]>
git.proxmox.com Git - mirror_frr.git/blob - zebra/zebra_mpls_netlink.c
1 /* MPLS forwarding table updates using netlink over GNU/Linux system.
2 * Copyright (C) 2016 Cumulus Networks, Inc.
4 * This file is part of Quagga.
6 * Quagga is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2, or (at your option) any
11 * Quagga is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; see the file COPYING; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "zebra/rt_netlink.h"
24 #include "zebra/zebra_mpls.h"
27 * Install Label Forwarding entry into the kernel.
30 kernel_add_lsp (zebra_lsp_t
*lsp
)
34 if (!lsp
|| !lsp
->best_nhlfe
) // unexpected
37 UNSET_FLAG (lsp
->flags
, LSP_FLAG_CHANGED
);
38 ret
= netlink_mpls_multipath (RTM_NEWROUTE
, lsp
);
40 SET_FLAG (lsp
->flags
, LSP_FLAG_INSTALLED
);
42 clear_nhlfe_installed (lsp
);
48 * Update Label Forwarding entry in the kernel. This means that the Label
49 * forwarding entry is already installed and needs an update - either a new
50 * path is to be added, an installed path has changed (e.g., outgoing label)
51 * or an installed path (but not all paths) has to be removed.
52 * TODO: Performs a DEL followed by ADD now, need to change to REPLACE. Note
53 * that REPLACE was originally implemented for IPv4 nexthops but removed as
54 * it was not functioning when moving from swap to PHP as that was signaled
55 * through the metric field (before kernel-MPLS). This shouldn't be an issue
56 * any longer, so REPLACE can be reintroduced.
59 kernel_upd_lsp (zebra_lsp_t
*lsp
)
63 if (!lsp
|| !lsp
->best_nhlfe
) // unexpected
66 UNSET_FLAG (lsp
->flags
, LSP_FLAG_CHANGED
);
68 /* First issue a DEL and clear the installed flag. */
69 netlink_mpls_multipath (RTM_DELROUTE
, lsp
);
70 UNSET_FLAG (lsp
->flags
, LSP_FLAG_INSTALLED
);
72 /* Then issue an ADD. */
73 ret
= netlink_mpls_multipath (RTM_NEWROUTE
, lsp
);
75 SET_FLAG (lsp
->flags
, LSP_FLAG_INSTALLED
);
77 clear_nhlfe_installed (lsp
);
83 * Delete Label Forwarding entry from the kernel.
86 kernel_del_lsp (zebra_lsp_t
*lsp
)
88 if (!lsp
) // unexpected
91 if (CHECK_FLAG (lsp
->flags
, LSP_FLAG_INSTALLED
))
93 netlink_mpls_multipath (RTM_DELROUTE
, lsp
);
94 UNSET_FLAG (lsp
->flags
, LSP_FLAG_INSTALLED
);
101 mpls_kernel_init (void)
106 * Check if the MPLS module is loaded in the kernel.
108 if (stat ("/proc/sys/net/mpls", &st
) != 0)