From 0148deddeee0682884fe95b2ee4f58790498bf0a Mon Sep 17 00:00:00 2001

From: Phil Sutter <psutter@redhat.com>

Date: Mon, 3 Aug 2015 09:38:43 -0400

Subject: [PATCH] Consolidated tunnel support/fixes for ip6/gre and ip6_vti

The original patches are:

- iproute2: GRE over IPv6 tunnel support.

- Whitespace and indentation cleanup

- iproute2: Add support for IPv6 VTI tunnels to ip6tunnel

- ip tunnel: fix 'ip -oneline tunnel show' for some GRE tunnels

- iproute2: ip6_tunnel mode bugfixes: any,vti6

- iproute2: VTI6 support for ip -6 link command.

Conflicts:

	ip/ipaddress.c

- due to previous backport of 07fa9c1529 ("Add VF link state control")

- and missing 30b55792 ("iproute2: show counter of carrier on<->off transitions")

---

 ip/Makefile    |   5 +-

 ip/ip6tunnel.c | 138 ++++++++++++++++----

 ip/iplink.c    |  19 ++-

 ip/iptunnel.c  |   2 +-

 ip/link_gre6.c | 398 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++

 ip/link_vti6.c | 250 ++++++++++++++++++++++++++++++++++++

 6 files changed, 776 insertions(+), 36 deletions(-)

 create mode 100644 ip/link_gre6.c

 create mode 100644 ip/link_vti6.c

diff --git a/ip/Makefile b/ip/Makefile

index 48bd4a1..f377c37 100644

--- a/ip/Makefile

+++ b/ip/Makefile

@@ -3,9 +3,9 @@ IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o ipnetns.o \

     ipmaddr.o ipmonitor.o ipmroute.o ipprefix.o iptuntap.o iptoken.o \

     ipxfrm.o xfrm_state.o xfrm_policy.o xfrm_monitor.o \

     iplink_vlan.o link_veth.o link_gre.o iplink_can.o \

-    iplink_macvlan.o iplink_macvtap.o ipl2tp.o link_vti.o \

+    iplink_macvlan.o iplink_macvtap.o ipl2tp.o link_vti.o link_vti6.o \

     iplink_vxlan.o tcp_metrics.o iplink_ipoib.o ipnetconf.o link_ip6tnl.o \

-    link_iptnl.o

+    link_iptnl.o link_gre6.o

 RTMONOBJ=rtmon.o

@@ -23,7 +23,6 @@ all: $(TARGETS) $(SCRIPTS)

 ip: $(IPOBJ) $(LIBNETLINK)

-

 rtmon: $(RTMONOBJ)

 install: all

diff --git a/ip/ip6tunnel.c b/ip/ip6tunnel.c

index 216e982..f37042e 100644

--- a/ip/ip6tunnel.c

+++ b/ip/ip6tunnel.c

@@ -48,11 +48,12 @@ static void usage(void) __attribute__((noreturn));

 static void usage(void)

 {

 	fprintf(stderr, "Usage: ip -f inet6 tunnel { add | change | del | show } [ NAME ]\n");

-	fprintf(stderr, "          [ mode { ip6ip6 | ipip6 | any } ]\n");

+	fprintf(stderr, "          [ mode { ip6ip6 | ipip6 | ip6gre | vti6 | any } ]\n");

 	fprintf(stderr, "          [ remote ADDR local ADDR ] [ dev PHYS_DEV ]\n");

 	fprintf(stderr, "          [ encaplimit ELIM ]\n");

 	fprintf(stderr ,"          [ hoplimit TTL ] [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n");

 	fprintf(stderr, "          [ dscp inherit ]\n");

+	fprintf(stderr, "          [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");

 	fprintf(stderr, "\n");

 	fprintf(stderr, "Where: NAME      := STRING\n");

 	fprintf(stderr, "       ADDR      := IPV6_ADDRESS\n");

@@ -62,10 +63,11 @@ static void usage(void)

