Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 1 | /* Shared library add-on to iptables to add ESP support. */ |
| 2 | #include <stdio.h> |
| 3 | #include <netdb.h> |
| 4 | #include <string.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <getopt.h> |
| 7 | #include <errno.h> |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 8 | #include <xtables.h> |
| 9 | #include <linux/netfilter/xt_esp.h> |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 10 | |
| 11 | /* Function which prints out usage message. */ |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 12 | static void esp_help(void) |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 13 | { |
| 14 | printf( |
| 15 | "ESP v%s options:\n" |
| 16 | " --espspi [!] spi[:spi]\n" |
| 17 | " match spi (range)\n", |
Harald Welte | 80fe35d | 2002-05-29 13:08:15 +0000 | [diff] [blame] | 18 | IPTABLES_VERSION); |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 19 | } |
| 20 | |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 21 | static const struct option esp_opts[] = { |
Patrick McHardy | 500f483 | 2007-09-08 15:59:04 +0000 | [diff] [blame] | 22 | { "espspi", 1, NULL, '1' }, |
| 23 | { } |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 24 | }; |
| 25 | |
| 26 | static u_int32_t |
| 27 | parse_esp_spi(const char *spistr) |
| 28 | { |
| 29 | unsigned long int spi; |
| 30 | char* ep; |
| 31 | |
| 32 | spi = strtoul(spistr,&ep,0) ; |
| 33 | |
| 34 | if ( spistr == ep ) { |
| 35 | exit_error(PARAMETER_PROBLEM, |
| 36 | "ESP no valid digits in spi `%s'", spistr); |
| 37 | } |
| 38 | if ( spi == ULONG_MAX && errno == ERANGE ) { |
| 39 | exit_error(PARAMETER_PROBLEM, |
| 40 | "spi `%s' specified too big: would overflow", spistr); |
| 41 | } |
| 42 | if ( *spistr != '\0' && *ep != '\0' ) { |
| 43 | exit_error(PARAMETER_PROBLEM, |
| 44 | "ESP error parsing spi `%s'", spistr); |
| 45 | } |
| 46 | return (u_int32_t) spi; |
| 47 | } |
| 48 | |
| 49 | static void |
| 50 | parse_esp_spis(const char *spistring, u_int32_t *spis) |
| 51 | { |
| 52 | char *buffer; |
| 53 | char *cp; |
| 54 | |
| 55 | buffer = strdup(spistring); |
| 56 | if ((cp = strchr(buffer, ':')) == NULL) |
| 57 | spis[0] = spis[1] = parse_esp_spi(buffer); |
| 58 | else { |
| 59 | *cp = '\0'; |
| 60 | cp++; |
| 61 | |
| 62 | spis[0] = buffer[0] ? parse_esp_spi(buffer) : 0; |
| 63 | spis[1] = cp[0] ? parse_esp_spi(cp) : 0xFFFFFFFF; |
Yasuyuki KOZAKAI | 2c627cf | 2006-04-15 03:11:15 +0000 | [diff] [blame] | 64 | if (spis[0] > spis[1]) |
| 65 | exit_error(PARAMETER_PROBLEM, |
| 66 | "Invalid ESP spi range: %s", spistring); |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 67 | } |
| 68 | free(buffer); |
| 69 | } |
| 70 | |
| 71 | /* Initialize the match. */ |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 72 | static void esp_init(struct xt_entry_match *m) |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 73 | { |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 74 | struct xt_esp *espinfo = (struct xt_esp *)m->data; |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 75 | |
| 76 | espinfo->spis[1] = 0xFFFFFFFF; |
| 77 | } |
| 78 | |
| 79 | #define ESP_SPI 0x01 |
| 80 | |
| 81 | /* Function which parses command options; returns true if it |
| 82 | ate an option */ |
| 83 | static int |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 84 | esp_parse(int c, char **argv, int invert, unsigned int *flags, |
| 85 | const void *entry, struct xt_entry_match **match) |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 86 | { |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 87 | struct xt_esp *espinfo = (struct xt_esp *)(*match)->data; |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 88 | |
| 89 | switch (c) { |
| 90 | case '1': |
| 91 | if (*flags & ESP_SPI) |
| 92 | exit_error(PARAMETER_PROBLEM, |
Harald Welte | f0ac814 | 2002-03-26 12:50:28 +0000 | [diff] [blame] | 93 | "Only one `--espspi' allowed"); |
Harald Welte | b77f1da | 2002-03-14 11:35:58 +0000 | [diff] [blame] | 94 | check_inverse(optarg, &invert, &optind, 0); |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 95 | parse_esp_spis(argv[optind-1], espinfo->spis); |
| 96 | if (invert) |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 97 | espinfo->invflags |= XT_ESP_INV_SPI; |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 98 | *flags |= ESP_SPI; |
| 99 | break; |
| 100 | default: |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | return 1; |
| 105 | } |
