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 * Extended 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 * Inter-AS Reachability 141 n y n RFC5316 54 * Restart TLV 211 y n n RFC3847 55 * MT IS Reachability 222 n y n RFC5120 56 * MT Supported 229 y y n RFC5120 57 * IPv6 Interface Address 232 y y n RFC5308 58 * MT IP Reachability 235 n y n RFC5120 59 * IPv6 IP Reachability 236 n y n RFC5308 60 * MT IPv6 IP Reachability 237 n y n RFC5120 61 * P2P Adjacency State 240 y n n RFC3373 62 * IIH Sequence Number 241 y n n draft-shen-isis-iih-sequence 63 * Router Capability 242 n y n RFC4971 64 * 65 * 66 * IS Reachability sub-TLVs we support (See isis_te.[c,h]) 67 * ____________________________________________________________________________ 68 * Name Value Status 69 * ____________________________________________________________________________ 70 * Administartive group (color) 3 RFC5305 71 * Link Local/Remote Identifiers 4 RFC5307 72 * IPv4 interface address 6 RFC5305 73 * IPv4 neighbor address 8 RFC5305 74 * Maximum link bandwidth 9 RFC5305 75 * Reservable link bandwidth 10 RFC5305 76 * Unreserved bandwidth 11 RFC5305 77 * TE Default metric 18 RFC5305 78 * Link Protection Type 20 RFC5307 79 * Interface Switching Capability 21 RFC5307 80 * Remote AS number 24 RFC5316 81 * IPv4 Remote ASBR identifier 25 RFC5316 82 * 83 * 84 * IP Reachability sub-TLVs we (should) support. 85 * ____________________________________________________________________________ 86 * Name Value Status 87 * ____________________________________________________________________________ 88 * 32bit administrative tag 1 RFC5130 89 * 64bit administrative tag 2 RFC5130 90 * Management prefix color 117 RFC5120 91 */ 92 93 #define AREA_ADDRESSES 1 94 #define IS_NEIGHBOURS 2 95 #define ES_NEIGHBOURS 3 96 #define LAN_NEIGHBOURS 6 97 #define PADDING 8 98 #define LSP_ENTRIES 9 99 #define AUTH_INFO 10 100 #define CHECKSUM 12 101 #define TE_IS_NEIGHBOURS 22 102 #define IS_ALIAS 24 103 #define IPV4_INT_REACHABILITY 128 104 #define PROTOCOLS_SUPPORTED 129 105 #define IPV4_EXT_REACHABILITY 130 106 #define IDRP_INFO 131 107 #define IPV4_ADDR 132 108 #define TE_ROUTER_ID 134 109 #define TE_IPV4_REACHABILITY 135 110 #define DYNAMIC_HOSTNAME 137 111 #define GRACEFUL_RESTART 211 112 #define IPV6_ADDR 232 113 #define IPV6_REACHABILITY 236 114 #define WAY3_HELLO 240 115 #define ROUTER_INFORMATION 242 116 117 #define AUTH_INFO_HDRLEN 3 118 119 #define MAX_TLV_LEN 255 120 121 #define IS_NEIGHBOURS_LEN (ISIS_SYS_ID_LEN + 5) 122 #define LAN_NEIGHBOURS_LEN 6 123 #define LSP_ENTRIES_LEN (10 + ISIS_SYS_ID_LEN) /* FIXME: should be entry */ 124 #define IPV4_REACH_LEN 12 125 #define IPV6_REACH_LEN 22 126 #define TE_IPV4_REACH_LEN 9 127 128 #define MAX_SUBTLV_SIZE 256 129 130 /* struct for neighbor */ 131 struct is_neigh 132 { 133 struct metric metrics; 134 u_char neigh_id[ISIS_SYS_ID_LEN + 1]; 135 }; 136 137 /* struct for te metric */ 138 struct te_is_neigh 139 { 140 u_char neigh_id[ISIS_SYS_ID_LEN + 1]; 141 u_char te_metric[3]; 142 u_char sub_tlvs_length; 143 /* Theorical