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 (tcp_get_flags(th) & TH_RES1)
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 tcp_set_flags(th, tcp_get_flags(th) & ~TH_RES1);
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 /* 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 }
517
518 /*
519 * Basic nat (re)configuration.
520 */
521 ptr->id = strtol(ucfg->name, NULL, 10);
522 /*
523 * XXX - what if this rule doesn't nat any ip and just
524 * redirect?
525 * do we set aliasaddress to 0.0.0.0?
526 */
527 ptr->ip = ucfg->ip;
528 ptr->redir_cnt = ucfg->redir_cnt;
529 ptr->mode = ucfg->mode;
530 ptr->alias_port_lo = ucfg->alias_port_lo;
531 ptr->alias_port_hi = ucfg->alias_port_hi;
532 strlcpy(ptr->if_name, ucfg->if_name, sizeof(ptr->if_name));
533 LibAliasSetMode(ptr->lib, ptr->mode, ~0);
534 LibAliasSetAddress(ptr->lib, ptr->ip);
535 LibAliasSetAliasPortRange(ptr->lib, ptr->alias_port_lo, ptr->alias_port_hi);
536
537 /*
538 * Redir and LSNAT configuration.
539 */
540 /* Delete old cfgs. */
541 del_redir_spool_cfg(ptr, &ptr->redir_chain);
542 /* Add new entries. */
543 add_redir_spool_cfg((char *)(ucfg + 1), ptr);
544
545 /* Extra check to avoid race with another ipfw_nat_cfg() */
546 tcfg = NULL;
547 if (gencnt != chain->gencnt)
548 tcfg = lookup_nat_name(&chain->nat, ucfg->name);
549 IPFW_WLOCK(chain);
550 if (tcfg != NULL)
551 LIST_REMOVE(tcfg, _next);
552 LIST_INSERT_HEAD(&chain->nat, ptr, _next);
553 IPFW_WUNLOCK(chain);
554 chain->gencnt++;
555
556 IPFW_UH_WUNLOCK(chain);
557
558 if (tcfg != NULL)
559 free_nat_instance(ptr);
560 }
561
562 /*
563 * Creates/configure nat44 instance
564 * Data layout (v0)(current):
565 * Request: [ ipfw_obj_header nat44_cfg_nat .. ]
566 *
567 * Returns 0 on success
568 */
569 static int
nat44_cfg(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)570 nat44_cfg(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
571 struct sockopt_data *sd)
572 {
573 ipfw_obj_header *oh;
574 struct nat44_cfg_nat *ucfg;
575 int id;
576 size_t read;
577 char *errptr;
578
579 /* Check minimum header size */
580 if (sd->valsize < (sizeof(*oh) + sizeof(*ucfg)))
581 return (EINVAL);
582
583 oh = (ipfw_obj_header *)sd->kbuf;
584
585 /* Basic length checks for TLVs */
586 if (oh->ntlv.head.length != sizeof(oh->ntlv))
587 return (EINVAL);
588
589 ucfg = (struct nat44_cfg_nat *)(oh + 1);
590
591 /* Check if name is properly terminated and looks like number */
592 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
593 return (EINVAL);
594 id = strtol(ucfg->name, &errptr, 10);
595 if (id == 0 || *errptr != '\0')
596 return (EINVAL);
597
598 read = sizeof(*oh) + sizeof(*ucfg);
599 /* Check number of redirs */
600 if (sd->valsize < read + ucfg->redir_cnt*sizeof(struct nat44_cfg_redir))
601 return (EINVAL);
602
603 nat44_config(chain, ucfg);
604 return (0);
605 }
606
607 /*
608 * Destroys given nat instances.
