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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 struct neighbour *neigh;
168
169 BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
170
171 if (!rt) {
172 if (ipv6_addr_any(&lowpan_cb(skb)->gw)) {
173
174
175
176 nexthop = daddr;
177 } else {
178
179
180 nexthop = &lowpan_cb(skb)->gw;
181 }
182 } else {
183 nexthop = rt6_nexthop(rt, daddr);
184
185
186
187
188
189 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
190 }
191
192 BT_DBG("gw %pI6c", nexthop);
193
194 rcu_read_lock();
195
196 list_for_each_entry_rcu(peer, &dev->peers, list) {
197 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
198 &peer->chan->dst, peer->chan->dst_type,
199 &peer->peer_addr);
200
201 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
202 rcu_read_unlock();
203 return peer;
204 }
205 }
206
207
208
209 neigh = __ipv6_neigh_lookup(dev->netdev, nexthop);
210 if (neigh) {
211 list_for_each_entry_rcu(peer, &dev->peers, list) {
212 if (!memcmp(neigh->ha, peer->lladdr, ETH_ALEN)) {
213 neigh_release(neigh);
214 rcu_read_unlock();
215 return peer;
216 }
217 }
218 neigh_release(neigh);
219 }
220
221 rcu_read_unlock();
222
223 return NULL;
224}
225
226static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
227{
228 struct lowpan_btle_dev *entry;
229 struct lowpan_peer *peer = NULL;
230
231 rcu_read_lock();
232
233 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
234 peer = __peer_lookup_conn(entry, conn);
235 if (peer)
236 break;
237 }
238
239 rcu_read_unlock();
240
241 return peer;
242}
243
244static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn)
245{
246 struct lowpan_btle_dev *entry;
247 struct lowpan_btle_dev *dev = NULL;
248
249 rcu_read_lock();
250
251 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
252 if (conn->hcon->hdev == entry->hdev) {
253 dev = entry;
254 break;
255 }
256 }
257
258 rcu_read_unlock();
259
260 return dev;
261}
262
263static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
264{
265 struct sk_buff *skb_cp;
266
267 skb_cp = skb_copy(skb, GFP_ATOMIC);
268 if (!skb_cp)
269 return NET_RX_DROP;
270
271 return netif_rx_ni(skb_cp);
272}
273
274static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
275 struct lowpan_peer *peer)
276{
277 const u8 *saddr;
278
279 saddr = peer->lladdr;
280
281 return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr);
282}
283
284static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
285 struct lowpan_peer *peer)
286{
287 struct sk_buff *local_skb;
288 int ret;
289
290 if (!netif_running(dev))
291 goto drop;
292
293 if (dev->type != ARPHRD_6LOWPAN || !skb->len)
294 goto drop;
295
296 skb_reset_network_header(skb);
297
298 skb = skb_share_check(skb, GFP_ATOMIC);
299 if (!skb)
300 goto drop;
301
302
303 if (lowpan_is_ipv6(*skb_network_header(skb))) {
304
305 skb_pull(skb, 1);
306
307
308
309
310 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
311 skb_tailroom(skb), GFP_ATOMIC);
312 if (!local_skb)
313 goto drop;
314
315 local_skb->protocol = htons(ETH_P_IPV6);
316 local_skb->pkt_type = PACKET_HOST;
317 local_skb->dev = dev;
318
319 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
320
321 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
322 kfree_skb(local_skb);
323 goto drop;
324 }
325
326 dev->stats.rx_bytes += skb->len;
327 dev->stats.rx_packets++;
328
329 consume_skb(local_skb);
330 consume_skb(skb);
331 } else if (lowpan_is_iphc(*skb_network_header(skb))) {
332 local_skb = skb_clone(skb, GFP_ATOMIC);
333 if (!local_skb)
334 goto drop;
335
336 local_skb->dev = dev;
337
338 ret = iphc_decompress(local_skb, dev, peer);
339 if (ret < 0) {
