ip/tunnel.c - pub/scm/network/iproute2/iproute2-next - Git at Google

 /*
  * Copyright (C)2006 USAGI/WIDE Project
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <http://www.gnu.org/licenses>.
  */
 /*
  * split from ip_tunnel.c
  */
 /*
  * Author:
  *	Masahide NAKAMURA @USAGI
  */

 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <netinet/in.h>
 #include <linux/if.h>
 #include <linux/ip.h>
 #include <linux/if_tunnel.h>
 #include <linux/if_arp.h>

 #include "utils.h"
 #include "tunnel.h"
 #include "json_print.h"

 const char *tnl_strproto(__u8 proto)
 {
 	switch (proto) {
 	case IPPROTO_IPIP:
 		return "ip";
 	case IPPROTO_GRE:
 		return "gre";
 	case IPPROTO_IPV6:
 		return "ipv6";
 	case IPPROTO_ESP:
 		return "esp";
 	case IPPROTO_MPLS:
 		return "mpls";
 	case 0:
 		return "any";
 	default:
 		return "unknown";
 	}
 }

 int tnl_get_ioctl(const char *basedev, void *p)
 {
 	struct ifreq ifr;
 	int fd;
 	int err;

 	strlcpy(ifr.ifr_name, basedev, IFNAMSIZ);
 	ifr.ifr_ifru.ifru_data = (void *)p;

 	fd = socket(preferred_family, SOCK_DGRAM, 0);
 	if (fd < 0) {
 		fprintf(stderr, "create socket failed: %s\n", strerror(errno));
 		return -1;
 	}

 	err = ioctl(fd, SIOCGETTUNNEL, &ifr);
 	if (err)
 		fprintf(stderr, "get tunnel \"%s\" failed: %s\n", basedev,
 			strerror(errno));

 	close(fd);
 	return err;
 }

 int tnl_add_ioctl(int cmd, const char *basedev, const char *name, void *p)
 {
 	struct ifreq ifr;
 	int fd;
 	int err;

 	if (cmd == SIOCCHGTUNNEL && name[0])
 		strlcpy(ifr.ifr_name, name, IFNAMSIZ);
 	else
 		strlcpy(ifr.ifr_name, basedev, IFNAMSIZ);
 	ifr.ifr_ifru.ifru_data = p;

 	fd = socket(preferred_family, SOCK_DGRAM, 0);
 	if (fd < 0) {
 		fprintf(stderr, "create socket failed: %s\n", strerror(errno));
 		return -1;
 	}

 	err = ioctl(fd, cmd, &ifr);
 	if (err)
 		fprintf(stderr, "add tunnel \"%s\" failed: %s\n", ifr.ifr_name,
 			strerror(errno));
 	close(fd);
 	return err;
 }

 int tnl_del_ioctl(const char *basedev, const char *name, void *p)
 {
 	struct ifreq ifr;
 	int fd;
 	int err;

 	if (name[0])
 		strlcpy(ifr.ifr_name, name, IFNAMSIZ);
 	else
 		strlcpy(ifr.ifr_name, basedev, IFNAMSIZ);

 	ifr.ifr_ifru.ifru_data = p;

 	fd = socket(preferred_family, SOCK_DGRAM, 0);
 	if (fd < 0) {
 		fprintf(stderr, "create socket failed: %s\n", strerror(errno));
 		return -1;
 	}

 	err = ioctl(fd, SIOCDELTUNNEL, &ifr);
 	if (err)
 		fprintf(stderr, "delete tunnel \"%s\" failed: %s\n",
 			ifr.ifr_name, strerror(errno));
 	close(fd);
 	return err;
 }

 static int tnl_gen_ioctl(int cmd, const char *name,
 			 void *p, int skiperr)
 {
 	struct ifreq ifr;
 	int fd;
 	int err;

 	strlcpy(ifr.ifr_name, name, IFNAMSIZ);
 	ifr.ifr_ifru.ifru_data = p;

