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
;
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_dev
*lowpan_dev(const struct net_device
*netdev
)
85 return (struct lowpan_dev
*)lowpan_priv(netdev
)->priv
;
88 static inline void peer_add(struct lowpan_dev
*dev
, struct lowpan_peer
*peer
)
90 list_add_rcu(&peer
->list
, &dev
->peers
);
91 atomic_inc(&dev
->peer_count
);
94 static inline bool peer_del(struct lowpan_dev
*dev
, struct lowpan_peer
*peer
)
96 list_del_rcu(&peer
->list
);
99 module_put(THIS_MODULE
);
101 if (atomic_dec_and_test(&dev
->peer_count
)) {
109 static inline struct lowpan_peer
*peer_lookup_ba(struct lowpan_dev
*dev
,
110 bdaddr_t
*ba
, __u8 type
)
112 struct lowpan_peer
*peer
;
114 BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev
->peer_count
),
119 list_for_each_entry_rcu(peer
, &dev
->peers
, list
) {
120 BT_DBG("dst addr %pMR dst type %d",
121 &peer
->chan
->dst
, peer
->chan
->dst_type
);
123 if (bacmp(&peer
->chan
->dst
, ba
))
126 if (type
== peer
->chan
->dst_type
) {
137 static inline struct lowpan_peer
*__peer_lookup_chan(struct lowpan_dev
*dev
,
138 struct l2cap_chan
*chan
)
140 struct lowpan_peer
*peer
;
142 list_for_each_entry_rcu(peer
, &dev
->peers
, list
) {
143 if (peer
->chan
== chan
)
150 static inline struct lowpan_peer
*__peer_lookup_conn(struct lowpan_dev
*dev
,
151 struct l2cap_conn
*conn
)
153 struct lowpan_peer
*peer
;
155 list_for_each_entry_rcu(peer
, &dev
->peers
, list
) {
156 if (peer
->chan
->conn
== conn
)
163 static inline struct lowpan_peer
*peer_lookup_dst(struct lowpan_dev
*dev
,
164 struct in6_addr
*daddr
,
167 struct lowpan_peer
*peer
;
168 struct in6_addr
*nexthop
;
169 struct rt6_info
*rt
= (struct rt6_info
*)skb_dst(skb
);
170 int count
= atomic_read(&dev
->peer_count
);
172 BT_DBG("peers %d addr %pI6c rt %p", count
, daddr
, rt
);
174 /* If we have multiple 6lowpan peers, then check where we should
175 * send the packet. If only one peer exists, then we can send the
180 peer
= list_first_or_null_rcu(&dev
->peers
, struct lowpan_peer
,
187 nexthop
= &lowpan_cb(skb
)->gw
;
189 if (ipv6_addr_any(nexthop
))
192 nexthop
= rt6_nexthop(rt
, daddr
);
194 /* We need to remember the address because it is needed
195 * by bt_xmit() when sending the packet. In bt_xmit(), the
196 * destination routing info is not set.
