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/netipsec/keysock.c

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    1 /*      $FreeBSD: stable/11/sys/netipsec/keysock.c 331722 2018-03-29 02:50:57Z eadler $ */
    2 /*      $KAME: keysock.c,v 1.25 2001/08/13 20:07:41 itojun Exp $        */
    3 
    4 /*-
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include "opt_ipsec.h"
   34 
   35 /* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
   36 
   37 #include <sys/types.h>
   38 #include <sys/param.h>
   39 #include <sys/domain.h>
   40 #include <sys/errno.h>
   41 #include <sys/kernel.h>
   42 #include <sys/lock.h>
   43 #include <sys/malloc.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/mutex.h>
   46 #include <sys/priv.h>
   47 #include <sys/protosw.h>
   48 #include <sys/signalvar.h>
   49 #include <sys/socket.h>
   50 #include <sys/socketvar.h>
   51 #include <sys/sysctl.h>
   52 #include <sys/systm.h>
   53 
   54 #include <net/if.h>
   55 #include <net/vnet.h>
   56 #include <net/raw_cb.h>
   57 
   58 #include <netinet/in.h>
   59 
   60 #include <net/pfkeyv2.h>
   61 #include <netipsec/key.h>
   62 #include <netipsec/keysock.h>
   63 #include <netipsec/key_debug.h>
   64 #include <netipsec/ipsec.h>
   65 
   66 #include <machine/stdarg.h>
   67 
   68 struct key_cb {
   69         int key_count;
   70         int any_count;
   71 };
   72 static VNET_DEFINE(struct key_cb, key_cb);
   73 #define V_key_cb                VNET(key_cb)
   74 
   75 static struct sockaddr key_src = { 2, PF_KEY, };
   76 
   77 static int key_sendup0(struct rawcb *, struct mbuf *, int);
   78 
   79 VNET_PCPUSTAT_DEFINE(struct pfkeystat, pfkeystat);
   80 VNET_PCPUSTAT_SYSINIT(pfkeystat);
   81 
   82 #ifdef VIMAGE
   83 VNET_PCPUSTAT_SYSUNINIT(pfkeystat);
   84 #endif /* VIMAGE */
   85 
   86 /*
   87  * key_output()
   88  */
   89 int
   90 key_output(struct mbuf *m, struct socket *so, ...)
   91 {
   92         struct sadb_msg *msg;
   93         int len, error = 0;
   94 
   95         if (m == NULL)
   96                 panic("%s: NULL pointer was passed.\n", __func__);
   97 
   98         PFKEYSTAT_INC(out_total);
   99         PFKEYSTAT_ADD(out_bytes, m->m_pkthdr.len);
  100 
  101         len = m->m_pkthdr.len;
  102         if (len < sizeof(struct sadb_msg)) {
  103                 PFKEYSTAT_INC(out_tooshort);
  104                 error = EINVAL;
  105                 goto end;
  106         }
  107 
  108         if (m->m_len < sizeof(struct sadb_msg)) {
  109                 if ((m = m_pullup(m, sizeof(struct sadb_msg))) == NULL) {
  110                         PFKEYSTAT_INC(out_nomem);
  111                         error = ENOBUFS;
  112                         goto end;
  113                 }
  114         }
  115 
  116         M_ASSERTPKTHDR(m);
  117 
  118         KEYDBG(KEY_DUMP, kdebug_mbuf(m));
  119 
  120         msg = mtod(m, struct sadb_msg *);
  121         PFKEYSTAT_INC(out_msgtype[msg->sadb_msg_type]);
  122         if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
  123                 PFKEYSTAT_INC(out_invlen);
  124                 error = EINVAL;
  125                 goto end;
  126         }
  127 
  128         error = key_parse(m, so);
  129         m = NULL;
  130 end:
  131         if (m)
  132                 m_freem(m);
  133         return error;
  134 }
  135 
  136 /*
  137  * send message to the socket.
