udp6_output.c

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    1 /*      $FreeBSD: releng/6.1/sys/netinet6/udp6_output.c 158179 2006-04-30 16:44:43Z cvs2svn $   */
    2 /*      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei 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  * 4. 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 "opt_ipsec.h"
   65 #include "opt_inet.h"
   66 #include "opt_inet6.h"
   67 
   68 #include <sys/param.h>
   69 #include <sys/proc.h>
   70 #include <sys/malloc.h>
   71 #include <sys/mbuf.h>
   72 #include <sys/protosw.h>
   73 #include <sys/socket.h>
   74 #include <sys/socketvar.h>
   75 #include <sys/sysctl.h>
   76 #include <sys/errno.h>
   77 #include <sys/stat.h>
   78 #include <sys/systm.h>
   79 #include <sys/syslog.h>
   80 
   81 #include <net/if.h>
   82 #include <net/route.h>
   83 #include <net/if_types.h>
   84 
   85 #include <netinet/in.h>
   86 #include <netinet/in_var.h>
   87 #include <netinet/in_systm.h>
   88 #include <netinet/ip.h>
   89 #include <netinet/ip_var.h>
   90 #include <netinet/in_pcb.h>
   91 #include <netinet/udp.h>
   92 #include <netinet/udp_var.h>
   93 #include <netinet/ip6.h>
   94 #include <netinet6/ip6_var.h>
   95 #include <netinet6/in6_pcb.h>
   96 #include <netinet6/udp6_var.h>
   97 #include <netinet/icmp6.h>
   98 #include <netinet6/ip6protosw.h>
   99 #include <netinet6/scope6_var.h>
  100 
  101 #ifdef IPSEC
  102 #include <netinet6/ipsec.h>
  103 #ifdef INET6
  104 #include <netinet6/ipsec6.h>
  105 #endif
  106 #endif /* IPSEC */
  107 
  108 #include <net/net_osdep.h>
  109 
  110 /*
  111  * UDP protocol inplementation.
  112  * Per RFC 768, August, 1980.
  113  */
  114 
  115 #define in6pcb          inpcb
  116 #define udp6stat        udpstat
  117 #define udp6s_opackets  udps_opackets
  118 
  119 int
  120 udp6_output(in6p, m, addr6, control, td)
  121         struct in6pcb *in6p;
  122         struct mbuf *m;
  123         struct mbuf *control;
  124         struct sockaddr *addr6;
  125         struct thread *td;
  126 {
  127         u_int32_t ulen = m->m_pkthdr.len;
  128         u_int32_t plen = sizeof(struct udphdr) + ulen;
  129         struct ip6_hdr *ip6;
  130         struct udphdr *udp6;
  131         struct in6_addr *laddr, *faddr;
  132         struct sockaddr_in6 *sin6 = NULL;
  133         struct ifnet *oifp = NULL;
  134         int scope_ambiguous = 0;
  135         u_short fport;
  136         int error = 0;
  137         struct ip6_pktopts *optp, opt;
  138         int priv;
  139         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
  140         int flags;
  141         struct sockaddr_in6 tmp;
  142 
  143         priv = 0;
  144         if (td && !suser(td))
  145                 priv = 1;
  146 
  147         if (addr6) {
  148                 /* addr6 has been validated in udp6_send(). */
  149                 sin6 = (struct sockaddr_in6 *)addr6;
  150 
  151                 /* protect *sin6 from overwrites */
  152                 tmp = *sin6;
  153                 sin6 = &tmp;
  154 
  155                 /*
  156                  * Application should provide a proper zone ID or the use of
  157                  * default zone IDs should be enabled.  Unfortunately, some
  158                  * applications do not behave as it should, so we need a
  159                  * workaround.  Even if an appropriate ID is not determined,
  160                  * we'll see if we can determine the outgoing interface.  If we
  161                  * can, determine the zone ID based on the interface below.
  162                  */
  163                 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
  164                         scope_ambiguous = 1;
  165                 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
  166                         return (error);
  167         }
  168 
  169         if (control) {
  170                 if ((error = ip6_setpktopts(control, &opt,
  171                     in6p->in6p_outputopts, priv, IPPROTO_UDP)) != 0)
  172                         goto release;
  173                 optp = &opt;
  174         } else
  175                 optp = in6p->in6p_outputopts;
  176 
  177         if (sin6) {
  178                 faddr = &sin6->sin6_addr;
  179 
  180                 /*
  181                  * IPv4 version of udp_output calls in_pcbconnect in this case,
  182                  * which needs splnet and affects performance.
  183                  * Since we saw no essential reason for calling in_pcbconnect,
  184                  * we get rid of such kind of logic, and call in6_selectsrc
  185                  * and in6_pcbsetport in order to fill in the local address
  186                  * and the local port.
