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

// SPDX-License-Identifier: GPL-2.0-only
/*
   Copyright (c) 2011,2012 Intel Corp.

*/

#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 %u", 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, __next_handle(mgr));
	if (!hcon)
		return NULL;

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

	hcon->state = BT_CONNECT;
	hcon->attempt++;
	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 %u", 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 %u", 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;

	if (!mgr)
		return;

	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
97fb5e8d	1	// SPDX-License-Identifier: GPL-2.0-only
903e4541 AE	2	/*
	3	Copyright (c) 2011,2012 Intel Corp.
	4
903e4541 AE	5	*/
	6
	7	#include <net/bluetooth/bluetooth.h>
	8	#include <net/bluetooth/hci.h>
	9	#include <net/bluetooth/hci_core.h>
ba221bba	10	#include <crypto/hash.h>
903e4541	11
b3d39140	12	#include "hci_request.h"
7024728e	13	#include "a2mp.h"
7ef9fbf0 MH	14	#include "amp.h"
7ef9fbf0 MH	15
52c0d6e5	16	/* Remote AMP Controllers interface */
0b26ab9d	17	void amp_ctrl_get(struct amp_ctrl *ctrl)
52c0d6e5 AE	18	{
52c0d6e5 AE	19	BT_DBG("ctrl %p orig refcnt %d", ctrl,
2c935bc5	20	kref_read(&ctrl->kref));
52c0d6e5 AE	21
	22	kref_get(&ctrl->kref);
	23	}
	24
	25	static void amp_ctrl_destroy(struct kref *kref)
	26	{
	27	struct amp_ctrl *ctrl = container_of(kref, struct amp_ctrl, kref);
	28
	29	BT_DBG("ctrl %p", ctrl);
	30
	31	kfree(ctrl->assoc);
	32	kfree(ctrl);
	33	}
	34
	35	int amp_ctrl_put(struct amp_ctrl *ctrl)
	36	{
	37	BT_DBG("ctrl %p orig refcnt %d", ctrl,
2c935bc5	38	kref_read(&ctrl->kref));
52c0d6e5 AE	39
	40	return kref_put(&ctrl->kref, &amp_ctrl_destroy);
	41	}
	42
fa4ebc66	43	struct amp_ctrl amp_ctrl_add(struct amp_mgr mgr, u8 id)
52c0d6e5 AE	44	{
	45	struct amp_ctrl *ctrl;
	46
	47	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
	48	if (!ctrl)
	49	return NULL;
	50
fa4ebc66 AE	51	kref_init(&ctrl->kref);
	52	ctrl->id = id;
	53
52c0d6e5 AE	54	mutex_lock(&mgr->amp_ctrls_lock);
	55	list_add(&ctrl->list, &mgr->amp_ctrls);
	56	mutex_unlock(&mgr->amp_ctrls_lock);
	57
52c0d6e5 AE	58	BT_DBG("mgr %p ctrl %p", mgr, ctrl);
	59
	60	return ctrl;
	61	}
	62
	63	void amp_ctrl_list_flush(struct amp_mgr *mgr)
	64	{
	65	struct amp_ctrl ctrl, n;
	66
	67	BT_DBG("mgr %p", mgr);
	68
	69	mutex_lock(&mgr->amp_ctrls_lock);
	70	list_for_each_entry_safe(ctrl, n, &mgr->amp_ctrls, list) {
	71	list_del(&ctrl->list);
	72	amp_ctrl_put(ctrl);
	73	}
	74	mutex_unlock(&mgr->amp_ctrls_lock);
	75	}
	76
	77	struct amp_ctrl amp_ctrl_lookup(struct amp_mgr mgr, u8 id)
	78	{
	79	struct amp_ctrl *ctrl;
	80
610850be	81	BT_DBG("mgr %p id %u", mgr, id);
52c0d6e5 AE	82
	83	mutex_lock(&mgr->amp_ctrls_lock);
	84	list_for_each_entry(ctrl, &mgr->amp_ctrls, list) {
	85	if (ctrl->id == id) {
	86	amp_ctrl_get(ctrl);
	87	mutex_unlock(&mgr->amp_ctrls_lock);
	88	return ctrl;
	89	}
	90	}
	91	mutex_unlock(&mgr->amp_ctrls_lock);
	92
	93	return NULL;
	94	}
	95
3161ae1c AE	96	/* Physical Link interface */
