src/proto_ip_esp.h

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * Copyright 2012 Markus Amend <markus@netsniff-ng.org>
   4  * Subject to the GPL, version 2.
   5  *
   6  * Encapsulating Security Payload described in RFC4303
   7  */
   8
   9 #ifndef PROTO_ESP_H
  10 #define PROTO_ESP_H
  11
  12 #include <stdio.h>
  13 #include <stdint.h>
  14 #include <netinet/in.h>    /* for ntohs() */
  15
  16 #include "proto_struct.h"
  17 #include "dissector_eth.h"
  18 #include "built_in.h"
  19
  20 struct esp_hdr {
  21         uint32_t h_spi;
  22         uint32_t h_sn;
  23 } __packed;
  24
  25 static inline void esp(struct pkt_buff *pkt)
  26 {
  27         struct esp_hdr *esp_ops;
  28
  29         esp_ops = (struct esp_hdr *) pkt_pull(pkt, sizeof(*esp_ops));
  30         if (esp_ops == NULL)
  31                 return;
  32
  33         tprintf(" [ ESP ");
  34         tprintf("SPI (0x%x), ", ntohl(esp_ops->h_spi));
  35         tprintf("SN (0x%x)", ntohl(esp_ops->h_sn));
  36         tprintf(" ]\n");
  37 }
  38
  39 static inline void esp_less(struct pkt_buff *pkt)
  40 {
  41         struct esp_hdr *esp_ops;
  42
  43         esp_ops = (struct esp_hdr *) pkt_pull(pkt, sizeof(*esp_ops));
  44         if (esp_ops == NULL)
  45                 return;
  46
  47         tprintf(" ESP");
  48 }
  49
  50 struct protocol ip_esp_ops = {
  51         .key = 0x32,
  52         .print_full = esp,
  53         .print_less = esp_less,
  54 };
  55
  56 #endif /* PROTO_ESP_H */