src/net/eapol.c

   1 /*
   2  * Copyright (c) 2009 Joshua Oreman <oremanj@rwcr.net>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 /** @file
  22  *
  23  * 802.1X Extensible Authentication Protocol over LANs demultiplexer
  24  *
  25  */
  26
  27 #include <gpxe/netdevice.h>
  28 #include <gpxe/iobuf.h>
  29 #include <gpxe/if_ether.h>
  30 #include <gpxe/eapol.h>
  31 #include <errno.h>
  32 #include <byteswap.h>
  33
  34 /**
  35  * Receive EAPOL network-layer packet
  36  *
  37  * @v iob       I/O buffer
  38  * @v netdev    Network device
  39  * @v ll_source Link-layer source address
  40  *
  41  * This function takes ownership of the I/O buffer passed to it.
  42  */
  43 static int eapol_rx ( struct io_buffer *iob, struct net_device *netdev,
  44                       const void *ll_source )
  45 {
  46         struct eapol_frame *eapol = iob->data;
  47         struct eapol_handler *handler;
  48
  49         if ( iob_len ( iob ) < EAPOL_HDR_LEN ) {
  50                 free_iob ( iob );
  51                 return -EINVAL;
  52         }
  53
  54         for_each_table_entry ( handler, EAPOL_HANDLERS ) {
  55                 if ( handler->type == eapol->type ) {
  56                         iob_pull ( iob, EAPOL_HDR_LEN );
  57                         return handler->rx ( iob, netdev, ll_source );
  58                 }
  59         }
  60
  61         free_iob ( iob );
  62         return -( ENOTSUP | ( ( eapol->type & 0x1f ) << 8 ) );
  63 }
  64
  65 /**
  66  * Transcribe EAPOL network-layer address
  67  *
  68  * @v net_addr  Network-layer address
  69  * @ret str     String representation of network-layer address
  70  *
  71  * EAPOL doesn't have network-layer addresses, so we just return the
  72  * string @c "<EAPOL>".
  73  */
  74 static const char * eapol_ntoa ( const void *net_addr __unused )
  75 {
  76         return "<EAPOL>";
  77 }
  78
  79 /** EAPOL network protocol */
  80 struct net_protocol eapol_protocol __net_protocol = {
  81         .name = "EAPOL",
  82         .rx = eapol_rx,
  83         .ntoa = eapol_ntoa,
  84         .net_proto = htons ( ETH_P_EAPOL ),
  85 };