ipx_ip.c

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    1 /*
    2  * Copyright (c) 1995, Mike Mitchell
    3  * Copyright (c) 1984, 1985, 1986, 1987, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. All advertising materials mentioning features or use of this software
   15  *    must display the following acknowledgement:
   16  *      This product includes software developed by the University of
   17  *      California, Berkeley and its contributors.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  * 
   34  *      @(#)ipx_ip.c
   35  *
   36  * $FreeBSD$
   37  */
   38 
   39 /*
   40  * Software interface driver for encapsulating IPX in IP.
   41  */
   42 
   43 #include "opt_inet.h"
   44 #include "opt_ipx.h"
   45 
   46 #ifdef IPXIP
   47 #ifndef INET
   48 #error The option IPXIP requires option INET.
   49 #endif
   50 
   51 #include <sys/param.h>
   52 #include <sys/systm.h>
   53 #include <sys/malloc.h>
   54 #include <sys/mbuf.h>
   55 #include <sys/protosw.h>
   56 #include <sys/socket.h>
   57 #include <sys/socketvar.h>
   58 #include <sys/sockio.h>
   59 
   60 #include <net/if.h>
   61 #include <net/netisr.h>
   62 #include <net/route.h>
   63 
   64 #include <netinet/in.h>
   65 #include <netinet/in_systm.h>
   66 #include <netinet/in_var.h>
   67 #include <netinet/ip.h>
   68 #include <netinet/ip_var.h>
   69 
   70 #include <netipx/ipx.h>
   71 #include <netipx/ipx_if.h>
   72 #include <netipx/ipx_ip.h>
   73 #include <netipx/ipx_var.h>
   74 
   75 static struct   ifnet ipxipif;
   76 
   77 /* list of all hosts and gateways or broadcast addrs */
   78 static struct   ifnet_en *ipxip_list;
   79 
   80 static  struct ifnet_en *ipxipattach(void);
   81 static  int ipxip_free(struct ifnet *ifp);
   82 static  int ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
   83 static  int ipxipoutput(struct ifnet *ifp, struct mbuf *m,
   84                         struct sockaddr *dst, struct rtentry *rt);
   85 static  void ipxip_rtchange(struct in_addr *dst);
   86 static  void ipxipstart(struct ifnet *ifp);
   87 
   88 static struct ifnet_en *
   89 ipxipattach()
   90 {
   91         register struct ifnet_en *m;
   92         register struct ifnet *ifp;
   93 
   94         if (ipxipif.if_mtu == 0) {
   95                 ifp = &ipxipif;
   96                 ifp->if_name = "ipxip";
   97                 ifp->if_mtu = LOMTU;
   98                 ifp->if_ioctl = ipxipioctl;
   99                 ifp->if_output = ipxipoutput;
  100                 ifp->if_start = ipxipstart;
  101                 ifp->if_flags = IFF_POINTOPOINT;
  102         }
  103 
  104         MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT);
  105         if (m == NULL)
  106                 return (NULL);
  107         bzero(m, sizeof(*m));
  108         m->ifen_next = ipxip_list;
  109         ipxip_list = m;
  110         ifp = &m->ifen_ifnet;
  111 
  112         ifp->if_name = "ipxip";
  113         ifp->if_mtu = LOMTU;
  114         ifp->if_ioctl = ipxipioctl;
  115         ifp->if_output = ipxipoutput;
  116         ifp->if_start = ipxipstart;
  117         ifp->if_flags = IFF_POINTOPOINT;
  118         ifp->if_unit = ipxipif.if_unit++;
  119         if_attach(ifp);
  120 
  121         return (m);
  122 }
  123 
  124 
  125 /*
  126  * Process an ioctl request.
  127  */
  128 static int
  129 ipxipioctl(ifp, cmd, data)
  130         register struct ifnet *ifp;
  131         u_long cmd;
  132         caddr_t data;
  133 {
  134         int error = 0;
  135         struct ifreq *ifr;
  136 
  137         switch (cmd) {
  138 
  139         case SIOCSIFADDR:
  140                 ifp->if_flags |= IFF_UP;
  141                 /* fall into: */
  142 
  143         case SIOCSIFDSTADDR:
  144                 /*
  145                  * Everything else is done at a higher level.
  146                  */
  147                 break;
  148 
  149         case SIOCSIFFLAGS:
  150                 ifr = (struct ifreq *)data;
  151                 if ((ifr->ifr_flags & IFF_UP) == 0)
  152                         error = ipxip_free(ifp);
  153 
  154 
  155         default:
  156                 error = EINVAL;
  157         }
  158         return (error);
  159 }
  160 
  161 static struct mbuf *ipxip_badlen;
  162 static struct mbuf *ipxip_lastin;
  163 static int ipxip_hold_input;
  164 
  165 void
  166 ipxip_input(m, hlen)
  167         register struct mbuf *m;
  168         int hlen;
  169 {
  170         register struct ip *ip;
  171         register struct ipx *ipx;
  172         register struct ifqueue *ifq = &ipxintrq;
  173         int len, s;
  174 
  175         if (ipxip_hold_input) {
  176                 if (ipxip_lastin != NULL) {
  177                         m_freem(ipxip_lastin);
  178                 }
  179                 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
  180         }
  181         /*
  182          * Get IP and IPX header together in first mbuf.
