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raw_ip6.c revision 1.26 
      1 /*	$NetBSD: raw_ip6.c,v 1.26 2001/01/24 09:04:17 itojun Exp $	*/
      2 /*	$KAME: raw_ip6.c,v 1.56 2001/01/11 11:01:23 sumikawa 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, 1988, 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. All advertising materials mentioning features or use of this software
     46  *    must display the following acknowledgement:
     47  *	This product includes software developed by the University of
     48  *	California, Berkeley and its contributors.
     49  * 4. Neither the name of the University nor the names of its contributors
     50  *    may be used to endorse or promote products derived from this software
     51  *    without specific prior written permission.
     52  *
     53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     63  * SUCH DAMAGE.
     64  *
     65  *	@(#)raw_ip.c	8.2 (Berkeley) 1/4/94
     66  */
     67 
     68 #include "opt_ipsec.h"
     69 
     70 #include <sys/param.h>
     71 #include <sys/malloc.h>
     72 #include <sys/mbuf.h>
     73 #include <sys/socket.h>
     74 #include <sys/protosw.h>
     75 #include <sys/socketvar.h>
     76 #include <sys/errno.h>
     77 #include <sys/systm.h>
     78 #include <sys/proc.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/ip6.h>
     87 #include <netinet6/ip6_var.h>
     88 #include <netinet6/ip6_mroute.h>
     89 #include <netinet/icmp6.h>
     90 #include <netinet6/in6_pcb.h>
     91 #include <netinet6/nd6.h>
     92 #include <netinet6/ip6protosw.h>
     93 #ifdef ENABLE_DEFAULT_SCOPE
     94 #include <netinet6/scope6_var.h>
     95 #endif
     96 
     97 #ifdef IPSEC
     98 #include <netinet6/ipsec.h>
     99 #endif /*IPSEC*/
    100 
    101 #include <machine/stdarg.h>
    102 
    103 #include "faith.h"
    104 
    105 struct	in6pcb rawin6pcb;
    106 #define ifatoia6(ifa)	((struct in6_ifaddr *)(ifa))
    107 
    108 /*
    109  * Raw interface to IP6 protocol.
    110  */
    111 
    112 /*
    113  * Initialize raw connection block queue.
    114  */
    115 void
    116 rip6_init()
    117 {
    118 	rawin6pcb.in6p_next = rawin6pcb.in6p_prev = &rawin6pcb;
    119 }
    120 
    121 /*
    122  * Setup generic address and protocol structures
    123  * for raw_input routine, then pass them along with
    124  * mbuf chain.
    125  */
    126 int
    127 rip6_input(mp, offp, proto)
    128 	struct	mbuf **mp;
    129 	int	*offp, proto;
    130 {
    131 	struct mbuf *m = *mp;
    132 	register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
    133 	register struct in6pcb *in6p;
    134 	struct in6pcb *last = NULL;
    135 	struct sockaddr_in6 rip6src;
    136 	struct mbuf *opts = NULL;
    137 
    138 #if defined(NFAITH) && 0 < NFAITH
    139 	if (m->m_pkthdr.rcvif) {
    140 		if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
    141 			/* send icmp6 host unreach? */
    142 			m_freem(m);
    143 			return IPPROTO_DONE;
    144 		}
    145 	}
    146 #endif
    147 
    148 	/* Be proactive about malicious use of IPv4 mapped address */
    149 	if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
    150 	    IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
    151 		/* XXX stat */
    152 		m_freem(m);
    153 		return IPPROTO_DONE;
    154 	}
    155 
    156 	bzero(&rip6src, sizeof(rip6src));
    157 	rip6src.sin6_len = sizeof(struct sockaddr_in6);
    158 	rip6src.sin6_family = AF_INET6;
    159 #if 0 /*XXX inbound flowlabel */
    160 	rip6src.sin6_flowinfo = ip6->ip6_flow & IPV6_FLOWINFO_MASK;
    161 #endif
    162 	/* KAME hack: recover scopeid */
    163 	(void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
    164 
    165 	for (in6p = rawin6pcb.in6p_next;
    166 	     in6p != &rawin6pcb; in6p = in6p->in6p_next) {
    167 		if (in6p->in6p_ip6.ip6_nxt &&
    168 		    in6p->in6p_ip6.ip6_nxt != proto)
    169 			continue;
    170 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
