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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>
12
13#include <net/ipv6.h>
14#include <net/ip6_route.h>
15#include <net/addrconf.h>
16#include <net/pkt_sched.h>
17
18#include <net/bluetooth/bluetooth.h>
19#include <net/bluetooth/hci_core.h>
20#include <net/bluetooth/l2cap.h>
21
22#include <net/6lowpan.h>
23
24#define VERSION "0.1"
25
26static struct dentry *lowpan_enable_debugfs;
27static struct dentry *lowpan_control_debugfs;
28
29#define IFACE_NAME_TEMPLATE "bt%d"
30
31struct skb_cb {
32 struct in6_addr addr;
33 struct in6_addr gw;
34 struct l2cap_chan *chan;
35};
36#define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
37
38
39
40
41
42
43
44
45static LIST_HEAD(bt_6lowpan_devices);
46static DEFINE_SPINLOCK(devices_lock);
47
48static bool enable_6lowpan;
49
50
51
52static struct l2cap_chan *listen_chan;
53
54struct lowpan_peer {
55 struct list_head list;
56 struct rcu_head rcu;
57 struct l2cap_chan *chan;
58
59
60 unsigned char lladdr[ETH_ALEN];
61 struct in6_addr peer_addr;
62};
63
64struct lowpan_btle_dev {
65 struct list_head list;
66
67 struct hci_dev *hdev;
68 struct net_device *netdev;
69 struct list_head peers;
70 atomic_t peer_count;
71
72 struct work_struct delete_netdev;
73 struct delayed_work notify_peers;
74};
75
76static inline struct lowpan_btle_dev *
77lowpan_btle_dev(const struct net_device *netdev)
78{
79 return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv;
80}
81
82static inline void peer_add(struct lowpan_btle_dev *dev,
83 struct lowpan_peer *peer)
84{
85 list_add_rcu(&peer->list, &dev->peers);
86 atomic_inc(&dev->peer_count);
87}
88
89static inline bool peer_del(struct lowpan_btle_dev *dev,
90 struct lowpan_peer *peer)
91{
92 list_del_rcu(&peer->list);
93 kfree_rcu(peer, rcu);
94
95 module_put(THIS_MODULE);
96
97 if (atomic_dec_and_test(&dev->peer_count)) {
98 BT_DBG("last peer");
99 return true;
100 }
101
102 return false;
103}
104
105static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_btle_dev *dev,
106 bdaddr_t *ba, __u8 type)
107{
108 struct lowpan_peer *peer;
109
110 BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
111 ba, type);
112
113 rcu_read_lock();
114
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);
118
119 if (bacmp(&peer->chan->dst, ba))
120 continue;
121
122 if (type == peer->chan->dst_type) {
123 rcu_read_unlock();
124 return peer;
125 }
126 }
127
128 rcu_read_unlock();
129
130 return NULL;
131}
132
133static inline struct lowpan_peer *
134__peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan)
135{
136 struct lowpan_peer *peer;
137
138 list_for_each_entry_rcu(peer, &dev->peers, list) {
139 if (peer->chan == chan)
140 return peer;
141 }
142
143 return NULL;
144}
145
146static inline struct lowpan_peer *
147__peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn)
148{
149 struct lowpan_peer *peer;
150
151 list_for_each_entry_rcu(peer, &dev->peers, list) {
152 if (peer->chan->conn == conn)
153 return peer;
154 }
155
156 return NULL;
157}
158
159static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev,
160 struct in6_addr *daddr,
161 struct sk_buff *skb)
162{
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
168 BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
169
170
171
172
173
174 if (count == 1) {
175 rcu_read_lock();
176 peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer,
177 list);
178 rcu_read_unlock();
179 return peer;
180 }
181
182 if (!rt) {
183 nexthop = &lowpan_cb(skb)->gw;
184
185 if (ipv6_addr_any(nexthop))
186 return NULL;