 	fd = socket(preferred_family, SOCK_DGRAM, 0);
 	if (fd < 0) {
 		fprintf(stderr, "create socket failed: %s\n", strerror(errno));
 		return -1;
 	}

 	err = ioctl(fd, cmd, &ifr);
 	if (err && errno != skiperr)
 		fprintf(stderr, "%s: ioctl %x failed: %s\n", name,
 			cmd, strerror(errno));
 	close(fd);
 	return err;
 }

 int tnl_prl_ioctl(int cmd, const char *name, void *p)
 {
 	return tnl_gen_ioctl(cmd, name, p, -1);
 }

 int tnl_6rd_ioctl(int cmd, const char *name, void *p)
 {
 	return tnl_gen_ioctl(cmd, name, p, -1);
 }

 int tnl_ioctl_get_6rd(const char *name, void *p)
 {
 	return tnl_gen_ioctl(SIOCGET6RD, name, p, EINVAL);
 }

 __be32 tnl_parse_key(const char *name, const char *key)
 {
 	unsigned int uval;

 	if (strchr(key, '.'))
 		return get_addr32(key);

 	if (get_unsigned(&uval, key, 0) < 0) {
 		fprintf(stderr,
 			"invalid value for \"%s\": \"%s\"; it should be an unsigned integer\n",
 			name, key);
 		exit(-1);
 	}
 	return htonl(uval);
 }

 static const char *tnl_encap_str(const char *name, int enabled, int port)
 {
 	static const char ne[][sizeof("no")] = {
 		[0] = "no",
 		[1] = "",
 	};
 	static char buf[32];
 	char b1[16];
 	const char *val;

 	if (!port) {
 		val = "auto ";
 	} else if (port < 0) {
 		val = "";
 	} else {
 		snprintf(b1, sizeof(b1), "%u ", port - 1);
 		val = b1;
 	}

 	snprintf(buf, sizeof(buf), "%sencap-%s %s", ne[!!enabled], name, val);
 	return buf;
 }

 void tnl_print_encap(struct rtattr *tb[],
 		     int encap_type, int encap_flags,
 		     int encap_sport, int encap_dport)
 {
 	__u16 type, flags, sport, dport;

 	if (!tb[encap_type])
 		return;

 	type = rta_getattr_u16(tb[encap_type]);
 	if (type == TUNNEL_ENCAP_NONE)
 		return;

 	flags = rta_getattr_u16(tb[encap_flags]);
 	sport = rta_getattr_u16(tb[encap_sport]);
 	dport = rta_getattr_u16(tb[encap_dport]);

 	open_json_object("encap");
 	print_string(PRINT_FP, NULL, "encap ", NULL);

 	switch (type) {
 	case TUNNEL_ENCAP_FOU:
 		print_string(PRINT_ANY, "type", "%s ", "fou");
 		break;
 	case TUNNEL_ENCAP_GUE:
 		print_string(PRINT_ANY, "type", "%s ", "gue");
 		break;
 	default:
 		print_null(PRINT_ANY, "type", "%s ", "unknown");
 		break;
 	}

 	if (is_json_context()) {
 		print_uint(PRINT_JSON, "sport", NULL, ntohs(sport));
 		print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
 		print_bool(PRINT_JSON, "csum", NULL,
 			   flags & TUNNEL_ENCAP_FLAG_CSUM);
 		print_bool(PRINT_JSON, "csum6", NULL,
 			   flags & TUNNEL_ENCAP_FLAG_CSUM6);
 		print_bool(PRINT_JSON, "remcsum", NULL,
 			   flags & TUNNEL_ENCAP_FLAG_REMCSUM);
 		close_json_object();
 	} else {
 		int t;

 		t = sport ? ntohs(sport) + 1 : 0;
 		print_string(PRINT_FP, NULL, "%s",
 			     tnl_encap_str("sport", 1, t));

 		t = ntohs(dport) + 1;
 		print_string(PRINT_FP, NULL, "%s",
 			     tnl_encap_str("dport", 1, t));

