xref: /freebsd/sys/netinet6/raw_ip6.c (revision 29fc4075e69fd27de0cded313ac6000165d99f8b)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the project nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 /*-
33  * Copyright (c) 1982, 1986, 1988, 1993
34  *	The Regents of the University of California.
35  * 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  *	@(#)raw_ip.c	8.2 (Berkeley) 1/4/94
62  */
63 
64 #include <sys/cdefs.h>
65 __FBSDID("$FreeBSD$");
66 
67 #include "opt_ipsec.h"
68 #include "opt_inet6.h"
69 #include "opt_route.h"
70 
71 #include <sys/param.h>
72 #include <sys/errno.h>
73 #include <sys/jail.h>
74 #include <sys/kernel.h>
75 #include <sys/lock.h>
76 #include <sys/malloc.h>
77 #include <sys/mbuf.h>
78 #include <sys/priv.h>
79 #include <sys/proc.h>
80 #include <sys/protosw.h>
81 #include <sys/signalvar.h>
82 #include <sys/socket.h>
83 #include <sys/socketvar.h>
84 #include <sys/sx.h>
85 #include <sys/syslog.h>
86 
87 #include <net/if.h>
88 #include <net/if_var.h>
89 #include <net/if_types.h>
90 #include <net/route.h>
91 #include <net/vnet.h>
92 
93 #include <netinet/in.h>
94 #include <netinet/in_var.h>
95 #include <netinet/in_systm.h>
96 #include <netinet/in_pcb.h>
97 
98 #include <netinet/icmp6.h>
99 #include <netinet/ip6.h>
100 #include <netinet/ip_var.h>
101 #include <netinet6/ip6protosw.h>
102 #include <netinet6/ip6_mroute.h>
103 #include <netinet6/in6_pcb.h>
104 #include <netinet6/ip6_var.h>
105 #include <netinet6/nd6.h>
106 #include <netinet6/raw_ip6.h>
107 #include <netinet6/in6_fib.h>
108 #include <netinet6/scope6_var.h>
109 #include <netinet6/send.h>
110 
111 #include <netipsec/ipsec_support.h>
112 
113 #include <machine/stdarg.h>
114 
115 #define	satosin6(sa)	((struct sockaddr_in6 *)(sa))
116 #define	ifatoia6(ifa)	((struct in6_ifaddr *)(ifa))
117 
118 /*
119  * Raw interface to IP6 protocol.
120  */
121 
122 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
123 #define	V_ripcbinfo			VNET(ripcbinfo)
124 
125 extern u_long	rip_sendspace;
126 extern u_long	rip_recvspace;
127 
128 VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat);
129 VNET_PCPUSTAT_SYSINIT(rip6stat);
130 
131 #ifdef VIMAGE
132 VNET_PCPUSTAT_SYSUNINIT(rip6stat);
133 #endif /* VIMAGE */
134 
135 /*
136  * Hooks for multicast routing. They all default to NULL, so leave them not
137  * initialized and rely on BSS being set to 0.
138  */
139 
140 /*
141  * The socket used to communicate with the multicast routing daemon.
142  */
143 VNET_DEFINE(struct socket *, ip6_mrouter);
144 
145 /*
146  * The various mrouter functions.
147  */
148 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
149 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
150 int (*ip6_mrouter_done)(void);
151 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
152 int (*mrt6_ioctl)(u_long, caddr_t);
153 
154 struct rip6_inp_match_ctx {
155 	struct ip6_hdr *ip6;
156 	int proto;
157 };
158 
159 static bool
160 rip6_inp_match(const struct inpcb *inp, void *v)
161 {
162 	struct rip6_inp_match_ctx *c = v;
163 	struct ip6_hdr *ip6 = c->ip6;
164 	int proto = c->proto;
165 
166 	/* XXX inp locking */
167 	if ((inp->inp_vflag & INP_IPV6) == 0)
168 		return (false);
169 	if (inp->inp_ip_p && inp->inp_ip_p != proto)
170 		return (false);
171 	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
172 	    !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
173 		return (false);
174 	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
175 	    !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
176 		return (false);
177 
178 	return (true);
179 }
180 
181 /*
182  * Setup generic address and protocol structures for raw_input routine, then
183  * pass them along with mbuf chain.
