udp6_output.c

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    1 /*      $FreeBSD: src/sys/netinet6/udp6_output.c,v 1.1.2.3 2001/08/31 13:49:58 jlemon Exp $     */
    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  * 3. All advertising materials mentioning features or use of this software
   46  *    must display the following acknowledgement:
   47  *      This product includes software developed by the University of
   48  *      California, Berkeley and its contributors.
   49  * 4. Neither the name of the University nor the names of its contributors
   50  *    may be used to endorse or promote products derived from this software
   51  *    without specific prior written permission.
   52  *
   53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   63  * SUCH DAMAGE.
   64  *
   65  *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
   66  */
   67 
   68 #include <sys/param.h>
   69 #include <sys/malloc.h>
   70 #include <sys/mbuf.h>
   71 #include <sys/protosw.h>
   72 #include <sys/socket.h>
   73 #include <sys/socketvar.h>
   74 #include <sys/sysctl.h>
   75 #include <sys/errno.h>
   76 #include <sys/stat.h>
   77 #include <sys/systm.h>
   78 #include <sys/proc.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 extern int ipsec_bypass;
  106 #endif /*IPSEC*/
  107 
  108 #include "faith.h"
  109 
  110 #include <net/net_osdep.h>
  111 
  112 /*
  113  * UDP protocol inplementation.
  114  * Per RFC 768, August, 1980.
  115  */
  116 
  117 #define in6pcb          inpcb
  118 #define udp6stat        udpstat
  119 #define udp6s_opackets  udps_opackets
  120 
  121 int
  122 udp6_output(in6p, m, addr6, control, p)
  123         struct in6pcb *in6p;
  124         struct mbuf *m;
  125         struct mbuf *control;
  126         struct sockaddr *addr6;
  127         struct proc *p;
  128 {
  129         u_int32_t ulen = m->m_pkthdr.len;
  130         u_int32_t plen = sizeof(struct udphdr) + ulen;
  131         struct ip6_hdr *ip6;
  132         struct udphdr *udp6;
  133         struct in6_addr *laddr, *faddr;
  134         u_short fport;
  135         int error = 0;
  136         struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
  137         int priv;
  138         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
  139         int flags;
  140         struct sockaddr_in6 tmp;
  141 
  142         priv = 0;
  143 #ifdef __APPLE__
  144         if (p && !suser(p->p_ucred, &p->p_acflag))
  145 #else
  146         if (p && !suser(p))
  147 #endif
  148                 priv = 1;
  149         if (control) {
  150                 if ((error = ip6_setpktoptions(control, &opt, priv, 0)) != 0)
  151                         goto release;
  152                 in6p->in6p_outputopts = &opt;
  153         }
  154 
  155         if (addr6) {
  156                 /*
  157                  * IPv4 version of udp_output calls in_pcbconnect in this case,
  158                  * which needs splnet and affects performance.
  159                  * Since we saw no essential reason for calling in_pcbconnect,
  160                  * we get rid of such kind of logic, and call in6_selectsrc
  161                  * and in6_pcbsetport in order to fill in the local address
  162                  * and the local port.
  163                  */
  164                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
  165                 if (sin6->sin6_port == 0) {
  166                         error = EADDRNOTAVAIL;
  167                         goto release;
  168                 }
  169 
  170                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  171                         /* how about ::ffff:0.0.0.0 case? */
  172                         error = EISCONN;
  173                         goto release;
  174                 }
  175 
  176                 /* protect *sin6 from overwrites */
  177                 tmp = *sin6;
  178                 sin6 = &tmp;
  179 
  180                 faddr = &sin6->sin6_addr;
  181                 fport = sin6->sin6_port; /* allow 0 port */
  182 
  183                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
  184                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
  185                                 /*
  186                                  * I believe we should explicitly discard the
  187                                  * packet when mapped addresses are disabled,
  188                                  * rather than send the packet as an IPv6 one.
  189                                  * If we chose the latter approach, the packet
  190                                  * might be sent out on the wire based on the
  191                                  * default route, the situation which we'd
  192                                  * probably want to avoid.
