[mirror_iproute2.git] / ip / link_gre.c

/*
 * link_gre.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:	Herbert Xu <herbert@gondor.apana.org.au>
 *
 */

#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 "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#include "tunnel.h"

static void print_usage(FILE *f)
{
	fprintf(f,
		"Usage: ... { gre | gretap | erspan } [ remote ADDR ]\n"
		"                            [ local ADDR ]\n"
		"                            [ [i|o]seq ]\n"
		"                            [ [i|o]key KEY ]\n"
		"                            [ [i|o]csum ]\n"
		"                            [ ttl TTL ]\n"
		"                            [ tos TOS ]\n"
		"                            [ [no]pmtudisc ]\n"
		"                            [ [no]ignore-df ]\n"
		"                            [ dev PHYS_DEV ]\n"
		"                            [ noencap ]\n"
		"                            [ encap { fou | gue | none } ]\n"
		"                            [ encap-sport PORT ]\n"
		"                            [ encap-dport PORT ]\n"
		"                            [ [no]encap-csum ]\n"
		"                            [ [no]encap-csum6 ]\n"
		"                            [ [no]encap-remcsum ]\n"
		"                            [ external ]\n"
		"                            [ fwmark MARK ]\n"
		"                            [ erspan IDX ]\n"
		"\n"
		"Where: ADDR := { IP_ADDRESS | any }\n"
		"       TOS  := { NUMBER | inherit }\n"
		"       TTL  := { 1..255 | inherit }\n"
		"       KEY  := { DOTTED_QUAD | NUMBER }\n"
		"       MARK := { 0x0..0xffffffff }\n"
	);
}

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

static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
			 struct nlmsghdr *n)
{
	struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
	struct {
		struct nlmsghdr n;
		struct ifinfomsg i;
	} req = {
		.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
		.n.nlmsg_flags = NLM_F_REQUEST,
		.n.nlmsg_type = RTM_GETLINK,
		.i.ifi_family = preferred_family,
		.i.ifi_index = ifi->ifi_index,
	};
	struct nlmsghdr *answer;
	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;
	__be32 ikey = 0;
	__be32 okey = 0;
	unsigned int saddr = 0;
	unsigned int daddr = 0;
	unsigned int link = 0;
	__u8 pmtudisc = 1;
	__u8 ttl = 0;
	__u8 tos = 0;
	int len;
	__u16 encaptype = 0;
	__u16 encapflags = 0;
	__u16 encapsport = 0;
	__u16 encapdport = 0;
	__u8 metadata = 0;
	__u8 ignore_df = 0;
	__u32 fwmark = 0;
	__u32 erspan_idx = 0;

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

		len = answer->nlmsg_len;
		len -= NLMSG_LENGTH(sizeof(*ifi));
		if (len < 0)
			goto get_failed;

		parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), 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])
			saddr = rta_getattr_u32(greinfo[IFLA_GRE_LOCAL]);

		if (greinfo[IFLA_GRE_REMOTE])
			daddr = rta_getattr_u32(greinfo[IFLA_GRE_REMOTE]);

		if (greinfo[IFLA_GRE_PMTUDISC])
			pmtudisc = rta_getattr_u8(
				greinfo[IFLA_GRE_PMTUDISC]);

		if (greinfo[IFLA_GRE_TTL])
			ttl = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);

		if (greinfo[IFLA_GRE_TOS])
			tos = rta_getattr_u8(greinfo[IFLA_GRE_TOS]);

		if (greinfo[IFLA_GRE_LINK])
			link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]);

		if (greinfo[IFLA_GRE_ENCAP_TYPE])
			encaptype = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_TYPE]);
		if (greinfo[IFLA_GRE_ENCAP_FLAGS])
			encapflags = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_FLAGS]);
		if (greinfo[IFLA_GRE_ENCAP_SPORT])
			encapsport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_SPORT]);
		if (greinfo[IFLA_GRE_ENCAP_DPORT])
			encapdport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_DPORT]);

		if (greinfo[IFLA_GRE_COLLECT_METADATA])
			metadata = 1;

		if (greinfo[IFLA_GRE_IGNORE_DF])
			ignore_df =
				!!rta_getattr_u8(greinfo[IFLA_GRE_IGNORE_DF]);

		if (greinfo[IFLA_GRE_FWMARK])
			fwmark = rta_getattr_u32(greinfo[IFLA_GRE_FWMARK]);

		if (greinfo[IFLA_GRE_ERSPAN_INDEX])
			erspan_idx = rta_getattr_u32(greinfo[IFLA_GRE_ERSPAN_INDEX]);

