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/5.1/sys/netipsec/keysock.c 113255 2003-04-08 14:25:47Z des $   */
    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/malloc.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/protosw.h>
   45 #include <sys/signalvar.h>
   46 #include <sys/socket.h>
   47 #include <sys/socketvar.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/systm.h>
   50 
   51 #include <net/raw_cb.h>
   52 #include <net/route.h>
   53 
   54 #include <net/pfkeyv2.h>
   55 #include <netipsec/key.h>
   56 #include <netipsec/keysock.h>
   57 #include <netipsec/key_debug.h>
   58 
   59 #include <machine/stdarg.h>
   60 
   61 struct key_cb {
   62         int key_count;
   63         int any_count;
   64 };
   65 static struct key_cb key_cb;
   66 
   67 static struct sockaddr key_dst = { 2, PF_KEY, };
   68 static struct sockaddr key_src = { 2, PF_KEY, };
   69 
   70 static int key_sendup0 __P((struct rawcb *, struct mbuf *, int));
   71 
   72 struct pfkeystat pfkeystat;
   73 
   74 /*
   75  * key_output()
   76  */
   77 int
   78 #if __STDC__
   79 key_output(struct mbuf *m, ...)
   80 #else
   81 key_output(m, va_alist)
   82         struct mbuf *m;
   83         va_dcl
   84 #endif
   85 {
   86         struct sadb_msg *msg;
   87         int len, error = 0;
   88         int s;
   89         struct socket *so;
   90         va_list ap;
   91 
   92         va_start(ap, m);
   93         so = va_arg(ap, struct socket *);
   94         va_end(ap);
   95 
   96         if (m == 0)
   97                 panic("key_output: NULL pointer was passed.\n");
   98 
   99         pfkeystat.out_total++;
  100         pfkeystat.out_bytes += m->m_pkthdr.len;
  101 
  102         len = m->m_pkthdr.len;
  103         if (len < sizeof(struct sadb_msg)) {
  104                 pfkeystat.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.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.out_msgtype[msg->sadb_msg_type]++;
  123         if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
  124                 pfkeystat.out_invlen++;
  125                 error = EINVAL;
  126                 goto end;
  127         }
  128 
  129         /*XXX giant lock*/
  130         s = splnet();
  131         error = key_parse(m, so);
  132         m = NULL;
  133         splx(s);
  134 end:
  135         if (m)
  136                 m_freem(m);
  137         return error;
  138 }
  139 
  140 /*
  141  * send message to the socket.
  142  */
  143 static int
  144 key_sendup0(rp, m, promisc)
  145         struct rawcb *rp;
  146         struct mbuf *m;
  147         int promisc;
  148 {
  149         int error;
  150 
  151         if (promisc) {
  152                 struct sadb_msg *pmsg;
  153 
  154                 M_PREPEND(m, sizeof(struct sadb_msg), M_DONTWAIT);
  155                 if (m && m->m_len < sizeof(struct sadb_msg))
  156                         m = m_pullup(m, sizeof(struct sadb_msg));
  157                 if (!m) {
  158                         pfkeystat.in_nomem++;
  159                         m_freem(m);
  160                         return ENOBUFS;
  161                 }
  162                 m->m_pkthdr.len += sizeof(*pmsg);
  163 
  164                 pmsg = mtod(m, struct sadb_msg *);
  165                 bzero(pmsg, sizeof(*pmsg));
  166                 pmsg->sadb_msg_version = PF_KEY_V2;
  167                 pmsg->sadb_msg_type = SADB_X_PROMISC;
  168                 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
  169                 /* pid and seq? */
  170 
  171                 pfkeystat.in_msgtype[pmsg->sadb_msg_type]++;
  172         }
  173 
  174         if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
  175             m, NULL)) {
  176                 pfkeystat.in_nomem++;
  177                 m_freem(m);
  178                 error = ENOBUFS;
  179         } else
  180                 error = 0;
  181         sorwakeup(rp->rcb_socket);
  182         return error;
  183 }
  184 
  185 /* XXX this interface should be obsoleted. */
  186 int
  187 key_sendup(so, msg, len, target)
  188         struct socket *so;
  189         struct sadb_msg *msg;
  190         u_int len;
  191         int target;     /*target of the resulting message*/
  192 {
  193         struct mbuf *m, *n, *mprev;
  194         int tlen;
  195 
  196         /* sanity check */
  197         if (so == 0 || msg == 0)
  198                 panic("key_sendup: NULL pointer was passed.\n");
  199 
  200         KEYDEBUG(KEYDEBUG_KEY_DUMP,
  201                 printf("key_sendup: \n");
  202                 kdebug_sadb(msg));
  203 
  204         /*
  205          * we increment statistics here, just in case we have ENOBUFS
  206          * in this function.
