linux/net/ipsec/ipsec_init.c

   1 /*
   2  * @(#) Initialization code.
   3  * Copyright (C) 1996, 1997  John Ioannidis.
   4  * Copyright (C) 1998, 1999, 2000, 2001, 2002  Richard Guy Briggs <rgb@freeswan.org>
   5  *                                 2001  Michael Richardson <mcr@freeswan.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * for more details.
  16  *
  17  * /proc system code was split out into ipsec_proc.c after rev. 1.70.
  18  *
  19  */
  20
  21 char ipsec_init_c_version[] = "RCSID $Id: ipsec_init.c,v 1.3 2004/06/13 19:57:49 as Exp $";
  22
  23 #include <linux/config.h>
  24 #include <linux/version.h>
  25 #include <linux/module.h>
  26 #include <linux/kernel.h> /* printk() */
  27
  28 #include "freeswan/ipsec_param.h"
  29
  30 #ifdef MALLOC_SLAB
  31 # include <linux/slab.h> /* kmalloc() */
  32 #else /* MALLOC_SLAB */
  33 # include <linux/malloc.h> /* kmalloc() */
  34 #endif /* MALLOC_SLAB */
  35 #include <linux/errno.h>  /* error codes */
  36 #include <linux/types.h>  /* size_t */
  37 #include <linux/interrupt.h> /* mark_bh */
  38
  39 #include <linux/netdevice.h>   /* struct device, and other headers */
  40 #include <linux/etherdevice.h> /* eth_type_trans */
  41 #include <linux/ip.h>          /* struct iphdr */
  42 #include <linux/in.h>          /* struct sockaddr_in */
  43 #include <linux/skbuff.h>
  44 #include <linux/random.h>       /* get_random_bytes() */
  45 #include <freeswan.h>
  46
  47 #ifdef SPINLOCK
  48 # ifdef SPINLOCK_23
  49 #  include <linux/spinlock.h> /* *lock* */
  50 # else /* 23_SPINLOCK */
  51 #  include <asm/spinlock.h> /* *lock* */
  52 # endif /* 23_SPINLOCK */
  53 #endif /* SPINLOCK */
  54
  55 #ifdef NET_21
  56 # include <asm/uaccess.h>
  57 # include <linux/in6.h>
  58 #endif /* NET_21 */
  59
  60 #include <asm/checksum.h>
  61 #include <net/ip.h>
  62
  63 #ifdef CONFIG_PROC_FS
  64 # include <linux/proc_fs.h>
  65 #endif /* CONFIG_PROC_FS */
  66
  67 #ifdef NETLINK_SOCK
  68 # include <linux/netlink.h>
  69 #else
  70 # include <net/netlink.h>
  71 #endif
  72
  73 #include "freeswan/radij.h"
  74
  75 #include "freeswan/ipsec_life.h"
  76 #include "freeswan/ipsec_stats.h"
  77 #include "freeswan/ipsec_sa.h"
  78
  79 #include "freeswan/ipsec_encap.h"
  80 #include "freeswan/ipsec_radij.h"
  81 #include "freeswan/ipsec_xform.h"
  82 #include "freeswan/ipsec_tunnel.h"
  83
  84 #include "freeswan/ipsec_rcv.h"
  85 #include "freeswan/ipsec_ah.h"
  86 #include "freeswan/ipsec_esp.h"
  87
  88 #ifdef CONFIG_IPSEC_IPCOMP
  89 # include "freeswan/ipcomp.h"
  90 #endif /* CONFIG_IPSEC_IPCOMP */
  91
  92 #include "freeswan/ipsec_proto.h"
  93 #include "freeswan/ipsec_alg.h"
  94
  95 #include <pfkeyv2.h>
  96 #include <pfkey.h>
  97
  98 #if !defined(CONFIG_IPSEC_ESP) && !defined(CONFIG_IPSEC_AH)
  99 #error "kernel configuration must include ESP or AH"
 100 #endif
 101
 102 /*
 103  * seems to be present in 2.4.10 (Linus), but also in some RH and other
 104  * distro kernels of a lower number.