187 } else {
188 nexthop = rt6_nexthop(rt, daddr);
189
190
191
192
193
194 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
195 }
196
197 BT_DBG("gw %pI6c", nexthop);
198
199 rcu_read_lock();
200
201 list_for_each_entry_rcu(peer, &dev->peers, list) {
202 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
203 &peer->chan->dst, peer->chan->dst_type,
204 &peer->peer_addr);
205
206 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
207 rcu_read_unlock();
208 return peer;
209 }
210 }
211
212 rcu_read_unlock();
213
214 return NULL;
215}
216
217static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
218{
219 struct lowpan_btle_dev *entry;
220 struct lowpan_peer *peer = NULL;
221
222 rcu_read_lock();
223
224 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
225 peer = __peer_lookup_conn(entry, conn);
226 if (peer)
227 break;
228 }
229
230 rcu_read_unlock();
231
232 return peer;
233}
234
235static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn)
236{
237 struct lowpan_btle_dev *entry;
238 struct lowpan_btle_dev *dev = NULL;
239
240 rcu_read_lock();
241
242 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
243 if (conn->hcon->hdev == entry->hdev) {
244 dev = entry;
245 break;
246 }
247 }
248
249 rcu_read_unlock();
250
251 return dev;
252}
253
254static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
255{
256 struct sk_buff *skb_cp;
257
258 skb_cp = skb_copy(skb, GFP_ATOMIC);
259 if (!skb_cp)
260 return NET_RX_DROP;
261
262 return netif_rx_ni(skb_cp);
263}
264
265static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
266 struct lowpan_peer *peer)
267{
268 const u8 *saddr;
269
270 saddr = peer->lladdr;
271
272 return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr);
273}
274
275static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
276 struct lowpan_peer *peer)
277{
278 struct sk_buff *local_skb;
279 int ret;
280
281 if (!netif_running(dev))
282 goto drop;
283
284 if (dev->type != ARPHRD_6LOWPAN || !skb->len)
285 goto drop;
286
287 skb_reset_network_header(skb);
288
289 skb = skb_share_check(skb, GFP_ATOMIC);
290 if (!skb)
291 goto drop;
292
293
294 if (lowpan_is_ipv6(*skb_network_header(skb))) {
295
296 skb_pull(skb, 1);
297
298
299
300
301 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
302 skb_tailroom(skb), GFP_ATOMIC);
303 if (!local_skb)
304 goto drop;
305
306 local_skb->protocol = htons(ETH_P_IPV6);
307 local_skb->pkt_type = PACKET_HOST;
308 local_skb->dev = dev;
309
310 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
311
312 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
313 kfree_skb(local_skb);
314 goto drop;
315 }
316
317 dev->stats.rx_bytes += skb->len;
318 dev->stats.rx_packets++;
319
320 consume_skb(local_skb);
321 consume_skb(skb);
322 } else if (lowpan_is_iphc(*skb_network_header(skb))) {
323 local_skb = skb_clone(skb, GFP_ATOMIC);
324 if (!local_skb)
325 goto drop;
326
327 local_skb->dev = dev;
328
329 ret = iphc_decompress(local_skb, dev, peer);
330 if (ret < 0) {
331 BT_DBG("iphc_decompress failed: %d", ret);
332 kfree_skb(local_skb);
333 goto drop;
334 }
335
336 local_skb->protocol = htons(ETH_P_IPV6);
337 local_skb->pkt_type = PACKET_HOST;
338
339 if (give_skb_to_upper(local_skb, dev)
340 != NET_RX_SUCCESS) {
341 kfree_skb(local_skb);
342 goto drop;
343 }
344
345 dev->stats.rx_bytes += skb->len;
346 dev->stats.rx_packets++;
347
348 consume_skb(local_skb);
349 consume_skb(skb);
350 } else {
351 BT_DBG("unknown packet type");
352 goto drop;
353 }
354
355 return NET_RX_SUCCESS;
356
357drop:
358 dev->stats.rx_dropped++;
