The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $FreeBSD: releng/5.3/sys/netinet6/udp6_output.c 136588 2004-10-16 08:43:07Z 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 
  100 #ifdef IPSEC
  101 #include <netinet6/ipsec.h>
  102 #ifdef INET6
  103 #include <netinet6/ipsec6.h>
  104 #endif
  105 #endif /* IPSEC */
  106 
  107 #include <net/net_osdep.h>
  108 
  109 /*
  110  * UDP protocol inplementation.
  111  * Per RFC 768, August, 1980.
  112  */
  113 
  114 #define in6pcb          inpcb
  115 #define udp6stat        udpstat
  116 #define udp6s_opackets  udps_opackets
  117 
  118 int
  119 udp6_output(in6p, m, addr6, control, td)
  120         struct in6pcb *in6p;
  121         struct mbuf *m;
  122         struct mbuf *control;
  123         struct sockaddr *addr6;
  124         struct thread *td;
  125 {
  126         u_int32_t ulen = m->m_pkthdr.len;
  127         u_int32_t plen = sizeof(struct udphdr) + ulen;
  128         struct ip6_hdr *ip6;
  129         struct udphdr *udp6;
  130         struct in6_addr *laddr, *faddr;
  131         u_short fport;
  132         int error = 0;
  133         struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
  134         int priv;
  135         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
  136         int flags;
  137         struct sockaddr_in6 tmp;
  138 
  139         priv = 0;
  140         if (td && !suser(td))
  141                 priv = 1;
  142         if (control) {
  143                 if ((error = ip6_setpktoptions(control, &opt, stickyopt, priv,
  144                                                0, IPPROTO_UDP)) != 0)
  145                         goto release;
  146                 in6p->in6p_outputopts = &opt;
  147         }
  148 
  149         if (addr6) {
  150                 /*
  151                  * IPv4 version of udp_output calls in_pcbconnect in this case,
  152                  * which needs splnet and affects performance.
  153                  * Since we saw no essential reason for calling in_pcbconnect,
  154                  * we get rid of such kind of logic, and call in6_selectsrc
  155                  * and in6_pcbsetport in order to fill in the local address
  156                  * and the local port.
  157                  */
  158                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
  159                 if (sin6->sin6_port == 0) {
  160                         error = EADDRNOTAVAIL;
  161                         goto release;
  162                 }
  163 
  164                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  165                         /* how about ::ffff:0.0.0.0 case? */
  166                         error = EISCONN;
  167                         goto release;
  168                 }
  169 
  170                 /* protect *sin6 from overwrites */
  171                 tmp = *sin6;
  172                 sin6 = &tmp;
  173 
  174                 faddr = &sin6->sin6_addr;
  175                 fport = sin6->sin6_port; /* allow 0 port */
  176 
  177                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
  178                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
  179                                 /*
  180                                  * I believe we should explicitly discard the
  181                                  * packet when mapped addresses are disabled,
  182                                  * rather than send the packet as an IPv6 one.
  183                                  * If we chose the latter approach, the packet
  184                                  * might be sent out on the wire based on the
  185                                  * default route, the situation which we'd
  186                                  * probably want to avoid.
  187                                  * (20010421 jinmei@kame.net)
  188                                  */
  189                                 error = EINVAL;
  190                                 goto release;
  191                         } else
  192                                 af = AF_INET;
  193                 }
  194 
  195                 /* KAME hack: embed scopeid */
  196                 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
  197                         error = EINVAL;
  198                         goto release;
  199                 }
  200 
  201                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
  202                         laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
  203                                               in6p->in6p_moptions, NULL,
  204                                               &in6p->in6p_laddr, &error);
  205                 } else
  206                         laddr = &in6p->in6p_laddr;      /* XXX */
  207                 if (laddr == NULL) {
  208                         if (error == 0)
  209                                 error = EADDRNOTAVAIL;
  210                         goto release;
  211                 }
  212                 if (in6p->in6p_lport == 0 &&
  213                     (error = in6_pcbsetport(laddr, in6p, td->td_ucred)) != 0)
  214                         goto release;
  215         } else {
  216                 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  217                         error = ENOTCONN;
  218                         goto release;
  219                 }
  220                 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
  221                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
  222                                 /*
  223                                  * XXX: this case would happen when the
  224                                  * application sets the V6ONLY flag after
  225                                  * connecting the foreign address.
  226                                  * Such applications should be fixed,
  227                                  * so we bark here.
  228                                  */
  229                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
  230                                     "option was set for a connected socket\n");
  231                                 error = EINVAL;
  232                                 goto release;
  233                         } else
  234                                 af = AF_INET;
  235                 }
  236                 laddr = &in6p->in6p_laddr;
  237                 faddr = &in6p->in6p_faddr;
  238                 fport = in6p->in6p_fport;
  239         }
  240 
  241         if (af == AF_INET)
  242                 hlen = sizeof(struct ip);
  243 
  244         /*
  245          * Calculate data length and get a mbuf
  246          * for UDP and IP6 headers.
  247          */
  248         M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
  249         if (m == 0) {
  250                 error = ENOBUFS;
  251                 goto release;
  252         }
  253 
  254         /*
  255          * Stuff checksum and output datagram.
  256          */
  257         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  258         udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
  259         udp6->uh_dport = fport;
  260         if (plen <= 0xffff)
  261                 udp6->uh_ulen = htons((u_short)plen);
  262         else
  263                 udp6->uh_ulen = 0;
  264         udp6->uh_sum = 0;
  265 
  266         switch (af) {
  267         case AF_INET6:
  268                 ip6 = mtod(m, struct ip6_hdr *);
  269                 ip6->ip6_flow   = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
  270                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  271                 ip6->ip6_vfc    |= IPV6_VERSION;
  272 #if 0                           /* ip6_plen will be filled in ip6_output. */
  273                 ip6->ip6_plen   = htons((u_short)plen);
  274 #endif
  275                 ip6->ip6_nxt    = IPPROTO_UDP;
  276                 ip6->ip6_hlim   = in6_selecthlim(in6p, NULL);
  277                 ip6->ip6_src    = *laddr;
  278                 ip6->ip6_dst    = *faddr;
  279 
  280                 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
  281                                 sizeof(struct ip6_hdr), plen)) == 0) {
  282                         udp6->uh_sum = 0xffff;
  283                 }
  284 
  285                 flags = 0;
  286 
  287                 udp6stat.udp6s_opackets++;
  288                 error = ip6_output(m, in6p->in6p_outputopts, NULL,
  289                     flags, in6p->in6p_moptions, NULL, in6p);
  290                 break;
  291         case AF_INET:
  292                 error = EAFNOSUPPORT;
  293                 goto release;
  294         }
  295         goto releaseopt;
  296 
  297 release:
  298         m_freem(m);
  299 
  300 releaseopt:
  301         if (control) {
  302                 ip6_clearpktopts(in6p->in6p_outputopts, -1);
  303                 in6p->in6p_outputopts = stickyopt;
  304                 m_freem(control);
  305         }
  306         return (error);
  307 }

Cache object: e53c3ed14f7b68a0ce3ae3bc18eb7025


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