1 /* $NetBSD: udp6_usrreq.c,v 1.86 2008/05/04 07:22:15 thorpej Exp $ */
2 /* $KAME: udp6_usrreq.c,v 1.86 2001/05/27 17:33:00 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_usrreq.c,v 1.86 2008/05/04 07:22:15 thorpej Exp $");
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/errno.h>
74 #include <sys/stat.h>
75 #include <sys/systm.h>
76 #include <sys/proc.h>
77 #include <sys/syslog.h>
78 #include <sys/sysctl.h>
79
80 #include <net/if.h>
81 #include <net/route.h>
82 #include <net/if_types.h>
83
84 #include <netinet/in.h>
85 #include <netinet/in_var.h>
86 #include <netinet/in_systm.h>
87 #include <netinet/ip.h>
88 #include <netinet/ip_var.h>
89 #include <netinet/in_pcb.h>
90 #include <netinet/udp.h>
91 #include <netinet/udp_var.h>
92 #include <netinet/ip6.h>
93 #include <netinet6/ip6_var.h>
94 #include <netinet6/in6_pcb.h>
95 #include <netinet/icmp6.h>
96 #include <netinet6/udp6_var.h>
97 #include <netinet6/udp6_private.h>
98 #include <netinet6/ip6protosw.h>
99 #include <netinet/in_offload.h>
100
101 #include "faith.h"
102 #if defined(NFAITH) && NFAITH > 0
103 #include <net/if_faith.h>
104 #endif
105
106 /*
107 * UDP protocol implementation.
108 * Per RFC 768, August, 1980.
109 */
110
111 extern struct inpcbtable udbtable;
112
113 percpu_t *udp6stat_percpu;
114
115 static void udp6_notify(struct in6pcb *, int);
116
117 void
118 udp6_init(void)
119 {
120 /* initialization done in udp_init() due to initialization order */
121 }
122
123 /*
124 * Notify a udp user of an asynchronous error;
125 * just wake up so that he can collect error status.
126 */
127 static void
128 udp6_notify(struct in6pcb *in6p, int errno)
129 {
130 in6p->in6p_socket->so_error = errno;
131 sorwakeup(in6p->in6p_socket);
132 sowwakeup(in6p->in6p_socket);
133 }
134
135 void *
136 udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d)
137 {
138 struct udphdr uh;
139 struct ip6_hdr *ip6;
140 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa;
141 struct mbuf *m;
142 int off;
143 void *cmdarg;
144 struct ip6ctlparam *ip6cp = NULL;
145 const struct sockaddr_in6 *sa6_src = NULL;
146 void (*notify)(struct in6pcb *, int) = udp6_notify;
147 struct udp_portonly {
148 u_int16_t uh_sport;
149 u_int16_t uh_dport;
150 } *uhp;
151
152 if (sa->sa_family != AF_INET6 ||
153 sa->sa_len != sizeof(struct sockaddr_in6))
154 return NULL;
155
156 if ((unsigned)cmd >= PRC_NCMDS)
157 return NULL;
158 if (PRC_IS_REDIRECT(cmd))
159 notify = in6_rtchange, d = NULL;
160 else if (cmd == PRC_HOSTDEAD)
161 d = NULL;
162 else if (cmd == PRC_MSGSIZE) {
163 /* special code is present, see below */
164 notify = in6_rtchange;
165 }
166 else if (inet6ctlerrmap[cmd] == 0)
167 return NULL;
168
169 /* if the parameter is from icmp6, decode it. */
170 if (d != NULL) {
171 ip6cp = (struct ip6ctlparam *)d;
172 m = ip6cp->ip6c_m;
173 ip6 = ip6cp->ip6c_ip6;
174 off = ip6cp->ip6c_off;
175 cmdarg = ip6cp->ip6c_cmdarg;
176 sa6_src = ip6cp->ip6c_src;
177 } else {
178 m = NULL;
179 ip6 = NULL;
180 cmdarg = NULL;
181 sa6_src = &sa6_any;
182 off = 0;
183 }
184
185 if (ip6) {
186 /*
187 * XXX: We assume that when IPV6 is non NULL,
188 * M and OFF are valid.