359 return NET_RX_DROP;
360}
361
362
363static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
364{
365 struct lowpan_btle_dev *dev;
366 struct lowpan_peer *peer;
367 int err;
368
369 peer = lookup_peer(chan->conn);
370 if (!peer)
371 return -ENOENT;
372
373 dev = lookup_dev(chan->conn);
374 if (!dev || !dev->netdev)
375 return -ENOENT;
376
377 err = recv_pkt(skb, dev->netdev, peer);
378 if (err) {
379 BT_DBG("recv pkt %d", err);
380 err = -EAGAIN;
381 }
382
383 return err;
384}
385
386static int setup_header(struct sk_buff *skb, struct net_device *netdev,
387 bdaddr_t *peer_addr, u8 *peer_addr_type)
388{
389 struct in6_addr ipv6_daddr;
390 struct ipv6hdr *hdr;
391 struct lowpan_btle_dev *dev;
392 struct lowpan_peer *peer;
393 u8 *daddr;
394 int err, status = 0;
395
396 hdr = ipv6_hdr(skb);
397
398 dev = lowpan_btle_dev(netdev);
399
400 memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr));
401
402 if (ipv6_addr_is_multicast(&ipv6_daddr)) {
403 lowpan_cb(skb)->chan = NULL;
404 daddr = NULL;
405 } else {
406 BT_DBG("dest IP %pI6c", &ipv6_daddr);
407
408
409
410
411
412
413 peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
414 if (!peer) {
415 BT_DBG("no such peer");
416 return -ENOENT;
417 }
418
419 daddr = peer->lladdr;
420 *peer_addr = peer->chan->dst;
421 *peer_addr_type = peer->chan->dst_type;
422 lowpan_cb(skb)->chan = peer->chan;
423
424 status = 1;
425 }
426
427 lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr);
428
429 err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
430 if (err < 0)
431 return err;
432
433 return status;
434}
435
436static int header_create(struct sk_buff *skb, struct net_device *netdev,
437 unsigned short type, const void *_daddr,
438 const void *_saddr, unsigned int len)
439{
440 if (type != ETH_P_IPV6)
441 return -EINVAL;
442
443 return 0;
444}
445
446
447static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
448 struct net_device *netdev)
449{
450 struct msghdr msg;
451 struct kvec iv;
452 int err;
453
454
455
456
457 chan->data = skb;
458
459 iv.iov_base = skb->data;
460 iv.iov_len = skb->len;
461
462 memset(&msg, 0, sizeof(msg));
463 iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, skb->len);
464
465 err = l2cap_chan_send(chan, &msg, skb->len);
466 if (err > 0) {
467 netdev->stats.tx_bytes += err;
468 netdev->stats.tx_packets++;
469 return 0;
470 }
471
472 if (err < 0)
473 netdev->stats.tx_errors++;
474
475 return err;
476}
477
478static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
479{
480 struct sk_buff *local_skb;
481 struct lowpan_btle_dev *entry;
482 int err = 0;
483
484 rcu_read_lock();
485
486 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
487 struct lowpan_peer *pentry;
488 struct lowpan_btle_dev *dev;
489
490 if (entry->netdev != netdev)
491 continue;
492
493 dev = lowpan_btle_dev(entry->netdev);
494
495 list_for_each_entry_rcu(pentry, &dev->peers, list) {
496 int ret;
497
498 local_skb = skb_clone(skb, GFP_ATOMIC);
499
500 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
501 netdev->name,
502 &pentry->chan->dst, pentry->chan->dst_type,
503 &pentry->peer_addr, pentry->chan);
504 ret = send_pkt(pentry->chan, local_skb, netdev);
505 if (ret < 0)
506 err = ret;
507
508 kfree_skb(local_skb);
509 }
510 }
511
512 rcu_read_unlock();
513
514 return err;
515}
516
517static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
518{
519 int err = 0;
520 bdaddr_t addr;
521 u8 addr_type;
522
523
524
525
526 skb = skb_unshare(skb, GFP_ATOMIC);
527 if (!skb)
528 return NET_XMIT_DROP;
529
530
531
532
