/*
* lib/route/link/ipgre.c IPGRE 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 ipgre IPGRE
* ipgre link module
*
* @details
* \b Link Type Name: "ipgre"
*
* @route_doc{link_ipgre, IPGRE 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>
#define IPGRE_ATTR_LINK (1 << 0)
#define IPGRE_ATTR_IFLAGS (1 << 1)
#define IPGRE_ATTR_OFLAGS (1 << 2)
#define IPGRE_ATTR_IKEY (1 << 3)
#define IPGRE_ATTR_OKEY (1 << 4)
#define IPGRE_ATTR_LOCAL (1 << 5)
#define IPGRE_ATTR_REMOTE (1 << 6)
#define IPGRE_ATTR_TTL (1 << 7)
#define IPGRE_ATTR_TOS (1 << 8)
#define IPGRE_ATTR_PMTUDISC (1 << 9)
struct ipgre_info
{
uint8_t ttl;
uint8_t tos;
uint8_t pmtudisc;
uint16_t iflags;
uint16_t oflags;
uint32_t ikey;
uint32_t okey;
uint32_t link;
uint32_t local;
uint32_t remote;
uint32_t ipgre_mask;
};
static struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = {
[IFLA_GRE_LINK] = { .type = NLA_U32 },
[IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
[IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
[IFLA_GRE_IKEY] = { .type = NLA_U32 },
[IFLA_GRE_OKEY] = { .type = NLA_U32 },
[IFLA_GRE_LOCAL] = { .type = NLA_U32 },
[IFLA_GRE_REMOTE] = { .type = NLA_U32 },
[IFLA_GRE_TTL] = { .type = NLA_U8 },
[IFLA_GRE_TOS] = { .type = NLA_U8 },
[IFLA_GRE_PMTUDISC] = { .type = NLA_U8 },
};
static int ipgre_alloc(struct rtnl_link *link)
{
struct ipgre_info *ipgre;
ipgre = calloc(1, sizeof(*ipgre));
if (!ipgre)
return -NLE_NOMEM;
link->l_info = ipgre;
return 0;
}
static int ipgre_parse(struct rtnl_link *link, struct nlattr *data,
struct nlattr *xstats)
{
struct nlattr *tb[IFLA_IPTUN_MAX + 1];
struct ipgre_info *ipgre;
int err;
NL_DBG(3, "Parsing IPGRE link info");
err = nla_parse_nested(tb, IFLA_GRE_MAX, data, ipgre_policy);
if (err < 0)
goto errout;
err = ipgre_alloc(link);
if (err < 0)
goto errout;
ipgre = link->l_info;
if (tb[IFLA_GRE_LINK]) {
ipgre->link = nla_get_u32(tb[IFLA_GRE_LINK]);
ipgre->ipgre_mask |= IPGRE_ATTR_LINK;
}
if (tb[IFLA_GRE_IFLAGS]) {
ipgre->iflags = nla_get_u16(tb[IFLA_GRE_IFLAGS]);
ipgre->ipgre_mask |= IPGRE_ATTR_IFLAGS;
}
if (tb[IFLA_GRE_OFLAGS]) {
ipgre->oflags = nla_get_u16(tb[IFLA_GRE_OFLAGS]);
ipgre->ipgre_mask |= IPGRE_ATTR_OFLAGS;
}
if (tb[IFLA_GRE_IKEY]) {
ipgre->ikey = nla_get_u32(tb[IFLA_GRE_IKEY]);
ipgre->ipgre_mask |= IPGRE_ATTR_IKEY;
}
if (tb[IFLA_GRE_OKEY]) {
ipgre->okey = nla_get_u32(tb[IFLA_GRE_OKEY]);
ipgre->ipgre_mask |= IPGRE_ATTR_OKEY;
}
if (tb[IFLA_GRE_LOCAL]) {
ipgre->local = nla_get_u32(tb[IFLA_GRE_LOCAL]);
ipgre->ipgre_mask |= IPGRE_ATTR_LOCAL;
}
if (tb[IFLA_GRE_LOCAL]) {
ipgre->remote = nla_get_u32(tb[IFLA_GRE_LOCAL]);
ipgre->ipgre_mask |= IPGRE_ATTR_REMOTE;
}
if (tb[IFLA_GRE_TTL]) {
ipgre->ttl = nla_get_u8(tb[IFLA_GRE_TTL]);
ipgre->ipgre_mask |= IPGRE_ATTR_TTL;
}
if (tb[IFLA_GRE_TOS]) {
ipgre->tos = nla_get_u8(tb[IFLA_GRE_TOS]);
ipgre->ipgre_mask |= IPGRE_ATTR_TOS;
}
if (tb[IFLA_GRE_PMTUDISC]) {
ipgre->pmtudisc = nla_get_u8(tb[IFLA_GRE_PMTUDISC]);
ipgre->ipgre_mask |= IPGRE_ATTR_PMTUDISC;
}
err = 0;
errout:
return err;
}
static int ipgre_put_attrs(struct nl_msg *msg, struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
struct nlattr *data;
data = nla_nest_start(msg, IFLA_INFO_DATA);
if (!data)
return -NLE_MSGSIZE;
