| /* |
| BlueZ - Bluetooth protocol stack for Linux |
| Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved. |
| |
| Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License version 2 as |
| published by the Free Software Foundation; |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. |
| IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY |
| CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
| WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
| COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS |
| SOFTWARE IS DISCLAIMED. |
| */ |
| |
| /* Bluetooth HCI connection handling. */ |
| |
| #include <linux/module.h> |
| |
| #include <linux/types.h> |
| #include <linux/errno.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/poll.h> |
| #include <linux/fcntl.h> |
| #include <linux/init.h> |
| #include <linux/skbuff.h> |
| #include <linux/interrupt.h> |
| #include <linux/notifier.h> |
| #include <net/sock.h> |
| |
| #include <asm/system.h> |
| #include <linux/uaccess.h> |
| #include <asm/unaligned.h> |
| |
| #include <net/bluetooth/bluetooth.h> |
| #include <net/bluetooth/hci_core.h> |
| |
| static void hci_le_connect(struct hci_conn *conn) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| struct hci_cp_le_create_conn cp; |
| |
| conn->state = BT_CONNECT; |
| conn->out = true; |
| conn->link_mode |= HCI_LM_MASTER; |
| conn->sec_level = BT_SECURITY_LOW; |
| |
| memset(&cp, 0, sizeof(cp)); |
| cp.scan_interval = cpu_to_le16(0x0060); |
| cp.scan_window = cpu_to_le16(0x0030); |
| bacpy(&cp.peer_addr, &conn->dst); |
| cp.peer_addr_type = conn->dst_type; |
| cp.conn_interval_min = cpu_to_le16(0x0028); |
| cp.conn_interval_max = cpu_to_le16(0x0038); |
| cp.supervision_timeout = cpu_to_le16(0x002a); |
| cp.min_ce_len = cpu_to_le16(0x0000); |
| cp.max_ce_len = cpu_to_le16(0x0000); |
| |
| hci_send_cmd(hdev, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp); |
| } |
| |
| static void hci_le_connect_cancel(struct hci_conn *conn) |
| { |
| hci_send_cmd(conn->hdev, HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL); |
| } |
| |
| void hci_acl_connect(struct hci_conn *conn) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| struct inquiry_entry *ie; |
| struct hci_cp_create_conn cp; |
| |
| BT_DBG("%p", conn); |
| |
| conn->state = BT_CONNECT; |
| conn->out = true; |
| |
| conn->link_mode = HCI_LM_MASTER; |
| |
| conn->attempt++; |
| |
| conn->link_policy = hdev->link_policy; |
| |
| memset(&cp, 0, sizeof(cp)); |
| bacpy(&cp.bdaddr, &conn->dst); |
| cp.pscan_rep_mode = 0x02; |
| |
| ie = hci_inquiry_cache_lookup(hdev, &conn->dst); |
| if (ie) { |
| if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) { |
| cp.pscan_rep_mode = ie->data.pscan_rep_mode; |
| cp.pscan_mode = ie->data.pscan_mode; |
| cp.clock_offset = ie->data.clock_offset | |
| cpu_to_le16(0x8000); |
| } |
| |
| memcpy(conn->dev_class, ie->data.dev_class, 3); |
| if (ie->data.ssp_mode > 0) |
| set_bit(HCI_CONN_SSP_ENABLED, &conn->flags); |
| } |
| |
| cp.pkt_type = cpu_to_le16(conn->pkt_type); |
| if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER)) |
| cp.role_switch = 0x01; |
| else |
| cp.role_switch = 0x00; |
| |
| hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp); |
| } |
| |
| static void hci_acl_connect_cancel(struct hci_conn *conn) |
| { |
| struct hci_cp_create_conn_cancel cp; |
| |
| BT_DBG("%p", conn); |
| |
| if (conn->hdev->hci_ver < BLUETOOTH_VER_1_2) |
| return; |
| |
| bacpy(&cp.bdaddr, &conn->dst); |
| hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp); |