  138  */
  139 static int
  140 key_sendup0(struct rawcb *rp, struct mbuf *m, int promisc)
  141 {
  142         int error;
  143 
  144         if (promisc) {
  145                 struct sadb_msg *pmsg;
  146 
  147                 M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT);
  148                 if (m == NULL) {
  149                         PFKEYSTAT_INC(in_nomem);
  150                         return (ENOBUFS);
  151                 }
  152                 pmsg = mtod(m, struct sadb_msg *);
  153                 bzero(pmsg, sizeof(*pmsg));
  154                 pmsg->sadb_msg_version = PF_KEY_V2;
  155                 pmsg->sadb_msg_type = SADB_X_PROMISC;
  156                 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
  157                 /* pid and seq? */
  158 
  159                 PFKEYSTAT_INC(in_msgtype[pmsg->sadb_msg_type]);
  160         }
  161 
  162         if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
  163             m, NULL)) {
  164                 PFKEYSTAT_INC(in_nomem);
  165                 m_freem(m);
  166                 error = ENOBUFS;
  167         } else
  168                 error = 0;
  169         sorwakeup(rp->rcb_socket);
  170         return error;
  171 }
  172 
  173 /* so can be NULL if target != KEY_SENDUP_ONE */
  174 int
  175 key_sendup_mbuf(struct socket *so, struct mbuf *m, int target)
  176 {
  177         struct mbuf *n;
  178         struct keycb *kp;
  179         struct rawcb *rp;
  180         int error = 0;
  181 
  182         KASSERT(m != NULL, ("NULL mbuf pointer was passed."));
  183         KASSERT(so != NULL || target != KEY_SENDUP_ONE,
  184             ("NULL socket pointer was passed."));
  185         KASSERT(target == KEY_SENDUP_ONE || target == KEY_SENDUP_ALL ||
  186             target == KEY_SENDUP_REGISTERED, ("Wrong target %d", target));
  187 
  188         PFKEYSTAT_INC(in_total);
  189         PFKEYSTAT_ADD(in_bytes, m->m_pkthdr.len);
  190         if (m->m_len < sizeof(struct sadb_msg)) {
  191                 m = m_pullup(m, sizeof(struct sadb_msg));
  192                 if (m == NULL) {
  193                         PFKEYSTAT_INC(in_nomem);
  194                         return ENOBUFS;
  195                 }
  196         }
  197         if (m->m_len >= sizeof(struct sadb_msg)) {
  198                 struct sadb_msg *msg;
  199                 msg = mtod(m, struct sadb_msg *);
  200                 PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
  201         }
  202         mtx_lock(&rawcb_mtx);
  203         if (V_key_cb.any_count == 0) {
  204                 mtx_unlock(&rawcb_mtx);
  205                 m_freem(m);
  206                 return (0);
  207         }
  208         LIST_FOREACH(rp, &V_rawcb_list, list)
  209         {
  210                 if (rp->rcb_proto.sp_family != PF_KEY)
  211                         continue;
  212                 if (rp->rcb_proto.sp_protocol
  213                  && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
  214                         continue;
  215                 }
  216 
  217                 /*
  218                  * If you are in promiscuous mode, and when you get broadcasted
  219                  * reply, you'll get two PF_KEY messages.
  220                  * (based on pf_key@inner.net message on 14 Oct 1998)
  221                  */
  222                 kp = (struct keycb *)rp;
  223                 if (kp->kp_promisc) {
  224                         n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
  225                         if (n != NULL)
  226                                 key_sendup0(rp, n, 1);
  227                         else
  228                                 PFKEYSTAT_INC(in_nomem);
  229                 }
  230 
  231                 /* the exact target will be processed later */
  232                 if (so && sotorawcb(so) == rp)
  233                         continue;
  234 
  235                 if (target == KEY_SENDUP_ONE || (
  236                     target == KEY_SENDUP_REGISTERED && kp->kp_registered == 0))
  237                         continue;
  238 
  239                 /* KEY_SENDUP_ALL + KEY_SENDUP_REGISTERED */
  240                 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
  241                 if (n == NULL) {
  242                         PFKEYSTAT_INC(in_nomem);
  243                         /* Try send to another socket */
  244                         continue;
  245                 }
  246 
  247                 if (key_sendup0(rp, n, 0) == 0)
  248                         PFKEYSTAT_INC(in_msgtarget[target]);
  249         }
  250 
  251         if (so) { /* KEY_SENDUP_ONE */
  252                 error = key_sendup0(sotorawcb(so), m, 0);
  253                 if (error == 0)
  254                         PFKEYSTAT_INC(in_msgtarget[KEY_SENDUP_ONE]);
  255         } else {
  256                 error = 0;
  257                 m_freem(m);
  258         }
  259         mtx_unlock(&rawcb_mtx);
  260         return (error);
  261 }
  262 
  263 /*
  264  * key_abort()
  265  * derived from net/rtsock.c:rts_abort()
  266  */
  267 static void
  268 key_abort(struct socket *so)
  269 {
  270         raw_usrreqs.pru_abort(so);
  271 }
  272 
  273 /*
  274  * key_attach()
  275  * derived from net/rtsock.c:rts_attach()
  276  */
  277 static int
  278 key_attach(struct socket *so, int proto, struct thread *td)
  279 {
  280         struct keycb *kp;
  281         int error;
  282 
  283         KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL"));
  284 
  285         if (td != NULL) {
  286                 error = priv_check(td, PRIV_NET_RAW);
  287                 if (error)
  288                         return error;
  289         }
  290 
  291         /* XXX */
  292         kp = malloc(sizeof *kp, M_PCB, M_WAITOK | M_ZERO); 
  293         if (kp == NULL)
  294                 return ENOBUFS;
  295 
  296         so->so_pcb = (caddr_t)kp;
  297         error = raw_attach(so, proto);
  298         kp = (struct keycb *)sotorawcb(so);
  299         if (error) {
  300                 free(kp, M_PCB);
  301                 so->so_pcb = (caddr_t) 0;
  302                 return error;
  303         }
  304 
  305         kp->kp_promisc = kp->kp_registered = 0;
  306 
  307         if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
  308                 V_key_cb.key_count++;
  309         V_key_cb.any_count++;
  310         soisconnected(so);
  311         so->so_options |= SO_USELOOPBACK;
  312 
  313         return 0;
  314 }
  315 
  316 /*
  317  * key_bind()
  318  * derived from net/rtsock.c:rts_bind()
  319  */
  320 static int
  321 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  322 {
  323   return EINVAL;
  324 }
  325 
  326 /*
  327  * key_close()
  328  * derived from net/rtsock.c:rts_close().
