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/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index b23fd95..c06da93 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -54,7 +54,7 @@
}
#endif
-int fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)
+int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)
{
struct fib_lookup_arg arg = {
.result = res,
@@ -67,7 +67,7 @@
return err;
}
-EXPORT_SYMBOL_GPL(fib_lookup);
+EXPORT_SYMBOL_GPL(__fib_lookup);
static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
int flags, struct fib_lookup_arg *arg)
@@ -172,7 +172,7 @@
if (tb[FRA_FLOW]) {
rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
if (rule4->tclassid)
- fib_num_tclassid_users++;
+ net->ipv4.fib_num_tclassid_users++;
}
#endif
@@ -182,6 +182,7 @@
rule4->dstmask = inet_make_mask(rule4->dst_len);
rule4->tos = frh->tos;
+ net->ipv4.fib_has_custom_rules = true;
err = 0;
errout:
return err;
@@ -189,12 +190,14 @@
static void fib4_rule_delete(struct fib_rule *rule)
{
+ struct net *net = rule->fr_net;
#ifdef CONFIG_IP_ROUTE_CLASSID
struct fib4_rule *rule4 = (struct fib4_rule *) rule;
if (rule4->tclassid)
- fib_num_tclassid_users--;
+ net->ipv4.fib_num_tclassid_users--;
#endif
+ net->ipv4.fib_has_custom_rules = true;
}
static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
@@ -309,6 +312,7 @@
if (err < 0)
goto fail;
net->ipv4.rules_ops = ops;
+ net->ipv4.fib_has_custom_rules = false;
return 0;
fail: