1 /* $NetBSD: ip_proxy.c,v 1.5 2012/07/22 16:34:04 darrenr Exp $ */
2
3 /*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 */
8 #if defined(KERNEL) || defined(_KERNEL)
9 # undef KERNEL
10 # undef _KERNEL
11 # define KERNEL 1
12 # define _KERNEL 1
13 #endif
14 #include <sys/errno.h>
15 #include <sys/types.h>
16 #include <sys/param.h>
17 #include <sys/time.h>
18 #include <sys/file.h>
19 #if !defined(AIX)
20 # include <sys/fcntl.h>
21 #endif
22 #if !defined(_KERNEL) && !defined(__KERNEL__)
23 # include <stdio.h>
24 # include <string.h>
25 # include <stdlib.h>
26 # include <ctype.h>
27 # define _KERNEL
28 # ifdef __OpenBSD__
29 struct file;
30 # endif
31 # include <sys/uio.h>
32 # undef _KERNEL
33 #endif
34 #if !defined(linux)
35 # include <sys/protosw.h>
36 #endif
37 #include <sys/socket.h>
38 #if defined(_KERNEL)
39 # if !defined(__NetBSD__) && !defined(sun) && !defined(__osf__) && \
40 !defined(__OpenBSD__) && !defined(__hpux) && !defined(__sgi) && \
41 !defined(AIX)
42 # include <sys/ctype.h>
43 # endif
44 # include <sys/systm.h>
45 # if !defined(__SVR4) && !defined(__svr4__)
46 # include <sys/mbuf.h>
47 # endif
48 #endif
49 #if defined(_KERNEL) && (__FreeBSD_version >= 220000)
50 # include <sys/filio.h>
51 # include <sys/fcntl.h>
52 #else
53 # include <sys/ioctl.h>
54 #endif
55 #if defined(__SVR4) || defined(__svr4__)
56 # include <sys/byteorder.h>
57 # ifdef _KERNEL
58 # include <sys/dditypes.h>
59 # endif
60 # include <sys/stream.h>
61 # include <sys/kmem.h>
62 #endif
63 #if __FreeBSD__ > 2
64 # include <sys/queue.h>
65 #endif
66 #include <net/if.h>
67 #ifdef sun
68 # include <net/af.h>
69 #endif
70 #include <netinet/in.h>
71 #include <netinet/in_systm.h>
72 #include <netinet/ip.h>
73 #ifndef linux
74 # include <netinet/ip_var.h>
75 #endif
76 #include <netinet/tcp.h>
77 #include <netinet/udp.h>
78 #include <netinet/ip_icmp.h>
79 #include "netinet/ip_compat.h"
80 #include <netinet/tcpip.h>
81 #include "netinet/ip_fil.h"
82 #include "netinet/ip_nat.h"
83 #include "netinet/ip_state.h"
84 #include "netinet/ip_proxy.h"
85 #if (__FreeBSD_version >= 300000)
86 # include <sys/malloc.h>
87 #endif
88
89 /* END OF INCLUDES */
90
91 #include "netinet/ip_dns_pxy.c"
92 #include "netinet/ip_ftp_pxy.c"
93 #include "netinet/ip_tftp_pxy.c"
94 #include "netinet/ip_rcmd_pxy.c"
95 #include "netinet/ip_pptp_pxy.c"
96 #if defined(_KERNEL)
97 # include "netinet/ip_irc_pxy.c"
98 # include "netinet/ip_raudio_pxy.c"
99 # include "netinet/ip_netbios_pxy.c"
100 #endif
101 #include "netinet/ip_ipsec_pxy.c"
102 #include "netinet/ip_rpcb_pxy.c"
103
104 #if !defined(lint)
105 #if defined(__NetBSD__)
106 #include <sys/cdefs.h>
107 __KERNEL_RCSID(0, "$NetBSD: ip_proxy.c,v 1.5 2012/07/22 16:34:04 darrenr Exp $");
108 #else
109 static const char rcsid[] = "@(#)Id: ip_proxy.c,v 1.1.1.2 2012/07/22 13:45:33 darrenr Exp";
110 #endif
111 #endif
112
113 #define AP_SESS_SIZE 53
114
115 static int ipf_proxy_fixseqack(fr_info_t *, ip_t *, ap_session_t *, int );
116 static aproxy_t *ipf_proxy_create_clone(ipf_main_softc_t *, aproxy_t *);
117
118 typedef struct ipf_proxy_softc_s {
119 int ips_proxy_debug;
120 int ips_proxy_session_size;
121 ap_session_t **ips_sess_tab;
122 ap_session_t *ips_sess_list;
123 aproxy_t *ips_proxies;
