ip/link_ip6tnl.c - platform/external/iproute2 - Gitiles

 /*
  * link_ip6tnl.c	ip6tnl driver module
  *
  *		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:	Nicolas Dichtel <nicolas.dichtel@6wind.com>
  *
  */

 #include <string.h>
 #include <net/if.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>

 #include <linux/ip.h>
 #include <linux/if_tunnel.h>
 #include <linux/ip6_tunnel.h>
 #include "rt_names.h"
 #include "utils.h"
 #include "ip_common.h"
 #include "tunnel.h"

 #define IP6_FLOWINFO_TCLASS	htonl(0x0FF00000)
 #define IP6_FLOWINFO_FLOWLABEL	htonl(0x000FFFFF)

 #define DEFAULT_TNL_HOP_LIMIT	(64)

 static void print_usage(FILE *f)
 {
 	fprintf(f, "Usage: ip link { add | set | change | replace | del } NAME\n");
 	fprintf(f, "          [ mode { ip6ip6 | ipip6 | any } ]\n");
 	fprintf(f, "          type ip6tnl [ remote ADDR ] [ local ADDR ]\n");
 	fprintf(f, "          [ dev PHYS_DEV ] [ encaplimit ELIM ]\n");
 	fprintf(f ,"          [ hoplimit HLIM ] [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n");
 	fprintf(f, "          [ dscp inherit ] [ fwmark inherit ]\n");
 	fprintf(f, "\n");
 	fprintf(f, "Where: NAME      := STRING\n");
 	fprintf(f, "       ADDR      := IPV6_ADDRESS\n");
 	fprintf(f, "       ELIM      := { none | 0..255 }(default=%d)\n",
 		IPV6_DEFAULT_TNL_ENCAP_LIMIT);
 	fprintf(f, "       HLIM      := 0..255 (default=%d)\n",
 		DEFAULT_TNL_HOP_LIMIT);
 	fprintf(f, "       TCLASS    := { 0x0..0xff | inherit }\n");
 	fprintf(f, "       FLOWLABEL := { 0x0..0xfffff | inherit }\n");
 }

 static void usage(void) __attribute__((noreturn));
 static void usage(void)
 {
 	print_usage(stderr);
 	exit(-1);
 }

 static int ip6tunnel_parse_opt(struct link_util *lu, int argc, char **argv,
 			       struct nlmsghdr *n)
 {
 	struct {
 		struct nlmsghdr n;
 		struct ifinfomsg i;
 		char buf[2048];
 	} req;
 	struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
 	struct rtattr *tb[IFLA_MAX + 1];
 	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
 	struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
 	int len;
 	struct in6_addr laddr;
 	struct in6_addr raddr;
 	__u8 hop_limit = DEFAULT_TNL_HOP_LIMIT;
 	__u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
 	__u32 flowinfo = 0;
 	__u32 flags = 0;
 	__u32 link = 0;
 	__u8 proto = 0;

 	memset(&laddr, 0, sizeof(laddr));
 	memset(&raddr, 0, sizeof(raddr));

 	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
 		memset(&req, 0, sizeof(req));

 		req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
 		req.n.nlmsg_flags = NLM_F_REQUEST;
 		req.n.nlmsg_type = RTM_GETLINK;
 		req.i.ifi_family = preferred_family;
 		req.i.ifi_index = ifi->ifi_index;

 		if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0) {
 get_failed:
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
 			return -1;
 		}

 		len = req.n.nlmsg_len;
 		len -= NLMSG_LENGTH(sizeof(*ifi));
 		if (len < 0)
 			goto get_failed;

 		parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);

 		if (!tb[IFLA_LINKINFO])
 			goto get_failed;

 		parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);

 		if (!linkinfo[IFLA_INFO_DATA])
 			goto get_failed;

 		parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
 				    linkinfo[IFLA_INFO_DATA]);

 		if (iptuninfo[IFLA_IPTUN_LOCAL])
 			memcpy(&laddr, RTA_DATA(iptuninfo[IFLA_IPTUN_LOCAL]),
 			       sizeof(laddr));

 		if (iptuninfo[IFLA_IPTUN_REMOTE])
 			memcpy(&raddr, RTA_DATA(iptuninfo[IFLA_IPTUN_REMOTE]),
 			       sizeof(raddr));

