1 /* $OpenBSD: udp6_output.c,v 1.57 2021/03/10 10:21:49 jsg 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/protosw.h> 67 #include <sys/socket.h> 68 #include <sys/socketvar.h> 69 #include <sys/errno.h> 70 #include <sys/stat.h> 71 #include <sys/systm.h> 72 #include <sys/syslog.h> 73 74 #include <net/if.h> 75 #include <net/if_var.h> 76 #include <net/route.h> 77 #if NPF > 0 78 #include <net/pfvar.h> 79 #endif 80 81 #include <netinet/in.h> 82 #include <netinet6/in6_var.h> 83 #include <netinet/ip.h> 84 #include <netinet/ip_var.h> 85 #include <netinet/in_pcb.h> 86 #include <netinet/udp.h> 87 #include <netinet/udp_var.h> 88 #include <netinet/ip6.h> 89 #include <netinet6/ip6_var.h> 90 #include <netinet/icmp6.h> 91 #include <netinet6/ip6protosw.h> 92 93 /* 94 * UDP protocol implementation. 95 * Per RFC 768, August, 1980. 96 */ 97 int 98 udp6_output(struct inpcb *in6p, struct mbuf *m, struct mbuf *addr6, 99 struct mbuf *control) 100 { 101 u_int32_t ulen = m->m_pkthdr.len; 102 u_int32_t plen = sizeof(struct udphdr) + ulen; 103 int error = 0, priv = 0, hlen, flags; 104 struct ip6_hdr *ip6; 105 struct udphdr *udp6; 106 struct in6_addr *laddr, *faddr; 107 struct ip6_pktopts *optp, opt; 108 struct sockaddr_in6 tmp, valid; 109 struct proc *p = curproc; /* XXX */ 110 u_short fport; 111 112 if ((in6p->inp_socket->so_state & SS_PRIV) != 0) 113 priv = 1; 114 if (control) { 115 if ((error = ip6_setpktopts(control, &opt, 116 in6p->inp_outputopts6, priv, IPPROTO_UDP)) != 0) 117 goto release; 118 optp = &opt; 119 } else 120 optp = in6p->inp_outputopts6; 121 122 if (addr6) { 123 struct sockaddr_in6 *sin6; 124 125 if ((error = in6_nam2sin6(addr6, &sin6))) 126 goto release; 127 if (sin6->sin6_port == 0) { 128 error = EADDRNOTAVAIL; 129 goto release; 130 } 131 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 132 error = EADDRNOTAVAIL; 133 goto release; 134 } 135 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->inp_faddr6)) { 136 error = EISCONN; 137 goto release; 138 } 139 140 /* protect *sin6 from overwrites */ 141 tmp = *sin6; 142 sin6 = &tmp; 143 144 faddr = &sin6->sin6_addr; 145 fport = sin6->sin6_port; /* allow 0 port */ 146 147 /* KAME hack: embed scopeid */ 148 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p) != 0) { 149 error = EINVAL; 150 goto release; 151 } 152 153 error = in6_pcbselsrc(&laddr, sin6, in6p, optp); 154 if (error) 155 goto release; 156 157 if (in6p->inp_lport == 0){ 158 error = in_pcbbind(in6p, NULL, p); 159 if (error) 160 goto release; 161 } 162 163 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->inp_laddr6) && 164 !IN6_ARE_ADDR_EQUAL(&in6p->inp_laddr6, laddr)) { 165 valid.sin6_addr = *laddr; 166 valid.sin6_port = in6p->inp_lport; 167 valid.sin6_scope_id = 0; 168 valid.sin6_family = AF_INET6; 169 valid.sin6_len = sizeof(valid); 170 error = in6_pcbaddrisavail(in6p, &valid, 0, p); 171 if (error) 172 goto release; 173 } 174 } else { 175 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->inp_faddr6)) { 176 error = ENOTCONN; 177 goto release; 178 } 179 laddr = &in6p->inp_laddr6; 180 faddr = &in6p->inp_faddr6; 181 fport = in6p->inp_fport; 182 } 183 184 hlen = sizeof(struct ip6_hdr); 185 186 /* 187 * Calculate data length and get a mbuf 188 * for UDP and IP6 headers. 189 */ 190 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 191 if (m == NULL) { 192 error = ENOBUFS; 193 goto releaseopt; 194 } 195 196 /* 197 * Stuff checksum and output datagram. 198 */ 199 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 200 udp6->uh_sport = in6p->inp_lport; /* lport is always set in the PCB */ 201 udp6->uh_dport = fport; 202 if (plen <= 0xffff) 203 udp6->uh_ulen = htons((u_short)plen); 204 else 205 udp6->uh_ulen = 0; 206 udp6->uh_sum = 0; 207 208 ip6 = mtod(m, struct ip6_hdr *); 209 ip6->ip6_flow = in6p->inp_flowinfo & IPV6_FLOWINFO_MASK; 210 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 211 ip6->ip6_vfc |= IPV6_VERSION; 212 #if 0 /* ip6_plen will be filled in ip6_output. */ 213 ip6->ip6_plen = htons((u_short)plen); 214 #endif 215 ip6->ip6_nxt = IPPROTO_UDP; 216 ip6->ip6_hlim = in6_selecthlim(in6p); 217 ip6->ip6_src = *laddr; 218 ip6->ip6_dst = *faddr; 219 220 m->m_pkthdr.csum_flags |= M_UDP_CSUM_OUT; 221 222 flags = 0; 223 if (in6p->inp_flags & IN6P_MINMTU) 224 flags |= IPV6_MINMTU; 225 226 udpstat_inc(udps_opackets); 227 228 /* force routing table */ 229 m->m_pkthdr.ph_rtableid = in6p->inp_rtableid; 230 231 #if NPF > 0 232 if (in6p->inp_socket->so_state & SS_ISCONNECTED) 233 pf_mbuf_link_inpcb(m, in6p); 234 #endif 235 236 error = ip6_output(m, optp, &in6p->inp_route6, 237 flags, in6p->inp_moptions6, in6p); 238 goto releaseopt; 239 240 release: 241 m_freem(m); 242 243 releaseopt: 244 if (control) { 245 ip6_clearpktopts(&opt, -1); 246 m_freem(control); 247 } 248 return (error); 249 } 250