Adding upstream version 6.1.0.upstream/6.1.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1864 insertions, 0 deletions

diff --git a/ip/iplink.c b/ip/iplink.c
new file mode 100644
index 0000000..e94dc6a
--- /dev/null
+++ b/ip/iplink.c
@@ -0,0 +1,1864 @@
+/*
+ * iplink.c		"ip link".
+ *
+ *		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.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <dlfcn.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <linux/if.h>
+#include <linux/if_packet.h>
+#include <linux/if_ether.h>
+#include <linux/sockios.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <stdbool.h>
+#include <linux/mpls.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+#include "namespace.h"
+
+#define IPLINK_IOCTL_COMPAT	1
+
+#ifndef GSO_MAX_SEGS
+#define GSO_MAX_SEGS		65535
+#endif
+
+
+static void usage(void) __attribute__((noreturn));
+static int iplink_have_newlink(void);
+
+void iplink_types_usage(void)
+{
+	/* Remember to add new entry here if new type is added. */
+	fprintf(stderr,
+		"TYPE := { amt | bareudp | bond | bond_slave | bridge | bridge_slave |\n"
+		"          dsa | dummy | erspan | geneve | gre | gretap | gtp | ifb |\n"
+		"          ip6erspan | ip6gre | ip6gretap | ip6tnl |\n"
+		"          ipip | ipoib | ipvlan | ipvtap |\n"
+		"          macsec | macvlan | macvtap |\n"
+		"          netdevsim | nlmon | rmnet | sit | team | team_slave |\n"
+		"          vcan | veth | vlan | vrf | vti | vxcan | vxlan | wwan |\n"
+		"          xfrm | virt_wifi }\n");
+}
+
+void iplink_usage(void)
+{
+	if (iplink_have_newlink()) {
+		fprintf(stderr,
+			"Usage: ip link add [link DEV | parentdev NAME] [ name ] NAME\n"
+			"		    [ txqueuelen PACKETS ]\n"
+			"		    [ address LLADDR ]\n"
+			"		    [ broadcast LLADDR ]\n"
+			"		    [ mtu MTU ] [index IDX ]\n"
+			"		    [ numtxqueues QUEUE_COUNT ]\n"
+			"		    [ numrxqueues QUEUE_COUNT ]\n"
+			"		    [ netns { PID | NAME } ]\n"
+			"		    type TYPE [ ARGS ]\n"
+			"\n"
+			"	ip link delete { DEVICE | dev DEVICE | group DEVGROUP } type TYPE [ ARGS ]\n"
+			"\n"
+			"	ip link set { DEVICE | dev DEVICE | group DEVGROUP }\n"
+			"			[ { up | down } ]\n"
+			"			[ type TYPE ARGS ]\n");
+	} else
+		fprintf(stderr,
+			"Usage: ip link set DEVICE [ { up | down } ]\n");
+
+	fprintf(stderr,
+		"		[ arp { on | off } ]\n"
+		"		[ dynamic { on | off } ]\n"
+		"		[ multicast { on | off } ]\n"
+		"		[ allmulticast { on | off } ]\n"
+		"		[ promisc { on | off } ]\n"
+		"		[ trailers { on | off } ]\n"
+		"		[ carrier { on | off } ]\n"
+		"		[ txqueuelen PACKETS ]\n"
+		"		[ name NEWNAME ]\n"
+		"		[ address LLADDR ]\n"
+		"		[ broadcast LLADDR ]\n"
+		"		[ mtu MTU ]\n"
+		"		[ netns { PID | NAME } ]\n"
+		"		[ link-netns NAME | link-netnsid ID ]\n"
+		"		[ alias NAME ]\n"
+		"		[ vf NUM [ mac LLADDR ]\n"
+		"			 [ vlan VLANID [ qos VLAN-QOS ] [ proto VLAN-PROTO ] ]\n"
+		"			 [ rate TXRATE ]\n"
+		"			 [ max_tx_rate TXRATE ]\n"
+		"			 [ min_tx_rate TXRATE ]\n"
+		"			 [ spoofchk { on | off} ]\n"
+		"			 [ query_rss { on | off} ]\n"
+		"			 [ state { auto | enable | disable} ]\n"
+		"			 [ trust { on | off} ]\n"
+		"			 [ node_guid EUI64 ]\n"
+		"			 [ port_guid EUI64 ] ]\n"
+		"		[ { xdp | xdpgeneric | xdpdrv | xdpoffload } { off |\n"
+#ifdef HAVE_LIBBPF
+		"			  object FILE [ { section | program } NAME ] [ verbose ] |\n"
+#else
+		"			  object FILE [ section NAME ] [ verbose ] |\n"
+#endif
+		"			  pinned FILE } ]\n"
+		"		[ master DEVICE ][ vrf NAME ]\n"
+		"		[ nomaster ]\n"
+		"		[ addrgenmode { eui64 | none | stable_secret | random } ]\n"
+		"		[ protodown { on | off } ]\n"
+		"		[ protodown_reason PREASON { on | off } ]\n"
+		"		[ gso_max_size BYTES ] | [ gso_max_segs PACKETS ]\n"
+		"		[ gro_max_size BYTES ]\n"
+		"\n"
+		"	ip link show [ DEVICE | group GROUP ] [up] [master DEV] [vrf NAME] [type TYPE]\n"
+		"		[nomaster]\n"
+		"\n"
+		"	ip link xstats type TYPE [ ARGS ]\n"
+		"\n"
+		"	ip link afstats [ dev DEVICE ]\n"
+		"	ip link property add dev DEVICE [ altname NAME .. ]\n"
+		"	ip link property del dev DEVICE [ altname NAME .. ]\n");
+
+	if (iplink_have_newlink()) {
+		fprintf(stderr,
+			"\n"
+			"	ip link help [ TYPE ]\n"
+			"\n");
+		iplink_types_usage();
+	}
+	exit(-1);
+}
+
+static void usage(void)
+{
+	iplink_usage();
+}
+
+static int on_off(const char *msg, const char *realval)
+{
+	fprintf(stderr,
+		"Error: argument of \"%s\" must be \"on\" or \"off\", not \"%s\"\n",
+		msg, realval);
+	return -1;
+}
+
+static void *BODY;		/* cached dlopen(NULL) handle */
+static struct link_util *linkutil_list;
+
+struct link_util *get_link_kind(const char *id)
+{
+	void *dlh;
+	char buf[256];
+	struct link_util *l;
+
+	for (l = linkutil_list; l; l = l->next)
+		if (strcmp(l->id, id) == 0)
+			return l;
+
+	snprintf(buf, sizeof(buf), "%s/link_%s.so", get_ip_lib_dir(), id);
+	dlh = dlopen(buf, RTLD_LAZY);
+	if (dlh == NULL) {
+		/* look in current binary, only open once */
+		dlh = BODY;
+		if (dlh == NULL) {
+			dlh = BODY = dlopen(NULL, RTLD_LAZY);
+			if (dlh == NULL)
+				return NULL;
+		}
+	}
+
+	snprintf(buf, sizeof(buf), "%s_link_util", id);
+	l = dlsym(dlh, buf);
+	if (l == NULL)
+		return NULL;
+
+	l->next = linkutil_list;
+	linkutil_list = l;
+	return l;
+}
+
+static int get_link_mode(const char *mode)
+{
+	if (strcasecmp(mode, "default") == 0)
+		return IF_LINK_MODE_DEFAULT;
+	if (strcasecmp(mode, "dormant") == 0)
+		return IF_LINK_MODE_DORMANT;
+	return -1;
+}
+
+static int get_addr_gen_mode(const char *mode)
+{
+	if (strcasecmp(mode, "eui64") == 0)
+		return IN6_ADDR_GEN_MODE_EUI64;
+	if (strcasecmp(mode, "none") == 0)
+		return IN6_ADDR_GEN_MODE_NONE;
+	if (strcasecmp(mode, "stable_secret") == 0)
+		return IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
+	if (strcasecmp(mode, "random") == 0)
+		return IN6_ADDR_GEN_MODE_RANDOM;
+	return -1;
+}
+
+#if IPLINK_IOCTL_COMPAT
+static int have_rtnl_newlink = -1;
+
