ip6tnl: introduce ip6 tunnel support

This patch adds support for ip6 tunnel that works with
the ip6_tunnel kernel module.

Signed-off-by: Susant Sahani <susant@redhat.com>
Signed-off-by: Thomas Haller <thaller@redhat.com>

1 files changed, 688 insertions, 0 deletions

diff --git a/lib/route/link/ip6tnl.c b/lib/route/link/ip6tnl.c
new file mode 100644
index 0000000..ed79e82
--- /dev/null
+++ b/lib/route/link/ip6tnl.c
@@ -0,0 +1,688 @@
+/*
+ * lib/route/link/ip6tnl.c        IP6TNL Link Info
+ *
+ *      This library is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU Lesser General Public
+ *      License as published by the Free Software Foundation version 2.1
+ *      of the License.
+ *
+ * Copyright (c) 2014 Susant Sahani <susant@redhat.com>
+ */
+
+/**
+ * @ingroup link
+ * @defgroup ip6tnl IP6TNL
+ * ip6tnl link module
+ *
+ * @details
+ * \b Link Type Name: "ip6tnl"
+ *
+ * @route_doc{link_ip6tnl, IP6TNL Documentation}
+ *
+ * @{
+ */
+
+#include <netlink-private/netlink.h>
+#include <netlink/netlink.h>
+#include <netlink/attr.h>
+#include <netlink/utils.h>
+#include <netlink/object.h>
+#include <netlink/route/rtnl.h>
+#include <netlink-private/route/link/api.h>
+#include <linux/if_tunnel.h>
+#include <linux/in6.h>
+
+#define IP6_TNL_ATTR_LINK          (1 << 0)
+#define IP6_TNL_ATTR_LOCAL         (1 << 1)
+#define IP6_TNL_ATTR_REMOTE        (1 << 2)
+#define IP6_TNL_ATTR_TTL           (1 << 3)
+#define IP6_TNL_ATTR_TOS           (1 << 4)
+#define IP6_TNL_ATTR_ENCAPLIMIT    (1 << 5)
+#define IP6_TNL_ATTR_FLAGS         (1 << 6)
+#define IP6_TNL_ATTR_PROTO         (1 << 7)
+#define IP6_TNL_ATTR_FLOWINFO      (1 << 8)
+
+struct ip6_tnl_info
+{
+	uint8_t                 ttl;
+	uint8_t                 tos;
+	uint8_t                 encap_limit;
+	uint8_t                 proto;
+	uint32_t                flags;
+	uint32_t                link;
+	uint32_t                flowinfo;
+	struct in6_addr         local;
+	struct in6_addr         remote;
+	uint32_t                ip6_tnl_mask;
+};
+
+static struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
+	[IFLA_IPTUN_LINK]         = { .type = NLA_U32 },
+	[IFLA_IPTUN_LOCAL]        = { .minlen = sizeof(struct in6_addr) },
+	[IFLA_IPTUN_REMOTE]       = { .minlen = sizeof(struct in6_addr) },
+	[IFLA_IPTUN_TTL]          = { .type = NLA_U8 },
+	[IFLA_IPTUN_TOS]          = { .type = NLA_U8 },
+	[IFLA_IPTUN_ENCAP_LIMIT]  = { .type = NLA_U8 },
+	[IFLA_IPTUN_FLOWINFO]     = { .type = NLA_U32 },
+	[IFLA_IPTUN_FLAGS]        = { .type = NLA_U32 },
+	[IFLA_IPTUN_PROTO]        = { .type = NLA_U8 },
+};
+
+static int ip6_tnl_alloc(struct rtnl_link *link)
+{
+	struct ip6_tnl_info *ip6_tnl;
+
+	ip6_tnl = calloc(1, sizeof(*ip6_tnl));
+	if (!ip6_tnl)
+		return -NLE_NOMEM;
+
+	link->l_info = ip6_tnl;
+
+	return 0;
+}
+
+static int ip6_tnl_parse(struct rtnl_link *link, struct nlattr *data,
+			 struct nlattr *xstats)
+{
+	struct nlattr *tb[IFLA_IPTUN_MAX + 1];
+	struct ip6_tnl_info *ip6_tnl;
+	int err;
+
+	NL_DBG(3, "Parsing IP6_TNL link info");
+
+	err = nla_parse_nested(tb, IFLA_IPTUN_MAX, data, ip6_tnl_policy);
+	if (err < 0)
+		goto errout;
+
+	err = ip6_tnl_alloc(link);
+	if (err < 0)
+		goto errout;
+
+	ip6_tnl = link->l_info;
+
+	if (tb[IFLA_IPTUN_LINK]) {