609 * Data layout (v0)(current):
610 * Request: [ ipfw_obj_header ]
611 *
612 * Returns 0 on success
613 */
614 static int
nat44_destroy(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)615 nat44_destroy(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
616 struct sockopt_data *sd)
617 {
618 ipfw_obj_header *oh;
619 struct cfg_nat *ptr;
620 ipfw_obj_ntlv *ntlv;
621
622 /* Check minimum header size */
623 if (sd->valsize < sizeof(*oh))
624 return (EINVAL);
625
626 oh = (ipfw_obj_header *)sd->kbuf;
627
628 /* Basic length checks for TLVs */
629 if (oh->ntlv.head.length != sizeof(oh->ntlv))
630 return (EINVAL);
631
632 ntlv = &oh->ntlv;
633 /* Check if name is properly terminated */
634 if (strnlen(ntlv->name, sizeof(ntlv->name)) == sizeof(ntlv->name))
635 return (EINVAL);
636
637 IPFW_UH_WLOCK(chain);
638 ptr = lookup_nat_name(&chain->nat, ntlv->name);
639 if (ptr == NULL) {
640 IPFW_UH_WUNLOCK(chain);
641 return (ESRCH);
642 }
643 IPFW_WLOCK(chain);
644 LIST_REMOVE(ptr, _next);
645 flush_nat_ptrs(chain, ptr->id);
646 IPFW_WUNLOCK(chain);
647 IPFW_UH_WUNLOCK(chain);
648
649 free_nat_instance(ptr);
650
651 return (0);
652 }
653
654 static void
export_nat_cfg(struct cfg_nat * ptr,struct nat44_cfg_nat * ucfg)655 export_nat_cfg(struct cfg_nat *ptr, struct nat44_cfg_nat *ucfg)
656 {
657
658 snprintf(ucfg->name, sizeof(ucfg->name), "%d", ptr->id);
659 ucfg->ip = ptr->ip;
660 ucfg->redir_cnt = ptr->redir_cnt;
661 ucfg->mode = ptr->mode;
662 ucfg->alias_port_lo = ptr->alias_port_lo;
663 ucfg->alias_port_hi = ptr->alias_port_hi;
664 strlcpy(ucfg->if_name, ptr->if_name, sizeof(ucfg->if_name));
665 }
666
667 /*
668 * Gets config for given nat instance
669 * Data layout (v0)(current):
670 * Request: [ ipfw_obj_header nat44_cfg_nat .. ]
671 *
672 * Returns 0 on success
673 */
674 static int
nat44_get_cfg(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)675 nat44_get_cfg(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
676 struct sockopt_data *sd)
677 {
678 ipfw_obj_header *oh;
679 struct nat44_cfg_nat *ucfg;
680 struct cfg_nat *ptr;
681 struct cfg_redir *r;
682 struct cfg_spool *s;
683 struct nat44_cfg_redir *ser_r;
684 struct nat44_cfg_spool *ser_s;
685 size_t sz;
686
687 sz = sizeof(*oh) + sizeof(*ucfg);
688 /* Check minimum header size */
689 if (sd->valsize < sz)
690 return (EINVAL);
691
692 oh = (struct _ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
693
694 /* Basic length checks for TLVs */
695 if (oh->ntlv.head.length != sizeof(oh->ntlv))
696 return (EINVAL);
697
698 ucfg = (struct nat44_cfg_nat *)(oh + 1);
699
700 /* Check if name is properly terminated */
701 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
702 return (EINVAL);
703
704 IPFW_UH_RLOCK(chain);
705 ptr = lookup_nat_name(&chain->nat, ucfg->name);
706 if (ptr == NULL) {
707 IPFW_UH_RUNLOCK(chain);
708 return (ESRCH);
709 }
710
711 export_nat_cfg(ptr, ucfg);
712
713 /* Estimate memory amount */
714 sz = sizeof(ipfw_obj_header) + sizeof(struct nat44_cfg_nat);
715 LIST_FOREACH(r, &ptr->redir_chain, _next) {
716 sz += sizeof(struct nat44_cfg_redir);
717 LIST_FOREACH(s, &r->spool_chain, _next)
718 sz += sizeof(struct nat44_cfg_spool);
719 }
720
721 ucfg->size = sz;
722 if (sd->valsize < sz) {
723 /*
724 * Submitted buffer size is not enough.
725 * WE've already filled in @ucfg structure with
726 * relevant info including size, so we
727 * can return. Buffer will be flushed automatically.
