1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * HWSIM IEEE 802.15.4 interface |
4 | * |
5 | * (C) 2018 Mojatau, Alexander Aring <aring@mojatau.com> |
6 | * Copyright 2007-2012 Siemens AG |
7 | * |
8 | * Based on fakelb, original Written by: |
9 | * Sergey Lapin <slapin@ossfans.org> |
10 | * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> |
11 | * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> |
12 | */ |
13 | |
14 | #include <linux/module.h> |
15 | #include <linux/timer.h> |
16 | #include <linux/platform_device.h> |
17 | #include <linux/rtnetlink.h> |
18 | #include <linux/netdevice.h> |
19 | #include <linux/device.h> |
20 | #include <linux/spinlock.h> |
21 | #include <net/ieee802154_netdev.h> |
22 | #include <net/mac802154.h> |
23 | #include <net/cfg802154.h> |
24 | #include <net/genetlink.h> |
25 | #include "mac802154_hwsim.h" |
26 | |
27 | MODULE_DESCRIPTION("Software simulator of IEEE 802.15.4 radio(s) for mac802154" ); |
28 | MODULE_LICENSE("GPL" ); |
29 | |
30 | static LIST_HEAD(hwsim_phys); |
31 | static DEFINE_MUTEX(hwsim_phys_lock); |
32 | |
33 | static struct platform_device *mac802154hwsim_dev; |
34 | |
35 | /* MAC802154_HWSIM netlink family */ |
36 | static struct genl_family hwsim_genl_family; |
37 | |
38 | static int hwsim_radio_idx; |
39 | |
40 | enum hwsim_multicast_groups { |
41 | HWSIM_MCGRP_CONFIG, |
42 | }; |
43 | |
44 | static const struct genl_multicast_group hwsim_mcgrps[] = { |
45 | [HWSIM_MCGRP_CONFIG] = { .name = "config" , }, |
46 | }; |
47 | |
48 | struct hwsim_pib { |
49 | u8 page; |
50 | u8 channel; |
51 | struct ieee802154_hw_addr_filt filt; |
52 | enum ieee802154_filtering_level filt_level; |
53 | |
54 | struct rcu_head rcu; |
55 | }; |
56 | |
57 | struct hwsim_edge_info { |
58 | u8 lqi; |
59 | |
60 | struct rcu_head rcu; |
61 | }; |
62 | |
63 | struct hwsim_edge { |
64 | struct hwsim_phy *endpoint; |
65 | struct hwsim_edge_info __rcu *info; |
66 | |
67 | struct list_head list; |
68 | struct rcu_head rcu; |
69 | }; |
70 | |
71 | struct hwsim_phy { |
72 | struct ieee802154_hw *hw; |
73 | u32 idx; |
74 | |
75 | struct hwsim_pib __rcu *pib; |
76 | |
77 | bool suspended; |
78 | struct list_head edges; |
79 | |
80 | struct list_head list; |
81 | }; |
82 | |
83 | static int hwsim_add_one(struct genl_info *info, struct device *dev, |
84 | bool init); |
85 | static void hwsim_del(struct hwsim_phy *phy); |
86 | |
87 | static int hwsim_hw_ed(struct ieee802154_hw *hw, u8 *level) |
88 | { |
89 | *level = 0xbe; |
90 | |
91 | return 0; |
92 | } |
93 | |
94 | static int hwsim_update_pib(struct ieee802154_hw *hw, u8 page, u8 channel, |
95 | struct ieee802154_hw_addr_filt *filt, |
96 | enum ieee802154_filtering_level filt_level) |
97 | { |
98 | struct hwsim_phy *phy = hw->priv; |
99 | struct hwsim_pib *pib, *pib_old; |
100 | |
101 | pib = kzalloc(size: sizeof(*pib), GFP_ATOMIC); |
102 | if (!pib) |
103 | return -ENOMEM; |
104 | |
105 | pib_old = rtnl_dereference(phy->pib); |
106 | |
107 | pib->page = page; |
108 | pib->channel = channel; |
109 | pib->filt.short_addr = filt->short_addr; |
110 | pib->filt.pan_id = filt->pan_id; |
111 | pib->filt.ieee_addr = filt->ieee_addr; |
112 | pib->filt.pan_coord = filt->pan_coord; |
113 | pib->filt_level = filt_level; |
114 | |
115 | rcu_assign_pointer(phy->pib, pib); |
116 | kfree_rcu(pib_old, rcu); |
117 | return 0; |
118 | } |
119 | |
120 | static int hwsim_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel) |
121 | { |
122 | struct hwsim_phy *phy = hw->priv; |
123 | struct hwsim_pib *pib; |
124 | int ret; |
125 | |
126 | rcu_read_lock(); |
127 | pib = rcu_dereference(phy->pib); |
128 | ret = hwsim_update_pib(hw, page, channel, filt: &pib->filt, filt_level: pib->filt_level); |
129 | rcu_read_unlock(); |
130 | |
131 | return ret; |
132 | } |
133 | |
134 | static int hwsim_hw_addr_filt(struct ieee802154_hw *hw, |
135 | struct ieee802154_hw_addr_filt *filt, |
136 | unsigned long changed) |
137 | { |
138 | struct hwsim_phy *phy = hw->priv; |
139 | struct hwsim_pib *pib; |
140 | int ret; |
141 | |
142 | rcu_read_lock(); |
143 | pib = rcu_dereference(phy->pib); |
144 | ret = hwsim_update_pib(hw, page: pib->page, channel: pib->channel, filt, filt_level: pib->filt_level); |
145 | rcu_read_unlock(); |
146 | |
