Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:
 "Highlights:

   1) Maintain the TCP retransmit queue using an rbtree, with 1GB
      windows at 100Gb this really has become necessary. From Eric
      Dumazet.

   2) Multi-program support for cgroup+bpf, from Alexei Starovoitov.

   3) Perform broadcast flooding in hardware in mv88e6xxx, from Andrew
      Lunn.

   4) Add meter action support to openvswitch, from Andy Zhou.

   5) Add a data meta pointer for BPF accessible packets, from Daniel
      Borkmann.

   6) Namespace-ify almost all TCP sysctl knobs, from Eric Dumazet.

   7) Turn on Broadcom Tags in b53 driver, from Florian Fainelli.

   8) More work to move the RTNL mutex down, from Florian Westphal.

   9) Add 'bpftool' utility, to help with bpf program introspection.
      From Jakub Kicinski.

  10) Add new 'cpumap' type for XDP_REDIRECT action, from Jesper
      Dangaard Brouer.

  11) Support 'blocks' of transformations in the packet scheduler which
      can span multiple network devices, from Jiri Pirko.

  12) TC flower offload support in cxgb4, from Kumar Sanghvi.

  13) Priority based stream scheduler for SCTP, from Marcelo Ricardo
      Leitner.

  14) Thunderbolt networking driver, from Amir Levy and Mika Westerberg.

  15) Add RED qdisc offloadability, and use it in mlxsw driver. From
      Nogah Frankel.

  16) eBPF based device controller for cgroup v2, from Roman Gushchin.

  17) Add some fundamental tracepoints for TCP, from Song Liu.

  18) Remove garbage collection from ipv6 route layer, this is a
      significant accomplishment. From Wei Wang.

  19) Add multicast route offload support to mlxsw, from Yotam Gigi"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (2177 commits)
  tcp: highest_sack fix
  geneve: fix fill_info when link down
  bpf: fix lockdep splat
  net: cdc_ncm: GetNtbFormat endian fix
  openvswitch: meter: fix NULL pointer dereference in ovs_meter_cmd_reply_start
  netem: remove unnecessary 64 bit modulus
  netem: use 64 bit divide by rate
  tcp: Namespace-ify sysctl_tcp_default_congestion_control
  net: Protect iterations over net::fib_notifier_ops in fib_seq_sum()
  ipv6: set all.accept_dad to 0 by default
  uapi: fix linux/tls.h userspace compilation error
  usbnet: ipheth: prevent TX queue timeouts when device not ready
  vhost_net: conditionally enable tx polling
  uapi: fix linux/rxrpc.h userspace compilation errors
  net: stmmac: fix LPI transitioning for dwmac4
  atm: horizon: Fix irq release error
  net-sysfs: trigger netlink notification on ifalias change via sysfs
  openvswitch: Using kfree_rcu() to simplify the code
  openvswitch: Make local function ovs_nsh_key_attr_size() static
  openvswitch: Fix return value check in ovs_meter_cmd_features()
  ...

