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_private.h>
   64 #include <net/if_clone.h>
   65 #include <net/if_types.h>
   66 #include <net/netisr.h>
   67 #include <net/route.h>
   68 #include <net/bpf.h>
   69 #include <net/vnet.h>
   70 
   71 #include <netinet/in.h>
   72 #include <netinet/in_systm.h>
   73 #include <netinet/ip.h>
   74 #include <netinet/ip_ecn.h>
   75 #ifdef  INET
   76 #include <netinet/in_var.h>
   77 #include <netinet/ip_var.h>
   78 #endif  /* INET */
   79 
   80 #ifdef INET6
   81 #ifndef INET
   82 #include <netinet/in.h>
   83 #endif
   84 #include <netinet6/in6_var.h>
   85 #include <netinet/ip6.h>
   86 #include <netinet6/ip6_ecn.h>
   87 #include <netinet6/ip6_var.h>
   88 #endif /* INET6 */
   89 
   90 #include <netinet/ip_encap.h>
   91 #include <net/ethernet.h>
   92 #include <net/if_bridgevar.h>
   93 #include <net/if_gif.h>
   94 
   95 #include <security/mac/mac_framework.h>
   96 
   97 static const char gifname[] = "gif";
   98 
   99 MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
  100 static struct sx gif_ioctl_sx;
  101 SX_SYSINIT(gif_ioctl_sx, &gif_ioctl_sx, "gif_ioctl");
  102 
  103 void    (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af);
  104 void    (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af);
  105 void    (*ng_gif_attach_p)(struct ifnet *ifp);
  106 void    (*ng_gif_detach_p)(struct ifnet *ifp);
  107 
  108 #ifdef VIMAGE
  109 static void     gif_reassign(struct ifnet *, struct vnet *, char *);
  110 #endif
  111 static void     gif_delete_tunnel(struct gif_softc *);
  112 static int      gif_ioctl(struct ifnet *, u_long, caddr_t);
  113 static int      gif_transmit(struct ifnet *, struct mbuf *);
  114 static void     gif_qflush(struct ifnet *);
  115 static int      gif_clone_create(struct if_clone *, int, caddr_t);
  116 static void     gif_clone_destroy(struct ifnet *);
  117 VNET_DEFINE_STATIC(struct if_clone *, gif_cloner);
  118 #define V_gif_cloner    VNET(gif_cloner)
  119 
  120 SYSCTL_DECL(_net_link);
  121 static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
  122     "Generic Tunnel Interface");
  123 #ifndef MAX_GIF_NEST
  124 /*
  125  * This macro controls the default upper limitation on nesting of gif tunnels.
  126  * Since, setting a large value to this macro with a careless configuration
  127  * may introduce system crash, we don't allow any nestings by default.
  128  * If you need to configure nested gif tunnels, you can define this macro
  129  * in your kernel configuration file.  However, if you do so, please be
  130  * careful to configure the tunnels so that it won't make a loop.
