isisd/isis_tlv.h

   1 /*
   2  * IS-IS Rout(e)ing protocol - isis_tlv.h
   3  *                             IS-IS TLV related routines
   4  *
   5  * Copyright (C) 2001,2002   Sampo Saaristo
   6  *                           Tampere University of Technology
   7  *                           Institute of Communications Engineering
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public Licenseas published by the Free
  11  * Software Foundation; either version 2 of the License, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22  */
  23
  24 #ifndef _ZEBRA_ISIS_TLV_H
  25 #define _ZEBRA_ISIS_TLV_H
  26
  27 /*
  28  * The list of TLVs we (should) support.
  29  * ____________________________________________________________________________
  30  * Name                   Value  IIH LSP SNP Status
  31  *                               LAN
  32  * ____________________________________________________________________________
  33  *
  34  * Area Addresses             1   y   y   n  ISO10589
  35  * IIS Neighbors              2   n   y   n  ISO10589
  36  * ES Neighbors               3   n   y   n  ISO10589
  37  * IIS Neighbors              6   y   n   n  ISO10589
  38  * Padding                    8   y   n   n  ISO10589
  39  * LSP Entries                9   n   n   y  ISO10589
  40  * Authentication            10   y   y   y  ISO10589, RFC3567
  41  * Checksum                  12   y   n   y  RFC3358
  42  * TE IS Reachability        22   n   y   n  RFC3784
  43  * IS Alias                  24   n   y   n  RFC3786
  44  * IP Int. Reachability     128   n   y   n  RFC1195
  45  * Protocols Supported      129   y   y   n  RFC1195
  46  * IP Ext. Reachability     130   n   y   n  RFC1195
  47  * IDRPI                    131   n   y   y  RFC1195
  48  * IP Interface Address     132   y   y   n  RFC1195
  49  * TE Router ID             134   n   y   n  RFC3784
  50  * Extended IP Reachability 135   n   y   n  RFC3784
  51  * Dynamic Hostname         137   n   y   n  RFC2763
  52  * Shared Risk Link Group   138   n   y   y  draft-ietf-isis-gmpls-extensions
  53  * Restart TLV              211   y   n   n  RFC3847
  54  * MT IS Reachability       222   n   y   n  draft-ietf-isis-wg-multi-topology
  55  * MT Supported             229   y   y   n  draft-ietf-isis-wg-multi-topology
  56  * IPv6 Interface Address   232   y   y   n  draft-ietf-isis_ipv6
  57  * MT IP Reachability       235   n   y   n  draft-ietf-isis-wg-multi-topology
  58  * IPv6 IP Reachability     236   n   y   n  draft-ietf-isis_ipv6
  59  * MT IPv6 IP Reachability  237   n   y   n  draft-ietf-isis-wg-multi-topology
  60  * P2P Adjacency State      240   y   n   n  RFC3373
  61  * IIH Sequence Number      241   y   n   n  draft-shen-isis-iih-sequence
  62  * Router Capability        242   -   -   -  draft-ietf-isis-caps
  63  *
  64  *
  65  * IS Reachability sub-TLVs we (should) support.
  66  * ____________________________________________________________________________
  67  * Name                           Value   Status
  68  * ____________________________________________________________________________
  69  * Administartive group (color)       3   RFC3784
  70  * Link Local/Remote Identifiers      4   draft-ietf-isis-gmpls-extensions
  71  * IPv4 interface address             6   RFC3784
  72  * IPv4 neighbor address              8   RFC3784
  73  * Maximum link bandwidth             9   RFC3784
  74  * Reservable link bandwidth         10   RFC3784
  75  * Unreserved bandwidth              11   RFC3784
  76  * TE Default metric                 18   RFC3784
  77  * Link Protection Type              20   draft-ietf-isis-gmpls-extensions
  78  * Interface Switching Capability    21   draft-ietf-isis-gmpls-extensions
  79  *
  80  *
  81  * IP Reachability sub-TLVs we (should) support.
