wireless: update radiotap parser

Upstream radiotap has adopted the namespace
proposal David Young made and I then took care
of, for which I had adapted the radiotap parser
as a library outside the kernel. This brings
the in-kernel parser up to speed.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 198 insertions, 107 deletions

diff --git a/net/wireless/radiotap.c b/net/wireless/radiotap.c
index f591871..1332c44 100644
--- a/net/wireless/radiotap.c
+++ b/net/wireless/radiotap.c
@@ -2,6 +2,16 @@
  * Radiotap parser
  *
  * Copyright 2007		Andy Green <andy@warmcat.com>
+ * Copyright 2009		Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See COPYING for more details.
  */
 
 #include <net/cfg80211.h>
@@ -10,6 +20,35 @@
 
 /* function prototypes and related defs are in include/net/cfg80211.h */
 
+static const struct radiotap_align_size rtap_namespace_sizes[] = {
+	[IEEE80211_RADIOTAP_TSFT] = { .align = 8, .size = 8, },
+	[IEEE80211_RADIOTAP_FLAGS] = { .align = 1, .size = 1, },
+	[IEEE80211_RADIOTAP_RATE] = { .align = 1, .size = 1, },
+	[IEEE80211_RADIOTAP_CHANNEL] = { .align = 2, .size = 4, },
+	[IEEE80211_RADIOTAP_FHSS] = { .align = 2, .size = 2, },
+	[IEEE80211_RADIOTAP_DBM_ANTSIGNAL] = { .align = 1, .size = 1, },
+	[IEEE80211_RADIOTAP_DBM_ANTNOISE] = { .align = 1, .size = 1, },
+	[IEEE80211_RADIOTAP_LOCK_QUALITY] = { .align = 2, .size = 2, },
+	[IEEE80211_RADIOTAP_TX_ATTENUATION] = { .align = 2, .size = 2, },
+	[IEEE80211_RADIOTAP_DB_TX_ATTENUATION] = { .align = 2, .size = 2, },
+	[IEEE80211_RADIOTAP_DBM_TX_POWER] = { .align = 1, .size = 1, },
+	[IEEE80211_RADIOTAP_ANTENNA] = { .align = 1, .size = 1, },
+	[IEEE80211_RADIOTAP_DB_ANTSIGNAL] = { .align = 1, .size = 1, },
+	[IEEE80211_RADIOTAP_DB_ANTNOISE] = { .align = 1, .size = 1, },
+	[IEEE80211_RADIOTAP_RX_FLAGS] = { .align = 2, .size = 2, },
+	[IEEE80211_RADIOTAP_TX_FLAGS] = { .align = 2, .size = 2, },
+	[IEEE80211_RADIOTAP_RTS_RETRIES] = { .align = 1, .size = 1, },
+	[IEEE80211_RADIOTAP_DATA_RETRIES] = { .align = 1, .size = 1, },
+	/*
+	 * add more here as they are defined in radiotap.h
+	 */
+};
+
+static const struct ieee80211_radiotap_namespace radiotap_ns = {
+	.n_bits = sizeof(rtap_namespace_sizes) / sizeof(rtap_namespace_sizes[0]),
+	.align_size = rtap_namespace_sizes,
+};
+
 /**
  * ieee80211_radiotap_iterator_init - radiotap parser iterator initialization
  * @iterator: radiotap_iterator to initialize
@@ -50,9 +89,9 @@
  */
 
 int ieee80211_radiotap_iterator_init(
-    struct ieee80211_radiotap_iterator *iterator,
-    struct ieee80211_radiotap_header *radiotap_header,
-    int max_length)
+	struct ieee80211_radiotap_iterator *iterator,
+	struct ieee80211_radiotap_header *radiotap_header,
+	int max_length, const struct ieee80211_radiotap_vendor_namespaces *vns)
 {
 	/* Linux only supports version 0 radiotap format */
 	if (radiotap_header->it_version)
@@ -62,19 +101,24 @@ int ieee80211_radiotap_iterator_init(
 	if (max_length < get_unaligned_le16(&radiotap_header->it_len))
 		return -EINVAL;
 