147 | return ret; |
148 | } |
149 | |
150 | static void hwsim_hw_receive(struct ieee802154_hw *hw, struct sk_buff *skb, |
151 | u8 lqi) |
152 | { |
153 | struct ieee802154_hdr hdr; |
154 | struct hwsim_phy *phy = hw->priv; |
155 | struct hwsim_pib *pib; |
156 | |
157 | rcu_read_lock(); |
158 | pib = rcu_dereference(phy->pib); |
159 | |
160 | if (!pskb_may_pull(skb, len: 3)) { |
161 | dev_dbg(hw->parent, "invalid frame\n" ); |
162 | goto drop; |
163 | } |
164 | |
165 | memcpy(&hdr, skb->data, 3); |
166 | |
167 | /* Level 4 filtering: Frame fields validity */ |
168 | if (pib->filt_level == IEEE802154_FILTERING_4_FRAME_FIELDS) { |
169 | /* a) Drop reserved frame types */ |
170 | switch (mac_cb(skb)->type) { |
171 | case IEEE802154_FC_TYPE_BEACON: |
172 | case IEEE802154_FC_TYPE_DATA: |
173 | case IEEE802154_FC_TYPE_ACK: |
174 | case IEEE802154_FC_TYPE_MAC_CMD: |
175 | break; |
176 | default: |
177 | dev_dbg(hw->parent, "unrecognized frame type 0x%x\n" , |
178 | mac_cb(skb)->type); |
179 | goto drop; |
180 | } |
181 | |
182 | /* b) Drop reserved frame versions */ |
183 | switch (hdr.fc.version) { |
184 | case IEEE802154_2003_STD: |
185 | case IEEE802154_2006_STD: |
186 | case IEEE802154_STD: |
187 | break; |
188 | default: |
189 | dev_dbg(hw->parent, |
190 | "unrecognized frame version 0x%x\n" , |
191 | hdr.fc.version); |
192 | goto drop; |
193 | } |
194 | |
195 | /* c) PAN ID constraints */ |
196 | if ((mac_cb(skb)->dest.mode == IEEE802154_ADDR_LONG || |
197 | mac_cb(skb)->dest.mode == IEEE802154_ADDR_SHORT) && |
198 | mac_cb(skb)->dest.pan_id != pib->filt.pan_id && |
199 | mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST)) { |
200 | dev_dbg(hw->parent, |
201 | "unrecognized PAN ID %04x\n" , |
202 | le16_to_cpu(mac_cb(skb)->dest.pan_id)); |
203 | goto drop; |
204 | } |
205 | |
206 | /* d1) Short address constraints */ |
207 | if (mac_cb(skb)->dest.mode == IEEE802154_ADDR_SHORT && |
208 | mac_cb(skb)->dest.short_addr != pib->filt.short_addr && |
209 | mac_cb(skb)->dest.short_addr != cpu_to_le16(IEEE802154_ADDR_BROADCAST)) { |
210 | dev_dbg(hw->parent, |
211 | "unrecognized short address %04x\n" , |
212 | le16_to_cpu(mac_cb(skb)->dest.short_addr)); |
213 | goto drop; |
214 | } |
215 | |
216 | /* d2) Extended address constraints */ |
217 | if (mac_cb(skb)->dest.mode == IEEE802154_ADDR_LONG && |
218 | mac_cb(skb)->dest.extended_addr != pib->filt.ieee_addr) { |
219 | dev_dbg(hw->parent, |
220 | "unrecognized long address 0x%016llx\n" , |
221 | mac_cb(skb)->dest.extended_addr); |
222 | goto drop; |
223 | } |
224 | |
225 | /* d4) Specific PAN coordinator case (no parent) */ |
226 | if ((mac_cb(skb)->type == IEEE802154_FC_TYPE_DATA || |
227 | mac_cb(skb)->type == IEEE802154_FC_TYPE_MAC_CMD) && |
228 | mac_cb(skb)->dest.mode == IEEE802154_ADDR_NONE) { |
229 | dev_dbg(hw->parent, |
230 | "relaying is not supported\n" ); |
231 | goto drop; |
232 | } |
233 | |
234 | /* e) Beacon frames follow specific PAN ID rules */ |
235 | if (mac_cb(skb)->type == IEEE802154_FC_TYPE_BEACON && |
236 | pib->filt.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST) && |
237 | mac_cb(skb)->dest.pan_id != pib->filt.pan_id) { |
238 | dev_dbg(hw->parent, |
239 | "invalid beacon PAN ID %04x\n" , |
240 | le16_to_cpu(mac_cb(skb)->dest.pan_id)); |
241 | goto drop; |
242 | } |
243 | } |
244 | |
245 | rcu_read_unlock(); |
246 | |
247 | ieee802154_rx_irqsafe(hw, skb, lqi); |
248 | |
249 | return; |
250 | |
251 | drop: |
252 | rcu_read_unlock(); |
253 | kfree_skb(skb); |
254 | } |
255 | |
256 | static int hwsim_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb) |
257 | { |
258 | struct hwsim_phy *current_phy = hw->priv; |
259 | struct hwsim_pib *current_pib, *endpoint_pib; |
260 | struct hwsim_edge_info *einfo; |
261 | struct hwsim_edge *e; |
262 | |
263 | WARN_ON(current_phy->suspended); |
264 | |
265 | rcu_read_lock(); |
266 | current_pib = rcu_dereference(current_phy->pib); |
267 | list_for_each_entry_rcu(e, ¤t_phy->edges, list) { |
268 | /* Can be changed later in rx_irqsafe, but this is only a |
269 | * performance tweak. Received radio should drop the frame |
270 | * in mac802154 stack anyway... so we don't need to be |
271 | * 100% of locking here to check on suspended |
272 | */ |
273 | if (e->endpoint->suspended) |