Maximum SubTLVs is 256 because the sub_tlvs_length is 8 bits */ 144 /* Practically, 118 bytes are necessary to store all supported TE parameters */ 145 /* FIXME: A pointer will use less memory, but need to be free */ 146 /* which is hard to fix, especially within free_tlvs() function */ 147 /* and malloc() / free() as a CPU cost compared to the memory usage */ 148 u_char sub_tlvs[MAX_SUBTLV_SIZE]; /* SUB TLVs storage */ 149 }; 150 151 /* Decode and encode three-octet metric into host byte order integer */ 152 #define GET_TE_METRIC(t) \ 153 (((unsigned)(t)->te_metric[0]<<16) | ((t)->te_metric[1]<<8) | \ 154 (t)->te_metric[2]) 155 #define SET_TE_METRIC(t, m) \ 156 (((t)->te_metric[0] = (m) >> 16), \ 157 ((t)->te_metric[1] = (m) >> 8), \ 158 ((t)->te_metric[2] = (m))) 159 160 /* struct for es neighbors */ 161 struct es_neigh 162 { 163 struct metric metrics; 164 /* approximate position of first, we use the 165 * length ((uchar*)metric-1) to know all */ 166 u_char first_es_neigh[ISIS_SYS_ID_LEN]; 167 168 }; 169 170 struct partition_desig_level2_is 171 { 172 struct list *isis_system_ids; 173 }; 174 175 /* struct for lan neighbors */ 176 struct lan_neigh 177 { 178 u_char LAN_addr[6]; 179 }; 180 181 #ifdef __SUNPRO_C 182 #pragma pack(1) 183 #endif 184 185 /* struct for LSP entry */ 186 struct lsp_entry 187 { 188 u_int16_t rem_lifetime; 189 u_char lsp_id[ISIS_SYS_ID_LEN + 2]; 190 u_int32_t seq_num; 191 u_int16_t checksum; 192 } __attribute__ ((packed)); 193 194 #ifdef __SUNPRO_C 195 #pragma pack() 196 #endif 197 198 /* struct for checksum */ 199 struct checksum 200 { 201 u_int16_t checksum; 202 }; 203 204 /* ipv4 reachability */ 205 struct ipv4_reachability 206 { 207 struct metric metrics; 208 struct in_addr prefix; 209 struct in_addr mask; 210 }; 211 212 /* te router id */ 213 struct te_router_id 214 { 215 struct in_addr id; 216 }; 217 218 /* te ipv4 reachability */ 219 struct te_ipv4_reachability 220 { 221 u_int32_t te_metric; 222 u_char control; 223 u_char prefix_start; /* since this is variable length by nature it only */ 224 }; /* points to an approximate location */ 225 226 227 228 struct idrp_info 229 { 230 u_char len; 231 u_char *value; 232 }; 233 234 #ifdef HAVE_IPV6 235 struct ipv6_reachability 236 { 237 u_int32_t metric; 238 u_char control_info; 239 u_char prefix_len; 240 u_char prefix[16]; 241 }; 242 243 /* bits in control_info */ 244 #define CTRL_INFO_DIRECTION 0x80 245 #define DIRECTION_UP 0x00 246 #define DIRECTION_DOWN 0x80 247 248 #define CTRL_INFO_DISTRIBUTION 0x40 249 #define DISTRIBUTION_INTERNAL 0x00 250 #define DISTRIBUTION_EXTERNAL 0x40 251 252 #define CTRL_INFO_SUBTLVS 0x20 253 #endif /* HAVE_IPV6 */ 254 255 /* 256 * Pointer to each tlv type, filled by parse_tlvs() 257 */ 258 struct tlvs 259 { 260 struct checksum *checksum; 261 struct hostname *hostname; 262 struct nlpids *nlpids; 263 struct te_router_id *router_id; 264 struct list *area_addrs; 265 struct list *is_neighs; 266 struct list *te_is_neighs; 267 struct list *es_neighs; 268 struct list *lsp_entries; 269 struct list *prefix_neighs; 