1 files changed, 19 insertions, 10 deletions

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index b15c78ac3f23..d4f2daca0c33 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -214,6 +214,13 @@ struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
                 return segs;
         }
 
+        /* GSO partial and frag_list segmentation only requires splitting
+         * the frame into an MSS multiple and possibly a remainder, both
+         * cases return a GSO skb. So update the mss now.
+         */
+        if (skb_is_gso(segs))
+                mss *= skb_shinfo(segs)->gso_segs;
+
         seg = segs;
         uh = udp_hdr(seg);
 
@@ -232,6 +239,12 @@ struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
                 uh->len = newlen;
                 uh->check = check;
 
+                if (seg->ip_summed == CHECKSUM_PARTIAL)
+                        gso_reset_checksum(seg, ~check);
+                else
+                        uh->check = gso_make_checksum(seg, ~check) ? :
+                                    CSUM_MANGLED_0;
+
                 seg = seg->next;
                 uh = udp_hdr(seg);
         }
@@ -244,6 +257,11 @@ struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
         uh->len = newlen;
         uh->check = check;
 
+        if (seg->ip_summed == CHECKSUM_PARTIAL)
+                gso_reset_checksum(seg, ~check);
+        else
+                uh->check = gso_make_checksum(seg, ~check) ? : CSUM_MANGLED_0;
+
         /* update refcount for the packet */
         refcount_add(sum_truesize - gso_skb->truesize, &sk->sk_wmem_alloc);
 
@@ -251,15 +269,6 @@ struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
 }
 EXPORT_SYMBOL_GPL(__udp_gso_segment);
 
-static struct sk_buff *__udp4_gso_segment(struct sk_buff *gso_skb,
-                                          netdev_features_t features)
-{
-        if (!can_checksum_protocol(features, htons(ETH_P_IP)))
-                return ERR_PTR(-EIO);
-
-        return __udp_gso_segment(gso_skb, features);
-}
-
 static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
                                          netdev_features_t features)
 {
@@ -283,7 +292,7 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
                 goto out;
 
         if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
-                return __udp4_gso_segment(skb, features);
+                return __udp_gso_segment(skb, features);
 
         mss = skb_shinfo(skb)->gso_size;
         if (unlikely(skb->len <= mss))