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/cdefs.h>
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/eventhandler.h>
33 #include <sys/malloc.h>
34 #include <sys/mbuf.h>
35 #include <sys/kernel.h>
36 #include <sys/lock.h>
37 #include <sys/module.h>
38 #include <sys/rwlock.h>
39 #include <sys/rmlock.h>
40
41 #include <netinet/libalias/alias.h>
42 #include <netinet/libalias/alias_local.h>
43
44 #include <net/if.h>
45 #include <net/if_var.h>
46 #include <net/if_private.h>
47 #include <netinet/in.h>
48 #include <netinet/ip.h>
49 #include <netinet/ip_var.h>
50 #include <netinet/ip_fw.h>
51 #include <netinet/tcp.h>
52 #include <netinet/udp.h>
53
54 #include <netpfil/ipfw/ip_fw_private.h>
55
56 #include <machine/in_cksum.h> /* XXX for in_cksum */
57
58 struct cfg_spool {
59 LIST_ENTRY(cfg_spool) _next; /* chain of spool instances */
60 struct in_addr addr;
61 uint16_t port;
62 };
63
64 /* Nat redirect configuration. */
65 struct cfg_redir {
66 LIST_ENTRY(cfg_redir) _next; /* chain of redir instances */
67 uint16_t mode; /* type of redirect mode */
68 uint16_t proto; /* protocol: tcp/udp */
69 struct in_addr laddr; /* local ip address */
70 struct in_addr paddr; /* public ip address */
71 struct in_addr raddr; /* remote ip address */
72 uint16_t lport; /* local port */
73 uint16_t pport; /* public port */
74 uint16_t rport; /* remote port */
75 uint16_t pport_cnt; /* number of public ports */
76 uint16_t rport_cnt; /* number of remote ports */
77 struct alias_link **alink;
78 u_int16_t spool_cnt; /* num of entry in spool chain */
79 /* chain of spool instances */
80 LIST_HEAD(spool_chain, cfg_spool) spool_chain;
81 };
82
83 /* Nat configuration data struct. */
84 struct cfg_nat {
85 /* chain of nat instances */
86 LIST_ENTRY(cfg_nat) _next;
87 int id; /* nat id */
88 struct in_addr ip; /* nat ip address */
89 struct libalias *lib; /* libalias instance */
90 int mode; /* aliasing mode */
91 int redir_cnt; /* number of entry in spool chain */
92 /* chain of redir instances */
93 LIST_HEAD(redir_chain, cfg_redir) redir_chain;
94 char if_name[IF_NAMESIZE]; /* interface name */
95 u_short alias_port_lo; /* low range for port aliasing */
96 u_short alias_port_hi; /* high range for port aliasing */
97 };
98
99 static eventhandler_tag ifaddr_event_tag;
100
101 static void
ifaddr_change(void * arg __unused,struct ifnet * ifp)102 ifaddr_change(void *arg __unused, struct ifnet *ifp)
103 {
104 struct cfg_nat *ptr;
105 struct ifaddr *ifa;
106 struct ip_fw_chain *chain;
107
108 KASSERT(curvnet == ifp->if_vnet,
109 ("curvnet(%p) differs from iface vnet(%p)", curvnet, ifp->if_vnet));
110
111 if (V_ipfw_vnet_ready == 0 || V_ipfw_nat_ready == 0)
112 return;
113
114 chain = &V_layer3_chain;
115 IPFW_UH_WLOCK(chain);
116 /* Check every nat entry... */
117 LIST_FOREACH(ptr, &chain->nat, _next) {
118 struct epoch_tracker et;
119
120 /* ...using nic 'ifp->if_xname' as dynamic alias address. */
121 if (strncmp(ptr->if_name, ifp->if_xname, IF_NAMESIZE) != 0)
122 continue;
123 NET_EPOCH_ENTER(et);
124 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
125 if (ifa->ifa_addr == NULL)
126 continue;
127 if (ifa->ifa_addr->sa_family != AF_INET)
128 continue;
129 IPFW_WLOCK(chain);
130 ptr->ip = ((struct sockaddr_in *)
131 (ifa->ifa_addr))->sin_addr;
132 LibAliasSetAddress(ptr->lib, ptr->ip);
133 IPFW_WUNLOCK(chain);
134 }
135 NET_EPOCH_EXIT(et);
136 }
137 IPFW_UH_WUNLOCK(chain);
138 }
139
140 /*
141 * delete the pointers for nat entry ix, or all of them if ix < 0
142 */
143 static void
flush_nat_ptrs(struct ip_fw_chain * chain,const int ix)144 flush_nat_ptrs(struct ip_fw_chain *chain, const int ix)
145 {
146 ipfw_insn_nat *cmd;
147 int i;
148
149 IPFW_WLOCK_ASSERT(chain);
150 for (i = 0; i < chain->n_rules; i++) {
151 cmd = (ipfw_insn_nat *)ipfw_get_action(chain->map[i]);
152 if (cmd->o.opcode == O_NAT && cmd->nat != NULL &&
153 (ix < 0 || cmd->nat->id == ix))
154 cmd->nat = NULL;
155 }
156 }
157
158 static void
del_redir_spool_cfg(struct cfg_nat * n,struct redir_chain * head)159 del_redir_spool_cfg(struct cfg_nat *n, struct redir_chain *head)
160 {
161 struct cfg_redir *r, *tmp_r;
162 struct cfg_spool *s, *tmp_s;
163 int i, num;
164
165 LIST_FOREACH_SAFE(r, head, _next, tmp_r) {
166 num = 1; /* Number of alias_link to delete. */
167 switch (r->mode) {
168 case NAT44_REDIR_PORT:
169 num = r->pport_cnt;
170 /* FALLTHROUGH */
171 case NAT44_REDIR_ADDR:
172 case NAT44_REDIR_PROTO:
173 /* Delete all libalias redirect entry. */
174 for (i = 0; i < num; i++)
175 LibAliasRedirectDelete(n->lib, r->alink[i]);
176 /* Del spool cfg if any. */
177 LIST_FOREACH_SAFE(s, &r->spool_chain, _next, tmp_s) {
178 LIST_REMOVE(s, _next);
179 free(s, M_IPFW);
180 }
181 free(r->alink, M_IPFW);
182 LIST_REMOVE(r, _next);
183 free(r, M_IPFW);
184 break;
185 default:
186 printf("unknown redirect mode: %u\n", r->mode);
187 /* XXX - panic?!?!? */
188 break;
189 }
190 }
191 }
192
193 static int
add_redir_spool_cfg(char * buf,struct cfg_nat * ptr)194 add_redir_spool_cfg(char *buf, struct cfg_nat *ptr)
195 {
196 struct cfg_redir *r;
197 struct cfg_spool *s;
198 struct nat44_cfg_redir *ser_r;
199 struct nat44_cfg_spool *ser_s;
200
201 int cnt, off, i;
202
203 for (cnt = 0, off = 0; cnt < ptr->redir_cnt; cnt++) {
204 ser_r = (struct nat44_cfg_redir *)&buf[off];
205 r = malloc(sizeof(*r), M_IPFW, M_WAITOK | M_ZERO);
206 r->mode = ser_r->mode;
207 r->laddr = ser_r->laddr;
208 r->paddr = ser_r->paddr;
209 r->raddr = ser_r->raddr;
210 r->lport = ser_r->lport;
211 r->pport = ser_r->pport;
212 r->rport = ser_r->rport;
213 r->pport_cnt = ser_r->pport_cnt;
214 r->rport_cnt = ser_r->rport_cnt;
215 r->proto = ser_r->proto;
216 r->spool_cnt = ser_r->spool_cnt;
217 //memcpy(r, ser_r, SOF_REDIR);
218 LIST_INIT(&r->spool_chain);
219 off += sizeof(struct nat44_cfg_redir);
220 r->alink = malloc(sizeof(struct alias_link *) * r->pport_cnt,
221 M_IPFW, M_WAITOK | M_ZERO);
222 switch (r->mode) {
223 case NAT44_REDIR_ADDR:
224 r->alink[0] = LibAliasRedirectAddr(ptr->lib, r->laddr,
225 r->paddr);
226 break;
227 case NAT44_REDIR_PORT:
228 for (i = 0 ; i < r->pport_cnt; i++) {
229 /* If remotePort is all ports, set it to 0. */
230 u_short remotePortCopy = r->rport + i;
231 if (r->rport_cnt == 1 && r->rport == 0)
232 remotePortCopy = 0;
233 r->alink[i] = LibAliasRedirectPort(ptr->lib,
234 r->laddr, htons(r->lport + i), r->raddr,
235 htons(remotePortCopy), r->paddr,
236 htons(r->pport + i), r->proto);
237 if (r->alink[i] == NULL) {
238 r->alink[0] = NULL;
239 break;
240 }
241 }
242 break;
243 case NAT44_REDIR_PROTO:
244 r->alink[0] = LibAliasRedirectProto(ptr->lib ,r->laddr,
245 r->raddr, r->paddr, r->proto);
246 break;
247 default:
248 printf("unknown redirect mode: %u\n", r->mode);
249 break;
250 }
251 if (r->alink[0] == NULL) {
252 printf("LibAliasRedirect* returned NULL\n");
253 free(r->alink, M_IPFW);
254 free(r, M_IPFW);
255 return (EINVAL);
256 }
257 /* LSNAT handling. */
258 for (i = 0; i < r->spool_cnt; i++) {
259 ser_s = (struct nat44_cfg_spool *)&buf[off];
260 s = malloc(sizeof(*s), M_IPFW, M_WAITOK | M_ZERO);
261 s->addr = ser_s->addr;
262 s->port = ser_s->port;
263 LibAliasAddServer(ptr->lib, r->alink[0],
264 s->addr, htons(s->port));
265 off += sizeof(struct nat44_cfg_spool);
266 /* Hook spool entry. */
267 LIST_INSERT_HEAD(&r->spool_chain, s, _next);
268 }
269 /* And finally hook this redir entry. */
270 LIST_INSERT_HEAD(&ptr->redir_chain, r, _next);
271 }
272
273 return (0);
274 }
275
276 static void
free_nat_instance(struct cfg_nat * ptr)277 free_nat_instance(struct cfg_nat *ptr)
278 {
279
280 del_redir_spool_cfg(ptr, &ptr->redir_chain);
281 LibAliasUninit(ptr->lib);
282 free(ptr, M_IPFW);
283 }
284
285 /*
286 * ipfw_nat - perform mbuf header translation.
287 *
288 * Note V_layer3_chain has to be locked while calling ipfw_nat() in
289 * 'global' operation mode (t == NULL).
290 *
291 */
292 static int
ipfw_nat(struct ip_fw_args * args,struct cfg_nat * t,struct mbuf * m)293 ipfw_nat(struct ip_fw_args *args, struct cfg_nat *t, struct mbuf *m)
294 {
295 struct mbuf *mcl;
296 struct ip *ip;
297 /* XXX - libalias duct tape */
298 int ldt, retval, found;
299 struct ip_fw_chain *chain;
300 char *c;
301
302 ldt = 0;
303 retval = 0;
304 mcl = m_megapullup(m, m->m_pkthdr.len);
305 if (mcl == NULL) {
306 args->m = NULL;
307 return (IP_FW_DENY);
308 }
309 M_ASSERTMAPPED(mcl);
310 ip = mtod(mcl, struct ip *);
311
312 /*
313 * XXX - Libalias checksum offload 'duct tape':
314 *
315 * locally generated packets have only pseudo-header checksum
316 * calculated and libalias will break it[1], so mark them for
317 * later fix. Moreover there are cases when libalias modifies
318 * tcp packet data[2], mark them for later fix too.
319 *
320 * [1] libalias was never meant to run in kernel, so it does
321 * not have any knowledge about checksum offloading, and
322 * expects a packet with a full internet checksum.
