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