <sys/protosw.h>
   46 #include <sys/socket.h>
   47 #include <sys/socketvar.h>
   48 #include <sys/proc.h>
   49 #include <sys/jail.h>
   50 #include <sys/kernel.h>
   51 #include <sys/sysctl.h>
   52 
   53 #include <machine/limits.h>
   54 
   55 #include <vm/vm_zone.h>
   56 
   57 #include <net/if.h>
   58 #include <net/if_types.h>
   59 #include <net/route.h>
   60 
   61 #include <netinet/in.h>
   62 #include <netinet/in_pcb.h>
   63 #include <netinet/in_var.h>
   64 #include <netinet/ip_var.h>
   65 #include <netinet/udp.h>
   66 #include <netinet/udp_var.h>
   67 #ifdef INET6
   68 #include <netinet/ip6.h>
   69 #include <netinet6/ip6_var.h>
   70 #endif /* INET6 */
   71 
   72 #ifdef IPSEC
   73 #include <netinet6/ipsec.h>
   74 #include <netkey/key.h>
   75 #endif /* IPSEC */
   76 
   77 #ifdef FAST_IPSEC
   78 #if defined(IPSEC) || defined(IPSEC_ESP)
   79 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
   80 #endif
   81 
   82 #include <netipsec/ipsec.h>
   83 #include <netipsec/key.h>
   84 #define IPSEC
   85 #endif /* FAST_IPSEC */
   86 
   87 struct  in_addr zeroin_addr;
   88 
   89 /*
   90  * These configure the range of local port addresses assigned to
   91  * "unspecified" outgoing connections/packets/whatever.
   92  */
   93 int     ipport_lowfirstauto  = IPPORT_RESERVED - 1;     /* 1023 */
   94 int     ipport_lowlastauto = IPPORT_RESERVEDSTART;      /* 600 */
   95 int     ipport_firstauto = IPPORT_RESERVED;             /* 1024 */
   96 int     ipport_lastauto  = IPPORT_USERRESERVED;         /* 5000 */
   97 int     ipport_hifirstauto = IPPORT_HIFIRSTAUTO;        /* 49152 */
   98 int     ipport_hilastauto  = IPPORT_HILASTAUTO;         /* 65535 */
   99 
  100 /* Variables dealing with random ephemeral port allocation. */
  101 int     ipport_randomized = 1;  /* user controlled via sysctl */
  102 int     ipport_randomcps = 10;  /* user controlled via sysctl */
  103 int     ipport_randomtime = 45; /* user controlled via sysctl */
  104 int     ipport_stoprandom = 0;  /* toggled by ipport_tick */
  105 int     ipport_tcpallocs;
  106 int     ipport_tcplastcount;
  107 
  108 #define RANGECHK(var, min, max) \
  109         if ((var) < (min)) { (var) = (min); } \
  110         else if ((var) > (max)) { (var) = (max); }
  111 
  112 static int
  113 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
  114 {
  115         int error = sysctl_handle_int(oidp,
  116                 oidp->oid_arg1, oidp->oid_arg2, req);
  117         if (!error) {
  118                 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
  119                 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
  120                 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
  121                 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
  122                 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
  123                 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
  124         }
  125         return error;
  126 }
  127 
  128 #undef RANGECHK
  129 
  130 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
  131 
  132 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
  133            &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
  134 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
  135            &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
  136 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
  137            &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
  138 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
  139            &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
  140 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
  141            &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
  142 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
  143            &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
  144 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
  145            &ipport_randomized, 0, "");
  146 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomcps,
  147           CTLFLAG_RW, &ipport_randomcps, 0, "");
  148 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomtime,
  149           CTLFLAG_RW, &ipport_randomtime, 0, "");
  150 
  151 /*
  152  * in_pcb.c: manage the Protocol Control Blocks.
  153  *
  154  * NOTE: It is assumed that most of these functions will be called at
  155  * splnet(). XXX - There are, unfortunately, a few exceptions to this
  156  * rule that should be fixed.
  157  */
  158 
  159 /*
  160  * Allocate a PCB and associate it with the socket.
