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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-NetBSD
    3  *
    4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    5  * Copyright (c) 2014, 2018 Andrey V. Elsukov <ae@FreeBSD.org>
    6  * All rights reserved.
    7  *
    8  * This code is derived from software contributed to The NetBSD Foundation
    9  * by Heiko W.Rupp <hwr@pilhuhn.de>
   10  *
   11  * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de>
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   32  * POSSIBILITY OF SUCH DAMAGE.
   33  *
   34  * $NetBSD: ip_gre.c,v 1.29 2003/09/05 23:02:43 itojun Exp $
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 #include "opt_inet.h"
   41 #include "opt_inet6.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/jail.h>
   45 #include <sys/systm.h>
   46 #include <sys/socket.h>
   47 #include <sys/socketvar.h>
   48 #include <sys/sockio.h>
   49 #include <sys/mbuf.h>
   50 #include <sys/errno.h>
   51 #include <sys/kernel.h>
   52 #include <sys/sysctl.h>
   53 #include <sys/malloc.h>
   54 #include <sys/proc.h>
   55 
   56 #include <net/if.h>
   57 #include <net/if_var.h>
   58 #include <net/vnet.h>
   59 
   60 #include <netinet/in.h>
   61 #include <netinet/in_var.h>
   62 #include <netinet/in_pcb.h>
   63 #include <netinet/ip.h>
   64 #include <netinet/ip_encap.h>
   65 #include <netinet/ip_var.h>
   66 #include <netinet/udp.h>
   67 #include <netinet/udp_var.h>
   68 
   69 #ifdef INET6
   70 #include <netinet/ip6.h>
   71 #endif
   72 
   73 #include <net/if_gre.h>
   74 #include <machine/in_cksum.h>
   75 
   76 #define GRE_TTL                 30
   77 VNET_DEFINE(int, ip_gre_ttl) = GRE_TTL;
   78 #define V_ip_gre_ttl            VNET(ip_gre_ttl)
   79 SYSCTL_INT(_net_inet_ip, OID_AUTO, grettl, CTLFLAG_VNET | CTLFLAG_RW,
   80     &VNET_NAME(ip_gre_ttl), 0, "Default TTL value for encapsulated packets");
   81 
   82 struct in_gre_socket {
   83         struct gre_socket               base;
   84         in_addr_t                       addr;
   85 };
   86 VNET_DEFINE_STATIC(struct gre_sockets *, ipv4_sockets) = NULL;
   87 VNET_DEFINE_STATIC(struct gre_list *, ipv4_hashtbl) = NULL;
   88 VNET_DEFINE_STATIC(struct gre_list *, ipv4_srchashtbl) = NULL;
   89 #define V_ipv4_sockets          VNET(ipv4_sockets)
   90 #define V_ipv4_hashtbl          VNET(ipv4_hashtbl)
   91 #define V_ipv4_srchashtbl       VNET(ipv4_srchashtbl)
   92 #define GRE_HASH(src, dst)      (V_ipv4_hashtbl[\
   93     in_gre_hashval((src), (dst)) & (GRE_HASH_SIZE - 1)])
   94 #define GRE_SRCHASH(src)        (V_ipv4_srchashtbl[\
   95     fnv_32_buf(&(src), sizeof(src), FNV1_32_INIT) & (GRE_HASH_SIZE - 1)])
   96 #define GRE_SOCKHASH(src)       (V_ipv4_sockets[\
   97     fnv_32_buf(&(src), sizeof(src), FNV1_32_INIT) & (GRE_HASH_SIZE - 1)])
   98 #define GRE_HASH_SC(sc)         GRE_HASH((sc)->gre_oip.ip_src.s_addr,\
   99     (sc)->gre_oip.ip_dst.s_addr)
  100 
  101 static uint32_t
  102 in_gre_hashval(in_addr_t src, in_addr_t dst)
  103 {
  104         uint32_t ret;
  105 
  106         ret = fnv_32_buf(&src, sizeof(src), FNV1_32_INIT);
  107         return (fnv_32_buf(&dst, sizeof(dst), ret));
  108 }
  109 
  110 static struct gre_socket*