 		DEFAULT_TNL_HOP_LIMIT);

 	fprintf(stderr, "       TCLASS    := { 0x0..0xff | inherit }\n");

 	fprintf(stderr, "       FLOWLABEL := { 0x0..0xfffff | inherit }\n");

+	fprintf(stderr, "       KEY       := { DOTTED_QUAD | NUMBER }\n");

 	exit(-1);

 }

-static void print_tunnel(struct ip6_tnl_parm *p)

+static void print_tunnel(struct ip6_tnl_parm2 *p)

 {

 	char remote[64];

 	char local[64];

@@ -104,9 +106,29 @@ static void print_tunnel(struct ip6_tnl_parm *p)

 	if (p->flags & IP6_TNL_F_RCV_DSCP_COPY)

 		printf(" dscp inherit");

+

+	if (p->proto == IPPROTO_GRE) {

+		if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)

+			printf(" key %u", ntohl(p->i_key));

+		else if ((p->i_flags|p->o_flags)&GRE_KEY) {

+			if (p->i_flags&GRE_KEY)

+				printf(" ikey %u ", ntohl(p->i_key));

+			if (p->o_flags&GRE_KEY)

+				printf(" okey %u ", ntohl(p->o_key));

+		}

+

+		if (p->i_flags&GRE_SEQ)

+			printf("%s  Drop packets out of sequence.", _SL_);

+		if (p->i_flags&GRE_CSUM)

+			printf("%s  Checksum in received packet is required.", _SL_);

+		if (p->o_flags&GRE_SEQ)

+			printf("%s  Sequence packets on output.", _SL_);

+		if (p->o_flags&GRE_CSUM)

+			printf("%s  Checksum output packets.", _SL_);

+	}

 }

-static int parse_args(int argc, char **argv, int cmd, struct ip6_tnl_parm *p)

+static int parse_args(int argc, char **argv, int cmd, struct ip6_tnl_parm2 *p)

 {

 	int count = 0;

 	char medium[IFNAMSIZ];

@@ -119,19 +141,25 @@ static int parse_args(int argc, char **argv, int cmd, struct ip6_tnl_parm *p)

 			if (strcmp(*argv, "ipv6/ipv6") == 0 ||

 			    strcmp(*argv, "ip6ip6") == 0)

 				p->proto = IPPROTO_IPV6;

-			else if (strcmp(*argv, "ip/ipv6") == 0 ||

+			else if (strcmp(*argv, "vti6") == 0) {

+				p->proto = IPPROTO_IPV6;

+				p->i_flags |= VTI_ISVTI;

+			} else if (strcmp(*argv, "ip/ipv6") == 0 ||

 				 strcmp(*argv, "ipv4/ipv6") == 0 ||

 				 strcmp(*argv, "ipip6") == 0 ||

 				 strcmp(*argv, "ip4ip6") == 0)

 				p->proto = IPPROTO_IPIP;

+			else if (strcmp(*argv, "ip6gre") == 0 ||

+				 strcmp(*argv, "gre/ipv6") == 0)

+				p->proto = IPPROTO_GRE;

 			else if (strcmp(*argv, "any/ipv6") == 0 ||

 				 strcmp(*argv, "any") == 0)

 				p->proto = 0;

 			else {

-                                fprintf(stderr,"Unknown tunnel mode \"%s\"\n", *argv);

-                                exit(-1);

-                        }

-                } else if (strcmp(*argv, "remote") == 0) {

+				fprintf(stderr,"Unknown tunnel mode \"%s\"\n", *argv);

+				exit(-1);

+			}

+		} else if (strcmp(*argv, "remote") == 0) {

 			inet_prefix raddr;

 			NEXT_ARG();

 			get_prefix(&raddr, *argv, preferred_family);

@@ -202,6 +230,60 @@ static int parse_args(int argc, char **argv, int cmd, struct ip6_tnl_parm *p)

 			if (strcmp(*argv, "inherit") != 0)

 				invarg("not inherit", *argv);

 			p->flags |= IP6_TNL_F_RCV_DSCP_COPY;

+		} else if (strcmp(*argv, "key") == 0) {

+			unsigned uval;

+			NEXT_ARG();

+			p->i_flags |= GRE_KEY;

+			p->o_flags |= GRE_KEY;

+			if (strchr(*argv, '.'))

