1 /*
2 * Copyright 2007-2012 Siemens AG
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
6 * 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 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Written by:
18 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
19 * Sergey Lapin <slapin@ossfans.org>
20 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
21 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
22 */
23
24 #include <linux/netdevice.h>
25 #include <linux/module.h>
26 #include <linux/if_arp.h>
27
28 #include <net/rtnetlink.h>
29 #include <linux/nl802154.h>
30 #include <net/af_ieee802154.h>
31 #include <net/mac802154.h>
32 #include <net/ieee802154_netdev.h>
33 #include <net/ieee802154.h>
34 #include <net/wpan-phy.h>
35
36 #include "mac802154.h"
37
mac802154_wpan_update_llsec(struct net_device * dev)38 static int mac802154_wpan_update_llsec(struct net_device *dev)
39 {
40 struct mac802154_sub_if_data *priv = netdev_priv(dev);
41 struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
42 int rc = 0;
43
44 if (ops->llsec) {
45 struct ieee802154_llsec_params params;
46 int changed = 0;
47
48 params.pan_id = priv->pan_id;
49 changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
50
51 params.hwaddr = priv->extended_addr;
52 changed |= IEEE802154_LLSEC_PARAM_HWADDR;
53
54 rc = ops->llsec->set_params(dev, ¶ms, changed);
55 }
56
57 return rc;
58 }
59
60 static int
mac802154_wpan_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)61 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
62 {
63 struct mac802154_sub_if_data *priv = netdev_priv(dev);
64 struct sockaddr_ieee802154 *sa =
65 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
66 int err = -ENOIOCTLCMD;
67
68 spin_lock_bh(&priv->mib_lock);
69
70 switch (cmd) {
71 case SIOCGIFADDR:
72 {
73 u16 pan_id, short_addr;
74
75 pan_id = le16_to_cpu(priv->pan_id);
76 short_addr = le16_to_cpu(priv->short_addr);
77 if (pan_id == IEEE802154_PANID_BROADCAST ||
78 short_addr == IEEE802154_ADDR_BROADCAST) {
79 err = -EADDRNOTAVAIL;
80 break;
81 }
82
83 sa->family = AF_IEEE802154;
84 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
85 sa->addr.pan_id = pan_id;
86 sa->addr.short_addr = short_addr;
87
88 err = 0;
89 break;
90 }
91 case SIOCSIFADDR:
92 dev_warn(&dev->dev,
93 "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
94 if (sa->family != AF_IEEE802154 ||
95 sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
96 sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
97 sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
98 sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
99 err = -EINVAL;
100 break;
101 }
102
103 priv->pan_id = cpu_to_le16(sa->addr.pan_id);
104 priv->short_addr = cpu_to_le16(sa->addr.short_addr);
105
106 err = mac802154_wpan_update_llsec(dev);
107 break;
108 }
109
110 spin_unlock_bh(&priv->mib_lock);
111 return err;
112 }
113
mac802154_wpan_mac_addr(struct net_device * dev,void * p)114 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
115 {
116 struct sockaddr *addr = p;
117
118 if (netif_running(dev))
119 return -EBUSY;
120
121 /* FIXME: validate addr */
122 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
123 mac802154_dev_set_ieee_addr(dev);
124 return mac802154_wpan_update_llsec(dev);
125 }
126
mac802154_set_mac_params(struct net_device * dev,const struct ieee802154_mac_params * params)127 int mac802154_set_mac_params(struct net_device *dev,
