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raw_ip6.c revision 1.23.2.1 
      1 /*	$NetBSD: raw_ip6.c,v 1.23.2.1 2001/02/26 22:44:34 he 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 
    187 #ifdef IPSEC
    188 			/*
    189 			 * Check AH/ESP integrity.
    190 			 */
    191 			if (ipsec6_in_reject(m, last)) {
    192 				ipsec6stat.in_polvio++;
    193 				/* do not inject data into pcb */
    194 			} else
    195 #endif /*IPSEC*/
    196 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
    197 				if (last->in6p_flags & IN6P_CONTROLOPTS)
    198 					ip6_savecontrol(last, &opts, ip6, n);
    199 				/* strip intermediate headers */
    200 				m_adj(n, *offp);
    201 				if (sbappendaddr(&last->in6p_socket->so_rcv,
    202 						(struct sockaddr *)&rip6src,
    203 						 n, opts) == 0) {
    204 					/* should notify about lost packet */
    205 					m_freem(n);
    206 					if (opts)
    207 						m_freem(opts);
    208 				} else
    209 					sorwakeup(last->in6p_socket);
    210 				opts = NULL;
    211 			}
    212 		}
    213 		last = in6p;
    214 	}
    215 #ifdef IPSEC
    216 	/*
    217 	 * Check AH/ESP integrity.
    218 	 */
    219 	if (last && ipsec6_in_reject(m, last)) {
    220 		m_freem(m);
    221 		ipsec6stat.in_polvio++;
    222 		ip6stat.ip6s_delivered--;
    223 		/* do not inject data into pcb */
    224 	} else
    225 #endif /*IPSEC*/
    226 	if (last) {
    227 		if (last->in6p_flags & IN6P_CONTROLOPTS)
    228 			ip6_savecontrol(last, &opts, ip6, m);
    229 		/* strip intermediate headers */
    230 		m_adj(m, *offp);
    231 		if (sbappendaddr(&last->in6p_socket->so_rcv,
    232 				(struct sockaddr *)&rip6src, m, opts) == 0) {
    233 			m_freem(m);
    234 			if (opts)
    235 				m_freem(opts);
    236 		} else
    237 			sorwakeup(last->in6p_socket);
    238 	} else {
    239 		if (proto == IPPROTO_NONE)
    240 			m_freem(m);
    241 		else {
    242 			char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
    243 			icmp6_error(m, ICMP6_PARAM_PROB,
    244 				    ICMP6_PARAMPROB_NEXTHEADER,
    245 				    prvnxtp - mtod(m, char *));
    246 		}
    247 		ip6stat.ip6s_delivered--;
    248 	}
    249 	return IPPROTO_DONE;
    250 }
    251 
    252 void
    253 rip6_ctlinput(cmd, sa, d)
    254 	int cmd;
    255 	struct sockaddr *sa;
    256 	void *d;
    257 {
    258 	struct sockaddr_in6 sa6;
    259 	register struct ip6_hdr *ip6;
    260 	struct mbuf *m;
    261 	int off;
    262 	void (*notify) __P((struct in6pcb *, int)) = in6_rtchange;
    263 
    264 	if (sa->sa_family != AF_INET6 ||
    265 	    sa->sa_len != sizeof(struct sockaddr_in6))
    266 		return;
    267 
    268 	if ((unsigned)cmd >= PRC_NCMDS)
    269 		return;
    270 	if (PRC_IS_REDIRECT(cmd))
    271 		notify = in6_rtchange, d = NULL;
    272 	else if (cmd == PRC_HOSTDEAD)
    273 		d = NULL;
    274 	else if (inet6ctlerrmap[cmd] == 0)
    275 		return;
    276 
    277 	/* if the parameter is from icmp6, decode it. */
    278 	if (d != NULL) {
    279 		struct ip6ctlparam *ip6cp = (struct ip6ctlparam *)d;
    280 		m = ip6cp->ip6c_m;
    281 		ip6 = ip6cp->ip6c_ip6;
    282 		off = ip6cp->ip6c_off;
    283 	} else {
    284 		m = NULL;
    285 		ip6 = NULL;
    286 	}
    287 
    288 	/* translate addresses into internal form */
    289 	sa6 = *(struct sockaddr_in6 *)sa;
    290 	if (IN6_IS_ADDR_LINKLOCAL(&sa6.sin6_addr) && m && m->m_pkthdr.rcvif)
    291 		sa6.sin6_addr.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
    292 
    293 	if (ip6) {
    294 		/*
    295 		 * XXX: We assume that when IPV6 is non NULL,
    296 		 * M and OFF are valid.
