diff options
Diffstat (limited to '')
| -rw-r--r-- | net/bluetooth/6lowpan.c | 1283 |
1 files changed, 1283 insertions, 0 deletions
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c new file mode 100644 index 000000000..4eb1b3ced --- /dev/null +++ b/net/bluetooth/6lowpan.c @@ -0,0 +1,1283 @@ +// 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; +static DEFINE_MUTEX(set_lock); + +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_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 %u 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(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, ITER_SOURCE, &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 %u 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 %u 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 int bt_dev_init(struct net_device *dev) +{ + netdev_lockdep_set_classes(dev); + + return 0; +} + +static const struct net_device_ops netdev_ops = { + .ndo_init = bt_dev_init, + .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; + + 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; + bdaddr_t addr; + int err; + + 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(&addr, &chan->src); + __dev_addr_set(netdev, &addr, sizeof(addr)); + + 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 %u", 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); + } +} + +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 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 %u", 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 %u", 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); + hci_dev_put(hdev); + + if (!hcon) + return -ENOENT; + + *conn = (struct l2cap_conn *)hcon->l2cap_data; + + BT_DBG("conn %p dst %pMR type %u", *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; + + mutex_lock(&set_lock); + if (listen_chan) { + l2cap_chan_close(listen_chan, 0); + l2cap_chan_put(listen_chan); + } + + listen_chan = bt_6lowpan_listen(); + mutex_unlock(&set_lock); + + 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; + + mutex_lock(&set_lock); + if (listen_chan) { + l2cap_chan_close(listen_chan, 0); + l2cap_chan_put(listen_chan); + listen_chan = NULL; + } + mutex_unlock(&set_lock); + + 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 %u", 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"); |