Revert "ip_gre: Remove even more unused code"

This reverts commit 42a059e02bf343787951be2824c579e1c9a26e12.

Not all the necessary ipgre prefixed code was removed that
should have been.  Another patch will follow with the correct
removed code.

Signed-off-by: Greg Rose <gvrose8192@gmail.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>

diff --git a/datapath/linux/compat/ip_gre.c b/datapath/linux/compat/ip_gre.c
index 8536241146e6718a97f1cff175ed444ff891163e..3b7e607d597cfd70f7da0c9b3168c326a4effe51 100644 (file)
--- a/datapath/linux/compat/ip_gre.c
+++ b/datapath/linux/compat/ip_gre.c
@@ -922,6 +922,44 @@ static int erspan_tunnel_init(struct net_device *dev)
        return ip_tunnel_init(dev);
 }
 
+static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
+                       unsigned short type,
+                       const void *daddr, const void *saddr, unsigned int len)
+{
+       struct ip_tunnel *t = netdev_priv(dev);
+       struct iphdr *iph;
+       struct gre_base_hdr *greh;
+
+       iph = (struct iphdr *)__skb_push(skb, t->hlen + sizeof(*iph));
+       greh = (struct gre_base_hdr *)(iph+1);
+       greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags);
+       greh->protocol = htons(type);
+
+       memcpy(iph, &t->parms.iph, sizeof(struct iphdr));
+
+       /* Set the source hardware address. */
+       if (saddr)
+               memcpy(&iph->saddr, saddr, 4);
+       if (daddr)
+               memcpy(&iph->daddr, daddr, 4);
+       if (iph->daddr)
+               return t->hlen + sizeof(*iph);
+
+       return -(t->hlen + sizeof(*iph));
+}
+
+static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr)
+{
+       const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb);
+       memcpy(haddr, &iph->saddr, 4);
+       return 4;
+}
+
+static const struct header_ops ipgre_header_ops = {
+       .create = ipgre_header,
+       .parse  = ipgre_header_parse,
+};
+
 static int ipgre_tunnel_init(struct net_device *dev)
 {
        struct ip_tunnel *tunnel = netdev_priv(dev);