dist/ipf/tools/ipnat.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2001-2006 by Darren Reed.
   5  *
   6  * See the IPFILTER.LICENCE file for details on licencing.
   7  *
   8  * Added redirect stuff and a variety of bug fixes. (mcn@EnGarde.com)
   9  */
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <fcntl.h>
  13 #include <errno.h>
  14 #include <sys/types.h>
  15 #if !defined(__SVR4) && !defined(__svr4__)
  16 #include <strings.h>
  17 #else
  18 #include <sys/byteorder.h>
  19 #endif
  20 #include <sys/time.h>
  21 #include <sys/param.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <stddef.h>
  25 #include <sys/file.h>
  26 #define _KERNEL
  27 #include <sys/uio.h>
  28 #undef _KERNEL
  29 #include <sys/socket.h>
  30 #include <sys/ioctl.h>
  31 #if defined(sun) && (defined(__svr4__) || defined(__SVR4))
  32 # include <sys/ioccom.h>
  33 # include <sys/sysmacros.h>
  34 #endif
  35 #include <netinet/in.h>
  36 #include <netinet/in_systm.h>
  37 #include <netinet/ip.h>
  38 #include <netinet/tcp.h>
  39 #include <net/if.h>
  40 #if __FreeBSD_version >= 300000
  41 # include <net/if_var.h>
  42 #endif
  43 #include <netdb.h>
  44 #include <arpa/nameser.h>
  45 #include <arpa/inet.h>
  46 #include <resolv.h>
  47 #include <ctype.h>
  48 #if defined(linux)
  49 # include <linux/a.out.h>
  50 #else
  51 # include <nlist.h>
  52 #endif
  53 #include "ipf.h"
  54 #include "netinet/ipl.h"
  55 #include "kmem.h"
  56
  57 #ifdef  __hpux
  58 # define        nlist   nlist64
  59 #endif
  60
  61 #if     defined(sun) && !SOLARIS2
  62 # define        STRERROR(x)     sys_errlist[x]
  63 extern  char    *sys_errlist[];
  64 #else
  65 # define        STRERROR(x)     strerror(x)
  66 #endif
  67
  68 #if !defined(lint)
  69 static const char sccsid[] ="@(#)ipnat.c        1.9 6/5/96 (C) 1993 Darren Reed";
  70 static const char rcsid[] = "@(#)Id: ipnat.c,v 1.24.2.12 2008/11/06 21:18:20 darrenr Exp";
  71 #endif
  72
  73
  74 #if     SOLARIS
  75 #define bzero(a,b)      memset(a,0,b)
  76 #endif
  77 int     use_inet6 = 0;
  78 char    thishost[MAXHOSTNAMELEN];
  79
  80 extern  char    *optarg;
  81
  82 void    dostats __P((int, natstat_t *, int, int));
  83 void    dotable __P((natstat_t *, int, int));
  84 void    flushtable __P((int, int));
  85 void    usage __P((char *));
  86 int     main __P((int, char*[]));
  87 void    showhostmap __P((natstat_t *nsp));
  88 void    natstat_dead __P((natstat_t *, char *));
  89 void    dostats_live __P((int, natstat_t *, int));
  90 void    showhostmap_dead __P((natstat_t *));
  91 void    showhostmap_live __P((int, natstat_t *));
  92 void    dostats_dead __P((natstat_t *, int));
  93 void    showtqtable_live __P((int));
  94
  95 int     opts;
  96
  97 void usage(name)
  98 char *name;
  99 {
 100         fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-f filename]\n", name);
 101         exit(1);
 102 }
 103
 104
 105 int main(argc, argv)
 106 int argc;
 107 char *argv[];
 108 {
 109         char *file, *core, *kernel;
 110         natstat_t ns, *nsp;
 111         int fd, c, mode;
 112         ipfobj_t obj;
 113
 114         fd = -1;
 115         opts = 0;
 116         nsp = &ns;
 117         file = NULL;
 118         core = NULL;
 119         kernel = NULL;
 120         mode = O_RDWR;
 121
 122         while ((c = getopt(argc, argv, "CdFf:hlM:N:nrRsv")) != -1)
 123                 switch (c)
 124                 {
 125                 case 'C' :
 126                         opts |= OPT_CLEAR;
 127                         break;
 128                 case 'd' :
 129                         opts |= OPT_DEBUG;
 130                         break;
 131                 case 'f' :
 132                         file = optarg;
 133                         break;
