xref: /dragonfly/sys/netinet6/raw_ip6.c (revision be09fc23)
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  * $FreeBSD: src/sys/netinet6/raw_ip6.c,v 1.7.2.7 2003/01/24 05:11:35 sam Exp $
30  */
31 
32 /*
33  * Copyright (c) 1982, 1986, 1988, 1993
34  *	The Regents of the University of California.  All rights reserved.
35  *
36  * Redistribution and use in source and binary forms, with or without
37  * modification, are permitted provided that the following conditions
38  * are met:
39  * 1. Redistributions of source code must retain the above copyright
40  *    notice, this list of conditions and the following disclaimer.
41  * 2. Redistributions in binary form must reproduce the above copyright
42  *    notice, this list of conditions and the following disclaimer in the
43  *    documentation and/or other materials provided with the distribution.
44  * 3. Neither the name of the University nor the names of its contributors
45  *    may be used to endorse or promote products derived from this software
46  *    without specific prior written permission.
47  *
48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58  * SUCH DAMAGE.
59  *
60  *	@(#)raw_ip.c	8.2 (Berkeley) 1/4/94
61  */
62 
63 #include "opt_ipsec.h"
64 #include "opt_inet6.h"
65 
66 #include <sys/param.h>
67 #include <sys/malloc.h>
68 #include <sys/proc.h>
69 #include <sys/priv.h>
70 #include <sys/mbuf.h>
71 #include <sys/socket.h>
72 #include <sys/jail.h>
73 #include <sys/protosw.h>
74 #include <sys/socketvar.h>
75 #include <sys/errno.h>
76 #include <sys/systm.h>
77 
78 #include <sys/thread2.h>
79 #include <sys/socketvar2.h>
80 #include <sys/msgport2.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/ip6.h>
90 #include <netinet6/ip6_var.h>
91 #include <netinet6/ip6_mroute.h>
92 #include <netinet/icmp6.h>
93 #include <netinet/in_pcb.h>
94 #include <netinet6/in6_pcb.h>
95 #include <netinet6/nd6.h>
96 #include <netinet6/ip6protosw.h>
97 #ifdef ENABLE_DEFAULT_SCOPE
98 #include <netinet6/scope6_var.h>
99 #endif
100 #include <netinet6/raw_ip6.h>
101 
102 #ifdef IPSEC
103 #include <netinet6/ipsec.h>
104 #include <netinet6/ipsec6.h>
105 #endif /*IPSEC*/
106 
107 #ifdef FAST_IPSEC
108 #include <netproto/ipsec/ipsec.h>
109 #include <netproto/ipsec/ipsec6.h>
110 #endif /* FAST_IPSEC */
111 
112 #include <machine/stdarg.h>
113 
114 #define	satosin6(sa)	((struct sockaddr_in6 *)(sa))
115 #define	ifatoia6(ifa)	((struct in6_ifaddr *)(ifa))
116 
117 /*
118  * Raw interface to IP6 protocol.
119  */
120 
121 extern struct	inpcbinfo ripcbinfo;
122 extern u_long	rip_sendspace;
123 extern u_long	rip_recvspace;
124 
125 struct rip6stat rip6stat;
126 
127 /*
128  * Setup generic address and protocol structures
129  * for raw_input routine, then pass them along with
130  * mbuf chain.