1 files changed, 660 insertions, 0 deletions

diff --git a/samples/bpf/xdp_router_ipv4_user.c b/samples/bpf/xdp_router_ipv4_user.c
new file mode 100644
index 000000000000..916462112d55
--- /dev/null
+++ b/samples/bpf/xdp_router_ipv4_user.c
@@ -0,0 +1,660 @@
+/* Copyright (C) 2017 Cavium, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ */
+#include <linux/bpf.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <assert.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include "bpf_load.h"
+#include "libbpf.h"
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <net/if.h>
+#include <netdb.h>
+#include <sys/ioctl.h>
+#include <sys/syscall.h>
+#include "bpf_util.h"
+
+int sock, sock_arp, flags = 0;
+static int total_ifindex;
+int *ifindex_list;
+char buf[8192];
+
+static int get_route_table(int rtm_family);
+static void int_exit(int sig)
+{
+	int i = 0;
+
+	for (i = 0; i < total_ifindex; i++)
+		set_link_xdp_fd(ifindex_list[i], -1, flags);
+	exit(0);
+}
+
+static void close_and_exit(int sig)
+{
+	int i = 0;
+
+	close(sock);
+	close(sock_arp);
+
+	for (i = 0; i < total_ifindex; i++)
+		set_link_xdp_fd(ifindex_list[i], -1, flags);
+	exit(0);
+}
+
+/* Get the mac address of the interface given interface name */
+static __be64 getmac(char *iface)
+{
+	struct ifreq ifr;
+	__be64 mac = 0;
+	int fd, i;
+
+	fd = socket(AF_INET, SOCK_DGRAM, 0);
+	ifr.ifr_addr.sa_family = AF_INET;
+	strncpy(ifr.ifr_name, iface, IFNAMSIZ - 1);
+	if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
+		printf("ioctl failed leaving....\n");
+		return -1;
+	}
+	for (i = 0; i < 6 ; i++)
+		*((__u8 *)&mac + i) = (__u8)ifr.ifr_hwaddr.sa_data[i];
+	close(fd);
+	return mac;
+}
+
+static int recv_msg(struct sockaddr_nl sock_addr, int sock)
+{
+	struct nlmsghdr *nh;
+	int len, nll = 0;
+	char *buf_ptr;
+
+	buf_ptr = buf;
+	while (1) {
+		len = recv(sock, buf_ptr, sizeof(buf) - nll, 0);
+		if (len < 0)
+			return len;
+
+		nh = (struct nlmsghdr *)buf_ptr;
+
+		if (nh->nlmsg_type == NLMSG_DONE)
+			break;
+		buf_ptr += len;
+		nll += len;
+		if ((sock_addr.nl_groups & RTMGRP_NEIGH) == RTMGRP_NEIGH)
+			break;
+
+		if ((sock_addr.nl_groups & RTMGRP_IPV4_ROUTE) == RTMGRP_IPV4_ROUTE)
+			break;
+	}
+	return nll;
+}
+
+/* Function to parse the route entry returned by netlink
+ * Updates the route entry related map entries
+ */
+static void read_route(struct nlmsghdr *nh, int nll)
+{
+	char dsts[24], gws[24], ifs[16], dsts_len[24], metrics[24];
+	struct bpf_lpm_trie_key *prefix_key;
+	struct rtattr *rt_attr;
+	struct rtmsg *rt_msg;
+	int rtm_family;
+	int rtl;
+	int i;
+	struct route_table {
+		int  dst_len, iface, metric;
+		char *iface_name;
+		__be32 dst, gw;
+		__be64 mac;
+	} route;
+	struct arp_table {
+		__be64 mac;
+		__be32 dst;
+	};
+
+	struct direct_map {
+		struct arp_table arp;
+		int ifindex;
+		__be64 mac;
+	} direct_entry;
+
+	if (nh->nlmsg_type == RTM_DELROUTE)
+		printf("DELETING Route entry\n");
+	else if (nh->nlmsg_type == RTM_GETROUTE)
+		printf("READING Route entry\n");
+	else if (nh->nlmsg_type == RTM_NEWROUTE)
+		printf("NEW Route entry\n");
+	else
+		printf("%d\n", nh->nlmsg_type);
+
+	memset(&route, 0, sizeof(route));
+	printf("Destination\t\tGateway\t\tGenmask\t\tMetric\t\tIface\n");
+	for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
+		rt_msg = (struct rtmsg *)NLMSG_DATA(nh);
+		rtm_family = rt_msg->rtm_family;
+		if (rtm_family == AF_INET)
+			if (rt_msg->rtm_table != RT_TABLE_MAIN)
+				continue;
+		rt_attr = (struct rtattr *)RTM_RTA(rt_msg);