184  */
185 int
186 rip6_input(struct mbuf **mp, int *offp, int proto)
187 {
188 	struct ifnet *ifp;
189 	struct mbuf *n, *m = *mp;
190 	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
191 	struct inpcb *inp;
192 	struct mbuf *opts = NULL;
193 	struct sockaddr_in6 fromsa;
194 	struct rip6_inp_match_ctx ctx = { .ip6 = ip6, .proto = proto };
195 	struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo,
196 	    INPLOOKUP_RLOCKPCB, rip6_inp_match, &ctx);
197 	int delivered = 0;
198 
199 	NET_EPOCH_ASSERT();
200 
201 	RIP6STAT_INC(rip6s_ipackets);
202 
203 	init_sin6(&fromsa, m, 0); /* general init */
204 
205 	ifp = m->m_pkthdr.rcvif;
206 
207 	while ((inp = inp_next(&inpi)) != NULL) {
208 		INP_RLOCK_ASSERT(inp);
209 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
210 		/*
211 		 * Check AH/ESP integrity.
212 		 */
213 		if (IPSEC_ENABLED(ipv6) &&
214 		    IPSEC_CHECK_POLICY(ipv6, m, inp) != 0) {
215 			/* Do not inject data into pcb. */
216 			continue;
217 		}
218 #endif /* IPSEC */
219 		if (jailed_without_vnet(inp->inp_cred) &&
220 		    !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
221 		    prison_check_ip6(inp->inp_cred, &ip6->ip6_dst) != 0)
222 			/*
223 			 * Allow raw socket in jail to receive multicast;
224 			 * assume process had PRIV_NETINET_RAW at attach,
225 			 * and fall through into normal filter path if so.
226 			 */
227 			continue;
228 		if (inp->in6p_cksum != -1) {
229 			RIP6STAT_INC(rip6s_isum);
230 			if (m->m_pkthdr.len - (*offp + inp->in6p_cksum) < 2 ||
231 			    in6_cksum(m, proto, *offp,
232 			    m->m_pkthdr.len - *offp)) {
233 				RIP6STAT_INC(rip6s_badsum);
234 				/*
235 				 * Drop the received message, don't send an
236 				 * ICMP6 message. Set proto to IPPROTO_NONE
237 				 * to achieve that.
238 				 */
239 				INP_RUNLOCK(inp);
240 				proto = IPPROTO_NONE;
241 				break;
242 			}
243 		}
244 		/*
245 		 * If this raw socket has multicast state, and we
246 		 * have received a multicast, check if this socket
247 		 * should receive it, as multicast filtering is now
248 		 * the responsibility of the transport layer.
249 		 */
250 		if (inp->in6p_moptions &&
251 		    IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
252 			/*
253 			 * If the incoming datagram is for MLD, allow it
254 			 * through unconditionally to the raw socket.
255 			 *
256 			 * Use the M_RTALERT_MLD flag to check for MLD
257 			 * traffic without having to inspect the mbuf chain
258 			 * more deeply, as all MLDv1/v2 host messages MUST
259 			 * contain the Router Alert option.
260 			 *
261 			 * In the case of MLDv1, we may not have explicitly
262 			 * joined the group, and may have set IFF_ALLMULTI
263 			 * on the interface. im6o_mc_filter() may discard
264 			 * control traffic we actually need to see.
265 			 *
266 			 * Userland multicast routing daemons should continue
267 			 * filter the control traffic appropriately.
