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>
23 #include <net/pkt_sched.h>
25 #include <net/bluetooth/bluetooth.h>
26 #include <net/bluetooth/hci_core.h>
27 #include <net/bluetooth/l2cap.h>
29 #include <net/6lowpan.h> /* for the compression support */
33 static struct dentry
*lowpan_enable_debugfs
;
34 static struct dentry
*lowpan_control_debugfs
;
36 #define IFACE_NAME_TEMPLATE "bt%d"
41 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 lladdr
[ETH_ALEN
];
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 lowpan_peer
*peer
)
276 struct lowpan_btle_dev
*dev
;
278 dev
= lowpan_btle_dev(netdev
);
280 saddr
= peer
->lladdr
;
282 return lowpan_header_decompress(skb
, netdev
, netdev
->dev_addr
, saddr
);
285 static int recv_pkt(struct sk_buff
*skb
, struct net_device
*dev
,
286 struct lowpan_peer
*peer
)
288 struct sk_buff
*local_skb
;
291 if (!netif_running(dev
))
294 if (dev
->type
!= ARPHRD_6LOWPAN
|| !skb
->len
)
297 skb_reset_network_header(skb
);
299 skb
= skb_share_check(skb
, GFP_ATOMIC
);
303 /* check that it's our buffer */
304 if (lowpan_is_ipv6(*skb_network_header(skb
))) {
305 /* Pull off the 1-byte of 6lowpan header. */
308 /* Copy the packet so that the IPv6 header is
311 local_skb
= skb_copy_expand(skb
, NET_SKB_PAD
- 1,
312 skb_tailroom(skb
), GFP_ATOMIC
);
316 local_skb
->protocol
= htons(ETH_P_IPV6
);
317 local_skb
->pkt_type
= PACKET_HOST
;
318 local_skb
->dev
= dev
;
320 skb_set_transport_header(local_skb
, sizeof(struct ipv6hdr
));
322 if (give_skb_to_upper(local_skb
, dev
) != NET_RX_SUCCESS
) {
323 kfree_skb(local_skb
);
327 dev
->stats
.rx_bytes
+= skb
->len
;
328 dev
->stats
.rx_packets
++;
330 consume_skb(local_skb
);
332 } else if (lowpan_is_iphc(*skb_network_header(skb
))) {
333 local_skb
= skb_clone(skb
, GFP_ATOMIC
);
337 local_skb
->dev
= dev
;
339 ret
= iphc_decompress(local_skb
, dev
, peer
);
341 BT_DBG("iphc_decompress failed: %d", ret
);
342 kfree_skb(local_skb
);
346 local_skb
->protocol
= htons(ETH_P_IPV6
);
347 local_skb
->pkt_type
= PACKET_HOST
;
349 if (give_skb_to_upper(local_skb
, dev
)
351 kfree_skb(local_skb
);
355 dev
->stats
.rx_bytes
+= skb
->len
;
356 dev
->stats
.rx_packets
++;
358 consume_skb(local_skb
);
361 BT_DBG("unknown packet type");
365 return NET_RX_SUCCESS
;
368 dev
->stats
.rx_dropped
++;
372 /* Packet from BT LE device */
373 static int chan_recv_cb(struct l2cap_chan
*chan
, struct sk_buff
*skb
)
375 struct lowpan_btle_dev
*dev
;
376 struct lowpan_peer
*peer
;
379 peer
= lookup_peer(chan
->conn
);
383 dev
= lookup_dev(chan
->conn
);
384 if (!dev
|| !dev
->netdev
)
387 err
= recv_pkt(skb
, dev
->netdev
, peer
);
389 BT_DBG("recv pkt %d", err
);
396 static int setup_header(struct sk_buff
*skb
, struct net_device
*netdev
,
397 bdaddr_t
*peer_addr
, u8
*peer_addr_type
)
399 struct in6_addr ipv6_daddr
;
401 struct lowpan_btle_dev
*dev
;
402 struct lowpan_peer
*peer
;
408 dev
= lowpan_btle_dev(netdev
);
410 memcpy(&ipv6_daddr
, &hdr
->daddr
, sizeof(ipv6_daddr
));
412 if (ipv6_addr_is_multicast(&ipv6_daddr
)) {
413 lowpan_cb(skb
)->chan
= NULL
;
416 BT_DBG("dest IP %pI6c", &ipv6_daddr
);
418 /* The packet might be sent to 6lowpan interface
419 * because of routing (either via default route
420 * or user set route) so get peer according to
421 * the destination address.