  131  */
  132 #define MAX_GIF_NEST 1
  133 #endif
  134 VNET_DEFINE_STATIC(int, max_gif_nesting) = MAX_GIF_NEST;
  135 #define V_max_gif_nesting       VNET(max_gif_nesting)
  136 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
  137     &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels");
  138 
  139 static int
  140 gif_clone_create(struct if_clone *ifc, int unit, caddr_t params)
  141 {
  142         struct gif_softc *sc;
  143 
  144         sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO);
  145         sc->gif_fibnum = curthread->td_proc->p_fibnum;
  146         GIF2IFP(sc) = if_alloc(IFT_GIF);
  147         GIF2IFP(sc)->if_softc = sc;
  148         if_initname(GIF2IFP(sc), gifname, unit);
  149 
  150         GIF2IFP(sc)->if_addrlen = 0;
  151         GIF2IFP(sc)->if_mtu    = GIF_MTU;
  152         GIF2IFP(sc)->if_flags  = IFF_POINTOPOINT | IFF_MULTICAST;
  153         GIF2IFP(sc)->if_ioctl  = gif_ioctl;
  154         GIF2IFP(sc)->if_transmit = gif_transmit;
  155         GIF2IFP(sc)->if_qflush = gif_qflush;
  156         GIF2IFP(sc)->if_output = gif_output;
  157 #ifdef VIMAGE
  158         GIF2IFP(sc)->if_reassign = gif_reassign;
  159 #endif
  160         GIF2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
  161         GIF2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
  162         if_attach(GIF2IFP(sc));
  163         bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t));
  164         if (ng_gif_attach_p != NULL)
  165                 (*ng_gif_attach_p)(GIF2IFP(sc));
  166 
  167         return (0);
  168 }
  169 
  170 #ifdef VIMAGE
  171 static void
  172 gif_reassign(struct ifnet *ifp, struct vnet *new_vnet __unused,
  173     char *unused __unused)
  174 {
  175         struct gif_softc *sc;
  176 
  177         sx_xlock(&gif_ioctl_sx);
  178         sc = ifp->if_softc;
  179         if (sc != NULL)
  180                 gif_delete_tunnel(sc);
  181         sx_xunlock(&gif_ioctl_sx);
  182 }
  183 #endif /* VIMAGE */
  184 
  185 static void
  186 gif_clone_destroy(struct ifnet *ifp)
  187 {
  188         struct gif_softc *sc;
  189 
  190         sx_xlock(&gif_ioctl_sx);
  191         sc = ifp->if_softc;
  192         gif_delete_tunnel(sc);
  193         if (ng_gif_detach_p != NULL)
  194                 (*ng_gif_detach_p)(ifp);
  195         bpfdetach(ifp);
  196         if_detach(ifp);
  197         ifp->if_softc = NULL;
  198         sx_xunlock(&gif_ioctl_sx);
  199 
  200         GIF_WAIT();
  201         if_free(ifp);
  202         free(sc, M_GIF);
  203 }
  204 
  205 static void
  206 vnet_gif_init(const void *unused __unused)
  207 {
  208 
  209         V_gif_cloner = if_clone_simple(gifname, gif_clone_create,
  210             gif_clone_destroy, 0);
  211 #ifdef INET
  212         in_gif_init();
  213 #endif
  214 #ifdef INET6
  215         in6_gif_init();
  216 #endif
  217 }
  218 VNET_SYSINIT(vnet_gif_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  219     vnet_gif_init, NULL);
  220 
  221 static void
  222 vnet_gif_uninit(const void *unused __unused)
  223 {
  224 
  225         if_clone_detach(V_gif_cloner);
  226 #ifdef INET
  227         in_gif_uninit();
  228 #endif
  229 #ifdef INET6
  230         in6_gif_uninit();
  231 #endif
  232 }
  233 VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
  234     vnet_gif_uninit, NULL);
  235 
  236 static int
  237 gifmodevent(module_t mod, int type, void *data)
  238 {
  239 
  240         switch (type) {
  241         case MOD_LOAD:
  242         case MOD_UNLOAD:
  243                 break;
  244         default:
  245                 return (EOPNOTSUPP);
  246         }
  247         return (0);
  248 }
  249 
  250 static moduledata_t gif_mod = {
  251         "if_gif",
  252         gifmodevent,
  253         0
  254 };
  255 
  256 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  257 MODULE_VERSION(if_gif, 1);
  258 
  259 struct gif_list *
  260 gif_hashinit(void)
  261 {
  262         struct gif_list *hash;
  263         int i;
  264 
  265         hash = malloc(sizeof(struct gif_list) * GIF_HASH_SIZE,
  266             M_GIF, M_WAITOK);
  267         for (i = 0; i < GIF_HASH_SIZE; i++)
  268                 CK_LIST_INIT(&hash[i]);
  269 
  270         return (hash);
  271 }
  272 
  273 void
  274 gif_hashdestroy(struct gif_list *hash)
  275 {
  276 
  277         free(hash, M_GIF);
  278 }
  279 
  280 #define MTAG_GIF        1080679712
  281 static int
  282 gif_transmit(struct ifnet *ifp, struct mbuf *m)
  283 {
  284         struct gif_softc *sc;
  285         struct etherip_header *eth;
  286 #ifdef INET
  287         struct ip *ip;
  288 #endif
  289 #ifdef INET6
  290         struct ip6_hdr *ip6;
  291         uint32_t t;
