path: root/sys/netinet6/raw_ipv6.c

/* $OpenBSD: raw_ipv6.c,v 1.12 2000/01/05 17:30:52 itojun Exp $ */
/*
%%% copyright-nrl-95
This software is Copyright 1995-1998 by Randall Atkinson, Ronald Lee,
Daniel McDonald, Bao Phan, and Chris Winters. All Rights Reserved. All
rights under this copyright have been assigned to the US Naval Research
Laboratory (NRL). The NRL Copyright Notice and License Agreement Version
1.1 (January 17, 1995) applies to this software.
You should have received a copy of the license with this software. If you
didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>.

*/
/*
 * Copyright (c) 1982, 1986, 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)raw_ip.c	8.7 (Berkeley) 5/15/95
 *	$Id: raw_ipv6.c,v 1.12 2000/01/05 17:30:52 itojun Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <net/if.h>
#include <net/route.h>

#include <netinet/in.h>
#include <netinet/ip_mroute.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>

#include <netinet6/in6_var.h>
#include <netinet6/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/icmp6.h>

#undef IPSEC

/*
 * Globals
 */

struct inpcbtable rawin6pcbtable;
struct sockaddr_in6 rip6src = { sizeof(struct sockaddr_in6), AF_INET6 };

/*
 * Nominal space allocated to a raw ip socket.
 */

#define	RIPV6SNDQ		8192
#define	RIPV6RCVQ		8192

#if 0
u_long rip6_sendspace = RIPV6SNDQ;
u_long rip6_recvspace = RIPV6RCVQ;
#else
extern u_long rip6_sendspace;
extern u_long rip6_recvspace;
#endif

/*
 * External globals
 */

#if 0
extern struct ip6_hdrstat ipv6stat;
#endif

/*----------------------------------------------------------------------
 * Raw IPv6 PCB initialization.
 ----------------------------------------------------------------------*/

void
rip6_init()
{
  in_pcbinit(&rawin6pcbtable, 1);
}

/* At the point where this function gets called, we don't know the nexthdr of
   the current header to be processed, only its offset. So we have to go find
   it the hard way. In the case where there's no chained headers, this is not
   really painful.

   The good news is that all fields have been sanity checked.

   Assumes m has already been pulled up by extra. -cmetz
*/
#if __GNUC__ && __GNUC__ >= 2 && __OPTIMIZE__
static __inline__ int ipv6_findnexthdr(struct mbuf *m, size_t extra)
#else /* __GNUC__ && __GNUC__ >= 2 && __OPTIMIZE__ */
static int ipv6_findnexthdr(struct mbuf *m, size_t extra)
#endif /* __GNUC__ && __GNUC__ >= 2 && __OPTIMIZE__ */
{
  caddr_t p = mtod(m, caddr_t);
  int nexthdr = IPPROTO_IPV6;
  unsigned int hl;

  do {
    switch(nexthdr) {
      case IPPROTO_IPV6:
	hl = sizeof(struct ip6_hdr);

	if ((extra -= hl) < 0)
	  return -1;

	nexthdr = ((struct ip6_hdr *)p)->ip6_nxt;
	break;
      case IPPROTO_HOPOPTS:
      case IPPROTO_DSTOPTS:
	if (extra < sizeof(struct ip6_ext))
	  return -1;

	hl = sizeof(struct ip6_ext) +
	     (((struct ip6_ext *)p)->ip6e_len << 3);

	if ((extra -= hl) < 0)
	  return -1;

	nexthdr = ((struct ip6_ext *)p)->ip6e_nxt;
	break;
      case IPPROTO_ROUTING:
	if (extra < sizeof(struct ip6_rthdr0))
	  return -1;

	hl = sizeof(struct ip6_rthdr0) +
	     (((struct ip6_rthdr0 *)p)->ip6r0_len << 3);

	if ((extra -= hl) < 0)
	  return -1;

	nexthdr = ((struct ip6_rthdr0 *)p)->ip6r0_nxt;
	break;
#ifdef IPSEC
      case IPPROTO_AH:
	if (extra < sizeof(struct ip6_hdr_srcroute0))
	  return -1;

	hl = sizeof(struct ip6_hdr_srcroute0) +
	     ((struct ip6_hdr_srcroute0 *)p)->i6sr_len << 3;