533
534
535 err = setup_header(skb, netdev, &addr, &addr_type);
536 if (err < 0) {
537 kfree_skb(skb);
538 return NET_XMIT_DROP;
539 }
540
541 if (err) {
542 if (lowpan_cb(skb)->chan) {
543 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
544 netdev->name, &addr, addr_type,
545 &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
546 err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
547 } else {
548 err = -ENOENT;
549 }
550 } else {
551
552
553
554 err = send_mcast_pkt(skb, netdev);
555 }
556
557 dev_kfree_skb(skb);
558
559 if (err)
560 BT_DBG("ERROR: xmit failed (%d)", err);
561
562 return err < 0 ? NET_XMIT_DROP : err;
563}
564
565static int bt_dev_init(struct net_device *dev)
566{
567 netdev_lockdep_set_classes(dev);
568
569 return 0;
570}
571
572static const struct net_device_ops netdev_ops = {
573 .ndo_init = bt_dev_init,
574 .ndo_start_xmit = bt_xmit,
575};
576
577static struct header_ops header_ops = {
578 .create = header_create,
579};
580
581static void netdev_setup(struct net_device *dev)
582{
583 dev->hard_header_len = 0;
584 dev->needed_tailroom = 0;
585 dev->flags = IFF_RUNNING | IFF_MULTICAST;
586 dev->watchdog_timeo = 0;
587 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
588
589 dev->netdev_ops = &netdev_ops;
590 dev->header_ops = &header_ops;
591 dev->needs_free_netdev = true;
592}
593
594static struct device_type bt_type = {
595 .name = "bluetooth",
596};
597
598static void ifup(struct net_device *netdev)
599{
600 int err;
601
602 rtnl_lock();
603 err = dev_open(netdev, NULL);
604 if (err < 0)
605 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
606 rtnl_unlock();
607}
608
609static void ifdown(struct net_device *netdev)
610{
611 rtnl_lock();
612 dev_close(netdev);
613 rtnl_unlock();
614}
615
616static void do_notify_peers(struct work_struct *work)
617{
618 struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev,
619 notify_peers.work);
620
621 netdev_notify_peers(dev->netdev);
622}
623
624static bool is_bt_6lowpan(struct hci_conn *hcon)
625{
626 if (hcon->type != LE_LINK)
627 return false;
628
629 if (!enable_6lowpan)
630 return false;
631
632 return true;
633}
634
635static struct l2cap_chan *chan_create(void)
636{
637 struct l2cap_chan *chan;
638
639 chan = l2cap_chan_create();
640 if (!chan)
641 return NULL;
642
643 l2cap_chan_set_defaults(chan);
644
645 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
646 chan->mode = L2CAP_MODE_LE_FLOWCTL;
647 chan->imtu = 1280;
648
649 return chan;
650}
651
652static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
653 struct lowpan_btle_dev *dev,
654 bool new_netdev)
655{
656 struct lowpan_peer *peer;
657
658 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
659 if (!peer)
660 return NULL;
661
662 peer->chan = chan;
663 memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
664
665 baswap((void *)peer->lladdr, &chan->dst);
666
667 lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr);
668
669 spin_lock(&devices_lock);
670 INIT_LIST_HEAD(&peer->list);
671 peer_add(dev, peer);
672 spin_unlock(&devices_lock);
673
674
675 if (new_netdev)
676 INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
677 schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
678
679 return peer->chan;
680}
681
682static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
683{
684 struct net_device *netdev;
685 int err = 0;
686
687 netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
688 IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
689 netdev_setup);
690 if (!netdev)
691 return -ENOMEM;
692
