1/******************************************************************************
2 *
3 *  Copyright (C) 1999-2012 Broadcom Corporation
4 *
5 *  Licensed under the Apache License, Version 2.0 (the "License");
6 *  you may not use this file except in compliance with the License.
7 *  You may obtain a copy of the License at:
8 *
9 *  http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 *
17 ******************************************************************************/
18
19/******************************************************************************
20 *
21 *  This file contains functions for the SMP L2Cap interface
22 *
23 ******************************************************************************/
24
25#include "bt_target.h"
26
27#include <string.h>
28#include "btm_ble_api.h"
29#include "l2c_api.h"
30
31#include "smp_int.h"
32
33extern fixed_queue_t* btu_general_alarm_queue;
34
35static void smp_tx_complete_callback(uint16_t cid, uint16_t num_pkt);
36
37static void smp_connect_callback(uint16_t channel, BD_ADDR bd_addr,
38                                 bool connected, uint16_t reason,
39                                 tBT_TRANSPORT transport);
40static void smp_data_received(uint16_t channel, BD_ADDR bd_addr, BT_HDR* p_buf);
41
42static void smp_br_connect_callback(uint16_t channel, BD_ADDR bd_addr,
43                                    bool connected, uint16_t reason,
44                                    tBT_TRANSPORT transport);
45static void smp_br_data_received(uint16_t channel, BD_ADDR bd_addr,
46                                 BT_HDR* p_buf);
47
48/*******************************************************************************
49 *
50 * Function         smp_l2cap_if_init
51 *
52 * Description      This function is called during the SMP task startup
53 *                  to register interface functions with L2CAP.
54 *
55 ******************************************************************************/
56void smp_l2cap_if_init(void) {
57  tL2CAP_FIXED_CHNL_REG fixed_reg;
58  SMP_TRACE_EVENT("SMDBG l2c %s", __func__);
59  fixed_reg.fixed_chnl_opts.mode = L2CAP_FCR_BASIC_MODE;
60  fixed_reg.fixed_chnl_opts.max_transmit = 0;
61  fixed_reg.fixed_chnl_opts.rtrans_tout = 0;
62  fixed_reg.fixed_chnl_opts.mon_tout = 0;
63  fixed_reg.fixed_chnl_opts.mps = 0;
64  fixed_reg.fixed_chnl_opts.tx_win_sz = 0;
65
66  fixed_reg.pL2CA_FixedConn_Cb = smp_connect_callback;
67  fixed_reg.pL2CA_FixedData_Cb = smp_data_received;
68  fixed_reg.pL2CA_FixedTxComplete_Cb = smp_tx_complete_callback;
69
70  fixed_reg.pL2CA_FixedCong_Cb =
71      NULL; /* do not handle congestion on this channel */
72  fixed_reg.default_idle_tout =
73      60; /* set 60 seconds timeout, 0xffff default idle timeout */
74
75  L2CA_RegisterFixedChannel(L2CAP_SMP_CID, &fixed_reg);
76
77  fixed_reg.pL2CA_FixedConn_Cb = smp_br_connect_callback;
78  fixed_reg.pL2CA_FixedData_Cb = smp_br_data_received;
79
80  L2CA_RegisterFixedChannel(L2CAP_SMP_BR_CID, &fixed_reg);
81}
82
83/*******************************************************************************
84 *
85 * Function         smp_connect_callback
86 *
87 * Description      This callback function is called by L2CAP to indicate that
88 *                  SMP channel is
89 *                      connected (conn = true)/disconnected (conn = false).
90 *
91 ******************************************************************************/
92static void smp_connect_callback(uint16_t channel, BD_ADDR bd_addr,
93                                 bool connected, uint16_t reason,
94                                 tBT_TRANSPORT transport) {
95  tSMP_CB* p_cb = &smp_cb;
96  tSMP_INT_DATA int_data;
97  BD_ADDR dummy_bda = {0};
98
99  SMP_TRACE_EVENT("SMDBG l2c %s", __func__);
100
101  if (transport == BT_TRANSPORT_BR_EDR ||
102      memcmp(bd_addr, dummy_bda, BD_ADDR_LEN) == 0)
103    return;
104
105  if (memcmp(bd_addr, p_cb->pairing_bda, BD_ADDR_LEN) == 0) {
106    SMP_TRACE_EVENT("%s()  for pairing BDA: %08x%04x  Event: %s", __func__,
107                    (bd_addr[0] << 24) + (bd_addr[1] << 16) +
108                        (bd_addr[2] << 8) + bd_addr[3],
109                    (bd_addr[4] << 8) + bd_addr[5],
110                    (connected) ? "connected" : "disconnected");
111
112    if (connected) {
113      if (!p_cb->connect_initialized) {
114        p_cb->connect_initialized = true;
115        /* initiating connection established */
116        p_cb->role = L2CA_GetBleConnRole(bd_addr);
117
118        /* initialize local i/r key to be default keys */
119        p_cb->local_r_key = p_cb->local_i_key = SMP_SEC_DEFAULT_KEY;
120        p_cb->loc_auth_req = p_cb->peer_auth_req = SMP_DEFAULT_AUTH_REQ;
121        p_cb->cb_evt = SMP_IO_CAP_REQ_EVT;
122        smp_sm_event(p_cb, SMP_L2CAP_CONN_EVT, NULL);
123      }
124    } else {
125      int_data.reason = reason;
126      /* Disconnected while doing security */
127      smp_sm_event(p_cb, SMP_L2CAP_DISCONN_EVT, &int_data);
128    }
129  }
130}
131
132/*******************************************************************************
133 *
134 * Function         smp_data_received
135 *
136 * Description      This function is called when data is received from L2CAP on
137 *                  SMP channel.
