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 /*      $FreeBSD$       */
    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/protosw.h>
   47 #include <sys/signalvar.h>
   48 #include <sys/socket.h>
   49 #include <sys/socketvar.h>
   50 #include <sys/sysctl.h>
   51 #include <sys/systm.h>
   52 
   53 #include <net/raw_cb.h>
   54 #include <net/route.h>
   55 
   56 #include <net/pfkeyv2.h>
   57 #include <netipsec/key.h>
   58 #include <netipsec/keysock.h>
   59 #include <netipsec/key_debug.h>
   60 
   61 #include <machine/stdarg.h>
   62 
   63 struct key_cb {
   64         int key_count;
   65         int any_count;
   66 };
   67 static struct key_cb key_cb;
   68 
   69 static struct sockaddr key_dst = { 2, PF_KEY, };
   70 static struct sockaddr key_src = { 2, PF_KEY, };
   71 
   72 static int key_sendup0 __P((struct rawcb *, struct mbuf *, int));
   73 
   74 struct pfkeystat pfkeystat;
   75 
   76 /*
   77  * key_output()
   78  */
   79 int
   80 key_output(struct mbuf *m, struct socket *so)
   81 {
   82         struct sadb_msg *msg;
   83         int len, error = 0;
   84         int s;
   85 
   86         if (m == 0)
   87                 panic("%s: NULL pointer was passed.\n", __func__);
   88 
   89         pfkeystat.out_total++;
   90         pfkeystat.out_bytes += m->m_pkthdr.len;
   91 
   92         len = m->m_pkthdr.len;
   93         if (len < sizeof(struct sadb_msg)) {
   94                 pfkeystat.out_tooshort++;
   95                 error = EINVAL;
   96                 goto end;
   97         }
   98 
   99         if (m->m_len < sizeof(struct sadb_msg)) {
  100                 if ((m = m_pullup(m, sizeof(struct sadb_msg))) == 0) {
  101                         pfkeystat.out_nomem++;
  102                         error = ENOBUFS;
  103                         goto end;
  104                 }
  105         }
  106 
  107         M_ASSERTPKTHDR(m);
  108 
  109         KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m));
  110 
  111         msg = mtod(m, struct sadb_msg *);
  112         pfkeystat.out_msgtype[msg->sadb_msg_type]++;
  113         if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
  114                 pfkeystat.out_invlen++;
  115                 error = EINVAL;
  116                 goto end;
  117         }
  118 
  119         /*XXX giant lock*/
  120         s = splnet();
  121         error = key_parse(m, so);
  122         m = NULL;
  123         splx(s);
  124 end:
  125         if (m)
  126                 m_freem(m);
  127         return error;
  128 }
  129 
  130 /*
  131  * send message to the socket.
  132  */
  133 static int
  134 key_sendup0(rp, m, promisc)
  135         struct rawcb *rp;
  136         struct mbuf *m;
  137         int promisc;
  138 {
  139         int error;
  140 
  141         if (promisc) {
  142                 struct sadb_msg *pmsg;
  143 
  144                 M_PREPEND(m, sizeof(struct sadb_msg), M_DONTWAIT);
  145                 if (m && m->m_len < sizeof(struct sadb_msg))
  146                         m = m_pullup(m, sizeof(struct sadb_msg));
  147                 if (!m) {
  148                         pfkeystat.in_nomem++;
  149                         m_freem(m);
  150                         return ENOBUFS;
  151                 }
  152                 m->m_pkthdr.len += sizeof(*pmsg);
  153 
  154                 pmsg = mtod(m, struct sadb_msg *);
  155                 bzero(pmsg, sizeof(*pmsg));
  156                 pmsg->sadb_msg_version = PF_KEY_V2;
  157                 pmsg->sadb_msg_type = SADB_X_PROMISC;
  158                 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
  159                 /* pid and seq? */
  160 
  161                 pfkeystat.in_msgtype[pmsg->sadb_msg_type]++;
  162         }
  163 
  164         if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
  165             m, NULL)) {
  166                 pfkeystat.in_nomem++;
  167                 m_freem(m);
  168                 error = ENOBUFS;
  169         } else
  170                 error = 0;
  171         sorwakeup(rp->rcb_socket);
  172         return error;
  173 }
  174 
  175 /* XXX this interface should be obsoleted. */
  176 int
  177 key_sendup(so, msg, len, target)
  178         struct socket *so;
  179         struct sadb_msg *msg;
  180         u_int len;
  181         int target;     /*target of the resulting message*/
  182 {
  183         struct mbuf *m, *n, *mprev;
  184         int tlen;
  185 
  186         /* sanity check */
  187         if (so == 0 || msg == 0)
  188                 panic("%s: NULL pointer was passed.\n", __func__);
  189 
  190         KEYDEBUG(KEYDEBUG_KEY_DUMP,
  191                 printf("%s: \n", __func__);
  192                 kdebug_sadb(msg));
  193 
  194         /*
  195          * we increment statistics here, just in case we have ENOBUFS
  196          * in this function.
