skb_chkf 4478 include/linux/skbuff.h __sum16(*skb_chkf)(struct sk_buff *skb)); skb_chkf 4970 net/core/skbuff.c __sum16(*skb_chkf)(struct sk_buff *skb)) skb_chkf 4984 net/core/skbuff.c ret = skb_chkf(skb_chk);