  207          */
  208         pfkeystat.in_total++;
  209         pfkeystat.in_bytes += len;
  210         pfkeystat.in_msgtype[msg->sadb_msg_type]++;
  211 
  212         /*
  213          * Get mbuf chain whenever possible (not clusters),
  214          * to save socket buffer.  We'll be generating many SADB_ACQUIRE
  215          * messages to listening key sockets.  If we simply allocate clusters,
  216          * sbappendaddr() will raise ENOBUFS due to too little sbspace().
  217          * sbspace() computes # of actual data bytes AND mbuf region.
  218          *
  219          * TODO: SADB_ACQUIRE filters should be implemented.
  220          */
  221         tlen = len;
  222         m = mprev = NULL;
  223         while (tlen > 0) {
  224                 if (tlen == len) {
  225                         MGETHDR(n, M_DONTWAIT, MT_DATA);
  226                         n->m_len = MHLEN;
  227                 } else {
  228                         MGET(n, M_DONTWAIT, MT_DATA);
  229                         n->m_len = MLEN;
  230                 }
  231                 if (!n) {
  232                         pfkeystat.in_nomem++;
  233                         return ENOBUFS;
  234                 }
  235                 if (tlen >= MCLBYTES) { /*XXX better threshold? */
  236                         MCLGET(n, M_DONTWAIT);
  237                         if ((n->m_flags & M_EXT) == 0) {
  238                                 m_free(n);
  239                                 m_freem(m);
  240                                 pfkeystat.in_nomem++;
  241                                 return ENOBUFS;
  242                         }
  243                         n->m_len = MCLBYTES;
  244                 }
  245 
  246                 if (tlen < n->m_len)
  247                         n->m_len = tlen;
  248                 n->m_next = NULL;
  249                 if (m == NULL)
  250                         m = mprev = n;
  251                 else {
  252                         mprev->m_next = n;
  253                         mprev = n;
  254                 }
  255                 tlen -= n->m_len;
  256                 n = NULL;
  257         }
  258         m->m_pkthdr.len = len;
  259         m->m_pkthdr.rcvif = NULL;
  260         m_copyback(m, 0, len, (caddr_t)msg);
  261 
  262         /* avoid duplicated statistics */
  263         pfkeystat.in_total--;
  264         pfkeystat.in_bytes -= len;
  265         pfkeystat.in_msgtype[msg->sadb_msg_type]--;
  266 
  267         return key_sendup_mbuf(so, m, target);
  268 }
  269 
  270 /* so can be NULL if target != KEY_SENDUP_ONE */
  271 int
  272 key_sendup_mbuf(so, m, target)
  273         struct socket *so;
  274         struct mbuf *m;
  275         int target;
  276 {
  277         struct mbuf *n;
  278         struct keycb *kp;
  279         int sendup;
  280         struct rawcb *rp;
  281         int error = 0;
  282 
  283         if (m == NULL)
  284                 panic("key_sendup_mbuf: NULL pointer was passed.\n");
  285         if (so == NULL && target == KEY_SENDUP_ONE)
  286                 panic("key_sendup_mbuf: NULL pointer was passed.\n");
  287 
  288         pfkeystat.in_total++;
  289         pfkeystat.in_bytes += m->m_pkthdr.len;
  290         if (m->m_len < sizeof(struct sadb_msg)) {
  291 #if 1
  292                 m = m_pullup(m, sizeof(struct sadb_msg));
  293                 if (m == NULL) {
  294                         pfkeystat.in_nomem++;
  295                         return ENOBUFS;
  296                 }
  297 #else
  298                 /* don't bother pulling it up just for stats */
  299 #endif
  300         }
  301         if (m->m_len >= sizeof(struct sadb_msg)) {
  302                 struct sadb_msg *msg;
  303                 msg = mtod(m, struct sadb_msg *);
  304                 pfkeystat.in_msgtype[msg->sadb_msg_type]++;
  305         }
  306 
  307         LIST_FOREACH(rp, &rawcb_list, list)
  308         {
  309                 if (rp->rcb_proto.sp_family != PF_KEY)
  310                         continue;
  311                 if (rp->rcb_proto.sp_protocol
  312                  && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
  313                         continue;
  314                 }
  315 
  316                 kp = (struct keycb *)rp;
  317 
  318                 /*
  319                  * If you are in promiscuous mode, and when you get broadcasted
  320                  * reply, you'll get two PF_KEY messages.