423 peer
= peer_lookup_dst(dev
, &ipv6_daddr
, skb
);
425 BT_DBG("no such peer");
429 daddr
= peer
->lladdr
;
430 *peer_addr
= peer
->chan
->dst
;
431 *peer_addr_type
= peer
->chan
->dst_type
;
432 lowpan_cb(skb
)->chan
= peer
->chan
;
437 lowpan_header_compress(skb
, netdev
, daddr
, dev
->netdev
->dev_addr
);
439 err
= dev_hard_header(skb
, netdev
, ETH_P_IPV6
, NULL
, NULL
, 0);
446 static int header_create(struct sk_buff
*skb
, struct net_device
*netdev
,
447 unsigned short type
, const void *_daddr
,
448 const void *_saddr
, unsigned int len
)
450 if (type
!= ETH_P_IPV6
)
456 /* Packet to BT LE device */
457 static int send_pkt(struct l2cap_chan
*chan
, struct sk_buff
*skb
,
458 struct net_device
*netdev
)
464 /* Remember the skb so that we can send EAGAIN to the caller if
465 * we run out of credits.
469 iv
.iov_base
= skb
->data
;
470 iv
.iov_len
= skb
->len
;
472 memset(&msg
, 0, sizeof(msg
));
473 iov_iter_kvec(&msg
.msg_iter
, WRITE
| ITER_KVEC
, &iv
, 1, skb
->len
);
475 err
= l2cap_chan_send(chan
, &msg
, skb
->len
);
477 netdev
->stats
.tx_bytes
+= err
;
478 netdev
->stats
.tx_packets
++;
483 netdev
->stats
.tx_errors
++;
488 static int send_mcast_pkt(struct sk_buff
*skb
, struct net_device
*netdev
)
490 struct sk_buff
*local_skb
;
491 struct lowpan_btle_dev
*entry
;
496 list_for_each_entry_rcu(entry
, &bt_6lowpan_devices
, list
) {
497 struct lowpan_peer
*pentry
;
498 struct lowpan_btle_dev
*dev
;
500 if (entry
->netdev
!= netdev
)
503 dev
= lowpan_btle_dev(entry
->netdev
);
505 list_for_each_entry_rcu(pentry
, &dev
->peers
, list
) {
508 local_skb
= skb_clone(skb
, GFP_ATOMIC
);
510 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
512 &pentry
->chan
->dst
, pentry
->chan
->dst_type
,
513 &pentry
->peer_addr
, pentry
->chan
);
514 ret
= send_pkt(pentry
->chan
, local_skb
, netdev
);
518 kfree_skb(local_skb
);
527 static netdev_tx_t
bt_xmit(struct sk_buff
*skb
, struct net_device
*netdev
)
533 /* We must take a copy of the skb before we modify/replace the ipv6
534 * header as the header could be used elsewhere
536 skb
= skb_unshare(skb
, GFP_ATOMIC
);
538 return NET_XMIT_DROP
;
540 /* Return values from setup_header()
541 * <0 - error, packet is dropped
542 * 0 - this is a multicast packet
543 * 1 - this is unicast packet
545 err
= setup_header(skb
, netdev
, &addr
, &addr_type
);
548 return NET_XMIT_DROP
;
552 if (lowpan_cb(skb
)->chan
) {
553 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
554 netdev
->name
, &addr
, addr_type
,
555 &lowpan_cb(skb
)->addr
, lowpan_cb(skb
)->chan
);
556 err
= send_pkt(lowpan_cb(skb
)->chan
, skb
, netdev
);
561 /* We need to send the packet to every device behind this
564 err
= send_mcast_pkt(skb
, netdev
);
570 BT_DBG("ERROR: xmit failed (%d)", err
);
572 return err
< 0 ? NET_XMIT_DROP
: err
;
575 static int bt_dev_init(struct net_device
*dev
)
577 netdev_lockdep_set_classes(dev