131  */
132 int
133 rip6_input(struct mbuf **mp, int *offp, int proto)
134 {
135 	struct mbuf *m = *mp;
136 	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
137 	struct inpcb *in6p;
138 	struct inpcb *last = NULL;
139 	struct mbuf *opts = NULL;
140 	struct sockaddr_in6 rip6src;
141 
142 	rip6stat.rip6s_ipackets++;
143 
144 	if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
145 		/* XXX send icmp6 host/port unreach? */
146 		m_freem(m);
147 		return IPPROTO_DONE;
148 	}
149 
150 	init_sin6(&rip6src, m); /* general init */
151 
152 	LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list) {
153 		if (in6p->in6p_flags & INP_PLACEMARKER)
154 			continue;
155 		if (!INP_ISIPV6(in6p))
156 			continue;
157 		if (in6p->in6p_ip6_nxt &&
158 		    in6p->in6p_ip6_nxt != proto)
159 			continue;
160 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
161 		    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
162 			continue;
163 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
164 		    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
165 			continue;
166 		if (in6p->in6p_cksum != -1) {
167 			rip6stat.rip6s_isum++;
168 			if (in6_cksum(m, ip6->ip6_nxt, *offp,
169 			    m->m_pkthdr.len - *offp)) {
170 				rip6stat.rip6s_badsum++;
171 				continue;
172 			}
173 		}
174 		if (last) {
175 			struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
176 
177 #ifdef IPSEC
178 			/*
179 			 * Check AH/ESP integrity.
180 			 */
181 			if (n && ipsec6_in_reject_so(n, last->inp_socket)) {
182 				m_freem(n);
183 				ipsec6stat.in_polvio++;
184 				/* do not inject data into pcb */
185 			} else
186 #endif /*IPSEC*/
187 #ifdef FAST_IPSEC
188 			/*
189 			 * Check AH/ESP integrity.
190 			 */
191 			if (n && ipsec6_in_reject(n, last)) {
192 				m_freem(n);
193 				/* do not inject data into pcb */
194 			} else
195 #endif /*FAST_IPSEC*/
196 			if (n) {
197 				struct socket *so;
198 
199 				so = last->in6p_socket;
200 				if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
201 				    (so->so_options & SO_TIMESTAMP)) {
202 					ip6_savecontrol(last, &opts, ip6, n);
203 				}
204 				/* strip intermediate headers */
205 				m_adj(n, *offp);
206 				lwkt_gettoken(&so->so_rcv.ssb_token);
207 				if (ssb_appendaddr(&so->so_rcv,
208 						(struct sockaddr *)&rip6src,
209 						 n, opts) == 0) {
210 					m_freem(n);
211 					if (opts)
212 						m_freem(opts);
213 					rip6stat.rip6s_fullsock++;
214 				} else {
215 					sorwakeup(so);
216 				}
217 				lwkt_reltoken(&so->so_rcv.ssb_token);
218 				opts = NULL;
219 			}
220 		}
221 		last = in6p;
222 	}
223 #ifdef IPSEC
224 	/*
225 	 * Check AH/ESP integrity.
226 	 */
227 	if (last && ipsec6_in_reject_so(m, last->inp_socket)) {
228 		m_freem(m);
229 		ipsec6stat.in_polvio++;
230 		ip6stat.ip6s_delivered--;
231 		/* do not inject data into pcb */
232 	} else
233 #endif /*IPSEC*/
234 #ifdef FAST_IPSEC
235 	/*
236 	 * Check AH/ESP integrity.
