1 // SPDX-License-Identifier: GPL-2.0-only
3 Copyright (c) 2013-2014 Intel Corp.
7 #include <linux/if_arp.h>
8 #include <linux/netdevice.h>
9 #include <linux/etherdevice.h>
10 #include <linux/module.h>
11 #include <linux/debugfs.h>
14 #include <net/ip6_route.h>
15 #include <net/addrconf.h>
16 #include <net/pkt_sched.h>
18 #include <net/bluetooth/bluetooth.h>
19 #include <net/bluetooth/hci_core.h>
20 #include <net/bluetooth/l2cap.h>
22 #include <net/6lowpan.h> /* for the compression support */
26 static struct dentry *lowpan_enable_debugfs;
27 static struct dentry *lowpan_control_debugfs;
29 #define IFACE_NAME_TEMPLATE "bt%d"
34 struct l2cap_chan *chan;
36 #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
38 /* The devices list contains those devices that we are acting
39 * as a proxy. The BT 6LoWPAN device is a virtual device that
40 * connects to the Bluetooth LE device. The real connection to
41 * BT device is done via l2cap layer. There exists one
42 * virtual device / one BT 6LoWPAN network (=hciX device).
43 * The list contains struct lowpan_dev elements.
45 static LIST_HEAD(bt_6lowpan_devices);
46 static DEFINE_SPINLOCK(devices_lock);
48 static bool enable_6lowpan;
50 /* We are listening incoming connections via this channel
52 static struct l2cap_chan *listen_chan;
55 struct list_head list;
57 struct l2cap_chan *chan;
59 /* peer addresses in various formats */
60 unsigned char lladdr[ETH_ALEN];
61 struct in6_addr peer_addr;
64 struct lowpan_btle_dev {
65 struct list_head list;
68 struct net_device *netdev;
69 struct list_head peers;
70 atomic_t peer_count; /* number of items in peers list */
72 struct work_struct delete_netdev;
73 struct delayed_work notify_peers;
76 static inline struct lowpan_btle_dev *
77 lowpan_btle_dev(const struct net_device *netdev)
79 return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv;
82 static inline void peer_add(struct lowpan_btle_dev *dev,
83 struct lowpan_peer *peer)
85 list_add_rcu(&peer->list, &dev->peers);
86 atomic_inc(&dev->peer_count);
89 static inline bool peer_del(struct lowpan_btle_dev *dev,
90 struct lowpan_peer *peer)
92 list_del_rcu(&peer->list);
95 module_put(THIS_MODULE);
97 if (atomic_dec_and_test(&dev->peer_count)) {
105 static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_btle_dev *dev,
106 bdaddr_t *ba, __u8 type)
108 struct lowpan_peer *peer;
110 BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
115 list_for_each_entry_rcu(peer, &dev->peers, list) {
116 BT_DBG("dst addr %pMR dst type %d",
117 &peer->chan->dst, peer->chan->dst_type);
119 if (bacmp(&peer->chan->dst, ba))
122 if (type == peer->chan->dst_type) {
133 static inline struct lowpan_peer *
134 __peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan)
136 struct lowpan_peer *peer;
138 list_for_each_entry_rcu(peer, &dev->peers, list) {
139 if (peer->chan == chan)
146 static inline struct lowpan_peer *
147 __peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn)
149 struct lowpan_peer *peer;
151 list_for_each_entry_rcu(peer, &dev->peers, list) {
152 if (peer->chan->conn == conn)
159 static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev,
160 struct in6_addr *daddr,
163 struct lowpan_peer *peer;
164 struct in6_addr *nexthop;
165 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
166 int count = atomic_read(&dev->peer_count);
168 BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
170 /* If we have multiple 6lowpan peers, then check where we should
171 * send the packet. If only one peer exists, then we can send the
176 peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer,
183 nexthop = &lowpan_cb(skb)->gw;
185 if (ipv6_addr_any(nexthop))
188 nexthop = rt6_nexthop(rt, daddr);
190 /* We need to remember the address because it is needed
191 * by bt_xmit() when sending the packet. In bt_xmit(), the
192 * destination routing info is not set.
