/*
 * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1980, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)route.h	8.3 (Berkeley) 4/19/94
 * $FreeBSD: src/sys/net/route.h,v 1.36.2.1 2000/08/16 06:14:23 jayanth Exp $
 */

#ifndef _NET_ROUTE_H_
#define _NET_ROUTE_H_
#include <sys/appleapiopts.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/socket.h>

/*
 * Kernel resident routing tables.
 *
 * The routing tables are initialized when interface addresses
 * are set by making entries for all directly connected interfaces.
 */

/*
 * A route consists of a destination address and a reference
 * to a routing entry.  These are often held by protocols
 * in their control blocks, e.g. inpcb.
 */
#ifdef PRIVATE
struct  rtentry;
struct route {
	/*
	 * N.B: struct route must begin with ro_rt and ro_flags
	 * because the code does some casts of a 'struct route_in6 *'
	 * to a 'struct route *'.
	 */
	struct rtentry	*ro_rt;
	uint32_t	ro_flags;	/* route flags (see below) */
	struct sockaddr	ro_dst;
};

#define	ROF_SRCIF_SELECTED	0x1 /* source interface was selected */

#else
struct route;
#endif /* PRIVATE */

/*
 * These numbers are used by reliable protocols for determining
 * retransmission behavior and are included in the routing structure.
 */
struct rt_metrics {
	u_int32_t	rmx_locks;	/* Kernel must leave these values alone */
	u_int32_t	rmx_mtu;	/* MTU for this path */
	u_int32_t	rmx_hopcount;	/* max hops expected */
	int32_t		rmx_expire;	/* lifetime for route, e.g. redirect */
	u_int32_t	rmx_recvpipe;	/* inbound delay-bandwidth product */
	u_int32_t	rmx_sendpipe;	/* outbound delay-bandwidth product */
	u_int32_t	rmx_ssthresh;	/* outbound gateway buffer limit */
	u_int32_t	rmx_rtt;	/* estimated round trip time */
	u_int32_t	rmx_rttvar;	/* estimated rtt variance */
	u_int32_t	rmx_pksent;	/* packets sent using this route */
	u_int32_t	rmx_filler[4];	/* will be used for T/TCP later */
};

/*
 * rmx_rtt and rmx_rttvar are stored as microseconds;
 */
#define	RTM_RTTUNIT	1000000	/* units for rtt, rttvar, as units per sec */

/*
 * We distinguish between routes to hosts and routes to networks,
 * preferring the former if available.  For each route we infer
 * the interface to use from the gateway address supplied when
 * the route was entered.  Routes that forward packets through
 * gateways are marked so that the output routines know to address the
 * gateway rather than the ultimate destination.
 */
#ifdef KERNEL_PRIVATE
#include <kern/locks.h>
#ifndef RNF_NORMAL
#include <net/radix.h>
#endif
/*
 * Kernel routing entry structure (private).
 */
struct rtentry {
	struct	radix_node rt_nodes[2];	/* tree glue, and other values */
#define	rt_key(r)	((struct sockaddr *)((r)->rt_nodes->rn_key))
#define	rt_mask(r)	((struct sockaddr *)((r)->rt_nodes->rn_mask))
	struct	sockaddr *rt_gateway;	/* value */
	int32_t	rt_refcnt;		/* # held references */
	uint32_t rt_flags;		/* up/down?, host/net */
	struct	ifnet *rt_ifp;		/* the answer: interface to use */
	struct	ifaddr *rt_ifa;		/* the answer: interface addr to use */
	struct	sockaddr *rt_genmask;	/* for generation of cloned routes */
	void	*rt_llinfo;		/* pointer to link level info cache */
	void	(*rt_llinfo_free)(void *); /* link level info free function */
	struct	rt_metrics rt_rmx;	/* metrics used by rx'ing protocols */
	struct	rtentry *rt_gwroute;	/* implied entry for gatewayed routes */
	struct	rtentry *rt_parent;	/* cloning parent of this route */
	uint32_t generation_id;		/* route generation id */
	/*
	 * See bsd/net/route.c for synchronization notes.
	 */
	decl_lck_mtx_data(, rt_lock);	/* lock for routing entry */
};
#endif /* KERNEL_PRIVATE */

#ifdef KERNEL_PRIVATE
#define rt_use rt_rmx.rmx_pksent
#endif /* KERNEL_PRIVATE */