| } |
| |
| void hci_acl_disconn(struct hci_conn *conn, __u8 reason) |
| { |
| struct hci_cp_disconnect cp; |
| |
| BT_DBG("%p", conn); |
| |
| conn->state = BT_DISCONN; |
| |
| cp.handle = cpu_to_le16(conn->handle); |
| cp.reason = reason; |
| hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp); |
| } |
| |
| void hci_add_sco(struct hci_conn *conn, __u16 handle) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| struct hci_cp_add_sco cp; |
| |
| BT_DBG("%p", conn); |
| |
| conn->state = BT_CONNECT; |
| conn->out = true; |
| |
| conn->attempt++; |
| |
| cp.handle = cpu_to_le16(handle); |
| cp.pkt_type = cpu_to_le16(conn->pkt_type); |
| |
| hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp); |
| } |
| |
| void hci_setup_sync(struct hci_conn *conn, __u16 handle) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| struct hci_cp_setup_sync_conn cp; |
| |
| BT_DBG("%p", conn); |
| |
| conn->state = BT_CONNECT; |
| conn->out = true; |
| |
| conn->attempt++; |
| |
| cp.handle = cpu_to_le16(handle); |
| cp.pkt_type = cpu_to_le16(conn->pkt_type); |
| |
| cp.tx_bandwidth = cpu_to_le32(0x00001f40); |
| cp.rx_bandwidth = cpu_to_le32(0x00001f40); |
| cp.max_latency = cpu_to_le16(0xffff); |
| cp.voice_setting = cpu_to_le16(hdev->voice_setting); |
| cp.retrans_effort = 0xff; |
| |
| hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp); |
| } |
| |
| void hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, |
| u16 latency, u16 to_multiplier) |
| { |
| struct hci_cp_le_conn_update cp; |
| struct hci_dev *hdev = conn->hdev; |
| |
| memset(&cp, 0, sizeof(cp)); |
| |
| cp.handle = cpu_to_le16(conn->handle); |
| cp.conn_interval_min = cpu_to_le16(min); |
| cp.conn_interval_max = cpu_to_le16(max); |
| cp.conn_latency = cpu_to_le16(latency); |
| cp.supervision_timeout = cpu_to_le16(to_multiplier); |
| cp.min_ce_len = cpu_to_le16(0x0001); |
| cp.max_ce_len = cpu_to_le16(0x0001); |
| |
| hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp); |
| } |
| EXPORT_SYMBOL(hci_le_conn_update); |
| |
| void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __u8 rand[8], |
| __u8 ltk[16]) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| struct hci_cp_le_start_enc cp; |
| |
| BT_DBG("%p", conn); |
| |
| memset(&cp, 0, sizeof(cp)); |
| |
| cp.handle = cpu_to_le16(conn->handle); |
| memcpy(cp.ltk, ltk, sizeof(cp.ltk)); |
| cp.ediv = ediv; |
| memcpy(cp.rand, rand, sizeof(cp.rand)); |
| |
| hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp); |
| } |
| EXPORT_SYMBOL(hci_le_start_enc); |
| |
| void hci_le_ltk_reply(struct hci_conn *conn, u8 ltk[16]) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| struct hci_cp_le_ltk_reply cp; |
| |
| BT_DBG("%p", conn); |
| |
| memset(&cp, 0, sizeof(cp)); |
| |
| cp.handle = cpu_to_le16(conn->handle); |
| memcpy(cp.ltk, ltk, sizeof(ltk)); |
| |
| hci_send_cmd(hdev, HCI_OP_LE_LTK_REPLY, sizeof(cp), &cp); |
| } |
| EXPORT_SYMBOL(hci_le_ltk_reply); |
| |
| void hci_le_ltk_neg_reply(struct hci_conn *conn) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| struct hci_cp_le_ltk_neg_reply cp; |
| |
| BT_DBG("%p", conn); |
| |
| memset(&cp, 0, sizeof(cp)); |
| |
| cp.handle = cpu_to_le16(conn->handle); |
| |
| hci_send_cmd(hdev, HCI_OP_LE_LTK_NEG_REPLY, sizeof(cp), &cp); |
| } |
| |
| /* Device _must_ be locked */ |
| void hci_sco_setup(struct hci_conn *conn, __u8 status) |
| { |
| struct hci_conn *sco = conn->link; |
| |
| BT_DBG("%p", conn); |
| |
| if (!sco) |
| return; |
| |
| if (!status) { |
| if (lmp_esco_capable(conn->hdev)) |