  161  */
  162 int
  163 in_pcballoc(so, pcbinfo, p)
  164         struct socket *so;
  165         struct inpcbinfo *pcbinfo;
  166         struct proc *p;
  167 {
  168         register struct inpcb *inp;
  169 #ifdef IPSEC
  170         int error;
  171 #endif
  172 
  173         inp = zalloci(pcbinfo->ipi_zone);
  174         if (inp == NULL)
  175                 return (ENOBUFS);
  176         bzero((caddr_t)inp, sizeof(*inp));
  177         inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
  178         inp->inp_pcbinfo = pcbinfo;
  179         inp->inp_socket = so;
  180 #ifdef IPSEC
  181         error = ipsec_init_policy(so, &inp->inp_sp);
  182         if (error != 0) {
  183                 zfreei(pcbinfo->ipi_zone, inp);
  184                 return error;
  185         }
  186 #endif /*IPSEC*/
  187 #if defined(INET6)
  188         if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only)
  189                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
  190 #endif
  191         LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
  192         pcbinfo->ipi_count++;
  193         so->so_pcb = (caddr_t)inp;
  194 #ifdef INET6
  195         if (ip6_auto_flowlabel)
  196                 inp->inp_flags |= IN6P_AUTOFLOWLABEL;
  197 #endif
  198         return (0);
  199 }
  200 
  201 int
  202 in_pcbbind(inp, nam, p)
  203         register struct inpcb *inp;
  204         struct sockaddr *nam;
  205         struct proc *p;
  206 {
  207         register struct socket *so = inp->inp_socket;
  208         unsigned short *lastport;
  209         struct sockaddr_in *sin;
  210         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
  211         u_short lport = 0;
  212         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
  213         int error, prison = 0;
  214         int dorandom;
  215 
  216         if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
  217                 return (EADDRNOTAVAIL);
  218         if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY)
  219                 return (EINVAL);
  220         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
  221                 wild = 1;
  222         if (nam) {
  223                 sin = (struct sockaddr_in *)nam;
  224                 if (nam->sa_len != sizeof (*sin))
  225                         return (EINVAL);
  226 #ifdef notdef
  227                 /*
  228                  * We should check the family, but old programs
  229                  * incorrectly fail to initialize it.
  230                  */
  231                 if (sin->sin_family != AF_INET)
  232                         return (EAFNOSUPPORT);
  233 #endif
  234                 if (sin->sin_addr.s_addr != INADDR_ANY)
  235                         if (prison_ip(p, 0, &sin->sin_addr.s_addr))
  236                                 return(EINVAL);
  237                 lport = sin->sin_port;
  238                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
  239                         /*
  240                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
  241                          * allow complete duplication of binding if
  242                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
  243                          * and a multicast address is bound on both
  244                          * new and duplicated sockets.
  245                          */
  246                         if (so->so_options & SO_REUSEADDR)
  247                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
  248                 } else if (sin->sin_addr.s_addr != INADDR_ANY) {
  249                         sin->sin_port = 0;              /* yech... */
  250                         bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  251                         if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
  252                                 return (EADDRNOTAVAIL);
  253                 }
  254                 if (lport) {
  255                         struct inpcb *t;
  256 
  257                         /* GROSS */
  258                         if (ntohs(lport) < IPPORT_RESERVED && p &&
  259                             suser_xxx(0, p, PRISON_ROOT))
  260                                 return (EACCES);
  261                         if (p && p->p_prison)
  262                                 prison = 1;
  263                         if (so->so_cred->cr_uid != 0 &&
  264                             !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
  265                                 t = in_pcblookup_local(inp->inp_pcbinfo,
  266                                     sin->sin_addr, lport,
  267                                     prison ? 0 :  INPLOOKUP_WILDCARD);
  268                                 if (t &&
  269                                     (so->so_type != SOCK_STREAM ||
  270                                      ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
  271                                     (ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
  272                                      ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
  273                                      (t->inp_socket->so_options &
  274                                          SO_REUSEPORT) == 0) &&
  275                                     (so->so_cred->cr_uid !=
  276                                      t->inp_socket->so_cred->cr_uid))
  277                                         return (EADDRINUSE);
  278                         }
  279                         if (prison &&
  280                             prison_ip(p, 0, &sin->sin_addr.s_addr))
  281                                 return (EADDRNOTAVAIL);
  282                         t = in_pcblookup_local(pcbinfo, sin->sin_addr,
  283                             lport, prison ? 0 : wild);
  284                         if (t &&
  285                             (reuseport & t->inp_socket->so_options) == 0) {
  286 #if defined(INET6)
  287                                 if (ntohl(sin->sin_addr.s_addr) !=
  288                                     INADDR_ANY ||
  289                                     ntohl(t->inp_laddr.s_addr) !=
  290                                     INADDR_ANY ||
  291                                     INP_SOCKAF(so) ==
  292                                     INP_SOCKAF(t->inp_socket))
  293 #endif /* defined(INET6) */
  294                                 return (EADDRINUSE);
  295                         }
  296                 }
  297                 inp->inp_laddr = sin->sin_addr;
  298         }
  299         if (lport == 0) {
  300                 ushort first, last;
  301                 int count;
  302 
  303                 if (inp->inp_laddr.s_addr != INADDR_ANY)
  304                         if (prison_ip(p, 0, &inp->inp_laddr.s_addr )) {
  305                                 inp->inp_laddr.s_addr = INADDR_ANY;
  306                                 return (EINVAL);
  307                         }
  308                 inp->inp_flags |= INP_ANONPORT;
  309 
  310                 if (inp->inp_flags & INP_HIGHPORT) {
  311                         first = ipport_hifirstauto;     /* sysctl */
  312                         last  = ipport_hilastauto;
  313                         lastport = &pcbinfo->lasthi;
  314                 } else if (inp->inp_flags & INP_LOWPORT) {
  315                         if (p && (error = suser_xxx(0, p, PRISON_ROOT))) {
  316                                 inp->inp_laddr.s_addr = INADDR_ANY;
  317                                 return error;
  318                         }
  319                         first = ipport_lowfirstauto;    /* 1023 */
  320                         last  = ipport_lowlastauto;     /* 600 */
  321                         lastport = &pcbinfo->lastlow;
  322                 } else {
  323                         first = ipport_firstauto;       /* sysctl */
  324                         last  = ipport_lastauto;
  325                         lastport = &pcbinfo->lastport;
  326                 }
  327                 /*
  328                 * For UDP, use random port allocation as long as the user
  329                 * allows it.  For TCP (and as of yet unknown) connections,
  330                 * use random port allocation only if the user allows it AND
  331                 * ipport_tick allows it.
