[IPV4/IPV6/DECNET]: Small cleanup for fib rules.

This patch slightly cleanups FIB rules framework. rules_list as a pointer
on struct fib_rules_ops is useless. It is always assigned with a static
per/subsystem list in IPv4, IPv6 and DecNet.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Acked-by: NAlexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/fib_rules.h

@@ -65,7 +65,7 @@ struct fib_rules_ops
 
 	int			nlgroup;
 	const struct nla_policy	*policy;
-	struct list_head	*rules_list;
+	struct list_head	rules_list;
 	struct module		*owner;
 };
 

net/core/fib_rules.c

@@ -84,7 +84,7 @@ static void cleanup_ops(struct fib_rules_ops *ops)
 {
 	struct fib_rule *rule, *tmp;
 
-	list_for_each_entry_safe(rule, tmp, ops->rules_list, list) {
+	list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
 		list_del_rcu(&rule->list);
 		fib_rule_put(rule);
 	}
@@ -139,7 +139,7 @@ int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
 
 	rcu_read_lock();
 
-	list_for_each_entry_rcu(rule, ops->rules_list, list) {
+	list_for_each_entry_rcu(rule, &ops->rules_list, list) {
 jumped:
 		if (!fib_rule_match(rule, ops, fl, flags))
 			continue;
@@ -271,7 +271,7 @@ static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 		if (rule->target <= rule->pref)
 			goto errout_free;
 
-		list_for_each_entry(r, ops->rules_list, list) {
+		list_for_each_entry(r, &ops->rules_list, list) {
 			if (r->pref == rule->target) {
 				rule->ctarget = r;
 				break;
@@ -287,7 +287,7 @@ static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 	if (err < 0)
 		goto errout_free;
 
-	list_for_each_entry(r, ops->rules_list, list) {
+	list_for_each_entry(r, &ops->rules_list, list) {
 		if (r->pref > rule->pref)
 			break;
 		last = r;
@@ -300,7 +300,7 @@ static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 		 * There are unresolved goto rules in the list, check if
 		 * any of them are pointing to this new rule.
 		 */
-		list_for_each_entry(r, ops->rules_list, list) {
+		list_for_each_entry(r, &ops->rules_list, list) {
 			if (r->action == FR_ACT_GOTO &&
 			    r->target == rule->pref) {
 				BUG_ON(r->ctarget != NULL);
@@ -320,7 +320,7 @@ static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 	if (last)
 		list_add_rcu(&rule->list, &last->list);
 	else
-		list_add_rcu(&rule->list, ops->rules_list);
+		list_add_rcu(&rule->list, &ops->rules_list);
 
 	notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
 	flush_route_cache(ops);
@@ -359,7 +359,7 @@ static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 	if (err < 0)
 		goto errout;
 
-	list_for_each_entry(rule, ops->rules_list, list) {
+	list_for_each_entry(rule, &ops->rules_list, list) {
 		if (frh->action && (frh->action != rule->action))
 			continue;
 
@@ -402,7 +402,7 @@ static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 		 * actually been added.
 		 */
 		if (ops->nr_goto_rules > 0) {
-			list_for_each_entry(tmp, ops->rules_list, list) {
+			list_for_each_entry(tmp, &ops->rules_list, list) {
 				if (tmp->ctarget == rule) {
 					rcu_assign_pointer(tmp->ctarget, NULL);
 					ops->unresolved_rules++;
@@ -498,7 +498,7 @@ static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
 	int idx = 0;
 	struct fib_rule *rule;
 
-	list_for_each_entry(rule, ops->rules_list, list) {
+	list_for_each_entry(rule, &ops->rules_list, list) {
 		if (idx < cb->args[1])
 			goto skip;
 
@@ -608,12 +608,12 @@ static int fib_rules_event(struct notifier_block *this, unsigned long event,
 	switch (event) {
 	case NETDEV_REGISTER:
 		list_for_each_entry(ops, &rules_ops, list)
-			attach_rules(ops->rules_list, dev);
+			attach_rules(&ops->rules_list, dev);
 		break;
 
 	case NETDEV_UNREGISTER:
 		list_for_each_entry(ops, &rules_ops, list)
-			detach_rules(ops->rules_list, dev);
+			detach_rules(&ops->rules_list, dev);
 		break;
 	}
 

net/decnet/dn_rules.c

@@ -57,8 +57,6 @@ static struct dn_fib_rule default_rule = {
 	},
 };
 
-static LIST_HEAD(dn_fib_rules);
-
 
 int dn_fib_lookup(struct flowi *flp, struct dn_fib_res *res)
 {
@@ -228,9 +226,9 @@ static u32 dn_fib_rule_default_pref(void)
 	struct list_head *pos;
 	struct fib_rule *rule;
 
