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/bluetooth/bluetooth.h>
25 #include <net/bluetooth/hci_core.h>
26 #include <net/bluetooth/l2cap.h>
28 #include <net/6lowpan.h> /* for the compression support */
32 static struct dentry *lowpan_enable_debugfs;
33 static struct dentry *lowpan_control_debugfs;
35 #define IFACE_NAME_TEMPLATE "bt%d"
40 struct l2cap_chan *chan;
43 #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
45 /* The devices list contains those devices that we are acting
46 * as a proxy. The BT 6LoWPAN device is a virtual device that
47 * connects to the Bluetooth LE device. The real connection to
48 * BT device is done via l2cap layer. There exists one
49 * virtual device / one BT 6LoWPAN network (=hciX device).
50 * The list contains struct lowpan_dev elements.
52 static LIST_HEAD(bt_6lowpan_devices);
53 static DEFINE_SPINLOCK(devices_lock);
55 static bool enable_6lowpan;
57 /* We are listening incoming connections via this channel
59 static struct l2cap_chan *listen_chan;
62 struct list_head list;
64 struct l2cap_chan *chan;
66 /* peer addresses in various formats */
67 unsigned char eui64_addr[EUI64_ADDR_LEN];
68 struct in6_addr peer_addr;
71 struct lowpan_btle_dev {
72 struct list_head list;
75 struct net_device *netdev;
76 struct list_head peers;
77 atomic_t peer_count; /* number of items in peers list */
79 struct work_struct delete_netdev;
80 struct delayed_work notify_peers;
83 static inline struct lowpan_btle_dev *
84 lowpan_btle_dev(const struct net_device *netdev)
86 return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv;
89 static inline void peer_add(struct lowpan_btle_dev *dev,
90 struct lowpan_peer *peer)
92 list_add_rcu(&peer->list, &dev->peers);
93 atomic_inc(&dev->peer_count);
96 static inline bool peer_del(struct lowpan_btle_dev *dev,
97 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_btle_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 *
141 __peer_lookup_chan(struct lowpan_btle_dev *dev, 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 *
154 __peer_lookup_conn(struct lowpan_btle_dev *dev, 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_btle_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_btle_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_btle_dev *lookup_dev(struct l2cap_conn *conn)
244 struct lowpan_btle_dev *entry;
245 struct lowpan_btle_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_ni(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;
276 struct lowpan_btle_dev *dev;
277 struct lowpan_peer *peer;
279 dev = lowpan_btle_dev(netdev);
282 peer = __peer_lookup_chan(dev, chan);
287 saddr = peer->eui64_addr;
288 daddr = dev->netdev->dev_addr;
290 return lowpan_header_decompress(skb, netdev, daddr, saddr);
293 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
294 struct l2cap_chan *chan)
296 struct sk_buff *local_skb;
299 if (!netif_running(dev))
302 if (dev->type != ARPHRD_6LOWPAN || !skb->len)
305 skb_reset_network_header(skb);
307 skb = skb_share_check(skb, GFP_ATOMIC);
311 /* check that it's our buffer */
312 if (lowpan_is_ipv6(*skb_network_header(skb))) {
313 /* Pull off the 1-byte of 6lowpan header. */
316 /* Copy the packet so that the IPv6 header is
319 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
320 skb_tailroom(skb), GFP_ATOMIC);
324 local_skb->protocol = htons(ETH_P_IPV6);
325 local_skb->pkt_type = PACKET_HOST;
326 local_skb->dev = dev;