  332                 */
  333                 if (ipport_randomized &&
  334                         (!ipport_stoprandom || pcbinfo == &udbinfo))
  335                         dorandom = 1;
  336                 else
  337                         dorandom = 0;
  338                 /* Make sure to not include UDP packets in the count. */
  339                 if (pcbinfo != &udbinfo)
  340                         ipport_tcpallocs++;
  341                 /*
  342                  * Simple check to ensure all ports are not used up causing
  343                  * a deadlock here.
  344                  *
  345                  * We split the two cases (up and down) so that the direction
  346                  * is not being tested on each round of the loop.
  347                  */
  348                 if (first > last) {
  349                         /*
  350                          * counting down
  351                          */
  352                         if (dorandom)
  353                                 *lastport = first -
  354                                             (arc4random() % (first - last));
  355                         count = first - last;
  356 
  357                         do {
  358                                 if (count-- < 0) {      /* completely used? */
  359                                         inp->inp_laddr.s_addr = INADDR_ANY;
  360                                         return (EADDRNOTAVAIL);
  361                                 }
  362                                 --*lastport;
  363                                 if (*lastport > first || *lastport < last)
  364                                         *lastport = first;
  365                                 lport = htons(*lastport);
  366                         } while (in_pcblookup_local(pcbinfo,
  367                                  inp->inp_laddr, lport, wild));
  368                 } else {
  369                         /*
  370                          * counting up
  371                          */
  372                         if (dorandom)
  373                                 *lastport = first +
  374                                             (arc4random() % (last - first));
  375                         count = last - first;
  376 
  377                         do {
  378                                 if (count-- < 0) {      /* completely used? */
  379                                         inp->inp_laddr.s_addr = INADDR_ANY;
  380                                         return (EADDRNOTAVAIL);
  381                                 }
  382                                 ++*lastport;
  383                                 if (*lastport < first || *lastport > last)
  384                                         *lastport = first;
  385                                 lport = htons(*lastport);
  386                         } while (in_pcblookup_local(pcbinfo,
  387                                  inp->inp_laddr, lport, wild));
  388                 }
  389         }
  390         inp->inp_lport = lport;
  391         if (prison_ip(p, 0, &inp->inp_laddr.s_addr)) {
  392                 inp->inp_laddr.s_addr = INADDR_ANY;
  393                 inp->inp_lport = 0;
  394                 return (EINVAL);
  395         }
  396         if (in_pcbinshash(inp) != 0) {
  397                 inp->inp_laddr.s_addr = INADDR_ANY;
  398                 inp->inp_lport = 0;
  399                 return (EAGAIN);
  400         }
  401         return (0);
  402 }
  403 
  404 /*
  405  *   Transform old in_pcbconnect() into an inner subroutine for new
  406  *   in_pcbconnect(): Do some validity-checking on the remote
  407  *   address (in mbuf 'nam') and then determine local host address
  408  *   (i.e., which interface) to use to access that remote host.
  409  *
  410  *   This preserves definition of in_pcbconnect(), while supporting a
  411  *   slightly different version for T/TCP.  (This is more than
  412  *   a bit of a kludge, but cleaning up the internal interfaces would
  413  *   have forced minor changes in every protocol).
  414  */
  415 
  416 int
  417 in_pcbladdr(inp, nam, plocal_sin)
  418         register struct inpcb *inp;
  419         struct sockaddr *nam;
  420         struct sockaddr_in **plocal_sin;
  421 {
  422         struct in_ifaddr *ia;
  423         register struct sockaddr_in *sin = (struct sockaddr_in *)nam;
  424 
  425         if (nam->sa_len != sizeof (*sin))
  426                 return (EINVAL);
  427         if (sin->sin_family != AF_INET)
  428                 return (EAFNOSUPPORT);
  429         if (sin->sin_port == 0)
  430                 return (EADDRNOTAVAIL);
  431         if (!TAILQ_EMPTY(&in_ifaddrhead)) {
  432                 /*
  433                  * If the destination address is INADDR_ANY,
  434                  * use the primary local address.
