[linux.git] / net / bluetooth / amp.c

/*
   Copyright (c) 2011,2012 Intel Corp.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 and
   only version 2 as published by the Free Software Foundation.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
*/

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci.h>
#include <net/bluetooth/hci_core.h>
#include <crypto/hash.h>

#include "a2mp.h"
#include "amp.h"

/* Remote AMP Controllers interface */
void amp_ctrl_get(struct amp_ctrl *ctrl)
{
	BT_DBG("ctrl %p orig refcnt %d", ctrl,
	       atomic_read(&ctrl->kref.refcount));

	kref_get(&ctrl->kref);
}

static void amp_ctrl_destroy(struct kref *kref)
{
	struct amp_ctrl *ctrl = container_of(kref, struct amp_ctrl, kref);

	BT_DBG("ctrl %p", ctrl);

	kfree(ctrl->assoc);
	kfree(ctrl);
}

int amp_ctrl_put(struct amp_ctrl *ctrl)
{
	BT_DBG("ctrl %p orig refcnt %d", ctrl,
	       atomic_read(&ctrl->kref.refcount));

	return kref_put(&ctrl->kref, &amp_ctrl_destroy);
}

struct amp_ctrl *amp_ctrl_add(struct amp_mgr *mgr, u8 id)
{
	struct amp_ctrl *ctrl;

	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
	if (!ctrl)
		return NULL;

	kref_init(&ctrl->kref);
	ctrl->id = id;

	mutex_lock(&mgr->amp_ctrls_lock);
	list_add(&ctrl->list, &mgr->amp_ctrls);
	mutex_unlock(&mgr->amp_ctrls_lock);

	BT_DBG("mgr %p ctrl %p", mgr, ctrl);

	return ctrl;
}

void amp_ctrl_list_flush(struct amp_mgr *mgr)
{
	struct amp_ctrl *ctrl, *n;

	BT_DBG("mgr %p", mgr);

	mutex_lock(&mgr->amp_ctrls_lock);
	list_for_each_entry_safe(ctrl, n, &mgr->amp_ctrls, list) {
		list_del(&ctrl->list);
		amp_ctrl_put(ctrl);
	}
	mutex_unlock(&mgr->amp_ctrls_lock);
}

struct amp_ctrl *amp_ctrl_lookup(struct amp_mgr *mgr, u8 id)
{
	struct amp_ctrl *ctrl;

	BT_DBG("mgr %p id %d", mgr, id);

	mutex_lock(&mgr->amp_ctrls_lock);
	list_for_each_entry(ctrl, &mgr->amp_ctrls, list) {
		if (ctrl->id == id) {
			amp_ctrl_get(ctrl);
			mutex_unlock(&mgr->amp_ctrls_lock);
			return ctrl;
		}
	}
	mutex_unlock(&mgr->amp_ctrls_lock);

	return NULL;
}

/* Physical Link interface */
static u8 __next_handle(struct amp_mgr *mgr)
{
	if (++mgr->handle == 0)
		mgr->handle = 1;

	return mgr->handle;
}

struct hci_conn *phylink_add(struct hci_dev *hdev, struct amp_mgr *mgr,
			     u8 remote_id, bool out)
{
	bdaddr_t *dst = &mgr->l2cap_conn->hcon->dst;
	struct hci_conn *hcon;
	u8 role = out ? HCI_ROLE_MASTER : HCI_ROLE_SLAVE;

	hcon = hci_conn_add(hdev, AMP_LINK, dst, role);
	if (!hcon)
		return NULL;

