1
2 /*
3 * Copyright (C) 2012 by Darren Reed.
4 *
5 * See the IPFILTER.LICENCE file for details on licencing.
6 */
7 #if defined(KERNEL) || defined(_KERNEL)
8 # undef KERNEL
9 # undef _KERNEL
10 # define KERNEL 1
11 # define _KERNEL 1
12 #endif
13 #include <sys/errno.h>
14 #include <sys/types.h>
15 #include <sys/param.h>
16 #include <sys/time.h>
17 #include <sys/file.h>
18 # include <sys/fcntl.h>
19 #if !defined(_KERNEL) && !defined(__KERNEL__)
20 # include <stdio.h>
21 # include <string.h>
22 # include <stdlib.h>
23 # include <ctype.h>
24 # define _KERNEL
25 # include <sys/uio.h>
26 # undef _KERNEL
27 #endif
28 # include <sys/protosw.h>
29 #include <sys/socket.h>
30 #if defined(_KERNEL)
31 #ifdef __FreeBSD__
32 # include <sys/ctype.h>
33 # endif
34 # include <sys/systm.h>
35 # if !defined(__SVR4)
36 # include <sys/mbuf.h>
37 # endif
38 #endif
39 #if defined(_KERNEL) && defined(__FreeBSD__)
40 # include <sys/filio.h>
41 # include <sys/fcntl.h>
42 #else
43 # include <sys/ioctl.h>
44 #endif
45 #if defined(__SVR4)
46 # include <sys/byteorder.h>
47 # ifdef _KERNEL
48 # include <sys/dditypes.h>
49 # endif
50 # include <sys/stream.h>
51 # include <sys/kmem.h>
52 #endif
53 #ifdef __FreeBSD__
54 # include <sys/queue.h>
55 #endif
56 #include <net/if.h>
57 #if defined(__FreeBSD__) && defined(_KERNEL)
58 #include <net/vnet.h>
59 #else
60 #define CURVNET_SET(arg)
61 #define CURVNET_RESTORE()
62 #define VNET_DEFINE(_t, _v) _t _v
63 #define VNET_DECLARE(_t, _v) extern _t _v
64 #define VNET(arg) arg
65 #endif
66 #ifdef sun
67 # include <net/af.h>
68 #endif
69 #include <netinet/in.h>
70 #include <netinet/in_systm.h>
71 #include <netinet/ip.h>
72 # include <netinet/ip_var.h>
73 #include <netinet/tcp.h>
74 #include <netinet/udp.h>
75 #include <netinet/ip_icmp.h>
76 #include "netinet/ip_compat.h"
77 #include <netinet/tcpip.h>
78 #include "netinet/ip_fil.h"
79 #include "netinet/ip_nat.h"
80 #include "netinet/ip_state.h"
81 #include "netinet/ip_proxy.h"
82 #if defined(__FreeBSD__)
83 # include <sys/malloc.h>
84 #endif
85
86 /* END OF INCLUDES */
87
88 #include "netinet/ip_ftp_pxy.c"
89 #include "netinet/ip_tftp_pxy.c"
90 #include "netinet/ip_rcmd_pxy.c"
91 #include "netinet/ip_pptp_pxy.c"
92 #if defined(_KERNEL)
93 # include "netinet/ip_irc_pxy.c"
94 # include "netinet/ip_raudio_pxy.c"
95 # include "netinet/ip_netbios_pxy.c"
96 #endif
97 #include "netinet/ip_ipsec_pxy.c"
98 #include "netinet/ip_rpcb_pxy.c"
99
100 #if !defined(lint)
101 static const char rcsid[] = "@(#)$Id$";
102 #endif
103
104 #define AP_SESS_SIZE 53
105
106 static int ipf_proxy_fixseqack(fr_info_t *, ip_t *, ap_session_t *, int );
107 static aproxy_t *ipf_proxy_create_clone(ipf_main_softc_t *, aproxy_t *);
108
109 typedef struct ipf_proxy_softc_s {
110 int ips_proxy_debug;
111 int ips_proxy_session_size;
112 ap_session_t **ips_sess_tab;
113 ap_session_t *ips_sess_list;
114 aproxy_t *ips_proxies;
115 int ips_init_run;
116 ipftuneable_t *ipf_proxy_tune;
117 } ipf_proxy_softc_t;
118
119 static ipftuneable_t ipf_proxy_tuneables[] = {
120 { { (void *)offsetof(ipf_proxy_softc_t, ips_proxy_debug) },
121 "proxy_debug", 0, 0x1f,
122 stsizeof(ipf_proxy_softc_t, ips_proxy_debug),
123 0, NULL, NULL },
124 { { NULL }, NULL, 0, 0,
125 0,
126 0, NULL, NULL}
127 };
128
129 static aproxy_t *ap_proxylist = NULL;
130 static aproxy_t ips_proxies[] = {
131 #ifdef IPF_FTP_PROXY
132 { NULL, NULL, "ftp", (char)IPPROTO_TCP, 0, 0, 0,
133 ipf_p_ftp_main_load, ipf_p_ftp_main_unload,
134 ipf_p_ftp_soft_create, ipf_p_ftp_soft_destroy,
135 NULL, NULL,
136 ipf_p_ftp_new, ipf_p_ftp_del, ipf_p_ftp_in, ipf_p_ftp_out, NULL,
137 NULL, NULL, NULL, NULL },
138 #endif
139 #ifdef IPF_TFTP_PROXY
140 { NULL, NULL, "tftp", (char)IPPROTO_UDP, 0, 0, 0,
141 ipf_p_tftp_main_load, ipf_p_tftp_main_unload,
142 ipf_p_tftp_soft_create, ipf_p_tftp_soft_destroy,
143 NULL, NULL,
144 ipf_p_tftp_new, ipf_p_tftp_del,
145 ipf_p_tftp_in, ipf_p_tftp_out, NULL,
146 NULL, NULL, NULL, NULL },
147 #endif
148 #ifdef IPF_IRC_PROXY
149 { NULL, NULL, "irc", (char)IPPROTO_TCP, 0, 0, 0,
150 ipf_p_irc_main_load, ipf_p_irc_main_unload,
151 NULL, NULL,
152 NULL, NULL,
153 ipf_p_irc_new, NULL, NULL, ipf_p_irc_out, NULL,
154 NULL, NULL, NULL, NULL },
155 #endif
156 #ifdef IPF_RCMD_PROXY
157 { NULL, NULL, "rcmd", (char)IPPROTO_TCP, 0, 0, 0,
158 ipf_p_rcmd_main_load, ipf_p_rcmd_main_unload,
159 NULL, NULL,
160 NULL, NULL,
161 ipf_p_rcmd_new, ipf_p_rcmd_del,
162 ipf_p_rcmd_in, ipf_p_rcmd_out, NULL,
163 NULL, NULL, NULL, NULL },
164 #endif
165 #ifdef IPF_RAUDIO_PROXY
166 { NULL, NULL, "raudio", (char)IPPROTO_TCP, 0, 0, 0,
167 ipf_p_raudio_main_load, ipf_p_raudio_main_unload,
168 NULL, NULL,
169 NULL, NULL,
170 ipf_p_raudio_new, NULL, ipf_p_raudio_in, ipf_p_raudio_out, NULL,
171 NULL, NULL, NULL, NULL },
172 #endif
173 #ifdef IPF_MSNRPC_PROXY
174 { NULL, NULL, "msnrpc", (char)IPPROTO_TCP, 0, 0, 0,
175 ipf_p_msnrpc_init, ipf_p_msnrpc_fini,
176 NULL, NULL,
177 NULL, NULL,
178 ipf_p_msnrpc_new, NULL, ipf_p_msnrpc_in, ipf_p_msnrpc_out, NULL,
179 NULL, NULL, NULL, NULL },
180 #endif
181 #ifdef IPF_NETBIOS_PROXY
182 { NULL, NULL, "netbios", (char)IPPROTO_UDP, 0, 0, 0,
183 ipf_p_netbios_main_load, ipf_p_netbios_main_unload,
184 NULL, NULL,
185 NULL, NULL,
186 NULL, NULL, NULL, ipf_p_netbios_out, NULL,
187 NULL, NULL, NULL, NULL },
188 #endif
189 #ifdef IPF_IPSEC_PROXY
190 { NULL, NULL, "ipsec", (char)IPPROTO_UDP, 0, 0, 0,
191 NULL, NULL,
192 ipf_p_ipsec_soft_create, ipf_p_ipsec_soft_destroy,
193 ipf_p_ipsec_soft_init, ipf_p_ipsec_soft_fini,
194 ipf_p_ipsec_new, ipf_p_ipsec_del,
195 ipf_p_ipsec_inout, ipf_p_ipsec_inout, ipf_p_ipsec_match,
196 NULL, NULL, NULL, NULL },
197 #endif
198 #ifdef IPF_DNS_PROXY
