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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 <linux/slab.h>
29#include <net/sock.h>
30#include <net/af_ieee802154.h>
31#include <net/ieee802154.h>
32#include <net/ieee802154_netdev.h>
33
34#include <asm/ioctls.h>
35
36#include "af802154.h"
37
38static HLIST_HEAD(dgram_head);
39static DEFINE_RWLOCK(dgram_lock);
40
41struct dgram_sock {
42 struct sock sk;
43
44 struct ieee802154_addr src_addr;
45 struct ieee802154_addr dst_addr;
46
47 unsigned bound:1;
48 unsigned want_ack:1;
49};
50
51static inline struct dgram_sock *dgram_sk(const struct sock *sk)
52{
53 return container_of(sk, struct dgram_sock, sk);
54}
55
56static void dgram_hash(struct sock *sk)
57{
58 write_lock_bh(&dgram_lock);
59 sk_add_node(sk, &dgram_head);
60 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
61 write_unlock_bh(&dgram_lock);
62}
63
64static void dgram_unhash(struct sock *sk)
65{
66 write_lock_bh(&dgram_lock);
67 if (sk_del_node_init(sk))
68 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
69 write_unlock_bh(&dgram_lock);
70}
71
72static int dgram_init(struct sock *sk)
73{
74 struct dgram_sock *ro = dgram_sk(sk);
75
76 ro->dst_addr.addr_type = IEEE802154_ADDR_LONG;
77 ro->dst_addr.pan_id = 0xffff;
78 ro->want_ack = 1;
79 memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr));
80 return 0;
81}
82
83static void dgram_close(struct sock *sk, long timeout)
84{
85 sk_common_release(sk);
86}
87
88static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
89{
90 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
91 struct dgram_sock *ro = dgram_sk(sk);
92 int err = -EINVAL;
93 struct net_device *dev;
94
95 lock_sock(sk);
96
97 ro->bound = 0;
98
99 if (len < sizeof(*addr))
100 goto out;
101
102 if (addr->family != AF_IEEE802154)
103 goto out;
104
105 dev = ieee802154_get_dev(sock_net(sk), &addr->addr);
106 if (!dev) {
107 err = -ENODEV;
108 goto out;
109 }
110
111 if (dev->type != ARPHRD_IEEE802154) {
112 err = -ENODEV;
113 goto out_put;
114 }
115
116 memcpy(&ro->src_addr, &addr->addr, sizeof(struct ieee802154_addr));
117
118 ro->bound = 1;
119 err = 0;
120out_put:
121 dev_put(dev);
122out:
123 release_sock(sk);
124
125 return err;
126}
127
128static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
129{
130 switch (cmd) {
131 case SIOCOUTQ:
132 {
133 int amount = sk_wmem_alloc_get(sk);
134
135 return put_user(amount, (int __user *)arg);
136 }
137
138 case SIOCINQ:
139 {
140 struct sk_buff *skb;
141 unsigned long amount;
142
143 amount = 0;
144 spin_lock_bh(&sk->sk_receive_queue.lock);
145 skb = skb_peek(&sk->sk_receive_queue);
146 if (skb != NULL) {
147
148
149
150
151
152
153 amount = skb->len - (3+8+8);
154 }
155 spin_unlock_bh(&sk->sk_receive_queue.lock);
156 return put_user(amount, (int __user *)arg);
157 }
158
159 }
160 return -ENOIOCTLCMD;
161}
162
163
164static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
165 int len)
166{
167 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
168 struct dgram_sock *ro = dgram_sk(sk);
169 int err = 0;
170
171 if (len < sizeof(*addr))
172 return -EINVAL;
173
174 if (addr->family != AF_IEEE802154)
175 return -EINVAL;
176
177 lock_sock(sk);
178
179 if (!ro->bound) {
180 err = -ENETUNREACH;
181 goto out;
182 }
183
184 memcpy(&ro->dst_addr, &addr->addr, sizeof(struct ieee802154_addr));
185
186out:
187 release_sock(sk);
188 return err;
189}
190
191static int dgram_disconnect(struct sock *sk, int flags)
192{
193 struct dgram_sock *ro = dgram_sk(sk);
194
195 lock_sock(sk);
196
197 ro->dst_addr.addr_type = IEEE802154_ADDR_LONG;
198 memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr));
199
200 release_sock(sk);
201
202 return 0;
203}
204
205static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
206 struct msghdr *msg, size_t size)
207{
208 struct net_device *dev;
209 unsigned mtu;
210 struct sk_buff *skb;
211 struct dgram_sock *ro = dgram_sk(sk);
212 int err;
213
214 if (msg->msg_flags & MSG_OOB) {
215 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
216 return -EOPNOTSUPP;
217 }
218
219 if (!ro->bound)
220 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
221 else
222 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
223
224 if (!dev) {
225 pr_debug("no dev\n");
226 err = -ENXIO;
227 goto out;
228 }
229 mtu = dev->mtu;
230 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
231
232 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size,
233 msg->msg_flags & MSG_DONTWAIT,
234 &err);
235 if (!skb)
236 goto out_dev;
237
238 skb_reserve(skb, LL_RESERVED_SPACE(dev));
239
240 skb_reset_network_header(skb);
241
242 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
243 if (ro->want_ack)
244 mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
245
246 mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
247 err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr,
248 ro->bound ? &ro->src_addr : NULL, size);
249 if (err < 0)
250 goto out_skb;
251
252 skb_reset_mac_header(skb);
253
254 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
255 if (err < 0)
256 goto out_skb;
257
258 if (size > mtu) {
259 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
260 err = -EINVAL;
261 goto out_skb;
262 }
263
264 skb->dev = dev;
265 skb->sk = sk;
266 skb->protocol = htons(ETH_P_IEEE802154);
267
268 dev_put(dev);
269
270 err = dev_queue_xmit(skb);
271 if (err > 0)
272 err = net_xmit_errno(err);
273
274 return err ?: size;
275
276out_skb:
277 kfree_skb(skb);
278out_dev:
279 dev_put(dev);
280out:
281 return err;
282}
283
284static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
285 struct msghdr *msg, size_t len, int noblock, int flags,
286 int *addr_len)
287{
288 size_t copied = 0;
289 int err = -EOPNOTSUPP;
290 struct sk_buff *skb;
291
292 skb = skb_recv_datagram(sk, flags, noblock, &err);
293 if (!skb)
294 goto out;
295
296 copied = skb->len;
297 if (len < copied) {
298 msg->msg_flags |= MSG_TRUNC;
299 copied = len;
300 }
301
302
303 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
304 if (err)
305 goto done;
306
307 sock_recv_ts_and_drops(msg, sk, skb);
308
309 if (flags & MSG_TRUNC)
310 copied = skb->len;
311done:
312 skb_free_datagram(sk, skb);
313out:
314 if (err)
315 return err;
316 return copied;
317}
318
319static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
320{
321 if (sock_queue_rcv_skb(sk, skb) < 0) {
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