 		t = flags & TUNNEL_ENCAP_FLAG_CSUM;
 		print_string(PRINT_FP, NULL, "%s",
 			     tnl_encap_str("csum", t, -1));

 		t = flags & TUNNEL_ENCAP_FLAG_CSUM6;
 		print_string(PRINT_FP, NULL, "%s",
 			     tnl_encap_str("csum6", t, -1));

 		t = flags & TUNNEL_ENCAP_FLAG_REMCSUM;
 		print_string(PRINT_FP, NULL, "%s",
 			     tnl_encap_str("remcsum", t, -1));
 	}
 }

 void tnl_print_endpoint(const char *name, const struct rtattr *rta, int family)
 {
 	const char *value;
 	inet_prefix dst;

 	if (!rta) {
 		value = "any";
 	} else if (get_addr_rta(&dst, rta, family)) {
 		value = "unknown";
 	} else if (dst.flags & ADDRTYPE_UNSPEC) {
 		value = "any";
 	} else {
 		value = format_host(family, dst.bytelen, dst.data);
 		if (!value)
 			value = "unknown";
 	}

 	if (is_json_context()) {
 		print_string(PRINT_JSON, name, NULL, value);
 	} else {
 		SPRINT_BUF(b1);

 		snprintf(b1, sizeof(b1), "%s %%s ", name);
 		print_string(PRINT_FP, NULL, b1, value);
 	}
 }

 void tnl_print_gre_flags(__u8 proto,
 			 __be16 i_flags, __be16 o_flags,
 			 __be32 i_key, __be32 o_key)
 {
 	if ((i_flags & GRE_KEY) && (o_flags & GRE_KEY) &&
 	    o_key == i_key) {
 		print_uint(PRINT_ANY, "key", " key %u", ntohl(i_key));
 	} else {
 		if (i_flags & GRE_KEY)
 			print_uint(PRINT_ANY, "ikey", " ikey %u", ntohl(i_key));
 		if (o_flags & GRE_KEY)
 			print_uint(PRINT_ANY, "okey", " okey %u", ntohl(o_key));
 	}

 	if (proto != IPPROTO_GRE)
 		return;

 	open_json_array(PRINT_JSON, "flags");
 	if (i_flags & GRE_SEQ) {
 		if (is_json_context())
 			print_string(PRINT_JSON, NULL, "%s", "rx_drop_ooseq");
 		else
 			printf("%s  Drop packets out of sequence.", _SL_);
 	}
 	if (i_flags & GRE_CSUM) {
 		if (is_json_context())
 			print_string(PRINT_JSON, NULL, "%s", "rx_csum");
 		else
 			printf("%s  Checksum in received packet is required.", _SL_);
 	}
 	if (o_flags & GRE_SEQ) {
 		if (is_json_context())
 			print_string(PRINT_JSON, NULL, "%s", "tx_seq");
 		else
 			printf("%s  Sequence packets on output.", _SL_);
 	}
 	if (o_flags & GRE_CSUM) {
 		if (is_json_context())
 			print_string(PRINT_JSON, NULL, "%s", "tx_csum");
 		else
 			printf("%s  Checksum output packets.", _SL_);
 	}
 	close_json_array(PRINT_JSON, NULL);
 }

 static void tnl_print_stats(const struct rtnl_link_stats64 *s)
 {
 	printf("%s", _SL_);
 	printf("RX: Packets    Bytes        Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
 	printf("    %-10lld %-12lld %-6lld %-8lld %-8lld %-8lld%s",
 	       s->rx_packets, s->rx_bytes, s->rx_errors, s->rx_frame_errors,
 	       s->rx_fifo_errors, s->multicast, _SL_);
 	printf("TX: Packets    Bytes        Errors DeadLoop NoRoute  NoBufs%s", _SL_);
 	printf("    %-10lld %-12lld %-6lld %-8lld %-8lld %-6lld",
 	       s->tx_packets, s->tx_bytes, s->tx_errors, s->collisions,
 	       s->tx_carrier_errors, s->tx_dropped);
 }

