| Message ID | 1393488040-22005-7-git-send-email-steffen.klassert@secunet.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c index 6d430ff..4fff644 100644 --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -280,13 +280,17 @@ static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, { unsigned int h; __be32 remote; + __be32 i_key = parms->i_key; if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) remote = parms->iph.daddr; else remote = 0; - h = ip_tunnel_hash(parms->i_key, remote); + if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI)) + i_key = 0; + + h = ip_tunnel_hash(i_key, remote); return &itn->tunnels[h]; }
Vti uses the o_key to mark packets that were transmitted or received by a vti interface. Unfortunately we can't apply different marks to in and outbound packets with only one key availabe. Vti interfaces typically use wildcard selectors for vti IPsec policies. On forwarding, the same output policy will match for both directions. This generates a loop between the IPsec gateways until the ttl of the packet is exceeded. The gre i_key/o_key are usually there to find the right gre tunnel during a lookup. When vti uses the i_key to mark packets, the tunnel lookup does not work any more because vti does not use the gre keys as a hash key for the lookup. This patch workarounds this my not including the i_key when comupting the hash for the tunnel lookup in case of vti tunnels. With this we have separate keys available for the transmitting and receiving side of the vti interface. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> --- net/ipv4/ip_tunnel.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)