1 /* $OpenBSD: session.h,v 1.174 2024/10/01 11:49:24 claudio Exp $ */ 2 3 /* 4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/socket.h> 21 #include <time.h> 22 23 #define MAX_BACKLOG 5 24 #define INTERVAL_CONNECTRETRY 120 25 #define INTERVAL_HOLD_INITIAL 240 26 #define INTERVAL_HOLD 90 27 #define INTERVAL_IDLE_HOLD_INITIAL 30 28 #define INTERVAL_HOLD_CLONED 3600 29 #define INTERVAL_HOLD_DEMOTED 60 30 #define MAX_IDLE_HOLD 3600 31 #define MSGSIZE_HEADER 19 32 #define MSGSIZE_HEADER_MARKER 16 33 #define MSGSIZE_NOTIFICATION_MIN 21 /* 19 hdr + 1 code + 1 sub */ 34 #define MSGSIZE_OPEN_MIN 29 35 #define MSGSIZE_UPDATE_MIN 23 36 #define MSGSIZE_KEEPALIVE MSGSIZE_HEADER 37 #define MSGSIZE_RREFRESH (MSGSIZE_HEADER + 4) 38 #define MSGSIZE_RREFRESH_MIN MSGSIZE_RREFRESH 39 #define MSG_PROCESS_LIMIT 25 40 #define SESSION_CLEAR_DELAY 5 41 42 enum session_state { 43 STATE_NONE, 44 STATE_IDLE, 45 STATE_CONNECT, 46 STATE_ACTIVE, 47 STATE_OPENSENT, 48 STATE_OPENCONFIRM, 49 STATE_ESTABLISHED 50 }; 51 52 enum session_events { 53 EVNT_NONE, 54 EVNT_START, 55 EVNT_STOP, 56 EVNT_CON_OPEN, 57 EVNT_CON_CLOSED, 58 EVNT_CON_OPENFAIL, 59 EVNT_CON_FATAL, 60 EVNT_TIMER_CONNRETRY, 61 EVNT_TIMER_HOLDTIME, 62 EVNT_TIMER_KEEPALIVE, 63 EVNT_TIMER_SENDHOLD, 64 EVNT_RCVD_OPEN, 65 EVNT_RCVD_KEEPALIVE, 66 EVNT_RCVD_UPDATE, 67 EVNT_RCVD_NOTIFICATION 68 }; 69 70 enum msg_type { 71 OPEN = 1, 72 UPDATE, 73 NOTIFICATION, 74 KEEPALIVE, 75 RREFRESH 76 }; 77 78 enum suberr_header { 79 ERR_HDR_SYNC = 1, 80 ERR_HDR_LEN, 81 ERR_HDR_TYPE 82 }; 83 84 enum suberr_open { 85 ERR_OPEN_VERSION = 1, 86 ERR_OPEN_AS, 87 ERR_OPEN_BGPID, 88 ERR_OPEN_OPT, 89 ERR_OPEN_AUTH, /* deprecated */ 90 ERR_OPEN_HOLDTIME, 91 ERR_OPEN_CAPA, 92 ERR_OPEN_ROLE = 11, 93 }; 94 95 enum suberr_fsm { 96 ERR_FSM_UNSPECIFIC = 0, 97 ERR_FSM_UNEX_OPENSENT, 98 ERR_FSM_UNEX_OPENCONFIRM, 99 ERR_FSM_UNEX_ESTABLISHED 100 }; 101 102 enum opt_params { 103 OPT_PARAM_NONE, 104 OPT_PARAM_AUTH, 105 OPT_PARAM_CAPABILITIES, 106 OPT_PARAM_EXT_LEN=255, 107 }; 108 109 struct bgp_msg { 110 struct ibuf *buf; 111 enum msg_type type; 112 uint16_t len; 113 }; 114 115 struct bgpd_sysdep { 116 uint8_t no_pfkey; 117 uint8_t no_md5sig; 118 }; 119 120 struct ctl_conn { 121 TAILQ_ENTRY(ctl_conn) entry; 122 struct imsgbuf imsgbuf; 123 int restricted; 124 int throttled; 125 int terminate; 126 }; 127 128 struct peer_stats { 129 unsigned long long msg_rcvd_open; 130 unsigned long long msg_rcvd_update; 131 unsigned long long msg_rcvd_notification; 132 unsigned long long msg_rcvd_keepalive; 133 unsigned long long msg_rcvd_rrefresh; 134 unsigned long long msg_sent_open; 135 unsigned long long msg_sent_update; 136 unsigned long long msg_sent_notification; 137 unsigned long long msg_sent_keepalive; 138 unsigned long long msg_sent_rrefresh; 139 unsigned long long refresh_rcvd_req; 140 unsigned long long refresh_rcvd_borr; 141 unsigned long long refresh_rcvd_eorr; 142 unsigned long long refresh_sent_req; 143 unsigned long long refresh_sent_borr; 144 unsigned long long refresh_sent_eorr; 145 unsigned long long prefix_rcvd_update; 146 unsigned long long prefix_rcvd_withdraw; 147 unsigned long long prefix_rcvd_eor; 148 unsigned long long prefix_sent_update; 149 unsigned long long prefix_sent_withdraw; 150 unsigned