 105  */
 106 #ifdef MODULE_LICENSE
 107 MODULE_LICENSE("GPL");
 108 #endif
 109
 110 #ifdef CONFIG_IPSEC_DEBUG
 111 int debug_eroute = 0;
 112 int debug_spi = 0;
 113 int debug_netlink = 0;
 114 #endif /* CONFIG_IPSEC_DEBUG */
 115
 116 struct prng ipsec_prng;
 117
 118 extern int ipsec_device_event(struct notifier_block *dnot, unsigned long event, void *ptr);
 119 /*
 120  * the following structure is required so that we receive
 121  * event notifications when network devices are enabled and
 122  * disabled (ifconfig up and down).
 123  */
 124 static struct notifier_block ipsec_dev_notifier={
 125         ipsec_device_event,
 126         NULL,
 127         0
 128 };
 129
 130 #ifdef CONFIG_SYSCTL
 131 extern int ipsec_sysctl_register(void);
 132 extern void ipsec_sysctl_unregister(void);
 133 #endif
 134
 135 static inline int
 136 freeswan_inet_add_protocol(struct inet_protocol *prot, unsigned protocol)
 137 {
 138 #ifdef NETDEV_25
 139         return inet_add_protocol(prot, protocol);
 140 #else
 141         inet_add_protocol(prot);
 142         return 0;
 143 #endif
 144 }
 145
 146 static inline int
 147 freeswan_inet_del_protocol(struct inet_protocol *prot, unsigned protocol)
 148 {
 149 #ifdef NETDEV_25
 150         return inet_del_protocol(prot, protocol);
 151 #else
 152         inet_del_protocol(prot);
 153         return 0;
 154 #endif
 155 }
 156
 157 /* void */
 158 int
 159 ipsec_init(void)
 160 {
 161         int error = 0;
 162         unsigned char seed[256];
 163 #ifdef CONFIG_IPSEC_ENC_3DES
 164         extern int des_check_key;
 165
 166         /* turn off checking of keys */
 167         des_check_key=0;
 168 #endif /* CONFIG_IPSEC_ENC_3DES */
 169
 170         KLIPS_PRINT(1, "klips_info:ipsec_init: "
 171                     "KLIPS startup, FreeS/WAN IPSec version: %s\n",
 172                     ipsec_version_code());
 173
 174         error |= ipsec_proc_init();
 175
 176 #ifdef SPINLOCK
 177         ipsec_sadb.sadb_lock = SPIN_LOCK_UNLOCKED;
 178 #else /* SPINLOCK */
 179         ipsec_sadb.sadb_lock = 0;
 180 #endif /* SPINLOCK */
 181
 182 #ifndef SPINLOCK
 183         tdb_lock.lock = 0;
 184         eroute_lock.lock = 0;
 185 #endif /* !SPINLOCK */
 186
 187         error |= ipsec_sadb_init();
 188         error |= ipsec_radijinit();
 189
 190         error |= pfkey_init();
 191
 192         error |= register_netdevice_notifier(&ipsec_dev_notifier);
 193
 194 #ifdef CONFIG_IPSEC_ESP
 195         freeswan_inet_add_protocol(&esp_protocol, IPPROTO_ESP);
 196 #endif /* CONFIG_IPSEC_ESP */
 197
 198 #ifdef CONFIG_IPSEC_AH
 199         freeswan_inet_add_protocol(&ah_protocol, IPPROTO_AH);
 200 #endif /* CONFIG_IPSEC_AH */
 201
 202 /* we never actually link IPCOMP to the stack */
 203 #ifdef IPCOMP_USED_ALONE
 204 #ifdef CONFIG_IPSEC_IPCOMP
 205         freeswan_inet_add_protocol(&comp_protocol, IPPROTO_COMP);
 206 #endif /* CONFIG_IPSEC_IPCOMP */
 207 #endif
 208
 209         error |= ipsec_tunnel_init_devices();
 210
 211
 212 #ifdef CONFIG_SYSCTL
 213         error |= ipsec_sysctl_register();
 214 #endif
 215
 216 #ifdef CONFIG_IPSEC_ALG
 217         ipsec_alg_init();
 218 #endif
 219
 220         get_random_bytes((void *)seed, sizeof(seed));
 221         prng_init(&ipsec_prng, seed, sizeof(seed));
 222
 223         return error;
 224 }
 225
 226
 227 /* void */
 228 int
 229 ipsec_cleanup(void)
 230 {
 231         int error = 0;
 232
 233 #ifdef CONFIG_SYSCTL
 234         ipsec_sysctl_unregister();
