1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * IEEE802.15.4-2003 specification
4 *
5 * Copyright (C) 2007-2012 Siemens AG
6 */
7 #ifndef NET_MAC802154_H
8 #define NET_MAC802154_H
9
10 #include <asm/unaligned.h>
11 #include <net/af_ieee802154.h>
12 #include <linux/ieee802154.h>
13 #include <linux/skbuff.h>
14
15 #include <net/cfg802154.h>
16
17 /**
18 * enum ieee802154_hw_addr_filt_flags - hardware address filtering flags
19 *
20 * The following flags are used to indicate changed address settings from
21 * the stack to the hardware.
22 *
23 * @IEEE802154_AFILT_SADDR_CHANGED: Indicates that the short address will be
24 * change.
25 *
26 * @IEEE802154_AFILT_IEEEADDR_CHANGED: Indicates that the extended address
27 * will be change.
28 *
29 * @IEEE802154_AFILT_PANID_CHANGED: Indicates that the pan id will be change.
30 *
31 * @IEEE802154_AFILT_PANC_CHANGED: Indicates that the address filter will
32 * do frame address filtering as a pan coordinator.
33 */
34 enum ieee802154_hw_addr_filt_flags {
35 IEEE802154_AFILT_SADDR_CHANGED = BIT(0),
36 IEEE802154_AFILT_IEEEADDR_CHANGED = BIT(1),
37 IEEE802154_AFILT_PANID_CHANGED = BIT(2),
38 IEEE802154_AFILT_PANC_CHANGED = BIT(3),
39 };
40
41 /**
42 * struct ieee802154_hw_addr_filt - hardware address filtering settings
43 *
44 * @pan_id: pan_id which should be set to the hardware address filter.
45 *
46 * @short_addr: short_addr which should be set to the hardware address filter.
47 *
48 * @ieee_addr: extended address which should be set to the hardware address
49 * filter.
50 *
51 * @pan_coord: boolean if hardware filtering should be operate as coordinator.
52 */
53 struct ieee802154_hw_addr_filt {
54 __le16 pan_id;
55 __le16 short_addr;
56 __le64 ieee_addr;
57 bool pan_coord;
58 };
59
60 /**
61 * struct ieee802154_hw - ieee802154 hardware
62 *
63 * @extra_tx_headroom: headroom to reserve in each transmit skb for use by the
64 * driver (e.g. for transmit headers.)
65 *
66 * @flags: hardware flags, see &enum ieee802154_hw_flags
67 *
68 * @parent: parent device of the hardware.
69 *
70 * @priv: pointer to private area that was allocated for driver use along with
71 * this structure.
72 *
73 * @phy: This points to the &struct wpan_phy allocated for this 802.15.4 PHY.
74 */
75 struct ieee802154_hw {
76 /* filled by the driver */
77 int extra_tx_headroom;
78 u32 flags;
79 struct device *parent;
80 void *priv;
81
82 /* filled by mac802154 core */
83 struct wpan_phy *phy;
84 };
85
86 /**
87 * enum ieee802154_hw_flags - hardware flags
88 *
89 * These flags are used to indicate hardware capabilities to
90 * the stack. Generally, flags here should have their meaning
91 * done in a way that the simplest hardware doesn't need setting
92 * any particular flags. There are some exceptions to this rule,
93 * however, so you are advised to review these flags carefully.
94 *
95 * @IEEE802154_HW_TX_OMIT_CKSUM: Indicates that xmitter will add FCS on it's
96 * own.
97 *
98 * @IEEE802154_HW_LBT: Indicates that transceiver will support listen before
99 * transmit.
100 *
101 * @IEEE802154_HW_CSMA_PARAMS: Indicates that transceiver will support csma
102 * parameters (max_be, min_be, backoff exponents).
103 *
104 * @IEEE802154_HW_FRAME_RETRIES: Indicates that transceiver will support ARET
105 * frame retries setting.
