/* SPDX-License-Identifier: GPL-2.0 */#ifndef _NET_ESP_H#define _NET_ESP_H #include <linux/skbuff.h> struct ip_esp_hdr; static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb){	return (struct ip_esp_hdr *)skb_transport_header(skb);} static inline void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto){	/* Fill padding... */	if (tfclen) {		memset(tail, 0, tfclen);		tail += tfclen;	}	do {		int i;		for (i = 0; i < plen - 2; i++)			tail[i] = i + 1;	} while (0);	tail[plen - 2] = plen - 2;	tail[plen - 1] = proto;} struct esp_info {	struct	ip_esp_hdr *esph;	__be64	seqno;	int	tfclen;	int	tailen;	int	plen;	int	clen;	int 	len;	int 	nfrags;	__u8	proto;	bool	inplace;}; int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);int esp_input_done2(struct sk_buff *skb, int err);int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);int esp6_input_done2(struct sk_buff *skb, int err);#endif