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-rw-r--r--net/bluetooth/hidp/Kconfig13
-rw-r--r--net/bluetooth/hidp/Makefile8
-rw-r--r--net/bluetooth/hidp/core.c1479
-rw-r--r--net/bluetooth/hidp/hidp.h192
-rw-r--r--net/bluetooth/hidp/sock.c312
5 files changed, 2004 insertions, 0 deletions
diff --git a/net/bluetooth/hidp/Kconfig b/net/bluetooth/hidp/Kconfig
new file mode 100644
index 0000000000..6746be07e2
--- /dev/null
+++ b/net/bluetooth/hidp/Kconfig
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config BT_HIDP
+ tristate "HIDP protocol support"
+ depends on BT_BREDR && INPUT && HID_SUPPORT
+ select HID
+ help
+ HIDP (Human Interface Device Protocol) is a transport layer
+ for HID reports. HIDP is required for the Bluetooth Human
+ Interface Device Profile.
+
+ Say Y here to compile HIDP support into the kernel or say M to
+ compile it as module (hidp).
+
diff --git a/net/bluetooth/hidp/Makefile b/net/bluetooth/hidp/Makefile
new file mode 100644
index 0000000000..f41b0aa02b
--- /dev/null
+++ b/net/bluetooth/hidp/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the Linux Bluetooth HIDP layer
+#
+
+obj-$(CONFIG_BT_HIDP) += hidp.o
+
+hidp-objs := core.o sock.o
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
new file mode 100644
index 0000000000..707f229f89
--- /dev/null
+++ b/net/bluetooth/hidp/core.c
@@ -0,0 +1,1479 @@
+/*
+ HIDP implementation for Linux Bluetooth stack (BlueZ).
+ Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org>
+ Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License version 2 as
+ published by the Free Software Foundation;
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+ IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
+ CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
+ COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
+ SOFTWARE IS DISCLAIMED.
+*/
+
+#include <linux/kref.h>
+#include <linux/module.h>
+#include <linux/file.h>
+#include <linux/kthread.h>
+#include <linux/hidraw.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/l2cap.h>
+
+#include "hidp.h"
+
+#define VERSION "1.2"
+
+static DECLARE_RWSEM(hidp_session_sem);
+static DECLARE_WAIT_QUEUE_HEAD(hidp_session_wq);
+static LIST_HEAD(hidp_session_list);
+
+static unsigned char hidp_keycode[256] = {
+ 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36,
+ 37, 38, 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45,
+ 21, 44, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 1,
+ 14, 15, 57, 12, 13, 26, 27, 43, 43, 39, 40, 41, 51, 52,
+ 53, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88,
+ 99, 70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69,
+ 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71, 72, 73,
+ 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190,
+ 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135,
+ 136, 113, 115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94,
+ 95, 0, 0, 0, 122, 123, 90, 91, 85, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115,
+ 114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140
+};
+
+static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 };
+
+static int hidp_session_probe(struct l2cap_conn *conn,
+ struct l2cap_user *user);
+static void hidp_session_remove(struct l2cap_conn *conn,
+ struct l2cap_user *user);
+static int hidp_session_thread(void *arg);
+static void hidp_session_terminate(struct hidp_session *s);
+
+static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
+{
+ u32 valid_flags = 0;
+ memset(ci, 0, sizeof(*ci));
+ bacpy(&ci->bdaddr, &session->bdaddr);
+
+ ci->flags = session->flags & valid_flags;
+ ci->state = BT_CONNECTED;
+
+ if (session->input) {
+ ci->vendor = session->input->id.vendor;
+ ci->product = session->input->id.product;
+ ci->version = session->input->id.version;
+ if (session->input->name)
+ strscpy(ci->name, session->input->name, 128);
+ else
+ strscpy(ci->name, "HID Boot Device", 128);
+ } else if (session->hid) {
+ ci->vendor = session->hid->vendor;
+ ci->product = session->hid->product;
+ ci->version = session->hid->version;
+ strscpy(ci->name, session->hid->name, 128);
+ }
+}
+
+/* assemble skb, queue message on @transmit and wake up the session thread */
+static int hidp_send_message(struct hidp_session *session, struct socket *sock,
+ struct sk_buff_head *transmit, unsigned char hdr,
+ const unsigned char *data, int size)
+{
+ struct sk_buff *skb;
+ struct sock *sk = sock->sk;
+ int ret;
+
+ BT_DBG("session %p data %p size %d", session, data, size);
+
+ if (atomic_read(&session->terminate))
+ return -EIO;
+
+ skb = alloc_skb(size + 1, GFP_ATOMIC);
+ if (!skb) {
+ BT_ERR("Can't allocate memory for new frame");
+ return -ENOMEM;
+ }
+
+ skb_put_u8(skb, hdr);
+ if (data && size > 0) {
+ skb_put_data(skb, data, size);
+ ret = size;
+ } else {
+ ret = 0;
+ }
+
+ skb_queue_tail(transmit, skb);
+ wake_up_interruptible(sk_sleep(sk));
+
+ return ret;
+}
+
+static int hidp_send_ctrl_message(struct hidp_session *session,
+ unsigned char hdr, const unsigned char *data,
+ int size)
+{
+ return hidp_send_message(session, session->ctrl_sock,
+ &session->ctrl_transmit, hdr, data, size);
+}
+
+static int hidp_send_intr_message(struct hidp_session *session,
+ unsigned char hdr, const unsigned char *data,
+ int size)
+{
+ return hidp_send_message(session, session->intr_sock,
+ &session->intr_transmit, hdr, data, size);
+}
+
+static int hidp_input_event(struct input_dev *dev, unsigned int type,
+ unsigned int code, int value)
+{
+ struct hidp_session *session = input_get_drvdata(dev);
+ unsigned char newleds;
+ unsigned char hdr, data[2];
+
+ BT_DBG("session %p type %d code %d value %d",
+ session, type, code, value);
+
+ if (type != EV_LED)
+ return -1;
+
+ newleds = (!!test_bit(LED_KANA, dev->led) << 3) |
+ (!!test_bit(LED_COMPOSE, dev->led) << 3) |
+ (!!test_bit(LED_SCROLLL, dev->led) << 2) |
+ (!!test_bit(LED_CAPSL, dev->led) << 1) |
+ (!!test_bit(LED_NUML, dev->led) << 0);
+
+ if (session->leds == newleds)
+ return 0;
+
+ session->leds = newleds;
+
+ hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
+ data[0] = 0x01;
+ data[1] = newleds;
+
+ return hidp_send_intr_message(session, hdr, data, 2);
+}
+
+static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
+{
+ struct input_dev *dev = session->input;
+ unsigned char *keys = session->keys;
