[mirror_iproute2.git] / ip / ipneigh.c

/*
 * ipneigh.c		"ip neigh".
 *
 *		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 <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>

#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#include "json_print.h"

#define NUD_VALID	(NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
#define MAX_ROUNDS	10

static struct
{
	int family;
	int index;
	int state;
	int unused_only;
	inet_prefix pfx;
	int flushed;
	char *flushb;
	int flushp;
	int flushe;
	int master;
} filter;

static void usage(void) __attribute__((noreturn));

static void usage(void)
{
	fprintf(stderr, "Usage: ip neigh { add | del | change | replace }\n"
			"                { ADDR [ lladdr LLADDR ] [ nud STATE ] | proxy ADDR } [ dev DEV ]\n");
	fprintf(stderr, "                                 [ router ] [ extern_learn ]\n\n");
	fprintf(stderr, "       ip neigh { show | flush } [ proxy ] [ to PREFIX ] [ dev DEV ] [ nud STATE ]\n");
	fprintf(stderr, "                                 [ vrf NAME ]\n\n");
	fprintf(stderr, "STATE := { permanent | noarp | stale | reachable | none |\n"
			"           incomplete | delay | probe | failed }\n");
	exit(-1);
}

static int nud_state_a2n(unsigned int *state, const char *arg)
{
	if (matches(arg, "permanent") == 0)
		*state = NUD_PERMANENT;
	else if (matches(arg, "reachable") == 0)
		*state = NUD_REACHABLE;
	else if (strcmp(arg, "noarp") == 0)
		*state = NUD_NOARP;
	else if (strcmp(arg, "none") == 0)
		*state = NUD_NONE;
	else if (strcmp(arg, "stale") == 0)
		*state = NUD_STALE;
	else if (strcmp(arg, "incomplete") == 0)
		*state = NUD_INCOMPLETE;
	else if (strcmp(arg, "delay") == 0)
		*state = NUD_DELAY;
	else if (strcmp(arg, "probe") == 0)
		*state = NUD_PROBE;
	else if (matches(arg, "failed") == 0)
		*state = NUD_FAILED;
	else {
		if (get_unsigned(state, arg, 0))
			return -1;
		if (*state >= 0x100 || (*state&((*state)-1)))
			return -1;
	}
	return 0;
}

static int flush_update(void)
{
	if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
		perror("Failed to send flush request");
		return -1;
	}
	filter.flushp = 0;
	return 0;
}


static int ipneigh_modify(int cmd, int flags, int argc, char **argv)
{
	struct {
		struct nlmsghdr	n;
		struct ndmsg		ndm;
		char			buf[256];
	} req = {
		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
		.n.nlmsg_flags = NLM_F_REQUEST | flags,
		.n.nlmsg_type = cmd,
		.ndm.ndm_family = preferred_family,
		.ndm.ndm_state = NUD_PERMANENT,
	};
	char  *dev = NULL;
	int dst_ok = 0;
	int dev_ok = 0;
	int lladdr_ok = 0;
	char *lla = NULL;
	inet_prefix dst;

	while (argc > 0) {
		if (matches(*argv, "lladdr") == 0) {
			NEXT_ARG();
			if (lladdr_ok)
				duparg("lladdr", *argv);
			lla = *argv;
			lladdr_ok = 1;
		} else if (strcmp(*argv, "nud") == 0) {
			unsigned int state;

			NEXT_ARG();
			if (nud_state_a2n(&state, *argv))
				invarg("nud state is bad", *argv);
			req.ndm.ndm_state = state;
		} else if (matches(*argv, "proxy") == 0) {
			NEXT_ARG();
			if (matches(*argv, "help") == 0)
				usage();
			if (dst_ok)
				duparg("address", *argv);
			get_addr(&dst, *argv, preferred_family);
			dst_ok = 1;
			dev_ok = 1;
			req.ndm.ndm_flags |= NTF_PROXY;
		} else if (strcmp(*argv, "router") == 0) {
			req.ndm.ndm_flags |= NTF_ROUTER;
		} else if (matches(*argv, "extern_learn") == 0) {
			req.ndm.ndm_flags |= NTF_EXT_LEARNED;
		} else if (strcmp(*argv, "dev") == 0) {
			NEXT_ARG();
			dev = *argv;
			dev_ok = 1;
		} else {
			if (strcmp(*argv, "to") == 0) {
				NEXT_ARG();
			}
			if (matches(*argv, "help") == 0) {
				NEXT_ARG();
			}
			if (dst_ok)
				duparg2("to", *argv);
			get_addr(&dst, *argv, preferred_family);
			dst_ok = 1;
		}
		argc--; argv++;
	}
	if (!dev_ok || !dst_ok || dst.family == AF_UNSPEC) {
		fprintf(stderr, "Device and destination are required arguments.\n");
		exit(-1);
	}
	req.ndm.ndm_family = dst.family;
	if (addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen) < 0)
		return -1;

	if (lla && strcmp(lla, "null")) {
		char llabuf[20];
		int l;

		l = ll_addr_a2n(llabuf, sizeof(llabuf), lla);
		if (l < 0)
			return -1;

		if (addattr_l(&req.n, sizeof(req), NDA_LLADDR, llabuf, l) < 0)
			return -1;
	}

	ll_init_map(&rth);

