udp6_usrreq.c

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    1 /*      $NetBSD: udp6_usrreq.c,v 1.67 2005/03/11 06:16:16 atatat Exp $  */
    2 /*      $KAME: udp6_usrreq.c,v 1.86 2001/05/27 17:33:00 itojun Exp $    */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * Copyright (c) 1982, 1986, 1989, 1993
   35  *      The Regents of the University of California.  All rights reserved.
   36  *
   37  * Redistribution and use in source and binary forms, with or without
   38  * modification, are permitted provided that the following conditions
   39  * are met:
   40  * 1. Redistributions of source code must retain the above copyright
   41  *    notice, this list of conditions and the following disclaimer.
   42  * 2. Redistributions in binary form must reproduce the above copyright
   43  *    notice, this list of conditions and the following disclaimer in the
   44  *    documentation and/or other materials provided with the distribution.
   45  * 3. Neither the name of the University nor the names of its contributors
   46  *    may be used to endorse or promote products derived from this software
   47  *    without specific prior written permission.
   48  *
   49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   59  * SUCH DAMAGE.
   60  *
   61  *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
   62  */
   63 
   64 #include <sys/cdefs.h>
   65 __KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.67 2005/03/11 06:16:16 atatat Exp $");
   66 
   67 #include <sys/param.h>
   68 #include <sys/malloc.h>
   69 #include <sys/mbuf.h>
   70 #include <sys/protosw.h>
   71 #include <sys/socket.h>
   72 #include <sys/socketvar.h>
   73 #include <sys/errno.h>
   74 #include <sys/stat.h>
   75 #include <sys/systm.h>
   76 #include <sys/proc.h>
   77 #include <sys/syslog.h>
   78 #include <sys/sysctl.h>
   79 
   80 #include <net/if.h>
   81 #include <net/route.h>
   82 #include <net/if_types.h>
   83 
   84 #include <netinet/in.h>
   85 #include <netinet/in_var.h>
   86 #include <netinet/in_systm.h>
   87 #include <netinet/ip.h>
   88 #include <netinet/ip_var.h>
   89 #include <netinet/in_pcb.h>
   90 #include <netinet/udp.h>
   91 #include <netinet/udp_var.h>
   92 #include <netinet/ip6.h>
   93 #include <netinet6/ip6_var.h>
   94 #include <netinet6/in6_pcb.h>
   95 #include <netinet/icmp6.h>
   96 #include <netinet6/udp6_var.h>
   97 #include <netinet6/ip6protosw.h>
   98 
   99 #include "faith.h"
  100 #if defined(NFAITH) && NFAITH > 0
  101 #include <net/if_faith.h>
  102 #endif
  103 
  104 /*
  105  * UDP protocol inplementation.
  106  * Per RFC 768, August, 1980.
  107  */
  108 
  109 extern struct inpcbtable udbtable;
  110 struct  udp6stat udp6stat;
  111 
  112 static  void udp6_notify __P((struct in6pcb *, int));
  113 
  114 void
  115 udp6_init()
  116 {
  117         /* initialization done in udp_input() due to initialization order */
  118 }
  119 
  120 /*
  121  * Notify a udp user of an asynchronous error;
  122  * just wake up so that he can collect error status.
