1 /* $NetBSD: udp6_output.c,v 1.37.4.1 2010/07/16 19:12:53 riz Exp $ */
2 /* $KAME: udp6_output.c,v 1.43 2001/10/15 09:19:52 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 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
62 */
63
64 #include <sys/cdefs.h>
65 __KERNEL_RCSID(0, "$NetBSD: udp6_output.c,v 1.37.4.1 2010/07/16 19:12:53 riz Exp $");
66
67 #include "opt_inet.h"
68
69 #include <sys/param.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/errno.h>
76 #include <sys/stat.h>
77 #include <sys/systm.h>
78 #include <sys/proc.h>
79 #include <sys/syslog.h>
80 #include <sys/kauth.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/udp_private.h>
95 #include <netinet/ip6.h>
96 #include <netinet6/ip6_var.h>
97 #include <netinet6/in6_pcb.h>
98 #include <netinet6/udp6_var.h>
99 #include <netinet6/udp6_private.h>
100 #include <netinet/icmp6.h>
101 #include <netinet6/ip6protosw.h>
102 #include <netinet6/scope6_var.h>
103
104 #include "faith.h"
105
106 #include <net/net_osdep.h>
107
108 /*
109 * UDP protocol inplementation.
110 * Per RFC 768, August, 1980.
111 */
112
113 int
114 udp6_output(struct in6pcb *in6p, struct mbuf *m, struct mbuf *addr6,
115 struct mbuf *control, struct lwp *l)
116 {
117 struct rtentry *rt;
118 u_int32_t ulen = m->m_pkthdr.len;
119 u_int32_t plen = sizeof(struct udphdr) + ulen;
120 struct ip6_hdr *ip6;
121 struct udphdr *udp6;
122 struct in6_addr *laddr, *faddr;
123 struct in6_addr laddr_mapped; /* XXX ugly */
124 struct sockaddr_in6 *sin6 = NULL;
125 struct ifnet *oifp = NULL;
126 int scope_ambiguous = 0;
127 u_int16_t fport;
128 int error = 0;
129 struct ip6_pktopts *optp = NULL;
130 struct ip6_pktopts opt;
131 int priv;
132 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
133 #ifdef INET
134 struct ip *ip;
135 struct udpiphdr *ui;
136 int flags = 0;
137 #endif
138 struct sockaddr_in6 tmp;
139
140 priv = 0;
141 if (l && !kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER,
142 NULL))
143 priv = 1;
144
145 if (addr6) {
146 if (addr6->m_len != sizeof(*sin6)) {
147 error = EINVAL;
148 goto release;
149 }
150 sin6 = mtod(addr6, struct sockaddr_in6 *);
151 if (sin6->sin6_family != AF_INET6) {
152 error = EAFNOSUPPORT;
153 goto release;
154 }
155
156 /* protect *sin6 from overwrites */
157 tmp = *sin6;
158 sin6 = &tmp;
159
160 /*
161 * Application should provide a proper zone ID or the use of
162 * default zone IDs should be enabled. Unfortunately, some
163 * applications do not behave as it should, so we need a
164 * workaround. Even if an appropriate ID is not determined,
165 * we'll see if we can determine the outgoing interface. If we
166 * can, determine the zone ID based on the interface below.
167 */
168 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
169 scope_ambiguous = 1;
170 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
171 goto release;
172 }
173
174 if (control) {
175 if ((error = ip6_setpktopts(control, &opt,
176 in6p->in6p_outputopts, priv, IPPROTO_UDP)) != 0)
177 goto release;
178 optp = &opt;
179 } else
180 optp = in6p->in6p_outputopts;
181
182
183 if (sin6) {
184 faddr = &sin6->sin6_addr;
185
186 /*
187 * IPv4 version of udp_output calls in_pcbconnect in this case,
188 * which needs splnet and affects performance.
189 * Since we saw no essential reason for calling in_pcbconnect,
190 * we get rid of such kind of logic, and call in6_selectsrc
191 * and in6_pcbsetport in order to fill in the local address
192 * and the local port.
193 */
194 if (sin6->sin6_port == 0) {
195 error = EADDRNOTAVAIL;
196 goto release;
197 }
198
199 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
200 /* how about ::ffff:0.0.0.0 case? */
201 error = EISCONN;
202 goto release;
203 }
204
205
206 faddr = &sin6->sin6_addr;
207 fport = sin6->sin6_port; /* allow 0 port */
208
209 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
210 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY))
211 {
212 /*
213 * I believe we should explicitly discard the
214 * packet when mapped addresses are disabled,
215 * rather than send the packet as an IPv6 one.
216 * If we chose the latter approach, the packet
217 * might be sent out on the wire based on the
218 * default route, the situation which we'd
219 * probably want to avoid.
220 * (20010421 jinmei@kame.net)
221 */
222 error = EINVAL;
223 goto release;
224 }
225 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)
226 && !IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) {
227 /*
228 * when remote addr is an IPv4-mapped address,
229 * local addr should not be an IPv6 address,
230 * since you cannot determine how to map IPv6
231 * source address to IPv4.
232 */
233 error = EINVAL;
234 goto release;
235 }
236
237 af = AF_INET;
238 }
239
240 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
241 laddr = in6_selectsrc(sin6, optp,
242 in6p->in6p_moptions,
243 &in6p->in6p_route,
244 &in6p->in6p_laddr, &oifp, &error);
245 if (oifp && scope_ambiguous &&
246 (error = in6_setscope(&sin6->sin6_addr,
247 oifp, NULL))) {
248 goto release;
249 }
250 } else {
251 /*
252 * XXX: freebsd[34] does not have in_selectsrc, but
253 * we can omit the whole part because freebsd4 calls
254 * udp_output() directly in this case, and thus we'll
255 * never see this path.
