Adding upstream version 6.1.0.upstream/6.1.0upstream

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

1 files changed, 2400 insertions, 0 deletions

diff --git a/ip/iproute.c b/ip/iproute.c
new file mode 100644
index 0000000..f34289e
--- /dev/null
+++ b/ip/iproute.c
@@ -0,0 +1,2400 @@
+/*
+ * iproute.c		"ip route".
+ *
+ *		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 <string.h>
+#include <time.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+#include <linux/in_route.h>
+#include <linux/icmpv6.h>
+#include <errno.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+#include "nh_common.h"
+
+#ifndef RTAX_RTTVAR
+#define RTAX_RTTVAR RTAX_HOPS
+#endif
+
+enum list_action {
+	IPROUTE_LIST,
+	IPROUTE_FLUSH,
+	IPROUTE_SAVE,
+};
+static const char *mx_names[RTAX_MAX+1] = {
+	[RTAX_MTU]			= "mtu",
+	[RTAX_WINDOW]			= "window",
+	[RTAX_RTT]			= "rtt",
+	[RTAX_RTTVAR]			= "rttvar",
+	[RTAX_SSTHRESH]			= "ssthresh",
+	[RTAX_CWND]			= "cwnd",
+	[RTAX_ADVMSS]			= "advmss",
+	[RTAX_REORDERING]		= "reordering",
+	[RTAX_HOPLIMIT]			= "hoplimit",
+	[RTAX_INITCWND]			= "initcwnd",
+	[RTAX_FEATURES]			= "features",
+	[RTAX_RTO_MIN]			= "rto_min",
+	[RTAX_INITRWND]			= "initrwnd",
+	[RTAX_QUICKACK]			= "quickack",
+	[RTAX_CC_ALGO]			= "congctl",
+	[RTAX_FASTOPEN_NO_COOKIE]	= "fastopen_no_cookie"
+};
+static void usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+	fprintf(stderr,
+		"Usage: ip route { list | flush } SELECTOR\n"
+		"       ip route save SELECTOR\n"
+		"       ip route restore\n"
+		"       ip route showdump\n"
+		"       ip route get [ ROUTE_GET_FLAGS ] ADDRESS\n"
+		"                            [ from ADDRESS iif STRING ]\n"
+		"                            [ oif STRING ] [ tos TOS ]\n"
+		"                            [ mark NUMBER ] [ vrf NAME ]\n"
+		"                            [ uid NUMBER ] [ ipproto PROTOCOL ]\n"
+		"                            [ sport NUMBER ] [ dport NUMBER ]\n"
+		"       ip route { add | del | change | append | replace } ROUTE\n"
+		"SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n"
+		"            [ table TABLE_ID ] [ vrf NAME ] [ proto RTPROTO ]\n"
+		"            [ type TYPE ] [ scope SCOPE ]\n"
+		"ROUTE := NODE_SPEC [ INFO_SPEC ]\n"
+		"NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n"
+		"             [ table TABLE_ID ] [ proto RTPROTO ]\n"
+		"             [ scope SCOPE ] [ metric METRIC ]\n"
+		"             [ ttl-propagate { enabled | disabled } ]\n"
+		"INFO_SPEC := { NH | nhid ID } OPTIONS FLAGS [ nexthop NH ]...\n"
+		"NH := [ encap ENCAPTYPE ENCAPHDR ] [ via [ FAMILY ] ADDRESS ]\n"
+		"      [ dev STRING ] [ weight NUMBER ] NHFLAGS\n"
+		"FAMILY := [ inet | inet6 | mpls | bridge | link ]\n"
+		"OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ] [ as [ to ] ADDRESS ]\n"
+		"           [ rtt TIME ] [ rttvar TIME ] [ reordering NUMBER ]\n"
+		"           [ window NUMBER ] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n"
+		"           [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n"
+		"           [ rto_min TIME ] [ hoplimit NUMBER ] [ initrwnd NUMBER ]\n"
+		"           [ features FEATURES ] [ quickack BOOL ] [ congctl NAME ]\n"
+		"           [ pref PREF ] [ expires TIME ] [ fastopen_no_cookie BOOL ]\n"
+		"TYPE := { unicast | local | broadcast | multicast | throw |\n"
+		"          unreachable | prohibit | blackhole | nat }\n"
+		"TABLE_ID := [ local | main | default | all | NUMBER ]\n"
+		"SCOPE := [ host | link | global | NUMBER ]\n"
+		"NHFLAGS := [ onlink | pervasive ]\n"
+		"RTPROTO := [ kernel | boot | static | NUMBER ]\n"
+		"PREF := [ low | medium | high ]\n"
+		"TIME := NUMBER[s|ms]\n"
+		"BOOL := [1|0]\n"
+		"FEATURES := ecn\n"
+		"ENCAPTYPE := [ mpls | ip | ip6 | seg6 | seg6local | rpl | ioam6 | xfrm ]\n"
+		"ENCAPHDR := [ MPLSLABEL | SEG6HDR | SEG6LOCAL | IOAM6HDR | XFRMINFO ]\n"
+		"SEG6HDR := [ mode SEGMODE ] segs ADDR1,ADDRi,ADDRn [hmac HMACKEYID] [cleanup]\n"
+		"SEGMODE := [ encap | encap.red | inline | l2encap | l2encap.red ]\n"
+		"SEG6LOCAL := action ACTION [ OPTIONS ] [ count ]\n"
+		"ACTION := { End | End.X | End.T | End.DX2 | End.DX6 | End.DX4 |\n"
+		"            End.DT6 | End.DT4 | End.DT46 | End.B6 | End.B6.Encaps |\n"
+		"            End.BM | End.S | End.AS | End.AM | End.BPF }\n"
+		"OPTIONS := OPTION [ OPTIONS ]\n"
+		"OPTION := { flavors FLAVORS | srh SEG6HDR | nh4 ADDR | nh6 ADDR | iif DEV | oif DEV |\n"
+		"            table TABLEID | vrftable TABLEID | endpoint PROGNAME }\n"
+		"FLAVORS := { FLAVOR[,FLAVOR] }\n"
+		"FLAVOR := { psp | usp | usd | next-csid }\n"
+		"IOAM6HDR := trace prealloc type IOAM6_TRACE_TYPE ns IOAM6_NAMESPACE size IOAM6_TRACE_SIZE\n"
+		"XFRMINFO := if_id IF_ID [ link_dev LINK ]\n"
+		"ROUTE_GET_FLAGS := [ fibmatch ]\n");
+	exit(-1);
+}
+
+
+static struct
+{
+	unsigned int tb;
+	int cloned;
+	int flushed;
+	char *flushb;
+	int flushp;
+	int flushe;
+	int protocol, protocolmask;
+	int scope, scopemask;
+	__u64 typemask;
+	int tos, tosmask;
+	int iif, iifmask;
+	int oif, oifmask;
+	int mark, markmask;
+	int realm, realmmask;
+	__u32 metric, metricmask;
+	inet_prefix rprefsrc;
+	inet_prefix rvia;
+	inet_prefix rdst;
+	inet_prefix mdst;
+	inet_prefix rsrc;
+	inet_prefix msrc;
+} filter;
+
+static int flush_update(void)
+{
+	if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
+		perror("Failed to send flush request");
+		return -2;
+	}
+	filter.flushp = 0;
+	return 0;
+}
+
+static int filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
+{
+	struct rtmsg *r = NLMSG_DATA(n);
+	inet_prefix dst = { .family = r->rtm_family };
+	inet_prefix src = { .family = r->rtm_family };
+	inet_prefix via = { .family = r->rtm_family };
+	inet_prefix prefsrc = { .family = r->rtm_family };
+	__u32 table;
+	static int ip6_multiple_tables;
+
+	table = rtm_get_table(r, tb);
+
+	if (preferred_family != AF_UNSPEC && r->rtm_family != preferred_family)
+		return 0;
+
+	if (r->rtm_family == AF_INET6 && table != RT_TABLE_MAIN)
+		ip6_multiple_tables = 1;
+
+	if (filter.cloned == !(r->rtm_flags & RTM_F_CLONED))
+		return 0;
+
+	if (r->rtm_family == AF_INET6 && !ip6_multiple_tables) {
+		if (filter.tb) {
+			if (filter.tb == RT_TABLE_LOCAL) {
+				if (r->rtm_type != RTN_LOCAL)
+					return 0;
+			} else if (filter.tb == RT_TABLE_MAIN) {
+				if (r->rtm_type == RTN_LOCAL)
+					return 0;
+			} else {
+				return 0;
+			}
+		}
+	} else {
+		if (filter.tb > 0 && filter.tb != table)
+			return 0;
+	}
+	if ((filter.protocol^r->rtm_protocol)&filter.protocolmask)
+		return 0;
+	if ((filter.scope^r->rtm_scope)&filter.scopemask)
+		return 0;
+
+	if (filter.typemask && !(filter.typemask & (1 << r->rtm_type)))
+		return 0;
+	if ((filter.tos^r->rtm_tos)&filter.tosmask)
+		return 0;
+	if (filter.rdst.family) {
+		if (r->rtm_family != filter.rdst.family ||
+		    filter.rdst.bitlen > r->rtm_dst_len)
+			return 0;
+	} else if (filter.rdst.flags & PREFIXLEN_SPECIFIED) {
+		if (filter.rdst.bitlen > r->rtm_dst_len)
+			return 0;
+	}
+	if (filter.mdst.family) {
+		if (r->rtm_family != filter.mdst.family ||
+		    (filter.mdst.bitlen >= 0 &&
+		     filter.mdst.bitlen < r->rtm_dst_len))
+			return 0;
+	} else if (filter.mdst.flags & PREFIXLEN_SPECIFIED) {
+		if (filter.mdst.bitlen >= 0 &&
+		    filter.mdst.bitlen < r->rtm_dst_len)
+			return 0;
+	}
+	if (filter.rsrc.family) {
+		if (r->rtm_family != filter.rsrc.family ||
+		    filter.rsrc.bitlen > r->rtm_src_len)
+			return 0;
+	} else if (filter.rsrc.flags & PREFIXLEN_SPECIFIED) {
+		if (filter.rsrc.bitlen > r->rtm_src_len)
+			return 0;
+	}
+	if (filter.msrc.family) {
+		if (r->rtm_family != filter.msrc.family ||
+		    (filter.msrc.bitlen >= 0 &&
+		     filter.msrc.bitlen < r->rtm_src_len))
+			return 0;
+	} else if (filter.msrc.flags & PREFIXLEN_SPECIFIED) {
+		if (filter.msrc.bitlen >= 0 &&
+		    filter.msrc.bitlen < r->rtm_src_len)
+			return 0;
+	}
+	if (filter.rvia.family) {
+		int family = r->rtm_family;
+
+		if (tb[RTA_VIA]) {
+			struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
+
+			family = via->rtvia_family;
+		}
+		if (family != filter.rvia.family)
+			return 0;
+	}
+	if (filter.rprefsrc.family && r->rtm_family != filter.rprefsrc.family)
+		return 0;
+
+	if (tb[RTA_DST])
+		memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), (r->rtm_dst_len+7)/8);
+	if (filter.rsrc.family || filter.msrc.family ||
+	    filter.rsrc.flags & PREFIXLEN_SPECIFIED ||
+	    filter.msrc.flags & PREFIXLEN_SPECIFIED) {
+		if (tb[RTA_SRC])
+			memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), (r->rtm_src_len+7)/8);
