/*-
* Copyright (c) 2015-2020 Mindaugas Rasiukevicius <rmind at netbsd org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/

#ifndef _NPFKERN_H_
#define _NPFKERN_H_

#ifndef _KERNEL
#include <stdbool.h>
#include <inttypes.h>
#endif

struct mbuf;
struct ifnet;

#if defined(_NPF_STANDALONE) || !defined(__NetBSD__)
#define PFIL_IN         0x00000001      // incoming packet
#define PFIL_OUT        0x00000002      // outgoing packet
#endif

#define NPF_NO_GC       0x01

typedef struct {
       const char *    (*getname)(npf_t *, struct ifnet *);
       struct ifnet *  (*lookup)(npf_t *, const char *);
       void            (*flush)(npf_t *, void *);
       void *          (*getmeta)(npf_t *, const struct ifnet *);
       void            (*setmeta)(npf_t *, struct ifnet *, void *);
} npf_ifops_t;

typedef struct {
       struct mbuf *   (*alloc)(npf_t *, unsigned, size_t);
       void            (*free)(struct mbuf *);
       void *          (*getdata)(const struct mbuf *);
       struct mbuf *   (*getnext)(struct mbuf *);
       size_t          (*getlen)(const struct mbuf *);
       size_t          (*getchainlen)(const struct mbuf *);
       bool            (*ensure_contig)(struct mbuf **, size_t);
       bool            (*ensure_writable)(struct mbuf **, size_t);
       int             (*get_tag)(const struct mbuf *, uint32_t *);
       int             (*set_tag)(struct mbuf *, uint32_t);
} npf_mbufops_t;

int     npfk_sysinit(unsigned);
void    npfk_sysfini(void);

npf_t * npfk_create(int, const npf_mbufops_t *, const npf_ifops_t *, void *);
int     npfk_load(npf_t *, const void *, npf_error_t *);
int     npfk_socket_load(npf_t *, int);
void    npfk_gc(npf_t *);
void    npfk_destroy(npf_t *);
void *  npfk_getarg(npf_t *);

void    npfk_thread_register(npf_t *);
void    npfk_thread_unregister(npf_t *);

int     npfk_packet_handler(npf_t *, struct mbuf **, struct ifnet *, int);
int     npfk_layer2_handler(npf_t *, struct mbuf **, struct ifnet *, int);

void    npfk_ifmap_attach(npf_t *, struct ifnet *);
void    npfk_ifmap_detach(npf_t *, struct ifnet *);

int     npfk_param_get(npf_t *, const char *, int *);
int     npfk_param_set(npf_t *, const char *, int);

void    npfk_stats(npf_t *, uint64_t *);
void    npfk_stats_clear(npf_t *);

/*
* Extensions.
*/

int     npf_ext_log_init(npf_t *);
int     npf_ext_log_fini(npf_t *);

int     npf_ext_normalize_init(npf_t *);
int     npf_ext_normalize_fini(npf_t *);

int     npf_ext_rndblock_init(npf_t *);
int     npf_ext_rndblock_fini(npf_t *);

/*
* ALGs.
*/

int     npf_alg_icmp_init(npf_t *);
int     npf_alg_icmp_fini(npf_t *);

int     npf_alg_pptp_init(npf_t *);
int     npf_alg_pptp_fini(npf_t *);

#endif