323 * Unfortunately, packets generated locally will have just the
324 * pseudo header calculated, and when libalias tries to adjust
325 * the checksum it will actually compute a wrong value.
326 *
327 * [2] when libalias modifies tcp's data content, full TCP
328 * checksum has to be recomputed: the problem is that
329 * libalias does not have any idea about checksum offloading.
330 * To work around this, we do not do checksumming in LibAlias,
331 * but only mark the packets in th_x2 field. If we receive a
332 * marked packet, we calculate correct checksum for it
333 * aware of offloading. Why such a terrible hack instead of
334 * recalculating checksum for each packet?
335 * Because the previous checksum was not checked!
336 * Recalculating checksums for EVERY packet will hide ALL
337 * transmission errors. Yes, marked packets still suffer from
338 * this problem. But, sigh, natd(8) has this problem, too.
339 *
340 * TODO: -make libalias mbuf aware (so
341 * it can handle delayed checksum and tso)
342 */
343
344 if (mcl->m_pkthdr.rcvif == NULL &&
345 mcl->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
346 ldt = 1;
347
348 c = mtod(mcl, char *);
349
350 /* Check if this is 'global' instance */
351 if (t == NULL) {
352 if (args->flags & IPFW_ARGS_IN) {
353 /* Wrong direction, skip processing */
354 args->m = mcl;
355 return (IP_FW_NAT);
356 }
357
358 found = 0;
359 chain = &V_layer3_chain;
360 IPFW_RLOCK_ASSERT(chain);
361 /* Check every nat entry... */
362 LIST_FOREACH(t, &chain->nat, _next) {
363 if ((t->mode & PKT_ALIAS_SKIP_GLOBAL) != 0)
364 continue;
365 retval = LibAliasOutTry(t->lib, c,
366 mcl->m_len + M_TRAILINGSPACE(mcl), 0);
367 if (retval == PKT_ALIAS_OK) {
368 /* Nat instance recognises state */
369 found = 1;
370 break;
371 }
372 }
373 if (found != 1) {
374 /* No instance found, return ignore */
375 args->m = mcl;
376 return (IP_FW_NAT);
377 }
378 } else {
379 if (args->flags & IPFW_ARGS_IN)
380 retval = LibAliasIn(t->lib, c,
381 mcl->m_len + M_TRAILINGSPACE(mcl));
382 else
383 retval = LibAliasOut(t->lib, c,
384 mcl->m_len + M_TRAILINGSPACE(mcl));
385 }
386
387 /*
388 * We drop packet when:
389 * 1. libalias returns PKT_ALIAS_ERROR;
390 * 2. For incoming packets:
391 * a) for unresolved fragments;
392 * b) libalias returns PKT_ALIAS_IGNORED and
393 * PKT_ALIAS_DENY_INCOMING flag is set.
394 */
395 if (retval == PKT_ALIAS_ERROR ||
396 ((args->flags & IPFW_ARGS_IN) &&
397 (retval == PKT_ALIAS_UNRESOLVED_FRAGMENT ||
398 (retval == PKT_ALIAS_IGNORED &&
399 (t->mode & PKT_ALIAS_DENY_INCOMING) != 0)))) {
400 /* XXX - should i add some logging? */
401 m_free(mcl);
402 args->m = NULL;
403 return (IP_FW_DENY);
404 }
405
406 if (retval == PKT_ALIAS_RESPOND)
407 mcl->m_flags |= M_SKIP_FIREWALL;
408 mcl->m_pkthdr.len = mcl->m_len = ntohs(ip->ip_len);
409
410 /*
411 * XXX - libalias checksum offload
412 * 'duct tape' (see above)
413 */
414
415 if ((ip->ip_off & htons(IP_OFFMASK)) == 0 &&
416 ip->ip_p == IPPROTO_TCP) {
417 struct tcphdr *th;
418
419 th = (struct tcphdr *)(ip + 1);
420 if (th->th_x2 & (TH_RES1 >> 8))
421 ldt = 1;
422 }
423
424 if (ldt) {
425 struct tcphdr *th;
426 struct udphdr *uh;
427 uint16_t ip_len, cksum;
428
429 ip_len = ntohs(ip->ip_len);
430 cksum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
431 htons(ip->ip_p + ip_len - (ip->ip_hl << 2)));
432
433 switch (ip->ip_p) {
434 case IPPROTO_TCP:
435 th = (struct tcphdr *)(ip + 1);
436 /*
437 * Maybe it was set in
438 * libalias...
439 */
440 th->th_x2 &= ~(TH_RES1 >> 8);
441 th->th_sum = cksum;
442 mcl->m_pkthdr.csum_data =
443 offsetof(struct tcphdr, th_sum);
444 break;
445 case IPPROTO_UDP:
446 uh = (struct udphdr *)(ip + 1);
447 uh->uh_sum = cksum;
448 mcl->m_pkthdr.csum_data =
449 offsetof(struct udphdr, uh_sum);
450 break;
451 }
452 /* No hw checksum offloading: do it ourselves */
453 if ((mcl->m_pkthdr.csum_flags & CSUM_DELAY_DATA) == 0) {
454 in_delayed_cksum(mcl);
455 mcl->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
456 }
457 }
458 args->m = mcl;
459 return (IP_FW_NAT);
460 }
461
462 static struct cfg_nat *
lookup_nat(struct nat_list * l,int nat_id)463 lookup_nat(struct nat_list *l, int nat_id)
464 {
465 struct cfg_nat *res;
466
467 LIST_FOREACH(res, l, _next) {
468 if (res->id == nat_id)
469 break;
470 }
471 return res;
472 }
473
474 static struct cfg_nat *
lookup_nat_name(struct nat_list * l,char * name)475 lookup_nat_name(struct nat_list *l, char *name)
476 {
477 struct cfg_nat *res;
478 int id;
479 char *errptr;
480
481 id = strtol(name, &errptr, 10);
482 if (id == 0 || *errptr != '\0')
483 return (NULL);
484
485 LIST_FOREACH(res, l, _next) {
486 if (res->id == id)
487 break;
488 }
489 return (res);
490 }
491
492 /* IP_FW3 configuration routines */
493
494 static void
nat44_config(struct ip_fw_chain * chain,struct nat44_cfg_nat * ucfg)495 nat44_config(struct ip_fw_chain *chain, struct nat44_cfg_nat *ucfg)
496 {
497 struct cfg_nat *ptr, *tcfg;
498 int gencnt;
499
500 /*
501 * Find/create nat rule.
