options.h

   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 #ifndef __FW3_OPTIONS_H
  20 #define __FW3_OPTIONS_H
  21
  22
  23 #include <errno.h>
  24
  25 #include <stdlib.h>
  26 #include <stdarg.h>
  27 #include <stdbool.h>
  28
  29 #include <ctype.h>
  30 #include <string.h>
  31
  32 #include <netdb.h>
  33 #include <arpa/inet.h>
  34 #include <sys/socket.h>
  35 #include <netinet/in.h>
  36 #include <netinet/ether.h>
  37
  38 #include <time.h>
  39
  40 #include <uci.h>
  41
  42 #include <libubox/list.h>
  43 #include <libubox/utils.h>
  44
  45 #include "icmp_codes.h"
  46 #include "utils.h"
  47
  48
  49 enum fw3_table
  50 {
  51         FW3_TABLE_FILTER = 0,
  52         FW3_TABLE_NAT    = 1,
  53         FW3_TABLE_MANGLE = 2,
  54         FW3_TABLE_RAW    = 3,
  55 };
  56
  57 enum fw3_family
  58 {
  59         FW3_FAMILY_ANY = 0,
  60         FW3_FAMILY_V4  = 4,
  61         FW3_FAMILY_V6  = 5,
  62 };
  63
  64 enum fw3_target
  65 {
  66         FW3_TARGET_UNSPEC        = 0,
  67         FW3_TARGET_ACCEPT        = 6,
  68         FW3_TARGET_REJECT        = 7,
  69         FW3_TARGET_DROP          = 8,
  70         FW3_TARGET_NOTRACK       = 9,
  71         FW3_TARGET_DNAT          = 10,
  72         FW3_TARGET_SNAT          = 11,
  73         FW3_TARGET_SRC_ACCEPT    = 12,
  74         FW3_TARGET_SRC_REJECT    = 13,
  75         FW3_TARGET_SRC_DROP      = 14,
  76         FW3_TARGET_CUSTOM_CHAINS = 15,
  77 };
  78
  79 enum fw3_default
  80 {
  81         FW3_DEFAULT_UNSPEC        = 0,
  82         FW3_DEFAULT_CUSTOM_CHAINS = 16,
  83         FW3_DEFAULT_SYN_FLOOD     = 17,
  84         FW3_DEFAULT_MTU_FIX       = 18,
  85         FW3_DEFAULT_DROP_INVALID  = 19,
  86 };
  87
  88 extern const char *fw3_flag_names[FW3_DEFAULT_DROP_INVALID + 1];
  89
  90
  91 enum fw3_limit_unit
  92 {
  93         FW3_LIMIT_UNIT_SECOND = 0,
  94         FW3_LIMIT_UNIT_MINUTE = 1,
  95         FW3_LIMIT_UNIT_HOUR   = 2,
  96         FW3_LIMIT_UNIT_DAY    = 3,
  97 };
  98
  99 enum fw3_ipset_method
 100 {
 101         FW3_IPSET_METHOD_UNSPEC = 0,
 102         FW3_IPSET_METHOD_BITMAP = 1,
 103         FW3_IPSET_METHOD_HASH   = 2,
 104         FW3_IPSET_METHOD_LIST   = 3,
 105 };
 106
 107 enum fw3_ipset_type
 108 {
 109         FW3_IPSET_TYPE_UNSPEC = 0,
 110         FW3_IPSET_TYPE_IP     = 1,
 111         FW3_IPSET_TYPE_PORT   = 2,
 112         FW3_IPSET_TYPE_MAC    = 3,
 113         FW3_IPSET_TYPE_NET    = 4,
 114         FW3_IPSET_TYPE_SET    = 5,
 115 };
 116
 117 enum fw3_include_type
 118 {
 119         FW3_INC_TYPE_SCRIPT   = 0,
 120         FW3_INC_TYPE_RESTORE  = 1,
 121 };
 122
 123 struct fw3_ipset_datatype
 124 {
 125         struct list_head list;
 126         enum fw3_ipset_type type;
 127         bool dest;
 128 };
 129
 130 struct fw3_device
 131 {
 132         struct list_head list;
 133
 134         bool set;
 135         bool any;
 136         bool invert;
 137         char name[32];
 138 };
 139
 140 struct fw3_address
 141 {
 142         struct list_head list;
 143
 144         bool set;
 145         bool range;
 146         bool invert;
 147         enum fw3_family family;
 148         int mask;
 149         union {
 150                 struct in_addr v4;
 151                 struct in6_addr v6;
 152                 struct ether_addr mac;
 153         } address;
 154         union {
 155                 struct in_addr v4;
 156                 struct in6_addr v6;
 157                 struct ether_addr mac;
 158         } address2;
 159 };
 160
 161 struct fw3_mac
 162 {
 163         struct list_head list;
 164
 165         bool set;
 166         bool invert;
 167         struct ether_addr mac;
 168 };
 169
 170 struct fw3_protocol
 171 {
 172         struct list_head list;
 173
 174         bool any;
 175         bool invert;
 176         uint32_t protocol;
 177 };
 178
 179 struct fw3_port
 180 {
 181         struct list_head list;
 182
 183         bool set;
 184         bool invert;
 185         uint16_t port_min;
 186         uint16_t port_max;
 187 };
 188
 189 struct fw3_icmptype
 190 {
 191         struct list_head list;
 192
 193         bool invert;
 194         enum fw3_family family;
 195         uint8_t type;
 196         uint8_t code_min;
 197         uint8_t code_max;
 198         uint8_t type6;
 199         uint8_t code6_min;
 200         uint8_t code6_max;
 201 };
 202
 203 struct fw3_limit
 204 {
 205         bool invert;
 206         int rate;
 207         int burst;
 208         enum fw3_limit_unit unit;
 209 };
 210
 211 struct fw3_time
 212 {
 213         bool utc;
 214         struct tm datestart;
 215         struct tm datestop;
 216         uint32_t timestart;
 217         uint32_t timestop;
 218         uint32_t monthdays; /* bit 0 is invert + 1 .. 31 */
 219         uint8_t weekdays;   /* bit 0 is invert + 1 .. 7 */
 220 };
 221
 222 struct fw3_defaults
 223 {
 224         enum fw3_target policy_input;
 225         enum fw3_target policy_output;
 226         enum fw3_target policy_forward;
 227
 228         bool drop_invalid;
 229
 230         bool syn_flood;
 231         struct fw3_limit syn_flood_rate;
 232
 233         bool tcp_syncookies;
 234         bool tcp_ecn;
 235         bool tcp_window_scaling;
 236
 237         bool accept_redirects;
 238         bool accept_source_route;
 239
 240         bool custom_chains;
 241
 242         bool disable_ipv6;
 243
 244         uint32_t flags[2];
 245 };
 246
 247 struct fw3_zone
 248 {
 249         struct list_head list;
 250         struct list_head running_list;
 251
 252         bool enabled;
 253         const char *name;
 254
 255         enum fw3_family family;
 256
 257         enum fw3_target policy_input;
 258         enum fw3_target policy_output;
 259         enum fw3_target policy_forward;
 260
 261         struct list_head networks;
 262         struct list_head devices;
 263         struct list_head subnets;
 264
 265         const char *extra_src;
 266         const char *extra_dest;
 267
 268         bool masq;
 269         struct list_head masq_src;
 270         struct list_head masq_dest;
 271
 272         bool conntrack;
 273         bool mtu_fix;
 274
 275         bool log;
 276         struct fw3_limit log_limit;
 277
 278         bool custom_chains;
 279
 280         uint32_t flags[2];
 281 };
 282
 283 struct fw3_rule
 284 {
 285         struct list_head list;
 286
 287         bool enabled;
 288         const char *name;
 289
 290         enum fw3_family family;
 291
 292         struct fw3_zone *_src;
 293         struct fw3_zone *_dest;
 294
 295         struct fw3_device src;
 296         struct fw3_device dest;
 297
 298         struct fw3_ipset *_ipset;
 299         struct fw3_device ipset;
 300
 301         struct list_head proto;
 302
 303         struct list_head ip_src;
 304         struct list_head mac_src;
 305         struct list_head port_src;
 306
 307         struct list_head ip_dest;
 308         struct list_head port_dest;
 309
 310         struct list_head icmp_type;
 311
 312         struct fw3_limit limit;
 313         struct fw3_time time;
 314
 315         enum fw3_target target;
 316
 317         const char *extra;
 318 };
 319
 320 struct fw3_redirect
 321 {
 322         struct list_head list;
 323
 324         bool enabled;
 325         const char *name;
 326
 327         enum fw3_family family;
 328
 329         struct fw3_zone *_src;
 330         struct fw3_zone *_dest;
 331
 332         struct fw3_device src;
 333         struct fw3_device dest;
 334
 335         struct fw3_ipset *_ipset;
 336         struct fw3_device ipset;
 337
 338         struct list_head proto;
 339
 340         struct fw3_address ip_src;
 341         struct list_head mac_src;
 342         struct fw3_port port_src;
 343
 344         struct fw3_address ip_dest;
 345         struct fw3_port port_dest;
 346
 347         struct fw3_address ip_redir;
 348         struct fw3_port port_redir;
 349
 350         struct fw3_time time;
 351
 352         enum fw3_target target;
 353
 354         const char *extra;
 355
 356         bool reflection;
 357 };
 358
 359 struct fw3_forward
 360 {
 361         struct list_head list;
 362
 363         bool enabled;
 364         const char *name;
 365
 366         enum fw3_family family;
 367
 368         struct fw3_zone *_src;
 369         struct fw3_zone *_dest;
 370
 371         struct fw3_device src;
 372         struct fw3_device dest;
 373 };
 374
 375 struct fw3_ipset
 376 {
 377         struct list_head list;
 378         struct list_head running_list;
 379
 380         bool enabled;
 381         const char *name;
 382         enum fw3_family family;
 383
 384         enum fw3_ipset_method method;
 385         struct list_head datatypes;
 386
 387         struct fw3_address iprange;
 388         struct fw3_port portrange;
 389
 390         int netmask;
 391         int maxelem;
 392         int hashsize;
 393
 394         int timeout;
 395
 396         const char *external;
 397
 398         uint32_t flags[2];
 399 };
 400
 401 struct fw3_include
 402 {
 403         struct list_head list;
 404         struct list_head running_list;
 405
 406         bool enabled;
 407         const char *name;
 408         enum fw3_family family;
 409
 410         const char *path;
 411         enum fw3_include_type type;
 412 };
 413
 414 struct fw3_state
 415 {
 416         struct uci_context *uci;
 417         struct fw3_defaults defaults;
 418         struct list_head zones;
 419         struct list_head rules;
 420         struct list_head redirects;
 421         struct list_head forwards;
 422         struct list_head ipsets;
 423         struct list_head includes;
 424
 425         struct list_head running_zones;
 426         struct list_head running_ipsets;
 427
 428         bool disable_ipsets;
 429         bool statefile;
 430 };
 431
 432
 433 struct fw3_option
 434 {
 435         const char *name;
 436         bool (*parse)(void *, const char *);
 437         uintptr_t offset;
 438         size_t elem_size;
 439 };
 440
 441 #define FW3_OPT(name, parse, structure, member) \
 442         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member) }
 443
 444 #define FW3_LIST(name, parse, structure, member) \
 445         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member), \
 446           sizeof(struct fw3_##structure) }
 447
 448
 449 bool fw3_parse_bool(void *ptr, const char *val);
 450 bool fw3_parse_int(void *ptr, const char *val);
 451 bool fw3_parse_string(void *ptr, const char *val);
 452 bool fw3_parse_target(void *ptr, const char *val);
 453 bool fw3_parse_limit(void *ptr, const char *val);
 454 bool fw3_parse_device(void *ptr, const char *val);
 455 bool fw3_parse_address(void *ptr, const char *val);
 456 bool fw3_parse_mac(void *ptr, const char *val);
 457 bool fw3_parse_port(void *ptr, const char *val);
 458 bool fw3_parse_family(void *ptr, const char *val);
 459 bool fw3_parse_icmptype(void *ptr, const char *val);
 460 bool fw3_parse_protocol(void *ptr, const char *val);
 461
 462 bool fw3_parse_ipset_method(void *ptr, const char *val);
 463 bool fw3_parse_ipset_datatype(void *ptr, const char *val);
 464
 465 bool fw3_parse_include_type(void *ptr, const char *val);
 466
 467 bool fw3_parse_date(void *ptr, const char *val);
 468 bool fw3_parse_time(void *ptr, const char *val);
 469 bool fw3_parse_weekdays(void *ptr, const char *val);
 470 bool fw3_parse_monthdays(void *ptr, const char *val);
 471
 472 void fw3_parse_options(void *s, const struct fw3_option *opts,
 473                        struct uci_section *section);
 474
 475 void fw3_format_in_out(struct fw3_device *in, struct fw3_device *out);
 476 void fw3_format_src_dest(struct fw3_address *src, struct fw3_address *dest);
 477 void fw3_format_sport_dport(struct fw3_port *sp, struct fw3_port *dp);
 478 void fw3_format_mac(struct fw3_mac *mac);
 479 void fw3_format_protocol(struct fw3_protocol *proto, enum fw3_family family);
 480 void fw3_format_icmptype(struct fw3_icmptype *icmp, enum fw3_family family);
 481 void fw3_format_limit(struct fw3_limit *limit);
 482 void fw3_format_ipset(struct fw3_ipset *ipset, bool invert);
 483 void fw3_format_time(struct fw3_time *time);
 484
 485 void __fw3_format_comment(const char *comment, ...);
 486 #define fw3_format_comment(...) __fw3_format_comment(__VA_ARGS__, NULL)
 487
 488 void fw3_format_extra(const char *extra);
 489
 490 #endif