 		if (iptuninfo[IFLA_IPTUN_TTL])
 			hop_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);

 		if (iptuninfo[IFLA_IPTUN_ENCAP_LIMIT])
 			encap_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]);

 		if (iptuninfo[IFLA_IPTUN_FLOWINFO])
 			flowinfo = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLOWINFO]);

 		if (iptuninfo[IFLA_IPTUN_FLAGS])
 			flags = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLAGS]);

 		if (iptuninfo[IFLA_IPTUN_LINK])
 			link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);

 		if (iptuninfo[IFLA_IPTUN_PROTO])
 			proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
 	}

 	while (argc > 0) {
 		if (matches(*argv, "mode") == 0) {
 			NEXT_ARG();
 			if (strcmp(*argv, "ipv6/ipv6") == 0 ||
 			    strcmp(*argv, "ip6ip6") == 0)
 				proto = IPPROTO_IPV6;
 			else if (strcmp(*argv, "ip/ipv6") == 0 ||
 				 strcmp(*argv, "ipv4/ipv6") == 0 ||
 				 strcmp(*argv, "ipip6") == 0 ||
 				 strcmp(*argv, "ip4ip6") == 0)
 				proto = IPPROTO_IPIP;
 			else if (strcmp(*argv, "any/ipv6") == 0 ||
 				 strcmp(*argv, "any") == 0)
 				proto = 0;
 			else
 				invarg("Cannot guess tunnel mode.", *argv);
 		} else if (strcmp(*argv, "remote") == 0) {
 			inet_prefix addr;
 			NEXT_ARG();
 			get_prefix(&addr, *argv, preferred_family);
 			if (addr.family == AF_UNSPEC)
 				invarg("\"remote\" address family is AF_UNSPEC", *argv);
 			memcpy(&raddr, addr.data, addr.bytelen);
 		} else if (strcmp(*argv, "local") == 0) {
 			inet_prefix addr;
 			NEXT_ARG();
 			get_prefix(&addr, *argv, preferred_family);
 			if (addr.family == AF_UNSPEC)
 				invarg("\"local\" address family is AF_UNSPEC", *argv);
 			memcpy(&laddr, addr.data, addr.bytelen);
 		} else if (matches(*argv, "dev") == 0) {
 			NEXT_ARG();
 			link = if_nametoindex(*argv);
 			if (link == 0)
 				invarg("\"dev\" is invalid", *argv);
 		} else if (strcmp(*argv, "hoplimit") == 0 ||
 			   strcmp(*argv, "ttl") == 0 ||
 			   strcmp(*argv, "hlim") == 0) {
 			__u8 uval;
 			NEXT_ARG();
 			if (get_u8(&uval, *argv, 0))
 				invarg("invalid HLIM", *argv);
 			hop_limit = uval;
 		} else if (matches(*argv, "encaplimit") == 0) {
 			NEXT_ARG();
 			if (strcmp(*argv, "none") == 0) {
 				flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
 			} else {
 				__u8 uval;
 				if (get_u8(&uval, *argv, 0) < -1)
 					invarg("invalid ELIM", *argv);
 				encap_limit = uval;
 				flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
 			}
 		} else if (strcmp(*argv, "tclass") == 0 ||
 			   strcmp(*argv, "tc") == 0 ||
 			   strcmp(*argv, "tos") == 0 ||
 			   matches(*argv, "dsfield") == 0) {
 			__u8 uval;
 			NEXT_ARG();
 			flowinfo &= ~IP6_FLOWINFO_TCLASS;
 			if (strcmp(*argv, "inherit") == 0)
 				flags |= IP6_TNL_F_USE_ORIG_TCLASS;
 			else {
 				if (get_u8(&uval, *argv, 16))
 					invarg("invalid TClass", *argv);
 				flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
 				flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
 			}
 		} else if (strcmp(*argv, "flowlabel") == 0 ||
 			   strcmp(*argv, "fl") == 0) {
 			__u32 uval;
 			NEXT_ARG();
 			flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
 			if (strcmp(*argv, "inherit") == 0)
 				flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
 			else {
 				if (get_u32(&uval, *argv, 16))
 					invarg("invalid Flowlabel", *argv);
 				if (uval > 0xFFFFF)
 					invarg("invalid Flowlabel", *argv);
 				flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
 				flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
 			}
 		} else if (strcmp(*argv, "dscp") == 0) {
 			NEXT_ARG();
 			if (strcmp(*argv, "inherit") != 0)
 				invarg("not inherit", *argv);
 			flags |= IP6_TNL_F_RCV_DSCP_COPY;
 		} else if (strcmp(*argv, "fwmark") == 0) {
 			NEXT_ARG();
 			if (strcmp(*argv, "inherit") != 0)
 				invarg("not inherit", *argv);
 			flags |= IP6_TNL_F_USE_ORIG_FWMARK;
 		} else
 			usage();
 		argc--, argv++;
 	}