128 const struct ieee802154_mac_params *params)
129 {
130 struct mac802154_sub_if_data *priv = netdev_priv(dev);
131
132 mutex_lock(&priv->hw->slaves_mtx);
133 priv->mac_params = *params;
134 mutex_unlock(&priv->hw->slaves_mtx);
135
136 return 0;
137 }
138
mac802154_get_mac_params(struct net_device * dev,struct ieee802154_mac_params * params)139 void mac802154_get_mac_params(struct net_device *dev,
140 struct ieee802154_mac_params *params)
141 {
142 struct mac802154_sub_if_data *priv = netdev_priv(dev);
143
144 mutex_lock(&priv->hw->slaves_mtx);
145 *params = priv->mac_params;
146 mutex_unlock(&priv->hw->slaves_mtx);
147 }
148
mac802154_wpan_open(struct net_device * dev)149 static int mac802154_wpan_open(struct net_device *dev)
150 {
151 int rc;
152 struct mac802154_sub_if_data *priv = netdev_priv(dev);
153 struct wpan_phy *phy = priv->hw->phy;
154
155 rc = mac802154_slave_open(dev);
156 if (rc < 0)
157 return rc;
158
159 mutex_lock(&phy->pib_lock);
160
161 if (phy->set_txpower) {
162 rc = phy->set_txpower(phy, priv->mac_params.transmit_power);
163 if (rc < 0)
164 goto out;
165 }
166
167 if (phy->set_lbt) {
168 rc = phy->set_lbt(phy, priv->mac_params.lbt);
169 if (rc < 0)
170 goto out;
171 }
172
173 if (phy->set_cca_mode) {
174 rc = phy->set_cca_mode(phy, priv->mac_params.cca_mode);
175 if (rc < 0)
176 goto out;
177 }
178
179 if (phy->set_cca_ed_level) {
180 rc = phy->set_cca_ed_level(phy, priv->mac_params.cca_ed_level);
181 if (rc < 0)
182 goto out;
183 }
184
185 if (phy->set_csma_params) {
186 rc = phy->set_csma_params(phy, priv->mac_params.min_be,
187 priv->mac_params.max_be,
188 priv->mac_params.csma_retries);
189 if (rc < 0)
190 goto out;
191 }
192
193 if (phy->set_frame_retries) {
194 rc = phy->set_frame_retries(phy,
195 priv->mac_params.frame_retries);
196 if (rc < 0)
197 goto out;
198 }
199
200 mutex_unlock(&phy->pib_lock);
201 return 0;
202
203 out:
204 mutex_unlock(&phy->pib_lock);
205 return rc;
206 }
207
mac802154_set_header_security(struct mac802154_sub_if_data * priv,struct ieee802154_hdr * hdr,const struct ieee802154_mac_cb * cb)208 static int mac802154_set_header_security(struct mac802154_sub_if_data *priv,
209 struct ieee802154_hdr *hdr,
210 const struct ieee802154_mac_cb *cb)
211 {
212 struct ieee802154_llsec_params params;
213 u8 level;
214
215 mac802154_llsec_get_params(&priv->sec, ¶ms);
216
217 if (!params.enabled && cb->secen_override && cb->secen)
218 return -EINVAL;
219 if (!params.enabled ||
220 (cb->secen_override && !cb->secen) ||
221 !params.out_level)
222 return 0;
223 if (cb->seclevel_override && !cb->seclevel)
224 return -EINVAL;
225
226 level = cb->seclevel_override ? cb->seclevel : params.out_level;
227
228 hdr->fc.security_enabled = 1;
229 hdr->sec.level = level;
230 hdr->sec.key_id_mode = params.out_key.mode;
231 if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
232 hdr->sec.short_src = params.out_key.short_source;
233 else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
234 hdr->sec.extended_src = params.out_key.extended_source;
235 hdr->sec.key_id = params.out_key.id;
236
237 return 0;
238 }
239
mac802154_header_create(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned len)240 static int mac802154_header_create(struct sk_buff *skb,
241 struct net_device *dev,
242 unsigned short type,