	BT_DBG("hcon %p dst %pMR", hcon, dst);

	hcon->state = BT_CONNECT;
	hcon->attempt++;
	hcon->handle = __next_handle(mgr);
	hcon->remote_id = remote_id;
	hcon->amp_mgr = amp_mgr_get(mgr);

	return hcon;
}

/* AMP crypto key generation interface */
static int hmac_sha256(u8 *key, u8 ksize, char *plaintext, u8 psize, u8 *output)
{
	struct crypto_shash *tfm;
	struct shash_desc *shash;
	int ret;

	if (!ksize)
		return -EINVAL;

	tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
	if (IS_ERR(tfm)) {
		BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
		return PTR_ERR(tfm);
	}

	ret = crypto_shash_setkey(tfm, key, ksize);
	if (ret) {
		BT_DBG("crypto_ahash_setkey failed: err %d", ret);
		goto failed;
	}

	shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm),
			GFP_KERNEL);
	if (!shash) {
		ret = -ENOMEM;
		goto failed;
	}

	shash->tfm = tfm;
	shash->flags = CRYPTO_TFM_REQ_MAY_SLEEP;

	ret = crypto_shash_digest(shash, plaintext, psize, output);

	kfree(shash);

failed:
	crypto_free_shash(tfm);
	return ret;
}

int phylink_gen_key(struct hci_conn *conn, u8 *data, u8 *len, u8 *type)
{
	struct hci_dev *hdev = conn->hdev;
	struct link_key *key;
	u8 keybuf[HCI_AMP_LINK_KEY_SIZE];
	u8 gamp_key[HCI_AMP_LINK_KEY_SIZE];
	int err;

	if (!hci_conn_check_link_mode(conn))
		return -EACCES;

	BT_DBG("conn %p key_type %d", conn, conn->key_type);

	/* Legacy key */
	if (conn->key_type < 3) {
		BT_ERR("Legacy key type %d", conn->key_type);
		return -EACCES;
	}

	*type = conn->key_type;
	*len = HCI_AMP_LINK_KEY_SIZE;

	key = hci_find_link_key(hdev, &conn->dst);
	if (!key) {
		BT_DBG("No Link key for conn %p dst %pMR", conn, &conn->dst);
		return -EACCES;
	}

	/* BR/EDR Link Key concatenated together with itself */
	memcpy(&keybuf[0], key->val, HCI_LINK_KEY_SIZE);
	memcpy(&keybuf[HCI_LINK_KEY_SIZE], key->val, HCI_LINK_KEY_SIZE);

	/* Derive Generic AMP Link Key (gamp) */
	err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
	if (err) {
		BT_ERR("Could not derive Generic AMP Key: err %d", err);
		return err;
	}

	if (conn->key_type == HCI_LK_DEBUG_COMBINATION) {
		BT_DBG("Use Generic AMP Key (gamp)");
		memcpy(data, gamp_key, HCI_AMP_LINK_KEY_SIZE);
		return err;
	}

	/* Derive Dedicated AMP Link Key: "802b" is 802.11 PAL keyID */
	return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
}

void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
{
	struct hci_cp_read_local_amp_assoc cp;
	struct amp_assoc *loc_assoc = &hdev->loc_assoc;

	BT_DBG("%s handle %d", hdev->name, phy_handle);

	cp.phy_handle = phy_handle;
	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	cp.len_so_far = cpu_to_le16(loc_assoc->offset);

	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
}

void amp_read_loc_assoc(struct hci_dev *hdev, struct amp_mgr *mgr)
{
	struct hci_cp_read_local_amp_assoc cp;

	memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
	memset(&cp, 0, sizeof(cp));

	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);

	set_bit(READ_LOC_AMP_ASSOC, &mgr->state);
	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
}

void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
				   struct hci_conn *hcon)
{
	struct hci_cp_read_local_amp_assoc cp;
	struct amp_mgr *mgr = hcon->amp_mgr;

	cp.phy_handle = hcon->handle;
	cp.len_so_far = cpu_to_le16(0);
	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);

	set_bit(READ_LOC_AMP_ASSOC_FINAL, &mgr->state);

	/* Read Local AMP Assoc final link information data */
	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
}

/* Write AMP Assoc data fragments, returns true with last fragment written*/
static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
				     struct hci_conn *hcon)
{
	struct hci_cp_write_remote_amp_assoc *cp;
	struct amp_mgr *mgr = hcon->amp_mgr;
	struct amp_ctrl *ctrl;
	u16 frag_len, len;

	ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
	if (!ctrl)
		return false;

	if (!ctrl->assoc_rem_len) {
		BT_DBG("all fragments are written");
		ctrl->assoc_rem_len = ctrl->assoc_len;
		ctrl->assoc_len_so_far = 0;

		amp_ctrl_put(ctrl);
		return true;
	}

	frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
	len = frag_len + sizeof(*cp);

	cp = kzalloc(len, GFP_KERNEL);
	if (!cp) {
		amp_ctrl_put(ctrl);
		return false;
	}

	BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
	       hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);

	cp->phy_handle = hcon->handle;
	cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
	cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
	memcpy(cp->frag, ctrl->assoc, frag_len);

	ctrl->assoc_len_so_far += frag_len;
	ctrl->assoc_rem_len -= frag_len;

	amp_ctrl_put(ctrl);

	hci_send_cmd(hdev, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);

	kfree(cp);

	return false;
}

void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
{
	struct hci_conn *hcon;

	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);

	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	if (!hcon)
		return;

	/* Send A2MP create phylink rsp when all fragments are written */
	if (amp_write_rem_assoc_frag(hdev, hcon))
		a2mp_send_create_phy_link_rsp(hdev, 0);
}

void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
{
	struct hci_conn *hcon;

	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);

	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	if (!hcon)
		return;

	BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);

	amp_write_rem_assoc_frag(hdev, hcon);
}

void amp_create_phylink(struct hci_dev *hdev, struct amp_mgr *mgr,
			struct hci_conn *hcon)
{
	struct hci_cp_create_phy_link cp;

	cp.phy_handle = hcon->handle;

	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	       hcon->handle);

	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
			    &cp.key_type)) {
		BT_DBG("Cannot create link key");
		return;
	}

	hci_send_cmd(hdev, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
}

void amp_accept_phylink(struct hci_dev *hdev, struct amp_mgr *mgr,
			struct hci_conn *hcon)
{
	struct hci_cp_accept_phy_link cp;

	cp.phy_handle = hcon->handle;

	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	       hcon->handle);

	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
			    &cp.key_type)) {
		BT_DBG("Cannot create link key");
		return;
	}

	hci_send_cmd(hdev, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
}

void amp_physical_cfm(struct hci_conn *bredr_hcon, struct hci_conn *hs_hcon)
{
	struct hci_dev *bredr_hdev = hci_dev_hold(bredr_hcon->hdev);
	struct amp_mgr *mgr = hs_hcon->amp_mgr;
	struct l2cap_chan *bredr_chan;

	BT_DBG("bredr_hcon %p hs_hcon %p mgr %p", bredr_hcon, hs_hcon, mgr);

	if (!bredr_hdev || !mgr || !mgr->bredr_chan)
		return;

	bredr_chan = mgr->bredr_chan;

	l2cap_chan_lock(bredr_chan);

	set_bit(FLAG_EFS_ENABLE, &bredr_chan->flags);
	bredr_chan->remote_amp_id = hs_hcon->remote_id;
	bredr_chan->local_amp_id = hs_hcon->hdev->id;
	bredr_chan->hs_hcon = hs_hcon;
	bredr_chan->conn->mtu = hs_hcon->hdev->block_mtu;

	__l2cap_physical_cfm(bredr_chan, 0);

	l2cap_chan_unlock(bredr_chan);

	hci_dev_put(bredr_hdev);
}

void amp_create_logical_link(struct l2cap_chan *chan)
{
	struct hci_conn *hs_hcon = chan->hs_hcon;
	struct hci_cp_create_accept_logical_link cp;
	struct hci_dev *hdev;

