sys/contrib/ipfilter/netinet/ip_auth.c

   1 /*
   2  * Copyright (C) 1998-2001 by Darren Reed & Guido van Rooij.
   3  *
   4  * See the IPFILTER.LICENCE file for details on licencing.
   5  *
   6  * @(#)$Id: ip_auth.c,v 2.11.2.20 2002/06/04 14:40:42 darrenr Exp $
   7  * $FreeBSD: src/sys/contrib/ipfilter/netinet/ip_auth.c,v 1.21.2.7 2003/03/01 03:55:54 darrenr Exp $
   8  * $DragonFly: src/sys/contrib/ipfilter/netinet/ip_auth.c,v 1.8 2005/06/05 12:17:46 corecode Exp $
   9  */
  10 #if defined(__sgi) && (IRIX > 602)
  11 # include <sys/ptimers.h>
  12 #endif
  13 #include <sys/errno.h>
  14 #include <sys/types.h>
  15 #include <sys/param.h>
  16 #include <sys/time.h>
  17 #include <sys/file.h>
  18 #if !defined(_KERNEL) && !defined(KERNEL)
  19 # include <stdio.h>
  20 # include <stdlib.h>
  21 # include <string.h>
  22 #endif
  23 #if (defined(KERNEL) || defined(_KERNEL)) && (defined(__DragonFly__) || __FreeBSD_version >= 220000)
  24 # include <sys/filio.h>
  25 # include <sys/fcntl.h>
  26 #else
  27 # include <sys/ioctl.h>
  28 #endif
  29 #ifndef linux
  30 # include <sys/protosw.h>
  31 #endif
  32 #include <sys/socket.h>
  33 #if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux)
  34 # include <sys/systm.h>
  35 #endif
  36 #if !defined(__SVR4) && !defined(__svr4__)
  37 # ifndef linux
  38 #  include <sys/mbuf.h>
  39 # endif
  40 #else
  41 # include <sys/filio.h>
  42 # include <sys/byteorder.h>
  43 # ifdef _KERNEL
  44 #  include <sys/dditypes.h>
  45 # endif
  46 # include <sys/stream.h>
  47 # include <sys/kmem.h>
  48 #endif
  49 #if defined(__DragonFly__) || (_BSDI_VERSION >= 199802) || (__FreeBSD_version >= 400000)
  50 # include <sys/queue.h>
  51 #endif
  52 #if defined(__DragonFly__) && defined(_KERNEL)
  53 # include <sys/thread2.h>
  54 #endif
  55 #if defined(__NetBSD__) || defined(__OpenBSD__) || defined(bsdi)
  56 # include <machine/cpu.h>
  57 #endif
  58 #include <net/if.h>
  59 #ifdef sun
  60 # include <net/af.h>
  61 #endif
  62 #include <net/route.h>
  63 #include <netinet/in.h>
  64 #include <netinet/in_systm.h>
  65 #include <netinet/ip.h>
  66 #ifndef KERNEL
  67 # define        KERNEL
  68 # define        NOT_KERNEL
  69 #endif
  70 #ifndef linux
  71 # include <netinet/ip_var.h>
  72 #endif
  73 #ifdef  NOT_KERNEL
  74 # undef KERNEL
  75 #endif
  76 #ifdef __sgi
  77 # ifdef IFF_DRVRLOCK /* IRIX6 */
  78 #  include <sys/hashing.h>
  79 # endif
  80 #endif
  81 #include <netinet/tcp.h>
  82 #if defined(__sgi) && !defined(IFF_DRVRLOCK) /* IRIX < 6 */
  83 extern struct ifqueue   ipintrq;                /* ip packet input queue */
  84 #else
  85 # ifndef linux
  86 #  if defined(__DragonFly__) || __FreeBSD_version >= 300000
  87 #   include <net/if_var.h>
  88 #  endif
  89 #  include <netinet/in_var.h>
  90 #  include <netinet/tcp_fsm.h>
  91 # endif
  92 #endif
  93 #include <netinet/udp.h>
  94 #include <netinet/ip_icmp.h>
  95 #include "ip_compat.h"
  96 #include <netinet/tcpip.h>
  97 #include "ip_fil.h"
  98 #include "ip_auth.h"
  99 #if !SOLARIS && !defined(linux)
 100 # include <net/netisr.h>
 101 # if defined(__DragonFly__) || defined(__FreeBSD__)
 102 #  include <machine/cpufunc.h>
 103 # endif
 104 #endif
 105 #if defined(__DragonFly__) || (__FreeBSD_version >= 300000)
 106 # include <sys/malloc.h>
 107 # if (defined(_KERNEL) || defined(KERNEL)) && !defined(IPFILTER_LKM)
 108 #  include <sys/libkern.h>
 109 #  include <sys/systm.h>
 110 # endif
 111 #endif
 112
 113 #if (SOLARIS || defined(__sgi)) && defined(_KERNEL)
 114 extern KRWLOCK_T ipf_auth, ipf_mutex;
 115 extern kmutex_t ipf_authmx;
 116 # if SOLARIS
 117 extern kcondvar_t ipfauthwait;
 118 # endif
 119 #endif
 120 #ifdef linux
 121 static struct wait_queue *ipfauthwait = NULL;
 122 #endif
 123
 124 int     fr_authsize = FR_NUMAUTH;
 125 int     fr_authused = 0;
 126 int     fr_defaultauthage = 600;
 127 int     fr_auth_lock = 0;
 128 fr_authstat_t   fr_authstats;
 129 static frauth_t fr_auth[FR_NUMAUTH];
 130 mb_t    *fr_authpkts[FR_NUMAUTH];
 131 static int      fr_authstart = 0, fr_authend = 0, fr_authnext = 0;
 132 static frauthent_t      *fae_list = NULL;
 133 frentry_t       *ipauth = NULL,
 134                 *fr_authlist = NULL;
 135
 136
 137 /*
 138  * Check if a packet has authorization.  If the packet is found to match an
 139  * authorization result and that would result in a feedback loop (i.e. it
