FreeBSD-5.3/sys/netinet/if_atm.c
/* $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/netinet/if_atm.c,v 1.18 2004/08/16 18:32:07 rwatson Exp $");
/*
* IP <=> ATM address resolution.
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_natm.h"
#if defined(INET) || defined(INET6)
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/syslog.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/if_atm.h>
#ifdef NATM
#include <netnatm/natm.h>
#endif
#define SDL(s) ((struct sockaddr_dl *)s)
#define GET3BYTE(V, A, L) do { \
(V) = ((A)[0] << 16) | ((A)[1] << 8) | (A)[2]; \
(A) += 3; \
(L) -= 3; \
} while (0)
#define GET2BYTE(V, A, L) do { \
(V) = ((A)[0] << 8) | (A)[1]; \
(A) += 2; \
(L) -= 2; \
} while (0)
#define GET1BYTE(V, A, L) do { \
(V) = *(A)++; \
(L)--; \
} while (0)
/*
* atm_rtrequest: handle ATM rt request (in support of generic code)
* inputs: "req" = request code
* "rt" = route entry
* "info" = rt_addrinfo
*/
void
atm_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
{
struct sockaddr *gate = rt->rt_gateway;
struct atmio_openvcc op;
struct atmio_closevcc cl;
u_char *addr;
u_int alen;
#ifdef NATM
struct sockaddr_in *sin;
struct natmpcb *npcb = NULL;
#endif
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;
}
KASSERT(rt->rt_ifp->if_ioctl != NULL,
("atm_rtrequest: null ioctl"));
/*
* Parse and verify the link level address as
* an open request
*/
bzero(&op, sizeof(op));
addr = LLADDR(SDL(gate));
alen = SDL(gate)->sdl_alen;
if (alen < 4) {
printf("%s: bad link-level address\n", __func__);
goto failed;
}
if (alen == 4) {
/* old type address */
GET1BYTE(op.param.flags, addr, alen);
GET1BYTE(op.param.vpi, addr, alen);
GET2BYTE(op.param.vci, addr, alen);
op.param.traffic = ATMIO_TRAFFIC_UBR;
op.param.aal = (op.param.flags & ATM_PH_AAL5) ?
ATMIO_AAL_5 : ATMIO_AAL_0;
} else {
/* new address */
op.param.aal = ATMIO_AAL_5;
GET1BYTE(op.param.flags, addr, alen);
op.param.flags &= ATM_PH_LLCSNAP;
GET1BYTE(op.param.vpi, addr, alen);
GET2BYTE(op.param.vci, addr, alen);
GET1BYTE(op.param.traffic, addr, alen);
switch (op.param.traffic) {
case ATMIO_TRAFFIC_UBR:
if (alen >= 3)
GET3BYTE(op.param.tparam.pcr,
addr, alen);
break;
case ATMIO_TRAFFIC_CBR:
if (alen < 3)
goto bad_param;
GET3BYTE(op.param.tparam.pcr, addr, alen);
break;
case ATMIO_TRAFFIC_VBR:
if (alen < 3 * 3)
goto bad_param;
GET3BYTE(op.param.tparam.pcr, addr, alen);
GET3BYTE(op.param.tparam.scr, addr, alen);
GET3BYTE(op.param.tparam.mbs, addr, alen);
break;
case ATMIO_TRAFFIC_ABR:
if (alen < 4 * 3 + 2 + 1 * 2 + 3)
goto bad_param;
GET3BYTE(op.param.tparam.pcr, addr, alen);
GET3BYTE(op.param.tparam.mcr, addr, alen);
GET3BYTE(op.param.tparam.icr, addr, alen);
GET3BYTE(op.param.tparam.tbe, addr, alen);
GET1BYTE(op.param.tparam.nrm, addr, alen);
GET1BYTE(op.param.tparam.trm, addr, alen);
GET2BYTE(op.param.tparam.adtf, addr, alen);
GET1BYTE(op.param.tparam.rif, addr, alen);
GET1BYTE(op.param.tparam.rdf, addr, alen);
GET1BYTE(op.param.tparam.cdf, addr, alen);
break;
default:
bad_param:
printf("%s: bad traffic params\n", __func__);
goto failed;
}
}
op.param.rmtu = op.param.tmtu = rt->rt_ifp->if_mtu;
#ifdef NATM
/*
* let native ATM know we are using this VCI/VPI
* (i.e. reserve it)
*/
sin = (struct sockaddr_in *) rt_key(rt);
if (sin->sin_family != AF_INET)
goto failed;
npcb = npcb_add(NULL, rt->rt_ifp, op.param.vci, op.param.vpi);
if (npcb == NULL)
goto failed;
npcb->npcb_flags |= NPCB_IP;
npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
/* XXX: move npcb to llinfo when ATM ARP is ready */
rt->rt_llinfo = (caddr_t) npcb;
rt->rt_flags |= RTF_LLINFO;
#endif
/*
* let the lower level know this circuit is active
*/
op.rxhand = NULL;
op.param.flags |= ATMIO_FLAG_ASYNC;
if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMOPENVCC,
(caddr_t)&op) != 0) {
printf("atm: couldn't add VC\n");
goto failed;
}
SDL(gate)->sdl_type = rt->rt_ifp->if_type;
SDL(gate)->sdl_index = rt->rt_ifp->if_index;
break;
failed:
#ifdef NATM
if (npcb) {
npcb_free(npcb, NPCB_DESTROY);
rt->rt_llinfo = NULL;
rt->rt_flags &= ~RTF_LLINFO;
}
#endif
/* mark as invalid. We cannot RTM_DELETE the route from
* here, because the recursive call to rtrequest1 does
* not really work. */
rt->rt_flags |= RTF_REJECT;
break;
case RTM_DELETE:
#ifdef NATM
/*
* tell native ATM we are done with this VC
*/
if (rt->rt_flags & RTF_LLINFO) {
npcb_free((struct natmpcb *)rt->rt_llinfo,
NPCB_DESTROY);
rt->rt_llinfo = NULL;
rt->rt_flags &= ~RTF_LLINFO;
}
#endif
/*
* tell the lower layer to disable this circuit
*/
bzero(&op, sizeof(op));
addr = LLADDR(SDL(gate));
addr++;
cl.vpi = *addr++;
cl.vci = *addr++ << 8;
cl.vci |= *addr++;
(void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMCLOSEVCC,
(caddr_t)&cl);
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(struct rtentry *rt, struct mbuf *m, struct sockaddr *dst,
struct atm_pseudohdr *desten)
{
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_REMREF(rt); /* 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) {
RT_UNLOCK(rt);
goto bad;
}
RT_UNLOCK(rt);
}
/*
* 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, sizeof(*desten));
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 */