Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1 | /* |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 2 | Copyright (c) 2013-2014 Intel Corp. |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 3 | |
| 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. |
| 7 | |
| 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. |
| 12 | */ |
| 13 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 14 | #include <linux/if_arp.h> |
| 15 | #include <linux/netdevice.h> |
| 16 | #include <linux/etherdevice.h> |
Jukka Rissanen | 5547e48 | 2014-06-18 16:37:09 +0300 | [diff] [blame] | 17 | #include <linux/module.h> |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 18 | #include <linux/debugfs.h> |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 19 | |
| 20 | #include <net/ipv6.h> |
| 21 | #include <net/ip6_route.h> |
| 22 | #include <net/addrconf.h> |
| 23 | |
| 24 | #include <net/af_ieee802154.h> /* to get the address type */ |
| 25 | |
| 26 | #include <net/bluetooth/bluetooth.h> |
| 27 | #include <net/bluetooth/hci_core.h> |
| 28 | #include <net/bluetooth/l2cap.h> |
| 29 | |
Alexander Aring | cefc8c8 | 2014-03-05 14:29:05 +0100 | [diff] [blame] | 30 | #include <net/6lowpan.h> /* for the compression support */ |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 31 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 32 | #define VERSION "0.1" |
| 33 | |
| 34 | static struct dentry *lowpan_psm_debugfs; |
| 35 | static struct dentry *lowpan_control_debugfs; |
| 36 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 37 | #define IFACE_NAME_TEMPLATE "bt%d" |
| 38 | #define EUI64_ADDR_LEN 8 |
| 39 | |
| 40 | struct skb_cb { |
| 41 | struct in6_addr addr; |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 42 | struct in6_addr gw; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 43 | struct l2cap_chan *chan; |
| 44 | int status; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 45 | }; |
| 46 | #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb)) |
| 47 | |
| 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. |
| 54 | */ |
| 55 | static LIST_HEAD(bt_6lowpan_devices); |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 56 | static DEFINE_SPINLOCK(devices_lock); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 57 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 58 | /* If psm is set to 0 (default value), then 6lowpan is disabled. |
| 59 | * Other values are used to indicate a Protocol Service Multiplexer |
| 60 | * value for 6lowpan. |
| 61 | */ |
| 62 | static u16 psm_6lowpan; |
| 63 | |
| 64 | /* We are listening incoming connections via this channel |
| 65 | */ |
| 66 | static struct l2cap_chan *listen_chan; |
| 67 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 68 | struct lowpan_peer { |
| 69 | struct list_head list; |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 70 | struct rcu_head rcu; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 71 | struct l2cap_chan *chan; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 72 | |
| 73 | /* peer addresses in various formats */ |
| 74 | unsigned char eui64_addr[EUI64_ADDR_LEN]; |
| 75 | struct in6_addr peer_addr; |
| 76 | }; |
| 77 | |
| 78 | struct lowpan_dev { |
| 79 | struct list_head list; |
| 80 | |
| 81 | struct hci_dev *hdev; |
| 82 | struct net_device *netdev; |
| 83 | struct list_head peers; |
| 84 | atomic_t peer_count; /* number of items in peers list */ |
| 85 | |
| 86 | struct work_struct delete_netdev; |
| 87 | struct delayed_work notify_peers; |
| 88 | }; |
| 89 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 90 | static inline void peer_free(struct rcu_head *head) |
| 91 | { |
| 92 | struct lowpan_peer *e = container_of(head, struct lowpan_peer, rcu); |
| 93 | |
| 94 | kfree(e); |
| 95 | } |
| 96 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 97 | static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev) |
| 98 | { |
| 99 | return netdev_priv(netdev); |
| 100 | } |
| 101 | |
| 102 | static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer) |
| 103 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 104 | list_add_rcu(&peer->list, &dev->peers); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 105 | atomic_inc(&dev->peer_count); |
| 106 | } |
| 107 | |
| 108 | static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer) |
| 109 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 110 | list_del_rcu(&peer->list); |
| 111 | call_rcu(&peer->rcu, peer_free); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 112 | |
Jukka Rissanen | 18d93c1 | 2014-06-18 16:37:10 +0300 | [diff] [blame] | 113 | module_put(THIS_MODULE); |
| 114 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 115 | if (atomic_dec_and_test(&dev->peer_count)) { |
| 116 | BT_DBG("last peer"); |
| 117 | return true; |
| 118 | } |
| 119 | |
| 120 | return false; |
| 121 | } |
| 122 | |
| 123 | static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev, |
| 124 | bdaddr_t *ba, __u8 type) |
| 125 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 126 | struct lowpan_peer *peer; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 127 | |
| 128 | BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count), |
| 129 | ba, type); |
| 130 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 131 | rcu_read_lock(); |
| 132 | |
| 133 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 134 | BT_DBG("dst addr %pMR dst type %d", |
| 135 | &peer->chan->dst, peer->chan->dst_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 136 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 137 | if (bacmp(&peer->chan->dst, ba)) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 138 | continue; |
| 139 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 140 | if (type == peer->chan->dst_type) { |
| 141 | rcu_read_unlock(); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 142 | return peer; |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 143 | } |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 144 | } |
| 145 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 146 | rcu_read_unlock(); |
| 147 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 148 | return NULL; |
| 149 | } |
| 150 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 151 | static inline struct lowpan_peer *__peer_lookup_chan(struct lowpan_dev *dev, |
| 152 | struct l2cap_chan *chan) |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 153 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 154 | struct lowpan_peer *peer; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 155 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 156 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 157 | if (peer->chan == chan) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 158 | return peer; |
| 159 | } |
| 160 | |
| 161 | return NULL; |
| 162 | } |
| 163 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 164 | static inline struct lowpan_peer *__peer_lookup_conn(struct lowpan_dev *dev, |
| 165 | struct l2cap_conn *conn) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 166 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 167 | struct lowpan_peer *peer; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 168 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 169 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 170 | if (peer->chan->conn == conn) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 171 | return peer; |
| 172 | } |
| 173 | |
| 174 | return NULL; |
| 175 | } |
| 176 | |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 177 | static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev, |
| 178 | struct in6_addr *daddr, |
| 179 | struct sk_buff *skb) |
| 180 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 181 | struct lowpan_peer *peer; |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 182 | struct in6_addr *nexthop; |
