xref: /freebsd/sys/netinet6/raw_ip6.c (revision 6c6c03be2ddb04c54e455122799923deaefa4114)
1 /*-
2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the project nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 /*-
31  * Copyright (c) 1982, 1986, 1988, 1993
32  *	The Regents of the University of California.
33  * All rights reserved.
34  *
35  * Redistribution and use in source and binary forms, with or without
36  * modification, are permitted provided that the following conditions
37  * are met:
38  * 1. Redistributions of source code must retain the above copyright
39  *    notice, this list of conditions and the following disclaimer.
40  * 2. Redistributions in binary form must reproduce the above copyright
41  *    notice, this list of conditions and the following disclaimer in the
42  *    documentation and/or other materials provided with the distribution.
43  * 4. Neither the name of the University nor the names of its contributors
44  *    may be used to endorse or promote products derived from this software
45  *    without specific prior written permission.
46  *
47  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57  * SUCH DAMAGE.
58  *
59  *	@(#)raw_ip.c	8.2 (Berkeley) 1/4/94
60  */
61 
62 #include <sys/cdefs.h>
63 __FBSDID("$FreeBSD$");
64 
65 #include "opt_ipsec.h"
66 #include "opt_inet6.h"
67 
68 #include <sys/param.h>
69 #include <sys/errno.h>
70 #include <sys/lock.h>
71 #include <sys/malloc.h>
72 #include <sys/mbuf.h>
73 #include <sys/priv.h>
74 #include <sys/proc.h>
75 #include <sys/protosw.h>
76 #include <sys/signalvar.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/sx.h>
80 #include <sys/syslog.h>
81 #include <sys/vimage.h>
82 
83 #include <net/if.h>
84 #include <net/if_types.h>
85 #include <net/route.h>
86 
87 #include <netinet/in.h>
88 #include <netinet/in_var.h>
89 #include <netinet/in_systm.h>
90 #include <netinet/icmp6.h>
91 #include <netinet/in_pcb.h>
92 #include <netinet/ip6.h>
93 #include <netinet6/ip6protosw.h>
94 #include <netinet6/ip6_mroute.h>
95 #include <netinet6/in6_pcb.h>
96 #include <netinet6/ip6_var.h>
97 #include <netinet6/nd6.h>
98 #include <netinet6/raw_ip6.h>
99 #include <netinet6/scope6_var.h>
100 
101 #ifdef IPSEC
102 #include <netipsec/ipsec.h>
103 #include <netipsec/ipsec6.h>
104 #endif /* IPSEC */
105 
106 #include <machine/stdarg.h>
107 
108 #define	satosin6(sa)	((struct sockaddr_in6 *)(sa))
109 #define	ifatoia6(ifa)	((struct in6_ifaddr *)(ifa))
110 
111 /*
112  * Raw interface to IP6 protocol.
113  */
114 
115 extern struct	inpcbhead ripcb;
116 extern struct	inpcbinfo ripcbinfo;
117 extern u_long	rip_sendspace;
118 extern u_long	rip_recvspace;
119 
120 struct rip6stat rip6stat;
121 
122 /*
123  * Hooks for multicast forwarding.
124  */
125 struct socket *ip6_mrouter = NULL;
126 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
127 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
128 int (*ip6_mrouter_done)(void);
129 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
130 int (*mrt6_ioctl)(int, caddr_t);
131 
132 /*
133  * Setup generic address and protocol structures for raw_input routine, then
134  * pass them along with mbuf chain.
