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3c3877cd DL |
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 | */ | |
ea1c14f6 | 32 | enum zebra_dplane_result kernel_add_lsp(zebra_lsp_t *lsp) |
be0dba35 | 33 | { |
d62a17ae | 34 | int ret; |
be0dba35 | 35 | |
4a83e7a0 | 36 | if (!lsp || !lsp->best_nhlfe) { // unexpected |
ea1c14f6 MS |
37 | kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_INSTALL_FAILURE); |
38 | return ZEBRA_DPLANE_REQUEST_FAILURE; | |
4a83e7a0 | 39 | } |
be0dba35 | 40 | |
d62a17ae | 41 | ret = netlink_mpls_multipath(RTM_NEWROUTE, lsp); |
be0dba35 | 42 | |
4a83e7a0 | 43 | kernel_lsp_pass_fail(lsp, |
ea1c14f6 MS |
44 | (!ret) ? ZEBRA_DPLANE_INSTALL_SUCCESS |
45 | : ZEBRA_DPLANE_INSTALL_FAILURE); | |
7c5d0e18 | 46 | |
ea1c14f6 | 47 | return ZEBRA_DPLANE_REQUEST_SUCCESS; |
be0dba35 RW |
48 | } |
49 | ||
50 | /* | |
51 | * Update Label Forwarding entry in the kernel. This means that the Label | |
52 | * forwarding entry is already installed and needs an update - either a new | |
53 | * path is to be added, an installed path has changed (e.g., outgoing label) | |
54 | * or an installed path (but not all paths) has to be removed. | |
55 | * TODO: Performs a DEL followed by ADD now, need to change to REPLACE. Note | |
56 | * that REPLACE was originally implemented for IPv4 nexthops but removed as | |
57 | * it was not functioning when moving from swap to PHP as that was signaled | |
58 | * through the metric field (before kernel-MPLS). This shouldn't be an issue | |
59 | * any longer, so REPLACE can be reintroduced. | |
60 | */ | |
ea1c14f6 | 61 | enum zebra_dplane_result kernel_upd_lsp(zebra_lsp_t *lsp) |
be0dba35 | 62 | { |
d62a17ae | 63 | int ret; |
be0dba35 | 64 | |
4a83e7a0 | 65 | if (!lsp || !lsp->best_nhlfe) { // unexpected |
ea1c14f6 MS |
66 | kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_INSTALL_FAILURE); |
67 | return ZEBRA_DPLANE_REQUEST_FAILURE; | |
4a83e7a0 | 68 | } |
be0dba35 | 69 | |
d62a17ae | 70 | ret = netlink_mpls_multipath(RTM_NEWROUTE, lsp); |
be0dba35 | 71 | |
4a83e7a0 | 72 | kernel_lsp_pass_fail(lsp, |
ea1c14f6 MS |
73 | (!ret) ? ZEBRA_DPLANE_INSTALL_SUCCESS |
74 | : ZEBRA_DPLANE_INSTALL_FAILURE); | |
7c5d0e18 | 75 | |
ea1c14f6 | 76 | return ZEBRA_DPLANE_REQUEST_SUCCESS; |
be0dba35 RW |
77 | } |
78 | ||
79 | /* | |
80 | * Delete Label Forwarding entry from the kernel. | |
81 | */ | |
ea1c14f6 | 82 | enum zebra_dplane_result kernel_del_lsp(zebra_lsp_t *lsp) |
be0dba35 | 83 | { |
2b63430c DS |
84 | int ret; |
85 | ||
4a83e7a0 | 86 | if (!lsp) { // unexpected |
ea1c14f6 MS |
87 | kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_DELETE_FAILURE); |
88 | return ZEBRA_DPLANE_REQUEST_FAILURE; | |
4a83e7a0 | 89 | } |
be0dba35 | 90 | |
4a83e7a0 | 91 | if (!CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED)) { |
ea1c14f6 MS |
92 | kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_DELETE_FAILURE); |
93 | return ZEBRA_DPLANE_REQUEST_FAILURE; | |
4a83e7a0 | 94 | } |
be0dba35 | 95 | |
2b63430c DS |
96 | ret = netlink_mpls_multipath(RTM_DELROUTE, lsp); |
97 | ||
4a83e7a0 | 98 | kernel_lsp_pass_fail(lsp, |
ea1c14f6 MS |
99 | (!ret) ? ZEBRA_DPLANE_DELETE_SUCCESS |
100 | : ZEBRA_DPLANE_DELETE_FAILURE); | |
7c5d0e18 | 101 | |
ea1c14f6 | 102 | return ZEBRA_DPLANE_REQUEST_SUCCESS; |
be0dba35 | 103 | } |
d3e2c74a | 104 | |
d62a17ae | 105 | int mpls_kernel_init(void) |
fe6c7157 | 106 | { |
d62a17ae | 107 | struct stat st; |
fe6c7157 | 108 | |
d62a17ae | 109 | /* |
110 | * Check if the MPLS module is loaded in the kernel. | |
111 | */ | |
112 | if (stat("/proc/sys/net/mpls", &st) != 0) | |
113 | return -1; | |
fe6c7157 | 114 | |
d62a17ae | 115 | return 0; |
fe6c7157 | 116 | }; |
ddfeb486 DL |
117 | |
118 | #endif /* HAVE_NETLINK */ |