netdev - [PATCH net-next] openvswitch: Derive IP protocol number for IPv6 later frags

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Date:   Fri, 10 Aug 2018 10:19:41 -0700
From:   Yi-Hung Wei <yihung.wei@...il.com>
To:     netdev@...r.kernel.org, u9012063@...il.com
Cc:     Yi-Hung Wei <yihung.wei@...il.com>
Subject: [PATCH net-next] openvswitch: Derive IP protocol number for IPv6 later frags

Currently, OVS only parses the IP protocol number for the first
IPv6 fragment, but sets the IP protocol number for the later fragments
to be NEXTHDF_FRAGMENT.  This patch tries to derive the IP protocol
number for the IPV6 later frags so that we can match that.

Signed-off-by: Yi-Hung Wei <yihung.wei@...il.com>
---
 net/openvswitch/flow.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 56b8e7167790..3d654c4f71be 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -297,7 +297,13 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
 
 	nh_len = payload_ofs - nh_ofs;
 	skb_set_transport_header(skb, nh_ofs + nh_len);
-	key->ip.proto = nexthdr;
+	if (key->ip.frag == OVS_FRAG_TYPE_LATER) {
+		unsigned int offset = 0;
+
+		key->ip.proto = ipv6_find_hdr(skb, &offset, -1, NULL, NULL);
+	} else {
+		key->ip.proto = nexthdr;
+	}
 	return nh_len;
 }
 
-- 
2.7.4