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); |
| 56 | static DEFINE_RWLOCK(devices_lock); |
| 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 | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 70 | struct l2cap_chan *chan; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 71 | |
| 72 | /* peer addresses in various formats */ |
| 73 | unsigned char eui64_addr[EUI64_ADDR_LEN]; |
| 74 | struct in6_addr peer_addr; |
| 75 | }; |
| 76 | |
| 77 | struct lowpan_dev { |
| 78 | struct list_head list; |
| 79 | |
| 80 | struct hci_dev *hdev; |
| 81 | struct net_device *netdev; |
| 82 | struct list_head peers; |
| 83 | atomic_t peer_count; /* number of items in peers list */ |
| 84 | |
| 85 | struct work_struct delete_netdev; |
| 86 | struct delayed_work notify_peers; |
| 87 | }; |
| 88 | |
| 89 | static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev) |
| 90 | { |
| 91 | return netdev_priv(netdev); |
| 92 | } |
| 93 | |
| 94 | static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer) |
| 95 | { |
| 96 | list_add(&peer->list, &dev->peers); |
| 97 | atomic_inc(&dev->peer_count); |
| 98 | } |
| 99 | |
| 100 | static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer) |
| 101 | { |
| 102 | list_del(&peer->list); |
| 103 | |
Jukka Rissanen | 18d93c1 | 2014-06-18 16:37:10 +0300 | [diff] [blame] | 104 | module_put(THIS_MODULE); |
| 105 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 106 | if (atomic_dec_and_test(&dev->peer_count)) { |
| 107 | BT_DBG("last peer"); |
| 108 | return true; |
| 109 | } |
| 110 | |
| 111 | return false; |
| 112 | } |
| 113 | |
| 114 | static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev, |
| 115 | bdaddr_t *ba, __u8 type) |
| 116 | { |
| 117 | struct lowpan_peer *peer, *tmp; |
| 118 | |
| 119 | BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count), |
| 120 | ba, type); |
| 121 | |
| 122 | list_for_each_entry_safe(peer, tmp, &dev->peers, list) { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 123 | BT_DBG("dst addr %pMR dst type %d", |
| 124 | &peer->chan->dst, peer->chan->dst_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 125 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 126 | if (bacmp(&peer->chan->dst, ba)) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 127 | continue; |
| 128 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 129 | if (type == peer->chan->dst_type) |
| 130 | return peer; |
| 131 | } |
| 132 | |
| 133 | return NULL; |
| 134 | } |
| 135 | |
| 136 | static inline struct lowpan_peer *peer_lookup_chan(struct lowpan_dev *dev, |
| 137 | struct l2cap_chan *chan) |
| 138 | { |
| 139 | struct lowpan_peer *peer, *tmp; |
| 140 | |
| 141 | list_for_each_entry_safe(peer, tmp, &dev->peers, list) { |
| 142 | if (peer->chan == chan) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 143 | return peer; |
| 144 | } |
| 145 | |
| 146 | return NULL; |
| 147 | } |
| 148 | |
| 149 | static inline struct lowpan_peer *peer_lookup_conn(struct lowpan_dev *dev, |
| 150 | struct l2cap_conn *conn) |
| 151 | { |
| 152 | struct lowpan_peer *peer, *tmp; |
| 153 | |
| 154 | list_for_each_entry_safe(peer, tmp, &dev->peers, list) { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 155 | if (peer->chan->conn == conn) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 156 | return peer; |
| 157 | } |
| 158 | |
| 159 | return NULL; |
| 160 | } |
| 161 | |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 162 | static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev, |
| 163 | struct in6_addr *daddr, |
| 164 | struct sk_buff *skb) |
| 165 | { |
| 166 | struct lowpan_peer *peer, *tmp; |
| 167 | struct in6_addr *nexthop; |
| 168 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
| 169 | int count = atomic_read(&dev->peer_count); |
| 170 | |
| 171 | BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt); |
| 172 | |
| 173 | /* If we have multiple 6lowpan peers, then check where we should |
| 174 | * send the packet. If only one peer exists, then we can send the |
| 175 | * packet right away. |
| 176 | */ |
| 177 | if (count == 1) |
| 178 | return list_first_entry(&dev->peers, struct lowpan_peer, |
| 179 | list); |
| 180 | |
| 181 | if (!rt) { |
| 182 | nexthop = &lowpan_cb(skb)->gw; |
| 183 | |
| 184 | if (ipv6_addr_any(nexthop)) |
| 185 | return NULL; |
| 186 | } else { |
| 187 | nexthop = rt6_nexthop(rt); |
| 188 | |
| 189 | /* We need to remember the address because it is needed |
| 190 | * by bt_xmit() when sending the packet. In bt_xmit(), the |
| 191 | * destination routing info is not set. |
| 192 | */ |
| 193 | memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr)); |
| 194 | } |
| 195 | |
| 196 | BT_DBG("gw %pI6c", nexthop); |
| 197 | |
| 198 | list_for_each_entry_safe(peer, tmp, &dev->peers, list) { |
| 199 | BT_DBG("dst addr %pMR dst type %d ip %pI6c", |
| 200 | &peer->chan->dst, peer->chan->dst_type, |
| 201 | &peer->peer_addr); |
| 202 | |
| 203 | if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) |
| 204 | return peer; |
| 205 | } |
| 206 | |
| 207 | return NULL; |
| 208 | } |
| 209 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 210 | static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) |
| 211 | { |
| 212 | struct lowpan_dev *entry, *tmp; |
| 213 | struct lowpan_peer *peer = NULL; |
| 214 | unsigned long flags; |
| 215 | |
| 216 | read_lock_irqsave(&devices_lock, flags); |
| 217 | |
| 218 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) { |
| 219 | peer = peer_lookup_conn(entry, conn); |
| 220 | if (peer) |
| 221 | break; |
| 222 | } |
| 223 | |
| 224 | read_unlock_irqrestore(&devices_lock, flags); |
| 225 | |
| 226 | return peer; |
| 227 | } |
| 228 | |
| 229 | static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn) |
| 230 | { |
| 231 | struct lowpan_dev *entry, *tmp; |
| 232 | struct lowpan_dev *dev = NULL; |
| 233 | unsigned long flags; |
| 234 | |
| 235 | read_lock_irqsave(&devices_lock, flags); |
| 236 | |
| 237 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) { |
| 238 | if (conn->hcon->hdev == entry->hdev) { |
| 239 | dev = entry; |
| 240 | break; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | read_unlock_irqrestore(&devices_lock, flags); |
| 245 | |
| 246 | return dev; |
| 247 | } |
| 248 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 249 | static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
| 250 | { |
| 251 | struct sk_buff *skb_cp; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 252 | |
| 253 | skb_cp = skb_copy(skb, GFP_ATOMIC); |
