Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 1507 insertions, 0 deletions

diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
new file mode 100644
index 000000000..1111da4e2
--- /dev/null
+++ b/net/bluetooth/sco.c
@@ -0,0 +1,1507 @@
+/*
+   BlueZ - Bluetooth protocol stack for Linux
+   Copyright (C) 2000-2001 Qualcomm Incorporated
+
+   Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.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.
+*/
+
+/* Bluetooth SCO sockets. */
+
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/sched/signal.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/sco.h>
+
+static bool disable_esco;
+
+static const struct proto_ops sco_sock_ops;
+
+static struct bt_sock_list sco_sk_list = {
+	.lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
+};
+
+/* ---- SCO connections ---- */
+struct sco_conn {
+	struct hci_conn	*hcon;
+
+	spinlock_t	lock;
+	struct sock	*sk;
+
+	struct delayed_work	timeout_work;
+
+	unsigned int    mtu;
+};
+
+#define sco_conn_lock(c)	spin_lock(&c->lock)
+#define sco_conn_unlock(c)	spin_unlock(&c->lock)
+
+static void sco_sock_close(struct sock *sk);
+static void sco_sock_kill(struct sock *sk);
+
+/* ----- SCO socket info ----- */
+#define sco_pi(sk) ((struct sco_pinfo *) sk)
+
+struct sco_pinfo {
+	struct bt_sock	bt;
+	bdaddr_t	src;
+	bdaddr_t	dst;
+	__u32		flags;
+	__u16		setting;
+	__u8		cmsg_mask;
+	struct bt_codec codec;
+	struct sco_conn	*conn;
+};
+
+/* ---- SCO timers ---- */
+#define SCO_CONN_TIMEOUT	(HZ * 40)
+#define SCO_DISCONN_TIMEOUT	(HZ * 2)
+
+static void sco_sock_timeout(struct work_struct *work)
+{
+	struct sco_conn *conn = container_of(work, struct sco_conn,
+					     timeout_work.work);
+	struct sock *sk;
+
+	sco_conn_lock(conn);
+	sk = conn->sk;
+	if (sk)
+		sock_hold(sk);
+	sco_conn_unlock(conn);
+
+	if (!sk)
+		return;
+
+	BT_DBG("sock %p state %d", sk, sk->sk_state);
+
+	lock_sock(sk);
+	sk->sk_err = ETIMEDOUT;
+	sk->sk_state_change(sk);
+	release_sock(sk);
+	sock_put(sk);
+}
+
+static void sco_sock_set_timer(struct sock *sk, long timeout)
+{
+	if (!sco_pi(sk)->conn)
+		return;
+
+	BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
+	cancel_delayed_work(&sco_pi(sk)->conn->timeout_work);
+	schedule_delayed_work(&sco_pi(sk)->conn->timeout_work, timeout);
+}
+
+static void sco_sock_clear_timer(struct sock *sk)
+{
+	if (!sco_pi(sk)->conn)
+		return;
+
+	BT_DBG("sock %p state %d", sk, sk->sk_state);
+	cancel_delayed_work(&sco_pi(sk)->conn->timeout_work);
+}
+
+/* ---- SCO connections ---- */
+static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
+{
+	struct hci_dev *hdev = hcon->hdev;
+	struct sco_conn *conn = hcon->sco_data;
+
+	if (conn)
+		return conn;
+
+	conn = kzalloc(sizeof(struct sco_conn), GFP_KERNEL);
+	if (!conn)
+		return NULL;
+
+	spin_lock_init(&conn->lock);
+	INIT_DELAYED_WORK(&conn->timeout_work, sco_sock_timeout);
+
+	hcon->sco_data = conn;
+	conn->hcon = hcon;
+
+	if (hdev->sco_mtu > 0)
+		conn->mtu = hdev->sco_mtu;
+	else
+		conn->mtu = 60;
+
+	BT_DBG("hcon %p conn %p", hcon, conn);
+
+	return conn;
+}
+
+/* Delete channel.