  123  */
  124 static  void
  125 udp6_notify(in6p, errno)
  126         struct in6pcb *in6p;
  127         int errno;
  128 {
  129         in6p->in6p_socket->so_error = errno;
  130         sorwakeup(in6p->in6p_socket);
  131         sowwakeup(in6p->in6p_socket);
  132 }
  133 
  134 void
  135 udp6_ctlinput(cmd, sa, d)
  136         int cmd;
  137         struct sockaddr *sa;
  138         void *d;
  139 {
  140         struct udphdr uh;
  141         struct ip6_hdr *ip6;
  142         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
  143         struct mbuf *m;
  144         int off;
  145         void *cmdarg;
  146         struct ip6ctlparam *ip6cp = NULL;
  147         const struct sockaddr_in6 *sa6_src = NULL;
  148         void (*notify) __P((struct in6pcb *, int)) = udp6_notify;
  149         struct udp_portonly {
  150                 u_int16_t uh_sport;
  151                 u_int16_t uh_dport;
  152         } *uhp;
  153 
  154         if (sa->sa_family != AF_INET6 ||
  155             sa->sa_len != sizeof(struct sockaddr_in6))
  156                 return;
  157 
  158         if ((unsigned)cmd >= PRC_NCMDS)
  159                 return;
  160         if (PRC_IS_REDIRECT(cmd))
  161                 notify = in6_rtchange, d = NULL;
  162         else if (cmd == PRC_HOSTDEAD)
  163                 d = NULL;
  164         else if (cmd == PRC_MSGSIZE) {
  165                 /* special code is present, see below */
  166                 notify = in6_rtchange;
  167         }
  168         else if (inet6ctlerrmap[cmd] == 0)
  169                 return;
  170 
  171         /* if the parameter is from icmp6, decode it. */
  172         if (d != NULL) {
  173                 ip6cp = (struct ip6ctlparam *)d;
  174                 m = ip6cp->ip6c_m;
  175                 ip6 = ip6cp->ip6c_ip6;
  176                 off = ip6cp->ip6c_off;
  177                 cmdarg = ip6cp->ip6c_cmdarg;
  178                 sa6_src = ip6cp->ip6c_src;
  179         } else {
  180                 m = NULL;
  181                 ip6 = NULL;
  182                 cmdarg = NULL;
  183                 sa6_src = &sa6_any;
  184                 off = 0;
  185         }
  186 
  187         if (ip6) {
  188                 /*
  189                  * XXX: We assume that when IPV6 is non NULL,
  190                  * M and OFF are valid.
  191                  */
  192 
  193                 /* check if we can safely examine src and dst ports */
  194                 if (m->m_pkthdr.len < off + sizeof(*uhp)) {
  195                         if (cmd == PRC_MSGSIZE)
  196                                 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0);
  197                         return;
  198                 }
  199 
  200                 bzero(&uh, sizeof(uh));
  201                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
  202 
  203                 if (cmd == PRC_MSGSIZE) {
  204                         int valid = 0;
  205 
  206                         /*
  207                          * Check to see if we have a valid UDP socket
  208                          * corresponding to the address in the ICMPv6 message
  209                          * payload.
  210                          */
  211                         if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr,
  212                             uh.uh_dport, (struct in6_addr *)&sa6_src->sin6_addr,
  213                             uh.uh_sport, 0))
  214                                 valid++;
  215 #if 0
  216                         /*
  217                          * As the use of sendto(2) is fairly popular,
  218                          * we may want to allow non-connected pcb too.
  219                          * But it could be too weak against attacks...
  220                          * We should at least check if the local address (= s)
  221                          * is really ours.
  222                          */
  223                         else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr,
  224                             uh.uh_dport, 0))
  225                                 valid++;
  226 #endif
  227 
  228                         /*
  229                          * Depending on the value of "valid" and routing table
  230                          * size (mtudisc_{hi,lo}wat), we will:
  231                          * - recalculate the new MTU and create the
  232                          *   corresponding routing entry, or
  233                          * - ignore the MTU change notification.
  234                          */
  235                         icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
  236 
  237                         /*
  238                          * regardless of if we called icmp6_mtudisc_update(),
  239                          * we need to call in6_pcbnotify(), to notify path
  240                          * MTU change to the userland (2292bis-02), because
  241                          * some unconnected sockets may share the same
  242                          * destination and want to know the path MTU.