+	}
+	if (filter.rvia.bitlen > 0) {
+		if (tb[RTA_GATEWAY])
+			memcpy(&via.data, RTA_DATA(tb[RTA_GATEWAY]), host_len/8);
+		if (tb[RTA_VIA]) {
+			size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
+			struct rtvia *rtvia = RTA_DATA(tb[RTA_VIA]);
+
+			via.family = rtvia->rtvia_family;
+			memcpy(&via.data, rtvia->rtvia_addr, len);
+		}
+	}
+	if (filter.rprefsrc.bitlen > 0) {
+		if (tb[RTA_PREFSRC])
+			memcpy(&prefsrc.data, RTA_DATA(tb[RTA_PREFSRC]), host_len/8);
+	}
+
+	if ((filter.rdst.family || filter.rdst.flags & PREFIXLEN_SPECIFIED) &&
+	    inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
+		return 0;
+	if ((filter.mdst.family || filter.mdst.flags & PREFIXLEN_SPECIFIED) &&
+	    inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
+		return 0;
+
+	if ((filter.rsrc.family || filter.rsrc.flags & PREFIXLEN_SPECIFIED) &&
+	    inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
+		return 0;
+	if ((filter.msrc.family || filter.msrc.flags & PREFIXLEN_SPECIFIED) &&
+	    filter.msrc.bitlen >= 0 &&
+	    inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
+		return 0;
+
+	if (filter.rvia.family && inet_addr_match(&via, &filter.rvia, filter.rvia.bitlen))
+		return 0;
+	if (filter.rprefsrc.family && inet_addr_match(&prefsrc, &filter.rprefsrc, filter.rprefsrc.bitlen))
+		return 0;
+	if (filter.realmmask) {
+		__u32 realms = 0;
+
+		if (tb[RTA_FLOW])
+			realms = rta_getattr_u32(tb[RTA_FLOW]);
+		if ((realms^filter.realm)&filter.realmmask)
+			return 0;
+	}
+	if (filter.iifmask) {
+		int iif = 0;
+
+		if (tb[RTA_IIF])
+			iif = rta_getattr_u32(tb[RTA_IIF]);
+		if ((iif^filter.iif)&filter.iifmask)
+			return 0;
+	}
+	if (filter.oifmask) {
+		int oif = 0;
+
+		if (tb[RTA_OIF])
+			oif = rta_getattr_u32(tb[RTA_OIF]);
+		if ((oif^filter.oif)&filter.oifmask)
+			return 0;
+	}
+	if (filter.markmask) {
+		int mark = 0;
+
+		if (tb[RTA_MARK])
+			mark = rta_getattr_u32(tb[RTA_MARK]);
+		if ((mark ^ filter.mark) & filter.markmask)
+			return 0;
+	}
+	if (filter.metricmask) {
+		__u32 metric = 0;
+
+		if (tb[RTA_PRIORITY])
+			metric = rta_getattr_u32(tb[RTA_PRIORITY]);
+		if ((metric ^ filter.metric) & filter.metricmask)
+			return 0;
+	}
+	if (filter.flushb &&
+	    r->rtm_family == AF_INET6 &&
+	    r->rtm_dst_len == 0 &&
+	    r->rtm_type == RTN_UNREACHABLE &&
+	    tb[RTA_PRIORITY] &&
+	    rta_getattr_u32(tb[RTA_PRIORITY]) == -1)
+		return 0;
+
+	return 1;
+}
+
+static void print_rtax_features(FILE *fp, unsigned int features)
+{
+	unsigned int of = features;
+
+	if (features & RTAX_FEATURE_ECN) {
+		print_null(PRINT_ANY, "ecn", "ecn ", NULL);
+		features &= ~RTAX_FEATURE_ECN;
+	}
+
+	if (features)
+		print_0xhex(PRINT_ANY,
+			    "features", "%#llx ", of);
+}
+
+void print_rt_flags(FILE *fp, unsigned int flags)
+{
+	open_json_array(PRINT_JSON,
+			is_json_context() ?  "flags" : "");
+
+	if (flags & RTNH_F_DEAD)
+		print_string(PRINT_ANY, NULL, "%s ", "dead");
+	if (flags & RTNH_F_ONLINK)
+		print_string(PRINT_ANY, NULL, "%s ", "onlink");
+	if (flags & RTNH_F_PERVASIVE)
+		print_string(PRINT_ANY, NULL, "%s ", "pervasive");
+	if (flags & RTNH_F_OFFLOAD)
+		print_string(PRINT_ANY, NULL, "%s ", "offload");
+	if (flags & RTNH_F_TRAP)
+		print_string(PRINT_ANY, NULL, "%s ", "trap");
+	if (flags & RTM_F_NOTIFY)
+		print_string(PRINT_ANY, NULL, "%s ", "notify");
+	if (flags & RTNH_F_LINKDOWN)
+		print_string(PRINT_ANY, NULL, "%s ", "linkdown");
+	if (flags & RTNH_F_UNRESOLVED)
+		print_string(PRINT_ANY, NULL, "%s ", "unresolved");
+	if (flags & RTM_F_OFFLOAD)
+		print_string(PRINT_ANY, NULL, "%s ", "rt_offload");
+	if (flags & RTM_F_TRAP)
+		print_string(PRINT_ANY, NULL, "%s ", "rt_trap");
+	if (flags & RTM_F_OFFLOAD_FAILED)
+		print_string(PRINT_ANY, NULL, "%s ", "rt_offload_failed");
+
+	close_json_array(PRINT_JSON, NULL);
+}
+
+static void print_rt_pref(FILE *fp, unsigned int pref)
+{
+
+	switch (pref) {
+	case ICMPV6_ROUTER_PREF_LOW:
+		print_string(PRINT_ANY,
+			     "pref", "pref %s", "low");
+		break;
+	case ICMPV6_ROUTER_PREF_MEDIUM:
+		print_string(PRINT_ANY,
+			     "pref", "pref %s", "medium");
+		break;
+	case ICMPV6_ROUTER_PREF_HIGH:
+		print_string(PRINT_ANY,
+			     "pref", "pref %s", "high");
+		break;
+	default:
+		print_uint(PRINT_ANY,
+			   "pref", "%u", pref);
+	}
+}
+
+void print_rta_ifidx(FILE *fp, __u32 ifidx, const char *prefix)
+{
+	const char *ifname = ll_index_to_name(ifidx);
+
+	if (is_json_context()) {
+		print_string(PRINT_JSON, prefix, NULL, ifname);
+	} else {
+		fprintf(fp, "%s ", prefix);
+		color_fprintf(fp, COLOR_IFNAME, "%s ", ifname);
+	}
+}
+
+static void print_cache_flags(FILE *fp, __u32 flags)
+{
+	json_writer_t *jw = get_json_writer();
+	flags &= ~0xFFFF;
+
+	if (jw) {
+		jsonw_name(jw, "cache");
+		jsonw_start_array(jw);
+	} else {
+		fprintf(fp, "%s    cache ", _SL_);
+		if (flags == 0)
+			return;
+		putc('<', fp);
+	}
+
+#define PRTFL(fl, flname)						\
+	if (flags & RTCF_##fl) {					\
+		flags &= ~RTCF_##fl;					\
+		if (jw)							\
+			jsonw_string(jw, flname);			\
+		else							\
+			fprintf(fp, "%s%s", flname, flags ? "," : "> "); \
+	}
+
+	PRTFL(LOCAL, "local");
+	PRTFL(REJECT, "reject");
+	PRTFL(MULTICAST, "mc");
+	PRTFL(BROADCAST, "brd");
+	PRTFL(DNAT, "dst-nat");
+	PRTFL(SNAT, "src-nat");
+	PRTFL(MASQ, "masq");
+	PRTFL(DIRECTDST, "dst-direct");
+	PRTFL(DIRECTSRC, "src-direct");
+	PRTFL(REDIRECTED, "redirected");
+	PRTFL(DOREDIRECT, "redirect");
+	PRTFL(FAST, "fastroute");
+	PRTFL(NOTIFY, "notify");
+	PRTFL(TPROXY, "proxy");
+#undef PRTFL
+
+	if (flags)
+		print_hex(PRINT_ANY, "flags", "%x>", flags);
+
+	if (jw)
+		jsonw_end_array(jw);
+}
+
+static void print_rta_cacheinfo(FILE *fp, const struct rta_cacheinfo *ci)
+{
+	static int hz;
+
+	if (!hz)
+		hz = get_user_hz();
+
+	if (ci->rta_expires != 0)
+		print_int(PRINT_ANY, "expires",
+			   "expires %dsec ", ci->rta_expires/hz);
+	if (ci->rta_error != 0)
+		print_uint(PRINT_ANY, "error",
+			   "error %u ", ci->rta_error);
+
+	if (show_stats) {
+		if (ci->rta_clntref)
+			print_uint(PRINT_ANY, "users",
+				   "users %u ", ci->rta_clntref);
+		if (ci->rta_used != 0)
+			print_uint(PRINT_ANY, "used",
+				   "used %u ", ci->rta_used);
+		if (ci->rta_lastuse != 0)
+			print_uint(PRINT_ANY, "age",
+				   "age %usec ", ci->rta_lastuse/hz);
+	}
+	if (ci->rta_id)
+		print_0xhex(PRINT_ANY, "ipid",
+			    "ipid 0x%04llx ", ci->rta_id);
+	if (ci->rta_ts || ci->rta_tsage) {
+		print_0xhex(PRINT_ANY, "ts",
+			    "ts 0x%llx", ci->rta_ts);
+		print_uint(PRINT_ANY, "tsage",
+			   "tsage %usec ", ci->rta_tsage);
+	}
+}
+
+static void print_rta_flow(FILE *fp, const struct rtattr *rta)
+{
+	__u32 to = rta_getattr_u32(rta);
+	__u32 from = to >> 16;
+	SPRINT_BUF(b1);
+
+	to &= 0xFFFF;
+	if (is_json_context()) {
+		open_json_object("flow");
+
+		if (from)
+			print_string(PRINT_JSON, "from", NULL,
+				     rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
+		print_string(PRINT_JSON, "to", NULL,
+			     rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
+		close_json_object();
+	} else {
+		fprintf(fp, "realm%s ", from ? "s" : "");
+
+		if (from)
+			print_string(PRINT_FP, NULL, "%s/",
+				     rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
+		print_string(PRINT_FP, NULL, "%s ",
+			     rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
+	}
+}
+
+static void print_rta_newdst(FILE *fp, const struct rtmsg *r,
+			     const struct rtattr *rta)
+{
+	const char *newdst = format_host_rta(r->rtm_family, rta);
+
+	if (is_json_context())
+		print_string(PRINT_JSON, "to", NULL, newdst);
+	else {
+		fprintf(fp, "as to ");
+		print_color_string(PRINT_FP,
+				   ifa_family_color(r->rtm_family),
+				   NULL, "%s ", newdst);
+	}
+}
+
+void __print_rta_gateway(FILE *fp, unsigned char family, const char *gateway)
+{
+	if (is_json_context()) {
+		print_string(PRINT_JSON, "gateway", NULL, gateway);
+	} else {
+		fprintf(fp, "via ");
+		print_color_string(PRINT_FP,
+				   ifa_family_color(family),
+				   NULL, "%s ", gateway);
+	}
+}
+
+void print_rta_gateway(FILE *fp, unsigned char family, const struct rtattr *rta)
+{
+	const char *gateway = format_host_rta(family, rta);
+
+	__print_rta_gateway(fp, family, gateway);
+}
+
+static void print_rta_via(FILE *fp, const struct rtattr *rta)
+{
+	size_t len = RTA_PAYLOAD(rta) - 2;
+	const struct rtvia *via = RTA_DATA(rta);
+
+	if (is_json_context()) {
+		open_json_object("via");
+		print_string(PRINT_JSON, "family", NULL,
+			     family_name(via->rtvia_family));