502 */
503 IPFW_UH_WLOCK(chain);
504 gencnt = chain->gencnt;
505 ptr = lookup_nat_name(&chain->nat, ucfg->name);
506 if (ptr == NULL) {
507 IPFW_UH_WUNLOCK(chain);
508 /* New rule: allocate and init new instance. */
509 ptr = malloc(sizeof(struct cfg_nat), M_IPFW, M_WAITOK | M_ZERO);
510 ptr->lib = LibAliasInit(NULL);
511 LIST_INIT(&ptr->redir_chain);
512 } else {
513 /* Entry already present: temporarily unhook it. */
514 IPFW_WLOCK(chain);
515 LIST_REMOVE(ptr, _next);
516 flush_nat_ptrs(chain, ptr->id);
517 IPFW_WUNLOCK(chain);
518 IPFW_UH_WUNLOCK(chain);
519 }
520
521 /*
522 * Basic nat (re)configuration.
523 */
524 ptr->id = strtol(ucfg->name, NULL, 10);
525 /*
526 * XXX - what if this rule doesn't nat any ip and just
527 * redirect?
528 * do we set aliasaddress to 0.0.0.0?
529 */
530 ptr->ip = ucfg->ip;
531 ptr->redir_cnt = ucfg->redir_cnt;
532 ptr->mode = ucfg->mode;
533 ptr->alias_port_lo = ucfg->alias_port_lo;
534 ptr->alias_port_hi = ucfg->alias_port_hi;
535 strlcpy(ptr->if_name, ucfg->if_name, sizeof(ptr->if_name));
536 LibAliasSetMode(ptr->lib, ptr->mode, ~0);
537 LibAliasSetAddress(ptr->lib, ptr->ip);
538 LibAliasSetAliasPortRange(ptr->lib, ptr->alias_port_lo, ptr->alias_port_hi);
539
540 /*
541 * Redir and LSNAT configuration.
542 */
543 /* Delete old cfgs. */
544 del_redir_spool_cfg(ptr, &ptr->redir_chain);
545 /* Add new entries. */
546 add_redir_spool_cfg((char *)(ucfg + 1), ptr);
547 IPFW_UH_WLOCK(chain);
548
549 /* Extra check to avoid race with another ipfw_nat_cfg() */
550 tcfg = NULL;
551 if (gencnt != chain->gencnt)
552 tcfg = lookup_nat_name(&chain->nat, ucfg->name);
553 IPFW_WLOCK(chain);
554 if (tcfg != NULL)
555 LIST_REMOVE(tcfg, _next);
556 LIST_INSERT_HEAD(&chain->nat, ptr, _next);
557 IPFW_WUNLOCK(chain);
558 chain->gencnt++;
559
560 IPFW_UH_WUNLOCK(chain);
561
562 if (tcfg != NULL)
563 free_nat_instance(ptr);
564 }
565
566 /*
567 * Creates/configure nat44 instance
568 * Data layout (v0)(current):
569 * Request: [ ipfw_obj_header nat44_cfg_nat .. ]
570 *
571 * Returns 0 on success
572 */
573 static int
nat44_cfg(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)574 nat44_cfg(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
575 struct sockopt_data *sd)
576 {
577 ipfw_obj_header *oh;
578 struct nat44_cfg_nat *ucfg;
579 int id;
580 size_t read;
581 char *errptr;
582
583 /* Check minimum header size */
584 if (sd->valsize < (sizeof(*oh) + sizeof(*ucfg)))
585 return (EINVAL);
586
587 oh = (ipfw_obj_header *)sd->kbuf;
588
589 /* Basic length checks for TLVs */
590 if (oh->ntlv.head.length != sizeof(oh->ntlv))
591 return (EINVAL);
592
593 ucfg = (struct nat44_cfg_nat *)(oh + 1);
594
595 /* Check if name is properly terminated and looks like number */
596 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
597 return (EINVAL);
598 id = strtol(ucfg->name, &errptr, 10);
599 if (id == 0 || *errptr != '\0')
600 return (EINVAL);
601
602 read = sizeof(*oh) + sizeof(*ucfg);
603 /* Check number of redirs */
604 if (sd->valsize < read + ucfg->redir_cnt*sizeof(struct nat44_cfg_redir))
605 return (EINVAL);
606
607 nat44_config(chain, ucfg);
608 return (0);
609 }
610
611 /*
612 * Destroys given nat instances.
