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raw_ip6.c revision 1.11
      1 /*	$NetBSD: raw_ip6.c,v 1.11 1999/09/13 12:15:56 itojun Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the project nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Copyright (c) 1982, 1986, 1988, 1993
     34  *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
     45  *    must display the following acknowledgement:
     46  *	This product includes software developed by the University of
     47  *	California, Berkeley and its contributors.
     48  * 4. Neither the name of the University nor the names of its contributors
     49  *    may be used to endorse or promote products derived from this software
     50  *    without specific prior written permission.
     51  *
     52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     62  * SUCH DAMAGE.
     63  *
     64  *	@(#)raw_ip.c	8.2 (Berkeley) 1/4/94
     65  */
     66 
     67 #ifdef __NetBSD__	/*XXX*/
     68 #include "opt_ipsec.h"
     69 #endif
     70 
     71 #include <sys/param.h>
     72 #include <sys/malloc.h>
     73 #include <sys/mbuf.h>
     74 #include <sys/socket.h>
     75 #include <sys/protosw.h>
     76 #include <sys/socketvar.h>
     77 #include <sys/errno.h>
     78 #include <sys/systm.h>
     79 #ifdef __NetBSD__
     80 #include <sys/proc.h>
     81 #endif
     82 
     83 #include <net/if.h>
     84 #include <net/route.h>
     85 #include <net/if_types.h>
     86 
     87 #include <netinet/in.h>
     88 #include <netinet/in_var.h>
     89 #include <netinet6/ip6.h>
     90 #include <netinet6/ip6_var.h>
     91 #include <netinet6/ip6_mroute.h>
     92 #include <netinet6/icmp6.h>
     93 #include <netinet6/in6_pcb.h>
     94 #include <netinet6/nd6.h>
     95 
     96 #ifdef IPSEC
     97 #include <netinet6/ipsec.h>
     98 #endif /*IPSEC*/
     99 
    100 #include <machine/stdarg.h>
    101 
    102 #include "faith.h"
    103 
    104 struct	in6pcb rawin6pcb;
    105 #define ifatoia6(ifa)	((struct in6_ifaddr *)(ifa))
    106 
    107 /*
    108  * Raw interface to IP6 protocol.
    109  */
    110 
    111 /*
    112  * Initialize raw connection block queue.
    113  */
    114 void
    115 rip6_init()
    116 {
    117 	rawin6pcb.in6p_next = rawin6pcb.in6p_prev = &rawin6pcb;
    118 }
    119 
    120 /*
    121  * Setup generic address and protocol structures
    122  * for raw_input routine, then pass them along with
    123  * mbuf chain.
    124  */
    125 int
    126 rip6_input(mp, offp, proto)
    127 	struct	mbuf **mp;
    128 	int	*offp, proto;
    129 {
    130 	struct mbuf *m = *mp;
    131 	register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
    132 	register struct in6pcb *in6p;
    133 	struct in6pcb *last = NULL;
    134 	struct sockaddr_in6 rip6src;
    135 	struct mbuf *opts = NULL;
    136 
    137 #if defined(NFAITH) && 0 < NFAITH
    138 	if (m->m_pkthdr.rcvif) {
    139 		if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
    140 			/* send icmp6 host unreach? */
    141 			m_freem(m);
    142 			return IPPROTO_DONE;
    143 		}
    144 	}
    145 #endif
    146 	bzero(&rip6src, sizeof(rip6src));
    147 	rip6src.sin6_len = sizeof(struct sockaddr_in6);
    148 	rip6src.sin6_family = AF_INET6;
    149 	rip6src.sin6_addr = ip6->ip6_src;
    150 	if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
    151 		rip6src.sin6_addr.s6_addr16[1] = 0;
    152 	if (m->m_pkthdr.rcvif) {
    153 		if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
    154 			rip6src.sin6_scope_id = m->m_pkthdr.rcvif->if_index;
    155 		else
    156 			rip6src.sin6_scope_id = 0;
    157 	} else
    158 		rip6src.sin6_scope_id = 0;
    159 
    160 	for (in6p = rawin6pcb.in6p_next;
    161 	     in6p != &rawin6pcb; in6p = in6p->in6p_next) {
    162 		if (in6p->in6p_ip6.ip6_nxt &&
    163 		    in6p->in6p_ip6.ip6_nxt != proto)
    164 			continue;
    165 		if (!IN6_IS_ADDR_ANY(&in6p->in6p_laddr) &&
    166 		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
    167 			continue;
    168 		if (!IN6_IS_ADDR_ANY(&in6p->in6p_faddr) &&
    169 		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
    170 			continue;
    171 		if (in6p->in6p_cksum != -1
    172 		 && in6_cksum(m, ip6->ip6_nxt, *offp, m->m_pkthdr.len - *offp))
    173 		{
    174 			/* XXX bark something */
    175 			continue;
    176 		}
    177 		if (last) {
    178 			struct	mbuf *n;
    179 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
    180 				if (last->in6p_flags & IN6P_CONTROLOPTS)
    181 					ip6_savecontrol(last, &opts, ip6, n);
    182 				/* strip intermediate headers */
    183 				m_adj(n, *offp);
    184 				if (sbappendaddr(&last->in6p_socket->so_rcv,
    185 						(struct sockaddr *)&rip6src,
    186 						 n, opts) == 0) {
    187 					/* should notify about lost packet */
    188 					m_freem(n);
    189 					if (opts)
    190 						m_freem(opts);
    191 				} else
    192 					sorwakeup(last->in6p_socket);
    193 				opts = NULL;
    194 			}
    195 		}
    196 		last = in6p;
    197 	}
    198 	if (last) {
    199 		if (last->in6p_flags & IN6P_CONTROLOPTS)
    200 			ip6_savecontrol(last, &opts, ip6, m);
    201 		/* strip intermediate headers */
    202 		m_adj(m, *offp);
    203 		if (sbappendaddr(&last->in6p_socket->so_rcv,
    204 				(struct sockaddr *)&rip6src, m, opts) == 0) {
    205 			m_freem(m);
    206 			if (opts)
    207 				m_freem(opts);
    208 		} else
    209 			sorwakeup(last->in6p_socket);
    210 	} else {
    211 		if (proto == IPPROTO_NONE)
    212 			m_freem(m);
    213 		else {
    214 			char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
    215 			icmp6_error(m, ICMP6_PARAM_PROB,
    216 				    ICMP6_PARAMPROB_NEXTHEADER,
    217 				    prvnxtp - mtod(m, char *));
    218 		}
    219 		ip6stat.ip6s_delivered--;
    220 	}
    221 	return IPPROTO_DONE;
    222 }
    223 
    224 /*
    225  * Generate IPv6 header and pass packet to ip6_output.
    226  * Tack on options user may have setup with control call.
    227  */
    228 int
    229 #if __STDC__
    230 rip6_output(struct mbuf *m, ...)
    231 #else
    232 rip6_output(m, va_alist)
    233 	struct mbuf *m;
    234 	va_dcl
    235 #endif
    236 {
    237 	struct socket *so;
    238 	struct sockaddr_in6 *dstsock;
    239 	struct mbuf *control;
    240 	struct in6_addr *dst;
    241 	struct ip6_hdr *ip6;
    242 	struct in6pcb *in6p;
    243 	u_int	plen = m->m_pkthdr.len;
    244 	int error = 0;
    245 	struct ip6_pktopts opt, *optp = NULL;
    246 	struct ifnet *oifp = NULL;
    247 	int priv = 0;
    248 	va_list ap;
    249 
    250 	va_start(ap, m);
    251 	so = va_arg(ap, struct socket *);
    252 	dstsock = va_arg(ap, struct sockaddr_in6 *);
    253 	control = va_arg(ap, struct mbuf *);
    254 	va_end(ap);
    255 
    256 	in6p = sotoin6pcb(so);
    257 
    258 	{
    259 		struct proc *p = curproc;	/* XXX */
    260 
    261 		if (p && !suser(p->p_ucred, &p->p_acflag))
    262 			priv = 1;
    263 	}
    264 	dst = &dstsock->sin6_addr;
    265 	if (control) {
    266 		if ((error = ip6_setpktoptions(control, &opt, priv)) != 0)
    267 			goto bad;
    268 		optp = &opt;
    269 	} else
    270 		optp = in6p->in6p_outputopts;
    271 
    272 	M_PREPEND(m, sizeof(*ip6), M_WAIT);
    273 	ip6 = mtod(m, struct ip6_hdr *);
    274 
    275 	/*
    276 	 * Next header might not be ICMP6 but use its pseudo header anyway.
    277 	 */
    278 	ip6->ip6_dst = *dst;
    279 
    280 	/*
    281 	 * If the scope of the destination is link-local, embed the interface
    282 	 * index in the address.
    283 	 *
    284 	 * XXX advanced-api value overrides sin6_scope_id
    285 	 */
    286 	if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
    287 		struct in6_pktinfo *pi;
    288 
    289 		/*
    290 		 * XXX Boundary check is assumed to be already done in
    291 		 * in6_setpktoptions().
    292 		 */
    293 		if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
    294 			ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
    295 			oifp = ifindex2ifnet[pi->ipi6_ifindex];
    296 		}
    297 		else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
    298 			 in6p->in6p_moptions &&
    299 			 in6p->in6p_moptions->im6o_multicast_ifp) {
    300 			ip6->ip6_dst.s6_addr16[1] =
    301 				htons(in6p->in6p_moptions->im6o_multicast_ifp->if_index);
    302 			oifp = ifindex2ifnet[in6p->in6p_moptions->im6o_multicast_ifp->if_index];
    303 		} else if (dstsock->sin6_scope_id) {
    304 			/* boundary check */
    305 			if (dstsock->sin6_scope_id < 0
    306 			 || if_index < dstsock->sin6_scope_id) {
    307 				error = ENXIO;  /* XXX EINVAL? */
    308 				goto bad;
    309 			}
    310 			ip6->ip6_dst.s6_addr16[1]
    311 				= htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
    312 		}
    313 	}
    314 
    315 	if (IN6_IS_ADDR_ANY(&in6p->in6p_laddr)) {
    316 		struct in6_addr *in6a;
    317 
    318 		if ((in6a = in6_selectsrc(dstsock, optp,
    319 					  in6p->in6p_moptions,
    320 					  &in6p->in6p_route,
    321 					  &error)) == 0) {
    322 			if (error == 0)
    323 				error = EADDRNOTAVAIL;
    324 			goto bad;
    325 		}
    326 		ip6->ip6_src = *in6a;
    327 		if (in6p->in6p_route.ro_rt)
    328 			oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];
    329 	} else
    330 		ip6->ip6_src = in6p->in6p_laddr;
    331 
    332 	ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
    333 	ip6->ip6_vfc  = IPV6_VERSION;
    334 #if 0				/* ip6_plen will be filled in ip6_output. */
    335 	ip6->ip6_plen  = htons((u_short)plen);
    336 #endif
    337 	ip6->ip6_nxt   = in6p->in6p_ip6.ip6_nxt;
    338 	if (oifp)
    339 		ip6->ip6_hlim = nd_ifinfo[oifp->if_index].chlim;
    340 	else
    341 		ip6->ip6_hlim = in6p->in6p_ip6.ip6_hlim;
    342 
    343 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
    344 	    in6p->in6p_cksum != -1) {
    345 		struct mbuf *n;
    346 		int off;
    347 		u_int16_t *p;
    348 
    349 #define	offsetof(type, member)	((size_t)(&((type *)0)->member)) /* XXX */
    350 
    351 		/* compute checksum */
    352 		if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
    353 			off = offsetof(struct icmp6_hdr, icmp6_cksum);
    354 		else
    355 			off = in6p->in6p_cksum;
    356 		if (plen < off + 1) {
    357 			error = EINVAL;
    358 			goto bad;
    359 		}
    360 		off += sizeof(struct ip6_hdr);
    361 
    362 		n = m;
    363 		while (n && n->m_len <= off) {
    364 			off -= n->m_len;
    365 			n = n->m_next;
    366 		}
    367 		if (!n)
    368 			goto bad;
    369 		p = (u_int16_t *)(mtod(n, caddr_t) + off);
    370 		*p = 0;
    371 		*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
    372 	}
    373 
    374 #ifdef IPSEC
    375 	m->m_pkthdr.rcvif = (struct ifnet *)so;
    376 #endif /*IPSEC*/
    377 
    378 	error = ip6_output(m, optp, &in6p->in6p_route, 0, in6p->in6p_moptions);
    379 	goto freectl;
    380 
    381  bad:
    382 	if (m)
    383 		m_freem(m);
    384 
    385  freectl:
    386 	if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
    387 		RTFREE(optp->ip6po_route.ro_rt);
    388 	if (control)
    389 		m_freem(control);
    390 	return(error);
    391 }
    392 
    393 /*
    394  * Raw IPv6 socket option processing.
    395  */
    396 int
    397 rip6_ctloutput(op, so, level, optname, m)
    398 	int op;
    399 	struct socket *so;
    400 	int level, optname;
    401 	struct mbuf **m;
    402 {
    403 	int error = 0;
    404 
    405 	switch(level) {
    406 	 case IPPROTO_IPV6:
    407 		 switch(optname) {
    408 		  case MRT6_INIT:
    409 		  case MRT6_DONE:
    410 		  case MRT6_ADD_MIF:
    411 		  case MRT6_DEL_MIF:
    412 		  case MRT6_ADD_MFC:
    413 		  case MRT6_DEL_MFC:
    414 		  case MRT6_PIM:
    415 			  if (op == PRCO_SETOPT) {
    416 				  error = ip6_mrouter_set(optname, so, *m);
    417 				  if (*m)
    418 					  (void)m_free(*m);
    419 			  } else if (op == PRCO_GETOPT) {
    420 				  error = ip6_mrouter_get(optname, so, m);
    421 			  } else
    422 				  error = EINVAL;
    423 			  return (error);
    424 		 }
    425 		 return (ip6_ctloutput(op, so, level, optname, m));
    426 		 /* NOTREACHED */
    427 
    428 	 case IPPROTO_ICMPV6:
    429 		 /*
    430 		  * XXX: is it better to call icmp6_ctloutput() directly
    431 		  * from protosw?
    432 		  */
    433 		 return(icmp6_ctloutput(op, so, level, optname, m));
    434 
    435 	 default:
    436 		 if (op == PRCO_SETOPT && *m)
    437 			 (void)m_free(*m);
    438 		 return(EINVAL);
    439 	}
    440 }
    441 
    442 extern	u_long rip6_sendspace;
    443 extern	u_long rip6_recvspace;
    444 
    445 int
    446 rip6_usrreq(so, req, m, nam, control, p)
    447 	register struct socket *so;
    448 	int req;
    449 	struct mbuf *m, *nam, *control;
    450 	struct proc *p;
    451 {
    452 	register struct in6pcb *in6p = sotoin6pcb(so);
    453 	int s;
    454 	int error = 0;
    455 /*	extern	struct socket *ip6_mrouter; */ /* xxx */
    456 
    457 	if (req == PRU_CONTROL)
    458 		return (in6_control(so, (u_long)m, (caddr_t)nam,
    459 				    (struct ifnet *)control, p));
    460 
    461 	switch (req) {
    462 	case PRU_ATTACH:
    463 		if (in6p)
    464 			panic("rip6_attach");
    465 		if (p == 0 || suser(p->p_ucred, &p->p_acflag)) {
    466 			error = EACCES;
    467 			break;
    468 		}
    469 		s = splsoftnet();
    470 		if ((error = soreserve(so, rip6_sendspace, rip6_recvspace)) ||
    471 		    (error = in6_pcballoc(so, &rawin6pcb))) {
    472 			splx(s);
    473 			break;
    474 		}
    475 		splx(s);
    476 		in6p = sotoin6pcb(so);
    477 		in6p->in6p_ip6.ip6_nxt = (long)nam;
    478 		in6p->in6p_ip6.ip6_hlim = ip6_defhlim;
    479 		in6p->in6p_cksum = -1;
    480 #ifdef IPSEC
    481 		if ((error = ipsec_init_policy(&in6p->in6p_sp)) != 0) {
    482 			in6_pcbdetach(in6p);
    483 			break;
    484 		}
    485 #endif /*IPSEC*/
    486 
    487 		MALLOC(in6p->in6p_icmp6filt, struct icmp6_filter *,
    488 			sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
    489 		ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt);
    490 		break;
    491 
    492 	case PRU_DISCONNECT:
    493 		if ((so->so_state & SS_ISCONNECTED) == 0) {
    494 			error = ENOTCONN;
    495 			break;
    496 		}
    497 		in6p->in6p_faddr = in6addr_any;
    498 		so->so_state &= ~SS_ISCONNECTED;	/* XXX */
    499 		break;
    500 
    501 	case PRU_ABORT:
    502 		soisdisconnected(so);
    503 		/* Fallthrough */
    504 	case PRU_DETACH:
    505 		if (in6p == 0)
    506 			panic("rip6_detach");
    507 		if (so == ip6_mrouter)
    508 			ip6_mrouter_done();
    509 		/* xxx: RSVP */
    510 		if (in6p->in6p_icmp6filt) {
    511 			FREE(in6p->in6p_icmp6filt, M_PCB);
    512 			in6p->in6p_icmp6filt = NULL;
    513 		}
    514 		in6_pcbdetach(in6p);
    515 		break;
    516 
    517 	case PRU_BIND:
    518 	    {
    519 		struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
    520 		struct ifaddr *ia = NULL;
    521 
    522 		if (nam->m_len != sizeof(*addr)) {
    523 			error = EINVAL;
    524 			break;
    525 		}
    526 		if ((ifnet.tqh_first == 0) ||
    527 		   (addr->sin6_family != AF_INET6) ||
    528 		   (!IN6_IS_ADDR_ANY(&addr->sin6_addr) &&
    529 		    (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)) {
    530 			error = EADDRNOTAVAIL;
    531 			break;
    532 		}
    533 		if (ia &&
    534 		    ((struct in6_ifaddr *)ia)->ia6_flags &
    535 		    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
    536 		     IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
    537 			error = EADDRNOTAVAIL;
    538 			break;
    539 		}
    540 		in6p->in6p_laddr = addr->sin6_addr;
    541 		break;
    542 	    }
    543 
    544 	case PRU_CONNECT:
    545 	    {
    546 		struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
    547 		struct in6_addr *in6a = NULL;
    548 
    549 		if (nam->m_len != sizeof(*addr)) {
    550 			error = EINVAL;
    551 			break;
    552 		}
    553 		if (ifnet.tqh_first == 0) {
    554 			error = EADDRNOTAVAIL;
    555 			break;
    556 		}
    557 		if (addr->sin6_family != AF_INET6) {
    558 			error = EAFNOSUPPORT;
    559 			break;
    560 		}
    561 
    562 		/* Source address selection. XXX: need pcblookup? */
    563 		in6a = &in6p->in6p_laddr;
    564 		if (IN6_IS_ADDR_ANY(in6a) &&
    565 		    (in6a = in6_selectsrc(addr, in6p->in6p_outputopts,
    566 					  in6p->in6p_moptions, &in6p->in6p_route,
    567 					  &error)) == NULL) {
    568 			if (error == 0)
    569 				error = EADDRNOTAVAIL;
    570 			break;
    571 		}
    572 		in6p->in6p_laddr = *in6a;
    573 		in6p->in6p_faddr = addr->sin6_addr;
    574 		soisconnected(so);
    575 		break;
    576 	    }
    577 
    578 	case PRU_CONNECT2:
    579 		error = EOPNOTSUPP;
    580 		break;
    581 
    582 	/*
    583 	 * Mark the connection as being incapable of futther input.
    584 	 */
    585 	case PRU_SHUTDOWN:
    586 		socantsendmore(so);
    587 		break;
    588 	/*
    589 	 * Ship a packet out. The appropriate raw output
    590 	 * routine handles any messaging necessary.
    591 	 */
    592 	case PRU_SEND:
    593 	    {
    594 		struct sockaddr_in6 tmp;
    595 		struct sockaddr_in6 *dst;
    596 
    597 		if (so->so_state & SS_ISCONNECTED) {
    598 			if (nam) {
    599 				error = EISCONN;
    600 				break;
    601 			}
    602 			/* XXX */
    603 			bzero(&tmp, sizeof(tmp));
    604 			tmp.sin6_family = AF_INET6;
    605 			tmp.sin6_len = sizeof(struct sockaddr_in6);
    606 			bcopy(&in6p->in6p_faddr, &tmp.sin6_addr,
    607 				sizeof(struct in6_addr));
    608 			dst = &tmp;
    609 		} else {
    610 			if (nam == NULL) {
    611 				error = ENOTCONN;
    612 				break;
    613 			}
    614 			dst = mtod(nam, struct sockaddr_in6 *);
    615 		}
    616 		error = rip6_output(m, so, dst, control);
    617 		m = NULL;
    618 		break;
    619 	    }
    620 
    621 	case PRU_SENSE:
    622 		/*
    623 		 * stat: don't bother with a blocksize
    624 		 */
    625 		return(0);
    626 	/*
    627 	 * Not supported.
    628 	 */
    629 	case PRU_RCVOOB:
    630 	case PRU_RCVD:
    631 	case PRU_LISTEN:
    632 	case PRU_ACCEPT:
    633 	case PRU_SENDOOB:
    634 		error = EOPNOTSUPP;
    635 		break;
    636 
    637 	case PRU_SOCKADDR:
    638 		in6_setsockaddr(in6p, nam);
    639 		break;
    640 
    641 	case PRU_PEERADDR:
    642 		in6_setpeeraddr(in6p, nam);
    643 		break;
    644 
    645 	default:
    646 		panic("rip6_usrreq");
    647 	}
    648 	if (m != NULL)
    649 		m_freem(m);
    650 	return(error);
    651 }
    652