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Bluetooth: mgmt: Make use of mgmt_send_event_skb in MGMT_EV_DEVICE_FOUND 

This makes use of mgmt_alloc_skb to build MGMT_EV_DEVICE_FOUND so the
data is copied directly to skb that is then sent using
mgmt_send_event_skb eliminating the necessity of intermediary buffers.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Luiz Augusto von Dentz 2021-12-03 16:15:41 -08:00
parent 8aca46f91c
commit cf1bce1de7
1 changed files with 31 additions and 21 deletions
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50
net/bluetooth/mgmt.c
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@ -335,6 +335,12 @@ static int mgmt_event(u16 event, struct hci_dev *hdev, void *data, u16 len,
HCI_SOCK_TRUSTED, skip_sk);
}
static int mgmt_event_skb(struct sk_buff *skb, struct sock *skip_sk)
{
return mgmt_send_event_skb(HCI_CHANNEL_CONTROL, skb, HCI_SOCK_TRUSTED,
skip_sk);
}
static u8 le_addr_type(u8 mgmt_addr_type)
{
if (mgmt_addr_type == BDADDR_LE_PUBLIC)
@ -9550,9 +9556,8 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
u8 addr_type, u8 *dev_class, s8 rssi, u32 flags,
u8 *eir, u16 eir_len, u8 *scan_rsp, u8 scan_rsp_len)
{
char buf[512];
struct mgmt_ev_device_found *ev = (void *)buf;
size_t ev_size;
struct sk_buff *skb;
struct mgmt_ev_device_found *ev;
/* Don't send events for a non-kernel initiated discovery. With
* LE one exception is if we have pend_le_reports > 0 in which
@ -9587,13 +9592,13 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
}
}
/* Make sure that the buffer is big enough. The 5 extra bytes
* are for the potential CoD field.
*/
if (sizeof(*ev) + eir_len + scan_rsp_len + 5 > sizeof(buf))
/* Allocate skb. The 5 extra bytes are for the potential CoD field */
skb = mgmt_alloc_skb(hdev, MGMT_EV_DEVICE_FOUND,
sizeof(*ev) + eir_len + scan_rsp_len + 5);
if (!skb)
return;
memset(buf, 0, sizeof(buf));
ev = skb_put(skb, sizeof(*ev));
/* In case of device discovery with BR/EDR devices (pre 1.2), the
* RSSI value was reported as 0 when not available. This behavior
@ -9614,35 +9619,39 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
if (eir_len > 0)
/* Copy EIR or advertising data into event */
memcpy(ev->eir, eir, eir_len);
skb_put_data(skb, eir, eir_len);
if (dev_class && !eir_get_data(ev->eir, eir_len, EIR_CLASS_OF_DEV,
NULL))
eir_len = eir_append_data(ev->eir, eir_len, EIR_CLASS_OF_DEV,
if (dev_class && !eir_get_data(eir, eir_len, EIR_CLASS_OF_DEV, NULL)) {
u8 eir_cod[5];
eir_len += eir_append_data(eir_cod, 0, EIR_CLASS_OF_DEV,
dev_class, 3);
skb_put_data(skb, eir_cod, sizeof(eir_cod));
}
if (scan_rsp_len > 0)
/* Append scan response data to event */
memcpy(ev->eir + eir_len, scan_rsp, scan_rsp_len);
skb_put_data(skb, scan_rsp, scan_rsp_len);
ev->eir_len = cpu_to_le16(eir_len + scan_rsp_len);
ev_size = sizeof(*ev) + eir_len + scan_rsp_len;
mgmt_event(MGMT_EV_DEVICE_FOUND, hdev, ev, ev_size, NULL);
mgmt_event_skb(skb, NULL);
}
void mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
u8 addr_type, s8 rssi, u8 *name, u8 name_len)
{
struct sk_buff *skb;
struct mgmt_ev_device_found *ev;
char buf[sizeof(*ev) + HCI_MAX_NAME_LENGTH + 2];
u16 eir_len;
u32 flags;
ev = (struct mgmt_ev_device_found *) buf;
memset(buf, 0, sizeof(buf));
if (name_len)
skb = mgmt_alloc_skb(hdev, MGMT_EV_DEVICE_FOUND, 2 + name_len);
else
skb = mgmt_alloc_skb(hdev, MGMT_EV_DEVICE_FOUND, 0);
ev = skb_put(skb, sizeof(*ev));
bacpy(&ev->addr.bdaddr, bdaddr);
ev->addr.type = link_to_bdaddr(link_type, addr_type);
ev->rssi = rssi;
@ -9651,6 +9660,7 @@ void mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
eir_len = eir_append_data(ev->eir, 0, EIR_NAME_COMPLETE, name,
name_len);
flags = 0;
skb_put(skb, eir_len);
} else {
eir_len = 0;
flags = MGMT_DEV_FOUND_NAME_REQUEST_FAILED;
@ -9659,7 +9669,7 @@ void mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
ev->eir_len = cpu_to_le16(eir_len);
ev->flags = cpu_to_le32(flags);
mgmt_event(MGMT_EV_DEVICE_FOUND, hdev, ev, sizeof(*ev) + eir_len, NULL);
mgmt_event_skb(skb, NULL);
}
void mgmt_discovering(struct hci_dev *hdev, u8 discovering)