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npfkern.h revision 1.6 
      1 /*-
      2  * Copyright (c) 2015-2020 Mindaugas Rasiukevicius <rmind at netbsd org>
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     24  * SUCH DAMAGE.
     25  */
     26 
     27 #ifndef _NPFKERN_H_
     28 #define _NPFKERN_H_
     29 
     30 #ifndef _KERNEL
     31 #include <stdbool.h>
     32 #include <inttypes.h>
     33 #endif
     34 
     35 struct mbuf;
     36 struct ifnet;
     37 
     38 #if defined(_NPF_STANDALONE) || !defined(__NetBSD__)
     39 #define PFIL_IN		0x00000001	// incoming packet
     40 #define PFIL_OUT	0x00000002	// outgoing packet
     41 #endif
     42 
     43 #define	NPF_NO_GC	0x01
     44 
     45 typedef struct {
     46 	const char *	(*getname)(npf_t *, struct ifnet *);
     47 	struct ifnet *	(*lookup)(npf_t *, const char *);
     48 	void		(*flush)(npf_t *, void *);
     49 	void *		(*getmeta)(npf_t *, const struct ifnet *);
     50 	void		(*setmeta)(npf_t *, struct ifnet *, void *);
     51 } npf_ifops_t;
     52 
     53 typedef struct {
     54 	struct mbuf *	(*alloc)(npf_t *, unsigned, size_t);
     55 	void		(*free)(struct mbuf *);
     56 	void *		(*getdata)(const struct mbuf *);
     57 	struct mbuf *	(*getnext)(struct mbuf *);
     58 	size_t		(*getlen)(const struct mbuf *);
     59 	size_t		(*getchainlen)(const struct mbuf *);
     60 	bool		(*ensure_contig)(struct mbuf **, size_t);
     61 	bool		(*ensure_writable)(struct mbuf **, size_t);
     62 	int		(*get_tag)(const struct mbuf *, uint32_t *);
     63 	int		(*set_tag)(struct mbuf *, uint32_t);
     64 } npf_mbufops_t;
     65 
     66 int	npfk_sysinit(unsigned);
     67 void	npfk_sysfini(void);
     68 
     69 npf_t *	npfk_create(int, const npf_mbufops_t *, const npf_ifops_t *, void *);
     70 int	npfk_load(npf_t *, const void *, npf_error_t *);
     71 int	npfk_socket_load(npf_t *, int);
     72 void	npfk_gc(npf_t *);
     73 void	npfk_destroy(npf_t *);
     74 void *	npfk_getarg(npf_t *);
     75 
     76 void	npfk_thread_register(npf_t *);
     77 void	npfk_thread_unregister(npf_t *);
     78 
     79 int	npfk_packet_handler(npf_t *, struct mbuf **, struct ifnet *, int);
     80 int	npfk_layer2_handler(npf_t *, struct mbuf **, struct ifnet *, int);
     81 
     82 void	npfk_ifmap_attach(npf_t *, struct ifnet *);
     83 void	npfk_ifmap_detach(npf_t *, struct ifnet *);
     84 
     85 int	npfk_param_get(npf_t *, const char *, int *);
     86 int	npfk_param_set(npf_t *, const char *, int);
     87 
     88 void	npfk_stats(npf_t *, uint64_t *);
     89 void	npfk_stats_clear(npf_t *);
     90 
     91 /*
     92  * Extensions.
     93  */
     94 
     95 int	npf_ext_log_init(npf_t *);
     96 int	npf_ext_log_fini(npf_t *);
     97 
     98 int	npf_ext_normalize_init(npf_t *);
     99 int	npf_ext_normalize_fini(npf_t *);
    100 
    101 int	npf_ext_rndblock_init(npf_t *);
    102 int	npf_ext_rndblock_fini(npf_t *);
    103 
    104 /*
    105  * ALGs.
    106  */
    107 
    108 int	npf_alg_icmp_init(npf_t *);
    109 int	npf_alg_icmp_fini(npf_t *);
    110 
    111 int	npf_alg_pptp_init(npf_t *);
    112 int	npf_alg_pptp_fini(npf_t *);
    113 
    114 #endif
    115