  82  * ____________________________________________________________________________
  83  * Name                           Value   Status
  84  * ____________________________________________________________________________
  85  * 32bit administrative tag           1   draft-ietf-isis-admin-tags
  86  * 64bit administrative tag           2   draft-ietf-isis-admin-tags
  87  * Management prefix color          117   draft-ietf-isis-wg-multi-topology
  88  */
  89
  90 #define AREA_ADDRESSES            1
  91 #define IS_NEIGHBOURS             2
  92 #define ES_NEIGHBOURS             3
  93 #define LAN_NEIGHBOURS            6
  94 #define PADDING                   8
  95 #define LSP_ENTRIES               9
  96 #define AUTH_INFO                 10
  97 #define CHECKSUM                  12
  98 #define TE_IS_NEIGHBOURS          22
  99 #define IS_ALIAS                  24
 100 #define IPV4_INT_REACHABILITY     128
 101 #define PROTOCOLS_SUPPORTED       129
 102 #define IPV4_EXT_REACHABILITY     130
 103 #define IDRP_INFO                 131
 104 #define IPV4_ADDR                 132
 105 #define TE_ROUTER_ID              134
 106 #define TE_IPV4_REACHABILITY      135
 107 #define DYNAMIC_HOSTNAME          137
 108 #define GRACEFUL_RESTART          211
 109 #define IPV6_ADDR                 232
 110 #define IPV6_REACHABILITY         236
 111 #define WAY3_HELLO                240
 112
 113 #define IS_NEIGHBOURS_LEN (ISIS_SYS_ID_LEN + 5)
 114 #define LAN_NEIGHBOURS_LEN 6
 115 #define LSP_ENTRIES_LEN (10 + ISIS_SYS_ID_LEN)  /* FIXME: should be entry */
 116 #define IPV4_REACH_LEN 12
 117 #define IPV6_REACH_LEN 22
 118
 119 /* struct for neighbor */
 120 struct is_neigh
 121 {
 122   struct metric metrics;
 123   u_char neigh_id[ISIS_SYS_ID_LEN + 1];
 124 };
 125
 126 /* struct for te is neighbor */
 127 struct te_is_neigh
 128 {
 129   u_char neigh_id[ISIS_SYS_ID_LEN + 1];
 130   u_char te_metric[3];
 131   u_char sub_tlvs_length;
 132 };
 133
 134 /* struct for es neighbors */
 135 struct es_neigh
 136 {
 137   struct metric metrics;
 138   /* approximate position of first, we use the
 139    * length ((uchar*)metric-1) to know all     */
 140   u_char first_es_neigh[ISIS_SYS_ID_LEN];
 141
 142 };
 143
 144 struct partition_desig_level2_is
 145 {
 146   struct list *isis_system_ids;
 147 };
 148
 149 /* struct for lan neighbors */
 150 struct lan_neigh
 151 {
 152   u_char LAN_addr[6];
 153 };
 154
 155 /* struct for LSP entry */
 156 struct lsp_entry
 157 {
 158   u_int16_t rem_lifetime;
 159   u_char lsp_id[ISIS_SYS_ID_LEN + 2];
 160   u_int32_t seq_num;
 161   u_int16_t checksum;
 162 } __attribute__ ((packed));
 163
 164 /* struct for checksum */
 165 struct checksum
 166 {
 167   u_int16_t checksum;
 168 };
 169
 170 /* ipv4 reachability */
 171 struct ipv4_reachability
 172 {
 173   struct metric metrics;
 174   struct in_addr prefix;
 175   struct in_addr mask;
 176 };
 177
 178 /* te router id */
 179 struct te_router_id
 180 {
 181   struct in_addr id;
 182 };
 183
 184 /* te ipv4 reachability */
 185 struct te_ipv4_reachability
 186 {
 187   u_int32_t te_metric;
 188   u_char control;
 189   u_char prefix_start;          /* since this is variable length by nature it only */
 190 };                              /* points to an approximate location */
 191
 192
 193
 194 struct idrp_info
 195 {
 196   u_char len;
 197   u_char *value;
 198 };
 199
 200 #ifdef HAVE_IPV6
 201 struct ipv6_reachability
 202 {
 203   u_int32_t metric;
 204   u_char control_info;
 205   u_char prefix_len;
 206   u_char prefix[16];
 207 };
 208 #endif /* HAVE_IPV6 */
 209
 210 /* bits in control_info */
 211 #define CTRL_INFO_DIRECTION    0x80
 212 #define DIRECTION_UP           0
 213 #define DIRECTION_DOWN         1
 214 #define CTRL_INFO_DISTRIBUTION 0x40
