2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2008 Paolo Pisati
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/eventhandler.h>
35 #include <sys/malloc.h>
37 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/rwlock.h>
41 #include <sys/rmlock.h>
43 #include <netinet/libalias/alias.h>
44 #include <netinet/libalias/alias_local.h>
47 #include <net/if_var.h>
48 #include <netinet/in.h>
49 #include <netinet/ip.h>
50 #include <netinet/ip_var.h>
51 #include <netinet/ip_fw.h>
52 #include <netinet/tcp.h>
53 #include <netinet/udp.h>
55 #include <netpfil/ipfw/ip_fw_private.h>
57 #include <machine/in_cksum.h> /* XXX for in_cksum */
60 LIST_ENTRY(cfg_spool) _next; /* chain of spool instances */
65 /* Nat redirect configuration. */
67 LIST_ENTRY(cfg_redir) _next; /* chain of redir instances */
68 uint16_t mode; /* type of redirect mode */
69 uint16_t proto; /* protocol: tcp/udp */
70 struct in_addr laddr; /* local ip address */
71 struct in_addr paddr; /* public ip address */
72 struct in_addr raddr; /* remote ip address */
73 uint16_t lport; /* local port */
74 uint16_t pport; /* public port */
75 uint16_t rport; /* remote port */
76 uint16_t pport_cnt; /* number of public ports */
77 uint16_t rport_cnt; /* number of remote ports */
78 struct alias_link **alink;
79 u_int16_t spool_cnt; /* num of entry in spool chain */
80 /* chain of spool instances */
81 LIST_HEAD(spool_chain, cfg_spool) spool_chain;
84 /* Nat configuration data struct. */
86 /* chain of nat instances */
87 LIST_ENTRY(cfg_nat) _next;
89 struct in_addr ip; /* nat ip address */
90 struct libalias *lib; /* libalias instance */
91 int mode; /* aliasing mode */
92 int redir_cnt; /* number of entry in spool chain */
93 /* chain of redir instances */
94 LIST_HEAD(redir_chain, cfg_redir) redir_chain;
95 char if_name[IF_NAMESIZE]; /* interface name */
98 static eventhandler_tag ifaddr_event_tag;
101 ifaddr_change(void *arg __unused, struct ifnet *ifp)
105 struct ip_fw_chain *chain;
107 KASSERT(curvnet == ifp->if_vnet,
108 ("curvnet(%p) differs from iface vnet(%p)", curvnet, ifp->if_vnet));
110 if (V_ipfw_vnet_ready == 0 || V_ipfw_nat_ready == 0)
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;
119 /* ...using nic 'ifp->if_xname' as dynamic alias address. */
120 if (strncmp(ptr->if_name, ifp->if_xname, IF_NAMESIZE) != 0)
123 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
124 if (ifa->ifa_addr == NULL)
126 if (ifa->ifa_addr->sa_family != AF_INET)
129 ptr->ip = ((struct sockaddr_in *)
130 (ifa->ifa_addr))->sin_addr;
131 LibAliasSetAddress(ptr->lib, ptr->ip);
136 IPFW_UH_WUNLOCK(chain);
140 * delete the pointers for nat entry ix, or all of them if ix < 0
143 flush_nat_ptrs(struct ip_fw_chain *chain, const int ix)
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))
158 del_redir_spool_cfg(struct cfg_nat *n, struct redir_chain *head)
160 struct cfg_redir *r, *tmp_r;
161 struct cfg_spool *s, *tmp_s;
164 LIST_FOREACH_SAFE(r, head, _next, tmp_r) {
165 num = 1; /* Number of alias_link to delete. */
167 case NAT44_REDIR_PORT:
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);
180 free(r->alink, M_IPFW);
181 LIST_REMOVE(r, _next);
185 printf("unknown redirect mode: %u\n", r->mode);
186 /* XXX - panic?!?!? */
193 add_redir_spool_cfg(char *buf, struct cfg_nat *ptr)
197 struct nat44_cfg_redir *ser_r;
198 struct nat44_cfg_spool *ser_s;
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);
222 case NAT44_REDIR_ADDR:
223 r->alink[0] = LibAliasRedirectAddr(ptr->lib, r->laddr,
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)
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) {
242 case NAT44_REDIR_PROTO:
243 r->alink[0] = LibAliasRedirectProto(ptr->lib ,r->laddr,
244 r->raddr, r->paddr, r->proto);
247 printf("unknown redirect mode: %u\n", r->mode);
250 if (r->alink[0] == NULL) {
251 printf("LibAliasRedirect* returned NULL\n");
252 free(r->alink, M_IPFW);
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);
268 /* And finally hook this redir entry. */
269 LIST_INSERT_HEAD(&ptr->redir_chain, r, _next);
276 free_nat_instance(struct cfg_nat *ptr)
279 del_redir_spool_cfg(ptr, &ptr->redir_chain);
280 LibAliasUninit(ptr->lib);
285 * ipfw_nat - perform mbuf header translation.
