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iPXE
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The 802.2 LLC/SNAP header sent before actual data in a data frame. More...
#include <ieee80211.h>
Data Fields | |
| u8 | dsap |
| Destination SAP ID. More... | |
| u8 | ssap |
| Source SAP ID. More... | |
| u8 | ctrl |
| Control information. More... | |
| u8 | oui [3] |
| Organization code, usually 0. More... | |
| u16 | ethertype |
| Ethernet Type field. More... | |
The 802.2 LLC/SNAP header sent before actual data in a data frame.
This header is not acknowledged in the 802.11 standard at all; it is treated just like data for MAC-layer purposes, including fragmentation and encryption. It is actually two headers concatenated: a three-byte 802.2 LLC header indicating Subnetwork Accesss Protocol (SNAP) in both source and destination Service Access Point (SAP) fields, and a five-byte SNAP header indicating a zero OUI and two-byte Ethernet protocol type field.
Thus, an eight-byte header in which six of the bytes are redundant. Lovely, isn't it?
Definition at line 324 of file ieee80211.h.
| u8 ieee80211_llc_snap_header::dsap |
Destination SAP ID.
Definition at line 327 of file ieee80211.h.
Referenced by net80211_ll_pull(), and net80211_ll_push().
| u8 ieee80211_llc_snap_header::ssap |
Source SAP ID.
Definition at line 328 of file ieee80211.h.
Referenced by net80211_ll_pull(), and net80211_ll_push().
| u8 ieee80211_llc_snap_header::ctrl |
Control information.
Definition at line 329 of file ieee80211.h.
Referenced by net80211_ll_pull(), and net80211_ll_push().
| u8 ieee80211_llc_snap_header::oui[3] |
Organization code, usually 0.
Definition at line 332 of file ieee80211.h.
Referenced by net80211_ll_pull(), and net80211_ll_push().
| u16 ieee80211_llc_snap_header::ethertype |
Ethernet Type field.
Definition at line 333 of file ieee80211.h.
Referenced by net80211_ll_pull(), and net80211_ll_push().
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