| 183 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
| 184 | int count = atomic_read(&dev->peer_count); |
| 185 | |
| 186 | BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt); |
| 187 | |
| 188 | /* If we have multiple 6lowpan peers, then check where we should |
| 189 | * send the packet. If only one peer exists, then we can send the |
| 190 | * packet right away. |
| 191 | */ |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 192 | if (count == 1) { |
| 193 | rcu_read_lock(); |
| 194 | peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer, |
| 195 | list); |
| 196 | rcu_read_unlock(); |
| 197 | return peer; |
| 198 | } |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 199 | |
| 200 | if (!rt) { |
| 201 | nexthop = &lowpan_cb(skb)->gw; |
| 202 | |
| 203 | if (ipv6_addr_any(nexthop)) |
| 204 | return NULL; |
| 205 | } else { |
| 206 | nexthop = rt6_nexthop(rt); |
| 207 | |
| 208 | /* We need to remember the address because it is needed |
| 209 | * by bt_xmit() when sending the packet. In bt_xmit(), the |
| 210 | * destination routing info is not set. |
| 211 | */ |
| 212 | memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr)); |
| 213 | } |
| 214 | |
| 215 | BT_DBG("gw %pI6c", nexthop); |
| 216 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 217 | rcu_read_lock(); |
| 218 | |
| 219 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 220 | BT_DBG("dst addr %pMR dst type %d ip %pI6c", |
| 221 | &peer->chan->dst, peer->chan->dst_type, |
| 222 | &peer->peer_addr); |
| 223 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 224 | if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) { |
| 225 | rcu_read_unlock(); |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 226 | return peer; |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 227 | } |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 228 | } |
| 229 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 230 | rcu_read_unlock(); |
| 231 | |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 232 | return NULL; |
| 233 | } |
| 234 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 235 | static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) |
| 236 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 237 | struct lowpan_dev *entry; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 238 | struct lowpan_peer *peer = NULL; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 239 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 240 | rcu_read_lock(); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 241 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 242 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
| 243 | peer = __peer_lookup_conn(entry, conn); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 244 | if (peer) |
| 245 | break; |
| 246 | } |
| 247 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 248 | rcu_read_unlock(); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 249 | |
| 250 | return peer; |
| 251 | } |
| 252 | |
| 253 | static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn) |
| 254 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 255 | struct lowpan_dev *entry; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 256 | struct lowpan_dev *dev = NULL; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 257 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 258 | rcu_read_lock(); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 259 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 260 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 261 | if (conn->hcon->hdev == entry->hdev) { |
| 262 | dev = entry; |
| 263 | break; |
| 264 | } |
| 265 | } |
| 266 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 267 | rcu_read_unlock(); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 268 | |
| 269 | return dev; |
| 270 | } |
| 271 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 272 | static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
| 273 | { |
| 274 | struct sk_buff *skb_cp; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 275 | |
| 276 | skb_cp = skb_copy(skb, GFP_ATOMIC); |
| 277 | if (!skb_cp) |
Martin Townsend | f8b3617 | 2014-10-23 15:40:53 +0100 | [diff] [blame] | 278 | return NET_RX_DROP; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 279 | |
Li RongQing | 4456c50 | 2014-10-16 10:21:55 +0800 | [diff] [blame] | 280 | return netif_rx(skb_cp); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 281 | } |
| 282 | |
Martin Townsend | 0114123 | 2014-10-23 15:40:56 +0100 | [diff] [blame] | 283 | static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev, |
| 284 | struct l2cap_chan *chan) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 285 | { |
| 286 | const u8 *saddr, *daddr; |
| 287 | u8 iphc0, iphc1; |
| 288 | struct lowpan_dev *dev; |
| 289 | struct lowpan_peer *peer; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 290 | |
| 291 | dev = lowpan_dev(netdev); |
| 292 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 293 | rcu_read_lock(); |
| 294 | peer = __peer_lookup_chan(dev, chan); |
| 295 | rcu_read_unlock(); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 296 | if (!peer) |
Martin Townsend | 56b2c3e | 2014-11-06 19:15:13 +0000 | [diff] [blame] | 297 | return -EINVAL; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 298 | |
| 299 | saddr = peer->eui64_addr; |
| 300 | daddr = dev->netdev->dev_addr; |
| 301 | |
| 302 | /* at least two bytes will be used for the encoding */ |
| 303 | if (skb->len < 2) |
Martin Townsend | 56b2c3e | 2014-11-06 19:15:13 +0000 | [diff] [blame] | 304 | return -EINVAL; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 305 | |
| 306 | if (lowpan_fetch_skb_u8(skb, &iphc0)) |
Martin Townsend | 56b2c3e | 2014-11-06 19:15:13 +0000 | [diff] [blame] | 307 | return -EINVAL; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 308 | |
| 309 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
Martin Townsend | 56b2c3e | 2014-11-06 19:15:13 +0000 | [diff] [blame] | 310 | return -EINVAL; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 311 | |
Martin Townsend | 0114123 | 2014-10-23 15:40:56 +0100 | [diff] [blame] | 312 | return lowpan_header_decompress(skb, netdev, |
| 313 | saddr, IEEE802154_ADDR_LONG, |
| 314 | EUI64_ADDR_LEN, daddr, |
| 315 | IEEE802154_ADDR_LONG, EUI64_ADDR_LEN, |
| 316 | iphc0, iphc1); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 317 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 321 | struct l2cap_chan *chan) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 322 | { |
| 323 | struct sk_buff *local_skb; |
| 324 | int ret; |
| 325 | |
| 326 | if (!netif_running(dev)) |
| 327 | goto drop; |
| 328 | |
| 329 | if (dev->type != ARPHRD_6LOWPAN) |
| 330 | goto drop; |
| 331 | |
Martin Townsend | 11e3ff7 | 2014-10-13 11:00:56 +0100 | [diff] [blame] | 332 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 333 | if (!skb) |
| 334 | goto drop; |
| 335 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 336 | /* check that it's our buffer */ |
| 337 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { |
| 338 | /* Copy the packet so that the IPv6 header is |
| 339 | * properly aligned. |
| 340 | */ |
| 341 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, |
| 342 | skb_tailroom(skb), GFP_ATOMIC); |
| 343 | if (!local_skb) |
| 344 | goto drop; |
| 345 | |
| 346 | local_skb->protocol = htons(ETH_P_IPV6); |
| 347 | local_skb->pkt_type = PACKET_HOST; |
| 348 | |
| 349 | skb_reset_network_header(local_skb); |
| 350 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); |
| 351 | |
| 352 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { |
| 353 | kfree_skb(local_skb); |
| 354 | goto drop; |
| 355 | } |