340 BT_DBG("iphc_decompress failed: %d", ret);
341 kfree_skb(local_skb);
342 goto drop;
343 }
344
345 local_skb->protocol = htons(ETH_P_IPV6);
346 local_skb->pkt_type = PACKET_HOST;
347
348 if (give_skb_to_upper(local_skb, dev)
349 != NET_RX_SUCCESS) {
350 kfree_skb(local_skb);
351 goto drop;
352 }
353
354 dev->stats.rx_bytes += skb->len;
355 dev->stats.rx_packets++;
356
357 consume_skb(local_skb);
358 consume_skb(skb);
359 } else {
360 BT_DBG("unknown packet type");
361 goto drop;
362 }
363
364 return NET_RX_SUCCESS;
365
366drop:
367 dev->stats.rx_dropped++;
368 return NET_RX_DROP;
369}
370
371
372static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
373{
374 struct lowpan_btle_dev *dev;
375 struct lowpan_peer *peer;
376 int err;
377
378 peer = lookup_peer(chan->conn);
379 if (!peer)
380 return -ENOENT;
381
382 dev = lookup_dev(chan->conn);
383 if (!dev || !dev->netdev)
384 return -ENOENT;
385
386 err = recv_pkt(skb, dev->netdev, peer);
387 if (err) {
388 BT_DBG("recv pkt %d", err);
389 err = -EAGAIN;
390 }
391
392 return err;
393}
394
395static int setup_header(struct sk_buff *skb, struct net_device *netdev,
396 bdaddr_t *peer_addr, u8 *peer_addr_type)
397{
398 struct in6_addr ipv6_daddr;
399 struct ipv6hdr *hdr;
400 struct lowpan_btle_dev *dev;
401 struct lowpan_peer *peer;
402 u8 *daddr;
403 int err, status = 0;
404
405 hdr = ipv6_hdr(skb);
406
407 dev = lowpan_btle_dev(netdev);
408
409 memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr));
410
411 if (ipv6_addr_is_multicast(&ipv6_daddr)) {
412 lowpan_cb(skb)->chan = NULL;
413 daddr = NULL;
414 } else {
415 BT_DBG("dest IP %pI6c", &ipv6_daddr);
416
417
418
419
420
421
422 peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
423 if (!peer) {
424 BT_DBG("no such peer");
425 return -ENOENT;
426 }
427
428 daddr = peer->lladdr;
429 *peer_addr = peer->chan->dst;
430 *peer_addr_type = peer->chan->dst_type;
431 lowpan_cb(skb)->chan = peer->chan;
432
433 status = 1;
434 }
435
436 lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr);
437
438 err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
439 if (err < 0)
440 return err;
441
442 return status;
443}
444
445static int header_create(struct sk_buff *skb, struct net_device *netdev,
446 unsigned short type, const void *_daddr,
447 const void *_saddr, unsigned int len)
448{
449 if (type != ETH_P_IPV6)
450 return -EINVAL;
451
452 return 0;
453}
454
455
456static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
457 struct net_device *netdev)
458{
459 struct msghdr msg;
460 struct kvec iv;
461 int err;
462
463
464
465
466 chan->data = skb;
467
468 iv.iov_base = skb->data;
469 iv.iov_len = skb->len;
470
471 memset(&msg, 0, sizeof(msg));
472 iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, skb->len);
473
474 err = l2cap_chan_send(chan, &msg, skb->len);
475 if (err > 0) {
476 netdev->stats.tx_bytes += err;
477 netdev->stats.tx_packets++;
478 return 0;
479 }
480
481 if (err < 0)
482 netdev->stats.tx_errors++;
483
484 return err;
485}
486
487static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
488{
489 struct sk_buff *local_skb;
490 struct lowpan_btle_dev *entry;
491 int err = 0;
492
493 rcu_read_lock();
494
495 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
496 struct lowpan_peer *pentry;
497 struct lowpan_btle_dev *dev;
498
499 if (entry->netdev != netdev)
500 continue;
501
502 dev = lowpan_btle_dev(entry->netdev);
503
504 list_for_each_entry_rcu(pentry, &dev->peers, list) {
505 int ret;
506
507 local_skb = skb_clone(skb, GFP_ATOMIC);
508
509 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
510 netdev->name,
511 &pentry->chan->dst, pentry->chan->dst_type,
