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 #define ESP_SKB_FRAG_MAXSIZE (PAGE_SIZE << SKB_FRAG_PAGE_ORDER) 8 9 struct ip_esp_hdr; 10 11 static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb) 12 { 13 return (struct ip_esp_hdr *)skb_transport_header(skb); 14 } 15 16 static inline void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto) 17 { 18 /* Fill padding... */ 19 if (tfclen) { 20 memset(tail, 0, tfclen); 21 tail += tfclen; 22 } 23 do { 24 int i; 25 for (i = 0; i < plen - 2; i++) 26 tail[i] = i + 1; 27 } while (0); 28 tail[plen - 2] = plen - 2; 29 tail[plen - 1] = proto; 30 } 31 32 struct esp_info { 33 struct ip_esp_hdr *esph; 34 __be64 seqno; 35 int tfclen; 36 int tailen; 37 int plen; 38 int clen; 39 int len; 40 int nfrags; 41 __u8 proto; 42 bool inplace; 43 }; 44 45 int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp); 46 int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp); 47 int esp_input_done2(struct sk_buff *skb, int err); 48 int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp); 49 int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp); 50 int esp6_input_done2(struct sk_buff *skb, int err); 51 #endif 52