 235 #endif
 236         KLIPS_PRINT(debug_netlink, /* debug_tunnel & DB_TN_INIT, */
 237                     "klips_debug:ipsec_cleanup: "
 238                     "calling ipsec_tunnel_cleanup_devices.\n");
 239         error |= ipsec_tunnel_cleanup_devices();
 240
 241         KLIPS_PRINT(debug_netlink, "called ipsec_tunnel_cleanup_devices");
 242
 243 /* we never actually link IPCOMP to the stack */
 244 #ifdef IPCOMP_USED_ALONE
 245 #ifdef CONFIG_IPSEC_IPCOMP
 246         if (freeswan_inet_del_protocol(&comp_protocol, IPPROTO_COMP) < 0)
 247                 printk(KERN_INFO "klips_debug:ipsec_cleanup: "
 248                        "comp close: can't remove protocol\n");
 249 #endif /* CONFIG_IPSEC_IPCOMP */
 250 #endif /* IPCOMP_USED_ALONE */
 251
 252 #ifdef CONFIG_IPSEC_AH
 253         if (freeswan_inet_del_protocol(&ah_protocol, IPPROTO_AH) < 0)
 254                 printk(KERN_INFO "klips_debug:ipsec_cleanup: "
 255                        "ah close: can't remove protocol\n");
 256 #endif /* CONFIG_IPSEC_AH */
 257
 258 #ifdef CONFIG_IPSEC_ESP
 259         if (freeswan_inet_del_protocol(&esp_protocol, IPPROTO_ESP) < 0)
 260                 printk(KERN_INFO "klips_debug:ipsec_cleanup: "
 261                        "esp close: can't remove protocol\n");
 262 #endif /* CONFIG_IPSEC_ESP */
 263
 264         error |= unregister_netdevice_notifier(&ipsec_dev_notifier);
 265
 266         KLIPS_PRINT(debug_netlink, /* debug_tunnel & DB_TN_INIT, */
 267                     "klips_debug:ipsec_cleanup: "
 268                     "calling ipsec_sadb_cleanup.\n");
 269         error |= ipsec_sadb_cleanup(0);
 270         error |= ipsec_sadb_free();
 271
 272         KLIPS_PRINT(debug_netlink, /* debug_tunnel & DB_TN_INIT, */
 273                     "klips_debug:ipsec_cleanup: "
 274                     "calling ipsec_radijcleanup.\n");
 275         error |= ipsec_radijcleanup();
 276
 277         KLIPS_PRINT(debug_pfkey, /* debug_tunnel & DB_TN_INIT, */
 278                     "klips_debug:ipsec_cleanup: "
 279                     "calling pfkey_cleanup.\n");
 280         error |= pfkey_cleanup();
 281
 282         ipsec_proc_cleanup();
 283
 284         prng_final(&ipsec_prng);
 285
 286         return error;
 287 }
 288
 289 #ifdef MODULE
 290 int
 291 init_module(void)
 292 {
 293         int error = 0;
 294
 295         error |= ipsec_init();
 296
 297         return error;
 298 }
 299
 300 int
 301 cleanup_module(void)
 302 {
 303         int error = 0;
 304
 305         KLIPS_PRINT(debug_netlink, /* debug_tunnel & DB_TN_INIT, */
 306                     "klips_debug:cleanup_module: "
 307                     "calling ipsec_cleanup.\n");
 308
 309         error |= ipsec_cleanup();
 310
 311         KLIPS_PRINT(1, "klips_info:cleanup_module: "
 312                     "ipsec module unloaded.\n");
 313
 314         return error;
 315 }
 316 #endif /* MODULE */
 317
 318 /*
 319  * $Log: ipsec_init.c,v $
 320  * Revision 1.3  2004/06/13 19:57:49  as
 321  * removed inclusion of ipsec_netlink.h
 322  *
 323  * Revision 1.2  2004/03/22 21:53:19  as
 324  * merged alg-0.8.1 branch with HEAD
 325  *
 326  * Revision 1.1.4.1  2004/03/16 09:48:19  as
 327  * alg-0.8.1rc12 patch merged
 328  *
 329  * Revision 1.1  2004/03/15 20:35:26  as
 330  * added files from freeswan-2.04-x509-1.5.3
 331  *
 332  * Revision 1.89  2003/07/31 22:47:16  mcr
 333  *      preliminary (untested by FS-team) 2.5 patches.
