netfilter: ctnetlink: Support offloaded conntrack entry deletion

commit 9b7c68b3911aef84afa4cbfc31bce20f10570d51 upstream.

Currently, offloaded conntrack entries (flows) can only be deleted
after they are removed from offload, which is either by timeout,
tcp state change or tc ct rule deletion. This can cause issues for
users wishing to manually delete or flush existing entries.

Support deletion of offloaded conntrack entries.

Example usage:
 # Delete all offloaded (and non offloaded) conntrack entries
 # whose source address is 1.2.3.4
 $ conntrack -D -s 1.2.3.4
 # Delete all entries
 $ conntrack -F

Signed-off-by: Paul Blakey <paulb@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Cc: Demi Marie Obenour <demi@invisiblethingslab.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index cb4325b8ebb11c20fd0c7ee9bb5bb1a6d863e38c..857cddd9d82e5b5d0f489230872bbbb044cda4c8 100644 (file)
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1559,9 +1559,6 @@ static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 
 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
 {
-       if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
-               return 0;
-
        return ctnetlink_filter_match(ct, data);
 }
 
@@ -1631,11 +1628,6 @@ static int ctnetlink_del_conntrack(struct sk_buff *skb,
 
        ct = nf_ct_tuplehash_to_ctrack(h);
 
-       if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
-               nf_ct_put(ct);
-               return -EBUSY;
-       }
-
        if (cda[CTA_ID]) {
                __be32 id = nla_get_be32(cda[CTA_ID]);