LLC
[UMAC]

LLC translation definitions. More...

Collaboration diagram for LLC:

Data Structures
struct	llc_snap_short
	LLC/SNAP structure. More...
struct	llc_snap
	LLC/SNAP structure. More...
Variables
struct llc_snap_short	llc_rfc1042_hdr
	RFC1042 LLC/SNAP Header.
struct llc_snap_short	llc_bridge_tunnel_hdr
	Bridge-Tunnel LLC/SNAP Header.
struct llc_snap_short	llc_rfc1042_hdr
	RFC1042 LLC/SNAP Header.
struct llc_snap_short	llc_bridge_tunnel_hdr
	Bridge-Tunnel LLC/SNAP Header.
LLC field definitions
LLC = DSAP + SSAP + CTRL Note: : The 0xAA values indicate the presence of the SNAP
#define	LLC_LLC_LEN   3
#define	LLC_DSAP   0xAA
#define	LLC_SSAP   0xAA
#define	LLC_CTRL   0x03
SNAP field definitions
SNAP = OUI + ETHER_TYPE
#define	LLC_SNAP_LEN   5
#define	LLC_OUI_LEN   3
802.2 Header definitions
The 802.2 Header is the LLC + the SNAP
#define	LLC_802_2_HDR_LEN   (LLC_LLC_LEN + LLC_SNAP_LEN)
802.2 Ethernet definitions
#define	LLC_ETHER_MTU   1500
	Ethernet MTU.
#define	LLC_ETHER_HDR_LEN   14
	Size of the Ethernet header.
#define	LLC_ETHERTYPE_LEN   2
	Size of the Ethernet type.
#define	LLC_ETHERTYPE_LEN_OFT   12
	Offset of the Ethernet type within the header.
#define	LLC_802_2_ETHERTYPE_OFT   6
	Offset of the EtherType in the 802.2 header.
#define	LLC_FRAMELENGTH_MAXVALUE   0x600
	Maximum value of the frame length.
Useful EtherType values
#define	LLC_ETHERTYPE_APPLETALK   0x809B
#define	LLC_ETHERTYPE_IPX   0x8137
#define	LLC_ETHERTYPE_AARP   0x80F3
#define	LLC_ETHERTYPE_EAP_T   0x888E
#define	LLC_ETHERTYPE_802_1Q   0x8100
#define	LLC_ETHERTYPE_IP   0x0800
#define	LLC_ETHERTYPE_ARP   0x0806
802_1Q VLAN header definitions
#define	LLC_802_1Q_TCI_VID_MASK   0x0FFF
#define	LLC_802_1Q_TCI_PRI_MASK   0xE000
#define	LLC_802_1Q_TCI_CFI_MASK   0x1000
#define	LLC_802_1Q_HDR_LEN   4
#define	LLC_802_1Q_VID_NULL   0
#define	LLC_OFFSET_ETHERTYPE   12
#define	LLC_OFFSET_IPV4_PRIO   15
#define	LLC_OFFSET_802_1Q_TCI   14

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Detailed Description

LLC translation definitions.

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Variable Documentation

struct llc_snap_short llc_bridge_tunnel_hdr

Initial value:

 {
                                                        0xAAAA, 
                                                        0x0003, 
                                                        0xF800, 
                                                    }

Bridge-Tunnel LLC/SNAP Header.

Definition at line 37 of file llc.c.

Referenced by rxu_cntrl_mac2eth_update().

struct llc_snap_short llc_rfc1042_hdr

Initial value:

 {
                                                  0xAAAA, 
                                                  0x0003, 
                                                  0x0000, 
                                              }

RFC1042 LLC/SNAP Header.

Definition at line 30 of file llc.c.

Referenced by rxu_cntrl_mac2eth_update().