-	iterator->rtheader = radiotap_header;
-	iterator->max_length = get_unaligned_le16(&radiotap_header->it_len);
-	iterator->arg_index = 0;
-	iterator->bitmap_shifter = get_unaligned_le32(&radiotap_header->it_present);
-	iterator->arg = (u8 *)radiotap_header + sizeof(*radiotap_header);
-	iterator->this_arg = NULL;
+	iterator->_rtheader = radiotap_header;
+	iterator->_max_length = get_unaligned_le16(&radiotap_header->it_len);
+	iterator->_arg_index = 0;
+	iterator->_bitmap_shifter = get_unaligned_le32(&radiotap_header->it_present);
+	iterator->_arg = (uint8_t *)radiotap_header + sizeof(*radiotap_header);
+	iterator->_reset_on_ext = 0;
+	iterator->_next_bitmap = &radiotap_header->it_present;
+	iterator->_next_bitmap++;
+	iterator->_vns = vns;
+	iterator->current_namespace = &radiotap_ns;
+	iterator->is_radiotap_ns = 1;
 
 	/* find payload start allowing for extended bitmap(s) */
 
-	if (unlikely(iterator->bitmap_shifter & (1<<IEEE80211_RADIOTAP_EXT))) {
-		while (get_unaligned_le32(iterator->arg) &
-		       (1 << IEEE80211_RADIOTAP_EXT)) {
-			iterator->arg += sizeof(u32);
+	if (iterator->_bitmap_shifter & (1<<IEEE80211_RADIOTAP_EXT)) {
+		while (get_unaligned_le32(iterator->_arg) &
+					(1 << IEEE80211_RADIOTAP_EXT)) {
+			iterator->_arg += sizeof(uint32_t);
 
 			/*
 			 * check for insanity where the present bitmaps
@@ -82,12 +126,13 @@ int ieee80211_radiotap_iterator_init(
 			 * stated radiotap header length
 			 */
 
-			if (((ulong)iterator->arg -
-			     (ulong)iterator->rtheader) > iterator->max_length)
+			if ((unsigned long)iterator->_arg -
+			    (unsigned long)iterator->_rtheader >
+			    (unsigned long)iterator->_max_length)
 				return -EINVAL;
 		}
 
-		iterator->arg += sizeof(u32);
+		iterator->_arg += sizeof(uint32_t);
 
 		/*
 		 * no need to check again for blowing past stated radiotap
@@ -96,12 +141,36 @@ int ieee80211_radiotap_iterator_init(
 		 */
 	}
 
+	iterator->this_arg = iterator->_arg;
+
 	/* we are all initialized happily */
 
 	return 0;
 }
 EXPORT_SYMBOL(ieee80211_radiotap_iterator_init);
 
+static void find_ns(struct ieee80211_radiotap_iterator *iterator,
+		    uint32_t oui, uint8_t subns)
+{
+	int i;
+
+	iterator->current_namespace = NULL;
+
+	if (!iterator->_vns)
+		return;
+
+	for (i = 0; i < iterator->_vns->n_ns; i++) {
+		if (iterator->_vns->ns[i].oui != oui)
+			continue;
+		if (iterator->_vns->ns[i].subns != subns)
+			continue;
+
+		iterator->current_namespace = &iterator->_vns->ns[i];
+		break;
+	}
+}
+
+
 
 /**
  * ieee80211_radiotap_iterator_next - return next radiotap parser iterator arg
@@ -127,99 +196,80 @@ EXPORT_SYMBOL(ieee80211_radiotap_iterator_init);
  */
 
 int ieee80211_radiotap_iterator_next(
-    struct ieee80211_radiotap_iterator *iterator)
+	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_RX_FLAGS] = 0x22,
-		[IEEE80211_RADIOTAP_TX_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 < sizeof(rt_sizes)) {
+	while (1) {
 		int hit = 0;
-		int pad;
+		int pad, align, size, subns, vnslen;
+		uint32_t oui;
 
-		if (!(iterator->bitmap_shifter & 1))
+		/* if no more EXT bits, that's it */
+		if ((iterator->_arg_index % 32) == IEEE80211_RADIOTAP_EXT &&
+		    !(iterator->_bitmap_shifter & 1))
+			return -ENOENT;
+
+		if (!(iterator->_bitmap_shifter & 1))
 			goto next_entry; /* arg not present */
 