  111 in_gre_lookup_socket(in_addr_t addr)
  112 {
  113         struct gre_socket *gs;
  114         struct in_gre_socket *s;
  115 
  116         CK_LIST_FOREACH(gs, &GRE_SOCKHASH(addr), chain) {
  117                 s = __containerof(gs, struct in_gre_socket, base);
  118                 if (s->addr == addr)
  119                         break;
  120         }
  121         return (gs);
  122 }
  123 
  124 static int
  125 in_gre_checkdup(const struct gre_softc *sc, in_addr_t src, in_addr_t dst,
  126     uint32_t opts)
  127 {
  128         struct gre_list *head;
  129         struct gre_softc *tmp;
  130         struct gre_socket *gs;
  131 
  132         if (sc->gre_family == AF_INET &&
  133             sc->gre_oip.ip_src.s_addr == src &&
  134             sc->gre_oip.ip_dst.s_addr == dst &&
  135             (sc->gre_options & GRE_UDPENCAP) == (opts & GRE_UDPENCAP))
  136                 return (EEXIST);
  137 
  138         if (opts & GRE_UDPENCAP) {
  139                 gs = in_gre_lookup_socket(src);
  140                 if (gs == NULL)
  141                         return (0);
  142                 head = &gs->list;
  143         } else
  144                 head = &GRE_HASH(src, dst);
  145 
  146         CK_LIST_FOREACH(tmp, head, chain) {
  147                 if (tmp == sc)
  148                         continue;
  149                 if (tmp->gre_oip.ip_src.s_addr == src &&
  150                     tmp->gre_oip.ip_dst.s_addr == dst)
  151                         return (EADDRNOTAVAIL);
  152         }
  153         return (0);
  154 }
  155 
  156 static int
  157 in_gre_lookup(const struct mbuf *m, int off, int proto, void **arg)
  158 {
  159         const struct ip *ip;
  160         struct gre_softc *sc;
  161 
  162         if (V_ipv4_hashtbl == NULL)
  163                 return (0);
  164 
  165         NET_EPOCH_ASSERT();
  166         ip = mtod(m, const struct ip *);
  167         CK_LIST_FOREACH(sc, &GRE_HASH(ip->ip_dst.s_addr,
  168             ip->ip_src.s_addr), chain) {
  169                 /*
  170                  * This is an inbound packet, its ip_dst is source address
  171                  * in softc.
  172                  */
  173                 if (sc->gre_oip.ip_src.s_addr == ip->ip_dst.s_addr &&
  174                     sc->gre_oip.ip_dst.s_addr == ip->ip_src.s_addr) {
  175                         if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
  176                                 return (0);
  177                         *arg = sc;
  178                         return (ENCAP_DRV_LOOKUP);
  179                 }
  180         }
  181         return (0);
  182 }
  183 
  184 /*
  185  * Check that ingress address belongs to local host.
  186  */
  187 static void
  188 in_gre_set_running(struct gre_softc *sc)
  189 {
  190 
  191         if (in_localip(sc->gre_oip.ip_src))
  192                 GRE2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
  193         else
  194                 GRE2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
  195 }
  196 
  197 /*
  198  * ifaddr_event handler.
  199  * Clear IFF_DRV_RUNNING flag when ingress address disappears to prevent
  200  * source address spoofing.
