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: releng/10.1/sys/netipsec/keysock.c 253088 2013-07-09 10:08:13Z ae $   */
    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/raw_cb.h>
   56 #include <net/route.h>
   57 #include <net/vnet.h>
   58 
   59 #include <netinet/in.h>
   60 
   61 #include <net/pfkeyv2.h>
   62 #include <netipsec/key.h>
   63 #include <netipsec/keysock.h>
   64 #include <netipsec/key_debug.h>
   65 #include <netipsec/ipsec.h>
   66 
   67 #include <machine/stdarg.h>
   68 
   69 struct key_cb {
   70         int key_count;
   71         int any_count;
   72 };
   73 static VNET_DEFINE(struct key_cb, key_cb);
   74 #define V_key_cb                VNET(key_cb)
   75 
   76 static struct sockaddr key_src = { 2, PF_KEY, };
   77 
   78 static int key_sendup0 __P((struct rawcb *, struct mbuf *, int));
   79 
   80 VNET_PCPUSTAT_DEFINE(struct pfkeystat, pfkeystat);
   81 VNET_PCPUSTAT_SYSINIT(pfkeystat);
   82 
   83 #ifdef VIMAGE
   84 VNET_PCPUSTAT_SYSUNINIT(pfkeystat);
   85 #endif /* VIMAGE */
   86 
   87 /*
   88  * key_output()
   89  */
   90 int
   91 key_output(struct mbuf *m, struct socket *so)
   92 {
   93         struct sadb_msg *msg;
   94         int len, error = 0;
   95 
   96         if (m == 0)
   97                 panic("%s: NULL pointer was passed.\n", __func__);
   98 
   99         PFKEYSTAT_INC(out_total);
  100         PFKEYSTAT_ADD(out_bytes, m->m_pkthdr.len);
  101 
  102         len = m->m_pkthdr.len;
  103         if (len < sizeof(struct sadb_msg)) {
  104                 PFKEYSTAT_INC(out_tooshort);
  105                 error = EINVAL;
  106                 goto end;
  107         }
  108 
  109         if (m->m_len < sizeof(struct sadb_msg)) {
  110                 if ((m = m_pullup(m, sizeof(struct sadb_msg))) == 0) {
  111                         PFKEYSTAT_INC(out_nomem);
  112                         error = ENOBUFS;
  113                         goto end;
  114                 }
  115         }
  116 
  117         M_ASSERTPKTHDR(m);
  118 
  119         KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m));
  120 
  121         msg = mtod(m, struct sadb_msg *);
  122         PFKEYSTAT_INC(out_msgtype[msg->sadb_msg_type]);
  123         if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
  124                 PFKEYSTAT_INC(out_invlen);
  125                 error = EINVAL;
  126                 goto end;
  127         }
  128 
  129         error = key_parse(m, so);
  130         m = NULL;
  131 end:
  132         if (m)
  133                 m_freem(m);
  134         return error;
  135 }
  136 
  137 /*
  138  * send message to the socket.
  139  */
  140 static int
  141 key_sendup0(rp, m, promisc)
  142         struct rawcb *rp;
  143         struct mbuf *m;
  144         int promisc;
  145 {
  146         int error;
  147 
  148         if (promisc) {
  149                 struct sadb_msg *pmsg;
  150 
  151                 M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT);
  152                 if (m && m->m_len < sizeof(struct sadb_msg))
  153                         m = m_pullup(m, sizeof(struct sadb_msg));
  154                 if (!m) {
  155                         PFKEYSTAT_INC(in_nomem);
  156                         m_freem(m);
  157                         return ENOBUFS;
  158                 }
  159                 m->m_pkthdr.len += sizeof(*pmsg);
  160 
  161                 pmsg = mtod(m, struct sadb_msg *);
  162                 bzero(pmsg, sizeof(*pmsg));
  163                 pmsg->sadb_msg_version = PF_KEY_V2;
  164                 pmsg->sadb_msg_type = SADB_X_PROMISC;
  165                 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
  166                 /* pid and seq? */
  167 
  168                 PFKEYSTAT_INC(in_msgtype[pmsg->sadb_msg_type]);
  169         }
  170 
  171         if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
  172             m, NULL)) {
  173                 PFKEYSTAT_INC(in_nomem);
  174                 m_freem(m);
  175                 error = ENOBUFS;
  176         } else
  177                 error = 0;
  178         sorwakeup(rp->rcb_socket);
  179         return error;
  180 }
  181 
  182 /* XXX this interface should be obsoleted. */
  183 int
  184 key_sendup(so, msg, len, target)
  185         struct socket *so;
  186         struct sadb_msg *msg;
  187         u_int len;
  188         int target;     /*target of the resulting message*/
  189 {
  190         struct mbuf *m, *n, *mprev;
  191         int tlen;
  192 
  193         /* sanity check */
  194         if (so == 0 || msg == 0)
  195                 panic("%s: NULL pointer was passed.\n", __func__);
  196 
  197         KEYDEBUG(KEYDEBUG_KEY_DUMP,
  198                 printf("%s: \n", __func__);
  199                 kdebug_sadb(msg));
  200 
  201         /*
  202          * we increment statistics here, just in case we have ENOBUFS
  203          * in this function.