+		/* get alignment/size of data */
+		switch (iterator->_arg_index % 32) {
+		case IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE:
+		case IEEE80211_RADIOTAP_EXT:
+			align = 1;
+			size = 0;
+			break;
+		case IEEE80211_RADIOTAP_VENDOR_NAMESPACE:
+			align = 2;
+			size = 6;
+			break;
+		default:
+			if (!iterator->current_namespace ||
+			    iterator->_arg_index >= iterator->current_namespace->n_bits) {
+				if (iterator->current_namespace == &radiotap_ns)
+					return -ENOENT;
+				align = 0;
+			} else {
+				align = iterator->current_namespace->align_size[iterator->_arg_index].align;
+				size = iterator->current_namespace->align_size[iterator->_arg_index].size;
+			}
+			if (!align) {
+				/* skip all subsequent data */
+				iterator->_arg = iterator->_next_ns_data;
+				/* give up on this namespace */
+				iterator->current_namespace = NULL;
+				goto next_entry;
+			}
+			break;
+		}
+
 		/*
 		 * 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
+		 * Note that 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.
 		 *
-		 * the above is why get_unaligned() is used to dereference
-		 * multibyte elements from the radiotap area
+		 * The above is why get_unaligned() is used to dereference
+		 * multibyte elements from the radiotap area.
 		 */
 
-		pad = (((ulong)iterator->arg) -
-			((ulong)iterator->rtheader)) &
-			((rt_sizes[iterator->arg_index] >> 4) - 1);
+		pad = ((unsigned long)iterator->_arg -
+		       (unsigned long)iterator->_rtheader) & (align - 1);
 
 		if (pad)
-			iterator->arg +=
-				(rt_sizes[iterator->arg_index] >> 4) - pad;
+			iterator->_arg += align - pad;
 
 		/*
 		 * 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;
+		iterator->this_arg_index = iterator->_arg_index;
+		iterator->this_arg = iterator->_arg;
+		iterator->this_arg_size = size;
 
 		/* internally move on the size of this arg */
-		iterator->arg += rt_sizes[iterator->arg_index] & 0x0f;
+		iterator->_arg += size;
 
 		/*
 		 * check for insanity where we are given a bitmap that
@@ -228,32 +278,73 @@ int ieee80211_radiotap_iterator_next(
 		 * max_length on the last arg, never exceeding it.
 		 */
 
-		if (((ulong)iterator->arg - (ulong)iterator->rtheader) >
-		    iterator->max_length)
+		if ((unsigned long)iterator->_arg -
+		    (unsigned long)iterator->_rtheader >
+		    (unsigned long)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 =
-				    get_unaligned_le32(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;
+		/* these special ones are valid in each bitmap word */
+		switch (iterator->_arg_index % 32) {
+		case IEEE80211_RADIOTAP_VENDOR_NAMESPACE:
+			iterator->_bitmap_shifter >>= 1;
+			iterator->_arg_index++;
+
+			iterator->_reset_on_ext = 1;
+
+			vnslen = get_unaligned_le16(iterator->this_arg + 4);
+			iterator->_next_ns_data = iterator->_arg + vnslen;
+			oui = (*iterator->this_arg << 16) |
+				(*(iterator->this_arg + 1) << 8) |
+				*(iterator->this_arg + 2);
+			subns = *(iterator->this_arg + 3);
+
+			find_ns(iterator, oui, subns);
+
+			iterator->is_radiotap_ns = 0;
+			/* allow parsers to show this information */
+			iterator->this_arg_index =
+				IEEE80211_RADIOTAP_VENDOR_NAMESPACE;
+			iterator->this_arg_size += vnslen;
+			if ((unsigned long)iterator->this_arg +
+			    iterator->this_arg_size -
+			    (unsigned long)iterator->_rtheader >
+			    (unsigned long)(unsigned long)iterator->_max_length)
+				return -EINVAL;
+			hit = 1;
+			break;
+		case IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE:
+			iterator->_bitmap_shifter >>= 1;
+			iterator->_arg_index++;
+
+			iterator->_reset_on_ext = 1;
+			iterator->current_namespace = &radiotap_ns;
+			iterator->is_radiotap_ns = 1;
+			break;
+		case IEEE80211_RADIOTAP_EXT:
+			/*
+			 * bit 31 was set, there is more
+			 * -- move to next u32 bitmap
+			 */
+			iterator->_bitmap_shifter =
+				get_unaligned_le32(iterator->_next_bitmap);
+			iterator->_next_bitmap++;
+			if (iterator->_reset_on_ext)
+				iterator->_arg_index = 0;
+			else
+				iterator->_arg_index++;
+			iterator->_reset_on_ext = 0;
+			break;
+		default:
+			/* we've got a hit! */
+			hit = 1;
+ next_entry:
+			iterator->_bitmap_shifter >>= 1;
+			iterator->_arg_index++;
+		}
 
 		/* if we found a valid arg earlier, return it now */
 		if (hit)
 			return 0;
 	}
-
-	/* we don't know how to handle any more args, we're done */
-	return -ENOENT;
 }
 EXPORT_SYMBOL(ieee80211_radiotap_iterator_next);