+ unsigned char *udata = skb->data + 1;
+ signed char *sdata = skb->data + 1;
+ int i, size = skb->len - 1;
+
+ switch (skb->data[0]) {
+ case 0x01: /* Keyboard report */
+ for (i = 0; i < 8; i++)
+ input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
+
+ /* If all the key codes have been set to 0x01, it means
+ * too many keys were pressed at the same time. */
+ if (!memcmp(udata + 2, hidp_mkeyspat, 6))
+ break;
+
+ for (i = 2; i < 8; i++) {
+ if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
+ if (hidp_keycode[keys[i]])
+ input_report_key(dev, hidp_keycode[keys[i]], 0);
+ else
+ BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
+ }
+
+ if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
+ if (hidp_keycode[udata[i]])
+ input_report_key(dev, hidp_keycode[udata[i]], 1);
+ else
+ BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
+ }
+ }
+
+ memcpy(keys, udata, 8);
+ break;
+
+ case 0x02: /* Mouse report */
+ input_report_key(dev, BTN_LEFT, sdata[0] & 0x01);
+ input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02);
+ input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
+ input_report_key(dev, BTN_SIDE, sdata[0] & 0x08);
+ input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10);
+
+ input_report_rel(dev, REL_X, sdata[1]);
+ input_report_rel(dev, REL_Y, sdata[2]);
+
+ if (size > 3)
+ input_report_rel(dev, REL_WHEEL, sdata[3]);
+ break;
+ }
+
+ input_sync(dev);
+}
+
+static int hidp_get_raw_report(struct hid_device *hid,
+ unsigned char report_number,
+ unsigned char *data, size_t count,
+ unsigned char report_type)
+{
+ struct hidp_session *session = hid->driver_data;
+ struct sk_buff *skb;
+ size_t len;
+ int numbered_reports = hid->report_enum[report_type].numbered;
+ int ret;
+
+ if (atomic_read(&session->terminate))
+ return -EIO;
+
+ switch (report_type) {
+ case HID_FEATURE_REPORT:
+ report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
+ break;
+ case HID_INPUT_REPORT:
+ report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
+ break;
+ case HID_OUTPUT_REPORT:
+ report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (mutex_lock_interruptible(&session->report_mutex))
+ return -ERESTARTSYS;
+
+ /* Set up our wait, and send the report request to the device. */
+ session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
+ session->waiting_report_number = numbered_reports ? report_number : -1;
+ set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
+ data[0] = report_number;
+ ret = hidp_send_ctrl_message(session, report_type, data, 1);
+ if (ret < 0)
+ goto err;
+
+ /* Wait for the return of the report. The returned report
+ gets put in session->report_return. */
+ while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
+ !atomic_read(&session->terminate)) {
+ int res;
+
+ res = wait_event_interruptible_timeout(session->report_queue,
+ !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)
+ || atomic_read(&session->terminate),
+ 5*HZ);
+ if (res == 0) {
+ /* timeout */
+ ret = -EIO;
+ goto err;
+ }
+ if (res < 0) {
+ /* signal */
+ ret = -ERESTARTSYS;
+ goto err;
+ }
+ }
+
+ skb = session->report_return;
+ if (skb) {
+ len = skb->len < count ? skb->len : count;
+ memcpy(data, skb->data, len);
+
+ kfree_skb(skb);
+ session->report_return = NULL;
+ } else {
+ /* Device returned a HANDSHAKE, indicating protocol error. */
+ len = -EIO;
+ }
+
+ clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
+ mutex_unlock(&session->report_mutex);
+
+ return len;
+
+err:
+ clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
+ mutex_unlock(&session->report_mutex);
+ return ret;
+}
+
+static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum,
+ unsigned char *data, size_t count,
+ unsigned char report_type)
+{
+ struct hidp_session *session = hid->driver_data;
+ int ret;
+
+ switch (report_type) {
+ case HID_FEATURE_REPORT:
+ report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
+ break;
+ case HID_INPUT_REPORT:
+ report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT;
+ break;
+ case HID_OUTPUT_REPORT:
+ report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (mutex_lock_interruptible(&session->report_mutex))
+ return -ERESTARTSYS;
+
+ /* Set up our wait, and send the report request to the device. */
+ data[0] = reportnum;
+ set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
+ ret = hidp_send_ctrl_message(session, report_type, data, count);
+ if (ret < 0)
+ goto err;
+
+ /* Wait for the ACK from the device. */
+ while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) &&
+ !atomic_read(&session->terminate)) {
+ int res;
+
+ res = wait_event_interruptible_timeout(session->report_queue,
+ !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)
+ || atomic_read(&session->terminate),
+ 10*HZ);
+ if (res == 0) {
+ /* timeout */
+ ret = -EIO;
+ goto err;
+ }
+ if (res < 0) {
+ /* signal */
+ ret = -ERESTARTSYS;
+ goto err;
+ }
+ }
+
+ if (!session->output_report_success) {
+ ret = -EIO;
+ goto err;
+ }
+
+ ret = count;
+
+err:
+ clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
+ mutex_unlock(&session->report_mutex);
+ return ret;
+}
+
+static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count)
+{
+ struct hidp_session *session = hid->driver_data;
+
+ return hidp_send_intr_message(session,
+ HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT,
+ data, count);
+}
+
+static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum,
+ __u8 *buf, size_t len, unsigned char rtype,
+ int reqtype)
+{
+ switch (reqtype) {
+ case HID_REQ_GET_REPORT:
+ return hidp_get_raw_report(hid, reportnum, buf, len, rtype);
+ case HID_REQ_SET_REPORT:
+ return hidp_set_raw_report(hid, reportnum, buf, len, rtype);
+ default:
+ return -EIO;
+ }
+}
+
+static void hidp_idle_timeout(struct timer_list *t)
+{
+ struct hidp_session *session = from_timer(session, t, timer);
+
+ /* The HIDP user-space API only contains calls to add and remove
+ * devices. There is no way to forward events of any kind. Therefore,
+ * we have to forcefully disconnect a device on idle-timeouts. This is
+ * unfortunate and weird API design, but it is spec-compliant and
+ * required for backwards-compatibility. Hence, on idle-timeout, we
+ * signal driver-detach events, so poll() will be woken up with an
+ * error-condition on both sockets.
