From cf15ea6afd9afb2f756e819126b4db8ed244adf9 Mon Sep 17 00:00:00 2001
From: Claudio Jeker <claudio@cvs.openbsd.org>
Date: Tue, 12 Apr 2005 14:32:02 +0000
Subject: Introduce a per prefix weight.  The weight is used to tip prefixes
 with equal long AS pathes in one or the other direction.  It weights a prefix
 at a very late stage in the decision process. This is a nice bgpd feature to
 traffic engineer networks where most AS pathes are equally long. OK henning@

---
 usr.sbin/bgpd/parse.y | 33 ++++++++++++++++++++++++++++++---
 1 file changed, 30 insertions(+), 3 deletions(-)

(limited to 'usr.sbin/bgpd/parse.y')

diff --git a/usr.sbin/bgpd/parse.y b/usr.sbin/bgpd/parse.y
index 0eddbd03158..a2d47a30084 100644
--- a/usr.sbin/bgpd/parse.y
+++ b/usr.sbin/bgpd/parse.y
@@ -1,4 +1,4 @@
-/*	$OpenBSD: parse.y,v 1.157 2005/04/12 14:26:58 claudio Exp $ */
+/*	$OpenBSD: parse.y,v 1.158 2005/04/12 14:32:00 claudio Exp $ */
 
 /*
  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -152,7 +152,7 @@ typedef struct {
 %token	FROM TO ANY
 %token	PREFIX PREFIXLEN SOURCEAS TRANSITAS COMMUNITY
 %token	SET LOCALPREF MED METRIC NEXTHOP REJECT BLACKHOLE NOMODIFY
-%token	PREPEND_SELF PREPEND_PEER PFTABLE
+%token	PREPEND_SELF PREPEND_PEER PFTABLE WEIGHT
 %token	ERROR
 %token	IPSEC ESP AH SPI IKE
 %token	<v.string>		STRING
@@ -1206,6 +1206,32 @@ filter_set_opt	: LOCALPREF number		{
 			$$->type = ACTION_SET_RELATIVE_MED;
 			$$->action.relative = -$3;
 		}
+		| WEIGHT number				{
+			if (($$ = calloc(1, sizeof(struct filter_set))) == NULL)
+				fatal(NULL);
+			$$->type = ACTION_SET_WEIGHT;
+			$$->action.metric = $2;
+		}
+		| WEIGHT '+' number			{
+			if ($3 > INT_MAX) {
+				yyerror("weight to big: max %u", INT_MAX);
+				YYERROR;
+			}
+			if (($$ = calloc(1, sizeof(struct filter_set))) == NULL)
+				fatal(NULL);
+			$$->type = ACTION_SET_RELATIVE_WEIGHT;
+			$$->action.metric = $3;
+		}
+		| WEIGHT '-' number			{
+			if ($3 > INT_MAX) {
+				yyerror("weight to small: min -%u", INT_MAX);
+				YYERROR;
+			}
+			if (($$ = calloc(1, sizeof(struct filter_set))) == NULL)
+				fatal(NULL);
+			$$->type = ACTION_SET_RELATIVE_WEIGHT;
+			$$->action.relative = -$3;
+		}
 		| NEXTHOP address		{
 			if (($$ = calloc(1, sizeof(struct filter_set))) == NULL)
 				fatal(NULL);
@@ -1417,7 +1443,8 @@ lookup(char *s)
 		{ "tcp",		TCP},
 		{ "to",			TO},
 		{ "transit-as",		TRANSITAS},
-		{ "transparent-as",	TRANSPARENT}
+		{ "transparent-as",	TRANSPARENT},
+		{ "weight",		WEIGHT}
 	};
 	const struct keywords	*p;
 
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