  201  */
  202 static void
  203 in_gre_srcaddr(void *arg __unused, const struct sockaddr *sa,
  204     int event __unused)
  205 {
  206         const struct sockaddr_in *sin;
  207         struct gre_softc *sc;
  208 
  209         /* Check that VNET is ready */
  210         if (V_ipv4_hashtbl == NULL)
  211                 return;
  212 
  213         NET_EPOCH_ASSERT();
  214         sin = (const struct sockaddr_in *)sa;
  215         CK_LIST_FOREACH(sc, &GRE_SRCHASH(sin->sin_addr.s_addr), srchash) {
  216                 if (sc->gre_oip.ip_src.s_addr != sin->sin_addr.s_addr)
  217                         continue;
  218                 in_gre_set_running(sc);
  219         }
  220 }
  221 
  222 static bool
  223 in_gre_udp_input(struct mbuf *m, int off, struct inpcb *inp,
  224     const struct sockaddr *sa, void *ctx)
  225 {
  226         struct gre_socket *gs;
  227         struct gre_softc *sc;
  228         in_addr_t dst;
  229 
  230         NET_EPOCH_ASSERT();
  231 
  232         gs = (struct gre_socket *)ctx;
  233         dst = ((const struct sockaddr_in *)sa)->sin_addr.s_addr;
  234         CK_LIST_FOREACH(sc, &gs->list, chain) {
  235                 if (sc->gre_oip.ip_dst.s_addr == dst)
  236                         break;
  237         }
  238         if (sc != NULL && (GRE2IFP(sc)->if_flags & IFF_UP) != 0){
  239                 gre_input(m, off + sizeof(struct udphdr), IPPROTO_UDP, sc);
  240                 return (true);
  241         }
  242         m_freem(m);
  243 
  244         return (true);
  245 }
  246 
  247 static int
  248 in_gre_setup_socket(struct gre_softc *sc)
  249 {
  250         struct sockopt sopt;
  251         struct sockaddr_in sin;
  252         struct in_gre_socket *s;
  253         struct gre_socket *gs;
  254         in_addr_t addr;
  255         int error, value;
  256 
  257         /*
  258          * NOTE: we are protected with gre_ioctl_sx lock.
  259          *
  260          * First check that socket is already configured.
  261          * If so, check that source address was not changed.
  262          * If address is different, check that there are no other tunnels
  263          * and close socket.
  264          */
  265         addr = sc->gre_oip.ip_src.s_addr;
  266         gs = sc->gre_so;
  267         if (gs != NULL) {
  268                 s = __containerof(gs, struct in_gre_socket, base);
  269                 if (s->addr != addr) {
  270                         if (CK_LIST_EMPTY(&gs->list)) {
  271                                 CK_LIST_REMOVE(gs, chain);
  272                                 soclose(gs->so);
  273                                 NET_EPOCH_CALL(gre_sofree, &gs->epoch_ctx);
  274                         }
  275                         gs = sc->gre_so = NULL;
  276                 }
  277         }
  278 
  279         if (gs == NULL) {
  280                 /*
  281                  * Check that socket for given address is already
  282                  * configured.
  283                  */
  284                 gs = in_gre_lookup_socket(addr);
  285                 if (gs == NULL) {
  286                         s = malloc(sizeof(*s), M_GRE, M_WAITOK | M_ZERO);
  287                         s->addr = addr;
  288                         gs = &s->base;
  289 
  290                         error = socreate(sc->gre_family, &gs->so,
  291                             SOCK_DGRAM, IPPROTO_UDP, curthread->td_ucred,
  292                             curthread);
  293                         if (error != 0) {
  294                                 if_printf(GRE2IFP(sc),
  295                                     "cannot create socket: %d\n", error);
  296                                 free(s, M_GRE);
  297                                 return (error);
  298                         }
  299 
  300                         error = udp_set_kernel_tunneling(gs->so,
  301                             in_gre_udp_input, NULL, gs);
  302                         if (error != 0) {
  303                                 if_printf(GRE2IFP(sc),
  304                                     "cannot set UDP tunneling: %d\n", error);
  305                                 goto fail;
