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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/debug.h"
#include "zebra/rt.h"
#include "zebra/rt_netlink.h"
#include "zebra/zebra_mpls.h"
/*
* Install Label Forwarding entry into the kernel.
*/
enum zebra_dplane_result kernel_add_lsp(zebra_lsp_t *lsp)
{
int ret;
if (!lsp || !lsp->best_nhlfe) { // unexpected
kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_INSTALL_FAILURE);
return ZEBRA_DPLANE_REQUEST_FAILURE;
}
ret = netlink_mpls_multipath(RTM_NEWROUTE, lsp);
kernel_lsp_pass_fail(lsp,
(!ret) ? ZEBRA_DPLANE_INSTALL_SUCCESS
: ZEBRA_DPLANE_INSTALL_FAILURE);
return ZEBRA_DPLANE_REQUEST_SUCCESS;
}
/*
* 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. This performs
* a REPLACE operation, internally.
*/
enum zebra_dplane_result kernel_upd_lsp(zebra_lsp_t *lsp)
{
int ret;
if (!lsp || !lsp->best_nhlfe) { // unexpected
kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_INSTALL_FAILURE);
return ZEBRA_DPLANE_REQUEST_FAILURE;
}
ret = netlink_mpls_multipath(RTM_NEWROUTE, lsp);
kernel_lsp_pass_fail(lsp,
(!ret) ? ZEBRA_DPLANE_INSTALL_SUCCESS
: ZEBRA_DPLANE_INSTALL_FAILURE);
return ZEBRA_DPLANE_REQUEST_SUCCESS;
}
/*
* Delete Label Forwarding entry from the kernel.
*/
enum zebra_dplane_result kernel_del_lsp(zebra_lsp_t *lsp)
{
int ret;
if (!lsp) { // unexpected
kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_DELETE_FAILURE);
return ZEBRA_DPLANE_REQUEST_FAILURE;
}
if (!CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED)) {
kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_DELETE_FAILURE);
return ZEBRA_DPLANE_REQUEST_FAILURE;
}
ret = netlink_mpls_multipath(RTM_DELROUTE, lsp);
kernel_lsp_pass_fail(lsp,
(!ret) ? ZEBRA_DPLANE_DELETE_SUCCESS
: ZEBRA_DPLANE_DELETE_FAILURE);
return ZEBRA_DPLANE_REQUEST_SUCCESS;
}
/*
* LSP forwarding update using dataplane context information.
*/
enum zebra_dplane_result kernel_lsp_update(struct zebra_dplane_ctx *ctx)
{
int cmd, ret = -1;
/* Call to netlink layer based on type of update */
if (dplane_ctx_get_op(ctx) == DPLANE_OP_LSP_DELETE) {
cmd = RTM_DELROUTE;
} else if (dplane_ctx_get_op(ctx) == DPLANE_OP_LSP_INSTALL ||
dplane_ctx_get_op(ctx) == DPLANE_OP_LSP_UPDATE) {
/* Validate */
if (dplane_ctx_get_best_nhlfe(ctx) == NULL) {
if (IS_ZEBRA_DEBUG_KERNEL || IS_ZEBRA_DEBUG_MPLS)
zlog_debug("LSP in-label %u: update fails, no best NHLFE",
dplane_ctx_get_in_label(ctx));
goto done;
}
cmd = RTM_NEWROUTE;
} else
/* Invalid op? */
goto done;
ret = netlink_mpls_multipath_ctx(cmd, ctx);
done:
return (ret == 0 ?
ZEBRA_DPLANE_REQUEST_SUCCESS : ZEBRA_DPLANE_REQUEST_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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