1 /*-
2 * Copyright (c) 2002-2003 Luigi Rizzo
3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
4 * Copyright (c) 1994 Ugen J.S.Antsilevich
5 *
6 * Idea and grammar partially left from:
7 * Copyright (c) 1993 Daniel Boulet
8 *
9 * Redistribution and use in source forms, with and without modification,
10 * are permitted provided that this entire comment appears intact.
11 *
12 * Redistribution in binary form may occur without any restrictions.
13 * Obviously, it would be nice if you gave credit where credit is due
14 * but requiring it would be too onerous.
15 *
16 * This software is provided ``AS IS'' without any warranties of any kind.
17 *
18 * NEW command line interface for IP firewall facility
19 *
20 * In-kernel nat support
21 */
22
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <sys/sysctl.h>
26
27 #include "ipfw2.h"
28
29 #include <ctype.h>
30 #include <err.h>
31 #include <errno.h>
32 #include <netdb.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <sysexits.h>
37
38 #include <net/if.h>
39 #include <net/if_dl.h>
40 #include <net/route.h> /* def. of struct route */
41 #include <netinet/in.h>
42 #include <netinet/ip_fw.h>
43 #include <arpa/inet.h>
44 #include <alias.h>
45
46 typedef int (nat_cb_t)(struct nat44_cfg_nat *cfg, void *arg);
47 static void nat_show_cfg(struct nat44_cfg_nat *n, void *arg);
48 static void nat_show_log(struct nat44_cfg_nat *n, void *arg);
49 static int nat_show_data(struct nat44_cfg_nat *cfg, void *arg);
50 static int natname_cmp(const void *a, const void *b);
51 static int nat_foreach(nat_cb_t *f, void *arg, int sort);
52 static int nat_get_cmd(char *name, uint16_t cmd, ipfw_obj_header **ooh);
53
54 static struct _s_x nat_params[] = {
55 { "ip", TOK_IP },
56 { "if", TOK_IF },
57 { "log", TOK_ALOG },
58 { "deny_in", TOK_DENY_INC },
59 { "same_ports", TOK_SAME_PORTS },
60 { "unreg_only", TOK_UNREG_ONLY },
61 { "unreg_cgn", TOK_UNREG_CGN },
62 { "skip_global", TOK_SKIP_GLOBAL },
63 { "reset", TOK_RESET_ADDR },
64 { "reverse", TOK_ALIAS_REV },
65 { "proxy_only", TOK_PROXY_ONLY },
66 { "port_range", TOK_PORT_ALIAS },
67 { "redirect_addr", TOK_REDIR_ADDR },
68 { "redirect_port", TOK_REDIR_PORT },
69 { "redirect_proto", TOK_REDIR_PROTO },
70 { "udp_eim", TOK_UDP_EIM },
71 { NULL, 0 } /* terminator */
72 };
73
74
75 /*
76 * Search for interface with name "ifn", and fill n accordingly:
77 *
78 * n->ip ip address of interface "ifn"
79 * n->if_name copy of interface name "ifn"
80 */
81 static void
set_addr_dynamic(const char * ifn,struct nat44_cfg_nat * n)82 set_addr_dynamic(const char *ifn, struct nat44_cfg_nat *n)
83 {
84 size_t needed;
85 int mib[6];
86 char *buf, *lim, *next;
87 struct if_msghdr *ifm;
88 struct ifa_msghdr *ifam;
89 struct sockaddr_dl *sdl;
90 struct sockaddr_in *sin;
91 int ifIndex;
92
93 mib[0] = CTL_NET;
94 mib[1] = PF_ROUTE;
95 mib[2] = 0;
96 mib[3] = AF_INET;
97 mib[4] = NET_RT_IFLIST;
98 mib[5] = 0;
99 /*
100 * Get interface data.
101 */
102 if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1)
103 err(1, "iflist-sysctl-estimate");
104 buf = safe_calloc(1, needed);
105 if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1)
106 err(1, "iflist-sysctl-get");
107 lim = buf + needed;
108 /*
109 * Loop through interfaces until one with
110 * given name is found. This is done to
111 * find correct interface index for routing
112 * message processing.
113 */
114 ifIndex = 0;
115 next = buf;
116 while (next < lim) {
117 ifm = (struct if_msghdr *)next;
118 next += ifm->ifm_msglen;
119 if (ifm->ifm_version != RTM_VERSION) {
120 if (g_co.verbose)
121 warnx("routing message version %d "
122 "not understood", ifm->ifm_version);
123 continue;
124 }
125 if (ifm->ifm_type == RTM_IFINFO) {
126 sdl = (struct sockaddr_dl *)(ifm + 1);
127 if (strlen(ifn) == sdl->sdl_nlen &&
128 strncmp(ifn, sdl->sdl_data, sdl->sdl_nlen) == 0) {
129 ifIndex = ifm->ifm_index;
130 break;
131 }
132 }
133 }
134 if (!ifIndex)
135 errx(1, "unknown interface name %s", ifn);
136 /*
137 * Get interface address.