	BT_DBG("chan %p hs_hcon %p dst %pMR", chan, hs_hcon,
	       &chan->conn->hcon->dst);

	if (!hs_hcon)
		return;

	hdev = hci_dev_hold(chan->hs_hcon->hdev);
	if (!hdev)
		return;

	cp.phy_handle = hs_hcon->handle;

	cp.tx_flow_spec.id = chan->local_id;
	cp.tx_flow_spec.stype = chan->local_stype;
	cp.tx_flow_spec.msdu = cpu_to_le16(chan->local_msdu);
	cp.tx_flow_spec.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
	cp.tx_flow_spec.acc_lat = cpu_to_le32(chan->local_acc_lat);
	cp.tx_flow_spec.flush_to = cpu_to_le32(chan->local_flush_to);

	cp.rx_flow_spec.id = chan->remote_id;
	cp.rx_flow_spec.stype = chan->remote_stype;
	cp.rx_flow_spec.msdu = cpu_to_le16(chan->remote_msdu);
	cp.rx_flow_spec.sdu_itime = cpu_to_le32(chan->remote_sdu_itime);
	cp.rx_flow_spec.acc_lat = cpu_to_le32(chan->remote_acc_lat);
	cp.rx_flow_spec.flush_to = cpu_to_le32(chan->remote_flush_to);

	if (hs_hcon->out)
		hci_send_cmd(hdev, HCI_OP_CREATE_LOGICAL_LINK, sizeof(cp),
			     &cp);
	else
		hci_send_cmd(hdev, HCI_OP_ACCEPT_LOGICAL_LINK, sizeof(cp),
			     &cp);

	hci_dev_put(hdev);
}

void amp_disconnect_logical_link(struct hci_chan *hchan)
{
	struct hci_conn *hcon = hchan->conn;
	struct hci_cp_disconn_logical_link cp;

	if (hcon->state != BT_CONNECTED) {
		BT_DBG("hchan %p not connected", hchan);
		return;
	}

	cp.log_handle = cpu_to_le16(hchan->handle);
	hci_send_cmd(hcon->hdev, HCI_OP_DISCONN_LOGICAL_LINK, sizeof(cp), &cp);
}

void amp_destroy_logical_link(struct hci_chan *hchan, u8 reason)
{
	BT_DBG("hchan %p", hchan);

	hci_chan_del(hchan);
}
Commit	Line	Data
903e4541 AE	1	/*
	2	Copyright (c) 2011,2012 Intel Corp.
	3
	4	This program is free software; you can redistribute it and/or modify
	5	it under the terms of the GNU General Public License version 2 and
	6	only version 2 as published by the Free Software Foundation.
	7
	8	This program is distributed in the hope that it will be useful,
	9	but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	GNU General Public License for more details.
	12	*/
	13
	14	#include <net/bluetooth/bluetooth.h>
	15	#include <net/bluetooth/hci.h>
	16	#include <net/bluetooth/hci_core.h>
ba221bba	17	#include <crypto/hash.h>
903e4541	18
7024728e	19	#include "a2mp.h"
7ef9fbf0 MH	20	#include "amp.h"
7ef9fbf0 MH	21
52c0d6e5	22	/* Remote AMP Controllers interface */
0b26ab9d	23	void amp_ctrl_get(struct amp_ctrl *ctrl)
52c0d6e5 AE	24	{
	25	BT_DBG("ctrl %p orig refcnt %d", ctrl,
	26	atomic_read(&ctrl->kref.refcount));
	27
	28	kref_get(&ctrl->kref);
	29	}
	30
	31	static void amp_ctrl_destroy(struct kref *kref)
	32	{
	33	struct amp_ctrl *ctrl = container_of(kref, struct amp_ctrl, kref);
	34
	35	BT_DBG("ctrl %p", ctrl);
	36
	37	kfree(ctrl->assoc);
	38	kfree(ctrl);
	39	}
	40
	41	int amp_ctrl_put(struct amp_ctrl *ctrl)
	42	{
	43	BT_DBG("ctrl %p orig refcnt %d", ctrl,
	44	atomic_read(&ctrl->kref.refcount));
	45
	46	return kref_put(&ctrl->kref, &amp_ctrl_destroy);
	47	}
	48
fa4ebc66	49	struct amp_ctrl amp_ctrl_add(struct amp_mgr mgr, u8 id)
52c0d6e5 AE	50	{
	51	struct amp_ctrl *ctrl;
	52
	53	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
	54	if (!ctrl)
	55	return NULL;
	56
fa4ebc66 AE	57	kref_init(&ctrl->kref);
	58	ctrl->id = id;
	59
52c0d6e5 AE	60	mutex_lock(&mgr->amp_ctrls_lock);
	61	list_add(&ctrl->list, &mgr->amp_ctrls);
	62	mutex_unlock(&mgr->amp_ctrls_lock);
	63
52c0d6e5 AE	64	BT_DBG("mgr %p ctrl %p", mgr, ctrl);
	65
	66	return ctrl;
	67	}
	68
	69	void amp_ctrl_list_flush(struct amp_mgr *mgr)
	70	{
	71	struct amp_ctrl ctrl, n;
	72
	73	BT_DBG("mgr %p", mgr);
	74
	75	mutex_lock(&mgr->amp_ctrls_lock);
	76	list_for_each_entry_safe(ctrl, n, &mgr->amp_ctrls, list) {
	77	list_del(&ctrl->list);
	78	amp_ctrl_put(ctrl);
	79	}
	80	mutex_unlock(&mgr->amp_ctrls_lock);
	81	}
	82
	83	struct amp_ctrl amp_ctrl_lookup(struct amp_mgr mgr, u8 id)
	84	{
	85	struct amp_ctrl *ctrl;
	86
	87	BT_DBG("mgr %p id %d", mgr, id);
	88
	89	mutex_lock(&mgr->amp_ctrls_lock);
	90	list_for_each_entry(ctrl, &mgr->amp_ctrls, list) {
	91	if (ctrl->id == id) {
	92	amp_ctrl_get(ctrl);
	93	mutex_unlock(&mgr->amp_ctrls_lock);
	94	return ctrl;
	95	}
	96	}
	97	mutex_unlock(&mgr->amp_ctrls_lock);
	98
	99	return NULL;
	100	}
	101
3161ae1c AE	102	/* Physical Link interface */
	103	static u8 __next_handle(struct amp_mgr *mgr)
	104	{
	105	if (++mgr->handle == 0)
	106	mgr->handle = 1;
	107
	108	return mgr->handle;
	109	}
	110
	111	struct hci_conn phylink_add(struct hci_dev hdev, struct amp_mgr *mgr,
a0c234fe	112	u8 remote_id, bool out)
3161ae1c	113	{
bdc8ead2	114	bdaddr_t *dst = &mgr->l2cap_conn->hcon->dst;
3161ae1c	115	struct hci_conn *hcon;
a5c4e309	116	u8 role = out ? HCI_ROLE_MASTER : HCI_ROLE_SLAVE;
3161ae1c	117
a5c4e309	118	hcon = hci_conn_add(hdev, AMP_LINK, dst, role);
3161ae1c AE	119	if (!hcon)
	120	return NULL;
	121
a0c234fe AE	122	BT_DBG("hcon %p dst %pMR", hcon, dst);
a0c234fe AE	123
3161ae1c	124	hcon->state = BT_CONNECT;
3161ae1c AE	125	hcon->attempt++;
	126	hcon->handle = __next_handle(mgr);
	127	hcon->remote_id = remote_id;
f706adfe	128	hcon->amp_mgr = amp_mgr_get(mgr);
3161ae1c AE	129
