1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/*
* (C) 2005-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
* 2005 by Harald Welte <laforge@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#include "conntrack.h"
#include <stdio.h>
#include <getopt.h>
#include <stdlib.h>
#include <netinet/in.h> /* For htons */
#include <netinet/ip_icmp.h>
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
enum {
CT_ICMP_TYPE = (1 << 0),
CT_ICMP_CODE = (1 << 1),
CT_ICMP_ID = (1 << 2),
};
static struct option opts[] = {
{"icmp-type", 1, 0, '1'},
{"icmp-code", 1, 0, '2'},
{"icmp-id", 1, 0, '3'},
{0, 0, 0, 0}
};
#define ICMP_NUMBER_OF_OPT 4
static const char *icmp_optflags[ICMP_NUMBER_OF_OPT] = {
"icmp-type", "icmp-code", "icmp-id"
};
static char icmp_commands_v_options[NUMBER_OF_CMD][ICMP_NUMBER_OF_OPT] =
/* Well, it's better than "Re: Maradona vs Pele" */
{
/* 1 2 3 */
/*CT_LIST*/ {2,2,2},
/*CT_CREATE*/ {1,1,2},
/*CT_UPDATE*/ {1,1,2},
/*CT_DELETE*/ {1,1,2},
/*CT_GET*/ {1,1,2},
/*CT_FLUSH*/ {0,0,0},
/*CT_EVENT*/ {2,2,2},
/*CT_VERSION*/ {0,0,0},
/*CT_HELP*/ {0,0,0},
/*EXP_LIST*/ {0,0,0},
/*EXP_CREATE*/ {0,0,0},
/*EXP_DELETE*/ {0,0,0},
/*EXP_GET*/ {0,0,0},
/*EXP_FLUSH*/ {0,0,0},
/*EXP_EVENT*/ {0,0,0},
};
static void help(void)
{
fprintf(stdout, " --icmp-type\t\t\ticmp type\n");
fprintf(stdout, " --icmp-code\t\t\ticmp code\n");
fprintf(stdout, " --icmp-id\t\t\ticmp id\n");
}
static int parse(char c,
struct nf_conntrack *ct,
struct nf_conntrack *exptuple,
struct nf_conntrack *mask,
unsigned int *flags)
{
switch(c) {
u_int8_t tmp;
u_int16_t id;
case '1':
tmp = atoi(optarg);
nfct_set_attr_u8(ct, ATTR_ICMP_TYPE, tmp);
nfct_set_attr_u8(ct, ATTR_L4PROTO, IPPROTO_ICMP);
*flags |= CT_ICMP_TYPE;
break;
case '2':
tmp = atoi(optarg);
nfct_set_attr_u8(ct, ATTR_ICMP_CODE, tmp);
nfct_set_attr_u8(ct, ATTR_L4PROTO, IPPROTO_ICMP);
*flags |= CT_ICMP_CODE;
break;
case '3':
id = htons(atoi(optarg));
nfct_set_attr_u16(ct, ATTR_ICMP_ID, id);
nfct_set_attr_u8(ct, ATTR_L4PROTO, IPPROTO_ICMP);
*flags |= CT_ICMP_ID;
break;
}
return 1;
}
static void final_check(unsigned int flags,
unsigned int cmd,
struct nf_conntrack *ct)
{
generic_opt_check(flags,
ICMP_NUMBER_OF_OPT,
icmp_commands_v_options[cmd],
icmp_optflags);
}
static struct ctproto_handler icmp = {
.name = "icmp",
.protonum = IPPROTO_ICMP,
.parse_opts = parse,
.final_check = final_check,
.help = help,
.opts = opts,
.version = VERSION,
};
void register_icmp(void)
{
register_proto(&icmp);
}
|
