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 /* $FreeBSD$ */
   25 
   26 #include "opt_mac.h"
   27 
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/mbuf.h>
   31 #include <sys/socket.h>
   32 #include <sys/socketvar.h>
   33 
   34 #include <net/if.h>
   35 #include <net/route.h>
   36 
   37 #undef s_net
   38 
   39 #include <netatalk/at.h>
   40 #include <netatalk/at_var.h>
   41 #include <netatalk/ddp.h>
   42 #include <netatalk/ddp_var.h>
   43 #include <netatalk/at_extern.h>
   44 
   45 #include <security/mac/mac_framework.h>
   46 
   47 int     ddp_cksum = 1;
   48 
   49 int
   50 ddp_output(struct mbuf *m, struct socket *so)
   51 {
   52         struct ddpehdr  *deh;
   53         struct ddpcb *ddp = sotoddpcb(so);
   54 
   55 #ifdef MAC
   56         SOCK_LOCK(so);
   57         mac_create_mbuf_from_socket(so, m);
   58         SOCK_UNLOCK(so);
   59 #endif
   60 
   61         M_PREPEND(m, sizeof(struct ddpehdr), M_DONTWAIT);
   62         if (m == NULL)
   63         return (ENOBUFS);
   64 
   65         deh = mtod(m, struct ddpehdr *);
   66         deh->deh_pad = 0;
   67         deh->deh_hops = 0;
   68 
   69         deh->deh_len = m->m_pkthdr.len;
   70 
   71         deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
   72         deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
   73         deh->deh_dport = ddp->ddp_fsat.sat_port;
   74         deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
   75         deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
   76         deh->deh_sport = ddp->ddp_lsat.sat_port;
   77 
   78         /*
   79          * The checksum calculation is done after all of the other bytes have
   80          * been filled in.
   81          */
   82         if (ddp_cksum)
   83                 deh->deh_sum = at_cksum(m, sizeof(int));
   84         else
   85                 deh->deh_sum = 0;
   86         deh->deh_bytes = htonl(deh->deh_bytes);
   87 
   88 #ifdef NETATALK_DEBUG
   89         printf ("ddp_output: from %d.%d:%d to %d.%d:%d\n",
   90         ntohs(deh->deh_snet), deh->deh_snode, deh->deh_sport,
   91         ntohs(deh->deh_dnet), deh->deh_dnode, deh->deh_dport);
   92 #endif
   93         return (ddp_route(m, &ddp->ddp_route));
   94 }
   95 
   96 u_short
   97 at_cksum(struct mbuf *m, int skip)
   98 {
   99         u_char  *data, *end;
  100         u_long  cksum = 0;
  101 
  102         for (; m; m = m->m_next) {
  103                 for (data = mtod(m, u_char *), end = data + m->m_len;
  104                     data < end; data++) {
  105                         if (skip) {
  106                                 skip--;
  107                                 continue;
  108                         }
  109                         cksum = (cksum + *data) << 1;
  110                         if (cksum & 0x00010000)
  111                                 cksum++;
  112                         cksum &= 0x0000ffff;
  113                 }
  114         }
  115 
  116         if (cksum == 0)
  117                 cksum = 0x0000ffff;
  118         return ((u_short)cksum);
  119 }
  120 
  121 int
  122 ddp_route(struct mbuf *m, struct route *ro)
  123 {
  124         struct sockaddr_at      gate;
  125         struct elaphdr  *elh;
  126         struct mbuf             *m0;
  127         struct at_ifaddr        *aa = NULL;
  128         struct ifnet    *ifp = NULL;
  129         u_short         net;
  130 
  131 #if 0
  132         /* Check for net zero, node zero ("myself") */
  133         if (satosat(&ro->ro_dst)->sat_addr.s_net == ATADDR_ANYNET
  134             && satosat(&ro->ro_dst)->sat_addr.s_node == ATADDR_ANYNODE) {
  135                 /* Find the loopback interface */
  136         }
  137 #endif
  138 
  139         /*
  140          * If we have a route, find the ifa that refers to this route.  I.e
  141          * the ifa used to get to the gateway.
