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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: stable/9/sys/netatalk/ddp_output.c 194913 2009-06-24 21:36:09Z rwatson $ */
   25 
   26 #include <sys/param.h>
   27 #include <sys/systm.h>
   28 #include <sys/mbuf.h>
   29 #include <sys/socket.h>
   30 #include <sys/socketvar.h>
   31 
   32 #include <net/if.h>
   33 #include <net/route.h>
   34 
   35 #undef s_net
   36 
   37 #include <netatalk/at.h>
   38 #include <netatalk/at_var.h>
   39 #include <netatalk/ddp.h>
   40 #include <netatalk/ddp_var.h>
   41 #include <netatalk/at_extern.h>
   42 
   43 #include <security/mac/mac_framework.h>
   44 
   45 int     ddp_cksum = 1;
   46 
   47 int
   48 ddp_output(struct mbuf *m, struct socket *so)
   49 {
   50         struct ddpehdr  *deh;
   51         struct ddpcb *ddp = sotoddpcb(so);
   52 
   53 #ifdef MAC
   54         mac_socket_create_mbuf(so, m);
   55 #endif
   56 
   57         M_PREPEND(m, sizeof(struct ddpehdr), M_DONTWAIT);
   58         if (m == NULL)
   59         return (ENOBUFS);
   60 
   61         deh = mtod(m, struct ddpehdr *);
   62         deh->deh_pad = 0;
   63         deh->deh_hops = 0;
   64 
   65         deh->deh_len = m->m_pkthdr.len;
   66 
   67         deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
   68         deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
   69         deh->deh_dport = ddp->ddp_fsat.sat_port;
   70         deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
   71         deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
   72         deh->deh_sport = ddp->ddp_lsat.sat_port;
   73 
   74         /*
   75          * The checksum calculation is done after all of the other bytes have
   76          * been filled in.
   77          */
   78         if (ddp_cksum)
   79                 deh->deh_sum = at_cksum(m, sizeof(int));
   80         else
   81                 deh->deh_sum = 0;
   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;
  100                     data < end; data++) {
  101                         if (skip) {
  102                                 skip--;
  103                                 continue;
  104                         }
  105                         cksum = (cksum + *data) << 1;
  106                         if (cksum & 0x00010000)
  107                                 cksum++;
  108                         cksum &= 0x0000ffff;
  109                 }
  110         }
  111 
  112         if (cksum == 0)
  113                 cksum = 0x0000ffff;
  114         return ((u_short)cksum);
  115 }
  116 
  117 int
  118 ddp_route(struct mbuf *m, struct route *ro)
  119 {
  120         struct sockaddr_at      gate;
  121         struct elaphdr  *elh;
  122         struct mbuf             *m0;
  123         struct at_ifaddr        *aa = NULL;
  124         struct ifnet    *ifp = NULL;
  125         u_short         net;
  126 
  127 #if 0
  128         /* Check for net zero, node zero ("myself") */
  129         if (satosat(&ro->ro_dst)->sat_addr.s_net == ATADDR_ANYNET
  130             && satosat(&ro->ro_dst)->sat_addr.s_node == ATADDR_ANYNODE) {
  131                 /* Find the loopback interface */
  132         }
  133 #endif
  134 
  135         /*
  136          * If we have a route, find the ifa that refers to this route.  I.e
  137          * the ifa used to get to the gateway.
  138          */
  139         if ((ro->ro_rt == NULL) || (ro->ro_rt->rt_ifa == NULL) ||
  140             ((ifp = ro->ro_rt->rt_ifa->ifa_ifp) == NULL))
  141                 rtalloc(ro);
  142         if ((ro->ro_rt != NULL) && (ro->ro_rt->rt_ifa) &&
  143             (ifp = ro->ro_rt->rt_ifa->ifa_ifp)) {
  144                 net = ntohs(satosat(ro->ro_rt->rt_gateway)->sat_addr.s_net);
  145                 AT_IFADDR_RLOCK();
  146                 TAILQ_FOREACH(aa, &at_ifaddrhead, aa_link) {
  147                         if (((net == 0) || (aa->aa_ifp == ifp)) &&
  148                             net >= ntohs(aa->aa_firstnet) &&
  149                             net <= ntohs(aa->aa_lastnet))
  150                                 break;
  151                 }
  152                 if (aa != NULL)
  153                         ifa_ref(&aa->aa_ifa);
  154                 AT_IFADDR_RUNLOCK();
  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          * XXXRW: kern/4184 suggests that an m_pullup() of (m) should take
  196          * place here to address possible alignment issues.
  197          *
  198          * XXXRW: This appears not to handle M_PKTHDR properly, as it doesn't
  199          * move the existing header from the old packet to the new one.
  200          * Posibly should call M_MOVE_PKTHDR()?  This would also allow
  201          * removing mac_mbuf_copy().
  202          */
  203         if (!(aa->aa_flags & AFA_PHASE2)) {
  204                 MGET(m0, M_DONTWAIT, MT_DATA);
  205                 if (m0 == NULL) {
  206                         ifa_free(&aa->aa_ifa);
  207                         m_freem(m);
  208                         printf("ddp_route: no buffers\n");
  209                         return (ENOBUFS);
  210                 }
  211 #ifdef MAC
  212                 mac_mbuf_copy(m, m0);
  213 #endif
  214                 m0->m_next = m;
  215                 /* XXX perhaps we ought to align the header? */
  216                 m0->m_len = SZ_ELAPHDR;
  217                 m = m0;
  218 
  219                 elh = mtod(m, struct elaphdr *);
  220                 elh->el_snode = satosat(&aa->aa_addr)->sat_addr.s_node;
  221                 elh->el_type = ELAP_DDPEXTEND;
  222                 elh->el_dnode = gate.sat_addr.s_node;
  223         }
  224         ro->ro_rt->rt_use++;
  225 
  226 #ifdef NETATALK_DEBUG
  227         printf ("ddp_route: from %d.%d to %d.%d, via %d.%d (%s)\n",
  228             ntohs(satosat(&aa->aa_addr)->sat_addr.s_net),
  229             satosat(&aa->aa_addr)->sat_addr.s_node,
  230             ntohs(satosat(&ro->ro_dst)->sat_addr.s_net),
  231             satosat(&ro->ro_dst)->sat_addr.s_node,
  232             ntohs(gate.sat_addr.s_net), gate.sat_addr.s_node, ifp->if_xname);
  233 #endif
  234 
  235         /* Short-circuit the output if we're sending this to ourself. */
  236         if ((satosat(&aa->aa_addr)->sat_addr.s_net ==
  237             satosat(&ro->ro_dst)->sat_addr.s_net) &&
  238             (satosat(&aa->aa_addr)->sat_addr.s_node ==
  239             satosat(&ro->ro_dst)->sat_addr.s_node)) {
  240                 ifa_free(&aa->aa_ifa);
  241                 return (if_simloop(ifp, m, gate.sat_family, 0));
  242         }
  243         ifa_free(&aa->aa_ifa);
  244 
  245         /* XXX */
  246         return ((*ifp->if_output)(ifp, m, (struct sockaddr *)&gate, NULL));
  247 }

Cache object: a3efb7a9355038de8eb2ff8f536ea9be


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