1 /* $OpenBSD: session.h,v 1.170 2024/05/18 11:17:30 jsg 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 prefix_cnt; 155 uint32_t prefix_out_cnt; 156 uint32_t pending_update; 157 uint32_t pending_withdraw; 158 uint8_t last_sent_errcode; 159 uint8_t last_sent_suberr; 160 uint8_t last_rcvd_errcode; 161 uint8_t last_rcvd_suberr; 162 char last_reason[REASON_LEN]; 163 }; 164 165 enum Timer { 166 Timer_None, 167 Timer_ConnectRetry, 168 Timer_Keepalive, 169 Timer_Hold, 170 Timer_SendHold, 171 Timer_IdleHold, 172 Timer_IdleHoldReset, 173 Timer_CarpUndemote, 174 Timer_RestartTimeout, 175 Timer_Rtr_Refresh, 176 Timer_Rtr_Retry, 177 Timer_Rtr_Expire, 178 Timer_Rtr_Active, 179 Timer_Max 180 }; 181 182 struct timer { 183 TAILQ_ENTRY(timer) entry; 184 enum Timer type; 185 time_t val; 186 }; 187 188 TAILQ_HEAD(timer_head, timer); 189 190 struct peer { 191 struct peer_config conf; 192 struct peer_stats stats; 193 RB_ENTRY(peer) entry; 194 struct { 195 struct capabilities ann; 196 struct capabilities peer; 197 struct capabilities neg; 198 } capa; 199 struct { 200 struct bgpd_addr local_addr; 201 uint32_t spi_in; 202 uint32_t spi_out; 203 enum auth_method method; 204 uint8_t established; 205 } auth; 206 struct bgpd_addr local; 207 struct bgpd_addr local_alt; 208 struct bgpd_addr remote; 209 struct timer_head timers; 210 struct msgbuf wbuf; 211 struct ibuf_read *rbuf; 212 struct peer *template; 213 int fd; 214 int lasterr; 215 u_int errcnt; 216 u_int IdleHoldTime; 217 unsigned int if_scope; /* interface scope for IPv6 */ 218 uint32_t remote_bgpid; 219 enum session_state state; 220 enum session_state prev_state; 221 enum reconf_action reconf_action; 222 enum role remote_role; 223 uint16_t short_as; 224 uint16_t holdtime; 225 uint16_t local_port; 226 uint16_t remote_port; 227 uint8_t depend_ok; 228 uint8_t demoted; 229 uint8_t passive; 230 uint8_t throttled; 231 uint8_t rpending; 232 }; 233 234 extern time_t pauseaccept; 235 236 struct ctl_timer { 237 enum Timer type; 238 time_t val; 239 }; 240 241 /* carp.c */ 242 int carp_demote_init(char *, int); 243 void carp_demote_shutdown(void); 244 int carp_demote_get(char *); 245 int carp_demote_set(char *, int); 246 247 /* config.c */ 248 void merge_config(struct bgpd_config *, struct bgpd_config *); 249 int prepare_listeners(struct bgpd_config *); 250 251 /* control.c */ 252 int control_check(char *); 253 int control_init(int, char *); 254 int control_listen(int); 255 size_t control_fill_pfds(struct pollfd *, size_t); 256 void control_shutdown(int); 257 int control_dispatch_msg(struct pollfd *, struct peer_head *); 258 unsigned int control_accept(int, int); 259 260 /* log.c */ 261 char *log_fmt_peer(const struct peer_config *); 262 void log_statechange(struct peer *, enum session_state, 263 enum session_events); 264 void log_notification(const struct peer *, uint8_t, uint8_t, 265 const struct ibuf *, const char *); 266 void log_conn_attempt(const struct peer *, struct sockaddr *, 267 socklen_t); 268 269 /* mrt.c */ 270 void mrt_dump_bgp_msg(struct mrt *, void *, uint16_t, 271 struct peer *, enum msg_type); 272 void mrt_dump_state(struct mrt *, uint16_t, uint16_t, 273 struct peer *); 274 void mrt_done(struct mrt *); 275 276 /* pfkey.c */ 277 struct sadb_msg; 278 int pfkey_read(int, struct sadb_msg *); 279 int pfkey_establish(struct peer *); 280 int pfkey_remove(struct peer *); 281 int pfkey_init(void); 282 int tcp_md5_check(int, struct peer *); 283 int tcp_md5_set(int, struct peer *); 284 int tcp_md5_prep_listener(struct listen_addr *, struct peer_head *); 285 void tcp_md5_add_listener(struct bgpd_config *, struct peer *); 286 void tcp_md5_del_listener(struct bgpd_config *, struct peer *); 287 288 /* printconf.c */ 289 void print_config(struct bgpd_config *, struct rib_names *); 290 291 /* rde.c */ 292 void rde_main(int, int); 293 294 /* rtr_proto.c */ 295 struct rtr_session; 296 size_t rtr_count(void); 297 void rtr_check_events(struct pollfd *, size_t); 298 size_t rtr_poll_events(struct pollfd *, size_t, time_t *); 299 struct rtr_session *rtr_new(uint32_t, char *); 300 struct rtr_session *rtr_get(uint32_t); 301 void rtr_free(struct rtr_session *); 302 void rtr_open(struct rtr_session *, int); 303 void rtr_config_prep(void); 304 void rtr_config_merge(void); 305 void rtr_config_keep(struct rtr_session *); 306 void rtr_roa_merge(struct roa_tree *); 307 void rtr_aspa_merge(struct aspa_tree *); 308 void rtr_shutdown(void); 309 void rtr_show(struct rtr_session *, pid_t); 310 311 /* rtr.c */ 312 void rtr_sem_acquire(int); 313 void rtr_sem_release(int); 314 void rtr_roa_insert(struct roa_tree *, struct roa *); 315 void rtr_aspa_insert(struct aspa_tree *, struct aspa_set *); 316 void rtr_main(int, int); 317 void rtr_imsg_compose(int, uint32_t, pid_t, void *, size_t); 318 void rtr_recalc(void); 319 320 /* session.c */ 321 RB_PROTOTYPE(peer_head, peer, entry, peer_compare); 322 323 void session_main(int, int); 324 void bgp_fsm(struct peer *, enum session_events); 325 int session_neighbor_rrefresh(struct peer *p); 326 struct peer *getpeerbydesc(struct bgpd_config *, const char *); 327 struct peer *getpeerbyip(struct bgpd_config *, struct sockaddr *); 328 struct peer *getpeerbyid(struct bgpd_config *, uint32_t); 329 int peer_matched(struct peer *, struct ctl_neighbor *); 330 int imsg_ctl_parent(struct imsg *); 331 int imsg_ctl_rde(struct imsg *); 332 int imsg_ctl_rde_msg(int, uint32_t, pid_t); 333 void session_stop(struct peer *, uint8_t, const char *); 334 335 /* timer.c */ 336 struct timer *timer_get(struct timer_head *, enum Timer); 337 struct timer *timer_nextisdue(struct timer_head *, time_t); 338 time_t timer_nextduein(struct timer_head *, time_t); 339 int timer_running(struct timer_head *, enum Timer, time_t *); 340 void timer_set(struct timer_head *, enum Timer, u_int); 341 void timer_stop(struct timer_head *, enum Timer); 342 void timer_remove(struct timer_head *, enum Timer); 343 void timer_remove_all(struct timer_head *); 344