1 files changed, 17 insertions, 18 deletions

diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c
index 746048b13ef3..ae8ec6f27688 100644
--- a/net/netfilter/ipvs/ip_vs_proto_sctp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c
@@ -61,14 +61,27 @@ sctp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
         return 1;
 }
 
+static void sctp_nat_csum(struct sk_buff *skb, sctp_sctphdr_t *sctph,
+                          unsigned int sctphoff)
+{
+        __u32 crc32;
+        struct sk_buff *iter;
+
+        crc32 = sctp_start_cksum((__u8 *)sctph, skb_headlen(skb) - sctphoff);
+        skb_walk_frags(skb, iter)
+                crc32 = sctp_update_cksum((u8 *) iter->data,
+                                          skb_headlen(iter), crc32);
+        sctph->checksum = sctp_end_cksum(crc32);
+
+        skb->ip_summed = CHECKSUM_UNNECESSARY;
+}
+
 static int
 sctp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
                   struct ip_vs_conn *cp, struct ip_vs_iphdr *iph)
 {
         sctp_sctphdr_t *sctph;
         unsigned int sctphoff = iph->len;
-        struct sk_buff *iter;
-        __be32 crc32;
 
 #ifdef CONFIG_IP_VS_IPV6
         if (cp->af == AF_INET6 && iph->fragoffs)
@@ -92,13 +105,7 @@ sctp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
         sctph = (void *) skb_network_header(skb) + sctphoff;
         sctph->source = cp->vport;
 
-        /* Calculate the checksum */
-        crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff);
-        skb_walk_frags(skb, iter)
-                crc32 = sctp_update_cksum((u8 *) iter->data, skb_headlen(iter),
-                                          crc32);
-        crc32 = sctp_end_cksum(crc32);
-        sctph->checksum = crc32;
+        sctp_nat_csum(skb, sctph, sctphoff);
 
         return 1;
 }
@@ -109,8 +116,6 @@ sctp_dnat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
 {
         sctp_sctphdr_t *sctph;
         unsigned int sctphoff = iph->len;
-        struct sk_buff *iter;
-        __be32 crc32;
 
 #ifdef CONFIG_IP_VS_IPV6
         if (cp->af == AF_INET6 && iph->fragoffs)
@@ -134,13 +139,7 @@ sctp_dnat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
         sctph = (void *) skb_network_header(skb) + sctphoff;
         sctph->dest = cp->dport;
 
-        /* Calculate the checksum */
-        crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff);
-        skb_walk_frags(skb, iter)
-                crc32 = sctp_update_cksum((u8 *) iter->data, skb_headlen(iter),
-                                          crc32);
-        crc32 = sctp_end_cksum(crc32);
-        sctph->checksum = crc32;
+        sctp_nat_csum(skb, sctph, sctphoff);
 
         return 1;
 }