728 */
729 IPFW_UH_RUNLOCK(chain);
730 return (ENOMEM);
731 }
732
733 /* Size OK, let's copy data */
734 LIST_FOREACH(r, &ptr->redir_chain, _next) {
735 ser_r = (struct nat44_cfg_redir *)ipfw_get_sopt_space(sd,
736 sizeof(*ser_r));
737 ser_r->mode = r->mode;
738 ser_r->laddr = r->laddr;
739 ser_r->paddr = r->paddr;
740 ser_r->raddr = r->raddr;
741 ser_r->lport = r->lport;
742 ser_r->pport = r->pport;
743 ser_r->rport = r->rport;
744 ser_r->pport_cnt = r->pport_cnt;
745 ser_r->rport_cnt = r->rport_cnt;
746 ser_r->proto = r->proto;
747 ser_r->spool_cnt = r->spool_cnt;
748
749 LIST_FOREACH(s, &r->spool_chain, _next) {
750 ser_s = (struct nat44_cfg_spool *)ipfw_get_sopt_space(
751 sd, sizeof(*ser_s));
752
753 ser_s->addr = s->addr;
754 ser_s->port = s->port;
755 }
756 }
757
758 IPFW_UH_RUNLOCK(chain);
759
760 return (0);
761 }
762
763 /*
764 * Lists all nat44 instances currently available in kernel.
765 * Data layout (v0)(current):
766 * Request: [ ipfw_obj_lheader ]
767 * Reply: [ ipfw_obj_lheader nat44_cfg_nat x N ]
768 *
769 * Returns 0 on success
770 */
771 static int
nat44_list_nat(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)772 nat44_list_nat(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
773 struct sockopt_data *sd)
774 {
775 ipfw_obj_lheader *olh;
776 struct nat44_cfg_nat *ucfg;
777 struct cfg_nat *ptr;
778 int nat_count;
779
780 /* Check minimum header size */
781 if (sd->valsize < sizeof(ipfw_obj_lheader))
782 return (EINVAL);
783
784 olh = (ipfw_obj_lheader *)ipfw_get_sopt_header(sd, sizeof(*olh));
785 IPFW_UH_RLOCK(chain);
786 nat_count = 0;
787 LIST_FOREACH(ptr, &chain->nat, _next)
788 nat_count++;
789
790 olh->count = nat_count;
791 olh->objsize = sizeof(struct nat44_cfg_nat);
792 olh->size = sizeof(*olh) + olh->count * olh->objsize;
793
794 if (sd->valsize < olh->size) {
795 IPFW_UH_RUNLOCK(chain);
796 return (ENOMEM);
797 }
798
799 LIST_FOREACH(ptr, &chain->nat, _next) {
800 ucfg = (struct nat44_cfg_nat *)ipfw_get_sopt_space(sd,
801 sizeof(*ucfg));
802 export_nat_cfg(ptr, ucfg);
803 }
804
805 IPFW_UH_RUNLOCK(chain);
806
807 return (0);
808 }
809
810 /*
811 * Gets log for given nat instance
812 * Data layout (v0)(current):
813 * Request: [ ipfw_obj_header nat44_cfg_nat ]
814 * Reply: [ ipfw_obj_header nat44_cfg_nat LOGBUFFER ]
815 *
816 * Returns 0 on success
817 */
818 static int
nat44_get_log(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)819 nat44_get_log(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
820 struct sockopt_data *sd)
821 {
822 ipfw_obj_header *oh;
823 struct nat44_cfg_nat *ucfg;
824 struct cfg_nat *ptr;
825 void *pbuf;
826 size_t sz;
827
828 sz = sizeof(*oh) + sizeof(*ucfg);
829 /* Check minimum header size */
830 if (sd->valsize < sz)
831 return (EINVAL);
832
833 oh = (struct _ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
834
835 /* Basic length checks for TLVs */
836 if (oh->ntlv.head.length != sizeof(oh->ntlv))
837 return (EINVAL);
838
839 ucfg = (struct nat44_cfg_nat *)(oh + 1);
840
841 /* Check if name is properly terminated */
842 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
843 return (EINVAL);
844
845 IPFW_UH_RLOCK(chain);
846 ptr = lookup_nat_name(&chain->nat, ucfg->name);
847 if (ptr == NULL) {
848 IPFW_UH_RUNLOCK(chain);
849 return (ESRCH);
850 }
851
852 if (ptr->lib->logDesc == NULL) {
853 IPFW_UH_RUNLOCK(chain);
854 return (ENOENT);
855 }
856
857 export_nat_cfg(ptr, ucfg);
858
859 /* Estimate memory amount */
860 ucfg->size = sizeof(struct nat44_cfg_nat) + LIBALIAS_BUF_SIZE;
861 if (sd->valsize < sz + sizeof(*oh)) {
862 /*
863 * Submitted buffer size is not enough.