+		print_string(PRINT_JSON, "host", NULL,
+			     format_host(via->rtvia_family, len,
+					 via->rtvia_addr));
+		close_json_object();
+	} else {
+		print_string(PRINT_FP, NULL, "via %s ",
+			     family_name(via->rtvia_family));
+		print_color_string(PRINT_FP,
+				   ifa_family_color(via->rtvia_family),
+				   NULL, "%s ",
+				   format_host(via->rtvia_family,
+					       len, via->rtvia_addr));
+	}
+}
+
+static void print_rta_metrics(FILE *fp, const struct rtattr *rta)
+{
+	struct rtattr *mxrta[RTAX_MAX+1];
+	unsigned int mxlock = 0;
+	int i;
+
+	open_json_array(PRINT_JSON, "metrics");
+	open_json_object(NULL);
+
+	parse_rtattr(mxrta, RTAX_MAX, RTA_DATA(rta), RTA_PAYLOAD(rta));
+
+	if (mxrta[RTAX_LOCK])
+		mxlock = rta_getattr_u32(mxrta[RTAX_LOCK]);
+
+	for (i = 2; i <= RTAX_MAX; i++) {
+		__u32 val = 0U;
+
+		if (mxrta[i] == NULL && !(mxlock & (1 << i)))
+			continue;
+
+		if (mxrta[i] != NULL && i != RTAX_CC_ALGO)
+			val = rta_getattr_u32(mxrta[i]);
+
+		if (i == RTAX_HOPLIMIT && (int)val == -1)
+			continue;
+
+		if (!is_json_context()) {
+			if (i < sizeof(mx_names)/sizeof(char *) && mx_names[i])
+				fprintf(fp, "%s ", mx_names[i]);
+			else
+				fprintf(fp, "metric %d ", i);
+
+			if (mxlock & (1<<i))
+				fprintf(fp, "lock ");
+		}
+
+		switch (i) {
+		case RTAX_FEATURES:
+			print_rtax_features(fp, val);
+			break;
+		default:
+			print_uint(PRINT_ANY, mx_names[i], "%u ", val);
+			break;
+
+		case RTAX_RTT:
+		case RTAX_RTTVAR:
+		case RTAX_RTO_MIN:
+			if (i == RTAX_RTT)
+				val /= 8;
+			else if (i == RTAX_RTTVAR)
+				val /= 4;
+
+			if (is_json_context())
+				print_uint(PRINT_JSON, mx_names[i],
+					   NULL, val);
+			else {
+				if (val >= 1000)
+					fprintf(fp, "%gs ", val/1e3);
+				else
+					fprintf(fp, "%ums ", val);
+			}
+			break;
+		case RTAX_CC_ALGO:
+			print_string(PRINT_ANY, "congestion",
+				     "%s ", rta_getattr_str(mxrta[i]));
+			break;
+		}
+	}
+
+	close_json_object();
+	close_json_array(PRINT_JSON, NULL);
+}
+
+static void print_rta_multipath(FILE *fp, const struct rtmsg *r,
+				struct rtattr *rta)
+{
+	const struct rtnexthop *nh = RTA_DATA(rta);
+	int len = RTA_PAYLOAD(rta);
+	int first = 1;
+
+	open_json_array(PRINT_JSON, "nexthops");
+
+	while (len >= sizeof(*nh)) {
+		struct rtattr *tb[RTA_MAX + 1];
+
+		if (nh->rtnh_len > len)
+			break;
+
+		open_json_object(NULL);
+
+		if ((r->rtm_flags & RTM_F_CLONED) &&
+		    r->rtm_type == RTN_MULTICAST) {
+			if (first) {
+				print_string(PRINT_FP, NULL, "Oifs: ", NULL);
+				first = 0;
+			} else {
+				print_string(PRINT_FP, NULL, " ", NULL);
+			}
+		} else
+			print_string(PRINT_FP, NULL, "%s\tnexthop ", _SL_);
+
+		if (nh->rtnh_len > sizeof(*nh)) {
+			parse_rtattr(tb, RTA_MAX, RTNH_DATA(nh),
+				     nh->rtnh_len - sizeof(*nh));
+
+			if (tb[RTA_ENCAP])
+				lwt_print_encap(fp,
+						tb[RTA_ENCAP_TYPE],
+						tb[RTA_ENCAP]);
+			if (tb[RTA_NEWDST])
+				print_rta_newdst(fp, r, tb[RTA_NEWDST]);
+			if (tb[RTA_GATEWAY])
+				print_rta_gateway(fp, r->rtm_family,
+						  tb[RTA_GATEWAY]);
+			if (tb[RTA_VIA])
+				print_rta_via(fp, tb[RTA_VIA]);
+			if (tb[RTA_FLOW])
+				print_rta_flow(fp, tb[RTA_FLOW]);
+		}
+
+		if ((r->rtm_flags & RTM_F_CLONED) &&
+		    r->rtm_type == RTN_MULTICAST) {
+			print_string(PRINT_ANY, "dev",
+				     "%s", ll_index_to_name(nh->rtnh_ifindex));
+
+			if (nh->rtnh_hops != 1)
+				print_int(PRINT_ANY, "ttl", "(ttl>%d)", nh->rtnh_hops);
+
+			print_string(PRINT_FP, NULL, " ", NULL);
+		} else {
+			print_string(PRINT_ANY, "dev",
+				     "dev %s ", ll_index_to_name(nh->rtnh_ifindex));
+
+			if (r->rtm_family != AF_MPLS)
+				print_int(PRINT_ANY, "weight",
+					  "weight %d ", nh->rtnh_hops + 1);
+		}
+
+		print_rt_flags(fp, nh->rtnh_flags);
+
+		len -= NLMSG_ALIGN(nh->rtnh_len);
+		nh = RTNH_NEXT(nh);
+
+		close_json_object();
+	}
+	close_json_array(PRINT_JSON, NULL);
+}
+
+int print_route(struct nlmsghdr *n, void *arg)
+{
+	FILE *fp = (FILE *)arg;
+	struct rtmsg *r = NLMSG_DATA(n);
+	int len = n->nlmsg_len;
+	struct rtattr *tb[RTA_MAX+1];
+	int family, color, host_len;
+	__u32 table;
+	int ret;
+
+	SPRINT_BUF(b1);
+
+	if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
+		fprintf(stderr, "Not a route: %08x %08x %08x\n",
+			n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
+		return -1;
+	}
+	if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
+		return 0;
+	len -= NLMSG_LENGTH(sizeof(*r));
+	if (len < 0) {
+		fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
+		return -1;
+	}
+
+	host_len = af_bit_len(r->rtm_family);
+
+	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
+	table = rtm_get_table(r, tb);
+
+	if (!filter_nlmsg(n, tb, host_len))
+		return 0;
+
+	if (filter.flushb) {
+		struct nlmsghdr *fn;
+
+		if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
+			ret = flush_update();
+			if (ret < 0)
+				return ret;
+		}
+		fn = (struct nlmsghdr *)(filter.flushb + NLMSG_ALIGN(filter.flushp));
+		memcpy(fn, n, n->nlmsg_len);
+		fn->nlmsg_type = RTM_DELROUTE;
+		fn->nlmsg_flags = NLM_F_REQUEST;
+		fn->nlmsg_seq = ++rth.seq;
+		filter.flushp = (((char *)fn) + n->nlmsg_len) - filter.flushb;
+		filter.flushed++;
+		if (show_stats < 2)
+			return 0;
+	}
+
+	open_json_object(NULL);
+	if (n->nlmsg_type == RTM_DELROUTE)
+		print_bool(PRINT_ANY, "deleted", "Deleted ", true);
+
+	if ((r->rtm_type != RTN_UNICAST || show_details > 0) &&
+	    (!filter.typemask || (filter.typemask & (1 << r->rtm_type))))
+		print_string(PRINT_ANY, "type", "%s ",
+			     rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
+
+	color = COLOR_NONE;
+	if (tb[RTA_DST]) {
+		family = get_real_family(r->rtm_type, r->rtm_family);
+		color = ifa_family_color(family);
+
+		if (r->rtm_dst_len != host_len) {
+			snprintf(b1, sizeof(b1),
+				 "%s/%u", rt_addr_n2a_rta(family, tb[RTA_DST]),
+				 r->rtm_dst_len);
+		} else {
+			const char *hostname = format_host_rta_r(family, tb[RTA_DST],
+					  b1, sizeof(b1));
+			if (hostname)
+				strncpy(b1, hostname, sizeof(b1) - 1);
+		}
+	} else if (r->rtm_dst_len) {
+		snprintf(b1, sizeof(b1), "0/%d ", r->rtm_dst_len);
+	} else {
+		strncpy(b1, "default", sizeof(b1));
+	}
+	print_color_string(PRINT_ANY, color,
+			   "dst", "%s ", b1);
+
+	if (tb[RTA_SRC]) {
+		family = get_real_family(r->rtm_type, r->rtm_family);
+		color = ifa_family_color(family);
+
+		if (r->rtm_src_len != host_len) {
+			snprintf(b1, sizeof(b1),
+				 "%s/%u",
+				 rt_addr_n2a_rta(family, tb[RTA_SRC]),
+				 r->rtm_src_len);
+		} else {
+			const char *hostname = format_host_rta_r(family, tb[RTA_SRC],
+					  b1, sizeof(b1));
+			if (hostname)
+				strncpy(b1, hostname, sizeof(b1) - 1);
+		}
+		print_color_string(PRINT_ANY, color,
+				   "from", "from %s ", b1);
+	} else if (r->rtm_src_len) {
+		snprintf(b1, sizeof(b1), "0/%u", r->rtm_src_len);
+
+		print_string(PRINT_ANY, "src", "from %s ", b1);
+	}
+
+	if (tb[RTA_NH_ID])
+		print_uint(PRINT_ANY, "nhid", "nhid %u ",
+			   rta_getattr_u32(tb[RTA_NH_ID]));
+
+	if (tb[RTA_NEWDST])
+		print_rta_newdst(fp, r, tb[RTA_NEWDST]);
+
+	if (tb[RTA_ENCAP])
+		lwt_print_encap(fp, tb[RTA_ENCAP_TYPE], tb[RTA_ENCAP]);
+
+	if (r->rtm_tos && filter.tosmask != -1) {
+		print_string(PRINT_ANY, "tos", "tos %s ",
+			     rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
+	}
+
+	if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len)
+		print_rta_gateway(fp, r->rtm_family, tb[RTA_GATEWAY]);
+
+	if (tb[RTA_VIA])
+		print_rta_via(fp, tb[RTA_VIA]);
+
+	if (tb[RTA_OIF] && filter.oifmask != -1)
+		print_rta_ifidx(fp, rta_getattr_u32(tb[RTA_OIF]), "dev");
+
+	if (table && (table != RT_TABLE_MAIN || show_details > 0) && !filter.tb)
+		print_string(PRINT_ANY,
+			     "table", "table %s ",
+			     rtnl_rttable_n2a(table, b1, sizeof(b1)));
+
+	if (!(r->rtm_flags & RTM_F_CLONED)) {
+		if ((r->rtm_protocol != RTPROT_BOOT || show_details > 0) &&
+		    filter.protocolmask != -1)
+			print_string(PRINT_ANY,
+				     "protocol", "proto %s ",
+				     rtnl_rtprot_n2a(r->rtm_protocol,
+						     b1, sizeof(b1)));
+
+		if ((r->rtm_scope != RT_SCOPE_UNIVERSE || show_details > 0) &&
+		    filter.scopemask != -1)
+			print_string(PRINT_ANY,
+				     "scope", "scope %s ",
+				     rtnl_rtscope_n2a(r->rtm_scope,
+						      b1, sizeof(b1)));
+	}
+
+	if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
+		const char *psrc
+			= rt_addr_n2a_rta(r->rtm_family, tb[RTA_PREFSRC]);
+
+		/* Do not use format_host(). It is our local addr
+		   and symbolic name will not be useful.