  435                  * If the supplied address is INADDR_BROADCAST,
  436                  * and the primary interface supports broadcast,
  437                  * choose the broadcast address for that interface.
  438                  */
  439                 if (sin->sin_addr.s_addr == INADDR_ANY)
  440                     sin->sin_addr = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr;
  441                 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
  442                   (TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags & IFF_BROADCAST))
  443                     sin->sin_addr = satosin(&TAILQ_FIRST(&in_ifaddrhead)->ia_broadaddr)->sin_addr;
  444         }
  445         if (inp->inp_laddr.s_addr == INADDR_ANY) {
  446                 register struct route *ro;
  447 
  448                 ia = (struct in_ifaddr *)0;
  449                 /*
  450                  * If route is known or can be allocated now,
  451                  * our src addr is taken from the i/f, else punt.
  452                  * Note that we should check the address family of the cached
  453                  * destination, in case of sharing the cache with IPv6.
  454                  */
  455                 ro = &inp->inp_route;
  456                 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
  457                     ro->ro_dst.sa_family != AF_INET ||
  458                     satosin(&ro->ro_dst)->sin_addr.s_addr !=
  459                     sin->sin_addr.s_addr ||
  460                     inp->inp_socket->so_options & SO_DONTROUTE)) {
  461                         RTFREE(ro->ro_rt);
  462                         ro->ro_rt = (struct rtentry *)0;
  463                 }
  464                 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
  465                     (ro->ro_rt == (struct rtentry *)0 ||
  466                     ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
  467                         /* No route yet, so try to acquire one */
  468                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
  469                         ro->ro_dst.sa_family = AF_INET;
  470                         ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
  471                         ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
  472                                 sin->sin_addr;
  473                         rtalloc(ro);
  474                 }
  475                 /*
  476                  * If we found a route, use the address
  477                  * corresponding to the outgoing interface
  478                  * unless it is the loopback (in case a route
  479                  * to our address on another net goes to loopback).
  480                  */
  481                 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
  482                         ia = ifatoia(ro->ro_rt->rt_ifa);
  483                 if (ia == 0) {
  484                         u_short fport = sin->sin_port;
  485 
  486                         sin->sin_port = 0;
  487                         ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
  488                         if (ia == 0)
  489                                 ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
  490                         sin->sin_port = fport;
  491                         if (ia == 0)
  492                                 ia = TAILQ_FIRST(&in_ifaddrhead);
  493                         if (ia == 0)
  494                                 return (EADDRNOTAVAIL);
  495                 }
  496                 /*
  497                  * If the destination address is multicast and an outgoing
  498                  * interface has been set as a multicast option, use the
  499                  * address of that interface as our source address.
  500                  */
  501                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
  502                     inp->inp_moptions != NULL) {
  503                         struct ip_moptions *imo;
  504                         struct ifnet *ifp;
  505 
  506                         imo = inp->inp_moptions;
  507                         if (imo->imo_multicast_ifp != NULL) {
  508                                 ifp = imo->imo_multicast_ifp;
  509                                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
  510                                         if (ia->ia_ifp == ifp)
  511                                                 break;
  512                                 if (ia == 0)
  513                                         return (EADDRNOTAVAIL);
  514                         }
  515                 }
  516         /*
  517          * Don't do pcblookup call here; return interface in plocal_sin
  518          * and exit to caller, that will do the lookup.
  519          */
  520                 *plocal_sin = &ia->ia_addr;
  521 
  522         }
  523         return(0);
  524 }
  525 
  526 /*
  527  * Outer subroutine:
  528  * Connect from a socket to a specified address.
  529  * Both address and port must be specified in argument sin.
  530  * If don't have a local address for this socket yet,
  531  * then pick one.
  532  */
  533 int
  534 in_pcbconnect(inp, nam, p)
  535         register struct inpcb *inp;
  536         struct sockaddr *nam;
  537         struct proc *p;
  538 {
  539         struct sockaddr_in *ifaddr;
  540         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
  541         struct sockaddr_in sa;
  542         int error;
  543 
  544         if (inp->inp_laddr.s_addr == INADDR_ANY && p->p_prison != NULL) {
  545                 bzero(&sa, sizeof (sa));
  546                 sa.sin_addr.s_addr = htonl(p->p_prison->pr_ip);
  547                 sa.sin_len=sizeof (sa);
  548                 sa.sin_family = AF_INET;
  549                 error = in_pcbbind(inp, (struct sockaddr *)&sa, p);
  550                 if (error)
  551                         return (error);
  552         }
  553         /*
  554          *   Call inner routine, to assign local interface address.
