1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
30 #include <sys/systm.h>
31 #include <sys/eventhandler.h>
32 #include <sys/malloc.h>
33 #include <sys/mbuf.h>
34 #include <sys/kernel.h>
35 #include <sys/lock.h>
36 #include <sys/module.h>
37 #include <sys/rwlock.h>
38 #include <sys/rmlock.h>
39
40 #include <netinet/libalias/alias.h>
41 #include <netinet/libalias/alias_local.h>
42
43 #include <net/if.h>
44 #include <net/if_var.h>
45 #include <net/if_private.h>
46 #include <netinet/in.h>
47 #include <netinet/ip.h>
48 #include <netinet/ip_var.h>
49 #include <netinet/ip_fw.h>
50 #include <netinet/tcp.h>
51 #include <netinet/udp.h>
52
53 #include <netpfil/ipfw/ip_fw_private.h>
54
55 #include <machine/in_cksum.h> /* XXX for in_cksum */
56
57 struct cfg_spool {
58 LIST_ENTRY(cfg_spool) _next; /* chain of spool instances */
59 struct in_addr addr;
60 uint16_t port;
61 };
62
63 /* Nat redirect configuration. */
64 struct cfg_redir {
65 LIST_ENTRY(cfg_redir) _next; /* chain of redir instances */
66 uint16_t mode; /* type of redirect mode */
67 uint16_t proto; /* protocol: tcp/udp */
68 struct in_addr laddr; /* local ip address */
69 struct in_addr paddr; /* public ip address */
70 struct in_addr raddr; /* remote ip address */
71 uint16_t lport; /* local port */
72 uint16_t pport; /* public port */
73 uint16_t rport; /* remote port */
74 uint16_t pport_cnt; /* number of public ports */
75 uint16_t rport_cnt; /* number of remote ports */
76 struct alias_link **alink;
77 u_int16_t spool_cnt; /* num of entry in spool chain */
78 /* chain of spool instances */
79 LIST_HEAD(spool_chain, cfg_spool) spool_chain;
80 };
81
82 /* Nat configuration data struct. */
83 struct cfg_nat {
84 /* chain of nat instances */
85 LIST_ENTRY(cfg_nat) _next;
86 int id; /* nat id */
87 struct in_addr ip; /* nat ip address */
88 struct libalias *lib; /* libalias instance */
89 int mode; /* aliasing mode */
90 int redir_cnt; /* number of entry in spool chain */
91 /* chain of redir instances */
92 LIST_HEAD(redir_chain, cfg_redir) redir_chain;
93 char if_name[IF_NAMESIZE]; /* interface name */
94 u_short alias_port_lo; /* low range for port aliasing */
95 u_short alias_port_hi; /* high range for port aliasing */
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 M_ASSERTMAPPED(mcl);
309 ip = mtod(mcl, struct ip *);
310
311 /*
312 * XXX - Libalias checksum offload 'duct tape':
313 *
314 * locally generated packets have only pseudo-header checksum
315 * calculated and libalias will break it[1], so mark them for
316 * later fix. Moreover there are cases when libalias modifies
317 * tcp packet data[2], mark them for later fix too.
318 *
319 * [1] libalias was never meant to run in kernel, so it does
320 * not have any knowledge about checksum offloading, and
321 * expects a packet with a full internet checksum.
322 * Unfortunately, packets generated locally will have just the
323 * pseudo header calculated, and when libalias tries to adjust
324 * the checksum it will actually compute a wrong value.
325 *
326 * [2] when libalias modifies tcp's data content, full TCP
327 * checksum has to be recomputed: the problem is that
328 * libalias does not have any idea about checksum offloading.
329 * To work around this, we do not do checksumming in LibAlias,
330 * but only mark the packets in th_x2 field. If we receive a
331 * marked packet, we calculate correct checksum for it
332 * aware of offloading. Why such a terrible hack instead of
333 * recalculating checksum for each packet?
334 * Because the previous checksum was not checked!
335 * Recalculating checksums for EVERY packet will hide ALL
336 * transmission errors. Yes, marked packets still suffer from
337 * this problem. But, sigh, natd(8) has this problem, too.
