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


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FreeBSD/Linux Kernel Cross Reference
sys/netipx/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 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/6.4/sys/netipx/ipx_ip.c 157262 2006-03-29 12:42:43Z rwatson $");
   39 
   40 /*
   41  * Software interface driver for encapsulating IPX in IP.
   42  */
   43 
   44 #include "opt_inet.h"
   45 #include "opt_ipx.h"
   46 
   47 #ifdef IPXIP
   48 #ifndef INET
   49 #error The option IPXIP requires option INET.
   50 #endif
   51 
   52 #include <sys/param.h>
   53 #include <sys/kernel.h>
   54 #include <sys/systm.h>
   55 #include <sys/malloc.h>
   56 #include <sys/mbuf.h>
   57 #include <sys/protosw.h>
   58 #include <sys/socket.h>
   59 #include <sys/socketvar.h>
   60 #include <sys/sockio.h>
   61 
   62 #include <net/if.h>
   63 #include <net/if_types.h>
   64 #include <net/netisr.h>
   65 #include <net/route.h>
   66 
   67 #include <netinet/in.h>
   68 #include <netinet/in_systm.h>
   69 #include <netinet/in_var.h>
   70 #include <netinet/ip.h>
   71 #include <netinet/ip_var.h>
   72 
   73 #include <netipx/ipx.h>
   74 #include <netipx/ipx_if.h>
   75 #include <netipx/ipx_ip.h>
   76 #include <netipx/ipx_var.h>
   77 
   78 NET_NEEDS_GIANT("ipx_ip");
   79 
   80 static struct   ifnet ipxipif;
   81 static int      ipxipif_units;
   82 
   83 /* list of all hosts and gateways or broadcast addrs */
   84 static struct   ifnet_en *ipxip_list;
   85 
   86 static  struct ifnet_en *ipxipattach(void);
   87 static  int ipxip_free(struct ifnet *ifp);
   88 static  int ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
   89 static  int ipxipoutput(struct ifnet *ifp, struct mbuf *m,
   90                         struct sockaddr *dst, struct rtentry *rt);
   91 static  void ipxip_rtchange(struct in_addr *dst);
   92 static  void ipxipstart(struct ifnet *ifp);
   93 
   94 static struct ifnet_en *
   95 ipxipattach()
   96 {
   97         register struct ifnet_en *m;
   98         register struct ifnet *ifp;
   99 
  100         if (ipxipif.if_mtu == 0) {
  101                 ifp = &ipxipif;
  102                 if_initname(ifp, "ipxip", ipxipif_units);
  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         }
  109 
  110         MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT | M_ZERO);
  111         if (m == NULL)
  112                 return (NULL);
  113         m->ifen_next = ipxip_list;
  114         ipxip_list = m;
  115         ifp = m->ifen_ifp = if_alloc(IFT_IPXIP);
  116         if (ifp == NULL) {
  117                 FREE(m, M_PCB);
  118                 return (NULL);
  119         }
  120 
  121         if_initname(ifp, "ipxip", ipxipif_units++);
  122         ifp->if_mtu = LOMTU;
  123         ifp->if_ioctl = ipxipioctl;
  124         ifp->if_output = ipxipoutput;
  125         ifp->if_start = ipxipstart;
  126         ifp->if_flags = IFF_POINTOPOINT;
  127         ifp->if_softc = m;
  128         if_attach(ifp);
  129 
  130         return (m);
  131 }
  132 
  133 
  134 /*
  135  * Process an ioctl request.
  136  */
  137 static int
  138 ipxipioctl(ifp, cmd, data)
  139         register struct ifnet *ifp;
  140         u_long cmd;
  141         caddr_t data;
  142 {
  143         int error = 0;
  144         struct ifreq *ifr;
  145 
  146         switch (cmd) {
  147 
  148         case SIOCSIFADDR:
  149                 ifp->if_flags |= IFF_UP;
  150                 /* FALLTHROUGH */
  151 
  152         case SIOCSIFDSTADDR:
  153                 /*
  154                  * Everything else is done at a higher level.
  155                  */
  156                 break;
  157 
  158         case SIOCSIFFLAGS:
  159                 ifr = (struct ifreq *)data;
  160                 if ((ifr->ifr_flags & IFF_UP) == 0)
  161                         error = ipxip_free(ifp);
  162 
  163 
  164         default:
  165                 error = EINVAL;
  166         }
  167         return (error);
  168 }
  169 
  170 static struct mbuf *ipxip_badlen;
  171 static struct mbuf *ipxip_lastin;
  172 static int ipxip_hold_input;
  173 
  174 void
  175 ipxip_input(m, hlen)
  176         register struct mbuf *m;
  177         int hlen;
  178 {
  179         register struct ip *ip;
  180         register struct ipx *ipx;
  181         int len, s;
  182 
  183         if (ipxip_hold_input) {
  184                 if (ipxip_lastin != NULL) {
  185                         m_freem(ipxip_lastin);
  186                 }
  187                 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
  188         }
  189         /*
  190          * Get IP and IPX header together in first mbuf.