124 int ips_init_run;
125 ipftuneable_t *ipf_proxy_tune;
126 } ipf_proxy_softc_t;
127
128 static ipftuneable_t ipf_proxy_tuneables[] = {
129 { { (void *)offsetof(ipf_proxy_softc_t, ips_proxy_debug) },
130 "proxy_debug", 0, 0x1f,
131 stsizeof(ipf_proxy_softc_t, ips_proxy_debug),
132 0, NULL, NULL },
133 { { NULL }, NULL, 0, 0,
134 0,
135 0, NULL, NULL}
136 };
137
138 static aproxy_t *ap_proxylist = NULL;
139 static aproxy_t ips_proxies[] = {
140 #ifdef IPF_FTP_PROXY
141 { NULL, NULL, "ftp", (char)IPPROTO_TCP, 0, 0, 0,
142 ipf_p_ftp_main_load, ipf_p_ftp_main_unload,
143 ipf_p_ftp_soft_create, ipf_p_ftp_soft_destroy,
144 NULL, NULL,
145 ipf_p_ftp_new, ipf_p_ftp_del, ipf_p_ftp_in, ipf_p_ftp_out, NULL,
146 NULL, NULL, NULL, NULL },
147 #endif
148 #ifdef IPF_TFTP_PROXY
149 { NULL, NULL, "tftp", (char)IPPROTO_UDP, 0, 0, 0,
150 ipf_p_tftp_main_load, ipf_p_tftp_main_unload,
151 ipf_p_tftp_soft_create, ipf_p_tftp_soft_destroy,
152 NULL, NULL,
153 ipf_p_tftp_new, ipf_p_tftp_del,
154 ipf_p_tftp_in, ipf_p_tftp_out, NULL,
155 NULL, NULL, NULL, NULL },
156 #endif
157 #ifdef IPF_IRC_PROXY
158 { NULL, NULL, "irc", (char)IPPROTO_TCP, 0, 0, 0,
159 ipf_p_irc_main_load, ipf_p_irc_main_unload,
160 NULL, NULL,
161 NULL, NULL,
162 ipf_p_irc_new, NULL, NULL, ipf_p_irc_out, NULL,
163 NULL, NULL, NULL, NULL },
164 #endif
165 #ifdef IPF_RCMD_PROXY
166 { NULL, NULL, "rcmd", (char)IPPROTO_TCP, 0, 0, 0,
167 ipf_p_rcmd_main_load, ipf_p_rcmd_main_unload,
168 NULL, NULL,
169 NULL, NULL,
170 ipf_p_rcmd_new, ipf_p_rcmd_del,
171 ipf_p_rcmd_in, ipf_p_rcmd_out, NULL,
172 NULL, NULL, NULL, NULL },
173 #endif
174 #ifdef IPF_RAUDIO_PROXY
175 { NULL, NULL, "raudio", (char)IPPROTO_TCP, 0, 0, 0,
176 ipf_p_raudio_main_load, ipf_p_raudio_main_unload,
177 NULL, NULL,
178 NULL, NULL,
179 ipf_p_raudio_new, NULL, ipf_p_raudio_in, ipf_p_raudio_out, NULL,
180 NULL, NULL, NULL, NULL },
181 #endif
182 #ifdef IPF_MSNRPC_PROXY
183 { NULL, NULL, "msnrpc", (char)IPPROTO_TCP, 0, 0, 0,
184 ipf_p_msnrpc_init, ipf_p_msnrpc_fini,
185 NULL, NULL,
186 NULL, NULL,
187 ipf_p_msnrpc_new, NULL, ipf_p_msnrpc_in, ipf_p_msnrpc_out, NULL,
188 NULL, NULL, NULL, NULL },
189 #endif
190 #ifdef IPF_NETBIOS_PROXY
191 { NULL, NULL, "netbios", (char)IPPROTO_UDP, 0, 0, 0,
192 ipf_p_netbios_main_load, ipf_p_netbios_main_unload,
193 NULL, NULL,
194 NULL, NULL,
195 NULL, NULL, NULL, ipf_p_netbios_out, NULL,
196 NULL, NULL, NULL, NULL },
197 #endif
198 #ifdef IPF_IPSEC_PROXY
199 { NULL, NULL, "ipsec", (char)IPPROTO_UDP, 0, 0, 0,
200 NULL, NULL,
201 ipf_p_ipsec_soft_create, ipf_p_ipsec_soft_destroy,
202 ipf_p_ipsec_soft_init, ipf_p_ipsec_soft_fini,
203 ipf_p_ipsec_new, ipf_p_ipsec_del,
204 ipf_p_ipsec_inout, ipf_p_ipsec_inout, ipf_p_ipsec_match,
205 NULL, NULL, NULL, NULL },
206 #endif
207 #ifdef IPF_DNS_PROXY
208 { NULL, NULL, "dns", (char)IPPROTO_UDP, 0, 0, 0,
209 NULL, NULL,
210 ipf_p_dns_soft_create, ipf_p_dns_soft_destroy,
211 NULL, NULL,
212 ipf_p_dns_new, ipf_p_ipsec_del,
213 ipf_p_dns_inout, ipf_p_dns_inout, ipf_p_dns_match,
214 ipf_p_dns_ctl, NULL, NULL, NULL },
215 #endif
216 #ifdef IPF_PPTP_PROXY
217 { NULL, NULL, "pptp", (char)IPPROTO_TCP, 0, 0, 0,
218 ipf_p_pptp_main_load, ipf_p_pptp_main_unload,
219 NULL, NULL,
220 NULL, NULL,
221 ipf_p_pptp_new, ipf_p_pptp_del,
