udp6_usrreq.c

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    1 /*      $NetBSD: udp6_usrreq.c,v 1.86 2008/05/04 07:22:15 thorpej 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 1.86 2008/05/04 07:22:15 thorpej 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/udp6_private.h>
   98 #include <netinet6/ip6protosw.h>
   99 #include <netinet/in_offload.h>
  100 
  101 #include "faith.h"
  102 #if defined(NFAITH) && NFAITH > 0
  103 #include <net/if_faith.h>
  104 #endif
  105 
  106 /*
  107  * UDP protocol implementation.
  108  * Per RFC 768, August, 1980.
  109  */
  110 
  111 extern struct inpcbtable udbtable;
  112 
  113 percpu_t *udp6stat_percpu;
  114 
  115 static  void udp6_notify(struct in6pcb *, int);
  116 
  117 void
  118 udp6_init(void)
  119 {
  120         /* initialization done in udp_init() due to initialization order */
  121 }
  122 
  123 /*
  124  * Notify a udp user of an asynchronous error;
  125  * just wake up so that he can collect error status.
  126  */
  127 static  void
  128 udp6_notify(struct in6pcb *in6p, int errno)
  129 {
  130         in6p->in6p_socket->so_error = errno;
  131         sorwakeup(in6p->in6p_socket);
  132         sowwakeup(in6p->in6p_socket);
  133 }
  134 
  135 void *
  136 udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d)
  137 {
  138         struct udphdr uh;
  139         struct ip6_hdr *ip6;
  140         const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa;
  141         struct mbuf *m;
  142         int off;
  143         void *cmdarg;
  144         struct ip6ctlparam *ip6cp = NULL;
  145         const struct sockaddr_in6 *sa6_src = NULL;
  146         void (*notify)(struct in6pcb *, int) = udp6_notify;
  147         struct udp_portonly {
  148                 u_int16_t uh_sport;
  149                 u_int16_t uh_dport;
  150         } *uhp;
  151 
  152         if (sa->sa_family != AF_INET6 ||
  153             sa->sa_len != sizeof(struct sockaddr_in6))
  154                 return NULL;
  155 
  156         if ((unsigned)cmd >= PRC_NCMDS)
  157                 return NULL;
  158         if (PRC_IS_REDIRECT(cmd))
  159                 notify = in6_rtchange, d = NULL;
  160         else if (cmd == PRC_HOSTDEAD)
  161                 d = NULL;
  162         else if (cmd == PRC_MSGSIZE) {
  163                 /* special code is present, see below */
  164                 notify = in6_rtchange;
  165         }
  166         else if (inet6ctlerrmap[cmd] == 0)
  167                 return NULL;
  168 
  169         /* if the parameter is from icmp6, decode it. */
  170         if (d != NULL) {
  171                 ip6cp = (struct ip6ctlparam *)d;
  172                 m = ip6cp->ip6c_m;
  173                 ip6 = ip6cp->ip6c_ip6;
  174                 off = ip6cp->ip6c_off;
  175                 cmdarg = ip6cp->ip6c_cmdarg;
  176                 sa6_src = ip6cp->ip6c_src;
  177         } else {
  178                 m = NULL;
  179                 ip6 = NULL;
  180                 cmdarg = NULL;
  181                 sa6_src = &sa6_any;
  182                 off = 0;
  183         }
  184 
  185         if (ip6) {
  186                 /*
  187                  * XXX: We assume that when IPV6 is non NULL,
  188                  * M and OFF are valid.
  189                  */
  190 
  191                 /* check if we can safely examine src and dst ports */
  192                 if (m->m_pkthdr.len < off + sizeof(*uhp)) {
  193                         if (cmd == PRC_MSGSIZE)
  194                                 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0);
  195                         return NULL;
  196                 }
  197 
  198                 bzero(&uh, sizeof(uh));
  199                 m_copydata(m, off, sizeof(*uhp), (void *)&uh);
  200 
  201                 if (cmd == PRC_MSGSIZE) {
  202                         int valid = 0;
  203 
  204                         /*
  205                          * Check to see if we have a valid UDP socket
  206                          * corresponding to the address in the ICMPv6 message
  207                          * payload.
  208                          */
  209                         if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr,
  210                             uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr,
  211                             uh.uh_sport, 0))
  212                                 valid++;
  213 #if 0
  214                         /*
  215                          * As the use of sendto(2) is fairly popular,
  216                          * we may want to allow non-connected pcb too.
  217                          * But it could be too weak against attacks...
  218                          * We should at least check if the local address (= s)
  219                          * is really ours.