+				p->i_key = p->o_key = get_addr32(*argv);

+			else {

+				if (get_unsigned(&uval, *argv, 0) < 0) {

+					fprintf(stderr, "invalid value of \"key\"\n");

+					exit(-1);

+				}

+				p->i_key = p->o_key = htonl(uval);

+			}

+		} else if (strcmp(*argv, "ikey") == 0) {

+			unsigned uval;

+			NEXT_ARG();

+			p->i_flags |= GRE_KEY;

+			if (strchr(*argv, '.'))

+				p->i_key = get_addr32(*argv);

+			else {

+				if (get_unsigned(&uval, *argv, 0)<0) {

+					fprintf(stderr, "invalid value of \"ikey\"\n");

+					exit(-1);

+				}

+				p->i_key = htonl(uval);

+			}

+		} else if (strcmp(*argv, "okey") == 0) {

+			unsigned uval;

+			NEXT_ARG();

+			p->o_flags |= GRE_KEY;

+			if (strchr(*argv, '.'))

+				p->o_key = get_addr32(*argv);

+			else {

+				if (get_unsigned(&uval, *argv, 0)<0) {

+					fprintf(stderr, "invalid value of \"okey\"\n");

+					exit(-1);

+				}

+				p->o_key = htonl(uval);

+			}

+		} else if (strcmp(*argv, "seq") == 0) {

+			p->i_flags |= GRE_SEQ;

+			p->o_flags |= GRE_SEQ;

+		} else if (strcmp(*argv, "iseq") == 0) {

+			p->i_flags |= GRE_SEQ;

+		} else if (strcmp(*argv, "oseq") == 0) {

+			p->o_flags |= GRE_SEQ;

+		} else if (strcmp(*argv, "csum") == 0) {

+			p->i_flags |= GRE_CSUM;

+			p->o_flags |= GRE_CSUM;

+		} else if (strcmp(*argv, "icsum") == 0) {

+			p->i_flags |= GRE_CSUM;

+		} else if (strcmp(*argv, "ocsum") == 0) {

+			p->o_flags |= GRE_CSUM;

 		} else {

 			if (strcmp(*argv, "name") == 0) {

 				NEXT_ARG();

@@ -212,7 +294,7 @@ static int parse_args(int argc, char **argv, int cmd, struct ip6_tnl_parm *p)

 				duparg2("name", *argv);

 			strncpy(p->name, *argv, IFNAMSIZ - 1);

 			if (cmd == SIOCCHGTUNNEL && count == 0) {

-				struct ip6_tnl_parm old_p;

+				struct ip6_tnl_parm2 old_p;

 				memset(&old_p, 0, sizeof(old_p));

 				if (tnl_get_ioctl(*argv, &old_p))

 					return -1;

@@ -230,7 +312,7 @@ static int parse_args(int argc, char **argv, int cmd, struct ip6_tnl_parm *p)

 	return 0;

 }

-static void ip6_tnl_parm_init(struct ip6_tnl_parm *p, int apply_default)

+static void ip6_tnl_parm_init(struct ip6_tnl_parm2 *p, int apply_default)

 {

 	memset(p, 0, sizeof(*p));

 	p->proto = IPPROTO_IPV6;

@@ -244,8 +326,8 @@ static void ip6_tnl_parm_init(struct ip6_tnl_parm *p, int apply_default)

  * @p1: user specified parameter

  * @p2: database entry

  */

-static int ip6_tnl_parm_match(const struct ip6_tnl_parm *p1,

-			      const struct ip6_tnl_parm *p2)

+static int ip6_tnl_parm_match(const struct ip6_tnl_parm2 *p1,

+			      const struct ip6_tnl_parm2 *p2)

 {

 	return ((!p1->link || p1->link == p2->link) &&

 		(!p1->name[0] || strcmp(p1->name, p2->name) == 0) &&

@@ -263,7 +345,7 @@ static int ip6_tnl_parm_match(const struct ip6_tnl_parm *p1,

 		(!p1->flags || (p1->flags & p2->flags)));

