Harald Welte | 469d18f | 2006-01-26 14:43:52 +0000 | [diff] [blame] | 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 <ip6tables.h> |
| 29 | #include "../include/linux/netfilter_ipv4/ipt_connmark.h" |
| 30 | |
| 31 | /* Function which prints out usage message. */ |
| 32 | static void |
| 33 | help(void) |
| 34 | { |
| 35 | printf( |
| 36 | "CONNMARK match v%s options:\n" |
| 37 | "[!] --mark value[/mask] Match nfmark value with optional mask\n" |
| 38 | "\n", |
| 39 | IPTABLES_VERSION); |
| 40 | } |
| 41 | |
| 42 | static struct option opts[] = { |
| 43 | { "mark", 1, 0, '1' }, |
| 44 | {0} |
| 45 | }; |
| 46 | |
| 47 | /* Initialize the match. */ |
| 48 | static void |
| 49 | init(struct ip6t_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 */ |
| 57 | static int |
| 58 | parse(int c, char **argv, int invert, unsigned int *flags, |
| 59 | const struct ip6t_entry *entry, |
| 60 | unsigned int *nfcache, |
| 61 | struct ip6t_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 | |
| 89 | static void |
| 90 | print_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. */ |
| 99 | static void |
| 100 | final_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. */ |
| 108 | static void |
| 109 | print(const struct ip6t_ip6 *ip, |
| 110 | const struct ip6t_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. */ |
| 122 | static void |
| 123 | save(const struct ip6t_ip6 *ip, const struct ip6t_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 | |
| 134 | static struct ip6tables_match connmark_match = { |
| 135 | .name = "connmark", |
| 136 | .version = IPTABLES_VERSION, |
| 137 | .size = IP6T_ALIGN(sizeof(struct ipt_connmark_info)), |
| 138 | .userspacesize = IP6T_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 | |
| 148 | void _init(void) |
| 149 | { |
| 150 | register_match6(&connmark_match); |
| 151 | } |