222 ipf_p_pptp_inout, ipf_p_pptp_inout, NULL,
223 NULL, NULL, NULL, NULL },
224 #endif
225 #ifdef IPF_H323_PROXY
226 { NULL, NULL, "h323", (char)IPPROTO_TCP, 0, 0, 0,
227 ipf_p_h323_main_load, ipf_p_h323_main_unload,
228 NULL, NULL,
229 NULL, NULL,
230 ipf_p_h323_new, ipf_p_h323_del,
231 ipf_p_h323_in, NULL, NULL,
232 NULL, NULL, NULL, NULL },
233 { NULL, NULL, "h245", (char)IPPROTO_TCP, 0, 0, 0, NULL, NULL,
234 NULL, NULL,
235 NULL, NULL,
236 ipf_p_h245_new, NULL,
237 NULL, ipf_p_h245_out, NULL,
238 NULL, NULL, NULL, NULL },
239 #endif
240 #ifdef IPF_RPCB_PROXY
241 # ifndef _KERNEL
242 { NULL, NULL, "rpcbt", (char)IPPROTO_TCP, 0, 0, 0,
243 NULL, NULL,
244 NULL, NULL,
245 NULL, NULL,
246 ipf_p_rpcb_new, ipf_p_rpcb_del,
247 ipf_p_rpcb_in, ipf_p_rpcb_out, NULL,
248 NULL, NULL, NULL, NULL },
249 # endif
250 { NULL, NULL, "rpcbu", (char)IPPROTO_UDP, 0, 0, 0,
251 ipf_p_rpcb_main_load, ipf_p_rpcb_main_unload,
252 NULL, NULL,
253 NULL, NULL,
254 ipf_p_rpcb_new, ipf_p_rpcb_del,
255 ipf_p_rpcb_in, ipf_p_rpcb_out, NULL,
256 NULL, NULL, NULL, NULL },
257 #endif
258 { NULL, NULL, "", '\0', 0, 0, 0,
259 NULL, NULL,
260 NULL, NULL,
261 NULL, NULL,
262 NULL, NULL,
263 NULL, NULL, NULL,
264 NULL, NULL, NULL, NULL }
265 };
266
267
268 /* ------------------------------------------------------------------------ */
269 /* Function: ipf_proxy_main_load */
270 /* Returns: int - 0 == success, else failure. */
271 /* Parameters: Nil */
272 /* */
273 /* Initialise hook for kernel application proxies. */
274 /* Call the initialise routine for all the compiled in kernel proxies. */
275 /* ------------------------------------------------------------------------ */
276 int
ipf_proxy_main_load(void)277 ipf_proxy_main_load(void)
278 {
279 aproxy_t *ap;
280
281 for (ap = ips_proxies; ap->apr_p; ap++) {
282 if (ap->apr_load != NULL)
283 (*ap->apr_load)();
284 }
285 return 0;
286 }
287
288
289 /* ------------------------------------------------------------------------ */
290 /* Function: ipf_proxy_main_unload */
291 /* Returns: int - 0 == success, else failure. */
292 /* Parameters: Nil */
293 /* */
294 /* Unload hook for kernel application proxies. */
295 /* Call the finialise routine for all the compiled in kernel proxies. */
296 /* ------------------------------------------------------------------------ */
297 int
ipf_proxy_main_unload(void)298 ipf_proxy_main_unload(void)
299 {
300 aproxy_t *ap;
301
302 for (ap = ips_proxies; ap->apr_p; ap++)
303 if (ap->apr_unload != NULL)
304 (*ap->apr_unload)();
305 for (ap = ap_proxylist; ap; ap = ap->apr_next)
306 if (ap->apr_unload != NULL)
307 (*ap->apr_unload)();
308
309 return 0;
310 }
311
312
313 /* ------------------------------------------------------------------------ */
314 /* Function: ipf_proxy_soft_create */
315 /* Returns: void * - */
316 /* Parameters: softc(I) - pointer to soft context main structure */
317 /* */
318 /* Build the structure to hold all of the run time data to support proxies. */
319 /* ------------------------------------------------------------------------ */
320 void *
ipf_proxy_soft_create(ipf_main_softc_t * softc)321 ipf_proxy_soft_create(ipf_main_softc_t *softc)
322 {
323 ipf_proxy_softc_t *softp;
324 aproxy_t *last;