    171 		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
    172 			continue;
    173 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
    174 		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
    175 			continue;
    176 		if (in6p->in6p_cksum != -1
    177 		 && in6_cksum(m, ip6->ip6_nxt, *offp, m->m_pkthdr.len - *offp))
    178 		{
    179 			/* XXX bark something */
    180 			continue;
    181 		}
    182 		if (last) {
    183 			struct	mbuf *n;
    184 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
    185 				if (last->in6p_flags & IN6P_CONTROLOPTS)
    186 					ip6_savecontrol(last, &opts, ip6, n);
    187 				/* strip intermediate headers */
    188 				m_adj(n, *offp);
    189 				if (sbappendaddr(&last->in6p_socket->so_rcv,
    190 						(struct sockaddr *)&rip6src,
    191 						 n, opts) == 0) {
    192 					/* should notify about lost packet */
    193 					m_freem(n);
    194 					if (opts)
    195 						m_freem(opts);
    196 				} else
    197 					sorwakeup(last->in6p_socket);
    198 				opts = NULL;
    199 			}
    200 		}
    201 		last = in6p;
    202 	}
    203 	if (last) {
    204 		if (last->in6p_flags & IN6P_CONTROLOPTS)
    205 			ip6_savecontrol(last, &opts, ip6, m);
    206 		/* strip intermediate headers */
    207 		m_adj(m, *offp);
    208 		if (sbappendaddr(&last->in6p_socket->so_rcv,
    209 				(struct sockaddr *)&rip6src, m, opts) == 0) {
    210 			m_freem(m);
    211 			if (opts)
    212 				m_freem(opts);
    213 		} else
    214 			sorwakeup(last->in6p_socket);
    215 	} else {
    216 		if (proto == IPPROTO_NONE)
    217 			m_freem(m);
    218 		else {
    219 			char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
    220 			icmp6_error(m, ICMP6_PARAM_PROB,
    221 				    ICMP6_PARAMPROB_NEXTHEADER,
    222 				    prvnxtp - mtod(m, char *));
    223 		}
    224 		ip6stat.ip6s_delivered--;
    225 	}
    226 	return IPPROTO_DONE;
    227 }
    228 
    229 void
    230 rip6_ctlinput(cmd, sa, d)
    231 	int cmd;
    232 	struct sockaddr *sa;
    233 	void *d;
    234 {
    235 	struct sockaddr_in6 sa6;
    236 	register struct ip6_hdr *ip6;
    237 	struct mbuf *m;
    238 	int off;
    239 	void (*notify) __P((struct in6pcb *, int)) = in6_rtchange;
    240 
    241 	if (sa->sa_family != AF_INET6 ||
    242 	    sa->sa_len != sizeof(struct sockaddr_in6))
    243 		return;
    244 
    245 	if ((unsigned)cmd >= PRC_NCMDS)
    246 		return;
    247 	if (PRC_IS_REDIRECT(cmd))
    248 		notify = in6_rtchange, d = NULL;
    249 	else if (cmd == PRC_HOSTDEAD)
    250 		d = NULL;
    251 	else if (inet6ctlerrmap[cmd] == 0)
    252 		return;
    253 
    254 	/* if the parameter is from icmp6, decode it. */
    255 	if (d != NULL) {
    256 		struct ip6ctlparam *ip6cp = (struct ip6ctlparam *)d;
    257 		m = ip6cp->ip6c_m;
    258 		ip6 = ip6cp->ip6c_ip6;
    259 		off = ip6cp->ip6c_off;
    260 	} else {
    261 		m = NULL;
    262 		ip6 = NULL;
    263 	}
    264 
    265 	/* translate addresses into internal form */
    266 	sa6 = *(struct sockaddr_in6 *)sa;
    267 	if (IN6_IS_ADDR_LINKLOCAL(&sa6.sin6_addr) && m && m->m_pkthdr.rcvif)
    268 		sa6.sin6_addr.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
    269 
    270 	if (ip6) {
    271 		/*
    272 		 * XXX: We assume that when IPV6 is non NULL,
    273 		 * M and OFF are valid.
    274 		 */
    275 		struct in6_addr s;
    276 
    277 		/* translate addresses into internal form */
    278 		bcopy(&ip6->ip6_src, &s, sizeof(s));
    279 		if (IN6_IS_ADDR_LINKLOCAL(&s))
    280 			s.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
    281 
    282 		(void) in6_pcbnotify(&rawin6pcb, (struct sockaddr *)&sa6,
    283 					0, &s, 0, cmd, notify);
    284 	} else {
    285 		(void) in6_pcbnotify(&rawin6pcb, (struct sockaddr *)&sa6, 0,
    286 					&zeroin6_addr, 0, cmd, notify);
    287 	}
    288 }
    289 
    290 /*
    291  * Generate IPv6 header and pass packet to ip6_output.
