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: releng/12.0/sys/net/if_gif.c 339772 2018-10-26 10:20:03Z ae $");
   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 static void     gif_delete_tunnel(struct gif_softc *);
  108 static int      gif_ioctl(struct ifnet *, u_long, caddr_t);
  109 static int      gif_transmit(struct ifnet *, struct mbuf *);
  110 static void     gif_qflush(struct ifnet *);
  111 static int      gif_clone_create(struct if_clone *, int, caddr_t);
  112 static void     gif_clone_destroy(struct ifnet *);
  113 VNET_DEFINE_STATIC(struct if_clone *, gif_cloner);
  114 #define V_gif_cloner    VNET(gif_cloner)
  115 
  116 SYSCTL_DECL(_net_link);
  117 static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0,
  118     "Generic Tunnel Interface");
  119 #ifndef MAX_GIF_NEST
  120 /*
  121  * This macro controls the default upper limitation on nesting of gif tunnels.
  122  * Since, setting a large value to this macro with a careless configuration
  123  * may introduce system crash, we don't allow any nestings by default.
  124  * If you need to configure nested gif tunnels, you can define this macro
  125  * in your kernel configuration file.  However, if you do so, please be
  126  * careful to configure the tunnels so that it won't make a loop.
  127  */
  128 #define MAX_GIF_NEST 1
  129 #endif
  130 VNET_DEFINE_STATIC(int, max_gif_nesting) = MAX_GIF_NEST;
  131 #define V_max_gif_nesting       VNET(max_gif_nesting)
  132 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
  133     &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels");
  134 
  135 static int
  136 gif_clone_create(struct if_clone *ifc, int unit, caddr_t params)
  137 {
  138         struct gif_softc *sc;
  139 
  140         sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO);
  141         sc->gif_fibnum = curthread->td_proc->p_fibnum;
  142         GIF2IFP(sc) = if_alloc(IFT_GIF);
  143         GIF2IFP(sc)->if_softc = sc;
  144         if_initname(GIF2IFP(sc), gifname, unit);
  145 
  146         GIF2IFP(sc)->if_addrlen = 0;
  147         GIF2IFP(sc)->if_mtu    = GIF_MTU;
  148         GIF2IFP(sc)->if_flags  = IFF_POINTOPOINT | IFF_MULTICAST;
  149         GIF2IFP(sc)->if_ioctl  = gif_ioctl;
  150         GIF2IFP(sc)->if_transmit = gif_transmit;
  151         GIF2IFP(sc)->if_qflush = gif_qflush;
  152         GIF2IFP(sc)->if_output = gif_output;
  153         GIF2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
  154         GIF2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
  155         if_attach(GIF2IFP(sc));
  156         bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t));
  157         if (ng_gif_attach_p != NULL)
  158                 (*ng_gif_attach_p)(GIF2IFP(sc));
  159 
  160         return (0);
  161 }
  162 
  163 static void
  164 gif_clone_destroy(struct ifnet *ifp)
  165 {
  166         struct gif_softc *sc;
  167 
  168         sx_xlock(&gif_ioctl_sx);
  169         sc = ifp->if_softc;
  170         gif_delete_tunnel(sc);
  171         if (ng_gif_detach_p != NULL)
  172                 (*ng_gif_detach_p)(ifp);
  173         bpfdetach(ifp);
  174         if_detach(ifp);
  175         ifp->if_softc = NULL;
  176         sx_xunlock(&gif_ioctl_sx);
  177 
  178         GIF_WAIT();
  179         if_free(ifp);
  180         free(sc, M_GIF);
  181 }
  182 
  183 static void
  184 vnet_gif_init(const void *unused __unused)
  185 {
  186 
  187         V_gif_cloner = if_clone_simple(gifname, gif_clone_create,
  188             gif_clone_destroy, 0);
  189 #ifdef INET
  190         in_gif_init();
  191 #endif
  192 #ifdef INET6
  193         in6_gif_init();
  194 #endif
  195 }
  196 VNET_SYSINIT(vnet_gif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
  197     vnet_gif_init, NULL);
  198 
  199 static void
  200 vnet_gif_uninit(const void *unused __unused)
  201 {
  202 
  203         if_clone_detach(V_gif_cloner);
  204 #ifdef INET
  205         in_gif_uninit();
  206 #endif
  207 #ifdef INET6
  208         in6_gif_uninit();
  209 #endif
  210 }
  211 VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
  212     vnet_gif_uninit, NULL);
  213 
  214 static int
  215 gifmodevent(module_t mod, int type, void *data)
  216 {
  217 
  218         switch (type) {
  219         case MOD_LOAD:
  220         case MOD_UNLOAD:
  221                 break;
  222         default:
  223                 return (EOPNOTSUPP);
  224         }
  225         return (0);
  226 }