106 *
107 * @IEEE802154_HW_AFILT: Indicates that transceiver will support hardware
108 * address filter setting.
109 *
110 * @IEEE802154_HW_PROMISCUOUS: Indicates that transceiver will support
111 * promiscuous mode setting.
112 *
113 * @IEEE802154_HW_RX_OMIT_CKSUM: Indicates that receiver omits FCS.
114 */
115 enum ieee802154_hw_flags {
116 IEEE802154_HW_TX_OMIT_CKSUM = BIT(0),
117 IEEE802154_HW_LBT = BIT(1),
118 IEEE802154_HW_CSMA_PARAMS = BIT(2),
119 IEEE802154_HW_FRAME_RETRIES = BIT(3),
120 IEEE802154_HW_AFILT = BIT(4),
121 IEEE802154_HW_PROMISCUOUS = BIT(5),
122 IEEE802154_HW_RX_OMIT_CKSUM = BIT(6),
123 };
124
125 /* Indicates that receiver omits FCS and xmitter will add FCS on it's own. */
126 #define IEEE802154_HW_OMIT_CKSUM (IEEE802154_HW_TX_OMIT_CKSUM | \
127 IEEE802154_HW_RX_OMIT_CKSUM)
128
129 /* struct ieee802154_ops - callbacks from mac802154 to the driver
130 *
131 * This structure contains various callbacks that the driver may
132 * handle or, in some cases, must handle, for example to transmit
133 * a frame.
134 *
135 * start: Handler that 802.15.4 module calls for device initialization.
136 * This function is called before the first interface is attached.
137 *
138 * stop: Handler that 802.15.4 module calls for device cleanup.
139 * This function is called after the last interface is removed.
140 *
141 * xmit_sync:
142 * Handler that 802.15.4 module calls for each transmitted frame.
143 * skb cntains the buffer starting from the IEEE 802.15.4 header.
144 * The low-level driver should send the frame based on available
145 * configuration. This is called by a workqueue and useful for
146 * synchronous 802.15.4 drivers.
147 * This function should return zero or negative errno.
148 *
149 * WARNING:
150 * This will be deprecated soon. We don't accept synced xmit callbacks
151 * drivers anymore.
152 *
153 * xmit_async:
154 * Handler that 802.15.4 module calls for each transmitted frame.
155 * skb cntains the buffer starting from the IEEE 802.15.4 header.
156 * The low-level driver should send the frame based on available
157 * configuration.
158 * This function should return zero or negative errno.
159 *
160 * ed: Handler that 802.15.4 module calls for Energy Detection.
161 * This function should place the value for detected energy
162 * (usually device-dependant) in the level pointer and return
163 * either zero or negative errno. Called with pib_lock held.
164 *
165 * set_channel:
166 * Set radio for listening on specific channel.
167 * Set the device for listening on specified channel.
168 * Returns either zero, or negative errno. Called with pib_lock held.
169 *
170 * set_hw_addr_filt:
171 * Set radio for listening on specific address.
172 * Set the device for listening on specified address.
173 * Returns either zero, or negative errno.
174 *
175 * set_txpower:
176 * Set radio transmit power in mBm. Called with pib_lock held.
177 * Returns either zero, or negative errno.
178 *
179 * set_lbt
180 * Enables or disables listen before talk on the device. Called with
181 * pib_lock held.
182 * Returns either zero, or negative errno.
183 *
184 * set_cca_mode
185 * Sets the CCA mode used by the device. Called with pib_lock held.
186 * Returns either zero, or negative errno.
187 *
188 * set_cca_ed_level
189 * Sets the CCA energy detection threshold in mBm. Called with pib_lock
190 * held.
191 * Returns either zero, or negative errno.
192 *
193 * set_csma_params
194 * Sets the CSMA parameter set for the PHY. Called with pib_lock held.
195 * Returns either zero, or negative errno.
196 *
197 * set_frame_retries
198 * Sets the retransmission attempt limit. Called with pib_lock held.