 	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
 	addattr_l(n, 1024, IFLA_IPTUN_LOCAL, &laddr, sizeof(laddr));
 	addattr_l(n, 1024, IFLA_IPTUN_REMOTE, &raddr, sizeof(raddr));
 	addattr8(n, 1024, IFLA_IPTUN_TTL, hop_limit);
 	addattr8(n, 1024, IFLA_IPTUN_ENCAP_LIMIT, encap_limit);
 	addattr32(n, 1024, IFLA_IPTUN_FLOWINFO, flowinfo);
 	addattr32(n, 1024, IFLA_IPTUN_FLAGS, flags);
 	addattr32(n, 1024, IFLA_IPTUN_LINK, link);

 	return 0;
 }

 static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 {
 	char s1[256];
 	char s2[64];
 	int flags = 0;
 	__u32 flowinfo = 0;

 	if (!tb)
 		return;

 	if (tb[IFLA_IPTUN_FLAGS])
 		flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]);

 	if (tb[IFLA_IPTUN_FLOWINFO])
 		flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]);

 	if (tb[IFLA_IPTUN_PROTO]) {
 		switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
 		case IPPROTO_IPIP:
 			fprintf(f, "ipip6 ");
 			break;
 		case IPPROTO_IPV6:
 			fprintf(f, "ip6ip6 ");
 			break;
 		case 0:
 			fprintf(f, "any ");
 			break;
 		}
 	}

 	if (tb[IFLA_IPTUN_REMOTE]) {
 		fprintf(f, "remote %s ",
 			rt_addr_n2a(AF_INET6,
 				    RTA_DATA(tb[IFLA_IPTUN_REMOTE]),
 				    s1, sizeof(s1)));
 	}

 	if (tb[IFLA_IPTUN_LOCAL]) {
 		fprintf(f, "local %s ",
 			rt_addr_n2a(AF_INET6,
 				    RTA_DATA(tb[IFLA_IPTUN_LOCAL]),
 				    s1, sizeof(s1)));
 	}

 	if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) {
 		unsigned link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
 		const char *n = if_indextoname(link, s2);

 		if (n)
 			fprintf(f, "dev %s ", n);
 		else
 			fprintf(f, "dev %u ", link);
 	}

 	if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
 		printf("encaplimit none ");
 	else if (tb[IFLA_IPTUN_ENCAP_LIMIT])
 		fprintf(f, "encaplimit %u ",
 			rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]));

 	if (tb[IFLA_IPTUN_TTL])
 		fprintf(f, "hoplimit %u ", rta_getattr_u8(tb[IFLA_IPTUN_TTL]));

 	if (flags & IP6_TNL_F_USE_ORIG_TCLASS)
 		printf("tclass inherit ");
 	else if (tb[IFLA_IPTUN_FLOWINFO]) {
 		__u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS);

 		printf("tclass 0x%02x ", (__u8)(val >> 20));
 	}

 	if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 		printf("flowlabel inherit ");
 	else
 		printf("flowlabel 0x%05x ", ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));

 	printf("(flowinfo 0x%08x) ", ntohl(flowinfo));

 	if (flags & IP6_TNL_F_RCV_DSCP_COPY)
 		printf("dscp inherit ");

 	if (flags & IP6_TNL_F_MIP6_DEV)
 		fprintf(f, "mip6 ");

 	if (flags & IP6_TNL_F_USE_ORIG_FWMARK)
 		fprintf(f, "fwmark inherit ");
 }

 static void ip6tunnel_print_help(struct link_util *lu, int argc, char **argv,
 	FILE *f)
 {
 	print_usage(f);
 }

 struct link_util ip6tnl_link_util = {
 	.id = "ip6tnl",
 	.maxattr = IFLA_IPTUN_MAX,
 	.parse_opt = ip6tunnel_parse_opt,
 	.print_opt = ip6tunnel_print_opt,
 	.print_help = ip6tunnel_print_help,
 };
	/*
	* link_ip6tnl.c ip6tnl driver module
	*
	* 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: Nicolas Dichtel <nicolas.dichtel@6wind.com>
	*
	*/