328 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
330 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
331 kfree_skb(local_skb);
335 dev->stats.rx_bytes += skb->len;
336 dev->stats.rx_packets++;
338 consume_skb(local_skb);
340 } else if (lowpan_is_iphc(*skb_network_header(skb))) {
341 local_skb = skb_clone(skb, GFP_ATOMIC);
345 local_skb->dev = dev;
347 ret = iphc_decompress(local_skb, dev, chan);
349 kfree_skb(local_skb);
353 local_skb->protocol = htons(ETH_P_IPV6);
354 local_skb->pkt_type = PACKET_HOST;
356 if (give_skb_to_upper(local_skb, dev)
358 kfree_skb(local_skb);
362 dev->stats.rx_bytes += skb->len;
363 dev->stats.rx_packets++;
365 consume_skb(local_skb);
371 return NET_RX_SUCCESS;
374 dev->stats.rx_dropped++;
378 /* Packet from BT LE device */
379 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
381 struct lowpan_btle_dev *dev;
382 struct lowpan_peer *peer;
385 peer = lookup_peer(chan->conn);
389 dev = lookup_dev(chan->conn);
390 if (!dev || !dev->netdev)
393 err = recv_pkt(skb, dev->netdev, chan);
395 BT_DBG("recv pkt %d", err);
402 static u8 get_addr_type_from_eui64(u8 byte)
404 /* Is universal(0) or local(1) bit */
405 return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
408 static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
410 u8 *eui64 = ip6_daddr->s6_addr + 8;
412 addr->b[0] = eui64[7];
413 addr->b[1] = eui64[6];
414 addr->b[2] = eui64[5];
415 addr->b[3] = eui64[2];
416 addr->b[4] = eui64[1];
417 addr->b[5] = eui64[0];
420 static void convert_dest_bdaddr(struct in6_addr *ip6_daddr,
421 bdaddr_t *addr, u8 *addr_type)
423 copy_to_bdaddr(ip6_daddr, addr);
425 /* We need to toggle the U/L bit that we got from IPv6 address
426 * so that we get the proper address and type of the BD address.
430 *addr_type = get_addr_type_from_eui64(addr->b[5]);
433 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
434 bdaddr_t *peer_addr, u8 *peer_addr_type)
436 struct in6_addr ipv6_daddr;
438 struct lowpan_btle_dev *dev;
439 struct lowpan_peer *peer;
440 bdaddr_t addr, *any = BDADDR_ANY;
446 dev = lowpan_btle_dev(netdev);
448 memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr));
450 if (ipv6_addr_is_multicast(&ipv6_daddr)) {
451 lowpan_cb(skb)->chan = NULL;
455 /* Get destination BT device from skb.
456 * If there is no such peer then discard the packet.
458 convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type);
460 BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
461 addr_type, &ipv6_daddr);
463 peer = peer_lookup_ba(dev, &addr, addr_type);
465 /* The packet might be sent to 6lowpan interface
466 * because of routing (either via default route
467 * or user set route) so get peer according to
468 * the destination address.
470 peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
472 BT_DBG("no such peer %pMR found", &addr);
477 daddr = peer->eui64_addr;
479 *peer_addr_type = addr_type;
480 lowpan_cb(skb)->chan = peer->chan;
485 lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr);
487 err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
494 static int header_create(struct sk_buff *skb, struct net_device *netdev,
495 unsigned short type, const void *_daddr,
496 const void *_saddr, unsigned int len)
498 if (type != ETH_P_IPV6)
504 /* Packet to BT LE device */
505 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
506 struct net_device *netdev)
512 /* Remember the skb so that we can send EAGAIN to the caller if
513 * we run out of credits.