693 netdev->addr_assign_type = NET_ADDR_PERM;
694 baswap((void *)netdev->dev_addr, &chan->src);
695
696 netdev->netdev_ops = &netdev_ops;
697 SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
698 SET_NETDEV_DEVTYPE(netdev, &bt_type);
699
700 *dev = lowpan_btle_dev(netdev);
701 (*dev)->netdev = netdev;
702 (*dev)->hdev = chan->conn->hcon->hdev;
703 INIT_LIST_HEAD(&(*dev)->peers);
704
705 spin_lock(&devices_lock);
706 INIT_LIST_HEAD(&(*dev)->list);
707 list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
708 spin_unlock(&devices_lock);
709
710 err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE);
711 if (err < 0) {
712 BT_INFO("register_netdev failed %d", err);
713 spin_lock(&devices_lock);
714 list_del_rcu(&(*dev)->list);
715 spin_unlock(&devices_lock);
716 free_netdev(netdev);
717 goto out;
718 }
719
720 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
721 netdev->ifindex, &chan->dst, chan->dst_type,
722 &chan->src, chan->src_type);
723 set_bit(__LINK_STATE_PRESENT, &netdev->state);
724
725 return 0;
726
727out:
728 return err;
729}
730
731static inline void chan_ready_cb(struct l2cap_chan *chan)
732{
733 struct lowpan_btle_dev *dev;
734 bool new_netdev = false;
735
736 dev = lookup_dev(chan->conn);
737
738 BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
739
740 if (!dev) {
741 if (setup_netdev(chan, &dev) < 0) {
742 l2cap_chan_del(chan, -ENOENT);
743 return;
744 }
745 new_netdev = true;
746 }
747
748 if (!try_module_get(THIS_MODULE))
749 return;
750
751 add_peer_chan(chan, dev, new_netdev);
752 ifup(dev->netdev);
753}
754
755static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
756{
757 struct l2cap_chan *chan;
758
759 chan = chan_create();
760 if (!chan)
761 return NULL;
762
763 chan->ops = pchan->ops;
764
765 BT_DBG("chan %p pchan %p", chan, pchan);
766
767 return chan;
768}
769
770static void delete_netdev(struct work_struct *work)
771{
772 struct lowpan_btle_dev *entry = container_of(work,
773 struct lowpan_btle_dev,
774 delete_netdev);
775
776 lowpan_unregister_netdev(entry->netdev);
777
778
779}
780
781static void chan_close_cb(struct l2cap_chan *chan)
782{
783 struct lowpan_btle_dev *entry;
784 struct lowpan_btle_dev *dev = NULL;
785 struct lowpan_peer *peer;
786 int err = -ENOENT;
787 bool last = false, remove = true;
788
789 BT_DBG("chan %p conn %p", chan, chan->conn);
790
791 if (chan->conn && chan->conn->hcon) {
792 if (!is_bt_6lowpan(chan->conn->hcon))
793 return;
794
795
796
797
798 remove = false;
799 }
800
801 spin_lock(&devices_lock);
802
803 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
804 dev = lowpan_btle_dev(entry->netdev);
805 peer = __peer_lookup_chan(dev, chan);
806 if (peer) {
807 last = peer_del(dev, peer);
808 err = 0;
809
810 BT_DBG("dev %p removing %speer %p", dev,
811 last ? "last " : "1 ", peer);
812 BT_DBG("chan %p orig refcnt %d", chan,
813 kref_read(&chan->kref));
814
815 l2cap_chan_put(chan);
816 break;
817 }
818 }
819
820 if (!err && last && dev && !atomic_read(&dev->peer_count)) {
821 spin_unlock(&devices_lock);
822
823 cancel_delayed_work_sync(&dev->notify_peers);
824
825 ifdown(dev->netdev);
826
827 if (remove) {
828 INIT_WORK(&entry->delete_netdev, delete_netdev);
829 schedule_work(&entry->delete_netdev);
830 }
831 } else {
832 spin_unlock(&devices_lock);
833 }
834
835 return;
836}
837
838static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
839{
840 BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
841 state_to_string(state), err);
842}
843
844static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