287 * Note V_layer3_chain has to be locked while calling ipfw_nat() in
288 * 'global' operation mode (t == NULL).
292 ipfw_nat(struct ip_fw_args *args, struct cfg_nat *t, struct mbuf *m)
296 /* XXX - libalias duct tape */
297 int ldt, retval, found;
298 struct ip_fw_chain *chain;
303 mcl = m_megapullup(m, m->m_pkthdr.len);
308 ip = mtod(mcl, struct ip *);
311 * XXX - Libalias checksum offload 'duct tape':
313 * locally generated packets have only pseudo-header checksum
314 * calculated and libalias will break it[1], so mark them for
315 * later fix. Moreover there are cases when libalias modifies
316 * tcp packet data[2], mark them for later fix too.
318 * [1] libalias was never meant to run in kernel, so it does
319 * not have any knowledge about checksum offloading, and
320 * expects a packet with a full internet checksum.
321 * Unfortunately, packets generated locally will have just the
322 * pseudo header calculated, and when libalias tries to adjust
323 * the checksum it will actually compute a wrong value.
325 * [2] when libalias modifies tcp's data content, full TCP
326 * checksum has to be recomputed: the problem is that
327 * libalias does not have any idea about checksum offloading.
328 * To work around this, we do not do checksumming in LibAlias,
329 * but only mark the packets in th_x2 field. If we receive a
330 * marked packet, we calculate correct checksum for it
331 * aware of offloading. Why such a terrible hack instead of
332 * recalculating checksum for each packet?
333 * Because the previous checksum was not checked!
334 * Recalculating checksums for EVERY packet will hide ALL
335 * transmission errors. Yes, marked packets still suffer from
336 * this problem. But, sigh, natd(8) has this problem, too.
338 * TODO: -make libalias mbuf aware (so
339 * it can handle delayed checksum and tso)
342 if (mcl->m_pkthdr.rcvif == NULL &&
343 mcl->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
346 c = mtod(mcl, char *);
348 /* Check if this is 'global' instance */
350 if (args->flags & IPFW_ARGS_IN) {
351 /* Wrong direction, skip processing */
357 chain = &V_layer3_chain;
358 IPFW_RLOCK_ASSERT(chain);
359 /* Check every nat entry... */
360 LIST_FOREACH(t, &chain->nat, _next) {
361 if ((t->mode & PKT_ALIAS_SKIP_GLOBAL) != 0)
363 retval = LibAliasOutTry(t->lib, c,
364 mcl->m_len + M_TRAILINGSPACE(mcl), 0);
365 if (retval == PKT_ALIAS_OK) {
366 /* Nat instance recognises state */
372 /* No instance found, return ignore */
377 if (args->flags & IPFW_ARGS_IN)
378 retval = LibAliasIn(t->lib, c,
379 mcl->m_len + M_TRAILINGSPACE(mcl));
381 retval = LibAliasOut(t->lib, c,
382 mcl->m_len + M_TRAILINGSPACE(mcl));
386 * We drop packet when:
387 * 1. libalias returns PKT_ALIAS_ERROR;
388 * 2. For incoming packets:
389 * a) for unresolved fragments;
390 * b) libalias returns PKT_ALIAS_IGNORED and
391 * PKT_ALIAS_DENY_INCOMING flag is set.