237 	 */
238 	if (last && ipsec6_in_reject(m, last)) {
239 		m_freem(m);
240 		ip6stat.ip6s_delivered--;
241 		/* do not inject data into pcb */
242 	} else
243 #endif /*FAST_IPSEC*/
244 	if (last) {
245 		struct socket *so;
246 
247 		so = last->in6p_socket;
248 		if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
249 		    (so->so_options & SO_TIMESTAMP)) {
250 			ip6_savecontrol(last, &opts, ip6, m);
251 		}
252 		/* strip intermediate headers */
253 		m_adj(m, *offp);
254 		lwkt_gettoken(&so->so_rcv.ssb_token);
255 		if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&rip6src,
256 				   m, opts) == 0) {
257 			m_freem(m);
258 			if (opts)
259 				m_freem(opts);
260 			rip6stat.rip6s_fullsock++;
261 		} else {
262 			sorwakeup(so);
263 		}
264 		lwkt_reltoken(&so->so_rcv.ssb_token);
265 	} else {
266 		rip6stat.rip6s_nosock++;
267 		if (m->m_flags & M_MCAST)
268 			rip6stat.rip6s_nosockmcast++;
269 		if (proto == IPPROTO_NONE)
270 			m_freem(m);
271 		else {
272 			char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
273 			icmp6_error(m, ICMP6_PARAM_PROB,
274 				    ICMP6_PARAMPROB_NEXTHEADER,
275 				    prvnxtp - mtod(m, char *));
276 		}
277 		ip6stat.ip6s_delivered--;
278 	}
279 	return IPPROTO_DONE;
280 }
281 
282 void
283 rip6_ctlinput(netmsg_t msg)
284 {
285 	int cmd = msg->ctlinput.nm_cmd;
286 	struct sockaddr *sa = msg->ctlinput.nm_arg;
287 	void *d = msg->ctlinput.nm_extra;
288 	struct ip6ctlparam *ip6cp = NULL;
289 	const struct sockaddr_in6 *sa6_src = NULL;
290 	inp_notify_t notify = in6_rtchange;
291 
292 	if (sa->sa_family != AF_INET6 ||
293 	    sa->sa_len != sizeof(struct sockaddr_in6))
294 		goto out;
295 
296 	if ((unsigned)cmd >= PRC_NCMDS)
297 		goto out;
298 	if (PRC_IS_REDIRECT(cmd))
299 		notify = in6_rtchange, d = NULL;
300 	else if (cmd == PRC_HOSTDEAD)
301 		d = NULL;
302 	else if (inet6ctlerrmap[cmd] == 0)
303 		goto out;
304 
305 	/* if the parameter is from icmp6, decode it. */
306 	if (d != NULL) {
307 		ip6cp = (struct ip6ctlparam *)d;
308 		sa6_src = ip6cp->ip6c_src;
309 	} else {
310 		sa6_src = &sa6_any;
311 	}
312 
313 	in6_pcbnotify(&ripcbinfo, sa, 0,
314 		      (const struct sockaddr *)sa6_src, 0, cmd, 0, notify);
315 out:
316 	lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
317 }
318 
319 /*
320  * Generate IPv6 header and pass packet to ip6_output.
321  * Tack on options user may have setup with control call.
322  */
323 int
324 rip6_output(struct mbuf *m, struct socket *so, ...)
325 {
326 	struct sockaddr_in6 *dstsock;
327 	struct mbuf *control;
328 	struct in6_addr *dst;
329 	struct ip6_hdr *ip6;
330 	struct inpcb *in6p;
331 	u_int	plen = m->m_pkthdr.len;
332 	int error = 0;
333 	struct ip6_pktopts opt, *optp = NULL;
334 	struct ifnet *oifp = NULL;
335 	int type = 0, code = 0;		/* for ICMPv6 output statistics only */
336 	int priv = 0;
337 	__va_list ap;
338 
339 	__va_start(ap, so);
340 	dstsock = __va_arg(ap, struct sockaddr_in6 *);
341 	control = __va_arg(ap, struct mbuf *);
342 	__va_end(ap);
343 
344 	if (IN6_IS_ADDR_V4MAPPED(&dstsock->sin6_addr)) {
345 		error = EADDRNOTAVAIL;
346 		goto bad;
347 	}
348 
349 	in6p = so->so_pcb;
350 
351 	priv = 0;
352 	if (so->so_cred->cr_uid == 0)
353 		priv = 1;
354 	dst = &dstsock->sin6_addr;
355 	if (control) {
356 		if ((error = ip6_setpktoptions(control, &opt,
357 		    in6p->in6p_outputopts,
358 		    so->so_proto->pr_protocol, priv)) != 0)
359 			goto bad;
360 		optp = &opt;
361 	} else
362 		optp = in6p->in6p_outputopts;
363 
364 	/*
365 	 * For an ICMPv6 packet, we should know its type and code
366 	 * to update statistics.