  227 
  228 static moduledata_t gif_mod = {
  229         "if_gif",
  230         gifmodevent,
  231         0
  232 };
  233 
  234 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  235 MODULE_VERSION(if_gif, 1);
  236 
  237 struct gif_list *
  238 gif_hashinit(void)
  239 {
  240         struct gif_list *hash;
  241         int i;
  242 
  243         hash = malloc(sizeof(struct gif_list) * GIF_HASH_SIZE,
  244             M_GIF, M_WAITOK);
  245         for (i = 0; i < GIF_HASH_SIZE; i++)
  246                 CK_LIST_INIT(&hash[i]);
  247 
  248         return (hash);
  249 }
  250 
  251 void
  252 gif_hashdestroy(struct gif_list *hash)
  253 {
  254 
  255         free(hash, M_GIF);
  256 }
  257 
  258 #define MTAG_GIF        1080679712
  259 static int
  260 gif_transmit(struct ifnet *ifp, struct mbuf *m)
  261 {
  262         struct gif_softc *sc;
  263         struct etherip_header *eth;
  264 #ifdef INET
  265         struct ip *ip;
  266 #endif
  267 #ifdef INET6
  268         struct ip6_hdr *ip6;
  269         uint32_t t;
  270 #endif
  271         uint32_t af;
  272         uint8_t proto, ecn;
  273         int error;
  274 
  275         GIF_RLOCK();
  276 #ifdef MAC
  277         error = mac_ifnet_check_transmit(ifp, m);
  278         if (error) {
  279                 m_freem(m);
  280                 goto err;
  281         }
  282 #endif
  283         error = ENETDOWN;
  284         sc = ifp->if_softc;
  285         if ((ifp->if_flags & IFF_MONITOR) != 0 ||
  286             (ifp->if_flags & IFF_UP) == 0 ||
  287             sc->gif_family == 0 ||
  288             (error = if_tunnel_check_nesting(ifp, m, MTAG_GIF,
  289                 V_max_gif_nesting)) != 0) {
  290                 m_freem(m);
  291                 goto err;
  292         }
  293         /* Now pull back the af that we stashed in the csum_data. */
  294         if (ifp->if_bridge)
  295                 af = AF_LINK;
  296         else
  297                 af = m->m_pkthdr.csum_data;
  298         m->m_flags &= ~(M_BCAST|M_MCAST);
  299         M_SETFIB(m, sc->gif_fibnum);
  300         BPF_MTAP2(ifp, &af, sizeof(af), m);
  301         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  302         if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
  303         /* inner AF-specific encapsulation */
  304         ecn = 0;
  305         switch (af) {
  306 #ifdef INET
  307         case AF_INET:
  308                 proto = IPPROTO_IPV4;
  309                 if (m->m_len < sizeof(struct ip))
  310                         m = m_pullup(m, sizeof(struct ip));
  311                 if (m == NULL) {
  312                         error = ENOBUFS;
  313                         goto err;
  314                 }
  315                 ip = mtod(m, struct ip *);
  316                 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  317                     ECN_NOCARE, &ecn, &ip->ip_tos);
  318                 break;
  319 #endif
  320 #ifdef INET6
  321         case AF_INET6:
  322                 proto = IPPROTO_IPV6;
  323                 if (m->m_len < sizeof(struct ip6_hdr))
  324                         m = m_pullup(m, sizeof(struct ip6_hdr));
  325                 if (m == NULL) {
  326                         error = ENOBUFS;
  327                         goto err;
  328                 }
  329                 t = 0;
  330                 ip6 = mtod(m, struct ip6_hdr *);
  331                 ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  332                     ECN_NOCARE, &t, &ip6->ip6_flow);
  333                 ecn = (ntohl(t) >> 20) & 0xff;
  334                 break;
  335 #endif
  336         case AF_LINK:
  337                 proto = IPPROTO_ETHERIP;
  338                 M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT);
  339                 if (m == NULL) {
  340                         error = ENOBUFS;
  341                         goto err;
  342                 }
  343                 eth = mtod(m, struct etherip_header *);
  344                 eth->eip_resvh = 0;
  345                 eth->eip_ver = ETHERIP_VERSION;
  346                 eth->eip_resvl = 0;
  347                 break;
  348         default:
  349                 error = EAFNOSUPPORT;
  350                 m_freem(m);
  351                 goto err;
  352         }
  353         /* XXX should we check if our outer source is legal? */
  354         /* dispatch to output logic based on outer AF */
