summaryrefslogtreecommitdiffstats
path: root/input/flow/ulogd_inpflow_NFCT.c
blob: 9ce4218732489f1dc7e7854253a40b7d7f91d242 (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
260
261
262
263
264
265
266
267
268
/* ulogd_input_CTNL.c, Version $Revision$
 *
 * ulogd input plugin for ctnetlink
 *
 * (C) 2005 by Harald Welte <laforge@gnumonks.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation
 */

#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include <ulogd/ulogd.h>
#include <ulogd/ipfix_protocol.h>

#include <libnetfilter_conntrack/libnetfilter_conntrack.h>

struct nfct_pluginstance {
	struct nfct_handle *cth;
	struct ulogd_fd nfct_fd;
};


static struct ulogd_key nfct_okeys[] = {
	{
		.type 	= ULOGD_RET_IPADDR,
		.flags 	= ULOGD_RETF_NONE,
		.name	= "ip.saddr",
		.ipfix	= { 
			.vendor = IPFIX_VENDOR_IETF,
			.field_id = IPFIX_sourceIPv4Address,
		},
	},
	{
		.type	= ULOGD_RET_IPADDR,
		.flags	= ULOGD_RETF_NONE,
		.name	= "ip.daddr",
		.ipfix	= {
			.vendor = IPFIX_VENDOR_IETF,
			.field_id = IPFIX_destinationIPv4Address,
		},
	},
	{
		.type	= ULOGD_RET_UINT8,
		.flags	= ULOGD_RETF_NONE,
		.name	= "ip.protocol",
		.ipfix	= { 
			.vendor = IPFIX_VENDOR_IETF,
			.field_id = IPFIX_protocolIdentifier,
		},
	},
	{
		.type	= ULOGD_RET_UINT16,
		.flags 	= ULOGD_RETF_NONE,
		.name	= "tcp.sport",
		.ipfix	= {
			.vendor 	= IPFIX_VENDOR_IETF,
			.field_id 	= IPFIX_sourceTransportPort,
		},
	},
	{
		.type	= ULOGD_RET_UINT16,
		.flags 	= ULOGD_RETF_NONE,
		.name	= "tcp.dport",
		.ipfix	= {
			.vendor 	= IPFIX_VENDOR_IETF,
			.field_id 	= IPFIX_destinationTransportPort,
		},
	},
	{
		.type = ULOGD_RET_UINT32,
		.flags = ULOGD_RETF_NONE,
		.name = "raw.pktlen",
		.ipfix = { 
			.vendor 	= IPFIX_VENDOR_IETF,
			.field_id 	= IPFIX_octetTotalCount,
			/* FIXME: this could also be octetDeltaCount */
		},
	},
	{
		.type = ULOGD_RET_UINT32,
		.flags = ULOGD_RETF_NONE,
		.name = "raw.pktcount",
		.ipfix = { 
			.vendor 	= IPFIX_VENDOR_IETF,
			.field_id 	= IPFIX_packetTotalCount,
			/* FIXME: this could also be packetDeltaCount */
		},
	},
	{
		.type = ULOGD_RET_UINT8,
		.flags = ULOGD_RETF_NONE,
		.name = "icmp.code",
		.ipfix = {
			.vendor		= IPFIX_VENDOR_IETF,
			.field_id	= IPFIX_icmpCodeIPv4,
		},
	},
	{
		.type = ULOGD_RET_UINT8,
		.flags = ULOGD_RETF_NONE,
		.name = "icmp.type",
		.ipfix = {
			.vendor		= IPFIX_VENDOR_IETF,
			.field_id	= IPFIX_icmpTypeIPv4,
		},
	},

};

static int propagate_ct_flow(struct ulogd_pluginstance *upi, 
		             struct nfct_conntrack *ct,
			     unsigned int flags,
			     int dir)
{
	struct ulogd_key *ret = upi->output;

	ret[0].u.value.ui32 = htonl(ct->tuple[dir].src.v4);
	ret[0].flags |= ULOGD_RETF_VALID;

	ret[1].u.value.ui32 = htonl(ct->tuple[dir].dst.v4);
	ret[1].flags |= ULOGD_RETF_VALID;

	ret[2].u.value.ui8 = ct->tuple[dir].protonum;
	ret[2].flags |= ULOGD_RETF_VALID;

