[mirror_ubuntu-artful-kernel.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 "hci_request.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,
	       kref_read(&ctrl->kref));

	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,
	       kref_read(&ctrl->kref));

	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);
}

static void read_local_amp_assoc_complete(struct hci_dev *hdev, u8 status,
					  u16 opcode, struct sk_buff *skb)
{
	struct hci_rp_read_local_amp_assoc *rp = (void *)skb->data;
	struct amp_assoc *assoc = &hdev->loc_assoc;
	size_t rem_len, frag_len;

	BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);

	if (rp->status)
		goto send_rsp;

	frag_len = skb->len - sizeof(*rp);
	rem_len = __le16_to_cpu(rp->rem_len);

	if (rem_len > frag_len) {
		BT_DBG("frag_len %zu rem_len %zu", frag_len, rem_len);

		memcpy(assoc->data + assoc->offset, rp->frag, frag_len);
		assoc->offset += frag_len;

		/* Read other fragments */
		amp_read_loc_assoc_frag(hdev, rp->phy_handle);

		return;
	}

	memcpy(assoc->data + assoc->offset, rp->frag, rem_len);
	assoc->len = assoc->offset + rem_len;
	assoc->offset = 0;

send_rsp:
	/* Send A2MP Rsp when all fragments are received */
	a2mp_send_getampassoc_rsp(hdev, rp->status);
	a2mp_send_create_phy_link_req(hdev, rp->status);
}

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;
	struct hci_request req;
	int err;

	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_req_init(&req, hdev);
	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
	if (err < 0)
		a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
}

void amp_read_loc_assoc(struct hci_dev *hdev, struct amp_mgr *mgr)
{
	struct hci_cp_read_local_amp_assoc cp;
	struct hci_request req;
	int err;

	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_req_init(&req, hdev);
	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
	if (err < 0)
		a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
}

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;
	struct hci_request req;
	int err;

	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_req_init(&req, hdev);
	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
	if (err < 0)
		a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
}

static void write_remote_amp_assoc_complete(struct hci_dev *hdev, u8 status,
					    u16 opcode, struct sk_buff *skb)
{
	struct hci_rp_write_remote_amp_assoc *rp = (void *)skb->data;

	BT_DBG("%s status 0x%2.2x phy_handle 0x%2.2x",
	       hdev->name, rp->status, rp->phy_handle);

	if (rp->status)
		return;

	amp_write_rem_assoc_continue(hdev, rp->phy_handle);
}

/* 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;
	struct hci_request req;
	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_req_init(&req, hdev);
	hci_req_add(&req, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
	hci_req_run_skb(&req, write_remote_amp_assoc_complete);

	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);
}

static void create_phylink_complete(struct hci_dev *hdev, u8 status,
				    u16 opcode)
{
	struct hci_cp_create_phy_link *cp;

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

	cp = hci_sent_cmd_data(hdev, HCI_OP_CREATE_PHY_LINK);
	if (!cp)
		return;

	hci_dev_lock(hdev);

	if (status) {
		struct hci_conn *hcon;

		hcon = hci_conn_hash_lookup_handle(hdev, cp->phy_handle);
		if (hcon)
			hci_conn_del(hcon);
	} else {
		amp_write_remote_assoc(hdev, cp->phy_handle);
	}

	hci_dev_unlock(hdev);
}

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

	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_req_init(&req, hdev);
	hci_req_add(&req, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
	hci_req_run(&req, create_phylink_complete);
}

static void accept_phylink_complete(struct hci_dev *hdev, u8 status,
				    u16 opcode)
{
	struct hci_cp_accept_phy_link *cp;

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

	if (status)
		return;

	cp = hci_sent_cmd_data(hdev, HCI_OP_ACCEPT_PHY_LINK);
	if (!cp)
		return;

	amp_write_remote_assoc(hdev, cp->phy_handle);
}

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

	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_req_init(&req, hdev);
	hci_req_add(&req, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
	hci_req_run(&req, accept_phylink_complete);
}