long long prefix_sent_eor; 151 time_t last_updown; 152 time_t last_read; 153 time_t last_write; 154 uint32_t msg_queue_len; 155 uint32_t prefix_cnt; 156 uint32_t prefix_out_cnt; 157 uint32_t pending_update; 158 uint32_t pending_withdraw; 159 uint8_t last_sent_errcode; 160 uint8_t last_sent_suberr; 161 uint8_t last_rcvd_errcode; 162 uint8_t last_rcvd_suberr; 163 char last_reason[REASON_LEN]; 164 }; 165 166 struct auth_state { 167 struct bgpd_addr local_addr; 168 struct bgpd_addr remote_addr; 169 uint32_t spi_in; 170 uint32_t spi_out; 171 enum auth_method method; 172 uint8_t established; 173 }; 174 175 enum Timer { 176 Timer_None, 177 Timer_ConnectRetry, 178 Timer_Keepalive, 179 Timer_Hold, 180 Timer_SendHold, 181 Timer_IdleHold, 182 Timer_IdleHoldReset, 183 Timer_CarpUndemote, 184 Timer_RestartTimeout, 185 Timer_Rtr_Refresh, 186 Timer_Rtr_Retry, 187 Timer_Rtr_Expire, 188 Timer_Rtr_Active, 189 Timer_Max 190 }; 191 192 struct timer { 193 TAILQ_ENTRY(timer) entry; 194 enum Timer type; 195 time_t val; 196 }; 197 198 TAILQ_HEAD(timer_head, timer); 199 200 struct peer { 201 struct peer_config conf; 202 struct peer_stats stats; 203 RB_ENTRY(peer) entry; 204 struct { 205 struct capabilities ann; 206 struct capabilities peer; 207 struct capabilities neg; 208 } capa; 209 struct auth_state auth_state; 210 struct auth_config auth_conf; 211 struct bgpd_addr local; 212 struct bgpd_addr local_alt; 213 struct bgpd_addr remote; 214 struct timer_head timers; 215 struct msgbuf wbuf; 216 struct ibuf_read *rbuf; 217 struct peer *template; 218 int fd; 219 int lasterr; 220 u_int errcnt; 221 u_int IdleHoldTime; 222 unsigned int if_scope; /* interface scope for IPv6 */ 223 uint32_t remote_bgpid; 224 enum session_state state; 225 enum session_state prev_state; 226 enum reconf_action reconf_action; 227 enum role remote_role; 228 uint16_t short_as; 229 uint16_t holdtime; 230 uint16_t local_port; 231 uint16_t remote_port; 232 uint8_t depend_ok; 233 uint8_t demoted; 234 uint8_t passive; 235 uint8_t throttled; 236 uint8_t rpending; 237 }; 238 239 extern time_t pauseaccept; 240 241 struct ctl_timer { 242 enum Timer type; 243 time_t val; 244 }; 245 246 /* carp.c */ 247 int carp_demote_init(char *, int); 248 void carp_demote_shutdown(void); 249 int carp_demote_get(char *); 250 int carp_demote_set(char *, int); 251 252 /* config.c */ 253 void merge_config(struct bgpd_config *, struct bgpd_config *); 254 void free_deleted_peers(struct bgpd_config *); 255 int prepare_listeners(struct bgpd_config *); 256 257 /* control.c */ 258 int control_check(char *); 259 int control_init(int, char *); 260 int control_listen(int); 261 size_t control_fill_pfds(struct pollfd *, size_t); 262 void control_shutdown(int); 263 int control_dispatch_msg(struct pollfd *, struct peer_head *); 264 unsigned int control_accept(int, int); 265 266 /* log.c */ 267 char *log_fmt_peer(const struct peer_config *); 268 void log_statechange(struct peer *, enum session_state, 269 enum session_events); 270 void log_notification(const struct peer *, uint8_t, uint8_t, 271 const struct ibuf *, const char *); 272 void log_conn_attempt(const struct peer *, struct sockaddr *, 273 socklen_t); 274 275 /* mrt.c */ 276 void mrt_dump_bgp_msg(struct mrt *, void *, uint16_t, 277 struct