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/* SPDX-License-Identifier: LGPL-2.1-only */
/*
* Copyright (c) 2015 Cumulus Networks. All rights reserved.
* Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
*/
/**
* @ingroup link
* @defgroup vrf VRF
* Virtual Routing and Forwarding link module
*
* @details
* \b Link Type Name: "vrf"
*
* @route_doc{link_vrf, VRF 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 <netlink/route/link/vrf.h>
#include <linux/if_link.h>
#include <linux-private/linux/rtnetlink.h>
#define VRF_TABLE_ID_MAX RT_TABLE_MAX
/** @cond SKIP */
#define VRF_HAS_TABLE_ID (1<<0)
struct vrf_info {
uint32_t table_id;
uint32_t vi_mask;
};
/** @endcond */
static struct nla_policy vrf_policy[IFLA_VRF_MAX + 1] = {
[IFLA_VRF_TABLE] = { .type = NLA_U32 },
};
static int vrf_alloc(struct rtnl_link *link)
{
struct vrf_info *vi;
if (link->l_info) {
memset(link->l_info, 0, sizeof (*vi));
return 0;
}
if ((vi = calloc(1, sizeof(*vi))) == NULL)
return -NLE_NOMEM;
link->l_info = vi;
return 0;
}
static int vrf_parse(struct rtnl_link *link, struct nlattr *data,
struct nlattr *xstats)
{
struct nlattr *tb[IFLA_VRF_MAX+1];
struct vrf_info *vi;
int err;
NL_DBG(3, "Parsing VRF link info");
if ((err = nla_parse_nested(tb, IFLA_VRF_MAX, data, vrf_policy)) < 0)
goto errout;
if ((err = vrf_alloc(link)) < 0)
goto errout;
vi = link->l_info;
if (tb[IFLA_VRF_TABLE]) {
vi->table_id = nla_get_u32(tb[IFLA_VRF_TABLE]);
vi->vi_mask |= VRF_HAS_TABLE_ID;
}
err = 0;
errout:
return err;
}
static void vrf_free(struct rtnl_link *link)
{
free(link->l_info);
link->l_info = NULL;
}
static int vrf_clone(struct rtnl_link *dst, struct rtnl_link *src)
{
struct vrf_info *vdst, *vsrc = src->l_info;
int err;
dst->l_info = NULL;
if ((err = rtnl_link_set_type(dst, "vrf")) < 0)
return err;
vdst = dst->l_info;
BUG_ON(!vdst || !vsrc);
memcpy(vdst, vsrc, sizeof(struct vrf_info));
return 0;
}
static int vrf_put_attrs(struct nl_msg *msg, struct rtnl_link *link)
{
struct vrf_info *vi = link->l_info;
struct nlattr *data;
if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
return -NLE_NOMEM;
if (vi->vi_mask & VRF_HAS_TABLE_ID) {
NLA_PUT_U32(msg, IFLA_VRF_TABLE, vi->table_id);
}
nla_nest_end(msg, data);
nla_put_failure:
return 0;
}
static void vrf_dump(struct rtnl_link *link, struct nl_dump_params *p)
{
struct vrf_info *vi = link->l_info;
if (vi->vi_mask & VRF_HAS_TABLE_ID) {
nl_dump(p, "table-id %u", vi->table_id);
}
}
static struct rtnl_link_info_ops vrf_info_ops = {
.io_name = "vrf",
.io_alloc = vrf_alloc,
.io_parse = vrf_parse,
.io_dump = {
[NL_DUMP_LINE] = vrf_dump,
[NL_DUMP_DETAILS] = vrf_dump,
},
.io_clone = vrf_clone,
.io_put_attrs = vrf_put_attrs,
.io_free = vrf_free,
};
/** @cond SKIP */
#define IS_VRF_LINK_ASSERT(link) \
if ((link)->l_info_ops != &vrf_info_ops) { \
APPBUG("Link is not a VRF link. set type \"vrf\" first."); \
return -NLE_OPNOTSUPP; \
}
/** @endcond */
/**
* @name VRF Object
* @{
*/
/**
* Allocate link object of type VRF
*
* @return Allocated link object or NULL.
*/
struct rtnl_link *rtnl_link_vrf_alloc(void)
{
struct rtnl_link *link;
if (!(link = rtnl_link_alloc()))
return NULL;
if (rtnl_link_set_type(link, "vrf") < 0) {
rtnl_link_put(link);
return NULL;
}
return link;
}
/**
* Check if link is a VRF link
* @arg link Link object
*
* @return True if link is a VRF link, otherwise false is returned.
*/
int rtnl_link_is_vrf(struct rtnl_link *link)
{
return link->l_info_ops && !strcmp(link->l_info_ops->io_name, "vrf");
}
/**
* Get VRF table id
* @arg link Link object
* @arg id Pointer to store table identifier
*
* @return 0 on success or a negative error code
*/
int rtnl_link_vrf_get_tableid(struct rtnl_link *link, uint32_t *id)
{
struct vrf_info *vi = link->l_info;
IS_VRF_LINK_ASSERT(link);
if(!id)
return -NLE_INVAL;
if (vi->vi_mask & VRF_HAS_TABLE_ID)
*id = vi->table_id;
else
return -NLE_AGAIN;
return 0;
}
/**
* Set VRF table id
* @arg link Link object
* @arg id Table identifier associated with VRF link
*
* @return 0 on success or a negative error code
*/
int rtnl_link_vrf_set_tableid(struct rtnl_link *link, uint32_t id)
{
struct vrf_info *vi = link->l_info;
IS_VRF_LINK_ASSERT(link);
_NL_STATIC_ASSERT(VRF_TABLE_ID_MAX == UINT32_MAX);
vi->table_id = id;
vi->vi_mask |= VRF_HAS_TABLE_ID;
return 0;
}
/** @} */
static void __init vrf_init(void)
{
rtnl_link_register_info(&vrf_info_ops);
}
static void __exit vrf_exit(void)
{
rtnl_link_unregister_info(&vrf_info_ops);
}
/** @} */
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