845 unsigned long hdr_len,
846 unsigned long len, int nb)
847{
848
849
850
851
852 return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
853}
854
855static void chan_suspend_cb(struct l2cap_chan *chan)
856{
857 struct lowpan_btle_dev *dev;
858
859 BT_DBG("chan %p suspend", chan);
860
861 dev = lookup_dev(chan->conn);
862 if (!dev || !dev->netdev)
863 return;
864
865 netif_stop_queue(dev->netdev);
866}
867
868static void chan_resume_cb(struct l2cap_chan *chan)
869{
870 struct lowpan_btle_dev *dev;
871
872 BT_DBG("chan %p resume", chan);
873
874 dev = lookup_dev(chan->conn);
875 if (!dev || !dev->netdev)
876 return;
877
878 netif_wake_queue(dev->netdev);
879}
880
881static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
882{
883 return L2CAP_CONN_TIMEOUT;
884}
885
886static const struct l2cap_ops bt_6lowpan_chan_ops = {
887 .name = "L2CAP 6LoWPAN channel",
888 .new_connection = chan_new_conn_cb,
889 .recv = chan_recv_cb,
890 .close = chan_close_cb,
891 .state_change = chan_state_change_cb,
892 .ready = chan_ready_cb,
893 .resume = chan_resume_cb,
894 .suspend = chan_suspend_cb,
895 .get_sndtimeo = chan_get_sndtimeo_cb,
896 .alloc_skb = chan_alloc_skb_cb,
897
898 .teardown = l2cap_chan_no_teardown,
899 .defer = l2cap_chan_no_defer,
900 .set_shutdown = l2cap_chan_no_set_shutdown,
901};
902
903static inline __u8 bdaddr_type(__u8 type)
904{
905 if (type == ADDR_LE_DEV_PUBLIC)
906 return BDADDR_LE_PUBLIC;
907 else
908 return BDADDR_LE_RANDOM;
909}
910
911static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
912{
913 struct l2cap_chan *chan;
914 int err;
915
916 chan = chan_create();
917 if (!chan)
918 return -EINVAL;
919
920 chan->ops = &bt_6lowpan_chan_ops;
921
922 err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
923 addr, dst_type);
924
925 BT_DBG("chan %p err %d", chan, err);
926 if (err < 0)
927 l2cap_chan_put(chan);
928
929 return err;
930}
931
932static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
933{
934 struct lowpan_peer *peer;
935
936 BT_DBG("conn %p dst type %d", conn, dst_type);
937
938 peer = lookup_peer(conn);
939 if (!peer)
940 return -ENOENT;
941
942 BT_DBG("peer %p chan %p", peer, peer->chan);
943
944 l2cap_chan_close(peer->chan, ENOENT);
945
946 return 0;
947}
948
949static struct l2cap_chan *bt_6lowpan_listen(void)
950{
951 bdaddr_t *addr = BDADDR_ANY;
952 struct l2cap_chan *chan;
953 int err;
954
955 if (!enable_6lowpan)
956 return NULL;
957
958 chan = chan_create();
959 if (!chan)
960 return NULL;
961
962 chan->ops = &bt_6lowpan_chan_ops;
963 chan->state = BT_LISTEN;
964 chan->src_type = BDADDR_LE_PUBLIC;
965
966 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
967
968 BT_DBG("chan %p src type %d", chan, chan->src_type);
969
970 err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
971 if (err) {
972 l2cap_chan_put(chan);
973 BT_ERR("psm cannot be added err %d", err);
974 return NULL;
975 }
976
977 return chan;
978}
979
980static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
981 struct l2cap_conn **conn)
982{
983 struct hci_conn *hcon;
984 struct hci_dev *hdev;
985 int n;
986
987 n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
988 &addr->b[5], &addr->b[4], &addr->b[3],
989 &addr->b[2], &addr->b[1], &addr->b[0],
990 addr_type);
991
992 if (n < 7)
993 return -EINVAL;
994
995
996 hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC);
997 if (!hdev)
998 return -ENOENT;
999
1000 hci_dev_lock(hdev);
1001 hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type);
1002 hci_dev_unlock(hdev);
1003
1004 if (!hcon)
1005 return -ENOENT;