+		*/
+		if (is_json_context())
+			print_string(PRINT_JSON, "prefsrc", NULL, psrc);
+		else {
+			fprintf(fp, "src ");
+			print_color_string(PRINT_FP,
+					   ifa_family_color(r->rtm_family),
+					   NULL, "%s ", psrc);
+		}
+
+	}
+
+	if (tb[RTA_PRIORITY] && filter.metricmask != -1)
+		print_uint(PRINT_ANY, "metric", "metric %u ",
+			   rta_getattr_u32(tb[RTA_PRIORITY]));
+
+	print_rt_flags(fp, r->rtm_flags);
+
+	if (tb[RTA_MARK]) {
+		unsigned int mark = rta_getattr_u32(tb[RTA_MARK]);
+
+		if (mark) {
+			if (is_json_context())
+				print_uint(PRINT_JSON, "mark", NULL, mark);
+			else if (mark >= 16)
+				print_0xhex(PRINT_FP, NULL,
+					    "mark 0x%llx ", mark);
+			else
+				print_uint(PRINT_FP, NULL,
+					   "mark %u ", mark);
+		}
+	}
+
+	if (tb[RTA_FLOW] && filter.realmmask != ~0U)
+		print_rta_flow(fp, tb[RTA_FLOW]);
+
+	if (tb[RTA_UID])
+		print_uint(PRINT_ANY, "uid", "uid %u ",
+			   rta_getattr_u32(tb[RTA_UID]));
+
+	if (r->rtm_family == AF_INET) {
+		if (r->rtm_flags & RTM_F_CLONED)
+			print_cache_flags(fp, r->rtm_flags);
+
+		if (tb[RTA_CACHEINFO])
+			print_rta_cacheinfo(fp, RTA_DATA(tb[RTA_CACHEINFO]));
+	} else if (r->rtm_family == AF_INET6) {
+		if (tb[RTA_CACHEINFO])
+			print_rta_cacheinfo(fp, RTA_DATA(tb[RTA_CACHEINFO]));
+	}
+
+	if (tb[RTA_METRICS])
+		print_rta_metrics(fp, tb[RTA_METRICS]);
+
+	if (tb[RTA_IIF] && filter.iifmask != -1)
+		print_rta_ifidx(fp, rta_getattr_u32(tb[RTA_IIF]), "iif");
+
+	if (tb[RTA_PREF])
+		print_rt_pref(fp, rta_getattr_u8(tb[RTA_PREF]));
+
+	if (tb[RTA_TTL_PROPAGATE]) {
+		bool propagate = rta_getattr_u8(tb[RTA_TTL_PROPAGATE]);
+
+		if (is_json_context())
+			print_bool(PRINT_JSON, "ttl-propogate", NULL,
+				   propagate);
+		else
+			print_string(PRINT_FP, NULL,
+				     "ttl-propogate %s",
+				     propagate ? "enabled" : "disabled");
+	}
+
+	if (tb[RTA_NH_ID] && show_details)
+		print_cache_nexthop_id(fp, "\n\tnh_info ", "nh_info",
+				       rta_getattr_u32(tb[RTA_NH_ID]));
+
+	if (tb[RTA_MULTIPATH])
+		print_rta_multipath(fp, r, tb[RTA_MULTIPATH]);
+
+	/* If you are adding new route RTA_XXXX then place it above
+	 * the RTA_MULTIPATH else it will appear that the last nexthop
+	 * in the ECMP has new attributes
+	 */
+
+	print_string(PRINT_FP, NULL, "\n", NULL);
+	close_json_object();
+	fflush(fp);
+	return 0;
+}
+
+static int parse_one_nh(struct nlmsghdr *n, struct rtmsg *r,
+			struct rtattr *rta, size_t len, struct rtnexthop *rtnh,
+			int *argcp, char ***argvp)
+{
+	int argc = *argcp;
+	char **argv = *argvp;
+
+	while (++argv, --argc > 0) {
+		if (strcmp(*argv, "via") == 0) {
+			inet_prefix addr;
+			int family;
+
+			NEXT_ARG();
+			family = read_family(*argv);
+			if (family == AF_UNSPEC)
+				family = r->rtm_family;
+			else
+				NEXT_ARG();
+			get_addr(&addr, *argv, family);
+			if (r->rtm_family == AF_UNSPEC)
+				r->rtm_family = addr.family;
+			if (addr.family == r->rtm_family) {
+				if (rta_addattr_l(rta, len, RTA_GATEWAY,
+						  &addr.data, addr.bytelen))
+					return -1;
+				rtnh->rtnh_len += sizeof(struct rtattr)
+						  + addr.bytelen;
+			} else {
+				if (rta_addattr_l(rta, len, RTA_VIA,
+						  &addr.family, addr.bytelen + 2))
+					return -1;
+				rtnh->rtnh_len += RTA_SPACE(addr.bytelen + 2);
+			}
+		} else if (strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			rtnh->rtnh_ifindex = ll_name_to_index(*argv);
+			if (!rtnh->rtnh_ifindex)
+				return nodev(*argv);
+		} else if (strcmp(*argv, "weight") == 0) {
+			unsigned int w;
+
+			NEXT_ARG();
+			if (get_unsigned(&w, *argv, 0) || w == 0 || w > 256)
+				invarg("\"weight\" is invalid\n", *argv);
+			rtnh->rtnh_hops = w - 1;
+		} else if (strcmp(*argv, "onlink") == 0) {
+			rtnh->rtnh_flags |= RTNH_F_ONLINK;
+		} else if (matches(*argv, "realms") == 0) {
+			__u32 realm;
+
+			NEXT_ARG();
+			if (get_rt_realms_or_raw(&realm, *argv))
+				invarg("\"realm\" value is invalid\n", *argv);
+			if (rta_addattr32(rta, len, RTA_FLOW, realm))
+				return -1;
+			rtnh->rtnh_len += sizeof(struct rtattr) + 4;
+		} else if (strcmp(*argv, "encap") == 0) {
+			int old_len = rta->rta_len;
+
+			if (lwt_parse_encap(rta, len, &argc, &argv,
+					    RTA_ENCAP, RTA_ENCAP_TYPE))
+				return -1;
+			rtnh->rtnh_len += rta->rta_len - old_len;
+		} else if (strcmp(*argv, "as") == 0) {
+			inet_prefix addr;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "to") == 0)
+				NEXT_ARG();
+			get_addr(&addr, *argv, r->rtm_family);
+			if (rta_addattr_l(rta, len, RTA_NEWDST,
+					  &addr.data, addr.bytelen))
+				return -1;
+			rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen;
+		} else
+			break;
+	}
+	*argcp = argc;
+	*argvp = argv;
+	return 0;
+}
+
+static int parse_nexthops(struct nlmsghdr *n, struct rtmsg *r,
+			  int argc, char **argv)
+{
+	char buf[4096];
+	struct rtattr *rta = (void *)buf;
+	struct rtnexthop *rtnh;
+
+	rta->rta_type = RTA_MULTIPATH;
+	rta->rta_len = RTA_LENGTH(0);
+	rtnh = RTA_DATA(rta);
+
+	while (argc > 0) {
+		if (strcmp(*argv, "nexthop") != 0) {
+			fprintf(stderr, "Error: \"nexthop\" or end of line is expected instead of \"%s\"\n", *argv);
+			exit(-1);
+		}
+		if (argc <= 1) {
+			fprintf(stderr, "Error: unexpected end of line after \"nexthop\"\n");
+			exit(-1);
+		}
+		memset(rtnh, 0, sizeof(*rtnh));
+		rtnh->rtnh_len = sizeof(*rtnh);
+		rta->rta_len += rtnh->rtnh_len;
+		if (parse_one_nh(n, r, rta, 4096, rtnh, &argc, &argv)) {
+			fprintf(stderr, "Error: cannot parse nexthop\n");
+			exit(-1);
+		}
+		rtnh = RTNH_NEXT(rtnh);
+	}
+
+	if (rta->rta_len > RTA_LENGTH(0))
+		return addattr_l(n, 4096, RTA_MULTIPATH,
+				 RTA_DATA(rta), RTA_PAYLOAD(rta));
+	return 0;
+}
+
+static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
+{
+	struct {
+		struct nlmsghdr	n;
+		struct rtmsg		r;
+		char			buf[4096];
+	} req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
+		.n.nlmsg_flags = NLM_F_REQUEST | flags,
+		.n.nlmsg_type = cmd,
+		.r.rtm_family = preferred_family,
+		.r.rtm_table = RT_TABLE_MAIN,
+		.r.rtm_scope = RT_SCOPE_NOWHERE,
+	};
+	char  mxbuf[256];
+	struct rtattr *mxrta = (void *)mxbuf;
+	unsigned int mxlock = 0;
+	char  *d = NULL;
+	int gw_ok = 0;
+	int dst_ok = 0;
+	int nhs_ok = 0;
+	int scope_ok = 0;
+	int table_ok = 0;
+	int raw = 0;
+	int type_ok = 0;
+	__u32 nhid = 0;
+	int ret;
+
+	if (cmd != RTM_DELROUTE) {
+		req.r.rtm_protocol = RTPROT_BOOT;
+		req.r.rtm_scope = RT_SCOPE_UNIVERSE;
+		req.r.rtm_type = RTN_UNICAST;
+	}
+
+	mxrta->rta_type = RTA_METRICS;
+	mxrta->rta_len = RTA_LENGTH(0);
+
+	while (argc > 0) {
+		if (strcmp(*argv, "src") == 0) {
+			inet_prefix addr;
+
+			NEXT_ARG();
+			get_addr(&addr, *argv, req.r.rtm_family);
+			if (req.r.rtm_family == AF_UNSPEC)
+				req.r.rtm_family = addr.family;
+			addattr_l(&req.n, sizeof(req),
+				  RTA_PREFSRC, &addr.data, addr.bytelen);
+		} else if (strcmp(*argv, "as") == 0) {
+			inet_prefix addr;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "to") == 0) {
+				NEXT_ARG();
+			}
+			get_addr(&addr, *argv, req.r.rtm_family);
+			if (req.r.rtm_family == AF_UNSPEC)
+				req.r.rtm_family = addr.family;
+			addattr_l(&req.n, sizeof(req),
+				  RTA_NEWDST, &addr.data, addr.bytelen);
+		} else if (strcmp(*argv, "via") == 0) {
+			inet_prefix addr;
+			int family;
+
+			if (gw_ok) {
+				invarg("use nexthop syntax to specify multiple via\n",
+				       *argv);
+			}
+			gw_ok = 1;
+			NEXT_ARG();
+			family = read_family(*argv);
+			if (family == AF_UNSPEC)
+				family = req.r.rtm_family;
+			else
+				NEXT_ARG();
+			get_addr(&addr, *argv, family);
+			if (req.r.rtm_family == AF_UNSPEC)
+				req.r.rtm_family = addr.family;
+			if (addr.family == req.r.rtm_family)
+				addattr_l(&req.n, sizeof(req), RTA_GATEWAY,
+					  &addr.data, addr.bytelen);
+			else
+				addattr_l(&req.n, sizeof(req), RTA_VIA,
+					  &addr.family, addr.bytelen+2);
+		} else if (strcmp(*argv, "from") == 0) {
