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 u8 __next_ident(struct amp_mgr *mgr)
72 if (++mgr->ident == 0)
78 static inline void __a2mp_cl_bredr(struct a2mp_cl *cl)
85 /* hci_dev_list shall be locked */
86 static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl, u8 num_ctrl)
93 list_for_each_entry(hdev, &hci_dev_list, list) {
94 /* Iterate through AMP controllers */
95 if (hdev->id == HCI_BREDR_ID)
98 /* Starting from second entry */
103 cl[i].type = hdev->amp_type;
104 cl[i].status = hdev->amp_status;
108 /* Processing A2MP messages */
109 static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb,
110 struct a2mp_cmd *hdr)
112 struct a2mp_cmd_rej *rej = (void *) skb->data;
114 if (le16_to_cpu(hdr->len) < sizeof(*rej))
117 BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason));
119 skb_pull(skb, sizeof(*rej));
124 static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
125 struct a2mp_cmd *hdr)
127 struct a2mp_discov_req *req = (void *) skb->data;
128 u16 len = le16_to_cpu(hdr->len);
129 struct a2mp_discov_rsp *rsp;
133 if (len < sizeof(*req))
136 skb_pull(skb, sizeof(*req));
138 ext_feat = le16_to_cpu(req->ext_feat);
140 BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat);
142 /* check that packet is not broken for now */
143 while (ext_feat & A2MP_FEAT_EXT) {
144 if (len < sizeof(ext_feat))
147 ext_feat = get_unaligned_le16(skb->data);
148 BT_DBG("efm 0x%4.4x", ext_feat);
149 len -= sizeof(ext_feat);
150 skb_pull(skb, sizeof(ext_feat));
153 read_lock(&hci_dev_list_lock);
155 num_ctrl = __hci_num_ctrl();
156 len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp);
157 rsp = kmalloc(len, GFP_ATOMIC);
159 read_unlock(&hci_dev_list_lock);
163 rsp->mtu = __constant_cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
166 __a2mp_add_cl(mgr, rsp->cl, num_ctrl);
168 read_unlock(&hci_dev_list_lock);
170 a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
176 static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
177 struct a2mp_cmd *hdr)
179 struct a2mp_discov_rsp *rsp = (void *) skb->data;
180 u16 len = le16_to_cpu(hdr->len);
185 if (len < sizeof(*rsp))
189 skb_pull(skb, sizeof(*rsp));
191 ext_feat = le16_to_cpu(rsp->ext_feat);
193 BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat);
195 /* check that packet is not broken for now */
196 while (ext_feat & A2MP_FEAT_EXT) {
197 if (len < sizeof(ext_feat))
200 ext_feat = get_unaligned_le16(skb->data);
201 BT_DBG("efm 0x%4.4x", ext_feat);
202 len -= sizeof(ext_feat);
203 skb_pull(skb, sizeof(ext_feat));
206 cl = (void *) skb->data;
207 while (len >= sizeof(*cl)) {
208 BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type,
211 if (cl->id != HCI_BREDR_ID && cl->type == HCI_AMP) {
212 struct a2mp_info_req req;
216 a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
221 cl = (void *) skb_pull(skb, sizeof(*cl));
224 /* Fall back to L2CAP init sequence */
226 struct l2cap_conn *conn = mgr->l2cap_conn;
227 struct l2cap_chan *chan;
229 mutex_lock(&conn->chan_lock);
231 list_for_each_entry(chan, &conn->chan_l, list) {
233 BT_DBG("chan %p state %s", chan,
234 state_to_string(chan->state));
236 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP)
239 l2cap_chan_lock(chan);
241 if (chan->state == BT_CONNECT)
242 l2cap_send_conn_req(chan);
244 l2cap_chan_unlock(chan);
247 mutex_unlock(&conn->chan_lock);
253 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
254 struct a2mp_cmd *hdr)
256 struct a2mp_cl *cl = (void *) skb->data;
258 while (skb->len >= sizeof(*cl)) {
259 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
261 cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl));
264 /* TODO send A2MP_CHANGE_RSP */
269 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
270 struct a2mp_cmd *hdr)
272 struct a2mp_info_req *req = (void *) skb->data;
273 struct hci_dev *hdev;
