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: src/sys/netipx/ipx_ip.c,v 1.9.2.2 1999/09/05 08:18:59 peter Exp $
   37  */
   38 
   39 /*
   40  * Software interface driver for encapsulating IPX in IP.
   41  */
   42 
   43 #ifdef IPXIP
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/malloc.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/protosw.h>
   49 #include <sys/socket.h>
   50 #include <sys/sockio.h>
   51 
   52 #include <net/if.h>
   53 #include <net/netisr.h>
   54 #include <net/route.h>
   55 
   56 #include <netinet/in.h>
   57 #include <netinet/in_systm.h>
   58 #include <netinet/in_var.h>
   59 #include <netinet/ip.h>
   60 #include <netinet/ip_var.h>
   61 
   62 #include <netipx/ipx.h>
   63 #include <netipx/ipx_if.h>
   64 #include <netipx/ipx_ip.h>
   65 #include <netipx/ipx_var.h>
   66 
   67 struct  ifnet ipxipif;
   68 struct  ifnet_en *ipxip_list; /* list of all hosts and gateways or broadcast addrs */
   69 
   70 static  struct ifnet_en *ipxipattach(void);
   71 static  int ipxip_free(struct ifnet *ifp);
   72 static  int ipxipioctl(struct ifnet *ifp, int cmd, caddr_t data);
   73 static  int ipxipoutput(struct ifnet *ifp, struct mbuf *m,
   74                         struct sockaddr *dst, struct rtentry *rt);
   75 static  void ipxip_rtchange(struct in_addr *dst);
   76 static  void ipxipstart(struct ifnet *ifp);
   77 
   78 static struct ifnet_en *
   79 ipxipattach()
   80 {
   81         register struct ifnet_en *m;
   82         register struct ifnet *ifp;
   83 
   84         if (ipxipif.if_mtu == 0) {
   85                 ifp = &ipxipif;
   86                 ifp->if_name = "ipxip";
   87                 ifp->if_mtu = LOMTU;
   88                 ifp->if_ioctl = ipxipioctl;
   89                 ifp->if_output = ipxipoutput;
   90                 ifp->if_start = ipxipstart;
   91                 ifp->if_flags = IFF_POINTOPOINT;
   92         }
   93 
   94         MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT);
   95         if (m == NULL)
   96                 return (NULL);
   97         bzero(m, sizeof(*m));
   98         m->ifen_next = ipxip_list;
   99         ipxip_list = m;
  100         ifp = &m->ifen_ifnet;
  101 
  102         ifp->if_name = "ipxip";
  103         ifp->if_mtu = LOMTU;
  104         ifp->if_ioctl = ipxipioctl;
  105         ifp->if_output = ipxipoutput;
  106         ifp->if_start = ipxipstart;
  107         ifp->if_flags = IFF_POINTOPOINT;
  108         ifp->if_unit = ipxipif.if_unit++;
  109         if_attach(ifp);
  110 
  111         return (m);
  112 }
  113 
  114 
  115 /*
  116  * Process an ioctl request.
  117  */
  118 static int
  119 ipxipioctl(ifp, cmd, data)
  120         register struct ifnet *ifp;
  121         int cmd;
  122         caddr_t data;
  123 {
  124         int error = 0;
  125         struct ifreq *ifr;
  126 
  127         switch (cmd) {
  128 
  129         case SIOCSIFADDR:
  130                 ifp->if_flags |= IFF_UP;
  131                 /* fall into: */
  132 
  133         case SIOCSIFDSTADDR:
  134                 /*
  135                  * Everything else is done at a higher level.
  136                  */
  137                 break;
  138 
  139         case SIOCSIFFLAGS:
  140                 ifr = (struct ifreq *)data;
  141                 if ((ifr->ifr_flags & IFF_UP) == 0)
  142                         error = ipxip_free(ifp);
  143 
  144 
  145         default:
  146                 error = EINVAL;
  147         }
  148         return (error);
  149 }
  150 
  151 struct mbuf *ipxip_badlen;
  152 struct mbuf *ipxip_lastin;
  153 int ipxip_hold_input;
  154 
  155 void
  156 ipxip_input(m, hlen)
  157         register struct mbuf *m;
  158         int hlen;
  159 {
  160         register struct ip *ip;
  161         register struct ipx *ipx;
  162         register struct ifqueue *ifq = &ipxintrq;
  163         int len, s;
  164 
  165         if (ipxip_hold_input) {
  166                 if (ipxip_lastin != NULL) {
  167                         m_freem(ipxip_lastin);
  168                 }
  169                 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
  170         }
  171         /*
  172          * Get IP and IPX header together in first mbuf.
