sys/netproto/key/keysock.c

   1 /*
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/sys/netkey/keysock.c,v 1.1.2.4 2003/01/11 19:10:59 ume Exp $
  30  * $KAME: keysock.c,v 1.25 2001/08/13 20:07:41 itojun Exp $
  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/systm.h>
  40 #include <sys/kernel.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/mbuf.h>
  43 #include <sys/malloc.h>
  44 #include <sys/socket.h>
  45 #include <sys/socketvar.h>
  46 #include <sys/domain.h>
  47 #include <sys/protosw.h>
  48 #include <sys/errno.h>
  49 #include <sys/socketvar2.h>
  50
  51 #include <sys/thread2.h>
  52 #include <sys/msgport2.h>
  53
  54 #include <net/raw_cb.h>
  55 #include <net/route.h>
  56 #include <net/netmsg.h>
  57 #include <netinet/in.h>
  58
  59 #include <net/pfkeyv2.h>
  60 #include <net/netmsg2.h>
  61
  62 #include "keydb.h"
  63 #include "key.h"
  64 #include "keysock.h"
  65 #include "key_debug.h"
  66
  67 #include <machine/stdarg.h>
  68
  69 struct sockaddr key_dst = { 2, PF_KEY, };
  70 struct sockaddr key_src = { 2, PF_KEY, };
  71
  72 static int key_sendup0 (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 == NULL)
  86                 panic("key_output: NULL pointer was passed.");
  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))) == NULL) {
 100                         pfkeystat.out_nomem++;
 101                         error = ENOBUFS;
 102                         goto end;
 103                 }
 104         }
 105
 106         if ((m->m_flags & M_PKTHDR) == 0)
 107                 panic("key_output: not M_PKTHDR ??");
 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         lwkt_gettoken(&key_token);
 121         error = key_parse(m, so);
 122         m = NULL;
 123         lwkt_reltoken(&key_token);
 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(struct rawcb *rp, struct mbuf *m, int promisc)
 135 {
 136         int error;
 137
 138         if (promisc) {
 139                 struct sadb_msg *pmsg;
 140
 141                 M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT);
 142                 if (m && m->m_len < sizeof(struct sadb_msg))
 143                         m = m_pullup(m, sizeof(struct sadb_msg));
 144                 if (!m) {
 145                         pfkeystat.in_nomem++;
 146                         m_freem(m);
 147                         return ENOBUFS;
 148                 }
 149                 m->m_pkthdr.len += sizeof(*pmsg);
 150
 151                 pmsg = mtod(m, struct sadb_msg *);
 152                 bzero(pmsg, sizeof(*pmsg));
 153                 pmsg->sadb_msg_version = PF_KEY_V2;
 154                 pmsg->sadb_msg_type = SADB_X_PROMISC;
 155                 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
 156                 /* pid and seq? */
 157
 158                 pfkeystat.in_msgtype[pmsg->sadb_msg_type]++;
 159         }
 160
 161         lwkt_gettoken(&key_token);
 162         if (!ssb_appendaddr(&rp->rcb_socket->so_rcv, &key_src, m, NULL)) {
 163                 pfkeystat.in_nomem++;
 164                 m_freem(m);
 165                 error = ENOBUFS;
 166         } else {
 167                 error = 0;
 168         }
 169         lwkt_reltoken(&key_token);
 170         sorwakeup(rp->rcb_socket);
 171         return error;
 172 }
 173
 174 /*
 175  * XXX this interface should be obsoleted.
 176  *
 177  * Parameters:
 178  *      target: target of the resulting message
 179  */
 180 int
 181 key_sendup(struct socket *so, struct sadb_msg *msg, u_int len,
 182            int target)
 183 {
 184         struct mbuf *m, *n, *mprev;
 185         int tlen;
 186
 187         /* sanity check */
 188         if (so == NULL || msg == NULL)
 189                 panic("key_sendup: NULL pointer was passed.");
 190
 191         KEYDEBUG(KEYDEBUG_KEY_DUMP,
 192                 kprintf("key_sendup: \n");
 193                 kdebug_sadb(msg));
 194
 195         /*
 196          * we increment statistics here, just in case we have ENOBUFS
 197          * in this function.
