Bluetooth: Enable 6LoWPAN support for BT LE devices
This is initial version of http://tools.ietf.org/html/draft-ietf-6lo-btle-00 By default the 6LoWPAN support is not activated and user needs to tweak /sys/kernel/debug/bluetooth/hci0/6lowpan file. The kernel needs IPv6 support before 6LoWPAN is usable. Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Jukka Rissanen
Marcel Holtmann
parent
e74bccb8a5
commit
18722c2470
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@ -131,6 +131,7 @@ enum {
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HCI_PERIODIC_INQ,
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HCI_PERIODIC_INQ,
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HCI_FAST_CONNECTABLE,
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HCI_FAST_CONNECTABLE,
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HCI_BREDR_ENABLED,
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HCI_BREDR_ENABLED,
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HCI_6LOWPAN_ENABLED,
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};
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};
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/* A mask for the flags that are supposed to remain when a reset happens
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/* A mask for the flags that are supposed to remain when a reset happens
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@ -448,6 +448,7 @@ enum {
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HCI_CONN_SSP_ENABLED,
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HCI_CONN_SSP_ENABLED,
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HCI_CONN_POWER_SAVE,
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HCI_CONN_POWER_SAVE,
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HCI_CONN_REMOTE_OOB,
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HCI_CONN_REMOTE_OOB,
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HCI_CONN_6LOWPAN,
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};
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};
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static inline bool hci_conn_ssp_enabled(struct hci_conn *conn)
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static inline bool hci_conn_ssp_enabled(struct hci_conn *conn)
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@ -136,6 +136,7 @@ struct l2cap_conninfo {
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#define L2CAP_FC_L2CAP 0x02
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#define L2CAP_FC_L2CAP 0x02
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#define L2CAP_FC_CONNLESS 0x04
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#define L2CAP_FC_CONNLESS 0x04
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#define L2CAP_FC_A2MP 0x08
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#define L2CAP_FC_A2MP 0x08
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#define L2CAP_FC_6LOWPAN 0x3e /* reserved and temporary value */
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/* L2CAP Control Field bit masks */
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/* L2CAP Control Field bit masks */
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#define L2CAP_CTRL_SAR 0xC000
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#define L2CAP_CTRL_SAR 0xC000
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@ -0,0 +1,886 @@
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/*
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Copyright (c) 2013 Intel Corp.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 and
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only version 2 as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include <linux/version.h>
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#include <linux/if_arp.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#include <net/af_ieee802154.h> /* to get the address type */
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/l2cap.h>
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#include "../ieee802154/6lowpan.h" /* for the compression support */
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#define IFACE_NAME_TEMPLATE "bt%d"
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#define EUI64_ADDR_LEN 8
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struct skb_cb {
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struct in6_addr addr;
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struct l2cap_conn *conn;
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};
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#define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
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/* The devices list contains those devices that we are acting
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* as a proxy. The BT 6LoWPAN device is a virtual device that
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* connects to the Bluetooth LE device. The real connection to
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* BT device is done via l2cap layer. There exists one
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* virtual device / one BT 6LoWPAN network (=hciX device).
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* The list contains struct lowpan_dev elements.
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*/
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static LIST_HEAD(bt_6lowpan_devices);
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static DEFINE_RWLOCK(devices_lock);
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struct lowpan_peer {
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struct list_head list;
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struct l2cap_conn *conn;
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/* peer addresses in various formats */
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unsigned char eui64_addr[EUI64_ADDR_LEN];
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struct in6_addr peer_addr;
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};
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struct lowpan_dev {
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struct list_head list;
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struct hci_dev *hdev;
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struct net_device *netdev;
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struct list_head peers;
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atomic_t peer_count; /* number of items in peers list */
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struct work_struct delete_netdev;
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struct delayed_work notify_peers;
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};
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static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev)
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{
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return netdev_priv(netdev);
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}
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static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer)
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{
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list_add(&peer->list, &dev->peers);
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atomic_inc(&dev->peer_count);
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}
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static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer)
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{
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list_del(&peer->list);
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if (atomic_dec_and_test(&dev->peer_count)) {
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BT_DBG("last peer");
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return true;
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}
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return false;
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}
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static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev,
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bdaddr_t *ba, __u8 type)
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{
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struct lowpan_peer *peer, *tmp;
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BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
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ba, type);
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list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
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BT_DBG("addr %pMR type %d",
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&peer->conn->hcon->dst, peer->conn->hcon->dst_type);
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if (bacmp(&peer->conn->hcon->dst, ba))
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continue;
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if (type == peer->conn->hcon->dst_type)
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return peer;
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}
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return NULL;
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}
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static inline struct lowpan_peer *peer_lookup_conn(struct lowpan_dev *dev,
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struct l2cap_conn *conn)
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{
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struct lowpan_peer *peer, *tmp;
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list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
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if (peer->conn == conn)
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return peer;
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}
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return NULL;
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}
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static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
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{
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struct lowpan_dev *entry, *tmp;
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struct lowpan_peer *peer = NULL;
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unsigned long flags;
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read_lock_irqsave(&devices_lock, flags);
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list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
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peer = peer_lookup_conn(entry, conn);
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if (peer)
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break;
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}
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read_unlock_irqrestore(&devices_lock, flags);
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return peer;
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}
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static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn)
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{
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struct lowpan_dev *entry, *tmp;
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struct lowpan_dev *dev = NULL;
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unsigned long flags;
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read_lock_irqsave(&devices_lock, flags);
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list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
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if (conn->hcon->hdev == entry->hdev) {
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dev = entry;
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break;
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}
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}
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read_unlock_irqrestore(&devices_lock, flags);
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return dev;
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}
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/* print data in line */
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static inline void raw_dump_inline(const char *caller, char *msg,
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unsigned char *buf, int len)
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{
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if (msg)
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pr_debug("%s():%s: ", caller, msg);
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print_hex_dump_debug("", DUMP_PREFIX_NONE,
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16, 1, buf, len, false);
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}
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/* print data in a table format:
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*
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* addr: xx xx xx xx xx xx
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* addr: xx xx xx xx xx xx
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* ...
