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openvswitch: Fix IPv6 later frags parsing

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The previous commit fa642f0883
("openvswitch: Derive IP protocol number for IPv6 later frags")
introduces IP protocol number parsing for IPv6 later frags that can mess
up the network header length calculation logic, i.e. nh_len < 0.
However, the network header length calculation is mainly for deriving
the transport layer header in the key extraction process which the later
fragment does not apply.

Therefore, this commit skips the network header length calculation to
fix the issue.

Reported-by: Chris Mi <chrism@mellanox.com>
Reported-by: Greg Rose <gvrose8192@gmail.com>
Fixes: fa642f0883 ("openvswitch: Derive IP protocol number for IPv6 later frags")
Signed-off-by: Yi-Hung Wei <yihung.wei@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yi-Hung Wei 2019-01-03 09:51:57 -08:00 committed by David S. Miller
parent ba3e1847d6
commit 41e4e2cd75
1 changed files with 5 additions and 3 deletions
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8
net/openvswitch/flow.c
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@ -276,10 +276,12 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
if (flags & IP6_FH_F_FRAG) {
if (frag_off)
if (frag_off) {
key->ip.frag = OVS_FRAG_TYPE_LATER;
else
key->ip.frag = OVS_FRAG_TYPE_FIRST;
key->ip.proto = nexthdr;
return 0;
}
key->ip.frag = OVS_FRAG_TYPE_FIRST;
} else {
key->ip.frag = OVS_FRAG_TYPE_NONE;
}