  204          */
  205         PFKEYSTAT_INC(in_total);
  206         PFKEYSTAT_ADD(in_bytes, len);
  207         PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
  208 
  209         /*
  210          * Get mbuf chain whenever possible (not clusters),
  211          * to save socket buffer.  We'll be generating many SADB_ACQUIRE
  212          * messages to listening key sockets.  If we simply allocate clusters,
  213          * sbappendaddr() will raise ENOBUFS due to too little sbspace().
  214          * sbspace() computes # of actual data bytes AND mbuf region.
  215          *
  216          * TODO: SADB_ACQUIRE filters should be implemented.
  217          */
  218         tlen = len;
  219         m = mprev = NULL;
  220         while (tlen > 0) {
  221                 if (tlen == len) {
  222                         MGETHDR(n, M_NOWAIT, MT_DATA);
  223                         if (n == NULL) {
  224                                 PFKEYSTAT_INC(in_nomem);
  225                                 return ENOBUFS;
  226                         }
  227                         n->m_len = MHLEN;
  228                 } else {
  229                         MGET(n, M_NOWAIT, MT_DATA);
  230                         if (n == NULL) {
  231                                 PFKEYSTAT_INC(in_nomem);
  232                                 return ENOBUFS;
  233                         }
  234                         n->m_len = MLEN;
  235                 }
  236                 if (tlen >= MCLBYTES) { /*XXX better threshold? */
  237                         MCLGET(n, M_NOWAIT);
  238                         if ((n->m_flags & M_EXT) == 0) {
  239                                 m_free(n);
  240                                 m_freem(m);
  241                                 PFKEYSTAT_INC(in_nomem);
  242                                 return ENOBUFS;
  243                         }
  244                         n->m_len = MCLBYTES;
  245                 }
  246 
  247                 if (tlen < n->m_len)
  248                         n->m_len = tlen;
  249                 n->m_next = NULL;
  250                 if (m == NULL)
  251                         m = mprev = n;
  252                 else {
  253                         mprev->m_next = n;
  254                         mprev = n;
  255                 }
  256                 tlen -= n->m_len;
  257                 n = NULL;
  258         }
  259         m->m_pkthdr.len = len;
  260         m->m_pkthdr.rcvif = NULL;
  261         m_copyback(m, 0, len, (caddr_t)msg);
  262 
  263         /* avoid duplicated statistics */
  264         PFKEYSTAT_ADD(in_total, -1);
  265         PFKEYSTAT_ADD(in_bytes, -len);
  266         PFKEYSTAT_ADD(in_msgtype[msg->sadb_msg_type], -1);
  267 
  268         return key_sendup_mbuf(so, m, target);
  269 }
  270 
  271 /* so can be NULL if target != KEY_SENDUP_ONE */
  272 int
  273 key_sendup_mbuf(so, m, target)
  274         struct socket *so;
  275         struct mbuf *m;
  276         int target;
  277 {
  278         struct mbuf *n;
  279         struct keycb *kp;
  280         int sendup;
  281         struct rawcb *rp;
  282         int error = 0;
  283 
  284         if (m == NULL)
  285                 panic("key_sendup_mbuf: NULL pointer was passed.\n");
  286         if (so == NULL && target == KEY_SENDUP_ONE)
  287                 panic("%s: NULL pointer was passed.\n", __func__);
  288 
  289         PFKEYSTAT_INC(in_total);
  290         PFKEYSTAT_ADD(in_bytes, m->m_pkthdr.len);
  291         if (m->m_len < sizeof(struct sadb_msg)) {
  292                 m = m_pullup(m, sizeof(struct sadb_msg));
  293                 if (m == NULL) {
  294                         PFKEYSTAT_INC(in_nomem);
  295                         return ENOBUFS;
  296                 }
  297         }
  298         if (m->m_len >= sizeof(struct sadb_msg)) {
  299                 struct sadb_msg *msg;
  300                 msg = mtod(m, struct sadb_msg *);
  301                 PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
  302         }
  303         mtx_lock(&rawcb_mtx);
  304         LIST_FOREACH(rp, &V_rawcb_list, list)
  305         {
  306                 if (rp->rcb_proto.sp_family != PF_KEY)
  307                         continue;
  308                 if (rp->rcb_proto.sp_protocol
  309                  && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
  310                         continue;
  311                 }
  312 
  313                 kp = (struct keycb *)rp;
  314 
  315                 /*
  316                  * If you are in promiscuous mode, and when you get broadcasted
  317                  * reply, you'll get two PF_KEY messages.
