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 rt6_info *rt = (struct rt6_info *)skb_dst(skb);
164 int count = atomic_read(&dev->peer_count);
165 const struct in6_addr *nexthop;
166 struct lowpan_peer *peer;
167 struct neighbour *neigh;
169 BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
172 if (ipv6_addr_any(&lowpan_cb(skb)->gw)) {
173 /* There is neither route nor gateway,
174 * probably the destination is a direct peer.
178 /* There is a known gateway
180 nexthop = &lowpan_cb(skb)->gw;
183 nexthop = rt6_nexthop(rt, daddr);
185 /* We need to remember the address because it is needed
186 * by bt_xmit() when sending the packet. In bt_xmit(), the
187 * destination routing info is not set.
189 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
192 BT_DBG("gw %pI6c", nexthop);
196 list_for_each_entry_rcu(peer, &dev->peers, list) {
197 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
198 &peer->chan->dst, peer->chan->dst_type,
201 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
207 /* use the neighbour cache for matching addresses assigned by SLAAC
209 neigh = __ipv6_neigh_lookup(dev->netdev, nexthop);
211 list_for_each_entry_rcu(peer, &dev->peers, list) {
212 if (!memcmp(neigh->ha, peer->lladdr, ETH_ALEN)) {
213 neigh_release(neigh);
218 neigh_release(neigh);
226 static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
228 struct lowpan_btle_dev *entry;
229 struct lowpan_peer *peer = NULL;
233 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
234 peer = __peer_lookup_conn(entry, conn);
244 static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn)
246 struct lowpan_btle_dev *entry;
247 struct lowpan_btle_dev *dev = NULL;
251 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
252 if (conn->hcon->hdev == entry->hdev) {
263 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
265 struct sk_buff *skb_cp;
267 skb_cp = skb_copy(skb, GFP_ATOMIC);
271 return netif_rx_ni(skb_cp);
274 static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
275 struct lowpan_peer *peer)
279 saddr = peer->lladdr;
281 return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr);
284 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
285 struct lowpan_peer *peer)
287 struct sk_buff *local_skb;
290 if (!netif_running(dev))
293 if (dev->type != ARPHRD_6LOWPAN || !skb->len)
296 skb_reset_network_header(skb);
298 skb = skb_share_check(skb, GFP_ATOMIC);
302 /* check that it's our buffer */
303 if (lowpan_is_ipv6(*skb_network_header(skb))) {
304 /* Pull off the 1-byte of 6lowpan header. */
307 /* Copy the packet so that the IPv6 header is
310 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
311 skb_tailroom(skb), GFP_ATOMIC);
315 local_skb->protocol = htons(ETH_P_IPV6);
316 local_skb->pkt_type = PACKET_HOST;
317 local_skb->dev = dev;
319 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
321 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
322 kfree_skb(local_skb);
326 dev->stats.rx_bytes += skb->len;
327 dev->stats.rx_packets++;
329 consume_skb(local_skb);
331 } else if (lowpan_is_iphc(*skb_network_header(skb))) {
332 local_skb = skb_clone(skb, GFP_ATOMIC);
336 local_skb->dev = dev;
338 ret = iphc_decompress(local_skb, dev, peer);
340 BT_DBG("iphc_decompress failed: %d", ret);
341 kfree_skb(local_skb);
345 local_skb->protocol = htons(ETH_P_IPV6);
346 local_skb->pkt_type = PACKET_HOST;
348 if (give_skb_to_upper(local_skb, dev)
350 kfree_skb(local_skb);
354 dev->stats.rx_bytes += skb->len;
355 dev->stats.rx_packets++;
357 consume_skb(local_skb);
360 BT_DBG("unknown packet type");
364 return NET_RX_SUCCESS;
367 dev->stats.rx_dropped++;
371 /* Packet from BT LE device */
372 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
374 struct lowpan_btle_dev *dev;
375 struct lowpan_peer *peer;
378 peer = lookup_peer(chan->conn);
382 dev = lookup_dev(chan->conn);
383 if (!dev || !dev->netdev)
386 err = recv_pkt(skb, dev->netdev, peer);
388 BT_DBG("recv pkt %d", err);
395 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
396 bdaddr_t *peer_addr, u8 *peer_addr_type)
398 struct in6_addr ipv6_daddr;
400 struct lowpan_btle_dev *dev;
401 struct lowpan_peer *peer;
407 dev = lowpan_btle_dev(netdev);
409 memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr));
411 if (ipv6_addr_is_multicast(&ipv6_daddr)) {
412 lowpan_cb(skb)->chan = NULL;
415 BT_DBG("dest IP %pI6c", &ipv6_daddr);
417 /* The packet might be sent to 6lowpan interface
418 * because of routing (either via default route
419 * or user set route) so get peer according to
420 * the destination address.
