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_psm_debugfs;
35 static struct dentry *lowpan_control_debugfs;
37 #define IFACE_NAME_TEMPLATE "bt%d"
38 #define EUI64_ADDR_LEN 8
42 struct l2cap_chan *chan;
45 #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
47 /* The devices list contains those devices that we are acting
48 * as a proxy. The BT 6LoWPAN device is a virtual device that
49 * connects to the Bluetooth LE device. The real connection to
50 * BT device is done via l2cap layer. There exists one
51 * virtual device / one BT 6LoWPAN network (=hciX device).
52 * The list contains struct lowpan_dev elements.
54 static LIST_HEAD(bt_6lowpan_devices);
55 static DEFINE_RWLOCK(devices_lock);
57 /* If psm is set to 0 (default value), then 6lowpan is disabled.
58 * Other values are used to indicate a Protocol Service Multiplexer
61 static u16 psm_6lowpan;
63 /* We are listening incoming connections via this channel
65 static struct l2cap_chan *listen_chan;
68 struct list_head list;
69 struct l2cap_chan *chan;
71 /* peer addresses in various formats */
72 unsigned char eui64_addr[EUI64_ADDR_LEN];
73 struct in6_addr peer_addr;
77 struct list_head list;
80 struct net_device *netdev;
81 struct list_head peers;
82 atomic_t peer_count; /* number of items in peers list */
84 struct work_struct delete_netdev;
85 struct delayed_work notify_peers;
88 static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev)
90 return netdev_priv(netdev);
93 static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer)
95 list_add(&peer->list, &dev->peers);
96 atomic_inc(&dev->peer_count);
99 static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer)
101 list_del(&peer->list);
103 module_put(THIS_MODULE);
105 if (atomic_dec_and_test(&dev->peer_count)) {
113 static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev,
114 bdaddr_t *ba, __u8 type)
116 struct lowpan_peer *peer, *tmp;
118 BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
121 list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
122 BT_DBG("dst addr %pMR dst type %d",
123 &peer->chan->dst, peer->chan->dst_type);
125 if (bacmp(&peer->chan->dst, ba))
128 if (type == peer->chan->dst_type)
135 static inline struct lowpan_peer *peer_lookup_chan(struct lowpan_dev *dev,
136 struct l2cap_chan *chan)
138 struct lowpan_peer *peer, *tmp;
140 list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
141 if (peer->chan == chan)
148 static inline struct lowpan_peer *peer_lookup_conn(struct lowpan_dev *dev,
149 struct l2cap_conn *conn)
151 struct lowpan_peer *peer, *tmp;
153 list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
154 if (peer->chan->conn == conn)
161 static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
163 struct lowpan_dev *entry, *tmp;
164 struct lowpan_peer *peer = NULL;
167 read_lock_irqsave(&devices_lock, flags);
169 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
170 peer = peer_lookup_conn(entry, conn);
175 read_unlock_irqrestore(&devices_lock, flags);
180 static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn)
182 struct lowpan_dev *entry, *tmp;
183 struct lowpan_dev *dev = NULL;
186 read_lock_irqsave(&devices_lock, flags);
188 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
189 if (conn->hcon->hdev == entry->hdev) {
195 read_unlock_irqrestore(&devices_lock, flags);
200 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
202 struct sk_buff *skb_cp;
205 skb_cp = skb_copy(skb, GFP_ATOMIC);
209 ret = netif_rx(skb_cp);
211 BT_DBG("receive skb %d", ret);
218 static int process_data(struct sk_buff *skb, struct net_device *netdev,
219 struct l2cap_chan *chan)
221 const u8 *saddr, *daddr;
223 struct lowpan_dev *dev;
224 struct lowpan_peer *peer;
227 dev = lowpan_dev(netdev);
229 read_lock_irqsave(&devices_lock, flags);
230 peer = peer_lookup_chan(dev, chan);
231 read_unlock_irqrestore(&devices_lock, flags);
235 saddr = peer->eui64_addr;
236 daddr = dev->netdev->dev_addr;
