*/
-int ieee80211_radiotap_iterator_init(
- struct ieee80211_radiotap_iterator * iterator,
- struct ieee80211_radiotap_header * radiotap_header,
- int max_length)
+int
+ieee80211_radiotap_iterator_init (struct ieee80211_radiotap_iterator *iterator,
+ struct ieee80211_radiotap_header
+ *radiotap_header, int max_length)
{
- if(iterator == NULL)
- return (-EINVAL);
+ if (iterator == NULL)
+ return (-EINVAL);
- if(radiotap_header == NULL)
- return (-EINVAL);
- /* Linux only supports version 0 radiotap format */
+ if (radiotap_header == NULL)
+ return (-EINVAL);
+ /* Linux only supports version 0 radiotap format */
- if (radiotap_header->it_version)
- return (-EINVAL);
+ if (radiotap_header->it_version)
+ return (-EINVAL);
- /* sanity check for allowed length and radiotap length field */
+ /* sanity check for allowed length and radiotap length field */
- if (max_length < (le16_to_cpu(radiotap_header->it_len)))
- return (-EINVAL);
+ if (max_length < (le16_to_cpu (radiotap_header->it_len)))
+ return (-EINVAL);
- iterator->rtheader = radiotap_header;
- iterator->max_length = le16_to_cpu(radiotap_header->it_len);
- iterator->arg_index = 0;
- iterator->bitmap_shifter = le32_to_cpu(radiotap_header->it_present);
- iterator->arg = ((u8 *)radiotap_header) +
- sizeof (struct ieee80211_radiotap_header);
- iterator->this_arg = 0;
+ iterator->rtheader = radiotap_header;
+ iterator->max_length = le16_to_cpu (radiotap_header->it_len);
+ iterator->arg_index = 0;
+ iterator->bitmap_shifter = le32_to_cpu (radiotap_header->it_present);
+ iterator->arg =
+ ((u8 *) radiotap_header) + sizeof (struct ieee80211_radiotap_header);
+ iterator->this_arg = 0;
- /* find payload start allowing for extended bitmap(s) */
+ /* find payload start allowing for extended bitmap(s) */
- if (unlikely(iterator->bitmap_shifter &
- IEEE80211_RADIOTAP_PRESENT_EXTEND_MASK)) {
- while (le32_to_cpu(*((u32 *)iterator->arg)) &
- IEEE80211_RADIOTAP_PRESENT_EXTEND_MASK) {
- iterator->arg += sizeof (u32);
+ if (unlikely
+ (iterator->bitmap_shifter & IEEE80211_RADIOTAP_PRESENT_EXTEND_MASK))
+ {
+ while (le32_to_cpu (*((u32 *) iterator->arg)) &
+ IEEE80211_RADIOTAP_PRESENT_EXTEND_MASK)
+ {
+ iterator->arg += sizeof (u32);
- /*
- * check for insanity where the present bitmaps
- * keep claiming to extend up to or even beyond the
- * stated radiotap header length
- */
+ /*
+ * check for insanity where the present bitmaps
+ * keep claiming to extend up to or even beyond the
+ * stated radiotap header length
+ */
- if ((((void*)iterator->arg) - ((void*)iterator->rtheader)) >
- iterator->max_length)
- return (-EINVAL);
+ if ((((void *) iterator->arg) - ((void *) iterator->rtheader)) >
+ iterator->max_length)
+ return (-EINVAL);
- }
+ }
- iterator->arg += sizeof (u32);
+ iterator->arg += sizeof (u32);
- /*
- * no need to check again for blowing past stated radiotap
- * header length, becuase ieee80211_radiotap_iterator_next
- * checks it before it is dereferenced
- */
+ /*
+ * no need to check again for blowing past stated radiotap
+ * header length, becuase ieee80211_radiotap_iterator_next
+ * checks it before it is dereferenced
+ */
- }
+ }
- /* we are all initialized happily */
+ /* we are all initialized happily */
- return (0);
+ return (0);
}
* format.
*/
-int ieee80211_radiotap_iterator_next(
- struct ieee80211_radiotap_iterator * iterator)
+int
+ieee80211_radiotap_iterator_next (struct ieee80211_radiotap_iterator *iterator)
{
- /*
- * small length lookup table for all radiotap types we heard of
- * starting from b0 in the bitmap, so we can walk the payload
- * area of the radiotap header
- *
- * There is a requirement to pad args, so that args
- * of a given length must begin at a boundary of that length
- * -- but note that compound args are allowed (eg, 2 x u16
- * for IEEE80211_RADIOTAP_CHANNEL) so total arg length is not
- * a reliable indicator of alignment requirement.