+ * Must be called on the locked socket. */
+static void sco_chan_del(struct sock *sk, int err)
+{
+	struct sco_conn *conn;
+
+	conn = sco_pi(sk)->conn;
+
+	BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
+
+	if (conn) {
+		sco_conn_lock(conn);
+		conn->sk = NULL;
+		sco_pi(sk)->conn = NULL;
+		sco_conn_unlock(conn);
+
+		if (conn->hcon)
+			hci_conn_drop(conn->hcon);
+	}
+
+	sk->sk_state = BT_CLOSED;
+	sk->sk_err   = err;
+	sk->sk_state_change(sk);
+
+	sock_set_flag(sk, SOCK_ZAPPED);
+}
+
+static void sco_conn_del(struct hci_conn *hcon, int err)
+{
+	struct sco_conn *conn = hcon->sco_data;
+	struct sock *sk;
+
+	if (!conn)
+		return;
+
+	BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
+
+	/* Kill socket */
+	sco_conn_lock(conn);
+	sk = conn->sk;
+	if (sk)
+		sock_hold(sk);
+	sco_conn_unlock(conn);
+
+	if (sk) {
+		lock_sock(sk);
+		sco_sock_clear_timer(sk);
+		sco_chan_del(sk, err);
+		release_sock(sk);
+		sock_put(sk);
+	}
+
+	/* Ensure no more work items will run before freeing conn. */
+	cancel_delayed_work_sync(&conn->timeout_work);
+
+	hcon->sco_data = NULL;
+	kfree(conn);
+}
+
+static void __sco_chan_add(struct sco_conn *conn, struct sock *sk,
+			   struct sock *parent)
+{
+	BT_DBG("conn %p", conn);
+
+	sco_pi(sk)->conn = conn;
+	conn->sk = sk;
+
+	if (parent)
+		bt_accept_enqueue(parent, sk, true);
+}
+
+static int sco_chan_add(struct sco_conn *conn, struct sock *sk,
+			struct sock *parent)
+{
+	int err = 0;
+
+	sco_conn_lock(conn);
+	if (conn->sk)
+		err = -EBUSY;
+	else
+		__sco_chan_add(conn, sk, parent);
+
+	sco_conn_unlock(conn);
+	return err;
+}
+
+static int sco_connect(struct hci_dev *hdev, struct sock *sk)
+{
+	struct sco_conn *conn;
+	struct hci_conn *hcon;
+	int err, type;
+
+	BT_DBG("%pMR -> %pMR", &sco_pi(sk)->src, &sco_pi(sk)->dst);
+
+	if (lmp_esco_capable(hdev) && !disable_esco)
+		type = ESCO_LINK;
+	else
+		type = SCO_LINK;
+
+	if (sco_pi(sk)->setting == BT_VOICE_TRANSPARENT &&
+	    (!lmp_transp_capable(hdev) || !lmp_esco_capable(hdev)))
+		return -EOPNOTSUPP;
+
+	hcon = hci_connect_sco(hdev, type, &sco_pi(sk)->dst,
+			       sco_pi(sk)->setting, &sco_pi(sk)->codec);
+	if (IS_ERR(hcon))
+		return PTR_ERR(hcon);
+
+	conn = sco_conn_add(hcon);
+	if (!conn) {
+		hci_conn_drop(hcon);
+		return -ENOMEM;
+	}
+
+	/* Update source addr of the socket */
+	bacpy(&sco_pi(sk)->src, &hcon->src);
+
+	err = sco_chan_add(conn, sk, NULL);
+	if (err)
+		return err;
+
+	if (hcon->state == BT_CONNECTED) {
+		sco_sock_clear_timer(sk);
+		sk->sk_state = BT_CONNECTED;
+	} else {
+		sk->sk_state = BT_CONNECT;
+		sco_sock_set_timer(sk, sk->sk_sndtimeo);
+	}
+
+	return err;
+}
+
+static int sco_send_frame(struct sock *sk, struct sk_buff *skb)
+{
+	struct sco_conn *conn = sco_pi(sk)->conn;
+	int len = skb->len;
+
+	/* Check outgoing MTU */
+	if (len > conn->mtu)
+		return -EINVAL;
+
+	BT_DBG("sk %p len %d", sk, len);
+
+	hci_send_sco(conn->hcon, skb);
+
+	return len;
+}
+
+static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
+{
+	struct sock *sk;
+
+	sco_conn_lock(conn);
+	sk = conn->sk;
+	sco_conn_unlock(conn);
+
+	if (!sk)
+		goto drop;
+
+	BT_DBG("sk %p len %u", sk, skb->len);
+
+	if (sk->sk_state != BT_CONNECTED)
+		goto drop;
+
+	if (!sock_queue_rcv_skb(sk, skb))
+		return;
+
+drop:
+	kfree_skb(skb);
+}
+
+/* -------- Socket interface ---------- */
+static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba)
+{
+	struct sock *sk;
+
+	sk_for_each(sk, &sco_sk_list.head) {
+		if (sk->sk_state != BT_LISTEN)
+			continue;
+
+		if (!bacmp(&sco_pi(sk)->src, ba))
+			return sk;
+	}
+
+	return NULL;
+}
+
+/* Find socket listening on source bdaddr.
+ * Returns closest match.
+ */
+static struct sock *sco_get_sock_listen(bdaddr_t *src)
+{
+	struct sock *sk = NULL, *sk1 = NULL;
+
+	read_lock(&sco_sk_list.lock);
+
+	sk_for_each(sk, &sco_sk_list.head) {
+		if (sk->sk_state != BT_LISTEN)
+			continue;
+
+		/* Exact match. */
+		if (!bacmp(&sco_pi(sk)->src, src))
+			break;
+
+		/* Closest match */
+		if (!bacmp(&sco_pi(sk)->src, BDADDR_ANY))
+			sk1 = sk;
+	}
+
+	read_unlock(&sco_sk_list.lock);
+
+	return sk ? sk : sk1;
+}
+
+static void sco_sock_destruct(struct sock *sk)
+{
+	BT_DBG("sk %p", sk);
+
+	skb_queue_purge(&sk->sk_receive_queue);
+	skb_queue_purge(&sk->sk_write_queue);
+}
+
+static void sco_sock_cleanup_listen(struct sock *parent)
+{
+	struct sock *sk;
+
+	BT_DBG("parent %p", parent);
+
+	/* Close not yet accepted channels */
+	while ((sk = bt_accept_dequeue(parent, NULL))) {
+		sco_sock_close(sk);
+		sco_sock_kill(sk);
+	}
+
+	parent->sk_state  = BT_CLOSED;
+	sock_set_flag(parent, SOCK_ZAPPED);
+}
+
+/* Kill socket (only if zapped and orphan)
+ * Must be called on unlocked socket.