1006
1007 *conn = (struct l2cap_conn *)hcon->l2cap_data;
1008
1009 BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1010
1011 return 0;
1012}
1013
1014static void disconnect_all_peers(void)
1015{
1016 struct lowpan_btle_dev *entry;
1017 struct lowpan_peer *peer, *tmp_peer, *new_peer;
1018 struct list_head peers;
1019
1020 INIT_LIST_HEAD(&peers);
1021
1022
1023
1024
1025
1026
1027 rcu_read_lock();
1028
1029 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1030 list_for_each_entry_rcu(peer, &entry->peers, list) {
1031 new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1032 if (!new_peer)
1033 break;
1034
1035 new_peer->chan = peer->chan;
1036 INIT_LIST_HEAD(&new_peer->list);
1037
1038 list_add(&new_peer->list, &peers);
1039 }
1040 }
1041
1042 rcu_read_unlock();
1043
1044 spin_lock(&devices_lock);
1045 list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1046 l2cap_chan_close(peer->chan, ENOENT);
1047
1048 list_del_rcu(&peer->list);
1049 kfree_rcu(peer, rcu);
1050 }
1051 spin_unlock(&devices_lock);
1052}
1053
1054struct set_enable {
1055 struct work_struct work;
1056 bool flag;
1057};
1058
1059static void do_enable_set(struct work_struct *work)
1060{
1061 struct set_enable *set_enable = container_of(work,
1062 struct set_enable, work);
1063
1064 if (!set_enable->flag || enable_6lowpan != set_enable->flag)
1065
1066
1067
1068 disconnect_all_peers();
1069
1070 enable_6lowpan = set_enable->flag;
1071
1072 if (listen_chan) {
1073 l2cap_chan_close(listen_chan, 0);
1074 l2cap_chan_put(listen_chan);
1075 }
1076
1077 listen_chan = bt_6lowpan_listen();
1078
1079 kfree(set_enable);
1080}
1081
1082static int lowpan_enable_set(void *data, u64 val)
1083{
1084 struct set_enable *set_enable;
1085
1086 set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
1087 if (!set_enable)
1088 return -ENOMEM;
1089
1090 set_enable->flag = !!val;
1091 INIT_WORK(&set_enable->work, do_enable_set);
1092
1093 schedule_work(&set_enable->work);
1094
1095 return 0;
1096}
1097
1098static int lowpan_enable_get(void *data, u64 *val)
1099{
1100 *val = enable_6lowpan;
1101 return 0;
1102}
1103
1104DEFINE_DEBUGFS_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
1105 lowpan_enable_set, "%llu\n");
1106
1107static ssize_t lowpan_control_write(struct file *fp,
1108 const char __user *user_buffer,
1109 size_t count,
1110 loff_t *position)
1111{
1112 char buf[32];
1113 size_t buf_size = min(count, sizeof(buf) - 1);
1114 int ret;
1115 bdaddr_t addr;
1116 u8 addr_type;
1117 struct l2cap_conn *conn = NULL;
1118
1119 if (copy_from_user(buf, user_buffer, buf_size))
1120 return -EFAULT;
1121
1122 buf[buf_size] = '\0';
1123
1124 if (memcmp(buf, "connect ", 8) == 0) {
1125 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1126 if (ret == -EINVAL)
1127 return ret;
1128
1129 if (listen_chan) {
1130 l2cap_chan_close(listen_chan, 0);
1131 l2cap_chan_put(listen_chan);
1132 listen_chan = NULL;
1133 }
1134
1135 if (conn) {
1136 struct lowpan_peer *peer;
1137
1138 if (!is_bt_6lowpan(conn->hcon))
1139 return -EINVAL;
1140
1141 peer = lookup_peer(conn);
1142 if (peer) {
1143 BT_DBG("6LoWPAN connection already exists");
1144 return -EALREADY;
1145 }
1146
1147 BT_DBG("conn %p dst %pMR type %d user %d", conn,
1148 &conn->hcon->dst, conn->hcon->dst_type,
1149 addr_type);
1150 }
1151
1152 ret = bt_6lowpan_connect(&addr, addr_type);
1153 if (ret < 0)
1154 return ret;
1155
1156 return count;
1157 }
1158
1159 if (memcmp(buf, "disconnect ", 11) == 0) {
1160 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1161 if (ret < 0)