 198          */
 199         pfkeystat.in_total++;
 200         pfkeystat.in_bytes += len;
 201         pfkeystat.in_msgtype[msg->sadb_msg_type]++;
 202
 203         /*
 204          * Get mbuf chain whenever possible (not clusters),
 205          * to save socket buffer.  We'll be generating many SADB_ACQUIRE
 206          * messages to listening key sockets.  If we simply allocate clusters,
 207          * ssb_appendaddr() will raise ENOBUFS due to too little ssb_space().
 208          * ssb_space() computes # of actual data bytes AND mbuf region.
 209          *
 210          * TODO: SADB_ACQUIRE filters should be implemented.
 211          */
 212         tlen = len;
 213         m = mprev = NULL;
 214         while (tlen > 0) {
 215                 if (tlen == len) {
 216                         MGETHDR(n, M_NOWAIT, MT_DATA);
 217                         n->m_len = MHLEN;
 218                 } else {
 219                         MGET(n, M_NOWAIT, MT_DATA);
 220                         n->m_len = MLEN;
 221                 }
 222                 if (!n) {
 223                         pfkeystat.in_nomem++;
 224                         return ENOBUFS;
 225                 }
 226                 if (tlen >= MCLBYTES) { /*XXX better threshold? */
 227                         MCLGET(n, M_NOWAIT);
 228                         if ((n->m_flags & M_EXT) == 0) {
 229                                 m_free(n);
 230                                 m_freem(m);
 231                                 pfkeystat.in_nomem++;
 232                                 return ENOBUFS;
 233                         }
 234                         n->m_len = MCLBYTES;
 235                 }
 236
 237                 if (tlen < n->m_len)
 238                         n->m_len = tlen;
 239                 n->m_next = NULL;
 240                 if (m == NULL)
 241                         m = mprev = n;
 242                 else {
 243                         mprev->m_next = n;
 244                         mprev = n;
 245                 }
 246                 tlen -= n->m_len;
 247                 n = NULL;
 248         }
 249         m->m_pkthdr.len = len;
 250         m->m_pkthdr.rcvif = NULL;
 251         m_copyback(m, 0, len, (caddr_t)msg);
 252
 253         /* avoid duplicated statistics */
 254         pfkeystat.in_total--;
 255         pfkeystat.in_bytes -= len;
 256         pfkeystat.in_msgtype[msg->sadb_msg_type]--;
 257
 258         return key_sendup_mbuf(so, m, target);
 259 }
 260
 261 /* so can be NULL if target != KEY_SENDUP_ONE */
 262 int
 263 key_sendup_mbuf(struct socket *so, struct mbuf *m, int target)
 264 {
 265         struct mbuf *n;
 266         struct keycb *kp;
 267         int sendup;
 268         struct rawcb *rp;
 269         int error = 0;
 270
 271         if (m == NULL)
 272                 panic("key_sendup_mbuf: NULL pointer was passed.");
 273         if (so == NULL && target == KEY_SENDUP_ONE)
 274                 panic("key_sendup_mbuf: NULL pointer was passed.");
 275
 276         pfkeystat.in_total++;
 277         pfkeystat.in_bytes += m->m_pkthdr.len;
 278         if (m->m_len < sizeof(struct sadb_msg)) {
 279 #if 1
 280                 m = m_pullup(m, sizeof(struct sadb_msg));
 281                 if (m == NULL) {
 282                         pfkeystat.in_nomem++;
 283                         return ENOBUFS;
 284                 }
 285 #else
 286                 /* don't bother pulling it up just for stats */
 287 #endif
 288         }
 289         if (m->m_len >= sizeof(struct sadb_msg)) {
 290                 struct sadb_msg *msg;
 291                 msg = mtod(m, struct sadb_msg *);
 292                 pfkeystat.in_msgtype[msg->sadb_msg_type]++;
 293         }
 294
 295         lwkt_gettoken(&key_token);
 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                                 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                         lwkt_reltoken(&key_token);
