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/af_ieee802154.h> /* to get the address type */
26 #include <net/bluetooth/bluetooth.h>
27 #include <net/bluetooth/hci_core.h>
28 #include <net/bluetooth/l2cap.h>
30 #include <net/6lowpan.h> /* for the compression support */
34 static struct dentry *lowpan_psm_debugfs;
35 static struct dentry *lowpan_control_debugfs;
37 #define IFACE_NAME_TEMPLATE "bt%d"
38 #define EUI64_ADDR_LEN 8
43 struct l2cap_chan *chan;
46 #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
48 /* The devices list contains those devices that we are acting
49 * as a proxy. The BT 6LoWPAN device is a virtual device that
50 * connects to the Bluetooth LE device. The real connection to
51 * BT device is done via l2cap layer. There exists one
52 * virtual device / one BT 6LoWPAN network (=hciX device).
53 * The list contains struct lowpan_dev elements.
55 static LIST_HEAD(bt_6lowpan_devices);
56 static DEFINE_RWLOCK(devices_lock);
58 /* If psm is set to 0 (default value), then 6lowpan is disabled.
59 * Other values are used to indicate a Protocol Service Multiplexer
62 static u16 psm_6lowpan;
64 /* We are listening incoming connections via this channel
66 static struct l2cap_chan *listen_chan;
69 struct list_head list;
70 struct l2cap_chan *chan;
72 /* peer addresses in various formats */
73 unsigned char eui64_addr[EUI64_ADDR_LEN];
74 struct in6_addr peer_addr;
78 struct list_head list;
81 struct net_device *netdev;
82 struct list_head peers;
83 atomic_t peer_count; /* number of items in peers list */
85 struct work_struct delete_netdev;
86 struct delayed_work notify_peers;
89 static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev)
91 return netdev_priv(netdev);
94 static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer)
96 list_add(&peer->list, &dev->peers);
97 atomic_inc(&dev->peer_count);
100 static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer)
102 list_del(&peer->list);
104 module_put(THIS_MODULE);
106 if (atomic_dec_and_test(&dev->peer_count)) {
114 static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev,
115 bdaddr_t *ba, __u8 type)
117 struct lowpan_peer *peer, *tmp;
119 BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
122 list_for_each_entry_safe(peer, tmp, &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)
136 static inline struct lowpan_peer *peer_lookup_chan(struct lowpan_dev *dev,
137 struct l2cap_chan *chan)
139 struct lowpan_peer *peer, *tmp;
141 list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
142 if (peer->chan == chan)
149 static inline struct lowpan_peer *peer_lookup_conn(struct lowpan_dev *dev,
150 struct l2cap_conn *conn)
152 struct lowpan_peer *peer, *tmp;
154 list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
155 if (peer->chan->conn == conn)
162 static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev,
163 struct in6_addr *daddr,
166 struct lowpan_peer *peer, *tmp;
167 struct in6_addr *nexthop;
168 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
169 int count = atomic_read(&dev->peer_count);
171 BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
173 /* If we have multiple 6lowpan peers, then check where we should
174 * send the packet. If only one peer exists, then we can send the
178 return list_first_entry(&dev->peers, struct lowpan_peer,
182 nexthop = &lowpan_cb(skb)->gw;
184 if (ipv6_addr_any(nexthop))
187 nexthop = rt6_nexthop(rt);
189 /* We need to remember the address because it is needed
190 * by bt_xmit() when sending the packet. In bt_xmit(), the
191 * destination routing info is not set.
