/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <netinet/in.h>
#include <netinet/in_var.h>
+extern int tvtohz(struct timeval *);
extern int in_inithead(void **head, int off);
#ifdef __APPLE__
static void in_rtqtimo(void *rock);
#endif
+static struct radix_node *in_matroute_args(void *, struct radix_node_head *,
+ rn_matchf_t *f, void *);
+
#define RTPRF_OURS RTF_PROTO3 /* set on routes we manage */
-extern lck_mtx_t *rt_mtx;
/*
* Do what we need to do when inserting a route.
struct sockaddr_in *sin = (struct sockaddr_in *)rt_key(rt);
struct radix_node *ret;
+ lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED);
+ RT_LOCK_ASSERT_HELD(rt);
+
/*
* For IP, all unicast non-host routes are automatically cloning.
*/
- if(IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
+ if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
rt->rt_flags |= RTF_MULTICAST;
- if(!(rt->rt_flags & (RTF_HOST | RTF_CLONING | RTF_MULTICAST))) {
+ if (!(rt->rt_flags & (RTF_HOST | RTF_CLONING | RTF_MULTICAST))) {
rt->rt_flags |= RTF_PRCLONING;
}
* Find out if it is because of an
* ARP entry and delete it if so.
*/
- rt2 = rtalloc1_locked((struct sockaddr *)sin, 0,
- RTF_CLONING | RTF_PRCLONING);
+ rt2 = rtalloc1_scoped_locked(rt_key(rt), 0,
+ RTF_CLONING | RTF_PRCLONING, sa_get_ifscope(rt_key(rt)));
if (rt2) {
- if (rt2->rt_flags & RTF_LLINFO &&
- rt2->rt_flags & RTF_HOST &&
- rt2->rt_gateway &&
- rt2->rt_gateway->sa_family == AF_LINK) {
- rtrequest_locked(RTM_DELETE,
- (struct sockaddr *)rt_key(rt2),
- rt2->rt_gateway,
- rt_mask(rt2), rt2->rt_flags, 0);
+ RT_LOCK(rt2);
+ if ((rt2->rt_flags & RTF_LLINFO) &&
+ (rt2->rt_flags & RTF_HOST) &&
+ rt2->rt_gateway != NULL &&
+ rt2->rt_gateway->sa_family == AF_LINK) {
+ /*
+ * Safe to drop rt_lock and use rt_key,
+ * rt_gateway, since holding rnh_lock here
+ * prevents another thread from calling
+ * rt_setgate() on this route.
+ */
+ RT_UNLOCK(rt2);
+ rtrequest_locked(RTM_DELETE, rt_key(rt2),
+ rt2->rt_gateway, rt_mask(rt2),
+ rt2->rt_flags, 0);
ret = rn_addroute(v_arg, n_arg, head,
treenodes);
+ } else {
+ RT_UNLOCK(rt2);
}
rtfree_locked(rt2);
}
return ret;
}
+/*
+ * Validate (unexpire) an expiring AF_INET route.
+ */
+struct radix_node *
+in_validate(struct radix_node *rn)
+{
+ struct rtentry *rt = (struct rtentry *)rn;
+
+ RT_LOCK_ASSERT_HELD(rt);
+
+ /* This is first reference? */
+ if (rt->rt_refcnt == 0 && (rt->rt_flags & RTPRF_OURS)) {
+ rt->rt_flags &= ~RTPRF_OURS;
+ rt->rt_rmx.rmx_expire = 0;
+ }
+ return (rn);
+}
+
+/*
+ * Similar to in_matroute_args except without the leaf-matching parameters.
+ */
+static struct radix_node *
+in_matroute(void *v_arg, struct radix_node_head *head)
+{
+ return (in_matroute_args(v_arg, head, NULL, NULL));
+}
+
/*
* This code is the inverse of in_clsroute: on first reference, if we
* were managing the route, stop doing so and set the expiration timer
* back off again.