+			inet_prefix addr;
+
+			NEXT_ARG();
+			get_prefix(&addr, *argv, req.r.rtm_family);
+			if (req.r.rtm_family == AF_UNSPEC)
+				req.r.rtm_family = addr.family;
+			if (addr.bytelen)
+				addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
+			req.r.rtm_src_len = addr.bitlen;
+		} else if (strcmp(*argv, "tos") == 0 ||
+			   matches(*argv, "dsfield") == 0) {
+			__u32 tos;
+
+			NEXT_ARG();
+			if (rtnl_dsfield_a2n(&tos, *argv))
+				invarg("\"tos\" value is invalid\n", *argv);
+			req.r.rtm_tos = tos;
+		} else if (strcmp(*argv, "expires") == 0) {
+			__u32 expires;
+
+			NEXT_ARG();
+			if (get_u32(&expires, *argv, 0))
+				invarg("\"expires\" value is invalid\n", *argv);
+			addattr32(&req.n, sizeof(req), RTA_EXPIRES, expires);
+		} else if (matches(*argv, "metric") == 0 ||
+			   matches(*argv, "priority") == 0 ||
+			   strcmp(*argv, "preference") == 0) {
+			__u32 metric;
+
+			NEXT_ARG();
+			if (get_u32(&metric, *argv, 0))
+				invarg("\"metric\" value is invalid\n", *argv);
+			addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
+		} else if (strcmp(*argv, "scope") == 0) {
+			__u32 scope = 0;
+
+			NEXT_ARG();
+			if (rtnl_rtscope_a2n(&scope, *argv))
+				invarg("invalid \"scope\" value\n", *argv);
+			req.r.rtm_scope = scope;
+			scope_ok = 1;
+		} else if (strcmp(*argv, "mtu") == 0) {
+			unsigned int mtu;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_MTU);
+				NEXT_ARG();
+			}
+			if (get_unsigned(&mtu, *argv, 0))
+				invarg("\"mtu\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
+		} else if (strcmp(*argv, "hoplimit") == 0) {
+			unsigned int hoplimit;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_HOPLIMIT);
+				NEXT_ARG();
+			}
+			if (get_unsigned(&hoplimit, *argv, 0) || hoplimit > 255)
+				invarg("\"hoplimit\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_HOPLIMIT, hoplimit);
+		} else if (strcmp(*argv, "advmss") == 0) {
+			unsigned int mss;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_ADVMSS);
+				NEXT_ARG();
+			}
+			if (get_unsigned(&mss, *argv, 0))
+				invarg("\"mss\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_ADVMSS, mss);
+		} else if (matches(*argv, "reordering") == 0) {
+			unsigned int reord;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_REORDERING);
+				NEXT_ARG();
+			}
+			if (get_unsigned(&reord, *argv, 0))
+				invarg("\"reordering\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_REORDERING, reord);
+		} else if (strcmp(*argv, "rtt") == 0) {
+			unsigned int rtt;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_RTT);
+				NEXT_ARG();
+			}
+			if (get_time_rtt(&rtt, *argv, &raw))
+				invarg("\"rtt\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTT,
+				(raw) ? rtt : rtt * 8);
+		} else if (strcmp(*argv, "rto_min") == 0) {
+			unsigned int rto_min;
+
+			NEXT_ARG();
+			mxlock |= (1<<RTAX_RTO_MIN);
+			if (get_time_rtt(&rto_min, *argv, &raw))
+				invarg("\"rto_min\" value is invalid\n",
+				       *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTO_MIN,
+				      rto_min);
+		} else if (matches(*argv, "window") == 0) {
+			unsigned int win;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_WINDOW);
+				NEXT_ARG();
+			}
+			if (get_unsigned(&win, *argv, 0))
+				invarg("\"window\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_WINDOW, win);
+		} else if (matches(*argv, "cwnd") == 0) {
+			unsigned int win;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_CWND);
+				NEXT_ARG();
+			}
+			if (get_unsigned(&win, *argv, 0))
+				invarg("\"cwnd\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_CWND, win);
+		} else if (matches(*argv, "initcwnd") == 0) {
+			unsigned int win;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_INITCWND);
+				NEXT_ARG();
+			}
+			if (get_unsigned(&win, *argv, 0))
+				invarg("\"initcwnd\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf),
+				      RTAX_INITCWND, win);
+		} else if (matches(*argv, "initrwnd") == 0) {
+			unsigned int win;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_INITRWND);
+				NEXT_ARG();
+			}
+			if (get_unsigned(&win, *argv, 0))
+				invarg("\"initrwnd\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf),
+				      RTAX_INITRWND, win);
+		} else if (matches(*argv, "features") == 0) {
+			unsigned int features = 0;
+
+			while (argc > 0) {
+				NEXT_ARG();
+
+				if (strcmp(*argv, "ecn") == 0)
+					features |= RTAX_FEATURE_ECN;
+				else
+					invarg("\"features\" value not valid\n", *argv);
+				break;
+			}
+
+			rta_addattr32(mxrta, sizeof(mxbuf),
+				      RTAX_FEATURES, features);
+		} else if (matches(*argv, "quickack") == 0) {
+			unsigned int quickack;
+
+			NEXT_ARG();
+			if (get_unsigned(&quickack, *argv, 0))
+				invarg("\"quickack\" value is invalid\n", *argv);
+			if (quickack != 1 && quickack != 0)
+				invarg("\"quickack\" value should be 0 or 1\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf),
+				      RTAX_QUICKACK, quickack);
+		} else if (matches(*argv, "congctl") == 0) {
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= 1 << RTAX_CC_ALGO;
+				NEXT_ARG();
+			}
+			rta_addattr_l(mxrta, sizeof(mxbuf), RTAX_CC_ALGO, *argv,
+				      strlen(*argv));
+		} else if (matches(*argv, "rttvar") == 0) {
+			unsigned int win;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_RTTVAR);
+				NEXT_ARG();
+			}
+			if (get_time_rtt(&win, *argv, &raw))
+				invarg("\"rttvar\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTTVAR,
+				(raw) ? win : win * 4);
+		} else if (matches(*argv, "ssthresh") == 0) {
+			unsigned int win;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "lock") == 0) {
+				mxlock |= (1<<RTAX_SSTHRESH);
+				NEXT_ARG();
+			}
+			if (get_unsigned(&win, *argv, 0))
+				invarg("\"ssthresh\" value is invalid\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_SSTHRESH, win);
+		} else if (matches(*argv, "realms") == 0) {
+			__u32 realm;
+
+			NEXT_ARG();
+			if (get_rt_realms_or_raw(&realm, *argv))
+				invarg("\"realm\" value is invalid\n", *argv);
+			addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
+		} else if (strcmp(*argv, "onlink") == 0) {
+			req.r.rtm_flags |= RTNH_F_ONLINK;
+		} else if (strcmp(*argv, "nexthop") == 0) {
+			nhs_ok = 1;
+			break;
+		} else if (!strcmp(*argv, "nhid")) {
+			NEXT_ARG();
+			if (get_u32(&nhid, *argv, 0))
+				invarg("\"id\" value is invalid\n", *argv);
+			addattr32(&req.n, sizeof(req), RTA_NH_ID, nhid);
+		} else if (matches(*argv, "protocol") == 0) {
+			__u32 prot;
+
+			NEXT_ARG();
+			if (rtnl_rtprot_a2n(&prot, *argv))
+				invarg("\"protocol\" value is invalid\n", *argv);
+			req.r.rtm_protocol = prot;
+		} else if (matches(*argv, "table") == 0) {
+			__u32 tid;
+
+			NEXT_ARG();
+			if (rtnl_rttable_a2n(&tid, *argv))
+				invarg("\"table\" value is invalid\n", *argv);
+			if (tid < 256)
+				req.r.rtm_table = tid;
+			else {
+				req.r.rtm_table = RT_TABLE_UNSPEC;
+				addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
+			}
+			table_ok = 1;
+		} else if (matches(*argv, "vrf") == 0) {
+			__u32 tid;
+
+			NEXT_ARG();
+			tid = ipvrf_get_table(*argv);
+			if (tid == 0)
+				invarg("Invalid VRF\n", *argv);
+			if (tid < 256)
+				req.r.rtm_table = tid;
+			else {
+				req.r.rtm_table = RT_TABLE_UNSPEC;
+				addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
+			}
+			table_ok = 1;
+		} else if (strcmp(*argv, "dev") == 0 ||
+			   strcmp(*argv, "oif") == 0) {
+			NEXT_ARG();
+			d = *argv;
+		} else if (matches(*argv, "pref") == 0) {
+			__u8 pref;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "low") == 0)
+				pref = ICMPV6_ROUTER_PREF_LOW;
+			else if (strcmp(*argv, "medium") == 0)
+				pref = ICMPV6_ROUTER_PREF_MEDIUM;
+			else if (strcmp(*argv, "high") == 0)
+				pref = ICMPV6_ROUTER_PREF_HIGH;
+			else if (get_u8(&pref, *argv, 0))
+				invarg("\"pref\" value is invalid\n", *argv);
