xref: /openbmc/linux/include/net/esp.h (revision c4f7ac64)
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 
9 static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb)
10 {
11 	return (struct ip_esp_hdr *)skb_transport_header(skb);
12 }
13 
14 static inline void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
15 {
16 	/* Fill padding... */
17 	if (tfclen) {
18 		memset(tail, 0, tfclen);
19 		tail += tfclen;
20 	}
21 	do {
22 		int i;
23 		for (i = 0; i < plen - 2; i++)
24 			tail[i] = i + 1;
25 	} while (0);
26 	tail[plen - 2] = plen - 2;
27 	tail[plen - 1] = proto;
28 }
29 
30 struct esp_info {
31 	struct	ip_esp_hdr *esph;
32 	__be64	seqno;
33 	int	tfclen;
34 	int	tailen;
35 	int	plen;
36 	int	clen;
37 	int 	len;
38 	int 	nfrags;
39 	__u8	proto;
40 	bool	inplace;
41 };
42 
43 int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
44 int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
45 int esp_input_done2(struct sk_buff *skb, int err);
46 int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
47 int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
48 int esp6_input_done2(struct sk_buff *skb, int err);
49 #endif
50