199 * Returns either zero, or negative errno.
200 *
201 * set_promiscuous_mode
202 * Enables or disable promiscuous mode.
203 */
204 struct ieee802154_ops {
205 struct module *owner;
206 int (*start)(struct ieee802154_hw *hw);
207 void (*stop)(struct ieee802154_hw *hw);
208 int (*xmit_sync)(struct ieee802154_hw *hw,
209 struct sk_buff *skb);
210 int (*xmit_async)(struct ieee802154_hw *hw,
211 struct sk_buff *skb);
212 int (*ed)(struct ieee802154_hw *hw, u8 *level);
213 int (*set_channel)(struct ieee802154_hw *hw, u8 page,
214 u8 channel);
215 int (*set_hw_addr_filt)(struct ieee802154_hw *hw,
216 struct ieee802154_hw_addr_filt *filt,
217 unsigned long changed);
218 int (*set_txpower)(struct ieee802154_hw *hw, s32 mbm);
219 int (*set_lbt)(struct ieee802154_hw *hw, bool on);
220 int (*set_cca_mode)(struct ieee802154_hw *hw,
221 const struct wpan_phy_cca *cca);
222 int (*set_cca_ed_level)(struct ieee802154_hw *hw, s32 mbm);
223 int (*set_csma_params)(struct ieee802154_hw *hw,
224 u8 min_be, u8 max_be, u8 retries);
225 int (*set_frame_retries)(struct ieee802154_hw *hw,
226 s8 retries);
227 int (*set_promiscuous_mode)(struct ieee802154_hw *hw,
228 const bool on);
229 };
230
231 /**
232 * ieee802154_get_fc_from_skb - get the frame control field from an skb
233 * @skb: skb where the frame control field will be get from
234 */
ieee802154_get_fc_from_skb(const struct sk_buff * skb)235 static inline __le16 ieee802154_get_fc_from_skb(const struct sk_buff *skb)
236 {
237 __le16 fc;
238
239 /* check if we can fc at skb_mac_header of sk buffer */
240 if (WARN_ON(!skb_mac_header_was_set(skb) ||
241 (skb_tail_pointer(skb) -
242 skb_mac_header(skb)) < IEEE802154_FC_LEN))
243 return cpu_to_le16(0);
244
245 memcpy(&fc, skb_mac_header(skb), IEEE802154_FC_LEN);
246 return fc;
247 }
248
249 /**
250 * ieee802154_skb_dst_pan - get the pointer to destination pan field
251 * @fc: mac header frame control field
252 * @skb: skb where the destination pan pointer will be get from
253 */
ieee802154_skb_dst_pan(__le16 fc,const struct sk_buff * skb)254 static inline unsigned char *ieee802154_skb_dst_pan(__le16 fc,
255 const struct sk_buff *skb)
256 {
257 unsigned char *dst_pan;
258
259 switch (ieee802154_daddr_mode(fc)) {
260 case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
261 dst_pan = NULL;
262 break;
263 case cpu_to_le16(IEEE802154_FCTL_DADDR_SHORT):
264 case cpu_to_le16(IEEE802154_FCTL_DADDR_EXTENDED):
265 dst_pan = skb_mac_header(skb) +
266 IEEE802154_FC_LEN +
267 IEEE802154_SEQ_LEN;
268 break;
269 default:
270 WARN_ONCE(1, "invalid addr mode detected");
271 dst_pan = NULL;
272 break;
273 }
274
275 return dst_pan;
276 }
277
278 /**
279 * ieee802154_skb_src_pan - get the pointer to source pan field
280 * @fc: mac header frame control field
281 * @skb: skb where the source pan pointer will be get from
282 */
ieee802154_skb_src_pan(__le16 fc,const struct sk_buff * skb)283 static inline unsigned char *ieee802154_skb_src_pan(__le16 fc,
284 const struct sk_buff *skb)
285 {
286 unsigned char *src_pan;
287
288 switch (ieee802154_saddr_mode(fc)) {
289 case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
290 src_pan = NULL;
291 break;
292 case cpu_to_le16(IEEE802154_FCTL_SADDR_SHORT):
293 case cpu_to_le16(IEEE802154_FCTL_SADDR_EXTENDED):
294 /* if intra-pan and source addr mode is non none,
295 * then source pan id is equal destination pan id.
