summaryrefslogtreecommitdiffstats
path: root/extensions/libipt_mark.c
blob: 001635a663451322f2fa6ec5766bfc4abc8944d5 (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
/* Shared library add-on to iptables to add NFMARK matching support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>

#include <iptables.h>
#include <linux/netfilter_ipv4/ipt_mark.h>

/* Function which prints out usage message. */
static void
help(void)
{
	printf(
"MARK match v%s options:\n"
"[!] --mark value[/mask]         Match nfmark value with optional mask\n"
"\n",
NETFILTER_VERSION);
}

static struct option opts[] = {
	{ "mark", 1, 0, '1' },
	{0}
};

/* Initialize the match. */
static void
init(struct ipt_entry_match *m, unsigned int *nfcache)
{
	/* Can't cache this. */
	*nfcache |= NFC_UNKNOWN;
}

/* Function which parses command options; returns true if it
   ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
      const struct ipt_entry *entry,
      unsigned int *nfcache,
      struct ipt_entry_match **match)
{
	struct ipt_mark_info *markinfo = (struct ipt_mark_info *)(*match)->data;

	switch (c) {
		char *end;
	case '1':
		if (check_inverse(optarg, &invert))
			optind++;
		markinfo->mark = strtoul(optarg, &end, 0);
		if (*end == '/') {
			markinfo->mask = strtoul(end+1, &end, 0);
		} else
			markinfo->mask = 0xffffffff;
		if (*end != '\0' || end == optarg)
			exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
		if (invert)
			markinfo->invert = 1;
		*flags = 1;
		break;

	default:
		return 0;
	}
	return 1;
}

static void
print_mark(unsigned long mark, unsigned long mask, int invert, int numeric)
{
	if (invert)
		fputc('!', stdout);

	if(mask != 0xffffffff)
		printf("0x%lx/0x%lx ", mark, mask);
	else
		printf("0x%lx ", mark);
}

/* Final check; must have specified --mark. */
static void
final_check(unsigned int flags)
{
	if (!flags)
		exit_error(PARAMETER_PROBLEM,
			   "MARK match: You must specify `--mark'");
}

/* Prints out the matchinfo. */
static void
print(const struct ipt_ip *ip,
      const struct ipt_entry_match *match,
      int numeric)
{
	printf("MARK match ");
	print_mark(((struct ipt_mark_info *)match->data)->mark,
		  ((struct ipt_mark_info *)match->data)->mask,
		  ((struct ipt_mark_info *)match->data)->invert, numeric);
}

/* Saves the union ipt_matchinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
{
	printf("--mark ");
	print_mark(((struct ipt_mark_info *)match->data)->mark,
		  ((struct ipt_mark_info *)match->data)->mask,
		  ((struct ipt_mark_info *)match->data)->invert, 0);
}

static
struct iptables_match mark
= { NULL,
    "mark",
    NETFILTER_VERSION,
    IPT_ALIGN(sizeof(struct ipt_mark_info)),
    IPT_ALIGN(sizeof(struct ipt_mark_info)),
    &help,
    &init,
    &parse,
    &final_check,
    &print,
    &save,
    opts
};

void _init(void)
{
	register_match(&mark);
}