  197          */
  198         pfkeystat.in_total++;
  199         pfkeystat.in_bytes += len;
  200         pfkeystat.in_msgtype[msg->sadb_msg_type]++;
  201 
  202         /*
  203          * Get mbuf chain whenever possible (not clusters),
  204          * to save socket buffer.  We'll be generating many SADB_ACQUIRE
  205          * messages to listening key sockets.  If we simply allocate clusters,
  206          * sbappendaddr() will raise ENOBUFS due to too little sbspace().
  207          * sbspace() computes # of actual data bytes AND mbuf region.
  208          *
  209          * TODO: SADB_ACQUIRE filters should be implemented.
  210          */
  211         tlen = len;
  212         m = mprev = NULL;
  213         while (tlen > 0) {
  214                 if (tlen == len) {
  215                         MGETHDR(n, M_DONTWAIT, MT_DATA);
  216                         n->m_len = MHLEN;
  217                 } else {
  218                         MGET(n, M_DONTWAIT, MT_DATA);
  219                         n->m_len = MLEN;
  220                 }
  221                 if (!n) {
  222                         pfkeystat.in_nomem++;
  223                         return ENOBUFS;
  224                 }
  225                 if (tlen >= MCLBYTES) { /*XXX better threshold? */
  226                         MCLGET(n, M_DONTWAIT);
  227                         if ((n->m_flags & M_EXT) == 0) {
  228                                 m_free(n);
  229                                 m_freem(m);
  230                                 pfkeystat.in_nomem++;
  231                                 return ENOBUFS;
  232                         }
  233                         n->m_len = MCLBYTES;
  234                 }
  235 
  236                 if (tlen < n->m_len)
  237                         n->m_len = tlen;
  238                 n->m_next = NULL;
  239                 if (m == NULL)
  240                         m = mprev = n;
  241                 else {
  242                         mprev->m_next = n;
  243                         mprev = n;
  244                 }
  245                 tlen -= n->m_len;
  246                 n = NULL;
  247         }
  248         m->m_pkthdr.len = len;
  249         m->m_pkthdr.rcvif = NULL;
  250         m_copyback(m, 0, len, (caddr_t)msg);
  251 
  252         /* avoid duplicated statistics */
  253         pfkeystat.in_total--;
  254         pfkeystat.in_bytes -= len;
  255         pfkeystat.in_msgtype[msg->sadb_msg_type]--;
  256 
  257         return key_sendup_mbuf(so, m, target);
  258 }
  259 
  260 /* so can be NULL if target != KEY_SENDUP_ONE */
  261 int
  262 key_sendup_mbuf(so, m, target)
  263         struct socket *so;
  264         struct mbuf *m;
  265         int target;
  266 {
  267         struct mbuf *n;
  268         struct keycb *kp;
  269         int sendup;
  270         struct rawcb *rp;
  271         int error = 0;
  272 
  273         if (m == NULL)
  274                 panic("key_sendup_mbuf: NULL pointer was passed.\n");
  275         if (so == NULL && target == KEY_SENDUP_ONE)
  276                 panic("%s: NULL pointer was passed.\n", __func__);
  277 
  278         pfkeystat.in_total++;
  279         pfkeystat.in_bytes += m->m_pkthdr.len;
  280         if (m->m_len < sizeof(struct sadb_msg)) {
  281 #if 1
  282                 m = m_pullup(m, sizeof(struct sadb_msg));
  283                 if (m == NULL) {
  284                         pfkeystat.in_nomem++;
  285                         return ENOBUFS;
  286                 }
  287 #else
  288                 /* don't bother pulling it up just for stats */
  289 #endif
  290         }
  291         if (m->m_len >= sizeof(struct sadb_msg)) {
  292                 struct sadb_msg *msg;
  293                 msg = mtod(m, struct sadb_msg *);
  294                 pfkeystat.in_msgtype[msg->sadb_msg_type]++;
  295         }
  296 
  297         LIST_FOREACH(rp, &rawcb_list, list)
  298         {
  299                 if (rp->rcb_proto.sp_family != PF_KEY)
  300                         continue;
  301                 if (rp->rcb_proto.sp_protocol
  302                  && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
  303                         continue;
  304                 }
  305 
  306                 kp = (struct keycb *)rp;
  307 
  308                 /*
  309                  * If you are in promiscuous mode, and when you get broadcasted
  310                  * reply, you'll get two PF_KEY messages.
