netdev - [PATCH net-next 3/5] openvswitch: move key and ovs_cb update out of handle

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Message-Id: <cc0b888a0284dea4a20dd50a5c5614c67ccff4df.1675548023.git.lucien.xin@gmail.com>
Date:   Sat,  4 Feb 2023 17:02:49 -0500
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, dev@...nvswitch.org
Cc:     davem@...emloft.net, kuba@...nel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Pravin B Shelar <pshelar@....org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Ilya Maximets <i.maximets@....org>,
        Aaron Conole <aconole@...hat.com>
Subject: [PATCH net-next 3/5] openvswitch: move key and ovs_cb update out of handle_fragments

This patch has no functional changes and just moves key and ovs_cb update
out of handle_fragments, and skb_clear_hash() and skb->ignore_df change
into handle_fragments(), to make it easier to move the duplicate code
from handle_fragments() into nf_conntrack_ovs later.

Note that it changes to pass info->family to handle_fragments() instead
of key for the packet type check, as info->family is set according to
key->eth.type in ovs_ct_copy_action() when creating the action.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/openvswitch/conntrack.c | 37 +++++++++++++++++++++++++------------
 1 file changed, 25 insertions(+), 12 deletions(-)

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 47a58657b1e4..962e2f70e597 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -437,13 +437,12 @@ static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
  * value if 'skb' is freed.
  */
-static int handle_fragments(struct net *net, struct sw_flow_key *key,
-			    u16 zone, struct sk_buff *skb)
+static int handle_fragments(struct net *net, struct sk_buff *skb,
+			    u16 zone, u8 family, u8 *proto, u16 *mru)
 {
-	struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
 	int err;
 
-	if (key->eth.type == htons(ETH_P_IP)) {
+	if (family == NFPROTO_IPV4) {
 		enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
 
 		memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
@@ -451,9 +450,9 @@ static int handle_fragments(struct net *net, struct sw_flow_key *key,
 		if (err)
 			return err;
 
-		ovs_cb.mru = IPCB(skb)->frag_max_size;
+		*mru = IPCB(skb)->frag_max_size;
 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
-	} else if (key->eth.type == htons(ETH_P_IPV6)) {
+	} else if (family == NFPROTO_IPV6) {
 		enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
 
 		memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
@@ -464,22 +463,35 @@ static int handle_fragments(struct net *net, struct sw_flow_key *key,
 			return err;
 		}
 
-		key->ip.proto = ipv6_hdr(skb)->nexthdr;
-		ovs_cb.mru = IP6CB(skb)->frag_max_size;
+		*proto = ipv6_hdr(skb)->nexthdr;
+		*mru = IP6CB(skb)->frag_max_size;
 #endif
 	} else {
 		kfree_skb(skb);
 		return -EPFNOSUPPORT;
 	}
 
+	skb_clear_hash(skb);
+	skb->ignore_df = 1;
+
+	return 0;
+}
+
+static int ovs_ct_handle_fragments(struct net *net, struct sw_flow_key *key,
+				   u16 zone, int family, struct sk_buff *skb)
+{
+	struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
+	int err;
+
+	err = handle_fragments(net, skb, zone, family, &key->ip.proto, &ovs_cb.mru);
+	if (err)
+		return err;
+
 	/* The key extracted from the fragment that completed this datagram
 	 * likely didn't have an L4 header, so regenerate it.
 	 */
 	ovs_flow_key_update_l3l4(skb, key);
-
 	key->ip.frag = OVS_FRAG_TYPE_NONE;
-	skb_clear_hash(skb);
-	skb->ignore_df = 1;
 	*OVS_CB(skb) = ovs_cb;
 
 	return 0;
@@ -1111,7 +1123,8 @@ int ovs_ct_execute(struct net *net, struct sk_buff *skb,
 	}
 
 	if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
-		err = handle_fragments(net, key, info->zone.id, skb);
+		err = ovs_ct_handle_fragments(net, key, info->zone.id,
+					      info->family, skb);
 		if (err)
 			return err;
 	}
-- 
2.31.1