send.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009-2010 Ana Kukec <anchie@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/malloc.h>
   35 #include <sys/mbuf.h>
   36 #include <sys/module.h>
   37 #include <sys/priv.h>
   38 #include <sys/protosw.h>
   39 #include <sys/sdt.h>
   40 #include <sys/systm.h>
   41 #include <sys/socket.h>
   42 #include <sys/sockbuf.h>
   43 #include <sys/socketvar.h>
   44 #include <sys/types.h>
   45 
   46 #include <net/route.h>
   47 #include <net/if.h>
   48 #include <net/if_var.h>
   49 #include <net/vnet.h>
   50 
   51 #include <netinet/in.h>
   52 #include <netinet/in_kdtrace.h>
   53 #include <netinet/ip_var.h>
   54 #include <netinet/ip6.h>
   55 #include <netinet/icmp6.h>
   56 
   57 #include <netinet6/in6_var.h>
   58 #include <netinet6/nd6.h>
   59 #include <netinet6/scope6_var.h>
   60 #include <netinet6/send.h>
   61 
   62 static MALLOC_DEFINE(M_SEND, "send", "Secure Neighbour Discovery");
   63 
   64 /*
   65  * The socket used to communicate with the SeND daemon.
   66  */
   67 VNET_DEFINE_STATIC(struct socket *, send_so);
   68 #define V_send_so       VNET(send_so)
   69 
   70 u_long  send_sendspace  = 8 * (1024 + sizeof(struct sockaddr_send));
   71 u_long  send_recvspace  = 9216;
   72 
   73 struct mtx      send_mtx;
   74 #define SEND_LOCK_INIT()        mtx_init(&send_mtx, "send_mtx", NULL, MTX_DEF)
   75 #define SEND_LOCK()             mtx_lock(&send_mtx)
   76 #define SEND_UNLOCK()           mtx_unlock(&send_mtx)
   77 #define SEND_LOCK_DESTROY()     mtx_destroy(&send_mtx)
   78 
   79 static int
   80 send_attach(struct socket *so, int proto, struct thread *td)
   81 {
   82         int error;
   83 
   84         SEND_LOCK();
   85         if (V_send_so != NULL) {
   86                 SEND_UNLOCK();
   87                 return (EEXIST);
   88         }
   89 
   90         error = priv_check(td, PRIV_NETINET_RAW);
   91         if (error) {
   92                 SEND_UNLOCK();
   93                 return(error);
   94         }
   95 
   96         if (proto != IPPROTO_SEND) {
   97                 SEND_UNLOCK();
   98                 return (EPROTONOSUPPORT);
   99         }
  100         error = soreserve(so, send_sendspace, send_recvspace);
  101         if (error) {
  102                 SEND_UNLOCK();
  103                 return(error);
  104         }
  105 
  106         V_send_so = so;
  107         SEND_UNLOCK();
  108 
  109         return (0);
  110 }
  111 
  112 static int
  113 send_output(struct mbuf *m, struct ifnet *ifp, int direction)
  114 {
  115         struct ip6_hdr *ip6;
  116         struct sockaddr_in6 dst;
  117         struct icmp6_hdr *icmp6;
  118         struct epoch_tracker et;
  119         int icmp6len;
  120         int error;
  121 
  122         /*
  123          * Receive incoming (SeND-protected) or outgoing traffic
  124          * (SeND-validated) from the SeND user space application.
  125          */
  126 
  127         switch (direction) {
  128         case SND_IN:
  129                 if (m->m_len < (sizeof(struct ip6_hdr) +
  130                     sizeof(struct icmp6_hdr))) {
  131                         m = m_pullup(m, sizeof(struct ip6_hdr) +
  132                             sizeof(struct icmp6_hdr));
  133                         if (!m)
  134                                 return (ENOBUFS);
  135                 }
  136 
  137                 /* Before passing off the mbuf record the proper interface. */
  138                 m->m_pkthdr.rcvif = ifp;
  139 
  140                 if (m->m_flags & M_PKTHDR)
  141                         icmp6len = m->m_pkthdr.len - sizeof(struct ip6_hdr);
  142                 else
  143                         panic("Doh! not the first mbuf.");
  144 
  145                 ip6 = mtod(m, struct ip6_hdr *);
  146                 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
  147                 error = 0;
  148 
  149                 /*
  150                  * Output the packet as icmp6.c:icpm6_input() would do.
  151                  * The mbuf is always consumed, so we do not have to
  152                  * care about that.
