1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2008 Paolo Pisati
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/eventhandler.h>
35 #include <sys/malloc.h>
36 #include <sys/mbuf.h>
37 #include <sys/kernel.h>
38 #include <sys/lock.h>
39 #include <sys/module.h>
40 #include <sys/rwlock.h>
41 #include <sys/rmlock.h>
42
43 #include <netinet/libalias/alias.h>
44 #include <netinet/libalias/alias_local.h>
45
46 #include <net/if.h>
47 #include <net/if_var.h>
48 #include <netinet/in.h>
49 #include <netinet/ip.h>
50 #include <netinet/ip_var.h>
51 #include <netinet/ip_fw.h>
52 #include <netinet/tcp.h>
53 #include <netinet/udp.h>
54
55 #include <netpfil/ipfw/ip_fw_private.h>
56
57 #include <machine/in_cksum.h> /* XXX for in_cksum */
58
59 struct cfg_spool {
60 LIST_ENTRY(cfg_spool) _next; /* chain of spool instances */
61 struct in_addr addr;
62 uint16_t port;
63 };
64
65 /* Nat redirect configuration. */
66 struct cfg_redir {
67 LIST_ENTRY(cfg_redir) _next; /* chain of redir instances */
68 uint16_t mode; /* type of redirect mode */
69 uint16_t proto; /* protocol: tcp/udp */
70 struct in_addr laddr; /* local ip address */
71 struct in_addr paddr; /* public ip address */
72 struct in_addr raddr; /* remote ip address */
73 uint16_t lport; /* local port */
74 uint16_t pport; /* public port */
75 uint16_t rport; /* remote port */
76 uint16_t pport_cnt; /* number of public ports */
77 uint16_t rport_cnt; /* number of remote ports */
78 struct alias_link **alink;
79 u_int16_t spool_cnt; /* num of entry in spool chain */
80 /* chain of spool instances */
81 LIST_HEAD(spool_chain, cfg_spool) spool_chain;
82 };
83
84 /* Nat configuration data struct. */
85 struct cfg_nat {
86 /* chain of nat instances */
87 LIST_ENTRY(cfg_nat) _next;
88 int id; /* nat id */
89 struct in_addr ip; /* nat ip address */
90 struct libalias *lib; /* libalias instance */
91 int mode; /* aliasing mode */
92 int redir_cnt; /* number of entry in spool chain */
93 /* chain of redir instances */
94 LIST_HEAD(redir_chain, cfg_redir) redir_chain;
95 char if_name[IF_NAMESIZE]; /* interface name */
96 };
97
98 static eventhandler_tag ifaddr_event_tag;
99
100 static void
ifaddr_change(void * arg __unused,struct ifnet * ifp)101 ifaddr_change(void *arg __unused, struct ifnet *ifp)
102 {
103 struct cfg_nat *ptr;
104 struct ifaddr *ifa;
105 struct ip_fw_chain *chain;
106
107 KASSERT(curvnet == ifp->if_vnet,
108 ("curvnet(%p) differs from iface vnet(%p)", curvnet, ifp->if_vnet));
109
110 if (V_ipfw_vnet_ready == 0 || V_ipfw_nat_ready == 0)
111 return;
112
113 chain = &V_layer3_chain;
114 IPFW_UH_WLOCK(chain);
115 /* Check every nat entry... */
116 LIST_FOREACH(ptr, &chain->nat, _next) {
117 struct epoch_tracker et;
118
119 /* ...using nic 'ifp->if_xname' as dynamic alias address. */
120 if (strncmp(ptr->if_name, ifp->if_xname, IF_NAMESIZE) != 0)
121 continue;
122 NET_EPOCH_ENTER(et);
123 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
124 if (ifa->ifa_addr == NULL)
125 continue;
126 if (ifa->ifa_addr->sa_family != AF_INET)
127 continue;
128 IPFW_WLOCK(chain);
129 ptr->ip = ((struct sockaddr_in *)
130 (ifa->ifa_addr))->sin_addr;
131 LibAliasSetAddress(ptr->lib, ptr->ip);
132 IPFW_WUNLOCK(chain);
133 }
134 NET_EPOCH_EXIT(et);
135 }
136 IPFW_UH_WUNLOCK(chain);
137 }
138
139 /*
140 * delete the pointers for nat entry ix, or all of them if ix < 0
141 */
142 static void
flush_nat_ptrs(struct ip_fw_chain * chain,const int ix)143 flush_nat_ptrs(struct ip_fw_chain *chain, const int ix)
144 {
145 ipfw_insn_nat *cmd;
146 int i;
147
148 IPFW_WLOCK_ASSERT(chain);
149 for (i = 0; i < chain->n_rules; i++) {
150 cmd = (ipfw_insn_nat *)ipfw_get_action(chain->map[i]);
151 if (cmd->o.opcode == O_NAT && cmd->nat != NULL &&
152 (ix < 0 || cmd->nat->id == ix))
153 cmd->nat = NULL;
154 }
155 }
156
157 static void
del_redir_spool_cfg(struct cfg_nat * n,struct redir_chain * head)158 del_redir_spool_cfg(struct cfg_nat *n, struct redir_chain *head)
159 {
160 struct cfg_redir *r, *tmp_r;
161 struct cfg_spool *s, *tmp_s;
162 int i, num;
163
164 LIST_FOREACH_SAFE(r, head, _next, tmp_r) {
165 num = 1; /* Number of alias_link to delete. */
166 switch (r->mode) {
167 case NAT44_REDIR_PORT:
168 num = r->pport_cnt;
169 /* FALLTHROUGH */
170 case NAT44_REDIR_ADDR:
171 case NAT44_REDIR_PROTO:
172 /* Delete all libalias redirect entry. */
173 for (i = 0; i < num; i++)