193 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
196 BT_DBG("gw %pI6c", nexthop);
198 list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
199 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
200 &peer->chan->dst, peer->chan->dst_type,
203 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop))
210 static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
212 struct lowpan_dev *entry, *tmp;
213 struct lowpan_peer *peer = NULL;
216 read_lock_irqsave(&devices_lock, flags);
218 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
219 peer = peer_lookup_conn(entry, conn);
224 read_unlock_irqrestore(&devices_lock, flags);
229 static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn)
231 struct lowpan_dev *entry, *tmp;
232 struct lowpan_dev *dev = NULL;
235 read_lock_irqsave(&devices_lock, flags);
237 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
238 if (conn->hcon->hdev == entry->hdev) {
244 read_unlock_irqrestore(&devices_lock, flags);
249 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
251 struct sk_buff *skb_cp;
254 skb_cp = skb_copy(skb, GFP_ATOMIC);
258 ret = netif_rx(skb_cp);
260 BT_DBG("receive skb %d", ret);
267 static int process_data(struct sk_buff *skb, struct net_device *netdev,
268 struct l2cap_chan *chan)
270 const u8 *saddr, *daddr;
272 struct lowpan_dev *dev;
273 struct lowpan_peer *peer;
276 dev = lowpan_dev(netdev);
278 read_lock_irqsave(&devices_lock, flags);
279 peer = peer_lookup_chan(dev, chan);
280 read_unlock_irqrestore(&devices_lock, flags);
284 saddr = peer->eui64_addr;
285 daddr = dev->netdev->dev_addr;
287 /* at least two bytes will be used for the encoding */
291 if (lowpan_fetch_skb_u8(skb, &iphc0))
294 if (lowpan_fetch_skb_u8(skb, &iphc1))
297 return lowpan_process_data(skb, netdev,
298 saddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
299 daddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
300 iphc0, iphc1, give_skb_to_upper);
307 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
308 struct l2cap_chan *chan)
310 struct sk_buff *local_skb;
313 if (!netif_running(dev))
316 if (dev->type != ARPHRD_6LOWPAN)
319 /* check that it's our buffer */
320 if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
321 /* Copy the packet so that the IPv6 header is
324 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
325 skb_tailroom(skb), GFP_ATOMIC);
329 local_skb->protocol = htons(ETH_P_IPV6);
330 local_skb->pkt_type = PACKET_HOST;
332 skb_reset_network_header(local_skb);
333 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
335 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
336 kfree_skb(local_skb);
340 dev->stats.rx_bytes += skb->len;
341 dev->stats.rx_packets++;
343 kfree_skb(local_skb);
346 switch (skb->data[0] & 0xe0) {
347 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
348 local_skb = skb_clone(skb, GFP_ATOMIC);
352 ret = process_data(local_skb, dev, chan);
353 if (ret != NET_RX_SUCCESS)
356 dev->stats.rx_bytes += skb->len;
357 dev->stats.rx_packets++;
366 return NET_RX_SUCCESS;
369 dev->stats.rx_dropped++;
374 /* Packet from BT LE device */
375 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
377 struct lowpan_dev *dev;
378 struct lowpan_peer *peer;
381 peer = lookup_peer(chan->conn);
385 dev = lookup_dev(chan->conn);
386 if (!dev || !dev->netdev)
389 err = recv_pkt(skb, dev->netdev, chan);
391 BT_DBG("recv pkt %d", err);
398 static u8 get_addr_type_from_eui64(u8 byte)
400 /* Is universal(0) or local(1) bit */
401 return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
404 static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
406 u8 *eui64 = ip6_daddr->s6_addr + 8;
408 addr->b[0] = eui64[7];
409 addr->b[1] = eui64[6];
410 addr->b[2] = eui64[5];
411 addr->b[3] = eui64[2];
412 addr->b[4] = eui64[1];
413 addr->b[5] = eui64[0];
416 static void convert_dest_bdaddr(struct in6_addr *ip6_daddr,
417 bdaddr_t *addr, u8 *addr_type)
419 copy_to_bdaddr(ip6_daddr, addr);
421 /* We need to toggle the U/L bit that we got from IPv6 address
422 * so that we get the proper address and type of the BD address.