422 peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
424 BT_DBG("no such peer");
428 daddr = peer->lladdr;
429 *peer_addr = peer->chan->dst;
430 *peer_addr_type = peer->chan->dst_type;
431 lowpan_cb(skb)->chan = peer->chan;
436 lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr);
438 err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
445 static int header_create(struct sk_buff *skb, struct net_device *netdev,
446 unsigned short type, const void *_daddr,
447 const void *_saddr, unsigned int len)
449 if (type != ETH_P_IPV6)
455 /* Packet to BT LE device */
456 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
457 struct net_device *netdev)
463 /* Remember the skb so that we can send EAGAIN to the caller if
464 * we run out of credits.
468 iv.iov_base = skb->data;
469 iv.iov_len = skb->len;
471 memset(&msg, 0, sizeof(msg));
472 iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, skb->len);
474 err = l2cap_chan_send(chan, &msg, skb->len);
476 netdev->stats.tx_bytes += err;
477 netdev->stats.tx_packets++;
482 netdev->stats.tx_errors++;
487 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
489 struct sk_buff *local_skb;
490 struct lowpan_btle_dev *entry;
495 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
496 struct lowpan_peer *pentry;
497 struct lowpan_btle_dev *dev;
499 if (entry->netdev != netdev)
502 dev = lowpan_btle_dev(entry->netdev);
504 list_for_each_entry_rcu(pentry, &dev->peers, list) {
507 local_skb = skb_clone(skb, GFP_ATOMIC);
509 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
511 &pentry->chan->dst, pentry->chan->dst_type,
512 &pentry->peer_addr, pentry->chan);
513 ret = send_pkt(pentry->chan, local_skb, netdev);
517 kfree_skb(local_skb);
526 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
532 /* We must take a copy of the skb before we modify/replace the ipv6
533 * header as the header could be used elsewhere
535 skb = skb_unshare(skb, GFP_ATOMIC);
537 return NET_XMIT_DROP;
539 /* Return values from setup_header()
540 * <0 - error, packet is dropped
541 * 0 - this is a multicast packet
542 * 1 - this is unicast packet
544 err = setup_header(skb, netdev, &addr, &addr_type);
547 return NET_XMIT_DROP;
551 if (lowpan_cb(skb)->chan) {
552 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
553 netdev->name, &addr, addr_type,
554 &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
555 err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
560 /* We need to send the packet to every device behind this
563 err = send_mcast_pkt(skb, netdev);
569 BT_DBG("ERROR: xmit failed (%d)", err);
571 return err < 0 ? NET_XMIT_DROP : err;
574 static const struct net_device_ops netdev_ops = {
575 .ndo_start_xmit = bt_xmit,
578 static const struct header_ops header_ops = {
579 .create = header_create,
582 static void netdev_setup(struct net_device *dev)
584 dev->hard_header_len = 0;
585 dev->needed_tailroom = 0;
586 dev->flags = IFF_RUNNING | IFF_MULTICAST;
587 dev->watchdog_timeo = 0;
588 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
590 dev->netdev_ops = &netdev_ops;
591 dev->header_ops = &header_ops;
592 dev->needs_free_netdev = true;
595 static struct device_type bt_type = {
599 static void ifup(struct net_device *netdev)
604 err = dev_open(netdev, NULL);
606 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
610 static void ifdown(struct net_device *netdev)
617 static void do_notify_peers(struct work_struct *work)
619 struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev,
622 netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
625 static bool is_bt_6lowpan(struct hci_conn *hcon)
627 if (hcon->type != LE_LINK)
636 static struct l2cap_chan *chan_create(void)
638 struct l2cap_chan *chan;
640 chan = l2cap_chan_create();
644 l2cap_chan_set_defaults(chan);
646 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
647 chan->mode = L2CAP_MODE_LE_FLOWCTL;
653 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
654 struct lowpan_btle_dev *dev,