	if (dev) {
		req.ndm.ndm_ifindex = ll_name_to_index(dev);
		if (!req.ndm.ndm_ifindex)
			return nodev(dev);
	}

	if (rtnl_talk(&rth, &req.n, NULL) < 0)
		exit(2);

	return 0;
}

static void print_cacheinfo(const struct nda_cacheinfo *ci)
{
	static int hz;

	if (!hz)
		hz = get_user_hz();

	if (ci->ndm_refcnt)
		print_uint(PRINT_ANY, "refcnt",
				" ref %u", ci->ndm_refcnt);

	print_uint(PRINT_ANY, "used", " used %u", ci->ndm_used / hz);
	print_uint(PRINT_ANY, "confirmed", "/%u", ci->ndm_confirmed / hz);
	print_uint(PRINT_ANY, "updated", "/%u", ci->ndm_updated / hz);
}

static void print_neigh_state(unsigned int nud)
{

	open_json_array(PRINT_JSON,
			is_json_context() ?  "state" : "");

#define PRINT_FLAG(f)						\
	if (nud & NUD_##f) {					\
		nud &= ~NUD_##f;				\
		print_string(PRINT_ANY, NULL, " %s", #f);	\
	}

	PRINT_FLAG(INCOMPLETE);
	PRINT_FLAG(REACHABLE);
	PRINT_FLAG(STALE);
	PRINT_FLAG(DELAY);
	PRINT_FLAG(PROBE);
	PRINT_FLAG(FAILED);
	PRINT_FLAG(NOARP);
	PRINT_FLAG(PERMANENT);
#undef PRINT_FLAG

	close_json_array(PRINT_JSON, NULL);
}

int print_neigh(struct nlmsghdr *n, void *arg)
{
	FILE *fp = (FILE *)arg;
	struct ndmsg *r = NLMSG_DATA(n);
	int len = n->nlmsg_len;
	struct rtattr *tb[NDA_MAX+1];
	static int logit = 1;

	if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH &&
	    n->nlmsg_type != RTM_GETNEIGH) {
		fprintf(stderr, "Not RTM_NEWNEIGH: %08x %08x %08x\n",
			n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);

		return 0;
	}
	len -= NLMSG_LENGTH(sizeof(*r));
	if (len < 0) {
		fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
		return -1;
	}

	if (filter.flushb && n->nlmsg_type != RTM_NEWNEIGH)
		return 0;

	if (filter.family && filter.family != r->ndm_family)
		return 0;
	if (filter.index && filter.index != r->ndm_ifindex)
		return 0;
	if (!(filter.state&r->ndm_state) &&
	    !(r->ndm_flags & NTF_PROXY) &&
	    !(r->ndm_flags & NTF_EXT_LEARNED) &&
	    (r->ndm_state || !(filter.state&0x100)) &&
	    (r->ndm_family != AF_DECnet))
		return 0;

	if (filter.master && !(n->nlmsg_flags & NLM_F_DUMP_FILTERED)) {
		if (logit) {
			logit = 0;
			fprintf(fp,
				"\nWARNING: Kernel does not support filtering by master device\n\n");
		}
	}

	parse_rtattr(tb, NDA_MAX, NDA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));

	if (inet_addr_match_rta(&filter.pfx, tb[NDA_DST]))
		return 0;

	if (filter.unused_only && tb[NDA_CACHEINFO]) {
		struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);

		if (ci->ndm_refcnt)
			return 0;
	}

	if (filter.flushb) {
		struct nlmsghdr *fn;

		if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
			if (flush_update())
				return -1;
		}
		fn = (struct nlmsghdr *)(filter.flushb + NLMSG_ALIGN(filter.flushp));
		memcpy(fn, n, n->nlmsg_len);
		fn->nlmsg_type = RTM_DELNEIGH;
		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_DELNEIGH)
		print_bool(PRINT_ANY, "deleted", "Deleted ", true);
	else if (n->nlmsg_type == RTM_GETNEIGH)
		print_null(PRINT_ANY, "miss", "%s ", "miss");

	if (tb[NDA_DST]) {
		const char *dst;

		dst = format_host_rta(r->ndm_family, tb[NDA_DST]);
		print_color_string(PRINT_ANY,
				   ifa_family_color(r->ndm_family),
				   "dst", "%s ", dst);
	}

	if (!filter.index && r->ndm_ifindex) {
		if (!is_json_context())
			fprintf(fp, "dev ");

		print_color_string(PRINT_ANY, COLOR_IFNAME,
				   "dev", "%s ",
				   ll_index_to_name(r->ndm_ifindex));
	}

	if (tb[NDA_LLADDR]) {
		const char *lladdr;
		SPRINT_BUF(b1);

		lladdr = ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
				     RTA_PAYLOAD(tb[NDA_LLADDR]),
				     ll_index_to_type(r->ndm_ifindex),
				     b1, sizeof(b1));

		if (!is_json_context())
			fprintf(fp, "lladdr ");

		print_color_string(PRINT_ANY, COLOR_MAC,
				   "lladdr", "%s", lladdr);
	}

	if (r->ndm_flags & NTF_ROUTER)
		print_null(PRINT_ANY, "router", " %s", "router");

	if (r->ndm_flags & NTF_PROXY)
		print_null(PRINT_ANY, "proxy", " %s", "proxy");

