gre: Support GRE over IPv6

GRE over IPv6 implementation.

Signed-off-by: Dmitry Kozlov <xeb@mail.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 0 deletions

diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 5728695b5449..4f7fe7270e37 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -201,6 +201,22 @@ config IPV6_TUNNEL
 
           If unsure, say N.
 
+config IPV6_GRE
+        tristate "IPv6: GRE tunnel"
+        select IPV6_TUNNEL
+        ---help---
+          Tunneling means encapsulating data of one protocol type within
+          another protocol and sending it over a channel that understands the
+          encapsulating protocol. This particular tunneling driver implements
+          GRE (Generic Routing Encapsulation) and at this time allows
+          encapsulating of IPv4 or IPv6 over existing IPv6 infrastructure.
+          This driver is useful if the other endpoint is a Cisco router: Cisco
+          likes GRE much better than the other Linux tunneling driver ("IP
+          tunneling" above). In addition, GRE allows multicast redistribution
+          through the tunnel.
+
+          Saying M here will produce a module called ip6_gre. If unsure, say N.
+
 config IPV6_MULTIPLE_TABLES
         bool "IPv6: Multiple Routing Tables"
         depends on EXPERIMENTAL