The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net/if_gif.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    5  * Copyright (c) 2018 Andrey V. Elsukov <ae@FreeBSD.org>
    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  *      $KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include "opt_inet.h"
   39 #include "opt_inet6.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/kernel.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/module.h>
   48 #include <sys/rmlock.h>
   49 #include <sys/socket.h>
   50 #include <sys/sockio.h>
   51 #include <sys/sx.h>
   52 #include <sys/errno.h>
   53 #include <sys/time.h>
   54 #include <sys/sysctl.h>
   55 #include <sys/syslog.h>
   56 #include <sys/priv.h>
   57 #include <sys/proc.h>
   58 #include <sys/conf.h>
   59 #include <machine/cpu.h>
   60 
   61 #include <net/if.h>
   62 #include <net/if_var.h>
   63 #include <net/if_clone.h>
   64 #include <net/if_types.h>
   65 #include <net/netisr.h>
   66 #include <net/route.h>
   67 #include <net/bpf.h>
   68 #include <net/vnet.h>
   69 
   70 #include <netinet/in.h>
   71 #include <netinet/in_systm.h>
   72 #include <netinet/ip.h>
   73 #include <netinet/ip_ecn.h>
   74 #ifdef  INET
   75 #include <netinet/in_var.h>
   76 #include <netinet/ip_var.h>
   77 #endif  /* INET */
   78 
   79 #ifdef INET6
   80 #ifndef INET
   81 #include <netinet/in.h>
   82 #endif
   83 #include <netinet6/in6_var.h>
   84 #include <netinet/ip6.h>
   85 #include <netinet6/ip6_ecn.h>
   86 #include <netinet6/ip6_var.h>
   87 #endif /* INET6 */
   88 
   89 #include <netinet/ip_encap.h>
   90 #include <net/ethernet.h>
   91 #include <net/if_bridgevar.h>
   92 #include <net/if_gif.h>
   93 
   94 #include <security/mac/mac_framework.h>
   95 
   96 static const char gifname[] = "gif";
   97 
   98 MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
   99 static struct sx gif_ioctl_sx;
  100 SX_SYSINIT(gif_ioctl_sx, &gif_ioctl_sx, "gif_ioctl");
  101 
  102 void    (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af);
  103 void    (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af);
  104 void    (*ng_gif_attach_p)(struct ifnet *ifp);
  105 void    (*ng_gif_detach_p)(struct ifnet *ifp);
  106 
  107 #ifdef VIMAGE
  108 static void     gif_reassign(struct ifnet *, struct vnet *, char *);
  109 #endif
  110 static void     gif_delete_tunnel(struct gif_softc *);
  111 static int      gif_ioctl(struct ifnet *, u_long, caddr_t);
  112 static int      gif_transmit(struct ifnet *, struct mbuf *);
  113 static void     gif_qflush(struct ifnet *);
  114 static int      gif_clone_create(struct if_clone *, int, caddr_t);
  115 static void     gif_clone_destroy(struct ifnet *);
  116 VNET_DEFINE_STATIC(struct if_clone *, gif_cloner);
  117 #define V_gif_cloner    VNET(gif_cloner)
  118 
  119 SYSCTL_DECL(_net_link);
  120 static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0,
  121     "Generic Tunnel Interface");
  122 #ifndef MAX_GIF_NEST
  123 /*
  124  * This macro controls the default upper limitation on nesting of gif tunnels.
  125  * Since, setting a large value to this macro with a careless configuration
  126  * may introduce system crash, we don't allow any nestings by default.
  127  * If you need to configure nested gif tunnels, you can define this macro
  128  * in your kernel configuration file.  However, if you do so, please be
  129  * careful to configure the tunnels so that it won't make a loop.
