[RFCv4 21/30] Bluetooth: A2MP: Process A2MP Get AMP Assoc Request

Andrei Emeltchenko
2012-03-15T12:30:12Z

Example trace when receiving AMP Assoc Request with wrong AMP id.
...
> ACL data: handle 11 flags 0x02 dlen 13
A2MP: Get AMP Assoc req: id 238
< ACL data: handle 11 flags 0x00 dlen 14
A2MP: Get AMP Assoc rsp: id 238 status (1) Invalid Controller ID
assoc data:
...

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
---
net/bluetooth/a2mp.c | 32 ++++++++++++++++++++++++++++++++
1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
index 96d4dfe..a275879 100644
--- a/net/bluetooth/a2mp.c
+++ b/net/bluetooth/a2mp.c
@@ -213,6 +213,35 @@ static inline int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
return 0;
}

+static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_amp_assoc_req *req =
+ (struct a2mp_amp_assoc_req *)skb->data;
+ struct hci_dev *hdev;
+
+ if (le16_to_cpu(hdr->len) < sizeof(*req))
+ return -EINVAL;
+
+ BT_DBG("id %d", req->id);
+
+ hdev = hci_dev_get(req->id);
+ if (!hdev || hdev->amp_type == HCI_BREDR) {
+ struct a2mp_amp_assoc_rsp rsp;
+ rsp.id = req->id;
+ rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
+
+ a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
+ &rsp);
+ }
+
+ if (hdev)
+ hci_dev_put(hdev);
+
+ skb_pull(skb, sizeof(*req));
+ return 0;
+}
+
/* Handle A2MP signalling */
static int a2mp_chan_recv_cb(void *data, struct sk_buff *skb)
{
@@ -255,6 +284,9 @@ static int a2mp_chan_recv_cb(void *data, struct sk_buff *skb)
break;

case A2MP_GETAMPASSOC_REQ:
+ err = a2mp_getampassoc_req(mgr, skb, hdr);
+ break;
+
case A2MP_CREATEPHYSLINK_REQ:
case A2MP_DISCONNPHYSLINK_REQ:
case A2MP_CHANGE_RSP:
--
1.7.9.1