1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/* 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>
#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;
};
|