275 if (le16_to_cpu(hdr->len) < sizeof(*req))
278 BT_DBG("id %d", req->id);
280 hdev = hci_dev_get(req->id);
282 struct a2mp_info_rsp rsp;
285 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
287 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
291 if (hdev->dev_type != HCI_BREDR) {
292 mgr->state = READ_LOC_AMP_INFO;
293 hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
298 skb_pull(skb, sizeof(*req));
302 static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
303 struct a2mp_cmd *hdr)
305 struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data;
306 struct a2mp_amp_assoc_req req;
307 struct amp_ctrl *ctrl;
309 if (le16_to_cpu(hdr->len) < sizeof(*rsp))
312 BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status);
317 ctrl = amp_ctrl_add(mgr);
324 a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req),
327 skb_pull(skb, sizeof(*rsp));
331 static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
332 struct a2mp_cmd *hdr)
334 struct a2mp_amp_assoc_req *req = (void *) skb->data;
335 struct hci_dev *hdev;
338 if (le16_to_cpu(hdr->len) < sizeof(*req))
341 BT_DBG("id %d", req->id);
343 /* Make sure that other request is not processed */
344 tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
346 hdev = hci_dev_get(req->id);
347 if (!hdev || hdev->amp_type == HCI_BREDR || tmp) {
348 struct a2mp_amp_assoc_rsp rsp;
352 rsp.status = A2MP_STATUS_COLLISION_OCCURED;
355 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
358 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
364 amp_read_loc_assoc(hdev, mgr);
370 skb_pull(skb, sizeof(*req));
374 static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
375 struct a2mp_cmd *hdr)
377 struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data;
378 u16 len = le16_to_cpu(hdr->len);
379 struct hci_dev *hdev;
380 struct amp_ctrl *ctrl;
381 struct hci_conn *hcon;
383 if (len < sizeof(*rsp))
386 BT_DBG("id %d status 0x%2.2x assoc len %u", rsp->id, rsp->status,
392 /* Save remote ASSOC data */
393 ctrl = amp_ctrl_lookup(mgr, rsp->id);
395 u8 *assoc, assoc_len = len - sizeof(*rsp);
397 assoc = kzalloc(assoc_len, GFP_KERNEL);
403 memcpy(assoc, rsp->amp_assoc, assoc_len);
405 ctrl->assoc_len = assoc_len;
406 ctrl->assoc_rem_len = assoc_len;
407 ctrl->assoc_len_so_far = 0;
412 /* Create Phys Link */
413 hdev = hci_dev_get(rsp->id);
417 hcon = phylink_add(hdev, mgr, rsp->id);
421 BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id);
423 mgr->bredr_chan->ctrl_id = rsp->id;
425 amp_create_phylink(hdev, mgr, hcon);
433 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
434 struct a2mp_cmd *hdr)
436 struct a2mp_physlink_req *req = (void *) skb->data;
438 struct a2mp_physlink_rsp rsp;
439 struct hci_dev *hdev;
440 struct hci_conn *hcon;
442 if (le16_to_cpu(hdr->len) < sizeof(*req))
445 BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
447 rsp.local_id = req->remote_id;
448 rsp.remote_id = req->local_id;
450 hdev = hci_dev_get(req->remote_id);
451 if (!hdev || hdev->amp_type != HCI_AMP) {
452 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
456 /* TODO process physlink create */
458 hcon = phylink_add(hdev, mgr, req->local_id);
460 BT_DBG("hcon %p", hcon);
462 rsp.status = A2MP_STATUS_SUCCESS;
464 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
471 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident, sizeof(rsp),
474 skb_pull(skb, le16_to_cpu(hdr->len));
478 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
479 struct a2mp_cmd *hdr)
481 struct a2mp_physlink_req *req = (void *) skb->data;
482 struct a2mp_physlink_rsp rsp;
483 struct hci_dev *hdev;
484 struct hci_conn *hcon;
486 if (le16_to_cpu(hdr->len) < sizeof(*req))
489 BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
491 rsp.local_id = req->remote_id;
492 rsp.remote_id = req->local_id;
493 rsp.status = A2MP_STATUS_SUCCESS;
