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7138d65c3f
macros that expand to include assertions when the system is built with INVARIANTS Supported by: FreeBSD Foundation
361 lines
9.8 KiB
C
361 lines
9.8 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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_inet6.h"
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#include "opt_natm.h"
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#if defined(INET) || defined(INET6)
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/queue.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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#define GET3BYTE(V, A, L) do { \
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(V) = ((A)[0] << 16) | ((A)[1] << 8) | (A)[2]; \
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(A) += 3; \
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(L) -= 3; \
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} while (0)
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#define GET2BYTE(V, A, L) do { \
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(V) = ((A)[0] << 8) | (A)[1]; \
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(A) += 2; \
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(L) -= 2; \
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} while (0)
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#define GET1BYTE(V, A, L) do { \
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(V) = *(A)++; \
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(L)--; \
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} while (0)
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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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* "info" = rt_addrinfo
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*/
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void
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atm_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
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{
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struct sockaddr *gate = rt->rt_gateway;
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struct atmio_openvcc op;
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struct atmio_closevcc cl;
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u_char *addr;
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u_int alen;
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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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#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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KASSERT(rt->rt_ifp->if_ioctl != NULL,
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("atm_rtrequest: null ioctl"));
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/*
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* Parse and verify the link level address as
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* an open request
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*/
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bzero(&op, sizeof(op));
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addr = LLADDR(SDL(gate));
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alen = SDL(gate)->sdl_alen;
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if (alen < 4) {
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printf("%s: bad link-level address\n", __func__);
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goto failed;
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}
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if (alen == 4) {
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/* old type address */
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GET1BYTE(op.param.flags, addr, alen);
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GET1BYTE(op.param.vpi, addr, alen);
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GET2BYTE(op.param.vci, addr, alen);
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op.param.traffic = ATMIO_TRAFFIC_UBR;
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op.param.aal = (op.param.flags & ATM_PH_AAL5) ?
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ATMIO_AAL_5 : ATMIO_AAL_0;
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} else {
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/* new address */
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op.param.aal = ATMIO_AAL_5;
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GET1BYTE(op.param.flags, addr, alen);
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op.param.flags &= ATM_PH_LLCSNAP;
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GET1BYTE(op.param.vpi, addr, alen);
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GET2BYTE(op.param.vci, addr, alen);
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GET1BYTE(op.param.traffic, addr, alen);
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switch (op.param.traffic) {
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case ATMIO_TRAFFIC_UBR:
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if (alen >= 3)
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GET3BYTE(op.param.tparam.pcr,
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addr, alen);
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break;
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case ATMIO_TRAFFIC_CBR:
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if (alen < 3)
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goto bad_param;
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GET3BYTE(op.param.tparam.pcr, addr, alen);
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break;
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case ATMIO_TRAFFIC_VBR:
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if (alen < 3 * 3)
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goto bad_param;
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GET3BYTE(op.param.tparam.pcr, addr, alen);
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GET3BYTE(op.param.tparam.scr, addr, alen);
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GET3BYTE(op.param.tparam.mbs, addr, alen);
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break;
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case ATMIO_TRAFFIC_ABR:
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if (alen < 4 * 3 + 2 + 1 * 2 + 3)
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goto bad_param;
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GET3BYTE(op.param.tparam.pcr, addr, alen);
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GET3BYTE(op.param.tparam.mcr, addr, alen);
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GET3BYTE(op.param.tparam.icr, addr, alen);
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GET3BYTE(op.param.tparam.tbe, addr, alen);
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GET1BYTE(op.param.tparam.nrm, addr, alen);
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GET1BYTE(op.param.tparam.trm, addr, alen);
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GET2BYTE(op.param.tparam.adtf, addr, alen);
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GET1BYTE(op.param.tparam.rif, addr, alen);
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GET1BYTE(op.param.tparam.rdf, addr, alen);
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GET1BYTE(op.param.tparam.cdf, addr, alen);
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break;
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default:
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bad_param:
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printf("%s: bad traffic params\n", __func__);
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goto failed;
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}
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}
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op.param.rmtu = op.param.tmtu = rt->rt_ifp->if_mtu;
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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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npcb = npcb_add(NULL, rt->rt_ifp, op.param.vci, op.param.vpi);
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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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op.rxhand = NULL;
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op.param.flags |= ATMIO_FLAG_ASYNC;
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if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMOPENVCC,
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(caddr_t)&op) != 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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/* mark as invalid. We cannot RTM_DELETE the route from
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* here, because the recursive call to rtrequest1 does
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* not really work. */
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rt->rt_flags |= RTF_REJECT;
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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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bzero(&op, sizeof(op));
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addr = LLADDR(SDL(gate));
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addr++;
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cl.vpi = *addr++;
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cl.vci = *addr++ << 8;
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cl.vci |= *addr++;
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(void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMCLOSEVCC,
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(caddr_t)&cl);
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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(struct rtentry *rt, struct mbuf *m, struct sockaddr *dst,
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struct atm_pseudohdr *desten)
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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)
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goto bad; /* failed */
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RT_REMREF(rt); /* 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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RT_UNLOCK(rt);
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goto bad;
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}
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RT_UNLOCK(rt);
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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, sizeof(*desten));
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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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