138 *
139 *
140 * Returns          void
141 *
142 ******************************************************************************/
143static void smp_data_received(uint16_t channel, BD_ADDR bd_addr,
144                              BT_HDR* p_buf) {
145  tSMP_CB* p_cb = &smp_cb;
146  uint8_t* p = (uint8_t*)(p_buf + 1) + p_buf->offset;
147  uint8_t cmd;
148  SMP_TRACE_EVENT("SMDBG l2c %s", __func__);
149
150  STREAM_TO_UINT8(cmd, p);
151
152  /* sanity check */
153  if ((SMP_OPCODE_MAX < cmd) || (SMP_OPCODE_MIN > cmd)) {
154    SMP_TRACE_WARNING("Ignore received command with RESERVED code 0x%02x", cmd);
155    osi_free(p_buf);
156    return;
157  }
158
159  /* reject the pairing request if there is an on-going SMP pairing */
160  if (SMP_OPCODE_PAIRING_REQ == cmd || SMP_OPCODE_SEC_REQ == cmd) {
161    if ((p_cb->state == SMP_STATE_IDLE) &&
162        (p_cb->br_state == SMP_BR_STATE_IDLE) &&
163        !(p_cb->flags & SMP_PAIR_FLAGS_WE_STARTED_DD)) {
164      p_cb->role = L2CA_GetBleConnRole(bd_addr);
165      memcpy(&p_cb->pairing_bda[0], bd_addr, BD_ADDR_LEN);
166    } else if (memcmp(&bd_addr[0], p_cb->pairing_bda, BD_ADDR_LEN)) {
167      osi_free(p_buf);
168      smp_reject_unexpected_pairing_command(bd_addr);
169      return;
170    }
171    /* else, out of state pairing request/security request received, passed into
172     * SM */
173  }
174
175  if (memcmp(&bd_addr[0], p_cb->pairing_bda, BD_ADDR_LEN) == 0) {
176    alarm_set_on_queue(p_cb->smp_rsp_timer_ent, SMP_WAIT_FOR_RSP_TIMEOUT_MS,
177                       smp_rsp_timeout, NULL, btu_general_alarm_queue);
178
179    if (cmd == SMP_OPCODE_CONFIRM) {
180      SMP_TRACE_DEBUG(
181          "in %s cmd = 0x%02x, peer_auth_req = 0x%02x,"
182          "loc_auth_req = 0x%02x",
183          __func__, cmd, p_cb->peer_auth_req, p_cb->loc_auth_req);
184
185      if ((p_cb->peer_auth_req & SMP_SC_SUPPORT_BIT) &&
186          (p_cb->loc_auth_req & SMP_SC_SUPPORT_BIT)) {
187        cmd = SMP_OPCODE_PAIR_COMMITM;
188      }
189    }
190
191    p_cb->rcvd_cmd_code = cmd;
192    p_cb->rcvd_cmd_len = (uint8_t)p_buf->len;
193    smp_sm_event(p_cb, cmd, p);
194  }
195
196  osi_free(p_buf);
197}
198
199/*******************************************************************************
200 *
201 * Function         smp_tx_complete_callback
202 *
203 * Description      SMP channel tx complete callback
204 *
205 ******************************************************************************/
206static void smp_tx_complete_callback(uint16_t cid, uint16_t num_pkt) {
207  tSMP_CB* p_cb = &smp_cb;
208
209  if (p_cb->total_tx_unacked >= num_pkt)
210    p_cb->total_tx_unacked -= num_pkt;
211  else
212    SMP_TRACE_ERROR("Unexpected %s: num_pkt = %d", __func__, num_pkt);
213
214  uint8_t reason = SMP_SUCCESS;
215  if (p_cb->total_tx_unacked == 0 && p_cb->wait_for_authorization_complete) {
216    if (cid == L2CAP_SMP_CID)
217      smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &reason);
218    else
219      smp_br_state_machine_event(p_cb, SMP_BR_AUTH_CMPL_EVT, &reason);
220  }
221}
222
223/*******************************************************************************
224 *
225 * Function         smp_br_connect_callback
226 *
227 * Description      This callback function is called by L2CAP to indicate that
228 *                  SMP BR channel is
229 *                      connected (conn = true)/disconnected (conn = false).