 334  *
 335  * Revision 1.88  2003/06/22 20:05:36  mcr
 336  *      clarified why IPCOMP was not being registered, and put a new
 337  *      #ifdef in rather than #if 0.
 338  *
 339  * Revision 1.87  2002/09/20 15:40:51  rgb
 340  * Added a lock to the global ipsec_sadb struct for future use.
 341  * Split ipsec_sadb_cleanup from new funciton ipsec_sadb_free to avoid problem
 342  * of freeing newly created structures when clearing the reftable upon startup
 343  * to start from a known state.
 344  *
 345  * Revision 1.86  2002/08/15 18:39:15  rgb
 346  * Move ipsec_prng outside debug code.
 347  *
 348  * Revision 1.85  2002/05/14 02:35:29  rgb
 349  * Change reference to tdb to ipsa.
 350  *
 351  * Revision 1.84  2002/04/24 07:55:32  mcr
 352  *      #include patches and Makefiles for post-reorg compilation.
 353  *
 354  * Revision 1.83  2002/04/24 07:36:28  mcr
 355  * Moved from ./klips/net/ipsec/ipsec_init.c,v
 356  *
 357  * Revision 1.82  2002/04/20 00:12:25  rgb
 358  * Added esp IV CBC attack fix, disabled.
 359  *
 360  * Revision 1.81  2002/04/09 16:13:32  mcr
 361  *      switch license to straight GPL.
 362  *
 363  * Revision 1.80  2002/03/24 07:34:08  rgb
 364  * Sanity check for at least one of AH or ESP configured.
 365  *
 366  * Revision 1.79  2002/02/05 22:55:15  mcr
 367  *      added MODULE_LICENSE declaration.
 368  *      This macro does not appear in all kernel versions (see comment).
 369  *
 370  * Revision 1.78  2002/01/29 17:17:55  mcr
 371  *      moved include of ipsec_param.h to after include of linux/kernel.h
 372  *      otherwise, it seems that some option that is set in ipsec_param.h
 373  *      screws up something subtle in the include path to kernel.h, and
 374  *      it complains on the snprintf() prototype.
 375  *
 376  * Revision 1.77  2002/01/29 04:00:51  mcr
 377  *      more excise of kversions.h header.
 378  *
 379  * Revision 1.76  2002/01/29 02:13:17  mcr
 380  *      introduction of ipsec_kversion.h means that include of
 381  *      ipsec_param.h must preceed any decisions about what files to
 382  *      include to deal with differences in kernel source.
 383  *
 384  * Revision 1.75  2001/11/26 09:23:48  rgb
 385  * Merge MCR's ipsec_sa, eroute, proc and struct lifetime changes.
 386  *
 387  * Revision 1.74  2001/11/22 05:44:11  henry
 388  * new version stuff
 389  *
 390  * Revision 1.71.2.2  2001/10/22 20:51:00  mcr
 391  *      explicitely set des_check_key.
 392  *
 393  * Revision 1.71.2.1  2001/09/25 02:19:39  mcr
 394  *      /proc manipulation code moved to new ipsec_proc.c
 395  *
 396  * Revision 1.73  2001/11/06 19:47:17  rgb
 397  * Changed lifetime_packets to uint32 from uint64.
 398  *
 399  * Revision 1.72  2001/10/18 04:45:19  rgb
 400  * 2.4.9 kernel deprecates linux/malloc.h in favour of linux/slab.h,
 401  * lib/freeswan.h version macros moved to lib/kversions.h.
 402  * Other compiler directive cleanups.
 403  *
 404  * Revision 1.71  2001/09/20 15:32:45  rgb
 405  * Minor pfkey lifetime fixes.
 406  *
 407  * Revision 1.70  2001/07/06 19:51:21  rgb
 408  * Added inbound policy checking code for IPIP SAs.
 409  *
 410  * Revision 1.69  2001/06/14 19:33:26  rgb
 411  * Silence startup message for console, but allow it to be logged.
 412  * Update copyright date.