199 { NULL, NULL, "dns", (char)IPPROTO_UDP, 0, 0, 0,
200 NULL, NULL,
201 ipf_p_dns_soft_create, ipf_p_dns_soft_destroy,
202 NULL, NULL,
203 ipf_p_dns_new, ipf_p_ipsec_del,
204 ipf_p_dns_inout, ipf_p_dns_inout, ipf_p_dns_match,
205 ipf_p_dns_ctl, NULL, NULL, NULL },
206 #endif
207 #ifdef IPF_PPTP_PROXY
208 { NULL, NULL, "pptp", (char)IPPROTO_TCP, 0, 0, 0,
209 ipf_p_pptp_main_load, ipf_p_pptp_main_unload,
210 NULL, NULL,
211 NULL, NULL,
212 ipf_p_pptp_new, ipf_p_pptp_del,
213 ipf_p_pptp_inout, ipf_p_pptp_inout, NULL,
214 NULL, NULL, NULL, NULL },
215 #endif
216 #ifdef IPF_RPCB_PROXY
217 # ifndef _KERNEL
218 { NULL, NULL, "rpcbt", (char)IPPROTO_TCP, 0, 0, 0,
219 NULL, NULL,
220 NULL, NULL,
221 NULL, NULL,
222 ipf_p_rpcb_new, ipf_p_rpcb_del,
223 ipf_p_rpcb_in, ipf_p_rpcb_out, NULL,
224 NULL, NULL, NULL, NULL },
225 # endif
226 { NULL, NULL, "rpcbu", (char)IPPROTO_UDP, 0, 0, 0,
227 ipf_p_rpcb_main_load, ipf_p_rpcb_main_unload,
228 NULL, NULL,
229 NULL, NULL,
230 ipf_p_rpcb_new, ipf_p_rpcb_del,
231 ipf_p_rpcb_in, ipf_p_rpcb_out, NULL,
232 NULL, NULL, NULL, NULL },
233 #endif
234 { NULL, NULL, "", '\0', 0, 0, 0,
235 NULL, NULL,
236 NULL, NULL,
237 NULL, NULL,
238 NULL, NULL,
239 NULL, NULL, NULL,
240 NULL, NULL, NULL, NULL }
241 };
242
243
244 /* ------------------------------------------------------------------------ */
245 /* Function: ipf_proxy_main_load */
246 /* Returns: int - 0 == success, else failure. */
247 /* Parameters: Nil */
248 /* */
249 /* Initialise hook for kernel application proxies. */
250 /* Call the initialise routine for all the compiled in kernel proxies. */
251 /* ------------------------------------------------------------------------ */
252 int
ipf_proxy_main_load(void)253 ipf_proxy_main_load(void)
254 {
255 aproxy_t *ap;
256
257 for (ap = ips_proxies; ap->apr_p; ap++) {
258 if (ap->apr_load != NULL)
259 (*ap->apr_load)();
260 }
261 return (0);
262 }
263
264
265 /* ------------------------------------------------------------------------ */
266 /* Function: ipf_proxy_main_unload */
267 /* Returns: int - 0 == success, else failure. */
268 /* Parameters: Nil */
269 /* */
270 /* Unload hook for kernel application proxies. */
271 /* Call the finialise routine for all the compiled in kernel proxies. */
272 /* ------------------------------------------------------------------------ */
273 int
ipf_proxy_main_unload(void)274 ipf_proxy_main_unload(void)
275 {
276 aproxy_t *ap;
277
278 for (ap = ips_proxies; ap->apr_p; ap++)
279 if (ap->apr_unload != NULL)
280 (*ap->apr_unload)();
281 for (ap = ap_proxylist; ap; ap = ap->apr_next)
282 if (ap->apr_unload != NULL)
283 (*ap->apr_unload)();
284
285 return (0);
286 }
287
288
289 /* ------------------------------------------------------------------------ */
290 /* Function: ipf_proxy_soft_create */
291 /* Returns: void * - */
292 /* Parameters: softc(I) - pointer to soft context main structure */
293 /* */
294 /* Build the structure to hold all of the run time data to support proxies. */
295 /* ------------------------------------------------------------------------ */
296 void *
ipf_proxy_soft_create(ipf_main_softc_t * softc)297 ipf_proxy_soft_create(ipf_main_softc_t *softc)
298 {
299 ipf_proxy_softc_t *softp;
300 aproxy_t *last;
301 aproxy_t *apn;
302 aproxy_t *ap;
303
304 KMALLOC(softp, ipf_proxy_softc_t *);
305 if (softp == NULL)
306 return (softp);
307
308 bzero((char *)softp, sizeof(*softp));
309
310 #if defined(_KERNEL)
311 softp->ips_proxy_debug = 0;
312 #else
313 softp->ips_proxy_debug = 2;
314 #endif
315 softp->ips_proxy_session_size = AP_SESS_SIZE;
316
317 softp->ipf_proxy_tune = ipf_tune_array_copy(softp,
318 sizeof(ipf_proxy_tuneables),
319 ipf_proxy_tuneables);
320 if (softp->ipf_proxy_tune == NULL) {
321 ipf_proxy_soft_destroy(softc, softp);
322 return (NULL);
323 }
324 if (ipf_tune_array_link(softc, softp->ipf_proxy_tune) == -1) {
325 ipf_proxy_soft_destroy(softc, softp);
326 return (NULL);
327 }
328
329 last = NULL;
330 for (ap = ips_proxies; ap->apr_p; ap++) {
331 apn = ipf_proxy_create_clone(softc, ap);
332 if (apn == NULL)
333 goto failed;
334 if (last != NULL)
335 last->apr_next = apn;
336 else
337 softp->ips_proxies = apn;
338 last = apn;
339 }
340 for (ap = ips_proxies; ap != NULL; ap = ap->apr_next) {
341 apn = ipf_proxy_create_clone(softc, ap);
342 if (apn == NULL)
343 goto failed;
344 if (last != NULL)
345 last->apr_next = apn;
346 else
347 softp->ips_proxies = apn;
348 last = apn;
349 }
350
351 return (softp);
352 failed:
353 ipf_proxy_soft_destroy(softc, softp);
354 return (NULL);
355 }
356
357
358 /* ------------------------------------------------------------------------ */
359 /* Function: ipf_proxy_soft_create */
360 /* Returns: void * - */
361 /* Parameters: softc(I) - pointer to soft context main structure */
362 /* orig(I) - pointer to proxy definition to copy */
363 /* */
364 /* This function clones a proxy definition given by orig and returns a */
365 /* a pointer to that copy. */
366 /* ------------------------------------------------------------------------ */
367 static aproxy_t *
ipf_proxy_create_clone(ipf_main_softc_t * softc,aproxy_t * orig)368 ipf_proxy_create_clone(ipf_main_softc_t *softc, aproxy_t *orig)
369 {
370 aproxy_t *apn;
371
372 KMALLOC(apn, aproxy_t *);
373 if (apn == NULL)
374 return (NULL);
375
376 bcopy((char *)orig, (char *)apn, sizeof(*apn));
377 apn->apr_next = NULL;
378 apn->apr_soft = NULL;
379
380 if (apn->apr_create != NULL) {
381 apn->apr_soft = (*apn->apr_create)(softc);
382 if (apn->apr_soft == NULL) {
383 KFREE(apn);
384 return (NULL);
385 }
386 }
387
388 apn->apr_parent = orig;
389 orig->apr_clones++;
390
391 return (apn);
392 }
393
394