238 /* at least two bytes will be used for the encoding */
242 if (lowpan_fetch_skb_u8(skb, &iphc0))
245 if (lowpan_fetch_skb_u8(skb, &iphc1))
248 return lowpan_process_data(skb, netdev,
249 saddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
250 daddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
251 iphc0, iphc1, give_skb_to_upper);
258 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
259 struct l2cap_chan *chan)
261 struct sk_buff *local_skb;
264 if (!netif_running(dev))
267 if (dev->type != ARPHRD_6LOWPAN)
270 /* check that it's our buffer */
271 if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
272 /* Copy the packet so that the IPv6 header is
275 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
276 skb_tailroom(skb), GFP_ATOMIC);
280 local_skb->protocol = htons(ETH_P_IPV6);
281 local_skb->pkt_type = PACKET_HOST;
283 skb_reset_network_header(local_skb);
284 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
286 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
287 kfree_skb(local_skb);
291 dev->stats.rx_bytes += skb->len;
292 dev->stats.rx_packets++;
294 kfree_skb(local_skb);
297 switch (skb->data[0] & 0xe0) {
298 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
299 local_skb = skb_clone(skb, GFP_ATOMIC);
303 ret = process_data(local_skb, dev, chan);
304 if (ret != NET_RX_SUCCESS)
307 dev->stats.rx_bytes += skb->len;
308 dev->stats.rx_packets++;
317 return NET_RX_SUCCESS;
320 dev->stats.rx_dropped++;
325 /* Packet from BT LE device */
326 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
328 struct lowpan_dev *dev;
329 struct lowpan_peer *peer;
332 peer = lookup_peer(chan->conn);
336 dev = lookup_dev(chan->conn);
337 if (!dev || !dev->netdev)
340 err = recv_pkt(skb, dev->netdev, chan);
342 BT_DBG("recv pkt %d", err);
349 static u8 get_addr_type_from_eui64(u8 byte)
351 /* Is universal(0) or local(1) bit */
352 return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
355 static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
357 u8 *eui64 = ip6_daddr->s6_addr + 8;
359 addr->b[0] = eui64[7];
360 addr->b[1] = eui64[6];
361 addr->b[2] = eui64[5];
362 addr->b[3] = eui64[2];
363 addr->b[4] = eui64[1];
364 addr->b[5] = eui64[0];
367 static void convert_dest_bdaddr(struct in6_addr *ip6_daddr,
368 bdaddr_t *addr, u8 *addr_type)
370 copy_to_bdaddr(ip6_daddr, addr);
372 /* We need to toggle the U/L bit that we got from IPv6 address
373 * so that we get the proper address and type of the BD address.
377 *addr_type = get_addr_type_from_eui64(addr->b[5]);
380 static int header_create(struct sk_buff *skb, struct net_device *netdev,
381 unsigned short type, const void *_daddr,
382 const void *_saddr, unsigned int len)
385 struct lowpan_dev *dev;
386 struct lowpan_peer *peer;
387 bdaddr_t addr, *any = BDADDR_ANY;
388 u8 *saddr, *daddr = any->b;
391 if (type != ETH_P_IPV6)
396 dev = lowpan_dev(netdev);
398 if (ipv6_addr_is_multicast(&hdr->daddr)) {
399 memcpy(&lowpan_cb(skb)->addr, &hdr->daddr,
400 sizeof(struct in6_addr));
401 lowpan_cb(skb)->chan = NULL;
405 /* Get destination BT device from skb.
406 * If there is no such peer then discard the packet.
408 convert_dest_bdaddr(&hdr->daddr, &addr, &addr_type);
410 BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
411 addr_type, &hdr->daddr);
413 read_lock_irqsave(&devices_lock, flags);
414 peer = peer_lookup_ba(dev, &addr, addr_type);
415 read_unlock_irqrestore(&devices_lock, flags);
418 BT_DBG("no such peer %pMR found", &addr);
422 daddr = peer->eui64_addr;
424 memcpy(&lowpan_cb(skb)->addr, &hdr->daddr,
425 sizeof(struct in6_addr));
426 lowpan_cb(skb)->chan = peer->chan;
429 saddr = dev->netdev->dev_addr;
431 return lowpan_header_compress(skb, netdev, type, daddr, saddr, len);
434 /* Packet to BT LE device */
435 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
436 struct net_device *netdev)
442 /* Remember the skb so that we can send EAGAIN to the caller if
443 * we run out of credits.
