netdev - [PATCH net 3/3] net: openvswitch: Fix matching zone id for invalid conns arriving from tc

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Date:   Wed, 8 Dec 2021 19:02:40 +0200
From:   Paul Blakey <paulb@...dia.com>
To:     Paul Blakey <paulb@...dia.com>, <dev@...nvswitch.org>,
        <netdev@...r.kernel.org>, Saeed Mahameed <saeedm@...dia.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        "Pravin B Shelar" <pshelar@....org>, <davem@...emloft.net>,
        Jiri Pirko <jiri@...dia.com>
CC:     Oz Shlomo <ozsh@...dia.com>, Vlad Buslov <vladbu@...dia.com>,
        Roi Dayan <roid@...dia.com>
Subject: [PATCH net 3/3] net: openvswitch: Fix matching zone id for invalid conns arriving from tc

Zone id is not restored if we passed ct and ct rejected the connection,
as there is no ct info on the skb.

Save the zone from tc skb cb to tc skb extension and pass it on to
ovs, use that info to restore the zone id for invalid connections.

Fixes: d29334c15d33 ("net/sched: act_api: fix miss set post_ct for ovs after do conntrack in act_ct")
Signed-off-by: Paul Blakey <paulb@...dia.com>
---
 include/linux/skbuff.h | 1 +
 net/openvswitch/flow.c | 8 +++++++-
 net/sched/cls_api.c    | 1 +
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 155eb2ec54d8..28ad0c6bd0d5 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -286,6 +286,7 @@ struct nf_bridge_info {
 struct tc_skb_ext {
 	__u32 chain;
 	__u16 mru;
+	__u16 zone;
 	bool post_ct;
 };
 #endif
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 9713035b89e3..6d262d9aa10e 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -34,6 +34,7 @@
 #include <net/mpls.h>
 #include <net/ndisc.h>
 #include <net/nsh.h>
+#include <net/netfilter/nf_conntrack_zones.h>
 
 #include "conntrack.h"
 #include "datapath.h"
@@ -860,6 +861,7 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
 #endif
 	bool post_ct = false;
 	int res, err;
+	u16 zone = 0;
 
 	/* Extract metadata from packet. */
 	if (tun_info) {
@@ -898,6 +900,7 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
 		key->recirc_id = tc_ext ? tc_ext->chain : 0;
 		OVS_CB(skb)->mru = tc_ext ? tc_ext->mru : 0;
 		post_ct = tc_ext ? tc_ext->post_ct : false;
+		zone = post_ct ? tc_ext->zone : 0;
 	} else {
 		key->recirc_id = 0;
 	}
@@ -906,8 +909,11 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
 #endif
 
 	err = key_extract(skb, key);
-	if (!err)
+	if (!err) {
 		ovs_ct_fill_key(skb, key, post_ct);   /* Must be after key_extract(). */
+		if (post_ct && !skb_get_nfct(skb))
+			key->ct_zone = zone;
+	}
 	return err;
 }
 
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index a5050999d607..bede2bd47065 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -1625,6 +1625,7 @@ int tcf_classify(struct sk_buff *skb,
 		ext->chain = last_executed_chain;
 		ext->mru = cb->mru;
 		ext->post_ct = cb->post_ct;
+		ext->zone = cb->zone;
 	}
 
 	return ret;
-- 
2.30.1