	if (r->ndm_flags & NTF_EXT_LEARNED)
		print_null(PRINT_ANY, "extern_learn", " %s ", "extern_learn");

	if (show_stats) {
		if (tb[NDA_CACHEINFO])
			print_cacheinfo(RTA_DATA(tb[NDA_CACHEINFO]));

		if (tb[NDA_PROBES])
			print_uint(PRINT_ANY, "probes", " probes %u",
				   rta_getattr_u32(tb[NDA_PROBES]));
	}

	if (r->ndm_state)
		print_neigh_state(r->ndm_state);

	print_string(PRINT_FP, NULL, "\n", "");
	close_json_object();
	fflush(stdout);

	return 0;
}

void ipneigh_reset_filter(int ifindex)
{
	memset(&filter, 0, sizeof(filter));
	filter.state = ~0;
	filter.index = ifindex;
}

static int do_show_or_flush(int argc, char **argv, int flush)
{
	struct {
		struct nlmsghdr	n;
		struct ndmsg		ndm;
		char			buf[256];
	} req = {
		.n.nlmsg_type = RTM_GETNEIGH,
		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
	};
	char *filter_dev = NULL;
	int state_given = 0;

	ipneigh_reset_filter(0);

	if (!filter.family)
		filter.family = preferred_family;

	if (flush) {
		if (argc <= 0) {
			fprintf(stderr, "Flush requires arguments.\n");
			return -1;
		}
		filter.state = ~(NUD_PERMANENT|NUD_NOARP);
	} else
		filter.state = 0xFF & ~NUD_NOARP;

	while (argc > 0) {
		if (strcmp(*argv, "dev") == 0) {
			NEXT_ARG();
			if (filter_dev)
				duparg("dev", *argv);
			filter_dev = *argv;
		} else if (strcmp(*argv, "master") == 0) {
			int ifindex;

			NEXT_ARG();
			ifindex = ll_name_to_index(*argv);
			if (!ifindex)
				invarg("Device does not exist\n", *argv);
			addattr32(&req.n, sizeof(req), NDA_MASTER, ifindex);
			filter.master = ifindex;
		} 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);
			addattr32(&req.n, sizeof(req), NDA_MASTER, ifindex);
			filter.master = ifindex;
		} else if (strcmp(*argv, "unused") == 0) {
			filter.unused_only = 1;
		} else if (strcmp(*argv, "nud") == 0) {
			unsigned int state;

			NEXT_ARG();
			if (!state_given) {
				state_given = 1;
				filter.state = 0;
			}
			if (nud_state_a2n(&state, *argv)) {
				if (strcmp(*argv, "all") != 0)
					invarg("nud state is bad", *argv);
				state = ~0;
				if (flush)
					state &= ~NUD_NOARP;
			}
			if (state == 0)
				state = 0x100;
			filter.state |= state;
		} else if (strcmp(*argv, "proxy") == 0)
			req.ndm.ndm_flags = NTF_PROXY;
		else {
			if (strcmp(*argv, "to") == 0) {
				NEXT_ARG();
			}
			if (matches(*argv, "help") == 0)
				usage();
			if (get_prefix(&filter.pfx, *argv, filter.family))
				invarg("to value is invalid\n", *argv);
			if (filter.family == AF_UNSPEC)
				filter.family = filter.pfx.family;
		}
		argc--; argv++;
	}

	ll_init_map(&rth);

	if (filter_dev) {
		filter.index = ll_name_to_index(filter_dev);
		if (!filter.index)
			return nodev(filter_dev);
		addattr32(&req.n, sizeof(req), NDA_IFINDEX, filter.index);
	}

	req.ndm.ndm_family = filter.family;

	if (flush) {
		int round = 0;
		char flushb[4096-512];

		filter.flushb = flushb;
		filter.flushp = 0;
		filter.flushe = sizeof(flushb);

		while (round < MAX_ROUNDS) {
			if (rtnl_dump_request_n(&rth, &req.n) < 0) {
				perror("Cannot send dump request");
				exit(1);
			}
			filter.flushed = 0;
			if (rtnl_dump_filter(&rth, print_neigh, stdout) < 0) {
				fprintf(stderr, "Flush terminated\n");
				exit(1);
			}
			if (filter.flushed == 0) {
				if (show_stats) {
					if (round == 0)
						printf("Nothing to flush.\n");
					else
						printf("*** Flush is complete after %d round%s ***\n", round, round > 1?"s":"");
				}
				fflush(stdout);
				return 0;
			}
			round++;
			if (flush_update() < 0)
				exit(1);
			if (show_stats) {
				printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
				fflush(stdout);
			}
			filter.state &= ~NUD_FAILED;
		}
		printf("*** Flush not complete bailing out after %d rounds\n",
			MAX_ROUNDS);
		return 1;
	}

	if (rtnl_dump_request_n(&rth, &req.n) < 0) {
		perror("Cannot send dump request");
		exit(1);
	}

	new_json_obj(json);
	if (rtnl_dump_filter(&rth, print_neigh, stdout) < 0) {
		fprintf(stderr, "Dump terminated\n");
		exit(1);
	}
	delete_json_obj();