 140  * will end up returning FR_AUTH) then return FR_BLOCK instead.
 141  */
 142 u_32_t fr_checkauth(ip, fin)
 143 ip_t *ip;
 144 fr_info_t *fin;
 145 {
 146         u_short id = ip->ip_id;
 147         frentry_t *fr;
 148         frauth_t *fra;
 149         u_32_t pass;
 150         int i;
 151
 152         if (fr_auth_lock || !fr_authused)
 153                 return 0;
 154
 155         READ_ENTER(&ipf_auth);
 156         for (i = fr_authstart; i != fr_authend; ) {
 157                 /*
 158                  * index becomes -2 only after an SIOCAUTHW.  Check this in
 159                  * case the same packet gets sent again and it hasn't yet been
 160                  * auth'd.
 161                  */
 162                 fra = fr_auth + i;
 163                 if ((fra->fra_index == -2) && (id == fra->fra_info.fin_id) &&
 164                     !bcmp((char *)fin, (char *)&fra->fra_info, FI_CSIZE)) {
 165                         /*
 166                          * Avoid feedback loop.
 167                          */
 168                         if (!(pass = fra->fra_pass) || (pass & FR_AUTH))
 169                                 pass = FR_BLOCK;
 170                         /*
 171                          * Create a dummy rule for the stateful checking to
 172                          * use and return.  Zero out any values we don't
 173                          * trust from userland!
 174                          */
 175                         if ((pass & FR_KEEPSTATE) || ((pass & FR_KEEPFRAG) &&
 176                              (fin->fin_fi.fi_fl & FI_FRAG))) {
 177                                 KMALLOC(fr, frentry_t *);
 178                                 if (fr) {
 179                                         bcopy((char *)fra->fra_info.fin_fr,
 180                                               fr, sizeof(*fr));
 181                                         fr->fr_grp = NULL;
 182                                         fr->fr_ifa = fin->fin_ifp;
 183                                         fr->fr_func = NULL;
 184                                         fr->fr_ref = 1;
 185                                         fr->fr_flags = pass;
 186 #if BSD >= 199306
 187                                         fr->fr_oifa = NULL;
 188 #endif
 189                                 }
 190                         } else
 191                                 fr = fra->fra_info.fin_fr;
 192                         fin->fin_fr = fr;
 193                         RWLOCK_EXIT(&ipf_auth);
 194                         WRITE_ENTER(&ipf_auth);
 195                         if (fr && fr != fra->fra_info.fin_fr) {
 196                                 fr->fr_next = fr_authlist;
 197                                 fr_authlist = fr;
 198                         }
 199                         fr_authstats.fas_hits++;
 200                         fra->fra_index = -1;
 201                         fr_authused--;
 202                         if (i == fr_authstart) {
 203                                 while (fra->fra_index == -1) {
 204                                         i++;
 205                                         fra++;
 206                                         if (i == FR_NUMAUTH) {
 207                                                 i = 0;
 208                                                 fra = fr_auth;
 209                                         }
 210                                         fr_authstart = i;
 211                                         if (i == fr_authend)
 212                                                 break;
 213                                 }
 214                                 if (fr_authstart == fr_authend) {
 215                                         fr_authnext = 0;
 216                                         fr_authstart = fr_authend = 0;
 217                                 }
 218                         }
 219                         RWLOCK_EXIT(&ipf_auth);
 220                         return pass;
 221                 }
 222                 i++;
 223                 if (i == FR_NUMAUTH)
 224                         i = 0;
 225         }
 226         fr_authstats.fas_miss++;
 227         RWLOCK_EXIT(&ipf_auth);
 228         return 0;
 229 }
 230
 231
 232 /*
 233  * Check if we have room in the auth array to hold details for another packet.
