if_gif.c

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    1 /*      $FreeBSD$       */
    2 /*      $KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $ */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include "opt_inet.h"
   34 #include "opt_inet6.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/kernel.h>
   39 #include <sys/malloc.h>
   40 #include <sys/mbuf.h>
   41 #include <sys/socket.h>
   42 #include <sys/sockio.h>
   43 #include <sys/errno.h>
   44 #include <sys/time.h>
   45 #include <sys/sysctl.h>
   46 #include <sys/syslog.h>
   47 #include <sys/protosw.h>
   48 #include <sys/conf.h>
   49 #include <machine/bus.h>        /* XXX: Shouldn't really be required! */
   50 #include <sys/rman.h>
   51 #include <machine/cpu.h>
   52 
   53 #include <net/if.h>
   54 #include <net/if_types.h>
   55 #include <net/netisr.h>
   56 #include <net/route.h>
   57 #include <net/bpf.h>
   58 
   59 #include <netinet/in.h>
   60 #include <netinet/in_systm.h>
   61 #include <netinet/ip.h>
   62 #ifdef  INET
   63 #include <netinet/in_var.h>
   64 #include <netinet/in_gif.h>
   65 #include <netinet/ip_var.h>
   66 #include <netinet/ipprotosw.h>
   67 #endif  /* INET */
   68 
   69 #ifdef INET6
   70 #ifndef INET
   71 #include <netinet/in.h>
   72 #endif
   73 #include <netinet6/in6_var.h>
   74 #include <netinet/ip6.h>
   75 #include <netinet6/ip6_var.h>
   76 #include <netinet6/in6_gif.h>
   77 #include <netinet6/ip6protosw.h>
   78 #endif /* INET6 */
   79 
   80 #include <netinet/ip_encap.h>
   81 #include <net/if_gif.h>
   82 
   83 #include <net/net_osdep.h>
   84 
   85 #define GIFNAME         "gif"
   86 #define GIFDEV          "if_gif"
   87 #define GIF_MAXUNIT     0x7fff  /* ifp->if_unit is only 15 bits */
   88 
   89 static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
   90 static struct rman gifunits[1];
   91 LIST_HEAD(, gif_softc) gif_softc_list;
   92 
   93 int     gif_clone_create __P((struct if_clone *, int *));
   94 void    gif_clone_destroy __P((struct ifnet *));
   95 
   96 struct if_clone gif_cloner =
   97     IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy);
   98 
   99 static int gifmodevent __P((module_t, int, void *));
  100 
  101 SYSCTL_DECL(_net_link);
  102 SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0,
  103     "Generic Tunnel Interface");
  104 #ifndef MAX_GIF_NEST
  105 /*
  106  * This macro controls the default upper limitation on nesting of gif tunnels.
  107  * Since, setting a large value to this macro with a careless configuration
  108  * may introduce system crash, we don't allow any nestings by default.
  109  * If you need to configure nested gif tunnels, you can define this macro
  110  * in your kernel configuration file.  However, if you do so, please be
  111  * careful to configure the tunnels so that it won't make a loop.
  112  */
  113 #define MAX_GIF_NEST 1
  114 #endif
  115 static int max_gif_nesting = MAX_GIF_NEST;
  116 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW,
  117     &max_gif_nesting, 0, "Max nested tunnels");
  118 
  119 /*
  120  * By default, we disallow creation of multiple tunnels between the same
  121  * pair of addresses.  Some applications require this functionality so
  122  * we allow control over this check here.