		free(answer);
	}

	while (argc > 0) {
		if (!matches(*argv, "key")) {
			NEXT_ARG();
			iflags |= GRE_KEY;
			oflags |= GRE_KEY;
			ikey = okey = tnl_parse_key("key", *argv);
		} else if (!matches(*argv, "ikey")) {
			NEXT_ARG();
			iflags |= GRE_KEY;
			ikey = tnl_parse_key("ikey", *argv);
		} else if (!matches(*argv, "okey")) {
			NEXT_ARG();
			oflags |= GRE_KEY;
			okey = tnl_parse_key("okey", *argv);
		} 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, "nopmtudisc")) {
			pmtudisc = 0;
		} else if (!matches(*argv, "pmtudisc")) {
			pmtudisc = 1;
		} else if (!matches(*argv, "remote")) {
			NEXT_ARG();
			daddr = get_addr32(*argv);
		} else if (!matches(*argv, "local")) {
			NEXT_ARG();
			saddr = get_addr32(*argv);
		} else if (!matches(*argv, "dev")) {
			NEXT_ARG();
			link = if_nametoindex(*argv);
			if (link == 0) {
				fprintf(stderr, "Cannot find device \"%s\"\n",
					*argv);
				exit(-1);
			}
		} else if (!matches(*argv, "ttl") ||
			   !matches(*argv, "hoplimit")) {
			unsigned int uval;

			NEXT_ARG();
			if (strcmp(*argv, "inherit") != 0) {
				if (get_unsigned(&uval, *argv, 0))
					invarg("invalid TTL\n", *argv);
				if (uval > 255)
					invarg("TTL must be <= 255\n", *argv);
				ttl = uval;
			} else
				ttl = 0;
		} else if (!matches(*argv, "tos") ||
			   !matches(*argv, "tclass") ||
			   !matches(*argv, "dsfield")) {
			__u32 uval;

			NEXT_ARG();
			if (strcmp(*argv, "inherit") != 0) {
				if (rtnl_dsfield_a2n(&uval, *argv))
					invarg("bad TOS value", *argv);
				tos = uval;
			} else
				tos = 1;
		} else if (strcmp(*argv, "noencap") == 0) {
			encaptype = TUNNEL_ENCAP_NONE;
		} else if (strcmp(*argv, "encap") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "fou") == 0)
				encaptype = TUNNEL_ENCAP_FOU;
			else if (strcmp(*argv, "gue") == 0)
				encaptype = TUNNEL_ENCAP_GUE;
			else if (strcmp(*argv, "none") == 0)
				encaptype = TUNNEL_ENCAP_NONE;
			else
				invarg("Invalid encap type.", *argv);
		} else if (strcmp(*argv, "encap-sport") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "auto") == 0)
				encapsport = 0;
			else if (get_u16(&encapsport, *argv, 0))
				invarg("Invalid source port.", *argv);
		} else if (strcmp(*argv, "encap-dport") == 0) {
			NEXT_ARG();
			if (get_u16(&encapdport, *argv, 0))
				invarg("Invalid destination port.", *argv);
		} else if (strcmp(*argv, "encap-csum") == 0) {
			encapflags |= TUNNEL_ENCAP_FLAG_CSUM;
		} else if (strcmp(*argv, "noencap-csum") == 0) {
			encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
		} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
			encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
		} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
			encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
		} else if (strcmp(*argv, "encap-remcsum") == 0) {
			encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
		} else if (strcmp(*argv, "noencap-remcsum") == 0) {
			encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
		} else if (strcmp(*argv, "external") == 0) {
			metadata = 1;
		} else if (strcmp(*argv, "ignore-df") == 0) {
			ignore_df = 1;
		} else if (strcmp(*argv, "noignore-df") == 0) {
			/*
			 *only the lsb is significant, use 2 for presence
			 */
			ignore_df = 2;
		} else if (strcmp(*argv, "fwmark") == 0) {
			NEXT_ARG();
			if (get_u32(&fwmark, *argv, 0))
				invarg("invalid fwmark\n", *argv);
		} else if (strcmp(*argv, "erspan") == 0) {
			NEXT_ARG();
			if (get_u32(&erspan_idx, *argv, 0))
				invarg("invalid erspan index\n", *argv);
			if (erspan_idx & ~((1<<20) - 1) || erspan_idx == 0)
				invarg("erspan index must be > 0 and <= 20-bit\n", *argv);
		} else
			usage();
		argc--; argv++;
	}

	if (!ikey && IN_MULTICAST(ntohl(daddr))) {
		ikey = daddr;
		iflags |= GRE_KEY;
	}
	if (!okey && IN_MULTICAST(ntohl(daddr))) {
		okey = daddr;
		oflags |= GRE_KEY;
	}
	if (IN_MULTICAST(ntohl(daddr)) && !saddr) {
		fprintf(stderr, "A broadcast tunnel requires a source address.\n");
		return -1;
	}

	if (!metadata) {
		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, &saddr, 4);
		addattr_l(n, 1024, IFLA_GRE_REMOTE, &daddr, 4);
		addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
		if (link)
			addattr32(n, 1024, IFLA_GRE_LINK, link);
		addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
		addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1);
		addattr32(n, 1024, IFLA_GRE_FWMARK, fwmark);
		if (erspan_idx != 0)
			addattr32(n, 1024, IFLA_GRE_ERSPAN_INDEX, erspan_idx);
	} else {
		addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0);
	}

	addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
	addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
	addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
	addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));

	if (ignore_df)
		addattr8(n, 1024, IFLA_GRE_IGNORE_DF, ignore_df & 1);

	return 0;
}

static void gre_print_direct_opt(FILE *f, struct rtattr *tb[])
{
	char s2[64];
	const char *local = "any";
	const char *remote = "any";
	unsigned int iflags = 0;
	unsigned int oflags = 0;
	__u8 ttl = 0;
	__u8 tos = 0;

	if (tb[IFLA_GRE_REMOTE]) {
		unsigned int addr = rta_getattr_u32(tb[IFLA_GRE_REMOTE]);

		if (addr)
			remote = format_host(AF_INET, 4, &addr);
	}

	print_string(PRINT_ANY, "remote", "remote %s ", remote);

	if (tb[IFLA_GRE_LOCAL]) {
		unsigned int addr = rta_getattr_u32(tb[IFLA_GRE_LOCAL]);

		if (addr)
			local = format_host(AF_INET, 4, &addr);
	}

	print_string(PRINT_ANY, "local", "local %s ", local);

	if (tb[IFLA_GRE_LINK]) {
		unsigned int link = rta_getattr_u32(tb[IFLA_GRE_LINK]);

		if (link) {
			print_string(PRINT_ANY, "link", "dev %s ",
				     ll_index_to_name(link));
		}
	}

	if (tb[IFLA_GRE_TTL])
		ttl = rta_getattr_u8(tb[IFLA_GRE_TTL]);
	if (is_json_context() || ttl)
		print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
	else
		print_string(PRINT_FP, NULL, "ttl %s ", "inherit");

	if (tb[IFLA_GRE_TOS])
		tos = rta_getattr_u8(tb[IFLA_GRE_TOS]);
	if (tos) {
		if (is_json_context() || tos != 1)
			print_0xhex(PRINT_ANY, "tos", "tos 0x%x ", tos);
		else
			print_string(PRINT_FP, NULL, "tos %s ", "inherit");
	}

	if (tb[IFLA_GRE_PMTUDISC]) {
		if (!rta_getattr_u8(tb[IFLA_GRE_PMTUDISC]))
			print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
		else
			print_bool(PRINT_JSON, "pmtudisc", NULL, true);
	}

	if (tb[IFLA_GRE_IFLAGS])
		iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]);

	if (tb[IFLA_GRE_OFLAGS])
		oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]);

	if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) {
		inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
		print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
	}

	if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) {
		inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
		print_string(PRINT_ANY, "okey", "okey %s ", s2);
	}

	if (iflags & GRE_SEQ)
		print_bool(PRINT_ANY, "iseq", "iseq ", true);
	if (oflags & GRE_SEQ)
		print_bool(PRINT_ANY, "oseq", "oseq ", true);
	if (iflags & GRE_CSUM)
		print_bool(PRINT_ANY, "icsum", "icsum ", true);
	if (oflags & GRE_CSUM)
		print_bool(PRINT_ANY, "ocsum", "ocsum ", true);

	if (tb[IFLA_GRE_FWMARK]) {
		__u32 fwmark = rta_getattr_u32(tb[IFLA_GRE_FWMARK]);

		if (fwmark) {
			print_0xhex(PRINT_ANY,
				    "fwmark", "fwmark 0x%x ", fwmark);
		}
	}
}

static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
	if (!tb)
		return;

	if (!tb[IFLA_GRE_COLLECT_METADATA])
		gre_print_direct_opt(f, tb);
	else
		print_bool(PRINT_ANY, "external", "external ", true);

	if (tb[IFLA_GRE_IGNORE_DF] && rta_getattr_u8(tb[IFLA_GRE_IGNORE_DF]))
		print_bool(PRINT_ANY, "ignore_df", "ignore-df ", true);

	if (tb[IFLA_GRE_ERSPAN_INDEX]) {
		__u32 erspan_idx = rta_getattr_u32(tb[IFLA_GRE_ERSPAN_INDEX]);

		print_uint(PRINT_ANY,
			   "erspan_index", "erspan_index %u ", erspan_idx);
	}

	tnl_print_encap(tb,
			IFLA_GRE_ENCAP_TYPE,
			IFLA_GRE_ENCAP_FLAGS,
			IFLA_GRE_ENCAP_SPORT,
			IFLA_GRE_ENCAP_DPORT);
}

