20 	[IEEE80211_RADIOTAP_TSFT] = { .align = 8, .size = 8, },
21 	[IEEE80211_RADIOTAP_FLAGS] = { .align = 1, .size = 1, },
22 	[IEEE80211_RADIOTAP_RATE] = { .align = 1, .size = 1, },
23 	[IEEE80211_RADIOTAP_CHANNEL] = { .align = 2, .size = 4, },
24 	[IEEE80211_RADIOTAP_FHSS] = { .align = 2, .size = 2, },
25 	[IEEE80211_RADIOTAP_DBM_ANTSIGNAL] = { .align = 1, .size = 1, },
26 	[IEEE80211_RADIOTAP_DBM_ANTNOISE] = { .align = 1, .size = 1, },
27 	[IEEE80211_RADIOTAP_LOCK_QUALITY] = { .align = 2, .size = 2, },
28 	[IEEE80211_RADIOTAP_TX_ATTENUATION] = { .align = 2, .size = 2, },
29 	[IEEE80211_RADIOTAP_DB_TX_ATTENUATION] = { .align = 2, .size = 2, },
30 	[IEEE80211_RADIOTAP_DBM_TX_POWER] = { .align = 1, .size = 1, },
31 	[IEEE80211_RADIOTAP_ANTENNA] = { .align = 1, .size = 1, },
32 	[IEEE80211_RADIOTAP_DB_ANTSIGNAL] = { .align = 1, .size = 1, },
33 	[IEEE80211_RADIOTAP_DB_ANTNOISE] = { .align = 1, .size = 1, },
34 	[IEEE80211_RADIOTAP_RX_FLAGS] = { .align = 2, .size = 2, },
35 	[IEEE80211_RADIOTAP_TX_FLAGS] = { .align = 2, .size = 2, },
36 	[IEEE80211_RADIOTAP_RTS_RETRIES] = { .align = 1, .size = 1, },
37 	[IEEE80211_RADIOTAP_DATA_RETRIES] = { .align = 1, .size = 1, },
38 	[IEEE80211_RADIOTAP_MCS] = { .align = 1, .size = 3, },
39 	[IEEE80211_RADIOTAP_AMPDU_STATUS] = { .align = 4, .size = 8, },
40 	[IEEE80211_RADIOTAP_VHT] = { .align = 2, .size = 12, },
41 	[IEEE80211_RADIOTAP_TIMESTAMP] = { .align = 8, .size = 12, },
53  * ieee80211_radiotap_iterator_init - radiotap parser iterator initialization
66  * call __ieee80211_radiotap_iterator_init() to init a semi-opaque iterator
70  * -ENOENT if there are no more args to parse, or -EINVAL if there is a problem.
77  * You can find the CPU-endian total radiotap header length in
78  * iterator->max_length after executing ieee80211_radiotap_iterator_init()
97 		return -EINVAL;  in ieee80211_radiotap_iterator_init()
100 	if (radiotap_header->it_version)  in ieee80211_radiotap_iterator_init()
101 		return -EINVAL;  in ieee80211_radiotap_iterator_init()
104 	if (max_length < get_unaligned_le16(&radiotap_header->it_len))  in ieee80211_radiotap_iterator_init()
105 		return -EINVAL;  in ieee80211_radiotap_iterator_init()
107 	iterator->_rtheader = radiotap_header;  in ieee80211_radiotap_iterator_init()
108 	iterator->_max_length = get_unaligned_le16(&radiotap_header->it_len);  in ieee80211_radiotap_iterator_init()
109 	iterator->_arg_index = 0;  in ieee80211_radiotap_iterator_init()
110 	iterator->_bitmap_shifter = get_unaligned_le32(&radiotap_header->it_present);  in ieee80211_radiotap_iterator_init()
111 	iterator->_arg = (uint8_t *)radiotap_header + sizeof(*radiotap_header);  in ieee80211_radiotap_iterator_init()
112 	iterator->_next_ns_data = NULL;  in ieee80211_radiotap_iterator_init()
113 	iterator->_reset_on_ext = 0;  in ieee80211_radiotap_iterator_init()
114 …iterator->_next_bitmap = (le32 *) (((u8 *) radiotap_header) + offsetof(struct ieee80211_radiotap_h…  in ieee80211_radiotap_iterator_init()
115 	iterator->_next_bitmap++;  in ieee80211_radiotap_iterator_init()
116 	iterator->_vns = vns;  in ieee80211_radiotap_iterator_init()
117 	iterator->current_namespace = &radiotap_ns;  in ieee80211_radiotap_iterator_init()
118 	iterator->is_radiotap_ns = 1;  in ieee80211_radiotap_iterator_init()
120 	iterator->n_overrides = 0;  in ieee80211_radiotap_iterator_init()
121 	iterator->overrides = NULL;  in ieee80211_radiotap_iterator_init()
126 	if (iterator->_bitmap_shifter & BIT(IEEE80211_RADIOTAP_EXT)) {  in ieee80211_radiotap_iterator_init()
127 		if ((unsigned long)iterator->_arg -  in ieee80211_radiotap_iterator_init()