+			addattr8(&req.n, sizeof(req), RTA_PREF, pref);
+		} else if (strcmp(*argv, "encap") == 0) {
+			char buf[1024];
+			struct rtattr *rta = (void *)buf;
+
+			rta->rta_type = RTA_ENCAP;
+			rta->rta_len = RTA_LENGTH(0);
+
+			lwt_parse_encap(rta, sizeof(buf), &argc, &argv,
+					RTA_ENCAP, RTA_ENCAP_TYPE);
+
+			if (rta->rta_len > RTA_LENGTH(0))
+				addraw_l(&req.n, 1024
+					 , RTA_DATA(rta), RTA_PAYLOAD(rta));
+		} else if (strcmp(*argv, "ttl-propagate") == 0) {
+			__u8 ttl_prop;
+
+			NEXT_ARG();
+			if (matches(*argv, "enabled") == 0)
+				ttl_prop = 1;
+			else if (matches(*argv, "disabled") == 0)
+				ttl_prop = 0;
+			else
+				invarg("\"ttl-propagate\" value is invalid\n",
+				       *argv);
+
+			addattr8(&req.n, sizeof(req), RTA_TTL_PROPAGATE,
+				 ttl_prop);
+		} else if (matches(*argv, "fastopen_no_cookie") == 0) {
+			unsigned int fastopen_no_cookie;
+
+			NEXT_ARG();
+			if (get_unsigned(&fastopen_no_cookie, *argv, 0))
+				invarg("\"fastopen_no_cookie\" value is invalid\n", *argv);
+			if (fastopen_no_cookie != 1 && fastopen_no_cookie != 0)
+				invarg("\"fastopen_no_cookie\" value should be 0 or 1\n", *argv);
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_FASTOPEN_NO_COOKIE, fastopen_no_cookie);
+		} else {
+			int type;
+			inet_prefix dst;
+
+			if (strcmp(*argv, "to") == 0) {
+				NEXT_ARG();
+			}
+			if ((**argv < '0' || **argv > '9') &&
+			    rtnl_rtntype_a2n(&type, *argv) == 0) {
+				NEXT_ARG();
+				req.r.rtm_type = type;
+				type_ok = 1;
+			}
+
+			if (matches(*argv, "help") == 0)
+				usage();
+			if (dst_ok)
+				duparg2("to", *argv);
+			get_prefix(&dst, *argv, req.r.rtm_family);
+			if (req.r.rtm_family == AF_UNSPEC)
+				req.r.rtm_family = dst.family;
+			req.r.rtm_dst_len = dst.bitlen;
+			dst_ok = 1;
+			if (dst.bytelen)
+				addattr_l(&req.n, sizeof(req),
+					  RTA_DST, &dst.data, dst.bytelen);
+		}
+		argc--; argv++;
+	}
+
+	if (!dst_ok)
+		usage();
+
+	if (d) {
+		int idx = ll_name_to_index(d);
+
+		if (!idx)
+			return nodev(d);
+		addattr32(&req.n, sizeof(req), RTA_OIF, idx);
+	}
+
+	if (mxrta->rta_len > RTA_LENGTH(0)) {
+		if (mxlock)
+			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
+		addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
+	}
+
+	if (nhs_ok && parse_nexthops(&req.n, &req.r, argc, argv))
+		return -1;
+
+	if (req.r.rtm_family == AF_UNSPEC)
+		req.r.rtm_family = AF_INET;
+
+	if (!table_ok) {
+		if (req.r.rtm_type == RTN_LOCAL ||
+		    req.r.rtm_type == RTN_BROADCAST ||
+		    req.r.rtm_type == RTN_NAT ||
+		    req.r.rtm_type == RTN_ANYCAST)
+			req.r.rtm_table = RT_TABLE_LOCAL;
+	}
+	if (!scope_ok) {
+		if (req.r.rtm_family == AF_INET6 ||
+		    req.r.rtm_family == AF_MPLS)
+			req.r.rtm_scope = RT_SCOPE_UNIVERSE;
+		else if (req.r.rtm_type == RTN_LOCAL ||
+			 req.r.rtm_type == RTN_NAT)
+			req.r.rtm_scope = RT_SCOPE_HOST;
+		else if (req.r.rtm_type == RTN_BROADCAST ||
+			 req.r.rtm_type == RTN_MULTICAST ||
+			 req.r.rtm_type == RTN_ANYCAST)
+			req.r.rtm_scope = RT_SCOPE_LINK;
+		else if (req.r.rtm_type == RTN_UNICAST ||
+			 req.r.rtm_type == RTN_UNSPEC) {
+			if (cmd == RTM_DELROUTE)
+				req.r.rtm_scope = RT_SCOPE_NOWHERE;
+			else if (!gw_ok && !nhs_ok && !nhid)
+				req.r.rtm_scope = RT_SCOPE_LINK;
+		}
+	}
+
+	if (!type_ok && req.r.rtm_family == AF_MPLS)
+		req.r.rtm_type = RTN_UNICAST;
+
+	if (echo_request)
+		ret = rtnl_echo_talk(&rth, &req.n, json, print_route);
+	else
+		ret = rtnl_talk(&rth, &req.n, NULL);
+
+	if (ret)
+		return -2;
+
+	return 0;
+}
+
+static int iproute_flush_cache(void)
+{
+#define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
+
+	int len;
+	int flush_fd = open(ROUTE_FLUSH_PATH, O_WRONLY);
+	char *buffer = "-1";
+
+	if (flush_fd < 0) {
+		fprintf(stderr, "Cannot open \"%s\": %s\n",
+				ROUTE_FLUSH_PATH, strerror(errno));
+		return -1;
+	}
+
+	len = strlen(buffer);
+
+	if ((write(flush_fd, (void *)buffer, len)) < len) {
+		fprintf(stderr, "Cannot flush routing cache\n");
+		close(flush_fd);
+		return -1;
+	}
+	close(flush_fd);
+	return 0;
+}
+
+static __u32 route_dump_magic = 0x45311224;
+
+static int save_route(struct nlmsghdr *n, void *arg)
+{
+	int ret;
+	int len = n->nlmsg_len;
+	struct rtmsg *r = NLMSG_DATA(n);
+	struct rtattr *tb[RTA_MAX+1];
+	int host_len;
+
+	host_len = af_bit_len(r->rtm_family);
+	len -= NLMSG_LENGTH(sizeof(*r));
+	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
+
+	if (!filter_nlmsg(n, tb, host_len))
+		return 0;
+
+	ret = write(STDOUT_FILENO, n, n->nlmsg_len);
+	if ((ret > 0) && (ret != n->nlmsg_len)) {
+		fprintf(stderr, "Short write while saving nlmsg\n");
+		ret = -EIO;
+	}
+
+	return ret == n->nlmsg_len ? 0 : ret;
+}
+
+static int save_route_prep(void)
+{
+	int ret;
+
+	if (isatty(STDOUT_FILENO)) {
+		fprintf(stderr, "Not sending a binary stream to stdout\n");
+		return -1;
+	}
+
+	ret = write(STDOUT_FILENO, &route_dump_magic, sizeof(route_dump_magic));
+	if (ret != sizeof(route_dump_magic)) {
+		fprintf(stderr, "Can't write magic to dump file\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int iproute_dump_filter(struct nlmsghdr *nlh, int reqlen)
+{
+	struct rtmsg *rtm = NLMSG_DATA(nlh);
+	int err;
+
+	rtm->rtm_protocol = filter.protocol;
+	if (filter.cloned)
+		rtm->rtm_flags |= RTM_F_CLONED;
+
+	if (filter.tb) {
+		err = addattr32(nlh, reqlen, RTA_TABLE, filter.tb);
+		if (err)
+			return err;
+	}
+
+	if (filter.oif) {
+		err = addattr32(nlh, reqlen, RTA_OIF, filter.oif);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int iproute_flush(int family, rtnl_filter_t filter_fn)
+{
+	time_t start = time(0);
+	char flushb[4096-512];
+	int round = 0;
+	int ret;
+
+	if (filter.cloned) {
+		if (family != AF_INET6) {
+			iproute_flush_cache();
+			if (show_stats)
+				printf("*** IPv4 routing cache is flushed.\n");
+		}
+		if (family == AF_INET)
+			return 0;
+	}
+
+	filter.flushb = flushb;
+	filter.flushp = 0;
+	filter.flushe = sizeof(flushb);
+
+	for (;;) {
+		if (rtnl_routedump_req(&rth, family, iproute_dump_filter) < 0) {
+			perror("Cannot send dump request");
+			return -2;
+		}
+		filter.flushed = 0;
+		if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
+			fprintf(stderr, "Flush terminated\n");
+			return -2;
+		}
+		if (filter.flushed == 0) {
+			if (show_stats) {
+				if (round == 0 &&
+				    (!filter.cloned || family == AF_INET6))
+					printf("Nothing to flush.\n");
+				else
+					printf("*** Flush is complete after %d round%s ***\n",
+					       round, round > 1 ? "s" : "");
+			}
+			fflush(stdout);
+			return 0;
+		}
+		round++;
+		ret = flush_update();
+		if (ret < 0)
+			return ret;
+
+		if (time(0) - start > 30) {
+			printf("\n*** Flush not completed after %ld seconds, %d entries remain ***\n",
+			       (long)(time(0) - start), filter.flushed);
+			return -1;
+		}
+
+		if (show_stats) {
+			printf("\n*** Round %d, deleting %d entries ***\n",
+			       round, filter.flushed);
+			fflush(stdout);
+		}
+	}
+}
+
+static int save_route_errhndlr(struct nlmsghdr *n, void *arg)
+{
+	int err = -*(int *)NLMSG_DATA(n);
+
+	if (n->nlmsg_type == NLMSG_DONE &&
+	    filter.tb == RT_TABLE_MAIN &&
+	    err == ENOENT)
+		return RTNL_SUPPRESS_NLMSG_DONE_NLERR;
+
+	return RTNL_LET_NLERR;
+}
+
+static int iproute_list_flush_or_save(int argc, char **argv, int action)
+{
+	int dump_family = preferred_family;
+	char *id = NULL;
+	char *od = NULL;
+	unsigned int mark = 0;
+	rtnl_filter_t filter_fn;
+
+	if (action == IPROUTE_SAVE) {
+		if (save_route_prep())
+			return -1;
+
+		filter_fn = save_route;
+	} else
+		filter_fn = print_route;
+
+	iproute_reset_filter(0);
+	filter.tb = RT_TABLE_MAIN;
+
+	if ((action == IPROUTE_FLUSH) && argc <= 0) {
+		fprintf(stderr, "\"ip route flush\" requires arguments.\n");
+		return -1;
+	}
+
+	while (argc > 0) {
+		if (matches(*argv, "table") == 0) {
+			__u32 tid;
+
+			NEXT_ARG();
