6lowpan: add nhc module for GHC hop-by-hopextension header detection

[sfrench/cifs-2.6.git] / net / 6lowpan / nhc_ghc_ext_hop.c

diff --git a/net/6lowpan/nhc_ghc_ext_hop.c b/net/6lowpan/nhc_ghc_ext_hop.c
new file mode 100644 (file)
index 0000000..baec86f
--- /dev/null
+++ b/net/6lowpan/nhc_ghc_ext_hop.c
@@ -0,0 +1,27 @@
+/*
+ *     6LoWPAN Extension Header compression according to RFC7400
+ *
+ *     This program is free software; you can redistribute it and/or
+ *     modify it under the terms of the GNU General Public License
+ *     as published by the Free Software Foundation; either version
+ *     2 of the License, or (at your option) any later version.
+ */
+
+#include "nhc.h"
+
+#define LOWPAN_GHC_EXT_HOP_IDLEN       1
+#define LOWPAN_GHC_EXT_HOP_ID_0                0xb0
+#define LOWPAN_GHC_EXT_HOP_MASK_0      0xfe
+
+static void hop_ghid_setup(struct lowpan_nhc *nhc)
+{
+       nhc->id[0] = LOWPAN_GHC_EXT_HOP_ID_0;
+       nhc->idmask[0] = LOWPAN_GHC_EXT_HOP_MASK_0;
+}
+
+LOWPAN_NHC(ghc_ext_hop, "RFC7400 Hop-by-Hop Extension Header", NEXTHDR_HOP, 0,
+          hop_ghid_setup, LOWPAN_GHC_EXT_HOP_IDLEN, NULL, NULL);
+
+module_lowpan_nhc(ghc_ext_hop);
+MODULE_DESCRIPTION("6LoWPAN generic header hop-by-hop extension compression");
+MODULE_LICENSE("GPL");