194 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
197 BT_DBG("gw %pI6c", nexthop);
201 list_for_each_entry_rcu(peer, &dev->peers, list) {
202 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
203 &peer->chan->dst, peer->chan->dst_type,
206 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
217 static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
219 struct lowpan_btle_dev *entry;
220 struct lowpan_peer *peer = NULL;
224 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
225 peer = __peer_lookup_conn(entry, conn);
235 static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn)
237 struct lowpan_btle_dev *entry;
238 struct lowpan_btle_dev *dev = NULL;
242 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
243 if (conn->hcon->hdev == entry->hdev) {
254 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
256 struct sk_buff *skb_cp;
258 skb_cp = skb_copy(skb, GFP_ATOMIC);
262 return netif_rx_ni(skb_cp);
265 static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
266 struct lowpan_peer *peer)
270 saddr = peer->lladdr;
272 return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr);
275 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
276 struct lowpan_peer *peer)
278 struct sk_buff *local_skb;
281 if (!netif_running(dev))
284 if (dev->type != ARPHRD_6LOWPAN || !skb->len)
287 skb_reset_network_header(skb);
289 skb = skb_share_check(skb, GFP_ATOMIC);
293 /* check that it's our buffer */
294 if (lowpan_is_ipv6(*skb_network_header(skb))) {
295 /* Pull off the 1-byte of 6lowpan header. */
298 /* Copy the packet so that the IPv6 header is
301 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
302 skb_tailroom(skb), GFP_ATOMIC);
306 local_skb->protocol = htons(ETH_P_IPV6);
307 local_skb->pkt_type = PACKET_HOST;
308 local_skb->dev = dev;
310 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
312 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
313 kfree_skb(local_skb);
317 dev->stats.rx_bytes += skb->len;
318 dev->stats.rx_packets++;
320 consume_skb(local_skb);
322 } else if (lowpan_is_iphc(*skb_network_header(skb))) {
323 local_skb = skb_clone(skb, GFP_ATOMIC);
327 local_skb->dev = dev;
329 ret = iphc_decompress(local_skb, dev, peer);
331 BT_DBG("iphc_decompress failed: %d", ret);
332 kfree_skb(local_skb);
336 local_skb->protocol = htons(ETH_P_IPV6);
337 local_skb->pkt_type = PACKET_HOST;
339 if (give_skb_to_upper(local_skb, dev)
341 kfree_skb(local_skb);
345 dev->stats.rx_bytes += skb->len;
346 dev->stats.rx_packets++;
348 consume_skb(local_skb);
351 BT_DBG("unknown packet type");
355 return NET_RX_SUCCESS;
358 dev->stats.rx_dropped++;
362 /* Packet from BT LE device */
363 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
365 struct lowpan_btle_dev *dev;
366 struct lowpan_peer *peer;
369 peer = lookup_peer(chan->conn);
373 dev = lookup_dev(chan->conn);
374 if (!dev || !dev->netdev)
377 err = recv_pkt(skb, dev->netdev, peer);
379 BT_DBG("recv pkt %d", err);
386 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
387 bdaddr_t *peer_addr, u8 *peer_addr_type)
389 struct in6_addr ipv6_daddr;
391 struct lowpan_btle_dev *dev;
392 struct lowpan_peer *peer;
398 dev = lowpan_btle_dev(netdev);
400 memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr));
402 if (ipv6_addr_is_multicast(&ipv6_daddr)) {
403 lowpan_cb(skb)->chan = NULL;
406 BT_DBG("dest IP %pI6c", &ipv6_daddr);
408 /* The packet might be sent to 6lowpan interface
409 * because of routing (either via default route
410 * or user set route) so get peer according to
411 * the destination address.
413 peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
415 BT_DBG("no such peer");
419 daddr = peer->lladdr;
420 *peer_addr = peer->chan->dst;
421 *peer_addr_type = peer->chan->dst_type;
422 lowpan_cb(skb)->chan = peer->chan;
427 lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr);
429 err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
436 static int header_create(struct sk_buff *skb, struct net_device *netdev,
437 unsigned short type, const void *_daddr,
438 const void *_saddr, unsigned int len)
440 if (type != ETH_P_IPV6)
446 /* Packet to BT LE device */
447 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
448 struct net_device *netdev)
454 /* Remember the skb so that we can send EAGAIN to the caller if
455 * we run out of credits.
