libnftnl  1.1.7
nft-set-del.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/set.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  struct mnl_nlmsg_batch *batch;
29  uint32_t portid, seq, family;
30  struct nftnl_set *t = NULL;
31  int ret;
32 
33  if (argc != 4) {
34  fprintf(stderr, "%s <family> <table> <set>\n", argv[0]);
35  exit(EXIT_FAILURE);
36  }
37 
38  t = nftnl_set_alloc();
39  if (t == NULL) {
40  perror("OOM");
41  exit(EXIT_FAILURE);
42  }
43 
44  seq = time(NULL);
45  if (strcmp(argv[1], "ip") == 0)
46  family = NFPROTO_IPV4;
47  else if (strcmp(argv[1], "ip6") == 0)
48  family = NFPROTO_IPV6;
49  else if (strcmp(argv[1], "bridge") == 0)
50  family = NFPROTO_BRIDGE;
51  else if (strcmp(argv[1], "arp") == 0)
52  family = NFPROTO_ARP;
53  else {
54  fprintf(stderr, "Unknown family: ip, ip6, bridge, arp\n");
55  exit(EXIT_FAILURE);
56  }
57 
58  batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
59 
60  nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
61  mnl_nlmsg_batch_next(batch);
62 
63  nlh = nftnl_set_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
64  NFT_MSG_DELSET, family,
65  NLM_F_ACK, seq);
66  nftnl_set_set_str(t, NFTNL_SET_TABLE, argv[2]);
67  nftnl_set_set_str(t, NFTNL_SET_NAME, argv[3]);
68 
69  nftnl_set_nlmsg_build_payload(nlh, t);
70  nftnl_set_free(t);
71  mnl_nlmsg_batch_next(batch);
72 
73  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
74  mnl_nlmsg_batch_next(batch);
75 
76  nl = mnl_socket_open(NETLINK_NETFILTER);
77  if (nl == NULL) {
78  perror("mnl_socket_open");
79  exit(EXIT_FAILURE);
80  }
81 
82  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
83  perror("mnl_socket_bind");
84  exit(EXIT_FAILURE);
85  }
86  portid = mnl_socket_get_portid(nl);
87 
88  ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
89  mnl_nlmsg_batch_size(batch));
90  if (ret < 0) {
91  perror("mnl_socket_send");
92  exit(EXIT_FAILURE);
93  }
94 
95  mnl_nlmsg_batch_stop(batch);
96 
97  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
98  while (ret < 0) {
99  perror("mnl_socket_recvfrom");
100  exit(EXIT_FAILURE);
101  }
102 
103  ret = mnl_cb_run(buf, ret, 0, portid, NULL, NULL);
104  if (ret < 0) {
105  perror("mnl_cb_run");
106  exit(EXIT_FAILURE);
107  }
108  mnl_socket_close(nl);
109 
110  return EXIT_SUCCESS;
111 }