 static int print_nlmsg_tunnel(struct nlmsghdr *n, void *arg)
 {
 	struct tnl_print_nlmsg_info *info = arg;
 	struct ifinfomsg *ifi = NLMSG_DATA(n);
 	struct rtattr *tb[IFLA_MAX+1];
 	const char *name, *n1;

 	if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
 		return 0;

 	if (n->nlmsg_len < NLMSG_LENGTH(sizeof(*ifi)))
 		return -1;

 	if (preferred_family == AF_INET) {
 		switch (ifi->ifi_type) {
 		case ARPHRD_TUNNEL:
 		case ARPHRD_IPGRE:
 		case ARPHRD_SIT:
 			break;
 		default:
 			return 0;
 		}
 	} else {
 		switch (ifi->ifi_type) {
 		case ARPHRD_TUNNEL6:
 		case ARPHRD_IP6GRE:
 			break;
 		default:
 			return 0;
 		}
 	}

 	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));

 	if (!tb[IFLA_IFNAME])
 		return 0;

 	name = rta_getattr_str(tb[IFLA_IFNAME]);

 	/* Assume p1->name[IFNAMSIZ] is first field of structure */
 	n1 = info->p1;
 	if (n1[0] && strcmp(n1, name))
 		return 0;

 	info->ifi = ifi;
 	info->init(info);

 	/* TODO: parse netlink attributes */
 	if (tnl_get_ioctl(name, info->p2))
 		return 0;

 	if (!info->match(info))
 		return 0;

 	info->print(info->p2);
 	if (show_stats) {
 		struct rtnl_link_stats64 s;

 		if (get_rtnl_link_stats_rta(&s, tb) <= 0)
 			return -1;

 		tnl_print_stats(&s);
 	}
 	fputc('\n', stdout);

 	return 0;
 }

 int do_tunnels_list(struct tnl_print_nlmsg_info *info)
 {
 	new_json_obj(json);
 	if (rtnl_linkdump_req(&rth, preferred_family) < 0) {
 		perror("Cannot send dump request\n");
 		return -1;
 	}

 	if (rtnl_dump_filter(&rth, print_nlmsg_tunnel, info) < 0) {
 		fprintf(stderr, "Dump terminated\n");
 		return -1;
 	}
 	delete_json_obj();

 	return 0;
 }
	/*
	* Copyright (C)2006 USAGI/WIDE Project
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <http://www.gnu.org/licenses>.
	*/
	/*
	* split from ip_tunnel.c
	*/
	/*
	* Author:
	* Masahide NAKAMURA @USAGI
	*/

	#include <stdio.h>
	#include <string.h>
	#include <unistd.h>
	#include <errno.h>
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <sys/ioctl.h>
	#include <netinet/in.h>
	#include <linux/if.h>
	#include <linux/ip.h>
	#include <linux/if_tunnel.h>
	#include <linux/if_arp.h>

	#include "utils.h"
	#include "tunnel.h"
	#include "json_print.h"

	const char *tnl_strproto(__u8 proto)
	{
	switch (proto) {
	case IPPROTO_IPIP:
	return "ip";
	case IPPROTO_GRE:
	return "gre";
	case IPPROTO_IPV6:
	return "ipv6";
	case IPPROTO_ESP:
	return "esp";
	case IPPROTO_MPLS:
	return "mpls";
	case 0:
	return "any";
	default:
	return "unknown";
	}
	}

	int tnl_get_ioctl(const char basedev, void p)
	{
	struct ifreq ifr;
	int fd;
	int err;

	strlcpy(ifr.ifr_name, basedev, IFNAMSIZ);
	ifr.ifr_ifru.ifru_data = (void *)p;

	fd = socket(preferred_family, SOCK_DGRAM, 0);
	if (fd < 0) {
	fprintf(stderr, "create socket failed: %s\n", strerror(errno));
	return -1;
	}