	return 0;
}

int do_ipneigh(int argc, char **argv)
{
	if (argc > 0) {
		if (matches(*argv, "add") == 0)
			return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
		if (matches(*argv, "change") == 0 ||
		    strcmp(*argv, "chg") == 0)
			return ipneigh_modify(RTM_NEWNEIGH, NLM_F_REPLACE, argc-1, argv+1);
		if (matches(*argv, "replace") == 0)
			return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
		if (matches(*argv, "delete") == 0)
			return ipneigh_modify(RTM_DELNEIGH, 0, argc-1, argv+1);
		if (matches(*argv, "get") == 0) {
			fprintf(stderr, "Sorry, \"neigh get\" is not implemented :-(\n");
			return -1;
		}
		if (matches(*argv, "show") == 0 ||
		    matches(*argv, "lst") == 0 ||
		    matches(*argv, "list") == 0)
			return do_show_or_flush(argc-1, argv+1, 0);
		if (matches(*argv, "flush") == 0)
			return do_show_or_flush(argc-1, argv+1, 1);
		if (matches(*argv, "help") == 0)
			usage();
	} else
		return do_show_or_flush(0, NULL, 0);

	fprintf(stderr, "Command \"%s\" is unknown, try \"ip neigh help\".\n", *argv);
	exit(-1);
}
Commit	Line	Data
aba5acdf SH	1	/*
	2	* ipneigh.c "ip neigh".
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	10	*
aba5acdf SH	11	*/
	12
	13	#include <stdio.h>
	14	#include <stdlib.h>
	15	#include <unistd.h>
aba5acdf SH	16	#include <fcntl.h>
	17	#include <string.h>
	18	#include <sys/time.h>
aba5acdf SH	19	#include <sys/socket.h>
	20	#include <netinet/in.h>
	21	#include <netinet/ip.h>
	22
	23	#include "rt_names.h"
	24	#include "utils.h"
	25	#include "ip_common.h"
aac7f725	26	#include "json_print.h"
aba5acdf SH	27
aba5acdf SH	28	#define NUD_VALID (NUD_PERMANENT\|NUD_NOARP\|NUD_REACHABLE\|NUD_PROBE\|NUD_STALE\|NUD_DELAY)
66081849	29	#define MAX_ROUNDS 10
aba5acdf SH	30
	31	static struct
	32	{
	33	int family;
56f5daac	34	int index;
aba5acdf SH	35	int state;
	36	int unused_only;
	37	inet_prefix pfx;
	38	int flushed;
	39	char *flushb;
	40	int flushp;
	41	int flushe;
0d238ca2	42	int master;
aba5acdf SH	43	} filter;
	44
	45	static void usage(void) __attribute__((noreturn));
	46
	47	static void usage(void)
	48	{
03a0cf20 PS	49	fprintf(stderr, "Usage: ip neigh { add \| del \| change \| replace }\n"
03a0cf20 PS	50	" { ADDR [ lladdr LLADDR ] [ nud STATE ] \| proxy ADDR } [ dev DEV ]\n");
4c45b684	51	fprintf(stderr, " [ router ] [ extern_learn ]\n\n");
5db1adae DA	52	fprintf(stderr, " ip neigh { show \| flush } [ proxy ] [ to PREFIX ] [ dev DEV ] [ nud STATE ]\n");
5db1adae DA	53	fprintf(stderr, " [ vrf NAME ]\n\n");
03a0cf20	54	fprintf(stderr, "STATE := { permanent \| noarp \| stale \| reachable \| none \|\n"
56f5daac	55	" incomplete \| delay \| probe \| failed }\n");
aba5acdf SH	56	exit(-1);
	57	}
	58
56f5daac	59	static int nud_state_a2n(unsigned int state, const char arg)
aba5acdf SH	60	{
	61	if (matches(arg, "permanent") == 0)
	62	*state = NUD_PERMANENT;
	63	else if (matches(arg, "reachable") == 0)
	64	*state = NUD_REACHABLE;
	65	else if (strcmp(arg, "noarp") == 0)
	66	*state = NUD_NOARP;
	67	else if (strcmp(arg, "none") == 0)
	68	*state = NUD_NONE;
	69	else if (strcmp(arg, "stale") == 0)
	70	*state = NUD_STALE;
	71	else if (strcmp(arg, "incomplete") == 0)
	72	*state = NUD_INCOMPLETE;
	73	else if (strcmp(arg, "delay") == 0)
	74	*state = NUD_DELAY;
	75	else if (strcmp(arg, "probe") == 0)
	76	*state = NUD_PROBE;
	77	else if (matches(arg, "failed") == 0)
	78	*state = NUD_FAILED;
	79	else {
	80	if (get_unsigned(state, arg, 0))
	81	return -1;
56f5daac	82	if (state >= 0x100 \|\| (state&((*state)-1)))
aba5acdf SH	83	return -1;
	84	}
	85	return 0;
	86	}
	87
aba5acdf SH	88	static int flush_update(void)
aba5acdf SH	89	{
f31a37f7	90	if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