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

struct link_util gre_link_util = {
	.id = "gre",
	.maxattr = IFLA_GRE_MAX,
	.parse_opt = gre_parse_opt,
	.print_opt = gre_print_opt,
	.print_help = gre_print_help,
};

struct link_util gretap_link_util = {
	.id = "gretap",
	.maxattr = IFLA_GRE_MAX,
	.parse_opt = gre_parse_opt,
	.print_opt = gre_print_opt,
	.print_help = gre_print_help,
};

struct link_util erspan_link_util = {
	.id = "erspan",
	.maxattr = IFLA_GRE_MAX,
	.parse_opt = gre_parse_opt,
	.print_opt = gre_print_opt,
	.print_help = gre_print_help,
};
Commit	Line	Data
237d9e82 HX	1	/*
	2	* link_gre.c gre driver module
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Herbert Xu <herbert@gondor.apana.org.au>
	10	*
	11	*/
	12
	13	#include <string.h>
	14	#include <net/if.h>
237d9e82 HX	15	#include <sys/types.h>
	16	#include <sys/socket.h>
	17	#include <arpa/inet.h>
	18
1957a322 SH	19	#include <linux/ip.h>
1957a322 SH	20	#include <linux/if_tunnel.h>
237d9e82 HX	21	#include "rt_names.h"
	22	#include "utils.h"
	23	#include "ip_common.h"
	24	#include "tunnel.h"
	25
561e650e	26	static void print_usage(FILE *f)
561e650e	27	{
8b471354	28	fprintf(f,
9a1381d5	29	"Usage: ... { gre \| gretap \| erspan } [ remote ADDR ]\n"
8b471354 PS	30	" [ local ADDR ]\n"
	31	" [ [i\|o]seq ]\n"
	32	" [ [i\|o]key KEY ]\n"
	33	" [ [i\|o]csum ]\n"
	34	" [ ttl TTL ]\n"
	35	" [ tos TOS ]\n"
	36	" [ [no]pmtudisc ]\n"
adbb2965	37	" [ [no]ignore-df ]\n"
8b471354 PS	38	" [ dev PHYS_DEV ]\n"
	39	" [ noencap ]\n"
	40	" [ encap { fou \| gue \| none } ]\n"
	41	" [ encap-sport PORT ]\n"
	42	" [ encap-dport PORT ]\n"
	43	" [ [no]encap-csum ]\n"
	44	" [ [no]encap-csum6 ]\n"
	45	" [ [no]encap-remcsum ]\n"
b760a882	46	" [ external ]\n"
ad4b1425	47	" [ fwmark MARK ]\n"
9a1381d5	48	" [ erspan IDX ]\n"
8b471354 PS	49	"\n"
	50	"Where: ADDR := { IP_ADDRESS \| any }\n"
	51	" TOS := { NUMBER \| inherit }\n"
	52	" TTL := { 1..255 \| inherit }\n"
	53	" KEY := { DOTTED_QUAD \| NUMBER }\n"
ad4b1425	54	" MARK := { 0x0..0xffffffff }\n"
8b471354	55	);
561e650e	56	}
561e650e	57
237d9e82 HX	58	static void usage(void) __attribute__((noreturn));
	59	static void usage(void)
	60	{
561e650e	61	print_usage(stderr);
237d9e82 HX	62	exit(-1);
	63	}
	64
	65	static int gre_parse_opt(struct link_util lu, int argc, char *argv,
	66	struct nlmsghdr *n)
	67	{
d17b136f	68	struct ifinfomsg ifi = (struct ifinfomsg )(n + 1);
72c771b2 HX	69	struct {
	70	struct nlmsghdr n;
	71	struct ifinfomsg i;
d17b136f PS	72	} req = {
	73	.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
	74	.n.nlmsg_flags = NLM_F_REQUEST,
	75	.n.nlmsg_type = RTM_GETLINK,
	76	.i.ifi_family = preferred_family,
	77	.i.ifi_index = ifi->ifi_index,
	78	};
08ede25f	79	struct nlmsghdr *answer;
72c771b2 HX	80	struct rtattr *tb[IFLA_MAX + 1];
	81	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
	82	struct rtattr *greinfo[IFLA_GRE_MAX + 1];
237d9e82 HX	83	__u16 iflags = 0;
237d9e82 HX	84	__u16 oflags = 0;
1f44b937 SP	85	__be32 ikey = 0;
1f44b937 SP	86	__be32 okey = 0;
56f5daac SH	87	unsigned int saddr = 0;
	88	unsigned int daddr = 0;
	89	unsigned int link = 0;
72c771b2 HX	90	__u8 pmtudisc = 1;
	91	__u8 ttl = 0;
	92	__u8 tos = 0;
	93	int len;
80c24b09 TH	94	__u16 encaptype = 0;
	95	__u16 encapflags = 0;
	96	__u16 encapsport = 0;
	97	__u16 encapdport = 0;
926b39e1	98	__u8 metadata = 0;
adbb2965	99	__u8 ignore_df = 0;
ad4b1425	100	__u32 fwmark = 0;
9a1381d5	101	__u32 erspan_idx = 0;
72c771b2 HX	102
72c771b2 HX	103	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
86bf43c7	104	if (rtnl_talk(&rth, &req.n, &answer) < 0) {
72c771b2 HX	105	get_failed:
	106	fprintf(stderr,
	107	"Failed to get existing tunnel info.\n");
	108	return -1;
	109	}
	110
86bf43c7	111	len = answer->nlmsg_len;
72c771b2 HX	112	len -= NLMSG_LENGTH(sizeof(*ifi));
	113	if (len < 0)
	114	goto get_failed;
	115
86bf43c7	116	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
72c771b2 HX	117
	118	if (!tb[IFLA_LINKINFO])
	119	goto get_failed;
	120
	121	parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
	122
	123	if (!linkinfo[IFLA_INFO_DATA])
	124	goto get_failed;
	125
	126	parse_rtattr_nested(greinfo, IFLA_GRE_MAX,
	127	linkinfo[IFLA_INFO_DATA]);
	128
	129	if (greinfo[IFLA_GRE_IKEY])
ff24746c	130	ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]);
72c771b2 HX	131
72c771b2 HX	132	if (greinfo[IFLA_GRE_OKEY])
ff24746c	133	okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]);
72c771b2 HX	134
72c771b2 HX	135	if (greinfo[IFLA_GRE_IFLAGS])
ff24746c	136	iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]);
72c771b2 HX	137
72c771b2 HX	138	if (greinfo[IFLA_GRE_OFLAGS])
ff24746c	139	oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]);
72c771b2 HX	140
72c771b2 HX	141	if (greinfo[IFLA_GRE_LOCAL])
ff24746c	142	saddr = rta_getattr_u32(greinfo[IFLA_GRE_LOCAL]);
72c771b2 HX	143
72c771b2 HX	144	if (greinfo[IFLA_GRE_REMOTE])
ff24746c	145	daddr = rta_getattr_u32(greinfo[IFLA_GRE_REMOTE]);
72c771b2 HX	146
72c771b2 HX	147	if (greinfo[IFLA_GRE_PMTUDISC])
ff24746c	148	pmtudisc = rta_getattr_u8(
72c771b2 HX	149	greinfo[IFLA_GRE_PMTUDISC]);
	150
	151	if (greinfo[IFLA_GRE_TTL])
ff24746c	152	ttl = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);
72c771b2 HX	153
72c771b2 HX	154	if (greinfo[IFLA_GRE_TOS])
ff24746c	155	tos = rta_getattr_u8(greinfo[IFLA_GRE_TOS]);
72c771b2 HX	156
72c771b2 HX	157	if (greinfo[IFLA_GRE_LINK])
a6addd5c	158	link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]);
80c24b09 TH	159
	160	if (greinfo[IFLA_GRE_ENCAP_TYPE])
	161	encaptype = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_TYPE]);
	162	if (greinfo[IFLA_GRE_ENCAP_FLAGS])
	163	encapflags = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_FLAGS]);
	164	if (greinfo[IFLA_GRE_ENCAP_SPORT])
	165	encapsport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_SPORT]);
	166	if (greinfo[IFLA_GRE_ENCAP_DPORT])
	167	encapdport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_DPORT]);
926b39e1 PA	168
	169	if (greinfo[IFLA_GRE_COLLECT_METADATA])
	170	metadata = 1;
ad4b1425	171
adbb2965 PP	172	if (greinfo[IFLA_GRE_IGNORE_DF])
	173	ignore_df =
	174	!!rta_getattr_u8(greinfo[IFLA_GRE_IGNORE_DF]);
	175
ad4b1425 CG	176	if (greinfo[IFLA_GRE_FWMARK])
ad4b1425 CG	177	fwmark = rta_getattr_u32(greinfo[IFLA_GRE_FWMARK]);
9a1381d5 WT	178
	179	if (greinfo[IFLA_GRE_ERSPAN_INDEX])
	180	erspan_idx = rta_getattr_u32(greinfo[IFLA_GRE_ERSPAN_INDEX]);
86bf43c7 HL	181
86bf43c7 HL	182	free(answer);
72c771b2	183	}
237d9e82 HX	184
	185	while (argc > 0) {
	186	if (!matches(*argv, "key")) {
237d9e82 HX	187	NEXT_ARG();
	188	iflags \|= GRE_KEY;
	189	oflags \|= GRE_KEY;
1f44b937	190	ikey = okey = tnl_parse_key("key", *argv);
237d9e82	191	} else if (!matches(*argv, "ikey")) {
237d9e82 HX	192	NEXT_ARG();
237d9e82 HX	193	iflags \|= GRE_KEY;
1f44b937	194	ikey = tnl_parse_key("ikey", *argv);
237d9e82	195	} else if (!matches(*argv, "okey")) {
237d9e82 HX	196	NEXT_ARG();
237d9e82 HX	197	oflags \|= GRE_KEY;
1f44b937	198	okey = tnl_parse_key("okey", *argv);
237d9e82 HX	199	} else if (!matches(*argv, "seq")) {
	200	iflags \|= GRE_SEQ;
	201	oflags \|= GRE_SEQ;
	202	} else if (!matches(*argv, "iseq")) {
	203	iflags \|= GRE_SEQ;
	204	} else if (!matches(*argv, "oseq")) {
