The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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/9.2/sys/netinet6/send.c 249132 2013-04-05 08:22:11Z mav $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/mbuf.h>
   33 #include <sys/module.h>
   34 #include <sys/priv.h>
   35 #include <sys/protosw.h>
   36 #include <sys/systm.h>
   37 #include <sys/socket.h>
   38 #include <sys/sockstate.h>
   39 #include <sys/sockbuf.h>
   40 #include <sys/socketvar.h>
   41 #include <sys/types.h>
   42 
   43 #include <net/route.h>
   44 #include <net/if.h>
   45 #include <net/if_var.h>
   46 #include <net/vnet.h>
   47 
   48 #include <netinet/in.h>
   49 #include <netinet/ip_var.h>
   50 #include <netinet/ip6.h>
   51 #include <netinet/icmp6.h>
   52 
   53 #include <netinet6/in6_var.h>
   54 #include <netinet6/nd6.h>
   55 #include <netinet6/scope6_var.h>
   56 #include <netinet6/send.h>
   57 
   58 static MALLOC_DEFINE(M_SEND, "send", "Secure Neighbour Discovery");
   59 
   60 /*
   61  * The socket used to communicate with the SeND daemon.
   62  */
   63 static VNET_DEFINE(struct socket *, send_so);
   64 #define V_send_so       VNET(send_so)
   65 
   66 u_long  send_sendspace  = 8 * (1024 + sizeof(struct sockaddr_send));
   67 u_long  send_recvspace  = 9216;
   68 
   69 struct mtx      send_mtx;
   70 #define SEND_LOCK_INIT()        mtx_init(&send_mtx, "send_mtx", NULL, MTX_DEF)
   71 #define SEND_LOCK()             mtx_lock(&send_mtx)
   72 #define SEND_UNLOCK()           mtx_unlock(&send_mtx)
   73 #define SEND_LOCK_DESTROY()     mtx_destroy(&send_mtx)
   74 
   75 static int
   76 send_attach(struct socket *so, int proto, struct thread *td)
   77 {
   78         int error;
   79 
   80         SEND_LOCK();
   81         if (V_send_so != NULL) {
   82                 SEND_UNLOCK();
   83                 return (EEXIST);
   84         }
   85 
   86         error = priv_check(td, PRIV_NETINET_RAW);
   87         if (error) {
   88                 SEND_UNLOCK();
   89                 return(error);
   90         }
   91 
   92         if (proto != IPPROTO_SEND) {
   93                 SEND_UNLOCK();
   94                 return (EPROTONOSUPPORT);
   95         }
   96         error = soreserve(so, send_sendspace, send_recvspace);
   97         if (error) {
   98                 SEND_UNLOCK();
   99                 return(error);
  100         }
  101 
  102         V_send_so = so;
  103         SEND_UNLOCK();
  104 
  105         return (0);
  106 }
  107 
  108 static int
  109 send_output(struct mbuf *m, struct ifnet *ifp, int direction)
  110 {
  111         struct ip6_hdr *ip6;
  112         struct sockaddr_in6 dst;
  113         struct icmp6_hdr *icmp6;
  114         int icmp6len;
  115 
  116         /*
  117          * Receive incoming (SeND-protected) or outgoing traffic
  118          * (SeND-validated) from the SeND user space application.
  119          */
  120 
  121         switch (direction) {
  122         case SND_IN:
  123                 if (m->m_len < (sizeof(struct ip6_hdr) +
  124                     sizeof(struct icmp6_hdr))) {
  125                         m = m_pullup(m, sizeof(struct ip6_hdr) +
  126                             sizeof(struct icmp6_hdr));
  127                         if (!m)
  128                                 return (ENOBUFS);
  129                 }
  130 
  131                 /* Before passing off the mbuf record the proper interface. */
  132                 m->m_pkthdr.rcvif = ifp;
  133 
  134                 if (m->m_flags & M_PKTHDR)
  135                         icmp6len = m->m_pkthdr.len - sizeof(struct ip6_hdr);
  136                 else
  137                         panic("Doh! not the first mbuf.");
  138 
  139                 ip6 = mtod(m, struct ip6_hdr *);
  140                 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
  141 
  142                 /*
  143                  * Output the packet as icmp6.c:icpm6_input() would do.
