1 | /* $NetBSD: pfil.h,v 1.31 2013/06/29 21:06:58 rmind Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1996 Matthew R. Green |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
21 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
22 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
23 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
26 | * SUCH DAMAGE. |
27 | */ |
28 | |
29 | #ifndef _NET_PFIL_H_ |
30 | #define _NET_PFIL_H_ |
31 | |
32 | #include <sys/queue.h> |
33 | |
34 | struct mbuf; |
35 | struct ifnet; |
36 | |
37 | /* |
38 | * The packet filter hooks are designed for anything to call them to |
39 | * possibly intercept the packet. |
40 | */ |
41 | typedef int (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int); |
42 | |
43 | #define PFIL_IN 0x00000001 |
44 | #define PFIL_OUT 0x00000002 |
45 | #define PFIL_ALL (PFIL_IN|PFIL_OUT) |
46 | #define PFIL_IFADDR 0x00000008 |
47 | #define PFIL_IFNET 0x00000010 |
48 | |
49 | /* events notified by PFIL_IFNET */ |
50 | #define PFIL_IFNET_ATTACH 0 |
51 | #define PFIL_IFNET_DETACH 1 |
52 | |
53 | #define PFIL_TYPE_AF 1 /* key is AF_* type */ |
54 | #define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */ |
55 | |
56 | typedef struct pfil_head pfil_head_t; |
57 | |
58 | #ifdef _KERNEL |
59 | |
60 | int pfil_run_hooks(pfil_head_t *, struct mbuf **, struct ifnet *, int); |
61 | int pfil_add_hook(pfil_func_t, void *, int, pfil_head_t *); |
62 | int pfil_remove_hook(pfil_func_t, void *, int, pfil_head_t *); |
63 | |
64 | pfil_head_t * pfil_head_create(int, void *); |
65 | void pfil_head_destroy(pfil_head_t *); |
66 | pfil_head_t * pfil_head_get(int, void *); |
67 | |
68 | /* Packet filtering hook for interfaces (in sys/net/if.c module). */ |
69 | extern pfil_head_t *if_pfil; |
70 | |
71 | #endif /* _KERNEL */ |
72 | |
73 | #endif /* !_NET_PFIL_H_ */ |
74 | |