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1 | /* MPLS forwarding table updates using netlink over GNU/Linux system. |
2 | * Copyright (C) 2016 Cumulus Networks, Inc. | |
3 | * | |
4 | * This file is part of Quagga. | |
5 | * | |
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 | |
9 | * later version. | |
10 | * | |
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. | |
15 | * | |
896014f4 DL |
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 | |
3c3877cd DL |
19 | */ |
20 | ||
be0dba35 | 21 | #include <zebra.h> |
ddfeb486 DL |
22 | |
23 | #ifdef HAVE_NETLINK | |
24 | ||
be0dba35 RW |
25 | #include "zebra/rt.h" |
26 | #include "zebra/rt_netlink.h" | |
27 | #include "zebra/zebra_mpls.h" | |
28 | ||
29 | /* | |
30 | * Install Label Forwarding entry into the kernel. | |
31 | */ | |
d62a17ae | 32 | int kernel_add_lsp(zebra_lsp_t *lsp) |
be0dba35 | 33 | { |
d62a17ae | 34 | int ret; |
be0dba35 | 35 | |
d62a17ae | 36 | if (!lsp || !lsp->best_nhlfe) // unexpected |
37 | return -1; | |
be0dba35 | 38 | |
d62a17ae | 39 | UNSET_FLAG(lsp->flags, LSP_FLAG_CHANGED); |
40 | ret = netlink_mpls_multipath(RTM_NEWROUTE, lsp); | |
41 | if (!ret) | |
42 | SET_FLAG(lsp->flags, LSP_FLAG_INSTALLED); | |
43 | else | |
44 | clear_nhlfe_installed(lsp); | |
be0dba35 | 45 | |
d62a17ae | 46 | return ret; |
be0dba35 RW |
47 | } |
48 | ||
49 | /* | |
50 | * Update Label Forwarding entry in the kernel. This means that the Label | |
51 | * forwarding entry is already installed and needs an update - either a new | |
52 | * path is to be added, an installed path has changed (e.g., outgoing label) | |
53 | * or an installed path (but not all paths) has to be removed. | |
54 | * TODO: Performs a DEL followed by ADD now, need to change to REPLACE. Note | |
55 | * that REPLACE was originally implemented for IPv4 nexthops but removed as | |
56 | * it was not functioning when moving from swap to PHP as that was signaled | |
57 | * through the metric field (before kernel-MPLS). This shouldn't be an issue | |
58 | * any longer, so REPLACE can be reintroduced. | |
59 | */ | |
d62a17ae | 60 | int kernel_upd_lsp(zebra_lsp_t *lsp) |
be0dba35 | 61 | { |
d62a17ae | 62 | int ret; |
be0dba35 | 63 | |
d62a17ae | 64 | if (!lsp || !lsp->best_nhlfe) // unexpected |
65 | return -1; | |
be0dba35 | 66 | |
d62a17ae | 67 | UNSET_FLAG(lsp->flags, LSP_FLAG_CHANGED); |
be0dba35 | 68 | |
d62a17ae | 69 | /* First issue a DEL and clear the installed flag. */ |
70 | netlink_mpls_multipath(RTM_DELROUTE, lsp); | |
71 | UNSET_FLAG(lsp->flags, LSP_FLAG_INSTALLED); | |
be0dba35 | 72 | |
d62a17ae | 73 | /* Then issue an ADD. */ |
74 | ret = netlink_mpls_multipath(RTM_NEWROUTE, lsp); | |
75 | if (!ret) | |
76 | SET_FLAG(lsp->flags, LSP_FLAG_INSTALLED); | |
77 | else | |
78 | clear_nhlfe_installed(lsp); | |
be0dba35 | 79 | |
d62a17ae | 80 | return ret; |
be0dba35 RW |
81 | } |
82 | ||
83 | /* | |
84 | * Delete Label Forwarding entry from the kernel. | |
85 | */ | |
d62a17ae | 86 | int kernel_del_lsp(zebra_lsp_t *lsp) |
be0dba35 | 87 | { |
d62a17ae | 88 | if (!lsp) // unexpected |
89 | return -1; | |
be0dba35 | 90 | |
d62a17ae | 91 | if (CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED)) { |
92 | netlink_mpls_multipath(RTM_DELROUTE, lsp); | |
93 | UNSET_FLAG(lsp->flags, LSP_FLAG_INSTALLED); | |
94 | } | |
be0dba35 | 95 | |
d62a17ae | 96 | return 0; |
be0dba35 | 97 | } |
d3e2c74a | 98 | |
d62a17ae | 99 | int mpls_kernel_init(void) |
fe6c7157 | 100 | { |
d62a17ae | 101 | struct stat st; |
fe6c7157 | 102 | |
d62a17ae | 103 | /* |
104 | * Check if the MPLS module is loaded in the kernel. | |
105 | */ | |
106 | if (stat("/proc/sys/net/mpls", &st) != 0) | |
107 | return -1; | |
fe6c7157 | 108 | |
d62a17ae | 109 | return 0; |
fe6c7157 | 110 | }; |
ddfeb486 DL |
111 | |
112 | #endif /* HAVE_NETLINK */ |