512 &pentry->peer_addr, pentry->chan);
513 ret = send_pkt(pentry->chan, local_skb, netdev);
514 if (ret < 0)
515 err = ret;
516
517 kfree_skb(local_skb);
518 }
519 }
520
521 rcu_read_unlock();
522
523 return err;
524}
525
526static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
527{
528 int err = 0;
529 bdaddr_t addr;
530 u8 addr_type;
531
532
533
534
535 skb = skb_unshare(skb, GFP_ATOMIC);
536 if (!skb)
537 return NET_XMIT_DROP;
538
539
540
541
542
543
544 err = setup_header(skb, netdev, &addr, &addr_type);
545 if (err < 0) {
546 kfree_skb(skb);
547 return NET_XMIT_DROP;
548 }
549
550 if (err) {
551 if (lowpan_cb(skb)->chan) {
552 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
553 netdev->name, &addr, addr_type,
554 &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
555 err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
556 } else {
557 err = -ENOENT;
558 }
559 } else {
560
561
562
563 err = send_mcast_pkt(skb, netdev);
564 }
565
566 dev_kfree_skb(skb);
567
568 if (err)
569 BT_DBG("ERROR: xmit failed (%d)", err);
570
571 return err < 0 ? NET_XMIT_DROP : err;
572}
573
574static int bt_dev_init(struct net_device *dev)
575{
576 netdev_lockdep_set_classes(dev);
577
578 return 0;
579}
580
581static const struct net_device_ops netdev_ops = {
582 .ndo_init = bt_dev_init,
583 .ndo_start_xmit = bt_xmit,
584};
585
586static const struct header_ops header_ops = {
587 .create = header_create,
588};
589
590static void netdev_setup(struct net_device *dev)
591{
592 dev->hard_header_len = 0;
593 dev->needed_tailroom = 0;
594 dev->flags = IFF_RUNNING | IFF_MULTICAST;
595 dev->watchdog_timeo = 0;
596 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
597
598 dev->netdev_ops = &netdev_ops;
599 dev->header_ops = &header_ops;
600 dev->needs_free_netdev = true;
601}
602
603static struct device_type bt_type = {
604 .name = "bluetooth",
605};
606
607static void ifup(struct net_device *netdev)
608{
609 int err;
610
611 rtnl_lock();
612 err = dev_open(netdev, NULL);
613 if (err < 0)
614 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
615 rtnl_unlock();
616}
617
618static void ifdown(struct net_device *netdev)
619{
620 rtnl_lock();
621 dev_close(netdev);
622 rtnl_unlock();
623}
624
625static void do_notify_peers(struct work_struct *work)
626{
627 struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev,
628 notify_peers.work);
629
630 netdev_notify_peers(dev->netdev);
631}
632
633static bool is_bt_6lowpan(struct hci_conn *hcon)
634{
635 if (hcon->type != LE_LINK)
636 return false;
637
638 if (!enable_6lowpan)
639 return false;
640
641 return true;
642}
643
644static struct l2cap_chan *chan_create(void)
645{
646 struct l2cap_chan *chan;
647
648 chan = l2cap_chan_create();
649 if (!chan)
650 return NULL;
651
652 l2cap_chan_set_defaults(chan);
653
654 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
655 chan->mode = L2CAP_MODE_LE_FLOWCTL;
656 chan->imtu = 1280;
657
658 return chan;
659}
660
661static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
662 struct lowpan_btle_dev *dev,
663 bool new_netdev)
664{
665 struct lowpan_peer *peer;
666
667 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
668 if (!peer)
669 return NULL;
670
671 peer->chan = chan;
672 memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
673
674 baswap((void *)peer->lladdr, &chan->dst);
675
676 lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr);
677
678 spin_lock(&devices_lock);
679 INIT_LIST_HEAD(&peer->list);
680 peer_add(dev, peer);
681 spin_unlock(&devices_lock);
682
683
684 if (new_netdev)
685 INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