	130	return hcon;
	131	}
	132
ba221bba DK	133	/* AMP crypto key generation interface */
	134	static int hmac_sha256(u8 key, u8 ksize, char plaintext, u8 psize, u8 *output)
	135	{
ba221bba	136	struct crypto_shash *tfm;
252670c4	137	struct shash_desc *shash;
0a961a44	138	int ret;
ba221bba DK	139
	140	if (!ksize)
	141	return -EINVAL;
	142
	143	tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
	144	if (IS_ERR(tfm)) {
	145	BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
	146	return PTR_ERR(tfm);
	147	}
	148
	149	ret = crypto_shash_setkey(tfm, key, ksize);
	150	if (ret) {
	151	BT_DBG("crypto_ahash_setkey failed: err %d", ret);
252670c4 JH	152	goto failed;
252670c4 JH	153	}
ba221bba	154
252670c4 JH	155	shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm),
	156	GFP_KERNEL);
	157	if (!shash) {
	158	ret = -ENOMEM;
	159	goto failed;
ba221bba DK	160	}
ba221bba DK	161
252670c4 JH	162	shash->tfm = tfm;
	163	shash->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
	164
	165	ret = crypto_shash_digest(shash, plaintext, psize, output);
	166
	167	kfree(shash);
	168
	169	failed:
ba221bba DK	170	crypto_free_shash(tfm);
	171	return ret;
	172	}
	173
5a349186 AE	174	int phylink_gen_key(struct hci_conn conn, u8 data, u8 len, u8 type)
	175	{
	176	struct hci_dev *hdev = conn->hdev;
	177	struct link_key *key;
	178	u8 keybuf[HCI_AMP_LINK_KEY_SIZE];
	179	u8 gamp_key[HCI_AMP_LINK_KEY_SIZE];
	180	int err;
	181
	182	if (!hci_conn_check_link_mode(conn))
	183	return -EACCES;
	184
	185	BT_DBG("conn %p key_type %d", conn, conn->key_type);
	186
	187	/* Legacy key */
	188	if (conn->key_type < 3) {
	189	BT_ERR("Legacy key type %d", conn->key_type);
	190	return -EACCES;
	191	}
	192
	193	*type = conn->key_type;
	194	*len = HCI_AMP_LINK_KEY_SIZE;
	195
	196	key = hci_find_link_key(hdev, &conn->dst);
079db0c6 AE	197	if (!key) {
	198	BT_DBG("No Link key for conn %p dst %pMR", conn, &conn->dst);
	199	return -EACCES;
	200	}
5a349186 AE	201
	202	/* BR/EDR Link Key concatenated together with itself */
	203	memcpy(&keybuf[0], key->val, HCI_LINK_KEY_SIZE);
	204	memcpy(&keybuf[HCI_LINK_KEY_SIZE], key->val, HCI_LINK_KEY_SIZE);
	205
	206	/* Derive Generic AMP Link Key (gamp) */
	207	err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
	208	if (err) {
	209	BT_ERR("Could not derive Generic AMP Key: err %d", err);
	210	return err;
	211	}
	212
	213	if (conn->key_type == HCI_LK_DEBUG_COMBINATION) {
	214	BT_DBG("Use Generic AMP Key (gamp)");
	215	memcpy(data, gamp_key, HCI_AMP_LINK_KEY_SIZE);
	216	return err;
	217	}
	218
	219	/* Derive Dedicated AMP Link Key: "802b" is 802.11 PAL keyID */
	220	return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
	221	}
	222
903e4541 AE	223	void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
	224	{
	225	struct hci_cp_read_local_amp_assoc cp;
	226	struct amp_assoc *loc_assoc = &hdev->loc_assoc;
	227
	228	BT_DBG("%s handle %d", hdev->name, phy_handle);
	229
	230	cp.phy_handle = phy_handle;
	231	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	232	cp.len_so_far = cpu_to_le16(loc_assoc->offset);
	233
	234	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	235	}
	236
	237	void amp_read_loc_assoc(struct hci_dev hdev, struct amp_mgr mgr)
	238	{
	239	struct hci_cp_read_local_amp_assoc cp;
	240
	241	memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
	242	memset(&cp, 0, sizeof(cp));
	243
	244	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	245
cb6801c6	246	set_bit(READ_LOC_AMP_ASSOC, &mgr->state);