393 if (retval == PKT_ALIAS_ERROR ||
394 ((args->flags & IPFW_ARGS_IN) &&
395 (retval == PKT_ALIAS_UNRESOLVED_FRAGMENT ||
396 (retval == PKT_ALIAS_IGNORED &&
397 (t->mode & PKT_ALIAS_DENY_INCOMING) != 0)))) {
398 /* XXX - should i add some logging? */
404 if (retval == PKT_ALIAS_RESPOND)
405 mcl->m_flags |= M_SKIP_FIREWALL;
406 mcl->m_pkthdr.len = mcl->m_len = ntohs(ip->ip_len);
409 * XXX - libalias checksum offload
410 * 'duct tape' (see above)
413 if ((ip->ip_off & htons(IP_OFFMASK)) == 0 &&
414 ip->ip_p == IPPROTO_TCP) {
417 th = (struct tcphdr *)(ip + 1);
425 uint16_t ip_len, cksum;
427 ip_len = ntohs(ip->ip_len);
428 cksum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
429 htons(ip->ip_p + ip_len - (ip->ip_hl << 2)));
433 th = (struct tcphdr *)(ip + 1);
435 * Maybe it was set in
440 mcl->m_pkthdr.csum_data =
441 offsetof(struct tcphdr, th_sum);
444 uh = (struct udphdr *)(ip + 1);
446 mcl->m_pkthdr.csum_data =
447 offsetof(struct udphdr, uh_sum);
450 /* No hw checksum offloading: do it ourselves */
451 if ((mcl->m_pkthdr.csum_flags & CSUM_DELAY_DATA) == 0) {
452 in_delayed_cksum(mcl);
453 mcl->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
460 static struct cfg_nat *
461 lookup_nat(struct nat_list *l, int nat_id)
465 LIST_FOREACH(res, l, _next) {
466 if (res->id == nat_id)
472 static struct cfg_nat *
473 lookup_nat_name(struct nat_list *l, char *name)
479 id = strtol(name, &errptr, 10);
480 if (id == 0 || *errptr != '\0')
483 LIST_FOREACH(res, l, _next) {
490 /* IP_FW3 configuration routines */
493 nat44_config(struct ip_fw_chain *chain, struct nat44_cfg_nat *ucfg)
495 struct cfg_nat *ptr, *tcfg;
499 * Find/create nat rule.
501 IPFW_UH_WLOCK(chain);
502 gencnt = chain->gencnt;
503 ptr = lookup_nat_name(&chain->nat, ucfg->name);
505 IPFW_UH_WUNLOCK(chain);
506 /* New rule: allocate and init new instance. */
507 ptr = malloc(sizeof(struct cfg_nat), M_IPFW, M_WAITOK | M_ZERO);
508 ptr->lib = LibAliasInit(NULL);
509 LIST_INIT(&ptr->redir_chain);
511 /* Entry already present: temporarily unhook it. */
513 LIST_REMOVE(ptr, _next);
514 flush_nat_ptrs(chain, ptr->id);
516 IPFW_UH_WUNLOCK(chain);
520 * Basic nat (re)configuration.
522 ptr->id = strtol(ucfg->name, NULL, 10);
524 * XXX - what if this rule doesn't nat any ip and just
526 * do we set aliasaddress to 0.0.0.0?
529 ptr->redir_cnt = ucfg->redir_cnt;
530 ptr->mode = ucfg->mode;
531 strlcpy(ptr->if_name, ucfg->if_name, sizeof(ptr->if_name));
532 LibAliasSetMode(ptr->lib, ptr->mode, ~0);
533 LibAliasSetAddress(ptr->lib, ptr->ip);
536 * Redir and LSNAT configuration.
