skb_checksum_setup_ip 4765 net/core/skbuff.c 	csum = skb_checksum_setup_ip(skb, ip_hdr(skb)->protocol, off);
skb_checksum_setup_ip 4874 net/core/skbuff.c 	csum = skb_checksum_setup_ip(skb, nexthdr, off);