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