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| 1 | +// SPDX-License-Identifier: GPL-2.0 |
| 2 | + |
| 3 | +/* Copyright (C) 2021 Intel Corporation */ |
| 4 | + |
| 5 | +#include <net/bluetooth/bluetooth.h> |
| 6 | +#include <net/bluetooth/hci_core.h> |
| 7 | +#include "hci_codec.h" |
| 8 | + |
| 9 | +static int hci_codec_list_add(struct list_head *list, |
| 10 | + struct hci_op_read_local_codec_caps *sent, |
| 11 | + struct hci_rp_read_local_codec_caps *rp, |
| 12 | + void *caps, |
| 13 | + __u32 len) |
| 14 | +{ |
| 15 | + struct codec_list *entry; |
| 16 | + |
| 17 | + entry = kzalloc(sizeof(*entry) + len, GFP_KERNEL); |
| 18 | + if (!entry) |
| 19 | + return -ENOMEM; |
| 20 | + |
| 21 | + entry->id = sent->id; |
| 22 | + if (sent->id == 0xFF) { |
| 23 | + entry->cid = __le16_to_cpu(sent->cid); |
| 24 | + entry->vid = __le16_to_cpu(sent->vid); |
| 25 | + } |
| 26 | + entry->transport = sent->transport; |
| 27 | + entry->len = len; |
| 28 | + entry->num_caps = rp->num_caps; |
| 29 | + if (rp->num_caps) |
| 30 | + memcpy(entry->caps, caps, len); |
| 31 | + list_add(&entry->list, list); |
| 32 | + |
| 33 | + return 0; |
| 34 | +} |
| 35 | + |
| 36 | +void hci_codec_list_clear(struct list_head *codec_list) |
| 37 | +{ |
| 38 | + struct codec_list *c, *n; |
| 39 | + |
| 40 | + list_for_each_entry_safe(c, n, codec_list, list) { |
| 41 | + list_del(&c->list); |
| 42 | + kfree(c); |
| 43 | + } |
| 44 | +} |
| 45 | + |
| 46 | +static void hci_read_codec_capabilities(struct hci_dev *hdev, __u8 transport, |
| 47 | + struct hci_op_read_local_codec_caps |
| 48 | + *cmd) |
| 49 | +{ |
| 50 | + __u8 i; |
| 51 | + |
| 52 | + for (i = 0; i < TRANSPORT_TYPE_MAX; i++) { |
| 53 | + if (transport & BIT(i)) { |
| 54 | + struct hci_rp_read_local_codec_caps *rp; |
| 55 | + struct hci_codec_caps *caps; |
| 56 | + struct sk_buff *skb; |
| 57 | + __u8 j; |
| 58 | + __u32 len; |
| 59 | + |
| 60 | + cmd->transport = i; |
| 61 | + skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODEC_CAPS, |
| 62 | + sizeof(*cmd), cmd, |
| 63 | + HCI_CMD_TIMEOUT); |
| 64 | + if (IS_ERR(skb)) { |
| 65 | + bt_dev_err(hdev, "Failed to read codec capabilities (%ld)", |
| 66 | + PTR_ERR(skb)); |
| 67 | + continue; |
| 68 | + } |
| 69 | + |
| 70 | + if (skb->len < sizeof(*rp)) |
| 71 | + goto error; |
| 72 | + |
| 73 | + rp = (void *)skb->data; |
| 74 | + |
| 75 | + if (rp->status) |
| 76 | + goto error; |
| 77 | + |
| 78 | + if (!rp->num_caps) { |
| 79 | + len = 0; |
| 80 | + /* this codec doesn't have capabilities */ |
| 81 | + goto skip_caps_parse; |
| 82 | + } |
| 83 | + |
| 84 | + skb_pull(skb, sizeof(*rp)); |
| 85 | + |
| 86 | + for (j = 0, len = 0; j < rp->num_caps; j++) { |
| 87 | + caps = (void *)skb->data; |
| 88 | + if (skb->len < sizeof(*caps)) |
| 89 | + goto error; |
| 90 | + if (skb->len < caps->len) |
