ddp_output.c

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    1 /*      $NetBSD: ddp_output.c,v 1.14 2008/04/06 18:46:56 dyoung Exp $    */
    2 
    3 /*
    4  * Copyright (c) 1990,1991 Regents of The University of Michigan.
    5  * All Rights Reserved.
    6  *
    7  * Permission to use, copy, modify, and distribute this software and
    8  * its documentation for any purpose and without fee is hereby granted,
    9  * provided that the above copyright notice appears in all copies and
   10  * that both that copyright notice and this permission notice appear
   11  * in supporting documentation, and that the name of The University
   12  * of Michigan not be used in advertising or publicity pertaining to
   13  * distribution of the software without specific, written prior
   14  * permission. This software is supplied as is without expressed or
   15  * implied warranties of any kind.
   16  *
   17  * This product includes software developed by the University of
   18  * California, Berkeley and its contributors.
   19  *
   20  *      Research Systems Unix Group
   21  *      The University of Michigan
   22  *      c/o Wesley Craig
   23  *      535 W. William Street
   24  *      Ann Arbor, Michigan
   25  *      +1-313-764-2278
   26  *      netatalk@umich.edu
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __KERNEL_RCSID(0, "$NetBSD: ddp_output.c,v 1.14 2008/04/06 18:46:56 dyoung Exp $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/mbuf.h>
   35 #include <sys/socket.h>
   36 #include <sys/errno.h>
   37 #include <sys/syslog.h>
   38 
   39 #include <net/if.h>
   40 #include <net/route.h>
   41 #include <net/if_ether.h>
   42 
   43 #include <netinet/in.h>
   44 #undef s_net
   45 
   46 #include <netatalk/at.h>
   47 #include <netatalk/at_var.h>
   48 #include <netatalk/ddp.h>
   49 #include <netatalk/ddp_var.h>
   50 #include <netatalk/at_extern.h>
   51 
   52 #include <machine/stdarg.h>
   53 
   54 int ddp_cksum = 1;
   55 
   56 int
   57 ddp_output(struct mbuf *m,...)
   58 {
   59         struct ddpcb   *ddp;
   60         struct ddpehdr *deh;
   61         va_list         ap;
   62 
   63         va_start(ap, m);
   64         ddp = va_arg(ap, struct ddpcb *);
   65         va_end(ap);
   66 
   67         M_PREPEND(m, sizeof(struct ddpehdr), M_DONTWAIT);
   68         if (!m)
   69                 return (ENOBUFS);
   70 
   71         deh = mtod(m, struct ddpehdr *);
   72         deh->deh_pad = 0;
   73         deh->deh_hops = 0;
   74 
   75         deh->deh_len = m->m_pkthdr.len;
   76 
   77         deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
   78         deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
   79         deh->deh_dport = ddp->ddp_fsat.sat_port;
   80         deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
   81         deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
   82         deh->deh_sport = ddp->ddp_lsat.sat_port;
   83 
   84         /*
   85          * The checksum calculation is done after all of the other bytes have
   86          * been filled in.
   87          */
   88         if (ddp_cksum)
   89                 deh->deh_sum = at_cksum(m, sizeof(int));
   90         else
   91                 deh->deh_sum = 0;
   92         deh->deh_bytes = htonl(deh->deh_bytes);
   93 
   94         return ddp_route(m, &ddp->ddp_route);
   95 }
   96 
   97 u_short
   98 at_cksum(struct mbuf *m, int skip)
   99 {
  100         u_char         *data, *end;
  101         u_long          cksum = 0;
  102 
  103         for (; m; m = m->m_next) {
  104                 for (data = mtod(m, u_char *), end = data + m->m_len;
  105                     data < end; data++) {
  106                         if (skip) {
  107                                 skip--;
  108                                 continue;
  109                         }
  110                         cksum = (cksum + *data) << 1;
  111                         if (cksum & 0x00010000)
  112                                 cksum++;
  113                         cksum &= 0x0000ffff;
  114                 }
  115         }
  116 
  117         if (cksum == 0) {
  118                 cksum = 0x0000ffff;
  119         }
  120         return (u_short)cksum;
  121 }
  122 
  123 int
  124 ddp_route(struct mbuf *m, struct route *ro)
  125 {
  126         struct rtentry *rt;
  127         struct sockaddr_at gate;
  128         struct elaphdr *elh;
  129         struct at_ifaddr *aa = NULL;
  130         struct ifnet   *ifp = NULL;
  131         u_short         net;
  132 
  133         if ((rt = rtcache_validate(ro)) != NULL && (ifp = rt->rt_ifp) != NULL) {
  134                 net = satosat(rt->rt_gateway)->sat_addr.s_net;
  135                 TAILQ_FOREACH(aa, &at_ifaddr, aa_list) {
  136                         if (aa->aa_ifp == ifp &&
  137                             ntohs(net) >= ntohs(aa->aa_firstnet) &&
  138                             ntohs(net) <= ntohs(aa->aa_lastnet)) {
  139                                 break;
  140                         }
  141                 }
  142         }
  143         if (aa == NULL) {
  144                 printf("%s: no address found\n", __func__);
  145                 m_freem(m);
  146                 return EINVAL;
  147         }
  148         /*
  149          * There are several places in the kernel where data is added to
  150          * an mbuf without ensuring that the mbuf pointer is aligned.
  151          * This is bad for transition routing, since phase 1 and phase 2
  152          * packets end up poorly aligned due to the three byte elap header.
  153          */
  154         if (!(aa->aa_flags & AFA_PHASE2)) {
  155                 M_PREPEND(m, SZ_ELAPHDR, M_DONTWAIT);
  156                 if (m == NULL)
  157                         return ENOBUFS;
  158 
  159                 elh = mtod(m, struct elaphdr *);
  160                 elh->el_snode = satosat(&aa->aa_addr)->sat_addr.s_node;
  161                 elh->el_type = ELAP_DDPEXTEND;
  162                 if (ntohs(satocsat(rtcache_getdst(ro))->sat_addr.s_net) >=
  163                     ntohs(aa->aa_firstnet) &&
  164                     ntohs(satocsat(rtcache_getdst(ro))->sat_addr.s_net) <=
  165                     ntohs(aa->aa_lastnet)) {
  166                         elh->el_dnode = satocsat(rtcache_getdst(ro))->sat_addr.s_node;
  167                 } else {
  168                         elh->el_dnode =
  169                             satosat(rt->rt_gateway)->sat_addr.s_node;
  170                 }
  171         }
  172         if (ntohs(satocsat(rtcache_getdst(ro))->sat_addr.s_net) >=
  173             ntohs(aa->aa_firstnet) &&
  174             ntohs(satocsat(rtcache_getdst(ro))->sat_addr.s_net) <=
  175             ntohs(aa->aa_lastnet)) {
  176                 gate = *satocsat(rtcache_getdst(ro));
  177         } else {
  178                 gate = *satosat(rt->rt_gateway);
  179         }
  180         rt->rt_use++;
  181 
  182 #if IFA_STATS
  183         aa->aa_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len;
  184 #endif
  185 
  186         /* XXX */
  187         return (*ifp->if_output)(ifp, m, (struct sockaddr *)&gate, NULL);
  188 }

Cache object: 3f56dbe3baf747fac1dc4ccad2804d23

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

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