686 schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
687
688 return peer->chan;
689}
690
691static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
692{
693 struct net_device *netdev;
694 int err = 0;
695
696 netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
697 IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
698 netdev_setup);
699 if (!netdev)
700 return -ENOMEM;
701
702 netdev->addr_assign_type = NET_ADDR_PERM;
703 baswap((void *)netdev->dev_addr, &chan->src);
704
705 netdev->netdev_ops = &netdev_ops;
706 SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
707 SET_NETDEV_DEVTYPE(netdev, &bt_type);
708
709 *dev = lowpan_btle_dev(netdev);
710 (*dev)->netdev = netdev;
711 (*dev)->hdev = chan->conn->hcon->hdev;
712 INIT_LIST_HEAD(&(*dev)->peers);
713
714 spin_lock(&devices_lock);
715 INIT_LIST_HEAD(&(*dev)->list);
716 list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
717 spin_unlock(&devices_lock);
718
719 err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE);
720 if (err < 0) {
721 BT_INFO("register_netdev failed %d", err);
722 spin_lock(&devices_lock);
723 list_del_rcu(&(*dev)->list);
724 spin_unlock(&devices_lock);
725 free_netdev(netdev);
726 goto out;
727 }
728
729 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
730 netdev->ifindex, &chan->dst, chan->dst_type,
731 &chan->src, chan->src_type);
732 set_bit(__LINK_STATE_PRESENT, &netdev->state);
733
734 return 0;
735
736out:
737 return err;
738}
739
740static inline void chan_ready_cb(struct l2cap_chan *chan)
741{
742 struct lowpan_btle_dev *dev;
743 bool new_netdev = false;
744
745 dev = lookup_dev(chan->conn);
746
747 BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
748
749 if (!dev) {
750 if (setup_netdev(chan, &dev) < 0) {
751 l2cap_chan_del(chan, -ENOENT);
752 return;
753 }
754 new_netdev = true;
755 }
756
757 if (!try_module_get(THIS_MODULE))
758 return;
759
760 add_peer_chan(chan, dev, new_netdev);
761 ifup(dev->netdev);
762}
763
764static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
765{
766 struct l2cap_chan *chan;
767
768 chan = chan_create();
769 if (!chan)
770 return NULL;
771
772 chan->ops = pchan->ops;
773
774 BT_DBG("chan %p pchan %p", chan, pchan);
775
776 return chan;
777}
778
779static void delete_netdev(struct work_struct *work)
780{
781 struct lowpan_btle_dev *entry = container_of(work,
782 struct lowpan_btle_dev,
783 delete_netdev);
784
785 lowpan_unregister_netdev(entry->netdev);
786
787
788}
789
790static void chan_close_cb(struct l2cap_chan *chan)
791{
792 struct lowpan_btle_dev *entry;
793 struct lowpan_btle_dev *dev = NULL;
794 struct lowpan_peer *peer;
795 int err = -ENOENT;
796 bool last = false, remove = true;
797
798 BT_DBG("chan %p conn %p", chan, chan->conn);
799
800 if (chan->conn && chan->conn->hcon) {
801 if (!is_bt_6lowpan(chan->conn->hcon))
802 return;
803
804
805
806
807 remove = false;
808 }
809
810 spin_lock(&devices_lock);
811
812 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
813 dev = lowpan_btle_dev(entry->netdev);
814 peer = __peer_lookup_chan(dev, chan);
815 if (peer) {
816 last = peer_del(dev, peer);
817 err = 0;
818
819 BT_DBG("dev %p removing %speer %p", dev,
820 last ? "last " : "1 ", peer);
821 BT_DBG("chan %p orig refcnt %d", chan,
822 kref_read(&chan->kref));
823
824 l2cap_chan_put(chan);
825 break;
826 }
827 }
828
829 if (!err && last && dev && !atomic_read(&dev->peer_count)) {
830 spin_unlock(&devices_lock);
831
832 cancel_delayed_work_sync(&dev->notify_peers);
833
834 ifdown(dev->netdev);
835
836 if (remove) {
837 INIT_WORK(&entry->delete_netdev, delete_netdev);
838 schedule_work(&entry->delete_netdev);
839 }
840 } else {
841 spin_unlock(&devices_lock);