274 | continue; |
275 | |
276 | endpoint_pib = rcu_dereference(e->endpoint->pib); |
277 | if (current_pib->page == endpoint_pib->page && |
278 | current_pib->channel == endpoint_pib->channel) { |
279 | struct sk_buff *newskb = pskb_copy(skb, GFP_ATOMIC); |
280 | |
281 | einfo = rcu_dereference(e->info); |
282 | if (newskb) |
283 | hwsim_hw_receive(hw: e->endpoint->hw, skb: newskb, lqi: einfo->lqi); |
284 | } |
285 | } |
286 | rcu_read_unlock(); |
287 | |
288 | ieee802154_xmit_complete(hw, skb, ifs_handling: false); |
289 | return 0; |
290 | } |
291 | |
292 | static int hwsim_hw_start(struct ieee802154_hw *hw) |
293 | { |
294 | struct hwsim_phy *phy = hw->priv; |
295 | |
296 | phy->suspended = false; |
297 | |
298 | return 0; |
299 | } |
300 | |
301 | static void hwsim_hw_stop(struct ieee802154_hw *hw) |
302 | { |
303 | struct hwsim_phy *phy = hw->priv; |
304 | |
305 | phy->suspended = true; |
306 | } |
307 | |
308 | static int |
309 | hwsim_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on) |
310 | { |
311 | enum ieee802154_filtering_level filt_level; |
312 | struct hwsim_phy *phy = hw->priv; |
313 | struct hwsim_pib *pib; |
314 | int ret; |
315 | |
316 | if (on) |
317 | filt_level = IEEE802154_FILTERING_NONE; |
318 | else |
319 | filt_level = IEEE802154_FILTERING_4_FRAME_FIELDS; |
320 | |
321 | rcu_read_lock(); |
322 | pib = rcu_dereference(phy->pib); |
323 | ret = hwsim_update_pib(hw, page: pib->page, channel: pib->channel, filt: &pib->filt, filt_level); |
324 | rcu_read_unlock(); |
325 | |
326 | return ret; |
327 | } |
328 | |
329 | static const struct ieee802154_ops hwsim_ops = { |
330 | .owner = THIS_MODULE, |
331 | .xmit_async = hwsim_hw_xmit, |
332 | .ed = hwsim_hw_ed, |
333 | .set_channel = hwsim_hw_channel, |
334 | .start = hwsim_hw_start, |
335 | .stop = hwsim_hw_stop, |
336 | .set_promiscuous_mode = hwsim_set_promiscuous_mode, |
337 | .set_hw_addr_filt = hwsim_hw_addr_filt, |
338 | }; |
339 | |
340 | static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info) |
341 | { |
342 | return hwsim_add_one(info, dev: &mac802154hwsim_dev->dev, init: false); |
343 | } |
344 | |
345 | static int hwsim_del_radio_nl(struct sk_buff *msg, struct genl_info *info) |
346 | { |
347 | struct hwsim_phy *phy, *tmp; |
348 | s64 idx = -1; |
349 | |
350 | if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]) |
351 | return -EINVAL; |
352 | |
353 | idx = nla_get_u32(nla: info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]); |
354 | |
355 | mutex_lock(&hwsim_phys_lock); |
356 | list_for_each_entry_safe(phy, tmp, &hwsim_phys, list) { |
357 | if (idx == phy->idx) { |
358 | hwsim_del(phy); |
359 | mutex_unlock(lock: &hwsim_phys_lock); |
360 | return 0; |
361 | } |
362 | } |
363 | mutex_unlock(lock: &hwsim_phys_lock); |
364 | |
365 | return -ENODEV; |
366 | } |
367 | |
368 | static int append_radio_msg(struct sk_buff *skb, struct hwsim_phy *phy) |
369 | { |
370 | struct nlattr *nl_edges, *nl_edge; |
371 | struct hwsim_edge_info *einfo; |
372 | struct hwsim_edge *e; |
373 | int ret; |
374 | |
375 | ret = nla_put_u32(skb, attrtype: MAC802154_HWSIM_ATTR_RADIO_ID, value: phy->idx); |
376 | if (ret < 0) |
377 | return ret; |
378 | |
379 | rcu_read_lock(); |
380 | if (list_empty(head: &phy->edges)) { |
381 | rcu_read_unlock(); |
382 | return 0; |
383 | } |
384 | |
385 | nl_edges = nla_nest_start_noflag(skb, |
386 | attrtype: MAC802154_HWSIM_ATTR_RADIO_EDGES); |
387 | if (!nl_edges) { |
388 | rcu_read_unlock(); |
389 | return -ENOBUFS; |
390 | } |
391 | |
392 | list_for_each_entry_rcu(e, &phy->edges, list) { |
393 | nl_edge = nla_nest_start_noflag(skb, |
394 | attrtype: MAC802154_HWSIM_ATTR_RADIO_EDGE); |
395 | if (!nl_edge) { |
396 | rcu_read_unlock(); |
397 | nla_nest_cancel(skb, start: nl_edges); |
398 | return -ENOBUFS; |
399 | } |
400 | |
401 | ret = nla_put_u32(skb, attrtype: MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID, |
402 | value: e->endpoint->idx); |
403 | if (ret < 0) { |
404 | rcu_read_unlock(); |
405 | nla_nest_cancel(skb, start: nl_edge); |
406 | nla_nest_cancel(skb, start: nl_edges); |
407 | return ret; |
408 | } |
409 | |
410 | einfo = rcu_dereference(e->info); |
411 | ret = nla_put_u8(skb, attrtype: MAC802154_HWSIM_EDGE_ATTR_LQI, |
412 | value: einfo->lqi); |
