Line data    Source code

       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             : #include "zebra/kernel_netlink.h"
      30             : 
      31           0 : ssize_t netlink_lsp_msg_encoder(struct zebra_dplane_ctx *ctx, void *buf,
      32             :                                 size_t buflen)
      33             : {
      34           0 :         int cmd;
      35             : 
      36             :         /* Call to netlink layer based on type of update */
      37           0 :         if (dplane_ctx_get_op(ctx) == DPLANE_OP_LSP_DELETE) {
      38             :                 cmd = RTM_DELROUTE;
      39           0 :         } else if (dplane_ctx_get_op(ctx) == DPLANE_OP_LSP_INSTALL ||
      40           0 :                    dplane_ctx_get_op(ctx) == DPLANE_OP_LSP_UPDATE) {
      41             : 
      42             :                 /* Validate */
      43           0 :                 if (dplane_ctx_get_best_nhlfe(ctx) == NULL) {
      44           0 :                         if (IS_ZEBRA_DEBUG_KERNEL || IS_ZEBRA_DEBUG_MPLS)
      45           0 :                                 zlog_debug("LSP in-label %u: update fails, no best NHLFE",
      46             :                                            dplane_ctx_get_in_label(ctx));
      47           0 :                         return -1;
      48             :                 }
      49             : 
      50             :                 cmd = RTM_NEWROUTE;
      51             :         } else
      52             :                 /* Invalid op? */
      53             :                 return -1;
      54             : 
      55           0 :         return netlink_mpls_multipath_msg_encode(cmd, ctx, buf, buflen);
      56             : }
      57             : 
      58           0 : enum netlink_msg_status netlink_put_lsp_update_msg(struct nl_batch *bth,
      59             :                                                    struct zebra_dplane_ctx *ctx)
      60             : {
      61           0 :         return netlink_batch_add_msg(bth, ctx, netlink_lsp_msg_encoder, false);
      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           0 : enum netlink_msg_status netlink_put_pw_update_msg(struct nl_batch *bth,
      70             :                                                   struct zebra_dplane_ctx *ctx)
      71             : {
      72           0 :         return FRR_NETLINK_SUCCESS;
      73             : }
      74             : 
      75          93 : int mpls_kernel_init(void)
      76             : {
      77          93 :         struct stat st;
      78             : 
      79             :         /*
      80             :          * Check if the MPLS module is loaded in the kernel.
      81             :          */
      82          93 :         if (stat("/proc/sys/net/mpls", &st) != 0)
      83          93 :                 return -1;
      84             : 
      85             :         return 0;
      86             : };
      87             : 
      88             : #endif /* HAVE_NETLINK */