864 * WE've already filled in @ucfg structure with
865 * relevant info including size, so we
866 * can return. Buffer will be flushed automatically.
867 */
868 IPFW_UH_RUNLOCK(chain);
869 return (ENOMEM);
870 }
871
872 pbuf = (void *)ipfw_get_sopt_space(sd, LIBALIAS_BUF_SIZE);
873 memcpy(pbuf, ptr->lib->logDesc, LIBALIAS_BUF_SIZE);
874
875 IPFW_UH_RUNLOCK(chain);
876
877 return (0);
878 }
879
880 static struct ipfw_sopt_handler scodes[] = {
881 { IP_FW_NAT44_XCONFIG, IP_FW3_OPVER, HDIR_SET, nat44_cfg },
882 { IP_FW_NAT44_DESTROY, IP_FW3_OPVER, HDIR_SET, nat44_destroy },
883 { IP_FW_NAT44_XGETCONFIG, IP_FW3_OPVER, HDIR_GET, nat44_get_cfg },
884 { IP_FW_NAT44_LIST_NAT, IP_FW3_OPVER, HDIR_GET, nat44_list_nat },
885 { IP_FW_NAT44_XGETLOG, IP_FW3_OPVER, HDIR_GET, nat44_get_log },
886 };
887
888 /*
889 * Legacy configuration routines
890 */
891
892 struct cfg_spool_legacy {
893 LIST_ENTRY(cfg_spool_legacy) _next;
894 struct in_addr addr;
895 u_short port;
896 };
897
898 struct cfg_redir_legacy {
899 LIST_ENTRY(cfg_redir) _next;
900 u_int16_t mode;
901 struct in_addr laddr;
902 struct in_addr paddr;
903 struct in_addr raddr;
904 u_short lport;
905 u_short pport;
906 u_short rport;
907 u_short pport_cnt;
908 u_short rport_cnt;
909 int proto;
910 struct alias_link **alink;
911 u_int16_t spool_cnt;
912 LIST_HEAD(, cfg_spool_legacy) spool_chain;
913 };
914
915 struct cfg_nat_legacy {
916 LIST_ENTRY(cfg_nat_legacy) _next;
917 int id;
918 struct in_addr ip;
919 char if_name[IF_NAMESIZE];
920 int mode;
921 struct libalias *lib;
922 int redir_cnt;
923 LIST_HEAD(, cfg_redir_legacy) redir_chain;
924 };
925
926 static int
ipfw_nat_cfg(struct sockopt * sopt)927 ipfw_nat_cfg(struct sockopt *sopt)
928 {
929 struct cfg_nat_legacy *cfg;
930 struct nat44_cfg_nat *ucfg;
931 struct cfg_redir_legacy *rdir;
932 struct nat44_cfg_redir *urdir;
933 char *buf;
934 size_t len, len2;
935 int error, i;
936
937 len = sopt->sopt_valsize;
938 len2 = len + 128;
939
940 /*
941 * Allocate 2x buffer to store converted structures.
942 * new redir_cfg has shrunk, so we're sure that
943 * new buffer size is enough.