459 iv.iov_base = skb->data;
460 iv.iov_len = skb->len;
462 memset(&msg, 0, sizeof(msg));
463 iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, skb->len);
465 err = l2cap_chan_send(chan, &msg, skb->len);
467 netdev->stats.tx_bytes += err;
468 netdev->stats.tx_packets++;
473 netdev->stats.tx_errors++;
478 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
480 struct sk_buff *local_skb;
481 struct lowpan_btle_dev *entry;
486 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
487 struct lowpan_peer *pentry;
488 struct lowpan_btle_dev *dev;
490 if (entry->netdev != netdev)
493 dev = lowpan_btle_dev(entry->netdev);
495 list_for_each_entry_rcu(pentry, &dev->peers, list) {
498 local_skb = skb_clone(skb, GFP_ATOMIC);
500 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
502 &pentry->chan->dst, pentry->chan->dst_type,
503 &pentry->peer_addr, pentry->chan);
504 ret = send_pkt(pentry->chan, local_skb, netdev);
508 kfree_skb(local_skb);
517 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
523 /* We must take a copy of the skb before we modify/replace the ipv6
524 * header as the header could be used elsewhere
526 skb = skb_unshare(skb, GFP_ATOMIC);
528 return NET_XMIT_DROP;
530 /* Return values from setup_header()
531 * <0 - error, packet is dropped
532 * 0 - this is a multicast packet
533 * 1 - this is unicast packet
535 err = setup_header(skb, netdev, &addr, &addr_type);
538 return NET_XMIT_DROP;
542 if (lowpan_cb(skb)->chan) {
543 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
544 netdev->name, &addr, addr_type,
545 &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
546 err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
551 /* We need to send the packet to every device behind this
554 err = send_mcast_pkt(skb, netdev);
560 BT_DBG("ERROR: xmit failed (%d)", err);
562 return err < 0 ? NET_XMIT_DROP : err;
565 static int bt_dev_init(struct net_device *dev)
567 netdev_lockdep_set_classes(dev);
572 static const struct net_device_ops netdev_ops = {
573 .ndo_init = bt_dev_init,
574 .ndo_start_xmit = bt_xmit,
577 static struct header_ops header_ops = {
578 .create = header_create,
581 static void netdev_setup(struct net_device *dev)
583 dev->hard_header_len = 0;
584 dev->needed_tailroom = 0;
585 dev->flags = IFF_RUNNING | IFF_MULTICAST;
586 dev->watchdog_timeo = 0;
587 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
589 dev->netdev_ops = &netdev_ops;
590 dev->header_ops = &header_ops;
591 dev->needs_free_netdev = true;
594 static struct device_type bt_type = {
598 static void ifup(struct net_device *netdev)
603 err = dev_open(netdev, NULL);
605 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
609 static void ifdown(struct net_device *netdev)
616 static void do_notify_peers(struct work_struct *work)
618 struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev,
621 netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
624 static bool is_bt_6lowpan(struct hci_conn *hcon)
626 if (hcon->type != LE_LINK)
635 static struct l2cap_chan *chan_create(void)
637 struct l2cap_chan *chan;
639 chan = l2cap_chan_create();
643 l2cap_chan_set_defaults(chan);
645 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
646 chan->mode = L2CAP_MODE_LE_FLOWCTL;
652 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
653 struct lowpan_btle_dev *dev,
656 struct lowpan_peer *peer;
658 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
663 memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
665 baswap((void *)peer->lladdr, &chan->dst);
667 lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr);
669 spin_lock(&devices_lock);
670 INIT_LIST_HEAD(&peer->list);