243 const void *daddr,
244 const void *saddr,
245 unsigned len)
246 {
247 struct ieee802154_hdr hdr;
248 struct mac802154_sub_if_data *priv = netdev_priv(dev);
249 struct ieee802154_mac_cb *cb = mac_cb(skb);
250 int hlen;
251
252 if (!daddr)
253 return -EINVAL;
254
255 memset(&hdr.fc, 0, sizeof(hdr.fc));
256 hdr.fc.type = cb->type;
257 hdr.fc.security_enabled = cb->secen;
258 hdr.fc.ack_request = cb->ackreq;
259 hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
260
261 if (mac802154_set_header_security(priv, &hdr, cb) < 0)
262 return -EINVAL;
263
264 if (!saddr) {
265 spin_lock_bh(&priv->mib_lock);
266
267 if (priv->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
268 priv->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
269 priv->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
270 hdr.source.mode = IEEE802154_ADDR_LONG;
271 hdr.source.extended_addr = priv->extended_addr;
272 } else {
273 hdr.source.mode = IEEE802154_ADDR_SHORT;
274 hdr.source.short_addr = priv->short_addr;
275 }
276
277 hdr.source.pan_id = priv->pan_id;
278
279 spin_unlock_bh(&priv->mib_lock);
280 } else {
281 hdr.source = *(const struct ieee802154_addr *)saddr;
282 }
283
284 hdr.dest = *(const struct ieee802154_addr *)daddr;
285
286 hlen = ieee802154_hdr_push(skb, &hdr);
287 if (hlen < 0)
288 return -EINVAL;
289
290 skb_reset_mac_header(skb);
291 skb->mac_len = hlen;
292
293 if (len > ieee802154_max_payload(&hdr))
294 return -EMSGSIZE;
295
296 return hlen;
297 }
298
299 static int
mac802154_header_parse(const struct sk_buff * skb,unsigned char * haddr)300 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
301 {
302 struct ieee802154_hdr hdr;
303 struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
304
305 if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
306 pr_debug("malformed packet\n");
307 return 0;
308 }
309
310 *addr = hdr.source;
311 return sizeof(*addr);
312 }
313
314 static netdev_tx_t
mac802154_wpan_xmit(struct sk_buff * skb,struct net_device * dev)315 mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
316 {
317 struct mac802154_sub_if_data *priv;
318 u8 chan, page;
319 int rc;
320
321 priv = netdev_priv(dev);
322
323 spin_lock_bh(&priv->mib_lock);
324 chan = priv->chan;
325 page = priv->page;
326 spin_unlock_bh(&priv->mib_lock);
327
328 if (chan == MAC802154_CHAN_NONE ||
329 page >= WPAN_NUM_PAGES ||
330 chan >= WPAN_NUM_CHANNELS) {
331 kfree_skb(skb);
332 return NETDEV_TX_OK;
333 }
334
335 rc = mac802154_llsec_encrypt(&priv->sec, skb);
336 if (rc) {
337 pr_warn("encryption failed: %i\n", rc);
338 kfree_skb(skb);
339 return NETDEV_TX_OK;
340 }
341
342 skb->skb_iif = dev->ifindex;
343 dev->stats.tx_packets++;
344 dev->stats.tx_bytes += skb->len;
345
346 return mac802154_tx(priv->hw, skb, page, chan);
347 }
348
349 static struct header_ops mac802154_header_ops = {
350 .create = mac802154_header_create,
351 .parse = mac802154_header_parse,
352 };
353
354 static const struct net_device_ops mac802154_wpan_ops = {
355 .ndo_open = mac802154_wpan_open,
356 .ndo_stop = mac802154_slave_close,
357 .ndo_start_xmit = mac802154_wpan_xmit,
358 .ndo_do_ioctl = mac802154_wpan_ioctl,
359 .ndo_set_mac_address = mac802154_wpan_mac_addr,
360 };
361
mac802154_wpan_free(struct net_device * dev)362 static void mac802154_wpan_free(struct net_device *dev)
363 {
364 struct mac802154_sub_if_data *priv = netdev_priv(dev);
