/*
* 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 <netinet/in.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);
}