517 iv.iov_base = skb->data;
518 iv.iov_len = skb->len;
520 memset(&msg, 0, sizeof(msg));
521 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len);
523 err = l2cap_chan_send(chan, &msg, skb->len);
525 netdev->stats.tx_bytes += err;
526 netdev->stats.tx_packets++;
531 err = lowpan_cb(skb)->status;
535 netdev->stats.tx_dropped++;
537 netdev->stats.tx_errors++;
543 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
545 struct sk_buff *local_skb;
546 struct lowpan_btle_dev *entry;
551 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
552 struct lowpan_peer *pentry;
553 struct lowpan_btle_dev *dev;
555 if (entry->netdev != netdev)
558 dev = lowpan_btle_dev(entry->netdev);
560 list_for_each_entry_rcu(pentry, &dev->peers, list) {
563 local_skb = skb_clone(skb, GFP_ATOMIC);
565 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
567 &pentry->chan->dst, pentry->chan->dst_type,
568 &pentry->peer_addr, pentry->chan);
569 ret = send_pkt(pentry->chan, local_skb, netdev);
573 kfree_skb(local_skb);
582 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
588 /* We must take a copy of the skb before we modify/replace the ipv6
589 * header as the header could be used elsewhere
591 skb = skb_unshare(skb, GFP_ATOMIC);
593 return NET_XMIT_DROP;
595 /* Return values from setup_header()
596 * <0 - error, packet is dropped
597 * 0 - this is a multicast packet
598 * 1 - this is unicast packet
600 err = setup_header(skb, netdev, &addr, &addr_type);
603 return NET_XMIT_DROP;
607 if (lowpan_cb(skb)->chan) {
608 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
609 netdev->name, &addr, addr_type,
610 &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
611 err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
616 /* We need to send the packet to every device behind this
619 err = send_mcast_pkt(skb, netdev);
625 BT_DBG("ERROR: xmit failed (%d)", err);
627 return err < 0 ? NET_XMIT_DROP : err;
630 static struct lock_class_key bt_tx_busylock;
631 static struct lock_class_key bt_netdev_xmit_lock_key;
632 static struct lock_class_key bt_qdisc_running_key;
634 static void bt_set_lockdep_class_one(struct net_device *dev,
635 struct netdev_queue *txq,
638 lockdep_set_class(&txq->_xmit_lock, &bt_netdev_xmit_lock_key);
641 static int bt_dev_init(struct net_device *dev)
643 netdev_for_each_tx_queue(dev, bt_set_lockdep_class_one, NULL);
644 dev->qdisc_tx_busylock = &bt_tx_busylock;
645 dev->qdisc_running_key = &bt_qdisc_running_key;
650 static const struct net_device_ops netdev_ops = {
651 .ndo_init = bt_dev_init,
652 .ndo_start_xmit = bt_xmit,
655 static struct header_ops header_ops = {
656 .create = header_create,
659 static void netdev_setup(struct net_device *dev)
661 dev->hard_header_len = 0;
662 dev->needed_tailroom = 0;
663 dev->flags = IFF_RUNNING | IFF_POINTOPOINT |
665 dev->watchdog_timeo = 0;
667 dev->netdev_ops = &netdev_ops;
668 dev->header_ops = &header_ops;
669 dev->destructor = free_netdev;
672 static struct device_type bt_type = {
676 static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
678 /* addr is the BT address in little-endian format */
688 /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
689 if (addr_type == BDADDR_LE_PUBLIC)
694 BT_DBG("type %d addr %*phC", addr_type, 8, eui);
697 static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr,
700 netdev->addr_assign_type = NET_ADDR_PERM;
701 set_addr(netdev->dev_addr, addr->b, addr_type);
704 static void ifup(struct net_device *netdev)
709 err = dev_open(netdev);
711 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
715 static void ifdown(struct net_device *netdev)
720 err = dev_close(netdev);
722 BT_INFO("iface %s cannot be closed (%d)", netdev->name, err);
726 static void do_notify_peers(struct work_struct *work)
728 struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev,
731 netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
734 static bool is_bt_6lowpan(struct hci_conn *hcon)
736 if (hcon->type != LE_LINK)
745 static struct l2cap_chan *chan_create(void)
747 struct l2cap_chan *chan;
749 chan = l2cap_chan_create();
753 l2cap_chan_set_defaults(chan);
755 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
756 chan->mode = L2CAP_MODE_LE_FLOWCTL;
762 static void set_ip_addr_bits(u8 addr_type, u8 *addr)