+ */
+
+ session->intr_sock->sk->sk_err = EUNATCH;
+ session->ctrl_sock->sk->sk_err = EUNATCH;
+ wake_up_interruptible(sk_sleep(session->intr_sock->sk));
+ wake_up_interruptible(sk_sleep(session->ctrl_sock->sk));
+
+ hidp_session_terminate(session);
+}
+
+static void hidp_set_timer(struct hidp_session *session)
+{
+ if (session->idle_to > 0)
+ mod_timer(&session->timer, jiffies + HZ * session->idle_to);
+}
+
+static void hidp_del_timer(struct hidp_session *session)
+{
+ if (session->idle_to > 0)
+ del_timer_sync(&session->timer);
+}
+
+static void hidp_process_report(struct hidp_session *session, int type,
+ const u8 *data, unsigned int len, int intr)
+{
+ if (len > HID_MAX_BUFFER_SIZE)
+ len = HID_MAX_BUFFER_SIZE;
+
+ memcpy(session->input_buf, data, len);
+ hid_input_report(session->hid, type, session->input_buf, len, intr);
+}
+
+static void hidp_process_handshake(struct hidp_session *session,
+ unsigned char param)
+{
+ BT_DBG("session %p param 0x%02x", session, param);
+ session->output_report_success = 0; /* default condition */
+
+ switch (param) {
+ case HIDP_HSHK_SUCCESSFUL:
+ /* FIXME: Call into SET_ GET_ handlers here */
+ session->output_report_success = 1;
+ break;
+
+ case HIDP_HSHK_NOT_READY:
+ case HIDP_HSHK_ERR_INVALID_REPORT_ID:
+ case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
+ case HIDP_HSHK_ERR_INVALID_PARAMETER:
+ if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags))
+ wake_up_interruptible(&session->report_queue);
+
+ /* FIXME: Call into SET_ GET_ handlers here */
+ break;
+
+ case HIDP_HSHK_ERR_UNKNOWN:
+ break;
+
+ case HIDP_HSHK_ERR_FATAL:
+ /* Device requests a reboot, as this is the only way this error
+ * can be recovered. */
+ hidp_send_ctrl_message(session,
+ HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
+ break;
+
+ default:
+ hidp_send_ctrl_message(session,
+ HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
+ break;
+ }
+
+ /* Wake up the waiting thread. */
+ if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags))
+ wake_up_interruptible(&session->report_queue);
+}
+
+static void hidp_process_hid_control(struct hidp_session *session,
+ unsigned char param)
+{
+ BT_DBG("session %p param 0x%02x", session, param);
+
+ if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
+ /* Flush the transmit queues */
+ skb_queue_purge(&session->ctrl_transmit);
+ skb_queue_purge(&session->intr_transmit);
+
+ hidp_session_terminate(session);
+ }
+}
+
+/* Returns true if the passed-in skb should be freed by the caller. */
+static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
+ unsigned char param)
+{
+ int done_with_skb = 1;
+ BT_DBG("session %p skb %p len %u param 0x%02x", session, skb, skb->len, param);
+
+ switch (param) {
+ case HIDP_DATA_RTYPE_INPUT:
+ hidp_set_timer(session);
+
+ if (session->input)
+ hidp_input_report(session, skb);
+
+ if (session->hid)
+ hidp_process_report(session, HID_INPUT_REPORT,
+ skb->data, skb->len, 0);
+ break;
+
+ case HIDP_DATA_RTYPE_OTHER:
+ case HIDP_DATA_RTYPE_OUPUT:
+ case HIDP_DATA_RTYPE_FEATURE:
+ break;
+
+ default:
+ hidp_send_ctrl_message(session,
+ HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
+ }
+
+ if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
+ param == session->waiting_report_type) {
+ if (session->waiting_report_number < 0 ||
+ session->waiting_report_number == skb->data[0]) {
+ /* hidp_get_raw_report() is waiting on this report. */
+ session->report_return = skb;
+ done_with_skb = 0;
+ clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
+ wake_up_interruptible(&session->report_queue);
+ }
+ }
+
+ return done_with_skb;
+}
+
+static void hidp_recv_ctrl_frame(struct hidp_session *session,
+ struct sk_buff *skb)
+{
+ unsigned char hdr, type, param;
+ int free_skb = 1;
+
+ BT_DBG("session %p skb %p len %u", session, skb, skb->len);
+
+ hdr = skb->data[0];
+ skb_pull(skb, 1);
+
+ type = hdr & HIDP_HEADER_TRANS_MASK;
+ param = hdr & HIDP_HEADER_PARAM_MASK;
+
+ switch (type) {
+ case HIDP_TRANS_HANDSHAKE:
+ hidp_process_handshake(session, param);
+ break;
+
+ case HIDP_TRANS_HID_CONTROL:
+ hidp_process_hid_control(session, param);
+ break;
+
+ case HIDP_TRANS_DATA:
+ free_skb = hidp_process_data(session, skb, param);
+ break;
+
+ default:
+ hidp_send_ctrl_message(session,
+ HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
+ break;
+ }
+
+ if (free_skb)
+ kfree_skb(skb);
+}
+
+static void hidp_recv_intr_frame(struct hidp_session *session,
+ struct sk_buff *skb)
+{
+ unsigned char hdr;
+
+ BT_DBG("session %p skb %p len %u", session, skb, skb->len);
+
+ hdr = skb->data[0];
+ skb_pull(skb, 1);
+
+ if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
+ hidp_set_timer(session);
+
+ if (session->input)
+ hidp_input_report(session, skb);
+
+ if (session->hid) {
+ hidp_process_report(session, HID_INPUT_REPORT,
+ skb->data, skb->len, 1);
+ BT_DBG("report len %d", skb->len);
+ }
+ } else {
+ BT_DBG("Unsupported protocol header 0x%02x", hdr);
+ }
+
+ kfree_skb(skb);
+}
+
+static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
+{
+ struct kvec iv = { data, len };
+ struct msghdr msg;
+
+ BT_DBG("sock %p data %p len %d", sock, data, len);
+
+ if (!len)
+ return 0;
+
+ memset(&msg, 0, sizeof(msg));
+
+ return kernel_sendmsg(sock, &msg, &iv, 1, len);
+}
+
+/* dequeue message from @transmit and send via @sock */
+static void hidp_process_transmit(struct hidp_session *session,
+ struct sk_buff_head *transmit,
+ struct socket *sock)
+{
+ struct sk_buff *skb;
+ int ret;
+
+ BT_DBG("session %p", session);
+
+ while ((skb = skb_dequeue(transmit))) {
+ ret = hidp_send_frame(sock, skb->data, skb->len);
+ if (ret == -EAGAIN) {
+ skb_queue_head(transmit, skb);
+ break;
+ } else if (ret < 0) {
+ hidp_session_terminate(session);
+ kfree_skb(skb);
+ break;
+ }
+
+ hidp_set_timer(session);
+ kfree_skb(skb);
+ }
+}
+
+static int hidp_setup_input(struct hidp_session *session,
+ const struct hidp_connadd_req *req)
+{
+ struct input_dev *input;
+ int i;
+
+ input = input_allocate_device();
+ if (!input)
+ return -ENOMEM;
+
+ session->input = input;
+
+ input_set_drvdata(input, session);
+
+ input->name = "Bluetooth HID Boot Protocol Device";
+
+ input->id.bustype = BUS_BLUETOOTH;
+ input->id.vendor = req->vendor;
+ input->id.product = req->product;
+ input->id.version = req->version;
+
+ if (req->subclass & 0x40) {
+ set_bit(EV_KEY, input->evbit);
+ set_bit(EV_LED, input->evbit);
+ set_bit(EV_REP, input->evbit);
+
+ set_bit(LED_NUML, input->ledbit);
+ set_bit(LED_CAPSL, input->ledbit);
+ set_bit(LED_SCROLLL, input->ledbit);
+ set_bit(LED_COMPOSE, input->ledbit);
+ set_bit(LED_KANA, input->ledbit);
+
+ for (i = 0; i < sizeof(hidp_keycode); i++)
+ set_bit(hidp_keycode[i], input->keybit);
+ clear_bit(0, input->keybit);
+ }
+
+ if (req->subclass & 0x80) {
+ input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
+ input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
+ BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
+ input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
+ input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
+ BIT_MASK(BTN_EXTRA);
+ input->relbit[0] |= BIT_MASK(REL_WHEEL);
+ }
+
+ input->dev.parent = &session->conn->hcon->dev;
+
+ input->event = hidp_input_event;
+
+ return 0;
+}
+
+static int hidp_open(struct hid_device *hid)
+{
+ return 0;
+}
+
+static void hidp_close(struct hid_device *hid)
+{
+}
+
+static int hidp_parse(struct hid_device *hid)
+{
+ struct hidp_session *session = hid->driver_data;
+
+ return hid_parse_report(session->hid, session->rd_data,
+ session->rd_size);
+}
+
+static int hidp_start(struct hid_device *hid)
+{
+ return 0;
+}
+
+static void hidp_stop(struct hid_device *hid)
+{
+ struct hidp_session *session = hid->driver_data;
+
+ skb_queue_purge(&session->ctrl_transmit);
+ skb_queue_purge(&session->intr_transmit);
+
+ hid->claimed = 0;
+}
+
+static const struct hid_ll_driver hidp_hid_driver = {
+ .parse = hidp_parse,
+ .start = hidp_start,
+ .stop = hidp_stop,
+ .open = hidp_open,
+ .close = hidp_close,
+ .raw_request = hidp_raw_request,
+ .output_report = hidp_output_report,
+};
+
+/* This function sets up the hid device. It does not add it
+ to the HID system. That is done in hidp_add_connection(). */
+static int hidp_setup_hid(struct hidp_session *session,
+ const struct hidp_connadd_req *req)
+{
+ struct hid_device *hid;
+ int err;
+
+ session->rd_data = memdup_user(req->rd_data, req->rd_size);
+ if (IS_ERR(session->rd_data))
+ return PTR_ERR(session->rd_data);
+
+ session->rd_size = req->rd_size;
+
+ hid = hid_allocate_device();
+ if (IS_ERR(hid)) {
+ err = PTR_ERR(hid);
+ goto fault;
+ }
+
+ session->hid = hid;
+
+ hid->driver_data = session;
+
+ hid->bus = BUS_BLUETOOTH;
+ hid->vendor = req->vendor;
+ hid->product = req->product;
+ hid->version = req->version;
+ hid->country = req->country;
+
+ strscpy(hid->name, req->name, sizeof(hid->name));
+
+ snprintf(hid->phys, sizeof(hid->phys), "%pMR",
+ &l2cap_pi(session->ctrl_sock->sk)->chan->src);
+
+ /* NOTE: Some device modules depend on the dst address being stored in
+ * uniq. Please be aware of this before making changes to this behavior.
