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Annotation of qemu/roms/ipxe/src/net/eapol.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2009 Joshua Oreman <[email protected]>.
        !             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 <ipxe/netdevice.h>
        !            28: #include <ipxe/iobuf.h>
        !            29: #include <ipxe/if_ether.h>
        !            30: #include <ipxe/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_dest  Link-layer destination address
        !            40:  * @v ll_source        Link-layer source address
        !            41:  *
        !            42:  * This function takes ownership of the I/O buffer passed to it.
        !            43:  */
        !            44: static int eapol_rx ( struct io_buffer *iob, struct net_device *netdev,
        !            45:                      const void *ll_dest, const void *ll_source ) {
        !            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_dest, 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: };

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