764 if (addr_type == BDADDR_LE_PUBLIC)
770 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
771 struct lowpan_btle_dev *dev)
773 struct lowpan_peer *peer;
775 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
780 memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
783 peer->peer_addr.s6_addr[0] = 0xFE;
784 peer->peer_addr.s6_addr[1] = 0x80;
785 set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b,
788 memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
791 /* IPv6 address needs to have the U/L bit set properly so toggle
794 set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8);
796 spin_lock(&devices_lock);
797 INIT_LIST_HEAD(&peer->list);
799 spin_unlock(&devices_lock);
801 /* Notifying peers about us needs to be done without locks held */
802 INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
803 schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
808 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
810 struct net_device *netdev;
813 netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
814 IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
819 set_dev_addr(netdev, &chan->src, chan->src_type);
821 netdev->netdev_ops = &netdev_ops;
822 SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
823 SET_NETDEV_DEVTYPE(netdev, &bt_type);
825 *dev = lowpan_btle_dev(netdev);
826 (*dev)->netdev = netdev;
827 (*dev)->hdev = chan->conn->hcon->hdev;
828 INIT_LIST_HEAD(&(*dev)->peers);
830 spin_lock(&devices_lock);
831 INIT_LIST_HEAD(&(*dev)->list);
832 list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
833 spin_unlock(&devices_lock);
835 err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE);
837 BT_INFO("register_netdev failed %d", err);
838 spin_lock(&devices_lock);
839 list_del_rcu(&(*dev)->list);
840 spin_unlock(&devices_lock);
845 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
846 netdev->ifindex, &chan->dst, chan->dst_type,
847 &chan->src, chan->src_type);
848 set_bit(__LINK_STATE_PRESENT, &netdev->state);
856 static inline void chan_ready_cb(struct l2cap_chan *chan)
858 struct lowpan_btle_dev *dev;
860 dev = lookup_dev(chan->conn);
862 BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
865 if (setup_netdev(chan, &dev) < 0) {
866 l2cap_chan_del(chan, -ENOENT);
871 if (!try_module_get(THIS_MODULE))
874 add_peer_chan(chan, dev);
878 static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
880 struct l2cap_chan *chan;
882 chan = chan_create();
886 chan->ops = pchan->ops;
888 BT_DBG("chan %p pchan %p", chan, pchan);
893 static void delete_netdev(struct work_struct *work)
895 struct lowpan_btle_dev *entry = container_of(work,
896 struct lowpan_btle_dev,
899 lowpan_unregister_netdev(entry->netdev);
901 /* The entry pointer is deleted by the netdev destructor. */
904 static void chan_close_cb(struct l2cap_chan *chan)
906 struct lowpan_btle_dev *entry;
907 struct lowpan_btle_dev *dev = NULL;
908 struct lowpan_peer *peer;
910 bool last = false, remove = true;
912 BT_DBG("chan %p conn %p", chan, chan->conn);
914 if (chan->conn && chan->conn->hcon) {
915 if (!is_bt_6lowpan(chan->conn->hcon))
918 /* If conn is set, then the netdev is also there and we should
924 spin_lock(&devices_lock);
926 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
927 dev = lowpan_btle_dev(entry->netdev);
928 peer = __peer_lookup_chan(dev, chan);
930 last = peer_del(dev, peer);
933 BT_DBG("dev %p removing %speer %p", dev,
934 last ? "last " : "1 ", peer);
935 BT_DBG("chan %p orig refcnt %d", chan,
936 atomic_read(&chan->kref.refcount));
938 l2cap_chan_put(chan);
943 if (!err && last && dev && !atomic_read(&dev->peer_count)) {
944 spin_unlock(&devices_lock);
946 cancel_delayed_work_sync(&dev->notify_peers);
951 INIT_WORK(&entry->delete_netdev, delete_netdev);
952 schedule_work(&entry->delete_netdev);
955 spin_unlock(&devices_lock);
961 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
963 BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
964 state_to_string(state), err);
967 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
968 unsigned long hdr_len,
969 unsigned long len, int nb)
971 /* Note that we must allocate using GFP_ATOMIC here as
972 * this function is called originally from netdev hard xmit
973 * function in atomic context.
