ip_encap.h

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    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_ */

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FreeBSD/Linux Kernel Cross Reference sys/netinet/ip_encap.h

FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_encap.h