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raw_ip6.c revision 1.22.2.1 
      1 /*	$NetBSD: raw_ip6.c,v 1.22.2.1 2000/06/22 17:10:05 minoura Exp $	*/
      2 /*	$KAME: raw_ip6.c,v 1.28 2000/05/28 23:25:07 itojun Exp $	*/
      3 
      4 /*
      5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the project nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * Copyright (c) 1982, 1986, 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 
     94 #ifdef IPSEC
     95 #include <netinet6/ipsec.h>
     96 #endif /*IPSEC*/
     97 
     98 #include <machine/stdarg.h>
     99 
    100 #include "faith.h"
    101 
    102 struct	in6pcb rawin6pcb;
    103 #define ifatoia6(ifa)	((struct in6_ifaddr *)(ifa))
    104 
    105 /*
    106  * Raw interface to IP6 protocol.
    107  */
    108 
    109 /*
    110  * Initialize raw connection block queue.
    111  */
    112 void
    113 rip6_init()
    114 {
    115 	rawin6pcb.in6p_next = rawin6pcb.in6p_prev = &rawin6pcb;
    116 }
    117 
    118 /*
    119  * Setup generic address and protocol structures
    120  * for raw_input routine, then pass them along with
    121  * mbuf chain.
    122  */
    123 int
    124 rip6_input(mp, offp, proto)
    125 	struct	mbuf **mp;
    126 	int	*offp, proto;
    127 {
    128 	struct mbuf *m = *mp;
    129 	register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
    130 	register struct in6pcb *in6p;
    131 	struct in6pcb *last = NULL;
    132 	struct sockaddr_in6 rip6src;
    133 	struct mbuf *opts = NULL;
    134 
    135 #if defined(NFAITH) && 0 < NFAITH
    136 	if (m->m_pkthdr.rcvif) {
    137 		if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
    138 			/* send icmp6 host unreach? */
    139 			m_freem(m);
    140 			return IPPROTO_DONE;
    141 		}
    142 	}
    143 #endif
    144 
    145 	/* Be proactive about malicious use of IPv4 mapped address */
    146 	if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
    147 	    IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
    148 		/* XXX stat */
    149 		m_freem(m);
    150 		return IPPROTO_DONE;
    151 	}
    152 
    153 	bzero(&rip6src, sizeof(rip6src));
    154 	rip6src.sin6_len = sizeof(struct sockaddr_in6);
    155 	rip6src.sin6_family = AF_INET6;
    156 	rip6src.sin6_addr = ip6->ip6_src;
    157 	if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
    158 		rip6src.sin6_addr.s6_addr16[1] = 0;
    159 	if (m->m_pkthdr.rcvif) {
    160 		if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
    161 			rip6src.sin6_scope_id = m->m_pkthdr.rcvif->if_index;
    162 		else
    163 			rip6src.sin6_scope_id = 0;
    164 	} else
    165 		rip6src.sin6_scope_id = 0;
    166 
    167 	for (in6p = rawin6pcb.in6p_next;
    168 	     in6p != &rawin6pcb; in6p = in6p->in6p_next) {
    169 		if (in6p->in6p_ip6.ip6_nxt &&
    170 		    in6p->in6p_ip6.ip6_nxt != proto)
    171 			continue;
    172 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
    173 		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
    174 			continue;
    175 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
    176 		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
    177 			continue;
    178 		if (in6p->in6p_cksum != -1
    179 		 && in6_cksum(m, ip6->ip6_nxt, *offp, m->m_pkthdr.len - *offp))
    180 		{
    181 			/* XXX bark something */
    182 			continue;
    183 		}
    184 		if (last) {
    185 			struct	mbuf *n;
    186 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
    187 				if (last->in6p_flags & IN6P_CONTROLOPTS)
