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Annotation of embedaddon/dhcp/common/fddi.c, revision 1.1

1.1     ! misho       1: /* fddi.c
        !             2: 
        !             3:    Packet assembly code, originally contributed by Archie Cobbs. */
        !             4: 
        !             5: /*
        !             6:  * Copyright (c) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
        !             7:  * Copyright (c) 1996-2003 by Internet Software Consortium
        !             8:  *
        !             9:  * Permission to use, copy, modify, and distribute this software for any
        !            10:  * purpose with or without fee is hereby granted, provided that the above
        !            11:  * copyright notice and this permission notice appear in all copies.
        !            12:  *
        !            13:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
        !            14:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            15:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
        !            16:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            17:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            18:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
        !            19:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            20:  *
        !            21:  *   Internet Systems Consortium, Inc.
        !            22:  *   950 Charter Street
        !            23:  *   Redwood City, CA 94063
        !            24:  *   <info@isc.org>
        !            25:  *   https://www.isc.org/
        !            26:  *
        !            27:  * This software has been written for Internet Systems Consortium
        !            28:  * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
        !            29:  * To learn more about Internet Systems Consortium, see
        !            30:  * ``https://www.isc.org/''.  To learn more about Vixie Enterprises,
        !            31:  * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
        !            32:  * ``http://www.nominum.com''.
        !            33:  */
        !            34: 
        !            35: #include "dhcpd.h"
        !            36: 
        !            37: #if defined (DEC_FDDI)
        !            38: #include <netinet/if_fddi.h>
        !            39: #include <net/if_llc.h>
        !            40: 
        !            41: #if defined (PACKET_ASSEMBLY) || defined (PACKET_DECODING)
        !            42: #include "includes/netinet/if_ether.h"
        !            43: #endif /* PACKET_ASSEMBLY || PACKET_DECODING */
        !            44: 
        !            45: #if defined (PACKET_ASSEMBLY)
        !            46: /* Assemble an hardware header... */
        !            47: 
        !            48: void assemble_fddi_header (interface, buf, bufix, to)
        !            49:        struct interface_info *interface;
        !            50:        unsigned char *buf;
        !            51:        unsigned *bufix;
        !            52:        struct hardware *to;
        !            53: {
        !            54:        struct fddi_header   fh;
        !            55:        struct llc     lh;
        !            56: 
        !            57:        if (to && to -> hlen == 7)
        !            58:                memcpy (fh.fddi_dhost, &to -> hbuf [1],
        !            59:                        sizeof (fh.fddi_dhost));
        !            60:        memcpy (fh.fddi_shost,
        !            61:                &interface -> hw_address.hbuf [1], sizeof (fh.fddi_shost));
        !            62:        fh.fddi_fc = FDDIFC_LLC_ASYNC;
        !            63:        memcpy (&buf [*bufix], &fh, sizeof fh);
        !            64:        *bufix += sizeof fh;
        !            65: 
        !            66:        lh.llc_dsap = LLC_SNAP_LSAP;
        !            67:        lh.llc_ssap = LLC_SNAP_LSAP;
        !            68:        lh.llc_un.type_snap.control = LLC_UI;
        !            69:        lh.llc_un.type_snap.ether_type = htons (ETHERTYPE_IP);
        !            70:        memcpy (&buf [*bufix], &lh, LLC_SNAP_LEN);
        !            71:        *bufix += LLC_SNAP_LEN;
        !            72: }
        !            73: #endif /* PACKET_ASSEMBLY */
        !            74: 
        !            75: #ifdef PACKET_DECODING
        !            76: /* Decode a hardware header... */
        !            77: 
        !            78: ssize_t decode_fddi_header (interface, buf, bufix, from)
        !            79:      struct interface_info *interface;
        !            80:      unsigned char *buf;
        !            81:      unsigned bufix;
        !            82:      struct hardware *from;
        !            83: {
        !            84:        struct fddi_header   fh;
        !            85:        struct llc     lh;
        !            86:        
        !            87:        from -> hbuf [0] = HTYPE_FDDI;
        !            88:        memcpy (&from -> hbuf [1], fh.fddi_shost, sizeof fh.fddi_shost);
        !            89:        return FDDI_HEADER_SIZE + LLC_SNAP_LEN;
        !            90: }
        !            91: #endif /* PACKET_DECODING */
        !            92: #endif /* DEC_FDDI */