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         int libc;
  60         void **libv;
  61 };
  62
  63 struct fw3_ipt_rule {
  64         struct fw3_ipt_handle *h;
  65
  66         union {
  67                 struct ipt_entry e;
  68                 struct ip6t_entry e6;
  69         };
  70
  71         struct xtables_rule_match *matches;
  72         struct xtables_target *target;
  73
  74         int id;
  75
  76         int argc;
  77         char **argv;
  78
  79         uint32_t protocol;
  80         bool protocol_loaded;
  81 };
  82
  83 struct fw3_ipt_handle *fw3_ipt_open(enum fw3_family family,
  84                                     enum fw3_table table);
  85
  86 void fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
  87                         enum fw3_flag policy);
  88
  89
  90 void fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain);
  91 void fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain);
  92
  93 void fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain);
  94
  95 void fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...);
  96
  97 void fw3_ipt_flush(struct fw3_ipt_handle *h);
  98
  99 void fw3_ipt_gc(struct fw3_ipt_handle *h);
 100
 101 void fw3_ipt_commit(struct fw3_ipt_handle *h);
 102
 103 void fw3_ipt_close(struct fw3_ipt_handle *h);
 104
 105 struct fw3_ipt_rule *fw3_ipt_rule_new(struct fw3_ipt_handle *h);
 106
 107 void fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto);
 108
 109 void fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 110                          struct fw3_device *in, struct fw3_device *out);
 111
 112 void fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 113                            struct fw3_address *src, struct fw3_address *dest);
 114
 115 void fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 116                               struct fw3_port *sp, struct fw3_port *dp);
 117
 118 void fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out);
 119
 120 void fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac);
 121
 122 void fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp);
 123
 124 void fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit);
 125
 126 void fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match);
 127
 128 void fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time);
 129
 130 void fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark);
 131
 132 void fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...);
 133
 134 void fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra);
 135
 136 void fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
 137                          const char *k, const char *v);
 138
 139 struct fw3_ipt_rule * fw3_ipt_rule_create(struct fw3_ipt_handle *handle,
 140                                           struct fw3_protocol *proto,
 141                                           struct fw3_device *in,
 142                                           struct fw3_device *out,
 143                                           struct fw3_address *src,
 144                                           struct fw3_address *dest);
 145
 146 void __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl,
 147                            const char *fmt, ...);
 148
 149 #define fw3_ipt_rule_append(rule, ...) \
 150         __fw3_ipt_rule_append(rule, false, __VA_ARGS__)
 151
 152 #define fw3_ipt_rule_replace(rule, ...) \
 153         __fw3_ipt_rule_append(rule, true, __VA_ARGS__)
 154
 155 static inline void
 156 fw3_ipt_rule_target(struct fw3_ipt_rule *r, const char *fmt, ...)
 157 {
 158         va_list ap;
 159         char buf[32];
 160
 161         va_start(ap, fmt);
 162         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 163         va_end(ap);
 164
 165         fw3_ipt_rule_addarg(r, false, "-j", buf);
 166 }
 167
 168 #endif