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 | M_ZERO);
  105         if (m == NULL)
  106                 return (NULL);
  107         m->ifen_next = ipxip_list;
  108         ipxip_list = m;
  109         ifp = &m->ifen_ifnet;
  110 
  111         ifp->if_name = "ipxip";
  112         ifp->if_mtu = LOMTU;
  113         ifp->if_ioctl = ipxipioctl;
  114         ifp->if_output = ipxipoutput;
  115         ifp->if_start = ipxipstart;
  116         ifp->if_flags = IFF_POINTOPOINT;
  117         ifp->if_unit = ipxipif.if_unit++;
  118         if_attach(ifp);
  119 
  120         return (m);
  121 }
  122 
  123 
  124 /*
  125  * Process an ioctl request.
  126  */
  127 static int
  128 ipxipioctl(ifp, cmd, data)
  129         register struct ifnet *ifp;
  130         u_long cmd;
  131         caddr_t data;
  132 {
  133         int error = 0;
  134         struct ifreq *ifr;
  135 
  136         switch (cmd) {
  137 
  138         case SIOCSIFADDR:
  139                 ifp->if_flags |= IFF_UP;
  140                 /* fall into: */
  141 
  142         case SIOCSIFDSTADDR:
  143                 /*
  144                  * Everything else is done at a higher level.
  145                  */
  146                 break;
  147 
  148         case SIOCSIFFLAGS:
  149                 ifr = (struct ifreq *)data;
  150                 if ((ifr->ifr_flags & IFF_UP) == 0)
  151                         error = ipxip_free(ifp);
  152 
  153 
  154         default:
  155                 error = EINVAL;
  156         }
  157         return (error);
  158 }
  159 
  160 static struct mbuf *ipxip_badlen;
  161 static struct mbuf *ipxip_lastin;
  162 static int ipxip_hold_input;
  163 
  164 void
  165 ipxip_input(m, hlen)
  166         register struct mbuf *m;
  167         int hlen;
  168 {
  169         register struct ip *ip;
  170         register struct ipx *ipx;
  171         register struct ifqueue *ifq = &ipxintrq;
  172         int len, s;
  173 
  174         if (ipxip_hold_input) {
  175                 if (ipxip_lastin != NULL) {
  176                         m_freem(ipxip_lastin);
  177                 }
  178                 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
  179         }
  180         /*
  181          * Get IP and IPX header together in first mbuf.
  182          */
  183         ipxipif.if_ipackets++;
  184         s = sizeof(struct ip) + sizeof(struct ipx);
  185         if (((m->m_flags & M_EXT) || m->m_len < s) &&
  186             (m = m_pullup(m, s)) == NULL) {
  187                 ipxipif.if_ierrors++;
  188                 return;
  189         }
  190         ip = mtod(m, struct ip *);
  191         if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
  192                 ip_stripoptions(m, (struct mbuf *)NULL);
  193                 if (m->m_len < s) {
  194                         if ((m = m_pullup(m, s)) == NULL) {
  195                                 ipxipif.if_ierrors++;
  196                                 return;
  197                         }
  198                         ip = mtod(m, struct ip *);
  199                 }
  200         }
  201 
  202         /*
  203          * Make mbuf data length reflect IPX length.
  204          * If not enough data to reflect IPX length, drop.