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*/
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static inline void raw_dump_table(const char *caller, char *msg,
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unsigned char *buf, int len)
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{
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if (msg)
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pr_debug("%s():%s:\n", caller, msg);
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print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET,
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16, 1, buf, len, false);
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}
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static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
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{
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struct sk_buff *skb_cp;
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int ret;
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skb_cp = skb_copy(skb, GFP_ATOMIC);
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if (!skb_cp)
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return -ENOMEM;
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ret = netif_rx(skb_cp);
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BT_DBG("receive skb %d", ret);
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if (ret < 0)
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return NET_RX_DROP;
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return ret;
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}
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static int process_data(struct sk_buff *skb, struct net_device *netdev,
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struct l2cap_conn *conn)
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{
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const u8 *saddr, *daddr;
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u8 iphc0, iphc1;
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struct lowpan_dev *dev;
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struct lowpan_peer *peer;
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unsigned long flags;
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dev = lowpan_dev(netdev);
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read_lock_irqsave(&devices_lock, flags);
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peer = peer_lookup_conn(dev, conn);
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read_unlock_irqrestore(&devices_lock, flags);
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if (!peer)
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goto drop;
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saddr = peer->eui64_addr;
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daddr = dev->netdev->dev_addr;
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/* at least two bytes will be used for the encoding */
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if (skb->len < 2)
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goto drop;
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if (lowpan_fetch_skb_u8(skb, &iphc0))
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goto drop;
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if (lowpan_fetch_skb_u8(skb, &iphc1))
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goto drop;
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return lowpan_process_data(skb, netdev,
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saddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
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daddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
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iphc0, iphc1, give_skb_to_upper);
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drop:
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kfree_skb(skb);
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return -EINVAL;
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}
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static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
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struct l2cap_conn *conn)
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{
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struct sk_buff *local_skb;
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int ret;
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if (!netif_running(dev))
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goto drop;
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if (dev->type != ARPHRD_6LOWPAN)
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goto drop;
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/* check that it's our buffer */
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if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
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/* Copy the packet so that the IPv6 header is
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* properly aligned.
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*/
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local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
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skb_tailroom(skb), GFP_ATOMIC);
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if (!local_skb)
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goto drop;
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local_skb->protocol = htons(ETH_P_IPV6);
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local_skb->pkt_type = PACKET_HOST;
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skb_reset_network_header(local_skb);
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skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
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if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
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kfree_skb(local_skb);
