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 | |
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 | |
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 | |