+		ip6_tnl->link = nla_get_u32(tb[IFLA_IPTUN_LINK]);
+		ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_LINK;
+	}
+
+	if (tb[IFLA_IPTUN_LOCAL]) {
+		nla_memcpy(&ip6_tnl->local, tb[IFLA_IPTUN_LOCAL], sizeof(struct in6_addr));
+		ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_LOCAL;
+	}
+
+	if (tb[IFLA_IPTUN_REMOTE]) {
+		nla_memcpy(&ip6_tnl->remote, tb[IFLA_IPTUN_REMOTE], sizeof(struct in6_addr));
+		ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_REMOTE;
+	}
+
+	if (tb[IFLA_IPTUN_TTL]) {
+		ip6_tnl->ttl = nla_get_u8(tb[IFLA_IPTUN_TTL]);
+		ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_TTL;
+	}
+
+	if (tb[IFLA_IPTUN_TOS]) {
+		ip6_tnl->tos = nla_get_u8(tb[IFLA_IPTUN_TOS]);
+		ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_TOS;
+	}
+
+	if (tb[IFLA_IPTUN_ENCAP_LIMIT]) {
+		ip6_tnl->encap_limit = nla_get_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]);
+		ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_ENCAPLIMIT;
+	}
+
+	if (tb[IFLA_IPTUN_FLAGS]) {
+		ip6_tnl->flags = nla_get_u32(tb[IFLA_IPTUN_FLAGS]);
+		ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_FLAGS;
+	}
+
+	if (tb[IFLA_IPTUN_FLOWINFO]) {
+		ip6_tnl->flowinfo = nla_get_u32(tb[IFLA_IPTUN_FLOWINFO]);
+		ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_FLOWINFO;
+	}
+
+	if (tb[IFLA_IPTUN_PROTO]) {
+		ip6_tnl->proto = nla_get_u8(tb[IFLA_IPTUN_PROTO]);
+		ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_PROTO;
+	}
+
+	err = 0;
+
+errout:
+	return err;
+}
+
+static int ip6_tnl_put_attrs(struct nl_msg *msg, struct rtnl_link *link)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+	struct nlattr *data;
+
+	data = nla_nest_start(msg, IFLA_INFO_DATA);
+	if (!data)
+		return -NLE_MSGSIZE;
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_LINK)
+		NLA_PUT_U32(msg, IFLA_IPTUN_LINK, ip6_tnl->link);
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_LOCAL)
+		NLA_PUT(msg, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), &ip6_tnl->local);
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_REMOTE)
+		NLA_PUT(msg, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), &ip6_tnl->remote);
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_TTL)
+		NLA_PUT_U8(msg, IFLA_IPTUN_TTL, ip6_tnl->ttl);
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_TOS)
+		NLA_PUT_U8(msg, IFLA_IPTUN_TOS, ip6_tnl->tos);
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_ENCAPLIMIT)
+		NLA_PUT_U8(msg, IFLA_IPTUN_ENCAP_LIMIT, ip6_tnl->encap_limit);
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_FLAGS)
+		NLA_PUT_U32(msg, IFLA_IPTUN_FLAGS, ip6_tnl->flags);
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_FLOWINFO)
+		NLA_PUT_U32(msg, IFLA_IPTUN_FLOWINFO, ip6_tnl->flowinfo);
+
+	/* kernel crashes if this attribure is missing  temporary fix */
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_PROTO)
+		NLA_PUT_U8(msg, IFLA_IPTUN_PROTO, ip6_tnl->proto);
+	else
+		NLA_PUT_U8(msg, IFLA_IPTUN_PROTO, 0);
+
+	nla_nest_end(msg, data);
+
+nla_put_failure:
+	return 0;
+}
+
+static void ip6_tnl_free(struct rtnl_link *link)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	free(ip6_tnl);
+	link->l_info = NULL;
+}
+
+static void ip6_tnl_dump_line(struct rtnl_link *link, struct nl_dump_params *p)
+{
+	nl_dump(p, "ip6_tnl : %s", link->l_name);
