gre: Add Transparent Ethernet Bridging

This patch adds support for Ethernet over GRE encapsulation.
This is exposed to user-space with a new link type of "gretap"
instead of "gre".  It will create an ARPHRD_ETHER device in
lieu of the usual ARPHRD_IPGRE.

Note that to preserver backwards compatibility all Transparent
Ethernet Bridging packets are passed to an ARPHRD_IPGRE tunnel
if its key matches and there is no ARPHRD_ETHER device whose
key matches more closely.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index a0099e98b5c4..bf1a53b2682e 100644
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -56,6 +56,7 @@
 #define ETH_P_DIAG      0x6005          /* DEC Diagnostics              */
 #define ETH_P_CUST      0x6006          /* DEC Customer use             */
 #define ETH_P_SCA       0x6007          /* DEC Systems Comms Arch       */
+#define ETH_P_TEB       0x6558          /* Trans Ether Bridging         */
 #define ETH_P_RARP      0x8035          /* Reverse Addr Res packet      */
 #define ETH_P_ATALK     0x809B          /* Appletalk DDP                */
 #define ETH_P_AARP      0x80F3          /* Appletalk AARP               */