135  */
136 int
137 rip6_input(struct mbuf **mp, int *offp, int proto)
138 {
139 	INIT_VNET_INET(curvnet);
140 	INIT_VNET_INET6(curvnet);
141 #ifdef IPSEC
142 	INIT_VNET_IPSEC(curvnet);
143 #endif
144 	struct mbuf *m = *mp;
145 	register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
146 	register struct inpcb *in6p;
147 	struct inpcb *last = 0;
148 	struct mbuf *opts = NULL;
149 	struct sockaddr_in6 fromsa;
150 
151 	V_rip6stat.rip6s_ipackets++;
152 
153 	if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
154 		/* XXX Send icmp6 host/port unreach? */
155 		m_freem(m);
156 		return (IPPROTO_DONE);
157 	}
158 
159 	init_sin6(&fromsa, m); /* general init */
160 
161 	INP_INFO_RLOCK(&V_ripcbinfo);
162 	LIST_FOREACH(in6p, &V_ripcb, inp_list) {
163 		if ((in6p->in6p_vflag & INP_IPV6) == 0)
164 			continue;
165 		if (in6p->in6p_ip6_nxt &&
166 		    in6p->in6p_ip6_nxt != proto)
167 			continue;
168 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
169 		    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
170 			continue;
171 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
172 		    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
173 			continue;
174 		INP_RLOCK(in6p);
175 		if (in6p->in6p_cksum != -1) {
176 			V_rip6stat.rip6s_isum++;
177 			if (in6_cksum(m, proto, *offp,
178 			    m->m_pkthdr.len - *offp)) {
179 				INP_RUNLOCK(in6p);
180 				V_rip6stat.rip6s_badsum++;
181 				continue;
182 			}
183 		}
184 		if (last) {
185 			struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
186 
187 #ifdef IPSEC
188 			/*
189 			 * Check AH/ESP integrity.
190 			 */
191 			if (n && ipsec6_in_reject(n, last)) {
192 				m_freem(n);
193 				V_ipsec6stat.in_polvio++;
194 				/* Do not inject data into pcb. */
195 			} else
196 #endif /* IPSEC */
197 			if (n) {
198 				if (last->in6p_flags & IN6P_CONTROLOPTS ||
199 				    last->in6p_socket->so_options & SO_TIMESTAMP)
200 					ip6_savecontrol(last, n, &opts);
201 				/* strip intermediate headers */
202 				m_adj(n, *offp);
203 				if (sbappendaddr(&last->in6p_socket->so_rcv,
204 						(struct sockaddr *)&fromsa,
205 						 n, opts) == 0) {
206 					m_freem(n);
207 					if (opts)
208 						m_freem(opts);
209 					V_rip6stat.rip6s_fullsock++;
210 				} else
211 					sorwakeup(last->in6p_socket);
212 				opts = NULL;
213 			}
214 			INP_RUNLOCK(last);
215 		}
216 		last = in6p;
217 	}
218 	INP_INFO_RUNLOCK(&V_ripcbinfo);
219 #ifdef IPSEC
220 	/*
221 	 * Check AH/ESP integrity.
222 	 */
223 	if (last && ipsec6_in_reject(m, last)) {
224 		m_freem(m);
225 		V_ipsec6stat.in_polvio++;
226 		V_ip6stat.ip6s_delivered--;
227 		/* Do not inject data into pcb. */
228 		INP_RUNLOCK(last);
229 	} else
230 #endif /* IPSEC */
231 	if (last) {
232 		if (last->in6p_flags & IN6P_CONTROLOPTS ||
233 		    last->in6p_socket->so_options & SO_TIMESTAMP)
234 			ip6_savecontrol(last, m, &opts);
235 		/* Strip intermediate headers. */
236 		m_adj(m, *offp);
237 		if (sbappendaddr(&last->in6p_socket->so_rcv,
238 		    (struct sockaddr *)&fromsa, m, opts) == 0) {
239 			m_freem(m);
240 			if (opts)
241 				m_freem(opts);
242 			V_rip6stat.rip6s_fullsock++;