268 			 */
269 			int blocked;
270 
271 			blocked = MCAST_PASS;
272 			if ((m->m_flags & M_RTALERT_MLD) == 0) {
273 				struct sockaddr_in6 mcaddr;
274 
275 				bzero(&mcaddr, sizeof(struct sockaddr_in6));
276 				mcaddr.sin6_len = sizeof(struct sockaddr_in6);
277 				mcaddr.sin6_family = AF_INET6;
278 				mcaddr.sin6_addr = ip6->ip6_dst;
279 
280 				blocked = im6o_mc_filter(inp->in6p_moptions,
281 				    ifp,
282 				    (struct sockaddr *)&mcaddr,
283 				    (struct sockaddr *)&fromsa);
284 			}
285 			if (blocked != MCAST_PASS) {
286 				IP6STAT_INC(ip6s_notmember);
287 				continue;
288 			}
289 		}
290 		if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL)
291 			continue;
292 		if (inp->inp_flags & INP_CONTROLOPTS ||
293 		    inp->inp_socket->so_options & SO_TIMESTAMP)
294 			ip6_savecontrol(inp, n, &opts);
295 		/* strip intermediate headers */
296 		m_adj(n, *offp);
297 		if (sbappendaddr(&inp->inp_socket->so_rcv,
298 		    (struct sockaddr *)&fromsa, n, opts) == 0) {
299 			soroverflow(inp->inp_socket);
300 			m_freem(n);
301 			if (opts)
302 				m_freem(opts);
303 			RIP6STAT_INC(rip6s_fullsock);
304 		} else {
305 			sorwakeup(inp->inp_socket);
306 			delivered++;
307 		}
308 		opts = NULL;
309 	}
310 	if (delivered == 0) {
311 		RIP6STAT_INC(rip6s_nosock);
312 		if (m->m_flags & M_MCAST)
313 			RIP6STAT_INC(rip6s_nosockmcast);
314 		if (proto == IPPROTO_NONE)
315 			m_freem(m);
316 		else
317 			icmp6_error(m, ICMP6_PARAM_PROB,
318 			    ICMP6_PARAMPROB_NEXTHEADER,
319 			    ip6_get_prevhdr(m, *offp));
320 		IP6STAT_DEC(ip6s_delivered);
321 	} else
322 		m_freem(m);
323 	return (IPPROTO_DONE);
324 }
325 
326 void
327 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
328 {
329 	struct ip6ctlparam *ip6cp = NULL;
330 	const struct sockaddr_in6 *sa6_src = NULL;
331 	void *cmdarg;
332 	struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
333 
334 	if (sa->sa_family != AF_INET6 ||
335 	    sa->sa_len != sizeof(struct sockaddr_in6))
336 		return;
337 
338 	if ((unsigned)cmd >= PRC_NCMDS)
339 		return;
340 	if (PRC_IS_REDIRECT(cmd))
341 		notify = in6_rtchange, d = NULL;
342 	else if (cmd == PRC_HOSTDEAD)
343 		d = NULL;
344 	else if (inet6ctlerrmap[cmd] == 0)
345 		return;
346 
347 	/*
348 	 * If the parameter is from icmp6, decode it.
349 	 */
350 	if (d != NULL) {
351 		ip6cp = (struct ip6ctlparam *)d;
352 		cmdarg = ip6cp->ip6c_cmdarg;
353 		sa6_src = ip6cp->ip6c_src;
354 	} else {
355 		cmdarg = NULL;
356 		sa6_src = &sa6_any;
357 	}
358 
359 	(void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
360 	    (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
361 }
362 
363 /*
364  * Generate IPv6 header and pass packet to ip6_output.  Tack on options user
365  * may have setup with control call.
