libnftnl  1.2.9
nft-chain-del.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/chain.h>
18 
19 static struct nftnl_chain *chain_del_parse(int argc, char *argv[])
20 {
21  struct nftnl_chain *t;
22 
23  t = nftnl_chain_alloc();
24  if (t == NULL) {
25  perror("OOM");
26  return NULL;
27  }
28 
29  nftnl_chain_set_str(t, NFTNL_CHAIN_TABLE, argv[2]);
30  nftnl_chain_set_str(t, NFTNL_CHAIN_NAME, argv[3]);
31 
32  return t;
33 }
34 
35 int main(int argc, char *argv[])
36 {
37  struct mnl_socket *nl;
38  struct mnl_nlmsg_batch *batch;
39  char buf[MNL_SOCKET_BUFFER_SIZE];
40  struct nlmsghdr *nlh;
41  uint32_t portid, seq, chain_seq;
42  struct nftnl_chain *t;
43  int ret, family;
44 
45  if (argc != 4) {
46  fprintf(stderr, "Usage: %s <family> <table> <chain>\n",
47  argv[0]);
48  exit(EXIT_FAILURE);
49  }
50 
51  if (strcmp(argv[1], "ip") == 0)
52  family = NFPROTO_IPV4;
53  else if (strcmp(argv[1], "ip6") == 0)
54  family = NFPROTO_IPV6;
55  else if (strcmp(argv[1], "inet") == 0)
56  family = NFPROTO_INET;
57  else if (strcmp(argv[1], "bridge") == 0)
58  family = NFPROTO_BRIDGE;
59  else if (strcmp(argv[1], "arp") == 0)
60  family = NFPROTO_ARP;
61  else {
62  fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
63  exit(EXIT_FAILURE);
64  }
65 
66  t = chain_del_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  chain_seq = seq;
77  nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
78  NFT_MSG_DELCHAIN, family, NLM_F_ACK, seq++);
79  nftnl_chain_nlmsg_build_payload(nlh, t);
80  nftnl_chain_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, chain_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 }