![Tom Gundersen](/assets/img/avatar_default.png)
Extend alloc_netdev{,_mq{,s}}() to take name_assign_type as argument, and convert all users to pass NET_NAME_UNKNOWN. Coccinelle patch: @@ expression sizeof_priv, name, setup, txqs, rxqs, count; @@ ( -alloc_netdev_mqs(sizeof_priv, name, setup, txqs, rxqs) +alloc_netdev_mqs(sizeof_priv, name, NET_NAME_UNKNOWN, setup, txqs, rxqs) | -alloc_netdev_mq(sizeof_priv, name, setup, count) +alloc_netdev_mq(sizeof_priv, name, NET_NAME_UNKNOWN, setup, count) | -alloc_netdev(sizeof_priv, name, setup) +alloc_netdev(sizeof_priv, name, NET_NAME_UNKNOWN, setup) ) v9: move comments here from the wrong commit Signed-off-by: Tom Gundersen <teg@jklm.no> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1307 lines
28 KiB
C
1307 lines
28 KiB
C
/*
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Copyright (c) 2013-2014 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/if_arp.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/module.h>
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#include <linux/debugfs.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 <net/6lowpan.h> /* for the compression support */
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#define VERSION "0.1"
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static struct dentry *lowpan_psm_debugfs;
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static struct dentry *lowpan_control_debugfs;
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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_chan *chan;
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int status;
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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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/* If psm is set to 0 (default value), then 6lowpan is disabled.
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* Other values are used to indicate a Protocol Service Multiplexer
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* value for 6lowpan.
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*/
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static u16 psm_6lowpan;
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/* We are listening incoming connections via this channel
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*/
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static struct l2cap_chan *listen_chan;
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struct lowpan_peer {
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struct list_head list;
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struct l2cap_chan *chan;
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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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module_put(THIS_MODULE);
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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("dst addr %pMR dst type %d",
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&peer->chan->dst, peer->chan->dst_type);
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if (bacmp(&peer->chan->dst, ba))
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continue;
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if (type == peer->chan->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_chan(struct lowpan_dev *dev,
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struct l2cap_chan *chan)
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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->chan == chan)
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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->chan->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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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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if (ret < 0) {
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BT_DBG("receive skb %d", ret);
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return NET_RX_DROP;
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}
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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_chan *chan)
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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_chan(dev, chan);
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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_chan *chan)
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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, chan);
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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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dev->stats.rx_dropped++;
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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/* Packet from BT LE device */
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static int chan_recv_cb(struct l2cap_chan *chan, 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(chan->conn);
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if (!peer)
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return -ENOENT;
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dev = lookup_dev(chan->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, chan);
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if (err) {
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BT_DBG("recv pkt %d", err);
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err = -EAGAIN;
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}
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return err;
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}
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static u8 get_addr_type_from_eui64(u8 byte)
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{
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/* Is universal(0) or local(1) bit */
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return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
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}
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static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
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{
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u8 *eui64 = ip6_daddr->s6_addr + 8;
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addr->b[0] = eui64[7];
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addr->b[1] = eui64[6];
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addr->b[2] = eui64[5];
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addr->b[3] = eui64[2];
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addr->b[4] = eui64[1];
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addr->b[5] = eui64[0];
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}
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static void convert_dest_bdaddr(struct in6_addr *ip6_daddr,
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bdaddr_t *addr, u8 *addr_type)
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{
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copy_to_bdaddr(ip6_daddr, addr);
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/* We need to toggle the U/L bit that we got from IPv6 address
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* so that we get the proper address and type of the BD address.
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*/
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addr->b[5] ^= 0x02;
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*addr_type = get_addr_type_from_eui64(addr->b[5]);
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}
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static int header_create(struct sk_buff *skb, struct net_device *netdev,
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unsigned short type, const void *_daddr,
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const void *_saddr, unsigned int len)
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{
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struct ipv6hdr *hdr;
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struct lowpan_dev *dev;
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struct lowpan_peer *peer;
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bdaddr_t addr, *any = BDADDR_ANY;
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u8 *saddr, *daddr = any->b;
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u8 addr_type;
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if (type != ETH_P_IPV6)
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return -EINVAL;
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hdr = ipv6_hdr(skb);
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dev = lowpan_dev(netdev);
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if (ipv6_addr_is_multicast(&hdr->daddr)) {
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memcpy(&lowpan_cb(skb)->addr, &hdr->daddr,
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sizeof(struct in6_addr));
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lowpan_cb(skb)->chan = NULL;
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} else {
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unsigned long flags;
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/* Get destination BT device from skb.