    297 		 */
    298 		struct in6_addr s;
    299 
    300 		/* translate addresses into internal form */
    301 		memcpy(&s, &ip6->ip6_src, sizeof(s));
    302 		if (IN6_IS_ADDR_LINKLOCAL(&s))
    303 			s.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
    304 
    305 		(void) in6_pcbnotify(&rawin6pcb, (struct sockaddr *)&sa6,
    306 					0, &s, 0, cmd, notify);
    307 	} else {
    308 		(void) in6_pcbnotify(&rawin6pcb, (struct sockaddr *)&sa6, 0,
    309 					&zeroin6_addr, 0, cmd, notify);
    310 	}
    311 }
    312 
    313 /*
    314  * Generate IPv6 header and pass packet to ip6_output.
    315  * Tack on options user may have setup with control call.
    316  */
    317 int
    318 #if __STDC__
    319 rip6_output(struct mbuf *m, ...)
    320 #else
    321 rip6_output(m, va_alist)
    322 	struct mbuf *m;
    323 	va_dcl
    324 #endif
    325 {
    326 	struct socket *so;
    327 	struct sockaddr_in6 *dstsock;
    328 	struct mbuf *control;
    329 	struct in6_addr *dst;
    330 	struct ip6_hdr *ip6;
    331 	struct in6pcb *in6p;
    332 	u_int	plen = m->m_pkthdr.len;
    333 	int error = 0;
    334 	struct ip6_pktopts opt, *optp = NULL;
    335 	struct ifnet *oifp = NULL;
    336 	int type, code;		/* for ICMPv6 output statistics only */
    337 	int priv = 0;
    338 	va_list ap;
    339 
    340 	va_start(ap, m);
    341 	so = va_arg(ap, struct socket *);
    342 	dstsock = va_arg(ap, struct sockaddr_in6 *);
    343 	control = va_arg(ap, struct mbuf *);
    344 	va_end(ap);
    345 
    346 	in6p = sotoin6pcb(so);
    347 
    348 	priv = 0;
    349     {
    350 	struct proc *p = curproc;	/* XXX */
    351 
    352 	if (p && !suser(p->p_ucred, &p->p_acflag))
    353 		priv = 1;
    354     }
    355 	dst = &dstsock->sin6_addr;
    356 	if (control) {
    357 		if ((error = ip6_setpktoptions(control, &opt, priv)) != 0)
    358 			goto bad;
    359 		optp = &opt;
    360 	} else
    361 		optp = in6p->in6p_outputopts;
    362 
    363 	/*
    364 	 * For an ICMPv6 packet, we should know its type and code
    365 	 * to update statistics.
    366 	 */
    367 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
    368 		struct icmp6_hdr *icmp6;
    369 		if (m->m_len < sizeof(struct icmp6_hdr) &&
    370 		    (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
    371 			error = ENOBUFS;
    372 			goto bad;
    373 		}
    374 		icmp6 = mtod(m, struct icmp6_hdr *);
    375 		type = icmp6->icmp6_type;
    376 		code = icmp6->icmp6_code;
    377 	}
    378 
    379 	M_PREPEND(m, sizeof(*ip6), M_WAIT);
    380 	ip6 = mtod(m, struct ip6_hdr *);
    381 
    382 	/*
    383 	 * Next header might not be ICMP6 but use its pseudo header anyway.
    384 	 */
    385 	ip6->ip6_dst = *dst;
    386 
    387 	/*
    388 	 * If the scope of the destination is link-local, embed the interface
    389 	 * index in the address.
    390 	 *
    391 	 * XXX advanced-api value overrides sin6_scope_id
    392 	 */
    393 	if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst) ||
    394 	    IN6_IS_ADDR_MC_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 		}
    405 		else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
    406 			 in6p->in6p_moptions &&
    407 			 in6p->in6p_moptions->im6o_multicast_ifp) {
    408 			oifp = in6p->in6p_moptions->im6o_multicast_ifp;
    409 			ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
    410 		} else if (dstsock->sin6_scope_id) {
    411 			/* boundary check */
    412 			if (dstsock->sin6_scope_id < 0
    413 			 || if_index < dstsock->sin6_scope_id) {
    414 				error = ENXIO;  /* XXX EINVAL? */
    415 				goto bad;
    416 			}
    417 			ip6->ip6_dst.s6_addr16[1]
    418 				= htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
    419 		}
    420 	}
    421 
    422 	/*
    423 	 * Source address selection.
