| 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 | |