447 memset(&msg, 0, sizeof(msg));
448 msg.msg_iov = (struct iovec *) &iv;
450 iv.iov_base = skb->data;
451 iv.iov_len = skb->len;
453 err = l2cap_chan_send(chan, &msg, skb->len);
455 netdev->stats.tx_bytes += err;
456 netdev->stats.tx_packets++;
461 err = lowpan_cb(skb)->status;
465 netdev->stats.tx_dropped++;
467 netdev->stats.tx_errors++;
473 static void send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
475 struct sk_buff *local_skb;
476 struct lowpan_dev *entry, *tmp;
479 read_lock_irqsave(&devices_lock, flags);
481 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
482 struct lowpan_peer *pentry, *ptmp;
483 struct lowpan_dev *dev;
485 if (entry->netdev != netdev)
488 dev = lowpan_dev(entry->netdev);
490 list_for_each_entry_safe(pentry, ptmp, &dev->peers, list) {
491 local_skb = skb_clone(skb, GFP_ATOMIC);
493 send_pkt(pentry->chan, local_skb, netdev);
495 kfree_skb(local_skb);
499 read_unlock_irqrestore(&devices_lock, flags);
502 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
505 struct lowpan_dev *dev;
506 struct lowpan_peer *peer;
510 if (ipv6_addr_is_multicast(&lowpan_cb(skb)->addr)) {
511 /* We need to send the packet to every device
512 * behind this interface.
514 send_mcast_pkt(skb, netdev);
518 convert_dest_bdaddr(&lowpan_cb(skb)->addr, &addr, &addr_type);
519 dev = lowpan_dev(netdev);
521 read_lock_irqsave(&devices_lock, flags);
522 peer = peer_lookup_ba(dev, &addr, addr_type);
523 read_unlock_irqrestore(&devices_lock, flags);
525 BT_DBG("xmit %s to %pMR type %d IP %pI6c peer %p",
526 netdev->name, &addr, addr_type,
527 &lowpan_cb(skb)->addr, peer);
529 if (peer && peer->chan)
530 err = send_pkt(peer->chan, skb, netdev);
537 BT_DBG("ERROR: xmit failed (%d)", err);
539 return (err < 0) ? NET_XMIT_DROP : err;
542 static const struct net_device_ops netdev_ops = {
543 .ndo_start_xmit = bt_xmit,
546 static struct header_ops header_ops = {
547 .create = header_create,
550 static void netdev_setup(struct net_device *dev)
552 dev->addr_len = EUI64_ADDR_LEN;
553 dev->type = ARPHRD_6LOWPAN;
555 dev->hard_header_len = 0;
556 dev->needed_tailroom = 0;
557 dev->mtu = IPV6_MIN_MTU;
558 dev->tx_queue_len = 0;
559 dev->flags = IFF_RUNNING | IFF_POINTOPOINT;
560 dev->watchdog_timeo = 0;
562 dev->netdev_ops = &netdev_ops;
563 dev->header_ops = &header_ops;
564 dev->destructor = free_netdev;
567 static struct device_type bt_type = {
571 static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
573 /* addr is the BT address in little-endian format */
583 /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
584 if (addr_type == BDADDR_LE_PUBLIC)
589 BT_DBG("type %d addr %*phC", addr_type, 8, eui);
592 static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr,
595 netdev->addr_assign_type = NET_ADDR_PERM;
596 set_addr(netdev->dev_addr, addr->b, addr_type);
599 static void ifup(struct net_device *netdev)
604 err = dev_open(netdev);
606 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
610 static void ifdown(struct net_device *netdev)
615 err = dev_close(netdev);
617 BT_INFO("iface %s cannot be closed (%d)", netdev->name, err);
621 static void do_notify_peers(struct work_struct *work)
623 struct lowpan_dev *dev = container_of(work, struct lowpan_dev,
626 netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
629 static bool is_bt_6lowpan(struct hci_conn *hcon)
631 if (hcon->type != LE_LINK)
640 static struct l2cap_chan *chan_create(void)
642 struct l2cap_chan *chan;
644 chan = l2cap_chan_create();
648 l2cap_chan_set_defaults(chan);
650 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
651 chan->mode = L2CAP_MODE_LE_FLOWCTL;
653 chan->imtu = chan->omtu;
658 static struct l2cap_chan *chan_open(struct l2cap_chan *pchan)
660 struct l2cap_chan *chan;
662 chan = chan_create();
666 chan->remote_mps = chan->omtu;
667 chan->mps = chan->omtu;
669 chan->state = BT_CONNECTED;
674 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
675 struct lowpan_dev *dev)
