2 Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved.
3 Copyright (c) 2011,2012 Intel Corp.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License version 2 and
7 only version 2 as published by the Free Software Foundation.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
15 #include <net/bluetooth/bluetooth.h>
16 #include <net/bluetooth/hci_core.h>
17 #include <net/bluetooth/l2cap.h>
18 #include <net/bluetooth/a2mp.h>
19 #include <net/bluetooth/amp.h>
21 /* Global AMP Manager list */
22 LIST_HEAD(amp_mgr_list);
23 DEFINE_MUTEX(amp_mgr_list_lock);
25 /* A2MP build & send command helper functions */
26 static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
31 plen = sizeof(*cmd) + len;
32 cmd = kzalloc(plen, GFP_KERNEL);
38 cmd->len = cpu_to_le16(len);
40 memcpy(cmd->data, data, len);
45 void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data)
47 struct l2cap_chan *chan = mgr->a2mp_chan;
49 u16 total_len = len + sizeof(*cmd);
53 cmd = __a2mp_build(code, ident, len, data);
58 iv.iov_len = total_len;
60 memset(&msg, 0, sizeof(msg));
62 msg.msg_iov = (struct iovec *) &iv;
65 l2cap_chan_send(chan, &msg, total_len, 0);
70 static inline void __a2mp_cl_bredr(struct a2mp_cl *cl)
77 /* hci_dev_list shall be locked */
78 static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl, u8 num_ctrl)
85 list_for_each_entry(hdev, &hci_dev_list, list) {
86 /* Iterate through AMP controllers */
87 if (hdev->id == HCI_BREDR_ID)
90 /* Starting from second entry */
95 cl[i].type = hdev->amp_type;
96 cl[i].status = hdev->amp_status;
100 /* Processing A2MP messages */
101 static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb,
102 struct a2mp_cmd *hdr)
104 struct a2mp_cmd_rej *rej = (void *) skb->data;
106 if (le16_to_cpu(hdr->len) < sizeof(*rej))
109 BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason));
111 skb_pull(skb, sizeof(*rej));
116 static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
117 struct a2mp_cmd *hdr)
119 struct a2mp_discov_req *req = (void *) skb->data;
120 u16 len = le16_to_cpu(hdr->len);
121 struct a2mp_discov_rsp *rsp;
125 if (len < sizeof(*req))
128 skb_pull(skb, sizeof(*req));
130 ext_feat = le16_to_cpu(req->ext_feat);
132 BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat);
134 /* check that packet is not broken for now */
135 while (ext_feat & A2MP_FEAT_EXT) {
136 if (len < sizeof(ext_feat))
139 ext_feat = get_unaligned_le16(skb->data);
140 BT_DBG("efm 0x%4.4x", ext_feat);
141 len -= sizeof(ext_feat);
142 skb_pull(skb, sizeof(ext_feat));
145 read_lock(&hci_dev_list_lock);
147 num_ctrl = __hci_num_ctrl();
148 len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp);
149 rsp = kmalloc(len, GFP_ATOMIC);
151 read_unlock(&hci_dev_list_lock);
155 rsp->mtu = __constant_cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
158 __a2mp_add_cl(mgr, rsp->cl, num_ctrl);
160 read_unlock(&hci_dev_list_lock);
162 a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
168 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
169 struct a2mp_cmd *hdr)
171 struct a2mp_cl *cl = (void *) skb->data;
173 while (skb->len >= sizeof(*cl)) {
174 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
176 cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl));
179 /* TODO send A2MP_CHANGE_RSP */
184 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
185 struct a2mp_cmd *hdr)
187 struct a2mp_info_req *req = (void *) skb->data;
188 struct hci_dev *hdev;
190 if (le16_to_cpu(hdr->len) < sizeof(*req))
193 BT_DBG("id %d", req->id);
195 hdev = hci_dev_get(req->id);
197 struct a2mp_info_rsp rsp;
200 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
202 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
206 if (hdev->dev_type != HCI_BREDR) {
207 mgr->state = READ_LOC_AMP_INFO;
208 hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
213 skb_pull(skb, sizeof(*req));
217 static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
218 struct a2mp_cmd *hdr)
