1 /* $FreeBSD$ */
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 * 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 "opt_ipsec.h"
69 #include "opt_inet.h"
70 #include "opt_inet6.h"
71
72 #include <sys/param.h>
73 #include <sys/malloc.h>
74 #include <sys/mbuf.h>
75 #include <sys/protosw.h>
76 #include <sys/socket.h>
77 #include <sys/socketvar.h>
78 #include <sys/sysctl.h>
79 #include <sys/errno.h>
80 #include <sys/stat.h>
81 #include <sys/systm.h>
82 #include <sys/proc.h>
83 #include <sys/syslog.h>
84
85 #include <net/if.h>
86 #include <net/route.h>
87 #include <net/if_types.h>
88
89 #include <netinet/in.h>
90 #include <netinet/in_var.h>
91 #include <netinet/in_systm.h>
92 #include <netinet/ip.h>
93 #include <netinet/ip_var.h>
94 #include <netinet/in_pcb.h>
95 #include <netinet/udp.h>
96 #include <netinet/udp_var.h>
97 #include <netinet/ip6.h>
98 #include <netinet6/ip6_var.h>
99 #include <netinet6/in6_pcb.h>
100 #include <netinet6/udp6_var.h>
101 #include <netinet/icmp6.h>
102 #include <netinet6/ip6protosw.h>
103
104 #ifdef IPSEC
105 #include <netinet6/ipsec.h>
106 #ifdef INET6
107 #include <netinet6/ipsec6.h>
108 #endif
109 #endif /* IPSEC */
110
111 #include <net/net_osdep.h>
112
113 /*
114 * UDP protocol inplementation.
115 * Per RFC 768, August, 1980.
116 */
117
118 #define in6pcb inpcb
119 #define udp6stat udpstat
120 #define udp6s_opackets udps_opackets
121
122 int
123 udp6_output(in6p, m, addr6, control, p)
124 struct in6pcb *in6p;
125 struct mbuf *m;
126 struct mbuf *control;
127 struct sockaddr *addr6;
128 struct proc *p;
129 {
130 u_int32_t ulen = m->m_pkthdr.len;
131 u_int32_t plen = sizeof(struct udphdr) + ulen;
132 struct ip6_hdr *ip6;
133 struct udphdr *udp6;
134 struct in6_addr *laddr, *faddr;
135 u_short fport;
136 int error = 0;
137 struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
138 int priv;
139 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
140 int flags;
141 struct sockaddr_in6 tmp;
142
143 priv = 0;
144 if (p && !suser(p))
145 priv = 1;
146 if (control) {
147 if ((error = ip6_setpktoptions(control, &opt, priv, 0)) != 0)
148 goto release;
149 in6p->in6p_outputopts = &opt;
150 }
151
152 if (addr6) {
153 /*
154 * IPv4 version of udp_output calls in_pcbconnect in this case,
155 * which needs splnet and affects performance.
156 * Since we saw no essential reason for calling in_pcbconnect,
157 * we get rid of such kind of logic, and call in6_selectsrc
158 * and in6_pcbsetport in order to fill in the local address
159 * and the local port.
160 */
161 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
162 if (sin6->sin6_port == 0) {
163 error = EADDRNOTAVAIL;
164 goto release;
165 }
166
167 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
168 /* how about ::ffff:0.0.0.0 case? */
169 error = EISCONN;
170 goto release;
171 }
172
173 /* protect *sin6 from overwrites */
174 tmp = *sin6;
175 sin6 = &tmp;
176
177 faddr = &sin6->sin6_addr;
178 fport = sin6->sin6_port; /* allow 0 port */
179
180 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
181 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
182 /*
183 * I believe we should explicitly discard the
184 * packet when mapped addresses are disabled,
185 * rather than send the packet as an IPv6 one.
186 * If we chose the latter approach, the packet
187 * might be sent out on the wire based on the
188 * default route, the situation which we'd
189 * probably want to avoid.
190 * (20010421 jinmei@kame.net)
191 */
192 error = EINVAL;
193 goto release;
194 } else
195 af = AF_INET;
196 }
197
198 /* KAME hack: embed scopeid */
199 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
200 error = EINVAL;
201 goto release;
202 }
203
204 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
205 laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
206 in6p->in6p_moptions,
207 &in6p->in6p_route,
208 &in6p->in6p_laddr, &error);
209 } else
210 laddr = &in6p->in6p_laddr; /* XXX */
211 if (laddr == NULL) {
212 if (error == 0)
213 error = EADDRNOTAVAIL;
214 goto release;
215 }
216 if (in6p->in6p_lport == 0 &&
217 (error = in6_pcbsetport(laddr, in6p, p)) != 0)
218 goto release;
219 } else {
220 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
221 error = ENOTCONN;
222 goto release;
223 }
224 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
225 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
226 /*
227 * XXX: this case would happen when the
228 * application sets the V6ONLY flag after
229 * connecting the foreign address.
230 * Such applications should be fixed,
231 * so we bark here.
232 */
233 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
234 "option was set for a connected socket\n");
235 error = EINVAL;
236 goto release;
237 } else
238 af = AF_INET;
239 }
240 laddr = &in6p->in6p_laddr;
241 faddr = &in6p->in6p_faddr;
242 fport = in6p->in6p_fport;
243 }
244
245 if (af == AF_INET)
246 hlen = sizeof(struct ip);
247
248 /*
249 * Calculate data length and get a mbuf
250 * for UDP and IP6 headers.
251 */
252 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
253 if (m == 0) {
254 error = ENOBUFS;
255 goto release;
256 }
257
258 /*
259 * Stuff checksum and output datagram.
260 */
261 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
262 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
263 udp6->uh_dport = fport;
264 if (plen <= 0xffff)
265 udp6->uh_ulen = htons((u_short)plen);
266 else
267 udp6->uh_ulen = 0;
268 udp6->uh_sum = 0;
269
270 switch (af) {
271 case AF_INET6:
272 ip6 = mtod(m, struct ip6_hdr *);
273 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
274 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
275 ip6->ip6_vfc |= IPV6_VERSION;
276 #if 0 /* ip6_plen will be filled in ip6_output. */
277 ip6->ip6_plen = htons((u_short)plen);
278 #endif
279 ip6->ip6_nxt = IPPROTO_UDP;
280 ip6->ip6_hlim = in6_selecthlim(in6p,
281 in6p->in6p_route.ro_rt ?
282 in6p->in6p_route.ro_rt->rt_ifp : NULL);
283 ip6->ip6_src = *laddr;
284 ip6->ip6_dst = *faddr;
285
286 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
287 sizeof(struct ip6_hdr), plen)) == 0) {
288 udp6->uh_sum = 0xffff;
289 }
290
291 flags = 0;
292
293 udp6stat.udp6s_opackets++;
294 error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
295 flags, in6p->in6p_moptions, NULL, in6p);
296 break;
297 case AF_INET:
298 error = EAFNOSUPPORT;
299 goto release;
300 }
301 goto releaseopt;
302
303 release:
304 m_freem(m);
305
306 releaseopt:
307 if (control) {
308 ip6_clearpktopts(in6p->in6p_outputopts, 0, -1);
309 in6p->in6p_outputopts = stickyopt;
310 m_freem(control);
311 }
312 return(error);
313 }
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