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/* $NetBSD: route.c,v 1.127 2013/06/08 02:42:56 christos Exp $ */
/*-
* Copyright (c) 1998, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Kevin M. Lahey of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1980, 1986, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)route.c 8.3 (Berkeley) 1/9/95
*/
#include "opt_route.h"
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: route.c,v 1.127 2013/06/08 02:42:56 christos Exp $");
#include <sys/param.h>
#include <sys/kmem.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/kernel.h>
#include <sys/ioctl.h>
#include <sys/pool.h>
#include <sys/kauth.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/raw_cb.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#ifdef RTFLUSH_DEBUG
#define rtcache_debug() __predict_false(_rtcache_debug)
#else /* RTFLUSH_DEBUG */
#define rtcache_debug() 0
#endif /* RTFLUSH_DEBUG */
struct rtstat rtstat;
int rttrash; /* routes not in table but not freed */
struct pool rtentry_pool;
struct pool rttimer_pool;
struct callout rt_timer_ch; /* callout for rt_timer_timer() */
#ifdef RTFLUSH_DEBUG
static int _rtcache_debug = 0;
#endif /* RTFLUSH_DEBUG */
static kauth_listener_t route_listener;
static int rtdeletemsg(struct rtentry *);
static int rtflushclone1(struct rtentry *, void *);
static void rtflushclone(sa_family_t family, struct rtentry *);
#ifdef RTFLUSH_DEBUG
static void sysctl_net_rtcache_setup(struct sysctllog **);
static void
sysctl_net_rtcache_setup(struct sysctllog **clog)
{
const struct sysctlnode *rnode;
/* XXX do not duplicate */
if (sysctl_createv(clog, 0, NULL, &rnode, CTLFLAG_PERMANENT,
CTLTYPE_NODE, "net", NULL, NULL, 0, NULL, 0, CTL_NET, CTL_EOL) != 0)
return;
if (sysctl_createv(clog, 0, &rnode, &rnode, CTLFLAG_PERMANENT,
CTLTYPE_NODE,
"rtcache", SYSCTL_DESCR("Route cache related settings"),
NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL) != 0)
return;
if (sysctl_createv(clog, 0, &rnode, &rnode,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT,
"debug", SYSCTL_DESCR("Debug route caches"),
NULL, 0, &_rtcache_debug, 0, CTL_CREATE, CTL_EOL) != 0)
return;
}
#endif /* RTFLUSH_DEBUG */
struct ifaddr *
rt_get_ifa(struct rtentry *rt)
{
struct ifaddr *ifa;
if ((ifa = rt->rt_ifa) == NULL)
return ifa;
else if (ifa->ifa_getifa == NULL)
return ifa;
#if 0
else if (ifa->ifa_seqno != NULL && *ifa->ifa_seqno == rt->rt_ifa_seqno)
return ifa;
#endif
else {
ifa = (*ifa->ifa_getifa)(ifa, rt_getkey(rt));
rt_replace_ifa(rt, ifa);
return ifa;
}
}
static void
rt_set_ifa1(struct rtentry *rt, struct ifaddr *ifa)
{
rt->rt_ifa = ifa;
if (ifa->ifa_seqno != NULL)
rt->rt_ifa_seqno = *ifa->ifa_seqno;
}
/*
* Is this route the connected route for the ifa?
*/
static int
rt_ifa_connected(const struct rtentry *rt, const struct ifaddr *ifa)
{
const struct sockaddr *key, *dst, *odst;
struct sockaddr_storage maskeddst;
key = rt_getkey(rt);
dst = rt->rt_flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr;
if (dst == NULL ||
dst->sa_family != key->sa_family ||
dst->sa_len != key->sa_len)
return 0;
if ((rt->rt_flags & RTF_HOST) == 0 && ifa->ifa_netmask) {
odst = dst;
dst = (struct sockaddr *)&maskeddst;
rt_maskedcopy(odst, (struct sockaddr *)&maskeddst,
ifa->ifa_netmask);
}
return (memcmp(dst, key, dst->sa_len) == 0);
}
void
rt_replace_ifa(struct rtentry *rt, struct ifaddr *ifa)
{
if (rt->rt_ifa &&
rt->rt_ifa != ifa &&
rt->rt_ifa->ifa_flags & IFA_ROUTE &&
rt_ifa_connected(rt, rt->rt_ifa))
{
RT_DPRINTF("rt->_rt_key = %p, ifa = %p, "
"replace deleted IFA_ROUTE\n",
(void *)rt->_rt_key, (void *)rt->rt_ifa);
rt->rt_ifa->ifa_flags &= ~IFA_ROUTE;
if (rt_ifa_connected(rt, ifa)) {
