2 Copyright (c) 2013-2014 Intel Corp.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License version 2 and
6 only version 2 as published by the Free Software Foundation.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
14 #include <linux/if_arp.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/module.h>
18 #include <linux/debugfs.h>
21 #include <net/ip6_route.h>
22 #include <net/addrconf.h>
24 #include <net/af_ieee802154.h> /* to get the address type */
26 #include <net/bluetooth/bluetooth.h>
27 #include <net/bluetooth/hci_core.h>
28 #include <net/bluetooth/l2cap.h>
30 #include <net/6lowpan.h> /* for the compression support */
34 static struct dentry *lowpan_enable_debugfs;
35 static struct dentry *lowpan_control_debugfs;
37 #define IFACE_NAME_TEMPLATE "bt%d"
38 #define EUI64_ADDR_LEN 8
43 struct l2cap_chan *chan;
46 #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
48 /* The devices list contains those devices that we are acting
49 * as a proxy. The BT 6LoWPAN device is a virtual device that
50 * connects to the Bluetooth LE device. The real connection to
51 * BT device is done via l2cap layer. There exists one
52 * virtual device / one BT 6LoWPAN network (=hciX device).
53 * The list contains struct lowpan_dev elements.
55 static LIST_HEAD(bt_6lowpan_devices);
56 static DEFINE_SPINLOCK(devices_lock);
58 static bool enable_6lowpan;
60 /* We are listening incoming connections via this channel
62 static struct l2cap_chan *listen_chan;
65 struct list_head list;
67 struct l2cap_chan *chan;
69 /* peer addresses in various formats */
70 unsigned char eui64_addr[EUI64_ADDR_LEN];
71 struct in6_addr peer_addr;
75 struct list_head list;
78 struct net_device *netdev;
79 struct list_head peers;
80 atomic_t peer_count; /* number of items in peers list */
82 struct work_struct delete_netdev;
83 struct delayed_work notify_peers;
86 static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev)
88 return netdev_priv(netdev);
91 static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer)
93 list_add_rcu(&peer->list, &dev->peers);
94 atomic_inc(&dev->peer_count);
97 static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer)
99 list_del_rcu(&peer->list);
100 kfree_rcu(peer, rcu);
102 module_put(THIS_MODULE);
104 if (atomic_dec_and_test(&dev->peer_count)) {
112 static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev,
113 bdaddr_t *ba, __u8 type)
115 struct lowpan_peer *peer;
117 BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
122 list_for_each_entry_rcu(peer, &dev->peers, list) {
123 BT_DBG("dst addr %pMR dst type %d",
124 &peer->chan->dst, peer->chan->dst_type);
126 if (bacmp(&peer->chan->dst, ba))
129 if (type == peer->chan->dst_type) {
140 static inline struct lowpan_peer *__peer_lookup_chan(struct lowpan_dev *dev,
141 struct l2cap_chan *chan)
143 struct lowpan_peer *peer;
145 list_for_each_entry_rcu(peer, &dev->peers, list) {
146 if (peer->chan == chan)
153 static inline struct lowpan_peer *__peer_lookup_conn(struct lowpan_dev *dev,
154 struct l2cap_conn *conn)
156 struct lowpan_peer *peer;
158 list_for_each_entry_rcu(peer, &dev->peers, list) {
159 if (peer->chan->conn == conn)
166 static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev,
167 struct in6_addr *daddr,
170 struct lowpan_peer *peer;
171 struct in6_addr *nexthop;
172 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
173 int count = atomic_read(&dev->peer_count);
175 BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
177 /* If we have multiple 6lowpan peers, then check where we should
178 * send the packet. If only one peer exists, then we can send the
183 peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer,
190 nexthop = &lowpan_cb(skb)->gw;
192 if (ipv6_addr_any(nexthop))
195 nexthop = rt6_nexthop(rt, daddr);
197 /* We need to remember the address because it is needed
198 * by bt_xmit() when sending the packet. In bt_xmit(), the
199 * destination routing info is not set.
