libnftnl  1.2.9
nft-table-add.c
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
4  *
5  * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
6  */
7 
8 #include <stdlib.h>
9 #include <time.h>
10 #include <string.h>
11 #include <netinet/in.h>
12 
13 #include <linux/netfilter.h>
14 #include <linux/netfilter/nf_tables.h>
15 
16 #include <libmnl/libmnl.h>
17 #include <libnftnl/table.h>
18 
19 static struct nftnl_table *table_add_parse(int argc, char *argv[])
20 {
21  struct nftnl_table *t;
22  uint16_t family;
23 
24  if (strcmp(argv[1], "ip") == 0)
25  family = NFPROTO_IPV4;
26  else if (strcmp(argv[1], "ip6") == 0)
27  family = NFPROTO_IPV6;
28  else if (strcmp(argv[1], "inet") == 0)
29  family = NFPROTO_INET;
30  else if (strcmp(argv[1], "bridge") == 0)
31  family = NFPROTO_BRIDGE;
32  else if (strcmp(argv[1], "arp") == 0)
33  family = NFPROTO_ARP;
34  else {
35  fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
36  return NULL;
37  }
38 
39  t = nftnl_table_alloc();
40  if (t == NULL) {
41  perror("OOM");
42  return NULL;
43  }
44 
45  nftnl_table_set_u32(t, NFTNL_TABLE_FAMILY, family);
46  nftnl_table_set_str(t, NFTNL_TABLE_NAME, argv[2]);
47 
48  return t;
49 }
50 
51 int main(int argc, char *argv[])
52 {
53  struct mnl_socket *nl;
54  char buf[MNL_SOCKET_BUFFER_SIZE];
55  struct nlmsghdr *nlh;
56  uint32_t portid, seq, table_seq, family;
57  struct nftnl_table *t;
58  struct mnl_nlmsg_batch *batch;
59  int ret;
60 
61  if (argc != 3) {
62  fprintf(stderr, "%s <family> <name>\n", argv[0]);
63  exit(EXIT_FAILURE);
64  }
65 
66  t = table_add_parse(argc, argv);
67  if (t == NULL)
68  exit(EXIT_FAILURE);
69 
70  seq = time(NULL);
71  batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
72 
73  nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
74  mnl_nlmsg_batch_next(batch);
75 
76  table_seq = seq;
77  family = nftnl_table_get_u32(t, NFTNL_TABLE_FAMILY);
78  nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
79  NFT_MSG_NEWTABLE, family,
80  NLM_F_CREATE | NLM_F_ACK, seq++);
81  nftnl_table_nlmsg_build_payload(nlh, t);
82  nftnl_table_free(t);
83  mnl_nlmsg_batch_next(batch);
84 
85  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
86  mnl_nlmsg_batch_next(batch);
87 
88  nl = mnl_socket_open(NETLINK_NETFILTER);
89  if (nl == NULL) {
90  perror("mnl_socket_open");
91  exit(EXIT_FAILURE);
92  }
93 
94  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
95  perror("mnl_socket_bind");
96  exit(EXIT_FAILURE);
97  }
98  portid = mnl_socket_get_portid(nl);
99 
100  if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
101  mnl_nlmsg_batch_size(batch)) < 0) {
102  perror("mnl_socket_send");
103  exit(EXIT_FAILURE);
104  }
105 
106  mnl_nlmsg_batch_stop(batch);
107 
108  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
109  while (ret > 0) {
110  ret = mnl_cb_run(buf, ret, table_seq, portid, NULL, NULL);
111  if (ret <= 0)
112  break;
113  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
114  }
115  if (ret == -1) {
116  perror("error");
117  exit(EXIT_FAILURE);
118  }
119  mnl_socket_close(nl);
120 
121  return EXIT_SUCCESS;
122 }