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

1.1     ! root        1: /* ipsend.c - ipsend */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <network.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  *  ipsend  -  fill in IP header and send datagram to specified address
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: ipsend(faddr, packet, datalen)
        !            12: IPaddr faddr;
        !            13: struct epacket *packet;
        !            14: int    datalen;
        !            15: {
        !            16:        register struct ip *ipptr;
        !            17: 
        !            18:        packet->ep_hdr.e_ptype = hs2net(EP_IP);
        !            19:        ipptr = (struct ip *) packet->ep_data;
        !            20:        ipptr->i_verlen = IVERLEN;
        !            21:        ipptr->i_svctyp = ISVCTYP;
        !            22:        ipptr->i_paclen = hs2net( datalen+IPHLEN );
        !            23:        ipptr->i_id = hs2net(ipackid++);
        !            24:        ipptr->i_fragoff = hs2net(IFRAGOFF);
        !            25:        ipptr->i_tim2liv = ITIM2LIV;
        !            26:        ipptr->i_cksum = 0;
        !            27:        getaddr(ipptr->i_src);
        !            28:        blkcopy(ipptr->i_dest, faddr, IPLEN);
        !            29:        ipptr->i_cksum = cksum(ipptr, IPHLEN>>1);
        !            30:        return( route(faddr, packet, EHLEN+IPHLEN+datalen) );
        !            31: }
        !            32: int    ipackid = 1;

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