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
b3d39140	19	#include "hci_request.h"
7024728e	20	#include "a2mp.h"
7ef9fbf0 MH	21	#include "amp.h"
7ef9fbf0 MH	22
52c0d6e5	23	/* Remote AMP Controllers interface */
0b26ab9d	24	void amp_ctrl_get(struct amp_ctrl *ctrl)
52c0d6e5 AE	25	{
52c0d6e5 AE	26	BT_DBG("ctrl %p orig refcnt %d", ctrl,
2c935bc5	27	kref_read(&ctrl->kref));
52c0d6e5 AE	28
	29	kref_get(&ctrl->kref);
	30	}
	31
	32	static void amp_ctrl_destroy(struct kref *kref)
	33	{
	34	struct amp_ctrl *ctrl = container_of(kref, struct amp_ctrl, kref);
	35
	36	BT_DBG("ctrl %p", ctrl);
	37
	38	kfree(ctrl->assoc);
	39	kfree(ctrl);
	40	}
	41
	42	int amp_ctrl_put(struct amp_ctrl *ctrl)
	43	{
	44	BT_DBG("ctrl %p orig refcnt %d", ctrl,
2c935bc5	45	kref_read(&ctrl->kref));
52c0d6e5 AE	46
	47	return kref_put(&ctrl->kref, &amp_ctrl_destroy);
	48	}
	49
fa4ebc66	50	struct amp_ctrl amp_ctrl_add(struct amp_mgr mgr, u8 id)
52c0d6e5 AE	51	{
	52	struct amp_ctrl *ctrl;
	53
	54	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
	55	if (!ctrl)
	56	return NULL;
	57
fa4ebc66 AE	58	kref_init(&ctrl->kref);
	59	ctrl->id = id;
	60
52c0d6e5 AE	61	mutex_lock(&mgr->amp_ctrls_lock);
	62	list_add(&ctrl->list, &mgr->amp_ctrls);
	63	mutex_unlock(&mgr->amp_ctrls_lock);
	64
52c0d6e5 AE	65	BT_DBG("mgr %p ctrl %p", mgr, ctrl);
	66
	67	return ctrl;
	68	}
	69
	70	void amp_ctrl_list_flush(struct amp_mgr *mgr)
	71	{
	72	struct amp_ctrl ctrl, n;
	73
	74	BT_DBG("mgr %p", mgr);
	75
	76	mutex_lock(&mgr->amp_ctrls_lock);
	77	list_for_each_entry_safe(ctrl, n, &mgr->amp_ctrls, list) {
	78	list_del(&ctrl->list);
	79	amp_ctrl_put(ctrl);
	80	}
	81	mutex_unlock(&mgr->amp_ctrls_lock);
	82	}
	83
	84	struct amp_ctrl amp_ctrl_lookup(struct amp_mgr mgr, u8 id)
	85	{
	86	struct amp_ctrl *ctrl;
	87
	88	BT_DBG("mgr %p id %d", mgr, id);
	89
	90	mutex_lock(&mgr->amp_ctrls_lock);
	91	list_for_each_entry(ctrl, &mgr->amp_ctrls, list) {
	92	if (ctrl->id == id) {
	93	amp_ctrl_get(ctrl);
	94	mutex_unlock(&mgr->amp_ctrls_lock);
	95	return ctrl;
	96	}
	97	}
	98	mutex_unlock(&mgr->amp_ctrls_lock);
	99
	100	return NULL;
	101	}
	102
3161ae1c AE	103	/* Physical Link interface */
	104	static u8 __next_handle(struct amp_mgr *mgr)
	105	{
	106	if (++mgr->handle == 0)
	107	mgr->handle = 1;
	108
	109	return mgr->handle;
	110	}
	111
	112	struct hci_conn phylink_add(struct hci_dev hdev, struct amp_mgr *mgr,
a0c234fe	113	u8 remote_id, bool out)
3161ae1c	114	{
bdc8ead2	115	bdaddr_t *dst = &mgr->l2cap_conn->hcon->dst;
3161ae1c	116	struct hci_conn *hcon;
a5c4e309	117	u8 role = out ? HCI_ROLE_MASTER : HCI_ROLE_SLAVE;
3161ae1c	118
a5c4e309	119	hcon = hci_conn_add(hdev, AMP_LINK, dst, role);
3161ae1c AE	120	if (!hcon)
	121	return NULL;
	122
a0c234fe AE	123	BT_DBG("hcon %p dst %pMR", hcon, dst);
a0c234fe AE	124
3161ae1c	125	hcon->state = BT_CONNECT;
3161ae1c AE	126	hcon->attempt++;
	127	hcon->handle = __next_handle(mgr);
	128	hcon->remote_id = remote_id;
f706adfe	129	hcon->amp_mgr = amp_mgr_get(mgr);
3161ae1c AE	130
	131	return hcon;
	132	}
	133
ba221bba DK	134	/* AMP crypto key generation interface */
	135	static int hmac_sha256(u8 key, u8 ksize, char plaintext, u8 psize, u8 *output)
	136	{
ba221bba	137	struct crypto_shash *tfm;
252670c4	138	struct shash_desc *shash;
0a961a44	139	int ret;
ba221bba DK	140
	141	if (!ksize)
	142	return -EINVAL;
	143
	144	tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
	145	if (IS_ERR(tfm)) {
	146	BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
