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