From: g0dil Date: Fri, 20 Aug 2010 06:40:15 +0000 (+0000) Subject: Packets/80211Bundle: Read-only radiotap reimplementation X-Git-Url: http://g0dil.de/git?a=commitdiff_plain;h=0d88f940c093ff9c34099c9ab5c43e340f60a1f0;p=senf.git Packets/80211Bundle: Read-only radiotap reimplementation git-svn-id: https://svn.berlios.de/svnroot/repos/senf/trunk@1691 270642c3-0616-0410-b53a-bc976706d245 --- diff --git a/senf/Packets/80211Bundle/RadiotapPacket.cc b/senf/Packets/80211Bundle/RadiotapPacket.cc index 474f4b0..ceff474 100644 --- a/senf/Packets/80211Bundle/RadiotapPacket.cc +++ b/senf/Packets/80211Bundle/RadiotapPacket.cc @@ -29,22 +29,59 @@ #include "WLANPacket.hh" #include +extern "C" { +# include "radiotap/radiotap_iter.h" +} + #define prefix_ ///////////////////////////////cc.p////////////////////////////////////// -namespace { - #define DUMP_OPTIONAL_FIELD(name, sign, desc) \ - if (p->has_##name()) \ - os << senf::fieldName(desc) << sign( p->name()) \ - << std::endl; +prefix_ void senf::RadiotapPacketParser::fillOffsetTable(boost::uint8_t * data, int maxLength, + OffsetTable & table) +{ + struct ieee80211_radiotap_iterator iter; + ieee80211_radiotap_iterator_init(&iter, + (struct ieee80211_radiotap_header *)data, + maxLength, + 0); + while (ieee80211_radiotap_iterator_next(&iter)==0) { + if (iter.is_radiotap_ns && + iter.this_arg_index <= int(senf::RadiotapPacketParser::MAX_INDEX)) { + table[iter.this_arg_index] = iter.this_arg - data; + std::cerr << ">> " << iter.this_arg_index << " " << table[iter.this_arg_index] << "\n"; + } + } + table[MAX_INDEX+1] = iter.this_arg - data + iter.this_arg_size; + std::cerr << ">> size " << table[MAX_INDEX+1] << "\n"; +} + +prefix_ senf::RadiotapPacketParser::OffsetTable const & +senf::RadiotapPacketParser::offsetTable(boost::uint32_t presentFlags) +{ + typedef std::map OffsetMap; + static OffsetMap offsetMap; + + OffsetMap::iterator i (offsetMap.find(presentFlags)); + if (i == offsetMap.end()) { + OffsetTable table; + fillOffsetTable(&(*data().begin()), data().size(), table); + i = offsetMap.insert(std::make_pair(presentFlags, table)).first; + } + return i->second; } + +#define DUMP_OPTIONAL_FIELD(name, sign, desc) \ + if (p->name ## Present()) \ + os << senf::fieldName(desc) << sign(p->name()) \ + << std::endl; + prefix_ void senf::RadiotapPacketType::dump(packet p, std::ostream &os) { boost::io::ios_all_saver ias(os); os << "Radiotap:\n" - << senf::fieldName("version") << unsigned( p->version()) << "\n" - << senf::fieldName("length") << unsigned( p->length()) << "\n"; + << senf::fieldName("version") << unsigned(p->version()) << "\n" + << senf::fieldName("length") << unsigned(p->length()) << "\n"; // TODO: flags, channelOptions DUMP_OPTIONAL_FIELD( tsft, unsigned, "MAC timestamp" ); DUMP_OPTIONAL_FIELD( rate, unsigned, "rate" ); @@ -58,10 +95,13 @@ prefix_ void senf::RadiotapPacketType::dump(packet p, std::ostream &os) DUMP_OPTIONAL_FIELD( antenna, unsigned, "antenna" ); DUMP_OPTIONAL_FIELD( dbAntennaSignal, unsigned, "antenna signal (dB)" ); DUMP_OPTIONAL_FIELD( dbAntennaNoise, unsigned, "antenna noise (dB)" ); - if (p->has_headerFcs()) - os << senf::fieldName("FCS") << unsigned( p->fcs()) << "\n"; + DUMP_OPTIONAL_FIELD( headerFcs, unsigned, "FCS (in header)" ); + if (p->flagsPresent() && p->flags().fcsAtEnd()) + os << senf::fieldName("FCS (at end)") << unsigned(p->fcs()) << "\n"; } +#undef DUMP_OPTIONAL_FIELD + prefix_ void senf::RadiotapPacketType::finalize(packet p) { p->length() << p->calculateSize(); diff --git a/senf/Packets/80211Bundle/RadiotapPacket.hh b/senf/Packets/80211Bundle/RadiotapPacket.hh index 40f3def..966f2b7 100644 --- a/senf/Packets/80211Bundle/RadiotapPacket.hh +++ b/senf/Packets/80211Bundle/RadiotapPacket.hh @@ -28,6 +28,7 @@ // Custom includes #include +#include ///////////////////////////////hh.p//////////////////////////////////////// namespace senf { @@ -38,7 +39,7 @@ namespace senf { */ struct RadiotapPacketParser_Flags : public PacketParserBase { - # include SENF_FIXED_PARSER() +# include SENF_FIXED_PARSER() SENF_PARSER_BITFIELD ( shortGI, 1, bool ); SENF_PARSER_BITFIELD ( badFCS, 1, bool ); @@ -58,7 +59,7 @@ namespace senf { */ struct RadiotapPacketParser_ChannelOptions : public PacketParserBase { - # include SENF_FIXED_PARSER() +# include SENF_FIXED_PARSER() SENF_PARSER_FIELD ( freq, UInt16LSBParser ); @@ -96,18 +97,21 @@ namespace senf { \todo extended present field (bit 31 of present field is set) */ - struct RadiotapPacketParser : public PacketParserBase + struct RadiotapPacketParser_Header : public PacketParserBase { - # include SENF_PARSER() +# include SENF_FIXED_PARSER() /* * mandatory fields */ SENF_PARSER_FIELD ( version, UInt8Parser ); //padding bits, currently unused, it simply aligns the fields onto natural word boundaries. - SENF_PARSER_SKIP ( 1,1 ); + SENF_PARSER_SKIP ( 1 ); SENF_PARSER_FIELD ( length, UInt16LSBParser ); + SENF_PARSER_PRIVATE_FIELD ( presentFlags, UInt32LSBParser ); + SENF_PARSER_GOTO( presentFlags ); + /* * present flags * indicate which data field are contained in the packet @@ -130,74 +134,87 @@ namespace senf { SENF_PARSER_BITFIELD_RO ( txAttenuationPresent, 1, bool ); SENF_PARSER_SKIP_BITS ( 8 ); //currently unused bits //if bit is set,another 32 bit present flag is attached (not implemented yet) - SENF_PARSER_BITFIELD ( extendedBitmaskPresent, 1, bool ); + SENF_PARSER_BITFIELD_RO ( extendedBitmaskPresent, 1, bool ); SENF_PARSER_SKIP_BITS ( 7 ); //currently unused bits - SENF_PARSER_LABEL( headerEnd_ ); + SENF_PARSER_FINALIZE ( RadiotapPacketParser_Header ); + }; - /* - * Radiotap data - * parsing data according to present flags - * - * PARSER_SKIP required to skip correct length of padding bits - */ + struct RadiotapPacketParser_FrameType : public PacketParserBase + { +# include SENF_FIXED_PARSER() - /* macro to create required variant parser */ - #define OPTIONAL_FIELD(name, parser) SENF_PARSER_VARIANT \ - ( name##_, name##Present, \ - ( novalue( disable_##name, VoidPacketParser )) \ - ( id( name, parser )) ) - - /* macro to create padding parser */ - #define SKIP_OPTIONAL_PADDING(cond, parser, size) \ - SENF_PARSER_SKIP( \ - (cond ? (size - (parser##__offset() + \ - senf::bytes(parser##_())) % size) % size : 0) , 0 ); - - OPTIONAL_FIELD ( tsft, UInt64LSBParser ); - OPTIONAL_FIELD ( flags, RadiotapPacketParser_Flags ); //(data().end()-4); - } - - SENF_PARSER_INIT() { - version() = 0; - } - - // The headers length is to be taken from the 'length' value - SENF_PARSER_GOTO_OFFSET( length(), headerEnd__init_bytes ); - - SENF_PARSER_FINALIZE( RadiotapPacketParser ); - - SENF_PARSER_SKIP_BITS( 4 ); - SENF_PARSER_BITFIELD_RO ( frameType, 2, unsigned ); - SENF_PARSER_SKIP_BITS( 2 ); + SENF_PARSER_SKIP_BITS(4); + SENF_PARSER_BITFIELD_RO( frameType, 2, unsigned ); + SENF_PARSER_SKIP_BITS(2); + + SENF_PARSER_FINALIZE(RadiotapPacketParser_FrameType); + }; + + struct RadiotapPacketParser : public RadiotapPacketParser_Header + { + RadiotapPacketParser(data_iterator i, state_type s) : RadiotapPacketParser_Header(i,s) {} + + static const size_type init_bytes = RadiotapPacketParser_Header::fixed_bytes; + + size_type bytes() const { return length(); } + + // //////////////////////////////////////////////////////////////////////// + + UInt64LSBParser tsft() + { return parseField (0); } + RadiotapPacketParser_Flags flags() + { return parseField (1); } + UInt8Parser rate() + { return parseField (2); } + RadiotapPacketParser_ChannelOptions channelOptions() + { return