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Annotation of xinu/sys/mkarp.c, revision 1.1

1.1     ! root        1: /* mkarp.c - mkarp */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <network.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  *  mkarp  -  allocate and fill in an ARP or RARP packet
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: struct epacket *mkarp(typ, op, spaddr, tpaddr)
        !            12: short  typ;
        !            13: short  op;
        !            14: IPaddr spaddr;
        !            15: IPaddr tpaddr;
        !            16: {
        !            17:        register struct arppak  *apacptr;
        !            18:        struct  epacket *packet;
        !            19: 
        !            20:        packet = (struct epacket *) getbuf(Net.netpool);
        !            21:        if ( ((int) packet) == SYSERR)
        !            22:                return((struct epacket *) SYSERR);
        !            23:        blkcopy(packet->ep_hdr.e_dest, EBCAST, AR_HLEN);
        !            24:        packet->ep_hdr.e_ptype = hs2net(typ);
        !            25:        apacptr = (struct arppak *) packet->ep_data;
        !            26:        apacptr->ar_hrd = hs2net(AR_HRD);
        !            27:        apacptr->ar_prot = hs2net(AR_PROT);
        !            28:        apacptr->ar_hlen = AR_HLEN;
        !            29:        apacptr->ar_plen = AR_PLEN;
        !            30:        apacptr->ar_op = hs2net(op);
        !            31:        blkcopy(apacptr->ar_sha, eth[0].etpaddr, AR_HLEN);
        !            32:        blkcopy(apacptr->ar_spa, spaddr, AR_PLEN);
        !            33:        blkcopy(apacptr->ar_tha, eth[0].etpaddr, AR_HLEN);
        !            34:        blkcopy(apacptr->ar_tpa, tpaddr, AR_PLEN);
        !            35:        return(packet);
        !            36: }

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