677 struct lowpan_peer *peer;
680 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
685 memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
688 peer->peer_addr.s6_addr[0] = 0xFE;
689 peer->peer_addr.s6_addr[1] = 0x80;
690 set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b,
693 memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
696 write_lock_irqsave(&devices_lock, flags);
697 INIT_LIST_HEAD(&peer->list);
699 write_unlock_irqrestore(&devices_lock, flags);
701 /* Notifying peers about us needs to be done without locks held */
702 INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
703 schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
708 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
710 struct net_device *netdev;
714 netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE,
715 NET_NAME_UNKNOWN, netdev_setup);
719 set_dev_addr(netdev, &chan->src, chan->src_type);
721 netdev->netdev_ops = &netdev_ops;
722 SET_NETDEV_DEV(netdev, &chan->conn->hcon->dev);
723 SET_NETDEV_DEVTYPE(netdev, &bt_type);
725 err = register_netdev(netdev);
727 BT_INFO("register_netdev failed %d", err);
732 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
733 netdev->ifindex, &chan->dst, chan->dst_type,
734 &chan->src, chan->src_type);
735 set_bit(__LINK_STATE_PRESENT, &netdev->state);
737 *dev = netdev_priv(netdev);
738 (*dev)->netdev = netdev;
739 (*dev)->hdev = chan->conn->hcon->hdev;
740 INIT_LIST_HEAD(&(*dev)->peers);
742 write_lock_irqsave(&devices_lock, flags);
743 INIT_LIST_HEAD(&(*dev)->list);
744 list_add(&(*dev)->list, &bt_6lowpan_devices);
745 write_unlock_irqrestore(&devices_lock, flags);
753 static inline void chan_ready_cb(struct l2cap_chan *chan)
755 struct lowpan_dev *dev;
757 dev = lookup_dev(chan->conn);
759 BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
762 if (setup_netdev(chan, &dev) < 0) {
763 l2cap_chan_del(chan, -ENOENT);
768 if (!try_module_get(THIS_MODULE))
771 add_peer_chan(chan, dev);
775 static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *chan)
777 struct l2cap_chan *pchan;
779 pchan = chan_open(chan);
780 pchan->ops = chan->ops;
782 BT_DBG("chan %p pchan %p", chan, pchan);
787 static void delete_netdev(struct work_struct *work)
789 struct lowpan_dev *entry = container_of(work, struct lowpan_dev,
792 unregister_netdev(entry->netdev);
794 /* The entry pointer is deleted in device_event() */
797 static void chan_close_cb(struct l2cap_chan *chan)
799 struct lowpan_dev *entry, *tmp;
800 struct lowpan_dev *dev = NULL;
801 struct lowpan_peer *peer;
804 bool last = false, removed = true;
806 BT_DBG("chan %p conn %p", chan, chan->conn);
808 if (chan->conn && chan->conn->hcon) {
809 if (!is_bt_6lowpan(chan->conn->hcon))
812 /* If conn is set, then the netdev is also there and we should
818 write_lock_irqsave(&devices_lock, flags);
820 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
821 dev = lowpan_dev(entry->netdev);
822 peer = peer_lookup_chan(dev, chan);
824 last = peer_del(dev, peer);
827 BT_DBG("dev %p removing %speer %p", dev,
828 last ? "last " : "1 ", peer);
829 BT_DBG("chan %p orig refcnt %d", chan,
830 atomic_read(&chan->kref.refcount));
832 l2cap_chan_put(chan);
838 if (!err && last && dev && !atomic_read(&dev->peer_count)) {
839 write_unlock_irqrestore(&devices_lock, flags);
841 cancel_delayed_work_sync(&dev->notify_peers);
846 INIT_WORK(&entry->delete_netdev, delete_netdev);
847 schedule_work(&entry->delete_netdev);
850 write_unlock_irqrestore(&devices_lock, flags);
856 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
858 BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
859 state_to_string(state), err);
862 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
863 unsigned long hdr_len,
864 unsigned long len, int nb)
866 /* Note that we must allocate using GFP_ATOMIC here as
867 * this function is called originally from netdev hard xmit
868 * function in atomic context.
