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ip_encap.h revision 1.26 
      1 /*	$NetBSD: ip_encap.h,v 1.26 2022/12/07 08:27:03 knakahara Exp $	*/
      2 /*	$KAME: ip_encap.h,v 1.7 2000/03/25 07:23:37 sumikawa Exp $	*/
      3 
      4 /*
      5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the project nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 
     33 #ifndef _NETINET_IP_ENCAP_H_
     34 #define _NETINET_IP_ENCAP_H_
     35 
     36 #ifdef _KERNEL
     37 
     38 #ifndef RNF_NORMAL
     39 #include <net/radix.h>
     40 #endif
     41 
     42 #include <sys/pslist.h>
     43 #include <sys/psref.h>
     44 
     45 struct encapsw {
     46 	union {
     47 		struct encapsw4 {
     48 			void	(*pr_input)	/* input to protocol (from below) */
     49 				(struct mbuf *, int, int, void *);
     50 			void	*(*pr_ctlinput)		/* control input (from below) */
     51 				(int, const struct sockaddr *, void *, void *);
     52 		} _encapsw4;
     53 		struct encapsw6 {
     54 			int	(*pr_input)	/* input to protocol (from below) */
     55 				(struct mbuf **, int *, int, void *);
     56 			void	*(*pr_ctlinput)		/* control input (from below) */
     57 				(int, const struct sockaddr *, void *, void *);
     58 		} _encapsw6;
     59 	} encapsw46;
     60 };
     61 
     62 #define encapsw4 encapsw46._encapsw4
     63 #define encapsw6 encapsw46._encapsw6
     64 
     65 typedef	int encap_priofunc_t(struct mbuf *, int, int, void *);
     66 
     67 struct encaptab {
     68 	struct radix_node nodes[2];
     69 	struct pslist_entry chain;
     70 	int af;
     71 	int proto;			/* -1: don't care, I'll check myself */
     72 	struct sockaddr *addrpack;	/* malloc'ed, for radix lookup */
     73 	struct sockaddr *maskpack;	/* ditto */
     74 	struct sockaddr *src;		/* my addr */
     75 	struct sockaddr *srcmask;
     76 	struct sockaddr *dst;		/* remote addr */
     77 	struct sockaddr *dstmask;
     78 	encap_priofunc_t *func;
     79 	const struct encapsw *esw;
     80 	void *arg;
     81 	struct psref_target	psref;
     82 };
     83 
     84 /* to lookup a pair of address using radix tree */
     85 struct sockaddr_pack {
     86 	u_int8_t sp_len;
     87 	u_int8_t sp_family;	/* not really used */
     88 	/* followed by variable-length data */
     89 };
     90 
     91 struct ip_pack4 {
     92 	struct sockaddr_pack p;
     93 	struct sockaddr_in mine;
     94 	struct sockaddr_in yours;
     95 };
     96 struct ip_pack6 {
     97 	struct sockaddr_pack p;
     98 	struct sockaddr_in6 mine;
     99 	struct sockaddr_in6 yours;
    100 };
    101 
    102 void	encapinit(void);
    103 
    104 void	encap_init(void);
    105 void	encap4_input(struct mbuf *, int, int);
    106 int	encap6_input(struct mbuf **, int *, int);
    107 const struct encaptab *encap_attach(int, int, const struct sockaddr *,
    108 	const struct sockaddr *, const struct sockaddr *,
    109 	const struct sockaddr *, const struct encapsw *, void *);
    110 const struct encaptab *encap_attach_func(int, int,
    111 	encap_priofunc_t *,
    112 	const struct encapsw *, void *);
    113 void	*encap6_ctlinput(int, const struct sockaddr *, void *);
    114 int	encap_detach(const struct encaptab *);
    115 
    116 int	encap_lock_enter(void);
    117 void	encap_lock_exit(void);
    118 bool	encap_lock_held(void);
    119 
    120 #define	ENCAP_PR_WRAP_CTLINPUT(name)				\
    121 static void *							\
    122 name##_wrapper(int a, const struct sockaddr *b, void *c, void *d) \
    123 {								\
    124 	void *rv;						\
    125 	KERNEL_LOCK(1, NULL);					\
    126 	rv = name(a, b, c, d);					\
    127 	KERNEL_UNLOCK_ONE(NULL);				\
    128 	return rv;						\
    129 }
    130 #endif
    131 
    132 #endif /* !_NETINET_IP_ENCAP_H_ */
    133