+static int accept_msg(struct rtnl_ctrl_data *ctrl,
+		      struct nlmsghdr *n, void *arg)
+{
+	struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
+
+	if (n->nlmsg_type == NLMSG_ERROR &&
+	    (err->error == -EOPNOTSUPP || err->error == -EINVAL))
+		have_rtnl_newlink = 0;
+	else
+		have_rtnl_newlink = 1;
+	return -1;
+}
+
+static int iplink_have_newlink(void)
+{
+	struct {
+		struct nlmsghdr		n;
+		struct ifinfomsg	i;
+		char			buf[1024];
+	} req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+		.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
+		.n.nlmsg_type = RTM_NEWLINK,
+		.i.ifi_family = AF_UNSPEC,
+	};
+
+	if (have_rtnl_newlink < 0) {
+		if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) {
+			perror("request send failed");
+			exit(1);
+		}
+		rtnl_listen(&rth, accept_msg, NULL);
+	}
+	return have_rtnl_newlink;
+}
+#else /* IPLINK_IOCTL_COMPAT */
+static int iplink_have_newlink(void)
+{
+	return 1;
+}
+#endif /* ! IPLINK_IOCTL_COMPAT */
+
+static int nl_get_ll_addr_len(const char *ifname)
+{
+	int len;
+	int dev_index = ll_name_to_index(ifname);
+	struct iplink_req req = {
+		.n = {
+			.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+			.nlmsg_type = RTM_GETLINK,
+			.nlmsg_flags = NLM_F_REQUEST
+		},
+		.i = {
+			.ifi_family = preferred_family,
+			.ifi_index = dev_index,
+		}
+	};
+	struct nlmsghdr *answer;
+	struct rtattr *tb[IFLA_MAX+1];
+
+	if (dev_index == 0)
+		return -1;
+
+	if (rtnl_talk(&rth, &req.n, &answer) < 0)
+		return -1;
+
+	len = answer->nlmsg_len - NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	if (len < 0) {
+		free(answer);
+		return -1;
+	}
+
+	parse_rtattr_flags(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)),
+			   len, NLA_F_NESTED);
+	if (!tb[IFLA_ADDRESS]) {
+		free(answer);
+		return -1;
+	}
+
+	len = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
+	free(answer);
+	return len;
+}
+
+static void iplink_parse_vf_vlan_info(int vf, int *argcp, char ***argvp,
+				      struct ifla_vf_vlan_info *ivvip)
+{
+	int argc = *argcp;
+	char **argv = *argvp;
+	unsigned int vci;
+
+	NEXT_ARG();
+	if (get_unsigned(&vci, *argv, 0) || vci > 4095)
+		invarg("Invalid \"vlan\" value\n", *argv);
+
+	ivvip->vlan = vci;
+	ivvip->vf = vf;
+	ivvip->qos = 0;
+	ivvip->vlan_proto = htons(ETH_P_8021Q);
+	if (NEXT_ARG_OK()) {
+		NEXT_ARG();
+		if (matches(*argv, "qos") == 0) {
+			NEXT_ARG();
+			if (get_unsigned(&ivvip->qos, *argv, 0))
+				invarg("Invalid \"qos\" value\n", *argv);
+		} else {
+			/* rewind arg */
+			PREV_ARG();
+		}
+	}
+	if (NEXT_ARG_OK()) {
+		NEXT_ARG();
+		if (matches(*argv, "proto") == 0) {
+			NEXT_ARG();
+			if (ll_proto_a2n(&ivvip->vlan_proto, *argv))
+				invarg("protocol is invalid\n", *argv);
+			if (ivvip->vlan_proto != htons(ETH_P_8021AD) &&
+			    ivvip->vlan_proto != htons(ETH_P_8021Q)) {
+				SPRINT_BUF(b1);
+				SPRINT_BUF(b2);
+				char msg[64 + sizeof(b1) + sizeof(b2)];
+
+				sprintf(msg,
+					"Invalid \"vlan protocol\" value - supported %s, %s\n",
+					ll_proto_n2a(htons(ETH_P_8021Q),
+					     b1, sizeof(b1)),
+					ll_proto_n2a(htons(ETH_P_8021AD),
+					     b2, sizeof(b2)));
+				invarg(msg, *argv);
+			}
+		} else {
+			/* rewind arg */
+			PREV_ARG();
+		}
+	}
+
+	*argcp = argc;
+	*argvp = argv;
+}
+
+static int iplink_parse_vf(int vf, int *argcp, char ***argvp,
+			   struct iplink_req *req, const char *dev)
+{
+	char new_rate_api = 0, count = 0, override_legacy_rate = 0;
+	struct ifla_vf_rate tivt;
+	int len, argc = *argcp;
+	char **argv = *argvp;
+	struct rtattr *vfinfo;
+	int ret;
+
+	tivt.min_tx_rate = -1;
+	tivt.max_tx_rate = -1;
+
+	vfinfo = addattr_nest(&req->n, sizeof(*req), IFLA_VF_INFO);
+
+	while (NEXT_ARG_OK()) {
+		NEXT_ARG();
+		count++;
+		if (!matches(*argv, "max_tx_rate")) {
+			/* new API in use */
+			new_rate_api = 1;
+			/* override legacy rate */
+			override_legacy_rate = 1;
+		} else if (!matches(*argv, "min_tx_rate")) {
+			/* new API in use */
+			new_rate_api = 1;
+		}
+	}
+
+	while (count--) {
+		/* rewind arg */
+		PREV_ARG();
+	}
+
+	while (NEXT_ARG_OK()) {
+		NEXT_ARG();
+		if (matches(*argv, "mac") == 0) {
+			struct ifla_vf_mac ivm = { 0 };
+			int halen = nl_get_ll_addr_len(dev);
+
+			NEXT_ARG();
+			ivm.vf = vf;
+			len = ll_addr_a2n((char *)ivm.mac, 32, *argv);
+			if (len < 0)
+				return -1;
+			if (halen > 0 && len != halen) {
+				fprintf(stderr,
+					"Invalid address length %d - must be %d bytes\n",
+					len, halen);
+				return -1;
+			}
+			addattr_l(&req->n, sizeof(*req), IFLA_VF_MAC,
+				  &ivm, sizeof(ivm));
+		} else if (matches(*argv, "vlan") == 0) {
+			struct ifla_vf_vlan_info ivvi;
+
+			iplink_parse_vf_vlan_info(vf, &argc, &argv, &ivvi);
+			/* support the old interface in case of older kernel*/
+			if (ivvi.vlan_proto == htons(ETH_P_8021Q)) {
+				struct ifla_vf_vlan ivv;
+
+				ivv.vf = ivvi.vf;
+				ivv.vlan = ivvi.vlan;
+				ivv.qos = ivvi.qos;
+				addattr_l(&req->n, sizeof(*req),
+					  IFLA_VF_VLAN, &ivv, sizeof(ivv));
+			} else {
+				struct rtattr *vfvlanlist;
+
+				vfvlanlist = addattr_nest(&req->n, sizeof(*req),
+							  IFLA_VF_VLAN_LIST);
+				addattr_l(&req->n, sizeof(*req),
+					  IFLA_VF_VLAN_INFO, &ivvi,
+					  sizeof(ivvi));
+
+				while (NEXT_ARG_OK()) {
+					NEXT_ARG();
+					if (matches(*argv, "vlan") != 0) {
+						PREV_ARG();
+						break;
+					}
+					iplink_parse_vf_vlan_info(vf, &argc,
+								  &argv, &ivvi);
+					addattr_l(&req->n, sizeof(*req),
+						  IFLA_VF_VLAN_INFO, &ivvi,
+						  sizeof(ivvi));
+				}
+				addattr_nest_end(&req->n, vfvlanlist);
+			}
+		} else if (matches(*argv, "rate") == 0) {
+			struct ifla_vf_tx_rate ivt;
+
+			NEXT_ARG();
+			if (get_unsigned(&ivt.rate, *argv, 0))
+				invarg("Invalid \"rate\" value\n", *argv);
+
+			ivt.vf = vf;
+			if (!new_rate_api)
+				addattr_l(&req->n, sizeof(*req),
+					  IFLA_VF_TX_RATE, &ivt, sizeof(ivt));
+			else if (!override_legacy_rate)
+				tivt.max_tx_rate = ivt.rate;
+
