gre: export gre_handle_offloads() function.

This is required for OVS GRE offloading.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 31 insertions, 32 deletions

diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
index 1cbc46536d1f..5ecc9c49b4dc 100644
--- a/net/ipv4/gre.c
+++ b/net/ipv4/gre.c
@@ -93,6 +93,35 @@ void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
 }
 EXPORT_SYMBOL_GPL(gre_build_header);
 
+struct sk_buff *gre_handle_offloads(struct sk_buff *skb, bool gre_csum)
+{
+        int err;
+
+        if (likely(!skb->encapsulation)) {
+                skb_reset_inner_headers(skb);
+                skb->encapsulation = 1;
+        }
+
+        if (skb_is_gso(skb)) {
+                err = skb_unclone(skb, GFP_ATOMIC);
+                if (unlikely(err))
+                        goto error;
+                skb_shinfo(skb)->gso_type |= SKB_GSO_GRE;
+                return skb;
+        } else if (skb->ip_summed == CHECKSUM_PARTIAL && gre_csum) {
+                err = skb_checksum_help(skb);
+                if (unlikely(err))
+                        goto error;
+        } else if (skb->ip_summed != CHECKSUM_PARTIAL)
+                skb->ip_summed = CHECKSUM_NONE;
+
+        return skb;
+error:
+        kfree_skb(skb);
+        return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(gre_handle_offloads);
+
 static __sum16 check_checksum(struct sk_buff *skb)
 {
         __sum16 csum = 0;
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 362c7c4c13ca..c326e869993a 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -223,31 +223,6 @@ static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
         return PACKET_REJECT;
 }
 
-static struct sk_buff *handle_offloads(struct ip_tunnel *tunnel, struct sk_buff *skb)
-{
-        int err;
-
-        if (skb_is_gso(skb)) {
-                err = skb_unclone(skb, GFP_ATOMIC);
-                if (unlikely(err))
-                        goto error;
-                skb_shinfo(skb)->gso_type |= SKB_GSO_GRE;
-                return skb;
-        } else if (skb->ip_summed == CHECKSUM_PARTIAL &&
-                   tunnel->parms.o_flags&TUNNEL_CSUM) {
-                err = skb_checksum_help(skb);
-                if (unlikely(err))
-                        goto error;
-        } else if (skb->ip_summed != CHECKSUM_PARTIAL)
-                skb->ip_summed = CHECKSUM_NONE;
-
-        return skb;
-
-error:
-        kfree_skb(skb);
-        return ERR_PTR(err);
-}
-
 static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
                        const struct iphdr *tnl_params,
                        __be16 proto)
@@ -255,11 +230,6 @@ static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
         struct ip_tunnel *tunnel = netdev_priv(dev);
         struct tnl_ptk_info tpi;
 
-        if (likely(!skb->encapsulation)) {
-                skb_reset_inner_headers(skb);
-                skb->encapsulation = 1;
-        }
-
         tpi.flags = tunnel->parms.o_flags;
         tpi.proto = proto;
         tpi.key = tunnel->parms.o_key;
@@ -279,7 +249,7 @@ static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
         struct ip_tunnel *tunnel = netdev_priv(dev);
         const struct iphdr *tnl_params;
 
-        skb = handle_offloads(tunnel, skb);
+        skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM));
         if (IS_ERR(skb))
                 goto out;
 
@@ -318,7 +288,7 @@ static netdev_tx_t gre_tap_xmit(struct sk_buff *skb,
 {
         struct ip_tunnel *tunnel = netdev_priv(dev);
 
-        skb = handle_offloads(tunnel, skb);
+        skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM));
         if (IS_ERR(skb))
                 goto out;