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 #ifndef DISABLE_STATIC_EXTENSIONS
  23 /* libipt*ext.so interfaces */
  24 extern void init_extensions(void);
  25 extern void init_extensions4(void);
  26 extern void init_extensions6(void);
  27 #else
  28 static inline void init_extensions(void) { }
  29 static inline void init_extensions4(void) { }
  30 static inline void init_extensions6(void) { }
  31 #endif
  32
  33 /* Required by certain extensions like SNAT and DNAT */
  34 extern int kernel_version;
  35 void get_kernel_version(void);
  36
  37 struct fw3_ipt_handle {
  38         enum fw3_family family;
  39         enum fw3_table table;
  40         void *handle;
  41 };
  42
  43 struct fw3_ipt_rule;
  44
  45 struct fw3_ipt_handle *fw3_ipt_open(enum fw3_family family,
  46                                     enum fw3_table table);
  47
  48 void fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
  49                         enum fw3_flag policy);
  50
  51
  52 void fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain);
  53 void fw3_ipt_delete_chain(struct fw3_ipt_handle *h, bool if_unused,
  54                           const char *chain);
  55
  56 void fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain);
  57
  58 void fw3_ipt_create_chain(struct fw3_ipt_handle *h, bool ignore_existing,
  59                           const char *chain);
  60
  61 void fw3_ipt_flush(struct fw3_ipt_handle *h);
  62
  63 void fw3_ipt_gc(struct fw3_ipt_handle *h);
  64
  65 void fw3_ipt_commit(struct fw3_ipt_handle *h);
  66
  67 void fw3_ipt_close(struct fw3_ipt_handle *h);
  68
  69 struct fw3_ipt_rule *fw3_ipt_rule_new(struct fw3_ipt_handle *h);
  70
  71 void fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto);
  72
  73 void fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
  74                          struct fw3_device *in, struct fw3_device *out);
  75
  76 void fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
  77                            struct fw3_address *src, struct fw3_address *dest);
  78
  79 void fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
  80                               struct fw3_port *sp, struct fw3_port *dp);
  81
  82 void fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out);
  83
  84 void fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac);
  85
  86 void fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp);
  87
  88 void fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit);
  89
  90 void fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match);
  91
  92 void fw3_ipt_rule_helper(struct fw3_ipt_rule *r, struct fw3_cthelpermatch *match);
  93
  94 void fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time);
  95
  96 void fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark);
  97
  98 void fw3_ipt_rule_dscp(struct fw3_ipt_rule *r, struct fw3_dscp *dscp);
  99
 100 void fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...);
 101
 102 void fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra);
 103
 104 void fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
 105                          const char *k, const char *v);
 106
 107 struct fw3_ipt_rule * fw3_ipt_rule_create(struct fw3_ipt_handle *handle,
 108                                           struct fw3_protocol *proto,
 109                                           struct fw3_device *in,
 110                                           struct fw3_device *out,
 111                                           struct fw3_address *src,
 112                                           struct fw3_address *dest);
 113
 114 void __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl,
 115                            const char *fmt, ...);
 116
 117 #define fw3_ipt_rule_append(rule, ...) \
 118         __fw3_ipt_rule_append(rule, false, __VA_ARGS__)
 119
 120 #define fw3_ipt_rule_replace(rule, ...) \
 121         __fw3_ipt_rule_append(rule, true, __VA_ARGS__)
 122
 123 static inline void
 124 fw3_ipt_rule_target(struct fw3_ipt_rule *r, const char *fmt, ...)
 125 {
 126         va_list ap;
 127         char buf[32];
 128
 129         va_start(ap, fmt);
 130         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 131         va_end(ap);
 132
 133         fw3_ipt_rule_addarg(r, false, "-j", buf);
 134 }
 135
 136 #endif