  173          */
  174         ipxipif.if_ipackets++;
  175         s = sizeof(struct ip) + sizeof(struct ipx);
  176         if (((m->m_flags & M_EXT) || m->m_len < s) &&
  177             (m = m_pullup(m, s)) == NULL) {
  178                 ipxipif.if_ierrors++;
  179                 return;
  180         }
  181         ip = mtod(m, struct ip *);
  182         if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
  183                 ip_stripoptions(m, (struct mbuf *)NULL);
  184                 if (m->m_len < s) {
  185                         if ((m = m_pullup(m, s)) == NULL) {
  186                                 ipxipif.if_ierrors++;
  187                                 return;
  188                         }
  189                         ip = mtod(m, struct ip *);
  190                 }
  191         }
  192 
  193         /*
  194          * Make mbuf data length reflect IPX length.
  195          * If not enough data to reflect IPX length, drop.
  196          */
  197         m->m_data += sizeof(struct ip);
  198         m->m_len -= sizeof(struct ip);
  199         m->m_pkthdr.len -= sizeof(struct ip);
  200         ipx = mtod(m, struct ipx *);
  201         len = ntohs(ipx->ipx_len);
  202         if (len & 1)
  203                 len++;          /* Preserve Garbage Byte */
  204         if (ip->ip_len != len) {
  205                 if (len > ip->ip_len) {
  206                         ipxipif.if_ierrors++;
  207                         if (ipxip_badlen)
  208                                 m_freem(ipxip_badlen);
  209                         ipxip_badlen = m;
  210                         return;
  211                 }
  212                 /* Any extra will be trimmed off by the IPX routines */
  213         }
  214 
  215         /*
  216          * Deliver to IPX
  217          */
  218         s = splimp();
  219         if (IF_QFULL(ifq)) {
  220                 IF_DROP(ifq);
  221                 m_freem(m);
  222                 splx(s);
  223                 return;
  224         }
  225         IF_ENQUEUE(ifq, m);
  226         schednetisr(NETISR_IPX);
  227         splx(s);
  228         return;
  229 }
  230 
  231 static int
  232 ipxipoutput(ifp, m, dst, rt)
  233         struct ifnet *ifp;
  234         register struct mbuf *m;
  235         struct sockaddr *dst;
  236         struct rtentry *rt;
  237 {
  238         register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
  239         register struct ip *ip;
  240         register struct route *ro = &(ifn->ifen_route);
  241         register int len = 0;
  242         register struct ipx *ipx = mtod(m, struct ipx *);
  243         int error;
  244 
  245         ifn->ifen_ifnet.if_opackets++;
  246         ipxipif.if_opackets++;
  247 
  248         /*
  249          * Calculate data length and make space
  250          * for IP header.
  251          */
  252         len =  ntohs(ipx->ipx_len);
  253         if (len & 1)
  254                 len++;          /* Preserve Garbage Byte */
  255         /* following clause not necessary on vax */
  256         if (3 & (int)m->m_data) {
  257                 /* force longword alignment of ip hdr */
  258                 struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
  259                 if (m0 == NULL) {
  260                         m_freem(m);
  261                         return (ENOBUFS);
  262                 }
  263                 MH_ALIGN(m0, sizeof(struct ip));
  264                 m0->m_flags = m->m_flags & M_COPYFLAGS;
  265                 m0->m_next = m;
  266                 m0->m_len = sizeof(struct ip);
  267                 m0->m_pkthdr.len = m0->m_len + m->m_len;
  268                 m->m_flags &= ~M_PKTHDR;
  269                 m = m0;
  270         } else {
  271                 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  272                 if (m == NULL)
  273                         return (ENOBUFS);
  274         }
  275         /*
  276          * Fill in IP header.
  277          */
  278         ip = mtod(m, struct ip *);
  279         *(long *)ip = 0;
  280         ip->ip_p = IPPROTO_IDP;
  281         ip->ip_src = ifn->ifen_src;
  282         ip->ip_dst = ifn->ifen_dst;
  283         ip->ip_len = (u_short)len + sizeof(struct ip);
  284         ip->ip_ttl = MAXTTL;
  285 
  286         /*
  287          * Output final datagram.
