ipcpd: Add IPCP over DIX Ethernet

This adds an IPC Process that uses DIX Ethernet with an Ethertype that
is configurable at bootstrap. This allows parallel DIX layers over the
same Ethernet network with different Ethertypes (and one LLC
layer). It allows jumbo frames in the future, and should avoid the
problems we have with some routers not handling LLC traffic very
well. The destination endpoint ID is sent as a 16 bit integer, so the
maximum payload is 1498 bytes in standard Ethernet, and 8998 bytes
when Jumbo frames are used.

The implementation is very similar to the Ethernet LLC IPCP, so it is
implemented using preprocessor macros in the single source instead of
duplicating code.

Signed-off-by: Dimitri Staessens <dimitri.staessens@ugent.be>
Signed-off-by: Sander Vrijders <sander.vrijders@ugent.be>

1 files changed, 6 insertions, 2 deletions

diff --git a/include/ouroboros/ipcp.h b/include/ouroboros/ipcp.h
index e39137db..dc2c37f5 100644
--- a/include/ouroboros/ipcp.h
+++ b/include/ouroboros/ipcp.h
@@ -38,6 +38,7 @@ enum ipcp_type {
         IPCP_NORMAL,
         IPCP_RAPTOR,
         IPCP_ETH_LLC,
+        IPCP_ETH_DIX,
         IPCP_UDP
 };
 
@@ -88,8 +89,11 @@ struct ipcp_config {
         uint32_t           ip_addr;
         uint32_t           dns_addr;
 
-        /* Ethernet LLC */
-        char *             if_name;
+        /* Ethernet */
+        char *             dev;
+
+        /* Ethernet DIX */
+        uint16_t           ethertype;
 };
 
 #endif /* OUROBOROS_IPCP_H */