    424 	 */
    425 	{
    426 		struct in6_addr *in6a;
    427 
    428 		if ((in6a = in6_selectsrc(dstsock, optp,
    429 					  in6p->in6p_moptions,
    430 					  &in6p->in6p_route,
    431 					  &in6p->in6p_laddr,
    432 					  &error)) == 0) {
    433 			if (error == 0)
    434 				error = EADDRNOTAVAIL;
    435 			goto bad;
    436 		}
    437 		ip6->ip6_src = *in6a;
    438 		if (in6p->in6p_route.ro_rt)
    439 			oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];
    440 	}
    441 
    442 	ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
    443 	ip6->ip6_vfc  &= ~IPV6_VERSION_MASK;
    444 	ip6->ip6_vfc  |= IPV6_VERSION;
    445 #if 0				/* ip6_plen will be filled in ip6_output. */
    446 	ip6->ip6_plen  = htons((u_short)plen);
    447 #endif
    448 	ip6->ip6_nxt   = in6p->in6p_ip6.ip6_nxt;
    449 	ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
    450 
    451 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
    452 	    in6p->in6p_cksum != -1) {
    453 		struct mbuf *n;
    454 		int off;
    455 		u_int16_t *p;
    456 
    457 #define	offsetof(type, member)	((size_t)(&((type *)0)->member)) /* XXX */
    458 
    459 		/* compute checksum */
    460 		if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
    461 			off = offsetof(struct icmp6_hdr, icmp6_cksum);
    462 		else
    463 			off = in6p->in6p_cksum;
    464 		if (plen < off + 1) {
    465 			error = EINVAL;
    466 			goto bad;
    467 		}
    468 		off += sizeof(struct ip6_hdr);
    469 
    470 		n = m;
    471 		while (n && n->m_len <= off) {
    472 			off -= n->m_len;
    473 			n = n->m_next;
    474 		}
    475 		if (!n)
    476 			goto bad;
    477 		p = (u_int16_t *)(mtod(n, caddr_t) + off);
    478 		*p = 0;
    479 		*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
    480 	}
    481 
    482 	error = ip6_output(m, optp, &in6p->in6p_route, 0, in6p->in6p_moptions,
    483 			   &oifp);
    484 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
    485 		if (oifp)
    486 			icmp6_ifoutstat_inc(oifp, type, code);
    487 		icmp6stat.icp6s_outhist[type]++;
    488 	}
    489 
    490 	goto freectl;
    491 
    492  bad:
    493 	if (m)
    494 		m_freem(m);
    495 
    496  freectl:
    497 	if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
    498 		RTFREE(optp->ip6po_route.ro_rt);
    499 	if (control)
    500 		m_freem(control);
    501 	return(error);
    502 }
    503 
    504 /*
    505  * Raw IPv6 socket option processing.
    506  */
    507 int
    508 rip6_ctloutput(op, so, level, optname, m)
    509 	int op;
    510 	struct socket *so;
    511 	int level, optname;
    512 	struct mbuf **m;
    513 {
    514 	int error = 0;
    515 
    516 	switch(level) {
    517 	 case IPPROTO_IPV6:
    518 		 switch(optname) {
    519 		  case MRT6_INIT:
    520 		  case MRT6_DONE:
    521 		  case MRT6_ADD_MIF:
    522 		  case MRT6_DEL_MIF:
    523 		  case MRT6_ADD_MFC:
    524 		  case MRT6_DEL_MFC:
    525 		  case MRT6_PIM:
    526 			  if (op == PRCO_SETOPT) {
    527 				  error = ip6_mrouter_set(optname, so, *m);
    528 				  if (*m)
    529 					  (void)m_free(*m);
    530 			  } else if (op == PRCO_GETOPT) {
    531 				  error = ip6_mrouter_get(optname, so, m);
    532 			  } else
    533 				  error = EINVAL;
    534 			  return (error);
    535 		 }
    536 		 return (ip6_ctloutput(op, so, level, optname, m));
    537 		 /* NOTREACHED */
    538 
    539 	 case IPPROTO_ICMPV6:
    540 		 /*
    541 		  * XXX: is it better to call icmp6_ctloutput() directly
    542 		  * from protosw?