672 spin_unlock(&devices_lock);
674 /* Notifying peers about us needs to be done without locks held */
676 INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
677 schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
682 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
684 struct net_device *netdev;
687 netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
688 IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
693 netdev->addr_assign_type = NET_ADDR_PERM;
694 baswap((void *)netdev->dev_addr, &chan->src);
696 netdev->netdev_ops = &netdev_ops;
697 SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
698 SET_NETDEV_DEVTYPE(netdev, &bt_type);
700 *dev = lowpan_btle_dev(netdev);
701 (*dev)->netdev = netdev;
702 (*dev)->hdev = chan->conn->hcon->hdev;
703 INIT_LIST_HEAD(&(*dev)->peers);
705 spin_lock(&devices_lock);
706 INIT_LIST_HEAD(&(*dev)->list);
707 list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
708 spin_unlock(&devices_lock);
710 err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE);
712 BT_INFO("register_netdev failed %d", err);
713 spin_lock(&devices_lock);
714 list_del_rcu(&(*dev)->list);
715 spin_unlock(&devices_lock);
720 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
721 netdev->ifindex, &chan->dst, chan->dst_type,
722 &chan->src, chan->src_type);
723 set_bit(__LINK_STATE_PRESENT, &netdev->state);
731 static inline void chan_ready_cb(struct l2cap_chan *chan)
733 struct lowpan_btle_dev *dev;
734 bool new_netdev = false;
736 dev = lookup_dev(chan->conn);
738 BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
741 if (setup_netdev(chan, &dev) < 0) {
742 l2cap_chan_del(chan, -ENOENT);
748 if (!try_module_get(THIS_MODULE))
751 add_peer_chan(chan, dev, new_netdev);
755 static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
757 struct l2cap_chan *chan;
759 chan = chan_create();
763 chan->ops = pchan->ops;
765 BT_DBG("chan %p pchan %p", chan, pchan);
770 static void delete_netdev(struct work_struct *work)
772 struct lowpan_btle_dev *entry = container_of(work,
773 struct lowpan_btle_dev,
776 lowpan_unregister_netdev(entry->netdev);
778 /* The entry pointer is deleted by the netdev destructor. */
781 static void chan_close_cb(struct l2cap_chan *chan)
783 struct lowpan_btle_dev *entry;
784 struct lowpan_btle_dev *dev = NULL;
785 struct lowpan_peer *peer;
787 bool last = false, remove = true;
789 BT_DBG("chan %p conn %p", chan, chan->conn);
791 if (chan->conn && chan->conn->hcon) {
792 if (!is_bt_6lowpan(chan->conn->hcon))
795 /* If conn is set, then the netdev is also there and we should
801 spin_lock(&devices_lock);
803 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
804 dev = lowpan_btle_dev(entry->netdev);
805 peer = __peer_lookup_chan(dev, chan);
807 last = peer_del(dev, peer);
810 BT_DBG("dev %p removing %speer %p", dev,
811 last ? "last " : "1 ", peer);
812 BT_DBG("chan %p orig refcnt %d", chan,
813 kref_read(&chan->kref));
815 l2cap_chan_put(chan);
820 if (!err && last && dev && !atomic_read(&dev->peer_count)) {
821 spin_unlock(&devices_lock);
823 cancel_delayed_work_sync(&dev->notify_peers);
828 INIT_WORK(&entry->delete_netdev, delete_netdev);
829 schedule_work(&entry->delete_netdev);
832 spin_unlock(&devices_lock);
838 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
840 BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
841 state_to_string(state), err);
844 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
845 unsigned long hdr_len,
846 unsigned long len, int nb)
848 /* Note that we must allocate using GFP_ATOMIC here as
849 * this function is called originally from netdev hard xmit
850 * function in atomic context.