 }

-static int do_tunnels_list(struct ip6_tnl_parm *p)

+static int do_tunnels_list(struct ip6_tnl_parm2 *p)

 {

 	char buf[512];

 	int err = -1;

@@ -287,7 +369,7 @@ static int do_tunnels_list(struct ip6_tnl_parm *p)

 			rx_fifo, rx_frame,

 			tx_bytes, tx_packets, tx_errs, tx_drops,

 			tx_fifo, tx_colls, tx_carrier, rx_multi;

-		struct ip6_tnl_parm p1;

+		struct ip6_tnl_parm2 p1;

 		char *ptr;

 		buf[sizeof(buf) - 1] = '\0';

@@ -312,10 +394,12 @@ static int do_tunnels_list(struct ip6_tnl_parm *p)

 			fprintf(stderr, "Failed to get type of \"%s\"\n", name);

 			continue;

 		}

-		if (type != ARPHRD_TUNNEL6)

+		if (type != ARPHRD_TUNNEL6 && type != ARPHRD_IP6GRE)

 			continue;

 		memset(&p1, 0, sizeof(p1));

 		ip6_tnl_parm_init(&p1, 0);

+		if (type == ARPHRD_IP6GRE)

+			p1.proto = IPPROTO_GRE;

 		strcpy(p1.name, name);

 		p1.link = ll_name_to_index(p1.name);

 		if (p1.link == 0)

@@ -346,7 +430,7 @@ static int do_tunnels_list(struct ip6_tnl_parm *p)

 static int do_show(int argc, char **argv)

 {

-        struct ip6_tnl_parm p;

+        struct ip6_tnl_parm2 p;

 	ll_init_map(&rth);

 	ip6_tnl_parm_init(&p, 0);

@@ -369,28 +453,38 @@ static int do_show(int argc, char **argv)

 static int do_add(int cmd, int argc, char **argv)

 {

-	struct ip6_tnl_parm p;

+	struct ip6_tnl_parm2 p;

+	const char *basedev = "ip6tnl0";

 	ip6_tnl_parm_init(&p, 1);

 	if (parse_args(argc, argv, cmd, &p) < 0)

 		return -1;

-	return tnl_add_ioctl(cmd,

-			     cmd == SIOCCHGTUNNEL && p.name[0] ?

-			     p.name : "ip6tnl0", p.name, &p);

+	if (p.proto == IPPROTO_GRE)

+		basedev = "ip6gre0";

+	else if (p.i_flags & VTI_ISVTI)

+		basedev = "ip6_vti0";

+

+	return tnl_add_ioctl(cmd, basedev, p.name, &p);

 }

 static int do_del(int argc, char **argv)

 {

-	struct ip6_tnl_parm p;

+	struct ip6_tnl_parm2 p;

+	const char *basedev = "ip6tnl0";

 	ip6_tnl_parm_init(&p, 1);

 	if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)

 		return -1;

-	return tnl_del_ioctl(p.name[0] ? p.name : "ip6tnl0", p.name, &p);

+	if (p.proto == IPPROTO_GRE)

+		basedev = "ip6gre0";

+	else if (p.i_flags & VTI_ISVTI)

+		basedev = "ip6_vti0";

+

+	return tnl_del_ioctl(basedev, p.name, &p);

 }

 int do_ip6tunnel(int argc, char **argv)

diff --git a/ip/iplink.c b/ip/iplink.c

index dc98019..deef14b 100644

--- a/ip/iplink.c

+++ b/ip/iplink.c

@@ -84,7 +84,8 @@ void iplink_usage(void)

 	if (iplink_have_newlink()) {

 		fprintf(stderr, "\n");

 		fprintf(stderr, "TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | can |\n");

-		fprintf(stderr, "          bridge | ipoib | ip6tnl | ipip | sit | vxlan }\n");

+		fprintf(stderr, "          bridge | ipoib | ip6tnl | ipip | sit | vxlan |\n");

+		fprintf(stderr, "          gre | gretap | ip6gre | ip6gretap }\n");

