include/net/esp.h

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