libnet-headers.h

Libnet is a generic networking API that provides access to several protocols. It is not designed as

#if (LIBNET_LIL_ENDIAN)
    unsigned char ip_hl:4,       /* header length */
            ip_v:4;         /* version */
#endif
#if (LIBNET_BIG_ENDIAN)
    unsigned char ip_v:4,        /* version */
           ip_hl:4;         /* header length */
#endif
    u_char ip_tos;          /* type of service */
#ifndef IPTOS_LOWDELAY
#define IPTOS_LOWDELAY      0x10
#endif
#ifndef IPTOS_THROUGHPUT
#define IPTOS_THROUGHPUT    0x08
#endif
#ifndef IPTOS_RELIABILITY
#define IPTOS_RELIABILITY   0x04
#endif
#ifndef IPTOS_LOWCOST
#define IPTOS_LOWCOST       0x02
#endif
    u_short ip_len;         /* total length */
    u_short ip_id;          /* identification */
    u_short ip_off;
#ifndef IP_RF
#define IP_RF 0x8000        /* reserved fragment flag */
#endif
#ifndef IP_DF
#define IP_DF 0x4000        /* dont fragment flag */
#endif
#ifndef IP_MF
#define IP_MF 0x2000        /* more fragments flag */
#endif 
#ifndef IP_OFFMASK
#define IP_OFFMASK 0x1fff   /* mask for fragmenting bits */
#endif
    u_char ip_ttl;          /* time to live */
    u_char ip_p;            /* protocol */
    u_short ip_sum;         /* checksum */
    struct in_addr ip_src, ip_dst; /* source and dest address */
};

/*
 *  IP options
 */
#ifndef IPOPT_EOL
#define IPOPT_EOL       0   /* end of option list */
#endif
#ifndef IPOPT_NOP
#define IPOPT_NOP       1   /* no operation */
#endif   
#ifndef IPOPT_RR
#define IPOPT_RR        7   /* record packet route */
#endif
#ifndef IPOPT_TS
#define IPOPT_TS        68  /* timestamp */
#endif
#ifndef IPOPT_SECURITY
#define IPOPT_SECURITY  130 /* provide s,c,h,tcc */   
#endif
#ifndef IPOPT_LSRR
#define IPOPT_LSRR      131 /* loose source route */
#endif
#ifndef IPOPT_SATID
#define IPOPT_SATID     136 /* satnet id */
#endif
#ifndef IPOPT_SSRR
#define IPOPT_SSRR      137 /* strict source route */
#endif

struct libnet_in6_addr
{
    union
    {
        u_char   __u6_addr8[16];
        u_short  __u6_addr16[8];
        u_long   __u6_addr32[4];
    } __u6_addr;            /* 128-bit IP6 address */
};
#define libnet_s6_addr __u6_addr.__u6_addr8
 

/*
 *  IPv6 header
 *  Internet Protocol, version 6
 *  Static header size: 40 bytes
 */
struct libnet_ipv6_hdr
{
    u_char ip_flags[4];     /* version, traffic class, flow label */
    u_short ip_len;         /* total length */
    u_char ip_nh;           /* next header */
    u_char ip_hl;           /* hop limit */
    struct libnet_in6_addr ip_src, ip_dst; /* source and dest address */

};

/*
 *  ICMP6 header
 *  Internet Control Message Protocol v6
 *  Base header size: 8 bytes
 */
#ifndef IPPROTO_ICMP6
#define IPPROTO_ICMP6   0x3a
#endif
struct libnet_icmpv6_hdr
{
    u_char icmp_type;       /* ICMP type */
#ifndef ICMP6_ECHO
#define ICMP6_ECHO          128
#endif
#ifndef ICMP6_ECHOREPLY
#define ICMP6_ECHOREPLY     129
#endif
#ifndef ICMP6_UNREACH
#define ICMP6_UNREACH       1
#endif
#ifndef ICMP6_PKTTOOBIG
#define ICMP6_PKTTOOBIG     2
#endif
#ifndef ICMP6_TIMXCEED
#define ICMP6_TIMXCEED      3
#endif
#ifndef ICMP6_PARAMPROB
#define ICMP6_PARAMPROB     4
#endif
    u_char icmp_code;       /* ICMP code */
    u_short icmp_sum;       /* ICMP Checksum */
    u_short id;             /* ICMP id */
    u_short seq;            /* ICMP sequence number */
};