  555          */
  556         if ((error = in_pcbladdr(inp, nam, &ifaddr)) != 0)
  557                 return(error);
  558 
  559         if (in_pcblookup_hash(inp->inp_pcbinfo, sin->sin_addr, sin->sin_port,
  560             inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
  561             inp->inp_lport, 0, NULL) != NULL) {
  562                 return (EADDRINUSE);
  563         }
  564         if (inp->inp_laddr.s_addr == INADDR_ANY) {
  565                 if (inp->inp_lport == 0) {
  566                         error = in_pcbbind(inp, (struct sockaddr *)0, p);
  567                         if (error)
  568                             return (error);
  569                 }
  570                 inp->inp_laddr = ifaddr->sin_addr;
  571         }
  572         inp->inp_faddr = sin->sin_addr;
  573         inp->inp_fport = sin->sin_port;
  574         in_pcbrehash(inp);
  575         return (0);
  576 }
  577 
  578 void
  579 in_pcbdisconnect(inp)
  580         struct inpcb *inp;
  581 {
  582 
  583         inp->inp_faddr.s_addr = INADDR_ANY;
  584         inp->inp_fport = 0;
  585         in_pcbrehash(inp);
  586         if (inp->inp_socket->so_state & SS_NOFDREF)
  587                 in_pcbdetach(inp);
  588 }
  589 
  590 void
  591 in_pcbdetach(inp)
  592         struct inpcb *inp;
  593 {
  594         struct socket *so = inp->inp_socket;
  595         struct inpcbinfo *ipi = inp->inp_pcbinfo;
  596 
  597 #ifdef IPSEC
  598         ipsec4_delete_pcbpolicy(inp);
  599 #endif /*IPSEC*/
  600         inp->inp_gencnt = ++ipi->ipi_gencnt;
  601         in_pcbremlists(inp);
  602         so->so_pcb = 0;
  603         sofree(so);
  604         if (inp->inp_options)
  605                 (void)m_free(inp->inp_options);
  606         if (inp->inp_route.ro_rt)
  607                 rtfree(inp->inp_route.ro_rt);
  608         ip_freemoptions(inp->inp_moptions);
  609         inp->inp_vflag = 0;
  610         zfreei(ipi->ipi_zone, inp);
  611 }
  612 
  613 /*
  614  * The calling convention of in_setsockaddr() and in_setpeeraddr() was
  615  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
  616  * in struct pr_usrreqs, so that protocols can just reference then directly
  617  * without the need for a wrapper function.  The socket must have a valid
  618  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
  619  * except through a kernel programming error, so it is acceptable to panic
  620  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
  621  * because there actually /is/ a programming error somewhere... XXX)
  622  */
  623 int
  624 in_setsockaddr(so, nam)
  625         struct socket *so;
  626         struct sockaddr **nam;
  627 {
  628         int s;
  629         register struct inpcb *inp;
  630         register struct sockaddr_in *sin;
  631 
  632         /*
  633          * Do the malloc first in case it blocks.
  634          */
  635         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
  636                 M_WAITOK | M_ZERO);
  637         sin->sin_family = AF_INET;
  638         sin->sin_len = sizeof(*sin);
  639 
  640         s = splnet();
  641         inp = sotoinpcb(so);
  642         if (!inp) {
  643                 splx(s);
  644                 free(sin, M_SONAME);
  645                 return ECONNRESET;
  646         }
  647         sin->sin_port = inp->inp_lport;
  648         sin->sin_addr = inp->inp_laddr;
  649         splx(s);
  650 
  651         *nam = (struct sockaddr *)sin;
  652         return 0;
  653 }
  654 
  655 int
  656 in_setpeeraddr(so, nam)
  657         struct socket *so;
  658         struct sockaddr **nam;
  659 {
  660         int s;
  661         struct inpcb *inp;
  662         register struct sockaddr_in *sin;
  663 
  664         /*
  665          * Do the malloc first in case it blocks.
  666          */
  667         MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
  668                 M_WAITOK | M_ZERO);
  669         sin->sin_family = AF_INET;
  670         sin->sin_len = sizeof(*sin);
  671 
  672         s = splnet();
  673         inp = sotoinpcb(so);
  674         if (!inp) {
  675                 splx(s);
  676                 free(sin, M_SONAME);
  677                 return ECONNRESET;
  678         }
  679         sin->sin_port = inp->inp_fport;
  680         sin->sin_addr = inp->inp_faddr;
  681         splx(s);
  682 
  683         *nam = (struct sockaddr *)sin;
  684         return 0;
  685 }
  686 
  687 void
  688 in_pcbnotifyall(head, faddr, errno, notify)
  689         struct inpcbhead *head;
  690         struct in_addr faddr;
  691         void (*notify) __P((struct inpcb *, int));
  692 {
  693         struct inpcb *inp, *ninp;
  694         int s;
  695 
  696         s = splnet();
  697         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
  698                 ninp = LIST_NEXT(inp, inp_list);
  699 #ifdef INET6
  700                 if ((inp->inp_vflag & INP_IPV4) == 0)
  701                         continue;
  702 #endif
  703                 if (inp->inp_faddr.s_addr != faddr.s_addr ||
  704                     inp->inp_socket == NULL)
  705                                 continue;
  706                 (*notify)(inp, errno);
  707         }
  708         splx(s);
  709 }
  710 
  711 void
  712 in_pcbpurgeif0(head, ifp)
  713         struct inpcb *head;
  714         struct ifnet *ifp;
  715 {
  716         struct inpcb *inp;
  717         struct ip_moptions *imo;
  718         int i, gap;
  719 
  720         for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
  721                 imo = inp->inp_moptions;
  722                 if ((inp->inp_vflag & INP_IPV4) &&
  723                     imo != NULL) {
  724                         /*
  725                          * Unselect the outgoing interface if it is being
  726                          * detached.