#define	RTF_UP		0x1		/* route usable */
#define	RTF_GATEWAY	0x2		/* destination is a gateway */
#define	RTF_HOST	0x4		/* host entry (net otherwise) */
#define	RTF_REJECT	0x8		/* host or net unreachable */
#define	RTF_DYNAMIC	0x10		/* created dynamically (by redirect) */
#define	RTF_MODIFIED	0x20		/* modified dynamically (by redirect) */
#define RTF_DONE	0x40		/* message confirmed */
#define RTF_DELCLONE	0x80		/* delete cloned route */
#define RTF_CLONING	0x100		/* generate new routes on use */
#define RTF_XRESOLVE	0x200		/* external daemon resolves name */
#define RTF_LLINFO	0x400		/* generated by link layer (e.g. ARP) */
#define RTF_STATIC	0x800		/* manually added */
#define RTF_BLACKHOLE	0x1000		/* just discard pkts (during updates) */
#define RTF_PROTO2	0x4000		/* protocol specific routing flag */
#define RTF_PROTO1	0x8000		/* protocol specific routing flag */

#define RTF_PRCLONING	0x10000		/* protocol requires cloning */
#define RTF_WASCLONED	0x20000		/* route generated through cloning */
#define RTF_PROTO3	0x40000		/* protocol specific routing flag */
					/* 0x80000 unused */
#define RTF_PINNED	0x100000	/* future use */
#define	RTF_LOCAL	0x200000	/* route represents a local address */
#define	RTF_BROADCAST	0x400000	/* route represents a bcast address */
#define	RTF_MULTICAST	0x800000	/* route represents a mcast address */
#define RTF_IFSCOPE	0x1000000	/* has valid interface scope */
#define RTF_CONDEMNED	0x2000000	/* defunct; no longer modifiable */
					/* 0x4000000 and up unassigned */

/*
 * Routing statistics.
 */
struct	rtstat {
	short	rts_badredirect;	/* bogus redirect calls */
	short	rts_dynamic;		/* routes created by redirects */
	short	rts_newgateway;		/* routes modified by redirects */
	short	rts_unreach;		/* lookups which failed */
	short	rts_wildcard;		/* lookups satisfied by a wildcard */
};

/*
 * Structures for routing messages.
 */
struct rt_msghdr {
	u_short	rtm_msglen;		/* to skip over non-understood messages */
	u_char	rtm_version;		/* future binary compatibility */
	u_char	rtm_type;		/* message type */
	u_short	rtm_index;		/* index for associated ifp */
	int	rtm_flags;		/* flags, incl. kern & message, e.g. DONE */
	int	rtm_addrs;		/* bitmask identifying sockaddrs in msg */
	pid_t	rtm_pid;		/* identify sender */
	int	rtm_seq;		/* for sender to identify action */
	int	rtm_errno;		/* why failed */
	int	rtm_use;		/* from rtentry */
	u_int32_t rtm_inits;		/* which metrics we are initializing */
	struct rt_metrics rtm_rmx;	/* metrics themselves */
};

struct rt_msghdr2 {
	u_short	rtm_msglen;		/* to skip over non-understood messages */
	u_char	rtm_version;		/* future binary compatibility */
	u_char	rtm_type;		/* message type */
	u_short	rtm_index;		/* index for associated ifp */
	int	rtm_flags;		/* flags, incl. kern & message, e.g. DONE */
	int	rtm_addrs;		/* bitmask identifying sockaddrs in msg */
	int32_t	rtm_refcnt;		/* reference count */
	int	rtm_parentflags;	/* flags of the parent route */
	int	rtm_reserved;		/* reserved field set to 0 */
	int	rtm_use;		/* from rtentry */
	u_int32_t rtm_inits;		/* which metrics we are initializing */
	struct rt_metrics rtm_rmx;	/* metrics themselves */
};


#define RTM_VERSION	5	/* Up the ante and ignore older versions */

/*
 * Message types.
 */
#define RTM_ADD		0x1	/* Add Route */
#define RTM_DELETE	0x2	/* Delete Route */
#define RTM_CHANGE	0x3	/* Change Metrics or flags */
#define RTM_GET		0x4	/* Report Metrics */
#define RTM_LOSING	0x5	/* Kernel Suspects Partitioning */
#define RTM_REDIRECT	0x6	/* Told to use different route */
#define RTM_MISS	0x7	/* Lookup failed on this address */
#define RTM_LOCK	0x8	/* fix specified metrics */
#define RTM_OLDADD	0x9	/* caused by SIOCADDRT */
#define RTM_OLDDEL	0xa	/* caused by SIOCDELRT */
#define RTM_RESOLVE	0xb	/* req to resolve dst to LL addr */
#define RTM_NEWADDR	0xc	/* address being added to iface */
#define RTM_DELADDR	0xd	/* address being removed from iface */
#define RTM_IFINFO	0xe	/* iface going up/down etc. */
#define	RTM_NEWMADDR	0xf	/* mcast group membership being added to if */
#define	RTM_DELMADDR	0x10	/* mcast group membership being deleted */
#ifdef PRIVATE
#define RTM_GET_SILENT	0x11
#endif /* PRIVATE */
#define RTM_IFINFO2	0x12	/* */
#define RTM_NEWMADDR2	0x13	/* */
#define RTM_GET2	0x14	/* */