  144                  * The mbuf is always consumed, so we do not have to
  145                  * care about that.
  146                  */
  147                 switch (icmp6->icmp6_type) {
  148                 case ND_NEIGHBOR_SOLICIT:
  149                         nd6_ns_input(m, sizeof(struct ip6_hdr), icmp6len);
  150                         break;
  151                 case ND_NEIGHBOR_ADVERT:
  152                         nd6_na_input(m, sizeof(struct ip6_hdr), icmp6len);
  153                         break;
  154                 case ND_REDIRECT:
  155                         icmp6_redirect_input(m, sizeof(struct ip6_hdr));
  156                         break;
  157                 case ND_ROUTER_SOLICIT:
  158                         nd6_rs_input(m, sizeof(struct ip6_hdr), icmp6len);
  159                         break;
  160                 case ND_ROUTER_ADVERT:
  161                         nd6_ra_input(m, sizeof(struct ip6_hdr), icmp6len);
  162                         break;
  163                 default:
  164                         return (ENOSYS);
  165                 }
  166                 return (0);
  167 
  168         case SND_OUT:
  169                 if (m->m_len < sizeof(struct ip6_hdr)) {
  170                         m = m_pullup(m, sizeof(struct ip6_hdr));
  171                         if (!m)
  172                                 return (ENOBUFS);
  173                 }
  174                 ip6 = mtod(m, struct ip6_hdr *);
  175                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
  176                         m->m_flags |= M_MCAST;
  177 
  178                 bzero(&dst, sizeof(dst));
  179                 dst.sin6_family = AF_INET6;
  180                 dst.sin6_len = sizeof(dst);
  181                 dst.sin6_addr = ip6->ip6_dst;
  182 
  183                 /*
  184                  * Output the packet as nd6.c:nd6_output_lle() would do.
  185                  * The mbuf is always consumed, so we do not have to care
  186                  * about that.
  187                  * XXX-BZ as we added data, what about fragmenting,
  188                  * if now needed?
  189                  */
  190                 int error;
  191                 error = ((*ifp->if_output)(ifp, m, (struct sockaddr *)&dst,
  192                     NULL));
  193                 if (error)
  194                         error = ENOENT;
  195                 return (error);
  196 
  197         default:
  198                 panic("%s: direction %d neither SND_IN nor SND_OUT.",
  199                      __func__, direction);
  200         }
  201 }
  202 
  203 /*
  204  * Receive a SeND message from user space to be either send out by the kernel
  205  * or, with SeND ICMPv6 options removed, to be further processed by the icmp6
  206  * input path.
  207  */
  208 static int
  209 send_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  210     struct mbuf *control, struct thread *td)
  211 {
  212         struct sockaddr_send *sendsrc;
  213         struct ifnet *ifp;
  214         int error;
  215 
  216         KASSERT(V_send_so == so, ("%s: socket %p not send socket %p",
  217                 __func__, so, V_send_so));
  218 
  219         sendsrc = (struct sockaddr_send *)nam;
  220         ifp = ifnet_byindex_ref(sendsrc->send_ifidx);
  221         if (ifp == NULL) {
  222                 error = ENETUNREACH;
  223                 goto err;
  224         }
  225 
  226         error = send_output(m, ifp, sendsrc->send_direction);
  227         if_rele(ifp);
  228         m = NULL;
  229 
  230 err:
  231         if (m != NULL)
  232                 m_freem(m);
  233         return (error);
  234 }
  235 
  236 static void
  237 send_close(struct socket *so)
  238 {
  239 
  240         SEND_LOCK();
  241         if (V_send_so)
  242                 V_send_so = NULL;
  243         SEND_UNLOCK();
  244 }
  245 
  246 /*
  247  * Send a SeND message to user space, that was either received and has to be
  248  * validated or was about to be send out and has to be handled by the SEND
  249  * daemon adding SeND ICMPv6 options.
