From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Garver Subject: [PATCH net v3] openvswitch: Fix pop_vlan action for double tagged frames Date: Wed, 20 Dec 2017 15:09:22 -0500 Message-ID: <20171220200922.29415-1-e@erig.me> Cc: ovs-dev@openvswitch.org, Jiri Benc To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:45580 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754819AbdLTUJS (ORCPT ); Wed, 20 Dec 2017 15:09:18 -0500 Sender: netdev-owner@vger.kernel.org List-ID: skb_vlan_pop() expects skb->protocol to be a valid TPID for double tagged frames. So set skb->protocol to the TPID and let skb_vlan_pop() shift the true ethertype into position for us. Fixes: 5108bbaddc37 ("openvswitch: add processing of L3 packets") Signed-off-by: Eric Garver --- net/openvswitch/flow.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c index dbe2379329c5..f039064ce922 100644 --- a/net/openvswitch/flow.c +++ b/net/openvswitch/flow.c @@ -579,6 +579,7 @@ static int key_extract(struct sk_buff *skb, struct sw_flow_key *key) return -EINVAL; skb_reset_network_header(skb); + key->eth.type = skb->protocol; } else { eth = eth_hdr(skb); ether_addr_copy(key->eth.src, eth->h_source); @@ -592,15 +593,23 @@ static int key_extract(struct sk_buff *skb, struct sw_flow_key *key) if (unlikely(parse_vlan(skb, key))) return -ENOMEM; - skb->protocol = parse_ethertype(skb); - if (unlikely(skb->protocol == htons(0))) + key->eth.type = parse_ethertype(skb); + if (unlikely(key->eth.type == htons(0))) return -ENOMEM; + /* Multiple tagged packets need to retain TPID to satisfy + * skb_vlan_pop(), which will later shift the ethertype into + * skb->protocol. + */ + if (key->eth.cvlan.tci & htons(VLAN_TAG_PRESENT)) + skb->protocol = key->eth.cvlan.tpid; + else + skb->protocol = key->eth.type; + skb_reset_network_header(skb); __skb_push(skb, skb->data - skb_mac_header(skb)); } skb_reset_mac_len(skb); - key->eth.type = skb->protocol; /* Network layer. */ if (key->eth.type == htons(ETH_P_IP)) { -- 2.12.0