iptables.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_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 <unistd.h>
  27 #include <getopt.h>
  28 #include <sys/utsname.h>
  29
  30 #include "options.h"
  31
  32 /* xtables interface */
  33 #if (XTABLES_VERSION_CODE == 10)
  34 # include "xtables-10.h"
  35 #elif (XTABLES_VERSION_CODE == 5)
  36 # include "xtables-5.h"
  37 #else
  38 # error "Unsupported xtables version"
  39 #endif
  40
  41 /* libext.a interface */
  42 #define FW3_IPT_MODULES                 \
  43         __ipt_module(comment)           \
  44         __ipt_module(conntrack)         \
  45         __ipt_module(icmp)                      \
  46         __ipt_module(icmp6)                     \
  47         __ipt_module(limit)                     \
  48         __ipt_module(mac)                       \
  49         __ipt_module(mark)                      \
  50         __ipt_module(set)                       \
  51         __ipt_module(standard)          \
  52         __ipt_module(tcp)                       \
  53         __ipt_module(time)                      \
  54         __ipt_module(udp)                       \
  55         __ipt_module(CT)                        \
  56         __ipt_module(DNAT)                      \
  57         __ipt_module(LOG)                       \
  58         __ipt_module(MARK)                      \
  59         __ipt_module(MASQUERADE)        \
  60         __ipt_module(REDIRECT)          \
  61         __ipt_module(REJECT)            \
  62         __ipt_module(SET)                       \
  63         __ipt_module(SNAT)                      \
  64         __ipt_module(TCPMSS)
  65
  66 #undef __ipt_module
  67 #define __ipt_module(x) \
  68         extern void libxt_##x##_init(void) __attribute__((weak)); \
  69         extern void libipt_##x##_init(void) __attribute__((weak)); \
  70         extern void libip6t_##x##_init(void) __attribute__((weak));
  71
  72 FW3_IPT_MODULES
  73
  74
  75 /* Required by certain extensions like SNAT and DNAT */
  76 extern int kernel_version;
  77 void get_kernel_version(void);
  78
  79 struct fw3_ipt_handle {
  80         enum fw3_family family;
  81         enum fw3_table table;
  82         void *handle;
  83 };
  84
  85 struct fw3_ipt_rule {
  86         struct fw3_ipt_handle *h;
  87
  88         union {
  89                 struct ipt_entry e;
  90                 struct ip6t_entry e6;
  91         };
  92
  93         struct xtables_rule_match *matches;
  94         struct xtables_target *target;
  95
  96         int argc;
  97         char **argv;
  98
  99         uint32_t protocol;
 100         bool protocol_loaded;
 101 };
 102
 103 struct fw3_ipt_handle *fw3_ipt_open(enum fw3_family family,
 104                                     enum fw3_table table);
 105
 106 void fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
 107                         enum fw3_flag policy);
 108
 109 void fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain);
 110 void fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target);
 111
 112 void fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...);
 113
 114 void fw3_ipt_flush(struct fw3_ipt_handle *h);
 115
 116 void fw3_ipt_commit(struct fw3_ipt_handle *h);
 117
 118 struct fw3_ipt_rule *fw3_ipt_rule_new(struct fw3_ipt_handle *h);
 119
 120 void fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto);
 121
 122 void fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 123                          struct fw3_device *in, struct fw3_device *out);
 124
 125 void fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 126                            struct fw3_address *src, struct fw3_address *dest);
 127
 128 void fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 129                               struct fw3_port *sp, struct fw3_port *dp);
 130
 131 void fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac);
 132
 133 void fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp);
 134
 135 void fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit);
 136
 137 void fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_ipset *ipset,
 138                         bool invert);
 139
 140 void fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time);
 141
 142 void fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark);
 143
 144 void fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...);
 145
 146 void fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra);
 147
 148 void fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
 149                          const char *k, const char *v);
 150
 151 struct fw3_ipt_rule * fw3_ipt_rule_create(struct fw3_ipt_handle *handle,
 152                                           struct fw3_protocol *proto,
 153                                           struct fw3_device *in,
 154                                           struct fw3_device *out,
 155                                           struct fw3_address *src,
 156                                           struct fw3_address *dest);
 157
 158 void fw3_ipt_rule_append(struct fw3_ipt_rule *r, const char *fmt, ...);
 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 #endif