[linux-block.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;

	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_dev_err(hdev, "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_dev_err(hdev, "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	163	shash->tfm = tfm;
252670c4 JH	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) {
2064ee33	189	bt_dev_err(hdev, "legacy key type %d", conn->key_type);
5a349186 AE	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) {
2064ee33	209	bt_dev_err(hdev, "could not derive Generic AMP Key: err %d", err);
5a349186 AE	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
b3d39140 AW	223	static void read_local_amp_assoc_complete(struct hci_dev *hdev, u8 status,
	224	u16 opcode, struct sk_buff *skb)
	225	{
	226	struct hci_rp_read_local_amp_assoc rp = (void )skb->data;
	227	struct amp_assoc *assoc = &hdev->loc_assoc;
	228	size_t rem_len, frag_len;
	229
	230	BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
	231
	232	if (rp->status)
	233	goto send_rsp;
	234
	235	frag_len = skb->len - sizeof(*rp);
	236	rem_len = __le16_to_cpu(rp->rem_len);
	237
	238	if (rem_len > frag_len) {
	239	BT_DBG("frag_len %zu rem_len %zu", frag_len, rem_len);
	240
	241	memcpy(assoc->data + assoc->offset, rp->frag, frag_len);
	242	assoc->offset += frag_len;
	243
	244	/* Read other fragments */
	245	amp_read_loc_assoc_frag(hdev, rp->phy_handle);
	246
	247	return;
	248	}
	249
	250	memcpy(assoc->data + assoc->offset, rp->frag, rem_len);
	251	assoc->len = assoc->offset + rem_len;
	252	assoc->offset = 0;
	253
	254	send_rsp:
	255	/* Send A2MP Rsp when all fragments are received */
	256	a2mp_send_getampassoc_rsp(hdev, rp->status);
	257	a2mp_send_create_phy_link_req(hdev, rp->status);
	258	}
	259
903e4541 AE	260	void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
	261	{
	262	struct hci_cp_read_local_amp_assoc cp;
	263	struct amp_assoc *loc_assoc = &hdev->loc_assoc;
b3d39140	264	struct hci_request req;
cd50361c	265	int err;
903e4541 AE	266
	267	BT_DBG("%s handle %d", hdev->name, phy_handle);
	268
	269	cp.phy_handle = phy_handle;
	270	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	271	cp.len_so_far = cpu_to_le16(loc_assoc->offset);
	272
b3d39140 AW	273	hci_req_init(&req, hdev);
	274	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	275	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
	276	if (err < 0)
	277	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
903e4541 AE	278	}
	279
	280	void amp_read_loc_assoc(struct hci_dev hdev, struct amp_mgr mgr)
	281	{
	282	struct hci_cp_read_local_amp_assoc cp;
b3d39140	283	struct hci_request req;
cd50361c	284	int err;
903e4541 AE	285
	286	memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
	287	memset(&cp, 0, sizeof(cp));
	288
	289	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	290
cb6801c6	291	set_bit(READ_LOC_AMP_ASSOC, &mgr->state);
b3d39140 AW	292	hci_req_init(&req, hdev);
b3d39140 AW	293	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
cd50361c	294	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
b3d39140 AW	295	if (err < 0)
b3d39140 AW	296	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
903e4541	297	}
a02226d6	298
9495b2ee AE	299	void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
	300	struct hci_conn *hcon)
	301	{
	302	struct hci_cp_read_local_amp_assoc cp;
	303	struct amp_mgr *mgr = hcon->amp_mgr;
b3d39140	304	struct hci_request req;
cd50361c	305	int err;
9495b2ee AE	306
	307	cp.phy_handle = hcon->handle;
	308	cp.len_so_far = cpu_to_le16(0);
	309	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	310
cb6801c6	311	set_bit(READ_LOC_AMP_ASSOC_FINAL, &mgr->state);
9495b2ee AE	312
9495b2ee AE	313	/* Read Local AMP Assoc final link information data */
b3d39140 AW	314	hci_req_init(&req, hdev);
b3d39140 AW	315	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
cd50361c	316	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
b3d39140 AW	317	if (err < 0)
	318	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
	319	}
	320
	321	static void write_remote_amp_assoc_complete(struct hci_dev *hdev, u8 status,
