802.11

I see in the 802.11 header that there is no ethertype field. How is that possible ? If 802.11 is carrying any higher layer protocol, it's 802.11 header Type/Subtype field will be "Data" (0x20) or "Qos Data" (0x28), and there will usually be a SNAP header (rfc1042) above the 802.11 header which will convey the type of payload (IP, ARP etc.) It is of course in theory able to carry any layer 2 protocol, and use any LLC header. 来源： https://stackoverflow.com/questions/32233879/is-there-an-ethertype-field-in-802-11-header

I'm developing a system of indoor position use wifi. however I am having problems with relation to this library of apple. was once private is now public. where I use the code. libHandle = dlopen(”/System/Library/SystemConfiguration/IPConfiguration.bundle/IPConfiguration”, RTLD_LAZY); apple80211Open = dlsym(libHandle, “Apple80211Open”); apple80211Bind = dlsym(libHandle, “Apple80211BindToInterface”); apple80211Close = dlsym(libHandle, “Apple80211Close”); apple80211Scan = dlsym(libHandle, “Apple80211Scan”); apple80211Open(&airportHandle); apple80211Bind(airportHandle, @”en0″); this is code work

Closed. This question is off-topic . It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . Basically I want a simple C code which illustrates capturing packet in promiscuous mode and extracts out ssid from them. Edit1 I am writing the code which I wrote to perform basic sniffing. #include <stdio.h> #include <pcap.h> int main(int argc, char *argv[]){ pcap_t *handle; struct pcap_pkthdr header; const u_char *packet; int i; char *dev, errbuf[PCAP_ERRBUF_SIZE]; // dev = pcap_lookupdev(errbuf); dev = argv[1

I'm trying to use SCAPY to create a sniffing program to demonstrate 802.11 device association[s] and roles within an 802.11 network. SCAPY has simple functions to identify Beacon frames, probe requests and probe responses. I'm trying to dig a bit deeper than that and do my own evaluation based upon the DS status to show all other traffic association[s]. What I cannot do it determine how to get the value of the DS status (00, 01,10,11). If determined, then I can handle the frame accordingly to get SOURCE, BSSID, RECEIVER, TRANSMITTER and DESTINATION to suit my code. I have found that I should

There is so many structures in the Linux wireless driver mac80211. Things like struct net_device , struct ieee80211_hw , struct ieee80211_vif and struct ieee80211_local and so on. So many structures that I don't understand what information they contain and when them were initialized. How can I learn about them and the whole architecture of wireless drivers? eyalsh You may want to check out Johannes Berg's (mac80211 maintainer) slides here: http://wireless.kernel.org/en/developers/Documentation/mac80211?action=AttachFile&do=get&target=mac80211.pdf They may be somewhat outdated but should give

I want to learn about how nl80211 and cfg80211 works in detail. Function flow, how nl80211 interact with network tools like wpa_supplicant , iw . Plz suggest me some useful links or books to refer. To be able to control wireless drivers from userspace, some IPC communication processes between kernel and userspace are used. At first ioctl with vendor dependent APIs was used. In 1996, Jean Tourrilhes creates wireless extensions (WE or WEXT). The Wireless Extension (WE) is a generic API allowing a driver to expose to the user space configuration and statistics specific to common Wireless LANs. In