	97	static u8 __next_handle(struct amp_mgr *mgr)
	98	{
	99	if (++mgr->handle == 0)
	100	mgr->handle = 1;
	101
	102	return mgr->handle;
	103	}
	104
	105	struct hci_conn phylink_add(struct hci_dev hdev, struct amp_mgr *mgr,
a0c234fe	106	u8 remote_id, bool out)
3161ae1c	107	{
bdc8ead2	108	bdaddr_t *dst = &mgr->l2cap_conn->hcon->dst;
3161ae1c	109	struct hci_conn *hcon;
a5c4e309	110	u8 role = out ? HCI_ROLE_MASTER : HCI_ROLE_SLAVE;
3161ae1c	111
181a42ed	112	hcon = hci_conn_add(hdev, AMP_LINK, dst, role, __next_handle(mgr));
3161ae1c AE	113	if (!hcon)
	114	return NULL;
	115
a0c234fe AE	116	BT_DBG("hcon %p dst %pMR", hcon, dst);
a0c234fe AE	117
3161ae1c	118	hcon->state = BT_CONNECT;
3161ae1c	119	hcon->attempt++;
3161ae1c	120	hcon->remote_id = remote_id;
f706adfe	121	hcon->amp_mgr = amp_mgr_get(mgr);
3161ae1c AE	122
	123	return hcon;
	124	}
	125
ba221bba DK	126	/* AMP crypto key generation interface */
	127	static int hmac_sha256(u8 key, u8 ksize, char plaintext, u8 psize, u8 *output)
	128	{
ba221bba	129	struct crypto_shash *tfm;
252670c4	130	struct shash_desc *shash;
0a961a44	131	int ret;
ba221bba DK	132
	133	if (!ksize)
	134	return -EINVAL;
	135
	136	tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
	137	if (IS_ERR(tfm)) {
	138	BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
	139	return PTR_ERR(tfm);
	140	}
	141
	142	ret = crypto_shash_setkey(tfm, key, ksize);
	143	if (ret) {
	144	BT_DBG("crypto_ahash_setkey failed: err %d", ret);
252670c4 JH	145	goto failed;
252670c4 JH	146	}
ba221bba	147
252670c4 JH	148	shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm),
	149	GFP_KERNEL);
	150	if (!shash) {
	151	ret = -ENOMEM;
	152	goto failed;
ba221bba DK	153	}
ba221bba DK	154
252670c4	155	shash->tfm = tfm;
252670c4 JH	156
	157	ret = crypto_shash_digest(shash, plaintext, psize, output);
	158
	159	kfree(shash);
	160
	161	failed:
ba221bba DK	162	crypto_free_shash(tfm);
	163	return ret;
	164	}
	165
5a349186 AE	166	int phylink_gen_key(struct hci_conn conn, u8 data, u8 len, u8 type)
	167	{
	168	struct hci_dev *hdev = conn->hdev;
	169	struct link_key *key;
	170	u8 keybuf[HCI_AMP_LINK_KEY_SIZE];
	171	u8 gamp_key[HCI_AMP_LINK_KEY_SIZE];
	172	int err;
	173
	174	if (!hci_conn_check_link_mode(conn))
	175	return -EACCES;
	176
	177	BT_DBG("conn %p key_type %d", conn, conn->key_type);
	178
	179	/* Legacy key */
	180	if (conn->key_type < 3) {
610850be	181	bt_dev_err(hdev, "legacy key type %u", conn->key_type);
5a349186 AE	182	return -EACCES;
	183	}
	184
	185	*type = conn->key_type;
	186	*len = HCI_AMP_LINK_KEY_SIZE;
	187
	188	key = hci_find_link_key(hdev, &conn->dst);
079db0c6 AE	189	if (!key) {
	190	BT_DBG("No Link key for conn %p dst %pMR", conn, &conn->dst);
	191	return -EACCES;
	192	}
5a349186 AE	193
	194	/* BR/EDR Link Key concatenated together with itself */
	195	memcpy(&keybuf[0], key->val, HCI_LINK_KEY_SIZE);
	196	memcpy(&keybuf[HCI_LINK_KEY_SIZE], key->val, HCI_LINK_KEY_SIZE);
	197
	198	/* Derive Generic AMP Link Key (gamp) */
	199	err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
	200	if (err) {