270 struct list *lan_neighs; 271 struct list *ipv4_addrs; 272 struct list *ipv4_int_reachs; 273 struct list *ipv4_ext_reachs; 274 struct list *te_ipv4_reachs; 275 #ifdef HAVE_IPV6 276 struct list *ipv6_addrs; 277 struct list *ipv6_reachs; 278 #endif 279 struct isis_passwd auth_info; 280 }; 281 282 /* 283 * Own definitions - used to bitmask found and expected 284 */ 285 286 #define TLVFLAG_AREA_ADDRS (1<<0) 287 #define TLVFLAG_IS_NEIGHS (1<<1) 288 #define TLVFLAG_ES_NEIGHS (1<<2) 289 #define TLVFLAG_PARTITION_DESIG_LEVEL2_IS (1<<3) 290 #define TLVFLAG_PREFIX_NEIGHS (1<<4) 291 #define TLVFLAG_LAN_NEIGHS (1<<5) 292 #define TLVFLAG_LSP_ENTRIES (1<<6) 293 #define TLVFLAG_PADDING (1<<7) 294 #define TLVFLAG_AUTH_INFO (1<<8) 295 #define TLVFLAG_IPV4_INT_REACHABILITY (1<<9) 296 #define TLVFLAG_NLPID (1<<10) 297 #define TLVFLAG_IPV4_EXT_REACHABILITY (1<<11) 298 #define TLVFLAG_IPV4_ADDR (1<<12) 299 #define TLVFLAG_DYN_HOSTNAME (1<<13) 300 #define TLVFLAG_IPV6_ADDR (1<<14) 301 #define TLVFLAG_IPV6_REACHABILITY (1<<15) 302 #define TLVFLAG_TE_IS_NEIGHS (1<<16) 303 #define TLVFLAG_TE_IPV4_REACHABILITY (1<<17) 304 #define TLVFLAG_3WAY_HELLO (1<<18) 305 #define TLVFLAG_TE_ROUTER_ID (1<<19) 306 #define TLVFLAG_CHECKSUM (1<<20) 307 #define TLVFLAG_GRACEFUL_RESTART (1<<21) 308 309 void init_tlvs (struct tlvs *tlvs, uint32_t expected); 310 void free_tlvs (struct tlvs *tlvs); 311 int parse_tlvs (char *areatag, u_char * stream, int size, 312 u_int32_t * expected, u_int32_t * found, struct tlvs *tlvs, 313 u_int32_t * auth_tlv_offset); 314 int add_tlv (u_char, u_char, u_char *, struct stream *); 315 void free_tlv (void *val); 316 317 int tlv_add_area_addrs (struct list *area_addrs, struct stream *stream); 318 int tlv_add_is_neighs (struct list *is_neighs, struct stream *stream); 319 int tlv_add_te_is_neighs (struct list *te_is_neighs, struct stream *stream); 320 int tlv_add_lan_neighs (struct list *lan_neighs, struct stream *stream); 321 int tlv_add_nlpid (struct nlpids *nlpids, struct stream *stream); 322 int tlv_add_checksum (struct checksum *checksum, struct stream *stream); 323 int tlv_add_authinfo (u_char auth_type, u_char authlen, u_char *auth_value, 324 struct stream *stream); 325 int tlv_add_ip_addrs (struct list *ip_addrs, struct stream *stream); 326 int tlv_add_in_addr (struct in_addr *, struct stream *stream, u_char tag); 327 int tlv_add_dynamic_hostname (struct hostname *hostname, 328 struct stream *stream); 329 int tlv_add_lsp_entries (struct list *lsps, struct stream *stream); 330 int tlv_add_ipv4_int_reachs (struct list *ipv4_reachs, struct stream *stream); 331 int tlv_add_ipv4_ext_reachs (struct list *ipv4_reachs, struct stream *stream); 332 int tlv_add_te_ipv4_reachs (struct list *te_ipv4_reachs, struct stream *stream); 333 #ifdef HAVE_IPV6 334 int tlv_add_ipv6_addrs (struct list *ipv6_addrs, struct stream *stream); 335 int tlv_add_ipv6_reachs (struct list *ipv6_reachs, struct stream *stream); 336 #endif /* HAVE_IPV6 */ 337 338 int tlv_add_padding (struct stream *stream); 339 340 #endif /* _ZEBRA_ISIS_TLV_H */ 341