/*	$OpenBSD: bgpd.h,v 1.160 2005/03/23 10:46:26 henning 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.
 */
#ifndef __BGPD_H__
#define	__BGPD_H__

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <net/pfkeyv2.h>

#include <poll.h>
#include <stdarg.h>

#define	BGP_VERSION			4
#define	BGP_PORT			179
#define	CONFFILE			"/etc/bgpd.conf"
#define	BGPD_USER			"_bgpd"
#define	PEER_DESCR_LEN			32
#define	PFTABLE_LEN			16
#define	TCP_MD5_KEY_LEN			80
#define	IPSEC_ENC_KEY_LEN		32
#define	IPSEC_AUTH_KEY_LEN		20

#define	MAX_PKTSIZE			4096
#define	MIN_HOLDTIME			3
#define	READ_BUF_SIZE			65535
#define	RT_BUF_SIZE			16384
#define	MAX_RTSOCK_BUF			128 * 1024

#define	BGPD_OPT_VERBOSE		0x0001
#define	BGPD_OPT_VERBOSE2		0x0002
#define	BGPD_OPT_NOACTION		0x0004

#define	BGPD_FLAG_NO_FIB_UPDATE		0x0001
#define	BGPD_FLAG_NO_EVALUATE		0x0002
#define	BGPD_FLAG_REFLECTOR		0x0004
#define	BGPD_FLAG_DECISION_MASK		0x0f00
#define	BGPD_FLAG_DECISION_ROUTEAGE	0x0100
#define	BGPD_FLAG_DECISION_TRANS_AS	0x0200

#define	BGPD_LOG_UPDATES		0x0001

#define	SOCKET_NAME			"/var/run/bgpd.sock"

#define	F_BGPD_INSERTED		0x0001
#define	F_KERNEL		0x0002
#define	F_CONNECTED		0x0004
#define	F_NEXTHOP		0x0008
#define	F_DOWN			0x0010
#define	F_STATIC		0x0020
#define	F_LONGER		0x0040
#define	F_REJECT		0x0080
#define	F_BLACKHOLE		0x0100

enum {
	PROC_MAIN,
	PROC_SE,
	PROC_RDE
} bgpd_process;

enum reconf_action {
	RECONF_NONE,
	RECONF_KEEP,
	RECONF_REINIT,
	RECONF_DELETE
};

struct buf {
	TAILQ_ENTRY(buf)	 entry;
	u_char			*buf;
	size_t			 size;
	size_t			 wpos;
	size_t			 rpos;
	int			 fd;
};

struct msgbuf {
	TAILQ_HEAD(bufs, buf)	 bufs;
	u_int32_t		 queued;
	int			 fd;
};

struct bgpd_addr {
	sa_family_t	af;
	union {
		struct in_addr		v4;
		struct in6_addr		v6;
		u_int8_t		addr8[16];
		u_int16_t		addr16[8];
		u_int32_t		addr32[4];
	} ba;		    /* 128-bit address */
	u_int32_t	scope_id;	/* iface scope id for v6 */
#define	v4	ba.v4
#define	v6	ba.v6
#define	addr8	ba.addr8
#define	addr16	ba.addr16
#define	addr32	ba.addr32
};

#define	DEFAULT_LISTENER	0x01
#define	LISTENER_LISTENING	0x02

struct listen_addr {
	TAILQ_ENTRY(listen_addr)	 entry;
	struct sockaddr_storage		 sa;
	int				 fd;
	enum reconf_action		 reconf;
	u_int8_t			 flags;
};

TAILQ_HEAD(listen_addrs, listen_addr);

struct bgpd_config {
	struct listen_addrs			*listen_addrs;
	int					 opts;
	int					 flags;
	int					 log;
	u_int32_t				 bgpid;
	u_int32_t				 clusterid;
	u_int16_t				 as;
	u_int16_t				 holdtime;
	u_int16_t				 min_holdtime;
};

struct buf_read {
	u_char			 buf[READ_BUF_SIZE];
	u_char			*rptr;
	size_t			 wpos;
};

enum announce_type {
	ANNOUNCE_UNDEF,
	ANNOUNCE_SELF,
	ANNOUNCE_NONE,
	ANNOUNCE_DEFAULT_ROUTE,
	ANNOUNCE_ALL
};

