András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 1 | /* Shared library add-on to ip6tables to add Routing header 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> |
Jan Engelhardt | 5d9678a | 2008-11-20 10:15:35 +0100 | [diff] [blame] | 8 | #include <xtables.h> |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 9 | /*#include <linux/in6.h>*/ |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 10 | #include <linux/netfilter_ipv6/ip6t_rt.h> |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 11 | #include <sys/types.h> |
| 12 | #include <sys/socket.h> |
| 13 | #include <arpa/inet.h> |
Jan Engelhardt | ddac6c5 | 2008-09-01 14:22:19 +0200 | [diff] [blame] | 14 | |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 15 | /*#define DEBUG 1*/ |
| 16 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 17 | static void rt_help(void) |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 18 | { |
| 19 | printf( |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 20 | "rt match options:\n" |
Jan Engelhardt | 9672792 | 2008-08-13 14:42:41 +0200 | [diff] [blame] | 21 | "[!] --rt-type type match the type\n" |
| 22 | "[!] --rt-segsleft num[:num] match the Segments Left field (range)\n" |
| 23 | "[!] --rt-len length total length of this header\n" |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 24 | " --rt-0-res check the reserved filed, too (type 0)\n" |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 25 | " --rt-0-addrs ADDR[,ADDR...] Type=0 addresses (list, max: %d)\n" |
| 26 | " --rt-0-not-strict List of Type=0 addresses not a strict list\n", |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 27 | IP6T_RT_HOPS); |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 28 | } |
| 29 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 30 | static const struct option rt_opts[] = { |
Patrick McHardy | 500f483 | 2007-09-08 15:59:04 +0000 | [diff] [blame] | 31 | { "rt-type", 1, NULL, '1' }, |
| 32 | { "rt-segsleft", 1, NULL, '2' }, |
| 33 | { "rt-len", 1, NULL, '3' }, |
| 34 | { "rt-0-res", 0, NULL, '4' }, |
| 35 | { "rt-0-addrs", 1, NULL, '5' }, |
| 36 | { "rt-0-not-strict", 0, NULL, '6' }, |
Max Kellermann | 9ee386a | 2008-01-29 13:48:05 +0000 | [diff] [blame] | 37 | { .name = NULL } |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 38 | }; |
| 39 | |
| 40 | static u_int32_t |
| 41 | parse_rt_num(const char *idstr, const char *typestr) |
| 42 | { |
| 43 | unsigned long int id; |
| 44 | char* ep; |
| 45 | |
| 46 | id = strtoul(idstr,&ep,0) ; |
| 47 | |
| 48 | if ( idstr == ep ) { |
| 49 | exit_error(PARAMETER_PROBLEM, |
| 50 | "RT no valid digits in %s `%s'", typestr, idstr); |
| 51 | } |
| 52 | if ( id == ULONG_MAX && errno == ERANGE ) { |
| 53 | exit_error(PARAMETER_PROBLEM, |
| 54 | "%s `%s' specified too big: would overflow", |
| 55 | typestr, idstr); |
| 56 | } |
| 57 | if ( *idstr != '\0' && *ep != '\0' ) { |
| 58 | exit_error(PARAMETER_PROBLEM, |
| 59 | "RT error parsing %s `%s'", typestr, idstr); |
| 60 | } |
Jan Engelhardt | 213e185 | 2009-01-27 17:24:34 +0100 | [diff] [blame] | 61 | return id; |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 62 | } |
| 63 | |
| 64 | static void |
| 65 | parse_rt_segsleft(const char *idstring, u_int32_t *ids) |
| 66 | { |
| 67 | char *buffer; |
| 68 | char *cp; |
| 69 | |
| 70 | buffer = strdup(idstring); |
| 71 | if ((cp = strchr(buffer, ':')) == NULL) |
| 72 | ids[0] = ids[1] = parse_rt_num(buffer,"segsleft"); |
| 73 | else { |
| 74 | *cp = '\0'; |
| 75 | cp++; |
| 76 | |
| 77 | ids[0] = buffer[0] ? parse_rt_num(buffer,"segsleft") : 0; |
| 78 | ids[1] = cp[0] ? parse_rt_num(cp,"segsleft") : 0xFFFFFFFF; |
| 79 | } |
| 80 | free(buffer); |
| 81 | } |
| 82 | |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 83 | static char * |