2064ee33	201	bt_dev_err(hdev, "could not derive Generic AMP Key: err %d", err);
5a349186 AE	202	return err;
	203	}
	204
	205	if (conn->key_type == HCI_LK_DEBUG_COMBINATION) {
	206	BT_DBG("Use Generic AMP Key (gamp)");
	207	memcpy(data, gamp_key, HCI_AMP_LINK_KEY_SIZE);
	208	return err;
	209	}
	210
	211	/* Derive Dedicated AMP Link Key: "802b" is 802.11 PAL keyID */
	212	return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
	213	}
	214
b3d39140 AW	215	static void read_local_amp_assoc_complete(struct hci_dev *hdev, u8 status,
	216	u16 opcode, struct sk_buff *skb)
	217	{
	218	struct hci_rp_read_local_amp_assoc rp = (void )skb->data;
	219	struct amp_assoc *assoc = &hdev->loc_assoc;
	220	size_t rem_len, frag_len;
	221
	222	BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
	223
	224	if (rp->status)
	225	goto send_rsp;
	226
	227	frag_len = skb->len - sizeof(*rp);
	228	rem_len = __le16_to_cpu(rp->rem_len);
	229
	230	if (rem_len > frag_len) {
	231	BT_DBG("frag_len %zu rem_len %zu", frag_len, rem_len);
	232
	233	memcpy(assoc->data + assoc->offset, rp->frag, frag_len);
	234	assoc->offset += frag_len;
	235
	236	/* Read other fragments */
	237	amp_read_loc_assoc_frag(hdev, rp->phy_handle);
	238
	239	return;
	240	}
	241
	242	memcpy(assoc->data + assoc->offset, rp->frag, rem_len);
	243	assoc->len = assoc->offset + rem_len;
	244	assoc->offset = 0;
	245
	246	send_rsp:
	247	/* Send A2MP Rsp when all fragments are received */
	248	a2mp_send_getampassoc_rsp(hdev, rp->status);
	249	a2mp_send_create_phy_link_req(hdev, rp->status);
	250	}
	251
903e4541 AE	252	void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
	253	{
	254	struct hci_cp_read_local_amp_assoc cp;
	255	struct amp_assoc *loc_assoc = &hdev->loc_assoc;
b3d39140	256	struct hci_request req;
cd50361c	257	int err;
903e4541	258
610850be	259	BT_DBG("%s handle %u", hdev->name, phy_handle);
903e4541 AE	260
	261	cp.phy_handle = phy_handle;
	262	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	263	cp.len_so_far = cpu_to_le16(loc_assoc->offset);
	264
b3d39140 AW	265	hci_req_init(&req, hdev);
	266	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	267	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
	268	if (err < 0)
	269	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
903e4541 AE	270	}
	271
	272	void amp_read_loc_assoc(struct hci_dev hdev, struct amp_mgr mgr)
	273	{
	274	struct hci_cp_read_local_amp_assoc cp;
b3d39140	275	struct hci_request req;
cd50361c	276	int err;
903e4541 AE	277
	278	memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
	279	memset(&cp, 0, sizeof(cp));
	280
	281	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	282
cb6801c6	283	set_bit(READ_LOC_AMP_ASSOC, &mgr->state);
b3d39140 AW	284	hci_req_init(&req, hdev);
b3d39140 AW	285	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
cd50361c	286	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
b3d39140 AW	287	if (err < 0)
b3d39140 AW	288	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
903e4541	289	}
a02226d6	290