  191          */
  192         ipxipif.if_ipackets++;
  193         s = sizeof(struct ip) + sizeof(struct ipx);
  194         if (((m->m_flags & M_EXT) || m->m_len < s) &&
  195             (m = m_pullup(m, s)) == NULL) {
  196                 ipxipif.if_ierrors++;
  197                 return;
  198         }
  199         ip = mtod(m, struct ip *);
  200         if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
  201                 ip_stripoptions(m, (struct mbuf *)NULL);
  202                 if (m->m_len < s) {
  203                         if ((m = m_pullup(m, s)) == NULL) {
  204                                 ipxipif.if_ierrors++;
  205                                 return;
  206                         }
  207                         ip = mtod(m, struct ip *);
  208                 }
  209         }
  210 
  211         /*
  212          * Make mbuf data length reflect IPX length.
  213          * If not enough data to reflect IPX length, drop.
  214          */
  215         m->m_data += sizeof(struct ip);
  216         m->m_len -= sizeof(struct ip);
  217         m->m_pkthdr.len -= sizeof(struct ip);
  218         ipx = mtod(m, struct ipx *);
  219         len = ntohs(ipx->ipx_len);
  220         if (len & 1)
  221                 len++;          /* Preserve Garbage Byte */
  222         if (ip->ip_len != len) {
  223                 if (len > ip->ip_len) {
  224                         ipxipif.if_ierrors++;
  225                         if (ipxip_badlen)
  226                                 m_freem(ipxip_badlen);
  227                         ipxip_badlen = m;
  228                         return;
  229                 }
  230                 /* Any extra will be trimmed off by the IPX routines */
  231         }
  232 
  233         /*
  234          * Deliver to IPX
  235          */
  236         netisr_dispatch(NETISR_IPX, m);
  237 }
  238 
  239 static int
  240 ipxipoutput(ifp, m, dst, rt)
  241         struct ifnet *ifp;
  242         struct mbuf *m;
  243         struct sockaddr *dst;
  244         struct rtentry *rt;
  245 {
  246         register struct ifnet_en *ifn = (struct ifnet_en *)ifp->if_softc;
  247         register struct ip *ip;
  248         register struct route *ro = &(ifn->ifen_route);
  249         register int len = 0;
  250         register struct ipx *ipx = mtod(m, struct ipx *);
  251         int error;
  252 
  253         ifn->ifen_ifp->if_opackets++;
  254         ipxipif.if_opackets++;
  255 
  256         /*
  257          * Calculate data length and make space
  258          * for IP header.
  259          */
  260         len =  ntohs(ipx->ipx_len);
  261         if (len & 1)
  262                 len++;          /* Preserve Garbage Byte */
  263         /* following clause not necessary on vax */
  264         if (3 & (intptr_t)m->m_data) {
  265                 /* force longword alignment of ip hdr */
  266                 struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
  267                 if (m0 == NULL) {
  268                         m_freem(m);
  269                         return (ENOBUFS);
  270                 }
  271                 MH_ALIGN(m0, sizeof(struct ip));
  272                 m0->m_flags = m->m_flags & M_COPYFLAGS;
  273                 m0->m_next = m;
  274                 m0->m_len = sizeof(struct ip);
  275                 m0->m_pkthdr.len = m0->m_len + m->m_len;
  276                 m->m_flags &= ~M_PKTHDR;
  277                 m = m0;
  278         } else {
  279                 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  280                 if (m == NULL)
  281                         return (ENOBUFS);
  282         }
  283         /*
  284          * Fill in IP header.
  285          */
  286         ip = mtod(m, struct ip *);
  287         *(long *)ip = 0;
  288         ip->ip_p = IPPROTO_IDP;
  289         ip->ip_src = ifn->ifen_src;
  290         ip->ip_dst = ifn->ifen_dst;
  291         ip->ip_len = (u_short)len + sizeof(struct ip);
  292         ip->ip_ttl = MAXTTL;
  293 
  294         /*
  295          * Output final datagram.