  130  */
  131 #define MAX_GIF_NEST 1
  132 #endif
  133 VNET_DEFINE_STATIC(int, max_gif_nesting) = MAX_GIF_NEST;
  134 #define V_max_gif_nesting       VNET(max_gif_nesting)
  135 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
  136     &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels");
  137 
  138 static int
  139 gif_clone_create(struct if_clone *ifc, int unit, caddr_t params)
  140 {
  141         struct gif_softc *sc;
  142 
  143         sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO);
  144         sc->gif_fibnum = curthread->td_proc->p_fibnum;
  145         GIF2IFP(sc) = if_alloc(IFT_GIF);
  146         GIF2IFP(sc)->if_softc = sc;
  147         if_initname(GIF2IFP(sc), gifname, unit);
  148 
  149         GIF2IFP(sc)->if_addrlen = 0;
  150         GIF2IFP(sc)->if_mtu    = GIF_MTU;
  151         GIF2IFP(sc)->if_flags  = IFF_POINTOPOINT | IFF_MULTICAST;
  152         GIF2IFP(sc)->if_ioctl  = gif_ioctl;
  153         GIF2IFP(sc)->if_transmit = gif_transmit;
  154         GIF2IFP(sc)->if_qflush = gif_qflush;
  155         GIF2IFP(sc)->if_output = gif_output;
  156 #ifdef VIMAGE
  157         GIF2IFP(sc)->if_reassign = gif_reassign;
  158 #endif
  159         GIF2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
  160         GIF2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
  161         if_attach(GIF2IFP(sc));
  162         bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t));
  163         if (ng_gif_attach_p != NULL)
  164                 (*ng_gif_attach_p)(GIF2IFP(sc));
  165 
  166         return (0);
  167 }
  168 
  169 #ifdef VIMAGE
  170 static void
  171 gif_reassign(struct ifnet *ifp, struct vnet *new_vnet __unused,
  172     char *unused __unused)
  173 {
  174         struct gif_softc *sc;
  175 
  176         sx_xlock(&gif_ioctl_sx);
  177         sc = ifp->if_softc;
  178         if (sc != NULL)
  179                 gif_delete_tunnel(sc);
  180         sx_xunlock(&gif_ioctl_sx);
  181 }
  182 #endif /* VIMAGE */
  183 
  184 static void
  185 gif_clone_destroy(struct ifnet *ifp)
  186 {
  187         struct gif_softc *sc;
  188 
  189         sx_xlock(&gif_ioctl_sx);
  190         sc = ifp->if_softc;
  191         gif_delete_tunnel(sc);
  192         if (ng_gif_detach_p != NULL)
  193                 (*ng_gif_detach_p)(ifp);
  194         bpfdetach(ifp);
  195         if_detach(ifp);
  196         ifp->if_softc = NULL;
  197         sx_xunlock(&gif_ioctl_sx);
  198 
  199         GIF_WAIT();
  200         if_free(ifp);
  201         free(sc, M_GIF);
  202 }
  203 
  204 static void
  205 vnet_gif_init(const void *unused __unused)
  206 {
  207 
  208         V_gif_cloner = if_clone_simple(gifname, gif_clone_create,
  209             gif_clone_destroy, 0);
  210 #ifdef INET
  211         in_gif_init();
  212 #endif
  213 #ifdef INET6
  214         in6_gif_init();
  215 #endif
  216 }
  217 VNET_SYSINIT(vnet_gif_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  218     vnet_gif_init, NULL);
  219 
  220 static void
  221 vnet_gif_uninit(const void *unused __unused)
  222 {
  223 
  224         if_clone_detach(V_gif_cloner);
  225 #ifdef INET
  226         in_gif_uninit();
  227 #endif
  228 #ifdef INET6
  229         in6_gif_uninit();
  230 #endif
  231 }
  232 VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
  233     vnet_gif_uninit, NULL);
  234 
  235 static int
  236 gifmodevent(module_t mod, int type, void *data)
  237 {
  238 
  239         switch (type) {
  240         case MOD_LOAD:
  241         case MOD_UNLOAD:
  242                 break;
  243         default:
  244                 return (EOPNOTSUPP);
  245         }
  246         return (0);
  247 }
  248 
  249 static moduledata_t gif_mod = {
  250         "if_gif",
  251         gifmodevent,
  252         0
  253 };
  254 
  255 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  256 MODULE_VERSION(if_gif, 1);
  257 
  258 struct gif_list *
  259 gif_hashinit(void)
  260 {
  261         struct gif_list *hash;
  262         int i;
  263 
  264         hash = malloc(sizeof(struct gif_list) * GIF_HASH_SIZE,
  265             M_GIF, M_WAITOK);
  266         for (i = 0; i < GIF_HASH_SIZE; i++)
  267                 CK_LIST_INIT(&hash[i]);