  321                  * (based on pf_key@inner.net message on 14 Oct 1998)
  322                  */
  323                 if (((struct keycb *)rp)->kp_promisc) {
  324                         if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
  325                                 (void)key_sendup0(rp, n, 1);
  326                                 n = NULL;
  327                         }
  328                 }
  329 
  330                 /* the exact target will be processed later */
  331                 if (so && sotorawcb(so) == rp)
  332                         continue;
  333 
  334                 sendup = 0;
  335                 switch (target) {
  336                 case KEY_SENDUP_ONE:
  337                         /* the statement has no effect */
  338                         if (so && sotorawcb(so) == rp)
  339                                 sendup++;
  340                         break;
  341                 case KEY_SENDUP_ALL:
  342                         sendup++;
  343                         break;
  344                 case KEY_SENDUP_REGISTERED:
  345                         if (kp->kp_registered)
  346                                 sendup++;
  347                         break;
  348                 }
  349                 pfkeystat.in_msgtarget[target]++;
  350 
  351                 if (!sendup)
  352                         continue;
  353 
  354                 if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
  355                         m_freem(m);
  356                         pfkeystat.in_nomem++;
  357                         return ENOBUFS;
  358                 }
  359 
  360                 if ((error = key_sendup0(rp, n, 0)) != 0) {
  361                         m_freem(m);
  362                         return error;
  363                 }
  364 
  365                 n = NULL;
  366         }
  367 
  368         if (so) {
  369                 error = key_sendup0(sotorawcb(so), m, 0);
  370                 m = NULL;
  371         } else {
  372                 error = 0;
  373                 m_freem(m);
  374         }
  375         return error;
  376 }
  377 
  378 /*
  379  * key_abort()
  380  * derived from net/rtsock.c:rts_abort()
  381  */
  382 static int
  383 key_abort(struct socket *so)
  384 {
  385         int s, error;
  386         s = splnet();
  387         error = raw_usrreqs.pru_abort(so);
  388         splx(s);
  389         return error;
  390 }
  391 
  392 /*
  393  * key_attach()
  394  * derived from net/rtsock.c:rts_attach()
  395  */
  396 static int
  397 key_attach(struct socket *so, int proto, struct thread *td)
  398 {
  399         struct keycb *kp;
  400         int s, error;
  401 
  402         if (sotorawcb(so) != 0)
  403                 return EISCONN; /* XXX panic? */
  404         kp = (struct keycb *)malloc(sizeof *kp, M_PCB, M_WAITOK|M_ZERO); /* XXX */
  405         if (kp == 0)
  406                 return ENOBUFS;
  407 
  408         /*
  409          * The splnet() is necessary to block protocols from sending
  410          * error notifications (like RTM_REDIRECT or RTM_LOSING) while
  411          * this PCB is extant but incompletely initialized.
  412          * Probably we should try to do more of this work beforehand and
  413          * eliminate the spl.
  414          */
  415         s = splnet();
  416         so->so_pcb = (caddr_t)kp;
  417         error = raw_usrreqs.pru_attach(so, proto, td);
  418         kp = (struct keycb *)sotorawcb(so);
  419         if (error) {
  420                 free(kp, M_PCB);
  421                 so->so_pcb = (caddr_t) 0;
  422                 splx(s);
  423                 return error;
  424         }
  425 
  426         kp->kp_promisc = kp->kp_registered = 0;
  427 
  428         if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
  429                 key_cb.key_count++;
  430         key_cb.any_count++;
  431         kp->kp_raw.rcb_laddr = &key_src;
  432         kp->kp_raw.rcb_faddr = &key_dst;
  433         soisconnected(so);
  434         so->so_options |= SO_USELOOPBACK;
  435 
  436         splx(s);
  437         return 0;
  438 }
  439 
  440 /*
  441  * key_bind()
  442  * derived from net/rtsock.c:rts_bind()
  443  */
  444 static int
  445 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  446 {
  447         int s, error;
  448         s = splnet();