  205          */
  206         m->m_data += sizeof(struct ip);
  207         m->m_len -= sizeof(struct ip);
  208         m->m_pkthdr.len -= sizeof(struct ip);
  209         ipx = mtod(m, struct ipx *);
  210         len = ntohs(ipx->ipx_len);
  211         if (len & 1)
  212                 len++;          /* Preserve Garbage Byte */
  213         if (ip->ip_len != len) {
  214                 if (len > ip->ip_len) {
  215                         ipxipif.if_ierrors++;
  216                         if (ipxip_badlen)
  217                                 m_freem(ipxip_badlen);
  218                         ipxip_badlen = m;
  219                         return;
  220                 }
  221                 /* Any extra will be trimmed off by the IPX routines */
  222         }
  223 
  224         /*
  225          * Deliver to IPX
  226          */
  227         s = splimp();
  228         if (IF_QFULL(ifq)) {
  229                 IF_DROP(ifq);
  230                 m_freem(m);
  231                 splx(s);
  232                 return;
  233         }
  234         IF_ENQUEUE(ifq, m);
  235         schednetisr(NETISR_IPX);
  236         splx(s);
  237         return;
  238 }
  239 
  240 static int
  241 ipxipoutput(ifp, m, dst, rt)
  242         struct ifnet *ifp;
  243         struct mbuf *m;
  244         struct sockaddr *dst;
  245         struct rtentry *rt;
  246 {
  247         register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
  248         register struct ip *ip;
  249         register struct route *ro = &(ifn->ifen_route);
  250         register int len = 0;
  251         register struct ipx *ipx = mtod(m, struct ipx *);
  252         int error;
  253 
  254         ifn->ifen_ifnet.if_opackets++;
  255         ipxipif.if_opackets++;
  256 
  257         /*
  258          * Calculate data length and make space
  259          * for IP header.
  260          */
  261         len =  ntohs(ipx->ipx_len);
  262         if (len & 1)
  263                 len++;          /* Preserve Garbage Byte */
  264         /* following clause not necessary on vax */
  265         if (3 & (int)m->m_data) {
  266                 /* force longword alignment of ip hdr */
  267                 struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
  268                 if (m0 == NULL) {
  269                         m_freem(m);
  270                         return (ENOBUFS);
  271                 }
  272                 MH_ALIGN(m0, sizeof(struct ip));
  273                 m0->m_flags = m->m_flags & M_COPYFLAGS;
  274                 m0->m_next = m;
  275                 m0->m_len = sizeof(struct ip);
  276                 m0->m_pkthdr.len = m0->m_len + m->m_len;
  277                 m->m_flags &= ~M_PKTHDR;
  278                 m = m0;
  279         } else {
  280                 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  281                 if (m == NULL)
  282                         return (ENOBUFS);
  283         }
  284         /*
  285          * Fill in IP header.
  286          */
  287         ip = mtod(m, struct ip *);
  288         *(long *)ip = 0;
  289         ip->ip_p = IPPROTO_IDP;
  290         ip->ip_src = ifn->ifen_src;
  291         ip->ip_dst = ifn->ifen_dst;
  292         ip->ip_len = (u_short)len + sizeof(struct ip);
  293         ip->ip_ttl = MAXTTL;
  294 
  295         /*
  296          * Output final datagram.
  297          */
  298         error =  (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL, NULL));
  299         if (error) {
  300                 ifn->ifen_ifnet.if_oerrors++;
  301                 ifn->ifen_ifnet.if_ierrors = error;
  302         }
  303         return (error);
  304         m_freem(m);
  305         return (ENETUNREACH);
  306 }
  307 
  308 static void
  309 ipxipstart(ifp)
  310 struct ifnet *ifp;
  311 {
  312         panic("ipxip_start called\n");
  313 }
  314 
  315 static struct ifreq ifr_ipxip = {"ipxip0"};
  316 
  317 int
  318 ipxip_route(so, sopt)
  319         struct socket *so;
  320         struct sockopt *sopt;
  321 {
  322         int error;
  323         struct ifnet_en *ifn;
  324         struct sockaddr_in *src;
  325         struct ipxip_req rq;
  326         struct sockaddr_ipx *ipx_dst;
  327         struct sockaddr_in *ip_dst;
  328         struct route ro;
  329 
  330         error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
  331         if (error)
  332                 return (error);
  333         ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
  334         ip_dst = (struct sockaddr_in *)&rq.rq_ip;
  335 
  336         /*
  337          * First, make sure we already have an IPX address:
  338          */
  339         if (ipx_ifaddr == NULL)
  340                 return (EADDRNOTAVAIL);
  341         /*
  342          * Now, determine if we can get to the destination
  343          */
  344         bzero((caddr_t)&ro, sizeof(ro));
  345         ro.ro_dst = *(struct sockaddr *)ip_dst;
  346         rtalloc(&ro);
  347         if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
  348                 return (ENETUNREACH);
  349         }
  350 
  351         /*
  352          * And see how he's going to get back to us:
  353          * i.e., what return ip address do we use?
