On Tue, Feb 11, 2014 at 03:03:42PM -0500, Guibin(Bill) Tian wrote:
> Hi,
> I am looking for the code in linux kernel that verifies the checksum of TCP
> header and IP header for inbound packet. The packet supposes to be dropped
> if the checksum doesn't match.
Here is some code that checks the TCP checksum.
/*
* Calculate(/check) TCP checksum
*/
static inline __sum16 tcp_v4_check(int len, __be32 saddr,
__be32 daddr, __wsum base)
{
return csum_tcpudp_magic(saddr,daddr,len,IPPROTO_TCP,base);
}
from: include/net/tcp.h
also, try searching for csum_error in net/ipv4/tcp_ipv4.c
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