1fb0a998	91	perror("Failed to send flush request");
aba5acdf SH	92	return -1;
	93	}
	94	filter.flushp = 0;
	95	return 0;
	96	}
	97
	98
	99	static int ipneigh_modify(int cmd, int flags, int argc, char **argv)
	100	{
aba5acdf	101	struct {
4806867a SH	102	struct nlmsghdr n;
4806867a SH	103	struct ndmsg ndm;
56f5daac	104	char buf[256];
d17b136f PS	105	} req = {
	106	.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
	107	.n.nlmsg_flags = NLM_F_REQUEST \| flags,
	108	.n.nlmsg_type = cmd,
	109	.ndm.ndm_family = preferred_family,
	110	.ndm.ndm_state = NUD_PERMANENT,
	111	};
e834eb8e	112	char *dev = NULL;
aba5acdf	113	int dst_ok = 0;
e834eb8e	114	int dev_ok = 0;
aba5acdf	115	int lladdr_ok = 0;
56f5daac	116	char *lla = NULL;
aba5acdf SH	117	inet_prefix dst;
aba5acdf SH	118
aba5acdf SH	119	while (argc > 0) {
	120	if (matches(*argv, "lladdr") == 0) {
	121	NEXT_ARG();
	122	if (lladdr_ok)
	123	duparg("lladdr", *argv);
	124	lla = *argv;
	125	lladdr_ok = 1;
	126	} else if (strcmp(*argv, "nud") == 0) {
56f5daac SH	127	unsigned int state;
56f5daac SH	128
aba5acdf SH	129	NEXT_ARG();
	130	if (nud_state_a2n(&state, *argv))
	131	invarg("nud state is bad", *argv);
	132	req.ndm.ndm_state = state;
	133	} else if (matches(*argv, "proxy") == 0) {
	134	NEXT_ARG();
	135	if (matches(*argv, "help") == 0)
	136	usage();
	137	if (dst_ok)
	138	duparg("address", *argv);
	139	get_addr(&dst, *argv, preferred_family);
	140	dst_ok = 1;
e834eb8e	141	dev_ok = 1;
aba5acdf	142	req.ndm.ndm_flags \|= NTF_PROXY;
c2cd14ac RP	143	} else if (strcmp(*argv, "router") == 0) {
c2cd14ac RP	144	req.ndm.ndm_flags \|= NTF_ROUTER;
4c45b684 RP	145	} else if (matches(*argv, "extern_learn") == 0) {
4c45b684 RP	146	req.ndm.ndm_flags \|= NTF_EXT_LEARNED;
aba5acdf SH	147	} else if (strcmp(*argv, "dev") == 0) {
aba5acdf SH	148	NEXT_ARG();
e834eb8e KK	149	dev = *argv;
e834eb8e KK	150	dev_ok = 1;
aba5acdf SH	151	} else {
	152	if (strcmp(*argv, "to") == 0) {
	153	NEXT_ARG();
	154	}
	155	if (matches(*argv, "help") == 0) {
	156	NEXT_ARG();
	157	}
	158	if (dst_ok)
	159	duparg2("to", *argv);
	160	get_addr(&dst, *argv, preferred_family);
	161	dst_ok = 1;
	162	}
	163	argc--; argv++;
	164	}
e834eb8e	165	if (!dev_ok \|\| !dst_ok \|\| dst.family == AF_UNSPEC) {
aba5acdf SH	166	fprintf(stderr, "Device and destination are required arguments.\n");
	167	exit(-1);
	168	}
	169	req.ndm.ndm_family = dst.family;
542b0cc7 SH	170	if (addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen) < 0)
542b0cc7 SH	171	return -1;
aba5acdf SH	172
aba5acdf SH	173	if (lla && strcmp(lla, "null")) {
7b565754	174	char llabuf[20];
aba5acdf SH	175	int l;
	176
	177	l = ll_addr_a2n(llabuf, sizeof(llabuf), lla);
542b0cc7 SH	178	if (l < 0)
	179	return -1;
	180
	181	if (addattr_l(&req.n, sizeof(req), NDA_LLADDR, llabuf, l) < 0)
	182	return -1;
aba5acdf SH	183	}
aba5acdf SH	184
aba5acdf SH	185	ll_init_map(&rth);
aba5acdf SH	186
fe99adbc SP	187	if (dev) {
	188	req.ndm.ndm_ifindex = ll_name_to_index(dev);
	189	if (!req.ndm.ndm_ifindex)
	190	return nodev(dev);
aba5acdf SH	191	}
aba5acdf SH	192
86bf43c7	193	if (rtnl_talk(&rth, &req.n, NULL) < 0)
aba5acdf SH	194	exit(2);
aba5acdf SH	195
351efcde	196	return 0;
aba5acdf SH	197	}
aba5acdf SH	198
aac7f725 SH	199	static void print_cacheinfo(const struct nda_cacheinfo *ci)
	200	{
	201	static int hz;
	202
	203	if (!hz)
	204	hz = get_user_hz();
	205
	206	if (ci->ndm_refcnt)
	207	print_uint(PRINT_ANY, "refcnt",
	208	" ref %u", ci->ndm_refcnt);
	209
	210	print_uint(PRINT_ANY, "used", " used %u", ci->ndm_used / hz);
	211	print_uint(PRINT_ANY, "confirmed", "/%u", ci->ndm_confirmed / hz);
7cd3f08b	212	print_uint(PRINT_ANY, "updated", "/%u", ci->ndm_updated / hz);
aac7f725 SH	213	}
	214
	215	static void print_neigh_state(unsigned int nud)
