libnftnl  1.2.9
nft-table-upd.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 int main(int argc, char *argv[])
20 {
21  struct mnl_socket *nl;
22  char buf[MNL_SOCKET_BUFFER_SIZE];
23  struct nlmsghdr *nlh;
24  uint32_t portid, seq, table_seq, family, flags;
25  struct nftnl_table *t = NULL;
26  struct mnl_nlmsg_batch *batch;
27  int ret;
28 
29  if (argc != 4) {
30  fprintf(stderr, "%s <family> <name> <state>\n", argv[0]);
31  exit(EXIT_FAILURE);
32  }
33 
34  t = nftnl_table_alloc();
35  if (t == NULL) {
36  perror("OOM");
37  exit(EXIT_FAILURE);
38  }
39 
40  seq = time(NULL);
41  batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
42 
43  nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
44  mnl_nlmsg_batch_next(batch);
45 
46  if (strcmp(argv[1], "ip") == 0)
47  family = NFPROTO_IPV4;
48  else if (strcmp(argv[1], "ip6") == 0)
49  family = NFPROTO_IPV6;
50  else if (strcmp(argv[1], "inet") == 0)
51  family = NFPROTO_INET;
52  else if (strcmp(argv[1], "bridge") == 0)
53  family = NFPROTO_BRIDGE;
54  else if (strcmp(argv[1], "arp") == 0)
55  family = NFPROTO_ARP;
56  else if (strcmp(argv[1], "netdev") == 0)
57  family = NFPROTO_NETDEV;
58  else {
59  fprintf(stderr,
60  "Unknown family: ip, ip6, inet, bridge, arp, netdev\n");
61  exit(EXIT_FAILURE);
62  }
63 
64  if (strcmp(argv[3], "active") == 0)
65  flags = 0;
66  else if (strcmp(argv[3], "dormant") == 0)
67  flags = NFT_TABLE_F_DORMANT;
68  else {
69  fprintf(stderr, "Unknown state: active, dormant\n");
70  exit(EXIT_FAILURE);
71  }
72 
73  nftnl_table_set_str(t, NFTNL_TABLE_NAME, argv[2]);
74  nftnl_table_set_u32(t, NFTNL_TABLE_FLAGS, flags);
75 
76  table_seq = seq;
77  nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
78  NFT_MSG_NEWTABLE, family, NLM_F_ACK, seq++);
79  nftnl_table_nlmsg_build_payload(nlh, t);
80  nftnl_table_free(t);
81  mnl_nlmsg_batch_next(batch);
82 
83  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
84  mnl_nlmsg_batch_next(batch);
85 
86  nl = mnl_socket_open(NETLINK_NETFILTER);
87  if (nl == NULL) {
88  perror("mnl_socket_open");
89  exit(EXIT_FAILURE);
90  }
91 
92  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
93  perror("mnl_socket_bind");
94  exit(EXIT_FAILURE);
95  }
96  portid = mnl_socket_get_portid(nl);
97 
98  if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
99  mnl_nlmsg_batch_size(batch)) < 0) {
100  perror("mnl_socket_send");
101  exit(EXIT_FAILURE);
102  }
103 
104  mnl_nlmsg_batch_stop(batch);
105 
106  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
107  while (ret > 0) {
108  ret = mnl_cb_run(buf, ret, table_seq, portid, NULL, NULL);
109  if (ret <= 0)
110  break;
111  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
112  }
113  if (ret == -1) {
114  perror("error");
115  exit(EXIT_FAILURE);
116  }
117  mnl_socket_close(nl);
118 
119  return EXIT_SUCCESS;
120 }