Lines Matching refs:iterator
53 * ieee80211_radiotap_iterator_init - radiotap parser iterator initialization
54 * @iterator: radiotap_iterator to initialize
60 * This function initializes an opaque iterator struct which can then
66 * call __ieee80211_radiotap_iterator_init() to init a semi-opaque iterator
71 * The iterator's @this_arg member points to the start of the argument
73 * found in the iterator's @this_arg_index member. This arg index corresponds
78 * iterator->max_length after executing ieee80211_radiotap_iterator_init()
82 * You must take care when dereferencing iterator.this_arg
84 * get_unaligned((type *)iterator.this_arg) to dereference
85 * iterator.this_arg for type "type" safely on all arches.
91 struct ieee80211_radiotap_iterator *iterator,
107 iterator->_rtheader = radiotap_header;
108 iterator->_max_length = get_unaligned_le16(&radiotap_header->it_len);
109 iterator->_arg_index = 0;
110 iterator->_bitmap_shifter = get_unaligned_le32(&radiotap_header->it_present);
111 iterator->_arg = (uint8_t *)radiotap_header + sizeof(*radiotap_header);
112 iterator->_reset_on_ext = 0;
113 iterator->_next_bitmap = &radiotap_header->it_present;
114 iterator->_next_bitmap++;
115 iterator->_vns = vns;
116 iterator->current_namespace = &radiotap_ns;
117 iterator->is_radiotap_ns = 1;
119 iterator->n_overrides = 0;
120 iterator->overrides = NULL;
125 if (iterator->_bitmap_shifter & (1<<IEEE80211_RADIOTAP_EXT)) {
126 if ((unsigned long)iterator->_arg -
127 (unsigned long)iterator->_rtheader + sizeof(uint32_t) >
128 (unsigned long)iterator->_max_length)
130 while (get_unaligned_le32(iterator->_arg) &
132 iterator->_arg += sizeof(uint32_t);
140 if ((unsigned long)iterator->_arg -
141 (unsigned long)iterator->_rtheader +
143 (unsigned long)iterator->_max_length)
147 iterator->_arg += sizeof(uint32_t);
156 iterator->this_arg = iterator->_arg;
163 static void find_ns(struct ieee80211_radiotap_iterator *iterator,
168 iterator->current_namespace = NULL;
170 if (!iterator->_vns)
173 for (i = 0; i < iterator->_vns->n_ns; i++) {
174 if (iterator->_vns->ns[i].oui != oui)
176 if (iterator->_vns->ns[i].subns != subns)
179 iterator->current_namespace = &iterator->_vns->ns[i];
185 static int find_override(struct ieee80211_radiotap_iterator *iterator,
190 if (!iterator->overrides)
193 for (i = 0; i < iterator->n_overrides; i++) {
194 if (iterator->_arg_index == iterator->overrides[i].field) {
195 *align = iterator->overrides[i].align;
196 *size = iterator->overrides[i].size;
209 * ieee80211_radiotap_iterator_next - return next radiotap parser iterator arg
210 * @iterator: radiotap_iterator to move to next arg (if any)
225 * You must take care when dereferencing iterator.this_arg
227 * get_unaligned((type *)iterator.this_arg) to dereference
228 * iterator.this_arg for type "type" safely on all arches.
232 struct ieee80211_radiotap_iterator *iterator)
240 if ((iterator->_arg_index % 32) == IEEE80211_RADIOTAP_EXT &&
241 !(iterator->_bitmap_shifter & 1))
244 if (!(iterator->_bitmap_shifter & 1))
248 switch (iterator->_arg_index % 32) {
260 if (find_override(iterator, &align, &size)) {
264 if (!iterator->current_namespace ||
265 iterator->_arg_index >= iterator->current_namespace->n_bits) {
266 if (iterator->current_namespace == &radiotap_ns)
270 align = iterator->current_namespace->align_size[iterator->_arg_index].align;
271 size = iterator->current_namespace->align_size[iterator->_arg_index].size;
275 iterator->_arg = iterator->_next_ns_data;
277 iterator->current_namespace = NULL;
295 pad = ((unsigned long)iterator->_arg -
296 (unsigned long)iterator->_rtheader) & (align - 1);
299 iterator->_arg += align - pad;
301 if (iterator->_arg_index % 32 == IEEE80211_RADIOTAP_VENDOR_NAMESPACE) {
304 if ((unsigned long)iterator->_arg + size -
305 (unsigned long)iterator->_rtheader >
306 (unsigned long)iterator->_max_length)
309 oui = (*iterator->_arg << 16) |
310 (*(iterator->_arg + 1) << 8) |
311 *(iterator->_arg + 2);
312 subns = *(iterator->_arg + 3);
314 find_ns(iterator, oui, subns);
316 vnslen = get_unaligned_le16(iterator->_arg + 4);
317 iterator->_next_ns_data = iterator->_arg + size + vnslen;
318 if (!iterator->current_namespace)
326 iterator->this_arg_index = iterator->_arg_index;
327 iterator->this_arg = iterator->_arg;
328 iterator->this_arg_size = size;
331 iterator->_arg += size;
340 if ((unsigned long)iterator->_arg -
341 (unsigned long)iterator->_rtheader >
342 (unsigned long)iterator->_max_length)
346 switch (iterator->_arg_index % 32) {
348 iterator->_reset_on_ext = 1;
350 iterator->is_radiotap_ns = 0;
357 iterator->this_arg_index =
359 if (!iterator->current_namespace)
363 iterator->_reset_on_ext = 1;
364 iterator->current_namespace = &radiotap_ns;
365 iterator->is_radiotap_ns = 1;
372 iterator->_bitmap_shifter =
373 get_unaligned_le32(iterator->_next_bitmap);
374 iterator->_next_bitmap++;
375 if (iterator->_reset_on_ext)
376 iterator->_arg_index = 0;
378 iterator->_arg_index++;
379 iterator->_reset_on_ext = 0;
385 iterator->_bitmap_shifter >>= 1;
386 iterator->_arg_index++;