296 */
297 if (ieee802154_is_intra_pan(fc)) {
298 src_pan = ieee802154_skb_dst_pan(fc, skb);
299 break;
300 }
301
302 switch (ieee802154_daddr_mode(fc)) {
303 case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
304 src_pan = skb_mac_header(skb) +
305 IEEE802154_FC_LEN +
306 IEEE802154_SEQ_LEN;
307 break;
308 case cpu_to_le16(IEEE802154_FCTL_DADDR_SHORT):
309 src_pan = skb_mac_header(skb) +
310 IEEE802154_FC_LEN +
311 IEEE802154_SEQ_LEN +
312 IEEE802154_PAN_ID_LEN +
313 IEEE802154_SHORT_ADDR_LEN;
314 break;
315 case cpu_to_le16(IEEE802154_FCTL_DADDR_EXTENDED):
316 src_pan = skb_mac_header(skb) +
317 IEEE802154_FC_LEN +
318 IEEE802154_SEQ_LEN +
319 IEEE802154_PAN_ID_LEN +
320 IEEE802154_EXTENDED_ADDR_LEN;
321 break;
322 default:
323 WARN_ONCE(1, "invalid addr mode detected");
324 src_pan = NULL;
325 break;
326 }
327 break;
328 default:
329 WARN_ONCE(1, "invalid addr mode detected");
330 src_pan = NULL;
331 break;
332 }
333
334 return src_pan;
335 }
336
337 /**
338 * ieee802154_skb_is_intra_pan_addressing - checks whenever the mac addressing
339 * is an intra pan communication
340 * @fc: mac header frame control field
341 * @skb: skb where the source and destination pan should be get from
342 */
ieee802154_skb_is_intra_pan_addressing(__le16 fc,const struct sk_buff * skb)343 static inline bool ieee802154_skb_is_intra_pan_addressing(__le16 fc,
344 const struct sk_buff *skb)
345 {
346 unsigned char *dst_pan = ieee802154_skb_dst_pan(fc, skb),
347 *src_pan = ieee802154_skb_src_pan(fc, skb);
348
349 /* if one is NULL is no intra pan addressing */
350 if (!dst_pan || !src_pan)
351 return false;
352
353 return !memcmp(dst_pan, src_pan, IEEE802154_PAN_ID_LEN);
354 }
355
356 /**
357 * ieee802154_be64_to_le64 - copies and convert be64 to le64
358 * @le64_dst: le64 destination pointer
359 * @be64_src: be64 source pointer
360 */
ieee802154_be64_to_le64(void * le64_dst,const void * be64_src)361 static inline void ieee802154_be64_to_le64(void *le64_dst, const void *be64_src)
362 {
363 put_unaligned_le64(get_unaligned_be64(be64_src), le64_dst);
364 }
365
366 /**
367 * ieee802154_le64_to_be64 - copies and convert le64 to be64
368 * @be64_dst: be64 destination pointer
369 * @le64_src: le64 source pointer
370 */
ieee802154_le64_to_be64(void * be64_dst,const void * le64_src)371 static inline void ieee802154_le64_to_be64(void *be64_dst, const void *le64_src)
372 {
373 put_unaligned_be64(get_unaligned_le64(le64_src), be64_dst);
374 }
375
376 /**
377 * ieee802154_le16_to_be16 - copies and convert le16 to be16
378 * @be16_dst: be16 destination pointer
379 * @le16_src: le16 source pointer
380 */
ieee802154_le16_to_be16(void * be16_dst,const void * le16_src)381 static inline void ieee802154_le16_to_be16(void *be16_dst, const void *le16_src)
382 {
383 put_unaligned_be16(get_unaligned_le16(le16_src), be16_dst);
384 }
385
386 /**
387 * ieee802154_be16_to_le16 - copies and convert be16 to le16
388 * @le16_dst: le16 destination pointer
389 * @be16_src: be16 source pointer
390 */
ieee802154_be16_to_le16(void * le16_dst,const void * be16_src)391 static inline void ieee802154_be16_to_le16(void *le16_dst, const void *be16_src)
392 {
393 put_unaligned_le16(get_unaligned_be16(be16_src), le16_dst);
394 }
395
396 /**
397 * ieee802154_alloc_hw - Allocate a new hardware device
398 *
399 * This must be called once for each hardware device. The returned pointer
400 * must be used to refer to this device when calling other functions.
401 * mac802154 allocates a private data area for the driver pointed to by
402 * @priv in &struct ieee802154_hw, the size of this area is given as
403 * @priv_data_len.
404 *
405 * @priv_data_len: length of private data
406 * @ops: callbacks for this device
407 *
408 * Return: A pointer to the new hardware device, or %NULL on error.
409 */
410 struct ieee802154_hw *
411 ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops);
412
413 /**
414 * ieee802154_free_hw - free hardware descriptor
415 *
416 * This function frees everything that was allocated, including the
417 * private data for the driver. You must call ieee802154_unregister_hw()
418 * before calling this function.
419 *
420 * @hw: the hardware to free
421 */
422 void ieee802154_free_hw(struct ieee802154_hw *hw);
423
424 /**
425 * ieee802154_register_hw - Register hardware device
426 *
427 * You must call this function before any other functions in
428 * mac802154. Note that before a hardware can be registered, you
429 * need to fill the contained wpan_phy's information.
430 *
431 * @hw: the device to register as returned by ieee802154_alloc_hw()
432 *
433 * Return: 0 on success. An error code otherwise.
434 */
435 int ieee802154_register_hw(struct ieee802154_hw *hw);
436
437 /**
438 * ieee802154_unregister_hw - Unregister a hardware device
439 *
440 * This function instructs mac802154 to free allocated resources
441 * and unregister netdevices from the networking subsystem.
442 *
443 * @hw: the hardware to unregister
444 */
445 void ieee802154_unregister_hw(struct ieee802154_hw *hw);
446
447 /**
448 * ieee802154_rx_irqsafe - receive frame
449 *
450 * Like ieee802154_rx() but can be called in IRQ context
451 * (internally defers to a tasklet.)
452 *
453 * @hw: the hardware this frame came in on
454 * @skb: the buffer to receive, owned by mac802154 after this call
455 * @lqi: link quality indicator
456 */
457 void ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb,
458 u8 lqi);
459
460 /**
461 * ieee802154_xmit_complete - frame transmission complete
462 *
463 * @hw: pointer as obtained from ieee802154_alloc_hw().
464 * @skb: buffer for transmission
465 * @ifs_handling: indicate interframe space handling
466 */
467 void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
468 bool ifs_handling);
469
470 /**
471 * ieee802154_xmit_error - offloaded frame transmission failed
472 *
473 * @hw: pointer as obtained from ieee802154_alloc_hw().
474 * @skb: buffer for transmission
475 * @reason: error code
476 */
477 void ieee802154_xmit_error(struct ieee802154_hw *hw, struct sk_buff *skb,
478 int reason);
479
480 /**
481 * ieee802154_xmit_hw_error - frame could not be offloaded to the transmitter
482 * because of a hardware error (bus error, timeout, etc)
483 *
484 * @hw: pointer as obtained from ieee802154_alloc_hw().
485 * @skb: buffer for transmission
486 */
487 void ieee802154_xmit_hw_error(struct ieee802154_hw *hw, struct sk_buff *skb);
488
489 #endif /* NET_MAC802154_H */
490