| 106 | |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 107 | static void |
| 108 | print_spis(const char *name, u_int32_t min, u_int32_t max, |
| 109 | int invert) |
| 110 | { |
| 111 | const char *inv = invert ? "!" : ""; |
| 112 | |
| 113 | if (min != 0 || max != 0xFFFFFFFF || invert) { |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 114 | if (min == max) |
| 115 | printf("%s:%s%u ", name, inv, min); |
| 116 | else |
| 117 | printf("%ss:%s%u:%u ", name, inv, min, max); |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 118 | } |
| 119 | } |
| 120 | |
| 121 | /* Prints out the union ipt_matchinfo. */ |
| 122 | static void |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 123 | esp_print(const void *ip, const struct xt_entry_match *match, int numeric) |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 124 | { |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 125 | const struct xt_esp *esp = (struct xt_esp *)match->data; |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 126 | |
| 127 | printf("esp "); |
| 128 | print_spis("spi", esp->spis[0], esp->spis[1], |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 129 | esp->invflags & XT_ESP_INV_SPI); |
| 130 | if (esp->invflags & ~XT_ESP_INV_MASK) |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 131 | printf("Unknown invflags: 0x%X ", |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 132 | esp->invflags & ~XT_ESP_INV_MASK); |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | /* Saves the union ipt_matchinfo in parsable form to stdout. */ |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 136 | static void esp_save(const void *ip, const struct xt_entry_match *match) |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 137 | { |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 138 | const struct xt_esp *espinfo = (struct xt_esp *)match->data; |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 139 | |
Harald Welte | f0ac814 | 2002-03-26 12:50:28 +0000 | [diff] [blame] | 140 | if (!(espinfo->spis[0] == 0 |
| 141 | && espinfo->spis[1] == 0xFFFFFFFF)) { |
| 142 | printf("--espspi %s", |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 143 | (espinfo->invflags & XT_ESP_INV_SPI) ? "! " : ""); |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 144 | if (espinfo->spis[0] |
| 145 | != espinfo->spis[1]) |
Harald Welte | f0ac814 | 2002-03-26 12:50:28 +0000 | [diff] [blame] | 146 | printf("%u:%u ", |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 147 | espinfo->spis[0], |
| 148 | espinfo->spis[1]); |
| 149 | else |
Harald Welte | f0ac814 | 2002-03-26 12:50:28 +0000 | [diff] [blame] | 150 | printf("%u ", |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 151 | espinfo->spis[0]); |
| 152 | } |
| 153 | |
| 154 | } |
| 155 | |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 156 | static struct xtables_match esp_match = { |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 157 | .family = AF_INET, |
Pablo Neira | 8caee8b | 2004-12-28 13:11:59 +0000 | [diff] [blame] | 158 | .name = "esp", |
| 159 | .version = IPTABLES_VERSION, |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 160 | .size = XT_ALIGN(sizeof(struct xt_esp)), |
| 161 | .userspacesize = XT_ALIGN(sizeof(struct xt_esp)), |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 162 | .help = esp_help, |
| 163 | .init = esp_init, |
| 164 | .parse = esp_parse, |
| 165 | .print = esp_print, |
| 166 | .save = esp_save, |
| 167 | .extra_opts = esp_opts, |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 168 | }; |
| 169 | |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 170 | static struct xtables_match esp_match6 = { |
Yasuyuki KOZAKAI | 0a04e8d | 2007-07-24 07:16:20 +0000 | [diff] [blame] | 171 | .family = AF_INET6, |
| 172 | .name = "esp", |
| 173 | .version = IPTABLES_VERSION, |
| 174 | .size = XT_ALIGN(sizeof(struct xt_esp)), |
| 175 | .userspacesize = XT_ALIGN(sizeof(struct xt_esp)), |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 176 | .help = esp_help, |
| 177 | .init = esp_init, |
| 178 | .parse = esp_parse, |
| 179 | .print = esp_print, |
| 180 | .save = esp_save, |
| 181 | .extra_opts = esp_opts, |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 182 | }; |
| 183 | |
| 184 | void |
| 185 | _init(void) |
| 186 | { |
Jan Engelhardt | 181dead | 2007-10-04 16:27:07 +0000 | [diff] [blame] | 187 | xtables_register_match(&esp_match); |
| 188 | xtables_register_match(&esp_match6); |
Rusty Russell | 5245182 | 2000-08-27 07:47:46 +0000 | [diff] [blame] | 189 | } |