From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/bluetooth/h4_recv.h | 146 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 146 insertions(+) create mode 100644 drivers/bluetooth/h4_recv.h (limited to 'drivers/bluetooth/h4_recv.h') diff --git a/drivers/bluetooth/h4_recv.h b/drivers/bluetooth/h4_recv.h new file mode 100644 index 000000000..4f2c89742 --- /dev/null +++ b/drivers/bluetooth/h4_recv.h @@ -0,0 +1,146 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * + * Generic Bluetooth HCI UART driver + * + * Copyright (C) 2015-2018 Intel Corporation + */ + +#include + +struct h4_recv_pkt { + u8 type; /* Packet type */ + u8 hlen; /* Header length */ + u8 loff; /* Data length offset in header */ + u8 lsize; /* Data length field size */ + u16 maxlen; /* Max overall packet length */ + int (*recv)(struct hci_dev *hdev, struct sk_buff *skb); +}; + +#define H4_RECV_ACL \ + .type = HCI_ACLDATA_PKT, \ + .hlen = HCI_ACL_HDR_SIZE, \ + .loff = 2, \ + .lsize = 2, \ + .maxlen = HCI_MAX_FRAME_SIZE \ + +#define H4_RECV_SCO \ + .type = HCI_SCODATA_PKT, \ + .hlen = HCI_SCO_HDR_SIZE, \ + .loff = 2, \ + .lsize = 1, \ + .maxlen = HCI_MAX_SCO_SIZE + +#define H4_RECV_EVENT \ + .type = HCI_EVENT_PKT, \ + .hlen = HCI_EVENT_HDR_SIZE, \ + .loff = 1, \ + .lsize = 1, \ + .maxlen = HCI_MAX_EVENT_SIZE + +static inline struct sk_buff *h4_recv_buf(struct hci_dev *hdev, + struct sk_buff *skb, + const unsigned char *buffer, + int count, + const struct h4_recv_pkt *pkts, + int pkts_count) +{ + /* Check for error from previous call */ + if (IS_ERR(skb)) + skb = NULL; + + while (count) { + int i, len; + + if (!skb) { + for (i = 0; i < pkts_count; i++) { + if (buffer[0] != (&pkts[i])->type) + continue; + + skb = bt_skb_alloc((&pkts[i])->maxlen, + GFP_ATOMIC); + if (!skb) + return ERR_PTR(-ENOMEM); + + hci_skb_pkt_type(skb) = (&pkts[i])->type; + hci_skb_expect(skb) = (&pkts[i])->hlen; + break; + } + + /* Check for invalid packet type */ + if (!skb) + return ERR_PTR(-EILSEQ); + + count -= 1; + buffer += 1; + } + + len = min_t(uint, hci_skb_expect(skb) - skb->len, count); + skb_put_data(skb, buffer, len); + + count -= len; + buffer += len; + + /* Check for partial packet */ + if (skb->len < hci_skb_expect(skb)) + continue; + + for (i = 0; i < pkts_count; i++) { + if (hci_skb_pkt_type(skb) == (&pkts[i])->type) + break; + } + + if (i >= pkts_count) { + kfree_skb(skb); + return ERR_PTR(-EILSEQ); + } + + if (skb->len == (&pkts[i])->hlen) { + u16 dlen; + + switch ((&pkts[i])->lsize) { + case 0: + /* No variable data length */ + dlen = 0; + break; + case 1: + /* Single octet variable length */ + dlen = skb->data[(&pkts[i])->loff]; + hci_skb_expect(skb) += dlen; + + if (skb_tailroom(skb) < dlen) { + kfree_skb(skb); + return ERR_PTR(-EMSGSIZE); + } + break; + case 2: + /* Double octet variable length */ + dlen = get_unaligned_le16(skb->data + + (&pkts[i])->loff); + hci_skb_expect(skb) += dlen; + + if (skb_tailroom(skb) < dlen) { + kfree_skb(skb); + return ERR_PTR(-EMSGSIZE); + } + break; + default: + /* Unsupported variable length */ + kfree_skb(skb); + return ERR_PTR(-EILSEQ); + } + + if (!dlen) { + /* No more data, complete frame */ + (&pkts[i])->recv(hdev, skb); + skb = NULL; + } + } else { + /* Complete frame */ + (&pkts[i])->recv(hdev, skb); + skb = NULL; + } + } + + return skb; +} -- cgit v1.2.3