bsd/netinet6/udp6_output.c

   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 }