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  RFC5305
  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  RFC5305
  50  * Extended IP Reachability 135   n   y   n  RFC5305
  51  * Dynamic Hostname         137   n   y   n  RFC2763
  52  * Shared Risk Link Group   138   n   y   y  RFC5307
  53  * Restart TLV              211   y   n   n  RFC3847
  54  * MT IS Reachability       222   n   y   n  RFC5120
  55  * MT Supported             229   y   y   n  RFC5120
  56  * IPv6 Interface Address   232   y   y   n  RFC5308
  57  * MT IP Reachability       235   n   y   n  RFC5120
  58  * IPv6 IP Reachability     236   n   y   n  RFC5308
  59  * MT IPv6 IP Reachability  237   n   y   n  RFC5120
  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   RFC5305
  70  * Link Local/Remote Identifiers      4   RFC5307
  71  * IPv4 interface address             6   RFC5305
  72  * IPv4 neighbor address              8   RFC5305
  73  * Maximum link bandwidth             9   RFC5305
  74  * Reservable link bandwidth         10   RFC5305
  75  * Unreserved bandwidth              11   RFC5305
  76  * TE Default metric                 18   RFC5305
  77  * Link Protection Type              20   RFC5307
  78  * Interface Switching Capability    21   RFC5307
  79  *
  80  *
  81  * IP Reachability sub-TLVs we (should) support.
  82  * ____________________________________________________________________________
  83  * Name                           Value   Status
  84  * ____________________________________________________________________________
  85  * 32bit administrative tag           1   RFC5130
  86  * 64bit administrative tag           2   RFC5130
  87  * Management prefix color          117   RFC5120
  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 AUTH_INFO_HDRLEN          3
 114
 115 #define MAX_TLV_LEN 255
 116
 117 #define IS_NEIGHBOURS_LEN (ISIS_SYS_ID_LEN + 5)
 118 #define LAN_NEIGHBOURS_LEN 6
 119 #define LSP_ENTRIES_LEN (10 + ISIS_SYS_ID_LEN)  /* FIXME: should be entry */
 120 #define IPV4_REACH_LEN 12
 121 #define IPV6_REACH_LEN 22
 122 #define TE_IPV4_REACH_LEN 9
 123
 124 /* struct for neighbor */
 125 struct is_neigh
 126 {
 127   struct metric metrics;
 128   u_char neigh_id[ISIS_SYS_ID_LEN + 1];
 129 };
 130
 131 /* struct for te is neighbor */
 132 struct te_is_neigh
 133 {
 134   u_char neigh_id[ISIS_SYS_ID_LEN + 1];
 135   u_char te_metric[3];
 136   u_char sub_tlvs_length;
 137 };
 138
 139 /* Decode and encode three-octet metric into host byte order integer */
 140 #define GET_TE_METRIC(t) \
 141   (((unsigned)(t)->te_metric[0]<<16) | ((t)->te_metric[1]<<8) | \
 142    (t)->te_metric[2])
 143 #define SET_TE_METRIC(t, m) \
 144   (((t)->te_metric[0] = (m) >> 16), \
 145    ((t)->te_metric[1] = (m) >> 8), \
 146    ((t)->te_metric[2] = (m)))
 147
 148 /* struct for es neighbors */
 149 struct es_neigh
 150 {
 151   struct metric metrics;
 152   /* approximate position of first, we use the
 153    * length ((uchar*)metric-1) to know all     */
 154   u_char first_es_neigh[ISIS_SYS_ID_LEN];
 155
 156 };
 157
 158 struct partition_desig_level2_is
 159 {
 160   struct list *isis_system_ids;
 161 };
 162
 163 /* struct for lan neighbors */
 164 struct lan_neigh
 165 {
 166   u_char LAN_addr[6];
 167 };
 168
 169 #ifdef __SUNPRO_C
 170 #pragma pack(1)
 171 #endif
 172
 173 /* struct for LSP entry */
 174 struct lsp_entry
 175 {
 176   u_int16_t rem_lifetime;
 177   u_char lsp_id[ISIS_SYS_ID_LEN + 2];
 178   u_int32_t seq_num;
 179   u_int16_t checksum;
 180 } __attribute__ ((packed));
 181
 182 #ifdef __SUNPRO_C
 183 #pragma pack()
 184 #endif
 185
 186 /* struct for checksum */
 187 struct checksum
 188 {
 189   u_int16_t checksum;
 190 };
 191
 192 /* ipv4 reachability */
 193 struct ipv4_reachability
 194 {
 195   struct metric metrics;
 196   struct in_addr prefix;
 197   struct in_addr mask;
 198 };
 199
 200 /* te router id */
 201 struct te_router_id
 202 {
 203   struct in_addr id;
 204 };
 205
 206 /* te ipv4 reachability */
 207 struct te_ipv4_reachability
 208 {
 209   u_int32_t te_metric;
 210   u_char control;
 211   u_char prefix_start;          /* since this is variable length by nature it only */
 212 };                              /* points to an approximate location */
 213
 214
 215
 216 struct idrp_info
 217 {
 218   u_char len;
 219   u_char *value;
 220 };
 221
 222 #ifdef HAVE_IPV6
 223 struct ipv6_reachability