);
582 static const struct net_device_ops netdev_ops
= {
583 .ndo_init
= bt_dev_init
,
584 .ndo_start_xmit
= bt_xmit
,
587 static struct header_ops header_ops
= {
588 .create
= header_create
,
591 static void netdev_setup(struct net_device
*dev
)
593 dev
->hard_header_len
= 0;
594 dev
->needed_tailroom
= 0;
595 dev
->flags
= IFF_RUNNING
| IFF_MULTICAST
;
596 dev
->watchdog_timeo
= 0;
597 dev
->tx_queue_len
= DEFAULT_TX_QUEUE_LEN
;
599 dev
->netdev_ops
= &netdev_ops
;
600 dev
->header_ops
= &header_ops
;
601 dev
->needs_free_netdev
= true;
604 static struct device_type bt_type
= {
608 static void ifup(struct net_device
*netdev
)
613 err
= dev_open(netdev
);
615 BT_INFO("iface %s cannot be opened (%d)", netdev
->name
, err
);
619 static void ifdown(struct net_device
*netdev
)
624 err
= dev_close(netdev
);
626 BT_INFO("iface %s cannot be closed (%d)", netdev
->name
, err
);
630 static void do_notify_peers(struct work_struct
*work
)
632 struct lowpan_btle_dev
*dev
= container_of(work
, struct lowpan_btle_dev
,
635 netdev_notify_peers(dev
->netdev
); /* send neighbour adv at startup */
638 static bool is_bt_6lowpan(struct hci_conn
*hcon
)
640 if (hcon
->type
!= LE_LINK
)
649 static struct l2cap_chan
*chan_create(void)
651 struct l2cap_chan
*chan
;
653 chan
= l2cap_chan_create();
657 l2cap_chan_set_defaults(chan
);
659 chan
->chan_type
= L2CAP_CHAN_CONN_ORIENTED
;
660 chan
->mode
= L2CAP_MODE_LE_FLOWCTL
;
666 static struct l2cap_chan
*add_peer_chan(struct l2cap_chan
*chan
,
667 struct lowpan_btle_dev
*dev
,
670 struct lowpan_peer
*peer
;
672 peer
= kzalloc(sizeof(*peer
), GFP_ATOMIC
);
677 memset(&peer
->peer_addr
, 0, sizeof(struct in6_addr
));
679 baswap((void *)peer
->lladdr
, &chan
->dst
);
681 lowpan_iphc_uncompress_eui48_lladdr(&peer
->peer_addr
, peer
->lladdr
);
683 spin_lock(&devices_lock
);
684 INIT_LIST_HEAD(&peer
->list
);
686 spin_unlock(&devices_lock
);
688 /* Notifying peers about us needs to be done without locks held */
690 INIT_DELAYED_WORK(&dev
->notify_peers
, do_notify_peers
);
691 schedule_delayed_work(&dev
->notify_peers
, msecs_to_jiffies(100));
696 static int setup_netdev(struct l2cap_chan
*chan
, struct lowpan_btle_dev
**dev
)
698 struct net_device
*netdev
;
701 netdev
= alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev
)),
702 IFACE_NAME_TEMPLATE
, NET_NAME_UNKNOWN
,
707 netdev
->addr_assign_type
= NET_ADDR_PERM
;
708 baswap((void *)netdev
->dev_addr
, &chan
->src
);
710 netdev
->netdev_ops
= &netdev_ops
;
711 SET_NETDEV_DEV(netdev
, &chan
->conn
->hcon
->hdev
->dev
);
712 SET_NETDEV_DEVTYPE(netdev
, &bt_type
);
714 *dev
= lowpan_btle_dev(netdev
);
715 (*dev
)->netdev
= netdev
;
716 (*dev
)->hdev
= chan
->conn
->hcon
->hdev
;
717 INIT_LIST_HEAD(&(*dev
)->peers
);
719 spin_lock(&devices_lock
);
720 INIT_LIST_HEAD(&(*dev
)->list
);
721 list_add_rcu(&(*dev
)->list
, &bt_6lowpan_devices
);