413 | if (ret < 0) { |
414 | rcu_read_unlock(); |
415 | nla_nest_cancel(skb, start: nl_edge); |
416 | nla_nest_cancel(skb, start: nl_edges); |
417 | return ret; |
418 | } |
419 | |
420 | nla_nest_end(skb, start: nl_edge); |
421 | } |
422 | rcu_read_unlock(); |
423 | |
424 | nla_nest_end(skb, start: nl_edges); |
425 | |
426 | return 0; |
427 | } |
428 | |
429 | static int hwsim_get_radio(struct sk_buff *skb, struct hwsim_phy *phy, |
430 | u32 portid, u32 seq, |
431 | struct netlink_callback *cb, int flags) |
432 | { |
433 | void *hdr; |
434 | int res; |
435 | |
436 | hdr = genlmsg_put(skb, portid, seq, family: &hwsim_genl_family, flags, |
437 | cmd: MAC802154_HWSIM_CMD_GET_RADIO); |
438 | if (!hdr) |
439 | return -EMSGSIZE; |
440 | |
441 | if (cb) |
442 | genl_dump_check_consistent(cb, user_hdr: hdr); |
443 | |
444 | res = append_radio_msg(skb, phy); |
445 | if (res < 0) |
446 | goto out_err; |
447 | |
448 | genlmsg_end(skb, hdr); |
449 | return 0; |
450 | |
451 | out_err: |
452 | genlmsg_cancel(skb, hdr); |
453 | return res; |
454 | } |
455 | |
456 | static int hwsim_get_radio_nl(struct sk_buff *msg, struct genl_info *info) |
457 | { |
458 | struct hwsim_phy *phy; |
459 | struct sk_buff *skb; |
460 | int idx, res = -ENODEV; |
461 | |
462 | if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]) |
463 | return -EINVAL; |
464 | idx = nla_get_u32(nla: info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]); |
465 | |
466 | mutex_lock(&hwsim_phys_lock); |
467 | list_for_each_entry(phy, &hwsim_phys, list) { |
468 | if (phy->idx != idx) |
469 | continue; |
470 | |
471 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
472 | if (!skb) { |
473 | res = -ENOMEM; |
474 | goto out_err; |
475 | } |
476 | |
477 | res = hwsim_get_radio(skb, phy, portid: info->snd_portid, |
478 | seq: info->snd_seq, NULL, flags: 0); |
479 | if (res < 0) { |
480 | nlmsg_free(skb); |
481 | goto out_err; |
482 | } |
483 | |
484 | res = genlmsg_reply(skb, info); |
485 | break; |
486 | } |
487 | |
488 | out_err: |
489 | mutex_unlock(lock: &hwsim_phys_lock); |
490 | |
491 | return res; |
492 | } |
493 | |
494 | static int hwsim_dump_radio_nl(struct sk_buff *skb, |
495 | struct netlink_callback *cb) |
496 | { |
497 | int idx = cb->args[0]; |
498 | struct hwsim_phy *phy; |
499 | int res; |
500 | |
501 | mutex_lock(&hwsim_phys_lock); |
502 | |
503 | if (idx == hwsim_radio_idx) |
504 | goto done; |
505 | |
506 | list_for_each_entry(phy, &hwsim_phys, list) { |
507 | if (phy->idx < idx) |
508 | continue; |
509 | |
510 | res = hwsim_get_radio(skb, phy, NETLINK_CB(cb->skb).portid, |
511 | seq: cb->nlh->nlmsg_seq, cb, NLM_F_MULTI); |
512 | if (res < 0) |
513 | break; |
514 | |
515 | idx = phy->idx + 1; |
516 | } |
517 | |
518 | cb->args[0] = idx; |
519 | |
520 | done: |
521 | mutex_unlock(lock: &hwsim_phys_lock); |
522 | return skb->len; |
523 | } |
524 | |
525 | /* caller need to held hwsim_phys_lock */ |
526 | static struct hwsim_phy *hwsim_get_radio_by_id(uint32_t idx) |
527 | { |
528 | struct hwsim_phy *phy; |
529 | |
530 | list_for_each_entry(phy, &hwsim_phys, list) { |
531 | if (phy->idx == idx) |
532 | return phy; |
533 | } |
534 | |
535 | return NULL; |
536 | } |
537 | |
538 | static const struct nla_policy hwsim_edge_policy[MAC802154_HWSIM_EDGE_ATTR_MAX + 1] = { |
539 | [MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID] = { .type = NLA_U32 }, |
540 | [MAC802154_HWSIM_EDGE_ATTR_LQI] = { .type = NLA_U8 }, |
541 | }; |
542 | |
543 | static struct hwsim_edge *hwsim_alloc_edge(struct hwsim_phy *endpoint, u8 lqi) |
544 | { |
545 | struct hwsim_edge_info *einfo; |
546 | struct hwsim_edge *e; |
547 | |
548 | e = kzalloc(size: sizeof(*e), GFP_KERNEL); |
549 | if (!e) |
550 | return NULL; |
551 | |
552 | einfo = kzalloc(size: sizeof(*einfo), GFP_KERNEL); |
553 | if (!einfo) { |
554 | kfree(objp: e); |
555 | return NULL; |
556 | } |
557 | |
558 | einfo->lqi = 0xff; |
559 | rcu_assign_pointer(e->info, einfo); |
560 | e->endpoint = endpoint; |
561 | |
562 | return e; |
563 | } |
564 | |
565 | static void hwsim_free_edge(struct hwsim_edge *e) |
566 | { |
567 | struct hwsim_edge_info *einfo; |
568 | |
569 | rcu_read_lock(); |
570 | einfo = rcu_dereference(e->info); |
571 | rcu_read_unlock(); |
572 | |