 134                 case 'F' :
 135                         opts |= OPT_FLUSH;
 136                         break;
 137                 case 'h' :
 138                         opts |=OPT_HITS;
 139                         break;
 140                 case 'l' :
 141                         opts |= OPT_LIST;
 142                         mode = O_RDONLY;
 143                         break;
 144                 case 'M' :
 145                         core = optarg;
 146                         break;
 147                 case 'N' :
 148                         kernel = optarg;
 149                         break;
 150                 case 'n' :
 151                         opts |= OPT_DONOTHING;
 152                         mode = O_RDONLY;
 153                         break;
 154                 case 'R' :
 155                         opts |= OPT_NORESOLVE;
 156                         break;
 157                 case 'r' :
 158                         opts |= OPT_REMOVE;
 159                         break;
 160                 case 's' :
 161                         opts |= OPT_STAT;
 162                         mode = O_RDONLY;
 163                         break;
 164                 case 'v' :
 165                         opts |= OPT_VERBOSE;
 166                         break;
 167                 default :
 168                         usage(argv[0]);
 169                 }
 170
 171         initparse();
 172
 173         if ((kernel != NULL) || (core != NULL)) {
 174                 (void) setgid(getgid());
 175                 (void) setuid(getuid());
 176         }
 177
 178         if (!(opts & OPT_DONOTHING)) {
 179                 if (((fd = open(IPNAT_NAME, mode)) == -1) &&
 180                     ((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
 181                         (void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
 182                                 STRERROR(errno));
 183                         exit(1);
 184                 }
 185         }
 186
 187         bzero((char *)&ns, sizeof(ns));
 188
 189         if ((opts & OPT_DONOTHING) == 0) {
 190                 if (checkrev(IPL_NAME) == -1) {
 191                         fprintf(stderr, "User/kernel version check failed\n");
 192                         exit(1);
 193                 }
 194         }
 195
 196         if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
 197                 bzero((char *)&obj, sizeof(obj));
 198                 obj.ipfo_rev = IPFILTER_VERSION;
 199                 obj.ipfo_type = IPFOBJ_NATSTAT;
 200                 obj.ipfo_size = sizeof(*nsp);
 201                 obj.ipfo_ptr = (void *)nsp;
 202                 if (ioctl(fd, SIOCGNATS, &obj) == -1) {
 203                         perror("ioctl(SIOCGNATS)");
 204                         exit(1);
 205                 }
 206                 (void) setgid(getgid());
 207                 (void) setuid(getuid());
 208         } else if ((kernel != NULL) || (core != NULL)) {
 209                 if (openkmem(kernel, core) == -1)
 210                         exit(1);
 211
 212                 natstat_dead(nsp, kernel);
 213                 if (opts & (OPT_LIST|OPT_STAT))
 214                         dostats(fd, nsp, opts, 0);
 215                 exit(0);
 216         }
 217
 218         if (opts & (OPT_FLUSH|OPT_CLEAR))
 219                 flushtable(fd, opts);
 220         if (file) {
 221                 ipnat_parsefile(fd, ipnat_addrule, ioctl, file);
 222         }
 223         if (opts & (OPT_LIST|OPT_STAT))
 224                 dostats(fd, nsp, opts, 1);
 225         return 0;
 226 }
 227
 228
 229 /*
 230  * Read NAT statistic information in using a symbol table and memory file
 231  * rather than doing ioctl's.
