udp6_output.c

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    1 /*      $OpenBSD: udp6_output.c,v 1.59 2022/02/22 01:35:41 guenther Exp $       */
    2 /*      $KAME: udp6_output.c,v 1.21 2001/02/07 11:51:54 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 
   62 #include "pf.h"
   63 
   64 #include <sys/param.h>
   65 #include <sys/mbuf.h>
   66 #include <sys/socket.h>
   67 #include <sys/socketvar.h>
   68 #include <sys/errno.h>
   69 #include <sys/stat.h>
   70 #include <sys/systm.h>
   71 #include <sys/syslog.h>
   72 
   73 #include <net/if.h>
   74 #include <net/if_var.h>
   75 #include <net/route.h>
   76 #if NPF > 0
   77 #include <net/pfvar.h>
   78 #endif
   79 
   80 #include <netinet/in.h>
   81 #include <netinet6/in6_var.h>
   82 #include <netinet/ip.h>
   83 #include <netinet/ip_var.h>
   84 #include <netinet/in_pcb.h>
   85 #include <netinet/udp.h>
   86 #include <netinet/udp_var.h>
   87 #include <netinet/ip6.h>
   88 #include <netinet6/ip6_var.h>
   89 #include <netinet/icmp6.h>
   90 
   91 /*
   92  * UDP protocol implementation.
   93  * Per RFC 768, August, 1980.
   94  */
   95 int
   96 udp6_output(struct inpcb *in6p, struct mbuf *m, struct mbuf *addr6,
   97         struct mbuf *control)
   98 {
   99         u_int32_t ulen = m->m_pkthdr.len;
  100         u_int32_t plen = sizeof(struct udphdr) + ulen;
  101         int error = 0, priv = 0, hlen, flags;
  102         struct ip6_hdr *ip6;
  103         struct udphdr *udp6;
  104         struct in6_addr *laddr, *faddr;
  105         struct ip6_pktopts *optp, opt;
  106         struct sockaddr_in6 tmp, valid;
  107         struct proc *p = curproc;       /* XXX */
  108         u_short fport;
  109 
  110         if ((in6p->inp_socket->so_state & SS_PRIV) != 0)
  111                 priv = 1;
  112         if (control) {
  113                 if ((error = ip6_setpktopts(control, &opt,
  114                     in6p->inp_outputopts6, priv, IPPROTO_UDP)) != 0)
  115                         goto release;
  116                 optp = &opt;
  117         } else
  118                 optp = in6p->inp_outputopts6;
  119 
  120         if (addr6) {
  121                 struct sockaddr_in6 *sin6;
  122 
  123                 if ((error = in6_nam2sin6(addr6, &sin6)))
  124                         goto release;
  125                 if (sin6->sin6_port == 0) {
  126                         error = EADDRNOTAVAIL;
  127                         goto release;
  128                 }
  129                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  130                         error = EADDRNOTAVAIL;
  131                         goto release;
  132                 }
  133                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->inp_faddr6)) {
  134                         error = EISCONN;
  135                         goto release;
  136                 }
  137 
  138                 /* protect *sin6 from overwrites */
  139                 tmp = *sin6;
  140                 sin6 = &tmp;
  141 
  142                 faddr = &sin6->sin6_addr;
  143                 fport = sin6->sin6_port; /* allow 0 port */
  144 
  145                 /* KAME hack: embed scopeid */
  146                 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p) != 0) {
  147                         error = EINVAL;
  148                         goto release;
  149                 }
  150 
  151                 error = in6_pcbselsrc(&laddr, sin6, in6p, optp);
  152                 if (error)
  153                         goto release;
  154 
  155                 if (in6p->inp_lport == 0){
  156                         error = in_pcbbind(in6p, NULL, p);
  157                         if (error)
  158                                 goto release;
  159                 }
  160 
  161                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->inp_laddr6) &&
  162                     !IN6_ARE_ADDR_EQUAL(&in6p->inp_laddr6, laddr)) {
  163                         valid.sin6_addr = *laddr;
  164                         valid.sin6_port = in6p->inp_lport;
  165                         valid.sin6_scope_id = 0;
  166                         valid.sin6_family = AF_INET6;
  167                         valid.sin6_len = sizeof(valid);
  168                         error = in6_pcbaddrisavail(in6p, &valid, 0, p);
  169                         if (error)
  170                                 goto release;
  171                 }
  172         } else {
  173                 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->inp_faddr6)) {
  174                         error = ENOTCONN;
  175                         goto release;
  176                 }
  177                 laddr = &in6p->inp_laddr6;
  178                 faddr = &in6p->inp_faddr6;
  179                 fport = in6p->inp_fport;
  180         }
  181 
  182         hlen = sizeof(struct ip6_hdr);
  183 
  184         /*
  185          * Calculate data length and get a mbuf
  186          * for UDP and IP6 headers.
  187          */
  188         M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
  189         if (m == NULL) {
  190                 error = ENOBUFS;
  191                 goto releaseopt;
  192         }
  193 
  194         /*
  195          * Stuff checksum and output datagram.
  196          */
  197         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  198         udp6->uh_sport = in6p->inp_lport; /* lport is always set in the PCB */
  199         udp6->uh_dport = fport;
  200         if (plen <= 0xffff)
  201                 udp6->uh_ulen = htons((u_short)plen);
  202         else
  203                 udp6->uh_ulen = 0;
  204         udp6->uh_sum = 0;
  205 
  206         ip6 = mtod(m, struct ip6_hdr *);
  207         ip6->ip6_flow   = in6p->inp_flowinfo & IPV6_FLOWINFO_MASK;
  208         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  209         ip6->ip6_vfc    |= IPV6_VERSION;
  210 #if 0   /* ip6_plen will be filled in ip6_output. */
  211         ip6->ip6_plen   = htons((u_short)plen);
  212 #endif
  213         ip6->ip6_nxt    = IPPROTO_UDP;
  214         ip6->ip6_hlim   = in6_selecthlim(in6p);
  215         ip6->ip6_src    = *laddr;
  216         ip6->ip6_dst    = *faddr;
  217 
  218         m->m_pkthdr.csum_flags |= M_UDP_CSUM_OUT;
  219 
  220         flags = 0;
  221         if (in6p->inp_flags & IN6P_MINMTU)
  222                 flags |= IPV6_MINMTU;
  223 
  224         udpstat_inc(udps_opackets);
  225 
  226         /* force routing table */
  227         m->m_pkthdr.ph_rtableid = in6p->inp_rtableid;
  228 
  229 #if NPF > 0
  230         if (in6p->inp_socket->so_state & SS_ISCONNECTED)
  231                 pf_mbuf_link_inpcb(m, in6p);
  232 #endif
  233 
  234         error = ip6_output(m, optp, &in6p->inp_route6,
  235             flags, in6p->inp_moptions6, in6p);
  236         goto releaseopt;
  237 
  238 release:
  239         m_freem(m);
  240 
  241 releaseopt:
  242         if (control) {
  243                 ip6_clearpktopts(&opt, -1);
  244                 m_freem(control);
  245         }
  246         return (error);
  247 }

Cache object: 703f91944effa7d87fa38ddd45d63be0

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

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