	err = ioctl(fd, SIOCGETTUNNEL, &ifr);
	if (err)
	fprintf(stderr, "get tunnel \"%s\" failed: %s\n", basedev,
	strerror(errno));

	close(fd);
	return err;
	}

	int tnl_add_ioctl(int cmd, const char basedev, const char name, void *p)
	{
	struct ifreq ifr;
	int fd;
	int err;

	if (cmd == SIOCCHGTUNNEL && name[0])
	strlcpy(ifr.ifr_name, name, IFNAMSIZ);
	else
	strlcpy(ifr.ifr_name, basedev, IFNAMSIZ);
	ifr.ifr_ifru.ifru_data = p;

	fd = socket(preferred_family, SOCK_DGRAM, 0);
	if (fd < 0) {
	fprintf(stderr, "create socket failed: %s\n", strerror(errno));
	return -1;
	}

	err = ioctl(fd, cmd, &ifr);
	if (err)
	fprintf(stderr, "add tunnel \"%s\" failed: %s\n", ifr.ifr_name,
	strerror(errno));
	close(fd);
	return err;
	}

	int tnl_del_ioctl(const char basedev, const char name, void *p)
	{
	struct ifreq ifr;
	int fd;
	int err;

	if (name[0])
	strlcpy(ifr.ifr_name, name, IFNAMSIZ);
	else
	strlcpy(ifr.ifr_name, basedev, IFNAMSIZ);

	ifr.ifr_ifru.ifru_data = p;

	fd = socket(preferred_family, SOCK_DGRAM, 0);
	if (fd < 0) {
	fprintf(stderr, "create socket failed: %s\n", strerror(errno));
	return -1;
	}

	err = ioctl(fd, SIOCDELTUNNEL, &ifr);
	if (err)
	fprintf(stderr, "delete tunnel \"%s\" failed: %s\n",
	ifr.ifr_name, strerror(errno));
	close(fd);
	return err;
	}

	static int tnl_gen_ioctl(int cmd, const char *name,
	void *p, int skiperr)
	{
	struct ifreq ifr;
	int fd;
	int err;

	strlcpy(ifr.ifr_name, name, IFNAMSIZ);
	ifr.ifr_ifru.ifru_data = p;

	fd = socket(preferred_family, SOCK_DGRAM, 0);
	if (fd < 0) {
	fprintf(stderr, "create socket failed: %s\n", strerror(errno));
	return -1;
	}

	err = ioctl(fd, cmd, &ifr);
	if (err && errno != skiperr)
	fprintf(stderr, "%s: ioctl %x failed: %s\n", name,
	cmd, strerror(errno));
	close(fd);
	return err;
	}

	int tnl_prl_ioctl(int cmd, const char name, void p)
	{
	return tnl_gen_ioctl(cmd, name, p, -1);
	}

	int tnl_6rd_ioctl(int cmd, const char name, void p)
	{
	return tnl_gen_ioctl(cmd, name, p, -1);
	}

	int tnl_ioctl_get_6rd(const char name, void p)
	{
	return tnl_gen_ioctl(SIOCGET6RD, name, p, EINVAL);
	}

	__be32 tnl_parse_key(const char name, const char key)
	{
	unsigned int uval;

	if (strchr(key, '.'))
	return get_addr32(key);

	if (get_unsigned(&uval, key, 0) < 0) {
	fprintf(stderr,
	"invalid value for \"%s\": \"%s\"; it should be an unsigned integer\n",
	name, key);
	exit(-1);
	}
	return htonl(uval);
	}

	static const char tnl_encap_str(const char name, int enabled, int port)
	{
	static const char ne[][sizeof("no")] = {
	[0] = "no",
	[1] = "",
	};
	static char buf[32];
	char b1[16];
	const char *val;

	if (!port) {
	val = "auto ";
	} else if (port < 0) {
	val = "";
	} else {
	snprintf(b1, sizeof(b1), "%u ", port - 1);
	val = b1;
	}

