Update checksum for received skb after pull
void skb_postpull_rcsum(struct sk_buff * skb, const void * start, unsigned int len);
skb
buffer to update
start
start of data before pull
len
length of data pulled
After doing a pull on a received packet, you need to call this to update the CHECKSUM_COMPLETE checksum, or set ip_summed to CHECKSUM_NONE so that it can be recomputed from scratch.