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Diffstat (limited to 'Documentation/networking/mac80211-injection.txt')
| -rw-r--r-- | Documentation/networking/mac80211-injection.txt | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/Documentation/networking/mac80211-injection.txt b/Documentation/networking/mac80211-injection.txt deleted file mode 100644 index d58d78df9ca2..000000000000 --- a/Documentation/networking/mac80211-injection.txt +++ /dev/null @@ -1,97 +0,0 @@ -How to use packet injection with mac80211 -========================================= - -mac80211 now allows arbitrary packets to be injected down any Monitor Mode -interface from userland. The packet you inject needs to be composed in the -following format: - - [ radiotap header ] - [ ieee80211 header ] - [ payload ] - -The radiotap format is discussed in -./Documentation/networking/radiotap-headers.txt. - -Despite many radiotap parameters being currently defined, most only make sense -to appear on received packets. The following information is parsed from the -radiotap headers and used to control injection: - - * IEEE80211_RADIOTAP_FLAGS - - IEEE80211_RADIOTAP_F_FCS: FCS will be removed and recalculated - IEEE80211_RADIOTAP_F_WEP: frame will be encrypted if key available - IEEE80211_RADIOTAP_F_FRAG: frame will be fragmented if longer than the - current fragmentation threshold. - - * IEEE80211_RADIOTAP_TX_FLAGS - - IEEE80211_RADIOTAP_F_TX_NOACK: frame should be sent without waiting for - an ACK even if it is a unicast frame - - * IEEE80211_RADIOTAP_RATE - - legacy rate for the transmission (only for devices without own rate control) - - * IEEE80211_RADIOTAP_MCS - - HT rate for the transmission (only for devices without own rate control). - Also some flags are parsed - - IEEE80211_RADIOTAP_MCS_SGI: use short guard interval - IEEE80211_RADIOTAP_MCS_BW_40: send in HT40 mode - - * IEEE80211_RADIOTAP_DATA_RETRIES - - number of retries when either IEEE80211_RADIOTAP_RATE or - IEEE80211_RADIOTAP_MCS was used - - * IEEE80211_RADIOTAP_VHT - - VHT mcs and number of streams used in the transmission (only for devices - without own rate control). Also other fields are parsed - - flags field - IEEE80211_RADIOTAP_VHT_FLAG_SGI: use short guard interval - - bandwidth field - 1: send using 40MHz channel width - 4: send using 80MHz channel width - 11: send using 160MHz channel width - -The injection code can also skip all other currently defined radiotap fields -facilitating replay of captured radiotap headers directly. - -Here is an example valid radiotap header defining some parameters - - 0x00, 0x00, // <-- radiotap version - 0x0b, 0x00, // <- radiotap header length - 0x04, 0x0c, 0x00, 0x00, // <-- bitmap - 0x6c, // <-- rate - 0x0c, //<-- tx power - 0x01 //<-- antenna - -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. - -After composing the packet contents, it is sent by send()-ing it to a logical -mac80211 interface that is in Monitor mode. 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 a link to a complete inject application here: - -http://wireless.kernel.org/en/users/Documentation/packetspammer - -Andy Green <andy@warmcat.com> |