944 */
945 buf = malloc(roundup2(len, 8) + len2, M_TEMP, M_WAITOK | M_ZERO);
946 error = sooptcopyin(sopt, buf, len, sizeof(struct cfg_nat_legacy));
947 if (error != 0)
948 goto out;
949
950 cfg = (struct cfg_nat_legacy *)buf;
951 if (cfg->id < 0) {
952 error = EINVAL;
953 goto out;
954 }
955
956 ucfg = (struct nat44_cfg_nat *)&buf[roundup2(len, 8)];
957 snprintf(ucfg->name, sizeof(ucfg->name), "%d", cfg->id);
958 strlcpy(ucfg->if_name, cfg->if_name, sizeof(ucfg->if_name));
959 ucfg->ip = cfg->ip;
960 ucfg->mode = cfg->mode;
961 ucfg->redir_cnt = cfg->redir_cnt;
962
963 if (len < sizeof(*cfg) + cfg->redir_cnt * sizeof(*rdir)) {
964 error = EINVAL;
965 goto out;
966 }
967
968 urdir = (struct nat44_cfg_redir *)(ucfg + 1);
969 rdir = (struct cfg_redir_legacy *)(cfg + 1);
970 for (i = 0; i < cfg->redir_cnt; i++) {
971 urdir->mode = rdir->mode;
972 urdir->laddr = rdir->laddr;
973 urdir->paddr = rdir->paddr;
974 urdir->raddr = rdir->raddr;
975 urdir->lport = rdir->lport;
976 urdir->pport = rdir->pport;
977 urdir->rport = rdir->rport;
978 urdir->pport_cnt = rdir->pport_cnt;
979 urdir->rport_cnt = rdir->rport_cnt;
980 urdir->proto = rdir->proto;
981 urdir->spool_cnt = rdir->spool_cnt;
982
983 urdir++;
984 rdir++;
985 }
986
987 nat44_config(&V_layer3_chain, ucfg);
988
989 out:
990 free(buf, M_TEMP);
991 return (error);
992 }
993
994 static int
ipfw_nat_del(struct sockopt * sopt)995 ipfw_nat_del(struct sockopt *sopt)
996 {
997 struct cfg_nat *ptr;
998 struct ip_fw_chain *chain = &V_layer3_chain;
999 int error, i;
1000
1001 error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
1002 if (error != 0)
1003 return (error);
1004 /* XXX validate i */
1005 IPFW_UH_WLOCK(chain);
1006 ptr = lookup_nat(&chain->nat, i);
1007 if (ptr == NULL) {
1008 IPFW_UH_WUNLOCK(chain);
1009 return (EINVAL);
1010 }
1011 IPFW_WLOCK(chain);
1012 LIST_REMOVE(ptr, _next);
1013 flush_nat_ptrs(chain, i);
1014 IPFW_WUNLOCK(chain);
1015 IPFW_UH_WUNLOCK(chain);
1016 free_nat_instance(ptr);
1017 return (0);
1018 }
1019
1020 static int
ipfw_nat_get_cfg(struct sockopt * sopt)1021 ipfw_nat_get_cfg(struct sockopt *sopt)
1022 {
1023 struct ip_fw_chain *chain = &V_layer3_chain;
1024 struct cfg_nat *n;
1025 struct cfg_nat_legacy *ucfg;
1026 struct cfg_redir *r;
1027 struct cfg_spool *s;
1028 struct cfg_redir_legacy *ser_r;
1029 struct cfg_spool_legacy *ser_s;
1030 char *data;
1031 int gencnt, nat_cnt, len, error;
1032
1033 nat_cnt = 0;
1034 len = sizeof(nat_cnt);
1035
1036 IPFW_UH_RLOCK(chain);
1037 retry:
1038 gencnt = chain->gencnt;
1039 /* Estimate memory amount */
1040 LIST_FOREACH(n, &chain->nat, _next) {
1041 nat_cnt++;
1042 len += sizeof(struct cfg_nat_legacy);
1043 LIST_FOREACH(r, &n->redir_chain, _next) {
1044 len += sizeof(struct cfg_redir_legacy);
1045 LIST_FOREACH(s, &r->spool_chain, _next)
1046 len += sizeof(struct cfg_spool_legacy);
1047 }
1048 }
1049
1050 data = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
1051 bcopy(&nat_cnt, data, sizeof(nat_cnt));
1052
1053 nat_cnt = 0;
1054 len = sizeof(nat_cnt);
1055
1056 if (gencnt != chain->gencnt) {
1057 free(data, M_TEMP);
1058 goto retry;
1059 }
1060 /* Serialize all the data. */
1061 LIST_FOREACH(n, &chain->nat, _next) {
1062 ucfg = (struct cfg_nat_legacy *)&data[len];
1063 ucfg->id = n->id;
1064 ucfg->ip = n->ip;
1065 ucfg->redir_cnt = n->redir_cnt;
1066 ucfg->mode = n->mode;
1067 strlcpy(ucfg->if_name, n->if_name, sizeof(ucfg->if_name));
1068 len += sizeof(struct cfg_nat_legacy);
1069 LIST_FOREACH(r, &n->redir_chain, _next) {
1070 ser_r = (struct cfg_redir_legacy *)&data[len];
1071 ser_r->mode = r->mode;
1072 ser_r->laddr = r->laddr;
1073 ser_r->paddr = r->paddr;
1074 ser_r->raddr = r->raddr;
1075 ser_r->lport = r->lport;
1076 ser_r->pport = r->pport;
1077 ser_r->rport = r->rport;
1078 ser_r->pport_cnt = r->pport_cnt;
1079 ser_r->rport_cnt = r->rport_cnt;
1080 ser_r->proto = r->proto;
1081 ser_r->spool_cnt = r->spool_cnt;
1082 len += sizeof(struct cfg_redir_legacy);
1083 LIST_FOREACH(s, &r->spool_chain, _next) {
1084 ser_s = (struct cfg_spool_legacy *)&data[len];
1085 ser_s->addr = s->addr;
1086 ser_s->port = s->port;
1087 len += sizeof(struct cfg_spool_legacy);
1088 }
1089 }
1090 }
1091 IPFW_UH_RUNLOCK(chain);
1092
1093 error = sooptcopyout(sopt, data, len);
1094 free(data, M_TEMP);
1095
1096 return (error);
1097 }
1098
1099 static int
ipfw_nat_get_log(struct sockopt * sopt)1100 ipfw_nat_get_log(struct sockopt *sopt)
1101 {
1102 uint8_t *data;
1103 struct cfg_nat *ptr;
1104 int error, i, size;
1105 struct ip_fw_chain *chain;
1106 IPFW_RLOCK_TRACKER;
1107
1108 chain = &V_layer3_chain;
1109
1110 IPFW_RLOCK(chain);
1111 /* one pass to count, one to copy the data */
1112 i = 0;
1113 LIST_FOREACH(ptr, &chain->nat, _next) {
1114 if (ptr->lib->logDesc == NULL)
1115 continue;
1116 i++;
1117 }
1118 size = i * (LIBALIAS_BUF_SIZE + sizeof(int));
1119 data = malloc(size, M_IPFW, M_NOWAIT | M_ZERO);
1120 if (data == NULL) {
1121 IPFW_RUNLOCK(chain);
1122 return (ENOSPC);
1123 }
1124 i = 0;
1125 LIST_FOREACH(ptr, &chain->nat, _next) {
1126 if (ptr->lib->logDesc == NULL)
1127 continue;
1128 bcopy(&ptr->id, &data[i], sizeof(int));
1129 i += sizeof(int);
1130 bcopy(ptr->lib->logDesc, &data[i], LIBALIAS_BUF_SIZE);
1131 i += LIBALIAS_BUF_SIZE;
1132 }
1133 IPFW_RUNLOCK(chain);
1134 error = sooptcopyout(sopt, data, size);
1135 free(data, M_IPFW);
1136 return (error);
1137 }
1138
1139 static int
vnet_ipfw_nat_init(const void * arg __unused)1140 vnet_ipfw_nat_init(const void *arg __unused)
1141 {
1142
1143 V_ipfw_nat_ready = 1;
1144 return (0);
1145 }
1146
1147 static int
vnet_ipfw_nat_uninit(const void * arg __unused)1148 vnet_ipfw_nat_uninit(const void *arg __unused)