  292 #endif
  293         uint32_t af;
  294         uint8_t proto, ecn;
  295         int error;
  296 
  297         NET_EPOCH_ASSERT();
  298 #ifdef MAC
  299         error = mac_ifnet_check_transmit(ifp, m);
  300         if (error) {
  301                 m_freem(m);
  302                 goto err;
  303         }
  304 #endif
  305         error = ENETDOWN;
  306         sc = ifp->if_softc;
  307         if ((ifp->if_flags & IFF_MONITOR) != 0 ||
  308             (ifp->if_flags & IFF_UP) == 0 ||
  309             (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
  310             sc->gif_family == 0 ||
  311             (error = if_tunnel_check_nesting(ifp, m, MTAG_GIF,
  312                 V_max_gif_nesting)) != 0) {
  313                 m_freem(m);
  314                 goto err;
  315         }
  316         /* Now pull back the af that we stashed in the csum_data. */
  317         if (ifp->if_bridge)
  318                 af = AF_LINK;
  319         else
  320                 af = m->m_pkthdr.csum_data;
  321         m->m_flags &= ~(M_BCAST|M_MCAST);
  322         M_SETFIB(m, sc->gif_fibnum);
  323         BPF_MTAP2(ifp, &af, sizeof(af), m);
  324         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  325         if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
  326         /* inner AF-specific encapsulation */
  327         ecn = 0;
  328         switch (af) {
  329 #ifdef INET
  330         case AF_INET:
  331                 proto = IPPROTO_IPV4;
  332                 if (m->m_len < sizeof(struct ip))
  333                         m = m_pullup(m, sizeof(struct ip));
  334                 if (m == NULL) {
  335                         error = ENOBUFS;
  336                         goto err;
  337                 }
  338                 ip = mtod(m, struct ip *);
  339                 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  340                     ECN_NOCARE, &ecn, &ip->ip_tos);
  341                 break;
  342 #endif
  343 #ifdef INET6
  344         case AF_INET6:
  345                 proto = IPPROTO_IPV6;
  346                 if (m->m_len < sizeof(struct ip6_hdr))
  347                         m = m_pullup(m, sizeof(struct ip6_hdr));
  348                 if (m == NULL) {
  349                         error = ENOBUFS;
  350                         goto err;
  351                 }
  352                 t = 0;
  353                 ip6 = mtod(m, struct ip6_hdr *);
  354                 ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  355                     ECN_NOCARE, &t, &ip6->ip6_flow);
  356                 ecn = (ntohl(t) >> 20) & 0xff;
  357                 break;
  358 #endif
  359         case AF_LINK:
  360                 proto = IPPROTO_ETHERIP;
  361                 M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT);
  362                 if (m == NULL) {
  363                         error = ENOBUFS;
  364                         goto err;
  365                 }
  366                 eth = mtod(m, struct etherip_header *);
  367                 eth->eip_resvh = 0;
  368                 eth->eip_ver = ETHERIP_VERSION;
  369                 eth->eip_resvl = 0;
  370                 break;
  371         default:
  372                 error = EAFNOSUPPORT;
  373                 m_freem(m);
  374                 goto err;
  375         }
  376         /* XXX should we check if our outer source is legal? */
  377         /* dispatch to output logic based on outer AF */
  378         switch (sc->gif_family) {
  379 #ifdef INET
  380         case AF_INET:
  381                 error = in_gif_output(ifp, m, proto, ecn);
  382                 break;
  383 #endif
  384 #ifdef INET6
  385         case AF_INET6:
  386                 error = in6_gif_output(ifp, m, proto, ecn);
  387                 break;
  388 #endif
  389         default:
  390                 m_freem(m);
  391         }
  392 err:
  393         if (error)
  394                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  395         return (error);
  396 }
  397 
  398 static void
  399 gif_qflush(struct ifnet *ifp __unused)
  400 {
  401 
  402 }
  403 
  404 int
  405 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
  406         struct route *ro)
  407 {
  408         uint32_t af;
  409 
  410         if (dst->sa_family == AF_UNSPEC)
  411                 bcopy(dst->sa_data, &af, sizeof(af));
  412         else
  413                 af = RO_GET_FAMILY(ro, dst);
  414         /*
  415          * Now save the af in the inbound pkt csum data, this is a cheat since
  416          * we are using the inbound csum_data field to carry the af over to
  417          * the gif_transmit() routine, avoiding using yet another mtag.