| 254 | if (!skb_cp) |
Martin Townsend | f8b3617 | 2014-10-23 15:40:53 +0100 | [diff] [blame] | 255 | return NET_RX_DROP; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 256 | |
Li RongQing | 4456c50 | 2014-10-16 10:21:55 +0800 | [diff] [blame] | 257 | return netif_rx(skb_cp); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | static int process_data(struct sk_buff *skb, struct net_device *netdev, |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 261 | struct l2cap_chan *chan) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 262 | { |
| 263 | const u8 *saddr, *daddr; |
| 264 | u8 iphc0, iphc1; |
| 265 | struct lowpan_dev *dev; |
| 266 | struct lowpan_peer *peer; |
| 267 | unsigned long flags; |
| 268 | |
| 269 | dev = lowpan_dev(netdev); |
| 270 | |
| 271 | read_lock_irqsave(&devices_lock, flags); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 272 | peer = peer_lookup_chan(dev, chan); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 273 | read_unlock_irqrestore(&devices_lock, flags); |
| 274 | if (!peer) |
| 275 | goto drop; |
| 276 | |
| 277 | saddr = peer->eui64_addr; |
| 278 | daddr = dev->netdev->dev_addr; |
| 279 | |
| 280 | /* at least two bytes will be used for the encoding */ |
| 281 | if (skb->len < 2) |
| 282 | goto drop; |
| 283 | |
| 284 | if (lowpan_fetch_skb_u8(skb, &iphc0)) |
| 285 | goto drop; |
| 286 | |
| 287 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
| 288 | goto drop; |
| 289 | |
| 290 | return lowpan_process_data(skb, netdev, |
| 291 | saddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN, |
| 292 | daddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN, |
Martin Townsend | f8b3617 | 2014-10-23 15:40:53 +0100 | [diff] [blame] | 293 | iphc0, iphc1); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 294 | |
| 295 | drop: |
| 296 | kfree_skb(skb); |
| 297 | return -EINVAL; |
| 298 | } |
| 299 | |
| 300 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 301 | struct l2cap_chan *chan) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 302 | { |
| 303 | struct sk_buff *local_skb; |
| 304 | int ret; |
| 305 | |
| 306 | if (!netif_running(dev)) |
| 307 | goto drop; |
| 308 | |
| 309 | if (dev->type != ARPHRD_6LOWPAN) |
| 310 | goto drop; |
| 311 | |
Martin Townsend | 11e3ff7 | 2014-10-13 11:00:56 +0100 | [diff] [blame] | 312 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 313 | if (!skb) |
| 314 | goto drop; |
| 315 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 316 | /* check that it's our buffer */ |
| 317 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { |
| 318 | /* Copy the packet so that the IPv6 header is |
| 319 | * properly aligned. |
| 320 | */ |
| 321 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, |
| 322 | skb_tailroom(skb), GFP_ATOMIC); |
| 323 | if (!local_skb) |
| 324 | goto drop; |
| 325 | |
| 326 | local_skb->protocol = htons(ETH_P_IPV6); |
| 327 | local_skb->pkt_type = PACKET_HOST; |
| 328 | |
| 329 | skb_reset_network_header(local_skb); |
| 330 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); |
| 331 | |
| 332 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { |
| 333 | kfree_skb(local_skb); |
| 334 | goto drop; |
| 335 | } |
| 336 | |
| 337 | dev->stats.rx_bytes += skb->len; |
| 338 | dev->stats.rx_packets++; |
| 339 | |
| 340 | kfree_skb(local_skb); |
| 341 | kfree_skb(skb); |
| 342 | } else { |
| 343 | switch (skb->data[0] & 0xe0) { |
| 344 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ |
| 345 | local_skb = skb_clone(skb, GFP_ATOMIC); |
| 346 | if (!local_skb) |
| 347 | goto drop; |
| 348 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 349 | ret = process_data(local_skb, dev, chan); |
Martin Townsend | 04dfd73 | 2014-10-23 15:40:54 +0100 | [diff] [blame^] | 350 | if (ret < 0) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 351 | goto drop; |
| 352 | |
Martin Townsend | f8b3617 | 2014-10-23 15:40:53 +0100 | [diff] [blame] | 353 | local_skb->protocol = htons(ETH_P_IPV6); |
| 354 | local_skb->pkt_type = PACKET_HOST; |
| 355 | local_skb->dev = dev; |
| 356 | |
| 357 | if (give_skb_to_upper(local_skb, dev) |
| 358 | != NET_RX_SUCCESS) { |
| 359 | kfree_skb(local_skb); |
| 360 | goto drop; |
| 361 | } |
| 362 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 363 | dev->stats.rx_bytes += skb->len; |
| 364 | dev->stats.rx_packets++; |
| 365 | |
| 366 | kfree_skb(skb); |
| 367 | break; |
| 368 | default: |
| 369 | break; |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | return NET_RX_SUCCESS; |
| 374 | |
| 375 | drop: |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 376 | dev->stats.rx_dropped++; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 377 | kfree_skb(skb); |
| 378 | return NET_RX_DROP; |
| 379 | } |
| 380 | |
| 381 | /* Packet from BT LE device */ |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 382 | 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] | 383 | { |
| 384 | struct lowpan_dev *dev; |
| 385 | struct lowpan_peer *peer; |
| 386 | int err; |
| 387 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 388 | peer = lookup_peer(chan->conn); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 389 | if (!peer) |
| 390 | return -ENOENT; |
| 391 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 392 | dev = lookup_dev(chan->conn); |
Johan Hedberg | 30d3db4 | 2013-12-12 09:53:21 +0200 | [diff] [blame] | 393 | if (!dev || !dev->netdev) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 394 | return -ENOENT; |
| 395 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 396 | err = recv_pkt(skb, dev->netdev, chan); |
| 397 | if (err) { |
| 398 | BT_DBG("recv pkt %d", err); |
| 399 | err = -EAGAIN; |
| 400 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 401 | |
| 402 | return err; |
| 403 | } |
| 404 | |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 405 | static u8 get_addr_type_from_eui64(u8 byte) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 406 | { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 407 | /* Is universal(0) or local(1) bit */ |
| 408 | return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC); |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 409 | } |
| 410 | |
| 411 | static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr) |
| 412 | { |
| 413 | u8 *eui64 = ip6_daddr->s6_addr + 8; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 414 | |
| 415 | addr->b[0] = eui64[7]; |
| 416 | addr->b[1] = eui64[6]; |
| 417 | addr->b[2] = eui64[5]; |
| 418 | addr->b[3] = eui64[2]; |
| 419 | addr->b[4] = eui64[1]; |
| 420 | addr->b[5] = eui64[0]; |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 421 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 422 | |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 423 | static void convert_dest_bdaddr(struct in6_addr *ip6_daddr, |
| 424 | bdaddr_t *addr, u8 *addr_type) |
| 425 | { |
| 426 | copy_to_bdaddr(ip6_daddr, addr); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 427 | |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 428 | /* We need to toggle the U/L bit that we got from IPv6 address |
| 429 | * so that we get the proper address and type of the BD address. |
| 430 | */ |
| 431 | addr->b[5] ^= 0x02; |
| 432 | |
| 433 | *addr_type = get_addr_type_from_eui64(addr->b[5]); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 434 | } |
| 435 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 436 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
| 437 | bdaddr_t *peer_addr, u8 *peer_addr_type) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 438 | { |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 439 | struct in6_addr ipv6_daddr; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 440 | struct lowpan_dev *dev; |
| 441 | struct lowpan_peer *peer; |
| 442 | bdaddr_t addr, *any = BDADDR_ANY; |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 443 | u8 *daddr = any->b; |
| 444 | int err, status = 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 445 | |
| 446 | dev = lowpan_dev(netdev); |
| 447 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 448 | memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr)); |
| 449 | |
| 450 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 451 | lowpan_cb(skb)->chan = NULL; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 452 | } else { |
| 453 | unsigned long flags; |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 454 | u8 addr_type; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 455 | |
| 456 | /* Get destination BT device from skb. |
| 457 | * If there is no such peer then discard the packet. |
| 458 | */ |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 459 | convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 460 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 461 | BT_DBG("dest addr %pMR type %d IP %pI6c", &addr, |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 462 | addr_type, &ipv6_daddr); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 463 | |
| 464 | read_lock_irqsave(&devices_lock, flags); |
| 465 | peer = peer_lookup_ba(dev, &addr, addr_type); |
| 466 | read_unlock_irqrestore(&devices_lock, flags); |
| 467 | |
| 468 | if (!peer) { |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 469 | /* The packet might be sent to 6lowpan interface |
| 470 | * because of routing (either via default route |
| 471 | * or user set route) so get peer according to |
| 472 | * the destination address. |
| 473 | */ |
| 474 | read_lock_irqsave(&devices_lock, flags); |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 475 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
Jukka Rissanen | 39e90c7 | 2014-09-08 12:11:45 +0300 | [diff] [blame] | 476 | read_unlock_irqrestore(&devices_lock, flags); |
| 477 | if (!peer) { |
| 478 | BT_DBG("no such peer %pMR found", &addr); |
| 479 | return -ENOENT; |
| 480 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 481 | } |
| 482 | |
| 483 | daddr = peer->eui64_addr; |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 484 | *peer_addr = addr; |
| 485 | *peer_addr_type = addr_type; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 486 | lowpan_cb(skb)->chan = peer->chan; |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 487 | |
| 488 | status = 1; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 489 | } |
| 490 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 491 | lowpan_header_compress(skb, netdev, ETH_P_IPV6, daddr, |
| 492 | dev->netdev->dev_addr, skb->len); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 493 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 494 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); |
| 495 | if (err < 0) |
| 496 | return err; |
| 497 | |
| 498 | return status; |
| 499 | } |
| 500 | |
| 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) |
| 504 | { |
| 505 | struct ipv6hdr *hdr; |
| 506 | |
| 507 | if (type != ETH_P_IPV6) |
| 508 | return -EINVAL; |
| 509 | |
| 510 | hdr = ipv6_hdr(skb); |
| 511 | |
| 512 | memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr)); |
| 513 | |
| 514 | return 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | /* Packet to BT LE device */ |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 518 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
Jukka Rissanen | d7b6b0a | 2014-10-01 15:59:14 +0300 | [diff] [blame] | 519 | struct net_device *netdev) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 520 | { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 521 | struct msghdr msg; |
| 522 | struct kvec iv; |
| 523 | int err; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 524 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 525 | /* 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] | 526 | * we run out of credits. |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 527 | */ |
Jukka Rissanen | d7b6b0a | 2014-10-01 15:59:14 +0300 | [diff] [blame] | 528 | chan->data = skb; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 529 | |
| 530 | memset(&msg, 0, sizeof(msg)); |
| 531 | msg.msg_iov = (struct iovec *) &iv; |
| 532 | msg.msg_iovlen = 1; |
| 533 | iv.iov_base = skb->data; |
| 534 | iv.iov_len = skb->len; |
| 535 | |
| 536 | err = l2cap_chan_send(chan, &msg, skb->len); |
| 537 | if (err > 0) { |
| 538 | netdev->stats.tx_bytes += err; |
| 539 | netdev->stats.tx_packets++; |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | if (!err) |
| 544 | err = lowpan_cb(skb)->status; |
| 545 | |
| 546 | if (err < 0) { |
| 547 | if (err == -EAGAIN) |
| 548 | netdev->stats.tx_dropped++; |
| 549 | else |
| 550 | netdev->stats.tx_errors++; |
| 551 | } |
| 552 | |
| 553 | return err; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 554 | } |
| 555 | |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 556 | 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] | 557 | { |
| 558 | struct sk_buff *local_skb; |
| 559 | struct lowpan_dev *entry, *tmp; |
| 560 | unsigned long flags; |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 561 | int err = 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 562 | |
| 563 | read_lock_irqsave(&devices_lock, flags); |
| 564 | |
| 565 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) { |
| 566 | struct lowpan_peer *pentry, *ptmp; |
| 567 | struct lowpan_dev *dev; |
| 568 | |
| 569 | if (entry->netdev != netdev) |
| 570 | continue; |
| 571 | |
| 572 | dev = lowpan_dev(entry->netdev); |
| 573 | |
| 574 | list_for_each_entry_safe(pentry, ptmp, &dev->peers, list) { |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 575 | int ret; |
| 576 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 577 | local_skb = skb_clone(skb, GFP_ATOMIC); |
| 578 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 579 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
| 580 | netdev->name, |
| 581 | &pentry->chan->dst, pentry->chan->dst_type, |
| 582 | &pentry->peer_addr, pentry->chan); |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 583 | ret = send_pkt(pentry->chan, local_skb, netdev); |
| 584 | if (ret < 0) |
| 585 | err = ret; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 586 | |
| 587 | kfree_skb(local_skb); |
| 588 | } |
| 589 | } |
| 590 | |
| 591 | read_unlock_irqrestore(&devices_lock, flags); |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 592 | |
| 593 | return err; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 594 | } |
| 595 | |
| 596 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) |
| 597 | { |
| 598 | int err = 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 599 | bdaddr_t addr; |
| 600 | u8 addr_type; |
Jukka Rissanen | a7807d73 | 2014-10-01 11:30:57 +0300 | [diff] [blame] | 601 | struct sk_buff *tmpskb; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 602 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 603 | /* We must take a copy of the skb before we modify/replace the ipv6 |
| 604 | * header as the header could be used elsewhere |
| 605 | */ |
Jukka Rissanen | a7807d73 | 2014-10-01 11:30:57 +0300 | [diff] [blame] | 606 | tmpskb = skb_unshare(skb, GFP_ATOMIC); |
| 607 | if (!tmpskb) { |
| 608 | kfree_skb(skb); |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 609 | return NET_XMIT_DROP; |
Jukka Rissanen | a7807d73 | 2014-10-01 11:30:57 +0300 | [diff] [blame] | 610 | } |
| 611 | skb = tmpskb; |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 612 | |
| 613 | /* Return values from setup_header() |
| 614 | * <0 - error, packet is dropped |
| 615 | * 0 - this is a multicast packet |
| 616 | * 1 - this is unicast packet |
| 617 | */ |
| 618 | err = setup_header(skb, netdev, &addr, &addr_type); |
| 619 | if (err < 0) { |
| 620 | kfree_skb(skb); |
| 621 | return NET_XMIT_DROP; |
| 622 | } |
| 623 | |
| 624 | if (err) { |
| 625 | if (lowpan_cb(skb)->chan) { |
| 626 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
| 627 | netdev->name, &addr, addr_type, |
| 628 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); |
Jukka Rissanen | d7b6b0a | 2014-10-01 15:59:14 +0300 | [diff] [blame] | 629 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 630 | } else { |
| 631 | err = -ENOENT; |
| 632 | } |
| 633 | } else { |
| 634 | /* We need to send the packet to every device behind this |
| 635 | * interface. |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 636 | */ |
Jukka Rissanen | 9c238ca | 2014-10-01 15:59:15 +0300 | [diff] [blame] | 637 | err = send_mcast_pkt(skb, netdev); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 638 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 639 | |
Jukka Rissanen | fc12518 | 2014-10-01 11:30:26 +0300 | [diff] [blame] | 640 | dev_kfree_skb(skb); |
| 641 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 642 | if (err) |
| 643 | BT_DBG("ERROR: xmit failed (%d)", err); |
| 644 | |
Jukka Rissanen | 36b3dd2 | 2014-09-29 16:37:25 +0300 | [diff] [blame] | 645 | return err < 0 ? NET_XMIT_DROP : err; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 646 | } |
| 647 | |
| 648 | static const struct net_device_ops netdev_ops = { |
| 649 | .ndo_start_xmit = bt_xmit, |
| 650 | }; |
| 651 | |
| 652 | static struct header_ops header_ops = { |
| 653 | .create = header_create, |
| 654 | }; |
| 655 | |
| 656 | static void netdev_setup(struct net_device *dev) |
| 657 | { |
| 658 | dev->addr_len = EUI64_ADDR_LEN; |
| 659 | dev->type = ARPHRD_6LOWPAN; |
| 660 | |
| 661 | dev->hard_header_len = 0; |
| 662 | dev->needed_tailroom = 0; |
| 663 | dev->mtu = IPV6_MIN_MTU; |
| 664 | dev->tx_queue_len = 0; |
Jukka Rissanen | 156395c | 2014-09-29 16:37:26 +0300 | [diff] [blame] | 665 | dev->flags = IFF_RUNNING | IFF_POINTOPOINT | |
| 666 | IFF_MULTICAST; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 667 | dev->watchdog_timeo = 0; |
| 668 | |
| 669 | dev->netdev_ops = &netdev_ops; |
| 670 | dev->header_ops = &header_ops; |
| 671 | dev->destructor = free_netdev; |
| 672 | } |
| 673 | |
| 674 | static struct device_type bt_type = { |
| 675 | .name = "bluetooth", |
| 676 | }; |
| 677 | |
| 678 | static void set_addr(u8 *eui, u8 *addr, u8 addr_type) |
| 679 | { |
| 680 | /* addr is the BT address in little-endian format */ |
| 681 | eui[0] = addr[5]; |
| 682 | eui[1] = addr[4]; |
| 683 | eui[2] = addr[3]; |
| 684 | eui[3] = 0xFF; |
| 685 | eui[4] = 0xFE; |
| 686 | eui[5] = addr[2]; |
| 687 | eui[6] = addr[1]; |
| 688 | eui[7] = addr[0]; |
| 689 | |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 690 | /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */ |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 691 | if (addr_type == BDADDR_LE_PUBLIC) |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 692 | eui[0] &= ~0x02; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 693 | else |
Jukka Rissanen | 62bbd5b | 2014-05-27 11:33:22 +0300 | [diff] [blame] | 694 | eui[0] |= 0x02; |
| 695 | |
| 696 | BT_DBG("type %d addr %*phC", addr_type, 8, eui); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 697 | } |
| 698 | |
| 699 | static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr, |
| 700 | u8 addr_type) |
| 701 | { |
| 702 | netdev->addr_assign_type = NET_ADDR_PERM; |
| 703 | set_addr(netdev->dev_addr, addr->b, addr_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | static void ifup(struct net_device *netdev) |
| 707 | { |
| 708 | int err; |
| 709 | |
| 710 | rtnl_lock(); |
| 711 | err = dev_open(netdev); |
| 712 | if (err < 0) |
| 713 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); |
| 714 | rtnl_unlock(); |
| 715 | } |
| 716 | |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 717 | static void ifdown(struct net_device *netdev) |
| 718 | { |
| 719 | int err; |
| 720 | |
| 721 | rtnl_lock(); |
| 722 | err = dev_close(netdev); |
| 723 | if (err < 0) |
| 724 | BT_INFO("iface %s cannot be closed (%d)", netdev->name, err); |
| 725 | rtnl_unlock(); |
| 726 | } |
| 727 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 728 | static void do_notify_peers(struct work_struct *work) |
| 729 | { |
| 730 | struct lowpan_dev *dev = container_of(work, struct lowpan_dev, |
| 731 | notify_peers.work); |
| 732 | |
| 733 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ |
| 734 | } |
| 735 | |
| 736 | static bool is_bt_6lowpan(struct hci_conn *hcon) |
| 737 | { |
| 738 | if (hcon->type != LE_LINK) |
| 739 | return false; |
| 740 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 741 | if (!psm_6lowpan) |
| 742 | return false; |
| 743 | |
| 744 | return true; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 745 | } |
| 746 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 747 | static struct l2cap_chan *chan_create(void) |
| 748 | { |
| 749 | struct l2cap_chan *chan; |
| 750 | |
| 751 | chan = l2cap_chan_create(); |
| 752 | if (!chan) |
| 753 | return NULL; |
| 754 | |
| 755 | l2cap_chan_set_defaults(chan); |
| 756 | |
| 757 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; |
| 758 | chan->mode = L2CAP_MODE_LE_FLOWCTL; |
| 759 | chan->omtu = 65535; |
| 760 | chan->imtu = chan->omtu; |
| 761 | |
| 762 | return chan; |
| 763 | } |
| 764 | |
| 765 | static struct l2cap_chan *chan_open(struct l2cap_chan *pchan) |
| 766 | { |
| 767 | struct l2cap_chan *chan; |
| 768 | |
| 769 | chan = chan_create(); |
| 770 | if (!chan) |
| 771 | return NULL; |
| 772 | |
| 773 | chan->remote_mps = chan->omtu; |
| 774 | chan->mps = chan->omtu; |
| 775 | |
| 776 | chan->state = BT_CONNECTED; |
| 777 | |
| 778 | return chan; |
| 779 | } |
| 780 | |
Jukka Rissanen | b2799ce | 2014-09-08 12:11:44 +0300 | [diff] [blame] | 781 | static void set_ip_addr_bits(u8 addr_type, u8 *addr) |
| 782 | { |
| 783 | if (addr_type == BDADDR_LE_PUBLIC) |
| 784 | *addr |= 0x02; |
| 785 | else |
| 786 | *addr &= ~0x02; |
| 787 | } |
| 788 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 789 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
| 790 | struct lowpan_dev *dev) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 791 | { |
| 792 | struct lowpan_peer *peer; |
| 793 | unsigned long flags; |
| 794 | |
| 795 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); |
| 796 | if (!peer) |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 797 | return NULL; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 798 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 799 | peer->chan = chan; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 800 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); |
| 801 | |
| 802 | /* RFC 2464 ch. 5 */ |
| 803 | peer->peer_addr.s6_addr[0] = 0xFE; |
| 804 | peer->peer_addr.s6_addr[1] = 0x80; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 805 | set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b, |
| 806 | chan->dst_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 807 | |
| 808 | memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8, |
| 809 | EUI64_ADDR_LEN); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 810 | |
Jukka Rissanen | b2799ce | 2014-09-08 12:11:44 +0300 | [diff] [blame] | 811 | /* IPv6 address needs to have the U/L bit set properly so toggle |
| 812 | * it back here. |
| 813 | */ |
| 814 | set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8); |
| 815 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 816 | write_lock_irqsave(&devices_lock, flags); |
| 817 | INIT_LIST_HEAD(&peer->list); |
| 818 | peer_add(dev, peer); |
| 819 | write_unlock_irqrestore(&devices_lock, flags); |
| 820 | |
| 821 | /* Notifying peers about us needs to be done without locks held */ |
| 822 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); |
| 823 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); |
| 824 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 825 | return peer->chan; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 826 | } |
| 827 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 828 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 829 | { |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 830 | struct net_device *netdev; |
| 831 | int err = 0; |
| 832 | unsigned long flags; |
| 833 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 834 | netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE, |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 835 | NET_NAME_UNKNOWN, netdev_setup); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 836 | if (!netdev) |
| 837 | return -ENOMEM; |
| 838 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 839 | set_dev_addr(netdev, &chan->src, chan->src_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 840 | |
| 841 | netdev->netdev_ops = &netdev_ops; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 842 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->dev); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 843 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
| 844 | |
| 845 | err = register_netdev(netdev); |
| 846 | if (err < 0) { |
| 847 | BT_INFO("register_netdev failed %d", err); |
| 848 | free_netdev(netdev); |
| 849 | goto out; |
| 850 | } |
| 851 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 852 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
| 853 | netdev->ifindex, &chan->dst, chan->dst_type, |
| 854 | &chan->src, chan->src_type); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 855 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
| 856 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 857 | *dev = netdev_priv(netdev); |
| 858 | (*dev)->netdev = netdev; |
| 859 | (*dev)->hdev = chan->conn->hcon->hdev; |
| 860 | INIT_LIST_HEAD(&(*dev)->peers); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 861 | |
| 862 | write_lock_irqsave(&devices_lock, flags); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 863 | INIT_LIST_HEAD(&(*dev)->list); |
| 864 | list_add(&(*dev)->list, &bt_6lowpan_devices); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 865 | write_unlock_irqrestore(&devices_lock, flags); |
| 866 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 867 | return 0; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 868 | |
| 869 | out: |
| 870 | return err; |
| 871 | } |
| 872 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 873 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
| 874 | { |
| 875 | struct lowpan_dev *dev; |
| 876 | |
| 877 | dev = lookup_dev(chan->conn); |
| 878 | |
| 879 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); |
| 880 | |
| 881 | if (!dev) { |
| 882 | if (setup_netdev(chan, &dev) < 0) { |
| 883 | l2cap_chan_del(chan, -ENOENT); |
| 884 | return; |
| 885 | } |
| 886 | } |
| 887 | |
Jukka Rissanen | 18d93c1 | 2014-06-18 16:37:10 +0300 | [diff] [blame] | 888 | if (!try_module_get(THIS_MODULE)) |
| 889 | return; |
| 890 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 891 | add_peer_chan(chan, dev); |
| 892 | ifup(dev->netdev); |
| 893 | } |
| 894 | |
Johan Hedberg | 2b29349 | 2014-08-07 10:03:32 +0300 | [diff] [blame] | 895 | 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] | 896 | { |
Johan Hedberg | 2b29349 | 2014-08-07 10:03:32 +0300 | [diff] [blame] | 897 | struct l2cap_chan *chan; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 898 | |
Johan Hedberg | 2b29349 | 2014-08-07 10:03:32 +0300 | [diff] [blame] | 899 | chan = chan_open(pchan); |
| 900 | chan->ops = pchan->ops; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 901 | |
| 902 | BT_DBG("chan %p pchan %p", chan, pchan); |
| 903 | |
Johan Hedberg | 2b29349 | 2014-08-07 10:03:32 +0300 | [diff] [blame] | 904 | return chan; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 905 | } |
| 906 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 907 | static void delete_netdev(struct work_struct *work) |
| 908 | { |
| 909 | struct lowpan_dev *entry = container_of(work, struct lowpan_dev, |
| 910 | delete_netdev); |
| 911 | |
| 912 | unregister_netdev(entry->netdev); |
| 913 | |
| 914 | /* The entry pointer is deleted in device_event() */ |
| 915 | } |
| 916 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 917 | static void chan_close_cb(struct l2cap_chan *chan) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 918 | { |
| 919 | struct lowpan_dev *entry, *tmp; |
| 920 | struct lowpan_dev *dev = NULL; |
| 921 | struct lowpan_peer *peer; |
| 922 | int err = -ENOENT; |
| 923 | unsigned long flags; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 924 | bool last = false, removed = true; |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 925 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 926 | BT_DBG("chan %p conn %p", chan, chan->conn); |
| 927 | |
| 928 | if (chan->conn && chan->conn->hcon) { |
| 929 | if (!is_bt_6lowpan(chan->conn->hcon)) |
| 930 | return; |
| 931 | |
| 932 | /* If conn is set, then the netdev is also there and we should |
| 933 | * not remove it. |
| 934 | */ |
| 935 | removed = false; |
| 936 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 937 | |
| 938 | write_lock_irqsave(&devices_lock, flags); |
| 939 | |
| 940 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) { |
| 941 | dev = lowpan_dev(entry->netdev); |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 942 | peer = peer_lookup_chan(dev, chan); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 943 | if (peer) { |
| 944 | last = peer_del(dev, peer); |
| 945 | err = 0; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 946 | |
| 947 | BT_DBG("dev %p removing %speer %p", dev, |
| 948 | last ? "last " : "1 ", peer); |
| 949 | BT_DBG("chan %p orig refcnt %d", chan, |
| 950 | atomic_read(&chan->kref.refcount)); |
| 951 | |
| 952 | l2cap_chan_put(chan); |
| 953 | kfree(peer); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 954 | break; |
| 955 | } |
| 956 | } |
| 957 | |
| 958 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { |
| 959 | write_unlock_irqrestore(&devices_lock, flags); |
| 960 | |
| 961 | cancel_delayed_work_sync(&dev->notify_peers); |
| 962 | |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 963 | ifdown(dev->netdev); |
| 964 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 965 | if (!removed) { |
| 966 | INIT_WORK(&entry->delete_netdev, delete_netdev); |
| 967 | schedule_work(&entry->delete_netdev); |
| 968 | } |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 969 | } else { |
| 970 | write_unlock_irqrestore(&devices_lock, flags); |
| 971 | } |
| 972 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 973 | return; |
| 974 | } |
| 975 | |
| 976 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) |
| 977 | { |
| 978 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, |
| 979 | state_to_string(state), err); |
| 980 | } |
| 981 | |
| 982 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, |
| 983 | unsigned long hdr_len, |
| 984 | unsigned long len, int nb) |
| 985 | { |
| 986 | /* Note that we must allocate using GFP_ATOMIC here as |
| 987 | * this function is called originally from netdev hard xmit |
| 988 | * function in atomic context. |
| 989 | */ |
| 990 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); |
| 991 | } |
| 992 | |
| 993 | static void chan_suspend_cb(struct l2cap_chan *chan) |
| 994 | { |
| 995 | struct sk_buff *skb = chan->data; |
| 996 | |
| 997 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); |
| 998 | |
Jukka Rissanen | 59790aa | 2014-09-29 10:55:46 +0300 | [diff] [blame] | 999 | if (!skb) |
| 1000 | return; |
| 1001 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1002 | lowpan_cb(skb)->status = -EAGAIN; |
| 1003 | } |
| 1004 | |
| 1005 | static void chan_resume_cb(struct l2cap_chan *chan) |
| 1006 | { |
| 1007 | struct sk_buff *skb = chan->data; |
| 1008 | |
| 1009 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); |
| 1010 | |
Jukka Rissanen | 59790aa | 2014-09-29 10:55:46 +0300 | [diff] [blame] | 1011 | if (!skb) |
| 1012 | return; |
| 1013 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1014 | lowpan_cb(skb)->status = 0; |
| 1015 | } |
| 1016 | |
| 1017 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) |
| 1018 | { |
Jukka Rissanen | 2ae50d8 | 2014-09-08 12:11:43 +0300 | [diff] [blame] | 1019 | return L2CAP_CONN_TIMEOUT; |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1020 | } |
| 1021 | |
| 1022 | static const struct l2cap_ops bt_6lowpan_chan_ops = { |
| 1023 | .name = "L2CAP 6LoWPAN channel", |
| 1024 | .new_connection = chan_new_conn_cb, |
| 1025 | .recv = chan_recv_cb, |
| 1026 | .close = chan_close_cb, |
| 1027 | .state_change = chan_state_change_cb, |
| 1028 | .ready = chan_ready_cb, |
| 1029 | .resume = chan_resume_cb, |
| 1030 | .suspend = chan_suspend_cb, |
| 1031 | .get_sndtimeo = chan_get_sndtimeo_cb, |
| 1032 | .alloc_skb = chan_alloc_skb_cb, |
| 1033 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, |
| 1034 | |
| 1035 | .teardown = l2cap_chan_no_teardown, |
| 1036 | .defer = l2cap_chan_no_defer, |
| 1037 | .set_shutdown = l2cap_chan_no_set_shutdown, |
| 1038 | }; |
| 1039 | |
| 1040 | static inline __u8 bdaddr_type(__u8 type) |
| 1041 | { |
| 1042 | if (type == ADDR_LE_DEV_PUBLIC) |
| 1043 | return BDADDR_LE_PUBLIC; |
| 1044 | else |
| 1045 | return BDADDR_LE_RANDOM; |
| 1046 | } |
| 1047 | |
| 1048 | static struct l2cap_chan *chan_get(void) |
| 1049 | { |
| 1050 | struct l2cap_chan *pchan; |
| 1051 | |
| 1052 | pchan = chan_create(); |
| 1053 | if (!pchan) |
| 1054 | return NULL; |
| 1055 | |
| 1056 | pchan->ops = &bt_6lowpan_chan_ops; |
| 1057 | |
| 1058 | return pchan; |
| 1059 | } |
| 1060 | |
| 1061 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) |
| 1062 | { |
| 1063 | struct l2cap_chan *pchan; |
| 1064 | int err; |
| 1065 | |
| 1066 | pchan = chan_get(); |
| 1067 | if (!pchan) |
| 1068 | return -EINVAL; |
| 1069 | |
| 1070 | err = l2cap_chan_connect(pchan, cpu_to_le16(psm_6lowpan), 0, |
| 1071 | addr, dst_type); |
| 1072 | |
| 1073 | BT_DBG("chan %p err %d", pchan, err); |
| 1074 | if (err < 0) |
| 1075 | l2cap_chan_put(pchan); |
| 1076 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1077 | return err; |
| 1078 | } |
| 1079 | |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1080 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) |
| 1081 | { |
| 1082 | struct lowpan_peer *peer; |
| 1083 | |
| 1084 | BT_DBG("conn %p dst type %d", conn, dst_type); |
| 1085 | |
| 1086 | peer = lookup_peer(conn); |
| 1087 | if (!peer) |
| 1088 | return -ENOENT; |
| 1089 | |
| 1090 | BT_DBG("peer %p chan %p", peer, peer->chan); |
| 1091 | |
| 1092 | l2cap_chan_close(peer->chan, ENOENT); |
| 1093 | |
| 1094 | return 0; |
| 1095 | } |
| 1096 | |
| 1097 | static struct l2cap_chan *bt_6lowpan_listen(void) |
| 1098 | { |
| 1099 | bdaddr_t *addr = BDADDR_ANY; |
| 1100 | struct l2cap_chan *pchan; |
| 1101 | int err; |
| 1102 | |
| 1103 | if (psm_6lowpan == 0) |
| 1104 | return NULL; |
| 1105 | |
| 1106 | pchan = chan_get(); |
| 1107 | if (!pchan) |
| 1108 | return NULL; |
| 1109 | |
| 1110 | pchan->state = BT_LISTEN; |
| 1111 | pchan->src_type = BDADDR_LE_PUBLIC; |
| 1112 | |
| 1113 | BT_DBG("psm 0x%04x chan %p src type %d", psm_6lowpan, pchan, |
| 1114 | pchan->src_type); |
| 1115 | |
| 1116 | err = l2cap_add_psm(pchan, addr, cpu_to_le16(psm_6lowpan)); |
| 1117 | if (err) { |
| 1118 | l2cap_chan_put(pchan); |
| 1119 | BT_ERR("psm cannot be added err %d", err); |
| 1120 | return NULL; |
| 1121 | } |
| 1122 | |
| 1123 | return pchan; |
| 1124 | } |
| 1125 | |
| 1126 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, |
| 1127 | struct l2cap_conn **conn) |
| 1128 | { |
| 1129 | struct hci_conn *hcon; |
| 1130 | struct hci_dev *hdev; |
| 1131 | bdaddr_t *src = BDADDR_ANY; |
| 1132 | int n; |
| 1133 | |
| 1134 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", |
| 1135 | &addr->b[5], &addr->b[4], &addr->b[3], |
| 1136 | &addr->b[2], &addr->b[1], &addr->b[0], |
| 1137 | addr_type); |
| 1138 | |
| 1139 | if (n < 7) |
| 1140 | return -EINVAL; |
| 1141 | |
| 1142 | hdev = hci_get_route(addr, src); |
| 1143 | if (!hdev) |
| 1144 | return -ENOENT; |
| 1145 | |
| 1146 | hci_dev_lock(hdev); |
| 1147 | hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr); |
| 1148 | hci_dev_unlock(hdev); |
| 1149 | |
| 1150 | if (!hcon) |
| 1151 | return -ENOENT; |
| 1152 | |
| 1153 | *conn = (struct l2cap_conn *)hcon->l2cap_data; |
| 1154 | |
| 1155 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); |
| 1156 | |
| 1157 | return 0; |
| 1158 | } |
| 1159 | |
| 1160 | static void disconnect_all_peers(void) |
| 1161 | { |
| 1162 | struct lowpan_dev *entry, *tmp_dev; |
| 1163 | struct lowpan_peer *peer, *tmp_peer, *new_peer; |
| 1164 | struct list_head peers; |
| 1165 | unsigned long flags; |
| 1166 | |
| 1167 | INIT_LIST_HEAD(&peers); |
| 1168 | |
| 1169 | /* We make a separate list of peers as the close_cb() will |
| 1170 | * modify the device peers list so it is better not to mess |
| 1171 | * with the same list at the same time. |
| 1172 | */ |
| 1173 | |
| 1174 | read_lock_irqsave(&devices_lock, flags); |
| 1175 | |
| 1176 | list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) { |
| 1177 | list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list) { |
| 1178 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); |
| 1179 | if (!new_peer) |
| 1180 | break; |
| 1181 | |
| 1182 | new_peer->chan = peer->chan; |
| 1183 | INIT_LIST_HEAD(&new_peer->list); |
| 1184 | |
| 1185 | list_add(&new_peer->list, &peers); |
| 1186 | } |
| 1187 | } |
| 1188 | |
| 1189 | read_unlock_irqrestore(&devices_lock, flags); |
| 1190 | |
| 1191 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { |
| 1192 | l2cap_chan_close(peer->chan, ENOENT); |
| 1193 | kfree(peer); |
| 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | static int lowpan_psm_set(void *data, u64 val) |
| 1198 | { |
| 1199 | u16 psm; |
| 1200 | |
| 1201 | psm = val; |
| 1202 | if (psm == 0 || psm_6lowpan != psm) |
| 1203 | /* Disconnect existing connections if 6lowpan is |
| 1204 | * disabled (psm = 0), or if psm changes. |
| 1205 | */ |
| 1206 | disconnect_all_peers(); |
| 1207 | |
| 1208 | psm_6lowpan = psm; |
| 1209 | |
| 1210 | if (listen_chan) { |
| 1211 | l2cap_chan_close(listen_chan, 0); |
| 1212 | l2cap_chan_put(listen_chan); |
| 1213 | } |
| 1214 | |
| 1215 | listen_chan = bt_6lowpan_listen(); |
| 1216 | |
| 1217 | return 0; |
| 1218 | } |
| 1219 | |
| 1220 | static int lowpan_psm_get(void *data, u64 *val) |
| 1221 | { |
| 1222 | *val = psm_6lowpan; |
| 1223 | return 0; |
| 1224 | } |
| 1225 | |
| 1226 | DEFINE_SIMPLE_ATTRIBUTE(lowpan_psm_fops, lowpan_psm_get, |
| 1227 | lowpan_psm_set, "%llu\n"); |
| 1228 | |
| 1229 | static ssize_t lowpan_control_write(struct file *fp, |
| 1230 | const char __user *user_buffer, |
| 1231 | size_t count, |
| 1232 | loff_t *position) |
| 1233 | { |
| 1234 | char buf[32]; |
| 1235 | size_t buf_size = min(count, sizeof(buf) - 1); |
| 1236 | int ret; |
| 1237 | bdaddr_t addr; |
| 1238 | u8 addr_type; |
| 1239 | struct l2cap_conn *conn = NULL; |
| 1240 | |
| 1241 | if (copy_from_user(buf, user_buffer, buf_size)) |
| 1242 | return -EFAULT; |
| 1243 | |
| 1244 | buf[buf_size] = '\0'; |
| 1245 | |
| 1246 | if (memcmp(buf, "connect ", 8) == 0) { |
| 1247 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); |
| 1248 | if (ret == -EINVAL) |
| 1249 | return ret; |
| 1250 | |
| 1251 | if (listen_chan) { |
| 1252 | l2cap_chan_close(listen_chan, 0); |