138 */
139 sin = NULL;
140 while (next < lim) {
141 ifam = (struct ifa_msghdr *)next;
142 next += ifam->ifam_msglen;
143 if (ifam->ifam_version != RTM_VERSION) {
144 if (g_co.verbose)
145 warnx("routing message version %d "
146 "not understood", ifam->ifam_version);
147 continue;
148 }
149 if (ifam->ifam_type != RTM_NEWADDR)
150 break;
151 if (ifam->ifam_addrs & RTA_IFA) {
152 int i;
153 char *cp = (char *)(ifam + 1);
154
155 for (i = 1; i < RTA_IFA; i <<= 1) {
156 if (ifam->ifam_addrs & i)
157 cp += SA_SIZE((struct sockaddr *)cp);
158 }
159 if (((struct sockaddr *)cp)->sa_family == AF_INET) {
160 sin = (struct sockaddr_in *)cp;
161 break;
162 }
163 }
164 }
165 if (sin == NULL)
166 n->ip.s_addr = htonl(INADDR_ANY);
167 else
168 n->ip = sin->sin_addr;
169 strncpy(n->if_name, ifn, IF_NAMESIZE);
170
171 free(buf);
172 }
173
174 /*
175 * XXX - The following functions, macros and definitions come from natd.c:
176 * it would be better to move them outside natd.c, in a file
177 * (redirect_support.[ch]?) shared by ipfw and natd, but for now i can live
178 * with it.
179 */
180
181 /*
182 * Definition of a port range, and macros to deal with values.
183 * FORMAT: HI 16-bits == first port in range, 0 == all ports.
184 * LO 16-bits == number of ports in range
185 * NOTES: - Port values are not stored in network byte order.
186 */
187
188 #define port_range u_long
189
190 #define GETLOPORT(x) ((x) >> 0x10)
191 #define GETNUMPORTS(x) ((x) & 0x0000ffff)
192 #define GETHIPORT(x) (GETLOPORT((x)) + GETNUMPORTS((x)))
193
194 /* Set y to be the low-port value in port_range variable x. */
195 #define SETLOPORT(x,y) ((x) = ((x) & 0x0000ffff) | ((y) << 0x10))
196
197 /* Set y to be the number of ports in port_range variable x. */
198 #define SETNUMPORTS(x,y) ((x) = ((x) & 0xffff0000) | (y))
199
200 static void
StrToAddr(const char * str,struct in_addr * addr)201 StrToAddr (const char* str, struct in_addr* addr)
202 {
203 struct hostent* hp;
204
205 if (inet_aton (str, addr))
206 return;
207
208 hp = gethostbyname (str);
209 if (!hp)
210 errx (1, "unknown host %s", str);
211
212 memcpy (addr, hp->h_addr, sizeof (struct in_addr));
213 }
214
215 static int
StrToPortRange(const char * str,const char * proto,port_range * portRange)216 StrToPortRange (const char* str, const char* proto, port_range *portRange)
217 {
218 char* sep;
219 struct servent* sp;
220 char* end;
221 u_short loPort;
222 u_short hiPort;
223
224 /* First see if this is a service, return corresponding port if so. */
225 sp = getservbyname (str,proto);
226 if (sp) {
227 SETLOPORT(*portRange, ntohs(sp->s_port));
228 SETNUMPORTS(*portRange, 1);
229 return 0;
230 }
231
232 /* Not a service, see if it's a single port or port range. */
233 sep = strchr (str, '-');
234 if (sep == NULL) {
235 SETLOPORT(*portRange, strtol(str, &end, 10));
236 if (end != str) {
237 /* Single port. */
238 SETNUMPORTS(*portRange, 1);
239 return 0;
240 }
241
242 /* Error in port range field. */
243 errx (EX_DATAERR, "%s/%s: unknown service", str, proto);
244 }
245
246 /* Port range, get the values and sanity check. */
247 sscanf (str, "%hu-%hu", &loPort, &hiPort);
248 SETLOPORT(*portRange, loPort);
249 SETNUMPORTS(*portRange, 0); /* Error by default */
250 if (loPort <= hiPort)
251 SETNUMPORTS(*portRange, hiPort - loPort + 1);
252
253 if (GETNUMPORTS(*portRange) == 0)
254 errx (EX_DATAERR, "invalid port range %s", str);
255
256 return 0;
257 }
258
259 static int
StrToProto(const char * str)260 StrToProto (const char* str)
261 {
262 if (!strcmp (str, "tcp"))
263 return IPPROTO_TCP;
264
265 if (!strcmp (str, "udp"))
266 return IPPROTO_UDP;
267
268 if (!strcmp (str, "sctp"))
269 return IPPROTO_SCTP;
270 errx (EX_DATAERR, "unknown protocol %s. Expected sctp, tcp or udp", str);
271 }
272
273 static int
StrToAddrAndPortRange(const char * str,struct in_addr * addr,char * proto,port_range * portRange)274 StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto,
275 port_range *portRange)
276 {
277 char* ptr;
278
279 ptr = strchr (str, ':');
280 if (!ptr)
281 errx (EX_DATAERR, "%s is missing port number", str);
282
283 *ptr = '\0';
284 ++ptr;
285
286 StrToAddr (str, addr);
287 return StrToPortRange (ptr, proto, portRange);
288 }
289
290 /* End of stuff taken from natd.c. */
291
292 /*
293 * The next 3 functions add support for the addr, port and proto redirect and
294 * their logic is loosely based on SetupAddressRedirect(), SetupPortRedirect()
295 * and SetupProtoRedirect() from natd.c.
296 *
297 * Every setup_* function fills at least one redirect entry
298 * (struct nat44_cfg_redir) and zero or more server pool entry
299 * (struct nat44_cfg_spool) in buf.
300 *
301 * The format of data in buf is:
302 *
303 * nat44_cfg_nat nat44_cfg_redir nat44_cfg_spool ...... nat44_cfg_spool
304 *
305 * ------------------------------------- ------------
306 * | | .....X ..... | | | | .....