174 LibAliasRedirectDelete(n->lib, r->alink[i]);
175 /* Del spool cfg if any. */
176 LIST_FOREACH_SAFE(s, &r->spool_chain, _next, tmp_s) {
177 LIST_REMOVE(s, _next);
178 free(s, M_IPFW);
179 }
180 free(r->alink, M_IPFW);
181 LIST_REMOVE(r, _next);
182 free(r, M_IPFW);
183 break;
184 default:
185 printf("unknown redirect mode: %u\n", r->mode);
186 /* XXX - panic?!?!? */
187 break;
188 }
189 }
190 }
191
192 static int
add_redir_spool_cfg(char * buf,struct cfg_nat * ptr)193 add_redir_spool_cfg(char *buf, struct cfg_nat *ptr)
194 {
195 struct cfg_redir *r;
196 struct cfg_spool *s;
197 struct nat44_cfg_redir *ser_r;
198 struct nat44_cfg_spool *ser_s;
199
200 int cnt, off, i;
201
202 for (cnt = 0, off = 0; cnt < ptr->redir_cnt; cnt++) {
203 ser_r = (struct nat44_cfg_redir *)&buf[off];
204 r = malloc(sizeof(*r), M_IPFW, M_WAITOK | M_ZERO);
205 r->mode = ser_r->mode;
206 r->laddr = ser_r->laddr;
207 r->paddr = ser_r->paddr;
208 r->raddr = ser_r->raddr;
209 r->lport = ser_r->lport;
210 r->pport = ser_r->pport;
211 r->rport = ser_r->rport;
212 r->pport_cnt = ser_r->pport_cnt;
213 r->rport_cnt = ser_r->rport_cnt;
214 r->proto = ser_r->proto;
215 r->spool_cnt = ser_r->spool_cnt;
216 //memcpy(r, ser_r, SOF_REDIR);
217 LIST_INIT(&r->spool_chain);
218 off += sizeof(struct nat44_cfg_redir);
219 r->alink = malloc(sizeof(struct alias_link *) * r->pport_cnt,
220 M_IPFW, M_WAITOK | M_ZERO);
221 switch (r->mode) {
222 case NAT44_REDIR_ADDR:
223 r->alink[0] = LibAliasRedirectAddr(ptr->lib, r->laddr,
224 r->paddr);
225 break;
226 case NAT44_REDIR_PORT:
227 for (i = 0 ; i < r->pport_cnt; i++) {
228 /* If remotePort is all ports, set it to 0. */
229 u_short remotePortCopy = r->rport + i;
230 if (r->rport_cnt == 1 && r->rport == 0)
231 remotePortCopy = 0;
232 r->alink[i] = LibAliasRedirectPort(ptr->lib,
233 r->laddr, htons(r->lport + i), r->raddr,
234 htons(remotePortCopy), r->paddr,
235 htons(r->pport + i), r->proto);
236 if (r->alink[i] == NULL) {
237 r->alink[0] = NULL;
238 break;
239 }
240 }
241 break;
242 case NAT44_REDIR_PROTO:
243 r->alink[0] = LibAliasRedirectProto(ptr->lib ,r->laddr,
244 r->raddr, r->paddr, r->proto);
245 break;
246 default:
247 printf("unknown redirect mode: %u\n", r->mode);
248 break;
249 }
250 if (r->alink[0] == NULL) {
251 printf("LibAliasRedirect* returned NULL\n");
252 free(r->alink, M_IPFW);
253 free(r, M_IPFW);
254 return (EINVAL);
255 }
256 /* LSNAT handling. */
257 for (i = 0; i < r->spool_cnt; i++) {
258 ser_s = (struct nat44_cfg_spool *)&buf[off];
259 s = malloc(sizeof(*s), M_IPFW, M_WAITOK | M_ZERO);
260 s->addr = ser_s->addr;
261 s->port = ser_s->port;
262 LibAliasAddServer(ptr->lib, r->alink[0],
263 s->addr, htons(s->port));
264 off += sizeof(struct nat44_cfg_spool);
265 /* Hook spool entry. */
266 LIST_INSERT_HEAD(&r->spool_chain, s, _next);
267 }
268 /* And finally hook this redir entry. */
269 LIST_INSERT_HEAD(&ptr->redir_chain, r, _next);
270 }
271
272 return (0);
273 }
274
275 static void
free_nat_instance(struct cfg_nat * ptr)276 free_nat_instance(struct cfg_nat *ptr)
277 {
278
279 del_redir_spool_cfg(ptr, &ptr->redir_chain);
280 LibAliasUninit(ptr->lib);
281 free(ptr, M_IPFW);
282 }
283
284 /*
285 * ipfw_nat - perform mbuf header translation.
286 *
287 * Note V_layer3_chain has to be locked while calling ipfw_nat() in
288 * 'global' operation mode (t == NULL).
289 *
290 */
291 static int
ipfw_nat(struct ip_fw_args * args,struct cfg_nat * t,struct mbuf * m)292 ipfw_nat(struct ip_fw_args *args, struct cfg_nat *t, struct mbuf *m)
293 {
294 struct mbuf *mcl;
295 struct ip *ip;
296 /* XXX - libalias duct tape */
297 int ldt, retval, found;
298 struct ip_fw_chain *chain;
299 char *c;
300
301 ldt = 0;
302 retval = 0;
303 mcl = m_megapullup(m, m->m_pkthdr.len);
304 if (mcl == NULL) {
305 args->m = NULL;
306 return (IP_FW_DENY);
307 }
308 ip = mtod(mcl, struct ip *);
309
310 /*
311 * XXX - Libalias checksum offload 'duct tape':
312 *
313 * locally generated packets have only pseudo-header checksum
314 * calculated and libalias will break it[1], so mark them for
315 * later fix. Moreover there are cases when libalias modifies
316 * tcp packet data[2], mark them for later fix too.
317 *
318 * [1] libalias was never meant to run in kernel, so it does
319 * not have any knowledge about checksum offloading, and
320 * expects a packet with a full internet checksum.