  727                          */
  728                         if (imo->imo_multicast_ifp == ifp)
  729                                 imo->imo_multicast_ifp = NULL;
  730 
  731                         /*
  732                          * Drop multicast group membership if we joined
  733                          * through the interface being detached.
  734                          */
  735                         for (i = 0, gap = 0; i < imo->imo_num_memberships;
  736                             i++) {
  737                                 if (imo->imo_membership[i]->inm_ifp == ifp) {
  738                                         in_delmulti(imo->imo_membership[i]);
  739                                         gap++;
  740                                 } else if (gap != 0)
  741                                         imo->imo_membership[i - gap] =
  742                                             imo->imo_membership[i];
  743                         }
  744                         imo->imo_num_memberships -= gap;
  745                 }
  746         }
  747 }
  748 
  749 /*
  750  * Check for alternatives when higher level complains
  751  * about service problems.  For now, invalidate cached
  752  * routing information.  If the route was created dynamically
  753  * (by a redirect), time to try a default gateway again.
  754  */
  755 void
  756 in_losing(inp)
  757         struct inpcb *inp;
  758 {
  759         register struct rtentry *rt;
  760         struct rt_addrinfo info;
  761 
  762         if ((rt = inp->inp_route.ro_rt)) {
  763                 bzero((caddr_t)&info, sizeof(info));
  764                 info.rti_flags = rt->rt_flags;
  765                 info.rti_info[RTAX_DST] = rt_key(rt);
  766                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  767                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
  768                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
  769                 if (rt->rt_flags & RTF_DYNAMIC)
  770                         (void) rtrequest1(RTM_DELETE, &info, NULL);
  771                 inp->inp_route.ro_rt = NULL;
  772                 rtfree(rt);
  773                 /*
  774                  * A new route can be allocated
  775                  * the next time output is attempted.
  776                  */
  777         }
  778 }
  779 
  780 /*
  781  * After a routing change, flush old routing
  782  * and allocate a (hopefully) better one.
  783  */
  784 void
  785 in_rtchange(inp, errno)
  786         register struct inpcb *inp;
  787         int errno;
  788 {
  789         if (inp->inp_route.ro_rt) {
  790                 rtfree(inp->inp_route.ro_rt);
  791                 inp->inp_route.ro_rt = 0;
  792                 /*
  793                  * A new route can be allocated the next time
  794                  * output is attempted.
  795                  */
  796         }
  797 }
  798 
  799 /*
  800  * Lookup a PCB based on the local address and port.
  801  */
  802 #define INP_LOOKUP_MAPPED_PCB_COST      3
  803 struct inpcb *
  804 in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
  805         struct inpcbinfo *pcbinfo;
  806         struct in_addr laddr;
  807         u_int lport_arg;
  808         int wild_okay;
  809 {
  810         register struct inpcb *inp;
  811 #ifdef INET6
  812         int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
  813 #else
  814         int matchwild = 3;
  815 #endif
  816         int wildcard;
  817         u_short lport = lport_arg;
  818 
  819         if (!wild_okay) {
  820                 struct inpcbhead *head;
  821                 /*
  822                  * Look for an unconnected (wildcard foreign addr) PCB that
  823                  * matches the local address and port we're looking for.
  824                  */
  825                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
  826                 LIST_FOREACH(inp, head, inp_hash) {
  827 #ifdef INET6
  828                         if ((inp->inp_vflag & INP_IPV4) == 0)
  829                                 continue;
  830 #endif
  831                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
  832                             inp->inp_laddr.s_addr == laddr.s_addr &&
  833                             inp->inp_lport == lport) {
  834                                 /*
  835                                  * Found.
  836                                  */
  837                                 return (inp);
  838                         }
  839                 }
  840                 /*
  841                  * Not found.
  842                  */
  843                 return (NULL);
  844         } else {
  845                 struct inpcbporthead *porthash;
  846                 struct inpcbport *phd;
  847                 struct inpcb *match = NULL;
  848                 /*
  849                  * Best fit PCB lookup.
