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;
60 static DEFINE_MUTEX(set_lock);
63 struct list_head list;
65 struct l2cap_chan *chan;
67 /* peer addresses in various formats */
68 unsigned char eui64_addr[EUI64_ADDR_LEN];
69 struct in6_addr peer_addr;
72 struct lowpan_btle_dev {
73 struct list_head list;
76 struct net_device *netdev;
77 struct list_head peers;
78 atomic_t peer_count; /* number of items in peers list */
80 struct work_struct delete_netdev;
81 struct delayed_work notify_peers;
84 static inline struct lowpan_btle_dev *
85 lowpan_btle_dev(const struct net_device *netdev)
87 return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv;
90 static inline void peer_add(struct lowpan_btle_dev *dev,
91 struct lowpan_peer *peer)
93 list_add_rcu(&peer->list, &dev->peers);
94 atomic_inc(&dev->peer_count);
97 static inline bool peer_del(struct lowpan_btle_dev *dev,
98 struct lowpan_peer *peer)
100 list_del_rcu(&peer->list);
101 kfree_rcu(peer, rcu);
103 module_put(THIS_MODULE);
105 if (atomic_dec_and_test(&dev->peer_count)) {
113 static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_btle_dev *dev,
114 bdaddr_t *ba, __u8 type)
116 struct lowpan_peer *peer;
118 BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
123 list_for_each_entry_rcu(peer, &dev->peers, list) {
124 BT_DBG("dst addr %pMR dst type %d",
125 &peer->chan->dst, peer->chan->dst_type);
127 if (bacmp(&peer->chan->dst, ba))
130 if (type == peer->chan->dst_type) {
141 static inline struct lowpan_peer *
142 __peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan)
144 struct lowpan_peer *peer;
146 list_for_each_entry_rcu(peer, &dev->peers, list) {
147 if (peer->chan == chan)
154 static inline struct lowpan_peer *
155 __peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn)
157 struct lowpan_peer *peer;
159 list_for_each_entry_rcu(peer, &dev->peers, list) {
160 if (peer->chan->conn == conn)
167 static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev,
168 struct in6_addr *daddr,
171 struct lowpan_peer *peer;
172 struct in6_addr *nexthop;
173 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
174 int count = atomic_read(&dev->peer_count);
176 BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
178 /* If we have multiple 6lowpan peers, then check where we should
179 * send the packet. If only one peer exists, then we can send the
184 peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer,
191 if (ipv6_addr_any(&lowpan_cb(skb)->gw)) {
192 /* There is neither route nor gateway,
193 * probably the destination is a direct peer.
197 /* There is a known gateway
199 nexthop = &lowpan_cb(skb)->gw;
202 nexthop = rt6_nexthop(rt, daddr);
204 /* We need to remember the address because it is needed
205 * by bt_xmit() when sending the packet. In bt_xmit(), the
206 * destination routing info is not set.
208 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
211 BT_DBG("gw %pI6c", nexthop);
215 list_for_each_entry_rcu(peer, &dev->peers, list) {
216 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
217 &peer->chan->dst, peer->chan->dst_type,
220 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
231 static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
233 struct lowpan_btle_dev *entry;
234 struct lowpan_peer *peer = NULL;
238 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
239 peer = __peer_lookup_conn(entry, conn);
249 static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn)
251 struct lowpan_btle_dev *entry;
252 struct lowpan_btle_dev *dev = NULL;
256 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
257 if (conn->hcon->hdev == entry->hdev) {
268 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
270 struct sk_buff *skb_cp;
272 skb_cp = skb_copy(skb, GFP_ATOMIC);
276 return netif_rx_ni(skb_cp);
279 static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
280 struct l2cap_chan *chan)
282 const u8 *saddr, *daddr;
283 struct lowpan_btle_dev *dev;
284 struct lowpan_peer *peer;
286 dev = lowpan_btle_dev(netdev);
289 peer = __peer_lookup_chan(dev, chan);
294 saddr = peer->eui64_addr;
295 daddr = dev->netdev->dev_addr;
297 return lowpan_header_decompress(skb, netdev, daddr, saddr);
