xref: /netbsd-src/sys/netinet6/udp6_usrreq.c (revision da5f4674a3fc214be3572d358b66af40ab9401e7) 
1 /*	$NetBSD: udp6_usrreq.c,v 1.57 2003/08/22 22:05:11 itojun 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 1.57 2003/08/22 22:05:11 itojun 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/ip6protosw.h>
98 
99 #include "faith.h"
100 #if defined(NFAITH) && NFAITH > 0
101 #include <net/if_faith.h>
102 #endif
103 
104 /*
105  * UDP protocol inplementation.
106  * Per RFC 768, August, 1980.
107  */
108 
109 struct	in6pcb udb6;
110 struct	in6pcb *udp6_last_in6pcb = &udb6;
111 struct	udp6stat udp6stat;
112 
113 static	void udp6_detach __P((struct in6pcb *));
114 static	void udp6_notify __P((struct in6pcb *, int));
115 
116 void
117 udp6_init()
118 {
119 	udb6.in6p_next = udb6.in6p_prev = &udb6;
120 }
121 
122 /*
123  * Notify a udp user of an asynchronous error;
124  * just wake up so that he can collect error status.
125  */
126 static	void
127 udp6_notify(in6p, errno)
128 	struct in6pcb *in6p;
129 	int errno;
130 {
131 	in6p->in6p_socket->so_error = errno;
132 	sorwakeup(in6p->in6p_socket);
133 	sowwakeup(in6p->in6p_socket);
134 }
135 
136 void
137 udp6_ctlinput(cmd, sa, d)
138 	int cmd;
139 	struct sockaddr *sa;
140 	void *d;
141 {
142 	struct udphdr uh;
143 	struct ip6_hdr *ip6;
144 	struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
145 	struct mbuf *m;
146 	int off;
147 	void *cmdarg;
148 	struct ip6ctlparam *ip6cp = NULL;
149 	const struct sockaddr_in6 *sa6_src = NULL;
150 	void (*notify) __P((struct in6pcb *, int)) = udp6_notify;
151 	struct udp_portonly {
152 		u_int16_t uh_sport;
153 		u_int16_t uh_dport;
154 	} *uhp;
155 
156 	if (sa->sa_family != AF_INET6 ||
157 	    sa->sa_len != sizeof(struct sockaddr_in6))
158 		return;
159 
160 	if ((unsigned)cmd >= PRC_NCMDS)
161 		return;
162 	if (PRC_IS_REDIRECT(cmd))
163 		notify = in6_rtchange, d = NULL;
164 	else if (cmd == PRC_HOSTDEAD)
165 		d = NULL;
166 	else if (cmd == PRC_MSGSIZE) {
167 		/* special code is present, see below */
168 		notify = in6_rtchange;
169 	}
170 	else if (inet6ctlerrmap[cmd] == 0)
171 		return;
172 
173 	/* if the parameter is from icmp6, decode it. */
174 	if (d != NULL) {
175 		ip6cp = (struct ip6ctlparam *)d;
176 		m = ip6cp->ip6c_m;
177 		ip6 = ip6cp->ip6c_ip6;
178 		off = ip6cp->ip6c_off;
179 		cmdarg = ip6cp->ip6c_cmdarg;
180 		sa6_src = ip6cp->ip6c_src;
181 	} else {
182 		m = NULL;
183 		ip6 = NULL;
184 		cmdarg = NULL;
185 		sa6_src = &sa6_any;
186 	}
187 
188 	if (ip6) {
189 		/*
190 		 * XXX: We assume that when IPV6 is non NULL,
191 		 * M and OFF are valid.
192 		 */
193 
194 		/* check if we can safely examine src and dst ports */
195 		if (m->m_pkthdr.len < off + sizeof(*uhp)) {
196 			if (cmd == PRC_MSGSIZE)
197 				icmp6_mtudisc_update((struct ip6ctlparam *)d, 0);
198 			return;
199 		}
200 
201 		bzero(&uh, sizeof(uh));
202 		m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
203 
204 		if (cmd == PRC_MSGSIZE) {
205 			int valid = 0;
206 
207 			/*
208 			 * Check to see if we have a valid UDP socket
209 			 * corresponding to the address in the ICMPv6 message
210 			 * payload.
211 			 */
212 			if (in6_pcblookup_connect(&udb6, &sa6->sin6_addr,
213 			    uh.uh_dport, (struct in6_addr *)&sa6_src->sin6_addr,
214 			    uh.uh_sport, 0))
215 				valid++;
216 #if 0
217 			/*
218 			 * As the use of sendto(2) is fairly popular,
219 			 * we may want to allow non-connected pcb too.
220 			 * But it could be too weak against attacks...
221 			 * We should at least check if the local address (= s)
222 			 * is really ours.
223 			 */
224 			else if (in6_pcblookup_bind(&udb6, &sa6->sin6_addr,
225 						    uh.uh_dport, 0))
226 				valid++;
227 #endif
228 
229 			/*
230 			 * Depending on the value of "valid" and routing table
231 			 * size (mtudisc_{hi,lo}wat), we will:
232 			 * - recalculate the new MTU and create the
233 			 *   corresponding routing entry, or
234 			 * - ignore the MTU change notification.
235 			 */
236 			icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
237 
238 			/*
239 			 * regardless of if we called icmp6_mtudisc_update(),
240 			 * we need to call in6_pcbnotify(), to notify path
241 			 * MTU change to the userland (2292bis-02), because
242 			 * some unconnected sockets may share the same
243 			 * destination and want to know the path MTU.
