1 files changed, 687 insertions, 0 deletions

diff --git a/ip/ipntable.c b/ip/ipntable.c
new file mode 100644
index 0000000..4ce02a3
--- /dev/null
+++ b/ip/ipntable.c
@@ -0,0 +1,687 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C)2006 USAGI/WIDE Project
+ *
+ * based on ipneigh.c
+ *
+ * Authors:
+ *	Masahide NAKAMURA @USAGI
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <time.h>
+
+#include "utils.h"
+#include "ip_common.h"
+#include "json_print.h"
+
+static struct
+{
+	int family;
+	int index;
+#define NONE_DEV	(-1)
+	const char *name;
+} filter;
+
+static void usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+	fprintf(stderr,
+		"Usage: ip ntable change name NAME [ dev DEV ]\n"
+		"        [ thresh1 VAL ] [ thresh2 VAL ] [ thresh3 VAL ] [ gc_int MSEC ]\n"
+		"        [ PARMS ]\n"
+		"Usage: ip ntable show [ dev DEV ] [ name NAME ]\n"
+
+		"PARMS := [ base_reachable MSEC ] [ retrans MSEC ] [ gc_stale MSEC ]\n"
+		"         [ delay_probe MSEC ] [ queue LEN ]\n"
+		"         [ app_probes VAL ] [ ucast_probes VAL ] [ mcast_probes VAL ]\n"
+		"         [ anycast_delay MSEC ] [ proxy_delay MSEC ] [ proxy_queue LEN ]\n"
+		"         [ locktime MSEC ]\n"
+		);
+
+	exit(-1);
+}
+
+static int ipntable_modify(int cmd, int flags, int argc, char **argv)
+{
+	struct {
+		struct nlmsghdr	n;
+		struct ndtmsg		ndtm;
+		char			buf[1024];
+	} req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndtmsg)),
+		.n.nlmsg_flags = NLM_F_REQUEST | flags,
+		.n.nlmsg_type = cmd,
+		.ndtm.ndtm_family = preferred_family,
+	};
+	char *namep = NULL;
+	char *threshsp = NULL;
+	char *gc_intp = NULL;
+	char parms_buf[1024] = {};
+	struct rtattr *parms_rta = (struct rtattr *)parms_buf;
+	int parms_change = 0;
+
+	parms_rta->rta_type = NDTA_PARMS;
+	parms_rta->rta_len = RTA_LENGTH(0);
+
+	while (argc > 0) {
+		if (strcmp(*argv, "name") == 0) {
+			int len;
+
+			NEXT_ARG();
+			if (namep)
+				duparg("NAME", *argv);
+
+			namep = *argv;
+			len = strlen(namep) + 1;
+			addattr_l(&req.n, sizeof(req), NDTA_NAME, namep, len);
+		} else if (strcmp(*argv, "thresh1") == 0) {
+			__u32 thresh1;
+
+			NEXT_ARG();
+			threshsp = *argv;
+
+			if (get_u32(&thresh1, *argv, 0))
+				invarg("\"thresh1\" value is invalid", *argv);
+
+			addattr32(&req.n, sizeof(req), NDTA_THRESH1, thresh1);
+		} else if (strcmp(*argv, "thresh2") == 0) {
+			__u32 thresh2;
+
+			NEXT_ARG();
+			threshsp = *argv;
+
+			if (get_u32(&thresh2, *argv, 0))
+				invarg("\"thresh2\" value is invalid", *argv);
+
+			addattr32(&req.n, sizeof(req), NDTA_THRESH2, thresh2);
+		} else if (strcmp(*argv, "thresh3") == 0) {
+			__u32 thresh3;
+
+			NEXT_ARG();
+			threshsp = *argv;
+
+			if (get_u32(&thresh3, *argv, 0))
+				invarg("\"thresh3\" value is invalid", *argv);
+
+			addattr32(&req.n, sizeof(req), NDTA_THRESH3, thresh3);
+		} else if (strcmp(*argv, "gc_int") == 0) {
+			__u64 gc_int;
+
+			NEXT_ARG();