+ */
+ snprintf(hid->uniq, sizeof(hid->uniq), "%pMR",
+ &l2cap_pi(session->ctrl_sock->sk)->chan->dst);
+
+ hid->dev.parent = &session->conn->hcon->dev;
+ hid->ll_driver = &hidp_hid_driver;
+
+ /* True if device is blocked in drivers/hid/hid-quirks.c */
+ if (hid_ignore(hid)) {
+ hid_destroy_device(session->hid);
+ session->hid = NULL;
+ return -ENODEV;
+ }
+
+ return 0;
+
+fault:
+ kfree(session->rd_data);
+ session->rd_data = NULL;
+
+ return err;
+}
+
+/* initialize session devices */
+static int hidp_session_dev_init(struct hidp_session *session,
+ const struct hidp_connadd_req *req)
+{
+ int ret;
+
+ if (req->rd_size > 0) {
+ ret = hidp_setup_hid(session, req);
+ if (ret && ret != -ENODEV)
+ return ret;
+ }
+
+ if (!session->hid) {
+ ret = hidp_setup_input(session, req);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+/* destroy session devices */
+static void hidp_session_dev_destroy(struct hidp_session *session)
+{
+ if (session->hid)
+ put_device(&session->hid->dev);
+ else if (session->input)
+ input_put_device(session->input);
+
+ kfree(session->rd_data);
+ session->rd_data = NULL;
+}
+
+/* add HID/input devices to their underlying bus systems */
+static int hidp_session_dev_add(struct hidp_session *session)
+{
+ int ret;
+
+ /* Both HID and input systems drop a ref-count when unregistering the
+ * device but they don't take a ref-count when registering them. Work
+ * around this by explicitly taking a refcount during registration
+ * which is dropped automatically by unregistering the devices. */
+
+ if (session->hid) {
+ ret = hid_add_device(session->hid);
+ if (ret)
+ return ret;
+ get_device(&session->hid->dev);
+ } else if (session->input) {
+ ret = input_register_device(session->input);
+ if (ret)
+ return ret;
+ input_get_device(session->input);
+ }
+
+ return 0;
+}
+
+/* remove HID/input devices from their bus systems */
+static void hidp_session_dev_del(struct hidp_session *session)
+{
+ if (session->hid)
+ hid_destroy_device(session->hid);
+ else if (session->input)
+ input_unregister_device(session->input);
+}
+
+/*
+ * Asynchronous device registration
+ * HID device drivers might want to perform I/O during initialization to
+ * detect device types. Therefore, call device registration in a separate
+ * worker so the HIDP thread can schedule I/O operations.
+ * Note that this must be called after the worker thread was initialized
+ * successfully. This will then add the devices and increase session state
+ * on success, otherwise it will terminate the session thread.
+ */
+static void hidp_session_dev_work(struct work_struct *work)
+{
+ struct hidp_session *session = container_of(work,
+ struct hidp_session,
+ dev_init);
+ int ret;
+
+ ret = hidp_session_dev_add(session);
+ if (!ret)
+ atomic_inc(&session->state);
+ else
+ hidp_session_terminate(session);
+}
+
+/*
+ * Create new session object
+ * Allocate session object, initialize static fields, copy input data into the
+ * object and take a reference to all sub-objects.
+ * This returns 0 on success and puts a pointer to the new session object in
+ * \out. Otherwise, an error code is returned.
+ * The new session object has an initial ref-count of 1.
+ */
+static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
+ struct socket *ctrl_sock,
+ struct socket *intr_sock,
+ const struct hidp_connadd_req *req,
+ struct l2cap_conn *conn)
+{
+ struct hidp_session *session;
+ int ret;
+ struct bt_sock *ctrl, *intr;
+
+ ctrl = bt_sk(ctrl_sock->sk);
+ intr = bt_sk(intr_sock->sk);
+
+ session = kzalloc(sizeof(*session), GFP_KERNEL);
+ if (!session)
+ return -ENOMEM;
+
+ /* object and runtime management */
+ kref_init(&session->ref);
+ atomic_set(&session->state, HIDP_SESSION_IDLING);
+ init_waitqueue_head(&session->state_queue);
+ session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID);
+
+ /* connection management */
+ bacpy(&session->bdaddr, bdaddr);
+ session->conn = l2cap_conn_get(conn);
+ session->user.probe = hidp_session_probe;
+ session->user.remove = hidp_session_remove;
+ INIT_LIST_HEAD(&session->user.list);
+ session->ctrl_sock = ctrl_sock;
+ session->intr_sock = intr_sock;
+ skb_queue_head_init(&session->ctrl_transmit);
+ skb_queue_head_init(&session->intr_transmit);
+ session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu,
+ l2cap_pi(ctrl)->chan->imtu);
+ session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu,
+ l2cap_pi(intr)->chan->imtu);
+ session->idle_to = req->idle_to;
+
+ /* device management */
+ INIT_WORK(&session->dev_init, hidp_session_dev_work);
+ timer_setup(&session->timer, hidp_idle_timeout, 0);
+
+ /* session data */
+ mutex_init(&session->report_mutex);
+ init_waitqueue_head(&session->report_queue);
+
+ ret = hidp_session_dev_init(session, req);
+ if (ret)
+ goto err_free;
+
+ get_file(session->intr_sock->file);
+ get_file(session->ctrl_sock->file);
+ *out = session;
+ return 0;
+
+err_free:
+ l2cap_conn_put(session->conn);
+ kfree(session);
+ return ret;
+}
+
+/* increase ref-count of the given session by one */
+static void hidp_session_get(struct hidp_session *session)
+{
+ kref_get(&session->ref);
+}
+
+/* release callback */
+static void session_free(struct kref *ref)
+{
+ struct hidp_session *session = container_of(ref, struct hidp_session,
+ ref);
+
+ hidp_session_dev_destroy(session);
+ skb_queue_purge(&session->ctrl_transmit);
+ skb_queue_purge(&session->intr_transmit);
+ fput(session->intr_sock->file);
+ fput(session->ctrl_sock->file);
+ l2cap_conn_put(session->conn);
+ kfree(session);
+}
+
+/* decrease ref-count of the given session by one */
+static void hidp_session_put(struct hidp_session *session)
+{
+ kref_put(&session->ref, session_free);
+}
+
+/*
+ * Search the list of active sessions for a session with target address
+ * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as
+ * you do not release this lock, the session objects cannot vanish and you can
+ * safely take a reference to the session yourself.