  187                  */
  188                 if (sin6->sin6_port == 0) {
  189                         error = EADDRNOTAVAIL;
  190                         goto release;
  191                 }
  192 
  193                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  194                         /* how about ::ffff:0.0.0.0 case? */
  195                         error = EISCONN;
  196                         goto release;
  197                 }
  198 
  199                 fport = sin6->sin6_port; /* allow 0 port */
  200 
  201                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
  202                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
  203                                 /*
  204                                  * I believe we should explicitly discard the
  205                                  * packet when mapped addresses are disabled,
  206                                  * rather than send the packet as an IPv6 one.
  207                                  * If we chose the latter approach, the packet
  208                                  * might be sent out on the wire based on the
  209                                  * default route, the situation which we'd
  210                                  * probably want to avoid.
  211                                  * (20010421 jinmei@kame.net)
  212                                  */
  213                                 error = EINVAL;
  214                                 goto release;
  215                         }
  216                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
  217                             !IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) {
  218                                 /*
  219                                  * when remote addr is an IPv4-mapped address,
  220                                  * local addr should not be an IPv6 address,
  221                                  * since you cannot determine how to map IPv6
  222                                  * source address to IPv4.
  223                                  */
  224                                 error = EINVAL;
  225                                 goto release;
  226                         }
  227 
  228                         af = AF_INET;
  229                 }
  230 
  231                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
  232                         laddr = in6_selectsrc(sin6, optp, in6p->in6p_moptions,
  233                             NULL, &in6p->in6p_laddr, &oifp, &error);
  234                         if (oifp && scope_ambiguous &&
  235                             (error = in6_setscope(&sin6->sin6_addr,
  236                             oifp, NULL))) {
  237                                 goto release;
  238                         }
  239                 } else
  240                         laddr = &in6p->in6p_laddr;      /* XXX */
  241                 if (laddr == NULL) {
  242                         if (error == 0)
  243                                 error = EADDRNOTAVAIL;
  244                         goto release;
  245                 }
  246                 if (in6p->in6p_lport == 0 &&
  247                     (error = in6_pcbsetport(laddr, in6p, td->td_ucred)) != 0)
  248                         goto release;
  249         } else {
  250                 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  251                         error = ENOTCONN;
  252                         goto release;
  253                 }
  254                 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
  255                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
  256                                 /*
  257                                  * XXX: this case would happen when the
  258                                  * application sets the V6ONLY flag after
  259                                  * connecting the foreign address.
  260                                  * Such applications should be fixed,
  261                                  * so we bark here.
  262                                  */
  263                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
  264                                     "option was set for a connected socket\n");
  265                                 error = EINVAL;
  266                                 goto release;
  267                         } else
  268                                 af = AF_INET;
  269                 }
  270                 laddr = &in6p->in6p_laddr;
  271                 faddr = &in6p->in6p_faddr;
  272                 fport = in6p->in6p_fport;
  273         }
  274 
  275         if (af == AF_INET)
  276                 hlen = sizeof(struct ip);
  277 
  278         /*
  279          * Calculate data length and get a mbuf
  280          * for UDP and IP6 headers.
  281          */
  282         M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
  283         if (m == 0) {
  284                 error = ENOBUFS;
  285                 goto release;
  286         }
  287 
  288         /*
  289          * Stuff checksum and output datagram.
  290          */
  291         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  292         udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
  293         udp6->uh_dport = fport;
  294         if (plen <= 0xffff)
  295                 udp6->uh_ulen = htons((u_short)plen);
  296         else
  297                 udp6->uh_ulen = 0;
  298         udp6->uh_sum = 0;
  299 
  300         switch (af) {
  301         case AF_INET6:
  302                 ip6 = mtod(m, struct ip6_hdr *);
  303                 ip6->ip6_flow   = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
  304                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  305                 ip6->ip6_vfc    |= IPV6_VERSION;
  306 #if 0                           /* ip6_plen will be filled in ip6_output. */
  307                 ip6->ip6_plen   = htons((u_short)plen);
  308 #endif
  309                 ip6->ip6_nxt    = IPPROTO_UDP;
  310                 ip6->ip6_hlim   = in6_selecthlim(in6p, NULL);
  311                 ip6->ip6_src    = *laddr;
  312                 ip6->ip6_dst    = *faddr;
  313 
  314                 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
  315                                 sizeof(struct ip6_hdr), plen)) == 0) {
  316                         udp6->uh_sum = 0xffff;
  317                 }
  318 
  319                 flags = 0;
  320 
  321                 udp6stat.udp6s_opackets++;
  322                 error = ip6_output(m, optp, NULL, flags, in6p->in6p_moptions,
  323                     NULL, in6p);
  324                 break;
  325         case AF_INET:
  326                 error = EAFNOSUPPORT;
  327                 goto release;
  328         }
  329         goto releaseopt;
  330 
  331 release:
  332         m_freem(m);
  333 
  334 releaseopt:
  335         if (control) {
  336                 ip6_clearpktopts(&opt, -1);
  337                 m_freem(control);
  338         }
  339         return (error);
  340 }
Cache object: 9ae01e6ba3247da74fe8638cd0531a81
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/udp6_output.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/udp6_output.c
