From 0661cca9c216322e77dca7f47df107c02ce4e70c Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Wed, 14 Mar 2007 16:38:48 -0700 Subject: [PATCH] [NETFILTER]: nf_conntrack: simplify protocol locking Now that we don't use nf_conntrack_lock anymore but a single mutex for all protocol handling, no need to release and grab it again for sysctl registration. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/netfilter/nf_conntrack_proto.c | 49 ++++++++++-------------------- 1 file changed, 16 insertions(+), 33 deletions(-) diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c index 0ca2f0ba7c76..509725412d3b 100644 --- a/net/netfilter/nf_conntrack_proto.c +++ b/net/netfilter/nf_conntrack_proto.c @@ -164,13 +164,11 @@ static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto) int err = 0; #ifdef CONFIG_SYSCTL - mutex_lock(&nf_ct_proto_mutex); if (l3proto->ctl_table != NULL) { err = nf_ct_register_sysctl(&l3proto->ctl_table_header, l3proto->ctl_table_path, l3proto->ctl_table, NULL); } - mutex_unlock(&nf_ct_proto_mutex); #endif return err; } @@ -178,11 +176,9 @@ static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto) static void nf_ct_l3proto_unregister_sysctl(struct nf_conntrack_l3proto *l3proto) { #ifdef CONFIG_SYSCTL - mutex_lock(&nf_ct_proto_mutex); if (l3proto->ctl_table_header != NULL) nf_ct_unregister_sysctl(&l3proto->ctl_table_header, l3proto->ctl_table, NULL); - mutex_unlock(&nf_ct_proto_mutex); #endif } @@ -190,27 +186,23 @@ int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto) { int ret = 0; - if (proto->l3proto >= AF_MAX) { - ret = -EBUSY; - goto out; - } + if (proto->l3proto >= AF_MAX) + return -EBUSY; mutex_lock(&nf_ct_proto_mutex); if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_l3proto_generic) { ret = -EBUSY; goto out_unlock; } - rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); - mutex_unlock(&nf_ct_proto_mutex); ret = nf_ct_l3proto_register_sysctl(proto); if (ret < 0) - nf_conntrack_l3proto_unregister(proto); - return ret; + goto out_unlock; + + rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); out_unlock: mutex_unlock(&nf_ct_proto_mutex); -out: return ret; } EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register); @@ -223,10 +215,10 @@ void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto) BUG_ON(nf_ct_l3protos[proto->l3proto] != proto); rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], &nf_conntrack_l3proto_generic); - mutex_unlock(&nf_ct_proto_mutex); - synchronize_rcu(); - nf_ct_l3proto_unregister_sysctl(proto); + mutex_unlock(&nf_ct_proto_mutex); + + synchronize_rcu(); /* Remove all contrack entries for this protocol */ nf_ct_iterate_cleanup(kill_l3proto, proto); @@ -238,7 +230,6 @@ static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto) int err = 0; #ifdef CONFIG_SYSCTL - mutex_lock(&nf_ct_proto_mutex); if (l4proto->ctl_table != NULL) { err = nf_ct_register_sysctl(l4proto->ctl_table_header, nf_net_netfilter_sysctl_path, @@ -260,7 +251,6 @@ static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto) } #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ out: - mutex_unlock(&nf_ct_proto_mutex); #endif /* CONFIG_SYSCTL */ return err; } @@ -268,7 +258,6 @@ static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto) static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto) { #ifdef CONFIG_SYSCTL - mutex_lock(&nf_ct_proto_mutex); if (l4proto->ctl_table_header != NULL && *l4proto->ctl_table_header != NULL) nf_ct_unregister_sysctl(l4proto->ctl_table_header, @@ -279,7 +268,6 @@ static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto nf_ct_unregister_sysctl(&l4proto->ctl_compat_table_header, l4proto->ctl_compat_table, NULL); #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ - mutex_unlock(&nf_ct_proto_mutex); #endif /* CONFIG_SYSCTL */ } @@ -289,10 +277,8 @@ int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto) { int ret = 0; - if (l4proto->l3proto >= PF_MAX) { - ret = -EBUSY; - goto out; - } + if (l4proto->l3proto >= PF_MAX) + return -EBUSY; mutex_lock(&nf_ct_proto_mutex); retry: @@ -331,17 +317,14 @@ int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto) goto retry; } - rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], l4proto); - mutex_unlock(&nf_ct_proto_mutex); - ret = nf_ct_l4proto_register_sysctl(l4proto); if (ret < 0) - nf_conntrack_l4proto_unregister(l4proto); - return ret; + goto out_unlock; + + rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], l4proto); out_unlock: mutex_unlock(&nf_ct_proto_mutex); -out: return ret; } EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register); @@ -354,10 +337,10 @@ void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto) BUG_ON(nf_ct_protos[l4proto->l3proto][l4proto->l4proto] != l4proto); rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], &nf_conntrack_l4proto_generic); - mutex_unlock(&nf_ct_proto_mutex); - synchronize_rcu(); - nf_ct_l4proto_unregister_sysctl(l4proto); + mutex_unlock(&nf_ct_proto_mutex); + + synchronize_rcu(); /* Remove all contrack entries for this protocol */ nf_ct_iterate_cleanup(kill_l4proto, l4proto);