| 84 | addr_to_numeric(const struct in6_addr *addrp) |
| 85 | { |
| 86 | static char buf[50+1]; |
| 87 | return (char *)inet_ntop(AF_INET6, addrp, buf, sizeof(buf)); |
| 88 | } |
| 89 | |
| 90 | static struct in6_addr * |
| 91 | numeric_to_addr(const char *num) |
| 92 | { |
| 93 | static struct in6_addr ap; |
| 94 | int err; |
| 95 | |
| 96 | if ((err=inet_pton(AF_INET6, num, &ap)) == 1) |
| 97 | return ≈ |
| 98 | #ifdef DEBUG |
| 99 | fprintf(stderr, "\nnumeric2addr: %d\n", err); |
| 100 | #endif |
| 101 | exit_error(PARAMETER_PROBLEM, "bad address: %s", num); |
| 102 | |
| 103 | return (struct in6_addr *)NULL; |
| 104 | } |
| 105 | |
| 106 | |
| 107 | static int |
| 108 | parse_addresses(const char *addrstr, struct in6_addr *addrp) |
| 109 | { |
| 110 | char *buffer, *cp, *next; |
| 111 | unsigned int i; |
| 112 | |
| 113 | buffer = strdup(addrstr); |
| 114 | if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed"); |
| 115 | |
| 116 | for (cp=buffer, i=0; cp && i<IP6T_RT_HOPS; cp=next,i++) |
| 117 | { |
| 118 | next=strchr(cp, ','); |
| 119 | if (next) *next++='\0'; |
| 120 | memcpy(&(addrp[i]), numeric_to_addr(cp), sizeof(struct in6_addr)); |
| 121 | #if DEBUG |
| 122 | printf("addr str: %s\n", cp); |
| 123 | printf("addr ip6: %s\n", addr_to_numeric((numeric_to_addr(cp)))); |
| 124 | printf("addr [%d]: %s\n", i, addr_to_numeric(&(addrp[i]))); |
| 125 | #endif |
| 126 | } |
| 127 | if (cp) exit_error(PARAMETER_PROBLEM, "too many addresses specified"); |
| 128 | |
| 129 | free(buffer); |
| 130 | |
| 131 | #if DEBUG |
| 132 | printf("addr nr: %d\n", i); |
| 133 | #endif |
| 134 | |
| 135 | return i; |
| 136 | } |
| 137 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 138 | static void rt_init(struct xt_entry_match *m) |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 139 | { |
| 140 | struct ip6t_rt *rtinfo = (struct ip6t_rt *)m->data; |
| 141 | |
| 142 | rtinfo->rt_type = 0x0L; |
| 143 | rtinfo->segsleft[0] = 0x0L; |
| 144 | rtinfo->segsleft[1] = 0xFFFFFFFF; |
| 145 | rtinfo->hdrlen = 0; |
| 146 | rtinfo->flags = 0; |
| 147 | rtinfo->invflags = 0; |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 148 | rtinfo->addrnr = 0; |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 149 | } |
| 150 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 151 | static int rt_parse(int c, char **argv, int invert, unsigned int *flags, |
| 152 | const void *entry, struct xt_entry_match **match) |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 153 | { |
| 154 | struct ip6t_rt *rtinfo = (struct ip6t_rt *)(*match)->data; |
| 155 | |
| 156 | switch (c) { |
| 157 | case '1': |
| 158 | if (*flags & IP6T_RT_TYP) |
| 159 | exit_error(PARAMETER_PROBLEM, |
| 160 | "Only one `--rt-type' allowed"); |
| 161 | check_inverse(optarg, &invert, &optind, 0); |
| 162 | rtinfo->rt_type = parse_rt_num(argv[optind-1], "type"); |
| 163 | if (invert) |
| 164 | rtinfo->invflags |= IP6T_RT_INV_TYP; |
| 165 | rtinfo->flags |= IP6T_RT_TYP; |
| 166 | *flags |= IP6T_RT_TYP; |
| 167 | break; |
| 168 | case '2': |
| 169 | if (*flags & IP6T_RT_SGS) |
| 170 | exit_error(PARAMETER_PROBLEM, |
| 171 | "Only one `--rt-segsleft' allowed"); |
| 172 | check_inverse(optarg, &invert, &optind, 0); |
| 173 | parse_rt_segsleft(argv[optind-1], rtinfo->segsleft); |
| 174 | if (invert) |
| 175 | rtinfo->invflags |= IP6T_RT_INV_SGS; |
| 176 | rtinfo->flags |= IP6T_RT_SGS; |
| 177 | *flags |= IP6T_RT_SGS; |
| 178 | break; |
| 179 | case '3': |
| 180 | if (*flags & IP6T_RT_LEN) |
| 181 | exit_error(PARAMETER_PROBLEM, |
| 182 | "Only one `--rt-len' allowed"); |
| 183 | check_inverse(optarg, &invert, &optind, 0); |
| 184 | rtinfo->hdrlen = parse_rt_num(argv[optind-1], "length"); |
| 185 | if (invert) |
| 186 | rtinfo->invflags |= IP6T_RT_INV_LEN; |