338 *
339 * TODO: -make libalias mbuf aware (so
340 * it can handle delayed checksum and tso)
341 */
342
343 if (mcl->m_pkthdr.rcvif == NULL &&
344 mcl->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
345 ldt = 1;
346
347 c = mtod(mcl, char *);
348
349 /* Check if this is 'global' instance */
350 if (t == NULL) {
351 if (args->flags & IPFW_ARGS_IN) {
352 /* Wrong direction, skip processing */
353 args->m = mcl;
354 return (IP_FW_NAT);
355 }
356
357 found = 0;
358 chain = &V_layer3_chain;
359 IPFW_RLOCK_ASSERT(chain);
360 /* Check every nat entry... */
361 LIST_FOREACH(t, &chain->nat, _next) {
362 if ((t->mode & PKT_ALIAS_SKIP_GLOBAL) != 0)
363 continue;
364 retval = LibAliasOutTry(t->lib, c,
365 mcl->m_len + M_TRAILINGSPACE(mcl), 0);
366 if (retval == PKT_ALIAS_OK) {
367 /* Nat instance recognises state */
368 found = 1;
369 break;
370 }
371 }
372 if (found != 1) {
373 /* No instance found, return ignore */
374 args->m = mcl;
375 return (IP_FW_NAT);
376 }
377 } else {
378 if (args->flags & IPFW_ARGS_IN)
379 retval = LibAliasIn(t->lib, c,
380 mcl->m_len + M_TRAILINGSPACE(mcl));
381 else
382 retval = LibAliasOut(t->lib, c,
383 mcl->m_len + M_TRAILINGSPACE(mcl));
384 }
385
386 /*
387 * We drop packet when:
388 * 1. libalias returns PKT_ALIAS_ERROR;
389 * 2. For incoming packets:
390 * a) for unresolved fragments;
391 * b) libalias returns PKT_ALIAS_IGNORED and
392 * PKT_ALIAS_DENY_INCOMING flag is set.
393 */
394 if (retval == PKT_ALIAS_ERROR ||
395 ((args->flags & IPFW_ARGS_IN) &&
396 (retval == PKT_ALIAS_UNRESOLVED_FRAGMENT ||
397 (retval == PKT_ALIAS_IGNORED &&
398 (t->mode & PKT_ALIAS_DENY_INCOMING) != 0)))) {
399 /* XXX - should i add some logging? */
400 m_free(mcl);
401 args->m = NULL;
402 return (IP_FW_DENY);
403 }
404
405 if (retval == PKT_ALIAS_RESPOND)
406 mcl->m_flags |= M_SKIP_FIREWALL;
407 mcl->m_pkthdr.len = mcl->m_len = ntohs(ip->ip_len);
408
409 /*
410 * XXX - libalias checksum offload
411 * 'duct tape' (see above)
412 */
413
414 if ((ip->ip_off & htons(IP_OFFMASK)) == 0 &&
415 ip->ip_p == IPPROTO_TCP) {
416 struct tcphdr *th;
417
418 th = (struct tcphdr *)(ip + 1);
419 if (th->th_x2 & (TH_RES1 >> 8))
420 ldt = 1;
421 }
422
423 if (ldt) {
424 struct tcphdr *th;
425 struct udphdr *uh;
426 uint16_t ip_len, cksum;
427
428 ip_len = ntohs(ip->ip_len);
429 cksum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
430 htons(ip->ip_p + ip_len - (ip->ip_hl << 2)));
431
432 switch (ip->ip_p) {
433 case IPPROTO_TCP:
434 th = (struct tcphdr *)(ip + 1);
435 /*
436 * Maybe it was set in
437 * libalias...
438 */
439 th->th_x2 &= ~(TH_RES1 >> 8);
440 th->th_sum = cksum;
441 mcl->m_pkthdr.csum_data =
442 offsetof(struct tcphdr, th_sum);
443 break;
444 case IPPROTO_UDP:
445 uh = (struct udphdr *)(ip + 1);
446 uh->uh_sum = cksum;
447 mcl->m_pkthdr.csum_data =
448 offsetof(struct udphdr, uh_sum);
449 break;
450 }
451 /* No hw checksum offloading: do it ourselves */
452 if ((mcl->m_pkthdr.csum_flags & CSUM_DELAY_DATA) == 0) {
453 in_delayed_cksum(mcl);
454 mcl->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
455 }
456 }
457 args->m = mcl;
458 return (IP_FW_NAT);
459 }
460
461 static struct cfg_nat *
lookup_nat(struct nat_list * l,int nat_id)462 lookup_nat(struct nat_list *l, int nat_id)
463 {
464 struct cfg_nat *res;
465
466 LIST_FOREACH(res, l, _next) {
467 if (res->id == nat_id)
468 break;
469 }
470 return res;
471 }
472
473 static struct cfg_nat *
lookup_nat_name(struct nat_list * l,char * name)474 lookup_nat_name(struct nat_list *l, char *name)
475 {
476 struct cfg_nat *res;
477 int id;
478 char *errptr;
479
480 id = strtol(name, &errptr, 10);
481 if (id == 0 || *errptr != '\0')
482 return (NULL);
483
484 LIST_FOREACH(res, l, _next) {
485 if (res->id == id)
486 break;
487 }
488 return (res);
489 }
490
491 /* IP_FW3 configuration routines */
492
493 static void
nat44_config(struct ip_fw_chain * chain,struct nat44_cfg_nat * ucfg)494 nat44_config(struct ip_fw_chain *chain, struct nat44_cfg_nat *ucfg)
495 {
496 struct cfg_nat *ptr, *tcfg;
497 int gencnt;
498
499 /*
500 * Find/create nat rule.