613 * Data layout (v0)(current):
614 * Request: [ ipfw_obj_header ]
615 *
616 * Returns 0 on success
617 */
618 static int
nat44_destroy(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)619 nat44_destroy(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
620 struct sockopt_data *sd)
621 {
622 ipfw_obj_header *oh;
623 struct cfg_nat *ptr;
624 ipfw_obj_ntlv *ntlv;
625
626 /* Check minimum header size */
627 if (sd->valsize < sizeof(*oh))
628 return (EINVAL);
629
630 oh = (ipfw_obj_header *)sd->kbuf;
631
632 /* Basic length checks for TLVs */
633 if (oh->ntlv.head.length != sizeof(oh->ntlv))
634 return (EINVAL);
635
636 ntlv = &oh->ntlv;
637 /* Check if name is properly terminated */
638 if (strnlen(ntlv->name, sizeof(ntlv->name)) == sizeof(ntlv->name))
639 return (EINVAL);
640
641 IPFW_UH_WLOCK(chain);
642 ptr = lookup_nat_name(&chain->nat, ntlv->name);
643 if (ptr == NULL) {
644 IPFW_UH_WUNLOCK(chain);
645 return (ESRCH);
646 }
647 IPFW_WLOCK(chain);
648 LIST_REMOVE(ptr, _next);
649 flush_nat_ptrs(chain, ptr->id);
650 IPFW_WUNLOCK(chain);
651 IPFW_UH_WUNLOCK(chain);
652
653 free_nat_instance(ptr);
654
655 return (0);
656 }
657
658 static void
export_nat_cfg(struct cfg_nat * ptr,struct nat44_cfg_nat * ucfg)659 export_nat_cfg(struct cfg_nat *ptr, struct nat44_cfg_nat *ucfg)
660 {
661
662 snprintf(ucfg->name, sizeof(ucfg->name), "%d", ptr->id);
663 ucfg->ip = ptr->ip;
664 ucfg->redir_cnt = ptr->redir_cnt;
665 ucfg->mode = ptr->mode;
666 ucfg->alias_port_lo = ptr->alias_port_lo;
667 ucfg->alias_port_hi = ptr->alias_port_hi;
668 strlcpy(ucfg->if_name, ptr->if_name, sizeof(ucfg->if_name));
669 }
670
671 /*
672 * Gets config for given nat instance
673 * Data layout (v0)(current):
674 * Request: [ ipfw_obj_header nat44_cfg_nat .. ]
675 *
676 * Returns 0 on success
677 */
678 static int
nat44_get_cfg(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)679 nat44_get_cfg(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
680 struct sockopt_data *sd)
681 {
682 ipfw_obj_header *oh;
683 struct nat44_cfg_nat *ucfg;
684 struct cfg_nat *ptr;
685 struct cfg_redir *r;
686 struct cfg_spool *s;
687 struct nat44_cfg_redir *ser_r;
688 struct nat44_cfg_spool *ser_s;
689 size_t sz;
690
691 sz = sizeof(*oh) + sizeof(*ucfg);
692 /* Check minimum header size */
693 if (sd->valsize < sz)
694 return (EINVAL);
695
696 oh = (struct _ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
697
698 /* Basic length checks for TLVs */
699 if (oh->ntlv.head.length != sizeof(oh->ntlv))
700 return (EINVAL);
701
702 ucfg = (struct nat44_cfg_nat *)(oh + 1);
703
704 /* Check if name is properly terminated */
705 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
706 return (EINVAL);
707
708 IPFW_UH_RLOCK(chain);
709 ptr = lookup_nat_name(&chain->nat, ucfg->name);
710 if (ptr == NULL) {
711 IPFW_UH_RUNLOCK(chain);
712 return (ESRCH);
713 }
714
715 export_nat_cfg(ptr, ucfg);
716
717 /* Estimate memory amount */
718 sz = sizeof(ipfw_obj_header) + sizeof(struct nat44_cfg_nat);
719 LIST_FOREACH(r, &ptr->redir_chain, _next) {
720 sz += sizeof(struct nat44_cfg_redir);
721 LIST_FOREACH(s, &r->spool_chain, _next)
722 sz += sizeof(struct nat44_cfg_spool);
723 }
724
725 ucfg->size = sz;
726 if (sd->valsize < sz) {
727 /*
728 * Submitted buffer size is not enough.
729 * WE've already filled in @ucfg structure with
730 * relevant info including size, so we
731 * can return. Buffer will be flushed automatically.
732 */
733 IPFW_UH_RUNLOCK(chain);
734 return (ENOMEM);
735 }
736
737 /* Size OK, let's copy data */
738 LIST_FOREACH(r, &ptr->redir_chain, _next) {
739 ser_r = (struct nat44_cfg_redir *)ipfw_get_sopt_space(sd,
740 sizeof(*ser_r));
741 ser_r->mode = r->mode;
742 ser_r->laddr = r->laddr;
743 ser_r->paddr = r->paddr;
744 ser_r->raddr = r->raddr;
745 ser_r->lport = r->lport;
746 ser_r->pport = r->pport;
747 ser_r->rport = r->rport;
748 ser_r->pport_cnt = r->pport_cnt;
749 ser_r->rport_cnt = r->rport_cnt;
750 ser_r->proto = r->proto;
751 ser_r->spool_cnt = r->spool_cnt;
752
753 LIST_FOREACH(s, &r->spool_chain, _next) {
754 ser_s = (struct nat44_cfg_spool *)ipfw_get_sopt_space(
755 sd, sizeof(*ser_s));
756
757 ser_s->addr = s->addr;
758 ser_s->port = s->port;
759 }
760 }
761
762 IPFW_UH_RUNLOCK(chain);
763
764 return (0);
765 }
766
767 /*
768 * Lists all nat44 instances currently available in kernel.