  123  */
  124 #ifdef XBONEHACK
  125 static int parallel_tunnels = 1;
  126 #else
  127 static int parallel_tunnels = 0;
  128 #endif
  129 SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW,
  130     &parallel_tunnels, 0, "Allow parallel tunnels?");
  131 
  132 int
  133 gif_clone_create(ifc, unit)
  134         struct if_clone *ifc;
  135         int *unit;
  136 {
  137         struct resource *r;
  138         struct gif_softc *sc;
  139 
  140         if (*unit > GIF_MAXUNIT)
  141                 return (ENXIO);
  142 
  143         if (*unit < 0) {
  144                 r = rman_reserve_resource(gifunits, 0, GIF_MAXUNIT, 1,
  145                     RF_ALLOCATED | RF_ACTIVE, NULL);
  146                 if (r == NULL)
  147                         return (ENOSPC);
  148                 *unit = rman_get_start(r);
  149         } else {
  150                 r = rman_reserve_resource(gifunits, *unit, *unit, 1,
  151                     RF_ALLOCATED | RF_ACTIVE, NULL);
  152                 if (r == NULL)
  153                         return (EEXIST);
  154         }
  155         
  156         sc = malloc (sizeof(struct gif_softc), M_GIF, M_WAITOK);
  157         bzero(sc, sizeof(struct gif_softc));
  158 
  159         sc->gif_if.if_softc = sc;
  160         sc->gif_if.if_name = GIFNAME;
  161         sc->gif_if.if_unit = *unit;
  162         sc->r_unit = r;
  163 
  164         gifattach0(sc);
  165 
  166         LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list);
  167         return (0);
  168 }
  169 
  170 void
  171 gifattach0(sc)
  172         struct gif_softc *sc;
  173 {
  174 
  175         sc->encap_cookie4 = sc->encap_cookie6 = NULL;
  176 
  177         sc->gif_if.if_addrlen = 0;
  178         sc->gif_if.if_mtu    = GIF_MTU;
  179         sc->gif_if.if_flags  = IFF_POINTOPOINT | IFF_MULTICAST;
  180 #if 0
  181         /* turn off ingress filter */
  182         sc->gif_if.if_flags  |= IFF_LINK2;
  183 #endif
  184         sc->gif_if.if_ioctl  = gif_ioctl;
  185         sc->gif_if.if_output = gif_output;
  186         sc->gif_if.if_type   = IFT_GIF;
  187         sc->gif_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
  188         if_attach(&sc->gif_if);
  189         bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int));
  190 }
  191 
  192 void
  193 gif_clone_destroy(ifp)
  194         struct ifnet *ifp;
  195 {
  196         int err;
  197         struct gif_softc *sc = ifp->if_softc;
  198 
  199         gif_delete_tunnel(&sc->gif_if);
  200         LIST_REMOVE(sc, gif_list);
  201 #ifdef INET6
  202         if (sc->encap_cookie6 != NULL) {
  203                 err = encap_detach(sc->encap_cookie6);
  204                 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6"));
  205         }
  206 #endif
  207 #ifdef INET
  208         if (sc->encap_cookie4 != NULL) {
  209                 err = encap_detach(sc->encap_cookie4);
  210                 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4"));
  211         }
  212 #endif
  213 
  214         bpfdetach(ifp);
  215         if_detach(ifp);
  216 
  217         err = rman_release_resource(sc->r_unit);
  218         KASSERT(err == 0, ("Unexpected error freeing resource"));
  219 
  220         free(sc, M_GIF);
  221 }
  222 
  223 static int
  224 gifmodevent(mod, type, data)
  225         module_t mod;
  226         int type;
  227         void *data;
  228 {
  229         int err;
  230 
  231         switch (type) {
  232         case MOD_LOAD:
  233                 gifunits->rm_type = RMAN_ARRAY;
  234                 gifunits->rm_descr = "configurable if_gif units";
  235                 err = rman_init(gifunits);
  236                 if (err != 0)
  237                         return (err);
  238                 err = rman_manage_region(gifunits, 0, GIF_MAXUNIT);
  239                 if (err != 0) {
  240                         printf("%s: gifunits: rman_manage_region: Failed %d\n",
  241                             GIFNAME, err);
  242                         rman_fini(gifunits);
  243                         return (err);
  244                 }
  245                 LIST_INIT(&gif_softc_list);
  246                 if_clone_attach(&gif_cloner);
  247 
  248 #ifdef INET6
  249                 ip6_gif_hlim = GIF_HLIM;
  250 #endif
  251 
  252                 break;
  253         case MOD_UNLOAD:
