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authorDavid S. Miller <davem@davemloft.net>2011-03-24 17:42:21 -0700
committerDavid S. Miller <davem@davemloft.net>2011-03-24 17:42:21 -0700
commit436c3b66ec9824a633724ae42de1c416af4f2063 (patch)
tree8da6452386b6e900c4226c9b67694d1ea21e847e /include/net/ip_fib.h
parentf7594d42944c0dfca90318f50978a4bdf8504086 (diff)
ipv4: Invalidate nexthop cache nh_saddr more correctly.
Any operation that: 1) Brings up an interface 2) Adds an IP address to an interface 3) Deletes an IP address from an interface can potentially invalidate the nh_saddr value, requiring it to be recomputed. Perform the recomputation lazily using a generation ID. Reported-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ip_fib.h')
-rw-r--r--include/net/ip_fib.h12
1 files changed, 10 insertions, 2 deletions
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index a1a858035913..cd92b923a578 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -62,6 +62,7 @@ struct fib_nh {
int nh_oif;
__be32 nh_gw;
__be32 nh_saddr;
+ int nh_saddr_genid;
};
/*
@@ -141,12 +142,19 @@ struct fib_result_nl {
#endif /* CONFIG_IP_ROUTE_MULTIPATH */
-#define FIB_RES_SADDR(res) (FIB_RES_NH(res).nh_saddr)
+extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
+
+#define FIB_RES_SADDR(net, res) \
+ ((FIB_RES_NH(res).nh_saddr_genid == \
+ atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
+ FIB_RES_NH(res).nh_saddr : \
+ fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
#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))
+#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
+ FIB_RES_SADDR(net, res))
struct fib_table {
struct hlist_node tb_hlist;