9495b2ee AE	291	void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
	292	struct hci_conn *hcon)
	293	{
	294	struct hci_cp_read_local_amp_assoc cp;
	295	struct amp_mgr *mgr = hcon->amp_mgr;
b3d39140	296	struct hci_request req;
cd50361c	297	int err;
9495b2ee	298
e8bd76ed GT	299	if (!mgr)
	300	return;
	301
9495b2ee AE	302	cp.phy_handle = hcon->handle;
	303	cp.len_so_far = cpu_to_le16(0);
	304	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	305
cb6801c6	306	set_bit(READ_LOC_AMP_ASSOC_FINAL, &mgr->state);
9495b2ee AE	307
9495b2ee AE	308	/* Read Local AMP Assoc final link information data */
b3d39140 AW	309	hci_req_init(&req, hdev);
b3d39140 AW	310	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
cd50361c	311	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
b3d39140 AW	312	if (err < 0)
	313	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
	314	}
	315
	316	static void write_remote_amp_assoc_complete(struct hci_dev *hdev, u8 status,
	317	u16 opcode, struct sk_buff *skb)
	318	{
	319	struct hci_rp_write_remote_amp_assoc rp = (void )skb->data;
	320
	321	BT_DBG("%s status 0x%2.2x phy_handle 0x%2.2x",
	322	hdev->name, rp->status, rp->phy_handle);
	323
	324	if (rp->status)
	325	return;
	326
	327	amp_write_rem_assoc_continue(hdev, rp->phy_handle);
9495b2ee	328	}
93c284ee AE	329
	330	/* Write AMP Assoc data fragments, returns true with last fragment written*/
	331	static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
	332	struct hci_conn *hcon)
	333	{
	334	struct hci_cp_write_remote_amp_assoc *cp;
	335	struct amp_mgr *mgr = hcon->amp_mgr;
	336	struct amp_ctrl *ctrl;
b3d39140	337	struct hci_request req;
93c284ee AE	338	u16 frag_len, len;
	339
	340	ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
	341	if (!ctrl)
	342	return false;
	343
	344	if (!ctrl->assoc_rem_len) {
	345	BT_DBG("all fragments are written");
	346	ctrl->assoc_rem_len = ctrl->assoc_len;
	347	ctrl->assoc_len_so_far = 0;
	348
	349	amp_ctrl_put(ctrl);
	350	return true;
	351	}
	352
	353	frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
	354	len = frag_len + sizeof(*cp);
	355
	356	cp = kzalloc(len, GFP_KERNEL);
	357	if (!cp) {
	358	amp_ctrl_put(ctrl);
	359	return false;
	360	}
	361
	362	BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
	363	hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);
	364
	365	cp->phy_handle = hcon->handle;
	366	cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
	367	cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
	368	memcpy(cp->frag, ctrl->assoc, frag_len);
	369
	370	ctrl->assoc_len_so_far += frag_len;
	371	ctrl->assoc_rem_len -= frag_len;
	372
	373	amp_ctrl_put(ctrl);
	374
b3d39140	375	hci_req_init(&req, hdev);
0208bc88	376	hci_req_add(&req, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
b3d39140	377	hci_req_run_skb(&req, write_remote_amp_assoc_complete);
93c284ee AE	378
	379	kfree(cp);
	380
	381	return false;
	382	}
	383
	384	void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
	385	{
	386	struct hci_conn *hcon;
	387
	388	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	389
