/*
 * IS-IS Rout(e)ing protocol - isis_tlv.h
 *                             IS-IS TLV related routines
 *
 * Copyright (C) 2001,2002   Sampo Saaristo
 *                           Tampere University of Technology      
 *                           Institute of Communications Engineering
 *
 * This program is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU General Public Licenseas published by the Free 
 * Software Foundation; either version 2 of the License, or (at your option) 
 * any later version.
 *
 * 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., 
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifndef _ZEBRA_ISIS_TLV_H
#define _ZEBRA_ISIS_TLV_H

/*
 * Structures found in TLV's.
 * this header is fully complient with
 * draft-ietf-isis-wg-tlv-codepoints-02.txt
 1.  TLV Codepoints reserved
     ____________________________________________________
     Name                 Value   IIH   LSP  SNP   Status
     ____________________________________________________

     Area Addresses            1  y     y    n  ISO 10589
     IIS Neighbors             2  n     y    n  ISO 10589
     ES Neighbors              3  n     y    n  ISO 10589
     Part. DIS                 4  n     y    n  ISO 10589
     Prefix Neighbors          5  n     y    n  ISO 10589
     IIS Neighbors             6  y     n    n  ISO 10589
     Padding                   8  y     n    n  ISO 10589
     LSP Entries               9  n     n    y  ISO 10589
     Authentication           10  y     y    y  ISO 10589
     Opt. Checksum            12  y     n    y  IETF-draft
     LSPBufferSize            14  n     y    n  ISO 10589 Rev 2 Draft
     TE IIS Neigh.            22  n     y    n  IETF-draft
     DECnet Phase IV          42  y     n    n  DEC (ancient)
     IP Int. Reach           128  n     y    n  RFC 1195
     Prot. Supported         129  y     y    n  RFC 1195
     IP Ext. Address         130  n     y    n  RFC 1195
     IDRPI                   131  n     y    y  RFC 1195
     IP Intf. Address        132  y     y    n  RFC 1195
     Illegal                 133  n     n    n  RFC 1195 (not used)
     Router ID               134  n     y    n  IETF-draft
     TE IP. Reach            135  n     y    n  IETF-draft
     Dynamic Name            137  n     y    n  RFC 2763
     Nortel Proprietary      176  n     y    n
     Nortel Proprietary      177  n     y    n
     Restart TLV             211  y     n    n  IETF-draft
     MT-ISN                  222  n     y    n  IETF-draft
     M-Topologies            229  y     y    n  IETF-draft
     IPv6 Intf. Addr.        232  y     y    n  IETF-draft
     MT IP. Reach            235  n     y    n  IETF-draft
     IPv6 IP. Reach          236  n     y    n  IETF-draft
     MT IPv6 IP. Reach       237  n     y    n  IETF-draft
     P2P Adjacency State     240  y     n    n  IETF-draft

 */

#define AREA_ADDRESSES            1
#define IS_NEIGHBOURS             2
#define ES_NEIGHBOURS             3
#define PARTITION_DESIG_LEVEL2_IS 4
#define PREFIX_NEIGHBOURS         5
#define LAN_NEIGHBOURS            6
#define PADDING                   8
#define LSP_ENTRIES               9
#define AUTH_INFO                 10
#define CHECKSUM                  12
#define TE_IS_NEIGHBOURS          22
#define IPV4_INT_REACHABILITY     128
#define IPV4_EXT_REACHABILITY     130
#define PROTOCOLS_SUPPORTED       129
#define IDRP_INFO                 131
#define IPV4_ADDR                 132
#define TE_ROUTER_ID              134
#define TE_IPV4_REACHABILITY      135
#define DYNAMIC_HOSTNAME          137
#define IPV6_REACHABILITY         236
#define IPV6_ADDR                 232
#define WAY3_HELLO                240

#define IS_NEIGHBOURS_LEN (ISIS_SYS_ID_LEN + 5)
#define LAN_NEIGHBOURS_LEN 6
#define LSP_ENTRIES_LEN (10 + ISIS_SYS_ID_LEN) /* FIXME: should be entry */
#define IPV4_REACH_LEN 12
#define IPV6_REACH_LEN 22

/* struct for neighbor */
struct is_neigh{
  struct metric                        metrics;
  u_char         neigh_id[ISIS_SYS_ID_LEN + 1];
};

/* struct for te is neighbor */
struct te_is_neigh{
  u_char         neigh_id[ISIS_SYS_ID_LEN + 1];
  u_char                          te_metric[3];
  u_char                       sub_tlvs_length;
};

/* struct for es neighbors */
struct es_neigh{
  struct metric                        metrics;
  /* approximate position of first, we use the
   * length ((uchar*)metric-1) to know all     */
  u_char       first_es_neigh[ISIS_SYS_ID_LEN]; 
                                                 
};

struct partition_desig_level2_is{
  struct list                 *isis_system_ids;
};

/* struct for lan neighbors */
struct lan_neigh{
  u_char             LAN_addr[6];
};

/* struct for LSP entry */
struct lsp_entry {
  u_int16_t                  rem_lifetime;
  u_char      lsp_id[ISIS_SYS_ID_LEN + 2];
  u_int32_t                       seq_num;
  u_int16_t                      checksum;
} __attribute__((packed));