 413  *
 414  * Revision 1.68  2001/05/29 05:14:36  rgb
 415  * Added PMTU to /proc/net/ipsec_tncfg output.  See 'man 5 ipsec_tncfg'.
 416  *
 417  * Revision 1.67  2001/05/04 16:34:52  rgb
 418  * Rremove erroneous checking of return codes for proc_net_* in 2.4.
 419  *
 420  * Revision 1.66  2001/05/03 19:40:34  rgb
 421  * Check error return codes in startup and shutdown.
 422  *
 423  * Revision 1.65  2001/02/28 05:03:27  rgb
 424  * Clean up and rationalise startup messages.
 425  *
 426  * Revision 1.64  2001/02/27 22:24:53  rgb
 427  * Re-formatting debug output (line-splitting, joining, 1arg/line).
 428  * Check for satoa() return codes.
 429  *
 430  * Revision 1.63  2000/11/29 20:14:06  rgb
 431  * Add src= to the output of /proc/net/ipsec_spi and delete dst from IPIP.
 432  *
 433  * Revision 1.62  2000/11/06 04:31:24  rgb
 434  * Ditched spin_lock_irqsave in favour of spin_lock_bh.
 435  * Fixed longlong for pre-2.4 kernels (Svenning).
 436  * Add Svenning's adaptive content compression.
 437  * Disabled registration of ipcomp handler.
 438  *
 439  * Revision 1.61  2000/10/11 13:37:54  rgb
 440  * #ifdef out debug print that causes proc/net/ipsec_version to oops.
 441  *
 442  * Revision 1.60  2000/09/20 03:59:01  rgb
 443  * Change static info functions to DEBUG_NO_STATIC to reveal function names
 444  * in oopsen.
 445  *
 446  * Revision 1.59  2000/09/16 01:06:26  rgb
 447  * Added cast of var to silence compiler warning about long fed to int
 448  * format.
 449  *
 450  * Revision 1.58  2000/09/15 11:37:01  rgb
 451  * Merge in heavily modified Svenning Soerensen's <svenning@post5.tele.dk>
 452  * IPCOMP zlib deflate code.
 453  *
 454  * Revision 1.57  2000/09/12 03:21:50  rgb
 455  * Moved radij_c_version printing to ipsec_version_get_info().
 456  * Reformatted ipsec_version_get_info().
 457  * Added sysctl_{,un}register() calls.
 458  *
 459  * Revision 1.56  2000/09/08 19:16:50  rgb
 460  * Change references from DEBUG_IPSEC to CONFIG_IPSEC_DEBUG.
 461  * Removed all references to CONFIG_IPSEC_PFKEYv2.
 462  *
 463  * Revision 1.55  2000/08/30 05:19:03  rgb
 464  * Cleaned up no longer used spi_next, netlink register/unregister, other
 465  * minor cleanup.
 466  * Removed cruft replaced by TDB_XFORM_NAME.
 467  * Removed all the rest of the references to tdb_spi, tdb_proto, tdb_dst.
 468  * Moved debug version strings to printk when /proc/net/ipsec_version is
 469  * called.
 470  *
 471  * Revision 1.54  2000/08/20 18:31:05  rgb
 472  * Changed cosmetic alignment in spi_info.
 473  * Changed addtime and usetime to use actual value which is relative
 474  * anyways, as intended. (Momchil)
 475  *
 476  * Revision 1.53  2000/08/18 17:37:03  rgb
 477  * Added an (int) cast to shut up the compiler...
 478  *
 479  * Revision 1.52  2000/08/01 14:51:50  rgb
 480  * Removed _all_ remaining traces of DES.
 481  *
 482  * Revision 1.51  2000/07/25 20:41:22  rgb
 483  * Removed duplicate parameter in spi_getinfo.
 484  *
 485  * Revision 1.50  2000/07/17 03:21:45  rgb
 486  * Removed /proc/net/ipsec_spinew.
 487  *
 488  * Revision 1.49  2000/06/28 05:46:51  rgb
 489  * Renamed ivlen to iv_bits for consistency.
 490  * Changed output of add and use times to be relative to now.
 491  *
 492  * Revision 1.48  2000/05/11 18:26:10  rgb
 493  * Commented out calls to netlink_attach/detach to avoid activating netlink
 494  * in the kenrel config.