	390	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	391	if (!hcon)
	392	return;
	393
8e05e3ba AE	394	/* Send A2MP create phylink rsp when all fragments are written */
	395	if (amp_write_rem_assoc_frag(hdev, hcon))
	396	a2mp_send_create_phy_link_rsp(hdev, 0);
93c284ee AE	397	}
	398
	399	void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
	400	{
	401	struct hci_conn *hcon;
	402
	403	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	404
	405	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	406	if (!hcon)
	407	return;
	408
	409	BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);
	410
	411	amp_write_rem_assoc_frag(hdev, hcon);
	412	}
	413
df9b89c7 AW	414	static void create_phylink_complete(struct hci_dev *hdev, u8 status,
	415	u16 opcode)
	416	{
	417	struct hci_cp_create_phy_link *cp;
	418
	419	BT_DBG("%s status 0x%2.2x", hdev->name, status);
	420
	421	cp = hci_sent_cmd_data(hdev, HCI_OP_CREATE_PHY_LINK);
	422	if (!cp)
	423	return;
	424
	425	hci_dev_lock(hdev);
	426
	427	if (status) {
	428	struct hci_conn *hcon;
	429
	430	hcon = hci_conn_hash_lookup_handle(hdev, cp->phy_handle);
	431	if (hcon)
	432	hci_conn_del(hcon);
	433	} else {
	434	amp_write_remote_assoc(hdev, cp->phy_handle);
	435	}
	436
	437	hci_dev_unlock(hdev);
	438	}
	439
a02226d6 AE	440	void amp_create_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	441	struct hci_conn *hcon)
	442	{
	443	struct hci_cp_create_phy_link cp;
df9b89c7	444	struct hci_request req;
a02226d6 AE	445
	446	cp.phy_handle = hcon->handle;
	447
	448	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	449	hcon->handle);
	450
	451	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	452	&cp.key_type)) {
	453	BT_DBG("Cannot create link key");
	454	return;
	455	}
	456
df9b89c7 AW	457	hci_req_init(&req, hdev);
	458	hci_req_add(&req, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
	459	hci_req_run(&req, create_phylink_complete);
	460	}
	461
	462	static void accept_phylink_complete(struct hci_dev *hdev, u8 status,
	463	u16 opcode)
	464	{
	465	struct hci_cp_accept_phy_link *cp;
	466
	467	BT_DBG("%s status 0x%2.2x", hdev->name, status);
	468
	469	if (status)
	470	return;
	471
	472	cp = hci_sent_cmd_data(hdev, HCI_OP_ACCEPT_PHY_LINK);
	473	if (!cp)
	474	return;
	475
	476	amp_write_remote_assoc(hdev, cp->phy_handle);
a02226d6	477	}
dffa3871 AE	478
	479	void amp_accept_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	480	struct hci_conn *hcon)
	481	{
	482	struct hci_cp_accept_phy_link cp;
df9b89c7	483	struct hci_request req;
dffa3871 AE	484
	485	cp.phy_handle = hcon->handle;
	486
	487	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	488	hcon->handle);
	489
	490	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	491	&cp.key_type)) {
	492	BT_DBG("Cannot create link key");
	493	return;
	494	}
	495
df9b89c7 AW	496	hci_req_init(&req, hdev);
	497	hci_req_add(&req, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
	498	hci_req_run(&req, accept_phylink_complete);
dffa3871	499	}
5ce66b59	500
cf70ff22 AE	501	void amp_physical_cfm(struct hci_conn bredr_hcon, struct hci_conn hs_hcon)