    292  * Tack on options user may have setup with control call.
    293  */
    294 int
    295 #if __STDC__
    296 rip6_output(struct mbuf *m, ...)
    297 #else
    298 rip6_output(m, va_alist)
    299 	struct mbuf *m;
    300 	va_dcl
    301 #endif
    302 {
    303 	struct socket *so;
    304 	struct sockaddr_in6 *dstsock;
    305 	struct mbuf *control;
    306 	struct in6_addr *dst;
    307 	struct ip6_hdr *ip6;
    308 	struct in6pcb *in6p;
    309 	u_int	plen = m->m_pkthdr.len;
    310 	int error = 0;
    311 	struct ip6_pktopts opt, *optp = NULL, *origoptp;
    312 	struct ifnet *oifp = NULL;
    313 	int type, code;		/* for ICMPv6 output statistics only */
    314 	int priv = 0;
    315 	va_list ap;
    316 
    317 	va_start(ap, m);
    318 	so = va_arg(ap, struct socket *);
    319 	dstsock = va_arg(ap, struct sockaddr_in6 *);
    320 	control = va_arg(ap, struct mbuf *);
    321 	va_end(ap);
    322 
    323 	in6p = sotoin6pcb(so);
    324 
    325 	priv = 0;
    326     {
    327 	struct proc *p = curproc;	/* XXX */
    328 
    329 	if (p && !suser(p->p_ucred, &p->p_acflag))
    330 		priv = 1;
    331     }
    332 	dst = &dstsock->sin6_addr;
    333 	if (control) {
    334 		if ((error = ip6_setpktoptions(control, &opt, priv)) != 0)
    335 			goto bad;
    336 		optp = &opt;
    337 	} else
    338 		optp = in6p->in6p_outputopts;
    339 
    340 	/*
    341 	 * For an ICMPv6 packet, we should know its type and code
    342 	 * to update statistics.
    343 	 */
    344 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
    345 		struct icmp6_hdr *icmp6;
    346 		if (m->m_len < sizeof(struct icmp6_hdr) &&
    347 		    (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
    348 			error = ENOBUFS;
    349 			goto bad;
    350 		}
    351 		icmp6 = mtod(m, struct icmp6_hdr *);
    352 		type = icmp6->icmp6_type;
    353 		code = icmp6->icmp6_code;
    354 	}
    355 
    356 	M_PREPEND(m, sizeof(*ip6), M_WAIT);
    357 	ip6 = mtod(m, struct ip6_hdr *);
    358 
    359 	/*
    360 	 * Next header might not be ICMP6 but use its pseudo header anyway.
    361 	 */
    362 	ip6->ip6_dst = *dst;
    363 
    364 	/* KAME hack: embed scopeid */
    365 	origoptp = in6p->in6p_outputopts;
    366 	in6p->in6p_outputopts = optp;
    367 	if (in6_embedscope(&ip6->ip6_dst, dstsock, in6p, &oifp) != 0) {
    368 		error = EINVAL;
    369 		goto bad;
    370 	}
    371 	in6p->in6p_outputopts = origoptp;
    372 
    373 	/*
    374 	 * Source address selection.
