[NETFILTER]: nf_conntrack: automatic helper assignment for expectations

Some helpers (namely H.323) manually assign further helpers to expected
connections. This is not possible with nf_conntrack anymore since we
need to know whether a helper is used at allocation time.

Handle the helper assignment centrally, which allows to perform the
correct allocation and as a nice side effect eliminates the need
for the H.323 helper to fiddle with nf_conntrack_lock.

Mid term the allocation scheme really needs to be redesigned since
we do both the helper and expectation lookup _twice_ for every new
connection.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/net/netfilter/nf_conntrack_expect.h b/include/net/netfilter/nf_conntrack_expect.h
index 2d335f024c85..5d853e826d1d 100644
--- a/include/net/netfilter/nf_conntrack_expect.h
+++ b/include/net/netfilter/nf_conntrack_expect.h
@@ -22,6 +22,9 @@ struct nf_conntrack_expect
         void (*expectfn)(struct nf_conn *new,
                          struct nf_conntrack_expect *this);
 
+        /* Helper to assign to new connection */
+        struct nf_conntrack_helper *helper;
+
         /* The conntrack of the master connection */
         struct nf_conn *master;