From: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
Adds support for parsing extended control field. Extended control
field may be used for ERTM and streaming mode (if EWS specified).
ext_ctrl flag resides in cid table, added fixes for P-bit decode.
---
parser/l2cap.c | 140 ++++++++++++++++++++++++++++++++++++++++++++-----------
1 files changed, 112 insertions(+), 28 deletions(-)
diff --git a/parser/l2cap.c b/parser/l2cap.c
index d3d3b1c..e8c1a8d 100644
--- a/parser/l2cap.c
+++ b/parser/l2cap.c
@@ -51,6 +51,7 @@ typedef struct {
uint16_t psm;
uint16_t num;
uint8_t mode;
+ uint8_t ext_ctrl;
} cid_info;
#define CID_TABLE_SIZE 20
@@ -209,6 +210,27 @@ static uint8_t get_mode(int in, uint16_t handle, uint16_t cid)
return 0;
}
+static void set_ctrl(int in, uint16_t handle, uint16_t cid, uint8_t ext_ctrl)
+{
+ register cid_info *table = cid_table[in];
+ register int i;
+
+ for (i = 0; i < CID_TABLE_SIZE; i++)
+ if (table[i].handle == handle && table[i].cid == cid)
+ table[i].ext_ctrl = ext_ctrl;
+}
+
+static uint8_t get_ctrl(int in, uint16_t handle, uint16_t cid)
+{
+ register cid_info *table = cid_table[in];
+ register int i;
+
+ for (i = 0; i < CID_TABLE_SIZE; i++)
+ if (table[i].handle == handle && table[i].cid == cid)
+ return table[i].ext_ctrl;
+ return 0;
+}
+
static uint32_t get_val(uint8_t *ptr, uint8_t len)
{
switch (len) {
@@ -560,6 +582,7 @@ static void conf_opt(int level, void *ptr, int len, int in, uint16_t handle,
printf("EWS");
if (h->len > 0)
printf(" %d", get_val(h->val, h->len));
+ set_ctrl(in, handle, cid, 1);
break;
default:
@@ -761,6 +784,71 @@ static inline void info_rsp(int level, l2cap_cmd_hdr *cmd, struct frame *frm)
}
}
+static void l2cap_ctrl_ext_parse(int level, struct frame *frm, uint32_t ctrl)
+{
+ p_indent(level, frm);
+
+ printf("%s:", ctrl & L2CAP_EXT_CTRL_FRAME_TYPE ? "S-frame" : "I-frame");
+
+ if (ctrl & L2CAP_EXT_CTRL_FRAME_TYPE) {
+ printf(" %s", supervisory2str((ctrl & L2CAP_EXT_CTRL_SUPERVISE_MASK) >>
+ L2CAP_EXT_CTRL_SUPER_SHIFT));
+
+ if (ctrl & L2CAP_EXT_CTRL_POLL)
+ printf(" P-bit");
+ } else {
+ uint8_t sar = (ctrl & L2CAP_EXT_CTRL_SAR_MASK) >>
+ L2CAP_EXT_CTRL_SAR_SHIFT;
+ printf(" %s", sar2str(sar));
+ if (sar == L2CAP_SAR_START) {
+ uint16_t len;
+ len = btohs(bt_get_unaligned((uint16_t *) frm->ptr));
+ frm->ptr += L2CAP_SDULEN_SIZE;
+ frm->len -= L2CAP_SDULEN_SIZE;
+ printf(" (len %d)", len);
+ }
+ printf(" TxSeq %d", (ctrl & L2CAP_EXT_CTRL_TXSEQ_MASK) >>
+ L2CAP_EXT_CTRL_TXSEQ_SHIFT);
+ }
+
+ printf(" ReqSeq %d", (ctrl & L2CAP_EXT_CTRL_REQSEQ_MASK) >>
+ L2CAP_EXT_CTRL_REQSEQ_SHIFT);
+
+ if (ctrl & L2CAP_EXT_CTRL_FINAL)
+ printf(" F-bit");
+}
+
+static void l2cap_ctrl_parse(int level, struct frame *frm, uint32_t ctrl)
+{
+ p_indent(level, frm);
+