  268 
  269         return (hash);
  270 }
  271 
  272 void
  273 gif_hashdestroy(struct gif_list *hash)
  274 {
  275 
  276         free(hash, M_GIF);
  277 }
  278 
  279 #define MTAG_GIF        1080679712
  280 static int
  281 gif_transmit(struct ifnet *ifp, struct mbuf *m)
  282 {
  283         struct gif_softc *sc;
  284         struct etherip_header *eth;
  285 #ifdef INET
  286         struct ip *ip;
  287 #endif
  288 #ifdef INET6
  289         struct ip6_hdr *ip6;
  290         uint32_t t;
  291 #endif
  292         uint32_t af;
  293         uint8_t proto, ecn;
  294         int error;
  295 
  296         GIF_RLOCK();
  297 #ifdef MAC
  298         error = mac_ifnet_check_transmit(ifp, m);
  299         if (error) {
  300                 m_freem(m);
  301                 goto err;
  302         }
  303 #endif
  304         error = ENETDOWN;
  305         sc = ifp->if_softc;
  306         if ((ifp->if_flags & IFF_MONITOR) != 0 ||
  307             (ifp->if_flags & IFF_UP) == 0 ||
  308             (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
  309             sc->gif_family == 0 ||
  310             (error = if_tunnel_check_nesting(ifp, m, MTAG_GIF,
  311                 V_max_gif_nesting)) != 0) {
  312                 m_freem(m);
  313                 goto err;
  314         }
  315         /* Now pull back the af that we stashed in the csum_data. */
  316         if (ifp->if_bridge)
  317                 af = AF_LINK;
  318         else
  319                 af = m->m_pkthdr.csum_data;
  320         m->m_flags &= ~(M_BCAST|M_MCAST);
  321         M_SETFIB(m, sc->gif_fibnum);
  322         BPF_MTAP2(ifp, &af, sizeof(af), m);
  323         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  324         if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
  325         /* inner AF-specific encapsulation */
  326         ecn = 0;
  327         switch (af) {
  328 #ifdef INET
  329         case AF_INET:
  330                 proto = IPPROTO_IPV4;
  331                 if (m->m_len < sizeof(struct ip))
  332                         m = m_pullup(m, sizeof(struct ip));
  333                 if (m == NULL) {
  334                         error = ENOBUFS;
  335                         goto err;
  336                 }
  337                 ip = mtod(m, struct ip *);
  338                 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  339                     ECN_NOCARE, &ecn, &ip->ip_tos);
  340                 break;
  341 #endif
  342 #ifdef INET6
  343         case AF_INET6:
  344                 proto = IPPROTO_IPV6;
  345                 if (m->m_len < sizeof(struct ip6_hdr))
  346                         m = m_pullup(m, sizeof(struct ip6_hdr));
  347                 if (m == NULL) {
  348                         error = ENOBUFS;
  349                         goto err;
  350                 }
  351                 t = 0;
  352                 ip6 = mtod(m, struct ip6_hdr *);
  353                 ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  354                     ECN_NOCARE, &t, &ip6->ip6_flow);
  355                 ecn = (ntohl(t) >> 20) & 0xff;
  356                 break;
  357 #endif
  358         case AF_LINK:
  359                 proto = IPPROTO_ETHERIP;
  360                 M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT);
  361                 if (m == NULL) {
  362                         error = ENOBUFS;
  363                         goto err;
  364                 }
  365                 eth = mtod(m, struct etherip_header *);
  366                 eth->eip_resvh = 0;
  367                 eth->eip_ver = ETHERIP_VERSION;
  368                 eth->eip_resvl = 0;
  369                 break;
  370         default:
  371                 error = EAFNOSUPPORT;
  372                 m_freem(m);
  373                 goto err;
  374         }
  375         /* XXX should we check if our outer source is legal? */
  376         /* dispatch to output logic based on outer AF */
  377         switch (sc->gif_family) {
  378 #ifdef INET
  379         case AF_INET:
  380                 error = in_gif_output(ifp, m, proto, ecn);
  381                 break;
  382 #endif
  383 #ifdef INET6
  384         case AF_INET6:
  385                 error = in6_gif_output(ifp, m, proto, ecn);
  386                 break;
  387 #endif
  388         default:
  389                 m_freem(m);
  390         }
  391 err:
  392         if (error)
  393                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  394         GIF_RUNLOCK();
  395         return (error);
  396 }
  397 
  398 static void
  399 gif_qflush(struct ifnet *ifp __unused)
  400 {
  401 
  402 }
  403 
  404 
  405 int
  406 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
  407         struct route *ro)
  408 {
  409         uint32_t af;
  410 
  411         if (dst->sa_family == AF_UNSPEC)
  412                 bcopy(dst->sa_data, &af, sizeof(af));
  413         else
  414                 af = dst->sa_family;
  415         /*
  416          * Now save the af in the inbound pkt csum data, this is a cheat since
  417          * we are using the inbound csum_data field to carry the af over to
  418          * the gif_transmit() routine, avoiding using yet another mtag.
  419          */
  420         m->m_pkthdr.csum_data = af;
  421         return (ifp->if_transmit(ifp, m));
  422 }
  423 
  424 void
  425 gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn)
  426 {
  427         struct etherip_header *eip;
  428 #ifdef INET
  429         struct ip *ip;
  430 #endif
  431 #ifdef INET6
  432         struct ip6_hdr *ip6;
  433         uint32_t t;
  434 #endif
  435         struct ether_header *eh;
  436         struct ifnet *oldifp;
  437         int isr, n, af;
  438 
  439         if (ifp == NULL) {
  440                 /* just in case */
  441                 m_freem(m);
  442                 return;
  443         }
  444         m->m_pkthdr.rcvif = ifp;
  445         m_clrprotoflags(m);
  446         switch (proto) {
  447 #ifdef INET
  448         case IPPROTO_IPV4:
  449                 af = AF_INET;
  450                 if (m->m_len < sizeof(struct ip))
  451                         m = m_pullup(m, sizeof(struct ip));
  452                 if (m == NULL)
  453                         goto drop;
  454                 ip = mtod(m, struct ip *);
  455                 if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  456                     ECN_NOCARE, &ecn, &ip->ip_tos) == 0) {
  457                         m_freem(m);
  458                         goto drop;
  459                 }
  460                 break;
  461 #endif
  462 #ifdef INET6
  463         case IPPROTO_IPV6:
  464                 af = AF_INET6;
  465                 if (m->m_len < sizeof(struct ip6_hdr))
  466                         m = m_pullup(m, sizeof(struct ip6_hdr));
  467                 if (m == NULL)
  468                         goto drop;
  469                 t = htonl((uint32_t)ecn << 20);
  470                 ip6 = mtod(m, struct ip6_hdr *);
  471                 if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  472                     ECN_NOCARE, &t, &ip6->ip6_flow) == 0) {
  473                         m_freem(m);
  474                         goto drop;
  475                 }
  476                 break;
  477 #endif
  478         case IPPROTO_ETHERIP:
  479                 af = AF_LINK;
  480                 break;
  481         default:
  482                 m_freem(m);
  483                 goto drop;
  484         }
  485 
  486 #ifdef MAC
  487         mac_ifnet_create_mbuf(ifp, m);
  488 #endif
  489 
  490         if (bpf_peers_present(ifp->if_bpf)) {
  491                 uint32_t af1 = af;
  492                 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
  493         }
  494 
  495         if ((ifp->if_flags & IFF_MONITOR) != 0) {
  496                 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  497                 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
  498                 m_freem(m);
  499                 return;
  500         }
  501 
  502         if (ng_gif_input_p != NULL) {
  503                 (*ng_gif_input_p)(ifp, &m, af);
  504                 if (m == NULL)
  505                         goto drop;
  506         }
  507 
  508         /*
  509          * Put the packet to the network layer input queue according to the
  510          * specified address family.