	205	oflags \|= GRE_SEQ;
	206	} else if (!matches(*argv, "csum")) {
	207	iflags \|= GRE_CSUM;
	208	oflags \|= GRE_CSUM;
	209	} else if (!matches(*argv, "icsum")) {
	210	iflags \|= GRE_CSUM;
	211	} else if (!matches(*argv, "ocsum")) {
	212	oflags \|= GRE_CSUM;
	213	} else if (!matches(*argv, "nopmtudisc")) {
72c771b2	214	pmtudisc = 0;
237d9e82	215	} else if (!matches(*argv, "pmtudisc")) {
72c771b2	216	pmtudisc = 1;
237d9e82 HX	217	} else if (!matches(*argv, "remote")) {
237d9e82 HX	218	NEXT_ARG();
57daab1e	219	daddr = get_addr32(*argv);
237d9e82 HX	220	} else if (!matches(*argv, "local")) {
237d9e82 HX	221	NEXT_ARG();
57daab1e	222	saddr = get_addr32(*argv);
237d9e82	223	} else if (!matches(*argv, "dev")) {
237d9e82	224	NEXT_ARG();
ea71beac	225	link = if_nametoindex(*argv);
0cb6bb51 CW	226	if (link == 0) {
	227	fprintf(stderr, "Cannot find device \"%s\"\n",
	228	*argv);
237d9e82	229	exit(-1);
0cb6bb51	230	}
237d9e82 HX	231	} else if (!matches(*argv, "ttl") \|\|
237d9e82 HX	232	!matches(*argv, "hoplimit")) {
56f5daac	233	unsigned int uval;
237d9e82 HX	234
	235	NEXT_ARG();
	236	if (strcmp(*argv, "inherit") != 0) {
	237	if (get_unsigned(&uval, *argv, 0))
	238	invarg("invalid TTL\n", *argv);
	239	if (uval > 255)
	240	invarg("TTL must be <= 255\n", *argv);
	241	ttl = uval;
079e6781 RS	242	} else
079e6781 RS	243	ttl = 0;
237d9e82 HX	244	} else if (!matches(*argv, "tos") \|\|
	245	!matches(*argv, "tclass") \|\|
	246	!matches(*argv, "dsfield")) {
	247	__u32 uval;
237d9e82 HX	248
	249	NEXT_ARG();
	250	if (strcmp(*argv, "inherit") != 0) {
	251	if (rtnl_dsfield_a2n(&uval, *argv))
	252	invarg("bad TOS value", *argv);
	253	tos = uval;
	254	} else
	255	tos = 1;
80c24b09 TH	256	} else if (strcmp(*argv, "noencap") == 0) {
	257	encaptype = TUNNEL_ENCAP_NONE;
	258	} else if (strcmp(*argv, "encap") == 0) {
	259	NEXT_ARG();
	260	if (strcmp(*argv, "fou") == 0)
	261	encaptype = TUNNEL_ENCAP_FOU;
	262	else if (strcmp(*argv, "gue") == 0)
	263	encaptype = TUNNEL_ENCAP_GUE;
	264	else if (strcmp(*argv, "none") == 0)
	265	encaptype = TUNNEL_ENCAP_NONE;
	266	else
	267	invarg("Invalid encap type.", *argv);
	268	} else if (strcmp(*argv, "encap-sport") == 0) {
	269	NEXT_ARG();
	270	if (strcmp(*argv, "auto") == 0)
	271	encapsport = 0;
	272	else if (get_u16(&encapsport, *argv, 0))
	273	invarg("Invalid source port.", *argv);
	274	} else if (strcmp(*argv, "encap-dport") == 0) {
	275	NEXT_ARG();
	276	if (get_u16(&encapdport, *argv, 0))
	277	invarg("Invalid destination port.", *argv);
	278	} else if (strcmp(*argv, "encap-csum") == 0) {
	279	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM;
	280	} else if (strcmp(*argv, "noencap-csum") == 0) {
	281	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
	282	} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
	283	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM6;
	284	} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
147ade01	285	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
858dbb20 TH	286	} else if (strcmp(*argv, "encap-remcsum") == 0) {
	287	encapflags \|= TUNNEL_ENCAP_FLAG_REMCSUM;
	288	} else if (strcmp(*argv, "noencap-remcsum") == 0) {
147ade01	289	encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
926b39e1 PA	290	} else if (strcmp(*argv, "external") == 0) {
926b39e1 PA	291	metadata = 1;
adbb2965 PP	292	} else if (strcmp(*argv, "ignore-df") == 0) {
	293	ignore_df = 1;
	294	} else if (strcmp(*argv, "noignore-df") == 0) {
	295	/*
	296	*only the lsb is significant, use 2 for presence
	297	*/
	298	ignore_df = 2;
ad4b1425 CG	299	} else if (strcmp(*argv, "fwmark") == 0) {
	300	NEXT_ARG();
	301	if (get_u32(&fwmark, *argv, 0))