501 */
502 IPFW_UH_WLOCK(chain);
503 gencnt = chain->gencnt;
504 ptr = lookup_nat_name(&chain->nat, ucfg->name);
505 if (ptr == NULL) {
506 IPFW_UH_WUNLOCK(chain);
507 /* New rule: allocate and init new instance. */
508 ptr = malloc(sizeof(struct cfg_nat), M_IPFW, M_WAITOK | M_ZERO);
509 ptr->lib = LibAliasInit(NULL);
510 LIST_INIT(&ptr->redir_chain);
511 } else {
512 /* Entry already present: temporarily unhook it. */
513 IPFW_WLOCK(chain);
514 LIST_REMOVE(ptr, _next);
515 flush_nat_ptrs(chain, ptr->id);
516 IPFW_WUNLOCK(chain);
517 IPFW_UH_WUNLOCK(chain);
518 }
519
520 /*
521 * Basic nat (re)configuration.
522 */
523 ptr->id = strtol(ucfg->name, NULL, 10);
524 /*
525 * XXX - what if this rule doesn't nat any ip and just
526 * redirect?
527 * do we set aliasaddress to 0.0.0.0?
528 */
529 ptr->ip = ucfg->ip;
530 ptr->redir_cnt = ucfg->redir_cnt;
531 ptr->mode = ucfg->mode;
532 ptr->alias_port_lo = ucfg->alias_port_lo;
533 ptr->alias_port_hi = ucfg->alias_port_hi;
534 strlcpy(ptr->if_name, ucfg->if_name, sizeof(ptr->if_name));
535 LibAliasSetMode(ptr->lib, ptr->mode, ~0);
536 LibAliasSetAddress(ptr->lib, ptr->ip);
537 LibAliasSetAliasPortRange(ptr->lib, ptr->alias_port_lo, ptr->alias_port_hi);
538
539 /*
540 * Redir and LSNAT configuration.
541 */
542 /* Delete old cfgs. */
543 del_redir_spool_cfg(ptr, &ptr->redir_chain);
544 /* Add new entries. */
545 add_redir_spool_cfg((char *)(ucfg + 1), ptr);
546 IPFW_UH_WLOCK(chain);
547
548 /* Extra check to avoid race with another ipfw_nat_cfg() */
549 tcfg = NULL;
550 if (gencnt != chain->gencnt)
551 tcfg = lookup_nat_name(&chain->nat, ucfg->name);
552 IPFW_WLOCK(chain);
553 if (tcfg != NULL)
554 LIST_REMOVE(tcfg, _next);
555 LIST_INSERT_HEAD(&chain->nat, ptr, _next);
556 IPFW_WUNLOCK(chain);
557 chain->gencnt++;
558
559 IPFW_UH_WUNLOCK(chain);
560
561 if (tcfg != NULL)
562 free_nat_instance(ptr);
563 }
564
565 /*
566 * Creates/configure nat44 instance
567 * Data layout (v0)(current):
568 * Request: [ ipfw_obj_header nat44_cfg_nat .. ]
569 *
570 * Returns 0 on success
571 */
572 static int
nat44_cfg(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)573 nat44_cfg(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
574 struct sockopt_data *sd)
575 {
576 ipfw_obj_header *oh;
577 struct nat44_cfg_nat *ucfg;
578 int id;
579 size_t read;
580 char *errptr;
581
582 /* Check minimum header size */
583 if (sd->valsize < (sizeof(*oh) + sizeof(*ucfg)))
584 return (EINVAL);
585
586 oh = (ipfw_obj_header *)sd->kbuf;
587
588 /* Basic length checks for TLVs */
589 if (oh->ntlv.head.length != sizeof(oh->ntlv))
590 return (EINVAL);
591
592 ucfg = (struct nat44_cfg_nat *)(oh + 1);
593
594 /* Check if name is properly terminated and looks like number */
595 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
596 return (EINVAL);
597 id = strtol(ucfg->name, &errptr, 10);
598 if (id == 0 || *errptr != '\0')
599 return (EINVAL);
600
601 read = sizeof(*oh) + sizeof(*ucfg);
602 /* Check number of redirs */
603 if (sd->valsize < read + ucfg->redir_cnt*sizeof(struct nat44_cfg_redir))
604 return (EINVAL);
605
606 nat44_config(chain, ucfg);
607 return (0);
608 }
609
610 /*
611 * Destroys given nat instances.