395 /* ------------------------------------------------------------------------ */
396 /* Function: ipf_proxy_soft_create */
397 /* Returns: int - 0 == success, else failure. */
398 /* Parameters: softc(I) - pointer to soft context main structure */
399 /* arg(I) - pointer to proxy contect data */
400 /* */
401 /* Initialise the proxy context and walk through each of the proxies and */
402 /* call its initialisation function. This allows for proxies to do any */
403 /* local setup prior to actual use. */
404 /* ------------------------------------------------------------------------ */
405 int
ipf_proxy_soft_init(ipf_main_softc_t * softc,void * arg)406 ipf_proxy_soft_init(ipf_main_softc_t *softc, void *arg)
407 {
408 ipf_proxy_softc_t *softp;
409 aproxy_t *ap;
410 u_int size;
411 int err;
412
413 softp = arg;
414 size = softp->ips_proxy_session_size * sizeof(ap_session_t *);
415
416 KMALLOCS(softp->ips_sess_tab, ap_session_t **, size);
417
418 if (softp->ips_sess_tab == NULL)
419 return (-1);
420
421 bzero(softp->ips_sess_tab, size);
422
423 for (ap = softp->ips_proxies; ap != NULL; ap = ap->apr_next) {
424 if (ap->apr_init != NULL) {
425 err = (*ap->apr_init)(softc, ap->apr_soft);
426 if (err != 0)
427 return (-2);
428 }
429 }
430 softp->ips_init_run = 1;
431
432 return (0);
433 }
434
435
436 /* ------------------------------------------------------------------------ */
437 /* Function: ipf_proxy_soft_create */
438 /* Returns: int - 0 == success, else failure. */
439 /* Parameters: softc(I) - pointer to soft context main structure */
440 /* arg(I) - pointer to proxy contect data */
441 /* */
442 /* This function should always succeed. It is responsible for ensuring that */
443 /* the proxy context can be safely called when ipf_proxy_soft_destroy is */
444 /* called and suring all of the proxies have similarly been instructed. */
445 /* ------------------------------------------------------------------------ */
446 int
ipf_proxy_soft_fini(ipf_main_softc_t * softc,void * arg)447 ipf_proxy_soft_fini(ipf_main_softc_t *softc, void *arg)
448 {
449 ipf_proxy_softc_t *softp = arg;
450 aproxy_t *ap;
451
452 for (ap = softp->ips_proxies; ap != NULL; ap = ap->apr_next) {
453 if (ap->apr_fini != NULL) {
454 (*ap->apr_fini)(softc, ap->apr_soft);
455 }
456 }
457
458 if (softp->ips_sess_tab != NULL) {
459 KFREES(softp->ips_sess_tab,
460 softp->ips_proxy_session_size * sizeof(ap_session_t *));
461 softp->ips_sess_tab = NULL;
462 }
463 softp->ips_init_run = 0;
464
465 return (0);
466 }
467
468
469 /* ------------------------------------------------------------------------ */
470 /* Function: ipf_proxy_soft_destroy */
471 /* Returns: Nil */
472 /* Parameters: softc(I) - pointer to soft context main structure */
473 /* arg(I) - pointer to proxy contect data */
474 /* */
475 /* Free up all of the local data structures allocated during creation. */
476 /* ------------------------------------------------------------------------ */
477 void
ipf_proxy_soft_destroy(ipf_main_softc_t * softc,void * arg)478 ipf_proxy_soft_destroy(ipf_main_softc_t *softc, void *arg)
479 {
480 ipf_proxy_softc_t *softp = arg;
481 aproxy_t *ap;
482
483 while ((ap = softp->ips_proxies) != NULL) {
484 softp->ips_proxies = ap->apr_next;
485 if (ap->apr_destroy != NULL)
486 (*ap->apr_destroy)(softc, ap->apr_soft);
487 ap->apr_parent->apr_clones--;
488 KFREE(ap);
489 }
490
491 if (softp->ipf_proxy_tune != NULL) {
492 ipf_tune_array_unlink(softc, softp->ipf_proxy_tune);
493 KFREES(softp->ipf_proxy_tune, sizeof(ipf_proxy_tuneables));
494 softp->ipf_proxy_tune = NULL;
495 }
496
497 KFREE(softp);
498 }
499
500
501 /* ------------------------------------------------------------------------ */
502 /* Function: ipf_proxy_flush */
503 /* Returns: Nil */
504 /* Parameters: arg(I) - pointer to proxy contect data */
505 /* how(I) - indicates the type of flush operation */
506 /* */
507 /* Walk through all of the proxies and pass on the flush command as either */
508 /* a flush or a clear. */
509 /* ------------------------------------------------------------------------ */
510 void
ipf_proxy_flush(void * arg,int how)511 ipf_proxy_flush(void *arg, int how)
512 {
513 ipf_proxy_softc_t *softp = arg;
514 aproxy_t *ap;
515
516 switch (how)
517 {
518 case 0 :
519 for (ap = softp->ips_proxies; ap; ap = ap->apr_next)
520 if (ap->apr_flush != NULL)
521 (*ap->apr_flush)(ap, how);
522 break;
523 case 1 :
524 for (ap = softp->ips_proxies; ap; ap = ap->apr_next)
525 if (ap->apr_clear != NULL)
526 (*ap->apr_clear)(ap);
527 break;
528 default :
529 break;
530 }
531 }
532
533
534 /* ------------------------------------------------------------------------ */
535 /* Function: ipf_proxy_add */
536 /* Returns: int - 0 == success, else failure. */
537 /* Parameters: ap(I) - pointer to proxy structure */
538 /* */
539 /* Dynamically add a new kernel proxy. Ensure that it is unique in the */
540 /* collection compiled in and dynamically added. */
541 /* ------------------------------------------------------------------------ */
542 int
ipf_proxy_add(void * arg,aproxy_t * ap)543 ipf_proxy_add(void *arg, aproxy_t *ap)
544 {
545 ipf_proxy_softc_t *softp = arg;
546
547 aproxy_t *a;
548
549 for (a = ips_proxies; a->apr_p; a++)
550 if ((a->apr_p == ap->apr_p) &&
551 !strncmp(a->apr_label, ap->apr_label,
552 sizeof(ap->apr_label))) {
553 if (softp->ips_proxy_debug & 0x01)
554 printf("ipf_proxy_add: %s/%d present (B)\n",
555 a->apr_label, a->apr_p);
556 return (-1);
557 }
558
559 for (a = ap_proxylist; (a != NULL); a = a->apr_next)
560 if ((a->apr_p == ap->apr_p) &&
561 !strncmp(a->apr_label, ap->apr_label,
562 sizeof(ap->apr_label))) {