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goto drop;
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}
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dev->stats.rx_bytes += skb->len;
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dev->stats.rx_packets++;
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kfree_skb(local_skb);
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kfree_skb(skb);
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} else {
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switch (skb->data[0] & 0xe0) {
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case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
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local_skb = skb_clone(skb, GFP_ATOMIC);
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if (!local_skb)
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goto drop;
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ret = process_data(local_skb, dev, conn);
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if (ret != NET_RX_SUCCESS)
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goto drop;
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dev->stats.rx_bytes += skb->len;
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dev->stats.rx_packets++;
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kfree_skb(skb);
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break;
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default:
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break;
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}
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}
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return NET_RX_SUCCESS;
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drop:
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kfree_skb(skb);
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return NET_RX_DROP;
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|
}
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|
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/* Packet from BT LE device */
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int bt_6lowpan_recv(struct l2cap_conn *conn, struct sk_buff *skb)
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|
{
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struct lowpan_dev *dev;
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struct lowpan_peer *peer;
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int err;
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peer = lookup_peer(conn);
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|
if (!peer)
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return -ENOENT;
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|
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dev = lookup_dev(conn);
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|
if (dev && !dev->netdev)
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return -ENOENT;
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err = recv_pkt(skb, dev->netdev, conn);
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|
BT_DBG("recv pkt %d", err);
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|
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|
return err;
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|
}
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|
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static inline int skbuff_copy(void *msg, int len, int count, int mtu,
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struct sk_buff *skb, struct net_device *dev)
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|
{
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struct sk_buff **frag;
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int sent = 0;
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memcpy(skb_put(skb, count), msg, count);
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|
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sent += count;
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msg += count;
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len -= count;
|
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|
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dev->stats.tx_bytes += count;
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dev->stats.tx_packets++;
|
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|
|
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|
raw_dump_table(__func__, "Sending", skb->data, skb->len);
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|
|
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|
/* Continuation fragments (no L2CAP header) */
|
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frag = &skb_shinfo(skb)->frag_list;
|
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|
while (len > 0) {
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struct sk_buff *tmp;
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|
|
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|
count = min_t(unsigned int, mtu, len);
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|
|
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|
tmp = bt_skb_alloc(count, GFP_ATOMIC);
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|
if (IS_ERR(tmp))
|
||||||
|
return PTR_ERR(tmp);
|
||||||
|
|
||||||
|
*frag = tmp;
|
||||||
|
|
||||||
|
memcpy(skb_put(*frag, count), msg, count);
|
||||||
|
|
||||||
|
raw_dump_table(__func__, "Sending fragment",
|
||||||
|
(*frag)->data, count);
|
||||||
|
|
||||||
|
(*frag)->priority = skb->priority;
|
||||||
|
|
||||||
|
sent += count;
|
||||||
|
msg += count;
|
||||||
|
len -= count;
|
||||||
|
|
||||||
|
skb->len += (*frag)->len;
|
||||||
|
skb->data_len += (*frag)->len;
|
||||||
|
|
||||||
|
frag = &(*frag)->next;
|
||||||
|
|
||||||
|
dev->stats.tx_bytes += count;
|
||||||
|
dev->stats.tx_packets++;
|
||||||
|
}
|
||||||
|
|
||||||
|
return sent;
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct sk_buff *create_pdu(struct l2cap_conn *conn, void *msg,
