blob: 9aac5aee157548d663114661d945a3188611f0d4 [file] [log] [blame]
Sergey Lapin9ec76712009-06-08 12:18:48 +00001/*
2 * ZigBee socket interface
3 *
4 * Copyright 2007, 2008 Siemens AG
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Written by:
20 * Sergey Lapin <slapin@ossfans.org>
21 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
22 */
23
24#include <linux/net.h>
25#include <linux/module.h>
26#include <linux/if_arp.h>
27#include <linux/list.h>
28#include <net/sock.h>
Dmitry Eremin-Solenikovf0166e52009-07-23 16:56:29 +040029#include <net/af_ieee802154.h>
30#include <net/ieee802154.h>
31#include <net/ieee802154_netdev.h>
Sergey Lapin9ec76712009-06-08 12:18:48 +000032
33#include <asm/ioctls.h>
34
35#include "af802154.h"
36
37static HLIST_HEAD(dgram_head);
38static DEFINE_RWLOCK(dgram_lock);
39
40struct dgram_sock {
41 struct sock sk;
42
Sergey Lapin9ec76712009-06-08 12:18:48 +000043 struct ieee802154_addr src_addr;
44 struct ieee802154_addr dst_addr;
Dmitry Baryshkov74eda552009-08-07 02:58:42 +000045
46 unsigned bound:1;
Dmitry Baryshkov99eb8552009-08-07 02:58:43 +000047 unsigned want_ack:1;
Sergey Lapin9ec76712009-06-08 12:18:48 +000048};
49
50static inline struct dgram_sock *dgram_sk(const struct sock *sk)
51{
52 return container_of(sk, struct dgram_sock, sk);
53}
54
Sergey Lapin9ec76712009-06-08 12:18:48 +000055static void dgram_hash(struct sock *sk)
56{
57 write_lock_bh(&dgram_lock);
58 sk_add_node(sk, &dgram_head);
59 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
60 write_unlock_bh(&dgram_lock);
61}
62
63static void dgram_unhash(struct sock *sk)
64{
65 write_lock_bh(&dgram_lock);
66 if (sk_del_node_init(sk))
67 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
68 write_unlock_bh(&dgram_lock);
69}
70
71static int dgram_init(struct sock *sk)
72{
73 struct dgram_sock *ro = dgram_sk(sk);
74
75 ro->dst_addr.addr_type = IEEE802154_ADDR_LONG;
76 ro->dst_addr.pan_id = 0xffff;
Dmitry Baryshkov99eb8552009-08-07 02:58:43 +000077 ro->want_ack = 1;
Sergey Lapin9ec76712009-06-08 12:18:48 +000078 memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr));
79 return 0;
80}
81
82static void dgram_close(struct sock *sk, long timeout)
83{
84 sk_common_release(sk);
85}
86
87static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
88{
89 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
90 struct dgram_sock *ro = dgram_sk(sk);
Dmitry Baryshkov74eda552009-08-07 02:58:42 +000091 int err = -EINVAL;
Sergey Lapin9ec76712009-06-08 12:18:48 +000092 struct net_device *dev;
93
Dmitry Baryshkov74eda552009-08-07 02:58:42 +000094 lock_sock(sk);
95
Sergey Lapin9ec76712009-06-08 12:18:48 +000096 ro->bound = 0;
97
98 if (len < sizeof(*addr))
Dmitry Baryshkov74eda552009-08-07 02:58:42 +000099 goto out;
Sergey Lapin9ec76712009-06-08 12:18:48 +0000100
101 if (addr->family != AF_IEEE802154)
Dmitry Baryshkov74eda552009-08-07 02:58:42 +0000102 goto out;
Sergey Lapin9ec76712009-06-08 12:18:48 +0000103
104 dev = ieee802154_get_dev(sock_net(sk), &addr->addr);
105 if (!dev) {
106 err = -ENODEV;
107 goto out;
108 }
109
110 if (dev->type != ARPHRD_IEEE802154) {
111 err = -ENODEV;
112 goto out_put;
113 }
114
115 memcpy(&ro->src_addr, &addr->addr, sizeof(struct ieee802154_addr));
116
117 ro->bound = 1;
Dmitry Baryshkov74eda552009-08-07 02:58:42 +0000118 err = 0;
Sergey Lapin9ec76712009-06-08 12:18:48 +0000119out_put:
120 dev_put(dev);
121out:
122 release_sock(sk);
123
124 return err;
125}
126
127static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
128{
129 switch (cmd) {
130 case SIOCOUTQ:
131 {
Eric Dumazet31e6d362009-06-17 19:05:41 -0700132 int amount = sk_wmem_alloc_get(sk);
133
Sergey Lapin9ec76712009-06-08 12:18:48 +0000134 return put_user(amount, (int __user *)arg);
135 }
136
137 case SIOCINQ:
138 {
139 struct sk_buff *skb;
140 unsigned long amount;
141
142 amount = 0;
143 spin_lock_bh(&sk->sk_receive_queue.lock);
144 skb = skb_peek(&sk->sk_receive_queue);
145 if (skb != NULL) {
146 /*
147 * We will only return the amount
148 * of this packet since that is all
149 * that will be read.
150 */
151 /* FIXME: parse the header for more correct value */
152 amount = skb->len - (3+8+8);
153 }
154 spin_unlock_bh(&sk->sk_receive_queue.lock);
155 return put_user(amount, (int __user *)arg);
156 }
157
158 }
159 return -ENOIOCTLCMD;
160}
161
162/* FIXME: autobind */
163static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
164 int len)
165{
166 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
167 struct dgram_sock *ro = dgram_sk(sk);
168 int err = 0;
169
170 if (len < sizeof(*addr))
171 return -EINVAL;
172
173 if (addr->family != AF_IEEE802154)
174 return -EINVAL;
175
176 lock_sock(sk);
177
178 if (!ro->bound) {
179 err = -ENETUNREACH;
180 goto out;
181 }
182
183 memcpy(&ro->dst_addr, &addr->addr, sizeof(struct ieee802154_addr));
184
185out:
186 release_sock(sk);
187 return err;
188}
189
190static int dgram_disconnect(struct sock *sk, int flags)
191{
192 struct dgram_sock *ro = dgram_sk(sk);
193
194 lock_sock(sk);
195
196 ro->dst_addr.addr_type = IEEE802154_ADDR_LONG;
197 memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr));
198
199 release_sock(sk);
200
201 return 0;
202}
203
204static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
205 struct msghdr *msg, size_t size)
206{
207 struct net_device *dev;
208 unsigned mtu;
209 struct sk_buff *skb;
210 struct dgram_sock *ro = dgram_sk(sk);
211 int err;
212
213 if (msg->msg_flags & MSG_OOB) {
214 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
215 return -EOPNOTSUPP;
216 }
217
218 if (!ro->bound)
219 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
220 else
221 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
222
223 if (!dev) {
224 pr_debug("no dev\n");
225 err = -ENXIO;
226 goto out;
227 }
228 mtu = dev->mtu;
229 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
230
231 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size,
232 msg->msg_flags & MSG_DONTWAIT,
233 &err);
234 if (!skb)
235 goto out_dev;
236
237 skb_reserve(skb, LL_RESERVED_SPACE(dev));
238
239 skb_reset_network_header(skb);
240
Dmitry Baryshkov99eb8552009-08-07 02:58:43 +0000241 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
242 if (ro->want_ack)
243 mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
244
Sergey Lapin9ec76712009-06-08 12:18:48 +0000245 mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
246 err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr,
247 ro->bound ? &ro->src_addr : NULL, size);
248 if (err < 0)
249 goto out_skb;
250
251 skb_reset_mac_header(skb);
252
253 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
254 if (err < 0)
255 goto out_skb;
256
257 if (size > mtu) {
David S. Millere5241c42009-06-11 02:10:19 -0700258 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
Sergey Lapin9ec76712009-06-08 12:18:48 +0000259 err = -EINVAL;
260 goto out_skb;
261 }
262
263 skb->dev = dev;
264 skb->sk = sk;
265 skb->protocol = htons(ETH_P_IEEE802154);
266
267 dev_put(dev);
268
269 err = dev_queue_xmit(skb);
270 if (err > 0)
271 err = net_xmit_errno(err);
272
273 return err ?: size;
274
275out_skb:
276 kfree_skb(skb);
277out_dev:
278 dev_put(dev);
279out:
280 return err;
281}
282
283static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
284 struct msghdr *msg, size_t len, int noblock, int flags,
285 int *addr_len)
286{
287 size_t copied = 0;
288 int err = -EOPNOTSUPP;
289 struct sk_buff *skb;
290
291 skb = skb_recv_datagram(sk, flags, noblock, &err);
292 if (!skb)
293 goto out;
294
295 copied = skb->len;
296 if (len < copied) {
297 msg->msg_flags |= MSG_TRUNC;
298 copied = len;
299 }
300
301 /* FIXME: skip headers if necessary ?! */
302 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
303 if (err)
304 goto done;
305
Neil Horman3b885782009-10-12 13:26:31 -0700306 sock_recv_ts_and_drops(msg, sk, skb);
Sergey Lapin9ec76712009-06-08 12:18:48 +0000307
308 if (flags & MSG_TRUNC)
309 copied = skb->len;
310done:
311 skb_free_datagram(sk, skb);
312out:
313 if (err)
314 return err;
315 return copied;
316}
317
318static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
319{
320 if (sock_queue_rcv_skb(sk, skb) < 0) {
Sergey Lapin9ec76712009-06-08 12:18:48 +0000321 kfree_skb(skb);
322 return NET_RX_DROP;
323 }
324
325 return NET_RX_SUCCESS;
326}
327
328static inline int ieee802154_match_sock(u8 *hw_addr, u16 pan_id,
329 u16 short_addr, struct dgram_sock *ro)
330{
331 if (!ro->bound)
332 return 1;
333
334 if (ro->src_addr.addr_type == IEEE802154_ADDR_LONG &&
335 !memcmp(ro->src_addr.hwaddr, hw_addr, IEEE802154_ADDR_LEN))
336 return 1;
337
338 if (ro->src_addr.addr_type == IEEE802154_ADDR_SHORT &&
339 pan_id == ro->src_addr.pan_id &&
340 short_addr == ro->src_addr.short_addr)
341 return 1;
342
343 return 0;
344}
345
346int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
347{
348 struct sock *sk, *prev = NULL;
349 struct hlist_node *node;
350 int ret = NET_RX_SUCCESS;
351 u16 pan_id, short_addr;
352
353 /* Data frame processing */
354 BUG_ON(dev->type != ARPHRD_IEEE802154);
355
356 pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
357 short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
358
359 read_lock(&dgram_lock);
360 sk_for_each(sk, node, &dgram_head) {
361 if (ieee802154_match_sock(dev->dev_addr, pan_id, short_addr,
362 dgram_sk(sk))) {
363 if (prev) {
364 struct sk_buff *clone;
365 clone = skb_clone(skb, GFP_ATOMIC);
366 if (clone)
367 dgram_rcv_skb(prev, clone);
368 }
369
370 prev = sk;
371 }
372 }
373
374 if (prev)
375 dgram_rcv_skb(prev, skb);
376 else {
377 kfree_skb(skb);
378 ret = NET_RX_DROP;
379 }
380 read_unlock(&dgram_lock);
381
382 return ret;
383}
384
Dmitry Eremin-Solenikova9dfac32009-08-03 17:53:00 +0400385static int dgram_getsockopt(struct sock *sk, int level, int optname,
386 char __user *optval, int __user *optlen)
387{
Dmitry Baryshkov99eb8552009-08-07 02:58:43 +0000388 struct dgram_sock *ro = dgram_sk(sk);
389
390 int val, len;
391
392 if (level != SOL_IEEE802154)
393 return -EOPNOTSUPP;
394
395 if (get_user(len, optlen))
396 return -EFAULT;
397
398 len = min_t(unsigned int, len, sizeof(int));
399
400 switch (optname) {
401 case WPAN_WANTACK:
402 val = ro->want_ack;
403 break;
404 default:
405 return -ENOPROTOOPT;
406 }
407
408 if (put_user(len, optlen))
409 return -EFAULT;
410 if (copy_to_user(optval, &val, len))
411 return -EFAULT;
412 return 0;
Dmitry Eremin-Solenikova9dfac32009-08-03 17:53:00 +0400413}
414
415static int dgram_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700416 char __user *optval, unsigned int optlen)
Dmitry Eremin-Solenikova9dfac32009-08-03 17:53:00 +0400417{
Dmitry Baryshkov99eb8552009-08-07 02:58:43 +0000418 struct dgram_sock *ro = dgram_sk(sk);
419 int val;
420 int err = 0;
421
422 if (optlen < sizeof(int))
423 return -EINVAL;
424
425 if (get_user(val, (int __user *)optval))
426 return -EFAULT;
427
428 lock_sock(sk);
429
430 switch (optname) {
431 case WPAN_WANTACK:
432 ro->want_ack = !!val;
433 break;
434 default:
435 err = -ENOPROTOOPT;
436 break;
437 }
438
439 release_sock(sk);
440 return err;
Dmitry Eremin-Solenikova9dfac32009-08-03 17:53:00 +0400441}
442
Sergey Lapin9ec76712009-06-08 12:18:48 +0000443struct proto ieee802154_dgram_prot = {
444 .name = "IEEE-802.15.4-MAC",
445 .owner = THIS_MODULE,
446 .obj_size = sizeof(struct dgram_sock),
447 .init = dgram_init,
448 .close = dgram_close,
449 .bind = dgram_bind,
450 .sendmsg = dgram_sendmsg,
451 .recvmsg = dgram_recvmsg,
452 .hash = dgram_hash,
453 .unhash = dgram_unhash,
454 .connect = dgram_connect,
455 .disconnect = dgram_disconnect,
456 .ioctl = dgram_ioctl,
Dmitry Eremin-Solenikova9dfac32009-08-03 17:53:00 +0400457 .getsockopt = dgram_getsockopt,
458 .setsockopt = dgram_setsockopt,
Sergey Lapin9ec76712009-06-08 12:18:48 +0000459};
460