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/* $OpenBSD: if_atm.c,v 1.2 1996/06/21 21:35:19 chuck Exp $ */
/*
*
* Copyright (c) 1996 Charles D. Cranor and Washington University.
* 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 Charles D. Cranor and
* Washington University.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* IP <=> ATM address resolution.
*/
#ifdef INET
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/syslog.h>
#include <sys/proc.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/if_atm.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_atm.h>
#define SDL(s) ((struct sockaddr_dl *)s)
/*
* atm_rtrequest: handle ATM rt request (in support of generic code)
* inputs: "req" = request code
* "rt" = route entry
* "sa" = sockaddr
*/
void
atm_rtrequest(req, rt, sa)
int req;
register struct rtentry *rt;
struct sockaddr *sa;
{
register struct sockaddr *gate = rt->rt_gateway;
static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
if (rt->rt_flags & RTF_GATEWAY) /* link level requests only */
return;
switch (req) {
case RTM_RESOLVE: /* resolve: only happens when cloning */
printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
break;
case RTM_ADD:
/*
* route added by a command (e.g. ifconfig, route, arp...).
*
* first check to see if this is not a host route, in which
* case we are being called via "ifconfig" to set the address.
*/
if ((rt->rt_flags & RTF_HOST) == 0) {
rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
gate = rt->rt_gateway;
SDL(gate)->sdl_type = rt->rt_ifp->if_type;
SDL(gate)->sdl_index = rt->rt_ifp->if_index;
break;
}
if ((rt->rt_flags & RTF_CLONING) != 0) {
printf("atm_rtrequest: cloning route detected?\n");
break;
}
if (gate->sa_family != AF_LINK ||
gate->sa_len < sizeof(null_sdl)) {
log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
break;
}
#ifdef DIAGNOSTIC
if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
#endif
/*
* let the lower level know this circuit is active
*/
if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA,
LLADDR(SDL(gate))) != 0) {
printf("atm: couldn't add VC\n");
/* XXX: do we need to do anything else to recover? */
break;
}
SDL(gate)->sdl_type = rt->rt_ifp->if_type;
SDL(gate)->sdl_index = rt->rt_ifp->if_index;
break;
case RTM_DELETE:
/*
* tell the lower layer to disable this circuit
*/
(void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS,
LLADDR(SDL(gate)));
break;
}
}
/*
* atmresolve:
* inputs:
* [1] "rt" = the link level route to use (or null if need to look one up)
* [2] "m" = mbuf containing the data to be sent
* [3] "dst" = sockaddr_in (IP) address of dest.
* output:
* [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
* return:
* 0 == resolve FAILED; note that "m" gets m_freem'd in this case
* 1 == resolve OK; desten contains result
*
* XXX: will need more work if we wish to support ATMARP in the kernel,
* but this is enough for PVCs entered via the "route" command.
*/
int
atmresolve(rt, m, dst, desten)
register struct rtentry *rt;
struct mbuf *m;
register struct sockaddr *dst;
register struct atm_pseudohdr *desten; /* OUT */
{
struct sockaddr_dl *sdl;
if (m->m_flags & (M_BCAST|M_MCAST)) {
log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
goto bad;
}
if (rt == NULL) {
rt = rtalloc1(dst, 0);
if (rt == NULL) goto bad; /* failed */
rt->rt_refcnt--; /* don't keep LL references */
if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
(rt->rt_flags & RTF_LLINFO) == 0 ||
/* XXX: are we using LLINFO? */
rt->rt_gateway->sa_family != AF_LINK) {
goto bad;
}
}
/*
* note that rt_gateway is a sockaddr_dl which contains the
* atm_pseudohdr data structure for this route. we currently
* don't need any rt_llinfo info (but will if we want to support
* ATM ARP [c.f. if_ether.c]).
*/
sdl = SDL(rt->rt_gateway);
/*
* Check the address family and length is valid, the address
* is resolved; otherwise, try to resolve.
*/
if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
return(1); /* ok, go for it! */
}
/*
* we got an entry, but it doesn't have valid link address
* info in it (it is prob. the interface route, which has
* sdl_alen == 0). dump packet. (fall through to "bad").
*/
bad:
m_freem(m);
return(0);
}
#endif /* INET */
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