612 * Data layout (v0)(current):
613 * Request: [ ipfw_obj_header ]
614 *
615 * Returns 0 on success
616 */
617 static int
nat44_destroy(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)618 nat44_destroy(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
619 struct sockopt_data *sd)
620 {
621 ipfw_obj_header *oh;
622 struct cfg_nat *ptr;
623 ipfw_obj_ntlv *ntlv;
624
625 /* Check minimum header size */
626 if (sd->valsize < sizeof(*oh))
627 return (EINVAL);
628
629 oh = (ipfw_obj_header *)sd->kbuf;
630
631 /* Basic length checks for TLVs */
632 if (oh->ntlv.head.length != sizeof(oh->ntlv))
633 return (EINVAL);
634
635 ntlv = &oh->ntlv;
636 /* Check if name is properly terminated */
637 if (strnlen(ntlv->name, sizeof(ntlv->name)) == sizeof(ntlv->name))
638 return (EINVAL);
639
640 IPFW_UH_WLOCK(chain);
641 ptr = lookup_nat_name(&chain->nat, ntlv->name);
642 if (ptr == NULL) {
643 IPFW_UH_WUNLOCK(chain);
644 return (ESRCH);
645 }
646 IPFW_WLOCK(chain);
647 LIST_REMOVE(ptr, _next);
648 flush_nat_ptrs(chain, ptr->id);
649 IPFW_WUNLOCK(chain);
650 IPFW_UH_WUNLOCK(chain);
651
652 free_nat_instance(ptr);
653
654 return (0);
655 }
656
657 static void
export_nat_cfg(struct cfg_nat * ptr,struct nat44_cfg_nat * ucfg)658 export_nat_cfg(struct cfg_nat *ptr, struct nat44_cfg_nat *ucfg)
659 {
660
661 snprintf(ucfg->name, sizeof(ucfg->name), "%d", ptr->id);
662 ucfg->ip = ptr->ip;
663 ucfg->redir_cnt = ptr->redir_cnt;
664 ucfg->mode = ptr->mode;
665 ucfg->alias_port_lo = ptr->alias_port_lo;
666 ucfg->alias_port_hi = ptr->alias_port_hi;
667 strlcpy(ucfg->if_name, ptr->if_name, sizeof(ucfg->if_name));
668 }
669
670 /*
671 * Gets config for given nat instance
672 * Data layout (v0)(current):
673 * Request: [ ipfw_obj_header nat44_cfg_nat .. ]
674 *
675 * Returns 0 on success
676 */
677 static int
nat44_get_cfg(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)678 nat44_get_cfg(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
679 struct sockopt_data *sd)
680 {
681 ipfw_obj_header *oh;
682 struct nat44_cfg_nat *ucfg;
683 struct cfg_nat *ptr;
684 struct cfg_redir *r;
685 struct cfg_spool *s;
686 struct nat44_cfg_redir *ser_r;
687 struct nat44_cfg_spool *ser_s;
688 size_t sz;
689
690 sz = sizeof(*oh) + sizeof(*ucfg);
691 /* Check minimum header size */
692 if (sd->valsize < sz)
693 return (EINVAL);
694
695 oh = (struct _ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
696
697 /* Basic length checks for TLVs */
698 if (oh->ntlv.head.length != sizeof(oh->ntlv))
699 return (EINVAL);
700
701 ucfg = (struct nat44_cfg_nat *)(oh + 1);
702
703 /* Check if name is properly terminated */
704 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
705 return (EINVAL);
706
707 IPFW_UH_RLOCK(chain);
708 ptr = lookup_nat_name(&chain->nat, ucfg->name);
709 if (ptr == NULL) {
710 IPFW_UH_RUNLOCK(chain);
711 return (ESRCH);
712 }
713
714 export_nat_cfg(ptr, ucfg);
715
716 /* Estimate memory amount */
717 sz = sizeof(ipfw_obj_header) + sizeof(struct nat44_cfg_nat);
718 LIST_FOREACH(r, &ptr->redir_chain, _next) {
719 sz += sizeof(struct nat44_cfg_redir);
720 LIST_FOREACH(s, &r->spool_chain, _next)
721 sz += sizeof(struct nat44_cfg_spool);
722 }
723
724 ucfg->size = sz;
725 if (sd->valsize < sz) {
726 /*
727 * Submitted buffer size is not enough.
728 * WE've already filled in @ucfg structure with
729 * relevant info including size, so we
730 * can return. Buffer will be flushed automatically.
731 */
732 IPFW_UH_RUNLOCK(chain);
733 return (ENOMEM);
734 }
735
736 /* Size OK, let's copy data */
737 LIST_FOREACH(r, &ptr->redir_chain, _next) {
738 ser_r = (struct nat44_cfg_redir *)ipfw_get_sopt_space(sd,
739 sizeof(*ser_r));
740 ser_r->mode = r->mode;
741 ser_r->laddr = r->laddr;
742 ser_r->paddr = r->paddr;
743 ser_r->raddr = r->raddr;
744 ser_r->lport = r->lport;
745 ser_r->pport = r->pport;
746 ser_r->rport = r->rport;
747 ser_r->pport_cnt = r->pport_cnt;
748 ser_r->rport_cnt = r->rport_cnt;
749 ser_r->proto = r->proto;
750 ser_r->spool_cnt = r->spool_cnt;
751
752 LIST_FOREACH(s, &r->spool_chain, _next) {
753 ser_s = (struct nat44_cfg_spool *)ipfw_get_sopt_space(
754 sd, sizeof(*ser_s));
755
756 ser_s->addr = s->addr;
757 ser_s->port = s->port;
758 }
759 }
760
761 IPFW_UH_RUNLOCK(chain);
762
763 return (0);
764 }
765
766 /*
767 * Lists all nat44 instances currently available in kernel.