-	if (!list_empty(&dn_fib_rules)) {
-		pos = dn_fib_rules.next;
-		if (pos->next != &dn_fib_rules) {
+	if (!list_empty(&dn_fib_rules_ops.rules_list)) {
+		pos = dn_fib_rules_ops.rules_list.next;
+		if (pos->next != &dn_fib_rules_ops.rules_list) {
 			rule = list_entry(pos->next, struct fib_rule, list);
 			if (rule->pref)
 				return rule->pref - 1;
@@ -258,13 +256,14 @@ static struct fib_rules_ops dn_fib_rules_ops = {
 	.flush_cache	= dn_fib_rule_flush_cache,
 	.nlgroup	= RTNLGRP_DECnet_RULE,
 	.policy		= dn_fib_rule_policy,
-	.rules_list	= &dn_fib_rules,
+	.rules_list	= LIST_HEAD_INIT(dn_fib_rules_ops.rules_list),
 	.owner		= THIS_MODULE,
 };
 
 void __init dn_fib_rules_init(void)
 {
-	list_add_tail(&default_rule.common.list, &dn_fib_rules);
+	list_add_tail(&default_rule.common.list,
+			&dn_fib_rules_ops.rules_list);
 	fib_rules_register(&dn_fib_rules_ops);
 }
 

net/ipv4/fib_rules.c

@@ -76,8 +76,6 @@ static struct fib4_rule local_rule = {
 	},
 };
 
-static LIST_HEAD(fib4_rules);
-
 #ifdef CONFIG_NET_CLS_ROUTE
 u32 fib_rules_tclass(struct fib_result *res)
 {
@@ -279,9 +277,9 @@ static u32 fib4_rule_default_pref(void)
 	struct list_head *pos;
 	struct fib_rule *rule;
 
-	if (!list_empty(&fib4_rules)) {
-		pos = fib4_rules.next;
-		if (pos->next != &fib4_rules) {
+	if (!list_empty(&fib4_rules_ops.rules_list)) {
+		pos = fib4_rules_ops.rules_list.next;
+		if (pos->next != &fib4_rules_ops.rules_list) {
 			rule = list_entry(pos->next, struct fib_rule, list);
 			if (rule->pref)
 				return rule->pref - 1;
@@ -317,15 +315,15 @@ static struct fib_rules_ops fib4_rules_ops = {
 	.flush_cache	= fib4_rule_flush_cache,
 	.nlgroup	= RTNLGRP_IPV4_RULE,
 	.policy		= fib4_rule_policy,
-	.rules_list	= &fib4_rules,
+	.rules_list	= LIST_HEAD_INIT(fib4_rules_ops.rules_list),
 	.owner		= THIS_MODULE,
 };
 
 void __init fib4_rules_init(void)
 {
-	list_add_tail(&local_rule.common.list, &fib4_rules);
-	list_add_tail(&main_rule.common.list, &fib4_rules);
-	list_add_tail(&default_rule.common.list, &fib4_rules);
+	list_add_tail(&local_rule.common.list, &fib4_rules_ops.rules_list);
+	list_add_tail(&main_rule.common.list, &fib4_rules_ops.rules_list);
+	list_add_tail(&default_rule.common.list, &fib4_rules_ops.rules_list);
 
 	fib_rules_register(&fib4_rules_ops);
 }

net/ipv6/fib6_rules.c

@@ -50,8 +50,6 @@ static struct fib6_rule local_rule = {
 	},
 };
 
-static LIST_HEAD(fib6_rules);
-
 struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
 				   pol_lookup_t lookup)
 {
@@ -268,14 +266,14 @@ static struct fib_rules_ops fib6_rules_ops = {
 	.nlmsg_payload		= fib6_rule_nlmsg_payload,
 	.nlgroup		= RTNLGRP_IPV6_RULE,
 	.policy			= fib6_rule_policy,
-	.rules_list		= &fib6_rules,
+	.rules_list		= LIST_HEAD_INIT(fib6_rules_ops.rules_list),
 	.owner			= THIS_MODULE,
 };
 
 void __init fib6_rules_init(void)
 {
-	list_add_tail(&local_rule.common.list, &fib6_rules);
-	list_add_tail(&main_rule.common.list, &fib6_rules);
+	list_add_tail(&local_rule.common.list, &fib6_rules_ops.rules_list);
+	list_add_tail(&main_rule.common.list, &fib6_rules_ops.rules_list);
 
 	fib_rules_register(&fib6_rules_ops);
 }