[libnftnl,v4,2/2] examples: add ct expectation examples

diff --git a/examples/Makefile.am b/examples/Makefile.am
index d044b90..db9164d 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -29,10 +29,14 @@  check_PROGRAMS = nft-table-add		\
 		 nft-flowtable-get	\
 		 nft-ruleset-get	\
 		 nft-compat-get 	\
+		 nft-ct-expectation-add \
+		 nft-ct-expectation-del \
+		 nft-ct-expectation-get \
 		 nft-ct-helper-add	\
 		 nft-ct-helper-get	\
 		 nft-ct-helper-del	\
 		 nft-rule-ct-helper-add \
+		 nft-rule-ct-expectation-add \
 		 nft-rule-ct-timeout-add
 
 nft_table_add_SOURCES = nft-table-add.c
@@ -122,6 +126,15 @@  nft_ruleset_get_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
 nft_compat_get_SOURCES = nft-compat-get.c
 nft_compat_get_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
 
+nft_ct_expectation_add_SOURCES = nft-ct-expectation-add.c
+nft_ct_expectation_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
+nft_ct_expectation_del_SOURCES = nft-ct-expectation-del.c
+nft_ct_expectation_del_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
+nft_ct_expectation_get_SOURCES = nft-ct-expectation-get.c
+nft_ct_expectation_get_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
 nft_ct_helper_add_SOURCES = nft-ct-helper-add.c
 nft_ct_helper_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
 
@@ -134,5 +147,8 @@  nft_ct_helper_del_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
 nft_rule_ct_helper_add_SOURCES = nft-rule-ct-helper-add.c
 nft_rule_ct_helper_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
 
+nft_rule_ct_expectation_add_SOURCES = nft-rule-ct-expectation-add.c
+nft_rule_ct_expectation_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
 nft_rule_ct_timeout_add_SOURCES = nft-rule-ct-timeout-add.c
 nft_rule_ct_timeout_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
diff --git a/examples/nft-ct-expectation-add.c b/examples/nft-ct-expectation-add.c
new file mode 100644
index 0000000..d9b9cdb
--- /dev/null
+++ b/examples/nft-ct-expectation-add.c
@@ -0,0 +1,153 @@ 
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <time.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <linux/netfilter.h>
+
+#include <obj.h>
+#include <libmnl/libmnl.h>
+
+static uint16_t parse_family(char *str, const char *option)
+{
+	if (strcmp(str, "ip") == 0)
+		return NFPROTO_IPV4;
+	else if (strcmp(str, "ip6") == 0)
+		return NFPROTO_IPV6;
+	else if (strcmp(str, "inet") == 0)
+		return NFPROTO_INET;
+	else if (strcmp(str, "arp") == 0)
+		return NFPROTO_INET;
+	fprintf(stderr, "Unknown %s: ip, ip6, inet, arp\n", option);
+	exit(EXIT_FAILURE);
+}
+
+static uint8_t parse_l4proto(char *str)
+{
+	if (strcmp(str, "udp") == 0)
+		return IPPROTO_UDP;
+	else if (strcmp(str, "tcp") == 0)
+		return IPPROTO_TCP;
+	else {
+		fprintf(stderr, "Unknown l4proto: tcp, udp\n");
+		exit(EXIT_FAILURE);
+	}
+	return IPPROTO_TCP;
+}
+
+static struct nftnl_obj *obj_parse(int argc, char *argv[])
+{
+	uint16_t family, l3proto, dport;
+	uint8_t l4proto, size;
+	struct nftnl_obj *t;
+	uint32_t timeout;
+
+	t = nftnl_obj_alloc();
+	if (t == NULL) {
+		perror("OOM");
+		return NULL;
+	}
+
+	family = parse_family(argv[1], "family");
+	nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
+	nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_EXPECT);
+	nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
+	nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
+
+	if (argc > 8) {
+		l3proto = parse_family(argv[8], "l3proto");
+		nftnl_obj_set_u16(t, NFTNL_OBJ_CT_EXPECT_L3PROTO, l3proto);
+	}
+	l4proto = parse_l4proto(argv[4]);
+	nftnl_obj_set_u8(t, NFTNL_OBJ_CT_EXPECT_L4PROTO, l4proto);
+	dport = atoi(argv[5]);
+	nftnl_obj_set_u16(t, NFTNL_OBJ_CT_EXPECT_DPORT, dport);
+	timeout = atol(argv[6]);
+	nftnl_obj_set_u32(t, NFTNL_OBJ_CT_EXPECT_TIMEOUT, timeout);
+	size = atoi(argv[7]);