230 *
231 ******************************************************************************/
232static void smp_br_connect_callback(uint16_t channel, BD_ADDR bd_addr,
233                                    bool connected, uint16_t reason,
234                                    tBT_TRANSPORT transport) {
235  tSMP_CB* p_cb = &smp_cb;
236  tSMP_INT_DATA int_data;
237
238  SMP_TRACE_EVENT("%s", __func__);
239
240  if (transport != BT_TRANSPORT_BR_EDR) {
241    SMP_TRACE_WARNING("%s is called on unexpected transport %d", __func__,
242                      transport);
243    return;
244  }
245
246  if (!(memcmp(bd_addr, p_cb->pairing_bda, BD_ADDR_LEN) == 0)) return;
247
248  SMP_TRACE_EVENT(
249      "%s for pairing BDA: %08x%04x  Event: %s", __func__,
250      (bd_addr[0] << 24) + (bd_addr[1] << 16) + (bd_addr[2] << 8) + bd_addr[3],
251      (bd_addr[4] << 8) + bd_addr[5],
252      (connected) ? "connected" : "disconnected");
253
254  if (connected) {
255    if (!p_cb->connect_initialized) {
256      p_cb->connect_initialized = true;
257      /* initialize local i/r key to be default keys */
258      p_cb->local_r_key = p_cb->local_i_key = SMP_BR_SEC_DEFAULT_KEY;
259      p_cb->loc_auth_req = p_cb->peer_auth_req = 0;
260      p_cb->cb_evt = SMP_BR_KEYS_REQ_EVT;
261      smp_br_state_machine_event(p_cb, SMP_BR_L2CAP_CONN_EVT, NULL);
262    }
263  } else {
264    int_data.reason = reason;
265    /* Disconnected while doing security */
266    smp_br_state_machine_event(p_cb, SMP_BR_L2CAP_DISCONN_EVT, &int_data);
267  }
268}
269
270/*******************************************************************************
271 *
272 * Function         smp_br_data_received
273 *
274 * Description      This function is called when data is received from L2CAP on
275 *                  SMP BR channel.
276 *
277 * Returns          void
278 *
279 ******************************************************************************/
280static void smp_br_data_received(uint16_t channel, BD_ADDR bd_addr,
281                                 BT_HDR* p_buf) {
282  tSMP_CB* p_cb = &smp_cb;
283  uint8_t* p = (uint8_t*)(p_buf + 1) + p_buf->offset;
284  uint8_t cmd;
285  SMP_TRACE_EVENT("SMDBG l2c %s", __func__);
286
287  STREAM_TO_UINT8(cmd, p);
288
289  /* sanity check */
290  if ((SMP_OPCODE_MAX < cmd) || (SMP_OPCODE_MIN > cmd)) {
291    SMP_TRACE_WARNING("Ignore received command with RESERVED code 0x%02x", cmd);
292    osi_free(p_buf);
293    return;
294  }
295
296  /* reject the pairing request if there is an on-going SMP pairing */
297  if (SMP_OPCODE_PAIRING_REQ == cmd) {
298    if ((p_cb->state == SMP_STATE_IDLE) &&
299        (p_cb->br_state == SMP_BR_STATE_IDLE)) {
300      p_cb->role = HCI_ROLE_SLAVE;
301      p_cb->smp_over_br = true;
302      memcpy(&p_cb->pairing_bda[0], bd_addr, BD_ADDR_LEN);
303    } else if (memcmp(&bd_addr[0], p_cb->pairing_bda, BD_ADDR_LEN)) {
304      osi_free(p_buf);
305      smp_reject_unexpected_pairing_command(bd_addr);
306      return;
307    }
308    /* else, out of state pairing request received, passed into State Machine */
309  }
310
311  if (memcmp(&bd_addr[0], p_cb->pairing_bda, BD_ADDR_LEN) == 0) {
312    alarm_set_on_queue(p_cb->smp_rsp_timer_ent, SMP_WAIT_FOR_RSP_TIMEOUT_MS,
313                       smp_rsp_timeout, NULL, btu_general_alarm_queue);
314
315    p_cb->rcvd_cmd_code = cmd;
316    p_cb->rcvd_cmd_len = (uint8_t)p_buf->len;
317    smp_br_state_machine_event(p_cb, cmd, p);
318  }
319
320  osi_free(p_buf);
321}
322