	216	{
	217
	218	open_json_array(PRINT_JSON,
	219	is_json_context() ? "state" : "");
	220
	221	#define PRINT_FLAG(f) \
	222	if (nud & NUD_##f) { \
	223	nud &= ~NUD_##f; \
	224	print_string(PRINT_ANY, NULL, " %s", #f); \
	225	}
	226
	227	PRINT_FLAG(INCOMPLETE);
	228	PRINT_FLAG(REACHABLE);
	229	PRINT_FLAG(STALE);
	230	PRINT_FLAG(DELAY);
	231	PRINT_FLAG(PROBE);
	232	PRINT_FLAG(FAILED);
	233	PRINT_FLAG(NOARP);
	234	PRINT_FLAG(PERMANENT);
	235	#undef PRINT_FLAG
	236
	237	close_json_array(PRINT_JSON, NULL);
	238	}
aba5acdf	239
cd554f2c	240	int print_neigh(struct nlmsghdr n, void arg)
aba5acdf	241	{
56f5daac	242	FILE fp = (FILE )arg;
aba5acdf SH	243	struct ndmsg *r = NLMSG_DATA(n);
aba5acdf SH	244	int len = n->nlmsg_len;
56f5daac	245	struct rtattr *tb[NDA_MAX+1];
0d238ca2	246	static int logit = 1;
aba5acdf	247
1556e29d DS	248	if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH &&
1556e29d DS	249	n->nlmsg_type != RTM_GETNEIGH) {
aba5acdf SH	250	fprintf(stderr, "Not RTM_NEWNEIGH: %08x %08x %08x\n",
aba5acdf SH	251	n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
ae665a52	252
aba5acdf SH	253	return 0;
	254	}
	255	len -= NLMSG_LENGTH(sizeof(*r));
	256	if (len < 0) {
	257	fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
	258	return -1;
	259	}
	260
	261	if (filter.flushb && n->nlmsg_type != RTM_NEWNEIGH)
	262	return 0;
	263
	264	if (filter.family && filter.family != r->ndm_family)
	265	return 0;
	266	if (filter.index && filter.index != r->ndm_ifindex)
	267	return 0;
	268	if (!(filter.state&r->ndm_state) &&
1dac7817	269	!(r->ndm_flags & NTF_PROXY) &&
9c6a6d84	270	!(r->ndm_flags & NTF_EXT_LEARNED) &&
aba5acdf	271	(r->ndm_state \|\| !(filter.state&0x100)) &&
aac7f725	272	(r->ndm_family != AF_DECnet))
aba5acdf SH	273	return 0;
aba5acdf SH	274
0d238ca2 DA	275	if (filter.master && !(n->nlmsg_flags & NLM_F_DUMP_FILTERED)) {
	276	if (logit) {
	277	logit = 0;
	278	fprintf(fp,
	279	"\nWARNING: Kernel does not support filtering by master device\n\n");
	280	}
	281	}
	282
aba5acdf SH	283	parse_rtattr(tb, NDA_MAX, NDA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
aba5acdf SH	284
a4270fd8 SP	285	if (inet_addr_match_rta(&filter.pfx, tb[NDA_DST]))
a4270fd8 SP	286	return 0;
56f5daac	287
aba5acdf SH	288	if (filter.unused_only && tb[NDA_CACHEINFO]) {
aba5acdf SH	289	struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
56f5daac	290
aba5acdf SH	291	if (ci->ndm_refcnt)
	292	return 0;
	293	}
	294
	295	if (filter.flushb) {
	296	struct nlmsghdr *fn;
56f5daac	297
aba5acdf SH	298	if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
	299	if (flush_update())
	300	return -1;
	301	}
56f5daac	302	fn = (struct nlmsghdr *)(filter.flushb + NLMSG_ALIGN(filter.flushp));
aba5acdf SH	303	memcpy(fn, n, n->nlmsg_len);
	304	fn->nlmsg_type = RTM_DELNEIGH;
	305	fn->nlmsg_flags = NLM_F_REQUEST;
351efcde	306	fn->nlmsg_seq = ++rth.seq;
56f5daac	307	filter.flushp = (((char *)fn) + n->nlmsg_len) - filter.flushb;
aba5acdf SH	308	filter.flushed++;
	309	if (show_stats < 2)
	310	return 0;
	311	}
	312
aac7f725	313	open_json_object(NULL);
6ea3ebaf	314	if (n->nlmsg_type == RTM_DELNEIGH)
aac7f725	315	print_bool(PRINT_ANY, "deleted", "Deleted ", true);
1556e29d	316	else if (n->nlmsg_type == RTM_GETNEIGH)
aac7f725 SH	317	print_null(PRINT_ANY, "miss", "%s ", "miss");
aac7f725 SH	318
aba5acdf	319	if (tb[NDA_DST]) {
aac7f725 SH	320	const char *dst;
	321
	322	dst = format_host_rta(r->ndm_family, tb[NDA_DST]);
	323	print_color_string(PRINT_ANY,
	324	ifa_family_color(r->ndm_family),
	325	"dst", "%s ", dst);
aba5acdf	326	}
aac7f725 SH	327
	328	if (!filter.index && r->ndm_ifindex) {
	329	if (!is_json_context())
	330	fprintf(fp, "dev ");
	331