657 struct lowpan_peer *peer;
659 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
664 memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
666 baswap((void *)peer->lladdr, &chan->dst);
668 lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr);
670 spin_lock(&devices_lock);
671 INIT_LIST_HEAD(&peer->list);
673 spin_unlock(&devices_lock);
675 /* Notifying peers about us needs to be done without locks held */
677 INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
678 schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
683 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
685 struct net_device *netdev;
688 netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
689 IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
694 netdev->addr_assign_type = NET_ADDR_PERM;
695 baswap((void *)netdev->dev_addr, &chan->src);
697 netdev->netdev_ops = &netdev_ops;
698 SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
699 SET_NETDEV_DEVTYPE(netdev, &bt_type);
701 *dev = lowpan_btle_dev(netdev);
702 (*dev)->netdev = netdev;
703 (*dev)->hdev = chan->conn->hcon->hdev;
704 INIT_LIST_HEAD(&(*dev)->peers);
706 spin_lock(&devices_lock);
707 INIT_LIST_HEAD(&(*dev)->list);
708 list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
709 spin_unlock(&devices_lock);
711 err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE);
713 BT_INFO("register_netdev failed %d", err);
714 spin_lock(&devices_lock);
715 list_del_rcu(&(*dev)->list);
716 spin_unlock(&devices_lock);
721 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
722 netdev->ifindex, &chan->dst, chan->dst_type,
723 &chan->src, chan->src_type);
724 set_bit(__LINK_STATE_PRESENT, &netdev->state);
732 static inline void chan_ready_cb(struct l2cap_chan *chan)
734 struct lowpan_btle_dev *dev;
735 bool new_netdev = false;
737 dev = lookup_dev(chan->conn);
739 BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
742 if (setup_netdev(chan, &dev) < 0) {
743 l2cap_chan_del(chan, -ENOENT);
749 if (!try_module_get(THIS_MODULE))
752 add_peer_chan(chan, dev, new_netdev);
756 static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
758 struct l2cap_chan *chan;
760 chan = chan_create();
764 chan->ops = pchan->ops;
766 BT_DBG("chan %p pchan %p", chan, pchan);
771 static void delete_netdev(struct work_struct *work)
773 struct lowpan_btle_dev *entry = container_of(work,
774 struct lowpan_btle_dev,
777 lowpan_unregister_netdev(entry->netdev);
779 /* The entry pointer is deleted by the netdev destructor. */
782 static void chan_close_cb(struct l2cap_chan *chan)
784 struct lowpan_btle_dev *entry;
785 struct lowpan_btle_dev *dev = NULL;
786 struct lowpan_peer *peer;
788 bool last = false, remove = true;
790 BT_DBG("chan %p conn %p", chan, chan->conn);
792 if (chan->conn && chan->conn->hcon) {
793 if (!is_bt_6lowpan(chan->conn->hcon))
796 /* If conn is set, then the netdev is also there and we should
802 spin_lock(&devices_lock);
804 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
805 dev = lowpan_btle_dev(entry->netdev);
806 peer = __peer_lookup_chan(dev, chan);
808 last = peer_del(dev, peer);
811 BT_DBG("dev %p removing %speer %p", dev,
812 last ? "last " : "1 ", peer);
813 BT_DBG("chan %p orig refcnt %d", chan,
814 kref_read(&chan->kref));
816 l2cap_chan_put(chan);
821 if (!err && last && dev && !atomic_read(&dev->peer_count)) {
822 spin_unlock(&devices_lock);
824 cancel_delayed_work_sync(&dev->notify_peers);
829 INIT_WORK(&entry->delete_netdev, delete_netdev);
830 schedule_work(&entry->delete_netdev);
833 spin_unlock(&devices_lock);
839 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
841 BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
842 state_to_string(state), err);
845 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
846 unsigned long hdr_len,
847 unsigned long len, int nb)
849 /* Note that we must allocate using GFP_ATOMIC here as
850 * this function is called originally from netdev hard xmit
851 * function in atomic context.