	302	invarg("invalid fwmark\n", *argv);
9a1381d5 WT	303	} else if (strcmp(*argv, "erspan") == 0) {
	304	NEXT_ARG();
	305	if (get_u32(&erspan_idx, *argv, 0))
	306	invarg("invalid erspan index\n", *argv);
	307	if (erspan_idx & ~((1<<20) - 1) \|\| erspan_idx == 0)
	308	invarg("erspan index must be > 0 and <= 20-bit\n", *argv);
0612519e	309	} else
237d9e82 HX	310	usage();
	311	argc--; argv++;
	312	}
	313
	314	if (!ikey && IN_MULTICAST(ntohl(daddr))) {
	315	ikey = daddr;
	316	iflags \|= GRE_KEY;
	317	}
	318	if (!okey && IN_MULTICAST(ntohl(daddr))) {
	319	okey = daddr;
	320	oflags \|= GRE_KEY;
	321	}
	322	if (IN_MULTICAST(ntohl(daddr)) && !saddr) {
14645ec2	323	fprintf(stderr, "A broadcast tunnel requires a source address.\n");
237d9e82 HX	324	return -1;
	325	}
	326
df217d5d JB	327	if (!metadata) {
	328	addattr32(n, 1024, IFLA_GRE_IKEY, ikey);
	329	addattr32(n, 1024, IFLA_GRE_OKEY, okey);
	330	addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2);
	331	addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2);
	332	addattr_l(n, 1024, IFLA_GRE_LOCAL, &saddr, 4);
	333	addattr_l(n, 1024, IFLA_GRE_REMOTE, &daddr, 4);
	334	addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
	335	if (link)
	336	addattr32(n, 1024, IFLA_GRE_LINK, link);
	337	addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
	338	addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1);
ad4b1425	339	addattr32(n, 1024, IFLA_GRE_FWMARK, fwmark);
9a1381d5 WT	340	if (erspan_idx != 0)
9a1381d5 WT	341	addattr32(n, 1024, IFLA_GRE_ERSPAN_INDEX, erspan_idx);
df217d5d JB	342	} else {
	343	addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0);
	344	}
237d9e82	345
80c24b09 TH	346	addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
	347	addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
	348	addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
	349	addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));
	350
adbb2965 PP	351	if (ignore_df)
	352	addattr8(n, 1024, IFLA_GRE_IGNORE_DF, ignore_df & 1);
	353
237d9e82 HX	354	return 0;
	355	}
	356
7c337e2c	357	static void gre_print_direct_opt(FILE f, struct rtattr tb[])
237d9e82	358	{
237d9e82 HX	359	char s2[64];
	360	const char *local = "any";
	361	const char *remote = "any";
56f5daac SH	362	unsigned int iflags = 0;
56f5daac SH	363	unsigned int oflags = 0;
375560c4	364	__u8 ttl = 0;
3caa526c	365	__u8 tos = 0;
237d9e82	366
237d9e82	367	if (tb[IFLA_GRE_REMOTE]) {
56f5daac	368	unsigned int addr = rta_getattr_u32(tb[IFLA_GRE_REMOTE]);
237d9e82 HX	369
237d9e82 HX	370	if (addr)
a418e451	371	remote = format_host(AF_INET, 4, &addr);
237d9e82 HX	372	}
237d9e82 HX	373
e2d45883	374	print_string(PRINT_ANY, "remote", "remote %s ", remote);
237d9e82 HX	375
237d9e82 HX	376	if (tb[IFLA_GRE_LOCAL]) {
56f5daac	377	unsigned int addr = rta_getattr_u32(tb[IFLA_GRE_LOCAL]);
237d9e82 HX	378
237d9e82 HX	379	if (addr)
a418e451	380	local = format_host(AF_INET, 4, &addr);
237d9e82 HX	381	}
237d9e82 HX	382
e2d45883	383	print_string(PRINT_ANY, "local", "local %s ", local);
237d9e82	384
45d3a6ef	385	if (tb[IFLA_GRE_LINK]) {
56f5daac	386	unsigned int link = rta_getattr_u32(tb[IFLA_GRE_LINK]);
237d9e82	387
45d3a6ef SP	388	if (link) {
	389	print_string(PRINT_ANY, "link", "dev %s ",
	390	ll_index_to_name(link));
	391	}
237d9e82 HX	392	}
237d9e82 HX	393
375560c4 SP	394	if (tb[IFLA_GRE_TTL])
	395	ttl = rta_getattr_u8(tb[IFLA_GRE_TTL]);
	396	if (is_json_context() \|\| ttl)
	397	print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
	398	else
e2d45883	399	print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
237d9e82	400