325 aproxy_t *apn;
326 aproxy_t *ap;
327
328 KMALLOC(softp, ipf_proxy_softc_t *);
329 if (softp == NULL)
330 return softp;
331
332 bzero((char *)softp, sizeof(*softp));
333
334 #if defined(_KERNEL)
335 softp->ips_proxy_debug = 0;
336 #else
337 softp->ips_proxy_debug = 2;
338 #endif
339 softp->ips_proxy_session_size = AP_SESS_SIZE;
340
341 softp->ipf_proxy_tune = ipf_tune_array_copy(softp,
342 sizeof(ipf_proxy_tuneables),
343 ipf_proxy_tuneables);
344 if (softp->ipf_proxy_tune == NULL) {
345 ipf_proxy_soft_destroy(softc, softp);
346 return NULL;
347 }
348 if (ipf_tune_array_link(softc, softp->ipf_proxy_tune) == -1) {
349 ipf_proxy_soft_destroy(softc, softp);
350 return NULL;
351 }
352
353 last = NULL;
354 for (ap = ips_proxies; ap->apr_p; ap++) {
355 apn = ipf_proxy_create_clone(softc, ap);
356 if (apn == NULL)
357 goto failed;
358 if (last != NULL)
359 last->apr_next = apn;
360 else
361 softp->ips_proxies = apn;
362 last = apn;
363 }
364 for (ap = ips_proxies; ap != NULL; ap = ap->apr_next) {
365 apn = ipf_proxy_create_clone(softc, ap);
366 if (apn == NULL)
367 goto failed;
368 if (last != NULL)
369 last->apr_next = apn;
370 else
371 softp->ips_proxies = apn;
372 last = apn;
373 }
374
375 return softp;
376 failed:
377 ipf_proxy_soft_destroy(softc, softp);
378 return NULL;
379 }
380
381
382 /* ------------------------------------------------------------------------ */
383 /* Function: ipf_proxy_soft_create */
384 /* Returns: void * - */
385 /* Parameters: softc(I) - pointer to soft context main structure */
386 /* orig(I) - pointer to proxy definition to copy */
387 /* */
388 /* This function clones a proxy definition given by orig and returns a */
389 /* a pointer to that copy. */
390 /* ------------------------------------------------------------------------ */
391 static aproxy_t *
ipf_proxy_create_clone(ipf_main_softc_t * softc,aproxy_t * orig)392 ipf_proxy_create_clone(ipf_main_softc_t *softc, aproxy_t *orig)
393 {
394 aproxy_t *apn;
395
396 KMALLOC(apn, aproxy_t *);
397 if (apn == NULL)
398 return NULL;
399
400 bcopy((char *)orig, (char *)apn, sizeof(*apn));
401 apn->apr_next = NULL;
402 apn->apr_soft = NULL;
403
404 if (apn->apr_create != NULL) {
405 apn->apr_soft = (*apn->apr_create)(softc);
406 if (apn->apr_soft == NULL) {
407 KFREE(apn);
408 return NULL;
409 }
410 }
411
412 apn->apr_parent = orig;
413 orig->apr_clones++;
414
415 return apn;
416 }
417
418
419 /* ------------------------------------------------------------------------ */
420 /* Function: ipf_proxy_soft_create */
421 /* Returns: int - 0 == success, else failure. */
422 /* Parameters: softc(I) - pointer to soft context main structure */
423 /* arg(I) - pointer to proxy contect data */
424 /* */
425 /* Initialise the proxy context and walk through each of the proxies and */
426 /* call its initialisation function. This allows for proxies to do any */
427 /* local setup prior to actual use. */
428 /* ------------------------------------------------------------------------ */
429 int
ipf_proxy_soft_init(ipf_main_softc_t * softc,void * arg)430 ipf_proxy_soft_init(ipf_main_softc_t *softc, void *arg)
431 {
432 ipf_proxy_softc_t *softp;
433 aproxy_t *ap;
434 u_int size;
435 int err;
436
437 softp = arg;