 224 {
 225   u_int32_t metric;
 226   u_char control_info;
 227   u_char prefix_len;
 228   u_char prefix[16];
 229 };
 230
 231 /* bits in control_info */
 232 #define CTRL_INFO_DIRECTION    0x80
 233 #define DIRECTION_UP           0x00
 234 #define DIRECTION_DOWN         0x80
 235
 236 #define CTRL_INFO_DISTRIBUTION 0x40
 237 #define DISTRIBUTION_INTERNAL  0x00
 238 #define DISTRIBUTION_EXTERNAL  0x40
 239
 240 #define CTRL_INFO_SUBTLVS      0x20
 241 #endif /* HAVE_IPV6 */
 242
 243 /*
 244  * Pointer to each tlv type, filled by parse_tlvs()
 245  */
 246 struct tlvs
 247 {
 248   struct checksum *checksum;
 249   struct hostname *hostname;
 250   struct nlpids *nlpids;
 251   struct te_router_id *router_id;
 252   struct list *area_addrs;
 253   struct list *is_neighs;
 254   struct list *te_is_neighs;
 255   struct list *es_neighs;
 256   struct list *lsp_entries;
 257   struct list *prefix_neighs;
 258   struct list *lan_neighs;
 259   struct list *ipv4_addrs;
 260   struct list *ipv4_int_reachs;
 261   struct list *ipv4_ext_reachs;
 262   struct list *te_ipv4_reachs;
 263 #ifdef HAVE_IPV6
 264   struct list *ipv6_addrs;
 265   struct list *ipv6_reachs;
 266 #endif
 267   struct isis_passwd auth_info;
 268 };
 269
 270 /*
 271  * Own definitions - used to bitmask found and expected
 272  */
 273
 274 #define TLVFLAG_AREA_ADDRS                (1<<0)
 275 #define TLVFLAG_IS_NEIGHS                 (1<<1)
 276 #define TLVFLAG_ES_NEIGHS                 (1<<2)
 277 #define TLVFLAG_PARTITION_DESIG_LEVEL2_IS (1<<3)
 278 #define TLVFLAG_PREFIX_NEIGHS             (1<<4)
 279 #define TLVFLAG_LAN_NEIGHS                (1<<5)
 280 #define TLVFLAG_LSP_ENTRIES               (1<<6)
 281 #define TLVFLAG_PADDING                   (1<<7)
 282 #define TLVFLAG_AUTH_INFO                 (1<<8)
 283 #define TLVFLAG_IPV4_INT_REACHABILITY     (1<<9)
 284 #define TLVFLAG_NLPID                     (1<<10)
 285 #define TLVFLAG_IPV4_EXT_REACHABILITY     (1<<11)
 286 #define TLVFLAG_IPV4_ADDR                 (1<<12)
 287 #define TLVFLAG_DYN_HOSTNAME              (1<<13)
 288 #define TLVFLAG_IPV6_ADDR                 (1<<14)
 289 #define TLVFLAG_IPV6_REACHABILITY         (1<<15)
 290 #define TLVFLAG_TE_IS_NEIGHS              (1<<16)
 291 #define TLVFLAG_TE_IPV4_REACHABILITY      (1<<17)
 292 #define TLVFLAG_3WAY_HELLO                (1<<18)
 293 #define TLVFLAG_TE_ROUTER_ID              (1<<19)
 294 #define TLVFLAG_CHECKSUM                  (1<<20)
 295 #define TLVFLAG_GRACEFUL_RESTART          (1<<21)
 296
 297 void init_tlvs (struct tlvs *tlvs, uint32_t expected);
 298 void free_tlvs (struct tlvs *tlvs);
 299 int parse_tlvs (char *areatag, u_char * stream, int size,
 300                 u_int32_t * expected, u_int32_t * found, struct tlvs *tlvs,
 301                 u_int32_t * auth_tlv_offset);
 302 int add_tlv (u_char, u_char, u_char *, struct stream *);
 303 void free_tlv (void *val);
 304
 305 int tlv_add_area_addrs (struct list *area_addrs, struct stream *stream);
 306 int tlv_add_is_neighs (struct list *is_neighs, struct stream *stream);
 307 int tlv_add_te_is_neighs (struct list *te_is_neighs, struct stream *stream);
 308 int tlv_add_lan_neighs (struct list *lan_neighs, struct stream *stream);
 309 int tlv_add_nlpid (struct nlpids *nlpids, struct stream *stream);
 310 int tlv_add_checksum (struct checksum *checksum, struct stream *stream);
 311 int tlv_add_authinfo (u_char auth_type, u_char authlen, u_char *auth_value,
 312                       struct stream *stream);
 313 int tlv_add_ip_addrs (struct list *ip_addrs, struct stream *stream);
 314 int tlv_add_in_addr (struct in_addr *, struct stream *stream, u_char tag);
 315 int tlv_add_dynamic_hostname (struct hostname *hostname,
 316                               struct stream *stream);
 317 int tlv_add_lsp_entries (struct list *lsps, struct stream *stream);
 318 int tlv_add_ipv4_int_reachs (struct list *ipv4_reachs, struct stream *stream);
 319 int tlv_add_ipv4_ext_reachs (struct list *ipv4_reachs, struct stream *stream);
 320 int tlv_add_te_ipv4_reachs (struct list *te_ipv4_reachs, struct stream *stream);
 321 #ifdef HAVE_IPV6
 322 int tlv_add_ipv6_addrs (struct list *ipv6_addrs, struct stream *stream);
 323 int tlv_add_ipv6_reachs (struct list *ipv6_reachs, struct stream *stream);
 324 #endif /* HAVE_IPV6 */
 325
 326 int tlv_add_padding (struct stream *stream);
 327
 328 #endif /* _ZEBRA_ISIS_TLV_H */