1 /* $OpenBSD: udp6_output.c,v 1.23 2013/10/23 19:57:50 deraadt 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 <sys/param.h> 63 #include <sys/malloc.h> 64 #include <sys/mbuf.h> 65 #include <sys/protosw.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/route.h> 75 #include <net/if_types.h> 76 77 #include <netinet/in.h> 78 #include <netinet6/in6_var.h> 79 #include <netinet/in_systm.h> 80 #include <netinet/ip.h> 81 #include <netinet/ip_var.h> 82 #include <netinet/in_pcb.h> 83 #include <netinet/udp.h> 84 #include <netinet/udp_var.h> 85 #include <netinet/ip6.h> 86 #include <netinet6/ip6_var.h> 87 #include <netinet/icmp6.h> 88 #include <netinet6/ip6protosw.h> 89 90 /* 91 * UDP protocol inplementation. 92 * Per RFC 768, August, 1980. 93 */ 94 int 95 udp6_output(struct inpcb *in6p, struct mbuf *m, struct mbuf *addr6, 96 struct mbuf *control) 97 { 98 u_int32_t ulen = m->m_pkthdr.len; 99 u_int32_t plen = sizeof(struct udphdr) + ulen; 100 int error = 0, priv = 0, af, hlen, flags; 101 struct ip6_hdr *ip6; 102 struct udphdr *udp6; 103 struct in6_addr *laddr, *faddr; 104 struct ip6_pktopts *optp, opt; 105 struct sockaddr_in6 tmp; 106 struct proc *p = curproc; /* XXX */ 107 struct ifnet *ifp; 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 /* 122 * IPv4 version of udp_output calls in_pcbconnect in this case, 123 * which needs splnet and affects performance. 124 * Since we saw no essential reason for calling in_pcbconnect, 125 * we get rid of such kind of logic, and call in6_selectsrc 126 * and in6_pcbsetport in order to fill in the local address 127 * and the local port. 128 */ 129 struct sockaddr_in6 *sin6 = mtod(addr6, struct sockaddr_in6 *); 130 131 if (addr6->m_len != sizeof(*sin6)) { 132 error = EINVAL; 133 goto release; 134 } 135 if (sin6->sin6_family != AF_INET6) { 136 error = EAFNOSUPPORT; 137 goto release; 138 } 139 if (sin6->sin6_port == 0) { 140 error = EADDRNOTAVAIL; 141 goto release; 142 } 143 144 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->inp_faddr6)) { 145 error = EISCONN; 146 goto release; 147 } 148 149 /* protect *sin6 from overwrites */ 150 tmp = *sin6; 151 sin6 = &tmp; 152 153 faddr = &sin6->sin6_addr; 154 fport = sin6->sin6_port; /* allow 0 port */ 155 156 /* KAME hack: embed scopeid */ 157 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) { 158 error = EINVAL; 159 goto release; 160 } 161 162 if (1) { /* we don't support IPv4 mapped address */ 163 laddr = in6_selectsrc(sin6, optp, 164 in6p->inp_moptions6, &in6p->inp_route6, 165 &in6p->inp_laddr6, &error, in6p->inp_rtableid); 166 } else 167 laddr = &in6p->inp_laddr6; /*XXX*/ 168 if (laddr == NULL) { 169 if (error == 0) 170 error = EADDRNOTAVAIL; 171 goto release; 172 } 173 if (in6p->inp_lport == 0 && 174 (error = in6_pcbsetport(laddr, in6p, p)) != 0) 175 goto release; 176 } else { 177 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->inp_faddr6)) { 178 error = ENOTCONN; 179 goto release; 180 } 181 laddr = &in6p->inp_laddr6; 182 faddr = &in6p->inp_faddr6; 183 fport = in6p->inp_fport; 184 } 185 186 if (1) { /* we don't support IPv4 mapped address */ 187 af = AF_INET6; 188 hlen = sizeof(struct ip6_hdr); 189 } else { 190 af = AF_INET; 191 hlen = sizeof(struct ip); 192 } 193 194 /* 195 * Calculate data length and get a mbuf 196 * for UDP and IP6 headers. 197 */ 198 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 199 if (m == 0) { 200 error = ENOBUFS; 201 goto release; 202 } 203 204 /* 205 * Stuff checksum and output datagram. 206 */ 207 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 208 udp6->uh_sport = in6p->inp_lport; /* lport is always set in the PCB */ 209 udp6->uh_dport = fport; 210 if (plen <= 0xffff) 211 udp6->uh_ulen = htons((u_short)plen); 212 else 213 udp6->uh_ulen = 0; 214 udp6->uh_sum = 0; 215 216 switch (af) { 217 case AF_INET6: 218 ip6 = mtod(m, struct ip6_hdr *); 219 ip6->ip6_flow = in6p->inp_flowinfo & IPV6_FLOWINFO_MASK; 220 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 221 ip6->ip6_vfc |= IPV6_VERSION; 222 #if 0 /* ip6_plen will be filled in ip6_output. */ 223 ip6->ip6_plen = htons((u_short)plen); 224 #endif 225 ip6->ip6_nxt = IPPROTO_UDP; 226 ifp = NULL; 227 if (in6p->inp_route6.ro_rt && 228 in6p->inp_route6.ro_rt->rt_flags & RTF_UP) 229 ifp = in6p->inp_route6.ro_rt->rt_ifp; 230 ip6->ip6_hlim = in6_selecthlim(in6p, ifp); 231 ip6->ip6_src = *laddr; 232 ip6->ip6_dst = *faddr; 233 234 m->m_pkthdr.csum_flags |= M_UDP_CSUM_OUT; 235 236 flags = 0; 237 if (in6p->inp_flags & IN6P_MINMTU) 238 flags |= IPV6_MINMTU; 239 240 udpstat.udps_opackets++; 241 242 /* force routing domain */ 243 m->m_pkthdr.rdomain = in6p->inp_rtableid; 244 245 error = ip6_output(m, optp, &in6p->inp_route6, 246 flags, in6p->inp_moptions6, NULL, in6p); 247 break; 248 case AF_INET: 249 error = EAFNOSUPPORT; 250 goto release; 251 } 252 goto releaseopt; 253 254 release: 255 m_freem(m); 256 257 releaseopt: 258 if (control) { 259 ip6_clearpktopts(&opt, -1); 260 m_freem(control); 261 } 262 return (error); 263 } 264