libnftnl 1.2.6
nft-chain-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/chain.h>
22
23static struct nftnl_chain *chain_del_parse(int argc, char *argv[])
24{
25 struct nftnl_chain *t;
26
27 t = nftnl_chain_alloc();
28 if (t == NULL) {
29 perror("OOM");
30 return NULL;
31 }
32
33 nftnl_chain_set_str(t, NFTNL_CHAIN_TABLE, argv[2]);
34 nftnl_chain_set_str(t, NFTNL_CHAIN_NAME, argv[3]);
35
36 return t;
37}
38
39int main(int argc, char *argv[])
40{
41 struct mnl_socket *nl;
42 struct mnl_nlmsg_batch *batch;
43 char buf[MNL_SOCKET_BUFFER_SIZE];
44 struct nlmsghdr *nlh;
45 uint32_t portid, seq, chain_seq;
46 struct nftnl_chain *t;
47 int ret, family;
48
49 if (argc != 4) {
50 fprintf(stderr, "Usage: %s <family> <table> <chain>\n",
51 argv[0]);
52 exit(EXIT_FAILURE);
53 }
54
55 if (strcmp(argv[1], "ip") == 0)
56 family = NFPROTO_IPV4;
57 else if (strcmp(argv[1], "ip6") == 0)
58 family = NFPROTO_IPV6;
59 else if (strcmp(argv[1], "inet") == 0)
60 family = NFPROTO_INET;
61 else if (strcmp(argv[1], "bridge") == 0)
62 family = NFPROTO_BRIDGE;
63 else if (strcmp(argv[1], "arp") == 0)
64 family = NFPROTO_ARP;
65 else {
66 fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
67 exit(EXIT_FAILURE);
68 }
69
70 t = chain_del_parse(argc, argv);
71 if (t == NULL)
72 exit(EXIT_FAILURE);
73
74 seq = time(NULL);
75 batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
76
77 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
78 mnl_nlmsg_batch_next(batch);
79
80 chain_seq = seq;
81 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
82 NFT_MSG_DELCHAIN, family, NLM_F_ACK, seq++);
83 nftnl_chain_nlmsg_build_payload(nlh, t);
84 nftnl_chain_free(t);
85 mnl_nlmsg_batch_next(batch);
86
87 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
88 mnl_nlmsg_batch_next(batch);
89
90 nl = mnl_socket_open(NETLINK_NETFILTER);
91 if (nl == NULL) {
92 perror("mnl_socket_open");
93 exit(EXIT_FAILURE);
94 }
95
96 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
97 perror("mnl_socket_bind");
98 exit(EXIT_FAILURE);
99 }
100 portid = mnl_socket_get_portid(nl);
101
102 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
103 mnl_nlmsg_batch_size(batch)) < 0) {
104 perror("mnl_socket_send");
105 exit(EXIT_FAILURE);
106 }
107
108 mnl_nlmsg_batch_stop(batch);
109
110 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
111 while (ret > 0) {
112 ret = mnl_cb_run(buf, ret, chain_seq, portid, NULL, NULL);
113 if (ret <= 0)
114 break;
115 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
116 }
117 if (ret == -1) {
118 perror("error");
119 exit(EXIT_FAILURE);
120 }
121 mnl_socket_close(nl);
122
123 return EXIT_SUCCESS;
124}