366  */
367 static int
368 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
369     struct mbuf *control, struct thread *td)
370 {
371 	struct epoch_tracker et;
372 	struct inpcb *inp;
373 	struct sockaddr_in6 tmp, *dstsock;
374 	struct m_tag *mtag;
375 	struct ip6_hdr *ip6;
376 	u_int	plen = m->m_pkthdr.len;
377 	struct ip6_pktopts opt, *optp;
378 	struct ifnet *oifp = NULL;
379 	int error;
380 	int type = 0, code = 0;		/* for ICMPv6 output statistics only */
381 	int scope_ambiguous = 0;
382 	int use_defzone = 0;
383 	int hlim = 0;
384 	struct in6_addr in6a;
385 
386 	inp = sotoinpcb(so);
387 	KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
388 
389 	/* Always copy sockaddr to avoid overwrites. */
390 	/* Unlocked read. */
391 	if (so->so_state & SS_ISCONNECTED) {
392 		if (nam) {
393 			error = EISCONN;
394 			goto release;
395 		}
396 		tmp = (struct sockaddr_in6 ){
397 			.sin6_family = AF_INET6,
398 			.sin6_len = sizeof(struct sockaddr_in6),
399 		};
400 		INP_RLOCK(inp);
401 		bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
402 		    sizeof(struct in6_addr));
403 		INP_RUNLOCK(inp);
404 		dstsock = &tmp;
405 	} else {
406 		if (nam == NULL)
407 			error = ENOTCONN;
408 		else if (nam->sa_family != AF_INET6)
409 			error = EAFNOSUPPORT;
410 		else if (nam->sa_len != sizeof(struct sockaddr_in6))
411 			error = EINVAL;
412 		else
413 			error = 0;
414 		if (error != 0)
415 			goto release;
416 		dstsock = (struct sockaddr_in6 *)nam;
417 		if (dstsock->sin6_family != AF_INET6) {
418 			error = EAFNOSUPPORT;
419 			goto release;
420 		}
421 	}
422 
423 	INP_WLOCK(inp);
424 
425 	if (control != NULL) {
426 		NET_EPOCH_ENTER(et);
427 		error = ip6_setpktopts(control, &opt, inp->in6p_outputopts,
428 		    so->so_cred, inp->inp_ip_p);
429 		NET_EPOCH_EXIT(et);
430 
431 		if (error != 0) {
432 			goto bad;
433 		}
434 		optp = &opt;
435 	} else
436 		optp = inp->in6p_outputopts;
437 
438 	/*
439 	 * Check and convert scope zone ID into internal form.
440 	 *
441 	 * XXX: we may still need to determine the zone later.
442 	 */
443 	if (!(so->so_state & SS_ISCONNECTED)) {
444 		if (!optp || !optp->ip6po_pktinfo ||
445 		    !optp->ip6po_pktinfo->ipi6_ifindex)
446 			use_defzone = V_ip6_use_defzone;
447 		if (dstsock->sin6_scope_id == 0 && !use_defzone)
448 			scope_ambiguous = 1;
449 		if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
450 			goto bad;
451 	}
452 
453 	/*
454 	 * For an ICMPv6 packet, we should know its type and code to update
455 	 * statistics.
456 	 */
457 	if (inp->inp_ip_p == IPPROTO_ICMPV6) {
458 		struct icmp6_hdr *icmp6;
459 		if (m->m_len < sizeof(struct icmp6_hdr) &&
460 		    (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
461 			error = ENOBUFS;
462 			goto bad;
463 		}
464 		icmp6 = mtod(m, struct icmp6_hdr *);
465 		type = icmp6->icmp6_type;
466 		code = icmp6->icmp6_code;
467 	}
468 
469 	M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
470 	if (m == NULL) {
471 		error = ENOBUFS;
472 		goto bad;
473 	}
474 	ip6 = mtod(m, struct ip6_hdr *);
475 
476 #ifdef ROUTE_MPATH
477 	if (CALC_FLOWID_OUTBOUND) {
478 		uint32_t hash_type, hash_val;
479 
480 		hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
481 		    &dstsock->sin6_addr, 0, 0, inp->inp_ip_p, &hash_type);
482 		inp->inp_flowid = hash_val;
483 		inp->inp_flowtype = hash_type;
484 	}
485 #endif
486 	/*
487 	 * Source address selection.
488 	 */
489 	NET_EPOCH_ENTER(et);
490 	error = in6_selectsrc_socket(dstsock, optp, inp, so->so_cred,
491 	    scope_ambiguous, &in6a, &hlim);
492 	NET_EPOCH_EXIT(et);
493 
494 	if (error)
495 		goto bad;
496 	error = prison_check_ip6(inp->inp_cred, &in6a);
497 	if (error != 0)
498 		goto bad;
499 	ip6->ip6_src = in6a;
500 
501 	ip6->ip6_dst = dstsock->sin6_addr;
502 
503 	/*
504 	 * Fill in the rest of the IPv6 header fields.
505 	 */
506 	ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
507 	    (inp->inp_flow & IPV6_FLOWINFO_MASK);
508 	ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
509 	    (IPV6_VERSION & IPV6_VERSION_MASK);
510 
511 	/*
512 	 * ip6_plen will be filled in ip6_output, so not fill it here.
