1 /* $OpenBSD: udp6_output.c,v 1.65 2024/04/17 20:48:51 bluhm 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/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/if_var.h>
75 #include <net/route.h>
76 #if NPF > 0
77 #include <net/pfvar.h>
78 #endif
79
80 #include <netinet/in.h>
81 #include <netinet6/in6_var.h>
82 #include <netinet/ip.h>
83 #include <netinet/ip_var.h>
84 #include <netinet/in_pcb.h>
85 #include <netinet/udp.h>
86 #include <netinet/udp_var.h>
87 #include <netinet/ip6.h>
88 #include <netinet6/ip6_var.h>
89 #include <netinet/icmp6.h>
90
91 /*
92 * UDP protocol implementation.
93 * Per RFC 768, August, 1980.
94 */
95 int
udp6_output(struct inpcb * inp,struct mbuf * m,struct mbuf * addr6,struct mbuf * control)96 udp6_output(struct inpcb *inp, struct mbuf *m, struct mbuf *addr6,
97 struct mbuf *control)
98 {
99 u_int32_t ulen = m->m_pkthdr.len;
100 u_int32_t plen = sizeof(struct udphdr) + ulen;
101 int error = 0, priv = 0, hlen, flags;
102 struct ip6_hdr *ip6;
103 struct udphdr *udp6;
104 const struct in6_addr *laddr, *faddr;
105 struct ip6_pktopts *optp, opt;
106 struct sockaddr_in6 tmp, valid;
107 struct proc *p = curproc; /* XXX */
108 u_short fport;
109
110 if ((inp->inp_socket->so_state & SS_PRIV) != 0)
111 priv = 1;
112 if (control) {
113 if ((error = ip6_setpktopts(control, &opt,
114 inp->inp_outputopts6, priv, IPPROTO_UDP)) != 0)
115 goto release;
116 optp = &opt;
117 } else
118 optp = inp->inp_outputopts6;
119
120 if (addr6) {
121 struct sockaddr_in6 *sin6;
122
123 if ((error = in6_nam2sin6(addr6, &sin6)))
124 goto release;
125 if (sin6->sin6_port == 0) {
126 error = EADDRNOTAVAIL;
127 goto release;
128 }
129 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
130 error = EADDRNOTAVAIL;
131 goto release;
132 }
133 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) {
134 error = EISCONN;
135 goto release;
136 }
137
138 /* protect *sin6 from overwrites */
139 tmp = *sin6;
140 sin6 = &tmp;
141
142 faddr = &sin6->sin6_addr;
143 fport = sin6->sin6_port; /* allow 0 port */
144
145 /* KAME hack: embed scopeid */
146 if (in6_embedscope(&sin6->sin6_addr, sin6,
147 inp->inp_outputopts6, inp->inp_moptions6) != 0) {
148 error = EINVAL;
149 goto release;
150 }
151
152 error = in6_pcbselsrc(&laddr, sin6, inp, optp);
153 if (error)
154 goto release;
155
156 if (inp->inp_lport == 0){
157 error = in_pcbbind(inp, NULL, p);
158 if (error)
159 goto release;
160 }
161
162 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) &&
163 !IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, laddr)) {
164 valid.sin6_addr = *laddr;
165 valid.sin6_port = inp->inp_lport;
166 valid.sin6_scope_id = 0;
167 valid.sin6_family = AF_INET6;
168 valid.sin6_len = sizeof(valid);
169 error = in6_pcbaddrisavail(inp, &valid, 0, p);
170 if (error)
171 goto release;
172 }
173 } else {
174 if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) {
175 error = ENOTCONN;
176 goto release;
177 }
178 laddr = &inp->inp_laddr6;
179 faddr = &inp->inp_faddr6;
180 fport = inp->inp_fport;
181 }
182
183 hlen = sizeof(struct ip6_hdr);
184
185 /*
186 * Calculate data length and get a mbuf
187 * for UDP and IP6 headers.
188 */
189 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
190 if (m == NULL) {
191 error = ENOBUFS;
192 goto releaseopt;
193 }
194
195 /*
196 * Stuff checksum and output datagram.
197 */
198 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
199 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
200 udp6->uh_dport = fport;
201 if (plen <= 0xffff)
202 udp6->uh_ulen = htons((u_short)plen);
203 else
204 udp6->uh_ulen = 0;
205 udp6->uh_sum = 0;
206
207 ip6 = mtod(m, struct ip6_hdr *);
208 ip6->ip6_flow = inp->inp_flowinfo & IPV6_FLOWINFO_MASK;
209 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
210 ip6->ip6_vfc |= IPV6_VERSION;
211 #if 0 /* ip6_plen will be filled in ip6_output. */
212 ip6->ip6_plen = htons((u_short)plen);
213 #endif
214 ip6->ip6_nxt = IPPROTO_UDP;
215 ip6->ip6_hlim = in6_selecthlim(inp);
216 ip6->ip6_src = *laddr;
217 ip6->ip6_dst = *faddr;
218
219 m->m_pkthdr.csum_flags |= M_UDP_CSUM_OUT;
220
221 flags = 0;
222 if (inp->inp_flags & IN6P_MINMTU)
223 flags |= IPV6_MINMTU;
224
225 udpstat_inc(udps_opackets);
226
227 /* force routing table */
228 m->m_pkthdr.ph_rtableid = inp->inp_rtableid;
229
230 #if NPF > 0
231 if (inp->inp_socket->so_state & SS_ISCONNECTED)
232 pf_mbuf_link_inpcb(m, inp);
233 #endif
234
235 error = ip6_output(m, optp, &inp->inp_route,
236 flags, inp->inp_moptions6, &inp->inp_seclevel);
237 goto releaseopt;
238
239 release:
240 m_freem(m);
241
242 releaseopt:
243 if (control) {
244 ip6_clearpktopts(&opt, -1);
245 m_freem(control);
246 }
247 return (error);
248 }
249