 	}

 	exit(-1);

 }

@@ -242,7 +243,7 @@ static int iplink_parse_vf(int vf, int *argcp, char ***argvp,

 			}

 			ivt.vf = vf;

 			addattr_l(&req->n, sizeof(*req), IFLA_VF_TX_RATE, &ivt, sizeof(ivt));

-		

+

 		} else if (matches(*argv, "spoofchk") == 0) {

 			struct ifla_vf_spoofchk ivs;

 			NEXT_ARG();

@@ -272,7 +273,6 @@ static int iplink_parse_vf(int vf, int *argcp, char ***argvp,

 	return 0;

 }

-

 int iplink_parse(int argc, char **argv, struct iplink_req *req,

 		char **name, char **type, char **link, char **dev, int *group)

 {

@@ -330,16 +330,16 @@ int iplink_parse(int argc, char **argv, struct iplink_req *req,

 			if (get_integer(&mtu, *argv, 0))

 				invarg("Invalid \"mtu\" value\n", *argv);

 			addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);

-                } else if (strcmp(*argv, "netns") == 0) {

-                        NEXT_ARG();

-                        if (netns != -1)

-                                duparg("netns", *argv);

+		} else if (strcmp(*argv, "netns") == 0) {

+			NEXT_ARG();

+			if (netns != -1)

+				duparg("netns", *argv);

 			if ((netns = get_netns_fd(*argv)) >= 0)

 				addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_FD, &netns, 4);

 			else if (get_integer(&netns, *argv, 0) == 0)

 				addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);

 			else

-                                invarg("Invalid \"netns\" value\n", *argv);

+				invarg("Invalid \"netns\" value\n", *argv);

 		} else if (strcmp(*argv, "multicast") == 0) {

 			NEXT_ARG();

 			req->i.ifi_change |= IFF_MULTICAST;

@@ -797,7 +797,6 @@ static int set_address(struct ifreq *ifr, int brd)

 	return 0;

 }

-

 static int do_set(int argc, char **argv)

 {

 	char *dev = NULL;

@@ -897,7 +896,7 @@ static int do_set(int argc, char **argv)

 			} else

 				return on_off("dynamic", *argv);

 		} else {

-                        if (strcmp(*argv, "dev") == 0) {

+			if (strcmp(*argv, "dev") == 0) {

 				NEXT_ARG();

 			}

 			if (matches(*argv, "help") == 0)

diff --git a/ip/iptunnel.c b/ip/iptunnel.c

index 43f8585..9099503 100644

--- a/ip/iptunnel.c

+++ b/ip/iptunnel.c

@@ -405,7 +405,7 @@ static void print_tunnel(struct ip_tunnel_parm *p)

 	}

 	if (p->i_flags&GRE_SEQ)

-		printf("%s  Drop packets out of sequence.\n", _SL_);

+		printf("%s  Drop packets out of sequence.", _SL_);

 	if (p->i_flags&GRE_CSUM)

 		printf("%s  Checksum in received packet is required.", _SL_);

 	if (p->o_flags&GRE_SEQ)

diff --git a/ip/link_gre6.c b/ip/link_gre6.c

new file mode 100644

index 0000000..4c9c536

--- /dev/null

+++ b/ip/link_gre6.c

@@ -0,0 +1,398 @@

+/*

+ * link_gre6.c	gre 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:	Dmitry Kozlov <xeb@mail.ru>

+ *

+ */

+

+#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 usage(void) __attribute__((noreturn));

+static void usage(void)

+{

+	fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n");

+	fprintf(stderr, "          type { ip6gre | ip6gretap } [ remote ADDR ] [ local ADDR ]\n");

+	fprintf(stderr, "          [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");

+	fprintf(stderr, "          [ hoplimit TTL ] [ encaplimit ELIM ]\n");

+	fprintf(stderr, "          [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n");

+	fprintf(stderr, "          [ dscp inherit ] [ dev PHYS_DEV ]\n");

+	fprintf(stderr, "\n");

+	fprintf(stderr, "Where: NAME      := STRING\n");

