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Bluetooth: Implement hci_reassembly helper to reassemble RX packets

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Implements feature to reassemble received HCI frames from any input stream

Signed-off-by: Suraj Sumangala <suraj@atheros.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Suraj Sumangala 2010-07-14 13:02:17 +05:30 committed by Marcel Holtmann
parent cd4c53919e
commit 33e882a5f2
2 changed files with 110 additions and 0 deletions
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1
include/net/bluetooth/bluetooth.h
View File

@ -138,6 +138,7 @@ struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock);
struct bt_skb_cb {
__u8 pkt_type;
__u8 incoming;
__u16 expect;
__u8 tx_seq;
__u8 retries;
__u8 sar;

109
net/bluetooth/hci_core.c
View File

@ -1033,6 +1033,115 @@ int hci_recv_frame(struct sk_buff *skb)
}
EXPORT_SYMBOL(hci_recv_frame);
static int hci_reassembly(struct hci_dev *hdev, int type, void *data,
int count, __u8 index, gfp_t gfp_mask)
{
int len = 0;
int hlen = 0;
int remain = count;
struct sk_buff *skb;
struct bt_skb_cb *scb;
if ((type < HCI_ACLDATA_PKT || type > HCI_EVENT_PKT) ||
index >= NUM_REASSEMBLY)
return -EILSEQ;
skb = hdev->reassembly[index];
if (!skb) {
switch (type) {
case HCI_ACLDATA_PKT:
len = HCI_MAX_FRAME_SIZE;
hlen = HCI_ACL_HDR_SIZE;
break;
case HCI_EVENT_PKT:
len = HCI_MAX_EVENT_SIZE;
hlen = HCI_EVENT_HDR_SIZE;
break;
case HCI_SCODATA_PKT:
len = HCI_MAX_SCO_SIZE;
hlen = HCI_SCO_HDR_SIZE;
break;
}
skb = bt_skb_alloc(len, gfp_mask);
if (!skb)
return -ENOMEM;
scb = (void *) skb->cb;
scb->expect = hlen;
scb->pkt_type = type;
skb->dev = (void *) hdev;
hdev->reassembly[index] = skb;
}
while (count) {
scb = (void *) skb->cb;
len = min(scb->expect, (__u16)count);
memcpy(skb_put(skb, len), data, len);
count -= len;
data += len;
scb->expect -= len;
remain = count;
switch (type) {
case HCI_EVENT_PKT:
if (skb->len == HCI_EVENT_HDR_SIZE) {
struct hci_event_hdr *h = hci_event_hdr(skb);
scb->expect = h->plen;
if (skb_tailroom(skb) < scb->expect) {
kfree_skb(skb);
hdev->reassembly[index] = NULL;
return -ENOMEM;
}
}
break;
case HCI_ACLDATA_PKT:
if (skb->len == HCI_ACL_HDR_SIZE) {
struct hci_acl_hdr *h = hci_acl_hdr(skb);
scb->expect = __le16_to_cpu(h->dlen);
if (skb_tailroom(skb) < scb->expect) {
kfree_skb(skb);
hdev->reassembly[index] = NULL;
return -ENOMEM;
}
}
break;
case HCI_SCODATA_PKT:
if (skb->len == HCI_SCO_HDR_SIZE) {
struct hci_sco_hdr *h = hci_sco_hdr(skb);
scb->expect = h->dlen;
if (skb_tailroom(skb) < scb->expect) {
kfree_skb(skb);
hdev->reassembly[index] = NULL;
return -ENOMEM;
}
}
break;
}
if (scb->expect == 0) {
/* Complete frame */
bt_cb(skb)->pkt_type = type;
hci_recv_frame(skb);
hdev->reassembly[index] = NULL;
return remain;
}
}
return remain;
}
/* Receive packet type fragment */
#define __reassembly(hdev, type) ((hdev)->reassembly[(type) - 1])