/*
- Copyright (c) 2013 Intel Corp.
+ Copyright (c) 2013-2014 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
#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/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>
-#include "6lowpan.h"
-
#include <net/6lowpan.h> /* for the compression support */
+#define VERSION "0.1"
+
+static struct dentry *lowpan_psm_debugfs;
+static struct dentry *lowpan_control_debugfs;
+
#define IFACE_NAME_TEMPLATE "bt%d"
#define EUI64_ADDR_LEN 8
struct skb_cb {
struct in6_addr addr;
- struct l2cap_conn *conn;
+ struct l2cap_chan *chan;
+ int status;
};
#define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
static LIST_HEAD(bt_6lowpan_devices);
static DEFINE_RWLOCK(devices_lock);
+/* If psm is set to 0 (default value), then 6lowpan is disabled.
+ * Other values are used to indicate a Protocol Service Multiplexer
+ * value for 6lowpan.
+ */
+static u16 psm_6lowpan;
+
+/* We are listening incoming connections via this channel
+ */
+static struct l2cap_chan *listen_chan;
+
struct lowpan_peer {
struct list_head list;
- struct l2cap_conn *conn;
+ struct l2cap_chan *chan;
/* peer addresses in various formats */
unsigned char eui64_addr[EUI64_ADDR_LEN];
{
list_del(&peer->list);
+ module_put(THIS_MODULE);
+
if (atomic_dec_and_test(&dev->peer_count)) {
BT_DBG("last peer");
return true;
ba, type);
list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
- BT_DBG("addr %pMR type %d",
- &peer->conn->hcon->dst, peer->conn->hcon->dst_type);
+ BT_DBG("dst addr %pMR dst type %d",
+ &peer->chan->dst, peer->chan->dst_type);
- if (bacmp(&peer->conn->hcon->dst, ba))
+ if (bacmp(&peer->chan->dst, ba))
continue;
- if (type == peer->conn->hcon->dst_type)
+ if (type == peer->chan->dst_type)
+ return peer;
+ }
+
+ return NULL;
+}
+
+static inline struct lowpan_peer *peer_lookup_chan(struct lowpan_dev *dev,
+ struct l2cap_chan *chan)
+{
+ struct lowpan_peer *peer, *tmp;
+
+ list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
+ if (peer->chan == chan)
return peer;
}
struct lowpan_peer *peer, *tmp;
list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
- if (peer->conn == conn)
+ if (peer->chan->conn == conn)
return peer;
}
return -ENOMEM;
ret = netif_rx(skb_cp);
-
- BT_DBG("receive skb %d", ret);
- if (ret < 0)
+ if (ret < 0) {
+ BT_DBG("receive skb %d", ret);
return NET_RX_DROP;
+ }
return ret;
}
static int process_data(struct sk_buff *skb, struct net_device *netdev,
- struct l2cap_conn *conn)
+ struct l2cap_chan *chan)
{
const u8 *saddr, *daddr;
u8 iphc0, iphc1;
dev = lowpan_dev(netdev);
read_lock_irqsave(&devices_lock, flags);
- peer = peer_lookup_conn(dev, conn);
+ peer = peer_lookup_chan(dev, chan);
read_unlock_irqrestore(&devices_lock, flags);
if (!peer)
goto drop;
}
static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
- struct l2cap_conn *conn)
+ struct l2cap_chan *chan)
{
struct sk_buff *local_skb;
int ret;
if (!local_skb)
goto drop;
- ret = process_data(local_skb, dev, conn);
+ ret = process_data(local_skb, dev, chan);
if (ret != NET_RX_SUCCESS)
goto drop;
return NET_RX_SUCCESS;
drop:
+ dev->stats.rx_dropped++;
kfree_skb(skb);
return NET_RX_DROP;
}
/* Packet from BT LE device */
-int bt_6lowpan_recv(struct l2cap_conn *conn, struct sk_buff *skb)
+static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
{
struct lowpan_dev *dev;
struct lowpan_peer *peer;
int err;
- peer = lookup_peer(conn);
+ peer = lookup_peer(chan->conn);
if (!peer)
return -ENOENT;
- dev = lookup_dev(conn);
+ dev = lookup_dev(chan->conn);
if (!dev || !dev->netdev)
return -ENOENT;
- err = recv_pkt(skb, dev->netdev, conn);
- BT_DBG("recv pkt %d", err);
-
- return err;
-}
-
-static inline int skbuff_copy(void *msg, int len, int count, int mtu,
- struct sk_buff *skb, struct net_device *dev)
-{
- struct sk_buff **frag;
- int sent = 0;
-
- memcpy(skb_put(skb, count), msg, count);
-
- sent += count;
- msg += count;
- len -= count;
-
- dev->stats.tx_bytes += count;
- dev->stats.tx_packets++;
-
- raw_dump_table(__func__, "Sending", skb->data, skb->len);
-
- /* Continuation fragments (no L2CAP header) */
- frag = &skb_shinfo(skb)->frag_list;
- while (len > 0) {
- struct sk_buff *tmp;
-
- count = min_t(unsigned int, mtu, len);
-
- tmp = bt_skb_alloc(count, GFP_ATOMIC);
- if (!tmp)
- return -ENOMEM;
-
- *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++;
+ err = recv_pkt(skb, dev->netdev, chan);
+ if (err) {
+ BT_DBG("recv pkt %d", err);
+ err = -EAGAIN;
}
- 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 (!skb)
- return ERR_PTR(-ENOMEM);
-
- 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;
+ return err;
}
static u8 get_addr_type_from_eui64(u8 byte)
{
- /* Is universal(0) or local(1) bit, */
- if (byte & 0x02)
- return ADDR_LE_DEV_RANDOM;
-
- return ADDR_LE_DEV_PUBLIC;
+ /* Is universal(0) or local(1) bit */
+ return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
}
static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
if (ipv6_addr_is_multicast(&hdr->daddr)) {
memcpy(&lowpan_cb(skb)->addr, &hdr->daddr,
sizeof(struct in6_addr));
- lowpan_cb(skb)->conn = NULL;