 232  */
 233 void natstat_dead(nsp, kernel)
 234 natstat_t *nsp;
 235 char *kernel;
 236 {
 237         struct nlist nat_nlist[10] = {
 238                 { "nat_table" },                /* 0 */
 239                 { "nat_list" },
 240                 { "maptable" },
 241                 { "ipf_nattable_sz" },
 242                 { "ipf_natrules_sz" },
 243                 { "ipf_rdrrules_sz" },          /* 5 */
 244                 { "ipf_hostmap_sz" },
 245                 { "nat_instances" },
 246                 { "ap_sess_list" },
 247                 { NULL }
 248         };
 249         void *tables[2];
 250
 251         if (nlist(kernel, nat_nlist) == -1) {
 252                 fprintf(stderr, "nlist error\n");
 253                 return;
 254         }
 255
 256         /*
 257          * Normally the ioctl copies all of these values into the structure
 258          * for us, before returning it to userland, so here we must copy each
 259          * one in individually.
 260          */
 261         kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
 262         nsp->ns_table[0] = tables[0];
 263         nsp->ns_table[1] = tables[1];
 264
 265         kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
 266                 sizeof(nsp->ns_list));
 267         kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
 268                 sizeof(nsp->ns_maptable));
 269         kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
 270                 sizeof(nsp->ns_nattab_sz));
 271         kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
 272                 sizeof(nsp->ns_rultab_sz));
 273         kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
 274                 sizeof(nsp->ns_rdrtab_sz));
 275         kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
 276                 sizeof(nsp->ns_hostmap_sz));
 277         kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
 278                 sizeof(nsp->ns_instances));
 279         kmemcpy((char *)&nsp->ns_apslist, nat_nlist[8].n_value,
 280                 sizeof(nsp->ns_apslist));
 281 }
 282
 283
 284 /*
 285  * Issue an ioctl to flush either the NAT rules table or the active mapping
 286  * table or both.
 287  */
 288 void flushtable(fd, opts)
 289 int fd, opts;
 290 {
 291         int n = 0;
 292
 293         if (opts & OPT_FLUSH) {
 294                 n = 0;
 295                 if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
 296                         perror("ioctl(SIOCFLNAT)");
 297                 else
 298                         printf("%d entries flushed from NAT table\n", n);
 299         }
 300
 301         if (opts & OPT_CLEAR) {
 302                 n = 1;
 303                 if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
 304                         perror("ioctl(SIOCCNATL)");
 305                 else
 306                         printf("%d entries flushed from NAT list\n", n);
 307         }
 308 }
 309
 310
 311 /*
 312  * Display NAT statistics.
 313  */
 314 void dostats_dead(nsp, opts)
 315 natstat_t *nsp;
 316 int opts;
 317 {
 318         nat_t *np, nat;
 319         ipnat_t ipn;
 320
 321         printf("List of active MAP/Redirect filters:\n");
 322         while (nsp->ns_list) {
 323                 if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
 324                             sizeof(ipn))) {
 325                         perror("kmemcpy");
 326                         break;
 327                 }
 328                 if (opts & OPT_HITS)
 329                         printf("%lu ", ipn.in_hits);
 330                 printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
 331                 nsp->ns_list = ipn.in_next;
 332         }
 333
 334         printf("\nList of active sessions:\n");
 335
 336         for (np = nsp->ns_instances; np; np = nat.nat_next) {
 337                 if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
 338                         break;
 339                 printactivenat(&nat, opts, 0, nsp->ns_ticks);
 340                 if (nat.nat_aps)
 341                         printaps(nat.nat_aps, opts);
 342         }
 343
 344         if (opts & OPT_VERBOSE)
 345                 showhostmap_dead(nsp);
 346 }
 347
 348
 349 void dostats(fd, nsp, opts, alive)
 350 natstat_t *nsp;
 351 int fd, opts, alive;
 352 {
 353         /*
 354          * Show statistics ?
