From d2bef7f33d11667567665613be94b56ce9071e74 Mon Sep 17 00:00:00 2001 From: Yi-Hung Wei Date: Thu, 3 Jan 2019 09:51:57 -0800 Subject: openvswitch: Fix IPv6 later frags parsing [ Upstream commit 41e4e2cd75346667b0c531c07dab05cce5b06d15 ] The previous commit fa642f08839b ("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 Reported-by: Greg Rose Fixes: fa642f08839b ("openvswitch: Derive IP protocol number for IPv6 later frags") Signed-off-by: Yi-Hung Wei Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/openvswitch/flow.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'net') diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c index 35966da84769..f920a347ee1c 100644 --- a/net/openvswitch/flow.c +++ b/net/openvswitch/flow.c @@ -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; } -- cgit v1.2.3