1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_ESP_H
3 #define _NET_ESP_H
4 
5 #include <linux/skbuff.h>
6 
7 struct ip_esp_hdr;
8 struct xfrm_state;
9 
ip_esp_hdr(const struct sk_buff * skb)10 static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb)
11 {
12 	return (struct ip_esp_hdr *)skb_transport_header(skb);
13 }
14 
esp_output_fill_trailer(u8 * tail,int tfclen,int plen,__u8 proto)15 static inline void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
16 {
17 	/* Fill padding... */
18 	if (tfclen) {
19 		memset(tail, 0, tfclen);
20 		tail += tfclen;
21 	}
22 	do {
23 		int i;
24 		for (i = 0; i < plen - 2; i++)
25 			tail[i] = i + 1;
26 	} while (0);
27 	tail[plen - 2] = plen - 2;
28 	tail[plen - 1] = proto;
29 }
30 
31 struct esp_info {
32 	struct	ip_esp_hdr *esph;
33 	__be64	seqno;
34 	int	tfclen;
35 	int	tailen;
36 	int	plen;
37 	int	clen;
38 	int 	len;
39 	int 	nfrags;
40 	__u8	proto;
41 	bool	inplace;
42 };
43 
44 int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
45 int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
46 int esp_input_done2(struct sk_buff *skb, int err);
47 int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
48 int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
49 int esp6_input_done2(struct sk_buff *skb, int err);
50 #endif
51