903e4541 AE	247	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
903e4541 AE	248	}
a02226d6	249
9495b2ee AE	250	void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
	251	struct hci_conn *hcon)
	252	{
	253	struct hci_cp_read_local_amp_assoc cp;
	254	struct amp_mgr *mgr = hcon->amp_mgr;
	255
	256	cp.phy_handle = hcon->handle;
	257	cp.len_so_far = cpu_to_le16(0);
	258	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	259
cb6801c6	260	set_bit(READ_LOC_AMP_ASSOC_FINAL, &mgr->state);
9495b2ee AE	261
	262	/* Read Local AMP Assoc final link information data */
	263	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	264	}
93c284ee AE	265
	266	/* Write AMP Assoc data fragments, returns true with last fragment written*/
	267	static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
	268	struct hci_conn *hcon)
	269	{
	270	struct hci_cp_write_remote_amp_assoc *cp;
	271	struct amp_mgr *mgr = hcon->amp_mgr;
	272	struct amp_ctrl *ctrl;
	273	u16 frag_len, len;
	274
	275	ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
	276	if (!ctrl)
	277	return false;
	278
	279	if (!ctrl->assoc_rem_len) {
	280	BT_DBG("all fragments are written");
	281	ctrl->assoc_rem_len = ctrl->assoc_len;
	282	ctrl->assoc_len_so_far = 0;
	283
	284	amp_ctrl_put(ctrl);
	285	return true;
	286	}
	287
	288	frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
	289	len = frag_len + sizeof(*cp);
	290
	291	cp = kzalloc(len, GFP_KERNEL);
	292	if (!cp) {
	293	amp_ctrl_put(ctrl);
	294	return false;
	295	}
	296
	297	BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
	298	hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);
	299
	300	cp->phy_handle = hcon->handle;
	301	cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
	302	cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
	303	memcpy(cp->frag, ctrl->assoc, frag_len);
	304
	305	ctrl->assoc_len_so_far += frag_len;
	306	ctrl->assoc_rem_len -= frag_len;
	307
	308	amp_ctrl_put(ctrl);
	309
	310	hci_send_cmd(hdev, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
	311
	312	kfree(cp);
	313
	314	return false;
	315	}
	316
	317	void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
	318	{
	319	struct hci_conn *hcon;
	320
	321	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	322
	323	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	324	if (!hcon)
	325	return;
	326
8e05e3ba AE	327	/* Send A2MP create phylink rsp when all fragments are written */
	328	if (amp_write_rem_assoc_frag(hdev, hcon))
	329	a2mp_send_create_phy_link_rsp(hdev, 0);
93c284ee AE	330	}
	331
	332	void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
	333	{
	334	struct hci_conn *hcon;
	335
	336	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	337
	338	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	339	if (!hcon)
	340	return;
	341
	342	BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);
	343
	344	amp_write_rem_assoc_frag(hdev, hcon);
	345	}
	346
a02226d6 AE	347	void amp_create_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	348	struct hci_conn *hcon)
	349	{
	350	struct hci_cp_create_phy_link cp;
	351
	352	cp.phy_handle = hcon->handle;
	353
	354	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	355	hcon->handle);
	356
	357	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	358	&cp.key_type)) {
	359	BT_DBG("Cannot create link key");
	360	return;
	361	}
	362
	363	hci_send_cmd(hdev, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
	364	}
dffa3871 AE	365
	366	void amp_accept_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	367	struct hci_conn *hcon)