426 *addr_type = get_addr_type_from_eui64(addr->b[5]);
429 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
430 bdaddr_t *peer_addr, u8 *peer_addr_type)
432 struct in6_addr ipv6_daddr;
433 struct lowpan_dev *dev;
434 struct lowpan_peer *peer;
435 bdaddr_t addr, *any = BDADDR_ANY;
439 dev = lowpan_dev(netdev);
441 memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr));
443 if (ipv6_addr_is_multicast(&ipv6_daddr)) {
444 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 read_lock_irqsave(&devices_lock, flags);
458 peer = peer_lookup_ba(dev, &addr, addr_type);
459 read_unlock_irqrestore(&devices_lock, flags);
462 /* The packet might be sent to 6lowpan interface
463 * because of routing (either via default route
464 * or user set route) so get peer according to
465 * the destination address.
467 read_lock_irqsave(&devices_lock, flags);
468 peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
469 read_unlock_irqrestore(&devices_lock, flags);
471 BT_DBG("no such peer %pMR found", &addr);
476 daddr = peer->eui64_addr;
478 *peer_addr_type = addr_type;
479 lowpan_cb(skb)->chan = peer->chan;
484 lowpan_header_compress(skb, netdev, ETH_P_IPV6, daddr,
485 dev->netdev->dev_addr, skb->len);
487 err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
494 static int header_create(struct sk_buff *skb, struct net_device *netdev,
495 unsigned short type, const void *_daddr,
496 const void *_saddr, unsigned int len)
500 if (type != ETH_P_IPV6)
505 memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr));
510 /* Packet to BT LE device */
511 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
512 struct net_device *netdev)
518 /* Remember the skb so that we can send EAGAIN to the caller if
519 * we run out of credits.
523 memset(&msg, 0, sizeof(msg));
524 msg.msg_iov = (struct iovec *) &iv;
526 iv.iov_base = skb->data;
527 iv.iov_len = skb->len;
529 err = l2cap_chan_send(chan, &msg, skb->len);
531 netdev->stats.tx_bytes += err;
532 netdev->stats.tx_packets++;
537 err = lowpan_cb(skb)->status;
541 netdev->stats.tx_dropped++;
543 netdev->stats.tx_errors++;
549 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
551 struct sk_buff *local_skb;
552 struct lowpan_dev *entry, *tmp;
556 read_lock_irqsave(&devices_lock, flags);
558 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
559 struct lowpan_peer *pentry, *ptmp;
560 struct lowpan_dev *dev;
562 if (entry->netdev != netdev)
565 dev = lowpan_dev(entry->netdev);
567 list_for_each_entry_safe(pentry, ptmp, &dev->peers, list) {
570 local_skb = skb_clone(skb, GFP_ATOMIC);
572 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
574 &pentry->chan->dst, pentry->chan->dst_type,
575 &pentry->peer_addr, pentry->chan);
576 ret = send_pkt(pentry->chan, local_skb, netdev);
580 kfree_skb(local_skb);
584 read_unlock_irqrestore(&devices_lock, flags);
589 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
594 struct sk_buff *tmpskb;
596 /* We must take a copy of the skb before we modify/replace the ipv6
597 * header as the header could be used elsewhere
599 tmpskb = skb_unshare(skb, GFP_ATOMIC);
602 return NET_XMIT_DROP;
606 /* Return values from setup_header()
607 * <0 - error, packet is dropped
608 * 0 - this is a multicast packet
609 * 1 - this is unicast packet
611 err = setup_header(skb, netdev, &addr, &addr_type);
614 return NET_XMIT_DROP;
618 if (lowpan_cb(skb)->chan) {
619 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
620 netdev->name, &addr, addr_type,
621 &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