enum enforce_as {
	ENFORCE_AS_UNDEF,
	ENFORCE_AS_OFF,
	ENFORCE_AS_ON
};

enum auth_method {
	AUTH_NONE,
	AUTH_MD5SIG,
	AUTH_IPSEC_MANUAL_ESP,
	AUTH_IPSEC_MANUAL_AH,
	AUTH_IPSEC_IKE_ESP,
	AUTH_IPSEC_IKE_AH
};

struct peer_auth {
	char			md5key[TCP_MD5_KEY_LEN];
	char			auth_key_in[IPSEC_AUTH_KEY_LEN];
	char			auth_key_out[IPSEC_AUTH_KEY_LEN];
	char			enc_key_in[IPSEC_ENC_KEY_LEN];
	char			enc_key_out[IPSEC_ENC_KEY_LEN];
	u_int32_t		spi_in;
	u_int32_t		spi_out;
	enum auth_method	method;
	u_int8_t		md5key_len;
	u_int8_t		auth_alg_in;
	u_int8_t		auth_alg_out;
	u_int8_t		auth_keylen_in;
	u_int8_t		auth_keylen_out;
	u_int8_t		enc_alg_in;
	u_int8_t		enc_alg_out;
	u_int8_t		enc_keylen_in;
	u_int8_t		enc_keylen_out;
};

struct capabilities {
	u_int8_t	mp_v4;		/* multiprotocol extensions, RFC 2858 */
	u_int8_t	mp_v6;
	u_int8_t	refresh;	/* route refresh, RFC 2918 */
};

SIMPLEQ_HEAD(filter_set_head, filter_set);

struct peer_config {
	struct bgpd_addr	 remote_addr;
	struct bgpd_addr	 local_addr;
	struct peer_auth	 auth;
	struct capabilities	 capabilities;
	struct filter_set_head	 attrset;
	char			 group[PEER_DESCR_LEN];
	char			 descr[PEER_DESCR_LEN];
	char			 if_depend[IFNAMSIZ];
	u_int32_t		 id;
	u_int32_t		 groupid;
	u_int32_t		 max_prefix;
	enum announce_type	 announce_type;
	enum enforce_as		 enforce_as;
	enum reconf_action	 reconf_action;
	u_int16_t		 remote_as;
	u_int16_t		 holdtime;
	u_int16_t		 min_holdtime;
	u_int8_t		 template;
	u_int8_t		 remote_masklen;
	u_int8_t		 cloned;
	u_int8_t		 ebgp;		/* 1 = ebgp, 0 = ibgp */
	u_int8_t		 distance;	/* 1 = direct, >1 = multihop */
	u_int8_t		 passive;
	u_int8_t		 announce_capa;
	u_int8_t		 reflector_client;
};

struct network_config {
	struct bgpd_addr	prefix;
	struct filter_set_head	attrset;
	u_int8_t		prefixlen;
};

TAILQ_HEAD(network_head, network);

struct network {
	struct network_config	net;
	TAILQ_ENTRY(network)	entry;
};

/* ipc messages */

#define	IMSG_HEADER_SIZE	sizeof(struct imsg_hdr)
#define	MAX_IMSGSIZE		8192

struct imsg_fd {
	TAILQ_ENTRY(imsg_fd)	entry;
	int			fd;
};

struct imsgbuf {
	TAILQ_HEAD(fds, imsg_fd)	fds;
	struct buf_read			r;
	struct msgbuf			w;
	int				fd;
	pid_t				pid;
};

