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