    543 		  */
    544 		 return(icmp6_ctloutput(op, so, level, optname, m));
    545 
    546 	 default:
    547 		 if (op == PRCO_SETOPT && *m)
    548 			 (void)m_free(*m);
    549 		 return(EINVAL);
    550 	}
    551 }
    552 
    553 extern	u_long rip6_sendspace;
    554 extern	u_long rip6_recvspace;
    555 
    556 int
    557 rip6_usrreq(so, req, m, nam, control, p)
    558 	register struct socket *so;
    559 	int req;
    560 	struct mbuf *m, *nam, *control;
    561 	struct proc *p;
    562 {
    563 	register struct in6pcb *in6p = sotoin6pcb(so);
    564 	int s;
    565 	int error = 0;
    566 /*	extern	struct socket *ip6_mrouter; */ /* xxx */
    567 	int priv;
    568 
    569 	priv = 0;
    570 	if (p && !suser(p->p_ucred, &p->p_acflag))
    571 		priv++;
    572 
    573 	if (req == PRU_CONTROL)
    574 		return (in6_control(so, (u_long)m, (caddr_t)nam,
    575 				    (struct ifnet *)control, p));
    576 
    577 	if (req == PRU_PURGEIF) {
    578 		in6_purgeif((struct ifnet *)control);
    579 		in6_pcbpurgeif(&rawin6pcb, (struct ifnet *)control);
    580 		return (0);
    581 	}
    582 
    583 	switch (req) {
    584 	case PRU_ATTACH:
    585 		if (in6p)
    586 			panic("rip6_attach");
    587 		if (!priv) {
    588 			error = EACCES;
    589 			break;
    590 		}
    591 		s = splsoftnet();
    592 		if ((error = soreserve(so, rip6_sendspace, rip6_recvspace)) ||
    593 		    (error = in6_pcballoc(so, &rawin6pcb))) {
    594 			splx(s);
    595 			break;
    596 		}
    597 		splx(s);
    598 		in6p = sotoin6pcb(so);
    599 		in6p->in6p_ip6.ip6_nxt = (long)nam;
    600 		in6p->in6p_cksum = -1;
    601 #ifdef IPSEC
    602 		error = ipsec_init_policy(so, &in6p->in6p_sp);
    603 		if (error != 0) {
    604 			in6_pcbdetach(in6p);
    605 			break;
    606 		}
    607 #endif /*IPSEC*/
    608 
    609 		MALLOC(in6p->in6p_icmp6filt, struct icmp6_filter *,
    610 			sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
    611 		if (in6p->in6p_icmp6filt == NULL) {
    612 			in6_pcbdetach(in6p);
    613 			error = ENOMEM;
    614 			break;
    615 		}
    616 		ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt);
    617 		break;
    618 
    619 	case PRU_DISCONNECT:
    620 		if ((so->so_state & SS_ISCONNECTED) == 0) {
    621 			error = ENOTCONN;
    622 			break;
    623 		}
    624 		in6p->in6p_faddr = in6addr_any;
    625 		so->so_state &= ~SS_ISCONNECTED;	/* XXX */
    626 		break;
    627 
    628 	case PRU_ABORT:
    629 		soisdisconnected(so);
    630 		/* Fallthrough */
    631 	case PRU_DETACH:
    632 		if (in6p == 0)
    633 			panic("rip6_detach");
    634 		if (so == ip6_mrouter)
    635 			ip6_mrouter_done();
    636 		/* xxx: RSVP */
    637 		if (in6p->in6p_icmp6filt) {
    638 			FREE(in6p->in6p_icmp6filt, M_PCB);
    639 			in6p->in6p_icmp6filt = NULL;
    640 		}
    641 		in6_pcbdetach(in6p);
    642 		break;
    643 
    644 	case PRU_BIND:
    645 	    {
    646 		struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
    647 		struct ifaddr *ia = NULL;
    648 
    649 		if (nam->m_len != sizeof(*addr)) {
    650 			error = EINVAL;
    651 			break;
    652 		}
    653 
    654 		/*
    655 		 * we don't support mapped address here, it would confuse
    656 		 * users so reject it
    657 		 */
    658 		if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) {
    659 			error = EADDRNOTAVAIL;
    660 			break;
    661 		}
    662 
    663 		if ((ifnet.tqh_first == 0) ||