853 return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
856 static void chan_suspend_cb(struct l2cap_chan *chan)
858 struct lowpan_btle_dev *dev;
860 BT_DBG("chan %p suspend", chan);
862 dev = lookup_dev(chan->conn);
863 if (!dev || !dev->netdev)
866 netif_stop_queue(dev->netdev);
869 static void chan_resume_cb(struct l2cap_chan *chan)
871 struct lowpan_btle_dev *dev;
873 BT_DBG("chan %p resume", chan);
875 dev = lookup_dev(chan->conn);
876 if (!dev || !dev->netdev)
879 netif_wake_queue(dev->netdev);
882 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
884 return L2CAP_CONN_TIMEOUT;
887 static const struct l2cap_ops bt_6lowpan_chan_ops = {
888 .name = "L2CAP 6LoWPAN channel",
889 .new_connection = chan_new_conn_cb,
890 .recv = chan_recv_cb,
891 .close = chan_close_cb,
892 .state_change = chan_state_change_cb,
893 .ready = chan_ready_cb,
894 .resume = chan_resume_cb,
895 .suspend = chan_suspend_cb,
896 .get_sndtimeo = chan_get_sndtimeo_cb,
897 .alloc_skb = chan_alloc_skb_cb,
899 .teardown = l2cap_chan_no_teardown,
900 .defer = l2cap_chan_no_defer,
901 .set_shutdown = l2cap_chan_no_set_shutdown,
904 static inline __u8 bdaddr_type(__u8 type)
906 if (type == ADDR_LE_DEV_PUBLIC)
907 return BDADDR_LE_PUBLIC;
909 return BDADDR_LE_RANDOM;
912 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
914 struct l2cap_chan *chan;
917 chan = chan_create();
921 chan->ops = &bt_6lowpan_chan_ops;
923 err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
926 BT_DBG("chan %p err %d", chan, err);
928 l2cap_chan_put(chan);
933 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
935 struct lowpan_peer *peer;
937 BT_DBG("conn %p dst type %d", conn, dst_type);
939 peer = lookup_peer(conn);
943 BT_DBG("peer %p chan %p", peer, peer->chan);
945 l2cap_chan_close(peer->chan, ENOENT);
950 static struct l2cap_chan *bt_6lowpan_listen(void)
952 bdaddr_t *addr = BDADDR_ANY;
953 struct l2cap_chan *chan;
959 chan = chan_create();
963 chan->ops = &bt_6lowpan_chan_ops;
964 chan->state = BT_LISTEN;
965 chan->src_type = BDADDR_LE_PUBLIC;
967 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
969 BT_DBG("chan %p src type %d", chan, chan->src_type);
971 err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
973 l2cap_chan_put(chan);
974 BT_ERR("psm cannot be added err %d", err);
981 static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
982 struct l2cap_conn **conn)
984 struct hci_conn *hcon;
985 struct hci_dev *hdev;
988 n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
989 &addr->b[5], &addr->b[4], &addr->b[3],
990 &addr->b[2], &addr->b[1], &addr->b[0],
996 /* The LE_PUBLIC address type is ignored because of BDADDR_ANY */
997 hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC);
1002 hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type);
1003 hci_dev_unlock(hdev);
1008 *conn = (struct l2cap_conn *)hcon->l2cap_data;
1010 BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1015 static void disconnect_all_peers(void)
1017 struct lowpan_btle_dev *entry;
1018 struct lowpan_peer *peer, *tmp_peer, *new_peer;
1019 struct list_head peers;
1021 INIT_LIST_HEAD(&peers);
1023 /* We make a separate list of peers as the close_cb() will
1024 * modify the device peers list so it is better not to mess
1025 * with the same list at the same time.