622 err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
627 /* We need to send the packet to every device behind this
630 err = send_mcast_pkt(skb, netdev);
636 BT_DBG("ERROR: xmit failed (%d)", err);
638 return err < 0 ? NET_XMIT_DROP : err;
641 static const struct net_device_ops netdev_ops = {
642 .ndo_start_xmit = bt_xmit,
645 static struct header_ops header_ops = {
646 .create = header_create,
649 static void netdev_setup(struct net_device *dev)
651 dev->addr_len = EUI64_ADDR_LEN;
652 dev->type = ARPHRD_6LOWPAN;
654 dev->hard_header_len = 0;
655 dev->needed_tailroom = 0;
656 dev->mtu = IPV6_MIN_MTU;
657 dev->tx_queue_len = 0;
658 dev->flags = IFF_RUNNING | IFF_POINTOPOINT |
660 dev->watchdog_timeo = 0;
662 dev->netdev_ops = &netdev_ops;
663 dev->header_ops = &header_ops;
664 dev->destructor = free_netdev;
667 static struct device_type bt_type = {
671 static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
673 /* addr is the BT address in little-endian format */
683 /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
684 if (addr_type == BDADDR_LE_PUBLIC)
689 BT_DBG("type %d addr %*phC", addr_type, 8, eui);
692 static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr,
695 netdev->addr_assign_type = NET_ADDR_PERM;
696 set_addr(netdev->dev_addr, addr->b, addr_type);
699 static void ifup(struct net_device *netdev)
704 err = dev_open(netdev);
706 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
710 static void ifdown(struct net_device *netdev)
715 err = dev_close(netdev);
717 BT_INFO("iface %s cannot be closed (%d)", netdev->name, err);
721 static void do_notify_peers(struct work_struct *work)
723 struct lowpan_dev *dev = container_of(work, struct lowpan_dev,
726 netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
729 static bool is_bt_6lowpan(struct hci_conn *hcon)
731 if (hcon->type != LE_LINK)
740 static struct l2cap_chan *chan_create(void)
742 struct l2cap_chan *chan;
744 chan = l2cap_chan_create();
748 l2cap_chan_set_defaults(chan);
750 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
751 chan->mode = L2CAP_MODE_LE_FLOWCTL;
753 chan->imtu = chan->omtu;
758 static struct l2cap_chan *chan_open(struct l2cap_chan *pchan)
760 struct l2cap_chan *chan;
762 chan = chan_create();
766 chan->remote_mps = chan->omtu;
767 chan->mps = chan->omtu;
769 chan->state = BT_CONNECTED;
774 static void set_ip_addr_bits(u8 addr_type, u8 *addr)
776 if (addr_type == BDADDR_LE_PUBLIC)
782 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
783 struct lowpan_dev *dev)
785 struct lowpan_peer *peer;
788 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
793 memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
796 peer->peer_addr.s6_addr[0] = 0xFE;
797 peer->peer_addr.s6_addr[1] = 0x80;
798 set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b,
801 memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
804 /* IPv6 address needs to have the U/L bit set properly so toggle
807 set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8);
809 write_lock_irqsave(&devices_lock, flags);
810 INIT_LIST_HEAD(&peer->list);
812 write_unlock_irqrestore(&devices_lock, flags);
814 /* Notifying peers about us needs to be done without locks held */
815 INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
816 schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
821 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
823 struct net_device *netdev;
827 netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE,
828 NET_NAME_UNKNOWN, netdev_setup);
