1 /*
2  * Copyright (C) 2007, 2008, 2009 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  * Written by:
14  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
15  */
16 
17 #ifndef __NET_CFG802154_H
18 #define __NET_CFG802154_H
19 
20 #include <linux/ieee802154.h>
21 #include <linux/netdevice.h>
22 #include <linux/mutex.h>
23 #include <linux/bug.h>
24 
25 #include <net/nl802154.h>
26 
27 struct wpan_phy;
28 struct wpan_phy_cca;
29 
30 #ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
31 struct ieee802154_llsec_device_key;
32 struct ieee802154_llsec_seclevel;
33 struct ieee802154_llsec_params;
34 struct ieee802154_llsec_device;
35 struct ieee802154_llsec_table;
36 struct ieee802154_llsec_key_id;
37 struct ieee802154_llsec_key;
38 #endif /* CONFIG_IEEE802154_NL802154_EXPERIMENTAL */
39 
40 struct cfg802154_ops {
41 	struct net_device * (*add_virtual_intf_deprecated)(struct wpan_phy *wpan_phy,
42 							   const char *name,
43 							   unsigned char name_assign_type,
44 							   int type);
45 	void	(*del_virtual_intf_deprecated)(struct wpan_phy *wpan_phy,
46 					       struct net_device *dev);
47 	int	(*suspend)(struct wpan_phy *wpan_phy);
48 	int	(*resume)(struct wpan_phy *wpan_phy);
49 	int	(*add_virtual_intf)(struct wpan_phy *wpan_phy,
50 				    const char *name,
51 				    unsigned char name_assign_type,
52 				    enum nl802154_iftype type,
53 				    __le64 extended_addr);
54 	int	(*del_virtual_intf)(struct wpan_phy *wpan_phy,
55 				    struct wpan_dev *wpan_dev);
56 	int	(*set_channel)(struct wpan_phy *wpan_phy, u8 page, u8 channel);
57 	int	(*set_cca_mode)(struct wpan_phy *wpan_phy,
58 				const struct wpan_phy_cca *cca);
59 	int     (*set_cca_ed_level)(struct wpan_phy *wpan_phy, s32 ed_level);
60 	int     (*set_tx_power)(struct wpan_phy *wpan_phy, s32 power);
61 	int	(*set_pan_id)(struct wpan_phy *wpan_phy,
62 			      struct wpan_dev *wpan_dev, __le16 pan_id);
63 	int	(*set_short_addr)(struct wpan_phy *wpan_phy,
64 				  struct wpan_dev *wpan_dev, __le16 short_addr);
65 	int	(*set_backoff_exponent)(struct wpan_phy *wpan_phy,
66 					struct wpan_dev *wpan_dev, u8 min_be,
67 					u8 max_be);
68 	int	(*set_max_csma_backoffs)(struct wpan_phy *wpan_phy,
69 					 struct wpan_dev *wpan_dev,
70 					 u8 max_csma_backoffs);
71 	int	(*set_max_frame_retries)(struct wpan_phy *wpan_phy,
72 					 struct wpan_dev *wpan_dev,
73 					 s8 max_frame_retries);
74 	int	(*set_lbt_mode)(struct wpan_phy *wpan_phy,
75 				struct wpan_dev *wpan_dev, bool mode);
76 	int	(*set_ackreq_default)(struct wpan_phy *wpan_phy,
77 				      struct wpan_dev *wpan_dev, bool ackreq);
78 #ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
79 	void	(*get_llsec_table)(struct wpan_phy *wpan_phy,
80 				   struct wpan_dev *wpan_dev,
81 				   struct ieee802154_llsec_table **table);
82 	void	(*lock_llsec_table)(struct wpan_phy *wpan_phy,
83 				    struct wpan_dev *wpan_dev);
84 	void	(*unlock_llsec_table)(struct wpan_phy *wpan_phy,
85 				      struct wpan_dev *wpan_dev);
86 	/* TODO remove locking/get table callbacks, this is part of the
87 	 * nl802154 interface and should be accessible from ieee802154 layer.