  254                 if_clone_detach(&gif_cloner);
  255 
  256                 while (!LIST_EMPTY(&gif_softc_list))
  257                         gif_clone_destroy(&LIST_FIRST(&gif_softc_list)->gif_if);
  258 
  259                 err = rman_fini(gifunits);
  260                 if (err != 0)
  261                         return (err);
  262 #ifdef INET6
  263                 ip6_gif_hlim = 0;
  264 #endif
  265                 break;
  266         }
  267         return 0;
  268 }
  269 
  270 static moduledata_t gif_mod = {
  271         "if_gif",
  272         gifmodevent,
  273         0
  274 };
  275 
  276 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  277 
  278 int
  279 gif_encapcheck(m, off, proto, arg)
  280         const struct mbuf *m;
  281         int off;
  282         int proto;
  283         void *arg;
  284 {
  285         struct ip ip;
  286         struct gif_softc *sc;
  287 
  288         sc = (struct gif_softc *)arg;
  289         if (sc == NULL)
  290                 return 0;
  291 
  292         if ((sc->gif_if.if_flags & IFF_UP) == 0)
  293                 return 0;
  294 
  295         /* no physical address */
  296         if (!sc->gif_psrc || !sc->gif_pdst)
  297                 return 0;
  298 
  299         switch (proto) {
  300 #ifdef INET
  301         case IPPROTO_IPV4:
  302                 break;
  303 #endif
  304 #ifdef INET6
  305         case IPPROTO_IPV6:
  306                 break;
  307 #endif
  308         default:
  309                 return 0;
  310         }
  311 
  312         /* Bail on short packets */
  313         if (m->m_pkthdr.len < sizeof(ip))
  314                 return 0;
  315 
  316         /* LINTED const cast */
  317         m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
  318 
  319         switch (ip.ip_v) {
  320 #ifdef INET
  321         case 4:
  322                 if (sc->gif_psrc->sa_family != AF_INET ||
  323                     sc->gif_pdst->sa_family != AF_INET)
  324                         return 0;
  325                 return gif_encapcheck4(m, off, proto, arg);
  326 #endif
  327 #ifdef INET6
  328         case 6:
  329                 if (m->m_pkthdr.len < sizeof(struct ip6_hdr))
  330                         return 0;
  331                 if (sc->gif_psrc->sa_family != AF_INET6 ||
  332                     sc->gif_pdst->sa_family != AF_INET6)
  333                         return 0;
  334                 return gif_encapcheck6(m, off, proto, arg);
  335 #endif
  336         default:
  337                 return 0;
  338         }
  339 }
  340 
  341 int
  342 gif_output(ifp, m, dst, rt)
  343         struct ifnet *ifp;
  344         struct mbuf *m;
  345         struct sockaddr *dst;
  346         struct rtentry *rt;     /* added in net2 */
  347 {
  348         struct gif_softc *sc = (struct gif_softc*)ifp;
  349         int error = 0;
  350         static int called = 0;  /* XXX: MUTEX */
  351 
  352         /*
  353          * gif may cause infinite recursion calls when misconfigured.
  354          * We'll prevent this by introducing upper limit.
  355          * XXX: this mechanism may introduce another problem about
  356          *      mutual exclusion of the variable CALLED, especially if we
  357          *      use kernel thread.
  358          */
  359         if (++called > max_gif_nesting) {
  360                 log(LOG_NOTICE,
  361                     "gif_output: recursively called too many times(%d)\n",
  362                     called);
  363                 m_freem(m);
  364                 error = EIO;    /* is there better errno? */
  365                 goto end;
  366         }
  367 
  368         m->m_flags &= ~(M_BCAST|M_MCAST);
  369         if (!(ifp->if_flags & IFF_UP) ||
  370             sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
  371                 m_freem(m);
  372                 error = ENETDOWN;
  373                 goto end;
  374         }
  375 
  376         if (ifp->if_bpf) {
  377                 /*
  378                  * We need to prepend the address family as
  379                  * a four byte field.  Cons up a dummy header
  380                  * to pacify bpf.  This is safe because bpf
  381                  * will only read from the mbuf (i.e., it won't
  382                  * try to free it or keep a pointer a to it).