201 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
204 BT_DBG("gw %pI6c", nexthop);
208 list_for_each_entry_rcu(peer, &dev->peers, list) {
209 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
210 &peer->chan->dst, peer->chan->dst_type,
213 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
224 static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
226 struct lowpan_dev *entry;
227 struct lowpan_peer *peer = NULL;
231 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
232 peer = __peer_lookup_conn(entry, conn);
242 static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn)
244 struct lowpan_dev *entry;
245 struct lowpan_dev *dev = NULL;
249 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
250 if (conn->hcon->hdev == entry->hdev) {
261 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
263 struct sk_buff *skb_cp;
265 skb_cp = skb_copy(skb, GFP_ATOMIC);
269 return netif_rx(skb_cp);
272 static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
273 struct l2cap_chan *chan)
275 const u8 *saddr, *daddr;
277 struct lowpan_dev *dev;
278 struct lowpan_peer *peer;
280 dev = lowpan_dev(netdev);
283 peer = __peer_lookup_chan(dev, chan);
288 saddr = peer->eui64_addr;
289 daddr = dev->netdev->dev_addr;
291 /* at least two bytes will be used for the encoding */
295 if (lowpan_fetch_skb_u8(skb, &iphc0))
298 if (lowpan_fetch_skb_u8(skb, &iphc1))
301 return lowpan_header_decompress(skb, netdev,
302 saddr, IEEE802154_ADDR_LONG,
303 EUI64_ADDR_LEN, daddr,
304 IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
309 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
310 struct l2cap_chan *chan)
312 struct sk_buff *local_skb;
315 if (!netif_running(dev))
318 if (dev->type != ARPHRD_6LOWPAN)
321 skb = skb_share_check(skb, GFP_ATOMIC);
325 /* check that it's our buffer */
326 if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
327 /* Copy the packet so that the IPv6 header is
330 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
331 skb_tailroom(skb), GFP_ATOMIC);
335 local_skb->protocol = htons(ETH_P_IPV6);
336 local_skb->pkt_type = PACKET_HOST;
338 skb_reset_network_header(local_skb);
339 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
341 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
342 kfree_skb(local_skb);
346 dev->stats.rx_bytes += skb->len;
347 dev->stats.rx_packets++;
349 consume_skb(local_skb);
352 switch (skb->data[0] & 0xe0) {
353 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
354 local_skb = skb_clone(skb, GFP_ATOMIC);
358 ret = iphc_decompress(local_skb, dev, chan);
360 kfree_skb(local_skb);
364 local_skb->protocol = htons(ETH_P_IPV6);
365 local_skb->pkt_type = PACKET_HOST;
366 local_skb->dev = dev;
368 if (give_skb_to_upper(local_skb, dev)
370 kfree_skb(local_skb);
374 dev->stats.rx_bytes += skb->len;
375 dev->stats.rx_packets++;
377 consume_skb(local_skb);
385 return NET_RX_SUCCESS;
388 dev->stats.rx_dropped++;
392 /* Packet from BT LE device */
393 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
395 struct lowpan_dev *dev;
396 struct lowpan_peer *peer;
399 peer = lookup_peer(chan->conn);
403 dev = lookup_dev(chan->conn);
404 if (!dev || !dev->netdev)
407 err = recv_pkt(skb, dev->netdev, chan);
409 BT_DBG("recv pkt %d", err);
416 static u8 get_addr_type_from_eui64(u8 byte)
418 /* Is universal(0) or local(1) bit */
419 return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
422 static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
424 u8 *eui64 = ip6_daddr->s6_addr + 8;
426 addr->b[0] = eui64[7];
427 addr->b[1] = eui64[6];
428 addr->b[2] = eui64[5];
429 addr->b[3] = eui64[2];
430 addr->b[4] = eui64[1];
431 addr->b[5] = eui64[0];
434 static void convert_dest_bdaddr(struct in6_addr *ip6_daddr,
435 bdaddr_t *addr, u8 *addr_type)
437 copy_to_bdaddr(ip6_daddr, addr);
439 /* We need to toggle the U/L bit that we got from IPv6 address
440 * so that we get the proper address and type of the BD address.