198 memcpy(&lowpan_cb(skb
)->gw
, nexthop
, sizeof(struct in6_addr
));
201 BT_DBG("gw %pI6c", nexthop
);
205 list_for_each_entry_rcu(peer
, &dev
->peers
, list
) {
206 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
207 &peer
->chan
->dst
, peer
->chan
->dst_type
,
210 if (!ipv6_addr_cmp(&peer
->peer_addr
, nexthop
)) {
221 static struct lowpan_peer
*lookup_peer(struct l2cap_conn
*conn
)
223 struct lowpan_dev
*entry
;
224 struct lowpan_peer
*peer
= NULL
;
228 list_for_each_entry_rcu(entry
, &bt_6lowpan_devices
, list
) {
229 peer
= __peer_lookup_conn(entry
, conn
);
239 static struct lowpan_dev
*lookup_dev(struct l2cap_conn
*conn
)
241 struct lowpan_dev
*entry
;
242 struct lowpan_dev
*dev
= NULL
;
246 list_for_each_entry_rcu(entry
, &bt_6lowpan_devices
, list
) {
247 if (conn
->hcon
->hdev
== entry
->hdev
) {
258 static int give_skb_to_upper(struct sk_buff
*skb
, struct net_device
*dev
)
260 struct sk_buff
*skb_cp
;
262 skb_cp
= skb_copy(skb
, GFP_ATOMIC
);
266 return netif_rx_ni(skb_cp
);
269 static int iphc_decompress(struct sk_buff
*skb
, struct net_device
*netdev
,
270 struct l2cap_chan
*chan
)
272 const u8
*saddr
, *daddr
;
273 struct lowpan_dev
*dev
;
274 struct lowpan_peer
*peer
;
276 dev
= lowpan_dev(netdev
);
279 peer
= __peer_lookup_chan(dev
, chan
);
284 saddr
= peer
->eui64_addr
;
285 daddr
= dev
->netdev
->dev_addr
;
287 return lowpan_header_decompress(skb
, netdev
, daddr
, saddr
);
290 static int recv_pkt(struct sk_buff
*skb
, struct net_device
*dev
,
291 struct l2cap_chan
*chan
)
293 struct sk_buff
*local_skb
;
296 if (!netif_running(dev
))
299 if (dev
->type
!= ARPHRD_6LOWPAN
|| !skb
->len
)
302 skb_reset_network_header(skb
);
304 skb
= skb_share_check(skb
, GFP_ATOMIC
);
308 /* check that it's our buffer */
309 if (lowpan_is_ipv6(*skb_network_header(skb
))) {
310 /* Pull off the 1-byte of 6lowpan header. */
313 /* Copy the packet so that the IPv6 header is
316 local_skb
= skb_copy_expand(skb
, NET_SKB_PAD
- 1,
317 skb_tailroom(skb
), GFP_ATOMIC
);
321 local_skb
->protocol
= htons(ETH_P_IPV6
);
322 local_skb
->pkt_type
= PACKET_HOST
;
323 local_skb
->dev
= dev
;
325 skb_set_transport_header(local_skb
, sizeof(struct ipv6hdr
));
327 if (give_skb_to_upper(local_skb
, dev
) != NET_RX_SUCCESS
) {
328 kfree_skb(local_skb
);
332 dev
->stats
.rx_bytes
+= skb
->len
;
333 dev
->stats
.rx_packets
++;
335 consume_skb(local_skb
);
337 } else if (lowpan_is_iphc(*skb_network_header(skb
))) {
338 local_skb
= skb_clone(skb
, GFP_ATOMIC
);
342 local_skb
->dev
= dev
;
344 ret
= iphc_decompress(local_skb
, dev
, chan
);
346 kfree_skb(local_skb
);
350 local_skb
->protocol
= htons(ETH_P_IPV6
);
351 local_skb
->pkt_type
= PACKET_HOST
;
353 if (give_skb_to_upper(local_skb
, dev
)
355 kfree_skb(local_skb
);
359 dev
->stats
.rx_bytes
+= skb
->len
;
360 dev
->stats
.rx_packets
++;
362 consume_skb(local_skb
);
368 return NET_RX_SUCCESS
;
371 dev
->stats
.rx_dropped
++;
375 /* Packet from BT LE device */
376 static int chan_recv_cb(struct l2cap_chan
*chan
, struct sk_buff
*skb
)
378 struct lowpan_dev
*dev
;
379 struct lowpan_peer
*peer
;
382 peer
= lookup_peer(chan
->conn
);
386 dev
= lookup_dev(chan
->conn
);
387 if (!dev
|| !dev
->netdev
)
390 err
= recv_pkt(skb
, dev
->netdev
, chan
);
392 BT_DBG("recv pkt %d", err
);
399 static u8
get_addr_type_from_eui64(u8 byte
)
401 /* Is universal(0) or local(1) bit */
402 return ((byte
& 0x02) ? BDADDR_LE_RANDOM
: BDADDR_LE_PUBLIC
);
405 static void copy_to_bdaddr(struct in6_addr
*ip6_daddr
, bdaddr_t
*addr
)
407 u8
*eui64
= ip6_daddr
->s6_addr
+ 8;
409 addr
->b
[0] = eui64
[7];
410 addr
->b
[1] = eui64
[6];
411 addr
->b
[2] = eui64
[5];
412 addr
->b
[3] = eui64
[2];
413 addr
->b
[4] = eui64
[1];
414 addr
->b
[5] = eui64
[0];
417 static void convert_dest_bdaddr(struct in6_addr
*ip6_daddr
,
418 bdaddr_t
*addr
, u8
*addr_type
)
420 copy_to_bdaddr(ip6_daddr
, addr
);
422 /* We need to toggle the U/L bit that we got from IPv6 address
423 * so that we get the proper address and type of the BD address.
