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1a59d1b8e0
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
147 lines
2.9 KiB
C
147 lines
2.9 KiB
C
/* 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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