[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);
	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 %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
a5c4e309	112	hcon = hci_conn_add(hdev, AMP_LINK, dst, role);
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 AE	119	hcon->attempt++;
	120	hcon->handle = __next_handle(mgr);
	121	hcon->remote_id = remote_id;
f706adfe	122	hcon->amp_mgr = amp_mgr_get(mgr);
3161ae1c AE	123
	124	return hcon;
	125	}
	126
ba221bba DK	127	/* AMP crypto key generation interface */
	128	static int hmac_sha256(u8 key, u8 ksize, char plaintext, u8 psize, u8 *output)
	129	{
ba221bba	130	struct crypto_shash *tfm;
252670c4	131	struct shash_desc *shash;
0a961a44	132	int ret;
ba221bba DK	133
	134	if (!ksize)
	135	return -EINVAL;
	136
	137	tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
	138	if (IS_ERR(tfm)) {
	139	BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
	140	return PTR_ERR(tfm);
	141	}
	142
	143	ret = crypto_shash_setkey(tfm, key, ksize);
	144	if (ret) {
	145	BT_DBG("crypto_ahash_setkey failed: err %d", ret);
252670c4 JH	146	goto failed;
252670c4 JH	147	}
ba221bba	148
252670c4 JH	149	shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm),
	150	GFP_KERNEL);
	151	if (!shash) {
	152	ret = -ENOMEM;
	153	goto failed;
ba221bba DK	154	}
ba221bba DK	155
252670c4	156	shash->tfm = tfm;
252670c4 JH	157
	158	ret = crypto_shash_digest(shash, plaintext, psize, output);
	159
	160	kfree(shash);
	161
	162	failed:
ba221bba DK	163	crypto_free_shash(tfm);
	164	return ret;
	165	}
	166
5a349186 AE	167	int phylink_gen_key(struct hci_conn conn, u8 data, u8 len, u8 type)
	168	{
	169	struct hci_dev *hdev = conn->hdev;
	170	struct link_key *key;
	171	u8 keybuf[HCI_AMP_LINK_KEY_SIZE];
	172	u8 gamp_key[HCI_AMP_LINK_KEY_SIZE];
	173	int err;
	174
	175	if (!hci_conn_check_link_mode(conn))
	176	return -EACCES;
	177
	178	BT_DBG("conn %p key_type %d", conn, conn->key_type);
	179
	180	/* Legacy key */
	181	if (conn->key_type < 3) {
610850be	182	bt_dev_err(hdev, "legacy key type %u", conn->key_type);
5a349186 AE	183	return -EACCES;
	184	}
	185
	186	*type = conn->key_type;
	187	*len = HCI_AMP_LINK_KEY_SIZE;
	188
	189	key = hci_find_link_key(hdev, &conn->dst);
079db0c6 AE	190	if (!key) {
	191	BT_DBG("No Link key for conn %p dst %pMR", conn, &conn->dst);
	192	return -EACCES;
	193	}
5a349186 AE	194
	195	/* BR/EDR Link Key concatenated together with itself */
	196	memcpy(&keybuf[0], key->val, HCI_LINK_KEY_SIZE);
	197	memcpy(&keybuf[HCI_LINK_KEY_SIZE], key->val, HCI_LINK_KEY_SIZE);
	198
	199	/* Derive Generic AMP Link Key (gamp) */
	200	err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
	201	if (err) {
2064ee33	202	bt_dev_err(hdev, "could not derive Generic AMP Key: err %d", err);
5a349186 AE	203	return err;
	204	}
	205
	206	if (conn->key_type == HCI_LK_DEBUG_COMBINATION) {
	207	BT_DBG("Use Generic AMP Key (gamp)");
	208	memcpy(data, gamp_key, HCI_AMP_LINK_KEY_SIZE);
	209	return err;
	210	}
	211
	212	/* Derive Dedicated AMP Link Key: "802b" is 802.11 PAL keyID */
	213	return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
	214	}
	215
b3d39140 AW	216	static void read_local_amp_assoc_complete(struct hci_dev *hdev, u8 status,
	217	u16 opcode, struct sk_buff *skb)
	218	{
	219	struct hci_rp_read_local_amp_assoc rp = (void )skb->data;
	220	struct amp_assoc *assoc = &hdev->loc_assoc;
	221	size_t rem_len, frag_len;
	222
	223	BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
	224
	225	if (rp->status)
	226	goto send_rsp;
	227
	228	frag_len = skb->len - sizeof(*rp);
	229	rem_len = __le16_to_cpu(rp->rem_len);
	230
	231	if (rem_len > frag_len) {
	232	BT_DBG("frag_len %zu rem_len %zu", frag_len, rem_len);
	233