495 hdev = hci_dev_get(req->remote_id);
497 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
501 hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, mgr->l2cap_conn->dst);
503 BT_ERR("No phys link exist");
504 rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
508 /* TODO Disconnect Phys Link here */
514 a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
516 skb_pull(skb, sizeof(*req));
520 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
521 struct a2mp_cmd *hdr)
523 BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
525 skb_pull(skb, le16_to_cpu(hdr->len));
529 /* Handle A2MP signalling */
530 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
532 struct a2mp_cmd *hdr;
533 struct amp_mgr *mgr = chan->data;
538 while (skb->len >= sizeof(*hdr)) {
541 hdr = (void *) skb->data;
542 len = le16_to_cpu(hdr->len);
544 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
546 skb_pull(skb, sizeof(*hdr));
548 if (len > skb->len || !hdr->ident) {
553 mgr->ident = hdr->ident;
556 case A2MP_COMMAND_REJ:
557 a2mp_command_rej(mgr, skb, hdr);
560 case A2MP_DISCOVER_REQ:
561 err = a2mp_discover_req(mgr, skb, hdr);
564 case A2MP_CHANGE_NOTIFY:
565 err = a2mp_change_notify(mgr, skb, hdr);
568 case A2MP_GETINFO_REQ:
569 err = a2mp_getinfo_req(mgr, skb, hdr);
572 case A2MP_GETAMPASSOC_REQ:
573 err = a2mp_getampassoc_req(mgr, skb, hdr);
576 case A2MP_CREATEPHYSLINK_REQ:
577 err = a2mp_createphyslink_req(mgr, skb, hdr);
580 case A2MP_DISCONNPHYSLINK_REQ:
581 err = a2mp_discphyslink_req(mgr, skb, hdr);
584 case A2MP_DISCOVER_RSP:
585 err = a2mp_discover_rsp(mgr, skb, hdr);
588 case A2MP_GETINFO_RSP:
589 err = a2mp_getinfo_rsp(mgr, skb, hdr);
592 case A2MP_GETAMPASSOC_RSP:
593 err = a2mp_getampassoc_rsp(mgr, skb, hdr);
596 case A2MP_CHANGE_RSP:
597 case A2MP_CREATEPHYSLINK_RSP:
598 case A2MP_DISCONNPHYSLINK_RSP:
599 err = a2mp_cmd_rsp(mgr, skb, hdr);
603 BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
610 struct a2mp_cmd_rej rej;
612 rej.reason = __constant_cpu_to_le16(0);
613 hdr = (void *) skb->data;
615 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
617 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
621 /* Always free skb and return success error code to prevent
622 from sending L2CAP Disconnect over A2MP channel */
630 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
632 l2cap_chan_put(chan);
635 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state)
637 struct amp_mgr *mgr = chan->data;
642 BT_DBG("chan %p state %s", chan, state_to_string(state));
654 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
655 unsigned long len, int nb)
657 return bt_skb_alloc(len, GFP_KERNEL);
660 static struct l2cap_ops a2mp_chan_ops = {
661 .name = "L2CAP A2MP channel",
662 .recv = a2mp_chan_recv_cb,
663 .close = a2mp_chan_close_cb,
664 .state_change = a2mp_chan_state_change_cb,
665 .alloc_skb = a2mp_chan_alloc_skb_cb,
667 /* Not implemented for A2MP */
668 .new_connection = l2cap_chan_no_new_connection,
669 .teardown = l2cap_chan_no_teardown,
670 .ready = l2cap_chan_no_ready,
673 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
675 struct l2cap_chan *chan;
678 chan = l2cap_chan_create();
682 BT_DBG("chan %p", chan);
684 chan->chan_type = L2CAP_CHAN_CONN_FIX_A2MP;
685 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
687 chan->ops = &a2mp_chan_ops;
689 l2cap_chan_set_defaults(chan);
690 chan->remote_max_tx = chan->max_tx;
691 chan->remote_tx_win = chan->tx_win;
693 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
694 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
696 skb_queue_head_init(&chan->tx_q);
698 chan->mode = L2CAP_MODE_ERTM;
700 err = l2cap_ertm_init(chan);
702 l2cap_chan_del(chan, 0);
706 chan->conf_state = 0;
709 __l2cap_chan_add(conn, chan);
711 l2cap_chan_add(conn, chan);
713 chan->remote_mps = chan->omtu;
714 chan->mps = chan->omtu;