842 }
843
844 return;
845}
846
847static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
848{
849 BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
850 state_to_string(state), err);
851}
852
853static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
854 unsigned long hdr_len,
855 unsigned long len, int nb)
856{
857
858
859
860
861 return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
862}
863
864static void chan_suspend_cb(struct l2cap_chan *chan)
865{
866 struct lowpan_btle_dev *dev;
867
868 BT_DBG("chan %p suspend", chan);
869
870 dev = lookup_dev(chan->conn);
871 if (!dev || !dev->netdev)
872 return;
873
874 netif_stop_queue(dev->netdev);
875}
876
877static void chan_resume_cb(struct l2cap_chan *chan)
878{
879 struct lowpan_btle_dev *dev;
880
881 BT_DBG("chan %p resume", chan);
882
883 dev = lookup_dev(chan->conn);
884 if (!dev || !dev->netdev)
885 return;
886
887 netif_wake_queue(dev->netdev);
888}
889
890static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
891{
892 return L2CAP_CONN_TIMEOUT;
893}
894
895static const struct l2cap_ops bt_6lowpan_chan_ops = {
896 .name = "L2CAP 6LoWPAN channel",
897 .new_connection = chan_new_conn_cb,
898 .recv = chan_recv_cb,
899 .close = chan_close_cb,
900 .state_change = chan_state_change_cb,
901 .ready = chan_ready_cb,
902 .resume = chan_resume_cb,
903 .suspend = chan_suspend_cb,
904 .get_sndtimeo = chan_get_sndtimeo_cb,
905 .alloc_skb = chan_alloc_skb_cb,
906
907 .teardown = l2cap_chan_no_teardown,
908 .defer = l2cap_chan_no_defer,
909 .set_shutdown = l2cap_chan_no_set_shutdown,
910};
911
912static inline __u8 bdaddr_type(__u8 type)
913{
914 if (type == ADDR_LE_DEV_PUBLIC)
915 return BDADDR_LE_PUBLIC;
916 else
917 return BDADDR_LE_RANDOM;
918}
919
920static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
921{
922 struct l2cap_chan *chan;
923 int err;
924
925 chan = chan_create();
926 if (!chan)
927 return -EINVAL;
928
929 chan->ops = &bt_6lowpan_chan_ops;
930
931 err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
932 addr, dst_type);
933
934 BT_DBG("chan %p err %d", chan, err);
935 if (err < 0)
936 l2cap_chan_put(chan);
937
938 return err;
939}
940
941static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
942{
943 struct lowpan_peer *peer;
944
945 BT_DBG("conn %p dst type %d", conn, dst_type);
946
947 peer = lookup_peer(conn);
948 if (!peer)
949 return -ENOENT;
950
951 BT_DBG("peer %p chan %p", peer, peer->chan);
952
953 l2cap_chan_close(peer->chan, ENOENT);
954
955 return 0;
956}
957
958static struct l2cap_chan *bt_6lowpan_listen(void)
959{
960 bdaddr_t *addr = BDADDR_ANY;
961 struct l2cap_chan *chan;
962 int err;
963
964 if (!enable_6lowpan)
965 return NULL;
966
967 chan = chan_create();
968 if (!chan)
969 return NULL;
970
971 chan->ops = &bt_6lowpan_chan_ops;
972 chan->state = BT_LISTEN;
973 chan->src_type = BDADDR_LE_PUBLIC;
974
975 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
976
977 BT_DBG("chan %p src type %d", chan, chan->src_type);
978
979 err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
980 if (err) {
981 l2cap_chan_put(chan);
982 BT_ERR("psm cannot be added err %d", err);
983 return NULL;
984 }
985
986 return chan;
987}
988
989static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
990 struct l2cap_conn **conn)
991{
992 struct hci_conn *hcon;
993 struct hci_dev *hdev;
994 int n;
995
996 n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
997 &addr->b[5], &addr->b[4], &addr->b[3],
998 &addr->b[2], &addr->b[1], &addr->b[0],
999 addr_type);
1000
1001 if (n < 7)
1002 return -EINVAL;
1003
1004
1005 hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC);
