The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/send.c

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    1 /*-
    2  * Copyright (c) 2009-2010 Ana Kukec <anchie@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  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/10.4/sys/netinet6/send.c 254889 2013-08-25 21:54:41Z markj $");
   29 
   30 #include "opt_kdtrace.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/mbuf.h>
   35 #include <sys/module.h>
   36 #include <sys/priv.h>
   37 #include <sys/protosw.h>
   38 #include <sys/sdt.h>
   39 #include <sys/systm.h>
   40 #include <sys/socket.h>
   41 #include <sys/sockstate.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 static VNET_DEFINE(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         int icmp6len;
  119 
  120         /*
  121          * Receive incoming (SeND-protected) or outgoing traffic
  122          * (SeND-validated) from the SeND user space application.
  123          */
  124 
  125         switch (direction) {
  126         case SND_IN:
  127                 if (m->m_len < (sizeof(struct ip6_hdr) +
  128                     sizeof(struct icmp6_hdr))) {
  129                         m = m_pullup(m, sizeof(struct ip6_hdr) +
  130                             sizeof(struct icmp6_hdr));
  131                         if (!m)
  132                                 return (ENOBUFS);
  133                 }
  134 
  135                 /* Before passing off the mbuf record the proper interface. */
  136                 m->m_pkthdr.rcvif = ifp;
  137 
  138                 if (m->m_flags & M_PKTHDR)
  139                         icmp6len = m->m_pkthdr.len - sizeof(struct ip6_hdr);
  140                 else
  141                         panic("Doh! not the first mbuf.");
  142 
  143                 ip6 = mtod(m, struct ip6_hdr *);
  144                 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
  145 
  146                 /*
  147                  * Output the packet as icmp6.c:icpm6_input() would do.
  148                  * The mbuf is always consumed, so we do not have to
  149                  * care about that.
  150                  */
  151                 switch (icmp6->icmp6_type) {
  152                 case ND_NEIGHBOR_SOLICIT:
  153                         nd6_ns_input(m, sizeof(struct ip6_hdr), icmp6len);
  154                         break;
  155                 case ND_NEIGHBOR_ADVERT:
  156                         nd6_na_input(m, sizeof(struct ip6_hdr), icmp6len);
  157                         break;
  158                 case ND_REDIRECT:
  159                         icmp6_redirect_input(m, sizeof(struct ip6_hdr));
  160                         break;
  161                 case ND_ROUTER_SOLICIT:
  162                         nd6_rs_input(m, sizeof(struct ip6_hdr), icmp6len);
  163                         break;
  164                 case ND_ROUTER_ADVERT:
  165                         nd6_ra_input(m, sizeof(struct ip6_hdr), icmp6len);
  166                         break;
  167                 default:
  168                         return (ENOSYS);
  169                 }
  170                 return (0);
  171 
  172         case SND_OUT:
  173                 if (m->m_len < sizeof(struct ip6_hdr)) {
  174                         m = m_pullup(m, sizeof(struct ip6_hdr));
  175                         if (!m)
  176                                 return (ENOBUFS);
  177                 }
  178                 ip6 = mtod(m, struct ip6_hdr *);
  179                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
  180                         m->m_flags |= M_MCAST;
  181 
  182                 bzero(&dst, sizeof(dst));
  183                 dst.sin6_family = AF_INET6;
  184                 dst.sin6_len = sizeof(dst);
  185                 dst.sin6_addr = ip6->ip6_dst;
  186 
  187                 m_clrprotoflags(m);     /* Avoid confusing lower layers. */
  188 
  189                 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
  190 
  191                 /*
  192                  * Output the packet as nd6.c:nd6_output_lle() would do.
  193                  * The mbuf is always consumed, so we do not have to care
  194                  * about that.
  195                  * XXX-BZ as we added data, what about fragmenting,
  196                  * if now needed?
  197                  */
  198                 int error;
  199                 error = ((*ifp->if_output)(ifp, m, (struct sockaddr *)&dst,
  200                     NULL));
  201                 if (error)
  202                         error = ENOENT;
  203                 return (error);
  204 
  205         default:
  206                 panic("%s: direction %d neither SND_IN nor SND_OUT.",
  207                      __func__, direction);
  208         }
  209 }
  210 
  211 /*
  212  * Receive a SeND message from user space to be either send out by the kernel
  213  * or, with SeND ICMPv6 options removed, to be further processed by the icmp6
  214  * input path.