444 *addr_type = get_addr_type_from_eui64(addr->b[5]);
447 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
448 bdaddr_t *peer_addr, u8 *peer_addr_type)
450 struct in6_addr ipv6_daddr;
451 struct lowpan_dev *dev;
452 struct lowpan_peer *peer;
453 bdaddr_t addr, *any = BDADDR_ANY;
457 dev = lowpan_dev(netdev);
459 memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr));
461 if (ipv6_addr_is_multicast(&ipv6_daddr)) {
462 lowpan_cb(skb)->chan = NULL;
466 /* Get destination BT device from skb.
467 * If there is no such peer then discard the packet.
469 convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type);
471 BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
472 addr_type, &ipv6_daddr);
474 peer = peer_lookup_ba(dev, &addr, addr_type);
476 /* The packet might be sent to 6lowpan interface
477 * because of routing (either via default route
478 * or user set route) so get peer according to
479 * the destination address.
481 peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
483 BT_DBG("no such peer %pMR found", &addr);
488 daddr = peer->eui64_addr;
490 *peer_addr_type = addr_type;
491 lowpan_cb(skb)->chan = peer->chan;
496 lowpan_header_compress(skb, netdev, ETH_P_IPV6, daddr,
497 dev->netdev->dev_addr, skb->len);
499 err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
506 static int header_create(struct sk_buff *skb, struct net_device *netdev,
507 unsigned short type, const void *_daddr,
508 const void *_saddr, unsigned int len)
512 if (type != ETH_P_IPV6)
517 memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr));
522 /* Packet to BT LE device */
523 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
524 struct net_device *netdev)
530 /* Remember the skb so that we can send EAGAIN to the caller if
531 * we run out of credits.
535 iv.iov_base = skb->data;
536 iv.iov_len = skb->len;
538 memset(&msg, 0, sizeof(msg));
539 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len);
541 err = l2cap_chan_send(chan, &msg, skb->len);
543 netdev->stats.tx_bytes += err;
544 netdev->stats.tx_packets++;
549 err = lowpan_cb(skb)->status;
553 netdev->stats.tx_dropped++;
555 netdev->stats.tx_errors++;
561 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
563 struct sk_buff *local_skb;
564 struct lowpan_dev *entry;
569 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
570 struct lowpan_peer *pentry;
571 struct lowpan_dev *dev;
573 if (entry->netdev != netdev)
576 dev = lowpan_dev(entry->netdev);
578 list_for_each_entry_rcu(pentry, &dev->peers, list) {
581 local_skb = skb_clone(skb, GFP_ATOMIC);
583 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
585 &pentry->chan->dst, pentry->chan->dst_type,
586 &pentry->peer_addr, pentry->chan);
587 ret = send_pkt(pentry->chan, local_skb, netdev);
591 kfree_skb(local_skb);
600 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
606 /* We must take a copy of the skb before we modify/replace the ipv6
607 * header as the header could be used elsewhere
609 skb = skb_unshare(skb, GFP_ATOMIC);
611 return NET_XMIT_DROP;
613 /* Return values from setup_header()
614 * <0 - error, packet is dropped
615 * 0 - this is a multicast packet
616 * 1 - this is unicast packet
618 err = setup_header(skb, netdev, &addr, &addr_type);
621 return NET_XMIT_DROP;
625 if (lowpan_cb(skb)->chan) {
626 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
627 netdev->name, &addr, addr_type,
628 &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
629 err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
634 /* We need to send the packet to every device behind this
637 err = send_mcast_pkt(skb, netdev);
643 BT_DBG("ERROR: xmit failed (%d)", err);
645 return err < 0 ? NET_XMIT_DROP : err;
648 static struct lock_class_key bt_tx_busylock;
649 static struct lock_class_key bt_netdev_xmit_lock_key;
