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| author | Xin Long <lucien.xin@gmail.com> | 2017-10-01 16:00:55 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-02 07:30:32 +0200 |
| commit | c122fda271717f4fc618e0a31e833941fd5f1efd (patch) | |
| tree | 3cb94ac33a0d66a34ddeaf8ba7aba32a43788518 /net/ipv4 | |
| parent | ip_gre: check packet length and mtu correctly in erspan_xmit (diff) | |
| download | linux-c122fda271717f4fc618e0a31e833941fd5f1efd.tar.xz linux-c122fda271717f4fc618e0a31e833941fd5f1efd.zip | |
ip_gre: set tunnel hlen properly in erspan_tunnel_init
According to __gre_tunnel_init, tunnel->hlen should be set as the
headers' length between inner packet and outer iphdr.
It would be used especially to calculate a proper mtu when updating
mtu in tnl_update_pmtu. Now without setting it, a bigger mtu value
than expected would be updated, which hurts performance a lot.
This patch is to fix it by setting tunnel->hlen with:
tunnel->tun_hlen + tunnel->encap_hlen + sizeof(struct erspanhdr)
Fixes: 84e54fe0a5ea ("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>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ip_gre.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 2a4ef9dc48ff..fad0bb1e3e9a 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -1245,7 +1245,9 @@ static int erspan_tunnel_init(struct net_device *dev) tunnel->tun_hlen = 8; tunnel->parms.iph.protocol = IPPROTO_GRE; - t_hlen = tunnel->hlen + sizeof(struct iphdr) + sizeof(struct erspanhdr); + tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + + sizeof(struct erspanhdr); + t_hlen = tunnel->hlen + sizeof(struct iphdr); dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4; dev->mtu = ETH_DATA_LEN - t_hlen - 4; |