Blame ip/link_ip6tnl.c

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/*
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 * link_ip6tnl.c	ip6tnl driver module
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 *
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 *		This program is free software; you can redistribute it and/or
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 *		modify it under the terms of the GNU General Public License
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 *		as published by the Free Software Foundation; either version
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 *		2 of the License, or (at your option) any later version.
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 *
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 * Authors:	Nicolas Dichtel <nicolas.dichtel@6wind.com>
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 *
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 */
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#include <string.h>
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#include <net/if.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <linux/ip.h>
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#include <linux/if_tunnel.h>
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#include <linux/ip6_tunnel.h>
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#include "rt_names.h"
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#include "utils.h"
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#include "ip_common.h"
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#include "tunnel.h"
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#define IP6_FLOWINFO_TCLASS	htonl(0x0FF00000)
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#define IP6_FLOWINFO_FLOWLABEL	htonl(0x000FFFFF)
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#define DEFAULT_TNL_HOP_LIMIT	(64)
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static void ip6tunnel_print_help(struct link_util *lu, int argc, char **argv,
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				 FILE *f)
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{
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	fprintf(f,
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		"Usage: ... %-6s	[ remote ADDR ]\n"
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		"			[ local ADDR ]\n"
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		"			[ encaplimit ELIM ]\n"
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		"			[ hoplimit HLIM ]\n"
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		"			[ tclass TCLASS ]\n"
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		"			[ flowlabel FLOWLABEL ]\n"
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		"			[ dscp inherit ]\n"
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		"			[ [no]allow-localremote ]\n"
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		"			[ dev PHYS_DEV ]\n"
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		"			[ fwmark MARK ]\n"
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		"			[ external ]\n"
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		"			[ noencap ]\n"
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		"			[ encap { fou | gue | none } ]\n"
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		"			[ encap-sport PORT ]\n"
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		"			[ encap-dport PORT ]\n"
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		"			[ [no]encap-csum ]\n"
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		"			[ [no]encap-csum6 ]\n"
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		"			[ [no]encap-remcsum ]\n"
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		"			[ mode { ip6ip6 | ipip6 | any } ]\n"
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		"\n"
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		"Where:	ADDR	  := IPV6_ADDRESS\n"
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		"	ELIM	  := { none | 0..255 }(default=%d)\n"
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		"	HLIM	  := 0..255 (default=%d)\n"
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		"	TCLASS    := { 0x0..0xff | inherit }\n"
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		"	FLOWLABEL := { 0x0..0xfffff | inherit }\n"
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		"	MARK	  := { 0x0..0xffffffff | inherit }\n",
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		lu->id,
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		IPV6_DEFAULT_TNL_ENCAP_LIMIT, DEFAULT_TNL_HOP_LIMIT);
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}
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static int ip6tunnel_parse_opt(struct link_util *lu, int argc, char **argv,
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			       struct nlmsghdr *n)
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{
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	struct ifinfomsg *ifi = NLMSG_DATA(n);
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	struct {
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		struct nlmsghdr n;
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		struct ifinfomsg i;
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	} req = {
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		.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
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		.n.nlmsg_flags = NLM_F_REQUEST,
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		.n.nlmsg_type = RTM_GETLINK,
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		.i.ifi_family = preferred_family,
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		.i.ifi_index = ifi->ifi_index,
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	};
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	struct nlmsghdr *answer;
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	struct rtattr *tb[IFLA_MAX + 1];
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	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
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	struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
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	int len;
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	inet_prefix saddr, daddr;
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	__u8 hop_limit = DEFAULT_TNL_HOP_LIMIT;
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	__u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
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	__u32 flowinfo = 0;
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	__u32 flags = 0;
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	__u8 proto = 0;
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	__u32 link = 0;
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	__u16 encaptype = 0;
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	__u16 encapflags = TUNNEL_ENCAP_FLAG_CSUM6;
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	__u16 encapsport = 0;
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	__u16 encapdport = 0;
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	__u8 metadata = 0;
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	__u32 fwmark = 0;
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	inet_prefix_reset(&saddr);
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	inet_prefix_reset(&daddr);
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	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
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		const struct rtattr *rta;
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		if (rtnl_talk(&rth, &req.n, &answer) < 0) {
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get_failed:
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			fprintf(stderr,
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				"Failed to get existing tunnel info.\n");
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			return -1;
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		}
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		len = answer->nlmsg_len;
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		len -= NLMSG_LENGTH(sizeof(*ifi));
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		if (len < 0)
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			goto get_failed;
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		parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