	234	memcpy(assoc->data + assoc->offset, rp->frag, frag_len);
	235	assoc->offset += frag_len;
	236
	237	/* Read other fragments */
	238	amp_read_loc_assoc_frag(hdev, rp->phy_handle);
	239
	240	return;
	241	}
	242
	243	memcpy(assoc->data + assoc->offset, rp->frag, rem_len);
	244	assoc->len = assoc->offset + rem_len;
	245	assoc->offset = 0;
	246
	247	send_rsp:
	248	/* Send A2MP Rsp when all fragments are received */
	249	a2mp_send_getampassoc_rsp(hdev, rp->status);
	250	a2mp_send_create_phy_link_req(hdev, rp->status);
	251	}
	252
903e4541 AE	253	void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
	254	{
	255	struct hci_cp_read_local_amp_assoc cp;
	256	struct amp_assoc *loc_assoc = &hdev->loc_assoc;
b3d39140	257	struct hci_request req;
cd50361c	258	int err;
903e4541	259
610850be	260	BT_DBG("%s handle %u", hdev->name, phy_handle);
903e4541 AE	261
	262	cp.phy_handle = phy_handle;
	263	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	264	cp.len_so_far = cpu_to_le16(loc_assoc->offset);
	265
b3d39140 AW	266	hci_req_init(&req, hdev);
	267	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
	268	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
	269	if (err < 0)
	270	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
903e4541 AE	271	}
	272
	273	void amp_read_loc_assoc(struct hci_dev hdev, struct amp_mgr mgr)
	274	{
	275	struct hci_cp_read_local_amp_assoc cp;
b3d39140	276	struct hci_request req;
cd50361c	277	int err;
903e4541 AE	278
	279	memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
	280	memset(&cp, 0, sizeof(cp));
	281
	282	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	283
cb6801c6	284	set_bit(READ_LOC_AMP_ASSOC, &mgr->state);
b3d39140 AW	285	hci_req_init(&req, hdev);
b3d39140 AW	286	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
cd50361c	287	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
b3d39140 AW	288	if (err < 0)
b3d39140 AW	289	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
903e4541	290	}
a02226d6	291
9495b2ee AE	292	void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
	293	struct hci_conn *hcon)
	294	{
	295	struct hci_cp_read_local_amp_assoc cp;
	296	struct amp_mgr *mgr = hcon->amp_mgr;
b3d39140	297	struct hci_request req;
cd50361c	298	int err;
9495b2ee	299
e8bd76ed GT	300	if (!mgr)
	301	return;
	302
9495b2ee AE	303	cp.phy_handle = hcon->handle;
	304	cp.len_so_far = cpu_to_le16(0);
	305	cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
	306
cb6801c6	307	set_bit(READ_LOC_AMP_ASSOC_FINAL, &mgr->state);
9495b2ee AE	308
9495b2ee AE	309	/* Read Local AMP Assoc final link information data */
b3d39140 AW	310	hci_req_init(&req, hdev);
b3d39140 AW	311	hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
cd50361c	312	err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
b3d39140 AW	313	if (err < 0)
	314	a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
	315	}
	316
	317	static void write_remote_amp_assoc_complete(struct hci_dev *hdev, u8 status,
	318	u16 opcode, struct sk_buff *skb)
	319	{
	320	struct hci_rp_write_remote_amp_assoc rp = (void )skb->data;
	321
	322	BT_DBG("%s status 0x%2.2x phy_handle 0x%2.2x",
	323	hdev->name, rp->status, rp->phy_handle);
	324
	325	if (rp->status)
	326	return;
	327
	328	amp_write_rem_assoc_continue(hdev, rp->phy_handle);
9495b2ee	329	}
93c284ee AE	330
	331	/* Write AMP Assoc data fragments, returns true with last fragment written*/
	332	static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
	333	struct hci_conn *hcon)
	334	{
	335	struct hci_cp_write_remote_amp_assoc *cp;
	336	struct amp_mgr *mgr = hcon->amp_mgr;
	337	struct amp_ctrl *ctrl;
b3d39140	338	struct hci_request req;
93c284ee AE	339	u16 frag_len, len;
	340
	341	ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
