linux/net/bluetooth/6lowpan.c
Taehee Yoo ab92d68fc2 net: core: add generic lockdep keys
Some interface types could be nested.
(VLAN, BONDING, TEAM, MACSEC, MACVLAN, IPVLAN, VIRT_WIFI, VXLAN, etc..)
These interface types should set lockdep class because, without lockdep
class key, lockdep always warn about unexisting circular locking.

In the current code, these interfaces have their own lockdep class keys and
these manage itself. So that there are so many duplicate code around the
/driver/net and /net/.
This patch adds new generic lockdep keys and some helper functions for it.

This patch does below changes.
a) Add lockdep class keys in struct net_device
   - qdisc_running, xmit, addr_list, qdisc_busylock
   - these keys are used as dynamic lockdep key.
b) When net_device is being allocated, lockdep keys are registered.
   - alloc_netdev_mqs()
c) When net_device is being free'd llockdep keys are unregistered.
   - free_netdev()
d) Add generic lockdep key helper function
   - netdev_register_lockdep_key()
   - netdev_unregister_lockdep_key()
   - netdev_update_lockdep_key()
e) Remove unnecessary generic lockdep macro and functions
f) Remove unnecessary lockdep code of each interfaces.

After this patch, each interface modules don't need to maintain
their lockdep keys.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-10-24 14:53:48 -07:00

1308 lines
28 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
Copyright (c) 2013-2014 Intel Corp.
*/
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/module.h>
#include <linux/debugfs.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/pkt_sched.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>
#include <net/6lowpan.h> /* for the compression support */
#define VERSION "0.1"
static struct dentry *lowpan_enable_debugfs;
static struct dentry *lowpan_control_debugfs;
#define IFACE_NAME_TEMPLATE "bt%d"
struct skb_cb {
struct in6_addr addr;
struct in6_addr gw;
struct l2cap_chan *chan;
};
#define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
/* The devices list contains those devices that we are acting
* as a proxy. The BT 6LoWPAN device is a virtual device that
* connects to the Bluetooth LE device. The real connection to
* BT device is done via l2cap layer. There exists one
* virtual device / one BT 6LoWPAN network (=hciX device).
* The list contains struct lowpan_dev elements.
*/
static LIST_HEAD(bt_6lowpan_devices);
static DEFINE_SPINLOCK(devices_lock);
static bool enable_6lowpan;
/* We are listening incoming connections via this channel
*/
static struct l2cap_chan *listen_chan;
struct lowpan_peer {
struct list_head list;
struct rcu_head rcu;
struct l2cap_chan *chan;
/* peer addresses in various formats */
unsigned char lladdr[ETH_ALEN];
struct in6_addr peer_addr;
};
struct lowpan_btle_dev {
struct list_head list;
struct hci_dev *hdev;
struct net_device *netdev;
struct list_head peers;
atomic_t peer_count; /* number of items in peers list */
struct work_struct delete_netdev;
struct delayed_work notify_peers;
};
static inline struct lowpan_btle_dev *
lowpan_btle_dev(const struct net_device *netdev)
{
return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv;
}
static inline void peer_add(struct lowpan_btle_dev *dev,
struct lowpan_peer *peer)
{
list_add_rcu(&peer->list, &dev->peers);
atomic_inc(&dev->peer_count);
}
static inline bool peer_del(struct lowpan_btle_dev *dev,
struct lowpan_peer *peer)
{
list_del_rcu(&peer->list);
kfree_rcu(peer, rcu);
module_put(THIS_MODULE);
if (atomic_dec_and_test(&dev->peer_count)) {
BT_DBG("last peer");
return true;
}
return false;
}
static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_btle_dev *dev,
bdaddr_t *ba, __u8 type)
{
struct lowpan_peer *peer;
BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
ba, type);
rcu_read_lock();
list_for_each_entry_rcu(peer, &dev->peers, list) {
BT_DBG("dst addr %pMR dst type %d",
&peer->chan->dst, peer->chan->dst_type);
if (bacmp(&peer->chan->dst, ba))
continue;
if (type == peer->chan->dst_type) {
rcu_read_unlock();
return peer;
}
}
rcu_read_unlock();
return NULL;
}
static inline struct lowpan_peer *
__peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan)
{
struct lowpan_peer *peer;
list_for_each_entry_rcu(peer, &dev->peers, list) {
if (peer->chan == chan)
return peer;
}
return NULL;
}
static inline struct lowpan_peer *
__peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn)
{
struct lowpan_peer *peer;
list_for_each_entry_rcu(peer, &dev->peers, list) {
if (peer->chan->conn == conn)
return peer;
}
return NULL;
}
static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev,
struct in6_addr *daddr,
struct sk_buff *skb)
{
struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
int count = atomic_read(&dev->peer_count);
const struct in6_addr *nexthop;
struct lowpan_peer *peer;
struct neighbour *neigh;
BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
if (!rt) {
if (ipv6_addr_any(&lowpan_cb(skb)->gw)) {
/* There is neither route nor gateway,
* probably the destination is a direct peer.