+	fprintf(stderr, "       ADDR      := IPV6_ADDRESS\n");

+	fprintf(stderr, "       TTL       := { 0..255 } (default=%d)\n",

+		DEFAULT_TNL_HOP_LIMIT);

+	fprintf(stderr, "       KEY       := { DOTTED_QUAD | NUMBER }\n");

+	fprintf(stderr, "       ELIM      := { none | 0..255 }(default=%d)\n",

+		IPV6_DEFAULT_TNL_ENCAP_LIMIT);

+	fprintf(stderr, "       TCLASS    := { 0x0..0xff | inherit }\n");

+	fprintf(stderr, "       FLOWLABEL := { 0x0..0xfffff | inherit }\n");

+	exit(-1);

+}

+

+static int gre_parse_opt(struct link_util *lu, int argc, char **argv,

+			 struct nlmsghdr *n)

+{

+	struct {

+		struct nlmsghdr n;

+		struct ifinfomsg i;

+		char buf[1024];

+	} req;

+	struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);

+	struct rtattr *tb[IFLA_MAX + 1];

+	struct rtattr *linkinfo[IFLA_INFO_MAX+1];

+	struct rtattr *greinfo[IFLA_GRE_MAX + 1];

+	__u16 iflags = 0;

+	__u16 oflags = 0;

+	unsigned ikey = 0;

+	unsigned okey = 0;

+	struct in6_addr raddr = IN6ADDR_ANY_INIT;

+	struct in6_addr laddr = IN6ADDR_ANY_INIT;

+	unsigned link = 0;

+	unsigned flowinfo = 0;

+	unsigned flags = 0;

+	__u8 hop_limit = DEFAULT_TNL_HOP_LIMIT;

+	__u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;

+	int len;

+

+	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(greinfo, IFLA_GRE_MAX,

+				    linkinfo[IFLA_INFO_DATA]);

+

+		if (greinfo[IFLA_GRE_IKEY])

+			ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]);

+

+		if (greinfo[IFLA_GRE_OKEY])

+			okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]);

+

+		if (greinfo[IFLA_GRE_IFLAGS])

+			iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]);

+

+		if (greinfo[IFLA_GRE_OFLAGS])

+			oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]);

+

+		if (greinfo[IFLA_GRE_LOCAL])

+			memcpy(&laddr, RTA_DATA(greinfo[IFLA_GRE_LOCAL]), sizeof(laddr));

+

+		if (greinfo[IFLA_GRE_REMOTE])

+			memcpy(&raddr, RTA_DATA(greinfo[IFLA_GRE_REMOTE]), sizeof(raddr));

+

+		if (greinfo[IFLA_GRE_TTL])

+			hop_limit = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);

+

+		if (greinfo[IFLA_GRE_LINK])

+			link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]);

+

+		if (greinfo[IFLA_GRE_ENCAP_LIMIT])

+			encap_limit = rta_getattr_u8(greinfo[IFLA_GRE_ENCAP_LIMIT]);

+

+		if (greinfo[IFLA_GRE_FLOWINFO])

+			flowinfo = rta_getattr_u32(greinfo[IFLA_GRE_FLOWINFO]);

+

+		if (greinfo[IFLA_GRE_FLAGS])

+			flags = rta_getattr_u32(greinfo[IFLA_GRE_FLAGS]);

+	}

+

+	while (argc > 0) {

+		if (!matches(*argv, "key")) {

+			unsigned uval;

+

+			NEXT_ARG();

+			iflags |= GRE_KEY;

+			oflags |= GRE_KEY;

+			if (strchr(*argv, '.'))

+				uval = get_addr32(*argv);

+			else {

+				if (get_unsigned(&uval, *argv, 0) < 0) {

+					fprintf(stderr,

+						"Invalid value for \"key\"\n");

+					exit(-1);

+				}

+				uval = htonl(uval);

+			}

+

+			ikey = okey = uval;

+		} else if (!matches(*argv, "ikey")) {

+			unsigned uval;

+

+			NEXT_ARG();

+			iflags |= GRE_KEY;

+			if (strchr(*argv, '.'))

