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/12.0/sys/netipsec/keysock.c 336676 2018-07-24 16:35:52Z andrew $       */
    2 /*      $KAME: keysock.c,v 1.25 2001/08/13 20:07:41 itojun Exp $        */
    3 
    4 /*-
    5  * SPDX-License-Identifier: BSD-3-Clause
    6  *
    7  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    8  * All rights reserved.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the project nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  */
   34 
   35 #include "opt_ipsec.h"
   36 
   37 /* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
   38 
   39 #include <sys/types.h>
   40 #include <sys/param.h>
   41 #include <sys/domain.h>
   42 #include <sys/errno.h>
   43 #include <sys/kernel.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/mutex.h>
   48 #include <sys/priv.h>
   49 #include <sys/protosw.h>
   50 #include <sys/signalvar.h>
   51 #include <sys/socket.h>
   52 #include <sys/socketvar.h>
   53 #include <sys/sysctl.h>
   54 #include <sys/systm.h>
   55 
   56 #include <net/if.h>
   57 #include <net/vnet.h>
   58 #include <net/raw_cb.h>
   59 
   60 #include <netinet/in.h>
   61 
   62 #include <net/pfkeyv2.h>
   63 #include <netipsec/key.h>
   64 #include <netipsec/keysock.h>
   65 #include <netipsec/key_debug.h>
   66 #include <netipsec/ipsec.h>
   67 
   68 #include <machine/stdarg.h>
   69 
   70 struct key_cb {
   71         int key_count;
   72         int any_count;
   73 };
   74 VNET_DEFINE_STATIC(struct key_cb, key_cb);
   75 #define V_key_cb                VNET(key_cb)
   76 
   77 static struct sockaddr key_src = { 2, PF_KEY, };
   78 
   79 static int key_sendup0(struct rawcb *, struct mbuf *, int);
   80 
   81 VNET_PCPUSTAT_DEFINE(struct pfkeystat, pfkeystat);
   82 VNET_PCPUSTAT_SYSINIT(pfkeystat);
   83 
   84 #ifdef VIMAGE
   85 VNET_PCPUSTAT_SYSUNINIT(pfkeystat);
   86 #endif /* VIMAGE */
   87 
   88 /*
   89  * key_output()
   90  */
   91 int
   92 key_output(struct mbuf *m, struct socket *so, ...)
   93 {
   94         struct sadb_msg *msg;
   95         int len, error = 0;
   96 
   97         if (m == NULL)
   98                 panic("%s: NULL pointer was passed.\n", __func__);
   99 
  100         PFKEYSTAT_INC(out_total);
  101         PFKEYSTAT_ADD(out_bytes, m->m_pkthdr.len);
  102 
  103         len = m->m_pkthdr.len;
  104         if (len < sizeof(struct sadb_msg)) {
  105                 PFKEYSTAT_INC(out_tooshort);
  106                 error = EINVAL;
  107                 goto end;
  108         }
  109 
  110         if (m->m_len < sizeof(struct sadb_msg)) {
  111                 if ((m = m_pullup(m, sizeof(struct sadb_msg))) == NULL) {
  112                         PFKEYSTAT_INC(out_nomem);
  113                         error = ENOBUFS;
  114                         goto end;
  115                 }
  116         }
  117 
  118         M_ASSERTPKTHDR(m);
  119 
  120         KEYDBG(KEY_DUMP, kdebug_mbuf(m));
  121 
  122         msg = mtod(m, struct sadb_msg *);
  123         PFKEYSTAT_INC(out_msgtype[msg->sadb_msg_type]);
  124         if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
  125                 PFKEYSTAT_INC(out_invlen);
  126                 error = EINVAL;
  127                 goto end;
  128         }
  129 
  130         error = key_parse(m, so);
  131         m = NULL;
  132 end:
  133         if (m)
  134                 m_freem(m);
  135         return error;
  136 }
  137 
  138 /*
  139  * send message to the socket.