  243                          */
  244                 }
  245 
  246                 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport,
  247                     (struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg,
  248                     notify);
  249         } else {
  250                 (void) in6_pcbnotify(&udbtable, sa, 0,
  251                     (struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  252         }
  253 }
  254 
  255 extern  int udp6_sendspace;
  256 extern  int udp6_recvspace;
  257 
  258 int
  259 udp6_usrreq(so, req, m, addr6, control, p)
  260         struct socket *so;
  261         int req;
  262         struct mbuf *m, *addr6, *control;
  263         struct proc *p;
  264 {
  265         struct  in6pcb *in6p = sotoin6pcb(so);
  266         int     error = 0;
  267         int     s;
  268 
  269         /*
  270          * MAPPED_ADDR implementation info:
  271          *  Mapped addr support for PRU_CONTROL is not necessary.
  272          *  Because typical user of PRU_CONTROL is such as ifconfig,
  273          *  and they don't associate any addr to their socket.  Then
  274          *  socket family is only hint about the PRU_CONTROL'ed address
  275          *  family, especially when getting addrs from kernel.
  276          *  So AF_INET socket need to be used to control AF_INET addrs,
  277          *  and AF_INET6 socket for AF_INET6 addrs.
  278          */
  279         if (req == PRU_CONTROL)
  280                 return (in6_control(so, (u_long)m, (caddr_t)addr6,
  281                                    (struct ifnet *)control, p));
  282 
  283         if (req == PRU_PURGEIF) {
  284                 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control);
  285                 in6_purgeif((struct ifnet *)control);
  286                 in6_pcbpurgeif(&udbtable, (struct ifnet *)control);
  287                 return (0);
  288         }
  289 
  290         if (in6p == NULL && req != PRU_ATTACH) {
  291                 error = EINVAL;
  292                 goto release;
  293         }
  294 
  295         switch (req) {
  296         case PRU_ATTACH:
  297                 /*
  298                  * MAPPED_ADDR implementation spec:
  299                  *  Always attach for IPv6,
  300                  *  and only when necessary for IPv4.
  301                  */
  302                 if (in6p != NULL) {
  303                         error = EINVAL;
  304                         break;
  305                 }
  306                 s = splsoftnet();
  307                 error = in6_pcballoc(so, &udbtable);
  308                 splx(s);
  309                 if (error)
  310                         break;
  311                 error = soreserve(so, udp6_sendspace, udp6_recvspace);
  312                 if (error)
  313                         break;
  314                 in6p = sotoin6pcb(so);
  315                 in6p->in6p_cksum = -1;  /* just to be sure */
  316                 break;
  317 
  318         case PRU_DETACH:
  319                 in6_pcbdetach(in6p);
  320                 break;
  321 
  322         case PRU_BIND:
  323                 s = splsoftnet();
  324                 error = in6_pcbbind(in6p, addr6, p);
  325                 splx(s);
  326                 break;
  327 
  328         case PRU_LISTEN:
  329                 error = EOPNOTSUPP;
  330                 break;
  331 
  332         case PRU_CONNECT:
  333                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  334                         error = EISCONN;
  335                         break;
  336                 }
  337                 s = splsoftnet();
  338                 error = in6_pcbconnect(in6p, addr6);
  339                 splx(s);
  340                 if (error == 0)
  341                         soisconnected(so);
  342                 break;
  343 
  344         case PRU_CONNECT2:
  345                 error = EOPNOTSUPP;
  346                 break;
  347 
  348         case PRU_ACCEPT:
  349                 error = EOPNOTSUPP;
  350                 break;
  351 
  352         case PRU_DISCONNECT:
  353                 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  354                         error = ENOTCONN;
  355                         break;
  356                 }
  357                 s = splsoftnet();
  358                 in6_pcbdisconnect(in6p);
  359                 bzero((caddr_t)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr));