RT_DPRINTF("rt->_rt_key = %p, ifa = %p, "
"replace added IFA_ROUTE\n",
(void *)rt->_rt_key, (void *)ifa);
ifa->ifa_flags |= IFA_ROUTE;
}
}
IFAREF(ifa);
IFAFREE(rt->rt_ifa);
rt_set_ifa1(rt, ifa);
}
static void
rt_set_ifa(struct rtentry *rt, struct ifaddr *ifa)
{
IFAREF(ifa);
rt_set_ifa1(rt, ifa);
}
static int
route_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
void *arg0, void *arg1, void *arg2, void *arg3)
{
struct rt_msghdr *rtm;
int result;
result = KAUTH_RESULT_DEFER;
rtm = arg1;
if (action != KAUTH_NETWORK_ROUTE)
return result;
if (rtm->rtm_type == RTM_GET)
result = KAUTH_RESULT_ALLOW;
return result;
}
void
rt_init(void)
{
#ifdef RTFLUSH_DEBUG
sysctl_net_rtcache_setup(NULL);
#endif
pool_init(&rtentry_pool, sizeof(struct rtentry), 0, 0, 0, "rtentpl",
NULL, IPL_SOFTNET);
pool_init(&rttimer_pool, sizeof(struct rttimer), 0, 0, 0, "rttmrpl",
NULL, IPL_SOFTNET);
rn_init(); /* initialize all zeroes, all ones, mask table */
rtbl_init();
route_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
route_listener_cb, NULL);
}
void
rtflushall(int family)
{
struct domain *dom;
if (rtcache_debug())
printf("%s: enter\n", __func__);
if ((dom = pffinddomain(family)) == NULL)
return;
rtcache_invalidate(&dom->dom_rtcache);
}
void
rtcache(struct route *ro)
{
struct domain *dom;
rtcache_invariants(ro);
KASSERT(ro->_ro_rt != NULL);
KASSERT(ro->ro_invalid == false);
KASSERT(rtcache_getdst(ro) != NULL);
if ((dom = pffinddomain(rtcache_getdst(ro)->sa_family)) == NULL)
return;
LIST_INSERT_HEAD(&dom->dom_rtcache, ro, ro_rtcache_next);
rtcache_invariants(ro);
}
/*
* Packet routing routines.
*/
struct rtentry *
rtalloc1(const struct sockaddr *dst, int report)
{
rtbl_t *rtbl = rt_gettable(dst->sa_family);
struct rtentry *rt;
struct rtentry *newrt = NULL;
struct rt_addrinfo info;
int s = splsoftnet(), err = 0, msgtype = RTM_MISS;
if (rtbl != NULL && (rt = rt_matchaddr(rtbl, dst)) != NULL) {
newrt = rt;
if (report && (rt->rt_flags & RTF_CLONING)) {
err = rtrequest(RTM_RESOLVE, dst, NULL, NULL, 0,
&newrt);
if (err) {
newrt = rt;
rt->rt_refcnt++;
goto miss;
}
KASSERT(newrt != NULL);
if ((rt = newrt) && (rt->rt_flags & RTF_XRESOLVE)) {
msgtype = RTM_RESOLVE;
goto miss;
}
/* Inform listeners of the new route */
memset(&info, 0, sizeof(info));
info.rti_info[RTAX_DST] = rt_getkey(rt);
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
if (rt->rt_ifp != NULL) {
info.rti_info[RTAX_IFP] =
rt->rt_ifp->if_dl->ifa_addr;
info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
}
rt_missmsg(RTM_ADD, &info, rt->rt_flags, 0);
} else
rt->rt_refcnt++;
} else {
rtstat.rts_unreach++;
miss: if (report) {
memset((void *)&info, 0, sizeof(info));
info.rti_info[RTAX_DST] = dst;
rt_missmsg(msgtype, &info, 0, err);
}
}
splx(s);
return newrt;
}
void
rtfree(struct rtentry *rt)
{
struct ifaddr *ifa;
if (rt == NULL)
panic("rtfree");
rt->rt_refcnt--;
if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_UP) == 0) {
rt_assert_inactive(rt);
rttrash--;
if (rt->rt_refcnt < 0) {
printf("rtfree: %p not freed (neg refs)\n", rt);
return;
}
rt_timer_remove_all(rt, 0);
ifa = rt->rt_ifa;
rt->rt_ifa = NULL;
IFAFREE(ifa);
rt->rt_ifp = NULL;
rt_destroy(rt);
pool_put(&rtentry_pool, rt);
}
}
void
ifafree(struct ifaddr *ifa)
{
#ifdef DIAGNOSTIC
if (ifa == NULL)
panic("ifafree: null ifa");
if (ifa->ifa_refcnt != 0)
panic("ifafree: ifa_refcnt != 0 (%d)", ifa->ifa_refcnt);
#endif
#ifdef IFAREF_DEBUG
printf("ifafree: freeing ifaddr %p\n", ifa);
#endif
free(ifa, M_IFADDR);
}
/*
* Force a routing table entry to the specified
* destination to go through the given gateway.
* Normally called as a result of a routing redirect
* message from the network layer.