+ */
+static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr)
+{
+ struct hidp_session *session;
+
+ list_for_each_entry(session, &hidp_session_list, list) {
+ if (!bacmp(bdaddr, &session->bdaddr))
+ return session;
+ }
+
+ return NULL;
+}
+
+/*
+ * Same as __hidp_session_find() but no locks must be held. This also takes a
+ * reference of the returned session (if non-NULL) so you must drop this
+ * reference if you no longer use the object.
+ */
+static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr)
+{
+ struct hidp_session *session;
+
+ down_read(&hidp_session_sem);
+
+ session = __hidp_session_find(bdaddr);
+ if (session)
+ hidp_session_get(session);
+
+ up_read(&hidp_session_sem);
+
+ return session;
+}
+
+/*
+ * Start session synchronously
+ * This starts a session thread and waits until initialization
+ * is done or returns an error if it couldn't be started.
+ * If this returns 0 the session thread is up and running. You must call
+ * hipd_session_stop_sync() before deleting any runtime resources.
+ */
+static int hidp_session_start_sync(struct hidp_session *session)
+{
+ unsigned int vendor, product;
+
+ if (session->hid) {
+ vendor = session->hid->vendor;
+ product = session->hid->product;
+ } else if (session->input) {
+ vendor = session->input->id.vendor;
+ product = session->input->id.product;
+ } else {
+ vendor = 0x0000;
+ product = 0x0000;
+ }
+
+ session->task = kthread_run(hidp_session_thread, session,
+ "khidpd_%04x%04x", vendor, product);
+ if (IS_ERR(session->task))
+ return PTR_ERR(session->task);
+
+ while (atomic_read(&session->state) <= HIDP_SESSION_IDLING)
+ wait_event(session->state_queue,
+ atomic_read(&session->state) > HIDP_SESSION_IDLING);
+
+ return 0;
+}
+
+/*
+ * Terminate session thread
+ * Wake up session thread and notify it to stop. This is asynchronous and
+ * returns immediately. Call this whenever a runtime error occurs and you want
+ * the session to stop.
+ * Note: wake_up_interruptible() performs any necessary memory-barriers for us.
+ */
+static void hidp_session_terminate(struct hidp_session *session)
+{
+ atomic_inc(&session->terminate);
+ /*
+ * See the comment preceding the call to wait_woken()
+ * in hidp_session_run().
+ */
+ wake_up_interruptible(&hidp_session_wq);
+}
+
+/*
+ * Probe HIDP session
+ * This is called from the l2cap_conn core when our l2cap_user object is bound
+ * to the hci-connection. We get the session via the \user object and can now
+ * start the session thread, link it into the global session list and
+ * schedule HID/input device registration.
+ * The global session-list owns its own reference to the session object so you
+ * can drop your own reference after registering the l2cap_user object.
+ */
+static int hidp_session_probe(struct l2cap_conn *conn,
+ struct l2cap_user *user)
+{
+ struct hidp_session *session = container_of(user,
+ struct hidp_session,
+ user);
+ struct hidp_session *s;
+ int ret;
+
+ down_write(&hidp_session_sem);
+
+ /* check that no other session for this device exists */
+ s = __hidp_session_find(&session->bdaddr);
+ if (s) {
+ ret = -EEXIST;
+ goto out_unlock;
+ }
+
+ if (session->input) {
+ ret = hidp_session_dev_add(session);
+ if (ret)
+ goto out_unlock;
+ }
+
+ ret = hidp_session_start_sync(session);
+ if (ret)
+ goto out_del;
+
+ /* HID device registration is async to allow I/O during probe */
+ if (session->input)
+ atomic_inc(&session->state);
+ else
+ schedule_work(&session->dev_init);
+
+ hidp_session_get(session);
+ list_add(&session->list, &hidp_session_list);
+ ret = 0;
+ goto out_unlock;
+
+out_del:
+ if (session->input)
+ hidp_session_dev_del(session);
+out_unlock:
+ up_write(&hidp_session_sem);
+ return ret;
+}
+
+/*
+ * Remove HIDP session
+ * Called from the l2cap_conn core when either we explicitly unregistered
+ * the l2cap_user object or if the underlying connection is shut down.
+ * We signal the hidp-session thread to shut down, unregister the HID/input
+ * devices and unlink the session from the global list.
+ * This drops the reference to the session that is owned by the global
+ * session-list.
+ * Note: We _must_ not synchronosly wait for the session-thread to shut down.
+ * This is, because the session-thread might be waiting for an HCI lock that is
+ * held while we are called. Therefore, we only unregister the devices and
+ * notify the session-thread to terminate. The thread itself owns a reference
+ * to the session object so it can safely shut down.
+ */
+static void hidp_session_remove(struct l2cap_conn *conn,
+ struct l2cap_user *user)
+{
+ struct hidp_session *session = container_of(user,
+ struct hidp_session,
+ user);
+
+ down_write(&hidp_session_sem);
+
+ hidp_session_terminate(session);
+
+ cancel_work_sync(&session->dev_init);
+ if (session->input ||
+ atomic_read(&session->state) > HIDP_SESSION_PREPARING)
+ hidp_session_dev_del(session);
+
+ list_del(&session->list);
+
+ up_write(&hidp_session_sem);
+
+ hidp_session_put(session);
+}
+
+/*
+ * Session Worker
+ * This performs the actual main-loop of the HIDP worker. We first check
+ * whether the underlying connection is still alive, then parse all pending
+ * messages and finally send all outstanding messages.
+ */
+static void hidp_session_run(struct hidp_session *session)
+{
+ struct sock *ctrl_sk = session->ctrl_sock->sk;
+ struct sock *intr_sk = session->intr_sock->sk;
+ struct sk_buff *skb;
+ DEFINE_WAIT_FUNC(wait, woken_wake_function);
+
+ add_wait_queue(&hidp_session_wq, &wait);
+ for (;;) {
+ /*
+ * This thread can be woken up two ways:
+ * - You call hidp_session_terminate() which sets the
+ * session->terminate flag and wakes this thread up.
+ * - Via modifying the socket state of ctrl/intr_sock. This
+ * thread is woken up by ->sk_state_changed().
+ */
+
+ if (atomic_read(&session->terminate))
+ break;
+
+ if (ctrl_sk->sk_state != BT_CONNECTED ||
+ intr_sk->sk_state != BT_CONNECTED)
+ break;
+
+ /* parse incoming intr-skbs */
+ while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
+ skb_orphan(skb);
+ if (!skb_linearize(skb))
+ hidp_recv_intr_frame(session, skb);
+ else
+ kfree_skb(skb);
+ }
+
+ /* send pending intr-skbs */
+ hidp_process_transmit(session, &session->intr_transmit,
+ session->intr_sock);
+
+ /* parse incoming ctrl-skbs */
+ while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
+ skb_orphan(skb);
+ if (!skb_linearize(skb))
+ hidp_recv_ctrl_frame(session, skb);
+ else
+ kfree_skb(skb);
+ }
+
+ /* send pending ctrl-skbs */
+ hidp_process_transmit(session, &session->ctrl_transmit,
+ session->ctrl_sock);
+
+ /*
+ * wait_woken() performs the necessary memory barriers
+ * for us; see the header comment for this primitive.
