isisd/isis_tlvs.h

   1 /*
   2  * IS-IS TLV Serializer/Deserializer
   3  *
   4  * Copyright (C) 2015,2017 Christian Franke
   5  *
   6  * This file is part of FRR.
   7  *
   8  * FRR is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2, or (at your option) any
  11  * later version.
  12  *
  13  * FRR is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with FRR; see the file COPYING.  If not, write to the Free
  20  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  21  * 02111-1307, USA.
  22  */
  23 #ifndef ISIS_TLVS_H
  24 #define ISIS_TLVS_H
  25
  26 #include "openbsd-tree.h"
  27 #include "prefix.h"
  28 #include "isisd/dict.h"
  29
  30 struct isis_subtlvs;
  31
  32 struct isis_area_address;
  33 struct isis_area_address {
  34         struct isis_area_address *next;
  35
  36         uint8_t addr[20];
  37         uint8_t len;
  38 };
  39
  40 struct isis_oldstyle_reach;
  41 struct isis_oldstyle_reach {
  42         struct isis_oldstyle_reach *next;
  43
  44         uint8_t id[7];
  45         uint8_t metric;
  46 };
  47
  48 struct isis_oldstyle_ip_reach;
  49 struct isis_oldstyle_ip_reach {
  50         struct isis_oldstyle_ip_reach *next;
  51
  52         uint8_t metric;
  53         struct prefix_ipv4 prefix;
  54 };
  55
  56 struct isis_lsp_entry;
  57 struct isis_lsp_entry {
  58         struct isis_lsp_entry *next;
  59
  60         uint16_t rem_lifetime;
  61         uint8_t id[8];
  62         uint16_t checksum;
  63         uint32_t seqno;
  64
  65         struct isis_lsp *lsp;
  66 };
  67
  68 struct isis_extended_reach;
  69 struct isis_extended_reach {
  70         struct isis_extended_reach *next;
  71
  72         uint8_t id[7];
  73         uint32_t metric;
  74
  75         uint8_t *subtlvs;
  76         uint8_t subtlv_len;
  77 };
  78
  79 struct isis_extended_ip_reach;
  80 struct isis_extended_ip_reach {
  81         struct isis_extended_ip_reach *next;
  82
  83         uint32_t metric;
  84         bool down;
  85         struct prefix_ipv4 prefix;
  86 };
  87
  88 struct isis_ipv6_reach;
  89 struct isis_ipv6_reach {
  90         struct isis_ipv6_reach *next;
  91
  92         uint32_t metric;
  93         bool down;
  94         bool external;
  95
  96         struct prefix_ipv6 prefix;
  97
  98         struct isis_subtlvs *subtlvs;
  99 };
 100
 101 struct isis_protocols_supported {
 102         uint8_t count;
 103         uint8_t *protocols;
 104 };
 105
 106 enum isis_threeway_state {
 107         ISIS_THREEWAY_DOWN = 2,
 108         ISIS_THREEWAY_INITIALIZING = 1,
 109         ISIS_THREEWAY_UP = 0
 110 };
 111
 112 struct isis_threeway_adj {
 113         enum isis_threeway_state state;
 114         uint32_t local_circuit_id;
 115         bool neighbor_set;
 116         uint8_t neighbor_id[6];
 117         uint32_t neighbor_circuit_id;
 118 };
 119
 120 struct isis_item;
 121 struct isis_item {
 122         struct isis_item *next;
 123 };
 124
 125 struct isis_lan_neighbor;
 126 struct isis_lan_neighbor {
 127         struct isis_lan_neighbor *next;
 128
 129         uint8_t mac[6];
 130 };
 131
 132 struct isis_ipv4_address;
 133 struct isis_ipv4_address {
 134         struct isis_ipv4_address *next;
 135
 136         struct in_addr addr;
 137 };
 138
 139 struct isis_ipv6_address;
 140 struct isis_ipv6_address {
 141         struct isis_ipv6_address *next;
 142
 143         struct in6_addr addr;
 144 };
 145
 146 struct isis_mt_router_info;
 147 struct isis_mt_router_info {
 148         struct isis_mt_router_info *next;
 149
 150         bool overload;
 151         bool attached;
 152         uint16_t mtid;
 153 };
 154
 155 struct isis_auth;
 156 struct isis_auth {
 157         struct isis_auth *next;
 158
 159         uint8_t type;
 160         uint8_t length;
 161         uint8_t value[256];
 162
 163         uint8_t plength;
 164         uint8_t passwd[256];
 165
 166         size_t offset; /* Only valid after packing */
 167 };
 168