 355          */
 356         if (opts & OPT_STAT) {
 357                 printf("mapped\tin\t%lu\tout\t%lu\n",
 358                         nsp->ns_mapped[0], nsp->ns_mapped[1]);
 359                 printf("added\t%lu\texpired\t%lu\n",
 360                         nsp->ns_added, nsp->ns_expire);
 361                 printf("no memory\t%lu\tbad nat\t%lu\n",
 362                         nsp->ns_memfail, nsp->ns_badnat);
 363                 printf("inuse\t%lu\norphans\t%u\nrules\t%lu\n",
 364                         nsp->ns_inuse, nsp->ns_orphans, nsp->ns_rules);
 365                 printf("in-uncreates succeed\t%lu\tfailed\t%lu\n",
 366                         nsp->ns_uncreate[0][0], nsp->ns_uncreate[0][1]);
 367                 printf("out-uncreates succeed\t%lu\tfailed\t%lu\n",
 368                         nsp->ns_uncreate[1][0], nsp->ns_uncreate[1][1]);
 369                 printf("wilds\t%u\n", nsp->ns_wilds);
 370                 dotable(nsp, fd, alive);
 371                 if (opts & OPT_VERBOSE)
 372                         printf("table %p list %p\n",
 373                                 nsp->ns_table, nsp->ns_list);
 374                 if (alive)
 375                         showtqtable_live(fd);
 376         }
 377
 378         if (opts & OPT_LIST) {
 379                 if (alive)
 380                         dostats_live(fd, nsp, opts);
 381                 else
 382                         dostats_dead(nsp, opts);
 383         }
 384 }
 385
 386
 387 void dotable(nsp, fd, alive)
 388 natstat_t *nsp;
 389 int fd, alive;
 390 {
 391         int sz, i, used, totallen, maxlen, minlen;
 392         ipftable_t table;
 393         u_long *buckets;
 394         ipfobj_t obj;
 395
 396         sz = sizeof(*buckets) * nsp->ns_nattab_sz;
 397         buckets = (u_long *)malloc(sz);
 398
 399         obj.ipfo_rev = IPFILTER_VERSION;
 400         obj.ipfo_type = IPFOBJ_GTABLE;
 401         obj.ipfo_size = sizeof(table);
 402         obj.ipfo_ptr = &table;
 403
 404         table.ita_type = IPFTABLE_BUCKETS_NATIN;
 405         table.ita_table = buckets;
 406
 407         if (alive) {
 408                 if (ioctl(fd, SIOCGTABL, &obj) != 0) {
 409                         free(buckets);
 410                         return;
 411                 }
 412         } else {
 413                 if (kmemcpy((char *)buckets, (u_long)nsp->ns_nattab_sz, sz)) {
 414                         free(buckets);
 415                         return;
 416                 }
 417         }
 418
 419         totallen = 0;
 420         maxlen = 0;
 421         minlen = nsp->ns_inuse;
 422         used = 0;
 423
 424         for (i = 0; i < nsp->ns_nattab_sz; i++) {
 425                 if (buckets[i] > maxlen)
 426                         maxlen = buckets[i];
 427                 if (buckets[i] < minlen)
 428                         minlen = buckets[i];
 429                 if (buckets[i] != 0)
 430                         used++;
 431                 totallen += buckets[i];
 432         }
 433
 434         printf("hash efficiency\t%2.2f%%\n",
 435                totallen ? ((float)used / totallen) * 100.0 : 0.0);
 436         printf("bucket usage\t%2.2f%%\n",
 437                 ((float)used / nsp->ns_nattab_sz) * 100.0);
 438         printf("minimal length\t%d\n", minlen);
 439         printf("maximal length\t%d\n", maxlen);
 440         printf("average length\t%.3f\n", used ? (float)totallen / used : 0.0);
 441 }
 442
 443
 444 /*
 445  * Display NAT statistics.
 446  */
 447 void dostats_live(fd, nsp, opts)
 448 natstat_t *nsp;
 449 int fd, opts;
 450 {
 451         ipfgeniter_t iter;
 452         ipfobj_t obj;
 453         ipnat_t ipn;
 454         nat_t nat;
 455
 456         bzero((char *)&obj, sizeof(obj));
 457         obj.ipfo_rev = IPFILTER_VERSION;
 458         obj.ipfo_type = IPFOBJ_GENITER;
 459         obj.ipfo_size = sizeof(iter);
 460         obj.ipfo_ptr = &iter;
 461
 462         iter.igi_type = IPFGENITER_IPNAT;
 463         iter.igi_nitems = 1;
 464         iter.igi_data = &ipn;
 465
 466         /*
 467          * Show list of NAT rules and NAT sessions ?