  355         switch (sc->gif_family) {
  356 #ifdef INET
  357         case AF_INET:
  358                 error = in_gif_output(ifp, m, proto, ecn);
  359                 break;
  360 #endif
  361 #ifdef INET6
  362         case AF_INET6:
  363                 error = in6_gif_output(ifp, m, proto, ecn);
  364                 break;
  365 #endif
  366         default:
  367                 m_freem(m);
  368         }
  369 err:
  370         if (error)
  371                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  372         GIF_RUNLOCK();
  373         return (error);
  374 }
  375 
  376 static void
  377 gif_qflush(struct ifnet *ifp __unused)
  378 {
  379 
  380 }
  381 
  382 
  383 int
  384 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
  385         struct route *ro)
  386 {
  387         uint32_t af;
  388 
  389         if (dst->sa_family == AF_UNSPEC)
  390                 bcopy(dst->sa_data, &af, sizeof(af));
  391         else
  392                 af = dst->sa_family;
  393         /*
  394          * Now save the af in the inbound pkt csum data, this is a cheat since
  395          * we are using the inbound csum_data field to carry the af over to
  396          * the gif_transmit() routine, avoiding using yet another mtag.
  397          */
  398         m->m_pkthdr.csum_data = af;
  399         return (ifp->if_transmit(ifp, m));
  400 }
  401 
  402 void
  403 gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn)
  404 {
  405         struct etherip_header *eip;
  406 #ifdef INET
  407         struct ip *ip;
  408 #endif
  409 #ifdef INET6
  410         struct ip6_hdr *ip6;
  411         uint32_t t;
  412 #endif
  413         struct ether_header *eh;
  414         struct ifnet *oldifp;
  415         int isr, n, af;
  416 
  417         if (ifp == NULL) {
  418                 /* just in case */
  419                 m_freem(m);
  420                 return;
  421         }
  422         m->m_pkthdr.rcvif = ifp;
  423         m_clrprotoflags(m);
  424         switch (proto) {
  425 #ifdef INET
  426         case IPPROTO_IPV4:
  427                 af = AF_INET;
  428                 if (m->m_len < sizeof(struct ip))
  429                         m = m_pullup(m, sizeof(struct ip));
  430                 if (m == NULL)
  431                         goto drop;
  432                 ip = mtod(m, struct ip *);
  433                 if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  434                     ECN_NOCARE, &ecn, &ip->ip_tos) == 0) {
  435                         m_freem(m);
  436                         goto drop;
  437                 }
  438                 break;
  439 #endif
  440 #ifdef INET6
  441         case IPPROTO_IPV6:
  442                 af = AF_INET6;
  443                 if (m->m_len < sizeof(struct ip6_hdr))
  444                         m = m_pullup(m, sizeof(struct ip6_hdr));
  445                 if (m == NULL)
  446                         goto drop;
  447                 t = htonl((uint32_t)ecn << 20);
  448                 ip6 = mtod(m, struct ip6_hdr *);
  449                 if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
  450                     ECN_NOCARE, &t, &ip6->ip6_flow) == 0) {
  451                         m_freem(m);
  452                         goto drop;
  453                 }
  454                 break;
  455 #endif
  456         case IPPROTO_ETHERIP:
  457                 af = AF_LINK;
  458                 break;
  459         default:
  460                 m_freem(m);
  461                 goto drop;
  462         }
  463 
  464 #ifdef MAC
  465         mac_ifnet_create_mbuf(ifp, m);
  466 #endif
  467 
  468         if (bpf_peers_present(ifp->if_bpf)) {
  469                 uint32_t af1 = af;
  470                 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
  471         }
  472 
  473         if ((ifp->if_flags & IFF_MONITOR) != 0) {
  474                 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  475                 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
  476                 m_freem(m);
  477                 return;
  478         }
  479 
  480         if (ng_gif_input_p != NULL) {
  481                 (*ng_gif_input_p)(ifp, &m, af);
  482                 if (m == NULL)
  483                         goto drop;
  484         }
  485 
  486         /*
  487          * Put the packet to the network layer input queue according to the
  488          * specified address family.
