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/*
 * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
 */
#define OSPF_TYPE_UMD           0       /* UMd's special monitoring packets */
#define OSPF_TYPE_HELLO         1       /* Hello */
#define OSPF_TYPE_DD            2       /* Database Description */
#define OSPF_TYPE_LS_REQ        3       /* Link State Request */
#define OSPF_TYPE_LS_UPDATE     4       /* Link State Update */
#define OSPF_TYPE_LS_ACK        5       /* Link State Ack */

/* Options field
 *
 * +------------------------------------+
 * | DN | O | DC | L | N/P | MC | E | T |
 * +------------------------------------+
 *
 */

#define OSPF_OPTION_T   0x01    /* T bit: TOS support   */
#define OSPF_OPTION_E   0x02    /* E bit: External routes advertised    */
#define OSPF_OPTION_MC  0x04    /* MC bit: Multicast capable */
#define OSPF_OPTION_NP  0x08    /* N/P bit: NSSA capable */
#define OSPF_OPTION_EA  0x10    /* EA bit: External Attribute capable */
#define OSPF_OPTION_L   0x10    /* L bit: Packet contains LLS data block */
#define OSPF_OPTION_DC  0x20    /* DC bit: Demand circuit capable */
#define OSPF_OPTION_O   0x40    /* O bit: Opaque LSA capable */
#define OSPF_OPTION_DN  0x80    /* DN bit: Up/Down Bit capable - draft-ietf-ospf-2547-dnbit-04 */

/* ospf_authtype        */
#define OSPF_AUTH_NONE          0        /* No auth-data */
#define OSPF_AUTH_SIMPLE        1       /* Simple password */
#define OSPF_AUTH_SIMPLE_LEN    8       /* max length of simple authentication */
#define OSPF_AUTH_MD5           2       /* MD5 authentication */
#define OSPF_AUTH_MD5_LEN       16      /* length of MD5 authentication */

/* db_flags     */
#define OSPF_DB_INIT            0x04
#define OSPF_DB_MORE            0x02
#define OSPF_DB_MASTER          0x01
#define OSPF_DB_RESYNC          0x08  /* RFC4811 */

/* ls_type      */
#define LS_TYPE_ROUTER          1   /* router link */
#define LS_TYPE_NETWORK         2   /* network link */
#define LS_TYPE_SUM_IP          3   /* summary link */
#define LS_TYPE_SUM_ABR         4   /* summary area link */
#define LS_TYPE_ASE             5   /* ASE  */
#define LS_TYPE_GROUP           6   /* Group membership (multicast */
                                    /* extensions 23 July 1991) */
#define LS_TYPE_NSSA            7   /* rfc3101 - Not so Stubby Areas */
#define LS_TYPE_OPAQUE_LL       9   /* rfc2370 - Opaque Link Local */
#define LS_TYPE_OPAQUE_AL      10   /* rfc2370 - Opaque Link Local */
#define LS_TYPE_OPAQUE_DW      11   /* rfc2370 - Opaque Domain Wide */

#define LS_OPAQUE_TYPE_TE       1   /* rfc3630 */
#define LS_OPAQUE_TYPE_GRACE    3   /* rfc3623 */
#define LS_OPAQUE_TYPE_RI       4   /* draft-ietf-ospf-cap-03 */

#define LS_OPAQUE_TE_TLV_ROUTER 1   /* rfc3630 */
#define LS_OPAQUE_TE_TLV_LINK   2   /* rfc3630 */

#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE             1 /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID               2 /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP              3 /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP             4 /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC             5 /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW                6 /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW            7 /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW              8 /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP           9 /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID 11 /* rfc4203 */
#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE 14 /* rfc4203 */
#define LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR    15 /* rfc4203 */
#define LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP    16 /* rfc4203 */
#define LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS       17 /* rfc4124 */

#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP        1  /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA         2  /* rfc3630 */

#define LS_OPAQUE_GRACE_TLV_PERIOD       1 /* rfc3623 */
#define LS_OPAQUE_GRACE_TLV_REASON       2 /* rfc3623 */
#define LS_OPAQUE_GRACE_TLV_INT_ADDRESS  3 /* rfc3623 */

#define LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN     0 /* rfc3623 */
#define LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART  1 /* rfc3623 */
#define LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE  2 /* rfc3623 */
#define LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH   3 /* rfc3623 */

#define LS_OPAQUE_RI_TLV_CAP             1 /* draft-ietf-ospf-cap-03 */


/* rla_link.link_type   */
#define RLA_TYPE_ROUTER         1   /* point-to-point to another router */
#define RLA_TYPE_TRANSIT        2   /* connection to transit network    */
#define RLA_TYPE_STUB           3   /* connection to stub network       */
#define RLA_TYPE_VIRTUAL        4   /* virtual link                     */

/* rla_flags    */
#define RLA_FLAG_B      0x01
#define RLA_FLAG_E      0x02
#define RLA_FLAG_W1     0x04
#define RLA_FLAG_W2     0x08

/* sla_tosmetric breakdown      */
#define SLA_MASK_TOS            0x7f000000
#define SLA_MASK_METRIC         0x00ffffff
#define SLA_SHIFT_TOS           24

/* asla_tosmetric breakdown     */
#define ASLA_FLAG_EXTERNAL      0x80000000
#define ASLA_MASK_TOS           0x7f000000
#define ASLA_SHIFT_TOS          24
#define ASLA_MASK_METRIC        0x00ffffff