  360                 splx(s);
  361                 so->so_state &= ~SS_ISCONNECTED;                /* XXX */
  362                 in6_pcbstate(in6p, IN6P_BOUND);         /* XXX */
  363                 break;
  364 
  365         case PRU_SHUTDOWN:
  366                 socantsendmore(so);
  367                 break;
  368 
  369         case PRU_SEND:
  370                 return (udp6_output(in6p, m, addr6, control, p));
  371 
  372         case PRU_ABORT:
  373                 soisdisconnected(so);
  374                 in6_pcbdetach(in6p);
  375                 break;
  376 
  377         case PRU_SOCKADDR:
  378                 in6_setsockaddr(in6p, addr6);
  379                 break;
  380 
  381         case PRU_PEERADDR:
  382                 in6_setpeeraddr(in6p, addr6);
  383                 break;
  384 
  385         case PRU_SENSE:
  386                 /*
  387                  * stat: don't bother with a blocksize
  388                  */
  389                 return (0);
  390 
  391         case PRU_SENDOOB:
  392         case PRU_FASTTIMO:
  393         case PRU_SLOWTIMO:
  394         case PRU_PROTORCV:
  395         case PRU_PROTOSEND:
  396                 error = EOPNOTSUPP;
  397                 break;
  398 
  399         case PRU_RCVD:
  400         case PRU_RCVOOB:
  401                 return (EOPNOTSUPP);    /* do not free mbuf's */
  402 
  403         default:
  404                 panic("udp6_usrreq");
  405         }
  406 
  407 release:
  408         if (control)
  409                 m_freem(control);
  410         if (m)
  411                 m_freem(m);
  412         return (error);
  413 }
  414 
  415 SYSCTL_SETUP(sysctl_net_inet6_udp6_setup, "sysctl net.inet6.udp6 subtree setup")
  416 {
  417         sysctl_createv(clog, 0, NULL, NULL,
  418                        CTLFLAG_PERMANENT,
  419                        CTLTYPE_NODE, "net", NULL,
  420                        NULL, 0, NULL, 0,
  421                        CTL_NET, CTL_EOL);
  422         sysctl_createv(clog, 0, NULL, NULL,
  423                        CTLFLAG_PERMANENT,
  424                        CTLTYPE_NODE, "inet6", NULL,
  425                        NULL, 0, NULL, 0,
  426                        CTL_NET, PF_INET6, CTL_EOL);
  427         sysctl_createv(clog, 0, NULL, NULL,
  428                        CTLFLAG_PERMANENT,
  429                        CTLTYPE_NODE, "udp6",
  430                        SYSCTL_DESCR("UDPv6 related settings"),
  431                        NULL, 0, NULL, 0,
  432                        CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL);
  433 
  434         sysctl_createv(clog, 0, NULL, NULL,
  435                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
  436                        CTLTYPE_INT, "sendspace",
  437                        SYSCTL_DESCR("Default UDP send buffer size"),
  438                        NULL, 0, &udp6_sendspace, 0,
  439                        CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE,
  440                        CTL_EOL);
  441         sysctl_createv(clog, 0, NULL, NULL,
  442                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
  443                        CTLTYPE_INT, "recvspace",
  444                        SYSCTL_DESCR("Default UDP receive buffer size"),
  445                        NULL, 0, &udp6_recvspace, 0,
  446                        CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE,
  447                        CTL_EOL);
  448         sysctl_createv(clog, 0, NULL, NULL,
  449                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
  450                        CTLTYPE_INT, "do_loopback_cksum",
  451                        SYSCTL_DESCR("Perform UDP checksum on loopback"),
  452                        NULL, 0, &udp_do_loopback_cksum, 0,
  453                        CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM,
  454                        CTL_EOL);
  455         sysctl_createv(clog, 0, NULL, NULL,
  456                        CTLFLAG_PERMANENT,
  457                        CTLTYPE_STRUCT, "pcblist",
  458                        SYSCTL_DESCR("UDP protocol control block list"),
  459                        sysctl_inpcblist, 0, &udbtable, 0,
  460                        CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE,
  461                        CTL_EOL);
  462 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/udp6_usrreq.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/udp6_usrreq.c