870 return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
873 static void chan_suspend_cb(struct l2cap_chan *chan)
875 struct sk_buff *skb = chan->data;
877 BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
879 lowpan_cb(skb)->status = -EAGAIN;
882 static void chan_resume_cb(struct l2cap_chan *chan)
884 struct sk_buff *skb = chan->data;
886 BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
888 lowpan_cb(skb)->status = 0;
891 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
893 return msecs_to_jiffies(1000);
896 static const struct l2cap_ops bt_6lowpan_chan_ops = {
897 .name = "L2CAP 6LoWPAN channel",
898 .new_connection = chan_new_conn_cb,
899 .recv = chan_recv_cb,
900 .close = chan_close_cb,
901 .state_change = chan_state_change_cb,
902 .ready = chan_ready_cb,
903 .resume = chan_resume_cb,
904 .suspend = chan_suspend_cb,
905 .get_sndtimeo = chan_get_sndtimeo_cb,
906 .alloc_skb = chan_alloc_skb_cb,
907 .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec,
909 .teardown = l2cap_chan_no_teardown,
910 .defer = l2cap_chan_no_defer,
911 .set_shutdown = l2cap_chan_no_set_shutdown,
914 static inline __u8 bdaddr_type(__u8 type)
916 if (type == ADDR_LE_DEV_PUBLIC)
917 return BDADDR_LE_PUBLIC;
919 return BDADDR_LE_RANDOM;
922 static struct l2cap_chan *chan_get(void)
924 struct l2cap_chan *pchan;
926 pchan = chan_create();
930 pchan->ops = &bt_6lowpan_chan_ops;
935 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
937 struct l2cap_chan *pchan;
944 err = l2cap_chan_connect(pchan, cpu_to_le16(psm_6lowpan), 0,
947 BT_DBG("chan %p err %d", pchan, err);
949 l2cap_chan_put(pchan);
954 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
956 struct lowpan_peer *peer;
958 BT_DBG("conn %p dst type %d", conn, dst_type);
960 peer = lookup_peer(conn);
964 BT_DBG("peer %p chan %p", peer, peer->chan);
966 l2cap_chan_close(peer->chan, ENOENT);
971 static struct l2cap_chan *bt_6lowpan_listen(void)
973 bdaddr_t *addr = BDADDR_ANY;
974 struct l2cap_chan *pchan;
977 if (psm_6lowpan == 0)
984 pchan->state = BT_LISTEN;
985 pchan->src_type = BDADDR_LE_PUBLIC;
987 BT_DBG("psm 0x%04x chan %p src type %d", psm_6lowpan, pchan,
990 err = l2cap_add_psm(pchan, addr, cpu_to_le16(psm_6lowpan));
992 l2cap_chan_put(pchan);
993 BT_ERR("psm cannot be added err %d", err);
1000 static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
1001 struct l2cap_conn **conn)
1003 struct hci_conn *hcon;
1004 struct hci_dev *hdev;
1005 bdaddr_t *src = BDADDR_ANY;
1008 n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
1009 &addr->b[5], &addr->b[4], &addr->b[3],
1010 &addr->b[2], &addr->b[1], &addr->b[0],
1016 hdev = hci_get_route(addr, src);
1021 hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr);
1022 hci_dev_unlock(hdev);
1027 *conn = (struct l2cap_conn *)hcon->l2cap_data;
1029 BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1034 static void disconnect_all_peers(void)
1036 struct lowpan_dev *entry, *tmp_dev;
1037 struct lowpan_peer *peer, *tmp_peer, *new_peer;
1038 struct list_head peers;
1039 unsigned long flags;
1041 INIT_LIST_HEAD(&peers);
1043 /* We make a separate list of peers as the close_cb() will
1044 * modify the device peers list so it is better not to mess
1045 * with the same list at the same time.
1048 read_lock_irqsave(&devices_lock, flags);
1050 list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) {
1051 list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list) {
1052 new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1056 new_peer->chan = peer->chan;
1057 INIT_LIST_HEAD(&new_peer->list);
1059 list_add(&new_peer->list, &peers);
1063 read_unlock_irqrestore(&devices_lock, flags);
1065 list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1066 l2cap_chan_close(peer->chan, ENOENT);
1071 static int lowpan_psm_set(void *data, u64 val)
1076 if (psm == 0 || psm_6lowpan != psm)
1077 /* Disconnect existing connections if 6lowpan is
1078 * disabled (psm = 0), or if psm changes.