768 * Data layout (v0)(current):
769 * Request: [ ipfw_obj_lheader ]
770 * Reply: [ ipfw_obj_lheader nat44_cfg_nat x N ]
771 *
772 * Returns 0 on success
773 */
774 static int
nat44_list_nat(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)775 nat44_list_nat(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
776 struct sockopt_data *sd)
777 {
778 ipfw_obj_lheader *olh;
779 struct nat44_cfg_nat *ucfg;
780 struct cfg_nat *ptr;
781 int nat_count;
782
783 /* Check minimum header size */
784 if (sd->valsize < sizeof(ipfw_obj_lheader))
785 return (EINVAL);
786
787 olh = (ipfw_obj_lheader *)ipfw_get_sopt_header(sd, sizeof(*olh));
788 IPFW_UH_RLOCK(chain);
789 nat_count = 0;
790 LIST_FOREACH(ptr, &chain->nat, _next)
791 nat_count++;
792
793 olh->count = nat_count;
794 olh->objsize = sizeof(struct nat44_cfg_nat);
795 olh->size = sizeof(*olh) + olh->count * olh->objsize;
796
797 if (sd->valsize < olh->size) {
798 IPFW_UH_RUNLOCK(chain);
799 return (ENOMEM);
800 }
801
802 LIST_FOREACH(ptr, &chain->nat, _next) {
803 ucfg = (struct nat44_cfg_nat *)ipfw_get_sopt_space(sd,
804 sizeof(*ucfg));
805 export_nat_cfg(ptr, ucfg);
806 }
807
808 IPFW_UH_RUNLOCK(chain);
809
810 return (0);
811 }
812
813 /*
814 * Gets log for given nat instance
815 * Data layout (v0)(current):
816 * Request: [ ipfw_obj_header nat44_cfg_nat ]
817 * Reply: [ ipfw_obj_header nat44_cfg_nat LOGBUFFER ]
818 *
819 * Returns 0 on success
820 */
821 static int
nat44_get_log(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)822 nat44_get_log(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
823 struct sockopt_data *sd)
824 {
825 ipfw_obj_header *oh;
826 struct nat44_cfg_nat *ucfg;
827 struct cfg_nat *ptr;
828 void *pbuf;
829 size_t sz;
830
831 sz = sizeof(*oh) + sizeof(*ucfg);
832 /* Check minimum header size */
833 if (sd->valsize < sz)
834 return (EINVAL);
835
836 oh = (struct _ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
837
838 /* Basic length checks for TLVs */
839 if (oh->ntlv.head.length != sizeof(oh->ntlv))
840 return (EINVAL);
841
842 ucfg = (struct nat44_cfg_nat *)(oh + 1);
843
844 /* Check if name is properly terminated */
845 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
846 return (EINVAL);
847
848 IPFW_UH_RLOCK(chain);
849 ptr = lookup_nat_name(&chain->nat, ucfg->name);
850 if (ptr == NULL) {
851 IPFW_UH_RUNLOCK(chain);
852 return (ESRCH);
853 }
854
855 if (ptr->lib->logDesc == NULL) {
856 IPFW_UH_RUNLOCK(chain);
857 return (ENOENT);
858 }
859
860 export_nat_cfg(ptr, ucfg);
861
862 /* Estimate memory amount */
863 ucfg->size = sizeof(struct nat44_cfg_nat) + LIBALIAS_BUF_SIZE;
864 if (sd->valsize < sz + sizeof(*oh)) {
865 /*
866 * Submitted buffer size is not enough.
867 * WE've already filled in @ucfg structure with
868 * relevant info including size, so we
869 * can return. Buffer will be flushed automatically.