243 		} else
244 			sorwakeup(last->in6p_socket);
245 		INP_RUNLOCK(last);
246 	} else {
247 		V_rip6stat.rip6s_nosock++;
248 		if (m->m_flags & M_MCAST)
249 			V_rip6stat.rip6s_nosockmcast++;
250 		if (proto == IPPROTO_NONE)
251 			m_freem(m);
252 		else {
253 			char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
254 			icmp6_error(m, ICMP6_PARAM_PROB,
255 			    ICMP6_PARAMPROB_NEXTHEADER,
256 			    prvnxtp - mtod(m, char *));
257 		}
258 		V_ip6stat.ip6s_delivered--;
259 	}
260 	return (IPPROTO_DONE);
261 }
262 
263 void
264 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
265 {
266 	INIT_VNET_INET(curvnet);
267 	struct ip6_hdr *ip6;
268 	struct mbuf *m;
269 	int off = 0;
270 	struct ip6ctlparam *ip6cp = NULL;
271 	const struct sockaddr_in6 *sa6_src = NULL;
272 	void *cmdarg;
273 	struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
274 
275 	if (sa->sa_family != AF_INET6 ||
276 	    sa->sa_len != sizeof(struct sockaddr_in6))
277 		return;
278 
279 	if ((unsigned)cmd >= PRC_NCMDS)
280 		return;
281 	if (PRC_IS_REDIRECT(cmd))
282 		notify = in6_rtchange, d = NULL;
283 	else if (cmd == PRC_HOSTDEAD)
284 		d = NULL;
285 	else if (inet6ctlerrmap[cmd] == 0)
286 		return;
287 
288 	/*
289 	 * If the parameter is from icmp6, decode it.
290 	 */
291 	if (d != NULL) {
292 		ip6cp = (struct ip6ctlparam *)d;
293 		m = ip6cp->ip6c_m;
294 		ip6 = ip6cp->ip6c_ip6;
295 		off = ip6cp->ip6c_off;
296 		cmdarg = ip6cp->ip6c_cmdarg;
297 		sa6_src = ip6cp->ip6c_src;
298 	} else {
299 		m = NULL;
300 		ip6 = NULL;
301 		cmdarg = NULL;
302 		sa6_src = &sa6_any;
303 	}
304 
305 	(void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
306 	    (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
307 }
308 
309 /*
310  * Generate IPv6 header and pass packet to ip6_output.  Tack on options user
311  * may have setup with control call.
312  */
313 int
314 #if __STDC__
315 rip6_output(struct mbuf *m, ...)
316 #else
317 rip6_output(m, va_alist)
318 	struct mbuf *m;
319 	va_dcl
320 #endif
321 {
322 	INIT_VNET_INET6(curvnet);
323 	struct mbuf *control;
324 	struct socket *so;
325 	struct sockaddr_in6 *dstsock;
326 	struct in6_addr *dst;
327 	struct ip6_hdr *ip6;
328 	struct inpcb *in6p;
329 	u_int	plen = m->m_pkthdr.len;
330 	int error = 0;
331 	struct ip6_pktopts opt, *optp;
332 	struct ifnet *oifp = NULL;
333 	int type = 0, code = 0;		/* for ICMPv6 output statistics only */
334 	int scope_ambiguous = 0;
335 	struct in6_addr *in6a;
336 	va_list ap;
337 
338 	va_start(ap, m);
339 	so = va_arg(ap, struct socket *);
340 	dstsock = va_arg(ap, struct sockaddr_in6 *);
341 	control = va_arg(ap, struct mbuf *);
342 	va_end(ap);
343 
344 	in6p = sotoin6pcb(so);
345 	INP_WLOCK(in6p);
346 
347 	dst = &dstsock->sin6_addr;
348 	if (control) {
349 		if ((error = ip6_setpktopts(control, &opt,
350 		    in6p->in6p_outputopts, so->so_cred,
351 		    so->so_proto->pr_protocol)) != 0) {
352 			goto bad;
353 		}
354 		optp = &opt;
355 	} else
356 		optp = in6p->in6p_outputopts;
357 
358 	/*
359 	 * Check and convert scope zone ID into internal form.
360 	 *
361 	 * XXX: we may still need to determine the zone later.