438 size = softp->ips_proxy_session_size * sizeof(ap_session_t *);
439
440 KMALLOCS(softp->ips_sess_tab, ap_session_t **, size);
441
442 if (softp->ips_sess_tab == NULL)
443 return -1;
444
445 bzero(softp->ips_sess_tab, size);
446
447 for (ap = softp->ips_proxies; ap != NULL; ap = ap->apr_next) {
448 if (ap->apr_init != NULL) {
449 err = (*ap->apr_init)(softc, ap->apr_soft);
450 if (err != 0)
451 return -2;
452 }
453 }
454 softp->ips_init_run = 1;
455
456 return 0;
457 }
458
459
460 /* ------------------------------------------------------------------------ */
461 /* Function: ipf_proxy_soft_create */
462 /* Returns: int - 0 == success, else failure. */
463 /* Parameters: softc(I) - pointer to soft context main structure */
464 /* arg(I) - pointer to proxy contect data */
465 /* */
466 /* This function should always succeed. It is responsible for ensuring that */
467 /* the proxy context can be safely called when ipf_proxy_soft_destroy is */
468 /* called and suring all of the proxies have similarly been instructed. */
469 /* ------------------------------------------------------------------------ */
470 int
ipf_proxy_soft_fini(ipf_main_softc_t * softc,void * arg)471 ipf_proxy_soft_fini(ipf_main_softc_t *softc, void *arg)
472 {
473 ipf_proxy_softc_t *softp = arg;
474 aproxy_t *ap;
475
476 for (ap = softp->ips_proxies; ap != NULL; ap = ap->apr_next) {
477 if (ap->apr_fini != NULL) {
478 (*ap->apr_fini)(softc, ap->apr_soft);
479 }
480 }
481
482 if (softp->ips_sess_tab != NULL) {
483 KFREES(softp->ips_sess_tab,
484 softp->ips_proxy_session_size * sizeof(ap_session_t *));
485 softp->ips_sess_tab = NULL;
486 }
487 softp->ips_init_run = 0;
488
489 return 0;
490 }
491
492
493 /* ------------------------------------------------------------------------ */
494 /* Function: ipf_proxy_soft_destroy */
495 /* Returns: Nil */
496 /* Parameters: softc(I) - pointer to soft context main structure */
497 /* arg(I) - pointer to proxy contect data */
498 /* */
499 /* Free up all of the local data structures allocated during creation. */
500 /* ------------------------------------------------------------------------ */
501 void
ipf_proxy_soft_destroy(ipf_main_softc_t * softc,void * arg)502 ipf_proxy_soft_destroy(ipf_main_softc_t *softc, void *arg)
503 {
504 ipf_proxy_softc_t *softp = arg;
505 aproxy_t *ap;
506
507 while ((ap = softp->ips_proxies) != NULL) {
508 softp->ips_proxies = ap->apr_next;
509 if (ap->apr_destroy != NULL)
510 (*ap->apr_destroy)(softc, ap->apr_soft);
511 ap->apr_parent->apr_clones--;
512 KFREE(ap);
513 }
514
515 if (softp->ipf_proxy_tune != NULL) {
516 ipf_tune_array_unlink(softc, softp->ipf_proxy_tune);
517 KFREES(softp->ipf_proxy_tune, sizeof(ipf_proxy_tuneables));
518 softp->ipf_proxy_tune = NULL;
519 }
520
521 KFREE(softp);
522 }
523
524
525 /* ------------------------------------------------------------------------ */
526 /* Function: ipf_proxy_flush */
527 /* Returns: Nil */
528 /* Parameters: arg(I) - pointer to proxy contect data */
529 /* how(I) - indicates the type of flush operation */
530 /* */
531 /* Walk through all of the proxies and pass on the flush command as either */
532 /* a flush or a clear. */
533 /* ------------------------------------------------------------------------ */
534 void