538 /* Delete old cfgs. */
539 del_redir_spool_cfg(ptr, &ptr->redir_chain);
540 /* Add new entries. */
541 add_redir_spool_cfg((char *)(ucfg + 1), ptr);
542 IPFW_UH_WLOCK(chain);
544 /* Extra check to avoid race with another ipfw_nat_cfg() */
546 if (gencnt != chain->gencnt)
547 tcfg = lookup_nat_name(&chain->nat, ucfg->name);
550 LIST_REMOVE(tcfg, _next);
551 LIST_INSERT_HEAD(&chain->nat, ptr, _next);
555 IPFW_UH_WUNLOCK(chain);
558 free_nat_instance(ptr);
562 * Creates/configure nat44 instance
563 * Data layout (v0)(current):
564 * Request: [ ipfw_obj_header nat44_cfg_nat .. ]
566 * Returns 0 on success
569 nat44_cfg(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
570 struct sockopt_data *sd)
573 struct nat44_cfg_nat *ucfg;
578 /* Check minimum header size */
579 if (sd->valsize < (sizeof(*oh) + sizeof(*ucfg)))
582 oh = (ipfw_obj_header *)sd->kbuf;
584 /* Basic length checks for TLVs */
585 if (oh->ntlv.head.length != sizeof(oh->ntlv))
588 ucfg = (struct nat44_cfg_nat *)(oh + 1);
590 /* Check if name is properly terminated and looks like number */
591 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
593 id = strtol(ucfg->name, &errptr, 10);
594 if (id == 0 || *errptr != '\0')
597 read = sizeof(*oh) + sizeof(*ucfg);
598 /* Check number of redirs */
599 if (sd->valsize < read + ucfg->redir_cnt*sizeof(struct nat44_cfg_redir))
602 nat44_config(chain, ucfg);
607 * Destroys given nat instances.
608 * Data layout (v0)(current):
609 * Request: [ ipfw_obj_header ]
611 * Returns 0 on success
614 nat44_destroy(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
615 struct sockopt_data *sd)
621 /* Check minimum header size */
622 if (sd->valsize < sizeof(*oh))
625 oh = (ipfw_obj_header *)sd->kbuf;
627 /* Basic length checks for TLVs */
628 if (oh->ntlv.head.length != sizeof(oh->ntlv))
632 /* Check if name is properly terminated */
633 if (strnlen(ntlv->name, sizeof(ntlv->name)) == sizeof(ntlv->name))
636 IPFW_UH_WLOCK(chain);
637 ptr = lookup_nat_name(&chain->nat, ntlv->name);
639 IPFW_UH_WUNLOCK(chain);
643 LIST_REMOVE(ptr, _next);
644 flush_nat_ptrs(chain, ptr->id);
646 IPFW_UH_WUNLOCK(chain);
648 free_nat_instance(ptr);
654 export_nat_cfg(struct cfg_nat *ptr, struct nat44_cfg_nat *ucfg)
657 snprintf(ucfg->name, sizeof(ucfg->name), "%d", ptr->id);
659 ucfg->redir_cnt = ptr->redir_cnt;
660 ucfg->mode = ptr->mode;
661 strlcpy(ucfg->if_name, ptr->if_name, sizeof(ucfg->if_name));
665 * Gets config for given nat instance
666 * Data layout (v0)(current):
667 * Request: [ ipfw_obj_header nat44_cfg_nat .. ]
669 * Returns 0 on success
672 nat44_get_cfg(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
673 struct sockopt_data *sd)
676 struct nat44_cfg_nat *ucfg;
680 struct nat44_cfg_redir *ser_r;
681 struct nat44_cfg_spool *ser_s;
684 sz = sizeof(*oh) + sizeof(*ucfg);
685 /* Check minimum header size */
686 if (sd->valsize < sz)
689 oh = (struct _ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
691 /* Basic length checks for TLVs */
692 if (oh->ntlv.head.length != sizeof(oh->ntlv))
695 ucfg = (struct nat44_cfg_nat *)(oh + 1);
697 /* Check if name is properly terminated */
698 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
701 IPFW_UH_RLOCK(chain);
702 ptr = lookup_nat_name(&chain->nat, ucfg->name);
704 IPFW_UH_RUNLOCK(chain);
708 export_nat_cfg(ptr, ucfg);
710 /* Estimate memory amount */
711 sz = sizeof(ipfw_obj_header) + sizeof(struct nat44_cfg_nat);
712 LIST_FOREACH(r, &ptr->redir_chain, _next) {
713 sz += sizeof(struct nat44_cfg_redir);
714 LIST_FOREACH(s, &r->spool_chain, _next)
715 sz += sizeof(struct nat44_cfg_spool);
719 if (sd->valsize < sz) {
721 * Submitted buffer size is not enough.
