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Commit | Line | Data |
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1ffd7fd2 | 1 | /* |
ae665a52 | 2 | * m_ipt.c iptables based targets |
3d0b7439 | 3 | * utilities mostly ripped from iptables <duh, its the linux way> |
1ffd7fd2 | 4 | * |
5 | * This program is free software; you can distribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; either version | |
8 | * 2 of the License, or (at your option) any later version. | |
9 | * | |
ae665a52 | 10 | * Authors: J Hadi Salim (hadi@cyberus.ca) |
de539ecf | 11 | */ |
1ffd7fd2 | 12 | |
13 | #include <syslog.h> | |
14 | #include <sys/socket.h> | |
15 | #include <netinet/in.h> | |
16 | #include <arpa/inet.h> | |
17 | #include <iptables.h> | |
ece02ea0 | 18 | #include <linux/netfilter.h> |
1ffd7fd2 | 19 | #include <linux/netfilter_ipv4/ip_tables.h> |
20 | #include "utils.h" | |
21 | #include "tc_util.h" | |
22 | #include <linux/tc_act/tc_ipt.h> | |
23 | #include <stdio.h> | |
24 | #include <dlfcn.h> | |
25 | #include <getopt.h> | |
26 | #include <errno.h> | |
27 | #include <string.h> | |
28 | #include <netdb.h> | |
29 | #include <stdlib.h> | |
30 | #include <ctype.h> | |
31 | #include <stdarg.h> | |
1ffd7fd2 | 32 | #include <unistd.h> |
33 | #include <fcntl.h> | |
34 | #include <sys/wait.h> | |
35 | ||
95dd5950 MF |
36 | static const char *pname = "tc-ipt"; |
37 | static const char *tname = "mangle"; | |
38 | static const char *pversion = "0.1"; | |
1ffd7fd2 | 39 | |
40 | static const char *ipthooks[] = { | |
41 | "NF_IP_PRE_ROUTING", | |
42 | "NF_IP_LOCAL_IN", | |
43 | "NF_IP_FORWARD", | |
44 | "NF_IP_LOCAL_OUT", | |
45 | "NF_IP_POST_ROUTING", | |
46 | }; | |
47 | ||
48 | static struct option original_opts[] = { | |
49 | {"jump", 1, 0, 'j'}, | |
50 | {0, 0, 0, 0} | |
51 | }; | |
52 | ||
9b32f896 | 53 | static struct xtables_target *t_list; |
6d4662d4 | 54 | static struct option *opts = original_opts; |
32a121cb | 55 | static unsigned int global_option_offset; |
1ffd7fd2 | 56 | #define OPTION_OFFSET 256 |
57 | ||
de539ecf | 58 | char *lib_dir; |
1ffd7fd2 | 59 | |
60 | void | |
9b32f896 | 61 | xtables_register_target(struct xtables_target *me) |
1ffd7fd2 | 62 | { |
1ffd7fd2 | 63 | me->next = t_list; |
64 | t_list = me; | |
65 | ||
66 | } | |
1ffd7fd2 | 67 | |
9b32f896 | 68 | static void exit_tryhelp(int status) |
1ffd7fd2 | 69 | { |
70 | fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n", | |
71 | pname, pname); | |
72 | exit(status); | |
73 | } | |
74 | ||
9b32f896 | 75 | static void exit_error(enum xtables_exittype status, char *msg, ...) |
1ffd7fd2 | 76 | { |
77 | va_list args; | |
78 | ||
79 | va_start(args, msg); | |
80 | fprintf(stderr, "%s v%s: ", pname, pversion); | |
81 | vfprintf(stderr, msg, args); | |
82 | va_end(args); | |
83 | fprintf(stderr, "\n"); | |
84 | if (status == PARAMETER_PROBLEM) | |
85 | exit_tryhelp(status); | |
86 | if (status == VERSION_PROBLEM) | |
87 | fprintf(stderr, | |
88 | "Perhaps iptables or your kernel needs to be upgraded.\n"); | |
89 | exit(status); | |
90 | } | |
91 | ||
92 | /* stolen from iptables 1.2.11 | |
93 | They should really have them as a library so i can link to them | |
94 | Email them next time i remember | |
95 | */ | |
96 | ||
a589dcda | 97 | static void free_opts(struct option *local_opts) |
1ffd7fd2 | 98 | { |
a589dcda DF |
99 | if (local_opts != original_opts) { |
100 | free(local_opts); | |
6d4662d4 SH |
101 | opts = original_opts; |
102 | global_option_offset = 0; | |
103 | } | |
1ffd7fd2 | 104 | } |
105 | ||
106 | static struct option * | |
107 | merge_options(struct option *oldopts, const struct option *newopts, | |
108 | unsigned int *option_offset) | |
109 | { | |
110 | struct option *merge; | |
111 | unsigned int num_old, num_new, i; | |
112 | ||
32a121cb SH |
113 | for (num_old = 0; oldopts[num_old].name; num_old++); |
114 | for (num_new = 0; newopts[num_new].name; num_new++); | |
1ffd7fd2 | 115 | |
116 | *option_offset = global_option_offset + OPTION_OFFSET; | |
117 | ||
32a121cb SH |
118 | merge = malloc(sizeof(struct option) * (num_new + num_old + 1)); |
119 | memcpy(merge, oldopts, num_old * sizeof(struct option)); | |
1ffd7fd2 | 120 | for (i = 0; i < num_new; i++) { |
121 | merge[num_old + i] = newopts[i]; | |
122 | merge[num_old + i].val += *option_offset; | |
123 | } | |
32a121cb | 124 | memset(merge + num_old + num_new, 0, sizeof(struct option)); |
1ffd7fd2 | 125 | |
126 | return merge; | |
127 | } | |
128 | ||
129 | static void * | |
130 | fw_calloc(size_t count, size_t size) | |
131 | { | |
132 | void *p; | |
133 | ||
134 | if ((p = (void *) calloc(count, size)) == NULL) { | |
135 | perror("iptables: calloc failed"); | |
136 | exit(1); | |
137 | } | |
138 | return p; | |
139 | } | |
140 | ||
9b32f896 | 141 | static struct xtables_target * |
1ffd7fd2 | 142 | find_t(char *name) |
143 | { | |
9b32f896 | 144 | struct xtables_target *m; |
32a121cb | 145 | |
1ffd7fd2 | 146 | for (m = t_list; m; m = m->next) { |
147 | if (strcmp(m->name, name) == 0) | |
148 | return m; | |
149 | } | |
150 | ||
151 | return NULL; | |
152 | } | |
153 | ||
9b32f896 | 154 | static struct xtables_target * |
de539ecf | 155 | get_target_name(const char *name) |
1ffd7fd2 | 156 | { |
157 | void *handle; | |
158 | char *error; | |
159 | char *new_name, *lname; | |
9b32f896 | 160 | struct xtables_target *m; |
32a121cb | 161 | char path[strlen(lib_dir) + sizeof("/libipt_.so") + strlen(name)]; |
1ffd7fd2 | 162 | |
f2e27cfb MF |
163 | #ifdef NO_SHARED_LIBS |
164 | return NULL; | |
165 | #endif | |
166 | ||
f89bb021 PS |
167 | new_name = calloc(1, strlen(name) + 1); |
