centos man page for skb_partial_csum_set

SKB_PARTIAL_CSUM_SET(9) 					 Linux Networking					   SKB_PARTIAL_CSUM_SET(9)

NAME
       skb_partial_csum_set - set up and verify partial csum values for packet

SYNOPSIS
       bool skb_partial_csum_set(struct sk_buff * skb, u16 start, u16 off);

ARGUMENTS
       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.

DESCRIPTION
       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.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   SKB_PARTIAL_CSUM_SET(9)