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| author | Tom Herbert <therbert@google.com> | 2014-09-08 08:29:12 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-09-08 15:23:05 -0700 |
| commit | 1e701f16982a9d15488a5aa8c7f5c41444b1de67 (patch) | |
| tree | ffd2de95a203e68a1f070e80955738f1006dd826 /net/ipv4/gre_demux.c | |
| parent | db91b724b53b1cfd0e258d7cf3a03a062a89fe2d (diff) | |
| download | linux-1e701f16982a9d15488a5aa8c7f5c41444b1de67.tar.gz linux-1e701f16982a9d15488a5aa8c7f5c41444b1de67.tar.bz2 linux-1e701f16982a9d15488a5aa8c7f5c41444b1de67.zip | |
net: Fix GRE RX to use skb_transport_header for GRE header offset
GRE assumes that the GRE header is at skb_network_header +
ip_hrdlen(skb). It is more general to use skb_transport_header
and this allows the possbility of inserting additional header
between IP and GRE (which is what we will done in Generic UDP
Encapsulation for GRE).
Signed-off-by: Tom Herbert <therbert@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/gre_demux.c')
| -rw-r--r-- | net/ipv4/gre_demux.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/net/ipv4/gre_demux.c b/net/ipv4/gre_demux.c index 7e0756da8737..4a7b5b2a1ce3 100644 --- a/net/ipv4/gre_demux.c +++ b/net/ipv4/gre_demux.c @@ -98,7 +98,6 @@ EXPORT_SYMBOL_GPL(gre_build_header); static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi, bool *csum_err) { - unsigned int ip_hlen = ip_hdrlen(skb); const struct gre_base_hdr *greh; __be32 *options; int hdr_len; @@ -106,7 +105,7 @@ static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi, if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr)))) return -EINVAL; - greh = (struct gre_base_hdr *)(skb_network_header(skb) + ip_hlen); + greh = (struct gre_base_hdr *)skb_transport_header(skb); if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING))) return -EINVAL; @@ -116,7 +115,7 @@ static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi, if (!pskb_may_pull(skb, hdr_len)) return -EINVAL; - greh = (struct gre_base_hdr *)(skb_network_header(skb) + ip_hlen); + greh = (struct gre_base_hdr *)skb_transport_header(skb); tpi->proto = greh->protocol; options = (__be32 *)(greh + 1); |