    188 					ip6_savecontrol(last, &opts, ip6, n);
    189 				/* strip intermediate headers */
    190 				m_adj(n, *offp);
    191 				if (sbappendaddr(&last->in6p_socket->so_rcv,
    192 						(struct sockaddr *)&rip6src,
    193 						 n, opts) == 0) {
    194 					/* should notify about lost packet */
    195 					m_freem(n);
    196 					if (opts)
    197 						m_freem(opts);
    198 				} else
    199 					sorwakeup(last->in6p_socket);
    200 				opts = NULL;
    201 			}
    202 		}
    203 		last = in6p;
    204 	}
    205 	if (last) {
    206 		if (last->in6p_flags & IN6P_CONTROLOPTS)
    207 			ip6_savecontrol(last, &opts, ip6, m);
    208 		/* strip intermediate headers */
    209 		m_adj(m, *offp);
    210 		if (sbappendaddr(&last->in6p_socket->so_rcv,
    211 				(struct sockaddr *)&rip6src, m, opts) == 0) {
    212 			m_freem(m);
    213 			if (opts)
    214 				m_freem(opts);
    215 		} else
    216 			sorwakeup(last->in6p_socket);
    217 	} else {
    218 		if (proto == IPPROTO_NONE)
    219 			m_freem(m);
    220 		else {
    221 			char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
    222 			icmp6_error(m, ICMP6_PARAM_PROB,
    223 				    ICMP6_PARAMPROB_NEXTHEADER,
    224 				    prvnxtp - mtod(m, char *));
    225 		}
    226 		ip6stat.ip6s_delivered--;
    227 	}
    228 	return IPPROTO_DONE;
    229 }
    230 
    231 void
    232 rip6_ctlinput(cmd, sa, d)
    233 	int cmd;
    234 	struct sockaddr *sa;
    235 	void *d;
    236 {
    237 	struct sockaddr_in6 sa6;
    238 	register struct ip6_hdr *ip6;
    239 	struct mbuf *m;
    240 	int off;
    241 	void (*notify) __P((struct in6pcb *, int)) = in6_rtchange;
    242 
    243 	if (sa->sa_family != AF_INET6 ||
    244 	    sa->sa_len != sizeof(struct sockaddr_in6))
    245 		return;
    246 
    247 	if ((unsigned)cmd >= PRC_NCMDS)
    248 		return;
    249 	if (PRC_IS_REDIRECT(cmd))
    250 		notify = in6_rtchange, d = NULL;
    251 	else if (cmd == PRC_HOSTDEAD)
    252 		d = NULL;
    253 	else if (inet6ctlerrmap[cmd] == 0)
    254 		return;
    255 
    256 	/* if the parameter is from icmp6, decode it. */
    257 	if (d != NULL) {
    258 		struct ip6ctlparam *ip6cp = (struct ip6ctlparam *)d;
    259 		m = ip6cp->ip6c_m;
    260 		ip6 = ip6cp->ip6c_ip6;
    261 		off = ip6cp->ip6c_off;
    262 	} else {
    263 		m = NULL;
    264 		ip6 = NULL;
    265 	}
    266 
    267 	/* translate addresses into internal form */
    268 	sa6 = *(struct sockaddr_in6 *)sa;
    269 	if (IN6_IS_ADDR_LINKLOCAL(&sa6.sin6_addr) && m && m->m_pkthdr.rcvif)
    270 		sa6.sin6_addr.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
    271 
    272 	if (ip6) {
    273 		/*
    274 		 * XXX: We assume that when IPV6 is non NULL,
    275 		 * M and OFF are valid.
    276 		 */
    277 		struct in6_addr s;
    278 
    279 		/* translate addresses into internal form */
    280 		memcpy(&s, &ip6->ip6_src, sizeof(s));
    281 		if (IN6_IS_ADDR_LINKLOCAL(&s))
    282 			s.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
    283 
    284 		(void) in6_pcbnotify(&rawin6pcb, (struct sockaddr *)&sa6,
    285 					0, &s, 0, cmd, notify);
    286 	} else {
    287 		(void) in6_pcbnotify(&rawin6pcb, (struct sockaddr *)&sa6, 0,
    288 					&zeroin6_addr, 0, cmd, notify);
    289 	}
    290 }
    291 
    292 /*
    293  * Generate IPv6 header and pass packet to ip6_output.
    294  * Tack on options user may have setup with control call.
    295  */
    296 int
    297 #if __STDC__
    298 rip6_output(struct mbuf *m, ...)