  329  */
  330 static void
  331 key_close(struct socket *so)
  332 {
  333 
  334         raw_usrreqs.pru_close(so);
  335 }
  336 
  337 /*
  338  * key_connect()
  339  * derived from net/rtsock.c:rts_connect()
  340  */
  341 static int
  342 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  343 {
  344         return EINVAL;
  345 }
  346 
  347 /*
  348  * key_detach()
  349  * derived from net/rtsock.c:rts_detach()
  350  */
  351 static void
  352 key_detach(struct socket *so)
  353 {
  354         struct keycb *kp = (struct keycb *)sotorawcb(so);
  355 
  356         KASSERT(kp != NULL, ("key_detach: kp == NULL"));
  357         if (kp->kp_raw.rcb_proto.sp_protocol
  358             == PF_KEY) /* XXX: AF_KEY */
  359                 V_key_cb.key_count--;
  360         V_key_cb.any_count--;
  361 
  362         key_freereg(so);
  363         raw_usrreqs.pru_detach(so);
  364 }
  365 
  366 /*
  367  * key_disconnect()
  368  * derived from net/rtsock.c:key_disconnect()
  369  */
  370 static int
  371 key_disconnect(struct socket *so)
  372 {
  373         return(raw_usrreqs.pru_disconnect(so));
  374 }
  375 
  376 /*
  377  * key_peeraddr()
  378  * derived from net/rtsock.c:rts_peeraddr()
  379  */
  380 static int
  381 key_peeraddr(struct socket *so, struct sockaddr **nam)
  382 {
  383         return(raw_usrreqs.pru_peeraddr(so, nam));
  384 }
  385 
  386 /*
  387  * key_send()
  388  * derived from net/rtsock.c:rts_send()
  389  */
  390 static int
  391 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  392          struct mbuf *control, struct thread *td)
  393 {
  394         return(raw_usrreqs.pru_send(so, flags, m, nam, control, td));
  395 }
  396 
  397 /*
  398  * key_shutdown()
  399  * derived from net/rtsock.c:rts_shutdown()
  400  */
  401 static int
  402 key_shutdown(struct socket *so)
  403 {
  404         return(raw_usrreqs.pru_shutdown(so));
  405 }
  406 
  407 /*
  408  * key_sockaddr()
  409  * derived from net/rtsock.c:rts_sockaddr()
  410  */
  411 static int
  412 key_sockaddr(struct socket *so, struct sockaddr **nam)
  413 {
  414         return(raw_usrreqs.pru_sockaddr(so, nam));
  415 }
  416 
  417 struct pr_usrreqs key_usrreqs = {
  418         .pru_abort =            key_abort,
  419         .pru_attach =           key_attach,
  420         .pru_bind =             key_bind,
  421         .pru_connect =          key_connect,
  422         .pru_detach =           key_detach,
  423         .pru_disconnect =       key_disconnect,
  424         .pru_peeraddr =         key_peeraddr,
  425         .pru_send =             key_send,
  426         .pru_shutdown =         key_shutdown,
  427         .pru_sockaddr =         key_sockaddr,
  428         .pru_close =            key_close,
  429 };
  430 
  431 /* sysctl */
  432 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
  433 
  434 /*
  435  * Definitions of protocols supported in the KEY domain.
  436  */
  437 
  438 extern struct domain keydomain;
  439 
  440 struct protosw keysw[] = {
  441 {
  442         .pr_type =              SOCK_RAW,
  443         .pr_domain =            &keydomain,
  444         .pr_protocol =          PF_KEY_V2,
  445         .pr_flags =             PR_ATOMIC|PR_ADDR,
  446         .pr_output =            key_output,
  447         .pr_ctlinput =          raw_ctlinput,
  448         .pr_init =              raw_init,
  449         .pr_usrreqs =           &key_usrreqs
  450 }
  451 };
  452 
  453 static void
  454 key_init0(void)
  455 {
  456 
  457         bzero((caddr_t)&V_key_cb, sizeof(V_key_cb));
  458         key_init();
  459 }
  460 
  461 struct domain keydomain = {
  462         .dom_family =           PF_KEY,
  463         .dom_name =             "key",
  464         .dom_init =             key_init0,
  465 #ifdef VIMAGE
  466         .dom_destroy =          key_destroy,
  467 #endif
  468         .dom_protosw =          keysw,
  469         .dom_protoswNPROTOSW =  &keysw[nitems(keysw)]
  470 };
  471 
  472 VNET_DOMAIN_SET(key);

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