300 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
301 struct l2cap_chan *chan)
303 struct sk_buff *local_skb;
306 if (!netif_running(dev))
309 if (dev->type != ARPHRD_6LOWPAN || !skb->len)
312 skb_reset_network_header(skb);
314 skb = skb_share_check(skb, GFP_ATOMIC);
318 /* check that it's our buffer */
319 if (lowpan_is_ipv6(*skb_network_header(skb))) {
320 /* Pull off the 1-byte of 6lowpan header. */
323 /* Copy the packet so that the IPv6 header is
326 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
327 skb_tailroom(skb), GFP_ATOMIC);
331 local_skb->protocol = htons(ETH_P_IPV6);
332 local_skb->pkt_type = PACKET_HOST;
333 local_skb->dev = dev;
335 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
337 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
338 kfree_skb(local_skb);
342 dev->stats.rx_bytes += skb->len;
343 dev->stats.rx_packets++;
345 consume_skb(local_skb);
347 } else if (lowpan_is_iphc(*skb_network_header(skb))) {
348 local_skb = skb_clone(skb, GFP_ATOMIC);
352 local_skb->dev = dev;
354 ret = iphc_decompress(local_skb, dev, chan);
356 kfree_skb(local_skb);
360 local_skb->protocol = htons(ETH_P_IPV6);
361 local_skb->pkt_type = PACKET_HOST;
363 if (give_skb_to_upper(local_skb, dev)
365 kfree_skb(local_skb);
369 dev->stats.rx_bytes += skb->len;
370 dev->stats.rx_packets++;
372 consume_skb(local_skb);
378 return NET_RX_SUCCESS;
381 dev->stats.rx_dropped++;
385 /* Packet from BT LE device */
386 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
388 struct lowpan_btle_dev *dev;
389 struct lowpan_peer *peer;
392 peer = lookup_peer(chan->conn);
396 dev = lookup_dev(chan->conn);
397 if (!dev || !dev->netdev)
400 err = recv_pkt(skb, dev->netdev, chan);
402 BT_DBG("recv pkt %d", err);
409 static u8 get_addr_type_from_eui64(u8 byte)
411 /* Is universal(0) or local(1) bit */
412 return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
415 static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
417 u8 *eui64 = ip6_daddr->s6_addr + 8;
419 addr->b[0] = eui64[7];
420 addr->b[1] = eui64[6];
421 addr->b[2] = eui64[5];
422 addr->b[3] = eui64[2];
423 addr->b[4] = eui64[1];
424 addr->b[5] = eui64[0];
427 static void convert_dest_bdaddr(struct in6_addr *ip6_daddr,
428 bdaddr_t *addr, u8 *addr_type)
430 copy_to_bdaddr(ip6_daddr, addr);
432 /* We need to toggle the U/L bit that we got from IPv6 address
433 * so that we get the proper address and type of the BD address.
437 *addr_type = get_addr_type_from_eui64(addr->b[5]);
440 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
441 bdaddr_t *peer_addr, u8 *peer_addr_type)
443 struct in6_addr ipv6_daddr;
445 struct lowpan_btle_dev *dev;
446 struct lowpan_peer *peer;
447 bdaddr_t addr, *any = BDADDR_ANY;
453 dev = lowpan_btle_dev(netdev);
455 memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr));
457 if (ipv6_addr_is_multicast(&ipv6_daddr)) {
458 lowpan_cb(skb)->chan = NULL;
462 /* Get destination BT device from skb.
463 * If there is no such peer then discard the packet.
465 convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type);
467 BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
468 addr_type, &ipv6_daddr);
470 peer = peer_lookup_ba(dev, &addr, addr_type);
472 /* The packet might be sent to 6lowpan interface
473 * because of routing (either via default route
474 * or user set route) so get peer according to
475 * the destination address.
477 peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
479 BT_DBG("no such peer %pMR found", &addr);
484 daddr = peer->eui64_addr;
486 *peer_addr_type = addr_type;
487 lowpan_cb(skb)->chan = peer->chan;
492 lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr);
494 err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
501 static int header_create(struct sk_buff *skb, struct net_device *netdev,
502 unsigned short type, const void *_daddr,
503 const void *_saddr, unsigned int len)
505 if (type != ETH_P_IPV6)
511 /* Packet to BT LE device */
512 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
513 struct net_device *netdev)
519 /* Remember the skb so that we can send EAGAIN to the caller if
520 * we run out of credits.