  153                  */
  154                 NET_EPOCH_ENTER(et);
  155                 switch (icmp6->icmp6_type) {
  156                 case ND_NEIGHBOR_SOLICIT:
  157                         NET_EPOCH_ENTER(et);
  158                         nd6_ns_input(m, sizeof(struct ip6_hdr), icmp6len);
  159                         NET_EPOCH_EXIT(et);
  160                         break;
  161                 case ND_NEIGHBOR_ADVERT:
  162                         nd6_na_input(m, sizeof(struct ip6_hdr), icmp6len);
  163                         break;
  164                 case ND_REDIRECT:
  165                         icmp6_redirect_input(m, sizeof(struct ip6_hdr));
  166                         break;
  167                 case ND_ROUTER_SOLICIT:
  168                         nd6_rs_input(m, sizeof(struct ip6_hdr), icmp6len);
  169                         break;
  170                 case ND_ROUTER_ADVERT:
  171                         nd6_ra_input(m, sizeof(struct ip6_hdr), icmp6len);
  172                         break;
  173                 default:
  174                         m_freem(m);
  175                         error = ENOSYS;
  176                 }
  177                 NET_EPOCH_EXIT(et);
  178 
  179                 return (error);
  180 
  181         case SND_OUT:
  182                 if (m->m_len < sizeof(struct ip6_hdr)) {
  183                         m = m_pullup(m, sizeof(struct ip6_hdr));
  184                         if (!m)
  185                                 return (ENOBUFS);
  186                 }
  187                 ip6 = mtod(m, struct ip6_hdr *);
  188                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
  189                         m->m_flags |= M_MCAST;
  190 
  191                 bzero(&dst, sizeof(dst));
  192                 dst.sin6_family = AF_INET6;
  193                 dst.sin6_len = sizeof(dst);
  194                 dst.sin6_addr = ip6->ip6_dst;
  195 
  196                 m_clrprotoflags(m);     /* Avoid confusing lower layers. */
  197 
  198                 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
  199 
  200                 /*
  201                  * Output the packet as nd6.c:nd6_output_lle() would do.
  202                  * The mbuf is always consumed, so we do not have to care
  203                  * about that.
  204                  * XXX-BZ as we added data, what about fragmenting,
  205                  * if now needed?
  206                  */
  207                 error = ((*ifp->if_output)(ifp, m, (struct sockaddr *)&dst,
  208                     NULL));
  209                 if (error)
  210                         error = ENOENT;
  211                 return (error);
  212 
  213         default:
  214                 panic("%s: direction %d neither SND_IN nor SND_OUT.",
  215                      __func__, direction);
  216         }
  217 }
  218 
  219 /*
  220  * Receive a SeND message from user space to be either send out by the kernel
  221  * or, with SeND ICMPv6 options removed, to be further processed by the icmp6
  222  * input path.
  223  */
  224 static int
  225 send_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  226     struct mbuf *control, struct thread *td)
  227 {
  228         struct sockaddr_send *sendsrc;
  229         struct ifnet *ifp;
  230         int error;
  231 
  232         KASSERT(V_send_so == so, ("%s: socket %p not send socket %p",
  233                 __func__, so, V_send_so));
  234 
  235         sendsrc = (struct sockaddr_send *)nam;
  236         if (sendsrc->send_family != AF_INET6) {
  237                 error = EAFNOSUPPORT;
  238                 goto err;
  239         }
  240         if (sendsrc->send_len != sizeof(*sendsrc)) {
  241                 error = EINVAL;
  242                 goto err;
  243         }
  244         ifp = ifnet_byindex_ref(sendsrc->send_ifidx);
  245         if (ifp == NULL) {
  246                 error = ENETUNREACH;
  247                 goto err;
  248         }
  249 
  250         error = send_output(m, ifp, sendsrc->send_direction);
  251         if_rele(ifp);
  252         m = NULL;
  253 
  254 err:
  255         if (control != NULL)
  256                 m_freem(control);
  257         if (m != NULL)
  258                 m_freem(m);
  259 
  260         return (error);
  261 }
  262 
  263 static void
  264 send_close(struct socket *so)
  265 {
  266 
  267         SEND_LOCK();
  268         if (V_send_so)
  269                 V_send_so = NULL;
  270         SEND_UNLOCK();
  271 }
  272 
  273 /*
  274  * Send a SeND message to user space, that was either received and has to be
  275  * validated or was about to be send out and has to be handled by the SEND
  276  * daemon adding SeND ICMPv6 options.