 348                         return ENOBUFS;
 349                 }
 350
 351                 if ((error = key_sendup0(rp, n, 0)) != 0) {
 352                         lwkt_reltoken(&key_token);
 353                         m_freem(m);
 354                         return error;
 355                 }
 356
 357                 n = NULL;
 358         }
 359         lwkt_reltoken(&key_token);
 360
 361         if (so) {
 362                 error = key_sendup0(sotorawcb(so), m, 0);
 363                 m = NULL;
 364         } else {
 365                 error = 0;
 366                 m_freem(m);
 367         }
 368         return error;
 369 }
 370
 371 /*
 372  * key_abort()
 373  * derived from net/rtsock.c:rts_abort()
 374  */
 375 static void
 376 key_abort(netmsg_t msg)
 377 {
 378         lwkt_gettoken(&key_token);
 379
 380         raw_usrreqs.pru_abort(msg);
 381         /* msg invalid now */
 382
 383         lwkt_reltoken(&key_token);
 384 }
 385
 386 /*
 387  * key_attach()
 388  * derived from net/rtsock.c:rts_attach()
 389  */
 390 static void
 391 key_attach(netmsg_t msg)
 392 {
 393         struct socket *so = msg->attach.base.nm_so;
 394         int proto = msg->attach.nm_proto;
 395         struct pru_attach_info *ai = msg->attach.nm_ai;
 396         struct keycb *kp;
 397         struct netmsg_pru_attach smsg;
 398         int error;
 399
 400         if (sotorawcb(so) != NULL) {
 401                 error = EISCONN;        /* XXX panic? */
 402                 goto out;
 403         }
 404
 405         /* XXX */
 406         kp = kmalloc(sizeof *kp, M_PCB, M_WAITOK | M_ZERO);
 407
 408         /*
 409          * The critical section 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 critical section.
 414          */
 415         lwkt_gettoken(&key_token);
 416         so->so_pcb = (caddr_t)kp;
 417         soreference(so);        /* so_pcb assignment */
 418
 419         netmsg_init(&smsg.base, so, &netisr_adone_rport, 0,
 420                     raw_usrreqs.pru_attach);
 421         smsg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE);
 422         smsg.base.lmsg.ms_flags |= MSGF_SYNC;
 423         smsg.nm_proto = proto;
 424         smsg.nm_ai = ai;
 425         raw_usrreqs.pru_attach((netmsg_t)&smsg);
 426         error = smsg.base.lmsg.ms_error;
 427
 428         kp = (struct keycb *)sotorawcb(so);
 429         if (error) {
 430                 kfree(kp, M_PCB);
 431                 atomic_add_int(&so->so_refs, -1);
 432                 so->so_pcb = (caddr_t) 0;
 433                 lwkt_reltoken(&key_token);
 434                 goto out;
 435         }
 436
 437         kp->kp_promisc = kp->kp_registered = 0;
 438
 439         if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
 440                 key_cb.key_count++;
 441         key_cb.any_count++;
 442         kp->kp_raw.rcb_laddr = &key_src;
 443         kp->kp_raw.rcb_faddr = &key_dst;
 444         soisconnected(so);
 445         so->so_options |= SO_USELOOPBACK;
 446
 447         lwkt_reltoken(&key_token);
 448         error = 0;
 449 out:
 450         lwkt_replymsg(&msg->attach.base.lmsg, error);
 451 }
 452
 453 /*
 454  * key_bind()
 455  * derived from net/rtsock.c:rts_bind()
 456  */
 457 static void
 458 key_bind(netmsg_t msg)
 459 {
 460         lwkt_gettoken(&key_token);
 461
 462         raw_usrreqs.pru_bind(msg); /* xxx just EINVAL */
 463         /* msg invalid now */
 464
 465         lwkt_reltoken(&key_token);
 466 }
 467
 468 /*
 469  * key_connect()
 470  * derived from net/rtsock.c:rts_connect()
 471  */
 472 static void
 473 key_connect(netmsg_t msg)
 474 {
 475         lwkt_gettoken(&key_token);
 476
 477         raw_usrreqs.pru_connect(msg); /* XXX just EINVAL */
 478         /* msg invalid now */
 479
 480         lwkt_reltoken(&key_token);
 481 }
 482
 483 /*
 484  * key_detach()
 485  * derived from net/rtsock.c:rts_detach()
 486  */
 487 static void
 488 key_detach(netmsg_t msg)
