ipsets.c

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include "ipsets.h"
  20
  21
  22 const struct fw3_option fw3_ipset_opts[] = {
  23         FW3_OPT("name",          string,         ipset,     name),
  24         FW3_OPT("family",        family,         ipset,     family),
  25
  26         FW3_OPT("storage",       ipset_method,   ipset,     method),
  27         FW3_LIST("match",        ipset_datatype, ipset,     datatypes),
  28
  29         FW3_LIST("iprange",      address,        ipset,     iprange),
  30         FW3_OPT("portrange",     port,           ipset,     portrange),
  31
  32         FW3_OPT("netmask",       int,            ipset,     netmask),
  33         FW3_OPT("maxelem",       int,            ipset,     maxelem),
  34         FW3_OPT("hashsize",      int,            ipset,     hashsize),
  35         FW3_OPT("timeout",       int,            ipset,     timeout),
  36
  37         FW3_OPT("external",      string,         ipset,     external),
  38
  39         { }
  40 };
  41
  42 #define T(m, t1, t2, t3, r, o) \
  43         { FW3_IPSET_METHOD_##m, \
  44           FW3_IPSET_TYPE_##t1 | (FW3_IPSET_TYPE_##t2 << 8) | (FW3_IPSET_TYPE_##t3 << 16), \
  45           r, o }
  46
  47 enum ipset_optflag {
  48         OPT_IPRANGE   = (1 << 0),
  49         OPT_PORTRANGE = (1 << 1),
  50         OPT_NETMASK   = (1 << 2),
  51         OPT_HASHSIZE  = (1 << 3),
  52         OPT_MAXELEM   = (1 << 4),
  53         OPT_FAMILY    = (1 << 5),
  54 };
  55
  56 struct ipset_type {
  57         enum fw3_ipset_method method;
  58         uint32_t types;
  59         uint8_t required;
  60         uint8_t optional;
  61 };
  62
  63 static struct ipset_type ipset_types[] = {
  64         T(BITMAP, IP,   UNSPEC, UNSPEC, OPT_IPRANGE, OPT_NETMASK),
  65         T(BITMAP, IP,   MAC,    UNSPEC, OPT_IPRANGE, 0),
  66         T(BITMAP, PORT, UNSPEC, UNSPEC, OPT_PORTRANGE, 0),
  67
  68         T(HASH,   IP,   UNSPEC, UNSPEC, 0,
  69           OPT_FAMILY | OPT_HASHSIZE | OPT_MAXELEM | OPT_NETMASK),
  70         T(HASH,   NET,  UNSPEC, UNSPEC, 0,
  71           OPT_FAMILY | OPT_HASHSIZE | OPT_MAXELEM),
  72         T(HASH,   IP,   PORT,   UNSPEC, 0,
  73           OPT_FAMILY | OPT_HASHSIZE | OPT_MAXELEM),
  74         T(HASH,   NET,  PORT,   UNSPEC, 0,
  75           OPT_FAMILY | OPT_HASHSIZE | OPT_MAXELEM),
  76         T(HASH,   IP,   PORT,   IP,     0,
  77           OPT_FAMILY | OPT_HASHSIZE | OPT_MAXELEM),
  78         T(HASH,   IP,   PORT,   NET,    0,
  79           OPT_FAMILY | OPT_HASHSIZE | OPT_MAXELEM),
  80
  81         T(LIST,   SET,  UNSPEC, UNSPEC, 0, OPT_MAXELEM),
  82 };
  83
  84
  85 static bool
  86 check_types(struct uci_element *e, struct fw3_ipset *ipset)
  87 {
  88         int i = 0;
  89         uint32_t typelist = 0;
  90         struct fw3_ipset_datatype *type;
  91
  92         const char *methods[] = {
  93                 "(bug)",
  94                 "bitmap",
  95                 "hash",
  96                 "list",
  97         };
  98
  99         typelist = 0;
 100
 101         list_for_each_entry(type, &ipset->datatypes, list)
 102         {
 103                 if (i >= 3)
 104                 {
 105                         warn_elem(e, "must not have more than 3 datatypes assigned");
 106                         return false;
 107                 }
 108
 109                 typelist |= (type->type << (i++ * 8));
 110         }
 111
 112         /* find a suitable storage method if none specified */
 113         if (ipset->method == FW3_IPSET_METHOD_UNSPEC)
 114         {
 115                 for (i = 0; i < ARRAY_SIZE(ipset_types); i++)
 116                 {
 117                         if (ipset_types[i].types == typelist)
 118                         {
 119                                 ipset->method = ipset_types[i].method;
 120
 121                                 warn_elem(e, "defines no storage method, assuming '%s'",
 122                                           methods[ipset->method]);
 123
 124                                 break;
 125                         }
 126                 }
 127         }
 128
 129         //typelist |= ipset->method;
 130
 131         for (i = 0; i < ARRAY_SIZE(ipset_types); i++)
 132         {
 133                 if (ipset_types[i].method == ipset->method &&
 134                     ipset_types[i].types == typelist)
 135                 {
 136                         if (!ipset->external || !*ipset->external)
 137                         {
 138                                 if ((ipset_types[i].required & OPT_IPRANGE) &&
 139                                         list_empty(&ipset->iprange))
 140                                 {
 141                                         warn_elem(e, "requires an ip range");
 142                                         return false;
 143                                 }
 144
 145                                 if ((ipset_types[i].required & OPT_PORTRANGE) &&
