From Pascal Quantin:

Add the following enhancements to the UMTS RLC dissector
(as specified in 3GPP 25.322 v9.2.0):
- UDP framing protocol to allow dissection of RLC PDUs over UDP (like what is
done for LTE MAC/RLC/PDCP protocols)
- 15 bits Length Indicator support (both with variable and fixed LI size)
- Poll type SUFI
- enhanced dissection of LIST, Relative List and Bitmap SUFI
- dissection of Reset and Reset Ack Control PDU
- an option to decode RLC headers only
- an option to skip SDU reassembly

svn path=/trunk/; revision=37576

epan/dissectors/packet-fp_hint.c

@@ -189,6 +189,7 @@ static guint16 assign_rb_info(tvbuff_t *tvb, packet_info *pinfo, guint16 offset,
 		rlcinf->urnti[i] = urnti;
 		rlcinf->ciphered[i] = ciphered;
 		rlcinf->deciphered[i] = deciphered;
+		rlcinf->li_size[i] = RLC_LI_VARIABLE;
 
 		macinf->ctmux[i] = ctmux ? TRUE : FALSE;
 		switch (content) {

epan/dissectors/packet-rlc.h

@@ -27,12 +27,84 @@ enum rlc_mode {
 	RLC_AM
 };
 
+enum rlc_li_size {
+	RLC_LI_VARIABLE,
+	RLC_LI_7BITS,
+	RLC_LI_15BITS
+	};
+
 #define MAX_RLC_CHANS 64
 typedef struct rlc_info
 {
 	guint32 urnti[MAX_RLC_CHANS];
 	guint8 mode[MAX_RLC_CHANS];
 	guint8 rbid[MAX_RLC_CHANS];
+	enum rlc_li_size li_size[MAX_RLC_CHANS];
 	gboolean ciphered[MAX_RLC_CHANS];
 	gboolean deciphered[MAX_RLC_CHANS];
 } rlc_info;
+
+/*****************************************************************/
+/* UDP framing format                                            */
+/* -----------------------                                       */
+/* Several people have asked about dissecting RLC by framing     */
+/* PDUs over IP.  A suggested format over UDP has been defined   */
+/* and implemented by this dissector, using the definitions      */
+/* below. A link to an example program showing you how to encode */
+/* these headers and send RLC PDUs on a UDP socket is provided   */
+/* at http://wiki.wireshark.org/RLC                              */
+/*                                                               */
+/* A heuristic dissecter (enabled by a preference) will          */
+/* recognise a signature at the beginning of these frames.       */
+/* Until someone is using this format, suggestions for changes   */
+/* are welcome.                                                  */
+/*****************************************************************/
+
+
+/* Signature.  Rather than try to define a port for this, or make the
+   port number a preference, frames will start with this string (with no
+   terminating NULL */
+#define RLC_START_STRING "umts-rlc"
+
+/* Conditional fields. The channel type or RLC mode should be present.
+   If the channel type is present, the RLC mode will be ignored.
+   If none of them is present, the decoding will be skipped.
+   The RLC mode tag uses the values from the rlc_mode enum. */
+
+#define CHANNEL_TYPE_UNSPECIFIED 0
+#define CHANNEL_TYPE_PCCH 1
+#define CHANNEL_TYPE_CCCH 2
+#define CHANNEL_TYPE_DCCH 3
+#define CHANNEL_TYPE_PS_DTCH 4
+#define CHANNEL_TYPE_CTCH 5
+
+#define RLC_CHANNEL_TYPE_TAG    0x02
+/* 1 byte */
+
+#define RLC_MODE_TAG            0x03
+/* 1 byte, enum rlc_mode value */
+
+/* Optional fields. Attaching this info to frames will allow you
+   to show you display/filter/plot/add-custom-columns on these fields, so should
+   be added if available.
+   The format is to have the tag, followed by the value (there is no length field,
+   its implicit from the tag) */
+
+#define DIRECTION_UPLINK 0
+#define DIRECTION_DOWNLINK 1
+
+#define RLC_DIRECTION_TAG       0x04
+/* 1 byte */
+
+#define RLC_URNTI_TAG           0x05
+/* 4 bytes, network order */
+
+#define RLC_RADIO_BEARER_ID_TAG 0x06
+/* 1 byte */
+
+#define RLC_LI_SIZE_TAG         0x07
+/* 1 byte, enum rlc_li_size value */
+
+/* RLC PDU. Following this tag comes the actual RLC PDU (there is no length, the PDU
+   continues until the end of the frame) */
+#define RLC_PAYLOAD_TAG         0x01