 495  *
 496  * Revision 1.47  2000/05/10 22:35:26  rgb
 497  * Comment out most of the startup version information.
 498  *
 499  * Revision 1.46  2000/03/22 16:15:36  rgb
 500  * Fixed renaming of dev_get (MB).
 501  *
 502  * Revision 1.45  2000/03/16 06:40:48  rgb
 503  * Hardcode PF_KEYv2 support.
 504  *
 505  * Revision 1.44  2000/01/22 23:19:20  rgb
 506  * Simplified code to use existing macro TDB_XFORM_NAME().
 507  *
 508  * Revision 1.43  2000/01/21 06:14:04  rgb
 509  * Print individual stats only if non-zero.
 510  * Removed 'bits' from each keylength for brevity.
 511  * Shortened lifetimes legend for brevity.
 512  * Changed wording from 'last_used' to the clearer 'idle'.
 513  *
 514  * Revision 1.42  1999/12/31 14:57:19  rgb
 515  * MB fix for new dummy-less proc_get_info in 2.3.35.
 516  *
 517  * Revision 1.41  1999/11/23 23:04:03  rgb
 518  * Use provided macro ADDRTOA_BUF instead of hardcoded value.
 519  * Sort out pfkey and freeswan headers, putting them in a library path.
 520  *
 521  * Revision 1.40  1999/11/18 18:47:01  rgb
 522  * Added dynamic proc registration for 2.3.25+.
 523  * Changed all device registrations for static linking to
 524  * dynamic to reduce the number and size of patches.
 525  * Changed all protocol registrations for static linking to
 526  * dynamic to reduce the number and size of patches.
 527  *
 528  * Revision 1.39  1999/11/18 04:12:07  rgb
 529  * Replaced all kernel version macros to shorter, readable form.
 530  * Added Marc Boucher's 2.3.25 proc patches.
 531  * Converted all PROC_FS entries to dynamic to reduce kernel patching.
 532  * Added CONFIG_PROC_FS compiler directives in case it is shut off.
 533  *
 534  * Revision 1.38  1999/11/17 15:53:38  rgb
 535  * Changed all occurrences of #include "../../../lib/freeswan.h"
 536  * to #include <freeswan.h> which works due to -Ilibfreeswan in the
 537  * klips/net/ipsec/Makefile.
 538  *
 539  * Revision 1.37  1999/10/16 04:23:06  rgb
 540  * Add stats for replaywin_errs, replaywin_max_sequence_difference,
 541  * authentication errors, encryption size errors, encryption padding
 542  * errors, and time since last packet.
 543  *
 544  * Revision 1.36  1999/10/16 00:30:47  rgb
 545  * Added SA lifetime counting.
 546  *
 547  * Revision 1.35  1999/10/15 22:14:00  rgb
 548  * Clean out cruft.
 549  *
 550  * Revision 1.34  1999/10/03 18:46:28  rgb
 551  * Spinlock fixes for 2.0.xx and 2.3.xx.
 552  *
 553  * Revision 1.33  1999/10/01 17:08:10  rgb
 554  * Disable spinlock init.
 555  *
 556  * Revision 1.32  1999/10/01 16:22:24  rgb
 557  * Switch from assignment init. to functional init. of spinlocks.
 558  *
 559  * Revision 1.31  1999/10/01 15:44:52  rgb
 560  * Move spinlock header include to 2.1> scope.
 561  *
 562  * Revision 1.30  1999/10/01 00:00:16  rgb
 563  * Added eroute structure locking.
 564  * Added tdb structure locking.
 565  * Minor formatting changes.
 566  * Add call to initialize tdb hash table.
 567  *
 568  * Revision 1.29  1999/09/23 20:22:40  rgb
 569  * Enable, tidy and fix network notifier code.
 570  *
 571  * Revision 1.28  1999/09/18 11:39:56  rgb
 572  * Start to add (disabled) netdevice notifier code.
 573  *
 574  * Revision 1.27  1999/08/28 08:24:47  rgb
 575  * Add compiler directives to compile cleanly without debugging.
 576  *
 577  * Revision 1.26  1999/08/06 16:03:22  rgb
 578  * Correct error messages on failure to unload /proc entries.
 579  *
 580  * Revision 1.25  1999/08/03 17:07:25  rgb
 581  * Report device MTU, not private MTU.
