Bluetooth: Add support for sending MGMT commands and events to monitor

This adds support for tracing all management commands and events via the
monitor interface.

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

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 9f181b5..a48f71d 100644 (file)
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1406,6 +1406,9 @@ void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb);
 void hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
                         int flag, struct sock *skip_sk);
 void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb);
+void hci_send_monitor_ctrl_event(struct hci_dev *hdev, u16 event,
+                                void *data, u16 data_len, ktime_t tstamp,
+                                int flag, struct sock *skip_sk);
 
 void hci_sock_dev_event(struct hci_dev *hdev, int event);
 

diff --git a/include/net/bluetooth/hci_mon.h b/include/net/bluetooth/hci_mon.h
index 9640790..240786b 100644 (file)
--- a/include/net/bluetooth/hci_mon.h
+++ b/include/net/bluetooth/hci_mon.h
@@ -47,6 +47,8 @@ struct hci_mon_hdr {
 #define HCI_MON_USER_LOGGING   13
 #define HCI_MON_CTRL_OPEN      14
 #define HCI_MON_CTRL_CLOSE     15
+#define HCI_MON_CTRL_COMMAND   16
+#define HCI_MON_CTRL_EVENT     17
 
 struct hci_mon_new_index {
        __u8            type;

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 2d87250..576ea48 100644 (file)
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -315,6 +315,60 @@ void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
        kfree_skb(skb_copy);
 }
 
+void hci_send_monitor_ctrl_event(struct hci_dev *hdev, u16 event,
+                                void *data, u16 data_len, ktime_t tstamp,
+                                int flag, struct sock *skip_sk)
+{
+       struct sock *sk;
+       __le16 index;
+
+       if (hdev)
+               index = cpu_to_le16(hdev->id);
+       else
+               index = cpu_to_le16(MGMT_INDEX_NONE);
+
+       read_lock(&hci_sk_list.lock);
+
+       sk_for_each(sk, &hci_sk_list.head) {
+               struct hci_mon_hdr *hdr;
+               struct sk_buff *skb;
+
+               if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL)
+                       continue;
+
+               /* Ignore socket without the flag set */
+               if (!hci_sock_test_flag(sk, flag))
+                       continue;
+
+               /* Skip the original socket */
+               if (sk == skip_sk)
+                       continue;
+
+               skb = bt_skb_alloc(6 + data_len, GFP_ATOMIC);
+               if (!skb)
+                       continue;
+
+               put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
+               put_unaligned_le16(event, skb_put(skb, 2));
+
+               if (data)
+                       memcpy(skb_put(skb, data_len), data, data_len);
+
+               skb->tstamp = tstamp;
+
+               hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
+               hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT);
+               hdr->index = index;
+               hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
+
+               hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
+                                   HCI_SOCK_TRUSTED, NULL);
+               kfree_skb(skb);
+       }
+
+       read_unlock(&hci_sk_list.lock);
+}
+
 static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
 {
        struct hci_mon_hdr *hdr;
@@ -447,6 +501,33 @@ static struct sk_buff *create_monitor_ctrl_close(struct sock *sk)
        return skb;
 }
 
+static struct sk_buff *create_monitor_ctrl_command(struct sock *sk, u16 index,
+                                                  u16 opcode, u16 len,
+                                                  const void *buf)
+{
+       struct hci_mon_hdr *hdr;
+       struct sk_buff *skb;
+
+       skb = bt_skb_alloc(6 + len, GFP_ATOMIC);
+       if (!skb)
+               return NULL;
+
+       put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
+       put_unaligned_le16(opcode, skb_put(skb, 2));
+
+       if (buf)
+               memcpy(skb_put(skb, len), buf, len);
+
+       __net_timestamp(skb);
+
+       hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
+       hdr->opcode = cpu_to_le16(HCI_MON_CTRL_COMMAND);
+       hdr->index = cpu_to_le16(index);
+       hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
+
+       return skb;
+}
+
 static void __printf(2, 3)
 send_monitor_note(struct sock *sk, const char *fmt, ...)
 {
@@ -1257,6 +1338,19 @@ static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk,
                goto done;
        }
 