321 * Unfortunately, packets generated locally will have just the
322 * pseudo header calculated, and when libalias tries to adjust
323 * the checksum it will actually compute a wrong value.
324 *
325 * [2] when libalias modifies tcp's data content, full TCP
326 * checksum has to be recomputed: the problem is that
327 * libalias does not have any idea about checksum offloading.
328 * To work around this, we do not do checksumming in LibAlias,
329 * but only mark the packets in th_x2 field. If we receive a
330 * marked packet, we calculate correct checksum for it
331 * aware of offloading. Why such a terrible hack instead of
332 * recalculating checksum for each packet?
333 * Because the previous checksum was not checked!
334 * Recalculating checksums for EVERY packet will hide ALL
335 * transmission errors. Yes, marked packets still suffer from
336 * this problem. But, sigh, natd(8) has this problem, too.
337 *
338 * TODO: -make libalias mbuf aware (so
339 * it can handle delayed checksum and tso)
340 */
341
342 if (mcl->m_pkthdr.rcvif == NULL &&
343 mcl->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
344 ldt = 1;
345
346 c = mtod(mcl, char *);
347
348 /* Check if this is 'global' instance */
349 if (t == NULL) {
350 if (args->flags & IPFW_ARGS_IN) {
351 /* Wrong direction, skip processing */
352 args->m = mcl;
353 return (IP_FW_NAT);
354 }
355
356 found = 0;
357 chain = &V_layer3_chain;
358 IPFW_RLOCK_ASSERT(chain);
359 /* Check every nat entry... */
360 LIST_FOREACH(t, &chain->nat, _next) {
361 if ((t->mode & PKT_ALIAS_SKIP_GLOBAL) != 0)
362 continue;
363 retval = LibAliasOutTry(t->lib, c,
364 mcl->m_len + M_TRAILINGSPACE(mcl), 0);
365 if (retval == PKT_ALIAS_OK) {
366 /* Nat instance recognises state */
367 found = 1;
368 break;
369 }
370 }
371 if (found != 1) {
372 /* No instance found, return ignore */
373 args->m = mcl;
374 return (IP_FW_NAT);
375 }
376 } else {
377 if (args->flags & IPFW_ARGS_IN)
378 retval = LibAliasIn(t->lib, c,
379 mcl->m_len + M_TRAILINGSPACE(mcl));
380 else
381 retval = LibAliasOut(t->lib, c,
382 mcl->m_len + M_TRAILINGSPACE(mcl));
383 }
384
385 /*
386 * We drop packet when:
387 * 1. libalias returns PKT_ALIAS_ERROR;
388 * 2. For incoming packets:
389 * a) for unresolved fragments;
390 * b) libalias returns PKT_ALIAS_IGNORED and
391 * PKT_ALIAS_DENY_INCOMING flag is set.
392 */
393 if (retval == PKT_ALIAS_ERROR ||
394 ((args->flags & IPFW_ARGS_IN) &&
395 (retval == PKT_ALIAS_UNRESOLVED_FRAGMENT ||
396 (retval == PKT_ALIAS_IGNORED &&
397 (t->mode & PKT_ALIAS_DENY_INCOMING) != 0)))) {
398 /* XXX - should i add some logging? */
399 m_free(mcl);
400 args->m = NULL;
401 return (IP_FW_DENY);
402 }
403
404 if (retval == PKT_ALIAS_RESPOND)
405 mcl->m_flags |= M_SKIP_FIREWALL;
406 mcl->m_pkthdr.len = mcl->m_len = ntohs(ip->ip_len);
407
408 /*
409 * XXX - libalias checksum offload
410 * 'duct tape' (see above)
411 */
412
413 if ((ip->ip_off & htons(IP_OFFMASK)) == 0 &&
414 ip->ip_p == IPPROTO_TCP) {
415 struct tcphdr *th;
416
417 th = (struct tcphdr *)(ip + 1);
418 if (th->th_x2)
419 ldt = 1;
420 }
421
422 if (ldt) {
423 struct tcphdr *th;
424 struct udphdr *uh;
425 uint16_t ip_len, cksum;
426
427 ip_len = ntohs(ip->ip_len);
428 cksum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
429 htons(ip->ip_p + ip_len - (ip->ip_hl << 2)));
430
431 switch (ip->ip_p) {
432 case IPPROTO_TCP:
433 th = (struct tcphdr *)(ip + 1);
434 /*
435 * Maybe it was set in
436 * libalias...
437 */
438 th->th_x2 = 0;
439 th->th_sum = cksum;
440 mcl->m_pkthdr.csum_data =
441 offsetof(struct tcphdr, th_sum);
442 break;
443 case IPPROTO_UDP:
444 uh = (struct udphdr *)(ip + 1);
445 uh->uh_sum = cksum;
446 mcl->m_pkthdr.csum_data =
447 offsetof(struct udphdr, uh_sum);
448 break;
449 }
450 /* No hw checksum offloading: do it ourselves */
451 if ((mcl->m_pkthdr.csum_flags & CSUM_DELAY_DATA) == 0) {
452 in_delayed_cksum(mcl);
453 mcl->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
454 }
455 }
456 args->m = mcl;
457 return (IP_FW_NAT);
458 }
459
460 static struct cfg_nat *
lookup_nat(struct nat_list * l,int nat_id)461 lookup_nat(struct nat_list *l, int nat_id)
462 {
463 struct cfg_nat *res;
464
465 LIST_FOREACH(res, l, _next) {
466 if (res->id == nat_id)
467 break;
468 }
469 return res;
470 }
471
472 static struct cfg_nat *
lookup_nat_name(struct nat_list * l,char * name)473 lookup_nat_name(struct nat_list *l, char *name)
474 {
475 struct cfg_nat *res;
476 int id;
477 char *errptr;
478
479 id = strtol(name, &errptr, 10);
480 if (id == 0 || *errptr != '\0')
481 return (NULL);
482
483 LIST_FOREACH(res, l, _next) {
484 if (res->id == id)
485 break;
486 }
487 return (res);
488 }
489
490 /* IP_FW3 configuration routines */
491
492 static void
nat44_config(struct ip_fw_chain * chain,struct nat44_cfg_nat * ucfg)493 nat44_config(struct ip_fw_chain *chain, struct nat44_cfg_nat *ucfg)
494 {
495 struct cfg_nat *ptr, *tcfg;
496 int gencnt;
497
498 /*
499 * Find/create nat rule.