| hci_setup_sync(sco, conn->handle); |
| else |
| hci_add_sco(sco, conn->handle); |
| } else { |
| hci_proto_connect_cfm(sco, status); |
| hci_conn_del(sco); |
| } |
| } |
| |
| static void hci_conn_timeout(struct work_struct *work) |
| { |
| struct hci_conn *conn = container_of(work, struct hci_conn, |
| disc_work.work); |
| __u8 reason; |
| |
| BT_DBG("conn %p state %d", conn, conn->state); |
| |
| if (atomic_read(&conn->refcnt)) |
| return; |
| |
| switch (conn->state) { |
| case BT_CONNECT: |
| case BT_CONNECT2: |
| if (conn->out) { |
| if (conn->type == ACL_LINK) |
| hci_acl_connect_cancel(conn); |
| else if (conn->type == LE_LINK) |
| hci_le_connect_cancel(conn); |
| } |
| break; |
| case BT_CONFIG: |
| case BT_CONNECTED: |
| reason = hci_proto_disconn_ind(conn); |
| hci_acl_disconn(conn, reason); |
| break; |
| default: |
| conn->state = BT_CLOSED; |
| break; |
| } |
| } |
| |
| /* Enter sniff mode */ |
| static void hci_conn_enter_sniff_mode(struct hci_conn *conn) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| |
| BT_DBG("conn %p mode %d", conn, conn->mode); |
| |
| if (test_bit(HCI_RAW, &hdev->flags)) |
| return; |
| |
| if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn)) |
| return; |
| |
| if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF)) |
| return; |
| |
| if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) { |
| struct hci_cp_sniff_subrate cp; |
| cp.handle = cpu_to_le16(conn->handle); |
| cp.max_latency = cpu_to_le16(0); |
| cp.min_remote_timeout = cpu_to_le16(0); |
| cp.min_local_timeout = cpu_to_le16(0); |
| hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp); |
| } |
| |
| if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { |
| struct hci_cp_sniff_mode cp; |
| cp.handle = cpu_to_le16(conn->handle); |
| cp.max_interval = cpu_to_le16(hdev->sniff_max_interval); |
| cp.min_interval = cpu_to_le16(hdev->sniff_min_interval); |
| cp.attempt = cpu_to_le16(4); |
| cp.timeout = cpu_to_le16(1); |
| hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp); |
| } |
| } |
| |
| static void hci_conn_idle(unsigned long arg) |
| { |
| struct hci_conn *conn = (void *) arg; |
| |
| BT_DBG("conn %p mode %d", conn, conn->mode); |
| |
| hci_conn_enter_sniff_mode(conn); |
| } |
| |
| static void hci_conn_auto_accept(unsigned long arg) |
| { |
| struct hci_conn *conn = (void *) arg; |
| struct hci_dev *hdev = conn->hdev; |
| |
| hci_send_cmd(hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst), |
| &conn->dst); |
| } |
| |
| struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst) |
| { |
| struct hci_conn *conn; |
| |
| BT_DBG("%s dst %s", hdev->name, batostr(dst)); |
| |
| conn = kzalloc(sizeof(struct hci_conn), GFP_KERNEL); |
| if (!conn) |
| return NULL; |
| |
| bacpy(&conn->dst, dst); |
| conn->hdev = hdev; |
| conn->type = type; |
| conn->mode = HCI_CM_ACTIVE; |
| conn->state = BT_OPEN; |
| conn->auth_type = HCI_AT_GENERAL_BONDING; |
| conn->io_capability = hdev->io_capability; |
| conn->remote_auth = 0xff; |
| conn->key_type = 0xff; |
| |
| set_bit(HCI_CONN_POWER_SAVE, &conn->flags); |
| conn->disc_timeout = HCI_DISCONN_TIMEOUT; |
| |
| switch (type) { |
| case ACL_LINK: |
| conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK; |
| break; |
| case SCO_LINK: |
| if (lmp_esco_capable(hdev)) |
| conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) | |
| (hdev->esco_type & EDR_ESCO_MASK); |
| else |
| conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK; |
| break; |
| case ESCO_LINK: |
| conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK; |
| break; |
| } |
| |
| skb_queue_head_init(&conn->data_q); |
| |
| INIT_LIST_HEAD(&conn->chan_list);; |
| |
| INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout); |
| setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn); |
| setup_timer(&conn->auto_accept_timer, hci_conn_auto_accept, |
| (unsigned long) conn); |
| |
| atomic_set(&conn->refcnt, 0); |
| |
| hci_dev_hold(hdev); |
| |
| hci_conn_hash_add(hdev, conn); |
| if (hdev->notify) |
| hdev->notify(hdev, HCI_NOTIFY_CONN_ADD); |
| |
| atomic_set(&conn->devref, 0); |
| |
| hci_conn_init_sysfs(conn); |
| |
| return conn; |
| } |
| |
| int hci_conn_del(struct hci_conn *conn) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| |
| BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle); |
| |
| del_timer(&conn->idle_timer); |
| |
| cancel_delayed_work_sync(&conn->disc_work); |
| |
| del_timer(&conn->auto_accept_timer); |
| |
| if (conn->type == ACL_LINK) { |
| struct hci_conn *sco = conn->link; |
| if (sco) |
| sco->link = NULL; |
| |
| /* Unacked frames */ |
| hdev->acl_cnt += conn->sent; |
| } else if (conn->type == LE_LINK) { |
| if (hdev->le_pkts) |
| hdev->le_cnt += conn->sent; |
| else |
| hdev->acl_cnt += conn->sent; |
| } else { |
| struct hci_conn *acl = conn->link; |
| if (acl) { |
| acl->link = NULL; |
| hci_conn_put(acl); |
| } |
| } |
| |
| |
| hci_chan_list_flush(conn); |
| |
| hci_conn_hash_del(hdev, conn); |
| if (hdev->notify) |
| hdev->notify(hdev, HCI_NOTIFY_CONN_DEL); |
| |
| skb_queue_purge(&conn->data_q); |
| |
| hci_conn_put_device(conn); |
| |
| hci_dev_put(hdev); |
| |
| if (conn->handle == 0) |
| kfree(conn); |
| |
| return 0; |
| } |
| |
| struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src) |
| { |
| int use_src = bacmp(src, BDADDR_ANY); |
| struct hci_dev *hdev = NULL, *d; |
| |
| BT_DBG("%s -> %s", batostr(src), batostr(dst)); |
| |
| read_lock(&hci_dev_list_lock); |
| |
| list_for_each_entry(d, &hci_dev_list, list) { |
| if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags)) |
| continue; |
| |
| /* Simple routing: |
| * No source address - find interface with bdaddr != dst |
| * Source address - find interface with bdaddr == src |
| */ |
| |
| if (use_src) { |
| if (!bacmp(&d->bdaddr, src)) { |
| hdev = d; break; |
| } |
| } else { |
| if (bacmp(&d->bdaddr, dst)) { |
| hdev = d; break; |
| } |
| } |
| } |
| |
| if (hdev) |
| hdev = hci_dev_hold(hdev); |
| |
| read_unlock(&hci_dev_list_lock); |
| return hdev; |
| } |
| EXPORT_SYMBOL(hci_get_route); |
| |
| /* Create SCO, ACL or LE connection. |
| * Device _must_ be locked */ |
| struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type) |
| { |
| struct hci_conn *acl; |
| struct hci_conn *sco; |
| struct hci_conn *le; |
| |
| BT_DBG("%s dst %s", hdev->name, batostr(dst)); |
| |
| if (type == LE_LINK) { |
| struct adv_entry *entry; |
| |
| le = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst); |
| if (le) |
| return ERR_PTR(-EBUSY); |
| |
| entry = hci_find_adv_entry(hdev, dst); |
| if (!entry) |
| return ERR_PTR(-EHOSTUNREACH); |
| |
| le = hci_conn_add(hdev, LE_LINK, dst); |
| if (!le) |
| return ERR_PTR(-ENOMEM); |
| |
| le->dst_type = entry->bdaddr_type; |
| |
| hci_le_connect(le); |
| |
| hci_conn_hold(le); |
| |
| return le; |
| } |
| |
| acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst); |
| if (!acl) { |
| acl = hci_conn_add(hdev, ACL_LINK, dst); |
| if (!acl) |
| return NULL; |
| } |
| |
| hci_conn_hold(acl); |
| |