  250  */
  251 static int
  252 send_input(struct mbuf *m, struct ifnet *ifp, int direction, int msglen __unused)
  253 {
  254         struct ip6_hdr *ip6;
  255         struct sockaddr_send sendsrc;
  256 
  257         SEND_LOCK();
  258         if (V_send_so == NULL) {
  259                 SEND_UNLOCK();
  260                 return (-1);
  261         }
  262 
  263         /*
  264          * Make sure to clear any possible internally embedded scope before
  265          * passing the packet to user space for SeND cryptographic signature
  266          * validation to succeed.
  267          */
  268         ip6 = mtod(m, struct ip6_hdr *);
  269         in6_clearscope(&ip6->ip6_src);
  270         in6_clearscope(&ip6->ip6_dst);
  271 
  272         bzero(&sendsrc, sizeof(sendsrc));
  273         sendsrc.send_len = sizeof(sendsrc);
  274         sendsrc.send_family = AF_INET6;
  275         sendsrc.send_direction = direction;
  276         sendsrc.send_ifidx = ifp->if_index;
  277 
  278         /*
  279          * Send incoming or outgoing traffic to user space either to be
  280          * protected (outgoing) or validated (incoming) according to rfc3971.
  281          */
  282         SOCKBUF_LOCK(&V_send_so->so_rcv);
  283         if (sbappendaddr_locked(&V_send_so->so_rcv,
  284             (struct sockaddr *)&sendsrc, m, NULL) == 0) {
  285                 SOCKBUF_UNLOCK(&V_send_so->so_rcv);
  286                 /* XXX stats. */
  287                 m_freem(m);
  288         } else {
  289                 sorwakeup_locked(V_send_so);
  290         }
  291 
  292         SEND_UNLOCK();
  293         return (0);
  294 }
  295 
  296 struct pr_usrreqs send_usrreqs = {
  297         .pru_attach =           send_attach,
  298         .pru_send =             send_send,
  299         .pru_detach =           send_close
  300 };
  301 struct protosw send_protosw = {
  302         .pr_type =              SOCK_RAW,
  303         .pr_flags =             PR_ATOMIC|PR_ADDR,
  304         .pr_protocol =          IPPROTO_SEND,
  305         .pr_usrreqs =           &send_usrreqs
  306 };
  307 
  308 static int
  309 send_modevent(module_t mod, int type, void *unused)
  310 {
  311 #ifdef __notyet__
  312         VNET_ITERATOR_DECL(vnet_iter);
  313 #endif
  314         int error;
  315 
  316         switch (type) {
  317         case MOD_LOAD:
  318                 SEND_LOCK_INIT();
  319 
  320                 error = pf_proto_register(PF_INET6, &send_protosw);
  321                 if (error != 0) {
  322                         printf("%s:%d: MOD_LOAD pf_proto_register(): %d\n",
  323                            __func__, __LINE__, error);
  324                         SEND_LOCK_DESTROY();
  325                         break;
  326                 }
  327                 send_sendso_input_hook = send_input;
  328                 break;
  329         case MOD_UNLOAD:
  330                 /* Do not allow unloading w/o locking. */
  331                 return (EBUSY);
  332 #ifdef __notyet__
  333                 VNET_LIST_RLOCK_NOSLEEP();
  334                 SEND_LOCK();
  335                 VNET_FOREACH(vnet_iter) {
  336                         CURVNET_SET(vnet_iter);
  337                         if (V_send_so != NULL) {
  338                                 CURVNET_RESTORE();
  339                                 SEND_UNLOCK();
  340                                 VNET_LIST_RUNLOCK_NOSLEEP();
  341                                 return (EBUSY);
  342                         }
  343                         CURVNET_RESTORE();
  344                 }
  345                 SEND_UNLOCK();
  346                 VNET_LIST_RUNLOCK_NOSLEEP();
  347                 error = pf_proto_unregister(PF_INET6, IPPROTO_SEND, SOCK_RAW);
  348                 if (error == 0)
  349                         SEND_LOCK_DESTROY();
  350                 send_sendso_input_hook = NULL;
  351                 break;
  352 #endif
  353         default:
  354                 error = 0;
  355                 break;
  356         }
  357 
  358         return (error);
  359 }
  360 
  361 static moduledata_t sendmod = {
  362         "send",
  363         send_modevent,
  364         0
  365 };
  366 
  367 DECLARE_MODULE(send, sendmod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);

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