	switch (ct->tuple[1].protonum) {
	case IPPROTO_TCP:
	case IPPROTO_UDP:
	case IPPROTO_SCTP:
		/* FIXME: DCCP */
		ret[3].u.value.ui16 = htons(ct->tuple[dir].l4src.tcp.port);
		ret[3].flags |= ULOGD_RETF_VALID;
		ret[4].u.value.ui16 = htons(ct->tuple[dir].l4dst.tcp.port);
		ret[4].flags |= ULOGD_RETF_VALID;
		break;
	case IPPROTO_ICMP:
		ret[7].u.value.ui8 = ct->tuple[dir].l4src.icmp.code;
		ret[7].flags |= ULOGD_RETF_VALID;
		ret[8].u.value.ui8 = ct->tuple[dir].l4src.icmp.type;
		ret[8].flags |= ULOGD_RETF_VALID;
		break;
	}

	if ((dir == NFCT_DIR_ORIGINAL && flags & NFCT_COUNTERS_ORIG) ||
	    (dir == NFCT_DIR_REPLY && flags & NFCT_COUNTERS_RPLY)) {
		ret[5].u.value.ui64 = ct->counters[dir].bytes;
		ret[5].flags |= ULOGD_RETF_VALID;

		ret[6].u.value.ui64 = ct->counters[dir].packets;
		ret[6].flags |= ULOGD_RETF_VALID;
	}
	
	ulogd_propagate_results(upi);

	return 0;
}

static int propagate_ct(struct ulogd_pluginstance *upi,
			struct nfct_conntrack *ct,
			unsigned int flags)
{
	int rc;

	rc = propagate_ct_flow(upi, ct, flags, NFCT_DIR_ORIGINAL);
	if (rc < 0)
		return rc;
	return propagate_ct_flow(upi, ct, flags, NFCT_DIR_REPLY);
}

static int event_handler(void *arg, unsigned int flags, int type,
			 void *data)
{
	struct nfct_conntrack *ct = arg;
	struct ulogd_pluginstance *upi = data;

	if (type == NFCT_MSG_NEW) {
		/* FIXME: build hash table with timestamp of start of
		 * connection */
	} else if (type == NFCT_MSG_DESTROY) {
		/* We have the final count of bytes for this connection */
		return propagate_ct(upi, ct, flags);
	}

	return 0;
}

static int read_cb_nfct(int fd, unsigned int what, void *param)
{
	struct nfct_pluginstance *cpi = 
				(struct nfct_pluginstance *) param;

	if (!(what & ULOGD_FD_READ))
		return 0;

	/* FIXME: implement this */
	nfct_event_conntrack(cpi->cth);
	return 0;
}

static int constructor_nfct(struct ulogd_pluginstance *upi)
{
	struct nfct_pluginstance *cpi = 
			(struct nfct_pluginstance *)upi->private;

	memset(cpi, 0, sizeof(*cpi));

	/* FIXME: make eventmask configurable */
	cpi->cth = nfct_open(NFNL_SUBSYS_CTNETLINK, NF_NETLINK_CONNTRACK_NEW|
			     NF_NETLINK_CONNTRACK_DESTROY);
	if (!cpi->cth) {
		ulogd_log(ULOGD_FATAL, "error opening ctnetlink\n");
		return -1;
	}

	nfct_register_callback(cpi->cth, &event_handler, upi);

	cpi->nfct_fd.fd = nfct_fd(cpi->cth);
	cpi->nfct_fd.cb = &read_cb_nfct;
	cpi->nfct_fd.data = cpi;
	cpi->nfct_fd.when = ULOGD_FD_READ;

	ulogd_register_fd(&cpi->nfct_fd);
	
	return 0;
}


static int destructor_nfct(struct ulogd_pluginstance *pi)
{
	struct nfct_pluginstance *cpi = (void *) pi;
	int rc;

	rc = nfct_close(cpi->cth);
	if (rc < 0)
		return rc;

	return 0;
}

static struct ulogd_plugin nfct_plugin = {
	.name = "NFCT",
	.input = {
		.type = ULOGD_DTYPE_SOURCE,
	},
	.output = {
		.keys = nfct_okeys,
		.num_keys = ARRAY_SIZE(nfct_okeys),
		.type = ULOGD_DTYPE_FLOW,
	},
	.config_kset 	= NULL,
	.interp 	= NULL,
	.configure	= NULL,
	.start		= &constructor_nfct,
	.stop		= &destructor_nfct,
	.priv_size	= sizeof(struct nfct_pluginstance),
};

void __attribute__ ((constructor)) init(void);

void init(void)
{
	ulogd_register_plugin(&nfct_plugin);
}