- *
- * upper nybble: content alignment for arg
- * lower nybble: content length for arg
- */
-
- static const u8 rt_sizes[] = {
- [IEEE80211_RADIOTAP_TSFT] = 0x88,
- [IEEE80211_RADIOTAP_FLAGS] = 0x11,
- [IEEE80211_RADIOTAP_RATE] = 0x11,
- [IEEE80211_RADIOTAP_CHANNEL] = 0x24,
- [IEEE80211_RADIOTAP_FHSS] = 0x22,
- [IEEE80211_RADIOTAP_DBM_ANTSIGNAL] = 0x11,
- [IEEE80211_RADIOTAP_DBM_ANTNOISE] = 0x11,
- [IEEE80211_RADIOTAP_LOCK_QUALITY] = 0x22,
- [IEEE80211_RADIOTAP_TX_ATTENUATION] = 0x22,
- [IEEE80211_RADIOTAP_DB_TX_ATTENUATION] = 0x22,
- [IEEE80211_RADIOTAP_DBM_TX_POWER] = 0x11,
- [IEEE80211_RADIOTAP_ANTENNA] = 0x11,
- [IEEE80211_RADIOTAP_DB_ANTSIGNAL] = 0x11,
- [IEEE80211_RADIOTAP_DB_ANTNOISE] = 0x11,
- [IEEE80211_RADIOTAP_TX_FLAGS] = 0x22,
- [IEEE80211_RADIOTAP_RX_FLAGS] = 0x22,
- [IEEE80211_RADIOTAP_RTS_RETRIES] = 0x11,
- [IEEE80211_RADIOTAP_DATA_RETRIES] = 0x11
- /*
- * add more here as they are defined in
- * include/net/ieee80211_radiotap.h
- */
- };
-
- /*
- * for every radiotap entry we can at
- * least skip (by knowing the length)...
- */
-
- while (iterator->arg_index < (int)sizeof (rt_sizes)) {
- int hit = 0;
-
- if (!(iterator->bitmap_shifter & 1))
- goto next_entry; /* arg not present */
-
- /*
- * arg is present, account for alignment padding
- * 8-bit args can be at any alignment
- * 16-bit args must start on 16-bit boundary
- * 32-bit args must start on 32-bit boundary
- * 64-bit args must start on 64-bit boundary
- *
- * note that total arg size can differ from alignment of
- * elements inside arg, so we use upper nybble of length
- * table to base alignment on
- *
- * also note: these alignments are ** relative to the
- * start of the radiotap header **. There is no guarantee
- * that the radiotap header itself is aligned on any
- * kind of boundary.
- */
-
- if ((((void*)iterator->arg)-((void*)iterator->rtheader)) &
- ((rt_sizes[iterator->arg_index] >> 4) - 1))
- iterator->arg_index +=
- (rt_sizes[iterator->arg_index] >> 4) -
- ((((void*)iterator->arg) -
- ((void*)iterator->rtheader)) &
- ((rt_sizes[iterator->arg_index] >> 4) - 1));
-
- /*
- * this is what we will return to user, but we need to
- * move on first so next call has something fresh to test
- */
-
- iterator->this_arg_index = iterator->arg_index;
- iterator->this_arg = iterator->arg;
- hit = 1;
-
- /* internally move on the size of this arg */
-
- iterator->arg += rt_sizes[iterator->arg_index] & 0x0f;
-
- /*
- * check for insanity where we are given a bitmap that
- * claims to have more arg content than the length of the
- * radiotap section. We will normally end up equalling this
- * max_length on the last arg, never exceeding it.
- */
-
- if ((((void*)iterator->arg) - ((void*)iterator->rtheader)) >
- iterator->max_length)
- return (-EINVAL);
-
- next_entry:
-
- iterator->arg_index++;
- if (unlikely((iterator->arg_index & 31) == 0)) {
- /* completed current u32 bitmap */
- if (iterator->bitmap_shifter & 1) {
- /* b31 was set, there is more */
- /* move to next u32 bitmap */
- iterator->bitmap_shifter = le32_to_cpu(
- *iterator->next_bitmap);
- iterator->next_bitmap++;
- } else {
- /* no more bitmaps: end */
- iterator->arg_index = sizeof (rt_sizes);
- }
- } else { /* just try the next bit */
- iterator->bitmap_shifter >>= 1;
- }
-
- /* if we found a valid arg earlier, return it now */
-
- if (hit)
- return (iterator->this_arg_index);
-
- }
-
- /* we don't know how to handle any more args, we're done */
-
- return (-1);
+ /*
+ * small length lookup table for all radiotap types we heard of
+ * starting from b0 in the bitmap, so we can walk the payload
+ * area of the radiotap header
+ *
+ * There is a requirement to pad args, so that args
+ * of a given length must begin at a boundary of that length
+ * -- but note that compound args are allowed (eg, 2 x u16
+ * for IEEE80211_RADIOTAP_CHANNEL) so total arg length is not
+ * a reliable indicator of alignment requirement.
