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vxlan: ICMP error lookup handler

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Export an encap_err_lookup() operation to match an ICMP error against a
valid VNI.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Brivio 2018-11-08 12:19:15 +01:00 committed by David S. Miller
parent a36e185e8c
commit c3a43b9fec
1 changed files with 29 additions and 0 deletions
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29
drivers/net/vxlan.c
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@ -1552,6 +1552,34 @@ drop:
return 0;
}
/* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
{
struct vxlan_dev *vxlan;
struct vxlan_sock *vs;
struct vxlanhdr *hdr;
__be32 vni;
if (skb->len < VXLAN_HLEN)
return -EINVAL;
hdr = vxlan_hdr(skb);
if (!(hdr->vx_flags & VXLAN_HF_VNI))
return -EINVAL;
vs = rcu_dereference_sk_user_data(sk);
if (!vs)
return -ENOENT;
vni = vxlan_vni(hdr->vx_vni);
vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
if (!vxlan)
return -ENOENT;
return 0;
}
static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
@ -2948,6 +2976,7 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
tunnel_cfg.sk_user_data = vs;
tunnel_cfg.encap_type = 1;
tunnel_cfg.encap_rcv = vxlan_rcv;
tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
tunnel_cfg.encap_destroy = NULL;
tunnel_cfg.gro_receive = vxlan_gro_receive;
tunnel_cfg.gro_complete = vxlan_gro_complete;