zebra: add pseudowire manager

Base framework for supporting MPLS pseudowires in FRR.

A consistent zserv interface is provided so that any client daemon
(e.g. ldpd, bgpd) can install/uninstall pseudowires in a standard
way. Static pseudowires can also be implemented by using the same
interface.

When zebra receives a request to install a pseudowire and the installation
in the kernel or hardware fails, a notification is sent back to the
client daemon and a new install attempt is made every 60 seconds (until
it succeeds).

Support for external dataplanes is provided by the use of hooks to
install/uninstall pseudowires.

Signed-off-by: ßingen <bingen@voltanet.io>
Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/zebra/debug.c b/zebra/debug.c
index a42d5aa3ef..6f59dc0ac2 100644
--- a/zebra/debug.c
+++ b/zebra/debug.c
@@ -32,6 +32,7 @@ unsigned long zebra_debug_rib;
 unsigned long zebra_debug_fpm;
 unsigned long zebra_debug_nht;
 unsigned long zebra_debug_mpls;
+unsigned long zebra_debug_pw;
 
 DEFUN (show_debugging_zebra,
        show_debugging_zebra_cmd,
@@ -85,6 +86,8 @@ DEFUN (show_debugging_zebra,
     vty_out (vty, "  Zebra next-hop tracking debugging is on%s", VTY_NEWLINE);
   if (IS_ZEBRA_DEBUG_MPLS)
     vty_out (vty, "  Zebra MPLS debugging is on%s", VTY_NEWLINE);
+  if (IS_ZEBRA_DEBUG_PW)
+    vty_out (vty, "  Zebra pseudowire debugging is on%s", VTY_NEWLINE);
 
   return CMD_SUCCESS;
 }
@@ -122,6 +125,21 @@ DEFUN (debug_zebra_mpls,
   return CMD_WARNING;
 }
 
+DEFUN (debug_zebra_pw,
+       debug_zebra_pw_cmd,
+       "[no] debug zebra pseudowires",
+       "Negate a command or set its defaults\n"
+       DEBUG_STR
+       "Zebra configuration\n"
+       "Debug option set for zebra pseudowires\n")
+{
+  if (strmatch (argv[0]->text, "no"))
+    UNSET_FLAG (zebra_debug_pw, ZEBRA_DEBUG_PW);
+  else
+    SET_FLAG (zebra_debug_pw, ZEBRA_DEBUG_PW);
+  return CMD_WARNING;
+}
+
 DEFUN (debug_zebra_packet,
        debug_zebra_packet_cmd,
        "debug zebra packet [<recv|send>] [detail]",
@@ -410,6 +428,11 @@ config_write_debug (struct vty *vty)
       vty_out (vty, "debug zebra mpls%s", VTY_NEWLINE);
       write++;
     }
+  if (IS_ZEBRA_DEBUG_PW)
+    {
+      vty_out (vty, "debug zebra pseudowires%s", VTY_NEWLINE);
+      write++;
+    }
   return write;
 }
 
@@ -422,6 +445,7 @@ zebra_debug_init (void)
   zebra_debug_rib = 0;
   zebra_debug_fpm = 0;
   zebra_debug_mpls = 0;
+  zebra_debug_pw = 0;
 
   install_node (&debug_node, config_write_debug);
 
@@ -430,6 +454,7 @@ zebra_debug_init (void)
   install_element (ENABLE_NODE, &debug_zebra_events_cmd);
   install_element (ENABLE_NODE, &debug_zebra_nht_cmd);
   install_element (ENABLE_NODE, &debug_zebra_mpls_cmd);
+  install_element (ENABLE_NODE, &debug_zebra_pw_cmd);
   install_element (ENABLE_NODE, &debug_zebra_packet_cmd);
   install_element (ENABLE_NODE, &debug_zebra_kernel_cmd);
   install_element (ENABLE_NODE, &debug_zebra_kernel_msgdump_cmd);
@@ -449,6 +474,7 @@ zebra_debug_init (void)
   install_element (CONFIG_NODE, &debug_zebra_events_cmd);
   install_element (CONFIG_NODE, &debug_zebra_nht_cmd);
   install_element (CONFIG_NODE, &debug_zebra_mpls_cmd);
+  install_element (CONFIG_NODE, &debug_zebra_pw_cmd);
   install_element (CONFIG_NODE, &debug_zebra_packet_cmd);
   install_element (CONFIG_NODE, &debug_zebra_kernel_cmd);
   install_element (CONFIG_NODE, &debug_zebra_kernel_msgdump_cmd);