573 | kfree_rcu(einfo, rcu); |
574 | kfree_rcu(e, rcu); |
575 | } |
576 | |
577 | static int hwsim_new_edge_nl(struct sk_buff *msg, struct genl_info *info) |
578 | { |
579 | struct nlattr *edge_attrs[MAC802154_HWSIM_EDGE_ATTR_MAX + 1]; |
580 | struct hwsim_phy *phy_v0, *phy_v1; |
581 | struct hwsim_edge *e; |
582 | u32 v0, v1; |
583 | |
584 | if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID] || |
585 | !info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE]) |
586 | return -EINVAL; |
587 | |
588 | if (nla_parse_nested_deprecated(tb: edge_attrs, MAC802154_HWSIM_EDGE_ATTR_MAX, nla: info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE], policy: hwsim_edge_policy, NULL)) |
589 | return -EINVAL; |
590 | |
591 | if (!edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID]) |
592 | return -EINVAL; |
593 | |
594 | v0 = nla_get_u32(nla: info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]); |
595 | v1 = nla_get_u32(nla: edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID]); |
596 | |
597 | if (v0 == v1) |
598 | return -EINVAL; |
599 | |
600 | mutex_lock(&hwsim_phys_lock); |
601 | phy_v0 = hwsim_get_radio_by_id(idx: v0); |
602 | if (!phy_v0) { |
603 | mutex_unlock(lock: &hwsim_phys_lock); |
604 | return -ENOENT; |
605 | } |
606 | |
607 | phy_v1 = hwsim_get_radio_by_id(idx: v1); |
608 | if (!phy_v1) { |
609 | mutex_unlock(lock: &hwsim_phys_lock); |
610 | return -ENOENT; |
611 | } |
612 | |
613 | rcu_read_lock(); |
614 | list_for_each_entry_rcu(e, &phy_v0->edges, list) { |
615 | if (e->endpoint->idx == v1) { |
616 | mutex_unlock(lock: &hwsim_phys_lock); |
617 | rcu_read_unlock(); |
618 | return -EEXIST; |
619 | } |
620 | } |
621 | rcu_read_unlock(); |
622 | |
623 | e = hwsim_alloc_edge(endpoint: phy_v1, lqi: 0xff); |
624 | if (!e) { |
625 | mutex_unlock(lock: &hwsim_phys_lock); |
626 | return -ENOMEM; |
627 | } |
628 | list_add_rcu(new: &e->list, head: &phy_v0->edges); |
629 | /* wait until changes are done under hwsim_phys_lock lock |
630 | * should prevent of calling this function twice while |
631 | * edges list has not the changes yet. |
632 | */ |
633 | synchronize_rcu(); |
634 | mutex_unlock(lock: &hwsim_phys_lock); |
635 | |
636 | return 0; |
637 | } |
638 | |
639 | static int hwsim_del_edge_nl(struct sk_buff *msg, struct genl_info *info) |
640 | { |
641 | struct nlattr *edge_attrs[MAC802154_HWSIM_EDGE_ATTR_MAX + 1]; |
642 | struct hwsim_phy *phy_v0; |
643 | struct hwsim_edge *e; |
644 | u32 v0, v1; |
645 | |
646 | if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID] || |
647 | !info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE]) |
648 | return -EINVAL; |
649 | |
650 | if (nla_parse_nested_deprecated(tb: edge_attrs, MAC802154_HWSIM_EDGE_ATTR_MAX, nla: info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE], policy: hwsim_edge_policy, NULL)) |
651 | return -EINVAL; |
652 | |
653 | if (!edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID]) |
654 | return -EINVAL; |
655 | |
656 | v0 = nla_get_u32(nla: info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]); |
657 | v1 = nla_get_u32(nla: edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID]); |
658 | |
659 | mutex_lock(&hwsim_phys_lock); |
660 | phy_v0 = hwsim_get_radio_by_id(idx: v0); |
661 | if (!phy_v0) { |
662 | mutex_unlock(lock: &hwsim_phys_lock); |
663 | return -ENOENT; |
664 | } |
665 | |
666 | rcu_read_lock(); |
667 | list_for_each_entry_rcu(e, &phy_v0->edges, list) { |
668 | if (e->endpoint->idx == v1) { |
669 | rcu_read_unlock(); |
670 | list_del_rcu(entry: &e->list); |
671 | hwsim_free_edge(e); |
672 | /* same again - wait until list changes are done */ |
673 | synchronize_rcu(); |
674 | mutex_unlock(lock: &hwsim_phys_lock); |
675 | return 0; |
676 | } |
677 | } |
678 | rcu_read_unlock(); |
679 | |
680 | mutex_unlock(lock: &hwsim_phys_lock); |
681 | |
682 | return -ENOENT; |
683 | } |
684 | |
685 | static int hwsim_set_edge_lqi(struct sk_buff *msg, struct genl_info *info) |
686 | { |
687 | struct nlattr *edge_attrs[MAC802154_HWSIM_EDGE_ATTR_MAX + 1]; |
688 | struct hwsim_edge_info *einfo, *einfo_old; |
689 | struct hwsim_phy *phy_v0; |
690 | struct hwsim_edge *e; |
691 | u32 v0, v1; |
692 | u8 lqi; |
693 | |
694 | if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID] || |