| 356 | |
| 357 | dev->stats.rx_bytes += skb->len; |
| 358 | dev->stats.rx_packets++; |
| 359 | |
Martin Townsend | 3c400b8 | 2014-10-23 15:40:55 +0100 | [diff] [blame] | 360 | consume_skb(local_skb); |
| 361 | consume_skb(skb); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 362 | } else { |
| 363 | switch (skb->data[0] & 0xe0) { |
| 364 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ |
| 365 | local_skb = skb_clone(skb, GFP_ATOMIC); |
| 366 | if (!local_skb) |
| 367 | goto drop; |
| 368 | |
Martin Townsend | 0114123 | 2014-10-23 15:40:56 +0100 | [diff] [blame] | 369 | ret = iphc_decompress(local_skb, dev, chan); |
Martin Townsend | 56b2c3e | 2014-11-06 19:15:13 +0000 | [diff] [blame] | 370 | if (ret < 0) { |
| 371 | kfree_skb(local_skb); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 372 | goto drop; |
Martin Townsend | 56b2c3e | 2014-11-06 19:15:13 +0000 | [diff] [blame] | 373 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 374 | |
Martin Townsend | f8b3617 | 2014-10-23 15:40:53 +0100 | [diff] [blame] | 375 | local_skb->protocol = htons(ETH_P_IPV6); |
| 376 | local_skb->pkt_type = PACKET_HOST; |
| 377 | local_skb->dev = dev; |
| 378 | |
| 379 | if (give_skb_to_upper(local_skb, dev) |
| 380 | != NET_RX_SUCCESS) { |
| 381 | kfree_skb(local_skb); |
| 382 | goto drop; |
| 383 | } |
| 384 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 385 | dev->stats.rx_bytes += skb->len; |
| 386 | dev->stats.rx_packets++; |
| 387 | |
Martin Townsend | 3c400b8 | 2014-10-23 15:40:55 +0100 | [diff] [blame] | 388 | consume_skb(local_skb); |
| 389 | consume_skb(skb); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 390 | break; |
| 391 | default: |
| 392 | break; |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | return NET_RX_SUCCESS; |
| 397 | |
| 398 | drop: |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 399 | dev->stats.rx_dropped++; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 400 | kfree_skb(skb); |
| 401 | return NET_RX_DROP; |
| 402 | } |
| 403 | |
| 404 | /* Packet from BT LE device */ |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 405 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 406 | { |
| 407 | struct lowpan_dev *dev; |
| 408 | struct lowpan_peer *peer; |
| 409 | int err; |
| 410 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 411 | peer = lookup_peer(chan->conn); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 412 | if (!peer) |
| 413 | return -ENOENT; |
| 414 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 415 | dev = lookup_dev(chan->conn); |
Johan Hedberg | 30d3db4 | 2013-12-12 09:53:21 +0200 | [diff] [blame] | 416 | if (!dev || !dev->netdev) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 417 | return -ENOENT; |
| 418 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 419 | err = recv_pkt(skb, dev->netdev, chan); |
| 420 | if (err) { |
| 421 | BT_DBG("recv pkt %d", err); |
| 422 | err = -EAGAIN; |
| 423 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 424 | |
| 425 | return err; |
| 426 | } |
| 427 | |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 428 | static u8 get_addr_type_from_eui64(u8 byte) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 429 | { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 430 | /* Is universal(0) or local(1) bit */ |
| 431 | return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC); |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 432 | } |
| 433 | |
| 434 | static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr) |
| 435 | { |
| 436 | u8 *eui64 = ip6_daddr->s6_addr + 8; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 437 | |
| 438 | addr->b[0] = eui64[7]; |
| 439 | addr->b[1] = eui64[6]; |
| 440 | addr->b[2] = eui64[5]; |
| 441 | addr->b[3] = eui64[2]; |
| 442 | addr->b[4] = eui64[1]; |
| 443 | addr->b[5] = eui64[0]; |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 444 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 445 | |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 446 | static void convert_dest_bdaddr(struct in6_addr *ip6_daddr, |
| 447 | bdaddr_t *addr, u8 *addr_type) |
| 448 | { |
| 449 | copy_to_bdaddr(ip6_daddr, addr); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 450 | |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 451 | /* We need to toggle the U/L bit that we got from IPv6 address |
| 452 | * so that we get the proper address and type of the BD address. |
| 453 | */ |
| 454 | addr->b[5] ^= 0x02; |
| 455 | |
| 456 | *addr_type = get_addr_type_from_eui64(addr->b[5]); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 457 | } |
| 458 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 459 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
| 460 | bdaddr_t *peer_addr, u8 *peer_addr_type) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 461 | { |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 462 | struct in6_addr ipv6_daddr; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 463 | struct lowpan_dev *dev; |
| 464 | struct lowpan_peer *peer; |
| 465 | bdaddr_t addr, *any = BDADDR_ANY; |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 466 | u8 *daddr = any->b; |
| 467 | int err, status = 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 468 | |
| 469 | dev = lowpan_dev(netdev); |
| 470 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 471 | memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr)); |
| 472 | |
| 473 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 474 | lowpan_cb(skb)->chan = NULL; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 475 | } else { |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 476 | u8 addr_type; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 477 | |
| 478 | /* Get destination BT device from skb. |
| 479 | * If there is no such peer then discard the packet. |
| 480 | */ |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 481 | convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 482 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 483 | BT_DBG("dest addr %pMR type %d IP %pI6c", &addr, |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 484 | addr_type, &ipv6_daddr); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 485 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 486 | peer = peer_lookup_ba(dev, &addr, addr_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 487 | if (!peer) { |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 488 | /* The packet might be sent to 6lowpan interface |
| 489 | * because of routing (either via default route |
| 490 | * or user set route) so get peer according to |
| 491 | * the destination address. |
| 492 | */ |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 493 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 494 | if (!peer) { |
| 495 | BT_DBG("no such peer %pMR found", &addr); |
| 496 | return -ENOENT; |
| 497 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 498 | } |
| 499 | |
| 500 | daddr = peer->eui64_addr; |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 501 | *peer_addr = addr; |
| 502 | *peer_addr_type = addr_type; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 503 | lowpan_cb(skb)->chan = peer->chan; |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 504 | |
| 505 | status = 1; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 506 | } |
| 507 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 508 | lowpan_header_compress(skb, netdev, ETH_P_IPV6, daddr, |
| 509 | dev->netdev->dev_addr, skb->len); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 510 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 511 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); |
| 512 | if (err < 0) |
| 513 | return err; |
| 514 | |
| 515 | return status; |
| 516 | } |
| 517 | |