ipf_proxy_flush(void * arg,int how)535 ipf_proxy_flush(void *arg, int how)
536 {
537 ipf_proxy_softc_t *softp = arg;
538 aproxy_t *ap;
539
540 switch (how)
541 {
542 case 0 :
543 for (ap = softp->ips_proxies; ap; ap = ap->apr_next)
544 if (ap->apr_flush != NULL)
545 (*ap->apr_flush)(ap, how);
546 break;
547 case 1 :
548 for (ap = softp->ips_proxies; ap; ap = ap->apr_next)
549 if (ap->apr_clear != NULL)
550 (*ap->apr_clear)(ap);
551 break;
552 default :
553 break;
554 }
555 }
556
557
558 /* ------------------------------------------------------------------------ */
559 /* Function: ipf_proxy_add */
560 /* Returns: int - 0 == success, else failure. */
561 /* Parameters: ap(I) - pointer to proxy structure */
562 /* */
563 /* Dynamically add a new kernel proxy. Ensure that it is unique in the */
564 /* collection compiled in and dynamically added. */
565 /* ------------------------------------------------------------------------ */
566 int
ipf_proxy_add(void * arg,aproxy_t * ap)567 ipf_proxy_add(void *arg, aproxy_t *ap)
568 {
569 ipf_proxy_softc_t *softp = arg;
570
571 aproxy_t *a;
572
573 for (a = ips_proxies; a->apr_p; a++)
574 if ((a->apr_p == ap->apr_p) &&
575 !strncmp(a->apr_label, ap->apr_label,
576 sizeof(ap->apr_label))) {
577 if (softp->ips_proxy_debug & 0x01)
578 printf("ipf_proxy_add: %s/%d present (B)\n",
579 a->apr_label, a->apr_p);
580 return -1;
581 }
582
583 for (a = ap_proxylist; (a != NULL); a = a->apr_next)
584 if ((a->apr_p == ap->apr_p) &&
585 !strncmp(a->apr_label, ap->apr_label,
586 sizeof(ap->apr_label))) {
587 if (softp->ips_proxy_debug & 0x01)
588 printf("ipf_proxy_add: %s/%d present (D)\n",
589 a->apr_label, a->apr_p);
590 return -1;
591 }
592 ap->apr_next = ap_proxylist;
593 ap_proxylist = ap;
594 if (ap->apr_load != NULL)
595 (*ap->apr_load)();
596 return 0;
597 }
598
599
600 /* ------------------------------------------------------------------------ */
601 /* Function: ipf_proxy_ctl */
602 /* Returns: int - 0 == success, else error */
603 /* Parameters: softc(I) - pointer to soft context main structure */
604 /* arg(I) - pointer to proxy context */
605 /* ctl(I) - pointer to proxy control structure */
606 /* */
607 /* Check to see if the proxy this control request has come through for */
608 /* exists, and if it does and it has a control function then invoke that */
609 /* control function. */
610 /* ------------------------------------------------------------------------ */
611 int
ipf_proxy_ctl(ipf_main_softc_t * softc,void * arg,ap_ctl_t * ctl)612 ipf_proxy_ctl(ipf_main_softc_t *softc, void *arg, ap_ctl_t *ctl)
613 {
614 ipf_proxy_softc_t *softp = arg;
615 aproxy_t *a;
616 int error;
617
618 a = ipf_proxy_lookup(arg, ctl->apc_p, ctl->apc_label);
619 if (a == NULL) {
620 if (softp->ips_proxy_debug & 0x01)
621 printf("ipf_proxy_ctl: can't find %s/%d\n",
622 ctl->apc_label, ctl->apc_p);
623 IPFERROR(80001);
624 error = ESRCH;
625 } else if (a->apr_ctl == NULL) {
626 if (softp->ips_proxy_debug & 0x01)
627 printf("ipf_proxy_ctl: no ctl function for %s/%d\n",
628 ctl->apc_label, ctl->apc_p);
629 IPFERROR(80002);
630 error = ENXIO;
631 } else {
632 error = (*a->apr_ctl)(softc, a->apr_soft, ctl);
633 if ((error != 0) && (softp->ips_proxy_debug & 0x02))
