c308b1c661
routing caused by stale route caches (struct route). Route caches are sprinkled throughout PCBs, the IP fast-forwarding table, and IP tunnel interfaces (gre, gif, stf). Stale IPv6 and ISO route caches will be treated by separate patches. Thank you to Christoph Badura for suggesting the general approach to invalidating route caches that I take here. Here are the details: Add hooks to struct domain for tracking and for invalidating each domain's route caches: dom_rtcache, dom_rtflush, and dom_rtflushall. Introduce helper subroutines, rtflush(ro) for invalidating a route cache, rtflushall(family) for invalidating all route caches in a routing domain, and rtcache(ro) for notifying the domain of a new cached route. Chain together all IPv4 route caches where ro_rt != NULL. Provide in_rtcache() for adding a route to the chain. Provide in_rtflush() and in_rtflushall() for invalidating IPv4 route caches. In in_rtflush(), set ro_rt to NULL, and remove the route from the chain. In in_rtflushall(), walk the chain and remove every route cache. In rtrequest1(), call rtflushall() to invalidate route caches when a route is added. In gif(4), discard the workaround for stale caches that involves expiring them every so often. Replace the pattern 'RTFREE(ro->ro_rt); ro->ro_rt = NULL;' with a call to rtflush(ro). Update ipflow_fastforward() and all other users of route caches so that they expect a cached route, ro->ro_rt, to turn to NULL. Take care when moving a 'struct route' to rtflush() the source and to rtcache() the destination. In domain initializers, use .dom_xxx tags. KNF here and there.
196 lines
6.4 KiB
C
196 lines
6.4 KiB
C
/* $NetBSD: iso_proto.c,v 1.22 2006/12/09 05:33:09 dyoung Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)iso_proto.c 8.2 (Berkeley) 2/9/95
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*/
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/***********************************************************
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Copyright IBM Corporation 1987
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of IBM not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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/*
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* ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
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*/
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/*
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* iso_proto.c : protocol switch tables in the ISO domain
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*
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* ISO protocol family includes TP, CLTP, CLNP, 8208
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* TP and CLNP are implemented here.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: iso_proto.c,v 1.22 2006/12/09 05:33:09 dyoung Exp $");
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/domain.h>
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#include <sys/mbuf.h>
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#include <net/radix.h>
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#include <netiso/iso.h>
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#include <netiso/clnp.h>
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#include <netiso/tp_param.h>
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#include <netiso/tp_var.h>
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#include <netiso/esis.h>
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#include <netiso/idrp_var.h>
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#include <netiso/iso_pcb.h>
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#include <netiso/cltp_var.h>
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const int isoctlerrmap[PRC_NCMDS] = {
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0, 0, 0, 0,
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0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
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EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
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EMSGSIZE, EHOSTUNREACH, 0, 0,
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0, 0, 0, 0,
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ENOPROTOOPT
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};
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DOMAIN_DEFINE(isodomain); /* forward declare and add to link set */
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const struct protosw isosw[] = {
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/*
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* We need a datagram entry through which net mgmt programs can get
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* to the iso_control procedure (iso ioctls). Thus, a minimal
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* SOCK_DGRAM interface is provided here.
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* THIS ONE MUST BE FIRST: Kludge city : socket() says if(!proto) call
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* pffindtype, which gets the first entry that matches the type.
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* sigh.
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*/
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{SOCK_DGRAM, &isodomain, ISOPROTO_CLTP, PR_ATOMIC | PR_ADDR,
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0, cltp_output, 0, 0,
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cltp_usrreq,
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cltp_init, 0, 0, 0
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},
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/*
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* A datagram interface for clnp cannot co-exist with TP/CLNP
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* because CLNP has no way to discriminate incoming TP packets from
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* packets coming in for any other higher layer protocol.
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* Old way: set it up so that pffindproto(... dgm, clnp) fails.
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* New way: let pffindproto work (for x.25, thank you) but create
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* a clnp_usrreq() that returns error on PRU_ATTACH.
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*/
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{SOCK_DGRAM, &isodomain, ISOPROTO_CLNP, 0,
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0, clnp_output, 0, 0,
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clnp_usrreq,
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clnp_init, 0, clnp_slowtimo, clnp_drain,
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},
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/* raw clnp */
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{SOCK_RAW, &isodomain, ISOPROTO_RAW, PR_ATOMIC | PR_ADDR,
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rclnp_input, rclnp_output, 0, rclnp_ctloutput,
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clnp_usrreq,
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0, 0, 0, 0
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},
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/* ES-IS protocol */
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{SOCK_DGRAM, &isodomain, ISOPROTO_ESIS, PR_ATOMIC | PR_ADDR,
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esis_input, 0, esis_ctlinput, 0,
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esis_usrreq,
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esis_init, 0, 0, 0
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},
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/* ISOPROTO_INTRAISIS */
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{SOCK_DGRAM, &isodomain, ISOPROTO_INTRAISIS, PR_ATOMIC | PR_ADDR,
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isis_input, 0, 0, 0,
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esis_usrreq,
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0, 0, 0, 0
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},
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/* ISOPROTO_IDRP */
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{SOCK_DGRAM, &isodomain, ISOPROTO_IDRP, PR_ATOMIC | PR_ADDR,
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idrp_input, 0, 0, 0,
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idrp_usrreq,
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idrp_init, 0, 0, 0
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},
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/* ISOPROTO_TP */
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{SOCK_SEQPACKET, &isodomain, ISOPROTO_TP, PR_CONNREQUIRED | PR_WANTRCVD | PR_LISTEN | PR_ABRTACPTDIS,
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tpclnp_input, 0, tpclnp_ctlinput, tp_ctloutput,
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tp_usrreq,
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tp_init, tp_fasttimo, tp_slowtimo, tp_drain,
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},
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#ifdef TPCONS
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/* ISOPROTO_TP */
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{SOCK_SEQPACKET, &isodomain, ISOPROTO_TP0, PR_CONNREQUIRED | PR_WANTRCVD | PR_LISTEN | PR_ABRTACPTDIS,
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tpcons_input, 0, 0, tp_ctloutput,
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tp_usrreq,
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cons_init, 0, 0, 0,
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},
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#endif
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};
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extern struct ifqueue clnlintrq;
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struct domain isodomain = {
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.dom_family = PF_ISO,
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.dom_name = "iso-domain",
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.dom_init = NULL,
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.dom_externalize = NULL,
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.dom_dispose = NULL,
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.dom_protosw = isosw,
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.dom_protoswNPROTOSW = &isosw[sizeof(isosw) / sizeof(isosw[0])],
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.dom_rtattach = rn_inithead, /* rtattach */
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.dom_rtoffset = 48, /* rtoffset */
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.dom_maxrtkey = sizeof(struct sockaddr_iso), /* maxkeylen */
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.dom_ifattach = NULL,
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.dom_ifdetach = NULL,
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.dom_ifqueues = { &clnlintrq, NULL }, /* ifqueues */
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.dom_link = { NULL },
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.dom_mowner = MOWNER_INIT("",""),
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.dom_rtcache = NULL,
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.dom_rtflush = NULL,
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.dom_rtflushall = NULL
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};
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