 582  *
 583  * Revision 1.24  1999/05/25 22:24:37  rgb
 584  * /PROC/NET/ipsec* init problem fix.
 585  *
 586  * Revision 1.23  1999/05/25 02:16:38  rgb
 587  * Make modular proc_fs entries dynamic and fix for 2.2.x.
 588  *
 589  * Revision 1.22  1999/05/09 03:25:35  rgb
 590  * Fix bug introduced by 2.2 quick-and-dirty patch.
 591  *
 592  * Revision 1.21  1999/05/05 22:02:30  rgb
 593  * Add a quick and dirty port to 2.2 kernels by Marc Boucher <marc@mbsi.ca>.
 594  *
 595  * Revision 1.20  1999/04/29 15:15:50  rgb
 596  * Fix undetected iv_len reporting bug.
 597  * Add sanity checking for null pointer to private data space.
 598  * Add return values to init and cleanup functions.
 599  *
 600  * Revision 1.19  1999/04/27 19:24:44  rgb
 601  * Added /proc/net/ipsec_klipsdebug support for reading the current debug
 602  * settings.
 603  * Instrument module load/init/unload.
 604  *
 605  * Revision 1.18  1999/04/15 15:37:24  rgb
 606  * Forward check changes from POST1_00 branch.
 607  *
 608  * Revision 1.15.2.3  1999/04/13 20:29:19  rgb
 609  * /proc/net/ipsec_* cleanup.
 610  *
 611  * Revision 1.15.2.2  1999/04/02 04:28:23  rgb
 612  * /proc/net/ipsec_* formatting enhancements.
 613  *
 614  * Revision 1.15.2.1  1999/03/30 17:08:33  rgb
 615  * Add pfkey initialisation.
 616  *
 617  * Revision 1.17  1999/04/11 00:28:57  henry
 618  * GPL boilerplate
 619  *
 620  * Revision 1.16  1999/04/06 04:54:25  rgb
 621  * Fix/Add RCSID Id: and Log: bits to make PHMDs happy.  This includes
 622  * patch shell fixes.
 623  *
 624  * Revision 1.15  1999/02/24 20:15:07  rgb
 625  * Update output format.
 626  *
 627  * Revision 1.14  1999/02/17 16:49:39  rgb
 628  * Convert DEBUG_IPSEC to KLIPS_PRINT
 629  * Ditch NET_IPIP dependancy.
 630  *
 631  * Revision 1.13  1999/01/26 02:06:37  rgb
 632  * Remove ah/esp switching on include files.
 633  * Removed CONFIG_IPSEC_ALGO_SWITCH macro.
 634  * Removed dead code.
 635  * Remove references to INET_GET_PROTOCOL.
 636  *
 637  * Revision 1.12  1999/01/22 06:19:18  rgb
 638  * Cruft clean-out.
 639  * 64-bit clean-up.
 640  * Added algorithm switch code.
 641  *
 642  * Revision 1.11  1998/12/01 05:54:53  rgb
 643  * Cleanup and order debug version output.
 644  *
 645  * Revision 1.10  1998/11/30 13:22:54  rgb
 646  * Rationalised all the klips kernel file headers.  They are much shorter
 647  * now and won't conflict under RH5.2.
 648  *
 649  * Revision 1.9  1998/11/10 05:35:13  rgb
 650  * Print direction in/out flag from /proc/net/ipsec_spi.
 651  *
 652  * Revision 1.8  1998/10/27 13:48:10  rgb
 653  * Cleaned up /proc/net/ipsec_* filesystem for easy parsing by scripts.
 654  * Fixed less(1) truncated output bug.
 655  * Code clean-up.
 656  *
 657  * Revision 1.7  1998/10/22 06:43:16  rgb
 658  * Convert to use satoa for printk.
 659  *
 660  * Revision 1.6  1998/10/19 14:24:35  rgb
 661  * Added inclusion of freeswan.h.
 662  *
 663  * Revision 1.5  1998/10/09 04:43:35  rgb
 664  * Added 'klips_debug' prefix to all klips printk debug statements.
 665  *
 666  * Revision 1.4  1998/07/27 21:50:22  rgb
 667  * Not necessary to traverse mask tree for /proc/net/ipsec_eroute.