*/
nexthop = daddr;
} else {
/* There is a known gateway
*/
nexthop = &lowpan_cb(skb)->gw;
}
} else {
nexthop = rt6_nexthop(rt, daddr);
/* We need to remember the address because it is needed
* by bt_xmit() when sending the packet. In bt_xmit(), the
* destination routing info is not set.
*/
memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
}
BT_DBG("gw %pI6c", nexthop);
rcu_read_lock();
list_for_each_entry_rcu(peer, &dev->peers, list) {
BT_DBG("dst addr %pMR dst type %d ip %pI6c",
&peer->chan->dst, peer->chan->dst_type,
&peer->peer_addr);
if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
rcu_read_unlock();
return peer;
}
}
/* use the neighbour cache for matching addresses assigned by SLAAC
*/
neigh = __ipv6_neigh_lookup(dev->netdev, nexthop);
if (neigh) {
list_for_each_entry_rcu(peer, &dev->peers, list) {
if (!memcmp(neigh->ha, peer->lladdr, ETH_ALEN)) {
neigh_release(neigh);
rcu_read_unlock();
return peer;
}
}
neigh_release(neigh);
}
rcu_read_unlock();
return NULL;
}
static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
{
struct lowpan_btle_dev *entry;
struct lowpan_peer *peer = NULL;
rcu_read_lock();
list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
peer = __peer_lookup_conn(entry, conn);
if (peer)
break;
}
rcu_read_unlock();
return peer;
}
static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn)
{
struct lowpan_btle_dev *entry;
struct lowpan_btle_dev *dev = NULL;
rcu_read_lock();
list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
if (conn->hcon->hdev == entry->hdev) {
dev = entry;
break;
}
}
rcu_read_unlock();
return dev;
}
static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
{
struct sk_buff *skb_cp;
skb_cp = skb_copy(skb, GFP_ATOMIC);
if (!skb_cp)
return NET_RX_DROP;
return netif_rx_ni(skb_cp);
}
static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
struct lowpan_peer *peer)
{
const u8 *saddr;
saddr = peer->lladdr;
return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr);
}
static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
struct lowpan_peer *peer)
{
struct sk_buff *local_skb;
int ret;
if (!netif_running(dev))
goto drop;
if (dev->type != ARPHRD_6LOWPAN || !skb->len)
goto drop;
skb_reset_network_header(skb);
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
goto drop;
/* check that it's our buffer */
if (lowpan_is_ipv6(*skb_network_header(skb))) {
/* Pull off the 1-byte of 6lowpan header. */
skb_pull(skb, 1);
/* Copy the packet so that the IPv6 header is
* properly aligned.