1080 disconnect_all_peers();
1085 l2cap_chan_close(listen_chan, 0);
1086 l2cap_chan_put(listen_chan);
1089 listen_chan = bt_6lowpan_listen();
1094 static int lowpan_psm_get(void *data, u64 *val)
1100 DEFINE_SIMPLE_ATTRIBUTE(lowpan_psm_fops, lowpan_psm_get,
1101 lowpan_psm_set, "%llu\n");
1103 static ssize_t lowpan_control_write(struct file *fp,
1104 const char __user *user_buffer,
1109 size_t buf_size = min(count, sizeof(buf) - 1);
1113 struct l2cap_conn *conn = NULL;
1115 if (copy_from_user(buf, user_buffer, buf_size))
1118 buf[buf_size] = '\0';
1120 if (memcmp(buf, "connect ", 8) == 0) {
1121 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1126 l2cap_chan_close(listen_chan, 0);
1127 l2cap_chan_put(listen_chan);
1132 struct lowpan_peer *peer;
1134 if (!is_bt_6lowpan(conn->hcon))
1137 peer = lookup_peer(conn);
1139 BT_DBG("6LoWPAN connection already exists");
1143 BT_DBG("conn %p dst %pMR type %d user %d", conn,
1144 &conn->hcon->dst, conn->hcon->dst_type,
1148 ret = bt_6lowpan_connect(&addr, addr_type);
1155 if (memcmp(buf, "disconnect ", 11) == 0) {
1156 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1160 ret = bt_6lowpan_disconnect(conn, addr_type);
1170 static int lowpan_control_show(struct seq_file *f, void *ptr)
1172 struct lowpan_dev *entry, *tmp_dev;
1173 struct lowpan_peer *peer, *tmp_peer;
1174 unsigned long flags;
1176 read_lock_irqsave(&devices_lock, flags);
1178 list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) {
1179 list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list)
1180 seq_printf(f, "%pMR (type %u)\n",
1181 &peer->chan->dst, peer->chan->dst_type);
1184 read_unlock_irqrestore(&devices_lock, flags);
1189 static int lowpan_control_open(struct inode *inode, struct file *file)
1191 return single_open(file, lowpan_control_show, inode->i_private);
1194 static const struct file_operations lowpan_control_fops = {
1195 .open = lowpan_control_open,
1197 .write = lowpan_control_write,
1198 .llseek = seq_lseek,
1199 .release = single_release,
1202 static void disconnect_devices(void)
1204 struct lowpan_dev *entry, *tmp, *new_dev;
1205 struct list_head devices;
1206 unsigned long flags;
1208 INIT_LIST_HEAD(&devices);
1210 /* We make a separate list of devices because the unregister_netdev()
1211 * will call device_event() which will also want to modify the same
1215 read_lock_irqsave(&devices_lock, flags);
1217 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
1218 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1222 new_dev->netdev = entry->netdev;
1223 INIT_LIST_HEAD(&new_dev->list);
1225 list_add(&new_dev->list, &devices);
1228 read_unlock_irqrestore(&devices_lock, flags);
1230 list_for_each_entry_safe(entry, tmp, &devices, list) {
1231 ifdown(entry->netdev);
1232 BT_DBG("Unregistering netdev %s %p",
1233 entry->netdev->name, entry->netdev);
1234 unregister_netdev(entry->netdev);
1239 static int device_event(struct notifier_block *unused,
1240 unsigned long event, void *ptr)
1242 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1243 struct lowpan_dev *entry, *tmp;
1244 unsigned long flags;
1246 if (netdev->type != ARPHRD_6LOWPAN)
1250 case NETDEV_UNREGISTER:
1251 write_lock_irqsave(&devices_lock, flags);
1252 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices,
1254 if (entry->netdev == netdev) {
1255 BT_DBG("Unregistered netdev %s %p",
1256 netdev->name, netdev);
1257 list_del(&entry->list);
1262 write_unlock_irqrestore(&devices_lock, flags);
1269 static struct notifier_block bt_6lowpan_dev_notifier = {
1270 .notifier_call = device_event,
1273 static int __init bt_6lowpan_init(void)
1275 lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644,
1278 lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1280 &lowpan_control_fops);
1282 return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1285 static void __exit bt_6lowpan_exit(void)
1287 debugfs_remove(lowpan_psm_debugfs);
1288 debugfs_remove(lowpan_control_debugfs);
1291 l2cap_chan_close(listen_chan, 0);
1292 l2cap_chan_put(listen_chan);
1295 disconnect_devices();
1297 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1300 module_init(bt_6lowpan_init);
1301 module_exit(bt_6lowpan_exit);
1303 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1304 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1305 MODULE_VERSION(VERSION);
1306 MODULE_LICENSE("GPL");