1 /*
2 *
3 * BlueZ - Bluetooth protocol stack for Linux
4 *
5 * Copyright (C) 2004-2009 Marcel Holtmann <marcel@holtmann.org>
6 * Copyright (C) 2009 The Android Open Source Project
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 *
22 */
23
24 #include <unistd.h>
25 #include <errno.h>
26 #include <sys/ioctl.h>
27 #include <sys/types.h>
28 #include <sys/socket.h>
29
30 #include <private/android_filesystem_config.h>
31 #include <sys/prctl.h>
32 #include <linux/capability.h>
33
34 #include <bluetooth/bluetooth.h>
35 #include <bluetooth/hci.h>
36
37 /* Set UID to bluetooth w/ CAP_NET_RAW, CAP_NET_ADMIN and CAP_NET_BIND_SERVICE
38 * (Android's init.rc does not yet support applying linux capabilities) */
android_set_aid_and_cap()39 void android_set_aid_and_cap() {
40 prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
41 setuid(AID_BLUETOOTH);
42
43 struct __user_cap_header_struct header;
44 struct __user_cap_data_struct cap;
45 header.version = _LINUX_CAPABILITY_VERSION;
46 header.pid = 0;
47 cap.effective = cap.permitted = 1 << CAP_NET_RAW |
48 1 << CAP_NET_ADMIN |
49 1 << CAP_NET_BIND_SERVICE;
50 cap.inheritable = 0;
51 capset(&header, &cap);
52 }
53
54 #ifdef BOARD_HAVE_BLUETOOTH_BCM
vendor_high_priority(int fd,uint16_t handle)55 static int vendor_high_priority(int fd, uint16_t handle) {
56 unsigned char hci_sleep_cmd[] = {
57 0x01, // HCI command packet
58 0x57, 0xfc, // HCI_Write_High_Priority_Connection
59 0x02, // Length
60 0x00, 0x00 // Handle
61 };
62
63 hci_sleep_cmd[4] = (uint8_t)handle;
64 hci_sleep_cmd[5] = (uint8_t)(handle >> 8);
65
66 int ret = write(fd, hci_sleep_cmd, sizeof(hci_sleep_cmd));
67 if (ret < 0) {
68 error("write(): %s (%d)]", strerror(errno), errno);
69 return -1;
70 } else if (ret != sizeof(hci_sleep_cmd)) {
71 error("write(): unexpected length %d", ret);
72 return -1;
73 }
74 return 0;
75 }
76
get_hci_sock()77 static int get_hci_sock() {
78 int sock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
79 struct sockaddr_hci addr;
80 int opt;
81
82 if(sock < 0) {
83 error("Can't create raw HCI socket!");
84 return -1;
85 }
86
87 opt = 1;
88 if (setsockopt(sock, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) {
89 error("Error setting data direction\n");
90 return -1;
91 }
92
93 /* Bind socket to the HCI device */
94 addr.hci_family = AF_BLUETOOTH;
95 addr.hci_dev = 0; // hci0
96 if(bind(sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
97 error("Can't attach to device hci0. %s(%d)\n",
98 strerror(errno),
99 errno);
100 return -1;
101 }
102 return sock;
103 }
104
get_acl_handle(int fd,bdaddr_t * bdaddr)105 static int get_acl_handle(int fd, bdaddr_t *bdaddr) {
106 int i;
107 int ret = -1;
108 struct hci_conn_list_req *conn_list;
109 struct hci_conn_info *conn_info;
110 int max_conn = 10;
111
112 conn_list = malloc(max_conn * (
113 sizeof(struct hci_conn_list_req) + sizeof(struct hci_conn_info)));
114 if (!conn_list) {
115 error("Out of memory in %s\n", __FUNCTION__);
116 return -1;
117 }
118
119 conn_list->dev_id = 0; /* hardcoded to HCI device 0 */
120 conn_list->conn_num = max_conn;
121
122 if (ioctl(fd, HCIGETCONNLIST, (void *)conn_list)) {
123 error("Failed to get connection list\n");
124 goto out;
125 }
126
127 for (i=0; i < conn_list->conn_num; i++) {
128 conn_info = &conn_list->conn_info[i];
129 if (conn_info->type == ACL_LINK &&
130 !memcmp((void *)&conn_info->bdaddr, (void *)bdaddr,
131 sizeof(bdaddr_t))) {
132 ret = conn_info->handle;
133 goto out;
134 }
135 }
136 ret = 0;
137
138 out:
139 free(conn_list);
140 return ret;
141 }
142
143 /* Request that the ACL link to a given Bluetooth connection be high priority,
144 * for improved coexistance support
145 */
android_set_high_priority(bdaddr_t * ba)146 int android_set_high_priority(bdaddr_t *ba) {
147 int ret;
148 int fd = get_hci_sock();
149 int acl_handle;
150
151 if (fd < 0)
152 return fd;
153
154 acl_handle = get_acl_handle(fd, ba);
155 if (acl_handle < 0) {
156 ret = acl_handle;
157 goto out;
158 }
159
160 ret = vendor_high_priority(fd, acl_handle);
161
162 out:
163 close(fd);
164
165 return ret;
166 }
167
168 #else
169
android_set_high_priority(bdaddr_t * ba)170 int android_set_high_priority(bdaddr_t *ba) {
171 return 0;
172 }
173
174 #endif
175