1 /* $OpenBSD: udp6_output.c,v 1.5 2001/12/06 04:19:26 itojun 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. 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/errno.h> 75 #include <sys/stat.h> 76 #include <sys/systm.h> 77 #include <sys/syslog.h> 78 79 #include <net/if.h> 80 #include <net/route.h> 81 #include <net/if_types.h> 82 83 #include <netinet/in.h> 84 #include <netinet/in_var.h> 85 #include <netinet/in_systm.h> 86 #include <netinet/ip.h> 87 #include <netinet/ip_var.h> 88 #include <netinet/in_pcb.h> 89 #include <netinet/udp.h> 90 #include <netinet/udp_var.h> 91 #include <netinet/ip6.h> 92 #include <netinet6/ip6_var.h> 93 #include <netinet/icmp6.h> 94 #include <netinet6/ip6protosw.h> 95 96 #include "faith.h" 97 98 /* 99 * UDP protocol inplementation. 100 * Per RFC 768, August, 1980. 101 */ 102 103 #define in6pcb inpcb 104 #define in6p_outputopts inp_outputopts6 105 #define in6p_socket inp_socket 106 #define in6p_faddr inp_faddr6 107 #define in6p_laddr inp_laddr6 108 #define in6p_fport inp_fport 109 #define in6p_lport inp_lport 110 #define in6p_flags inp_flags 111 #define in6p_moptions inp_moptions6 112 #define in6p_route inp_route6 113 #define in6p_flowinfo inp_flowinfo 114 #define udp6stat udpstat 115 #define udp6s_opackets udps_opackets 116 117 int 118 udp6_output(in6p, m, addr6, control) 119 struct in6pcb *in6p; 120 struct mbuf *m; 121 struct mbuf *addr6, *control; 122 { 123 u_int32_t ulen = m->m_pkthdr.len; 124 u_int32_t plen = sizeof(struct udphdr) + ulen; 125 struct ip6_hdr *ip6; 126 struct udphdr *udp6; 127 struct in6_addr *laddr, *faddr; 128 u_short fport; 129 int error = 0; 130 struct ip6_pktopts opt, *stickyopt; 131 int priv; 132 int af, hlen; 133 int flags; 134 struct sockaddr_in6 tmp; 135 136 priv = 0; 137 if ((in6p->in6p_socket->so_state & SS_PRIV) != 0) 138 priv = 1; 139 stickyopt = in6p->in6p_outputopts; 140 if (control) { 141 if ((error = ip6_setpktoptions(control, &opt, priv)) != 0) 142 goto release; 143 in6p->in6p_outputopts = &opt; 144 } 145 146 if (addr6) { 147 /* 148 * IPv4 version of udp_output calls in_pcbconnect in this case, 149 * which needs splnet and affects performance. 150 * Since we saw no essential reason for calling in_pcbconnect, 151 * we get rid of such kind of logic, and call in6_selectsrc 152 * and in6_pcbsetport in order to fill in the local address 153 * and the local port. 154 */ 155 struct sockaddr_in6 *sin6 = mtod(addr6, struct sockaddr_in6 *); 156 157 if (addr6->m_len != sizeof(*sin6)) { 158 error = EINVAL; 159 goto release; 160 } 161 if (sin6->sin6_family != AF_INET6) { 162 error = EAFNOSUPPORT; 163 goto release; 164 } 165 if (sin6->sin6_port == 0) { 166 error = EADDRNOTAVAIL; 167 goto release; 168 } 169 170 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 171 error = EISCONN; 172 goto release; 173 } 174 175 /* protect *sin6 from overwrites */ 176 tmp = *sin6; 177 sin6 = &tmp; 178 179 faddr = &sin6->sin6_addr; 180 fport = sin6->sin6_port; /* allow 0 port */ 181 182 /* KAME hack: embed scopeid */ 183 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) { 184 error = EINVAL; 185 goto release; 186 } 187 188 if (1) /* we don't support IPv4 mapped address */ 189 { 190 laddr = in6_selectsrc(sin6, in6p->in6p_outputopts, 191 in6p->in6p_moptions, 192 &in6p->in6p_route, 193 &in6p->in6p_laddr, &error); 194 } else 195 laddr = &in6p->in6p_laddr; /*XXX*/ 196 if (laddr == NULL) { 197 if (error == 0) 198 error = EADDRNOTAVAIL; 199 goto release; 200 } 201 if (in6p->in6p_lport == 0 && 202 (error = in6_pcbsetport(laddr, in6p)) != 0) 203 goto release; 204 } else { 205 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 206 error = ENOTCONN; 207 goto release; 208 } 209 laddr = &in6p->in6p_laddr; 210 faddr = &in6p->in6p_faddr; 211 fport = in6p->in6p_fport; 212 } 213 214 if (1) /* we don't support IPv4 mapped address */ 215 { 216 af = AF_INET6; 217 hlen = sizeof(struct ip6_hdr); 218 } else { 219 af = AF_INET; 220 hlen = sizeof(struct ip); 221 } 222 223 /* 224 * Calculate data length and get a mbuf 225 * for UDP and IP6 headers. 226 */ 227 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 228 if (m == 0) { 229 error = ENOBUFS; 230 goto release; 231 } 232 233 /* 234 * Stuff checksum and output datagram. 235 */ 236 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 237 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */ 238 udp6->uh_dport = fport; 239 if (plen <= 0xffff) 240 udp6->uh_ulen = htons((u_short)plen); 241 else 242 udp6->uh_ulen = 0; 243 udp6->uh_sum = 0; 244 245 switch (af) { 246 case AF_INET6: 247 ip6 = mtod(m, struct ip6_hdr *); 248 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK; 249 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 250 ip6->ip6_vfc |= IPV6_VERSION; 251 #if 0 /* ip6_plen will be filled in ip6_output. */ 252 ip6->ip6_plen = htons((u_short)plen); 253 #endif 254 ip6->ip6_nxt = IPPROTO_UDP; 255 ip6->ip6_hlim = in6_selecthlim(in6p, 256 in6p->in6p_route.ro_rt ? 257 in6p->in6p_route.ro_rt->rt_ifp : NULL); 258 ip6->ip6_src = *laddr; 259 ip6->ip6_dst = *faddr; 260 261 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP, 262 sizeof(struct ip6_hdr), plen)) == 0) { 263 udp6->uh_sum = 0xffff; 264 } 265 266 flags = 0; 267 #ifdef IPV6_MINMTU 268 if (in6p->in6p_flags & IN6P_MINMTU) 269 flags |= IPV6_MINMTU; 270 #endif 271 272 udp6stat.udp6s_opackets++; 273 error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route, 274 flags, in6p->in6p_moptions, NULL); 275 break; 276 case AF_INET: 277 error = EAFNOSUPPORT; 278 goto release; 279 } 280 goto releaseopt; 281 282 release: 283 m_freem(m); 284 285 releaseopt: 286 if (control) { 287 in6p->in6p_outputopts = stickyopt; 288 m_freem(control); 289 } 290 return(error); 291 } 292