769 * Data layout (v0)(current):
770 * Request: [ ipfw_obj_lheader ]
771 * Reply: [ ipfw_obj_lheader nat44_cfg_nat x N ]
772 *
773 * Returns 0 on success
774 */
775 static int
nat44_list_nat(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)776 nat44_list_nat(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
777 struct sockopt_data *sd)
778 {
779 ipfw_obj_lheader *olh;
780 struct nat44_cfg_nat *ucfg;
781 struct cfg_nat *ptr;
782 int nat_count;
783
784 /* Check minimum header size */
785 if (sd->valsize < sizeof(ipfw_obj_lheader))
786 return (EINVAL);
787
788 olh = (ipfw_obj_lheader *)ipfw_get_sopt_header(sd, sizeof(*olh));
789 IPFW_UH_RLOCK(chain);
790 nat_count = 0;
791 LIST_FOREACH(ptr, &chain->nat, _next)
792 nat_count++;
793
794 olh->count = nat_count;
795 olh->objsize = sizeof(struct nat44_cfg_nat);
796 olh->size = sizeof(*olh) + olh->count * olh->objsize;
797
798 if (sd->valsize < olh->size) {
799 IPFW_UH_RUNLOCK(chain);
800 return (ENOMEM);
801 }
802
803 LIST_FOREACH(ptr, &chain->nat, _next) {
804 ucfg = (struct nat44_cfg_nat *)ipfw_get_sopt_space(sd,
805 sizeof(*ucfg));
806 export_nat_cfg(ptr, ucfg);
807 }
808
809 IPFW_UH_RUNLOCK(chain);
810
811 return (0);
812 }
813
814 /*
815 * Gets log for given nat instance
816 * Data layout (v0)(current):
817 * Request: [ ipfw_obj_header nat44_cfg_nat ]
818 * Reply: [ ipfw_obj_header nat44_cfg_nat LOGBUFFER ]
819 *
820 * Returns 0 on success
821 */
822 static int
nat44_get_log(struct ip_fw_chain * chain,ip_fw3_opheader * op3,struct sockopt_data * sd)823 nat44_get_log(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
824 struct sockopt_data *sd)
825 {
826 ipfw_obj_header *oh;
827 struct nat44_cfg_nat *ucfg;
828 struct cfg_nat *ptr;
829 void *pbuf;
830 size_t sz;
831
832 sz = sizeof(*oh) + sizeof(*ucfg);
833 /* Check minimum header size */
834 if (sd->valsize < sz)
835 return (EINVAL);
836
837 oh = (struct _ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
838
839 /* Basic length checks for TLVs */
840 if (oh->ntlv.head.length != sizeof(oh->ntlv))
841 return (EINVAL);
842
843 ucfg = (struct nat44_cfg_nat *)(oh + 1);
844
845 /* Check if name is properly terminated */
846 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
847 return (EINVAL);
848
849 IPFW_UH_RLOCK(chain);
850 ptr = lookup_nat_name(&chain->nat, ucfg->name);
851 if (ptr == NULL) {
852 IPFW_UH_RUNLOCK(chain);
853 return (ESRCH);
854 }
855
856 if (ptr->lib->logDesc == NULL) {
857 IPFW_UH_RUNLOCK(chain);
858 return (ENOENT);
859 }
860
861 export_nat_cfg(ptr, ucfg);
862
863 /* Estimate memory amount */
864 ucfg->size = sizeof(struct nat44_cfg_nat) + LIBALIAS_BUF_SIZE;
865 if (sd->valsize < sz + sizeof(*oh)) {
866 /*
867 * Submitted buffer size is not enough.
868 * WE've already filled in @ucfg structure with
869 * relevant info including size, so we
870 * can return. Buffer will be flushed automatically.
871 */
872 IPFW_UH_RUNLOCK(chain);
873 return (ENOMEM);
874 }
875
876 pbuf = (void *)ipfw_get_sopt_space(sd, LIBALIAS_BUF_SIZE);
877 memcpy(pbuf, ptr->lib->logDesc, LIBALIAS_BUF_SIZE);
878
879 IPFW_UH_RUNLOCK(chain);
880
881 return (0);
882 }
883
884 static struct ipfw_sopt_handler scodes[] = {
885 { IP_FW_NAT44_XCONFIG, 0, HDIR_SET, nat44_cfg },
886 { IP_FW_NAT44_DESTROY, 0, HDIR_SET, nat44_destroy },
887 { IP_FW_NAT44_XGETCONFIG, 0, HDIR_GET, nat44_get_cfg },
888 { IP_FW_NAT44_LIST_NAT, 0, HDIR_GET, nat44_list_nat },
889 { IP_FW_NAT44_XGETLOG, 0, HDIR_GET, nat44_get_log },
890 };
891
892 /*
893 * Legacy configuration routines
894 */
895
896 struct cfg_spool_legacy {
897 LIST_ENTRY(cfg_spool_legacy) _next;
898 struct in_addr addr;
899 u_short port;
900 };
901
902 struct cfg_redir_legacy {
903 LIST_ENTRY(cfg_redir) _next;
904 u_int16_t mode;
905 struct in_addr laddr;
906 struct in_addr paddr;
907 struct in_addr raddr;
908 u_short lport;
909 u_short pport;
910 u_short rport;
911 u_short pport_cnt;
912 u_short rport_cnt;
913 int proto;
914 struct alias_link **alink;
915 u_int16_t spool_cnt;
916 LIST_HEAD(, cfg_spool_legacy) spool_chain;
917 };
918
919 struct cfg_nat_legacy {
920 LIST_ENTRY(cfg_nat_legacy) _next;
921 int id;
922 struct in_addr ip;
923 char if_name[IF_NAMESIZE];
924 int mode;
925 struct libalias *lib;
926 int redir_cnt;
927 LIST_HEAD(, cfg_redir_legacy) redir_chain;
928 };
929
930 static int
ipfw_nat_cfg(struct sockopt * sopt)931 ipfw_nat_cfg(struct sockopt *sopt)
932 {
933 struct cfg_nat_legacy *cfg;
934 struct nat44_cfg_nat *ucfg;
935 struct cfg_redir_legacy *rdir;
936 struct nat44_cfg_redir *urdir;
937 char *buf;
938 size_t len, len2;
939 int error, i;
940
941 len = sopt->sopt_valsize;
942 len2 = len + 128;
943
944 /*
945 * Allocate 2x buffer to store converted structures.
946 * new redir_cfg has shrunk, so we're sure that
947 * new buffer size is enough.