  354          */
  355         {
  356                 register struct in_ifaddr *ia;
  357                 struct ifnet *ifp = ro.ro_rt->rt_ifp;
  358 
  359                 for (ia = TAILQ_FIRST(&in_ifaddrhead); ia != NULL; 
  360                      ia = TAILQ_NEXT(ia, ia_link))
  361                         if (ia->ia_ifp == ifp)
  362                                 break;
  363                 if (ia == NULL)
  364                         ia = TAILQ_FIRST(&in_ifaddrhead);
  365                 if (ia == NULL) {
  366                         RTFREE(ro.ro_rt);
  367                         return (EADDRNOTAVAIL);
  368                 }
  369                 src = (struct sockaddr_in *)&ia->ia_addr;
  370         }
  371 
  372         /*
  373          * Is there a free (pseudo-)interface or space?
  374          */
  375         for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
  376                 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
  377                         break;
  378         }
  379         if (ifn == NULL)
  380                 ifn = ipxipattach();
  381         if (ifn == NULL) {
  382                 RTFREE(ro.ro_rt);
  383                 return (ENOBUFS);
  384         }
  385         ifn->ifen_route = ro;
  386         ifn->ifen_dst =  ip_dst->sin_addr;
  387         ifn->ifen_src = src->sin_addr;
  388 
  389         /*
  390          * now configure this as a point to point link
  391          */
  392         ifr_ipxip.ifr_name[4] = '' + ipxipif.if_unit - 1;
  393         ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
  394         ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
  395                         (struct ifnet *)ifn, sopt->sopt_p);
  396 
  397         /* use any of our addresses */
  398         satoipx_addr(ifr_ipxip.ifr_addr).x_host = 
  399                         ipx_ifaddr->ia_addr.sipx_addr.x_host;
  400 
  401         return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
  402                         (struct ifnet *)ifn, sopt->sopt_p));
  403 }
  404 
  405 static int
  406 ipxip_free(ifp)
  407 struct ifnet *ifp;
  408 {
  409         register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
  410         struct route *ro = & ifn->ifen_route;
  411 
  412         if (ro->ro_rt != NULL) {
  413                 RTFREE(ro->ro_rt);
  414                 ro->ro_rt = NULL;
  415         }
  416         ifp->if_flags &= ~IFF_UP;
  417         return (0);
  418 }
  419 
  420 void
  421 ipxip_ctlinput(cmd, sa, dummy)
  422         int cmd;
  423         struct sockaddr *sa;
  424         void *dummy;
  425 {
  426         struct sockaddr_in *sin;
  427 
  428         if ((unsigned)cmd >= PRC_NCMDS)
  429                 return;
  430         if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
  431                 return;
  432         sin = (struct sockaddr_in *)sa;
  433         if (sin->sin_addr.s_addr == INADDR_ANY)
  434                 return;
  435 
  436         switch (cmd) {
  437 
  438         case PRC_ROUTEDEAD:
  439         case PRC_REDIRECT_NET:
  440         case PRC_REDIRECT_HOST:
  441         case PRC_REDIRECT_TOSNET:
  442         case PRC_REDIRECT_TOSHOST:
  443                 ipxip_rtchange(&sin->sin_addr);
  444                 break;
  445         }
  446 }
  447 
  448 static void
  449 ipxip_rtchange(dst)
  450         register struct in_addr *dst;
  451 {
  452         register struct ifnet_en *ifn;
  453 
  454         for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
  455                 if (ifn->ifen_dst.s_addr == dst->s_addr &&
  456                         ifn->ifen_route.ro_rt != NULL) {
  457                                 RTFREE(ifn->ifen_route.ro_rt);
  458                                 ifn->ifen_route.ro_rt = NULL;
  459                 }
  460         }
  461 }
  462 #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