    299 #else
    300 rip6_output(m, va_alist)
    301 	struct mbuf *m;
    302 	va_dcl
    303 #endif
    304 {
    305 	struct socket *so;
    306 	struct sockaddr_in6 *dstsock;
    307 	struct mbuf *control;
    308 	struct in6_addr *dst;
    309 	struct ip6_hdr *ip6;
    310 	struct in6pcb *in6p;
    311 	u_int	plen = m->m_pkthdr.len;
    312 	int error = 0;
    313 	struct ip6_pktopts opt, *optp = NULL;
    314 	struct ifnet *oifp = NULL;
    315 	int type, code;		/* for ICMPv6 output statistics only */
    316 	int priv = 0;
    317 	va_list ap;
    318 
    319 	va_start(ap, m);
    320 	so = va_arg(ap, struct socket *);
    321 	dstsock = va_arg(ap, struct sockaddr_in6 *);
    322 	control = va_arg(ap, struct mbuf *);
    323 	va_end(ap);
    324 
    325 	in6p = sotoin6pcb(so);
    326 
    327 	priv = 0;
    328     {
    329 	struct proc *p = curproc;	/* XXX */
    330 
    331 	if (p && !suser(p->p_ucred, &p->p_acflag))
    332 		priv = 1;
    333     }
    334 	dst = &dstsock->sin6_addr;
    335 	if (control) {
    336 		if ((error = ip6_setpktoptions(control, &opt, priv)) != 0)
    337 			goto bad;
    338 		optp = &opt;
    339 	} else
    340 		optp = in6p->in6p_outputopts;
    341 
    342 	/*
    343 	 * For an ICMPv6 packet, we should know its type and code
    344 	 * to update statistics.
    345 	 */
    346 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
    347 		struct icmp6_hdr *icmp6;
    348 		if (m->m_len < sizeof(struct icmp6_hdr) &&
    349 		    (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
    350 			error = ENOBUFS;
    351 			goto bad;
    352 		}
    353 		icmp6 = mtod(m, struct icmp6_hdr *);
    354 		type = icmp6->icmp6_type;
    355 		code = icmp6->icmp6_code;
    356 	}
    357 
    358 	M_PREPEND(m, sizeof(*ip6), M_WAIT);
    359 	ip6 = mtod(m, struct ip6_hdr *);
    360 
    361 	/*
    362 	 * Next header might not be ICMP6 but use its pseudo header anyway.
    363 	 */
    364 	ip6->ip6_dst = *dst;
    365 
    366 	/*
    367 	 * If the scope of the destination is link-local, embed the interface
    368 	 * index in the address.
    369 	 *
    370 	 * XXX advanced-api value overrides sin6_scope_id
    371 	 */
    372 	if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst) ||
    373 	    IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) {
    374 		struct in6_pktinfo *pi;
    375 
    376 		/*
    377 		 * XXX Boundary check is assumed to be already done in
    378 		 * ip6_setpktoptions().
    379 		 */
    380 		if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
    381 			ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
    382 			oifp = ifindex2ifnet[pi->ipi6_ifindex];
    383 		}
    384 		else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
    385 			 in6p->in6p_moptions &&
    386 			 in6p->in6p_moptions->im6o_multicast_ifp) {
    387 			oifp = in6p->in6p_moptions->im6o_multicast_ifp;
    388 			ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
    389 		} else if (dstsock->sin6_scope_id) {
    390 			/* boundary check */
    391 			if (dstsock->sin6_scope_id < 0
    392 			 || if_index < dstsock->sin6_scope_id) {
    393 				error = ENXIO;  /* XXX EINVAL? */
    394 				goto bad;
    395 			}
    396 			ip6->ip6_dst.s6_addr16[1]
    397 				= htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
    398 		}
    399 	}
    400 
    401 	/*
    402 	 * Source address selection.