524 iv.iov_base = skb->data;
525 iv.iov_len = skb->len;
527 memset(&msg, 0, sizeof(msg));
528 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len);
530 err = l2cap_chan_send(chan, &msg, skb->len);
532 netdev->stats.tx_bytes += err;
533 netdev->stats.tx_packets++;
538 err = lowpan_cb(skb)->status;
542 netdev->stats.tx_dropped++;
544 netdev->stats.tx_errors++;
550 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
552 struct sk_buff *local_skb;
553 struct lowpan_btle_dev *entry;
558 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
559 struct lowpan_peer *pentry;
560 struct lowpan_btle_dev *dev;
562 if (entry->netdev != netdev)
565 dev = lowpan_btle_dev(entry->netdev);
567 list_for_each_entry_rcu(pentry, &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);
589 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
595 /* We must take a copy of the skb before we modify/replace the ipv6
596 * header as the header could be used elsewhere
598 skb = skb_unshare(skb, GFP_ATOMIC);
600 return NET_XMIT_DROP;
602 /* Return values from setup_header()
603 * <0 - error, packet is dropped
604 * 0 - this is a multicast packet
605 * 1 - this is unicast packet
607 err = setup_header(skb, netdev, &addr, &addr_type);
610 return NET_XMIT_DROP;
614 if (lowpan_cb(skb)->chan) {
615 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
616 netdev->name, &addr, addr_type,
617 &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
618 err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
623 /* We need to send the packet to every device behind this
626 err = send_mcast_pkt(skb, netdev);
632 BT_DBG("ERROR: xmit failed (%d)", err);
634 return err < 0 ? NET_XMIT_DROP : err;
637 static int bt_dev_init(struct net_device *dev)
639 netdev_lockdep_set_classes(dev);
644 static const struct net_device_ops netdev_ops = {
645 .ndo_init = bt_dev_init,
646 .ndo_start_xmit = bt_xmit,
649 static struct header_ops header_ops = {
650 .create = header_create,
653 static void netdev_setup(struct net_device *dev)
655 dev->hard_header_len = 0;
656 dev->needed_tailroom = 0;
657 dev->flags = IFF_RUNNING | IFF_POINTOPOINT |
659 dev->watchdog_timeo = 0;
661 dev->netdev_ops = &netdev_ops;
662 dev->header_ops = &header_ops;
663 dev->destructor = free_netdev;
666 static struct device_type bt_type = {
670 static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
672 /* addr is the BT address in little-endian format */
682 /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
683 if (addr_type == BDADDR_LE_PUBLIC)
688 BT_DBG("type %d addr %*phC", addr_type, 8, eui);
691 static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr,
694 netdev->addr_assign_type = NET_ADDR_PERM;
695 set_addr(netdev->dev_addr, addr->b, addr_type);
698 static void ifup(struct net_device *netdev)
703 err = dev_open(netdev);
705 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
709 static void ifdown(struct net_device *netdev)
714 err = dev_close(netdev);
716 BT_INFO("iface %s cannot be closed (%d)", netdev->name, err);
720 static void do_notify_peers(struct work_struct *work)
722 struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev,
725 netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
728 static bool is_bt_6lowpan(struct hci_conn *hcon)
730 if (hcon->type != LE_LINK)
739 static struct l2cap_chan *chan_create(void)
741 struct l2cap_chan *chan;
743 chan = l2cap_chan_create();
747 l2cap_chan_set_defaults(chan);
749 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
750 chan->mode = L2CAP_MODE_LE_FLOWCTL;
756 static void set_ip_addr_bits(u8 addr_type, u8 *addr)
758 if (addr_type == BDADDR_LE_PUBLIC)
764 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
765 struct lowpan_btle_dev *dev,
768 struct lowpan_peer *peer;
770 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
775 memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
