libnftnl  1.2.3
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], "inet") == 0)
55  family = NFPROTO_INET;
56  else if (strcmp(argv[1], "bridge") == 0)
57  family = NFPROTO_BRIDGE;
58  else if (strcmp(argv[1], "arp") == 0)
59  family = NFPROTO_ARP;
60  else if (strcmp(argv[1], "netdev") == 0)
61  family = NFPROTO_NETDEV;
62  else {
63  fprintf(stderr,
64  "Unknown family: ip, ip6, inet, bridge, arp, netdev\n");
65  exit(EXIT_FAILURE);
66  }
67 
68  if (strcmp(argv[3], "active") == 0)
69  flags = 0;
70  else if (strcmp(argv[3], "dormant") == 0)
71  flags = NFT_TABLE_F_DORMANT;
72  else {
73  fprintf(stderr, "Unknown state: active, dormant\n");
74  exit(EXIT_FAILURE);
75  }
76 
77  nftnl_table_set_str(t, NFTNL_TABLE_NAME, argv[2]);
78  nftnl_table_set_u32(t, NFTNL_TABLE_FLAGS, flags);
79 
80  table_seq = seq;
81  nlh = nftnl_table_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
82  NFT_MSG_NEWTABLE, family,
83  NLM_F_ACK, seq++);
84  nftnl_table_nlmsg_build_payload(nlh, t);
85  nftnl_table_free(t);
86  mnl_nlmsg_batch_next(batch);
87 
88  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
89  mnl_nlmsg_batch_next(batch);
90 
91  nl = mnl_socket_open(NETLINK_NETFILTER);
92  if (nl == NULL) {
93  perror("mnl_socket_open");
94  exit(EXIT_FAILURE);
95  }
96 
97  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
98  perror("mnl_socket_bind");
99  exit(EXIT_FAILURE);
100  }
101  portid = mnl_socket_get_portid(nl);
102 
103  if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
104  mnl_nlmsg_batch_size(batch)) < 0) {
105  perror("mnl_socket_send");
106  exit(EXIT_FAILURE);
107  }
108 
109  mnl_nlmsg_batch_stop(batch);
110 
111  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
112  while (ret > 0) {
113  ret = mnl_cb_run(buf, ret, table_seq, portid, NULL, NULL);
114  if (ret <= 0)
115  break;
116  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
117  }
118  if (ret == -1) {
119  perror("error");
120  exit(EXIT_FAILURE);
121  }
122  mnl_socket_close(nl);
123 
124  return EXIT_SUCCESS;
125 }