net/bluetooth/hci_codec.c

0001 // SPDX-License-Identifier: GPL-2.0
0002
0003 /* Copyright (C) 2021 Intel Corporation */
0004
0005 #include <net/bluetooth/bluetooth.h>
0006 #include <net/bluetooth/hci_core.h>
0007 #include "hci_codec.h"
0008
0009 static int hci_codec_list_add(struct list_head *list,
0010                   struct hci_op_read_local_codec_caps *sent,
0011                   struct hci_rp_read_local_codec_caps *rp,
0012                   void *caps,
0013                   __u32 len)
0014 {
0015     struct codec_list *entry;
0016
0017     entry = kzalloc(sizeof(*entry) + len, GFP_KERNEL);
0018     if (!entry)
0019         return -ENOMEM;
0020
0021     entry->id = sent->id;
0022     if (sent->id == 0xFF) {
0023         entry->cid = __le16_to_cpu(sent->cid);
0024         entry->vid = __le16_to_cpu(sent->vid);
0025     }
0026     entry->transport = sent->transport;
0027     entry->len = len;
0028     entry->num_caps = 0;
0029     if (rp) {
0030         entry->num_caps = rp->num_caps;
0031         memcpy(entry->caps, caps, len);
0032     }
0033     list_add(&entry->list, list);
0034
0035     return 0;
0036 }
0037
0038 void hci_codec_list_clear(struct list_head *codec_list)
0039 {
0040     struct codec_list *c, *n;
0041
0042     list_for_each_entry_safe(c, n, codec_list, list) {
0043         list_del(&c->list);
0044         kfree(c);
0045     }
0046 }
0047
0048 static void hci_read_codec_capabilities(struct hci_dev *hdev, __u8 transport,
0049                     struct hci_op_read_local_codec_caps
0050                     *cmd)
0051 {
0052     __u8 i;
0053
0054     for (i = 0; i < TRANSPORT_TYPE_MAX; i++) {
0055         if (transport & BIT(i)) {
0056             struct hci_rp_read_local_codec_caps *rp;
0057             struct hci_codec_caps *caps;
0058             struct sk_buff *skb;
0059             __u8 j;
0060             __u32 len;
0061
0062             cmd->transport = i;
0063
0064             /* If Read_Codec_Capabilities command is not supported
0065              * then just add codec to the list without caps
0066              */
0067             if (!(hdev->commands[45] & 0x08)) {
0068                 hci_dev_lock(hdev);
0069                 hci_codec_list_add(&hdev->local_codecs, cmd,
0070                            NULL, NULL, 0);
0071                 hci_dev_unlock(hdev);
0072                 continue;
0073             }
0074
0075             skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODEC_CAPS,
0076                          sizeof(*cmd), cmd,
0077                          HCI_CMD_TIMEOUT);
0078             if (IS_ERR(skb)) {
0079                 bt_dev_err(hdev, "Failed to read codec capabilities (%ld)",
0080                        PTR_ERR(skb));
0081                 continue;
0082             }
0083
0084             if (skb->len < sizeof(*rp))
0085                 goto error;
0086
0087             rp = (void *)skb->data;
0088
0089             if (rp->status)
0090                 goto error;
0091
0092             if (!rp->num_caps) {
0093                 len = 0;
0094                 /* this codec doesn't have capabilities */
0095                 goto skip_caps_parse;
0096             }
0097
0098             skb_pull(skb, sizeof(*rp));
0099
0100             for (j = 0, len = 0; j < rp->num_caps; j++) {
0101                 caps = (void *)skb->data;
0102                 if (skb->len < sizeof(*caps))
0103                     goto error;
0104                 if (skb->len < caps->len)
0105                     goto error;
0106                 len += sizeof(caps->len) + caps->len;
0107                 skb_pull(skb,  sizeof(caps->len) + caps->len);
0108             }
0109
0110 skip_caps_parse:
0111             hci_dev_lock(hdev);
0112             hci_codec_list_add(&hdev->local_codecs, cmd, rp,
0113                        (__u8 *)rp + sizeof(*rp), len);
0114             hci_dev_unlock(hdev);
0115 error:
0116             kfree_skb(skb);
0117         }
0118     }
0119 }
0120
0121 void hci_read_supported_codecs(struct hci_dev *hdev)
0122 {
0123     struct sk_buff *skb;
0124     struct hci_rp_read_local_supported_codecs *rp;
