iptables.h

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
   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_IPTABLES_H
  20 #define __FW3_IPTABLES_H
  21
  22 #define _GNU_SOURCE /* RTLD_NEXT */
  23
  24 #include <libiptc/libiptc.h>
  25 #include <libiptc/libip6tc.h>
  26 #include <xtables.h>
  27
  28 #include <dlfcn.h>
  29 #include <unistd.h>
  30 #include <getopt.h>
  31 #include <sys/utsname.h>
  32
  33 #include "options.h"
  34
  35 #define FW3_ID_MAGIC    0x66773300      /* 'f' 'w' '3' */
  36 #define FW3_ID_MASK             0xffffff00
  37
  38 /* xtables interface */
  39 #if (XTABLES_VERSION_CODE == 10 || XTABLES_VERSION_CODE == 11)
  40 # include "xtables-10.h"
  41 #elif (XTABLES_VERSION_CODE == 5)
  42 # include "xtables-5.h"
  43 #else
  44 # error "Unsupported xtables version"
  45 #endif
  46
  47 #ifndef DISABLE_STATIC_EXTENSIONS
  48 /* libipt*ext.so interfaces */
  49 extern void init_extensions(void);
  50 extern void init_extensions4(void);
  51 extern void init_extensions6(void);
  52 #else
  53 static inline void init_extensions(void) { }
  54 static inline void init_extensions4(void) { }
  55 static inline void init_extensions6(void) { }
  56 #endif
  57
  58 /* Required by certain extensions like SNAT and DNAT */
  59 extern int kernel_version;
  60 void get_kernel_version(void);
  61
  62 struct fw3_ipt_handle {
  63         enum fw3_family family;
  64         enum fw3_table table;
  65         void *handle;
  66 };
  67
  68 struct fw3_ipt_rule {
  69         struct fw3_ipt_handle *h;
  70
  71         union {
  72                 struct ipt_entry e;
  73                 struct ip6t_entry e6;
  74         };
  75
  76         struct xtables_rule_match *matches;
  77         struct xtables_target *target;
  78
  79         int id;
  80
  81         int argc;
  82         char **argv;
  83
  84         uint32_t protocol;
  85         bool protocol_loaded;
  86 };
  87
  88 struct fw3_ipt_handle *fw3_ipt_open(enum fw3_family family,
  89                                     enum fw3_table table);
  90
  91 void fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
  92                         enum fw3_flag policy);
  93
  94
  95 void fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain);
  96 void fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain);
  97
  98 void fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain);
  99
 100 void fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...);
 101
 102 void fw3_ipt_flush(struct fw3_ipt_handle *h);
 103
 104 void fw3_ipt_gc(struct fw3_ipt_handle *h);
 105
 106 void fw3_ipt_commit(struct fw3_ipt_handle *h);
 107
 108 void fw3_ipt_close(struct fw3_ipt_handle *h);
 109
 110 struct fw3_ipt_rule *fw3_ipt_rule_new(struct fw3_ipt_handle *h);
 111
 112 void fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto);
 113
 114 void fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 115                          struct fw3_device *in, struct fw3_device *out);
 116
 117 void fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 118                            struct fw3_address *src, struct fw3_address *dest);
 119
 120 void fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 121                               struct fw3_port *sp, struct fw3_port *dp);
 122
 123 void fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out);
 124
 125 void fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac);
 126
 127 void fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp);
 128
 129 void fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit);
 130
 131 void fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match);
 132
 133 void fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time);
 134
 135 void fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark);
 136
 137 void fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...);
 138
 139 void fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra);
 140
 141 void fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
 142                          const char *k, const char *v);
 143
 144 struct fw3_ipt_rule * fw3_ipt_rule_create(struct fw3_ipt_handle *handle,
 145                                           struct fw3_protocol *proto,
 146                                           struct fw3_device *in,
 147                                           struct fw3_device *out,
 148                                           struct fw3_address *src,
 149                                           struct fw3_address *dest);
 150
 151 void __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl,
 152                            const char *fmt, ...);
 153
 154 #define fw3_ipt_rule_append(rule, ...) \
 155         __fw3_ipt_rule_append(rule, false, __VA_ARGS__)
 156
 157 #define fw3_ipt_rule_replace(rule, ...) \
 158         __fw3_ipt_rule_append(rule, true, __VA_ARGS__)
 159
 160 static inline void
 161 fw3_ipt_rule_target(struct fw3_ipt_rule *r, const char *fmt, ...)
 162 {
 163         va_list ap;
 164         char buf[32];
 165
 166         va_start(ap, fmt);
 167         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 168         va_end(ap);
 169
 170         fw3_ipt_rule_addarg(r, false, "-j", buf);
 171 }
 172
 173 void xtables_register_match(struct xtables_match *me);
 174 void xtables_register_target(struct xtables_target *me);
 175
 176 #endif