libnftnl  1.1.7
nft-table-upd.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 
23 int main(int argc, char *argv[])
24 {
25  struct mnl_socket *nl;
26  char buf[MNL_SOCKET_BUFFER_SIZE];
27  struct nlmsghdr *nlh;
28  uint32_t portid, seq, table_seq, family, flags;
29  struct nftnl_table *t = NULL;
30  struct mnl_nlmsg_batch *batch;
31  int ret;
32 
33  if (argc != 4) {
34  fprintf(stderr, "%s <family> <name> <state>\n", argv[0]);
35  exit(EXIT_FAILURE);
36  }
37 
38  t = nftnl_table_alloc();
39  if (t == NULL) {
40  perror("OOM");
41  exit(EXIT_FAILURE);
42  }
43 
44  seq = time(NULL);
45  batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
46 
47  nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
48  mnl_nlmsg_batch_next(batch);
49 
50  if (strcmp(argv[1], "ip") == 0)
51  family = NFPROTO_IPV4;
52  else if (strcmp(argv[1], "ip6") == 0)
53  family = NFPROTO_IPV6;
54  else if (strcmp(argv[1], "bridge") == 0)
55  family = NFPROTO_BRIDGE;
56  else if (strcmp(argv[1], "arp") == 0)
57  family = NFPROTO_ARP;
58  else if (strcmp(argv[1], "netdev") == 0)
59  family = NFPROTO_NETDEV;
60  else {
61  fprintf(stderr,
62  "Unknown family: ip, ip6, bridge, arp, netdev\n");
63  exit(EXIT_FAILURE);
64  }
65 
66  if (strcmp(argv[3], "active") == 0)
67  flags = 0;
68  else if (strcmp(argv[3], "dormant") == 0)
69  flags = NFT_TABLE_F_DORMANT;
70  else {
71  fprintf(stderr, "Unknown state: active, dormant\n");
72  exit(EXIT_FAILURE);
73  }
74 
75  nftnl_table_set_str(t, NFTNL_TABLE_NAME, argv[2]);
76  nftnl_table_set_u32(t, NFTNL_TABLE_FLAGS, flags);
77 
78  table_seq = seq;
79  nlh = nftnl_table_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
80  NFT_MSG_NEWTABLE, family,
81  NLM_F_ACK, seq++);
82  nftnl_table_nlmsg_build_payload(nlh, t);
83  nftnl_table_free(t);
84  mnl_nlmsg_batch_next(batch);
85 
86  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
87  mnl_nlmsg_batch_next(batch);
88 
89  nl = mnl_socket_open(NETLINK_NETFILTER);
90  if (nl == NULL) {
91  perror("mnl_socket_open");
92  exit(EXIT_FAILURE);
93  }
94 
95  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
96  perror("mnl_socket_bind");
97  exit(EXIT_FAILURE);
98  }
99  portid = mnl_socket_get_portid(nl);
100 
101  if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
102  mnl_nlmsg_batch_size(batch)) < 0) {
103  perror("mnl_socket_send");
104  exit(EXIT_FAILURE);
105  }
106 
107  mnl_nlmsg_batch_stop(batch);
108 
109  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
110  while (ret > 0) {
111  ret = mnl_cb_run(buf, ret, table_seq, portid, NULL, NULL);
112  if (ret <= 0)
113  break;
114  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
115  }
116  if (ret == -1) {
117  perror("error");
118  exit(EXIT_FAILURE);
119  }
120  mnl_socket_close(nl);
121 
122  return EXIT_SUCCESS;
123 }