/*
- * Copyright (c) 2000,2007 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <sys/sysctl.h>
#include <sys/socket.h>
#include <sys/mbuf.h>
+#include <sys/protosw.h>
#include <sys/syslog.h>
+#include <sys/mcache.h>
#include <kern/lock.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
+#include <netinet/in_arp.h>
extern int tvtohz(struct timeval *);
extern int in_inithead(void **head, int off);
-extern u_long route_generation;
#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 */
/*
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;
}
if (in_broadcast(sin->sin_addr, rt->rt_ifp)) {
rt->rt_flags |= RTF_BROADCAST;
} else {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(rt);
+ IFA_LOCK_SPIN(rt->rt_ifa);
#define satosin(sa) ((struct sockaddr_in *)sa)
if (satosin(rt->rt_ifa->ifa_addr)->sin_addr.s_addr
== sin->sin_addr.s_addr)
rt->rt_flags |= RTF_LOCAL;
#undef satosin
+ IFA_UNLOCK(rt->rt_ifa);
}
}
* 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, sin_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) {
+ if (rt->rt_flags & RTPRF_OURS) {
+ /* It's one of ours; unexpire it */
+ rt->rt_flags &= ~RTPRF_OURS;
+ rt_setexpire(rt, 0);
+ } else if ((rt->rt_flags & RTF_LLINFO) &&
+ (rt->rt_flags & RTF_HOST) && rt->rt_gateway != NULL &&
+ rt->rt_gateway->sa_family == AF_LINK) {
+ /* It's ARP; let it be handled there */
+ arp_validate(rt);
+ }
+ }
+ 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;
/* one hour is ``really old'' */
-SYSCTL_INT(_net_inet_ip, IPCTL_RTEXPIRE, rtexpire, CTLFLAG_RW,
+SYSCTL_INT(_net_inet_ip, IPCTL_RTEXPIRE, rtexpire, CTLFLAG_RW | CTLFLAG_LOCKED,
&rtq_reallyold , 0,
"Default expiration time on dynamically learned routes");
static int rtq_minreallyold = 10;
/* never automatically crank down to less */
-SYSCTL_INT(_net_inet_ip, IPCTL_RTMINEXPIRE, rtminexpire, CTLFLAG_RW,
+SYSCTL_INT(_net_inet_ip, IPCTL_RTMINEXPIRE, rtminexpire, CTLFLAG_RW | CTLFLAG_LOCKED,
&rtq_minreallyold , 0,
"Minimum time to attempt to hold onto dynamically learned routes");
static int rtq_toomany = 128;
/* 128 cached routes is ``too many'' */
-SYSCTL_INT(_net_inet_ip, IPCTL_RTMAXCACHE, rtmaxcache, CTLFLAG_RW,
+SYSCTL_INT(_net_inet_ip, IPCTL_RTMAXCACHE, rtmaxcache, CTLFLAG_RW | CTLFLAG_LOCKED,
&rtq_toomany , 0, "Upper limit on dynamically learned routes");
#ifdef __APPLE__
* If for some reason a circular route is needed, turn this sysctl (net.inet.ip.check_route_selfref) to zero.
