summaryrefslogtreecommitdiffstats
path: root/extensions/libipt_CLUSTERIP.c
blob: 55e86c5ccab6689f1d7e2a4d1e5a246073d41be4 (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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
/* Shared library add-on to iptables to add CLUSTERIP target support. 
 * (C) 2003 by Harald Welte <laforge@gnumonks.org>
 *
 * Development of this code was funded by SuSE AG, http://www.suse.com/
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>

#if defined(__GLIBC__) && __GLIBC__ == 2
#include <net/ethernet.h>
#else
#include <linux/if_ether.h>
#endif

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

static void
help(void)
{
	printf(
"CLUSTERIP target v%s options:\n"
"  --new			 Create a new ClusterIP\n"
"  --hashmode <mode>		 Specify hashing mode\n"
"					sourceip\n"
"					sourceip-sourceport\n"
"					sourceip-sourceport-destport\n"
"  --clustermac <mac>		 Set clusterIP MAC address\n"
"  --total-nodes <num>		 Set number of total nodes in cluster\n"
"  --local-node <num>		 Set the local node number\n"
"  --hash-init\n"
"\n",
IPTABLES_VERSION);
}

static struct option opts[] = {
	{ "new", 0, 0, '1' },
	{ "hashmode", 1, 0, '2' },
	{ "clustermac", 1, 0, '3' },
	{ "total-nodes", 1, 0, '4' },
	{ "local-node", 1, 0, '5' },
	{ 0 }
};

static void
init(struct ipt_entry_target *t, unsigned int *nfcache)
{
}

static void
parse_mac(const char *mac, char *macbuf)
{
	unsigned int i = 0;

	if (strlen(mac) != ETH_ALEN*3-1)
		exit_error(PARAMETER_PROBLEM, "Bad mac address `%s'", mac);

	for (i = 0; i < ETH_ALEN; i++) {
		long number;
		char *end;

		number = strtol(mac + i*3, &end, 16);

		if (end == mac + i*3 + 2
		    && number >= 0
		    && number <= 255)
			macbuf[i] = number;
		else
			exit_error(PARAMETER_PROBLEM,
				   "Bad mac address `%s'", mac);
	}
}

#define	PARAM_NEW	0x0001
#define PARAM_HMODE	0x0002
#define PARAM_MAC	0x0004
#define PARAM_TOTALNODE	0x0008
#define PARAM_LOCALNODE	0x0010

static int
parse(int c, char **argv, int invert, unsigned int *flags,
      const struct ipt_entry *entry,
      struct ipt_entry_target **target)
{
	struct ipt_clusterip_tgt_info *cipinfo
		= (struct ipt_clusterip_tgt_info *)(*target)->data;

