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authorAubrey.Li <aubreylee@gmail.com>2007-04-17 14:46:33 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-05-01 17:05:58 -0700
commit100f4756d42036cca5968ef82542ecf6bccbc8a1 (patch)
tree3fcbb77caf38e60781fae2e7e286adf1bb5d8488
parent3300bb14330a902331bcdfd0f69d9b0945585c51 (diff)
Fix netpoll UDP input path
Netpoll UDP input handler needs to pull up the UDP headers and handle receive checksum offloading properly just like the normal UDP input path does else we get corrupted checksums. [NET]: Fix UDP checksum issue in net poll mode. In net poll mode, the current checksum function doesn't consider the kind of packet which is padded to reach a specific minimum length. I believe that's the problem causing my test case failed. The following patch fixed this issue. Signed-off-by: Aubrey.Li <aubreylee@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--net/core/netpoll.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 823215d8e90f..522e44173e56 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -471,6 +471,13 @@ int __netpoll_rx(struct sk_buff *skb)
if (skb->len < len || len < iph->ihl*4)
goto out;
+ /*
+ * Our transport medium may have padded the buffer out.
+ * Now We trim to the true length of the frame.
+ */
+ if (pskb_trim_rcsum(skb, len))
+ goto out;
+
if (iph->protocol != IPPROTO_UDP)
goto out;