+		} else if (matches(*argv, "max_tx_rate") == 0) {
+			NEXT_ARG();
+			if (get_unsigned(&tivt.max_tx_rate, *argv, 0))
+				invarg("Invalid \"max tx rate\" value\n",
+				       *argv);
+			tivt.vf = vf;
+
+		} else if (matches(*argv, "min_tx_rate") == 0) {
+			NEXT_ARG();
+			if (get_unsigned(&tivt.min_tx_rate, *argv, 0))
+				invarg("Invalid \"min tx rate\" value\n",
+				       *argv);
+			tivt.vf = vf;
+
+		} else if (matches(*argv, "spoofchk") == 0) {
+			struct ifla_vf_spoofchk ivs;
+
+			NEXT_ARG();
+			ivs.setting = parse_on_off("spoofchk", *argv, &ret);
+			if (ret)
+				return ret;
+			ivs.vf = vf;
+			addattr_l(&req->n, sizeof(*req), IFLA_VF_SPOOFCHK,
+				  &ivs, sizeof(ivs));
+
+		} else if (matches(*argv, "query_rss") == 0) {
+			struct ifla_vf_rss_query_en ivs;
+
+			NEXT_ARG();
+			ivs.setting = parse_on_off("query_rss", *argv, &ret);
+			if (ret)
+				return ret;
+			ivs.vf = vf;
+			addattr_l(&req->n, sizeof(*req), IFLA_VF_RSS_QUERY_EN,
+				  &ivs, sizeof(ivs));
+
+		} else if (matches(*argv, "trust") == 0) {
+			struct ifla_vf_trust ivt;
+
+			NEXT_ARG();
+			ivt.setting = parse_on_off("trust", *argv, &ret);
+			if (ret)
+				return ret;
+			ivt.vf = vf;
+			addattr_l(&req->n, sizeof(*req), IFLA_VF_TRUST,
+				  &ivt, sizeof(ivt));
+
+		} else if (matches(*argv, "state") == 0) {
+			struct ifla_vf_link_state ivl;
+
+			NEXT_ARG();
+			if (matches(*argv, "auto") == 0)
+				ivl.link_state = IFLA_VF_LINK_STATE_AUTO;
+			else if (matches(*argv, "enable") == 0)
+				ivl.link_state = IFLA_VF_LINK_STATE_ENABLE;
+			else if (matches(*argv, "disable") == 0)
+				ivl.link_state = IFLA_VF_LINK_STATE_DISABLE;
+			else
+				invarg("Invalid \"state\" value\n", *argv);
+			ivl.vf = vf;
+			addattr_l(&req->n, sizeof(*req), IFLA_VF_LINK_STATE,
+				  &ivl, sizeof(ivl));
+		} else if (matches(*argv, "node_guid") == 0) {
+			struct ifla_vf_guid ivg;
+
+			NEXT_ARG();
+			ivg.vf = vf;
+			if (get_guid(&ivg.guid, *argv)) {
+				invarg("Invalid GUID format\n", *argv);
+				return -1;
+			}
+			addattr_l(&req->n, sizeof(*req), IFLA_VF_IB_NODE_GUID,
+				  &ivg, sizeof(ivg));
+		} else if (matches(*argv, "port_guid") == 0) {
+			struct ifla_vf_guid ivg;
+
+			NEXT_ARG();
+			ivg.vf = vf;
+			if (get_guid(&ivg.guid, *argv)) {
+				invarg("Invalid GUID format\n", *argv);
+				return -1;
+			}
+			addattr_l(&req->n, sizeof(*req), IFLA_VF_IB_PORT_GUID,
+				  &ivg, sizeof(ivg));
+		} else {
+			/* rewind arg */
+			PREV_ARG();
+			break;
+		}
+	}
+
+	if (new_rate_api) {
+		int tmin, tmax;
+
+		if (tivt.min_tx_rate == -1 || tivt.max_tx_rate == -1) {
+			ipaddr_get_vf_rate(tivt.vf, &tmin, &tmax, dev);
+			if (tivt.min_tx_rate == -1)
+				tivt.min_tx_rate = tmin;
+			if (tivt.max_tx_rate == -1)
+				tivt.max_tx_rate = tmax;
+		}
+
+		if (tivt.max_tx_rate && tivt.min_tx_rate > tivt.max_tx_rate) {
+			fprintf(stderr,
+				"Invalid min_tx_rate %d - must be <= max_tx_rate %d\n",
+				tivt.min_tx_rate, tivt.max_tx_rate);
+			return -1;
+		}
+
+		addattr_l(&req->n, sizeof(*req), IFLA_VF_RATE, &tivt,
+			  sizeof(tivt));
+	}
+
+	if (argc == *argcp)
+		incomplete_command();
+
+	addattr_nest_end(&req->n, vfinfo);
+
+	*argcp = argc;
+	*argvp = argv;
+	return 0;
+}
+
+int iplink_parse(int argc, char **argv, struct iplink_req *req, char **type)
+{
+	bool move_netns = false;
+	char *name = NULL;
+	char *dev = NULL;
+	char *link = NULL;
+	int ret, len;
+	char abuf[32];
+	int qlen = -1;
+	int mtu = -1;
+	int netns = -1;
+	int vf = -1;
+	int numtxqueues = -1;
+	int numrxqueues = -1;
+	int link_netnsid = -1;
+	int index = 0;
+	int group = -1;
+	int addr_len = 0;
+	int err;
+
+	ret = argc;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "up") == 0) {
+			req->i.ifi_change |= IFF_UP;
+			req->i.ifi_flags |= IFF_UP;
+		} else if (strcmp(*argv, "down") == 0) {
+			req->i.ifi_change |= IFF_UP;
+			req->i.ifi_flags &= ~IFF_UP;
+		} else if (strcmp(*argv, "name") == 0) {
+			NEXT_ARG();
+			if (name)
+				duparg("name", *argv);
+			if (check_ifname(*argv))
+				invarg("\"name\" not a valid ifname", *argv);
+			name = *argv;
+			if (!dev)
+				dev = name;
+		} else if (strcmp(*argv, "index") == 0) {
+			NEXT_ARG();
+			if (index)
+				duparg("index", *argv);
+			index = atoi(*argv);
+			if (index <= 0)
+				invarg("Invalid \"index\" value", *argv);
+		} else if (matches(*argv, "link") == 0) {
+			NEXT_ARG();
+			link = *argv;
+		} else if (matches(*argv, "address") == 0) {
+			NEXT_ARG();
+			addr_len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
+			if (addr_len < 0)
+				return -1;
+			addattr_l(&req->n, sizeof(*req),
+				  IFLA_ADDRESS, abuf, addr_len);
+		} else if (matches(*argv, "broadcast") == 0 ||
+			   strcmp(*argv, "brd") == 0) {
+			NEXT_ARG();
+			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
+			if (len < 0)
+				return -1;
+			addattr_l(&req->n, sizeof(*req),
+				  IFLA_BROADCAST, abuf, len);
+		} else if (matches(*argv, "txqueuelen") == 0 ||
+			   strcmp(*argv, "qlen") == 0 ||
+			   matches(*argv, "txqlen") == 0) {
+			NEXT_ARG();
+			if (qlen != -1)
+				duparg("txqueuelen", *argv);
+			if (get_integer(&qlen,  *argv, 0))
+				invarg("Invalid \"txqueuelen\" value\n", *argv);
+			addattr_l(&req->n, sizeof(*req),
+				  IFLA_TXQLEN, &qlen, 4);
+		} else if (strcmp(*argv, "mtu") == 0) {
+			NEXT_ARG();
+			if (mtu != -1)
+				duparg("mtu", *argv);
+			if (get_integer(&mtu, *argv, 0))
+				invarg("Invalid \"mtu\" value\n", *argv);
+			addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
+		} else if (strcmp(*argv, "xdpgeneric") == 0 ||
+			   strcmp(*argv, "xdpdrv") == 0 ||
+			   strcmp(*argv, "xdpoffload") == 0 ||
+			   strcmp(*argv, "xdp") == 0) {
+			bool generic = strcmp(*argv, "xdpgeneric") == 0;
+			bool drv = strcmp(*argv, "xdpdrv") == 0;
+			bool offload = strcmp(*argv, "xdpoffload") == 0;
+
+			NEXT_ARG();
+			if (xdp_parse(&argc, &argv, req, dev,
+				      generic, drv, offload))
+				exit(-1);
+