  311                  * (based on pf_key@inner.net message on 14 Oct 1998)
  312                  */
  313                 if (((struct keycb *)rp)->kp_promisc) {
  314                         if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
  315                                 (void)key_sendup0(rp, n, 1);
  316                                 n = NULL;
  317                         }
  318                 }
  319 
  320                 /* the exact target will be processed later */
  321                 if (so && sotorawcb(so) == rp)
  322                         continue;
  323 
  324                 sendup = 0;
  325                 switch (target) {
  326                 case KEY_SENDUP_ONE:
  327                         /* the statement has no effect */
  328                         if (so && sotorawcb(so) == rp)
  329                                 sendup++;
  330                         break;
  331                 case KEY_SENDUP_ALL:
  332                         sendup++;
  333                         break;
  334                 case KEY_SENDUP_REGISTERED:
  335                         if (kp->kp_registered)
  336                                 sendup++;
  337                         break;
  338                 }
  339                 pfkeystat.in_msgtarget[target]++;
  340 
  341                 if (!sendup)
  342                         continue;
  343 
  344                 if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
  345                         m_freem(m);
  346                         pfkeystat.in_nomem++;
  347                         return ENOBUFS;
  348                 }
  349 
  350                 if ((error = key_sendup0(rp, n, 0)) != 0) {
  351                         m_freem(m);
  352                         return error;
  353                 }
  354 
  355                 n = NULL;
  356         }
  357 
  358         if (so) {
  359                 error = key_sendup0(sotorawcb(so), m, 0);
  360                 m = NULL;
  361         } else {
  362                 error = 0;
  363                 m_freem(m);
  364         }
  365         return error;
  366 }
  367 
  368 /*
  369  * key_abort()
  370  * derived from net/rtsock.c:rts_abort()
  371  */
  372 static int
  373 key_abort(struct socket *so)
  374 {
  375         int s, error;
  376         s = splnet();
  377         error = raw_usrreqs.pru_abort(so);
  378         splx(s);
  379         return error;
  380 }
  381 
  382 /*
  383  * key_attach()
  384  * derived from net/rtsock.c:rts_attach()
  385  */
  386 static int
  387 key_attach(struct socket *so, int proto, struct thread *td)
  388 {
  389         struct keycb *kp;
  390         int s, error;
  391 
  392         if (sotorawcb(so) != 0)
  393                 return EISCONN; /* XXX panic? */
  394         kp = (struct keycb *)malloc(sizeof *kp, M_PCB, M_WAITOK|M_ZERO); /* XXX */
  395         if (kp == 0)
  396                 return ENOBUFS;
  397 
  398         /*
  399          * The splnet() is necessary to block protocols from sending
  400          * error notifications (like RTM_REDIRECT or RTM_LOSING) while
  401          * this PCB is extant but incompletely initialized.
  402          * Probably we should try to do more of this work beforehand and
  403          * eliminate the spl.