189 */
190
191 /* check if we can safely examine src and dst ports */
192 if (m->m_pkthdr.len < off + sizeof(*uhp)) {
193 if (cmd == PRC_MSGSIZE)
194 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0);
195 return NULL;
196 }
197
198 bzero(&uh, sizeof(uh));
199 m_copydata(m, off, sizeof(*uhp), (void *)&uh);
200
201 if (cmd == PRC_MSGSIZE) {
202 int valid = 0;
203
204 /*
205 * Check to see if we have a valid UDP socket
206 * corresponding to the address in the ICMPv6 message
207 * payload.
208 */
209 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr,
210 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr,
211 uh.uh_sport, 0))
212 valid++;
213 #if 0
214 /*
215 * As the use of sendto(2) is fairly popular,
216 * we may want to allow non-connected pcb too.
217 * But it could be too weak against attacks...
218 * We should at least check if the local address (= s)
219 * is really ours.
220 */
221 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr,
222 uh.uh_dport, 0))
223 valid++;
224 #endif
225
226 /*
227 * Depending on the value of "valid" and routing table
228 * size (mtudisc_{hi,lo}wat), we will:
229 * - recalculate the new MTU and create the
230 * corresponding routing entry, or
231 * - ignore the MTU change notification.
232 */
233 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
234
235 /*
236 * regardless of if we called
237 * icmp6_mtudisc_update(), we need to call
238 * in6_pcbnotify(), to notify path MTU change
239 * to the userland (RFC3542), because some
240 * unconnected sockets may share the same
241 * destination and want to know the path MTU.
242 */
243 }
244
245 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport,
246 (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg,
247 notify);
248 } else {
249 (void) in6_pcbnotify(&udbtable, sa, 0,
250 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
251 }
252 return NULL;
253 }
254
255 extern int udp6_sendspace;
256 extern int udp6_recvspace;
257
258 int
259 udp6_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr6,
260 struct mbuf *control, struct lwp *l)
261 {
262 struct in6pcb *in6p = sotoin6pcb(so);
263 int error = 0;
264 int s;
265
266 /*
267 * MAPPED_ADDR implementation info:
268 * Mapped addr support for PRU_CONTROL is not necessary.
269 * Because typical user of PRU_CONTROL is such as ifconfig,
270 * and they don't associate any addr to their socket. Then
271 * socket family is only hint about the PRU_CONTROL'ed address
272 * family, especially when getting addrs from kernel.
273 * So AF_INET socket need to be used to control AF_INET addrs,
274 * and AF_INET6 socket for AF_INET6 addrs.
275 */
276 if (req == PRU_CONTROL)
277 return in6_control(so, (u_long)m, (void *)addr6,
278 (struct ifnet *)control, l);
279
280 if (req == PRU_PURGEIF) {
281 mutex_enter(softnet_lock);
282 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control);
283 in6_purgeif((struct ifnet *)control);
284 in6_pcbpurgeif(&udbtable, (struct ifnet *)control);
285 mutex_exit(softnet_lock);
286 return 0;
287 }
288
289 if (req == PRU_ATTACH)
290 sosetlock(so);
291 else if (in6p == NULL) {
292 error = EINVAL;
293 goto release;
294 }
295
296 switch (req) {
297 case PRU_ATTACH:
298 /*
299 * MAPPED_ADDR implementation spec:
300 * Always attach for IPv6,
301 * and only when necessary for IPv4.
