[NET] gso: Fix up GSO packets with broken checksums

Certain subsystems in the stack (e.g., netfilter) can break the partial
checksum on GSO packets.  Until they're fixed, this patch allows this to
work by recomputing the partial checksums through the GSO mechanism.

Once they've all been converted to update the partial checksum instead of
clearing it, this workaround can be removed.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 3 insertions, 0 deletions

diff --git a/include/net/protocol.h b/include/net/protocol.h
index a225d6371cb1..c643bce64e55 100644
--- a/include/net/protocol.h
+++ b/include/net/protocol.h
@@ -36,6 +36,7 @@
 struct net_protocol {
         int                     (*handler)(struct sk_buff *skb);
         void                    (*err_handler)(struct sk_buff *skb, u32 info);
+        int                     (*gso_send_check)(struct sk_buff *skb);
         struct sk_buff         *(*gso_segment)(struct sk_buff *skb,
                                                int features);
         int                     no_policy;
@@ -51,6 +52,7 @@ struct inet6_protocol
                                int type, int code, int offset,
                                __u32 info);
 
+        int     (*gso_send_check)(struct sk_buff *skb);
         struct sk_buff *(*gso_segment)(struct sk_buff *skb,
                                        int features);
 
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 3cd803b0d7a5..0720bddff1e9 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1086,6 +1086,7 @@ extern struct request_sock_ops tcp_request_sock_ops;
 
 extern int tcp_v4_destroy_sock(struct sock *sk);
 
+extern int tcp_v4_gso_send_check(struct sk_buff *skb);
 extern struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features);
 
 #ifdef CONFIG_PROC_FS