[deliverable/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 <net/bluetooth/a2mp.h>
#include <net/bluetooth/amp.h>
#include <crypto/hash.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)
{
	bdaddr_t *dst = mgr->l2cap_conn->dst;
	struct hci_conn *hcon;

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

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

	return hcon;
}

/* AMP crypto key generation interface */
static int hmac_sha256(u8 *key, u8 ksize, char *plaintext, u8 psize, u8 *output)
{
	int ret = 0;
	struct crypto_shash *tfm;

	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);
	} else {
		struct {
			struct shash_desc shash;
			char ctx[crypto_shash_descsize(tfm)];
		} desc;

		desc.shash.tfm = tfm;
		desc.shash.flags = CRYPTO_TFM_REQ_MAY_SLEEP;

		ret = crypto_shash_digest(&desc.shash, plaintext, psize,
					  output);
	}

	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);

	mgr->state = READ_LOC_AMP_ASSOC;
	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);

	mgr->state = READ_LOC_AMP_ASSOC_FINAL;

	/* 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;

	amp_write_rem_assoc_frag(hdev, hcon);
}

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);
}
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>
	17	#include <net/bluetooth/a2mp.h>
	18	#include <net/bluetooth/amp.h>
ba221bba	19	#include <crypto/hash.h>
903e4541	20
52c0d6e5	21	/* Remote AMP Controllers interface */
0b26ab9d	22	void amp_ctrl_get(struct amp_ctrl *ctrl)
52c0d6e5 AE	23	{
	24	BT_DBG("ctrl %p orig refcnt %d", ctrl,
	25	atomic_read(&ctrl->kref.refcount));
	26
	27	kref_get(&ctrl->kref);
	28	}
	29
	30	static void amp_ctrl_destroy(struct kref *kref)
	31	{
	32	struct amp_ctrl *ctrl = container_of(kref, struct amp_ctrl, kref);
	33
	34	BT_DBG("ctrl %p", ctrl);
	35
	36	kfree(ctrl->assoc);
	37	kfree(ctrl);
	38	}
	39
	40	int amp_ctrl_put(struct amp_ctrl *ctrl)
	41	{
	42	BT_DBG("ctrl %p orig refcnt %d", ctrl,
	43	atomic_read(&ctrl->kref.refcount));
	44
	45	return kref_put(&ctrl->kref, &amp_ctrl_destroy);
	46	}
	47
fa4ebc66	48	struct amp_ctrl amp_ctrl_add(struct amp_mgr mgr, u8 id)
52c0d6e5 AE	49	{
	50	struct amp_ctrl *ctrl;
	51
	52	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
	53	if (!ctrl)
	54	return NULL;
	55
fa4ebc66 AE	56	kref_init(&ctrl->kref);
	57	ctrl->id = id;
	58
52c0d6e5 AE	59	mutex_lock(&mgr->amp_ctrls_lock);
	60	list_add(&ctrl->list, &mgr->amp_ctrls);
	61	mutex_unlock(&mgr->amp_ctrls_lock);
	62
52c0d6e5 AE	63	BT_DBG("mgr %p ctrl %p", mgr, ctrl);
	64
	65	return ctrl;
	66	}
	67
	68	void amp_ctrl_list_flush(struct amp_mgr *mgr)
	69	{
	70	struct amp_ctrl ctrl, n;
	71
	72	BT_DBG("mgr %p", mgr);
	73
	74	mutex_lock(&mgr->amp_ctrls_lock);
	75	list_for_each_entry_safe(ctrl, n, &mgr->amp_ctrls, list) {
	76	list_del(&ctrl->list);
	77	amp_ctrl_put(ctrl);
	78	}
	79	mutex_unlock(&mgr->amp_ctrls_lock);
	80	}
	81
	82	struct amp_ctrl amp_ctrl_lookup(struct amp_mgr mgr, u8 id)
	83	{
	84	struct amp_ctrl *ctrl;
	85
	86	BT_DBG("mgr %p id %d", mgr, id);
	87
	88	mutex_lock(&mgr->amp_ctrls_lock);
	89	list_for_each_entry(ctrl, &mgr->amp_ctrls, list) {
	90	if (ctrl->id == id) {
	91	amp_ctrl_get(ctrl);
	92	mutex_unlock(&mgr->amp_ctrls_lock);
	93	return ctrl;
	94	}
	95	}
	96	mutex_unlock(&mgr->amp_ctrls_lock);
	97
	98	return NULL;
	99	}
	100
3161ae1c AE	101	/* Physical Link interface */
	102	static u8 __next_handle(struct amp_mgr *mgr)
	103	{
	104	if (++mgr->handle == 0)
	105	mgr->handle = 1;
	106
	107	return mgr->handle;
	108	}
	109
	110	struct hci_conn phylink_add(struct hci_dev hdev, struct amp_mgr *mgr,
	111	u8 remote_id)
	112	{
	113	bdaddr_t *dst = mgr->l2cap_conn->dst;
