1/*
2 * libipq.h
3 *
4 * IPQ library for userspace.
5 *
6 * Author: James Morris <jmorris@intercode.com.au>
7 *
8 * Copyright (c) 2000-2001 Netfilter Core Team
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 * GNU General Public License for more details.
19 *
20 */
21#ifndef _LIBIPQ_H
22#define _LIBIPQ_H
23
24#include <errno.h>
25#include <unistd.h>
26#include <fcntl.h>
27#include <sys/types.h>
28#include <sys/socket.h>
29#include <sys/uio.h>
30#include <asm/types.h>
31#include <linux/netlink.h>
32
33#include <linux/netfilter_ipv4/ip_queue.h>
34typedef unsigned long ipq_id_t;
35
36#ifdef DEBUG_LIBIPQ
37#include <stdio.h>
38#define LDEBUG(x...) fprintf(stderr, ## x)
39#else
40#define LDEBUG(x...)
41#endif	/* DEBUG_LIBIPQ */
42
43/* FIXME: glibc sucks */
44#ifndef MSG_TRUNC
45#define MSG_TRUNC 0x20
46#endif
47
48struct ipq_handle
49{
50	int fd;
51	u_int8_t blocking;
52	struct sockaddr_nl local;
53	struct sockaddr_nl peer;
54};
55
56struct ipq_handle *ipq_create_handle(u_int32_t flags, u_int32_t protocol);
57
58int ipq_destroy_handle(struct ipq_handle *h);
59
60ssize_t ipq_read(const struct ipq_handle *h,
61                unsigned char *buf, size_t len, int timeout);
62
63int ipq_set_mode(const struct ipq_handle *h, u_int8_t mode, size_t len);
64
65ipq_packet_msg_t *ipq_get_packet(const unsigned char *buf);
66
67int ipq_message_type(const unsigned char *buf);
68
69int ipq_get_msgerr(const unsigned char *buf);
70
71int ipq_set_verdict(const struct ipq_handle *h,
72                    ipq_id_t id,
73                    unsigned int verdict,
74                    size_t data_len,
75                    unsigned char *buf);
76
77int ipq_ctl(const struct ipq_handle *h, int request, ...);
78
79char *ipq_errstr(void);
80void ipq_perror(const char *s);
81
82#endif	/* _LIBIPQ_H */
83
84