+static inline void ecn_decapsulate(struct sk_buff *skb)
+{
+ /* This is accessing the outer IP header of the tunnel, which we've
+ * already validated to be OK. skb->data is currently set to the start
+ * of the inner Ethernet header, and we've validated ETH_HLEN.
+ */
+ if (unlikely(INET_ECN_is_ce(ip_hdr(skb)->tos))) {
+ __be16 protocol = skb->protocol;
+
+ skb_set_network_header(skb, ETH_HLEN);
+
+ if (skb->protocol == htons(ETH_P_8021Q)) {
+ if (unlikely(!pskb_may_pull(skb, VLAN_ETH_HLEN)))
+ return;
+
+ protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
+ skb_set_network_header(skb, VLAN_ETH_HLEN);
+ }
+
+ if (protocol == htons(ETH_P_IP)) {
+ if (unlikely(!pskb_may_pull(skb, skb_network_offset(skb)
+ + sizeof(struct iphdr))))
+ return;
+
+ IP_ECN_set_ce(ip_hdr(skb));
+ }
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ else if (protocol == htons(ETH_P_IPV6)) {
+ if (unlikely(!pskb_may_pull(skb, skb_network_offset(skb)
+ + sizeof(struct ipv6hdr))))
+ return;
+
+ IP6_ECN_set_ce(ipv6_hdr(skb));
+ }
+#endif
+ }
+}
+
+/* Called with rcu_read_lock. */
+void tnl_rcv(struct vport *vport, struct sk_buff *skb)
+{
+ /* Packets received by this function are in the following state:
+ * - skb->data points to the inner Ethernet header.
+ * - The inner Ethernet header is in the linear data area.
+ * - skb->csum does not include the inner Ethernet header.
+ * - The layer pointers point at the outer headers.
+ */
+
+ struct ethhdr *eh = (struct ethhdr *)skb->data;
+
+ if (likely(ntohs(eh->h_proto) >= 1536))
+ skb->protocol = eh->h_proto;
+ else
+ skb->protocol = htons(ETH_P_802_2);
+
+ skb_dst_drop(skb);
+ nf_reset(skb);
+ secpath_reset(skb);
+
+ ecn_decapsulate(skb);
+ compute_ip_summed(skb, false);
+
+ vport_receive(vport, skb);
+}
+