ip6_gre.c

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    1 /*-
    2  * Copyright (c) 2014, 2018 Andrey V. Elsukov <ae@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/12.0/sys/netinet6/ip6_gre.c 336676 2018-07-24 16:35:52Z andrew $");
   29 
   30 #include "opt_inet.h"
   31 #include "opt_inet6.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/jail.h>
   35 #include <sys/systm.h>
   36 #include <sys/socket.h>
   37 #include <sys/sockio.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/errno.h>
   40 #include <sys/kernel.h>
   41 #include <sys/sysctl.h>
   42 #include <sys/malloc.h>
   43 #include <sys/proc.h>
   44 
   45 #include <net/if.h>
   46 #include <net/if_var.h>
   47 #include <net/vnet.h>
   48 
   49 #include <netinet/in.h>
   50 #ifdef INET
   51 #include <net/ethernet.h>
   52 #include <netinet/ip.h>
   53 #endif
   54 #include <netinet/ip_encap.h>
   55 #include <netinet/ip6.h>
   56 #include <netinet6/ip6_var.h>
   57 #include <netinet6/in6_var.h>
   58 #include <netinet6/scope6_var.h>
   59 #include <net/if_gre.h>
   60 
   61 VNET_DEFINE(int, ip6_gre_hlim) = IPV6_DEFHLIM;
   62 #define V_ip6_gre_hlim          VNET(ip6_gre_hlim)
   63 
   64 SYSCTL_DECL(_net_inet6_ip6);
   65 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, grehlim, CTLFLAG_VNET | CTLFLAG_RW,
   66     &VNET_NAME(ip6_gre_hlim), 0, "Default hop limit for encapsulated packets");
   67 
   68 VNET_DEFINE_STATIC(struct gre_list *, ipv6_hashtbl) = NULL;
   69 #define V_ipv6_hashtbl          VNET(ipv6_hashtbl)
   70 #define GRE_HASH(src, dst)      (V_ipv6_hashtbl[\
   71     in6_gre_hashval((src), (dst)) & (GRE_HASH_SIZE - 1)])
   72 #define GRE_HASH_SC(sc)         GRE_HASH(&(sc)->gre_oip6.ip6_src,\
   73     &(sc)->gre_oip6.ip6_dst)
   74 
   75 static uint32_t
   76 in6_gre_hashval(const struct in6_addr *src, const struct in6_addr *dst)
   77 {
   78         uint32_t ret;
   79 
   80         ret = fnv_32_buf(src, sizeof(*src), FNV1_32_INIT);
   81         return (fnv_32_buf(dst, sizeof(*dst), ret));
   82 }
   83 
   84 static int
   85 in6_gre_checkdup(const struct gre_softc *sc, const struct in6_addr *src,
   86     const struct in6_addr *dst)
   87 {
   88         struct gre_softc *tmp;
   89 
   90         if (sc->gre_family == AF_INET6 &&
   91             IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src, src) &&
   92             IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst, dst))
   93                 return (EEXIST);
   94 
   95         CK_LIST_FOREACH(tmp, &GRE_HASH(src, dst), chain) {
   96                 if (tmp == sc)
   97                         continue;
   98                 if (IN6_ARE_ADDR_EQUAL(&tmp->gre_oip6.ip6_src, src) &&
   99                     IN6_ARE_ADDR_EQUAL(&tmp->gre_oip6.ip6_dst, dst))
  100                         return (EADDRNOTAVAIL);
  101         }
  102         return (0);
  103 }
  104 
  105 static int
  106 in6_gre_lookup(const struct mbuf *m, int off, int proto, void **arg)
  107 {
  108         const struct ip6_hdr *ip6;
  109         struct gre_softc *sc;
  110 
  111         if (V_ipv6_hashtbl == NULL)
  112                 return (0);
  113 
  114         MPASS(in_epoch(net_epoch_preempt));
  115         ip6 = mtod(m, const struct ip6_hdr *);
  116         CK_LIST_FOREACH(sc, &GRE_HASH(&ip6->ip6_dst, &ip6->ip6_src), chain) {
  117                 /*
  118                  * This is an inbound packet, its ip6_dst is source address
  119                  * in softc.
