18a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <stdio.h> 28a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <stdlib.h> 38a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <unistd.h> 48a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <time.h> 58a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <arpa/inet.h> 68a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 78a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <libmnl/libmnl.h> 88a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <libnetfilter_conntrack/libnetfilter_conntrack.h> 98a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 108a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <linux/netfilter/nf_conntrack_tcp.h> 118a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 128a44513648da0c5f5551f96b329cf56b66f5b303pkanwarint main(void) 138a44513648da0c5f5551f96b329cf56b66f5b303pkanwar{ 148a44513648da0c5f5551f96b329cf56b66f5b303pkanwar struct mnl_socket *nl; 158a44513648da0c5f5551f96b329cf56b66f5b303pkanwar struct nlmsghdr *nlh; 168a44513648da0c5f5551f96b329cf56b66f5b303pkanwar struct nfgenmsg *nfh; 178a44513648da0c5f5551f96b329cf56b66f5b303pkanwar char buf[MNL_SOCKET_BUFFER_SIZE]; 188a44513648da0c5f5551f96b329cf56b66f5b303pkanwar unsigned int seq, portid; 198a44513648da0c5f5551f96b329cf56b66f5b303pkanwar int ret; 208a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 218a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nl = mnl_socket_open(NETLINK_NETFILTER); 228a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (nl == NULL) { 238a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_open"); 248a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 258a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 268a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 278a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { 288a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_bind"); 298a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 308a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 318a44513648da0c5f5551f96b329cf56b66f5b303pkanwar portid = mnl_socket_get_portid(nl); 328a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 338a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nlh = mnl_nlmsg_put_header(buf); 348a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nlh->nlmsg_type = (NFNL_SUBSYS_CTNETLINK << 8) | IPCTNL_MSG_CT_DELETE; 358a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nlh->nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK; 368a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nlh->nlmsg_seq = seq = time(NULL); 378a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 388a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg)); 398a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfh->nfgen_family = AF_INET; 408a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfh->version = NFNETLINK_V0; 418a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfh->res_id = 0; 428a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 438a44513648da0c5f5551f96b329cf56b66f5b303pkanwar ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len); 448a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (ret == -1) { 458a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_recvfrom"); 468a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 478a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 488a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 498a44513648da0c5f5551f96b329cf56b66f5b303pkanwar ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); 508a44513648da0c5f5551f96b329cf56b66f5b303pkanwar while (ret > 0) { 518a44513648da0c5f5551f96b329cf56b66f5b303pkanwar ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL); 528a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (ret <= MNL_CB_STOP) 538a44513648da0c5f5551f96b329cf56b66f5b303pkanwar break; 548a44513648da0c5f5551f96b329cf56b66f5b303pkanwar ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); 558a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 568a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (ret == -1) { 578a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_recvfrom"); 588a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 598a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 608a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 618a44513648da0c5f5551f96b329cf56b66f5b303pkanwar mnl_socket_close(nl); 628a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 638a44513648da0c5f5551f96b329cf56b66f5b303pkanwar return 0; 648a44513648da0c5f5551f96b329cf56b66f5b303pkanwar} 65