832 set_dev_addr(netdev, &chan->src, chan->src_type);
834 netdev->netdev_ops = &netdev_ops;
835 SET_NETDEV_DEV(netdev, &chan->conn->hcon->dev);
836 SET_NETDEV_DEVTYPE(netdev, &bt_type);
838 err = register_netdev(netdev);
840 BT_INFO("register_netdev failed %d", err);
845 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
846 netdev->ifindex, &chan->dst, chan->dst_type,
847 &chan->src, chan->src_type);
848 set_bit(__LINK_STATE_PRESENT, &netdev->state);
850 *dev = netdev_priv(netdev);
851 (*dev)->netdev = netdev;
852 (*dev)->hdev = chan->conn->hcon->hdev;
853 INIT_LIST_HEAD(&(*dev)->peers);
855 write_lock_irqsave(&devices_lock, flags);
856 INIT_LIST_HEAD(&(*dev)->list);
857 list_add(&(*dev)->list, &bt_6lowpan_devices);
858 write_unlock_irqrestore(&devices_lock, flags);
866 static inline void chan_ready_cb(struct l2cap_chan *chan)
868 struct lowpan_dev *dev;
870 dev = lookup_dev(chan->conn);
872 BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
875 if (setup_netdev(chan, &dev) < 0) {
876 l2cap_chan_del(chan, -ENOENT);
881 if (!try_module_get(THIS_MODULE))
884 add_peer_chan(chan, dev);
888 static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
890 struct l2cap_chan *chan;
892 chan = chan_open(pchan);
893 chan->ops = pchan->ops;
895 BT_DBG("chan %p pchan %p", chan, pchan);
900 static void delete_netdev(struct work_struct *work)
902 struct lowpan_dev *entry = container_of(work, struct lowpan_dev,
905 unregister_netdev(entry->netdev);
907 /* The entry pointer is deleted in device_event() */
910 static void chan_close_cb(struct l2cap_chan *chan)
912 struct lowpan_dev *entry, *tmp;
913 struct lowpan_dev *dev = NULL;
914 struct lowpan_peer *peer;
917 bool last = false, removed = true;
919 BT_DBG("chan %p conn %p", chan, chan->conn);
921 if (chan->conn && chan->conn->hcon) {
922 if (!is_bt_6lowpan(chan->conn->hcon))
925 /* If conn is set, then the netdev is also there and we should
931 write_lock_irqsave(&devices_lock, flags);
933 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
934 dev = lowpan_dev(entry->netdev);
935 peer = peer_lookup_chan(dev, chan);
937 last = peer_del(dev, peer);
940 BT_DBG("dev %p removing %speer %p", dev,
941 last ? "last " : "1 ", peer);
942 BT_DBG("chan %p orig refcnt %d", chan,
943 atomic_read(&chan->kref.refcount));
945 l2cap_chan_put(chan);
951 if (!err && last && dev && !atomic_read(&dev->peer_count)) {
952 write_unlock_irqrestore(&devices_lock, flags);
954 cancel_delayed_work_sync(&dev->notify_peers);
959 INIT_WORK(&entry->delete_netdev, delete_netdev);
960 schedule_work(&entry->delete_netdev);
963 write_unlock_irqrestore(&devices_lock, flags);
969 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
971 BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
972 state_to_string(state), err);
975 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
976 unsigned long hdr_len,
977 unsigned long len, int nb)
979 /* Note that we must allocate using GFP_ATOMIC here as
980 * this function is called originally from netdev hard xmit
981 * function in atomic context.
983 return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
986 static void chan_suspend_cb(struct l2cap_chan *chan)
988 struct sk_buff *skb = chan->data;
990 BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
995 lowpan_cb(skb)->status = -EAGAIN;
998 static void chan_resume_cb(struct l2cap_chan *chan)
1000 struct sk_buff *skb = chan->data;
1002 BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
1007 lowpan_cb(skb)->status = 0;
1010 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