722 spin_unlock(&devices_lock
);
724 err
= lowpan_register_netdev(netdev
, LOWPAN_LLTYPE_BTLE
);
726 BT_INFO("register_netdev failed %d", err
);
727 spin_lock(&devices_lock
);
728 list_del_rcu(&(*dev
)->list
);
729 spin_unlock(&devices_lock
);
734 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
735 netdev
->ifindex
, &chan
->dst
, chan
->dst_type
,
736 &chan
->src
, chan
->src_type
);
737 set_bit(__LINK_STATE_PRESENT
, &netdev
->state
);
745 static inline void chan_ready_cb(struct l2cap_chan
*chan
)
747 struct lowpan_btle_dev
*dev
;
748 bool new_netdev
= false;
750 dev
= lookup_dev(chan
->conn
);
752 BT_DBG("chan %p conn %p dev %p", chan
, chan
->conn
, dev
);
755 if (setup_netdev(chan
, &dev
) < 0) {
756 l2cap_chan_del(chan
, -ENOENT
);
762 if (!try_module_get(THIS_MODULE
))
765 add_peer_chan(chan
, dev
, new_netdev
);
769 static inline struct l2cap_chan
*chan_new_conn_cb(struct l2cap_chan
*pchan
)
771 struct l2cap_chan
*chan
;
773 chan
= chan_create();
777 chan
->ops
= pchan
->ops
;
779 BT_DBG("chan %p pchan %p", chan
, pchan
);
784 static void delete_netdev(struct work_struct
*work
)
786 struct lowpan_btle_dev
*entry
= container_of(work
,
787 struct lowpan_btle_dev
,
790 lowpan_unregister_netdev(entry
->netdev
);
792 /* The entry pointer is deleted by the netdev destructor. */
795 static void chan_close_cb(struct l2cap_chan
*chan
)
797 struct lowpan_btle_dev
*entry
;
798 struct lowpan_btle_dev
*dev
= NULL
;
799 struct lowpan_peer
*peer
;
801 bool last
= false, remove
= true;
803 BT_DBG("chan %p conn %p", chan
, chan
->conn
);
805 if (chan
->conn
&& chan
->conn
->hcon
) {
806 if (!is_bt_6lowpan(chan
->conn
->hcon
))
809 /* If conn is set, then the netdev is also there and we should
815 spin_lock(&devices_lock
);
817 list_for_each_entry_rcu(entry
, &bt_6lowpan_devices
, list
) {
818 dev
= lowpan_btle_dev(entry
->netdev
);
819 peer
= __peer_lookup_chan(dev
, chan
);
821 last
= peer_del(dev
, peer
);
824 BT_DBG("dev %p removing %speer %p", dev
,
825 last
? "last " : "1 ", peer
);
826 BT_DBG("chan %p orig refcnt %d", chan
,
827 kref_read(&chan
->kref
));
829 l2cap_chan_put(chan
);
834 if (!err
&& last
&& dev
&& !atomic_read(&dev
->peer_count
)) {
835 spin_unlock(&devices_lock
);
837 cancel_delayed_work_sync(&dev
->notify_peers
);
842 INIT_WORK(&entry
->delete_netdev
, delete_netdev
);
843 schedule_work(&entry
->delete_netdev
);
846 spin_unlock(&devices_lock
);
852 static void chan_state_change_cb(struct l2cap_chan
*chan
, int state
, int err
)
854 BT_DBG("chan %p conn %p state %s err %d", chan
, chan
->conn
,
855 state_to_string(state
), err
);
858 static struct sk_buff
*chan_alloc_skb_cb(struct l2cap_chan
*chan
,
859 unsigned long hdr_len
,
860 unsigned long len
, int nb
)
862 /* Note that we must allocate using GFP_ATOMIC here as
863 * this function is called originally from netdev hard xmit
864 * function in atomic context.
