147 lines
2.9 KiB
C
147 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
*
|
|
* Generic Bluetooth HCI UART driver
|
|
*
|
|
* Copyright (C) 2015-2018 Intel Corporation
|
|
*/
|
|
|
|
#include <asm/unaligned.h>
|
|
|
|
struct h4_recv_pkt {
|
|
u8 type; /* Packet type */
|
|
u8 hlen; /* Header length */
|
|
u8 loff; /* Data length offset in header */
|
|
u8 lsize; /* Data length field size */
|
|
u16 maxlen; /* Max overall packet length */
|
|
int (*recv)(struct hci_dev *hdev, struct sk_buff *skb);
|
|
};
|
|
|
|
#define H4_RECV_ACL \
|
|
.type = HCI_ACLDATA_PKT, \
|
|
.hlen = HCI_ACL_HDR_SIZE, \
|
|
.loff = 2, \
|
|
.lsize = 2, \
|
|
.maxlen = HCI_MAX_FRAME_SIZE \
|
|
|
|
#define H4_RECV_SCO \
|
|
.type = HCI_SCODATA_PKT, \
|
|
.hlen = HCI_SCO_HDR_SIZE, \
|
|
.loff = 2, \
|
|
.lsize = 1, \
|
|
.maxlen = HCI_MAX_SCO_SIZE
|
|
|
|
#define H4_RECV_EVENT \
|
|
.type = HCI_EVENT_PKT, \
|
|
.hlen = HCI_EVENT_HDR_SIZE, \
|
|
.loff = 1, \
|
|
.lsize = 1, \
|
|
.maxlen = HCI_MAX_EVENT_SIZE
|
|
|
|
static inline struct sk_buff *h4_recv_buf(struct hci_dev *hdev,
|
|
struct sk_buff *skb,
|
|
const unsigned char *buffer,
|
|
int count,
|
|
const struct h4_recv_pkt *pkts,
|
|
int pkts_count)
|
|
{
|
|
/* Check for error from previous call */
|
|
if (IS_ERR(skb))
|
|
skb = NULL;
|
|
|
|
while (count) {
|
|
int i, len;
|
|
|
|
if (!skb) {
|
|
for (i = 0; i < pkts_count; i++) {
|
|
if (buffer[0] != (&pkts[i])->type)
|
|
continue;
|
|
|
|
skb = bt_skb_alloc((&pkts[i])->maxlen,
|
|
GFP_ATOMIC);
|
|
if (!skb)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
hci_skb_pkt_type(skb) = (&pkts[i])->type;
|
|
hci_skb_expect(skb) = (&pkts[i])->hlen;
|
|
break;
|
|
}
|
|
|
|
/* Check for invalid packet type */
|
|
if (!skb)
|
|
return ERR_PTR(-EILSEQ);
|
|
|
|
count -= 1;
|
|
buffer += 1;
|
|
}
|
|
|
|
len = min_t(uint, hci_skb_expect(skb) - skb->len, count);
|
|
skb_put_data(skb, buffer, len);
|
|
|
|
count -= len;
|
|
buffer += len;
|
|
|
|
/* Check for partial packet */
|
|
if (skb->len < hci_skb_expect(skb))
|
|
continue;
|
|
|
|
for (i = 0; i < pkts_count; i++) {
|
|
if (hci_skb_pkt_type(skb) == (&pkts[i])->type)
|
|
break;
|
|
}
|
|
|
|
if (i >= pkts_count) {
|
|
kfree_skb(skb);
|
|
return ERR_PTR(-EILSEQ);
|
|
}
|
|
|
|
if (skb->len == (&pkts[i])->hlen) {
|
|
u16 dlen;
|
|
|
|
switch ((&pkts[i])->lsize) {
|
|
case 0:
|
|
/* No variable data length */
|
|
dlen = 0;
|
|
break;
|
|
case 1:
|
|
/* Single octet variable length */
|
|
dlen = skb->data[(&pkts[i])->loff];
|
|
hci_skb_expect(skb) += dlen;
|
|
|
|
if (skb_tailroom(skb) < dlen) {
|
|
kfree_skb(skb);
|
|
return ERR_PTR(-EMSGSIZE);
|
|
}
|
|
break;
|
|
case 2:
|
|
/* Double octet variable length */
|
|
dlen = get_unaligned_le16(skb->data +
|
|
(&pkts[i])->loff);
|
|
hci_skb_expect(skb) += dlen;
|
|
|
|
if (skb_tailroom(skb) < dlen) {
|
|
kfree_skb(skb);
|
|
return ERR_PTR(-EMSGSIZE);
|
|
}
|
|
break;
|
|
default:
|
|
/* Unsupported variable length */
|
|
kfree_skb(skb);
|
|
return ERR_PTR(-EILSEQ);
|
|
}
|
|
|
|
if (!dlen) {
|
|
/* No more data, complete frame */
|
|
(&pkts[i])->recv(hdev, skb);
|
|
skb = NULL;
|
|
}
|
|
} else {
|
|
/* Complete frame */
|
|
(&pkts[i])->recv(hdev, skb);
|
|
skb = NULL;
|
|
}
|
|
}
|
|
|
|
return skb;
|
|
}
|