277 lines
7.3 KiB
C
277 lines
7.3 KiB
C
/* $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $ */
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/*
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*
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* Copyright (c) 1996 Charles D. Cranor and Washington University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles D. Cranor and
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* Washington University.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* IP <=> ATM address resolution.
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*/
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#include "opt_inet.h"
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#include "opt_natm.h"
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#ifdef INET
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <net/if_atm.h>
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#include <netinet/in.h>
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#include <netinet/if_atm.h>
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#ifdef NATM
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#include <netnatm/natm.h>
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#endif
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#define SDL(s) ((struct sockaddr_dl *)s)
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/*
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* atm_rtrequest: handle ATM rt request (in support of generic code)
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* inputs: "req" = request code
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* "rt" = route entry
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* "sa" = sockaddr
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*/
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void
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atm_rtrequest(req, rt, sa)
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int req;
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register struct rtentry *rt;
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struct sockaddr *sa;
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{
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register struct sockaddr *gate = rt->rt_gateway;
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struct atm_pseudoioctl api;
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#ifdef NATM
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struct sockaddr_in *sin;
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struct natmpcb *npcb = NULL;
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struct atm_pseudohdr *aph;
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#endif
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static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
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if (rt->rt_flags & RTF_GATEWAY) /* link level requests only */
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return;
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switch (req) {
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case RTM_RESOLVE: /* resolve: only happens when cloning */
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printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
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break;
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case RTM_ADD:
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/*
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* route added by a command (e.g. ifconfig, route, arp...).
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*
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* first check to see if this is not a host route, in which
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* case we are being called via "ifconfig" to set the address.
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*/
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if ((rt->rt_flags & RTF_HOST) == 0) {
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rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
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gate = rt->rt_gateway;
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SDL(gate)->sdl_type = rt->rt_ifp->if_type;
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SDL(gate)->sdl_index = rt->rt_ifp->if_index;
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break;
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}
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if ((rt->rt_flags & RTF_CLONING) != 0) {
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printf("atm_rtrequest: cloning route detected?\n");
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break;
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}
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if (gate->sa_family != AF_LINK ||
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gate->sa_len < sizeof(null_sdl)) {
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log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
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break;
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}
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#ifdef DIAGNOSTIC
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if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
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#endif
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#ifdef NATM
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/*
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* let native ATM know we are using this VCI/VPI
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* (i.e. reserve it)
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*/
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sin = (struct sockaddr_in *) rt_key(rt);
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if (sin->sin_family != AF_INET)
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goto failed;
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aph = (struct atm_pseudohdr *) LLADDR(SDL(gate));
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npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
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ATM_PH_VPI(aph));
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if (npcb == NULL)
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goto failed;
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npcb->npcb_flags |= NPCB_IP;
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npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
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/* XXX: move npcb to llinfo when ATM ARP is ready */
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rt->rt_llinfo = (caddr_t) npcb;
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rt->rt_flags |= RTF_LLINFO;
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#endif
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/*
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* let the lower level know this circuit is active
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*/
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bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
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api.rxhand = NULL;
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if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA,
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(caddr_t)&api) != 0) {
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printf("atm: couldn't add VC\n");
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goto failed;
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}
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SDL(gate)->sdl_type = rt->rt_ifp->if_type;
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SDL(gate)->sdl_index = rt->rt_ifp->if_index;
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break;
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failed:
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#ifdef NATM
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if (npcb) {
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npcb_free(npcb, NPCB_DESTROY);
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rt->rt_llinfo = NULL;
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rt->rt_flags &= ~RTF_LLINFO;
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}
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#endif
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rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
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rt_mask(rt), 0, (struct rtentry **) 0);
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break;
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case RTM_DELETE:
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#ifdef NATM
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/*
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* tell native ATM we are done with this VC
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*/
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if (rt->rt_flags & RTF_LLINFO) {
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npcb_free((struct natmpcb *)rt->rt_llinfo,
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NPCB_DESTROY);
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rt->rt_llinfo = NULL;
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rt->rt_flags &= ~RTF_LLINFO;
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}
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#endif
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/*
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* tell the lower layer to disable this circuit
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*/
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bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
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api.rxhand = NULL;
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(void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS,
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(caddr_t)&api);
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break;
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}
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}
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/*
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* atmresolve:
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* inputs:
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* [1] "rt" = the link level route to use (or null if need to look one up)
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* [2] "m" = mbuf containing the data to be sent
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* [3] "dst" = sockaddr_in (IP) address of dest.
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* output:
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* [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
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* return:
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* 0 == resolve FAILED; note that "m" gets m_freem'd in this case
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* 1 == resolve OK; desten contains result
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*
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* XXX: will need more work if we wish to support ATMARP in the kernel,
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* but this is enough for PVCs entered via the "route" command.
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*/
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int
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atmresolve(rt, m, dst, desten)
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register struct rtentry *rt;
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struct mbuf *m;
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register struct sockaddr *dst;
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register struct atm_pseudohdr *desten; /* OUT */
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{
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struct sockaddr_dl *sdl;
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if (m->m_flags & (M_BCAST|M_MCAST)) {
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log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
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goto bad;
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}
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if (rt == NULL) {
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rt = RTALLOC1(dst, 0);
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if (rt == NULL) goto bad; /* failed */
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rt->rt_refcnt--; /* don't keep LL references */
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if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
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(rt->rt_flags & RTF_LLINFO) == 0 ||
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/* XXX: are we using LLINFO? */
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rt->rt_gateway->sa_family != AF_LINK) {
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goto bad;
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}
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}
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/*
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* note that rt_gateway is a sockaddr_dl which contains the
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* atm_pseudohdr data structure for this route. we currently
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* don't need any rt_llinfo info (but will if we want to support
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* ATM ARP [c.f. if_ether.c]).
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*/
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sdl = SDL(rt->rt_gateway);
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/*
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* Check the address family and length is valid, the address
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* is resolved; otherwise, try to resolve.
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*/
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if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
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bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
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return(1); /* ok, go for it! */
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}
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/*
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* we got an entry, but it doesn't have valid link address
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* info in it (it is prob. the interface route, which has
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* sdl_alen == 0). dump packet. (fall through to "bad").
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*/
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bad:
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m_freem(m);
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return(0);
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}
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#endif /* INET */
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