367 	 */
368 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
369 		struct icmp6_hdr *icmp6;
370 		if (m->m_len < sizeof(struct icmp6_hdr) &&
371 		    (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
372 			error = ENOBUFS;
373 			goto bad;
374 		}
375 		icmp6 = mtod(m, struct icmp6_hdr *);
376 		type = icmp6->icmp6_type;
377 		code = icmp6->icmp6_code;
378 	}
379 
380 	M_PREPEND(m, sizeof(*ip6), M_WAITOK);
381 	ip6 = mtod(m, struct ip6_hdr *);
382 
383 	/*
384 	 * Next header might not be ICMP6 but use its pseudo header anyway.
385 	 */
386 	ip6->ip6_dst = *dst;
387 
388 	/*
389 	 * If the scope of the destination is link-local, embed the interface
390 	 * index in the address.
391 	 *
392 	 * XXX advanced-api value overrides sin6_scope_id
393 	 */
394 	if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
395 		struct in6_pktinfo *pi;
396 
397 		/*
398 		 * XXX Boundary check is assumed to be already done in
399 		 * ip6_setpktoptions().
400 		 */
401 		if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
402 			ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
403 			oifp = ifindex2ifnet[pi->ipi6_ifindex];
404 		} else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
405 			 in6p->in6p_moptions &&
406 			 in6p->in6p_moptions->im6o_multicast_ifp) {
407 			oifp = in6p->in6p_moptions->im6o_multicast_ifp;
408 			ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
409 		} else if (dstsock->sin6_scope_id) {
410 			/* boundary check */
411 			if (dstsock->sin6_scope_id < 0
412 			 || if_index < dstsock->sin6_scope_id) {
413 				error = ENXIO;  /* XXX EINVAL? */
414 				goto bad;
415 			}
416 			ip6->ip6_dst.s6_addr16[1]
417 				= htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
418 		}
419 	}
420 
421 	/*
422 	 * Source address selection.
423 	 */
424 	{
425 		struct in6_addr *in6a;
426 
427 		if ((in6a = in6_selectsrc(dstsock, optp,
428 					  in6p->in6p_moptions,
429 					  &in6p->in6p_route,
430 					  &in6p->in6p_laddr,
431 					  &error, NULL)) == NULL) {
432 			if (error == 0)
433 				error = EADDRNOTAVAIL;
434 			goto bad;
435 		}
436 		ip6->ip6_src = *in6a;
437 		if (in6p->in6p_route.ro_rt)
438 			oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];
439 	}
440 	ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
441 		(in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK);
442 	ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
443 		(IPV6_VERSION & IPV6_VERSION_MASK);
444 	/* ip6_plen will be filled in ip6_output, so not fill it here. */
445 	ip6->ip6_nxt = in6p->in6p_ip6_nxt;
446 	ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
447 
448 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
449 	    in6p->in6p_cksum != -1) {
450 		struct mbuf *n;
451 		int off;
452 		u_int16_t *p;
453 
454 		/* compute checksum */
455 		if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
456 			off = offsetof(struct icmp6_hdr, icmp6_cksum);
457 		else
458 			off = in6p->in6p_cksum;
459 		if (plen < off + 1) {
460 			error = EINVAL;
461 			goto bad;
462 		}
463 		off += sizeof(struct ip6_hdr);
464 
465 		n = m;
466 		while (n && n->m_len <= off) {
467 			off -= n->m_len;
468 			n = n->m_next;
469 		}
470 		if (!n)
471 			goto bad;
472 		p = (u_int16_t *)(mtod(n, caddr_t) + off);
473 		*p = 0;
474 		*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
475 	}
476 
477 	error = ip6_output(m, optp, &in6p->in6p_route, 0,
478 			   in6p->in6p_moptions, &oifp, in6p);
479 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
480 		if (oifp)
481 			icmp6_ifoutstat_inc(oifp, type, code);
482 		icmp6stat.icp6s_outhist[type]++;
483 	} else
484 		rip6stat.rip6s_opackets++;
485 
486 	goto freectl;
487 
488 bad:
489 	if (m)
490 		m_freem(m);
491 
492 freectl:
493 	if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
494 		RTFREE(optp->ip6po_route.ro_rt);
495 	if (control) {
496 		if (optp == &opt)
497 			ip6_clearpktopts(optp, -1);
498 		m_freem(control);
499 	}
500 	return (error);
501 }
502 
503 /*
504  * Raw IPv6 socket option processing.