866 return bt_skb_alloc(hdr_len
+ len
, GFP_ATOMIC
);
869 static void chan_suspend_cb(struct l2cap_chan
*chan
)
871 struct lowpan_btle_dev
*dev
;
873 BT_DBG("chan %p suspend", chan
);
875 dev
= lookup_dev(chan
->conn
);
876 if (!dev
|| !dev
->netdev
)
879 netif_stop_queue(dev
->netdev
);
882 static void chan_resume_cb(struct l2cap_chan
*chan
)
884 struct lowpan_btle_dev
*dev
;
886 BT_DBG("chan %p resume", chan
);
888 dev
= lookup_dev(chan
->conn
);
889 if (!dev
|| !dev
->netdev
)
892 netif_wake_queue(dev
->netdev
);
895 static long chan_get_sndtimeo_cb(struct l2cap_chan
*chan
)
897 return L2CAP_CONN_TIMEOUT
;
900 static const struct l2cap_ops bt_6lowpan_chan_ops
= {
901 .name
= "L2CAP 6LoWPAN channel",
902 .new_connection
= chan_new_conn_cb
,
903 .recv
= chan_recv_cb
,
904 .close
= chan_close_cb
,
905 .state_change
= chan_state_change_cb
,
906 .ready
= chan_ready_cb
,
907 .resume
= chan_resume_cb
,
908 .suspend
= chan_suspend_cb
,
909 .get_sndtimeo
= chan_get_sndtimeo_cb
,
910 .alloc_skb
= chan_alloc_skb_cb
,
912 .teardown
= l2cap_chan_no_teardown
,
913 .defer
= l2cap_chan_no_defer
,
914 .set_shutdown
= l2cap_chan_no_set_shutdown
,
917 static inline __u8
bdaddr_type(__u8 type
)
919 if (type
== ADDR_LE_DEV_PUBLIC
)
920 return BDADDR_LE_PUBLIC
;
922 return BDADDR_LE_RANDOM
;
925 static int bt_6lowpan_connect(bdaddr_t
*addr
, u8 dst_type
)
927 struct l2cap_chan
*chan
;
930 chan
= chan_create();
934 chan
->ops
= &bt_6lowpan_chan_ops
;
936 err
= l2cap_chan_connect(chan
, cpu_to_le16(L2CAP_PSM_IPSP
), 0,
939 BT_DBG("chan %p err %d", chan
, err
);
941 l2cap_chan_put(chan
);
946 static int bt_6lowpan_disconnect(struct l2cap_conn
*conn
, u8 dst_type
)
948 struct lowpan_peer
*peer
;
950 BT_DBG("conn %p dst type %d", conn
, dst_type
);
952 peer
= lookup_peer(conn
);
956 BT_DBG("peer %p chan %p", peer
, peer
->chan
);
958 l2cap_chan_close(peer
->chan
, ENOENT
);
963 static struct l2cap_chan
*bt_6lowpan_listen(void)
965 bdaddr_t
*addr
= BDADDR_ANY
;
966 struct l2cap_chan
*chan
;
972 chan
= chan_create();
976 chan
->ops
= &bt_6lowpan_chan_ops
;
977 chan
->state
= BT_LISTEN
;
978 chan
->src_type
= BDADDR_LE_PUBLIC
;
980 atomic_set(&chan
->nesting
, L2CAP_NESTING_PARENT
);
982 BT_DBG("chan %p src type %d", chan
, chan
->src_type
);
984 err
= l2cap_add_psm(chan
, addr
, cpu_to_le16(L2CAP_PSM_IPSP
));
986 l2cap_chan_put(chan
);
987 BT_ERR("psm cannot be added err %d", err
);
994 static int get_l2cap_conn(char *buf
, bdaddr_t
*addr
, u8
*addr_type
,
995 struct l2cap_conn
**conn
)
997 struct hci_conn
*hcon
;
998 struct hci_dev
*hdev
;
1001 n
= sscanf(buf
, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
1002 &addr
->b
[5], &addr
->b
[4], &addr
->b
[3],
1003 &addr
->b
[2], &addr
->b
[1], &addr
->b
[0],
1009 /* The LE_PUBLIC address type is ignored because of BDADDR_ANY */
1010 hdev
= hci_get_route(addr
, BDADDR_ANY
, BDADDR_LE_PUBLIC
);
1015 hcon
= hci_conn_hash_lookup_le(hdev
, addr
, *addr_type
);
1016 hci_dev_unlock(hdev
);
1021 *conn
= (struct l2cap_conn
*)hcon
->l2cap_data
;
1023 BT_DBG("conn %p dst %pMR type %d", *conn
, &hcon
->dst
, hcon
->dst_type
);
1028 static void disconnect_all_peers(void)
1030 struct lowpan_btle_dev
*entry
;
1031 struct lowpan_peer
*peer
, *tmp_peer
, *new_peer
;
1032 struct list_head peers
;
1034 INIT_LIST_HEAD(&peers
);
1036 /* We make a separate list of peers as the close_cb() will
1037 * modify the device peers list so it is better not to mess
1038 * with the same list at the same time.