|
||||||
|
size_t len, u32 priority,
|
||||||
|
struct net_device *dev)
|
||||||
|
{
|
||||||
|
struct sk_buff *skb;
|
||||||
|
int err, count;
|
||||||
|
struct l2cap_hdr *lh;
|
||||||
|
|
||||||
|
/* FIXME: This mtu check should be not needed and atm is only used for
|
||||||
|
* testing purposes
|
||||||
|
*/
|
||||||
|
if (conn->mtu > (L2CAP_LE_MIN_MTU + L2CAP_HDR_SIZE))
|
||||||
|
conn->mtu = L2CAP_LE_MIN_MTU + L2CAP_HDR_SIZE;
|
||||||
|
|
||||||
|
count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
|
||||||
|
|
||||||
|
BT_DBG("conn %p len %zu mtu %d count %d", conn, len, conn->mtu, count);
|
||||||
|
|
||||||
|
skb = bt_skb_alloc(count + L2CAP_HDR_SIZE, GFP_ATOMIC);
|
||||||
|
if (IS_ERR(skb))
|
||||||
|
return skb;
|
||||||
|
|
||||||
|
skb->priority = priority;
|
||||||
|
|
||||||
|
lh = (struct l2cap_hdr *)skb_put(skb, L2CAP_HDR_SIZE);
|
||||||
|
lh->cid = cpu_to_le16(L2CAP_FC_6LOWPAN);
|
||||||
|
lh->len = cpu_to_le16(len);
|
||||||
|
|
||||||
|
err = skbuff_copy(msg, len, count, conn->mtu, skb, dev);
|
||||||
|
if (unlikely(err < 0)) {
|
||||||
|
kfree_skb(skb);
|
||||||
|
BT_DBG("skbuff copy %d failed", err);
|
||||||
|
return ERR_PTR(err);
|
||||||
|
}
|
||||||
|
|
||||||
|
return skb;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int conn_send(struct l2cap_conn *conn,
|
||||||
|
void *msg, size_t len, u32 priority,
|
||||||
|
struct net_device *dev)
|
||||||
|
{
|
||||||
|
struct sk_buff *skb;
|
||||||
|
|
||||||
|
skb = create_pdu(conn, msg, len, priority, dev);
|
||||||
|
if (IS_ERR(skb))
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
BT_DBG("conn %p skb %p len %d priority %u", conn, skb, skb->len,
|
||||||
|
skb->priority);
|
||||||
|
|
||||||
|
hci_send_acl(conn->hchan, skb, ACL_START);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void get_dest_bdaddr(struct in6_addr *ip6_daddr,
|
||||||
|
bdaddr_t *addr, u8 *addr_type)
|
||||||
|
{
|
||||||
|
u8 *eui64;
|
||||||
|
|
||||||
|
eui64 = ip6_daddr->s6_addr + 8;
|
||||||
|
|
||||||
|
addr->b[0] = eui64[7];
|
||||||
|
addr->b[1] = eui64[6];
|
||||||
|
addr->b[2] = eui64[5];
|
||||||
|
addr->b[3] = eui64[2];
|
||||||
|
addr->b[4] = eui64[1];
|
||||||
|
addr->b[5] = eui64[0];
|
||||||
|
|
||||||
|
addr->b[5] ^= 2;
|
||||||
|
|
||||||
|
/* Set universal/local bit to 0 */
|
||||||
|
if (addr->b[5] & 1) {
|
||||||
|
addr->b[5] &= ~1;
|
||||||
|
*addr_type = BDADDR_LE_PUBLIC;
|
||||||
|
} else {
|
||||||
|
*addr_type = BDADDR_LE_RANDOM;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static int header_create(struct sk_buff *skb, struct net_device *netdev,
|
||||||
|
unsigned short type, const void *_daddr,
|
||||||
|
const void *_saddr, unsigned int len)
|
||||||
|
{
|
||||||
|
struct ipv6hdr *hdr;
|
||||||
|
struct lowpan_dev *dev;
|
||||||
|
struct lowpan_peer *peer;
|
||||||
|
bdaddr_t addr, *any = BDADDR_ANY;
|
||||||
|
u8 *saddr, *daddr = any->b;
|
||||||
|
u8 addr_type;
|
||||||
|
|
||||||
|
if (type != ETH_P_IPV6)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
hdr = ipv6_hdr(skb);
|
||||||
|
|
||||||
|
dev = lowpan_dev(netdev);
|
||||||
|
|
||||||
|
if (ipv6_addr_is_multicast(&hdr->daddr)) {
|
||||||
|
memcpy(&lowpan_cb(skb)->addr, &hdr->daddr,
|
||||||
|
sizeof(struct in6_addr));
|
||||||
|
lowpan_cb(skb)->conn = NULL;
|
||||||
|
} else {
|
||||||
|
unsigned long flags;
|
||||||
|
|
||||||
|
/* Get destination BT device from skb.
|
||||||
|
* If there is no such peer then discard the packet.
|
||||||
|
*/
|
||||||
|
get_dest_bdaddr(&hdr->daddr, &addr, &addr_type);
|
||||||
|
|
||||||
|
BT_DBG("dest addr %pMR type %d", &addr, addr_type);
|
||||||
|
|
||||||
|
read_lock_irqsave(&devices_lock, flags);
|
||||||
|
peer = peer_lookup_ba(dev, &addr, addr_type);
|
||||||
|
read_unlock_irqrestore(&devices_lock, flags);
|
||||||
|
|
||||||
|
if (!peer) {
|
||||||
|
BT_DBG("no such peer %pMR found", &addr);
|
||||||
|
return -ENOENT;
|
||||||
|
}
|
||||||
|
|
||||||
|
daddr = peer->eui64_addr;
|
||||||
|
|
||||||
|
memcpy(&lowpan_cb(skb)->addr, &hdr->daddr,
|
||||||
|
sizeof(struct in6_addr));
|
||||||
|
lowpan_cb(skb)->conn = peer->conn;
|
||||||
|
}
|
||||||
|
|
||||||
|
saddr = dev->netdev->dev_addr;
|
||||||
|
|
||||||
|
return lowpan_header_compress(skb, netdev, type, daddr, saddr, len);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Packet to BT LE device */
|
||||||
|
static int send_pkt(struct l2cap_conn *conn, const void *saddr,
|
||||||
|
const void *daddr, struct sk_buff *skb,
|
||||||
|
struct net_device *netdev)
|
||||||
|
{
|
||||||
|
raw_dump_table(__func__, "raw skb data dump before fragmentation",
|
||||||
|
skb->data, skb->len);
|
||||||
|
|
||||||
|
return conn_send(conn, skb->data, skb->len, 0, netdev);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
|
||||||
|
{
|
||||||
|
struct sk_buff *local_skb;
|
||||||
|
struct lowpan_dev *entry, *tmp;
|
||||||
|
unsigned long flags;
|
||||||
|
|
||||||
|
read_lock_irqsave(&devices_lock, flags);
|
||||||
|
|
||||||
|
list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
|
||||||
|
struct lowpan_peer *pentry, *ptmp;
|
||||||
|
struct lowpan_dev *dev;
|
||||||
|
|
||||||
|
if (entry->netdev != netdev)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
dev = lowpan_dev(entry->netdev);
|
||||||
|
|
||||||
|
list_for_each_entry_safe(pentry, ptmp, &dev->peers, list) {
|
||||||
|
local_skb = skb_clone(skb, GFP_ATOMIC);
|
||||||
|
|
||||||
|
send_pkt(pentry->conn, netdev->dev_addr,
|
||||||
|
pentry->eui64_addr, local_skb, netdev);
|
||||||
|
|
||||||
|
kfree_skb(local_skb);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
read_unlock_irqrestore(&devices_lock, flags);
|
||||||
|
}
|
||||||
|
|
||||||
|
static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
|
||||||
|
{
|
||||||
|
int err = 0;
|
||||||
|
unsigned char *eui64_addr;
|
||||||
|
struct lowpan_dev *dev;
|
||||||
|
struct lowpan_peer *peer;
|
||||||
|
bdaddr_t addr;
|
||||||
|
u8 addr_type;
|
||||||
|
|
||||||
|
if (ipv6_addr_is_multicast(&lowpan_cb(skb)->addr)) {
|
||||||
|
/* We need to send the packet to every device
|
||||||
|
* behind this interface.