722 * WE've already filled in @ucfg structure with
723 * relevant info including size, so we
724 * can return. Buffer will be flushed automatically.
726 IPFW_UH_RUNLOCK(chain);
730 /* Size OK, let's copy data */
731 LIST_FOREACH(r, &ptr->redir_chain, _next) {
732 ser_r = (struct nat44_cfg_redir *)ipfw_get_sopt_space(sd,
734 ser_r->mode = r->mode;
735 ser_r->laddr = r->laddr;
736 ser_r->paddr = r->paddr;
737 ser_r->raddr = r->raddr;
738 ser_r->lport = r->lport;
739 ser_r->pport = r->pport;
740 ser_r->rport = r->rport;
741 ser_r->pport_cnt = r->pport_cnt;
742 ser_r->rport_cnt = r->rport_cnt;
743 ser_r->proto = r->proto;
744 ser_r->spool_cnt = r->spool_cnt;
746 LIST_FOREACH(s, &r->spool_chain, _next) {
747 ser_s = (struct nat44_cfg_spool *)ipfw_get_sopt_space(
750 ser_s->addr = s->addr;
751 ser_s->port = s->port;
755 IPFW_UH_RUNLOCK(chain);
761 * Lists all nat44 instances currently available in kernel.
762 * Data layout (v0)(current):
763 * Request: [ ipfw_obj_lheader ]
764 * Reply: [ ipfw_obj_lheader nat44_cfg_nat x N ]
766 * Returns 0 on success
769 nat44_list_nat(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
770 struct sockopt_data *sd)
772 ipfw_obj_lheader *olh;
773 struct nat44_cfg_nat *ucfg;
777 /* Check minimum header size */
778 if (sd->valsize < sizeof(ipfw_obj_lheader))
781 olh = (ipfw_obj_lheader *)ipfw_get_sopt_header(sd, sizeof(*olh));
782 IPFW_UH_RLOCK(chain);
784 LIST_FOREACH(ptr, &chain->nat, _next)
787 olh->count = nat_count;
788 olh->objsize = sizeof(struct nat44_cfg_nat);
789 olh->size = sizeof(*olh) + olh->count * olh->objsize;
791 if (sd->valsize < olh->size) {
792 IPFW_UH_RUNLOCK(chain);
796 LIST_FOREACH(ptr, &chain->nat, _next) {
797 ucfg = (struct nat44_cfg_nat *)ipfw_get_sopt_space(sd,
799 export_nat_cfg(ptr, ucfg);
802 IPFW_UH_RUNLOCK(chain);
808 * Gets log for given nat instance
809 * Data layout (v0)(current):
810 * Request: [ ipfw_obj_header nat44_cfg_nat ]
811 * Reply: [ ipfw_obj_header nat44_cfg_nat LOGBUFFER ]
813 * Returns 0 on success
816 nat44_get_log(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
817 struct sockopt_data *sd)
820 struct nat44_cfg_nat *ucfg;
825 sz = sizeof(*oh) + sizeof(*ucfg);
826 /* Check minimum header size */
827 if (sd->valsize < sz)
830 oh = (struct _ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
832 /* Basic length checks for TLVs */
833 if (oh->ntlv.head.length != sizeof(oh->ntlv))
836 ucfg = (struct nat44_cfg_nat *)(oh + 1);
838 /* Check if name is properly terminated */
839 if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
842 IPFW_UH_RLOCK(chain);
843 ptr = lookup_nat_name(&chain->nat, ucfg->name);
845 IPFW_UH_RUNLOCK(chain);
849 if (ptr->lib->logDesc == NULL) {
850 IPFW_UH_RUNLOCK(chain);
854 export_nat_cfg(ptr, ucfg);
856 /* Estimate memory amount */
857 ucfg->size = sizeof(struct nat44_cfg_nat) + LIBALIAS_BUF_SIZE;
858 if (sd->valsize < sz + sizeof(*oh)) {
860 * Submitted buffer size is not enough.