  140  */
  141 static int
  142 key_sendup0(struct rawcb *rp, struct mbuf *m, int promisc)
  143 {
  144         int error;
  145 
  146         if (promisc) {
  147                 struct sadb_msg *pmsg;
  148 
  149                 M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT);
  150                 if (m == NULL) {
  151                         PFKEYSTAT_INC(in_nomem);
  152                         return (ENOBUFS);
  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_INC(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_INC(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 /* so can be NULL if target != KEY_SENDUP_ONE */
  176 int
  177 key_sendup_mbuf(struct socket *so, struct mbuf *m, int target)
  178 {
  179         struct mbuf *n;
  180         struct keycb *kp;
  181         struct rawcb *rp;
  182         int error = 0;
  183 
  184         KASSERT(m != NULL, ("NULL mbuf pointer was passed."));
  185         KASSERT(so != NULL || target != KEY_SENDUP_ONE,
  186             ("NULL socket pointer was passed."));
  187         KASSERT(target == KEY_SENDUP_ONE || target == KEY_SENDUP_ALL ||
  188             target == KEY_SENDUP_REGISTERED, ("Wrong target %d", target));
  189 
  190         PFKEYSTAT_INC(in_total);
  191         PFKEYSTAT_ADD(in_bytes, m->m_pkthdr.len);
  192         if (m->m_len < sizeof(struct sadb_msg)) {
  193                 m = m_pullup(m, sizeof(struct sadb_msg));
  194                 if (m == NULL) {
  195                         PFKEYSTAT_INC(in_nomem);
  196                         return ENOBUFS;
  197                 }
  198         }
  199         if (m->m_len >= sizeof(struct sadb_msg)) {
  200                 struct sadb_msg *msg;
  201                 msg = mtod(m, struct sadb_msg *);
  202                 PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
  203         }
  204         mtx_lock(&rawcb_mtx);
  205         if (V_key_cb.any_count == 0) {
  206                 mtx_unlock(&rawcb_mtx);
  207                 m_freem(m);
  208                 return (0);
  209         }
  210         LIST_FOREACH(rp, &V_rawcb_list, list)
  211         {
  212                 if (rp->rcb_proto.sp_family != PF_KEY)
  213                         continue;
  214                 if (rp->rcb_proto.sp_protocol
  215                  && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
  216                         continue;
  217                 }
  218 
  219                 /*
  220                  * If you are in promiscuous mode, and when you get broadcasted
  221                  * reply, you'll get two PF_KEY messages.
  222                  * (based on pf_key@inner.net message on 14 Oct 1998)
  223                  */
  224                 kp = (struct keycb *)rp;
  225                 if (kp->kp_promisc) {
  226                         n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
  227                         if (n != NULL)
  228                                 key_sendup0(rp, n, 1);
  229                         else
  230                                 PFKEYSTAT_INC(in_nomem);
  231                 }
  232 
  233                 /* the exact target will be processed later */
  234                 if (so && sotorawcb(so) == rp)
  235                         continue;
  236 
  237                 if (target == KEY_SENDUP_ONE || (
  238                     target == KEY_SENDUP_REGISTERED && kp->kp_registered == 0))
  239                         continue;
  240 
  241                 /* KEY_SENDUP_ALL + KEY_SENDUP_REGISTERED */
  242                 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
  243                 if (n == NULL) {
  244                         PFKEYSTAT_INC(in_nomem);
  245                         /* Try send to another socket */
  246                         continue;
  247                 }
  248 
  249                 if (key_sendup0(rp, n, 0) == 0)
  250                         PFKEYSTAT_INC(in_msgtarget[target]);
  251         }
  252 
  253         if (so) { /* KEY_SENDUP_ONE */
  254                 error = key_sendup0(sotorawcb(so), m, 0);
  255                 if (error == 0)
  256                         PFKEYSTAT_INC(in_msgtarget[KEY_SENDUP_ONE]);
  257         } else {
  258                 error = 0;
  259                 m_freem(m);
  260         }
  261         mtx_unlock(&rawcb_mtx);
  262         return (error);
  263 }
  264 
  265 /*
  266  * key_abort()
  267  * derived from net/rtsock.c:rts_abort()
  268  */
  269 static void
  270 key_abort(struct socket *so)
  271 {
  272         raw_usrreqs.pru_abort(so);
  273 }
  274 
  275 /*
  276  * key_attach()
  277  * derived from net/rtsock.c:rts_attach()
  278  */
  279 static int
  280 key_attach(struct socket *so, int proto, struct thread *td)
  281 {
  282         struct keycb *kp;
  283         int error;
  284 
  285         KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL"));
  286 
  287         if (td != NULL) {
  288                 error = priv_check(td, PRIV_NET_RAW);
  289                 if (error)
  290                         return error;
  291         }
  292 
  293         /* XXX */
  294         kp = malloc(sizeof *kp, M_PCB, M_WAITOK | M_ZERO); 
  295         if (kp == NULL)
  296                 return ENOBUFS;
  297 
  298         so->so_pcb = (caddr_t)kp;
  299         error = raw_attach(so, proto);
  300         kp = (struct keycb *)sotorawcb(so);
  301         if (error) {
  302                 free(kp, M_PCB);
  303                 so->so_pcb = (caddr_t) 0;
  304                 return error;
  305         }
  306 
  307         kp->kp_promisc = kp->kp_registered = 0;
  308 
  309         if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
  310                 V_key_cb.key_count++;
  311         V_key_cb.any_count++;
  312         soisconnected(so);
  313         so->so_options |= SO_USELOOPBACK;
  314 
  315         return 0;
  316 }
  317 
  318 /*
  319  * key_bind()
  320  * derived from net/rtsock.c:rts_bind()
  321  */
  322 static int
  323 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  324 {
  325   return EINVAL;
  326 }
  327 
  328 /*
  329  * key_close()
  330  * derived from net/rtsock.c:rts_close().