*/
static struct radix_node *
-in_matroute(void *v_arg, struct radix_node_head *head)
+in_matroute_args(void *v_arg, struct radix_node_head *head,
+ rn_matchf_t *f, void *w)
{
- struct radix_node *rn = rn_match(v_arg, head);
- struct rtentry *rt = (struct rtentry *)rn;
+ struct radix_node *rn = rn_match_args(v_arg, head, f, w);
- if(rt && rt->rt_refcnt == 0) { /* this is first reference */
- if(rt->rt_flags & RTPRF_OURS) {
- rt->rt_flags &= ~RTPRF_OURS;
- rt->rt_rmx.rmx_expire = 0;
- }
+ if (rn != NULL) {
+ RT_LOCK_SPIN((struct rtentry *)rn);
+ in_validate(rn);
+ RT_UNLOCK((struct rtentry *)rn);
}
- return rn;
+ return (rn);
}
static int rtq_reallyold = 60*60;
&check_routeselfref , 0, "");
#endif
-__private_extern__ int use_routegenid = 1;
+int use_routegenid = 1;
SYSCTL_INT(_net_inet_ip, OID_AUTO, use_route_genid, CTLFLAG_RW,
&use_routegenid , 0, "");
* timed out.
*/
static void
-in_clsroute(struct radix_node *rn, struct radix_node_head *head)
+in_clsroute(struct radix_node *rn, __unused struct radix_node_head *head)
{
struct rtentry *rt = (struct rtentry *)rn;
- struct timeval timenow;
- if(!(rt->rt_flags & RTF_UP))
+ lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED);
+ RT_LOCK_ASSERT_HELD(rt);
+
+ if (!(rt->rt_flags & RTF_UP))
return; /* prophylactic measures */
- if((rt->rt_flags & (RTF_LLINFO | RTF_HOST)) != RTF_HOST)
+ if ((rt->rt_flags & (RTF_LLINFO | RTF_HOST)) != RTF_HOST)
return;
- if((rt->rt_flags & (RTF_WASCLONED | RTPRF_OURS))
- != RTF_WASCLONED)
+ if ((rt->rt_flags & (RTF_WASCLONED | RTPRF_OURS)) != RTF_WASCLONED)
return;
/*
- * As requested by David Greenman:
- * If rtq_reallyold is 0, just delete the route without
- * waiting for a timeout cycle to kill it.
+ * Delete the route immediately if RTF_DELCLONE is set or
+ * if route caching is disabled (rtq_reallyold set to 0).
+ * Otherwise, let it expire and be deleted by in_rtqkill().
*/
- if(rtq_reallyold != 0) {
+ if ((rt->rt_flags & RTF_DELCLONE) || rtq_reallyold == 0) {
+ /*
+ * Delete the route from the radix tree but since we are
+ * called when the route's reference count is 0, don't
+ * deallocate it until we return from this routine by
+ * telling rtrequest that we're interested in it.
+ * Safe to drop rt_lock and use rt_key, rt_gateway since
+ * holding rnh_lock here prevents another thread from
+ * calling rt_setgate() on this route.
+ */
+ RT_UNLOCK(rt);
+ if (rtrequest_locked(RTM_DELETE, (struct sockaddr *)rt_key(rt),
+ rt->rt_gateway, rt_mask(rt), rt->rt_flags, &rt) == 0) {
+ /* Now let the caller free it */
+ RT_LOCK(rt);
+ RT_REMREF_LOCKED(rt);
+ } else {
+ RT_LOCK(rt);
+ }
+ } else {
+ struct timeval timenow;
+
getmicrotime(&timenow);
rt->rt_flags |= RTPRF_OURS;
rt->rt_rmx.rmx_expire = timenow.tv_sec + rtq_reallyold;
- } else {
- rtrequest_locked(RTM_DELETE,
- (struct sockaddr *)rt_key(rt),
- rt->rt_gateway, rt_mask(rt),
- rt->rt_flags, 0);
}
}
struct timeval timenow;
getmicrotime(&timenow);
- lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_OWNED);
- if(rt->rt_flags & RTPRF_OURS) {
+ lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED);
+
+ RT_LOCK(rt);
+ if (rt->rt_flags & RTPRF_OURS) {
ap->found++;
- if(ap->draining || rt->rt_rmx.rmx_expire <= timenow.tv_sec) {
- if(rt->rt_refcnt > 0)
+ if (ap->draining || rt->rt_rmx.rmx_expire <= timenow.tv_sec) {
+ if (rt->rt_refcnt > 0)
panic("rtqkill route really not free");
- err = rtrequest_locked(RTM_DELETE,
- (struct sockaddr *)rt_key(rt),
- rt->rt_gateway, rt_mask(rt),
- rt->rt_flags, 0);
- if(err) {
+ /*
+ * Delete this route since we're done with it;
+ * the route may be freed afterwards, so we
+ * can no longer refer to 'rt' upon returning
+ * from rtrequest(). Safe to drop rt_lock and
+ * use rt_key, rt_gateway since holding rnh_lock
+ * here prevents another thread from calling
+ * rt_setgate() on this route.
