1 /* $NetBSD: ip_encap.h,v 1.28 2022/12/07 08:33:02 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 #include <sys/pslist.h> 39 #include <sys/psref.h> 40 41 struct encapsw { 42 union { 43 struct encapsw4 { 44 void (*pr_input) /* input to protocol (from below) */ 45 (struct mbuf *, int, int, void *); 46 void *(*pr_ctlinput) /* control input (from below) */ 47 (int, const struct sockaddr *, void *, void *); 48 } _encapsw4; 49 struct encapsw6 { 50 int (*pr_input) /* input to protocol (from below) */ 51 (struct mbuf **, int *, int, void *); 52 void *(*pr_ctlinput) /* control input (from below) */ 53 (int, const struct sockaddr *, void *, void *); 54 } _encapsw6; 55 } encapsw46; 56 }; 57 58 #define encapsw4 encapsw46._encapsw4 59 #define encapsw6 encapsw46._encapsw6 60 61 typedef int encap_priofunc_t(struct mbuf *, int, int, void *); 62 63 struct encap_key { 64 union { 65 struct sockaddr local_u_sa; 66 struct sockaddr_in local_u_sin; 67 struct sockaddr_in6 local_u_sin6; 68 } local_u; 69 #define local_sa local_u.local_u_sa 70 #define local_sin local_u.local_u_sin 71 #define local_sin6 local_u.local_u_sin6 72 73 union { 74 struct sockaddr remote_u_sa; 75 struct sockaddr_in remote_u_sin; 76 struct sockaddr_in6 remote_u_sin6; 77 } remote_u; 78 #define remote_sa remote_u.remote_u_sa 79 #define remote_sin remote_u.remote_u_sin 80 #define remote_sin6 remote_u.remote_u_sin6 81 82 u_int seq; 83 }; 84 85 struct encaptab { 86 struct pslist_entry chain; 87 int af; 88 int proto; /* -1: don't care, I'll check myself */ 89 struct sockaddr *addrpack; /* malloc'ed, for lookup */ 90 struct sockaddr *src; /* my addr */ 91 struct sockaddr *dst; /* remote addr */ 92 encap_priofunc_t *func; 93 const struct encapsw *esw; 94 void *arg; 95 struct encap_key key; 96 u_int flag; 97 struct psref_target psref; 98 }; 99 100 #define IP_ENCAP_ADDR_ENABLE __BIT(0) 101 102 /* to lookup a pair of address using map */ 103 struct sockaddr_pack { 104 u_int8_t sp_len; 105 u_int8_t sp_family; /* not really used */ 106 /* followed by variable-length data */ 107 }; 108 109 struct ip_pack4 { 110 struct sockaddr_pack p; 111 struct sockaddr_in mine; 112 struct sockaddr_in yours; 113 }; 114 struct ip_pack6 { 115 struct sockaddr_pack p; 116 struct sockaddr_in6 mine; 117 struct sockaddr_in6 yours; 118 }; 119 120 void encapinit(void); 121 122 void encap_init(void); 123 void encap4_input(struct mbuf *, int, int); 124 int encap6_input(struct mbuf **, int *, int); 125 const struct encaptab *encap_attach_func(int, int, 126 encap_priofunc_t *, 127 const struct encapsw *, void *); 128 const struct encaptab *encap_attach_addr(int, int, 129 const struct sockaddr *, const struct sockaddr *, 130 encap_priofunc_t *, const struct encapsw *, void *); 131 void *encap6_ctlinput(int, const struct sockaddr *, void *); 132 int encap_detach(const struct encaptab *); 133 134 int encap_lock_enter(void); 135 void encap_lock_exit(void); 136 bool encap_lock_held(void); 137 138 #define ENCAP_PR_WRAP_CTLINPUT(name) \ 139 static void * \ 140 name##_wrapper(int a, const struct sockaddr *b, void *c, void *d) \ 141 { \ 142 void *rv; \ 143 KERNEL_LOCK(1, NULL); \ 144 rv = name(a, b, c, d); \ 145 KERNEL_UNLOCK_ONE(NULL); \ 146 return rv; \ 147 } 148 #endif 149 150 #endif /* !_NETINET_IP_ENCAP_H_ */ 151