	147	return PTR_ERR(tfm);
	148	}
	149
	150	ret = crypto_shash_setkey(tfm, key, ksize);
	151	if (ret) {
	152	BT_DBG("crypto_ahash_setkey failed: err %d", ret);
252670c4 JH	153	goto failed;
252670c4 JH	154	}
ba221bba	155
252670c4 JH	156	shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm),
	157	GFP_KERNEL);
	158	if (!shash) {
	159	ret = -ENOMEM;
	160	goto failed;
ba221bba DK	161	}
ba221bba DK	162
252670c4 JH	163	shash->tfm = tfm;
	164	shash->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
	165
	166	ret = crypto_shash_digest(shash, plaintext, psize, output);
	167
	168	kfree(shash);
	169
	170	failed:
ba221bba DK	171	crypto_free_shash(tfm);
	172	return ret;
	173	}
	174
5a349186 AE	175	int phylink_gen_key(struct hci_conn conn, u8 data, u8 len, u8 type)
	176	{
	177	struct hci_dev *hdev = conn->hdev;
	178	struct link_key *key;
	179	u8 keybuf[HCI_AMP_LINK_KEY_SIZE];
	180	u8 gamp_key[HCI_AMP_LINK_KEY_SIZE];
	181	int err;
	182
	183	if (!hci_conn_check_link_mode(conn))
	184	return -EACCES;
	185
	186	BT_DBG("conn %p key_type %d", conn, conn->key_type);
	187
	188	/* Legacy key */
	189	if (conn->key_type < 3) {
	190	BT_ERR("Legacy key type %d", conn->key_type);
	191	return -EACCES;
	192	}
	193
	194	*type = conn->key_type;
	195	*len = HCI_AMP_LINK_KEY_SIZE;
	196
	197	key = hci_find_link_key(hdev, &conn->dst);
079db0c6 AE	198	if (!key) {
	199	BT_DBG("No Link key for conn %p dst %pMR", conn, &conn->dst);
	200	return -EACCES;
	201	}
5a349186 AE	202
	203	/* BR/EDR Link Key concatenated together with itself */
	204	memcpy(&keybuf[0], key->val, HCI_LINK_KEY_SIZE);
	205	memcpy(&keybuf[HCI_LINK_KEY_SIZE], key->val, HCI_LINK_KEY_SIZE);
	206
	207	/* Derive Generic AMP Link Key (gamp) */
	208	err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
	209	if (err) {
	210	BT_ERR("Could not derive Generic AMP Key: err %d", err);
	211	return err;
	212	}
	213
	214	if (conn->key_type == HCI_LK_DEBUG_COMBINATION) {
	215	BT_DBG("Use Generic AMP Key (gamp)");
	216	memcpy(data, gamp_key, HCI_AMP_LINK_KEY_SIZE);
	217	return err;
	218	}
	219
	220	/* Derive Dedicated AMP Link Key: "802b" is 802.11 PAL keyID */
	221	return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
	222	}
	223
b3d39140 AW	224	static void read_local_amp_assoc_complete(struct hci_dev *hdev, u8 status,
	225	u16 opcode, struct sk_buff *skb)
	226	{
	227	struct hci_rp_read_local_amp_assoc rp = (void )skb->data;
	228	struct amp_assoc *assoc = &hdev->loc_assoc;
	229	size_t rem_len, frag_len;
	230
	231	BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
	232
	233	if (rp->status)
	234	goto send_rsp;
	235
	236	frag_len = skb->len - sizeof(*rp);
	237	rem_len = __le16_to_cpu(rp->rem_len);
	238
	239	if (rem_len > frag_len) {
	240	BT_DBG("frag_len %zu rem_len %zu", frag_len, rem_len);
	241
	242	memcpy(assoc->data + assoc->offset, rp->frag, frag_len);
	243	assoc->offset += frag_len;
	244
	245	/* Read other fragments */
	246	amp_read_loc_assoc_frag(hdev, rp->phy_handle);
	247
	248	return;
	249	}
	250
	251	memcpy(assoc->data + assoc->offset, rp->frag, rem_len);
	252	assoc->len = assoc->offset + rem_len;
	253	assoc->offset = 0;
	254
	255	send_rsp:
	256	/* Send A2MP Rsp when all fragments are received */
	257	a2mp_send_getampassoc_rsp(hdev, rp->status);
	258	a2mp_send_create_phy_link_req(hdev, rp->status);
	259	}
	260
903e4541 AE	261	void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
	262	{
	263	struct hci_cp_read_local_amp_assoc cp;
	264	struct amp_assoc *loc_assoc = &hdev->loc_assoc;