| if (acl->state == BT_OPEN || acl->state == BT_CLOSED) { |
| acl->sec_level = BT_SECURITY_LOW; |
| acl->pending_sec_level = sec_level; |
| acl->auth_type = auth_type; |
| hci_acl_connect(acl); |
| } |
| |
| if (type == ACL_LINK) |
| return acl; |
| |
| sco = hci_conn_hash_lookup_ba(hdev, type, dst); |
| if (!sco) { |
| sco = hci_conn_add(hdev, type, dst); |
| if (!sco) { |
| hci_conn_put(acl); |
| return NULL; |
| } |
| } |
| |
| acl->link = sco; |
| sco->link = acl; |
| |
| hci_conn_hold(sco); |
| |
| if (acl->state == BT_CONNECTED && |
| (sco->state == BT_OPEN || sco->state == BT_CLOSED)) { |
| set_bit(HCI_CONN_POWER_SAVE, &acl->flags); |
| hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON); |
| |
| if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) { |
| /* defer SCO setup until mode change completed */ |
| set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags); |
| return sco; |
| } |
| |
| hci_sco_setup(acl, 0x00); |
| } |
| |
| return sco; |
| } |
| EXPORT_SYMBOL(hci_connect); |
| |
| /* Check link security requirement */ |
| int hci_conn_check_link_mode(struct hci_conn *conn) |
| { |
| BT_DBG("conn %p", conn); |
| |
| if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT)) |
| return 0; |
| |
| return 1; |
| } |
| EXPORT_SYMBOL(hci_conn_check_link_mode); |
| |
| /* Authenticate remote device */ |
| static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type) |
| { |
| BT_DBG("conn %p", conn); |
| |
| if (conn->pending_sec_level > sec_level) |
| sec_level = conn->pending_sec_level; |
| |
| if (sec_level > conn->sec_level) |
| conn->pending_sec_level = sec_level; |
| else if (conn->link_mode & HCI_LM_AUTH) |
| return 1; |
| |
| /* Make sure we preserve an existing MITM requirement*/ |
| auth_type |= (conn->auth_type & 0x01); |
| |
| conn->auth_type = auth_type; |
| |
| if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) { |
| struct hci_cp_auth_requested cp; |
| cp.handle = cpu_to_le16(conn->handle); |
| hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED, |
| sizeof(cp), &cp); |
| if (conn->key_type != 0xff) |
| set_bit(HCI_CONN_REAUTH_PEND, &conn->flags); |
| } |
| |
| return 0; |
| } |
| |
| /* Encrypt the the link */ |
| static void hci_conn_encrypt(struct hci_conn *conn) |
| { |
| BT_DBG("conn %p", conn); |
| |
| if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) { |
| struct hci_cp_set_conn_encrypt cp; |
| cp.handle = cpu_to_le16(conn->handle); |
| cp.encrypt = 0x01; |
| hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp), |
| &cp); |
| } |
| } |
| |
| /* Enable security */ |
| int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type) |
| { |
| BT_DBG("conn %p", conn); |
| |
| /* For sdp we don't need the link key. */ |
| if (sec_level == BT_SECURITY_SDP) |
| return 1; |
| |
| /* For non 2.1 devices and low security level we don't need the link |
| key. */ |
| if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn)) |
| return 1; |
| |
| /* For other security levels we need the link key. */ |
| if (!(conn->link_mode & HCI_LM_AUTH)) |
| goto auth; |
| |
| /* An authenticated combination key has sufficient security for any |
| security level. */ |
| if (conn->key_type == HCI_LK_AUTH_COMBINATION) |
| goto encrypt; |
| |
| /* An unauthenticated combination key has sufficient security for |
| security level 1 and 2. */ |
| if (conn->key_type == HCI_LK_UNAUTH_COMBINATION && |
| (sec_level == BT_SECURITY_MEDIUM || |
| sec_level == BT_SECURITY_LOW)) |
| goto encrypt; |
| |
| /* A combination key has always sufficient security for the security |