|
||||||
|
*/
|
||||||
|
send_mcast_pkt(skb, netdev);
|
||||||
|
} else {
|
||||||
|
unsigned long flags;
|
||||||
|
|
||||||
|
get_dest_bdaddr(&lowpan_cb(skb)->addr, &addr, &addr_type);
|
||||||
|
eui64_addr = lowpan_cb(skb)->addr.s6_addr + 8;
|
||||||
|
dev = lowpan_dev(netdev);
|
||||||
|
|
||||||
|
read_lock_irqsave(&devices_lock, flags);
|
||||||
|
peer = peer_lookup_ba(dev, &addr, addr_type);
|
||||||
|
read_unlock_irqrestore(&devices_lock, flags);
|
||||||
|
|
||||||
|
BT_DBG("xmit from %s to %pMR (%pI6c) peer %p", netdev->name,
|
||||||
|
&addr, &lowpan_cb(skb)->addr, peer);
|
||||||
|
|
||||||
|
if (peer && peer->conn)
|
||||||
|
err = send_pkt(peer->conn, netdev->dev_addr,
|
||||||
|
eui64_addr, skb, netdev);
|
||||||
|
}
|
||||||
|
dev_kfree_skb(skb);
|
||||||
|
|
||||||
|
if (err)
|
||||||
|
BT_DBG("ERROR: xmit failed (%d)", err);
|
||||||
|
|
||||||
|
return (err < 0) ? NET_XMIT_DROP : err;
|
||||||
|
}
|
||||||
|
|
||||||
|
static const struct net_device_ops netdev_ops = {
|
||||||
|
.ndo_start_xmit = bt_xmit,
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct header_ops header_ops = {
|
||||||
|
.create = header_create,
|
||||||
|
};
|
||||||
|
|
||||||
|
static void netdev_setup(struct net_device *dev)
|
||||||
|
{
|
||||||
|
dev->addr_len = EUI64_ADDR_LEN;
|
||||||
|
dev->type = ARPHRD_6LOWPAN;
|
||||||
|
|
||||||
|
dev->hard_header_len = 0;
|
||||||
|
dev->needed_tailroom = 0;
|
||||||
|
dev->mtu = IPV6_MIN_MTU;
|
||||||
|
dev->tx_queue_len = 0;
|
||||||
|
dev->flags = IFF_RUNNING | IFF_POINTOPOINT;
|
||||||
|
dev->watchdog_timeo = 0;
|
||||||
|
|
||||||
|
dev->netdev_ops = &netdev_ops;
|
||||||
|
dev->header_ops = &header_ops;
|
||||||
|
dev->destructor = free_netdev;
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct device_type bt_type = {
|
||||||
|
.name = "bluetooth",
|
||||||
|
};
|
||||||
|
|
||||||
|
static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
|
||||||
|
{
|
||||||
|
/* addr is the BT address in little-endian format */
|
||||||
|
eui[0] = addr[5];
|
||||||
|
eui[1] = addr[4];
|
||||||
|
eui[2] = addr[3];
|
||||||
|
eui[3] = 0xFF;
|
||||||
|
eui[4] = 0xFE;
|
||||||
|
eui[5] = addr[2];
|
||||||
|
eui[6] = addr[1];
|
||||||
|
eui[7] = addr[0];
|
||||||
|
|
||||||
|
eui[0] ^= 2;
|
||||||
|
|
||||||
|
/* Universal/local bit set, RFC 4291 */
|
||||||
|
if (addr_type == BDADDR_LE_PUBLIC)
|
||||||
|
eui[0] |= 1;
|
||||||
|
else
|
||||||
|
eui[0] &= ~1;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr,
|
||||||
|
u8 addr_type)
|
||||||
|
{
|
||||||
|
netdev->addr_assign_type = NET_ADDR_PERM;
|
||||||
|
set_addr(netdev->dev_addr, addr->b, addr_type);
|
||||||
|
netdev->dev_addr[0] ^= 2;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void ifup(struct net_device *netdev)
|
||||||
|
{
|
||||||
|
int err;
|
||||||
|
|
||||||
|
rtnl_lock();
|
||||||
|
err = dev_open(netdev);
|
||||||
|
if (err < 0)
|
||||||
|
BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
|
||||||
|
rtnl_unlock();
|
||||||
|
}
|
||||||
|
|
||||||
|
static void do_notify_peers(struct work_struct *work)
|
||||||
|
{
|
||||||
|
struct lowpan_dev *dev = container_of(work, struct lowpan_dev,
|
||||||
|
notify_peers.work);
|
||||||
|
|
||||||
|
netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
|
||||||
|
}
|
||||||
|
|
||||||
|
static bool is_bt_6lowpan(struct hci_conn *hcon)
|
||||||
|
{
|
||||||
|
if (hcon->type != LE_LINK)
|
||||||
|
return false;
|
||||||
|
|
||||||
|