861 * WE've already filled in @ucfg structure with
862 * relevant info including size, so we
863 * can return. Buffer will be flushed automatically.
865 IPFW_UH_RUNLOCK(chain);
869 pbuf = (void *)ipfw_get_sopt_space(sd, LIBALIAS_BUF_SIZE);
870 memcpy(pbuf, ptr->lib->logDesc, LIBALIAS_BUF_SIZE);
872 IPFW_UH_RUNLOCK(chain);
877 static struct ipfw_sopt_handler scodes[] = {
878 { IP_FW_NAT44_XCONFIG, 0, HDIR_SET, nat44_cfg },
879 { IP_FW_NAT44_DESTROY, 0, HDIR_SET, nat44_destroy },
880 { IP_FW_NAT44_XGETCONFIG, 0, HDIR_GET, nat44_get_cfg },
881 { IP_FW_NAT44_LIST_NAT, 0, HDIR_GET, nat44_list_nat },
882 { IP_FW_NAT44_XGETLOG, 0, HDIR_GET, nat44_get_log },
886 * Legacy configuration routines
889 struct cfg_spool_legacy {
890 LIST_ENTRY(cfg_spool_legacy) _next;
895 struct cfg_redir_legacy {
896 LIST_ENTRY(cfg_redir) _next;
898 struct in_addr laddr;
899 struct in_addr paddr;
900 struct in_addr raddr;
907 struct alias_link **alink;
909 LIST_HEAD(, cfg_spool_legacy) spool_chain;
912 struct cfg_nat_legacy {
913 LIST_ENTRY(cfg_nat_legacy) _next;
916 char if_name[IF_NAMESIZE];
918 struct libalias *lib;
920 LIST_HEAD(, cfg_redir_legacy) redir_chain;
924 ipfw_nat_cfg(struct sockopt *sopt)
926 struct cfg_nat_legacy *cfg;
927 struct nat44_cfg_nat *ucfg;
928 struct cfg_redir_legacy *rdir;
929 struct nat44_cfg_redir *urdir;
934 len = sopt->sopt_valsize;
938 * Allocate 2x buffer to store converted structures.
939 * new redir_cfg has shrunk, so we're sure that
940 * new buffer size is enough.
942 buf = malloc(roundup2(len, 8) + len2, M_TEMP, M_WAITOK | M_ZERO);
943 error = sooptcopyin(sopt, buf, len, sizeof(struct cfg_nat_legacy));
947 cfg = (struct cfg_nat_legacy *)buf;
953 ucfg = (struct nat44_cfg_nat *)&buf[roundup2(len, 8)];
954 snprintf(ucfg->name, sizeof(ucfg->name), "%d", cfg->id);
955 strlcpy(ucfg->if_name, cfg->if_name, sizeof(ucfg->if_name));
957 ucfg->mode = cfg->mode;
958 ucfg->redir_cnt = cfg->redir_cnt;
960 if (len < sizeof(*cfg) + cfg->redir_cnt * sizeof(*rdir)) {
965 urdir = (struct nat44_cfg_redir *)(ucfg + 1);
966 rdir = (struct cfg_redir_legacy *)(cfg + 1);
967 for (i = 0; i < cfg->redir_cnt; i++) {
968 urdir->mode = rdir->mode;
969 urdir->laddr = rdir->laddr;
970 urdir->paddr = rdir->paddr;
971 urdir->raddr = rdir->raddr;
972 urdir->lport = rdir->lport;
973 urdir->pport = rdir->pport;
974 urdir->rport = rdir->rport;
975 urdir->pport_cnt = rdir->pport_cnt;
976 urdir->rport_cnt = rdir->rport_cnt;
977 urdir->proto = rdir->proto;
978 urdir->spool_cnt = rdir->spool_cnt;
984 nat44_config(&V_layer3_chain, ucfg);
992 ipfw_nat_del(struct sockopt *sopt)