307 * ------------------------------------- ...... ------------
308 * ^
309 * spool_cnt n=0 ...... n=(X-1)
310 *
311 * len points to the amount of available space in buf
312 * space counts the memory consumed by every function
313 *
314 * XXX - Every function get all the argv params so it
315 * has to check, in optional parameters, that the next
316 * args is a valid option for the redir entry and not
317 * another token. Only redir_port and redir_proto are
318 * affected by this.
319 */
320
321 static int
estimate_redir_addr(int * ac,char *** av)322 estimate_redir_addr(int *ac, char ***av)
323 {
324 size_t space = sizeof(struct nat44_cfg_redir);
325 char *sep = **av;
326 u_int c = 0;
327
328 (void)ac; /* UNUSED */
329 while ((sep = strchr(sep, ',')) != NULL) {
330 c++;
331 sep++;
332 }
333
334 if (c > 0)
335 c++;
336
337 space += c * sizeof(struct nat44_cfg_spool);
338
339 return (space);
340 }
341
342 static int
setup_redir_addr(char * buf,int * ac,char *** av)343 setup_redir_addr(char *buf, int *ac, char ***av)
344 {
345 struct nat44_cfg_redir *r;
346 char *sep;
347 size_t space;
348
349 r = (struct nat44_cfg_redir *)buf;
350 r->mode = REDIR_ADDR;
351 /* Skip nat44_cfg_redir at beginning of buf. */
352 buf = &buf[sizeof(struct nat44_cfg_redir)];
353 space = sizeof(struct nat44_cfg_redir);
354
355 /* Extract local address. */
356 if (strchr(**av, ',') != NULL) {
357 struct nat44_cfg_spool *spool;
358
359 /* Setup LSNAT server pool. */
360 r->laddr.s_addr = INADDR_NONE;
361 sep = strtok(**av, ",");
362 while (sep != NULL) {
363 spool = (struct nat44_cfg_spool *)buf;
364 space += sizeof(struct nat44_cfg_spool);
365 StrToAddr(sep, &spool->addr);
366 spool->port = ~0;
367 r->spool_cnt++;
368 /* Point to the next possible nat44_cfg_spool. */
369 buf = &buf[sizeof(struct nat44_cfg_spool)];
370 sep = strtok(NULL, ",");
371 }
372 } else
373 StrToAddr(**av, &r->laddr);
374 (*av)++; (*ac)--;
375
376 /* Extract public address. */
377 StrToAddr(**av, &r->paddr);
378 (*av)++; (*ac)--;
379
380 return (space);
381 }
382
383 static int
estimate_redir_port(int * ac,char *** av)384 estimate_redir_port(int *ac, char ***av)
385 {
386 size_t space = sizeof(struct nat44_cfg_redir);
387 char *sep = **av;
388 u_int c = 0;
389
390 (void)ac; /* UNUSED */
391 while ((sep = strchr(sep, ',')) != NULL) {
392 c++;
393 sep++;
394 }
395
396 if (c > 0)
397 c++;
398
399 space += c * sizeof(struct nat44_cfg_spool);
400
401 return (space);
402 }
403
404 static int
setup_redir_port(char * buf,int * ac,char *** av)405 setup_redir_port(char *buf, int *ac, char ***av)
406 {
407 struct nat44_cfg_redir *r;
408 char *sep, *protoName, *lsnat = NULL;
409 size_t space;
410 u_short numLocalPorts;
411 port_range portRange;
412
413 numLocalPorts = 0;
414
415 r = (struct nat44_cfg_redir *)buf;
416 r->mode = REDIR_PORT;
417 /* Skip nat44_cfg_redir at beginning of buf. */
418 buf = &buf[sizeof(struct nat44_cfg_redir)];
419 space = sizeof(struct nat44_cfg_redir);
420
421 /*
422 * Extract protocol.
423 */
424 r->proto = StrToProto(**av);
425 protoName = **av;
426 (*av)++; (*ac)--;
427
428 /*
429 * Extract local address.
430 */
431 if (strchr(**av, ',') != NULL) {
432 r->laddr.s_addr = INADDR_NONE;
433 r->lport = ~0;
434 numLocalPorts = 1;
435 lsnat = **av;
436 } else {
437 /*
438 * The sctp nat does not allow the port numbers to be mapped to
439 * new port numbers. Therefore, no ports are to be specified
440 * in the target port field.
441 */
442 if (r->proto == IPPROTO_SCTP) {
443 if (strchr(**av, ':'))
444 errx(EX_DATAERR, "redirect_port:"
445 "port numbers do not change in sctp, so do "
446 "not specify them as part of the target");
447 else
448 StrToAddr(**av, &r->laddr);
449 } else {
450 if (StrToAddrAndPortRange(**av, &r->laddr, protoName,
451 &portRange) != 0)
452 errx(EX_DATAERR, "redirect_port: "
453 "invalid local port range");
454
455 r->lport = GETLOPORT(portRange);
456 numLocalPorts = GETNUMPORTS(portRange);
457 }
458 }
459 (*av)++; (*ac)--;
460
461 /*
462 * Extract public port and optionally address.