 468          */
 469         printf("List of active MAP/Redirect filters:\n");
 470         while (nsp->ns_list) {
 471                 if (ioctl(fd, SIOCGENITER, &obj) == -1)
 472                         break;
 473                 if (opts & OPT_HITS)
 474                         printf("%lu ", ipn.in_hits);
 475                 printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
 476                 nsp->ns_list = ipn.in_next;
 477         }
 478
 479         printf("\nList of active sessions:\n");
 480
 481         iter.igi_type = IPFGENITER_NAT;
 482         iter.igi_nitems = 1;
 483         iter.igi_data = &nat;
 484
 485         while (nsp->ns_instances != NULL) {
 486                 if (ioctl(fd, SIOCGENITER, &obj) == -1)
 487                         break;
 488                 printactivenat(&nat, opts, 1, nsp->ns_ticks);
 489                 if (nat.nat_aps)
 490                         printaps(nat.nat_aps, opts);
 491                 nsp->ns_instances = nat.nat_next;
 492         }
 493
 494         if (opts & OPT_VERBOSE)
 495                 showhostmap_live(fd, nsp);
 496 }
 497
 498
 499 /*
 500  * Display the active host mapping table.
 501  */
 502 void showhostmap_dead(nsp)
 503 natstat_t *nsp;
 504 {
 505         hostmap_t hm, *hmp, **maptable;
 506         u_int hv;
 507
 508         printf("\nList of active host mappings:\n");
 509
 510         maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
 511                                         nsp->ns_hostmap_sz);
 512         if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
 513                     sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) {
 514                 perror("kmemcpy (maptable)");
 515                 return;
 516         }
 517
 518         for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
 519                 hmp = maptable[hv];
 520
 521                 while (hmp) {
 522                         if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
 523                                 perror("kmemcpy (hostmap)");
 524                                 return;
 525                         }
 526
 527                         printhostmap(&hm, hv);
 528                         hmp = hm.hm_next;
 529                 }
 530         }
 531         free(maptable);
 532 }
 533
 534
 535 /*
 536  * Display the active host mapping table.
 537  */
 538 void showhostmap_live(fd, nsp)
 539 int fd;
 540 natstat_t *nsp;
 541 {
 542         ipfgeniter_t iter;
 543         hostmap_t hm;
 544         ipfobj_t obj;
 545
 546         bzero((char *)&obj, sizeof(obj));
 547         obj.ipfo_rev = IPFILTER_VERSION;
 548         obj.ipfo_type = IPFOBJ_GENITER;
 549         obj.ipfo_size = sizeof(iter);
 550         obj.ipfo_ptr = &iter;
 551
 552         iter.igi_type = IPFGENITER_HOSTMAP;
 553         iter.igi_nitems = 1;
 554         iter.igi_data = &hm;
 555
 556         printf("\nList of active host mappings:\n");
 557
 558         while (nsp->ns_maplist != NULL) {
 559                 if (ioctl(fd, SIOCGENITER, &obj) == -1)
 560                         break;
 561                 printhostmap(&hm, 0);
 562                 nsp->ns_maplist = hm.hm_next;
 563         }
 564 }
 565
 566
 567 void showtqtable_live(fd)
 568 int fd;
 569 {
 570         ipftq_t table[IPF_TCP_NSTATES];
 571         ipfobj_t obj;
 572
 573         bzero((char *)&obj, sizeof(obj));
 574         obj.ipfo_rev = IPFILTER_VERSION;
 575         obj.ipfo_size = sizeof(table);
 576         obj.ipfo_ptr = (void *)table;
 577         obj.ipfo_type = IPFOBJ_STATETQTAB;
 578
 579         if (ioctl(fd, SIOCGTQTAB, &obj) == 0) {
 580                 printtqtable(table);
 581         }
 582 }