	322	u16 opcode, struct sk_buff *skb)
	323	{
	324	struct hci_rp_write_remote_amp_assoc rp = (void )skb->data;
	325
	326	BT_DBG("%s status 0x%2.2x phy_handle 0x%2.2x",
	327	hdev->name, rp->status, rp->phy_handle);
	328
	329	if (rp->status)
	330	return;
	331
	332	amp_write_rem_assoc_continue(hdev, rp->phy_handle);
9495b2ee	333	}
93c284ee AE	334
	335	/* Write AMP Assoc data fragments, returns true with last fragment written*/
	336	static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
	337	struct hci_conn *hcon)
	338	{
	339	struct hci_cp_write_remote_amp_assoc *cp;
	340	struct amp_mgr *mgr = hcon->amp_mgr;
	341	struct amp_ctrl *ctrl;
b3d39140	342	struct hci_request req;
93c284ee AE	343	u16 frag_len, len;
	344
	345	ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
	346	if (!ctrl)
	347	return false;
	348
	349	if (!ctrl->assoc_rem_len) {
	350	BT_DBG("all fragments are written");
	351	ctrl->assoc_rem_len = ctrl->assoc_len;
	352	ctrl->assoc_len_so_far = 0;
	353
	354	amp_ctrl_put(ctrl);
	355	return true;
	356	}
	357
	358	frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
	359	len = frag_len + sizeof(*cp);
	360
	361	cp = kzalloc(len, GFP_KERNEL);
	362	if (!cp) {
	363	amp_ctrl_put(ctrl);
	364	return false;
	365	}
	366
	367	BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
	368	hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);
	369
	370	cp->phy_handle = hcon->handle;
	371	cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
	372	cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
	373	memcpy(cp->frag, ctrl->assoc, frag_len);
	374
	375	ctrl->assoc_len_so_far += frag_len;
	376	ctrl->assoc_rem_len -= frag_len;
	377
	378	amp_ctrl_put(ctrl);
	379
b3d39140	380	hci_req_init(&req, hdev);
0208bc88	381	hci_req_add(&req, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
b3d39140	382	hci_req_run_skb(&req, write_remote_amp_assoc_complete);
93c284ee AE	383
	384	kfree(cp);
	385
	386	return false;
	387	}
	388
	389	void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
	390	{
	391	struct hci_conn *hcon;
	392
	393	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	394
	395	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	396	if (!hcon)
	397	return;
	398
8e05e3ba AE	399	/* Send A2MP create phylink rsp when all fragments are written */
	400	if (amp_write_rem_assoc_frag(hdev, hcon))
	401	a2mp_send_create_phy_link_rsp(hdev, 0);
93c284ee AE	402	}
	403
	404	void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
	405	{
	406	struct hci_conn *hcon;
	407
	408	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	409
	410	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	411	if (!hcon)
	412	return;
	413
	414	BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);
	415
	416	amp_write_rem_assoc_frag(hdev, hcon);
	417	}
	418
df9b89c7 AW	419	static void create_phylink_complete(struct hci_dev *hdev, u8 status,
	420	u16 opcode)
	421	{
	422	struct hci_cp_create_phy_link *cp;
	423
	424	BT_DBG("%s status 0x%2.2x", hdev->name, status);
	425
	426	cp = hci_sent_cmd_data(hdev, HCI_OP_CREATE_PHY_LINK);
	427	if (!cp)
	428	return;
	429
	430	hci_dev_lock(hdev);
	431
	432	if (status) {
	433	struct hci_conn *hcon;
	434
	435	hcon = hci_conn_hash_lookup_handle(hdev, cp->phy_handle);
	436	if (hcon)
	437	hci_conn_del(hcon);
	438	} else {
	439	amp_write_remote_assoc(hdev, cp->phy_handle);
	440	}
	441
	442	hci_dev_unlock(hdev);
	443	}
	444
a02226d6 AE	445	void amp_create_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	446	struct hci_conn *hcon)
	447	{
	448	struct hci_cp_create_phy_link cp;
df9b89c7	449	struct hci_request req;
a02226d6 AE	450
	451	cp.phy_handle = hcon->handle;
	452
	453	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	454	hcon->handle);
	455
	456	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	457	&cp.key_type)) {
	458	BT_DBG("Cannot create link key");
	459	return;
	460	}
	461
df9b89c7 AW	462	hci_req_init(&req, hdev);
	463	hci_req_add(&req, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
	464	hci_req_run(&req, create_phylink_complete);
	465	}
	466
	467	static void accept_phylink_complete(struct hci_dev *hdev, u8 status,
