6e6b3f7cbc
1. separating L2 tables (ARP, NDP) from the L3 routing tables
2. removing as much locking dependencies among these layers as
possible to allow for some parallelism in the search operations
3. simplify the logic in the routing code,
The most notable end result is the obsolescent of the route
cloning (RTF_CLONING) concept, which translated into code reduction
in both IPv4 ARP and IPv6 NDP related modules, and size reduction in
struct rtentry{}. The change in design obsoletes the semantics of
RTF_CLONING, RTF_WASCLONE and RTF_LLINFO routing flags. The userland
applications such as "arp" and "ndp" have been modified to reflect
those changes. The output from "netstat -r" shows only the routing
entries.
Quite a few developers have contributed to this project in the
past: Glebius Smirnoff, Luigi Rizzo, Alessandro Cerri, and
Andre Oppermann. And most recently:
- Kip Macy revised the locking code completely, thus completing
the last piece of the puzzle, Kip has also been conducting
active functional testing
- Sam Leffler has helped me improving/refactoring the code, and
provided valuable reviews
- Julian Elischer setup the perforce tree for me and has helped
me maintaining that branch before the svn conversion
365 lines
9.8 KiB
C
365 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 (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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#ifdef NATM
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NATM_LOCK();
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#endif
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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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#ifdef NATM
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NATM_UNLOCK();
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#endif
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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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NATM_UNLOCK();
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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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NATM_LOCK();
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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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NATM_UNLOCK();
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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,
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"atmresolve: BCAST/MCAST packet detected/dumped\n");
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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); /* link level on table 0 XXX MRT */
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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_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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