libnftnl 1.2.6
nft-map-add.c
1/*
2 * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 */
9
10#include <stdlib.h>
11#include <time.h>
12#include <string.h>
13#include <stddef.h> /* for offsetof */
14#include <netinet/in.h>
15#include <netinet/ip.h>
16#include <netinet/tcp.h>
17#include <arpa/inet.h>
18#include <sys/types.h>
19#include <sys/socket.h>
20#include <errno.h>
21
22#include <linux/netfilter.h>
23#include <linux/netfilter/nfnetlink.h>
24#include <linux/netfilter/nf_tables.h>
25
26#include <libmnl/libmnl.h>
27#include <libnftnl/set.h>
28
29static struct nftnl_set *setup_set(uint8_t family, const char *table,
30 const char *name)
31{
32 struct nftnl_set *s = NULL;
33
34 s = nftnl_set_alloc();
35 if (s == NULL) {
36 perror("OOM");
37 exit(EXIT_FAILURE);
38 }
39
40 nftnl_set_set_str(s, NFTNL_SET_TABLE, table);
41 nftnl_set_set_str(s, NFTNL_SET_NAME, name);
42 nftnl_set_set_u32(s, NFTNL_SET_FAMILY, family);
43 nftnl_set_set_u32(s, NFTNL_SET_KEY_LEN, 2);
44 /* See nftables/include/datatype.h, where TYPE_INET_SERVICE is 13. We
45 * should place these datatypes in a public header so third party
46 * applications still work with nftables.
47 */
48 nftnl_set_set_u32(s, NFTNL_SET_KEY_TYPE, 13);
49 nftnl_set_set_u32(s, NFTNL_SET_DATA_LEN, 2);
50 nftnl_set_set_u32(s, NFTNL_SET_DATA_TYPE, 13);
51 nftnl_set_set_u32(s, NFTNL_SET_ID, 1);
52 nftnl_set_set_u32(s, NFTNL_SET_FLAGS, NFT_SET_CONSTANT | NFT_SET_MAP);
53
54 return s;
55}
56
57int main(int argc, char *argv[])
58{
59 struct mnl_socket *nl;
60 struct nftnl_set *s;
61 struct nlmsghdr *nlh;
62 struct mnl_nlmsg_batch *batch;
63 uint8_t family;
64 char buf[MNL_SOCKET_BUFFER_SIZE];
65 uint32_t seq = time(NULL);
66 int ret;
67
68 if (argc != 4) {
69 fprintf(stderr, "Usage: %s <family> <table> <setname>\n", argv[0]);
70 exit(EXIT_FAILURE);
71 }
72
73 if (strcmp(argv[1], "ip") == 0)
74 family = NFPROTO_IPV4;
75 else if (strcmp(argv[1], "ip6") == 0)
76 family = NFPROTO_IPV6;
77 else if (strcmp(argv[1], "inet") == 0)
78 family = NFPROTO_INET;
79 else if (strcmp(argv[1], "bridge") == 0)
80 family = NFPROTO_BRIDGE;
81 else if (strcmp(argv[1], "arp") == 0)
82 family = NFPROTO_ARP;
83 else {
84 fprintf(stderr, "Unknown family: ip, ip6, bridge, arp\n");
85 exit(EXIT_FAILURE);
86 }
87
88 s = setup_set(family, argv[2], argv[3]);
89
90 nl = mnl_socket_open(NETLINK_NETFILTER);
91 if (nl == NULL) {
92 perror("mnl_socket_open");
93 exit(EXIT_FAILURE);
94 }
95
96 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
97 perror("mnl_socket_bind");
98 exit(EXIT_FAILURE);
99 }
100
101 batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
102
103 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
104 mnl_nlmsg_batch_next(batch);
105
106 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
107 NFT_MSG_NEWSET, family,
108 NLM_F_CREATE | NLM_F_ACK, seq++);
109
110 nftnl_set_nlmsg_build_payload(nlh, s);
111 nftnl_set_free(s);
112 mnl_nlmsg_batch_next(batch);
113
114 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
115 mnl_nlmsg_batch_next(batch);
116
117 ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
118 mnl_nlmsg_batch_size(batch));
119 if (ret == -1) {
120 perror("mnl_socket_sendto");
121 exit(EXIT_FAILURE);
122 }
123
124 mnl_nlmsg_batch_stop(batch);
125
126 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
127 if (ret == -1) {
128 perror("mnl_socket_recvfrom");
129 exit(EXIT_FAILURE);
130 }
131
132 ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
133 if (ret < 0) {
134 perror("mnl_cb_run");
135 exit(EXIT_FAILURE);
136 }
137
138 mnl_socket_close(nl);
139
140 return EXIT_SUCCESS;
141}