  850                  *
  851                  * First see if this local port is in use by looking on the
  852                  * port hash list.
  853                  */
  854                 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
  855                     pcbinfo->porthashmask)];
  856                 LIST_FOREACH(phd, porthash, phd_hash) {
  857                         if (phd->phd_port == lport)
  858                                 break;
  859                 }
  860                 if (phd != NULL) {
  861                         /*
  862                          * Port is in use by one or more PCBs. Look for best
  863                          * fit.
  864                          */
  865                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
  866                                 wildcard = 0;
  867 #ifdef INET6
  868                                 if ((inp->inp_vflag & INP_IPV4) == 0)
  869                                         continue;
  870                                 /*
  871                                  * We never select the PCB that has
  872                                  * INP_IPV6 flag and is bound to :: if
  873                                  * we have another PCB which is bound
  874                                  * to 0.0.0.0.  If a PCB has the
  875                                  * INP_IPV6 flag, then we set its cost
  876                                  * higher than IPv4 only PCBs.
  877                                  *
  878                                  * Note that the case only happens
  879                                  * when a socket is bound to ::, under
  880                                  * the condition that the use of the
  881                                  * mapped address is allowed.
  882                                  */
  883                                 if ((inp->inp_vflag & INP_IPV6) != 0)
  884                                         wildcard += INP_LOOKUP_MAPPED_PCB_COST;
  885 #endif
  886                                 if (inp->inp_faddr.s_addr != INADDR_ANY)
  887                                         wildcard++;
  888                                 if (inp->inp_laddr.s_addr != INADDR_ANY) {
  889                                         if (laddr.s_addr == INADDR_ANY)
  890                                                 wildcard++;
  891                                         else if (inp->inp_laddr.s_addr != laddr.s_addr)
  892                                                 continue;
  893                                 } else {
  894                                         if (laddr.s_addr != INADDR_ANY)
  895                                                 wildcard++;
  896                                 }
  897                                 if (wildcard < matchwild) {
  898                                         match = inp;
  899                                         matchwild = wildcard;
  900                                         if (matchwild == 0) {
  901                                                 break;
  902                                         }
  903                                 }
  904                         }
  905                 }
  906                 return (match);
  907         }
  908 }
  909 #undef INP_LOOKUP_MAPPED_PCB_COST
  910 
  911 /*
  912  * Lookup PCB in hash list.
  913  */
  914 struct inpcb *
  915 in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard,
  916                   ifp)
  917         struct inpcbinfo *pcbinfo;
  918         struct in_addr faddr, laddr;
  919         u_int fport_arg, lport_arg;
  920         int wildcard;
  921         struct ifnet *ifp;
  922 {
  923         struct inpcbhead *head;
  924         register struct inpcb *inp;
  925         u_short fport = fport_arg, lport = lport_arg;
  926 
  927         /*
  928          * First look for an exact match.
  929          */
  930         head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)];
  931         LIST_FOREACH(inp, head, inp_hash) {
  932 #ifdef INET6
  933                 if ((inp->inp_vflag & INP_IPV4) == 0)
  934                         continue;
  935 #endif
  936                 if (inp->inp_faddr.s_addr == faddr.s_addr &&
  937                     inp->inp_laddr.s_addr == laddr.s_addr &&
  938                     inp->inp_fport == fport &&
  939                     inp->inp_lport == lport) {
  940                         /*
  941                          * Found.
  942                          */
  943                         return (inp);
  944                 }
  945         }
  946         if (wildcard) {
  947                 struct inpcb *local_wild = NULL;
  948 #if defined(INET6)
  949                 struct inpcb *local_wild_mapped = NULL;
  950 #endif /* defined(INET6) */
  951 
  952                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
  953                 LIST_FOREACH(inp, head, inp_hash) {
  954 #ifdef INET6
  955                         if ((inp->inp_vflag & INP_IPV4) == 0)
  956                                 continue;
  957 #endif
  958                         if (inp->inp_faddr.s_addr == INADDR_ANY &&
  959                             inp->inp_lport == lport) {
  960                                 if (ifp && ifp->if_type == IFT_FAITH &&
  961                                     (inp->inp_flags & INP_FAITH) == 0)
  962                                         continue;
  963                                 if (inp->inp_laddr.s_addr == laddr.s_addr)
  964                                         return (inp);
  965                                 else if (inp->inp_laddr.s_addr == INADDR_ANY) {
  966 #if defined(INET6)
  967                                         if (INP_CHECK_SOCKAF(inp->inp_socket,
  968                                                              AF_INET6))
  969                                                 local_wild_mapped = inp;
  970                                         else
  971 #endif /* defined(INET6) */
  972                                         local_wild = inp;
  973                                 }
  974                         }
  975                 }
  976 #if defined(INET6)
  977                 if (local_wild == NULL)
  978                         return (local_wild_mapped);
  979 #endif /* defined(INET6) */
  980                 return (local_wild);
  981         }
  982 
  983         /*
  984          * Not found.