128 		    (unsigned long)iterator->_rtheader + sizeof(uint32_t) >  in ieee80211_radiotap_iterator_init()
129 		    (unsigned long)iterator->_max_length)  in ieee80211_radiotap_iterator_init()
130 			return -EINVAL;  in ieee80211_radiotap_iterator_init()
131 		while (get_unaligned_le32(iterator->_arg) &  in ieee80211_radiotap_iterator_init()
133 			iterator->_arg += sizeof(uint32_t);  in ieee80211_radiotap_iterator_init()
141 			if ((unsigned long)iterator->_arg -  in ieee80211_radiotap_iterator_init()
142 			    (unsigned long)iterator->_rtheader +  in ieee80211_radiotap_iterator_init()
144 			    (unsigned long)iterator->_max_length)  in ieee80211_radiotap_iterator_init()
145 				return -EINVAL;  in ieee80211_radiotap_iterator_init()
148 		iterator->_arg += sizeof(uint32_t);  in ieee80211_radiotap_iterator_init()
157 	iterator->this_arg = iterator->_arg;  in ieee80211_radiotap_iterator_init()
158 	iterator->this_arg_index = 0;  in ieee80211_radiotap_iterator_init()
159 	iterator->this_arg_size = 0;  in ieee80211_radiotap_iterator_init()
171 	iterator->current_namespace = NULL;  in find_ns()
173 	if (!iterator->_vns)  in find_ns()
176 	for (i = 0; i < iterator->_vns->n_ns; i++) {  in find_ns()
177 		if (iterator->_vns->ns[i].oui != oui)  in find_ns()
179 		if (iterator->_vns->ns[i].subns != subns)  in find_ns()
182 		iterator->current_namespace = &iterator->_vns->ns[i];  in find_ns()
189 			 int *align, int *size)  in find_override()  argument
193 	if (!iterator->overrides)  in find_override()
196 	for (i = 0; i < iterator->n_overrides; i++) {  in find_override()
197 		if (iterator->_arg_index == iterator->overrides[i].field) {  in find_override()
198 			*align = iterator->overrides[i].align;  in find_override()
199 			*size = iterator->overrides[i].size;  in find_override()
200 			if (!*align) /* erroneous override */  in find_override()
212  * ieee80211_radiotap_iterator_next - return next radiotap parser iterator arg
216  * -ENOENT if there are no more args or -EINVAL
225  * little-endian format whatever the endianness of your CPU.
239 		int pad, align, size, subns;  in ieee80211_radiotap_iterator_next()  local
243 		if ((iterator->_arg_index % 32) == IEEE80211_RADIOTAP_EXT &&  in ieee80211_radiotap_iterator_next()
244 		    !(iterator->_bitmap_shifter & 1))  in ieee80211_radiotap_iterator_next()
245 			return -ENOENT;  in ieee80211_radiotap_iterator_next()
247 		if (!(iterator->_bitmap_shifter & 1))  in ieee80211_radiotap_iterator_next()
250 		/* get alignment/size of data */  in ieee80211_radiotap_iterator_next()
251 		switch (iterator->_arg_index % 32) {  in ieee80211_radiotap_iterator_next()
254 			align = 1;  in ieee80211_radiotap_iterator_next()
255 			size = 0;  in ieee80211_radiotap_iterator_next()
258 			align = 2;  in ieee80211_radiotap_iterator_next()
259 			size = 6;  in ieee80211_radiotap_iterator_next()
263 			if (find_override(iterator, &align, &size)) {  in ieee80211_radiotap_iterator_next()
267 			if (!iterator->current_namespace ||  in ieee80211_radiotap_iterator_next()
268 			    iterator->_arg_index >= iterator->current_namespace->n_bits) {  in ieee80211_radiotap_iterator_next()
269 				if (iterator->current_namespace == &radiotap_ns)  in ieee80211_radiotap_iterator_next()
270 					return -ENOENT;  in ieee80211_radiotap_iterator_next()
271 				align = 0;  in ieee80211_radiotap_iterator_next()
273 				align = iterator->current_namespace->align_size[iterator->_arg_index].align;  in ieee80211_radiotap_iterator_next()
274 				size = iterator->current_namespace->align_size[iterator->_arg_index].size;  in ieee80211_radiotap_iterator_next()
276 			if (!align) {  in ieee80211_radiotap_iterator_next()