parseField(3); } + UInt16LSBParser fhss() + { return parseField (4); } + Int8Parser dbmAntennaSignal() + { return parseField (5); } + Int8Parser dbmAntennaNoise() + { return parseField (6); } + UInt16LSBParser lockQuality() + { return parseField (7); } + UInt16LSBParser txAttenuation() + { return parseField (8); } + UInt16LSBParser dbTxAttenuation() + { return parseField (9); } + Int8Parser dbmTxAttenuation() + { return parseField (10); } + UInt8Parser antenna() + { return parseField (11); } + UInt8Parser dbAntennaSignal() + { return parseField (12); } + UInt8Parser dbAntennaNoise() + { return parseField (13); } + UInt32Parser headerFcs() + { return parseField (14); } + + unsigned frameType() + { return parse(length()).frameType(); } + + UInt32Parser fcs() + { return parse(data().end()-4); } + + private: + static const size_type fixed_bytes = 0; // 'remove' this member ... + static const unsigned MAX_INDEX = 14; + + typedef boost::array OffsetTable; + + OffsetTable const & offsetTable(boost::uint32_t presentFlags); + static void fillOffsetTable(boost::uint8_t * data, int maxLength, OffsetTable & table); + + template + Parser parseField(unsigned index) + { return parse(offsetTable(presentFlags())[index]); } + + size_type calculateSize() + { return offsetTable(presentFlags())[MAX_INDEX+1]; } + + friend class RadiotapPacketType; }; /** \brief Radiotap packet diff --git a/senf/Packets/80211Bundle/RadiotapPacket.test.cc b/senf/Packets/80211Bundle/RadiotapPacket.test.cc index bd20348..91c1e80 100644 --- a/senf/Packets/80211Bundle/RadiotapPacket.test.cc +++ b/senf/Packets/80211Bundle/RadiotapPacket.test.cc @@ -99,6 +99,7 @@ SENF_AUTO_UNIT_TEST(RadiotapPacket_packet) SENF_CHECK_NO_THROW( p.dump( oss)); } +#if 0 SENF_AUTO_UNIT_TEST(RadiotapPacket_create) { unsigned char data[] = { @@ -154,6 +155,7 @@ SENF_AUTO_UNIT_TEST(RadiotapPacket_create) BOOST_CHECK_EQUAL_COLLECTIONS( p.data().begin(), p.data().end(), data, data+sizeof(data)/sizeof(data[0]) ); } +#endif SENF_AUTO_UNIT_TEST(RadiotapPacket_packet_ath9k) { @@ -173,7 +175,12 @@ SENF_AUTO_UNIT_TEST(RadiotapPacket_packet_ath9k) BOOST_CHECK_EQUAL( p->dbmAntennaSignal(), -78); BOOST_CHECK_EQUAL( p->dbmAntennaNoise(), -95); +#if 0 + // The standard defines this field as RXFlags / TXFLags, so using the + // 'official' radiotap parser, this test fails ... + // Why is this field parsed using MSB byteorder ?? BOOST_CHECK_EQUAL( p->headerFcs(), 0xd51af794); +#endif BOOST_CHECK_EQUAL( p->antenna(), 0u); } diff --git a/senf/Packets/80211Bundle/SConscript b/senf/Packets/80211Bundle/SConscript index 9f77b74..6c532af 100644 --- a/senf/Packets/80211Bundle/SConscript +++ b/senf/Packets/80211Bundle/SConscript @@ -5,4 +5,6 @@ import SENFSCons ########################################################################### -SENFSCons.AutoPacketBundle(env, '80211Bundle') +SConscript(env.Glob("*/SConscript")) + +SENFSCons.AutoPacketBundle(env, '80211Bundle', subdirs=['radiotap']) diff --git a/senf/Packets/80211Bundle/radiotap/SConscript b/senf/Packets/80211Bundle/radiotap/SConscript new file mode 100644 index 0000000..0b12252 --- /dev/null +++ b/senf/Packets/80211Bundle/radiotap/SConscript @@ -0,0 +1,20 @@ +# -*- python -*- + +Import('env') +import SENFSCons + +env.SetDefault( + RADIOTAP_FILES = env.Glob("*.h") + env.Glob("*.c"), + RADIOTAP_URL = 'http://git.sipsolutions.net/radiotap.git', + ) + +env.PhonyTarget( + 'update-radiotap', [], + [ Delete('$GITDIR'), + 'git clone $RADIOTAP_URL $GITDIR', + 'cp $_RADIOTAP_FILES $HERE', + Delete('$GITDIR') ], + HERE = env.Dir('.'), + GITDIR = env.Dir('radiotap.git'), + _RADIOTAP_FILES = [ env.Dir('radiotap.git').File(f) + for f in env.Flatten(env.subst_list('$RADIOTAP_FILES')) ]) diff --git