  418          */
  419         m->m_pkthdr.csum_data = af;
  420         return (ifp->if_transmit(ifp, m));
  421 }
  422 
  423 void
  424 gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn)
  425 {
  426         struct etherip_header *eip;
  427 #ifdef INET
  428         struct ip *ip;
  429 #endif
  430 #ifdef INET6
  431         struct ip6_hdr *ip6;
  432         uint32_t t;
  433 #endif
  434         struct ether_header *eh;
  435         struct ifnet *oldifp;
  436         int isr, n, af;
  437 
  438         NET_EPOCH_ASSERT();
  439 
  440         if (ifp == NULL) {
  441                 /* just in case */
  442                 m_freem(m);
  443                 return;
  444         }
  445         m->m_pkthdr.rcvif = ifp;
  446         m_clrprotoflags(m);
  447         switch (proto) {
  448 #ifdef INET
  449         case IPPROTO_IPV4:
  450                 af = AF_INET;
  451                 if (m->m_len < sizeof(struct ip))
  452                         m = m_pullup(m, sizeof(struct ip));
  453                 if (m == NULL)
  454                         goto drop;
  455                 ip = mtod(m, struct ip *);
  456                 if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  457                     ECN_NOCARE, &ecn, &ip->ip_tos) == 0) {
  458                         m_freem(m);
  459                         goto drop;
  460                 }
  461                 break;
  462 #endif
  463 #ifdef INET6
  464         case IPPROTO_IPV6:
  465                 af = AF_INET6;
  466                 if (m->m_len < sizeof(struct ip6_hdr))
  467                         m = m_pullup(m, sizeof(struct ip6_hdr));
  468                 if (m == NULL)
  469                         goto drop;
  470                 t = htonl((uint32_t)ecn << 20);
  471                 ip6 = mtod(m, struct ip6_hdr *);
  472                 if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  473                     ECN_NOCARE, &t, &ip6->ip6_flow) == 0) {
  474                         m_freem(m);
  475                         goto drop;
  476                 }
  477                 break;
  478 #endif
  479         case IPPROTO_ETHERIP:
  480                 af = AF_LINK;
  481                 break;
  482         default:
  483                 m_freem(m);
  484                 goto drop;
  485         }
  486 
  487 #ifdef MAC
  488         mac_ifnet_create_mbuf(ifp, m);
  489 #endif
  490 
  491         if (bpf_peers_present(ifp->if_bpf)) {
  492                 uint32_t af1 = af;
  493                 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
  494         }
  495 
  496         if ((ifp->if_flags & IFF_MONITOR) != 0) {
  497                 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  498                 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
  499                 m_freem(m);
  500                 return;
  501         }
  502 
  503         if (ng_gif_input_p != NULL) {
  504                 (*ng_gif_input_p)(ifp, &m, af);
  505                 if (m == NULL)
  506                         goto drop;
  507         }
  508 
  509         /*
  510          * Put the packet to the network layer input queue according to the
  511          * specified address family.