1030 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1031 list_for_each_entry_rcu(peer, &entry->peers, list) {
1032 new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1036 new_peer->chan = peer->chan;
1037 INIT_LIST_HEAD(&new_peer->list);
1039 list_add(&new_peer->list, &peers);
1045 spin_lock(&devices_lock);
1046 list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1047 l2cap_chan_close(peer->chan, ENOENT);
1049 list_del_rcu(&peer->list);
1050 kfree_rcu(peer, rcu);
1052 spin_unlock(&devices_lock);
1056 struct work_struct work;
1060 static void do_enable_set(struct work_struct *work)
1062 struct set_enable *set_enable = container_of(work,
1063 struct set_enable, work);
1065 if (!set_enable->flag || enable_6lowpan != set_enable->flag)
1066 /* Disconnect existing connections if 6lowpan is
1069 disconnect_all_peers();
1071 enable_6lowpan = set_enable->flag;
1074 l2cap_chan_close(listen_chan, 0);
1075 l2cap_chan_put(listen_chan);
1078 listen_chan = bt_6lowpan_listen();
1083 static int lowpan_enable_set(void *data, u64 val)
1085 struct set_enable *set_enable;
1087 set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
1091 set_enable->flag = !!val;
1092 INIT_WORK(&set_enable->work, do_enable_set);
1094 schedule_work(&set_enable->work);
1099 static int lowpan_enable_get(void *data, u64 *val)
1101 *val = enable_6lowpan;
1105 DEFINE_DEBUGFS_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
1106 lowpan_enable_set, "%llu\n");
1108 static ssize_t lowpan_control_write(struct file *fp,
1109 const char __user *user_buffer,
1114 size_t buf_size = min(count, sizeof(buf) - 1);
1118 struct l2cap_conn *conn = NULL;
1120 if (copy_from_user(buf, user_buffer, buf_size))
1123 buf[buf_size] = '\0';
1125 if (memcmp(buf, "connect ", 8) == 0) {
1126 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1131 l2cap_chan_close(listen_chan, 0);
1132 l2cap_chan_put(listen_chan);
1137 struct lowpan_peer *peer;
1139 if (!is_bt_6lowpan(conn->hcon))
1142 peer = lookup_peer(conn);
1144 BT_DBG("6LoWPAN connection already exists");
1148 BT_DBG("conn %p dst %pMR type %d user %d", conn,
1149 &conn->hcon->dst, conn->hcon->dst_type,
1153 ret = bt_6lowpan_connect(&addr, addr_type);
1160 if (memcmp(buf, "disconnect ", 11) == 0) {
1161 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1165 ret = bt_6lowpan_disconnect(conn, addr_type);
1175 static int lowpan_control_show(struct seq_file *f, void *ptr)
1177 struct lowpan_btle_dev *entry;
1178 struct lowpan_peer *peer;
1180 spin_lock(&devices_lock);
1182 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1183 list_for_each_entry(peer, &entry->peers, list)
1184 seq_printf(f, "%pMR (type %u)\n",
1185 &peer->chan->dst, peer->chan->dst_type);
1188 spin_unlock(&devices_lock);
1193 static int lowpan_control_open(struct inode *inode, struct file *file)
1195 return single_open(file, lowpan_control_show, inode->i_private);
1198 static const struct file_operations lowpan_control_fops = {
1199 .open = lowpan_control_open,
1201 .write = lowpan_control_write,
1202 .llseek = seq_lseek,
1203 .release = single_release,
1206 static void disconnect_devices(void)
1208 struct lowpan_btle_dev *entry, *tmp, *new_dev;
1209 struct list_head devices;
1211 INIT_LIST_HEAD(&devices);
1213 /* We make a separate list of devices because the unregister_netdev()
1214 * will call device_event() which will also want to modify the same
1220 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1221 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1225 new_dev->netdev = entry->netdev;
1226 INIT_LIST_HEAD(&new_dev->list);
1228 list_add_rcu(&new_dev->list, &devices);
1233 list_for_each_entry_safe(entry, tmp, &devices, list) {
1234 ifdown(entry->netdev);
1235 BT_DBG("Unregistering netdev %s %p",
1236 entry->netdev->name, entry->netdev);
1237 lowpan_unregister_netdev(entry->netdev);
1242 static int device_event(struct notifier_block *unused,
1243 unsigned long event, void *ptr)
1245 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1246 struct lowpan_btle_dev *entry;
1248 if (netdev->type != ARPHRD_6LOWPAN)
1252 case NETDEV_UNREGISTER:
1253 spin_lock(&devices_lock);
1254 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1255 if (entry->netdev == netdev) {
1256 BT_DBG("Unregistered netdev %s %p",
1257 netdev->name, netdev);
1258 list_del(&entry->list);
1262 spin_unlock(&devices_lock);
1269 static struct notifier_block bt_6lowpan_dev_notifier = {
1270 .notifier_call = device_event,
1273 static int __init bt_6lowpan_init(void)
1275 lowpan_enable_debugfs = debugfs_create_file_unsafe("6lowpan_enable",
1278 &lowpan_enable_fops);
1279 lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1281 &lowpan_control_fops);
1283 return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1286 static void __exit bt_6lowpan_exit(void)
1288 debugfs_remove(lowpan_enable_debugfs);
1289 debugfs_remove(lowpan_control_debugfs);
1292 l2cap_chan_close(listen_chan, 0);
1293 l2cap_chan_put(listen_chan);
1296 disconnect_devices();
1298 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1301 module_init(bt_6lowpan_init);
1302 module_exit(bt_6lowpan_exit);
1304 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1305 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1306 MODULE_VERSION(VERSION);
1307 MODULE_LICENSE("GPL");