+ printf("%s:", ctrl & L2CAP_CTRL_FRAME_TYPE ? "S-frame" : "I-frame");
+
+ if (ctrl & 0x01) {
+ printf(" %s", supervisory2str((ctrl & L2CAP_CTRL_SUPERVISE_MASK) >>
+ L2CAP_CTRL_SUPER_SHIFT));
+
+ if (ctrl & L2CAP_CTRL_POLL)
+ printf(" P-bit");
+ } else {
+ uint8_t sar = (ctrl & L2CAP_CTRL_SAR_MASK) >> L2CAP_CTRL_SAR_SHIFT;
+ printf(" %s", sar2str(sar));
+ if (sar == L2CAP_SAR_START) {
+ uint16_t len;
+ len = btohs(bt_get_unaligned((uint16_t *) frm->ptr));
+ frm->ptr += L2CAP_SDULEN_SIZE;
+ frm->len -= L2CAP_SDULEN_SIZE;
+ printf(" (len %d)", len);
+ }
+ printf(" TxSeq %d", (ctrl & L2CAP_CTRL_TXSEQ_MASK) >> L2CAP_CTRL_TXSEQ_SHIFT);
+ }
+
+ printf(" ReqSeq %d", (ctrl & L2CAP_CTRL_REQSEQ_MASK) >> L2CAP_CTRL_REQSEQ_SHIFT);
+
+ if (ctrl & L2CAP_CTRL_FINAL)
+ printf(" F-bit");
+}
+
static void l2cap_parse(int level, struct frame *frm)
{
l2cap_hdr *hdr = (void *)frm->ptr;
@@ -871,49 +959,45 @@ static void l2cap_parse(int level, struct frame *frm)
/* Connection oriented channel */
uint8_t mode = get_mode(!frm->in, frm->handle, cid);
+ uint8_t ext_ctrl = get_ctrl(!frm->in, frm->handle, cid);
uint16_t psm = get_psm(!frm->in, frm->handle, cid);
- uint16_t ctrl = 0, fcs = 0;
- uint32_t proto;
+ uint16_t fcs = 0;
+ uint32_t proto, ctrl = 0;
frm->cid = cid;
frm->num = get_num(!frm->in, frm->handle, cid);
if (mode > 0) {
- ctrl = btohs(bt_get_unaligned((uint16_t *) frm->ptr));
- frm->ptr += 2;
- frm->len -= 4;
+ if (ext_ctrl) {
+ ctrl = get_val(frm->ptr, 4);
+ frm->ptr += 4;
+ frm->len -= 6;
+ } else {
+ ctrl = get_val(frm->ptr, 2);
+ frm->ptr += 2;
+ frm->len -= 4;
+ }
fcs = btohs(bt_get_unaligned((uint16_t *) (frm->ptr + frm->len)));
}
if (!p_filter(FILT_L2CAP)) {
p_indent(level, frm);
printf("L2CAP(d): cid 0x%4.4x len %d", cid, dlen);
- if (mode > 0)
- printf(" ctrl 0x%4.4x fcs 0x%4.4x", ctrl, fcs);
+ if (mode > 0) {
+ if (ext_ctrl)
+ printf(" ext_ctrl 0x%8.8x fcs 0x%4.4x", ctrl, fcs);
+ else
+ printf(" ctrl 0x%4.4x fcs 0x%4.4x", ctrl, fcs);
+ }
+
printf(" [psm %d]\n", psm);
level++;
if (mode > 0) {
- p_indent(level, frm);
- printf("%s:", ctrl & 0x01 ? "S-frame" : "I-frame");
- if (ctrl & 0x01) {
- printf(" %s", supervisory2str((ctrl & 0x0c) >> 2));
- } else {
- uint8_t sar = (ctrl & 0xc000) >> 14;
- printf(" %s", sar2str(sar));
- if (sar == 1) {
- uint16_t len;
- len = btohs(bt_get_unaligned((uint16_t *) frm->ptr));
- frm->ptr += 2;
- frm->len -= 2;
- printf(" (len %d)", len);
- }
- printf(" TxSeq %d", (ctrl & 0x7e) >> 1);
- }
- printf(" ReqSeq %d", (ctrl & 0x3f00) >> 8);
- if (ctrl & 0x80)
- printf(" F-bit");
- if (ctrl & 0x10)
- printf(" P-bit");
+ if (ext_ctrl)
+ l2cap_ctrl_ext_parse(level, frm, ctrl);
+ else
+ l2cap_ctrl_parse(level, frm, ctrl);
+
printf("\n");
}
}
--
1.7.4.1
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