  511          * Note: older versions of gif_input directly called network layer
  512          * input functions, e.g. ip6_input, here.  We changed the policy to
  513          * prevent too many recursive calls of such input functions, which
  514          * might cause kernel panic.  But the change may introduce another
  515          * problem; if the input queue is full, packets are discarded.
  516          * The kernel stack overflow really happened, and we believed
  517          * queue-full rarely occurs, so we changed the policy.
  518          */
  519         switch (af) {
  520 #ifdef INET
  521         case AF_INET:
  522                 isr = NETISR_IP;
  523                 break;
  524 #endif
  525 #ifdef INET6
  526         case AF_INET6:
  527                 isr = NETISR_IPV6;
  528                 break;
  529 #endif
  530         case AF_LINK:
  531                 n = sizeof(struct etherip_header) +
  532                     sizeof(struct ether_header);
  533                 if (n > m->m_len)
  534                         m = m_pullup(m, n);
  535                 if (m == NULL)
  536                         goto drop;
  537                 eip = mtod(m, struct etherip_header *);
  538                 if (eip->eip_ver != ETHERIP_VERSION) {
  539                         /* discard unknown versions */
  540                         m_freem(m);
  541                         goto drop;
  542                 }
  543 
  544                 m_adj_decap(m, sizeof(struct etherip_header));
  545 
  546                 m->m_flags &= ~(M_BCAST|M_MCAST);
  547                 m->m_pkthdr.rcvif = ifp;
  548 
  549                 if (ifp->if_bridge) {
  550                         oldifp = ifp;
  551                         eh = mtod(m, struct ether_header *);
  552                         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
  553                                 if (ETHER_IS_BROADCAST(eh->ether_dhost))
  554                                         m->m_flags |= M_BCAST;
  555                                 else
  556                                         m->m_flags |= M_MCAST;
  557                                 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
  558                         }
  559                         BRIDGE_INPUT(ifp, m);
  560 
  561                         if (m != NULL && ifp != oldifp) {
  562                                 /*
  563                                  * The bridge gave us back itself or one of the
  564                                  * members for which the frame is addressed.
  565                                  */
  566                                 ether_demux(ifp, m);
  567                                 return;
  568                         }
  569                 }
  570                 if (m != NULL)
  571                         m_freem(m);
  572                 return;
  573 
  574         default:
  575                 if (ng_gif_input_orphan_p != NULL)
  576                         (*ng_gif_input_orphan_p)(ifp, m, af);
  577                 else
  578                         m_freem(m);
  579                 return;
  580         }
  581 
  582         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  583         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
  584         M_SETFIB(m, ifp->if_fib);
  585         netisr_dispatch(isr, m);
  586         return;
  587 drop:
  588         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
  589 }
  590 
  591 static int
  592 gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  593 {
  594         struct ifreq *ifr = (struct ifreq*)data;
  595         struct gif_softc *sc;
  596         u_int options;
  597         int error;
  598 
  599         switch (cmd) {
  600         case SIOCSIFADDR:
  601                 ifp->if_flags |= IFF_UP;
  602         case SIOCADDMULTI:
  603         case SIOCDELMULTI:
  604         case SIOCGIFMTU:
  605         case SIOCSIFFLAGS:
  606                 return (0);
  607         case SIOCSIFMTU:
  608                 if (ifr->ifr_mtu < GIF_MTU_MIN ||
  609                     ifr->ifr_mtu > GIF_MTU_MAX)
  610                         return (EINVAL);
  611                 else