| 518 | static int header_create(struct sk_buff *skb, struct net_device *netdev, |
| 519 | unsigned short type, const void *_daddr, |
| 520 | const void *_saddr, unsigned int len) |
| 521 | { |
| 522 | struct ipv6hdr *hdr; |
| 523 | |
| 524 | if (type != ETH_P_IPV6) |
| 525 | return -EINVAL; |
| 526 | |
| 527 | hdr = ipv6_hdr(skb); |
| 528 | |
| 529 | memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr)); |
| 530 | |
| 531 | return 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | /* Packet to BT LE device */ |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 535 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
Jukka Rissanen | d7b6b0a | 2014-10-01 15:59:14 +0300 | [diff] [blame] | 536 | struct net_device *netdev) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 537 | { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 538 | struct msghdr msg; |
| 539 | struct kvec iv; |
| 540 | int err; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 541 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 542 | /* Remember the skb so that we can send EAGAIN to the caller if |
Jukka Rissanen | d7b6b0a | 2014-10-01 15:59:14 +0300 | [diff] [blame] | 543 | * we run out of credits. |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 544 | */ |
Jukka Rissanen | d7b6b0a | 2014-10-01 15:59:14 +0300 | [diff] [blame] | 545 | chan->data = skb; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 546 | |
| 547 | memset(&msg, 0, sizeof(msg)); |
| 548 | msg.msg_iov = (struct iovec *) &iv; |
| 549 | msg.msg_iovlen = 1; |
| 550 | iv.iov_base = skb->data; |
| 551 | iv.iov_len = skb->len; |
| 552 | |
| 553 | err = l2cap_chan_send(chan, &msg, skb->len); |
| 554 | if (err > 0) { |
| 555 | netdev->stats.tx_bytes += err; |
| 556 | netdev->stats.tx_packets++; |
| 557 | return 0; |
| 558 | } |
| 559 | |
| 560 | if (!err) |
| 561 | err = lowpan_cb(skb)->status; |
| 562 | |
| 563 | if (err < 0) { |
| 564 | if (err == -EAGAIN) |
| 565 | netdev->stats.tx_dropped++; |
| 566 | else |
| 567 | netdev->stats.tx_errors++; |
| 568 | } |
| 569 | |
| 570 | return err; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 571 | } |
| 572 | |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 573 | static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 574 | { |
| 575 | struct sk_buff *local_skb; |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 576 | struct lowpan_dev *entry; |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 577 | int err = 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 578 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 579 | rcu_read_lock(); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 580 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 581 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
| 582 | struct lowpan_peer *pentry; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 583 | struct lowpan_dev *dev; |
| 584 | |
| 585 | if (entry->netdev != netdev) |
| 586 | continue; |
| 587 | |
| 588 | dev = lowpan_dev(entry->netdev); |
| 589 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 590 | list_for_each_entry_rcu(pentry, &dev->peers, list) { |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 591 | int ret; |
| 592 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 593 | local_skb = skb_clone(skb, GFP_ATOMIC); |
| 594 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 595 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
| 596 | netdev->name, |
| 597 | &pentry->chan->dst, pentry->chan->dst_type, |
| 598 | &pentry->peer_addr, pentry->chan); |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 599 | ret = send_pkt(pentry->chan, local_skb, netdev); |
| 600 | if (ret < 0) |
| 601 | err = ret; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 602 | |
| 603 | kfree_skb(local_skb); |
| 604 | } |
| 605 | } |
| 606 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 607 | rcu_read_unlock(); |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 608 | |
| 609 | return err; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 610 | } |
| 611 | |
| 612 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) |
| 613 | { |
| 614 | int err = 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 615 | bdaddr_t addr; |
| 616 | u8 addr_type; |
| 617 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 618 | /* We must take a copy of the skb before we modify/replace the ipv6 |
| 619 | * header as the header could be used elsewhere |
| 620 | */ |
Alexander Aring | b0c42cd | 2014-10-08 10:24:53 +0200 | [diff] [blame^] | 621 | skb = skb_unshare(skb, GFP_ATOMIC); |
| 622 | if (!skb) |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 623 | return NET_XMIT_DROP; |
| 624 | |
| 625 | /* Return values from setup_header() |
| 626 | * <0 - error, packet is dropped |
| 627 | * 0 - this is a multicast packet |
| 628 | * 1 - this is unicast packet |
| 629 | */ |
| 630 | err = setup_header(skb, netdev, &addr, &addr_type); |
| 631 | if (err < 0) { |
| 632 | kfree_skb(skb); |
| 633 | return NET_XMIT_DROP; |
| 634 | } |
| 635 | |
| 636 | if (err) { |
| 637 | if (lowpan_cb(skb)->chan) { |
| 638 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
| 639 | netdev->name, &addr, addr_type, |
| 640 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); |
Jukka Rissanen | d7b6b0a | 2014-10-01 15:59:14 +0300 | [diff] [blame] | 641 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 642 | } else { |
| 643 | err = -ENOENT; |
| 644 | } |
| 645 | } else { |
| 646 | /* We need to send the packet to every device behind this |
| 647 | * interface. |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 648 | */ |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 649 | err = send_mcast_pkt(skb, netdev); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 650 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 651 | |
Jukka Rissanen | fc12518 | 2014-10-01 11:30:26 +0300 | [diff] [blame] | 652 | dev_kfree_skb(skb); |
| 653 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 654 | if (err) |
| 655 | BT_DBG("ERROR: xmit failed (%d)", err); |
| 656 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 657 | return err < 0 ? NET_XMIT_DROP : err; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 658 | } |
| 659 | |
Jukka Rissanen | df09230 | 2014-10-28 17:16:48 +0200 | [diff] [blame] | 660 | static struct lock_class_key bt_tx_busylock; |
| 661 | static struct lock_class_key bt_netdev_xmit_lock_key; |
| 662 | |
| 663 | static void bt_set_lockdep_class_one(struct net_device *dev, |
| 664 | struct netdev_queue *txq, |
| 665 | void *_unused) |
| 666 | { |
| 667 | lockdep_set_class(&txq->_xmit_lock, &bt_netdev_xmit_lock_key); |
| 668 | } |
| 669 | |
| 670 | static int bt_dev_init(struct net_device *dev) |
| 671 | { |
| 672 | netdev_for_each_tx_queue(dev, bt_set_lockdep_class_one, NULL); |
| 673 | dev->qdisc_tx_busylock = &bt_tx_busylock; |
| 674 | |
| 675 | return 0; |
| 676 | } |
| 677 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 678 | static const struct net_device_ops netdev_ops = { |
Jukka Rissanen | df09230 | 2014-10-28 17:16:48 +0200 | [diff] [blame] | 679 | .ndo_init = bt_dev_init, |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 680 | .ndo_start_xmit = bt_xmit, |
| 681 | }; |
| 682 | |
| 683 | static struct header_ops header_ops = { |
| 684 | .create = header_create, |
| 685 | }; |
| 686 | |
| 687 | static void netdev_setup(struct net_device *dev) |
| 688 | { |
| 689 | dev->addr_len = EUI64_ADDR_LEN; |
| 690 | dev->type = ARPHRD_6LOWPAN; |
| 691 | |
| 692 | dev->hard_header_len = 0; |
| 693 | dev->needed_tailroom = 0; |
| 694 | dev->mtu = IPV6_MIN_MTU; |
| 695 | dev->tx_queue_len = 0; |
Jukka Rissanen | 156395c | 2014-09-29 16:37:26 +0300 | [diff] [blame] | 696 | dev->flags = IFF_RUNNING | IFF_POINTOPOINT | |