500 */
501 IPFW_UH_WLOCK(chain);
502 gencnt = chain->gencnt;
503 ptr = lookup_nat_name(&chain->nat, ucfg->name);
504 if (ptr == NULL) {
505 IPFW_UH_WUNLOCK(chain);
506 /* New rule: allocate and init new instance. */
507 ptr = malloc(sizeof(struct cfg_nat), M_IPFW, M_WAITOK | M_ZERO);
508 ptr->lib = LibAliasInit(NULL);
509 LIST_INIT(&ptr->redir_chain);
510 } else {
511 /* Entry already present: temporarily unhook it. */
512 IPFW_WLOCK(chain);
513 LIST_REMOVE(ptr, _next);
514 flush_nat_ptrs(chain, ptr->id);
515 IPFW_WUNLOCK(chain);
516 IPFW_UH_WUNLOCK(chain);
517 }
518
519 /*
520 * Basic nat (re)configuration.
521 */
522 ptr->id = strtol(ucfg->name, NULL, 10);
523 /*
524 * XXX - what if this rule doesn't nat any ip and just
525 * redirect?
526 * do we set aliasaddress to 0.0.0.0?
527 */
528 ptr->ip = ucfg->ip;
529 ptr->redir_cnt = ucfg->redir_cnt;
530 ptr->mode = ucfg->mode;
531 strlcpy(ptr->if_name, ucfg->if_name, sizeof(ptr->if_name));
532 LibAliasSetMode(ptr->lib, ptr->mode, ~0);
533 LibAliasSetAddress(ptr->lib, ptr->ip);
534
535 /*
536 * Redir and LSNAT configuration.
537 */
538 /* Delete old cfgs. */
539 del_redir_spool_cfg(ptr, &ptr->redir_chain);
540 /* Add new entries. */
541 add_redir_spool_cfg((char *)(ucfg + 1), ptr);
542 IPFW_UH_WLOCK(chain);
543
544 /* Extra check to avoid race with another ipfw_nat_cfg() */
545 tcfg = NULL;
546 if (gencnt != chain->gencnt)
547 tcfg = lookup_nat_name(&chain->nat, ucfg->name);
548 IPFW_WLOCK(chain);
549 if (tcfg != NULL)
550 LIST_REMOVE(tcfg, _next);
551 LIST_INSERT_HEAD(&chain->nat, ptr, _next);
552 IPFW_WUNLOCK(chain);
553 chain->gencnt++;
554
555 IPFW_UH_WUNLOCK(chain);
556
557 if (tcfg != NULL)
558 free_nat_instance(ptr);
559 }
560
561 /*
562 * Creates/configure nat44 instance
563 * Data layout (v0)(current):
564 * Request: [ ipfw_obj_header nat44_cfg_nat .. ]
565 *
566 * Returns 0 on success
567 */
568 static int
nat44_cfg(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)569 nat44_cfg(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
570 struct sockopt_data *sd)
571 {
572 ipfw_obj_header *oh;
573 struct nat44_cfg_nat *ucfg;
574 int id;
575 size_t read;
576 char *errptr;
577
578 /* Check minimum header size */
579 if (sd->valsize < (sizeof(*oh) + sizeof(*ucfg)))
580 return (EINVAL);
581
582 oh = (ipfw_obj_header *)sd->kbuf;
583
584 /* Basic length checks for TLVs */
585 if (oh->ntlv.head.length != sizeof(oh->ntlv))
586 return (EINVAL);
587
588 ucfg = (struct nat44_cfg_nat *)(oh + 1);
589
590 /* Check if name is properly terminated and looks like number */
591 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
592 return (EINVAL);
593 id = strtol(ucfg->name, &errptr, 10);
594 if (id == 0 || *errptr != '\0')
595 return (EINVAL);
596
597 read = sizeof(*oh) + sizeof(*ucfg);
598 /* Check number of redirs */
599 if (sd->valsize < read + ucfg->redir_cnt*sizeof(struct nat44_cfg_redir))
600 return (EINVAL);
601
602 nat44_config(chain, ucfg);
603 return (0);
604 }
605
606 /*
607 * Destroys given nat instances.