513 	 */
514 	ip6->ip6_nxt = inp->inp_ip_p;
515 	ip6->ip6_hlim = hlim;
516 
517 	if (inp->inp_ip_p == IPPROTO_ICMPV6 || inp->in6p_cksum != -1) {
518 		struct mbuf *n;
519 		int off;
520 		u_int16_t *p;
521 
522 		/* Compute checksum. */
523 		if (inp->inp_ip_p == IPPROTO_ICMPV6)
524 			off = offsetof(struct icmp6_hdr, icmp6_cksum);
525 		else
526 			off = inp->in6p_cksum;
527 		if (plen < off + 2) {
528 			error = EINVAL;
529 			goto bad;
530 		}
531 		off += sizeof(struct ip6_hdr);
532 
533 		n = m;
534 		while (n && n->m_len <= off) {
535 			off -= n->m_len;
536 			n = n->m_next;
537 		}
538 		if (!n)
539 			goto bad;
540 		p = (u_int16_t *)(mtod(n, caddr_t) + off);
541 		*p = 0;
542 		*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
543 	}
544 
545 	/*
546 	 * Send RA/RS messages to user land for protection, before sending
547 	 * them to rtadvd/rtsol.
548 	 */
549 	if ((send_sendso_input_hook != NULL) &&
550 	    inp->inp_ip_p == IPPROTO_ICMPV6) {
551 		switch (type) {
552 		case ND_ROUTER_ADVERT:
553 		case ND_ROUTER_SOLICIT:
554 			mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
555 				sizeof(unsigned short), M_NOWAIT);
556 			if (mtag == NULL)
557 				goto bad;
558 			m_tag_prepend(m, mtag);
559 		}
560 	}
561 
562 	NET_EPOCH_ENTER(et);
563 	error = ip6_output(m, optp, NULL, 0, inp->in6p_moptions, &oifp, inp);
564 	NET_EPOCH_EXIT(et);
565 	if (inp->inp_ip_p == IPPROTO_ICMPV6) {
566 		if (oifp)
567 			icmp6_ifoutstat_inc(oifp, type, code);
568 		ICMP6STAT_INC(icp6s_outhist[type]);
569 	} else
570 		RIP6STAT_INC(rip6s_opackets);
571 
572 	goto freectl;
573 
574  bad:
575 	if (m)
576 		m_freem(m);
577 
578  freectl:
579 	if (control != NULL) {
580 		ip6_clearpktopts(&opt, -1);
581 		m_freem(control);
582 	}
583 	INP_WUNLOCK(inp);
584 	return (error);
585 
586 release:
587 	if (control != NULL)
588 		m_freem(control);
589 	m_freem(m);
590 	return (error);
591 }
592 
593 /*
594  * Raw IPv6 socket option processing.
595  */
596 int
597 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
598 {
599 	struct inpcb *inp;
600 	int error;
601 
602 	if (sopt->sopt_level == IPPROTO_ICMPV6)
603 		/*
604 		 * XXX: is it better to call icmp6_ctloutput() directly
605 		 * from protosw?