651 static void bt_set_lockdep_class_one(struct net_device *dev,
652 struct netdev_queue *txq,
655 lockdep_set_class(&txq->_xmit_lock, &bt_netdev_xmit_lock_key);
658 static int bt_dev_init(struct net_device *dev)
660 netdev_for_each_tx_queue(dev, bt_set_lockdep_class_one, NULL);
661 dev->qdisc_tx_busylock = &bt_tx_busylock;
666 static const struct net_device_ops netdev_ops = {
667 .ndo_init = bt_dev_init,
668 .ndo_start_xmit = bt_xmit,
671 static struct header_ops header_ops = {
672 .create = header_create,
675 static void netdev_setup(struct net_device *dev)
677 dev->addr_len = EUI64_ADDR_LEN;
678 dev->type = ARPHRD_6LOWPAN;
680 dev->hard_header_len = 0;
681 dev->needed_tailroom = 0;
682 dev->mtu = IPV6_MIN_MTU;
683 dev->tx_queue_len = 0;
684 dev->flags = IFF_RUNNING | IFF_POINTOPOINT |
686 dev->watchdog_timeo = 0;
688 dev->netdev_ops = &netdev_ops;
689 dev->header_ops = &header_ops;
690 dev->destructor = free_netdev;
693 static struct device_type bt_type = {
697 static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
699 /* addr is the BT address in little-endian format */
709 /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
710 if (addr_type == BDADDR_LE_PUBLIC)
715 BT_DBG("type %d addr %*phC", addr_type, 8, eui);
718 static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr,
721 netdev->addr_assign_type = NET_ADDR_PERM;
722 set_addr(netdev->dev_addr, addr->b, addr_type);
725 static void ifup(struct net_device *netdev)
730 err = dev_open(netdev);
732 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
736 static void ifdown(struct net_device *netdev)
741 err = dev_close(netdev);
743 BT_INFO("iface %s cannot be closed (%d)", netdev->name, err);
747 static void do_notify_peers(struct work_struct *work)
749 struct lowpan_dev *dev = container_of(work, struct lowpan_dev,
752 netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
755 static bool is_bt_6lowpan(struct hci_conn *hcon)
757 if (hcon->type != LE_LINK)
766 static struct l2cap_chan *chan_create(void)
768 struct l2cap_chan *chan;
770 chan = l2cap_chan_create();
774 l2cap_chan_set_defaults(chan);
776 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
777 chan->mode = L2CAP_MODE_LE_FLOWCTL;
779 chan->imtu = chan->omtu;
784 static struct l2cap_chan *chan_open(struct l2cap_chan *pchan)
786 struct l2cap_chan *chan;
788 chan = chan_create();
792 chan->remote_mps = chan->omtu;
793 chan->mps = chan->omtu;
795 chan->state = BT_CONNECTED;
800 static void set_ip_addr_bits(u8 addr_type, u8 *addr)
802 if (addr_type == BDADDR_LE_PUBLIC)
808 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
809 struct lowpan_dev *dev)
811 struct lowpan_peer *peer;
813 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
818 memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
821 peer->peer_addr.s6_addr[0] = 0xFE;
822 peer->peer_addr.s6_addr[1] = 0x80;
823 set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b,
826 memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
829 /* IPv6 address needs to have the U/L bit set properly so toggle
832 set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8);
834 spin_lock(&devices_lock);
835 INIT_LIST_HEAD(&peer->list);
837 spin_unlock(&devices_lock);
839 /* Notifying peers about us needs to be done without locks held */
840 INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
841 schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
846 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
848 struct net_device *netdev;
851 netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE,
852 NET_NAME_UNKNOWN, netdev_setup);
856 set_dev_addr(netdev, &chan->src, chan->src_type);
858 netdev->netdev_ops = &netdev_ops;
859 SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
860 SET_NETDEV_DEVTYPE(netdev, &bt_type);