+}
+
+static void ip6_tnl_dump_details(struct rtnl_link *link, struct nl_dump_params *p)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+	char *name, addr[INET6_ADDRSTRLEN];
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_LINK) {
+		nl_dump(p, "      link ");
+		name = rtnl_link_get_name(link);
+		if (name)
+			nl_dump_line(p, "%s\n", name);
+		else
+			nl_dump_line(p, "%u\n", ip6_tnl->link);
+	}
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_LOCAL) {
+		nl_dump(p, "      local ");
+
+		if(inet_ntop(AF_INET6, &ip6_tnl->local, addr, INET6_ADDRSTRLEN))
+			nl_dump_line(p, "%s\n", addr);
+		else
+			nl_dump_line(p, "%#x\n", ip6_tnl->local);
+	}
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_REMOTE) {
+		nl_dump(p, "      remote ");
+
+		if(inet_ntop(AF_INET6, &ip6_tnl->remote, addr, INET6_ADDRSTRLEN))
+			nl_dump_line(p, "%s\n", addr);
+		else
+			nl_dump_line(p, "%#x\n", ip6_tnl->remote);
+	}
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_TTL) {
+		nl_dump(p, "      ttl ");
+		nl_dump_line(p, "%d\n", ip6_tnl->ttl);
+	}
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_TOS) {
+		nl_dump(p, "      tos ");
+		nl_dump_line(p, "%d\n", ip6_tnl->tos);
+	}
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_ENCAPLIMIT) {
+		nl_dump(p, "      encaplimit ");
+		nl_dump_line(p, "%d\n", ip6_tnl->encap_limit);
+	}
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_FLAGS) {
+		nl_dump(p, "      flags ");
+		nl_dump_line(p, " (%x)\n", ip6_tnl->flags);
+	}
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_FLOWINFO) {
+		nl_dump(p, "      flowinfo ");
+		nl_dump_line(p, " (%x)\n", ip6_tnl->flowinfo);
+	}
+
+	if (ip6_tnl->ip6_tnl_mask & IP6_TNL_ATTR_PROTO) {
+		nl_dump(p, "    proto   ");
+		nl_dump_line(p, " (%x)\n", ip6_tnl->proto);
+	}
+}
+
+static int ip6_tnl_clone(struct rtnl_link *dst, struct rtnl_link *src)
+{
+	struct ip6_tnl_info *ip6_tnl_dst, *ip6_tnl_src = src->l_info;
+	int err;
+
+	dst->l_info = NULL;
+
+	err = rtnl_link_set_type(dst, "ip6tnl");
+	if (err < 0)
+		return err;
+
+	ip6_tnl_dst = dst->l_info;
+
+	if (!ip6_tnl_dst || !ip6_tnl_src)
+		BUG();
+
+	memcpy(ip6_tnl_dst, ip6_tnl_src, sizeof(struct ip6_tnl_info));
+
+	return 0;
+}
+
+static struct rtnl_link_info_ops ip6_tnl_info_ops = {
+	.io_name                = "ip6tnl",
+	.io_alloc               = ip6_tnl_alloc,
+	.io_parse               = ip6_tnl_parse,
+	.io_dump = {
+		[NL_DUMP_LINE]  = ip6_tnl_dump_line,
+		[NL_DUMP_DETAILS] = ip6_tnl_dump_details,
+	},
+	.io_clone               = ip6_tnl_clone,
+	.io_put_attrs           = ip6_tnl_put_attrs,
+	.io_free                = ip6_tnl_free,
+};
+
+#define IS_IP6_TNL_LINK_ASSERT(link)\
+	if ((link)->l_info_ops != &ip6_tnl_info_ops) {\
+		APPBUG("Link is not a ip6_tnl link. set type \"ip6tnl\" first.");\
+		return -NLE_OPNOTSUPP;\
+	}
+
+struct rtnl_link *rtnl_link_ip6_tnl_alloc(void)
+{
+	struct rtnl_link *link;
+	int err;
+
+	link = rtnl_link_alloc();
+	if (!link)
+		return NULL;
+
+	err = rtnl_link_set_type(link, "ip6tnl");
+	if (err < 0) {
+		rtnl_link_put(link);
+		return NULL;
+	}
+
+	return link;
+}
+
+/**
+ * Check if link is a IP6_TNL link
+ * @arg link            Link object
+ *
+ * @return True if link is a IP6_TNL link, otherwise false is returned.
