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/* MPLS forwarding table updates using netlink over GNU/Linux system.
* Copyright (C) 2016 Cumulus Networks, Inc.
*
* This file is part of Quagga.
*
* Quagga is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* Quagga is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Quagga; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "zebra/rt.h"
#include "zebra/rt_netlink.h"
#include "zebra/zebra_mpls.h"
/*
* Install Label Forwarding entry into the kernel.
*/
int
kernel_add_lsp (zebra_lsp_t *lsp)
{
int ret;
if (!lsp || !lsp->best_nhlfe) // unexpected
return -1;
UNSET_FLAG (lsp->flags, LSP_FLAG_CHANGED);
ret = netlink_mpls_multipath (RTM_NEWROUTE, lsp);
if (!ret)
SET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
else
clear_nhlfe_installed (lsp);
return ret;
}
/*
* Update Label Forwarding entry in the kernel. This means that the Label
* forwarding entry is already installed and needs an update - either a new
* path is to be added, an installed path has changed (e.g., outgoing label)
* or an installed path (but not all paths) has to be removed.
* TODO: Performs a DEL followed by ADD now, need to change to REPLACE. Note
* that REPLACE was originally implemented for IPv4 nexthops but removed as
* it was not functioning when moving from swap to PHP as that was signaled
* through the metric field (before kernel-MPLS). This shouldn't be an issue
* any longer, so REPLACE can be reintroduced.
*/
int
kernel_upd_lsp (zebra_lsp_t *lsp)
{
int ret;
if (!lsp || !lsp->best_nhlfe) // unexpected
return -1;
UNSET_FLAG (lsp->flags, LSP_FLAG_CHANGED);
/* First issue a DEL and clear the installed flag. */
netlink_mpls_multipath (RTM_DELROUTE, lsp);
UNSET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
/* Then issue an ADD. */
ret = netlink_mpls_multipath (RTM_NEWROUTE, lsp);
if (!ret)
SET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
else
clear_nhlfe_installed (lsp);
return ret;
}
/*
* Delete Label Forwarding entry from the kernel.
*/
int
kernel_del_lsp (zebra_lsp_t *lsp)
{
if (!lsp) // unexpected
return -1;
if (CHECK_FLAG (lsp->flags, LSP_FLAG_INSTALLED))
{
netlink_mpls_multipath (RTM_DELROUTE, lsp);
UNSET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
}
return 0;
}
int
mpls_kernel_init (void)
{
struct stat st;
/*
* Check if the MPLS module is loaded in the kernel.
*/
if (stat ("/proc/sys/net/mpls", &st) != 0)
return -1;
return 0;
};
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