From 28b6e0c1ace45779c60e7cefe6d469b7ecb520b8 Mon Sep 17 00:00:00 2001 From: Jarno Rajahalme Date: Thu, 10 Mar 2016 10:54:22 -0800 Subject: [PATCH] openvswitch: Delay conntrack helper call for new connections. There is no need to help connections that are not confirmed, so we can delay helping new connections to the time when they are confirmed. This change is needed for NAT support, and having this as a separate patch will make the following NAT patch a bit easier to review. Signed-off-by: Jarno Rajahalme Acked-by: Joe Stringer Signed-off-by: Pablo Neira Ayuso --- net/openvswitch/conntrack.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c index 85256b3..f718b72 100644 --- a/net/openvswitch/conntrack.c +++ b/net/openvswitch/conntrack.c @@ -483,7 +483,11 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, * actually run the packet through conntrack twice unless it's for a * different zone. */ - if (!skb_nfct_cached(net, key, info, skb)) { + bool cached = skb_nfct_cached(net, key, info, skb); + enum ip_conntrack_info ctinfo; + struct nf_conn *ct; + + if (!cached) { struct nf_conn *tmpl = info->ct; int err; @@ -506,11 +510,18 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, return -ENOENT; ovs_ct_update_key(skb, info, key, true); + } - if (ovs_ct_helper(skb, info->family) != NF_ACCEPT) { - WARN_ONCE(1, "helper rejected packet"); - return -EINVAL; - } + /* Call the helper only if: + * - nf_conntrack_in() was executed above ("!cached") for a confirmed + * connection, or + * - When committing an unconfirmed connection. + */ + ct = nf_ct_get(skb, &ctinfo); + if (ct && (nf_ct_is_confirmed(ct) ? !cached : info->commit) && + ovs_ct_helper(skb, info->family) != NF_ACCEPT) { + WARN_ONCE(1, "helper rejected packet"); + return -EINVAL; } return 0; -- 2.7.4