302 */
303 if (in6p != NULL) {
304 error = EINVAL;
305 break;
306 }
307 s = splsoftnet();
308 error = in6_pcballoc(so, &udbtable);
309 splx(s);
310 if (error)
311 break;
312 error = soreserve(so, udp6_sendspace, udp6_recvspace);
313 if (error)
314 break;
315 in6p = sotoin6pcb(so);
316 in6p->in6p_cksum = -1; /* just to be sure */
317 break;
318
319 case PRU_DETACH:
320 in6_pcbdetach(in6p);
321 break;
322
323 case PRU_BIND:
324 s = splsoftnet();
325 error = in6_pcbbind(in6p, addr6, l);
326 splx(s);
327 break;
328
329 case PRU_CONNECT:
330 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
331 error = EISCONN;
332 break;
333 }
334 s = splsoftnet();
335 error = in6_pcbconnect(in6p, addr6, l);
336 splx(s);
337 if (error == 0)
338 soisconnected(so);
339 break;
340
341 case PRU_DISCONNECT:
342 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
343 error = ENOTCONN;
344 break;
345 }
346 s = splsoftnet();
347 in6_pcbdisconnect(in6p);
348 bzero((void *)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr));
349 splx(s);
350 so->so_state &= ~SS_ISCONNECTED; /* XXX */
351 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */
352 break;
353
354 case PRU_SHUTDOWN:
355 socantsendmore(so);
356 break;
357
358 case PRU_SEND:
359 s = splsoftnet();
360 error = udp6_output(in6p, m, addr6, control, l);
361 splx(s);
362 return error;
363
364 case PRU_ABORT:
365 soisdisconnected(so);
366 in6_pcbdetach(in6p);
367 break;
368
369 case PRU_SOCKADDR:
370 in6_setsockaddr(in6p, addr6);
371 break;
372
373 case PRU_PEERADDR:
374 in6_setpeeraddr(in6p, addr6);
375 break;
376
377 case PRU_SENSE:
378 /*
379 * stat: don't bother with a blocksize
380 */
381 return 0;
382
383 case PRU_LISTEN:
384 case PRU_CONNECT2:
385 case PRU_ACCEPT:
386 case PRU_SENDOOB:
387 case PRU_FASTTIMO:
388 case PRU_SLOWTIMO:
389 case PRU_PROTORCV:
390 case PRU_PROTOSEND:
391 error = EOPNOTSUPP;
392 break;
393
394 case PRU_RCVD:
395 case PRU_RCVOOB:
396 return EOPNOTSUPP; /* do not free mbuf's */
397
398 default:
399 panic("udp6_usrreq");
400 }
401
402 release:
403 if (control != NULL)
404 m_freem(control);
405 if (m != NULL)
406 m_freem(m);
407 return error;
408 }
409
410 static int
411 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS)
412 {
413
414 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS));
415 }
416
417 SYSCTL_SETUP(sysctl_net_inet6_udp6_setup, "sysctl net.inet6.udp6 subtree setup")
418 {
419 sysctl_createv(clog, 0, NULL, NULL,
420 CTLFLAG_PERMANENT,
421 CTLTYPE_NODE, "net", NULL,
422 NULL, 0, NULL, 0,
423 CTL_NET, CTL_EOL);
424 sysctl_createv(clog, 0, NULL, NULL,
425 CTLFLAG_PERMANENT,
426 CTLTYPE_NODE, "inet6", NULL,
427 NULL, 0, NULL, 0,
428 CTL_NET, PF_INET6, CTL_EOL);
429 sysctl_createv(clog, 0, NULL, NULL,
430 CTLFLAG_PERMANENT,
431 CTLTYPE_NODE, "udp6",
432 SYSCTL_DESCR("UDPv6 related settings"),
433 NULL, 0, NULL, 0,
434 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL);
435
436 sysctl_createv(clog, 0, NULL, NULL,
437 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
438 CTLTYPE_INT, "sendspace",
439 SYSCTL_DESCR("Default UDP send buffer size"),
440 NULL, 0, &udp6_sendspace, 0,
441 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE,
442 CTL_EOL);
443 sysctl_createv(clog, 0, NULL, NULL,
444 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
445 CTLTYPE_INT, "recvspace",
446 SYSCTL_DESCR("Default UDP receive buffer size"),
447 NULL, 0, &udp6_recvspace, 0,
448 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE,
449 CTL_EOL);
450 sysctl_createv(clog, 0, NULL, NULL,
451 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
452 CTLTYPE_INT, "do_loopback_cksum",
453 SYSCTL_DESCR("Perform UDP checksum on loopback"),
454 NULL, 0, &udp_do_loopback_cksum, 0,
455 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM,
456 CTL_EOL);
457 sysctl_createv(clog, 0, NULL, NULL,
458 CTLFLAG_PERMANENT,
459 CTLTYPE_STRUCT, "pcblist",
460 SYSCTL_DESCR("UDP protocol control block list"),
461 sysctl_inpcblist, 0, &udbtable, 0,
462 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE,
463 CTL_EOL);
464 sysctl_createv(clog, 0, NULL, NULL,
465 CTLFLAG_PERMANENT,
466 CTLTYPE_STRUCT, "stats",
467 SYSCTL_DESCR("UDPv6 statistics"),
468 sysctl_net_inet6_udp6_stats, 0, NULL, 0,
469 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS,
470 CTL_EOL);
471 }
472
473 void
474 udp6_statinc(u_int stat)
475 {
476
477 KASSERT(stat < UDP6_NSTATS);
478 UDP6_STATINC(stat);
479 }
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