606 		 */
607 		return (icmp6_ctloutput(so, sopt));
608 	else if (sopt->sopt_level != IPPROTO_IPV6) {
609 		if (sopt->sopt_level == SOL_SOCKET &&
610 		    sopt->sopt_name == SO_SETFIB) {
611 			inp = sotoinpcb(so);
612 			INP_WLOCK(inp);
613 			inp->inp_inc.inc_fibnum = so->so_fibnum;
614 			INP_WUNLOCK(inp);
615 			return (0);
616 		}
617 		return (EINVAL);
618 	}
619 
620 	error = 0;
621 
622 	switch (sopt->sopt_dir) {
623 	case SOPT_GET:
624 		switch (sopt->sopt_name) {
625 		case MRT6_INIT:
626 		case MRT6_DONE:
627 		case MRT6_ADD_MIF:
628 		case MRT6_DEL_MIF:
629 		case MRT6_ADD_MFC:
630 		case MRT6_DEL_MFC:
631 		case MRT6_PIM:
632 			error = ip6_mrouter_get ?  ip6_mrouter_get(so, sopt) :
633 			    EOPNOTSUPP;
634 			break;
635 		case IPV6_CHECKSUM:
636 			error = ip6_raw_ctloutput(so, sopt);
637 			break;
638 		default:
639 			error = ip6_ctloutput(so, sopt);
640 			break;
641 		}
642 		break;
643 
644 	case SOPT_SET:
645 		switch (sopt->sopt_name) {
646 		case MRT6_INIT:
647 		case MRT6_DONE:
648 		case MRT6_ADD_MIF:
649 		case MRT6_DEL_MIF:
650 		case MRT6_ADD_MFC:
651 		case MRT6_DEL_MFC:
652 		case MRT6_PIM:
653 			error = ip6_mrouter_set ?  ip6_mrouter_set(so, sopt) :
654 			    EOPNOTSUPP;
655 			break;
656 		case IPV6_CHECKSUM:
657 			error = ip6_raw_ctloutput(so, sopt);
658 			break;
659 		default:
660 			error = ip6_ctloutput(so, sopt);
661 			break;
662 		}
663 		break;
664 	}
665 
666 	return (error);
667 }
668 
669 static int
670 rip6_attach(struct socket *so, int proto, struct thread *td)
671 {
672 	struct inpcb *inp;
673 	struct icmp6_filter *filter;
674 	int error;
675 
676 	inp = sotoinpcb(so);
677 	KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
678 
679 	error = priv_check(td, PRIV_NETINET_RAW);
680 	if (error)
681 		return (error);
682 	if (proto >= IPPROTO_MAX || proto < 0)
683 		return (EPROTONOSUPPORT);
684 	error = soreserve(so, rip_sendspace, rip_recvspace);
685 	if (error)
686 		return (error);
687 	filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
688 	if (filter == NULL)
689 		return (ENOMEM);
690 	error = in_pcballoc(so, &V_ripcbinfo);
691 	if (error) {
692 		free(filter, M_PCB);
693 		return (error);
694 	}
695 	inp = (struct inpcb *)so->so_pcb;
696 	inp->inp_ip_p = proto;
697 	inp->in6p_cksum = -1;
698 	inp->in6p_icmp6filt = filter;
699 	ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
700 	INP_WUNLOCK(inp);
701 	return (0);
702 }
703 
704 static void
705 rip6_detach(struct socket *so)
706 {
707 	struct inpcb *inp;
708 
709 	inp = sotoinpcb(so);
710 	KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
711 
712 	if (so == V_ip6_mrouter && ip6_mrouter_done)
713 		ip6_mrouter_done();
714 	/* xxx: RSVP */
715 	INP_WLOCK(inp);
716 	free(inp->in6p_icmp6filt, M_PCB);
717 	in_pcbdetach(inp);
718 	in_pcbfree(inp);
719 }
720 
721 /* XXXRW: This can't ever be called. */
722 static void
723 rip6_abort(struct socket *so)
724 {
725 	struct inpcb *inp __diagused;
726 
727 	inp = sotoinpcb(so);
728 	KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
729 
730 	soisdisconnected(so);
731 }
732 
733 static void
734 rip6_close(struct socket *so)
735 {
736 	struct inpcb *inp __diagused;
737 
738 	inp = sotoinpcb(so);
739 	KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
740 
741 	soisdisconnected(so);
742 }
743 
744 static int
745 rip6_disconnect(struct socket *so)
746 {
747 	struct inpcb *inp;
748 
749 	inp = sotoinpcb(so);
750 	KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
751 
752 	if ((so->so_state & SS_ISCONNECTED) == 0)
753 		return (ENOTCONN);
754 	inp->in6p_faddr = in6addr_any;
755 	rip6_abort(so);
756 	return (0);
757 }
758 
759 static int
760 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
761 {
762 	struct epoch_tracker et;
763 	struct inpcb *inp;