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		if (!tb[IFLA_LINKINFO])
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			goto get_failed;
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		parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
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		if (!linkinfo[IFLA_INFO_DATA])
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			goto get_failed;
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		parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
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				    linkinfo[IFLA_INFO_DATA]);
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		rta = iptuninfo[IFLA_IPTUN_LOCAL];
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		if (rta && get_addr_rta(&saddr, rta, AF_INET6))
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			goto get_failed;
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		rta = iptuninfo[IFLA_IPTUN_REMOTE];
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		if (rta && get_addr_rta(&daddr, rta, AF_INET6))
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			goto get_failed;
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		if (iptuninfo[IFLA_IPTUN_TTL])
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			hop_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
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		if (iptuninfo[IFLA_IPTUN_ENCAP_LIMIT])
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			encap_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]);
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		if (iptuninfo[IFLA_IPTUN_FLOWINFO])
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			flowinfo = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLOWINFO]);
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		if (iptuninfo[IFLA_IPTUN_FLAGS])
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			flags = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLAGS]);
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		if (iptuninfo[IFLA_IPTUN_LINK])
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			link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
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		if (iptuninfo[IFLA_IPTUN_PROTO])
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			proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
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		if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA])
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			metadata = 1;
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		if (iptuninfo[IFLA_IPTUN_FWMARK])
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			fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]);
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		free(answer);
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	}
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	while (argc > 0) {
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		if (strcmp(*argv, "mode") == 0) {
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			NEXT_ARG();
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			if (strcmp(*argv, "ipv6/ipv6") == 0 ||
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			    strcmp(*argv, "ip6ip6") == 0)
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				proto = IPPROTO_IPV6;
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			else if (strcmp(*argv, "ip/ipv6") == 0 ||
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				 strcmp(*argv, "ipv4/ipv6") == 0 ||
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				 strcmp(*argv, "ipip6") == 0 ||
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				 strcmp(*argv, "ip4ip6") == 0)
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				proto = IPPROTO_IPIP;
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			else if (strcmp(*argv, "any/ipv6") == 0 ||
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				 strcmp(*argv, "any") == 0)
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				proto = 0;
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			else
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				invarg("Cannot guess tunnel mode.", *argv);
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		} else if (strcmp(*argv, "remote") == 0) {
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			NEXT_ARG();
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			get_addr(&daddr, *argv, AF_INET6);
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		} else if (strcmp(*argv, "local") == 0) {
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			NEXT_ARG();
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			get_addr(&saddr, *argv, AF_INET6);
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		} else if (matches(*argv, "dev") == 0) {
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			NEXT_ARG();
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			link = ll_name_to_index(*argv);
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			if (!link)
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				exit(nodev(*argv));
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		} else if (strcmp(*argv, "ttl") == 0 ||
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			   strcmp(*argv, "hoplimit") == 0 ||
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			   strcmp(*argv, "hlim") == 0) {
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			NEXT_ARG();
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			if (strcmp(*argv, "inherit") != 0) {
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				if (get_u8(&hop_limit, *argv, 0))
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					invarg("invalid HLIM\n", *argv);
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			} else
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				hop_limit = 0;
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		} else if (strcmp(*argv, "encaplimit") == 0) {
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			NEXT_ARG();
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			if (strcmp(*argv, "none") == 0) {
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				flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
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			} else {
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				__u8 uval;
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				if (get_u8(&uval, *argv, 0) < -1)
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					invarg("invalid ELIM", *argv);
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				encap_limit = uval;
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				flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
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			}
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		} else if (strcmp(*argv, "tos") == 0 ||
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			   strcmp(*argv, "tclass") == 0 ||
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			   strcmp(*argv, "tc") == 0 ||
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			   matches(*argv, "dsfield") == 0) {
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			__u8 uval;
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			NEXT_ARG();
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			flowinfo &= ~IP6_FLOWINFO_TCLASS;
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			if (strcmp(*argv, "inherit") == 0)
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				flags |= IP6_TNL_F_USE_ORIG_TCLASS;
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			else {
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				if (get_u8(&uval, *argv, 16))
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					invarg("invalid TClass", *argv);
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				flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
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				flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
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			}
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		} else if (strcmp(*argv, "flowlabel") == 0 ||
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			   strcmp(*argv, "fl") == 0) {
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			__u32 uval;
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			NEXT_ARG();