*
* N.B.: must be called at splsoftnet
*/
void
rtredirect(const struct sockaddr *dst, const struct sockaddr *gateway,
const struct sockaddr *netmask, int flags, const struct sockaddr *src,
struct rtentry **rtp)
{
struct rtentry *rt;
int error = 0;
uint64_t *stat = NULL;
struct rt_addrinfo info;
struct ifaddr *ifa;
/* verify the gateway is directly reachable */
if ((ifa = ifa_ifwithnet(gateway)) == NULL) {
error = ENETUNREACH;
goto out;
}
rt = rtalloc1(dst, 0);
/*
* If the redirect isn't from our current router for this dst,
* it's either old or wrong. If it redirects us to ourselves,
* we have a routing loop, perhaps as a result of an interface
* going down recently.
*/
if (!(flags & RTF_DONE) && rt &&
(sockaddr_cmp(src, rt->rt_gateway) != 0 || rt->rt_ifa != ifa))
error = EINVAL;
else if (ifa_ifwithaddr(gateway))
error = EHOSTUNREACH;
if (error)
goto done;
/*
* Create a new entry if we just got back a wildcard entry
* or the lookup failed. This is necessary for hosts
* which use routing redirects generated by smart gateways
* to dynamically build the routing tables.
*/
if (rt == NULL || (rt_mask(rt) && rt_mask(rt)->sa_len < 2))
goto create;
/*
* Don't listen to the redirect if it's
* for a route to an interface.
*/
if (rt->rt_flags & RTF_GATEWAY) {
if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) {
/*
* Changing from route to net => route to host.
* Create new route, rather than smashing route to net.
*/
create:
if (rt != NULL)
rtfree(rt);
flags |= RTF_GATEWAY | RTF_DYNAMIC;
memset(&info, 0, sizeof(info));
info.rti_info[RTAX_DST] = dst;
info.rti_info[RTAX_GATEWAY] = gateway;
info.rti_info[RTAX_NETMASK] = netmask;
info.rti_ifa = ifa;
info.rti_flags = flags;
rt = NULL;
error = rtrequest1(RTM_ADD, &info, &rt);
if (rt != NULL)
flags = rt->rt_flags;
stat = &rtstat.rts_dynamic;
} else {
/*
* Smash the current notion of the gateway to
* this destination. Should check about netmask!!!
*/
rt->rt_flags |= RTF_MODIFIED;
flags |= RTF_MODIFIED;
stat = &rtstat.rts_newgateway;
rt_setgate(rt, gateway);
}
} else
error = EHOSTUNREACH;
done:
if (rt) {
if (rtp != NULL && !error)
*rtp = rt;
else
rtfree(rt);
}
out:
if (error)
rtstat.rts_badredirect++;
else if (stat != NULL)
(*stat)++;
memset(&info, 0, sizeof(info));
info.rti_info[RTAX_DST] = dst;
info.rti_info[RTAX_GATEWAY] = gateway;
info.rti_info[RTAX_NETMASK] = netmask;
info.rti_info[RTAX_AUTHOR] = src;
rt_missmsg(RTM_REDIRECT, &info, flags, error);
}
/*
* Delete a route and generate a message
*/
static int
rtdeletemsg(struct rtentry *rt)
{
int error;
struct rt_addrinfo info;
/*
* Request the new route so that the entry is not actually
* deleted. That will allow the information being reported to
* be accurate (and consistent with route_output()).
*/
memset(&info, 0, sizeof(info));
info.rti_info[RTAX_DST] = rt_getkey(rt);
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_flags = rt->rt_flags;
error = rtrequest1(RTM_DELETE, &info, &rt);
rt_missmsg(RTM_DELETE, &info, info.rti_flags, error);
/* Adjust the refcount */
if (error == 0 && rt->rt_refcnt <= 0) {
rt->rt_refcnt++;
rtfree(rt);
}
return error;
}
static int
rtflushclone1(struct rtentry *rt, void *arg)
{
struct rtentry *parent;
parent = (struct rtentry *)arg;
if ((rt->rt_flags & RTF_CLONED) != 0 && rt->rt_parent == parent)
rtdeletemsg(rt);
return 0;
}
static void
rtflushclone(sa_family_t family, struct rtentry *parent)
{
#ifdef DIAGNOSTIC
if (!parent || (parent->rt_flags & RTF_CLONING) == 0)
panic("rtflushclone: called with a non-cloning route");
#endif
rt_walktree(family, rtflushclone1, (void *)parent);
}
/*
* Routing table ioctl interface.
*/
int
rtioctl(u_long req, void *data, struct lwp *l)
{
return EOPNOTSUPP;
}
struct ifaddr *
ifa_ifwithroute(int flags, const struct sockaddr *dst,
const struct sockaddr *gateway)
{
struct ifaddr *ifa;
if ((flags & RTF_GATEWAY) == 0) {
/*
* If we are adding a route to an interface,
* and the interface is a pt to pt link
* we should search for the destination
* as our clue to the interface. Otherwise
* we can use the local address.
*/
ifa = NULL;
if ((flags & RTF_HOST) && gateway->sa_family != AF_LINK)
ifa = ifa_ifwithdstaddr(dst);
if (ifa == NULL)
ifa = ifa_ifwithaddr(gateway);
} else {
/*
* If we are adding a route to a remote net
* or host, the gateway may still be on the
* other end of a pt to pt link.