/* struct for checksum */
struct checksum {
  u_int16_t checksum;
};

/* ipv4 reachability */
struct ipv4_reachability {
  struct metric metrics;
  struct in_addr prefix;
  struct in_addr   mask;
};

/* te router id */
struct te_router_id {
  struct in_addr     id;
};

/* te ipv4 reachability */
struct te_ipv4_reachability {
  u_int32_t    te_metric;
  u_char         control;
  u_char    prefix_start; /* since this is variable length by nature it only */
};			  /* points to an approximate location */ 


struct idrp_info {
  u_char len;
  u_char *value;
};

#ifdef HAVE_IPV6
struct ipv6_reachability {
  u_int32_t          metric;
  u_char             control_info; 
  u_char             prefix_len;
  u_char             prefix[16];
};
#endif /* HAVE_IPV6 */

/* bits in control_info */
#define CTRL_INFO_DIRECTION    0x80
#define DIRECTION_UP           0
#define DIRECTION_DOWN         1
#define CTRL_INFO_DISTRIBUTION 0x40
#define DISTRIBUTION_INTERNAL  0
#define DISTRIBUTION_EXTERNAL  1
#define CTRL_INFO_SUBTLVS      0x20

/*
 * Pointer to each tlv type, filled by parse_tlvs()
 */
struct tlvs {
  struct list                           *area_addrs;
  struct list                            *is_neighs;
  struct list                         *te_is_neighs;
  struct list                            *es_neighs;
  struct list                          *lsp_entries;
  struct list                        *prefix_neighs;
  struct list                           *lan_neighs;
  struct checksum                         *checksum;
  struct nlpids                             *nlpids;
  struct list                           *ipv4_addrs;
  struct list                      *ipv4_int_reachs;
  struct list                      *ipv4_ext_reachs;
  struct list                       *te_ipv4_reachs;
  struct hostname                         *hostname;
  struct te_router_id                    *router_id;
#ifdef HAVE_IPV6
  struct list                           *ipv6_addrs;
  struct list                          *ipv6_reachs;
#endif
  struct isis_passwd                      auth_info;
};

/*
 * Own definitions - used to bitmask found and expected
 */

#define TLVFLAG_AREA_ADDRS                (1<<0)
#define TLVFLAG_IS_NEIGHS                 (1<<1)
#define TLVFLAG_ES_NEIGHS                 (1<<2)
#define TLVFLAG_PARTITION_DESIG_LEVEL2_IS (1<<3)
#define TLVFLAG_PREFIX_NEIGHS             (1<<4)
#define TLVFLAG_LAN_NEIGHS                (1<<5)
#define TLVFLAG_LSP_ENTRIES               (1<<6)
#define TLVFLAG_PADDING                   (1<<7)
#define TLVFLAG_AUTH_INFO                 (1<<8)
#define TLVFLAG_IPV4_INT_REACHABILITY     (1<<9)
#define TLVFLAG_NLPID                     (1<<10)
#define TLVFLAG_IPV4_EXT_REACHABILITY     (1<<11)
#define TLVFLAG_IPV4_ADDR                 (1<<12)
#define TLVFLAG_DYN_HOSTNAME              (1<<13)
#define TLVFLAG_IPV6_ADDR                 (1<<14)
#define TLVFLAG_IPV6_REACHABILITY         (1<<15)
#define TLVFLAG_TE_IS_NEIGHS              (1<<16)
#define TLVFLAG_TE_IPV4_REACHABILITY      (1<<17)
#define TLVFLAG_3WAY_HELLO                (1<<18)
#define TLVFLAG_TE_ROUTER_ID              (1<<19)
#define TLVFLAG_CHECKSUM                  (1<<20)

void init_tlvs  (struct tlvs *tlvs, uint32_t expected);
void free_tlvs  (struct tlvs *tlvs);
int  parse_tlvs (char *areatag, u_char *stream, int size, u_int32_t *expected, 
                 u_int32_t *found, struct tlvs *tlvs);
void free_tlv   (void *val);

int tlv_add_area_addrs       (struct list *area_addrs, struct stream *stream);
int tlv_add_is_neighs        (struct list *is_neighs, struct stream *stream);
int tlv_add_lan_neighs       (struct list *lan_neighs, struct stream *stream);
int tlv_add_nlpid            (struct nlpids *nlpids, struct stream *stream);
int tlv_add_checksum         (struct checksum *checksum, 
			      struct stream *stream);
int tlv_add_authinfo         (char auth_type, char authlen, char *auth_value,
			      struct stream *stream);
int tlv_add_ip_addrs         (struct list *ip_addrs, struct stream *stream);
int tlv_add_dynamic_hostname (struct hostname *hostname,struct stream *stream);
int tlv_add_lsp_entries      (struct list *lsps, struct stream *stream);
int tlv_add_ipv4_reachs      (struct list *ipv4_reachs, struct stream *stream);
#ifdef HAVE_IPV6
int tlv_add_ipv6_addrs       (struct list *ipv6_addrs, struct stream *stream);
int tlv_add_ipv6_reachs      (struct list *ipv6_reachs, struct stream *stream);
#endif /* HAVE_IPV6 */

int tlv_add_padding          (struct stream *stream);

#endif /* _ZEBRA_ISIS_TLV_H */