563 if (softp->ips_proxy_debug & 0x01)
564 printf("ipf_proxy_add: %s/%d present (D)\n",
565 a->apr_label, a->apr_p);
566 return (-1);
567 }
568 ap->apr_next = ap_proxylist;
569 ap_proxylist = ap;
570 if (ap->apr_load != NULL)
571 (*ap->apr_load)();
572 return (0);
573 }
574
575
576 /* ------------------------------------------------------------------------ */
577 /* Function: ipf_proxy_ctl */
578 /* Returns: int - 0 == success, else error */
579 /* Parameters: softc(I) - pointer to soft context main structure */
580 /* arg(I) - pointer to proxy context */
581 /* ctl(I) - pointer to proxy control structure */
582 /* */
583 /* Check to see if the proxy this control request has come through for */
584 /* exists, and if it does and it has a control function then invoke that */
585 /* control function. */
586 /* ------------------------------------------------------------------------ */
587 int
ipf_proxy_ctl(ipf_main_softc_t * softc,void * arg,ap_ctl_t * ctl)588 ipf_proxy_ctl(ipf_main_softc_t *softc, void *arg, ap_ctl_t *ctl)
589 {
590 ipf_proxy_softc_t *softp = arg;
591 aproxy_t *a;
592 int error;
593
594 a = ipf_proxy_lookup(arg, ctl->apc_p, ctl->apc_label);
595 if (a == NULL) {
596 if (softp->ips_proxy_debug & 0x01)
597 printf("ipf_proxy_ctl: can't find %s/%d\n",
598 ctl->apc_label, ctl->apc_p);
599 IPFERROR(80001);
600 error = ESRCH;
601 } else if (a->apr_ctl == NULL) {
602 if (softp->ips_proxy_debug & 0x01)
603 printf("ipf_proxy_ctl: no ctl function for %s/%d\n",
604 ctl->apc_label, ctl->apc_p);
605 IPFERROR(80002);
606 error = ENXIO;
607 } else {
608 error = (*a->apr_ctl)(softc, a->apr_soft, ctl);
609 if ((error != 0) && (softp->ips_proxy_debug & 0x02))
610 printf("ipf_proxy_ctl: %s/%d ctl error %d\n",
611 a->apr_label, a->apr_p, error);
612 }
613 return (error);
614 }
615
616
617 /* ------------------------------------------------------------------------ */
618 /* Function: ipf_proxy_del */
619 /* Returns: int - 0 == success, else failure. */
620 /* Parameters: ap(I) - pointer to proxy structure */
621 /* */
622 /* Delete a proxy that has been added dynamically from those available. */
623 /* If it is in use, return 1 (do not destroy NOW), not in use 0 or -1 */
624 /* if it cannot be matched. */
625 /* ------------------------------------------------------------------------ */
626 int
ipf_proxy_del(aproxy_t * ap)627 ipf_proxy_del(aproxy_t *ap)
628 {
629 aproxy_t *a, **app;
630
631 for (app = &ap_proxylist; ((a = *app) != NULL); app = &a->apr_next) {
632 if (a == ap) {
633 a->apr_flags |= APR_DELETE;
634 if (ap->apr_ref == 0 && ap->apr_clones == 0) {
635 *app = a->apr_next;
636 return (0);
637 }
638 return (1);
639 }
640 }
641
642 return (-1);
643 }
644
645
646 /* ------------------------------------------------------------------------ */
647 /* Function: ipf_proxy_ok */
648 /* Returns: int - 1 == good match else not. */
649 /* Parameters: fin(I) - pointer to packet information */
650 /* tcp(I) - pointer to TCP/UDP header */
651 /* nat(I) - pointer to current NAT session */
652 /* */
653 /* This function extends the NAT matching to ensure that a packet that has */
654 /* arrived matches the proxy information attached to the NAT rule. Notably, */
655 /* if the proxy is scheduled to be deleted then packets will not match the */
656 /* rule even if the rule is still active. */
657 /* ------------------------------------------------------------------------ */
658 int
ipf_proxy_ok(fr_info_t * fin,tcphdr_t * tcp,ipnat_t * np)659 ipf_proxy_ok(fr_info_t *fin, tcphdr_t *tcp, ipnat_t *np)
660 {
661 aproxy_t *apr = np->in_apr;
662 u_short dport = np->in_odport;
663
664 if ((apr == NULL) || (apr->apr_flags & APR_DELETE) ||
665 (fin->fin_p != apr->apr_p))
666 return (0);
667 if ((tcp == NULL) && dport)
668 return (0);
669 return (1);
670 }
671
672
673 /* ------------------------------------------------------------------------ */
674 /* Function: ipf_proxy_ioctl */
675 /* Returns: int - 0 == success, else error */
676 /* Parameters: softc(I) - pointer to soft context main structure */
677 /* data(I) - pointer to ioctl data */
678 /* cmd(I) - ioctl command */
679 /* mode(I) - mode bits for device */
680 /* ctx(I) - pointer to context information */
681 /* */
682 /* ------------------------------------------------------------------------ */
683 int
ipf_proxy_ioctl(ipf_main_softc_t * softc,caddr_t data,ioctlcmd_t cmd,int mode,void * ctx)684 ipf_proxy_ioctl(ipf_main_softc_t *softc, caddr_t data, ioctlcmd_t cmd,
685 int mode, void *ctx)
686 {
687 ap_ctl_t ctl;
688 caddr_t ptr;
689 int error;
690
691 mode = mode; /* LINT */
692
693 switch (cmd)
694 {
695 case SIOCPROXY :
696 error = ipf_inobj(softc, data, NULL, &ctl, IPFOBJ_PROXYCTL);
697 if (error != 0) {
698 return (error);
699 }
700 ptr = NULL;
701
702 if (ctl.apc_dsize > 0) {
703 KMALLOCS(ptr, caddr_t, ctl.apc_dsize);
704 if (ptr == NULL) {
705 IPFERROR(80003);
706 error = ENOMEM;
707 } else {
708 error = copyinptr(softc, ctl.apc_data, ptr,
709 ctl.apc_dsize);
710 if (error == 0)
711 ctl.apc_data = ptr;
712 }
713 } else {
714 ctl.apc_data = NULL;
715 error = 0;
716 }
717
718 if (error == 0)
719 error = ipf_proxy_ctl(softc, softc->ipf_proxy_soft,
720 &ctl);
721
722 if ((error != 0) && (ptr != NULL)) {
723 KFREES(ptr, ctl.apc_dsize);
724 }
725 break;
726
727 default :
728 IPFERROR(80004);
729 error = EINVAL;
730 }
731 return (error);
732 }
733
734
735 /* ------------------------------------------------------------------------ */
736 /* Function: ipf_proxy_match */
737 /* Returns: int - 0 == success, else error */
738 /* Parameters: fin(I) - pointer to packet information */
739 /* nat(I) - pointer to current NAT session */
740 /* */