463 */
464 if (strchr(**av, ':') != NULL) {
465 if (StrToAddrAndPortRange(**av, &r->paddr, protoName,
466 &portRange) != 0)
467 errx(EX_DATAERR, "redirect_port: "
468 "invalid public port range");
469 } else {
470 r->paddr.s_addr = INADDR_ANY;
471 if (StrToPortRange(**av, protoName, &portRange) != 0)
472 errx(EX_DATAERR, "redirect_port: "
473 "invalid public port range");
474 }
475
476 r->pport = GETLOPORT(portRange);
477 if (r->proto == IPPROTO_SCTP) { /* so the logic below still works */
478 numLocalPorts = GETNUMPORTS(portRange);
479 r->lport = r->pport;
480 }
481 r->pport_cnt = GETNUMPORTS(portRange);
482 (*av)++; (*ac)--;
483
484 /*
485 * Extract remote address and optionally port.
486 */
487 /*
488 * NB: isdigit(**av) => we've to check that next parameter is really an
489 * option for this redirect entry, else stop here processing arg[cv].
490 */
491 if (*ac != 0 && isdigit(***av)) {
492 if (strchr(**av, ':') != NULL) {
493 if (StrToAddrAndPortRange(**av, &r->raddr, protoName,
494 &portRange) != 0)
495 errx(EX_DATAERR, "redirect_port: "
496 "invalid remote port range");
497 } else {
498 SETLOPORT(portRange, 0);
499 SETNUMPORTS(portRange, 1);
500 StrToAddr(**av, &r->raddr);
501 }
502 (*av)++; (*ac)--;
503 } else {
504 SETLOPORT(portRange, 0);
505 SETNUMPORTS(portRange, 1);
506 r->raddr.s_addr = INADDR_ANY;
507 }
508 r->rport = GETLOPORT(portRange);
509 r->rport_cnt = GETNUMPORTS(portRange);
510
511 /*
512 * Make sure port ranges match up, then add the redirect ports.
513 */
514 if (numLocalPorts != r->pport_cnt)
515 errx(EX_DATAERR, "redirect_port: "
516 "port ranges must be equal in size");
517
518 /* Remote port range is allowed to be '0' which means all ports. */
519 if (r->rport_cnt != numLocalPorts &&
520 (r->rport_cnt != 1 || r->rport != 0))
521 errx(EX_DATAERR, "redirect_port: remote port must"
522 "be 0 or equal to local port range in size");
523
524 /* Setup LSNAT server pool. */
525 if (lsnat != NULL) {
526 struct nat44_cfg_spool *spool;
527
528 sep = strtok(lsnat, ",");
529 while (sep != NULL) {
530 spool = (struct nat44_cfg_spool *)buf;
531 space += sizeof(struct nat44_cfg_spool);
532 /*
533 * The sctp nat does not allow the port numbers to
534 * be mapped to new port numbers. Therefore, no ports
535 * are to be specified in the target port field.
536 */
537 if (r->proto == IPPROTO_SCTP) {
538 if (strchr (sep, ':')) {
539 errx(EX_DATAERR, "redirect_port:"
540 "port numbers do not change in "
541 "sctp, so do not specify them as "
542 "part of the target");
543 } else {
544 StrToAddr(sep, &spool->addr);
545 spool->port = r->pport;
546 }
547 } else {
548 if (StrToAddrAndPortRange(sep, &spool->addr,
549 protoName, &portRange) != 0)
550 errx(EX_DATAERR, "redirect_port:"
551 "invalid local port range");
552 if (GETNUMPORTS(portRange) != 1)
553 errx(EX_DATAERR, "redirect_port: "
554 "local port must be single in "
555 "this context");
556 spool->port = GETLOPORT(portRange);
557 }
558 r->spool_cnt++;
559 /* Point to the next possible nat44_cfg_spool. */
560 buf = &buf[sizeof(struct nat44_cfg_spool)];
561 sep = strtok(NULL, ",");
562 }
563 }
564
565 return (space);
566 }
567
568 static int
setup_redir_proto(char * buf,int * ac,char *** av)569 setup_redir_proto(char *buf, int *ac, char ***av)
570 {
571 struct nat44_cfg_redir *r;
572 struct protoent *protoent;
573 size_t space;
574
575 r = (struct nat44_cfg_redir *)buf;
576 r->mode = REDIR_PROTO;
577 /* Skip nat44_cfg_redir at beginning of buf. */
578 buf = &buf[sizeof(struct nat44_cfg_redir)];
579 space = sizeof(struct nat44_cfg_redir);
580
581 /*
582 * Extract protocol.
583 */
584 protoent = getprotobyname(**av);
585 if (protoent == NULL)
586 errx(EX_DATAERR, "redirect_proto: unknown protocol %s", **av);
587 else
588 r->proto = protoent->p_proto;
589
590 (*av)++; (*ac)--;
591
592 /*
593 * Extract local address.
594 */
595 StrToAddr(**av, &r->laddr);
596
597 (*av)++; (*ac)--;
598
599 /*
600 * Extract optional public address.
601 */
602 if (*ac == 0) {
603 r->paddr.s_addr = INADDR_ANY;
604 r->raddr.s_addr = INADDR_ANY;
605 } else {
606 /* see above in setup_redir_port() */
607 if (isdigit(***av)) {
608 StrToAddr(**av, &r->paddr);
609 (*av)++; (*ac)--;
610
611 /*
612 * Extract optional remote address.