	if ((extra -= hl) < 0)
	  return -1;

	nexthdr = ((struct ip6_hdr_srcroute0 *)p)->i6sr_nexthdr;
	break;
#endif /* IPSEC */
      default:
	return -1;
    }
    p += hl;
  } while(extra > 0);

  return nexthdr;
}

/*----------------------------------------------------------------------
 * If no HLP's are found for an IPv6 datagram, this routine is called.
 ----------------------------------------------------------------------*/
int
rip6_input(mp, offp, proto)
     struct mbuf **mp;
     int *offp, proto;
{
  struct mbuf *m = *mp;
  register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); /* Will have been
							  pulled up by 
							  ipv6_input(). */
  register struct inpcb *inp;
  int nexthdr, icmp6type;
  int foundone = 0;
  struct mbuf *m2 = NULL, *opts = NULL;
  struct sockaddr_in6 srcsa;
#ifdef IPSEC
  struct sockaddr_in6 dstsa;
#endif /* IPSEC */
  int extra = *offp;

	/* Be proactive about malicious use of IPv4 mapped address */
	if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
	    IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
		/* XXX stat */
		goto ret;
	}

  bzero(&srcsa, sizeof(struct sockaddr_in6));
  srcsa.sin6_family = AF_INET6;
  srcsa.sin6_len = sizeof(struct sockaddr_in6);
  srcsa.sin6_addr = ip6->ip6_src;

	if (IN6_IS_SCOPE_LINKLOCAL(&srcsa.sin6_addr))
		srcsa.sin6_addr.s6_addr16[1] = 0;
	if (m->m_pkthdr.rcvif) {
		if (IN6_IS_SCOPE_LINKLOCAL(&srcsa.sin6_addr))
			srcsa.sin6_scope_id = m->m_pkthdr.rcvif->if_index;
		else
			srcsa.sin6_scope_id = 0;
	} else
		srcsa.sin6_scope_id = 0;

#if IPSEC
  bzero(&dstsa, sizeof(struct sockaddr_in6));
  dstsa.sin6_family = AF_INET6;
  dstsa.sin6_len = sizeof(struct sockaddr_in6);
  dstsa.sin6_addr = ip6->ip6_dst;
#endif /* IPSEC */

#if 0
  /* Will be done already by the previous input functions */
  if (m->m_len < extra)) {
	if (!(m = m_pullup2(m, extra)))
		return;
	ip6 = mtod(m, struct ip6_hdr *);
  }
#endif /* 0 */

  if ((nexthdr = ipv6_findnexthdr(m, extra)) < 0)
    goto ret;

  if (nexthdr == IPPROTO_ICMPV6) {
    if (m->m_len < extra + sizeof(struct icmp6_hdr)) {
      if (!(m = m_pullup2(m, extra + sizeof(struct icmp6_hdr))))
        goto ret;

      ip6 = mtod(m, struct ip6_hdr *);
    }
    icmp6type = ((struct icmp6_hdr *)(mtod(m, caddr_t) + extra))->icmp6_type;
  } else
    icmp6type = -1;

  /*
   * Locate raw PCB for incoming datagram.
   */
  for (inp = rawin6pcbtable.inpt_queue.cqh_first;
       inp != (struct inpcb *)&rawin6pcbtable.inpt_queue;
       inp = inp->inp_queue.cqe_next)
  {
    if (!(inp->inp_flags & INP_IPV6))
      continue;
    if (inp->inp_ipv6.ip6_nxt && inp->inp_ipv6.ip6_nxt != nexthdr)
      continue;
    if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) && 
	!IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, &ip6->ip6_dst))
      continue;
    if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6) && 
	!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, &ip6->ip6_src))
      continue;
    if (inp->inp_icmp6filt && 
	ICMP6_FILTER_WILLBLOCK(icmp6type, inp->inp_icmp6filt))
      continue;

    foundone = 1;

#ifdef IPSEC
    /* Perform input-side policy check. Drop packet if policy says to drop it.

       Note: For ICMPv6 packets, we also checked policy in ipv6_icmp_input().

