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 static __inline__ u_int16_t
 122 get_socket_id(struct socket * s)
 123 {
 124         u_int16_t               val;
 125
 126         if (s == NULL) {
 127             return (0);
 128         }
 129         val = (u_int16_t)(((u_int32_t)s) / sizeof(struct socket));
 130         if (val == 0) {
 131                 val = 0xffff;
 132         }
 133         return (val);
 134 }
 135
 136 int
 137 udp6_output(in6p, m, addr6, control, p)
 138         struct in6pcb *in6p;
 139         struct mbuf *m;
 140         struct mbuf *control;
 141         struct sockaddr *addr6;
 142         struct proc *p;
 143 {
 144         u_int32_t ulen = m->m_pkthdr.len;
 145         u_int32_t plen = sizeof(struct udphdr) + ulen;
 146         struct ip6_hdr *ip6;
 147         struct udphdr *udp6;
 148         struct in6_addr *laddr, *faddr;
 149         u_short fport;
 150         int error = 0;
 151         struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
 152         int priv;
 153         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
 154         int flags;
 155         struct sockaddr_in6 tmp;
 156         struct  in6_addr storage;
 157
 158         priv = 0;
 159 #ifdef __APPLE__
 160         if (p && !proc_suser(p))
 161 #else
 162         if (p && !suser(p))
 163 #endif
 164                 priv = 1;
 165         if (control) {
 166                 if ((error = ip6_setpktoptions(control, &opt, priv, 0)) != 0)
 167                         goto release;
 168                 in6p->in6p_outputopts = &opt;
 169         }
 170
 171         if (addr6) {
 172                 /*
 173                  * IPv4 version of udp_output calls in_pcbconnect in this case,
 174                  * which needs splnet and affects performance.
 175                  * Since we saw no essential reason for calling in_pcbconnect,
 176                  * we get rid of such kind of logic, and call in6_selectsrc
 177                  * and in6_pcbsetport in order to fill in the local address
 178                  * and the local port.
 179                  */
 180                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
 181                 if (sin6->sin6_port == 0) {
 182                         error = EADDRNOTAVAIL;
 183                         goto release;
 184                 }
 185
 186                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 187                         /* how about ::ffff:0.0.0.0 case? */
 188                         error = EISCONN;
 189                         goto release;
 190                 }
 191
 192                 /* protect *sin6 from overwrites */
 193                 tmp = *sin6;
 194                 sin6 = &tmp;
 195
 196                 faddr = &sin6->sin6_addr;
 197                 fport = sin6->sin6_port; /* allow 0 port */
 198
 199                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
 200                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
 201                                 /*
 202                                  * I believe we should explicitly discard the
 203                                  * packet when mapped addresses are disabled,
 204                                  * rather than send the packet as an IPv6 one.
 205                                  * If we chose the latter approach, the packet
 206                                  * might be sent out on the wire based on the
 207                                  * default route, the situation which we'd
 208                                  * probably want to avoid.
 209                                  * (20010421 jinmei@kame.net)
 210                                  */
 211                                 error = EINVAL;
 212                                 goto release;
 213                         } else
 214                                 af = AF_INET;
 215                 }
 216
 217                 /* KAME hack: embed scopeid */
 218                 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
 219                         error = EINVAL;
 220                         goto release;
 221                 }
 222
 223                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
 224                         laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
 225                                               in6p->in6p_moptions,
 226                                               &in6p->in6p_route,
 227                                               &in6p->in6p_laddr, &storage, &error);
 228                 } else
 229                         laddr = &in6p->in6p_laddr;      /* XXX */
 230                 if (laddr == NULL) {
 231                         if (error == 0)
 232                                 error = EADDRNOTAVAIL;
 233                         goto release;
 234                 }
 235                 if (in6p->in6p_lport == 0 &&
 236                     (error = in6_pcbsetport(laddr, in6p, p, 0)) != 0)
 237                         goto release;
 238         } else {
 239                 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 240                         error = ENOTCONN;
 241                         goto release;
 242                 }
 243                 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
 244                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
 245                                 /*
 246                                  * XXX: this case would happen when the
 247                                  * application sets the V6ONLY flag after
 248                                  * connecting the foreign address.
 249                                  * Such applications should be fixed,
 250                                  * so we bark here.
 251                                  */
 252                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
 253                                     "option was set for a connected socket\n");
 254                                 error = EINVAL;
 255                                 goto release;
 256                         } else
 257                                 af = AF_INET;
 258                 }
 259                 laddr = &in6p->in6p_laddr;
 260                 faddr = &in6p->in6p_faddr;
 261                 fport = in6p->in6p_fport;
 262         }
 263
 264         if (af == AF_INET)
 265                 hlen = sizeof(struct ip);
 266
 267         /*
 268          * Calculate data length and get a mbuf
 269          * for UDP and IP6 headers.
 270          */
 271         M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
 272         if (m == 0) {
 273                 error = ENOBUFS;
 274                 goto release;
 275         }
 276
 277         /*
 278          * Stuff checksum and output datagram.
 279          */
 280         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
 281         udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
 282         udp6->uh_dport = fport;
 283         if (plen <= 0xffff)
 284                 udp6->uh_ulen = htons((u_short)plen);
 285         else
 286                 udp6->uh_ulen = 0;
 287         udp6->uh_sum = 0;
 288
 289         switch (af) {
 290         case AF_INET6:
 291                 ip6 = mtod(m, struct ip6_hdr *);
 292                 ip6->ip6_flow   = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
 293                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
 294                 ip6->ip6_vfc    |= IPV6_VERSION;
 295 #if 0                           /* ip6_plen will be filled in ip6_output. */
 296                 ip6->ip6_plen   = htons((u_short)plen);
 297 #endif
 298                 ip6->ip6_nxt    = IPPROTO_UDP;
 299                 ip6->ip6_hlim   = in6_selecthlim(in6p,
 300                                                  in6p->in6p_route.ro_rt ?
 301                                                  in6p->in6p_route.ro_rt->rt_ifp : NULL);
 302                 ip6->ip6_src    = *laddr;
 303                 ip6->ip6_dst    = *faddr;
 304
 305                 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
 306                                 sizeof(struct ip6_hdr), plen)) == 0) {
 307                         udp6->uh_sum = 0xffff;
 308                 }
 309
 310                 flags = 0;
 311
 312                 udp6stat.udp6s_opackets++;
 313 #ifdef IPSEC
 314                 if (ipsec_bypass == 0 && ipsec_setsocket(m, in6p->in6p_socket) != 0) {
 315                         error = ENOBUFS;
 316                         goto release;
 317                 }
 318 #endif /*IPSEC*/
 319                 m->m_pkthdr.socket_id = get_socket_id(in6p->in6p_socket);
 320                 error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
 321                     flags, in6p->in6p_moptions, NULL, 0);
 322                 break;
 323         case AF_INET:
 324                 error = EAFNOSUPPORT;
 325                 goto release;
 326         }
 327         goto releaseopt;
 328
 329 release:
 330         m_freem(m);
 331
 332 releaseopt:
 333         if (control) {
 334                 ip6_clearpktopts(in6p->in6p_outputopts, 0, -1);
 335                 in6p->in6p_outputopts = stickyopt;
 336                 m_freem(control);
 337         }
 338         return(error);
 339 }