/*
 *  ICMP header
 *  Internet Control Message Protocol
 *  Base header size: 4 bytes
 */
struct libnet_icmpv4_hdr
{
    u_char icmp_type;       /* ICMP type */
#ifndef     ICMP_ECHOREPLY
#define     ICMP_ECHOREPLY                  0
#endif
#ifndef     ICMP_UNREACH
#define     ICMP_UNREACH                    3
#endif
#ifndef     ICMP_SOURCEQUENCH
#define     ICMP_SOURCEQUENCH               4
#endif
#ifndef     ICMP_REDIRECT
#define     ICMP_REDIRECT                   5
#endif
#ifndef     ICMP_ECHO
#define     ICMP_ECHO                       8
#endif
#ifndef     ICMP_ROUTERADVERT
#define     ICMP_ROUTERADVERT               9
#endif
#ifndef     ICMP_ROUTERSOLICIT
#define     ICMP_ROUTERSOLICIT              10
#endif
#ifndef     ICMP_TIMXCEED
#define     ICMP_TIMXCEED                   11
#endif
#ifndef     ICMP_PARAMPROB
#define     ICMP_PARAMPROB                  12
#endif
#ifndef     ICMP_TSTAMP
#define     ICMP_TSTAMP                     13
#endif
#ifndef     ICMP_TSTAMPREPLY
#define     ICMP_TSTAMPREPLY                14
#endif
#ifndef     ICMP_IREQ
#define     ICMP_IREQ                       15
#endif
#ifndef     ICMP_IREQREPLY
#define     ICMP_IREQREPLY                  16
#endif
#ifndef     ICMP_MASKREQ
#define     ICMP_MASKREQ                    17
#endif
#ifndef     ICMP_MASKREPLY
#define     ICMP_MASKREPLY                  18
#endif
    u_char icmp_code;       /* ICMP code */
#ifndef     ICMP_UNREACH_NET
#define     ICMP_UNREACH_NET                0
#endif
#ifndef     ICMP_UNREACH_HOST
#define     ICMP_UNREACH_HOST               1
#endif
#ifndef     ICMP_UNREACH_PROTOCOL
#define     ICMP_UNREACH_PROTOCOL           2
#endif
#ifndef     ICMP_UNREACH_PORT
#define     ICMP_UNREACH_PORT               3
#endif
#ifndef     ICMP_UNREACH_NEEDFRAG
#define     ICMP_UNREACH_NEEDFRAG           4
#endif
#ifndef     ICMP_UNREACH_SRCFAIL
#define     ICMP_UNREACH_SRCFAIL            5
#endif
#ifndef     ICMP_UNREACH_NET_UNKNOWN
#define     ICMP_UNREACH_NET_UNKNOWN        6
#endif
#ifndef     ICMP_UNREACH_HOST_UNKNOWN
#define     ICMP_UNREACH_HOST_UNKNOWN       7
#endif
#ifndef     ICMP_UNREACH_ISOLATED
#define     ICMP_UNREACH_ISOLATED           8
#endif
#ifndef     ICMP_UNREACH_NET_PROHIB
#define     ICMP_UNREACH_NET_PROHIB         9
#endif
#ifndef     ICMP_UNREACH_HOST_PROHIB
#define     ICMP_UNREACH_HOST_PROHIB        10
#endif
#ifndef     ICMP_UNREACH_TOSNET
#define     ICMP_UNREACH_TOSNET             11
#endif
#ifndef     ICMP_UNREACH_TOSHOST
#define     ICMP_UNREACH_TOSHOST            12
#endif
#ifndef     ICMP_UNREACH_FILTER_PROHIB
#define     ICMP_UNREACH_FILTER_PROHIB      13
#endif
#ifndef     ICMP_UNREACH_HOST_PRECEDENCE
#define     ICMP_UNREACH_HOST_PRECEDENCE    14
#endif
#ifndef     ICMP_UNREACH_PRECEDENCE_CUTOFF
#define     ICMP_UNREACH_PRECEDENCE_CUTOFF  15
#endif
#ifndef     ICMP_REDIRECT_NET
#define     ICMP_REDIRECT_NET               0
#endif
#ifndef     ICMP_REDIRECT_HOST
#define     ICMP_REDIRECT_HOST              1
#endif
#ifndef     ICMP_REDIRECT_TOSNET
#define     ICMP_REDIRECT_TOSNET            2
#endif
#ifndef     ICMP_REDIRECT_TOSHOST
#define     ICMP_REDIRECT_TOSHOST           3
#endif
#ifndef     ICMP_TIMXCEED_INTRANS
#define     ICMP_TIMXCEED_INTRANS           0
#endif
#ifndef     ICMP_TIMXCEED_REASS
#define     ICMP_TIMXCEED_REASS             1
#endif
#ifndef     ICMP_PARAMPROB_OPTABSENT
#define     ICMP_PARAMPROB_OPTABSENT        1
#endif

    u_short icmp_sum;   /* ICMP Checksum */

    union
    {
        struct
        {
            u_short id; /* ICMP id */
            u_short seq;/* ICMP sequence number */
        } echo;

#undef icmp_id
#undef icmp_seq
#define icmp_id     hun.echo.id
#define icmp_seq    hun.echo.seq
 
        u_long gateway; /* gateway host */
        struct
        {
            u_short pad;/* padding */
            u_short mtu;/* MTU size */
        } frag;
    } hun;
    union
    {
        struct
        {
            n_time its_otime;
            n_time its_rtime;
            n_time its_ttime;
        } ts;
        struct
        {
            struct libnet_ipv4_hdr idi_ip;
            /* options and then 64 bits of data */
        } ip;
        u_long mask;
        char data[1];