       XXX - state arg should NOT be NULL, it should be the netproc state
       carried up the stack - cmetz */
    if (!netproc_inputpolicy(NULL, (struct sockaddr *)&srcsa,
	 (struct sockaddr *)&dstsa, nexthdr, m, NULL, NULL))
#endif /* IPSEC */

    /* Note the inefficiency here; this is a consequence of the interfaces of
       the functions being used. The raw code is not performance critical
       enough to require an immediate fix. - cmetz */
    if ((m2 = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT))) {
      m_adj(m2, extra);

      if (inp->inp_flags & IN6P_CONTROLOPTS)
	ip6_savecontrol(inp, &opts, ip6, m);
      else
        opts = NULL;
      if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&srcsa, m2,
                       opts)) {
        sorwakeup(inp->inp_socket);
      } else {
        m_freem(m2);
      };
    };
  };

  if (!foundone) {
    /*
     * We should send an ICMPv6 protocol unreachable here,
     * though original UCB 4.4-lite BSD's IPv4 does not do so.
     */
#if 0
    ipv6stat.ips_noproto++;
    ipv6stat.ips_delivered--;
#endif
  }

ret:
  if (m)
    m_freem(m);

  return IPPROTO_DONE;
}

/*----------------------------------------------------------------------
 * Output function for raw IPv6.  Called from rip6_usrreq(), and
 * ipv6_icmp_usrreq().
 ----------------------------------------------------------------------*/

int rip6_output(struct mbuf *m, ...)
{
  register struct ip6_hdr *ip6;
  register struct inpcb *inp;
  int flags;
  int error = 0;
#if 0
  struct ifnet *forceif = NULL;
#endif
  struct ip6_pktopts opt, *optp = NULL;
  struct ifnet *oifp = NULL;

  va_list ap;
  struct socket *so;
  struct sockaddr_in6 *dst;
  struct mbuf *control;

  va_start(ap, m);
  so = va_arg(ap, struct socket *);
  dst = va_arg(ap, struct sockaddr_in6 *);
  control = va_arg(ap, struct mbuf *);
  va_end(ap);

  inp = sotoinpcb(so);
  flags = (so->so_options & SO_DONTROUTE);

  if (control) {
    error = ip6_setpktoptions(control, &opt, so->so_state & SS_PRIV);
    if (error != 0)
      goto bad;
    optp = &opt;
  } else
    optp = NULL;

#if 0
  if (inp->inp_flags & INP_HDRINCL)
    {
      flags |= IPV6_RAWOUTPUT;
      ipv6stat.ips_rawout++;
      /* Maybe m_pullup() ipv6 header here for ipv6_output(), which
	 expects it to be contiguous. */
    }
  else
#endif
    {
      struct in6_addr *in6a;

      in6a = in6_selectsrc(dst, optp, inp->inp_moptions6,
		&inp->inp_route6, &inp->inp_laddr6, &error);
      if (in6a == NULL) {
	if (error == 0)
	  error = EADDRNOTAVAIL;
	goto bad;
      }

      M_PREPEND(m, sizeof(struct ip6_hdr), M_WAIT);
      ip6 = mtod(m, struct ip6_hdr *);
      ip6->ip6_flow = 0;  /* Or possibly user flow label, in host order. */
      ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
      ip6->ip6_vfc |= IPV6_VERSION;
      ip6->ip6_nxt = inp->inp_ipv6.ip6_nxt;
      bcopy(in6a, &ip6->ip6_src, sizeof(*in6a));
      ip6->ip6_dst = dst->sin6_addr;
      /*
       * Question:  How do I handle options?
       *
       * Answer:  I put them in here, but how?
       */
    }

	/*
	 * If the scope of the destination is link-local, embed the interface
	 * index in the address.
	 *
	 * XXX advanced-api value overrides sin6_scope_id 
	 */
	if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst) ||
	    IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) {
		struct in6_pktinfo *pi;

		/*
		 * XXX Boundary check is assumed to be already done in
		 * ip6_setpktoptions().
		 */
		if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
			ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
			oifp = ifindex2ifnet[pi->ipi6_ifindex];
		}
		else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
			 inp->inp_moptions6 &&
			 inp->inp_moptions6->im6o_multicast_ifp) {
			oifp = inp->inp_moptions6->im6o_multicast_ifp;
			ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
		} else if (dst->sin6_scope_id) {
			/* boundary check */
			if (dst->sin6_scope_id < 0 
			 || if_index < dst->sin6_scope_id) {
				error = ENXIO;  /* XXX EINVAL? */
				goto bad;
			}
			ip6->ip6_dst.s6_addr16[1]
				= htons(dst->sin6_scope_id & 0xffff);/*XXX*/
		}
	}

	ip6->ip6_hlim = in6_selecthlim(inp, oifp);