741 /* If a proxy has a match function, call that to do extended packet */
742 /* matching. Whilst other parts of the NAT code are rather lenient when it */
743 /* comes to the quality of the packet that it will transform, the proxy */
744 /* matching is not because they need to work with data, not just headers. */
745 /* ------------------------------------------------------------------------ */
746 int
ipf_proxy_match(fr_info_t * fin,nat_t * nat)747 ipf_proxy_match(fr_info_t *fin, nat_t *nat)
748 {
749 ipf_main_softc_t *softc = fin->fin_main_soft;
750 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
751 aproxy_t *apr;
752 ipnat_t *ipn;
753 int result;
754
755 ipn = nat->nat_ptr;
756 if (softp->ips_proxy_debug & 0x04)
757 printf("ipf_proxy_match(%lx,%lx) aps %lx ptr %lx\n",
758 (u_long)fin, (u_long)nat, (u_long)nat->nat_aps,
759 (u_long)ipn);
760
761 if ((fin->fin_flx & (FI_SHORT|FI_BAD)) != 0) {
762 if (softp->ips_proxy_debug & 0x08)
763 printf("ipf_proxy_match: flx 0x%x (BAD|SHORT)\n",
764 fin->fin_flx);
765 return (-1);
766 }
767
768 apr = ipn->in_apr;
769 if ((apr == NULL) || (apr->apr_flags & APR_DELETE)) {
770 if (softp->ips_proxy_debug & 0x08)
771 printf("ipf_proxy_match:apr %lx apr_flags 0x%x\n",
772 (u_long)apr, apr ? apr->apr_flags : 0);
773 return (-1);
774 }
775
776 if (apr->apr_match != NULL) {
777 result = (*apr->apr_match)(fin, nat->nat_aps, nat);
778 if (result != 0) {
779 if (softp->ips_proxy_debug & 0x08)
780 printf("ipf_proxy_match: result %d\n", result);
781 return (-1);
782 }
783 }
784 return (0);
785 }
786
787
788 /* ------------------------------------------------------------------------ */
789 /* Function: ipf_proxy_new */
790 /* Returns: int - 0 == success, else error */
791 /* Parameters: fin(I) - pointer to packet information */
792 /* nat(I) - pointer to current NAT session */
793 /* */
794 /* Allocate a new application proxy structure and fill it in with the */
795 /* relevant details. call the init function once complete, prior to */
796 /* returning. */
797 /* ------------------------------------------------------------------------ */
798 int
ipf_proxy_new(fr_info_t * fin,nat_t * nat)799 ipf_proxy_new(fr_info_t *fin, nat_t *nat)
800 {
801 ipf_main_softc_t *softc = fin->fin_main_soft;
802 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
803 register ap_session_t *aps;
804 aproxy_t *apr;
805
806 if (softp->ips_proxy_debug & 0x04)
807 printf("ipf_proxy_new(%lx,%lx) \n", (u_long)fin, (u_long)nat);
808
809 if ((nat->nat_ptr == NULL) || (nat->nat_aps != NULL)) {
810 if (softp->ips_proxy_debug & 0x08)
811 printf("ipf_proxy_new: nat_ptr %lx nat_aps %lx\n",
812 (u_long)nat->nat_ptr, (u_long)nat->nat_aps);
813 return (-1);
814 }
815
816 apr = nat->nat_ptr->in_apr;
817
818 if ((apr->apr_flags & APR_DELETE) ||
819 (fin->fin_p != apr->apr_p)) {
820 if (softp->ips_proxy_debug & 0x08)
821 printf("ipf_proxy_new: apr_flags 0x%x p %d/%d\n",
822 apr->apr_flags, fin->fin_p, apr->apr_p);
823 return (-1);
824 }
825
826 KMALLOC(aps, ap_session_t *);
827 if (!aps) {
828 if (softp->ips_proxy_debug & 0x08)
829 printf("ipf_proxy_new: malloc failed (%lu)\n",
830 (u_long)sizeof(ap_session_t));
831 return (-1);
832 }
833
834 bzero((char *)aps, sizeof(*aps));
835 aps->aps_data = NULL;
836 aps->aps_apr = apr;
837 aps->aps_psiz = 0;
838 if (apr->apr_new != NULL)
839 if ((*apr->apr_new)(apr->apr_soft, fin, aps, nat) == -1) {
840 if ((aps->aps_data != NULL) && (aps->aps_psiz != 0)) {
841 KFREES(aps->aps_data, aps->aps_psiz);
842 }
843 KFREE(aps);
844 if (softp->ips_proxy_debug & 0x08)
845 printf("ipf_proxy_new: new(%lx) failed\n",
846 (u_long)apr->apr_new);
847 return (-1);
848 }
849 aps->aps_nat = nat;
850 aps->aps_next = softp->ips_sess_list;
851 softp->ips_sess_list = aps;
852 nat->nat_aps = aps;
853
854 return (0);
855 }
856
857
858 /* ------------------------------------------------------------------------ */
859 /* Function: ipf_proxy_check */
860 /* Returns: int - -1 == error, 1 == success */
861 /* Parameters: fin(I) - pointer to packet information */
862 /* nat(I) - pointer to current NAT session */
863 /* */
864 /* Check to see if a packet should be passed through an active proxy */
865 /* routine if one has been setup for it. We don't need to check the */
866 /* checksum here if IPFILTER_CKSUM is defined because if it is, a failed */
867 /* check causes FI_BAD to be set. */
868 /* ------------------------------------------------------------------------ */
869 int
ipf_proxy_check(fr_info_t * fin,nat_t * nat)870 ipf_proxy_check(fr_info_t *fin, nat_t *nat)
871 {
872 ipf_main_softc_t *softc = fin->fin_main_soft;
873 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
874 #if SOLARIS && defined(_KERNEL) && defined(ICK_VALID)
875 mb_t *m;
876 #endif
877 tcphdr_t *tcp = NULL;
878 udphdr_t *udp = NULL;
879 ap_session_t *aps;
880 aproxy_t *apr;
881 short adjlen;
882 int dosum;
883 ip_t *ip;
884 short rv;
885 int err;
886 #if !defined(_KERNEL) || SOLARIS || defined(__FreeBSD__)
887 u_32_t s1, s2, sd;
888 #endif
889
890 if (fin->fin_flx & FI_BAD) {
891 if (softp->ips_proxy_debug & 0x08)
892 printf("ipf_proxy_check: flx 0x%x (BAD)\n",
893 fin->fin_flx);
894 return (-1);
895 }
896
897 #ifndef IPFILTER_CKSUM
898 if ((fin->fin_out == 0) && (ipf_checkl4sum(fin) == -1)) {
899 if (softp->ips_proxy_debug & 0x08)
900 printf("ipf_proxy_check: l4 checksum failure %d\n",
901 fin->fin_p);
902 if (fin->fin_p == IPPROTO_TCP)
903 softc->ipf_stats[fin->fin_out].fr_tcpbad++;
904 return (-1);
905 }
906 #endif
907
908 aps = nat->nat_aps;
909 if (aps != NULL) {
910 /*
911 * If there is data in this packet to be proxied then try and
912 * get it all into the one buffer, else drop it.