778 peer->peer_addr.s6_addr[0] = 0xFE;
779 peer->peer_addr.s6_addr[1] = 0x80;
780 set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b,
783 memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
786 /* IPv6 address needs to have the U/L bit set properly so toggle
789 set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8);
791 spin_lock(&devices_lock);
792 INIT_LIST_HEAD(&peer->list);
794 spin_unlock(&devices_lock);
796 /* Notifying peers about us needs to be done without locks held */
798 INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
799 schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
804 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
806 struct net_device *netdev;
809 netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
810 IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
815 set_dev_addr(netdev, &chan->src, chan->src_type);
817 netdev->netdev_ops = &netdev_ops;
818 SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
819 SET_NETDEV_DEVTYPE(netdev, &bt_type);
821 *dev = lowpan_btle_dev(netdev);
822 (*dev)->netdev = netdev;
823 (*dev)->hdev = chan->conn->hcon->hdev;
824 INIT_LIST_HEAD(&(*dev)->peers);
826 spin_lock(&devices_lock);
827 INIT_LIST_HEAD(&(*dev)->list);
828 list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
829 spin_unlock(&devices_lock);
831 err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE);
833 BT_INFO("register_netdev failed %d", err);
834 spin_lock(&devices_lock);
835 list_del_rcu(&(*dev)->list);
836 spin_unlock(&devices_lock);
841 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
842 netdev->ifindex, &chan->dst, chan->dst_type,
843 &chan->src, chan->src_type);
844 set_bit(__LINK_STATE_PRESENT, &netdev->state);
852 static inline void chan_ready_cb(struct l2cap_chan *chan)
854 struct lowpan_btle_dev *dev;
855 bool new_netdev = false;
857 dev = lookup_dev(chan->conn);
859 BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
862 if (setup_netdev(chan, &dev) < 0) {
863 l2cap_chan_del(chan, -ENOENT);
869 if (!try_module_get(THIS_MODULE))
872 add_peer_chan(chan, dev, new_netdev);
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_btle_dev *entry = container_of(work,
894 struct lowpan_btle_dev,
897 lowpan_unregister_netdev(entry->netdev);
899 /* The entry pointer is deleted by the netdev destructor. */
902 static void chan_close_cb(struct l2cap_chan *chan)
904 struct lowpan_btle_dev *entry;
905 struct lowpan_btle_dev *dev = NULL;
906 struct lowpan_peer *peer;
908 bool last = false, remove = true;
910 BT_DBG("chan %p conn %p", chan, chan->conn);
912 if (chan->conn && chan->conn->hcon) {
913 if (!is_bt_6lowpan(chan->conn->hcon))
916 /* If conn is set, then the netdev is also there and we should
922 spin_lock(&devices_lock);
924 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
925 dev = lowpan_btle_dev(entry->netdev);
926 peer = __peer_lookup_chan(dev, chan);
928 last = peer_del(dev, peer);
931 BT_DBG("dev %p removing %speer %p", dev,
932 last ? "last " : "1 ", peer);
933 BT_DBG("chan %p orig refcnt %d", chan,
934 atomic_read(&chan->kref.refcount));
936 l2cap_chan_put(chan);
941 if (!err && last && dev && !atomic_read(&dev->peer_count)) {
942 spin_unlock(&devices_lock);
944 cancel_delayed_work_sync(&dev->notify_peers);
949 INIT_WORK(&entry->delete_netdev, delete_netdev);
950 schedule_work(&entry->delete_netdev);
953 spin_unlock(&devices_lock);
959 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
961 BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
962 state_to_string(state), err);
965 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
966 unsigned long hdr_len,
967 unsigned long len, int nb)
969 /* Note that we must allocate using GFP_ATOMIC here as
970 * this function is called originally from netdev hard xmit
971 * function in atomic context.