  142          */
  143         if ((ro->ro_rt == NULL) || (ro->ro_rt->rt_ifa == NULL) ||
  144             ((ifp = ro->ro_rt->rt_ifa->ifa_ifp) == NULL))
  145                 rtalloc(ro);
  146         if ((ro->ro_rt != NULL) && (ro->ro_rt->rt_ifa) &&
  147             (ifp = ro->ro_rt->rt_ifa->ifa_ifp)) {
  148                 net = ntohs(satosat(ro->ro_rt->rt_gateway)->sat_addr.s_net);
  149                 for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) {
  150                         if (((net == 0) || (aa->aa_ifp == ifp)) &&
  151                             net >= ntohs(aa->aa_firstnet) &&
  152                             net <= ntohs(aa->aa_lastnet))
  153                                 break;
  154                 }
  155         } else {
  156                 m_freem(m);
  157 #ifdef NETATALK_DEBUG
  158                 if (ro->ro_rt == NULL)
  159                         printf ("ddp_route: no ro_rt.\n");
  160                 else if (ro->ro_rt->rt_ifa == NULL)
  161                         printf ("ddp_route: no ro_rt->rt_ifa\n");
  162                 else
  163                         printf ("ddp_route: no ro_rt->rt_ifa->ifa_ifp\n");
  164 #endif
  165                 return (ENETUNREACH);
  166         }
  167 
  168         if (aa == NULL) {
  169 #ifdef NETATALK_DEBUG
  170                 printf("ddp_route: no atalk address found for %s\n",
  171                     ifp->if_xname);
  172 #endif
  173                 m_freem(m);
  174                 return (ENETUNREACH);
  175         }
  176 
  177         /*
  178          * If the destination address is on a directly attached node use
  179          * that, else use the official gateway.
  180          */
  181         if (ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) >=
  182             ntohs(aa->aa_firstnet) &&
  183             ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) <=
  184             ntohs(aa->aa_lastnet))
  185                 gate = *satosat(&ro->ro_dst);
  186         else
  187                 gate = *satosat(ro->ro_rt->rt_gateway);
  188 
  189         /*
  190          * There are several places in the kernel where data is added to an
  191          * mbuf without ensuring that the mbuf pointer is aligned.  This is
  192          * bad for transition routing, since phase 1 and phase 2 packets end
  193          * up poorly aligned due to the three byte elap header.
  194          */
  195         if (!(aa->aa_flags & AFA_PHASE2)) {
  196                 MGET(m0, M_DONTWAIT, MT_DATA);
  197                 if (m0 == NULL) {
  198                         m_freem(m);
  199                         printf("ddp_route: no buffers\n");
  200                         return (ENOBUFS);
  201                 }
  202 #ifdef MAC
  203                 mac_copy_mbuf(m, m0);
  204 #endif
  205                 m0->m_next = m;
  206                 /* XXX perhaps we ought to align the header? */
  207                 m0->m_len = SZ_ELAPHDR;
  208                 m = m0;
  209 
  210                 elh = mtod(m, struct elaphdr *);
  211                 elh->el_snode = satosat(&aa->aa_addr)->sat_addr.s_node;
  212                 elh->el_type = ELAP_DDPEXTEND;
  213                 elh->el_dnode = gate.sat_addr.s_node;
  214         }
  215         ro->ro_rt->rt_use++;
  216 
  217 #ifdef NETATALK_DEBUG
  218         printf ("ddp_route: from %d.%d to %d.%d, via %d.%d (%s)\n",
  219             ntohs(satosat(&aa->aa_addr)->sat_addr.s_net),
  220             satosat(&aa->aa_addr)->sat_addr.s_node,
  221             ntohs(satosat(&ro->ro_dst)->sat_addr.s_net),
  222             satosat(&ro->ro_dst)->sat_addr.s_node,
  223             ntohs(gate.sat_addr.s_net), gate.sat_addr.s_node, ifp->if_xname);
  224 #endif
  225 
  226         /* Short-circuit the output if we're sending this to ourself. */
  227         if ((satosat(&aa->aa_addr)->sat_addr.s_net ==
  228             satosat(&ro->ro_dst)->sat_addr.s_net) &&
  229             (satosat(&aa->aa_addr)->sat_addr.s_node ==
  230             satosat(&ro->ro_dst)->sat_addr.s_node))
  231                 return (if_simloop(ifp, m, gate.sat_family, 0));
  232 
  233         /* XXX */
  234         return ((*ifp->if_output)(ifp, m, (struct sockaddr *)&gate, NULL));
  235 }

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

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