summaryrefslogtreecommitdiffstats
path: root/examples/nft-set-add.c
blob: c9e249d09db5df39009280260a363e23b3ae1059 (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
/*
 * (C) 2013 by Pablo Neira Ayuso <pablo@netfilter.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
 */

#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <stddef.h>	/* for offsetof */
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>

#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>

#include <libmnl/libmnl.h>
#include <libnftnl/set.h>

static struct nftnl_set *setup_set(uint8_t family, const char *table,
				 const char *name)
{
	struct nftnl_set *s = NULL;

	s = nftnl_set_alloc();
	if (s == NULL) {
		perror("OOM");
		exit(EXIT_FAILURE);
	}

	nftnl_set_set_str(s, NFTNL_SET_TABLE, table);
	nftnl_set_set_str(s, NFTNL_SET_NAME, name);
	nftnl_set_set_u32(s, NFTNL_SET_FAMILY, family);
	nftnl_set_set_u32(s, NFTNL_SET_KEY_LEN, sizeof(uint16_t));
	/* inet service type, see nftables/include/datatypes.h */
	nftnl_set_set_u32(s, NFTNL_SET_KEY_TYPE, 13);
	nftnl_set_set_u32(s, NFTNL_SET_ID, 1);

	return s;
}

int main(int argc, char *argv[])
{
	struct mnl_socket *nl;
	struct nftnl_set *s;
	struct nlmsghdr *nlh;
	struct mnl_nlmsg_batch *batch;
	uint8_t family;
	char buf[MNL_SOCKET_BUFFER_SIZE];
	uint32_t seq = time(NULL);
	int ret;

	if (argc != 4) {
		fprintf(stderr, "Usage: %s <family> <table> <setname>\n", argv[0]);
		exit(EXIT_FAILURE);
	}

	if (strcmp(argv[1], "ip") == 0)
		family = NFPROTO_IPV4;
	else if (strcmp(argv[1], "ip6") == 0)
		family = NFPROTO_IPV6;
	else if (strcmp(argv[1], "inet") == 0)
		family = NFPROTO_INET;
	else if (strcmp(argv[1], "bridge") == 0)
		family = NFPROTO_BRIDGE;
	else if (strcmp(argv[1], "arp") == 0)
		family = NFPROTO_ARP;
	else {
		fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
		exit(EXIT_FAILURE);
	}

	s = setup_set(family, argv[2], argv[3]);

	nl = mnl_socket_open(NETLINK_NETFILTER);
	if (nl == NULL) {
		perror("mnl_socket_open");
		exit(EXIT_FAILURE);
	}

	if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
		perror("mnl_socket_bind");
		exit(EXIT_FAILURE);
	}

	batch = mnl_nlmsg_batch_start(buf, sizeof(buf));

	nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
	mnl_nlmsg_batch_next(batch);

	nlh = nftnl_set_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
				      NFT_MSG_NEWSET, family,
				      NLM_F_CREATE|NLM_F_ACK, seq++);

	nftnl_set_nlmsg_build_payload(nlh, s);
	nftnl_set_free(s);
	mnl_nlmsg_batch_next(batch);

	nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
	mnl_nlmsg_batch_next(batch);

	ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
				mnl_nlmsg_batch_size(batch));
	if (ret == -1) {
		perror("mnl_socket_sendto");
		exit(EXIT_FAILURE);
	}

	mnl_nlmsg_batch_stop(batch);

	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
	if (ret == -1) {
		perror("mnl_socket_recvfrom");
		exit(EXIT_FAILURE);
	}

	ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
	if (ret < 0) {
		perror("mnl_cb_run");
		exit(EXIT_FAILURE);
	}

	mnl_socket_close(nl);

	return EXIT_SUCCESS;
}