Implements feature to reassemble received HCI frames from any input stream.
Signed-off-by: Suraj Sumangala <suraj@xxxxxxxxxxx>
---
net/bluetooth/hci_core.c | 115 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 115 insertions(+), 0 deletions(-)
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 5e83f8e..631a185 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1030,6 +1030,121 @@ 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, struct sk_buff **skb_ptr, int *remain)
+{
+ int len = 0;
+ int header_len = 0;
+ struct sk_buff *skb = *skb_ptr;
+ struct { __u8 pkt_type; int expect; } *scb;
+
+ *remain = count;
+
+ if (type < HCI_ACLDATA_PKT || type > HCI_EVENT_PKT)
+ return -EILSEQ;
+
+ if (!skb) {
+
+ switch (type) {
+ case HCI_ACLDATA_PKT:
+ len = HCI_MAX_FRAME_SIZE;
+ header_len = HCI_ACL_HDR_SIZE;
+ break;
+ case HCI_EVENT_PKT:
+ len = HCI_MAX_EVENT_SIZE;
+ header_len = HCI_EVENT_HDR_SIZE;
+ break;
+ case HCI_SCODATA_PKT:
+ len = HCI_MAX_SCO_SIZE;
+ header_len = HCI_SCO_HDR_SIZE;
+ break;
+ }
+
+ skb = bt_skb_alloc(len, GFP_ATOMIC);
+
+ if (!skb)
+ return -ENOMEM;
+
+ scb = (void *) skb->cb;
+ scb->expect = header_len;
+ scb->pkt_type = (__u8)type;
+
+ skb->dev = (void *) hdev;
+ *skb_ptr = skb;
+
+ }
+
+ while (count) {
+
+ scb = (void *) skb->cb;
+ len = min(scb->expect, 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);
+ *skb_ptr = 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);
+ *skb_ptr = 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);
+ *skb_ptr = NULL;
+
+ return -ENOMEM;
+ }
+ }
+ break;
+ }
+
+ if (scb->expect == 0) {
+
+ /* Complete frame */
+ bt_cb(skb)->pkt_type = type;
+ hci_recv_frame(skb);
+
+ *skb_ptr = NULL;
+
+ return 0;
+ }
+
+ }
+
+ return 0;
+}
/* Receive packet type fragment */
#define __reassembly(hdev, type) ((hdev)->reassembly[(type) - 2])
--
1.7.0
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