0125     struct hci_std_codecs *std_codecs;
0126     struct hci_vnd_codecs *vnd_codecs;
0127     struct hci_op_read_local_codec_caps caps;
0128     __u8 i;
0129
0130     skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODECS, 0, NULL,
0131                  HCI_CMD_TIMEOUT);
0132
0133     if (IS_ERR(skb)) {
0134         bt_dev_err(hdev, "Failed to read local supported codecs (%ld)",
0135                PTR_ERR(skb));
0136         return;
0137     }
0138
0139     if (skb->len < sizeof(*rp))
0140         goto error;
0141
0142     rp = (void *)skb->data;
0143
0144     if (rp->status)
0145         goto error;
0146
0147     skb_pull(skb, sizeof(rp->status));
0148
0149     std_codecs = (void *)skb->data;
0150
0151     /* validate codecs length before accessing */
0152     if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num)
0153         + sizeof(std_codecs->num))
0154         goto error;
0155
0156     /* enumerate codec capabilities of standard codecs */
0157     memset(&caps, 0, sizeof(caps));
0158     for (i = 0; i < std_codecs->num; i++) {
0159         caps.id = std_codecs->codec[i];
0160         caps.direction = 0x00;
0161         hci_read_codec_capabilities(hdev, LOCAL_CODEC_ACL_MASK, &caps);
0162     }
0163
0164     skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num)
0165          + sizeof(std_codecs->num));
0166
0167     vnd_codecs = (void *)skb->data;
0168
0169     /* validate vendor codecs length before accessing */
0170     if (skb->len <
0171         flex_array_size(vnd_codecs, codec, vnd_codecs->num)
0172         + sizeof(vnd_codecs->num))
0173         goto error;
0174
0175     /* enumerate vendor codec capabilities */
0176     for (i = 0; i < vnd_codecs->num; i++) {
0177         caps.id = 0xFF;
0178         caps.cid = vnd_codecs->codec[i].cid;
0179         caps.vid = vnd_codecs->codec[i].vid;
0180         caps.direction = 0x00;
0181         hci_read_codec_capabilities(hdev, LOCAL_CODEC_ACL_MASK, &caps);
0182     }
0183
0184 error:
0185     kfree_skb(skb);
0186 }
0187
0188 void hci_read_supported_codecs_v2(struct hci_dev *hdev)
0189 {
0190     struct sk_buff *skb;
0191     struct hci_rp_read_local_supported_codecs_v2 *rp;
0192     struct hci_std_codecs_v2 *std_codecs;
0193     struct hci_vnd_codecs_v2 *vnd_codecs;
0194     struct hci_op_read_local_codec_caps caps;
0195     __u8 i;
0196
0197     skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODECS_V2, 0, NULL,
0198                  HCI_CMD_TIMEOUT);
0199
0200     if (IS_ERR(skb)) {
0201         bt_dev_err(hdev, "Failed to read local supported codecs (%ld)",
0202                PTR_ERR(skb));
0203         return;
0204     }
0205
0206     if (skb->len < sizeof(*rp))
0207         goto error;
0208
0209     rp = (void *)skb->data;
0210
0211     if (rp->status)
0212         goto error;
0213
0214     skb_pull(skb, sizeof(rp->status));
0215
0216     std_codecs = (void *)skb->data;
0217
0218     /* check for payload data length before accessing */
0219     if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num)
0220         + sizeof(std_codecs->num))
0221         goto error;
0222
0223     memset(&caps, 0, sizeof(caps));
0224
0225     for (i = 0; i < std_codecs->num; i++) {
0226         caps.id = std_codecs->codec[i].id;
0227         hci_read_codec_capabilities(hdev, std_codecs->codec[i].transport,
0228                         &caps);
0229     }
0230
0231     skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num)
0232          + sizeof(std_codecs->num));
0233
0234     vnd_codecs = (void *)skb->data;
0235
0236     /* check for payload data length before accessing */
0237     if (skb->len <
0238         flex_array_size(vnd_codecs, codec, vnd_codecs->num)
0239         + sizeof(vnd_codecs->num))
0240         goto error;
0241
0242     for (i = 0; i < vnd_codecs->num; i++) {
0243         caps.id = 0xFF;
0244         caps.cid = vnd_codecs->codec[i].cid;
0245         caps.vid = vnd_codecs->codec[i].vid;
0246         hci_read_codec_capabilities(hdev, vnd_codecs->codec[i].transport,
0247                         &caps);
0248     }
0249
0250 error:
0251     kfree_skb(skb);
0252 }