| levels 1 or 2. High security level requires the combination key |
| is generated using maximum PIN code length (16). |
| For pre 2.1 units. */ |
| if (conn->key_type == HCI_LK_COMBINATION && |
| (sec_level != BT_SECURITY_HIGH || |
| conn->pin_length == 16)) |
| goto encrypt; |
| |
| auth: |
| if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) |
| return 0; |
| |
| if (!hci_conn_auth(conn, sec_level, auth_type)) |
| return 0; |
| |
| encrypt: |
| if (conn->link_mode & HCI_LM_ENCRYPT) |
| return 1; |
| |
| hci_conn_encrypt(conn); |
| return 0; |
| } |
| EXPORT_SYMBOL(hci_conn_security); |
| |
| /* Check secure link requirement */ |
| int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level) |
| { |
| BT_DBG("conn %p", conn); |
| |
| if (sec_level != BT_SECURITY_HIGH) |
| return 1; /* Accept if non-secure is required */ |
| |
| if (conn->sec_level == BT_SECURITY_HIGH) |
| return 1; |
| |
| return 0; /* Reject not secure link */ |
| } |
| EXPORT_SYMBOL(hci_conn_check_secure); |
| |
| /* Change link key */ |
| int hci_conn_change_link_key(struct hci_conn *conn) |
| { |
| BT_DBG("conn %p", conn); |
| |
| if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) { |
| struct hci_cp_change_conn_link_key cp; |
| cp.handle = cpu_to_le16(conn->handle); |
| hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY, |
| sizeof(cp), &cp); |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(hci_conn_change_link_key); |
| |
| /* Switch role */ |
| int hci_conn_switch_role(struct hci_conn *conn, __u8 role) |
| { |
| BT_DBG("conn %p", conn); |
| |
| if (!role && conn->link_mode & HCI_LM_MASTER) |
| return 1; |
| |
| if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) { |
| struct hci_cp_switch_role cp; |
| bacpy(&cp.bdaddr, &conn->dst); |
| cp.role = role; |
| hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp); |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(hci_conn_switch_role); |
| |
| /* Enter active mode */ |
| void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| |
| BT_DBG("conn %p mode %d", conn, conn->mode); |
| |
| if (test_bit(HCI_RAW, &hdev->flags)) |
| return; |
| |
| if (conn->mode != HCI_CM_SNIFF) |
| goto timer; |
| |
| if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active) |
| goto timer; |
| |
| if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { |
| struct hci_cp_exit_sniff_mode cp; |
| cp.handle = cpu_to_le16(conn->handle); |
| hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp); |
| } |
| |
| timer: |
| if (hdev->idle_timeout > 0) |
| mod_timer(&conn->idle_timer, |
| jiffies + msecs_to_jiffies(hdev->idle_timeout)); |
| } |
| |
| /* Drop all connection on the device */ |
| void hci_conn_hash_flush(struct hci_dev *hdev) |
| { |
| struct hci_conn_hash *h = &hdev->conn_hash; |
| struct hci_conn *c; |
| |
| BT_DBG("hdev %s", hdev->name); |
| |
| list_for_each_entry_rcu(c, &h->list, list) { |
| c->state = BT_CLOSED; |
| |
| hci_proto_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM); |
| hci_conn_del(c); |
| } |
| } |
| |
| /* Check pending connect attempts */ |
| void hci_conn_check_pending(struct hci_dev *hdev) |
| { |
| struct hci_conn *conn; |
| |
| BT_DBG("hdev %s", hdev->name); |
| |
| hci_dev_lock(hdev); |
| |
| conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2); |
| if (conn) |
| hci_acl_connect(conn); |
| |
| hci_dev_unlock(hdev); |
| } |
| |
| void hci_conn_hold_device(struct hci_conn *conn) |
| { |
| atomic_inc(&conn->devref); |
| } |
| EXPORT_SYMBOL(hci_conn_hold_device); |
| |