*/
int check_routeselfref = 1;
-SYSCTL_INT(_net_inet_ip, OID_AUTO, check_route_selfref, CTLFLAG_RW,
+SYSCTL_INT(_net_inet_ip, OID_AUTO, check_route_selfref, CTLFLAG_RW | CTLFLAG_LOCKED,
&check_routeselfref , 0, "");
#endif
-__private_extern__ int use_routegenid = 1;
-SYSCTL_INT(_net_inet_ip, OID_AUTO, use_route_genid, CTLFLAG_RW,
+int use_routegenid = 1;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, use_route_genid, CTLFLAG_RW | CTLFLAG_LOCKED,
&use_routegenid , 0, "");
/*
{
struct rtentry *rt = (struct rtentry *)rn;
+ lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED);
+ RT_LOCK_ASSERT_HELD(rt);
+
if (!(rt->rt_flags & RTF_UP))
return; /* prophylactic measures */
* 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 */
- rtunref(rt);
+ RT_LOCK(rt);
+ RT_REMREF_LOCKED(rt);
+ } else {
+ RT_LOCK(rt);
}
} else {
- struct timeval timenow;
+ uint64_t timenow;
- getmicrotime(&timenow);
+ timenow = net_uptime();
rt->rt_flags |= RTPRF_OURS;
- rt->rt_rmx.rmx_expire = timenow.tv_sec + rtq_reallyold;
+ rt_setexpire(rt,
+ rt_expiry(rt, timenow, rtq_reallyold));
}
}
int killed;
int found;
int updating;
- time_t nextstop;
+ uint64_t nextstop;
};
/*
struct rtqk_arg *ap = rock;
struct rtentry *rt = (struct rtentry *)rn;
int err;
- struct timeval timenow;
+ uint64_t timenow;
- getmicrotime(&timenow);
- lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_OWNED);
+ timenow = net_uptime();
+ 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) {
+ VERIFY(rt->rt_expire == 0 || rt->rt_rmx.rmx_expire != 0);
+ VERIFY(rt->rt_expire != 0 || rt->rt_rmx.rmx_expire == 0);
+ if (ap->draining || rt->rt_expire <= timenow) {
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);
+ /*
+ * 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
- && (rt->rt_rmx.rmx_expire - timenow.tv_sec
- > rtq_reallyold)) {
- rt->rt_rmx.rmx_expire = timenow.tv_sec
- + rtq_reallyold;
+ if (ap->updating &&
+ (rt->rt_expire - timenow) >
+ rt_expiry(rt, 0, rtq_reallyold)) {
+ rt_setexpire(rt, rt_expiry(rt,
+ timenow, rtq_reallyold));
}
ap->nextstop = lmin(ap->nextstop,
- rt->rt_rmx.rmx_expire);
+ rt->rt_expire);
+ RT_UNLOCK(rt);
}
+ } else {
+ RT_UNLOCK(rt);
}
return 0;
struct radix_node_head *rnh = rock;
struct rtqk_arg arg;
struct timeval atv;
- static time_t last_adjusted_timeout = 0;
- struct timeval timenow;
+ static uint64_t last_adjusted_timeout = 0;
+ uint64_t timenow;
- lck_mtx_lock(rt_mtx);
+ lck_mtx_lock(rnh_lock);
/* Get the timestamp after we acquire the lock for better accuracy */
- getmicrotime(&timenow);
+ timenow = net_uptime();
arg.found = arg.killed = 0;
arg.rnh = rnh;
- arg.nextstop = timenow.tv_sec + rtq_timeout;
+ arg.nextstop = timenow + rtq_timeout;
arg.draining = arg.updating = 0;
rnh->rnh_walktree(rnh, in_rtqkill, &arg);
* hard.
*/
if((arg.found - arg.killed > rtq_toomany)
- && (timenow.tv_sec - last_adjusted_timeout >= rtq_timeout)
+ && ((timenow - last_adjusted_timeout) >= (uint64_t)rtq_timeout)
&& rtq_reallyold > rtq_minreallyold) {
rtq_reallyold = 2*rtq_reallyold / 3;
if(rtq_reallyold < rtq_minreallyold) {
rtq_reallyold = rtq_minreallyold;
}
- last_adjusted_timeout = timenow.tv_sec;
+ last_adjusted_timeout = timenow;
#if DIAGNOSTIC
log(LOG_DEBUG, "in_rtqtimo: adjusted rtq_reallyold to %d\n",
rtq_reallyold);
}
atv.tv_usec = 0;
- atv.tv_sec = arg.nextstop - timenow.tv_sec;
- lck_mtx_unlock(rt_mtx);
+ atv.tv_sec = arg.nextstop - timenow;
+ 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);
+ /*
+ * Holding rnh_lock here prevents the possibility of
+ * ifa from changing (e.g. in_ifinit), so it is safe
+ * to access its ifa_addr without locking.
+ */
if (ifa->ifa_addr->sa_family != AF_INET)
- return 1;
+ return (1);
/* trigger route cache reevaluation */
- if (use_routegenid)
- route_generation++;
+ if (use_routegenid)
+ routegenid_update();
arg.rnh = rnh = rt_tables[AF_INET];
arg.ifa = ifa;
arg.del = delete;
rnh->rnh_walktree(rnh, in_ifadownkill, &arg);
+ IFA_LOCK_SPIN(ifa);
ifa->ifa_flags &= ~IFA_ROUTE;
- return 0;
+ IFA_UNLOCK(ifa);
+ return (0);
}
projects / apple / xnu.git / blobdiff