ipv4: Avoid overhead when no custom FIB rules are installed.
If the user hasn't actually installed any custom rules, or fiddled
with the default ones, don't go through the whole FIB rules layer.
It's just pure overhead.
Instead do what we do with CONFIG_IP_MULTIPLE_TABLES disabled, check
the individual tables by hand, one by one.
Also, move fib_num_tclassid_users into the ipv4 network namespace.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 3dc7c96..539c672 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -220,11 +220,33 @@
extern u32 fib_rules_tclass(const struct fib_result *res);
#endif
-extern int fib_lookup(struct net *n, struct flowi4 *flp, struct fib_result *res);
-
extern struct fib_table *fib_new_table(struct net *net, u32 id);
extern struct fib_table *fib_get_table(struct net *net, u32 id);
+extern int __fib_lookup(struct net *net, struct flowi4 *flp,
+ struct fib_result *res);
+
+static inline int fib_lookup(struct net *net, struct flowi4 *flp,
+ struct fib_result *res)
+{
+ if (!net->ipv4.fib_has_custom_rules) {
+ if (net->ipv4.fib_local &&
+ !fib_table_lookup(net->ipv4.fib_local, flp, res,
+ FIB_LOOKUP_NOREF))
+ return 0;
+ if (net->ipv4.fib_main &&
+ !fib_table_lookup(net->ipv4.fib_main, flp, res,
+ FIB_LOOKUP_NOREF))
+ return 0;
+ if (net->ipv4.fib_default &&
+ !fib_table_lookup(net->ipv4.fib_default, flp, res,
+ FIB_LOOKUP_NOREF))
+ return 0;
+ return -ENETUNREACH;
+ }
+ return __fib_lookup(net, flp, res);
+}
+
#endif /* CONFIG_IP_MULTIPLE_TABLES */
/* Exported by fib_frontend.c */
@@ -236,9 +258,15 @@
struct in_device *idev, u32 *itag);
extern void fib_select_default(struct fib_result *res);
#ifdef CONFIG_IP_ROUTE_CLASSID
-extern int fib_num_tclassid_users;
+static inline int fib_num_tclassid_users(struct net *net)
+{
+ return net->ipv4.fib_num_tclassid_users;
+}
#else
-#define fib_num_tclassid_users 0
+static inline int fib_num_tclassid_users(struct net *net)
+{
+ return 0;
+}
#endif
/* Exported by fib_semantics.c */
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 227f0cd..599e48f 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -11,6 +11,7 @@
struct ipv4_devconf;
struct fib_rules_ops;
struct hlist_head;
+struct fib_table;
struct sock;
struct netns_ipv4 {
@@ -24,6 +25,13 @@
struct ipv4_devconf *devconf_dflt;
#ifdef CONFIG_IP_MULTIPLE_TABLES
struct fib_rules_ops *rules_ops;
+ bool fib_has_custom_rules;
+ struct fib_table *fib_local;
+ struct fib_table *fib_main;
+ struct fib_table *fib_default;
+#endif
+#ifdef CONFIG_IP_ROUTE_CLASSID
+ int fib_num_tclassid_users;
#endif
struct hlist_head *fib_table_hash;
struct sock *fibnl;