From e5468d16855600aeb8172e29936789c46ea58da0 Mon Sep 17 00:00:00 2001
From: Trisha Biswas <tbiswas@fastly.com>
Date: Mon, 17 May 2021 17:50:04 +0200
Subject: Filter: Add MPLS label route attribute

Add support to set or read outgoing MPLS labels using filters. Currently
this supports the addition of one label per route for the first next hop.

Minor changes by committer.
---
 filter/config.Y |  3 ++-
 filter/data.h   |  1 +
 filter/f-inst.c | 19 +++++++++++++++++++
 3 files changed, 22 insertions(+), 1 deletion(-)

(limited to 'filter')

diff --git a/filter/config.Y b/filter/config.Y
index 5cd52e40..7820e719 100644
--- a/filter/config.Y
+++ b/filter/config.Y
@@ -278,7 +278,7 @@ CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN,
 	SET, STRING, BGPMASK, BGPPATH, CLIST, ECLIST, LCLIST,
 	IF, THEN, ELSE, CASE,
 	TRUE, FALSE, RT, RO, UNKNOWN, GENERIC,
-	FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, DEST, IFNAME, IFINDEX, WEIGHT,
+	FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, DEST, IFNAME, IFINDEX, WEIGHT, GW_MPLS,
 	PREFERENCE,
 	ROA_CHECK, ASN, SRC, DST,
 	IS_V4, IS_V6,
@@ -751,6 +751,7 @@ static_attr:
  | IFNAME  { $$ = f_new_static_attr(T_STRING,     SA_IFNAME,	0); }
  | IFINDEX { $$ = f_new_static_attr(T_INT,        SA_IFINDEX,	1); }
  | WEIGHT  { $$ = f_new_static_attr(T_INT,        SA_WEIGHT,	0); }
+ | GW_MPLS { $$ = f_new_static_attr(T_INT,        SA_GW_MPLS,	0); }
  ;
 
 term:
diff --git a/filter/data.h b/filter/data.h
index 61cdb43e..d296776d 100644
--- a/filter/data.h
+++ b/filter/data.h
@@ -100,6 +100,7 @@ enum f_sa_code {
   SA_IFNAME,
   SA_IFINDEX,
   SA_WEIGHT,
+  SA_GW_MPLS,
 } PACKED;
 
 /* Static attribute definition (members of struct rta) */
diff --git a/filter/f-inst.c b/filter/f-inst.c
index 1378fe4a..b876a937 100644
--- a/filter/f-inst.c
+++ b/filter/f-inst.c
@@ -533,6 +533,7 @@
       case SA_IFNAME:	RESULT(sa.f_type, s, rta->nh.iface ? rta->nh.iface->name : ""); break;
       case SA_IFINDEX:	RESULT(sa.f_type, i, rta->nh.iface ? rta->nh.iface->index : 0); break;
       case SA_WEIGHT:	RESULT(sa.f_type, i, rta->nh.weight + 1); break;
+      case SA_GW_MPLS:	RESULT(sa.f_type, i, rta->nh.labels ? rta->nh.label[0] : MPLS_NULL); break;
 
       default:
 	bug("Invalid static attribute access (%u/%u)", sa.f_type, sa.sa_code);
@@ -569,6 +570,7 @@
 	  rta->nh.iface = n->iface;
 	  rta->nh.next = NULL;
 	  rta->hostentry = NULL;
+	  rta->nh.labels = 0;
 	}
 	break;
 
@@ -587,6 +589,7 @@
 	  rta->nh.iface = NULL;
 	  rta->nh.next = NULL;
 	  rta->hostentry = NULL;
+	  rta->nh.labels = 0;
 	}
 	break;
 
@@ -601,6 +604,22 @@
 	  rta->nh.iface = ifa;
 	  rta->nh.next = NULL;
 	  rta->hostentry = NULL;
+	  rta->nh.labels = 0;
+	}
+	break;
+
+      case SA_GW_MPLS:
+	{
+	  if (v1.val.i >= 0x100000)
+	    runtime( "Invalid MPLS label" );
+
+	  if (v1.val.i != MPLS_NULL)
+	  {
+	    rta->nh.label[0] = v1.val.i;
+	    rta->nh.labels = 1;
+	  }
+	  else
+	    rta->nh.labels = 0;
 	}
 	break;
 
-- 
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