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