    403 	 */
    404 	{
    405 		struct in6_addr *in6a;
    406 
    407 		if ((in6a = in6_selectsrc(dstsock, optp,
    408 					  in6p->in6p_moptions,
    409 					  &in6p->in6p_route,
    410 					  &in6p->in6p_laddr,
    411 					  &error)) == 0) {
    412 			if (error == 0)
    413 				error = EADDRNOTAVAIL;
    414 			goto bad;
    415 		}
    416 		ip6->ip6_src = *in6a;
    417 		if (in6p->in6p_route.ro_rt)
    418 			oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];
    419 	}
    420 
    421 	ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
    422 	ip6->ip6_vfc  &= ~IPV6_VERSION_MASK;
    423 	ip6->ip6_vfc  |= IPV6_VERSION;
    424 #if 0				/* ip6_plen will be filled in ip6_output. */
    425 	ip6->ip6_plen  = htons((u_short)plen);
    426 #endif
    427 	ip6->ip6_nxt   = in6p->in6p_ip6.ip6_nxt;
    428 	ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
    429 
    430 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
    431 	    in6p->in6p_cksum != -1) {
    432 		struct mbuf *n;
    433 		int off;
    434 		u_int16_t *p;
    435 
    436 #define	offsetof(type, member)	((size_t)(&((type *)0)->member)) /* XXX */
    437 
    438 		/* compute checksum */
    439 		if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
    440 			off = offsetof(struct icmp6_hdr, icmp6_cksum);
    441 		else
    442 			off = in6p->in6p_cksum;
    443 		if (plen < off + 1) {
    444 			error = EINVAL;
    445 			goto bad;
    446 		}
    447 		off += sizeof(struct ip6_hdr);
    448 
    449 		n = m;
    450 		while (n && n->m_len <= off) {
    451 			off -= n->m_len;
    452 			n = n->m_next;
    453 		}
    454 		if (!n)
    455 			goto bad;
    456 		p = (u_int16_t *)(mtod(n, caddr_t) + off);
    457 		*p = 0;
    458 		*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
    459 	}
    460 
    461 	error = ip6_output(m, optp, &in6p->in6p_route, 0, in6p->in6p_moptions,
    462 			   &oifp);
    463 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
    464 		if (oifp)
    465 			icmp6_ifoutstat_inc(oifp, type, code);
    466 		icmp6stat.icp6s_outhist[type]++;
    467 	}
    468 
    469 	goto freectl;
    470 
    471  bad:
    472 	if (m)
    473 		m_freem(m);
    474 
    475  freectl:
    476 	if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
    477 		RTFREE(optp->ip6po_route.ro_rt);
    478 	if (control)
    479 		m_freem(control);
    480 	return(error);
    481 }
    482 
    483 /*
    484  * Raw IPv6 socket option processing.
    485  */
    486 int
    487 rip6_ctloutput(op, so, level, optname, m)
    488 	int op;
    489 	struct socket *so;
    490 	int level, optname;
    491 	struct mbuf **m;
    492 {
    493 	int error = 0;
    494 
    495 	switch(level) {
    496 	 case IPPROTO_IPV6:
    497 		 switch(optname) {
    498 		  case MRT6_INIT:
    499 		  case MRT6_DONE:
    500 		  case MRT6_ADD_MIF:
    501 		  case MRT6_DEL_MIF:
    502 		  case MRT6_ADD_MFC:
    503 		  case MRT6_DEL_MFC:
    504 		  case MRT6_PIM:
    505 			  if (op == PRCO_SETOPT) {
    506 				  error = ip6_mrouter_set(optname, so, *m);
    507 				  if (*m)
    508 					  (void)m_free(*m);
    509 			  } else if (op == PRCO_GETOPT) {
    510 				  error = ip6_mrouter_get(optname, so, m);
    511 			  } else
    512 				  error = EINVAL;
    513 			  return (error);
    514 		 }
    515 		 return (ip6_ctloutput(op, so, level, optname, m));
    516 		 /* NOTREACHED */
    517 
    518 	 case IPPROTO_ICMPV6:
    519 		 /*
    520 		  * XXX: is it better to call icmp6_ctloutput() directly
    521 		  * from protosw?