+			if (offload && name == dev)
+				dev = NULL;
+		} else if (strcmp(*argv, "netns") == 0) {
+			NEXT_ARG();
+			if (netns != -1)
+				duparg("netns", *argv);
+			netns = netns_get_fd(*argv);
+			if (netns >= 0)
+				addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_FD,
+					  &netns, 4);
+			else if (get_integer(&netns, *argv, 0) == 0)
+				addattr_l(&req->n, sizeof(*req),
+					  IFLA_NET_NS_PID, &netns, 4);
+			else
+				invarg("Invalid \"netns\" value\n", *argv);
+			move_netns = true;
+		} else if (strcmp(*argv, "multicast") == 0) {
+			NEXT_ARG();
+			req->i.ifi_change |= IFF_MULTICAST;
+
+			if (strcmp(*argv, "on") == 0)
+				req->i.ifi_flags |= IFF_MULTICAST;
+			else if (strcmp(*argv, "off") == 0)
+				req->i.ifi_flags &= ~IFF_MULTICAST;
+			else
+				return on_off("multicast", *argv);
+		} else if (strcmp(*argv, "allmulticast") == 0) {
+			NEXT_ARG();
+			req->i.ifi_change |= IFF_ALLMULTI;
+
+			if (strcmp(*argv, "on") == 0)
+				req->i.ifi_flags |= IFF_ALLMULTI;
+			else if (strcmp(*argv, "off") == 0)
+				req->i.ifi_flags &= ~IFF_ALLMULTI;
+			else
+				return on_off("allmulticast", *argv);
+		} else if (strcmp(*argv, "promisc") == 0) {
+			NEXT_ARG();
+			req->i.ifi_change |= IFF_PROMISC;
+
+			if (strcmp(*argv, "on") == 0)
+				req->i.ifi_flags |= IFF_PROMISC;
+			else if (strcmp(*argv, "off") == 0)
+				req->i.ifi_flags &= ~IFF_PROMISC;
+			else
+				return on_off("promisc", *argv);
+		} else if (strcmp(*argv, "trailers") == 0) {
+			NEXT_ARG();
+			req->i.ifi_change |= IFF_NOTRAILERS;
+
+			if (strcmp(*argv, "off") == 0)
+				req->i.ifi_flags |= IFF_NOTRAILERS;
+			else if (strcmp(*argv, "on") == 0)
+				req->i.ifi_flags &= ~IFF_NOTRAILERS;
+			else
+				return on_off("trailers", *argv);
+		} else if (strcmp(*argv, "arp") == 0) {
+			NEXT_ARG();
+			req->i.ifi_change |= IFF_NOARP;
+
+			if (strcmp(*argv, "on") == 0)
+				req->i.ifi_flags &= ~IFF_NOARP;
+			else if (strcmp(*argv, "off") == 0)
+				req->i.ifi_flags |= IFF_NOARP;
+			else
+				return on_off("arp", *argv);
+		} else if (strcmp(*argv, "carrier") == 0) {
+			int carrier;
+
+			NEXT_ARG();
+			carrier = parse_on_off("carrier", *argv, &err);
+			if (err)
+				return err;
+
+			addattr8(&req->n, sizeof(*req), IFLA_CARRIER, carrier);
+		} else if (strcmp(*argv, "vf") == 0) {
+			struct rtattr *vflist;
+
+			NEXT_ARG();
+			if (get_integer(&vf,  *argv, 0))
+				invarg("Invalid \"vf\" value\n", *argv);
+
+			vflist = addattr_nest(&req->n, sizeof(*req),
+					      IFLA_VFINFO_LIST);
+			if (!dev)
+				missarg("dev");
+
+			len = iplink_parse_vf(vf, &argc, &argv, req, dev);
+			if (len < 0)
+				return -1;
+			addattr_nest_end(&req->n, vflist);
+
+			if (name == dev)
+				dev = NULL;
+		} else if (matches(*argv, "master") == 0) {
+			int ifindex;
+
+			NEXT_ARG();
+			ifindex = ll_name_to_index(*argv);
+			if (!ifindex)
+				invarg("Device does not exist\n", *argv);
+			addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
+				  &ifindex, 4);
+		} else if (strcmp(*argv, "vrf") == 0) {
+			int ifindex;
+
+			NEXT_ARG();
+			ifindex = ll_name_to_index(*argv);
+			if (!ifindex)
+				invarg("Not a valid VRF name\n", *argv);
+			if (!name_is_vrf(*argv))
+				invarg("Not a valid VRF name\n", *argv);
+			addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
+				  &ifindex, sizeof(ifindex));
+		} else if (matches(*argv, "nomaster") == 0) {
+			int ifindex = 0;
+
+			addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
+				  &ifindex, 4);
+		} else if (matches(*argv, "dynamic") == 0) {
+			NEXT_ARG();
+			req->i.ifi_change |= IFF_DYNAMIC;
+
+			if (strcmp(*argv, "on") == 0)
+				req->i.ifi_flags |= IFF_DYNAMIC;
+			else if (strcmp(*argv, "off") == 0)
+				req->i.ifi_flags &= ~IFF_DYNAMIC;
+			else
+				return on_off("dynamic", *argv);
+		} else if (matches(*argv, "type") == 0) {
+			NEXT_ARG();
+			*type = *argv;
+			argc--; argv++;
+			break;
+		} else if (matches(*argv, "alias") == 0) {
+			NEXT_ARG();
+			len = strlen(*argv);
+			if (len >= IFALIASZ)
+				invarg("alias too long\n", *argv);
+			addattr_l(&req->n, sizeof(*req), IFLA_IFALIAS,
+				  *argv, len);
+		} else if (strcmp(*argv, "group") == 0) {
+			NEXT_ARG();
+			if (group != -1)
+				duparg("group", *argv);
+			if (rtnl_group_a2n(&group, *argv))
+				invarg("Invalid \"group\" value\n", *argv);
+			addattr32(&req->n, sizeof(*req), IFLA_GROUP, group);
+		} else if (strcmp(*argv, "mode") == 0) {
+			int mode;
+
+			NEXT_ARG();
+			mode = get_link_mode(*argv);
+			if (mode < 0)
+				invarg("Invalid link mode\n", *argv);
+			addattr8(&req->n, sizeof(*req), IFLA_LINKMODE, mode);
+		} else if (strcmp(*argv, "state") == 0) {
+			int state;
+
+			NEXT_ARG();
+			state = get_operstate(*argv);
+			if (state < 0)
+				invarg("Invalid operstate\n", *argv);
+
+			addattr8(&req->n, sizeof(*req), IFLA_OPERSTATE, state);
+		} else if (matches(*argv, "numtxqueues") == 0) {
+			NEXT_ARG();
+			if (numtxqueues != -1)
+				duparg("numtxqueues", *argv);
+			if (get_integer(&numtxqueues, *argv, 0))
+				invarg("Invalid \"numtxqueues\" value\n",
+				       *argv);
+			addattr_l(&req->n, sizeof(*req), IFLA_NUM_TX_QUEUES,
+				  &numtxqueues, 4);
+		} else if (matches(*argv, "numrxqueues") == 0) {
+			NEXT_ARG();
+			if (numrxqueues != -1)
+				duparg("numrxqueues", *argv);
+			if (get_integer(&numrxqueues, *argv, 0))
+				invarg("Invalid \"numrxqueues\" value\n",
+				       *argv);
+			addattr_l(&req->n, sizeof(*req), IFLA_NUM_RX_QUEUES,
+				  &numrxqueues, 4);
+		} else if (matches(*argv, "addrgenmode") == 0) {
+			struct rtattr *afs, *afs6;
+			int mode;
+
+			NEXT_ARG();
+			mode = get_addr_gen_mode(*argv);
+			if (mode < 0)
+				invarg("Invalid address generation mode\n",
+				       *argv);
+			afs = addattr_nest(&req->n, sizeof(*req), IFLA_AF_SPEC);
+			afs6 = addattr_nest(&req->n, sizeof(*req), AF_INET6);
+			addattr8(&req->n, sizeof(*req),
+				 IFLA_INET6_ADDR_GEN_MODE, mode);
+			addattr_nest_end(&req->n, afs6);