a/senf/Packets/80211Bundle/radiotap/platform.h b/senf/Packets/80211Bundle/radiotap/platform.h new file mode 100644 index 0000000..9ab734b --- /dev/null +++ b/senf/Packets/80211Bundle/radiotap/platform.h @@ -0,0 +1,19 @@ +#include +#include +#ifndef _BSD_SOURCE +#define _BSD_SOURCE +#endif +#include + +#define le16_to_cpu le16toh +#define le32_to_cpu le32toh +#define get_unaligned(p) \ +({ \ + struct packed_dummy_struct { \ + typeof(*(p)) __val; \ + } __attribute__((packed)) *__ptr = (void *) (p); \ + \ + __ptr->__val; \ +}) +#define get_unaligned_le16(p) le16_to_cpu(get_unaligned((uint16_t *)(p))) +#define get_unaligned_le32(p) le32_to_cpu(get_unaligned((uint32_t *)(p))) diff --git a/senf/Packets/80211Bundle/radiotap/radiotap.c b/senf/Packets/80211Bundle/radiotap/radiotap.c new file mode 100644 index 0000000..6683d6a --- /dev/null +++ b/senf/Packets/80211Bundle/radiotap/radiotap.c @@ -0,0 +1,376 @@ +/* + * 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" + +/* 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, }, + /* + * 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) +{ + /* 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) & + (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 > + (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, vnslen; + 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; + + /* + * 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->_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; + } +} diff --git a/senf/Packets/80211Bundle/radiotap/radiotap.h b/senf/Packets/80211Bundle/radiotap/radiotap.h new file mode 100644 index 0000000..09b1ee0 --- /dev/null +++ b/senf/Packets/80211Bundle/radiotap/radiotap.h @@ -0,0 +1,245 @@ +/*- + * Copyright (c) 2003, 2004 David Young. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of David Young may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID + * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED + * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + */ + +/* + * Modifications to fit into the linux IEEE 802.11 stack, + * Mike Kershaw (dragorn@kismetwireless.net) + */ + +#ifndef IEEE80211RADIOTAP_H +#define IEEE80211RADIOTAP_H + +#include + +/* Base version of the radiotap packet header data */ +#define PKTHDR_RADIOTAP_VERSION 0 + +/* A generic radio capture format is desirable. There is one for + * Linux, but it is neither rigidly defined (there were not even + * units given for some fields) nor easily extensible. + * + * I suggest the following extensible radio capture format. It is + * based on a bitmap indicating which fields are present. + * + * I am trying to describe precisely what the application programmer + * should expect in the following, and for that reason I tell the + * units and origin of each measurement (where it applies), or else I + * use sufficiently weaselly language ("is a monotonically nondecreasing + * function of...") that I cannot set false expectations for lawyerly + * readers. + */ + +/* The radio capture header precedes the 802.11 header. + * All data in the header is little endian on all platforms. + */ +struct ieee80211_radiotap_header { + uint8_t it_version; /* Version 0. Only increases + * for drastic changes, + * introduction of compatible + * new fields does not count. + */ + uint8_t it_pad; + uint16_t it_len; /* length of the whole + * header in bytes, including + * it_version, it_pad, + * it_len, and data fields. + */ + uint32_t it_present; /* A bitmap telling which + * fields are present. Set bit 31 + * (0x80000000) to extend the + * bitmap by another 32 bits. + * Additional extensions are made + * by setting bit 31. + */ +}; + +/* Name Data type Units + * ---- --------- ----- + * + * IEEE80211_RADIOTAP_TSFT __le64 microseconds + * + * Value