427 *addr_type
= get_addr_type_from_eui64(addr
->b
[5]);
430 static int setup_header(struct sk_buff
*skb
, struct net_device
*netdev
,
431 bdaddr_t
*peer_addr
, u8
*peer_addr_type
)
433 struct in6_addr ipv6_daddr
;
434 struct lowpan_dev
*dev
;
435 struct lowpan_peer
*peer
;
436 bdaddr_t addr
, *any
= BDADDR_ANY
;
440 dev
= lowpan_dev(netdev
);
442 memcpy(&ipv6_daddr
, &lowpan_cb(skb
)->addr
, sizeof(ipv6_daddr
));
444 if (ipv6_addr_is_multicast(&ipv6_daddr
)) {
445 lowpan_cb(skb
)->chan
= NULL
;
449 /* Get destination BT device from skb.
450 * If there is no such peer then discard the packet.
452 convert_dest_bdaddr(&ipv6_daddr
, &addr
, &addr_type
);
454 BT_DBG("dest addr %pMR type %d IP %pI6c", &addr
,
455 addr_type
, &ipv6_daddr
);
457 peer
= peer_lookup_ba(dev
, &addr
, addr_type
);
459 /* The packet might be sent to 6lowpan interface
460 * because of routing (either via default route
461 * or user set route) so get peer according to
462 * the destination address.
464 peer
= peer_lookup_dst(dev
, &ipv6_daddr
, skb
);
466 BT_DBG("no such peer %pMR found", &addr
);
471 daddr
= peer
->eui64_addr
;
473 *peer_addr_type
= addr_type
;
474 lowpan_cb(skb
)->chan
= peer
->chan
;
479 lowpan_header_compress(skb
, netdev
, daddr
, dev
->netdev
->dev_addr
);
481 err
= dev_hard_header(skb
, netdev
, ETH_P_IPV6
, NULL
, NULL
, 0);
488 static int header_create(struct sk_buff
*skb
, struct net_device
*netdev
,
489 unsigned short type
, const void *_daddr
,
490 const void *_saddr
, unsigned int len
)
494 if (type
!= ETH_P_IPV6
)
499 memcpy(&lowpan_cb(skb
)->addr
, &hdr
->daddr
, sizeof(struct in6_addr
));
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_dev
*entry
;
551 list_for_each_entry_rcu(entry
, &bt_6lowpan_devices
, list
) {
552 struct lowpan_peer
*pentry
;
553 struct lowpan_dev
*dev
;
555 if (entry
->netdev
!= netdev
)
558 dev
= lowpan_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
;
633 static void bt_set_lockdep_class_one(struct net_device
*dev
,
634 struct netdev_queue
*txq
,
637 lockdep_set_class(&txq
->_xmit_lock
, &bt_netdev_xmit_lock_key
);
640 static int bt_dev_init(struct net_device
*dev
)
642 netdev_for_each_tx_queue(dev
, bt_set_lockdep_class_one
, NULL
);
643 dev
->qdisc_tx_busylock
= &bt_tx_busylock
;
648 static const struct net_device_ops netdev_ops
= {
649 .ndo_init
= bt_dev_init
,
650 .ndo_start_xmit
= bt_xmit
,
653 static struct header_ops header_ops
= {
654 .create
= header_create
,
657 static void netdev_setup(struct net_device
*dev
)
659 dev
->hard_header_len
= 0;
660 dev
->needed_tailroom
= 0;
661 dev
->flags
= IFF_RUNNING
| IFF_POINTOPOINT
|
663 dev
->watchdog_timeo
= 0;
665 dev
->netdev_ops
= &netdev_ops
;
666 dev
->header_ops
= &header_ops
;
667 dev
->destructor
= free_netdev
;
670 static struct device_type bt_type
= {
674 static void set_addr(u8
*eui
, u8
*addr
, u8 addr_type
)
676 /* addr is the BT address in little-endian format */
686 /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
687 if (addr_type
== BDADDR_LE_PUBLIC
)
692 BT_DBG("type %d addr %*phC", addr_type
, 8, eui
);
695 static void set_dev_addr(struct net_device
*netdev
, bdaddr_t
*addr
,
698 netdev
->addr_assign_type
= NET_ADDR_PERM
;
699 set_addr(netdev
->dev_addr
, addr
->b
, addr_type
);
702 static void ifup(struct net_device
*netdev
)
707 err
= dev_open(netdev
);
709 BT_INFO("iface %s cannot be opened (%d)", netdev
->name
, err
);
713 static void ifdown(struct net_device
*netdev
)
718 err
= dev_close(netdev
);
720 BT_INFO("iface %s cannot be closed (%d)", netdev
->name
, err
);
724 static void do_notify_peers(struct work_struct
*work
)
726 struct lowpan_dev
*dev
= container_of(work
, struct lowpan_dev
,
729 netdev_notify_peers(dev
->netdev
); /* send neighbour adv at startup */
732 static bool is_bt_6lowpan(struct hci_conn
*hcon
)
734 if (hcon
->type
!= LE_LINK
)
743 static struct l2cap_chan
*chan_create(void)
745 struct l2cap_chan
*chan
;
747 chan
= l2cap_chan_create();
751 l2cap_chan_set_defaults(chan
);
753 chan
->chan_type
= L2CAP_CHAN_CONN_ORIENTED
;
754 chan
->mode
= L2CAP_MODE_LE_FLOWCTL
;
760 static void set_ip_addr_bits(u8 addr_type
, u8
*addr
)
762 if (addr_type
== BDADDR_LE_PUBLIC
)
768 static struct l2cap_chan
*add_peer_chan(struct l2cap_chan
*chan
,
769 struct lowpan_dev
*dev
)
771 struct lowpan_peer
*peer
;
773 peer
= kzalloc(sizeof(*peer
), GFP_ATOMIC
);
778 memset(&peer
->peer_addr
, 0, sizeof(struct in6_addr
));
781 peer
->peer_addr
.s6_addr
[0] = 0xFE;
782 peer
->peer_addr
.s6_addr
[1] = 0x80;
783 set_addr((u8
*)&peer
->peer_addr
.s6_addr
+ 8, chan
->dst
.b
,
786 memcpy(&peer
->eui64_addr
, (u8
*)&peer
->peer_addr
.s6_addr
+ 8,
789 /* IPv6 address needs to have the U/L bit set properly so toggle
792 set_ip_addr_bits(chan
->dst_type
, (u8
*)&peer
->peer_addr
.s6_addr
+ 8);
794 spin_lock(&devices_lock
);
795 INIT_LIST_HEAD(&peer
->list
);
797 spin_unlock(&devices_lock
);
799 /* Notifying peers about us needs to be done without locks held */
800 INIT_DELAYED_WORK(&dev
->notify_peers
, do_notify_peers
);
801 schedule_delayed_work(&dev
->notify_peers
, msecs_to_jiffies(100));
806 static int setup_netdev(struct l2cap_chan
*chan
, struct lowpan_dev
**dev
)
808 struct net_device
*netdev
;
811 netdev
= alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_dev
)),
812 IFACE_NAME_TEMPLATE
, NET_NAME_UNKNOWN
,
817 set_dev_addr(netdev
, &chan
->src
, chan
->src_type
);
819 netdev
->netdev_ops
= &netdev_ops
;
820 SET_NETDEV_DEV(netdev
, &chan
->conn
->hcon
->hdev
->dev
);
821 SET_NETDEV_DEVTYPE(netdev
, &bt_type
);
823 *dev
= lowpan_dev(netdev
);
824 (*dev
)->netdev
= netdev
;
825 (*dev
)->hdev
= chan
->conn
->hcon
->hdev
;
826 INIT_LIST_HEAD(&(*dev
)->peers
);
828 spin_lock(&devices_lock
);
829 INIT_LIST_HEAD(&(*dev
)->list
);