  512          * Note: older versions of gif_input directly called network layer
  513          * input functions, e.g. ip6_input, here.  We changed the policy to
  514          * prevent too many recursive calls of such input functions, which
  515          * might cause kernel panic.  But the change may introduce another
  516          * problem; if the input queue is full, packets are discarded.
  517          * The kernel stack overflow really happened, and we believed
  518          * queue-full rarely occurs, so we changed the policy.
  519          */
  520         switch (af) {
  521 #ifdef INET
  522         case AF_INET:
  523                 isr = NETISR_IP;
  524                 break;
  525 #endif
  526 #ifdef INET6
  527         case AF_INET6:
  528                 isr = NETISR_IPV6;
  529                 break;
  530 #endif
  531         case AF_LINK:
  532                 n = sizeof(struct etherip_header) +
  533                     sizeof(struct ether_header);
  534                 if (n > m->m_len)
  535                         m = m_pullup(m, n);
  536                 if (m == NULL)
  537                         goto drop;
  538                 eip = mtod(m, struct etherip_header *);
  539                 if (eip->eip_ver != ETHERIP_VERSION) {
  540                         /* discard unknown versions */
  541                         m_freem(m);
  542                         goto drop;
  543                 }
  544 
  545                 m_adj_decap(m, sizeof(struct etherip_header));
  546 
  547                 m->m_flags &= ~(M_BCAST|M_MCAST);
  548                 m->m_pkthdr.rcvif = ifp;
  549 
  550                 if (ifp->if_bridge) {
  551                         oldifp = ifp;
  552                         eh = mtod(m, struct ether_header *);
  553                         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
  554                                 if (ETHER_IS_BROADCAST(eh->ether_dhost))
  555                                         m->m_flags |= M_BCAST;
  556                                 else
  557                                         m->m_flags |= M_MCAST;
  558                                 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
  559                         }
  560                         BRIDGE_INPUT(ifp, m);
  561 
  562                         if (m != NULL && ifp != oldifp) {
  563                                 /*
  564                                  * The bridge gave us back itself or one of the
  565                                  * members for which the frame is addressed.
  566                                  */
  567                                 ether_demux(ifp, m);
  568                                 return;
  569                         }
  570                 }
  571                 if (m != NULL)
  572                         m_freem(m);
  573                 return;
  574 
  575         default:
  576                 if (ng_gif_input_orphan_p != NULL)
  577                         (*ng_gif_input_orphan_p)(ifp, m, af);
  578                 else
  579                         m_freem(m);
  580                 return;
  581         }
  582 
  583         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  584         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
  585         M_SETFIB(m, ifp->if_fib);
  586         netisr_dispatch(isr, m);
  587         return;
  588 drop:
  589         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
  590 }
  591 
  592 static int
  593 gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  594 {
  595         struct ifreq *ifr = (struct ifreq*)data;
  596         struct gif_softc *sc;
  597         u_int options;
  598         int error;
  599 
  600         switch (cmd) {
  601         case SIOCSIFADDR:
  602                 ifp->if_flags |= IFF_UP;
  603         case SIOCADDMULTI:
  604         case SIOCDELMULTI:
  605         case SIOCGIFMTU:
  606         case SIOCSIFFLAGS:
  607                 return (0);
  608         case SIOCSIFMTU:
  609                 if (ifr->ifr_mtu < GIF_MTU_MIN ||
  610                     ifr->ifr_mtu > GIF_MTU_MAX)
  611                         return (EINVAL);
  612                 else
  613                         ifp->if_mtu = ifr->ifr_mtu;