    375 	 */
    376 	{
    377 		struct in6_addr *in6a;
    378 
    379 		if ((in6a = in6_selectsrc(dstsock, optp,
    380 					  in6p->in6p_moptions,
    381 					  &in6p->in6p_route,
    382 					  &in6p->in6p_laddr,
    383 					  &error)) == 0) {
    384 			if (error == 0)
    385 				error = EADDRNOTAVAIL;
    386 			goto bad;
    387 		}
    388 		ip6->ip6_src = *in6a;
    389 		if (in6p->in6p_route.ro_rt) {
    390 			/* what if oifp contradicts ? */
    391 			oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];
    392 		}
    393 	}
    394 
    395 	ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
    396 	ip6->ip6_vfc  &= ~IPV6_VERSION_MASK;
    397 	ip6->ip6_vfc  |= IPV6_VERSION;
    398 #if 0				/* ip6_plen will be filled in ip6_output. */
    399 	ip6->ip6_plen  = htons((u_short)plen);
    400 #endif
    401 	ip6->ip6_nxt   = in6p->in6p_ip6.ip6_nxt;
    402 	ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
    403 
    404 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
    405 	    in6p->in6p_cksum != -1) {
    406 		struct mbuf *n;
    407 		int off;
    408 		u_int16_t *p;
    409 
    410 #define	offsetof(type, member)	((size_t)(&((type *)0)->member)) /* XXX */
    411 
    412 		/* compute checksum */
    413 		if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
    414 			off = offsetof(struct icmp6_hdr, icmp6_cksum);
    415 		else
    416 			off = in6p->in6p_cksum;
    417 		if (plen < off + 1) {
    418 			error = EINVAL;
    419 			goto bad;
    420 		}
    421 		off += sizeof(struct ip6_hdr);
    422 
    423 		n = m;
    424 		while (n && n->m_len <= off) {
    425 			off -= n->m_len;
    426 			n = n->m_next;
    427 		}
    428 		if (!n)
    429 			goto bad;
    430 		p = (u_int16_t *)(mtod(n, caddr_t) + off);
    431 		*p = 0;
    432 		*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
    433 	}
    434 
    435 #ifdef IPSEC
    436 	if (ipsec_setsocket(m, so) != 0) {
    437 		error = ENOBUFS;
    438 		goto bad;
    439 	}
    440 #endif /*IPSEC*/
    441 
    442 	error = ip6_output(m, optp, &in6p->in6p_route, 0, in6p->in6p_moptions,
    443 			   &oifp);
    444 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
    445 		if (oifp)
    446 			icmp6_ifoutstat_inc(oifp, type, code);
    447 		icmp6stat.icp6s_outhist[type]++;
    448 	}
    449 
    450 	goto freectl;
    451 
    452  bad:
    453 	if (m)
    454 		m_freem(m);
    455 
    456  freectl:
    457 	if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
    458 		RTFREE(optp->ip6po_route.ro_rt);
    459 	if (control)
    460 		m_freem(control);
    461 	return(error);
    462 }
    463 
    464 /*
    465  * Raw IPv6 socket option processing.
    466  */
    467 int
    468 rip6_ctloutput(op, so, level, optname, m)
    469 	int op;
    470 	struct socket *so;
    471 	int level, optname;
    472 	struct mbuf **m;
    473 {
    474 	int error = 0;
    475 
    476 	switch(level) {
    477 	 case IPPROTO_IPV6:
    478 		 switch(optname) {
    479 		  case MRT6_INIT:
    480 		  case MRT6_DONE:
    481 		  case MRT6_ADD_MIF:
    482 		  case MRT6_DEL_MIF:
    483 		  case MRT6_ADD_MFC:
    484 		  case MRT6_DEL_MFC:
    485 		  case MRT6_PIM:
    486 			  if (op == PRCO_SETOPT) {
    487 				  error = ip6_mrouter_set(optname, so, *m);
    488 				  if (*m)
    489 					  (void)m_free(*m);
    490 			  } else if (op == PRCO_GETOPT) {
    491 				  error = ip6_mrouter_get(optname, so, m);
    492 			  } else
    493 				  error = EINVAL;
    494 			  return (error);
    495 		 }
    496 		 return (ip6_ctloutput(op, so, level, optname, m));
    497 		 /* NOTREACHED */
    498 
    499 	 case IPPROTO_ICMPV6:
    500 		 /*
    501 		  * XXX: is it better to call icmp6_ctloutput() directly
    502 		  * from protosw?