995 struct ip_fw_chain *chain = &V_layer3_chain;
998 sooptcopyin(sopt, &i, sizeof i, sizeof i);
1000 IPFW_UH_WLOCK(chain);
1001 ptr = lookup_nat(&chain->nat, i);
1003 IPFW_UH_WUNLOCK(chain);
1007 LIST_REMOVE(ptr, _next);
1008 flush_nat_ptrs(chain, i);
1009 IPFW_WUNLOCK(chain);
1010 IPFW_UH_WUNLOCK(chain);
1011 free_nat_instance(ptr);
1016 ipfw_nat_get_cfg(struct sockopt *sopt)
1018 struct ip_fw_chain *chain = &V_layer3_chain;
1020 struct cfg_nat_legacy *ucfg;
1021 struct cfg_redir *r;
1022 struct cfg_spool *s;
1023 struct cfg_redir_legacy *ser_r;
1024 struct cfg_spool_legacy *ser_s;
1026 int gencnt, nat_cnt, len, error;
1029 len = sizeof(nat_cnt);
1031 IPFW_UH_RLOCK(chain);
1033 gencnt = chain->gencnt;
1034 /* Estimate memory amount */
1035 LIST_FOREACH(n, &chain->nat, _next) {
1037 len += sizeof(struct cfg_nat_legacy);
1038 LIST_FOREACH(r, &n->redir_chain, _next) {
1039 len += sizeof(struct cfg_redir_legacy);
1040 LIST_FOREACH(s, &r->spool_chain, _next)
1041 len += sizeof(struct cfg_spool_legacy);
1044 IPFW_UH_RUNLOCK(chain);
1046 data = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
1047 bcopy(&nat_cnt, data, sizeof(nat_cnt));
1050 len = sizeof(nat_cnt);
1052 IPFW_UH_RLOCK(chain);
1053 if (gencnt != chain->gencnt) {
1057 /* Serialize all the data. */
1058 LIST_FOREACH(n, &chain->nat, _next) {
1059 ucfg = (struct cfg_nat_legacy *)&data[len];
1062 ucfg->redir_cnt = n->redir_cnt;
1063 ucfg->mode = n->mode;
1064 strlcpy(ucfg->if_name, n->if_name, sizeof(ucfg->if_name));
1065 len += sizeof(struct cfg_nat_legacy);
1066 LIST_FOREACH(r, &n->redir_chain, _next) {
1067 ser_r = (struct cfg_redir_legacy *)&data[len];
1068 ser_r->mode = r->mode;
1069 ser_r->laddr = r->laddr;
1070 ser_r->paddr = r->paddr;
1071 ser_r->raddr = r->raddr;
1072 ser_r->lport = r->lport;
1073 ser_r->pport = r->pport;
1074 ser_r->rport = r->rport;
1075 ser_r->pport_cnt = r->pport_cnt;
1076 ser_r->rport_cnt = r->rport_cnt;
1077 ser_r->proto = r->proto;
1078 ser_r->spool_cnt = r->spool_cnt;
1079 len += sizeof(struct cfg_redir_legacy);
1080 LIST_FOREACH(s, &r->spool_chain, _next) {
1081 ser_s = (struct cfg_spool_legacy *)&data[len];
1082 ser_s->addr = s->addr;
1083 ser_s->port = s->port;
1084 len += sizeof(struct cfg_spool_legacy);
1088 IPFW_UH_RUNLOCK(chain);
1090 error = sooptcopyout(sopt, data, len);
1097 ipfw_nat_get_log(struct sockopt *sopt)
1100 struct cfg_nat *ptr;
1102 struct ip_fw_chain *chain;
1105 chain = &V_layer3_chain;
1108 /* one pass to count, one to copy the data */
1110 LIST_FOREACH(ptr, &chain->nat, _next) {
1111 if (ptr->lib->logDesc == NULL)
1115 size = i * (LIBALIAS_BUF_SIZE + sizeof(int));