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* If there is no such peer then discard the packet.
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*/
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convert_dest_bdaddr(&hdr->daddr, &addr, &addr_type);
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BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
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addr_type, &hdr->daddr);
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read_lock_irqsave(&devices_lock, flags);
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peer = peer_lookup_ba(dev, &addr, addr_type);
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read_unlock_irqrestore(&devices_lock, flags);
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if (!peer) {
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BT_DBG("no such peer %pMR found", &addr);
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return -ENOENT;
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}
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daddr = peer->eui64_addr;
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memcpy(&lowpan_cb(skb)->addr, &hdr->daddr,
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sizeof(struct in6_addr));
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lowpan_cb(skb)->chan = peer->chan;
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}
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saddr = dev->netdev->dev_addr;
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return lowpan_header_compress(skb, netdev, type, daddr, saddr, len);
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}
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/* Packet to BT LE device */
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static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
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struct net_device *netdev)
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{
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struct msghdr msg;
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struct kvec iv;
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int err;
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/* Remember the skb so that we can send EAGAIN to the caller if
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* we run out of credits.
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*/
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chan->data = skb;
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memset(&msg, 0, sizeof(msg));
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msg.msg_iov = (struct iovec *) &iv;
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msg.msg_iovlen = 1;
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iv.iov_base = skb->data;
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iv.iov_len = skb->len;
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err = l2cap_chan_send(chan, &msg, skb->len);
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if (err > 0) {
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netdev->stats.tx_bytes += err;
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netdev->stats.tx_packets++;
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return 0;
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}
|
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|
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if (!err)
|
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err = lowpan_cb(skb)->status;
|
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|
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if (err < 0) {
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if (err == -EAGAIN)
|
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netdev->stats.tx_dropped++;
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else
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netdev->stats.tx_errors++;
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}
|
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|
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return err;
|
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}
|
|
|
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static void send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
|
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{
|
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struct sk_buff *local_skb;
|
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struct lowpan_dev *entry, *tmp;
|
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unsigned long flags;
|
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|
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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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struct lowpan_peer *pentry, *ptmp;
|
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struct lowpan_dev *dev;
|
|
|
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if (entry->netdev != netdev)
|
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continue;
|
|
|
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dev = lowpan_dev(entry->netdev);
|
|
|
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list_for_each_entry_safe(pentry, ptmp, &dev->peers, list) {
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local_skb = skb_clone(skb, GFP_ATOMIC);
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|
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send_pkt(pentry->chan, local_skb, netdev);
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|
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kfree_skb(local_skb);
