[PATCH v1 2/4] netfilter: Add a .pre_exit hook in all iptable_foo.c.

[David Wilder]

Using new helpers ipt_unregister_table_pre_exit() and
ipt_unregister_table_exit().

Signed-off-by: David Wilder <dwil...@us.ibm.com>
---
 net/ipv4/netfilter/iptable_filter.c   | 10 +++++++++-
 net/ipv4/netfilter/iptable_mangle.c   | 10 +++++++++-
 net/ipv4/netfilter/iptable_nat.c      | 10 ++++++++--
 net/ipv4/netfilter/iptable_raw.c      | 10 +++++++++-
 net/ipv4/netfilter/iptable_security.c | 11 +++++++++--
 5 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/net/ipv4/netfilter/iptable_filter.c 
b/net/ipv4/netfilter/iptable_filter.c
index 9d54b40..8f7bc1e 100644
--- a/net/ipv4/netfilter/iptable_filter.c
+++ b/net/ipv4/netfilter/iptable_filter.c
@@ -72,16 +72,24 @@ static int __net_init iptable_filter_net_init(struct net 
*net)
        return 0;
 }
 
+static void __net_exit iptable_filter_net_pre_exit(struct net *net)
+{
+       if (net->ipv4.iptable_filter)
+               ipt_unregister_table_pre_exit(net, net->ipv4.iptable_filter,
+                                             filter_ops);
+}
+
 static void __net_exit iptable_filter_net_exit(struct net *net)
 {
        if (!net->ipv4.iptable_filter)
                return;
-       ipt_unregister_table(net, net->ipv4.iptable_filter, filter_ops);
+       ipt_unregister_table_exit(net, net->ipv4.iptable_filter);
        net->ipv4.iptable_filter = NULL;
 }
 
 static struct pernet_operations iptable_filter_net_ops = {
        .init = iptable_filter_net_init,
+       .pre_exit = iptable_filter_net_pre_exit,
        .exit = iptable_filter_net_exit,
 };
 
diff --git a/net/ipv4/netfilter/iptable_mangle.c 
b/net/ipv4/netfilter/iptable_mangle.c
index bb9266e..f703a71 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -100,15 +100,23 @@ static int __net_init iptable_mangle_table_init(struct 
net *net)
        return ret;
 }
 
+static void __net_exit iptable_mangle_net_pre_exit(struct net *net)
+{
+       if (net->ipv4.iptable_mangle)
+               ipt_unregister_table_pre_exit(net, net->ipv4.iptable_mangle,
+                                             mangle_ops);
+}
+
 static void __net_exit iptable_mangle_net_exit(struct net *net)
 {
        if (!net->ipv4.iptable_mangle)
                return;
-       ipt_unregister_table(net, net->ipv4.iptable_mangle, mangle_ops);
+       ipt_unregister_table_exit(net, net->ipv4.iptable_mangle);
        net->ipv4.iptable_mangle = NULL;
 }
 
 static struct pernet_operations iptable_mangle_net_ops = {
+       .pre_exit = iptable_mangle_net_pre_exit,
        .exit = iptable_mangle_net_exit,
 };
 
diff --git a/net/ipv4/netfilter/iptable_nat.c b/net/ipv4/netfilter/iptable_nat.c
index ad33687..b0143b1 100644
--- a/net/ipv4/netfilter/iptable_nat.c
+++ b/net/ipv4/netfilter/iptable_nat.c
@@ -113,16 +113,22 @@ static int __net_init iptable_nat_table_init(struct net 
*net)
        return ret;
 }
 
+static void __net_exit iptable_nat_net_pre_exit(struct net *net)
+{
+       if (net->ipv4.nat_table)
+               ipt_nat_unregister_lookups(net);
+}
+
 static void __net_exit iptable_nat_net_exit(struct net *net)
 {
        if (!net->ipv4.nat_table)
                return;
-       ipt_nat_unregister_lookups(net);
-       ipt_unregister_table(net, net->ipv4.nat_table, NULL);
+       ipt_unregister_table_exit(net, net->ipv4.nat_table);
        net->ipv4.nat_table = NULL;
 }
 
 static struct pernet_operations iptable_nat_net_ops = {
+       .pre_exit = iptable_nat_net_pre_exit,
        .exit   = iptable_nat_net_exit,
 };
 
diff --git a/net/ipv4/netfilter/iptable_raw.c b/net/ipv4/netfilter/iptable_raw.c
index 69697eb..9abfe6b 100644
--- a/net/ipv4/netfilter/iptable_raw.c
+++ b/net/ipv4/netfilter/iptable_raw.c
@@ -67,15 +67,23 @@ static int __net_init iptable_raw_table_init(struct net 
*net)
        return ret;
 }
 
+static void __net_exit iptable_raw_net_pre_exit(struct net *net)
+{
+       if (net->ipv4.iptable_raw)
+               ipt_unregister_table_pre_exit(net, net->ipv4.iptable_raw,
+                                             rawtable_ops);
+}
+
 static void __net_exit iptable_raw_net_exit(struct net *net)
 {
        if (!net->ipv4.iptable_raw)
                return;
-       ipt_unregister_table(net, net->ipv4.iptable_raw, rawtable_ops);
+       ipt_unregister_table_exit(net, net->ipv4.iptable_raw);
        net->ipv4.iptable_raw = NULL;
 }
 
 static struct pernet_operations iptable_raw_net_ops = {
+       .pre_exit = iptable_raw_net_pre_exit,
        .exit = iptable_raw_net_exit,
 };
 
diff --git a/net/ipv4/netfilter/iptable_security.c 
b/net/ipv4/netfilter/iptable_security.c
index ac633c1..415c197 100644
--- a/net/ipv4/netfilter/iptable_security.c
+++ b/net/ipv4/netfilter/iptable_security.c
@@ -62,16 +62,23 @@ static int __net_init iptable_security_table_init(struct 
net *net)
        return ret;
 }
 
+static void __net_exit iptable_security_net_pre_exit(struct net *net)
+{
+       if (net->ipv4.iptable_security)
+               ipt_unregister_table_pre_exit(net, net->ipv4.iptable_security,
+                                             sectbl_ops);
+}
+
 static void __net_exit iptable_security_net_exit(struct net *net)
 {
        if (!net->ipv4.iptable_security)
                return;
-
-       ipt_unregister_table(net, net->ipv4.iptable_security, sectbl_ops);
+       ipt_unregister_table_exit(net, net->ipv4.iptable_security);
        net->ipv4.iptable_security = NULL;
 }
 
 static struct pernet_operations iptable_security_net_ops = {
+       .pre_exit = iptable_security_net_pre_exit,
        .exit = iptable_security_net_exit,
 };
 
-- 
1.8.3.1