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