if (ipgre->ipgre_mask & IPGRE_ATTR_LINK)
NLA_PUT_U32(msg, IFLA_GRE_LINK, ipgre->link);
if (ipgre->ipgre_mask & IFLA_GRE_IFLAGS)
NLA_PUT_U16(msg, IFLA_GRE_IFLAGS, ipgre->iflags);
if (ipgre->ipgre_mask & IFLA_GRE_OFLAGS)
NLA_PUT_U16(msg, IFLA_GRE_OFLAGS, ipgre->oflags);
if (ipgre->ipgre_mask & IPGRE_ATTR_IKEY)
NLA_PUT_U32(msg, IFLA_GRE_IKEY, ipgre->ikey);
if (ipgre->ipgre_mask & IPGRE_ATTR_OKEY)
NLA_PUT_U32(msg, IFLA_GRE_OKEY, ipgre->okey);
if (ipgre->ipgre_mask & IPGRE_ATTR_LOCAL)
NLA_PUT_U32(msg, IFLA_GRE_LOCAL, ipgre->local);
if (ipgre->ipgre_mask & IPGRE_ATTR_REMOTE)
NLA_PUT_U32(msg, IFLA_GRE_REMOTE, ipgre->remote);
if (ipgre->ipgre_mask & IPGRE_ATTR_TTL)
NLA_PUT_U8(msg, IFLA_GRE_TTL, ipgre->ttl);
if (ipgre->ipgre_mask & IPGRE_ATTR_TOS)
NLA_PUT_U8(msg, IFLA_GRE_TOS, ipgre->tos);
if (ipgre->ipgre_mask & IPGRE_ATTR_PMTUDISC)
NLA_PUT_U8(msg, IFLA_GRE_PMTUDISC, ipgre->pmtudisc);
nla_nest_end(msg, data);
nla_put_failure:
return 0;
}
static void ipgre_free(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
free(ipgre);
link->l_info = NULL;
}
static void ipgre_dump_line(struct rtnl_link *link, struct nl_dump_params *p)
{
nl_dump(p, "ipgre : %s", link->l_name);
}
static void ipgre_dump_details(struct rtnl_link *link, struct nl_dump_params *p)
{
struct ipgre_info *ipgre = link->l_info;
char *name, addr[INET_ADDRSTRLEN];
if (ipgre->ipgre_mask & IPGRE_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", ipgre->link);
}
if (ipgre->ipgre_mask & IPGRE_ATTR_IFLAGS) {
nl_dump(p, " iflags ");
nl_dump_line(p, "%x\n", ipgre->iflags);
}
if (ipgre->ipgre_mask & IPGRE_ATTR_OFLAGS) {
nl_dump(p, " oflags ");
nl_dump_line(p, "%x\n", ipgre->oflags);
}
if (ipgre->ipgre_mask & IPGRE_ATTR_IKEY) {
nl_dump(p, " ikey ");
nl_dump_line(p, "%x\n",ipgre->ikey);
}
if (ipgre->ipgre_mask & IPGRE_ATTR_OKEY) {
nl_dump(p, " okey ");
nl_dump_line(p, "%x\n", ipgre->okey);
}
if (ipgre->ipgre_mask & IPGRE_ATTR_LOCAL) {
nl_dump(p, " local ");
if(inet_ntop(AF_INET, &ipgre->local, addr, sizeof(addr)))
nl_dump_line(p, "%s\n", addr);
else
nl_dump_line(p, "%#x\n", ntohs(ipgre->local));
}
if (ipgre->ipgre_mask & IPGRE_ATTR_REMOTE) {
nl_dump(p, " remote ");
if(inet_ntop(AF_INET, &ipgre->remote, addr, sizeof(addr)))
nl_dump_line(p, "%s\n", addr);
else
nl_dump_line(p, "%#x\n", ntohs(ipgre->remote));
}
if (ipgre->ipgre_mask & IPGRE_ATTR_TTL) {
nl_dump(p, " ttl ");
nl_dump_line(p, "%u\n", ipgre->ttl);
}
if (ipgre->ipgre_mask & IPGRE_ATTR_TOS) {
nl_dump(p, " tos ");
nl_dump_line(p, "%u\n", ipgre->tos);
}
if (ipgre->ipgre_mask & IPGRE_ATTR_PMTUDISC) {
nl_dump(p, " pmtudisc ");
nl_dump_line(p, "enabled (%#x)\n", ipgre->pmtudisc);
}
}
static int ipgre_clone(struct rtnl_link *dst, struct rtnl_link *src)
{
struct ipgre_info *ipgre_dst, *ipgre_src = src->l_info;
int err;
dst->l_info = NULL;
err = rtnl_link_set_type(dst, "gre");
if (err < 0)
return err;
ipgre_dst = dst->l_info;
if (!ipgre_dst || !ipgre_src)
BUG();
memcpy(ipgre_dst, ipgre_src, sizeof(struct ipgre_info));
return 0;
}
static struct rtnl_link_info_ops ipgre_info_ops = {
.io_name = "gre",
.io_alloc = ipgre_alloc,
.io_parse = ipgre_parse,
.io_dump = {
[NL_DUMP_LINE] = ipgre_dump_line,
[NL_DUMP_DETAILS] = ipgre_dump_details,
},
.io_clone = ipgre_clone,