608 * Data layout (v0)(current):
609 * Request: [ ipfw_obj_header ]
610 *
611 * Returns 0 on success
612 */
613 static int
nat44_destroy(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)614 nat44_destroy(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
615 struct sockopt_data *sd)
616 {
617 ipfw_obj_header *oh;
618 struct cfg_nat *ptr;
619 ipfw_obj_ntlv *ntlv;
620
621 /* Check minimum header size */
622 if (sd->valsize < sizeof(*oh))
623 return (EINVAL);
624
625 oh = (ipfw_obj_header *)sd->kbuf;
626
627 /* Basic length checks for TLVs */
628 if (oh->ntlv.head.length != sizeof(oh->ntlv))
629 return (EINVAL);
630
631 ntlv = &oh->ntlv;
632 /* Check if name is properly terminated */
633 if (strnlen(ntlv->name, sizeof(ntlv->name)) == sizeof(ntlv->name))
634 return (EINVAL);
635
636 IPFW_UH_WLOCK(chain);
637 ptr = lookup_nat_name(&chain->nat, ntlv->name);
638 if (ptr == NULL) {
639 IPFW_UH_WUNLOCK(chain);
640 return (ESRCH);
641 }
642 IPFW_WLOCK(chain);
643 LIST_REMOVE(ptr, _next);
644 flush_nat_ptrs(chain, ptr->id);
645 IPFW_WUNLOCK(chain);
646 IPFW_UH_WUNLOCK(chain);
647
648 free_nat_instance(ptr);
649
650 return (0);
651 }
652
653 static void
export_nat_cfg(struct cfg_nat * ptr,struct nat44_cfg_nat * ucfg)654 export_nat_cfg(struct cfg_nat *ptr, struct nat44_cfg_nat *ucfg)
655 {
656
657 snprintf(ucfg->name, sizeof(ucfg->name), "%d", ptr->id);
658 ucfg->ip = ptr->ip;
659 ucfg->redir_cnt = ptr->redir_cnt;
660 ucfg->mode = ptr->mode;
661 strlcpy(ucfg->if_name, ptr->if_name, sizeof(ucfg->if_name));
662 }
663
664 /*
665 * Gets config for given nat instance
666 * Data layout (v0)(current):
667 * Request: [ ipfw_obj_header nat44_cfg_nat .. ]
668 *
669 * Returns 0 on success
670 */
671 static int
nat44_get_cfg(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)672 nat44_get_cfg(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
673 struct sockopt_data *sd)
674 {
675 ipfw_obj_header *oh;
676 struct nat44_cfg_nat *ucfg;
677 struct cfg_nat *ptr;
678 struct cfg_redir *r;
679 struct cfg_spool *s;
680 struct nat44_cfg_redir *ser_r;
681 struct nat44_cfg_spool *ser_s;
682 size_t sz;
683
684 sz = sizeof(*oh) + sizeof(*ucfg);
685 /* Check minimum header size */
686 if (sd->valsize < sz)
687 return (EINVAL);
688
689 oh = (struct _ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
690
691 /* Basic length checks for TLVs */
692 if (oh->ntlv.head.length != sizeof(oh->ntlv))
693 return (EINVAL);
694
695 ucfg = (struct nat44_cfg_nat *)(oh + 1);
696
697 /* Check if name is properly terminated */
698 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
699 return (EINVAL);
700
701 IPFW_UH_RLOCK(chain);
702 ptr = lookup_nat_name(&chain->nat, ucfg->name);
703 if (ptr == NULL) {
704 IPFW_UH_RUNLOCK(chain);
705 return (ESRCH);
706 }
707
708 export_nat_cfg(ptr, ucfg);
709
710 /* Estimate memory amount */
711 sz = sizeof(ipfw_obj_header) + sizeof(struct nat44_cfg_nat);
712 LIST_FOREACH(r, &ptr->redir_chain, _next) {
713 sz += sizeof(struct nat44_cfg_redir);
714 LIST_FOREACH(s, &r->spool_chain, _next)
715 sz += sizeof(struct nat44_cfg_spool);
716 }
717
718 ucfg->size = sz;
719 if (sd->valsize < sz) {
720 /*
721 * Submitted buffer size is not enough.
722 * WE've already filled in @ucfg structure with
723 * relevant info including size, so we
724 * can return. Buffer will be flushed automatically.
725 */
726 IPFW_UH_RUNLOCK(chain);
727 return (ENOMEM);
728 }
729
730 /* Size OK, let's copy data */
731 LIST_FOREACH(r, &ptr->redir_chain, _next) {
732 ser_r = (struct nat44_cfg_redir *)ipfw_get_sopt_space(sd,
733 sizeof(*ser_r));
734 ser_r->mode = r->mode;
735 ser_r->laddr = r->laddr;
736 ser_r->paddr = r->paddr;
737 ser_r->raddr = r->raddr;
738 ser_r->lport = r->lport;
739 ser_r->pport = r->pport;
740 ser_r->rport = r->rport;
741 ser_r->pport_cnt = r->pport_cnt;
742 ser_r->rport_cnt = r->rport_cnt;
743 ser_r->proto = r->proto;
744 ser_r->spool_cnt = r->spool_cnt;
745
746 LIST_FOREACH(s, &r->spool_chain, _next) {
747 ser_s = (struct nat44_cfg_spool *)ipfw_get_sopt_space(
748 sd, sizeof(*ser_s));
749
750 ser_s->addr = s->addr;
751 ser_s->port = s->port;
752 }
753 }
754
755 IPFW_UH_RUNLOCK(chain);
756
757 return (0);
758 }
759
760 /*
761 * Lists all nat44 instances currently available in kernel.