244 			 */
245 		}
246 
247 		(void) in6_pcbnotify(&udb6, sa, uh.uh_dport,
248 		    (struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg,
249 		    notify);
250 	} else {
251 		(void) in6_pcbnotify(&udb6, sa, 0, (struct sockaddr *)sa6_src,
252 		    0, cmd, cmdarg, notify);
253 	}
254 }
255 
256 extern	int udp6_sendspace;
257 extern	int udp6_recvspace;
258 
259 int
260 udp6_usrreq(so, req, m, addr6, control, p)
261 	struct socket *so;
262 	int req;
263 	struct mbuf *m, *addr6, *control;
264 	struct proc *p;
265 {
266 	struct	in6pcb *in6p = sotoin6pcb(so);
267 	int	error = 0;
268 	int	s;
269 
270 	/*
271 	 * MAPPED_ADDR implementation info:
272 	 *  Mapped addr support for PRU_CONTROL is not necessary.
273 	 *  Because typical user of PRU_CONTROL is such as ifconfig,
274 	 *  and they don't associate any addr to their socket.  Then
275 	 *  socket family is only hint about the PRU_CONTROL'ed address
276 	 *  family, especially when getting addrs from kernel.
277 	 *  So AF_INET socket need to be used to control AF_INET addrs,
278 	 *  and AF_INET6 socket for AF_INET6 addrs.
279 	 */
280 	if (req == PRU_CONTROL)
281 		return (in6_control(so, (u_long)m, (caddr_t)addr6,
282 				   (struct ifnet *)control, p));
283 
284 	if (req == PRU_PURGEIF) {
285 		in6_pcbpurgeif0(&udb6, (struct ifnet *)control);
286 		in6_purgeif((struct ifnet *)control);
287 		in6_pcbpurgeif(&udb6, (struct ifnet *)control);
288 		return (0);
289 	}
290 
291 	if (in6p == NULL && req != PRU_ATTACH) {
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, &udb6);
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 		udp6_detach(in6p);
321 		break;
322 
323 	case PRU_BIND:
324 		s = splsoftnet();
325 		error = in6_pcbbind(in6p, addr6, p);
326 		splx(s);
327 		break;
328 
329 	case PRU_LISTEN:
330 		error = EOPNOTSUPP;
331 		break;
332 
333 	case PRU_CONNECT:
334 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
335 			error = EISCONN;
336 			break;
337 		}
338 		s = splsoftnet();
339 		error = in6_pcbconnect(in6p, addr6);
340 		if (ip6_auto_flowlabel) {
341 			in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
342 			in6p->in6p_flowinfo |=
343 				(htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
344 		}
345 		splx(s);
346 		if (error == 0)
347 			soisconnected(so);
348 		break;
349 
350 	case PRU_CONNECT2:
351 		error = EOPNOTSUPP;
352 		break;
353 
354 	case PRU_ACCEPT:
355 		error = EOPNOTSUPP;
356 		break;
357 
358 	case PRU_DISCONNECT:
359 		if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
360 			error = ENOTCONN;
361 			break;
362 		}
363 		s = splsoftnet();
364 		in6_pcbdisconnect(in6p);
365 		bzero((caddr_t)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr));
366 		splx(s);
367 		so->so_state &= ~SS_ISCONNECTED;		/* XXX */
368 		break;
369 
370 	case PRU_SHUTDOWN:
371 		socantsendmore(so);
372 		break;
373 
374 	case PRU_SEND:
375 		return (udp6_output(in6p, m, addr6, control, p));
376 
377 	case PRU_ABORT:
378 		soisdisconnected(so);
379 		udp6_detach(in6p);
380 		break;
381 
382 	case PRU_SOCKADDR:
383 		in6_setsockaddr(in6p, addr6);
384 		break;
385 
386 	case PRU_PEERADDR:
387 		in6_setpeeraddr(in6p, addr6);
388 		break;
389 
390 	case PRU_SENSE:
391 		/*
392 		 * stat: don't bother with a blocksize
393 		 */
394 		return (0);
395 
396 	case PRU_SENDOOB:
397 	case PRU_FASTTIMO:
398 	case PRU_SLOWTIMO:
399 	case PRU_PROTORCV:
400 	case PRU_PROTOSEND:
401 		error = EOPNOTSUPP;
402 		break;
403 
404 	case PRU_RCVD:
405 	case PRU_RCVOOB:
406 		return (EOPNOTSUPP);	/* do not free mbuf's */
407 
408 	default:
409 		panic("udp6_usrreq");
410 	}
411 
412 release:
413 	if (control)
414 		m_freem(control);
415 	if (m)
416 		m_freem(m);
417 	return (error);
418 }
419 
420 static void
421 udp6_detach(in6p)
422 	struct in6pcb *in6p;
423 {
424 	int s = splsoftnet();
425 
426 	if (in6p == udp6_last_in6pcb)
427 		udp6_last_in6pcb = &udb6;
428 	in6_pcbdetach(in6p);
429 	splx(s);
430 }
431 
432 int
433 udp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
434 	int *name;
435 	u_int namelen;
436 	void *oldp;
437 	size_t *oldlenp;
438 	void *newp;
439 	size_t newlen;
440 {
441 	/* All sysctl names at this level are terminal. */
442 	if (namelen != 1)
443 		return ENOTDIR;
444 
445 	switch (name[0]) {
446 
447 	case UDP6CTL_SENDSPACE:
448 		return sysctl_int(oldp, oldlenp, newp, newlen,
449 		    &udp6_sendspace);
450 	case UDP6CTL_RECVSPACE:
451 		return sysctl_int(oldp, oldlenp, newp, newlen,
452 		    &udp6_recvspace);
453 	default:
454 		return ENOPROTOOPT;
455 	}
456 	/* NOTREACHED */
457 }
458