+ */
+ wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
+ }
+ remove_wait_queue(&hidp_session_wq, &wait);
+
+ atomic_inc(&session->terminate);
+}
+
+static int hidp_session_wake_function(wait_queue_entry_t *wait,
+ unsigned int mode,
+ int sync, void *key)
+{
+ wake_up_interruptible(&hidp_session_wq);
+ return false;
+}
+
+/*
+ * HIDP session thread
+ * This thread runs the I/O for a single HIDP session. Startup is synchronous
+ * which allows us to take references to ourself here instead of doing that in
+ * the caller.
+ * When we are ready to run we notify the caller and call hidp_session_run().
+ */
+static int hidp_session_thread(void *arg)
+{
+ struct hidp_session *session = arg;
+ DEFINE_WAIT_FUNC(ctrl_wait, hidp_session_wake_function);
+ DEFINE_WAIT_FUNC(intr_wait, hidp_session_wake_function);
+
+ BT_DBG("session %p", session);
+
+ /* initialize runtime environment */
+ hidp_session_get(session);
+ __module_get(THIS_MODULE);
+ set_user_nice(current, -15);
+ hidp_set_timer(session);
+
+ add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
+ add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
+ /* This memory barrier is paired with wq_has_sleeper(). See
+ * sock_poll_wait() for more information why this is needed. */
+ smp_mb__before_atomic();
+
+ /* notify synchronous startup that we're ready */
+ atomic_inc(&session->state);
+ wake_up(&session->state_queue);
+
+ /* run session */
+ hidp_session_run(session);
+
+ /* cleanup runtime environment */
+ remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
+ remove_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
+ wake_up_interruptible(&session->report_queue);
+ hidp_del_timer(session);
+
+ /*
+ * If we stopped ourself due to any internal signal, we should try to
+ * unregister our own session here to avoid having it linger until the
+ * parent l2cap_conn dies or user-space cleans it up.
+ * This does not deadlock as we don't do any synchronous shutdown.
+ * Instead, this call has the same semantics as if user-space tried to
+ * delete the session.
+ */
+ l2cap_unregister_user(session->conn, &session->user);
+ hidp_session_put(session);
+
+ module_put_and_kthread_exit(0);
+ return 0;
+}
+
+static int hidp_verify_sockets(struct socket *ctrl_sock,
+ struct socket *intr_sock)
+{
+ struct l2cap_chan *ctrl_chan, *intr_chan;
+ struct bt_sock *ctrl, *intr;
+ struct hidp_session *session;
+
+ if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock))
+ return -EINVAL;
+
+ ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan;
+ intr_chan = l2cap_pi(intr_sock->sk)->chan;
+
+ if (bacmp(&ctrl_chan->src, &intr_chan->src) ||
+ bacmp(&ctrl_chan->dst, &intr_chan->dst))
+ return -ENOTUNIQ;
+
+ ctrl = bt_sk(ctrl_sock->sk);
+ intr = bt_sk(intr_sock->sk);
+
+ if (ctrl->sk.sk_state != BT_CONNECTED ||
+ intr->sk.sk_state != BT_CONNECTED)
+ return -EBADFD;
+
+ /* early session check, we check again during session registration */
+ session = hidp_session_find(&ctrl_chan->dst);
+ if (session) {
+ hidp_session_put(session);
+ return -EEXIST;
+ }
+
+ return 0;
+}
+
+int hidp_connection_add(const struct hidp_connadd_req *req,
+ struct socket *ctrl_sock,
+ struct socket *intr_sock)
+{
+ u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) |
+ BIT(HIDP_BOOT_PROTOCOL_MODE);
+ struct hidp_session *session;
+ struct l2cap_conn *conn;
+ struct l2cap_chan *chan;
+ int ret;
+
+ ret = hidp_verify_sockets(ctrl_sock, intr_sock);
+ if (ret)
+ return ret;
+
+ if (req->flags & ~valid_flags)
+ return -EINVAL;
+
+ chan = l2cap_pi(ctrl_sock->sk)->chan;
+ conn = NULL;
+ l2cap_chan_lock(chan);
+ if (chan->conn)
+ conn = l2cap_conn_get(chan->conn);
+ l2cap_chan_unlock(chan);
+
+ if (!conn)
+ return -EBADFD;
+
+ ret = hidp_session_new(&session, &chan->dst, ctrl_sock,
+ intr_sock, req, conn);
+ if (ret)
+ goto out_conn;
+
+ ret = l2cap_register_user(conn, &session->user);
+ if (ret)
+ goto out_session;
+
+ ret = 0;
+
+out_session:
+ hidp_session_put(session);
+out_conn:
+ l2cap_conn_put(conn);
+ return ret;
+}
+
+int hidp_connection_del(struct hidp_conndel_req *req)
+{
+ u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG);
+ struct hidp_session *session;
+
+ if (req->flags & ~valid_flags)
+ return -EINVAL;
+
+ session = hidp_session_find(&req->bdaddr);
+ if (!session)
+ return -ENOENT;
+
+ if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG))
+ hidp_send_ctrl_message(session,
+ HIDP_TRANS_HID_CONTROL |
+ HIDP_CTRL_VIRTUAL_CABLE_UNPLUG,
+ NULL, 0);
+ else
+ l2cap_unregister_user(session->conn, &session->user);
+
+ hidp_session_put(session);
+
+ return 0;
+}
+
+int hidp_get_connlist(struct hidp_connlist_req *req)
+{
+ struct hidp_session *session;
+ int err = 0, n = 0;
+
+ BT_DBG("");
+
+ down_read(&hidp_session_sem);
+
+ list_for_each_entry(session, &hidp_session_list, list) {
+ struct hidp_conninfo ci;
+
+ hidp_copy_session(session, &ci);
+
+ if (copy_to_user(req->ci, &ci, sizeof(ci))) {
+ err = -EFAULT;
+ break;
+ }
+
+ if (++n >= req->cnum)
+ break;
+
+ req->ci++;
+ }
+ req->cnum = n;
+
+ up_read(&hidp_session_sem);
+ return err;
+}
+
+int hidp_get_conninfo(struct hidp_conninfo *ci)
+{
+ struct hidp_session *session;
+
+ session = hidp_session_find(&ci->bdaddr);
+ if (session) {
+ hidp_copy_session(session, ci);
+ hidp_session_put(session);
+ }
+
+ return session ? 0 : -ENOENT;
+}
+
+static int __init hidp_init(void)
+{
+ BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
+
+ return hidp_init_sockets();
+}
+
+static void __exit hidp_exit(void)
+{
+ hidp_cleanup_sockets();
+}
+
+module_init(hidp_init);
+module_exit(hidp_exit);
+
+MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
+MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
+MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("bt-proto-6");
diff --git a/net/bluetooth/hidp/hidp.h b/net/bluetooth/hidp/hidp.h
new file mode 100644
index 0000000000..6ef88d0a19
--- /dev/null
+++ b/net/bluetooth/hidp/hidp.h
@@ -0,0 +1,192 @@
+/*
+ HIDP implementation for Linux Bluetooth stack (BlueZ).
+ Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License version 2 as
+ published by the Free Software Foundation;
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+ IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
+ CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
+ COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
+ SOFTWARE IS DISCLAIMED.
+*/
+
+#ifndef __HIDP_H
+#define __HIDP_H
+
+#include <linux/types.h>
+#include <linux/hid.h>
+#include <linux/kref.h>
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/l2cap.h>
+
+/* HIDP header masks */
+#define HIDP_HEADER_TRANS_MASK 0xf0
+#define HIDP_HEADER_PARAM_MASK 0x0f
+
+/* HIDP transaction types */
+#define HIDP_TRANS_HANDSHAKE 0x00
+#define HIDP_TRANS_HID_CONTROL 0x10
+#define HIDP_TRANS_GET_REPORT 0x40
+#define HIDP_TRANS_SET_REPORT 0x50
+#define HIDP_TRANS_GET_PROTOCOL 0x60
+#define HIDP_TRANS_SET_PROTOCOL 0x70
+#define HIDP_TRANS_GET_IDLE 0x80
+#define HIDP_TRANS_SET_IDLE 0x90
+#define HIDP_TRANS_DATA 0xa0
+#define HIDP_TRANS_DATC 0xb0
+
+/* HIDP handshake results */
+#define HIDP_HSHK_SUCCESSFUL 0x00
+#define HIDP_HSHK_NOT_READY 0x01
+#define HIDP_HSHK_ERR_INVALID_REPORT_ID 0x02
+#define HIDP_HSHK_ERR_UNSUPPORTED_REQUEST 0x03
+#define HIDP_HSHK_ERR_INVALID_PARAMETER 0x04
+#define HIDP_HSHK_ERR_UNKNOWN 0x0e
+#define HIDP_HSHK_ERR_FATAL 0x0f
+
+/* HIDP control operation parameters */
+#define HIDP_CTRL_NOP 0x00
+#define HIDP_CTRL_HARD_RESET 0x01
+#define HIDP_CTRL_SOFT_RESET 0x02
+#define HIDP_CTRL_SUSPEND 0x03
+#define HIDP_CTRL_EXIT_SUSPEND 0x04
+#define HIDP_CTRL_VIRTUAL_CABLE_UNPLUG 0x05
+
+/* HIDP data transaction headers */
+#define HIDP_DATA_RTYPE_MASK 0x03
+#define HIDP_DATA_RSRVD_MASK 0x0c
+#define HIDP_DATA_RTYPE_OTHER 0x00
+#define HIDP_DATA_RTYPE_INPUT 0x01
+#define HIDP_DATA_RTYPE_OUPUT 0x02
+#define HIDP_DATA_RTYPE_FEATURE 0x03
+
+/* HIDP protocol header parameters */
+#define HIDP_PROTO_BOOT 0x00
+#define HIDP_PROTO_REPORT 0x01
+
+/* HIDP ioctl defines */
+#define HIDPCONNADD _IOW('H', 200, int)
+#define HIDPCONNDEL _IOW('H', 201, int)
+#define HIDPGETCONNLIST _IOR('H', 210, int)
+#define HIDPGETCONNINFO _IOR('H', 211, int)
+
+#define HIDP_VIRTUAL_CABLE_UNPLUG 0
+#define HIDP_BOOT_PROTOCOL_MODE 1
+#define HIDP_BLUETOOTH_VENDOR_ID 9
+#define HIDP_WAITING_FOR_RETURN 10
+#define HIDP_WAITING_FOR_SEND_ACK 11
+
+struct hidp_connadd_req {
+ int ctrl_sock; /* Connected control socket */
+ int intr_sock; /* Connected interrupt socket */
+ __u16 parser;
+ __u16 rd_size;
+ __u8 __user *rd_data;
+ __u8 country;
+ __u8 subclass;
+ __u16 vendor;
+ __u16 product;
+ __u16 version;
+ __u32 flags;
+ __u32 idle_to;
+ char name[128];
+};
+
+struct hidp_conndel_req {
+ bdaddr_t bdaddr;
+ __u32 flags;
+};
+
+struct hidp_conninfo {
+ bdaddr_t bdaddr;
+ __u32 flags;
+ __u16 state;
+ __u16 vendor;
+ __u16 product;
+ __u16 version;
+ char name[128];
+};
+
+struct hidp_connlist_req {
+ __u32 cnum;
+ struct hidp_conninfo __user *ci;
+};
+
+int hidp_connection_add(const struct hidp_connadd_req *req, struct socket *ctrl_sock, struct socket *intr_sock);
+int hidp_connection_del(struct hidp_conndel_req *req);
+int hidp_get_connlist(struct hidp_connlist_req *req);
+int hidp_get_conninfo(struct hidp_conninfo *ci);
+
+enum hidp_session_state {
+ HIDP_SESSION_IDLING,
+ HIDP_SESSION_PREPARING,
+ HIDP_SESSION_RUNNING,
+};
+
+/* HIDP session defines */
+struct hidp_session {
+ struct list_head list;
+ struct kref ref;
+
+ /* runtime management */
+ atomic_t state;
+ wait_queue_head_t state_queue;
+ atomic_t terminate;
+ struct task_struct *task;
+ unsigned long flags;
+
+ /* connection management */
+ bdaddr_t bdaddr;
+ struct l2cap_conn *conn;
+ struct l2cap_user user;
+ struct socket *ctrl_sock;
+ struct socket *intr_sock;
+ struct sk_buff_head ctrl_transmit;
+ struct sk_buff_head intr_transmit;
+ uint ctrl_mtu;
+ uint intr_mtu;
+ unsigned long idle_to;
+
+ /* device management */
+ struct work_struct dev_init;
+ struct input_dev *input;
+ struct hid_device *hid;
+ struct timer_list timer;
+
+ /* Report descriptor */
+ __u8 *rd_data;
+ uint rd_size;
+
+ /* session data */
+ unsigned char keys[8];
+ unsigned char leds;
+
+ /* Used in hidp_get_raw_report() */
+ int waiting_report_type; /* HIDP_DATA_RTYPE_* */
+ int waiting_report_number; /* -1 for not numbered */
+ struct mutex report_mutex;
+ struct sk_buff *report_return;
+ wait_queue_head_t report_queue;
+
+ /* Used in hidp_output_raw_report() */
+ int output_report_success; /* boolean */
+
+ /* temporary input buffer */
+ u8 input_buf[HID_MAX_BUFFER_SIZE];
+};
+
+/* HIDP init defines */
+int __init hidp_init_sockets(void);
+void __exit hidp_cleanup_sockets(void);
+
+#endif /* __HIDP_H */
diff --git a/net/bluetooth/hidp/sock.c b/net/bluetooth/hidp/sock.c
new file mode 100644
index 0000000000..c93aaeb3a3
--- /dev/null
+++ b/net/bluetooth/hidp/sock.c
@@ -0,0 +1,312 @@
+/*
+ HIDP implementation for Linux Bluetooth stack (BlueZ).
+ Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License version 2 as
+ published by the Free Software Foundation;
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+ IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
+ CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
+ COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
+ SOFTWARE IS DISCLAIMED.
+*/
+
+#include <linux/compat.h>
+#include <linux/export.h>
+#include <linux/file.h>
+
+#include "hidp.h"
+
+static struct bt_sock_list hidp_sk_list = {
+ .lock = __RW_LOCK_UNLOCKED(hidp_sk_list.lock)
+};
+
+static int hidp_sock_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ BT_DBG("sock %p sk %p", sock, sk);
+
+ if (!sk)
+ return 0;
+
+ bt_sock_unlink(&hidp_sk_list, sk);
+
+ sock_orphan(sk);
+ sock_put(sk);
+
+ return 0;
+}
+
+static int do_hidp_sock_ioctl(struct socket *sock, unsigned int cmd, void __user *argp)
+{
+ struct hidp_connadd_req ca;
+ struct hidp_conndel_req cd;
+ struct hidp_connlist_req cl;
+ struct hidp_conninfo ci;
+ struct socket *csock;
+ struct socket *isock;
+ int err;
+
+ BT_DBG("cmd %x arg %p", cmd, argp);
+
+ switch (cmd) {
+ case HIDPCONNADD:
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&ca, argp, sizeof(ca)))
+ return -EFAULT;
+
+ csock = sockfd_lookup(ca.ctrl_sock, &err);
+ if (!csock)
+ return err;
+
+ isock = sockfd_lookup(ca.intr_sock, &err);
+ if (!isock) {
+ sockfd_put(csock);
+ return err;
+ }
+ ca.name[sizeof(ca.name)-1] = 0;
+
+ err = hidp_connection_add(&ca, csock, isock);
+ if (!err && copy_to_user(argp, &ca, sizeof(ca)))
+ err = -EFAULT;
+
+ sockfd_put(csock);
+ sockfd_put(isock);
+
+ return err;
+
+ case HIDPCONNDEL:
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&cd, argp, sizeof(cd)))
+ return -EFAULT;
+
+ return hidp_connection_del(&cd);
+
+ case HIDPGETCONNLIST:
+ if (copy_from_user(&cl, argp, sizeof(cl)))
+ return -EFAULT;
+
+ if (cl.cnum <= 0)
+ return -EINVAL;
+
+ err = hidp_get_connlist(&cl);
+ if (!err && copy_to_user(argp, &cl, sizeof(cl)))
+ return -EFAULT;
+
+ return err;
+
+ case HIDPGETCONNINFO:
+ if (copy_from_user(&ci, argp, sizeof(ci)))
+ return -EFAULT;
+
+ err = hidp_get_conninfo(&ci);
+ if (!err && copy_to_user(argp, &ci, sizeof(ci)))
+ return -EFAULT;
+
+ return err;
+ }
+
+ return -EINVAL;
+}
+
+static int hidp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ return do_hidp_sock_ioctl(sock, cmd, (void __user *)arg);
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_hidp_connadd_req {
+ int ctrl_sock; /* Connected control socket */
+ int intr_sock; /* Connected interrupt socket */
+ __u16 parser;
+ __u16 rd_size;
+ compat_uptr_t rd_data;
+ __u8 country;
+ __u8 subclass;
+ __u16 vendor;
+ __u16 product;
+ __u16 version;
+ __u32 flags;
+ __u32 idle_to;
+ char name[128];
+};
+
+static int hidp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ void __user *argp = compat_ptr(arg);
+ int err;
+
+ if (cmd == HIDPGETCONNLIST) {
+ struct hidp_connlist_req cl;
+ u32 __user *p = argp;
+ u32 uci;
+
+ if (get_user(cl.cnum, p) || get_user(uci, p + 1))
+ return -EFAULT;
+
+ cl.ci = compat_ptr(uci);
+
+ if (cl.cnum <= 0)
+ return -EINVAL;
+
+ err = hidp_get_connlist(&cl);
+
+ if (!err && put_user(cl.cnum, p))
+ err = -EFAULT;
+
+ return err;
+ } else if (cmd == HIDPCONNADD) {
+ struct compat_hidp_connadd_req ca32;
+ struct hidp_connadd_req ca;
+ struct socket *csock;
+ struct socket *isock;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&ca32, (void __user *) arg, sizeof(ca32)))
+ return -EFAULT;
+
+ ca.ctrl_sock = ca32.ctrl_sock;
+ ca.intr_sock = ca32.intr_sock;
+ ca.parser = ca32.parser;
+ ca.rd_size = ca32.rd_size;
+ ca.rd_data = compat_ptr(ca32.rd_data);
+ ca.country = ca32.country;
+ ca.subclass = ca32.subclass;
+ ca.vendor = ca32.vendor;
+ ca.product = ca32.product;
+ ca.version = ca32.version;
+ ca.flags = ca32.flags;
+ ca.idle_to = ca32.idle_to;
+ ca32.name[sizeof(ca32.name) - 1] = '\0';
+ memcpy(ca.name, ca32.name, 128);
+
+ csock = sockfd_lookup(ca.ctrl_sock, &err);
+ if (!csock)
+ return err;
+
+ isock = sockfd_lookup(ca.intr_sock, &err);
+ if (!isock) {
+ sockfd_put(csock);
+ return err;
+ }
+
+ err = hidp_connection_add(&ca, csock, isock);
+ if (!err && copy_to_user(argp, &ca32, sizeof(ca32)))
+ err = -EFAULT;
+
+ sockfd_put(csock);
+ sockfd_put(isock);
+
+ return err;
+ }
+
+ return hidp_sock_ioctl(sock, cmd, arg);
+}
+#endif
+
+static const struct proto_ops hidp_sock_ops = {
+ .family = PF_BLUETOOTH,
+ .owner = THIS_MODULE,
+ .release = hidp_sock_release,
+ .ioctl = hidp_sock_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = hidp_sock_compat_ioctl,
+#endif
+ .bind = sock_no_bind,
+ .getname = sock_no_getname,
+ .sendmsg = sock_no_sendmsg,
+ .recvmsg = sock_no_recvmsg,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .connect = sock_no_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .mmap = sock_no_mmap
+};
+
+static struct proto hidp_proto = {
+ .name = "HIDP",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct bt_sock)
+};
+
+static int hidp_sock_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct sock *sk;
+
+ BT_DBG("sock %p", sock);
+
+ if (sock->type != SOCK_RAW)
+ return -ESOCKTNOSUPPORT;
+
+ sk = bt_sock_alloc(net, sock, &hidp_proto, protocol, GFP_ATOMIC, kern);
+ if (!sk)
+ return -ENOMEM;
+
+ sock->ops = &hidp_sock_ops;
+ sock->state = SS_UNCONNECTED;
+
+ bt_sock_link(&hidp_sk_list, sk);
+
+ return 0;
+}
+
+static const struct net_proto_family hidp_sock_family_ops = {
+ .family = PF_BLUETOOTH,
+ .owner = THIS_MODULE,
+ .create = hidp_sock_create
+};
+
+int __init hidp_init_sockets(void)
+{
+ int err;
+
+ err = proto_register(&hidp_proto, 0);
+ if (err < 0)
+ return err;
+
+ err = bt_sock_register(BTPROTO_HIDP, &hidp_sock_family_ops);
+ if (err < 0) {
+ BT_ERR("Can't register HIDP socket");
+ goto error;
+ }
+
+ err = bt_procfs_init(&init_net, "hidp", &hidp_sk_list, NULL);
+ if (err < 0) {
+ BT_ERR("Failed to create HIDP proc file");
+ bt_sock_unregister(BTPROTO_HIDP);
+ goto error;
+ }
+
+ BT_INFO("HIDP socket layer initialized");
+
+ return 0;
+
+error:
+ proto_unregister(&hidp_proto);
+ return err;
+}
+
+void __exit hidp_cleanup_sockets(void)
+{
+ bt_procfs_cleanup(&init_net, "hidp");
+ bt_sock_unregister(BTPROTO_HIDP);
+ proto_unregister(&hidp_proto);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 13:51:30 +0000