948 */
949 buf = malloc(roundup2(len, 8) + len2, M_TEMP, M_WAITOK | M_ZERO);
950 error = sooptcopyin(sopt, buf, len, sizeof(struct cfg_nat_legacy));
951 if (error != 0)
952 goto out;
953
954 cfg = (struct cfg_nat_legacy *)buf;
955 if (cfg->id < 0) {
956 error = EINVAL;
957 goto out;
958 }
959
960 ucfg = (struct nat44_cfg_nat *)&buf[roundup2(len, 8)];
961 snprintf(ucfg->name, sizeof(ucfg->name), "%d", cfg->id);
962 strlcpy(ucfg->if_name, cfg->if_name, sizeof(ucfg->if_name));
963 ucfg->ip = cfg->ip;
964 ucfg->mode = cfg->mode;
965 ucfg->redir_cnt = cfg->redir_cnt;
966
967 if (len < sizeof(*cfg) + cfg->redir_cnt * sizeof(*rdir)) {
968 error = EINVAL;
969 goto out;
970 }
971
972 urdir = (struct nat44_cfg_redir *)(ucfg + 1);
973 rdir = (struct cfg_redir_legacy *)(cfg + 1);
974 for (i = 0; i < cfg->redir_cnt; i++) {
975 urdir->mode = rdir->mode;
976 urdir->laddr = rdir->laddr;
977 urdir->paddr = rdir->paddr;
978 urdir->raddr = rdir->raddr;
979 urdir->lport = rdir->lport;
980 urdir->pport = rdir->pport;
981 urdir->rport = rdir->rport;
982 urdir->pport_cnt = rdir->pport_cnt;
983 urdir->rport_cnt = rdir->rport_cnt;
984 urdir->proto = rdir->proto;
985 urdir->spool_cnt = rdir->spool_cnt;
986
987 urdir++;
988 rdir++;
989 }
990
991 nat44_config(&V_layer3_chain, ucfg);
992
993 out:
994 free(buf, M_TEMP);
995 return (error);
996 }
997
998 static int
ipfw_nat_del(struct sockopt * sopt)999 ipfw_nat_del(struct sockopt *sopt)
1000 {
1001 struct cfg_nat *ptr;
1002 struct ip_fw_chain *chain = &V_layer3_chain;
1003 int i;
1004
1005 sooptcopyin(sopt, &i, sizeof i, sizeof i);
1006 /* XXX validate i */
1007 IPFW_UH_WLOCK(chain);
1008 ptr = lookup_nat(&chain->nat, i);
1009 if (ptr == NULL) {
1010 IPFW_UH_WUNLOCK(chain);
1011 return (EINVAL);
1012 }
1013 IPFW_WLOCK(chain);
1014 LIST_REMOVE(ptr, _next);
1015 flush_nat_ptrs(chain, i);
1016 IPFW_WUNLOCK(chain);
1017 IPFW_UH_WUNLOCK(chain);
1018 free_nat_instance(ptr);
1019 return (0);
1020 }
1021
1022 static int
ipfw_nat_get_cfg(struct sockopt * sopt)1023 ipfw_nat_get_cfg(struct sockopt *sopt)
1024 {
1025 struct ip_fw_chain *chain = &V_layer3_chain;
1026 struct cfg_nat *n;
1027 struct cfg_nat_legacy *ucfg;
1028 struct cfg_redir *r;
1029 struct cfg_spool *s;
1030 struct cfg_redir_legacy *ser_r;
1031 struct cfg_spool_legacy *ser_s;
1032 char *data;
1033 int gencnt, nat_cnt, len, error;
1034
1035 nat_cnt = 0;
1036 len = sizeof(nat_cnt);
1037
1038 IPFW_UH_RLOCK(chain);
1039 retry:
1040 gencnt = chain->gencnt;
1041 /* Estimate memory amount */
1042 LIST_FOREACH(n, &chain->nat, _next) {
1043 nat_cnt++;
1044 len += sizeof(struct cfg_nat_legacy);
1045 LIST_FOREACH(r, &n->redir_chain, _next) {
1046 len += sizeof(struct cfg_redir_legacy);
1047 LIST_FOREACH(s, &r->spool_chain, _next)
1048 len += sizeof(struct cfg_spool_legacy);
1049 }
1050 }
1051 IPFW_UH_RUNLOCK(chain);
1052
1053 data = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
1054 bcopy(&nat_cnt, data, sizeof(nat_cnt));
1055
1056 nat_cnt = 0;
1057 len = sizeof(nat_cnt);
1058
1059 IPFW_UH_RLOCK(chain);
1060 if (gencnt != chain->gencnt) {
1061 free(data, M_TEMP);
1062 goto retry;
1063 }
1064 /* Serialize all the data. */
1065 LIST_FOREACH(n, &chain->nat, _next) {
1066 ucfg = (struct cfg_nat_legacy *)&data[len];
1067 ucfg->id = n->id;
1068 ucfg->ip = n->ip;
1069 ucfg->redir_cnt = n->redir_cnt;
1070 ucfg->mode = n->mode;
1071 strlcpy(ucfg->if_name, n->if_name, sizeof(ucfg->if_name));
1072 len += sizeof(struct cfg_nat_legacy);
1073 LIST_FOREACH(r, &n->redir_chain, _next) {
1074 ser_r = (struct cfg_redir_legacy *)&data[len];
1075 ser_r->mode = r->mode;
1076 ser_r->laddr = r->laddr;
1077 ser_r->paddr = r->paddr;
1078 ser_r->raddr = r->raddr;
1079 ser_r->lport = r->lport;
1080 ser_r->pport = r->pport;
1081 ser_r->rport = r->rport;
1082 ser_r->pport_cnt = r->pport_cnt;
1083 ser_r->rport_cnt = r->rport_cnt;
1084 ser_r->proto = r->proto;
1085 ser_r->spool_cnt = r->spool_cnt;
1086 len += sizeof(struct cfg_redir_legacy);
1087 LIST_FOREACH(s, &r->spool_chain, _next) {
1088 ser_s = (struct cfg_spool_legacy *)&data[len];
1089 ser_s->addr = s->addr;
1090 ser_s->port = s->port;
1091 len += sizeof(struct cfg_spool_legacy);
1092 }
1093 }
1094 }
1095 IPFW_UH_RUNLOCK(chain);