220 struct a2mp_amp_assoc_req *req = (void *) skb->data;
221 struct hci_dev *hdev;
224 if (le16_to_cpu(hdr->len) < sizeof(*req))
227 BT_DBG("id %d", req->id);
229 /* Make sure that other request is not processed */
230 tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
232 hdev = hci_dev_get(req->id);
233 if (!hdev || hdev->amp_type == HCI_BREDR || tmp) {
234 struct a2mp_amp_assoc_rsp rsp;
238 rsp.status = A2MP_STATUS_COLLISION_OCCURED;
241 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
244 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
250 amp_read_loc_assoc(hdev, mgr);
256 skb_pull(skb, sizeof(*req));
260 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
261 struct a2mp_cmd *hdr)
263 struct a2mp_physlink_req *req = (void *) skb->data;
265 struct a2mp_physlink_rsp rsp;
266 struct hci_dev *hdev;
268 if (le16_to_cpu(hdr->len) < sizeof(*req))
271 BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
273 rsp.local_id = req->remote_id;
274 rsp.remote_id = req->local_id;
276 hdev = hci_dev_get(req->remote_id);
277 if (!hdev || hdev->amp_type != HCI_AMP) {
278 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
282 /* TODO process physlink create */
284 rsp.status = A2MP_STATUS_SUCCESS;
290 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident, sizeof(rsp),
293 skb_pull(skb, le16_to_cpu(hdr->len));
297 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
298 struct a2mp_cmd *hdr)
300 struct a2mp_physlink_req *req = (void *) skb->data;
301 struct a2mp_physlink_rsp rsp;
302 struct hci_dev *hdev;
304 if (le16_to_cpu(hdr->len) < sizeof(*req))
307 BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
309 rsp.local_id = req->remote_id;
310 rsp.remote_id = req->local_id;
311 rsp.status = A2MP_STATUS_SUCCESS;
313 hdev = hci_dev_get(req->local_id);
315 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
319 /* TODO Disconnect Phys Link here */
324 a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
326 skb_pull(skb, sizeof(*req));
330 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
331 struct a2mp_cmd *hdr)
333 BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
335 skb_pull(skb, le16_to_cpu(hdr->len));
339 /* Handle A2MP signalling */
340 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
342 struct a2mp_cmd *hdr;
343 struct amp_mgr *mgr = chan->data;
348 while (skb->len >= sizeof(*hdr)) {
351 hdr = (void *) skb->data;
352 len = le16_to_cpu(hdr->len);
354 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
356 skb_pull(skb, sizeof(*hdr));
358 if (len > skb->len || !hdr->ident) {
363 mgr->ident = hdr->ident;
366 case A2MP_COMMAND_REJ:
367 a2mp_command_rej(mgr, skb, hdr);
370 case A2MP_DISCOVER_REQ:
371 err = a2mp_discover_req(mgr, skb, hdr);
374 case A2MP_CHANGE_NOTIFY:
375 err = a2mp_change_notify(mgr, skb, hdr);
378 case A2MP_GETINFO_REQ:
379 err = a2mp_getinfo_req(mgr, skb, hdr);
382 case A2MP_GETAMPASSOC_REQ:
383 err = a2mp_getampassoc_req(mgr, skb, hdr);
386 case A2MP_CREATEPHYSLINK_REQ:
387 err = a2mp_createphyslink_req(mgr, skb, hdr);
390 case A2MP_DISCONNPHYSLINK_REQ:
391 err = a2mp_discphyslink_req(mgr, skb, hdr);
394 case A2MP_CHANGE_RSP:
395 case A2MP_DISCOVER_RSP:
396 case A2MP_GETINFO_RSP:
397 case A2MP_GETAMPASSOC_RSP:
398 case A2MP_CREATEPHYSLINK_RSP:
399 case A2MP_DISCONNPHYSLINK_RSP:
400 err = a2mp_cmd_rsp(mgr, skb, hdr);
404 BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
411 struct a2mp_cmd_rej rej;
413 rej.reason = __constant_cpu_to_le16(0);
414 hdr = (void *) skb->data;
416 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
418 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
422 /* Always free skb and return success error code to prevent
423 from sending L2CAP Disconnect over A2MP channel */
431 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
433 l2cap_chan_put(chan);
436 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state)
438 struct amp_mgr *mgr = chan->data;
443 BT_DBG("chan %p state %s", chan, state_to_string(state));
