Blame ip/iplink_vrf.c

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/* iplink_vrf.c	VRF device support
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 *
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 *              This program is free software; you can redistribute it and/or
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 *              modify it under the terms of the GNU General Public License
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 *              as published by the Free Software Foundation; either version
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 *              2 of the License, or (at your option) any later version.
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 *
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 * Authors:     Shrijeet Mukherjee <shm@cumulusnetworks.com>
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <linux/if_link.h>
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#include <errno.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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static void vrf_explain(FILE *f)
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{
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	fprintf(f, "Usage: ... vrf table TABLEID\n");
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}
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static void explain(void)
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{
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	vrf_explain(stderr);
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}
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static int vrf_parse_opt(struct link_util *lu, int argc, char **argv,
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			    struct nlmsghdr *n)
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{
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	while (argc > 0) {
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		if (matches(*argv, "table") == 0) {
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			__u32 table;
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			NEXT_ARG();
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			if (rtnl_rttable_a2n(&table, *argv))
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				invarg("invalid table ID\n", *argv);
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			addattr32(n, 1024, IFLA_VRF_TABLE, table);
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		} else if (matches(*argv, "help") == 0) {
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			explain();
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			return -1;
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		} else {
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			fprintf(stderr, "vrf: unknown option \"%s\"?\n",
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				*argv);
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			explain();
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			return -1;
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		}
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		argc--, argv++;
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	}
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	return 0;
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}
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static void vrf_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
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{
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	if (!tb)
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		return;
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	if (tb[IFLA_VRF_TABLE])
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		print_uint(PRINT_ANY,
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			   "table",
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			   "table %u ",
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			   rta_getattr_u32(tb[IFLA_VRF_TABLE]));
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}
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static void vrf_slave_print_opt(struct link_util *lu, FILE *f,
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				struct rtattr *tb[])
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{
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	if (!tb)
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		return;
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	if (tb[IFLA_VRF_PORT_TABLE]) {
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		print_uint(PRINT_ANY,
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			   "table",
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			   "table %u ",
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			   rta_getattr_u32(tb[IFLA_VRF_PORT_TABLE]));
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	}
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}
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static void vrf_print_help(struct link_util *lu, int argc, char **argv,
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			   FILE *f)
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{
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	vrf_explain(f);
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}
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struct link_util vrf_link_util = {
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	.id		= "vrf",
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	.maxattr	= IFLA_VRF_MAX,
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	.parse_opt	= vrf_parse_opt,
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	.print_opt	= vrf_print_opt,
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	.print_help	= vrf_print_help,
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};
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struct link_util vrf_slave_link_util = {
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	.id             = "vrf_slave",
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	.maxattr        = IFLA_VRF_PORT_MAX,
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	.print_opt	= vrf_slave_print_opt,
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};
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/* returns table id if name is a VRF device */
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__u32 ipvrf_get_table(const char *name)
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{
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	struct {
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		struct nlmsghdr		n;
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		struct ifinfomsg	i;
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		char			buf[1024];
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	} req = {
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		.n = {
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			.nlmsg_len   = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
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			.nlmsg_flags = NLM_F_REQUEST,
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			.nlmsg_type  = RTM_GETLINK,
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		},
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		.i = {
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			.ifi_family  = preferred_family,
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		},
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	};
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	struct nlmsghdr *answer;
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	struct rtattr *tb[IFLA_MAX+1];
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	struct rtattr *li[IFLA_INFO_MAX+1];
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	struct rtattr *vrf_attr[IFLA_VRF_MAX + 1];
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	struct ifinfomsg *ifi;
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	__u32 tb_id = 0;
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	int len;
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	addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
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	if (rtnl_talk_suppress_rtnl_errmsg(&rth, &req.n, &answer) < 0) {
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		/* special case "default" vrf to be the main table */
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		if (errno == ENODEV && !strcmp(name, "default"))
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			if (rtnl_rttable_a2n(&tb_id, "main"))
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				fprintf(stderr,
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					"BUG: RTTable \"main\" not found.\n");
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		return tb_id;
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	}
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	ifi = NLMSG_DATA(answer);
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	len = answer->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
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	if (len < 0) {
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		fprintf(stderr, "BUG: Invalid response to link query.\n");
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		goto out;
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	}
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	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
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	if (!tb[IFLA_LINKINFO])
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		goto out;
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	parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
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	if (!li[IFLA_INFO_KIND] || !li[IFLA_INFO_DATA])
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		goto out;
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	if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf"))
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		goto out;
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	parse_rtattr_nested(vrf_attr, IFLA_VRF_MAX, li[IFLA_INFO_DATA]);
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	if (vrf_attr[IFLA_VRF_TABLE])
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		tb_id = rta_getattr_u32(vrf_attr[IFLA_VRF_TABLE]);
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	if (!tb_id)
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		fprintf(stderr, "BUG: VRF %s is missing table id\n", name);
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out:
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	free(answer);
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	return tb_id;
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}
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int name_is_vrf(const char *name)
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{
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	struct {
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		struct nlmsghdr		n;
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		struct ifinfomsg	i;
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		char			buf[1024];
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	} req = {
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		.n = {
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			.nlmsg_len   = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
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			.nlmsg_flags = NLM_F_REQUEST,
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			.nlmsg_type  = RTM_GETLINK,
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		},
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		.i = {
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			.ifi_family  = preferred_family,
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		},
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	};
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	struct nlmsghdr *answer;
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	struct rtattr *tb[IFLA_MAX+1];
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	struct rtattr *li[IFLA_INFO_MAX+1];
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	struct ifinfomsg *ifi;
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	int ifindex = 0;
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	int len;
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	addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
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	if (rtnl_talk_suppress_rtnl_errmsg(&rth, &req.n, &answer) < 0)
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		return 0;
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	ifi = NLMSG_DATA(answer);
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	len = answer->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
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	if (len < 0) {
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		fprintf(stderr, "BUG: Invalid response to link query.\n");
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		goto out;
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	}
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	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
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	if (!tb[IFLA_LINKINFO])
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		goto out;
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	parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
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	if (!li[IFLA_INFO_KIND])
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		goto out;
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	if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf"))
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		goto out;
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	ifindex = ifi->ifi_index;
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out:
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	free(answer);
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	return ifindex;
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}