    522 		  */
    523 		 return(icmp6_ctloutput(op, so, level, optname, m));
    524 
    525 	 default:
    526 		 if (op == PRCO_SETOPT && *m)
    527 			 (void)m_free(*m);
    528 		 return(EINVAL);
    529 	}
    530 }
    531 
    532 extern	u_long rip6_sendspace;
    533 extern	u_long rip6_recvspace;
    534 
    535 int
    536 rip6_usrreq(so, req, m, nam, control, p)
    537 	register struct socket *so;
    538 	int req;
    539 	struct mbuf *m, *nam, *control;
    540 	struct proc *p;
    541 {
    542 	register struct in6pcb *in6p = sotoin6pcb(so);
    543 	int s;
    544 	int error = 0;
    545 /*	extern	struct socket *ip6_mrouter; */ /* xxx */
    546 	int priv;
    547 
    548 	priv = 0;
    549 	if (p && !suser(p->p_ucred, &p->p_acflag))
    550 		priv++;
    551 
    552 	if (req == PRU_CONTROL)
    553 		return (in6_control(so, (u_long)m, (caddr_t)nam,
    554 				    (struct ifnet *)control, p));
    555 
    556 	if (req == PRU_PURGEIF) {
    557 		in6_purgeif((struct ifnet *)control);
    558 		in6_pcbpurgeif(&rawin6pcb, (struct ifnet *)control);
    559 		return (0);
    560 	}
    561 
    562 	switch (req) {
    563 	case PRU_ATTACH:
    564 		if (in6p)
    565 			panic("rip6_attach");
    566 		if (!priv) {
    567 			error = EACCES;
    568 			break;
    569 		}
    570 		s = splsoftnet();
    571 		if ((error = soreserve(so, rip6_sendspace, rip6_recvspace)) ||
    572 		    (error = in6_pcballoc(so, &rawin6pcb))) {
    573 			splx(s);
    574 			break;
    575 		}
    576 		splx(s);
    577 		in6p = sotoin6pcb(so);
    578 		in6p->in6p_ip6.ip6_nxt = (long)nam;
    579 		in6p->in6p_cksum = -1;
    580 #ifdef IPSEC
    581 		error = ipsec_init_policy(so, &in6p->in6p_sp);
    582 		if (error != 0) {
    583 			in6_pcbdetach(in6p);
    584 			break;
    585 		}
    586 #endif /*IPSEC*/
    587 
    588 		MALLOC(in6p->in6p_icmp6filt, struct icmp6_filter *,
    589 			sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
    590 		if (in6p->in6p_icmp6filt == NULL) {
    591 			in6_pcbdetach(in6p);
    592 			error = ENOMEM;
    593 			break;
    594 		}
    595 		ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt);
    596 		break;
    597 
    598 	case PRU_DISCONNECT:
    599 		if ((so->so_state & SS_ISCONNECTED) == 0) {
    600 			error = ENOTCONN;
    601 			break;
    602 		}
    603 		in6p->in6p_faddr = in6addr_any;
    604 		so->so_state &= ~SS_ISCONNECTED;	/* XXX */
    605 		break;
    606 
    607 	case PRU_ABORT:
    608 		soisdisconnected(so);
    609 		/* Fallthrough */
    610 	case PRU_DETACH:
    611 		if (in6p == 0)
    612 			panic("rip6_detach");
    613 		if (so == ip6_mrouter)
    614 			ip6_mrouter_done();
    615 		/* xxx: RSVP */
    616 		if (in6p->in6p_icmp6filt) {
    617 			FREE(in6p->in6p_icmp6filt, M_PCB);
    618 			in6p->in6p_icmp6filt = NULL;
    619 		}
    620 		in6_pcbdetach(in6p);
    621 		break;
    622 
    623 	case PRU_BIND:
    624 	    {
    625 		struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
    626 		struct ifaddr *ia = NULL;
    627 
    628 		if (nam->m_len != sizeof(*addr)) {
    629 			error = EINVAL;
    630 			break;
    631 		}
    632 
    633 		/*
    634 		 * we don't support mapped address here, it would confuse
    635 		 * users so reject it
    636 		 */
    637 		if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) {
    638 			error = EADDRNOTAVAIL;
    639 			break;
    640 		}
    641 
    642 		if ((ifnet.tqh_first == 0) ||