975 return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
978 static void chan_suspend_cb(struct l2cap_chan *chan)
980 struct sk_buff *skb = chan->data;
982 BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
987 lowpan_cb(skb)->status = -EAGAIN;
990 static void chan_resume_cb(struct l2cap_chan *chan)
992 struct sk_buff *skb = chan->data;
994 BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
999 lowpan_cb(skb)->status = 0;
1002 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
1004 return L2CAP_CONN_TIMEOUT;
1007 static const struct l2cap_ops bt_6lowpan_chan_ops = {
1008 .name = "L2CAP 6LoWPAN channel",
1009 .new_connection = chan_new_conn_cb,
1010 .recv = chan_recv_cb,
1011 .close = chan_close_cb,
1012 .state_change = chan_state_change_cb,
1013 .ready = chan_ready_cb,
1014 .resume = chan_resume_cb,
1015 .suspend = chan_suspend_cb,
1016 .get_sndtimeo = chan_get_sndtimeo_cb,
1017 .alloc_skb = chan_alloc_skb_cb,
1019 .teardown = l2cap_chan_no_teardown,
1020 .defer = l2cap_chan_no_defer,
1021 .set_shutdown = l2cap_chan_no_set_shutdown,
1024 static inline __u8 bdaddr_type(__u8 type)
1026 if (type == ADDR_LE_DEV_PUBLIC)
1027 return BDADDR_LE_PUBLIC;
1029 return BDADDR_LE_RANDOM;
1032 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
1034 struct l2cap_chan *chan;
1037 chan = chan_create();
1041 chan->ops = &bt_6lowpan_chan_ops;
1043 err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
1046 BT_DBG("chan %p err %d", chan, err);
1048 l2cap_chan_put(chan);
1053 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
1055 struct lowpan_peer *peer;
1057 BT_DBG("conn %p dst type %d", conn, dst_type);
1059 peer = lookup_peer(conn);
1063 BT_DBG("peer %p chan %p", peer, peer->chan);
1065 l2cap_chan_close(peer->chan, ENOENT);
1070 static struct l2cap_chan *bt_6lowpan_listen(void)
1072 bdaddr_t *addr = BDADDR_ANY;
1073 struct l2cap_chan *chan;
1076 if (!enable_6lowpan)
1079 chan = chan_create();
1083 chan->ops = &bt_6lowpan_chan_ops;
1084 chan->state = BT_LISTEN;
1085 chan->src_type = BDADDR_LE_PUBLIC;
1087 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
1089 BT_DBG("chan %p src type %d", chan, chan->src_type);
1091 err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
1093 l2cap_chan_put(chan);
1094 BT_ERR("psm cannot be added err %d", err);
1101 static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
1102 struct l2cap_conn **conn)
1104 struct hci_conn *hcon;
1105 struct hci_dev *hdev;
1106 bdaddr_t *src = BDADDR_ANY;
1109 n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
1110 &addr->b[5], &addr->b[4], &addr->b[3],
1111 &addr->b[2], &addr->b[1], &addr->b[0],
1117 hdev = hci_get_route(addr, src);
1122 hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type);
1123 hci_dev_unlock(hdev);
1128 *conn = (struct l2cap_conn *)hcon->l2cap_data;
1130 BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1135 static void disconnect_all_peers(void)
1137 struct lowpan_btle_dev *entry;
1138 struct lowpan_peer *peer, *tmp_peer, *new_peer;
1139 struct list_head peers;
1141 INIT_LIST_HEAD(&peers);
1143 /* We make a separate list of peers as the close_cb() will
1144 * modify the device peers list so it is better not to mess
1145 * with the same list at the same time.
1150 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1151 list_for_each_entry_rcu(peer, &entry->peers, list) {
1152 new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1156 new_peer->chan = peer->chan;
1157 INIT_LIST_HEAD(&new_peer->list);
1159 list_add(&new_peer->list, &peers);
1165 spin_lock(&devices_lock);
1166 list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1167 l2cap_chan_close(peer->chan, ENOENT);
1169 list_del_rcu(&peer->list);
1170 kfree_rcu(peer, rcu);
1172 spin_unlock(&devices_lock);
1176 struct work_struct work;
1180 static void do_enable_set(struct work_struct *work)
1182 struct set_enable *set_enable = container_of(work,
1183 struct set_enable, work);
1185 if (!set_enable->flag || enable_6lowpan != set_enable->flag)
1186 /* Disconnect existing connections if 6lowpan is
1189 disconnect_all_peers();
1191 enable_6lowpan = set_enable->flag;
1194 l2cap_chan_close(listen_chan, 0);
1195 l2cap_chan_put(listen_chan);
1198 listen_chan = bt_6lowpan_listen();