*/
local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
skb_tailroom(skb), GFP_ATOMIC);
if (!local_skb)
goto drop;
local_skb->protocol = htons(ETH_P_IPV6);
local_skb->pkt_type = PACKET_HOST;
local_skb->dev = dev;
skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
kfree_skb(local_skb);
goto drop;
}
dev->stats.rx_bytes += skb->len;
dev->stats.rx_packets++;
consume_skb(local_skb);
consume_skb(skb);
} else if (lowpan_is_iphc(*skb_network_header(skb))) {
local_skb = skb_clone(skb, GFP_ATOMIC);
if (!local_skb)
goto drop;
local_skb->dev = dev;
ret = iphc_decompress(local_skb, dev, peer);
if (ret < 0) {
BT_DBG("iphc_decompress failed: %d", ret);
kfree_skb(local_skb);
goto drop;
}
local_skb->protocol = htons(ETH_P_IPV6);
local_skb->pkt_type = PACKET_HOST;
if (give_skb_to_upper(local_skb, dev)
!= NET_RX_SUCCESS) {
kfree_skb(local_skb);
goto drop;
}
dev->stats.rx_bytes += skb->len;
dev->stats.rx_packets++;
consume_skb(local_skb);
consume_skb(skb);
} else {
BT_DBG("unknown packet type");
goto drop;
}
return NET_RX_SUCCESS;
drop:
dev->stats.rx_dropped++;
return NET_RX_DROP;
}
/* Packet from BT LE device */
static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
{
struct lowpan_btle_dev *dev;
struct lowpan_peer *peer;
int err;
peer = lookup_peer(chan->conn);
if (!peer)
return -ENOENT;
dev = lookup_dev(chan->conn);
if (!dev || !dev->netdev)
return -ENOENT;
err = recv_pkt(skb, dev->netdev, peer);
if (err) {
BT_DBG("recv pkt %d", err);
err = -EAGAIN;
}
return err;
}
static int setup_header(struct sk_buff *skb, struct net_device *netdev,
bdaddr_t *peer_addr, u8 *peer_addr_type)
{
struct in6_addr ipv6_daddr;
struct ipv6hdr *hdr;
struct lowpan_btle_dev *dev;
struct lowpan_peer *peer;
u8 *daddr;
int err, status = 0;
hdr = ipv6_hdr(skb);
dev = lowpan_btle_dev(netdev);
memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr));
if (ipv6_addr_is_multicast(&ipv6_daddr)) {
lowpan_cb(skb)->chan = NULL;
daddr = NULL;
} else {
BT_DBG("dest IP %pI6c", &ipv6_daddr);
/* The packet might be sent to 6lowpan interface
* because of routing (either via default route
* or user set route) so get peer according to
* the destination address.
*/
peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
if (!peer) {
BT_DBG("no such peer");
return -ENOENT;
}
daddr = peer->lladdr;
*peer_addr = peer->chan->dst;
*peer_addr_type = peer->chan->dst_type;
lowpan_cb(skb)->chan = peer->chan;
status = 1;
}
lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr);
err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
if (err < 0)
return err;
return status;
}
static int header_create(struct sk_buff *skb, struct net_device *netdev,
unsigned short type, const void *_daddr,
const void *_saddr, unsigned int len)
{
if (type != ETH_P_IPV6)
return -EINVAL;
return 0;
}
/* Packet to BT LE device */
static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
struct net_device *netdev)
{
struct msghdr msg;
struct kvec iv;
int err;
/* Remember the skb so that we can send EAGAIN to the caller if
* we run out of credits.
*/
chan->data = skb;
iv.iov_base = skb->data;
iv.iov_len = skb->len;
memset(&msg, 0, sizeof(msg));
iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, skb->len);
err = l2cap_chan_send(chan, &msg, skb->len);
if (err > 0) {
netdev->stats.tx_bytes += err;
netdev->stats.tx_packets++;
return 0;
}
if (err < 0)
netdev->stats.tx_errors++;
return err;
}
static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
{
struct sk_buff *local_skb;
struct lowpan_btle_dev *entry;
int err = 0;
rcu_read_lock();
list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
struct lowpan_peer *pentry;
struct lowpan_btle_dev *dev;
if (entry->netdev != netdev)
continue;
dev = lowpan_btle_dev(entry->netdev);
list_for_each_entry_rcu(pentry, &dev->peers, list) {
int ret;
local_skb = skb_clone(skb, GFP_ATOMIC);
BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
netdev->name,
&pentry->chan->dst, pentry->chan->dst_type,
&pentry->peer_addr, pentry->chan);
ret = send_pkt(pentry->chan, local_skb, netdev);
if (ret < 0)
err = ret;
kfree_skb(local_skb);
}
}
rcu_read_unlock();
return err;
}
static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
{
int err = 0;
bdaddr_t addr;
u8 addr_type;
/* We must take a copy of the skb before we modify/replace the ipv6
* header as the header could be used elsewhere
*/
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb)
return NET_XMIT_DROP;
/* Return values from setup_header()
* <0 - error, packet is dropped
* 0 - this is a multicast packet
* 1 - this is unicast packet
*/
err = setup_header(skb, netdev, &addr, &addr_type);
if (err < 0) {
kfree_skb(skb);
return NET_XMIT_DROP;
}
if (err) {
if (lowpan_cb(skb)->chan) {
BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
netdev->name, &addr, addr_type,
&lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
} else {
err = -ENOENT;
}
} else {
/* We need to send the packet to every device behind this
* interface.