in microseconds of the MAC's 64-bit 802.11 Time + * Synchronization Function timer when the first bit of the + * MPDU arrived at the MAC. For received frames, only. + * + * IEEE80211_RADIOTAP_CHANNEL 2 x uint16_t MHz, bitmap + * + * Tx/Rx frequency in MHz, followed by flags (see below). + * + * IEEE80211_RADIOTAP_FHSS uint16_t see below + * + * For frequency-hopping radios, the hop set (first byte) + * and pattern (second byte). + * + * IEEE80211_RADIOTAP_RATE u8 500kb/s + * + * Tx/Rx data rate + * + * IEEE80211_RADIOTAP_DBM_ANTSIGNAL s8 decibels from + * one milliwatt (dBm) + * + * RF signal power at the antenna, decibel difference from + * one milliwatt. + * + * IEEE80211_RADIOTAP_DBM_ANTNOISE s8 decibels from + * one milliwatt (dBm) + * + * RF noise power at the antenna, decibel difference from one + * milliwatt. + * + * IEEE80211_RADIOTAP_DB_ANTSIGNAL u8 decibel (dB) + * + * RF signal power at the antenna, decibel difference from an + * arbitrary, fixed reference. + * + * IEEE80211_RADIOTAP_DB_ANTNOISE u8 decibel (dB) + * + * RF noise power at the antenna, decibel difference from an + * arbitrary, fixed reference point. + * + * IEEE80211_RADIOTAP_LOCK_QUALITY uint16_t unitless + * + * Quality of Barker code lock. Unitless. Monotonically + * nondecreasing with "better" lock strength. Called "Signal + * Quality" in datasheets. (Is there a standard way to measure + * this?) + * + * IEEE80211_RADIOTAP_TX_ATTENUATION uint16_t unitless + * + * Transmit power expressed as unitless distance from max + * power set at factory calibration. 0 is max power. + * Monotonically nondecreasing with lower power levels. + * + * IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t decibels (dB) + * + * Transmit power expressed as decibel distance from max power + * set at factory calibration. 0 is max power. Monotonically + * nondecreasing with lower power levels. + * + * IEEE80211_RADIOTAP_DBM_TX_POWER s8 decibels from + * one milliwatt (dBm) + * + * Transmit power expressed as dBm (decibels from a 1 milliwatt + * reference). This is the absolute power level measured at + * the antenna port. + * + * IEEE80211_RADIOTAP_FLAGS u8 bitmap + * + * Properties of transmitted and received frames. See flags + * defined below. + * + * IEEE80211_RADIOTAP_ANTENNA u8 antenna index + * + * Unitless indication of the Rx/Tx antenna for this packet. + * The first antenna is antenna 0. + * + * IEEE80211_RADIOTAP_RX_FLAGS uint16_t bitmap + * + * Properties of received frames. See flags defined below. + * + * IEEE80211_RADIOTAP_TX_FLAGS uint16_t bitmap + * + * Properties of transmitted frames. See flags defined below. + * + * IEEE80211_RADIOTAP_RTS_RETRIES u8 data + * + * Number of rts retries a transmitted frame used. + * + * IEEE80211_RADIOTAP_DATA_RETRIES u8 data + * + * Number of unicast retries a transmitted frame used. + * + */ +enum ieee80211_radiotap_type { + IEEE80211_RADIOTAP_TSFT = 0, + IEEE80211_RADIOTAP_FLAGS = 1, + IEEE80211_RADIOTAP_RATE = 2, + IEEE80211_RADIOTAP_CHANNEL = 3, + IEEE80211_RADIOTAP_FHSS = 4, + IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5, + IEEE80211_RADIOTAP_DBM_ANTNOISE = 6, + IEEE80211_RADIOTAP_LOCK_QUALITY = 7, + IEEE80211_RADIOTAP_TX_ATTENUATION = 8, + IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, + IEEE80211_RADIOTAP_DBM_TX_POWER = 10, + IEEE80211_RADIOTAP_ANTENNA = 11, + IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12, + IEEE80211_RADIOTAP_DB_ANTNOISE = 13, + IEEE80211_RADIOTAP_RX_FLAGS = 14, + IEEE80211_RADIOTAP_TX_FLAGS = 15, + IEEE80211_RADIOTAP_RTS_RETRIES = 16, + IEEE80211_RADIOTAP_DATA_RETRIES = 17, + + /* valid in every it_present bitmap, even vendor namespaces */ + IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29, + IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30, + IEEE80211_RADIOTAP_EXT = 31 +}; + +/* Channel flags. */ +#define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */ +#define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */ +#define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */ +#define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */ +#define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */ +#define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */ +#define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */ +#define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */ + +/* For IEEE80211_RADIOTAP_FLAGS */ +#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received + * during CFP + */ +#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received + * with short + * preamble + */ +#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received + * with WEP encryption + */ +#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received + * with fragmentation + */ +#define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */ +#define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between + * 802.11 header and payload + * (to 32-bit boundary) + */ +#define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* frame failed FCS check */ + +/* For IEEE80211_RADIOTAP_RX_FLAGS */ +#define IEEE80211_RADIOTAP_F_RX_BADPLCP 0x0002 /* bad PLCP */ + +/* For IEEE80211_RADIOTAP_TX_FLAGS */ +#define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive + * retries */ +#define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */ +#define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */ + +#endif /* IEEE80211_RADIOTAP_H */ diff --git a/senf/Packets/80211Bundle/radiotap/radiotap_iter.h b/senf/Packets/80211Bundle/radiotap/radiotap_iter.h new file mode 100644 index 0000000..b768c85 --- /dev/null +++ b/senf/Packets/80211Bundle/radiotap/radiotap_iter.h @@ -0,0 +1,96 @@ +#ifndef __RADIOTAP_ITER_H +#define __RADIOTAP_ITER_H + +#include +#include "radiotap.h" + +/* Radiotap header iteration + * implemented in radiotap.c + */ + +struct radiotap_override { + uint8_t field; + uint8_t align:4, size:4; +}; + +struct radiotap_align_size { + uint8_t align:4, size:4; +}; + +struct ieee80211_radiotap_namespace { + const struct radiotap_align_size *align_size; + int n_bits; + uint32_t oui; + uint8_t subns; +}; + +struct ieee80211_radiotap_vendor_namespaces { + const struct ieee80211_radiotap_namespace *ns; + int n_ns; +}; + +/** + * struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args + * @this_arg_index: index of current arg, valid after each successful call + * to ieee80211_radiotap_iterator_next() + * @this_arg: pointer to current radiotap arg; it is valid after each + * call to ieee80211_radiotap_iterator_next() but also after + * ieee80211_radiotap_iterator_init() where it will point to + * the beginning of the actual data portion + * @this_arg_size: length of the current arg, for convenience + * @current_namespace: pointer to the current namespace definition + * (or internally %NULL if the current namespace is unknown) + * @is_radiotap_ns: indicates whether the current namespace is the default + * radiotap namespace or not + * + * @overrides: override standard radiotap fields + * @n_overrides: number of overrides + * + * @_rtheader: pointer to the radiotap header we are walking through + * @_max_length: length of radiotap header in cpu byte ordering + * @_arg_index: next argument index + * @_arg: next argument pointer + * @_next_bitmap: internal pointer to next present u32 + * @_bitmap_shifter: internal shifter for curr u32 bitmap, b0 set == arg present + * @_vns: vendor namespace definitions + * @_next_ns_data: beginning of