+			gc_intp = *argv;
+
+			if (get_u64(&gc_int, *argv, 0))
+				invarg("\"gc_int\" value is invalid", *argv);
+
+			addattr_l(&req.n, sizeof(req), NDTA_GC_INTERVAL,
+				  &gc_int, sizeof(gc_int));
+		} else if (strcmp(*argv, "dev") == 0) {
+			__u32 ifindex;
+
+			NEXT_ARG();
+			ifindex = ll_name_to_index(*argv);
+			if (!ifindex)
+				return nodev(*argv);
+
+			rta_addattr32(parms_rta, sizeof(parms_buf),
+				      NDTPA_IFINDEX, ifindex);
+		} else if (strcmp(*argv, "base_reachable") == 0) {
+			__u64 breachable;
+
+			NEXT_ARG();
+
+			if (get_u64(&breachable, *argv, 0))
+				invarg("\"base_reachable\" value is invalid", *argv);
+
+			rta_addattr_l(parms_rta, sizeof(parms_buf),
+				      NDTPA_BASE_REACHABLE_TIME,
+				      &breachable, sizeof(breachable));
+			parms_change = 1;
+		} else if (strcmp(*argv, "retrans") == 0) {
+			__u64 retrans;
+
+			NEXT_ARG();
+
+			if (get_u64(&retrans, *argv, 0))
+				invarg("\"retrans\" value is invalid", *argv);
+
+			rta_addattr_l(parms_rta, sizeof(parms_buf),
+				      NDTPA_RETRANS_TIME,
+				      &retrans, sizeof(retrans));
+			parms_change = 1;
+		} else if (strcmp(*argv, "gc_stale") == 0) {
+			__u64 gc_stale;
+
+			NEXT_ARG();
+
+			if (get_u64(&gc_stale, *argv, 0))
+				invarg("\"gc_stale\" value is invalid", *argv);
+
+			rta_addattr_l(parms_rta, sizeof(parms_buf),
+				      NDTPA_GC_STALETIME,
+				      &gc_stale, sizeof(gc_stale));
+			parms_change = 1;
+		} else if (strcmp(*argv, "delay_probe") == 0) {
+			__u64 delay_probe;
+
+			NEXT_ARG();
+
+			if (get_u64(&delay_probe, *argv, 0))
+				invarg("\"delay_probe\" value is invalid", *argv);
+
+			rta_addattr_l(parms_rta, sizeof(parms_buf),
+				      NDTPA_DELAY_PROBE_TIME,
+				      &delay_probe, sizeof(delay_probe));
+			parms_change = 1;
+		} else if (strcmp(*argv, "queue") == 0) {
+			__u32 queue;
+
+			NEXT_ARG();
+
+			if (get_u32(&queue, *argv, 0))
+				invarg("\"queue\" value is invalid", *argv);
+
+			rta_addattr32(parms_rta, sizeof(parms_buf),
+				      NDTPA_QUEUE_LEN, queue);
+			parms_change = 1;
+		} else if (strcmp(*argv, "app_probes") == 0) {
+			__u32 aprobe;
+
+			NEXT_ARG();
+
+			if (get_u32(&aprobe, *argv, 0))
+				invarg("\"app_probes\" value is invalid", *argv);
+
+			rta_addattr32(parms_rta, sizeof(parms_buf),
+				      NDTPA_APP_PROBES, aprobe);
+			parms_change = 1;
+		} else if (strcmp(*argv, "ucast_probes") == 0) {
+			__u32 uprobe;
+
+			NEXT_ARG();
+
+			if (get_u32(&uprobe, *argv, 0))
+				invarg("\"ucast_probes\" value is invalid", *argv);
+
+			rta_addattr32(parms_rta, sizeof(parms_buf),
+				      NDTPA_UCAST_PROBES, uprobe);
+			parms_change = 1;
+		} else if (strcmp(*argv, "mcast_probes") == 0) {
+			__u32 mprobe;
+
+			NEXT_ARG();
+
+			if (get_u32(&mprobe, *argv, 0))
+				invarg("\"mcast_probes\" value is invalid", *argv);
+
+			rta_addattr32(parms_rta, sizeof(parms_buf),
+				      NDTPA_MCAST_PROBES, mprobe);
