The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netatalk/ddp_output.c

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    1 /*
    2  * Copyright (c) 1990,1991 Regents of The University of Michigan.
    3  * All Rights Reserved.
    4  *
    5  * Permission to use, copy, modify, and distribute this software and
    6  * its documentation for any purpose and without fee is hereby granted,
    7  * provided that the above copyright notice appears in all copies and
    8  * that both that copyright notice and this permission notice appear
    9  * in supporting documentation, and that the name of The University
   10  * of Michigan not be used in advertising or publicity pertaining to
   11  * distribution of the software without specific, written prior
   12  * permission. This software is supplied as is without expressed or
   13  * implied warranties of any kind.
   14  *
   15  *      Research Systems Unix Group
   16  *      The University of Michigan
   17  *      c/o Mike Clark
   18  *      535 W. William Street
   19  *      Ann Arbor, Michigan
   20  *      +1-313-763-0525
   21  *      netatalk@itd.umich.edu
   22  */
   23 
   24 /* $FreeBSD: src/sys/netatalk/ddp_output.c,v 1.18 2003/02/19 05:47:30 imp Exp $ */
   25 
   26 #include "opt_mac.h"
   27 
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/mac.h>
   31 #include <sys/mbuf.h>
   32 #include <sys/socket.h>
   33 #include <sys/socketvar.h>
   34 
   35 #include <net/if.h>
   36 #include <net/route.h>
   37 
   38 #undef s_net
   39 
   40 #include <netatalk/at.h>
   41 #include <netatalk/at_var.h>
   42 #include <netatalk/ddp.h>
   43 #include <netatalk/ddp_var.h>
   44 #include <netatalk/at_extern.h>
   45 
   46 int     ddp_cksum = 1;
   47 
   48 int
   49 ddp_output( struct mbuf *m, struct socket *so)
   50 {
   51     struct ddpehdr      *deh;
   52     struct ddpcb *ddp = sotoddpcb( so );
   53 
   54 #ifdef MAC
   55     mac_create_mbuf_from_socket(so, m);
   56 #endif
   57 
   58     M_PREPEND( m, sizeof( struct ddpehdr ), M_TRYWAIT );
   59 
   60     deh = mtod( m, struct ddpehdr *);
   61     deh->deh_pad = 0;
   62     deh->deh_hops = 0;
   63 
   64     deh->deh_len = m->m_pkthdr.len;
   65 
   66     deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
   67     deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
   68     deh->deh_dport = ddp->ddp_fsat.sat_port;
   69     deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
   70     deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
   71     deh->deh_sport = ddp->ddp_lsat.sat_port;
   72 
   73     /*
   74      * The checksum calculation is done after all of the other bytes have
   75      * been filled in.
   76      */
   77     if ( ddp_cksum ) {
   78         deh->deh_sum = at_cksum( m, sizeof( int ));
   79     } else {
   80         deh->deh_sum = 0;
   81     }
   82     deh->deh_bytes = htonl( deh->deh_bytes );
   83 
   84 #ifdef NETATALK_DEBUG
   85     printf ("ddp_output: from %d.%d:%d to %d.%d:%d\n",
   86         ntohs(deh->deh_snet), deh->deh_snode, deh->deh_sport,
   87         ntohs(deh->deh_dnet), deh->deh_dnode, deh->deh_dport);
   88 #endif
   89     return( ddp_route( m, &ddp->ddp_route ));
   90 }
   91 
   92 u_short
   93 at_cksum( struct mbuf *m, int skip)
   94 {
   95     u_char      *data, *end;
   96     u_long      cksum = 0;
   97 
   98     for (; m; m = m->m_next ) {
   99         for ( data = mtod( m, u_char * ), end = data + m->m_len; data < end;
  100                 data++ ) {
  101             if ( skip ) {
  102                 skip--;
  103                 continue;
  104             }
  105             cksum = ( cksum + *data ) << 1;
  106             if ( cksum & 0x00010000 ) {
  107                 cksum++;
  108             }
  109             cksum &= 0x0000ffff;
  110         }
  111     }
  112 
  113     if ( cksum == 0 ) {
  114         cksum = 0x0000ffff;
  115     }
  116     return( (u_short)cksum );
  117 }
  118 
  119 int
  120 ddp_route( struct mbuf *m, struct route *ro)
  121 {
  122     struct sockaddr_at  gate;
  123     struct elaphdr      *elh;
  124     struct mbuf         *m0;
  125     struct at_ifaddr    *aa = NULL;
  126     struct ifnet        *ifp = NULL;
  127     u_short             net;
  128 
  129 #if 0
  130     /* Check for net zero, node zero ("myself") */
  131     if (satosat(&ro->ro_dst)->sat_addr.s_net == ATADDR_ANYNET