b3d39140	265	struct hci_request req;
cd50361c	266	int err;
903e4541 AE	267
	268	BT_DBG("%s handle %d", hdev->name, phy_handle);
	269
	270	cp.phy_handle = phy_handle;
	271	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	272	cp.len_so_far = cpu_to_le16(loc_assoc->offset);
	273
b3d39140 AW	274	hci_req_init(&req, hdev);
	275	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	276	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
	277	if (err < 0)
	278	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
903e4541 AE	279	}
	280
	281	void amp_read_loc_assoc(struct hci_dev hdev, struct amp_mgr mgr)
	282	{
	283	struct hci_cp_read_local_amp_assoc cp;
b3d39140	284	struct hci_request req;
cd50361c	285	int err;
903e4541 AE	286
	287	memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
	288	memset(&cp, 0, sizeof(cp));
	289
	290	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	291
cb6801c6	292	set_bit(READ_LOC_AMP_ASSOC, &mgr->state);
b3d39140 AW	293	hci_req_init(&req, hdev);
b3d39140 AW	294	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
cd50361c	295	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
b3d39140 AW	296	if (err < 0)
b3d39140 AW	297	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
903e4541	298	}
a02226d6	299
9495b2ee AE	300	void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
	301	struct hci_conn *hcon)
	302	{
	303	struct hci_cp_read_local_amp_assoc cp;
	304	struct amp_mgr *mgr = hcon->amp_mgr;
b3d39140	305	struct hci_request req;
cd50361c	306	int err;
9495b2ee AE	307
	308	cp.phy_handle = hcon->handle;
	309	cp.len_so_far = cpu_to_le16(0);
	310	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	311
cb6801c6	312	set_bit(READ_LOC_AMP_ASSOC_FINAL, &mgr->state);
9495b2ee AE	313
9495b2ee AE	314	/* Read Local AMP Assoc final link information data */
b3d39140 AW	315	hci_req_init(&req, hdev);
b3d39140 AW	316	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
cd50361c	317	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
b3d39140 AW	318	if (err < 0)
	319	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
	320	}
	321
	322	static void write_remote_amp_assoc_complete(struct hci_dev *hdev, u8 status,
	323	u16 opcode, struct sk_buff *skb)
	324	{
	325	struct hci_rp_write_remote_amp_assoc rp = (void )skb->data;
	326
	327	BT_DBG("%s status 0x%2.2x phy_handle 0x%2.2x",
	328	hdev->name, rp->status, rp->phy_handle);
	329
	330	if (rp->status)
	331	return;
	332
	333	amp_write_rem_assoc_continue(hdev, rp->phy_handle);
9495b2ee	334	}
93c284ee AE	335
	336	/* Write AMP Assoc data fragments, returns true with last fragment written*/
	337	static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
	338	struct hci_conn *hcon)
	339	{
	340	struct hci_cp_write_remote_amp_assoc *cp;
	341	struct amp_mgr *mgr = hcon->amp_mgr;
	342	struct amp_ctrl *ctrl;
b3d39140	343	struct hci_request req;
93c284ee AE	344	u16 frag_len, len;
	345
	346	ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
	347	if (!ctrl)
	348	return false;
	349
	350	if (!ctrl->assoc_rem_len) {
	351	BT_DBG("all fragments are written");
	352	ctrl->assoc_rem_len = ctrl->assoc_len;
	353	ctrl->assoc_len_so_far = 0;
	354
	355	amp_ctrl_put(ctrl);
	356	return true;
	357	}
	358
	359	frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
	360	len = frag_len + sizeof(*cp);
	361
	362	cp = kzalloc(len, GFP_KERNEL);
	363	if (!cp) {
	364	amp_ctrl_put(ctrl);
	365	return false;
	366	}
	367
	368	BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