+		rtl = RTM_PAYLOAD(nh);
+
+		for (; RTA_OK(rt_attr, rtl); rt_attr = RTA_NEXT(rt_attr, rtl)) {
+			switch (rt_attr->rta_type) {
+			case NDA_DST:
+				sprintf(dsts, "%u",
+					(*((__be32 *)RTA_DATA(rt_attr))));
+				break;
+			case RTA_GATEWAY:
+				sprintf(gws, "%u",
+					*((__be32 *)RTA_DATA(rt_attr)));
+				break;
+			case RTA_OIF:
+				sprintf(ifs, "%u",
+					*((int *)RTA_DATA(rt_attr)));
+				break;
+			case RTA_METRICS:
+				sprintf(metrics, "%u",
+					*((int *)RTA_DATA(rt_attr)));
+			default:
+				break;
+			}
+		}
+		sprintf(dsts_len, "%d", rt_msg->rtm_dst_len);
+		route.dst = atoi(dsts);
+		route.dst_len = atoi(dsts_len);
+		route.gw = atoi(gws);
+		route.iface = atoi(ifs);
+		route.metric = atoi(metrics);
+		route.iface_name = alloca(sizeof(char *) * IFNAMSIZ);
+		route.iface_name = if_indextoname(route.iface, route.iface_name);
+		route.mac = getmac(route.iface_name);
+		if (route.mac == -1) {
+			int i = 0;
+
+			for (i = 0; i < total_ifindex; i++)
+				set_link_xdp_fd(ifindex_list[i], -1, flags);
+			exit(0);
+		}
+		assert(bpf_map_update_elem(map_fd[4], &route.iface, &route.iface, 0) == 0);
+		if (rtm_family == AF_INET) {
+			struct trie_value {
+				__u8 prefix[4];
+				__be64 value;
+				int ifindex;
+				int metric;
+				__be32 gw;
+			} *prefix_value;
+
+			prefix_key = alloca(sizeof(*prefix_key) + 3);
+			prefix_value = alloca(sizeof(*prefix_value));
+
+			prefix_key->prefixlen = 32;
+			prefix_key->prefixlen = route.dst_len;
+			direct_entry.mac = route.mac & 0xffffffffffff;
+			direct_entry.ifindex = route.iface;
+			direct_entry.arp.mac = 0;
+			direct_entry.arp.dst = 0;
+			if (route.dst_len == 32) {
+				if (nh->nlmsg_type == RTM_DELROUTE) {
+					assert(bpf_map_delete_elem(map_fd[3], &route.dst) == 0);
+				} else {
+					if (bpf_map_lookup_elem(map_fd[2], &route.dst, &direct_entry.arp.mac) == 0)
+						direct_entry.arp.dst = route.dst;
+					assert(bpf_map_update_elem(map_fd[3], &route.dst, &direct_entry, 0) == 0);
+				}
+			}
+			for (i = 0; i < 4; i++)
+				prefix_key->data[i] = (route.dst >> i * 8) & 0xff;
+
+			printf("%3d.%d.%d.%d\t\t%3x\t\t%d\t\t%d\t\t%s\n",
+			       (int)prefix_key->data[0],
+			       (int)prefix_key->data[1],
+			       (int)prefix_key->data[2],
+			       (int)prefix_key->data[3],
+			       route.gw, route.dst_len,
+			       route.metric,
+			       route.iface_name);
+			if (bpf_map_lookup_elem(map_fd[0], prefix_key,
+						prefix_value) < 0) {
+				for (i = 0; i < 4; i++)
+					prefix_value->prefix[i] = prefix_key->data[i];
+				prefix_value->value = route.mac & 0xffffffffffff;
+				prefix_value->ifindex = route.iface;
+				prefix_value->gw = route.gw;
+				prefix_value->metric = route.metric;
+
+				assert(bpf_map_update_elem(map_fd[0],
+							   prefix_key,
+							   prefix_value, 0
+							   ) == 0);
+			} else {
+				if (nh->nlmsg_type == RTM_DELROUTE) {
+					printf("deleting entry\n");
+					printf("prefix key=%d.%d.%d.%d/%d",
+					       prefix_key->data[0],
+					       prefix_key->data[1],
+					       prefix_key->data[2],
+					       prefix_key->data[3],
+					       prefix_key->prefixlen);
+					assert(bpf_map_delete_elem(map_fd[0],
+								   prefix_key
+								   ) == 0);
+					/* Rereading the route table to check if
+					 * there is an entry with the same
+					 * prefix but a different metric as the
+					 * deleted enty.
+					 */
+					get_route_table(AF_INET);
+				} else if (prefix_key->data[0] ==
+					   prefix_value->prefix[0] &&