695 | !info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE]) |
696 | return -EINVAL; |
697 | |
698 | if (nla_parse_nested_deprecated(tb: edge_attrs, MAC802154_HWSIM_EDGE_ATTR_MAX, nla: info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE], policy: hwsim_edge_policy, NULL)) |
699 | return -EINVAL; |
700 | |
701 | if (!edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID] || |
702 | !edge_attrs[MAC802154_HWSIM_EDGE_ATTR_LQI]) |
703 | return -EINVAL; |
704 | |
705 | v0 = nla_get_u32(nla: info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]); |
706 | v1 = nla_get_u32(nla: edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID]); |
707 | lqi = nla_get_u8(nla: edge_attrs[MAC802154_HWSIM_EDGE_ATTR_LQI]); |
708 | |
709 | mutex_lock(&hwsim_phys_lock); |
710 | phy_v0 = hwsim_get_radio_by_id(idx: v0); |
711 | if (!phy_v0) { |
712 | mutex_unlock(lock: &hwsim_phys_lock); |
713 | return -ENOENT; |
714 | } |
715 | |
716 | einfo = kzalloc(size: sizeof(*einfo), GFP_KERNEL); |
717 | if (!einfo) { |
718 | mutex_unlock(lock: &hwsim_phys_lock); |
719 | return -ENOMEM; |
720 | } |
721 | |
722 | rcu_read_lock(); |
723 | list_for_each_entry_rcu(e, &phy_v0->edges, list) { |
724 | if (e->endpoint->idx == v1) { |
725 | einfo->lqi = lqi; |
726 | einfo_old = rcu_replace_pointer(e->info, einfo, |
727 | lockdep_is_held(&hwsim_phys_lock)); |
728 | rcu_read_unlock(); |
729 | kfree_rcu(einfo_old, rcu); |
730 | mutex_unlock(lock: &hwsim_phys_lock); |
731 | return 0; |
732 | } |
733 | } |
734 | rcu_read_unlock(); |
735 | |
736 | kfree(objp: einfo); |
737 | mutex_unlock(lock: &hwsim_phys_lock); |
738 | |
739 | return -ENOENT; |
740 | } |
741 | |
742 | /* MAC802154_HWSIM netlink policy */ |
743 | |
744 | static const struct nla_policy hwsim_genl_policy[MAC802154_HWSIM_ATTR_MAX + 1] = { |
745 | [MAC802154_HWSIM_ATTR_RADIO_ID] = { .type = NLA_U32 }, |
746 | [MAC802154_HWSIM_ATTR_RADIO_EDGE] = { .type = NLA_NESTED }, |
747 | [MAC802154_HWSIM_ATTR_RADIO_EDGES] = { .type = NLA_NESTED }, |
748 | }; |
749 | |
750 | /* Generic Netlink operations array */ |
751 | static const struct genl_small_ops hwsim_nl_ops[] = { |
752 | { |
753 | .cmd = MAC802154_HWSIM_CMD_NEW_RADIO, |
754 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
755 | .doit = hwsim_new_radio_nl, |
756 | .flags = GENL_UNS_ADMIN_PERM, |
757 | }, |
758 | { |
759 | .cmd = MAC802154_HWSIM_CMD_DEL_RADIO, |
760 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
761 | .doit = hwsim_del_radio_nl, |
762 | .flags = GENL_UNS_ADMIN_PERM, |
763 | }, |
764 | { |
765 | .cmd = MAC802154_HWSIM_CMD_GET_RADIO, |
766 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
767 | .doit = hwsim_get_radio_nl, |
768 | .dumpit = hwsim_dump_radio_nl, |
769 | }, |
770 | { |
771 | .cmd = MAC802154_HWSIM_CMD_NEW_EDGE, |
772 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
773 | .doit = hwsim_new_edge_nl, |
774 | .flags = GENL_UNS_ADMIN_PERM, |
775 | }, |
776 | { |
777 | .cmd = MAC802154_HWSIM_CMD_DEL_EDGE, |
778 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
779 | .doit = hwsim_del_edge_nl, |
780 | .flags = GENL_UNS_ADMIN_PERM, |
781 | }, |
782 | { |
783 | .cmd = MAC802154_HWSIM_CMD_SET_EDGE, |
784 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
785 | .doit = hwsim_set_edge_lqi, |
786 | .flags = GENL_UNS_ADMIN_PERM, |
787 | }, |
788 | }; |
789 | |
790 | static struct genl_family hwsim_genl_family __ro_after_init = { |
791 | .name = "MAC802154_HWSIM" , |
792 | .version = 1, |
793 | .maxattr = MAC802154_HWSIM_ATTR_MAX, |
794 | .policy = hwsim_genl_policy, |
795 | .module = THIS_MODULE, |
796 | .small_ops = hwsim_nl_ops, |
797 | .n_small_ops = ARRAY_SIZE(hwsim_nl_ops), |
798 | .resv_start_op = MAC802154_HWSIM_CMD_NEW_EDGE + 1, |
799 | .mcgrps = hwsim_mcgrps, |
800 | .n_mcgrps = ARRAY_SIZE(hwsim_mcgrps), |
801 | }; |
802 | |
803 | static void hwsim_mcast_config_msg(struct sk_buff *mcast_skb, |
804 | struct genl_info *info) |
805 | { |
806 | if (info) |
807 | genl_notify(family: &hwsim_genl_family, skb: mcast_skb, info, |
808 | group: HWSIM_MCGRP_CONFIG, GFP_KERNEL); |
809 | else |
810 | genlmsg_multicast(family: &hwsim_genl_family, skb: mcast_skb, portid: 0, |
811 | group: HWSIM_MCGRP_CONFIG, GFP_KERNEL); |
812 | } |
813 | |
