summaryrefslogtreecommitdiffstats
path: root/extensions/libip6t_physdev.c
blob: d4df6420fad28ca48dbb7cb3417f6e823459d0d0 (plain)
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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
/* Shared library add-on to iptables to add bridge port matching support. */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <ctype.h>
#include <ip6tables.h>
#include <linux/netfilter_ipv6/ip6t_physdev.h>
#if defined(__GLIBC__) && __GLIBC__ == 2
#include <net/ethernet.h>
#else
#include <linux/if_ether.h>
#endif

static void
help(void)
{
	printf(
"physdev v%s options:\n"
" --physdev-in [!] input name[+]		bridge port name ([+] for wildcard)\n"
" --physdev-out [!] output name[+]	bridge port name ([+] for wildcard)\n"
" [!] --physdev-is-in			arrived on a bridge device\n"
" [!] --physdev-is-out			will leave on a bridge device\n"
" [!] --physdev-is-bridged		it's a bridged packet\n"
"\n", IPTABLES_VERSION);
}

static struct option opts[] = {
	{ "physdev-in", 1, 0, '1' },
	{ "physdev-out", 1, 0, '2' },
	{ "physdev-is-in", 0, 0, '3' },
	{ "physdev-is-out", 0, 0, '4' },
	{ "physdev-is-bridged", 0, 0, '5' },
	{0}
};

static void
init(struct xt_entry_match *m, unsigned int *nfcache)
{
}

static int
parse(int c, char **argv, int invert, unsigned int *flags,
      const struct ip6t_entry *entry,
      unsigned int *nfcache,
      struct xt_entry_match **match)
{
	struct ip6t_physdev_info *info =
		(struct ip6t_physdev_info*)(*match)->data;

	switch (c) {
	case '1':
		if (*flags & IP6T_PHYSDEV_OP_IN)
			goto multiple_use;
		check_inverse(optarg, &invert, &optind, 0);
		parse_interface(argv[optind-1], info->physindev,
				(unsigned char *)info->in_mask);
		if (invert)
			info->invert |= IP6T_PHYSDEV_OP_IN;
		info->bitmask |= IP6T_PHYSDEV_OP_IN;
		*flags |= IP6T_PHYSDEV_OP_IN;
		break;

	case '2':
		if (*flags & IP6T_PHYSDEV_OP_OUT)
			goto multiple_use;
		check_inverse(optarg, &invert, &optind, 0);
		parse_interface(argv[optind-1], info->physoutdev,
				(unsigned char *)info->out_mask);
		if (invert)
			info->invert |= IP6T_PHYSDEV_OP_OUT;
		info->bitmask |= IP6T_PHYSDEV_OP_OUT;
		*flags |= IP6T_PHYSDEV_OP_OUT;
		break;

	case '3':
		if (*flags & IP6T_PHYSDEV_OP_ISIN)
			goto multiple_use;
		check_inverse(optarg, &invert, &optind, 0);
		info->bitmask |= IP6T_PHYSDEV_OP_ISIN;
		if (invert)
			info->invert |= IP6T_PHYSDEV_OP_ISIN;
		*flags |= IP6T_PHYSDEV_OP_ISIN;
		break;

	case '4':
		if (*flags & IP6T_PHYSDEV_OP_ISOUT)
			goto multiple_use;
		check_inverse(optarg, &invert, &optind, 0);
		info->bitmask |= IP6T_PHYSDEV_OP_ISOUT;
		if (invert)
			info->invert |= IP6T_PHYSDEV_OP_ISOUT;
		*flags |= IP6T_PHYSDEV_OP_ISOUT;
		break;

	case '5':
		if (*flags & IP6T_PHYSDEV_OP_BRIDGED)
			goto multiple_use;
		check_inverse(optarg, &invert, &optind, 0);
		if (invert)
			info->invert |= IP6T_PHYSDEV_OP_BRIDGED;
		*flags |= IP6T_PHYSDEV_OP_BRIDGED;
		info->bitmask |= IP6T_PHYSDEV_OP_BRIDGED;
		break;

	default:
		return 0;
	}

	return 1;
multiple_use:
	exit_error(PARAMETER_PROBLEM,
	   "multiple use of the same physdev option is not allowed");

}

static void final_check(unsigned int flags)
{
	if (flags == 0)
		exit_error(PARAMETER_PROBLEM, "PHYSDEV: no physdev option specified");
}

static void
print(const struct ip6t_ip6 *ip,
      const struct xt_entry_match *match,
      int numeric)
{
	struct ip6t_physdev_info *info =
		(struct ip6t_physdev_info*)match->data;

	printf("PHYSDEV match");
	if (info->bitmask & IP6T_PHYSDEV_OP_ISIN)
		printf("%s --physdev-is-in",
		       info->invert & IP6T_PHYSDEV_OP_ISIN ? " !":"");
	if (info->bitmask & IP6T_PHYSDEV_OP_IN)
		printf("%s --physdev-in %s",
		(info->invert & IP6T_PHYSDEV_OP_IN) ? " !":"", info->physindev);

	if (info->bitmask & IP6T_PHYSDEV_OP_ISOUT)
		printf("%s --physdev-is-out",
		       info->invert & IP6T_PHYSDEV_OP_ISOUT ? " !":"");
	if (info->bitmask & IP6T_PHYSDEV_OP_OUT)
		printf("%s --physdev-out %s",
		(info->invert & IP6T_PHYSDEV_OP_OUT) ? " !":"", info->physoutdev);
	if (info->bitmask & IP6T_PHYSDEV_OP_BRIDGED)
		printf("%s --physdev-is-bridged",
		       info->invert & IP6T_PHYSDEV_OP_BRIDGED ? " !":"");
	printf(" ");
}

static void save(const struct ip6t_ip6 *ip, const struct xt_entry_match *match)
{
	struct ip6t_physdev_info *info =
		(struct ip6t_physdev_info*)match->data;

	if (info->bitmask & IP6T_PHYSDEV_OP_ISIN)
		printf("%s --physdev-is-in",
		       info->invert & IP6T_PHYSDEV_OP_ISIN ? " !":"");
	if (info->bitmask & IP6T_PHYSDEV_OP_IN)
		printf("%s --physdev-in %s",
		(info->invert & IP6T_PHYSDEV_OP_IN) ? " !":"", info->physindev);

	if (info->bitmask & IP6T_PHYSDEV_OP_ISOUT)
		printf("%s --physdev-is-out",
		       info->invert & IP6T_PHYSDEV_OP_ISOUT ? " !":"");
	if (info->bitmask & IP6T_PHYSDEV_OP_OUT)
		printf("%s --physdev-out %s",
		(info->invert & IP6T_PHYSDEV_OP_OUT) ? " !":"", info->physoutdev);
	if (info->bitmask & IP6T_PHYSDEV_OP_BRIDGED)
		printf("%s --physdev-is-bridged",
		       info->invert & IP6T_PHYSDEV_OP_BRIDGED ? " !":"");
	printf(" ");
}

static struct ip6tables_match physdev = {
	.name		= "physdev",
	.version	= IPTABLES_VERSION,
	.size		= IP6T_ALIGN(sizeof(struct ip6t_physdev_info)),
	.userspacesize	= IP6T_ALIGN(sizeof(struct ip6t_physdev_info)),
	.help		= &help,
	.init		= &init,
	.parse		= &parse,
	.final_check	= &final_check,
	.print		= &print,
	.save		= &save,
	.extra_opts	= opts,
};

void _init(void)
{
	register_match6(&physdev);
}