From: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
Implement basic processing for AMP Manager Protocol (A2MP).
Example below shows processing unrecognized command.
...
> ACL data: handle 11 flags 0x02 dlen 12
A2MP: code 0x00 ident 3 len 0
< ACL data: handle 11 flags 0x00 dlen 14
A2MP: Command Reject: reason (0) - Command not recognized
...
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
---
net/bluetooth/a2mp.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 58 insertions(+), 1 deletions(-)
diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
index 6ffdd12..4e45897 100644
--- a/net/bluetooth/a2mp.c
+++ b/net/bluetooth/a2mp.c
@@ -75,6 +75,63 @@ static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len,
kfree(cmd);
}
+/* Handle A2MP signalling */
+void a2mp_receive(struct sock *sk, struct sk_buff *skb)
+{
+ struct a2mp_cmd *hdr = (struct a2mp_cmd *) skb->data;
+ struct amp_mgr *mgr;
+ int err = 0;
+
+ mgr = get_amp_mgr_sk(sk);
+ if (!mgr)
+ return;
+
+ while (skb->len >= sizeof(*hdr)) {
+ struct a2mp_cmd *hdr = (struct a2mp_cmd *) skb->data;
+ u16 len = le16_to_cpu(hdr->len);
+
+ BT_DBG("code 0x%02x id %d len %d", hdr->code, hdr->ident, len);
+
+ skb_pull(skb, sizeof(*hdr));
+
+ if (len > skb->len || !hdr->ident) {
+ err = -EINVAL;
+ break;
+ }
+
+ switch (hdr->code) {
+ case A2MP_COMMAND_REJ:
+ case A2MP_DISCOVER_REQ:
+ case A2MP_CHANGE_NOTIFY:
+ case A2MP_GETINFO_REQ:
+ case A2MP_GETAMPASSOC_REQ:
+ case A2MP_CREATEPHYSLINK_REQ:
+ case A2MP_DISCONNPHYSLINK_REQ:
+ case A2MP_CHANGE_RSP:
+ case A2MP_DISCOVER_RSP:
+ case A2MP_GETINFO_RSP:
+ case A2MP_GETAMPASSOC_RSP:
+ case A2MP_CREATEPHYSLINK_RSP:
+ case A2MP_DISCONNPHYSLINK_RSP:
+ default:
+ BT_ERR("Unknown A2MP signaling command 0x%2.2x",
+ hdr->code);
+ err = -EINVAL;
+ break;
+ }
+ }
+
+ if (err) {
+ struct a2mp_cmd_rej rej;
+ rej.reason = cpu_to_le16(0);
+
+ a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
+ &rej);
+ }
+
+ amp_mgr_put(mgr);
+}
+
static void data_ready_worker(struct work_struct *w)
{
struct a2mp_work_data_ready *work = (struct a2mp_work_data_ready *) w;
@@ -85,7 +142,7 @@ static void data_ready_worker(struct work_struct *w)
/* skb_dequeue() is thread-safe */
while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
- /* process a2mp here */
+ a2mp_receive(sk, skb);
kfree_skb(skb);
}
--
1.7.4.1
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