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authorSuraj Sumangala <suraj@atheros.com>2010-07-14 13:02:17 +0530
committerMarcel Holtmann <marcel@holtmann.org>2010-07-21 10:39:12 -0700
commit33e882a5f2301a23a85ef2994e30fd9f48d39d9b (patch)
tree4048a954d11698581e123b25389a9f8f72125f90 /net/bluetooth
parentcd4c53919ed50b0d532f106aeb76e79077bece98 (diff)
Bluetooth: Implement hci_reassembly helper to reassemble RX packets
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>
Diffstat (limited to 'net/bluetooth')
-rw-r--r--net/bluetooth/hci_core.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 0ded790bfb67..477c4a60a079 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -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])

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