From cf2ce93a7afa96659c5980ae114c5f2ee3510a8d Mon Sep 17 00:00:00 2001 From: Paul Blakey Date: Thu, 6 Jan 2022 17:38:04 +0200 Subject: [PATCH] net: openvswitch: Fix ct_state nat flags for conns arriving from tc [ Upstream commit 6f022c2ddbcefaee79502ce5386dfe351d457070 ] Netfilter conntrack maintains NAT flags per connection indicating whether NAT was configured for the connection. Openvswitch maintains NAT flags on the per packet flow key ct_state field, indicating whether NAT was actually executed on the packet. When a packet misses from tc to ovs the conntrack NAT flags are set. However, NAT was not necessarily executed on the packet because the connection's state might still be in NEW state. As such, openvswitch wrongly assumes that NAT was executed and sets an incorrect flow key NAT flags. Fix this, by flagging to openvswitch which NAT was actually done in act_ct via tc_skb_ext and tc_skb_cb to the openvswitch module, so the packet flow key NAT flags will be correctly set. Fixes: b57dc7c13ea9 ("net/sched: Introduce action ct") Signed-off-by: Paul Blakey Acked-by: Jamal Hadi Salim Link: https://lore.kernel.org/r/20220106153804.26451-1-paulb@nvidia.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- include/linux/skbuff.h | 4 +++- include/net/pkt_sched.h | 4 +++- net/openvswitch/flow.c | 16 +++++++++++++--- net/sched/act_ct.c | 6 ++++++ net/sched/cls_api.c | 2 ++ 5 files changed, 27 insertions(+), 5 deletions(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index f92839b..532f5d4 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -287,7 +287,9 @@ struct tc_skb_ext { __u32 chain; __u16 mru; __u16 zone; - bool post_ct; + u8 post_ct:1; + u8 post_ct_snat:1; + u8 post_ct_dnat:1; }; #endif diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h index 9e71691..9e7b21c 100644 --- a/include/net/pkt_sched.h +++ b/include/net/pkt_sched.h @@ -197,7 +197,9 @@ struct tc_skb_cb { struct qdisc_skb_cb qdisc_cb; u16 mru; - bool post_ct; + u8 post_ct:1; + u8 post_ct_snat:1; + u8 post_ct_dnat:1; u16 zone; /* Only valid if post_ct = true */ }; diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c index 6d262d9..02096f2 100644 --- a/net/openvswitch/flow.c +++ b/net/openvswitch/flow.c @@ -859,7 +859,7 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info, #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT) struct tc_skb_ext *tc_ext; #endif - bool post_ct = false; + bool post_ct = false, post_ct_snat = false, post_ct_dnat = false; int res, err; u16 zone = 0; @@ -900,6 +900,8 @@ 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; + post_ct_snat = post_ct ? tc_ext->post_ct_snat : false; + post_ct_dnat = post_ct ? tc_ext->post_ct_dnat : false; zone = post_ct ? tc_ext->zone : 0; } else { key->recirc_id = 0; @@ -911,8 +913,16 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info, err = key_extract(skb, key); 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; + if (post_ct) { + if (!skb_get_nfct(skb)) { + key->ct_zone = zone; + } else { + if (!post_ct_dnat) + key->ct_state &= ~OVS_CS_F_DST_NAT; + if (!post_ct_snat) + key->ct_state &= ~OVS_CS_F_SRC_NAT; + } + } } return err; } diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c index ab35914..2a17eb7 100644 --- a/net/sched/act_ct.c +++ b/net/sched/act_ct.c @@ -839,6 +839,12 @@ static int ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct, } err = nf_nat_packet(ct, ctinfo, hooknum, skb); + if (err == NF_ACCEPT) { + if (maniptype == NF_NAT_MANIP_SRC) + tc_skb_cb(skb)->post_ct_snat = 1; + if (maniptype == NF_NAT_MANIP_DST) + tc_skb_cb(skb)->post_ct_dnat = 1; + } out: return err; } diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 35c74bd..cc9409a 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -1625,6 +1625,8 @@ int tcf_classify(struct sk_buff *skb, ext->chain = last_executed_chain; ext->mru = cb->mru; ext->post_ct = cb->post_ct; + ext->post_ct_snat = cb->post_ct_snat; + ext->post_ct_dnat = cb->post_ct_dnat; ext->zone = cb->zone; } -- 2.7.4