1/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> 2 * Patrick Schaaf <bof@bof.de> 3 * Martin Josefsson <gandalf@wlug.westbo.se> 4 * Copyright (C) 2003-2004 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11/* Shared library add-on to iptables to add IP set mangling target. */ 12#include <stdio.h> 13#include <netdb.h> 14#include <string.h> 15#include <stdlib.h> 16#include <getopt.h> 17#include <ctype.h> 18 19#include <iptables.h> 20#include <linux/netfilter_ipv4/ip_tables.h> 21#include <linux/netfilter_ipv4/ip_set.h> 22#include <linux/netfilter_ipv4/ipt_set.h> 23#include "libipt_set.h" 24 25/* Function which prints out usage message. */ 26static void help(void) 27{ 28 printf("SET v%s options:\n" 29 " --add-set name flags\n" 30 " --del-set name flags\n" 31 " add/del src/dst IP/port from/to named sets,\n" 32 " where flags are the comma separated list of\n" 33 " 'src' and 'dst'.\n" 34 "\n", IPTABLES_VERSION); 35} 36 37static struct option opts[] = { 38 {"add-set", 1, 0, '1'}, 39 {"del-set", 1, 0, '2'}, 40 {0} 41}; 42 43/* Initialize the target. */ 44static void init(struct ipt_entry_target *target, unsigned int *nfcache) 45{ 46 struct ipt_set_info_target *info = 47 (struct ipt_set_info_target *) target->data; 48 49 memset(info, 0, sizeof(struct ipt_set_info_target)); 50 info->add_set.index = 51 info->del_set.index = IP_SET_INVALID_ID; 52 53} 54 55static void 56parse_target(char **argv, int invert, unsigned int *flags, 57 struct ipt_set_info *info, const char *what) 58{ 59 if (info->flags[0]) 60 exit_error(PARAMETER_PROBLEM, 61 "--%s can be specified only once", what); 62 63 if (check_inverse(optarg, &invert, NULL, 0)) 64 exit_error(PARAMETER_PROBLEM, 65 "Unexpected `!' after --%s", what); 66 67 if (!argv[optind] 68 || argv[optind][0] == '-' || argv[optind][0] == '!') 69 exit_error(PARAMETER_PROBLEM, 70 "--%s requires two args.", what); 71 72 if (strlen(argv[optind-1]) > IP_SET_MAXNAMELEN - 1) 73 exit_error(PARAMETER_PROBLEM, 74 "setname `%s' too long, max %d characters.", 75 argv[optind-1], IP_SET_MAXNAMELEN - 1); 76 77 get_set_byname(argv[optind - 1], info); 78 parse_bindings(argv[optind], info); 79 optind++; 80 81 *flags = 1; 82} 83 84/* Function which parses command options; returns true if it 85 ate an option */ 86static int 87parse(int c, char **argv, int invert, unsigned int *flags, 88 const struct ipt_entry *entry, struct ipt_entry_target **target) 89{ 90 struct ipt_set_info_target *myinfo = 91 (struct ipt_set_info_target *) (*target)->data; 92 93 switch (c) { 94 case '1': /* --add-set <set> <flags> */ 95 parse_target(argv, invert, flags, 96 &myinfo->add_set, "add-set"); 97 break; 98 case '2': /* --del-set <set>[:<flags>] <flags> */ 99 parse_target(argv, invert, flags, 100 &myinfo->del_set, "del-set"); 101 break; 102 103 default: 104 return 0; 105 } 106 return 1; 107} 108 109/* Final check; must specify at least one. */ 110static void final_check(unsigned int flags) 111{ 112 if (!flags) 113 exit_error(PARAMETER_PROBLEM, 114 "You must specify either `--add-set' or `--del-set'"); 115} 116 117static void 118print_target(const char *prefix, const struct ipt_set_info *info) 119{ 120 int i; 121 char setname[IP_SET_MAXNAMELEN]; 122 123 if (info->index == IP_SET_INVALID_ID) 124 return; 125 get_set_byid(setname, info->index); 126 printf("%s %s", prefix, setname); 127 for (i = 0; i < IP_SET_MAX_BINDINGS; i++) { 128 if (!info->flags[i]) 129 break; 130 printf("%s%s", 131 i == 0 ? " " : ",", 132 info->flags[i] & IPSET_SRC ? "src" : "dst"); 133 } 134 printf(" "); 135} 136 137/* Prints out the targinfo. */ 138static void 139print(const struct ipt_ip *ip, 140 const struct ipt_entry_target *target, int numeric) 141{ 142 struct ipt_set_info_target *info = 143 (struct ipt_set_info_target *) target->data; 144 145 print_target("add-set", &info->add_set); 146 print_target("del-set", &info->del_set); 147} 148 149/* Saves the union ipt_targinfo in parsable form to stdout. */ 150static void 151save(const struct ipt_ip *ip, const struct ipt_entry_target *target) 152{ 153 struct ipt_set_info_target *info = 154 (struct ipt_set_info_target *) target->data; 155 156 print_target("--add-set", &info->add_set); 157 print_target("--del-set", &info->del_set); 158} 159 160static 161struct iptables_target ipt_set_target 162= { 163 .name = "SET", 164 .version = IPTABLES_VERSION, 165 .size = IPT_ALIGN(sizeof(struct ipt_set_info_target)), 166 .userspacesize = IPT_ALIGN(sizeof(struct ipt_set_info_target)), 167 .help = &help, 168 .init = &init, 169 .parse = &parse, 170 .final_check = &final_check, 171 .print = &print, 172 .save = &save, 173 .extra_opts = opts 174}; 175 176void _init(void) 177{ 178 register_target(&ipt_set_target); 179} 180