#undef icmp_mask
#define icmp_mask    dun.mask
#undef icmp_data
#define icmp_data    dun.data

#undef icmp_otime
#define icmp_otime   dun.ts.its_otime
#undef icmp_rtime
#define icmp_rtime   dun.ts.its_rtime
#undef icmp_ttime
#define icmp_ttime   dun.ts.its_ttime
    }dun;
};


/*
 *  IGMP header
 *  Internet Group Message Protocol
 *  Static header size: 8 bytes
 */
struct libnet_igmp_hdr
{
    u_char igmp_type;       /* IGMP type */
#ifndef IGMP_MEMBERSHIP_QUERY
#define IGMP_MEMBERSHIP_QUERY           0x11    /* membership query */
#endif
#ifndef IGMP_V1_MEMBERSHIP_REPORT
#define IGMP_V1_MEMBERSHIP_REPORT       0x12    /* Ver. 1 membership report */
#endif
#ifndef IGMP_V2_MEMBERSHIP_REPORT
#define IGMP_V2_MEMBERSHIP_REPORT       0x16    /* Ver. 2 membership report */
#endif
#ifndef IGMP_LEAVE_GROUP
#define IGMP_LEAVE_GROUP                0x17    /* Leave-group message */
#endif
    u_char igmp_code;       /* IGMP code */
    u_short igmp_sum;       /* IGMP checksum */
    struct in_addr igmp_group;/* IGMP host IP */
};


/*
 *  IPSEC header
 *  Internet Protocol Security Protocol
 *  Encapsulating Security Payload Header Static header size: 12 bytes
 *  Encapsulating Security Payload Footer Base header size: 2 bytes
 *  Authentication Header Static Size: 16 bytes
 */
#ifndef IPPROTO_ESP
#define IPPROTO_ESP 50      /* not everyone's got this */
#endif
struct libnet_esp_hdr
{
   u_long esp_spi;          /* security parameter index */
   u_long esp_seq;          /* ESP sequence number */
   u_long esp_iv;           /* initialization vector */
};

struct libnet_esp_ftr
{
    u_char esp_pad_len;     /* padding length */
    u_char esp_nxt_hdr;     /* next header pointer */
    char *esp_auth;         /* authentication data */
};
 
#ifndef IPPROTO_AH
#define IPPROTO_AH 51       /* not everyone's got this */
#endif
struct libnet_ah_hdr
{
    u_char ah_nxt_hdr;      /* next header */
    u_char ah_len;          /* payload length */
    u_short ah_res;         /* reserved */
    u_long ah_spi;          /* security parameter index  */
    u_long ah_seq;          /* AH sequence number */
    u_long ah_auth;         /* authentication data */
};


/*
 *  ISL header
 *  Cisco Inter-Switch Link
 *  Static header size: 26 bytes
 */
/*
 *  For checksum stuff -- IANA says 135-254 is "unassigned" as of 12.2001.
 *  Let's hope this one stays that way for a while!
 */
#define LIBNET_PROTO_ISL    201
struct libnet_isl_hdr
{
    u_char isl_dhost[5];    /* destination address "01:00:0c:00:00" */
#if (LIBNET_LIL_ENDIAN)
    unsigned char  isl_type:4,    /* type of frame */
             isl_user:4;    /* user defined bits */
#endif
#if (LIBNET_BIG_ENDIAN)
    unsigned char  isl_user:4,    /* user defined bits */
             isl_type:4;    /* type of frame */
#endif
    u_char isl_shost[6];    /* source address */
    u_short isl_len;        /* total length of packet - 18 bytes */
    u_char isl_snap[6];     /* 0xaaaa03 + vendor code */
    u_short isl_vid;        /* 15 bit VLAN ID, 1 bit BPDU / CDP indicator */
    u_short isl_index;      /* port index */
    u_short isl_reserved;   /* used for FDDI and token ring */
    /* ethernet frame and 4 byte isl crc */
};

#ifndef IPPROTO_OSPF
#define IPPROTO_OSPF    89  /* not everyone's got this */
#endif
#define IPPROTO_OSPF_LSA    890     /* made this up.  Hope it's unused */
#define LIBNET_MODX         4102    /* used in LSA checksum */

/*
 *  Options used in multiple OSPF packets
 *  More info can be found in section A.2 of RFC 2328.
 */
#define LIBNET_OPT_EBIT  0x02 /* describes the way AS-external-LSAs are flooded */
#define LIBNET_OPT_MCBIT 0x04 /* whether or not IP multicast dgrams are fwdd */
#define LIBNET_OPT_NPBIT 0x08 /* describes handling of type-7 LSAs */
#define LIBNET_OPT_EABIT 0x10 /* rtr's willingness to send/recv EA-LSAs */