	342	if (!ctrl)
	343	return false;
	344
	345	if (!ctrl->assoc_rem_len) {
	346	BT_DBG("all fragments are written");
	347	ctrl->assoc_rem_len = ctrl->assoc_len;
	348	ctrl->assoc_len_so_far = 0;
	349
	350	amp_ctrl_put(ctrl);
	351	return true;
	352	}
	353
	354	frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
	355	len = frag_len + sizeof(*cp);
	356
	357	cp = kzalloc(len, GFP_KERNEL);
	358	if (!cp) {
	359	amp_ctrl_put(ctrl);
	360	return false;
	361	}
	362
	363	BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
	364	hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);
	365
	366	cp->phy_handle = hcon->handle;
	367	cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
	368	cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
	369	memcpy(cp->frag, ctrl->assoc, frag_len);
	370
	371	ctrl->assoc_len_so_far += frag_len;
	372	ctrl->assoc_rem_len -= frag_len;
	373
	374	amp_ctrl_put(ctrl);
	375
b3d39140	376	hci_req_init(&req, hdev);
0208bc88	377	hci_req_add(&req, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
b3d39140	378	hci_req_run_skb(&req, write_remote_amp_assoc_complete);
93c284ee AE	379
	380	kfree(cp);
	381
	382	return false;
	383	}
	384
	385	void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
	386	{
	387	struct hci_conn *hcon;
	388
	389	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	390
	391	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	392	if (!hcon)
	393	return;
	394
8e05e3ba AE	395	/* Send A2MP create phylink rsp when all fragments are written */
	396	if (amp_write_rem_assoc_frag(hdev, hcon))
	397	a2mp_send_create_phy_link_rsp(hdev, 0);
93c284ee AE	398	}
	399
	400	void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
	401	{
	402	struct hci_conn *hcon;
	403
	404	BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
	405
	406	hcon = hci_conn_hash_lookup_handle(hdev, handle);
	407	if (!hcon)
	408	return;
	409
	410	BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);
	411
	412	amp_write_rem_assoc_frag(hdev, hcon);
	413	}
	414
df9b89c7 AW	415	static void create_phylink_complete(struct hci_dev *hdev, u8 status,
	416	u16 opcode)
	417	{
	418	struct hci_cp_create_phy_link *cp;
	419
	420	BT_DBG("%s status 0x%2.2x", hdev->name, status);
	421
	422	cp = hci_sent_cmd_data(hdev, HCI_OP_CREATE_PHY_LINK);
	423	if (!cp)
	424	return;
	425
	426	hci_dev_lock(hdev);
	427
	428	if (status) {
	429	struct hci_conn *hcon;
	430
	431	hcon = hci_conn_hash_lookup_handle(hdev, cp->phy_handle);
	432	if (hcon)
	433	hci_conn_del(hcon);
	434	} else {
	435	amp_write_remote_assoc(hdev, cp->phy_handle);
	436	}
	437
	438	hci_dev_unlock(hdev);
	439	}
	440
a02226d6 AE	441	void amp_create_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	442	struct hci_conn *hcon)
	443	{
	444	struct hci_cp_create_phy_link cp;
df9b89c7	445	struct hci_request req;
a02226d6 AE	446
	447	cp.phy_handle = hcon->handle;
	448
	449	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	450	hcon->handle);
	451
	452	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	453	&cp.key_type)) {
	454	BT_DBG("Cannot create link key");
	455	return;
	456	}
	457
df9b89c7 AW	458	hci_req_init(&req, hdev);
	459	hci_req_add(&req, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
	460	hci_req_run(&req, create_phylink_complete);
	461	}
	462
	463	static void accept_phylink_complete(struct hci_dev *hdev, u8 status,
	464	u16 opcode)
	465	{
	466	struct hci_cp_accept_phy_link *cp;
	467
	468	BT_DBG("%s status 0x%2.2x", hdev->name, status);
	469
	470	if (status)
	471	return;
	472
	473	cp = hci_sent_cmd_data(hdev, HCI_OP_ACCEPT_PHY_LINK);
	474	if (!cp)
	475	return;
	476
	477	amp_write_remote_assoc(hdev, cp->phy_handle);
a02226d6	478	}
dffa3871 AE	479
	480	void amp_accept_phylink(struct hci_dev hdev, struct amp_mgr mgr,