| void hci_conn_put_device(struct hci_conn *conn) |
| { |
| if (atomic_dec_and_test(&conn->devref)) |
| hci_conn_del_sysfs(conn); |
| } |
| EXPORT_SYMBOL(hci_conn_put_device); |
| |
| int hci_get_conn_list(void __user *arg) |
| { |
| register struct hci_conn *c; |
| struct hci_conn_list_req req, *cl; |
| struct hci_conn_info *ci; |
| struct hci_dev *hdev; |
| int n = 0, size, err; |
| |
| if (copy_from_user(&req, arg, sizeof(req))) |
| return -EFAULT; |
| |
| if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci)) |
| return -EINVAL; |
| |
| size = sizeof(req) + req.conn_num * sizeof(*ci); |
| |
| cl = kmalloc(size, GFP_KERNEL); |
| if (!cl) |
| return -ENOMEM; |
| |
| hdev = hci_dev_get(req.dev_id); |
| if (!hdev) { |
| kfree(cl); |
| return -ENODEV; |
| } |
| |
| ci = cl->conn_info; |
| |
| hci_dev_lock(hdev); |
| list_for_each_entry(c, &hdev->conn_hash.list, list) { |
| bacpy(&(ci + n)->bdaddr, &c->dst); |
| (ci + n)->handle = c->handle; |
| (ci + n)->type = c->type; |
| (ci + n)->out = c->out; |
| (ci + n)->state = c->state; |
| (ci + n)->link_mode = c->link_mode; |
| if (++n >= req.conn_num) |
| break; |
| } |
| hci_dev_unlock(hdev); |
| |
| cl->dev_id = hdev->id; |
| cl->conn_num = n; |
| size = sizeof(req) + n * sizeof(*ci); |
| |
| hci_dev_put(hdev); |
| |
| err = copy_to_user(arg, cl, size); |
| kfree(cl); |
| |
| return err ? -EFAULT : 0; |
| } |
| |
| int hci_get_conn_info(struct hci_dev *hdev, void __user *arg) |
| { |
| struct hci_conn_info_req req; |
| struct hci_conn_info ci; |
| struct hci_conn *conn; |
| char __user *ptr = arg + sizeof(req); |
| |
| if (copy_from_user(&req, arg, sizeof(req))) |
| return -EFAULT; |
| |
| hci_dev_lock(hdev); |
| conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr); |
| if (conn) { |
| bacpy(&ci.bdaddr, &conn->dst); |
| ci.handle = conn->handle; |
| ci.type = conn->type; |
| ci.out = conn->out; |
| ci.state = conn->state; |
| ci.link_mode = conn->link_mode; |
| } |
| hci_dev_unlock(hdev); |
| |
| if (!conn) |
| return -ENOENT; |
| |
| return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0; |
| } |
| |
| int hci_get_auth_info(struct hci_dev *hdev, void __user *arg) |
| { |
| struct hci_auth_info_req req; |
| struct hci_conn *conn; |
| |
| if (copy_from_user(&req, arg, sizeof(req))) |
| return -EFAULT; |
| |
| hci_dev_lock(hdev); |
| conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr); |
| if (conn) |
| req.type = conn->auth_type; |
| hci_dev_unlock(hdev); |
| |
| if (!conn) |
| return -ENOENT; |
| |
| return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0; |
| } |
| |
| struct hci_chan *hci_chan_create(struct hci_conn *conn) |
| { |
| struct hci_dev *hdev = conn->hdev; |
| struct hci_chan *chan; |
| |
| BT_DBG("%s conn %p", hdev->name, conn); |
| |
| chan = kzalloc(sizeof(struct hci_chan), GFP_KERNEL); |
| if (!chan) |
| return NULL; |
| |
| chan->conn = conn; |
| skb_queue_head_init(&chan->data_q); |
| |
| list_add_rcu(&chan->list, &conn->chan_list); |
| |
| return chan; |
| } |
| |
| int hci_chan_del(struct hci_chan *chan) |
| { |
| struct hci_conn *conn = chan->conn; |
| struct hci_dev *hdev = conn->hdev; |
| |
| BT_DBG("%s conn %p chan %p", hdev->name, conn, chan); |
| |
| list_del_rcu(&chan->list); |
| |
| synchronize_rcu(); |
| |
| skb_queue_purge(&chan->data_q); |
| kfree(chan); |
| |
| return 0; |
| } |
| |
| void hci_chan_list_flush(struct hci_conn *conn) |
| { |
| struct hci_chan *chan; |
| |
| BT_DBG("conn %p", conn); |
| |
| list_for_each_entry_rcu(chan, &conn->chan_list, list) |
| hci_chan_del(chan); |
| } |