  449         error = raw_usrreqs.pru_bind(so, nam, td); /* xxx just EINVAL */
  450         splx(s);
  451         return error;
  452 }
  453 
  454 /*
  455  * key_connect()
  456  * derived from net/rtsock.c:rts_connect()
  457  */
  458 static int
  459 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  460 {
  461         int s, error;
  462         s = splnet();
  463         error = raw_usrreqs.pru_connect(so, nam, td); /* XXX just EINVAL */
  464         splx(s);
  465         return error;
  466 }
  467 
  468 /*
  469  * key_detach()
  470  * derived from net/rtsock.c:rts_detach()
  471  */
  472 static int
  473 key_detach(struct socket *so)
  474 {
  475         struct keycb *kp = (struct keycb *)sotorawcb(so);
  476         int s, error;
  477 
  478         s = splnet();
  479         if (kp != 0) {
  480                 if (kp->kp_raw.rcb_proto.sp_protocol
  481                     == PF_KEY) /* XXX: AF_KEY */
  482                         key_cb.key_count--;
  483                 key_cb.any_count--;
  484 
  485                 key_freereg(so);
  486         }
  487         error = raw_usrreqs.pru_detach(so);
  488         splx(s);
  489         return error;
  490 }
  491 
  492 /*
  493  * key_disconnect()
  494  * derived from net/rtsock.c:key_disconnect()
  495  */
  496 static int
  497 key_disconnect(struct socket *so)
  498 {
  499         int s, error;
  500         s = splnet();
  501         error = raw_usrreqs.pru_disconnect(so);
  502         splx(s);
  503         return error;
  504 }
  505 
  506 /*
  507  * key_peeraddr()
  508  * derived from net/rtsock.c:rts_peeraddr()
  509  */
  510 static int
  511 key_peeraddr(struct socket *so, struct sockaddr **nam)
  512 {
  513         int s, error;
  514         s = splnet();
  515         error = raw_usrreqs.pru_peeraddr(so, nam);
  516         splx(s);
  517         return error;
  518 }
  519 
  520 /*
  521  * key_send()
  522  * derived from net/rtsock.c:rts_send()
  523  */
  524 static int
  525 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  526          struct mbuf *control, struct thread *td)
  527 {
  528         int s, error;
  529         s = splnet();
  530         error = raw_usrreqs.pru_send(so, flags, m, nam, control, td);
  531         splx(s);
  532         return error;
  533 }
  534 
  535 /*
  536  * key_shutdown()
  537  * derived from net/rtsock.c:rts_shutdown()
  538  */
  539 static int
  540 key_shutdown(struct socket *so)
  541 {
  542         int s, error;
  543         s = splnet();
  544         error = raw_usrreqs.pru_shutdown(so);
  545         splx(s);
  546         return error;
  547 }
  548 
  549 /*
  550  * key_sockaddr()
  551  * derived from net/rtsock.c:rts_sockaddr()
  552  */
  553 static int
  554 key_sockaddr(struct socket *so, struct sockaddr **nam)
  555 {
  556         int s, error;
  557         s = splnet();
  558         error = raw_usrreqs.pru_sockaddr(so, nam);
  559         splx(s);
  560         return error;
  561 }
  562 
  563 struct pr_usrreqs key_usrreqs = {
  564         key_abort, pru_accept_notsupp, key_attach, key_bind,
  565         key_connect,
  566         pru_connect2_notsupp, pru_control_notsupp, key_detach,
  567         key_disconnect, pru_listen_notsupp, key_peeraddr,
  568         pru_rcvd_notsupp,
  569         pru_rcvoob_notsupp, key_send, pru_sense_null, key_shutdown,
  570         key_sockaddr, sosend, soreceive, sopoll
  571 };
  572 
  573 /* sysctl */
  574 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
  575 
  576 /*
  577  * Definitions of protocols supported in the KEY domain.
  578  */
  579 
  580 extern struct domain keydomain;
  581 
  582 struct protosw keysw[] = {
  583 { SOCK_RAW,     &keydomain,     PF_KEY_V2,      PR_ATOMIC|PR_ADDR,
  584   0,            (pr_output_t *)key_output,      raw_ctlinput, 0,
  585   0,
  586   raw_init,     0,              0,              0,
  587   &key_usrreqs
  588 }
  589 };
  590 
  591 static void
  592 key_init0(void)
  593 {
  594         bzero((caddr_t)&key_cb, sizeof(key_cb));
  595         key_init();
  596 }
  597 
  598 struct domain keydomain =
  599     { PF_KEY, "key", key_init0, 0, 0,
  600       keysw, &keysw[sizeof(keysw)/sizeof(keysw[0])] };
  601 
  602 DOMAIN_SET(key);

Cache object: 259bc23dd77ec88b50c496ed1f33202b


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