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}
|
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}
|
|
|
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read_unlock_irqrestore(&devices_lock, flags);
|
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}
|
|
|
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static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
|
|
{
|
|
int err = 0;
|
|
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
|
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* behind this interface.
|
|
*/
|
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send_mcast_pkt(skb, netdev);
|
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} else {
|
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unsigned long flags;
|
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|
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convert_dest_bdaddr(&lowpan_cb(skb)->addr, &addr, &addr_type);
|
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dev = lowpan_dev(netdev);
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|
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read_lock_irqsave(&devices_lock, flags);
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peer = peer_lookup_ba(dev, &addr, addr_type);
|
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read_unlock_irqrestore(&devices_lock, flags);
|
|
|
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BT_DBG("xmit %s to %pMR type %d IP %pI6c peer %p",
|
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netdev->name, &addr, addr_type,
|
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&lowpan_cb(skb)->addr, peer);
|
|
|
|
if (peer && peer->chan)
|
|
err = send_pkt(peer->chan, skb, netdev);
|
|
else
|
|
err = -ENOENT;
|
|
}
|
|
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];
|
|
|
|
/* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
|
|
if (addr_type == BDADDR_LE_PUBLIC)
|
|
eui[0] &= ~0x02;
|
|
else
|
|
eui[0] |= 0x02;
|
|
|
|
BT_DBG("type %d addr %*phC", addr_type, 8, eui);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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 ifdown(struct net_device *netdev)
|
|
{
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = dev_close(netdev);
|
|
if (err < 0)
|
|
BT_INFO("iface %s cannot be closed (%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;
|
|
|
|
if (!psm_6lowpan)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static struct l2cap_chan *chan_create(void)
|
|
{
|
|
struct l2cap_chan *chan;
|
|
|
|
chan = l2cap_chan_create();
|
|
if (!chan)
|
|
return NULL;
|
|
|
|
l2cap_chan_set_defaults(chan);
|
|
|
|
chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
|
|
chan->mode = L2CAP_MODE_LE_FLOWCTL;
|
|
chan->omtu = 65535;
|
|
chan->imtu = chan->omtu;
|
|
|
|
return chan;
|
|
}
|
|
|
|
static struct l2cap_chan *chan_open(struct l2cap_chan *pchan)
|
|
{
|
|
struct l2cap_chan *chan;
|
|
|
|
chan = chan_create();
|
|
if (!chan)
|
|
return NULL;
|
|
|
|
chan->remote_mps = chan->omtu;
|
|
chan->mps = chan->omtu;
|
|
|
|
chan->state = BT_CONNECTED;
|
|
|
|
return chan;
|
|
}
|
|
|
|
static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
|
|
struct lowpan_dev *dev)
|
|
{
|
|
struct lowpan_peer *peer;
|
|
unsigned long flags;
|
|
|
|
peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
|
|
if (!peer)
|
|
return NULL;
|
|
|
|
peer->chan = chan;
|
|
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, chan->dst.b,
|
|
chan->dst_type);
|
|
|
|
memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
|
|
EUI64_ADDR_LEN);
|
|
|
|
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 peer->chan;
|
|
}
|
|
|
|
static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
|
|
{
|
|
struct net_device *netdev;
|
|
int err = 0;
|
|
unsigned long flags;
|
|
|
|
netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE,
|
|
NET_NAME_UNKNOWN, netdev_setup);
|
|
if (!netdev)
|
|
return -ENOMEM;
|
|
|
|
set_dev_addr(netdev, &chan->src, chan->src_type);
|
|
|
|
netdev->netdev_ops = &netdev_ops;
|
|
SET_NETDEV_DEV(netdev, &chan->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 type %d my addr %pMR type %d",
|
|
netdev->ifindex, &chan->dst, chan->dst_type,
|
|
&chan->src, chan->src_type);
|
|
set_bit(__LINK_STATE_PRESENT, &netdev->state);
|
|
|
|
*dev = netdev_priv(netdev);
|
|
(*dev)->netdev = netdev;
|
|
(*dev)->hdev = chan->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);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static inline void chan_ready_cb(struct l2cap_chan *chan)
|
|
{
|
|
struct lowpan_dev *dev;
|
|
|
|
dev = lookup_dev(chan->conn);
|
|
|
|
BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
|
|
|
|
if (!dev) {
|
|
if (setup_netdev(chan, &dev) < 0) {
|
|
l2cap_chan_del(chan, -ENOENT);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
return;
|
|
|
|
add_peer_chan(chan, dev);
|
|
ifup(dev->netdev);
|
|
}
|
|
|
|
static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *chan)
|
|
{
|
|
struct l2cap_chan *pchan;
|
|
|
|
pchan = chan_open(chan);
|
|
pchan->ops = chan->ops;
|
|
|
|
BT_DBG("chan %p pchan %p", chan, pchan);
|
|
|
|
return pchan;
|
|
}
|
|
|
|
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() */
|
|
}
|
|
|
|
static void chan_close_cb(struct l2cap_chan *chan)
|
|
{
|
|
struct lowpan_dev *entry, *tmp;
|
|
struct lowpan_dev *dev = NULL;
|
|
struct lowpan_peer *peer;
|
|
int err = -ENOENT;
|
|
unsigned long flags;
|
|
bool last = false, removed = true;
|
|
|
|
BT_DBG("chan %p conn %p", chan, chan->conn);
|
|
|
|
if (chan->conn && chan->conn->hcon) {
|
|
if (!is_bt_6lowpan(chan->conn->hcon))
|
|
return;
|
|
|
|
/* If conn is set, then the netdev is also there and we should
|
|
* not remove it.