+			addattr_nest_end(&req->n, afs);
+		} else if (matches(*argv, "link-netns") == 0) {
+			NEXT_ARG();
+			if (link_netnsid != -1)
+				duparg("link-netns/link-netnsid", *argv);
+			link_netnsid = get_netnsid_from_name(*argv);
+			/* No nsid? Try to assign one. */
+			if (link_netnsid < 0)
+				set_netnsid_from_name(*argv, -1);
+			link_netnsid = get_netnsid_from_name(*argv);
+			if (link_netnsid < 0)
+				invarg("Invalid \"link-netns\" value\n",
+				       *argv);
+			addattr32(&req->n, sizeof(*req), IFLA_LINK_NETNSID,
+				  link_netnsid);
+		} else if (matches(*argv, "link-netnsid") == 0) {
+			NEXT_ARG();
+			if (link_netnsid != -1)
+				duparg("link-netns/link-netnsid", *argv);
+			if (get_integer(&link_netnsid, *argv, 0))
+				invarg("Invalid \"link-netnsid\" value\n",
+				       *argv);
+			addattr32(&req->n, sizeof(*req), IFLA_LINK_NETNSID,
+				  link_netnsid);
+		} else if (strcmp(*argv, "protodown") == 0) {
+			unsigned int proto_down;
+
+			NEXT_ARG();
+			proto_down = parse_on_off("protodown", *argv, &err);
+			if (err)
+				return err;
+			addattr8(&req->n, sizeof(*req), IFLA_PROTO_DOWN,
+				 proto_down);
+		} else if (strcmp(*argv, "protodown_reason") == 0) {
+			struct rtattr *pr;
+			__u32 preason = 0, prvalue = 0, prmask = 0;
+
+			NEXT_ARG();
+			if (protodown_reason_a2n(&preason, *argv))
+				invarg("invalid protodown reason\n", *argv);
+			NEXT_ARG();
+			prmask = 1 << preason;
+			if (matches(*argv, "on") == 0)
+				prvalue |= prmask;
+			else if (matches(*argv, "off") == 0)
+				prvalue &= ~prmask;
+			else
+				return on_off("protodown_reason", *argv);
+			pr = addattr_nest(&req->n, sizeof(*req),
+					  IFLA_PROTO_DOWN_REASON | NLA_F_NESTED);
+			addattr32(&req->n, sizeof(*req),
+				  IFLA_PROTO_DOWN_REASON_MASK, prmask);
+			addattr32(&req->n, sizeof(*req),
+				  IFLA_PROTO_DOWN_REASON_VALUE, prvalue);
+			addattr_nest_end(&req->n, pr);
+		} else if (strcmp(*argv, "gso_max_size") == 0) {
+			unsigned int max_size;
+
+			NEXT_ARG();
+			if (get_unsigned(&max_size, *argv, 0))
+				invarg("Invalid \"gso_max_size\" value\n",
+				       *argv);
+			addattr32(&req->n, sizeof(*req),
+				  IFLA_GSO_MAX_SIZE, max_size);
+		} else if (strcmp(*argv, "gso_max_segs") == 0) {
+			unsigned int max_segs;
+
+			NEXT_ARG();
+			if (get_unsigned(&max_segs, *argv, 0) ||
+			    max_segs > GSO_MAX_SEGS)
+				invarg("Invalid \"gso_max_segs\" value\n",
+				       *argv);
+			addattr32(&req->n, sizeof(*req),
+				  IFLA_GSO_MAX_SEGS, max_segs);
+		}  else if (strcmp(*argv, "gro_max_size") == 0) {
+			unsigned int max_size;
+
+			NEXT_ARG();
+			if (get_unsigned(&max_size, *argv, 0))
+				invarg("Invalid \"gro_max_size\" value\n",
+				       *argv);
+			addattr32(&req->n, sizeof(*req),
+				  IFLA_GRO_MAX_SIZE, max_size);
+		} else if (strcmp(*argv, "parentdev") == 0) {
+			NEXT_ARG();
+			addattr_l(&req->n, sizeof(*req), IFLA_PARENT_DEV_NAME,
+				  *argv, strlen(*argv) + 1);
+		} else {
+			if (matches(*argv, "help") == 0)
+				usage();
+
+			if (strcmp(*argv, "dev") == 0)
+				NEXT_ARG();
+			if (dev != name)
+				duparg2("dev", *argv);
+			if (check_altifname(*argv))
+				invarg("\"dev\" not a valid ifname", *argv);
+			dev = *argv;
+		}
+		argc--; argv++;
+	}
+
+	ret -= argc;
+
+	/* Allow "ip link add dev" and "ip link add name" */
+	if (!name)
+		name = dev;
+	else if (!dev)
+		dev = name;
+	else if (!strcmp(name, dev))
+		name = dev;
+
+	if (dev && addr_len &&
+	    !(req->n.nlmsg_flags & NLM_F_CREATE)) {
+		int halen = nl_get_ll_addr_len(dev);
+
+		if (halen >= 0 && halen != addr_len) {
+			fprintf(stderr,
+				"Invalid address length %d - must be %d bytes\n",
+				addr_len, halen);
+			return -1;
+		}
+	}
+
+	if (index &&
+	    (!(req->n.nlmsg_flags & NLM_F_CREATE) &&
+	     !move_netns)) {
+		fprintf(stderr,
+			"index can be used only when creating devices or when moving device to another netns.\n");
+		exit(-1);
+	}
+
+	if (group != -1) {
+		if (!dev) {
+			if (argc) {
+				fprintf(stderr,
+					"Garbage instead of arguments \"%s ...\". Try \"ip link help\".\n",
+					*argv);
+				exit(-1);
+			}
+			if (req->n.nlmsg_flags & NLM_F_CREATE) {
+				fprintf(stderr,
+					"group cannot be used when creating devices.\n");
+				exit(-1);
+			}
+
+			*type = NULL;
+			return ret;
+		}
+	}
+
+	if (!(req->n.nlmsg_flags & NLM_F_CREATE)) {
+		if (!dev) {
+			fprintf(stderr,
+				"Not enough information: \"dev\" argument is required.\n");
+			exit(-1);
+		}
+
+		req->i.ifi_index = ll_name_to_index(dev);
+		if (!req->i.ifi_index)
+			return nodev(dev);
+
+		/* Not renaming to the same name */
+		if (name == dev)
+			name = NULL;
+
+		if (index)
+			addattr32(&req->n, sizeof(*req), IFLA_NEW_IFINDEX, index);
+	} else {
+		if (name != dev) {
+			fprintf(stderr,
+				"both \"name\" and \"dev\" cannot be used when creating devices.\n");
+			exit(-1);
+		}
+
+		if (link) {
+			int ifindex;
+
+			ifindex = ll_name_to_index(link);
+			if (!ifindex)
+				return nodev(link);
+			addattr32(&req->n, sizeof(*req), IFLA_LINK, ifindex);
+		}
+
+		req->i.ifi_index = index;
+	}
+
+	if (name) {
+		addattr_l(&req->n, sizeof(*req),
+			  IFLA_IFNAME, name, strlen(name) + 1);
+	}
+
+	return ret;
+}
+
+static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
+{
+	char *type = NULL;
+	struct iplink_req req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+		.n.nlmsg_flags = NLM_F_REQUEST | flags,
+		.n.nlmsg_type = cmd,
+		.i.ifi_family = preferred_family,
+	};
+	int ret;
+
+	ret = iplink_parse(argc, argv, &req, &type);
+	if (ret < 0)
+		return ret;
+
+	if (type) {
+		struct link_util *lu;
+		struct rtattr *linkinfo;
+		char *ulinep = strchr(type, '_');
+		int iflatype;
+
+		linkinfo = addattr_nest(&req.n, sizeof(req), IFLA_LINKINFO);
+		addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
+			 strlen(type));
+
+		lu = get_link_kind(type);
+		if (ulinep && !strcmp(ulinep, "_slave"))
+			iflatype = IFLA_INFO_SLAVE_DATA;
