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/* $OpenBSD: session.h,v 1.155 2022/06/15 14:09:30 claudio Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <time.h>
#define MAX_BACKLOG 5
#define INTERVAL_CONNECTRETRY 120
#define INTERVAL_HOLD_INITIAL 240
#define INTERVAL_HOLD 90
#define INTERVAL_IDLE_HOLD_INITIAL 30
#define INTERVAL_HOLD_CLONED 3600
#define INTERVAL_HOLD_DEMOTED 60
#define MAX_IDLE_HOLD 3600
#define MSGSIZE_HEADER 19
#define MSGSIZE_HEADER_MARKER 16
#define MSGSIZE_NOTIFICATION_MIN 21 /* 19 hdr + 1 code + 1 sub */
#define MSGSIZE_OPEN_MIN 29
#define MSGSIZE_UPDATE_MIN 23
#define MSGSIZE_KEEPALIVE MSGSIZE_HEADER
#define MSGSIZE_RREFRESH (MSGSIZE_HEADER + 4)
#define MSGSIZE_RREFRESH_MIN MSGSIZE_RREFRESH
#define MSG_PROCESS_LIMIT 25
#define SESSION_CLEAR_DELAY 5
enum session_state {
STATE_NONE,
STATE_IDLE,
STATE_CONNECT,
STATE_ACTIVE,
STATE_OPENSENT,
STATE_OPENCONFIRM,
STATE_ESTABLISHED
};
enum session_events {
EVNT_NONE,
EVNT_START,
EVNT_STOP,
EVNT_CON_OPEN,
EVNT_CON_CLOSED,
EVNT_CON_OPENFAIL,
EVNT_CON_FATAL,
EVNT_TIMER_CONNRETRY,
EVNT_TIMER_HOLDTIME,
EVNT_TIMER_KEEPALIVE,
EVNT_TIMER_SENDHOLD,
EVNT_RCVD_OPEN,
EVNT_RCVD_KEEPALIVE,
EVNT_RCVD_UPDATE,
EVNT_RCVD_NOTIFICATION
};
enum msg_type {
OPEN = 1,
UPDATE,
NOTIFICATION,
KEEPALIVE,
RREFRESH
};
enum suberr_header {
ERR_HDR_SYNC = 1,
ERR_HDR_LEN,
ERR_HDR_TYPE
};
enum suberr_open {
ERR_OPEN_VERSION = 1,
ERR_OPEN_AS,
ERR_OPEN_BGPID,
ERR_OPEN_OPT,
ERR_OPEN_AUTH,
ERR_OPEN_HOLDTIME,
ERR_OPEN_CAPA,
ERR_OPEN_GROUP_CONFLICT, /* draft-ietf-idr-bgp-multisession-07 */
ERR_OPEN_GROUP_REQUIRED /* draft-ietf-idr-bgp-multisession-07 */
};
enum suberr_fsm {
ERR_FSM_UNSPECIFIC = 0,
ERR_FSM_UNEX_OPENSENT,
ERR_FSM_UNEX_OPENCONFIRM,
ERR_FSM_UNEX_ESTABLISHED
};
enum opt_params {
OPT_PARAM_NONE,
OPT_PARAM_AUTH,
OPT_PARAM_CAPABILITIES,
OPT_PARAM_EXT_LEN=255,
};
enum capa_codes {
CAPA_NONE = 0,
CAPA_MP = 1,
CAPA_REFRESH = 2,
CAPA_RESTART = 64,
CAPA_AS4BYTE = 65,
CAPA_ADD_PATH = 69,
CAPA_ENHANCED_RR = 70,
};
struct bgp_msg {
struct ibuf *buf;
enum msg_type type;
uint16_t len;
};
struct msg_header {
u_char marker[MSGSIZE_HEADER_MARKER];
uint16_t len;
uint8_t type;
};
struct msg_open {
struct msg_header header;
uint32_t bgpid;
uint16_t myas;
uint16_t holdtime;
uint8_t version;
uint8_t optparamlen;
};
struct bgpd_sysdep {
uint8_t no_pfkey;
uint8_t no_md5sig;
};
struct ctl_conn {
TAILQ_ENTRY(ctl_conn) entry;
struct imsgbuf ibuf;
int restricted;
int throttled;
int terminate;
};
struct peer_stats {
unsigned long long msg_rcvd_open;
unsigned long long msg_rcvd_update;
unsigned long long msg_rcvd_notification;
unsigned long long msg_rcvd_keepalive;
unsigned long long msg_rcvd_rrefresh;
unsigned long long msg_sent_open;
unsigned long long msg_sent_update;
unsigned long long msg_sent_notification;
unsigned long long msg_sent_keepalive;
unsigned long long msg_sent_rrefresh;
unsigned long long refresh_rcvd_req;
unsigned long long refresh_rcvd_borr;
unsigned long long refresh_rcvd_eorr;
unsigned long long refresh_sent_req;
unsigned long long refresh_sent_borr;
unsigned long long refresh_sent_eorr;
unsigned long long prefix_rcvd_update;
unsigned long long prefix_rcvd_withdraw;
unsigned long long prefix_rcvd_eor;
unsigned long long prefix_sent_update;
unsigned long long prefix_sent_withdraw;
unsigned long long prefix_sent_eor;
time_t last_updown;
time_t last_read;
time_t last_write;
uint32_t prefix_cnt;
uint32_t prefix_out_cnt;
uint8_t last_sent_errcode;
uint8_t last_sent_suberr;
uint8_t last_rcvd_errcode;
uint8_t last_rcvd_suberr;
char last_reason[REASON_LEN];
};
enum Timer {
Timer_None,
Timer_ConnectRetry,
Timer_Keepalive,
Timer_Hold,
Timer_SendHold,
Timer_IdleHold,
Timer_IdleHoldReset,
Timer_CarpUndemote,
Timer_RestartTimeout,
Timer_Rtr_Refresh,
Timer_Rtr_Retry,
Timer_Rtr_Expire,
Timer_Max
};
struct timer {
TAILQ_ENTRY(timer) entry;
enum Timer type;
time_t val;
};
TAILQ_HEAD(timer_head, timer);
struct peer {
struct peer_config conf;
struct peer_stats stats;
RB_ENTRY(peer) entry;
struct {
struct capabilities ann;
struct capabilities peer;
struct capabilities neg;
} capa;
struct {
struct bgpd_addr local_addr;
uint32_t spi_in;
