1/* Shared library add-on to iptables to add connmark matching support. 2 * 3 * (C) 2002,2004 MARA Systems AB <http://www.marasystems.com> 4 * by Henrik Nordstrom <hno@marasystems.com> 5 * 6 * Version 1.1 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22#include <stdio.h> 23#include <netdb.h> 24#include <string.h> 25#include <stdlib.h> 26#include <getopt.h> 27 28#include <iptables.h> 29#include "../include/linux/netfilter_ipv4/ipt_connmark.h" 30 31/* Function which prints out usage message. */ 32static void 33help(void) 34{ 35 printf( 36"CONNMARK match v%s options:\n" 37"[!] --mark value[/mask] Match nfmark value with optional mask\n" 38"\n", 39IPTABLES_VERSION); 40} 41 42static struct option opts[] = { 43 { "mark", 1, 0, '1' }, 44 {0} 45}; 46 47/* Initialize the match. */ 48static void 49init(struct ipt_entry_match *m, unsigned int *nfcache) 50{ 51 /* Can't cache this. */ 52 *nfcache |= NFC_UNKNOWN; 53} 54 55/* Function which parses command options; returns true if it 56 ate an option */ 57static int 58parse(int c, char **argv, int invert, unsigned int *flags, 59 const struct ipt_entry *entry, 60 unsigned int *nfcache, 61 struct ipt_entry_match **match) 62{ 63 struct ipt_connmark_info *markinfo = (struct ipt_connmark_info *)(*match)->data; 64 65 switch (c) { 66 char *end; 67 case '1': 68 check_inverse(optarg, &invert, &optind, 0); 69 70 markinfo->mark = strtoul(optarg, &end, 0); 71 markinfo->mask = 0xffffffffUL; 72 73 if (*end == '/') 74 markinfo->mask = strtoul(end+1, &end, 0); 75 76 if (*end != '\0' || end == optarg) 77 exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg); 78 if (invert) 79 markinfo->invert = 1; 80 *flags = 1; 81 break; 82 83 default: 84 return 0; 85 } 86 return 1; 87} 88 89static void 90print_mark(unsigned long mark, unsigned long mask, int numeric) 91{ 92 if(mask != 0xffffffffUL) 93 printf("0x%lx/0x%lx ", mark, mask); 94 else 95 printf("0x%lx ", mark); 96} 97 98/* Final check; must have specified --mark. */ 99static void 100final_check(unsigned int flags) 101{ 102 if (!flags) 103 exit_error(PARAMETER_PROBLEM, 104 "MARK match: You must specify `--mark'"); 105} 106 107/* Prints out the matchinfo. */ 108static void 109print(const struct ipt_ip *ip, 110 const struct ipt_entry_match *match, 111 int numeric) 112{ 113 struct ipt_connmark_info *info = (struct ipt_connmark_info *)match->data; 114 115 printf("CONNMARK match "); 116 if (info->invert) 117 printf("!"); 118 print_mark(info->mark, info->mask, numeric); 119} 120 121/* Saves the matchinfo in parsable form to stdout. */ 122static void 123save(const struct ipt_ip *ip, const struct ipt_entry_match *match) 124{ 125 struct ipt_connmark_info *info = (struct ipt_connmark_info *)match->data; 126 127 if (info->invert) 128 printf("! "); 129 130 printf("--mark "); 131 print_mark(info->mark, info->mask, 0); 132} 133 134static struct iptables_match connmark_match = { 135 .name = "connmark", 136 .version = IPTABLES_VERSION, 137 .size = IPT_ALIGN(sizeof(struct ipt_connmark_info)), 138 .userspacesize = IPT_ALIGN(sizeof(struct ipt_connmark_info)), 139 .help = &help, 140 .init = &init, 141 .parse = &parse, 142 .final_check = &final_check, 143 .print = &print, 144 .save = &save, 145 .extra_opts = opts 146}; 147 148void _init(void) 149{ 150 register_match(&connmark_match); 151} 152