diff --git a/src/gtp-genl.c b/src/gtp-genl.c
new file mode 100644
index 0000000..0dd5473
--- /dev/null
+++ b/src/gtp-genl.c
@@ -0,0 +1,177 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <inttypes.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/genetlink.h>
+
+#include <libgtpnl/gtpnl.h>
+
+#include <net/if.h>
+#include <linux/gtp_nl.h>
+
+#include "internal.h"
+
+static void gtp_build_payload(struct nlmsghdr *nlh, uint64_t tid,
+			      uint32_t ifidx, uint32_t sgsn_addr,
+			      uint32_t ms_addr, uint32_t version)
+{
+	mnl_attr_put_u32(nlh, GTPA_VERSION, version);
+	mnl_attr_put_u32(nlh, GTPA_LINK, ifidx);
+	mnl_attr_put_u32(nlh, GTPA_SGSN_ADDRESS, sgsn_addr);
+	mnl_attr_put_u32(nlh, GTPA_MS_ADDRESS, ms_addr);
+	mnl_attr_put_u64(nlh, GTPA_TID, tid);
+}
+
+int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, const char *ifname,
+		   const char *ms_addr, const char *sgsn_addr, uint64_t tid,
+		   int gtp_version)
+{
+	uint32_t gtp_ifidx;
+	struct in_addr ms, sgsn;
+	struct nlmsghdr *nlh;
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+	uint32_t seq = time(NULL);
+
+	gtp_ifidx = if_nametoindex(ifname);
+	if (gtp_ifidx == 0){
+		fprintf(stderr, "wrong GTP interface %s\n", ifname);
+		return -1;
+	}
+
+	if (inet_aton(ms_addr, &ms) < 0) {
+		perror("bad address for ms");
+		return -1;
+	}
+
+	if (inet_aton(sgsn_addr, &sgsn) < 0) {
+		perror("bad address for sgsn");
+		return -1;
+	}
+
+	if (gtp_version > GTP_V1) {
+		fprintf(stderr, "wrong GTP version %u, use v0 or v1\n",
+			gtp_version);
+		return -1;
+	}
+
+	nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_EXCL | NLM_F_ACK, ++seq,
+				   GTP_CMD_TUNNEL_NEW);
+	gtp_build_payload(nlh, tid, gtp_ifidx, sgsn.s_addr,
+			  ms.s_addr, gtp_version);
+
+	if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0)
+		perror("genl_socket_talk");
+
+	return 0;
+}
+EXPORT_SYMBOL(gtp_add_tunnel);
+
+int gtp_del_tunnel(int genl_id, struct mnl_socket *nl, const char *ifname,
+		   uint64_t tid, uint32_t gtp_version)
+{
+	uint32_t gtp_ifidx;
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+	struct nlmsghdr *nlh;
+	uint32_t seq = time(NULL);
+
+	gtp_ifidx = if_nametoindex(ifname);
+
+	nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_ACK, ++seq,
+				   GTP_CMD_TUNNEL_DELETE);
+	gtp_build_payload(nlh, tid, gtp_ifidx, 0, 0, gtp_version);
+
+	if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0)
+		perror("genl_socket_talk");
+
+	return 0;
+}
+EXPORT_SYMBOL(gtp_del_tunnel);
+
+struct gtp_pdp {
+	uint32_t	version;
+	uint64_t	tid;
+	struct in_addr	sgsn_addr;
+	struct in_addr	ms_addr;
+};
+
+static int genl_gtp_validate_cb(const struct nlattr *attr, void *data)
+{
+	const struct nlattr **tb = data;
+	int type = mnl_attr_get_type(attr);
+
+	if (mnl_attr_type_valid(attr, CTRL_ATTR_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case GTPA_TID:
+		if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0) {
+			perror("mnl_attr_validate");
+			return MNL_CB_ERROR;
+		}
+		break;
+	case GTPA_SGSN_ADDRESS:
+	case GTPA_MS_ADDRESS:
+	case GTPA_VERSION:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+			perror("mnl_attr_validate");
+			return MNL_CB_ERROR;
+		}
+		break;
+	default:
+		break;
+	}
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static int genl_gtp_attr_cb(const struct nlmsghdr *nlh, void *data)
+{
+	struct nlattr *tb[GTPA_MAX + 1] = {};
+	struct gtp_pdp pdp;
+	struct genlmsghdr *genl;
+
+	mnl_attr_parse(nlh, sizeof(*genl), genl_gtp_validate_cb, tb);
+	if (tb[GTPA_TID])
+		pdp.tid = mnl_attr_get_u64(tb[GTPA_TID]);
+	if (tb[GTPA_SGSN_ADDRESS]) {
+		pdp.sgsn_addr.s_addr =
+			mnl_attr_get_u32(tb[GTPA_SGSN_ADDRESS]);
+	}
+	if (tb[GTPA_MS_ADDRESS]) {
+		pdp.ms_addr.s_addr = mnl_attr_get_u32(tb[GTPA_MS_ADDRESS]);
+	}
+	if (tb[GTPA_VERSION]) {
+		pdp.version = mnl_attr_get_u32(tb[GTPA_VERSION]);
+	}
+
+	printf("version %u ", pdp.version);
+	printf("tid %"PRIu64" ms_addr %s ", pdp.tid, inet_ntoa(pdp.sgsn_addr));
+	printf("sgsn_addr %s\n", inet_ntoa(pdp.ms_addr));
+
+	return MNL_CB_OK;
+}
+
+int gtp_list_tunnel(int genl_id, struct mnl_socket *nl)
+{
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+	struct nlmsghdr *nlh;
+	uint32_t seq = time(NULL);
+
+	nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_DUMP, 0,
+				   GTP_CMD_TUNNEL_GET);
+
+	if (genl_socket_talk(nl, nlh, seq, genl_gtp_attr_cb, NULL) < 0) {
+		perror("genl_socket_talk");
+		return 0;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(gtp_list_tunnel);