+ */
+static void sco_sock_kill(struct sock *sk)
+{
+	if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
+		return;
+
+	BT_DBG("sk %p state %d", sk, sk->sk_state);
+
+	/* Kill poor orphan */
+	bt_sock_unlink(&sco_sk_list, sk);
+	sock_set_flag(sk, SOCK_DEAD);
+	sock_put(sk);
+}
+
+static void __sco_sock_close(struct sock *sk)
+{
+	BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
+
+	switch (sk->sk_state) {
+	case BT_LISTEN:
+		sco_sock_cleanup_listen(sk);
+		break;
+
+	case BT_CONNECTED:
+	case BT_CONFIG:
+		if (sco_pi(sk)->conn->hcon) {
+			sk->sk_state = BT_DISCONN;
+			sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
+			sco_conn_lock(sco_pi(sk)->conn);
+			hci_conn_drop(sco_pi(sk)->conn->hcon);
+			sco_pi(sk)->conn->hcon = NULL;
+			sco_conn_unlock(sco_pi(sk)->conn);
+		} else
+			sco_chan_del(sk, ECONNRESET);
+		break;
+
+	case BT_CONNECT2:
+	case BT_CONNECT:
+	case BT_DISCONN:
+		sco_chan_del(sk, ECONNRESET);
+		break;
+
+	default:
+		sock_set_flag(sk, SOCK_ZAPPED);
+		break;
+	}
+
+}
+
+/* Must be called on unlocked socket. */
+static void sco_sock_close(struct sock *sk)
+{
+	lock_sock(sk);
+	sco_sock_clear_timer(sk);
+	__sco_sock_close(sk);
+	release_sock(sk);
+}
+
+static void sco_skb_put_cmsg(struct sk_buff *skb, struct msghdr *msg,
+			     struct sock *sk)
+{
+	if (sco_pi(sk)->cmsg_mask & SCO_CMSG_PKT_STATUS)
+		put_cmsg(msg, SOL_BLUETOOTH, BT_SCM_PKT_STATUS,
+			 sizeof(bt_cb(skb)->sco.pkt_status),
+			 &bt_cb(skb)->sco.pkt_status);
+}
+
+static void sco_sock_init(struct sock *sk, struct sock *parent)
+{
+	BT_DBG("sk %p", sk);
+
+	if (parent) {
+		sk->sk_type = parent->sk_type;
+		bt_sk(sk)->flags = bt_sk(parent)->flags;
+		security_sk_clone(parent, sk);
+	} else {
+		bt_sk(sk)->skb_put_cmsg = sco_skb_put_cmsg;
+	}
+}
+
+static struct proto sco_proto = {
+	.name		= "SCO",
+	.owner		= THIS_MODULE,
+	.obj_size	= sizeof(struct sco_pinfo)
+};
+
+static struct sock *sco_sock_alloc(struct net *net, struct socket *sock,
+				   int proto, gfp_t prio, int kern)
+{
+	struct sock *sk;
+
+	sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto, kern);
+	if (!sk)
+		return NULL;
+
+	sock_init_data(sock, sk);
+	INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
+
+	sk->sk_destruct = sco_sock_destruct;
+	sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
+
+	sock_reset_flag(sk, SOCK_ZAPPED);
+
+	sk->sk_protocol = proto;
+	sk->sk_state    = BT_OPEN;
+
+	sco_pi(sk)->setting = BT_VOICE_CVSD_16BIT;
+	sco_pi(sk)->codec.id = BT_CODEC_CVSD;
+	sco_pi(sk)->codec.cid = 0xffff;
+	sco_pi(sk)->codec.vid = 0xffff;
+	sco_pi(sk)->codec.data_path = 0x00;
+
+	bt_sock_link(&sco_sk_list, sk);
+	return sk;
+}
+
+static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
+			   int kern)
+{
+	struct sock *sk;
+
+	BT_DBG("sock %p", sock);
+
+	sock->state = SS_UNCONNECTED;
+
+	if (sock->type != SOCK_SEQPACKET)
+		return -ESOCKTNOSUPPORT;
+
+	sock->ops = &sco_sock_ops;
+
+	sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
+	if (!sk)
+		return -ENOMEM;
+
+	sco_sock_init(sk, NULL);
+	return 0;
+}
+
+static int sco_sock_bind(struct socket *sock, struct sockaddr *addr,
+			 int addr_len)
+{
+	struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
+	struct sock *sk = sock->sk;
+	int err = 0;
+
+	if (!addr || addr_len < sizeof(struct sockaddr_sco) ||
+	    addr->sa_family != AF_BLUETOOTH)
+		return -EINVAL;
+
+	BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
+
+	lock_sock(sk);
+
+	if (sk->sk_state != BT_OPEN) {
+		err = -EBADFD;
+		goto done;
+	}
+
+	if (sk->sk_type != SOCK_SEQPACKET) {
+		err = -EINVAL;
+		goto done;
+	}
+
+	bacpy(&sco_pi(sk)->src, &sa->sco_bdaddr);
+
+	sk->sk_state = BT_BOUND;
+
+done:
+	release_sock(sk);
+	return err;
+}
+
+static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
+{
+	struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
+	struct sock *sk = sock->sk;