  220                          */
  221                         else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr,
  222                             uh.uh_dport, 0))
  223                                 valid++;
  224 #endif
  225 
  226                         /*
  227                          * Depending on the value of "valid" and routing table
  228                          * size (mtudisc_{hi,lo}wat), we will:
  229                          * - recalculate the new MTU and create the
  230                          *   corresponding routing entry, or
  231                          * - ignore the MTU change notification.
  232                          */
  233                         icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
  234 
  235                         /*
  236                          * regardless of if we called
  237                          * icmp6_mtudisc_update(), we need to call
  238                          * in6_pcbnotify(), to notify path MTU change
  239                          * to the userland (RFC3542), because some
  240                          * unconnected sockets may share the same
  241                          * destination and want to know the path MTU.
  242                          */
  243                 }
  244 
  245                 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport,
  246                     (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg,
  247                     notify);
  248         } else {
  249                 (void) in6_pcbnotify(&udbtable, sa, 0,
  250                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  251         }
  252         return NULL;
  253 }
  254 
  255 extern  int udp6_sendspace;
  256 extern  int udp6_recvspace;
  257 
  258 int
  259 udp6_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr6,
  260     struct mbuf *control, struct lwp *l)
  261 {
  262         struct  in6pcb *in6p = sotoin6pcb(so);
  263         int     error = 0;
  264         int     s;
  265 
  266         /*
  267          * MAPPED_ADDR implementation info:
  268          *  Mapped addr support for PRU_CONTROL is not necessary.
  269          *  Because typical user of PRU_CONTROL is such as ifconfig,
  270          *  and they don't associate any addr to their socket.  Then
  271          *  socket family is only hint about the PRU_CONTROL'ed address
  272          *  family, especially when getting addrs from kernel.
  273          *  So AF_INET socket need to be used to control AF_INET addrs,
  274          *  and AF_INET6 socket for AF_INET6 addrs.
  275          */
  276         if (req == PRU_CONTROL)
  277                 return in6_control(so, (u_long)m, (void *)addr6,
  278                                    (struct ifnet *)control, l);
  279 
  280         if (req == PRU_PURGEIF) {
  281                 mutex_enter(softnet_lock);
  282                 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control);
  283                 in6_purgeif((struct ifnet *)control);
  284                 in6_pcbpurgeif(&udbtable, (struct ifnet *)control);
  285                 mutex_exit(softnet_lock);
  286                 return 0;
  287         }
  288 
  289         if (req == PRU_ATTACH)
  290                 sosetlock(so);
  291         else if (in6p == NULL) {
  292                 error = EINVAL;
  293                 goto release;
  294         }
  295 
  296         switch (req) {
  297         case PRU_ATTACH:
  298                 /*
  299                  * MAPPED_ADDR implementation spec:
  300                  *  Always attach for IPv6,
  301                  *  and only when necessary for IPv4.
  302                  */
  303                 if (in6p != NULL) {
  304                         error = EINVAL;
  305                         break;
  306                 }
  307                 s = splsoftnet();
  308                 error = in6_pcballoc(so, &udbtable);
  309                 splx(s);
  310                 if (error)
  311                         break;
  312                 error = soreserve(so, udp6_sendspace, udp6_recvspace);
  313                 if (error)
  314                         break;
  315                 in6p = sotoin6pcb(so);
  316                 in6p->in6p_cksum = -1;  /* just to be sure */
  317                 break;
  318 
  319         case PRU_DETACH:
  320                 in6_pcbdetach(in6p);
  321                 break;
  322 
  323         case PRU_BIND:
  324                 s = splsoftnet();
  325                 error = in6_pcbbind(in6p, addr6, l);
  326                 splx(s);
  327                 break;
  328 
  329         case PRU_CONNECT:
  330                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  331                         error = EISCONN;
  332                         break;
  333                 }
  334                 s = splsoftnet();
  335                 error = in6_pcbconnect(in6p, addr6, l);
  336                 splx(s);
  337                 if (error == 0)
  338                         soisconnected(so);
  339                 break;
  340 
  341         case PRU_DISCONNECT:
  342                 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  343                         error = ENOTCONN;
  344                         break;
  345                 }
  346                 s = splsoftnet();
  347                 in6_pcbdisconnect(in6p);
  348                 bzero((void *)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr));