613 */
614 /* see above in setup_redir_port() */
615 if (*ac != 0 && isdigit(***av)) {
616 StrToAddr(**av, &r->raddr);
617 (*av)++; (*ac)--;
618 }
619 }
620 }
621
622 return (space);
623 }
624
625 static void
nat_show_log(struct nat44_cfg_nat * n,void * arg __unused)626 nat_show_log(struct nat44_cfg_nat *n, void *arg __unused)
627 {
628 char *buf;
629
630 buf = (char *)(n + 1);
631 if (buf[0] != '\0')
632 printf("nat %s: %s\n", n->name, buf);
633 }
634
635 static void
nat_show_cfg(struct nat44_cfg_nat * n,void * arg __unused)636 nat_show_cfg(struct nat44_cfg_nat *n, void *arg __unused)
637 {
638 struct nat44_cfg_redir *t;
639 struct nat44_cfg_spool *s;
640 caddr_t buf;
641 struct protoent *p;
642 uint32_t cnt;
643 int i, off;
644
645 buf = (caddr_t)n;
646 off = sizeof(*n);
647 printf("ipfw nat %s config", n->name);
648 if (strlen(n->if_name) != 0)
649 printf(" if %s", n->if_name);
650 else if (n->ip.s_addr != 0)
651 printf(" ip %s", inet_ntoa(n->ip));
652 while (n->mode != 0) {
653 if (n->mode & PKT_ALIAS_LOG) {
654 printf(" log");
655 n->mode &= ~PKT_ALIAS_LOG;
656 } else if (n->mode & PKT_ALIAS_DENY_INCOMING) {
657 printf(" deny_in");
658 n->mode &= ~PKT_ALIAS_DENY_INCOMING;
659 } else if (n->mode & PKT_ALIAS_SAME_PORTS) {
660 printf(" same_ports");
661 n->mode &= ~PKT_ALIAS_SAME_PORTS;
662 } else if (n->mode & PKT_ALIAS_SKIP_GLOBAL) {
663 printf(" skip_global");
664 n->mode &= ~PKT_ALIAS_SKIP_GLOBAL;
665 } else if (n->mode & PKT_ALIAS_UNREGISTERED_ONLY) {
666 printf(" unreg_only");
667 n->mode &= ~PKT_ALIAS_UNREGISTERED_ONLY;
668 } else if (n->mode & PKT_ALIAS_UNREGISTERED_CGN) {
669 printf(" unreg_cgn");
670 n->mode &= ~PKT_ALIAS_UNREGISTERED_CGN;
671 } else if (n->mode & PKT_ALIAS_RESET_ON_ADDR_CHANGE) {
672 printf(" reset");
673 n->mode &= ~PKT_ALIAS_RESET_ON_ADDR_CHANGE;
674 } else if (n->mode & PKT_ALIAS_REVERSE) {
675 printf(" reverse");
676 n->mode &= ~PKT_ALIAS_REVERSE;
677 } else if (n->mode & PKT_ALIAS_PROXY_ONLY) {
678 printf(" proxy_only");
679 n->mode &= ~PKT_ALIAS_PROXY_ONLY;
680 } else if (n->mode & PKT_ALIAS_UDP_EIM) {
681 printf(" udp_eim");
682 n->mode &= ~PKT_ALIAS_UDP_EIM;
683 }
684 }
685 /* Print all the redirect's data configuration. */
686 for (cnt = 0; cnt < n->redir_cnt; cnt++) {
687 t = (struct nat44_cfg_redir *)&buf[off];
688 off += sizeof(struct nat44_cfg_redir);
689 switch (t->mode) {
690 case REDIR_ADDR:
691 printf(" redirect_addr");
692 if (t->spool_cnt == 0)
693 printf(" %s", inet_ntoa(t->laddr));
694 else
695 for (i = 0; i < t->spool_cnt; i++) {
696 s = (struct nat44_cfg_spool *)&buf[off];
697 if (i)
698 printf(",");
699 else
700 printf(" ");
701 printf("%s", inet_ntoa(s->addr));
702 off += sizeof(struct nat44_cfg_spool);
703 }
704 printf(" %s", inet_ntoa(t->paddr));
705 break;
706 case REDIR_PORT:
707 p = getprotobynumber(t->proto);
708 printf(" redirect_port %s ", p->p_name);
709 if (!t->spool_cnt) {
710 printf("%s:%u", inet_ntoa(t->laddr), t->lport);
711 if (t->pport_cnt > 1)
712 printf("-%u", t->lport +
713 t->pport_cnt - 1);
714 } else
715 for (i=0; i < t->spool_cnt; i++) {
716 s = (struct nat44_cfg_spool *)&buf[off];
717 if (i)
718 printf(",");
719 printf("%s:%u", inet_ntoa(s->addr),
720 s->port);
721 off += sizeof(struct nat44_cfg_spool);
722 }
723
724 printf(" ");
725 if (t->paddr.s_addr)
726 printf("%s:", inet_ntoa(t->paddr));
727 printf("%u", t->pport);
728 if (!t->spool_cnt && t->pport_cnt > 1)
729 printf("-%u", t->pport + t->pport_cnt - 1);
730
731 if (t->raddr.s_addr) {
732 printf(" %s", inet_ntoa(t->raddr));
733 if (t->rport) {
734 printf(":%u", t->rport);
735 if (!t->spool_cnt && t->rport_cnt > 1)
736 printf("-%u", t->rport +
737 t->rport_cnt - 1);
738 }
739 }
740 break;
741 case REDIR_PROTO:
742 p = getprotobynumber(t->proto);
743 printf(" redirect_proto %s %s", p->p_name,
744 inet_ntoa(t->laddr));
745 if (t->paddr.s_addr != 0) {
746 printf(" %s", inet_ntoa(t->paddr));
747 if (t->raddr.s_addr)
748 printf(" %s", inet_ntoa(t->raddr));
749 }
750 break;
751 default:
752 errx(EX_DATAERR, "unknown redir mode");
753 break;
754 }
755 }
756 printf("\n");
757 }
758
759 static int
nat_port_alias_parse(char * str,u_short * lpout,u_short * hpout)760 nat_port_alias_parse(char *str, u_short *lpout, u_short *hpout) {
