net: unify skb_udp_tunnel_segment() and skb_udp6_tunnel_segment()

As suggested by Pravin, we can unify the code in case of duplicated
code.

Cc: Pravin Shelar <pshelar@nicira.com>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 1 deletions

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 0b24508bcdc4..74d2c95db57f 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2337,7 +2337,7 @@ struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
                 uh->len = htons(skb->len - udp_offset);
 
                 /* csum segment if tunnel sets skb with csum. */
-                if (unlikely(uh->check)) {
+                if (protocol == htons(ETH_P_IP) && unlikely(uh->check)) {
                         struct iphdr *iph = ip_hdr(skb);
 
                         uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
@@ -2348,7 +2348,18 @@ struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
                         if (uh->check == 0)
                                 uh->check = CSUM_MANGLED_0;
 
+                } else if (protocol == htons(ETH_P_IPV6)) {
+                        struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+                        u32 len = skb->len - udp_offset;
+
+                        uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr,
+                                                     len, IPPROTO_UDP, 0);
+                        uh->check = csum_fold(skb_checksum(skb, udp_offset, len, 0));
+                        if (uh->check == 0)
+                                uh->check = CSUM_MANGLED_0;
+                        skb->ip_summed = CHECKSUM_NONE;
                 }
+
                 skb->protocol = protocol;
         } while ((skb = skb->next));
 out: