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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>
29#include <net/af_ieee802154.h>
30#include <net/ieee802154.h>
31#include <net/ieee802154_netdev.h>
32
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
43 struct ieee802154_addr src_addr;
44 struct ieee802154_addr dst_addr;
45
46 unsigned bound:1;
47 unsigned want_ack:1;
48};
49
50static inline struct dgram_sock *dgram_sk(const struct sock *sk)
51{
52 return container_of(sk, struct dgram_sock, sk);
53}
54
55static 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;
77 ro->want_ack = 1;
78 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);
91 int err = -EINVAL;
92 struct net_device *dev;
93
94 lock_sock(sk);
95
96 ro->bound = 0;
97
98 if (len < sizeof(*addr))
99 goto out;
100
101 if (addr->family != AF_IEEE802154)
102 goto out;
103
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;
118 err = 0;
119out_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 {
132 int amount = sk_wmem_alloc_get(sk);
133
134 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
148
149
150
151
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
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
241 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
242 if (ro->want_ack)
243 mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
244
245 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) {
258 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
259 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
302 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
303 if (err)
304 goto done;
305
306 sock_recv_timestamp(msg, sk, skb);
307
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) {
321 atomic_inc(&sk->sk_drops);
322 kfree_skb(skb);
323 return NET_RX_DROP;
324 }
325
326 return NET_RX_SUCCESS;
327}
328
329static inline int ieee802154_match_sock(u8 *hw_addr, u16 pan_id,
330 u16 short_addr, struct dgram_sock *ro)
331{
332 if (!ro->bound)
333 return 1;
334
335 if (ro->src_addr.addr_type == IEEE802154_ADDR_LONG &&
336 !memcmp(ro->src_addr.hwaddr, hw_addr, IEEE802154_ADDR_LEN))
337 return 1;
338
339 if (ro->src_addr.addr_type == IEEE802154_ADDR_SHORT &&
340 pan_id == ro->src_addr.pan_id &&
341 short_addr == ro->src_addr.short_addr)
342 return 1;
343
344 return 0;
345}
346
347int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
348{
349 struct sock *sk, *prev = NULL;
350 struct hlist_node *node;
351 int ret = NET_RX_SUCCESS;
352 u16 pan_id, short_addr;
353
354
355 BUG_ON(dev->type != ARPHRD_IEEE802154);
356
357 pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
358 short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
359
360 read_lock(&dgram_lock);
361 sk_for_each(sk, node, &dgram_head) {
362 if (ieee802154_match_sock(dev->dev_addr, pan_id, short_addr,
363 dgram_sk(sk))) {
364 if (prev) {
365 struct sk_buff *clone;
366 clone = skb_clone(skb, GFP_ATOMIC);
367 if (clone)
368 dgram_rcv_skb(prev, clone);
369 }
370
371 prev = sk;
372 }
373 }
374
375 if (prev)
376 dgram_rcv_skb(prev, skb);
377 else {
378 kfree_skb(skb);
379 ret = NET_RX_DROP;
380 }
381 read_unlock(&dgram_lock);
382
383 return ret;
384}
385
386static int dgram_getsockopt(struct sock *sk, int level, int optname,
387 char __user *optval, int __user *optlen)
388{
389 struct dgram_sock *ro = dgram_sk(sk);
390
391 int val, len;
392
393 if (level != SOL_IEEE802154)
394 return -EOPNOTSUPP;
395
396 if (get_user(len, optlen))
397 return -EFAULT;
398
399 len = min_t(unsigned int, len, sizeof(int));
400
401 switch (optname) {
402 case WPAN_WANTACK:
403 val = ro->want_ack;
404 break;
405 default:
406 return -ENOPROTOOPT;
407 }
408
409 if (put_user(len, optlen))
410 return -EFAULT;
411 if (copy_to_user(optval, &val, len))
412 return -EFAULT;
413 return 0;
414}
415
416static int dgram_setsockopt(struct sock *sk, int level, int optname,
417 char __user *optval, unsigned int optlen)
418{
419 struct dgram_sock *ro = dgram_sk(sk);
420 int val;
421 int err = 0;
422
423 if (optlen < sizeof(int))
424 return -EINVAL;
425
426 if (get_user(val, (int __user *)optval))
427 return -EFAULT;
428
429 lock_sock(sk);
430
431 switch (optname) {
432 case WPAN_WANTACK:
433 ro->want_ack = !!val;
434 break;
435 default:
436 err = -ENOPROTOOPT;
437 break;
438 }
439
440 release_sock(sk);
441 return err;
442}
443
444struct proto ieee802154_dgram_prot = {
445 .name = "IEEE-802.15.4-MAC",
446 .owner = THIS_MODULE,
447 .obj_size = sizeof(struct dgram_sock),
448 .init = dgram_init,
449 .close = dgram_close,
450 .bind = dgram_bind,
451 .sendmsg = dgram_sendmsg,
452 .recvmsg = dgram_recvmsg,
453 .hash = dgram_hash,
454 .unhash = dgram_unhash,
455 .connect = dgram_connect,
456 .disconnect = dgram_disconnect,
457 .ioctl = dgram_ioctl,
458 .getsockopt = dgram_getsockopt,
459 .setsockopt = dgram_setsockopt,
460};
461
462
