Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 371 insertions, 0 deletions

diff --git a/net/wireless/radiotap.c b/net/wireless/radiotap.c
new file mode 100644
index 000000000..36f1b59a7
--- /dev/null
+++ b/net/wireless/radiotap.c
@@ -0,0 +1,371 @@
+/*
+ * 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 <linux/kernel.h>
+#include <linux/export.h>
+#include <net/cfg80211.h>
+#include <net/ieee80211_radiotap.h>
+#include <asm/unaligned.h>
+
+/* 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, },
+        [IEEE80211_RADIOTAP_MCS] = { .align = 1, .size = 3, },
+        [IEEE80211_RADIOTAP_AMPDU_STATUS] = { .align = 4, .size = 8, },
+        [IEEE80211_RADIOTAP_VHT] = { .align = 2, .size = 12, },
+        /*
+         * add more here as they are defined in radiotap.h
+         */
+};
+
+static const struct ieee80211_radiotap_namespace radiotap_ns = {
+        .n_bits = ARRAY_SIZE(rtap_namespace_sizes),
+        .align_size = rtap_namespace_sizes,
+};
+
+/**
+ * ieee80211_radiotap_iterator_init - radiotap parser iterator initialization
+ * @iterator: radiotap_iterator to initialize
+ * @radiotap_header: radiotap header to parse
+ * @max_length: total length we can parse into (eg, whole packet length)
+ * @vns: vendor namespaces to parse
+ *
+ * Returns: 0 or a negative error code if there is a problem.
+ *
+ * This function initializes an opaque iterator struct which can then
+ * be passed to ieee80211_radiotap_iterator_next() to visit every radiotap
+ * argument which is present in the header.  It knows about extended
+ * present headers and handles them.
+ *
+ * How to use:
+ * call __ieee80211_radiotap_iterator_init() to init a semi-opaque iterator
+ * struct ieee80211_radiotap_iterator (no need to init the struct beforehand)
+ * checking for a good 0 return code.  Then loop calling
+ * __ieee80211_radiotap_iterator_next()... it returns either 0,
+ * -ENOENT if there are no more args to parse, or -EINVAL if there is a problem.
+ * The iterator's @this_arg member points to the start of the argument
+ * associated with the current argument index that is present, which can be
+ * found in the iterator's @this_arg_index member.  This arg index corresponds
+ * to the IEEE80211_RADIOTAP_... defines.
+ *
+ * Radiotap header length:
+ * You can find the CPU-endian total radiotap header length in
+ * iterator->max_length after executing ieee80211_radiotap_iterator_init()
+ * successfully.
+ *
+ * Alignment Gotcha:
+ * You must take care when dereferencing iterator.this_arg
+ * for multibyte types... the pointer is not aligned.  Use
+ * get_unaligned((type *)iterator.this_arg) to dereference
+ * iterator.this_arg for type "type" safely on all arches.
+ *
+ * Example code:
+ * See Documentation/networking/radiotap-headers.rst
+ */
+
+int ieee80211_radiotap_iterator_init(
+        struct ieee80211_radiotap_iterator *iterator,
+        struct ieee80211_radiotap_header *radiotap_header,
+        int max_length, const struct ieee80211_radiotap_vendor_namespaces *vns)
+{
+        /* check the radiotap header can actually be present */
+        if (max_length < sizeof(struct ieee80211_radiotap_header))
+                return -EINVAL;
+
+        /* Linux only supports version 0 radiotap format */
+        if (radiotap_header->it_version)
+                return -EINVAL;
+
+        /* sanity check for allowed length and radiotap length field */
+        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 = (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 (iterator->_bitmap_shifter & (1<<IEEE80211_RADIOTAP_EXT)) {
+                if ((unsigned long)iterator->_arg -
+                    (unsigned long)iterator->_rtheader + sizeof(uint32_t) >
+                    (unsigned long)iterator->_max_length)
+                        return -EINVAL;
+                while (get_unaligned_le32(iterator->_arg) &
+                                        (1 << IEEE80211_RADIOTAP_EXT)) {
+                        iterator->_arg += sizeof(uint32_t);
+
+                        /*
+                         * check for insanity where the present bitmaps
+                         * keep claiming to extend up to or even beyond the
+                         * stated radiotap header length
+                         */
+
+                        if ((unsigned long)iterator->_arg -
+                            (unsigned long)iterator->_rtheader +
+                            sizeof(uint32_t) >
+                            (unsigned long)iterator->_max_length)
+                                return -EINVAL;
+                }
+
+                iterator->_arg += sizeof(uint32_t);
+
+                /*
+                 * no need to check again for blowing past stated radiotap
+                 * header length, because ieee80211_radiotap_iterator_next
+                 * checks it before it is dereferenced
+                 */
+        }
+
+        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
+ * @iterator: radiotap_iterator to move to next arg (if any)
+ *
+ * Returns: 0 if there is an argument to handle,
+ * -ENOENT if there are no more args or -EINVAL
+ * if there is something else wrong.