  277  */
  278 static int
  279 send_input(struct mbuf *m, struct ifnet *ifp, int direction, int msglen __unused)
  280 {
  281         struct ip6_hdr *ip6;
  282         struct sockaddr_send sendsrc;
  283 
  284         SEND_LOCK();
  285         if (V_send_so == NULL) {
  286                 SEND_UNLOCK();
  287                 return (-1);
  288         }
  289 
  290         /*
  291          * Make sure to clear any possible internally embedded scope before
  292          * passing the packet to user space for SeND cryptographic signature
  293          * validation to succeed.
  294          */
  295         ip6 = mtod(m, struct ip6_hdr *);
  296         in6_clearscope(&ip6->ip6_src);
  297         in6_clearscope(&ip6->ip6_dst);
  298 
  299         bzero(&sendsrc, sizeof(sendsrc));
  300         sendsrc.send_len = sizeof(sendsrc);
  301         sendsrc.send_family = AF_INET6;
  302         sendsrc.send_direction = direction;
  303         sendsrc.send_ifidx = ifp->if_index;
  304 
  305         /*
  306          * Send incoming or outgoing traffic to user space either to be
  307          * protected (outgoing) or validated (incoming) according to rfc3971.
  308          */
  309         SOCKBUF_LOCK(&V_send_so->so_rcv);
  310         if (sbappendaddr_locked(&V_send_so->so_rcv,
  311             (struct sockaddr *)&sendsrc, m, NULL) == 0) {
  312                 soroverflow_locked(V_send_so);
  313                 /* XXX stats. */
  314                 m_freem(m);
  315         } else {
  316                 sorwakeup_locked(V_send_so);
  317         }
  318 
  319         SEND_UNLOCK();
  320         return (0);
  321 }
  322 
  323 struct pr_usrreqs send_usrreqs = {
  324         .pru_attach =           send_attach,
  325         .pru_send =             send_send,
  326         .pru_detach =           send_close
  327 };
  328 struct protosw send_protosw = {
  329         .pr_type =              SOCK_RAW,
  330         .pr_flags =             PR_ATOMIC|PR_ADDR,
  331         .pr_protocol =          IPPROTO_SEND,
  332         .pr_usrreqs =           &send_usrreqs
  333 };
  334 
  335 static int
  336 send_modevent(module_t mod, int type, void *unused)
  337 {
  338 #ifdef __notyet__
  339         VNET_ITERATOR_DECL(vnet_iter);
  340 #endif
  341         int error;
  342 
  343         switch (type) {
  344         case MOD_LOAD:
  345                 SEND_LOCK_INIT();
  346 
  347                 error = pf_proto_register(PF_INET6, &send_protosw);
  348                 if (error != 0) {
  349                         printf("%s:%d: MOD_LOAD pf_proto_register(): %d\n",
  350                            __func__, __LINE__, error);
  351                         SEND_LOCK_DESTROY();
  352                         break;
  353                 }
  354                 send_sendso_input_hook = send_input;
  355                 break;
  356         case MOD_UNLOAD:
  357                 /* Do not allow unloading w/o locking. */
  358                 return (EBUSY);
  359 #ifdef __notyet__
  360                 VNET_LIST_RLOCK_NOSLEEP();
  361                 SEND_LOCK();
  362                 VNET_FOREACH(vnet_iter) {
  363                         CURVNET_SET(vnet_iter);
  364                         if (V_send_so != NULL) {
  365                                 CURVNET_RESTORE();
  366                                 SEND_UNLOCK();
  367                                 VNET_LIST_RUNLOCK_NOSLEEP();
  368                                 return (EBUSY);
  369                         }
  370                         CURVNET_RESTORE();
  371                 }
  372                 SEND_UNLOCK();
  373                 VNET_LIST_RUNLOCK_NOSLEEP();
  374                 error = pf_proto_unregister(PF_INET6, IPPROTO_SEND, SOCK_RAW);
  375                 if (error == 0)
  376                         SEND_LOCK_DESTROY();
  377                 send_sendso_input_hook = NULL;
  378                 break;
  379 #endif
  380         default:
  381                 error = 0;
  382                 break;
  383         }
  384 
  385         return (error);
  386 }
  387 
  388 static moduledata_t sendmod = {
  389         "send",
  390         send_modevent,
  391         0
  392 };
  393 
  394 DECLARE_MODULE(send, sendmod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/send.c

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