| 91 | + goto error; |
| 92 | + len += sizeof(caps->len) + caps->len; |
| 93 | + skb_pull(skb, sizeof(caps->len) + caps->len); |
| 94 | + } |
| 95 | + |
| 96 | +skip_caps_parse: |
| 97 | + hci_dev_lock(hdev); |
| 98 | + hci_codec_list_add(&hdev->local_codecs, cmd, rp, |
| 99 | + (__u8 *)rp + sizeof(*rp), len); |
| 100 | + hci_dev_unlock(hdev); |
| 101 | +error: |
| 102 | + kfree_skb(skb); |
| 103 | + } |
| 104 | + } |
| 105 | +} |
| 106 | + |
| 107 | +void hci_read_supported_codecs(struct hci_dev *hdev) |
| 108 | +{ |
| 109 | + struct sk_buff *skb; |
| 110 | + struct hci_rp_read_local_supported_codecs *rp; |
| 111 | + struct hci_std_codecs *std_codecs; |
| 112 | + struct hci_vnd_codecs *vnd_codecs; |
| 113 | + struct hci_op_read_local_codec_caps caps; |
| 114 | + __u8 i; |
| 115 | + |
| 116 | + skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODECS, 0, NULL, |
| 117 | + HCI_CMD_TIMEOUT); |
| 118 | + |
| 119 | + if (IS_ERR(skb)) { |
| 120 | + bt_dev_err(hdev, "Failed to read local supported codecs (%ld)", |
| 121 | + PTR_ERR(skb)); |
| 122 | + return; |
| 123 | + } |
| 124 | + |
| 125 | + if (skb->len < sizeof(*rp)) |
| 126 | + goto error; |
| 127 | + |
| 128 | + rp = (void *)skb->data; |
| 129 | + |
| 130 | + if (rp->status) |
| 131 | + goto error; |
| 132 | + |
| 133 | + skb_pull(skb, sizeof(rp->status)); |
| 134 | + |
| 135 | + std_codecs = (void *)skb->data; |
| 136 | + |
| 137 | + /* validate codecs length before accessing */ |
| 138 | + if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num) |
| 139 | + + sizeof(std_codecs->num)) |
| 140 | + goto error; |
| 141 | + |
| 142 | + /* enumerate codec capabilities of standard codecs */ |
| 143 | + memset(&caps, 0, sizeof(caps)); |
| 144 | + for (i = 0; i < std_codecs->num; i++) { |
| 145 | + caps.id = std_codecs->codec[i]; |
| 146 | + caps.direction = 0x00; |
| 147 | + hci_read_codec_capabilities(hdev, LOCAL_CODEC_ACL_MASK, &caps); |
| 148 | + } |
| 149 | + |
| 150 | + skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num) |
| 151 | + + sizeof(std_codecs->num)); |
| 152 | + |
| 153 | + vnd_codecs = (void *)skb->data; |
| 154 | + |
| 155 | + /* validate vendor codecs length before accessing */ |
| 156 | + if (skb->len < |
| 157 | + flex_array_size(vnd_codecs, codec, vnd_codecs->num) |
| 158 | + + sizeof(vnd_codecs->num)) |
| 159 | + goto error; |
| 160 | + |
| 161 | + /* enumerate vendor codec capabilities */ |
| 162 | + for (i = 0; i < vnd_codecs->num; i++) { |
| 163 | + caps.id = 0xFF; |
| 164 | + caps.cid = vnd_codecs->codec[i].cid; |
| 165 | + caps.vid = vnd_codecs->codec[i].vid; |
| 166 | + caps.direction = 0x00; |
| 167 | + hci_read_codec_capabilities(hdev, LOCAL_CODEC_ACL_MASK, &caps); |
| 168 | + } |
| 169 | + |
| 170 | +error: |
| 171 | + kfree_skb(skb); |
| 172 | +} |
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