+	nftnl_obj_set_u8(t, NFTNL_OBJ_CT_EXPECT_SIZE, size);
+
+	return t;
+}
+
+int main(int argc, char *argv[])
+{
+	uint32_t portid, seq, obj_seq, family;
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+	struct mnl_nlmsg_batch *batch;
+	struct mnl_socket *nl;
+	struct nlmsghdr *nlh;
+	struct nftnl_obj *t;
+	int ret;
+
+	if (argc < 8 || argc > 9) {
+		fprintf(stderr, "%s <family> <table> <name> <l4proto> <dport> <timeout> <size> [l3proto]\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	t = obj_parse(argc, argv);
+	if (t == NULL) {
+		exit(EXIT_FAILURE);
+	}
+
+	seq = time(NULL);
+	batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+	nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
+	mnl_nlmsg_batch_next(batch);
+
+	obj_seq = seq;
+	family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
+	nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+				    NFT_MSG_NEWOBJ, family,
+				    NLM_F_ACK | NLM_F_CREATE, seq++);
+	nftnl_obj_nlmsg_build_payload(nlh, t);
+	nftnl_obj_free(t);
+	mnl_nlmsg_batch_next(batch);
+
+	nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
+	mnl_nlmsg_batch_next(batch);
+
+	nl = mnl_socket_open(NETLINK_NETFILTER);
+	if (nl == NULL) {
+		perror("mnl_socket_open");
+		exit(EXIT_FAILURE);
+	}
+
+	if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+		perror("mnl_socket_bind");
+		exit(EXIT_FAILURE);
+	}
+	portid = mnl_socket_get_portid(nl);
+
+	if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
+			      mnl_nlmsg_batch_size(batch)) < 0) {
+		perror("mnl_socket_send");
+		exit(EXIT_FAILURE);
+	}
+
+	mnl_nlmsg_batch_stop(batch);
+
+	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	while (ret > 0) {
+		ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
+		if (ret <= 0)
+			break;
+		ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	}
+	if (ret == -1) {
+		perror("error");
+		exit(EXIT_FAILURE);
+	}
+	mnl_socket_close(nl);
+
+	return EXIT_SUCCESS;
+}
diff --git a/examples/nft-ct-expectation-del.c b/examples/nft-ct-expectation-del.c
new file mode 100644
index 0000000..67dbd47
--- /dev/null
+++ b/examples/nft-ct-expectation-del.c
@@ -0,0 +1,126 @@ 
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/object.h>
+
+static uint16_t parse_family(char *str, const char *option)
+{
+	if (strcmp(str, "ip") == 0)
+		return NFPROTO_IPV4;
+	else if (strcmp(str, "ip6") == 0)
+		return NFPROTO_IPV6;
+	else if (strcmp(str, "inet") == 0)
+		return NFPROTO_INET;
+	else if (strcmp(str, "arp") == 0)
+		return NFPROTO_INET;
+	fprintf(stderr, "Unknown %s: ip, ip6, inet, arp\n", option);
+	exit(EXIT_FAILURE);
+}
+
+static struct nftnl_obj *obj_parse(int argc, char *argv[])
+{
+	struct nftnl_obj *t;
+	uint16_t family;
+
+	t = nftnl_obj_alloc();
+	if (t == NULL) {
+		perror("OOM");
+		return NULL;
+	}
+
+	family = parse_family(argv[1], "family");
+	nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
+	nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_EXPECT);
+	nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
+	nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
+
+	return t;
+}
+
+int main(int argc, char *argv[])
+{
+	struct mnl_socket *nl;
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+	struct nlmsghdr *nlh;
+	uint32_t portid, seq, obj_seq, family;
+	struct nftnl_obj *t;
+	struct mnl_nlmsg_batch *batch;
+	int ret;
+
+	if (argc != 4) {
+		fprintf(stderr, "%s <family> <table> <name>\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	t = obj_parse(argc, argv);
+	if (t == NULL)
+		exit(EXIT_FAILURE);
+
+	seq = time(NULL);
+	batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+	nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
+	mnl_nlmsg_batch_next(batch);
+
+	obj_seq = seq;
+	family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
+	nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+				    NFT_MSG_DELOBJ, family, NLM_F_ACK,
+				    seq++);