  612                         ifp->if_mtu = ifr->ifr_mtu;
  613                 return (0);
  614         }
  615         sx_xlock(&gif_ioctl_sx);
  616         sc = ifp->if_softc;
  617         if (sc == NULL) {
  618                 error = ENXIO;
  619                 goto bad;
  620         }
  621         error = 0;
  622         switch (cmd) {
  623         case SIOCDIFPHYADDR:
  624                 if (sc->gif_family == 0)
  625                         break;
  626                 gif_delete_tunnel(sc);
  627                 break;
  628 #ifdef INET
  629         case SIOCSIFPHYADDR:
  630         case SIOCGIFPSRCADDR:
  631         case SIOCGIFPDSTADDR:
  632                 error = in_gif_ioctl(sc, cmd, data);
  633                 break;
  634 #endif
  635 #ifdef INET6
  636         case SIOCSIFPHYADDR_IN6:
  637         case SIOCGIFPSRCADDR_IN6:
  638         case SIOCGIFPDSTADDR_IN6:
  639                 error = in6_gif_ioctl(sc, cmd, data);
  640                 break;
  641 #endif
  642         case SIOCGTUNFIB:
  643                 ifr->ifr_fib = sc->gif_fibnum;
  644                 break;
  645         case SIOCSTUNFIB:
  646                 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
  647                         break;
  648                 if (ifr->ifr_fib >= rt_numfibs)
  649                         error = EINVAL;
  650                 else
  651                         sc->gif_fibnum = ifr->ifr_fib;
  652                 break;
  653         case GIFGOPTS:
  654                 options = sc->gif_options;
  655                 error = copyout(&options, ifr_data_get_ptr(ifr),
  656                     sizeof(options));
  657                 break;
  658         case GIFSOPTS:
  659                 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
  660                         break;
  661                 error = copyin(ifr_data_get_ptr(ifr), &options,
  662                     sizeof(options));
  663                 if (error)
  664                         break;
  665                 if (options & ~GIF_OPTMASK) {
  666                         error = EINVAL;
  667                         break;
  668                 }
  669                 if (sc->gif_options != options) {
  670                         switch (sc->gif_family) {
  671 #ifdef INET
  672                         case AF_INET:
  673                                 error = in_gif_setopts(sc, options);
  674                                 break;
  675 #endif
  676 #ifdef INET6
  677                         case AF_INET6:
  678                                 error = in6_gif_setopts(sc, options);
  679                                 break;
  680 #endif
  681                         default:
  682                                 /* No need to invoke AF-handler */
  683                                 sc->gif_options = options;
  684                         }
  685                 }
  686                 break;
  687         default:
  688                 error = EINVAL;
  689                 break;
  690         }
  691         if (error == 0 && sc->gif_family != 0) {
  692                 if (
  693 #ifdef INET
  694                     cmd == SIOCSIFPHYADDR ||
  695 #endif
  696 #ifdef INET6
  697                     cmd == SIOCSIFPHYADDR_IN6 ||
  698 #endif
  699                     0) {
  700                         if_link_state_change(ifp, LINK_STATE_UP);
  701                 }
  702         }
  703 bad:
  704         sx_xunlock(&gif_ioctl_sx);
  705         return (error);
  706 }
  707 
  708 static void
  709 gif_delete_tunnel(struct gif_softc *sc)
  710 {
  711 
  712         sx_assert(&gif_ioctl_sx, SA_XLOCKED);
  713         if (sc->gif_family != 0) {
  714                 CK_LIST_REMOVE(sc, srchash);
  715                 CK_LIST_REMOVE(sc, chain);
  716                 /* Wait until it become safe to free gif_hdr */
  717                 GIF_WAIT();
  718                 free(sc->gif_hdr, M_GIF);
  719         }
  720         sc->gif_family = 0;
  721         GIF2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
  722         if_link_state_change(GIF2IFP(sc), LINK_STATE_DOWN);
  723 }
  724 

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