Blame ip/ipaddrlabel.c

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/*
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 * ipaddrlabel.c	"ip addrlabel"
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 *
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 * Copyright (C)2007 USAGI/WIDE Project
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, see <http://www.gnu.org/licenses>.
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 *
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 *
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 * Based on iprule.c.
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 *
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 * Authors:	YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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 *
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <linux/types.h>
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#include <linux/if_addrlabel.h>
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#include "rt_names.h"
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#include "utils.h"
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#include "ip_common.h"
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#include "json_print.h"
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#define IFAL_RTA(r)	((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))))
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#define IFAL_PAYLOAD(n)	NLMSG_PAYLOAD(n, sizeof(struct ifaddrlblmsg))
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extern struct rtnl_handle rth;
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static void usage(void) __attribute__((noreturn));
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static void usage(void)
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{
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	fprintf(stderr,
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		"Usage: ip addrlabel { add | del } prefix PREFIX [ dev DEV ] [ label LABEL ]\n"
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		"       ip addrlabel [ list | flush | help ]\n");
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	exit(-1);
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}
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int print_addrlabel(struct nlmsghdr *n, void *arg)
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{
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	struct ifaddrlblmsg *ifal = NLMSG_DATA(n);
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	int len = n->nlmsg_len;
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	struct rtattr *tb[IFAL_MAX+1];
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	if (n->nlmsg_type != RTM_NEWADDRLABEL && n->nlmsg_type != RTM_DELADDRLABEL)
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		return 0;
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	len -= NLMSG_LENGTH(sizeof(*ifal));
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	if (len < 0)
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		return -1;
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	parse_rtattr(tb, IFAL_MAX, IFAL_RTA(ifal), len);
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	open_json_object(NULL);
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	if (n->nlmsg_type == RTM_DELADDRLABEL)
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		print_bool(PRINT_ANY, "deleted", "Deleted ", true);
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	if (tb[IFAL_ADDRESS]) {
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		const char *host
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			= format_host_rta(ifal->ifal_family,
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					  tb[IFAL_ADDRESS]);
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		print_string(PRINT_FP, NULL, "prefix ", NULL);
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		print_color_string(PRINT_ANY,
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				   ifa_family_color(ifal->ifal_family),
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				   "address", "%s", host);
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		print_uint(PRINT_ANY, "prefixlen", "/%u ",
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			   ifal->ifal_prefixlen);
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	}
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	if (ifal->ifal_index) {
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		print_string(PRINT_FP, NULL, "dev ", NULL);
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		print_color_string(PRINT_ANY, COLOR_IFNAME,
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				   "ifname", "%s ",
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				   ll_index_to_name(ifal->ifal_index));
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	}
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	if (tb[IFAL_LABEL] && RTA_PAYLOAD(tb[IFAL_LABEL]) == sizeof(uint32_t)) {
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		uint32_t label = rta_getattr_u32(tb[IFAL_LABEL]);
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		print_uint(PRINT_ANY,
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			   "label", "label %u ", label);
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	}
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	print_string(PRINT_FP, NULL, "\n", "");
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	close_json_object();
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	return 0;
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}
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static int ipaddrlabel_list(int argc, char **argv)
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{
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	int af = preferred_family;
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	if (af == AF_UNSPEC)
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		af = AF_INET6;
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	if (argc > 0) {
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		fprintf(stderr, "\"ip addrlabel show\" does not take any arguments.\n");
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		return -1;
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	}
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	if (rtnl_addrlbldump_req(&rth, af) < 0) {
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		perror("Cannot send dump request");
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		return 1;
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	}
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	new_json_obj(json);
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	if (rtnl_dump_filter(&rth, print_addrlabel, stdout) < 0) {
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		fprintf(stderr, "Dump terminated\n");
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		return 1;
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	}
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	delete_json_obj();
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	return 0;
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}
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static int ipaddrlabel_modify(int cmd, int argc, char **argv)
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{
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	struct {
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		struct nlmsghdr	n;
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		struct ifaddrlblmsg	ifal;
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		char			buf[1024];
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	} req = {
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		.n.nlmsg_type = cmd,
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		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrlblmsg)),
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		.n.nlmsg_flags = NLM_F_REQUEST,
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		.ifal.ifal_family = preferred_family,
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	};
