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