 234  * If we do, store it and wake up any user programs which are waiting to
 235  * hear about these events.
 236  */
 237 int fr_newauth(m, fin, ip)
 238 mb_t *m;
 239 fr_info_t *fin;
 240 ip_t *ip;
 241 {
 242 #if defined(_KERNEL) && SOLARIS
 243         qif_t *qif = fin->fin_qif;
 244 #endif
 245         frauth_t *fra;
 246         int i;
 247
 248         if (fr_auth_lock)
 249                 return 0;
 250
 251         WRITE_ENTER(&ipf_auth);
 252         if (fr_authstart > fr_authend) {
 253                 fr_authstats.fas_nospace++;
 254                 RWLOCK_EXIT(&ipf_auth);
 255                 return 0;
 256         } else {
 257                 if (fr_authused == FR_NUMAUTH) {
 258                         fr_authstats.fas_nospace++;
 259                         RWLOCK_EXIT(&ipf_auth);
 260                         return 0;
 261                 }
 262         }
 263
 264         fr_authstats.fas_added++;
 265         fr_authused++;
 266         i = fr_authend++;
 267         if (fr_authend == FR_NUMAUTH)
 268                 fr_authend = 0;
 269         RWLOCK_EXIT(&ipf_auth);
 270         fra = fr_auth + i;
 271         fra->fra_index = i;
 272         fra->fra_pass = 0;
 273         fra->fra_age = fr_defaultauthage;
 274         bcopy((char *)fin, (char *)&fra->fra_info, sizeof(*fin));
 275 #if SOLARIS && defined(_KERNEL)
 276 # if !defined(sparc)
 277         /*
 278          * No need to copyback here as we want to undo the changes, not keep
 279          * them.
 280          */
 281         if ((ip == (ip_t *)m->b_rptr) && (ip->ip_v == 4))
 282         {
 283                 u_short bo;
 284
 285                 bo = ip->ip_len;
 286                 ip->ip_len = htons(bo);
 287                 bo = ip->ip_off;
 288                 ip->ip_off = htons(bo);
 289         }
 290 # endif
 291         m->b_rptr -= qif->qf_off;
 292         fr_authpkts[i] = *(mblk_t **)fin->fin_mp;
 293         fra->fra_q = qif->qf_q;
 294         cv_signal(&ipfauthwait);
 295 #else
 296 # if defined(BSD) && !defined(sparc) && (BSD >= 199306)
 297         if (fin->fin_out == 0) {
 298                 ip->ip_len = htons(ip->ip_len);
 299                 ip->ip_off = htons(ip->ip_off);
 300         }
 301 # endif
 302         fr_authpkts[i] = m;
 303         WAKEUP(&fr_authnext);
 304 #endif
 305         return 1;
 306 }
 307
 308
 309 int fr_auth_ioctl(data, mode, cmd)
 310 caddr_t data;
 311 int mode;
 312 #if defined(__DragonFly__) || defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
 313 u_long cmd;
 314 #else
 315 int cmd;
 316 #endif
 317 {
 318         mb_t *m;
 319 #if defined(_KERNEL) && !SOLARIS
 320 #if !defined(__DragonFly__) && !defined(__FreeBSD__)
 321         struct ifqueue *ifq;
 322 #endif
 323 #if !defined(__DragonFly__)
 324         int s;
 325 #endif
 326 #endif
 327         frauth_t auth, *au = &auth, *fra;
 328         int i, error = 0;
 329
 330         switch (cmd)
 331         {
 332         case SIOCSTLCK :
 333                 if (!(mode & FWRITE)) {
 334                         error = EPERM;
 335                         break;
 336                 }
 337                 error = fr_lock(data, &fr_auth_lock);
 338                 break;
 339         case SIOCINIFR :
 340         case SIOCRMIFR :
 341         case SIOCADIFR :
 342                 error = EINVAL;
 343                 break;
 344         case SIOCINAFR :
 345                 error = EINVAL;
 346                 break;
 347         case SIOCRMAFR :
 348         case SIOCADAFR :
 349                 /* These commands go via request to fr_preauthcmd */
 350                 error = EINVAL;
 351                 break;
 352         case SIOCATHST:
 353                 fr_authstats.fas_faelist = fae_list;
 354                 error = IWCOPYPTR((char *)&fr_authstats, data,
 355                                    sizeof(fr_authstats));
 356                 break;
 357         case SIOCAUTHW:
 358                 if (!(mode & FWRITE)) {
 359                         error = EPERM;