+		else
+			iflatype = IFLA_INFO_DATA;
+
+		argc -= ret;
+		argv += ret;
+
+		if (lu && argc) {
+			struct rtattr *data;
+
+			data = addattr_nest(&req.n, sizeof(req), iflatype);
+
+			if (lu->parse_opt &&
+			    lu->parse_opt(lu, argc, argv, &req.n))
+				return -1;
+
+			addattr_nest_end(&req.n, data);
+		} else if (argc) {
+			if (matches(*argv, "help") == 0)
+				usage();
+			fprintf(stderr,
+				"Garbage instead of arguments \"%s ...\". Try \"ip link help\".\n",
+				*argv);
+			return -1;
+		}
+		addattr_nest_end(&req.n, linkinfo);
+	} else if (flags & NLM_F_CREATE) {
+		fprintf(stderr,
+			"Not enough information: \"type\" argument is required\n");
+		return -1;
+	}
+
+	if (echo_request)
+		ret = rtnl_echo_talk(&rth, &req.n, json, print_linkinfo);
+	else
+		ret = rtnl_talk(&rth, &req.n, NULL);
+
+	if (ret)
+		return -2;
+
+	/* remove device from cache; next use can refresh with new data */
+	ll_drop_by_index(req.i.ifi_index);
+
+	return 0;
+}
+
+int iplink_get(char *name, __u32 filt_mask)
+{
+	struct iplink_req req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+		.n.nlmsg_flags = NLM_F_REQUEST,
+		.n.nlmsg_type = RTM_GETLINK,
+		.i.ifi_family = preferred_family,
+	};
+	struct nlmsghdr *answer;
+
+	if (name) {
+		addattr_l(&req.n, sizeof(req),
+			  !check_ifname(name) ? IFLA_IFNAME : IFLA_ALT_IFNAME,
+			  name, strlen(name) + 1);
+	}
+	addattr32(&req.n, sizeof(req), IFLA_EXT_MASK, filt_mask);
+
+	if (rtnl_talk(&rth, &req.n, &answer) < 0)
+		return -2;
+
+	open_json_object(NULL);
+	print_linkinfo(answer, stdout);
+	close_json_object();
+
+	free(answer);
+	return 0;
+}
+
+#if IPLINK_IOCTL_COMPAT
+static int get_ctl_fd(void)
+{
+	int s_errno;
+	int fd;
+
+	fd = socket(PF_INET, SOCK_DGRAM, 0);
+	if (fd >= 0)
+		return fd;
+	s_errno = errno;
+	fd = socket(PF_PACKET, SOCK_DGRAM, 0);
+	if (fd >= 0)
+		return fd;
+	fd = socket(PF_INET6, SOCK_DGRAM, 0);
+	if (fd >= 0)
+		return fd;
+	errno = s_errno;
+	perror("Cannot create control socket");
+	return -1;
+}
+
+static int do_chflags(const char *dev, __u32 flags, __u32 mask)
+{
+	struct ifreq ifr;
+	int fd;
+	int err;
+
+	strlcpy(ifr.ifr_name, dev, IFNAMSIZ);
+	fd = get_ctl_fd();
+	if (fd < 0)
+		return -1;
+	err = ioctl(fd, SIOCGIFFLAGS, &ifr);
+	if (err) {
+		perror("SIOCGIFFLAGS");
+		close(fd);
+		return -1;
+	}
+	if ((ifr.ifr_flags^flags)&mask) {
+		ifr.ifr_flags &= ~mask;
+		ifr.ifr_flags |= mask&flags;
+		err = ioctl(fd, SIOCSIFFLAGS, &ifr);
+		if (err)
+			perror("SIOCSIFFLAGS");
+	}
+	close(fd);
+	return err;
+}
+
+static int do_changename(const char *dev, const char *newdev)
+{
+	struct ifreq ifr;
+	int fd;
+	int err;
+
+	strlcpy(ifr.ifr_name, dev, IFNAMSIZ);
+	strlcpy(ifr.ifr_newname, newdev, IFNAMSIZ);
+	fd = get_ctl_fd();
+	if (fd < 0)
+		return -1;
+	err = ioctl(fd, SIOCSIFNAME, &ifr);
+	if (err) {
+		perror("SIOCSIFNAME");
+		close(fd);
+		return -1;
+	}
+	close(fd);
+	return err;
+}
+
+static int set_qlen(const char *dev, int qlen)
+{
+	struct ifreq ifr = { .ifr_qlen = qlen };
+	int s;
+
+	s = get_ctl_fd();
+	if (s < 0)
+		return -1;
+
+	strlcpy(ifr.ifr_name, dev, IFNAMSIZ);
+	if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
+		perror("SIOCSIFXQLEN");
+		close(s);
+		return -1;
+	}
+	close(s);
+
+	return 0;
+}
+
+static int set_mtu(const char *dev, int mtu)
+{
+	struct ifreq ifr = { .ifr_mtu = mtu };
+	int s;
+
+	s = get_ctl_fd();
+	if (s < 0)
+		return -1;
+
+	strlcpy(ifr.ifr_name, dev, IFNAMSIZ);
+	if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
+		perror("SIOCSIFMTU");
+		close(s);
+		return -1;
+	}
+	close(s);
+
+	return 0;
+}
+
+static int get_address(const char *dev, int *htype)
+{
+	struct ifreq ifr = {};
+	struct sockaddr_ll me = {
+		.sll_family = AF_PACKET,
+		.sll_protocol = htons(ETH_P_LOOP),
+	};
+	socklen_t alen;
+	int s;
+
+	s = socket(PF_PACKET, SOCK_DGRAM, 0);
+	if (s < 0) {
+		perror("socket(PF_PACKET)");
+		return -1;
+	}
+
+	strlcpy(ifr.ifr_name, dev, IFNAMSIZ);
+	if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
+		perror("SIOCGIFINDEX");
+		close(s);
+		return -1;
+	}
+
+	me.sll_ifindex = ifr.ifr_ifindex;
+	if (bind(s, (struct sockaddr *)&me, sizeof(me)) == -1) {
+		perror("bind");
+		close(s);
+		return -1;
+	}
+
+	alen = sizeof(me);
+	if (getsockname(s, (struct sockaddr *)&me, &alen) == -1) {
+		perror("getsockname");
+		close(s);
+		return -1;
+	}
+	close(s);
+	*htype = me.sll_hatype;
+	return me.sll_halen;
+}
+
+static int parse_address(const char *dev, int hatype, int halen,
+		char *lla, struct ifreq *ifr)
+{
+	int alen;
+
+	memset(ifr, 0, sizeof(*ifr));
+	strlcpy(ifr->ifr_name, dev, IFNAMSIZ);
+	ifr->ifr_hwaddr.sa_family = hatype;
+	alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
+	if (alen < 0)
+		return -1;
+	if (alen != halen) {
+		fprintf(stderr,
+			"Wrong address (%s) length: expected %d bytes\n",
+			lla, halen);
+		return -1;
+	}
+	return 0;
+}
+
+static int set_address(struct ifreq *ifr, int brd)
+{
+	int s;
+
+	s = get_ctl_fd();
+	if (s < 0)
+		return -1;
+	if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
+		perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
+		close(s);
+		return -1;
+	}
+	close(s);
+	return 0;
+}
+
+static int do_set(int argc, char **argv)
+{
+	char *dev = NULL;
+	__u32 mask = 0;
+	__u32 flags = 0;
+	int qlen = -1;
+	int mtu = -1;
+	char *newaddr = NULL;
+	char *newbrd = NULL;
+	struct ifreq ifr0, ifr1;
+	char *newname = NULL;
+	int htype, halen;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "up") == 0) {
+			mask |= IFF_UP;
+			flags |= IFF_UP;
+		} else if (strcmp(*argv, "down") == 0) {
+			mask |= IFF_UP;
+			flags &= ~IFF_UP;
+		} else if (strcmp(*argv, "name") == 0) {
+			NEXT_ARG();
+			if (check_ifname(*argv))
+				invarg("\"name\" not a valid ifname", *argv);
+			newname = *argv;
+		} else if (matches(*argv, "address") == 0) {
+			NEXT_ARG();
+			newaddr = *argv;
+		} else if (matches(*argv, "broadcast") == 0 ||
