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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*      $NetBSD: ddp_output.c,v 1.10 2006/10/07 15:49:00 rpaulo 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 1.10 2006/10/07 15:49:00 rpaulo 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         }
   93         deh->deh_bytes = htonl(deh->deh_bytes);
   94 
   95         return (ddp_route(m, &ddp->ddp_route));
   96 }
   97 
   98 u_short
   99 at_cksum(m, skip)
  100         struct mbuf *m;
  101         int skip;
  102 {
  103         u_char         *data, *end;
  104         u_long          cksum = 0;
  105 
  106         for (; m; m = m->m_next) {
  107                 for (data = mtod(m, u_char *), end = data + m->m_len;
  108                     data < end; data++) {
  109                         if (skip) {
  110                                 skip--;
  111                                 continue;
  112                         }
  113                         cksum = (cksum + *data) << 1;
  114                         if (cksum & 0x00010000) {
  115                                 cksum++;
  116                         }
  117                         cksum &= 0x0000ffff;
  118                 }
  119         }
  120 
  121         if (cksum == 0) {
  122                 cksum = 0x0000ffff;
  123         }
  124         return ((u_short) cksum);
  125 }
  126 
  127 int
  128 ddp_route(m, ro)
  129         struct mbuf *m;
  130         struct route *ro;
  131 {
  132         struct sockaddr_at gate;
  133         struct elaphdr *elh;
  134         struct at_ifaddr *aa = NULL;
  135         struct ifnet   *ifp = NULL;
  136         u_short         net;
  137 
  138         if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) {
  139                 net = satosat(ro->ro_rt->rt_gateway)->sat_addr.s_net;
  140                 for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
  141                         if (aa->aa_ifp == ifp &&
  142                             ntohs(net) >= ntohs(aa->aa_firstnet) &&
  143                             ntohs(net) <= ntohs(aa->aa_lastnet)) {
  144                                 break;
  145                         }
  146                 }
  147         }
  148         if (aa == NULL) {
  149                 printf("ddp_route: no address found\n");
  150                 m_freem(m);
  151                 return (EINVAL);
  152         }
  153         /*
  154          * There are several places in the kernel where data is added to
  155          * an mbuf without ensuring that the mbuf pointer is aligned.
  156          * This is bad for transition routing, since phase 1 and phase 2
  157          * packets end up poorly aligned due to the three byte elap header.
  158          */
  159         if (!(aa->aa_flags & AFA_PHASE2)) {
  160                 M_PREPEND(m, SZ_ELAPHDR, M_DONTWAIT);
  161                 if (!m)
  162                         return (ENOBUFS);
  163 
  164                 elh = mtod(m, struct elaphdr *);
  165                 elh->el_snode = satosat(&aa->aa_addr)->sat_addr.s_node;
  166                 elh->el_type = ELAP_DDPEXTEND;
  167                 if (ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) >=
  168                     ntohs(aa->aa_firstnet) &&
  169                     ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) <=
  170                     ntohs(aa->aa_lastnet)) {
  171                         elh->el_dnode = satosat(&ro->ro_dst)->sat_addr.s_node;
  172                 } else {
  173                         elh->el_dnode =
  174                             satosat(ro->ro_rt->rt_gateway)->sat_addr.s_node;
  175                 }
  176         }
  177         if (ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) >=
  178             ntohs(aa->aa_firstnet) &&
  179             ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) <=
  180             ntohs(aa->aa_lastnet)) {
  181                 gate = *satosat(&ro->ro_dst);
  182         } else {
  183                 gate = *satosat(ro->ro_rt->rt_gateway);
  184         }
  185         ro->ro_rt->rt_use++;
  186 
  187 #if IFA_STATS
  188         aa->aa_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len;
  189 #endif
  190 
  191         /* XXX */
  192         return ((*ifp->if_output) (ifp, m, (struct sockaddr *) &gate, NULL));
  193 }

Cache object: 201b7221eb2235b0360a5622489d6b16


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.