  306                         }
  307 
  308                         memset(&sopt, 0, sizeof(sopt));
  309                         sopt.sopt_dir = SOPT_SET;
  310                         sopt.sopt_level = IPPROTO_IP;
  311                         sopt.sopt_name = IP_BINDANY;
  312                         sopt.sopt_val = &value;
  313                         sopt.sopt_valsize = sizeof(value);
  314                         value = 1;
  315                         error = sosetopt(gs->so, &sopt);
  316                         if (error != 0) {
  317                                 if_printf(GRE2IFP(sc),
  318                                     "cannot set IP_BINDANY opt: %d\n", error);
  319                                 goto fail;
  320                         }
  321 
  322                         memset(&sin, 0, sizeof(sin));
  323                         sin.sin_family = AF_INET;
  324                         sin.sin_len = sizeof(sin);
  325                         sin.sin_addr.s_addr = addr;
  326                         sin.sin_port = htons(GRE_UDPPORT);
  327                         error = sobind(gs->so, (struct sockaddr *)&sin,
  328                             curthread);
  329                         if (error != 0) {
  330                                 if_printf(GRE2IFP(sc),
  331                                     "cannot bind socket: %d\n", error);
  332                                 goto fail;
  333                         }
  334                         /* Add socket to the chain */
  335                         CK_LIST_INSERT_HEAD(&GRE_SOCKHASH(addr), gs, chain);
  336                 }
  337         }
  338 
  339         /* Add softc to the socket's list */
  340         CK_LIST_INSERT_HEAD(&gs->list, sc, chain);
  341         sc->gre_so = gs;
  342         return (0);
  343 fail:
  344         soclose(gs->so);
  345         free(s, M_GRE);
  346         return (error);
  347 }
  348 
  349 static int
  350 in_gre_attach(struct gre_softc *sc)
  351 {
  352         struct epoch_tracker et;
  353         struct grehdr *gh;
  354         int error;
  355 
  356         if (sc->gre_options & GRE_UDPENCAP) {
  357                 sc->gre_csumflags = CSUM_UDP;
  358                 sc->gre_hlen = sizeof(struct greudp);
  359                 sc->gre_oip.ip_p = IPPROTO_UDP;
  360                 gh = &sc->gre_udphdr->gi_gre;
  361                 gre_update_udphdr(sc, &sc->gre_udp,
  362                     in_pseudo(sc->gre_oip.ip_src.s_addr,
  363                     sc->gre_oip.ip_dst.s_addr, 0));
  364         } else {
  365                 sc->gre_hlen = sizeof(struct greip);
  366                 sc->gre_oip.ip_p = IPPROTO_GRE;
  367                 gh = &sc->gre_iphdr->gi_gre;
  368         }
  369         sc->gre_oip.ip_v = IPVERSION;
  370         sc->gre_oip.ip_hl = sizeof(struct ip) >> 2;
  371         gre_update_hdr(sc, gh);
  372 
  373         /*
  374          * If we return error, this means that sc is not linked,
  375          * and caller should reset gre_family and free(sc->gre_hdr).
  376          */
  377         if (sc->gre_options & GRE_UDPENCAP) {
  378                 error = in_gre_setup_socket(sc);
  379                 if (error != 0)
  380                         return (error);
  381         } else
  382                 CK_LIST_INSERT_HEAD(&GRE_HASH_SC(sc), sc, chain);
  383         CK_LIST_INSERT_HEAD(&GRE_SRCHASH(sc->gre_oip.ip_src.s_addr),
  384             sc, srchash);
  385 
  386         /* Set IFF_DRV_RUNNING if interface is ready */
  387         NET_EPOCH_ENTER(et);
  388         in_gre_set_running(sc);
  389         NET_EPOCH_EXIT(et);
  390         return (0);
  391 }
  392 
  393 int
  394 in_gre_setopts(struct gre_softc *sc, u_long cmd, uint32_t value)
  395 {
  396         int error;
  397 
  398         /* NOTE: we are protected with gre_ioctl_sx lock */
  399         MPASS(cmd == GRESKEY || cmd == GRESOPTS || cmd == GRESPORT);
  400         MPASS(sc->gre_family == AF_INET);
  401 
  402         /*
  403          * If we are going to change encapsulation protocol, do check
  404          * for duplicate tunnels. Return EEXIST here to do not confuse
  405          * user.
