static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
{
struct net *net = dev_net(skb->dev);
struct metadata_dst tun_dst;
struct ip_tunnel_net *itn;
const struct iphdr *iph;
struct ip_tunnel *tunnel;
if (tpi->proto != htons(ETH_P_TEB))
return PACKET_REJECT;
itn = net_generic(net, gre_tap_net_id);
iph = ip_hdr(skb);
tunnel = rcu_dereference(itn->collect_md_tun);
if (tunnel) {
__be16 flags;
__be64 tun_id;
int err;
skb_pop_mac_header(skb);
flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY);
tun_id = key_to_tunnel_id(tpi->key);
ovs_ip_tun_rx_dst(&tun_dst, skb, flags, tun_id, 0);
skb_reset_network_header(skb);
err = IP_ECN_decapsulate(iph, skb);
if (unlikely(err)) {
if (err > 1) {
++tunnel->dev->stats.rx_frame_errors;
++tunnel->dev->stats.rx_errors;
return PACKET_REJECT;
}
}
ovs_ip_tunnel_rcv(tunnel->dev, skb, &tun_dst);
return PACKET_RCVD;
}
return PACKET_REJECT;
}
static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
struct ip_tunnel_net *itn, int hdr_len, bool raw_proto)
{
struct metadata_dst tun_dst;
const struct iphdr *iph;
struct ip_tunnel *tunnel;
iph = ip_hdr(skb);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
iph->saddr, iph->daddr, tpi->key);
if (tunnel) {
if (__iptunnel_pull_header(skb, hdr_len, tpi->proto,
raw_proto, false) < 0)
goto drop;
if (tunnel->dev->type != ARPHRD_NONE)
skb_pop_mac_header(skb);
else
skb_reset_mac_header(skb);
if (tunnel->collect_md) {
__be16 flags;
__be64 tun_id;
flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY);
tun_id = key32_to_tunnel_id(tpi->key);
ovs_ip_tun_rx_dst(&tun_dst, skb, flags, tun_id, 0);
}
ovs_ip_tunnel_rcv(tunnel->dev, skb, &tun_dst);
return PACKET_RCVD;
}
return PACKET_NEXT;
drop:
kfree_skb(skb);
return PACKET_RCVD;
}