  489          * Note: older versions of gif_input directly called network layer
  490          * input functions, e.g. ip6_input, here.  We changed the policy to
  491          * prevent too many recursive calls of such input functions, which
  492          * might cause kernel panic.  But the change may introduce another
  493          * problem; if the input queue is full, packets are discarded.
  494          * The kernel stack overflow really happened, and we believed
  495          * queue-full rarely occurs, so we changed the policy.
  496          */
  497         switch (af) {
  498 #ifdef INET
  499         case AF_INET:
  500                 isr = NETISR_IP;
  501                 break;
  502 #endif
  503 #ifdef INET6
  504         case AF_INET6:
  505                 isr = NETISR_IPV6;
  506                 break;
  507 #endif
  508         case AF_LINK:
  509                 n = sizeof(struct etherip_header) +
  510                     sizeof(struct ether_header);
  511                 if (n > m->m_len)
  512                         m = m_pullup(m, n);
  513                 if (m == NULL)
  514                         goto drop;
  515                 eip = mtod(m, struct etherip_header *);
  516                 if (eip->eip_ver != ETHERIP_VERSION) {
  517                         /* discard unknown versions */
  518                         m_freem(m);
  519                         goto drop;
  520                 }
  521                 m_adj(m, sizeof(struct etherip_header));
  522 
  523                 m->m_flags &= ~(M_BCAST|M_MCAST);
  524                 m->m_pkthdr.rcvif = ifp;
  525 
  526                 if (ifp->if_bridge) {
  527                         oldifp = ifp;
  528                         eh = mtod(m, struct ether_header *);
  529                         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
  530                                 if (ETHER_IS_BROADCAST(eh->ether_dhost))
  531                                         m->m_flags |= M_BCAST;
  532                                 else
  533                                         m->m_flags |= M_MCAST;
  534                                 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
  535                         }
  536                         BRIDGE_INPUT(ifp, m);
  537 
  538                         if (m != NULL && ifp != oldifp) {
  539                                 /*
  540                                  * The bridge gave us back itself or one of the
  541                                  * members for which the frame is addressed.