  406          */
  407         if (cmd == GRESOPTS &&
  408             (sc->gre_options & GRE_UDPENCAP) != (value & GRE_UDPENCAP) &&
  409             in_gre_checkdup(sc, sc->gre_oip.ip_src.s_addr,
  410                 sc->gre_oip.ip_dst.s_addr, value) == EADDRNOTAVAIL)
  411                 return (EEXIST);
  412 
  413         CK_LIST_REMOVE(sc, chain);
  414         CK_LIST_REMOVE(sc, srchash);
  415         GRE_WAIT();
  416         switch (cmd) {
  417         case GRESKEY:
  418                 sc->gre_key = value;
  419                 break;
  420         case GRESOPTS:
  421                 sc->gre_options = value;
  422                 break;
  423         case GRESPORT:
  424                 sc->gre_port = value;
  425                 break;
  426         }
  427         error = in_gre_attach(sc);
  428         if (error != 0) {
  429                 sc->gre_family = 0;
  430                 free(sc->gre_hdr, M_GRE);
  431         }
  432         return (error);
  433 }
  434 
  435 int
  436 in_gre_ioctl(struct gre_softc *sc, u_long cmd, caddr_t data)
  437 {
  438         struct ifreq *ifr = (struct ifreq *)data;
  439         struct sockaddr_in *dst, *src;
  440         struct ip *ip;
  441         int error;
  442 
  443         /* NOTE: we are protected with gre_ioctl_sx lock */
  444         error = EINVAL;
  445         switch (cmd) {
  446         case SIOCSIFPHYADDR:
  447                 src = &((struct in_aliasreq *)data)->ifra_addr;
  448                 dst = &((struct in_aliasreq *)data)->ifra_dstaddr;
  449 
  450                 /* sanity checks */
  451                 if (src->sin_family != dst->sin_family ||
  452                     src->sin_family != AF_INET ||
  453                     src->sin_len != dst->sin_len ||
  454                     src->sin_len != sizeof(*src))
  455                         break;
  456                 if (src->sin_addr.s_addr == INADDR_ANY ||
  457                     dst->sin_addr.s_addr == INADDR_ANY) {
  458                         error = EADDRNOTAVAIL;
  459                         break;
  460                 }
  461                 if (V_ipv4_hashtbl == NULL) {
  462                         V_ipv4_hashtbl = gre_hashinit();
  463                         V_ipv4_srchashtbl = gre_hashinit();
  464                         V_ipv4_sockets = (struct gre_sockets *)gre_hashinit();
  465                 }
  466                 error = in_gre_checkdup(sc, src->sin_addr.s_addr,
  467                     dst->sin_addr.s_addr, sc->gre_options);
  468                 if (error == EADDRNOTAVAIL)
  469                         break;
  470                 if (error == EEXIST) {
  471                         /* Addresses are the same. Just return. */
  472                         error = 0;
  473                         break;
  474                 }
  475                 ip = malloc(sizeof(struct greudp) + 3 * sizeof(uint32_t),
  476                     M_GRE, M_WAITOK | M_ZERO);
  477                 ip->ip_src.s_addr = src->sin_addr.s_addr;
  478                 ip->ip_dst.s_addr = dst->sin_addr.s_addr;
  479                 if (sc->gre_family != 0) {
  480                         /* Detach existing tunnel first */
  481                         CK_LIST_REMOVE(sc, chain);
  482                         CK_LIST_REMOVE(sc, srchash);
  483                         GRE_WAIT();
  484                         free(sc->gre_hdr, M_GRE);
  485                         /* XXX: should we notify about link state change? */
  486                 }
  487                 sc->gre_family = AF_INET;
  488                 sc->gre_hdr = ip;
  489                 sc->gre_oseq = 0;
  490                 sc->gre_iseq = UINT32_MAX;
  491                 error = in_gre_attach(sc);
  492                 if (error != 0) {
  493                         sc->gre_family = 0;
  494                         free(sc->gre_hdr, M_GRE);
  495                 }
  496                 break;
  497         case SIOCGIFPSRCADDR:
  498         case SIOCGIFPDSTADDR:
  499                 if (sc->gre_family != AF_INET) {
  500                         error = EADDRNOTAVAIL;
  501                         break;
  502                 }
  503                 src = (struct sockaddr_in *)&ifr->ifr_addr;
  504                 memset(src, 0, sizeof(*src));
  505                 src->sin_family = AF_INET;
  506                 src->sin_len = sizeof(*src);
  507                 src->sin_addr = (cmd == SIOCGIFPSRCADDR) ?