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	inet_prefix prefix = {};
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	uint32_t label = 0xffffffffUL;
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	char *p = NULL;
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	char *l = NULL;
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	if (cmd == RTM_NEWADDRLABEL) {
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		req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
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	}
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	while (argc > 0) {
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		if (strcmp(*argv, "prefix") == 0) {
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			NEXT_ARG();
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			p = *argv;
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			get_prefix(&prefix, *argv, preferred_family);
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		} else if (strcmp(*argv, "dev") == 0) {
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			NEXT_ARG();
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			if ((req.ifal.ifal_index = ll_name_to_index(*argv)) == 0)
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				invarg("dev is invalid\n", *argv);
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		} else if (strcmp(*argv, "label") == 0) {
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			NEXT_ARG();
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			l = *argv;
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			if (get_u32(&label, *argv, 0) || label == 0xffffffffUL)
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				invarg("label is invalid\n", *argv);
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		}
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		argc--;
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		argv++;
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	}
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	if (p == NULL) {
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		fprintf(stderr, "Not enough information: \"prefix\" argument is required.\n");
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		return -1;
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	}
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	if (l == NULL) {
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		fprintf(stderr, "Not enough information: \"label\" argument is required.\n");
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		return -1;
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	}
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	addattr32(&req.n, sizeof(req), IFAL_LABEL, label);
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	addattr_l(&req.n, sizeof(req), IFAL_ADDRESS, &prefix.data, prefix.bytelen);
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	req.ifal.ifal_prefixlen = prefix.bitlen;
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	if (req.ifal.ifal_family == AF_UNSPEC)
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		req.ifal.ifal_family = AF_INET6;
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	if (rtnl_talk(&rth, &req.n, NULL) < 0)
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		return -2;
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	return 0;
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}
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static int flush_addrlabel(struct nlmsghdr *n, void *arg)
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{
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	struct rtnl_handle rth2;
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	struct rtmsg *r = NLMSG_DATA(n);
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	int len = n->nlmsg_len;
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	struct rtattr *tb[IFAL_MAX+1];
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	len -= NLMSG_LENGTH(sizeof(*r));
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	if (len < 0)
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		return -1;
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	parse_rtattr(tb, IFAL_MAX, RTM_RTA(r), len);
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	if (tb[IFAL_ADDRESS]) {
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		n->nlmsg_type = RTM_DELADDRLABEL;
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		n->nlmsg_flags = NLM_F_REQUEST;
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		if (rtnl_open(&rth2, 0) < 0)
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			return -1;
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		if (rtnl_talk(&rth2, n, NULL) < 0)
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			return -2;
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		rtnl_close(&rth2;;
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	}
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	return 0;
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}
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static int ipaddrlabel_flush(int argc, char **argv)
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{
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	int af = preferred_family;
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	if (af == AF_UNSPEC)
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		af = AF_INET6;
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	if (argc > 0) {
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		fprintf(stderr, "\"ip addrlabel flush\" does not allow extra arguments\n");
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		return -1;
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	}
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	if (rtnl_addrlbldump_req(&rth, af) < 0) {
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		perror("Cannot send dump request");
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		return -1;
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	}
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	if (rtnl_dump_filter(&rth, flush_addrlabel, NULL) < 0) {
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		fprintf(stderr, "Flush terminated\n");
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		return -1;
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	}
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	return 0;
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}
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int do_ipaddrlabel(int argc, char **argv)
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{
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	if (argc < 1) {
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		return ipaddrlabel_list(0, NULL);
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	} else if (matches(argv[0], "list") == 0 ||
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		   matches(argv[0], "lst") == 0 ||
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		   matches(argv[0], "show") == 0) {
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		return ipaddrlabel_list(argc-1, argv+1);
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	} else if (matches(argv[0], "add") == 0) {
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		return ipaddrlabel_modify(RTM_NEWADDRLABEL, argc-1, argv+1);
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	} else if (matches(argv[0], "delete") == 0) {
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		return ipaddrlabel_modify(RTM_DELADDRLABEL, argc-1, argv+1);
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	} else if (matches(argv[0], "flush") == 0) {
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		return ipaddrlabel_flush(argc-1, argv+1);
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	} else if (matches(argv[0], "help") == 0)
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		usage();
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	fprintf(stderr, "Command \"%s\" is unknown, try \"ip addrlabel help\".\n", *argv);
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	exit(-1);
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}