  215  */
  216 static int
  217 send_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  218     struct mbuf *control, struct thread *td)
  219 {
  220         struct sockaddr_send *sendsrc;
  221         struct ifnet *ifp;
  222         int error;
  223 
  224         KASSERT(V_send_so == so, ("%s: socket %p not send socket %p",
  225                 __func__, so, V_send_so));
  226 
  227         sendsrc = (struct sockaddr_send *)nam;
  228         ifp = ifnet_byindex_ref(sendsrc->send_ifidx);
  229         if (ifp == NULL) {
  230                 error = ENETUNREACH;
  231                 goto err;
  232         }
  233 
  234         error = send_output(m, ifp, sendsrc->send_direction);
  235         if_rele(ifp);
  236         m = NULL;
  237 
  238 err:
  239         if (m != NULL)
  240                 m_freem(m);
  241         return (error);
  242 }
  243 
  244 static void
  245 send_close(struct socket *so)
  246 {
  247 
  248         SEND_LOCK();
  249         if (V_send_so)
  250                 V_send_so = NULL;
  251         SEND_UNLOCK();
  252 }
  253 
  254 /*
  255  * Send a SeND message to user space, that was either received and has to be
  256  * validated or was about to be send out and has to be handled by the SEND
  257  * daemon adding SeND ICMPv6 options.
  258  */
  259 static int
  260 send_input(struct mbuf *m, struct ifnet *ifp, int direction, int msglen __unused)
  261 {
  262         struct ip6_hdr *ip6;
  263         struct sockaddr_send sendsrc;
  264 
  265         SEND_LOCK();
  266         if (V_send_so == NULL) {
  267                 SEND_UNLOCK();
  268                 return (-1);
  269         }
  270 
  271         /*
  272          * Make sure to clear any possible internally embedded scope before
  273          * passing the packet to user space for SeND cryptographic signature
  274          * validation to succeed.
  275          */
  276         ip6 = mtod(m, struct ip6_hdr *);
  277         in6_clearscope(&ip6->ip6_src);
  278         in6_clearscope(&ip6->ip6_dst);
  279 
  280         bzero(&sendsrc, sizeof(sendsrc));
  281         sendsrc.send_len = sizeof(sendsrc);
  282         sendsrc.send_family = AF_INET6;
  283         sendsrc.send_direction = direction;
  284         sendsrc.send_ifidx = ifp->if_index;
  285 
  286         /*
  287          * Send incoming or outgoing traffic to user space either to be
  288          * protected (outgoing) or validated (incoming) according to rfc3971.
  289          */
  290         SOCKBUF_LOCK(&V_send_so->so_rcv);
  291         if (sbappendaddr_locked(&V_send_so->so_rcv,
  292             (struct sockaddr *)&sendsrc, m, NULL) == 0) {
  293                 SOCKBUF_UNLOCK(&V_send_so->so_rcv);
  294                 /* XXX stats. */
  295                 m_freem(m);
  296         } else {
  297                 sorwakeup_locked(V_send_so);
  298         }
  299 
  300         SEND_UNLOCK();
  301         return (0);
  302 }
  303 
  304 struct pr_usrreqs send_usrreqs = {
  305         .pru_attach =           send_attach,
  306         .pru_send =             send_send,
  307         .pru_detach =           send_close
  308 };
  309 struct protosw send_protosw = {
  310         .pr_type =              SOCK_RAW,
  311         .pr_flags =             PR_ATOMIC|PR_ADDR,
  312         .pr_protocol =          IPPROTO_SEND,
  313         .pr_usrreqs =           &send_usrreqs
  314 };
  315 
  316 static int
  317 send_modevent(module_t mod, int type, void *unused)
  318 {
  319 #ifdef __notyet__
  320         VNET_ITERATOR_DECL(vnet_iter);
  321 #endif
  322         int error;
  323 
  324         switch (type) {
  325         case MOD_LOAD:
  326                 SEND_LOCK_INIT();
  327 
  328                 error = pf_proto_register(PF_INET6, &send_protosw);
  329                 if (error != 0) {
  330                         printf("%s:%d: MOD_LOAD pf_proto_register(): %d\n",
  331                            __func__, __LINE__, error);
  332                         SEND_LOCK_DESTROY();
  333                         break;
  334                 }
  335                 send_sendso_input_hook = send_input;
  336                 break;
  337         case MOD_UNLOAD:
  338                 /* Do not allow unloading w/o locking. */
  339                 return (EBUSY);
  340 #ifdef __notyet__
  341                 VNET_LIST_RLOCK_NOSLEEP();
  342                 SEND_LOCK();
  343                 VNET_FOREACH(vnet_iter) {
  344                         CURVNET_SET(vnet_iter);
  345                         if (V_send_so != NULL) {
  346                                 CURVNET_RESTORE();
  347                                 SEND_UNLOCK();
  348                                 VNET_LIST_RUNLOCK_NOSLEEP();
  349                                 return (EBUSY);
  350                         }
  351                         CURVNET_RESTORE();
  352                 }
  353                 SEND_UNLOCK();
  354                 VNET_LIST_RUNLOCK_NOSLEEP();
  355                 error = pf_proto_unregister(PF_INET6, IPPROTO_SEND, SOCK_RAW);
  356                 if (error == 0)
  357                         SEND_LOCK_DESTROY();
  358                 send_sendso_input_hook = NULL;
  359                 break;
  360 #endif
  361         default:
  362                 error = 0;
  363                 break;
  364         }
  365 
  366         return (error);
  367 }
  368 
  369 static moduledata_t sendmod = {
  370         "send",
  371         send_modevent,
  372         0
  373 };
  374 
  375 DECLARE_MODULE(send, sendmod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);

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