 169 struct isis_item_list;
 170 struct isis_item_list {
 171         struct isis_item *head;
 172         struct isis_item **tail;
 173
 174         RB_ENTRY(isis_item_list) mt_tree;
 175         uint16_t mtid;
 176         unsigned int count;
 177 };
 178
 179 RB_HEAD(isis_mt_item_list, isis_item_list);
 180
 181 struct isis_item_list *isis_get_mt_items(struct isis_mt_item_list *m,
 182                                          uint16_t mtid);
 183 struct isis_item_list *isis_lookup_mt_items(struct isis_mt_item_list *m,
 184                                             uint16_t mtid);
 185
 186 struct isis_tlvs {
 187         struct isis_item_list isis_auth;
 188         struct isis_item_list area_addresses;
 189         struct isis_item_list oldstyle_reach;
 190         struct isis_item_list lan_neighbor;
 191         struct isis_item_list lsp_entries;
 192         struct isis_item_list extended_reach;
 193         struct isis_mt_item_list mt_reach;
 194         struct isis_item_list oldstyle_ip_reach;
 195         struct isis_protocols_supported protocols_supported;
 196         struct isis_item_list oldstyle_ip_reach_ext;
 197         struct isis_item_list ipv4_address;
 198         struct isis_item_list ipv6_address;
 199         struct isis_item_list mt_router_info;
 200         bool mt_router_info_empty;
 201         struct in_addr *te_router_id;
 202         struct isis_item_list extended_ip_reach;
 203         struct isis_mt_item_list mt_ip_reach;
 204         char *hostname;
 205         struct isis_item_list ipv6_reach;
 206         struct isis_mt_item_list mt_ipv6_reach;
 207         struct isis_threeway_adj *threeway_adj;
 208 };
 209
 210 struct isis_subtlvs {
 211         /* draft-baker-ipv6-isis-dst-src-routing-06 */
 212         struct prefix_ipv6 *source_prefix;
 213 };
 214
 215 enum isis_tlv_context {
 216         ISIS_CONTEXT_LSP,
 217         ISIS_CONTEXT_SUBTLV_NE_REACH,
 218         ISIS_CONTEXT_SUBTLV_IP_REACH,
 219         ISIS_CONTEXT_SUBTLV_IPV6_REACH,
 220         ISIS_CONTEXT_MAX
 221 };
 222
 223 enum isis_tlv_type {
 224         ISIS_TLV_AREA_ADDRESSES = 1,
 225         ISIS_TLV_OLDSTYLE_REACH = 2,
 226         ISIS_TLV_LAN_NEIGHBORS = 6,
 227         ISIS_TLV_PADDING = 8,
 228         ISIS_TLV_LSP_ENTRY = 9,
 229         ISIS_TLV_AUTH = 10,
 230         ISIS_TLV_EXTENDED_REACH = 22,
 231
 232         ISIS_TLV_OLDSTYLE_IP_REACH = 128,
 233         ISIS_TLV_PROTOCOLS_SUPPORTED = 129,
 234         ISIS_TLV_OLDSTYLE_IP_REACH_EXT = 130,
 235         ISIS_TLV_IPV4_ADDRESS = 132,
 236         ISIS_TLV_TE_ROUTER_ID = 134,
 237         ISIS_TLV_EXTENDED_IP_REACH = 135,
 238         ISIS_TLV_DYNAMIC_HOSTNAME = 137,
 239         ISIS_TLV_MT_REACH = 222,
 240         ISIS_TLV_MT_ROUTER_INFO = 229,
 241         ISIS_TLV_IPV6_ADDRESS = 232,
 242         ISIS_TLV_MT_IP_REACH = 235,
 243         ISIS_TLV_IPV6_REACH = 236,
 244         ISIS_TLV_MT_IPV6_REACH = 237,
 245         ISIS_TLV_THREE_WAY_ADJ = 240,
 246         ISIS_TLV_MAX = 256,
 247
 248         ISIS_SUBTLV_IPV6_SOURCE_PREFIX = 22
 249 };
 250
 251 #define IS_COMPAT_MT_TLV(tlv_type)                                             \
 252         ((tlv_type == ISIS_TLV_MT_REACH) || (tlv_type == ISIS_TLV_MT_IP_REACH) \
 253          || (tlv_type == ISIS_TLV_MT_IPV6_REACH))
 254
 255 struct stream;
 256 int isis_pack_tlvs(struct isis_tlvs *tlvs, struct stream *stream,
 257                    size_t len_pointer, bool pad, bool is_lsp);
 258 void isis_free_tlvs(struct isis_tlvs *tlvs);
 259 struct isis_tlvs *isis_alloc_tlvs(void);
 260 int isis_unpack_tlvs(size_t avail_len, struct stream *stream,
 261                      struct isis_tlvs **dest, const char **error_log);
 262 const char *isis_format_tlvs(struct isis_tlvs *tlvs);
 263 struct isis_tlvs *isis_copy_tlvs(struct isis_tlvs *tlvs);
 264 struct list *isis_fragment_tlvs(struct isis_tlvs *tlvs, size_t size);
 265
 266 #define ISIS_EXTENDED_IP_REACH_DOWN 0x80
 267 #define ISIS_EXTENDED_IP_REACH_SUBTLV 0x40