 360                         break;
 361                 }
 362 fr_authioctlloop:
 363                 READ_ENTER(&ipf_auth);
 364                 if ((fr_authnext != fr_authend) && fr_authpkts[fr_authnext]) {
 365                         error = IWCOPYPTR((char *)&fr_auth[fr_authnext], data,
 366                                           sizeof(frauth_t));
 367                         RWLOCK_EXIT(&ipf_auth);
 368                         if (error)
 369                                 break;
 370                         WRITE_ENTER(&ipf_auth);
 371                         SPL_NET(s);
 372                         fr_authnext++;
 373                         if (fr_authnext == FR_NUMAUTH)
 374                                 fr_authnext = 0;
 375                         SPL_X(s);
 376                         RWLOCK_EXIT(&ipf_auth);
 377                         return 0;
 378                 }
 379                 RWLOCK_EXIT(&ipf_auth);
 380 #ifdef  _KERNEL
 381 # if    SOLARIS
 382                 mutex_enter(&ipf_authmx);
 383                 if (!cv_wait_sig(&ipfauthwait, &ipf_authmx)) {
 384                         mutex_exit(&ipf_authmx);
 385                         return EINTR;
 386                 }
 387                 mutex_exit(&ipf_authmx);
 388 # else
 389                 error = SLEEP(&fr_authnext, "fr_authnext");
 390 # endif
 391 #endif
 392                 if (!error)
 393                         goto fr_authioctlloop;
 394                 break;
 395         case SIOCAUTHR:
 396                 if (!(mode & FWRITE)) {
 397                         error = EPERM;
 398                         break;
 399                 }
 400                 error = IRCOPYPTR(data, (caddr_t)&auth, sizeof(auth));
 401                 if (error)
 402                         return error;
 403                 WRITE_ENTER(&ipf_auth);
 404                 SPL_NET(s);
 405                 i = au->fra_index;
 406                 fra = fr_auth + i;
 407                 if ((i < 0) || (i > FR_NUMAUTH) ||
 408                     (fra->fra_info.fin_id != au->fra_info.fin_id)) {
 409                         SPL_X(s);
 410                         RWLOCK_EXIT(&ipf_auth);
 411                         return EINVAL;
 412                 }
 413                 m = fr_authpkts[i];
 414                 fra->fra_index = -2;
 415                 fra->fra_pass = au->fra_pass;
 416                 fr_authpkts[i] = NULL;
 417                 RWLOCK_EXIT(&ipf_auth);
 418 #ifdef  _KERNEL
 419                 if (m && au->fra_info.fin_out) {
 420 # if SOLARIS
 421                         error = (fr_qout(fra->fra_q, m) == 0) ? EINVAL : 0;
 422 # else /* SOLARIS */
 423                         struct route ro;
 424
 425                         bzero((char *)&ro, sizeof(ro));
 426 #  if ((_BSDI_VERSION >= 199802) && (_BSDI_VERSION < 200005)) || \
 427        defined(__DragonFly__) || defined(__OpenBSD__) || (defined(IRIX) && (IRIX >= 605)) || \
 428        (__FreeBSD_version >= 470102)
 429                         error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL,
 430                                           NULL);
 431 #  else
 432                         error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL);
 433 #  endif
 434                         if (ro.ro_rt) {
 435                                 RTFREE(ro.ro_rt);
 436                         }
 437 # endif /* SOLARIS */
 438                         if (error)
 439                                 fr_authstats.fas_sendfail++;
 440                         else
 441                                 fr_authstats.fas_sendok++;
 442                 } else if (m) {
 443 # if SOLARIS
 444                         error = (fr_qin(fra->fra_q, m) == 0) ? EINVAL : 0;
 445 # else /* SOLARIS */
 446 # if defined(__DragonFly__) || defined(__FreeBSD__)
 447                         error = netisr_queue(NETISR_IP, m);
 448 # else
 449                         ifq = &ipintrq;
 450                         if (IF_QFULL(ifq)) {
 451                                 IF_DROP(ifq);
 452                                 m_freem(m);
 453                                 error = ENOBUFS;
 454                         } else {
 455                                 IF_ENQUEUE(ifq, m);
 456 #  if IRIX < 605
 457                                 schednetisr(NETISR_IP);
 458 #  endif
 459                         }
 460 # endif
 461 # endif /* !SOLARIS */
 462                         if (error)
 463                                 fr_authstats.fas_quefail++;
 464                         else
 465                                 fr_authstats.fas_queok++;
 466                 } else
 467                         error = EINVAL;
 468 # if SOLARIS
 469                 if (error)
 470                         error = EINVAL;
 471 # else
 472                 /*
 473                  * If we experience an error which will result in the packet
 474                  * not being processed, make sure we advance to the next one.
 475                  */
 476                 if (error == ENOBUFS) {
 477                         fr_authused--;
 478                         fra->fra_index = -1;
 479                         fra->fra_pass = 0;
 480                         if (i == fr_authstart) {
 481                                 while (fra->fra_index == -1) {
 482                                         i++;
 483                                         if (i == FR_NUMAUTH)
 484                                                 i = 0;
 485                                         fr_authstart = i;
 486                                         if (i == fr_authend)
 487                                                 break;
 488                                 }
 489                                 if (fr_authstart == fr_authend) {
 490                                         fr_authnext = 0;
 491                                         fr_authstart = fr_authend = 0;
 492                                 }
 493                         }
 494                 }
 495 # endif
 496 #endif /* _KERNEL */
 497                 SPL_X(s);
 498                 break;
 499         default :
 500                 error = EINVAL;
 501                 break;
 502         }
 503         return error;
 504 }
 505
 506
 507 /*
 508  * Free all network buffer memory used to keep saved packets.
 509  */
 510 void fr_authunload()
 511 {
 512         int i;
 513         frauthent_t *fae, **faep;
 514         frentry_t *fr, **frp;
 515         mb_t *m;
 516
 517         WRITE_ENTER(&ipf_auth);
 518         for (i = 0; i < FR_NUMAUTH; i++) {
 519                 if ((m = fr_authpkts[i])) {
 520                         FREE_MB_T(m);
 521                         fr_authpkts[i] = NULL;
 522                         fr_auth[i].fra_index = -1;
 523                 }
 524         }
 525
 526
 527         for (faep = &fae_list; (fae = *faep); ) {
 528                 *faep = fae->fae_next;
 529                 KFREE(fae);
 530         }
 531         ipauth = NULL;
 532         RWLOCK_EXIT(&ipf_auth);
 533
 534         if (fr_authlist) {
 535                 /*
 536                  * We *MuST* reget ipf_auth because otherwise we won't get the
 537                  * locks in the right order and risk deadlock.
 538                  * We need ipf_mutex here to prevent a rule from using it
 539                  * inside fr_check().
 540                  */
 541                 WRITE_ENTER(&ipf_mutex);
 542                 WRITE_ENTER(&ipf_auth);
 543                 for (frp = &fr_authlist; (fr = *frp); ) {
 544                         if (fr->fr_ref == 1) {
 545                                 *frp = fr->fr_next;
 546                                 KFREE(fr);
 547                         } else
 548                                 frp = &fr->fr_next;
 549                 }
 550                 RWLOCK_EXIT(&ipf_auth);
 551                 RWLOCK_EXIT(&ipf_mutex);
 552         }
 553 }
 554
 555
 556 /*
 557  * Slowly expire held auth records.  Timeouts are set
 558  * in expectation of this being called twice per second.
 559  */
 560 void fr_authexpire()
 561 {
 562         int i;
 563         frauth_t *fra;
 564         frauthent_t *fae, **faep;
 565         frentry_t *fr, **frp;
 566         mb_t *m;
 567 #if !SOLARIS && defined(_KERNEL) && !defined(__DragonFly__)
 568         int s;
 569 #endif
 570
 571         if (fr_auth_lock)
 572                 return;
 573
 574         SPL_NET(s);
 575         WRITE_ENTER(&ipf_auth);
 576         for (i = 0, fra = fr_auth; i < FR_NUMAUTH; i++, fra++) {
 577                 if ((!--fra->fra_age) && (m = fr_authpkts[i])) {
 578                         FREE_MB_T(m);
 579                         fr_authpkts[i] = NULL;
 580                         fr_auth[i].fra_index = -1;
 581                         fr_authstats.fas_expire++;
 582                         fr_authused--;
 583                 }
 584         }
 585
 586         for (faep = &fae_list; (fae = *faep); ) {
 587                 if (!--fae->fae_age) {
 588                         *faep = fae->fae_next;
 589                         KFREE(fae);
 590                         fr_authstats.fas_expire++;
 591                 } else
 592                         faep = &fae->fae_next;
 593         }
 594         if (fae_list != NULL)
 595                 ipauth = &fae_list->fae_fr;
 596         else
 597                 ipauth = NULL;
 598
 599         for (frp = &fr_authlist; (fr = *frp); ) {
 600                 if (fr->fr_ref == 1) {
 601                         *frp = fr->fr_next;
 602                         KFREE(fr);
 603                 } else
 604                         frp = &fr->fr_next;
 605         }
 606         RWLOCK_EXIT(&ipf_auth);
 607         SPL_X(s);
 608 }
 609
 610 int fr_preauthcmd(cmd, fr, frptr)
 611 #if defined(__DragonFly__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
 612         (_BSDI_VERSION >= 199701) || (__FreeBSD_version >= 300000)
 613 u_long cmd;
 614 #else
 615 int cmd;
 616 #endif
 617 frentry_t *fr, **frptr;
 618 {
 619         frauthent_t *fae, **faep;
 620         int error = 0;
 621 #if defined(KERNEL) && !SOLARIS && !defined(__DragonFly__)
 622         int s;
 623 #endif
 624
 625         if ((cmd != SIOCADAFR) && (cmd != SIOCRMAFR)) {
 626                 /* Should not happen */
 627                 printf("fr_preauthcmd called with bad cmd 0x%lx", (u_long)cmd);
 628                 return EIO;
 629         }
 630
 631         for (faep = &fae_list; (fae = *faep); )
 632                 if (&fae->fae_fr == fr)
 633                         break;
 634                 else
 635                         faep = &fae->fae_next;
 636         if (cmd == SIOCRMAFR) {
 637                 if (!fr || !frptr)
 638                         error = EINVAL;
 639                 else if (!fae)
 640                         error = ESRCH;
 641                 else {
 642                         WRITE_ENTER(&ipf_auth);
 643                         SPL_NET(s);
 644                         *faep = fae->fae_next;
 645                         *frptr = fr->fr_next;
 646                         SPL_X(s);
 647                         RWLOCK_EXIT(&ipf_auth);
 648                         KFREE(fae);
 649                 }
 650         } else if (fr && frptr) {
 651                 KMALLOC(fae, frauthent_t *);
 652                 if (fae != NULL) {
 653                         bcopy((char *)fr, (char *)&fae->fae_fr,
 654                               sizeof(*fr));
 655                         WRITE_ENTER(&ipf_auth);
 656                         SPL_NET(s);
 657                         fae->fae_age = fr_defaultauthage;
 658                         fae->fae_fr.fr_hits = 0;
 659                         fae->fae_fr.fr_next = *frptr;
 660                         *frptr = &fae->fae_fr;
 661                         fae->fae_next = *faep;
 662                         *faep = fae;
 663                         ipauth = &fae_list->fae_fr;
 664                         SPL_X(s);
 665                         RWLOCK_EXIT(&ipf_auth);
 666                 } else
 667                         error = ENOMEM;
 668         } else
 669                 error = EINVAL;
 670         return error;
 671 }