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146 lines
2.9 KiB
146 lines
2.9 KiB
/* 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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