	332	print_color_string(PRINT_ANY, COLOR_IFNAME,
	333	"dev", "%s ",
	334	ll_index_to_name(r->ndm_ifindex));
	335	}
	336
aba5acdf	337	if (tb[NDA_LLADDR]) {
aac7f725	338	const char *lladdr;
aba5acdf	339	SPRINT_BUF(b1);
6a34d291	340
aac7f725 SH	341	lladdr = ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
	342	RTA_PAYLOAD(tb[NDA_LLADDR]),
	343	ll_index_to_type(r->ndm_ifindex),
	344	b1, sizeof(b1));
aba5acdf	345
aac7f725 SH	346	if (!is_json_context())
aac7f725 SH	347	fprintf(fp, "lladdr ");
56f5daac	348
aac7f725 SH	349	print_color_string(PRINT_ANY, COLOR_MAC,
aac7f725 SH	350	"lladdr", "%s", lladdr);
69410a49	351	}
69410a49	352
aac7f725 SH	353	if (r->ndm_flags & NTF_ROUTER)
	354	print_null(PRINT_ANY, "router", " %s", "router");
	355
	356	if (r->ndm_flags & NTF_PROXY)
	357	print_null(PRINT_ANY, "proxy", " %s", "proxy");
	358
4c45b684 RP	359	if (r->ndm_flags & NTF_EXT_LEARNED)
	360	print_null(PRINT_ANY, "extern_learn", " %s ", "extern_learn");
	361
aac7f725 SH	362	if (show_stats) {
	363	if (tb[NDA_CACHEINFO])
	364	print_cacheinfo(RTA_DATA(tb[NDA_CACHEINFO]));
	365
	366	if (tb[NDA_PROBES])
	367	print_uint(PRINT_ANY, "probes", " probes %u",
	368	rta_getattr_u32(tb[NDA_PROBES]));
aba5acdf	369	}
aba5acdf	370
aac7f725 SH	371	if (r->ndm_state)
	372	print_neigh_state(r->ndm_state);
	373
	374	print_string(PRINT_FP, NULL, "\n", "");
	375	close_json_object();
	376	fflush(stdout);
	377
aba5acdf SH	378	return 0;
	379	}
	380
093b7646	381	void ipneigh_reset_filter(int ifindex)
aba5acdf SH	382	{
	383	memset(&filter, 0, sizeof(filter));
	384	filter.state = ~0;
093b7646	385	filter.index = ifindex;
aba5acdf SH	386	}
aba5acdf SH	387
d1f28cf1	388	static int do_show_or_flush(int argc, char **argv, int flush)
aba5acdf	389	{
0d238ca2 DA	390	struct {
	391	struct nlmsghdr n;
	392	struct ndmsg ndm;
56f5daac	393	char buf[256];
d17b136f PS	394	} req = {
	395	.n.nlmsg_type = RTM_GETNEIGH,
	396	.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
	397	};
aba5acdf	398	char *filter_dev = NULL;
aba5acdf	399	int state_given = 0;
0d238ca2	400
093b7646	401	ipneigh_reset_filter(0);
aba5acdf SH	402
	403	if (!filter.family)
	404	filter.family = preferred_family;
	405
	406	if (flush) {
	407	if (argc <= 0) {
	408	fprintf(stderr, "Flush requires arguments.\n");
	409	return -1;
	410	}
	411	filter.state = ~(NUD_PERMANENT\|NUD_NOARP);
	412	} else
	413	filter.state = 0xFF & ~NUD_NOARP;
	414
	415	while (argc > 0) {
	416	if (strcmp(*argv, "dev") == 0) {
	417	NEXT_ARG();
	418	if (filter_dev)
	419	duparg("dev", *argv);
	420	filter_dev = *argv;
0d238ca2 DA	421	} else if (strcmp(*argv, "master") == 0) {
0d238ca2 DA	422	int ifindex;
56f5daac	423
0d238ca2 DA	424	NEXT_ARG();
	425	ifindex = ll_name_to_index(*argv);
	426	if (!ifindex)
	427	invarg("Device does not exist\n", *argv);
	428	addattr32(&req.n, sizeof(req), NDA_MASTER, ifindex);
	429	filter.master = ifindex;
5db1adae DA	430	} else if (strcmp(*argv, "vrf") == 0) {
	431	int ifindex;
	432
	433	NEXT_ARG();
	434	ifindex = ll_name_to_index(*argv);
	435	if (!ifindex)
	436	invarg("Not a valid VRF name\n", *argv);
	437	if (!name_is_vrf(*argv))
	438	invarg("Not a valid VRF name\n", *argv);
	439	addattr32(&req.n, sizeof(req), NDA_MASTER, ifindex);
	440	filter.master = ifindex;
aba5acdf SH	441	} else if (strcmp(*argv, "unused") == 0) {
	442	filter.unused_only = 1;
	443	} else if (strcmp(*argv, "nud") == 0) {
56f5daac SH	444	unsigned int state;
56f5daac SH	445
aba5acdf SH	446	NEXT_ARG();
	447	if (!state_given) {
	448	state_given = 1;
	449	filter.state = 0;
	450	}
	451	if (nud_state_a2n(&state, *argv)) {
	452	if (strcmp(*argv, "all") != 0)
	453	invarg("nud state is bad", *argv);
	454	state = ~0;
	455	if (flush)
	456	state &= ~NUD_NOARP;
	457	}