1096
1097 error = sooptcopyout(sopt, data, len);
1098 free(data, M_TEMP);
1099
1100 return (error);
1101 }
1102
1103 static int
ipfw_nat_get_log(struct sockopt * sopt)1104 ipfw_nat_get_log(struct sockopt *sopt)
1105 {
1106 uint8_t *data;
1107 struct cfg_nat *ptr;
1108 int i, size;
1109 struct ip_fw_chain *chain;
1110 IPFW_RLOCK_TRACKER;
1111
1112 chain = &V_layer3_chain;
1113
1114 IPFW_RLOCK(chain);
1115 /* one pass to count, one to copy the data */
1116 i = 0;
1117 LIST_FOREACH(ptr, &chain->nat, _next) {
1118 if (ptr->lib->logDesc == NULL)
1119 continue;
1120 i++;
1121 }
1122 size = i * (LIBALIAS_BUF_SIZE + sizeof(int));
1123 data = malloc(size, M_IPFW, M_NOWAIT | M_ZERO);
1124 if (data == NULL) {
1125 IPFW_RUNLOCK(chain);
1126 return (ENOSPC);
1127 }
1128 i = 0;
1129 LIST_FOREACH(ptr, &chain->nat, _next) {
1130 if (ptr->lib->logDesc == NULL)
1131 continue;
1132 bcopy(&ptr->id, &data[i], sizeof(int));
1133 i += sizeof(int);
1134 bcopy(ptr->lib->logDesc, &data[i], LIBALIAS_BUF_SIZE);
1135 i += LIBALIAS_BUF_SIZE;
1136 }
1137 IPFW_RUNLOCK(chain);
1138 sooptcopyout(sopt, data, size);
1139 free(data, M_IPFW);
1140 return(0);
1141 }
1142
1143 static int
vnet_ipfw_nat_init(const void * arg __unused)1144 vnet_ipfw_nat_init(const void *arg __unused)
1145 {
1146
1147 V_ipfw_nat_ready = 1;
1148 return (0);
1149 }
1150
1151 static int
vnet_ipfw_nat_uninit(const void * arg __unused)1152 vnet_ipfw_nat_uninit(const void *arg __unused)
1153 {
1154 struct cfg_nat *ptr, *ptr_temp;
1155 struct ip_fw_chain *chain;
1156
1157 chain = &V_layer3_chain;
1158 IPFW_WLOCK(chain);
1159 V_ipfw_nat_ready = 0;
1160 LIST_FOREACH_SAFE(ptr, &chain->nat, _next, ptr_temp) {
1161 LIST_REMOVE(ptr, _next);
1162 free_nat_instance(ptr);
1163 }
1164 flush_nat_ptrs(chain, -1 /* flush all */);
1165 IPFW_WUNLOCK(chain);
1166 return (0);
1167 }
1168
1169 static void
ipfw_nat_init(void)1170 ipfw_nat_init(void)
1171 {
1172
1173 /* init ipfw hooks */
1174 ipfw_nat_ptr = ipfw_nat;
1175 lookup_nat_ptr = lookup_nat;
1176 ipfw_nat_cfg_ptr = ipfw_nat_cfg;
1177 ipfw_nat_del_ptr = ipfw_nat_del;
1178 ipfw_nat_get_cfg_ptr = ipfw_nat_get_cfg;
1179 ipfw_nat_get_log_ptr = ipfw_nat_get_log;
1180 IPFW_ADD_SOPT_HANDLER(1, scodes);
1181
1182 ifaddr_event_tag = EVENTHANDLER_REGISTER(ifaddr_event, ifaddr_change,
1183 NULL, EVENTHANDLER_PRI_ANY);
1184 }
1185
1186 static void
ipfw_nat_destroy(void)1187 ipfw_nat_destroy(void)
1188 {
1189
1190 EVENTHANDLER_DEREGISTER(ifaddr_event, ifaddr_event_tag);
1191 /* deregister ipfw_nat */
1192 IPFW_DEL_SOPT_HANDLER(1, scodes);
1193 ipfw_nat_ptr = NULL;
1194 lookup_nat_ptr = NULL;
1195 ipfw_nat_cfg_ptr = NULL;
1196 ipfw_nat_del_ptr = NULL;
1197 ipfw_nat_get_cfg_ptr = NULL;
1198 ipfw_nat_get_log_ptr = NULL;
1199 }
1200
1201 static int
ipfw_nat_modevent(module_t mod,int type,void * unused)1202 ipfw_nat_modevent(module_t mod, int type, void *unused)
1203 {
1204 int err = 0;
1205
1206 switch (type) {
1207 case MOD_LOAD:
1208 break;
1209
1210 case MOD_UNLOAD:
1211 break;
1212
1213 default:
1214 return EOPNOTSUPP;
1215 break;
1216 }
1217 return err;
1218 }
1219
1220 static moduledata_t ipfw_nat_mod = {
1221 "ipfw_nat",
1222 ipfw_nat_modevent,
1223 0
1224 };
1225
1226 /* Define startup order. */
1227 #define IPFW_NAT_SI_SUB_FIREWALL SI_SUB_PROTO_FIREWALL
1228 #define IPFW_NAT_MODEVENT_ORDER (SI_ORDER_ANY - 128) /* after ipfw */
1229 #define IPFW_NAT_MODULE_ORDER (IPFW_NAT_MODEVENT_ORDER + 1)
1230 #define IPFW_NAT_VNET_ORDER (IPFW_NAT_MODEVENT_ORDER + 2)
1231
1232 DECLARE_MODULE(ipfw_nat, ipfw_nat_mod, IPFW_NAT_SI_SUB_FIREWALL, SI_ORDER_ANY);
1233 MODULE_DEPEND(ipfw_nat, libalias, 1, 1, 1);
1234 MODULE_DEPEND(ipfw_nat, ipfw, 3, 3, 3);
1235 MODULE_VERSION(ipfw_nat, 1);
1236
1237 SYSINIT(ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
1238 ipfw_nat_init, NULL);
1239 VNET_SYSINIT(vnet_ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_VNET_ORDER,
1240 vnet_ipfw_nat_init, NULL);
1241
1242 SYSUNINIT(ipfw_nat_destroy, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
1243 ipfw_nat_destroy, NULL);
1244 VNET_SYSUNINIT(vnet_ipfw_nat_uninit, IPFW_NAT_SI_SUB_FIREWALL,
1245 IPFW_NAT_VNET_ORDER, vnet_ipfw_nat_uninit, NULL);
1246
1247 /* end of file */
1248