uint32_t spi_out;
enum auth_method method;
uint8_t established;
} auth;
struct bgpd_addr local;
struct bgpd_addr local_alt;
struct bgpd_addr remote;
struct timer_head timers;
struct msgbuf wbuf;
struct ibuf_read *rbuf;
struct peer *template;
int fd;
int lasterr;
u_int errcnt;
u_int IdleHoldTime;
uint32_t remote_bgpid;
enum session_state state;
enum session_state prev_state;
enum reconf_action reconf_action;
uint16_t short_as;
uint16_t holdtime;
uint16_t local_port;
uint16_t remote_port;
uint8_t depend_ok;
uint8_t demoted;
uint8_t passive;
uint8_t throttled;
uint8_t rpending;
};
extern time_t pauseaccept;
struct ctl_timer {
enum Timer type;
time_t val;
};
/* carp.c */
int carp_demote_init(char *, int);
void carp_demote_shutdown(void);
int carp_demote_get(char *);
int carp_demote_set(char *, int);
/* config.c */
void merge_config(struct bgpd_config *, struct bgpd_config *);
int prepare_listeners(struct bgpd_config *);
/* control.c */
int control_check(char *);
int control_init(int, char *);
int control_listen(int);
size_t control_fill_pfds(struct pollfd *, size_t);
void control_shutdown(int);
int control_dispatch_msg(struct pollfd *, struct peer_head *);
unsigned int control_accept(int, int);
/* log.c */
char *log_fmt_peer(const struct peer_config *);
void log_statechange(struct peer *, enum session_state,
enum session_events);
void log_notification(const struct peer *, uint8_t, uint8_t,
u_char *, uint16_t, const char *);
void log_conn_attempt(const struct peer *, struct sockaddr *,
socklen_t);
/* mrt.c */
void mrt_dump_bgp_msg(struct mrt *, void *, uint16_t,
struct peer *, enum msg_type);
void mrt_dump_state(struct mrt *, uint16_t, uint16_t,
struct peer *);
void mrt_done(struct mrt *);
/* pfkey.c */
struct sadb_msg;
int pfkey_read(int, struct sadb_msg *);
int pfkey_establish(struct peer *);
int pfkey_remove(struct peer *);
int pfkey_init(void);
int tcp_md5_check(int, struct peer *);
int tcp_md5_set(int, struct peer *);
int tcp_md5_prep_listener(struct listen_addr *, struct peer_head *);
void tcp_md5_add_listener(struct bgpd_config *, struct peer *);
void tcp_md5_del_listener(struct bgpd_config *, struct peer *);
/* printconf.c */
void print_config(struct bgpd_config *, struct rib_names *);
/* rde.c */
void rde_main(int, int);
/* rtr_proto.c */
struct rtr_session;
size_t rtr_count(void);
void rtr_check_events(struct pollfd *, size_t);
size_t rtr_poll_events(struct pollfd *, size_t, time_t *);
struct rtr_session *rtr_new(uint32_t, char *);
struct rtr_session *rtr_get(uint32_t);
void rtr_free(struct rtr_session *);
void rtr_open(struct rtr_session *, int);
struct roa_tree *rtr_get_roa(struct rtr_session *);
void rtr_config_prep(void);
void rtr_config_merge(void);
void rtr_config_keep(struct rtr_session *);
void rtr_roa_merge(struct roa_tree *);
void rtr_shutdown(void);
void rtr_show(struct rtr_session *, pid_t);
/* rtr.c */
void roa_insert(struct roa_tree *, struct roa *);
void rtr_main(int, int);
void rtr_imsg_compose(int, uint32_t, pid_t, void *, size_t);
void rtr_recalc(void);
/* session.c */
RB_PROTOTYPE(peer_head, peer, entry, peer_compare);
void session_main(int, int);
void bgp_fsm(struct peer *, enum session_events);
int session_neighbor_rrefresh(struct peer *p);
struct peer *getpeerbydesc(struct bgpd_config *, const char *);
struct peer *getpeerbyip(struct bgpd_config *, struct sockaddr *);
struct peer *getpeerbyid(struct bgpd_config *, uint32_t);
int peer_matched(struct peer *, struct ctl_neighbor *);
int imsg_ctl_parent(int, uint32_t, pid_t, void *, uint16_t);
int imsg_ctl_rde(int, pid_t, void *, uint16_t);
void session_stop(struct peer *, uint8_t);
/* timer.c */
struct timer *timer_get(struct timer_head *, enum Timer);
struct timer *timer_nextisdue(struct timer_head *, time_t);
time_t timer_nextduein(struct timer_head *, time_t);
int timer_running(struct timer_head *, enum Timer, time_t *);
void timer_set(struct timer_head *, enum Timer, u_int);
void timer_stop(struct timer_head *, enum Timer);
void timer_remove(struct timer_head *, enum Timer);
void timer_remove_all(struct timer_head *);
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