  183          */
  184         ipxipif.if_ipackets++;
  185         s = sizeof(struct ip) + sizeof(struct ipx);
  186         if (((m->m_flags & M_EXT) || m->m_len < s) &&
  187             (m = m_pullup(m, s)) == NULL) {
  188                 ipxipif.if_ierrors++;
  189                 return;
  190         }
  191         ip = mtod(m, struct ip *);
  192         if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
  193                 ip_stripoptions(m, (struct mbuf *)NULL);
  194                 if (m->m_len < s) {
  195                         if ((m = m_pullup(m, s)) == NULL) {
  196                                 ipxipif.if_ierrors++;
  197                                 return;
  198                         }
  199                         ip = mtod(m, struct ip *);
  200                 }
  201         }
  202 
  203         /*
  204          * Make mbuf data length reflect IPX length.
  205          * If not enough data to reflect IPX length, drop.
  206          */
  207         m->m_data += sizeof(struct ip);
  208         m->m_len -= sizeof(struct ip);
  209         m->m_pkthdr.len -= sizeof(struct ip);
  210         ipx = mtod(m, struct ipx *);
  211         len = ntohs(ipx->ipx_len);
  212         if (len & 1)
  213                 len++;          /* Preserve Garbage Byte */
  214         if (ip->ip_len != len) {
  215                 if (len > ip->ip_len) {
  216                         ipxipif.if_ierrors++;
  217                         if (ipxip_badlen)
  218                                 m_freem(ipxip_badlen);
  219                         ipxip_badlen = m;
  220                         return;
  221                 }
  222                 /* Any extra will be trimmed off by the IPX routines */
  223         }
  224 
  225         /*
  226          * Deliver to IPX
  227          */
  228         s = splimp();
  229         if (IF_QFULL(ifq)) {
  230                 IF_DROP(ifq);
  231                 m_freem(m);
  232                 splx(s);
  233                 return;
  234         }
  235         IF_ENQUEUE(ifq, m);
  236         schednetisr(NETISR_IPX);
  237         splx(s);
  238         return;
  239 }
  240 
  241 static int
  242 ipxipoutput(ifp, m, dst, rt)
  243         struct ifnet *ifp;
  244         register struct mbuf *m;
  245         struct sockaddr *dst;
  246         struct rtentry *rt;
  247 {
  248         register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
  249         register struct ip *ip;
  250         register struct route *ro = &(ifn->ifen_route);
  251         register int len = 0;
  252         register struct ipx *ipx = mtod(m, struct ipx *);
  253         int error;
  254 
  255         ifn->ifen_ifnet.if_opackets++;
  256         ipxipif.if_opackets++;
  257 
  258         /*
  259          * Calculate data length and make space
  260          * for IP header.
  261          */
  262         len =  ntohs(ipx->ipx_len);
  263         if (len & 1)
  264                 len++;          /* Preserve Garbage Byte */
  265         /* following clause not necessary on vax */
  266         if (3 & (int)m->m_data) {
  267                 /* force longword alignment of ip hdr */
  268                 struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
  269                 if (m0 == NULL) {
  270                         m_freem(m);
  271                         return (ENOBUFS);
  272                 }
  273                 MH_ALIGN(m0, sizeof(struct ip));
  274                 m0->m_flags = m->m_flags & M_COPYFLAGS;
  275                 m0->m_next = m;
  276                 m0->m_len = sizeof(struct ip);
  277                 m0->m_pkthdr.len = m0->m_len + m->m_len;
  278                 m->m_flags &= ~M_PKTHDR;
  279                 m = m0;
  280         } else {
  281                 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  282                 if (m == NULL)
  283                         return (ENOBUFS);
  284         }
  285         /*
  286          * Fill in IP header.
  287          */
  288         ip = mtod(m, struct ip *);
  289         *(long *)ip = 0;
  290         ip->ip_p = IPPROTO_IDP;
  291         ip->ip_src = ifn->ifen_src;
  292         ip->ip_dst = ifn->ifen_dst;
  293         ip->ip_len = (u_short)len + sizeof(struct ip);
  294         ip->ip_ttl = MAXTTL;
  295 
  296         /*
  297          * Output final datagram.
