X-Git-Url: https://handorf.org/code/?p=soho-sigint.git;a=blobdiff_plain;f=client-wifi%2Fdisect5%2Fradiotap.c;fp=client-wifi%2Fdisect5%2Fradiotap.c;h=0000000000000000000000000000000000000000;hp=8827a8654e620b8e3534575aa3fae85567fc3a76;hb=d9eef3618e5d1213bd3eead787dbc48ec2fa16b1;hpb=d6e95b6c679ed6041bb105b562acd36b56cb58eb diff --git a/client-wifi/disect5/radiotap.c b/client-wifi/disect5/radiotap.c deleted file mode 100644 index 8827a86..0000000 --- a/client-wifi/disect5/radiotap.c +++ /dev/null @@ -1,396 +0,0 @@ -/* - * Radiotap parser - * - * Copyright 2007 Andy Green - * Copyright 2009 Johannes Berg - * - * 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 "radiotap_iter.h" -#include "platform.h" -#if defined(ANDROID) || defined(__ANDROID__) - #include "../byteorder.h" -#endif - -/* function prototypes and related defs are in radiotap_iter.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, }, - /* - * 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 - * @radiotap_header: radiotap header to parse - * @max_length: total length we can parse into (eg, whole packet length) - * - * 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: parse.c - */ - -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) -{ - /* must at least have the radiotap header */ - if (max_length < (int)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; -#ifdef RADIOTAP_SUPPORT_OVERRIDES - iterator->n_overrides = 0; - iterator->overrides = NULL; -#endif - - /* find payload start allowing for extended bitmap(s) */ - - if (iterator->_bitmap_shifter & (1<_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; -} - -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; - } -} - -#ifdef RADIOTAP_SUPPORT_OVERRIDES -static int find_override(struct ieee80211_radiotap_iterator *iterator, - int *align, int *size) -{ - int i; - - if (!iterator->overrides) - return 0; - - for (i = 0; i < iterator->n_overrides; i++) { - if (iterator->_arg_index == iterator->overrides[i].field) { - *align = iterator->overrides[i].align; - *size = iterator->overrides[i].size; - if (!*align) /* erroneous override */ - return 0; - return 1; - } - } - - return 0; -} -#endif - - -/** - * 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: -#ifdef RADIOTAP_SUPPORT_OVERRIDES - if (find_override(iterator, &align, &size)) { - /* all set */ - } else -#endif - 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; - } -}