1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2019 Yandex LLC
5 * Copyright (c) 2019 Andrey V. Elsukov <[email protected]>
6 * Copyright (c) 2019 Boris N. Lytochkin <[email protected]>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/types.h>
34 #include <sys/socket.h>
35
36 #include "ipfw2.h"
37
38 #include <ctype.h>
39 #include <err.h>
40 #include <errno.h>
41 #include <inttypes.h>
42 #include <netdb.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <sysexits.h>
47
48 #include <net/if.h>
49 #include <netinet/in.h>
50 #include <netinet/ip_fw.h>
51 #include <netinet6/ip_fw_nat64.h>
52 #include <arpa/inet.h>
53
54 typedef int (nat64clat_cb_t)(ipfw_nat64clat_cfg *i, const char *name,
55 uint8_t set);
56 static int nat64clat_foreach(nat64clat_cb_t *f, const char *name, uint8_t set,
57 int sort);
58
59 static void nat64clat_create(const char *name, uint8_t set, int ac, char **av);
60 static void nat64clat_config(const char *name, uint8_t set, int ac, char **av);
61 static void nat64clat_destroy(const char *name, uint8_t set);
62 static void nat64clat_stats(const char *name, uint8_t set);
63 static void nat64clat_reset_stats(const char *name, uint8_t set);
64 static int nat64clat_show_cb(ipfw_nat64clat_cfg *cfg, const char *name,
65 uint8_t set);
66 static int nat64clat_destroy_cb(ipfw_nat64clat_cfg *cfg, const char *name,
67 uint8_t set);
68
69 static struct _s_x nat64cmds[] = {
70 { "create", TOK_CREATE },
71 { "config", TOK_CONFIG },
72 { "destroy", TOK_DESTROY },
73 { "list", TOK_LIST },
74 { "show", TOK_LIST },
75 { "stats", TOK_STATS },
76 { NULL, 0 }
77 };
78
79 static struct _s_x nat64statscmds[] = {
80 { "reset", TOK_RESET },
81 { NULL, 0 }
82 };
83
84 /*
85 * This one handles all nat64clat-related commands
86 * ipfw [set N] nat64clat NAME {create | config} ...
87 * ipfw [set N] nat64clat NAME stats [reset]
88 * ipfw [set N] nat64clat {NAME | all} destroy
89 * ipfw [set N] nat64clat {NAME | all} {list | show}
90 */
91 #define nat64clat_check_name table_check_name
92 void
ipfw_nat64clat_handler(int ac,char * av[])93 ipfw_nat64clat_handler(int ac, char *av[])
94 {
95 const char *name;
96 int tcmd;
97 uint8_t set;
98
99 if (g_co.use_set != 0)
100 set = g_co.use_set - 1;
101 else
102 set = 0;
103 ac--; av++;
104
105 NEED1("nat64clat needs instance name");
106 name = *av;
107 if (nat64clat_check_name(name) != 0) {
108 if (strcmp(name, "all") == 0)
109 name = NULL;
110 else
111 errx(EX_USAGE, "nat64clat instance name %s is invalid",
112 name);
113 }
114 ac--; av++;
115 NEED1("nat64clat needs command");
116
117 tcmd = get_token(nat64cmds, *av, "nat64clat command");
118 if (name == NULL && tcmd != TOK_DESTROY && tcmd != TOK_LIST)
119 errx(EX_USAGE, "nat64clat instance name required");
120 switch (tcmd) {
121 case TOK_CREATE:
122 ac--; av++;
123 nat64clat_create(name, set, ac, av);
124 break;
125 case TOK_CONFIG:
126 ac--; av++;
127 nat64clat_config(name, set, ac, av);
128 break;
129 case TOK_LIST:
130 nat64clat_foreach(nat64clat_show_cb, name, set, 1);
131 break;
132 case TOK_DESTROY:
133 if (name == NULL)
134 nat64clat_foreach(nat64clat_destroy_cb, NULL, set, 0);
135 else
136 nat64clat_destroy(name, set);
137 break;
138 case TOK_STATS:
139 ac--; av++;
140 if (ac == 0) {
141 nat64clat_stats(name, set);
142 break;
143 }
144 tcmd = get_token(nat64statscmds, *av, "stats command");
145 if (tcmd == TOK_RESET)
146 nat64clat_reset_stats(name, set);
147 }
148 }
149
150
151 static void
nat64clat_fill_ntlv(ipfw_obj_ntlv * ntlv,const char * name,uint8_t set)152 nat64clat_fill_ntlv(ipfw_obj_ntlv *ntlv, const char *name, uint8_t set)
153 {
154
155 ntlv->head.type = IPFW_TLV_EACTION_NAME(1); /* it doesn't matter */
156 ntlv->head.length = sizeof(ipfw_obj_ntlv);
157 ntlv->idx = 1;
158 ntlv->set = set;
159 strlcpy(ntlv->name, name, sizeof(ntlv->name));
160 }
161
162 static struct _s_x nat64newcmds[] = {
163 { "plat_prefix", TOK_PLAT_PREFIX },
164 { "clat_prefix", TOK_CLAT_PREFIX },
165 { "log", TOK_LOG },
166 { "-log", TOK_LOGOFF },
167 { "allow_private", TOK_PRIVATE },
168 { "-allow_private", TOK_PRIVATEOFF },
169 { NULL, 0 }
170 };
171
172 /*
173 * Creates new nat64clat instance
174 * ipfw nat64clat <NAME> create clat_prefix <prefix> plat_prefix <prefix>
175 * Request: [ ipfw_obj_lheader ipfw_nat64clat_cfg ]
176 */
177 #define NAT64CLAT_HAS_CLAT_PREFIX 0x01
178 #define NAT64CLAT_HAS_PLAT_PREFIX 0x02
179 static void
nat64clat_create(const char * name,uint8_t set,int ac,char * av[])180 nat64clat_create(const char *name, uint8_t set, int ac, char *av[])
181 {
182 char buf[sizeof(ipfw_obj_lheader) + sizeof(ipfw_nat64clat_cfg)];
183 ipfw_nat64clat_cfg *cfg;
184 ipfw_obj_lheader *olh;
185 int tcmd, flags;
186 char *p;
187 struct in6_addr prefix;
188 uint8_t plen;
189
190 memset(buf, 0, sizeof(buf));
191 olh = (ipfw_obj_lheader *)buf;
192 cfg = (ipfw_nat64clat_cfg *)(olh + 1);
193
194 /* Some reasonable defaults */
195 inet_pton(AF_INET6, "64:ff9b::", &cfg->plat_prefix);
196 cfg->plat_plen = 96;
197 cfg->set = set;
198 flags = NAT64CLAT_HAS_PLAT_PREFIX;
199 while (ac > 0) {
200 tcmd = get_token(nat64newcmds, *av, "option");
201 ac--; av++;
202
203 switch (tcmd) {
204 case TOK_PLAT_PREFIX:
205 case TOK_CLAT_PREFIX:
206 if (tcmd == TOK_PLAT_PREFIX) {
207 NEED1("IPv6 plat_prefix required");
208 } else {
209 NEED1("IPv6 clat_prefix required");
210 }
211
212 if ((p = strchr(*av, '/')) != NULL)
213 *p++ = '\0';
214 if (inet_pton(AF_INET6, *av, &prefix) != 1)
215 errx(EX_USAGE,
216 "Bad prefix: %s", *av);
217 plen = strtol(p, NULL, 10);
218 if (ipfw_check_nat64prefix(&prefix, plen) != 0)
219 errx(EX_USAGE,
220 "Bad prefix length: %s", p);
221 if (tcmd == TOK_PLAT_PREFIX) {
222 flags |= NAT64CLAT_HAS_PLAT_PREFIX;
223 cfg->plat_prefix = prefix;
224 cfg->plat_plen = plen;
225 } else {
226 flags |= NAT64CLAT_HAS_CLAT_PREFIX;
227 cfg->clat_prefix = prefix;
228 cfg->clat_plen = plen;
229 }
230 ac--; av++;
231 break;
232 case TOK_LOG:
233 cfg->flags |= NAT64_LOG;
234 break;
235 case TOK_LOGOFF:
236 cfg->flags &= ~NAT64_LOG;
237 break;
238 case TOK_PRIVATE:
239 cfg->flags |= NAT64_ALLOW_PRIVATE;
240 break;
241 case TOK_PRIVATEOFF:
242 cfg->flags &= ~NAT64_ALLOW_PRIVATE;
243 break;
244 }
245 }
246
247 /* Check validness */
248 if ((flags & NAT64CLAT_HAS_PLAT_PREFIX) != NAT64CLAT_HAS_PLAT_PREFIX)
249 errx(EX_USAGE, "plat_prefix required");
250 if ((flags & NAT64CLAT_HAS_CLAT_PREFIX) != NAT64CLAT_HAS_CLAT_PREFIX)
251 errx(EX_USAGE, "clat_prefix required");
252
253 olh->count = 1;
254 olh->objsize = sizeof(*cfg);
255 olh->size = sizeof(buf);
256 strlcpy(cfg->name, name, sizeof(cfg->name));
257 if (do_set3(IP_FW_NAT64CLAT_CREATE, &olh->opheader, sizeof(buf)) != 0)
258 err(EX_OSERR, "nat64clat instance creation failed");
259 }
260
261 /*
262 * Configures existing nat64clat instance
263 * ipfw nat64clat <NAME> config <options>
264 * Request: [ ipfw_obj_header ipfw_nat64clat_cfg ]
265 */
266 static void
nat64clat_config(const char * name,uint8_t set,int ac,char ** av)267 nat64clat_config(const char *name, uint8_t set, int ac, char **av)
268 {
269 char buf[sizeof(ipfw_obj_header) + sizeof(ipfw_nat64clat_cfg)];
270 ipfw_nat64clat_cfg *cfg;
271 ipfw_obj_header *oh;
272 char *opt;
273 char *p;
274 size_t sz;
275 int tcmd;
276 struct in6_addr prefix;
277 uint8_t plen;
278
279 if (ac == 0)
280 errx(EX_USAGE, "config options required");
281 memset(&buf, 0, sizeof(buf));
282 oh = (ipfw_obj_header *)buf;
283 cfg = (ipfw_nat64clat_cfg *)(oh + 1);
284 sz = sizeof(buf);
285
286 nat64clat_fill_ntlv(&oh->ntlv, name, set);
287 if (do_get3(IP_FW_NAT64CLAT_CONFIG, &oh->opheader, &sz) != 0)
288 err(EX_OSERR, "failed to get config for instance %s", name);
289
290 while (ac > 0) {
291 tcmd = get_token(nat64newcmds, *av, "option");
292 opt = *av;
293 ac--; av++;
294
295 switch (tcmd) {
296 case TOK_PLAT_PREFIX:
297 case TOK_CLAT_PREFIX:
298 if (tcmd == TOK_PLAT_PREFIX) {
299 NEED1("IPv6 plat_prefix required");
300 } else {
301 NEED1("IPv6 clat_prefix required");
302 }
303
304 if ((p = strchr(*av, '/')) != NULL)
305 *p++ = '\0';
306 else
307 errx(EX_USAGE,
308 "Prefix length required: %s", *av);
309 if (inet_pton(AF_INET6, *av, &prefix) != 1)
310 errx(EX_USAGE,
311 "Bad prefix: %s", *av);
312 plen = strtol(p, NULL, 10);
313 if (ipfw_check_nat64prefix(&prefix, plen) != 0)
314 errx(EX_USAGE,
315 "Bad prefix length: %s", p);
316 if (tcmd == TOK_PLAT_PREFIX) {
317 cfg->plat_prefix = prefix;
318 cfg->plat_plen = plen;
319 } else {
320 cfg->clat_prefix = prefix;
321 cfg->clat_plen = plen;
322 }
323 ac--; av++;
324 break;
325 case TOK_LOG:
326 cfg->flags |= NAT64_LOG;
327 break;
328 case TOK_LOGOFF:
329 cfg->flags &= ~NAT64_LOG;
330 break;
331 case TOK_PRIVATE:
332 cfg->flags |= NAT64_ALLOW_PRIVATE;
333 break;
334 case TOK_PRIVATEOFF:
335 cfg->flags &= ~NAT64_ALLOW_PRIVATE;
336 break;
337 default:
338 errx(EX_USAGE, "Can't change %s option", opt);
339 }
340 }
341
342 if (do_set3(IP_FW_NAT64CLAT_CONFIG, &oh->opheader, sizeof(buf)) != 0)
343 err(EX_OSERR, "nat64clat instance configuration failed");
344 }
345
346 /*
347 * Destroys nat64clat instance.
