Bluetooth: Add support for sending system notes to monitor channel

The monitor channel can be used to send generic system notes as text
strings for debugging purposes. This adds the system note monitor code
and uses it for including kernel and subsystem version into traces.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

4 files changed, 35 insertions, 5 deletions

diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index 8d38f41..bfd1590 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -29,6 +29,8 @@
 #include <net/sock.h>
 #include <linux/seq_file.h>
 
+#define BT_SUBSYS_VERSION "2.21"
+
 #ifndef AF_BLUETOOTH
 #define AF_BLUETOOTH	31
 #define PF_BLUETOOTH	AF_BLUETOOTH
diff --git a/include/net/bluetooth/hci_mon.h b/include/net/bluetooth/hci_mon.h
index 2b67567..c91bb23 100644
--- a/include/net/bluetooth/hci_mon.h
+++ b/include/net/bluetooth/hci_mon.h
@@ -43,6 +43,7 @@ struct hci_mon_hdr {
 #define HCI_MON_CLOSE_INDEX	9
 #define HCI_MON_INDEX_INFO	10
 #define HCI_MON_VENDOR_DIAG	11
+#define HCI_MON_SYSTEM_NOTE	12
 
 struct hci_mon_new_index {
 	__u8		type;
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index a3bffd1..34c53d5 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -33,8 +33,6 @@
 
 #include "selftest.h"
 
-#define VERSION "2.21"
-
 /* Bluetooth sockets */
 #define BT_MAX_PROTO	8
 static const struct net_proto_family *bt_proto[BT_MAX_PROTO];
@@ -715,7 +713,7 @@ static int __init bt_init(void)
 
 	sock_skb_cb_check_size(sizeof(struct bt_skb_cb));
 
-	BT_INFO("Core ver %s", VERSION);
+	BT_INFO("Core ver %s", BT_SUBSYS_VERSION);
 
 	err = bt_selftest();
 	if (err < 0)
@@ -789,7 +787,7 @@ subsys_initcall(bt_init);
 module_exit(bt_exit);
 
 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
-MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
-MODULE_VERSION(VERSION);
+MODULE_DESCRIPTION("Bluetooth Core ver " BT_SUBSYS_VERSION);
+MODULE_VERSION(BT_SUBSYS_VERSION);
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 18a41ea..710265c 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -26,6 +26,8 @@
 
 #include <linux/export.h>
 #include <asm/unaligned.h>
+#include <generated/compile.h>
+#include <generated/utsrelease.h>
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
@@ -383,6 +385,29 @@ static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
 	return skb;
 }
 
+static void send_monitor_note(struct sock *sk, const char *text)
+{
+	size_t len = strlen(text);
+	struct hci_mon_hdr *hdr;
+	struct sk_buff *skb;
+
+	skb = bt_skb_alloc(len + 1, GFP_ATOMIC);
+	if (!skb)
+		return;
+
+	strcpy(skb_put(skb, len + 1), text);
+
+	__net_timestamp(skb);
+
+	hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
+	hdr->opcode = cpu_to_le16(HCI_MON_SYSTEM_NOTE);
+	hdr->index = cpu_to_le16(HCI_DEV_NONE);
+	hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
+
+	if (sock_queue_rcv_skb(sk, skb))
+		kfree_skb(skb);
+}
+
 static void send_monitor_replay(struct sock *sk)
 {
 	struct hci_dev *hdev;
@@ -872,6 +897,10 @@ static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
 		 */
 		hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
 
+		send_monitor_note(sk, "Linux version " UTS_RELEASE
+				      " (" UTS_MACHINE ")");
+		send_monitor_note(sk, "Bluetooth subsystem version "
+				      BT_SUBSYS_VERSION);
 		send_monitor_replay(sk);
 
 		atomic_inc(&monitor_promisc);