ddp_output.c

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    1 /*      $NetBSD: ddp_output.c,v 1.21 2018/02/17 19:10:18 rjs 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 1.21 2018/02/17 19:10:18 rjs Exp $");
   31 #include "opt_atalk.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/mbuf.h>
   36 #include <sys/socket.h>
   37 #include <sys/errno.h>
   38 #include <sys/syslog.h>
   39 
   40 #include <net/if.h>
   41 #include <net/route.h>
   42 #include <net/if_ether.h>
   43 
   44 #include <netinet/in.h>
   45 #undef s_net
   46 
   47 #include <netatalk/at.h>
   48 #include <netatalk/at_var.h>
   49 #include <netatalk/ddp.h>
   50 #include <netatalk/ddp_var.h>
   51 #include <netatalk/at_extern.h>
   52 
   53 int ddp_cksum = 1;
   54 
   55 int
   56 ddp_output(struct mbuf *m, struct ddpcb *ddp)
   57 {
   58         struct ddpehdr *deh;
   59 
   60         M_PREPEND(m, sizeof(struct ddpehdr), M_DONTWAIT);
   61         if (!m)
   62                 return (ENOBUFS);
   63 
   64         deh = mtod(m, struct ddpehdr *);
   65         deh->deh_pad = 0;
   66         deh->deh_hops = 0;
   67 
   68         deh->deh_len = m->m_pkthdr.len;
   69 
   70         deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
   71         deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
   72         deh->deh_dport = ddp->ddp_fsat.sat_port;
   73         deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
   74         deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
   75         deh->deh_sport = ddp->ddp_lsat.sat_port;
   76 
   77         /*
   78          * The checksum calculation is done after all of the other bytes have
   79          * been filled in.
   80          */
   81         if (ddp_cksum)
   82                 deh->deh_sum = at_cksum(m, sizeof(int));
   83         else
   84                 deh->deh_sum = 0;
   85         deh->deh_bytes = htonl(deh->deh_bytes);
   86 
   87         return ddp_route(m, &ddp->ddp_route);
   88 }
   89 
   90 u_short
   91 at_cksum(struct mbuf *m, int skip)
   92 {
   93         u_char         *data, *end;
   94         u_long          cksum = 0;
   95 
   96         for (; m; m = m->m_next) {
   97                 for (data = mtod(m, u_char *), end = data + m->m_len;
   98                     data < end; data++) {
   99                         if (skip) {
  100                                 skip--;
  101                                 continue;
  102                         }
  103                         cksum = (cksum + *data) << 1;
  104                         if (cksum & 0x00010000)
  105                                 cksum++;
  106                         cksum &= 0x0000ffff;
  107                 }
  108         }
  109 
  110         if (cksum == 0) {
  111                 cksum = 0x0000ffff;
  112         }
  113         return (u_short)cksum;
  114 }
  115 
  116 int
  117 ddp_route(struct mbuf *m, struct route *ro)
  118 {
  119         struct rtentry *rt;
  120         struct sockaddr_at gate;
  121         struct elaphdr *elh;
  122         struct at_ifaddr *aa = NULL;
  123         struct ifnet   *ifp = NULL;
  124         uint16_t        net;
  125         uint8_t         loopback = 0;
  126         int             error;
  127 
  128         if ((rt = rtcache_validate(ro)) != NULL && (ifp = rt->rt_ifp) != NULL) {
  129                 const struct sockaddr_at *dst = satocsat(rtcache_getdst(ro));
  130                 uint16_t dnet = dst->sat_addr.s_net;
  131                 uint8_t dnode = dst->sat_addr.s_node;
  132                 net = satosat(rt->rt_gateway)->sat_addr.s_net;
  133 
  134                 TAILQ_FOREACH(aa, &at_ifaddr, aa_list) {
  135                         if (ntohs(net) >= ntohs(aa->aa_firstnet) &&
  136                             ntohs(net) <= ntohs(aa->aa_lastnet)) {
  137                                 /* Are we talking to ourselves? */
  138                                 if (dnet == aa->aa_addr.sat_addr.s_net &&
  139                                     dnode == aa->aa_addr.sat_addr.s_node) {
  140                                         /* If to us, redirect to lo0. */
  141                                         ifp = lo0ifp;
  142                                 }
  143                                 /* Or is it a broadcast? */
  144                                 else if (dnet == aa->aa_addr.sat_addr.s_net &&
  145                                         dnode == 255) {
  146                                         /* If broadcast, loop back a copy. */
  147                                         loopback = 1;
  148                                 }
  149                                 break;
  150                         }
  151                 }
  152         }
  153         if (aa == NULL) {
  154 #ifdef NETATALKDEBUG
  155                 printf("%s: no address found\n", __func__);
  156 #endif
  157                 m_freem(m);
  158                 error = EINVAL;
  159                 goto out;
  160         }
  161         /*
  162          * There are several places in the kernel where data is added to
  163          * an mbuf without ensuring that the mbuf pointer is aligned.
  164          * This is bad for transition routing, since phase 1 and phase 2
  165          * packets end up poorly aligned due to the three byte elap header.
  166          */
  167         if (!(aa->aa_flags & AFA_PHASE2)) {
  168                 M_PREPEND(m, SZ_ELAPHDR, M_DONTWAIT);
  169                 if (m == NULL) {
  170                         error = ENOBUFS;
  171                         goto out;
  172                 }
  173 
  174                 elh = mtod(m, struct elaphdr *);
  175                 elh->el_snode = satosat(&aa->aa_addr)->sat_addr.s_node;
  176                 elh->el_type = ELAP_DDPEXTEND;
  177                 if (ntohs(satocsat(rtcache_getdst(ro))->sat_addr.s_net) >=
  178                     ntohs(aa->aa_firstnet) &&
  179                     ntohs(satocsat(rtcache_getdst(ro))->sat_addr.s_net) <=
  180                     ntohs(aa->aa_lastnet)) {
  181                         elh->el_dnode =
  182                             satocsat(rtcache_getdst(ro))->sat_addr.s_node;
  183                 } else {
  184                         elh->el_dnode =
  185                             satosat(rt->rt_gateway)->sat_addr.s_node;
  186                 }
  187         }
  188         if (ntohs(satocsat(rtcache_getdst(ro))->sat_addr.s_net) >=
  189             ntohs(aa->aa_firstnet) &&
  190             ntohs(satocsat(rtcache_getdst(ro))->sat_addr.s_net) <=
  191             ntohs(aa->aa_lastnet)) {
  192                 gate = *satocsat(rtcache_getdst(ro));
  193         } else {
  194                 gate = *satosat(rt->rt_gateway);
  195         }
  196         rt->rt_use++;
  197 
  198 #if IFA_STATS
  199         aa->aa_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len;
  200 #endif
  201 
  202         /* XXX */
  203         if (loopback && rtcache_getdst(ro)->sa_family == AF_APPLETALK) {
  204                 struct mbuf *copym = m_copypacket(m, M_DONTWAIT);
  205                 
  206 #ifdef NETATALKDEBUG
  207                 printf("Looping back (not AARP).\n");
  208 #endif
  209                 looutput(lo0ifp, copym, rtcache_getdst(ro), NULL);
  210         }
  211 
  212         error = if_output_lock(ifp, ifp, m, (struct sockaddr *)&gate, NULL);
  213 out:
  214         rtcache_unref(rt, ro);
  215         return error;
  216 }

Cache object: 0771de8d1c2ab01483a6e16163ea62d8

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

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