Add support for WCCPv2. It should be enablem manually using link2

ifconfig(8) flag since header for version 2 is the same but IP payload
is prepended with additional 4-bytes field.

Inspired by:	Roman Synyuk <roman@univ.kiev.ua>
MFC after:	2 weeks

1 files changed, 12 insertions, 0 deletions

diff --git a/sys/net/if_gre.h b/sys/net/if_gre.h
index 73fed0b..21fab39 100644
--- a/sys/net/if_gre.h
+++ b/sys/net/if_gre.h
@@ -44,6 +44,16 @@
 #ifdef _KERNEL
 #include <sys/queue.h>
 
+/*
+ * Version of the WCCP, need to be configured manually since
+ * header for version 2 is the same but IP payload is prepended
+ * with additional 4-bytes field.
+ */
+typedef enum {
+	WCCP_V1 = 0,
+	WCCP_V2
+} wccp_ver_t;
+
 struct gre_softc {
 	struct ifnet sc_if;
 	LIST_ENTRY(gre_softc) sc_list;
@@ -58,6 +68,8 @@ struct gre_softc {
 	const struct encaptab *encap;	/* encapsulation cookie */
 
 	int called;		/* infinite recursion preventer */
+
+	wccp_ver_t wccp_ver;	/* version of the WCCP */
 };