  985          */
  986         return (NULL);
  987 }
  988 
  989 /*
  990  * Insert PCB onto various hash lists.
  991  */
  992 int
  993 in_pcbinshash(inp)
  994         struct inpcb *inp;
  995 {
  996         struct inpcbhead *pcbhash;
  997         struct inpcbporthead *pcbporthash;
  998         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
  999         struct inpcbport *phd;
 1000         u_int32_t hashkey_faddr;
 1001 
 1002 #ifdef INET6
 1003         if (inp->inp_vflag & INP_IPV6)
 1004                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
 1005         else
 1006 #endif /* INET6 */
 1007         hashkey_faddr = inp->inp_faddr.s_addr;
 1008 
 1009         pcbhash = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
 1010                  inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
 1011 
 1012         pcbporthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(inp->inp_lport,
 1013             pcbinfo->porthashmask)];
 1014 
 1015         /*
 1016          * Go through port list and look for a head for this lport.
 1017          */
 1018         LIST_FOREACH(phd, pcbporthash, phd_hash) {
 1019                 if (phd->phd_port == inp->inp_lport)
 1020                         break;
 1021         }
 1022         /*
 1023          * If none exists, malloc one and tack it on.
 1024          */
 1025         if (phd == NULL) {
 1026                 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT);
 1027                 if (phd == NULL) {
 1028                         return (ENOBUFS); /* XXX */
 1029                 }
 1030                 phd->phd_port = inp->inp_lport;
 1031                 LIST_INIT(&phd->phd_pcblist);
 1032                 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
 1033         }
 1034         inp->inp_phd = phd;
 1035         LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
 1036         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
 1037         return (0);
 1038 }
 1039 
 1040 /*
 1041  * Move PCB to the proper hash bucket when { faddr, fport } have  been
 1042  * changed. NOTE: This does not handle the case of the lport changing (the
 1043  * hashed port list would have to be updated as well), so the lport must
 1044  * not change after in_pcbinshash() has been called.
 1045  */
 1046 void
 1047 in_pcbrehash(inp)
 1048         struct inpcb *inp;
 1049 {
 1050         struct inpcbhead *head;
 1051         u_int32_t hashkey_faddr;
 1052 
 1053 #ifdef INET6
 1054         if (inp->inp_vflag & INP_IPV6)
 1055                 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
 1056         else
 1057 #endif /* INET6 */
 1058         hashkey_faddr = inp->inp_faddr.s_addr;
 1059 
 1060         head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
 1061                 inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];
 1062 
 1063         LIST_REMOVE(inp, inp_hash);
 1064         LIST_INSERT_HEAD(head, inp, inp_hash);
 1065 }
 1066 
 1067 /*
 1068  * Remove PCB from various lists.
 1069  */
 1070 void
 1071 in_pcbremlists(inp)
 1072         struct inpcb *inp;
 1073 {
 1074         inp->inp_gencnt = ++inp->inp_pcbinfo->ipi_gencnt;
 1075         if (inp->inp_lport) {
 1076                 struct inpcbport *phd = inp->inp_phd;
 1077 
 1078                 LIST_REMOVE(inp, inp_hash);
 1079                 LIST_REMOVE(inp, inp_portlist);
 1080                 if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
 1081                         LIST_REMOVE(phd, phd_hash);
 1082                         free(phd, M_PCB);
 1083                 }
 1084         }
 1085         LIST_REMOVE(inp, inp_list);
 1086         inp->inp_pcbinfo->ipi_count--;
 1087 }
 1088 
 1089 int
 1090 prison_xinpcb(struct proc *p, struct inpcb *inp)
 1091 {
 1092         if (!p->p_prison)
 1093                 return (0);
 1094         if (ntohl(inp->inp_laddr.s_addr) == p->p_prison->pr_ip)
 1095                 return (0);
 1096         return (1);
 1097 }
 1098 
 1099 /*
 1100  * ipport_tick runs once per second, determining if random port
 1101  * allocation should be continued.  If more than ipport_randomcps
 1102  * ports have been allocated in the last second, then we return to
 1103  * sequential port allocation. We return to random allocation only
 1104  * once we drop below ipport_randomcps for at least 5 seconds.
 1105  */
 1106 
 1107 void
 1108 ipport_tick(xtp)
 1109         void *xtp;
 1110 {
 1111         if (ipport_tcpallocs > ipport_tcplastcount + ipport_randomcps) {
 1112                 ipport_stoprandom = ipport_randomtime;
 1113         } else {
 1114                 if (ipport_stoprandom > 0)
 1115                         ipport_stoprandom--;
 1116         }
 1117         ipport_tcplastcount = ipport_tcpallocs;
 1118         callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
 1119 }

Cache object: e7384b172247e7390b3d2dcf81d27357


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