365
366 mac802154_llsec_destroy(&priv->sec);
367
368 free_netdev(dev);
369 }
370
mac802154_wpan_setup(struct net_device * dev)371 void mac802154_wpan_setup(struct net_device *dev)
372 {
373 struct mac802154_sub_if_data *priv;
374
375 dev->addr_len = IEEE802154_ADDR_LEN;
376 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
377
378 dev->hard_header_len = MAC802154_FRAME_HARD_HEADER_LEN;
379 dev->header_ops = &mac802154_header_ops;
380 dev->needed_tailroom = 2 + 16; /* FCS + MIC */
381 dev->mtu = IEEE802154_MTU;
382 dev->tx_queue_len = 300;
383 dev->type = ARPHRD_IEEE802154;
384 dev->flags = IFF_NOARP | IFF_BROADCAST;
385 dev->watchdog_timeo = 0;
386
387 dev->destructor = mac802154_wpan_free;
388 dev->netdev_ops = &mac802154_wpan_ops;
389 dev->ml_priv = &mac802154_mlme_wpan;
390
391 priv = netdev_priv(dev);
392 priv->type = IEEE802154_DEV_WPAN;
393
394 priv->chan = MAC802154_CHAN_NONE;
395 priv->page = 0;
396
397 spin_lock_init(&priv->mib_lock);
398 mutex_init(&priv->sec_mtx);
399
400 get_random_bytes(&priv->bsn, 1);
401 get_random_bytes(&priv->dsn, 1);
402
403 /* defaults per 802.15.4-2011 */
404 priv->mac_params.min_be = 3;
405 priv->mac_params.max_be = 5;
406 priv->mac_params.csma_retries = 4;
407 priv->mac_params.frame_retries = -1; /* for compatibility, actual default is 3 */
408
409 priv->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
410 priv->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
411
412 mac802154_llsec_init(&priv->sec);
413 }
414
mac802154_process_data(struct net_device * dev,struct sk_buff * skb)415 static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
416 {
417 return netif_rx_ni(skb);
418 }
419
420 static int
mac802154_subif_frame(struct mac802154_sub_if_data * sdata,struct sk_buff * skb,const struct ieee802154_hdr * hdr)421 mac802154_subif_frame(struct mac802154_sub_if_data *sdata, struct sk_buff *skb,
422 const struct ieee802154_hdr *hdr)
423 {
424 __le16 span, sshort;
425 int rc;
426
427 pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
428
429 spin_lock_bh(&sdata->mib_lock);
430
431 span = sdata->pan_id;
432 sshort = sdata->short_addr;
433
434 switch (mac_cb(skb)->dest.mode) {
435 case IEEE802154_ADDR_NONE:
436 if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
437 /* FIXME: check if we are PAN coordinator */
438 skb->pkt_type = PACKET_OTHERHOST;
439 else
440 /* ACK comes with both addresses empty */
441 skb->pkt_type = PACKET_HOST;
442 break;
443 case IEEE802154_ADDR_LONG:
444 if (mac_cb(skb)->dest.pan_id != span &&
445 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
446 skb->pkt_type = PACKET_OTHERHOST;
447 else if (mac_cb(skb)->dest.extended_addr == sdata->extended_addr)
448 skb->pkt_type = PACKET_HOST;
449 else
450 skb->pkt_type = PACKET_OTHERHOST;
451 break;
452 case IEEE802154_ADDR_SHORT:
453 if (mac_cb(skb)->dest.pan_id != span &&
454 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
455 skb->pkt_type = PACKET_OTHERHOST;
456 else if (mac_cb(skb)->dest.short_addr == sshort)
457 skb->pkt_type = PACKET_HOST;
458 else if (mac_cb(skb)->dest.short_addr ==
459 cpu_to_le16(IEEE802154_ADDR_BROADCAST))
460 skb->pkt_type = PACKET_BROADCAST;
461 else
462 skb->pkt_type = PACKET_OTHERHOST;
463 break;
464 default:
465 spin_unlock_bh(&sdata->mib_lock);
466 pr_debug("invalid dest mode\n");
467 kfree_skb(skb);
468 return NET_RX_DROP;
