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Message-Id: <1464584665-8512-1-git-send-email-simon.horman@netronome.com> Date: Mon, 30 May 2016 14:04:25 +0900 From: Simon Horman <simon.horman@...ronome.com> To: pravin shelar <pshelar@....org> Cc: netdev@...r.kernel.org, Simon Horman <simon.horman@...ronome.com>, Pravin Shelar <pshelar@...ira.com> Subject: [PATCH net v2] openvswitch: update checksum in {push,pop}_mpls In the case of CHECKSUM_COMPLETE the skb checksum should be updated in {push,pop}_mpls() as they the type in the ethernet header. As suggested by Pravin Shelar. Cc: Pravin Shelar <pshelar@...ira.com> Fixes: 25cd9ba0abc0 ("openvswitch: Add basic MPLS support to kernel") Signed-off-by: Simon Horman <simon.horman@...ronome.com> --- v2 * Use helper to reduce duplicated code. --- net/openvswitch/actions.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c index 879185fe183f..9a3eb7a0ebf4 100644 --- a/net/openvswitch/actions.c +++ b/net/openvswitch/actions.c @@ -137,11 +137,23 @@ static bool is_flow_key_valid(const struct sw_flow_key *key) return !!key->eth.type; } +static void update_ethertype(struct sk_buff *skb, struct ethhdr *hdr, + __be16 ethertype) +{ + if (skb->ip_summed == CHECKSUM_COMPLETE) { + __be16 diff[] = { ~(hdr->h_proto), ethertype }; + + skb->csum = ~csum_partial((char *)diff, sizeof(diff), + ~skb->csum); + } + + hdr->h_proto = ethertype; +} + static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, const struct ovs_action_push_mpls *mpls) { __be32 *new_mpls_lse; - struct ethhdr *hdr; /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */ if (skb->encapsulation) @@ -160,9 +172,7 @@ static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, skb_postpush_rcsum(skb, new_mpls_lse, MPLS_HLEN); - hdr = eth_hdr(skb); - hdr->h_proto = mpls->mpls_ethertype; - + update_ethertype(skb, eth_hdr(skb), mpls->mpls_ethertype); if (!skb->inner_protocol) skb_set_inner_protocol(skb, skb->protocol); skb->protocol = mpls->mpls_ethertype; @@ -193,7 +203,7 @@ static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key, * field correctly in the presence of VLAN tags. */ hdr = (struct ethhdr *)(skb_mpls_header(skb) - ETH_HLEN); - hdr->h_proto = ethertype; + update_ethertype(skb, hdr, ethertype); if (eth_p_mpls(skb->protocol)) skb->protocol = ethertype; -- 2.1.4
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