*/
ifa = ifa_ifwithdstaddr(gateway);
}
if (ifa == NULL)
ifa = ifa_ifwithnet(gateway);
if (ifa == NULL) {
struct rtentry *rt = rtalloc1(dst, 0);
if (rt == NULL)
return NULL;
rt->rt_refcnt--;
if ((ifa = rt->rt_ifa) == NULL)
return NULL;
}
if (ifa->ifa_addr->sa_family != dst->sa_family) {
struct ifaddr *oifa = ifa;
ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
if (ifa == NULL)
ifa = oifa;
}
return ifa;
}
int
rtrequest(int req, const struct sockaddr *dst, const struct sockaddr *gateway,
const struct sockaddr *netmask, int flags, struct rtentry **ret_nrt)
{
struct rt_addrinfo info;
memset(&info, 0, sizeof(info));
info.rti_flags = flags;
info.rti_info[RTAX_DST] = dst;
info.rti_info[RTAX_GATEWAY] = gateway;
info.rti_info[RTAX_NETMASK] = netmask;
return rtrequest1(req, &info, ret_nrt);
}
int
rt_getifa(struct rt_addrinfo *info)
{
struct ifaddr *ifa;
const struct sockaddr *dst = info->rti_info[RTAX_DST];
const struct sockaddr *gateway = info->rti_info[RTAX_GATEWAY];
const struct sockaddr *ifaaddr = info->rti_info[RTAX_IFA];
const struct sockaddr *ifpaddr = info->rti_info[RTAX_IFP];
int flags = info->rti_flags;
/*
* ifp may be specified by sockaddr_dl when protocol address
* is ambiguous
*/
if (info->rti_ifp == NULL && ifpaddr != NULL
&& ifpaddr->sa_family == AF_LINK &&
(ifa = ifa_ifwithnet(ifpaddr)) != NULL)
info->rti_ifp = ifa->ifa_ifp;
if (info->rti_ifa == NULL && ifaaddr != NULL)
info->rti_ifa = ifa_ifwithaddr(ifaaddr);
if (info->rti_ifa == NULL) {
const struct sockaddr *sa;
sa = ifaaddr != NULL ? ifaaddr :
(gateway != NULL ? gateway : dst);
if (sa != NULL && info->rti_ifp != NULL)
info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp);
else if (dst != NULL && gateway != NULL)
info->rti_ifa = ifa_ifwithroute(flags, dst, gateway);
else if (sa != NULL)
info->rti_ifa = ifa_ifwithroute(flags, sa, sa);
}
if ((ifa = info->rti_ifa) == NULL)
return ENETUNREACH;
if (ifa->ifa_getifa != NULL)
info->rti_ifa = ifa = (*ifa->ifa_getifa)(ifa, dst);
if (info->rti_ifp == NULL)
info->rti_ifp = ifa->ifa_ifp;
return 0;
}
int
rtrequest1(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt)
{
int s = splsoftnet();
int error = 0, rc;
struct rtentry *rt, *crt;
rtbl_t *rtbl;
struct ifaddr *ifa, *ifa2;
struct sockaddr_storage maskeddst;
const struct sockaddr *dst = info->rti_info[RTAX_DST];
const struct sockaddr *gateway = info->rti_info[RTAX_GATEWAY];
const struct sockaddr *netmask = info->rti_info[RTAX_NETMASK];
int flags = info->rti_flags;
#define senderr(x) { error = x ; goto bad; }
if ((rtbl = rt_gettable(dst->sa_family)) == NULL)
senderr(ESRCH);
if (flags & RTF_HOST)
netmask = NULL;
switch (req) {
case RTM_DELETE:
if (netmask) {
rt_maskedcopy(dst, (struct sockaddr *)&maskeddst,
netmask);
dst = (struct sockaddr *)&maskeddst;
}
if ((rt = rt_lookup(rtbl, dst, netmask)) == NULL)
senderr(ESRCH);
if ((rt->rt_flags & RTF_CLONING) != 0) {
/* clean up any cloned children */
rtflushclone(dst->sa_family, rt);
}
if ((rt = rt_deladdr(rtbl, dst, netmask)) == NULL)
senderr(ESRCH);
if (rt->rt_gwroute) {
RTFREE(rt->rt_gwroute);
rt->rt_gwroute = NULL;
}
if (rt->rt_parent) {
rt->rt_parent->rt_refcnt--;
rt->rt_parent = NULL;
}
rt->rt_flags &= ~RTF_UP;
if ((ifa = rt->rt_ifa)) {
if (ifa->ifa_flags & IFA_ROUTE &&
rt_ifa_connected(rt, ifa)) {
RT_DPRINTF("rt->_rt_key = %p, ifa = %p, "
"deleted IFA_ROUTE\n",
(void *)rt->_rt_key, (void *)ifa);
ifa->ifa_flags &= ~IFA_ROUTE;
}
if (ifa->ifa_rtrequest)
ifa->ifa_rtrequest(RTM_DELETE, rt, info);
}
rttrash++;
if (ret_nrt)
*ret_nrt = rt;
else if (rt->rt_refcnt <= 0) {
rt->rt_refcnt++;
rtfree(rt);
}
break;
case RTM_RESOLVE:
if (ret_nrt == NULL || (rt = *ret_nrt) == NULL)
senderr(EINVAL);
if ((rt->rt_flags & RTF_CLONING) == 0)