 146                                     !ipset->portrange.set)
 147                                 {
 148                                         warn_elem(e, "requires a port range");
 149                                         return false;
 150                                 }
 151
 152                                 if (!(ipset_types[i].required & OPT_IPRANGE) &&
 153                                     !list_empty(&ipset->iprange))
 154                                 {
 155                                         warn_elem(e, "iprange ignored");
 156                                         fw3_free_list(&ipset->iprange);
 157                                 }
 158
 159                                 if (!(ipset_types[i].required & OPT_PORTRANGE) &&
 160                                     ipset->portrange.set)
 161                                 {
 162                                         warn_elem(e, "portrange ignored");
 163                                         memset(&ipset->portrange, 0, sizeof(ipset->portrange));
 164                                 }
 165
 166                                 if (!(ipset_types[i].optional & OPT_NETMASK) &&
 167                                     ipset->netmask > 0)
 168                                 {
 169                                         warn_elem(e, "netmask ignored");
 170                                         ipset->netmask = 0;
 171                                 }
 172
 173                                 if (!(ipset_types[i].optional & OPT_HASHSIZE) &&
 174                                     ipset->hashsize > 0)
 175                                 {
 176                                         warn_elem(e, "hashsize ignored");
 177                                         ipset->hashsize = 0;
 178                                 }
 179
 180                                 if (!(ipset_types[i].optional & OPT_MAXELEM) &&
 181                                     ipset->maxelem > 0)
 182                                 {
 183                                         warn_elem(e, "maxelem ignored");
 184                                         ipset->maxelem = 0;
 185                                 }
 186
 187                                 if (!(ipset_types[i].optional & OPT_FAMILY) &&
 188                                     ipset->family != FW3_FAMILY_ANY)
 189                                 {
 190                                         warn_elem(e, "family ignored");
 191                                         ipset->family = FW3_FAMILY_ANY;
 192                                 }
 193                         }
 194
 195                         return true;
 196                 }
 197         }
 198
 199         warn_elem(e, "has an invalid combination of storage method and matches");
 200         return false;
 201 }
 202
 203 struct fw3_ipset *
 204 fw3_alloc_ipset(void)
 205 {
 206         struct fw3_ipset *ipset;
 207
 208         ipset = malloc(sizeof(*ipset));
 209
 210         if (!ipset)
 211                 return NULL;
 212
 213         memset(ipset, 0, sizeof(*ipset));
 214
 215         INIT_LIST_HEAD(&ipset->datatypes);
 216         INIT_LIST_HEAD(&ipset->iprange);
 217
 218         return ipset;
 219 }
 220
 221 void
 222 fw3_load_ipsets(struct fw3_state *state, struct uci_package *p)
 223 {
 224         struct uci_section *s;
 225         struct uci_element *e;
 226         struct fw3_ipset *ipset;
 227
 228         INIT_LIST_HEAD(&state->ipsets);
 229
 230         if (state->disable_ipsets)
 231                 return;
 232
 233         uci_foreach_element(&p->sections, e)
 234         {
 235                 s = uci_to_section(e);
 236
 237                 if (strcmp(s->type, "ipset"))
 238                         continue;
 239
 240                 ipset = fw3_alloc_ipset();
 241
 242                 if (!ipset)
 243                         continue;
 244
 245                 fw3_parse_options(ipset, fw3_ipset_opts, s);
 246
 247                 if (!ipset->name || !*ipset->name)
 248                 {
 249                         warn_elem(e, "must have a name assigned");
 250                 }
 251                 //else if (fw3_lookup_ipset(state, ipset->name) != NULL)
 252                 //{
 253                 //      warn_elem(e, "has duplicated set name '%s'", ipset->name);
 254                 //}
 255                 else if (list_empty(&ipset->datatypes))
 256                 {
 257                         warn_elem(e, "has no datatypes assigned");
 258                 }
 259                 else if (check_types(e, ipset))
 260                 {
 261                         list_add_tail(&ipset->list, &state->ipsets);
 262                         continue;
 263                 }
 264
 265                 fw3_free_ipset(ipset);
 266         }
 267 }
 268
 269
 270 static void
 271 create_ipset(struct fw3_ipset *ipset, struct fw3_state *state)
 272 {
 273         bool first = true;
 274         char s[INET6_ADDRSTRLEN];
 275
