eth_type_trans (9) - Linux Manuals

eth_type_trans: determine the packet's protocol ID.

Command to display eth_type_trans manual in Linux: $ man 9 eth_type_trans

NAME

eth_type_trans - determine the packet's protocol ID.

SYNOPSIS

__be16 eth_type_trans(struct sk_buff * skb, struct net_device * dev);

ARGUMENTS

skb

: received socket data

dev

: receiving network device

DESCRIPTION

The rule here is that we assume 802.3 if the type field is short enough to be a length. This is normal practice and works for any 'now in use' protocol.