  193                                  * (20010421 jinmei@kame.net)
  194                                  */
  195                                 error = EINVAL;
  196                                 goto release;
  197                         } else
  198                                 af = AF_INET;
  199                 }
  200 
  201                 /* KAME hack: embed scopeid */
  202                 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
  203                         error = EINVAL;
  204                         goto release;
  205                 }
  206 
  207                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
  208                         laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
  209                                               in6p->in6p_moptions,
  210                                               &in6p->in6p_route,
  211                                               &in6p->in6p_laddr, &error);
  212                 } else
  213                         laddr = &in6p->in6p_laddr;      /* XXX */
  214                 if (laddr == NULL) {
  215                         if (error == 0)
  216                                 error = EADDRNOTAVAIL;
  217                         goto release;
  218                 }
  219                 if (in6p->in6p_lport == 0 &&
  220                     (error = in6_pcbsetport(laddr, in6p, p)) != 0)
  221                         goto release;
  222         } else {
  223                 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  224                         error = ENOTCONN;
  225                         goto release;
  226                 }
  227                 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
  228                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
  229                                 /*
  230                                  * XXX: this case would happen when the
  231                                  * application sets the V6ONLY flag after
  232                                  * connecting the foreign address.
  233                                  * Such applications should be fixed,
  234                                  * so we bark here.
  235                                  */
  236                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
  237                                     "option was set for a connected socket\n");
  238                                 error = EINVAL;
  239                                 goto release;
  240                         } else
  241                                 af = AF_INET;
  242                 }
  243                 laddr = &in6p->in6p_laddr;
  244                 faddr = &in6p->in6p_faddr;
  245                 fport = in6p->in6p_fport;
  246         }
  247 
  248         if (af == AF_INET)
  249                 hlen = sizeof(struct ip);
  250 
  251         /*
  252          * Calculate data length and get a mbuf
  253          * for UDP and IP6 headers.
  254          */
  255         M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
  256         if (m == 0) {
  257                 error = ENOBUFS;
  258                 goto release;
  259         }
  260 
  261         /*
  262          * Stuff checksum and output datagram.
  263          */
  264         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  265         udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
  266         udp6->uh_dport = fport;
  267         if (plen <= 0xffff)
  268                 udp6->uh_ulen = htons((u_short)plen);
  269         else
  270                 udp6->uh_ulen = 0;
  271         udp6->uh_sum = 0;
  272 
  273         switch (af) {
  274         case AF_INET6:
  275                 ip6 = mtod(m, struct ip6_hdr *);
  276                 ip6->ip6_flow   = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
  277                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  278                 ip6->ip6_vfc    |= IPV6_VERSION;
  279 #if 0                           /* ip6_plen will be filled in ip6_output. */
  280                 ip6->ip6_plen   = htons((u_short)plen);
  281 #endif
  282                 ip6->ip6_nxt    = IPPROTO_UDP;
  283                 ip6->ip6_hlim   = in6_selecthlim(in6p,
  284                                                  in6p->in6p_route.ro_rt ?
  285                                                  in6p->in6p_route.ro_rt->rt_ifp : NULL);
  286                 ip6->ip6_src    = *laddr;
  287                 ip6->ip6_dst    = *faddr;
  288 
  289                 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
  290                                 sizeof(struct ip6_hdr), plen)) == 0) {
  291                         udp6->uh_sum = 0xffff;
  292                 }
  293 
  294                 flags = 0;
  295 
  296                 udp6stat.udp6s_opackets++;
  297 #ifdef IPSEC
  298                 if (ipsec_bypass == 0 && ipsec_setsocket(m, in6p->in6p_socket) != 0) {
  299                         error = ENOBUFS;
  300                         goto release;
  301                 }
  302 #endif /*IPSEC*/
  303                 error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
  304                     flags, in6p->in6p_moptions, NULL);
  305                 break;
  306         case AF_INET:
  307                 error = EAFNOSUPPORT;
  308                 goto release;
  309         }
  310         goto releaseopt;
  311 
  312 release:
  313         m_freem(m);
  314 
  315 releaseopt:
  316         if (control) {
  317                 ip6_clearpktopts(in6p->in6p_outputopts, 0, -1);
  318                 in6p->in6p_outputopts = stickyopt;
  319                 m_freem(control);
  320         }
  321         return(error);
  322 }
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FreeBSD/Linux Kernel Cross Reference sys/bsd/netinet6/udp6_output.c

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sys/bsd/netinet6/udp6_output.c
