udp6_output.c

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    1 /*      $NetBSD: udp6_output.c,v 1.17.2.1 2004/06/14 18:00:48 tron Exp $        */
    2 /*      $KAME: udp6_output.c,v 1.43 2001/10/15 09:19:52 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_output.c,v 1.17.2.1 2004/06/14 18:00:48 tron Exp $");
   66 
   67 #include "opt_inet.h"
   68 
   69 #include <sys/param.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/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 #include "faith.h"
  101 
  102 #include <net/net_osdep.h>
  103 
  104 /*
  105  * UDP protocol inplementation.
  106  * Per RFC 768, August, 1980.
  107  */
  108 
  109 int
  110 udp6_output(in6p, m, addr6, control, p)
  111         struct in6pcb *in6p;
  112         struct mbuf *m;
  113         struct mbuf *addr6, *control;
  114         struct proc *p;
  115 {
  116         u_int32_t ulen = m->m_pkthdr.len;
  117         u_int32_t plen = sizeof(struct udphdr) + ulen;
  118         struct ip6_hdr *ip6;
  119         struct udphdr *udp6;
  120         struct in6_addr *laddr, *faddr;
  121         struct in6_addr laddr_mapped; /* XXX ugly */
  122         u_int16_t fport;
  123         int error = 0;
  124         struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
  125         int priv;
  126         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
  127 #ifdef INET
  128         struct ip *ip;
  129         struct udpiphdr *ui;
  130 #endif
  131         int flags = 0;
  132         struct sockaddr_in6 tmp;
  133 
  134         priv = 0;
  135         if (p && !suser(p->p_ucred, &p->p_acflag))
  136                 priv = 1;
  137         if (control) {
  138                 if ((error = ip6_setpktoptions(control, &opt, priv)) != 0)
  139                         goto release;
  140                 in6p->in6p_outputopts = &opt;
  141         }
  142 
  143         if (addr6) {
  144                 /*
  145                  * IPv4 version of udp_output calls in_pcbconnect in this case,
  146                  * which needs splnet and affects performance.
  147                  * Since we saw no essential reason for calling in_pcbconnect,
  148                  * we get rid of such kind of logic, and call in6_selectsrc
  149                  * and in6_pcbsetport in order to fill in the local address
  150                  * and the local port.
  151                  */
  152                 struct sockaddr_in6 *sin6 = mtod(addr6, struct sockaddr_in6 *);
  153 
  154                 if (addr6->m_len != sizeof(*sin6)) {
  155                         error = EINVAL;
  156                         goto release;
  157                 }
  158                 if (sin6->sin6_family != AF_INET6) {
  159                         error = EAFNOSUPPORT;
  160                         goto release;
  161                 }
  162                 if (sin6->sin6_port == 0) {
  163                         error = EADDRNOTAVAIL;
  164                         goto release;
  165                 }
  166 
  167                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  168                         /* how about ::ffff:0.0.0.0 case? */
  169                         error = EISCONN;
  170                         goto release;
  171                 }
  172 
  173                 /* protect *sin6 from overwrites */
  174                 tmp = *sin6;
  175                 sin6 = &tmp;
  176 
  177                 faddr = &sin6->sin6_addr;
  178                 fport = sin6->sin6_port; /* allow 0 port */
  179 
  180                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
  181                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY))
  182                         {
  183                                 /*
  184                                  * I believe we should explicitly discard the
  185                                  * packet when mapped addresses are disabled,
  186                                  * rather than send the packet as an IPv6 one.
  187                                  * If we chose the latter approach, the packet
  188                                  * might be sent out on the wire based on the
  189                                  * default route, the situation which we'd
  190                                  * probably want to avoid.
  191                                  * (20010421 jinmei@kame.net)
  192                                  */
  193                                 error = EINVAL;
  194                                 goto release;
  195                         }
  196                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)
  197                             && !IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) {
  198                                 /*
  199                                  * when remote addr is an IPv4-mapped address,
  200                                  * local addr should not be an IPv6 address,
  201                                  * since you cannot determine how to map IPv6
  202                                  * source address to IPv4.
  203                                  */
  204                                 error = EINVAL;
  205                                 goto release;
  206                         }
  207 
  208                         af = AF_INET;
  209                 }
  210 
  211                 /* KAME hack: embed scopeid */
  212                 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
  213                         error = EINVAL;
  214                         goto release;
  215                 }
  216 
  217                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
  218                         laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
  219                                               in6p->in6p_moptions,
  220                                               &in6p->in6p_route,
  221                                               &in6p->in6p_laddr, &error);
  222                 } else {
  223                         /*
  224                          * XXX: freebsd[34] does not have in_selectsrc, but
  225                          * we can omit the whole part because freebsd4 calls
  226                          * udp_output() directly in this case, and thus we'll
  227                          * never see this path.