348 * Request: [ ipfw_obj_header ]
349 */
350 static void
nat64clat_destroy(const char * name,uint8_t set)351 nat64clat_destroy(const char *name, uint8_t set)
352 {
353 ipfw_obj_header oh;
354
355 memset(&oh, 0, sizeof(oh));
356 nat64clat_fill_ntlv(&oh.ntlv, name, set);
357 if (do_set3(IP_FW_NAT64CLAT_DESTROY, &oh.opheader, sizeof(oh)) != 0)
358 err(EX_OSERR, "failed to destroy nat instance %s", name);
359 }
360
361 /*
362 * Get nat64clat instance statistics.
363 * Request: [ ipfw_obj_header ]
364 * Reply: [ ipfw_obj_header ipfw_obj_ctlv [ uint64_t x N ] ]
365 */
366 static int
nat64clat_get_stats(const char * name,uint8_t set,struct ipfw_nat64clat_stats * stats)367 nat64clat_get_stats(const char *name, uint8_t set,
368 struct ipfw_nat64clat_stats *stats)
369 {
370 ipfw_obj_header *oh;
371 ipfw_obj_ctlv *oc;
372 size_t sz;
373
374 sz = sizeof(*oh) + sizeof(*oc) + sizeof(*stats);
375 oh = calloc(1, sz);
376 nat64clat_fill_ntlv(&oh->ntlv, name, set);
377 if (do_get3(IP_FW_NAT64CLAT_STATS, &oh->opheader, &sz) == 0) {
378 oc = (ipfw_obj_ctlv *)(oh + 1);
379 memcpy(stats, oc + 1, sizeof(*stats));
380 free(oh);
381 return (0);
382 }
383 free(oh);
384 return (-1);
385 }
386
387 static void
nat64clat_stats(const char * name,uint8_t set)388 nat64clat_stats(const char *name, uint8_t set)
389 {
390 struct ipfw_nat64clat_stats stats;
391
392 if (nat64clat_get_stats(name, set, &stats) != 0)
393 err(EX_OSERR, "Error retrieving stats");
394
395 if (g_co.use_set != 0 || set != 0)
396 printf("set %u ", set);
397 printf("nat64clat %s\n", name);
398
399 printf("\t%ju packets translated from IPv6 to IPv4\n",
400 (uintmax_t)stats.opcnt64);
401 printf("\t%ju packets translated from IPv4 to IPv6\n",
402 (uintmax_t)stats.opcnt46);
403 printf("\t%ju IPv6 fragments created\n",
404 (uintmax_t)stats.ofrags);
405 printf("\t%ju IPv4 fragments received\n",
406 (uintmax_t)stats.ifrags);
407 printf("\t%ju output packets dropped due to no bufs, etc.\n",
408 (uintmax_t)stats.oerrors);
409 printf("\t%ju output packets discarded due to no IPv4 route\n",
410 (uintmax_t)stats.noroute4);
411 printf("\t%ju output packets discarded due to no IPv6 route\n",
412 (uintmax_t)stats.noroute6);
413 printf("\t%ju packets discarded due to unsupported protocol\n",
414 (uintmax_t)stats.noproto);
415 printf("\t%ju packets discarded due to memory allocation problems\n",
416 (uintmax_t)stats.nomem);
417 printf("\t%ju packets discarded due to some errors\n",
418 (uintmax_t)stats.dropped);
419 }
420
421 /*
422 * Reset nat64clat instance statistics specified by @oh->ntlv.