168 | lname = calloc(1, strlen(name) + 1); | |
169 | if (!new_name) | |
1ffd7fd2 | 170 | exit_error(PARAMETER_PROBLEM, "get_target_name"); |
f89bb021 | 171 | if (!lname) |
1ffd7fd2 | 172 | exit_error(PARAMETER_PROBLEM, "get_target_name"); |
173 | ||
174 | strcpy(new_name, name); | |
175 | strcpy(lname, name); | |
176 | ||
177 | if (isupper(lname[0])) { | |
178 | int i; | |
32a121cb | 179 | |
1ffd7fd2 | 180 | for (i = 0; i < strlen(name); i++) { |
181 | lname[i] = tolower(lname[i]); | |
182 | } | |
183 | } | |
184 | ||
185 | if (islower(new_name[0])) { | |
186 | int i; | |
32a121cb | 187 | |
1ffd7fd2 | 188 | for (i = 0; i < strlen(new_name); i++) { |
189 | new_name[i] = toupper(new_name[i]); | |
190 | } | |
191 | } | |
192 | ||
53c01788 DF |
193 | /* try libxt_xx first */ |
194 | sprintf(path, "%s/libxt_%s.so", lib_dir, new_name); | |
1ffd7fd2 | 195 | handle = dlopen(path, RTLD_LAZY); |
196 | if (!handle) { | |
53c01788 DF |
197 | /* try libipt_xx next */ |
198 | sprintf(path, "%s/libipt_%s.so", lib_dir, new_name); | |
1ffd7fd2 | 199 | handle = dlopen(path, RTLD_LAZY); |
53c01788 DF |
200 | |
201 | if (!handle) { | |
32a121cb | 202 | sprintf(path, "%s/libxt_%s.so", lib_dir, lname); |
53c01788 DF |
203 | handle = dlopen(path, RTLD_LAZY); |
204 | } | |
205 | ||
206 | if (!handle) { | |
32a121cb | 207 | sprintf(path, "%s/libipt_%s.so", lib_dir, lname); |
53c01788 DF |
208 | handle = dlopen(path, RTLD_LAZY); |
209 | } | |
210 | /* ok, lets give up .. */ | |
1ffd7fd2 | 211 | if (!handle) { |
212 | fputs(dlerror(), stderr); | |
213 | printf("\n"); | |
6e34e7dc | 214 | free(new_name); |
1a6543c5 | 215 | free(lname); |
1ffd7fd2 | 216 | return NULL; |
217 | } | |
218 | } | |
219 | ||
220 | m = dlsym(handle, new_name); | |
221 | if ((error = dlerror()) != NULL) { | |
9b32f896 | 222 | m = (struct xtables_target *) dlsym(handle, lname); |
1ffd7fd2 | 223 | if ((error = dlerror()) != NULL) { |
224 | m = find_t(new_name); | |
32a121cb | 225 | if (m == NULL) { |
1ffd7fd2 | 226 | m = find_t(lname); |
32a121cb | 227 | if (m == NULL) { |
1ffd7fd2 | 228 | fputs(error, stderr); |
229 | fprintf(stderr, "\n"); | |
230 | dlclose(handle); | |
6e34e7dc | 231 | free(new_name); |
1a6543c5 | 232 | free(lname); |
1ffd7fd2 | 233 | return NULL; |
234 | } | |
235 | } | |
236 | } | |
237 | } | |
238 | ||
6e34e7dc | 239 | free(new_name); |
1a6543c5 | 240 | free(lname); |
1ffd7fd2 | 241 | return m; |
242 | } | |
243 | ||
894b1c66 | 244 | static void set_revision(char *name, u_int8_t revision) |
245 | { | |
246 | /* Old kernel sources don't have ".revision" field, | |
247 | * but we stole a byte from name. */ | |
248 | name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0'; | |
249 | name[IPT_FUNCTION_MAXNAMELEN - 1] = revision; | |
250 | } | |
251 | ||
ae665a52 | 252 | /* |
