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datapath: supply a dummy err_handler of gre_cisco_protocol to prevent kernel crash

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When use gre vport, openvswitch register a gre_cisco_protocol but
does not supply a err_handler with it. The gre_cisco_err() in
net/ipv4/gre_demux.c expect err_handler be provided with the
gre_cisco_protocol implementation, and call ->err_handler() without
existence check, cause the kernel crash.

This patch provide a err_handler to fix this bug.

Signed-off-by: Wei Zhang <asuka.com@163.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Wei Zhang 2014-04-05 16:17:35 -07:00 committed by Jesse Gross
parent 6d616e9906
commit 43f31ef528
2 changed files with 22 additions and 0 deletions
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2
datapath/linux/compat/include/net/gre.h
View File

@ -17,6 +17,8 @@
struct gre_cisco_protocol {
int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi);
int (*err_handler)(struct sk_buff *skb, u32 info,
const struct tnl_ptk_info *tpi);
u8 priority;
};

20
datapath/vport-gre.c
View File

@ -116,6 +116,25 @@ static int gre_rcv(struct sk_buff *skb,
return PACKET_RCVD;
}
/* Called with rcu_read_lock and BH disabled. */
static int gre_err(struct sk_buff *skb, u32 info,
const struct tnl_ptk_info *tpi)
{
struct ovs_net *ovs_net;
struct vport *vport;
ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
if ((tpi->flags & TUNNEL_KEY) && (tpi->flags & TUNNEL_SEQ))
vport = rcu_dereference(ovs_net->vport_net.gre64_vport);
else
vport = rcu_dereference(ovs_net->vport_net.gre_vport);
if (unlikely(!vport))
return PACKET_REJECT;
else
return PACKET_RCVD;
}
static int __send(struct vport *vport, struct sk_buff *skb,
int tunnel_hlen,
__be32 seq, __be16 gre64_flag)
@ -187,6 +206,7 @@ error:
static struct gre_cisco_protocol gre_protocol = {
.handler = gre_rcv,
.err_handler = gre_err,
.priority = 1,
};