+				uval = get_addr32(*argv);

+			else {

+				if (get_unsigned(&uval, *argv, 0)<0) {

+					fprintf(stderr, "invalid value of \"ikey\"\n");

+					exit(-1);

+				}

+				uval = htonl(uval);

+			}

+			ikey = uval;

+		} else if (!matches(*argv, "okey")) {

+			unsigned uval;

+

+			NEXT_ARG();

+			oflags |= GRE_KEY;

+			if (strchr(*argv, '.'))

+				uval = get_addr32(*argv);

+			else {

+				if (get_unsigned(&uval, *argv, 0)<0) {

+					fprintf(stderr, "invalid value of \"okey\"\n");

+					exit(-1);

+				}

+				uval = htonl(uval);

+			}

+			okey = uval;

+		} else if (!matches(*argv, "seq")) {

+			iflags |= GRE_SEQ;

+			oflags |= GRE_SEQ;

+		} else if (!matches(*argv, "iseq")) {

+			iflags |= GRE_SEQ;

+		} else if (!matches(*argv, "oseq")) {

+			oflags |= GRE_SEQ;

+		} else if (!matches(*argv, "csum")) {

+			iflags |= GRE_CSUM;

+			oflags |= GRE_CSUM;

+		} else if (!matches(*argv, "icsum")) {

+			iflags |= GRE_CSUM;

+		} else if (!matches(*argv, "ocsum")) {

+			oflags |= GRE_CSUM;

+		} else if (!matches(*argv, "remote")) {

+			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, sizeof(raddr));

+		} else if (!matches(*argv, "local")) {

+			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, sizeof(laddr));

+		} else if (!matches(*argv, "dev")) {

+			NEXT_ARG();

+			link = if_nametoindex(*argv);

+			if (link == 0)

+				exit(-1);

+		} else if (!matches(*argv, "ttl") ||

+			   !matches(*argv, "hoplimit")) {

+			__u8 uval;

+			NEXT_ARG();

+			if (get_u8(&uval, *argv, 0))

+				invarg("invalid TTL", *argv);

+			hop_limit = uval;

+		} else if (!matches(*argv, "tos") ||

+			   !matches(*argv, "tclass") ||

+			   !matches(*argv, "dsfield")) {

+			__u8 uval;

+			NEXT_ARG();

+			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();

+			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

+			usage();

+		argc--; argv++;

+	}

+

+	addattr32(n, 1024, IFLA_GRE_IKEY, ikey);

+	addattr32(n, 1024, IFLA_GRE_OKEY, okey);

+	addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2);

+	addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2);

+	addattr_l(n, 1024, IFLA_GRE_LOCAL, &laddr, sizeof(laddr));

+	addattr_l(n, 1024, IFLA_GRE_REMOTE, &raddr, sizeof(raddr));

+	if (link)

+		addattr32(n, 1024, IFLA_GRE_LINK, link);

+	addattr_l(n, 1024, IFLA_GRE_TTL, &hop_limit, 1);

+	addattr_l(n, 1024, IFLA_GRE_ENCAP_LIMIT, &encap_limit, 1);

+	addattr_l(n, 1024, IFLA_GRE_FLOWINFO, &flowinfo, 4);

+	addattr_l(n, 1024, IFLA_GRE_FLAGS, &flowinfo, 4);

+

+	return 0;

+}

+

+static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])

+{

+	char s1[1024];

+	char s2[64];

+	const char *local = "any";

+	const char *remote = "any";

+	unsigned iflags = 0;

+	unsigned oflags = 0;

+	unsigned flags = 0;

+	unsigned flowinfo = 0;

+	struct in6_addr in6_addr_any = IN6ADDR_ANY_INIT;

+

+	if (!tb)

+		return;

+

+	if (tb[IFLA_GRE_FLAGS])

+		flags = rta_getattr_u32(tb[IFLA_GRE_FLAGS]);

+

+	if (tb[IFLA_GRE_FLOWINFO])

+		flags = rta_getattr_u32(tb[IFLA_GRE_FLOWINFO]);