+	nftnl_obj_nlmsg_build_payload(nlh, t);
+	mnl_nlmsg_batch_next(batch);
+	nftnl_obj_free(t);
+
+	nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
+	mnl_nlmsg_batch_next(batch);
+
+	nl = mnl_socket_open(NETLINK_NETFILTER);
+	if (nl == NULL) {
+		perror("mnl_socket_open");
+		exit(EXIT_FAILURE);
+	}
+
+	if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+		perror("mnl_socket_bind");
+		exit(EXIT_FAILURE);
+	}
+	portid = mnl_socket_get_portid(nl);
+
+	if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
+			      mnl_nlmsg_batch_size(batch)) < 0) {
+		perror("mnl_socket_send");
+		exit(EXIT_FAILURE);
+	}
+
+	mnl_nlmsg_batch_stop(batch);
+
+	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	while (ret > 0) {
+		ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
+		if (ret <= 0)
+			break;
+		ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	}
+	if (ret == -1) {
+		perror("error");
+		exit(EXIT_FAILURE);
+	}
+	mnl_socket_close(nl);
+
+	return EXIT_SUCCESS;
+}
diff --git a/examples/nft-ct-expectation-get.c b/examples/nft-ct-expectation-get.c
new file mode 100644
index 0000000..12c1350
--- /dev/null
+++ b/examples/nft-ct-expectation-get.c
@@ -0,0 +1,142 @@ 
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/object.h>
+
+static uint16_t parse_family(char *str, const char *option)
+{
+	if (strcmp(str, "ip") == 0)
+		return NFPROTO_IPV4;
+	else if (strcmp(str, "ip6") == 0)
+		return NFPROTO_IPV6;
+	else if (strcmp(str, "inet") == 0)
+		return NFPROTO_INET;
+	else if (strcmp(str, "arp") == 0)
+		return NFPROTO_INET;
+	fprintf(stderr, "Unknown %s: ip, ip6, inet, arp\n", option);
+	exit(EXIT_FAILURE);
+}
+
+static struct nftnl_obj *obj_parse(int argc, char *argv[])
+{
+	struct nftnl_obj *t;
+	uint16_t family;
+
+	t = nftnl_obj_alloc();
+	if (t == NULL) {
+		perror("OOM");
+		return NULL;
+	}
+
+	family = parse_family(argv[1], "family");
+	nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
+	nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_EXPECT);
+	nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
+
+	if (argc > 3)
+		nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
+
+	return t;
+}
+
+static int obj_cb(const struct nlmsghdr *nlh, void *data)
+{
+	uint32_t *type = data;
+	struct nftnl_obj *t;
+	char buf[4096];
+
+	t = nftnl_obj_alloc();
+	if (t == NULL) {
+		perror("OOM");
+		goto err;
+	}
+
+	if (nftnl_obj_nlmsg_parse(nlh, t) < 0) {
+		perror("nftnl_obj_nlmsg_parse");
+		goto err_free;
+	}
+
+	nftnl_obj_snprintf(buf, sizeof(buf), t, *type, 0);
+	printf("%s\n", buf);
+
+err_free:
+	nftnl_obj_free(t);
+err:
+	return MNL_CB_OK;
+}
+
+int main(int argc, char *argv[])
+{
+	struct mnl_socket *nl;
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+	struct nlmsghdr *nlh;
+	uint32_t portid, seq, family;
+	struct nftnl_obj *t;
+	int ret;
+	uint32_t type = NFTNL_OUTPUT_DEFAULT;
+	uint16_t flags = NLM_F_ACK;
+
+	if (argc < 3 || argc > 4) {
+		fprintf(stderr, "%s <family> <table> [<name>]\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	t = obj_parse(argc, argv);
+	if (t == NULL)
+		exit(EXIT_FAILURE);
+	family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
+
+	seq = time(NULL);
+	if (argc < 4)
+		flags = NLM_F_DUMP;
+	nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETOBJ, family, flags, seq);
+	nftnl_obj_nlmsg_build_payload(nlh, t);
+	nftnl_obj_free(t);
+
+	nl = mnl_socket_open(NETLINK_NETFILTER);
+	if (nl == NULL) {
+		perror("mnl_socket_open");
+		exit(EXIT_FAILURE);
+	}
+
+	if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+		perror("mnl_socket_bind");
+		exit(EXIT_FAILURE);
+	}
+	portid = mnl_socket_get_portid(nl);
+
+	if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+		perror("mnl_socket_send");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	while (ret > 0) {
+		ret = mnl_cb_run(buf, ret, seq, portid, obj_cb, &type);
+		if (ret <= 0)
+			break;
