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

Cache object: a7f77c8c3b689a702a071dec14c02995


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