1006 if (!hdev)
1007 return -ENOENT;
1008
1009 hci_dev_lock(hdev);
1010 hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type);
1011 hci_dev_unlock(hdev);
1012
1013 if (!hcon)
1014 return -ENOENT;
1015
1016 *conn = (struct l2cap_conn *)hcon->l2cap_data;
1017
1018 BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1019
1020 return 0;
1021}
1022
1023static void disconnect_all_peers(void)
1024{
1025 struct lowpan_btle_dev *entry;
1026 struct lowpan_peer *peer, *tmp_peer, *new_peer;
1027 struct list_head peers;
1028
1029 INIT_LIST_HEAD(&peers);
1030
1031
1032
1033
1034
1035
1036 rcu_read_lock();
1037
1038 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1039 list_for_each_entry_rcu(peer, &entry->peers, list) {
1040 new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1041 if (!new_peer)
1042 break;
1043
1044 new_peer->chan = peer->chan;
1045 INIT_LIST_HEAD(&new_peer->list);
1046
1047 list_add(&new_peer->list, &peers);
1048 }
1049 }
1050
1051 rcu_read_unlock();
1052
1053 spin_lock(&devices_lock);
1054 list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1055 l2cap_chan_close(peer->chan, ENOENT);
1056
1057 list_del_rcu(&peer->list);
1058 kfree_rcu(peer, rcu);
1059 }
1060 spin_unlock(&devices_lock);
1061}
1062
1063struct set_enable {
1064 struct work_struct work;
1065 bool flag;
1066};
1067
1068static void do_enable_set(struct work_struct *work)
1069{
1070 struct set_enable *set_enable = container_of(work,
1071 struct set_enable, work);
1072
1073 if (!set_enable->flag || enable_6lowpan != set_enable->flag)
1074
1075
1076
1077 disconnect_all_peers();
1078
1079 enable_6lowpan = set_enable->flag;
1080
1081 if (listen_chan) {
1082 l2cap_chan_close(listen_chan, 0);
1083 l2cap_chan_put(listen_chan);
1084 }
1085
1086 listen_chan = bt_6lowpan_listen();
1087
1088 kfree(set_enable);
1089}
1090
1091static int lowpan_enable_set(void *data, u64 val)
1092{
1093 struct set_enable *set_enable;
1094
1095 set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
1096 if (!set_enable)
1097 return -ENOMEM;
1098
1099 set_enable->flag = !!val;
1100 INIT_WORK(&set_enable->work, do_enable_set);
1101
1102 schedule_work(&set_enable->work);
1103
1104 return 0;
1105}
1106
1107static int lowpan_enable_get(void *data, u64 *val)
1108{
1109 *val = enable_6lowpan;
1110 return 0;
1111}
1112
1113DEFINE_DEBUGFS_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
1114 lowpan_enable_set, "%llu\n");
1115
1116static ssize_t lowpan_control_write(struct file *fp,
1117 const char __user *user_buffer,
1118 size_t count,
1119 loff_t *position)
1120{
1121 char buf[32];
1122 size_t buf_size = min(count, sizeof(buf) - 1);
1123 int ret;
1124 bdaddr_t addr;
1125 u8 addr_type;
1126 struct l2cap_conn *conn = NULL;
1127
1128 if (copy_from_user(buf, user_buffer, buf_size))
1129 return -EFAULT;
1130
1131 buf[buf_size] = '\0';
1132
1133 if (memcmp(buf, "connect ", 8) == 0) {
1134 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1135 if (ret == -EINVAL)
1136 return ret;
1137
1138 if (listen_chan) {
1139 l2cap_chan_close(listen_chan, 0);
1140 l2cap_chan_put(listen_chan);
1141 listen_chan = NULL;
1142 }
1143
1144 if (conn) {
1145 struct lowpan_peer *peer;
1146
1147 if (!is_bt_6lowpan(conn->hcon))
1148 return -EINVAL;
1149
1150 peer = lookup_peer(conn);
1151 if (peer) {
1152 BT_DBG("6LoWPAN connection already exists");
1153 return -EALREADY;
1154 }
1155
1156 BT_DBG("conn %p dst %pMR type %d user %d", conn,
1157 &conn->hcon->dst, conn->hcon->dst_type,
1158 addr_type);
1159 }
1160
1161 ret = bt_6lowpan_connect(&addr, addr_type);
1162 if (ret < 0)
1163 return ret;
1164
1165 return count;
1166 }
1167
1168 if (memcmp(buf, "disconnect ", 11) == 0) {