	#include <string.h>
	#include <net/if.h>
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <arpa/inet.h>

	#include <linux/ip.h>
	#include <linux/if_tunnel.h>
	#include <linux/ip6_tunnel.h>
	#include "rt_names.h"
	#include "utils.h"
	#include "ip_common.h"
	#include "tunnel.h"

	#define IP6_FLOWINFO_TCLASS htonl(0x0FF00000)
	#define IP6_FLOWINFO_FLOWLABEL htonl(0x000FFFFF)

	#define DEFAULT_TNL_HOP_LIMIT (64)

	static void print_usage(FILE *f)
	{
	fprintf(f, "Usage: ip link { add \| set \| change \| replace \| del } NAME\n");
	fprintf(f, " [ mode { ip6ip6 \| ipip6 \| any } ]\n");
	fprintf(f, " type ip6tnl [ remote ADDR ] [ local ADDR ]\n");
	fprintf(f, " [ dev PHYS_DEV ] [ encaplimit ELIM ]\n");
	fprintf(f ," [ hoplimit HLIM ] [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n");
	fprintf(f, " [ dscp inherit ] [ fwmark inherit ]\n");
	fprintf(f, "\n");
	fprintf(f, "Where: NAME := STRING\n");
	fprintf(f, " ADDR := IPV6_ADDRESS\n");
	fprintf(f, " ELIM := { none \| 0..255 }(default=%d)\n",
	IPV6_DEFAULT_TNL_ENCAP_LIMIT);
	fprintf(f, " HLIM := 0..255 (default=%d)\n",
	DEFAULT_TNL_HOP_LIMIT);
	fprintf(f, " TCLASS := { 0x0..0xff \| inherit }\n");
	fprintf(f, " FLOWLABEL := { 0x0..0xfffff \| inherit }\n");
	}

	static void usage(void) __attribute__((noreturn));
	static void usage(void)
	{
	print_usage(stderr);
	exit(-1);
	}

	static int ip6tunnel_parse_opt(struct link_util lu, int argc, char *argv,
	struct nlmsghdr *n)
	{
	struct {
	struct nlmsghdr n;
	struct ifinfomsg i;
	char buf[2048];
	} req;
	struct ifinfomsg ifi = (struct ifinfomsg )(n + 1);
	struct rtattr *tb[IFLA_MAX + 1];
	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
	struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
	int len;
	struct in6_addr laddr;
	struct in6_addr raddr;
	__u8 hop_limit = DEFAULT_TNL_HOP_LIMIT;
	__u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
	__u32 flowinfo = 0;
	__u32 flags = 0;
	__u32 link = 0;
	__u8 proto = 0;

	memset(&laddr, 0, sizeof(laddr));
	memset(&raddr, 0, sizeof(raddr));

	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
	memset(&req, 0, sizeof(req));

	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
	req.n.nlmsg_flags = NLM_F_REQUEST;
	req.n.nlmsg_type = RTM_GETLINK;
	req.i.ifi_family = preferred_family;
	req.i.ifi_index = ifi->ifi_index;

	if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0) {
	get_failed:
	fprintf(stderr,
	"Failed to get existing tunnel info.\n");
	return -1;
	}

	len = req.n.nlmsg_len;
	len -= NLMSG_LENGTH(sizeof(*ifi));
	if (len < 0)
	goto get_failed;