88 	 */
89 	int	(*get_llsec_params)(struct wpan_phy *wpan_phy,
90 				    struct wpan_dev *wpan_dev,
91 				    struct ieee802154_llsec_params *params);
92 	int	(*set_llsec_params)(struct wpan_phy *wpan_phy,
93 				    struct wpan_dev *wpan_dev,
94 				    const struct ieee802154_llsec_params *params,
95 				    int changed);
96 	int	(*add_llsec_key)(struct wpan_phy *wpan_phy,
97 				 struct wpan_dev *wpan_dev,
98 				 const struct ieee802154_llsec_key_id *id,
99 				 const struct ieee802154_llsec_key *key);
100 	int	(*del_llsec_key)(struct wpan_phy *wpan_phy,
101 				 struct wpan_dev *wpan_dev,
102 				 const struct ieee802154_llsec_key_id *id);
103 	int	(*add_seclevel)(struct wpan_phy *wpan_phy,
104 				 struct wpan_dev *wpan_dev,
105 				 const struct ieee802154_llsec_seclevel *sl);
106 	int	(*del_seclevel)(struct wpan_phy *wpan_phy,
107 				 struct wpan_dev *wpan_dev,
108 				 const struct ieee802154_llsec_seclevel *sl);
109 	int	(*add_device)(struct wpan_phy *wpan_phy,
110 			      struct wpan_dev *wpan_dev,
111 			      const struct ieee802154_llsec_device *dev);
112 	int	(*del_device)(struct wpan_phy *wpan_phy,
113 			      struct wpan_dev *wpan_dev, __le64 extended_addr);
114 	int	(*add_devkey)(struct wpan_phy *wpan_phy,
115 			      struct wpan_dev *wpan_dev,
116 			      __le64 extended_addr,
117 			      const struct ieee802154_llsec_device_key *key);
118 	int	(*del_devkey)(struct wpan_phy *wpan_phy,
119 			      struct wpan_dev *wpan_dev,
120 			      __le64 extended_addr,
121 			      const struct ieee802154_llsec_device_key *key);
122 #endif /* CONFIG_IEEE802154_NL802154_EXPERIMENTAL */
123 };
124 
125 static inline bool
wpan_phy_supported_bool(bool b,enum nl802154_supported_bool_states st)126 wpan_phy_supported_bool(bool b, enum nl802154_supported_bool_states st)
127 {
128 	switch (st) {
129 	case NL802154_SUPPORTED_BOOL_TRUE:
130 		return b;
131 	case NL802154_SUPPORTED_BOOL_FALSE:
132 		return !b;
133 	case NL802154_SUPPORTED_BOOL_BOTH:
134 		return true;
135 	default:
136 		WARN_ON(1);
137 	}
138 
139 	return false;
140 }
141 
142 struct wpan_phy_supported {
143 	u32 channels[IEEE802154_MAX_PAGE + 1],
144 	    cca_modes, cca_opts, iftypes;
145 	enum nl802154_supported_bool_states lbt;
146 	u8 min_minbe, max_minbe, min_maxbe, max_maxbe,
147 	   min_csma_backoffs, max_csma_backoffs;
148 	s8 min_frame_retries, max_frame_retries;
149 	size_t tx_powers_size, cca_ed_levels_size;
150 	const s32 *tx_powers, *cca_ed_levels;
151 };
152 
153 struct wpan_phy_cca {
154 	enum nl802154_cca_modes mode;
155 	enum nl802154_cca_opts opt;
156 };
157 
158 static inline bool
wpan_phy_cca_cmp(const struct wpan_phy_cca * a,const struct wpan_phy_cca * b)159 wpan_phy_cca_cmp(const struct wpan_phy_cca *a, const struct wpan_phy_cca *b)
160 {
161 	if (a->mode != b->mode)
162 		return false;
163 
164 	if (a->mode == NL802154_CCA_ENERGY_CARRIER)
165 		return a->opt == b->opt;
166 
167 	return true;
168 }
169 
170 /**
171  * @WPAN_PHY_FLAG_TRANSMIT_POWER: Indicates that transceiver will support
172  *	transmit power setting.
173  * @WPAN_PHY_FLAG_CCA_ED_LEVEL: Indicates that transceiver will support cca ed
174  *	level setting.