761 long lp, hp;
762 char *ptr;
763 /* Lower port parsing */
764 lp = (long) strtol(str, &ptr, 10);
765 if (lp < 1024 || lp > 65535)
766 return 0;
767 if (!ptr || *ptr != '-')
768 return 0;
769 /* Upper port parsing */
770 hp = (long) strtol(ptr, &ptr, 10);
771 if (hp < 1024 || hp > 65535)
772 return 0;
773 if (ptr)
774 return 0;
775
776 *lpout = (u_short) lp;
777 *hpout = (u_short) hp;
778 return 1;
779 }
780
781 void
ipfw_config_nat(int ac,char ** av)782 ipfw_config_nat(int ac, char **av)
783 {
784 ipfw_obj_header *oh;
785 struct nat44_cfg_nat *n; /* Nat instance configuration. */
786 int i, off, tok, ac1;
787 u_short lp, hp;
788 char *id, *buf, **av1, *end;
789 size_t len;
790
791 av++;
792 ac--;
793 /* Nat id. */
794 if (ac == 0)
795 errx(EX_DATAERR, "missing nat id");
796 id = *av;
797 i = (int)strtol(id, &end, 0);
798 if (i <= 0 || *end != '\0')
799 errx(EX_DATAERR, "illegal nat id: %s", id);
800 av++;
801 ac--;
802 if (ac == 0)
803 errx(EX_DATAERR, "missing option");
804
805 len = sizeof(*oh) + sizeof(*n);
806 ac1 = ac;
807 av1 = av;
808 while (ac1 > 0) {
809 tok = match_token(nat_params, *av1);
810 ac1--;
811 av1++;
812 switch (tok) {
813 case TOK_IP:
814 case TOK_IF:
815 case TOK_PORT_ALIAS:
816 ac1--;
817 av1++;
818 break;
819 case TOK_ALOG:
820 case TOK_DENY_INC:
821 case TOK_SAME_PORTS:
822 case TOK_SKIP_GLOBAL:
823 case TOK_UNREG_ONLY:
824 case TOK_UNREG_CGN:
825 case TOK_RESET_ADDR:
826 case TOK_ALIAS_REV:
827 case TOK_PROXY_ONLY:
828 case TOK_UDP_EIM:
829 break;
830 case TOK_REDIR_ADDR:
831 if (ac1 < 2)
832 errx(EX_DATAERR, "redirect_addr: "
833 "not enough arguments");
834 len += estimate_redir_addr(&ac1, &av1);
835 av1 += 2;
836 ac1 -= 2;
837 break;
838 case TOK_REDIR_PORT:
839 if (ac1 < 3)
840 errx(EX_DATAERR, "redirect_port: "
841 "not enough arguments");
842 av1++;
843 ac1--;
844 len += estimate_redir_port(&ac1, &av1);
845 av1 += 2;
846 ac1 -= 2;
847 /* Skip optional remoteIP/port */
848 if (ac1 != 0 && isdigit(**av1)) {
849 av1++;
850 ac1--;
851 }
852 break;
853 case TOK_REDIR_PROTO:
854 if (ac1 < 2)
855 errx(EX_DATAERR, "redirect_proto: "
856 "not enough arguments");
857 len += sizeof(struct nat44_cfg_redir);
858 av1 += 2;
859 ac1 -= 2;
860 /* Skip optional remoteIP/port */
861 if (ac1 != 0 && isdigit(**av1)) {
862 av1++;
863 ac1--;
864 }
865 if (ac1 != 0 && isdigit(**av1)) {
866 av1++;
867 ac1--;
868 }
869 break;
870 default:
871 errx(EX_DATAERR, "unrecognised option ``%s''", av1[-1]);
872 }
873 }
874
875 if ((buf = malloc(len)) == NULL)
876 errx(EX_OSERR, "malloc failed");
877
878 /* Offset in buf: save space for header at the beginning. */
879 off = sizeof(*oh) + sizeof(*n);
880 memset(buf, 0, len);
881 oh = (ipfw_obj_header *)buf;
882 n = (struct nat44_cfg_nat *)(oh + 1);
883 oh->ntlv.head.length = sizeof(oh->ntlv);
884 snprintf(oh->ntlv.name, sizeof(oh->ntlv.name), "%d", i);
885 snprintf(n->name, sizeof(n->name), "%d", i);
886
887 while (ac > 0) {
888 tok = match_token(nat_params, *av);
889 ac--;
890 av++;
891 switch (tok) {
892 case TOK_IP:
893 if (ac == 0)
894 errx(EX_DATAERR, "missing option");
895 if (!inet_aton(av[0], &(n->ip)))
896 errx(EX_DATAERR, "bad ip address ``%s''",
897 av[0]);
898 ac--;
899 av++;
900 break;
901 case TOK_IF:
902 if (ac == 0)
903 errx(EX_DATAERR, "missing option");
904 set_addr_dynamic(av[0], n);
905 ac--;
906 av++;
907 break;
908 case TOK_ALOG:
909 n->mode |= PKT_ALIAS_LOG;
910 break;
911 case TOK_DENY_INC:
912 n->mode |= PKT_ALIAS_DENY_INCOMING;
913 break;
914 case TOK_SAME_PORTS:
915 n->mode |= PKT_ALIAS_SAME_PORTS;
916 break;
917 case TOK_UNREG_ONLY:
918 n->mode |= PKT_ALIAS_UNREGISTERED_ONLY;
919 break;
920 case TOK_UNREG_CGN:
921 n->mode |= PKT_ALIAS_UNREGISTERED_CGN;
922 break;
923 case TOK_SKIP_GLOBAL:
924 n->mode |= PKT_ALIAS_SKIP_GLOBAL;
925 break;
926 case TOK_RESET_ADDR:
927 n->mode |= PKT_ALIAS_RESET_ON_ADDR_CHANGE;
928 break;
929 case TOK_ALIAS_REV:
930 n->mode |= PKT_ALIAS_REVERSE;
931 break;
932 case TOK_PROXY_ONLY:
933 n->mode |= PKT_ALIAS_PROXY_ONLY;
934 break;
935 case TOK_UDP_EIM:
936 n->mode |= PKT_ALIAS_UDP_EIM;
937 break;
938 /*
939 * All the setup_redir_* functions work directly in
940 * the final buffer, see above for details.