    664 		   (addr->sin6_family != AF_INET6) ||
    665 		   (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
    666 		    (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)) {
    667 			error = EADDRNOTAVAIL;
    668 			break;
    669 		}
    670 		if (ia &&
    671 		    ((struct in6_ifaddr *)ia)->ia6_flags &
    672 		    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
    673 		     IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
    674 			error = EADDRNOTAVAIL;
    675 			break;
    676 		}
    677 		in6p->in6p_laddr = addr->sin6_addr;
    678 		break;
    679 	    }
    680 
    681 	case PRU_CONNECT:
    682 	    {
    683 		struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
    684 		struct in6_addr *in6a = NULL;
    685 
    686 		if (nam->m_len != sizeof(*addr)) {
    687 			error = EINVAL;
    688 			break;
    689 		}
    690 		if (ifnet.tqh_first == 0) {
    691 			error = EADDRNOTAVAIL;
    692 			break;
    693 		}
    694 		if (addr->sin6_family != AF_INET6) {
    695 			error = EAFNOSUPPORT;
    696 			break;
    697 		}
    698 
    699 		/* Source address selection. XXX: need pcblookup? */
    700 		in6a = in6_selectsrc(addr, in6p->in6p_outputopts,
    701 				     in6p->in6p_moptions,
    702 				     &in6p->in6p_route,
    703 				     &in6p->in6p_laddr,
    704 				     &error);
    705 		if (in6a == NULL) {
    706 			if (error == 0)
    707 				error = EADDRNOTAVAIL;
    708 			break;
    709 		}
    710 		in6p->in6p_laddr = *in6a;
    711 		in6p->in6p_faddr = addr->sin6_addr;
    712 		soisconnected(so);
    713 		break;
    714 	    }
    715 
    716 	case PRU_CONNECT2:
    717 		error = EOPNOTSUPP;
    718 		break;
    719 
    720 	/*
    721 	 * Mark the connection as being incapable of futther input.
    722 	 */
    723 	case PRU_SHUTDOWN:
    724 		socantsendmore(so);
    725 		break;
    726 	/*
    727 	 * Ship a packet out. The appropriate raw output
    728 	 * routine handles any messaging necessary.
    729 	 */
    730 	case PRU_SEND:
    731 	    {
    732 		struct sockaddr_in6 tmp;
    733 		struct sockaddr_in6 *dst;
    734 
    735 		if (so->so_state & SS_ISCONNECTED) {
    736 			if (nam) {
    737 				error = EISCONN;
    738 				break;
    739 			}
    740 			/* XXX */
    741 			bzero(&tmp, sizeof(tmp));
    742 			tmp.sin6_family = AF_INET6;
    743 			tmp.sin6_len = sizeof(struct sockaddr_in6);
    744 			bcopy(&in6p->in6p_faddr, &tmp.sin6_addr,
    745 				sizeof(struct in6_addr));
    746 			dst = &tmp;
    747 		} else {
    748 			if (nam == NULL) {
    749 				error = ENOTCONN;
    750 				break;
    751 			}
    752 			dst = mtod(nam, struct sockaddr_in6 *);
    753 		}
    754 		error = rip6_output(m, so, dst, control);
    755 		m = NULL;
    756 		break;
    757 	    }
    758 
    759 	case PRU_SENSE:
    760 		/*
    761 		 * stat: don't bother with a blocksize
    762 		 */
    763 		return(0);
    764 	/*
    765 	 * Not supported.
    766 	 */
    767 	case PRU_RCVOOB:
    768 	case PRU_RCVD:
    769 	case PRU_LISTEN:
    770 	case PRU_ACCEPT:
    771 	case PRU_SENDOOB:
    772 		error = EOPNOTSUPP;
    773 		break;
    774 
    775 	case PRU_SOCKADDR:
    776 		in6_setsockaddr(in6p, nam);
    777 		break;
    778 
    779 	case PRU_PEERADDR:
    780 		in6_setpeeraddr(in6p, nam);
    781 		break;
    782 
    783 	default:
    784 		panic("rip6_usrreq");
    785 	}
    786 	if (m != NULL)
    787 		m_freem(m);
    788 	return(error);
    789 }
    790