+ */
+int rtnl_link_is_ip6_tnl(struct rtnl_link *link)
+{
+	return link->l_info_ops && !strcmp(link->l_info_ops->io_name, "ip6tnl");
+}
+
+/**
+ * Create a new ip6_tnl tunnel device
+ * @arg sock            netlink socket
+ * @arg name            name of the tunnel device
+ *
+ * Creates a new ip6_tnl tunnel device in the kernel
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_add(struct nl_sock *sk, const char *name)
+{
+	struct rtnl_link *link;
+	int err;
+
+	link = rtnl_link_ip6_tnl_alloc();
+	if (!link)
+		return -NLE_NOMEM;
+
+	if(name)
+		rtnl_link_set_name(link, name);
+
+	err = rtnl_link_add(sk, link, NLM_F_CREATE);
+	rtnl_link_put(link);
+
+	return err;
+}
+
+/**
+ * Set IP6_TNL tunnel interface index
+ * @arg link            Link object
+ * @arg index           interface index
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_set_link(struct rtnl_link *link, uint32_t index)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	ip6_tnl->link = index;
+	ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_LINK;
+
+	return 0;
+}
+
+/**
+ * Get IP6_TNL tunnel interface index
+ * @arg link            Link object
+ *
+ * @return interface index value
+ */
+uint32_t rtnl_link_ip6_tnl_get_link(struct rtnl_link *link)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	return ip6_tnl->link;
+}
+
+/**
+ * Set IP6_TNL tunnel local address
+ * @arg link            Link object
+ * @arg addr            local address
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_set_local(struct rtnl_link *link, struct in6_addr *addr)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	memcpy(&ip6_tnl->local, addr, sizeof(struct in6_addr));
+	ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_LOCAL;
+
+	return 0;
+}
+
+/**
+ * Get IP6_TNL tunnel local address
+ * @arg link            Link object
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_get_local(struct rtnl_link *link, struct in6_addr *addr)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	memcpy(addr, &ip6_tnl->local, sizeof(struct in6_addr));
+
+	return 0;
+}
+
+/**
+ * Set IP6_TNL tunnel remote address
+ * @arg link            Link object
+ * @arg remote          remote address
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_set_remote(struct rtnl_link *link, struct in6_addr *addr)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	memcpy(&ip6_tnl->remote, addr, sizeof(struct in6_addr));
+	ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_REMOTE;
+
+	return 0;
+}
+
+/**
+ * Get IP6_TNL tunnel remote address
+ * @arg link            Link object
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_get_remote(struct rtnl_link *link, struct in6_addr *addr)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	memcpy(addr, &ip6_tnl->remote, sizeof(struct in6_addr));
+
+	return 0;
+}
+
+/**
+ * Set IP6_TNL tunnel ttl
+ * @arg link            Link object
+ * @arg ttl             tunnel ttl
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_set_ttl(struct rtnl_link *link, uint8_t ttl)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	ip6_tnl->ttl = ttl;
+	ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_TTL;
+
+	return 0;
+}
+
+/**
+ * Get IP6_TNL tunnel ttl
+ * @arg link            Link object
+ *
+ * @return ttl value
+ */
+uint8_t rtnl_link_ip6_tnl_get_ttl(struct rtnl_link *link)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	return ip6_tnl->ttl;