852 return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
855 static void chan_suspend_cb(struct l2cap_chan *chan)
857 struct lowpan_btle_dev *dev;
859 BT_DBG("chan %p suspend", chan);
861 dev = lookup_dev(chan->conn);
862 if (!dev || !dev->netdev)
865 netif_stop_queue(dev->netdev);
868 static void chan_resume_cb(struct l2cap_chan *chan)
870 struct lowpan_btle_dev *dev;
872 BT_DBG("chan %p resume", chan);
874 dev = lookup_dev(chan->conn);
875 if (!dev || !dev->netdev)
878 netif_wake_queue(dev->netdev);
881 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
883 return L2CAP_CONN_TIMEOUT;
886 static const struct l2cap_ops bt_6lowpan_chan_ops = {
887 .name = "L2CAP 6LoWPAN channel",
888 .new_connection = chan_new_conn_cb,
889 .recv = chan_recv_cb,
890 .close = chan_close_cb,
891 .state_change = chan_state_change_cb,
892 .ready = chan_ready_cb,
893 .resume = chan_resume_cb,
894 .suspend = chan_suspend_cb,
895 .get_sndtimeo = chan_get_sndtimeo_cb,
896 .alloc_skb = chan_alloc_skb_cb,
898 .teardown = l2cap_chan_no_teardown,
899 .defer = l2cap_chan_no_defer,
900 .set_shutdown = l2cap_chan_no_set_shutdown,
903 static inline __u8 bdaddr_type(__u8 type)
905 if (type == ADDR_LE_DEV_PUBLIC)
906 return BDADDR_LE_PUBLIC;
908 return BDADDR_LE_RANDOM;
911 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
913 struct l2cap_chan *chan;
916 chan = chan_create();
920 chan->ops = &bt_6lowpan_chan_ops;
922 err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
925 BT_DBG("chan %p err %d", chan, err);
927 l2cap_chan_put(chan);
932 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
934 struct lowpan_peer *peer;
936 BT_DBG("conn %p dst type %d", conn, dst_type);
938 peer = lookup_peer(conn);
942 BT_DBG("peer %p chan %p", peer, peer->chan);
944 l2cap_chan_close(peer->chan, ENOENT);
949 static struct l2cap_chan *bt_6lowpan_listen(void)
951 bdaddr_t *addr = BDADDR_ANY;
952 struct l2cap_chan *chan;
958 chan = chan_create();
962 chan->ops = &bt_6lowpan_chan_ops;
963 chan->state = BT_LISTEN;
964 chan->src_type = BDADDR_LE_PUBLIC;
966 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
968 BT_DBG("chan %p src type %d", chan, chan->src_type);
970 err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
972 l2cap_chan_put(chan);
973 BT_ERR("psm cannot be added err %d", err);
980 static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
981 struct l2cap_conn **conn)
983 struct hci_conn *hcon;
984 struct hci_dev *hdev;
987 n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
988 &addr->b[5], &addr->b[4], &addr->b[3],
989 &addr->b[2], &addr->b[1], &addr->b[0],
995 /* The LE_PUBLIC address type is ignored because of BDADDR_ANY */
996 hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC);
1001 hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type);
1002 hci_dev_unlock(hdev);
1007 *conn = (struct l2cap_conn *)hcon->l2cap_data;
1009 BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1014 static void disconnect_all_peers(void)
1016 struct lowpan_btle_dev *entry;
1017 struct lowpan_peer *peer, *tmp_peer, *new_peer;
1018 struct list_head peers;
1020 INIT_LIST_HEAD(&peers);
1022 /* We make a separate list of peers as the close_cb() will
1023 * modify the device peers list so it is better not to mess
1024 * with the same list at the same time.
