5493f188c7
parentheses in return statements.
Cosmetic: don't open-code TAILQ_FOREACH().
Cosmetic: change types of variables to avoid oodles of casts: in
in6_src.c, avoid casts by changing several route_in6 pointers
to struct route pointers. Remove unnecessary casts to caddr_t
elsewhere.
Pave the way for eliminating address family-specific route caches:
soon, struct route will not embed a sockaddr, but it will hold
a reference to an external sockaddr, instead. We will set the
destination sockaddr using rtcache_setdst(). (I created a stub
for it, but it isn't used anywhere, yet.) rtcache_free() will
free the sockaddr. I have extracted from rtcache_free() a helper
subroutine, rtcache_clear(). rtcache_clear() will "forget" a
cached route, but it will not forget the destination by releasing
the sockaddr. I use rtcache_clear() instead of rtcache_free()
in rtcache_update(), because rtcache_update() is not supposed
to forget the destination.
Constify:
1 Introduce const accessor for route->ro_dst, rtcache_getdst().
2 Constify the 'dst' argument to ifnet->if_output(). This
led me to constify a lot of code called by output routines.
3 Constify the sockaddr argument to protosw->pr_ctlinput. This
led me to constify a lot of code called by ctlinput routines.
4 Introduce const macros for converting from a generic sockaddr
to family-specific sockaddrs, e.g., sockaddr_in: satocsin6,
satocsin, et cetera.
144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
/* $NetBSD: in_route.c,v 1.4 2007/02/17 22:34:11 dyoung Exp $ */
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/*
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* Copyright (c) 2006 David Young. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions 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
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of David Young may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL David
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* Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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
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* OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: in_route.c,v 1.4 2007/02/17 22:34:11 dyoung Exp $");
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#include "opt_inet.h"
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#include "opt_in_route.h"
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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/queue.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/radix.h>
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#ifdef RADIX_MPATH
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#include <net/radix_mpath.h>
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#endif
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/in_ifattach.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_proto.h>
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#include <netinet/in_route.h>
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LIST_HEAD(in_rtlist, route) in_rtcache_head =
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LIST_HEAD_INITIALIZER(in_rtcache_head);
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#ifdef IN_RTFLUSH_DEBUG
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#define in_rtcache_debug() _in_rtcache_debug
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#else /* IN_RTFLUSH_DEBUG */
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#define in_rtcache_debug() 0
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#endif /* IN_RTFLUSH_DEBUG */
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#ifdef IN_RTFLUSH_DEBUG
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static int _in_rtcache_debug = 0;
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SYSCTL_SETUP(sysctl_net_inet_ip_rtcache_setup,
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"sysctl net.inet.ip.rtcache_debug setup")
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{
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/* XXX do not duplicate */
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "net", NULL,
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NULL, 0, NULL, 0,
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CTL_NET, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "inet",
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SYSCTL_DESCR("PF_INET related settings"),
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NULL, 0, NULL, 0,
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CTL_NET, PF_INET, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "ip",
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SYSCTL_DESCR("IPv4 related settings"),
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NULL, 0, NULL, 0,
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CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT,
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"rtcache_debug",
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SYSCTL_DESCR("Debug IP route cache"),
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NULL, 0, &_in_rtcache_debug, 0,
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CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
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}
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#endif /* IN_RTFLUSH_DEBUG */
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void
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in_rtcache(struct route *ro)
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{
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KASSERT(ro->ro_rt != NULL);
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KASSERT(rtcache_getdst(ro)->sa_family == AF_INET);
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LIST_INSERT_HEAD(&in_rtcache_head, ro, ro_rtcache_next);
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}
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void
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in_rtflush(struct route *ro)
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{
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KASSERT(rtcache_getdst(ro)->sa_family == AF_INET);
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KASSERT(ro->ro_rt == NULL);
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LIST_REMOVE(ro, ro_rtcache_next);
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if (in_rtcache_debug()) {
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printf("%s: freeing %s\n", __func__,
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inet_ntoa((satocsin(rtcache_getdst(ro)))->sin_addr));
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}
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}
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void
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in_rtflushall(void)
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{
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int s;
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struct route *ro;
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s = splnet();
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if (in_rtcache_debug())
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printf("%s: enter\n", __func__);
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while ((ro = LIST_FIRST(&in_rtcache_head)) != NULL) {
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KASSERT(ro->ro_rt != NULL);
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rtcache_free(ro);
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}
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splx(s);
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}
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