764 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
765 	struct ifaddr *ifa = NULL;
766 	int error = 0;
767 
768 	inp = sotoinpcb(so);
769 	KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
770 
771 	if (nam->sa_family != AF_INET6)
772 		return (EAFNOSUPPORT);
773 	if (nam->sa_len != sizeof(*addr))
774 		return (EINVAL);
775 	if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
776 		return (error);
777 	if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
778 		return (EADDRNOTAVAIL);
779 	if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
780 		return (error);
781 
782 	NET_EPOCH_ENTER(et);
783 	if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
784 	    (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
785 		NET_EPOCH_EXIT(et);
786 		return (EADDRNOTAVAIL);
787 	}
788 	if (ifa != NULL &&
789 	    ((struct in6_ifaddr *)ifa)->ia6_flags &
790 	    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
791 	     IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
792 		NET_EPOCH_EXIT(et);
793 		return (EADDRNOTAVAIL);
794 	}
795 	NET_EPOCH_EXIT(et);
796 	INP_WLOCK(inp);
797 	INP_INFO_WLOCK(&V_ripcbinfo);
798 	inp->in6p_laddr = addr->sin6_addr;
799 	INP_INFO_WUNLOCK(&V_ripcbinfo);
800 	INP_WUNLOCK(inp);
801 	return (0);
802 }
803 
804 static int
805 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
806 {
807 	struct inpcb *inp;
808 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
809 	struct in6_addr in6a;
810 	struct epoch_tracker et;
811 	int error = 0, scope_ambiguous = 0;
812 
813 	inp = sotoinpcb(so);
814 	KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
815 
816 	if (nam->sa_len != sizeof(*addr))
817 		return (EINVAL);
818 	if (CK_STAILQ_EMPTY(&V_ifnet))
819 		return (EADDRNOTAVAIL);
820 	if (addr->sin6_family != AF_INET6)
821 		return (EAFNOSUPPORT);
822 
823 	/*
824 	 * Application should provide a proper zone ID or the use of default
825 	 * zone IDs should be enabled.  Unfortunately, some applications do
826 	 * not behave as it should, so we need a workaround.  Even if an
827 	 * appropriate ID is not determined, we'll see if we can determine
828 	 * the outgoing interface.  If we can, determine the zone ID based on
829 	 * the interface below.
830 	 */
831 	if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
832 		scope_ambiguous = 1;
833 	if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
834 		return (error);
835 
836 	INP_WLOCK(inp);
837 	INP_INFO_WLOCK(&V_ripcbinfo);
838 	/* Source address selection. XXX: need pcblookup? */
839 	NET_EPOCH_ENTER(et);
840 	error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
841 	    inp, so->so_cred, scope_ambiguous, &in6a, NULL);
842 	NET_EPOCH_EXIT(et);
843 	if (error) {
844 		INP_INFO_WUNLOCK(&V_ripcbinfo);
845 		INP_WUNLOCK(inp);
846 		return (error);
847 	}
848 
849 	inp->in6p_faddr = addr->sin6_addr;
850 	inp->in6p_laddr = in6a;
851 	soisconnected(so);
852 	INP_INFO_WUNLOCK(&V_ripcbinfo);
853 	INP_WUNLOCK(inp);
854 	return (0);
855 }
856 
857 static int
858 rip6_shutdown(struct socket *so)
859 {
860 	struct inpcb *inp;
861 
862 	inp = sotoinpcb(so);
863 	KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
864 
865 	INP_WLOCK(inp);
866 	socantsendmore(so);
867 	INP_WUNLOCK(inp);
868 	return (0);
869 }
870 
871 struct protosw rip6_protosw = {
872 	.pr_type =		SOCK_RAW,
873 	.pr_flags =		PR_ATOMIC|PR_ADDR,
874 	.pr_ctloutput =		rip6_ctloutput,
875 	.pr_abort =		rip6_abort,
876 	.pr_attach =		rip6_attach,
877 	.pr_bind =		rip6_bind,
878 	.pr_connect =		rip6_connect,
879 	.pr_control =		in6_control,
880 	.pr_detach =		rip6_detach,
881 	.pr_disconnect =	rip6_disconnect,
882 	.pr_peeraddr =		in6_getpeeraddr,
883 	.pr_send =		rip6_send,
884 	.pr_shutdown =		rip6_shutdown,
885 	.pr_sockaddr =		in6_getsockaddr,
886 	.pr_close =		rip6_close
887 };
888