|
|
*/
|
|
removed = false;
|
|
}
|
|
|
|
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_chan(dev, chan);
|
|
if (peer) {
|
|
last = peer_del(dev, peer);
|
|
err = 0;
|
|
|
|
BT_DBG("dev %p removing %speer %p", dev,
|
|
last ? "last " : "1 ", peer);
|
|
BT_DBG("chan %p orig refcnt %d", chan,
|
|
atomic_read(&chan->kref.refcount));
|
|
|
|
l2cap_chan_put(chan);
|
|
kfree(peer);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!err && last && dev && !atomic_read(&dev->peer_count)) {
|
|
write_unlock_irqrestore(&devices_lock, flags);
|
|
|
|
cancel_delayed_work_sync(&dev->notify_peers);
|
|
|
|
ifdown(dev->netdev);
|
|
|
|
if (!removed) {
|
|
INIT_WORK(&entry->delete_netdev, delete_netdev);
|
|
schedule_work(&entry->delete_netdev);
|
|
}
|
|
} else {
|
|
write_unlock_irqrestore(&devices_lock, flags);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
|
|
{
|
|
BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
|
|
state_to_string(state), err);
|
|
}
|
|
|
|
static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
|
|
unsigned long hdr_len,
|
|
unsigned long len, int nb)
|
|
{
|
|
/* Note that we must allocate using GFP_ATOMIC here as
|
|
* this function is called originally from netdev hard xmit
|
|
* function in atomic context.
|
|
*/
|
|
return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
|
|
}
|
|
|
|
static void chan_suspend_cb(struct l2cap_chan *chan)
|
|
{
|
|
struct sk_buff *skb = chan->data;
|
|
|
|
BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
|
|
|
|
lowpan_cb(skb)->status = -EAGAIN;
|
|
}
|
|
|
|
static void chan_resume_cb(struct l2cap_chan *chan)
|
|
{
|
|
struct sk_buff *skb = chan->data;
|
|
|
|
BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
|
|
|
|
lowpan_cb(skb)->status = 0;
|
|
}
|
|
|
|
static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
|
|
{
|
|
return msecs_to_jiffies(1000);
|
|
}
|
|
|
|
static const struct l2cap_ops bt_6lowpan_chan_ops = {
|
|
.name = "L2CAP 6LoWPAN channel",
|
|
.new_connection = chan_new_conn_cb,
|
|
.recv = chan_recv_cb,
|
|
.close = chan_close_cb,
|
|
.state_change = chan_state_change_cb,
|
|
.ready = chan_ready_cb,
|
|
.resume = chan_resume_cb,
|
|
.suspend = chan_suspend_cb,
|
|
.get_sndtimeo = chan_get_sndtimeo_cb,
|
|
.alloc_skb = chan_alloc_skb_cb,
|
|
.memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec,
|
|
|
|
.teardown = l2cap_chan_no_teardown,
|
|
.defer = l2cap_chan_no_defer,
|
|
.set_shutdown = l2cap_chan_no_set_shutdown,
|
|
};
|
|
|
|
static inline __u8 bdaddr_type(__u8 type)
|
|
{
|
|
if (type == ADDR_LE_DEV_PUBLIC)
|
|
return BDADDR_LE_PUBLIC;
|
|
else
|
|
return BDADDR_LE_RANDOM;
|
|
}
|
|
|
|
static struct l2cap_chan *chan_get(void)
|
|
{
|
|
struct l2cap_chan *pchan;
|
|
|
|
pchan = chan_create();
|
|
if (!pchan)
|
|
return NULL;
|
|
|
|
pchan->ops = &bt_6lowpan_chan_ops;
|
|
|
|
return pchan;
|
|
}
|
|
|
|
static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
|
|
{
|
|
struct l2cap_chan *pchan;
|
|
int err;
|
|
|
|
pchan = chan_get();
|
|
if (!pchan)
|
|
return -EINVAL;
|
|
|
|