423 * Request: [ ipfw_obj_header ]
424 */
425 static void
nat64clat_reset_stats(const char * name,uint8_t set)426 nat64clat_reset_stats(const char *name, uint8_t set)
427 {
428 ipfw_obj_header oh;
429
430 memset(&oh, 0, sizeof(oh));
431 nat64clat_fill_ntlv(&oh.ntlv, name, set);
432 if (do_set3(IP_FW_NAT64CLAT_RESET_STATS, &oh.opheader, sizeof(oh)) != 0)
433 err(EX_OSERR, "failed to reset stats for instance %s", name);
434 }
435
436 static int
nat64clat_show_cb(ipfw_nat64clat_cfg * cfg,const char * name,uint8_t set)437 nat64clat_show_cb(ipfw_nat64clat_cfg *cfg, const char *name, uint8_t set)
438 {
439 char plat_buf[INET6_ADDRSTRLEN], clat_buf[INET6_ADDRSTRLEN];
440
441 if (name != NULL && strcmp(cfg->name, name) != 0)
442 return (ESRCH);
443
444 if (g_co.use_set != 0 && cfg->set != set)
445 return (ESRCH);
446
447 if (g_co.use_set != 0 || cfg->set != 0)
448 printf("set %u ", cfg->set);
449
450 inet_ntop(AF_INET6, &cfg->clat_prefix, clat_buf, sizeof(clat_buf));
451 inet_ntop(AF_INET6, &cfg->plat_prefix, plat_buf, sizeof(plat_buf));
452 printf("nat64clat %s clat_prefix %s/%u plat_prefix %s/%u",
453 cfg->name, clat_buf, cfg->clat_plen, plat_buf, cfg->plat_plen);
454 if (cfg->flags & NAT64_LOG)
455 printf(" log");
456 if (cfg->flags & NAT64_ALLOW_PRIVATE)
457 printf(" allow_private");
458 printf("\n");
459 return (0);
460 }
461
462 static int
nat64clat_destroy_cb(ipfw_nat64clat_cfg * cfg,const char * name __unused,uint8_t set)463 nat64clat_destroy_cb(ipfw_nat64clat_cfg *cfg, const char *name __unused,
464 uint8_t set)
465 {
466
467 if (g_co.use_set != 0 && cfg->set != set)
468 return (ESRCH);
469
470 nat64clat_destroy(cfg->name, cfg->set);
471 return (0);
472 }
473
474
475 /*
476 * Compare nat64clat instances names.
477 * Honor number comparison.
478 */
479 static int
nat64name_cmp(const void * a,const void * b)480 nat64name_cmp(const void *a, const void *b)
481 {
482 const ipfw_nat64clat_cfg *ca, *cb;
483
484 ca = (const ipfw_nat64clat_cfg *)a;
485 cb = (const ipfw_nat64clat_cfg *)b;
486
487 if (ca->set > cb->set)
488 return (1);
489 else if (ca->set < cb->set)
490 return (-1);
491 return (stringnum_cmp(ca->name, cb->name));
492 }
493
494 /*
495 * Retrieves nat64clat instance list from kernel,
496 * optionally sorts it and calls requested function for each instance.
497 *
498 * Request: [ ipfw_obj_lheader ]
499 * Reply: [ ipfw_obj_lheader ipfw_nat64clat_cfg x N ]
500 */
501 static int
nat64clat_foreach(nat64clat_cb_t * f,const char * name,uint8_t set,int sort)502 nat64clat_foreach(nat64clat_cb_t *f, const char *name, uint8_t set, int sort)
503 {
504 ipfw_obj_lheader *olh;
505 ipfw_nat64clat_cfg *cfg;
506 size_t sz;
507 uint32_t i;
508 int error;
509
510 /* Start with reasonable default */
511 sz = sizeof(*olh) + 16 * sizeof(*cfg);
512 for (;;) {
513 if ((olh = calloc(1, sz)) == NULL)
514 return (ENOMEM);
515
516 olh->size = sz;
517 if (do_get3(IP_FW_NAT64CLAT_LIST, &olh->opheader, &sz) != 0) {
518 sz = olh->size;
519 free(olh);
520 if (errno != ENOMEM)
521 return (errno);
522 continue;
523 }
524
525 if (sort != 0)
526 qsort(olh + 1, olh->count, olh->objsize,
527 nat64name_cmp);
528
529 cfg = (ipfw_nat64clat_cfg *)(olh + 1);
530 for (i = 0; i < olh->count; i++) {
531 error = f(cfg, name, set); /* Ignore errors for now */
532 cfg = (ipfw_nat64clat_cfg *)((caddr_t)cfg +
533 olh->objsize);
534 }
535 free(olh);
536 break;
537 }
538 return (0);
539 }
540
541