From 193e30967897f3a8b6f9f137ac30571d832c2c5c Mon Sep 17 00:00:00 2001 From: Jarno Rajahalme Date: Thu, 9 Feb 2017 11:21:54 -0800 Subject: [PATCH] openvswitch: Do not trigger events for unconfirmed connections. Receiving change events before the 'new' event for the connection has been received can be confusing. Avoid triggering change events for setting conntrack mark or labels before the conntrack entry has been confirmed. Fixes: 182e3042e15d ("openvswitch: Allow matching on conntrack mark") Fixes: c2ac66735870 ("openvswitch: Allow matching on conntrack label") Signed-off-by: Jarno Rajahalme Acked-by: Joe Stringer Acked-by: Pravin B Shelar Signed-off-by: David S. Miller --- net/openvswitch/conntrack.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c index 4df9a5449c95..a6ff374d57d3 100644 --- a/net/openvswitch/conntrack.c +++ b/net/openvswitch/conntrack.c @@ -245,7 +245,8 @@ static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key, new_mark = ct_mark | (ct->mark & ~(mask)); if (ct->mark != new_mark) { ct->mark = new_mark; - nf_conntrack_event_cache(IPCT_MARK, ct); + if (nf_ct_is_confirmed(ct)) + nf_conntrack_event_cache(IPCT_MARK, ct); key->ct.mark = new_mark; } @@ -262,7 +263,6 @@ static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key, enum ip_conntrack_info ctinfo; struct nf_conn_labels *cl; struct nf_conn *ct; - int err; /* The connection could be invalid, in which case set_label is no-op.*/ ct = nf_ct_get(skb, &ctinfo); @@ -277,10 +277,26 @@ static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key, if (!cl || sizeof(cl->bits) < OVS_CT_LABELS_LEN) return -ENOSPC; - err = nf_connlabels_replace(ct, (u32 *)labels, (u32 *)mask, - OVS_CT_LABELS_LEN / sizeof(u32)); - if (err) - return err; + if (nf_ct_is_confirmed(ct)) { + /* Triggers a change event, which makes sense only for + * confirmed connections. + */ + int err = nf_connlabels_replace(ct, (u32 *)labels, (u32 *)mask, + OVS_CT_LABELS_LEN / sizeof(u32)); + if (err) + return err; + } else { + u32 *dst = (u32 *)cl->bits; + const u32 *msk = (const u32 *)mask->ct_labels; + const u32 *lbl = (const u32 *)labels->ct_labels; + int i; + + /* No-one else has access to the non-confirmed entry, copy + * labels over, keeping any bits we are not explicitly setting. + */ + for (i = 0; i < OVS_CT_LABELS_LEN / sizeof(u32); i++) + dst[i] = (dst[i] & ~msk[i]) | (lbl[i] & msk[i]); + } ovs_ct_get_labels(ct, &key->ct.labels); return 0; -- 2.20.1