830 list_add_rcu(&(*dev
)->list
, &bt_6lowpan_devices
);
831 spin_unlock(&devices_lock
);
833 err
= lowpan_register_netdev(netdev
, LOWPAN_LLTYPE_BTLE
);
835 BT_INFO("register_netdev failed %d", err
);
836 spin_lock(&devices_lock
);
837 list_del_rcu(&(*dev
)->list
);
838 spin_unlock(&devices_lock
);
843 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
844 netdev
->ifindex
, &chan
->dst
, chan
->dst_type
,
845 &chan
->src
, chan
->src_type
);
846 set_bit(__LINK_STATE_PRESENT
, &netdev
->state
);
854 static inline void chan_ready_cb(struct l2cap_chan
*chan
)
856 struct lowpan_dev
*dev
;
858 dev
= lookup_dev(chan
->conn
);
860 BT_DBG("chan %p conn %p dev %p", chan
, chan
->conn
, dev
);
863 if (setup_netdev(chan
, &dev
) < 0) {
864 l2cap_chan_del(chan
, -ENOENT
);
869 if (!try_module_get(THIS_MODULE
))
872 add_peer_chan(chan
, dev
);
876 static inline struct l2cap_chan
*chan_new_conn_cb(struct l2cap_chan
*pchan
)
878 struct l2cap_chan
*chan
;
880 chan
= chan_create();
884 chan
->ops
= pchan
->ops
;
886 BT_DBG("chan %p pchan %p", chan
, pchan
);
891 static void delete_netdev(struct work_struct
*work
)
893 struct lowpan_dev
*entry
= container_of(work
, struct lowpan_dev
,
896 lowpan_unregister_netdev(entry
->netdev
);
898 /* The entry pointer is deleted by the netdev destructor. */
901 static void chan_close_cb(struct l2cap_chan
*chan
)
903 struct lowpan_dev
*entry
;
904 struct lowpan_dev
*dev
= NULL
;
905 struct lowpan_peer
*peer
;
907 bool last
= false, remove
= true;
909 BT_DBG("chan %p conn %p", chan
, chan
->conn
);
911 if (chan
->conn
&& chan
->conn
->hcon
) {
912 if (!is_bt_6lowpan(chan
->conn
->hcon
))
915 /* If conn is set, then the netdev is also there and we should
921 spin_lock(&devices_lock
);
923 list_for_each_entry_rcu(entry
, &bt_6lowpan_devices
, list
) {
924 dev
= lowpan_dev(entry
->netdev
);
925 peer
= __peer_lookup_chan(dev
, chan
);
927 last
= peer_del(dev
, peer
);
930 BT_DBG("dev %p removing %speer %p", dev
,
931 last
? "last " : "1 ", peer
);
932 BT_DBG("chan %p orig refcnt %d", chan
,
933 atomic_read(&chan
->kref
.refcount
));
935 l2cap_chan_put(chan
);
940 if (!err
&& last
&& dev
&& !atomic_read(&dev
->peer_count
)) {
941 spin_unlock(&devices_lock
);
943 cancel_delayed_work_sync(&dev
->notify_peers
);
948 INIT_WORK(&entry
->delete_netdev
, delete_netdev
);
949 schedule_work(&entry
->delete_netdev
);
952 spin_unlock(&devices_lock
);
958 static void chan_state_change_cb(struct l2cap_chan
*chan
, int state
, int err
)
960 BT_DBG("chan %p conn %p state %s err %d", chan
, chan
->conn
,
961 state_to_string(state
), err
);
964 static struct sk_buff
*chan_alloc_skb_cb(struct l2cap_chan
*chan
,
965 unsigned long hdr_len
,
966 unsigned long len
, int nb
)
968 /* Note that we must allocate using GFP_ATOMIC here as
969 * this function is called originally from netdev hard xmit
970 * function in atomic context.