+			parms_change = 1;
+		} else if (strcmp(*argv, "anycast_delay") == 0) {
+			__u64 anycast_delay;
+
+			NEXT_ARG();
+
+			if (get_u64(&anycast_delay, *argv, 0))
+				invarg("\"anycast_delay\" value is invalid", *argv);
+
+			rta_addattr_l(parms_rta, sizeof(parms_buf),
+				      NDTPA_ANYCAST_DELAY,
+				      &anycast_delay, sizeof(anycast_delay));
+			parms_change = 1;
+		} else if (strcmp(*argv, "proxy_delay") == 0) {
+			__u64 proxy_delay;
+
+			NEXT_ARG();
+
+			if (get_u64(&proxy_delay, *argv, 0))
+				invarg("\"proxy_delay\" value is invalid", *argv);
+
+			rta_addattr_l(parms_rta, sizeof(parms_buf),
+				      NDTPA_PROXY_DELAY,
+				      &proxy_delay, sizeof(proxy_delay));
+			parms_change = 1;
+		} else if (strcmp(*argv, "proxy_queue") == 0) {
+			__u32 pqueue;
+
+			NEXT_ARG();
+
+			if (get_u32(&pqueue, *argv, 0))
+				invarg("\"proxy_queue\" value is invalid", *argv);
+
+			rta_addattr32(parms_rta, sizeof(parms_buf),
+				      NDTPA_PROXY_QLEN, pqueue);
+			parms_change = 1;
+		} else if (strcmp(*argv, "locktime") == 0) {
+			__u64 locktime;
+
+			NEXT_ARG();
+
+			if (get_u64(&locktime, *argv, 0))
+				invarg("\"locktime\" value is invalid", *argv);
+
+			rta_addattr_l(parms_rta, sizeof(parms_buf),
+				      NDTPA_LOCKTIME,
+				      &locktime, sizeof(locktime));
+			parms_change = 1;
+		} else {
+			invarg("unknown", *argv);
+		}
+
+		argc--; argv++;
+	}
+
+	if (!namep)
+		missarg("NAME");
+	if (!threshsp && !gc_intp && !parms_change) {
+		fprintf(stderr, "Not enough information: changeable attributes required.\n");
+		exit(-1);
+	}
+
+	if (parms_rta->rta_len > RTA_LENGTH(0)) {
+		addattr_l(&req.n, sizeof(req), NDTA_PARMS, RTA_DATA(parms_rta),
+			  RTA_PAYLOAD(parms_rta));
+	}
+
+	if (rtnl_talk(&rth, &req.n, NULL) < 0)
+		exit(2);
+
+	return 0;
+}
+
+static const char *ntable_strtime_delta(__u32 msec)
+{
+	static char str[32];
+	struct timeval now = {};
+	time_t t;
+	struct tm *tp;
+
+	if (msec == 0)
+		goto error;
+
+	if (gettimeofday(&now, NULL) < 0) {
+		perror("gettimeofday");
+		goto error;
+	}
+
+	t = now.tv_sec - (msec / 1000);
+	tp = localtime(&t);
+	if (!tp)
+		goto error;
+
+	strftime(str, sizeof(str), "%Y-%m-%d %T", tp);
+
+	return str;
+ error:
+	strcpy(str, "(error)");
+	return str;
+}
+
+static void print_ndtconfig(const struct ndt_config *ndtc)
+{
+
+	print_uint(PRINT_ANY, "key_length",
+		   "    config key_len %u ", ndtc->ndtc_key_len);
+	print_uint(PRINT_ANY, "entry_size",
+		   "entry_size %u ", ndtc->ndtc_entry_size);
+	print_uint(PRINT_ANY, "entries", "entries %u ", ndtc->ndtc_entries);
+
+	print_nl();
+
+	print_string(PRINT_ANY, "last_flush",
+		     "        last_flush %s ",
+		     ntable_strtime_delta(ndtc->ndtc_last_flush));
+	print_string(PRINT_ANY, "last_rand",
+		     "last_rand %s ",
+		     ntable_strtime_delta(ndtc->ndtc_last_rand));
+
+	print_nl();
+
+	print_uint(PRINT_ANY, "hash_rnd",