1029 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1030 list_for_each_entry_rcu(peer, &entry->peers, list) {
1031 new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1035 new_peer->chan = peer->chan;
1036 INIT_LIST_HEAD(&new_peer->list);
1038 list_add(&new_peer->list, &peers);
1044 spin_lock(&devices_lock);
1045 list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1046 l2cap_chan_close(peer->chan, ENOENT);
1048 list_del_rcu(&peer->list);
1049 kfree_rcu(peer, rcu);
1051 spin_unlock(&devices_lock);
1055 struct work_struct work;
1059 static void do_enable_set(struct work_struct *work)
1061 struct set_enable *set_enable = container_of(work,
1062 struct set_enable, work);
1064 if (!set_enable->flag || enable_6lowpan != set_enable->flag)
1065 /* Disconnect existing connections if 6lowpan is
1068 disconnect_all_peers();
1070 enable_6lowpan = set_enable->flag;
1073 l2cap_chan_close(listen_chan, 0);
1074 l2cap_chan_put(listen_chan);
1077 listen_chan = bt_6lowpan_listen();
1082 static int lowpan_enable_set(void *data, u64 val)
1084 struct set_enable *set_enable;
1086 set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
1090 set_enable->flag = !!val;
1091 INIT_WORK(&set_enable->work, do_enable_set);
1093 schedule_work(&set_enable->work);
1098 static int lowpan_enable_get(void *data, u64 *val)
1100 *val = enable_6lowpan;
1104 DEFINE_DEBUGFS_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
1105 lowpan_enable_set, "%llu\n");
1107 static ssize_t lowpan_control_write(struct file *fp,
1108 const char __user *user_buffer,
1113 size_t buf_size = min(count, sizeof(buf) - 1);
1117 struct l2cap_conn *conn = NULL;
1119 if (copy_from_user(buf, user_buffer, buf_size))
1122 buf[buf_size] = '\0';
1124 if (memcmp(buf, "connect ", 8) == 0) {
1125 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1130 l2cap_chan_close(listen_chan, 0);
1131 l2cap_chan_put(listen_chan);
1136 struct lowpan_peer *peer;
1138 if (!is_bt_6lowpan(conn->hcon))
1141 peer = lookup_peer(conn);
1143 BT_DBG("6LoWPAN connection already exists");
1147 BT_DBG("conn %p dst %pMR type %d user %d", conn,
1148 &conn->hcon->dst, conn->hcon->dst_type,
1152 ret = bt_6lowpan_connect(&addr, addr_type);
1159 if (memcmp(buf, "disconnect ", 11) == 0) {
1160 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1164 ret = bt_6lowpan_disconnect(conn, addr_type);
1174 static int lowpan_control_show(struct seq_file *f, void *ptr)
1176 struct lowpan_btle_dev *entry;
1177 struct lowpan_peer *peer;
1179 spin_lock(&devices_lock);
1181 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1182 list_for_each_entry(peer, &entry->peers, list)
1183 seq_printf(f, "%pMR (type %u)\n",
1184 &peer->chan->dst, peer->chan->dst_type);
1187 spin_unlock(&devices_lock);
1192 static int lowpan_control_open(struct inode *inode, struct file *file)
1194 return single_open(file, lowpan_control_show, inode->i_private);
1197 static const struct file_operations lowpan_control_fops = {
1198 .open = lowpan_control_open,
1200 .write = lowpan_control_write,
1201 .llseek = seq_lseek,
1202 .release = single_release,
1205 static void disconnect_devices(void)
1207 struct lowpan_btle_dev *entry, *tmp, *new_dev;
1208 struct list_head devices;
1210 INIT_LIST_HEAD(&devices);
1212 /* We make a separate list of devices because the unregister_netdev()
1213 * will call device_event() which will also want to modify the same
1219 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1220 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1224 new_dev->netdev = entry->netdev;
1225 INIT_LIST_HEAD(&new_dev->list);
1227 list_add_rcu(&new_dev->list, &devices);
1232 list_for_each_entry_safe(entry, tmp, &devices, list) {
1233 ifdown(entry->netdev);
1234 BT_DBG("Unregistering netdev %s %p",
1235 entry->netdev->name, entry->netdev);
1236 lowpan_unregister_netdev(entry->netdev);
1241 static int device_event(struct notifier_block *unused,
1242 unsigned long event, void *ptr)
1244 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1245 struct lowpan_btle_dev *entry;
1247 if (netdev->type != ARPHRD_6LOWPAN)
1251 case NETDEV_UNREGISTER:
1252 spin_lock(&devices_lock);
1253 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1254 if (entry->netdev == netdev) {
1255 BT_DBG("Unregistered netdev %s %p",
1256 netdev->name, netdev);
1257 list_del(&entry->list);
1261 spin_unlock(&devices_lock);
1268 static struct notifier_block bt_6lowpan_dev_notifier = {
1269 .notifier_call = device_event,
1272 static int __init bt_6lowpan_init(void)
1274 lowpan_enable_debugfs = debugfs_create_file_unsafe("6lowpan_enable",
1277 &lowpan_enable_fops);
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_enable_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");