505  */
506 void
507 rip6_ctloutput(netmsg_t msg)
508 {
509 	struct socket *so = msg->ctloutput.base.nm_so;
510 	struct sockopt *sopt = msg->ctloutput.nm_sopt;
511 	int error;
512 
513 	if (sopt->sopt_level == IPPROTO_ICMPV6) {
514 		/*
515 		 * XXX: is it better to call icmp6_ctloutput() directly
516 		 * from protosw?
517 		 */
518 		icmp6_ctloutput(msg);
519 		/* msg invalid now */
520 		return;
521 	}
522 	if (sopt->sopt_level != IPPROTO_IPV6) {
523 		error = EINVAL;
524 		goto out;
525 	}
526 
527 	error = 0;
528 
529 	switch (sopt->sopt_dir) {
530 	case SOPT_GET:
531 		switch (sopt->sopt_name) {
532 		case MRT6_INIT:
533 		case MRT6_DONE:
534 		case MRT6_ADD_MIF:
535 		case MRT6_DEL_MIF:
536 		case MRT6_ADD_MFC:
537 		case MRT6_DEL_MFC:
538 		case MRT6_PIM:
539 			error = ip6_mrouter_get(so, sopt);
540 			break;
541 		case IPV6_CHECKSUM:
542 			error = ip6_raw_ctloutput(so, sopt);
543 			break;
544 		default:
545 			error = ip6_ctloutput(so, sopt);
546 			break;
547 		}
548 		break;
549 
550 	case SOPT_SET:
551 		switch (sopt->sopt_name) {
552 		case MRT6_INIT:
553 		case MRT6_DONE:
554 		case MRT6_ADD_MIF:
555 		case MRT6_DEL_MIF:
556 		case MRT6_ADD_MFC:
557 		case MRT6_DEL_MFC:
558 		case MRT6_PIM:
559 			error = ip6_mrouter_set(so, sopt);
560 			break;
561 		case IPV6_CHECKSUM:
562 			error = ip6_raw_ctloutput(so, sopt);
563 			break;
564 		default:
565 			error = ip6_ctloutput(so, sopt);
566 			break;
567 		}
568 		break;
569 	}
570 out:
571 	lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
572 }
573 
574 static void
575 rip6_attach(netmsg_t msg)
576 {
577 	struct socket *so = msg->attach.base.nm_so;
578 	int proto = msg->attach.nm_proto;
579 	struct pru_attach_info *ai = msg->attach.nm_ai;
580 	struct inpcb *inp;
581 	int error;
582 
583 	inp = so->so_pcb;
584 	if (inp)
585 		panic("rip6_attach");
586 	error = priv_check_cred(ai->p_ucred, PRIV_NETINET_RAW, NULL_CRED_OKAY);
587 	if (error)
588 		goto out;
589 
590 	error = soreserve(so, rip_sendspace, rip_recvspace, ai->sb_rlimit);
591 	if (error)
592 		goto out;
593 	crit_enter();
594 	error = in_pcballoc(so, &ripcbinfo);
595 	crit_exit();
596 	if (error)
597 		goto out;
598 	inp = (struct inpcb *)so->so_pcb;
599 	inp->in6p_ip6_nxt = (long)proto;
600 	inp->in6p_hops = -1;	/* use kernel default */
601 	inp->in6p_cksum = -1;
602 	inp->in6p_icmp6filt = kmalloc(sizeof(struct icmp6_filter), M_PCB,
603 				      M_NOWAIT);
604 	if (inp->in6p_icmp6filt != NULL)
605 		ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
606 	error = 0;
607 out:
608 	lwkt_replymsg(&msg->attach.base.lmsg, error);
609 }
610 
611 static void
612 rip6_detach(netmsg_t msg)
613 {
614 	struct socket *so = msg->detach.base.nm_so;
615 	struct inpcb *inp;
616 
617 	inp = so->so_pcb;
618 	if (inp == NULL)
619 		panic("rip6_detach");
620 	/* xxx: RSVP */
621 	if (so == ip6_mrouter)
622 		ip6_mrouter_done();
623 	if (inp->in6p_icmp6filt) {
624 		kfree(inp->in6p_icmp6filt, M_PCB);
625 		inp->in6p_icmp6filt = NULL;
626 	}
627 	in6_pcbdetach(inp);
628 	lwkt_replymsg(&msg->detach.base.lmsg, 0);
629 }
630 
631 /*
632  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
633  *	 will sofree() it when we return.