  542                                  */
  543                                 ether_demux(ifp, m);
  544                                 return;
  545                         }
  546                 }
  547                 if (m != NULL)
  548                         m_freem(m);
  549                 return;
  550 
  551         default:
  552                 if (ng_gif_input_orphan_p != NULL)
  553                         (*ng_gif_input_orphan_p)(ifp, m, af);
  554                 else
  555                         m_freem(m);
  556                 return;
  557         }
  558 
  559         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  560         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
  561         M_SETFIB(m, ifp->if_fib);
  562         netisr_dispatch(isr, m);
  563         return;
  564 drop:
  565         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
  566 }
  567 
  568 static int
  569 gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  570 {
  571         struct ifreq *ifr = (struct ifreq*)data;
  572         struct gif_softc *sc;
  573         u_int options;
  574         int error;
  575 
  576         switch (cmd) {
  577         case SIOCSIFADDR:
  578                 ifp->if_flags |= IFF_UP;
  579         case SIOCADDMULTI:
  580         case SIOCDELMULTI:
  581         case SIOCGIFMTU:
  582         case SIOCSIFFLAGS:
  583                 return (0);
  584         case SIOCSIFMTU:
  585                 if (ifr->ifr_mtu < GIF_MTU_MIN ||
  586                     ifr->ifr_mtu > GIF_MTU_MAX)
  587                         return (EINVAL);
  588                 else
  589                         ifp->if_mtu = ifr->ifr_mtu;
  590                 return (0);
  591         }
  592         sx_xlock(&gif_ioctl_sx);
  593         sc = ifp->if_softc;
  594         if (sc == NULL) {
  595                 error = ENXIO;
  596                 goto bad;
  597         }
  598         error = 0;
  599         switch (cmd) {
  600         case SIOCDIFPHYADDR:
  601                 if (sc->gif_family == 0)
  602                         break;
  603                 gif_delete_tunnel(sc);
  604                 break;
  605 #ifdef INET
  606         case SIOCSIFPHYADDR:
  607         case SIOCGIFPSRCADDR:
  608         case SIOCGIFPDSTADDR:
  609                 error = in_gif_ioctl(sc, cmd, data);
  610                 break;
  611 #endif
  612 #ifdef INET6
  613         case SIOCSIFPHYADDR_IN6:
  614         case SIOCGIFPSRCADDR_IN6:
  615         case SIOCGIFPDSTADDR_IN6:
  616                 error = in6_gif_ioctl(sc, cmd, data);
  617                 break;
  618 #endif
  619         case SIOCGTUNFIB:
  620                 ifr->ifr_fib = sc->gif_fibnum;
  621                 break;
  622         case SIOCSTUNFIB:
  623                 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
  624                         break;
  625                 if (ifr->ifr_fib >= rt_numfibs)
  626                         error = EINVAL;
  627                 else
  628                         sc->gif_fibnum = ifr->ifr_fib;
  629                 break;
  630         case GIFGOPTS:
  631                 options = sc->gif_options;
  632                 error = copyout(&options, ifr_data_get_ptr(ifr),
  633                     sizeof(options));
  634                 break;
  635         case GIFSOPTS:
  636                 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
  637                         break;
  638                 error = copyin(ifr_data_get_ptr(ifr), &options,
  639                     sizeof(options));
  640                 if (error)
  641                         break;
  642                 if (options & ~GIF_OPTMASK) {
  643                         error = EINVAL;
  644                         break;
  645                 }
  646                 if (sc->gif_options != options) {
  647                         switch (sc->gif_family) {
  648 #ifdef INET
  649                         case AF_INET:
  650                                 error = in_gif_setopts(sc, options);
  651                                 break;
  652 #endif
  653 #ifdef INET6
  654                         case AF_INET6:
  655                                 error = in6_gif_setopts(sc, options);
  656                                 break;
  657 #endif
  658                         default:
  659                                 /* No need to invoke AF-handler */
  660                                 sc->gif_options = options;
  661                         }
  662                 }
  663                 break;
  664         default:
  665                 error = EINVAL;
  666                 break;
  667         }
  668         if (error == 0 && sc->gif_family != 0) {
  669                 if (
  670 #ifdef INET
  671                     cmd == SIOCSIFPHYADDR ||
  672 #endif
  673 #ifdef INET6
  674                     cmd == SIOCSIFPHYADDR_IN6 ||
  675 #endif
  676                     0) {
  677                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  678                         if_link_state_change(ifp, LINK_STATE_UP);
  679                 }
  680         }
  681 bad:
  682         sx_xunlock(&gif_ioctl_sx);
  683         return (error);
  684 }
  685 
  686 static void
  687 gif_delete_tunnel(struct gif_softc *sc)
  688 {
  689 
  690         sx_assert(&gif_ioctl_sx, SA_XLOCKED);
  691         if (sc->gif_family != 0) {
  692                 CK_LIST_REMOVE(sc, chain);
  693                 /* Wait until it become safe to free gif_hdr */
  694                 GIF_WAIT();
  695                 free(sc->gif_hdr, M_GIF);
  696         }
  697         sc->gif_family = 0;
  698         GIF2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
  699         if_link_state_change(GIF2IFP(sc), LINK_STATE_DOWN);
  700 }
  701
Cache object: f2f71fbf721b6a26cc705344cf8124e8
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FreeBSD/Linux Kernel Cross Reference sys/net/if_gif.c

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