/*
 * Bitmask values for rtm_inits and rmx_locks.
 */
#define RTV_MTU		0x1	/* init or lock _mtu */
#define RTV_HOPCOUNT	0x2	/* init or lock _hopcount */
#define RTV_EXPIRE	0x4	/* init or lock _expire */
#define RTV_RPIPE	0x8	/* init or lock _recvpipe */
#define RTV_SPIPE	0x10	/* init or lock _sendpipe */
#define RTV_SSTHRESH	0x20	/* init or lock _ssthresh */
#define RTV_RTT		0x40	/* init or lock _rtt */
#define RTV_RTTVAR	0x80	/* init or lock _rttvar */

/*
 * Bitmask values for rtm_addrs.
 */
#define RTA_DST		0x1	/* destination sockaddr present */
#define RTA_GATEWAY	0x2	/* gateway sockaddr present */
#define RTA_NETMASK	0x4	/* netmask sockaddr present */
#define RTA_GENMASK	0x8	/* cloning mask sockaddr present */
#define RTA_IFP		0x10	/* interface name sockaddr present */
#define RTA_IFA		0x20	/* interface addr sockaddr present */
#define RTA_AUTHOR	0x40	/* sockaddr for author of redirect */
#define RTA_BRD		0x80	/* for NEWADDR, broadcast or p-p dest addr */

/*
 * Index offsets for sockaddr array for alternate internal encoding.
 */
#define RTAX_DST	0	/* destination sockaddr present */
#define RTAX_GATEWAY	1	/* gateway sockaddr present */
#define RTAX_NETMASK	2	/* netmask sockaddr present */
#define RTAX_GENMASK	3	/* cloning mask sockaddr present */
#define RTAX_IFP	4	/* interface name sockaddr present */
#define RTAX_IFA	5	/* interface addr sockaddr present */
#define RTAX_AUTHOR	6	/* sockaddr for author of redirect */
#define RTAX_BRD	7	/* for NEWADDR, broadcast or p-p dest addr */
#define RTAX_MAX	8	/* size of array to allocate */

struct rt_addrinfo {
	int	rti_addrs;
	struct	sockaddr *rti_info[RTAX_MAX];
};

struct route_cb {
	int	ip_count;
	int	ip6_count;
	int	ipx_count;
	int	ns_count;
	int	iso_count;
	int	any_count;
};

#ifdef PRIVATE
/*
 * For scoped routing; a zero interface scope value means nil/no scope.
 */
#define	IFSCOPE_NONE	0
#endif /* PRIVATE */

#ifdef KERNEL_PRIVATE
/*
 * Generic call trace used by some subsystems (e.g. route, ifaddr)
 */
#define	CTRACE_STACK_SIZE	8		/* depth of stack trace */
#define	CTRACE_HIST_SIZE	4		/* refcnt history size */
typedef struct ctrace {
	void	*th;				/* thread ptr */
	void	*pc[CTRACE_STACK_SIZE];		/* PC stack trace */
} ctrace_t;

extern void ctrace_record(ctrace_t *);

#define	RT_LOCK_ASSERT_HELD(_rt)					\
	lck_mtx_assert(&(_rt)->rt_lock, LCK_MTX_ASSERT_OWNED)

#define	RT_LOCK_ASSERT_NOTHELD(_rt)					\
	lck_mtx_assert(&(_rt)->rt_lock, LCK_MTX_ASSERT_NOTOWNED)

#define	RT_LOCK(_rt) do {						\
	if (!rte_debug)							\
		lck_mtx_lock(&(_rt)->rt_lock);				\
	else								\
		rt_lock(_rt, FALSE);					\
} while (0)

#define	RT_LOCK_SPIN(_rt) do {						\
	if (!rte_debug)							\
		lck_mtx_lock_spin(&(_rt)->rt_lock);			\
	else								\
		rt_lock(_rt, TRUE);					\
} while (0)

#define	RT_CONVERT_LOCK(_rt) do {					\
	RT_LOCK_ASSERT_HELD(_rt);					\
	lck_mtx_convert_spin(&(_rt)->rt_lock);				\
} while (0)

#define	RT_UNLOCK(_rt) do {						\
	if (!rte_debug)							\
		lck_mtx_unlock(&(_rt)->rt_lock);			\
	else								\
		rt_unlock(_rt);						\
} while (0)

#define	RT_ADDREF_LOCKED(_rt) do {					\
	if (!rte_debug) {						\
		RT_LOCK_ASSERT_HELD(_rt);				\
		if (++(_rt)->rt_refcnt == 0)				\
			panic("RT_ADDREF(%p) bad refcnt\n", _rt);	\
	} else {							\
		rtref(_rt);						\
	}								\
} while (0)