762 * Data layout (v0)(current):
763 * Request: [ ipfw_obj_lheader ]
764 * Reply: [ ipfw_obj_lheader nat44_cfg_nat x N ]
765 *
766 * Returns 0 on success
767 */
768 static int
nat44_list_nat(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)769 nat44_list_nat(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
770 struct sockopt_data *sd)
771 {
772 ipfw_obj_lheader *olh;
773 struct nat44_cfg_nat *ucfg;
774 struct cfg_nat *ptr;
775 int nat_count;
776
777 /* Check minimum header size */
778 if (sd->valsize < sizeof(ipfw_obj_lheader))
779 return (EINVAL);
780
781 olh = (ipfw_obj_lheader *)ipfw_get_sopt_header(sd, sizeof(*olh));
782 IPFW_UH_RLOCK(chain);
783 nat_count = 0;
784 LIST_FOREACH(ptr, &chain->nat, _next)
785 nat_count++;
786
787 olh->count = nat_count;
788 olh->objsize = sizeof(struct nat44_cfg_nat);
789 olh->size = sizeof(*olh) + olh->count * olh->objsize;
790
791 if (sd->valsize < olh->size) {
792 IPFW_UH_RUNLOCK(chain);
793 return (ENOMEM);
794 }
795
796 LIST_FOREACH(ptr, &chain->nat, _next) {
797 ucfg = (struct nat44_cfg_nat *)ipfw_get_sopt_space(sd,
798 sizeof(*ucfg));
799 export_nat_cfg(ptr, ucfg);
800 }
801
802 IPFW_UH_RUNLOCK(chain);
803
804 return (0);
805 }
806
807 /*
808 * Gets log for given nat instance
809 * Data layout (v0)(current):
810 * Request: [ ipfw_obj_header nat44_cfg_nat ]
811 * Reply: [ ipfw_obj_header nat44_cfg_nat LOGBUFFER ]
812 *
813 * Returns 0 on success
814 */
815 static int
nat44_get_log(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)816 nat44_get_log(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
817 struct sockopt_data *sd)
818 {
819 ipfw_obj_header *oh;
820 struct nat44_cfg_nat *ucfg;
821 struct cfg_nat *ptr;
822 void *pbuf;
823 size_t sz;
824
825 sz = sizeof(*oh) + sizeof(*ucfg);
826 /* Check minimum header size */
827 if (sd->valsize < sz)
828 return (EINVAL);
829
830 oh = (struct _ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
831
832 /* Basic length checks for TLVs */
833 if (oh->ntlv.head.length != sizeof(oh->ntlv))
834 return (EINVAL);
835
836 ucfg = (struct nat44_cfg_nat *)(oh + 1);
837
838 /* Check if name is properly terminated */
839 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
840 return (EINVAL);
841
842 IPFW_UH_RLOCK(chain);
843 ptr = lookup_nat_name(&chain->nat, ucfg->name);
844 if (ptr == NULL) {
845 IPFW_UH_RUNLOCK(chain);
846 return (ESRCH);
847 }
848
849 if (ptr->lib->logDesc == NULL) {
850 IPFW_UH_RUNLOCK(chain);
851 return (ENOENT);
852 }
853
854 export_nat_cfg(ptr, ucfg);
855
856 /* Estimate memory amount */
857 ucfg->size = sizeof(struct nat44_cfg_nat) + LIBALIAS_BUF_SIZE;
858 if (sd->valsize < sz + sizeof(*oh)) {
859 /*
860 * Submitted buffer size is not enough.
861 * WE've already filled in @ucfg structure with
862 * relevant info including size, so we
863 * can return. Buffer will be flushed automatically.
864 */
865 IPFW_UH_RUNLOCK(chain);
866 return (ENOMEM);
867 }
868
869 pbuf = (void *)ipfw_get_sopt_space(sd, LIBALIAS_BUF_SIZE);
870 memcpy(pbuf, ptr->lib->logDesc, LIBALIAS_BUF_SIZE);
871
872 IPFW_UH_RUNLOCK(chain);
873
874 return (0);
875 }
876
877 static struct ipfw_sopt_handler scodes[] = {
878 { IP_FW_NAT44_XCONFIG, 0, HDIR_SET, nat44_cfg },
879 { IP_FW_NAT44_DESTROY, 0, HDIR_SET, nat44_destroy },
880 { IP_FW_NAT44_XGETCONFIG, 0, HDIR_GET, nat44_get_cfg },
881 { IP_FW_NAT44_LIST_NAT, 0, HDIR_GET, nat44_list_nat },
882 { IP_FW_NAT44_XGETLOG, 0, HDIR_GET, nat44_get_log },
883 };
884
885 /*
886 * Legacy configuration routines
887 */
888
889 struct cfg_spool_legacy {
890 LIST_ENTRY(cfg_spool_legacy) _next;
891 struct in_addr addr;
892 u_short port;
893 };
894
895 struct cfg_redir_legacy {
896 LIST_ENTRY(cfg_redir) _next;
897 u_int16_t mode;
898 struct in_addr laddr;
899 struct in_addr paddr;
900 struct in_addr raddr;
901 u_short lport;
902 u_short pport;
903 u_short rport;
904 u_short pport_cnt;
905 u_short rport_cnt;
906 int proto;
907 struct alias_link **alink;
908 u_int16_t spool_cnt;
909 LIST_HEAD(, cfg_spool_legacy) spool_chain;
910 };
911
912 struct cfg_nat_legacy {
913 LIST_ENTRY(cfg_nat_legacy) _next;
914 int id;
915 struct in_addr ip;
916 char if_name[IF_NAMESIZE];
917 int mode;
918 struct libalias *lib;
919 int redir_cnt;
920 LIST_HEAD(, cfg_redir_legacy) redir_chain;
921 };
922
923 static int
ipfw_nat_cfg(struct sockopt * sopt)924 ipfw_nat_cfg(struct sockopt *sopt)
925 {
926 struct cfg_nat_legacy *cfg;
927 struct nat44_cfg_nat *ucfg;
928 struct cfg_redir_legacy *rdir;
929 struct nat44_cfg_redir *urdir;
930 char *buf;
931 size_t len, len2;
932 int error, i;
933
934 len = sopt->sopt_valsize;
935 len2 = len + 128;
936
937 /*
938 * Allocate 2x buffer to store converted structures.
939 * new redir_cfg has shrunk, so we're sure that
940 * new buffer size is enough.