278 				iterator->_arg = iterator->_next_ns_data;  in ieee80211_radiotap_iterator_next()
280 				iterator->current_namespace = NULL;  in ieee80211_radiotap_iterator_next()
298 		pad = ((unsigned long)iterator->_arg -  in ieee80211_radiotap_iterator_next()
299 		       (unsigned long)iterator->_rtheader) & (align - 1);  in ieee80211_radiotap_iterator_next()
302 			iterator->_arg += align - pad;  in ieee80211_radiotap_iterator_next()
304 		if (iterator->_arg_index % 32 == IEEE80211_RADIOTAP_VENDOR_NAMESPACE) {  in ieee80211_radiotap_iterator_next()
307 			if ((unsigned long)iterator->_arg + size -  in ieee80211_radiotap_iterator_next()
308 			    (unsigned long)iterator->_rtheader >  in ieee80211_radiotap_iterator_next()
309 			    (unsigned long)iterator->_max_length)  in ieee80211_radiotap_iterator_next()
310 				return -EINVAL;  in ieee80211_radiotap_iterator_next()
312 			oui = (*iterator->_arg << 16) |  in ieee80211_radiotap_iterator_next()
313 				(*(iterator->_arg + 1) << 8) |  in ieee80211_radiotap_iterator_next()
314 				*(iterator->_arg + 2);  in ieee80211_radiotap_iterator_next()
315 			subns = *(iterator->_arg + 3);  in ieee80211_radiotap_iterator_next()
319 			vnslen = get_unaligned_le16(iterator->_arg + 4);  in ieee80211_radiotap_iterator_next()
320 			iterator->_next_ns_data = iterator->_arg + size + vnslen;  in ieee80211_radiotap_iterator_next()
321 			if (!iterator->current_namespace)  in ieee80211_radiotap_iterator_next()
322 				size += vnslen;  in ieee80211_radiotap_iterator_next()
329 		iterator->this_arg_index = iterator->_arg_index;  in ieee80211_radiotap_iterator_next()
330 		iterator->this_arg = iterator->_arg;  in ieee80211_radiotap_iterator_next()
331 		iterator->this_arg_size = size;  in ieee80211_radiotap_iterator_next()
333 		/* internally move on the size of this arg */  in ieee80211_radiotap_iterator_next()
334 		iterator->_arg += size;  in ieee80211_radiotap_iterator_next()
343 		if ((unsigned long)iterator->_arg -  in ieee80211_radiotap_iterator_next()
344 		    (unsigned long)iterator->_rtheader >  in ieee80211_radiotap_iterator_next()
345 		    (unsigned long)iterator->_max_length)  in ieee80211_radiotap_iterator_next()
346 			return -EINVAL;  in ieee80211_radiotap_iterator_next()
349 		switch (iterator->_arg_index % 32) {  in ieee80211_radiotap_iterator_next()
351 			iterator->_reset_on_ext = 1;  in ieee80211_radiotap_iterator_next()
353 			iterator->is_radiotap_ns = 0;  in ieee80211_radiotap_iterator_next()
360 			iterator->this_arg_index =  in ieee80211_radiotap_iterator_next()
362 			if (!iterator->current_namespace)  in ieee80211_radiotap_iterator_next()
366 			iterator->_reset_on_ext = 1;  in ieee80211_radiotap_iterator_next()
367 			iterator->current_namespace = &radiotap_ns;  in ieee80211_radiotap_iterator_next()
368 			iterator->is_radiotap_ns = 1;  in ieee80211_radiotap_iterator_next()
373 			 * -- move to next u32 bitmap  in ieee80211_radiotap_iterator_next()
375 			iterator->_bitmap_shifter =  in ieee80211_radiotap_iterator_next()
376 				get_unaligned_le32(iterator->_next_bitmap);  in ieee80211_radiotap_iterator_next()
377 			iterator->_next_bitmap++;  in ieee80211_radiotap_iterator_next()
378 			if (iterator->_reset_on_ext)  in ieee80211_radiotap_iterator_next()
379 				iterator->_arg_index = 0;  in ieee80211_radiotap_iterator_next()
381 				iterator->_arg_index++;  in ieee80211_radiotap_iterator_next()
382 			iterator->_reset_on_ext = 0;  in ieee80211_radiotap_iterator_next()
388 			iterator->_bitmap_shifter >>= 1;  in ieee80211_radiotap_iterator_next()
389 			iterator->_arg_index++;  in ieee80211_radiotap_iterator_next()