973 return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
976 static void chan_suspend_cb(struct l2cap_chan *chan)
978 struct sk_buff *skb = chan->data;
980 BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
985 lowpan_cb(skb)->status = -EAGAIN;
988 static void chan_resume_cb(struct l2cap_chan *chan)
990 struct sk_buff *skb = chan->data;
992 BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
997 lowpan_cb(skb)->status = 0;
1000 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
1002 return L2CAP_CONN_TIMEOUT;
1005 static const struct l2cap_ops bt_6lowpan_chan_ops = {
1006 .name = "L2CAP 6LoWPAN channel",
1007 .new_connection = chan_new_conn_cb,
1008 .recv = chan_recv_cb,
1009 .close = chan_close_cb,
1010 .state_change = chan_state_change_cb,
1011 .ready = chan_ready_cb,
1012 .resume = chan_resume_cb,
1013 .suspend = chan_suspend_cb,
1014 .get_sndtimeo = chan_get_sndtimeo_cb,
1015 .alloc_skb = chan_alloc_skb_cb,
1017 .teardown = l2cap_chan_no_teardown,
1018 .defer = l2cap_chan_no_defer,
1019 .set_shutdown = l2cap_chan_no_set_shutdown,
1022 static inline __u8 bdaddr_type(__u8 type)
1024 if (type == ADDR_LE_DEV_PUBLIC)
1025 return BDADDR_LE_PUBLIC;
1027 return BDADDR_LE_RANDOM;
1030 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
1032 struct l2cap_chan *chan;
1035 chan = chan_create();
1039 chan->ops = &bt_6lowpan_chan_ops;
1041 err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
1044 BT_DBG("chan %p err %d", chan, err);
1046 l2cap_chan_put(chan);
1051 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
1053 struct lowpan_peer *peer;
1055 BT_DBG("conn %p dst type %d", conn, dst_type);
1057 peer = lookup_peer(conn);
1061 BT_DBG("peer %p chan %p", peer, peer->chan);
1063 l2cap_chan_close(peer->chan, ENOENT);
1068 static struct l2cap_chan *bt_6lowpan_listen(void)
1070 bdaddr_t *addr = BDADDR_ANY;
1071 struct l2cap_chan *chan;
1074 if (!enable_6lowpan)
1077 chan = chan_create();
1081 chan->ops = &bt_6lowpan_chan_ops;
1082 chan->state = BT_LISTEN;
1083 chan->src_type = BDADDR_LE_PUBLIC;
1085 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
1087 BT_DBG("chan %p src type %d", chan, chan->src_type);
1089 err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
1091 l2cap_chan_put(chan);
1092 BT_ERR("psm cannot be added err %d", err);
1099 static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
1100 struct l2cap_conn **conn)
1102 struct hci_conn *hcon;
1103 struct hci_dev *hdev;
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 /* The LE_PUBLIC address type is ignored because of BDADDR_ANY */
1115 hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC);
1120 hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type);
1121 hci_dev_unlock(hdev);
1126 *conn = (struct l2cap_conn *)hcon->l2cap_data;
1128 BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1133 static void disconnect_all_peers(void)
1135 struct lowpan_btle_dev *entry;
1136 struct lowpan_peer *peer, *tmp_peer, *new_peer;
1137 struct list_head peers;
1139 INIT_LIST_HEAD(&peers);
1141 /* We make a separate list of peers as the close_cb() will
1142 * modify the device peers list so it is better not to mess
1143 * with the same list at the same time.
1148 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1149 list_for_each_entry_rcu(peer, &entry->peers, list) {
1150 new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1154 new_peer->chan = peer->chan;
1155 INIT_LIST_HEAD(&new_peer->list);
1157 list_add(&new_peer->list, &peers);
1163 spin_lock(&devices_lock);
1164 list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1165 l2cap_chan_close(peer->chan, ENOENT);
1167 list_del_rcu(&peer->list);
1168 kfree_rcu(peer, rcu);
1170 spin_unlock(&devices_lock);
1174 struct work_struct work;
1178 static void do_enable_set(struct work_struct *work)
1180 struct set_enable *set_enable = container_of(work,
1181 struct set_enable, work);
1183 if (!set_enable->flag || enable_6lowpan != set_enable->flag)
1184 /* Disconnect existing connections if 6lowpan is
1187 disconnect_all_peers();
1189 enable_6lowpan = set_enable->flag;
1191 mutex_lock(&set_lock);
1193 l2cap_chan_close(listen_chan, 0);
1194 l2cap_chan_put(listen_chan);
1197 listen_chan = bt_6lowpan_listen();
1198 mutex_unlock(&set_lock);
1203 static int lowpan_enable_set(void *data, u64 val)