862 err = register_netdev(netdev);
864 BT_INFO("register_netdev failed %d", err);
869 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
870 netdev->ifindex, &chan->dst, chan->dst_type,
871 &chan->src, chan->src_type);
872 set_bit(__LINK_STATE_PRESENT, &netdev->state);
874 *dev = netdev_priv(netdev);
875 (*dev)->netdev = netdev;
876 (*dev)->hdev = chan->conn->hcon->hdev;
877 INIT_LIST_HEAD(&(*dev)->peers);
879 spin_lock(&devices_lock);
880 INIT_LIST_HEAD(&(*dev)->list);
881 list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
882 spin_unlock(&devices_lock);
890 static inline void chan_ready_cb(struct l2cap_chan *chan)
892 struct lowpan_dev *dev;
894 dev = lookup_dev(chan->conn);
896 BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
899 if (setup_netdev(chan, &dev) < 0) {
900 l2cap_chan_del(chan, -ENOENT);
905 if (!try_module_get(THIS_MODULE))
908 add_peer_chan(chan, dev);
912 static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
914 struct l2cap_chan *chan;
916 chan = chan_open(pchan);
917 chan->ops = pchan->ops;
919 BT_DBG("chan %p pchan %p", chan, pchan);
924 static void delete_netdev(struct work_struct *work)
926 struct lowpan_dev *entry = container_of(work, struct lowpan_dev,
929 unregister_netdev(entry->netdev);
931 /* The entry pointer is deleted by the netdev destructor. */
934 static void chan_close_cb(struct l2cap_chan *chan)
936 struct lowpan_dev *entry;
937 struct lowpan_dev *dev = NULL;
938 struct lowpan_peer *peer;
940 bool last = false, remove = true;
942 BT_DBG("chan %p conn %p", chan, chan->conn);
944 if (chan->conn && chan->conn->hcon) {
945 if (!is_bt_6lowpan(chan->conn->hcon))
948 /* If conn is set, then the netdev is also there and we should
954 spin_lock(&devices_lock);
956 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
957 dev = lowpan_dev(entry->netdev);
958 peer = __peer_lookup_chan(dev, chan);
960 last = peer_del(dev, peer);
963 BT_DBG("dev %p removing %speer %p", dev,
964 last ? "last " : "1 ", peer);
965 BT_DBG("chan %p orig refcnt %d", chan,
966 atomic_read(&chan->kref.refcount));
968 l2cap_chan_put(chan);
973 if (!err && last && dev && !atomic_read(&dev->peer_count)) {
974 spin_unlock(&devices_lock);
976 cancel_delayed_work_sync(&dev->notify_peers);
981 INIT_WORK(&entry->delete_netdev, delete_netdev);
982 schedule_work(&entry->delete_netdev);
985 spin_unlock(&devices_lock);
991 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
993 BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
994 state_to_string(state), err);
997 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
998 unsigned long hdr_len,
999 unsigned long len, int nb)
1001 /* Note that we must allocate using GFP_ATOMIC here as
1002 * this function is called originally from netdev hard xmit
1003 * function in atomic context.
1005 return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
1008 static void chan_suspend_cb(struct l2cap_chan *chan)
1010 struct sk_buff *skb = chan->data;
1012 BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
1017 lowpan_cb(skb)->status = -EAGAIN;
1020 static void chan_resume_cb(struct l2cap_chan *chan)
1022 struct sk_buff *skb = chan->data;
1024 BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
1029 lowpan_cb(skb)->status = 0;
1032 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
1034 return L2CAP_CONN_TIMEOUT;
1037 static const struct l2cap_ops bt_6lowpan_chan_ops = {
1038 .name = "L2CAP 6LoWPAN channel",
1039 .new_connection = chan_new_conn_cb,
1040 .recv = chan_recv_cb,
1041 .close = chan_close_cb,
1042 .state_change = chan_state_change_cb,
1043 .ready = chan_ready_cb,
1044 .resume = chan_resume_cb,
1045 .suspend = chan_suspend_cb,
1046 .get_sndtimeo = chan_get_sndtimeo_cb,
1047 .alloc_skb = chan_alloc_skb_cb,
1049 .teardown = l2cap_chan_no_teardown,