941 */
942 buf = malloc(roundup2(len, 8) + len2, M_TEMP, M_WAITOK | M_ZERO);
943 error = sooptcopyin(sopt, buf, len, sizeof(struct cfg_nat_legacy));
944 if (error != 0)
945 goto out;
946
947 cfg = (struct cfg_nat_legacy *)buf;
948 if (cfg->id < 0) {
949 error = EINVAL;
950 goto out;
951 }
952
953 ucfg = (struct nat44_cfg_nat *)&buf[roundup2(len, 8)];
954 snprintf(ucfg->name, sizeof(ucfg->name), "%d", cfg->id);
955 strlcpy(ucfg->if_name, cfg->if_name, sizeof(ucfg->if_name));
956 ucfg->ip = cfg->ip;
957 ucfg->mode = cfg->mode;
958 ucfg->redir_cnt = cfg->redir_cnt;
959
960 if (len < sizeof(*cfg) + cfg->redir_cnt * sizeof(*rdir)) {
961 error = EINVAL;
962 goto out;
963 }
964
965 urdir = (struct nat44_cfg_redir *)(ucfg + 1);
966 rdir = (struct cfg_redir_legacy *)(cfg + 1);
967 for (i = 0; i < cfg->redir_cnt; i++) {
968 urdir->mode = rdir->mode;
969 urdir->laddr = rdir->laddr;
970 urdir->paddr = rdir->paddr;
971 urdir->raddr = rdir->raddr;
972 urdir->lport = rdir->lport;
973 urdir->pport = rdir->pport;
974 urdir->rport = rdir->rport;
975 urdir->pport_cnt = rdir->pport_cnt;
976 urdir->rport_cnt = rdir->rport_cnt;
977 urdir->proto = rdir->proto;
978 urdir->spool_cnt = rdir->spool_cnt;
979
980 urdir++;
981 rdir++;
982 }
983
984 nat44_config(&V_layer3_chain, ucfg);
985
986 out:
987 free(buf, M_TEMP);
988 return (error);
989 }
990
991 static int
ipfw_nat_del(struct sockopt * sopt)992 ipfw_nat_del(struct sockopt *sopt)
993 {
994 struct cfg_nat *ptr;
995 struct ip_fw_chain *chain = &V_layer3_chain;
996 int i;
997
998 sooptcopyin(sopt, &i, sizeof i, sizeof i);
999 /* XXX validate i */
1000 IPFW_UH_WLOCK(chain);
1001 ptr = lookup_nat(&chain->nat, i);
1002 if (ptr == NULL) {
1003 IPFW_UH_WUNLOCK(chain);
1004 return (EINVAL);
1005 }
1006 IPFW_WLOCK(chain);
1007 LIST_REMOVE(ptr, _next);
1008 flush_nat_ptrs(chain, i);
1009 IPFW_WUNLOCK(chain);
1010 IPFW_UH_WUNLOCK(chain);
1011 free_nat_instance(ptr);
1012 return (0);
1013 }
1014
1015 static int
ipfw_nat_get_cfg(struct sockopt * sopt)1016 ipfw_nat_get_cfg(struct sockopt *sopt)
1017 {
1018 struct ip_fw_chain *chain = &V_layer3_chain;
1019 struct cfg_nat *n;
1020 struct cfg_nat_legacy *ucfg;
1021 struct cfg_redir *r;
1022 struct cfg_spool *s;
1023 struct cfg_redir_legacy *ser_r;
1024 struct cfg_spool_legacy *ser_s;
1025 char *data;
1026 int gencnt, nat_cnt, len, error;
1027
1028 nat_cnt = 0;
1029 len = sizeof(nat_cnt);
1030
1031 IPFW_UH_RLOCK(chain);
1032 retry:
1033 gencnt = chain->gencnt;
1034 /* Estimate memory amount */
1035 LIST_FOREACH(n, &chain->nat, _next) {
1036 nat_cnt++;
1037 len += sizeof(struct cfg_nat_legacy);
1038 LIST_FOREACH(r, &n->redir_chain, _next) {
1039 len += sizeof(struct cfg_redir_legacy);
1040 LIST_FOREACH(s, &r->spool_chain, _next)
1041 len += sizeof(struct cfg_spool_legacy);
1042 }
1043 }
1044 IPFW_UH_RUNLOCK(chain);
1045
1046 data = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
1047 bcopy(&nat_cnt, data, sizeof(nat_cnt));
1048
1049 nat_cnt = 0;
1050 len = sizeof(nat_cnt);
1051
1052 IPFW_UH_RLOCK(chain);
1053 if (gencnt != chain->gencnt) {
1054 free(data, M_TEMP);
1055 goto retry;
1056 }
1057 /* Serialize all the data. */
1058 LIST_FOREACH(n, &chain->nat, _next) {
1059 ucfg = (struct cfg_nat_legacy *)&data[len];
1060 ucfg->id = n->id;
1061 ucfg->ip = n->ip;
1062 ucfg->redir_cnt = n->redir_cnt;
1063 ucfg->mode = n->mode;
1064 strlcpy(ucfg->if_name, n->if_name, sizeof(ucfg->if_name));
1065 len += sizeof(struct cfg_nat_legacy);
1066 LIST_FOREACH(r, &n->redir_chain, _next) {
1067 ser_r = (struct cfg_redir_legacy *)&data[len];
1068 ser_r->mode = r->mode;
1069 ser_r->laddr = r->laddr;
1070 ser_r->paddr = r->paddr;
1071 ser_r->raddr = r->raddr;
1072 ser_r->lport = r->lport;
1073 ser_r->pport = r->pport;
1074 ser_r->rport = r->rport;
1075 ser_r->pport_cnt = r->pport_cnt;
1076 ser_r->rport_cnt = r->rport_cnt;
1077 ser_r->proto = r->proto;
1078 ser_r->spool_cnt = r->spool_cnt;
1079 len += sizeof(struct cfg_redir_legacy);
1080 LIST_FOREACH(s, &r->spool_chain, _next) {
1081 ser_s = (struct cfg_spool_legacy *)&data[len];
1082 ser_s->addr = s->addr;
1083 ser_s->port = s->port;
1084 len += sizeof(struct cfg_spool_legacy);
1085 }
1086 }
1087 }
1088 IPFW_UH_RUNLOCK(chain);
