Bluetooth: 6LoWPAN: Use connected oriented channel instead of fixed one

Create a CoC dynamically instead of one fixed channel for communication
to peer devices.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/hci.h

@@ -145,7 +145,6 @@ enum {
 	HCI_PERIODIC_INQ,
 	HCI_FAST_CONNECTABLE,
 	HCI_BREDR_ENABLED,
-	HCI_6LOWPAN_ENABLED,
 	HCI_LE_SCAN_INTERRUPTED,
 };
 

include/net/bluetooth/hci_core.h

@@ -521,7 +521,6 @@ enum {
 	HCI_CONN_AES_CCM,
 	HCI_CONN_POWER_SAVE,
 	HCI_CONN_REMOTE_OOB,
-	HCI_CONN_6LOWPAN,
 };
 
 static inline bool hci_conn_ssp_enabled(struct hci_conn *conn)

include/net/bluetooth/l2cap.h

@@ -137,7 +137,6 @@ struct l2cap_conninfo {
 #define L2CAP_FC_L2CAP		0x02
 #define L2CAP_FC_CONNLESS	0x04
 #define L2CAP_FC_A2MP		0x08
-#define L2CAP_FC_6LOWPAN        0x3e /* reserved and temporary value */
 
 /* L2CAP Control Field bit masks */
 #define L2CAP_CTRL_SAR			0xC000

net/bluetooth/6lowpan.h

-/*
-   Copyright (c) 2013 Intel Corp.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License version 2 and
-   only version 2 as published by the Free Software Foundation.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-*/
-
-#ifndef __6LOWPAN_H
-#define __6LOWPAN_H
-
-#include <linux/errno.h>
-#include <linux/skbuff.h>
-#include <net/bluetooth/l2cap.h>
-
-#if IS_ENABLED(CONFIG_BT_6LOWPAN)
-int bt_6lowpan_recv(struct l2cap_conn *conn, struct sk_buff *skb);
-int bt_6lowpan_add_conn(struct l2cap_conn *conn);
-int bt_6lowpan_del_conn(struct l2cap_conn *conn);
-int bt_6lowpan_init(void);
-void bt_6lowpan_cleanup(void);
-#else
-static int bt_6lowpan_recv(struct l2cap_conn *conn, struct sk_buff *skb)
-{
-	return -EOPNOTSUPP;
-}
-static int bt_6lowpan_add_conn(struct l2cap_conn *conn)
-{
-	return -EOPNOTSUPP;
-}
-int bt_6lowpan_del_conn(struct l2cap_conn *conn)
-{
-	return -EOPNOTSUPP;
-}
-static int bt_6lowpan_init(void)
-{
-	return -EOPNOTSUPP;
-}
-static void bt_6lowpan_cleanup(void) { }
-#endif
-
-#endif /* __6LOWPAN_H */

net/bluetooth/hci_core.c

@@ -928,49 +928,6 @@ static int adv_channel_map_get(void *data, u64 *val)
 DEFINE_SIMPLE_ATTRIBUTE(adv_channel_map_fops, adv_channel_map_get,
 			adv_channel_map_set, "%llu\n");
 
-static ssize_t lowpan_read(struct file *file, char __user *user_buf,
-			   size_t count, loff_t *ppos)
-{
-	struct hci_dev *hdev = file->private_data;
-	char buf[3];
-
-	buf[0] = test_bit(HCI_6LOWPAN_ENABLED, &hdev->dev_flags) ? 'Y' : 'N';
-	buf[1] = '\n';
-	buf[2] = '\0';
-	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
-}
-
-static ssize_t lowpan_write(struct file *fp, const char __user *user_buffer,
-			    size_t count, loff_t *position)
-{
-	struct hci_dev *hdev = fp->private_data;
-	bool enable;
-	char buf[32];
-	size_t buf_size = min(count, (sizeof(buf)-1));
-
-	if (copy_from_user(buf, user_buffer, buf_size))
-		return -EFAULT;
-
-	buf[buf_size] = '\0';
-
-	if (strtobool(buf, &enable) < 0)
-		return -EINVAL;
-
-	if (enable == test_bit(HCI_6LOWPAN_ENABLED, &hdev->dev_flags))
-		return -EALREADY;
-
-	change_bit(HCI_6LOWPAN_ENABLED, &hdev->dev_flags);
-
-	return count;
-}
-
-static const struct file_operations lowpan_debugfs_fops = {
-	.open		= simple_open,
-	.read		= lowpan_read,
-	.write		= lowpan_write,
-	.llseek		= default_llseek,
-};
-
 static int le_auto_conn_show(struct seq_file *sf, void *ptr)
 {
 	struct hci_dev *hdev = sf->private;
@@ -1881,8 +1838,6 @@ static int __hci_init(struct hci_dev *hdev)
 				    hdev, &conn_max_interval_fops);
 		debugfs_create_file("adv_channel_map", 0644, hdev->debugfs,
 				    hdev, &adv_channel_map_fops);
-		debugfs_create_file("6lowpan", 0644, hdev->debugfs, hdev,
-				    &lowpan_debugfs_fops);
 		debugfs_create_file("le_auto_conn", 0644, hdev->debugfs, hdev,
 				    &le_auto_conn_fops);
 		debugfs_create_u16("discov_interleaved_timeout", 0644,

