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