  383                  */
  384                 struct mbuf m0;
  385                 u_int32_t af = dst->sa_family;
  386 
  387                 m0.m_next = m;
  388                 m0.m_len = 4;
  389                 m0.m_data = (char *)&af;
  390                 
  391                 bpf_mtap(ifp, &m0);
  392         }
  393         ifp->if_opackets++;     
  394         ifp->if_obytes += m->m_pkthdr.len;
  395 
  396         /* inner AF-specific encapsulation */
  397 
  398         /* XXX should we check if our outer source is legal? */
  399 
  400         /* dispatch to output logic based on outer AF */
  401         switch (sc->gif_psrc->sa_family) {
  402 #ifdef INET
  403         case AF_INET:
  404                 error = in_gif_output(ifp, dst->sa_family, m);
  405                 break;
  406 #endif
  407 #ifdef INET6
  408         case AF_INET6:
  409                 error = in6_gif_output(ifp, dst->sa_family, m);
  410                 break;
  411 #endif
  412         default:
  413                 m_freem(m);             
  414                 error = ENETDOWN;
  415                 goto end;
  416         }
  417 
  418   end:
  419         called = 0;             /* reset recursion counter */
  420         if (error)
  421                 ifp->if_oerrors++;
  422         return error;
  423 }
  424 
  425 void
  426 gif_input(m, af, ifp)
  427         struct mbuf *m;
  428         int af;
  429         struct ifnet *ifp;
  430 {
  431         int s, isr;
  432         struct ifqueue *ifq = NULL;
  433 
  434         if (ifp == NULL) {
  435                 /* just in case */
  436                 m_freem(m);
  437                 return;
  438         }
  439 
  440         m->m_pkthdr.rcvif = ifp;
  441         
  442         if (ifp->if_bpf) {
  443                 /*
  444                  * We need to prepend the address family as
  445                  * a four byte field.  Cons up a dummy header
  446                  * to pacify bpf.  This is safe because bpf
  447                  * will only read from the mbuf (i.e., it won't
  448                  * try to free it or keep a pointer a to it).
  449                  */
  450                 struct mbuf m0;
  451                 u_int32_t af1 = af;
  452                 
  453                 m0.m_next = m;
  454                 m0.m_len = 4;
  455                 m0.m_data = (char *)&af1;
  456                 
  457                 bpf_mtap(ifp, &m0);
  458         }
  459 
  460         /*
  461          * Put the packet to the network layer input queue according to the
  462          * specified address family.
  463          * Note: older versions of gif_input directly called network layer
  464          * input functions, e.g. ip6_input, here.  We changed the policy to
  465          * prevent too many recursive calls of such input functions, which
  466          * might cause kernel panic.  But the change may introduce another
  467          * problem; if the input queue is full, packets are discarded.
  468          * The kernel stack overflow really happened, and we believed
  469          * queue-full rarely occurs, so we changed the policy.
  470          */
  471         switch (af) {
  472 #ifdef INET
  473         case AF_INET:
  474                 ifq = &ipintrq;
  475                 isr = NETISR_IP;
  476                 break;
  477 #endif
  478 #ifdef INET6
  479         case AF_INET6:
  480                 ifq = &ip6intrq;
  481                 isr = NETISR_IPV6;
  482                 break;
  483 #endif
  484         default:
  485                 m_freem(m);
  486                 return;
  487         }
  488 
  489         s = splimp();
  490         if (IF_QFULL(ifq)) {
  491                 IF_DROP(ifq);   /* update statistics */
  492                 m_freem(m);
  493                 splx(s);
  494                 return;
  495         }
  496         ifp->if_ipackets++;
  497         ifp->if_ibytes += m->m_pkthdr.len;
  498         IF_ENQUEUE(ifq, m);
  499         /* we need schednetisr since the address family may change */
  500         schednetisr(isr);
  501         splx(s);
  502 
  503         return;
  504 }
  505 
  506 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
  507 int
  508 gif_ioctl(ifp, cmd, data)
  509         struct ifnet *ifp;
  510         u_long cmd;
  511         caddr_t data;
  512 {
  513         struct gif_softc *sc  = (struct gif_softc*)ifp;
  514         struct ifreq     *ifr = (struct ifreq*)data;
  515         int error = 0, size;
  516         struct sockaddr *dst, *src;
  517 #ifdef  SIOCSIFMTU /* xxx */
  518         u_long mtu;
  519 #endif
  520 
  521         switch (cmd) {
  522         case SIOCSIFADDR:
  523                 ifp->if_flags |= IFF_UP;
  524                 break;
  525                 