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			flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
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			if (strcmp(*argv, "inherit") == 0)
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				flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
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			else {
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				if (get_u32(&uval, *argv, 16))
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					invarg("invalid Flowlabel", *argv);
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				if (uval > 0xFFFFF)
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					invarg("invalid Flowlabel", *argv);
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				flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
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				flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
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			}
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		} else if (strcmp(*argv, "dscp") == 0) {
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			NEXT_ARG();
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			if (strcmp(*argv, "inherit") != 0)
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				invarg("not inherit", *argv);
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			flags |= IP6_TNL_F_RCV_DSCP_COPY;
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		} else if (strcmp(*argv, "fwmark") == 0) {
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			NEXT_ARG();
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			if (strcmp(*argv, "inherit") == 0) {
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				flags |= IP6_TNL_F_USE_ORIG_FWMARK;
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				fwmark = 0;
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			} else {
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				if (get_u32(&fwmark, *argv, 0))
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					invarg("invalid fwmark\n", *argv);
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				flags &= ~IP6_TNL_F_USE_ORIG_FWMARK;
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			}
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		} else if (strcmp(*argv, "allow-localremote") == 0) {
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			flags |= IP6_TNL_F_ALLOW_LOCAL_REMOTE;
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		} else if (strcmp(*argv, "noallow-localremote") == 0) {
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			flags &= ~IP6_TNL_F_ALLOW_LOCAL_REMOTE;
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		} else if (strcmp(*argv, "noencap") == 0) {
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			encaptype = TUNNEL_ENCAP_NONE;
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		} else if (strcmp(*argv, "encap") == 0) {
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			NEXT_ARG();
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			if (strcmp(*argv, "fou") == 0)
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				encaptype = TUNNEL_ENCAP_FOU;
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			else if (strcmp(*argv, "gue") == 0)
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				encaptype = TUNNEL_ENCAP_GUE;
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			else if (strcmp(*argv, "none") == 0)
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				encaptype = TUNNEL_ENCAP_NONE;
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			else
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				invarg("Invalid encap type.", *argv);
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		} else if (strcmp(*argv, "encap-sport") == 0) {
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			NEXT_ARG();
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			if (strcmp(*argv, "auto") == 0)
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				encapsport = 0;
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			else if (get_u16(&encapsport, *argv, 0))
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				invarg("Invalid source port.", *argv);
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		} else if (strcmp(*argv, "encap-dport") == 0) {
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			NEXT_ARG();
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			if (get_u16(&encapdport, *argv, 0))
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				invarg("Invalid destination port.", *argv);
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		} else if (strcmp(*argv, "encap-csum") == 0) {
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			encapflags |= TUNNEL_ENCAP_FLAG_CSUM;
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		} else if (strcmp(*argv, "noencap-csum") == 0) {
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			encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
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		} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
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			encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
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		} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
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			encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
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		} else if (strcmp(*argv, "encap-remcsum") == 0) {
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			encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
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		} else if (strcmp(*argv, "noencap-remcsum") == 0) {
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			encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
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		} else if (strcmp(*argv, "external") == 0) {
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			metadata = 1;
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		} else {
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			ip6tunnel_print_help(lu, argc, argv, stderr);
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			return -1;
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		}
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		argc--, argv++;
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	}
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	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
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	if (metadata) {
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		addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
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		return 0;
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	}
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	if (is_addrtype_inet_not_unspec(&saddr)) {
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		addattr_l(n, 1024, IFLA_IPTUN_LOCAL,
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			  saddr.data, saddr.bytelen);
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	}
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	if (is_addrtype_inet_not_unspec(&daddr)) {
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		addattr_l(n, 1024, IFLA_IPTUN_REMOTE,
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			  daddr.data, daddr.bytelen);
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	}
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	addattr8(n, 1024, IFLA_IPTUN_TTL, hop_limit);
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	addattr8(n, 1024, IFLA_IPTUN_ENCAP_LIMIT, encap_limit);
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	addattr32(n, 1024, IFLA_IPTUN_FLOWINFO, flowinfo);
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	addattr32(n, 1024, IFLA_IPTUN_FLAGS, flags);
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	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
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	addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);
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	addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
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	addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
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	addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
