1 /* $FreeBSD: src/sys/netinet6/udp6_output.c,v 1.1.2.6 2003/01/23 21:06:47 sam Exp $ */
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. 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_inet.h"
65 #include "opt_inet6.h"
66
67 #include <sys/param.h>
68 #include <sys/malloc.h>
69 #include <sys/mbuf.h>
70 #include <sys/protosw.h>
71 #include <sys/socket.h>
72 #include <sys/socketvar.h>
73 #include <sys/sysctl.h>
74 #include <sys/errno.h>
75 #include <sys/stat.h>
76 #include <sys/systm.h>
77 #include <sys/proc.h>
78 #include <sys/caps.h>
79 #include <sys/syslog.h>
80 #include <sys/jail.h>
81
82 #include <net/if.h>
83 #include <net/route.h>
84 #include <net/if_types.h>
85
86 #include <netinet/in.h>
87 #include <netinet/in_var.h>
88 #include <netinet/in_systm.h>
89 #include <netinet/ip.h>
90 #include <netinet/ip_var.h>
91 #include <netinet/in_pcb.h>
92 #include <netinet/udp.h>
93 #include <netinet/udp_var.h>
94 #include <netinet/ip6.h>
95 #include <netinet6/ip6_var.h>
96 #include <netinet6/in6_pcb.h>
97 #include <netinet6/udp6_var.h>
98 #include <netinet/icmp6.h>
99 #include <netinet6/ip6protosw.h>
100
101 #include <net/net_osdep.h>
102
103 /*
104 * UDP protocol inplementation.
105 * Per RFC 768, August, 1980.
106 */
107
108 #define in6pcb inpcb
109 #define udp6stat udp_stat
110 #define udp6s_opackets udps_opackets
111
112 int
udp6_output(struct in6pcb * in6p,struct mbuf * m,struct sockaddr * addr6,struct mbuf * control,struct thread * td)113 udp6_output(struct in6pcb *in6p, struct mbuf *m, struct sockaddr *addr6,
114 struct mbuf *control, struct thread *td)
115 {
116 u_int32_t ulen = m->m_pkthdr.len;
117 u_int32_t plen = sizeof(struct udphdr) + ulen;
118 struct ip6_hdr *ip6;
119 struct udphdr *udp6;
120 struct in6_addr *laddr, *faddr;
121 u_short fport;
122 int error = 0;
123 struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
124 int priv;
125 int hlen = sizeof(struct ip6_hdr);
126 struct sockaddr_in6 tmp;
127
128 /*
129 * 1 if privileged, 0 if not
130 */
131 priv = !caps_priv_check_td(td, SYSCAP_RESTRICTEDROOT);
132
133 if (control) {
134 if ((error = ip6_setpktoptions(control, &opt,
135 in6p->in6p_outputopts,
136 IPPROTO_UDP, priv)) != 0)
137 goto release;
138 in6p->in6p_outputopts = &opt;
139 }
140
141 if (addr6) {
142 /*
143 * IPv4 version of udp_output calls in_pcbconnect in this case,
144 * which needs splnet and affects performance.
145 * Since we saw no essential reason for calling in_pcbconnect,
146 * we get rid of such kind of logic, and call in6_selectsrc
147 * and in6_pcbsetlport in order to fill in the local address
148 * and the local port.
149 */
150 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
151
152 /* Caller should have rejected the v4-mapped address */
153 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr),
154 ("v4-mapped address"));
155
156 if (sin6->sin6_port == 0) {
157 error = EADDRNOTAVAIL;
158 goto release;
159 }
160
161 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
162 /* how about ::ffff:0.0.0.0 case? */
163 error = EISCONN;
164 goto release;
165 }
166 if (!prison_remote_ip(td, addr6)) {
167 error = EAFNOSUPPORT; /* IPv4 only jail */
168 goto release;
169 }
170
171 /* protect *sin6 from overwrites */
172 tmp = *sin6;
173 sin6 = &tmp;
174
175 faddr = &sin6->sin6_addr;
176 fport = sin6->sin6_port; /* allow 0 port */
177
178 /* KAME hack: embed scopeid */
179 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
180 error = EINVAL;
181 goto release;
182 }
183
184 laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
185 in6p->in6p_moptions,
186 &in6p->in6p_route,
187 &in6p->in6p_laddr, &error, NULL);
188 if (laddr == NULL) {
189 if (error == 0)
190 error = EADDRNOTAVAIL;
191 goto release;
192 }
193 if (in6p->in6p_lport == 0) {
194 if ((error = in6_pcbsetlport(laddr, in6p, td)) != 0)
195 goto release;
196 in_pcbinswildcardhash(in6p);
197 }
198 } else {
199 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
200 error = ENOTCONN;
201 goto release;
202 }
203
204 /* Connection to v4-mapped address should have been rejected */
205 KASSERT(!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr),
206 ("bound to v4-mapped address"));
207
208 laddr = &in6p->in6p_laddr;
209 faddr = &in6p->in6p_faddr;
210 fport = in6p->in6p_fport;
211 }
212
213 /*
214 * Calculate data length and get a mbuf
215 * for UDP and IP6 headers.
216 */
217 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
218 if (m == NULL) {
219 error = ENOBUFS;
220 goto release;
221 }
222
223 /*
224 * Stuff checksum and output datagram.
225 */
226 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
227 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
228 udp6->uh_dport = fport;
229 if (plen <= 0xffff)
230 udp6->uh_ulen = htons((u_short)plen);
231 else
232 udp6->uh_ulen = 0;
233 udp6->uh_sum = 0;
234
235 ip6 = mtod(m, struct ip6_hdr *);
236 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
237 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
238 ip6->ip6_vfc |= IPV6_VERSION;
239 #if 0 /* ip6_plen will be filled in ip6_output. */
240 ip6->ip6_plen = htons((u_short)plen);
241 #endif
242 ip6->ip6_nxt = IPPROTO_UDP;
243 ip6->ip6_hlim = in6_selecthlim(in6p,
244 in6p->in6p_route.ro_rt ?
245 in6p->in6p_route.ro_rt->rt_ifp : NULL);
246 ip6->ip6_src = *laddr;
247 ip6->ip6_dst = *faddr;
248
249 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
250 sizeof(struct ip6_hdr), plen)) == 0) {
251 udp6->uh_sum = 0xffff;
252 }
253
254 udp6stat.udp6s_opackets++;
255 error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route, 0,
256 in6p->in6p_moptions, NULL, in6p);
257 goto releaseopt;
258
259 release:
260 m_freem(m);
261
262 releaseopt:
263 if (control) {
264 ip6_clearpktopts(in6p->in6p_outputopts, -1);
265 in6p->in6p_outputopts = stickyopt;
266 m_freem(control);
267 }
268 return (error);
269 }
270