 215 #define DISTRIBUTION_INTERNAL  0
 216 #define DISTRIBUTION_EXTERNAL  1
 217 #define CTRL_INFO_SUBTLVS      0x20
 218
 219 /*
 220  * Pointer to each tlv type, filled by parse_tlvs()
 221  */
 222 struct tlvs
 223 {
 224   struct list *area_addrs;
 225   struct list *is_neighs;
 226   struct list *te_is_neighs;
 227   struct list *es_neighs;
 228   struct list *lsp_entries;
 229   struct list *prefix_neighs;
 230   struct list *lan_neighs;
 231   struct checksum *checksum;
 232   struct nlpids *nlpids;
 233   struct list *ipv4_addrs;
 234   struct list *ipv4_int_reachs;
 235   struct list *ipv4_ext_reachs;
 236   struct list *te_ipv4_reachs;
 237   struct hostname *hostname;
 238   struct te_router_id *router_id;
 239 #ifdef HAVE_IPV6
 240   struct list *ipv6_addrs;
 241   struct list *ipv6_reachs;
 242 #endif
 243   struct isis_passwd auth_info;
 244 };
 245
 246 /*
 247  * Own definitions - used to bitmask found and expected
 248  */
 249
 250 #define TLVFLAG_AREA_ADDRS                (1<<0)
 251 #define TLVFLAG_IS_NEIGHS                 (1<<1)
 252 #define TLVFLAG_ES_NEIGHS                 (1<<2)
 253 #define TLVFLAG_PARTITION_DESIG_LEVEL2_IS (1<<3)
 254 #define TLVFLAG_PREFIX_NEIGHS             (1<<4)
 255 #define TLVFLAG_LAN_NEIGHS                (1<<5)
 256 #define TLVFLAG_LSP_ENTRIES               (1<<6)
 257 #define TLVFLAG_PADDING                   (1<<7)
 258 #define TLVFLAG_AUTH_INFO                 (1<<8)
 259 #define TLVFLAG_IPV4_INT_REACHABILITY     (1<<9)
 260 #define TLVFLAG_NLPID                     (1<<10)
 261 #define TLVFLAG_IPV4_EXT_REACHABILITY     (1<<11)
 262 #define TLVFLAG_IPV4_ADDR                 (1<<12)
 263 #define TLVFLAG_DYN_HOSTNAME              (1<<13)
 264 #define TLVFLAG_IPV6_ADDR                 (1<<14)
 265 #define TLVFLAG_IPV6_REACHABILITY         (1<<15)
 266 #define TLVFLAG_TE_IS_NEIGHS              (1<<16)
 267 #define TLVFLAG_TE_IPV4_REACHABILITY      (1<<17)
 268 #define TLVFLAG_3WAY_HELLO                (1<<18)
 269 #define TLVFLAG_TE_ROUTER_ID              (1<<19)
 270 #define TLVFLAG_CHECKSUM                  (1<<20)
 271 #define TLVFLAG_GRACEFUL_RESTART          (1<<21)
 272
 273 void init_tlvs (struct tlvs *tlvs, uint32_t expected);
 274 void free_tlvs (struct tlvs *tlvs);
 275 int parse_tlvs (char *areatag, u_char * stream, int size,
 276                 u_int32_t * expected, u_int32_t * found, struct tlvs *tlvs);
 277 void free_tlv (void *val);
 278
 279 int add_tlv (u_char, u_char, u_char *, struct stream *);
 280 int tlv_add_area_addrs (struct list *area_addrs, struct stream *stream);
 281 int tlv_add_is_neighs (struct list *is_neighs, struct stream *stream);
 282 int tlv_add_te_is_neighs (struct list *te_is_neighs, struct stream *stream);
 283 int tlv_add_lan_neighs (struct list *lan_neighs, struct stream *stream);
 284 int tlv_add_nlpid (struct nlpids *nlpids, struct stream *stream);
 285 int tlv_add_checksum (struct checksum *checksum, struct stream *stream);
 286 int tlv_add_authinfo (char auth_type, char authlen, u_char *auth_value,
 287                       struct stream *stream);
 288 int tlv_add_ip_addrs (struct list *ip_addrs, struct stream *stream);
 289 int tlv_add_dynamic_hostname (struct hostname *hostname,
 290                               struct stream *stream);
 291 int tlv_add_lsp_entries (struct list *lsps, struct stream *stream);
 292 int tlv_add_ipv4_reachs (struct list *ipv4_reachs, struct stream *stream);
 293 int tlv_add_te_ipv4_reachs (struct list *te_ipv4_reachs, struct stream *stream);
 294 #ifdef HAVE_IPV6
 295 int tlv_add_ipv6_addrs (struct list *ipv6_addrs, struct stream *stream);
 296 int tlv_add_ipv6_reachs (struct list *ipv6_reachs, struct stream *stream);
 297 #endif /* HAVE_IPV6 */
 298
 299 int tlv_add_padding (struct stream *stream);
 300
 301 #endif /* _ZEBRA_ISIS_TLV_H */