  331  */
  332 static void
  333 key_close(struct socket *so)
  334 {
  335 
  336         raw_usrreqs.pru_close(so);
  337 }
  338 
  339 /*
  340  * key_connect()
  341  * derived from net/rtsock.c:rts_connect()
  342  */
  343 static int
  344 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  345 {
  346         return EINVAL;
  347 }
  348 
  349 /*
  350  * key_detach()
  351  * derived from net/rtsock.c:rts_detach()
  352  */
  353 static void
  354 key_detach(struct socket *so)
  355 {
  356         struct keycb *kp = (struct keycb *)sotorawcb(so);
  357 
  358         KASSERT(kp != NULL, ("key_detach: kp == NULL"));
  359         if (kp->kp_raw.rcb_proto.sp_protocol
  360             == PF_KEY) /* XXX: AF_KEY */
  361                 V_key_cb.key_count--;
  362         V_key_cb.any_count--;
  363 
  364         key_freereg(so);
  365         raw_usrreqs.pru_detach(so);
  366 }
  367 
  368 /*
  369  * key_disconnect()
  370  * derived from net/rtsock.c:key_disconnect()
  371  */
  372 static int
  373 key_disconnect(struct socket *so)
  374 {
  375         return(raw_usrreqs.pru_disconnect(so));
  376 }
  377 
  378 /*
  379  * key_peeraddr()
  380  * derived from net/rtsock.c:rts_peeraddr()
  381  */
  382 static int
  383 key_peeraddr(struct socket *so, struct sockaddr **nam)
  384 {
  385         return(raw_usrreqs.pru_peeraddr(so, nam));
  386 }
  387 
  388 /*
  389  * key_send()
  390  * derived from net/rtsock.c:rts_send()
  391  */
  392 static int
  393 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  394          struct mbuf *control, struct thread *td)
  395 {
  396         return(raw_usrreqs.pru_send(so, flags, m, nam, control, td));
  397 }
  398 
  399 /*
  400  * key_shutdown()
  401  * derived from net/rtsock.c:rts_shutdown()
  402  */
  403 static int
  404 key_shutdown(struct socket *so)
  405 {
  406         return(raw_usrreqs.pru_shutdown(so));
  407 }
  408 
  409 /*
  410  * key_sockaddr()
  411  * derived from net/rtsock.c:rts_sockaddr()
  412  */
  413 static int
  414 key_sockaddr(struct socket *so, struct sockaddr **nam)
  415 {
  416         return(raw_usrreqs.pru_sockaddr(so, nam));
  417 }
  418 
  419 struct pr_usrreqs key_usrreqs = {
  420         .pru_abort =            key_abort,
  421         .pru_attach =           key_attach,
  422         .pru_bind =             key_bind,
  423         .pru_connect =          key_connect,
  424         .pru_detach =           key_detach,
  425         .pru_disconnect =       key_disconnect,
  426         .pru_peeraddr =         key_peeraddr,
  427         .pru_send =             key_send,
  428         .pru_shutdown =         key_shutdown,
  429         .pru_sockaddr =         key_sockaddr,
  430         .pru_close =            key_close,
  431 };
  432 
  433 /* sysctl */
  434 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
  435 
  436 /*
  437  * Definitions of protocols supported in the KEY domain.
  438  */
  439 
  440 extern struct domain keydomain;
  441 
  442 struct protosw keysw[] = {
  443 {
  444         .pr_type =              SOCK_RAW,
  445         .pr_domain =            &keydomain,
  446         .pr_protocol =          PF_KEY_V2,
  447         .pr_flags =             PR_ATOMIC|PR_ADDR,
  448         .pr_output =            key_output,
  449         .pr_ctlinput =          raw_ctlinput,
  450         .pr_init =              raw_init,
  451         .pr_usrreqs =           &key_usrreqs
  452 }
  453 };
  454 
  455 static void
  456 key_init0(void)
  457 {
  458 
  459         bzero((caddr_t)&V_key_cb, sizeof(V_key_cb));
  460         key_init();
  461 }
  462 
  463 struct domain keydomain = {
  464         .dom_family =           PF_KEY,
  465         .dom_name =             "key",
  466         .dom_init =             key_init0,
  467 #ifdef VIMAGE
  468         .dom_destroy =          key_destroy,
  469 #endif
  470         .dom_protosw =          keysw,
  471         .dom_protoswNPROTOSW =  &keysw[nitems(keysw)]
  472 };
  473 
  474 VNET_DOMAIN_SET(key);

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