	369	hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);
	370
	371	cp->phy_handle = hcon->handle;
	372	cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
	373	cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
	374	memcpy(cp->frag, ctrl->assoc, frag_len);
	375
	376	ctrl->assoc_len_so_far += frag_len;
	377	ctrl->assoc_rem_len -= frag_len;
	378
	379	amp_ctrl_put(ctrl);
	380
b3d39140	381	hci_req_init(&req, hdev);
0208bc88	382	hci_req_add(&req, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
b3d39140	383	hci_req_run_skb(&req, write_remote_amp_assoc_complete);
93c284ee AE	384
	385	kfree(cp);
	386
	387	return false;
	388	}
	389
	390	void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
	391	{
	392	struct hci_conn *hcon;
	393
	394	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	395
	396	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	397	if (!hcon)
	398	return;
	399
8e05e3ba AE	400	/* Send A2MP create phylink rsp when all fragments are written */
	401	if (amp_write_rem_assoc_frag(hdev, hcon))
	402	a2mp_send_create_phy_link_rsp(hdev, 0);
93c284ee AE	403	}
	404
	405	void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
	406	{
	407	struct hci_conn *hcon;
	408
	409	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	410
	411	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	412	if (!hcon)
	413	return;
	414
	415	BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);
	416
	417	amp_write_rem_assoc_frag(hdev, hcon);
	418	}
	419
df9b89c7 AW	420	static void create_phylink_complete(struct hci_dev *hdev, u8 status,
	421	u16 opcode)
	422	{
	423	struct hci_cp_create_phy_link *cp;
	424
	425	BT_DBG("%s status 0x%2.2x", hdev->name, status);
	426
	427	cp = hci_sent_cmd_data(hdev, HCI_OP_CREATE_PHY_LINK);
	428	if (!cp)
	429	return;
	430
	431	hci_dev_lock(hdev);
	432
	433	if (status) {
	434	struct hci_conn *hcon;
	435
	436	hcon = hci_conn_hash_lookup_handle(hdev, cp->phy_handle);
	437	if (hcon)
	438	hci_conn_del(hcon);
	439	} else {
	440	amp_write_remote_assoc(hdev, cp->phy_handle);
	441	}
	442
	443	hci_dev_unlock(hdev);
	444	}
	445
a02226d6 AE	446	void amp_create_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	447	struct hci_conn *hcon)
	448	{
	449	struct hci_cp_create_phy_link cp;
df9b89c7	450	struct hci_request req;
a02226d6 AE	451
	452	cp.phy_handle = hcon->handle;
	453
	454	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	455	hcon->handle);
	456
	457	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	458	&cp.key_type)) {
	459	BT_DBG("Cannot create link key");
	460	return;
	461	}
	462
df9b89c7 AW	463	hci_req_init(&req, hdev);
	464	hci_req_add(&req, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
	465	hci_req_run(&req, create_phylink_complete);
	466	}
	467
	468	static void accept_phylink_complete(struct hci_dev *hdev, u8 status,
	469	u16 opcode)
	470	{
	471	struct hci_cp_accept_phy_link *cp;
	472
	473	BT_DBG("%s status 0x%2.2x", hdev->name, status);
	474
	475	if (status)
	476	return;
	477
	478	cp = hci_sent_cmd_data(hdev, HCI_OP_ACCEPT_PHY_LINK);
	479	if (!cp)
	480	return;
	481
	482	amp_write_remote_assoc(hdev, cp->phy_handle);
a02226d6	483	}
dffa3871 AE	484
	485	void amp_accept_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	486	struct hci_conn *hcon)
	487	{
	488	struct hci_cp_accept_phy_link cp;
df9b89c7	489	struct hci_request req;
dffa3871 AE	490
	491	cp.phy_handle = hcon->handle;
	492
	493	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	494	hcon->handle);