	switch (c) {
		unsigned int num;
	case '1':
		cipinfo->flags |= CLUSTERIP_FLAG_NEW;
		if (*flags & PARAM_NEW)
			exit_error(PARAMETER_PROBLEM, "Can only specify `--new' once\n");
		*flags |= PARAM_NEW;
		break;
	case '2':
		if (!(*flags & PARAM_NEW))
			exit_error(PARAMETER_PROBLEM, "Can only specify hashmode combined with `--new'\n");
		if (*flags & PARAM_HMODE)
			exit_error(PARAMETER_PROBLEM, "Can only specify hashmode once\n");
		if (!strcmp(optarg, "sourceip"))
			cipinfo->hash_mode = CLUSTERIP_HASHMODE_SIP;
		else if (!strcmp(optarg, "sourceip-sourceport"))
			cipinfo->hash_mode = CLUSTERIP_HASHMODE_SIP_SPT;
		else if (!strcmp(optarg, "sourceip-sourceport-destport"))
			cipinfo->hash_mode = CLUSTERIP_HASHMODE_SIP_SPT_DPT;
		else
			exit_error(PARAMETER_PROBLEM, "Unknown hashmode `%s'\n",
				   optarg);
		*flags |= PARAM_HMODE;
		break;
	case '3':
		if (!(*flags & PARAM_NEW))
			exit_error(PARAMETER_PROBLEM, "Can only specify MAC combined with `--new'\n");
		if (*flags & PARAM_MAC)
			exit_error(PARAMETER_PROBLEM, "Can only specify MAC once\n");
		parse_mac(optarg, cipinfo->clustermac);
		if (!(cipinfo->clustermac[0] & 0x01))
			exit_error(PARAMETER_PROBLEM, "MAC has to be a multicast ethernet address\n");
		*flags |= PARAM_MAC;
		break;
	case '4':
		if (!(*flags & PARAM_NEW))
			exit_error(PARAMETER_PROBLEM, "Can only specify node number combined with `--new'\n");
		if (*flags & PARAM_TOTALNODE)
			exit_error(PARAMETER_PROBLEM, "Can only specify total node number once\n");
		if (string_to_number(optarg, 1, CLUSTERIP_MAX_NODES, &num) < 0)
			exit_error(PARAMETER_PROBLEM, "Unable to parse `%s'\n", optarg);
		cipinfo->num_total_nodes = (u_int16_t)num;
		*flags |= PARAM_TOTALNODE;
		break;
	case '5':
		if (!(*flags & PARAM_NEW))
			exit_error(PARAMETER_PROBLEM, "Can only specify node number combined with `--new'\n");
		if (*flags & PARAM_LOCALNODE)
			exit_error(PARAMETER_PROBLEM, "Can only specify local node number once\n");
		if (string_to_number(optarg, 1, CLUSTERIP_MAX_NODES, &num) < 0)
			exit_error(PARAMETER_PROBLEM, "Unable to parse `%s'\n", optarg);
		cipinfo->num_local_nodes = 1;
		cipinfo->local_nodes[0] = (u_int16_t)num;
		*flags |= PARAM_LOCALNODE;
		break;
	default:
		return 0;
	}

	return 1;
}

static void
final_check(unsigned int flags)
{
	if (flags == 0)
		return;

	if (flags == (PARAM_NEW|PARAM_HMODE|PARAM_MAC|PARAM_TOTALNODE|PARAM_LOCALNODE))
		return;

	exit_error(PARAMETER_PROBLEM, "CLUSTERIP target: Invalid parameter combination\n");
}

static char *hashmode2str(enum clusterip_hashmode mode)
{
	char *retstr;
	switch (mode) {
		case CLUSTERIP_HASHMODE_SIP:
			retstr = "sourceip";
			break;
		case CLUSTERIP_HASHMODE_SIP_SPT:
			retstr = "sourceip-sourceport";
			break;
		case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
			retstr = "sourceip-sourceport-destport";
			break;
		default:
			retstr = "unknown-error";
			break;
	}
	return retstr;
}

static char *mac2str(u_int8_t mac[ETH_ALEN])
{
	static char buf[ETH_ALEN*3];
	sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
		mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
	return buf;
}
			

/* Prints out the targinfo. */
static void
print(const struct ipt_ip *ip,
      const struct ipt_entry_target *target,
      int numeric)
{
	const struct ipt_clusterip_tgt_info *cipinfo =
		(const struct ipt_clusterip_tgt_info *)target->data;
	
	if (!cipinfo->flags & CLUSTERIP_FLAG_NEW) {
		printf("CLUSTERIP");
		return;
	}

	printf("CLUSTERIP hashmode=%s clustermac=%s total_nodes=%u local_node=%u ", 
		hashmode2str(cipinfo->hash_mode),
		mac2str(cipinfo->clustermac),
		cipinfo->num_total_nodes,
		cipinfo->local_nodes[0]);
}

/* 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;
	}
	*/
}

static
struct iptables_target clusterip
= { NULL,
    "CLUSTERIP",
    IPTABLES_VERSION,
    IPT_ALIGN(sizeof(struct ipt_clusterip_tgt_info)),
    IPT_ALIGN(sizeof(struct ipt_clusterip_tgt_info)),
    &help,
    &init,
    &parse,
    &final_check,
    &print,
    &save,
    opts
};

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