err = l2cap_chan_connect(pchan, cpu_to_le16(psm_6lowpan), 0,
|
|
addr, dst_type);
|
|
|
|
BT_DBG("chan %p err %d", pchan, err);
|
|
if (err < 0)
|
|
l2cap_chan_put(pchan);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
|
|
{
|
|
struct lowpan_peer *peer;
|
|
|
|
BT_DBG("conn %p dst type %d", conn, dst_type);
|
|
|
|
peer = lookup_peer(conn);
|
|
if (!peer)
|
|
return -ENOENT;
|
|
|
|
BT_DBG("peer %p chan %p", peer, peer->chan);
|
|
|
|
l2cap_chan_close(peer->chan, ENOENT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct l2cap_chan *bt_6lowpan_listen(void)
|
|
{
|
|
bdaddr_t *addr = BDADDR_ANY;
|
|
struct l2cap_chan *pchan;
|
|
int err;
|
|
|
|
if (psm_6lowpan == 0)
|
|
return NULL;
|
|
|
|
pchan = chan_get();
|
|
if (!pchan)
|
|
return NULL;
|
|
|
|
pchan->state = BT_LISTEN;
|
|
pchan->src_type = BDADDR_LE_PUBLIC;
|
|
|
|
BT_DBG("psm 0x%04x chan %p src type %d", psm_6lowpan, pchan,
|
|
pchan->src_type);
|
|
|
|
err = l2cap_add_psm(pchan, addr, cpu_to_le16(psm_6lowpan));
|
|
if (err) {
|
|
l2cap_chan_put(pchan);
|
|
BT_ERR("psm cannot be added err %d", err);
|
|
return NULL;
|
|
}
|
|
|
|
return pchan;
|
|
}
|
|
|
|
static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
|
|
struct l2cap_conn **conn)
|
|
{
|
|
struct hci_conn *hcon;
|
|
struct hci_dev *hdev;
|
|
bdaddr_t *src = BDADDR_ANY;
|
|
int n;
|
|
|
|
n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
|
|
&addr->b[5], &addr->b[4], &addr->b[3],
|
|
&addr->b[2], &addr->b[1], &addr->b[0],
|
|
addr_type);
|
|
|
|
if (n < 7)
|
|
return -EINVAL;
|
|
|
|
hdev = hci_get_route(addr, src);
|
|
if (!hdev)
|
|
return -ENOENT;
|
|
|
|
hci_dev_lock(hdev);
|
|
hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr);
|
|
hci_dev_unlock(hdev);
|
|
|
|
if (!hcon)
|
|
return -ENOENT;
|
|
|
|
*conn = (struct l2cap_conn *)hcon->l2cap_data;
|
|
|
|
BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void disconnect_all_peers(void)
|
|
{
|
|
struct lowpan_dev *entry, *tmp_dev;
|
|
struct lowpan_peer *peer, *tmp_peer, *new_peer;
|
|
struct list_head peers;
|
|
unsigned long flags;
|
|
|
|
INIT_LIST_HEAD(&peers);
|
|
|
|
/* We make a separate list of peers as the close_cb() will
|
|
* modify the device peers list so it is better not to mess
|
|
* with the same list at the same time.
|
|
*/
|
|
|
|
read_lock_irqsave(&devices_lock, flags);
|
|
|
|
list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) {
|
|
list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list) {
|
|
new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
|
|
if (!new_peer)
|
|
break;
|
|
|
|
new_peer->chan = peer->chan;
|
|
INIT_LIST_HEAD(&new_peer->list);
|
|
|
|
list_add(&new_peer->list, &peers);
|
|
}
|
|
}
|
|
|
|
read_unlock_irqrestore(&devices_lock, flags);
|
|
|
|
list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
|
|
l2cap_chan_close(peer->chan, ENOENT);
|
|
kfree(peer);
|
|
}
|
|
}
|
|
|
|
static int lowpan_psm_set(void *data, u64 val)
|
|
{
|
|
u16 psm;
|
|
|
|
psm = val;
|
|
if (psm == 0 || psm_6lowpan != psm)
|
|
/* Disconnect existing connections if 6lowpan is
|
|
* disabled (psm = 0), or if psm changes.