.io_put_attrs = ipgre_put_attrs,
.io_free = ipgre_free,
};
#define IS_IPGRE_LINK_ASSERT(link) \
if ((link)->l_info_ops != &ipgre_info_ops) { \
APPBUG("Link is not a ipgre link. set type \"gre\" first.");\
return -NLE_OPNOTSUPP; \
}
struct rtnl_link *rtnl_link_ipgre_alloc(void)
{
struct rtnl_link *link;
int err;
link = rtnl_link_alloc();
if (!link)
return NULL;
err = rtnl_link_set_type(link, "gre");
if (err < 0) {
rtnl_link_put(link);
return NULL;
}
return link;
}
/**
* Check if link is a IPGRE link
* @arg link Link object
*
* @return True if link is a IPGRE link, otherwise 0 is returned.
*/
int rtnl_link_is_ipgre(struct rtnl_link *link)
{
return link->l_info_ops && !strcmp(link->l_info_ops->io_name, "gre");
}
/**
* Create a new ipip tunnel device
* @arg sock netlink socket
* @arg name name of the tunnel deviceL
*
* Creates a new ipip tunnel device in the kernel
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_add(struct nl_sock *sk, const char *name)
{
struct rtnl_link *link;
int err;
link = rtnl_link_ipgre_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 IPGRE tunnel interface index
* @arg link Link object
* @arg index interface index
*
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_set_link(struct rtnl_link *link, uint32_t index)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
ipgre->link = index;
ipgre->ipgre_mask |= IPGRE_ATTR_LINK;
return 0;
}
/**
* Get IPGRE tunnel interface index
* @arg link Link object
*
* @return interface index
*/
uint32_t rtnl_link_ipgre_get_link(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
return ipgre->link;
}
/**
* Set IPGRE tunnel set iflags
* @arg link Link object
* @arg iflags gre iflags
*
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_set_iflags(struct rtnl_link *link, uint16_t iflags)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
ipgre->iflags = iflags;
ipgre->ipgre_mask |= IPGRE_ATTR_IFLAGS;
return 0;
}
/**
* Get IPGRE tunnel iflags
* @arg link Link object
*
* @return iflags
*/
uint16_t rtnl_link_ipgre_get_iflags(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
return ipgre->iflags;
}
/**
* Set IPGRE tunnel set oflags
* @arg link Link object
* @arg iflags gre oflags
*
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_set_oflags(struct rtnl_link *link, uint16_t oflags)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
ipgre->oflags = oflags;
ipgre->ipgre_mask |= IPGRE_ATTR_OFLAGS;
return 0;
}
/**
* Get IPGRE tunnel oflags
* @arg link Link object
*
* @return oflags
*/
uint16_t rtnl_link_ipgre_get_oflags(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
return ipgre->oflags;
}
/**
* Set IPGRE tunnel set ikey
* @arg link Link object
* @arg ikey gre ikey
*
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_set_ikey(struct rtnl_link *link, uint32_t ikey)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
ipgre->ikey = ikey;
ipgre->ipgre_mask |= IPGRE_ATTR_IKEY;
return 0;
}
/**
* Get IPGRE tunnel ikey
* @arg link Link object
*
* @return ikey
*/
uint32_t rtnl_link_ipgre_get_ikey(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
return ipgre->ikey;
}
/**
* Set IPGRE tunnel set okey
* @arg link Link object
* @arg okey gre okey
*