1162 return ret;
1163
1164 ret = bt_6lowpan_disconnect(conn, addr_type);
1165 if (ret < 0)
1166 return ret;
1167
1168 return count;
1169 }
1170
1171 return count;
1172}
1173
1174static int lowpan_control_show(struct seq_file *f, void *ptr)
1175{
1176 struct lowpan_btle_dev *entry;
1177 struct lowpan_peer *peer;
1178
1179 spin_lock(&devices_lock);
1180
1181 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1182 list_for_each_entry(peer, &entry->peers, list)
1183 seq_printf(f, "%pMR (type %u)\n",
1184 &peer->chan->dst, peer->chan->dst_type);
1185 }
1186
1187 spin_unlock(&devices_lock);
1188
1189 return 0;
1190}
1191
1192static int lowpan_control_open(struct inode *inode, struct file *file)
1193{
1194 return single_open(file, lowpan_control_show, inode->i_private);
1195}
1196
1197static const struct file_operations lowpan_control_fops = {
1198 .open = lowpan_control_open,
1199 .read = seq_read,
1200 .write = lowpan_control_write,
1201 .llseek = seq_lseek,
1202 .release = single_release,
1203};
1204
1205static void disconnect_devices(void)
1206{
1207 struct lowpan_btle_dev *entry, *tmp, *new_dev;
1208 struct list_head devices;
1209
1210 INIT_LIST_HEAD(&devices);
1211
1212
1213
1214
1215
1216
1217 rcu_read_lock();
1218
1219 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1220 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1221 if (!new_dev)
1222 break;
1223
1224 new_dev->netdev = entry->netdev;
1225 INIT_LIST_HEAD(&new_dev->list);
1226
1227 list_add_rcu(&new_dev->list, &devices);
1228 }
1229
1230 rcu_read_unlock();
1231
1232 list_for_each_entry_safe(entry, tmp, &devices, list) {
1233 ifdown(entry->netdev);
1234 BT_DBG("Unregistering netdev %s %p",
1235 entry->netdev->name, entry->netdev);
1236 lowpan_unregister_netdev(entry->netdev);
1237 kfree(entry);
1238 }
1239}
1240
1241static int device_event(struct notifier_block *unused,
1242 unsigned long event, void *ptr)
1243{
1244 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1245 struct lowpan_btle_dev *entry;
1246
1247 if (netdev->type != ARPHRD_6LOWPAN)
1248 return NOTIFY_DONE;
1249
1250 switch (event) {
1251 case NETDEV_UNREGISTER:
1252 spin_lock(&devices_lock);
1253 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1254 if (entry->netdev == netdev) {
1255 BT_DBG("Unregistered netdev %s %p",
1256 netdev->name, netdev);
1257 list_del(&entry->list);
1258 break;
1259 }
1260 }
1261 spin_unlock(&devices_lock);
1262 break;
1263 }
1264
1265 return NOTIFY_DONE;
1266}
1267
1268static struct notifier_block bt_6lowpan_dev_notifier = {
1269 .notifier_call = device_event,
1270};
1271
1272static int __init bt_6lowpan_init(void)
1273{
1274 lowpan_enable_debugfs = debugfs_create_file_unsafe("6lowpan_enable",
1275 0644, bt_debugfs,
1276 NULL,
1277 &lowpan_enable_fops);
1278 lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1279 bt_debugfs, NULL,
1280 &lowpan_control_fops);
1281
1282 return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1283}
1284
1285static void __exit bt_6lowpan_exit(void)
1286{
1287 debugfs_remove(lowpan_enable_debugfs);
1288 debugfs_remove(lowpan_control_debugfs);
1289
1290 if (listen_chan) {
1291 l2cap_chan_close(listen_chan, 0);
1292 l2cap_chan_put(listen_chan);
1293 }
1294
1295 disconnect_devices();
1296
1297 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1298}
1299
1300module_init(bt_6lowpan_init);
1301module_exit(bt_6lowpan_exit);
1302
1303MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1304MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1305MODULE_VERSION(VERSION);
1306MODULE_LICENSE("GPL");
1307