	495
	496	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	497	&cp.key_type)) {
	498	BT_DBG("Cannot create link key");
	499	return;
	500	}
	501
df9b89c7 AW	502	hci_req_init(&req, hdev);
	503	hci_req_add(&req, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
	504	hci_req_run(&req, accept_phylink_complete);
dffa3871	505	}
5ce66b59	506
cf70ff22 AE	507	void amp_physical_cfm(struct hci_conn bredr_hcon, struct hci_conn hs_hcon)
	508	{
	509	struct hci_dev *bredr_hdev = hci_dev_hold(bredr_hcon->hdev);
	510	struct amp_mgr *mgr = hs_hcon->amp_mgr;
	511	struct l2cap_chan *bredr_chan;
	512
	513	BT_DBG("bredr_hcon %p hs_hcon %p mgr %p", bredr_hcon, hs_hcon, mgr);
	514
	515	if (!bredr_hdev \|\| !mgr \|\| !mgr->bredr_chan)
	516	return;
	517
	518	bredr_chan = mgr->bredr_chan;
	519
a514b17f AE	520	l2cap_chan_lock(bredr_chan);
a514b17f AE	521
cf70ff22	522	set_bit(FLAG_EFS_ENABLE, &bredr_chan->flags);
fffadc08	523	bredr_chan->remote_amp_id = hs_hcon->remote_id;
37295996	524	bredr_chan->local_amp_id = hs_hcon->hdev->id;
cf70ff22 AE	525	bredr_chan->hs_hcon = hs_hcon;
cf70ff22 AE	526	bredr_chan->conn->mtu = hs_hcon->hdev->block_mtu;
cf70ff22	527
a514b17f AE	528	__l2cap_physical_cfm(bredr_chan, 0);
	529
	530	l2cap_chan_unlock(bredr_chan);
cf70ff22 AE	531
	532	hci_dev_put(bredr_hdev);
	533	}
	534
5ce66b59 AE	535	void amp_create_logical_link(struct l2cap_chan *chan)
5ce66b59 AE	536	{
7a9898c6	537	struct hci_conn *hs_hcon = chan->hs_hcon;
5ce66b59	538	struct hci_cp_create_accept_logical_link cp;
5ce66b59 AE	539	struct hci_dev *hdev;
5ce66b59 AE	540
bdc8ead2 MH	541	BT_DBG("chan %p hs_hcon %p dst %pMR", chan, hs_hcon,
bdc8ead2 MH	542	&chan->conn->hcon->dst);
5ce66b59	543
7a9898c6	544	if (!hs_hcon)
5ce66b59 AE	545	return;
	546
	547	hdev = hci_dev_hold(chan->hs_hcon->hdev);
	548	if (!hdev)
	549	return;
	550
7a9898c6	551	cp.phy_handle = hs_hcon->handle;
5ce66b59 AE	552
	553	cp.tx_flow_spec.id = chan->local_id;
	554	cp.tx_flow_spec.stype = chan->local_stype;
	555	cp.tx_flow_spec.msdu = cpu_to_le16(chan->local_msdu);
	556	cp.tx_flow_spec.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
	557	cp.tx_flow_spec.acc_lat = cpu_to_le32(chan->local_acc_lat);
	558	cp.tx_flow_spec.flush_to = cpu_to_le32(chan->local_flush_to);
	559
	560	cp.rx_flow_spec.id = chan->remote_id;
	561	cp.rx_flow_spec.stype = chan->remote_stype;
	562	cp.rx_flow_spec.msdu = cpu_to_le16(chan->remote_msdu);
	563	cp.rx_flow_spec.sdu_itime = cpu_to_le32(chan->remote_sdu_itime);
	564	cp.rx_flow_spec.acc_lat = cpu_to_le32(chan->remote_acc_lat);
	565	cp.rx_flow_spec.flush_to = cpu_to_le32(chan->remote_flush_to);
	566
7a9898c6	567	if (hs_hcon->out)
5ce66b59 AE	568	hci_send_cmd(hdev, HCI_OP_CREATE_LOGICAL_LINK, sizeof(cp),
	569	&cp);
	570	else
	571	hci_send_cmd(hdev, HCI_OP_ACCEPT_LOGICAL_LINK, sizeof(cp),
	572	&cp);
	573
5ce66b59 AE	574	hci_dev_put(hdev);
5ce66b59 AE	575	}
606e2a10	576
419e08c1 AE	577	void amp_disconnect_logical_link(struct hci_chan *hchan)
	578	{
	579	struct hci_conn *hcon = hchan->conn;
	580	struct hci_cp_disconn_logical_link cp;
	581
	582	if (hcon->state != BT_CONNECTED) {
	583	BT_DBG("hchan %p not connected", hchan);
	584	return;
	585	}
	586
	587	cp.log_handle = cpu_to_le16(hchan->handle);
	588	hci_send_cmd(hcon->hdev, HCI_OP_DISCONN_LOGICAL_LINK, sizeof(cp), &cp);
	589	}
	590
606e2a10 AE	591	void amp_destroy_logical_link(struct hci_chan *hchan, u8 reason)
	592	{
	593	BT_DBG("hchan %p", hchan);
	594
	595	hci_chan_del(hchan);
	596	}