1 // Copyright 2024 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14
15 #include "pw_bluetooth_proxy/proxy_host.h"
16
17 #include "emboss_util.h"
18 #include "pw_assert/check.h" // IWYU pragma: keep
19 #include "pw_bluetooth/hci_common.emb.h"
20 #include "pw_bluetooth/hci_h4.emb.h"
21 #include "pw_bluetooth_proxy/common.h"
22 #include "pw_log/log.h"
23
24 namespace pw::bluetooth::proxy {
25
ProxyHost(H4HciPacketSendFn && send_to_host_fn,H4HciPacketSendFn && send_to_controller_fn,uint16_t le_acl_credits_to_reserve)26 ProxyHost::ProxyHost(H4HciPacketSendFn&& send_to_host_fn,
27 H4HciPacketSendFn&& send_to_controller_fn,
28 uint16_t le_acl_credits_to_reserve)
29 : outward_send_to_host_fn_(std::move(send_to_host_fn)),
30 outward_send_to_controller_fn_(std::move(send_to_controller_fn)),
31 acl_data_channel_{le_acl_credits_to_reserve} {}
32
HandleH4HciFromHost(H4HciPacket h4_packet)33 void ProxyHost::HandleH4HciFromHost(H4HciPacket h4_packet) {
34 SendToController(h4_packet);
35 }
36
ProcessH4HciFromController(H4HciPacket h4_packet)37 void ProxyHost::ProcessH4HciFromController(H4HciPacket h4_packet) {
38 if (h4_packet.hci_span.empty()) {
39 PW_LOG_ERROR("Received empty H4 buffer. So will not process.");
40 return;
41 }
42
43 if (h4_packet.h4_type != emboss::H4PacketType::EVENT) {
44 return;
45 }
46 pw::span hci_buffer = h4_packet.hci_span;
47 auto event = MakeEmboss<emboss::EventHeaderView>(hci_buffer);
48 if (!event.IsComplete()) {
49 PW_LOG_ERROR("Buffer is too small for EventHeader. So will not process.");
50 return;
51 }
52
53 if (event.event_code_enum().Read() != emboss::EventCode::COMMAND_COMPLETE) {
54 return;
55 }
56 auto command_complete_event =
57 MakeEmboss<emboss::CommandCompleteEventView>(hci_buffer);
58 if (!command_complete_event.IsComplete()) {
59 PW_LOG_ERROR(
60 "Buffer is too small for COMMAND_COMPLETE event. So will not process.");
61 return;
62 }
63
64 PW_MODIFY_DIAGNOSTICS_PUSH();
65 PW_MODIFY_DIAGNOSTIC(ignored, "-Wswitch-enum");
66 switch (command_complete_event.command_opcode_enum().Read()) {
67 case emboss::OpCode::LE_READ_BUFFER_SIZE_V1: {
68 auto read_event =
69 MakeEmboss<emboss::LEReadBufferSizeV1CommandCompleteEventWriter>(
70 hci_buffer);
71 if (!read_event.IsComplete()) {
72 PW_LOG_ERROR(
73 "Buffer is too small for LE_READ_BUFFER_SIZE_V1 command complete "
74 "event. So will not process.");
75 return;
76 }
77 acl_data_channel_.ProcessLEReadBufferSizeCommandCompleteEvent(read_event);
78 break;
79 }
80 case emboss::OpCode::LE_READ_BUFFER_SIZE_V2: {
81 auto read_event =
82 MakeEmboss<emboss::LEReadBufferSizeV2CommandCompleteEventWriter>(
83 hci_buffer);
84 if (!read_event.IsComplete()) {
85 PW_LOG_ERROR(
86 "Buffer is too small for LE_READ_BUFFER_SIZE_V2 command complete "
87 "event. So will not process.");
88 return;
89 }
90 acl_data_channel_.ProcessLEReadBufferSizeCommandCompleteEvent(read_event);
91 break;
92 }
93 default:
94 // Nothing to process
95 break;
96 }
97 PW_MODIFY_DIAGNOSTICS_POP();
98 }
99
HandleH4HciFromController(H4HciPacket h4_packet)100 void ProxyHost::HandleH4HciFromController(H4HciPacket h4_packet) {
101 ProcessH4HciFromController(h4_packet);
102 SendToHost(h4_packet);
103 }
104
SendToHost(H4HciPacket h4_packet)105 void ProxyHost::SendToHost(H4HciPacket h4_packet) {
106 PW_DCHECK(outward_send_to_host_fn_ != nullptr);
107 outward_send_to_host_fn_(h4_packet);
108 }
109
SendToController(H4HciPacket h4_packet)110 void ProxyHost::SendToController(H4HciPacket h4_packet) {
111 PW_DCHECK(outward_send_to_controller_fn_ != nullptr);
112 outward_send_to_controller_fn_(h4_packet);
113 }
114
HasSendAclCapability() const115 bool ProxyHost::HasSendAclCapability() const {
116 return acl_data_channel_.GetLeAclCreditsToReserve() > 0;
117 }
118
GetNumFreeLeAclPackets() const119 uint16_t ProxyHost::GetNumFreeLeAclPackets() const {
120 return acl_data_channel_.GetNumFreeLeAclPackets();
121 }
122
123 } // namespace pw::bluetooth::proxy
124