+					   prefix_key->data[1] ==
+					   prefix_value->prefix[1] &&
+					   prefix_key->data[2] ==
+					   prefix_value->prefix[2] &&
+					   prefix_key->data[3] ==
+					   prefix_value->prefix[3] &&
+					   route.metric >= prefix_value->metric) {
+					continue;
+				} else {
+					for (i = 0; i < 4; i++)
+						prefix_value->prefix[i] =
+							prefix_key->data[i];
+					prefix_value->value =
+						route.mac & 0xffffffffffff;
+					prefix_value->ifindex = route.iface;
+					prefix_value->gw = route.gw;
+					prefix_value->metric = route.metric;
+					assert(bpf_map_update_elem(
+								   map_fd[0],
+								   prefix_key,
+								   prefix_value,
+								   0) == 0);
+				}
+			}
+		}
+		memset(&route, 0, sizeof(route));
+		memset(dsts, 0, sizeof(dsts));
+		memset(dsts_len, 0, sizeof(dsts_len));
+		memset(gws, 0, sizeof(gws));
+		memset(ifs, 0, sizeof(ifs));
+		memset(&route, 0, sizeof(route));
+	}
+}
+
+/* Function to read the existing route table  when the process is launched*/
+static int get_route_table(int rtm_family)
+{
+	struct sockaddr_nl sa;
+	struct nlmsghdr *nh;
+	int sock, seq = 0;
+	struct msghdr msg;
+	struct iovec iov;
+	int ret = 0;
+	int nll;
+
+	struct {
+		struct nlmsghdr nl;
+		struct rtmsg rt;
+		char buf[8192];
+	} req;
+
+	sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+	if (sock < 0) {
+		printf("open netlink socket: %s\n", strerror(errno));
+		return -1;
+	}
+	memset(&sa, 0, sizeof(sa));
+	sa.nl_family = AF_NETLINK;
+	if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
+		printf("bind to netlink: %s\n", strerror(errno));
+		ret = -1;
+		goto cleanup;
+	}
+	memset(&req, 0, sizeof(req));
+	req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
+	req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
+	req.nl.nlmsg_type = RTM_GETROUTE;
+
+	req.rt.rtm_family = rtm_family;
+	req.rt.rtm_table = RT_TABLE_MAIN;
+	req.nl.nlmsg_pid = 0;
+	req.nl.nlmsg_seq = ++seq;
+	memset(&msg, 0, sizeof(msg));
+	iov.iov_base = (void *)&req.nl;
+	iov.iov_len = req.nl.nlmsg_len;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+	ret = sendmsg(sock, &msg, 0);
+	if (ret < 0) {
+		printf("send to netlink: %s\n", strerror(errno));
+		ret = -1;
+		goto cleanup;
+	}
+	memset(buf, 0, sizeof(buf));
+	nll = recv_msg(sa, sock);
+	if (nll < 0) {
+		printf("recv from netlink: %s\n", strerror(nll));
+		ret = -1;
+		goto cleanup;
+	}
+	nh = (struct nlmsghdr *)buf;
+	read_route(nh, nll);
+cleanup:
+	close(sock);
+	return ret;
+}
+
+/* Function to parse the arp entry returned by netlink
+ * Updates the arp entry related map entries
+ */
+static void read_arp(struct nlmsghdr *nh, int nll)
+{
+	struct rtattr *rt_attr;
+	char dsts[24], mac[24];
+	struct ndmsg *rt_msg;
+	int rtl, ndm_family;
+
+	struct arp_table {
+		__be64 mac;
+		__be32 dst;
+	} arp_entry;
+	struct direct_map {
+		struct arp_table arp;
+		int ifindex;
+		__be64 mac;
+	} direct_entry;
+
+	if (nh->nlmsg_type == RTM_GETNEIGH)
+		printf("READING arp entry\n");
+	printf("Address\tHwAddress\n");
+	for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
+		rt_msg = (struct ndmsg *)NLMSG_DATA(nh);
+		rt_attr = (struct rtattr *)RTM_RTA(rt_msg);
+		ndm_family = rt_msg->ndm_family;
+		rtl = RTM_PAYLOAD(nh);
+		for (; RTA_OK(rt_attr, rtl); rt_attr = RTA_NEXT(rt_attr, rtl)) {
+			switch (rt_attr->rta_type) {
+			case NDA_DST:
+				sprintf(dsts, "%u",
+					*((__be32 *)RTA_DATA(rt_attr)));
+				break;
+			case NDA_LLADDR:
+				sprintf(mac, "%lld",
+					*((__be64 *)RTA_DATA(rt_attr)));