senderr(EINVAL);
ifa = rt->rt_ifa;
flags = rt->rt_flags & ~(RTF_CLONING | RTF_STATIC);
flags |= RTF_CLONED;
gateway = rt->rt_gateway;
flags |= RTF_HOST;
goto makeroute;
case RTM_ADD:
if (info->rti_ifa == NULL && (error = rt_getifa(info)))
senderr(error);
ifa = info->rti_ifa;
makeroute:
/* Already at splsoftnet() so pool_get/pool_put are safe */
rt = pool_get(&rtentry_pool, PR_NOWAIT);
if (rt == NULL)
senderr(ENOBUFS);
memset(rt, 0, sizeof(*rt));
rt->rt_flags = RTF_UP | flags;
LIST_INIT(&rt->rt_timer);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (rt_setkey(rt, dst, M_NOWAIT) == NULL ||
rt_setgate(rt, gateway) != 0) {
pool_put(&rtentry_pool, rt);
senderr(ENOBUFS);
}
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (netmask) {
rt_maskedcopy(dst, (struct sockaddr *)&maskeddst,
netmask);
rt_setkey(rt, (struct sockaddr *)&maskeddst, M_NOWAIT);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
} else {
rt_setkey(rt, dst, M_NOWAIT);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
}
rt_set_ifa(rt, ifa);
if (info->rti_info[RTAX_TAG] != NULL)
rt_settag(rt, info->rti_info[RTAX_TAG]);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (info->rti_info[RTAX_IFP] != NULL &&
(ifa2 = ifa_ifwithnet(info->rti_info[RTAX_IFP])) != NULL &&
ifa2->ifa_ifp != NULL)
rt->rt_ifp = ifa2->ifa_ifp;
else
rt->rt_ifp = ifa->ifa_ifp;
if (req == RTM_RESOLVE) {
rt->rt_rmx = (*ret_nrt)->rt_rmx; /* copy metrics */
rt->rt_parent = *ret_nrt;
rt->rt_parent->rt_refcnt++;
}
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
rc = rt_addaddr(rtbl, rt, netmask);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (rc != 0 && (crt = rtalloc1(rt_getkey(rt), 0)) != NULL) {
/* overwrite cloned route */
if ((crt->rt_flags & RTF_CLONED) != 0) {
rtdeletemsg(crt);
rc = rt_addaddr(rtbl, rt, netmask);
}
RTFREE(crt);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
}
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (rc != 0) {
IFAFREE(ifa);
if ((rt->rt_flags & RTF_CLONED) != 0 && rt->rt_parent)
rtfree(rt->rt_parent);
if (rt->rt_gwroute)
rtfree(rt->rt_gwroute);
rt_destroy(rt);
pool_put(&rtentry_pool, rt);
senderr(rc);
}
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (ifa->ifa_rtrequest)
ifa->ifa_rtrequest(req, rt, info);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (ret_nrt) {
*ret_nrt = rt;
rt->rt_refcnt++;
}
if ((rt->rt_flags & RTF_CLONING) != 0) {
/* clean up any cloned children */
rtflushclone(dst->sa_family, rt);
}
rtflushall(dst->sa_family);
break;
case RTM_GET:
if (netmask != NULL) {
rt_maskedcopy(dst, (struct sockaddr *)&maskeddst,
netmask);
dst = (struct sockaddr *)&maskeddst;
}
if ((rt = rt_lookup(rtbl, dst, netmask)) == NULL)
senderr(ESRCH);
if (ret_nrt != NULL) {
*ret_nrt = rt;
rt->rt_refcnt++;
}
break;
}
bad:
splx(s);
return error;
}
int
rt_setgate(struct rtentry *rt, const struct sockaddr *gate)
{
KASSERT(rt != rt->rt_gwroute);
KASSERT(rt->_rt_key != NULL);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (rt->rt_gwroute) {
RTFREE(rt->rt_gwroute);
rt->rt_gwroute = NULL;
}
KASSERT(rt->_rt_key != NULL);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (rt->rt_gateway != NULL)
sockaddr_free(rt->rt_gateway);
KASSERT(rt->_rt_key != NULL);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if ((rt->rt_gateway = sockaddr_dup(gate, M_NOWAIT)) == NULL)
return ENOMEM;
KASSERT(rt->_rt_key != NULL);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (rt->rt_flags & RTF_GATEWAY) {
KASSERT(rt->_rt_key != NULL);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
rt->rt_gwroute = rtalloc1(gate, 1);
/*
* If we switched gateways, grab the MTU from the new
* gateway route if the current MTU, if the current MTU is
* greater than the MTU of gateway.