634  */
635 static void
636 rip6_abort(netmsg_t msg)
637 {
638 	soisdisconnected(msg->abort.base.nm_so);
639 	rip6_detach(msg);
640 	/* msg invalid now */
641 }
642 
643 static void
644 rip6_disconnect(netmsg_t msg)
645 {
646 	struct socket *so = msg->disconnect.base.nm_so;
647 	struct inpcb *inp = so->so_pcb;
648 
649 	if (so->so_state & SS_ISCONNECTED) {
650 		inp->in6p_faddr = kin6addr_any;
651 		soreference(so);
652 		rip6_abort(msg);
653 		/* msg invalid now */
654 		sofree(so);
655 		return;
656 	}
657 	lwkt_replymsg(&msg->disconnect.base.lmsg, ENOTCONN);
658 }
659 
660 static void
661 rip6_bind(netmsg_t msg)
662 {
663 	struct socket *so = msg->bind.base.nm_so;
664 	struct sockaddr *nam = msg->bind.nm_nam;
665 	struct inpcb *inp = so->so_pcb;
666 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
667 	struct ifaddr *ia = NULL;
668 	int error;
669 
670 	if (nam->sa_len != sizeof(*addr)) {
671 		error = EINVAL;
672 		goto out;
673 	}
674 
675 	if (ifnet_array_isempty() || addr->sin6_family != AF_INET6) {
676 		error = EADDRNOTAVAIL;
677 		goto out;
678 	}
679 	if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) {
680 		error = EADDRNOTAVAIL;
681 		goto out;
682 	}
683 #ifdef ENABLE_DEFAULT_SCOPE
684 	if (addr->sin6_scope_id == 0) {	/* not change if specified  */
685 		addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
686 	}
687 #endif
688 	if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
689 	    (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
690 		error = EADDRNOTAVAIL;
691 		goto out;
692 	}
693 	if (ia &&
694 	    ((struct in6_ifaddr *)ia)->ia6_flags &
695 	    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
696 	     IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
697 		error = EADDRNOTAVAIL;
698 		goto out;
699 	}
700 	inp->in6p_laddr = addr->sin6_addr;
701 	error = 0;
702 out:
703 	lwkt_replymsg(&msg->bind.base.lmsg, error);
704 }
705 
706 static void
707 rip6_connect(netmsg_t msg)
708 {
709 	struct socket *so = msg->connect.base.nm_so;
710 	struct sockaddr *nam = msg->connect.nm_nam;
711 	struct inpcb *inp = so->so_pcb;
712 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
713 	struct in6_addr *in6a = NULL;
714 	int error = 0;
715 #ifdef ENABLE_DEFAULT_SCOPE
716 	struct sockaddr_in6 tmp;
717 #endif
718 
719 	if (nam->sa_len != sizeof(*addr)) {
720 		error = EINVAL;
721 		goto out;
722 	}
723 	if (ifnet_array_isempty()) {
724 		error = EADDRNOTAVAIL;
725 		goto out;
726 	}
727 	if (addr->sin6_family != AF_INET6) {
728 		error = EAFNOSUPPORT;
729 		goto out;
730 	}
731 	if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) {
732 		error = EADDRNOTAVAIL;
733 		goto out;
734 	}
735 #ifdef ENABLE_DEFAULT_SCOPE
736 	if (addr->sin6_scope_id == 0) {	/* not change if specified  */