| 187 | rtinfo->flags |= IP6T_RT_LEN; |
| 188 | *flags |= IP6T_RT_LEN; |
| 189 | break; |
| 190 | case '4': |
| 191 | if (*flags & IP6T_RT_RES) |
| 192 | exit_error(PARAMETER_PROBLEM, |
| 193 | "Only one `--rt-0-res' allowed"); |
| 194 | if ( !(*flags & IP6T_RT_TYP) || (rtinfo->rt_type != 0) || (rtinfo->invflags & IP6T_RT_INV_TYP) ) |
| 195 | exit_error(PARAMETER_PROBLEM, |
| 196 | "`--rt-type 0' required before `--rt-0-res'"); |
| 197 | rtinfo->flags |= IP6T_RT_RES; |
| 198 | *flags |= IP6T_RT_RES; |
| 199 | break; |
| 200 | case '5': |
| 201 | if (*flags & IP6T_RT_FST) |
| 202 | exit_error(PARAMETER_PROBLEM, |
| 203 | "Only one `--rt-0-addrs' allowed"); |
| 204 | if ( !(*flags & IP6T_RT_TYP) || (rtinfo->rt_type != 0) || (rtinfo->invflags & IP6T_RT_INV_TYP) ) |
| 205 | exit_error(PARAMETER_PROBLEM, |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 206 | "`--rt-type 0' required before `--rt-0-addrs'"); |
| 207 | check_inverse(optarg, &invert, &optind, 0); |
| 208 | if (invert) |
| 209 | exit_error(PARAMETER_PROBLEM, |
| 210 | " '!' not allowed with `--rt-0-addrs'"); |
| 211 | rtinfo->addrnr = parse_addresses(argv[optind-1], rtinfo->addrs); |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 212 | rtinfo->flags |= IP6T_RT_FST; |
| 213 | *flags |= IP6T_RT_FST; |
| 214 | break; |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 215 | case '6': |
| 216 | if (*flags & IP6T_RT_FST_NSTRICT) |
| 217 | exit_error(PARAMETER_PROBLEM, |
| 218 | "Only one `--rt-0-not-strict' allowed"); |
| 219 | if ( !(*flags & IP6T_RT_FST) ) |
| 220 | exit_error(PARAMETER_PROBLEM, |
| 221 | "`--rt-0-addr ...' required before `--rt-0-not-strict'"); |
| 222 | rtinfo->flags |= IP6T_RT_FST_NSTRICT; |
| 223 | *flags |= IP6T_RT_FST_NSTRICT; |
| 224 | break; |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 225 | default: |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | return 1; |
| 230 | } |
| 231 | |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 232 | static void |
| 233 | print_nums(const char *name, u_int32_t min, u_int32_t max, |
| 234 | int invert) |
| 235 | { |
| 236 | const char *inv = invert ? "!" : ""; |
| 237 | |
| 238 | if (min != 0 || max != 0xFFFFFFFF || invert) { |
| 239 | printf("%s", name); |
| 240 | if (min == max) { |
| 241 | printf(":%s", inv); |
| 242 | printf("%u", min); |
| 243 | } else { |
| 244 | printf("s:%s", inv); |
| 245 | printf("%u",min); |
| 246 | printf(":"); |
| 247 | printf("%u",max); |
| 248 | } |
| 249 | printf(" "); |
| 250 | } |
| 251 | } |
| 252 | |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 253 | static void |
Jan Engelhardt | 7a236f4 | 2008-03-03 12:30:41 +0100 | [diff] [blame] | 254 | print_addresses(unsigned int addrnr, struct in6_addr *addrp) |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 255 | { |
| 256 | unsigned int i; |
| 257 | |
| 258 | for(i=0; i<addrnr; i++){ |
| 259 | printf("%s%c", addr_to_numeric(&(addrp[i])), (i!=addrnr-1)?',':' '); |
| 260 | } |
| 261 | } |
| 262 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 263 | static void rt_print(const void *ip, const struct xt_entry_match *match, |
| 264 | int numeric) |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 265 | { |
| 266 | const struct ip6t_rt *rtinfo = (struct ip6t_rt *)match->data; |
| 267 | |
| 268 | printf("rt "); |
| 269 | if (rtinfo->flags & IP6T_RT_TYP) |
| 270 | printf("type:%s%d ", rtinfo->invflags & IP6T_RT_INV_TYP ? "!" : "", |
| 271 | rtinfo->rt_type); |
| 272 | print_nums("segsleft", rtinfo->segsleft[0], rtinfo->segsleft[1], |
| 273 | rtinfo->invflags & IP6T_RT_INV_SGS); |
| 274 | if (rtinfo->flags & IP6T_RT_LEN) { |
| 275 | printf("length"); |
| 276 | printf(":%s", rtinfo->invflags & IP6T_RT_INV_LEN ? "!" : ""); |
| 277 | printf("%u", rtinfo->hdrlen); |
