zebra/zebra_mpls_netlink.c

   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  *
  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
  19  */
  20
  21 #include <zebra.h>
  22
  23 #ifdef HAVE_NETLINK
  24
  25 #include "zebra/debug.h"
  26 #include "zebra/rt.h"
  27 #include "zebra/rt_netlink.h"
  28 #include "zebra/zebra_mpls.h"
  29
  30 /*
  31  * LSP forwarding update using dataplane context information.
  32  */
  33 enum zebra_dplane_result kernel_lsp_update(struct zebra_dplane_ctx *ctx)
  34 {
  35         int cmd, ret = -1;
  36
  37         /* Call to netlink layer based on type of update */
  38         if (dplane_ctx_get_op(ctx) == DPLANE_OP_LSP_DELETE) {
  39                 cmd = RTM_DELROUTE;
  40         } else if (dplane_ctx_get_op(ctx) == DPLANE_OP_LSP_INSTALL ||
  41                    dplane_ctx_get_op(ctx) == DPLANE_OP_LSP_UPDATE) {
  42
  43                 /* Validate */
  44                 if (dplane_ctx_get_best_nhlfe(ctx) == NULL) {
  45                         if (IS_ZEBRA_DEBUG_KERNEL || IS_ZEBRA_DEBUG_MPLS)
  46                                 zlog_debug("LSP in-label %u: update fails, no best NHLFE",
  47                                            dplane_ctx_get_in_label(ctx));
  48                         goto done;
  49                 }
  50
  51                 cmd = RTM_NEWROUTE;
  52         } else
  53                 /* Invalid op? */
  54                 goto done;
  55
  56         ret = netlink_mpls_multipath(cmd, ctx);
  57
  58 done:
  59
  60         return (ret == 0 ?
  61                 ZEBRA_DPLANE_REQUEST_SUCCESS : ZEBRA_DPLANE_REQUEST_FAILURE);
  62 }
  63
  64 /*
  65  * Pseudowire update api - not supported by netlink as of 12/18,
  66  * but note that the default has been to report 'success' for pw updates
  67  * on unsupported platforms.
  68  */
  69 enum zebra_dplane_result kernel_pw_update(struct zebra_dplane_ctx *ctx)
  70 {
  71         return ZEBRA_DPLANE_REQUEST_SUCCESS;
  72 }
  73
  74 int mpls_kernel_init(void)
  75 {
  76         struct stat st;
  77
  78         /*
  79          * Check if the MPLS module is loaded in the kernel.
  80          */
  81         if (stat("/proc/sys/net/mpls", &st) != 0)
  82                 return -1;
  83
  84         return 0;
  85 };
  86
  87 #endif /* HAVE_NETLINK */