	snprintf(buf, sizeof(buf), "%sencap-%s %s", ne[!!enabled], name, val);
	return buf;
	}

	void tnl_print_encap(struct rtattr *tb[],
	int encap_type, int encap_flags,
	int encap_sport, int encap_dport)
	{
	__u16 type, flags, sport, dport;

	if (!tb[encap_type])
	return;

	type = rta_getattr_u16(tb[encap_type]);
	if (type == TUNNEL_ENCAP_NONE)
	return;

	flags = rta_getattr_u16(tb[encap_flags]);
	sport = rta_getattr_u16(tb[encap_sport]);
	dport = rta_getattr_u16(tb[encap_dport]);

	open_json_object("encap");
	print_string(PRINT_FP, NULL, "encap ", NULL);

	switch (type) {
	case TUNNEL_ENCAP_FOU:
	print_string(PRINT_ANY, "type", "%s ", "fou");
	break;
	case TUNNEL_ENCAP_GUE:
	print_string(PRINT_ANY, "type", "%s ", "gue");
	break;
	default:
	print_null(PRINT_ANY, "type", "%s ", "unknown");
	break;
	}

	if (is_json_context()) {
	print_uint(PRINT_JSON, "sport", NULL, ntohs(sport));
	print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
	print_bool(PRINT_JSON, "csum", NULL,
	flags & TUNNEL_ENCAP_FLAG_CSUM);
	print_bool(PRINT_JSON, "csum6", NULL,
	flags & TUNNEL_ENCAP_FLAG_CSUM6);
	print_bool(PRINT_JSON, "remcsum", NULL,
	flags & TUNNEL_ENCAP_FLAG_REMCSUM);
	close_json_object();
	} else {
	int t;

	t = sport ? ntohs(sport) + 1 : 0;
	print_string(PRINT_FP, NULL, "%s",
	tnl_encap_str("sport", 1, t));

	t = ntohs(dport) + 1;
	print_string(PRINT_FP, NULL, "%s",
	tnl_encap_str("dport", 1, t));

	t = flags & TUNNEL_ENCAP_FLAG_CSUM;
	print_string(PRINT_FP, NULL, "%s",
	tnl_encap_str("csum", t, -1));

	t = flags & TUNNEL_ENCAP_FLAG_CSUM6;
	print_string(PRINT_FP, NULL, "%s",
	tnl_encap_str("csum6", t, -1));

	t = flags & TUNNEL_ENCAP_FLAG_REMCSUM;
	print_string(PRINT_FP, NULL, "%s",
	tnl_encap_str("remcsum", t, -1));
	}
	}

	void tnl_print_endpoint(const char name, const struct rtattr rta, int family)
	{
	const char *value;
	inet_prefix dst;

	if (!rta) {
	value = "any";
	} else if (get_addr_rta(&dst, rta, family)) {
	value = "unknown";
	} else if (dst.flags & ADDRTYPE_UNSPEC) {
	value = "any";
	} else {
	value = format_host(family, dst.bytelen, dst.data);
	if (!value)
	value = "unknown";
	}

	if (is_json_context()) {
	print_string(PRINT_JSON, name, NULL, value);
	} else {
	SPRINT_BUF(b1);

	snprintf(b1, sizeof(b1), "%s %%s ", name);
	print_string(PRINT_FP, NULL, b1, value);
	}
	}

	void tnl_print_gre_flags(__u8 proto,
	__be16 i_flags, __be16 o_flags,
	__be32 i_key, __be32 o_key)
	{
	if ((i_flags & GRE_KEY) && (o_flags & GRE_KEY) &&
	o_key == i_key) {
	print_uint(PRINT_ANY, "key", " key %u", ntohl(i_key));
	} else {
	if (i_flags & GRE_KEY)
	print_uint(PRINT_ANY, "ikey", " ikey %u", ntohl(i_key));
	if (o_flags & GRE_KEY)
	print_uint(PRINT_ANY, "okey", " okey %u", ntohl(o_key));
	}

