ipv4: Cache source address in nexthop entries.
When doing output route lookups, we have to select the source address
if the user has not specified an explicit one.
First, if the route has an explicit preferred source address
specified, then we use that.
Otherwise we search the route's outgoing interface for a suitable
address.
This search can be precomputed and cached at route insertion time.
The only missing part is that we have to refresh this precomputed
value any time addresses are added or removed from the interface, and
this is accomplished by fib_update_nh_saddrs().
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 523a170..0e14083 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -60,6 +60,7 @@
#endif
int nh_oif;
__be32 nh_gw;
+ __be32 nh_saddr;
};
/*
@@ -139,11 +140,13 @@
#endif /* CONFIG_IP_ROUTE_MULTIPATH */
-#define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
+#define FIB_RES_SADDR(res) (FIB_RES_NH(res).nh_saddr)
#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
+#define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : FIB_RES_SADDR(res))
+
struct fib_table {
struct hlist_node tb_hlist;
u32 tb_id;
@@ -224,8 +227,8 @@
extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
extern int fib_sync_down_dev(struct net_device *dev, int force);
extern int fib_sync_down_addr(struct net *net, __be32 local);
+extern void fib_update_nh_saddrs(struct net_device *dev);
extern int fib_sync_up(struct net_device *dev);
-extern __be32 __fib_res_prefsrc(struct fib_result *res);
extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
/* Exported by fib_trie.c */