	458	if (state == 0)
	459	state = 0x100;
	460	filter.state \|= state;
1dac7817	461	} else if (strcmp(*argv, "proxy") == 0)
0d238ca2	462	req.ndm.ndm_flags = NTF_PROXY;
1dac7817	463	else {
aba5acdf SH	464	if (strcmp(*argv, "to") == 0) {
	465	NEXT_ARG();
	466	}
	467	if (matches(*argv, "help") == 0)
	468	usage();
a4270fd8 SP	469	if (get_prefix(&filter.pfx, *argv, filter.family))
a4270fd8 SP	470	invarg("to value is invalid\n", *argv);
aba5acdf SH	471	if (filter.family == AF_UNSPEC)
	472	filter.family = filter.pfx.family;
	473	}
	474	argc--; argv++;
	475	}
	476
aba5acdf SH	477	ll_init_map(&rth);
	478
	479	if (filter_dev) {
fe99adbc SP	480	filter.index = ll_name_to_index(filter_dev);
	481	if (!filter.index)
	482	return nodev(filter_dev);
b8c75324	483	addattr32(&req.n, sizeof(req), NDA_IFINDEX, filter.index);
aba5acdf SH	484	}
aba5acdf SH	485
1c346dcc JH	486	req.ndm.ndm_family = filter.family;
1c346dcc JH	487
aba5acdf SH	488	if (flush) {
	489	int round = 0;
	490	char flushb[4096-512];
	491
	492	filter.flushb = flushb;
	493	filter.flushp = 0;
	494	filter.flushe = sizeof(flushb);
aba5acdf	495
66081849	496	while (round < MAX_ROUNDS) {
1c346dcc	497	if (rtnl_dump_request_n(&rth, &req.n) < 0) {
aba5acdf SH	498	perror("Cannot send dump request");
	499	exit(1);
	500	}
	501	filter.flushed = 0;
cd70f3f5	502	if (rtnl_dump_filter(&rth, print_neigh, stdout) < 0) {
aba5acdf SH	503	fprintf(stderr, "Flush terminated\n");
	504	exit(1);
	505	}
	506	if (filter.flushed == 0) {
f0b34d2d AH	507	if (show_stats) {
	508	if (round == 0)
	509	printf("Nothing to flush.\n");
	510	else
56f5daac	511	printf("* Flush is complete after %d round%s *\n", round, round > 1?"s":"");
f0b34d2d	512	}
aba5acdf SH	513	fflush(stdout);
	514	return 0;
	515	}
	516	round++;
	517	if (flush_update() < 0)
	518	exit(1);
	519	if (show_stats) {
	520	printf("\n* Round %d, deleting %d entries *\n", round, filter.flushed);
	521	fflush(stdout);
	522	}
ad0a6a2c	523	filter.state &= ~NUD_FAILED;
aba5acdf	524	}
66081849 SH	525	printf("*** Flush not complete bailing out after %d rounds\n",
	526	MAX_ROUNDS);
	527	return 1;
aba5acdf SH	528	}
aba5acdf SH	529
0d238ca2	530	if (rtnl_dump_request_n(&rth, &req.n) < 0) {
aba5acdf SH	531	perror("Cannot send dump request");
	532	exit(1);
	533	}
	534
aac7f725	535	new_json_obj(json);
cd70f3f5	536	if (rtnl_dump_filter(&rth, print_neigh, stdout) < 0) {
aba5acdf SH	537	fprintf(stderr, "Dump terminated\n");
	538	exit(1);
	539	}
aac7f725	540	delete_json_obj();
aba5acdf SH	541
	542	return 0;
	543	}
	544
	545	int do_ipneigh(int argc, char **argv)
	546	{
	547	if (argc > 0) {
	548	if (matches(*argv, "add") == 0)
	549	return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE\|NLM_F_EXCL, argc-1, argv+1);
	550	if (matches(*argv, "change") == 0 \|\|
	551	strcmp(*argv, "chg") == 0)
	552	return ipneigh_modify(RTM_NEWNEIGH, NLM_F_REPLACE, argc-1, argv+1);
	553	if (matches(*argv, "replace") == 0)
	554	return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE\|NLM_F_REPLACE, argc-1, argv+1);
	555	if (matches(*argv, "delete") == 0)
	556	return ipneigh_modify(RTM_DELNEIGH, 0, argc-1, argv+1);
	557	if (matches(*argv, "get") == 0) {
	558	fprintf(stderr, "Sorry, \"neigh get\" is not implemented :-(\n");
	559	return -1;
	560	}
	561	if (matches(*argv, "show") == 0 \|\|
	562	matches(*argv, "lst") == 0 \|\|
	563	matches(*argv, "list") == 0)
	564	return do_show_or_flush(argc-1, argv+1, 0);
	565	if (matches(*argv, "flush") == 0)
	566	return do_show_or_flush(argc-1, argv+1, 1);
	567	if (matches(*argv, "help") == 0)
	568	usage();
	569	} else
	570	return do_show_or_flush(0, NULL, 0);
	571
	572	fprintf(stderr, "Command \"%s\" is unknown, try \"ip neigh help\".\n", *argv);
	573	exit(-1);
	574	}