  526         case SIOCSIFDSTADDR:
  527                 break;
  528 
  529         case SIOCADDMULTI:
  530         case SIOCDELMULTI:
  531                 break;
  532 
  533 #ifdef  SIOCSIFMTU /* xxx */
  534         case SIOCGIFMTU:
  535                 break;
  536 
  537         case SIOCSIFMTU:
  538                 mtu = ifr->ifr_mtu;
  539                 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX)
  540                         return (EINVAL);
  541                 ifp->if_mtu = mtu;
  542                 break;
  543 #endif /* SIOCSIFMTU */
  544 
  545 #ifdef INET
  546         case SIOCSIFPHYADDR:
  547 #endif
  548 #ifdef INET6
  549         case SIOCSIFPHYADDR_IN6:
  550 #endif /* INET6 */
  551         case SIOCSLIFPHYADDR:
  552                 switch (cmd) {
  553 #ifdef INET
  554                 case SIOCSIFPHYADDR:
  555                         src = (struct sockaddr *)
  556                                 &(((struct in_aliasreq *)data)->ifra_addr);
  557                         dst = (struct sockaddr *)
  558                                 &(((struct in_aliasreq *)data)->ifra_dstaddr);
  559                         break;
  560 #endif
  561 #ifdef INET6
  562                 case SIOCSIFPHYADDR_IN6:
  563                         src = (struct sockaddr *)
  564                                 &(((struct in6_aliasreq *)data)->ifra_addr);
  565                         dst = (struct sockaddr *)
  566                                 &(((struct in6_aliasreq *)data)->ifra_dstaddr);
  567                         break;
  568 #endif
  569                 case SIOCSLIFPHYADDR:
  570                         src = (struct sockaddr *)
  571                                 &(((struct if_laddrreq *)data)->addr);
  572                         dst = (struct sockaddr *)
  573                                 &(((struct if_laddrreq *)data)->dstaddr);
  574                         break;
  575                 default:
  576                         return EINVAL;
  577                 }
  578 
  579                 /* sa_family must be equal */
  580                 if (src->sa_family != dst->sa_family)
  581                         return EINVAL;
  582 
  583                 /* validate sa_len */
  584                 switch (src->sa_family) {
  585 #ifdef INET
  586                 case AF_INET:
  587                         if (src->sa_len != sizeof(struct sockaddr_in))
  588                                 return EINVAL;
  589                         break;
  590 #endif
  591 #ifdef INET6
  592                 case AF_INET6:
  593                         if (src->sa_len != sizeof(struct sockaddr_in6))
  594                                 return EINVAL;
  595                         break;
  596 #endif
  597                 default:
  598                         return EAFNOSUPPORT;
  599                 }
  600                 switch (dst->sa_family) {
  601 #ifdef INET
  602                 case AF_INET:
  603                         if (dst->sa_len != sizeof(struct sockaddr_in))
  604                                 return EINVAL;
  605                         break;
  606 #endif
  607 #ifdef INET6
  608                 case AF_INET6:
  609                         if (dst->sa_len != sizeof(struct sockaddr_in6))
  610                                 return EINVAL;
  611                         break;
  612 #endif
  613                 default:
  614                         return EAFNOSUPPORT;
  615                 }
  616 
  617                 /* check sa_family looks sane for the cmd */
  618                 switch (cmd) {
  619                 case SIOCSIFPHYADDR:
  620                         if (src->sa_family == AF_INET)
  621                                 break;
  622                         return EAFNOSUPPORT;
  623 #ifdef INET6
  624                 case SIOCSIFPHYADDR_IN6:
  625                         if (src->sa_family == AF_INET6)
  626                                 break;
  627                         return EAFNOSUPPORT;
  628 #endif /* INET6 */
  629                 case SIOCSLIFPHYADDR:
  630                         /* checks done in the above */
  631                         break;
  632                 }
  633 
  634                 error = gif_set_tunnel(&sc->gif_if, src, dst);
  635                 break;
  636 
  637 #ifdef SIOCDIFPHYADDR
  638         case SIOCDIFPHYADDR:
  639                 gif_delete_tunnel(&sc->gif_if);
  640                 break;
  641 #endif
  642                         
  643         case SIOCGIFPSRCADDR:
  644 #ifdef INET6
  645         case SIOCGIFPSRCADDR_IN6:
  646 #endif /* INET6 */
  647                 if (sc->gif_psrc == NULL) {
  648                         error = EADDRNOTAVAIL;
  649                         goto bad;
  650                 }
  651                 src = sc->gif_psrc;