	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);

	if (!tb[IFLA_LINKINFO])
	goto get_failed;

	parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);

	if (!linkinfo[IFLA_INFO_DATA])
	goto get_failed;

	parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
	linkinfo[IFLA_INFO_DATA]);

	if (iptuninfo[IFLA_IPTUN_LOCAL])
	memcpy(&laddr, RTA_DATA(iptuninfo[IFLA_IPTUN_LOCAL]),
	sizeof(laddr));

	if (iptuninfo[IFLA_IPTUN_REMOTE])
	memcpy(&raddr, RTA_DATA(iptuninfo[IFLA_IPTUN_REMOTE]),
	sizeof(raddr));

	if (iptuninfo[IFLA_IPTUN_TTL])
	hop_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);

	if (iptuninfo[IFLA_IPTUN_ENCAP_LIMIT])
	encap_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]);

	if (iptuninfo[IFLA_IPTUN_FLOWINFO])
	flowinfo = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLOWINFO]);

	if (iptuninfo[IFLA_IPTUN_FLAGS])
	flags = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLAGS]);

	if (iptuninfo[IFLA_IPTUN_LINK])
	link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);

	if (iptuninfo[IFLA_IPTUN_PROTO])
	proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
	}

	while (argc > 0) {
	if (matches(*argv, "mode") == 0) {
	NEXT_ARG();
	if (strcmp(*argv, "ipv6/ipv6") == 0 \|\|
	strcmp(*argv, "ip6ip6") == 0)
	proto = IPPROTO_IPV6;
	else if (strcmp(*argv, "ip/ipv6") == 0 \|\|
	strcmp(*argv, "ipv4/ipv6") == 0 \|\|
	strcmp(*argv, "ipip6") == 0 \|\|
	strcmp(*argv, "ip4ip6") == 0)
	proto = IPPROTO_IPIP;
	else if (strcmp(*argv, "any/ipv6") == 0 \|\|
	strcmp(*argv, "any") == 0)
	proto = 0;
	else
	invarg("Cannot guess tunnel mode.", *argv);
	} else if (strcmp(*argv, "remote") == 0) {
	inet_prefix addr;
	NEXT_ARG();
	get_prefix(&addr, *argv, preferred_family);
	if (addr.family == AF_UNSPEC)
	invarg("\"remote\" address family is AF_UNSPEC", *argv);
	memcpy(&raddr, addr.data, addr.bytelen);
	} else if (strcmp(*argv, "local") == 0) {
	inet_prefix addr;
	NEXT_ARG();
	get_prefix(&addr, *argv, preferred_family);
	if (addr.family == AF_UNSPEC)
	invarg("\"local\" address family is AF_UNSPEC", *argv);
	memcpy(&laddr, addr.data, addr.bytelen);
	} else if (matches(*argv, "dev") == 0) {
	NEXT_ARG();
	link = if_nametoindex(*argv);
	if (link == 0)
	invarg("\"dev\" is invalid", *argv);
	} else if (strcmp(*argv, "hoplimit") == 0 \|\|
	strcmp(*argv, "ttl") == 0 \|\|
	strcmp(*argv, "hlim") == 0) {
	__u8 uval;
	NEXT_ARG();
	if (get_u8(&uval, *argv, 0))
	invarg("invalid HLIM", *argv);
	hop_limit = uval;
	} else if (matches(*argv, "encaplimit") == 0) {
	NEXT_ARG();
	if (strcmp(*argv, "none") == 0) {
	flags \|= IP6_TNL_F_IGN_ENCAP_LIMIT;
	} else {
	__u8 uval;
	if (get_u8(&uval, *argv, 0) < -1)
	invarg("invalid ELIM", *argv);
	encap_limit = uval;
	flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
	}
	} else if (strcmp(*argv, "tclass") == 0 \|\|
	strcmp(*argv, "tc") == 0 \|\|
	strcmp(*argv, "tos") == 0 \|\|
	matches(*argv, "dsfield") == 0) {
	__u8 uval;
	NEXT_ARG();
	flowinfo &= ~IP6_FLOWINFO_TCLASS;
	if (strcmp(*argv, "inherit") == 0)
	flags \|= IP6_TNL_F_USE_ORIG_TCLASS;
	else {
	if (get_u8(&uval, *argv, 16))
	invarg("invalid TClass", *argv);
	flowinfo \|= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
	flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
	}
	} else if (strcmp(*argv, "flowlabel") == 0 \|\|
	strcmp(*argv, "fl") == 0) {
	__u32 uval;
	NEXT_ARG();
	flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
	if (strcmp(*argv, "inherit") == 0)
	flags \|= IP6_TNL_F_USE_ORIG_FLOWLABEL;
	else {
	if (get_u32(&uval, *argv, 16))
	invarg("invalid Flowlabel", *argv);
	if (uval > 0xFFFFF)
	invarg("invalid Flowlabel", *argv);
	flowinfo \|= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
	flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
	}
	} else if (strcmp(*argv, "dscp") == 0) {
	NEXT_ARG();
	if (strcmp(*argv, "inherit") != 0)
	invarg("not inherit", *argv);
	flags \|= IP6_TNL_F_RCV_DSCP_COPY;
	} else if (strcmp(*argv, "fwmark") == 0) {
	NEXT_ARG();
	if (strcmp(*argv, "inherit") != 0)
	invarg("not inherit", *argv);
	flags \|= IP6_TNL_F_USE_ORIG_FWMARK;
	} else
	usage();
	argc--, argv++;
	}