1043 list_for_each_entry_rcu(entry
, &bt_6lowpan_devices
, list
) {
1044 list_for_each_entry_rcu(peer
, &entry
->peers
, list
) {
1045 new_peer
= kmalloc(sizeof(*new_peer
), GFP_ATOMIC
);
1049 new_peer
->chan
= peer
->chan
;
1050 INIT_LIST_HEAD(&new_peer
->list
);
1052 list_add(&new_peer
->list
, &peers
);
1058 spin_lock(&devices_lock
);
1059 list_for_each_entry_safe(peer
, tmp_peer
, &peers
, list
) {
1060 l2cap_chan_close(peer
->chan
, ENOENT
);
1062 list_del_rcu(&peer
->list
);
1063 kfree_rcu(peer
, rcu
);
1065 spin_unlock(&devices_lock
);
1069 struct work_struct work
;
1073 static void do_enable_set(struct work_struct
*work
)
1075 struct set_enable
*set_enable
= container_of(work
,
1076 struct set_enable
, work
);
1078 if (!set_enable
->flag
|| enable_6lowpan
!= set_enable
->flag
)
1079 /* Disconnect existing connections if 6lowpan is
1082 disconnect_all_peers();
1084 enable_6lowpan
= set_enable
->flag
;
1087 l2cap_chan_close(listen_chan
, 0);
1088 l2cap_chan_put(listen_chan
);
1091 listen_chan
= bt_6lowpan_listen();
1096 static int lowpan_enable_set(void *data
, u64 val
)
1098 struct set_enable
*set_enable
;
1100 set_enable
= kzalloc(sizeof(*set_enable
), GFP_KERNEL
);
1104 set_enable
->flag
= !!val
;
1105 INIT_WORK(&set_enable
->work
, do_enable_set
);
1107 schedule_work(&set_enable
->work
);
1112 static int lowpan_enable_get(void *data
, u64
*val
)
1114 *val
= enable_6lowpan
;
1118 DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops
, lowpan_enable_get
,
1119 lowpan_enable_set
, "%llu\n");
1121 static ssize_t
lowpan_control_write(struct file
*fp
,
1122 const char __user
*user_buffer
,
1127 size_t buf_size
= min(count
, sizeof(buf
) - 1);
1131 struct l2cap_conn
*conn
= NULL
;
1133 if (copy_from_user(buf
, user_buffer
, buf_size
))
1136 buf
[buf_size
] = '\0';
1138 if (memcmp(buf
, "connect ", 8) == 0) {
1139 ret
= get_l2cap_conn(&buf
[8], &addr
, &addr_type
, &conn
);
1144 l2cap_chan_close(listen_chan
, 0);
1145 l2cap_chan_put(listen_chan
);
1150 struct lowpan_peer
*peer
;
1152 if (!is_bt_6lowpan(conn
->hcon
))
1155 peer
= lookup_peer(conn
);
1157 BT_DBG("6LoWPAN connection already exists");
1161 BT_DBG("conn %p dst %pMR type %d user %d", conn
,
1162 &conn
->hcon
->dst
, conn
->hcon
->dst_type
,
1166 ret
= bt_6lowpan_connect(&addr
, addr_type
);
1173 if (memcmp(buf
, "disconnect ", 11) == 0) {
1174 ret
= get_l2cap_conn(&buf
[11], &addr
, &addr_type
, &conn
);
1178 ret
= bt_6lowpan_disconnect(conn
, addr_type
);
1188 static int lowpan_control_show(struct seq_file
*f
, void *ptr
)
1190 struct lowpan_btle_dev
*entry
;
1191 struct lowpan_peer
*peer
;
1193 spin_lock(&devices_lock
);
1195 list_for_each_entry(entry
, &bt_6lowpan_devices
, list
) {
1196 list_for_each_entry(peer
, &entry
->peers
, list
)
1197 seq_printf(f