941 */
942 case TOK_REDIR_ADDR:
943 case TOK_REDIR_PORT:
944 case TOK_REDIR_PROTO:
945 switch (tok) {
946 case TOK_REDIR_ADDR:
947 i = setup_redir_addr(&buf[off], &ac, &av);
948 break;
949 case TOK_REDIR_PORT:
950 i = setup_redir_port(&buf[off], &ac, &av);
951 break;
952 case TOK_REDIR_PROTO:
953 i = setup_redir_proto(&buf[off], &ac, &av);
954 break;
955 }
956 n->redir_cnt++;
957 off += i;
958 break;
959 case TOK_PORT_ALIAS:
960 if (ac == 0)
961 errx(EX_DATAERR, "missing option");
962 if (!nat_port_alias_parse(av[0], &lp, &hp))
963 errx(EX_DATAERR,
964 "You need a range of port(s) from 1024 <= x < 65536");
965 if (lp >= hp)
966 errx(EX_DATAERR,
967 "Upper port has to be greater than lower port");
968 n->alias_port_lo = lp;
969 n->alias_port_hi = hp;
970 ac--;
971 av++;
972 break;
973 }
974 }
975 if (n->mode & PKT_ALIAS_SAME_PORTS && n->alias_port_lo)
976 errx(EX_DATAERR, "same_ports and port_range cannot both be selected");
977
978 i = do_set3(IP_FW_NAT44_XCONFIG, &oh->opheader, len);
979 if (i != 0)
980 err(1, "setsockopt(%s)", "IP_FW_NAT44_XCONFIG");
981
982 if (!g_co.do_quiet) {
983 /* After every modification, we show the resultant rule. */
984 int _ac = 3;
985 const char *_av[] = {"show", "config", id};
986 ipfw_show_nat(_ac, (char **)(void *)_av);
987 }
988 }
989
990 static void
nat_fill_ntlv(ipfw_obj_ntlv * ntlv,int i)991 nat_fill_ntlv(ipfw_obj_ntlv *ntlv, int i)
992 {
993
994 ntlv->head.type = IPFW_TLV_EACTION_NAME(1); /* it doesn't matter */
995 ntlv->head.length = sizeof(ipfw_obj_ntlv);
996 ntlv->idx = 1;
997 ntlv->set = 0; /* not yet */
998 snprintf(ntlv->name, sizeof(ntlv->name), "%d", i);
999 }
1000
1001 int
ipfw_delete_nat(int i)1002 ipfw_delete_nat(int i)
1003 {
1004 ipfw_obj_header oh;
1005 int ret;
1006
1007 memset(&oh, 0, sizeof(oh));
1008 nat_fill_ntlv(&oh.ntlv, i);
1009 ret = do_set3(IP_FW_NAT44_DESTROY, &oh.opheader, sizeof(oh));
1010 if (ret == -1) {
1011 if (!g_co.do_quiet)
1012 warn("nat %u not available", i);
1013 return (EX_UNAVAILABLE);
1014 }
1015 return (EX_OK);
1016 }
1017
1018 struct nat_list_arg {
1019 uint16_t cmd;
1020 int is_all;
1021 };
1022
1023 static int
nat_show_data(struct nat44_cfg_nat * cfg,void * arg)1024 nat_show_data(struct nat44_cfg_nat *cfg, void *arg)
1025 {
1026 struct nat_list_arg *nla;
1027 ipfw_obj_header *oh;
1028
1029 nla = (struct nat_list_arg *)arg;
1030
1031 switch (nla->cmd) {
1032 case IP_FW_NAT44_XGETCONFIG:
1033 if (nat_get_cmd(cfg->name, nla->cmd, &oh) != 0) {
1034 warnx("Error getting nat instance %s info", cfg->name);
1035 break;
1036 }
1037 nat_show_cfg((struct nat44_cfg_nat *)(oh + 1), NULL);
1038 free(oh);
1039 break;
1040 case IP_FW_NAT44_XGETLOG:
1041 if (nat_get_cmd(cfg->name, nla->cmd, &oh) == 0) {
1042 nat_show_log((struct nat44_cfg_nat *)(oh + 1), NULL);
1043 free(oh);
1044 break;
1045 }
1046 /* Handle error */
1047 if (nla->is_all != 0 && errno == ENOENT)
1048 break;
1049 warn("Error getting nat instance %s info", cfg->name);
1050 break;
1051 }
1052
1053 return (0);
1054 }
1055
1056 /*
1057 * Compare nat names.