+	struct hci_dev  *hdev;
+	int err;
+
+	BT_DBG("sk %p", sk);
+
+	if (alen < sizeof(struct sockaddr_sco) ||
+	    addr->sa_family != AF_BLUETOOTH)
+		return -EINVAL;
+
+	lock_sock(sk);
+	if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) {
+		err = -EBADFD;
+		goto done;
+	}
+
+	if (sk->sk_type != SOCK_SEQPACKET) {
+		err = -EINVAL;
+		goto done;
+	}
+
+	hdev = hci_get_route(&sa->sco_bdaddr, &sco_pi(sk)->src, BDADDR_BREDR);
+	if (!hdev) {
+		err = -EHOSTUNREACH;
+		goto done;
+	}
+	hci_dev_lock(hdev);
+
+	/* Set destination address and psm */
+	bacpy(&sco_pi(sk)->dst, &sa->sco_bdaddr);
+
+	err = sco_connect(hdev, sk);
+	hci_dev_unlock(hdev);
+	hci_dev_put(hdev);
+	if (err)
+		goto done;
+
+	err = bt_sock_wait_state(sk, BT_CONNECTED,
+				 sock_sndtimeo(sk, flags & O_NONBLOCK));
+
+done:
+	release_sock(sk);
+	return err;
+}
+
+static int sco_sock_listen(struct socket *sock, int backlog)
+{
+	struct sock *sk = sock->sk;
+	bdaddr_t *src = &sco_pi(sk)->src;
+	int err = 0;
+
+	BT_DBG("sk %p backlog %d", sk, backlog);
+
+	lock_sock(sk);
+
+	if (sk->sk_state != BT_BOUND) {
+		err = -EBADFD;
+		goto done;
+	}
+
+	if (sk->sk_type != SOCK_SEQPACKET) {
+		err = -EINVAL;
+		goto done;
+	}
+
+	write_lock(&sco_sk_list.lock);
+
+	if (__sco_get_sock_listen_by_addr(src)) {
+		err = -EADDRINUSE;
+		goto unlock;
+	}
+
+	sk->sk_max_ack_backlog = backlog;
+	sk->sk_ack_backlog = 0;
+
+	sk->sk_state = BT_LISTEN;
+
+unlock:
+	write_unlock(&sco_sk_list.lock);
+
+done:
+	release_sock(sk);
+	return err;
+}
+
+static int sco_sock_accept(struct socket *sock, struct socket *newsock,
+			   int flags, bool kern)
+{
+	DEFINE_WAIT_FUNC(wait, woken_wake_function);
+	struct sock *sk = sock->sk, *ch;
+	long timeo;
+	int err = 0;
+
+	lock_sock(sk);
+
+	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
+
+	BT_DBG("sk %p timeo %ld", sk, timeo);
+
+	/* Wait for an incoming connection. (wake-one). */
+	add_wait_queue_exclusive(sk_sleep(sk), &wait);
+	while (1) {
+		if (sk->sk_state != BT_LISTEN) {
+			err = -EBADFD;
+			break;
+		}
+
+		ch = bt_accept_dequeue(sk, newsock);
+		if (ch)
+			break;
+
+		if (!timeo) {
+			err = -EAGAIN;
+			break;
+		}
+
+		if (signal_pending(current)) {
+			err = sock_intr_errno(timeo);
+			break;
+		}
+
+		release_sock(sk);
+
+		timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
+		lock_sock(sk);
+	}
+	remove_wait_queue(sk_sleep(sk), &wait);
+
+	if (err)
+		goto done;
+
+	newsock->state = SS_CONNECTED;
+
+	BT_DBG("new socket %p", ch);
+
+done:
+	release_sock(sk);
+	return err;
+}
+
+static int sco_sock_getname(struct socket *sock, struct sockaddr *addr,
+			    int peer)
+{
+	struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
+	struct sock *sk = sock->sk;
+
+	BT_DBG("sock %p, sk %p", sock, sk);
+
+	addr->sa_family = AF_BLUETOOTH;
+
+	if (peer)
+		bacpy(&sa->sco_bdaddr, &sco_pi(sk)->dst);
+	else
+		bacpy(&sa->sco_bdaddr, &sco_pi(sk)->src);
+
+	return sizeof(struct sockaddr_sco);
+}
+
+static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
+			    size_t len)
+{
+	struct sock *sk = sock->sk;
+	struct sk_buff *skb;
+	int err;
+
+	BT_DBG("sock %p, sk %p", sock, sk);
+
+	err = sock_error(sk);
+	if (err)
+		return err;
+
+	if (msg->msg_flags & MSG_OOB)
+		return -EOPNOTSUPP;
+
+	skb = bt_skb_sendmsg(sk, msg, len, len, 0, 0);
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
+
+	lock_sock(sk);
+
+	if (sk->sk_state == BT_CONNECTED)
+		err = sco_send_frame(sk, skb);
+	else
+		err = -ENOTCONN;
+
+	release_sock(sk);
+
+	if (err < 0)
+		kfree_skb(skb);
+	return err;
+}
+
+static void sco_conn_defer_accept(struct hci_conn *conn, u16 setting)
+{
+	struct hci_dev *hdev = conn->hdev;
+
+	BT_DBG("conn %p", conn);
+
+	conn->state = BT_CONFIG;
+
+	if (!lmp_esco_capable(hdev)) {
+		struct hci_cp_accept_conn_req cp;
+
+		bacpy(&cp.bdaddr, &conn->dst);
+		cp.role = 0x00; /* Ignored */
+
+		hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
+	} else {
+		struct hci_cp_accept_sync_conn_req cp;
+
+		bacpy(&cp.bdaddr, &conn->dst);
+		cp.pkt_type = cpu_to_le16(conn->pkt_type);
+
+		cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
+		cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
+		cp.content_format = cpu_to_le16(setting);
+
+		switch (setting & SCO_AIRMODE_MASK) {
+		case SCO_AIRMODE_TRANSP:
+			if (conn->pkt_type & ESCO_2EV3)
+				cp.max_latency = cpu_to_le16(0x0008);
+			else
+				cp.max_latency = cpu_to_le16(0x000D);
+			cp.retrans_effort = 0x02;
+			break;
+		case SCO_AIRMODE_CVSD:
+			cp.max_latency = cpu_to_le16(0xffff);
+			cp.retrans_effort = 0xff;
+			break;
+		default:
+			/* use CVSD settings as fallback */
+			cp.max_latency = cpu_to_le16(0xffff);
+			cp.retrans_effort = 0xff;
+			break;
+		}
+
+		hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
+			     sizeof(cp), &cp);
+	}
+}
+
+static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
+			    size_t len, int flags)
+{
+	struct sock *sk = sock->sk;
+	struct sco_pinfo *pi = sco_pi(sk);
+
+	lock_sock(sk);
+
+	if (sk->sk_state == BT_CONNECT2 &&
+	    test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
+		sco_conn_defer_accept(pi->conn->hcon, pi->setting);
+		sk->sk_state = BT_CONFIG;
+
+		release_sock(sk);
+		return 0;
+	}
+
+	release_sock(sk);
+
+	return bt_sock_recvmsg(sock, msg, len, flags);
+}
+
+static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
+			       sockptr_t optval, unsigned int optlen)
+{
+	struct sock *sk = sock->sk;
+	int len, err = 0;
+	struct bt_voice voice;
+	u32 opt;
+	struct bt_codecs *codecs;
+	struct hci_dev *hdev;
+	__u8 buffer[255];
+
+	BT_DBG("sk %p", sk);
+
+	lock_sock(sk);
+
+	switch (optname) {
+
+	case BT_DEFER_SETUP:
+		if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
+			err = -EINVAL;
+			break;
+		}
+
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
+			err = -EFAULT;
+			break;
+		}
+
+		if (opt)
+			set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
+		else
+			clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
+		break;
+
+	case BT_VOICE:
+		if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
+		    sk->sk_state != BT_CONNECT2) {
+			err = -EINVAL;
+			break;
+		}
+
+		voice.setting = sco_pi(sk)->setting;
+
+		len = min_t(unsigned int, sizeof(voice), optlen);
+		if (copy_from_sockptr(&voice, optval, len)) {
+			err = -EFAULT;
+			break;
+		}
+
+		/* Explicitly check for these values */
+		if (voice.setting != BT_VOICE_TRANSPARENT &&
+		    voice.setting != BT_VOICE_CVSD_16BIT) {
+			err = -EINVAL;
+			break;
+		}
+
+		sco_pi(sk)->setting = voice.setting;
+		hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src,
+				     BDADDR_BREDR);
+		if (!hdev) {
+			err = -EBADFD;
+			break;
+		}
+		if (enhanced_sync_conn_capable(hdev) &&
+		    voice.setting == BT_VOICE_TRANSPARENT)
+			sco_pi(sk)->codec.id = BT_CODEC_TRANSPARENT;
+		hci_dev_put(hdev);
+		break;
+
+	case BT_PKT_STATUS:
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
+			err = -EFAULT;
+			break;
+		}
+
+		if (opt)
+			sco_pi(sk)->cmsg_mask |= SCO_CMSG_PKT_STATUS;
+		else
+			sco_pi(sk)->cmsg_mask &= SCO_CMSG_PKT_STATUS;
+		break;
+
+	case BT_CODEC:
+		if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
+		    sk->sk_state != BT_CONNECT2) {
+			err = -EINVAL;
+			break;
+		}
+
+		hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src,
+				     BDADDR_BREDR);
+		if (!hdev) {
+			err = -EBADFD;
+			break;
+		}
+
+		if (!hci_dev_test_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED)) {
+			hci_dev_put(hdev);
+			err = -EOPNOTSUPP;
+			break;
+		}
+
+		if (!hdev->get_data_path_id) {
+			hci_dev_put(hdev);
+			err = -EOPNOTSUPP;
+			break;
+		}
+
+		if (optlen < sizeof(struct bt_codecs) ||
+		    optlen > sizeof(buffer)) {
+			hci_dev_put(hdev);
+			err = -EINVAL;
+			break;
+		}
+
+		if (copy_from_sockptr(buffer, optval, optlen)) {
+			hci_dev_put(hdev);
+			err = -EFAULT;
+			break;
+		}
+
+		codecs = (void *)buffer;
+
+		if (codecs->num_codecs > 1) {
+			hci_dev_put(hdev);
+			err = -EINVAL;
+			break;
+		}
+
+		sco_pi(sk)->codec = codecs->codecs[0];
+		hci_dev_put(hdev);
+		break;
+
+	default:
+		err = -ENOPROTOOPT;
+		break;
+	}
+
+	release_sock(sk);
+	return err;
+}
+
+static int sco_sock_getsockopt_old(struct socket *sock, int optname,
+				   char __user *optval, int __user *optlen)
+{
+	struct sock *sk = sock->sk;
+	struct sco_options opts;
+	struct sco_conninfo cinfo;
+	int len, err = 0;
+
+	BT_DBG("sk %p", sk);
+
+	if (get_user(len, optlen))
+		return -EFAULT;
+
+	lock_sock(sk);
+
+	switch (optname) {
+	case SCO_OPTIONS:
+		if (sk->sk_state != BT_CONNECTED &&
+		    !(sk->sk_state == BT_CONNECT2 &&
+		      test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
+			err = -ENOTCONN;
+			break;
+		}
+
+		opts.mtu = sco_pi(sk)->conn->mtu;
+
+		BT_DBG("mtu %u", opts.mtu);
+
+		len = min_t(unsigned int, len, sizeof(opts));
+		if (copy_to_user(optval, (char *)&opts, len))
+			err = -EFAULT;
+
+		break;
+
+	case SCO_CONNINFO:
+		if (sk->sk_state != BT_CONNECTED &&
+		    !(sk->sk_state == BT_CONNECT2 &&
+		      test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
+			err = -ENOTCONN;
+			break;
+		}
+
+		memset(&cinfo, 0, sizeof(cinfo));
+		cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
+		memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
+
+		len = min_t(unsigned int, len, sizeof(cinfo));
+		if (copy_to_user(optval, (char *)&cinfo, len))
+			err = -EFAULT;
+
+		break;
+
+	default:
+		err = -ENOPROTOOPT;
+		break;
+	}
+
+	release_sock(sk);
+	return err;
+}
+
+static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
+			       char __user *optval, int __user *optlen)
+{
+	struct sock *sk = sock->sk;
+	int len, err = 0;
+	struct bt_voice voice;
+	u32 phys;
+	int pkt_status;
+	int buf_len;
+	struct codec_list *c;
+	u8 num_codecs, i, __user *ptr;
+	struct hci_dev *hdev;
+	struct hci_codec_caps *caps;
+	struct bt_codec codec;
+
+	BT_DBG("sk %p", sk);
+
+	if (level == SOL_SCO)
+		return sco_sock_getsockopt_old(sock, optname, optval, optlen);
+
+	if (get_user(len, optlen))
+		return -EFAULT;
+
+	lock_sock(sk);
+
+	switch (optname) {
+
+	case BT_DEFER_SETUP:
+		if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
+			err = -EINVAL;
+			break;
+		}
+
+		if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
+			     (u32 __user *)optval))
+			err = -EFAULT;
+
+		break;
+
+	case BT_VOICE:
+		voice.setting = sco_pi(sk)->setting;
+
+		len = min_t(unsigned int, len, sizeof(voice));
+		if (copy_to_user(optval, (char *)&voice, len))
+			err = -EFAULT;
+
+		break;
+
+	case BT_PHY:
+		if (sk->sk_state != BT_CONNECTED) {
+			err = -ENOTCONN;
+			break;
+		}
+
+		phys = hci_conn_get_phy(sco_pi(sk)->conn->hcon);
+
+		if (put_user(phys, (u32 __user *) optval))
+			err = -EFAULT;
+		break;
+
+	case BT_PKT_STATUS:
+		pkt_status = (sco_pi(sk)->cmsg_mask & SCO_CMSG_PKT_STATUS);
+
+		if (put_user(pkt_status, (int __user *)optval))
+			err = -EFAULT;
+		break;
+
+	case BT_SNDMTU:
+	case BT_RCVMTU:
+		if (sk->sk_state != BT_CONNECTED) {
+			err = -ENOTCONN;
+			break;
+		}
+
+		if (put_user(sco_pi(sk)->conn->mtu, (u32 __user *)optval))
+			err = -EFAULT;
+		break;
+
+	case BT_CODEC:
+		num_codecs = 0;
+		buf_len = 0;
+
+		hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src, BDADDR_BREDR);
+		if (!hdev) {
+			err = -EBADFD;
+			break;
+		}
+
+		if (!hci_dev_test_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED)) {
+			hci_dev_put(hdev);
+			err = -EOPNOTSUPP;
+			break;
+		}
+
+		if (!hdev->get_data_path_id) {
+			hci_dev_put(hdev);
+			err = -EOPNOTSUPP;
+			break;
+		}
+
+		/* find total buffer size required to copy codec + caps */
+		hci_dev_lock(hdev);
+		list_for_each_entry(c, &hdev->local_codecs, list) {
+			if (c->transport != HCI_TRANSPORT_SCO_ESCO)
+				continue;
+			num_codecs++;
+			for (i = 0, caps = c->caps; i < c->num_caps; i++) {
+				buf_len += 1 + caps->len;
+				caps = (void *)&caps->data[caps->len];
+			}
+			buf_len += sizeof(struct bt_codec);
+		}
+		hci_dev_unlock(hdev);
+
+		buf_len += sizeof(struct bt_codecs);
+		if (buf_len > len) {
+			hci_dev_put(hdev);
+			err = -ENOBUFS;
+			break;
+		}
+		ptr = optval;
+
+		if (put_user(num_codecs, ptr)) {
+			hci_dev_put(hdev);
+			err = -EFAULT;
+			break;
+		}
+		ptr += sizeof(num_codecs);
+
+		/* Iterate all the codecs supported over SCO and populate
+		 * codec data
+		 */
+		hci_dev_lock(hdev);
+		list_for_each_entry(c, &hdev->local_codecs, list) {
+			if (c->transport != HCI_TRANSPORT_SCO_ESCO)
+				continue;
+
+			codec.id = c->id;
+			codec.cid = c->cid;
+			codec.vid = c->vid;
+			err = hdev->get_data_path_id(hdev, &codec.data_path);
+			if (err < 0)
+				break;
+			codec.num_caps = c->num_caps;
+			if (copy_to_user(ptr, &codec, sizeof(codec))) {
+				err = -EFAULT;
+				break;
+			}
+			ptr += sizeof(codec);
+
+			/* find codec capabilities data length */
+			len = 0;
+			for (i = 0, caps = c->caps; i < c->num_caps; i++) {
+				len += 1 + caps->len;
+				caps = (void *)&caps->data[caps->len];
+			}
+
+			/* copy codec capabilities data */
+			if (len && copy_to_user(ptr, c->caps, len)) {
+				err = -EFAULT;
+				break;
+			}
+			ptr += len;
+		}
+
+		if (!err && put_user(buf_len, optlen))
+			err = -EFAULT;
+
+		hci_dev_unlock(hdev);
+		hci_dev_put(hdev);
+
+		break;
+
+	default:
+		err = -ENOPROTOOPT;
+		break;
+	}
+
+	release_sock(sk);
+	return err;
+}
+
+static int sco_sock_shutdown(struct socket *sock, int how)
+{
+	struct sock *sk = sock->sk;
+	int err = 0;
+
+	BT_DBG("sock %p, sk %p", sock, sk);
+
+	if (!sk)
+		return 0;
+
+	sock_hold(sk);
+	lock_sock(sk);
+
+	if (!sk->sk_shutdown) {
+		sk->sk_shutdown = SHUTDOWN_MASK;
+		sco_sock_clear_timer(sk);
+		__sco_sock_close(sk);
+
+		if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
+		    !(current->flags & PF_EXITING))
+			err = bt_sock_wait_state(sk, BT_CLOSED,
+						 sk->sk_lingertime);
+	}
+
+	release_sock(sk);
+	sock_put(sk);
+
+	return err;
+}
+
+static int sco_sock_release(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+	int err = 0;
+
+	BT_DBG("sock %p, sk %p", sock, sk);
+
+	if (!sk)
+		return 0;
+
+	sco_sock_close(sk);
+
+	if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
+	    !(current->flags & PF_EXITING)) {
+		lock_sock(sk);
+		err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
+		release_sock(sk);
+	}
+
+	sock_orphan(sk);
+	sco_sock_kill(sk);
+	return err;
+}
+
+static void sco_conn_ready(struct sco_conn *conn)
+{
+	struct sock *parent;
+	struct sock *sk = conn->sk;
+
+	BT_DBG("conn %p", conn);
+
+	if (sk) {
+		lock_sock(sk);
+		sco_sock_clear_timer(sk);
+		sk->sk_state = BT_CONNECTED;
+		sk->sk_state_change(sk);
+		release_sock(sk);
+	} else {
+		sco_conn_lock(conn);
+
+		if (!conn->hcon) {
+			sco_conn_unlock(conn);
+			return;
+		}
+
+		parent = sco_get_sock_listen(&conn->hcon->src);
+		if (!parent) {
+			sco_conn_unlock(conn);
+			return;
+		}
+
+		lock_sock(parent);
+
+		sk = sco_sock_alloc(sock_net(parent), NULL,
+				    BTPROTO_SCO, GFP_ATOMIC, 0);
+		if (!sk) {
+			release_sock(parent);
+			sco_conn_unlock(conn);
+			return;
+		}
+
+		sco_sock_init(sk, parent);
+
+		bacpy(&sco_pi(sk)->src, &conn->hcon->src);
+		bacpy(&sco_pi(sk)->dst, &conn->hcon->dst);
+
+		hci_conn_hold(conn->hcon);
+		__sco_chan_add(conn, sk, parent);
+
+		if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
+			sk->sk_state = BT_CONNECT2;
+		else
+			sk->sk_state = BT_CONNECTED;
+
+		/* Wake up parent */
+		parent->sk_data_ready(parent);
+
+		release_sock(parent);
+
+		sco_conn_unlock(conn);
+	}
+}
+
+/* ----- SCO interface with lower layer (HCI) ----- */
+int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
+{
+	struct sock *sk;
+	int lm = 0;
+
+	BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
+
+	/* Find listening sockets */
+	read_lock(&sco_sk_list.lock);
+	sk_for_each(sk, &sco_sk_list.head) {
+		if (sk->sk_state != BT_LISTEN)
+			continue;
+
+		if (!bacmp(&sco_pi(sk)->src, &hdev->bdaddr) ||
+		    !bacmp(&sco_pi(sk)->src, BDADDR_ANY)) {
+			lm |= HCI_LM_ACCEPT;
+
+			if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
+				*flags |= HCI_PROTO_DEFER;
+			break;
+		}
+	}
+	read_unlock(&sco_sk_list.lock);
+
+	return lm;
+}
+
+static void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
+{
+	if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
+		return;
+
+	BT_DBG("hcon %p bdaddr %pMR status %u", hcon, &hcon->dst, status);
+
+	if (!status) {
+		struct sco_conn *conn;
+
+		conn = sco_conn_add(hcon);
+		if (conn)
+			sco_conn_ready(conn);
+	} else
+		sco_conn_del(hcon, bt_to_errno(status));
+}
+
+static void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
+{
+	if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
+		return;
+
+	BT_DBG("hcon %p reason %d", hcon, reason);
+
+	sco_conn_del(hcon, bt_to_errno(reason));
+}
+
+void sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
+{
+	struct sco_conn *conn = hcon->sco_data;
+
+	if (!conn)
+		goto drop;
+
+	BT_DBG("conn %p len %u", conn, skb->len);
+
+	if (skb->len) {
+		sco_recv_frame(conn, skb);
+		return;
+	}
+
+drop:
+	kfree_skb(skb);
+}
+
+static struct hci_cb sco_cb = {
+	.name		= "SCO",
+	.connect_cfm	= sco_connect_cfm,
+	.disconn_cfm	= sco_disconn_cfm,
+};
+
+static int sco_debugfs_show(struct seq_file *f, void *p)
+{
+	struct sock *sk;
+
+	read_lock(&sco_sk_list.lock);
+
+	sk_for_each(sk, &sco_sk_list.head) {
+		seq_printf(f, "%pMR %pMR %d\n", &sco_pi(sk)->src,
+			   &sco_pi(sk)->dst, sk->sk_state);
+	}
+
+	read_unlock(&sco_sk_list.lock);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(sco_debugfs);
+
+static struct dentry *sco_debugfs;
+
+static const struct proto_ops sco_sock_ops = {
+	.family		= PF_BLUETOOTH,
+	.owner		= THIS_MODULE,
+	.release	= sco_sock_release,
+	.bind		= sco_sock_bind,
+	.connect	= sco_sock_connect,
+	.listen		= sco_sock_listen,
+	.accept		= sco_sock_accept,
+	.getname	= sco_sock_getname,
+	.sendmsg	= sco_sock_sendmsg,
+	.recvmsg	= sco_sock_recvmsg,
+	.poll		= bt_sock_poll,
+	.ioctl		= bt_sock_ioctl,
+	.gettstamp	= sock_gettstamp,
+	.mmap		= sock_no_mmap,
+	.socketpair	= sock_no_socketpair,
+	.shutdown	= sco_sock_shutdown,
+	.setsockopt	= sco_sock_setsockopt,
+	.getsockopt	= sco_sock_getsockopt
+};
+
+static const struct net_proto_family sco_sock_family_ops = {
+	.family	= PF_BLUETOOTH,
+	.owner	= THIS_MODULE,
+	.create	= sco_sock_create,
+};
+
+int __init sco_init(void)
+{
+	int err;
+
+	BUILD_BUG_ON(sizeof(struct sockaddr_sco) > sizeof(struct sockaddr));
+
+	err = proto_register(&sco_proto, 0);
+	if (err < 0)
+		return err;
+
+	err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
+	if (err < 0) {
+		BT_ERR("SCO socket registration failed");
+		goto error;
+	}
+
+	err = bt_procfs_init(&init_net, "sco", &sco_sk_list, NULL);
+	if (err < 0) {
+		BT_ERR("Failed to create SCO proc file");
+		bt_sock_unregister(BTPROTO_SCO);
+		goto error;
+	}
+
+	BT_INFO("SCO socket layer initialized");
+
+	hci_register_cb(&sco_cb);
+
+	if (IS_ERR_OR_NULL(bt_debugfs))
+		return 0;
+
+	sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
+					  NULL, &sco_debugfs_fops);
+
+	return 0;
+
+error:
+	proto_unregister(&sco_proto);
+	return err;
+}
+
+void sco_exit(void)
+{
+	bt_procfs_cleanup(&init_net, "sco");
+
+	debugfs_remove(sco_debugfs);
+
+	hci_unregister_cb(&sco_cb);
+
+	bt_sock_unregister(BTPROTO_SCO);
+
+	proto_unregister(&sco_proto);
+}
+
+module_param(disable_esco, bool, 0644);
+MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");