  318                  * (based on pf_key@inner.net message on 14 Oct 1998)
  319                  */
  320                 if (((struct keycb *)rp)->kp_promisc) {
  321                         if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
  322                                 (void)key_sendup0(rp, n, 1);
  323                                 n = NULL;
  324                         }
  325                 }
  326 
  327                 /* the exact target will be processed later */
  328                 if (so && sotorawcb(so) == rp)
  329                         continue;
  330 
  331                 sendup = 0;
  332                 switch (target) {
  333                 case KEY_SENDUP_ONE:
  334                         /* the statement has no effect */
  335                         if (so && sotorawcb(so) == rp)
  336                                 sendup++;
  337                         break;
  338                 case KEY_SENDUP_ALL:
  339                         sendup++;
  340                         break;
  341                 case KEY_SENDUP_REGISTERED:
  342                         if (kp->kp_registered)
  343                                 sendup++;
  344                         break;
  345                 }
  346                 PFKEYSTAT_INC(in_msgtarget[target]);
  347 
  348                 if (!sendup)
  349                         continue;
  350 
  351                 if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
  352                         m_freem(m);
  353                         PFKEYSTAT_INC(in_nomem);
  354                         mtx_unlock(&rawcb_mtx);
  355                         return ENOBUFS;
  356                 }
  357 
  358                 if ((error = key_sendup0(rp, n, 0)) != 0) {
  359                         m_freem(m);
  360                         mtx_unlock(&rawcb_mtx);
  361                         return error;
  362                 }
  363 
  364                 n = NULL;
  365         }
  366 
  367         if (so) {
  368                 error = key_sendup0(sotorawcb(so), m, 0);
  369                 m = NULL;
  370         } else {
  371                 error = 0;
  372                 m_freem(m);
  373         }
  374         mtx_unlock(&rawcb_mtx);
  375         return error;
  376 }
  377 
  378 /*
  379  * key_abort()
  380  * derived from net/rtsock.c:rts_abort()
  381  */
  382 static void
  383 key_abort(struct socket *so)
  384 {
  385         raw_usrreqs.pru_abort(so);
  386 }
  387 
  388 /*
  389  * key_attach()
  390  * derived from net/rtsock.c:rts_attach()
  391  */
  392 static int
  393 key_attach(struct socket *so, int proto, struct thread *td)
  394 {
  395         struct keycb *kp;
  396         int error;
  397 
  398         KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL"));
  399 
  400         if (td != NULL) {
  401                 error = priv_check(td, PRIV_NET_RAW);
  402                 if (error)
  403                         return error;
  404         }
  405 
  406         /* XXX */
  407         kp = malloc(sizeof *kp, M_PCB, M_WAITOK | M_ZERO); 
  408         if (kp == 0)
  409                 return ENOBUFS;
  410 
  411         so->so_pcb = (caddr_t)kp;
  412         error = raw_attach(so, proto);
  413         kp = (struct keycb *)sotorawcb(so);
  414         if (error) {
  415                 free(kp, M_PCB);
  416                 so->so_pcb = (caddr_t) 0;
  417                 return error;
  418         }
  419 
  420         kp->kp_promisc = kp->kp_registered = 0;
  421 
  422         if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
  423                 V_key_cb.key_count++;
  424         V_key_cb.any_count++;
  425         soisconnected(so);
  426         so->so_options |= SO_USELOOPBACK;
  427 
  428         return 0;
  429 }
  430 
  431 /*
  432  * key_bind()
  433  * derived from net/rtsock.c:rts_bind()
  434  */
  435 static int
  436 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  437 {
  438   return EINVAL;
  439 }
  440 
  441 /*
  442  * key_close()
  443  * derived from net/rtsock.c:rts_close().
