zebra/zebra_mpls_netlink.c

   1 #include <zebra.h>
   2 #include "zebra/rt.h"
   3 #include "zebra/rt_netlink.h"
   4 #include "zebra/zebra_mpls.h"
   5
   6 /*
   7  * Install Label Forwarding entry into the kernel.
   8  */
   9 int
  10 kernel_add_lsp (zebra_lsp_t *lsp)
  11 {
  12   int ret;
  13
  14   if (!lsp || !lsp->best_nhlfe) // unexpected
  15     return -1;
  16
  17   UNSET_FLAG (lsp->flags, LSP_FLAG_CHANGED);
  18   ret = netlink_mpls_multipath (RTM_NEWROUTE, lsp);
  19   if (!ret)
  20     SET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
  21   else
  22     clear_nhlfe_installed (lsp);
  23
  24   return ret;
  25 }
  26
  27 /*
  28  * Update Label Forwarding entry in the kernel. This means that the Label
  29  * forwarding entry is already installed and needs an update - either a new
  30  * path is to be added, an installed path has changed (e.g., outgoing label)
  31  * or an installed path (but not all paths) has to be removed.
  32  * TODO: Performs a DEL followed by ADD now, need to change to REPLACE. Note
  33  * that REPLACE was originally implemented for IPv4 nexthops but removed as
  34  * it was not functioning when moving from swap to PHP as that was signaled
  35  * through the metric field (before kernel-MPLS). This shouldn't be an issue
  36  * any longer, so REPLACE can be reintroduced.
  37  */
  38 int
  39 kernel_upd_lsp (zebra_lsp_t *lsp)
  40 {
  41   int ret;
  42
  43   if (!lsp || !lsp->best_nhlfe) // unexpected
  44     return -1;
  45
  46   UNSET_FLAG (lsp->flags, LSP_FLAG_CHANGED);
  47
  48   /* First issue a DEL and clear the installed flag. */
  49   netlink_mpls_multipath (RTM_DELROUTE, lsp);
  50   UNSET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
  51
  52   /* Then issue an ADD. */
  53   ret = netlink_mpls_multipath (RTM_NEWROUTE, lsp);
  54   if (!ret)
  55     SET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
  56   else
  57     clear_nhlfe_installed (lsp);
  58
  59   return ret;
  60 }
  61
  62 /*
  63  * Delete Label Forwarding entry from the kernel.
  64  */
  65 int
  66 kernel_del_lsp (zebra_lsp_t *lsp)
  67 {
  68   if (!lsp) // unexpected
  69     return -1;
  70
  71   if (CHECK_FLAG (lsp->flags, LSP_FLAG_INSTALLED))
  72     {
  73       netlink_mpls_multipath (RTM_DELROUTE, lsp);
  74       UNSET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
  75     }
  76
  77   return 0;
  78 }