From b66b6d9f6dbe0655a570fb2a2482cceac5f1a9bc Mon Sep 17 00:00:00 2001 From: Joe Stringer Date: Fri, 14 Nov 2014 07:47:40 +0000 Subject: [PATCH] fm10k: Check tunnel header length in encap offload fm10k supports up to 184 bytes of inner+outer headers. Add an initial check to fail encap offload if these are too large. Signed-off-by: Joe Stringer Tested-by: Krishneil Singh Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/fm10k/fm10k_main.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c b/drivers/net/ethernet/intel/fm10k/fm10k_main.c index c7a19a5..84ab9ee 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c @@ -727,6 +727,12 @@ static __be16 fm10k_tx_encap_offload(struct sk_buff *skb) struct ethhdr *eth_hdr; u8 l4_hdr = 0; +/* fm10k supports 184 octets of outer+inner headers. Minus 20 for inner L4. */ +#define FM10K_MAX_ENCAP_TRANSPORT_OFFSET 164 + if (skb_inner_transport_header(skb) - skb_mac_header(skb) > + FM10K_MAX_ENCAP_TRANSPORT_OFFSET) + return 0; + switch (vlan_get_protocol(skb)) { case htons(ETH_P_IP): l4_hdr = ip_hdr(skb)->protocol; -- 2.7.4