On Tue, 2007-03-20 at 10:39 +0000, andy@xxxxxxxxxxx wrote: > +++ b/Documentation/networking/mac80211-injection.txt This needs to be for cfg80211. > +Radiotap headers are variable-length and extensible, you can get most of the > +information you need to know on them from: > + > +./include/net/ieee80211_radiotap.h > + > +But note: all fields in the radiotap header are *little endian*. > + > +There is a fixed portion at the start which contains a u32 bitmap that defines > +if the possible argument is present or not. At the moment there are only 13 > +possible arguments defined, but in case we run out of space in the u32 it is > +defined that b31 set indicates that there is another u32 bitmap following, and > +the start of the arguments is moved forward 4 bytes each time. Drop all that, it's generic radiotap description. Put it into another file if you want. > +After the fixed part of the header, the arguments follow. > + > + - the arguments are all little-endian! duplicated information. > +The ieee80211 header follows immediately afterwards, looking for example like > +this: > + > + 0x08, 0x01, 0x00, 0x00, > + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, > + 0x13, 0x22, 0x33, 0x44, 0x55, 0x66, > + 0x13, 0x22, 0x33, 0x44, 0x55, 0x66, > + 0x10, 0x86 > + > +Then lastly there is the payload. Scratch that, somebody who doesn't know how a IEEE 802.11 header looks like has no business reading that file anyway ;) > Libpcap can also be used, > +(which is easier than doing the work to bind the socket to the right > +interface), along the following lines: > + > + ppcap = pcap_open_live(szInterfaceName, 800, 1, 20, szErrbuf); > +... > + r = pcap_inject(ppcap, u8aSendBuffer, nLength); > + > +You can also find sources for a complete inject test applet here: > + > +http://penumbra.warmcat.com/_twk/tiki-index.php?page=packetspammer Is it big enough to warrant being elsewhere? I don't see how an example program can be more than a few lines of code and then it could be included here as a C file. johannes
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