175  * @WPAN_PHY_FLAG_CCA_MODE: Indicates that transceiver will support cca mode
176  *	setting.
177  */
178 enum wpan_phy_flags {
179 	WPAN_PHY_FLAG_TXPOWER		= BIT(1),
180 	WPAN_PHY_FLAG_CCA_ED_LEVEL	= BIT(2),
181 	WPAN_PHY_FLAG_CCA_MODE		= BIT(3),
182 };
183 
184 struct wpan_phy {
185 	/* If multiple wpan_phys are registered and you're handed e.g.
186 	 * a regular netdev with assigned ieee802154_ptr, you won't
187 	 * know whether it points to a wpan_phy your driver has registered
188 	 * or not. Assign this to something global to your driver to
189 	 * help determine whether you own this wpan_phy or not.
190 	 */
191 	const void *privid;
192 
193 	u32 flags;
194 
195 	/*
196 	 * This is a PIB according to 802.15.4-2011.
197 	 * We do not provide timing-related variables, as they
198 	 * aren't used outside of driver
199 	 */
200 	u8 current_channel;
201 	u8 current_page;
202 	struct wpan_phy_supported supported;
203 	/* current transmit_power in mBm */
204 	s32 transmit_power;
205 	struct wpan_phy_cca cca;
206 
207 	__le64 perm_extended_addr;
208 
209 	/* current cca ed threshold in mBm */
210 	s32 cca_ed_level;
211 
212 	/* PHY depended MAC PIB values */
213 
214 	/* 802.15.4 acronym: Tdsym in usec */
215 	u8 symbol_duration;
216 	/* lifs and sifs periods timing */
217 	u16 lifs_period;
218 	u16 sifs_period;
219 
220 	struct device dev;
221 
222 	/* the network namespace this phy lives in currently */
223 	possible_net_t _net;
224 
225 	char priv[0] __aligned(NETDEV_ALIGN);
226 };
227 
wpan_phy_net(struct wpan_phy * wpan_phy)228 static inline struct net *wpan_phy_net(struct wpan_phy *wpan_phy)
229 {
230 	return read_pnet(&wpan_phy->_net);
231 }
232 
wpan_phy_net_set(struct wpan_phy * wpan_phy,struct net * net)233 static inline void wpan_phy_net_set(struct wpan_phy *wpan_phy, struct net *net)
234 {
235 	write_pnet(&wpan_phy->_net, net);
236 }
237 
238 struct ieee802154_addr {
239 	u8 mode;
240 	__le16 pan_id;
241 	union {
242 		__le16 short_addr;
243 		__le64 extended_addr;
244 	};
245 };
246 
247 struct ieee802154_llsec_key_id {
248 	u8 mode;
249 	u8 id;
250 	union {
251 		struct ieee802154_addr device_addr;
252 		__le32 short_source;
253 		__le64 extended_source;
254 	};
255 };
256 
257 #define IEEE802154_LLSEC_KEY_SIZE 16
258 
259 struct ieee802154_llsec_key {
260 	u8 frame_types;
261 	u32 cmd_frame_ids;
262 	/* TODO replace with NL802154_KEY_SIZE */
263 	u8 key[IEEE802154_LLSEC_KEY_SIZE];
264 };
265 
266 struct ieee802154_llsec_key_entry {
267 	struct list_head list;
268 
269 	struct ieee802154_llsec_key_id id;
270 	struct ieee802154_llsec_key *key;
271 };
272 
273 struct ieee802154_llsec_params {
274 	bool enabled;
275 
276 	__be32 frame_counter;
277 	u8 out_level;
278 	struct ieee802154_llsec_key_id out_key;
279 
280 	__le64 default_key_source;
281 
282 	__le16 pan_id;
283 	__le64 hwaddr;
284 	__le64 coord_hwaddr;
285 	__le16 coord_shortaddr;
286 };
287 
288 struct ieee802154_llsec_table {
289 	struct list_head keys;
290 	struct list_head devices;
291 	struct list_head security_levels;
292 };
293 
294 struct ieee802154_llsec_seclevel {
295 	struct list_head list;
296 
297 	u8 frame_type;
298 	u8 cmd_frame_id;
299 	bool device_override;
300 	u32 sec_levels;
301 };
302 
303 struct ieee802154_llsec_device {
304 	struct list_head list;
305 
306 	__le16 pan_id;
307 	__le16 short_addr;
308 	__le64 hwaddr;
309 	u32 frame_counter;
310 	bool seclevel_exempt;
311 
312 	u8 key_mode;
313 	struct list_head keys;
314 };
315 
316 struct ieee802154_llsec_device_key {
317 	struct list_head list;
318 
319 	struct ieee802154_llsec_key_id key_id;
320 	u32 frame_counter;
321 };
322 
323 struct wpan_dev_header_ops {
324 	/* TODO create callback currently assumes ieee802154_mac_cb inside
325 	 * skb->cb. This should be changed to give these information as
326 	 * parameter.
327 	 */
328 	int	(*create)(struct sk_buff *skb, struct net_device *dev,
329 			  const struct ieee802154_addr *daddr,
330 			  const struct ieee802154_addr *saddr,
331 			  unsigned int len);
332 };
333 
334 struct wpan_dev {
335 	struct wpan_phy *wpan_phy;
336 	int iftype;
337 
338 	/* the remainder of this struct should be private to cfg802154 */
339 	struct list_head list;
340 	struct net_device *netdev;
341 
342 	const struct wpan_dev_header_ops *header_ops;
343 
344 	/* lowpan interface, set when the wpan_dev belongs to one lowpan_dev */
345 	struct net_device *lowpan_dev;
346 
347 	u32 identifier;
348 
349 	/* MAC PIB */
350 	__le16 pan_id;
351 	__le16 short_addr;
352 	__le64 extended_addr;
353 
354 	/* MAC BSN field */
355 	atomic_t bsn;
356 	/* MAC DSN field */
357 	atomic_t dsn;
358 
359 	u8 min_be;
360 	u8 max_be;
361 	u8 csma_retries;
362 	s8 frame_retries;
363 
364 	bool lbt;
365 
366 	bool promiscuous_mode;
367 
368 	/* fallback for acknowledgment bit setting */
369 	bool ackreq;
370 };
371 
372 #define to_phy(_dev)	container_of(_dev, struct wpan_phy, dev)
373 
374 static inline int
wpan_dev_hard_header(struct sk_buff * skb,struct net_device * dev,const struct ieee802154_addr * daddr,const struct ieee802154_addr * saddr,unsigned int len)375 wpan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
376 		     const struct ieee802154_addr *daddr,
377 		     const struct ieee802154_addr *saddr,
378 		     unsigned int len)
379 {
380 	struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
381 
382 	return wpan_dev->header_ops->create(skb, dev, daddr, saddr, len);
383 }
384 
385 struct wpan_phy *
386 wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size);
wpan_phy_set_dev(struct wpan_phy * phy,struct device * dev)387 static inline void wpan_phy_set_dev(struct wpan_phy *phy, struct device *dev)
388 {
389 	phy->dev.parent = dev;
390 }
391 
392 int wpan_phy_register(struct wpan_phy *phy);
393 void wpan_phy_unregister(struct wpan_phy *phy);
394 void wpan_phy_free(struct wpan_phy *phy);
395 /* Same semantics as for class_for_each_device */
396 int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data), void *data);
397 
wpan_phy_priv(struct wpan_phy * phy)398 static inline void *wpan_phy_priv(struct wpan_phy *phy)
399 {
400 	BUG_ON(!phy);
401 	return &phy->priv;
402 }
403 
404 struct wpan_phy *wpan_phy_find(const char *str);
405 
wpan_phy_put(struct wpan_phy * phy)406 static inline void wpan_phy_put(struct wpan_phy *phy)
407 {
408 	put_device(&phy->dev);
409 }
410 
wpan_phy_name(struct wpan_phy * phy)411 static inline const char *wpan_phy_name(struct wpan_phy *phy)
412 {
413 	return dev_name(&phy->dev);
414 }
415 
416 #endif /* __NET_CFG802154_H */
417