870 */
871 IPFW_UH_RUNLOCK(chain);
872 return (ENOMEM);
873 }
874
875 pbuf = (void *)ipfw_get_sopt_space(sd, LIBALIAS_BUF_SIZE);
876 memcpy(pbuf, ptr->lib->logDesc, LIBALIAS_BUF_SIZE);
877
878 IPFW_UH_RUNLOCK(chain);
879
880 return (0);
881 }
882
883 static struct ipfw_sopt_handler scodes[] = {
884 { IP_FW_NAT44_XCONFIG, 0, HDIR_SET, nat44_cfg },
885 { IP_FW_NAT44_DESTROY, 0, HDIR_SET, nat44_destroy },
886 { IP_FW_NAT44_XGETCONFIG, 0, HDIR_GET, nat44_get_cfg },
887 { IP_FW_NAT44_LIST_NAT, 0, HDIR_GET, nat44_list_nat },
888 { IP_FW_NAT44_XGETLOG, 0, HDIR_GET, nat44_get_log },
889 };
890
891 /*
892 * Legacy configuration routines
893 */
894
895 struct cfg_spool_legacy {
896 LIST_ENTRY(cfg_spool_legacy) _next;
897 struct in_addr addr;
898 u_short port;
899 };
900
901 struct cfg_redir_legacy {
902 LIST_ENTRY(cfg_redir) _next;
903 u_int16_t mode;
904 struct in_addr laddr;
905 struct in_addr paddr;
906 struct in_addr raddr;
907 u_short lport;
908 u_short pport;
909 u_short rport;
910 u_short pport_cnt;
911 u_short rport_cnt;
912 int proto;
913 struct alias_link **alink;
914 u_int16_t spool_cnt;
915 LIST_HEAD(, cfg_spool_legacy) spool_chain;
916 };
917
918 struct cfg_nat_legacy {
919 LIST_ENTRY(cfg_nat_legacy) _next;
920 int id;
921 struct in_addr ip;
922 char if_name[IF_NAMESIZE];
923 int mode;
924 struct libalias *lib;
925 int redir_cnt;
926 LIST_HEAD(, cfg_redir_legacy) redir_chain;
927 };
928
929 static int
ipfw_nat_cfg(struct sockopt * sopt)930 ipfw_nat_cfg(struct sockopt *sopt)
931 {
932 struct cfg_nat_legacy *cfg;
933 struct nat44_cfg_nat *ucfg;
934 struct cfg_redir_legacy *rdir;
935 struct nat44_cfg_redir *urdir;
936 char *buf;
937 size_t len, len2;
938 int error, i;
939
940 len = sopt->sopt_valsize;
941 len2 = len + 128;
942
943 /*
944 * Allocate 2x buffer to store converted structures.
945 * new redir_cfg has shrunk, so we're sure that
946 * new buffer size is enough.
947 */
948 buf = malloc(roundup2(len, 8) + len2, M_TEMP, M_WAITOK | M_ZERO);
949 error = sooptcopyin(sopt, buf, len, sizeof(struct cfg_nat_legacy));
950 if (error != 0)
951 goto out;
952
953 cfg = (struct cfg_nat_legacy *)buf;
954 if (cfg->id < 0) {
955 error = EINVAL;
956 goto out;
957 }
958
959 ucfg = (struct nat44_cfg_nat *)&buf[roundup2(len, 8)];
960 snprintf(ucfg->name, sizeof(ucfg->name), "%d", cfg->id);
961 strlcpy(ucfg->if_name, cfg->if_name, sizeof(ucfg->if_name));
962 ucfg->ip = cfg->ip;
963 ucfg->mode = cfg->mode;
964 ucfg->redir_cnt = cfg->redir_cnt;
965
966 if (len < sizeof(*cfg) + cfg->redir_cnt * sizeof(*rdir)) {
967 error = EINVAL;
968 goto out;
969 }
970
971 urdir = (struct nat44_cfg_redir *)(ucfg + 1);
972 rdir = (struct cfg_redir_legacy *)(cfg + 1);
973 for (i = 0; i < cfg->redir_cnt; i++) {
974 urdir->mode = rdir->mode;
975 urdir->laddr = rdir->laddr;
976 urdir->paddr = rdir->paddr;
977 urdir->raddr = rdir->raddr;
978 urdir->lport = rdir->lport;
979 urdir->pport = rdir->pport;
980 urdir->rport = rdir->rport;
981 urdir->pport_cnt = rdir->pport_cnt;
982 urdir->rport_cnt = rdir->rport_cnt;
983 urdir->proto = rdir->proto;
984 urdir->spool_cnt = rdir->spool_cnt;
985
986 urdir++;
987 rdir++;
988 }
989
990 nat44_config(&V_layer3_chain, ucfg);
991
992 out:
993 free(buf, M_TEMP);
994 return (error);
995 }
996
997 static int
ipfw_nat_del(struct sockopt * sopt)998 ipfw_nat_del(struct sockopt *sopt)
999 {
1000 struct cfg_nat *ptr;
1001 struct ip_fw_chain *chain = &V_layer3_chain;
1002 int i;
1003
