Dave,
The current kernel doesn't verify the udp checksum if user doesn't set a
socket filter.It's fine for LAN. But for WAN, it's not a good option.
Shall we fix it? Below is the patch to make udp checksum be always
available.
[IPV4] UDP: Always checksum even if without socket filter
Make udp checksum be always available even if without socket filter.
Signed-off-by: Wang Chen <[EMAIL PROTECTED]>
---
udp.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)
--- linux-2.6.24-rc2.org/net/ipv4/udp.c 2007-11-09 16:37:57.000000000 +0800
+++ linux-2.6.24-rc2/net/ipv4/udp.c 2007-11-16 10:10:35.000000000 +0800
@@ -1011,10 +1011,8 @@ int udp_queue_rcv_skb(struct sock * sk,
}
}
- if (sk->sk_filter) {
- if (udp_lib_checksum_complete(skb))
- goto drop;
- }
+ if (udp_lib_checksum_complete(skb))
+ goto drop;
if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
/* Note that an ENOMEM error is charged twice */
-
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