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 #include <sys/param.h>
   25 #include <sys/systm.h>
   26 #include <sys/mbuf.h>
   27 #include <sys/socket.h>
   28 #include <sys/socketvar.h>
   29 
   30 #include <net/if.h>
   31 #include <net/route.h>
   32 
   33 #undef s_net
   34 
   35 #include <netatalk/at.h>
   36 #include <netatalk/at_var.h>
   37 #include <netatalk/ddp.h>
   38 #include <netatalk/ddp_var.h>
   39 #include <netatalk/at_extern.h>
   40 
   41 int     ddp_cksum = 1;
   42 
   43 int
   44 ddp_output( struct mbuf *m, struct socket *so)
   45 {
   46     struct ddpehdr      *deh;
   47     struct ddpcb *ddp = sotoddpcb( so );
   48 
   49     M_PREPEND( m, sizeof( struct ddpehdr ), M_WAIT );
   50 
   51     deh = mtod( m, struct ddpehdr *);
   52     deh->deh_pad = 0;
   53     deh->deh_hops = 0;
   54 
   55     deh->deh_len = m->m_pkthdr.len;
   56 
   57     deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
   58     deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
   59     deh->deh_dport = ddp->ddp_fsat.sat_port;
   60     deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
   61     deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
   62     deh->deh_sport = ddp->ddp_lsat.sat_port;
   63 
   64     /*
   65      * The checksum calculation is done after all of the other bytes have
   66      * been filled in.
   67      */
   68     if ( ddp_cksum ) {
   69         deh->deh_sum = at_cksum( m, sizeof( int ));
   70     } else {
   71         deh->deh_sum = 0;
   72     }
   73     deh->deh_bytes = htonl( deh->deh_bytes );
   74 
   75 #ifdef NETATALK_DEBUG
   76     printf ("ddp_output: from %d.%d:%d to %d.%d:%d\n",
   77         ntohs(deh->deh_snet), deh->deh_snode, deh->deh_sport,
   78         ntohs(deh->deh_dnet), deh->deh_dnode, deh->deh_dport);
   79 #endif
   80     return( ddp_route( m, &ddp->ddp_route ));
   81 }
   82 
   83 u_short
   84 at_cksum( struct mbuf *m, int skip)
   85 {
   86     u_char      *data, *end;
   87     u_long      cksum = 0;
   88 
   89     for (; m; m = m->m_next ) {
   90         for ( data = mtod( m, u_char * ), end = data + m->m_len; data < end;
   91                 data++ ) {
   92             if ( skip ) {
   93                 skip--;
   94                 continue;
   95             }
   96             cksum = ( cksum + *data ) << 1;
   97             if ( cksum & 0x00010000 ) {
   98                 cksum++;
   99             }
  100             cksum &= 0x0000ffff;
  101         }
  102     }
  103 
  104     if ( cksum == 0 ) {
  105         cksum = 0x0000ffff;
  106     }
  107     return( (u_short)cksum );
  108 }
  109 
  110 int
  111 ddp_route( struct mbuf *m, struct route *ro)
  112 {
  113     struct sockaddr_at  gate;
  114     struct elaphdr      *elh;
  115     struct mbuf         *m0;
  116     struct at_ifaddr    *aa = NULL;
  117     struct ifnet        *ifp = NULL;
  118     u_short             net;
  119 
  120 #if 0
  121     /* Check for net zero, node zero ("myself") */
  122     if (satosat(&ro->ro_dst)->sat_addr.s_net == ATADDR_ANYNET
  123         && satosat(&ro->ro_dst)->sat_addr.s_node == ATADDR_ANYNODE) {
  124             /* Find the loopback interface */
  125     }
  126 #endif
  127 
  128     /*
  129      * if we have a route, find the ifa that refers to this route.
  130      * I.e The ifa used to get to the gateway.