	468	u16 opcode)
	469	{
	470	struct hci_cp_accept_phy_link *cp;
	471
	472	BT_DBG("%s status 0x%2.2x", hdev->name, status);
	473
	474	if (status)
	475	return;
	476
	477	cp = hci_sent_cmd_data(hdev, HCI_OP_ACCEPT_PHY_LINK);
	478	if (!cp)
	479	return;
	480
	481	amp_write_remote_assoc(hdev, cp->phy_handle);
a02226d6	482	}
dffa3871 AE	483
	484	void amp_accept_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	485	struct hci_conn *hcon)
	486	{
	487	struct hci_cp_accept_phy_link cp;
df9b89c7	488	struct hci_request req;
dffa3871 AE	489
	490	cp.phy_handle = hcon->handle;
	491
	492	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	493	hcon->handle);
	494
	495	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	496	&cp.key_type)) {
	497	BT_DBG("Cannot create link key");
	498	return;
	499	}
	500
df9b89c7 AW	501	hci_req_init(&req, hdev);
	502	hci_req_add(&req, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
	503	hci_req_run(&req, accept_phylink_complete);
dffa3871	504	}
5ce66b59	505
cf70ff22 AE	506	void amp_physical_cfm(struct hci_conn bredr_hcon, struct hci_conn hs_hcon)
	507	{
	508	struct hci_dev *bredr_hdev = hci_dev_hold(bredr_hcon->hdev);
	509	struct amp_mgr *mgr = hs_hcon->amp_mgr;
	510	struct l2cap_chan *bredr_chan;
	511
	512	BT_DBG("bredr_hcon %p hs_hcon %p mgr %p", bredr_hcon, hs_hcon, mgr);
	513
	514	if (!bredr_hdev \|\| !mgr \|\| !mgr->bredr_chan)
	515	return;
	516
	517	bredr_chan = mgr->bredr_chan;
	518
a514b17f AE	519	l2cap_chan_lock(bredr_chan);
a514b17f AE	520
cf70ff22	521	set_bit(FLAG_EFS_ENABLE, &bredr_chan->flags);
fffadc08	522	bredr_chan->remote_amp_id = hs_hcon->remote_id;
37295996	523	bredr_chan->local_amp_id = hs_hcon->hdev->id;
cf70ff22 AE	524	bredr_chan->hs_hcon = hs_hcon;
cf70ff22 AE	525	bredr_chan->conn->mtu = hs_hcon->hdev->block_mtu;
cf70ff22	526
a514b17f AE	527	__l2cap_physical_cfm(bredr_chan, 0);
	528
	529	l2cap_chan_unlock(bredr_chan);
cf70ff22 AE	530
	531	hci_dev_put(bredr_hdev);
	532	}
	533
5ce66b59 AE	534	void amp_create_logical_link(struct l2cap_chan *chan)
5ce66b59 AE	535	{
7a9898c6	536	struct hci_conn *hs_hcon = chan->hs_hcon;
5ce66b59	537	struct hci_cp_create_accept_logical_link cp;
5ce66b59 AE	538	struct hci_dev *hdev;
5ce66b59 AE	539
bdc8ead2 MH	540	BT_DBG("chan %p hs_hcon %p dst %pMR", chan, hs_hcon,
bdc8ead2 MH	541	&chan->conn->hcon->dst);
5ce66b59	542
7a9898c6	543	if (!hs_hcon)
5ce66b59 AE	544	return;
	545
	546	hdev = hci_dev_hold(chan->hs_hcon->hdev);
	547	if (!hdev)
	548	return;
	549
7a9898c6	550	cp.phy_handle = hs_hcon->handle;
5ce66b59 AE	551
	552	cp.tx_flow_spec.id = chan->local_id;
	553	cp.tx_flow_spec.stype = chan->local_stype;
	554	cp.tx_flow_spec.msdu = cpu_to_le16(chan->local_msdu);
	555	cp.tx_flow_spec.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
	556	cp.tx_flow_spec.acc_lat = cpu_to_le32(chan->local_acc_lat);
	557	cp.tx_flow_spec.flush_to = cpu_to_le32(chan->local_flush_to);
	558
	559	cp.rx_flow_spec.id = chan->remote_id;
	560	cp.rx_flow_spec.stype = chan->remote_stype;
	561	cp.rx_flow_spec.msdu = cpu_to_le16(chan->remote_msdu);
	562	cp.rx_flow_spec.sdu_itime = cpu_to_le32(chan->remote_sdu_itime);
	563	cp.rx_flow_spec.acc_lat = cpu_to_le32(chan->remote_acc_lat);
	564	cp.rx_flow_spec.flush_to = cpu_to_le32(chan->remote_flush_to);
	565
7a9898c6	566	if (hs_hcon->out)
5ce66b59 AE	567	hci_send_cmd(hdev, HCI_OP_CREATE_LOGICAL_LINK, sizeof(cp),
	568	&cp);
	569	else
	570	hci_send_cmd(hdev, HCI_OP_ACCEPT_LOGICAL_LINK, sizeof(cp),
	571	&cp);
	572
5ce66b59 AE	573	hci_dev_put(hdev);
5ce66b59 AE	574	}
606e2a10	575
419e08c1 AE	576	void amp_disconnect_logical_link(struct hci_chan *hchan)
	577	{
	578	struct hci_conn *hcon = hchan->conn;
	579	struct hci_cp_disconn_logical_link cp;
	580
	581	if (hcon->state != BT_CONNECTED) {
	582	BT_DBG("hchan %p not connected", hchan);
	583	return;
	584	}
	585
	586	cp.log_handle = cpu_to_le16(hchan->handle);
	587	hci_send_cmd(hcon->hdev, HCI_OP_DISCONN_LOGICAL_LINK, sizeof(cp), &cp);
	588	}
	589
606e2a10 AE	590	void amp_destroy_logical_link(struct hci_chan *hchan, u8 reason)
	591	{
	592	BT_DBG("hchan %p", hchan);
	593
	594	hci_chan_del(hchan);
	595	}