1169 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1170 if (ret < 0)
1171 return ret;
1172
1173 ret = bt_6lowpan_disconnect(conn, addr_type);
1174 if (ret < 0)
1175 return ret;
1176
1177 return count;
1178 }
1179
1180 return count;
1181}
1182
1183static int lowpan_control_show(struct seq_file *f, void *ptr)
1184{
1185 struct lowpan_btle_dev *entry;
1186 struct lowpan_peer *peer;
1187
1188 spin_lock(&devices_lock);
1189
1190 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1191 list_for_each_entry(peer, &entry->peers, list)
1192 seq_printf(f, "%pMR (type %u)\n",
1193 &peer->chan->dst, peer->chan->dst_type);
1194 }
1195
1196 spin_unlock(&devices_lock);
1197
1198 return 0;
1199}
1200
1201static int lowpan_control_open(struct inode *inode, struct file *file)
1202{
1203 return single_open(file, lowpan_control_show, inode->i_private);
1204}
1205
1206static const struct file_operations lowpan_control_fops = {
1207 .open = lowpan_control_open,
1208 .read = seq_read,
1209 .write = lowpan_control_write,
1210 .llseek = seq_lseek,
1211 .release = single_release,
1212};
1213
1214static void disconnect_devices(void)
1215{
1216 struct lowpan_btle_dev *entry, *tmp, *new_dev;
1217 struct list_head devices;
1218
1219 INIT_LIST_HEAD(&devices);
1220
1221
1222
1223
1224
1225
1226 rcu_read_lock();
1227
1228 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1229 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1230 if (!new_dev)
1231 break;
1232
1233 new_dev->netdev = entry->netdev;
1234 INIT_LIST_HEAD(&new_dev->list);
1235
1236 list_add_rcu(&new_dev->list, &devices);
1237 }
1238
1239 rcu_read_unlock();
1240
1241 list_for_each_entry_safe(entry, tmp, &devices, list) {
1242 ifdown(entry->netdev);
1243 BT_DBG("Unregistering netdev %s %p",
1244 entry->netdev->name, entry->netdev);
1245 lowpan_unregister_netdev(entry->netdev);
1246 kfree(entry);
1247 }
1248}
1249
1250static int device_event(struct notifier_block *unused,
1251 unsigned long event, void *ptr)
1252{
1253 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1254 struct lowpan_btle_dev *entry;
1255
1256 if (netdev->type != ARPHRD_6LOWPAN)
1257 return NOTIFY_DONE;
1258
1259 switch (event) {
1260 case NETDEV_UNREGISTER:
1261 spin_lock(&devices_lock);
1262 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1263 if (entry->netdev == netdev) {
1264 BT_DBG("Unregistered netdev %s %p",
1265 netdev->name, netdev);
1266 list_del(&entry->list);
1267 break;
1268 }
1269 }
1270 spin_unlock(&devices_lock);
1271 break;
1272 }
1273
1274 return NOTIFY_DONE;
1275}
1276
1277static struct notifier_block bt_6lowpan_dev_notifier = {
1278 .notifier_call = device_event,
1279};
1280
1281static int __init bt_6lowpan_init(void)
1282{
1283 lowpan_enable_debugfs = debugfs_create_file_unsafe("6lowpan_enable",
1284 0644, bt_debugfs,
1285 NULL,
1286 &lowpan_enable_fops);
1287 lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1288 bt_debugfs, NULL,
1289 &lowpan_control_fops);
1290
1291 return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1292}
1293
1294static void __exit bt_6lowpan_exit(void)
1295{
1296 debugfs_remove(lowpan_enable_debugfs);
1297 debugfs_remove(lowpan_control_debugfs);
1298
1299 if (listen_chan) {
1300 l2cap_chan_close(listen_chan, 0);
1301 l2cap_chan_put(listen_chan);
1302 }
1303
1304 disconnect_devices();
1305
1306 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1307}
1308
1309module_init(bt_6lowpan_init);
1310module_exit(bt_6lowpan_exit);
1311
1312MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1313MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1314MODULE_VERSION(VERSION);
1315MODULE_LICENSE("GPL");
1316