  131      */
  132     if ( (ro->ro_rt == NULL)
  133     || ( ro->ro_rt->rt_ifa == NULL )
  134     || ( (ifp = ro->ro_rt->rt_ifa->ifa_ifp) == NULL )) {
  135         rtalloc(ro);
  136     }
  137     if ( (ro->ro_rt != NULL)
  138     && ( ro->ro_rt->rt_ifa )
  139     && ( ifp = ro->ro_rt->rt_ifa->ifa_ifp )) {
  140         net = ntohs(satosat(ro->ro_rt->rt_gateway)->sat_addr.s_net);
  141         for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
  142             if (((net == 0) || (aa->aa_ifp == ifp)) &&
  143                     net >= ntohs( aa->aa_firstnet ) &&
  144                     net <= ntohs( aa->aa_lastnet )) {
  145                 break;
  146             }
  147         }
  148     } else {
  149         m_freem( m );
  150 #ifdef NETATALK_DEBUG
  151         if (ro->ro_rt == NULL)
  152             printf ("ddp_route: no ro_rt.\n");
  153         else if (ro->ro_rt->rt_ifa == NULL)
  154             printf ("ddp_route: no ro_rt->rt_ifa\n");
  155         else
  156             printf ("ddp_route: no ro_rt->rt_ifa->ifa_ifp\n");
  157 #endif
  158         return( ENETUNREACH );
  159     }
  160 
  161     if ( aa == NULL ) {
  162 #ifdef NETATALK_DEBUG
  163         printf( "ddp_route: no atalk address found for %s%d\n", 
  164             ifp->if_name, ifp->if_unit);
  165 #endif
  166         m_freem( m );
  167         return( ENETUNREACH );
  168     }
  169 
  170     /*
  171      * if the destination address is on a directly attached node use that,
  172      * else use the official gateway.
  173      */
  174     if ( ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) >=
  175             ntohs( aa->aa_firstnet ) &&
  176             ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) <=
  177             ntohs( aa->aa_lastnet )) {
  178         gate = *satosat( &ro->ro_dst );
  179     } else {
  180         gate = *satosat( ro->ro_rt->rt_gateway );
  181     }
  182 
  183     /*
  184      * There are several places in the kernel where data is added to
  185      * an mbuf without ensuring that the mbuf pointer is aligned.
  186      * This is bad for transition routing, since phase 1 and phase 2
  187      * packets end up poorly aligned due to the three byte elap header.
  188      */
  189     if ( !(aa->aa_flags & AFA_PHASE2) ) {
  190         MGET( m0, M_WAIT, MT_HEADER );
  191         if ( m0 == 0 ) {
  192             m_freem( m );
  193             printf("ddp_route: no buffers\n");
  194             return( ENOBUFS );
  195         }
  196         m0->m_next = m;
  197         /* XXX perhaps we ought to align the header? */
  198         m0->m_len = SZ_ELAPHDR;
  199         m = m0;
  200 
  201         elh = mtod( m, struct elaphdr *);
  202         elh->el_snode = satosat( &aa->aa_addr )->sat_addr.s_node;
  203         elh->el_type = ELAP_DDPEXTEND;
  204         elh->el_dnode = gate.sat_addr.s_node;
  205     }
  206     ro->ro_rt->rt_use++;
  207 
  208 #ifdef NETATALK_DEBUG
  209     printf ("ddp_route: from %d.%d to %d.%d, via %d.%d (%s%d)\n",
  210         ntohs(satosat(&aa->aa_addr)->sat_addr.s_net),
  211         satosat(&aa->aa_addr)->sat_addr.s_node,
  212         ntohs(satosat(&ro->ro_dst)->sat_addr.s_net),
  213         satosat(&ro->ro_dst)->sat_addr.s_node,
  214         ntohs(gate.sat_addr.s_net),
  215         gate.sat_addr.s_node,
  216         ifp->if_name, ifp->if_unit);
  217 #endif
  218 
  219     /* short-circuit the output if we're sending this to ourself */
  220     if ((satosat(&aa->aa_addr)->sat_addr.s_net  == satosat(&ro->ro_dst)->sat_addr.s_net) &&
  221         (satosat(&aa->aa_addr)->sat_addr.s_node == satosat(&ro->ro_dst)->sat_addr.s_node))
  222     {
  223         return (if_simloop(ifp, m, (struct sockaddr *)&gate, 0));
  224     }
  225 
  226     return((*ifp->if_output)( ifp,
  227         m, (struct sockaddr *)&gate, NULL)); /* XXX */
  228 }

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

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