  298          */
  299         error =  (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL));
  300         if (error) {
  301                 ifn->ifen_ifnet.if_oerrors++;
  302                 ifn->ifen_ifnet.if_ierrors = error;
  303         }
  304         return (error);
  305         m_freem(m);
  306         return (ENETUNREACH);
  307 }
  308 
  309 static void
  310 ipxipstart(ifp)
  311 struct ifnet *ifp;
  312 {
  313         panic("ipxip_start called\n");
  314 }
  315 
  316 static struct ifreq ifr_ipxip = {"ipxip0"};
  317 
  318 int
  319 ipxip_route(so, sopt)
  320         struct socket *so;
  321         struct sockopt *sopt;
  322 {
  323         int error;
  324         struct ifnet_en *ifn;
  325         struct sockaddr_in *src;
  326         struct ipxip_req rq;
  327         struct sockaddr_ipx *ipx_dst;
  328         struct sockaddr_in *ip_dst;
  329         struct route ro;
  330 
  331         error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
  332         if (error)
  333                 return (error);
  334         ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
  335         ip_dst = (struct sockaddr_in *)&rq.rq_ip;
  336 
  337         /*
  338          * First, make sure we already have an IPX address:
  339          */
  340         if (ipx_ifaddr == NULL)
  341                 return (EADDRNOTAVAIL);
  342         /*
  343          * Now, determine if we can get to the destination
  344          */
  345         bzero((caddr_t)&ro, sizeof(ro));
  346         ro.ro_dst = *(struct sockaddr *)ip_dst;
  347         rtalloc(&ro);
  348         if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
  349                 return (ENETUNREACH);
  350         }
  351 
  352         /*
  353          * And see how he's going to get back to us:
  354          * i.e., what return ip address do we use?
  355          */
  356         {
  357                 register struct in_ifaddr *ia;
  358                 struct ifnet *ifp = ro.ro_rt->rt_ifp;
  359 
  360                 for (ia = in_ifaddrhead.tqh_first; ia != NULL; 
  361                      ia = ia->ia_link.tqe_next)
  362                         if (ia->ia_ifp == ifp)
  363                                 break;
  364                 if (ia == NULL)
  365                         ia = in_ifaddrhead.tqh_first;
  366                 if (ia == NULL) {
  367                         RTFREE(ro.ro_rt);
  368                         return (EADDRNOTAVAIL);
  369                 }
  370                 src = (struct sockaddr_in *)&ia->ia_addr;
  371         }
  372 
  373         /*
  374          * Is there a free (pseudo-)interface or space?
  375          */
  376         for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
  377                 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
  378                         break;
  379         }
  380         if (ifn == NULL)
  381                 ifn = ipxipattach();
  382         if (ifn == NULL) {
  383                 RTFREE(ro.ro_rt);
  384                 return (ENOBUFS);
  385         }
  386         ifn->ifen_route = ro;
  387         ifn->ifen_dst =  ip_dst->sin_addr;
  388         ifn->ifen_src = src->sin_addr;
  389 
  390         /*
  391          * now configure this as a point to point link
  392          */
  393         ifr_ipxip.ifr_name[4] = '' + ipxipif.if_unit - 1;
  394         ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
  395         ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
  396                         (struct ifnet *)ifn, sopt->sopt_p);
  397 
  398         /* use any of our addresses */
  399         satoipx_addr(ifr_ipxip.ifr_addr).x_host = 
  400                         ipx_ifaddr->ia_addr.sipx_addr.x_host;
  401 
  402         return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
  403                         (struct ifnet *)ifn, sopt->sopt_p));
  404 }
  405 
  406 static int
  407 ipxip_free(ifp)
  408 struct ifnet *ifp;
  409 {
  410         register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
  411         struct route *ro = & ifn->ifen_route;
  412 
  413         if (ro->ro_rt != NULL) {
  414                 RTFREE(ro->ro_rt);
  415                 ro->ro_rt = NULL;
  416         }
  417         ifp->if_flags &= ~IFF_UP;
  418         return (0);
  419 }
  420 
  421 void
  422 ipxip_ctlinput(cmd, sa, dummy)
  423         int cmd;
  424         struct sockaddr *sa;
  425         void *dummy;
  426 {
  427         struct sockaddr_in *sin;
  428 
  429         if ((unsigned)cmd >= PRC_NCMDS)
  430                 return;
  431         if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
  432                 return;
  433         sin = (struct sockaddr_in *)sa;
  434         if (sin->sin_addr.s_addr == INADDR_ANY)
  435                 return;
  436 
  437         switch (cmd) {
  438 
  439         case PRC_ROUTEDEAD:
  440         case PRC_REDIRECT_NET:
  441         case PRC_REDIRECT_HOST:
  442         case PRC_REDIRECT_TOSNET:
  443         case PRC_REDIRECT_TOSHOST:
  444                 ipxip_rtchange(&sin->sin_addr);
  445                 break;
  446         }
  447 }
  448 
  449 static void
  450 ipxip_rtchange(dst)
  451         register struct in_addr *dst;
  452 {
  453         register struct ifnet_en *ifn;
  454 
  455         for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
  456                 if (ifn->ifen_dst.s_addr == dst->s_addr &&
  457                         ifn->ifen_route.ro_rt != NULL) {
  458                                 RTFREE(ifn->ifen_route.ro_rt);
  459                                 ifn->ifen_route.ro_rt = NULL;
  460                 }
  461         }
  462 }
  463 #endif /* IPXIP */
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FreeBSD/Linux Kernel Cross Reference sys/netipx/ipx_ip.c

FreeBSD/Linux Kernel Cross Reference
sys/netipx/ipx_ip.c