 268
 269 #define ISIS_IPV6_REACH_DOWN 0x80
 270 #define ISIS_IPV6_REACH_EXTERNAL 0x40
 271 #define ISIS_IPV6_REACH_SUBTLV 0x20
 272
 273 #ifndef ISIS_MT_MASK
 274 #define ISIS_MT_MASK           0x0fff
 275 #define ISIS_MT_OL_MASK        0x8000
 276 #define ISIS_MT_AT_MASK        0x4000
 277 #endif
 278
 279
 280 void isis_tlvs_add_auth(struct isis_tlvs *tlvs, struct isis_passwd *passwd);
 281 void isis_tlvs_add_area_addresses(struct isis_tlvs *tlvs,
 282                                   struct list *addresses);
 283 void isis_tlvs_add_lan_neighbors(struct isis_tlvs *tlvs,
 284                                  struct list *neighbors);
 285 void isis_tlvs_set_protocols_supported(struct isis_tlvs *tlvs,
 286                                        struct nlpids *nlpids);
 287 void isis_tlvs_add_mt_router_info(struct isis_tlvs *tlvs, uint16_t mtid,
 288                                   bool overload, bool attached);
 289 void isis_tlvs_add_ipv4_address(struct isis_tlvs *tlvs, struct in_addr *addr);
 290 void isis_tlvs_add_ipv4_addresses(struct isis_tlvs *tlvs,
 291                                   struct list *addresses);
 292 void isis_tlvs_add_ipv6_addresses(struct isis_tlvs *tlvs,
 293                                   struct list *addresses);
 294 bool isis_tlvs_auth_is_valid(struct isis_tlvs *tlvs, struct isis_passwd *passwd,
 295                              struct stream *stream, bool is_lsp);
 296 bool isis_tlvs_area_addresses_match(struct isis_tlvs *tlvs,
 297                                     struct list *addresses);
 298 struct isis_adjacency;
 299 void isis_tlvs_to_adj(struct isis_tlvs *tlvs, struct isis_adjacency *adj,
 300                       bool *changed);
 301 bool isis_tlvs_own_snpa_found(struct isis_tlvs *tlvs, uint8_t *snpa);
 302 void isis_tlvs_add_lsp_entry(struct isis_tlvs *tlvs, struct isis_lsp *lsp);
 303 void isis_tlvs_add_csnp_entries(struct isis_tlvs *tlvs, uint8_t *start_id,
 304                                 uint8_t *stop_id, uint16_t num_lsps,
 305                                 dict_t *lspdb, struct isis_lsp **last_lsp);
 306 void isis_tlvs_set_dynamic_hostname(struct isis_tlvs *tlvs,
 307                                     const char *hostname);
 308 void isis_tlvs_set_te_router_id(struct isis_tlvs *tlvs,
 309                                 const struct in_addr *id);
 310 void isis_tlvs_add_oldstyle_ip_reach(struct isis_tlvs *tlvs,
 311                                      struct prefix_ipv4 *dest, uint8_t metric);
 312 void isis_tlvs_add_extended_ip_reach(struct isis_tlvs *tlvs,
 313                                      struct prefix_ipv4 *dest, uint32_t metric);
 314 void isis_tlvs_add_ipv6_reach(struct isis_tlvs *tlvs, uint16_t mtid,
 315                               struct prefix_ipv6 *dest, uint32_t metric);
 316 void isis_tlvs_add_ipv6_dstsrc_reach(struct isis_tlvs *tlvs, uint16_t mtid,
 317                                      struct prefix_ipv6 *dest,
 318                                      struct prefix_ipv6 *src,
 319                                      uint32_t metric);
 320 void isis_tlvs_add_oldstyle_reach(struct isis_tlvs *tlvs, uint8_t *id,
 321                                   uint8_t metric);
 322 void isis_tlvs_add_extended_reach(struct isis_tlvs *tlvs, uint16_t mtid,
 323                                   uint8_t *id, uint32_t metric,
 324                                   uint8_t *subtlvs, uint8_t subtlv_len);
 325
 326 const char *isis_threeway_state_name(enum isis_threeway_state state);
 327
 328 void isis_tlvs_add_threeway_adj(struct isis_tlvs *tlvs,
 329                                 enum isis_threeway_state state,
 330                                 uint32_t local_circuit_id,
 331                                 const uint8_t *neighbor_id,
 332                                 uint32_t neighbor_circuit_id);
 333
 334 struct isis_mt_router_info *
 335 isis_tlvs_lookup_mt_router_info(struct isis_tlvs *tlvs, uint16_t mtid);
 336 #endif