* Note that, if the MTU of gateway is 0, we will reset the
* MTU of the route to run PMTUD again from scratch. XXX
*/
KASSERT(rt->_rt_key != NULL);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
if (rt->rt_gwroute
&& !(rt->rt_rmx.rmx_locks & RTV_MTU)
&& rt->rt_rmx.rmx_mtu
&& rt->rt_rmx.rmx_mtu > rt->rt_gwroute->rt_rmx.rmx_mtu) {
rt->rt_rmx.rmx_mtu = rt->rt_gwroute->rt_rmx.rmx_mtu;
}
}
KASSERT(rt->_rt_key != NULL);
RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key);
return 0;
}
void
rt_maskedcopy(const struct sockaddr *src, struct sockaddr *dst,
const struct sockaddr *netmask)
{
const char *netmaskp = &netmask->sa_data[0],
*srcp = &src->sa_data[0];
char *dstp = &dst->sa_data[0];
const char *maskend = (char *)dst + MIN(netmask->sa_len, src->sa_len);
const char *srcend = (char *)dst + src->sa_len;
dst->sa_len = src->sa_len;
dst->sa_family = src->sa_family;
while (dstp < maskend)
*dstp++ = *srcp++ & *netmaskp++;
if (dstp < srcend)
memset(dstp, 0, (size_t)(srcend - dstp));
}
/*
* Set up or tear down a routing table entry, normally
* for an interface.
*/
int
rtinit(struct ifaddr *ifa, int cmd, int flags)
{
struct rtentry *rt;
struct sockaddr *dst, *odst;
struct sockaddr_storage maskeddst;
struct rtentry *nrt = NULL;
int error;
struct rt_addrinfo info;
struct sockaddr_dl *sdl;
const struct sockaddr_dl *ifsdl;
dst = flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr;
if (cmd == RTM_DELETE) {
if ((flags & RTF_HOST) == 0 && ifa->ifa_netmask) {
/* Delete subnet route for this interface */
odst = dst;
dst = (struct sockaddr *)&maskeddst;
rt_maskedcopy(odst, dst, ifa->ifa_netmask);
}
if ((rt = rtalloc1(dst, 0)) != NULL) {
rt->rt_refcnt--;
if (rt->rt_ifa != ifa)
return (flags & RTF_HOST) ? EHOSTUNREACH
: ENETUNREACH;
}
}
memset(&info, 0, sizeof(info));
info.rti_ifa = ifa;
info.rti_flags = flags | ifa->ifa_flags;
info.rti_info[RTAX_DST] = dst;
info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr;
/*
* XXX here, it seems that we are assuming that ifa_netmask is NULL
* for RTF_HOST. bsdi4 passes NULL explicitly (via intermediate
* variable) when RTF_HOST is 1. still not sure if i can safely
* change it to meet bsdi4 behavior.
*/
if (cmd != RTM_LLINFO_UPD)
info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
error = rtrequest1((cmd == RTM_LLINFO_UPD) ? RTM_GET : cmd, &info,
&nrt);
if (error != 0 || (rt = nrt) == NULL)
;
else switch (cmd) {
case RTM_DELETE:
rt_newaddrmsg(cmd, ifa, error, nrt);
if (rt->rt_refcnt <= 0) {
rt->rt_refcnt++;
rtfree(rt);
}
break;
case RTM_LLINFO_UPD:
rt->rt_refcnt--;
RT_DPRINTF("%s: updating%s\n", __func__,
((rt->rt_flags & RTF_LLINFO) == 0) ? " (no llinfo)" : "");
ifsdl = ifa->ifa_ifp->if_sadl;
if ((rt->rt_flags & RTF_LLINFO) != 0 &&
(sdl = satosdl(rt->rt_gateway)) != NULL &&
sdl->sdl_family == AF_LINK &&
sockaddr_dl_setaddr(sdl, sdl->sdl_len, CLLADDR(ifsdl),
ifa->ifa_ifp->if_addrlen) == NULL) {
error = EINVAL;
break;
}
if (cmd == RTM_LLINFO_UPD && ifa->ifa_rtrequest != NULL)
ifa->ifa_rtrequest(RTM_LLINFO_UPD, rt, &info);
rt_newaddrmsg(RTM_CHANGE, ifa, error, nrt);
break;
case RTM_ADD:
rt->rt_refcnt--;
if (rt->rt_ifa != ifa) {
printf("rtinit: wrong ifa (%p) was (%p)\n", ifa,
rt->rt_ifa);
if (rt->rt_ifa->ifa_rtrequest != NULL) {
rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt,
&info);
}
rt_replace_ifa(rt, ifa);
rt->rt_ifp = ifa->ifa_ifp;
if (ifa->ifa_rtrequest != NULL)
ifa->ifa_rtrequest(RTM_ADD, rt, &info);
}
rt_newaddrmsg(cmd, ifa, error, nrt);
break;
}
return error;
}
/*
* Route timer routines. These routes allow functions to be called
* for various routes at any time. This is useful in supporting
* path MTU discovery and redirect route deletion.
*
* This is similar to some BSDI internal functions, but it provides
* for multiple queues for efficiency's sake...