/* multicast vertex type */
#define MCLA_VERTEX_ROUTER      1
#define MCLA_VERTEX_NETWORK     2

/* Link-Local-Signaling */
#define OSPF_LLS_HDRLEN         4U /* RFC5613 Section 2.2 */

#define OSPF_LLS_EO             1  /* RFC4811, RFC4812 */
#define OSPF_LLS_MD5            2  /* RFC4813 */

#define OSPF_LLS_EO_LR          0x00000001              /* RFC4811 */
#define OSPF_LLS_EO_RS          0x00000002              /* RFC4812 */

/*
 * TOS metric struct (will be 0 or more in router links update)
 */
struct tos_metric {
    uint8_t tos_type;
    uint8_t reserved;
    uint8_t tos_metric[2];
};
struct tos_link {
    uint8_t link_type;
    uint8_t link_tos_count;
    uint8_t tos_metric[2];
};
union un_tos {
    struct tos_link link;
    struct tos_metric metrics;
};

/* link state advertisement header */
struct lsa_hdr {
    uint16_t ls_age;
    uint8_t ls_options;
    uint8_t ls_type;
    union {
        struct in_addr lsa_id;
        struct { /* opaque LSAs change the LSA-ID field */
            uint8_t opaque_type;
            uint8_t opaque_id[3];
        } opaque_field;
    } un_lsa_id;
    struct in_addr ls_router;
    uint32_t ls_seq;
    uint16_t ls_chksum;
    uint16_t ls_length;
};

/* link state advertisement */
struct lsa {
    struct lsa_hdr ls_hdr;

    /* Link state types */
    union {
        /* Router links advertisements */
        struct {
            uint8_t rla_flags;
            uint8_t rla_zero[1];
            uint16_t rla_count;
            struct rlalink {
                struct in_addr link_id;
                struct in_addr link_data;
                union un_tos un_tos;
            } rla_link[1];              /* may repeat   */
        } un_rla;

        /* Network links advertisements */
        struct {
            struct in_addr nla_mask;
            struct in_addr nla_router[1];       /* may repeat   */
        } un_nla;

        /* Summary links advertisements */
        struct {
            struct in_addr sla_mask;
            uint32_t sla_tosmetric[1];  /* may repeat   */
        } un_sla;

        /* AS external links advertisements */
        struct {
            struct in_addr asla_mask;
            struct aslametric {
                uint32_t asla_tosmetric;
                struct in_addr asla_forward;
                struct in_addr asla_tag;
            } asla_metric[1];           /* may repeat   */
        } un_asla;

        /* Multicast group membership */
        struct mcla {
            uint32_t mcla_vtype;
            struct in_addr mcla_vid;
        } un_mcla[1];

        /* Opaque TE LSA */
        struct {
            uint16_t type;
            uint16_t length;
            uint8_t data[1]; /* may repeat   */
        } un_te_lsa_tlv;

        /* Opaque Grace LSA */
        struct {
            uint16_t type;
            uint16_t length;
            uint8_t data[1]; /* may repeat   */
        } un_grace_tlv;

        /* Opaque Router information LSA */
        struct {
            uint16_t type;
            uint16_t length;
            uint8_t data[1]; /* may repeat   */
        } un_ri_tlv;

        /* Unknown LSA */
        struct unknown {
            uint8_t data[1]; /* may repeat   */
        } un_unknown[1];

    } lsa_un;
};

#define OSPF_AUTH_SIZE  8

/*
 * the main header
 */
struct ospfhdr {
    uint8_t ospf_version;
    uint8_t ospf_type;
    uint16_t ospf_len;
    struct in_addr ospf_routerid;
    struct in_addr ospf_areaid;
    uint16_t ospf_chksum;
    uint16_t ospf_authtype;
    uint8_t ospf_authdata[OSPF_AUTH_SIZE];
    union {

        /* Hello packet */
        struct {
            struct in_addr hello_mask;
            uint16_t hello_helloint;
            uint8_t hello_options;
            uint8_t hello_priority;
            uint32_t hello_deadint;
            struct in_addr hello_dr;
            struct in_addr hello_bdr;
            struct in_addr hello_neighbor[1]; /* may repeat     */
        } un_hello;

        /* Database Description packet */
        struct {
            uint16_t db_ifmtu;
            uint8_t db_options;
            uint8_t db_flags;
            uint32_t db_seq;
            struct lsa_hdr db_lshdr[1]; /* may repeat   */
        } un_db;

        /* Link State Request */
        struct lsr {
            uint8_t ls_type[4];
            union {
                struct in_addr ls_stateid;
                struct { /* opaque LSAs change the LSA-ID field */
                    uint8_t opaque_type;
                    uint8_t opaque_id[3];
                } opaque_field;
            } un_ls_stateid;
            struct in_addr ls_router;
        } un_lsr[1];            /* may repeat   */

        /* Link State Update */
        struct {
            uint32_t lsu_count;
            struct lsa lsu_lsa[1]; /* may repeat        */
        } un_lsu;

        /* Link State Acknowledgement */
        struct {
            struct lsa_hdr lsa_lshdr[1]; /* may repeat  */
        } un_lsa ;
    } ospf_un ;
};

#define ospf_hello      ospf_un.un_hello
#define ospf_db         ospf_un.un_db
#define ospf_lsr        ospf_un.un_lsr
#define ospf_lsu        ospf_un.un_lsu
#define ospf_lsa        ospf_un.un_lsa