+		   "        hash_rnd %u ", ndtc->ndtc_hash_rnd);
+	print_0xhex(PRINT_ANY, "hash_mask",
+		    "hash_mask %08llx ", ndtc->ndtc_hash_mask);
+
+	print_uint(PRINT_ANY, "hash_chain_gc",
+		   "hash_chain_gc %u ", ndtc->ndtc_hash_chain_gc);
+	print_uint(PRINT_ANY, "proxy_qlen",
+		   "proxy_qlen %u ", ndtc->ndtc_proxy_qlen);
+
+	print_nl();
+}
+
+static void print_ndtparams(struct rtattr *tpb[])
+{
+
+	if (tpb[NDTPA_IFINDEX]) {
+		__u32 ifindex = rta_getattr_u32(tpb[NDTPA_IFINDEX]);
+
+		print_string(PRINT_FP, NULL, "    dev ", NULL);
+		print_color_string(PRINT_ANY, COLOR_IFNAME,
+				   "dev", "%s ", ll_index_to_name(ifindex));
+		print_nl();
+	}
+
+	print_string(PRINT_FP, NULL, "    ", NULL);
+	if (tpb[NDTPA_REFCNT]) {
+		__u32 refcnt = rta_getattr_u32(tpb[NDTPA_REFCNT]);
+
+		print_uint(PRINT_ANY, "refcnt", "refcnt %u ", refcnt);
+	}
+
+	if (tpb[NDTPA_REACHABLE_TIME]) {
+		__u64 reachable = rta_getattr_u64(tpb[NDTPA_REACHABLE_TIME]);
+
+		print_u64(PRINT_ANY, "reachable",
+			   "reachable %llu ", reachable);
+	}
+
+	if (tpb[NDTPA_BASE_REACHABLE_TIME]) {
+		__u64 breachable
+			= rta_getattr_u64(tpb[NDTPA_BASE_REACHABLE_TIME]);
+
+		print_u64(PRINT_ANY, "base_reachable",
+			   "base_reachable %llu ", breachable);
+	}
+
+	if (tpb[NDTPA_RETRANS_TIME]) {
+		__u64 retrans = rta_getattr_u64(tpb[NDTPA_RETRANS_TIME]);
+
+		print_u64(PRINT_ANY, "retrans", "retrans %llu ", retrans);
+	}
+
+	print_string(PRINT_FP, NULL, "%s    ", _SL_);
+
+	if (tpb[NDTPA_GC_STALETIME]) {
+		__u64 gc_stale = rta_getattr_u64(tpb[NDTPA_GC_STALETIME]);
+
+		print_u64(PRINT_ANY, "gc_stale", "gc_stale %llu ", gc_stale);
+	}
+
+	if (tpb[NDTPA_DELAY_PROBE_TIME]) {
+		__u64 delay_probe
+			= rta_getattr_u64(tpb[NDTPA_DELAY_PROBE_TIME]);
+
+		print_u64(PRINT_ANY, "delay_probe",
+			   "delay_probe %llu ", delay_probe);
+	}
+
+	if (tpb[NDTPA_QUEUE_LEN]) {
+		__u32 queue = rta_getattr_u32(tpb[NDTPA_QUEUE_LEN]);
+
+		print_uint(PRINT_ANY, "queue", "queue %u ", queue);
+	}
+
+	print_string(PRINT_FP, NULL, "%s    ", _SL_);
+
+	if (tpb[NDTPA_APP_PROBES]) {
+		__u32 aprobe = rta_getattr_u32(tpb[NDTPA_APP_PROBES]);
+
+		print_uint(PRINT_ANY, "app_probes", "app_probes %u ", aprobe);
+	}
+
+	if (tpb[NDTPA_UCAST_PROBES]) {
+		__u32 uprobe = rta_getattr_u32(tpb[NDTPA_UCAST_PROBES]);
+
+		print_uint(PRINT_ANY, "ucast_probes",
+			   "ucast_probes %u ", uprobe);
+	}
+
+	if (tpb[NDTPA_MCAST_PROBES]) {
+		__u32 mprobe = rta_getattr_u32(tpb[NDTPA_MCAST_PROBES]);
+
+		print_uint(PRINT_ANY, "mcast_probes",
+			   "mcast_probes %u ", mprobe);
+	}
+
+	print_string(PRINT_FP, NULL, "%s    ", _SL_);
+
+	if (tpb[NDTPA_ANYCAST_DELAY]) {
+		__u64 anycast_delay = rta_getattr_u64(tpb[NDTPA_ANYCAST_DELAY]);
+
+		print_u64(PRINT_ANY, "anycast_delay",
+			   "anycast_delay %llu ", anycast_delay);
+	}
+
+	if (tpb[NDTPA_PROXY_DELAY]) {
+		__u64 proxy_delay = rta_getattr_u64(tpb[NDTPA_PROXY_DELAY]);
+
+		print_u64(PRINT_ANY, "proxy_delay",