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	addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));
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	return 0;
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}
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static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
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{
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	char s2[64];
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	__u32 flags = 0;
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	__u32 flowinfo = 0;
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	__u8 ttl = 0;
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	if (!tb)
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		return;
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	if (tb[IFLA_IPTUN_COLLECT_METADATA]) {
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		print_bool(PRINT_ANY, "external", "external ", true);
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		return;
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	}
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	if (tb[IFLA_IPTUN_FLAGS])
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		flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]);
Packit d3f73b
Packit d3f73b
	if (tb[IFLA_IPTUN_FLOWINFO])
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		flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]);
Packit d3f73b
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	if (tb[IFLA_IPTUN_PROTO]) {
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		switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
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		case IPPROTO_IPIP:
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			print_string(PRINT_ANY, "proto", "%s ", "ipip6");
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			break;
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		case IPPROTO_IPV6:
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			print_string(PRINT_ANY, "proto", "%s ", "ip6ip6");
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			break;
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		case 0:
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			print_string(PRINT_ANY, "proto", "%s ", "any");
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			break;
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		}
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	}
Packit d3f73b
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	tnl_print_endpoint("remote", tb[IFLA_IPTUN_REMOTE], AF_INET6);
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	tnl_print_endpoint("local", tb[IFLA_IPTUN_LOCAL], AF_INET6);
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	if (tb[IFLA_IPTUN_LINK]) {
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		__u32 link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
Packit d3f73b
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		if (link) {
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			print_string(PRINT_ANY, "link", "dev %s ",
Packit d3f73b
				     ll_index_to_name(link));
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		}
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	}
Packit d3f73b
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	if (tb[IFLA_IPTUN_TTL])
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		ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]);
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	if (is_json_context() || ttl)
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		print_uint(PRINT_ANY, "ttl", "hoplimit %u ", ttl);
Packit d3f73b
	else
Packit d3f73b
		print_string(PRINT_FP, NULL, "hoplimit %s ", "inherit");
Packit d3f73b
Packit d3f73b
	if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT) {
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		print_bool(PRINT_ANY,
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			   "ip6_tnl_f_ign_encap_limit",
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			   "encaplimit none ",
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			   true);
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	} else if (tb[IFLA_IPTUN_ENCAP_LIMIT]) {
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		__u8 val = rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]);
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Packit d3f73b
		print_uint(PRINT_ANY, "encap_limit", "encaplimit %u ", val);
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	}
Packit d3f73b
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	if (flags & IP6_TNL_F_USE_ORIG_TCLASS) {
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		print_bool(PRINT_ANY,
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			   "ip6_tnl_f_use_orig_tclass",
Packit d3f73b
			   "tclass inherit ",
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			   true);
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	} else if (tb[IFLA_IPTUN_FLOWINFO]) {
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		__u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS) >> 20;
Packit d3f73b
Packit d3f73b
		snprintf(s2, sizeof(s2), "0x%02x", val);
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		print_string(PRINT_ANY, "tclass", "tclass %s ", s2);
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	}
Packit d3f73b
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	if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) {
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		print_bool(PRINT_ANY,
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			   "ip6_tnl_f_use_orig_flowlabel",
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			   "flowlabel inherit ",
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			   true);
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	} else if (tb[IFLA_IPTUN_FLOWINFO]) {
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		__u32 val = ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL);
Packit d3f73b
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		snprintf(s2, sizeof(s2), "0x%05x", val);
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		print_string(PRINT_ANY, "flowlabel", "flowlabel %s ", s2);
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	}
Packit d3f73b
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	if (flags & IP6_TNL_F_RCV_DSCP_COPY)
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		print_bool(PRINT_ANY,
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			   "ip6_tnl_f_rcv_dscp_copy",
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			   "dscp inherit ",
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			   true);
Packit d3f73b
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	if (flags & IP6_TNL_F_MIP6_DEV)
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		print_bool(PRINT_ANY, "ip6_tnl_f_mip6_dev", "mip6 ", true);
Packit d3f73b
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	if (flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE)
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		print_bool(PRINT_ANY,
Packit d3f73b
			   "ip6_tnl_f_allow_local_remote",
Packit d3f73b
			   "allow-localremote ",
Packit d3f73b
			   true);
Packit d3f73b
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	if (flags & IP6_TNL_F_USE_ORIG_FWMARK) {
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		print_bool(PRINT_ANY,
Packit d3f73b
			   "ip6_tnl_f_use_orig_fwmark",
Packit d3f73b
			   "fwmark inherit ",
Packit d3f73b
			   true);
Packit d3f73b
	} else if (tb[IFLA_IPTUN_FWMARK]) {
Packit d3f73b
		__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
Packit d3f73b
Packit d3f73b
		if (fwmark) {
Packit d3f73b
			print_0xhex(PRINT_ANY,
Packit d3f73b
				    "fwmark", "fwmark %#llx ", fwmark);
Packit d3f73b
		}
Packit d3f73b
	}
Packit d3f73b
Packit d3f73b
	tnl_print_encap(tb,
Packit d3f73b
			IFLA_IPTUN_ENCAP_TYPE,
Packit d3f73b
			IFLA_IPTUN_ENCAP_FLAGS,
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			IFLA_IPTUN_ENCAP_SPORT,
Packit d3f73b
			IFLA_IPTUN_ENCAP_DPORT);
Packit d3f73b
}
Packit d3f73b
Packit d3f73b
struct link_util ip6tnl_link_util = {
Packit d3f73b
	.id = "ip6tnl",
Packit d3f73b
	.maxattr = IFLA_IPTUN_MAX,
Packit d3f73b
	.parse_opt = ip6tunnel_parse_opt,
Packit d3f73b
	.print_opt = ip6tunnel_print_opt,
Packit d3f73b
	.print_help = ip6tunnel_print_help,
Packit d3f73b
};