  296          */
  297         error =  (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL, NULL));
  298         if (error) {
  299                 ifn->ifen_ifp->if_oerrors++;
  300                 ifn->ifen_ifp->if_ierrors = error;
  301         }
  302         return (error);
  303         m_freem(m);
  304         return (ENETUNREACH);
  305 }
  306 
  307 static void
  308 ipxipstart(ifp)
  309 struct ifnet *ifp;
  310 {
  311         panic("ipxip_start called\n");
  312 }
  313 
  314 static struct ifreq ifr_ipxip = {"ipxip0"};
  315 
  316 int
  317 ipxip_route(so, sopt)
  318         struct socket *so;
  319         struct sockopt *sopt;
  320 {
  321         int error;
  322         struct ifnet_en *ifn;
  323         struct sockaddr_in *src;
  324         struct ipxip_req rq;
  325         struct sockaddr_ipx *ipx_dst;
  326         struct sockaddr_in *ip_dst;
  327         struct route ro;
  328 
  329         error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
  330         if (error)
  331                 return (error);
  332         ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
  333         ip_dst = (struct sockaddr_in *)&rq.rq_ip;
  334 
  335         /*
  336          * First, make sure we already have an IPX address:
  337          */
  338         if (ipx_ifaddr == NULL)
  339                 return (EADDRNOTAVAIL);
  340         /*
  341          * Now, determine if we can get to the destination
  342          */
  343         bzero((caddr_t)&ro, sizeof(ro));
  344         ro.ro_dst = *(struct sockaddr *)ip_dst;
  345         rtalloc_ign(&ro, 0);
  346         if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
  347                 return (ENETUNREACH);
  348         }
  349 
  350         /*
  351          * And see how he's going to get back to us:
  352          * i.e., what return ip address do we use?
  353          */
  354         {
  355                 register struct in_ifaddr *ia;
  356                 struct ifnet *ifp = ro.ro_rt->rt_ifp;
  357 
  358                 for (ia = TAILQ_FIRST(&in_ifaddrhead); ia != NULL;
  359                      ia = TAILQ_NEXT(ia, ia_link))
  360                         if (ia->ia_ifp == ifp)
  361                                 break;
  362                 if (ia == NULL)
  363                         ia = TAILQ_FIRST(&in_ifaddrhead);
  364                 if (ia == NULL) {
  365                         RTFREE(ro.ro_rt);
  366                         return (EADDRNOTAVAIL);
  367                 }
  368                 src = (struct sockaddr_in *)&ia->ia_addr;
  369         }
  370 
  371         /*
  372          * Is there a free (pseudo-)interface or space?
  373          */
  374         for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
  375                 if ((ifn->ifen_ifp->if_flags & IFF_UP) == 0)
  376                         break;
  377         }
  378         if (ifn == NULL)
  379                 ifn = ipxipattach();
  380         if (ifn == NULL) {
  381                 RTFREE(ro.ro_rt);
  382                 return (ENOBUFS);
  383         }
  384         ifn->ifen_route = ro;
  385         ifn->ifen_dst =  ip_dst->sin_addr;
  386         ifn->ifen_src = src->sin_addr;
  387 
  388         /*
  389          * now configure this as a point to point link
  390          */
  391         ifr_ipxip.ifr_name[4] = '' + ipxipif_units - 1;
  392         ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
  393         ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
  394                         (struct ifnet *)ifn, sopt->sopt_td);
  395 
  396         /* use any of our addresses */
  397         satoipx_addr(ifr_ipxip.ifr_addr).x_host =
  398                         ipx_ifaddr->ia_addr.sipx_addr.x_host;
  399 
  400         return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
  401                         (struct ifnet *)ifn, sopt->sopt_td));
  402 }
  403 
  404 static int
  405 ipxip_free(ifp)
  406 struct ifnet *ifp;
  407 {
  408         register struct ifnet_en *ifn = (struct ifnet_en *)ifp->if_softc;
  409         struct route *ro = & ifn->ifen_route;
  410 
  411         if (ro->ro_rt != NULL) {
  412                 RTFREE(ro->ro_rt);
  413                 ro->ro_rt = NULL;
  414         }
  415         ifp->if_flags &= ~IFF_UP;
  416         return (0);
  417 }
  418 
  419 void
  420 ipxip_ctlinput(cmd, sa, dummy)
  421         int cmd;
  422         struct sockaddr *sa;
  423         void *dummy;
  424 {
  425         struct sockaddr_in *sin;
  426 
  427         if ((unsigned)cmd >= PRC_NCMDS)
  428                 return;
  429         if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
  430                 return;
  431         sin = (struct sockaddr_in *)sa;
  432         if (sin->sin_addr.s_addr == INADDR_ANY)
  433                 return;
  434 
  435         switch (cmd) {
  436 
  437         case PRC_ROUTEDEAD:
  438         case PRC_REDIRECT_NET:
  439         case PRC_REDIRECT_HOST:
  440         case PRC_REDIRECT_TOSNET:
  441         case PRC_REDIRECT_TOSHOST:
  442                 ipxip_rtchange(&sin->sin_addr);
  443                 break;
  444         }
  445 }
  446 
  447 static void
  448 ipxip_rtchange(dst)
  449         register struct in_addr *dst;
  450 {
  451         register struct ifnet_en *ifn;
  452 
  453         for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
  454                 if (ifn->ifen_dst.s_addr == dst->s_addr &&
  455                         ifn->ifen_route.ro_rt != NULL) {
  456                                 RTFREE(ifn->ifen_route.ro_rt);
  457                                 ifn->ifen_route.ro_rt = NULL;
  458                 }
  459         }
  460 }
  461 #endif /* IPXIP */

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