+			   "proxy_delay %llu ", proxy_delay);
+	}
+
+	if (tpb[NDTPA_PROXY_QLEN]) {
+		__u32 pqueue = rta_getattr_u32(tpb[NDTPA_PROXY_QLEN]);
+
+		print_uint(PRINT_ANY, "proxy_queue", "proxy_queue %u ", pqueue);
+	}
+
+	if (tpb[NDTPA_LOCKTIME]) {
+		__u64 locktime = rta_getattr_u64(tpb[NDTPA_LOCKTIME]);
+
+		print_u64(PRINT_ANY, "locktime", "locktime %llu ", locktime);
+	}
+
+	print_nl();
+}
+
+static void print_ndtstats(const struct ndt_stats *ndts)
+{
+
+	print_string(PRINT_FP, NULL, "    stats ", NULL);
+
+	print_u64(PRINT_ANY, "allocs", "allocs %llu ", ndts->ndts_allocs);
+	print_u64(PRINT_ANY, "destroys", "destroys %llu ",
+		   ndts->ndts_destroys);
+	print_u64(PRINT_ANY, "hash_grows", "hash_grows %llu ",
+		   ndts->ndts_hash_grows);
+
+	print_string(PRINT_FP, NULL, "%s    ", _SL_);
+
+	print_u64(PRINT_ANY, "res_failed", "res_failed %llu ",
+		   ndts->ndts_res_failed);
+	print_u64(PRINT_ANY, "lookups", "lookups %llu ", ndts->ndts_lookups);
+	print_u64(PRINT_ANY, "hits", "hits %llu ", ndts->ndts_hits);
+
+	print_string(PRINT_FP, NULL, "%s    ", _SL_);
+
+	print_u64(PRINT_ANY, "rcv_probes_mcast", "rcv_probes_mcast %llu ",
+		   ndts->ndts_rcv_probes_mcast);
+	print_u64(PRINT_ANY, "rcv_probes_ucast", "rcv_probes_ucast %llu ",
+		   ndts->ndts_rcv_probes_ucast);
+
+	print_string(PRINT_FP, NULL, "%s    ", _SL_);
+
+	print_u64(PRINT_ANY, "periodic_gc_runs", "periodic_gc_runs %llu ",
+		   ndts->ndts_periodic_gc_runs);
+	print_u64(PRINT_ANY, "forced_gc_runs", "forced_gc_runs %llu ",
+		   ndts->ndts_forced_gc_runs);
+
+	print_string(PRINT_FP, NULL, "%s    ", _SL_);
+
+	print_u64(PRINT_ANY, "table_fulls", "table_fulls %llu ",
+		  ndts->ndts_table_fulls);
+
+	print_nl();
+}
+
+static int print_ntable(struct nlmsghdr *n, void *arg)
+{
+	FILE *fp = (FILE *)arg;
+	struct ndtmsg *ndtm = NLMSG_DATA(n);
+	int len = n->nlmsg_len;
+	struct rtattr *tb[NDTA_MAX+1];
+	struct rtattr *tpb[NDTPA_MAX+1];
+	int ret;
+
+	if (n->nlmsg_type != RTM_NEWNEIGHTBL) {
+		fprintf(stderr, "Not NEIGHTBL: %08x %08x %08x\n",
+			n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
+		return 0;
+	}
+	len -= NLMSG_LENGTH(sizeof(*ndtm));
+	if (len < 0) {
+		fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
+		return -1;
+	}
+
+	if (preferred_family && preferred_family != ndtm->ndtm_family)
+		return 0;
+
+	parse_rtattr(tb, NDTA_MAX, NDTA_RTA(ndtm),
+		     n->nlmsg_len - NLMSG_LENGTH(sizeof(*ndtm)));
+
+	if (tb[NDTA_NAME]) {
+		const char *name = rta_getattr_str(tb[NDTA_NAME]);
+
+		if (filter.name && strcmp(filter.name, name))
+			return 0;
+	}
+
+	if (tb[NDTA_PARMS]) {
+		parse_rtattr(tpb, NDTPA_MAX, RTA_DATA(tb[NDTA_PARMS]),
+			     RTA_PAYLOAD(tb[NDTA_PARMS]));
+
+		if (tpb[NDTPA_IFINDEX]) {
+			__u32 ifindex = rta_getattr_u32(tpb[NDTPA_IFINDEX]);
+
+			if (filter.index && filter.index != ifindex)
+				return 0;
+		} else {
+			if (filter.index && filter.index != NONE_DEV)
