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>

diff --git a/include/net/gre.h b/include/net/gre.h
index cbb9d51..a5a4ddf 100644 (file)
--- a/include/net/gre.h
+++ b/include/net/gre.h
@@ -34,6 +34,7 @@ int gre_cisco_register(struct gre_cisco_protocol *proto);
 int gre_cisco_unregister(struct gre_cisco_protocol *proto);
 void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
                      int hdr_len);
+struct sk_buff *gre_handle_offloads(struct sk_buff *skb, bool gre_csum);
 
 static inline int ip_gre_calc_hlen(__be16 o_flags)
 {

diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
index 1cbc465..5ecc9c4 100644 (file)
--- 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 362c7c4..c326e86 100644 (file)
--- 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;