*/
LIST_HEAD(, rttimer_queue) rttimer_queue_head;
static int rt_init_done = 0;
#define RTTIMER_CALLOUT(r) do { \
if (r->rtt_func != NULL) { \
(*r->rtt_func)(r->rtt_rt, r); \
} else { \
rtrequest((int) RTM_DELETE, \
rt_getkey(r->rtt_rt), \
0, 0, 0, 0); \
} \
} while (/*CONSTCOND*/0)
/*
* Some subtle order problems with domain initialization mean that
* we cannot count on this being run from rt_init before various
* protocol initializations are done. Therefore, we make sure
* that this is run when the first queue is added...
*/
void
rt_timer_init(void)
{
assert(rt_init_done == 0);
LIST_INIT(&rttimer_queue_head);
callout_init(&rt_timer_ch, 0);
callout_reset(&rt_timer_ch, hz, rt_timer_timer, NULL);
rt_init_done = 1;
}
struct rttimer_queue *
rt_timer_queue_create(u_int timeout)
{
struct rttimer_queue *rtq;
if (rt_init_done == 0)
rt_timer_init();
R_Malloc(rtq, struct rttimer_queue *, sizeof *rtq);
if (rtq == NULL)
return NULL;
memset(rtq, 0, sizeof(*rtq));
rtq->rtq_timeout = timeout;
TAILQ_INIT(&rtq->rtq_head);
LIST_INSERT_HEAD(&rttimer_queue_head, rtq, rtq_link);
return rtq;
}
void
rt_timer_queue_change(struct rttimer_queue *rtq, long timeout)
{
rtq->rtq_timeout = timeout;
}
void
rt_timer_queue_remove_all(struct rttimer_queue *rtq, int destroy)
{
struct rttimer *r;
while ((r = TAILQ_FIRST(&rtq->rtq_head)) != NULL) {
LIST_REMOVE(r, rtt_link);
TAILQ_REMOVE(&rtq->rtq_head, r, rtt_next);
if (destroy)
RTTIMER_CALLOUT(r);
/* we are already at splsoftnet */
pool_put(&rttimer_pool, r);
if (rtq->rtq_count > 0)
rtq->rtq_count--;
else
printf("rt_timer_queue_remove_all: "
"rtq_count reached 0\n");
}
}
void
rt_timer_queue_destroy(struct rttimer_queue *rtq, int destroy)
{
rt_timer_queue_remove_all(rtq, destroy);
LIST_REMOVE(rtq, rtq_link);
/*
* Caller is responsible for freeing the rttimer_queue structure.
*/
}
unsigned long
rt_timer_count(struct rttimer_queue *rtq)
{
return rtq->rtq_count;
}
void
rt_timer_remove_all(struct rtentry *rt, int destroy)
{
struct rttimer *r;
while ((r = LIST_FIRST(&rt->rt_timer)) != NULL) {
LIST_REMOVE(r, rtt_link);
TAILQ_REMOVE(&r->rtt_queue->rtq_head, r, rtt_next);
if (destroy)
RTTIMER_CALLOUT(r);
if (r->rtt_queue->rtq_count > 0)
r->rtt_queue->rtq_count--;
else
printf("rt_timer_remove_all: rtq_count reached 0\n");
/* we are already at splsoftnet */
pool_put(&rttimer_pool, r);
}
}
int
rt_timer_add(struct rtentry *rt,
void (*func)(struct rtentry *, struct rttimer *),
struct rttimer_queue *queue)
{
struct rttimer *r;
int s;
/*
* If there's already a timer with this action, destroy it before
* we add a new one.
*/
LIST_FOREACH(r, &rt->rt_timer, rtt_link) {
if (r->rtt_func == func)
break;
}
if (r != NULL) {
LIST_REMOVE(r, rtt_link);
TAILQ_REMOVE(&r->rtt_queue->rtq_head, r, rtt_next);
if (r->rtt_queue->rtq_count > 0)
r->rtt_queue->rtq_count--;
else
printf("rt_timer_add: rtq_count reached 0\n");
} else {
s = splsoftnet();
r = pool_get(&rttimer_pool, PR_NOWAIT);
splx(s);
if (r == NULL)
return ENOBUFS;
}
memset(r, 0, sizeof(*r));
r->rtt_rt = rt;
r->rtt_time = time_uptime;
r->rtt_func = func;
r->rtt_queue = queue;
LIST_INSERT_HEAD(&rt->rt_timer, r, rtt_link);
TAILQ_INSERT_TAIL(&queue->rtq_head, r, rtt_next);
r->rtt_queue->rtq_count++;
return 0;
}
/* ARGSUSED */
void
rt_timer_timer(void *arg)
{
struct rttimer_queue *rtq;
struct rttimer *r;
int s;
s = splsoftnet();
LIST_FOREACH(rtq, &rttimer_queue_head, rtq_link) {
while ((r = TAILQ_FIRST(&rtq->rtq_head)) != NULL &&
(r->rtt_time + rtq->rtq_timeout) < time_uptime) {