net/bluetooth/hci_event.c

@@ -4056,9 +4056,6 @@ static void hci_le_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 	conn->handle = __le16_to_cpu(ev->handle);
 	conn->state = BT_CONNECTED;
 
-	if (test_bit(HCI_6LOWPAN_ENABLED, &hdev->dev_flags))
-		set_bit(HCI_CONN_6LOWPAN, &conn->flags);
-
 	hci_conn_add_sysfs(conn);
 
 	hci_proto_connect_cfm(conn, ev->status);

net/bluetooth/l2cap_core.c

@@ -40,7 +40,6 @@
 #include "smp.h"
 #include "a2mp.h"
 #include "amp.h"
-#include "6lowpan.h"
 
 #define LE_FLOWCTL_MAX_CREDITS 65535
 
@@ -205,6 +204,7 @@ int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
 	write_unlock(&chan_list_lock);
 	return err;
 }
+EXPORT_SYMBOL_GPL(l2cap_add_psm);
 
 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid)
 {
@@ -437,6 +437,7 @@ struct l2cap_chan *l2cap_chan_create(void)
 
 	return chan;
 }
+EXPORT_SYMBOL_GPL(l2cap_chan_create);
 
 static void l2cap_chan_destroy(struct kref *kref)
 {
@@ -464,6 +465,7 @@ void l2cap_chan_put(struct l2cap_chan *c)
 
 	kref_put(&c->kref, l2cap_chan_destroy);
 }
+EXPORT_SYMBOL_GPL(l2cap_chan_put);
 
 void l2cap_chan_set_defaults(struct l2cap_chan *chan)
 {
@@ -482,6 +484,7 @@ void l2cap_chan_set_defaults(struct l2cap_chan *chan)
 
 	set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
 }
+EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults);
 
 static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
 {
@@ -614,6 +617,7 @@ void l2cap_chan_del(struct l2cap_chan *chan, int err)
 
 	return;
 }
+EXPORT_SYMBOL_GPL(l2cap_chan_del);
 
 void l2cap_conn_update_id_addr(struct hci_conn *hcon)
 {
@@ -717,6 +721,7 @@ void l2cap_chan_close(struct l2cap_chan *chan, int reason)
 		break;
 	}
 }
+EXPORT_SYMBOL(l2cap_chan_close);
 
 static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
 {
@@ -1460,8 +1465,6 @@ static void l2cap_le_conn_ready(struct l2cap_conn *conn)
 
 	BT_DBG("");
 
-	bt_6lowpan_add_conn(conn);
-
 	/* Check if we have socket listening on cid */
 	pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
 					  &hcon->src, &hcon->dst);
@@ -2555,6 +2558,7 @@ int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
 
 	return err;
 }
+EXPORT_SYMBOL_GPL(l2cap_chan_send);
 
 static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
 {
@@ -6933,10 +6937,6 @@ static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
 			l2cap_conn_del(conn->hcon, EACCES);
 		break;
 
-	case L2CAP_FC_6LOWPAN:
-		bt_6lowpan_recv(conn, skb);
-		break;
-
 	default:
 		l2cap_data_channel(conn, cid, skb);
 		break;
@@ -7183,6 +7183,7 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 	hci_dev_put(hdev);
 	return err;
 }
+EXPORT_SYMBOL_GPL(l2cap_chan_connect);
 
 /* ---- L2CAP interface with lower layer (HCI) ---- */
 
@@ -7245,8 +7246,6 @@ void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
 {
 	BT_DBG("hcon %p reason %d", hcon, reason);
 
-	bt_6lowpan_del_conn(hcon->l2cap_data);
-
 	l2cap_conn_del(hcon, bt_to_errno(reason));
 }
 
@@ -7529,14 +7528,11 @@ int __init l2cap_init(void)
 	debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
 			   &le_default_mps);
 
-	bt_6lowpan_init();
-
 	return 0;
 }
 
 void l2cap_exit(void)
 {
-	bt_6lowpan_cleanup();
 	debugfs_remove(l2cap_debugfs);
 	l2cap_cleanup_sockets();
 }