| 697 | IFF_MULTICAST; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 698 | dev->watchdog_timeo = 0; |
| 699 | |
| 700 | dev->netdev_ops = &netdev_ops; |
| 701 | dev->header_ops = &header_ops; |
| 702 | dev->destructor = free_netdev; |
| 703 | } |
| 704 | |
| 705 | static struct device_type bt_type = { |
| 706 | .name = "bluetooth", |
| 707 | }; |
| 708 | |
| 709 | static void set_addr(u8 *eui, u8 *addr, u8 addr_type) |
| 710 | { |
| 711 | /* addr is the BT address in little-endian format */ |
| 712 | eui[0] = addr[5]; |
| 713 | eui[1] = addr[4]; |
| 714 | eui[2] = addr[3]; |
| 715 | eui[3] = 0xFF; |
| 716 | eui[4] = 0xFE; |
| 717 | eui[5] = addr[2]; |
| 718 | eui[6] = addr[1]; |
| 719 | eui[7] = addr[0]; |
| 720 | |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 721 | /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */ |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 722 | if (addr_type == BDADDR_LE_PUBLIC) |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 723 | eui[0] &= ~0x02; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 724 | else |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 725 | eui[0] |= 0x02; |
| 726 | |
| 727 | BT_DBG("type %d addr %*phC", addr_type, 8, eui); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 728 | } |
| 729 | |
| 730 | static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr, |
| 731 | u8 addr_type) |
| 732 | { |
| 733 | netdev->addr_assign_type = NET_ADDR_PERM; |
| 734 | set_addr(netdev->dev_addr, addr->b, addr_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 735 | } |
| 736 | |
| 737 | static void ifup(struct net_device *netdev) |
| 738 | { |
| 739 | int err; |
| 740 | |
| 741 | rtnl_lock(); |
| 742 | err = dev_open(netdev); |
| 743 | if (err < 0) |
| 744 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); |
| 745 | rtnl_unlock(); |
| 746 | } |
| 747 | |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 748 | static void ifdown(struct net_device *netdev) |
| 749 | { |
| 750 | int err; |
| 751 | |
| 752 | rtnl_lock(); |
| 753 | err = dev_close(netdev); |
| 754 | if (err < 0) |
| 755 | BT_INFO("iface %s cannot be closed (%d)", netdev->name, err); |
| 756 | rtnl_unlock(); |
| 757 | } |
| 758 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 759 | static void do_notify_peers(struct work_struct *work) |
| 760 | { |
| 761 | struct lowpan_dev *dev = container_of(work, struct lowpan_dev, |
| 762 | notify_peers.work); |
| 763 | |
| 764 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ |
| 765 | } |
| 766 | |
| 767 | static bool is_bt_6lowpan(struct hci_conn *hcon) |
| 768 | { |
| 769 | if (hcon->type != LE_LINK) |
| 770 | return false; |
| 771 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 772 | if (!psm_6lowpan) |
| 773 | return false; |
| 774 | |
| 775 | return true; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 776 | } |
| 777 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 778 | static struct l2cap_chan *chan_create(void) |
| 779 | { |
| 780 | struct l2cap_chan *chan; |
| 781 | |
| 782 | chan = l2cap_chan_create(); |
| 783 | if (!chan) |
| 784 | return NULL; |
| 785 | |
| 786 | l2cap_chan_set_defaults(chan); |
| 787 | |
| 788 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; |
| 789 | chan->mode = L2CAP_MODE_LE_FLOWCTL; |
| 790 | chan->omtu = 65535; |
| 791 | chan->imtu = chan->omtu; |
| 792 | |
| 793 | return chan; |
| 794 | } |
| 795 | |
| 796 | static struct l2cap_chan *chan_open(struct l2cap_chan *pchan) |
| 797 | { |
| 798 | struct l2cap_chan *chan; |
| 799 | |
| 800 | chan = chan_create(); |
| 801 | if (!chan) |
| 802 | return NULL; |
| 803 | |
| 804 | chan->remote_mps = chan->omtu; |
| 805 | chan->mps = chan->omtu; |
| 806 | |
| 807 | chan->state = BT_CONNECTED; |
| 808 | |
| 809 | return chan; |
| 810 | } |
| 811 | |
Jukka Rissanen | b2799ce | 2014-09-08 12:11:44 +0300 | [diff] [blame] | 812 | static void set_ip_addr_bits(u8 addr_type, u8 *addr) |
| 813 | { |
| 814 | if (addr_type == BDADDR_LE_PUBLIC) |
| 815 | *addr |= 0x02; |
| 816 | else |
| 817 | *addr &= ~0x02; |
| 818 | } |
| 819 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 820 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
| 821 | struct lowpan_dev *dev) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 822 | { |
| 823 | struct lowpan_peer *peer; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 824 | |
| 825 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); |
| 826 | if (!peer) |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 827 | return NULL; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 828 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 829 | peer->chan = chan; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 830 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); |
| 831 | |
| 832 | /* RFC 2464 ch. 5 */ |
| 833 | peer->peer_addr.s6_addr[0] = 0xFE; |
| 834 | peer->peer_addr.s6_addr[1] = 0x80; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 835 | set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b, |
| 836 | chan->dst_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 837 | |
| 838 | memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8, |
| 839 | EUI64_ADDR_LEN); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 840 | |
Jukka Rissanen | b2799ce | 2014-09-08 12:11:44 +0300 | [diff] [blame] | 841 | /* IPv6 address needs to have the U/L bit set properly so toggle |
| 842 | * it back here. |
| 843 | */ |
| 844 | set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8); |
| 845 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 846 | spin_lock(&devices_lock); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 847 | INIT_LIST_HEAD(&peer->list); |
| 848 | peer_add(dev, peer); |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 849 | spin_unlock(&devices_lock); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 850 | |
| 851 | /* Notifying peers about us needs to be done without locks held */ |
| 852 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); |
| 853 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); |
| 854 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 855 | return peer->chan; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 856 | } |
| 857 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 858 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 859 | { |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 860 | struct net_device *netdev; |
| 861 | int err = 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 862 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 863 | netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE, |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 864 | NET_NAME_UNKNOWN, netdev_setup); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 865 | if (!netdev) |
| 866 | return -ENOMEM; |
| 867 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 868 | set_dev_addr(netdev, &chan->src, chan->src_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 869 | |
| 870 | netdev->netdev_ops = &netdev_ops; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 871 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->dev); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 872 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
| 873 | |
| 874 | err = register_netdev(netdev); |
| 875 | if (err < 0) { |
| 876 | BT_INFO("register_netdev failed %d", err); |
| 877 | free_netdev(netdev); |
| 878 | goto out; |
| 879 | } |
| 880 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 881 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
| 882 | netdev->ifindex, &chan->dst, chan->dst_type, |
| 883 | &chan->src, chan->src_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 884 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
| 885 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 886 | *dev = netdev_priv(netdev); |