  132         && satosat(&ro->ro_dst)->sat_addr.s_node == ATADDR_ANYNODE) {
  133             /* Find the loopback interface */
  134     }
  135 #endif
  136 
  137     /*
  138      * if we have a route, find the ifa that refers to this route.
  139      * I.e The ifa used to get to the gateway.
  140      */
  141     if ( (ro->ro_rt == NULL)
  142     || ( ro->ro_rt->rt_ifa == NULL )
  143     || ( (ifp = ro->ro_rt->rt_ifa->ifa_ifp) == NULL )) {
  144         rtalloc(ro);
  145     }
  146     if ( (ro->ro_rt != NULL)
  147     && ( ro->ro_rt->rt_ifa )
  148     && ( ifp = ro->ro_rt->rt_ifa->ifa_ifp )) {
  149         net = ntohs(satosat(ro->ro_rt->rt_gateway)->sat_addr.s_net);
  150         for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
  151             if (((net == 0) || (aa->aa_ifp == ifp)) &&
  152                     net >= ntohs( aa->aa_firstnet ) &&
  153                     net <= ntohs( aa->aa_lastnet )) {
  154                 break;
  155             }
  156         }
  157     } else {
  158         m_freem( m );
  159 #ifdef NETATALK_DEBUG
  160         if (ro->ro_rt == NULL)
  161             printf ("ddp_route: no ro_rt.\n");
  162         else if (ro->ro_rt->rt_ifa == NULL)
  163             printf ("ddp_route: no ro_rt->rt_ifa\n");
  164         else
  165             printf ("ddp_route: no ro_rt->rt_ifa->ifa_ifp\n");
  166 #endif
  167         return( ENETUNREACH );
  168     }
  169 
  170     if ( aa == NULL ) {
  171 #ifdef NETATALK_DEBUG
  172         printf( "ddp_route: no atalk address found for %s%d\n", 
  173             ifp->if_name, ifp->if_unit);
  174 #endif
  175         m_freem( m );
  176         return( ENETUNREACH );
  177     }
  178 
  179     /*
  180      * if the destination address is on a directly attached node use that,
  181      * else use the official gateway.
  182      */
  183     if ( ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) >=
  184             ntohs( aa->aa_firstnet ) &&
  185             ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) <=
  186             ntohs( aa->aa_lastnet )) {
  187         gate = *satosat( &ro->ro_dst );
  188     } else {
  189         gate = *satosat( ro->ro_rt->rt_gateway );
  190     }
  191 
  192     /*
  193      * There are several places in the kernel where data is added to
  194      * an mbuf without ensuring that the mbuf pointer is aligned.
  195      * This is bad for transition routing, since phase 1 and phase 2
  196      * packets end up poorly aligned due to the three byte elap header.
  197      */
  198     if ( !(aa->aa_flags & AFA_PHASE2) ) {
  199         MGET( m0, M_TRYWAIT, MT_HEADER );
  200         if ( m0 == 0 ) {
  201             m_freem( m );
  202             printf("ddp_route: no buffers\n");
  203             return( ENOBUFS );
  204         }
  205 #ifdef MAC
  206         mac_create_mbuf_from_mbuf(m, m0);
  207 #endif
  208         m0->m_next = m;
  209         /* XXX perhaps we ought to align the header? */
  210         m0->m_len = SZ_ELAPHDR;
  211         m = m0;
  212 
  213         elh = mtod( m, struct elaphdr *);
  214         elh->el_snode = satosat( &aa->aa_addr )->sat_addr.s_node;
  215         elh->el_type = ELAP_DDPEXTEND;
  216         elh->el_dnode = gate.sat_addr.s_node;
  217     }
  218     ro->ro_rt->rt_use++;
  219 
  220 #ifdef NETATALK_DEBUG
  221     printf ("ddp_route: from %d.%d to %d.%d, via %d.%d (%s%d)\n",
  222         ntohs(satosat(&aa->aa_addr)->sat_addr.s_net),
  223         satosat(&aa->aa_addr)->sat_addr.s_node,
  224         ntohs(satosat(&ro->ro_dst)->sat_addr.s_net),
  225         satosat(&ro->ro_dst)->sat_addr.s_node,
  226         ntohs(gate.sat_addr.s_net),
  227         gate.sat_addr.s_node,
  228         ifp->if_name, ifp->if_unit);
  229 #endif
  230 
  231     /* short-circuit the output if we're sending this to ourself */
  232     if ((satosat(&aa->aa_addr)->sat_addr.s_net  == satosat(&ro->ro_dst)->sat_addr.s_net) &&
  233         (satosat(&aa->aa_addr)->sat_addr.s_node == satosat(&ro->ro_dst)->sat_addr.s_node))
  234     {
  235         return (if_simloop(ifp, m, gate.sat_family, 0));
  236     }
  237 
  238     return((*ifp->if_output)( ifp,
  239         m, (struct sockaddr *)&gate, NULL)); /* XXX */
  240 }

Cache object: 40878a944d70685abf4387286c650225


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