 276         struct fw3_ipset_datatype *type;
 277         struct fw3_address *a1, *a2;
 278
 279         const char *methods[] = {
 280                 "(bug)",
 281                 "bitmap",
 282                 "hash",
 283                 "list",
 284         };
 285
 286         const char *types[] = {
 287                 "(bug)",
 288                 "ip",
 289                 "port",
 290                 "mac",
 291                 "net",
 292                 "set",
 293         };
 294
 295         if (ipset->external && *ipset->external)
 296                 return;
 297
 298         info("Creating ipset %s", ipset->name);
 299
 300         first = true;
 301         fw3_pr("create %s %s", ipset->name, methods[ipset->method]);
 302
 303         list_for_each_entry(type, &ipset->datatypes, list)
 304         {
 305                 fw3_pr("%c%s", first ? ':' : ',', types[type->type]);
 306                 first = false;
 307         }
 308
 309         if (!list_empty(&ipset->iprange))
 310         {
 311                 a1 = list_first_entry(&ipset->iprange, struct fw3_address, list);
 312                 a2 = list_last_entry(&ipset->iprange, struct fw3_address, list);
 313
 314                 if (a1 == a2)
 315                 {
 316                         inet_ntop(a1->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 317                                   &a1->address.v6, s, sizeof(s));
 318
 319                         fw3_pr(" range %s/%u", s, a1->mask);
 320                 }
 321                 else if (a1->family == a2->family &&
 322                          fw3_is_family(ipset, a1->family) &&
 323                          fw3_is_family(ipset, a2->family))
 324                 {
 325                         inet_ntop(a1->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 326                                   &a1->address.v6, s, sizeof(s));
 327
 328                         fw3_pr(" range %s", s);
 329
 330                         inet_ntop(a2->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 331                                   &a2->address.v6, s, sizeof(s));
 332
 333                         fw3_pr("-%s", s);
 334                 }
 335         }
 336         else if (ipset->portrange.set)
 337         {
 338                 fw3_pr(" range %u-%u",
 339                        ipset->portrange.port_min, ipset->portrange.port_max);
 340         }
 341
 342         if (ipset->family != FW3_FAMILY_ANY)
 343                 fw3_pr(" family inet%s", (ipset->family == FW3_FAMILY_V4) ? "" : "6");
 344
 345         if (ipset->timeout > 0)
 346                 fw3_pr(" timeout %u", ipset->timeout);
 347
 348         if (ipset->maxelem > 0)
 349                 fw3_pr(" maxelem %u", ipset->maxelem);
 350
 351         if (ipset->netmask > 0)
 352                 fw3_pr(" netmask %u", ipset->netmask);
 353
 354         if (ipset->hashsize > 0)
 355                 fw3_pr(" hashsize %u", ipset->hashsize);
 356
 357         fw3_pr("\n");
 358
 359         fw3_set_running(ipset, &state->running_ipsets);
 360 }
 361
 362 void
 363 fw3_create_ipsets(struct fw3_state *state)
 364 {
 365         struct fw3_ipset *ipset;
 366
 367         if (state->disable_ipsets)
 368                 return;
 369
 370         list_for_each_entry(ipset, &state->ipsets, list)
 371                 if (!fw3_lookup_ipset(state, ipset->name, true))
 372                         create_ipset(ipset, state);
 373
 374         fw3_pr("quit\n");
 375 }
 376
 377 void
 378 fw3_destroy_ipsets(struct fw3_state *state)
 379 {
 380         struct fw3_ipset *s, *tmp;
 381         int mask = (1 << FW3_FAMILY_V4) | (1 << FW3_FAMILY_V6);
 382
 383         list_for_each_entry_safe(s, tmp, &state->running_ipsets, running_list)
 384         {
 385                 if (!hasbit(state->defaults.flags, FW3_FAMILY_V4))
 386                         delbit(s->flags, FW3_FAMILY_V4);
 387
 388                 if (!hasbit(state->defaults.flags, FW3_FAMILY_V6))
 389                         delbit(s->flags, FW3_FAMILY_V6);
 390
 391                 if (!(s->flags & mask))
 392                 {
 393                         info("Deleting ipset %s", s->name);
 394
 395                         fw3_pr("flush %s\n", s->name);
 396                         fw3_pr("destroy %s\n", s->name);
 397
 398                         fw3_set_running(s, NULL);
 399                 }
 400         }
 401 }
 402
 403 struct fw3_ipset *
 404 fw3_lookup_ipset(struct fw3_state *state, const char *name, bool running)
 405 {
 406         struct fw3_ipset *s;
 407
 408         if (list_empty(&state->ipsets))
 409                 return NULL;
 410
 411         list_for_each_entry(s, &state->ipsets, list)
 412         {
 413                 if (strcmp(s->name, name))
 414                         continue;
 415
 416                 if (!running || s->running_list.next)
 417                         return s;
 418
 419                 break;
 420         }
 421
 422         return NULL;
 423 }