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ip_gre: check packet length and mtu correctly in erspan_xmit

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As a ARPHRD_ETHER device, skb->len in erspan_xmit is the length
of the whole ether packet. So before checking if a packet size
exceeds the mtu, skb->len should subtract dev->hard_header_len.

Otherwise, all packets with max size according to mtu would be
trimmed to be truncated packet.

Fixes: 84e54fe0a5 ("gre: introduce native tunnel support for ERSPAN")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-10-01 22:00:54 +08:00 committed by David S. Miller
parent 935a9749a3
commit 5513d08d29
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/ip_gre.c
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@ -731,7 +731,7 @@ static netdev_tx_t erspan_xmit(struct sk_buff *skb,
if (skb_cow_head(skb, dev->needed_headroom))
goto free_skb;
if (skb->len > dev->mtu) {
if (skb->len - dev->hard_header_len > dev->mtu) {
pskb_trim(skb, dev->mtu);
truncate = true;
}