	if (proto != IPPROTO_GRE)
	return;

	open_json_array(PRINT_JSON, "flags");
	if (i_flags & GRE_SEQ) {
	if (is_json_context())
	print_string(PRINT_JSON, NULL, "%s", "rx_drop_ooseq");
	else
	printf("%s Drop packets out of sequence.", _SL_);
	}
	if (i_flags & GRE_CSUM) {
	if (is_json_context())
	print_string(PRINT_JSON, NULL, "%s", "rx_csum");
	else
	printf("%s Checksum in received packet is required.", _SL_);
	}
	if (o_flags & GRE_SEQ) {
	if (is_json_context())
	print_string(PRINT_JSON, NULL, "%s", "tx_seq");
	else
	printf("%s Sequence packets on output.", _SL_);
	}
	if (o_flags & GRE_CSUM) {
	if (is_json_context())
	print_string(PRINT_JSON, NULL, "%s", "tx_csum");
	else
	printf("%s Checksum output packets.", _SL_);
	}
	close_json_array(PRINT_JSON, NULL);
	}

	static void tnl_print_stats(const struct rtnl_link_stats64 *s)
	{
	printf("%s", _SL_);
	printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
	printf(" %-10lld %-12lld %-6lld %-8lld %-8lld %-8lld%s",
	s->rx_packets, s->rx_bytes, s->rx_errors, s->rx_frame_errors,
	s->rx_fifo_errors, s->multicast, _SL_);
	printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_);
	printf(" %-10lld %-12lld %-6lld %-8lld %-8lld %-6lld",
	s->tx_packets, s->tx_bytes, s->tx_errors, s->collisions,
	s->tx_carrier_errors, s->tx_dropped);
	}

	static int print_nlmsg_tunnel(struct nlmsghdr n, void arg)
	{
	struct tnl_print_nlmsg_info *info = arg;
	struct ifinfomsg *ifi = NLMSG_DATA(n);
	struct rtattr *tb[IFLA_MAX+1];
	const char name, n1;

	if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
	return 0;

	if (n->nlmsg_len < NLMSG_LENGTH(sizeof(*ifi)))
	return -1;

	if (preferred_family == AF_INET) {
	switch (ifi->ifi_type) {
	case ARPHRD_TUNNEL:
	case ARPHRD_IPGRE:
	case ARPHRD_SIT:
	break;
	default:
	return 0;
	}
	} else {
	switch (ifi->ifi_type) {
	case ARPHRD_TUNNEL6:
	case ARPHRD_IP6GRE:
	break;
	default:
	return 0;
	}
	}

	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));

	if (!tb[IFLA_IFNAME])
	return 0;

	name = rta_getattr_str(tb[IFLA_IFNAME]);

	/* Assume p1->name[IFNAMSIZ] is first field of structure */
	n1 = info->p1;
	if (n1[0] && strcmp(n1, name))
	return 0;

	info->ifi = ifi;
	info->init(info);

	/* TODO: parse netlink attributes */
	if (tnl_get_ioctl(name, info->p2))
	return 0;

	if (!info->match(info))
	return 0;

	info->print(info->p2);
	if (show_stats) {
	struct rtnl_link_stats64 s;

	if (get_rtnl_link_stats_rta(&s, tb) <= 0)
	return -1;

	tnl_print_stats(&s);
	}
	fputc('\n', stdout);

	return 0;
	}

	int do_tunnels_list(struct tnl_print_nlmsg_info *info)
	{
	new_json_obj(json);
	if (rtnl_linkdump_req(&rth, preferred_family) < 0) {
	perror("Cannot send dump request\n");
	return -1;
	}

	if (rtnl_dump_filter(&rth, print_nlmsg_tunnel, info) < 0) {
	fprintf(stderr, "Dump terminated\n");
	return -1;
	}
	delete_json_obj();

	return 0;
	}