1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _NET_ESP_H
3*4882a593Smuzhiyun #define _NET_ESP_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/skbuff.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun struct ip_esp_hdr;
8*4882a593Smuzhiyun
ip_esp_hdr(const struct sk_buff * skb)9*4882a593Smuzhiyun static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb)
10*4882a593Smuzhiyun {
11*4882a593Smuzhiyun return (struct ip_esp_hdr *)skb_transport_header(skb);
12*4882a593Smuzhiyun }
13*4882a593Smuzhiyun
esp_output_fill_trailer(u8 * tail,int tfclen,int plen,__u8 proto)14*4882a593Smuzhiyun static inline void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun /* Fill padding... */
17*4882a593Smuzhiyun if (tfclen) {
18*4882a593Smuzhiyun memset(tail, 0, tfclen);
19*4882a593Smuzhiyun tail += tfclen;
20*4882a593Smuzhiyun }
21*4882a593Smuzhiyun do {
22*4882a593Smuzhiyun int i;
23*4882a593Smuzhiyun for (i = 0; i < plen - 2; i++)
24*4882a593Smuzhiyun tail[i] = i + 1;
25*4882a593Smuzhiyun } while (0);
26*4882a593Smuzhiyun tail[plen - 2] = plen - 2;
27*4882a593Smuzhiyun tail[plen - 1] = proto;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun struct esp_info {
31*4882a593Smuzhiyun struct ip_esp_hdr *esph;
32*4882a593Smuzhiyun __be64 seqno;
33*4882a593Smuzhiyun int tfclen;
34*4882a593Smuzhiyun int tailen;
35*4882a593Smuzhiyun int plen;
36*4882a593Smuzhiyun int clen;
37*4882a593Smuzhiyun int len;
38*4882a593Smuzhiyun int nfrags;
39*4882a593Smuzhiyun __u8 proto;
40*4882a593Smuzhiyun bool inplace;
41*4882a593Smuzhiyun };
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
44*4882a593Smuzhiyun int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
45*4882a593Smuzhiyun int esp_input_done2(struct sk_buff *skb, int err);
46*4882a593Smuzhiyun int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
47*4882a593Smuzhiyun int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
48*4882a593Smuzhiyun int esp6_input_done2(struct sk_buff *skb, int err);
49*4882a593Smuzhiyun #endif
50