  288          */
  289         error =  (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL));
  290         if (error) {
  291                 ifn->ifen_ifnet.if_oerrors++;
  292                 ifn->ifen_ifnet.if_ierrors = error;
  293         }
  294         return (error);
  295         m_freem(m);
  296         return (ENETUNREACH);
  297 }
  298 
  299 static void
  300 ipxipstart(ifp)
  301 struct ifnet *ifp;
  302 {
  303         panic("ipxip_start called\n");
  304 }
  305 
  306 struct ifreq ifr_ipxip = {"ipxip0"};
  307 
  308 int
  309 ipxip_route(so, m)
  310         struct socket *so;
  311         register struct mbuf *m;
  312 {
  313         register struct ipxip_req *rq = mtod(m, struct ipxip_req *);
  314         struct sockaddr_ipx *ipx_dst = (struct sockaddr_ipx *)&rq->rq_ipx;
  315         struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
  316         struct route ro;
  317         struct ifnet_en *ifn;
  318         struct sockaddr_in *src;
  319 
  320         /*
  321          * First, make sure we already have an IPX address:
  322          */
  323         if (ipx_ifaddr == NULL)
  324                 return (EADDRNOTAVAIL);
  325         /*
  326          * Now, determine if we can get to the destination
  327          */
  328         bzero((caddr_t)&ro, sizeof(ro));
  329         ro.ro_dst = *(struct sockaddr *)ip_dst;
  330         rtalloc(&ro);
  331         if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
  332                 return (ENETUNREACH);
  333         }
  334 
  335         /*
  336          * And see how he's going to get back to us:
  337          * i.e., what return ip address do we use?
  338          */
  339         {
  340                 register struct in_ifaddr *ia;
  341                 struct ifnet *ifp = ro.ro_rt->rt_ifp;
  342 
  343                 for (ia = in_ifaddr; ia != NULL; ia = ia->ia_next)
  344                         if (ia->ia_ifp == ifp)
  345                                 break;
  346                 if (ia == NULL)
  347                         ia = in_ifaddr;
  348                 if (ia == NULL) {
  349                         RTFREE(ro.ro_rt);
  350                         return (EADDRNOTAVAIL);
  351                 }
  352                 src = (struct sockaddr_in *)&ia->ia_addr;
  353         }
  354 
  355         /*
  356          * Is there a free (pseudo-)interface or space?
  357          */
  358         for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
  359                 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
  360                         break;
  361         }
  362         if (ifn == NULL)
  363                 ifn = ipxipattach();
  364         if (ifn == NULL) {
  365                 RTFREE(ro.ro_rt);
  366                 return (ENOBUFS);
  367         }
  368         ifn->ifen_route = ro;
  369         ifn->ifen_dst =  ip_dst->sin_addr;
  370         ifn->ifen_src = src->sin_addr;
  371 
  372         /*
  373          * now configure this as a point to point link
  374          */
  375         ifr_ipxip.ifr_name[4] = '' + ipxipif.if_unit - 1;
  376         ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
  377         ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
  378                         (struct ifnet *)ifn);
  379 
  380         /* use any of our addresses */
  381         satoipx_addr(ifr_ipxip.ifr_addr).x_host = 
  382                         ipx_ifaddr->ia_addr.sipx_addr.x_host;
  383 
  384         return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
  385                         (struct ifnet *)ifn));
  386 }
  387 
  388 static int
  389 ipxip_free(ifp)
  390 struct ifnet *ifp;
  391 {
  392         register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
  393         struct route *ro = & ifn->ifen_route;
  394 
  395         if (ro->ro_rt != NULL) {
  396                 RTFREE(ro->ro_rt);
  397                 ro->ro_rt = NULL;
  398         }
  399         ifp->if_flags &= ~IFF_UP;
  400         return (0);
  401 }
  402 
  403 void
  404 ipxip_ctlinput(cmd, sa, dummy)
  405         int cmd;
  406         struct sockaddr *sa;
  407         void *dummy;
  408 {
  409         struct sockaddr_in *sin;
  410 
  411         if ((unsigned)cmd >= PRC_NCMDS)
  412                 return;
  413         if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
  414                 return;
  415         sin = (struct sockaddr_in *)sa;
  416         if (sin->sin_addr.s_addr == INADDR_ANY)
  417                 return;
  418 
  419         switch (cmd) {
  420 
  421         case PRC_ROUTEDEAD:
  422         case PRC_REDIRECT_NET:
  423         case PRC_REDIRECT_HOST:
  424         case PRC_REDIRECT_TOSNET:
  425         case PRC_REDIRECT_TOSHOST:
  426                 ipxip_rtchange(&sin->sin_addr);
  427                 break;
  428         }
  429 }
  430 
  431 static void
  432 ipxip_rtchange(dst)
  433         register struct in_addr *dst;
  434 {
  435         register struct ifnet_en *ifn;
  436 
  437         for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
  438                 if (ifn->ifen_dst.s_addr == dst->s_addr &&
  439                         ifn->ifen_route.ro_rt != NULL) {
  440                                 RTFREE(ifn->ifen_route.ro_rt);
  441                                 ifn->ifen_route.ro_rt = NULL;
  442                 }
  443         }
  444 }
  445 #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
