1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <unistd.h>
4 #include <time.h>
5 #include <arpa/inet.h>
6
7 #include <libmnl/libmnl.h>
8 #include <libnetfilter_conntrack/libnetfilter_conntrack.h>
9
10 #include <linux/netfilter/nf_conntrack_tcp.h>
11
main(void)12 int main(void)
13 {
14 struct mnl_socket *nl;
15 struct nlmsghdr *nlh;
16 struct nfgenmsg *nfh;
17 char buf[MNL_SOCKET_BUFFER_SIZE];
18 unsigned int seq, portid;
19 int ret;
20
21 nl = mnl_socket_open(NETLINK_NETFILTER);
22 if (nl == NULL) {
23 perror("mnl_socket_open");
24 exit(EXIT_FAILURE);
25 }
26
27 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
28 perror("mnl_socket_bind");
29 exit(EXIT_FAILURE);
30 }
31 portid = mnl_socket_get_portid(nl);
32
33 nlh = mnl_nlmsg_put_header(buf);
34 nlh->nlmsg_type = (NFNL_SUBSYS_CTNETLINK << 8) | IPCTNL_MSG_CT_DELETE;
35 nlh->nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
36 nlh->nlmsg_seq = seq = time(NULL);
37
38 nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg));
39 nfh->nfgen_family = AF_INET;
40 nfh->version = NFNETLINK_V0;
41 nfh->res_id = 0;
42
43 ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len);
44 if (ret == -1) {
45 perror("mnl_socket_recvfrom");
46 exit(EXIT_FAILURE);
47 }
48
49 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
50 while (ret > 0) {
51 ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL);
52 if (ret <= MNL_CB_STOP)
53 break;
54 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
55 }
56 if (ret == -1) {
57 perror("mnl_socket_recvfrom");
58 exit(EXIT_FAILURE);
59 }
60
61 mnl_socket_close(nl);
62
63 return 0;
64 }
65