1205 struct set_enable *set_enable;
1207 set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
1211 set_enable->flag = !!val;
1212 INIT_WORK(&set_enable->work, do_enable_set);
1214 schedule_work(&set_enable->work);
1219 static int lowpan_enable_get(void *data, u64 *val)
1221 *val = enable_6lowpan;
1225 DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
1226 lowpan_enable_set, "%llu\n");
1228 static ssize_t lowpan_control_write(struct file *fp,
1229 const char __user *user_buffer,
1234 size_t buf_size = min(count, sizeof(buf) - 1);
1238 struct l2cap_conn *conn = NULL;
1240 if (copy_from_user(buf, user_buffer, buf_size))
1243 buf[buf_size] = '\0';
1245 if (memcmp(buf, "connect ", 8) == 0) {
1246 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1250 mutex_lock(&set_lock);
1252 l2cap_chan_close(listen_chan, 0);
1253 l2cap_chan_put(listen_chan);
1256 mutex_unlock(&set_lock);
1259 struct lowpan_peer *peer;
1261 if (!is_bt_6lowpan(conn->hcon))
1264 peer = lookup_peer(conn);
1266 BT_DBG("6LoWPAN connection already exists");
1270 BT_DBG("conn %p dst %pMR type %d user %d", conn,
1271 &conn->hcon->dst, conn->hcon->dst_type,
1275 ret = bt_6lowpan_connect(&addr, addr_type);
1282 if (memcmp(buf, "disconnect ", 11) == 0) {
1283 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1287 ret = bt_6lowpan_disconnect(conn, addr_type);
1297 static int lowpan_control_show(struct seq_file *f, void *ptr)
1299 struct lowpan_btle_dev *entry;
1300 struct lowpan_peer *peer;
1302 spin_lock(&devices_lock);
1304 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1305 list_for_each_entry(peer, &entry->peers, list)
1306 seq_printf(f, "%pMR (type %u)\n",
1307 &peer->chan->dst, peer->chan->dst_type);
1310 spin_unlock(&devices_lock);
1315 static int lowpan_control_open(struct inode *inode, struct file *file)
1317 return single_open(file, lowpan_control_show, inode->i_private);
1320 static const struct file_operations lowpan_control_fops = {
1321 .open = lowpan_control_open,
1323 .write = lowpan_control_write,
1324 .llseek = seq_lseek,
1325 .release = single_release,
1328 static void disconnect_devices(void)
1330 struct lowpan_btle_dev *entry, *tmp, *new_dev;
1331 struct list_head devices;
1333 INIT_LIST_HEAD(&devices);
1335 /* We make a separate list of devices because the unregister_netdev()
1336 * will call device_event() which will also want to modify the same
1342 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1343 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1347 new_dev->netdev = entry->netdev;
1348 INIT_LIST_HEAD(&new_dev->list);
1350 list_add_rcu(&new_dev->list, &devices);
1355 list_for_each_entry_safe(entry, tmp, &devices, list) {
1356 ifdown(entry->netdev);
1357 BT_DBG("Unregistering netdev %s %p",
1358 entry->netdev->name, entry->netdev);
1359 lowpan_unregister_netdev(entry->netdev);
1364 static int device_event(struct notifier_block *unused,
1365 unsigned long event, void *ptr)
1367 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1368 struct lowpan_btle_dev *entry;
1370 if (netdev->type != ARPHRD_6LOWPAN)
1374 case NETDEV_UNREGISTER:
1375 spin_lock(&devices_lock);
1376 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1377 if (entry->netdev == netdev) {
1378 BT_DBG("Unregistered netdev %s %p",
1379 netdev->name, netdev);
1380 list_del(&entry->list);
1384 spin_unlock(&devices_lock);
1391 static struct notifier_block bt_6lowpan_dev_notifier = {
1392 .notifier_call = device_event,
1395 static int __init bt_6lowpan_init(void)
1397 lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644,
1399 &lowpan_enable_fops);
1400 lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1402 &lowpan_control_fops);
1404 return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1407 static void __exit bt_6lowpan_exit(void)
1409 debugfs_remove(lowpan_enable_debugfs);
1410 debugfs_remove(lowpan_control_debugfs);
1413 l2cap_chan_close(listen_chan, 0);
1414 l2cap_chan_put(listen_chan);
1417 disconnect_devices();
1419 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1422 module_init(bt_6lowpan_init);
1423 module_exit(bt_6lowpan_exit);
1425 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1426 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1427 MODULE_VERSION(VERSION);
1428 MODULE_LICENSE("GPL");