/***************************************************************************
 * RoutingHeader.h -- The RoutingHeader Class represents an IPv6 Routing   *
 * extension header.                                                       *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
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 ***************************************************************************/
/* This code was originally part of the Nping tool.                        */

#ifndef __ROUTING_HEADER_H__
#define __ROUTING_HEADER_H__ 1

#include "IPv6ExtensionHeader.h"

#define ROUTING_HEADER_MIN_LEN 8
#define ROUTING_HEADER_MAX_LEN (8 + 256*8)
#define ROUTING_MAX_DATA_LEN 256*8
#define ROUTING_TYPE_2_HEADER_LEN 24
#define ROUTING_TYPE_0_MIN_LEN 8

class RoutingHeader : public IPv6ExtensionHeader {

    private:

     /*
      1) Generic Routing Header:

        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |  Next Header  |  Hdr Ext Len  |  Routing Type | Segments Left |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |                                                               |
        .                                                               .
        .                       type-specific data                      .
        .                                                               .
        |                                                               |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      2) Type 0 Routing header:

        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |  Next Header  |  Hdr Ext Len  | Routing Type=0| Segments Left |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |                            Reserved                           |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |                                                               |
        +                                                               +
        |                                                               |
        +                           Address[1]                          +
        |                                                               |
        +                                                               +
        |                                                               |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |                                                               |
        +                                                               +
        |                                                               |
        +                           Address[2]                          +
        |                                                               |
        +                                                               +
        |                                                               |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        .                               .                               .
        .                               .                               .
        .                               .                               .
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |                                                               |
        +                                                               +
        |                                                               |
        +                           Address[n]                          +
        |                                                               |
        +                                                               +
        |                                                               |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      3) Type 2 Routing header:

       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Next Header  | Hdr Ext Len=2 | Routing Type=2|Segments Left=1|
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                            Reserved                           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       +                                                               +
       |                                                               |
       +                         Home Address                          +
       |                                                               |
       +                                                               +
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
        struct nping_ipv6_ext_routing_hdr{
            u8 nh;
            u8 len;
            u8 type;
            u8 segleft;
            u32 reserved;
            u8 data[ROUTING_MAX_DATA_LEN];
        }__attribute__((__packed__));
        typedef struct nping_ipv6_ext_routing_hdr nping_ipv6_ext_routing_hdr_t;

        nping_ipv6_ext_routing_hdr_t h;
        u8 *curr_addr;

    public:
        RoutingHeader();
        ~RoutingHeader();
        void reset();
        u8 *getBufferPointer();
        int storeRecvData(const u8 *buf, size_t len);
        int protocol_id() const;
        int validate();
        int print(FILE *output, int detail) const;

        /* Protocol specific methods */
        int setNextHeader(u8 val);
        u8 getNextHeader();

        int setRoutingType(u8 val);
        u8 getRoutingType();

        int setSegmentsLeft(u8 val);
        u8 getSegmentsLeft();

        int addAddress(struct in6_addr val);

}; /* End of class RoutingHeader */

#endif