1012 return L2CAP_CONN_TIMEOUT;
1015 static const struct l2cap_ops bt_6lowpan_chan_ops = {
1016 .name = "L2CAP 6LoWPAN channel",
1017 .new_connection = chan_new_conn_cb,
1018 .recv = chan_recv_cb,
1019 .close = chan_close_cb,
1020 .state_change = chan_state_change_cb,
1021 .ready = chan_ready_cb,
1022 .resume = chan_resume_cb,
1023 .suspend = chan_suspend_cb,
1024 .get_sndtimeo = chan_get_sndtimeo_cb,
1025 .alloc_skb = chan_alloc_skb_cb,
1026 .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec,
1028 .teardown = l2cap_chan_no_teardown,
1029 .defer = l2cap_chan_no_defer,
1030 .set_shutdown = l2cap_chan_no_set_shutdown,
1033 static inline __u8 bdaddr_type(__u8 type)
1035 if (type == ADDR_LE_DEV_PUBLIC)
1036 return BDADDR_LE_PUBLIC;
1038 return BDADDR_LE_RANDOM;
1041 static struct l2cap_chan *chan_get(void)
1043 struct l2cap_chan *pchan;
1045 pchan = chan_create();
1049 pchan->ops = &bt_6lowpan_chan_ops;
1054 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
1056 struct l2cap_chan *pchan;
1063 err = l2cap_chan_connect(pchan, cpu_to_le16(psm_6lowpan), 0,
1066 BT_DBG("chan %p err %d", pchan, err);
1068 l2cap_chan_put(pchan);
1073 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
1075 struct lowpan_peer *peer;
1077 BT_DBG("conn %p dst type %d", conn, dst_type);
1079 peer = lookup_peer(conn);
1083 BT_DBG("peer %p chan %p", peer, peer->chan);
1085 l2cap_chan_close(peer->chan, ENOENT);
1090 static struct l2cap_chan *bt_6lowpan_listen(void)
1092 bdaddr_t *addr = BDADDR_ANY;
1093 struct l2cap_chan *pchan;
1096 if (psm_6lowpan == 0)
1103 pchan->state = BT_LISTEN;
1104 pchan->src_type = BDADDR_LE_PUBLIC;
1106 BT_DBG("psm 0x%04x chan %p src type %d", psm_6lowpan, pchan,
1109 err = l2cap_add_psm(pchan, addr, cpu_to_le16(psm_6lowpan));
1111 l2cap_chan_put(pchan);
1112 BT_ERR("psm cannot be added err %d", err);
1119 static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
1120 struct l2cap_conn **conn)
1122 struct hci_conn *hcon;
1123 struct hci_dev *hdev;
1124 bdaddr_t *src = BDADDR_ANY;
1127 n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
1128 &addr->b[5], &addr->b[4], &addr->b[3],
1129 &addr->b[2], &addr->b[1], &addr->b[0],
1135 hdev = hci_get_route(addr, src);
1140 hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr);
1141 hci_dev_unlock(hdev);
1146 *conn = (struct l2cap_conn *)hcon->l2cap_data;
1148 BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1153 static void disconnect_all_peers(void)
1155 struct lowpan_dev *entry, *tmp_dev;
1156 struct lowpan_peer *peer, *tmp_peer, *new_peer;
1157 struct list_head peers;
1158 unsigned long flags;
1160 INIT_LIST_HEAD(&peers);
1162 /* We make a separate list of peers as the close_cb() will
1163 * modify the device peers list so it is better not to mess
1164 * with the same list at the same time.
1167 read_lock_irqsave(&devices_lock, flags);
1169 list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) {
1170 list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list) {
1171 new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1175 new_peer->chan = peer->chan;
1176 INIT_LIST_HEAD(&new_peer->list);
1178 list_add(&new_peer->list, &peers);
1182 read_unlock_irqrestore(&devices_lock, flags);
1184 list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1185 l2cap_chan_close(peer->chan, ENOENT);
1190 static int lowpan_psm_set(void *data, u64 val)
1195 if (psm == 0 || psm_6lowpan != psm)
1196 /* Disconnect existing connections if 6lowpan is
1197 * disabled (psm = 0), or if psm changes.