1050 .defer = l2cap_chan_no_defer,
1051 .set_shutdown = l2cap_chan_no_set_shutdown,
1054 static inline __u8 bdaddr_type(__u8 type)
1056 if (type == ADDR_LE_DEV_PUBLIC)
1057 return BDADDR_LE_PUBLIC;
1059 return BDADDR_LE_RANDOM;
1062 static struct l2cap_chan *chan_get(void)
1064 struct l2cap_chan *pchan;
1066 pchan = chan_create();
1070 pchan->ops = &bt_6lowpan_chan_ops;
1075 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
1077 struct l2cap_chan *pchan;
1084 err = l2cap_chan_connect(pchan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
1087 BT_DBG("chan %p err %d", pchan, err);
1089 l2cap_chan_put(pchan);
1094 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
1096 struct lowpan_peer *peer;
1098 BT_DBG("conn %p dst type %d", conn, dst_type);
1100 peer = lookup_peer(conn);
1104 BT_DBG("peer %p chan %p", peer, peer->chan);
1106 l2cap_chan_close(peer->chan, ENOENT);
1111 static struct l2cap_chan *bt_6lowpan_listen(void)
1113 bdaddr_t *addr = BDADDR_ANY;
1114 struct l2cap_chan *pchan;
1117 if (!enable_6lowpan)
1124 pchan->state = BT_LISTEN;
1125 pchan->src_type = BDADDR_LE_PUBLIC;
1127 atomic_set(&pchan->nesting, L2CAP_NESTING_PARENT);
1129 BT_DBG("chan %p src type %d", pchan, pchan->src_type);
1131 err = l2cap_add_psm(pchan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
1133 l2cap_chan_put(pchan);
1134 BT_ERR("psm cannot be added err %d", err);
1141 static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
1142 struct l2cap_conn **conn)
1144 struct hci_conn *hcon;
1145 struct hci_dev *hdev;
1146 bdaddr_t *src = BDADDR_ANY;
1149 n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
1150 &addr->b[5], &addr->b[4], &addr->b[3],
1151 &addr->b[2], &addr->b[1], &addr->b[0],
1157 hdev = hci_get_route(addr, src);
1162 hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr);
1163 hci_dev_unlock(hdev);
1168 *conn = (struct l2cap_conn *)hcon->l2cap_data;
1170 BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1175 static void disconnect_all_peers(void)
1177 struct lowpan_dev *entry;
1178 struct lowpan_peer *peer, *tmp_peer, *new_peer;
1179 struct list_head peers;
1181 INIT_LIST_HEAD(&peers);
1183 /* We make a separate list of peers as the close_cb() will
1184 * modify the device peers list so it is better not to mess
1185 * with the same list at the same time.
1190 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1191 list_for_each_entry_rcu(peer, &entry->peers, list) {
1192 new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1196 new_peer->chan = peer->chan;
1197 INIT_LIST_HEAD(&new_peer->list);
1199 list_add(&new_peer->list, &peers);
1205 spin_lock(&devices_lock);
1206 list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1207 l2cap_chan_close(peer->chan, ENOENT);
1209 list_del_rcu(&peer->list);
1210 kfree_rcu(peer, rcu);
1212 spin_unlock(&devices_lock);
1216 struct work_struct work;
1220 static void do_enable_set(struct work_struct *work)
1222 struct set_enable *set_enable = container_of(work,
1223 struct set_enable, work);
1225 if (!set_enable->flag || enable_6lowpan != set_enable->flag)
1226 /* Disconnect existing connections if 6lowpan is
1229 disconnect_all_peers();
1231 enable_6lowpan = set_enable->flag;
1234 l2cap_chan_close(listen_chan, 0);
1235 l2cap_chan_put(listen_chan);
1238 listen_chan = bt_6lowpan_listen();
1243 static int lowpan_enable_set(void *data, u64 val)
1245 struct set_enable *set_enable;
1247 set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
1251 set_enable->flag = !!val;
1252 INIT_WORK(&set_enable->work, do_enable_set);
1254 schedule_work(&set_enable->work);
1259 static int lowpan_enable_get(void *data, u64 *val)
1261 *val = enable_6lowpan;
1265 DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
1266 lowpan_enable_set, "%llu\n");