/*
 * Spin variant mutex is used here; caller is responsible for
 * converting any previously-held similar lock to full mutex.
 */
#define	RT_ADDREF(_rt) do {						\
	RT_LOCK_SPIN(_rt);						\
	RT_ADDREF_LOCKED(_rt);						\
	RT_UNLOCK(_rt);							\
} while (0)

#define	RT_REMREF_LOCKED(_rt) do {					\
	if (!rte_debug) {						\
		RT_LOCK_ASSERT_HELD(_rt);				\
		if ((_rt)->rt_refcnt == 0)				\
			panic("RT_REMREF(%p) bad refcnt\n", _rt);	\
		--(_rt)->rt_refcnt;					\
	} else {							\
		(void) rtunref(_rt);					\
	}								\
} while (0)

/*
 * Spin variant mutex is used here; caller is responsible for
 * converting any previously-held similar lock to full mutex.
 */
#define	RT_REMREF(_rt) do {						\
	RT_LOCK_SPIN(_rt);						\
	RT_REMREF_LOCKED(_rt);						\
	RT_UNLOCK(_rt);							\
} while (0)

#define RTFREE(_rt)		rtfree(_rt)
#define RTFREE_LOCKED(_rt)	rtfree_locked(_rt)

extern struct route_cb route_cb;
extern struct radix_node_head *rt_tables[AF_MAX+1];
__private_extern__ lck_mtx_t *rnh_lock;
__private_extern__ int use_routegenid;
__private_extern__ uint32_t route_generation;
__private_extern__ int rttrash;
__private_extern__ unsigned int rte_debug;

struct ifmultiaddr;
struct proc;

extern void route_init(void) __attribute__((section("__TEXT, initcode")));
extern void routegenid_update(void);
extern void rt_ifmsg(struct ifnet *);
extern void rt_missmsg(int, struct rt_addrinfo *, int, int);
extern void rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *);
extern void rt_newmaddrmsg(int, struct ifmultiaddr *);
extern int rt_setgate(struct rtentry *, struct sockaddr *, struct sockaddr *);
extern void set_primary_ifscope(unsigned int);
extern unsigned int get_primary_ifscope(void);
extern boolean_t rt_inet_default(struct rtentry *, struct sockaddr *);
extern struct rtentry *rt_lookup(boolean_t, struct sockaddr *,
    struct sockaddr *, struct radix_node_head *, unsigned int);
extern void rtalloc(struct route *);
extern void rtalloc_ign(struct route *, uint32_t);
extern void rtalloc_ign_locked(struct route *, uint32_t);
extern void rtalloc_scoped_ign(struct route *, uint32_t, unsigned int);
extern void rtalloc_scoped_ign_locked(struct route *, uint32_t, unsigned int);
extern struct rtentry *rtalloc1(struct sockaddr *, int, uint32_t);
extern struct rtentry *rtalloc1_locked(struct sockaddr *, int, uint32_t);
extern struct rtentry *rtalloc1_scoped(struct sockaddr *, int, uint32_t,
    unsigned int);
extern struct rtentry *rtalloc1_scoped_locked(struct sockaddr *, int,
    uint32_t, unsigned int);
extern void rtfree(struct rtentry *);
extern void rtfree_locked(struct rtentry *);
extern void rtref(struct rtentry *);
/*
 * rtunref will decrement the refcount, rtfree will decrement and free if
 * the refcount has reached zero and the route is not up.
 * Unless you have good reason to do otherwise, use rtfree.
 */
extern int rtunref(struct rtentry *);
extern void rtsetifa(struct rtentry *, struct ifaddr *);
extern int rtinit(struct ifaddr *, int, int);
extern int rtinit_locked(struct ifaddr *, int, int);
extern int rtioctl(unsigned long, caddr_t, struct proc *);
extern void rtredirect(struct ifnet *, struct sockaddr *, struct sockaddr *,
    struct sockaddr *, int, struct sockaddr *, struct rtentry **);
extern int rtrequest(int, struct sockaddr *,
    struct sockaddr *, struct sockaddr *, int, struct rtentry **);
extern int rtrequest_locked(int, struct sockaddr *,
    struct sockaddr *, struct sockaddr *, int, struct rtentry **);
extern int rtrequest_scoped_locked(int, struct sockaddr *, struct sockaddr *,
    struct sockaddr *, int, struct rtentry **, unsigned int);
extern unsigned int sa_get_ifscope(struct sockaddr *);
extern void rt_lock(struct rtentry *, boolean_t);
extern void rt_unlock(struct rtentry *);
extern struct sockaddr *rtm_scrub_ifscope(int, struct sockaddr *,
    struct sockaddr *, struct sockaddr_storage *);
#endif /* KERNEL_PRIVATE */

#endif