1004 sooptcopyin(sopt, &i, sizeof i, sizeof i);
1005 /* XXX validate i */
1006 IPFW_UH_WLOCK(chain);
1007 ptr = lookup_nat(&chain->nat, i);
1008 if (ptr == NULL) {
1009 IPFW_UH_WUNLOCK(chain);
1010 return (EINVAL);
1011 }
1012 IPFW_WLOCK(chain);
1013 LIST_REMOVE(ptr, _next);
1014 flush_nat_ptrs(chain, i);
1015 IPFW_WUNLOCK(chain);
1016 IPFW_UH_WUNLOCK(chain);
1017 free_nat_instance(ptr);
1018 return (0);
1019 }
1020
1021 static int
ipfw_nat_get_cfg(struct sockopt * sopt)1022 ipfw_nat_get_cfg(struct sockopt *sopt)
1023 {
1024 struct ip_fw_chain *chain = &V_layer3_chain;
1025 struct cfg_nat *n;
1026 struct cfg_nat_legacy *ucfg;
1027 struct cfg_redir *r;
1028 struct cfg_spool *s;
1029 struct cfg_redir_legacy *ser_r;
1030 struct cfg_spool_legacy *ser_s;
1031 char *data;
1032 int gencnt, nat_cnt, len, error;
1033
1034 nat_cnt = 0;
1035 len = sizeof(nat_cnt);
1036
1037 IPFW_UH_RLOCK(chain);
1038 retry:
1039 gencnt = chain->gencnt;
1040 /* Estimate memory amount */
1041 LIST_FOREACH(n, &chain->nat, _next) {
1042 nat_cnt++;
1043 len += sizeof(struct cfg_nat_legacy);
1044 LIST_FOREACH(r, &n->redir_chain, _next) {
1045 len += sizeof(struct cfg_redir_legacy);
1046 LIST_FOREACH(s, &r->spool_chain, _next)
1047 len += sizeof(struct cfg_spool_legacy);
1048 }
1049 }
1050 IPFW_UH_RUNLOCK(chain);
1051
1052 data = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
1053 bcopy(&nat_cnt, data, sizeof(nat_cnt));
1054
1055 nat_cnt = 0;
1056 len = sizeof(nat_cnt);
1057
1058 IPFW_UH_RLOCK(chain);
1059 if (gencnt != chain->gencnt) {
1060 free(data, M_TEMP);
1061 goto retry;
1062 }
1063 /* Serialize all the data. */
1064 LIST_FOREACH(n, &chain->nat, _next) {
1065 ucfg = (struct cfg_nat_legacy *)&data[len];
1066 ucfg->id = n->id;
1067 ucfg->ip = n->ip;
1068 ucfg->redir_cnt = n->redir_cnt;
1069 ucfg->mode = n->mode;
1070 strlcpy(ucfg->if_name, n->if_name, sizeof(ucfg->if_name));
1071 len += sizeof(struct cfg_nat_legacy);
1072 LIST_FOREACH(r, &n->redir_chain, _next) {
1073 ser_r = (struct cfg_redir_legacy *)&data[len];
1074 ser_r->mode = r->mode;
1075 ser_r->laddr = r->laddr;
1076 ser_r->paddr = r->paddr;
1077 ser_r->raddr = r->raddr;
1078 ser_r->lport = r->lport;
1079 ser_r->pport = r->pport;
1080 ser_r->rport = r->rport;
1081 ser_r->pport_cnt = r->pport_cnt;
1082 ser_r->rport_cnt = r->rport_cnt;
1083 ser_r->proto = r->proto;
1084 ser_r->spool_cnt = r->spool_cnt;
1085 len += sizeof(struct cfg_redir_legacy);
1086 LIST_FOREACH(s, &r->spool_chain, _next) {
1087 ser_s = (struct cfg_spool_legacy *)&data[len];
1088 ser_s->addr = s->addr;
1089 ser_s->port = s->port;
1090 len += sizeof(struct cfg_spool_legacy);
1091 }
1092 }
1093 }
1094 IPFW_UH_RUNLOCK(chain);
1095
1096 error = sooptcopyout(sopt, data, len);
1097 free(data, M_TEMP);
1098
1099 return (error);
1100 }
1101
1102 static int
ipfw_nat_get_log(struct sockopt * sopt)1103 ipfw_nat_get_log(struct sockopt *sopt)
1104 {
1105 uint8_t *data;
1106 struct cfg_nat *ptr;
1107 int i, size;
1108 struct ip_fw_chain *chain;
1109 IPFW_RLOCK_TRACKER;
1110
1111 chain = &V_layer3_chain;
1112
1113 IPFW_RLOCK(chain);
1114 /* one pass to count, one to copy the data */
1115 i = 0;
1116 LIST_FOREACH(ptr, &chain->nat, _next) {
1117 if (ptr->lib->logDesc == NULL)
1118 continue;
1119 i++;
1120 }
1121 size = i * (LIBALIAS_BUF_SIZE + sizeof(int));
1122 data = malloc(size, M_IPFW, M_NOWAIT | M_ZERO);
1123 if (data == NULL) {
1124 IPFW_RUNLOCK(chain);
1125 return (ENOSPC);
1126 }