3caa526c SP	401	if (tb[IFLA_GRE_TOS])
	402	tos = rta_getattr_u8(tb[IFLA_GRE_TOS]);
	403	if (tos) {
	404	if (is_json_context() \|\| tos != 1)
	405	print_0xhex(PRINT_ANY, "tos", "tos 0x%x ", tos);
	406	else
	407	print_string(PRINT_FP, NULL, "tos %s ", "inherit");
237d9e82 HX	408	}
237d9e82 HX	409
e2d45883 JF	410	if (tb[IFLA_GRE_PMTUDISC]) {
	411	if (!rta_getattr_u8(tb[IFLA_GRE_PMTUDISC]))
	412	print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
	413	else
	414	print_bool(PRINT_JSON, "pmtudisc", NULL, true);
	415	}
237d9e82 HX	416
237d9e82 HX	417	if (tb[IFLA_GRE_IFLAGS])
ff24746c	418	iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]);
237d9e82 HX	419
237d9e82 HX	420	if (tb[IFLA_GRE_OFLAGS])
ff24746c	421	oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]);
237d9e82	422
71816553	423	if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) {
237d9e82	424	inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
e2d45883	425	print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
237d9e82 HX	426	}
237d9e82 HX	427
71816553	428	if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) {
237d9e82	429	inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
e2d45883	430	print_string(PRINT_ANY, "okey", "okey %s ", s2);
237d9e82 HX	431	}
	432
	433	if (iflags & GRE_SEQ)
e2d45883	434	print_bool(PRINT_ANY, "iseq", "iseq ", true);
237d9e82	435	if (oflags & GRE_SEQ)
e2d45883	436	print_bool(PRINT_ANY, "oseq", "oseq ", true);
237d9e82	437	if (iflags & GRE_CSUM)
e2d45883	438	print_bool(PRINT_ANY, "icsum", "icsum ", true);
237d9e82	439	if (oflags & GRE_CSUM)
e2d45883 JF	440	print_bool(PRINT_ANY, "ocsum", "ocsum ", true);
	441
	442	if (tb[IFLA_GRE_FWMARK]) {
	443	__u32 fwmark = rta_getattr_u32(tb[IFLA_GRE_FWMARK]);
	444
	445	if (fwmark) {
e97ad3d2 SP	446	print_0xhex(PRINT_ANY,
e97ad3d2 SP	447	"fwmark", "fwmark 0x%x ", fwmark);
e2d45883	448	}
ad4b1425	449	}
7c337e2c	450	}
80c24b09	451
7c337e2c JB	452	static void gre_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	453	{
	454	if (!tb)
	455	return;
	456
	457	if (!tb[IFLA_GRE_COLLECT_METADATA])
	458	gre_print_direct_opt(f, tb);
	459	else
e2d45883	460	print_bool(PRINT_ANY, "external", "external ", true);
926b39e1	461
adbb2965	462	if (tb[IFLA_GRE_IGNORE_DF] && rta_getattr_u8(tb[IFLA_GRE_IGNORE_DF]))
e2d45883	463	print_bool(PRINT_ANY, "ignore_df", "ignore-df ", true);
adbb2965	464
9a1381d5 WT	465	if (tb[IFLA_GRE_ERSPAN_INDEX]) {
	466	__u32 erspan_idx = rta_getattr_u32(tb[IFLA_GRE_ERSPAN_INDEX]);
	467
2a8d0f6e SP	468	print_uint(PRINT_ANY,
2a8d0f6e SP	469	"erspan_index", "erspan_index %u ", erspan_idx);
9a1381d5 WT	470	}
9a1381d5 WT	471
bad76e6b SP	472	tnl_print_encap(tb,
	473	IFLA_GRE_ENCAP_TYPE,
	474	IFLA_GRE_ENCAP_FLAGS,
	475	IFLA_GRE_ENCAP_SPORT,
	476	IFLA_GRE_ENCAP_DPORT);
237d9e82 HX	477	}
237d9e82 HX	478
561e650e	479	static void gre_print_help(struct link_util lu, int argc, char *argv,
e2d45883	480	FILE *f)
561e650e	481	{
	482	print_usage(f);
	483	}
	484
237d9e82 HX	485	struct link_util gre_link_util = {
	486	.id = "gre",
	487	.maxattr = IFLA_GRE_MAX,
	488	.parse_opt = gre_parse_opt,
	489	.print_opt = gre_print_opt,
561e650e	490	.print_help = gre_print_help,
237d9e82 HX	491	};
	492
	493	struct link_util gretap_link_util = {
	494	.id = "gretap",
	495	.maxattr = IFLA_GRE_MAX,
	496	.parse_opt = gre_parse_opt,
	497	.print_opt = gre_print_opt,
561e650e	498	.print_help = gre_print_help,
237d9e82	499	};
9a1381d5 WT	500
	501	struct link_util erspan_link_util = {
	502	.id = "erspan",
	503	.maxattr = IFLA_GRE_MAX,
	504	.parse_opt = gre_parse_opt,
	505	.print_opt = gre_print_opt,
	506	.print_help = gre_print_help,
	507	};