    503 		  */
    504 		 return(icmp6_ctloutput(op, so, level, optname, m));
    505 
    506 	 default:
    507 		 if (op == PRCO_SETOPT && *m)
    508 			 (void)m_free(*m);
    509 		 return(EINVAL);
    510 	}
    511 }
    512 
    513 extern	u_long rip6_sendspace;
    514 extern	u_long rip6_recvspace;
    515 
    516 int
    517 rip6_usrreq(so, req, m, nam, control, p)
    518 	register struct socket *so;
    519 	int req;
    520 	struct mbuf *m, *nam, *control;
    521 	struct proc *p;
    522 {
    523 	register struct in6pcb *in6p = sotoin6pcb(so);
    524 	int s;
    525 	int error = 0;
    526 /*	extern	struct socket *ip6_mrouter; */ /* xxx */
    527 	int priv;
    528 
    529 	priv = 0;
    530 	if (p && !suser(p->p_ucred, &p->p_acflag))
    531 		priv++;
    532 
    533 	if (req == PRU_CONTROL)
    534 		return (in6_control(so, (u_long)m, (caddr_t)nam,
    535 				    (struct ifnet *)control, p));
    536 
    537 	if (req == PRU_PURGEIF) {
    538 		in6_purgeif((struct ifnet *)control);
    539 		in6_pcbpurgeif(&rawin6pcb, (struct ifnet *)control);
    540 		return (0);
    541 	}
    542 
    543 	switch (req) {
    544 	case PRU_ATTACH:
    545 		if (in6p)
    546 			panic("rip6_attach");
    547 		if (!priv) {
    548 			error = EACCES;
    549 			break;
    550 		}
    551 		s = splsoftnet();
    552 		if ((error = soreserve(so, rip6_sendspace, rip6_recvspace)) ||
    553 		    (error = in6_pcballoc(so, &rawin6pcb))) {
    554 			splx(s);
    555 			break;
    556 		}
    557 		splx(s);
    558 		in6p = sotoin6pcb(so);
    559 		in6p->in6p_ip6.ip6_nxt = (long)nam;
    560 		in6p->in6p_cksum = -1;
    561 #ifdef IPSEC
    562 		error = ipsec_init_policy(so, &in6p->in6p_sp);
    563 		if (error != 0) {
    564 			in6_pcbdetach(in6p);
    565 			break;
    566 		}
    567 #endif /*IPSEC*/
    568 
    569 		MALLOC(in6p->in6p_icmp6filt, struct icmp6_filter *,
    570 			sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
    571 		if (in6p->in6p_icmp6filt == NULL) {
    572 			in6_pcbdetach(in6p);
    573 			error = ENOMEM;
    574 			break;
    575 		}
    576 		ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt);
    577 		break;
    578 
    579 	case PRU_DISCONNECT:
    580 		if ((so->so_state & SS_ISCONNECTED) == 0) {
    581 			error = ENOTCONN;
    582 			break;
    583 		}
    584 		in6p->in6p_faddr = in6addr_any;
    585 		so->so_state &= ~SS_ISCONNECTED;	/* XXX */
    586 		break;
    587 
    588 	case PRU_ABORT:
    589 		soisdisconnected(so);
    590 		/* Fallthrough */
    591 	case PRU_DETACH:
    592 		if (in6p == 0)
    593 			panic("rip6_detach");
    594 		if (so == ip6_mrouter)
    595 			ip6_mrouter_done();
    596 		/* xxx: RSVP */
    597 		if (in6p->in6p_icmp6filt) {
    598 			FREE(in6p->in6p_icmp6filt, M_PCB);
    599 			in6p->in6p_icmp6filt = NULL;
    600 		}
    601 		in6_pcbdetach(in6p);
    602 		break;
    603 
    604 	case PRU_BIND:
    605 	    {
    606 		struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
    607 		struct ifaddr *ia = NULL;
    608 
    609 		if (nam->m_len != sizeof(*addr)) {
    610 			error = EINVAL;
    611 			break;
    612 		}
    613 		if ((ifnet.tqh_first == 0) || (addr->sin6_family != AF_INET6)) {
    614 			error = EADDRNOTAVAIL;
    615 			break;
    616 		}
    617 #ifdef ENABLE_DEFAULT_SCOPE
    618 		if (addr->sin6_scope_id == 0)	/* not change if specified  */
    619 			addr->sin6_scope_id =
    620 				scope6_addr2default(&addr->sin6_addr);
    621 #endif
    622 		/*
    623 		 * we don't support mapped address here, it would confuse
    624 		 * users so reject it
    625 		 */
    626 		if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) {
    627 			error = EADDRNOTAVAIL;
    628 			break;
    629 		}
    630 		/*
    631 		 * Currently, ifa_ifwithaddr tends to fail for a link-local
    632 		 * address, since it implicitly expects that the link ID
    633 		 * for the address is embedded in the sin6_addr part.
    634 		 * For now, we'd rather keep this "as is". We'll eventually fix
    635 		 * this in a more natural way.