  404          */
  405         s = splnet();
  406         so->so_pcb = (caddr_t)kp;
  407         error = raw_usrreqs.pru_attach(so, proto, td);
  408         kp = (struct keycb *)sotorawcb(so);
  409         if (error) {
  410                 free(kp, M_PCB);
  411                 so->so_pcb = (caddr_t) 0;
  412                 splx(s);
  413                 return error;
  414         }
  415 
  416         kp->kp_promisc = kp->kp_registered = 0;
  417 
  418         if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
  419                 key_cb.key_count++;
  420         key_cb.any_count++;
  421         kp->kp_raw.rcb_laddr = &key_src;
  422         kp->kp_raw.rcb_faddr = &key_dst;
  423         soisconnected(so);
  424         so->so_options |= SO_USELOOPBACK;
  425 
  426         splx(s);
  427         return 0;
  428 }
  429 
  430 /*
  431  * key_bind()
  432  * derived from net/rtsock.c:rts_bind()
  433  */
  434 static int
  435 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  436 {
  437         int s, error;
  438         s = splnet();
  439         error = raw_usrreqs.pru_bind(so, nam, td); /* xxx just EINVAL */
  440         splx(s);
  441         return error;
  442 }
  443 
  444 /*
  445  * key_connect()
  446  * derived from net/rtsock.c:rts_connect()
  447  */
  448 static int
  449 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  450 {
  451         int s, error;
  452         s = splnet();
  453         error = raw_usrreqs.pru_connect(so, nam, td); /* XXX just EINVAL */
  454         splx(s);
  455         return error;
  456 }
  457 
  458 /*
  459  * key_detach()
  460  * derived from net/rtsock.c:rts_detach()
  461  */
  462 static int
  463 key_detach(struct socket *so)
  464 {
  465         struct keycb *kp = (struct keycb *)sotorawcb(so);
  466         int s, error;
  467 
  468         s = splnet();
  469         if (kp != 0) {
  470                 if (kp->kp_raw.rcb_proto.sp_protocol
  471                     == PF_KEY) /* XXX: AF_KEY */
  472                         key_cb.key_count--;
  473                 key_cb.any_count--;
  474 
  475                 key_freereg(so);
  476         }
  477         error = raw_usrreqs.pru_detach(so);
  478         splx(s);
  479         return error;
  480 }
  481 
  482 /*
  483  * key_disconnect()
  484  * derived from net/rtsock.c:key_disconnect()
  485  */
  486 static int
  487 key_disconnect(struct socket *so)
  488 {
  489         int s, error;
  490         s = splnet();
  491         error = raw_usrreqs.pru_disconnect(so);
  492         splx(s);
  493         return error;
  494 }
  495 
  496 /*
  497  * key_peeraddr()
  498  * derived from net/rtsock.c:rts_peeraddr()
  499  */
  500 static int
  501 key_peeraddr(struct socket *so, struct sockaddr **nam)
  502 {
  503         int s, error;
  504         s = splnet();
  505         error = raw_usrreqs.pru_peeraddr(so, nam);
  506         splx(s);
  507         return error;
  508 }
  509 
  510 /*
  511  * key_send()
  512  * derived from net/rtsock.c:rts_send()
  513  */
  514 static int
  515 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  516          struct mbuf *control, struct thread *td)
  517 {
  518         int s, error;
  519         s = splnet();
  520         error = raw_usrreqs.pru_send(so, flags, m, nam, control, td);
  521         splx(s);
  522         return error;
  523 }
  524 
  525 /*
  526  * key_shutdown()
  527  * derived from net/rtsock.c:rts_shutdown()
  528  */
  529 static int
  530 key_shutdown(struct socket *so)
  531 {
  532         int s, error;
  533         s = splnet();
  534         error = raw_usrreqs.pru_shutdown(so);
  535         splx(s);
  536         return error;
  537 }
  538 
  539 /*
  540  * key_sockaddr()
  541  * derived from net/rtsock.c:rts_sockaddr()
  542  */
  543 static int
  544 key_sockaddr(struct socket *so, struct sockaddr **nam)
  545 {
  546         int s, error;
  547         s = splnet();
  548         error = raw_usrreqs.pru_sockaddr(so, nam);
  549         splx(s);
  550         return error;
  551 }
  552 
  553 struct pr_usrreqs key_usrreqs = {
  554         key_abort, pru_accept_notsupp, key_attach, key_bind,
  555         key_connect,
  556         pru_connect2_notsupp, pru_control_notsupp, key_detach,
  557         key_disconnect, pru_listen_notsupp, key_peeraddr,
  558         pru_rcvd_notsupp,
  559         pru_rcvoob_notsupp, key_send, pru_sense_null, key_shutdown,
  560         key_sockaddr, sosend, soreceive, sopoll,
  561         pru_sosetlabel_null
  562 };
  563 
  564 /* sysctl */
  565 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
  566 
  567 /*
  568  * Definitions of protocols supported in the KEY domain.
  569  */
  570 
  571 extern struct domain keydomain;
  572 
  573 struct protosw keysw[] = {
  574 { SOCK_RAW,     &keydomain,     PF_KEY_V2,      PR_ATOMIC|PR_ADDR,
  575   0,            key_output,     raw_ctlinput, 0,
  576   0,
  577   raw_init,     0,              0,              0,
  578   &key_usrreqs
  579 }
  580 };
  581 
  582 static void
  583 key_init0(void)
  584 {
  585         bzero((caddr_t)&key_cb, sizeof(key_cb));
  586         key_init();
  587 }
  588 
  589 struct domain keydomain =
  590     { PF_KEY, "key", key_init0, 0, 0,
  591       keysw, &keysw[sizeof(keysw)/sizeof(keysw[0])] };
  592 
  593 DOMAIN_SET(key);

Cache object: c8cfa562d42efd0cb3cf43faf37562e7


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