469 }
470
471 spin_unlock_bh(&sdata->mib_lock);
472
473 skb->dev = sdata->dev;
474
475 rc = mac802154_llsec_decrypt(&sdata->sec, skb);
476 if (rc) {
477 pr_debug("decryption failed: %i\n", rc);
478 goto fail;
479 }
480
481 sdata->dev->stats.rx_packets++;
482 sdata->dev->stats.rx_bytes += skb->len;
483
484 switch (mac_cb(skb)->type) {
485 case IEEE802154_FC_TYPE_DATA:
486 return mac802154_process_data(sdata->dev, skb);
487 default:
488 pr_warn("ieee802154: bad frame received (type = %d)\n",
489 mac_cb(skb)->type);
490 goto fail;
491 }
492
493 fail:
494 kfree_skb(skb);
495 return NET_RX_DROP;
496 }
497
mac802154_print_addr(const char * name,const struct ieee802154_addr * addr)498 static void mac802154_print_addr(const char *name,
499 const struct ieee802154_addr *addr)
500 {
501 if (addr->mode == IEEE802154_ADDR_NONE)
502 pr_debug("%s not present\n", name);
503
504 pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
505 if (addr->mode == IEEE802154_ADDR_SHORT) {
506 pr_debug("%s is short: %04x\n", name,
507 le16_to_cpu(addr->short_addr));
508 } else {
509 u64 hw = swab64((__force u64) addr->extended_addr);
510
511 pr_debug("%s is hardware: %8phC\n", name, &hw);
512 }
513 }
514
mac802154_parse_frame_start(struct sk_buff * skb,struct ieee802154_hdr * hdr)515 static int mac802154_parse_frame_start(struct sk_buff *skb,
516 struct ieee802154_hdr *hdr)
517 {
518 int hlen;
519 struct ieee802154_mac_cb *cb = mac_cb_init(skb);
520
521 hlen = ieee802154_hdr_pull(skb, hdr);
522 if (hlen < 0)
523 return -EINVAL;
524
525 skb->mac_len = hlen;
526
527 pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
528 hdr->seq);
529
530 cb->type = hdr->fc.type;
531 cb->ackreq = hdr->fc.ack_request;
532 cb->secen = hdr->fc.security_enabled;
533
534 mac802154_print_addr("destination", &hdr->dest);
535 mac802154_print_addr("source", &hdr->source);
536
537 cb->source = hdr->source;
538 cb->dest = hdr->dest;
539
540 if (hdr->fc.security_enabled) {
541 u64 key;
542
543 pr_debug("seclevel %i\n", hdr->sec.level);
544
545 switch (hdr->sec.key_id_mode) {
546 case IEEE802154_SCF_KEY_IMPLICIT:
547 pr_debug("implicit key\n");
548 break;
549
550 case IEEE802154_SCF_KEY_INDEX:
551 pr_debug("key %02x\n", hdr->sec.key_id);
552 break;
553
554 case IEEE802154_SCF_KEY_SHORT_INDEX:
555 pr_debug("key %04x:%04x %02x\n",
556 le32_to_cpu(hdr->sec.short_src) >> 16,
557 le32_to_cpu(hdr->sec.short_src) & 0xffff,
558 hdr->sec.key_id);
559 break;
560
561 case IEEE802154_SCF_KEY_HW_INDEX:
562 key = swab64((__force u64) hdr->sec.extended_src);
563 pr_debug("key source %8phC %02x\n", &key,
564 hdr->sec.key_id);
565 break;
566 }
567 }
568
569 return 0;
570 }
571
mac802154_wpans_rx(struct mac802154_priv * priv,struct sk_buff * skb)572 void mac802154_wpans_rx(struct mac802154_priv *priv, struct sk_buff *skb)
573 {
574 int ret;
575 struct mac802154_sub_if_data *sdata;
576 struct ieee802154_hdr hdr;
577
578 ret = mac802154_parse_frame_start(skb, &hdr);
579 if (ret) {
580 pr_debug("got invalid frame\n");
581 kfree_skb(skb);
582 return;
583 }
584
585 rcu_read_lock();
586 list_for_each_entry_rcu(sdata, &priv->slaves, list) {
587 if (sdata->type != IEEE802154_DEV_WPAN ||
588 !netif_running(sdata->dev))
589 continue;
590
591 mac802154_subif_frame(sdata, skb, &hdr);
592 skb = NULL;
593 break;
594 }
595 rcu_read_unlock();
596
597 if (skb)
598 kfree_skb(skb);
599 }
600