716 chan->state = BT_CONNECTED;
721 /* AMP Manager functions */
722 void amp_mgr_get(struct amp_mgr *mgr)
724 BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
726 kref_get(&mgr->kref);
729 static void amp_mgr_destroy(struct kref *kref)
731 struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
733 BT_DBG("mgr %p", mgr);
735 mutex_lock(&_mgr_list_lock);
736 list_del(&mgr->list);
737 mutex_unlock(&_mgr_list_lock);
739 amp_ctrl_list_flush(mgr);
743 int amp_mgr_put(struct amp_mgr *mgr)
745 BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
747 return kref_put(&mgr->kref, &_mgr_destroy);
750 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
753 struct l2cap_chan *chan;
755 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
759 BT_DBG("conn %p mgr %p", conn, mgr);
761 mgr->l2cap_conn = conn;
763 chan = a2mp_chan_open(conn, locked);
769 mgr->a2mp_chan = chan;
772 conn->hcon->amp_mgr = mgr;
774 kref_init(&mgr->kref);
776 /* Remote AMP ctrl list initialization */
777 INIT_LIST_HEAD(&mgr->amp_ctrls);
778 mutex_init(&mgr->amp_ctrls_lock);
780 mutex_lock(&_mgr_list_lock);
781 list_add(&mgr->list, &_mgr_list);
782 mutex_unlock(&_mgr_list_lock);
787 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
792 mgr = amp_mgr_create(conn, false);
794 BT_ERR("Could not create AMP manager");
798 BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
800 return mgr->a2mp_chan;
803 struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
807 mutex_lock(&_mgr_list_lock);
808 list_for_each_entry(mgr, &_mgr_list, list) {
809 if (mgr->state == state) {
811 mutex_unlock(&_mgr_list_lock);
815 mutex_unlock(&_mgr_list_lock);
820 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
823 struct a2mp_info_rsp rsp;
825 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
829 BT_DBG("%s mgr %p", hdev->name, mgr);
832 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
834 if (hdev->amp_type != HCI_BREDR) {
836 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
837 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
838 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
839 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
840 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
843 a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
847 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
850 struct amp_assoc *loc_assoc = &hdev->loc_assoc;
851 struct a2mp_amp_assoc_rsp *rsp;
854 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
858 BT_DBG("%s mgr %p", hdev->name, mgr);
860 len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
861 rsp = kzalloc(len, GFP_KERNEL);
870 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
872 rsp->status = A2MP_STATUS_SUCCESS;
873 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
876 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
881 void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
884 struct amp_assoc *loc_assoc = &hdev->loc_assoc;
885 struct a2mp_physlink_req *req;
886 struct l2cap_chan *bredr_chan;
889 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
893 len = sizeof(*req) + loc_assoc->len;
895 BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
897 req = kzalloc(len, GFP_KERNEL);
903 bredr_chan = mgr->bredr_chan;
907 req->local_id = hdev->id;
908 req->remote_id = bredr_chan->ctrl_id;
909 memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
911 a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
918 void a2mp_discover_amp(struct l2cap_chan *chan)
920 struct l2cap_conn *conn = chan->conn;
921 struct amp_mgr *mgr = conn->hcon->amp_mgr;
922 struct a2mp_discov_req req;
924 BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
927 mgr = amp_mgr_create(conn, true);
932 mgr->bredr_chan = chan;
934 req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
936 a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);