| 887 | (*dev)->netdev = netdev; |
| 888 | (*dev)->hdev = chan->conn->hcon->hdev; |
| 889 | INIT_LIST_HEAD(&(*dev)->peers); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 890 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 891 | spin_lock(&devices_lock); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 892 | INIT_LIST_HEAD(&(*dev)->list); |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 893 | list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); |
| 894 | spin_unlock(&devices_lock); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 895 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 896 | return 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 897 | |
| 898 | out: |
| 899 | return err; |
| 900 | } |
| 901 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 902 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
| 903 | { |
| 904 | struct lowpan_dev *dev; |
| 905 | |
| 906 | dev = lookup_dev(chan->conn); |
| 907 | |
| 908 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); |
| 909 | |
| 910 | if (!dev) { |
| 911 | if (setup_netdev(chan, &dev) < 0) { |
| 912 | l2cap_chan_del(chan, -ENOENT); |
| 913 | return; |
| 914 | } |
| 915 | } |
| 916 | |
Jukka Rissanen | 18d93c1 | 2014-06-18 16:37:10 +0300 | [diff] [blame] | 917 | if (!try_module_get(THIS_MODULE)) |
| 918 | return; |
| 919 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 920 | add_peer_chan(chan, dev); |
| 921 | ifup(dev->netdev); |
| 922 | } |
| 923 | |
Johan Hedberg | 2b29349 | 2014-08-07 10:03:32 +0300 | [diff] [blame] | 924 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 925 | { |
Johan Hedberg | 2b29349 | 2014-08-07 10:03:32 +0300 | [diff] [blame] | 926 | struct l2cap_chan *chan; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 927 | |
Johan Hedberg | 2b29349 | 2014-08-07 10:03:32 +0300 | [diff] [blame] | 928 | chan = chan_open(pchan); |
| 929 | chan->ops = pchan->ops; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 930 | |
| 931 | BT_DBG("chan %p pchan %p", chan, pchan); |
| 932 | |
Johan Hedberg | 2b29349 | 2014-08-07 10:03:32 +0300 | [diff] [blame] | 933 | return chan; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 934 | } |
| 935 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 936 | static void delete_netdev(struct work_struct *work) |
| 937 | { |
| 938 | struct lowpan_dev *entry = container_of(work, struct lowpan_dev, |
| 939 | delete_netdev); |
| 940 | |
| 941 | unregister_netdev(entry->netdev); |
| 942 | |
| 943 | /* The entry pointer is deleted in device_event() */ |
| 944 | } |
| 945 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 946 | static void chan_close_cb(struct l2cap_chan *chan) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 947 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 948 | struct lowpan_dev *entry; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 949 | struct lowpan_dev *dev = NULL; |
| 950 | struct lowpan_peer *peer; |
| 951 | int err = -ENOENT; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 952 | bool last = false, removed = true; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 953 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 954 | BT_DBG("chan %p conn %p", chan, chan->conn); |
| 955 | |
| 956 | if (chan->conn && chan->conn->hcon) { |
| 957 | if (!is_bt_6lowpan(chan->conn->hcon)) |
| 958 | return; |
| 959 | |
| 960 | /* If conn is set, then the netdev is also there and we should |
| 961 | * not remove it. |
| 962 | */ |
| 963 | removed = false; |
| 964 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 965 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 966 | spin_lock(&devices_lock); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 967 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 968 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 969 | dev = lowpan_dev(entry->netdev); |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 970 | peer = __peer_lookup_chan(dev, chan); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 971 | if (peer) { |
| 972 | last = peer_del(dev, peer); |
| 973 | err = 0; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 974 | |
| 975 | BT_DBG("dev %p removing %speer %p", dev, |
| 976 | last ? "last " : "1 ", peer); |
| 977 | BT_DBG("chan %p orig refcnt %d", chan, |
| 978 | atomic_read(&chan->kref.refcount)); |
| 979 | |
| 980 | l2cap_chan_put(chan); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 981 | break; |
| 982 | } |
| 983 | } |
| 984 | |
| 985 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 986 | spin_unlock(&devices_lock); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 987 | |
| 988 | cancel_delayed_work_sync(&dev->notify_peers); |
| 989 | |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 990 | ifdown(dev->netdev); |
| 991 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 992 | if (!removed) { |
| 993 | INIT_WORK(&entry->delete_netdev, delete_netdev); |
| 994 | schedule_work(&entry->delete_netdev); |
| 995 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 996 | } else { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 997 | spin_unlock(&devices_lock); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 998 | } |
| 999 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1000 | return; |
| 1001 | } |
| 1002 | |
| 1003 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) |
| 1004 | { |
| 1005 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, |
| 1006 | state_to_string(state), err); |
| 1007 | } |
| 1008 | |
| 1009 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, |
| 1010 | unsigned long hdr_len, |
| 1011 | unsigned long len, int nb) |
| 1012 | { |
| 1013 | /* Note that we must allocate using GFP_ATOMIC here as |
| 1014 | * this function is called originally from netdev hard xmit |
| 1015 | * function in atomic context. |
| 1016 | */ |
| 1017 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); |
| 1018 | } |
| 1019 | |
| 1020 | static void chan_suspend_cb(struct l2cap_chan *chan) |
| 1021 | { |
| 1022 | struct sk_buff *skb = chan->data; |
| 1023 | |
| 1024 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); |
| 1025 | |
Jukka Rissanen | 59790aa | 2014-09-29 10:55:46 +0300 | [diff] [blame] | 1026 | if (!skb) |
| 1027 | return; |
| 1028 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1029 | lowpan_cb(skb)->status = -EAGAIN; |
| 1030 | } |
| 1031 | |
| 1032 | static void chan_resume_cb(struct l2cap_chan *chan) |
| 1033 | { |
| 1034 | struct sk_buff *skb = chan->data; |
| 1035 | |
| 1036 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); |
| 1037 | |
Jukka Rissanen | 59790aa | 2014-09-29 10:55:46 +0300 | [diff] [blame] | 1038 | if (!skb) |
| 1039 | return; |
| 1040 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1041 | lowpan_cb(skb)->status = 0; |
| 1042 | } |
| 1043 | |
| 1044 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) |
| 1045 | { |
Jukka Rissanen | 2ae50d8 | 2014-09-08 12:11:43 +0300 | [diff] [blame] | 1046 | return L2CAP_CONN_TIMEOUT; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1047 | } |
| 1048 | |
| 1049 | static const struct l2cap_ops bt_6lowpan_chan_ops = { |
| 1050 | .name = "L2CAP 6LoWPAN channel", |
| 1051 | .new_connection = chan_new_conn_cb, |
| 1052 | .recv = chan_recv_cb, |
| 1053 | .close = chan_close_cb, |
| 1054 | .state_change = chan_state_change_cb, |
| 1055 | .ready = chan_ready_cb, |
| 1056 | .resume = chan_resume_cb, |
| 1057 | .suspend = chan_suspend_cb, |
| 1058 | .get_sndtimeo = chan_get_sndtimeo_cb, |
| 1059 | .alloc_skb = chan_alloc_skb_cb, |
| 1060 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, |
| 1061 | |
| 1062 | .teardown = l2cap_chan_no_teardown, |
| 1063 | .defer = l2cap_chan_no_defer, |
| 1064 | .set_shutdown = l2cap_chan_no_set_shutdown, |
| 1065 | }; |