return test_bit(HCI_CONN_6LOWPAN, &hcon->flags);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int add_peer_conn(struct l2cap_conn *conn, struct lowpan_dev *dev)
|
||||||
|
{
|
||||||
|
struct lowpan_peer *peer;
|
||||||
|
unsigned long flags;
|
||||||
|
|
||||||
|
peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
|
||||||
|
if (!peer)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
peer->conn = conn;
|
||||||
|
memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
|
||||||
|
|
||||||
|
/* RFC 2464 ch. 5 */
|
||||||
|
peer->peer_addr.s6_addr[0] = 0xFE;
|
||||||
|
peer->peer_addr.s6_addr[1] = 0x80;
|
||||||
|
set_addr((u8 *)&peer->peer_addr.s6_addr + 8, conn->hcon->dst.b,
|
||||||
|
conn->hcon->dst_type);
|
||||||
|
|
||||||
|
memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
|
||||||
|
EUI64_ADDR_LEN);
|
||||||
|
peer->eui64_addr[0] ^= 2; /* second bit-flip (Universe/Local)
|
||||||
|
* is done according RFC2464
|
||||||
|
*/
|
||||||
|
|
||||||
|
raw_dump_inline(__func__, "peer IPv6 address",
|
||||||
|
(unsigned char *)&peer->peer_addr, 16);
|
||||||
|
raw_dump_inline(__func__, "peer EUI64 address", peer->eui64_addr, 8);
|
||||||
|
|
||||||
|
write_lock_irqsave(&devices_lock, flags);
|
||||||
|
INIT_LIST_HEAD(&peer->list);
|
||||||
|
peer_add(dev, peer);
|
||||||
|
write_unlock_irqrestore(&devices_lock, flags);
|
||||||
|
|
||||||
|
/* Notifying peers about us needs to be done without locks held */
|
||||||
|
INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
|
||||||
|
schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* This gets called when BT LE 6LoWPAN device is connected. We then
|
||||||
|
* create network device that acts as a proxy between BT LE device
|
||||||
|
* and kernel network stack.
|
||||||
|
*/
|
||||||
|
int bt_6lowpan_add_conn(struct l2cap_conn *conn)
|
||||||
|
{
|
||||||
|
struct lowpan_peer *peer = NULL;
|
||||||
|
struct lowpan_dev *dev;
|
||||||
|
struct net_device *netdev;
|
||||||
|
int err = 0;
|
||||||
|
unsigned long flags;
|
||||||
|
|
||||||
|
if (!is_bt_6lowpan(conn->hcon))
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
peer = lookup_peer(conn);
|
||||||
|
if (peer)
|
||||||
|
return -EEXIST;
|
||||||
|
|
||||||
|
dev = lookup_dev(conn);
|
||||||
|
if (dev)
|
||||||
|
return add_peer_conn(conn, dev);
|
||||||
|
|
||||||
|
netdev = alloc_netdev(sizeof(*dev), IFACE_NAME_TEMPLATE, netdev_setup);
|
||||||
|
if (!netdev)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
set_dev_addr(netdev, &conn->hcon->src, conn->hcon->src_type);
|
||||||
|
|
||||||
|
netdev->netdev_ops = &netdev_ops;
|
||||||
|
SET_NETDEV_DEV(netdev, &conn->hcon->dev);
|
||||||
|
SET_NETDEV_DEVTYPE(netdev, &bt_type);
|
||||||
|
|
||||||
|
err = register_netdev(netdev);
|
||||||
|
if (err < 0) {
|
||||||
|
BT_INFO("register_netdev failed %d", err);
|
||||||
|
free_netdev(netdev);
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
BT_DBG("ifindex %d peer bdaddr %pMR my addr %pMR",
|
||||||
|
netdev->ifindex, &conn->hcon->dst, &conn->hcon->src);
|
||||||
|
set_bit(__LINK_STATE_PRESENT, &netdev->state);
|
||||||
|
|
||||||
|
dev = netdev_priv(netdev);
|
||||||
|
dev->netdev = netdev;
|
||||||
|
dev->hdev = conn->hcon->hdev;
|
||||||
|
INIT_LIST_HEAD(&dev->peers);
|
||||||
|
|
||||||
|
write_lock_irqsave(&devices_lock, flags);
|
||||||
|
INIT_LIST_HEAD(&dev->list);
|
||||||
|
list_add(&dev->list, &bt_6lowpan_devices);
|
||||||
|
write_unlock_irqrestore(&devices_lock, flags);