  {
    int payload = sizeof(struct ip6_hdr);
    int nexthdr = mtod(m, struct ip6_hdr *)->ip6_nxt;
#if 0
    int error;
#endif

    if (inp->inp_csumoffset >= 0) {
      uint16_t *csum;

      if (!(m = m_pullup2(m, payload + inp->inp_csumoffset))) {
	m_freem(m);
	return ENOBUFS;
      };

      csum = (uint16_t *)(mtod(m, uint8_t *) + payload + inp->inp_csumoffset);

      *csum = 0;
      *csum = in6_cksum(m, nexthdr, payload, m->m_pkthdr.len - payload);
    };
  };

  return ip6_output(m, optp, &inp->inp_route6, flags, inp->inp_moptions6, &oifp);

bad:
  if (m)
    m_freem(m);
  return error;
}

/*----------------------------------------------------------------------
 * Handles [gs]etsockopt() calls.
 ----------------------------------------------------------------------*/

int
rip6_ctloutput (op, so, level, optname, m)
     int op;
     struct socket *so;
     int level, optname;
     struct mbuf **m;
{
  register struct inpcb *inp = sotoinpcb(so);

  if ((level != IPPROTO_IPV6) && (level != IPPROTO_ICMPV6)) {
      if (op == PRCO_SETOPT && *m)
	(void)m_free(*m);
      return(EINVAL);
  }

  switch (optname) {
    case IPV6_CHECKSUM:
      if (op == PRCO_SETOPT || op == PRCO_GETOPT) {
        if (op == PRCO_SETOPT) {
          if (!m || !*m || (*m)->m_len != sizeof(int))
	    return(EINVAL);
          inp->inp_csumoffset = *(mtod(*m, int *));
          m_freem(*m);
        } else {
	  *m = m_get(M_WAIT, MT_SOOPTS);
          (*m)->m_len = sizeof(int);
          *(mtod(*m, int *)) = inp->inp_csumoffset;
        };
        return 0;
      };
      break;
    case ICMP6_FILTER:
      if (op == PRCO_SETOPT || op == PRCO_GETOPT) {
        if (op == PRCO_SETOPT) {
          if (!m || !*m || (*m)->m_len != sizeof(struct icmp6_filter))
	    return(EINVAL);
	  bcopy(mtod(*m, struct icmp6_filter *), inp->inp_icmp6filt,
		sizeof(struct icmp6_filter));
          m_freem(*m);
        } else {
	  *m = m_get(M_WAIT, MT_SOOPTS);
          (*m)->m_len = sizeof(struct icmp6_filter);
          *mtod(*m, struct icmp6_filter *) = *inp->inp_icmp6filt;
        };
        return 0;
      };
      break;

    default:
      break;
  }
  return ip6_ctloutput(op, so, level, optname, m);
}

#if __GNUC__ && __GNUC__ >= 2 && __OPTIMIZE__
#define MAYBESTATIC static
#define MAYBEINLINE __inline__
#else /* __GNUC__ && __GNUC__ >= 2 && __OPTIMIZE__ */
#define MAYBESTATIC
#define MAYBEINLINE
#endif /* __GNUC__ && __GNUC__ >= 2 && __OPTIMIZE__ */

