/*
 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 *
 */

#ifndef _NET_BATMAN_ADV_PACKET_H_
#define _NET_BATMAN_ADV_PACKET_H_

#define ETH_P_BATMAN  0x4305    /* unofficial/not registered Ethertype */

enum bat_packettype {
        BAT_PACKET       = 0x01,
        BAT_ICMP         = 0x02,
        BAT_UNICAST      = 0x03,
        BAT_BCAST        = 0x04,
        BAT_VIS          = 0x05,
        BAT_UNICAST_FRAG = 0x06,
        BAT_TT_QUERY     = 0x07,
        BAT_ROAM_ADV     = 0x08
};

/* this file is included by batctl which needs these defines */
#define COMPAT_VERSION 14

enum batman_flags {
        PRIMARIES_FIRST_HOP = 1 << 4,
        VIS_SERVER          = 1 << 5,
        DIRECTLINK          = 1 << 6
};

/* ICMP message types */
enum icmp_packettype {
        ECHO_REPLY              = 0,
        DESTINATION_UNREACHABLE = 3,
        ECHO_REQUEST            = 8,
        TTL_EXCEEDED            = 11,
        PARAMETER_PROBLEM       = 12
};

/* vis defines */
enum vis_packettype {
        VIS_TYPE_SERVER_SYNC   = 0,
        VIS_TYPE_CLIENT_UPDATE = 1
};

/* fragmentation defines */
enum unicast_frag_flags {
        UNI_FRAG_HEAD      = 1 << 0,
        UNI_FRAG_LARGETAIL = 1 << 1
};

/* TT_QUERY subtypes */
#define TT_QUERY_TYPE_MASK 0x3

enum tt_query_packettype {
        TT_REQUEST    = 0,
        TT_RESPONSE   = 1
};

/* TT_QUERY flags */
enum tt_query_flags {
        TT_FULL_TABLE = 1 << 2
};

/* TT_CLIENT flags.
 * Flags from 1 to 1 << 7 are sent on the wire, while flags from 1 << 8 to
 * 1 << 15 are used for local computation only */
enum tt_client_flags {
        TT_CLIENT_DEL     = 1 << 0,
        TT_CLIENT_ROAM    = 1 << 1,
        TT_CLIENT_NOPURGE = 1 << 8,
        TT_CLIENT_NEW     = 1 << 9,
        TT_CLIENT_PENDING = 1 << 10
};

struct batman_packet {
        uint8_t  packet_type;
        uint8_t  version;  /* batman version field */
        uint8_t  ttl;
        uint8_t  flags;    /* 0x40: DIRECTLINK flag, 0x20 VIS_SERVER flag... */
        uint32_t seqno;
        uint8_t  orig[6];
        uint8_t  prev_sender[6];
        uint8_t  gw_flags;  /* flags related to gateway class */
        uint8_t  tq;
        uint8_t  tt_num_changes;
        uint8_t  ttvn; /* translation table version number */
        uint16_t tt_crc;
} __packed;

#define BAT_PACKET_LEN sizeof(struct batman_packet)

struct icmp_packet {
        uint8_t  packet_type;
        uint8_t  version;  /* batman version field */
        uint8_t  ttl;
        uint8_t  msg_type; /* see ICMP message types above */
        uint8_t  dst[6];
        uint8_t  orig[6];
        uint16_t seqno;
        uint8_t  uid;
        uint8_t  reserved;
} __packed;

#define BAT_RR_LEN 16

/* icmp_packet_rr must start with all fields from imcp_packet
 * as this is assumed by code that handles ICMP packets */
struct icmp_packet_rr {
        uint8_t  packet_type;
        uint8_t  version;  /* batman version field */
        uint8_t  ttl;
        uint8_t  msg_type; /* see ICMP message types above */
        uint8_t  dst[6];
        uint8_t  orig[6];
        uint16_t seqno;
        uint8_t  uid;
        uint8_t  rr_cur;
        uint8_t  rr[BAT_RR_LEN][ETH_ALEN];
} __packed;

struct unicast_packet {
        uint8_t  packet_type;
        uint8_t  version;  /* batman version field */
        uint8_t  ttl;
        uint8_t  ttvn; /* destination translation table version number */
        uint8_t  dest[6];
} __packed;

struct unicast_frag_packet {
        uint8_t  packet_type;
        uint8_t  version;  /* batman version field */
        uint8_t  ttl;
        uint8_t  ttvn; /* destination translation table version number */
        uint8_t  dest[6];
        uint8_t  flags;
        uint8_t  align;
        uint8_t  orig[6];
        uint16_t seqno;
} __packed;

struct bcast_packet {
        uint8_t  packet_type;
        uint8_t  version;  /* batman version field */
        uint8_t  ttl;
        uint8_t  reserved;
        uint32_t seqno;
        uint8_t  orig[6];
} __packed;

struct vis_packet {
        uint8_t  packet_type;
        uint8_t  version;        /* batman version field */
        uint8_t  ttl;            /* TTL */
        uint8_t  vis_type;       /* which type of vis-participant sent this? */
        uint32_t seqno;          /* sequence number */
        uint8_t  entries;        /* number of entries behind this struct */
        uint8_t  reserved;
        uint8_t  vis_orig[6];    /* originator that announces its neighbors */
        uint8_t  target_orig[6]; /* who should receive this packet */
        uint8_t  sender_orig[6]; /* who sent or rebroadcasted this packet */
} __packed;

struct tt_query_packet {
        uint8_t  packet_type;
        uint8_t  version;  /* batman version field */
        uint8_t  ttl;
        /* the flag field is a combination of:
         * - TT_REQUEST or TT_RESPONSE
         * - TT_FULL_TABLE */
        uint8_t  flags;
        uint8_t  dst[ETH_ALEN];
        uint8_t  src[ETH_ALEN];
        /* the ttvn field is:
         * if TT_REQUEST: ttvn that triggered the
         *                request
         * if TT_RESPONSE: new ttvn for the src
         *                 orig_node */
        uint8_t  ttvn;
        /* tt_data field is:
         * if TT_REQUEST: crc associated with the
         *                ttvn
         * if TT_RESPONSE: table_size */
        uint16_t tt_data;
} __packed;

struct roam_adv_packet {
        uint8_t  packet_type;
        uint8_t  version;
        uint8_t  ttl;
        uint8_t  reserved;
        uint8_t  dst[ETH_ALEN];
        uint8_t  src[ETH_ALEN];
        uint8_t  client[ETH_ALEN];
} __packed;

struct tt_change {
        uint8_t flags;
        uint8_t addr[ETH_ALEN];
} __packed;

#endif /* _NET_BATMAN_ADV_PACKET_H_ */