+ lowpan_cb(skb)->chan = NULL;
} else {
unsigned long flags;
*/
convert_dest_bdaddr(&hdr->daddr, &addr, &addr_type);
- BT_DBG("dest addr %pMR type %s IP %pI6c", &addr,
- addr_type == ADDR_LE_DEV_PUBLIC ? "PUBLIC" : "RANDOM",
- &hdr->daddr);
+ BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
+ addr_type, &hdr->daddr);
read_lock_irqsave(&devices_lock, flags);
peer = peer_lookup_ba(dev, &addr, addr_type);
memcpy(&lowpan_cb(skb)->addr, &hdr->daddr,
sizeof(struct in6_addr));
- lowpan_cb(skb)->conn = peer->conn;
+ lowpan_cb(skb)->chan = peer->chan;
}
saddr = dev->netdev->dev_addr;
}
/* Packet to BT LE device */
-static int send_pkt(struct l2cap_conn *conn, const void *saddr,
- const void *daddr, struct sk_buff *skb,
+static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
struct net_device *netdev)
{
- raw_dump_table(__func__, "raw skb data dump before fragmentation",
- skb->data, skb->len);
+ 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;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_iov = (struct iovec *) &iv;
+ msg.msg_iovlen = 1;
+ iv.iov_base = skb->data;
+ iv.iov_len = 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)
+ err = lowpan_cb(skb)->status;
- return conn_send(conn, skb->data, skb->len, 0, netdev);
+ if (err < 0) {
+ if (err == -EAGAIN)
+ netdev->stats.tx_dropped++;
+ else
+ netdev->stats.tx_errors++;
+ }
+
+ return err;
}
static void send_mcast_pkt(struct sk_buff *skb, struct net_device *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);
+ send_pkt(pentry->chan, local_skb, netdev);
kfree_skb(local_skb);
}
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;
unsigned long flags;
convert_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 %s to %pMR type %s IP %pI6c peer %p",
- netdev->name, &addr,
- addr_type == ADDR_LE_DEV_PUBLIC ? "PUBLIC" : "RANDOM",
+ BT_DBG("xmit %s to %pMR type %d IP %pI6c peer %p",
+ netdev->name, &addr, addr_type,
&lowpan_cb(skb)->addr, peer);
- if (peer && peer->conn)
- err = send_pkt(peer->conn, netdev->dev_addr,
- eui64_addr, skb, netdev);
+ if (peer && peer->chan)
+ err = send_pkt(peer->chan, skb, netdev);
+ else
+ err = -ENOENT;
}
dev_kfree_skb(skb);
eui[7] = addr[0];
/* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
- if (addr_type == ADDR_LE_DEV_PUBLIC)
+ if (addr_type == BDADDR_LE_PUBLIC)
eui[0] &= ~0x02;
else
eui[0] |= 0x02;
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,
if (hcon->type != LE_LINK)
return false;
- return test_bit(HCI_CONN_6LOWPAN, &hcon->flags);
+ 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 int add_peer_conn(struct l2cap_conn *conn, struct lowpan_dev *dev)
+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 -ENOMEM;
+ return NULL;
- peer->conn = conn;
+ 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, conn->hcon->dst.b,
- conn->hcon->dst_type);
+ 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);
INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
- return 0;
+ return peer->chan;
}
-/* 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)
+static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
{
- 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);
+ netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE,
+ NET_NAME_UNKNOWN, netdev_setup);
if (!netdev)
return -ENOMEM;
- set_dev_addr(netdev, &conn->hcon->src, conn->hcon->src_type);
+ set_dev_addr(netdev, &chan->src, chan->src_type);
netdev->netdev_ops = &netdev_ops;
- SET_NETDEV_DEV(netdev, &conn->hcon->dev);
+ SET_NETDEV_DEV(netdev, &chan->conn->hcon->dev);
SET_NETDEV_DEVTYPE(netdev, &bt_type);
err = register_netdev(netdev);
goto out;
}
- BT_DBG("ifindex %d peer bdaddr %pMR my addr %pMR",
- netdev->ifindex, &conn->hcon->dst, &conn->hcon->src);
+ 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 = conn->hcon->hdev;
- INIT_LIST_HEAD(&dev->peers);
+ *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);
+ 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);
+ 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 *pchan)
+{
+ struct l2cap_chan *chan;
+
+ chan = chan_open(pchan);
+ chan->ops = pchan->ops;
+
+ BT_DBG("chan %p pchan %p", chan, pchan);
+
+ return chan;
+}
+
static void delete_netdev(struct work_struct *work)
{
struct lowpan_dev *entry = container_of(work, struct lowpan_dev,
/* The entry pointer is deleted in device_event() */
}
-int bt_6lowpan_del_conn(struct l2cap_conn *conn)
+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;
+ bool last = false, removed = true;
- if (!conn || !is_bt_6lowpan(conn->hcon))
- return 0;
+ 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_conn(dev, conn);
+ 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;
}
}
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);
+ 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)
{
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;
.notifier_call = device_event,
};
-int bt_6lowpan_init(void)
+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);
}
-void bt_6lowpan_cleanup(void)
+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");
projects / cascardo / linux.git / blobdiff