1199 disconnect_all_peers();
1204 l2cap_chan_close(listen_chan, 0);
1205 l2cap_chan_put(listen_chan);
1208 listen_chan = bt_6lowpan_listen();
1213 static int lowpan_psm_get(void *data, u64 *val)
1219 DEFINE_SIMPLE_ATTRIBUTE(lowpan_psm_fops, lowpan_psm_get,
1220 lowpan_psm_set, "%llu\n");
1222 static ssize_t lowpan_control_write(struct file *fp,
1223 const char __user *user_buffer,
1228 size_t buf_size = min(count, sizeof(buf) - 1);
1232 struct l2cap_conn *conn = NULL;
1234 if (copy_from_user(buf, user_buffer, buf_size))
1237 buf[buf_size] = '\0';
1239 if (memcmp(buf, "connect ", 8) == 0) {
1240 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1245 l2cap_chan_close(listen_chan, 0);
1246 l2cap_chan_put(listen_chan);
1251 struct lowpan_peer *peer;
1253 if (!is_bt_6lowpan(conn->hcon))
1256 peer = lookup_peer(conn);
1258 BT_DBG("6LoWPAN connection already exists");
1262 BT_DBG("conn %p dst %pMR type %d user %d", conn,
1263 &conn->hcon->dst, conn->hcon->dst_type,
1267 ret = bt_6lowpan_connect(&addr, addr_type);
1274 if (memcmp(buf, "disconnect ", 11) == 0) {
1275 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1279 ret = bt_6lowpan_disconnect(conn, addr_type);
1289 static int lowpan_control_show(struct seq_file *f, void *ptr)
1291 struct lowpan_dev *entry, *tmp_dev;
1292 struct lowpan_peer *peer, *tmp_peer;
1293 unsigned long flags;
1295 read_lock_irqsave(&devices_lock, flags);
1297 list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) {
1298 list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list)
1299 seq_printf(f, "%pMR (type %u)\n",
1300 &peer->chan->dst, peer->chan->dst_type);
1303 read_unlock_irqrestore(&devices_lock, flags);
1308 static int lowpan_control_open(struct inode *inode, struct file *file)
1310 return single_open(file, lowpan_control_show, inode->i_private);
1313 static const struct file_operations lowpan_control_fops = {
1314 .open = lowpan_control_open,
1316 .write = lowpan_control_write,
1317 .llseek = seq_lseek,
1318 .release = single_release,
1321 static void disconnect_devices(void)
1323 struct lowpan_dev *entry, *tmp, *new_dev;
1324 struct list_head devices;
1325 unsigned long flags;
1327 INIT_LIST_HEAD(&devices);
1329 /* We make a separate list of devices because the unregister_netdev()
1330 * will call device_event() which will also want to modify the same
1334 read_lock_irqsave(&devices_lock, flags);
1336 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
1337 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1341 new_dev->netdev = entry->netdev;
1342 INIT_LIST_HEAD(&new_dev->list);
1344 list_add(&new_dev->list, &devices);
1347 read_unlock_irqrestore(&devices_lock, flags);
1349 list_for_each_entry_safe(entry, tmp, &devices, list) {
1350 ifdown(entry->netdev);
1351 BT_DBG("Unregistering netdev %s %p",
1352 entry->netdev->name, entry->netdev);
1353 unregister_netdev(entry->netdev);
1358 static int device_event(struct notifier_block *unused,
1359 unsigned long event, void *ptr)
1361 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1362 struct lowpan_dev *entry, *tmp;
1363 unsigned long flags;
1365 if (netdev->type != ARPHRD_6LOWPAN)
1369 case NETDEV_UNREGISTER:
1370 write_lock_irqsave(&devices_lock, flags);
1371 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices,
1373 if (entry->netdev == netdev) {
1374 BT_DBG("Unregistered netdev %s %p",
1375 netdev->name, netdev);
1376 list_del(&entry->list);
1381 write_unlock_irqrestore(&devices_lock, flags);
1388 static struct notifier_block bt_6lowpan_dev_notifier = {
1389 .notifier_call = device_event,
1392 static int __init bt_6lowpan_init(void)
1394 lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644,
1397 lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1399 &lowpan_control_fops);
1401 return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1404 static void __exit bt_6lowpan_exit(void)
1406 debugfs_remove(lowpan_psm_debugfs);
1407 debugfs_remove(lowpan_control_debugfs);
1410 l2cap_chan_close(listen_chan, 0);
1411 l2cap_chan_put(listen_chan);
1414 disconnect_devices();
1416 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1419 module_init(bt_6lowpan_init);
1420 module_exit(bt_6lowpan_exit);
1422 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1423 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1424 MODULE_VERSION(VERSION);
1425 MODULE_LICENSE("GPL");