| 278 | printf(" "); |
| 279 | } |
| 280 | if (rtinfo->flags & IP6T_RT_RES) printf("reserved "); |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 281 | if (rtinfo->flags & IP6T_RT_FST) printf("0-addrs "); |
Fabrice MARIE | ae31bb6 | 2002-06-14 07:38:16 +0000 | [diff] [blame] | 282 | print_addresses(rtinfo->addrnr, (struct in6_addr *)rtinfo->addrs); |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 283 | if (rtinfo->flags & IP6T_RT_FST_NSTRICT) printf("0-not-strict "); |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 284 | if (rtinfo->invflags & ~IP6T_RT_INV_MASK) |
| 285 | printf("Unknown invflags: 0x%X ", |
| 286 | rtinfo->invflags & ~IP6T_RT_INV_MASK); |
| 287 | } |
| 288 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 289 | static void rt_save(const void *ip, const struct xt_entry_match *match) |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 290 | { |
| 291 | const struct ip6t_rt *rtinfo = (struct ip6t_rt *)match->data; |
| 292 | |
| 293 | if (rtinfo->flags & IP6T_RT_TYP) { |
Jan Engelhardt | cea9f71 | 2008-12-09 15:06:20 +0100 | [diff] [blame] | 294 | printf("%s--rt-type %u ", |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 295 | (rtinfo->invflags & IP6T_RT_INV_TYP) ? "! " : "", |
| 296 | rtinfo->rt_type); |
| 297 | } |
| 298 | |
| 299 | if (!(rtinfo->segsleft[0] == 0 |
| 300 | && rtinfo->segsleft[1] == 0xFFFFFFFF)) { |
Jan Engelhardt | cea9f71 | 2008-12-09 15:06:20 +0100 | [diff] [blame] | 301 | printf("%s--rt-segsleft ", |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 302 | (rtinfo->invflags & IP6T_RT_INV_SGS) ? "! " : ""); |
| 303 | if (rtinfo->segsleft[0] |
| 304 | != rtinfo->segsleft[1]) |
| 305 | printf("%u:%u ", |
| 306 | rtinfo->segsleft[0], |
| 307 | rtinfo->segsleft[1]); |
| 308 | else |
| 309 | printf("%u ", |
| 310 | rtinfo->segsleft[0]); |
| 311 | } |
| 312 | |
| 313 | if (rtinfo->flags & IP6T_RT_LEN) { |
Jan Engelhardt | cea9f71 | 2008-12-09 15:06:20 +0100 | [diff] [blame] | 314 | printf("%s--rt-len %u ", |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 315 | (rtinfo->invflags & IP6T_RT_INV_LEN) ? "! " : "", |
| 316 | rtinfo->hdrlen); |
| 317 | } |
| 318 | |
| 319 | if (rtinfo->flags & IP6T_RT_RES) printf("--rt-0-res "); |
| 320 | if (rtinfo->flags & IP6T_RT_FST) printf("--rt-0-addrs "); |
Fabrice MARIE | ae31bb6 | 2002-06-14 07:38:16 +0000 | [diff] [blame] | 321 | print_addresses(rtinfo->addrnr, (struct in6_addr *)rtinfo->addrs); |
András Kis-Szabó | fce8699 | 2002-04-29 13:48:46 +0000 | [diff] [blame] | 322 | if (rtinfo->flags & IP6T_RT_FST_NSTRICT) printf("--rt-0-not-strict "); |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 323 | |
| 324 | } |
| 325 | |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 326 | static struct xtables_match rt_mt6_reg = { |
Harald Welte | 02aa733 | 2005-02-01 15:38:20 +0000 | [diff] [blame] | 327 | .name = "rt", |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 328 | .version = XTABLES_VERSION, |
Jan Engelhardt | 03d9948 | 2008-11-18 12:27:54 +0100 | [diff] [blame] | 329 | .family = NFPROTO_IPV6, |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 330 | .size = XT_ALIGN(sizeof(struct ip6t_rt)), |
| 331 | .userspacesize = XT_ALIGN(sizeof(struct ip6t_rt)), |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 332 | .help = rt_help, |
| 333 | .init = rt_init, |
| 334 | .parse = rt_parse, |
| 335 | .print = rt_print, |
| 336 | .save = rt_save, |
| 337 | .extra_opts = rt_opts, |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 338 | }; |
| 339 | |
| 340 | void |
| 341 | _init(void) |
| 342 | { |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 343 | xtables_register_match(&rt_mt6_reg); |
András Kis-Szabó | a420416 | 2002-04-24 09:35:01 +0000 | [diff] [blame] | 344 | } |