[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)
{
	struct amp_ctrl *ctrl;

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

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

	kref_init(&ctrl->kref);

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