913 */
914 #if SOLARIS || defined(HAVE_M_PULLDOWN)
915 if ((fin->fin_dlen > 0) && !(fin->fin_flx & FI_COALESCE))
916 if (ipf_coalesce(fin) == -1) {
917 if (softp->ips_proxy_debug & 0x08)
918 printf("ipf_proxy_check: %s %x\n",
919 "coalesce failed", fin->fin_flx);
920 return (-1);
921 }
922 #endif
923 ip = fin->fin_ip;
924 if (fin->fin_cksum > FI_CK_SUMOK)
925 dosum = 0;
926 else
927 dosum = 1;
928
929 switch (fin->fin_p)
930 {
931 case IPPROTO_TCP :
932 tcp = (tcphdr_t *)fin->fin_dp;
933 #if SOLARIS && defined(_KERNEL) && defined(ICK_VALID)
934 m = fin->fin_qfm;
935 if (dohwcksum && (m->b_ick_flag == ICK_VALID))
936 dosum = 0;
937 #endif
938 break;
939 case IPPROTO_UDP :
940 udp = (udphdr_t *)fin->fin_dp;
941 break;
942 default :
943 break;
944 }
945
946 apr = aps->aps_apr;
947 err = 0;
948 if (fin->fin_out != 0) {
949 if (apr->apr_outpkt != NULL)
950 err = (*apr->apr_outpkt)(apr->apr_soft, fin,
951 aps, nat);
952 } else {
953 if (apr->apr_inpkt != NULL)
954 err = (*apr->apr_inpkt)(apr->apr_soft, fin,
955 aps, nat);
956 }
957
958 rv = APR_EXIT(err);
959 if (((softp->ips_proxy_debug & 0x08) && (rv != 0)) ||
960 (softp->ips_proxy_debug & 0x04))
961 printf("ipf_proxy_check: out %d err %x rv %d\n",
962 fin->fin_out, err, rv);
963 if (rv == 1)
964 return (-1);
965
966 if (rv == 2) {
967 ipf_proxy_deref(apr);
968 nat->nat_aps = NULL;
969 return (-1);
970 }
971
972 /*
973 * If err != 0 then the data size of the packet has changed
974 * so we need to recalculate the header checksums for the
975 * packet.
976 */
977 adjlen = APR_INC(err);
978 #if !defined(_KERNEL) || SOLARIS || defined(__FreeBSD__)
979 s1 = LONG_SUM(fin->fin_plen - adjlen);
980 s2 = LONG_SUM(fin->fin_plen);
981 CALC_SUMD(s1, s2, sd);
982 if ((err != 0) && (fin->fin_cksum < FI_CK_L4PART) &&
983 fin->fin_v == 4)
984 ipf_fix_outcksum(0, &ip->ip_sum, sd, 0);
985 #endif
986 if (fin->fin_flx & FI_DOCKSUM)
987 dosum = 1;
988
989 /*
990 * For TCP packets, we may need to adjust the sequence and
991 * acknowledgement numbers to reflect changes in size of the
992 * data stream.
993 *
994 * For both TCP and UDP, recalculate the layer 4 checksum,
995 * regardless, as we can't tell (here) if data has been
996 * changed or not.
997 */
998 if (tcp != NULL) {
999 err = ipf_proxy_fixseqack(fin, ip, aps, adjlen);
1000 if (fin->fin_cksum == FI_CK_L4PART) {
1001 u_short sum = ntohs(tcp->th_sum);
1002 sum += adjlen;
1003 tcp->th_sum = htons(sum);
1004 } else if (fin->fin_cksum < FI_CK_L4PART) {
1005 tcp->th_sum = fr_cksum(fin, ip,
1006 IPPROTO_TCP, tcp);
1007 }
1008 } else if ((udp != NULL) && (udp->uh_sum != 0)) {
1009 if (fin->fin_cksum == FI_CK_L4PART) {
1010 u_short sum = ntohs(udp->uh_sum);
1011 sum += adjlen;
1012 udp->uh_sum = htons(sum);
1013 } else if (dosum) {
1014 udp->uh_sum = fr_cksum(fin, ip,
1015 IPPROTO_UDP, udp);
1016 }
1017 }
1018 aps->aps_bytes += fin->fin_plen;
1019 aps->aps_pkts++;
1020 }
1021 return (1);
1022 }
1023
1024
1025 /* ------------------------------------------------------------------------ */
1026 /* Function: ipf_proxy_lookup */
1027 /* Returns: int - -1 == error, 0 == success */
1028 /* Parameters: arg(I) - pointer to proxy context information */
1029 /* pr(I) - protocol number for proxy */
1030 /* name(I) - proxy name */
1031 /* */
1032 /* Search for a proxy by the protocol being used and by its name. */
1033 /* ------------------------------------------------------------------------ */
1034 aproxy_t *
ipf_proxy_lookup(void * arg,u_int pr,char * name)1035 ipf_proxy_lookup(void *arg, u_int pr, char *name)
1036 {
1037 ipf_proxy_softc_t *softp = arg;
1038 aproxy_t *ap;
1039
1040 if (softp->ips_proxy_debug & 0x04)
1041 printf("ipf_proxy_lookup(%d,%s)\n", pr, name);
1042
1043 for (ap = softp->ips_proxies; ap != NULL; ap = ap->apr_next)
1044 if ((ap->apr_p == pr) &&
1045 !strncmp(name, ap->apr_label, sizeof(ap->apr_label))) {
1046 ap->apr_ref++;
1047 return (ap);
1048 }
1049
1050 if (softp->ips_proxy_debug & 0x08)
1051 printf("ipf_proxy_lookup: failed for %d/%s\n", pr, name);
1052 return (NULL);
1053 }
1054
1055
1056 /* ------------------------------------------------------------------------ */
1057 /* Function: ipf_proxy_deref */
1058 /* Returns: Nil */
1059 /* Parameters: ap(I) - pointer to proxy structure */
1060 /* */
1061 /* Drop the reference counter associated with the proxy. */
1062 /* ------------------------------------------------------------------------ */
1063 void
ipf_proxy_deref(aproxy_t * ap)1064 ipf_proxy_deref(aproxy_t *ap)
1065 {
1066 ap->apr_ref--;
1067 }
1068
1069
1070 /* ------------------------------------------------------------------------ */
1071 /* Function: ipf_proxy_free */
1072 /* Returns: Nil */
1073 /* Parameters: softc(I) - pointer to soft context main structure */
1074 /* aps(I) - pointer to current proxy session */
1075 /* Locks Held: ipf_nat_new, ipf_nat(W) */
1076 /* */
1077 /* Free up proxy session information allocated to be used with a NAT */
1078 /* session. */
1079 /* ------------------------------------------------------------------------ */
1080 void
ipf_proxy_free(ipf_main_softc_t * softc,ap_session_t * aps)1081 ipf_proxy_free(ipf_main_softc_t *softc, ap_session_t *aps)
1082 {
1083 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
1084 ap_session_t *a, **ap;
1085 aproxy_t *apr;
1086
1087 if (!aps)
1088 return;
1089
1090 for (ap = &softp->ips_sess_list; ((a = *ap) != NULL); ap = &a->aps_next)
1091 if (a == aps) {
1092 *ap = a->aps_next;
1093 break;
1094 }
1095
1096 apr = aps->aps_apr;
1097 if ((apr != NULL) && (apr->apr_del != NULL))
1098 (*apr->apr_del)(softc, aps);
1099
1100 if ((aps->aps_data != NULL) && (aps->aps_psiz != 0))
1101 KFREES(aps->aps_data, aps->aps_psiz);
1102 KFREE(aps);
1103 }
1104
1105
1106 /* ------------------------------------------------------------------------ */
1107 /* Function: ipf_proxy_fixseqack */
1108 /* Returns: int - 2 if TCP ack/seq is changed, else 0 */
1109 /* Parameters: fin(I) - pointer to packet information */
1110 /* ip(I) - pointer to IP header */
1111 /* nat(I) - pointer to current NAT session */
1112 /* inc(I) - delta to apply to TCP sequence numbering */
1113 /* */
1114 /* Adjust the TCP sequence/acknowledge numbers in the TCP header based on */
1115 /* whether or not the new header is past the point at which an adjustment */
1116 /* occurred. This might happen because of (say) an FTP string being changed */
1117 /* and the new string being a different length to the old. */
1118 /* ------------------------------------------------------------------------ */
1119 static int
ipf_proxy_fixseqack(fr_info_t * fin,ip_t * ip,ap_session_t * aps,int inc)1120 ipf_proxy_fixseqack(fr_info_t *fin, ip_t *ip, ap_session_t *aps, int inc)
1121 {
1122 ipf_main_softc_t *softc = fin->fin_main_soft;
1123 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
1124 int sel, ch = 0, out, nlen;
1125 u_32_t seq1, seq2;
1126 tcphdr_t *tcp;
1127 short inc2;
1128
1129 tcp = (tcphdr_t *)fin->fin_dp;
1130 out = fin->fin_out;
1131 /*
1132 * ip_len has already been adjusted by 'inc'.
