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Annotation of Net2/netrmp/rmp.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 University of Utah.
                      3:  * Copyright (c) 1990 The Regents of the University of California.
                      4:  * All rights reserved.
                      5:  *
                      6:  * This code is derived from software contributed to Berkeley by
                      7:  * the Systems Programming Group of the University of Utah Computer
                      8:  * Science Department.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by the University of
                     21:  *     California, Berkeley and its contributors.
                     22:  * 4. Neither the name of the University nor the names of its contributors
                     23:  *    may be used to endorse or promote products derived from this software
                     24:  *    without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     36:  * SUCH DAMAGE.
                     37:  *
                     38:  * from: Utah $Hdr: rmp.c 1.3 89/06/07$
                     39:  *
                     40:  *     @(#)rmp.c       7.1 (Berkeley) 5/8/90
                     41:  */
                     42: 
                     43: #include "param.h"
                     44: #include "mbuf.h"
                     45: #include "socket.h"
                     46: #include "socketvar.h"
                     47: 
                     48: #include "../net/if.h"
                     49: #include "../net/route.h"
                     50: #include "../net/raw_cb.h"
                     51: 
                     52: #include "../netrmp/rmp.h"
                     53: #include "../netrmp/rmp_var.h"
                     54: 
                     55: /*
                     56: **  rmp_output: route packet to proper network interface.
                     57: */
                     58: 
                     59: rmp_output(m, so)
                     60: struct mbuf *m;
                     61: struct socket *so;
                     62: {
                     63:        struct ifnet *ifp;
                     64:        struct rawcb *rp = sotorawcb(so);
                     65:        struct rmp_packet *rmp;
                     66: 
                     67:        /*
                     68:         *  Convert the mbuf back to an RMP packet so we can get the
                     69:         *  address of the "ifnet struct" specifying the interface it
                     70:         *  should go out on.
                     71:         */
                     72:        rmp = mtod(m, struct rmp_packet *);
                     73:        ifp = rmp->ifp;
                     74: 
                     75:        /*
                     76:         *  Strip off the "ifnet struct ptr" from the packet leaving
                     77:         *  us with a complete IEEE 802.2 packet.
                     78:         */
                     79:        m_adj(m, sizeof(struct ifnet *));
                     80: 
                     81:        /*
                     82:         *  Send the packet.
                     83:         */
                     84:        return ((*ifp->if_output) (ifp, m, &rp->rcb_faddr));
                     85: }

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