MAYBESTATIC MAYBEINLINE int rip6_usrreq_attach(struct socket *so, int proto)
{
  register struct inpcb *inp = sotoinpcb(so);
  register int error = 0;

  if (inp)
     panic("rip6_attach - Already got PCB");

  if ((so->so_state & SS_PRIV) == 0)
  {
    error = EACCES;
    return error;
  }
  if ((error = soreserve(so, rip6_sendspace, rip6_recvspace)) ||
      (error = in_pcballoc(so, &rawin6pcbtable)))

     return error;
     
  inp = sotoinpcb(so);
#ifdef	__alpha__
  inp->inp_ipv6.ip6_nxt = (u_long)proto;     /*nam;  Nam contains protocol
						 type, apparently. */
#else
  inp->inp_ipv6.ip6_nxt = (int)proto;     /*nam;   Nam contains protocol
						 type, apparently. */
#endif
  if (inp->inp_ipv6.ip6_nxt == IPPROTO_ICMPV6)
     inp->inp_csumoffset = 2;
  inp->inp_icmp6filt = (struct icmp6_filter *)
    malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  ICMP6_FILTER_SETPASSALL(inp->inp_icmp6filt);
  return error;
}

MAYBESTATIC MAYBEINLINE int rip6_usrreq_detach(struct socket *so)
{
  register struct inpcb *inp = sotoinpcb(so);

  if (inp == 0)
     panic("rip6_detach");
#ifdef MROUTING
      /* More MROUTING stuff. */
#endif
  if (inp->inp_icmp6filt) {
    free(inp->inp_icmp6filt, M_PCB);
    inp->inp_icmp6filt = NULL;
  }
  in_pcbdetach(inp);
  return 0;
}

MAYBESTATIC MAYBEINLINE int rip6_usrreq_abort(struct socket *so)
{
   soisdisconnected(so);
   return rip6_usrreq_detach(so);
}

static MAYBEINLINE int rip6_usrreq_disconnect(struct socket *so)
{ 
   if ((so->so_state & SS_ISCONNECTED) == 0)
      return ENOTCONN;
   return rip6_usrreq_abort(so);
}

MAYBESTATIC MAYBEINLINE int rip6_usrreq_bind(struct socket *so,
					      struct sockaddr *nam)
{
  register struct inpcb *inp = sotoinpcb(so);
  register struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;

   /* 'ifnet' is declared in one of the net/ header files. */
   if ((ifnet.tqh_first == 0) ||
       (addr->sin6_family != AF_INET6) ||    /* I only allow AF_INET6 */
       (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
        ifa_ifwithaddr((struct sockaddr *)addr) == 0 ) )

          return EADDRNOTAVAIL;

   inp->inp_laddr6 = addr->sin6_addr;
   return 0; 
}

MAYBESTATIC MAYBEINLINE int rip6_usrreq_connect(struct socket *so,
						 struct sockaddr *nam)
{
  register struct inpcb *inp = sotoinpcb(so);
  register struct sockaddr_in6 *addr = (struct sockaddr_in6 *) nam;
  int error;
  struct in6_addr *in6a;

   if (addr->sin6_family != AF_INET6)
       return EAFNOSUPPORT;

	in6a = in6_selectsrc(addr, inp->inp_outputopts6,
		inp->inp_moptions6, &inp->inp_route6, &inp->inp_laddr6,
		&error);
	if (in6a == NULL) {
		if (error == 0)
			error = EADDRNOTAVAIL;
		return error;
	}
	inp->inp_laddr6 = *in6a;

   inp->inp_faddr6 = addr->sin6_addr;  /* Will structure assignment
				          work with this compiler? */
   soisconnected(so);
   return 0;
}

MAYBESTATIC MAYBEINLINE int rip6_usrreq_shutdown(struct socket *so)
{ 
  socantsendmore(so);
  return 0;
}

static int rip6_usrreq_send __P((struct socket *so, int flags, struct mbuf *m,
                      struct sockaddr *addr, struct mbuf *control));

static int rip6_usrreq_send(struct socket *so, int flags, struct mbuf *m,
                      struct sockaddr *addr, struct mbuf *control)
{
  register struct inpcb *inp = sotoinpcb(so);
  register int error = 0;
  struct sockaddr_in6 *dst, tmp;

   if (inp == 0) {
      m_freem(m);
      return EINVAL;
   }

   /*
    * Check "connected" status, and if there is a supplied destination
    * address.
    */
   if (so->so_state & SS_ISCONNECTED)
     {
       if (addr)
	   return EISCONN;

       bzero(&tmp, sizeof(tmp));
       tmp.sin6_family = AF_INET6;
       tmp.sin6_len = sizeof(tmp);
       tmp.sin6_addr = inp->inp_faddr6;
       dst = &tmp;
     }
   else
     {
       if (addr == NULL)
	   return ENOTCONN;

       dst = (struct sockaddr_in6 *)addr;
     }

   error = rip6_output(m,so,dst,control);
   /* m = NULL; */
   return error;
}

MAYBESTATIC MAYBEINLINE int rip6_usrreq_control(struct socket *so, u_long cmd,
                                               caddr_t data, struct ifnet *ifp)
{ 
/* Notice that IPv4 raw sockets don't pass PRU_CONTROL.  I wonder
   if they panic as well? */
      return in6_control(so, cmd, data, ifp, 0);
}