894b1c66 | 253 | * we may need to check for version mismatch |
254 | */ | |
9b32f896 | 255 | static int build_st(struct xtables_target *target, struct ipt_entry_target *t) |
1ffd7fd2 | 256 | { |
1ffd7fd2 | 257 | if (target) { |
258 | size_t size; | |
259 | ||
260 | size = | |
9b32f896 | 261 | XT_ALIGN(sizeof(struct ipt_entry_target)) + target->size; |
1ffd7fd2 | 262 | |
32a121cb | 263 | if (t == NULL) { |
1ffd7fd2 | 264 | target->t = fw_calloc(1, size); |
1ffd7fd2 | 265 | target->t->u.target_size = size; |
894b1c66 | 266 | |
267 | if (target->init != NULL) | |
9b32f896 | 268 | target->init(target->t); |
894b1c66 | 269 | set_revision(target->t->u.user.name, target->revision); |
1ffd7fd2 | 270 | } else { |
271 | target->t = t; | |
272 | } | |
273 | strcpy(target->t->u.user.name, target->name); | |
274 | return 0; | |
275 | } | |
276 | ||
277 | return -1; | |
278 | } | |
279 | ||
32a121cb | 280 | static int parse_ipt(struct action_util *a, int *argc_p, |
1ffd7fd2 | 281 | char ***argv_p, int tca_id, struct nlmsghdr *n) |
282 | { | |
9b32f896 | 283 | struct xtables_target *m = NULL; |
1ffd7fd2 | 284 | struct ipt_entry fw; |
285 | struct rtattr *tail; | |
286 | int c; | |
287 | int rargc = *argc_p; | |
288 | char **argv = *argv_p; | |
1ffd7fd2 | 289 | int argc = 0, iargc = 0; |
290 | char k[16]; | |
1ffd7fd2 | 291 | int size = 0; |
292 | int iok = 0, ok = 0; | |
293 | __u32 hook = 0, index = 0; | |
1ffd7fd2 | 294 | |
de539ecf SH |
295 | lib_dir = getenv("IPTABLES_LIB_DIR"); |
296 | if (!lib_dir) | |
297 | lib_dir = IPT_LIB_DIR; | |
298 | ||
1ffd7fd2 | 299 | { |
300 | int i; | |
32a121cb | 301 | |
1ffd7fd2 | 302 | for (i = 0; i < rargc; i++) { |
303 | if (NULL == argv[i] || 0 == strcmp(argv[i], "action")) { | |
304 | break; | |
305 | } | |
306 | } | |
307 | iargc = argc = i; | |
308 | } | |
309 | ||
310 | if (argc <= 2) { | |
32a121cb | 311 | fprintf(stderr, "bad arguments to ipt %d vs %d\n", argc, rargc); |
1ffd7fd2 | 312 | return -1; |
313 | } | |
314 | ||
1ffd7fd2 | 315 | while (1) { |
316 | c = getopt_long(argc, argv, "j:", opts, NULL); | |
317 | if (c == -1) | |
318 | break; | |
319 | switch (c) { | |
320 | case 'j': | |
321 | m = get_target_name(optarg); | |
32a121cb | 322 | if (m != NULL) { |
1ffd7fd2 | 323 | |
32a121cb SH |
324 | if (build_st(m, NULL) < 0) { |
325 | printf(" %s error\n", m->name); | |
1ffd7fd2 | 326 | return -1; |
327 | } | |
328 | opts = | |
329 | merge_options(opts, m->extra_opts, | |
330 | &m->option_offset); | |
331 | } else { | |
32a121cb | 332 | fprintf(stderr, " failed to find target %s\n\n", optarg); |
1ffd7fd2 | 333 | return -1; |
334 | } | |
335 | ok++; | |
336 | break; | |
337 | ||
338 | default: | |
32a121cb | 339 | memset(&fw, 0, sizeof(fw)); |
1ffd7fd2 | 340 | if (m) { |
1ffd7fd2 | 341 | m->parse(c - m->option_offset, argv, 0, |