1116 data = malloc(size, M_IPFW, M_NOWAIT | M_ZERO);
1118 IPFW_RUNLOCK(chain);
1122 LIST_FOREACH(ptr, &chain->nat, _next) {
1123 if (ptr->lib->logDesc == NULL)
1125 bcopy(&ptr->id, &data[i], sizeof(int));
1127 bcopy(ptr->lib->logDesc, &data[i], LIBALIAS_BUF_SIZE);
1128 i += LIBALIAS_BUF_SIZE;
1130 IPFW_RUNLOCK(chain);
1131 sooptcopyout(sopt, data, size);
1137 vnet_ipfw_nat_init(const void *arg __unused)
1140 V_ipfw_nat_ready = 1;
1145 vnet_ipfw_nat_uninit(const void *arg __unused)
1147 struct cfg_nat *ptr, *ptr_temp;
1148 struct ip_fw_chain *chain;
1150 chain = &V_layer3_chain;
1152 V_ipfw_nat_ready = 0;
1153 LIST_FOREACH_SAFE(ptr, &chain->nat, _next, ptr_temp) {
1154 LIST_REMOVE(ptr, _next);
1155 free_nat_instance(ptr);
1157 flush_nat_ptrs(chain, -1 /* flush all */);
1158 IPFW_WUNLOCK(chain);
1166 /* init ipfw hooks */
1167 ipfw_nat_ptr = ipfw_nat;
1168 lookup_nat_ptr = lookup_nat;
1169 ipfw_nat_cfg_ptr = ipfw_nat_cfg;
1170 ipfw_nat_del_ptr = ipfw_nat_del;
1171 ipfw_nat_get_cfg_ptr = ipfw_nat_get_cfg;
1172 ipfw_nat_get_log_ptr = ipfw_nat_get_log;
1173 IPFW_ADD_SOPT_HANDLER(1, scodes);
1175 ifaddr_event_tag = EVENTHANDLER_REGISTER(ifaddr_event, ifaddr_change,
1176 NULL, EVENTHANDLER_PRI_ANY);
1180 ipfw_nat_destroy(void)
1183 EVENTHANDLER_DEREGISTER(ifaddr_event, ifaddr_event_tag);
1184 /* deregister ipfw_nat */
1185 IPFW_DEL_SOPT_HANDLER(1, scodes);
1186 ipfw_nat_ptr = NULL;
1187 lookup_nat_ptr = NULL;
1188 ipfw_nat_cfg_ptr = NULL;
1189 ipfw_nat_del_ptr = NULL;
1190 ipfw_nat_get_cfg_ptr = NULL;
1191 ipfw_nat_get_log_ptr = NULL;
1195 ipfw_nat_modevent(module_t mod, int type, void *unused)
1213 static moduledata_t ipfw_nat_mod = {
1219 /* Define startup order. */
1220 #define IPFW_NAT_SI_SUB_FIREWALL SI_SUB_PROTO_FIREWALL
1221 #define IPFW_NAT_MODEVENT_ORDER (SI_ORDER_ANY - 128) /* after ipfw */
1222 #define IPFW_NAT_MODULE_ORDER (IPFW_NAT_MODEVENT_ORDER + 1)
1223 #define IPFW_NAT_VNET_ORDER (IPFW_NAT_MODEVENT_ORDER + 2)
1225 DECLARE_MODULE(ipfw_nat, ipfw_nat_mod, IPFW_NAT_SI_SUB_FIREWALL, SI_ORDER_ANY);
1226 MODULE_DEPEND(ipfw_nat, libalias, 1, 1, 1);
1227 MODULE_DEPEND(ipfw_nat, ipfw, 3, 3, 3);
1228 MODULE_VERSION(ipfw_nat, 1);
1230 SYSINIT(ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
1231 ipfw_nat_init, NULL);
1232 VNET_SYSINIT(vnet_ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_VNET_ORDER,
1233 vnet_ipfw_nat_init, NULL);
1235 SYSUNINIT(ipfw_nat_destroy, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
1236 ipfw_nat_destroy, NULL);
1237 VNET_SYSUNINIT(vnet_ipfw_nat_uninit, IPFW_NAT_SI_SUB_FIREWALL,
1238 IPFW_NAT_VNET_ORDER, vnet_ipfw_nat_uninit, NULL);