+		ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	}
+	if (ret == -1) {
+		perror("error");
+		exit(EXIT_FAILURE);
+	}
+	mnl_socket_close(nl);
+
+	return EXIT_SUCCESS;
+}
diff --git a/examples/nft-rule-ct-expectation-add.c b/examples/nft-rule-ct-expectation-add.c
new file mode 100644
index 0000000..238e224
--- /dev/null
+++ b/examples/nft-rule-ct-expectation-add.c
@@ -0,0 +1,163 @@ 
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <stddef.h>	/* for offsetof */
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <errno.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/rule.h>
+#include <libnftnl/expr.h>
+
+static uint16_t parse_family(char *str, const char *option)
+{
+	if (strcmp(str, "ip") == 0)
+		return NFPROTO_IPV4;
+	else if (strcmp(str, "ip6") == 0)
+		return NFPROTO_IPV6;
+	else if (strcmp(str, "inet") == 0)
+		return NFPROTO_INET;
+	else if (strcmp(str, "arp") == 0)
+		return NFPROTO_INET;
+	fprintf(stderr, "Unknown %s: ip, ip6, inet, arp\n", option);
+	exit(EXIT_FAILURE);
+}
+
+static void add_ct_expect(struct nftnl_rule *r, const char *obj_name)
+{
+	struct nftnl_expr *e;
+
+	e = nftnl_expr_alloc("objref");
+	if (e == NULL) {
+		perror("expr objref oom");
+		exit(EXIT_FAILURE);
+	}
+	nftnl_expr_set_str(e, NFTNL_EXPR_OBJREF_IMM_NAME, obj_name);
+	nftnl_expr_set_u32(e, NFTNL_EXPR_OBJREF_IMM_TYPE, NFT_OBJECT_CT_EXPECT);
+
+	nftnl_rule_add_expr(r, e);
+}
+
+static struct nftnl_rule *setup_rule(uint8_t family, const char *table,
+				     const char *chain, const char *handle,
+				     const char *obj_name)
+{
+	struct nftnl_rule *r = NULL;
+	uint64_t handle_num;
+
+	r = nftnl_rule_alloc();
+	if (r == NULL) {
+		perror("OOM");
+		exit(EXIT_FAILURE);
+	}
+
+	nftnl_rule_set(r, NFTNL_RULE_TABLE, table);
+	nftnl_rule_set(r, NFTNL_RULE_CHAIN, chain);
+	nftnl_rule_set_u32(r, NFTNL_RULE_FAMILY, family);
+
+	if (handle != NULL) {
+		handle_num = atoll(handle);
+		nftnl_rule_set_u64(r, NFTNL_RULE_POSITION, handle_num);
+	}
+
+	add_ct_expect(r, obj_name);
+
+	return r;
+}
+
+int main(int argc, char *argv[])
+{
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+	struct mnl_nlmsg_batch *batch;
+	uint32_t seq = time(NULL);
+	struct mnl_socket *nl;
+	struct nftnl_rule *r;
+	struct nlmsghdr *nlh;
+	uint8_t family;
+	int ret;
+
+	if (argc < 5 || argc > 6) {
+		fprintf(stderr,
+			"Usage: %s <family> <table> <chain> [<handle>] <name>\n",
+			argv[0]);
+		exit(EXIT_FAILURE);
+	}
+	family = parse_family(argv[1], "family");
+
+	if (argc < 6)
+		r = setup_rule(family, argv[2], argv[3], NULL, argv[4]);
+	else
+		r = setup_rule(family, argv[2], argv[3], argv[4], argv[5]);
+
+	nl = mnl_socket_open(NETLINK_NETFILTER);
+	if (nl == NULL) {
+		perror("mnl_socket_open");
+		exit(EXIT_FAILURE);
+	}
+
+	if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+		perror("mnl_socket_bind");
+		exit(EXIT_FAILURE);
+	}
+
+	batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+	nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
+	mnl_nlmsg_batch_next(batch);
+
+	nlh = nftnl_rule_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+					 NFT_MSG_NEWRULE,
+					 nftnl_rule_get_u32(r, NFTNL_RULE_FAMILY),
+					 NLM_F_APPEND|NLM_F_CREATE|NLM_F_ACK,
+					 seq++);
+
+	nftnl_rule_nlmsg_build_payload(nlh, r);
+	nftnl_rule_free(r);
+	mnl_nlmsg_batch_next(batch);
+
+	nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
+	mnl_nlmsg_batch_next(batch);
+
+	ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
+				mnl_nlmsg_batch_size(batch));
+	if (ret == -1) {
+		perror("mnl_socket_sendto");
+		exit(EXIT_FAILURE);
+	}
+
+	mnl_nlmsg_batch_stop(batch);
+
+	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	if (ret == -1) {
+		perror("mnl_socket_recvfrom");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
+	if (ret < 0) {
+		perror("mnl_cb_run");
+		exit(EXIT_FAILURE);
+	}
+
+	mnl_socket_close(nl);
+
+	return EXIT_SUCCESS;
+}