| 1066 | |
| 1067 | static inline __u8 bdaddr_type(__u8 type) |
| 1068 | { |
| 1069 | if (type == ADDR_LE_DEV_PUBLIC) |
| 1070 | return BDADDR_LE_PUBLIC; |
| 1071 | else |
| 1072 | return BDADDR_LE_RANDOM; |
| 1073 | } |
| 1074 | |
| 1075 | static struct l2cap_chan *chan_get(void) |
| 1076 | { |
| 1077 | struct l2cap_chan *pchan; |
| 1078 | |
| 1079 | pchan = chan_create(); |
| 1080 | if (!pchan) |
| 1081 | return NULL; |
| 1082 | |
| 1083 | pchan->ops = &bt_6lowpan_chan_ops; |
| 1084 | |
| 1085 | return pchan; |
| 1086 | } |
| 1087 | |
| 1088 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) |
| 1089 | { |
| 1090 | struct l2cap_chan *pchan; |
| 1091 | int err; |
| 1092 | |
| 1093 | pchan = chan_get(); |
| 1094 | if (!pchan) |
| 1095 | return -EINVAL; |
| 1096 | |
| 1097 | err = l2cap_chan_connect(pchan, cpu_to_le16(psm_6lowpan), 0, |
| 1098 | addr, dst_type); |
| 1099 | |
| 1100 | BT_DBG("chan %p err %d", pchan, err); |
| 1101 | if (err < 0) |
| 1102 | l2cap_chan_put(pchan); |
| 1103 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1104 | return err; |
| 1105 | } |
| 1106 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1107 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) |
| 1108 | { |
| 1109 | struct lowpan_peer *peer; |
| 1110 | |
| 1111 | BT_DBG("conn %p dst type %d", conn, dst_type); |
| 1112 | |
| 1113 | peer = lookup_peer(conn); |
| 1114 | if (!peer) |
| 1115 | return -ENOENT; |
| 1116 | |
| 1117 | BT_DBG("peer %p chan %p", peer, peer->chan); |
| 1118 | |
| 1119 | l2cap_chan_close(peer->chan, ENOENT); |
| 1120 | |
| 1121 | return 0; |
| 1122 | } |
| 1123 | |
| 1124 | static struct l2cap_chan *bt_6lowpan_listen(void) |
| 1125 | { |
| 1126 | bdaddr_t *addr = BDADDR_ANY; |
| 1127 | struct l2cap_chan *pchan; |
| 1128 | int err; |
| 1129 | |
| 1130 | if (psm_6lowpan == 0) |
| 1131 | return NULL; |
| 1132 | |
| 1133 | pchan = chan_get(); |
| 1134 | if (!pchan) |
| 1135 | return NULL; |
| 1136 | |
| 1137 | pchan->state = BT_LISTEN; |
| 1138 | pchan->src_type = BDADDR_LE_PUBLIC; |
| 1139 | |
| 1140 | BT_DBG("psm 0x%04x chan %p src type %d", psm_6lowpan, pchan, |
| 1141 | pchan->src_type); |
| 1142 | |
| 1143 | err = l2cap_add_psm(pchan, addr, cpu_to_le16(psm_6lowpan)); |
| 1144 | if (err) { |
| 1145 | l2cap_chan_put(pchan); |
| 1146 | BT_ERR("psm cannot be added err %d", err); |
| 1147 | return NULL; |
| 1148 | } |
| 1149 | |
| 1150 | return pchan; |
| 1151 | } |
| 1152 | |
| 1153 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, |
| 1154 | struct l2cap_conn **conn) |
| 1155 | { |
| 1156 | struct hci_conn *hcon; |
| 1157 | struct hci_dev *hdev; |
| 1158 | bdaddr_t *src = BDADDR_ANY; |
| 1159 | int n; |
| 1160 | |
| 1161 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", |
| 1162 | &addr->b[5], &addr->b[4], &addr->b[3], |
| 1163 | &addr->b[2], &addr->b[1], &addr->b[0], |
| 1164 | addr_type); |
| 1165 | |
| 1166 | if (n < 7) |
| 1167 | return -EINVAL; |
| 1168 | |
| 1169 | hdev = hci_get_route(addr, src); |
| 1170 | if (!hdev) |
| 1171 | return -ENOENT; |
| 1172 | |
| 1173 | hci_dev_lock(hdev); |
| 1174 | hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr); |
| 1175 | hci_dev_unlock(hdev); |
| 1176 | |
| 1177 | if (!hcon) |
| 1178 | return -ENOENT; |
| 1179 | |
| 1180 | *conn = (struct l2cap_conn *)hcon->l2cap_data; |
| 1181 | |
| 1182 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); |
| 1183 | |
| 1184 | return 0; |
| 1185 | } |
| 1186 | |
| 1187 | static void disconnect_all_peers(void) |
| 1188 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1189 | struct lowpan_dev *entry; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1190 | struct lowpan_peer *peer, *tmp_peer, *new_peer; |
| 1191 | struct list_head peers; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1192 | |
| 1193 | INIT_LIST_HEAD(&peers); |
| 1194 | |
| 1195 | /* We make a separate list of peers as the close_cb() will |
| 1196 | * modify the device peers list so it is better not to mess |
| 1197 | * with the same list at the same time. |
| 1198 | */ |
| 1199 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1200 | rcu_read_lock(); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1201 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1202 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
| 1203 | list_for_each_entry_rcu(peer, &entry->peers, list) { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1204 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); |
| 1205 | if (!new_peer) |
| 1206 | break; |
| 1207 | |
| 1208 | new_peer->chan = peer->chan; |
| 1209 | INIT_LIST_HEAD(&new_peer->list); |
| 1210 | |
| 1211 | list_add(&new_peer->list, &peers); |
| 1212 | } |
| 1213 | } |
| 1214 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1215 | rcu_read_unlock(); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1216 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1217 | spin_lock(&devices_lock); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1218 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { |
| 1219 | l2cap_chan_close(peer->chan, ENOENT); |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1220 | |
| 1221 | list_del_rcu(&peer->list); |
| 1222 | call_rcu(&peer->rcu, peer_free); |
| 1223 | |
| 1224 | module_put(THIS_MODULE); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1225 | } |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1226 | spin_unlock(&devices_lock); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1227 | } |
| 1228 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1229 | struct set_psm { |
| 1230 | struct work_struct work; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1231 | u16 psm; |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1232 | }; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1233 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1234 | static void do_psm_set(struct work_struct *work) |
| 1235 | { |
| 1236 | struct set_psm *set_psm = container_of(work, struct set_psm, work); |
| 1237 | |
| 1238 | if (set_psm->psm == 0 || psm_6lowpan != set_psm->psm) |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1239 | /* Disconnect existing connections if 6lowpan is |
| 1240 | * disabled (psm = 0), or if psm changes. |
| 1241 | */ |
| 1242 | disconnect_all_peers(); |
| 1243 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1244 | psm_6lowpan = set_psm->psm; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1245 | |
| 1246 | if (listen_chan) { |
| 1247 | l2cap_chan_close(listen_chan, 0); |
| 1248 | l2cap_chan_put(listen_chan); |
| 1249 | } |
| 1250 | |
| 1251 | listen_chan = bt_6lowpan_listen(); |
| 1252 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1253 | kfree(set_psm); |
| 1254 | } |
| 1255 | |
| 1256 | static int lowpan_psm_set(void *data, u64 val) |
| 1257 | { |
| 1258 | struct set_psm *set_psm; |
| 1259 | |
| 1260 | set_psm = kzalloc(sizeof(*set_psm), GFP_KERNEL); |
| 1261 | if (!set_psm) |
| 1262 | return -ENOMEM; |
| 1263 | |
| 1264 | set_psm->psm = val; |
| 1265 | INIT_WORK(&set_psm->work, do_psm_set); |
| 1266 | |
| 1267 | schedule_work(&set_psm->work); |
| 1268 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1269 | return 0; |
| 1270 | } |
| 1271 | |
| 1272 | static int lowpan_psm_get(void *data, u64 *val) |
| 1273 | { |
| 1274 | *val = psm_6lowpan; |
| 1275 | return 0; |
| 1276 | } |
| 1277 | |
| 1278 | DEFINE_SIMPLE_ATTRIBUTE(lowpan_psm_fops, lowpan_psm_get, |
| 1279 | lowpan_psm_set, "%llu\n"); |
| 1280 | |
| 1281 | static ssize_t lowpan_control_write(struct file *fp, |
| 1282 | const char __user *user_buffer, |
| 1283 | size_t count, |
| 1284 | loff_t *position) |
| 1285 | { |
| 1286 | char buf[32]; |
| 1287 | size_t buf_size = min(count, sizeof(buf) - 1); |
| 1288 | int ret; |
| 1289 | bdaddr_t addr; |
| 1290 | u8 addr_type; |
| 1291 | struct l2cap_conn *conn = NULL; |