| 1253 | l2cap_chan_put(listen_chan); |
| 1254 | listen_chan = NULL; |
| 1255 | } |
| 1256 | |
| 1257 | if (conn) { |
| 1258 | struct lowpan_peer *peer; |
| 1259 | |
| 1260 | if (!is_bt_6lowpan(conn->hcon)) |
| 1261 | return -EINVAL; |
| 1262 | |
| 1263 | peer = lookup_peer(conn); |
| 1264 | if (peer) { |
| 1265 | BT_DBG("6LoWPAN connection already exists"); |
| 1266 | return -EALREADY; |
| 1267 | } |
| 1268 | |
| 1269 | BT_DBG("conn %p dst %pMR type %d user %d", conn, |
| 1270 | &conn->hcon->dst, conn->hcon->dst_type, |
| 1271 | addr_type); |
| 1272 | } |
| 1273 | |
| 1274 | ret = bt_6lowpan_connect(&addr, addr_type); |
| 1275 | if (ret < 0) |
| 1276 | return ret; |
| 1277 | |
| 1278 | return count; |
| 1279 | } |
| 1280 | |
| 1281 | if (memcmp(buf, "disconnect ", 11) == 0) { |
| 1282 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); |
| 1283 | if (ret < 0) |
| 1284 | return ret; |
| 1285 | |
| 1286 | ret = bt_6lowpan_disconnect(conn, addr_type); |
| 1287 | if (ret < 0) |
| 1288 | return ret; |
| 1289 | |
| 1290 | return count; |
| 1291 | } |
| 1292 | |
| 1293 | return count; |
| 1294 | } |
| 1295 | |
| 1296 | static int lowpan_control_show(struct seq_file *f, void *ptr) |
| 1297 | { |
| 1298 | struct lowpan_dev *entry, *tmp_dev; |
| 1299 | struct lowpan_peer *peer, *tmp_peer; |
| 1300 | unsigned long flags; |
| 1301 | |
| 1302 | read_lock_irqsave(&devices_lock, flags); |
| 1303 | |
| 1304 | list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) { |
| 1305 | list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list) |
| 1306 | seq_printf(f, "%pMR (type %u)\n", |
| 1307 | &peer->chan->dst, peer->chan->dst_type); |
| 1308 | } |
| 1309 | |
| 1310 | read_unlock_irqrestore(&devices_lock, flags); |
| 1311 | |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
| 1315 | static int lowpan_control_open(struct inode *inode, struct file *file) |
| 1316 | { |
| 1317 | return single_open(file, lowpan_control_show, inode->i_private); |
| 1318 | } |
| 1319 | |
| 1320 | static const struct file_operations lowpan_control_fops = { |
| 1321 | .open = lowpan_control_open, |
| 1322 | .read = seq_read, |
| 1323 | .write = lowpan_control_write, |
| 1324 | .llseek = seq_lseek, |
| 1325 | .release = single_release, |
| 1326 | }; |
| 1327 | |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1328 | static void disconnect_devices(void) |
| 1329 | { |
| 1330 | struct lowpan_dev *entry, *tmp, *new_dev; |
| 1331 | struct list_head devices; |
| 1332 | unsigned long flags; |
| 1333 | |
| 1334 | INIT_LIST_HEAD(&devices); |
| 1335 | |
| 1336 | /* We make a separate list of devices because the unregister_netdev() |
| 1337 | * will call device_event() which will also want to modify the same |
| 1338 | * devices list. |
| 1339 | */ |
| 1340 | |
| 1341 | read_lock_irqsave(&devices_lock, flags); |
| 1342 | |
| 1343 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) { |
| 1344 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); |
| 1345 | if (!new_dev) |
| 1346 | break; |
| 1347 | |
| 1348 | new_dev->netdev = entry->netdev; |
| 1349 | INIT_LIST_HEAD(&new_dev->list); |
| 1350 | |
| 1351 | list_add(&new_dev->list, &devices); |
| 1352 | } |
| 1353 | |
| 1354 | read_unlock_irqrestore(&devices_lock, flags); |
| 1355 | |
| 1356 | list_for_each_entry_safe(entry, tmp, &devices, list) { |
| 1357 | ifdown(entry->netdev); |
| 1358 | BT_DBG("Unregistering netdev %s %p", |
| 1359 | entry->netdev->name, entry->netdev); |
| 1360 | unregister_netdev(entry->netdev); |
| 1361 | kfree(entry); |
| 1362 | } |
| 1363 | } |
| 1364 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1365 | static int device_event(struct notifier_block *unused, |
| 1366 | unsigned long event, void *ptr) |
| 1367 | { |
| 1368 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); |
| 1369 | struct lowpan_dev *entry, *tmp; |
| 1370 | unsigned long flags; |
| 1371 | |
| 1372 | if (netdev->type != ARPHRD_6LOWPAN) |
| 1373 | return NOTIFY_DONE; |
| 1374 | |
| 1375 | switch (event) { |
| 1376 | case NETDEV_UNREGISTER: |
| 1377 | write_lock_irqsave(&devices_lock, flags); |
| 1378 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, |
| 1379 | list) { |
| 1380 | if (entry->netdev == netdev) { |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1381 | BT_DBG("Unregistered netdev %s %p", |
| 1382 | netdev->name, netdev); |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1383 | list_del(&entry->list); |
| 1384 | kfree(entry); |
| 1385 | break; |
| 1386 | } |
| 1387 | } |
| 1388 | write_unlock_irqrestore(&devices_lock, flags); |
| 1389 | break; |
| 1390 | } |
| 1391 | |
| 1392 | return NOTIFY_DONE; |
| 1393 | } |
| 1394 | |
| 1395 | static struct notifier_block bt_6lowpan_dev_notifier = { |
| 1396 | .notifier_call = device_event, |
| 1397 | }; |
| 1398 | |
Jukka Rissanen | 5547e48 | 2014-06-18 16:37:09 +0300 | [diff] [blame] | 1399 | static int __init bt_6lowpan_init(void) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1400 | { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1401 | lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644, |
| 1402 | bt_debugfs, NULL, |
| 1403 | &lowpan_psm_fops); |
| 1404 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, |
| 1405 | bt_debugfs, NULL, |
| 1406 | &lowpan_control_fops); |
| 1407 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1408 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
| 1409 | } |
| 1410 | |
Jukka Rissanen | 5547e48 | 2014-06-18 16:37:09 +0300 | [diff] [blame] | 1411 | static void __exit bt_6lowpan_exit(void) |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1412 | { |
Jukka Rissanen | 6b8d4a6 | 2014-06-18 16:37:08 +0300 | [diff] [blame] | 1413 | debugfs_remove(lowpan_psm_debugfs); |
| 1414 | debugfs_remove(lowpan_control_debugfs); |
| 1415 | |
| 1416 | if (listen_chan) { |
| 1417 | l2cap_chan_close(listen_chan, 0); |
| 1418 | l2cap_chan_put(listen_chan); |
| 1419 | } |
| 1420 | |
Jukka Rissanen | 7f11825 | 2014-06-18 16:37:11 +0300 | [diff] [blame] | 1421 | disconnect_devices(); |
| 1422 | |
Jukka Rissanen | 18722c2 | 2013-12-11 17:05:37 +0200 | [diff] [blame] | 1423 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
| 1424 | } |
Jukka Rissanen | 5547e48 | 2014-06-18 16:37:09 +0300 | [diff] [blame] | 1425 | |
| 1426 | module_init(bt_6lowpan_init); |
| 1427 | module_exit(bt_6lowpan_exit); |
| 1428 | |
| 1429 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); |
| 1430 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); |
| 1431 | MODULE_VERSION(VERSION); |
| 1432 | MODULE_LICENSE("GPL"); |