LIST_REMOVE(r, rtt_link);
TAILQ_REMOVE(&rtq->rtq_head, r, rtt_next);
RTTIMER_CALLOUT(r);
pool_put(&rttimer_pool, r);
if (rtq->rtq_count > 0)
rtq->rtq_count--;
else
printf("rt_timer_timer: rtq_count reached 0\n");
}
}
splx(s);
callout_reset(&rt_timer_ch, hz, rt_timer_timer, NULL);
}
static struct rtentry *
_rtcache_init(struct route *ro, int flag)
{
rtcache_invariants(ro);
KASSERT(ro->_ro_rt == NULL);
if (rtcache_getdst(ro) == NULL)
return NULL;
ro->ro_invalid = false;
if ((ro->_ro_rt = rtalloc1(rtcache_getdst(ro), flag)) != NULL)
rtcache(ro);
rtcache_invariants(ro);
return ro->_ro_rt;
}
struct rtentry *
rtcache_init(struct route *ro)
{
return _rtcache_init(ro, 1);
}
struct rtentry *
rtcache_init_noclone(struct route *ro)
{
return _rtcache_init(ro, 0);
}
struct rtentry *
rtcache_update(struct route *ro, int clone)
{
rtcache_clear(ro);
return _rtcache_init(ro, clone);
}
void
rtcache_copy(struct route *new_ro, const struct route *old_ro)
{
struct rtentry *rt;
KASSERT(new_ro != old_ro);
rtcache_invariants(new_ro);
rtcache_invariants(old_ro);
if ((rt = rtcache_validate(old_ro)) != NULL)
rt->rt_refcnt++;
if (rtcache_getdst(old_ro) == NULL ||
rtcache_setdst(new_ro, rtcache_getdst(old_ro)) != 0)
return;
new_ro->ro_invalid = false;
if ((new_ro->_ro_rt = rt) != NULL)
rtcache(new_ro);
rtcache_invariants(new_ro);
}
static struct dom_rtlist invalid_routes = LIST_HEAD_INITIALIZER(dom_rtlist);
void
rtcache_invalidate(struct dom_rtlist *rtlist)
{
struct route *ro;
while ((ro = LIST_FIRST(rtlist)) != NULL) {
rtcache_invariants(ro);
KASSERT(ro->_ro_rt != NULL);
ro->ro_invalid = true;
LIST_REMOVE(ro, ro_rtcache_next);
LIST_INSERT_HEAD(&invalid_routes, ro, ro_rtcache_next);
rtcache_invariants(ro);
}
}
void
rtcache_clear(struct route *ro)
{
rtcache_invariants(ro);
if (ro->_ro_rt == NULL)
return;
LIST_REMOVE(ro, ro_rtcache_next);
RTFREE(ro->_ro_rt);
ro->_ro_rt = NULL;
ro->ro_invalid = false;
rtcache_invariants(ro);
}
struct rtentry *
rtcache_lookup2(struct route *ro, const struct sockaddr *dst, int clone,
int *hitp)
{
const struct sockaddr *odst;
struct rtentry *rt = NULL;
rtcache_invariants(ro);
odst = rtcache_getdst(ro);
if (odst == NULL)
;
else if (sockaddr_cmp(odst, dst) != 0)
rtcache_free(ro);
else if ((rt = rtcache_validate(ro)) == NULL)
rtcache_clear(ro);
if (rt == NULL) {
*hitp = 0;
if (rtcache_setdst(ro, dst) == 0)
rt = _rtcache_init(ro, clone);
} else
*hitp = 1;
rtcache_invariants(ro);
return rt;
}
void
rtcache_free(struct route *ro)
{
rtcache_clear(ro);
if (ro->ro_sa != NULL) {
sockaddr_free(ro->ro_sa);
ro->ro_sa = NULL;
}
rtcache_invariants(ro);
}
int
rtcache_setdst(struct route *ro, const struct sockaddr *sa)
{
KASSERT(sa != NULL);
rtcache_invariants(ro);
if (ro->ro_sa != NULL && ro->ro_sa->sa_family == sa->sa_family) {
rtcache_clear(ro);
if (sockaddr_copy(ro->ro_sa, ro->ro_sa->sa_len, sa) != NULL) {
rtcache_invariants(ro);
return 0;
}
sockaddr_free(ro->ro_sa);
} else if (ro->ro_sa != NULL)
rtcache_free(ro); /* free ro_sa, wrong family */
KASSERT(ro->_ro_rt == NULL);
if ((ro->ro_sa = sockaddr_dup(sa, M_NOWAIT)) == NULL) {
rtcache_invariants(ro);
return ENOMEM;
}
rtcache_invariants(ro);
return 0;
}
const struct sockaddr *
rt_settag(struct rtentry *rt, const struct sockaddr *tag)
{
if (rt->rt_tag != tag) {
if (rt->rt_tag != NULL)
sockaddr_free(rt->rt_tag);
rt->rt_tag = sockaddr_dup(tag, M_NOWAIT);
}
return rt->rt_tag;
}
struct sockaddr *
rt_gettag(struct rtentry *rt)
{
return rt->rt_tag;
}
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