|
|
*/
|
|
disconnect_all_peers();
|
|
|
|
psm_6lowpan = psm;
|
|
|
|
if (listen_chan) {
|
|
l2cap_chan_close(listen_chan, 0);
|
|
l2cap_chan_put(listen_chan);
|
|
}
|
|
|
|
listen_chan = bt_6lowpan_listen();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lowpan_psm_get(void *data, u64 *val)
|
|
{
|
|
*val = psm_6lowpan;
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_SIMPLE_ATTRIBUTE(lowpan_psm_fops, lowpan_psm_get,
|
|
lowpan_psm_set, "%llu\n");
|
|
|
|
static ssize_t lowpan_control_write(struct file *fp,
|
|
const char __user *user_buffer,
|
|
size_t count,
|
|
loff_t *position)
|
|
{
|
|
char buf[32];
|
|
size_t buf_size = min(count, sizeof(buf) - 1);
|
|
int ret;
|
|
bdaddr_t addr;
|
|
u8 addr_type;
|
|
struct l2cap_conn *conn = NULL;
|
|
|
|
if (copy_from_user(buf, user_buffer, buf_size))
|
|
return -EFAULT;
|
|
|
|
buf[buf_size] = '\0';
|
|
|
|
if (memcmp(buf, "connect ", 8) == 0) {
|
|
ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
|
|
if (ret == -EINVAL)
|
|
return ret;
|
|
|
|
if (listen_chan) {
|
|
l2cap_chan_close(listen_chan, 0);
|
|
l2cap_chan_put(listen_chan);
|
|
listen_chan = NULL;
|
|
}
|
|
|
|
if (conn) {
|
|
struct lowpan_peer *peer;
|
|
|
|
if (!is_bt_6lowpan(conn->hcon))
|
|
return -EINVAL;
|
|
|
|
peer = lookup_peer(conn);
|
|
if (peer) {
|
|
BT_DBG("6LoWPAN connection already exists");
|
|
return -EALREADY;
|
|
}
|
|
|
|
BT_DBG("conn %p dst %pMR type %d user %d", conn,
|
|
&conn->hcon->dst, conn->hcon->dst_type,
|
|
addr_type);
|
|
}
|
|
|
|
ret = bt_6lowpan_connect(&addr, addr_type);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
if (memcmp(buf, "disconnect ", 11) == 0) {
|
|
ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = bt_6lowpan_disconnect(conn, addr_type);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static int lowpan_control_show(struct seq_file *f, void *ptr)
|
|
{
|
|
struct lowpan_dev *entry, *tmp_dev;
|
|
struct lowpan_peer *peer, *tmp_peer;
|
|
unsigned long flags;
|
|
|
|
read_lock_irqsave(&devices_lock, flags);
|
|
|
|
list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) {
|
|
list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list)
|
|
seq_printf(f, "%pMR (type %u)\n",
|
|
&peer->chan->dst, peer->chan->dst_type);
|
|
}
|
|
|
|
read_unlock_irqrestore(&devices_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lowpan_control_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, lowpan_control_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations lowpan_control_fops = {
|
|
.open = lowpan_control_open,
|
|
.read = seq_read,
|
|
.write = lowpan_control_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static void disconnect_devices(void)
|
|
{
|
|
struct lowpan_dev *entry, *tmp, *new_dev;
|
|
struct list_head devices;
|
|
unsigned long flags;
|
|
|
|
INIT_LIST_HEAD(&devices);
|
|
|
|
/* We make a separate list of devices because the unregister_netdev()
|
|
* will call device_event() which will also want to modify the same
|
|
* devices list.
|
|
*/
|
|
|
|
read_lock_irqsave(&devices_lock, flags);
|
|
|
|
list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
|
|
new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
|
|
if (!new_dev)
|
|
break;
|
|
|
|
new_dev->netdev = entry->netdev;
|
|
INIT_LIST_HEAD(&new_dev->list);
|
|
|
|
list_add(&new_dev->list, &devices);
|
|
}
|
|
|
|
read_unlock_irqrestore(&devices_lock, flags);
|
|
|
|
list_for_each_entry_safe(entry, tmp, &devices, list) {
|
|
ifdown(entry->netdev);
|
|
BT_DBG("Unregistering netdev %s %p",
|
|
entry->netdev->name, entry->netdev);
|
|
unregister_netdev(entry->netdev);
|
|
kfree(entry);
|
|
}
|
|
}
|
|
|
|
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) {
|
|
BT_DBG("Unregistered netdev %s %p",
|
|
netdev->name, 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,
|
|
};
|
|
|
|
static int __init bt_6lowpan_init(void)
|
|
{
|
|
lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644,
|
|
bt_debugfs, NULL,
|
|
&lowpan_psm_fops);
|
|
lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
|
|
bt_debugfs, NULL,
|
|
&lowpan_control_fops);
|
|
|
|
return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
|
|
}
|
|
|
|
static void __exit bt_6lowpan_exit(void)
|
|
{
|
|
debugfs_remove(lowpan_psm_debugfs);
|
|
debugfs_remove(lowpan_control_debugfs);
|
|
|
|
if (listen_chan) {
|
|
l2cap_chan_close(listen_chan, 0);
|
|
l2cap_chan_put(listen_chan);
|
|
}
|
|
|
|
disconnect_devices();
|
|
|
|
unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
|
|
}
|
|
|
|
module_init(bt_6lowpan_init);
|
|
module_exit(bt_6lowpan_exit);
|
|
|
|
MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
|
|
MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
|
|
MODULE_VERSION(VERSION);
|
|
MODULE_LICENSE("GPL");
|