LXR linux/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
   7struct ip_esp_hdr;
   8
   9static 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
  14static 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
  30struct 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
  43int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
  44int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
  45int esp_input_done2(struct sk_buff *skb, int err);
  46int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
  47int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);
  48int esp6_input_done2(struct sk_buff *skb, int err);
  49#endif
  50