the next namespace's data + * @_reset_on_ext: internal; reset the arg index to 0 when going to the + * next bitmap word + * + * Describes the radiotap parser state. Fields prefixed with an underscore + * must not be used by users of the parser, only by the parser internally. + */ + +struct ieee80211_radiotap_iterator { + struct ieee80211_radiotap_header *_rtheader; + const struct ieee80211_radiotap_vendor_namespaces *_vns; + const struct ieee80211_radiotap_namespace *current_namespace; + + unsigned char *_arg, *_next_ns_data; + uint32_t *_next_bitmap; + + unsigned char *this_arg; +#ifdef RADIOTAP_SUPPORT_OVERRIDES + const struct radiotap_override *overrides; + int n_overrides; +#endif + int this_arg_index; + int this_arg_size; + + int is_radiotap_ns; + + int _max_length; + int _arg_index; + uint32_t _bitmap_shifter; + int _reset_on_ext; +}; + +extern 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); + +extern int ieee80211_radiotap_iterator_next( + struct ieee80211_radiotap_iterator *iterator); + +#endif /* __RADIOTAP_ITER_H */ diff --git a/senf/Packets/PacketParser.ct b/senf/Packets/PacketParser.ct index 01569dd..5934762 100644 --- a/senf/Packets/PacketParser.ct +++ b/senf/Packets/PacketParser.ct @@ -59,7 +59,7 @@ prefix_ Parser senf::operator<<(Parser target, Parser source) template prefix_ senf::PacketParserBase::size_type senf::detail::packetParserSize(Parser p, ...) { - return p.bytes(); + return Parser::fixed_bytes; } ///////////////////////////////ct.e//////////////////////////////////////// diff --git a/senf/Packets/PacketParser.cti b/senf/Packets/PacketParser.cti index ca2a4c4..48f2334 100644 --- a/senf/Packets/PacketParser.cti +++ b/senf/Packets/PacketParser.cti @@ -108,9 +108,9 @@ prefix_ Parser senf::operator<<(Parser target, Value const & value) template prefix_ senf::PacketParserBase::size_type -senf::detail::packetParserSize(Parser p, int, senf::mpl::take_uint *) +senf::detail::packetParserSize(Parser p, int, senf::mpl::take_uint *) { - return Parser::fixed_bytes; + return p.bytes(); } diff --git a/senf/Packets/PacketParser.ih b/senf/Packets/PacketParser.ih index 2eb95af..c55be7e 100644 --- a/senf/Packets/PacketParser.ih +++ b/senf/Packets/PacketParser.ih @@ -38,12 +38,12 @@ namespace detail { # ifndef DOXYGEN - // Use SFINAE to check, if Parser has an integer-valued fixed_bytes member. If not, - // 'Parser_TakeNum' fails and the overload is removed from the overload + // Use SFINAE to check, if Parser has an integer-valued init_bytes member. If not, + // 'Parser_TakeNum' fails and the overload is removed from the overload // set. template PacketParserBase::size_type packetParserSize( - Parser p, int, senf::mpl::take_uint * = 0); + Parser p, int, senf::mpl::take_uint * = 0); // An ellipsis is always the worst match. A call 'packetParserSize(p,0) will prefer above // overload if that is not disabled by SFINAE. diff --git a/site_scons/SENFSCons.py b/site_scons/SENFSCons.py index 09e4c4d..e64e844 100644 --- a/site_scons/SENFSCons.py +++ b/site_scons/SENFSCons.py @@ -6,12 +6,14 @@ from SCons.Script import * def Glob(env, exclude=[], subdirs=[]): testSources = env.Glob("*.test.cc",strings=True) sources = [ x - for x in env.Glob("*.cc",strings=True) + for x in env.Glob("*.cc",strings=True) \ + + env.Glob("*.c",strings=True) if x not in testSources and x not in exclude ] for subdir in subdirs: testSources += env.Glob(os.path.join(subdir,"*.test.cc"),strings=True) sources += [ x - for x in env.Glob(os.path.join(subdir,"*.cc"),strings=True) + for x in env.Glob(os.path.join(subdir,"*.cc"),strings=True) \ + + env.Glob(os.path.join(subdir,"*.c"),strings=True) if x not in testSources and x not in exclude ] includes = [] for d in [ '' ] + [ x+'/' for x in subdirs ]: