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>
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 @@
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 @@
*/
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);