, "%pMR (type %u)\n",
1198 &peer
->chan
->dst
, peer
->chan
->dst_type
);
1201 spin_unlock(&devices_lock
);
1206 static int lowpan_control_open(struct inode
*inode
, struct file
*file
)
1208 return single_open(file
, lowpan_control_show
, inode
->i_private
);
1211 static const struct file_operations lowpan_control_fops
= {
1212 .open
= lowpan_control_open
,
1214 .write
= lowpan_control_write
,
1215 .llseek
= seq_lseek
,
1216 .release
= single_release
,
1219 static void disconnect_devices(void)
1221 struct lowpan_btle_dev
*entry
, *tmp
, *new_dev
;
1222 struct list_head devices
;
1224 INIT_LIST_HEAD(&devices
);
1226 /* We make a separate list of devices because the unregister_netdev()
1227 * will call device_event() which will also want to modify the same
1233 list_for_each_entry_rcu(entry
, &bt_6lowpan_devices
, list
) {
1234 new_dev
= kmalloc(sizeof(*new_dev
), GFP_ATOMIC
);
1238 new_dev
->netdev
= entry
->netdev
;
1239 INIT_LIST_HEAD(&new_dev
->list
);
1241 list_add_rcu(&new_dev
->list
, &devices
);
1246 list_for_each_entry_safe(entry
, tmp
, &devices
, list
) {
1247 ifdown(entry
->netdev
);
1248 BT_DBG("Unregistering netdev %s %p",
1249 entry
->netdev
->name
, entry
->netdev
);
1250 lowpan_unregister_netdev(entry
->netdev
);
1255 static int device_event(struct notifier_block
*unused
,
1256 unsigned long event
, void *ptr
)
1258 struct net_device
*netdev
= netdev_notifier_info_to_dev(ptr
);
1259 struct lowpan_btle_dev
*entry
;
1261 if (netdev
->type
!= ARPHRD_6LOWPAN
)
1265 case NETDEV_UNREGISTER
:
1266 spin_lock(&devices_lock
);
1267 list_for_each_entry(entry
, &bt_6lowpan_devices
, list
) {
1268 if (entry
->netdev
== netdev
) {
1269 BT_DBG("Unregistered netdev %s %p",
1270 netdev
->name
, netdev
);
1271 list_del(&entry
->list
);
1275 spin_unlock(&devices_lock
);
1282 static struct notifier_block bt_6lowpan_dev_notifier
= {
1283 .notifier_call
= device_event
,
1286 static int __init
bt_6lowpan_init(void)
1288 lowpan_enable_debugfs
= debugfs_create_file("6lowpan_enable", 0644,
1290 &lowpan_enable_fops
);
1291 lowpan_control_debugfs
= debugfs_create_file("6lowpan_control", 0644,
1293 &lowpan_control_fops
);
1295 return register_netdevice_notifier(&bt_6lowpan_dev_notifier
);
1298 static void __exit
bt_6lowpan_exit(void)
1300 debugfs_remove(lowpan_enable_debugfs
);
1301 debugfs_remove(lowpan_control_debugfs
);
1304 l2cap_chan_close(listen_chan
, 0);
1305 l2cap_chan_put(listen_chan
);
1308 disconnect_devices();
1310 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier
);
1313 module_init(bt_6lowpan_init
);
1314 module_exit(bt_6lowpan_exit
);
1316 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1317 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1318 MODULE_VERSION(VERSION
);
1319 MODULE_LICENSE("GPL");