+}
+
+/**
+ * Set IP6_TNL tunnel tos
+ * @arg link            Link object
+ * @arg tos             tunnel tos
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_set_tos(struct rtnl_link *link, uint8_t tos)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	ip6_tnl->tos = tos;
+	ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_TOS;
+
+	return 0;
+}
+
+/**
+ * Get IP6_TNL tunnel tos
+ * @arg link            Link object
+ *
+ * @return tos value
+ */
+uint8_t rtnl_link_ip6_tnl_get_tos(struct rtnl_link *link)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	return ip6_tnl->tos;
+}
+
+/**
+ * Set IP6_TNL tunnel encap limit
+ * @arg link            Link object
+ * @arg encap_limit     encaplimit value
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_set_encaplimit(struct rtnl_link *link, uint8_t encap_limit)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	ip6_tnl->encap_limit = encap_limit;
+	ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_ENCAPLIMIT;
+
+	return 0;
+}
+
+/**
+ * Get IP6_TNL encaplimit
+ * @arg link            Link object
+ *
+ * @return encaplimit value
+ */
+uint8_t rtnl_link_ip6_tnl_get_encaplimit(struct rtnl_link *link)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	return ip6_tnl->encap_limit;
+}
+
+/**
+ * Set IP6_TNL tunnel flowinfo
+ * @arg link            Link object
+ * @arg flowinfo        flowinfo value
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_set_flowinfo(struct rtnl_link *link, uint32_t flowinfo)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	ip6_tnl->flowinfo = flowinfo;
+	ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_FLOWINFO;
+
+	return 0;
+}
+
+/**
+ * Get IP6_TNL flowinfo
+ * @arg link            Link object
+ *
+ * @return flowinfo value
+ */
+uint32_t rtnl_link_ip6_tnl_get_flowinfo(struct rtnl_link *link)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	return ip6_tnl->flowinfo;
+}
+
+/**
+ * Set IP6_TNL tunnel flags
+ * @arg link            Link object
+ * @arg flags           tunnel flags
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_set_flags(struct rtnl_link *link, uint32_t flags)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	ip6_tnl->flags = flags;
+	ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_FLAGS;
+
+	return 0;
+}
+
+/**
+ * Get IP6_TNL path flags
+ * @arg link            Link object
+ *
+ * @return flags value
+ */
+uint32_t rtnl_link_ip6_tnl_get_flags(struct rtnl_link *link)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	return ip6_tnl->flags;
+}
+
+/**
+ * Set IP6_TNL tunnel proto
+ * @arg link            Link object
+ * @arg proto           tunnel proto
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_link_ip6_tnl_set_proto(struct rtnl_link *link, uint8_t proto)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	ip6_tnl->proto = proto;
+	ip6_tnl->ip6_tnl_mask |= IP6_TNL_ATTR_PROTO;
+
+	return 0;
+}
+
+/**
+ * Get IP6_TNL proto
+ * @arg link            Link object
+ *
+ * @return proto value
+ */
+uint8_t rtnl_link_ip6_tnl_get_proto(struct rtnl_link *link)
+{
+	struct ip6_tnl_info *ip6_tnl = link->l_info;
+
+	IS_IP6_TNL_LINK_ASSERT(link);
+
+	return ip6_tnl->proto;
+}
+
+static void __init ip6_tnl_init(void)
+{
+	rtnl_link_register_info(&ip6_tnl_info_ops);
+}
+
+static void __exit ip6_tnl_exit(void)
+{
+	rtnl_link_unregister_info(&ip6_tnl_info_ops);
+}