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authorXin Long <lucien.xin@gmail.com>2017-10-01 22:00:53 +0800
committerDavid S. Miller <davem@davemloft.net>2017-10-01 22:30:32 -0700
commit935a9749a36828af0e8be224a5cd4bc758112c34 (patch)
tree48aad16a52961261ec52b28feaaa2b2412ef2b0e /net
parentaad06212d36cf34859428a0a279e5c14ee5c9e26 (diff)
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ip_gre: get key from session_id correctly in erspan_rcv
erspan only uses the first 10 bits of session_id as the key to look up the tunnel. But in erspan_rcv, it missed 'session_id & ID_MASK' when getting the key from session_id. If any other flag is also set in session_id in a packet, it would fail to find the tunnel due to incorrect key in erspan_rcv. This patch is to add 'session_id & ID_MASK' there and also remove the unnecessary variable session_id. 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')
-rw-r--r--net/ipv4/ip_gre.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 8b837f6f5532..b25b1e5112d0 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -259,7 +259,6 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
struct ip_tunnel *tunnel;
struct erspanhdr *ershdr;
const struct iphdr *iph;
- __be32 session_id;
__be32 index;
int len;
@@ -275,8 +274,7 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
/* The original GRE header does not have key field,
* Use ERSPAN 10-bit session ID as key.
*/
- session_id = cpu_to_be32(ntohs(ershdr->session_id));
- tpi->key = session_id;
+ tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK);
index = ershdr->md.index;
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,
tpi->flags | TUNNEL_KEY,