362 	 */
363 	if (!(so->so_state & SS_ISCONNECTED)) {
364 		if (dstsock->sin6_scope_id == 0 && !V_ip6_use_defzone)
365 			scope_ambiguous = 1;
366 		if ((error = sa6_embedscope(dstsock, V_ip6_use_defzone)) != 0)
367 			goto bad;
368 	}
369 
370 	/*
371 	 * For an ICMPv6 packet, we should know its type and code to update
372 	 * statistics.
373 	 */
374 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
375 		struct icmp6_hdr *icmp6;
376 		if (m->m_len < sizeof(struct icmp6_hdr) &&
377 		    (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
378 			error = ENOBUFS;
379 			goto bad;
380 		}
381 		icmp6 = mtod(m, struct icmp6_hdr *);
382 		type = icmp6->icmp6_type;
383 		code = icmp6->icmp6_code;
384 	}
385 
386 	M_PREPEND(m, sizeof(*ip6), M_DONTWAIT);
387 	if (m == NULL) {
388 		error = ENOBUFS;
389 		goto bad;
390 	}
391 	ip6 = mtod(m, struct ip6_hdr *);
392 
393 	/*
394 	 * Source address selection.
395 	 */
396 	if ((in6a = in6_selectsrc(dstsock, optp, in6p, NULL, so->so_cred,
397 	    &oifp, &error)) == NULL) {
398 		if (error == 0)
399 			error = EADDRNOTAVAIL;
400 		goto bad;
401 	}
402 	ip6->ip6_src = *in6a;
403 
404 	if (oifp && scope_ambiguous) {
405 		/*
406 		 * Application should provide a proper zone ID or the use of
407 		 * default zone IDs should be enabled.  Unfortunately, some
408 		 * applications do not behave as it should, so we need a
409 		 * workaround.  Even if an appropriate ID is not determined
410 		 * (when it's required), if we can determine the outgoing
411 		 * interface. determine the zone ID based on the interface.
412 		 */
413 		error = in6_setscope(&dstsock->sin6_addr, oifp, NULL);
414 		if (error != 0)
415 			goto bad;
416 	}
417 	ip6->ip6_dst = dstsock->sin6_addr;
418 
419 	/*
420 	 * Fill in the rest of the IPv6 header fields.
421 	 */
422 	ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
423 	    (in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK);
424 	ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
425 	    (IPV6_VERSION & IPV6_VERSION_MASK);
426 
427 	/*
428 	 * ip6_plen will be filled in ip6_output, so not fill it here.
429 	 */
430 	ip6->ip6_nxt = in6p->in6p_ip6_nxt;
431 	ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
432 
433 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
434 	    in6p->in6p_cksum != -1) {
435 		struct mbuf *n;
436 		int off;
437 		u_int16_t *p;
438 
439 		/* Compute checksum. */
440 		if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
441 			off = offsetof(struct icmp6_hdr, icmp6_cksum);
442 		else
443 			off = in6p->in6p_cksum;
444 		if (plen < off + 1) {
445 			error = EINVAL;
446 			goto bad;
447 		}
448 		off += sizeof(struct ip6_hdr);
449 
450 		n = m;
451 		while (n && n->m_len <= off) {
452 			off -= n->m_len;
453 			n = n->m_next;
454 		}
455 		if (!n)
456 			goto bad;
457 		p = (u_int16_t *)(mtod(n, caddr_t) + off);
458 		*p = 0;
459 		*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
460 	}
461 
462 	error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
463 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
464 		if (oifp)
465 			icmp6_ifoutstat_inc(oifp, type, code);
466 		V_icmp6stat.icp6s_outhist[type]++;
467 	} else
468 		V_rip6stat.rip6s_opackets++;
469 
470 	goto freectl;
471 
472  bad:
473 	if (m)
474 		m_freem(m);
475 
476  freectl:
477 	if (control) {
478 		ip6_clearpktopts(&opt, -1);
479 		m_freem(control);
480 	}
481 	INP_WUNLOCK(in6p);
482 	return (error);
483 }
484 
485 /*
486  * Raw IPv6 socket option processing.