1149 {
1150 struct cfg_nat *ptr, *ptr_temp;
1151 struct ip_fw_chain *chain;
1152
1153 chain = &V_layer3_chain;
1154 IPFW_WLOCK(chain);
1155 V_ipfw_nat_ready = 0;
1156 LIST_FOREACH_SAFE(ptr, &chain->nat, _next, ptr_temp) {
1157 LIST_REMOVE(ptr, _next);
1158 free_nat_instance(ptr);
1159 }
1160 flush_nat_ptrs(chain, -1 /* flush all */);
1161 IPFW_WUNLOCK(chain);
1162 return (0);
1163 }
1164
1165 static void
ipfw_nat_init(void * dummy __unused)1166 ipfw_nat_init(void *dummy __unused)
1167 {
1168
1169 /* init ipfw hooks */
1170 ipfw_nat_ptr = ipfw_nat;
1171 lookup_nat_ptr = lookup_nat;
1172 ipfw_nat_cfg_ptr = ipfw_nat_cfg;
1173 ipfw_nat_del_ptr = ipfw_nat_del;
1174 ipfw_nat_get_cfg_ptr = ipfw_nat_get_cfg;
1175 ipfw_nat_get_log_ptr = ipfw_nat_get_log;
1176 IPFW_ADD_SOPT_HANDLER(1, scodes);
1177
1178 ifaddr_event_tag = EVENTHANDLER_REGISTER(ifaddr_event, ifaddr_change,
1179 NULL, EVENTHANDLER_PRI_ANY);
1180 }
1181
1182 static void
ipfw_nat_destroy(void * dummy __unused)1183 ipfw_nat_destroy(void *dummy __unused)
1184 {
1185
1186 EVENTHANDLER_DEREGISTER(ifaddr_event, ifaddr_event_tag);
1187 /* deregister ipfw_nat */
1188 IPFW_DEL_SOPT_HANDLER(1, scodes);
1189 ipfw_nat_ptr = NULL;
1190 lookup_nat_ptr = NULL;
1191 ipfw_nat_cfg_ptr = NULL;
1192 ipfw_nat_del_ptr = NULL;
1193 ipfw_nat_get_cfg_ptr = NULL;
1194 ipfw_nat_get_log_ptr = NULL;
1195 }
1196
1197 static int
ipfw_nat_modevent(module_t mod,int type,void * unused)1198 ipfw_nat_modevent(module_t mod, int type, void *unused)
1199 {
1200 int err = 0;
1201
1202 switch (type) {
1203 case MOD_LOAD:
1204 break;
1205
1206 case MOD_UNLOAD:
1207 break;
1208
1209 default:
1210 return EOPNOTSUPP;
1211 break;
1212 }
1213 return err;
1214 }
1215
1216 static moduledata_t ipfw_nat_mod = {
1217 "ipfw_nat",
1218 ipfw_nat_modevent,
1219 0
1220 };
1221
1222 /* Define startup order. */
1223 #define IPFW_NAT_SI_SUB_FIREWALL SI_SUB_PROTO_FIREWALL
1224 #define IPFW_NAT_MODEVENT_ORDER (SI_ORDER_ANY - 128) /* after ipfw */
1225 #define IPFW_NAT_MODULE_ORDER (IPFW_NAT_MODEVENT_ORDER + 1)
1226 #define IPFW_NAT_VNET_ORDER (IPFW_NAT_MODEVENT_ORDER + 2)
1227
1228 DECLARE_MODULE(ipfw_nat, ipfw_nat_mod, IPFW_NAT_SI_SUB_FIREWALL, SI_ORDER_ANY);
1229 MODULE_DEPEND(ipfw_nat, libalias, 1, 1, 1);
1230 MODULE_DEPEND(ipfw_nat, ipfw, 3, 3, 3);
1231 MODULE_VERSION(ipfw_nat, 1);
1232
1233 SYSINIT(ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
1234 ipfw_nat_init, NULL);
1235 VNET_SYSINIT(vnet_ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_VNET_ORDER,
1236 vnet_ipfw_nat_init, NULL);
1237
1238 SYSUNINIT(ipfw_nat_destroy, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
1239 ipfw_nat_destroy, NULL);
1240 VNET_SYSUNINIT(vnet_ipfw_nat_uninit, IPFW_NAT_SI_SUB_FIREWALL,
1241 IPFW_NAT_VNET_ORDER, vnet_ipfw_nat_uninit, NULL);
1242
1243 /* end of file */
1244