From f121e780a0ca44b5b0324d313cf5e8b01d54b37b Mon Sep 17 00:00:00 2001
From: Sapan Bhatia <sapanb@cs.princeton.edu>
Date: Tue, 3 Nov 2009 20:52:59 +0000
Subject: [PATCH] Flowspec processor for sfatables.

---
 sfatables/processors/restrict_to_flowspec.xsl | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 sfatables/processors/restrict_to_flowspec.xsl

diff --git a/sfatables/processors/restrict_to_flowspec.xsl b/sfatables/processors/restrict_to_flowspec.xsl
new file mode 100644
index 00000000..a919da75
--- /dev/null
+++ b/sfatables/processors/restrict_to_flowspec.xsl
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="ISO-8859-1"?>
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+    <!-- Magic sauce copied from a manual. This fragment basically copies everything except for
+    stuff that explicitly matches with the templates defined below. In the case of such a match,
+    the matched node is treated differently.-->
+    <xsl:template match="@* | node()">
+        <xsl:copy>
+            <xsl:apply-templates select="@* | node()"/>
+        </xsl:copy>
+    </xsl:template>
+
+    <xsl:variable name="wswitch" select="//RSpec//target-context/argument[name='whitelist-switch']/value"/>
+    <xsl:variable name="wtpsrc" select="//RSpec//target-context/argument[name='whitelist-tpsrc']/value"/>
+    <xsl:variable name="wtpdst" select="//RSpec//target-context/argument[name='whitelist-tpdst']/value"/>
+    <xsl:variable name="wipsrc" select="//RSpec//target-context/argument[name='whitelist-ipsrc']/value"/>
+    <xsl:variable name="wipdst" select="//RSpec//target-context/argument[name='whitelist-ipdst']/value"/>
+
+    <!-- Drop nodes that are not in the whitelist -->
+    <xsl:template match="//switchEntry">
+            <xsl:choose>
+                <xsl:when test="(nodeId==$wswitch) and 
+                    (interfaceEntry/flowSpaceEntry/tp_src==$wtpsrc) and
+                    (interfaceEntry/flowSpaceEntry/tp_dst==$wtpdst)">
+                    <xsl:copy-of select="."/>
+                </xsl:when>
+                <xsl:otherwise/>
+            </xsl:choose>
+    </xsl:template>
+
+</xsl:stylesheet>
-- 
2.43.0