  120                  */
  121                 if (IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src,
  122                     &ip6->ip6_dst) &&
  123                     IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst,
  124                     &ip6->ip6_src)) {
  125                         if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
  126                                 return (0);
  127                         *arg = sc;
  128                         return (ENCAP_DRV_LOOKUP);
  129                 }
  130         }
  131         return (0);
  132 }
  133 
  134 static void
  135 in6_gre_attach(struct gre_softc *sc)
  136 {
  137 
  138         sc->gre_hlen = sizeof(struct greip6);
  139         sc->gre_oip6.ip6_vfc = IPV6_VERSION;
  140         sc->gre_oip6.ip6_nxt = IPPROTO_GRE;
  141         gre_updatehdr(sc, &sc->gre_gi6hdr->gi6_gre);
  142         CK_LIST_INSERT_HEAD(&GRE_HASH_SC(sc), sc, chain);
  143 }
  144 
  145 void
  146 in6_gre_setopts(struct gre_softc *sc, u_long cmd, uint32_t value)
  147 {
  148 
  149         MPASS(cmd == GRESKEY || cmd == GRESOPTS);
  150 
  151         /* NOTE: we are protected with gre_ioctl_sx lock */
  152         MPASS(sc->gre_family == AF_INET6);
  153         CK_LIST_REMOVE(sc, chain);
  154         GRE_WAIT();
  155         if (cmd == GRESKEY)
  156                 sc->gre_key = value;
  157         else
  158                 sc->gre_options = value;
  159         in6_gre_attach(sc);
  160 }
  161 
  162 int
  163 in6_gre_ioctl(struct gre_softc *sc, u_long cmd, caddr_t data)
  164 {
  165         struct in6_ifreq *ifr = (struct in6_ifreq *)data;
  166         struct sockaddr_in6 *dst, *src;
  167         struct ip6_hdr *ip6;
  168         int error;
  169 
  170         /* NOTE: we are protected with gre_ioctl_sx lock */
  171         error = EINVAL;
  172         switch (cmd) {
  173         case SIOCSIFPHYADDR_IN6:
  174                 src = &((struct in6_aliasreq *)data)->ifra_addr;
  175                 dst = &((struct in6_aliasreq *)data)->ifra_dstaddr;
  176 
  177                 /* sanity checks */
  178                 if (src->sin6_family != dst->sin6_family ||
  179                     src->sin6_family != AF_INET6 ||
  180                     src->sin6_len != dst->sin6_len ||
  181                     src->sin6_len != sizeof(*src))
  182                         break;
  183                 if (IN6_IS_ADDR_UNSPECIFIED(&src->sin6_addr) ||
  184                     IN6_IS_ADDR_UNSPECIFIED(&dst->sin6_addr)) {
  185                         error = EADDRNOTAVAIL;
  186                         break;
  187                 }
  188                 /*
  189                  * Check validity of the scope zone ID of the
  190                  * addresses, and convert it into the kernel
  191                  * internal form if necessary.
  192                  */
  193                 if ((error = sa6_embedscope(src, 0)) != 0 ||
  194                     (error = sa6_embedscope(dst, 0)) != 0)
  195                         break;
  196 
  197                 if (V_ipv6_hashtbl == NULL)
  198                         V_ipv6_hashtbl = gre_hashinit();
  199                 error = in6_gre_checkdup(sc, &src->sin6_addr,
  200                     &dst->sin6_addr);
  201                 if (error == EADDRNOTAVAIL)
  202                         break;
  203                 if (error == EEXIST) {
  204                         /* Addresses are the same. Just return. */
  205                         error = 0;
  206                         break;
  207                 }
  208                 ip6 = malloc(sizeof(struct greip6) + 3 * sizeof(uint32_t),
  209                     M_GRE, M_WAITOK | M_ZERO);
  210                 ip6->ip6_src = src->sin6_addr;
  211                 ip6->ip6_dst = dst->sin6_addr;
  212                 if (sc->gre_family != 0) {
  213                         /* Detach existing tunnel first */
  214                         CK_LIST_REMOVE(sc, chain);
  215                         GRE_WAIT();
  216                         free(sc->gre_hdr, M_GRE);
  217                         /* XXX: should we notify about link state change? */
  218                 }
  219                 sc->gre_family = AF_INET6;
  220                 sc->gre_hdr = ip6;
  221                 sc->gre_oseq = 0;
  222                 sc->gre_iseq = UINT32_MAX;
  223                 in6_gre_attach(sc);
  224                 break;
  225         case SIOCGIFPSRCADDR_IN6:
  226         case SIOCGIFPDSTADDR_IN6:
  227                 if (sc->gre_family != AF_INET6) {
  228                         error = EADDRNOTAVAIL;
  229                         break;
  230                 }
  231                 src = (struct sockaddr_in6 *)&ifr->ifr_addr;
  232                 memset(src, 0, sizeof(*src));
  233                 src->sin6_family = AF_INET6;
  234                 src->sin6_len = sizeof(*src);
  235                 src->sin6_addr = (cmd == SIOCGIFPSRCADDR_IN6) ?
  236                     sc->gre_oip6.ip6_src: sc->gre_oip6.ip6_dst;
  237                 error = prison_if(curthread->td_ucred, (struct sockaddr *)src);
  238                 if (error == 0)
  239                         error = sa6_recoverscope(src);
  240                 if (error != 0)
  241                         memset(src, 0, sizeof(*src));
  242                 break;
  243         }
  244         return (error);
  245 }
  246 
  247 int
  248 in6_gre_output(struct mbuf *m, int af __unused, int hlen __unused)
  249 {
  250         struct greip6 *gi6;
  251 
  252         gi6 = mtod(m, struct greip6 *);
  253         gi6->gi6_ip6.ip6_hlim = V_ip6_gre_hlim;
  254         return (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, NULL));
  255 }
  256 
  257 static const struct encaptab *ecookie = NULL;
  258 static const struct encap_config ipv6_encap_cfg = {
  259         .proto = IPPROTO_GRE,
  260         .min_length = sizeof(struct greip6) +
  261 #ifdef INET
  262             sizeof(struct ip),
  263 #else
  264             sizeof(struct ip6_hdr),
  265 #endif
  266         .exact_match = ENCAP_DRV_LOOKUP,
  267         .lookup = in6_gre_lookup,
  268         .input = gre_input
  269 };
  270 
  271 void
  272 in6_gre_init(void)
  273 {
  274 
  275         if (!IS_DEFAULT_VNET(curvnet))
  276                 return;
  277         ecookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK);
  278 }
  279 
  280 void
  281 in6_gre_uninit(void)
  282 {
  283 
  284         if (IS_DEFAULT_VNET(curvnet))
  285                 ip6_encap_detach(ecookie);
  286         if (V_ipv6_hashtbl != NULL)
  287                 gre_hashdestroy(V_ipv6_hashtbl);
  288 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/ip6_gre.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ip6_gre.c
