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9fa38ec6bb
When doing a route replace, on openbsd we were not marking the old lsp as no longer installed, while on linux we were. Move the abstraction up a layer. Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
118 lines
3.0 KiB
C
118 lines
3.0 KiB
C
/* MPLS forwarding table updates using netlink over GNU/Linux system.
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* Copyright (C) 2016 Cumulus Networks, Inc.
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*
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* This file is part of Quagga.
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*
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* Quagga is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* Quagga is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <zebra.h>
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#ifdef HAVE_NETLINK
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#include "zebra/rt.h"
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#include "zebra/rt_netlink.h"
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#include "zebra/zebra_mpls.h"
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/*
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* Install Label Forwarding entry into the kernel.
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*/
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void kernel_add_lsp(zebra_lsp_t *lsp)
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{
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int ret;
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if (!lsp || !lsp->best_nhlfe) { // unexpected
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kernel_lsp_pass_fail(lsp, SOUTHBOUND_INSTALL_FAILURE);
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return;
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}
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ret = netlink_mpls_multipath(RTM_NEWROUTE, lsp);
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kernel_lsp_pass_fail(lsp,
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(!ret) ?
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SOUTHBOUND_INSTALL_SUCCESS :
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SOUTHBOUND_INSTALL_FAILURE);
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}
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/*
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* Update Label Forwarding entry in the kernel. This means that the Label
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* forwarding entry is already installed and needs an update - either a new
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* path is to be added, an installed path has changed (e.g., outgoing label)
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* or an installed path (but not all paths) has to be removed.
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* TODO: Performs a DEL followed by ADD now, need to change to REPLACE. Note
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* that REPLACE was originally implemented for IPv4 nexthops but removed as
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* it was not functioning when moving from swap to PHP as that was signaled
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* through the metric field (before kernel-MPLS). This shouldn't be an issue
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* any longer, so REPLACE can be reintroduced.
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*/
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void kernel_upd_lsp(zebra_lsp_t *lsp)
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{
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int ret;
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if (!lsp || !lsp->best_nhlfe) { // unexpected
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kernel_lsp_pass_fail(lsp, SOUTHBOUND_INSTALL_FAILURE);
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return;
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}
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ret = netlink_mpls_multipath(RTM_NEWROUTE, lsp);
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kernel_lsp_pass_fail(lsp,
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(!ret) ?
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SOUTHBOUND_INSTALL_SUCCESS :
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SOUTHBOUND_INSTALL_FAILURE);
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}
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/*
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* Delete Label Forwarding entry from the kernel.
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*/
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void kernel_del_lsp(zebra_lsp_t *lsp)
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{
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int ret;
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if (!lsp) { // unexpected
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kernel_lsp_pass_fail(lsp,
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SOUTHBOUND_DELETE_FAILURE);
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return;
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}
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if (!CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED)) {
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kernel_lsp_pass_fail(lsp,
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SOUTHBOUND_DELETE_FAILURE);
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return;
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}
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ret = netlink_mpls_multipath(RTM_DELROUTE, lsp);
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kernel_lsp_pass_fail(lsp,
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(!ret) ?
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SOUTHBOUND_DELETE_SUCCESS :
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SOUTHBOUND_DELETE_FAILURE);
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}
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int mpls_kernel_init(void)
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{
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struct stat st;
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/*
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* Check if the MPLS module is loaded in the kernel.
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*/
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if (stat("/proc/sys/net/mpls", &st) != 0)
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return -1;
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return 0;
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};
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#endif /* HAVE_NETLINK */
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