737 		/* avoid overwrites */
738 		tmp = *addr;
739 		addr = &tmp;
740 		addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
741 	}
742 #endif
743 	/* Source address selection. XXX: need pcblookup? */
744 	in6a = in6_selectsrc(addr, inp->in6p_outputopts,
745 			     inp->in6p_moptions, &inp->in6p_route,
746 			     &inp->in6p_laddr, &error, NULL);
747 	if (in6a == NULL) {
748 		if (error == 0)
749 			error = EADDRNOTAVAIL;
750 	} else {
751 		inp->in6p_laddr = *in6a;
752 		inp->in6p_faddr = addr->sin6_addr;
753 		soisconnected(so);
754 		error = 0;
755 	}
756 out:
757 	lwkt_replymsg(&msg->connect.base.lmsg, error);
758 }
759 
760 static void
761 rip6_shutdown(netmsg_t msg)
762 {
763 	socantsendmore(msg->shutdown.base.nm_so);
764 	lwkt_replymsg(&msg->shutdown.base.lmsg, 0);
765 }
766 
767 static void
768 rip6_send(netmsg_t msg)
769 {
770 	struct socket *so = msg->send.base.nm_so;
771 	struct mbuf *m = msg->send.nm_m;
772 	struct sockaddr *nam = msg->send.nm_addr;
773 	struct mbuf *control = msg->send.nm_control;
774 	struct inpcb *inp = so->so_pcb;
775 	struct sockaddr_in6 tmp;
776 	struct sockaddr_in6 *dst;
777 	int error;
778 
779 	/* always copy sockaddr to avoid overwrites */
780 	if (so->so_state & SS_ISCONNECTED) {
781 		if (nam) {
782 			m_freem(m);
783 			error = EISCONN;
784 			goto out;
785 		}
786 		/* XXX */
787 		bzero(&tmp, sizeof(tmp));
788 		tmp.sin6_family = AF_INET6;
789 		tmp.sin6_len = sizeof(struct sockaddr_in6);
790 		bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
791 		      sizeof(struct in6_addr));
792 		dst = &tmp;
793 	} else {
794 		if (nam == NULL) {
795 			m_freem(m);
796 			error = ENOTCONN;
797 			goto out;
798 		}
799 		tmp = *(struct sockaddr_in6 *)nam;
800 		dst = &tmp;
801 	}
802 #ifdef ENABLE_DEFAULT_SCOPE
803 	if (dst->sin6_scope_id == 0) {	/* not change if specified  */
804 		dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
805 	}
806 #endif
807 	error = rip6_output(m, so, dst, control);
808 out:
809 	lwkt_replymsg(&msg->send.base.lmsg, error);
810 }
811 
812 struct pr_usrreqs rip6_usrreqs = {
813 	.pru_abort = rip6_abort,
814 	.pru_accept = pr_generic_notsupp,
815 	.pru_attach = rip6_attach,
816 	.pru_bind = rip6_bind,
817 	.pru_connect = rip6_connect,
818 	.pru_connect2 = pr_generic_notsupp,
819 	.pru_control = in6_control_dispatch,
820 	.pru_detach = rip6_detach,
821 	.pru_disconnect = rip6_disconnect,
822 	.pru_listen = pr_generic_notsupp,
823 	.pru_peeraddr = in6_setpeeraddr_dispatch,
824 	.pru_rcvd = pr_generic_notsupp,
825 	.pru_rcvoob = pr_generic_notsupp,
826 	.pru_send = rip6_send,
827 	.pru_sense = pru_sense_null,
828 	.pru_shutdown = rip6_shutdown,
829 	.pru_sockaddr = in6_setsockaddr_dispatch,
830 	.pru_sosend = sosend,
831 	.pru_soreceive = soreceive
832 };
833