+			if (rtnl_rttable_a2n(&tid, *argv)) {
+				if (strcmp(*argv, "all") == 0) {
+					filter.tb = 0;
+				} else if (strcmp(*argv, "cache") == 0) {
+					filter.cloned = 1;
+				} else if (strcmp(*argv, "help") == 0) {
+					usage();
+				} else {
+					invarg("table id value is invalid\n", *argv);
+				}
+			} else
+				filter.tb = tid;
+		} else if (matches(*argv, "vrf") == 0) {
+			__u32 tid;
+
+			NEXT_ARG();
+			tid = ipvrf_get_table(*argv);
+			if (tid == 0)
+				invarg("Invalid VRF\n", *argv);
+			filter.tb = tid;
+			filter.typemask = ~(1 << RTN_LOCAL | 1<<RTN_BROADCAST);
+		} else if (matches(*argv, "cached") == 0 ||
+			   matches(*argv, "cloned") == 0) {
+			filter.cloned = 1;
+		} else if (strcmp(*argv, "tos") == 0 ||
+			   matches(*argv, "dsfield") == 0) {
+			__u32 tos;
+
+			NEXT_ARG();
+			if (rtnl_dsfield_a2n(&tos, *argv))
+				invarg("TOS value is invalid\n", *argv);
+			filter.tos = tos;
+			filter.tosmask = -1;
+		} else if (matches(*argv, "protocol") == 0) {
+			__u32 prot = 0;
+
+			NEXT_ARG();
+			filter.protocolmask = -1;
+			if (rtnl_rtprot_a2n(&prot, *argv)) {
+				if (strcmp(*argv, "all") != 0)
+					invarg("invalid \"protocol\"\n", *argv);
+				prot = 0;
+				filter.protocolmask = 0;
+			}
+			filter.protocol = prot;
+		} else if (matches(*argv, "scope") == 0) {
+			__u32 scope = 0;
+
+			NEXT_ARG();
+			filter.scopemask = -1;
+			if (rtnl_rtscope_a2n(&scope, *argv)) {
+				if (strcmp(*argv, "all") != 0)
+					invarg("invalid \"scope\"\n", *argv);
+				scope = RT_SCOPE_NOWHERE;
+				filter.scopemask = 0;
+			}
+			filter.scope = scope;
+		} else if (matches(*argv, "type") == 0) {
+			int type;
+
+			NEXT_ARG();
+			if (rtnl_rtntype_a2n(&type, *argv))
+				invarg("node type value is invalid\n", *argv);
+			filter.typemask = (1<<type);
+		} else if (strcmp(*argv, "dev") == 0 ||
+			   strcmp(*argv, "oif") == 0) {
+			NEXT_ARG();
+			od = *argv;
+		} else if (strcmp(*argv, "iif") == 0) {
+			NEXT_ARG();
+			id = *argv;
+		} else if (strcmp(*argv, "mark") == 0) {
+			NEXT_ARG();
+			if (get_unsigned(&mark, *argv, 0))
+				invarg("invalid mark value", *argv);
+			filter.markmask = -1;
+		} else if (matches(*argv, "metric") == 0 ||
+			   matches(*argv, "priority") == 0 ||
+			   strcmp(*argv, "preference") == 0) {
+			__u32 metric;
+
+			NEXT_ARG();
+			if (get_u32(&metric, *argv, 0))
+				invarg("\"metric\" value is invalid\n", *argv);
+			filter.metric = metric;
+			filter.metricmask = -1;
+		} else if (strcmp(*argv, "via") == 0) {
+			int family;
+
+			NEXT_ARG();
+			family = read_family(*argv);
+			if (family == AF_UNSPEC)
+				family = dump_family;
+			else
+				NEXT_ARG();
+			get_prefix(&filter.rvia, *argv, family);
+		} else if (strcmp(*argv, "src") == 0) {
+			NEXT_ARG();
+			get_prefix(&filter.rprefsrc, *argv, dump_family);
+		} else if (matches(*argv, "realms") == 0) {
+			__u32 realm;
+
+			NEXT_ARG();
+			if (get_rt_realms_or_raw(&realm, *argv))
+				invarg("invalid realms\n", *argv);
+			filter.realm = realm;
+			filter.realmmask = ~0U;
+			if ((filter.realm&0xFFFF) == 0 &&
+			    (*argv)[strlen(*argv) - 1] == '/')
+				filter.realmmask &= ~0xFFFF;
+			if ((filter.realm&0xFFFF0000U) == 0 &&
+			    (strchr(*argv, '/') == NULL ||
+			     (*argv)[0] == '/'))
+				filter.realmmask &= ~0xFFFF0000U;
+		} else if (matches(*argv, "from") == 0) {
+			NEXT_ARG();
+			if (matches(*argv, "root") == 0) {
+				NEXT_ARG();
+				get_prefix(&filter.rsrc, *argv, dump_family);
+			} else if (matches(*argv, "match") == 0) {
+				NEXT_ARG();
+				get_prefix(&filter.msrc, *argv, dump_family);
+			} else {
+				if (matches(*argv, "exact") == 0) {
+					NEXT_ARG();
+				}
+				get_prefix(&filter.msrc, *argv, dump_family);
+				filter.rsrc = filter.msrc;
+			}
+		} else {
+			if (matches(*argv, "to") == 0) {
+				NEXT_ARG();
+			}
+			if (matches(*argv, "root") == 0) {
+				NEXT_ARG();
+				get_prefix(&filter.rdst, *argv, dump_family);
+			} else if (matches(*argv, "match") == 0) {
+				NEXT_ARG();
+				get_prefix(&filter.mdst, *argv, dump_family);
+			} else {
+				if (matches(*argv, "exact") == 0) {
+					NEXT_ARG();
+				}
+				get_prefix(&filter.mdst, *argv, dump_family);
+				filter.rdst = filter.mdst;
+			}
+		}
+		argc--; argv++;
+	}
+
+	if (dump_family == AF_UNSPEC && filter.tb)
+		dump_family = AF_INET;
+
+	if (id || od)  {
+		int idx;
+
+		if (id) {
+			idx = ll_name_to_index(id);
+			if (!idx)
+				return nodev(id);
+			filter.iif = idx;
+			filter.iifmask = -1;
+		}
+		if (od) {
+			idx = ll_name_to_index(od);
+			if (!idx)
+				return nodev(od);
+			filter.oif = idx;
+			filter.oifmask = -1;
+		}
+	}
+	filter.mark = mark;
+
+	if (action == IPROUTE_FLUSH)
+		return iproute_flush(dump_family, filter_fn);
+
+	if (rtnl_routedump_req(&rth, dump_family, iproute_dump_filter) < 0) {
+		perror("Cannot send dump request");
+		return -2;
+	}
+
+	new_json_obj(json);
+
+	if (rtnl_dump_filter_errhndlr(&rth, filter_fn, stdout,
+				      save_route_errhndlr, NULL) < 0) {
+		fprintf(stderr, "Dump terminated\n");
+		return -2;
+	}
+
+	delete_json_obj();
+	fflush(stdout);
+	return 0;
+}
+
+
+static int iproute_get(int argc, char **argv)
+{
+	struct {
+		struct nlmsghdr	n;
+		struct rtmsg		r;
+		char			buf[1024];
+	} req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
+		.n.nlmsg_flags = NLM_F_REQUEST,
+		.n.nlmsg_type = RTM_GETROUTE,
+		.r.rtm_family = preferred_family,
+	};
+	char  *idev = NULL;
+	char  *odev = NULL;
+	struct nlmsghdr *answer;
+	int connected = 0;
+	int fib_match = 0;
+	int from_ok = 0;
+	unsigned int mark = 0;
+	bool address_found = false;
+
+	iproute_reset_filter(0);
+	filter.cloned = 2;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "tos") == 0 ||
+		    matches(*argv, "dsfield") == 0) {
+			__u32 tos;
+
+			NEXT_ARG();
+			if (rtnl_dsfield_a2n(&tos, *argv))
+				invarg("TOS value is invalid\n", *argv);
+			req.r.rtm_tos = tos;
+		} else if (matches(*argv, "from") == 0) {
+			inet_prefix addr;
+
+			NEXT_ARG();
+			if (matches(*argv, "help") == 0)
+				usage();
+			from_ok = 1;
+			get_prefix(&addr, *argv, req.r.rtm_family);
+			if (req.r.rtm_family == AF_UNSPEC)
+				req.r.rtm_family = addr.family;
+			if (addr.bytelen)
+				addattr_l(&req.n, sizeof(req), RTA_SRC,
+					  &addr.data, addr.bytelen);
+			req.r.rtm_src_len = addr.bitlen;
+		} else if (matches(*argv, "iif") == 0) {
+			NEXT_ARG();
+			idev = *argv;
+		} else if (matches(*argv, "mark") == 0) {
+			NEXT_ARG();
+			if (get_unsigned(&mark, *argv, 0))
+				invarg("invalid mark value", *argv);
+		} else if (matches(*argv, "oif") == 0 ||
+			   strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			odev = *argv;
+		} else if (matches(*argv, "notify") == 0) {
+			req.r.rtm_flags |= RTM_F_NOTIFY;
+		} else if (matches(*argv, "connected") == 0) {
+			connected = 1;
+		} else if (matches(*argv, "vrf") == 0) {
+			NEXT_ARG();
+			if (!name_is_vrf(*argv))
+				invarg("Invalid VRF\n", *argv);
+			odev = *argv;
+		} else if (matches(*argv, "uid") == 0) {
+			uid_t uid;
+
+			NEXT_ARG();
+			if (get_unsigned(&uid, *argv, 0))
+				invarg("invalid UID\n", *argv);
+			addattr32(&req.n, sizeof(req), RTA_UID, uid);
+		} else if (matches(*argv, "fibmatch") == 0) {
+			fib_match = 1;
+		} else if (strcmp(*argv, "as") == 0) {
+			inet_prefix addr;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "to") == 0)
+				NEXT_ARG();
+			get_addr(&addr, *argv, req.r.rtm_family);
+			if (req.r.rtm_family == AF_UNSPEC)
+				req.r.rtm_family = addr.family;
+			addattr_l(&req.n, sizeof(req), RTA_NEWDST,
+				  &addr.data, addr.bytelen);
+		} else if (matches(*argv, "sport") == 0) {
+			__be16 sport;
+
+			NEXT_ARG();
+			if (get_be16(&sport, *argv, 0))
+				invarg("invalid sport\n", *argv);
+			addattr16(&req.n, sizeof(req), RTA_SPORT, sport);
+		} else if (matches(*argv, "dport") == 0) {
+			__be16 dport;
+
+			NEXT_ARG();
+			if (get_be16(&dport, *argv, 0))