+ */
+ RT_UNLOCK(rt);
+ err = rtrequest_locked(RTM_DELETE, rt_key(rt),
+ rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
+ if (err) {
log(LOG_WARNING, "in_rtqkill: error %d\n", err);
} else {
ap->killed++;
}
} else {
- if(ap->updating
+ if (ap->updating
&& (rt->rt_rmx.rmx_expire - timenow.tv_sec
> rtq_reallyold)) {
rt->rt_rmx.rmx_expire = timenow.tv_sec
}
ap->nextstop = lmin(ap->nextstop,
rt->rt_rmx.rmx_expire);
+ RT_UNLOCK(rt);
}
+ } else {
+ RT_UNLOCK(rt);
}
return 0;
static time_t last_adjusted_timeout = 0;
struct timeval timenow;
+ lck_mtx_lock(rnh_lock);
+ /* Get the timestamp after we acquire the lock for better accuracy */
getmicrotime(&timenow);
+
arg.found = arg.killed = 0;
arg.rnh = rnh;
arg.nextstop = timenow.tv_sec + rtq_timeout;
arg.draining = arg.updating = 0;
- lck_mtx_lock(rt_mtx);
rnh->rnh_walktree(rnh, in_rtqkill, &arg);
/*
atv.tv_usec = 0;
atv.tv_sec = arg.nextstop - timenow.tv_sec;
- lck_mtx_unlock(rt_mtx);
+ lck_mtx_unlock(rnh_lock);
timeout(in_rtqtimo_funnel, rock, tvtohz(&atv));
}
arg.nextstop = 0;
arg.draining = 1;
arg.updating = 0;
- lck_mtx_lock(rt_mtx);
+ lck_mtx_lock(rnh_lock);
rnh->rnh_walktree(rnh, in_rtqkill, &arg);
- lck_mtx_unlock(rt_mtx);
+ lck_mtx_unlock(rnh_lock);
}
/*
rnh = *head;
rnh->rnh_addaddr = in_addroute;
rnh->rnh_matchaddr = in_matroute;
+ rnh->rnh_matchaddr_args = in_matroute_args;
rnh->rnh_close = in_clsroute;
in_rtqtimo(rnh); /* kick off timeout first time */
return 1;
struct rtentry *rt = (struct rtentry *)rn;
int err;
+ RT_LOCK(rt);
if (rt->rt_ifa == ap->ifa &&
(ap->del || !(rt->rt_flags & RTF_STATIC))) {
/*
* away the pointers that rn_walktree() needs in order
* continue our descent. We will end up deleting all
* the routes that rtrequest() would have in any case,
- * so that behavior is not needed there.
+ * so that behavior is not needed there. Safe to drop
+ * rt_lock and use rt_key, rt_gateway, since holding
+ * rnh_lock here prevents another thread from calling
+ * rt_setgate() on this route.
*/
rt->rt_flags &= ~(RTF_CLONING | RTF_PRCLONING);
- err = rtrequest_locked(RTM_DELETE, (struct sockaddr *)rt_key(rt),
- rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
+ RT_UNLOCK(rt);
+ err = rtrequest_locked(RTM_DELETE, rt_key(rt),
+ rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
if (err) {
log(LOG_WARNING, "in_ifadownkill: error %d\n", err);
}
+ } else {
+ RT_UNLOCK(rt);
}
return 0;
}
struct in_ifadown_arg arg;
struct radix_node_head *rnh;
- lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_OWNED);
+ lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED);
if (ifa->ifa_addr->sa_family != AF_INET)
return 1;
+ /* trigger route cache reevaluation */
+ if (use_routegenid)
+ routegenid_update();
+
arg.rnh = rnh = rt_tables[AF_INET];
arg.ifa = ifa;
arg.del = delete;
projects / apple / xnu.git / blobdiff