  349                 splx(s);
  350                 so->so_state &= ~SS_ISCONNECTED;                /* XXX */
  351                 in6_pcbstate(in6p, IN6P_BOUND);         /* XXX */
  352                 break;
  353 
  354         case PRU_SHUTDOWN:
  355                 socantsendmore(so);
  356                 break;
  357 
  358         case PRU_SEND:
  359                 s = splsoftnet();
  360                 error = udp6_output(in6p, m, addr6, control, l);
  361                 splx(s);
  362                 return error;
  363 
  364         case PRU_ABORT:
  365                 soisdisconnected(so);
  366                 in6_pcbdetach(in6p);
  367                 break;
  368 
  369         case PRU_SOCKADDR:
  370                 in6_setsockaddr(in6p, addr6);
  371                 break;
  372 
  373         case PRU_PEERADDR:
  374                 in6_setpeeraddr(in6p, addr6);
  375                 break;
  376 
  377         case PRU_SENSE:
  378                 /*
  379                  * stat: don't bother with a blocksize
  380                  */
  381                 return 0;
  382 
  383         case PRU_LISTEN:
  384         case PRU_CONNECT2:
  385         case PRU_ACCEPT:
  386         case PRU_SENDOOB:
  387         case PRU_FASTTIMO:
  388         case PRU_SLOWTIMO:
  389         case PRU_PROTORCV:
  390         case PRU_PROTOSEND:
  391                 error = EOPNOTSUPP;
  392                 break;
  393 
  394         case PRU_RCVD:
  395         case PRU_RCVOOB:
  396                 return EOPNOTSUPP;      /* do not free mbuf's */
  397 
  398         default:
  399                 panic("udp6_usrreq");
  400         }
  401 
  402 release:
  403         if (control != NULL)
  404                 m_freem(control);
  405         if (m != NULL)
  406                 m_freem(m);
  407         return error;
  408 }
  409 
  410 static int
  411 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS)
  412 {
  413 
  414         return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS));
  415 }
  416 
  417 SYSCTL_SETUP(sysctl_net_inet6_udp6_setup, "sysctl net.inet6.udp6 subtree setup")
  418 {
  419         sysctl_createv(clog, 0, NULL, NULL,
  420                        CTLFLAG_PERMANENT,
  421                        CTLTYPE_NODE, "net", NULL,
  422                        NULL, 0, NULL, 0,
  423                        CTL_NET, CTL_EOL);
  424         sysctl_createv(clog, 0, NULL, NULL,
  425                        CTLFLAG_PERMANENT,
  426                        CTLTYPE_NODE, "inet6", NULL,
  427                        NULL, 0, NULL, 0,
  428                        CTL_NET, PF_INET6, CTL_EOL);
  429         sysctl_createv(clog, 0, NULL, NULL,
  430                        CTLFLAG_PERMANENT,
  431                        CTLTYPE_NODE, "udp6",
  432                        SYSCTL_DESCR("UDPv6 related settings"),
  433                        NULL, 0, NULL, 0,
  434                        CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL);
  435 
  436         sysctl_createv(clog, 0, NULL, NULL,
  437                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
  438                        CTLTYPE_INT, "sendspace",
  439                        SYSCTL_DESCR("Default UDP send buffer size"),
  440                        NULL, 0, &udp6_sendspace, 0,
  441                        CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE,
  442                        CTL_EOL);
  443         sysctl_createv(clog, 0, NULL, NULL,
  444                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
  445                        CTLTYPE_INT, "recvspace",
  446                        SYSCTL_DESCR("Default UDP receive buffer size"),
  447                        NULL, 0, &udp6_recvspace, 0,
  448                        CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE,
  449                        CTL_EOL);
  450         sysctl_createv(clog, 0, NULL, NULL,
  451                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
  452                        CTLTYPE_INT, "do_loopback_cksum",
  453                        SYSCTL_DESCR("Perform UDP checksum on loopback"),
  454                        NULL, 0, &udp_do_loopback_cksum, 0,
  455                        CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM,
  456                        CTL_EOL);
  457         sysctl_createv(clog, 0, NULL, NULL,
  458                        CTLFLAG_PERMANENT,
  459                        CTLTYPE_STRUCT, "pcblist",
  460                        SYSCTL_DESCR("UDP protocol control block list"),
  461                        sysctl_inpcblist, 0, &udbtable, 0,
  462                        CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE,
  463                        CTL_EOL);
  464         sysctl_createv(clog, 0, NULL, NULL,
  465                        CTLFLAG_PERMANENT,
  466                        CTLTYPE_STRUCT, "stats",
  467                        SYSCTL_DESCR("UDPv6 statistics"),
  468                        sysctl_net_inet6_udp6_stats, 0, NULL, 0,
  469                        CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS,
  470                        CTL_EOL);
  471 }
  472 
  473 void
  474 udp6_statinc(u_int stat)
  475 {
  476 
  477         KASSERT(stat < UDP6_NSTATS);
  478         UDP6_STATINC(stat);
  479 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/udp6_usrreq.c

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