+				break;
+			default:
+				break;
+			}
+		}
+		arp_entry.dst = atoi(dsts);
+		arp_entry.mac = atol(mac);
+		printf("%x\t\t%llx\n", arp_entry.dst, arp_entry.mac);
+		if (ndm_family == AF_INET) {
+			if (bpf_map_lookup_elem(map_fd[3], &arp_entry.dst,
+						&direct_entry) == 0) {
+				if (nh->nlmsg_type == RTM_DELNEIGH) {
+					direct_entry.arp.dst = 0;
+					direct_entry.arp.mac = 0;
+				} else if (nh->nlmsg_type == RTM_NEWNEIGH) {
+					direct_entry.arp.dst = arp_entry.dst;
+					direct_entry.arp.mac = arp_entry.mac;
+				}
+				assert(bpf_map_update_elem(map_fd[3],
+							   &arp_entry.dst,
+							   &direct_entry, 0
+							   ) == 0);
+				memset(&direct_entry, 0, sizeof(direct_entry));
+			}
+			if (nh->nlmsg_type == RTM_DELNEIGH) {
+				assert(bpf_map_delete_elem(map_fd[2], &arp_entry.dst) == 0);
+			} else if (nh->nlmsg_type == RTM_NEWNEIGH) {
+				assert(bpf_map_update_elem(map_fd[2],
+							   &arp_entry.dst,
+							   &arp_entry.mac, 0
+							   ) == 0);
+			}
+		}
+		memset(&arp_entry, 0, sizeof(arp_entry));
+		memset(dsts, 0, sizeof(dsts));
+	}
+}
+
+/* Function to read the existing arp table  when the process is launched*/
+static int get_arp_table(int rtm_family)
+{
+	struct sockaddr_nl sa;
+	struct nlmsghdr *nh;
+	int sock, seq = 0;
+	struct msghdr msg;
+	struct iovec iov;
+	int ret = 0;
+	int nll;
+	struct {
+		struct nlmsghdr nl;
+		struct ndmsg rt;
+		char buf[8192];
+	} req;
+
+	sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+	if (sock < 0) {
+		printf("open netlink socket: %s\n", strerror(errno));
+		return -1;
+	}
+	memset(&sa, 0, sizeof(sa));
+	sa.nl_family = AF_NETLINK;
+	if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
+		printf("bind to netlink: %s\n", strerror(errno));
+		ret = -1;
+		goto cleanup;
+	}
+	memset(&req, 0, sizeof(req));
+	req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
+	req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
+	req.nl.nlmsg_type = RTM_GETNEIGH;
+	req.rt.ndm_state = NUD_REACHABLE;
+	req.rt.ndm_family = rtm_family;
+	req.nl.nlmsg_pid = 0;
+	req.nl.nlmsg_seq = ++seq;
+	memset(&msg, 0, sizeof(msg));
+	iov.iov_base = (void *)&req.nl;
+	iov.iov_len = req.nl.nlmsg_len;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+	ret = sendmsg(sock, &msg, 0);
+	if (ret < 0) {
+		printf("send to netlink: %s\n", strerror(errno));
+		ret = -1;
+		goto cleanup;
+	}
+	memset(buf, 0, sizeof(buf));
+	nll = recv_msg(sa, sock);
+	if (nll < 0) {
+		printf("recv from netlink: %s\n", strerror(nll));
+		ret = -1;
+		goto cleanup;
+	}
+	nh = (struct nlmsghdr *)buf;
+	read_arp(nh, nll);
+cleanup:
+	close(sock);
+	return ret;
+}
+
+/* Function to keep track and update changes in route and arp table
+ * Give regular statistics of packets forwarded
+ */
+static int monitor_route(void)
+{
+	unsigned int nr_cpus = bpf_num_possible_cpus();
+	const unsigned int nr_keys = 256;
+	struct pollfd fds_route, fds_arp;
+	__u64 prev[nr_keys][nr_cpus];
+	struct sockaddr_nl la, lr;
+	__u64 values[nr_cpus];
+	struct nlmsghdr *nh;
+	int nll, ret = 0;
+	int interval = 5;
+	__u32 key;
+	int i;
+
+	sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+	if (sock < 0) {
+		printf("open netlink socket: %s\n", strerror(errno));
+		return -1;
+	}
+
+	fcntl(sock, F_SETFL, O_NONBLOCK);
+	memset(&lr, 0, sizeof(lr));
+	lr.nl_family = AF_NETLINK;
+	lr.nl_groups = RTMGRP_IPV6_ROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_NOTIFY;
+	if (bind(sock, (struct sockaddr *)&lr, sizeof(lr)) < 0) {