  652                 switch (cmd) {
  653 #ifdef INET
  654                 case SIOCGIFPSRCADDR:
  655                         dst = &ifr->ifr_addr;
  656                         size = sizeof(ifr->ifr_addr);
  657                         break;
  658 #endif /* INET */
  659 #ifdef INET6
  660                 case SIOCGIFPSRCADDR_IN6:
  661                         dst = (struct sockaddr *)
  662                                 &(((struct in6_ifreq *)data)->ifr_addr);
  663                         size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
  664                         break;
  665 #endif /* INET6 */
  666                 default:
  667                         error = EADDRNOTAVAIL;
  668                         goto bad;
  669                 }
  670                 if (src->sa_len > size)
  671                         return EINVAL;
  672                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
  673                 break;
  674                         
  675         case SIOCGIFPDSTADDR:
  676 #ifdef INET6
  677         case SIOCGIFPDSTADDR_IN6:
  678 #endif /* INET6 */
  679                 if (sc->gif_pdst == NULL) {
  680                         error = EADDRNOTAVAIL;
  681                         goto bad;
  682                 }
  683                 src = sc->gif_pdst;
  684                 switch (cmd) {
  685 #ifdef INET
  686                 case SIOCGIFPDSTADDR:
  687                         dst = &ifr->ifr_addr;
  688                         size = sizeof(ifr->ifr_addr);
  689                         break;
  690 #endif /* INET */
  691 #ifdef INET6
  692                 case SIOCGIFPDSTADDR_IN6:
  693                         dst = (struct sockaddr *)
  694                                 &(((struct in6_ifreq *)data)->ifr_addr);
  695                         size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
  696                         break;
  697 #endif /* INET6 */
  698                 default:
  699                         error = EADDRNOTAVAIL;
  700                         goto bad;
  701                 }
  702                 if (src->sa_len > size)
  703                         return EINVAL;
  704                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
  705                 break;
  706 
  707         case SIOCGLIFPHYADDR:
  708                 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
  709                         error = EADDRNOTAVAIL;
  710                         goto bad;
  711                 }
  712 
  713                 /* copy src */
  714                 src = sc->gif_psrc;
  715                 dst = (struct sockaddr *)
  716                         &(((struct if_laddrreq *)data)->addr);
  717                 size = sizeof(((struct if_laddrreq *)data)->addr);
  718                 if (src->sa_len > size)
  719                         return EINVAL;
  720                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
  721 
  722                 /* copy dst */
  723                 src = sc->gif_pdst;
  724                 dst = (struct sockaddr *)
  725                         &(((struct if_laddrreq *)data)->dstaddr);
  726                 size = sizeof(((struct if_laddrreq *)data)->dstaddr);
  727                 if (src->sa_len > size)
  728                         return EINVAL;
  729                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
  730                 break;
  731 
  732         case SIOCSIFFLAGS:
  733                 /* if_ioctl() takes care of it */
  734                 break;
  735 
  736         default:
  737                 error = EINVAL;
  738                 break;
  739         }
  740  bad:
  741         return error;
  742 }
  743 
  744 int
  745 gif_set_tunnel(ifp, src, dst)
  746         struct ifnet *ifp;
  747         struct sockaddr *src;
  748         struct sockaddr *dst;
  749 {
  750         struct gif_softc *sc = (struct gif_softc *)ifp;
  751         struct gif_softc *sc2;
  752         struct sockaddr *osrc, *odst, *sa;
  753         int s;
  754         int error = 0; 
  755 
  756         s = splnet();
  757 
  758         LIST_FOREACH(sc2, &gif_softc_list, gif_list) {
  759                 if (sc2 == sc)
  760                         continue;
  761                 if (!sc2->gif_pdst || !sc2->gif_psrc)
  762                         continue;
  763                 if (sc2->gif_pdst->sa_family != dst->sa_family ||
  764                     sc2->gif_pdst->sa_len != dst->sa_len ||
  765                     sc2->gif_psrc->sa_family != src->sa_family ||
  766                     sc2->gif_psrc->sa_len != src->sa_len)
  767                         continue;
  768 
  769                 /*
  770                  * Disallow parallel tunnels unless instructed
  771                  * otherwise.