1058 * Honor number comparison.
1059 */
1060 static int
natname_cmp(const void * a,const void * b)1061 natname_cmp(const void *a, const void *b)
1062 {
1063 const struct nat44_cfg_nat *ia, *ib;
1064
1065 ia = (const struct nat44_cfg_nat *)a;
1066 ib = (const struct nat44_cfg_nat *)b;
1067
1068 return (stringnum_cmp(ia->name, ib->name));
1069 }
1070
1071 /*
1072 * Retrieves nat list from kernel,
1073 * optionally sorts it and calls requested function for each table.
1074 * Returns 0 on success.
1075 */
1076 static int
nat_foreach(nat_cb_t * f,void * arg,int sort)1077 nat_foreach(nat_cb_t *f, void *arg, int sort)
1078 {
1079 ipfw_obj_lheader *olh;
1080 struct nat44_cfg_nat *cfg;
1081 size_t sz;
1082 uint32_t i;
1083
1084 /* Start with reasonable default */
1085 sz = sizeof(*olh) + 16 * sizeof(struct nat44_cfg_nat);
1086
1087 for (;;) {
1088 if ((olh = calloc(1, sz)) == NULL)
1089 return (ENOMEM);
1090
1091 olh->size = sz;
1092 if (do_get3(IP_FW_NAT44_LIST_NAT, &olh->opheader, &sz) != 0) {
1093 sz = olh->size;
1094 free(olh);
1095 if (errno == ENOMEM)
1096 continue;
1097 return (errno);
1098 }
1099
1100 if (sort != 0)
1101 qsort(olh + 1, olh->count, olh->objsize, natname_cmp);
1102
1103 cfg = (struct nat44_cfg_nat*)(olh + 1);
1104 for (i = 0; i < olh->count; i++) {
1105 (void)f(cfg, arg); /* Ignore errors for now */
1106 cfg = (struct nat44_cfg_nat *)((caddr_t)cfg +
1107 olh->objsize);
1108 }
1109
1110 free(olh);
1111 break;
1112 }
1113
1114 return (0);
1115 }
1116
1117 static int
nat_get_cmd(char * name,uint16_t cmd,ipfw_obj_header ** ooh)1118 nat_get_cmd(char *name, uint16_t cmd, ipfw_obj_header **ooh)
1119 {
1120 ipfw_obj_header *oh;
1121 struct nat44_cfg_nat *cfg;
1122 size_t sz;
1123
1124 /* Start with reasonable default */
1125 sz = sizeof(*oh) + sizeof(*cfg) + 128;
1126
1127 for (;;) {
1128 if ((oh = calloc(1, sz)) == NULL)
1129 return (ENOMEM);
1130 cfg = (struct nat44_cfg_nat *)(oh + 1);
1131 oh->ntlv.head.length = sizeof(oh->ntlv);
1132 strlcpy(oh->ntlv.name, name, sizeof(oh->ntlv.name));
1133 strlcpy(cfg->name, name, sizeof(cfg->name));
1134
1135 if (do_get3(cmd, &oh->opheader, &sz) != 0) {
1136 sz = cfg->size;
1137 free(oh);
1138 if (errno == ENOMEM)
1139 continue;
1140 return (errno);
1141 }
1142
1143 *ooh = oh;
1144 break;
1145 }
1146
1147 return (0);
1148 }
1149
1150 void
ipfw_show_nat(int ac,char ** av)1151 ipfw_show_nat(int ac, char **av)
1152 {
1153 ipfw_obj_header *oh;
1154 char *name;
1155 int cmd;
1156 struct nat_list_arg nla;
1157
1158 ac--;
1159 av++;
1160
1161 if (g_co.test_only)
1162 return;
1163
1164 /* Parse parameters. */
1165 cmd = 0; /* XXX: Change to IP_FW_NAT44_XGETLOG @ MFC */
1166 name = NULL;
1167 for ( ; ac != 0; ac--, av++) {
1168 if (!strncmp(av[0], "config", strlen(av[0]))) {
1169 cmd = IP_FW_NAT44_XGETCONFIG;
1170 continue;
1171 }
1172 if (strcmp(av[0], "log") == 0) {
1173 cmd = IP_FW_NAT44_XGETLOG;
1174 continue;
1175 }
1176 if (name != NULL)
1177 err(EX_USAGE,"only one instance name may be specified");
1178 name = av[0];
1179 }
1180
1181 if (cmd == 0)
1182 errx(EX_USAGE, "Please specify action. Available: config,log");
1183
1184 if (name == NULL) {
1185 memset(&nla, 0, sizeof(nla));
1186 nla.cmd = cmd;
1187 nla.is_all = 1;
1188 nat_foreach(nat_show_data, &nla, 1);
1189 } else {
1190 if (nat_get_cmd(name, cmd, &oh) != 0)
1191 err(EX_OSERR, "Error getting nat %s instance info", name);
1192 nat_show_cfg((struct nat44_cfg_nat *)(oh + 1), NULL);
1193 free(oh);
1194 }
1195 }
1196
1197