libnftnl 1.2.6
nft-table-add.c
1/*
2 * (C) 2012 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 * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
10 */
11
12#include <stdlib.h>
13#include <time.h>
14#include <string.h>
15#include <netinet/in.h>
16
17#include <linux/netfilter.h>
18#include <linux/netfilter/nf_tables.h>
19
20#include <libmnl/libmnl.h>
21#include <libnftnl/table.h>
22
23static struct nftnl_table *table_add_parse(int argc, char *argv[])
24{
25 struct nftnl_table *t;
26 uint16_t family;
27
28 if (strcmp(argv[1], "ip") == 0)
29 family = NFPROTO_IPV4;
30 else if (strcmp(argv[1], "ip6") == 0)
31 family = NFPROTO_IPV6;
32 else if (strcmp(argv[1], "inet") == 0)
33 family = NFPROTO_INET;
34 else if (strcmp(argv[1], "bridge") == 0)
35 family = NFPROTO_BRIDGE;
36 else if (strcmp(argv[1], "arp") == 0)
37 family = NFPROTO_ARP;
38 else {
39 fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
40 return NULL;
41 }
42
43 t = nftnl_table_alloc();
44 if (t == NULL) {
45 perror("OOM");
46 return NULL;
47 }
48
49 nftnl_table_set_u32(t, NFTNL_TABLE_FAMILY, family);
50 nftnl_table_set_str(t, NFTNL_TABLE_NAME, argv[2]);
51
52 return t;
53}
54
55int main(int argc, char *argv[])
56{
57 struct mnl_socket *nl;
58 char buf[MNL_SOCKET_BUFFER_SIZE];
59 struct nlmsghdr *nlh;
60 uint32_t portid, seq, table_seq, family;
61 struct nftnl_table *t;
62 struct mnl_nlmsg_batch *batch;
63 int ret;
64
65 if (argc != 3) {
66 fprintf(stderr, "%s <family> <name>\n", argv[0]);
67 exit(EXIT_FAILURE);
68 }
69
70 t = table_add_parse(argc, argv);
71 if (t == NULL)
72 exit(EXIT_FAILURE);
73
74 seq = time(NULL);
75 batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
76
77 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
78 mnl_nlmsg_batch_next(batch);
79
80 table_seq = seq;
81 family = nftnl_table_get_u32(t, NFTNL_TABLE_FAMILY);
82 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
83 NFT_MSG_NEWTABLE, family,
84 NLM_F_CREATE | NLM_F_ACK, seq++);
85 nftnl_table_nlmsg_build_payload(nlh, t);
86 nftnl_table_free(t);
87 mnl_nlmsg_batch_next(batch);
88
89 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
90 mnl_nlmsg_batch_next(batch);
91
92 nl = mnl_socket_open(NETLINK_NETFILTER);
93 if (nl == NULL) {
94 perror("mnl_socket_open");
95 exit(EXIT_FAILURE);
96 }
97
98 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
99 perror("mnl_socket_bind");
100 exit(EXIT_FAILURE);
101 }
102 portid = mnl_socket_get_portid(nl);
103
104 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
105 mnl_nlmsg_batch_size(batch)) < 0) {
106 perror("mnl_socket_send");
107 exit(EXIT_FAILURE);
108 }
109
110 mnl_nlmsg_batch_stop(batch);
111
112 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
113 while (ret > 0) {
114 ret = mnl_cb_run(buf, ret, table_seq, portid, NULL, NULL);
115 if (ret <= 0)
116 break;
117 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
118 }
119 if (ret == -1) {
120 perror("error");
121 exit(EXIT_FAILURE);
122 }
123 mnl_socket_close(nl);
124
125 return EXIT_SUCCESS;
126}