From 316a98ecd151dfba86a4a87e11c98cb2a0e94518 Mon Sep 17 00:00:00 2001
From: Christian Franke <chris@opensourcerouting.org>
Date: Thu, 27 Apr 2017 12:56:11 +0200
Subject: isisd: implement draft-ietf-isis-ext-eth and support p2p over LAN on
 BSD

Signed-off-by: Christian Franke <chris@opensourcerouting.org>
---
 isisd/isis_constants.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'isisd/isis_constants.h')

diff --git a/isisd/isis_constants.h b/isisd/isis_constants.h
index 17616d671b..ec0f6fb62c 100644
--- a/isisd/isis_constants.h
+++ b/isisd/isis_constants.h
@@ -171,4 +171,14 @@
 #define ETH_ALEN 6
 #endif
 
+#define MAX_LLC_LEN 0x5ff
+#define ETHERTYPE_EXT_LLC 0x8870
+
+static inline uint16_t isis_ethertype(size_t len)
+{
+  if (len > MAX_LLC_LEN)
+    return ETHERTYPE_EXT_LLC;
+  return len;
+}
+
 #endif /* ISIS_CONSTANTS_H */
-- 
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