*/
err = send_mcast_pkt(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 const struct header_ops header_ops = {
.create = header_create,
};
static void netdev_setup(struct net_device *dev)
{
dev->hard_header_len = 0;
dev->needed_tailroom = 0;
dev->flags = IFF_RUNNING | IFF_MULTICAST;
dev->watchdog_timeo = 0;
dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
dev->netdev_ops = &netdev_ops;
dev->header_ops = &header_ops;
dev->needs_free_netdev = true;
}
static struct device_type bt_type = {
.name = "bluetooth",
};
static void ifup(struct net_device *netdev)
{
int err;
rtnl_lock();
err = dev_open(netdev, NULL);
if (err < 0)
BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
rtnl_unlock();
}
static void ifdown(struct net_device *netdev)
{
rtnl_lock();
dev_close(netdev);
rtnl_unlock();
}
static void do_notify_peers(struct work_struct *work)
{
struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_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 (!enable_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->imtu = 1280;
return chan;
}
static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
struct lowpan_btle_dev *dev,
bool new_netdev)
{
struct lowpan_peer *peer;
peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
if (!peer)
return NULL;
peer->chan = chan;
memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
baswap((void *)peer->lladdr, &chan->dst);
lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr);
spin_lock(&devices_lock);
INIT_LIST_HEAD(&peer->list);
peer_add(dev, peer);
spin_unlock(&devices_lock);
/* Notifying peers about us needs to be done without locks held */
if (new_netdev)
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_btle_dev **dev)
{
struct net_device *netdev;
int err = 0;
netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
netdev_setup);
if (!netdev)
return -ENOMEM;
netdev->addr_assign_type = NET_ADDR_PERM;
baswap((void *)netdev->dev_addr, &chan->src);
netdev->netdev_ops = &netdev_ops;
SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
SET_NETDEV_DEVTYPE(netdev, &bt_type);
*dev = lowpan_btle_dev(netdev);
(*dev)->netdev = netdev;
(*dev)->hdev = chan->conn->hcon->hdev;
INIT_LIST_HEAD(&(*dev)->peers);
spin_lock(&devices_lock);
INIT_LIST_HEAD(&(*dev)->list);
list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
spin_unlock(&devices_lock);
err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE);
if (err < 0) {
BT_INFO("register_netdev failed %d", err);
spin_lock(&devices_lock);
list_del_rcu(&(*dev)->list);
spin_unlock(&devices_lock);
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);
return 0;
out:
return err;
}
static inline void chan_ready_cb(struct l2cap_chan *chan)
{
struct lowpan_btle_dev *dev;
bool new_netdev = false;
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;
}
new_netdev = true;
}
if (!try_module_get(THIS_MODULE))
return;
add_peer_chan(chan, dev, new_netdev);
ifup(dev->netdev);
}
static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
{
struct l2cap_chan *chan;
chan = chan_create();
if (!chan)
return NULL;
chan->ops = pchan->ops;
BT_DBG("chan %p pchan %p", chan, pchan);
return chan;
}
static void delete_netdev(struct work_struct *work)
{
struct lowpan_btle_dev *entry = container_of(work,
struct lowpan_btle_dev,
delete_netdev);
lowpan_unregister_netdev(entry->netdev);
/* The entry pointer is deleted by the netdev destructor. */
}
static void chan_close_cb(struct l2cap_chan *chan)
{
struct lowpan_btle_dev *entry;
struct lowpan_btle_dev *dev = NULL;
struct lowpan_peer *peer;
int err = -ENOENT;
bool last = false, remove = 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.