 489 {
 490         struct socket *so = msg->detach.base.nm_so;
 491         struct keycb *kp = (struct keycb *)sotorawcb(so);
 492
 493         lwkt_gettoken(&key_token);
 494
 495         if (kp != NULL) {
 496                 if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) {
 497                         /* XXX: AF_KEY */
 498                         key_cb.key_count--;
 499                 }
 500                 key_cb.any_count--;
 501
 502                 key_freereg(so);
 503         }
 504         raw_usrreqs.pru_detach(msg);
 505         /* msg invalid now */
 506
 507         lwkt_reltoken(&key_token);
 508 }
 509
 510 /*
 511  * key_disconnect()
 512  * derived from net/rtsock.c:key_disconnect()
 513  */
 514 static void
 515 key_disconnect(netmsg_t msg)
 516 {
 517         lwkt_gettoken(&key_token);
 518
 519         raw_usrreqs.pru_disconnect(msg);
 520         /* msg invalid now */
 521
 522         lwkt_reltoken(&key_token);
 523 }
 524
 525 /*
 526  * key_peeraddr()
 527  * derived from net/rtsock.c:rts_peeraddr()
 528  */
 529 static void
 530 key_peeraddr(netmsg_t msg)
 531 {
 532         lwkt_gettoken(&key_token);
 533
 534         raw_usrreqs.pru_peeraddr(msg);
 535         /* msg invalid now */
 536
 537         lwkt_reltoken(&key_token);
 538 }
 539
 540 /*
 541  * key_send()
 542  * derived from net/rtsock.c:rts_send()
 543  */
 544 static void
 545 key_send(netmsg_t msg)
 546 {
 547         lwkt_gettoken(&key_token);
 548
 549         raw_usrreqs.pru_send(msg);
 550         /* msg invalid now */
 551
 552         lwkt_reltoken(&key_token);
 553 }
 554
 555 /*
 556  * key_shutdown()
 557  * derived from net/rtsock.c:rts_shutdown()
 558  */
 559 static void
 560 key_shutdown(netmsg_t msg)
 561 {
 562         lwkt_gettoken(&key_token);
 563
 564         raw_usrreqs.pru_shutdown(msg);
 565         /* msg invalid now */
 566
 567         lwkt_reltoken(&key_token);
 568 }
 569
 570 /*
 571  * key_sockaddr()
 572  * derived from net/rtsock.c:rts_sockaddr()
 573  */
 574 static void
 575 key_sockaddr(netmsg_t msg)
 576 {
 577         lwkt_gettoken(&key_token);
 578
 579         raw_usrreqs.pru_sockaddr(msg);
 580         /* msg invalid now */
 581
 582         lwkt_reltoken(&key_token);
 583 }
 584
 585 struct pr_usrreqs key_usrreqs = {
 586         .pru_abort = key_abort,
 587         .pru_accept = pr_generic_notsupp,
 588         .pru_attach = key_attach,
 589         .pru_bind = key_bind,
 590         .pru_connect = key_connect,
 591         .pru_connect2 = pr_generic_notsupp,
 592         .pru_control = pr_generic_notsupp,
 593         .pru_detach = key_detach,
 594         .pru_disconnect = key_disconnect,
 595         .pru_listen = pr_generic_notsupp,
 596         .pru_peeraddr = key_peeraddr,
 597         .pru_rcvd =  pr_generic_notsupp,
 598         .pru_rcvoob = pr_generic_notsupp,
 599         .pru_send = key_send,
 600         .pru_sense = pru_sense_null,
 601         .pru_shutdown = key_shutdown,
 602         .pru_sockaddr = key_sockaddr,
 603         .pru_sosend = sosend,
 604         .pru_soreceive = soreceive
 605 };
 606
 607 /* sysctl */
 608 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
 609
 610 /*
 611  * Definitions of protocols supported in the KEY domain.
 612  */
 613
 614 extern struct domain keydomain;
 615
 616 struct protosw keysw[] = {
 617     {
 618         .pr_type = SOCK_RAW,
 619         .pr_domain = &keydomain,
 620         .pr_protocol = PF_KEY_V2,
 621         .pr_flags = PR_ATOMIC|PR_ADDR,
 622
 623         .pr_input = NULL,
 624         .pr_output = key_output,
 625         .pr_ctlinput = raw_ctlinput,
 626         .pr_ctloutput = NULL,
 627
 628         .pr_ctlport = cpu0_ctlport,
 629         .pr_init = raw_init,
 630         .pr_usrreqs = &key_usrreqs
 631     }
 632 };
 633
 634 struct domain keydomain = {
 635         PF_KEY, "key", key_init, NULL, NULL,
 636         keysw, &keysw[NELEM(keysw)],
 637 };
 638
 639 DOMAIN_SET(key);