    636 		 */
    637 		if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
    638 		    (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0) {
    639 			error = EADDRNOTAVAIL;
    640 			break;
    641 		}
    642 		if (ia &&
    643 		    ((struct in6_ifaddr *)ia)->ia6_flags &
    644 		    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
    645 		     IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
    646 			error = EADDRNOTAVAIL;
    647 			break;
    648 		}
    649 		in6p->in6p_laddr = addr->sin6_addr;
    650 		break;
    651 	    }
    652 
    653 	case PRU_CONNECT:
    654 	    {
    655 		struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
    656 		struct in6_addr *in6a = NULL;
    657 #ifdef ENABLE_DEFAULT_SCOPE
    658 		struct sockaddr_in6 sin6;
    659 #endif
    660 
    661 		if (nam->m_len != sizeof(*addr)) {
    662 			error = EINVAL;
    663 			break;
    664 		}
    665 		if (ifnet.tqh_first == 0)
    666 		{
    667 			error = EADDRNOTAVAIL;
    668 			break;
    669 		}
    670 		if (addr->sin6_family != AF_INET6) {
    671 			error = EAFNOSUPPORT;
    672 			break;
    673 		}
    674 
    675 #ifdef ENABLE_DEFAULT_SCOPE
    676 		if (addr->sin6_scope_id == 0) {
    677 			/* protect *addr */
    678 			sin6 = *addr;
    679 			addr = &sin6;
    680 			addr->sin6_scope_id =
    681 				scope6_addr2default(&addr->sin6_addr);
    682 		}
    683 #endif
    684 
    685 		/* Source address selection. XXX: need pcblookup? */
    686 		in6a = in6_selectsrc(addr, in6p->in6p_outputopts,
    687 				     in6p->in6p_moptions,
    688 				     &in6p->in6p_route,
    689 				     &in6p->in6p_laddr,
    690 				     &error);
    691 		if (in6a == NULL) {
    692 			if (error == 0)
    693 				error = EADDRNOTAVAIL;
    694 			break;
    695 		}
    696 		in6p->in6p_laddr = *in6a;
    697 		in6p->in6p_faddr = addr->sin6_addr;
    698 		soisconnected(so);
    699 		break;
    700 	    }
    701 
    702 	case PRU_CONNECT2:
    703 		error = EOPNOTSUPP;
    704 		break;
    705 
    706 	/*
    707 	 * Mark the connection as being incapable of futther input.
    708 	 */
    709 	case PRU_SHUTDOWN:
    710 		socantsendmore(so);
    711 		break;
    712 	/*
    713 	 * Ship a packet out. The appropriate raw output
    714 	 * routine handles any messaging necessary.
    715 	 */
    716 	case PRU_SEND:
    717 	    {
    718 		struct sockaddr_in6 tmp;
    719 		struct sockaddr_in6 *dst;
    720 
    721 		/* always copy sockaddr to avoid overwrites */
    722 		if (so->so_state & SS_ISCONNECTED) {
    723 			if (nam) {
    724 				error = EISCONN;
    725 				break;
    726 			}
    727 			/* XXX */
    728 			bzero(&tmp, sizeof(tmp));
    729 			tmp.sin6_family = AF_INET6;
    730 			tmp.sin6_len = sizeof(struct sockaddr_in6);
    731 			bcopy(&in6p->in6p_faddr, &tmp.sin6_addr,
    732 				sizeof(struct in6_addr));
    733 			dst = &tmp;
    734 		} else {
    735 			if (nam == NULL) {
    736 				error = ENOTCONN;
    737 				break;
    738 			}
    739 			tmp = *mtod(nam, struct sockaddr_in6 *);
    740 			dst = &tmp;
    741 		}
    742 #ifdef ENABLE_DEFAULT_SCOPE
    743 		if (dst->sin6_scope_id == 0) {
    744 			dst->sin6_scope_id =
    745 				scope6_addr2default(&dst->sin6_addr);
    746 		}
    747 #endif
    748 		error = rip6_output(m, so, dst, control);
    749 		m = NULL;
    750 		break;
    751 	    }
    752 
    753 	case PRU_SENSE:
    754 		/*
    755 		 * stat: don't bother with a blocksize
    756 		 */
    757 		return(0);
    758 	/*
    759 	 * Not supported.
    760 	 */
    761 	case PRU_RCVOOB:
    762 	case PRU_RCVD:
    763 	case PRU_LISTEN:
    764 	case PRU_ACCEPT:
    765 	case PRU_SENDOOB:
    766 		error = EOPNOTSUPP;
    767 		break;
    768 
    769 	case PRU_SOCKADDR:
    770 		in6_setsockaddr(in6p, nam);
    771 		break;
    772 
    773 	case PRU_PEERADDR:
    774 		in6_setpeeraddr(in6p, nam);
    775 		break;
    776 
    777 	default:
    778 		panic("rip6_usrreq");
    779 	}
    780 	if (m != NULL)
    781 		m_freem(m);
    782 	return(error);
    783 }
    784