  508                     sc->gre_oip.ip_src: sc->gre_oip.ip_dst;
  509                 error = prison_if(curthread->td_ucred, (struct sockaddr *)src);
  510                 if (error != 0)
  511                         memset(src, 0, sizeof(*src));
  512                 break;
  513         }
  514         return (error);
  515 }
  516 
  517 int
  518 in_gre_output(struct mbuf *m, int af, int hlen)
  519 {
  520         struct greip *gi;
  521 
  522         gi = mtod(m, struct greip *);
  523         switch (af) {
  524         case AF_INET:
  525                 /*
  526                  * gre_transmit() has used M_PREPEND() that doesn't guarantee
  527                  * m_data is contiguous more than hlen bytes. Use m_copydata()
  528                  * here to avoid m_pullup().
  529                  */
  530                 m_copydata(m, hlen + offsetof(struct ip, ip_tos),
  531                     sizeof(u_char), &gi->gi_ip.ip_tos);
  532                 m_copydata(m, hlen + offsetof(struct ip, ip_id),
  533                     sizeof(u_short), (caddr_t)&gi->gi_ip.ip_id);
  534                 break;
  535 #ifdef INET6
  536         case AF_INET6:
  537                 gi->gi_ip.ip_tos = 0; /* XXX */
  538                 ip_fillid(&gi->gi_ip);
  539                 break;
  540 #endif
  541         }
  542         gi->gi_ip.ip_ttl = V_ip_gre_ttl;
  543         gi->gi_ip.ip_len = htons(m->m_pkthdr.len);
  544         return (ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL));
  545 }
  546 
  547 static const struct srcaddrtab *ipv4_srcaddrtab = NULL;
  548 static const struct encaptab *ecookie = NULL;
  549 static const struct encap_config ipv4_encap_cfg = {
  550         .proto = IPPROTO_GRE,
  551         .min_length = sizeof(struct greip) + sizeof(struct ip),
  552         .exact_match = ENCAP_DRV_LOOKUP,
  553         .lookup = in_gre_lookup,
  554         .input = gre_input
  555 };
  556 
  557 void
  558 in_gre_init(void)
  559 {
  560 
  561         if (!IS_DEFAULT_VNET(curvnet))
  562                 return;
  563         ipv4_srcaddrtab = ip_encap_register_srcaddr(in_gre_srcaddr,
  564             NULL, M_WAITOK);
  565         ecookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
  566 }
  567 
  568 void
  569 in_gre_uninit(void)
  570 {
  571 
  572         if (IS_DEFAULT_VNET(curvnet)) {
  573                 ip_encap_detach(ecookie);
  574                 ip_encap_unregister_srcaddr(ipv4_srcaddrtab);
  575         }
  576         if (V_ipv4_hashtbl != NULL) {
  577                 gre_hashdestroy(V_ipv4_hashtbl);
  578                 V_ipv4_hashtbl = NULL;
  579                 GRE_WAIT();
  580                 gre_hashdestroy(V_ipv4_srchashtbl);
  581                 gre_hashdestroy((struct gre_list *)V_ipv4_sockets);
  582         }
  583 }

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