|
||||||
|
|
||||||
|
ifup(netdev);
|
||||||
|
|
||||||
|
return add_peer_conn(conn, dev);
|
||||||
|
|
||||||
|
out:
|
||||||
|
return err;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void delete_netdev(struct work_struct *work)
|
||||||
|
{
|
||||||
|
struct lowpan_dev *entry = container_of(work, struct lowpan_dev,
|
||||||
|
delete_netdev);
|
||||||
|
|
||||||
|
unregister_netdev(entry->netdev);
|
||||||
|
|
||||||
|
/* The entry pointer is deleted in device_event() */
|
||||||
|
}
|
||||||
|
|
||||||
|
int bt_6lowpan_del_conn(struct l2cap_conn *conn)
|
||||||
|
{
|
||||||
|
struct lowpan_dev *entry, *tmp;
|
||||||
|
struct lowpan_dev *dev = NULL;
|
||||||
|
struct lowpan_peer *peer;
|
||||||
|
int err = -ENOENT;
|
||||||
|
unsigned long flags;
|
||||||
|
bool last = false;
|
||||||
|
|
||||||
|
if (!is_bt_6lowpan(conn->hcon))
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
write_lock_irqsave(&devices_lock, flags);
|
||||||
|
|
||||||
|
list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
|
||||||
|
dev = lowpan_dev(entry->netdev);
|
||||||
|
peer = peer_lookup_conn(dev, conn);
|
||||||
|
if (peer) {
|
||||||
|
last = peer_del(dev, peer);
|
||||||
|
err = 0;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!err && last && dev && !atomic_read(&dev->peer_count)) {
|
||||||
|
write_unlock_irqrestore(&devices_lock, flags);
|
||||||
|
|
||||||
|
cancel_delayed_work_sync(&dev->notify_peers);
|
||||||
|
|
||||||
|
/* bt_6lowpan_del_conn() is called with hci dev lock held which
|
||||||
|
* means that we must delete the netdevice in worker thread.
|
||||||
|
*/
|
||||||
|
INIT_WORK(&entry->delete_netdev, delete_netdev);
|
||||||
|
schedule_work(&entry->delete_netdev);
|
||||||
|
} else {
|
||||||
|
write_unlock_irqrestore(&devices_lock, flags);
|
||||||
|
}
|
||||||
|
|
||||||
|
return err;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int device_event(struct notifier_block *unused,
|
||||||
|
unsigned long event, void *ptr)
|
||||||
|
{
|
||||||
|
struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
|
||||||
|
struct lowpan_dev *entry, *tmp;
|
||||||
|
unsigned long flags;
|
||||||
|
|
||||||
|
if (netdev->type != ARPHRD_6LOWPAN)
|
||||||
|
return NOTIFY_DONE;
|
||||||
|
|
||||||
|
switch (event) {
|
||||||
|
case NETDEV_UNREGISTER:
|
||||||
|
write_lock_irqsave(&devices_lock, flags);
|
||||||
|
list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices,
|
||||||
|
list) {
|
||||||
|
if (entry->netdev == netdev) {
|
||||||
|
list_del(&entry->list);
|
||||||
|
kfree(entry);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
write_unlock_irqrestore(&devices_lock, flags);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
return NOTIFY_DONE;
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct notifier_block bt_6lowpan_dev_notifier = {
|
||||||
|
.notifier_call = device_event,
|
||||||
|
};
|
||||||
|
|
||||||
|
int bt_6lowpan_init(void)
|
||||||
|
{
|
||||||
|
return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
|
||||||
|
}
|
||||||
|
|
||||||
|
void bt_6lowpan_cleanup(void)
|
||||||
|
{
|
||||||
|
unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,26 @@
|
||||||
|
/*
|
||||||
|
Copyright (c) 2013 Intel Corp.
|
||||||
|
|
||||||
|
This program is free software; you can redistribute it and/or modify
|
||||||
|
it under the terms of the GNU General Public License version 2 and
|
||||||
|
only version 2 as published by the Free Software Foundation.