	502	{
	503	struct hci_dev *bredr_hdev = hci_dev_hold(bredr_hcon->hdev);
	504	struct amp_mgr *mgr = hs_hcon->amp_mgr;
	505	struct l2cap_chan *bredr_chan;
	506
	507	BT_DBG("bredr_hcon %p hs_hcon %p mgr %p", bredr_hcon, hs_hcon, mgr);
	508
	509	if (!bredr_hdev \|\| !mgr \|\| !mgr->bredr_chan)
	510	return;
	511
	512	bredr_chan = mgr->bredr_chan;
	513
a514b17f AE	514	l2cap_chan_lock(bredr_chan);
a514b17f AE	515
cf70ff22	516	set_bit(FLAG_EFS_ENABLE, &bredr_chan->flags);
fffadc08	517	bredr_chan->remote_amp_id = hs_hcon->remote_id;
37295996	518	bredr_chan->local_amp_id = hs_hcon->hdev->id;
cf70ff22 AE	519	bredr_chan->hs_hcon = hs_hcon;
cf70ff22 AE	520	bredr_chan->conn->mtu = hs_hcon->hdev->block_mtu;
cf70ff22	521
a514b17f AE	522	__l2cap_physical_cfm(bredr_chan, 0);
	523
	524	l2cap_chan_unlock(bredr_chan);
cf70ff22 AE	525
	526	hci_dev_put(bredr_hdev);
	527	}
	528
5ce66b59 AE	529	void amp_create_logical_link(struct l2cap_chan *chan)
5ce66b59 AE	530	{
7a9898c6	531	struct hci_conn *hs_hcon = chan->hs_hcon;
5ce66b59	532	struct hci_cp_create_accept_logical_link cp;
5ce66b59 AE	533	struct hci_dev *hdev;
5ce66b59 AE	534
bdc8ead2 MH	535	BT_DBG("chan %p hs_hcon %p dst %pMR", chan, hs_hcon,
bdc8ead2 MH	536	&chan->conn->hcon->dst);
5ce66b59	537
7a9898c6	538	if (!hs_hcon)
5ce66b59 AE	539	return;
	540
	541	hdev = hci_dev_hold(chan->hs_hcon->hdev);
	542	if (!hdev)
	543	return;
	544
7a9898c6	545	cp.phy_handle = hs_hcon->handle;
5ce66b59 AE	546
	547	cp.tx_flow_spec.id = chan->local_id;
	548	cp.tx_flow_spec.stype = chan->local_stype;
	549	cp.tx_flow_spec.msdu = cpu_to_le16(chan->local_msdu);
	550	cp.tx_flow_spec.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
	551	cp.tx_flow_spec.acc_lat = cpu_to_le32(chan->local_acc_lat);
	552	cp.tx_flow_spec.flush_to = cpu_to_le32(chan->local_flush_to);
	553
	554	cp.rx_flow_spec.id = chan->remote_id;
	555	cp.rx_flow_spec.stype = chan->remote_stype;
	556	cp.rx_flow_spec.msdu = cpu_to_le16(chan->remote_msdu);
	557	cp.rx_flow_spec.sdu_itime = cpu_to_le32(chan->remote_sdu_itime);
	558	cp.rx_flow_spec.acc_lat = cpu_to_le32(chan->remote_acc_lat);
	559	cp.rx_flow_spec.flush_to = cpu_to_le32(chan->remote_flush_to);
	560
7a9898c6	561	if (hs_hcon->out)
5ce66b59 AE	562	hci_send_cmd(hdev, HCI_OP_CREATE_LOGICAL_LINK, sizeof(cp),
	563	&cp);
	564	else
	565	hci_send_cmd(hdev, HCI_OP_ACCEPT_LOGICAL_LINK, sizeof(cp),
	566	&cp);
	567
5ce66b59 AE	568	hci_dev_put(hdev);
5ce66b59 AE	569	}
606e2a10	570
419e08c1 AE	571	void amp_disconnect_logical_link(struct hci_chan *hchan)
	572	{
	573	struct hci_conn *hcon = hchan->conn;
	574	struct hci_cp_disconn_logical_link cp;
	575
	576	if (hcon->state != BT_CONNECTED) {
	577	BT_DBG("hchan %p not connected", hchan);
	578	return;
	579	}
	580
	581	cp.log_handle = cpu_to_le16(hchan->handle);
	582	hci_send_cmd(hcon->hdev, HCI_OP_DISCONN_LOGICAL_LINK, sizeof(cp), &cp);
	583	}
	584
606e2a10 AE	585	void amp_destroy_logical_link(struct hci_chan *hchan, u8 reason)
	586	{
	587	BT_DBG("hchan %p", hchan);
	588
	589	hci_chan_del(hchan);
	590	}