1268 static ssize_t lowpan_control_write(struct file *fp,
1269 const char __user *user_buffer,
1274 size_t buf_size = min(count, sizeof(buf) - 1);
1278 struct l2cap_conn *conn = NULL;
1280 if (copy_from_user(buf, user_buffer, buf_size))
1283 buf[buf_size] = '\0';
1285 if (memcmp(buf, "connect ", 8) == 0) {
1286 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1291 l2cap_chan_close(listen_chan, 0);
1292 l2cap_chan_put(listen_chan);
1297 struct lowpan_peer *peer;
1299 if (!is_bt_6lowpan(conn->hcon))
1302 peer = lookup_peer(conn);
1304 BT_DBG("6LoWPAN connection already exists");
1308 BT_DBG("conn %p dst %pMR type %d user %d", conn,
1309 &conn->hcon->dst, conn->hcon->dst_type,
1313 ret = bt_6lowpan_connect(&addr, addr_type);
1320 if (memcmp(buf, "disconnect ", 11) == 0) {
1321 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1325 ret = bt_6lowpan_disconnect(conn, addr_type);
1335 static int lowpan_control_show(struct seq_file *f, void *ptr)
1337 struct lowpan_dev *entry;
1338 struct lowpan_peer *peer;
1340 spin_lock(&devices_lock);
1342 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1343 list_for_each_entry(peer, &entry->peers, list)
1344 seq_printf(f, "%pMR (type %u)\n",
1345 &peer->chan->dst, peer->chan->dst_type);
1348 spin_unlock(&devices_lock);
1353 static int lowpan_control_open(struct inode *inode, struct file *file)
1355 return single_open(file, lowpan_control_show, inode->i_private);
1358 static const struct file_operations lowpan_control_fops = {
1359 .open = lowpan_control_open,
1361 .write = lowpan_control_write,
1362 .llseek = seq_lseek,
1363 .release = single_release,
1366 static void disconnect_devices(void)
1368 struct lowpan_dev *entry, *tmp, *new_dev;
1369 struct list_head devices;
1371 INIT_LIST_HEAD(&devices);
1373 /* We make a separate list of devices because the unregister_netdev()
1374 * will call device_event() which will also want to modify the same
1380 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1381 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1385 new_dev->netdev = entry->netdev;
1386 INIT_LIST_HEAD(&new_dev->list);
1388 list_add_rcu(&new_dev->list, &devices);
1393 list_for_each_entry_safe(entry, tmp, &devices, list) {
1394 ifdown(entry->netdev);
1395 BT_DBG("Unregistering netdev %s %p",
1396 entry->netdev->name, entry->netdev);
1397 unregister_netdev(entry->netdev);
1402 static int device_event(struct notifier_block *unused,
1403 unsigned long event, void *ptr)
1405 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1406 struct lowpan_dev *entry;
1408 if (netdev->type != ARPHRD_6LOWPAN)
1412 case NETDEV_UNREGISTER:
1413 spin_lock(&devices_lock);
1414 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1415 if (entry->netdev == netdev) {
1416 BT_DBG("Unregistered netdev %s %p",
1417 netdev->name, netdev);
1418 list_del(&entry->list);
1422 spin_unlock(&devices_lock);
1429 static struct notifier_block bt_6lowpan_dev_notifier = {
1430 .notifier_call = device_event,
1433 static int __init bt_6lowpan_init(void)
1435 lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644,
1437 &lowpan_enable_fops);
1438 lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1440 &lowpan_control_fops);
1442 return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1445 static void __exit bt_6lowpan_exit(void)
1447 debugfs_remove(lowpan_enable_debugfs);
1448 debugfs_remove(lowpan_control_debugfs);
1451 l2cap_chan_close(listen_chan, 0);
1452 l2cap_chan_put(listen_chan);
1455 disconnect_devices();
1457 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1460 module_init(bt_6lowpan_init);
1461 module_exit(bt_6lowpan_exit);
1463 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1464 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1465 MODULE_VERSION(VERSION);
1466 MODULE_LICENSE("GPL");