/*-
 * Copyright (c) 2014
 * 	Alexander V. Chernikov <melifaro@FreeBSD.org>
 *
 * 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.
 * 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.
 */

#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_route.h"
#include "opt_mpath.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <sys/rmlock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/sysproto.h>
#include <sys/proc.h>
#include <sys/domain.h>
#include <sys/kernel.h>
#include <sys/sbuf.h>

#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/route_internal.h>
#include <net/vnet.h>

#ifdef RADIX_MPATH
#include <net/radix_mpath.h>
#endif

#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip_mroute.h>
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/scope6_var.h>

#include <net/if_llatbl.h>

#include <net/if_types.h>
#include <netinet/if_ether.h>
#include <net/ethernet.h>
#include <net/rt_nhops.h>

#include <vm/uma.h>

struct fwd_info {
	fib_lookup_t	*lookup;
	void		*state;
};

#define	FWD_FSM_NONE	0
#define	FWD_FSM_INIT	1
#define	FWD_FSM_FWD	2
struct fwd_control {
	int		fwd_state;	/* FSM */
	struct fwd_module	*fm;
};

#if 0
static struct fwd_info *fwd_db[FWD_SIZE];
static struct fwd_control *fwd_ctl[FWD_SIZE];

static TAILQ_HEAD(fwd_module_list, fwd_module)	modulehead = TAILQ_HEAD_INITIALIZER(modulehead);
static struct fwd_module_list fwd_modules[FWD_SIZE];

static uint8_t fwd_map_af[] = {
	AF_INET,
	AF_INET6,
};

static struct rwlock fwd_lock;
#define	FWD_LOCK_INIT()	rw_init(&fwd_lock, "fwd_lock")
#define	FWD_RLOCK()	rw_rlock(&fwd_lock)
#define	FWD_RUNLOCK()	rw_runlock(&fwd_lock)
#define	FWD_WLOCK()	rw_wlock(&fwd_lock)
#define	FWD_WUNLOCK()	rw_wunlock(&fwd_lock)

int fwd_attach_fib(struct fwd_module *fm, u_int fib);
int fwd_destroy_fib(struct fwd_module *fm, u_int fib);
#endif

static inline uint16_t fib_rte_to_nh_flags(int rt_flags);

MALLOC_DEFINE(M_RTFIB, "rtfib", "routing fwd");



/*
 * Per-AF fast routines returning minimal needed info.
 * It is not safe to dereference any pointers since it
 * may end up with use-after-free case.
 * Typically it may be used to check if outgoing
 * interface matches or to calculate proper MTU.
 *
 * Note that returned interface pointer is logical one,
 * e.g. actual transmit ifp may be different.
 * Difference may be triggered by
 * 1) loopback routes installed for interface addresses.
 *  e.g. for address 10.0.0.1 with prefix /24 bound to
 *  interface ix0, "logical" interface will be "ix0",
 *  while "trasmit" interface will be "lo0" since this is
 *  loopback route. You should consider using other
 *  functions if you need "transmit" interface or both.
 *
 *
 * Returns 0 on match, error code overwise.
 */

//#define	NHOP_DIRECT	


#if 0
static inline void
fib_free_nh_prepend(uint32_t fibnum, struct nhop_prepend *nh, int af)
{

	/* TODO: Do some light-weight refcounting on egress ifp's */
}
#endif


void
fib_free_nh_ext(uint32_t fibnum, struct nhopu_extended *pnhu)
{

}


#if 0
typedef void nhop_change_cb_t(void *state);


struct nhop_tracker {
	TAILQ_ENTRY(nhop_tracker)	next;
	nhop_change_cb_t	*f;
	void		*state;
	uint32_t	fibnum;
	struct sockaddr_storage	ss;
};

struct nhop_tracker *
nhop_alloc_tracked(uint32_t fibnum, struct sockaddr *sa, nhop_change_cb_t *f,
    void *state)
{
	struct nhop_tracker *nt;

	nt = malloc(sizeof(struct nhop_tracker), M_RTFIB, M_WAITOK | M_ZERO);

	nt->f = f;
	nt-state = state;
	nt->fibnum = fibnum;
	memcpy(&nt->ss, sa, sa->sa_len);

	return (nt);
}


int
nhop_bind(struct nhop_tracker *nt)
{
	NHOP_LOCK(nnh);

	NHOP_UNLOCK(nnh);

	return (0);
}
#endif