1127 i = 0;
1128 LIST_FOREACH(ptr, &chain->nat, _next) {
1129 if (ptr->lib->logDesc == NULL)
1130 continue;
1131 bcopy(&ptr->id, &data[i], sizeof(int));
1132 i += sizeof(int);
1133 bcopy(ptr->lib->logDesc, &data[i], LIBALIAS_BUF_SIZE);
1134 i += LIBALIAS_BUF_SIZE;
1135 }
1136 IPFW_RUNLOCK(chain);
1137 sooptcopyout(sopt, data, size);
1138 free(data, M_IPFW);
1139 return(0);
1140 }
1141
1142 static int
vnet_ipfw_nat_init(const void * arg __unused)1143 vnet_ipfw_nat_init(const void *arg __unused)
1144 {
1145
1146 V_ipfw_nat_ready = 1;
1147 return (0);
1148 }
1149
1150 static int
vnet_ipfw_nat_uninit(const void * arg __unused)1151 vnet_ipfw_nat_uninit(const void *arg __unused)
1152 {
1153 struct cfg_nat *ptr, *ptr_temp;
1154 struct ip_fw_chain *chain;
1155
1156 chain = &V_layer3_chain;
1157 IPFW_WLOCK(chain);
1158 V_ipfw_nat_ready = 0;
1159 LIST_FOREACH_SAFE(ptr, &chain->nat, _next, ptr_temp) {
1160 LIST_REMOVE(ptr, _next);
1161 free_nat_instance(ptr);
1162 }
1163 flush_nat_ptrs(chain, -1 /* flush all */);
1164 IPFW_WUNLOCK(chain);
1165 return (0);
1166 }
1167
1168 static void
ipfw_nat_init(void)1169 ipfw_nat_init(void)
1170 {
1171
1172 /* init ipfw hooks */
1173 ipfw_nat_ptr = ipfw_nat;
1174 lookup_nat_ptr = lookup_nat;
1175 ipfw_nat_cfg_ptr = ipfw_nat_cfg;
1176 ipfw_nat_del_ptr = ipfw_nat_del;
1177 ipfw_nat_get_cfg_ptr = ipfw_nat_get_cfg;
1178 ipfw_nat_get_log_ptr = ipfw_nat_get_log;
1179 IPFW_ADD_SOPT_HANDLER(1, scodes);
1180
1181 ifaddr_event_tag = EVENTHANDLER_REGISTER(ifaddr_event, ifaddr_change,
1182 NULL, EVENTHANDLER_PRI_ANY);
1183 }
1184
1185 static void
ipfw_nat_destroy(void)1186 ipfw_nat_destroy(void)
1187 {
1188
1189 EVENTHANDLER_DEREGISTER(ifaddr_event, ifaddr_event_tag);
1190 /* deregister ipfw_nat */
1191 IPFW_DEL_SOPT_HANDLER(1, scodes);
1192 ipfw_nat_ptr = NULL;
1193 lookup_nat_ptr = NULL;
1194 ipfw_nat_cfg_ptr = NULL;
1195 ipfw_nat_del_ptr = NULL;
1196 ipfw_nat_get_cfg_ptr = NULL;
1197 ipfw_nat_get_log_ptr = NULL;
1198 }
1199
1200 static int
ipfw_nat_modevent(module_t mod,int type,void * unused)1201 ipfw_nat_modevent(module_t mod, int type, void *unused)
1202 {
1203 int err = 0;
1204
1205 switch (type) {
1206 case MOD_LOAD:
1207 break;
1208
1209 case MOD_UNLOAD:
1210 break;
1211
1212 default:
1213 return EOPNOTSUPP;
1214 break;
1215 }
1216 return err;
1217 }
1218
1219 static moduledata_t ipfw_nat_mod = {
1220 "ipfw_nat",
1221 ipfw_nat_modevent,
1222 0
1223 };
1224
1225 /* Define startup order. */
1226 #define IPFW_NAT_SI_SUB_FIREWALL SI_SUB_PROTO_FIREWALL
1227 #define IPFW_NAT_MODEVENT_ORDER (SI_ORDER_ANY - 128) /* after ipfw */
1228 #define IPFW_NAT_MODULE_ORDER (IPFW_NAT_MODEVENT_ORDER + 1)
1229 #define IPFW_NAT_VNET_ORDER (IPFW_NAT_MODEVENT_ORDER + 2)
1230
1231 DECLARE_MODULE(ipfw_nat, ipfw_nat_mod, IPFW_NAT_SI_SUB_FIREWALL, SI_ORDER_ANY);
1232 MODULE_DEPEND(ipfw_nat, libalias, 1, 1, 1);
1233 MODULE_DEPEND(ipfw_nat, ipfw, 3, 3, 3);
1234 MODULE_VERSION(ipfw_nat, 1);
1235
1236 SYSINIT(ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
1237 ipfw_nat_init, NULL);
1238 VNET_SYSINIT(vnet_ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_VNET_ORDER,
1239 vnet_ipfw_nat_init, NULL);
1240
1241 SYSUNINIT(ipfw_nat_destroy, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
1242 ipfw_nat_destroy, NULL);
1243 VNET_SYSUNINIT(vnet_ipfw_nat_uninit, IPFW_NAT_SI_SUB_FIREWALL,
1244 IPFW_NAT_VNET_ORDER, vnet_ipfw_nat_uninit, NULL);
1245
1246 /* end of file */
1247