1 /* $FreeBSD: releng/5.4/sys/netinet6/udp6_output.c 141090 2005-01-31 23:27:04Z imp $ */
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 * 4. 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 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
62 */
63
64 #include "opt_ipsec.h"
65 #include "opt_inet.h"
66 #include "opt_inet6.h"
67
68 #include <sys/param.h>
69 #include <sys/proc.h>
70 #include <sys/malloc.h>
71 #include <sys/mbuf.h>
72 #include <sys/protosw.h>
73 #include <sys/socket.h>
74 #include <sys/socketvar.h>
75 #include <sys/sysctl.h>
76 #include <sys/errno.h>
77 #include <sys/stat.h>
78 #include <sys/systm.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 #endif /* IPSEC */
106
107 #include <net/net_osdep.h>
108
109 /*
110 * UDP protocol inplementation.
111 * Per RFC 768, August, 1980.
112 */
113
114 #define in6pcb inpcb
115 #define udp6stat udpstat
116 #define udp6s_opackets udps_opackets
117
118 int
119 udp6_output(in6p, m, addr6, control, td)
120 struct in6pcb *in6p;
121 struct mbuf *m;
122 struct mbuf *control;
123 struct sockaddr *addr6;
124 struct thread *td;
125 {
126 u_int32_t ulen = m->m_pkthdr.len;
127 u_int32_t plen = sizeof(struct udphdr) + ulen;
128 struct ip6_hdr *ip6;
129 struct udphdr *udp6;
130 struct in6_addr *laddr, *faddr;
131 u_short fport;
132 int error = 0;
133 struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
134 int priv;
135 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
136 int flags;
137 struct sockaddr_in6 tmp;
138
139 priv = 0;
140 if (td && !suser(td))
141 priv = 1;
142 if (control) {
143 if ((error = ip6_setpktoptions(control, &opt, stickyopt, priv,
144 0, IPPROTO_UDP)) != 0)
145 goto release;
146 in6p->in6p_outputopts = &opt;
147 }
148
149 if (addr6) {
150 /*
151 * IPv4 version of udp_output calls in_pcbconnect in this case,
152 * which needs splnet and affects performance.
153 * Since we saw no essential reason for calling in_pcbconnect,
154 * we get rid of such kind of logic, and call in6_selectsrc
155 * and in6_pcbsetport in order to fill in the local address
156 * and the local port.
157 */
158 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
159 if (sin6->sin6_port == 0) {
160 error = EADDRNOTAVAIL;
161 goto release;
162 }
163
164 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
165 /* how about ::ffff:0.0.0.0 case? */
166 error = EISCONN;
167 goto release;
168 }
169
170 /* protect *sin6 from overwrites */
171 tmp = *sin6;
172 sin6 = &tmp;
173
174 faddr = &sin6->sin6_addr;
175 fport = sin6->sin6_port; /* allow 0 port */
176
177 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
178 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
179 /*
180 * I believe we should explicitly discard the
181 * packet when mapped addresses are disabled,
182 * rather than send the packet as an IPv6 one.
183 * If we chose the latter approach, the packet
184 * might be sent out on the wire based on the
185 * default route, the situation which we'd
186 * probably want to avoid.
187 * (20010421 jinmei@kame.net)
188 */
189 error = EINVAL;
190 goto release;
191 } else
192 af = AF_INET;
193 }
194
195 /* KAME hack: embed scopeid */
196 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
197 error = EINVAL;
198 goto release;
199 }
200
201 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
202 laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
203 in6p->in6p_moptions, NULL,
204 &in6p->in6p_laddr, &error);
205 } else
206 laddr = &in6p->in6p_laddr; /* XXX */
207 if (laddr == NULL) {
208 if (error == 0)
209 error = EADDRNOTAVAIL;
210 goto release;
211 }
212 if (in6p->in6p_lport == 0 &&
213 (error = in6_pcbsetport(laddr, in6p, td->td_ucred)) != 0)
214 goto release;
215 } else {
216 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
217 error = ENOTCONN;
218 goto release;
219 }
220 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
221 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
222 /*
223 * XXX: this case would happen when the
224 * application sets the V6ONLY flag after
225 * connecting the foreign address.
226 * Such applications should be fixed,
227 * so we bark here.
228 */
229 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
230 "option was set for a connected socket\n");
231 error = EINVAL;
232 goto release;
233 } else
234 af = AF_INET;
235 }
236 laddr = &in6p->in6p_laddr;
237 faddr = &in6p->in6p_faddr;
238 fport = in6p->in6p_fport;
239 }
240
241 if (af == AF_INET)
242 hlen = sizeof(struct ip);
243
244 /*
245 * Calculate data length and get a mbuf
246 * for UDP and IP6 headers.
247 */
248 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
249 if (m == 0) {
250 error = ENOBUFS;
251 goto release;
252 }
253
254 /*
255 * Stuff checksum and output datagram.
256 */
257 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
258 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
259 udp6->uh_dport = fport;
260 if (plen <= 0xffff)
261 udp6->uh_ulen = htons((u_short)plen);
262 else
263 udp6->uh_ulen = 0;
264 udp6->uh_sum = 0;
265
266 switch (af) {
267 case AF_INET6:
268 ip6 = mtod(m, struct ip6_hdr *);
269 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
270 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
271 ip6->ip6_vfc |= IPV6_VERSION;
272 #if 0 /* ip6_plen will be filled in ip6_output. */
273 ip6->ip6_plen = htons((u_short)plen);
274 #endif
275 ip6->ip6_nxt = IPPROTO_UDP;
276 ip6->ip6_hlim = in6_selecthlim(in6p, NULL);
277 ip6->ip6_src = *laddr;
278 ip6->ip6_dst = *faddr;
279
280 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
281 sizeof(struct ip6_hdr), plen)) == 0) {
282 udp6->uh_sum = 0xffff;
283 }
284
285 flags = 0;
286
287 udp6stat.udp6s_opackets++;
288 error = ip6_output(m, in6p->in6p_outputopts, NULL,
289 flags, in6p->in6p_moptions, NULL, in6p);
290 break;
291 case AF_INET:
292 error = EAFNOSUPPORT;
293 goto release;
294 }
295 goto releaseopt;
296
297 release:
298 m_freem(m);
299
300 releaseopt:
301 if (control) {
302 ip6_clearpktopts(in6p->in6p_outputopts, -1);
303 in6p->in6p_outputopts = stickyopt;
304 m_freem(control);
305 }
306 return (error);
307 }
Cache object: e8cca56750d0e4f1a8e22726023318df
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