487  */
488 int
489 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
490 {
491 	int error;
492 
493 	if (sopt->sopt_level == IPPROTO_ICMPV6)
494 		/*
495 		 * XXX: is it better to call icmp6_ctloutput() directly
496 		 * from protosw?
497 		 */
498 		return (icmp6_ctloutput(so, sopt));
499 	else if (sopt->sopt_level != IPPROTO_IPV6)
500 		return (EINVAL);
501 
502 	error = 0;
503 
504 	switch (sopt->sopt_dir) {
505 	case SOPT_GET:
506 		switch (sopt->sopt_name) {
507 		case MRT6_INIT:
508 		case MRT6_DONE:
509 		case MRT6_ADD_MIF:
510 		case MRT6_DEL_MIF:
511 		case MRT6_ADD_MFC:
512 		case MRT6_DEL_MFC:
513 		case MRT6_PIM:
514 			error = ip6_mrouter_get ?  ip6_mrouter_get(so, sopt) :
515 			    EOPNOTSUPP;
516 			break;
517 		case IPV6_CHECKSUM:
518 			error = ip6_raw_ctloutput(so, sopt);
519 			break;
520 		default:
521 			error = ip6_ctloutput(so, sopt);
522 			break;
523 		}
524 		break;
525 
526 	case SOPT_SET:
527 		switch (sopt->sopt_name) {
528 		case MRT6_INIT:
529 		case MRT6_DONE:
530 		case MRT6_ADD_MIF:
531 		case MRT6_DEL_MIF:
532 		case MRT6_ADD_MFC:
533 		case MRT6_DEL_MFC:
534 		case MRT6_PIM:
535 			error = ip6_mrouter_set ?  ip6_mrouter_set(so, sopt) :
536 			    EOPNOTSUPP;
537 			break;
538 		case IPV6_CHECKSUM:
539 			error = ip6_raw_ctloutput(so, sopt);
540 			break;
541 		default:
542 			error = ip6_ctloutput(so, sopt);
543 			break;
544 		}
545 		break;
546 	}
547 
548 	return (error);
549 }
550 
551 static int
552 rip6_attach(struct socket *so, int proto, struct thread *td)
553 {
554 	INIT_VNET_INET(so->so_vnet);
555 	struct inpcb *inp;
556 	struct icmp6_filter *filter;
557 	int error;
558 
559 	inp = sotoinpcb(so);
560 	KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
561 
562 	error = priv_check(td, PRIV_NETINET_RAW);
563 	if (error)
564 		return (error);
565 	error = soreserve(so, rip_sendspace, rip_recvspace);
566 	if (error)
567 		return (error);
568 	filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
569 	if (filter == NULL)
570 		return (ENOMEM);
571 	INP_INFO_WLOCK(&V_ripcbinfo);
572 	error = in_pcballoc(so, &V_ripcbinfo);
573 	if (error) {
574 		INP_INFO_WUNLOCK(&V_ripcbinfo);
575 		free(filter, M_PCB);
576 		return (error);
577 	}
578 	inp = (struct inpcb *)so->so_pcb;
579 	INP_INFO_WUNLOCK(&V_ripcbinfo);
580 	inp->inp_vflag |= INP_IPV6;
581 	inp->in6p_ip6_nxt = (long)proto;
582 	inp->in6p_hops = -1;	/* use kernel default */
583 	inp->in6p_cksum = -1;
584 	inp->in6p_icmp6filt = filter;
585 	ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
586 	INP_WUNLOCK(inp);
587 	return (0);
588 }
589 
590 static void
591 rip6_detach(struct socket *so)
592 {
593 	INIT_VNET_INET(so->so_vnet);
594 	struct inpcb *inp;
595 
596 	inp = sotoinpcb(so);
597 	KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
598 
599 	if (so == ip6_mrouter && ip6_mrouter_done)
600 		ip6_mrouter_done();
601 	/* xxx: RSVP */
602 	INP_INFO_WLOCK(&V_ripcbinfo);
603 	INP_WLOCK(inp);
604 	free(inp->in6p_icmp6filt, M_PCB);
605 	in6_pcbdetach(inp);
606 	in6_pcbfree(inp);
607 	INP_INFO_WUNLOCK(&V_ripcbinfo);
608 }
609 
