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authoralex.bluesman.smirnov@gmail.com <alex.bluesman.smirnov@gmail.com>2011-11-10 07:38:38 +0000
committerDavid S. Miller <davem@davemloft.net>2011-11-14 00:19:42 -0500
commit719269afbc69ab96339aad6c2d3b32f7d8311146 (patch)
tree26a25b23d982a8bccaa807ac813e3b387d133697 /net/ieee802154/6lowpan.h
parent2a24444f8f2bea694003e3eac5c2f8d9a386bdc5 (diff)
6LoWPAN: add fragmentation support
This patch adds support for frame fragmentation. Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ieee802154/6lowpan.h')
-rw-r--r--net/ieee802154/6lowpan.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/net/ieee802154/6lowpan.h b/net/ieee802154/6lowpan.h
index 5d8cf80b930d..5d2e5a03742f 100644
--- a/net/ieee802154/6lowpan.h
+++ b/net/ieee802154/6lowpan.h
@@ -159,6 +159,24 @@
#define LOWPAN_DISPATCH_FRAG1 0xc0 /* 11000xxx */
#define LOWPAN_DISPATCH_FRAGN 0xe0 /* 11100xxx */
+#define LOWPAN_DISPATCH_MASK 0xf8 /* 11111000 */
+
+#define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */
+
+#define LOWPAN_FRAG1_HEAD_SIZE 0x4
+#define LOWPAN_FRAGN_HEAD_SIZE 0x5
+
+/*
+ * According IEEE802.15.4 standard:
+ * - MTU is 127 octets
+ * - maximum MHR size is 37 octets
+ * - MFR size is 2 octets
+ *
+ * so minimal payload size that we may guarantee is:
+ * MTU - MHR - MFR = 88 octets
+ */
+#define LOWPAN_FRAG_SIZE 88
+
/*
* Values of fields within the IPHC encoding first byte
* (C stands for compressed and I for inline)