  614                 return (0);
  615         }
  616         sx_xlock(&gif_ioctl_sx);
  617         sc = ifp->if_softc;
  618         if (sc == NULL) {
  619                 error = ENXIO;
  620                 goto bad;
  621         }
  622         error = 0;
  623         switch (cmd) {
  624         case SIOCDIFPHYADDR:
  625                 if (sc->gif_family == 0)
  626                         break;
  627                 gif_delete_tunnel(sc);
  628                 break;
  629 #ifdef INET
  630         case SIOCSIFPHYADDR:
  631         case SIOCGIFPSRCADDR:
  632         case SIOCGIFPDSTADDR:
  633                 error = in_gif_ioctl(sc, cmd, data);
  634                 break;
  635 #endif
  636 #ifdef INET6
  637         case SIOCSIFPHYADDR_IN6:
  638         case SIOCGIFPSRCADDR_IN6:
  639         case SIOCGIFPDSTADDR_IN6:
  640                 error = in6_gif_ioctl(sc, cmd, data);
  641                 break;
  642 #endif
  643         case SIOCGTUNFIB:
  644                 ifr->ifr_fib = sc->gif_fibnum;
  645                 break;
  646         case SIOCSTUNFIB:
  647                 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
  648                         break;
  649                 if (ifr->ifr_fib >= rt_numfibs)
  650                         error = EINVAL;
  651                 else
  652                         sc->gif_fibnum = ifr->ifr_fib;
  653                 break;
  654         case GIFGOPTS:
  655                 options = sc->gif_options;
  656                 error = copyout(&options, ifr_data_get_ptr(ifr),
  657                     sizeof(options));
  658                 break;
  659         case GIFSOPTS:
  660                 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
  661                         break;
  662                 error = copyin(ifr_data_get_ptr(ifr), &options,
  663                     sizeof(options));
  664                 if (error)
  665                         break;
  666                 if (options & ~GIF_OPTMASK) {
  667                         error = EINVAL;
  668                         break;
  669                 }
  670                 if (sc->gif_options != options) {
  671                         switch (sc->gif_family) {
  672 #ifdef INET
  673                         case AF_INET:
  674                                 error = in_gif_setopts(sc, options);
  675                                 break;
  676 #endif
  677 #ifdef INET6
  678                         case AF_INET6:
  679                                 error = in6_gif_setopts(sc, options);
  680                                 break;
  681 #endif
  682                         default:
  683                                 /* No need to invoke AF-handler */
  684                                 sc->gif_options = options;
  685                         }
  686                 }
  687                 break;
  688         default:
  689                 error = EINVAL;
  690                 break;
  691         }
  692         if (error == 0 && sc->gif_family != 0) {
  693                 if (
  694 #ifdef INET
  695                     cmd == SIOCSIFPHYADDR ||
  696 #endif
  697 #ifdef INET6
  698                     cmd == SIOCSIFPHYADDR_IN6 ||
  699 #endif
  700                     0) {
  701                         if_link_state_change(ifp, LINK_STATE_UP);
  702                 }
  703         }
  704 bad:
  705         sx_xunlock(&gif_ioctl_sx);
  706         return (error);
  707 }
  708 
  709 static void
  710 gif_delete_tunnel(struct gif_softc *sc)
  711 {
  712 
  713         sx_assert(&gif_ioctl_sx, SA_XLOCKED);
  714         if (sc->gif_family != 0) {
  715                 CK_LIST_REMOVE(sc, srchash);
  716                 CK_LIST_REMOVE(sc, chain);
  717                 /* Wait until it become safe to free gif_hdr */
  718                 GIF_WAIT();
  719                 free(sc->gif_hdr, M_GIF);
  720         }
  721         sc->gif_family = 0;
  722         GIF2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
  723         if_link_state_change(GIF2IFP(sc), LINK_STATE_DOWN);
  724 }
Cache object: 0864cebe5cefbaa3018844d065b82667
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FreeBSD/Linux Kernel Cross Reference sys/net/if_gif.c

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