Yasuyuki KOZAKAI | fec77fe | 2007-07-24 07:06:57 +0000 | [diff] [blame] | 1 | /* Shared library add-on to iptables to add bridge port matching support. */ |
| 2 | #include <stdio.h> |
| 3 | #include <string.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <getopt.h> |
| 6 | #include <ctype.h> |
| 7 | #include <xtables.h> |
| 8 | #include <linux/netfilter/xt_physdev.h> |
| 9 | #if defined(__GLIBC__) && __GLIBC__ == 2 |
| 10 | #include <net/ethernet.h> |
| 11 | #else |
| 12 | #include <linux/if_ether.h> |
| 13 | #endif |
| 14 | |
| 15 | static void |
| 16 | help(void) |
| 17 | { |
| 18 | printf( |
| 19 | "physdev v%s options:\n" |
| 20 | " --physdev-in [!] input name[+] bridge port name ([+] for wildcard)\n" |
| 21 | " --physdev-out [!] output name[+] bridge port name ([+] for wildcard)\n" |
| 22 | " [!] --physdev-is-in arrived on a bridge device\n" |
| 23 | " [!] --physdev-is-out will leave on a bridge device\n" |
| 24 | " [!] --physdev-is-bridged it's a bridged packet\n" |
| 25 | "\n", IPTABLES_VERSION); |
| 26 | } |
| 27 | |
Jan Engelhardt | 661f112 | 2007-07-30 14:46:51 +0000 | [diff] [blame] | 28 | static const struct option opts[] = { |
Patrick McHardy | 500f483 | 2007-09-08 15:59:04 +0000 | [diff] [blame^] | 29 | { "physdev-in", 1, NULL, '1' }, |
| 30 | { "physdev-out", 1, NULL, '2' }, |
| 31 | { "physdev-is-in", 0, NULL, '3' }, |
| 32 | { "physdev-is-out", 0, NULL, '4' }, |
| 33 | { "physdev-is-bridged", 0, NULL, '5' }, |
| 34 | { } |
Yasuyuki KOZAKAI | fec77fe | 2007-07-24 07:06:57 +0000 | [diff] [blame] | 35 | }; |
| 36 | |
| 37 | static void |
Peter Riley | ea146a9 | 2007-09-02 13:09:07 +0000 | [diff] [blame] | 38 | init(struct xt_entry_match *m) |
Yasuyuki KOZAKAI | fec77fe | 2007-07-24 07:06:57 +0000 | [diff] [blame] | 39 | { |
| 40 | } |
| 41 | |
| 42 | static int |
| 43 | parse(int c, char **argv, int invert, unsigned int *flags, |
| 44 | const void *entry, |
Yasuyuki KOZAKAI | fec77fe | 2007-07-24 07:06:57 +0000 | [diff] [blame] | 45 | struct xt_entry_match **match) |
| 46 | { |
| 47 | struct xt_physdev_info *info = |
| 48 | (struct xt_physdev_info*)(*match)->data; |
| 49 | |
| 50 | switch (c) { |
| 51 | case '1': |
| 52 | if (*flags & XT_PHYSDEV_OP_IN) |
| 53 | goto multiple_use; |
| 54 | check_inverse(optarg, &invert, &optind, 0); |
| 55 | parse_interface(argv[optind-1], info->physindev, |
| 56 | (unsigned char *)info->in_mask); |
| 57 | if (invert) |
| 58 | info->invert |= XT_PHYSDEV_OP_IN; |
| 59 | info->bitmask |= XT_PHYSDEV_OP_IN; |
| 60 | *flags |= XT_PHYSDEV_OP_IN; |
| 61 | break; |
| 62 | |
| 63 | case '2': |
| 64 | if (*flags & XT_PHYSDEV_OP_OUT) |
| 65 | goto multiple_use; |
| 66 | check_inverse(optarg, &invert, &optind, 0); |
| 67 | parse_interface(argv[optind-1], info->physoutdev, |
| 68 | (unsigned char *)info->out_mask); |
| 69 | if (invert) |
| 70 | info->invert |= XT_PHYSDEV_OP_OUT; |
| 71 | info->bitmask |= XT_PHYSDEV_OP_OUT; |
| 72 | *flags |= XT_PHYSDEV_OP_OUT; |
| 73 | break; |
| 74 | |
| 75 | case '3': |
| 76 | if (*flags & XT_PHYSDEV_OP_ISIN) |
| 77 | goto multiple_use; |
| 78 | check_inverse(optarg, &invert, &optind, 0); |
| 79 | info->bitmask |= XT_PHYSDEV_OP_ISIN; |
| 80 | if (invert) |
| 81 | info->invert |= XT_PHYSDEV_OP_ISIN; |
| 82 | *flags |= XT_PHYSDEV_OP_ISIN; |
| 83 | break; |
| 84 | |
| 85 | case '4': |
| 86 | if (*flags & XT_PHYSDEV_OP_ISOUT) |
| 87 | goto multiple_use; |
| 88 | check_inverse(optarg, &invert, &optind, 0); |
| 89 | info->bitmask |= XT_PHYSDEV_OP_ISOUT; |
| 90 | if (invert) |
| 91 | info->invert |= XT_PHYSDEV_OP_ISOUT; |
| 92 | *flags |= XT_PHYSDEV_OP_ISOUT; |
| 93 | break; |
| 94 | |
| 95 | case '5': |
| 96 | if (*flags & XT_PHYSDEV_OP_BRIDGED) |
| 97 | goto multiple_use; |
| 98 | check_inverse(optarg, &invert, &optind, 0); |
| 99 | if (invert) |
| 100 | info->invert |= XT_PHYSDEV_OP_BRIDGED; |
| 101 | *flags |= XT_PHYSDEV_OP_BRIDGED; |