  228                          */
  229                         if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
  230                                 struct sockaddr_in *sinp, sin_dst;
  231 
  232                                 bzero(&sin_dst, sizeof(sin_dst));
  233                                 sin_dst.sin_family = AF_INET;
  234                                 sin_dst.sin_len = sizeof(sin_dst);
  235                                 bcopy(&faddr->s6_addr[12], &sin_dst.sin_addr,
  236                                       sizeof(sin_dst.sin_addr));
  237                                 sinp = in_selectsrc(&sin_dst,
  238                                                     (struct route *)&in6p->in6p_route,
  239                                                     in6p->in6p_socket->so_options,
  240                                                     NULL, &error);
  241                                 if (sinp == NULL) {
  242                                         if (error == 0)
  243                                                 error = EADDRNOTAVAIL;
  244                                         goto release;
  245                                 }
  246                                 bzero(&laddr_mapped, sizeof(laddr_mapped));
  247                                 laddr_mapped.s6_addr16[5] = 0xffff; /* ugly */
  248                                 bcopy(&sinp->sin_addr,
  249                                       &laddr_mapped.s6_addr[12],
  250                                       sizeof(sinp->sin_addr));
  251                                 laddr = &laddr_mapped;
  252                         } else
  253                         {
  254                                 laddr = &in6p->in6p_laddr;      /* XXX */
  255                         }
  256                 }
  257                 if (laddr == NULL) {
  258                         if (error == 0)
  259                                 error = EADDRNOTAVAIL;
  260                         goto release;
  261                 }
  262                 if (in6p->in6p_lport == 0 &&
  263                     (error = in6_pcbsetport(laddr, in6p, p)) != 0)
  264                         goto release;
  265         } else {
  266                 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  267                         error = ENOTCONN;
  268                         goto release;
  269                 }
  270                 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
  271                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY))
  272                         {
  273                                 /*
  274                                  * XXX: this case would happen when the
  275                                  * application sets the V6ONLY flag after
  276                                  * connecting the foreign address.
  277                                  * Such applications should be fixed,
  278                                  * so we bark here.
  279                                  */
  280                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
  281                                     "option was set for a connected socket\n");
  282                                 error = EINVAL;
  283                                 goto release;
  284                         } else
  285                                 af = AF_INET;
  286                 }
  287                 laddr = &in6p->in6p_laddr;
  288                 faddr = &in6p->in6p_faddr;
  289                 fport = in6p->in6p_fport;
  290         }
  291 
  292         if (af == AF_INET)
  293                 hlen = sizeof(struct ip);
  294 
  295         /*
  296          * Calculate data length and get a mbuf
  297          * for UDP and IP6 headers.
  298          */
  299         M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
  300         if (m == 0) {
  301                 error = ENOBUFS;
  302                 goto release;
  303         }
  304 
  305         /*
  306          * Stuff checksum and output datagram.
  307          */
  308         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  309         udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
  310         udp6->uh_dport = fport;
  311         if (plen <= 0xffff)
  312                 udp6->uh_ulen = htons((u_int16_t)plen);
  313         else
  314                 udp6->uh_ulen = 0;
  315         udp6->uh_sum = 0;
  316 
  317         switch (af) {
  318         case AF_INET6:
  319                 ip6 = mtod(m, struct ip6_hdr *);
  320                 ip6->ip6_flow   = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
  321                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  322                 ip6->ip6_vfc    |= IPV6_VERSION;
  323 #if 0                           /* ip6_plen will be filled in ip6_output. */
  324                 ip6->ip6_plen   = htons((u_int16_t)plen);
  325 #endif
  326                 ip6->ip6_nxt    = IPPROTO_UDP;
  327                 ip6->ip6_hlim   = in6_selecthlim(in6p,
  328                                                  in6p->in6p_route.ro_rt ?
  329                                                  in6p->in6p_route.ro_rt->rt_ifp : NULL);
  330                 ip6->ip6_src    = *laddr;
  331                 ip6->ip6_dst    = *faddr;
  332 
  333                 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
  334                                 sizeof(struct ip6_hdr), plen)) == 0) {
  335                         udp6->uh_sum = 0xffff;
  336                 }
  337 
  338                 if (in6p->in6p_flags & IN6P_MINMTU)
  339                         flags |= IPV6_MINMTU;
  340 
  341                 udp6stat.udp6s_opackets++;
  342                 error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
  343                     flags, in6p->in6p_moptions, in6p->in6p_socket, NULL);
  344                 break;
  345         case AF_INET:
  346 #ifdef INET
  347                 /* can't transmit jumbogram over IPv4 */
  348                 if (plen > 0xffff) {
  349                         error = EMSGSIZE;
  350                         goto release;
  351                 }
  352 
  353                 ip = mtod(m, struct ip *);
  354                 ui = (struct udpiphdr *)ip;
  355                 bzero(ui->ui_x1, sizeof ui->ui_x1);
  356                 ui->ui_pr = IPPROTO_UDP;
  357                 ui->ui_len = htons(plen);
  358                 bcopy(&laddr->s6_addr[12], &ui->ui_src, sizeof(ui->ui_src));
  359                 ui->ui_ulen = ui->ui_len;
  360 
  361                 flags = (in6p->in6p_socket->so_options &
  362                          (SO_DONTROUTE | SO_BROADCAST));
  363                 bcopy(&faddr->s6_addr[12], &ui->ui_dst, sizeof(ui->ui_dst));
  364                 udp6->uh_sum = in_cksum(m, hlen + plen);
  365                 if (udp6->uh_sum == 0)
  366                         udp6->uh_sum = 0xffff;
  367 
  368                 ip->ip_len = htons(hlen + plen);
  369                 ip->ip_ttl = in6_selecthlim(in6p, NULL); /* XXX */
  370                 ip->ip_tos = 0; /* XXX */
  371 
  372                 udpstat.udps_opackets++;
  373                 error = ip_output(m, NULL, &in6p->in6p_route, flags /* XXX */,
  374                     (struct ip_moptions *)NULL,
  375                     (struct socket *)in6p->in6p_socket);
  376                 break;
  377 #else
  378                 error = EAFNOSUPPORT;
  379                 goto release;
  380 #endif
  381         }
  382         goto releaseopt;
  383 
  384 release:
  385         m_freem(m);
  386 
  387 releaseopt:
  388         if (control) {
  389                 in6p->in6p_outputopts = stickyopt;
  390                 m_freem(control);
  391         }
  392         return (error);
  393 }
Cache object: cedfb41eb4649d90f5ced407a9623fde
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/udp6_output.c

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