| 1292 | |
| 1293 | if (copy_from_user(buf, user_buffer, buf_size)) |
| 1294 | return -EFAULT; |
| 1295 | |
| 1296 | buf[buf_size] = '\0'; |
| 1297 | |
| 1298 | if (memcmp(buf, "connect ", 8) == 0) { |
| 1299 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); |
| 1300 | if (ret == -EINVAL) |
| 1301 | return ret; |
| 1302 | |
| 1303 | if (listen_chan) { |
| 1304 | l2cap_chan_close(listen_chan, 0); |
| 1305 | l2cap_chan_put(listen_chan); |
| 1306 | listen_chan = NULL; |
| 1307 | } |
| 1308 | |
| 1309 | if (conn) { |
| 1310 | struct lowpan_peer *peer; |
| 1311 | |
| 1312 | if (!is_bt_6lowpan(conn->hcon)) |
| 1313 | return -EINVAL; |
| 1314 | |
| 1315 | peer = lookup_peer(conn); |
| 1316 | if (peer) { |
| 1317 | BT_DBG("6LoWPAN connection already exists"); |
| 1318 | return -EALREADY; |
| 1319 | } |
| 1320 | |
| 1321 | BT_DBG("conn %p dst %pMR type %d user %d", conn, |
| 1322 | &conn->hcon->dst, conn->hcon->dst_type, |
| 1323 | addr_type); |
| 1324 | } |
| 1325 | |
| 1326 | ret = bt_6lowpan_connect(&addr, addr_type); |
| 1327 | if (ret < 0) |
| 1328 | return ret; |
| 1329 | |
| 1330 | return count; |
| 1331 | } |
| 1332 | |
| 1333 | if (memcmp(buf, "disconnect ", 11) == 0) { |
| 1334 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); |
| 1335 | if (ret < 0) |
| 1336 | return ret; |
| 1337 | |
| 1338 | ret = bt_6lowpan_disconnect(conn, addr_type); |
| 1339 | if (ret < 0) |
| 1340 | return ret; |
| 1341 | |
| 1342 | return count; |
| 1343 | } |
| 1344 | |
| 1345 | return count; |
| 1346 | } |
| 1347 | |
| 1348 | static int lowpan_control_show(struct seq_file *f, void *ptr) |
| 1349 | { |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1350 | struct lowpan_dev *entry; |
| 1351 | struct lowpan_peer *peer; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1352 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1353 | spin_lock(&devices_lock); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1354 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1355 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { |
| 1356 | list_for_each_entry(peer, &entry->peers, list) |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1357 | seq_printf(f, "%pMR (type %u)\n", |
| 1358 | &peer->chan->dst, peer->chan->dst_type); |
| 1359 | } |
| 1360 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1361 | spin_unlock(&devices_lock); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1362 | |
| 1363 | return 0; |
| 1364 | } |
| 1365 | |
| 1366 | static int lowpan_control_open(struct inode *inode, struct file *file) |
| 1367 | { |
| 1368 | return single_open(file, lowpan_control_show, inode->i_private); |
| 1369 | } |
| 1370 | |
| 1371 | static const struct file_operations lowpan_control_fops = { |
| 1372 | .open = lowpan_control_open, |
| 1373 | .read = seq_read, |
| 1374 | .write = lowpan_control_write, |
| 1375 | .llseek = seq_lseek, |
| 1376 | .release = single_release, |
| 1377 | }; |
| 1378 | |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1379 | static void disconnect_devices(void) |
| 1380 | { |
Dan Carpenter | daac197 | 2014-10-29 19:10:57 +0300 | [diff] [blame] | 1381 | struct lowpan_dev *entry, *tmp, *new_dev; |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1382 | struct list_head devices; |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1383 | |
| 1384 | INIT_LIST_HEAD(&devices); |
| 1385 | |
| 1386 | /* We make a separate list of devices because the unregister_netdev() |
| 1387 | * will call device_event() which will also want to modify the same |
| 1388 | * devices list. |
| 1389 | */ |
| 1390 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1391 | rcu_read_lock(); |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1392 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1393 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1394 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); |
| 1395 | if (!new_dev) |
| 1396 | break; |
| 1397 | |
| 1398 | new_dev->netdev = entry->netdev; |
| 1399 | INIT_LIST_HEAD(&new_dev->list); |
| 1400 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1401 | list_add_rcu(&new_dev->list, &devices); |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1402 | } |
| 1403 | |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1404 | rcu_read_unlock(); |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1405 | |
Dan Carpenter | daac197 | 2014-10-29 19:10:57 +0300 | [diff] [blame] | 1406 | list_for_each_entry_safe(entry, tmp, &devices, list) { |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1407 | ifdown(entry->netdev); |
| 1408 | BT_DBG("Unregistering netdev %s %p", |
| 1409 | entry->netdev->name, entry->netdev); |
| 1410 | unregister_netdev(entry->netdev); |
| 1411 | kfree(entry); |
| 1412 | } |
| 1413 | } |
| 1414 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1415 | static int device_event(struct notifier_block *unused, |
| 1416 | unsigned long event, void *ptr) |
| 1417 | { |
| 1418 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1419 | struct lowpan_dev *entry; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1420 | |
| 1421 | if (netdev->type != ARPHRD_6LOWPAN) |
| 1422 | return NOTIFY_DONE; |
| 1423 | |
| 1424 | switch (event) { |
| 1425 | case NETDEV_UNREGISTER: |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1426 | spin_lock(&devices_lock); |
| 1427 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1428 | if (entry->netdev == netdev) { |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1429 | BT_DBG("Unregistered netdev %s %p", |
| 1430 | netdev->name, netdev); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1431 | list_del(&entry->list); |
| 1432 | kfree(entry); |
| 1433 | break; |
| 1434 | } |
| 1435 | } |
Jukka Rissanen | 9030582 | 2014-10-28 17:16:47 +0200 | [diff] [blame] | 1436 | spin_unlock(&devices_lock); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1437 | break; |
| 1438 | } |
| 1439 | |
| 1440 | return NOTIFY_DONE; |
| 1441 | } |
| 1442 | |
| 1443 | static struct notifier_block bt_6lowpan_dev_notifier = { |
| 1444 | .notifier_call = device_event, |
| 1445 | }; |
| 1446 | |
Jukka Rissanen | 5547e48 | 2014-06-18 16:37:09 +0300 | [diff] [blame] | 1447 | static int __init bt_6lowpan_init(void) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1448 | { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1449 | lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644, |
| 1450 | bt_debugfs, NULL, |
| 1451 | &lowpan_psm_fops); |
| 1452 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, |
| 1453 | bt_debugfs, NULL, |
| 1454 | &lowpan_control_fops); |
| 1455 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1456 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
| 1457 | } |
| 1458 | |
Jukka Rissanen | 5547e48 | 2014-06-18 16:37:09 +0300 | [diff] [blame] | 1459 | static void __exit bt_6lowpan_exit(void) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1460 | { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1461 | debugfs_remove(lowpan_psm_debugfs); |
| 1462 | debugfs_remove(lowpan_control_debugfs); |
| 1463 | |
| 1464 | if (listen_chan) { |
| 1465 | l2cap_chan_close(listen_chan, 0); |
| 1466 | l2cap_chan_put(listen_chan); |
| 1467 | } |
| 1468 | |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1469 | disconnect_devices(); |
| 1470 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1471 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
| 1472 | } |
Jukka Rissanen | 5547e48 | 2014-06-18 16:37:09 +0300 | [diff] [blame] | 1473 | |
| 1474 | module_init(bt_6lowpan_init); |
| 1475 | module_exit(bt_6lowpan_exit); |
| 1476 | |
| 1477 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); |
| 1478 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); |
| 1479 | MODULE_VERSION(VERSION); |
| 1480 | MODULE_LICENSE("GPL"); |