1089
1090 error = sooptcopyout(sopt, data, len);
1091 free(data, M_TEMP);
1092
1093 return (error);
1094 }
1095
1096 static int
ipfw_nat_get_log(struct sockopt * sopt)1097 ipfw_nat_get_log(struct sockopt *sopt)
1098 {
1099 uint8_t *data;
1100 struct cfg_nat *ptr;
1101 int i, size;
1102 struct ip_fw_chain *chain;
1103 IPFW_RLOCK_TRACKER;
1104
1105 chain = &V_layer3_chain;
1106
1107 IPFW_RLOCK(chain);
1108 /* one pass to count, one to copy the data */
1109 i = 0;
1110 LIST_FOREACH(ptr, &chain->nat, _next) {
1111 if (ptr->lib->logDesc == NULL)
1112 continue;
1113 i++;
1114 }
1115 size = i * (LIBALIAS_BUF_SIZE + sizeof(int));
1116 data = malloc(size, M_IPFW, M_NOWAIT | M_ZERO);
1117 if (data == NULL) {
1118 IPFW_RUNLOCK(chain);
1119 return (ENOSPC);
1120 }
1121 i = 0;
1122 LIST_FOREACH(ptr, &chain->nat, _next) {
1123 if (ptr->lib->logDesc == NULL)
1124 continue;
1125 bcopy(&ptr->id, &data[i], sizeof(int));
1126 i += sizeof(int);
1127 bcopy(ptr->lib->logDesc, &data[i], LIBALIAS_BUF_SIZE);
1128 i += LIBALIAS_BUF_SIZE;
1129 }
1130 IPFW_RUNLOCK(chain);
1131 sooptcopyout(sopt, data, size);
1132 free(data, M_IPFW);
1133 return(0);
1134 }
1135
1136 static int
vnet_ipfw_nat_init(const void * arg __unused)1137 vnet_ipfw_nat_init(const void *arg __unused)
1138 {
1139
1140 V_ipfw_nat_ready = 1;
1141 return (0);
1142 }
1143
1144 static int
vnet_ipfw_nat_uninit(const void * arg __unused)1145 vnet_ipfw_nat_uninit(const void *arg __unused)
1146 {
1147 struct cfg_nat *ptr, *ptr_temp;
1148 struct ip_fw_chain *chain;
1149
1150 chain = &V_layer3_chain;
1151 IPFW_WLOCK(chain);
1152 V_ipfw_nat_ready = 0;
1153 LIST_FOREACH_SAFE(ptr, &chain->nat, _next, ptr_temp) {
1154 LIST_REMOVE(ptr, _next);
1155 free_nat_instance(ptr);
1156 }
1157 flush_nat_ptrs(chain, -1 /* flush all */);
1158 IPFW_WUNLOCK(chain);
1159 return (0);
1160 }
1161
1162 static void
ipfw_nat_init(void)1163 ipfw_nat_init(void)
1164 {
1165
1166 /* init ipfw hooks */
1167 ipfw_nat_ptr = ipfw_nat;
1168 lookup_nat_ptr = lookup_nat;
1169 ipfw_nat_cfg_ptr = ipfw_nat_cfg;
1170 ipfw_nat_del_ptr = ipfw_nat_del;
1171 ipfw_nat_get_cfg_ptr = ipfw_nat_get_cfg;
1172 ipfw_nat_get_log_ptr = ipfw_nat_get_log;
1173 IPFW_ADD_SOPT_HANDLER(1, scodes);
1174
1175 ifaddr_event_tag = EVENTHANDLER_REGISTER(ifaddr_event, ifaddr_change,
1176 NULL, EVENTHANDLER_PRI_ANY);
1177 }
1178
1179 static void
ipfw_nat_destroy(void)1180 ipfw_nat_destroy(void)
1181 {
1182
1183 EVENTHANDLER_DEREGISTER(ifaddr_event, ifaddr_event_tag);
1184 /* deregister ipfw_nat */
1185 IPFW_DEL_SOPT_HANDLER(1, scodes);
1186 ipfw_nat_ptr = NULL;
1187 lookup_nat_ptr = NULL;
1188 ipfw_nat_cfg_ptr = NULL;
1189 ipfw_nat_del_ptr = NULL;
1190 ipfw_nat_get_cfg_ptr = NULL;
1191 ipfw_nat_get_log_ptr = NULL;
1192 }
1193
1194 static int
ipfw_nat_modevent(module_t mod,int type,void * unused)1195 ipfw_nat_modevent(module_t mod, int type, void *unused)
1196 {
1197 int err = 0;
1198
1199 switch (type) {
1200 case MOD_LOAD:
1201 break;
1202
1203 case MOD_UNLOAD:
1204 break;
1205
1206 default:
1207 return EOPNOTSUPP;
1208 break;
1209 }
1210 return err;
1211 }
1212
1213 static moduledata_t ipfw_nat_mod = {
1214 "ipfw_nat",
1215 ipfw_nat_modevent,
1216 0
1217 };
1218
1219 /* Define startup order. */
1220 #define IPFW_NAT_SI_SUB_FIREWALL SI_SUB_PROTO_FIREWALL
1221 #define IPFW_NAT_MODEVENT_ORDER (SI_ORDER_ANY - 128) /* after ipfw */
1222 #define IPFW_NAT_MODULE_ORDER (IPFW_NAT_MODEVENT_ORDER + 1)
1223 #define IPFW_NAT_VNET_ORDER (IPFW_NAT_MODEVENT_ORDER + 2)
1224
1225 DECLARE_MODULE(ipfw_nat, ipfw_nat_mod, IPFW_NAT_SI_SUB_FIREWALL, SI_ORDER_ANY);
1226 MODULE_DEPEND(ipfw_nat, libalias, 1, 1, 1);
1227 MODULE_DEPEND(ipfw_nat, ipfw, 3, 3, 3);
1228 MODULE_VERSION(ipfw_nat, 1);
1229
1230 SYSINIT(ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
1231 ipfw_nat_init, NULL);
1232 VNET_SYSINIT(vnet_ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_VNET_ORDER,
1233 vnet_ipfw_nat_init, NULL);
1234
1235 SYSUNINIT(ipfw_nat_destroy, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
1236 ipfw_nat_destroy, NULL);
1237 VNET_SYSUNINIT(vnet_ipfw_nat_uninit, IPFW_NAT_SI_SUB_FIREWALL,
1238 IPFW_NAT_VNET_ORDER, vnet_ipfw_nat_uninit, NULL);
1239
1240 /* end of file */
1241