ip_esp_hdr          6 include/net/esp.h struct ip_esp_hdr;
ip_esp_hdr          8 include/net/esp.h static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb)
ip_esp_hdr         10 include/net/esp.h 	return (struct ip_esp_hdr *)skb_transport_header(skb);