virtio: Implement skb_partial_csum_set, for setting partial csums on untrusted packets.

Use it in virtio_net (replacing buggy version there), it's also going
to be used by TAP for partial csum support.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: David S. Miller <davem@davemloft.net>

3 files changed, 31 insertions, 10 deletions

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 5413dbf3d4ac..a60505c8f82a 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -83,17 +83,8 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
 
         if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
                 pr_debug("Needs csum!\n");
-                skb->ip_summed = CHECKSUM_PARTIAL;
-                skb->csum_start = hdr->csum_start;
-                skb->csum_offset = hdr->csum_offset;
-                if (skb->csum_start > skb->len - 2
-                    || skb->csum_offset > skb->len - 2) {
-                        if (net_ratelimit())
-                                printk(KERN_WARNING "%s: csum=%u/%u len=%u\n",
-                                       dev->name, skb->csum_start,
-                                       skb->csum_offset, skb->len);
+                if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset))
                         goto frame_err;
-                }
         }
 
         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index dfe975a9967e..412672a79e8a 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1810,5 +1810,6 @@ static inline void skb_forward_csum(struct sk_buff *skb)
                 skb->ip_summed = CHECKSUM_NONE;
 }
 
+bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off);
 #endif  /* __KERNEL__ */
 #endif  /* _LINUX_SKBUFF_H */
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 98420f9c4b6d..4e354221ec23 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2461,6 +2461,34 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
         return elt;
 }
 
+/**
+ * skb_partial_csum_set - set up and verify partial csum values for packet
+ * @skb: the skb to set
+ * @start: the number of bytes after skb->data to start checksumming.
+ * @off: the offset from start to place the checksum.
+ *
+ * For untrusted partially-checksummed packets, we need to make sure the values
+ * for skb->csum_start and skb->csum_offset are valid so we don't oops.
+ *
+ * This function checks and sets those values and skb->ip_summed: if this
+ * returns false you should drop the packet.
+ */
+bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off)
+{
+        if (unlikely(start > skb->len - 2) ||
+            unlikely((int)start + off > skb->len - 2)) {
+                if (net_ratelimit())
+                        printk(KERN_WARNING
+                               "bad partial csum: csum=%u/%u len=%u\n",
+                               start, off, skb->len);
+                return false;
+        }
+        skb->ip_summed = CHECKSUM_PARTIAL;
+        skb->csum_start = skb_headroom(skb) + start;
+        skb->csum_offset = off;
+        return true;
+}
+
 EXPORT_SYMBOL(___pskb_trim);
 EXPORT_SYMBOL(__kfree_skb);
 EXPORT_SYMBOL(kfree_skb);
@@ -2497,3 +2525,4 @@ EXPORT_SYMBOL(skb_append_datato_frags);
 
 EXPORT_SYMBOL_GPL(skb_to_sgvec);
 EXPORT_SYMBOL_GPL(skb_cow_data);
+EXPORT_SYMBOL_GPL(skb_partial_csum_set);