 668  *
 669  * Revision 1.3  1998/06/25 19:51:20  rgb
 670  * Clean up #endif comments.
 671  * Shift debugging comment control for procfs to debug_tunnel.
 672  * Make proc_dir_entries visible to rest of kernel for static link.
 673  * Replace hardwired fileperms with macros.
 674  * Use macros for procfs inode numbers.
 675  * Rearrange initialisations between ipsec_init and module_init as appropriate
 676  * for static loading.
 677  *
 678  * Revision 1.2  1998/06/23 02:55:43  rgb
 679  * Slightly quieted init-time messages.
 680  * Re-introduced inet_add_protocol after it mysteriously disappeared...
 681  * Check for and warn of absence of IPIP protocol on install of module.
 682  * Move tdbcleanup to ipsec_xform.c.
 683  *
 684  * Revision 1.10  1998/06/18 21:29:04  henry
 685  * move sources from klips/src to klips/net/ipsec, to keep stupid kernel
 686  * build scripts happier in presence of symbolic links
 687  *
 688  * Revision 1.9  1998/06/14 23:49:40  rgb
 689  * Clarify version reporting on module loading.
 690  *
 691  * Revision 1.8  1998/06/11 05:54:23  rgb
 692  * Added /proc/net/ipsec_version to report freeswan and transform versions.
 693  * Added /proc/net/ipsec_spinew to generate new and unique spi's..
 694  * Fixed /proc/net/ipsec_tncfg bug.
 695  *
 696  * Revision 1.7  1998/05/25 20:23:13  rgb
 697  * proc_register changed to dynamic registration to avoid arbitrary inode
 698  * numbers.
 699  *
 700  * Implement memory recovery from tdb and eroute tables.
 701  *
 702  * Revision 1.6  1998/05/21 13:08:58  rgb
 703  * Rewrote procinfo subroutines to avoid *bad things* when more that 3k of
 704  * information is available for printout.
 705  *
 706  * Revision 1.5  1998/05/18 21:29:48  rgb
 707  * Cleaned up /proc/net/ipsec_* output, including a title line, algorithm
 708  * names instead of numbers, standard format for numerical output base,
 709  * whitespace for legibility, and the names themselves for consistency.
 710  *
 711  * Added /proc/net/ipsec_spigrp and /proc/net/ipsec_tncfg.
 712  *
 713  * Revision 1.4  1998/04/30 15:42:24  rgb
 714  * Silencing attach for normal operations with #ifdef IPSEC_DEBUG.
 715  *
 716  * Revision 1.3  1998/04/21 21:28:58  rgb
 717  * Rearrange debug switches to change on the fly debug output from user
 718  * space.  Only kernel changes checked in at this time.  radij.c was also
 719  * changed to temporarily remove buggy debugging code in rj_delete causing
 720  * an OOPS and hence, netlink device open errors.
 721  *
 722  * Revision 1.2  1998/04/12 22:03:22  rgb
 723  * Updated ESP-3DES-HMAC-MD5-96,
 724  *      ESP-DES-HMAC-MD5-96,
 725  *      AH-HMAC-MD5-96,
 726  *      AH-HMAC-SHA1-96 since Henry started freeswan cvs repository
 727  * from old standards (RFC182[5-9] to new (as of March 1998) drafts.
 728  *
 729  * Fixed eroute references in /proc/net/ipsec*.
 730  *
 731  * Started to patch module unloading memory leaks in ipsec_netlink and
 732  * radij tree unloading.
 733  *
 734  * Revision 1.1  1998/04/09 03:06:05  henry
 735  * sources moved up from linux/net/ipsec
 736  *
 737  * Revision 1.1.1.1  1998/04/08 05:35:02  henry
 738  * RGB's ipsec-0.8pre2.tar.gz ipsec-0.8
 739  *
 740  * Revision 0.4  1997/01/15 01:28:15  ji
 741  * No changes.
 742  *
 743  * Revision 0.3  1996/11/20 14:39:04  ji
 744  * Fixed problem with node names of /proc/net entries.
 745  * Other minor cleanups.
 746  * Rationalized debugging code.
 747  *
 748  * Revision 0.2  1996/11/02 00:18:33  ji
 749  * First limited release.
 750  *
 751  * Local variables:
 752  * c-file-style: "linux"
 753  * End:
 754  *
 755  */