+ *
+ * This function provides the next radiotap arg index (IEEE80211_RADIOTAP_*)
+ * in @this_arg_index and sets @this_arg to point to the
+ * payload for the field.  It takes care of alignment handling and extended
+ * present fields.  @this_arg can be changed by the caller (eg,
+ * incremented to move inside a compound argument like
+ * IEEE80211_RADIOTAP_CHANNEL).  The args pointed to are in
+ * little-endian format whatever the endianess of your CPU.
+ *
+ * Alignment Gotcha:
+ * You must take care when dereferencing iterator.this_arg
+ * for multibyte types... the pointer is not aligned.  Use
+ * get_unaligned((type *)iterator.this_arg) to dereference
+ * iterator.this_arg for type "type" safely on all arches.
+ */
+
+int ieee80211_radiotap_iterator_next(
+        struct ieee80211_radiotap_iterator *iterator)
+{
+        while (1) {
+                int hit = 0;
+                int pad, align, size, subns;
+                uint32_t oui;
+
+                /* 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
+                 *
+                 * 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.
+                 */
+
+                pad = ((unsigned long)iterator->_arg -
+                       (unsigned long)iterator->_rtheader) & (align - 1);
+
+                if (pad)
+                        iterator->_arg += align - pad;
+
+                if (iterator->_arg_index % 32 == IEEE80211_RADIOTAP_VENDOR_NAMESPACE) {
+                        int vnslen;
+
+                        if ((unsigned long)iterator->_arg + size -
+                            (unsigned long)iterator->_rtheader >
+                            (unsigned long)iterator->_max_length)
+                                return -EINVAL;
+
+                        oui = (*iterator->_arg << 16) |
+                                (*(iterator->_arg + 1) << 8) |
+                                *(iterator->_arg + 2);
+                        subns = *(iterator->_arg + 3);
+
+                        find_ns(iterator, oui, subns);
+
+                        vnslen = get_unaligned_le16(iterator->_arg + 4);
+                        iterator->_next_ns_data = iterator->_arg + size + vnslen;
+                        if (!iterator->current_namespace)
+                                size += vnslen;
+                }
+
+                /*
+                 * 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;
+                iterator->this_arg_size = size;
+
+                /* internally move on the size of this arg */
+                iterator->_arg += size;
+
+                /*
+                 * 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 ((unsigned long)iterator->_arg -
+                    (unsigned long)iterator->_rtheader >
+                    (unsigned long)iterator->_max_length)
+                        return -EINVAL;
+
+                /* these special ones are valid in each bitmap word */
+                switch (iterator->_arg_index % 32) {
+                case IEEE80211_RADIOTAP_VENDOR_NAMESPACE:
+                        iterator->_reset_on_ext = 1;
+
+                        iterator->is_radiotap_ns = 0;
+                        /*
+                         * If parser didn't register this vendor
+                         * namespace with us, allow it to show it
+                         * as 'raw. Do do that, set argument index
+                         * to vendor namespace.
+                         */
+                        iterator->this_arg_index =
+                                IEEE80211_RADIOTAP_VENDOR_NAMESPACE;
+                        if (!iterator->current_namespace)
+                                hit = 1;
+                        goto next_entry;
+                case IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE:
+                        iterator->_reset_on_ext = 1;
+                        iterator->current_namespace = &radiotap_ns;
+                        iterator->is_radiotap_ns = 1;
+                        goto next_entry;
+                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;
+        }
+}
+EXPORT_SYMBOL(ieee80211_radiotap_iterator_next);