[NET]: Use csum_start offset instead of skb_transport_header

The skb transport pointer is currently used to specify the start
of the checksum region for transmit checksum offload.  Unfortunately,
the same pointer is also used during receive side processing.

This creates a problem when we want to retransmit a received
packet with partial checksums since the skb transport pointer
would be overwritten.

This patch solves this problem by creating a new 16-bit csum_start
offset value to replace the skb transport header for the purpose
of checksums.  This offset is calculated from skb->head so that
it does not have to change when skb->data changes.

No extra space is required since csum_offset itself fits within
a 16-bit word so we can use the other 16 bits for csum_start.

For backwards compatibility, just before we push a packet with
partial checksums off into the device driver, we set the skb
transport header to what it would have been under the old scheme.

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

2 files changed, 16 insertions, 11 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index fec8cf27f75..d23972f56fc 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1155,7 +1155,7 @@ EXPORT_SYMBOL(netif_device_attach);
 int skb_checksum_help(struct sk_buff *skb)
 {
         __wsum csum;
-        int ret = 0, offset = skb_transport_offset(skb);
+        int ret = 0, offset;
 
         if (skb->ip_summed == CHECKSUM_COMPLETE)
                 goto out_set_summed;
@@ -1171,15 +1171,16 @@ int skb_checksum_help(struct sk_buff *skb)
                         goto out;
         }
 
+        offset = skb->csum_start - skb_headroom(skb);
         BUG_ON(offset > (int)skb->len);
         csum = skb_checksum(skb, offset, skb->len-offset, 0);
 
-        offset = skb->tail - skb->transport_header;
+        offset = skb_headlen(skb) - offset;
         BUG_ON(offset <= 0);
         BUG_ON(skb->csum_offset + 2 > offset);
 
-        *(__sum16 *)(skb_transport_header(skb) +
-                     skb->csum_offset) = csum_fold(csum);
+        *(__sum16 *)(skb->head + skb->csum_start + skb->csum_offset) =
+                csum_fold(csum);
 out_set_summed:
         skb->ip_summed = CHECKSUM_NONE;
 out:
@@ -1431,12 +1432,16 @@ int dev_queue_xmit(struct sk_buff *skb)
         /* If packet is not checksummed and device does not support
          * checksumming for this protocol, complete checksumming here.
          */
-        if (skb->ip_summed == CHECKSUM_PARTIAL &&
-            (!(dev->features & NETIF_F_GEN_CSUM) &&
-             (!(dev->features & NETIF_F_IP_CSUM) ||
-              skb->protocol != htons(ETH_P_IP))))
-                if (skb_checksum_help(skb))
-                        goto out_kfree_skb;
+        if (skb->ip_summed == CHECKSUM_PARTIAL) {
+                skb_set_transport_header(skb, skb->csum_start -
+                                              skb_headroom(skb));
+
+                if (!(dev->features & NETIF_F_GEN_CSUM) &&
+                    (!(dev->features & NETIF_F_IP_CSUM) ||
+                     skb->protocol != htons(ETH_P_IP)))
+                        if (skb_checksum_help(skb))
+                                goto out_kfree_skb;
+        }
 
 gso:
         spin_lock_prefetch(&dev->queue_lock);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 4965df29768..52a4fdd4f31 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1358,7 +1358,7 @@ void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to)
         long csstart;
 
         if (skb->ip_summed == CHECKSUM_PARTIAL)
-                csstart = skb_transport_offset(skb);
+                csstart = skb->csum_start - skb_headroom(skb);
         else
                 csstart = skb_headlen(skb);