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 #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