1133 */
1134 nlen = fin->fin_dlen;
1135 nlen -= (TCP_OFF(tcp) << 2);
1136
1137 inc2 = inc;
1138 inc = (int)inc2;
1139
1140 if (out != 0) {
1141 seq1 = (u_32_t)ntohl(tcp->th_seq);
1142 sel = aps->aps_sel[out];
1143
1144 /* switch to other set ? */
1145 if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) &&
1146 (seq1 > aps->aps_seqmin[!sel])) {
1147 if (softp->ips_proxy_debug & 0x10)
1148 printf("proxy out switch set seq %d -> %d %x > %x\n",
1149 sel, !sel, seq1,
1150 aps->aps_seqmin[!sel]);
1151 sel = aps->aps_sel[out] = !sel;
1152 }
1153
1154 if (aps->aps_seqoff[sel]) {
1155 seq2 = aps->aps_seqmin[sel] - aps->aps_seqoff[sel];
1156 if (seq1 > seq2) {
1157 seq2 = aps->aps_seqoff[sel];
1158 seq1 += seq2;
1159 tcp->th_seq = htonl(seq1);
1160 ch = 1;
1161 }
1162 }
1163
1164 if (inc && (seq1 > aps->aps_seqmin[!sel])) {
1165 aps->aps_seqmin[sel] = seq1 + nlen - 1;
1166 aps->aps_seqoff[sel] = aps->aps_seqoff[sel] + inc;
1167 if (softp->ips_proxy_debug & 0x10)
1168 printf("proxy seq set %d at %x to %d + %d\n",
1169 sel, aps->aps_seqmin[sel],
1170 aps->aps_seqoff[sel], inc);
1171 }
1172
1173 /***/
1174
1175 seq1 = ntohl(tcp->th_ack);
1176 sel = aps->aps_sel[1 - out];
1177
1178 /* switch to other set ? */
1179 if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) &&
1180 (seq1 > aps->aps_ackmin[!sel])) {
1181 if (softp->ips_proxy_debug & 0x10)
1182 printf("proxy out switch set ack %d -> %d %x > %x\n",
1183 sel, !sel, seq1,
1184 aps->aps_ackmin[!sel]);
1185 sel = aps->aps_sel[1 - out] = !sel;
1186 }
1187
1188 if (aps->aps_ackoff[sel] && (seq1 > aps->aps_ackmin[sel])) {
1189 seq2 = aps->aps_ackoff[sel];
1190 tcp->th_ack = htonl(seq1 - seq2);
1191 ch = 1;
1192 }
1193 } else {
1194 seq1 = ntohl(tcp->th_seq);
1195 sel = aps->aps_sel[out];
1196
1197 /* switch to other set ? */
1198 if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) &&
1199 (seq1 > aps->aps_ackmin[!sel])) {
1200 if (softp->ips_proxy_debug & 0x10)
1201 printf("proxy in switch set ack %d -> %d %x > %x\n",
1202 sel, !sel, seq1, aps->aps_ackmin[!sel]);
1203 sel = aps->aps_sel[out] = !sel;
1204 }
1205
1206 if (aps->aps_ackoff[sel]) {
1207 seq2 = aps->aps_ackmin[sel] - aps->aps_ackoff[sel];
1208 if (seq1 > seq2) {
1209 seq2 = aps->aps_ackoff[sel];
1210 seq1 += seq2;
1211 tcp->th_seq = htonl(seq1);
1212 ch = 1;
1213 }
1214 }
1215
1216 if (inc && (seq1 > aps->aps_ackmin[!sel])) {
1217 aps->aps_ackmin[!sel] = seq1 + nlen - 1;
1218 aps->aps_ackoff[!sel] = aps->aps_ackoff[sel] + inc;
1219
1220 if (softp->ips_proxy_debug & 0x10)
1221 printf("proxy ack set %d at %x to %d + %d\n",
1222 !sel, aps->aps_seqmin[!sel],
1223 aps->aps_seqoff[sel], inc);
1224 }
1225
1226 /***/
1227
1228 seq1 = ntohl(tcp->th_ack);
1229 sel = aps->aps_sel[1 - out];
1230
1231 /* switch to other set ? */
1232 if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) &&
1233 (seq1 > aps->aps_seqmin[!sel])) {
1234 if (softp->ips_proxy_debug & 0x10)
1235 printf("proxy in switch set seq %d -> %d %x > %x\n",
1236 sel, !sel, seq1, aps->aps_seqmin[!sel]);
1237 sel = aps->aps_sel[1 - out] = !sel;
1238 }
1239
1240 if (aps->aps_seqoff[sel] != 0) {
1241 if (softp->ips_proxy_debug & 0x10)
1242 printf("sel %d seqoff %d seq1 %x seqmin %x\n",
1243 sel, aps->aps_seqoff[sel], seq1,
1244 aps->aps_seqmin[sel]);
1245 if (seq1 > aps->aps_seqmin[sel]) {
1246 seq2 = aps->aps_seqoff[sel];
1247 tcp->th_ack = htonl(seq1 - seq2);
1248 ch = 1;
1249 }
1250 }
1251 }
1252
1253 if (softp->ips_proxy_debug & 0x10)
1254 printf("ipf_proxy_fixseqack: seq %u ack %u\n",
1255 (u_32_t)ntohl(tcp->th_seq), (u_32_t)ntohl(tcp->th_ack));
1256 return (ch ? 2 : 0);
1257 }
1258
1259
1260 /* ------------------------------------------------------------------------ */
1261 /* Function: ipf_proxy_rule_rev */
1262 /* Returns: ipnat_t * - NULL = failure, else pointer to new rule */
1263 /* Parameters: nat(I) - pointer to NAT session to create rule from */
1264 /* */
1265 /* This function creates a NAT rule that is based upon the reverse packet */
1266 /* flow associated with this NAT session. Thus if this NAT session was */
1267 /* created with a map rule then this function will create a rdr rule. */
1268 /* Only address fields and network interfaces are assigned in this function */
1269 /* and the address fields are formed such that an exact is required. If the */
1270 /* original rule had a netmask, that is not replicated here not is it */
1271 /* desired. The ultimate goal here is to create a NAT rule to support a NAT */
1272 /* session being created that does not have a user configured rule. The */
1273 /* classic example is supporting the FTP proxy, where a data channel needs */
1274 /* to be setup, based on the addresses used for the control connection. In */