+			   strcmp(*argv, "brd") == 0) {
+			NEXT_ARG();
+			newbrd = *argv;
+		} else if (matches(*argv, "txqueuelen") == 0 ||
+			   strcmp(*argv, "qlen") == 0 ||
+			   matches(*argv, "txqlen") == 0) {
+			NEXT_ARG();
+			if (qlen != -1)
+				duparg("txqueuelen", *argv);
+			if (get_integer(&qlen,  *argv, 0))
+				invarg("Invalid \"txqueuelen\" value\n", *argv);
+		} else if (strcmp(*argv, "mtu") == 0) {
+			NEXT_ARG();
+			if (mtu != -1)
+				duparg("mtu", *argv);
+			if (get_integer(&mtu, *argv, 0))
+				invarg("Invalid \"mtu\" value\n", *argv);
+		} else if (strcmp(*argv, "multicast") == 0) {
+			NEXT_ARG();
+			mask |= IFF_MULTICAST;
+
+			if (strcmp(*argv, "on") == 0)
+				flags |= IFF_MULTICAST;
+			else if (strcmp(*argv, "off") == 0)
+				flags &= ~IFF_MULTICAST;
+			else
+				return on_off("multicast", *argv);
+		} else if (strcmp(*argv, "allmulticast") == 0) {
+			NEXT_ARG();
+			mask |= IFF_ALLMULTI;
+
+			if (strcmp(*argv, "on") == 0)
+				flags |= IFF_ALLMULTI;
+			else if (strcmp(*argv, "off") == 0)
+				flags &= ~IFF_ALLMULTI;
+			else
+				return on_off("allmulticast", *argv);
+		} else if (strcmp(*argv, "promisc") == 0) {
+			NEXT_ARG();
+			mask |= IFF_PROMISC;
+
+			if (strcmp(*argv, "on") == 0)
+				flags |= IFF_PROMISC;
+			else if (strcmp(*argv, "off") == 0)
+				flags &= ~IFF_PROMISC;
+			else
+				return on_off("promisc", *argv);
+		} else if (strcmp(*argv, "trailers") == 0) {
+			NEXT_ARG();
+			mask |= IFF_NOTRAILERS;
+
+			if (strcmp(*argv, "off") == 0)
+				flags |= IFF_NOTRAILERS;
+			else if (strcmp(*argv, "on") == 0)
+				flags &= ~IFF_NOTRAILERS;
+			else
+				return on_off("trailers", *argv);
+		} else if (strcmp(*argv, "arp") == 0) {
+			NEXT_ARG();
+			mask |= IFF_NOARP;
+
+			if (strcmp(*argv, "on") == 0)
+				flags &= ~IFF_NOARP;
+			else if (strcmp(*argv, "off") == 0)
+				flags |= IFF_NOARP;
+			else
+				return on_off("arp", *argv);
+		} else if (matches(*argv, "dynamic") == 0) {
+			NEXT_ARG();
+			mask |= IFF_DYNAMIC;
+
+			if (strcmp(*argv, "on") == 0)
+				flags |= IFF_DYNAMIC;
+			else if (strcmp(*argv, "off") == 0)
+				flags &= ~IFF_DYNAMIC;
+			else
+				return on_off("dynamic", *argv);
+		} else {
+			if (strcmp(*argv, "dev") == 0)
+				NEXT_ARG();
+			else if (matches(*argv, "help") == 0)
+				usage();
+
+			if (dev)
+				duparg2("dev", *argv);
+			if (check_ifname(*argv))
+				invarg("\"dev\" not a valid ifname", *argv);
+			dev = *argv;
+		}
+		argc--; argv++;
+	}
+
+	if (!dev) {
+		fprintf(stderr,
+			"Not enough of information: \"dev\" argument is required.\n");
+		exit(-1);
+	}
+
+	if (newaddr || newbrd) {
+		halen = get_address(dev, &htype);
+		if (halen < 0)
+			return -1;
+		if (newaddr) {
+			if (parse_address(dev, htype, halen,
+					  newaddr, &ifr0) < 0)
+				return -1;
+		}
+		if (newbrd) {
+			if (parse_address(dev, htype, halen,
+					  newbrd, &ifr1) < 0)
+				return -1;
+		}
+	}
+
+	if (newname && strcmp(dev, newname)) {
+		if (do_changename(dev, newname) < 0)
+			return -1;
+		dev = newname;
+	}
+	if (qlen != -1) {
+		if (set_qlen(dev, qlen) < 0)
+			return -1;
+	}
+	if (mtu != -1) {
+		if (set_mtu(dev, mtu) < 0)
+			return -1;
+	}
+	if (newaddr || newbrd) {
+		if (newbrd) {
+			if (set_address(&ifr1, 1) < 0)
+				return -1;
+		}
+		if (newaddr) {
+			if (set_address(&ifr0, 0) < 0)
+				return -1;
+		}
+	}
+	if (mask)
+		return do_chflags(dev, flags, mask);
+	return 0;
+}
+#endif /* IPLINK_IOCTL_COMPAT */
+
+void print_mpls_link_stats(FILE *fp, const struct mpls_link_stats *stats,
+			   const char *indent)
+{
+	unsigned int cols[] = {
+		strlen("*X: bytes"),
+		strlen("packets"),
+		strlen("errors"),
+		strlen("dropped"),
+		strlen("noroute"),
+	};
+
+	if (is_json_context()) {
+		/* RX stats */
+		open_json_object("rx");
+		print_u64(PRINT_JSON, "bytes", NULL, stats->rx_bytes);
+		print_u64(PRINT_JSON, "packets", NULL, stats->rx_packets);
+		print_u64(PRINT_JSON, "errors", NULL, stats->rx_errors);
+		print_u64(PRINT_JSON, "dropped", NULL, stats->rx_dropped);
+		print_u64(PRINT_JSON, "noroute", NULL, stats->rx_noroute);
+		close_json_object();
+
+		/* TX stats */
+		open_json_object("tx");
+		print_u64(PRINT_JSON, "bytes", NULL, stats->tx_bytes);
+		print_u64(PRINT_JSON, "packets", NULL, stats->tx_packets);
+		print_u64(PRINT_JSON, "errors", NULL, stats->tx_errors);
+		print_u64(PRINT_JSON, "dropped", NULL, stats->tx_dropped);
+		close_json_object();
+	} else {
+		size_columns(cols, ARRAY_SIZE(cols), stats->rx_bytes,
+			     stats->rx_packets, stats->rx_errors,
+			     stats->rx_dropped, stats->rx_noroute);
+		size_columns(cols, ARRAY_SIZE(cols), stats->tx_bytes,
+			     stats->tx_packets, stats->tx_errors,
+			     stats->tx_dropped, 0);
+
+		fprintf(fp, "%sRX: %*s %*s %*s %*s %*s%s", indent,
+			cols[0] - 4, "bytes", cols[1], "packets",
+			cols[2], "errors", cols[3], "dropped",
+			cols[4], "noroute", _SL_);
+		fprintf(fp, "%s", indent);
+		print_num(fp, cols[0], stats->rx_bytes);
+		print_num(fp, cols[1], stats->rx_packets);
+		print_num(fp, cols[2], stats->rx_errors);
+		print_num(fp, cols[3], stats->rx_dropped);
+		print_num(fp, cols[4], stats->rx_noroute);
+		print_nl();
+
+		fprintf(fp, "%sTX: %*s %*s %*s %*s%s", indent,
+			cols[0] - 4, "bytes", cols[1], "packets",
+			cols[2], "errors", cols[3], "dropped", _SL_);
+		fprintf(fp, "%s", indent);
+		print_num(fp, cols[0], stats->tx_bytes);
+		print_num(fp, cols[1], stats->tx_packets);
+		print_num(fp, cols[2], stats->tx_errors);
+		print_num(fp, cols[3], stats->tx_dropped);
+	}
+}
+
+static void print_mpls_stats(FILE *fp, struct rtattr *attr)
+{
+	struct rtattr *mrtb[MPLS_STATS_MAX+1];
+	struct mpls_link_stats *stats;
+
+	parse_rtattr(mrtb, MPLS_STATS_MAX, RTA_DATA(attr),
+		     RTA_PAYLOAD(attr));
+	if (!mrtb[MPLS_STATS_LINK])
+		return;
+
+	stats = RTA_DATA(mrtb[MPLS_STATS_LINK]);
+	print_string(PRINT_FP, NULL, "    mpls:", NULL);
+	print_nl();
+	print_mpls_link_stats(fp, stats, "        ");