  772                  */
  773                 if (!parallel_tunnels &&
  774                     bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
  775                     bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
  776                         error = EADDRNOTAVAIL;
  777                         goto bad;
  778                 }
  779 
  780                 /* XXX both end must be valid? (I mean, not 0.0.0.0) */
  781         }
  782 
  783         /* XXX we can detach from both, but be polite just in case */
  784         if (sc->gif_psrc)
  785                 switch (sc->gif_psrc->sa_family) {
  786 #ifdef INET
  787                 case AF_INET:
  788                         (void)in_gif_detach(sc);
  789                         break;
  790 #endif
  791 #ifdef INET6
  792                 case AF_INET6:
  793                         (void)in6_gif_detach(sc);
  794                         break;
  795 #endif
  796                 }
  797 
  798         osrc = sc->gif_psrc;
  799         sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK);
  800         bcopy((caddr_t)src, (caddr_t)sa, src->sa_len);
  801         sc->gif_psrc = sa;
  802 
  803         odst = sc->gif_pdst;
  804         sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK);
  805         bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len);
  806         sc->gif_pdst = sa;
  807 
  808         switch (sc->gif_psrc->sa_family) {
  809 #ifdef INET
  810         case AF_INET:
  811                 error = in_gif_attach(sc);
  812                 break;
  813 #endif
  814 #ifdef INET6
  815         case AF_INET6:
  816                 error = in6_gif_attach(sc);
  817                 break;
  818 #endif
  819         }
  820         if (error) {
  821                 /* rollback */
  822                 free((caddr_t)sc->gif_psrc, M_IFADDR);
  823                 free((caddr_t)sc->gif_pdst, M_IFADDR);
  824                 sc->gif_psrc = osrc;
  825                 sc->gif_pdst = odst;
  826                 goto bad;
  827         }
  828 
  829         if (osrc)
  830                 free((caddr_t)osrc, M_IFADDR);
  831         if (odst)
  832                 free((caddr_t)odst, M_IFADDR);
  833 
  834         if (sc->gif_psrc && sc->gif_pdst)
  835                 ifp->if_flags |= IFF_RUNNING;
  836         else
  837                 ifp->if_flags &= ~IFF_RUNNING;
  838         splx(s);
  839 
  840         return 0;
  841 
  842  bad:
  843         if (sc->gif_psrc && sc->gif_pdst)
  844                 ifp->if_flags |= IFF_RUNNING;
  845         else
  846                 ifp->if_flags &= ~IFF_RUNNING;
  847         splx(s);
  848 
  849         return error;
  850 }
  851 
  852 void
  853 gif_delete_tunnel(ifp)
  854         struct ifnet *ifp;
  855 {
  856         struct gif_softc *sc = (struct gif_softc *)ifp;
  857         int s;
  858 
  859         s = splnet();
  860 
  861         if (sc->gif_psrc) {
  862                 free((caddr_t)sc->gif_psrc, M_IFADDR);
  863                 sc->gif_psrc = NULL;
  864         }
  865         if (sc->gif_pdst) {
  866                 free((caddr_t)sc->gif_pdst, M_IFADDR);
  867                 sc->gif_pdst = NULL;
  868         }
  869         /* it is safe to detach from both */
  870 #ifdef INET
  871         (void)in_gif_detach(sc);
  872 #endif
  873 #ifdef INET6
  874         (void)in6_gif_detach(sc);
  875 #endif
  876 
  877         if (sc->gif_psrc && sc->gif_pdst)
  878                 ifp->if_flags |= IFF_RUNNING;
  879         else
  880                 ifp->if_flags &= ~IFF_RUNNING;
  881         splx(s);
  882 }
Cache object: 3d6117d7d2ecaee4d6473af8bb51e260
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FreeBSD/Linux Kernel Cross Reference sys/net/if_gif.c

FreeBSD/Linux Kernel Cross Reference
sys/net/if_gif.c