+ *
+ * upper nybble: content alignment for arg
+ * lower nybble: content length for arg
+ */
+
+ static const u8 rt_sizes[] = {
+ [IEEE80211_RADIOTAP_TSFT] = 0x88,
+ [IEEE80211_RADIOTAP_FLAGS] = 0x11,
+ [IEEE80211_RADIOTAP_RATE] = 0x11,
+ [IEEE80211_RADIOTAP_CHANNEL] = 0x24,
+ [IEEE80211_RADIOTAP_FHSS] = 0x22,
+ [IEEE80211_RADIOTAP_DBM_ANTSIGNAL] = 0x11,
+ [IEEE80211_RADIOTAP_DBM_ANTNOISE] = 0x11,
+ [IEEE80211_RADIOTAP_LOCK_QUALITY] = 0x22,
+ [IEEE80211_RADIOTAP_TX_ATTENUATION] = 0x22,
+ [IEEE80211_RADIOTAP_DB_TX_ATTENUATION] = 0x22,
+ [IEEE80211_RADIOTAP_DBM_TX_POWER] = 0x11,
+ [IEEE80211_RADIOTAP_ANTENNA] = 0x11,
+ [IEEE80211_RADIOTAP_DB_ANTSIGNAL] = 0x11,
+ [IEEE80211_RADIOTAP_DB_ANTNOISE] = 0x11,
+ [IEEE80211_RADIOTAP_TX_FLAGS] = 0x22,
+ [IEEE80211_RADIOTAP_RX_FLAGS] = 0x22,
+ [IEEE80211_RADIOTAP_RTS_RETRIES] = 0x11,
+ [IEEE80211_RADIOTAP_DATA_RETRIES] = 0x11
+ /*
+ * add more here as they are defined in
+ * include/net/ieee80211_radiotap.h
+ */
+ };
+
+ /*
+ * for every radiotap entry we can at
+ * least skip (by knowing the length)...
+ */
+
+ while (iterator->arg_index < (int) sizeof (rt_sizes))
+ {
+ int hit = 0;
+
+ if (!(iterator->bitmap_shifter & 1))
+ goto next_entry; /* arg not present */
+
+ /*
+ * arg is present, account for alignment padding
+ * 8-bit args can be at any alignment
+ * 16-bit args must start on 16-bit boundary
+ * 32-bit args must start on 32-bit boundary
+ * 64-bit args must start on 64-bit boundary
+ *
+ * note that total arg size can differ from alignment of
+ * elements inside arg, so we use upper nybble of length
+ * table to base alignment on
+ *
+ * also note: these alignments are ** relative to the
+ * start of the radiotap header **. There is no guarantee
+ * that the radiotap header itself is aligned on any
+ * kind of boundary.
+ */
+
+ if ((((void *) iterator->arg) -
+ ((void *) iterator->rtheader)) & ((rt_sizes[iterator->arg_index] >> 4)
+ - 1))
+ iterator->arg_index +=
+ (rt_sizes[iterator->arg_index] >> 4) -
+ ((((void *) iterator->arg) -
+ ((void *) iterator->rtheader)) & ((rt_sizes[iterator->arg_index] >>
+ 4) - 1));
+
+ /*
+ * this is what we will return to user, but we need to
+ * move on first so next call has something fresh to test
+ */
+
+ iterator->this_arg_index = iterator->arg_index;
+ iterator->this_arg = iterator->arg;
+ hit = 1;
+
+ /* internally move on the size of this arg */
+
+ iterator->arg += rt_sizes[iterator->arg_index] & 0x0f;
+
+ /*
+ * check for insanity where we are given a bitmap that
+ * claims to have more arg content than the length of the
+ * radiotap section. We will normally end up equalling this
+ * max_length on the last arg, never exceeding it.
+ */
+
+ if ((((void *) iterator->arg) - ((void *) iterator->rtheader)) >
+ iterator->max_length)
+ return (-EINVAL);
+
+next_entry:
+
+ iterator->arg_index++;
+ if (unlikely ((iterator->arg_index & 31) == 0))
+ {
+ /* completed current u32 bitmap */
+ if (iterator->bitmap_shifter & 1)
+ {
+ /* b31 was set, there is more */
+ /* move to next u32 bitmap */
+ iterator->bitmap_shifter = le32_to_cpu (*iterator->next_bitmap);
+ iterator->next_bitmap++;
+ }
+ else
+ {
+ /* no more bitmaps: end */
+ iterator->arg_index = sizeof (rt_sizes);
+ }
+ }
+ else
+ { /* just try the next bit */
+ iterator->bitmap_shifter >>= 1;
+ }
+
+ /* if we found a valid arg earlier, return it now */
+
+ if (hit)
+ return (iterator->this_arg_index);
+
+ }
+
+ /* we don't know how to handle any more args, we're done */
+
+ return (-1);
}
projects / oweals / gnunet.git / blobdiff