peer *, enum msg_type); 278 void mrt_dump_state(struct mrt *, uint16_t, uint16_t, 279 struct peer *); 280 void mrt_done(struct mrt *); 281 282 /* pfkey.c */ 283 struct sadb_msg; 284 int pfkey_read(int, struct sadb_msg *); 285 int pfkey_establish(struct auth_state *, struct auth_config *, 286 const struct bgpd_addr *, const struct bgpd_addr *); 287 int pfkey_remove(struct auth_state *); 288 int pfkey_init(void); 289 int pfkey_send_conf(struct imsgbuf *, uint32_t, struct auth_config *); 290 int pfkey_recv_conf(struct peer *, struct imsg *); 291 int tcp_md5_check(int, struct auth_config *); 292 int tcp_md5_set(int, struct auth_config *, struct bgpd_addr *); 293 int tcp_md5_prep_listener(struct listen_addr *, struct peer_head *); 294 void tcp_md5_add_listener(struct bgpd_config *, struct peer *); 295 void tcp_md5_del_listener(struct bgpd_config *, struct peer *); 296 297 /* printconf.c */ 298 void print_config(struct bgpd_config *, struct rib_names *); 299 300 /* rde.c */ 301 void rde_main(int, int); 302 303 /* rtr_proto.c */ 304 struct rtr_session; 305 size_t rtr_count(void); 306 void rtr_check_events(struct pollfd *, size_t); 307 size_t rtr_poll_events(struct pollfd *, size_t, time_t *); 308 struct rtr_session *rtr_new(uint32_t, struct rtr_config_msg *); 309 struct rtr_session *rtr_get(uint32_t); 310 void rtr_free(struct rtr_session *); 311 void rtr_open(struct rtr_session *, int); 312 void rtr_config_prep(void); 313 void rtr_config_merge(void); 314 void rtr_config_keep(struct rtr_session *, 315 struct rtr_config_msg *); 316 void rtr_roa_merge(struct roa_tree *); 317 void rtr_aspa_merge(struct aspa_tree *); 318 void rtr_shutdown(void); 319 void rtr_show(struct rtr_session *, pid_t); 320 321 /* rtr.c */ 322 void rtr_sem_acquire(int); 323 void rtr_sem_release(int); 324 void rtr_roa_insert(struct roa_tree *, struct roa *); 325 void rtr_aspa_insert(struct aspa_tree *, struct aspa_set *); 326 void rtr_main(int, int); 327 void rtr_imsg_compose(int, uint32_t, pid_t, void *, size_t); 328 void rtr_recalc(void); 329 330 /* session.c */ 331 RB_PROTOTYPE(peer_head, peer, entry, peer_compare); 332 333 void session_main(int, int); 334 void bgp_fsm(struct peer *, enum session_events); 335 int session_neighbor_rrefresh(struct peer *p); 336 struct peer *getpeerbydesc(struct bgpd_config *, const char *); 337 struct peer *getpeerbyip(struct bgpd_config *, struct sockaddr *); 338 struct peer *getpeerbyid(struct bgpd_config *, uint32_t); 339 int peer_matched(struct peer *, struct ctl_neighbor *); 340 int imsg_ctl_parent(struct imsg *); 341 int imsg_ctl_rde(struct imsg *); 342 int imsg_ctl_rde_msg(int, uint32_t, pid_t); 343 void session_stop(struct peer *, uint8_t, const char *); 344 struct bgpd_addr *session_localaddr(struct peer *); 345 346 /* timer.c */ 347 struct timer *timer_get(struct timer_head *, enum Timer); 348 struct timer *timer_nextisdue(struct timer_head *, time_t); 349 time_t timer_nextduein(struct timer_head *, time_t); 350 int timer_running(struct timer_head *, enum Timer, time_t *); 351 void timer_set(struct timer_head *, enum Timer, u_int); 352 void timer_stop(struct timer_head *, enum Timer); 353 void timer_remove(struct timer_head *, enum Timer); 354 void timer_remove_all(struct timer_head *); 355