    643 		   (addr->sin6_family != AF_INET6) ||
    644 		   (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
    645 		    (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)) {
    646 			error = EADDRNOTAVAIL;
    647 			break;
    648 		}
    649 		if (ia &&
    650 		    ((struct in6_ifaddr *)ia)->ia6_flags &
    651 		    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
    652 		     IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
    653 			error = EADDRNOTAVAIL;
    654 			break;
    655 		}
    656 		in6p->in6p_laddr = addr->sin6_addr;
    657 		break;
    658 	    }
    659 
    660 	case PRU_CONNECT:
    661 	    {
    662 		struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
    663 		struct in6_addr *in6a = NULL;
    664 
    665 		if (nam->m_len != sizeof(*addr)) {
    666 			error = EINVAL;
    667 			break;
    668 		}
    669 		if (ifnet.tqh_first == 0) {
    670 			error = EADDRNOTAVAIL;
    671 			break;
    672 		}
    673 		if (addr->sin6_family != AF_INET6) {
    674 			error = EAFNOSUPPORT;
    675 			break;
    676 		}
    677 
    678 		/* Source address selection. XXX: need pcblookup? */
    679 		in6a = in6_selectsrc(addr, in6p->in6p_outputopts,
    680 				     in6p->in6p_moptions,
    681 				     &in6p->in6p_route,
    682 				     &in6p->in6p_laddr,
    683 				     &error);
    684 		if (in6a == NULL) {
    685 			if (error == 0)
    686 				error = EADDRNOTAVAIL;
    687 			break;
    688 		}
    689 		in6p->in6p_laddr = *in6a;
    690 		in6p->in6p_faddr = addr->sin6_addr;
    691 		soisconnected(so);
    692 		break;
    693 	    }
    694 
    695 	case PRU_CONNECT2:
    696 		error = EOPNOTSUPP;
    697 		break;
    698 
    699 	/*
    700 	 * Mark the connection as being incapable of futther input.
    701 	 */
    702 	case PRU_SHUTDOWN:
    703 		socantsendmore(so);
    704 		break;
    705 	/*
    706 	 * Ship a packet out. The appropriate raw output
    707 	 * routine handles any messaging necessary.
    708 	 */
    709 	case PRU_SEND:
    710 	    {
    711 		struct sockaddr_in6 tmp;
    712 		struct sockaddr_in6 *dst;
    713 
    714 		if (so->so_state & SS_ISCONNECTED) {
    715 			if (nam) {
    716 				error = EISCONN;
    717 				break;
    718 			}
    719 			/* XXX */
    720 			bzero(&tmp, sizeof(tmp));
    721 			tmp.sin6_family = AF_INET6;
    722 			tmp.sin6_len = sizeof(struct sockaddr_in6);
    723 			bcopy(&in6p->in6p_faddr, &tmp.sin6_addr,
    724 				sizeof(struct in6_addr));
    725 			dst = &tmp;
    726 		} else {
    727 			if (nam == NULL) {
    728 				error = ENOTCONN;
    729 				break;
    730 			}
    731 			dst = mtod(nam, struct sockaddr_in6 *);
    732 		}
    733 		error = rip6_output(m, so, dst, control);
    734 		m = NULL;
    735 		break;
    736 	    }
    737 
    738 	case PRU_SENSE:
    739 		/*
    740 		 * stat: don't bother with a blocksize
    741 		 */
    742 		return(0);
    743 	/*
    744 	 * Not supported.
    745 	 */
    746 	case PRU_RCVOOB:
    747 	case PRU_RCVD:
    748 	case PRU_LISTEN:
    749 	case PRU_ACCEPT:
    750 	case PRU_SENDOOB:
    751 		error = EOPNOTSUPP;
    752 		break;
    753 
    754 	case PRU_SOCKADDR:
    755 		in6_setsockaddr(in6p, nam);
    756 		break;
    757 
    758 	case PRU_PEERADDR:
    759 		in6_setpeeraddr(in6p, nam);
    760 		break;
    761 
    762 	default:
    763 		panic("rip6_usrreq");
    764 	}
    765 	if (m != NULL)
    766 		m_freem(m);
    767 	return(error);
    768 }
    769