	368	{
	369	struct hci_cp_accept_phy_link cp;
	370
	371	cp.phy_handle = hcon->handle;
	372
	373	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	374	hcon->handle);
	375
	376	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	377	&cp.key_type)) {
	378	BT_DBG("Cannot create link key");
	379	return;
	380	}
	381
	382	hci_send_cmd(hdev, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
	383	}
5ce66b59	384
cf70ff22 AE	385	void amp_physical_cfm(struct hci_conn bredr_hcon, struct hci_conn hs_hcon)
	386	{
	387	struct hci_dev *bredr_hdev = hci_dev_hold(bredr_hcon->hdev);
	388	struct amp_mgr *mgr = hs_hcon->amp_mgr;
	389	struct l2cap_chan *bredr_chan;
	390
	391	BT_DBG("bredr_hcon %p hs_hcon %p mgr %p", bredr_hcon, hs_hcon, mgr);
	392
	393	if (!bredr_hdev \|\| !mgr \|\| !mgr->bredr_chan)
	394	return;
	395
	396	bredr_chan = mgr->bredr_chan;
	397
a514b17f AE	398	l2cap_chan_lock(bredr_chan);
a514b17f AE	399
cf70ff22	400	set_bit(FLAG_EFS_ENABLE, &bredr_chan->flags);
fffadc08	401	bredr_chan->remote_amp_id = hs_hcon->remote_id;
37295996	402	bredr_chan->local_amp_id = hs_hcon->hdev->id;
cf70ff22 AE	403	bredr_chan->hs_hcon = hs_hcon;
cf70ff22 AE	404	bredr_chan->conn->mtu = hs_hcon->hdev->block_mtu;
cf70ff22	405
a514b17f AE	406	__l2cap_physical_cfm(bredr_chan, 0);
	407
	408	l2cap_chan_unlock(bredr_chan);
cf70ff22 AE	409
	410	hci_dev_put(bredr_hdev);
	411	}
	412
5ce66b59 AE	413	void amp_create_logical_link(struct l2cap_chan *chan)
5ce66b59 AE	414	{
7a9898c6	415	struct hci_conn *hs_hcon = chan->hs_hcon;
5ce66b59	416	struct hci_cp_create_accept_logical_link cp;
5ce66b59 AE	417	struct hci_dev *hdev;
5ce66b59 AE	418
bdc8ead2 MH	419	BT_DBG("chan %p hs_hcon %p dst %pMR", chan, hs_hcon,
bdc8ead2 MH	420	&chan->conn->hcon->dst);
5ce66b59	421
7a9898c6	422	if (!hs_hcon)
5ce66b59 AE	423	return;
	424
	425	hdev = hci_dev_hold(chan->hs_hcon->hdev);
	426	if (!hdev)
	427	return;
	428
7a9898c6	429	cp.phy_handle = hs_hcon->handle;
5ce66b59 AE	430
	431	cp.tx_flow_spec.id = chan->local_id;
	432	cp.tx_flow_spec.stype = chan->local_stype;
	433	cp.tx_flow_spec.msdu = cpu_to_le16(chan->local_msdu);
	434	cp.tx_flow_spec.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
	435	cp.tx_flow_spec.acc_lat = cpu_to_le32(chan->local_acc_lat);
	436	cp.tx_flow_spec.flush_to = cpu_to_le32(chan->local_flush_to);
	437
	438	cp.rx_flow_spec.id = chan->remote_id;
	439	cp.rx_flow_spec.stype = chan->remote_stype;
	440	cp.rx_flow_spec.msdu = cpu_to_le16(chan->remote_msdu);
	441	cp.rx_flow_spec.sdu_itime = cpu_to_le32(chan->remote_sdu_itime);
	442	cp.rx_flow_spec.acc_lat = cpu_to_le32(chan->remote_acc_lat);
	443	cp.rx_flow_spec.flush_to = cpu_to_le32(chan->remote_flush_to);
	444
7a9898c6	445	if (hs_hcon->out)
5ce66b59 AE	446	hci_send_cmd(hdev, HCI_OP_CREATE_LOGICAL_LINK, sizeof(cp),
	447	&cp);
	448	else
	449	hci_send_cmd(hdev, HCI_OP_ACCEPT_LOGICAL_LINK, sizeof(cp),
	450	&cp);
	451
5ce66b59 AE	452	hci_dev_put(hdev);
5ce66b59 AE	453	}
606e2a10	454
419e08c1 AE	455	void amp_disconnect_logical_link(struct hci_chan *hchan)
	456	{
	457	struct hci_conn *hcon = hchan->conn;
	458	struct hci_cp_disconn_logical_link cp;
	459
	460	if (hcon->state != BT_CONNECTED) {
	461	BT_DBG("hchan %p not connected", hchan);
	462	return;
	463	}
	464
	465	cp.log_handle = cpu_to_le16(hchan->handle);
	466	hci_send_cmd(hcon->hdev, HCI_OP_DISCONN_LOGICAL_LINK, sizeof(cp), &cp);
	467	}
	468
606e2a10 AE	469	void amp_destroy_logical_link(struct hci_chan *hchan, u8 reason)
	470	{
	471	BT_DBG("hchan %p", hchan);
	472
	473	hci_chan_del(hchan);
	474	}