1203 static int lowpan_enable_set(void *data, u64 val)
1205 struct set_enable *set_enable;
1207 set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
1211 set_enable->flag = !!val;
1212 INIT_WORK(&set_enable->work, do_enable_set);
1214 schedule_work(&set_enable->work);
1219 static int lowpan_enable_get(void *data, u64 *val)
1221 *val = enable_6lowpan;
1225 DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
1226 lowpan_enable_set, "%llu\n");
1228 static ssize_t lowpan_control_write(struct file *fp,
1229 const char __user *user_buffer,
1234 size_t buf_size = min(count, sizeof(buf) - 1);
1238 struct l2cap_conn *conn = NULL;
1240 if (copy_from_user(buf, user_buffer, buf_size))
1243 buf[buf_size] = '\0';
1245 if (memcmp(buf, "connect ", 8) == 0) {
1246 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1251 l2cap_chan_close(listen_chan, 0);
1252 l2cap_chan_put(listen_chan);
1257 struct lowpan_peer *peer;
1259 if (!is_bt_6lowpan(conn->hcon))
1262 peer = lookup_peer(conn);
1264 BT_DBG("6LoWPAN connection already exists");
1268 BT_DBG("conn %p dst %pMR type %d user %d", conn,
1269 &conn->hcon->dst, conn->hcon->dst_type,
1273 ret = bt_6lowpan_connect(&addr, addr_type);
1280 if (memcmp(buf, "disconnect ", 11) == 0) {
1281 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1285 ret = bt_6lowpan_disconnect(conn, addr_type);
1295 static int lowpan_control_show(struct seq_file *f, void *ptr)
1297 struct lowpan_btle_dev *entry;
1298 struct lowpan_peer *peer;
1300 spin_lock(&devices_lock);
1302 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1303 list_for_each_entry(peer, &entry->peers, list)
1304 seq_printf(f, "%pMR (type %u)\n",
1305 &peer->chan->dst, peer->chan->dst_type);
1308 spin_unlock(&devices_lock);
1313 static int lowpan_control_open(struct inode *inode, struct file *file)
1315 return single_open(file, lowpan_control_show, inode->i_private);
1318 static const struct file_operations lowpan_control_fops = {
1319 .open = lowpan_control_open,
1321 .write = lowpan_control_write,
1322 .llseek = seq_lseek,
1323 .release = single_release,
1326 static void disconnect_devices(void)
1328 struct lowpan_btle_dev *entry, *tmp, *new_dev;
1329 struct list_head devices;
1331 INIT_LIST_HEAD(&devices);
1333 /* We make a separate list of devices because the unregister_netdev()
1334 * will call device_event() which will also want to modify the same
1340 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1341 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1345 new_dev->netdev = entry->netdev;
1346 INIT_LIST_HEAD(&new_dev->list);
1348 list_add_rcu(&new_dev->list, &devices);
1353 list_for_each_entry_safe(entry, tmp, &devices, list) {
1354 ifdown(entry->netdev);
1355 BT_DBG("Unregistering netdev %s %p",
1356 entry->netdev->name, entry->netdev);
1357 lowpan_unregister_netdev(entry->netdev);
1362 static int device_event(struct notifier_block *unused,
1363 unsigned long event, void *ptr)
1365 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1366 struct lowpan_btle_dev *entry;
1368 if (netdev->type != ARPHRD_6LOWPAN)
1372 case NETDEV_UNREGISTER:
1373 spin_lock(&devices_lock);
1374 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1375 if (entry->netdev == netdev) {
1376 BT_DBG("Unregistered netdev %s %p",
1377 netdev->name, netdev);
1378 list_del(&entry->list);
1382 spin_unlock(&devices_lock);
1389 static struct notifier_block bt_6lowpan_dev_notifier = {
1390 .notifier_call = device_event,
1393 static int __init bt_6lowpan_init(void)
1395 lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644,
1397 &lowpan_enable_fops);
1398 lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1400 &lowpan_control_fops);
1402 return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1405 static void __exit bt_6lowpan_exit(void)
1407 debugfs_remove(lowpan_enable_debugfs);
1408 debugfs_remove(lowpan_control_debugfs);
1411 l2cap_chan_close(listen_chan, 0);
1412 l2cap_chan_put(listen_chan);
1415 disconnect_devices();
1417 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1420 module_init(bt_6lowpan_init);
1421 module_exit(bt_6lowpan_exit);
1423 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1424 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1425 MODULE_VERSION(VERSION);
1426 MODULE_LICENSE("GPL");