+				invarg("invalid dport\n", *argv);
+			addattr16(&req.n, sizeof(req), RTA_DPORT, dport);
+		} else if (matches(*argv, "ipproto") == 0) {
+			int ipproto;
+
+			NEXT_ARG();
+			ipproto = inet_proto_a2n(*argv);
+			if (ipproto < 0)
+				invarg("Invalid \"ipproto\" value\n",
+				       *argv);
+			addattr8(&req.n, sizeof(req), RTA_IP_PROTO, ipproto);
+		} else {
+			inet_prefix addr;
+
+			if (strcmp(*argv, "to") == 0) {
+				NEXT_ARG();
+			}
+			if (matches(*argv, "help") == 0)
+				usage();
+			get_prefix(&addr, *argv, req.r.rtm_family);
+			if (req.r.rtm_family == AF_UNSPEC)
+				req.r.rtm_family = addr.family;
+			if (addr.bytelen)
+				addattr_l(&req.n, sizeof(req),
+					  RTA_DST, &addr.data, addr.bytelen);
+			if (req.r.rtm_family == AF_INET && addr.bitlen != 32) {
+				fprintf(stderr,
+					"Warning: /%u as prefix is invalid, only /32 (or none) is supported.\n",
+					addr.bitlen);
+				req.r.rtm_dst_len = 32;
+			} else if (req.r.rtm_family == AF_INET6 && addr.bitlen != 128) {
+				fprintf(stderr,
+					"Warning: /%u as prefix is invalid, only /128 (or none) is supported.\n",
+					addr.bitlen);
+				req.r.rtm_dst_len = 128;
+			} else
+				req.r.rtm_dst_len = addr.bitlen;
+			address_found = true;
+		}
+		argc--; argv++;
+	}
+
+	if (!address_found) {
+		fprintf(stderr, "need at least a destination address\n");
+		return -1;
+	}
+
+	if (idev || odev)  {
+		int idx;
+
+		if (idev) {
+			idx = ll_name_to_index(idev);
+			if (!idx)
+				return nodev(idev);
+			addattr32(&req.n, sizeof(req), RTA_IIF, idx);
+		}
+		if (odev) {
+			idx = ll_name_to_index(odev);
+			if (!idx)
+				return nodev(odev);
+			addattr32(&req.n, sizeof(req), RTA_OIF, idx);
+		}
+	}
+	if (mark)
+		addattr32(&req.n, sizeof(req), RTA_MARK, mark);
+
+	if (req.r.rtm_family == AF_UNSPEC)
+		req.r.rtm_family = AF_INET;
+
+	/* Only IPv4 supports the RTM_F_LOOKUP_TABLE flag */
+	if (req.r.rtm_family == AF_INET)
+		req.r.rtm_flags |= RTM_F_LOOKUP_TABLE;
+	if (fib_match)
+		req.r.rtm_flags |= RTM_F_FIB_MATCH;
+
+	if (rtnl_talk(&rth, &req.n, &answer) < 0)
+		return -2;
+
+	new_json_obj(json);
+
+	if (connected && !from_ok) {
+		struct rtmsg *r = NLMSG_DATA(answer);
+		int len = answer->nlmsg_len;
+		struct rtattr *tb[RTA_MAX+1];
+
+		if (print_route(answer, (void *)stdout) < 0) {
+			fprintf(stderr, "An error :-)\n");
+			free(answer);
+			return -1;
+		}
+
+		if (answer->nlmsg_type != RTM_NEWROUTE) {
+			fprintf(stderr, "Not a route?\n");
+			free(answer);
+			return -1;
+		}
+		len -= NLMSG_LENGTH(sizeof(*r));
+		if (len < 0) {
+			fprintf(stderr, "Wrong len %d\n", len);
+			free(answer);
+			return -1;
+		}
+
+		parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
+
+		if (tb[RTA_PREFSRC]) {
+			tb[RTA_PREFSRC]->rta_type = RTA_SRC;
+			r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
+		} else if (!tb[RTA_SRC]) {
+			fprintf(stderr, "Failed to connect the route\n");
+			free(answer);
+			return -1;
+		}
+		if (!odev && tb[RTA_OIF])
+			tb[RTA_OIF]->rta_type = 0;
+		if (tb[RTA_GATEWAY])
+			tb[RTA_GATEWAY]->rta_type = 0;
+		if (tb[RTA_VIA])
+			tb[RTA_VIA]->rta_type = 0;
+		if (!idev && tb[RTA_IIF])
+			tb[RTA_IIF]->rta_type = 0;
+		req.n.nlmsg_flags = NLM_F_REQUEST;
+		req.n.nlmsg_type = RTM_GETROUTE;
+
+		delete_json_obj();
+		free(answer);
+		if (rtnl_talk(&rth, &req.n, &answer) < 0)
+			return -2;
+	}
+
+	if (print_route(answer, (void *)stdout) < 0) {
+		fprintf(stderr, "An error :-)\n");
+		free(answer);
+		return -1;
+	}
+
+	delete_json_obj();
+	free(answer);
+	return 0;
+}
+
+static int rtattr_cmp(const struct rtattr *rta1, const struct rtattr *rta2)
+{
+	if (!rta1 || !rta2 || rta1->rta_len != rta2->rta_len)
+		return 1;
+
+	return memcmp(RTA_DATA(rta1), RTA_DATA(rta2), RTA_PAYLOAD(rta1));
+}
+
+static int restore_handler(struct rtnl_ctrl_data *ctrl,
+			   struct nlmsghdr *n, void *arg)
+{
+	struct rtmsg *r = NLMSG_DATA(n);
+	struct rtattr *tb[RTA_MAX+1];
+	int len = n->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
+	int ret, prio = *(int *)arg;
+
+	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
+
+	/* Restore routes in correct order:
+	 * 0. ones for local addresses,
+	 * 1. ones for local networks,
+	 * 2. others (remote networks/hosts).
+	 */
+	if (!prio && !tb[RTA_GATEWAY] && (!tb[RTA_PREFSRC] ||
+	    !rtattr_cmp(tb[RTA_PREFSRC], tb[RTA_DST])))
+		goto restore;
+	else if (prio == 1 && !tb[RTA_GATEWAY] && tb[RTA_PREFSRC] &&
+		 rtattr_cmp(tb[RTA_PREFSRC], tb[RTA_DST]))
+		goto restore;
+	else if (prio == 2 && tb[RTA_GATEWAY])
+		goto restore;
+
+	return 0;
+
+restore:
+	n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
+
+	ll_init_map(&rth);
+
+	ret = rtnl_talk(&rth, n, NULL);
+	if ((ret < 0) && (errno == EEXIST))
+		ret = 0;
+
+	return ret;
+}
+
+static int route_dump_check_magic(void)
+{
+	int ret;
+	__u32 magic = 0;
+
+	if (isatty(STDIN_FILENO)) {
+		fprintf(stderr, "Can't restore route dump from a terminal\n");
+		return -1;
+	}
+
+	ret = fread(&magic, sizeof(magic), 1, stdin);
+	if (magic != route_dump_magic) {
+		fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n", ret, magic);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int iproute_restore(void)
+{
+	int pos, prio;
+
+	if (route_dump_check_magic())
+		return -1;
+
+	pos = ftell(stdin);
+	if (pos == -1) {
+		perror("Failed to restore: ftell");
+		return -1;
+	}
+
+	for (prio = 0; prio < 3; prio++) {
+		int err;
+
+		err = rtnl_from_file(stdin, &restore_handler, &prio);
+		if (err)
+			return -2;
+
+		if (fseek(stdin, pos, SEEK_SET) == -1) {
+			perror("Failed to restore: fseek");
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+static int show_handler(struct rtnl_ctrl_data *ctrl,
+			struct nlmsghdr *n, void *arg)
+{
+	print_route(n, stdout);
+	return 0;
+}
+
+static int iproute_showdump(void)
+{
+	if (route_dump_check_magic())
+		return -1;
+
+	if (rtnl_from_file(stdin, &show_handler, NULL))
+		return -2;
+
+	return 0;
+}
+
+void iproute_reset_filter(int ifindex)
+{
+	memset(&filter, 0, sizeof(filter));
+	filter.mdst.bitlen = -1;
+	filter.msrc.bitlen = -1;
+	filter.oif = ifindex;
+	if (filter.oif > 0)
+		filter.oifmask = -1;
+}
+
+int do_iproute(int argc, char **argv)
+{
+	if (argc < 1)
+		return iproute_list_flush_or_save(0, NULL, IPROUTE_LIST);
+
+	if (matches(*argv, "add") == 0)
+		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL,
+				      argc-1, argv+1);
+	if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0)
+		return iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE,
+				      argc-1, argv+1);
+	if (matches(*argv, "replace") == 0)
+		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE,
+				      argc-1, argv+1);
+	if (matches(*argv, "prepend") == 0)
+		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE,
+				      argc-1, argv+1);
+	if (matches(*argv, "append") == 0)
+		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND,
+				      argc-1, argv+1);
+	if (matches(*argv, "test") == 0)
+		return iproute_modify(RTM_NEWROUTE, NLM_F_EXCL,
+				      argc-1, argv+1);
+	if (matches(*argv, "delete") == 0)
+		return iproute_modify(RTM_DELROUTE, 0,
+				      argc-1, argv+1);
+	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
+	    || matches(*argv, "lst") == 0)
+		return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_LIST);
+	if (matches(*argv, "get") == 0)
+		return iproute_get(argc-1, argv+1);
+	if (matches(*argv, "flush") == 0)
+		return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_FLUSH);
+	if (matches(*argv, "save") == 0)
+		return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_SAVE);
+	if (matches(*argv, "restore") == 0)
+		return iproute_restore();
+	if (matches(*argv, "showdump") == 0)
+		return iproute_showdump();
+	if (matches(*argv, "help") == 0)
+		usage();
+
+	fprintf(stderr,
+		"Command \"%s\" is unknown, try \"ip route help\".\n", *argv);
+	exit(-1);
+}