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_set_okey(struct rtnl_link *link, uint32_t okey)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
ipgre->okey = okey;
ipgre->ipgre_mask |= IPGRE_ATTR_OKEY;
return 0;
}
/**
* Get IPGRE tunnel okey
* @arg link Link object
*
* @return okey value
*/
uint32_t rtnl_link_ipgre_get_okey(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
return ipgre->okey;
}
/**
* Set IPGRE tunnel local address
* @arg link Link object
* @arg addr local address
*
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_set_local(struct rtnl_link *link, uint32_t addr)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
ipgre->local = addr;
ipgre->ipgre_mask |= IPGRE_ATTR_LOCAL;
return 0;
}
/**
* Get IPGRE tunnel local address
* @arg link Link object
*
* @return local address
*/
uint32_t rtnl_link_ipgre_get_local(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
return ipgre->local;
}
/**
* Set IPGRE tunnel remote address
* @arg link Link object
* @arg remote remote address
*
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_set_remote(struct rtnl_link *link, uint32_t remote)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
ipgre->remote = remote;
ipgre->ipgre_mask |= IPGRE_ATTR_REMOTE;
return 0;
}
/**
* Get IPGRE tunnel remote address
* @arg link Link object
*
* @return remote address on success or a negative error code
*/
uint32_t rtnl_link_ipgre_get_remote(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
return ipgre->remote;
}
/**
* Set IPGRE tunnel ttl
* @arg link Link object
* @arg ttl tunnel ttl
*
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_set_ttl(struct rtnl_link *link, uint8_t ttl)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
ipgre->ttl = ttl;
ipgre->ipgre_mask |= IPGRE_ATTR_TTL;
return 0;
}
/**
* Set IPGRE tunnel ttl
* @arg link Link object
*
* @return ttl value
*/
uint8_t rtnl_link_ipgre_get_ttl(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
return ipgre->ttl;
}
/**
* Set IPGRE tunnel tos
* @arg link Link object
* @arg tos tunnel tos
*
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_set_tos(struct rtnl_link *link, uint8_t tos)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
ipgre->tos = tos;
ipgre->ipgre_mask |= IPGRE_ATTR_TOS;
return 0;
}
/**
* Get IPGRE tunnel tos
* @arg link Link object
*
* @return tos value
*/
uint8_t rtnl_link_ipgre_get_tos(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
return ipgre->tos;
}
/**
* Set IPGRE tunnel path MTU discovery
* @arg link Link object
* @arg pmtudisc path MTU discovery
*
* @return 0 on success or a negative error code
*/
int rtnl_link_ipgre_set_pmtudisc(struct rtnl_link *link, uint8_t pmtudisc)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
ipgre->pmtudisc = pmtudisc;
ipgre->ipgre_mask |= IPGRE_ATTR_PMTUDISC;
return 0;
}
/**
* Get IPGRE path MTU discovery
* @arg link Link object
*
* @return pmtudisc value
*/
uint8_t rtnl_link_get_pmtudisc(struct rtnl_link *link)
{
struct ipgre_info *ipgre = link->l_info;
IS_IPGRE_LINK_ASSERT(link);
return ipgre->pmtudisc;
}
static void __init ipgre_init(void)
{
rtnl_link_register_info(&ipgre_info_ops);
}
static void __exit ipgre_exit(void)
{
rtnl_link_unregister_info(&ipgre_info_ops);
}