+		printf("bind to netlink: %s\n", strerror(errno));
+		ret = -1;
+		goto cleanup;
+	}
+	fds_route.fd = sock;
+	fds_route.events = POLL_IN;
+
+	sock_arp = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+	if (sock_arp < 0) {
+		printf("open netlink socket: %s\n", strerror(errno));
+		return -1;
+	}
+
+	fcntl(sock_arp, F_SETFL, O_NONBLOCK);
+	memset(&la, 0, sizeof(la));
+	la.nl_family = AF_NETLINK;
+	la.nl_groups = RTMGRP_NEIGH | RTMGRP_NOTIFY;
+	if (bind(sock_arp, (struct sockaddr *)&la, sizeof(la)) < 0) {
+		printf("bind to netlink: %s\n", strerror(errno));
+		ret = -1;
+		goto cleanup;
+	}
+	fds_arp.fd = sock_arp;
+	fds_arp.events = POLL_IN;
+
+	memset(prev, 0, sizeof(prev));
+	do {
+		signal(SIGINT, close_and_exit);
+		signal(SIGTERM, close_and_exit);
+
+		sleep(interval);
+		for (key = 0; key < nr_keys; key++) {
+			__u64 sum = 0;
+
+			assert(bpf_map_lookup_elem(map_fd[1], &key, values) == 0);
+			for (i = 0; i < nr_cpus; i++)
+				sum += (values[i] - prev[key][i]);
+			if (sum)
+				printf("proto %u: %10llu pkt/s\n",
+				       key, sum / interval);
+			memcpy(prev[key], values, sizeof(values));
+		}
+
+		memset(buf, 0, sizeof(buf));
+		if (poll(&fds_route, 1, 3) == POLL_IN) {
+			nll = recv_msg(lr, sock);
+			if (nll < 0) {
+				printf("recv from netlink: %s\n", strerror(nll));
+				ret = -1;
+				goto cleanup;
+			}
+
+			nh = (struct nlmsghdr *)buf;
+			printf("Routing table updated.\n");
+			read_route(nh, nll);
+		}
+		memset(buf, 0, sizeof(buf));
+		if (poll(&fds_arp, 1, 3) == POLL_IN) {
+			nll = recv_msg(la, sock_arp);
+			if (nll < 0) {
+				printf("recv from netlink: %s\n", strerror(nll));
+				ret = -1;
+				goto cleanup;
+			}
+
+			nh = (struct nlmsghdr *)buf;
+			read_arp(nh, nll);
+		}
+
+	} while (1);
+cleanup:
+	close(sock);
+	return ret;
+}
+
+int main(int ac, char **argv)
+{
+	char filename[256];
+	char **ifname_list;
+	int i = 1;
+
+	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+	if (ac < 2) {
+		printf("usage: %s [-S] Interface name list\n", argv[0]);
+		return 1;
+	}
+	if (!strcmp(argv[1], "-S")) {
+		flags = XDP_FLAGS_SKB_MODE;
+		total_ifindex = ac - 2;
+		ifname_list = (argv + 2);
+	} else {
+		flags = 0;
+		total_ifindex = ac - 1;
+		ifname_list = (argv + 1);
+	}
+	if (load_bpf_file(filename)) {
+		printf("%s", bpf_log_buf);
+		return 1;
+	}
+	printf("\n**************loading bpf file*********************\n\n\n");
+	if (!prog_fd[0]) {
+		printf("load_bpf_file: %s\n", strerror(errno));
+		return 1;
+	}
+	ifindex_list = (int *)malloc(total_ifindex * sizeof(int *));
+	for (i = 0; i < total_ifindex; i++) {
+		ifindex_list[i] = if_nametoindex(ifname_list[i]);
+		if (!ifindex_list[i]) {
+			printf("Couldn't translate interface name: %s",
+			       strerror(errno));
+			return 1;
+		}
+	}
+	for (i = 0; i < total_ifindex; i++) {
+		if (set_link_xdp_fd(ifindex_list[i], prog_fd[0], flags) < 0) {
+			printf("link set xdp fd failed\n");
+			int recovery_index = i;
+
+			for (i = 0; i < recovery_index; i++)
+				set_link_xdp_fd(ifindex_list[i], -1, flags);
+
+			return 1;
+		}
+		printf("Attached to %d\n", ifindex_list[i]);
+	}
+	signal(SIGINT, int_exit);
+	signal(SIGTERM, int_exit);
+
+	printf("*******************ROUTE TABLE*************************\n\n\n");
+	get_route_table(AF_INET);
+	printf("*******************ARP TABLE***************************\n\n\n");
+	get_arp_table(AF_INET);
+	if (monitor_route() < 0) {
+		printf("Error in receiving route update");
+		return 1;
+	}
+
+	return 0;
+}