|
||||||
|
|
||||||
|
This program is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
GNU General Public License for more details.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __6LOWPAN_H
|
||||||
|
#define __6LOWPAN_H
|
||||||
|
|
||||||
|
#include <linux/skbuff.h>
|
||||||
|
#include <net/bluetooth/l2cap.h>
|
||||||
|
|
||||||
|
int bt_6lowpan_recv(struct l2cap_conn *conn, struct sk_buff *skb);
|
||||||
|
int bt_6lowpan_add_conn(struct l2cap_conn *conn);
|
||||||
|
int bt_6lowpan_del_conn(struct l2cap_conn *conn);
|
||||||
|
int bt_6lowpan_init(void);
|
||||||
|
void bt_6lowpan_cleanup(void);
|
||||||
|
|
||||||
|
#endif /* __6LOWPAN_H */
|
||||||
|
|
@ -10,6 +10,10 @@ obj-$(CONFIG_BT_HIDP) += hidp/
|
||||||
|
|
||||||
bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o \
|
bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o \
|
||||||
hci_sock.o hci_sysfs.o l2cap_core.o l2cap_sock.o smp.o sco.o lib.o \
|
hci_sock.o hci_sysfs.o l2cap_core.o l2cap_sock.o smp.o sco.o lib.o \
|
||||||
a2mp.o amp.o
|
a2mp.o amp.o 6lowpan.o
|
||||||
|
|
||||||
|
ifeq ($(CONFIG_IEEE802154_6LOWPAN),)
|
||||||
|
bluetooth-y += ../ieee802154/6lowpan_iphc.o
|
||||||
|
endif
|
||||||
|
|
||||||
subdir-ccflags-y += -D__CHECK_ENDIAN__
|
subdir-ccflags-y += -D__CHECK_ENDIAN__
|
||||||
|
|
|
||||||
|
|
@ -3533,6 +3533,9 @@ static void hci_le_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
|
||||||
conn->handle = __le16_to_cpu(ev->handle);
|
conn->handle = __le16_to_cpu(ev->handle);
|
||||||
conn->state = BT_CONNECTED;
|
conn->state = BT_CONNECTED;
|
||||||
|
|
||||||
|
if (test_bit(HCI_6LOWPAN_ENABLED, &hdev->dev_flags))
|
||||||
|
set_bit(HCI_CONN_6LOWPAN, &conn->flags);
|
||||||
|
|
||||||
hci_conn_add_sysfs(conn);
|
hci_conn_add_sysfs(conn);
|
||||||
|
|
||||||
hci_proto_connect_cfm(conn, ev->status);
|
hci_proto_connect_cfm(conn, ev->status);
|
||||||
|
|
|
||||||
|
|
@ -40,6 +40,7 @@
|
||||||
#include "smp.h"
|
#include "smp.h"
|
||||||
#include "a2mp.h"
|
#include "a2mp.h"
|
||||||
#include "amp.h"
|
#include "amp.h"
|
||||||
|
#include "6lowpan.h"
|
||||||
|
|
||||||
bool disable_ertm;
|
bool disable_ertm;
|
||||||
|
|
||||||
|
|
@ -1468,6 +1469,8 @@ static void l2cap_le_conn_ready(struct l2cap_conn *conn)
|
||||||
|
|
||||||
BT_DBG("");
|
BT_DBG("");
|
||||||
|
|
||||||
|
bt_6lowpan_add_conn(conn);
|
||||||
|
|
||||||
/* Check if we have socket listening on cid */
|
/* Check if we have socket listening on cid */
|
||||||
pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
|
pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
|
||||||
&hcon->src, &hcon->dst);
|
&hcon->src, &hcon->dst);
|
||||||
|
|
@ -7119,6 +7122,10 @@ static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
|
||||||
l2cap_conn_del(conn->hcon, EACCES);
|
l2cap_conn_del(conn->hcon, EACCES);
|
||||||
break;
|
break;
|
||||||
|
|
||||||
|
case L2CAP_FC_6LOWPAN:
|
||||||
|
bt_6lowpan_recv(conn, skb);
|
||||||
|
break;
|
||||||
|
|
||||||
default:
|
default:
|
||||||
l2cap_data_channel(conn, cid, skb);
|
l2cap_data_channel(conn, cid, skb);
|
||||||
break;
|
break;
|
||||||
|
|
@ -7186,6 +7193,8 @@ void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
|
||||||
{
|
{
|
||||||
BT_DBG("hcon %p reason %d", hcon, reason);
|
BT_DBG("hcon %p reason %d", hcon, reason);
|
||||||
|
|
||||||
|
bt_6lowpan_del_conn(hcon->l2cap_data);
|
||||||
|
|
||||||
l2cap_conn_del(hcon, bt_to_errno(reason));
|
l2cap_conn_del(hcon, bt_to_errno(reason));
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
@ -7467,11 +7476,14 @@ int __init l2cap_init(void)
|
||||||
debugfs_create_u16("l2cap_le_default_mps", 0466, bt_debugfs,
|
debugfs_create_u16("l2cap_le_default_mps", 0466, bt_debugfs,
|
||||||
&le_default_mps);
|
&le_default_mps);
|
||||||
|
|
||||||
|
bt_6lowpan_init();
|
||||||
|
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
void l2cap_exit(void)
|
void l2cap_exit(void)
|
||||||
{
|
{
|
||||||
|
bt_6lowpan_cleanup();
|
||||||
debugfs_remove(l2cap_debugfs);
|
debugfs_remove(l2cap_debugfs);
|
||||||
l2cap_cleanup_sockets();
|
l2cap_cleanup_sockets();
|
||||||
}
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue