coppino/ipv6.h

#ifndef COPPINO_IPV6_H
#define COPPINO_IPV6_H

namespace ipv6 {
  /* maximum length for an IPv6 packet */
  const uint8_t LEN = 128;

  /* ICMP Types */
  const uint8_t ICMP_ECHO_REQUEST_TYPE = 128;
  const uint8_t ICMP_ECHO_REPLY_TYPE   = 129;
  const uint8_t ICMP_RADV_TYPE         = 134;

  /* Next-Header Types */
  const uint8_t NH_ICMP = 58;
  const uint8_t NH_UDP  = 17;

  class IPv6Addr {
    private:
      char address[16];
    public:
      IPv6Addr();
      IPv6Addr(const char* address);
  };

  extern const IPv6Addr ALL_NODES_ADDRESS;

  class IPv6Packet {
    private:
      char packet[LEN];
    public:
      IPv6Packet();
      IPv6Packet(const char* buffer, int len);
      void setLen(int len);
      int getLen();
      void setSrcAddress(const IPv6Addr* address);
      const IPv6Addr* getSrcAddress();
      void setDstAddress(const IPv6Addr* address);
      const IPv6Addr* getDstAddress();
      void setNextHeader(uint8_t next_header);
      void setFlow(const char* flow);
      void setPayload(char* payload, int len);
      void send();

      void doAction();
  };

  /* incoming and outgoing packets buffer */
  extern IPv6Packet packetin;
  extern IPv6Packet packetout;

  /* Note: content of message may be changed */
  int handleICMP(char* output_buffer, const char* input_buffer, int len);

  /* Compute internet checksum. Actually it is not so straightforward: */
  uint16_t compute_checksum(
    const IPv6Addr* src_addr, /* source IPv6 address      */
    const IPv6Addr* dst_addr, /* destination IPv6 address */
    uint8_t next_header,      /* IPv6 next header number */
    int upper_len,            /* length as found in the upper layer protocol */
    const char* payload,      /* IPv6 payload */
    int len                   /* IPv6 payload length */
   );

  /* RFC 4861 -- begin */
  struct ICMPv6_RADV {
    uint8_t type;
    uint8_t code;
    char checksum[2];
    uint8_t cur_hop_limit;
    uint8_t mo_flags;
    uint16_t router_lifetime;
    uint32_t reachable_time;
    uint32_t retrans_time;
  };

  struct ICMPv6_RADV_Option {
    uint8_t type;
    uint8_t len;
  };

  struct ICMPv6_RADV_PrefixInformation {
    uint8_t type;
    uint8_t len;
    uint8_t prefix_length;
    uint8_t la_flags;
    uint32_t valid_lifetime;
    uint32_t preferred_lifetime;
    uint32_t reserved2;
    char prefix[16];
  };
  /* RFC 4861 -- end */

  void setEUI(const char* eui);         /* 64bit Extended Unique Identifier */
  void SLAAC(bool enable);              /* enable IPv6 automatic prefix configuration (listens for RADV) */
  void setGlobalAddress(const char* address); /* global IPv6 address, manually configured */
}

#endif