enum imsg_type {
	IMSG_NONE,
	IMSG_RECONF_CONF,
	IMSG_RECONF_PEER,
	IMSG_RECONF_FILTER,
	IMSG_RECONF_LISTENER,
	IMSG_RECONF_DONE,
	IMSG_UPDATE,
	IMSG_UPDATE_ERR,
	IMSG_SESSION_ADD,
	IMSG_SESSION_UP,
	IMSG_SESSION_DOWN,
	IMSG_MRT_OPEN,
	IMSG_MRT_REOPEN,
	IMSG_MRT_CLOSE,
	IMSG_KROUTE_CHANGE,
	IMSG_KROUTE_DELETE,
	IMSG_NEXTHOP_ADD,
	IMSG_NEXTHOP_REMOVE,
	IMSG_NEXTHOP_UPDATE,
	IMSG_PFTABLE_ADD,
	IMSG_PFTABLE_REMOVE,
	IMSG_PFTABLE_COMMIT,
	IMSG_NETWORK_ADD,
	IMSG_NETWORK_REMOVE,
	IMSG_NETWORK_FLUSH,
	IMSG_NETWORK_DONE,
	IMSG_FILTER_SET,
	IMSG_CTL_SHOW_NEIGHBOR,
	IMSG_CTL_END,
	IMSG_CTL_RELOAD,
	IMSG_CTL_FIB_COUPLE,
	IMSG_CTL_FIB_DECOUPLE,
	IMSG_CTL_NEIGHBOR_UP,
	IMSG_CTL_NEIGHBOR_DOWN,
	IMSG_CTL_NEIGHBOR_CLEAR,
	IMSG_CTL_KROUTE,
	IMSG_CTL_KROUTE_ADDR,
	IMSG_CTL_SHOW_NEXTHOP,
	IMSG_CTL_SHOW_INTERFACE,
	IMSG_CTL_SHOW_RIB,
	IMSG_CTL_SHOW_RIB_AS,
	IMSG_CTL_SHOW_RIB_PREFIX,
	IMSG_CTL_SHOW_NETWORK,
	IMSG_REFRESH,
	IMSG_IFINFO
};

struct imsg_hdr {
	u_int32_t	peerid;
	pid_t		pid;
	enum imsg_type	type;
	u_int16_t	len;
};

struct imsg {
	struct imsg_hdr	 hdr;
	void		*data;
};

/* needed for session.h parse prototype */
LIST_HEAD(mrt_head, mrt);

/* error codes and subcodes needed in SE and RDE */
enum err_codes {
	ERR_HEADER = 1,
	ERR_OPEN,
	ERR_UPDATE,
	ERR_HOLDTIMEREXPIRED,
	ERR_FSM,
	ERR_CEASE
};

enum suberr_update {
	ERR_UPD_UNSPECIFIC,
	ERR_UPD_ATTRLIST,
	ERR_UPD_UNKNWN_WK_ATTR,
	ERR_UPD_MISSNG_WK_ATTR,
	ERR_UPD_ATTRFLAGS,
	ERR_UPD_ATTRLEN,
	ERR_UPD_ORIGIN,
	ERR_UPD_LOOP,
	ERR_UPD_NEXTHOP,
	ERR_UPD_OPTATTR,
	ERR_UPD_NETWORK,
	ERR_UPD_ASPATH
};

enum suberr_cease {
	ERR_CEASE_MAX_PREFIX = 1,
	ERR_CEASE_ADMIN_DOWN,
	ERR_CEASE_PEER_UNCONF,
	ERR_CEASE_ADMIN_RESET,
	ERR_CEASE_CONN_REJECT,
	ERR_CEASE_OTHER_CHANGE,
	ERR_CEASE_COLLISION,
	ERR_CEASE_RSRC_EXHAUST
};

struct kroute {
	struct in_addr	prefix;
	struct in_addr	nexthop;
	u_int16_t	flags;
	u_short		ifindex;
	u_int8_t	prefixlen;
};

struct kroute6 {
	struct in6_addr	prefix;
	struct in6_addr	nexthop;
	u_int16_t	flags;
	u_short		ifindex;
	u_int8_t	prefixlen;
};

struct kroute_nexthop {
	union {
		struct kroute		kr4;
		struct kroute6		kr6;
	} kr;
	struct bgpd_addr	nexthop;
	struct bgpd_addr	gateway;
	u_int8_t		valid;
	u_int8_t		connected;
};

struct kif {
	char			 ifname[IFNAMSIZ];
	u_long			 baudrate;
	int			 flags;
	u_short			 ifindex;
	u_int8_t		 media_type;
	u_int8_t		 link_state;
	u_int8_t		 nh_reachable;	/* for nexthop verification */
};

struct session_up {
	struct bgpd_addr	local_addr;
	struct bgpd_addr	remote_addr;
	struct capabilities	capa_announced;
	struct capabilities	capa_received;
	u_int32_t		remote_bgpid;
};

struct pftable_msg {
	struct bgpd_addr	addr;
	char			pftable[PFTABLE_LEN];
	u_int8_t		len;
};

struct ctl_show_nexthop {
	struct bgpd_addr	addr;
	u_int8_t		valid;
	struct kif		kif;
};

struct ctl_neighbor {
	struct bgpd_addr	addr;
	char			descr[PEER_DESCR_LEN];
};