814 | static void hwsim_mcast_new_radio(struct genl_info *info, struct hwsim_phy *phy) |
815 | { |
816 | struct sk_buff *mcast_skb; |
817 | void *data; |
818 | |
819 | mcast_skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); |
820 | if (!mcast_skb) |
821 | return; |
822 | |
823 | data = genlmsg_put(skb: mcast_skb, portid: 0, seq: 0, family: &hwsim_genl_family, flags: 0, |
824 | cmd: MAC802154_HWSIM_CMD_NEW_RADIO); |
825 | if (!data) |
826 | goto out_err; |
827 | |
828 | if (append_radio_msg(skb: mcast_skb, phy) < 0) |
829 | goto out_err; |
830 | |
831 | genlmsg_end(skb: mcast_skb, hdr: data); |
832 | |
833 | hwsim_mcast_config_msg(mcast_skb, info); |
834 | return; |
835 | |
836 | out_err: |
837 | genlmsg_cancel(skb: mcast_skb, hdr: data); |
838 | nlmsg_free(skb: mcast_skb); |
839 | } |
840 | |
841 | static void hwsim_edge_unsubscribe_me(struct hwsim_phy *phy) |
842 | { |
843 | struct hwsim_phy *tmp; |
844 | struct hwsim_edge *e; |
845 | |
846 | rcu_read_lock(); |
847 | /* going to all phy edges and remove phy from it */ |
848 | list_for_each_entry(tmp, &hwsim_phys, list) { |
849 | list_for_each_entry_rcu(e, &tmp->edges, list) { |
850 | if (e->endpoint->idx == phy->idx) { |
851 | list_del_rcu(entry: &e->list); |
852 | hwsim_free_edge(e); |
853 | } |
854 | } |
855 | } |
856 | rcu_read_unlock(); |
857 | |
858 | synchronize_rcu(); |
859 | } |
860 | |
861 | static int hwsim_subscribe_all_others(struct hwsim_phy *phy) |
862 | { |
863 | struct hwsim_phy *sub; |
864 | struct hwsim_edge *e; |
865 | |
866 | list_for_each_entry(sub, &hwsim_phys, list) { |
867 | e = hwsim_alloc_edge(endpoint: sub, lqi: 0xff); |
868 | if (!e) |
869 | goto me_fail; |
870 | |
871 | list_add_rcu(new: &e->list, head: &phy->edges); |
872 | } |
873 | |
874 | list_for_each_entry(sub, &hwsim_phys, list) { |
875 | e = hwsim_alloc_edge(endpoint: phy, lqi: 0xff); |
876 | if (!e) |
877 | goto sub_fail; |
878 | |
879 | list_add_rcu(new: &e->list, head: &sub->edges); |
880 | } |
881 | |
882 | return 0; |
883 | |
884 | sub_fail: |
885 | hwsim_edge_unsubscribe_me(phy); |
886 | me_fail: |
887 | rcu_read_lock(); |
888 | list_for_each_entry_rcu(e, &phy->edges, list) { |
889 | list_del_rcu(entry: &e->list); |
890 | hwsim_free_edge(e); |
891 | } |
892 | rcu_read_unlock(); |
893 | return -ENOMEM; |
894 | } |
895 | |
896 | static int hwsim_add_one(struct genl_info *info, struct device *dev, |
897 | bool init) |
898 | { |
899 | struct ieee802154_hw *hw; |
900 | struct hwsim_phy *phy; |
901 | struct hwsim_pib *pib; |
902 | int idx; |
903 | int err; |
904 | |
905 | idx = hwsim_radio_idx++; |
906 | |
907 | hw = ieee802154_alloc_hw(priv_data_len: sizeof(*phy), ops: &hwsim_ops); |
908 | if (!hw) |
909 | return -ENOMEM; |
910 | |
911 | phy = hw->priv; |
912 | phy->hw = hw; |
913 | |
914 | /* 868 MHz BPSK 802.15.4-2003 */ |
915 | hw->phy->supported.channels[0] |= 1; |
916 | /* 915 MHz BPSK 802.15.4-2003 */ |
917 | hw->phy->supported.channels[0] |= 0x7fe; |
918 | /* 2.4 GHz O-QPSK 802.15.4-2003 */ |
919 | hw->phy->supported.channels[0] |= 0x7FFF800; |
920 | /* 868 MHz ASK 802.15.4-2006 */ |
921 | hw->phy->supported.channels[1] |= 1; |
922 | /* 915 MHz ASK 802.15.4-2006 */ |
923 | hw->phy->supported.channels[1] |= 0x7fe; |
924 | /* 868 MHz O-QPSK 802.15.4-2006 */ |
925 | hw->phy->supported.channels[2] |= 1; |
926 | /* 915 MHz O-QPSK 802.15.4-2006 */ |
927 | hw->phy->supported.channels[2] |= 0x7fe; |
928 | /* 2.4 GHz CSS 802.15.4a-2007 */ |
929 | hw->phy->supported.channels[3] |= 0x3fff; |
930 | /* UWB Sub-gigahertz 802.15.4a-2007 */ |
931 | hw->phy->supported.channels[4] |= 1; |
932 | /* UWB Low band 802.15.4a-2007 */ |
933 | hw->phy->supported.channels[4] |= 0x1e; |
934 | /* UWB High band 802.15.4a-2007 */ |
935 | hw->phy->supported.channels[4] |= 0xffe0; |
936 | /* 750 MHz O-QPSK 802.15.4c-2009 */ |
937 | hw->phy->supported.channels[5] |= 0xf; |
938 | /* 750 MHz MPSK 802.15.4c-2009 */ |
939 | hw->phy->supported.channels[5] |= 0xf0; |
940 | /* 950 MHz BPSK 802.15.4d-2009 */ |
941 | hw->phy->supported.channels[6] |= 0x3ff; |
942 | /* 950 MHz GFSK 802.15.4d-2009 */ |
943 | hw->phy->supported.channels[6] |= 0x3ffc00; |
944 | |
945 | ieee802154_random_extended_addr(addr: &hw->phy->perm_extended_addr); |
946 | |
947 | /* hwsim phy channel 13 as default */ |