6d4662d4 | 342 | &m->tflags, NULL, &m->t); |
1ffd7fd2 | 343 | } else { |
32a121cb | 344 | fprintf(stderr, " failed to find target %s\n\n", optarg); |
1ffd7fd2 | 345 | return -1; |
346 | ||
347 | } | |
348 | ok++; | |
1ffd7fd2 | 349 | break; |
350 | ||
351 | } | |
352 | } | |
353 | ||
354 | if (iargc > optind) { | |
355 | if (matches(argv[optind], "index") == 0) { | |
356 | if (get_u32(&index, argv[optind + 1], 10)) { | |
357 | fprintf(stderr, "Illegal \"index\"\n"); | |
6d4662d4 | 358 | free_opts(opts); |
1ffd7fd2 | 359 | return -1; |
360 | } | |
361 | iok++; | |
362 | ||
363 | optind += 2; | |
364 | } | |
365 | } | |
366 | ||
367 | if (!ok && !iok) { | |
32a121cb | 368 | fprintf(stderr, " ipt Parser BAD!! (%s)\n", *argv); |
1ffd7fd2 | 369 | return -1; |
370 | } | |
371 | ||
6d4662d4 SH |
372 | /* check that we passed the correct parameters to the target */ |
373 | if (m) | |
374 | m->final_check(m->tflags); | |
375 | ||
1ffd7fd2 | 376 | { |
377 | struct tcmsg *t = NLMSG_DATA(n); | |
32a121cb | 378 | |
1ffd7fd2 | 379 | if (t->tcm_parent != TC_H_ROOT |
380 | && t->tcm_parent == TC_H_MAJ(TC_H_INGRESS)) { | |
381 | hook = NF_IP_PRE_ROUTING; | |
382 | } else { | |
383 | hook = NF_IP_POST_ROUTING; | |
384 | } | |
385 | } | |
386 | ||
fc78a8e9 | 387 | tail = NLMSG_TAIL(n); |
1ffd7fd2 | 388 | addattr_l(n, MAX_MSG, tca_id, NULL, 0); |
389 | fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]); | |
390 | fprintf(stdout, "\ttarget: "); | |
391 | ||
392 | if (m) | |
393 | m->print(NULL, m->t, 0); | |
394 | fprintf(stdout, " index %d\n", index); | |
395 | ||
396 | if (strlen(tname) > 16) { | |
397 | size = 16; | |
398 | k[15] = 0; | |
399 | } else { | |
400 | size = 1 + strlen(tname); | |
401 | } | |
402 | strncpy(k, tname, size); | |
403 | ||
404 | addattr_l(n, MAX_MSG, TCA_IPT_TABLE, k, size); | |
405 | addattr_l(n, MAX_MSG, TCA_IPT_HOOK, &hook, 4); | |
406 | addattr_l(n, MAX_MSG, TCA_IPT_INDEX, &index, 4); | |
407 | if (m) | |
408 | addattr_l(n, MAX_MSG, TCA_IPT_TARG, m->t, m->t->u.target_size); | |
fc78a8e9 | 409 | tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; |
1ffd7fd2 | 410 | |
411 | argc -= optind; | |
412 | argv += optind; | |
413 | *argc_p = rargc - iargc; | |
414 | *argv_p = argv; | |
ae665a52 | 415 | |
6e34e7dc | 416 | optind = 0; |
6d4662d4 | 417 | free_opts(opts); |
6e34e7dc | 418 | /* Clear flags if target will be used again */ |
32a121cb SH |
419 | m->tflags = 0; |
420 | m->used = 0; | |
6e34e7dc | 421 | /* Free allocated memory */ |
32a121cb SH |
422 | if (m->t) |
423 | free(m->t); | |
6e34e7dc | 424 | |
1ffd7fd2 | 425 | |
426 | return 0; | |
427 | ||
428 | } | |
429 | ||
430 | static int | |
32a121cb | 431 | print_ipt(struct action_util *au, FILE * f, struct rtattr *arg) |
1ffd7fd2 | 432 | { |
