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| author | William Tu <u9012063@gmail.com> | 2017-10-05 22:07:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-25 16:26:27 +0300 |
| commit | 2f48fc1742a2da6196482695ec3bcd2438d24a13 (patch) | |
| tree | 09b807d995b72643608426c29ec03b0ac2f462c4 /net/ipv4/ip_gre.c | |
| parent | 6d7bdad132d59c429dc340f8d10a4977e58813b0 (diff) | |
| download | linux-2f48fc1742a2da6196482695ec3bcd2438d24a13.tar.xz | |
ip_gre: check packet length and mtu correctly in erspan tx
[ Upstream commit f192970de860d3ab90aa9e2a22853201a57bde78 ]
Similarly to early patch for erspan_xmit(), the ARPHDR_ETHER device
is the length of the whole ether packet. So skb->len should subtract
the dev->hard_header_len.
Fixes: 1a66a836da63 ("gre: add collect_md mode to ERSPAN tunnel")
Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN")
Signed-off-by: William Tu <u9012063@gmail.com>
Cc: Xin Long <lucien.xin@gmail.com>
Cc: David Laight <David.Laight@aculab.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4/ip_gre.c')
| -rw-r--r-- | net/ipv4/ip_gre.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 467e44d7587d..045331204097 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -579,8 +579,8 @@ static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev, if (gre_handle_offloads(skb, false)) goto err_free_rt; - if (skb->len > dev->mtu) { - pskb_trim(skb, dev->mtu); + if (skb->len > dev->mtu + dev->hard_header_len) { + pskb_trim(skb, dev->mtu + dev->hard_header_len); truncate = true; } @@ -731,8 +731,8 @@ 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->hard_header_len > dev->mtu) { - pskb_trim(skb, dev->mtu); + if (skb->len > dev->mtu + dev->hard_header_len) { + pskb_trim(skb, dev->mtu + dev->hard_header_len); truncate = true; } |