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_CNS_V4 = 15,
  77         FW3_TARGET_CUSTOM_CNS_V6 = 16,
  78 };
  79
  80 enum fw3_default
  81 {
  82         FW3_DEFAULT_UNSPEC        = 0,
  83         FW3_DEFAULT_CUSTOM_CHAINS = 17,
  84         FW3_DEFAULT_SYN_FLOOD     = 18,
  85         FW3_DEFAULT_MTU_FIX       = 19,
  86         FW3_DEFAULT_DROP_INVALID  = 20,
  87 };
  88
  89 extern const char *fw3_flag_names[FW3_DEFAULT_DROP_INVALID + 1];
  90
  91
  92 enum fw3_limit_unit
  93 {
  94         FW3_LIMIT_UNIT_SECOND = 0,
  95         FW3_LIMIT_UNIT_MINUTE = 1,
  96         FW3_LIMIT_UNIT_HOUR   = 2,
  97         FW3_LIMIT_UNIT_DAY    = 3,
  98 };
  99
 100 enum fw3_ipset_method
 101 {
 102         FW3_IPSET_METHOD_UNSPEC = 0,
 103         FW3_IPSET_METHOD_BITMAP = 1,
 104         FW3_IPSET_METHOD_HASH   = 2,
 105         FW3_IPSET_METHOD_LIST   = 3,
 106 };
 107
 108 enum fw3_ipset_type
 109 {
 110         FW3_IPSET_TYPE_UNSPEC = 0,
 111         FW3_IPSET_TYPE_IP     = 1,
 112         FW3_IPSET_TYPE_PORT   = 2,
 113         FW3_IPSET_TYPE_MAC    = 3,
 114         FW3_IPSET_TYPE_NET    = 4,
 115         FW3_IPSET_TYPE_SET    = 5,
 116 };
 117
 118 enum fw3_include_type
 119 {
 120         FW3_INC_TYPE_SCRIPT   = 0,
 121         FW3_INC_TYPE_RESTORE  = 1,
 122 };
 123
 124 struct fw3_ipset_datatype
 125 {
 126         struct list_head list;
 127         enum fw3_ipset_type type;
 128         bool dest;
 129 };
 130
 131 struct fw3_device
 132 {
 133         struct list_head list;
 134
 135         bool set;
 136         bool any;
 137         bool invert;
 138         char name[32];
 139 };
 140
 141 struct fw3_address
 142 {
 143         struct list_head list;
 144
 145         bool set;
 146         bool range;
 147         bool invert;
 148         enum fw3_family family;
 149         int mask;
 150         union {
 151                 struct in_addr v4;
 152                 struct in6_addr v6;
 153                 struct ether_addr mac;
 154         } address;
 155         union {
 156                 struct in_addr v4;
 157                 struct in6_addr v6;
 158                 struct ether_addr mac;
 159         } address2;
 160 };
 161
 162 struct fw3_mac
 163 {
 164         struct list_head list;
 165
 166         bool set;
 167         bool invert;
 168         struct ether_addr mac;
 169 };
 170
 171 struct fw3_protocol
 172 {
 173         struct list_head list;
 174
 175         bool any;
 176         bool invert;
 177         uint32_t protocol;
 178 };
 179
 180 struct fw3_port
 181 {
 182         struct list_head list;
 183
 184         bool set;
 185         bool invert;
 186         uint16_t port_min;
 187         uint16_t port_max;
 188 };
 189
 190 struct fw3_icmptype
 191 {
 192         struct list_head list;
 193
 194         bool invert;
 195         enum fw3_family family;
 196         uint8_t type;
 197         uint8_t code_min;
 198         uint8_t code_max;
 199         uint8_t type6;
 200         uint8_t code6_min;
 201         uint8_t code6_max;
 202 };
 203
 204 struct fw3_limit
 205 {
 206         bool invert;
 207         int rate;
 208         int burst;
 209         enum fw3_limit_unit unit;
 210 };
 211
 212 struct fw3_time
 213 {
 214         bool utc;
 215         struct tm datestart;
 216         struct tm datestop;
 217         uint32_t timestart;
 218         uint32_t timestop;
 219         uint32_t monthdays; /* bit 0 is invert + 1 .. 31 */
 220         uint8_t weekdays;   /* bit 0 is invert + 1 .. 7 */
 221 };
 222
 223 struct fw3_defaults
 224 {
 225         enum fw3_target policy_input;
 226         enum fw3_target policy_output;
 227         enum fw3_target policy_forward;
 228
 229         bool drop_invalid;
 230
 231         bool syn_flood;