433 | struct rtattr *tb[TCA_IPT_MAX + 1]; | |
434 | struct ipt_entry_target *t = NULL; | |
1ffd7fd2 | 435 | |
436 | if (arg == NULL) | |
437 | return -1; | |
438 | ||
c6ab5b82 PM |
439 | lib_dir = getenv("IPTABLES_LIB_DIR"); |
440 | if (!lib_dir) | |
441 | lib_dir = IPT_LIB_DIR; | |
442 | ||
78934000 | 443 | parse_rtattr_nested(tb, TCA_IPT_MAX, arg); |
1ffd7fd2 | 444 | |
445 | if (tb[TCA_IPT_TABLE] == NULL) { | |
446 | fprintf(f, "[NULL ipt table name ] assuming mangle "); | |
447 | } else { | |
448 | fprintf(f, "tablename: %s ", | |
ff24746c | 449 | rta_getattr_str(tb[TCA_IPT_TABLE])); |
1ffd7fd2 | 450 | } |
451 | ||
452 | if (tb[TCA_IPT_HOOK] == NULL) { | |
453 | fprintf(f, "[NULL ipt hook name ]\n "); | |
454 | return -1; | |
455 | } else { | |
456 | __u32 hook; | |
32a121cb | 457 | |
ff24746c | 458 | hook = rta_getattr_u32(tb[TCA_IPT_HOOK]); |
32a121cb | 459 | fprintf(f, " hook: %s\n", ipthooks[hook]); |
1ffd7fd2 | 460 | } |
461 | ||
462 | if (tb[TCA_IPT_TARG] == NULL) { | |
32a121cb | 463 | fprintf(f, "\t[NULL ipt target parameters ]\n"); |
1ffd7fd2 | 464 | return -1; |
465 | } else { | |
9b32f896 | 466 | struct xtables_target *m = NULL; |
32a121cb | 467 | |
1ffd7fd2 | 468 | t = RTA_DATA(tb[TCA_IPT_TARG]); |
469 | m = get_target_name(t->u.user.name); | |
32a121cb SH |
470 | if (m != NULL) { |
471 | if (build_st(m, t) < 0) { | |
472 | fprintf(stderr, " %s error\n", m->name); | |
1ffd7fd2 | 473 | return -1; |
474 | } | |
475 | ||
476 | opts = | |
477 | merge_options(opts, m->extra_opts, | |
478 | &m->option_offset); | |
479 | } else { | |
480 | fprintf(stderr, " failed to find target %s\n\n", | |
481 | t->u.user.name); | |
482 | return -1; | |
483 | } | |
484 | fprintf(f, "\ttarget "); | |
485 | m->print(NULL, m->t, 0); | |
486 | if (tb[TCA_IPT_INDEX] == NULL) { | |
487 | fprintf(f, " [NULL ipt target index ]\n"); | |
488 | } else { | |
489 | __u32 index; | |
32a121cb | 490 | |
ff24746c | 491 | index = rta_getattr_u32(tb[TCA_IPT_INDEX]); |
32a121cb | 492 | fprintf(f, "\n\tindex %d", index); |
1ffd7fd2 | 493 | } |
494 | ||
495 | if (tb[TCA_IPT_CNT]) { | |
32a121cb SH |
496 | struct tc_cnt *c = RTA_DATA(tb[TCA_IPT_CNT]); |
497 | ||
1ffd7fd2 | 498 | fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt); |
499 | } | |
500 | if (show_stats) { | |
501 | if (tb[TCA_IPT_TM]) { | |
502 | struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]); | |
32a121cb SH |
503 | |
504 | print_tm(f, tm); | |
1ffd7fd2 | 505 | } |
ae665a52 | 506 | } |
32a121cb | 507 | fprintf(f, "\n"); |
1ffd7fd2 | 508 | |
509 | } | |
6d4662d4 | 510 | free_opts(opts); |
1ffd7fd2 | 511 | |
512 | return 0; | |
513 | } | |
514 | ||
515 | struct action_util ipt_action_util = { | |
32a121cb SH |
516 | .id = "ipt", |
517 | .parse_aopt = parse_ipt, | |
518 | .print_aopt = print_ipt, | |
1ffd7fd2 | 519 | }; |