summaryrefslogtreecommitdiffstats
path: root/extensions/libipt_CONNMARK.c
blob: 824c1de0a209eaa7f57a0907d05ffa3bc71bead9 (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
/* Shared library add-on to iptables to add CONNMARK target support. */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>

#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_CONNMARK.h>

#if 0
struct markinfo {
	struct ipt_entry_target t;
	struct ipt_connmark_target_info mark;
};
#endif

/* Function which prints out usage message. */
static void
help(void)
{
	printf(
"CONNMARK target v%s options:\n"
"  --set-mark value              Set conntrack mark value\n"
"  --save-mark                   Save the packet nfmark on the connection\n"
"  --restore-mark                Restore saved nfmark value\n"
"\n",
NETFILTER_VERSION);
}

static struct option opts[] = {
	{ "set-mark", 1, 0, '1' },
	{ "save-mark", 0, 0, '2' },
	{ "restore-mark", 0, 0, '3' },
	{ 0 }
};

/* Initialize the target. */
static void
init(struct ipt_entry_target *t, unsigned int *nfcache)
{
}

/* 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,
      struct ipt_entry_target **target)
{
	struct ipt_connmark_target_info *markinfo
		= (struct ipt_connmark_target_info *)(*target)->data;

	switch (c) {
		char *end;
	case '1':
		markinfo->mode = IPT_CONNMARK_SET;
		markinfo->mark = strtoul(optarg, &end, 0);
		if (*end != '\0' || end == optarg)
			exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
		if (*flags)
			exit_error(PARAMETER_PROBLEM,
			           "CONNMARK target: Can't specify --set-mark twice");
		*flags = 1;
		break;
	case '2':
		markinfo->mode = IPT_CONNMARK_SAVE;
		if (*flags)
			exit_error(PARAMETER_PROBLEM,
			           "CONNMARK target: Can't specify --save-mark twice");
		*flags = 1;
		break;
	case '3':
		markinfo->mode = IPT_CONNMARK_RESTORE;
		if (*flags)
			exit_error(PARAMETER_PROBLEM,
			           "CONNMARK target: Can't specify --restore-mark twice");
		*flags = 1;
		break;
	default:
		return 0;
	}

	return 1;
}

static void
final_check(unsigned int flags)
{
	if (!flags)
		exit_error(PARAMETER_PROBLEM,
		           "CONNMARK target: Parameter --set-mark is required");
}

static void
print_mark(unsigned long mark, int numeric)
{
	printf("0x%lx ", mark);
}

/* Prints out the targinfo. */
static void
print(const struct ipt_ip *ip,
      const struct ipt_entry_target *target,
      int numeric)
{
	const struct ipt_connmark_target_info *markinfo =
		(const struct ipt_connmark_target_info *)target->data;
	switch (markinfo->mode) {
	case IPT_CONNMARK_SET:
	    printf("CONNMARK set ");
	    print_mark(markinfo->mark, numeric);
	    break;
	case IPT_CONNMARK_SAVE:
	    printf("CONNMARK save ");
	    break;
	case IPT_CONNMARK_RESTORE:
	    printf("CONNMARK restore ");
	    break;
	default:
	    printf("ERROR: UNKNOWN CONNMARK MODE ");
	    break;
	}
}

/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
{
	const struct ipt_connmark_target_info *markinfo =
		(const struct ipt_connmark_target_info *)target->data;

	switch (markinfo->mode) {
	case IPT_CONNMARK_SET:
	    printf("--set-mark 0x%lx ", markinfo->mark);
	    break;
	case IPT_CONNMARK_SAVE:
	    printf("--save-mark ");
	    break;
	case IPT_CONNMARK_RESTORE:
	    printf("--restore-mark ");
	    break;
	default:
	    printf("ERROR: UNKNOWN CONNMARK MODE ");
	    break;
	}
}

struct iptables_target mark
= { NULL,
    "CONNMARK",
    NETFILTER_VERSION,
    IPT_ALIGN(sizeof(struct ipt_connmark_target_info)),
    IPT_ALIGN(sizeof(struct ipt_connmark_target_info)),
    &help,
    &init,
    &parse,
    &final_check,
    &print,
    &save,
    opts
};

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