mpls: add null driver

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

1 files changed, 78 insertions, 0 deletions

diff --git a/zebra/zebra_mpls_netlink.c b/zebra/zebra_mpls_netlink.c
new file mode 100644
index 000000000..f5678ede3
--- /dev/null
+++ b/zebra/zebra_mpls_netlink.c
@@ -0,0 +1,78 @@
+#include <zebra.h>
+#include "zebra/rt.h"
+#include "zebra/rt_netlink.h"
+#include "zebra/zebra_mpls.h"
+
+/*
+ * Install Label Forwarding entry into the kernel.
+ */
+int
+kernel_add_lsp (zebra_lsp_t *lsp)
+{
+  int ret;
+
+  if (!lsp || !lsp->best_nhlfe) // unexpected
+    return -1;
+
+  UNSET_FLAG (lsp->flags, LSP_FLAG_CHANGED);
+  ret = netlink_mpls_multipath (RTM_NEWROUTE, lsp);
+  if (!ret)
+    SET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
+  else
+    clear_nhlfe_installed (lsp);
+
+  return ret;
+}
+
+/*
+ * Update Label Forwarding entry in the kernel. This means that the Label
+ * forwarding entry is already installed and needs an update - either a new
+ * path is to be added, an installed path has changed (e.g., outgoing label)
+ * or an installed path (but not all paths) has to be removed.
+ * TODO: Performs a DEL followed by ADD now, need to change to REPLACE. Note
+ * that REPLACE was originally implemented for IPv4 nexthops but removed as
+ * it was not functioning when moving from swap to PHP as that was signaled
+ * through the metric field (before kernel-MPLS). This shouldn't be an issue
+ * any longer, so REPLACE can be reintroduced.
+ */
+int
+kernel_upd_lsp (zebra_lsp_t *lsp)
+{
+  int ret;
+
+  if (!lsp || !lsp->best_nhlfe) // unexpected
+    return -1;
+
+  UNSET_FLAG (lsp->flags, LSP_FLAG_CHANGED);
+
+  /* First issue a DEL and clear the installed flag. */
+  netlink_mpls_multipath (RTM_DELROUTE, lsp);
+  UNSET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
+
+  /* Then issue an ADD. */
+  ret = netlink_mpls_multipath (RTM_NEWROUTE, lsp);
+  if (!ret)
+    SET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
+  else
+    clear_nhlfe_installed (lsp);
+
+  return ret;
+}
+
+/*
+ * Delete Label Forwarding entry from the kernel.
+ */
+int
+kernel_del_lsp (zebra_lsp_t *lsp)
+{
+  if (!lsp) // unexpected
+    return -1;
+
+  if (CHECK_FLAG (lsp->flags, LSP_FLAG_INSTALLED))
+    {
+      netlink_mpls_multipath (RTM_DELROUTE, lsp);
+      UNSET_FLAG (lsp->flags, LSP_FLAG_INSTALLED);
+    }
+
+  return 0;
+}