455 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
456 unsigned long len, int nb)
458 return bt_skb_alloc(len, GFP_KERNEL);
461 static struct l2cap_ops a2mp_chan_ops = {
462 .name = "L2CAP A2MP channel",
463 .recv = a2mp_chan_recv_cb,
464 .close = a2mp_chan_close_cb,
465 .state_change = a2mp_chan_state_change_cb,
466 .alloc_skb = a2mp_chan_alloc_skb_cb,
468 /* Not implemented for A2MP */
469 .new_connection = l2cap_chan_no_new_connection,
470 .teardown = l2cap_chan_no_teardown,
471 .ready = l2cap_chan_no_ready,
474 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn)
476 struct l2cap_chan *chan;
479 chan = l2cap_chan_create();
483 BT_DBG("chan %p", chan);
485 chan->chan_type = L2CAP_CHAN_CONN_FIX_A2MP;
486 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
488 chan->ops = &a2mp_chan_ops;
490 l2cap_chan_set_defaults(chan);
491 chan->remote_max_tx = chan->max_tx;
492 chan->remote_tx_win = chan->tx_win;
494 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
495 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
497 skb_queue_head_init(&chan->tx_q);
499 chan->mode = L2CAP_MODE_ERTM;
501 err = l2cap_ertm_init(chan);
503 l2cap_chan_del(chan, 0);
507 chan->conf_state = 0;
509 l2cap_chan_add(conn, chan);
511 chan->remote_mps = chan->omtu;
512 chan->mps = chan->omtu;
514 chan->state = BT_CONNECTED;
519 /* AMP Manager functions */
520 void amp_mgr_get(struct amp_mgr *mgr)
522 BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
524 kref_get(&mgr->kref);
527 static void amp_mgr_destroy(struct kref *kref)
529 struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
531 BT_DBG("mgr %p", mgr);
533 mutex_lock(&_mgr_list_lock);
534 list_del(&mgr->list);
535 mutex_unlock(&_mgr_list_lock);
540 int amp_mgr_put(struct amp_mgr *mgr)
542 BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
544 return kref_put(&mgr->kref, &_mgr_destroy);
547 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn)
550 struct l2cap_chan *chan;
552 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
556 BT_DBG("conn %p mgr %p", conn, mgr);
558 mgr->l2cap_conn = conn;
560 chan = a2mp_chan_open(conn);
566 mgr->a2mp_chan = chan;
569 conn->hcon->amp_mgr = mgr;
571 kref_init(&mgr->kref);
573 mutex_lock(&_mgr_list_lock);
574 list_add(&mgr->list, &_mgr_list);
575 mutex_unlock(&_mgr_list_lock);
580 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
585 mgr = amp_mgr_create(conn);
587 BT_ERR("Could not create AMP manager");
591 BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
593 return mgr->a2mp_chan;
596 struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
600 mutex_lock(&_mgr_list_lock);
601 list_for_each_entry(mgr, &_mgr_list, list) {
602 if (mgr->state == state) {
604 mutex_unlock(&_mgr_list_lock);
608 mutex_unlock(&_mgr_list_lock);
613 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
616 struct a2mp_info_rsp rsp;
618 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
622 BT_DBG("%s mgr %p", hdev->name, mgr);
625 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
627 if (hdev->amp_type != HCI_BREDR) {
629 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
630 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
631 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
632 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
633 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
636 a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
640 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
643 struct amp_assoc *loc_assoc = &hdev->loc_assoc;
644 struct a2mp_amp_assoc_rsp *rsp;
647 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
651 BT_DBG("%s mgr %p", hdev->name, mgr);
653 len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
654 rsp = kzalloc(len, GFP_KERNEL);
663 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
665 rsp->status = A2MP_STATUS_SUCCESS;
666 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
669 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);