	114	struct hci_conn *hcon;
	115
	116	hcon = hci_conn_add(hdev, AMP_LINK, dst);
	117	if (!hcon)
	118	return NULL;
	119
	120	hcon->state = BT_CONNECT;
	121	hcon->out = true;
	122	hcon->attempt++;
	123	hcon->handle = __next_handle(mgr);
	124	hcon->remote_id = remote_id;
	125	hcon->amp_mgr = mgr;
	126
	127	return hcon;
	128	}
	129
ba221bba DK	130	/* AMP crypto key generation interface */
	131	static int hmac_sha256(u8 key, u8 ksize, char plaintext, u8 psize, u8 *output)
	132	{
	133	int ret = 0;
	134	struct crypto_shash *tfm;
	135
	136	if (!ksize)
	137	return -EINVAL;
	138
	139	tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
	140	if (IS_ERR(tfm)) {
	141	BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
	142	return PTR_ERR(tfm);
	143	}
	144
	145	ret = crypto_shash_setkey(tfm, key, ksize);
	146	if (ret) {
	147	BT_DBG("crypto_ahash_setkey failed: err %d", ret);
	148	} else {
	149	struct {
	150	struct shash_desc shash;
	151	char ctx[crypto_shash_descsize(tfm)];
	152	} desc;
	153
	154	desc.shash.tfm = tfm;
	155	desc.shash.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
	156
	157	ret = crypto_shash_digest(&desc.shash, plaintext, psize,
	158	output);
	159	}
	160
	161	crypto_free_shash(tfm);
	162	return ret;
	163	}
	164
5a349186 AE	165	int phylink_gen_key(struct hci_conn conn, u8 data, u8 len, u8 type)
	166	{
	167	struct hci_dev *hdev = conn->hdev;
	168	struct link_key *key;
	169	u8 keybuf[HCI_AMP_LINK_KEY_SIZE];
	170	u8 gamp_key[HCI_AMP_LINK_KEY_SIZE];
	171	int err;
	172
	173	if (!hci_conn_check_link_mode(conn))
	174	return -EACCES;
	175
	176	BT_DBG("conn %p key_type %d", conn, conn->key_type);
	177
	178	/* Legacy key */
	179	if (conn->key_type < 3) {
	180	BT_ERR("Legacy key type %d", conn->key_type);
	181	return -EACCES;
	182	}
	183
	184	*type = conn->key_type;
	185	*len = HCI_AMP_LINK_KEY_SIZE;
	186
	187	key = hci_find_link_key(hdev, &conn->dst);
079db0c6 AE	188	if (!key) {
	189	BT_DBG("No Link key for conn %p dst %pMR", conn, &conn->dst);
	190	return -EACCES;
	191	}
5a349186 AE	192
	193	/* BR/EDR Link Key concatenated together with itself */
	194	memcpy(&keybuf[0], key->val, HCI_LINK_KEY_SIZE);
	195	memcpy(&keybuf[HCI_LINK_KEY_SIZE], key->val, HCI_LINK_KEY_SIZE);
	196
	197	/* Derive Generic AMP Link Key (gamp) */
	198	err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
	199	if (err) {
	200	BT_ERR("Could not derive Generic AMP Key: err %d", err);
	201	return err;
	202	}
	203
	204	if (conn->key_type == HCI_LK_DEBUG_COMBINATION) {
	205	BT_DBG("Use Generic AMP Key (gamp)");
	206	memcpy(data, gamp_key, HCI_AMP_LINK_KEY_SIZE);
	207	return err;
	208	}
	209
	210	/* Derive Dedicated AMP Link Key: "802b" is 802.11 PAL keyID */
	211	return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
	212	}
	213
903e4541 AE	214	void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
	215	{
	216	struct hci_cp_read_local_amp_assoc cp;
	217	struct amp_assoc *loc_assoc = &hdev->loc_assoc;
	218
	219	BT_DBG("%s handle %d", hdev->name, phy_handle);
	220
	221	cp.phy_handle = phy_handle;
	222	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	223	cp.len_so_far = cpu_to_le16(loc_assoc->offset);
	224
	225	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	226	}
	227
	228	void amp_read_loc_assoc(struct hci_dev hdev, struct amp_mgr mgr)
	229	{
	230	struct hci_cp_read_local_amp_assoc cp;
	231
	232	memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
	233	memset(&cp, 0, sizeof(cp));
	234
	235	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	236
	237	mgr->state = READ_LOC_AMP_ASSOC;
	238	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	239	}
a02226d6	240
9495b2ee AE	241	void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
	242	struct hci_conn *hcon)
	243	{
	244	struct hci_cp_read_local_amp_assoc cp;
	245	struct amp_mgr *mgr = hcon->amp_mgr;
	246
	247	cp.phy_handle = hcon->handle;
	248	cp.len_so_far = cpu_to_le16(0);
	249	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	250
	251	mgr->state = READ_LOC_AMP_ASSOC_FINAL;
	252
	253	/* Read Local AMP Assoc final link information data */
	254	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	255	}
93c284ee AE	256
	257	/* Write AMP Assoc data fragments, returns true with last fragment written*/
	258	static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
	259	struct hci_conn *hcon)
	260	{
	261	struct hci_cp_write_remote_amp_assoc *cp;
	262	struct amp_mgr *mgr = hcon->amp_mgr;
	263	struct amp_ctrl *ctrl;
	264	u16 frag_len, len;
	265
	266	ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
	267	if (!ctrl)
	268	return false;
	269
	270	if (!ctrl->assoc_rem_len) {
	271	BT_DBG("all fragments are written");
	272	ctrl->assoc_rem_len = ctrl->assoc_len;
	273	ctrl->assoc_len_so_far = 0;
	274
	275	amp_ctrl_put(ctrl);
	276	return true;
	277	}
	278
	279	frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
	280	len = frag_len + sizeof(*cp);
	281
	282	cp = kzalloc(len, GFP_KERNEL);
	283	if (!cp) {
	284	amp_ctrl_put(ctrl);
	285	return false;
	286	}
	287
	288	BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
	289	hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);
	290
	291	cp->phy_handle = hcon->handle;
	292	cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
	293	cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
	294	memcpy(cp->frag, ctrl->assoc, frag_len);
	295
	296	ctrl->assoc_len_so_far += frag_len;
	297	ctrl->assoc_rem_len -= frag_len;
	298
	299	amp_ctrl_put(ctrl);
	300
	301	hci_send_cmd(hdev, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
	302
	303	kfree(cp);
	304
	305	return false;
	306	}
	307
	308	void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
	309	{
	310	struct hci_conn *hcon;
	311
	312	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	313
	314	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	315	if (!hcon)
	316	return;
	317
	318	amp_write_rem_assoc_frag(hdev, hcon);
	319	}
320
321	void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
322	{
323	struct hci_conn *hcon;
324
325	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
326
327	hcon = hci_conn_hash_lookup_handle(hdev, handle);
328	if (!hcon)
329	return;
330
331	BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);
332
333	amp_write_rem_assoc_frag(hdev, hcon);
334	}
335
a02226d6 AE	336	void amp_create_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	337	struct hci_conn *hcon)
	338	{
	339	struct hci_cp_create_phy_link cp;
	340
	341	cp.phy_handle = hcon->handle;
	342
	343	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	344	hcon->handle);
	345
	346	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	347	&cp.key_type)) {
	348	BT_DBG("Cannot create link key");
	349	return;
	350	}
	351
	352	hci_send_cmd(hdev, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
	353	}
dffa3871 AE	354
	355	void amp_accept_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	356	struct hci_conn *hcon)
	357	{
	358	struct hci_cp_accept_phy_link cp;
	359
	360	cp.phy_handle = hcon->handle;
	361
	362	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	363	hcon->handle);
	364
	365	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	366	&cp.key_type)) {
	367	BT_DBG("Cannot create link key");
	368	return;
	369	}
	370
	371	hci_send_cmd(hdev, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
	372	}