1275 /* that case, this function is used to handle creating NAT rules to support */
1276 /* data connections with the PORT and EPRT commands. */
1277 /* ------------------------------------------------------------------------ */
1278 ipnat_t *
ipf_proxy_rule_rev(nat_t * nat)1279 ipf_proxy_rule_rev(nat_t *nat)
1280 {
1281 ipnat_t *old;
1282 ipnat_t *ipn;
1283 int size;
1284
1285 old = nat->nat_ptr;
1286 size = old->in_size;
1287
1288 KMALLOCS(ipn, ipnat_t *, size);
1289 if (ipn == NULL)
1290 return (NULL);
1291
1292 bzero((char *)ipn, size);
1293
1294 ipn->in_use = 1;
1295 ipn->in_hits = 1;
1296 ipn->in_ippip = 1;
1297 ipn->in_apr = NULL;
1298 ipn->in_size = size;
1299 ipn->in_pr[0] = old->in_pr[1];
1300 ipn->in_pr[1] = old->in_pr[0];
1301 ipn->in_v[0] = old->in_v[1];
1302 ipn->in_v[1] = old->in_v[0];
1303 ipn->in_ifps[0] = old->in_ifps[1];
1304 ipn->in_ifps[1] = old->in_ifps[0];
1305 ipn->in_flags = (old->in_flags | IPN_PROXYRULE);
1306
1307 ipn->in_nsrcip6 = nat->nat_odst6;
1308 ipn->in_osrcip6 = nat->nat_ndst6;
1309
1310 if ((old->in_redir & NAT_REDIRECT) != 0) {
1311 ipn->in_redir = NAT_MAP;
1312 if (ipn->in_v[0] == 4) {
1313 ipn->in_snip = ntohl(nat->nat_odstaddr);
1314 ipn->in_dnip = ntohl(nat->nat_nsrcaddr);
1315 #ifdef USE_INET6
1316 } else {
1317 ipn->in_snip6 = nat->nat_odst6;
1318 ipn->in_dnip6 = nat->nat_nsrc6;
1319 #endif
1320 }
1321 ipn->in_ndstip6 = nat->nat_nsrc6;
1322 ipn->in_odstip6 = nat->nat_osrc6;
1323 } else {
1324 ipn->in_redir = NAT_REDIRECT;
1325 if (ipn->in_v[0] == 4) {
1326 ipn->in_snip = ntohl(nat->nat_odstaddr);
1327 ipn->in_dnip = ntohl(nat->nat_osrcaddr);
1328 #ifdef USE_INET6
1329 } else {
1330 ipn->in_snip6 = nat->nat_odst6;
1331 ipn->in_dnip6 = nat->nat_osrc6;
1332 #endif
1333 }
1334 ipn->in_ndstip6 = nat->nat_osrc6;
1335 ipn->in_odstip6 = nat->nat_nsrc6;
1336 }
1337
1338 IP6_SETONES(&ipn->in_osrcmsk6);
1339 IP6_SETONES(&ipn->in_nsrcmsk6);
1340 IP6_SETONES(&ipn->in_odstmsk6);
1341 IP6_SETONES(&ipn->in_ndstmsk6);
1342
1343 ipn->in_namelen = old->in_namelen;
1344 ipn->in_ifnames[0] = old->in_ifnames[1];
1345 ipn->in_ifnames[1] = old->in_ifnames[0];
1346 bcopy(old->in_names, ipn->in_names, ipn->in_namelen);
1347 MUTEX_INIT(&ipn->in_lock, "ipnat rev rule lock");
1348
1349 return (ipn);
1350 }
1351
1352
1353 /* ------------------------------------------------------------------------ */
1354 /* Function: ipf_proxy_rule_fwd */
1355 /* Returns: ipnat_t * - NULL = failure, else pointer to new rule */
1356 /* Parameters: nat(I) - pointer to NAT session to create rule from */
1357 /* */
1358 /* The purpose and rationale of this function is much the same as the above */
1359 /* function, ipf_proxy_rule_rev, except that a rule is created that matches */
1360 /* the same direction as that of the existing NAT session. Thus if this NAT */
1361 /* session was created with a map rule then this function will also create */
1362 /* a data structure to represent a map rule. Whereas ipf_proxy_rule_rev is */
1363 /* used to support PORT/EPRT, this function supports PASV/EPSV. */
1364 /* ------------------------------------------------------------------------ */
1365 ipnat_t *
ipf_proxy_rule_fwd(nat_t * nat)1366 ipf_proxy_rule_fwd(nat_t *nat)
1367 {
1368 ipnat_t *old;
1369 ipnat_t *ipn;
1370 int size;
1371
1372 old = nat->nat_ptr;
1373 size = old->in_size;
1374
1375 KMALLOCS(ipn, ipnat_t *, size);
1376 if (ipn == NULL)
1377 return (NULL);
1378
1379 bzero((char *)ipn, size);
1380
1381 ipn->in_use = 1;
1382 ipn->in_hits = 1;
1383 ipn->in_ippip = 1;
1384 ipn->in_apr = NULL;
1385 ipn->in_size = size;
1386 ipn->in_pr[0] = old->in_pr[0];
1387 ipn->in_pr[1] = old->in_pr[1];
1388 ipn->in_v[0] = old->in_v[0];
1389 ipn->in_v[1] = old->in_v[1];
1390 ipn->in_ifps[0] = nat->nat_ifps[0];
1391 ipn->in_ifps[1] = nat->nat_ifps[1];
1392 ipn->in_flags = (old->in_flags | IPN_PROXYRULE);
1393
1394 ipn->in_nsrcip6 = nat->nat_nsrc6;
1395 ipn->in_osrcip6 = nat->nat_osrc6;
1396 ipn->in_ndstip6 = nat->nat_ndst6;
1397 ipn->in_odstip6 = nat->nat_odst6;
1398 ipn->in_redir = old->in_redir;
1399
1400 if (ipn->in_v[0] == 4) {
1401 ipn->in_snip = ntohl(nat->nat_nsrcaddr);
1402 ipn->in_dnip = ntohl(nat->nat_ndstaddr);
1403 #ifdef USE_INET6
1404 } else {
1405 ipn->in_snip6 = nat->nat_nsrc6;
1406 ipn->in_dnip6 = nat->nat_ndst6;
1407 #endif
1408 }
1409
1410 IP6_SETONES(&ipn->in_osrcmsk6);
1411 IP6_SETONES(&ipn->in_nsrcmsk6);
1412 IP6_SETONES(&ipn->in_odstmsk6);
1413 IP6_SETONES(&ipn->in_ndstmsk6);
1414
1415 ipn->in_namelen = old->in_namelen;
1416 ipn->in_ifnames[0] = old->in_ifnames[0];
1417 ipn->in_ifnames[1] = old->in_ifnames[1];
1418 bcopy(old->in_names, ipn->in_names, ipn->in_namelen);
1419 MUTEX_INIT(&ipn->in_lock, "ipnat fwd rule lock");
1420
1421 return (ipn);
1422 }
1423