	481	struct hci_conn *hcon)
	482	{
	483	struct hci_cp_accept_phy_link cp;
df9b89c7	484	struct hci_request req;
dffa3871 AE	485
	486	cp.phy_handle = hcon->handle;
	487
	488	BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
	489	hcon->handle);
	490
	491	if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
	492	&cp.key_type)) {
	493	BT_DBG("Cannot create link key");
	494	return;
	495	}
	496
df9b89c7 AW	497	hci_req_init(&req, hdev);
	498	hci_req_add(&req, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
	499	hci_req_run(&req, accept_phylink_complete);
dffa3871	500	}
5ce66b59	501
cf70ff22 AE	502	void amp_physical_cfm(struct hci_conn bredr_hcon, struct hci_conn hs_hcon)
	503	{
	504	struct hci_dev *bredr_hdev = hci_dev_hold(bredr_hcon->hdev);
	505	struct amp_mgr *mgr = hs_hcon->amp_mgr;
	506	struct l2cap_chan *bredr_chan;
	507
	508	BT_DBG("bredr_hcon %p hs_hcon %p mgr %p", bredr_hcon, hs_hcon, mgr);
	509
	510	if (!bredr_hdev \|\| !mgr \|\| !mgr->bredr_chan)
	511	return;
	512
	513	bredr_chan = mgr->bredr_chan;
	514
a514b17f AE	515	l2cap_chan_lock(bredr_chan);
a514b17f AE	516
cf70ff22	517	set_bit(FLAG_EFS_ENABLE, &bredr_chan->flags);
fffadc08	518	bredr_chan->remote_amp_id = hs_hcon->remote_id;
37295996	519	bredr_chan->local_amp_id = hs_hcon->hdev->id;
cf70ff22 AE	520	bredr_chan->hs_hcon = hs_hcon;
cf70ff22 AE	521	bredr_chan->conn->mtu = hs_hcon->hdev->block_mtu;
cf70ff22	522
a514b17f AE	523	__l2cap_physical_cfm(bredr_chan, 0);
	524
	525	l2cap_chan_unlock(bredr_chan);
cf70ff22 AE	526
	527	hci_dev_put(bredr_hdev);
	528	}
	529
5ce66b59 AE	530	void amp_create_logical_link(struct l2cap_chan *chan)
5ce66b59 AE	531	{
7a9898c6	532	struct hci_conn *hs_hcon = chan->hs_hcon;
5ce66b59	533	struct hci_cp_create_accept_logical_link cp;
5ce66b59 AE	534	struct hci_dev *hdev;
5ce66b59 AE	535
bdc8ead2 MH	536	BT_DBG("chan %p hs_hcon %p dst %pMR", chan, hs_hcon,
bdc8ead2 MH	537	&chan->conn->hcon->dst);
5ce66b59	538
7a9898c6	539	if (!hs_hcon)
5ce66b59 AE	540	return;
	541
	542	hdev = hci_dev_hold(chan->hs_hcon->hdev);
	543	if (!hdev)
	544	return;
	545
7a9898c6	546	cp.phy_handle = hs_hcon->handle;
5ce66b59 AE	547
	548	cp.tx_flow_spec.id = chan->local_id;
	549	cp.tx_flow_spec.stype = chan->local_stype;
	550	cp.tx_flow_spec.msdu = cpu_to_le16(chan->local_msdu);
	551	cp.tx_flow_spec.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
	552	cp.tx_flow_spec.acc_lat = cpu_to_le32(chan->local_acc_lat);
	553	cp.tx_flow_spec.flush_to = cpu_to_le32(chan->local_flush_to);
	554
	555	cp.rx_flow_spec.id = chan->remote_id;
	556	cp.rx_flow_spec.stype = chan->remote_stype;
	557	cp.rx_flow_spec.msdu = cpu_to_le16(chan->remote_msdu);
	558	cp.rx_flow_spec.sdu_itime = cpu_to_le32(chan->remote_sdu_itime);
	559	cp.rx_flow_spec.acc_lat = cpu_to_le32(chan->remote_acc_lat);
	560	cp.rx_flow_spec.flush_to = cpu_to_le32(chan->remote_flush_to);
	561
7a9898c6	562	if (hs_hcon->out)
5ce66b59 AE	563	hci_send_cmd(hdev, HCI_OP_CREATE_LOGICAL_LINK, sizeof(cp),
	564	&cp);
	565	else
	566	hci_send_cmd(hdev, HCI_OP_ACCEPT_LOGICAL_LINK, sizeof(cp),
	567	&cp);
	568
5ce66b59 AE	569	hci_dev_put(hdev);
5ce66b59 AE	570	}
606e2a10	571
419e08c1 AE	572	void amp_disconnect_logical_link(struct hci_chan *hchan)
	573	{
	574	struct hci_conn *hcon = hchan->conn;
	575	struct hci_cp_disconn_logical_link cp;
	576
	577	if (hcon->state != BT_CONNECTED) {
	578	BT_DBG("hchan %p not connected", hchan);
	579	return;
	580	}
	581
	582	cp.log_handle = cpu_to_le16(hchan->handle);
	583	hci_send_cmd(hcon->hdev, HCI_OP_DISCONN_LOGICAL_LINK, sizeof(cp), &cp);
	584	}
	585
606e2a10 AE	586	void amp_destroy_logical_link(struct hci_chan *hchan, u8 reason)
	587	{
	588	BT_DBG("hchan %p", hchan);
	589
	590	hci_chan_del(hchan);
	591	}