MAYBESTATIC MAYBEINLINE int rip6_usrreq_sense(struct socket *so,
                                               struct stat *sb)
{ 
  /* services stat(2) call. */
  return 0;
}

MAYBESTATIC MAYBEINLINE int rip6_usrreq_sockaddr(struct socket *so,
                                                  struct mbuf *nam)
{
  register struct inpcb *inp = sotoinpcb(so);
  return in6_setsockaddr(inp, nam);
}

MAYBESTATIC MAYBEINLINE int rip6_usrreq_peeraddr(struct socket *so,
                                                  struct mbuf *nam)
{
  register struct inpcb *inp = sotoinpcb(so);
  return in6_setpeeraddr(inp, nam);
}

/*----------------------------------------------------------------------
 * Handles PRU_* for raw IPv6 sockets.
 ----------------------------------------------------------------------*/
int
rip6_usrreq(so, req, m, nam, control, p)
     struct socket *so;
     int req;
     struct mbuf *m, *nam, *control;
     struct proc *p;
{
  register int error = 0;

#ifdef MROUTING
  /*
   * Ummm, like, multicast routing stuff goes here, huh huh huh.
   *
   * Seriously, this would be for user-level multicast routing daemons.  With
   * multicast being a requirement for IPv6, code like what might go here
   * may go away.
   */
#endif

  switch (req)
    {
    case PRU_ATTACH:
      error = rip6_usrreq_attach(so, (long)nam);
      break;
    case PRU_DISCONNECT:
      error = rip6_usrreq_disconnect(so);
      break;
      /* NOT */
      /* FALLTHROUGH */
    case PRU_ABORT:
      error = rip6_usrreq_abort(so);
      break;
      /* NOT */
      /* FALLTHROUGH */
    case PRU_DETACH:
      error = rip6_usrreq_detach(so);
      break;
    case PRU_BIND:
      if (nam->m_len != sizeof(struct sockaddr_in6))
         return EINVAL;
      /*
       * Be strict regarding sockaddr_in6 fields.
       */
      error = rip6_usrreq_bind(so, mtod(nam, struct sockaddr *));
      break;
    case PRU_CONNECT:
      /*
       * Be strict regarding sockaddr_in6 fields.
       */
      if (nam->m_len != sizeof(struct sockaddr_in6))
          return EINVAL;
      error = rip6_usrreq_connect(so, mtod(nam, struct sockaddr *));
      break;
    case PRU_SHUTDOWN:
      error = rip6_usrreq_shutdown(so);
      break;
    case PRU_SEND:
      /*
       * Be strict regarding sockaddr_in6 fields.
       */
      if (nam->m_len != sizeof(struct sockaddr_in6))
          return EINVAL;
      error = rip6_usrreq_send(so, 0, m, mtod(nam, struct sockaddr *), control);
      m = NULL;
      break;
    case PRU_CONTROL:
      return rip6_usrreq_control(so, (u_long)m, (caddr_t) nam, 
                               (struct ifnet *) control);
    case PRU_SENSE:
      return rip6_usrreq_sense(so, NULL); /* XXX */
    case PRU_CONNECT2:
    case PRU_RCVOOB:
    case PRU_LISTEN:
    case PRU_SENDOOB:
    case PRU_RCVD:
    case PRU_ACCEPT:
      error = EOPNOTSUPP;
      break;
    case PRU_SOCKADDR:
      error = rip6_usrreq_sockaddr(so, nam);
      break;
    case PRU_PEERADDR:
      error = rip6_usrreq_peeraddr(so, nam);
      break;
    default:
      panic ("rip6_usrreq - unknown req\n");
    }
  if (m != NULL)
    m_freem(m);
  return error;
}