972 return bt_skb_alloc(hdr_len
+ len
, GFP_ATOMIC
);
975 static void chan_suspend_cb(struct l2cap_chan
*chan
)
977 struct sk_buff
*skb
= chan
->data
;
979 BT_DBG("chan %p conn %p skb %p", chan
, chan
->conn
, skb
);
984 lowpan_cb(skb
)->status
= -EAGAIN
;
987 static void chan_resume_cb(struct l2cap_chan
*chan
)
989 struct sk_buff
*skb
= chan
->data
;
991 BT_DBG("chan %p conn %p skb %p", chan
, chan
->conn
, skb
);
996 lowpan_cb(skb
)->status
= 0;
999 static long chan_get_sndtimeo_cb(struct l2cap_chan
*chan
)
1001 return L2CAP_CONN_TIMEOUT
;
1004 static const struct l2cap_ops bt_6lowpan_chan_ops
= {
1005 .name
= "L2CAP 6LoWPAN channel",
1006 .new_connection
= chan_new_conn_cb
,
1007 .recv
= chan_recv_cb
,
1008 .close
= chan_close_cb
,
1009 .state_change
= chan_state_change_cb
,
1010 .ready
= chan_ready_cb
,
1011 .resume
= chan_resume_cb
,
1012 .suspend
= chan_suspend_cb
,
1013 .get_sndtimeo
= chan_get_sndtimeo_cb
,
1014 .alloc_skb
= chan_alloc_skb_cb
,
1016 .teardown
= l2cap_chan_no_teardown
,
1017 .defer
= l2cap_chan_no_defer
,
1018 .set_shutdown
= l2cap_chan_no_set_shutdown
,
1021 static inline __u8
bdaddr_type(__u8 type
)
1023 if (type
== ADDR_LE_DEV_PUBLIC
)
1024 return BDADDR_LE_PUBLIC
;
1026 return BDADDR_LE_RANDOM
;
1029 static int bt_6lowpan_connect(bdaddr_t
*addr
, u8 dst_type
)
1031 struct l2cap_chan
*chan
;
1034 chan
= chan_create();
1038 chan
->ops
= &bt_6lowpan_chan_ops
;
1040 err
= l2cap_chan_connect(chan
, cpu_to_le16(L2CAP_PSM_IPSP
), 0,
1043 BT_DBG("chan %p err %d", chan
, err
);
1045 l2cap_chan_put(chan
);
1050 static int bt_6lowpan_disconnect(struct l2cap_conn
*conn
, u8 dst_type
)
1052 struct lowpan_peer
*peer
;
1054 BT_DBG("conn %p dst type %d", conn
, dst_type
);
1056 peer
= lookup_peer(conn
);
1060 BT_DBG("peer %p chan %p", peer
, peer
->chan
);
1062 l2cap_chan_close(peer
->chan
, ENOENT
);
1067 static struct l2cap_chan
*bt_6lowpan_listen(void)
1069 bdaddr_t
*addr
= BDADDR_ANY
;
1070 struct l2cap_chan
*chan
;
1073 if (!enable_6lowpan
)
1076 chan
= chan_create();
1080 chan
->ops
= &bt_6lowpan_chan_ops
;
1081 chan
->state
= BT_LISTEN
;
1082 chan
->src_type
= BDADDR_LE_PUBLIC
;
1084 atomic_set(&chan
->nesting
, L2CAP_NESTING_PARENT
);
1086 BT_DBG("chan %p src type %d", chan
, chan
->src_type
);
1088 err
= l2cap_add_psm(chan
, addr
, cpu_to_le16(L2CAP_PSM_IPSP
));
1090 l2cap_chan_put(chan
);
1091 BT_ERR("psm cannot be added err %d", err
);
1098 static int get_l2cap_conn(char *buf
, bdaddr_t
*addr
, u8
*addr_type
,
1099 struct l2cap_conn
**conn
)
1101 struct hci_conn
*hcon
;
1102 struct hci_dev
*hdev
;
1103 bdaddr_t
*src
= BDADDR_ANY
;
1106 n
= sscanf(buf
, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
1107 &addr
->b
[5], &addr
->b
[4], &addr
->b
[3],
1108 &addr
->b
[2], &addr
->b
[1], &addr
->b
[0],
1114 hdev
= hci_get_route(addr
, src
);
1119 hcon
= hci_conn_hash_lookup_le(hdev
, addr
, *addr_type
);
1120 hci_dev_unlock(hdev
);
1125 *conn
= (struct l2cap_conn
*)hcon
->l2cap_data
;
1127 BT_DBG("conn %p dst %pMR type %d", *conn
, &hcon
->dst
, hcon
->dst_type
);
1132 static void disconnect_all_peers(void)
1134 struct lowpan_dev
*entry
;
1135 struct lowpan_peer
*peer
, *tmp_peer
, *new_peer
;
1136 struct list_head peers
;
1138 INIT_LIST_HEAD(&peers
);
1140 /* We make a separate list of peers as the close_cb() will
1141 * modify the device peers list so it is better not to mess
1142 * with the same list at the same time.
