The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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: releng/12.0/sys/netinet6/send.c 336676 2018-07-24 16:35:52Z andrew $");
   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         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                         m_freem(m);
  169                         return (ENOSYS);
  170                 }
  171                 return (0);
  172 
  173         case SND_OUT:
  174                 if (m->m_len < sizeof(struct ip6_hdr)) {
  175                         m = m_pullup(m, sizeof(struct ip6_hdr));
  176                         if (!m)
  177                                 return (ENOBUFS);
  178                 }
  179                 ip6 = mtod(m, struct ip6_hdr *);
  180                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
  181                         m->m_flags |= M_MCAST;
  182 
  183                 bzero(&dst, sizeof(dst));
  184                 dst.sin6_family = AF_INET6;
  185                 dst.sin6_len = sizeof(dst);
  186                 dst.sin6_addr = ip6->ip6_dst;
  187 
  188                 m_clrprotoflags(m);     /* Avoid confusing lower layers. */
  189 
  190                 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
  191 
  192                 /*
  193                  * Output the packet as nd6.c:nd6_output_lle() would do.
  194                  * The mbuf is always consumed, so we do not have to care
  195                  * about that.
  196                  * XXX-BZ as we added data, what about fragmenting,
  197                  * if now needed?
  198                  */
  199                 int error;
  200                 error = ((*ifp->if_output)(ifp, m, (struct sockaddr *)&dst,
  201                     NULL));
  202                 if (error)
  203                         error = ENOENT;
  204                 return (error);
  205 
  206         default:
  207                 panic("%s: direction %d neither SND_IN nor SND_OUT.",
  208                      __func__, direction);
  209         }
  210 }
  211 
  212 /*
  213  * Receive a SeND message from user space to be either send out by the kernel
  214  * or, with SeND ICMPv6 options removed, to be further processed by the icmp6
  215  * input path.
  216  */
  217 static int
  218 send_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  219     struct mbuf *control, struct thread *td)
  220 {
  221         struct sockaddr_send *sendsrc;
  222         struct ifnet *ifp;
  223         int error;
  224 
  225         KASSERT(V_send_so == so, ("%s: socket %p not send socket %p",
  226                 __func__, so, V_send_so));
  227 
  228         sendsrc = (struct sockaddr_send *)nam;
  229         ifp = ifnet_byindex_ref(sendsrc->send_ifidx);
  230         if (ifp == NULL) {
  231                 error = ENETUNREACH;
  232                 goto err;
  233         }
  234 
  235         error = send_output(m, ifp, sendsrc->send_direction);
  236         if_rele(ifp);
  237         m = NULL;
  238 
  239 err:
  240         if (m != NULL)
  241                 m_freem(m);
  242         return (error);
  243 }
  244 
  245 static void
  246 send_close(struct socket *so)
  247 {
  248 
  249         SEND_LOCK();
  250         if (V_send_so)
  251                 V_send_so = NULL;
  252         SEND_UNLOCK();
  253 }
  254 
  255 /*
  256  * Send a SeND message to user space, that was either received and has to be
  257  * validated or was about to be send out and has to be handled by the SEND
  258  * daemon adding SeND ICMPv6 options.
  259  */
  260 static int
  261 send_input(struct mbuf *m, struct ifnet *ifp, int direction, int msglen __unused)
  262 {
  263         struct ip6_hdr *ip6;
  264         struct sockaddr_send sendsrc;
  265 
  266         SEND_LOCK();
  267         if (V_send_so == NULL) {
  268                 SEND_UNLOCK();
  269                 return (-1);
  270         }
  271 
  272         /*
  273          * Make sure to clear any possible internally embedded scope before
  274          * passing the packet to user space for SeND cryptographic signature
  275          * validation to succeed.
  276          */
  277         ip6 = mtod(m, struct ip6_hdr *);
  278         in6_clearscope(&ip6->ip6_src);
  279         in6_clearscope(&ip6->ip6_dst);
  280 
  281         bzero(&sendsrc, sizeof(sendsrc));
  282         sendsrc.send_len = sizeof(sendsrc);
  283         sendsrc.send_family = AF_INET6;
  284         sendsrc.send_direction = direction;
  285         sendsrc.send_ifidx = ifp->if_index;
  286 
  287         /*
  288          * Send incoming or outgoing traffic to user space either to be
  289          * protected (outgoing) or validated (incoming) according to rfc3971.
  290          */
  291         SOCKBUF_LOCK(&V_send_so->so_rcv);
  292         if (sbappendaddr_locked(&V_send_so->so_rcv,
  293             (struct sockaddr *)&sendsrc, m, NULL) == 0) {
  294                 SOCKBUF_UNLOCK(&V_send_so->so_rcv);
  295                 /* XXX stats. */
  296                 m_freem(m);
  297         } else {
  298                 sorwakeup_locked(V_send_so);
  299         }
  300 
  301         SEND_UNLOCK();
  302         return (0);
  303 }
  304 
  305 struct pr_usrreqs send_usrreqs = {
  306         .pru_attach =           send_attach,
  307         .pru_send =             send_send,
  308         .pru_detach =           send_close
  309 };
  310 struct protosw send_protosw = {
  311         .pr_type =              SOCK_RAW,
  312         .pr_flags =             PR_ATOMIC|PR_ADDR,
  313         .pr_protocol =          IPPROTO_SEND,
  314         .pr_usrreqs =           &send_usrreqs
  315 };
  316 
  317 static int
  318 send_modevent(module_t mod, int type, void *unused)
  319 {
  320 #ifdef __notyet__
  321         VNET_ITERATOR_DECL(vnet_iter);
  322 #endif
  323         int error;
  324 
  325         switch (type) {
  326         case MOD_LOAD:
  327                 SEND_LOCK_INIT();
  328 
  329                 error = pf_proto_register(PF_INET6, &send_protosw);
  330                 if (error != 0) {
  331                         printf("%s:%d: MOD_LOAD pf_proto_register(): %d\n",
  332                            __func__, __LINE__, error);
  333                         SEND_LOCK_DESTROY();
  334                         break;
  335                 }
  336                 send_sendso_input_hook = send_input;
  337                 break;
  338         case MOD_UNLOAD:
  339                 /* Do not allow unloading w/o locking. */
  340                 return (EBUSY);
  341 #ifdef __notyet__
  342                 VNET_LIST_RLOCK_NOSLEEP();
  343                 SEND_LOCK();
  344                 VNET_FOREACH(vnet_iter) {
  345                         CURVNET_SET(vnet_iter);
  346                         if (V_send_so != NULL) {
  347                                 CURVNET_RESTORE();
  348                                 SEND_UNLOCK();
  349                                 VNET_LIST_RUNLOCK_NOSLEEP();
  350                                 return (EBUSY);
  351                         }
  352                         CURVNET_RESTORE();
  353                 }
  354                 SEND_UNLOCK();
  355                 VNET_LIST_RUNLOCK_NOSLEEP();
  356                 error = pf_proto_unregister(PF_INET6, IPPROTO_SEND, SOCK_RAW);
  357                 if (error == 0)
  358                         SEND_LOCK_DESTROY();
  359                 send_sendso_input_hook = NULL;
  360                 break;
  361 #endif
  362         default:
  363                 error = 0;
  364                 break;
  365         }
  366 
  367         return (error);
  368 }
  369 
  370 static moduledata_t sendmod = {
  371         "send",
  372         send_modevent,
  373         0
  374 };
  375 
  376 DECLARE_MODULE(send, sendmod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);

Cache object: eaa84410135fafb67ff84536234c3cb4


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.