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Send source link-layer address option in router advertisements.

With this, hosts immediately learn the layer 2 (i.e. ethernet mac)
address of their default router and don't need to do another round
trip.

It also turns out that apple devices (macOS & iOS) install the default
route as what they call "interface scoped" if a DNS option is present
and the source link-layer address option is absent. This effectively
makes the default route unusable.

Problem with fruit devices tracked down & diff by Ryan Vogt (rvogt.ca
AT gmail), thanks!

OK sthen, bket

/*	$OpenBSD: rad.h,v 1.27 2024/05/17 06:50:14 florian Exp $	*/

/*
 * Copyright (c) 2018 Florian Obser <florian@openbsd.org>
 * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
 * 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.
 */

#define	_PATH_CONF_FILE		"/etc/rad.conf"
#define	_PATH_RAD_SOCKET	"/var/run/rad.sock"
#define	RAD_USER		"_rad"

#define	OPT_VERBOSE	0x00000001
#define	OPT_VERBOSE2	0x00000002
#define	OPT_NOACTION	0x00000004

#define	MAX_RTR_ADV_INTERVAL	600
#define	MIN_RTR_ADV_INTERVAL	200
#define	ADV_DEFAULT_LIFETIME	3 * MAX_RTR_ADV_INTERVAL
#define	ADV_PREFERRED_LIFETIME	2700	/* 45 minutes */
#define	ADV_VALID_LIFETIME	5400	/* 90 minutes */
#define	MAX_RA_DELAY_TIME	500	/* 500 milliseconds */
#define	MIN_DELAY_BETWEEN_RAS	3	/* 3 seconds */
#define	MAX_SEARCH		1025	/* MAXDNAME in arpa/nameser.h */
#define	DEFAULT_RDNS_LIFETIME	600 * 1.5

#define	IMSG_DATA_SIZE(imsg)	((imsg).hdr.len - IMSG_HEADER_SIZE)

struct imsgev {
	struct imsgbuf	 ibuf;
	void		(*handler)(int, short, void *);
	struct event	 ev;
	short		 events;
};

enum imsg_type {
	IMSG_NONE,
	IMSG_CTL_LOG_VERBOSE,
	IMSG_CTL_RELOAD,
	IMSG_RECONF_CONF,
	IMSG_RECONF_RA_IFACE,
	IMSG_RECONF_RA_AUTOPREFIX,
	IMSG_RECONF_RA_PREFIX,
	IMSG_RECONF_RA_RDNSS,
	IMSG_RECONF_RA_DNSSL,
	IMSG_RECONF_RA_PREF64,
	IMSG_RECONF_END,
	IMSG_ICMP6SOCK,
	IMSG_OPEN_ICMP6SOCK,
	IMSG_ROUTESOCK,
	IMSG_CONTROLFD,
	IMSG_STARTUP,
	IMSG_RA_RS,
	IMSG_SEND_RA,
	IMSG_UPDATE_IF,
	IMSG_REMOVE_IF,
	IMSG_SOCKET_IPC
};

/* RFC 8106 */
struct ra_rdnss_conf {
	SIMPLEQ_ENTRY(ra_rdnss_conf)	entry;
	struct in6_addr			rdnss;
};
struct ra_dnssl_conf {
	SIMPLEQ_ENTRY(ra_dnssl_conf)	entry;
	char				search[MAX_SEARCH];
};

/* RFC 8781 Section 4 */
struct ra_pref64_conf {
	SIMPLEQ_ENTRY(ra_pref64_conf)	 entry;
	struct in6_addr			 prefix;	/* prefix */
	int				 prefixlen;	/* prefix length */
	uint32_t			 ltime;		/* lifetime */
};

/* RFC 4861 Sections 4.2 and 4.6.4 */
struct ra_options_conf {
	int		dfr;			/* is default router? */
	int		cur_hl;			/* current hop limit */
	int		m_flag;			/* managed address conf flag */
	int		o_flag;			/* other conf flag */
	int		rtpref;			/* router preference */
	int		router_lifetime;	/* default router lifetime */
	uint32_t	reachable_time;
	uint32_t	retrans_timer;
	int		source_link_addr;	/* source link-layer address */
	uint32_t	mtu;
	uint32_t	rdns_lifetime;
	SIMPLEQ_HEAD(, ra_rdnss_conf)		 ra_rdnss_list;
	int		rdnss_count;
	SIMPLEQ_HEAD(, ra_dnssl_conf)		 ra_dnssl_list;
	int		dnssl_len;
	SIMPLEQ_HEAD(, ra_pref64_conf)		 ra_pref64_list;
};

/* RFC 4861 Section 4.6.2 */
struct ra_prefix_conf {
	SIMPLEQ_ENTRY(ra_prefix_conf)	 entry;
	struct in6_addr			 prefix;	/* prefix */
	int				 prefixlen;	/* prefix length */
	uint32_t			 vltime;	/* valid lifetime */
	uint32_t			 pltime;	/* preferred lifetime */
	int				 lflag;		/* on-link flag*/
	int				 aflag;		/* autonom. addr flag */
};

struct ra_iface_conf {
	SIMPLEQ_ENTRY(ra_iface_conf)		 entry;
	struct ra_options_conf			 ra_options;
	struct ra_prefix_conf			*autoprefix;
	SIMPLEQ_HEAD(ra_prefix_conf_head,
	    ra_prefix_conf)			 ra_prefix_list;
	char					 name[IF_NAMESIZE];
};

struct rad_conf {
	struct ra_options_conf				 ra_options;
	SIMPLEQ_HEAD(ra_iface_conf_head, ra_iface_conf)	 ra_iface_list;
};

struct imsg_ra_rs {
	uint32_t		if_index;
	struct sockaddr_in6	from;
	ssize_t			len;
	uint8_t			packet[1500];
};

struct imsg_send_ra {
	uint32_t		if_index;
	struct sockaddr_in6	to;
};

extern uint32_t	 cmd_opts;

/* rad.c */
int	main_imsg_compose_frontend(int, int, void *, uint16_t);
void	main_imsg_compose_engine(int, pid_t, void *, uint16_t);
void	merge_config(struct rad_conf *, struct rad_conf *);
void	imsg_event_add(struct imsgev *);
int	imsg_compose_event(struct imsgev *, uint16_t, uint32_t, pid_t,
	    int, void *, uint16_t);

struct rad_conf	*config_new_empty(void);
void		 config_clear(struct rad_conf *);
void		 free_ra_iface_conf(struct ra_iface_conf *);
void		 free_dns_options(struct ra_options_conf *);
void		 mask_prefix(struct in6_addr*, int len);
const char	*sin6_to_str(struct sockaddr_in6 *);
const char	*in6_to_str(struct in6_addr *);

/* printconf.c */
void	print_config(struct rad_conf *);

/* parse.y */
struct rad_conf	*parse_config(char *);
int			 cmdline_symset(char *);