| 102 | info->bitmask |= XT_PHYSDEV_OP_BRIDGED; |
| 103 | break; |
| 104 | |
| 105 | default: |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | return 1; |
| 110 | multiple_use: |
| 111 | exit_error(PARAMETER_PROBLEM, |
| 112 | "multiple use of the same physdev option is not allowed"); |
| 113 | |
| 114 | } |
| 115 | |
| 116 | static void final_check(unsigned int flags) |
| 117 | { |
| 118 | if (flags == 0) |
| 119 | exit_error(PARAMETER_PROBLEM, "PHYSDEV: no physdev option specified"); |
| 120 | } |
| 121 | |
| 122 | static void |
| 123 | print(const void *ip, |
| 124 | const struct xt_entry_match *match, |
| 125 | int numeric) |
| 126 | { |
| 127 | struct xt_physdev_info *info = |
| 128 | (struct xt_physdev_info*)match->data; |
| 129 | |
| 130 | printf("PHYSDEV match"); |
| 131 | if (info->bitmask & XT_PHYSDEV_OP_ISIN) |
| 132 | printf("%s --physdev-is-in", |
| 133 | info->invert & XT_PHYSDEV_OP_ISIN ? " !":""); |
| 134 | if (info->bitmask & XT_PHYSDEV_OP_IN) |
| 135 | printf("%s --physdev-in %s", |
| 136 | (info->invert & XT_PHYSDEV_OP_IN) ? " !":"", info->physindev); |
| 137 | |
| 138 | if (info->bitmask & XT_PHYSDEV_OP_ISOUT) |
| 139 | printf("%s --physdev-is-out", |
| 140 | info->invert & XT_PHYSDEV_OP_ISOUT ? " !":""); |
| 141 | if (info->bitmask & XT_PHYSDEV_OP_OUT) |
| 142 | printf("%s --physdev-out %s", |
| 143 | (info->invert & XT_PHYSDEV_OP_OUT) ? " !":"", info->physoutdev); |
| 144 | if (info->bitmask & XT_PHYSDEV_OP_BRIDGED) |
| 145 | printf("%s --physdev-is-bridged", |
| 146 | info->invert & XT_PHYSDEV_OP_BRIDGED ? " !":""); |
| 147 | printf(" "); |
| 148 | } |
| 149 | |
| 150 | static void save(const void *ip, const struct xt_entry_match *match) |
| 151 | { |
| 152 | struct xt_physdev_info *info = |
| 153 | (struct xt_physdev_info*)match->data; |
| 154 | |
| 155 | if (info->bitmask & XT_PHYSDEV_OP_ISIN) |
| 156 | printf("%s --physdev-is-in", |
| 157 | info->invert & XT_PHYSDEV_OP_ISIN ? " !":""); |
| 158 | if (info->bitmask & XT_PHYSDEV_OP_IN) |
| 159 | printf("%s --physdev-in %s", |
| 160 | (info->invert & XT_PHYSDEV_OP_IN) ? " !":"", info->physindev); |
| 161 | |
| 162 | if (info->bitmask & XT_PHYSDEV_OP_ISOUT) |
| 163 | printf("%s --physdev-is-out", |
| 164 | info->invert & XT_PHYSDEV_OP_ISOUT ? " !":""); |
| 165 | if (info->bitmask & XT_PHYSDEV_OP_OUT) |
| 166 | printf("%s --physdev-out %s", |
| 167 | (info->invert & XT_PHYSDEV_OP_OUT) ? " !":"", info->physoutdev); |
| 168 | if (info->bitmask & XT_PHYSDEV_OP_BRIDGED) |
| 169 | printf("%s --physdev-is-bridged", |
| 170 | info->invert & XT_PHYSDEV_OP_BRIDGED ? " !":""); |
| 171 | printf(" "); |
| 172 | } |
| 173 | |
| 174 | static struct xtables_match physdev = { |
Yasuyuki KOZAKAI | fec77fe | 2007-07-24 07:06:57 +0000 | [diff] [blame] | 175 | .family = AF_INET, |
| 176 | .name = "physdev", |
| 177 | .version = IPTABLES_VERSION, |
| 178 | .size = XT_ALIGN(sizeof(struct xt_physdev_info)), |
| 179 | .userspacesize = XT_ALIGN(sizeof(struct xt_physdev_info)), |
| 180 | .help = &help, |
| 181 | .init = &init, |
| 182 | .parse = &parse, |
| 183 | .final_check = &final_check, |
| 184 | .print = &print, |
| 185 | .save = &save, |
| 186 | .extra_opts = opts |
| 187 | }; |
| 188 | |
| 189 | static struct xtables_match physdev6 = { |
Yasuyuki KOZAKAI | fec77fe | 2007-07-24 07:06:57 +0000 | [diff] [blame] | 190 | .family = AF_INET6, |
| 191 | .name = "physdev", |
| 192 | .version = IPTABLES_VERSION, |
| 193 | .size = XT_ALIGN(sizeof(struct xt_physdev_info)), |
| 194 | .userspacesize = XT_ALIGN(sizeof(struct xt_physdev_info)), |
| 195 | .help = &help, |
| 196 | .init = &init, |
| 197 | .parse = &parse, |
| 198 | .final_check = &final_check, |
| 199 | .print = &print, |
| 200 | .save = &save, |
| 201 | .extra_opts = opts |
| 202 | }; |
| 203 | |
| 204 | void _init(void) |
| 205 | { |
| 206 | xtables_register_match(&physdev); |
| 207 | xtables_register_match(&physdev6); |
| 208 | } |