1147 list_for_each_entry_rcu(entry
, &bt_6lowpan_devices
, list
) {
1148 list_for_each_entry_rcu(peer
, &entry
->peers
, list
) {
1149 new_peer
= kmalloc(sizeof(*new_peer
), GFP_ATOMIC
);
1153 new_peer
->chan
= peer
->chan
;
1154 INIT_LIST_HEAD(&new_peer
->list
);
1156 list_add(&new_peer
->list
, &peers
);
1162 spin_lock(&devices_lock
);
1163 list_for_each_entry_safe(peer
, tmp_peer
, &peers
, list
) {
1164 l2cap_chan_close(peer
->chan
, ENOENT
);
1166 list_del_rcu(&peer
->list
);
1167 kfree_rcu(peer
, rcu
);
1169 spin_unlock(&devices_lock
);
1173 struct work_struct work
;
1177 static void do_enable_set(struct work_struct
*work
)
1179 struct set_enable
*set_enable
= container_of(work
,
1180 struct set_enable
, work
);
1182 if (!set_enable
->flag
|| enable_6lowpan
!= set_enable
->flag
)
1183 /* Disconnect existing connections if 6lowpan is
1186 disconnect_all_peers();
1188 enable_6lowpan
= set_enable
->flag
;
1191 l2cap_chan_close(listen_chan
, 0);
1192 l2cap_chan_put(listen_chan
);
1195 listen_chan
= bt_6lowpan_listen();
1200 static int lowpan_enable_set(void *data
, u64 val
)
1202 struct set_enable
*set_enable
;
1204 set_enable
= kzalloc(sizeof(*set_enable
), GFP_KERNEL
);
1208 set_enable
->flag
= !!val
;
1209 INIT_WORK(&set_enable
->work
, do_enable_set
);
1211 schedule_work(&set_enable
->work
);
1216 static int lowpan_enable_get(void *data
, u64
*val
)
1218 *val
= enable_6lowpan
;
1222 DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops
, lowpan_enable_get
,
1223 lowpan_enable_set
, "%llu\n");
1225 static ssize_t
lowpan_control_write(struct file
*fp
,
1226 const char __user
*user_buffer
,
1231 size_t buf_size
= min(count
, sizeof(buf
) - 1);
1235 struct l2cap_conn
*conn
= NULL
;
1237 if (copy_from_user(buf
, user_buffer
, buf_size
))
1240 buf
[buf_size
] = '\0';
1242 if (memcmp(buf
, "connect ", 8) == 0) {
1243 ret
= get_l2cap_conn(&buf
[8], &addr
, &addr_type
, &conn
);
1248 l2cap_chan_close(listen_chan
, 0);
1249 l2cap_chan_put(listen_chan
);
1254 struct lowpan_peer
*peer
;
1256 if (!is_bt_6lowpan(conn
->hcon
))
1259 peer
= lookup_peer(conn
);
1261 BT_DBG("6LoWPAN connection already exists");
1265 BT_DBG("conn %p dst %pMR type %d user %d", conn
,
1266 &conn
->hcon
->dst
, conn
->hcon
->dst_type
,
1270 ret
= bt_6lowpan_connect(&addr
, addr_type
);
1277 if (memcmp(buf
, "disconnect ", 11) == 0) {
1278 ret
= get_l2cap_conn(&buf
[11], &addr
, &addr_type
, &conn
);
1282 ret
= bt_6lowpan_disconnect(conn
, addr_type
);
1292 static int lowpan_control_show(struct seq_file
*f
, void *ptr
)
1294 struct lowpan_dev
*entry
;
1295 struct lowpan_peer
*peer
;
1297 spin_lock(&devices_lock
);
1299 list_for_each_entry(entry
, &bt_6lowpan_devices
, list
) {
1300 list_for_each_entry(peer
, &entry
->peers
, list
)
1301 seq_printf(f
, "%pMR (type %u)\n",
1302 &peer
->chan
->dst
, peer
->chan
->dst_type
);
1305 spin_unlock(&devices_lock
);
1310 static int lowpan_control_open(struct inode
*inode
, struct file
*file
)
1312 return single_open(file
, lowpan_control_show
, inode
->i_private
);
1315 static const struct file_operations lowpan_control_fops
= {
1316 .open
= lowpan_control_open
,
1318 .write
= lowpan_control_write
,
1319 .llseek
= seq_lseek
,
1320 .release
= single_release
,
1323 static void disconnect_devices(void)
1325 struct lowpan_dev
*entry
, *tmp
, *new_dev
;
1326 struct list_head devices
;
1328 INIT_LIST_HEAD(&devices
);
1330 /* We make a separate list of devices because the unregister_netdev()
1331 * will call device_event() which will also want to modify the same
1337 list_for_each_entry_rcu(entry
, &bt_6lowpan_devices
, list
) {
1338 new_dev
= kmalloc(sizeof(*new_dev
), GFP_ATOMIC
);
1342 new_dev
->netdev
= entry
->netdev
;
1343 INIT_LIST_HEAD(&new_dev
->list
);
1345 list_add_rcu(&new_dev
->list
, &devices
);
1350 list_for_each_entry_safe(entry
, tmp
, &devices
, list
) {
1351 ifdown(entry
->netdev
);
1352 BT_DBG("Unregistering netdev %s %p",
1353 entry
->netdev
->name
, entry
->netdev
);
1354 lowpan_unregister_netdev(entry
->netdev
);
1359 static int device_event(struct notifier_block
*unused
,
1360 unsigned long event
, void *ptr
)
1362 struct net_device
*netdev
= netdev_notifier_info_to_dev(ptr
);
1363 struct lowpan_dev
*entry
;
1365 if (netdev
->type
!= ARPHRD_6LOWPAN
)
1369 case NETDEV_UNREGISTER
:
1370 spin_lock(&devices_lock
);
1371 list_for_each_entry(entry
, &bt_6lowpan_devices
, list
) {
1372 if (entry
->netdev
== netdev
) {
1373 BT_DBG("Unregistered netdev %s %p",
1374 netdev
->name
, netdev
);
1375 list_del(&entry
->list
);
1379 spin_unlock(&devices_lock
);
1386 static struct notifier_block bt_6lowpan_dev_notifier
= {
1387 .notifier_call
= device_event
,
1390 static int __init
bt_6lowpan_init(void)
1392 lowpan_enable_debugfs
= debugfs_create_file("6lowpan_enable", 0644,
1394 &lowpan_enable_fops
);
1395 lowpan_control_debugfs
= debugfs_create_file("6lowpan_control", 0644,
1397 &lowpan_control_fops
);
1399 return register_netdevice_notifier(&bt_6lowpan_dev_notifier
);
1402 static void __exit
bt_6lowpan_exit(void)
1404 debugfs_remove(lowpan_enable_debugfs
);
1405 debugfs_remove(lowpan_control_debugfs
);
1408 l2cap_chan_close(listen_chan
, 0);
1409 l2cap_chan_put(listen_chan
);
1412 disconnect_devices();
1414 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier
);
1417 module_init(bt_6lowpan_init
);
1418 module_exit(bt_6lowpan_exit
);
1420 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1421 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1422 MODULE_VERSION(VERSION
);
1423 MODULE_LICENSE("GPL");