#define	F_RIB_ELIGIBLE	0x01
#define	F_RIB_ACTIVE	0x02
#define	F_RIB_INTERNAL	0x04
#define	F_RIB_ANNOUNCE	0x08

struct ctl_show_rib {
	struct bgpd_addr	nexthop;
	struct bgpd_addr	prefix;
	time_t			lastchange;
	u_int32_t		local_pref;
	u_int32_t		med;
	u_int16_t		prefix_cnt;
	u_int16_t		active_cnt;
	u_int16_t		aspath_len;
	u_int8_t		prefixlen;
	u_int8_t		origin;
	u_int8_t		flags;
	/* plus a aspath_len bytes long aspath */
};

struct ctl_show_rib_prefix {
	struct bgpd_addr	prefix;
	time_t			lastchange;
	u_int8_t		prefixlen;
	u_int8_t		flags;
};

enum as_spec {
	AS_NONE,
	AS_ALL,
	AS_SOURCE,
	AS_TRANSIT,
	AS_EMPTY
};

struct filter_as {
	enum as_spec	type;
	u_int16_t	as;
};

enum filter_actions {
	ACTION_NONE,
	ACTION_ALLOW,
	ACTION_DENY
};

enum directions {
	DIR_IN = 1,
	DIR_OUT,
	DIR_DEFAULT_IN,		/* only needed to apply default set */
	DIR_DEFAULT_OUT
};

enum from_spec {
	FROM_ALL,
	FROM_ADDRESS,
	FROM_DESCR,
	FROM_GROUP
};

enum comp_ops {
	OP_NONE,
	OP_RANGE,
	OP_XRANGE,
	OP_EQ,
	OP_NE,
	OP_LE,
	OP_LT,
	OP_GE,
	OP_GT
};

struct filter_peers {
	u_int32_t	peerid;
	u_int32_t	groupid;
};

/* special community type */
#define	COMMUNITY_ERROR			-1
#define	COMMUNITY_ANY			-2
#define	COMMUNITY_WELLKNOWN		0xffff
#define	COMMUNITY_NO_EXPORT		0xff01
#define	COMMUNITY_NO_ADVERTISE		0xff02
#define	COMMUNITY_NO_EXPSUBCONFED	0xff03
#define	COMMUNITY_NO_PEER		0xff04	/* rfc3765 */

struct filter_prefix {
	struct bgpd_addr	addr;
	u_int8_t		len;
};

struct filter_prefixlen {
	enum comp_ops		op;
	sa_family_t		af;
	u_int8_t		len_min;
	u_int8_t		len_max;
};

struct filter_community {
	int			as;
	int			type;
};

struct filter_match {
	struct filter_prefix	prefix;
	struct filter_prefixlen	prefixlen;
	struct filter_as	as;
	struct filter_community	community;
};

TAILQ_HEAD(filter_head, filter_rule);

struct filter_rule {
	TAILQ_ENTRY(filter_rule)	entry;
	struct filter_peers		peer;
	struct filter_match		match;
	struct filter_set_head		set;
	enum filter_actions		action;
	enum directions			dir;
	u_int8_t			quick;
};

enum action_types {
	ACTION_SET_LOCALPREF,
	ACTION_SET_RELATIVE_LOCALPREF,
	ACTION_SET_MED,
	ACTION_SET_RELATIVE_MED,
	ACTION_SET_PREPEND_SELF,
	ACTION_SET_PREPEND_PEER,
	ACTION_SET_NEXTHOP,
	ACTION_SET_NEXTHOP_REJECT,
	ACTION_SET_NEXTHOP_BLACKHOLE,
	ACTION_SET_NEXTHOP_NOMODIFY,
	ACTION_SET_COMMUNITY,
/*	ACTION_SCRUB_COMMUNITY, */
	ACTION_PFTABLE
};

struct filter_set {
	SIMPLEQ_ENTRY(filter_set)	entry;
	union {
		u_int8_t		prepend;
		u_int32_t		metric;
		int32_t			relative;
		struct bgpd_addr	nexthop;
		struct filter_community	community;
		char			pftable[PFTABLE_LEN];
	} action;
	enum action_types		type;
};

struct rrefresh {
	u_int16_t	afi;
	u_int8_t	safi;
};

/* Address Family Numbers as per rfc1700 */
#define	AFI_IPv4	1
#define	AFI_IPv6	2
#define	AFI_ALL		0xffff

/* Subsequent Address Family Identifier as per rfc2858 */
#define	SAFI_NONE	0x00
#define	SAFI_UNICAST	0x01
#define	SAFI_MULTICAST	0x02
#define	SAFI_BOTH	0x03
#define	SAFI_ALL	0xff

/* prototypes */
/* bgpd.c */
void		 send_nexthop_update(struct kroute_nexthop *);
void		 send_imsg_session(int, pid_t, void *, u_int16_t);

/* buffer.c */
struct buf	*buf_open(size_t);
int		 buf_add(struct buf *, void *, size_t);
void		*buf_reserve(struct buf *, size_t);
int		 buf_close(struct msgbuf *, struct buf *);
int		 buf_write(int, struct buf *);
void		 buf_free(struct buf *);
void		 msgbuf_init(struct msgbuf *);
void		 msgbuf_clear(struct msgbuf *);
int		 msgbuf_write(struct msgbuf *);
int		 msgbuf_writebound(struct msgbuf *);
int		 msgbuf_unbounded(struct msgbuf *msgbuf);

/* log.c */
void		 log_init(int);
void		 vlog(int, const char *, va_list);
void		 log_peer_warn(const struct peer_config *, const char *, ...);
void		 log_peer_warnx(const struct peer_config *, const char *, ...);
void		 log_warn(const char *, ...);
void		 log_warnx(const char *, ...);
void		 log_info(const char *, ...);
void		 log_debug(const char *, ...);
void		 fatal(const char *);
void		 fatalx(const char *);
void		 fatal_ensure(const char *, int, const char *);
const char	*log_addr(const struct bgpd_addr *);

/* parse.y */
int	 cmdline_symset(char *);

/* config.c */
int	 check_file_secrecy(int, const char *);
int	 host(const char *, struct bgpd_addr *, u_int8_t *);

/* imsg.c */
void	 imsg_init(struct imsgbuf *, int);
int	 imsg_read(struct imsgbuf *);
int	 imsg_get(struct imsgbuf *, struct imsg *);
int	 imsg_compose(struct imsgbuf *, enum imsg_type, u_int32_t, pid_t, int,
	    void *, u_int16_t);
struct buf	*imsg_create(struct imsgbuf *, enum imsg_type, u_int32_t, pid_t,
		    u_int16_t);
int	 imsg_add(struct buf *, void *, u_int16_t);
int	 imsg_close(struct imsgbuf *, struct buf *);
void	 imsg_free(struct imsg *);
int	 imsg_get_fd(struct imsgbuf *);

/* kroute.c */
int		 kr_init(int);
int		 kr_change(struct kroute *);
int		 kr_delete(struct kroute *);
void		 kr_shutdown(void);
void		 kr_fib_couple(void);
void		 kr_fib_decouple(void);
int		 kr_dispatch_msg(void);
int		 kr_nexthop_add(struct bgpd_addr *);
void		 kr_nexthop_delete(struct bgpd_addr *);
void		 kr_show_route(struct imsg *);
void		 kr_ifinfo(char *);
in_addr_t	 prefixlen2mask(u_int8_t);
struct in6_addr	*prefixlen2mask6(u_int8_t prefixlen);
void		 inet6applymask(struct in6_addr *, const struct in6_addr *,
		    int);

/* control.c */
int	control_init(void);
void	control_cleanup(void);
int	control_imsg_relay(struct imsg *);

/* pftable.c */
int	pftable_exists(const char *);
int	pftable_add(const char *);
int	pftable_clear_all(void);
int	pftable_addr_add(struct pftable_msg *);
int	pftable_addr_remove(struct pftable_msg *);
int	pftable_commit(void);

#endif /* __BGPD_H__ */