610 /* XXXRW: This can't ever be called. */
611 static void
612 rip6_abort(struct socket *so)
613 {
614 	struct inpcb *inp;
615 
616 	inp = sotoinpcb(so);
617 	KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
618 
619 	soisdisconnected(so);
620 }
621 
622 static void
623 rip6_close(struct socket *so)
624 {
625 	struct inpcb *inp;
626 
627 	inp = sotoinpcb(so);
628 	KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
629 
630 	soisdisconnected(so);
631 }
632 
633 static int
634 rip6_disconnect(struct socket *so)
635 {
636 	struct inpcb *inp;
637 
638 	inp = sotoinpcb(so);
639 	KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
640 
641 	if ((so->so_state & SS_ISCONNECTED) == 0)
642 		return (ENOTCONN);
643 	inp->in6p_faddr = in6addr_any;
644 	rip6_abort(so);
645 	return (0);
646 }
647 
648 static int
649 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
650 {
651 	INIT_VNET_NET(so->so_vnet);
652 	INIT_VNET_INET(so->so_vnet);
653 	INIT_VNET_INET6(so->so_vnet);
654 	struct inpcb *inp;
655 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
656 	struct ifaddr *ia = NULL;
657 	int error = 0;
658 
659 	inp = sotoinpcb(so);
660 	KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
661 
662 	if (nam->sa_len != sizeof(*addr))
663 		return (EINVAL);
664 	if (TAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
665 		return (EADDRNOTAVAIL);
666 	if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
667 		return (error);
668 
669 	if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
670 	    (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)
671 		return (EADDRNOTAVAIL);
672 	if (ia &&
673 	    ((struct in6_ifaddr *)ia)->ia6_flags &
674 	    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
675 	     IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
676 		return (EADDRNOTAVAIL);
677 	}
678 	INP_INFO_WLOCK(&V_ripcbinfo);
679 	INP_WLOCK(inp);
680 	inp->in6p_laddr = addr->sin6_addr;
681 	INP_WUNLOCK(inp);
682 	INP_INFO_WUNLOCK(&V_ripcbinfo);
683 	return (0);
684 }
685 
686 static int
687 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
688 {
689 	INIT_VNET_NET(so->so_vnet);
690 	INIT_VNET_INET(so->so_vnet);
691 	INIT_VNET_INET6(so->so_vnet);
692 	struct inpcb *inp;
693 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
694 	struct in6_addr *in6a = NULL;
695 	struct ifnet *ifp = NULL;
696 	int error = 0, scope_ambiguous = 0;
697 
698 	inp = sotoinpcb(so);
699 	KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
700 
701 	if (nam->sa_len != sizeof(*addr))
702 		return (EINVAL);
703 	if (TAILQ_EMPTY(&V_ifnet))
704 		return (EADDRNOTAVAIL);
705 	if (addr->sin6_family != AF_INET6)
706 		return (EAFNOSUPPORT);
707 
708 	/*
709 	 * Application should provide a proper zone ID or the use of default
710 	 * zone IDs should be enabled.  Unfortunately, some applications do
711 	 * not behave as it should, so we need a workaround.  Even if an
712 	 * appropriate ID is not determined, we'll see if we can determine
713 	 * the outgoing interface.  If we can, determine the zone ID based on
714 	 * the interface below.