 232         struct fw3_limit syn_flood_rate;
 233
 234         bool tcp_syncookies;
 235         bool tcp_ecn;
 236         bool tcp_window_scaling;
 237
 238         bool accept_redirects;
 239         bool accept_source_route;
 240
 241         bool custom_chains;
 242
 243         bool disable_ipv6;
 244
 245         uint32_t flags;
 246         uint32_t running_flags;
 247 };
 248
 249 struct fw3_zone
 250 {
 251         struct list_head list;
 252         struct list_head running_list;
 253
 254         bool enabled;
 255         const char *name;
 256
 257         enum fw3_family family;
 258
 259         enum fw3_target policy_input;
 260         enum fw3_target policy_output;
 261         enum fw3_target policy_forward;
 262
 263         struct list_head networks;
 264         struct list_head devices;
 265         struct list_head subnets;
 266
 267         const char *extra_src;
 268         const char *extra_dest;
 269
 270         bool masq;
 271         struct list_head masq_src;
 272         struct list_head masq_dest;
 273
 274         bool conntrack;
 275         bool mtu_fix;
 276
 277         bool log;
 278         struct fw3_limit log_limit;
 279
 280         bool custom_chains;
 281
 282         uint32_t src_flags;
 283         uint32_t dst_flags;
 284
 285         uint32_t running_src_flags;
 286         uint32_t running_dst_flags;
 287 };
 288
 289 struct fw3_rule
 290 {
 291         struct list_head list;
 292
 293         bool enabled;
 294         const char *name;
 295
 296         enum fw3_family family;
 297
 298         struct fw3_zone *_src;
 299         struct fw3_zone *_dest;
 300
 301         struct fw3_device src;
 302         struct fw3_device dest;
 303
 304         struct fw3_ipset *_ipset;
 305         struct fw3_device ipset;
 306
 307         struct list_head proto;
 308
 309         struct list_head ip_src;
 310         struct list_head mac_src;
 311         struct list_head port_src;
 312
 313         struct list_head ip_dest;
 314         struct list_head port_dest;
 315
 316         struct list_head icmp_type;
 317
 318         struct fw3_limit limit;
 319         struct fw3_time time;
 320
 321         enum fw3_target target;
 322
 323         const char *extra;
 324 };
 325
 326 struct fw3_redirect
 327 {
 328         struct list_head list;
 329
 330         bool enabled;
 331         const char *name;
 332
 333         enum fw3_family family;
 334
 335         struct fw3_zone *_src;
 336         struct fw3_zone *_dest;
 337
 338         struct fw3_device src;
 339         struct fw3_device dest;
 340
 341         struct fw3_ipset *_ipset;
 342         struct fw3_device ipset;
 343
 344         struct list_head proto;
 345
 346         struct fw3_address ip_src;
 347         struct list_head mac_src;
 348         struct fw3_port port_src;
 349
 350         struct fw3_address ip_dest;
 351         struct fw3_port port_dest;
 352
 353         struct fw3_address ip_redir;
 354         struct fw3_port port_redir;
 355
 356         struct fw3_time time;
 357
 358         enum fw3_target target;
 359
 360         const char *extra;
 361
 362         bool reflection;
 363 };
 364
 365 struct fw3_forward
 366 {
 367         struct list_head list;
 368
 369         bool enabled;
 370         const char *name;
 371
 372         enum fw3_family family;
 373
 374         struct fw3_zone *_src;
 375         struct fw3_zone *_dest;
 376
 377         struct fw3_device src;
 378         struct fw3_device dest;
 379 };
 380
 381 struct fw3_ipset
 382 {
 383         struct list_head list;
 384         struct list_head running_list;
 385
 386         bool enabled;
 387         const char *name;
 388         enum fw3_family family;
 389
 390         enum fw3_ipset_method method;
 391         struct list_head datatypes;
 392
 393         struct fw3_address iprange;
 394         struct fw3_port portrange;
 395
 396         int netmask;
 397         int maxelem;
 398         int hashsize;
 399
 400         int timeout;
 401
 402         const char *external;
 403
 404         uint32_t flags;
 405         uint32_t running_flags;
 406 };
 407
 408 struct fw3_include
 409 {
 410         struct list_head list;
 411         struct list_head running_list;
 412
 413         bool enabled;
 414         const char *name;
 415         enum fw3_family family;
 416
 417         const char *path;
 418         enum fw3_include_type type;
 419 };
 420
 421 struct fw3_state
 422 {
 423         struct uci_context *uci;
 424         struct fw3_defaults defaults;
 425         struct list_head zones;
 426         struct list_head rules;
 427         struct list_head redirects;
 428         struct list_head forwards;
 429         struct list_head ipsets;
 430         struct list_head includes;
 431
 432         struct list_head running_zones;
 433         struct list_head running_ipsets;
 434
 435         bool disable_ipsets;
 436         bool statefile;
 437 };
 438
 439
 440 struct fw3_option
 441 {
 442         const char *name;
 443         bool (*parse)(void *, const char *);
 444         uintptr_t offset;
 445         size_t elem_size;
 446 };
 447
 448 #define FW3_OPT(name, parse, structure, member) \
 449         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member) }
 450
 451 #define FW3_LIST(name, parse, structure, member) \
 452         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member), \
 453           sizeof(struct fw3_##structure) }
 454
 455
 456 bool fw3_parse_bool(void *ptr, const char *val);
 457 bool fw3_parse_int(void *ptr, const char *val);
 458 bool fw3_parse_string(void *ptr, const char *val);
 459 bool fw3_parse_target(void *ptr, const char *val);
 460 bool fw3_parse_limit(void *ptr, const char *val);
 461 bool fw3_parse_device(void *ptr, const char *val);
 462 bool fw3_parse_address(void *ptr, const char *val);
 463 bool fw3_parse_mac(void *ptr, const char *val);
 464 bool fw3_parse_port(void *ptr, const char *val);
 465 bool fw3_parse_family(void *ptr, const char *val);
 466 bool fw3_parse_icmptype(void *ptr, const char *val);
 467 bool fw3_parse_protocol(void *ptr, const char *val);
 468
 469 bool fw3_parse_ipset_method(void *ptr, const char *val);
 470 bool fw3_parse_ipset_datatype(void *ptr, const char *val);
 471
 472 bool fw3_parse_include_type(void *ptr, const char *val);
 473
 474 bool fw3_parse_date(void *ptr, const char *val);
 475 bool fw3_parse_time(void *ptr, const char *val);
 476 bool fw3_parse_weekdays(void *ptr, const char *val);
 477 bool fw3_parse_monthdays(void *ptr, const char *val);
 478
 479 void fw3_parse_options(void *s, const struct fw3_option *opts,
 480                        struct uci_section *section);
 481
 482 void fw3_format_in_out(struct fw3_device *in, struct fw3_device *out);
 483 void fw3_format_src_dest(struct fw3_address *src, struct fw3_address *dest);
 484 void fw3_format_sport_dport(struct fw3_port *sp, struct fw3_port *dp);
 485 void fw3_format_mac(struct fw3_mac *mac);
 486 void fw3_format_protocol(struct fw3_protocol *proto, enum fw3_family family);
 487 void fw3_format_icmptype(struct fw3_icmptype *icmp, enum fw3_family family);
 488 void fw3_format_limit(struct fw3_limit *limit);
 489 void fw3_format_ipset(struct fw3_ipset *ipset, bool invert);
 490 void fw3_format_time(struct fw3_time *time);
 491
 492 void __fw3_format_comment(const char *comment, ...);
 493 #define fw3_format_comment(...) __fw3_format_comment(__VA_ARGS__, NULL)
 494
 495 void fw3_format_extra(const char *extra);
 496
 497 #endif