*/
remove = false;
}
spin_lock(&devices_lock);
list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
dev = lowpan_btle_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,
kref_read(&chan->kref));
l2cap_chan_put(chan);
break;
}
}
if (!err && last && dev && !atomic_read(&dev->peer_count)) {
spin_unlock(&devices_lock);
cancel_delayed_work_sync(&dev->notify_peers);
ifdown(dev->netdev);
if (remove) {
INIT_WORK(&entry->delete_netdev, delete_netdev);
schedule_work(&entry->delete_netdev);
}
} else {
spin_unlock(&devices_lock);
}
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 lowpan_btle_dev *dev;
BT_DBG("chan %p suspend", chan);
dev = lookup_dev(chan->conn);
if (!dev || !dev->netdev)
return;
netif_stop_queue(dev->netdev);
}
static void chan_resume_cb(struct l2cap_chan *chan)
{
struct lowpan_btle_dev *dev;
BT_DBG("chan %p resume", chan);
dev = lookup_dev(chan->conn);
if (!dev || !dev->netdev)
return;
netif_wake_queue(dev->netdev);
}
static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
{
return L2CAP_CONN_TIMEOUT;
}
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,
.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 int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
{
struct l2cap_chan *chan;
int err;
chan = chan_create();
if (!chan)
return -EINVAL;
chan->ops = &bt_6lowpan_chan_ops;
err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
addr, dst_type);
BT_DBG("chan %p err %d", chan, err);
if (err < 0)
l2cap_chan_put(chan);
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 *chan;
int err;
if (!enable_6lowpan)
return NULL;
chan = chan_create();
if (!chan)
return NULL;
chan->ops = &bt_6lowpan_chan_ops;
chan->state = BT_LISTEN;
chan->src_type = BDADDR_LE_PUBLIC;
atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
BT_DBG("chan %p src type %d", chan, chan->src_type);
err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
if (err) {
l2cap_chan_put(chan);
BT_ERR("psm cannot be added err %d", err);
return NULL;
}
return chan;
}
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;
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;
/* The LE_PUBLIC address type is ignored because of BDADDR_ANY */
hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC);
if (!hdev)
return -ENOENT;
hci_dev_lock(hdev);
hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type);
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_btle_dev *entry;
struct lowpan_peer *peer, *tmp_peer, *new_peer;
struct list_head peers;
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.
*/
rcu_read_lock();
list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
list_for_each_entry_rcu(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);
}
}
rcu_read_unlock();
spin_lock(&devices_lock);
list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
l2cap_chan_close(peer->chan, ENOENT);
list_del_rcu(&peer->list);
kfree_rcu(peer, rcu);
}
spin_unlock(&devices_lock);
}
struct set_enable {
struct work_struct work;
bool flag;
};
static void do_enable_set(struct work_struct *work)
{
struct set_enable *set_enable = container_of(work,
struct set_enable, work);
if (!set_enable->flag || enable_6lowpan != set_enable->flag)
/* Disconnect existing connections if 6lowpan is
* disabled
*/
disconnect_all_peers();
enable_6lowpan = set_enable->flag;
if (listen_chan) {
l2cap_chan_close(listen_chan, 0);
l2cap_chan_put(listen_chan);
}
listen_chan = bt_6lowpan_listen();
kfree(set_enable);
}
static int lowpan_enable_set(void *data, u64 val)
{
struct set_enable *set_enable;
set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
if (!set_enable)
return -ENOMEM;
set_enable->flag = !!val;
INIT_WORK(&set_enable->work, do_enable_set);
schedule_work(&set_enable->work);
return 0;
}
static int lowpan_enable_get(void *data, u64 *val)
{
*val = enable_6lowpan;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
lowpan_enable_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_btle_dev *entry;
struct lowpan_peer *peer;
spin_lock(&devices_lock);
list_for_each_entry(entry, &bt_6lowpan_devices, list) {
list_for_each_entry(peer, &entry->peers, list)
seq_printf(f, "%pMR (type %u)\n",
&peer->chan->dst, peer->chan->dst_type);
}
spin_unlock(&devices_lock);
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_btle_dev *entry, *tmp, *new_dev;
struct list_head devices;
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.
*/
rcu_read_lock();
list_for_each_entry_rcu(entry, &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_rcu(&new_dev->list, &devices);
}
rcu_read_unlock();
list_for_each_entry_safe(entry, tmp, &devices, list) {
ifdown(entry->netdev);
BT_DBG("Unregistering netdev %s %p",
entry->netdev->name, entry->netdev);
lowpan_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_btle_dev *entry;
if (netdev->type != ARPHRD_6LOWPAN)
return NOTIFY_DONE;
switch (event) {
case NETDEV_UNREGISTER:
spin_lock(&devices_lock);
list_for_each_entry(entry, &bt_6lowpan_devices, list) {
if (entry->netdev == netdev) {
BT_DBG("Unregistered netdev %s %p",
netdev->name, netdev);
list_del(&entry->list);
break;
}
}
spin_unlock(&devices_lock);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block bt_6lowpan_dev_notifier = {
.notifier_call = device_event,
};
static int __init bt_6lowpan_init(void)
{
lowpan_enable_debugfs = debugfs_create_file_unsafe("6lowpan_enable",
0644, bt_debugfs,
NULL,
&lowpan_enable_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_enable_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");