+       if (chan->channel == HCI_CHANNEL_CONTROL) {
+               struct sk_buff *skb;
+
+               /* Send event to monitor */
+               skb = create_monitor_ctrl_command(sk, index, opcode, len,
+                                                 buf + sizeof(*hdr));
+               if (skb) {
+                       hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
+                                           HCI_SOCK_TRUSTED, NULL);
+                       kfree_skb(skb);
+               }
+       }
+
        if (opcode >= chan->handler_count ||
            chan->handlers[opcode].func == NULL) {
                BT_DBG("Unknown op %u", opcode);

diff --git a/net/bluetooth/mgmt_util.c b/net/bluetooth/mgmt_util.c
index 8c30c7e..c933bd0 100644 (file)
--- a/net/bluetooth/mgmt_util.c
+++ b/net/bluetooth/mgmt_util.c
@@ -21,12 +21,41 @@
    SOFTWARE IS DISCLAIMED.
 */
 
+#include <asm/unaligned.h>
+
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/hci_mon.h>
 #include <net/bluetooth/mgmt.h>
 
 #include "mgmt_util.h"
 
+static struct sk_buff *create_monitor_ctrl_event(__le16 index, u32 cookie,
+                                                u16 opcode, u16 len, void *buf)
+{
+       struct hci_mon_hdr *hdr;
+       struct sk_buff *skb;
+
+       skb = bt_skb_alloc(6 + len, GFP_ATOMIC);
+       if (!skb)
+               return NULL;
+
+       put_unaligned_le32(cookie, skb_put(skb, 4));
+       put_unaligned_le16(opcode, skb_put(skb, 2));
+
+       if (buf)
+               memcpy(skb_put(skb, len), buf, len);
+
+       __net_timestamp(skb);
+
+       hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
+       hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT);
+       hdr->index = index;
+       hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
+
+       return skb;
+}
+
 int mgmt_send_event(u16 event, struct hci_dev *hdev, unsigned short channel,
                    void *data, u16 data_len, int flag, struct sock *skip_sk)
 {
@@ -52,14 +81,18 @@ int mgmt_send_event(u16 event, struct hci_dev *hdev, unsigned short channel,
        __net_timestamp(skb);
 
        hci_send_to_channel(channel, skb, flag, skip_sk);
-       kfree_skb(skb);
 
+       if (channel == HCI_CHANNEL_CONTROL)
+               hci_send_monitor_ctrl_event(hdev, event, data, data_len,
+                                           skb_get_ktime(skb), flag, skip_sk);
+
+       kfree_skb(skb);
        return 0;
 }
 
 int mgmt_cmd_status(struct sock *sk, u16 index, u16 cmd, u8 status)
 {
-       struct sk_buff *skb;
+       struct sk_buff *skb, *mskb;
        struct mgmt_hdr *hdr;
        struct mgmt_ev_cmd_status *ev;
        int err;
@@ -80,17 +113,30 @@ int mgmt_cmd_status(struct sock *sk, u16 index, u16 cmd, u8 status)
        ev->status = status;
        ev->opcode = cpu_to_le16(cmd);
 
+       mskb = create_monitor_ctrl_event(hdr->index, hci_sock_get_cookie(sk),
+                                        MGMT_EV_CMD_STATUS, sizeof(*ev), ev);
+       if (mskb)
+               skb->tstamp = mskb->tstamp;
+       else
+               __net_timestamp(skb);
+
        err = sock_queue_rcv_skb(sk, skb);
        if (err < 0)
                kfree_skb(skb);
 
+       if (mskb) {
+               hci_send_to_channel(HCI_CHANNEL_MONITOR, mskb,
+                                   HCI_SOCK_TRUSTED, NULL);
+               kfree_skb(mskb);
+       }
+
        return err;
 }
 
 int mgmt_cmd_complete(struct sock *sk, u16 index, u16 cmd, u8 status,
                      void *rp, size_t rp_len)
 {
-       struct sk_buff *skb;
+       struct sk_buff *skb, *mskb;
        struct mgmt_hdr *hdr;
        struct mgmt_ev_cmd_complete *ev;
        int err;
@@ -114,10 +160,24 @@ int mgmt_cmd_complete(struct sock *sk, u16 index, u16 cmd, u8 status,
        if (rp)
                memcpy(ev->data, rp, rp_len);
 
+       mskb = create_monitor_ctrl_event(hdr->index, hci_sock_get_cookie(sk),
+                                        MGMT_EV_CMD_COMPLETE,
+                                        sizeof(*ev) + rp_len, ev);
+       if (mskb)
+               skb->tstamp = mskb->tstamp;
+       else
+               __net_timestamp(skb);
+
        err = sock_queue_rcv_skb(sk, skb);
        if (err < 0)
                kfree_skb(skb);
 
+       if (mskb) {
+               hci_send_to_channel(HCI_CHANNEL_MONITOR, mskb,
+                                   HCI_SOCK_TRUSTED, NULL);
+               kfree_skb(mskb);
+       }
+
        return err;
 }