+				return 0;
+		}
+	}
+
+	open_json_object(NULL);
+	print_string(PRINT_ANY, "family",
+		     "%s ", family_name(ndtm->ndtm_family));
+
+	if (tb[NDTA_NAME]) {
+		const char *name = rta_getattr_str(tb[NDTA_NAME]);
+
+		print_string(PRINT_ANY, "name", "%s ", name);
+	}
+
+	print_nl();
+
+	ret = (tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || tb[NDTA_THRESH3] ||
+	       tb[NDTA_GC_INTERVAL]);
+	if (ret)
+		print_string(PRINT_FP, NULL, "    ", NULL);
+
+	if (tb[NDTA_THRESH1]) {
+		__u32 thresh1 = rta_getattr_u32(tb[NDTA_THRESH1]);
+
+		print_uint(PRINT_ANY, "thresh1", "thresh1 %u ", thresh1);
+	}
+
+	if (tb[NDTA_THRESH2]) {
+		__u32 thresh2 = rta_getattr_u32(tb[NDTA_THRESH2]);
+
+		print_uint(PRINT_ANY, "thresh2", "thresh2 %u ", thresh2);
+	}
+
+	if (tb[NDTA_THRESH3]) {
+		__u32 thresh3 = rta_getattr_u32(tb[NDTA_THRESH3]);
+
+		print_uint(PRINT_ANY, "thresh3", "thresh3 %u ", thresh3);
+	}
+
+	if (tb[NDTA_GC_INTERVAL]) {
+		__u64 gc_int = rta_getattr_u64(tb[NDTA_GC_INTERVAL]);
+
+		print_u64(PRINT_ANY, "gc_interval", "gc_int %llu ", gc_int);
+	}
+
+	if (ret)
+		print_nl();
+
+	if (tb[NDTA_CONFIG] && show_stats)
+		print_ndtconfig(RTA_DATA(tb[NDTA_CONFIG]));
+
+	if (tb[NDTA_PARMS])
+		print_ndtparams(tpb);
+
+	if (tb[NDTA_STATS] && show_stats)
+		print_ndtstats(RTA_DATA(tb[NDTA_STATS]));
+
+	print_string(PRINT_FP, NULL, "\n", "");
+	close_json_object();
+	fflush(fp);
+
+	return 0;
+}
+
+static void ipntable_reset_filter(void)
+{
+	memset(&filter, 0, sizeof(filter));
+}
+
+static int ipntable_show(int argc, char **argv)
+{
+	ipntable_reset_filter();
+
+	filter.family = preferred_family;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+
+			if (strcmp("none", *argv) == 0)
+				filter.index = NONE_DEV;
+			else if ((filter.index = ll_name_to_index(*argv)) == 0)
+				invarg("\"DEV\" is invalid", *argv);
+		} else if (strcmp(*argv, "name") == 0) {
+			NEXT_ARG();
+
+			filter.name = *argv;
+		} else
+			invarg("unknown", *argv);
+
+		argc--; argv++;
+	}
+
+	if (rtnl_neightbldump_req(&rth, preferred_family) < 0) {
+		perror("Cannot send dump request");
+		exit(1);
+	}
+
+	new_json_obj(json);
+	if (rtnl_dump_filter(&rth, print_ntable, stdout) < 0) {
+		fprintf(stderr, "Dump terminated\n");
+		exit(1);
+	}
+	delete_json_obj();
+
+	return 0;
+}
+
+int do_ipntable(int argc, char **argv)
+{
+	ll_init_map(&rth);
+
+	if (argc > 0) {
+		if (matches(*argv, "change") == 0 ||
+		    matches(*argv, "chg") == 0)
+			return ipntable_modify(RTM_SETNEIGHTBL,
+					       NLM_F_REPLACE,
+					       argc-1, argv+1);
+		if (matches(*argv, "show") == 0 ||
+		    matches(*argv, "lst") == 0 ||
+		    matches(*argv, "list") == 0)
+			return ipntable_show(argc-1, argv+1);
+		if (matches(*argv, "help") == 0)
+			usage();
+	} else
+		return ipntable_show(0, NULL);
+
+	fprintf(stderr, "Command \"%s\" is unknown, try \"ip ntable help\".\n", *argv);
+	exit(-1);
+}