[PATCH 0/3 net-2.6.25] call FIB rule->action in the correct namespace

[PATCH 0/3 net-2.6.25] call FIB rule->action in the correct namespace

[Denis V. Lunev]

FIB rule->action should operate in the same namespace as fib_lookup.
This is definitely missed right now.

There are two ways to implement this: pass struct net into another rules
API call (2 levels) or place netns into rule struct directly. The second
approach seems better as the code will grow less.

Additionally, the patchset cleanups struct net from
fib_rules_register/unregister to have network namespace context at the
time of default rules creation.

Signed-off-by: Denis V. Lunev <den@openvz.org>

[PATCH 1/3 net-2.6.25] Add netns to fib_rules_ops.

[Denis V. Lunev]

The backward link from FIB rules operations to the network namespace will
allow to simplify the API a bit.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
---
 include/net/fib_rules.h |    1 +
 net/decnet/dn_rules.c   |    1 +
 net/ipv4/fib_rules.c    |    2 ++
 net/ipv6/fib6_rules.c   |    1 +
 4 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
index 4f47250..6910e01 100644
--- a/include/net/fib_rules.h
+++ b/include/net/fib_rules.h
@@ -67,6 +67,7 @@ struct fib_rules_ops
 	const struct nla_policy	*policy;
 	struct list_head	rules_list;
 	struct module		*owner;
+	struct net		*fro_net;
 };
 
 #define FRA_GENERIC_POLICY \
diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
index c1fae23..964e658 100644
--- a/net/decnet/dn_rules.c
+++ b/net/decnet/dn_rules.c
@@ -249,6 +249,7 @@ static struct fib_rules_ops dn_fib_rules_ops = {
 	.policy		= dn_fib_rule_policy,
 	.rules_list	= LIST_HEAD_INIT(dn_fib_rules_ops.rules_list),
 	.owner		= THIS_MODULE,
+	.fro_net	= &init_net,
 };
 
 void __init dn_fib_rules_init(void)
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 72232ab..8d0ebe7 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -315,6 +315,8 @@ int __net_init fib4_rules_init(struct net *net)
 	if (ops == NULL)
 		return -ENOMEM;
 	INIT_LIST_HEAD(&ops->rules_list);
+	ops->fro_net = net;
+
 	fib_rules_register(net, ops);
 
 	err = fib_default_rules_init(ops);
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index 76437a1..ead5ab2 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -249,6 +249,7 @@ static struct fib_rules_ops fib6_rules_ops = {
 	.policy			= fib6_rule_policy,
 	.rules_list		= LIST_HEAD_INIT(fib6_rules_ops.rules_list),
 	.owner			= THIS_MODULE,
+	.fro_net		= &init_net,
 };
 
 static int __init fib6_default_rules_init(void)
-- 
1.5.3.rc5

[PATCH 2/3 net-2.6.25] [NETNS] FIB rules API cleanup.

[Denis V. Lunev]

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>
---
 include/net/fib_rules.h |    4 ++--
 net/core/fib_rules.c    |   20 +++++++++++++-------
 net/decnet/dn_rules.c   |    4 ++--
 net/ipv4/fib_rules.c    |    6 +++---
 net/ipv6/fib6_rules.c   |    4 ++--
 5 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
index 6910e01..7f9f4ae 100644
--- a/include/net/fib_rules.h
+++ b/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 *,
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 541728a..3cd4f13 100644
--- a/net/core/fib_rules.c
+++ b/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)
diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
index 964e658..5b7539b 100644
--- a/net/decnet/dn_rules.c
+++ b/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);
 }
 
 
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 8d0ebe7..3b7affd 100644
--- a/net/ipv4/fib_rules.c
+++ b/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);
 }
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index ead5ab2..695c0ca 100644
--- a/net/ipv6/fib6_rules.c
+++ b/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);
 }
-- 
1.5.3.rc5

[PATCH 3/3 net-2.6.25] Process FIB rule action in the context of the namespace.

[Denis V. Lunev]

Save namespace context on the fib rule at the rule creation time and call
routing lookup in the correct namespace.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
---
 include/net/fib_rules.h |    1 +
 net/core/fib_rules.c    |    2 ++
 net/ipv4/fib_rules.c    |    2 +-
 3 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
index 7f9f4ae..34349f9 100644
--- a/include/net/fib_rules.h
+++ b/include/net/fib_rules.h
@@ -22,6 +22,7 @@ struct fib_rule
 	u32			target;
 	struct fib_rule *	ctarget;
 	struct rcu_head		rcu;
+	struct net *		fr_net;
 };
 
 struct fib_lookup_arg
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 3cd4f13..42ccaf5 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -29,6 +29,7 @@ int fib_default_rule_add(struct fib_rules_ops *ops,
 	r->pref = pref;
 	r->table = table;
 	r->flags = flags;
+	r->fr_net = ops->fro_net;
 
 	/* The lock is not required here, the list in unreacheable
 	 * at the moment this function is called */
@@ -242,6 +243,7 @@ static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 		err = -ENOMEM;
 		goto errout;
 	}
+	rule->fr_net = net;
 
 	if (tb[FRA_PRIORITY])
 		rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 3b7affd..d2001f1 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -91,7 +91,7 @@ static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
 		goto errout;
 	}
 
-	if ((tbl = fib_get_table(&init_net, rule->table)) == NULL)
+	if ((tbl = fib_get_table(rule->fr_net, rule->table)) == NULL)
 		goto errout;
 
 	err = tbl->tb_lookup(tbl, flp, (struct fib_result *) arg->result);
-- 
1.5.3.rc5

Re: [PATCH 0/3 net-2.6.25] call FIB rule->action in the correct namespace

[Daniel Lezcano]

Denis V. Lunev wrote:
> FIB rule->action should operate in the same namespace as fib_lookup.
> This is definitely missed right now.
> 
> There are two ways to implement this: pass struct net into another rules
> API call (2 levels) or place netns into rule struct directly. The second
> approach seems better as the code will grow less.
> 
> Additionally, the patchset cleanups struct net from
> fib_rules_register/unregister to have network namespace context at the
> time of default rules creation.
> 
> Signed-off-by: Denis V. Lunev <den@openvz.org>

Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>

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Re: [PATCH 0/3 net-2.6.25] call FIB rule->action in the correct namespace

[David Miller]

From: "Denis V. Lunev" <den@openvz.org>
Date: Thu, 17 Jan 2008 13:08:51 +0300

> FIB rule->action should operate in the same namespace as fib_lookup.
> This is definitely missed right now.
> 
> There are two ways to implement this: pass struct net into another rules
> API call (2 levels) or place netns into rule struct directly. The second
> approach seems better as the code will grow less.
> 
> Additionally, the patchset cleanups struct net from
> fib_rules_register/unregister to have network namespace context at the
> time of default rules creation.
> 
> Signed-off-by: Denis V. Lunev <den@openvz.org>

All 3 patches applied, thanks.