[NETNS]: FIB rules API cleanup.

Remove struct net from fib_rules_register(unregister)/notify_change
paths and diet code size a bit.

add/remove: 0/0 grow/shrink: 10/12 up/down: 35/-100 (-65)
function                                     old     new   delta
notify_rule_change                           273     280      +7
trie_show_stats                              471     475      +4
fn_trie_delete                               473     477      +4
fib_rules_unregister                         144     148      +4
fib4_rule_compare                            119     123      +4
resize                                      2842    2845      +3
fn_trie_select_default                       515     518      +3
inet_sk_rebuild_header                       836     838      +2
fib_trie_seq_show                            764     766      +2
__devinet_sysctl_register                    276     278      +2
fn_trie_lookup                              1124    1123      -1
ip_fib_check_default                         133     131      -2
devinet_conf_sysctl                          223     221      -2
snmp_fold_field                              126     123      -3
fn_trie_insert                              2091    2086      -5
inet_create                                  876     870      -6
fib4_rules_init                              197     191      -6
fib_sync_down                                452     444      -8
inet_gso_send_check                          334     325      -9
fib_create_info                             3003    2991     -12
fib_nl_delrule                               568     553     -15
fib_nl_newrule                               883     852     -31

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/fib_rules.h

@@ -102,8 +102,8 @@ static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 	return frh->table;
 }
 
-extern int fib_rules_register(struct net *, struct fib_rules_ops *);
-extern void fib_rules_unregister(struct net *, struct fib_rules_ops *);
+extern int fib_rules_register(struct fib_rules_ops *);
+extern void fib_rules_unregister(struct fib_rules_ops *);
 extern void                     fib_rules_cleanup_ops(struct fib_rules_ops *);
 
 extern int			fib_rules_lookup(struct fib_rules_ops *,

net/core/fib_rules.c

@@ -37,8 +37,7 @@ int fib_default_rule_add(struct fib_rules_ops *ops,
 }
 EXPORT_SYMBOL(fib_default_rule_add);
 
-static void notify_rule_change(struct net *net, int event,
-			       struct fib_rule *rule,
+static void notify_rule_change(int event, struct fib_rule *rule,
 			       struct fib_rules_ops *ops, struct nlmsghdr *nlh,
 			       u32 pid);
 
@@ -72,10 +71,13 @@ static void flush_route_cache(struct fib_rules_ops *ops)
 		ops->flush_cache();
 }
 
-int fib_rules_register(struct net *net, struct fib_rules_ops *ops)
+int fib_rules_register(struct fib_rules_ops *ops)
 {
 	int err = -EEXIST;
 	struct fib_rules_ops *o;
+	struct net *net;
+
+	net = ops->fro_net;
 
 	if (ops->rule_size < sizeof(struct fib_rule))
 		return -EINVAL;
@@ -112,8 +114,9 @@ void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
 }
 EXPORT_SYMBOL_GPL(fib_rules_cleanup_ops);
 
-void fib_rules_unregister(struct net *net, struct fib_rules_ops *ops)
+void fib_rules_unregister(struct fib_rules_ops *ops)
 {
+	struct net *net = ops->fro_net;
 
 	spin_lock(&net->rules_mod_lock);
 	list_del_rcu(&ops->list);
@@ -333,7 +336,7 @@ static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 	else
 		list_add_rcu(&rule->list, &ops->rules_list);
 
-	notify_rule_change(net, RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
+	notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
 	flush_route_cache(ops);
 	rules_ops_put(ops);
 	return 0;
@@ -423,7 +426,7 @@ static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 		}
 
 		synchronize_rcu();
-		notify_rule_change(net, RTM_DELRULE, rule, ops, nlh,
+		notify_rule_change(RTM_DELRULE, rule, ops, nlh,
 				   NETLINK_CB(skb).pid);
 		fib_rule_put(rule);
 		flush_route_cache(ops);
@@ -561,13 +564,15 @@ static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
 	return skb->len;
 }
 
-static void notify_rule_change(struct net *net, int event, struct fib_rule *rule,
+static void notify_rule_change(int event, struct fib_rule *rule,
 			       struct fib_rules_ops *ops, struct nlmsghdr *nlh,
 			       u32 pid)
 {
+	struct net *net;
 	struct sk_buff *skb;
 	int err = -ENOBUFS;
 
+	net = ops->fro_net;
 	skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
 	if (skb == NULL)
 		goto errout;
@@ -579,6 +584,7 @@ static void notify_rule_change(struct net *net, int event, struct fib_rule *rule
 		kfree_skb(skb);
 		goto errout;
 	}
+
 	err = rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
 errout:
 	if (err < 0)

net/decnet/dn_rules.c

@@ -256,12 +256,12 @@ void __init dn_fib_rules_init(void)
 {
 	BUG_ON(fib_default_rule_add(&dn_fib_rules_ops, 0x7fff,
 			            RT_TABLE_MAIN, 0));
-	fib_rules_register(&init_net, &dn_fib_rules_ops);
+	fib_rules_register(&dn_fib_rules_ops);
 }
 
 void __exit dn_fib_rules_cleanup(void)
 {
-	fib_rules_unregister(&init_net, &dn_fib_rules_ops);
+	fib_rules_unregister(&dn_fib_rules_ops);
 }
 
 

net/ipv4/fib_rules.c

@@ -317,7 +317,7 @@ int __net_init fib4_rules_init(struct net *net)
 	INIT_LIST_HEAD(&ops->rules_list);
 	ops->fro_net = net;
 
-	fib_rules_register(net, ops);
+	fib_rules_register(ops);
 
 	err = fib_default_rules_init(ops);
 	if (err < 0)
@@ -327,13 +327,13 @@ int __net_init fib4_rules_init(struct net *net)
 
 fail:
 	/* also cleans all rules already added */
-	fib_rules_unregister(net, ops);
+	fib_rules_unregister(ops);
 	kfree(ops);
 	return err;
 }
 
 void __net_exit fib4_rules_exit(struct net *net)
 {
-	fib_rules_unregister(net, net->ipv4.rules_ops);
+	fib_rules_unregister(net->ipv4.rules_ops);
 	kfree(net->ipv4.rules_ops);
 }

net/ipv6/fib6_rules.c

@@ -274,7 +274,7 @@ int __init fib6_rules_init(void)
 	if (ret)
 		goto out;
 
-	ret = fib_rules_register(&init_net, &fib6_rules_ops);
+	ret = fib_rules_register(&fib6_rules_ops);
 	if (ret)
 		goto out_default_rules_init;
 out:
@@ -287,5 +287,5 @@ out_default_rules_init:
 
 void fib6_rules_cleanup(void)
 {
-	fib_rules_unregister(&init_net, &fib6_rules_ops);
+	fib_rules_unregister(&fib6_rules_ops);
 }