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Rewrite state machine in the style of dhcpleased(8).

It is less cluttered, easier to reason about and fixes some bugs in
passing that would have been difficult in the old state machine.

Stale IPv6 addresses, default routes and nameservers are now correctly
removed when moving from one IPv6 enabled network to another IPv6
enabled network.
Default routes and nameservers correctly expire when they are not
refreshed and nameservers are updated when router advertisements
change the nameserver option.

Testing & input caspar@

Putting it in now to get wider testing and shake out bugs, discussed
with deraadt@ at r2k22.

/*	$OpenBSD: slaacd.h,v 1.38 2022/07/12 16:55:00 florian Exp $	*/

/*
 * Copyright (c) 2017 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_LOCKFILE		"/dev/slaacd.lock"
#define	_PATH_SLAACD_SOCKET	"/dev/slaacd.sock"
#define SLAACD_USER		"_slaacd"
#define SLAACD_RTA_LABEL	"slaacd"

#define SLAACD_SOIIKEY_LEN	16

#define	MAX_RDNS_COUNT		8 /* max nameserver in a RTM_PROPOSAL */

#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,
#ifndef	SMALL
	IMSG_CTL_LOG_VERBOSE,
	IMSG_CTL_SHOW_INTERFACE_INFO,
	IMSG_CTL_SHOW_INTERFACE_INFO_RA,
	IMSG_CTL_SHOW_INTERFACE_INFO_RA_PREFIX,
	IMSG_CTL_SHOW_INTERFACE_INFO_RA_RDNS,
	IMSG_CTL_SHOW_INTERFACE_INFO_ADDR_PROPOSALS,
	IMSG_CTL_SHOW_INTERFACE_INFO_ADDR_PROPOSAL,
	IMSG_CTL_SHOW_INTERFACE_INFO_DFR_PROPOSALS,
	IMSG_CTL_SHOW_INTERFACE_INFO_DFR_PROPOSAL,
	IMSG_CTL_SHOW_INTERFACE_INFO_RDNS_PROPOSALS,
	IMSG_CTL_SHOW_INTERFACE_INFO_RDNS_PROPOSAL,
	IMSG_CTL_END,
#endif	/* SMALL */
	IMSG_PROPOSE_RDNS,
	IMSG_REPROPOSE_RDNS,
	IMSG_CTL_SEND_SOLICITATION,
	IMSG_SOCKET_IPC,
	IMSG_OPEN_ICMP6SOCK,
	IMSG_ICMP6SOCK,
	IMSG_ROUTESOCK,
	IMSG_CONTROLFD,
	IMSG_STARTUP,
	IMSG_UPDATE_IF,
	IMSG_REMOVE_IF,
	IMSG_RA,
	IMSG_CONFIGURE_ADDRESS,
	IMSG_WITHDRAW_ADDRESS,
	IMSG_DEL_ADDRESS,
	IMSG_DEL_ROUTE,
	IMSG_CONFIGURE_DFR,
	IMSG_WITHDRAW_DFR,
	IMSG_DUP_ADDRESS,
};

enum rpref {
	LOW,
	MEDIUM,
	HIGH,
};

#ifndef	SMALL
struct ctl_engine_info {
	uint32_t		if_index;
	int			running;
	int			autoconf;
	int			temporary;
	int			soii;
	struct ether_addr	hw_address;
	struct sockaddr_in6	ll_address;
};

struct ctl_engine_info_ra {
	struct sockaddr_in6	 from;
	struct timespec		 when;
	struct timespec		 uptime;
	uint8_t			 curhoplimit;
	int			 managed;
	int			 other;
	char			 rpref[sizeof("MEDIUM")];
	uint16_t		 router_lifetime;	/* in seconds */
	uint32_t		 reachable_time;	/* in milliseconds */
	uint32_t		 retrans_time;		/* in milliseconds */
	uint32_t		 mtu;
};

struct ctl_engine_info_ra_prefix {
	struct in6_addr		prefix;
	uint8_t			prefix_len;
	int			onlink;
	int			autonomous;
	uint32_t		vltime;
	uint32_t		pltime;
};

struct ctl_engine_info_ra_rdns {
	uint32_t		lifetime;
	struct in6_addr		rdns;
};

struct ctl_engine_info_address_proposal {
	int64_t			 id;
	char			 state[sizeof("PROPOSAL_NEARLY_EXPIRED")];
	time_t			 next_timeout;
	struct timespec		 when;
	struct timespec		 uptime;
	struct sockaddr_in6	 addr;
	struct in6_addr		 prefix;
	int			 temporary;
	uint8_t			 prefix_len;
	uint32_t		 vltime;
	uint32_t		 pltime;
};

struct ctl_engine_info_dfr_proposal {
	int64_t			 id;
	char			 state[sizeof("PROPOSAL_NEARLY_EXPIRED")];
	time_t			 next_timeout;
	struct timespec		 when;
	struct timespec		 uptime;
	struct sockaddr_in6	 addr;
	uint32_t		 router_lifetime;
	char			 rpref[sizeof("MEDIUM")];
};

struct ctl_engine_info_rdns_proposal {
	int64_t			 id;
	char			 state[sizeof("PROPOSAL_NEARLY_EXPIRED")];
	time_t			 next_timeout;
	struct timespec		 when;
	struct timespec		 uptime;
	struct sockaddr_in6	 from;
	uint32_t		 rdns_lifetime;
	int			 rdns_count;
	struct in6_addr		 rdns[MAX_RDNS_COUNT];
};

#endif	/* SMALL */

struct imsg_propose_rdns {
	uint32_t		if_index;
	int			rdomain;
	int			rdns_count;
	struct in6_addr		rdns[MAX_RDNS_COUNT];
};


struct imsg_ifinfo {
	uint32_t		if_index;
	int			rdomain;
	int			running;
	int			link_state;
	int			autoconf;
	int			temporary;
	int			soii;
	struct ether_addr	hw_address;
	struct sockaddr_in6	ll_address;
	uint8_t			soiikey[SLAACD_SOIIKEY_LEN];
};

struct imsg_del_addr {
	uint32_t		if_index;
	struct sockaddr_in6	addr;
};

struct imsg_del_route {
	uint32_t		if_index;
	struct sockaddr_in6	gw;
};

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

struct imsg_dup_addr {
	uint32_t		if_index;
	struct sockaddr_in6	addr;
};

/* slaacd.c */
void		imsg_event_add(struct imsgev *);
int		imsg_compose_event(struct imsgev *, uint16_t, uint32_t, pid_t,
		    int, void *, uint16_t);
#ifndef	SMALL
const char	*sin6_to_str(struct sockaddr_in6 *);
#else
#define	sin6_to_str(x...)	""
#endif	/* SMALL */