  444  */
  445 static void
  446 key_close(struct socket *so)
  447 {
  448 
  449         raw_usrreqs.pru_close(so);
  450 }
  451 
  452 /*
  453  * key_connect()
  454  * derived from net/rtsock.c:rts_connect()
  455  */
  456 static int
  457 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  458 {
  459         return EINVAL;
  460 }
  461 
  462 /*
  463  * key_detach()
  464  * derived from net/rtsock.c:rts_detach()
  465  */
  466 static void
  467 key_detach(struct socket *so)
  468 {
  469         struct keycb *kp = (struct keycb *)sotorawcb(so);
  470 
  471         KASSERT(kp != NULL, ("key_detach: kp == NULL"));
  472         if (kp->kp_raw.rcb_proto.sp_protocol
  473             == PF_KEY) /* XXX: AF_KEY */
  474                 V_key_cb.key_count--;
  475         V_key_cb.any_count--;
  476 
  477         key_freereg(so);
  478         raw_usrreqs.pru_detach(so);
  479 }
  480 
  481 /*
  482  * key_disconnect()
  483  * derived from net/rtsock.c:key_disconnect()
  484  */
  485 static int
  486 key_disconnect(struct socket *so)
  487 {
  488         return(raw_usrreqs.pru_disconnect(so));
  489 }
  490 
  491 /*
  492  * key_peeraddr()
  493  * derived from net/rtsock.c:rts_peeraddr()
  494  */
  495 static int
  496 key_peeraddr(struct socket *so, struct sockaddr **nam)
  497 {
  498         return(raw_usrreqs.pru_peeraddr(so, nam));
  499 }
  500 
  501 /*
  502  * key_send()
  503  * derived from net/rtsock.c:rts_send()
  504  */
  505 static int
  506 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  507          struct mbuf *control, struct thread *td)
  508 {
  509         return(raw_usrreqs.pru_send(so, flags, m, nam, control, td));
  510 }
  511 
  512 /*
  513  * key_shutdown()
  514  * derived from net/rtsock.c:rts_shutdown()
  515  */
  516 static int
  517 key_shutdown(struct socket *so)
  518 {
  519         return(raw_usrreqs.pru_shutdown(so));
  520 }
  521 
  522 /*
  523  * key_sockaddr()
  524  * derived from net/rtsock.c:rts_sockaddr()
  525  */
  526 static int
  527 key_sockaddr(struct socket *so, struct sockaddr **nam)
  528 {
  529         return(raw_usrreqs.pru_sockaddr(so, nam));
  530 }
  531 
  532 struct pr_usrreqs key_usrreqs = {
  533         .pru_abort =            key_abort,
  534         .pru_attach =           key_attach,
  535         .pru_bind =             key_bind,
  536         .pru_connect =          key_connect,
  537         .pru_detach =           key_detach,
  538         .pru_disconnect =       key_disconnect,
  539         .pru_peeraddr =         key_peeraddr,
  540         .pru_send =             key_send,
  541         .pru_shutdown =         key_shutdown,
  542         .pru_sockaddr =         key_sockaddr,
  543         .pru_close =            key_close,
  544 };
  545 
  546 /* sysctl */
  547 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
  548 
  549 /*
  550  * Definitions of protocols supported in the KEY domain.
  551  */
  552 
  553 extern struct domain keydomain;
  554 
  555 struct protosw keysw[] = {
  556 {
  557         .pr_type =              SOCK_RAW,
  558         .pr_domain =            &keydomain,
  559         .pr_protocol =          PF_KEY_V2,
  560         .pr_flags =             PR_ATOMIC|PR_ADDR,
  561         .pr_output =            key_output,
  562         .pr_ctlinput =          raw_ctlinput,
  563         .pr_init =              raw_init,
  564         .pr_usrreqs =           &key_usrreqs
  565 }
  566 };
  567 
  568 static void
  569 key_init0(void)
  570 {
  571 
  572         bzero((caddr_t)&V_key_cb, sizeof(V_key_cb));
  573         key_init();
  574 }
  575 
  576 struct domain keydomain = {
  577         .dom_family =           PF_KEY,
  578         .dom_name =             "key",
  579         .dom_init =             key_init0,
  580 #ifdef VIMAGE
  581         .dom_destroy =          key_destroy,
  582 #endif
  583         .dom_protosw =          keysw,
  584         .dom_protoswNPROTOSW =  &keysw[sizeof(keysw)/sizeof(keysw[0])]
  585 };
  586 
  587 VNET_DOMAIN_SET(key);

Cache object: b22d024e43d6c3b148ee8bac02b1d9d1


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