715 	 */
716 	if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
717 		scope_ambiguous = 1;
718 	if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
719 		return (error);
720 
721 	INP_INFO_WLOCK(&V_ripcbinfo);
722 	INP_WLOCK(inp);
723 	/* Source address selection. XXX: need pcblookup? */
724 	in6a = in6_selectsrc(addr, inp->in6p_outputopts,
725 			     inp, NULL, so->so_cred,
726 			     &ifp, &error);
727 	if (in6a == NULL) {
728 		INP_WUNLOCK(inp);
729 		INP_INFO_WUNLOCK(&V_ripcbinfo);
730 		return (error ? error : EADDRNOTAVAIL);
731 	}
732 
733 	/* XXX: see above */
734 	if (ifp && scope_ambiguous &&
735 	    (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) {
736 		INP_WUNLOCK(inp);
737 		INP_INFO_WUNLOCK(&V_ripcbinfo);
738 		return (error);
739 	}
740 	inp->in6p_faddr = addr->sin6_addr;
741 	inp->in6p_laddr = *in6a;
742 	soisconnected(so);
743 	INP_WUNLOCK(inp);
744 	INP_INFO_WUNLOCK(&V_ripcbinfo);
745 	return (0);
746 }
747 
748 static int
749 rip6_shutdown(struct socket *so)
750 {
751 	struct inpcb *inp;
752 
753 	inp = sotoinpcb(so);
754 	KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
755 
756 	INP_WLOCK(inp);
757 	socantsendmore(so);
758 	INP_WUNLOCK(inp);
759 	return (0);
760 }
761 
762 static int
763 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
764     struct mbuf *control, struct thread *td)
765 {
766 	INIT_VNET_INET(so->so_vnet);
767 	struct inpcb *inp;
768 	struct sockaddr_in6 tmp;
769 	struct sockaddr_in6 *dst;
770 	int ret;
771 
772 	inp = sotoinpcb(so);
773 	KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
774 
775 	/* Always copy sockaddr to avoid overwrites. */
776 	/* Unlocked read. */
777 	if (so->so_state & SS_ISCONNECTED) {
778 		if (nam) {
779 			m_freem(m);
780 			return (EISCONN);
781 		}
782 		/* XXX */
783 		bzero(&tmp, sizeof(tmp));
784 		tmp.sin6_family = AF_INET6;
785 		tmp.sin6_len = sizeof(struct sockaddr_in6);
786 		INP_RLOCK(inp);
787 		bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
788 		    sizeof(struct in6_addr));
789 		INP_RUNLOCK(inp);
790 		dst = &tmp;
791 	} else {
792 		if (nam == NULL) {
793 			m_freem(m);
794 			return (ENOTCONN);
795 		}
796 		if (nam->sa_len != sizeof(struct sockaddr_in6)) {
797 			m_freem(m);
798 			return (EINVAL);
799 		}
800 		tmp = *(struct sockaddr_in6 *)nam;
801 		dst = &tmp;
802 
803 		if (dst->sin6_family == AF_UNSPEC) {
804 			/*
805 			 * XXX: we allow this case for backward
806 			 * compatibility to buggy applications that
807 			 * rely on old (and wrong) kernel behavior.
808 			 */
809 			log(LOG_INFO, "rip6 SEND: address family is "
810 			    "unspec. Assume AF_INET6\n");
811 			dst->sin6_family = AF_INET6;
812 		} else if (dst->sin6_family != AF_INET6) {
813 			m_freem(m);
814 			return(EAFNOSUPPORT);
815 		}
816 	}
817 	ret = rip6_output(m, so, dst, control);
818 	return (ret);
819 }
820 
821 struct pr_usrreqs rip6_usrreqs = {
822 	.pru_abort =		rip6_abort,
823 	.pru_attach =		rip6_attach,
824 	.pru_bind =		rip6_bind,
825 	.pru_connect =		rip6_connect,
826 	.pru_control =		in6_control,
827 	.pru_detach =		rip6_detach,
828 	.pru_disconnect =	rip6_disconnect,
829 	.pru_peeraddr =		in6_getpeeraddr,
830 	.pru_send =		rip6_send,
831 	.pru_shutdown =		rip6_shutdown,
832 	.pru_sockaddr =		in6_getsockaddr,
833 	.pru_close =		rip6_close,
834 };
835