948 | hw->phy->current_channel = 13; |
949 | pib = kzalloc(size: sizeof(*pib), GFP_KERNEL); |
950 | if (!pib) { |
951 | err = -ENOMEM; |
952 | goto err_pib; |
953 | } |
954 | |
955 | pib->channel = 13; |
956 | pib->filt.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST); |
957 | pib->filt.pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST); |
958 | rcu_assign_pointer(phy->pib, pib); |
959 | phy->idx = idx; |
960 | INIT_LIST_HEAD(list: &phy->edges); |
961 | |
962 | hw->flags = IEEE802154_HW_PROMISCUOUS; |
963 | hw->parent = dev; |
964 | |
965 | err = ieee802154_register_hw(hw); |
966 | if (err) |
967 | goto err_reg; |
968 | |
969 | mutex_lock(&hwsim_phys_lock); |
970 | if (init) { |
971 | err = hwsim_subscribe_all_others(phy); |
972 | if (err < 0) { |
973 | mutex_unlock(lock: &hwsim_phys_lock); |
974 | goto err_subscribe; |
975 | } |
976 | } |
977 | list_add_tail(new: &phy->list, head: &hwsim_phys); |
978 | mutex_unlock(lock: &hwsim_phys_lock); |
979 | |
980 | hwsim_mcast_new_radio(info, phy); |
981 | |
982 | return idx; |
983 | |
984 | err_subscribe: |
985 | ieee802154_unregister_hw(hw: phy->hw); |
986 | err_reg: |
987 | kfree(objp: pib); |
988 | err_pib: |
989 | ieee802154_free_hw(hw: phy->hw); |
990 | return err; |
991 | } |
992 | |
993 | static void hwsim_del(struct hwsim_phy *phy) |
994 | { |
995 | struct hwsim_pib *pib; |
996 | struct hwsim_edge *e; |
997 | |
998 | hwsim_edge_unsubscribe_me(phy); |
999 | |
1000 | list_del(entry: &phy->list); |
1001 | |
1002 | rcu_read_lock(); |
1003 | list_for_each_entry_rcu(e, &phy->edges, list) { |
1004 | list_del_rcu(entry: &e->list); |
1005 | hwsim_free_edge(e); |
1006 | } |
1007 | pib = rcu_dereference(phy->pib); |
1008 | rcu_read_unlock(); |
1009 | |
1010 | kfree_rcu(pib, rcu); |
1011 | |
1012 | ieee802154_unregister_hw(hw: phy->hw); |
1013 | ieee802154_free_hw(hw: phy->hw); |
1014 | } |
1015 | |
1016 | static int hwsim_probe(struct platform_device *pdev) |
1017 | { |
1018 | struct hwsim_phy *phy, *tmp; |
1019 | int err, i; |
1020 | |
1021 | for (i = 0; i < 2; i++) { |
1022 | err = hwsim_add_one(NULL, dev: &pdev->dev, init: true); |
1023 | if (err < 0) |
1024 | goto err_slave; |
1025 | } |
1026 | |
1027 | dev_info(&pdev->dev, "Added 2 mac802154 hwsim hardware radios\n" ); |
1028 | return 0; |
1029 | |
1030 | err_slave: |
1031 | mutex_lock(&hwsim_phys_lock); |
1032 | list_for_each_entry_safe(phy, tmp, &hwsim_phys, list) |
1033 | hwsim_del(phy); |
1034 | mutex_unlock(lock: &hwsim_phys_lock); |
1035 | return err; |
1036 | } |
1037 | |
1038 | static int hwsim_remove(struct platform_device *pdev) |
1039 | { |
1040 | struct hwsim_phy *phy, *tmp; |
1041 | |
1042 | mutex_lock(&hwsim_phys_lock); |
1043 | list_for_each_entry_safe(phy, tmp, &hwsim_phys, list) |
1044 | hwsim_del(phy); |
1045 | mutex_unlock(lock: &hwsim_phys_lock); |
1046 | |
1047 | return 0; |
1048 | } |
1049 | |
1050 | static struct platform_driver mac802154hwsim_driver = { |
1051 | .probe = hwsim_probe, |
1052 | .remove = hwsim_remove, |
1053 | .driver = { |
1054 | .name = "mac802154_hwsim" , |
1055 | }, |
1056 | }; |
1057 | |
1058 | static __init int hwsim_init_module(void) |
1059 | { |
1060 | int rc; |
1061 | |
1062 | rc = genl_register_family(family: &hwsim_genl_family); |
1063 | if (rc) |
1064 | return rc; |
1065 | |
1066 | mac802154hwsim_dev = platform_device_register_simple(name: "mac802154_hwsim" , |
1067 | id: -1, NULL, num: 0); |
1068 | if (IS_ERR(ptr: mac802154hwsim_dev)) { |
1069 | rc = PTR_ERR(ptr: mac802154hwsim_dev); |
1070 | goto platform_dev; |
1071 | } |
1072 | |
1073 | rc = platform_driver_register(&mac802154hwsim_driver); |
1074 | if (rc < 0) |
1075 | goto platform_drv; |
1076 | |
1077 | return 0; |
1078 | |
1079 | platform_drv: |
1080 | platform_device_unregister(mac802154hwsim_dev); |
1081 | platform_dev: |
1082 | genl_unregister_family(family: &hwsim_genl_family); |
1083 | return rc; |
1084 | } |
1085 | |
1086 | static __exit void hwsim_remove_module(void) |
1087 | { |
1088 | genl_unregister_family(family: &hwsim_genl_family); |
1089 | platform_driver_unregister(&mac802154hwsim_driver); |
1090 | platform_device_unregister(mac802154hwsim_dev); |
1091 | } |
1092 | |
1093 | module_init(hwsim_init_module); |
1094 | module_exit(hwsim_remove_module); |
1095 | |