+	print_string(PRINT_FP, NULL, "%s", "\n");
+	fflush(fp);
+}
+
+static void print_af_stats_attr(FILE *fp, int ifindex, struct rtattr *attr)
+{
+	bool if_printed = false;
+	struct rtattr *i;
+	int rem;
+
+	rem = RTA_PAYLOAD(attr);
+	for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
+		if (preferred_family != AF_UNSPEC &&
+		    i->rta_type != preferred_family)
+			continue;
+
+		if (!if_printed) {
+			print_uint(PRINT_ANY, "ifindex",
+				   "%u:", ifindex);
+			print_color_string(PRINT_ANY, COLOR_IFNAME, 
+					   "ifname", "%s",
+					   ll_index_to_name(ifindex));
+			print_nl();
+			if_printed = true;
+		}
+
+		switch (i->rta_type) {
+		case AF_MPLS:
+			print_mpls_stats(fp, i);
+			break;
+		default:
+			fprintf(stderr, "    unknown af(%d)\n", i->rta_type);
+			break;
+		}
+	}
+}
+
+struct af_stats_ctx {
+	FILE *fp;
+	int ifindex;
+};
+
+static int print_af_stats(struct nlmsghdr *n, void *arg)
+{
+	struct if_stats_msg *ifsm = NLMSG_DATA(n);
+	struct rtattr *tb[IFLA_STATS_MAX+1];
+	int len = n->nlmsg_len;
+	struct af_stats_ctx *ctx = arg;
+	FILE *fp = ctx->fp;
+
+	len -= NLMSG_LENGTH(sizeof(*ifsm));
+	if (len < 0) {
+		fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
+		return -1;
+	}
+
+	if (ctx->ifindex && ifsm->ifindex != ctx->ifindex)
+		return 0;
+
+	parse_rtattr(tb, IFLA_STATS_MAX, IFLA_STATS_RTA(ifsm), len);
+
+	if (tb[IFLA_STATS_AF_SPEC])
+		print_af_stats_attr(fp, ifsm->ifindex, tb[IFLA_STATS_AF_SPEC]);
+
+	fflush(fp);
+	return 0;
+}
+
+static int iplink_afstats(int argc, char **argv)
+{
+	__u32 filt_mask = IFLA_STATS_FILTER_BIT(IFLA_STATS_AF_SPEC);
+	const char *filter_dev = NULL;
+	struct af_stats_ctx ctx = {
+		.fp = stdout,
+		.ifindex = 0,
+	};
+
+	while (argc > 0) {
+		if (strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			if (filter_dev)
+				duparg2("dev", *argv);
+			filter_dev = *argv;
+		} else if (matches(*argv, "help") == 0) {
+			usage();
+		} else {
+			fprintf(stderr,
+				"Command \"%s\" is unknown, try \"ip link help\".\n",
+				*argv);
+			exit(-1);
+		}
+
+		argv++; argc--;
+	}
+
+	if (filter_dev) {
+		ctx.ifindex = ll_name_to_index(filter_dev);
+		if (ctx.ifindex <= 0) {
+			fprintf(stderr,
+				"Device \"%s\" does not exist.\n",
+				filter_dev);
+			return -1;
+		}
+	}
+
+	new_json_obj(json);
+
+	if (rtnl_statsdump_req_filter(&rth, AF_UNSPEC, filt_mask,
+				      NULL, NULL) < 0) {
+		perror("Cannont send dump request");
+		return 1;
+	}
+
+	if (rtnl_dump_filter(&rth, print_af_stats, &ctx) < 0) {
+		fprintf(stderr, "Dump terminated\n");
+		return 1;
+	}
+
+	delete_json_obj();
+	return 0;
+}
+
+static int iplink_prop_mod(int argc, char **argv, struct iplink_req *req)
+{
+	struct rtattr *proplist;
+	char *dev = NULL;
+	char *name;
+
+	proplist = addattr_nest(&req->n, sizeof(*req),
+				IFLA_PROP_LIST | NLA_F_NESTED);
+
+	while (argc > 0) {
+		if (matches(*argv, "altname") == 0) {
+			NEXT_ARG();
+			if (check_altifname(*argv))
+				invarg("not a valid altname", *argv);
+			name = *argv;
+			addattr_l(&req->n, sizeof(*req), IFLA_ALT_IFNAME,
+				  name, strlen(name) + 1);
+		} else if (matches(*argv, "help") == 0) {
+			usage();
+		} else {
+			if (strcmp(*argv, "dev") == 0)
+				NEXT_ARG();
+			if (dev)
+				duparg2("dev", *argv);
+			if (check_altifname(*argv))
+				invarg("\"dev\" not a valid ifname", *argv);
+			dev = *argv;
+		}
+		argv++; argc--;
+	}
+	addattr_nest_end(&req->n, proplist);
+
+	if (!dev) {
+		fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
+		exit(-1);
+	}
+
+	req->i.ifi_index = ll_name_to_index(dev);
+	if (!req->i.ifi_index)
+		return nodev(dev);
+
+	if (rtnl_talk(&rth, &req->n, NULL) < 0)
+		return -2;
+
+	return 0;
+}
+
+static int iplink_prop(int argc, char **argv)
+{
+	struct iplink_req req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+		.n.nlmsg_flags = NLM_F_REQUEST,
+		.i.ifi_family = preferred_family,
+	};
+
+	if (argc <= 0) {
+		usage();
+		exit(-1);
+	}
+
+	if (matches(*argv, "add") == 0) {
+		req.n.nlmsg_flags |= NLM_F_EXCL | NLM_F_CREATE | NLM_F_APPEND;
+		req.n.nlmsg_type = RTM_NEWLINKPROP;
+	} else if (matches(*argv, "del") == 0) {
+		req.n.nlmsg_type = RTM_DELLINKPROP;
+	} else if (matches(*argv, "help") == 0) {
+		usage();
+	} else {
+		fprintf(stderr, "Operator required\n");
+		exit(-1);
+	}
+	return iplink_prop_mod(argc - 1, argv + 1, &req);
+}
+
+static void do_help(int argc, char **argv)
+{
+	struct link_util *lu = NULL;
+
+	if (argc <= 0) {
+		usage();
+		return;
+	}
+
+	lu = get_link_kind(*argv);
+	if (lu && lu->print_help)
+		lu->print_help(lu, argc-1, argv+1, stdout);
+	else
+		usage();
+}
+
+int do_iplink(int argc, char **argv)
+{
+	if (argc < 1)
+		return ipaddr_list_link(0, NULL);
+
+	if (iplink_have_newlink()) {
+		if (matches(*argv, "add") == 0)
+			return iplink_modify(RTM_NEWLINK,
+					     NLM_F_CREATE|NLM_F_EXCL,
+					     argc-1, argv+1);
+		if (matches(*argv, "set") == 0 ||
+		    matches(*argv, "change") == 0)
+			return iplink_modify(RTM_NEWLINK, 0,
+					     argc-1, argv+1);
+		if (matches(*argv, "replace") == 0)
+			return iplink_modify(RTM_NEWLINK,
+					     NLM_F_CREATE|NLM_F_REPLACE,
+					     argc-1, argv+1);
+		if (matches(*argv, "delete") == 0)
+			return iplink_modify(RTM_DELLINK, 0,
+					     argc-1, argv+1);
+	} else {
+#if IPLINK_IOCTL_COMPAT
+		if (matches(*argv, "set") == 0)
+			return do_set(argc-1, argv+1);
+#endif
+	}
+
+	if (matches(*argv, "show") == 0 ||
+	    matches(*argv, "lst") == 0 ||
+	    matches(*argv, "list") == 0)
+		return ipaddr_list_link(argc-1, argv+1);
+
+	if (matches(*argv, "xstats") == 0)
+		return iplink_ifla_xstats(argc-1, argv+1);
+
+	if (matches(*argv, "afstats") == 0) {
+		iplink_afstats(argc-1, argv+1);
+		return 0;
+	}
+
+	if (matches(*argv, "property") == 0)
+		return iplink_prop(argc-1, argv+1);
+
+	if (matches(*argv, "help") == 0) {
+		do_help(argc-1, argv+1);
+		return 0;
+	}
+
+	fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n",
+		*argv);
+	exit(-1);
+}