256 */
257 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
258 struct sockaddr_in *sinp, sin_dst;
259 struct in_addr ina;
260
261 memcpy(&ina, &faddr->s6_addr[12], sizeof(ina));
262 sockaddr_in_init(&sin_dst, &ina, 0);
263 sinp = in_selectsrc(&sin_dst, &in6p->in6p_route,
264 in6p->in6p_socket->so_options, NULL,
265 &error);
266 if (sinp == NULL) {
267 if (error == 0)
268 error = EADDRNOTAVAIL;
269 goto release;
270 }
271 memset(&laddr_mapped, 0, sizeof(laddr_mapped));
272 laddr_mapped.s6_addr16[5] = 0xffff; /* ugly */
273 memcpy(&laddr_mapped.s6_addr[12],
274 &sinp->sin_addr,
275 sizeof(sinp->sin_addr));
276 laddr = &laddr_mapped;
277 } else
278 {
279 laddr = &in6p->in6p_laddr; /* XXX */
280 }
281 }
282 if (laddr == NULL) {
283 if (error == 0)
284 error = EADDRNOTAVAIL;
285 goto release;
286 }
287 if (in6p->in6p_lport == 0 &&
288 (error = in6_pcbsetport(laddr, in6p, l)) != 0)
289 goto release;
290 } else {
291 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
292 error = ENOTCONN;
293 goto release;
294 }
295 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
296 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY))
297 {
298 /*
299 * XXX: this case would happen when the
300 * application sets the V6ONLY flag after
301 * connecting the foreign address.
302 * Such applications should be fixed,
303 * so we bark here.
304 */
305 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
306 "option was set for a connected socket\n");
307 error = EINVAL;
308 goto release;
309 } else
310 af = AF_INET;
311 }
312 laddr = &in6p->in6p_laddr;
313 faddr = &in6p->in6p_faddr;
314 fport = in6p->in6p_fport;
315 }
316
317 if (af == AF_INET)
318 hlen = sizeof(struct ip);
319
320 /*
321 * Calculate data length and get a mbuf
322 * for UDP and IP6 headers.
323 */
324 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
325 if (m == 0) {
326 error = ENOBUFS;
327 goto release;
328 }
329
330 /*
331 * Stuff checksum and output datagram.
332 */
333 udp6 = (struct udphdr *)(mtod(m, char *) + hlen);
334 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
335 udp6->uh_dport = fport;
336 if (plen <= 0xffff)
337 udp6->uh_ulen = htons((u_int16_t)plen);
338 else
339 udp6->uh_ulen = 0;
340 udp6->uh_sum = 0;
341
342 switch (af) {
343 case AF_INET6:
344 ip6 = mtod(m, struct ip6_hdr *);
345 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
346 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
347 ip6->ip6_vfc |= IPV6_VERSION;
348 #if 0 /* ip6_plen will be filled in ip6_output. */
349 ip6->ip6_plen = htons((u_int16_t)plen);
350 #endif
351 ip6->ip6_nxt = IPPROTO_UDP;
352 ip6->ip6_hlim = in6_selecthlim(in6p,
353 (rt = rtcache_validate(&in6p->in6p_route)) != NULL
354 ? rt->rt_ifp : NULL);
355 ip6->ip6_src = *laddr;
356 ip6->ip6_dst = *faddr;
357
358 udp6->uh_sum = in6_cksum_phdr(laddr, faddr,
359 htonl(plen), htonl(IPPROTO_UDP));
360 m->m_pkthdr.csum_flags = M_CSUM_UDPv6;
361 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
362
363 UDP6_STATINC(UDP6_STAT_OPACKETS);
364 error = ip6_output(m, optp, &in6p->in6p_route, 0,
365 in6p->in6p_moptions, in6p->in6p_socket, NULL);
366 break;
367 case AF_INET:
368 #ifdef INET
369 /* can't transmit jumbogram over IPv4 */
370 if (plen > 0xffff) {
371 error = EMSGSIZE;
372 goto release;
373 }
374
375 ip = mtod(m, struct ip *);
376 ui = (struct udpiphdr *)ip;
377 memset(ui->ui_x1, 0, sizeof(ui->ui_x1));
378 ui->ui_pr = IPPROTO_UDP;
379 ui->ui_len = htons(plen);
380 memcpy(&ui->ui_src, &laddr->s6_addr[12], sizeof(ui->ui_src));
381 ui->ui_ulen = ui->ui_len;
382
383 flags = (in6p->in6p_socket->so_options &
384 (SO_DONTROUTE | SO_BROADCAST));
385 memcpy(&ui->ui_dst, &faddr->s6_addr[12], sizeof(ui->ui_dst));
386
387 udp6->uh_sum = in_cksum(m, hlen + plen);
388 if (udp6->uh_sum == 0)
389 udp6->uh_sum = 0xffff;
390
391 ip->ip_len = htons(hlen + plen);
392 ip->ip_ttl = in6_selecthlim(in6p, NULL); /* XXX */
393 ip->ip_tos = 0; /* XXX */
394
395 UDP_STATINC(UDP_STAT_OPACKETS);
396 error = ip_output(m, NULL, &in6p->in6p_route, flags /* XXX */,
397 (struct ip_moptions *)NULL,
398 (struct socket *)in6p->in6p_socket);
399 break;
400 #else
401 error = EAFNOSUPPORT;
402 goto release;
403 #endif
404 }
405 goto releaseopt;
406
407 release:
408 m_freem(m);
409
410 releaseopt:
411 if (control) {
412 if (optp == &opt)
413 ip6_clearpktopts(&opt, -1);
414 m_freem(control);
415 }
416 return (error);
417 }
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