	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
	addattr_l(n, 1024, IFLA_IPTUN_LOCAL, &laddr, sizeof(laddr));
	addattr_l(n, 1024, IFLA_IPTUN_REMOTE, &raddr, sizeof(raddr));
	addattr8(n, 1024, IFLA_IPTUN_TTL, hop_limit);
	addattr8(n, 1024, IFLA_IPTUN_ENCAP_LIMIT, encap_limit);
	addattr32(n, 1024, IFLA_IPTUN_FLOWINFO, flowinfo);
	addattr32(n, 1024, IFLA_IPTUN_FLAGS, flags);
	addattr32(n, 1024, IFLA_IPTUN_LINK, link);

	return 0;
	}

	static void ip6tunnel_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	{
	char s1[256];
	char s2[64];
	int flags = 0;
	__u32 flowinfo = 0;

	if (!tb)
	return;

	if (tb[IFLA_IPTUN_FLAGS])
	flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]);

	if (tb[IFLA_IPTUN_FLOWINFO])
	flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]);

	if (tb[IFLA_IPTUN_PROTO]) {
	switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
	case IPPROTO_IPIP:
	fprintf(f, "ipip6 ");
	break;
	case IPPROTO_IPV6:
	fprintf(f, "ip6ip6 ");
	break;
	case 0:
	fprintf(f, "any ");
	break;
	}
	}

	if (tb[IFLA_IPTUN_REMOTE]) {
	fprintf(f, "remote %s ",
	rt_addr_n2a(AF_INET6,
	RTA_DATA(tb[IFLA_IPTUN_REMOTE]),
	s1, sizeof(s1)));
	}

	if (tb[IFLA_IPTUN_LOCAL]) {
	fprintf(f, "local %s ",
	rt_addr_n2a(AF_INET6,
	RTA_DATA(tb[IFLA_IPTUN_LOCAL]),
	s1, sizeof(s1)));
	}

	if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) {
	unsigned link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
	const char *n = if_indextoname(link, s2);

	if (n)
	fprintf(f, "dev %s ", n);
	else
	fprintf(f, "dev %u ", link);
	}

	if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
	printf("encaplimit none ");
	else if (tb[IFLA_IPTUN_ENCAP_LIMIT])
	fprintf(f, "encaplimit %u ",
	rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]));

	if (tb[IFLA_IPTUN_TTL])
	fprintf(f, "hoplimit %u ", rta_getattr_u8(tb[IFLA_IPTUN_TTL]));

	if (flags & IP6_TNL_F_USE_ORIG_TCLASS)
	printf("tclass inherit ");
	else if (tb[IFLA_IPTUN_FLOWINFO]) {
	__u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS);

	printf("tclass 0x%02x ", (__u8)(val >> 20));
	}

	if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
	printf("flowlabel inherit ");
	else
	printf("flowlabel 0x%05x ", ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));

	printf("(flowinfo 0x%08x) ", ntohl(flowinfo));

	if (flags & IP6_TNL_F_RCV_DSCP_COPY)
	printf("dscp inherit ");

	if (flags & IP6_TNL_F_MIP6_DEV)
	fprintf(f, "mip6 ");

	if (flags & IP6_TNL_F_USE_ORIG_FWMARK)
	fprintf(f, "fwmark inherit ");
	}

	static void ip6tunnel_print_help(struct link_util lu, int argc, char *argv,
	FILE *f)
	{
	print_usage(f);
	}

	struct link_util ip6tnl_link_util = {
	.id = "ip6tnl",
	.maxattr = IFLA_IPTUN_MAX,
	.parse_opt = ip6tunnel_parse_opt,
	.print_opt = ip6tunnel_print_opt,
	.print_help = ip6tunnel_print_help,
	};