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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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#ifdef HAVE_NETLINK
#include "zebra/rt.h"
#include "zebra/rt_netlink.h"
#include "zebra/zebra_mpls.h"
/*
* Install Label Forwarding entry into the kernel.
*/
void kernel_add_lsp(zebra_lsp_t *lsp)
{
int ret;
if (!lsp || !lsp->best_nhlfe) { // unexpected
kernel_lsp_pass_fail(lsp, SOUTHBOUND_INSTALL_FAILURE);
return;
}
ret = netlink_mpls_multipath(RTM_NEWROUTE, lsp);
kernel_lsp_pass_fail(lsp,
(!ret) ?
SOUTHBOUND_INSTALL_SUCCESS :
SOUTHBOUND_INSTALL_FAILURE);
}
/*
* 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.
*/
void kernel_upd_lsp(zebra_lsp_t *lsp)
{
int ret;
zebra_nhlfe_t *nhlfe;
struct nexthop *nexthop;
if (!lsp || !lsp->best_nhlfe) { // unexpected
kernel_lsp_pass_fail(lsp, SOUTHBOUND_INSTALL_FAILURE);
return;
}
/* Any NHLFE that was installed but is not selected now needs to
* have its flags updated.
*/
for (nhlfe = lsp->nhlfe_list; nhlfe; nhlfe = nhlfe->next) {
nexthop = nhlfe->nexthop;
if (!nexthop)
continue;
if (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_INSTALLED) &&
!CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED)) {
UNSET_FLAG(nhlfe->flags, NHLFE_FLAG_INSTALLED);
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
}
}
ret = netlink_mpls_multipath(RTM_NEWROUTE, lsp);
kernel_lsp_pass_fail(lsp,
(!ret) ?
SOUTHBOUND_INSTALL_SUCCESS :
SOUTHBOUND_INSTALL_FAILURE);
}
/*
* Delete Label Forwarding entry from the kernel.
*/
void kernel_del_lsp(zebra_lsp_t *lsp)
{
int ret;
if (!lsp) { // unexpected
kernel_lsp_pass_fail(lsp,
SOUTHBOUND_DELETE_FAILURE);
return;
}
if (!CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED)) {
kernel_lsp_pass_fail(lsp,
SOUTHBOUND_DELETE_FAILURE);
return;
}
ret = netlink_mpls_multipath(RTM_DELROUTE, lsp);
kernel_lsp_pass_fail(lsp,
(!ret) ?
SOUTHBOUND_DELETE_SUCCESS :
SOUTHBOUND_DELETE_FAILURE);
}
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;
};
#endif /* HAVE_NETLINK */
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