summaryrefslogtreecommitdiffstats
path: root/extensions/libebt_vlan.c
blob: 52cc99fa19c7ef568f6cb09f3c14365756ccdad3 (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
/* ebt_vlan
 *
 * Authors:
 * Bart De Schuymer <bdschuym@pandora.be>
 * Nick Fedchik <nick@fedchik.org.ua>
 * June, 2002
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <ctype.h>
#include <xtables.h>
#include <ebtables/ethernetdb.h>
#include <linux/netfilter_bridge/ebt_vlan.h>
#include <linux/if_ether.h>
#include "iptables/nft.h"
#include "iptables/nft-bridge.h"

#define NAME_VLAN_ID    "id"
#define NAME_VLAN_PRIO  "prio"
#define NAME_VLAN_ENCAP "encap"

#define VLAN_ID    '1'
#define VLAN_PRIO  '2'
#define VLAN_ENCAP '3'

static const struct option brvlan_opts[] = {
	{"vlan-id"   , required_argument, NULL, VLAN_ID},
	{"vlan-prio" , required_argument, NULL, VLAN_PRIO},
	{"vlan-encap", required_argument, NULL, VLAN_ENCAP},
	XT_GETOPT_TABLEEND,
};

/*
 * option inverse flags definition
 */
#define OPT_VLAN_ID     0x01
#define OPT_VLAN_PRIO   0x02
#define OPT_VLAN_ENCAP  0x04
#define OPT_VLAN_FLAGS	(OPT_VLAN_ID | OPT_VLAN_PRIO | OPT_VLAN_ENCAP)

static void brvlan_print_help(void)
{
	printf(
"vlan options:\n"
"--vlan-id [!] id       : vlan-tagged frame identifier, 0,1-4096 (integer)\n"
"--vlan-prio [!] prio   : Priority-tagged frame's user priority, 0-7 (integer)\n"
"--vlan-encap [!] encap : Encapsulated frame protocol (hexadecimal or name)\n");
}

static int
brvlan_parse(int c, char **argv, int invert, unsigned int *flags,
	       const void *entry, struct xt_entry_match **match)
{
	struct ebt_vlan_info *vlaninfo = (struct ebt_vlan_info *) (*match)->data;
	struct ethertypeent *ethent;
	char *end;
	struct ebt_vlan_info local;

	switch (c) {
	case VLAN_ID:
		EBT_CHECK_OPTION(flags, OPT_VLAN_ID);
		if (invert)
			vlaninfo->invflags |= EBT_VLAN_ID;
		local.id = strtoul(optarg, &end, 10);
		if (local.id > 4094 || *end != '\0')
			xtables_error(PARAMETER_PROBLEM, "Invalid --vlan-id range ('%s')", optarg);
		vlaninfo->id = local.id;
		vlaninfo->bitmask |= EBT_VLAN_ID;
		break;
	case VLAN_PRIO:
		EBT_CHECK_OPTION(flags, OPT_VLAN_PRIO);
		if (invert)
			vlaninfo->invflags |= EBT_VLAN_PRIO;
		local.prio = strtoul(optarg, &end, 10);
		if (local.prio >= 8 || *end != '\0')
			xtables_error(PARAMETER_PROBLEM, "Invalid --vlan-prio range ('%s')", optarg);
		vlaninfo->prio = local.prio;
		vlaninfo->bitmask |= EBT_VLAN_PRIO;
		break;
	case VLAN_ENCAP:
		EBT_CHECK_OPTION(flags, OPT_VLAN_ENCAP);
		if (invert)
			vlaninfo->invflags |= EBT_VLAN_ENCAP;
		local.encap = strtoul(optarg, &end, 16);
		if (*end != '\0') {
			ethent = getethertypebyname(optarg);
			if (ethent == NULL)
				xtables_error(PARAMETER_PROBLEM, "Unknown --vlan-encap value ('%s')", optarg);
			local.encap = ethent->e_ethertype;
		}
		if (local.encap < ETH_ZLEN)
			xtables_error(PARAMETER_PROBLEM, "Invalid --vlan-encap range ('%s')", optarg);
		vlaninfo->encap = htons(local.encap);
		vlaninfo->bitmask |= EBT_VLAN_ENCAP;
		break;
	default:
		return 0;

	}
	return 1;
}

static void brvlan_print(const void *ip, const struct xt_entry_match *match,
			 int numeric)
{
	struct ebt_vlan_info *vlaninfo = (struct ebt_vlan_info *) match->data;

	if (vlaninfo->bitmask & EBT_VLAN_ID) {
		printf("--vlan-id %s%d ", (vlaninfo->invflags & EBT_VLAN_ID) ? "! " : "", vlaninfo->id);
	}
	if (vlaninfo->bitmask & EBT_VLAN_PRIO) {
		printf("--vlan-prio %s%d ", (vlaninfo->invflags & EBT_VLAN_PRIO) ? "! " : "", vlaninfo->prio);
	}
	if (vlaninfo->bitmask & EBT_VLAN_ENCAP) {
		printf("--vlan-encap %s", (vlaninfo->invflags & EBT_VLAN_ENCAP) ? "! " : "");
		printf("%4.4X ", ntohs(vlaninfo->encap));
	}
}

static int brvlan_xlate(struct xt_xlate *xl,
			const struct xt_xlate_mt_params *params)
{
	const struct ebt_vlan_info *vlaninfo = (const void*)params->match->data;

	if (vlaninfo->bitmask & EBT_VLAN_ID)
		xt_xlate_add(xl, "vlan id %s%d ", (vlaninfo->invflags & EBT_VLAN_ID) ? "!= " : "", vlaninfo->id);

	if (vlaninfo->bitmask & EBT_VLAN_PRIO)
		xt_xlate_add(xl, "vlan pcp %s%d ", (vlaninfo->invflags & EBT_VLAN_PRIO) ? "!= " : "", vlaninfo->prio);

	if (vlaninfo->bitmask & EBT_VLAN_ENCAP)
		xt_xlate_add(xl, "vlan type %s0x%4.4x ", (vlaninfo->invflags & EBT_VLAN_ENCAP) ? "!= " : "", ntohs(vlaninfo->encap));

	return 1;
}

static struct xtables_match brvlan_match = {
	.name		= "vlan",
	.version	= XTABLES_VERSION,
	.family		= NFPROTO_BRIDGE,
	.size		= XT_ALIGN(sizeof(struct ebt_vlan_info)),
	.userspacesize	= XT_ALIGN(sizeof(struct ebt_vlan_info)),
	.help		= brvlan_print_help,
	.parse		= brvlan_parse,
	.print		= brvlan_print,
	.xlate		= brvlan_xlate,
	.extra_opts	= brvlan_opts,
};

void _init(void)
{
	xtables_register_match(&brvlan_match);
}