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