634 printf("ipf_proxy_ctl: %s/%d ctl error %d\n",
635 a->apr_label, a->apr_p, error);
636 }
637 return error;
638 }
639
640
641 /* ------------------------------------------------------------------------ */
642 /* Function: ipf_proxy_del */
643 /* Returns: int - 0 == success, else failure. */
644 /* Parameters: ap(I) - pointer to proxy structure */
645 /* */
646 /* Delete a proxy that has been added dynamically from those available. */
647 /* If it is in use, return 1 (do not destroy NOW), not in use 0 or -1 */
648 /* if it cannot be matched. */
649 /* ------------------------------------------------------------------------ */
650 int
ipf_proxy_del(aproxy_t * ap)651 ipf_proxy_del(aproxy_t *ap)
652 {
653 aproxy_t *a, **app;
654
655 for (app = &ap_proxylist; ((a = *app) != NULL); app = &a->apr_next) {
656 if (a == ap) {
657 a->apr_flags |= APR_DELETE;
658 if (ap->apr_ref == 0 && ap->apr_clones == 0) {
659 *app = a->apr_next;
660 return 0;
661 }
662 return 1;
663 }
664 }
665
666 return -1;
667 }
668
669
670 /* ------------------------------------------------------------------------ */
671 /* Function: ipf_proxy_ok */
672 /* Returns: int - 1 == good match else not. */
673 /* Parameters: fin(I) - pointer to packet information */
674 /* tcp(I) - pointer to TCP/UDP header */
675 /* nat(I) - pointer to current NAT session */
676 /* */
677 /* This function extends the NAT matching to ensure that a packet that has */
678 /* arrived matches the proxy information attached to the NAT rule. Notably, */
679 /* if the proxy is scheduled to be deleted then packets will not match the */
680 /* rule even if the rule is still active. */
681 /* ------------------------------------------------------------------------ */
682 int
ipf_proxy_ok(fr_info_t * fin,tcphdr_t * tcp,ipnat_t * np)683 ipf_proxy_ok(fr_info_t *fin, tcphdr_t *tcp, ipnat_t *np)
684 {
685 aproxy_t *apr = np->in_apr;
686 u_short dport = np->in_odport;
687
688 if ((apr == NULL) || (apr->apr_flags & APR_DELETE) ||
689 (fin->fin_p != apr->apr_p))
690 return 0;
691 if ((tcp == NULL) && dport)
692 return 0;
693 return 1;
694 }
695
696
697 /* ------------------------------------------------------------------------ */
698 /* Function: ipf_proxy_ioctl */
699 /* Returns: int - 0 == success, else error */
700 /* Parameters: softc(I) - pointer to soft context main structure */
701 /* data(I) - pointer to ioctl data */
702 /* cmd(I) - ioctl command */
703 /* mode(I) - mode bits for device */
704 /* ctx(I) - pointer to context information */
705 /* */
706 /* ------------------------------------------------------------------------ */
707 int
ipf_proxy_ioctl(ipf_main_softc_t * softc,void * data,ioctlcmd_t cmd,int mode,void * ctx)708 ipf_proxy_ioctl(ipf_main_softc_t *softc, void *data, ioctlcmd_t cmd, int mode,
709 void *ctx)
710 {
711 ap_ctl_t ctl;
712 void *ptr;
713 int error;
714
715 mode = mode; /* LINT */
716
717 switch (cmd)
718 {
719 case SIOCPROXY :
720 error = ipf_inobj(softc, data, NULL, &ctl, IPFOBJ_PROXYCTL);
721 if (error != 0) {
722 return error;
723 }
724 ptr = NULL;
725
726 if (ctl.apc_dsize > 0) {
727 KMALLOCS(ptr, void *, ctl.apc_dsize);
728 if (ptr == NULL) {
729 IPFERROR(80003);
730 error = ENOMEM;
731 } else {
732 error = copyinptr(softc, ctl.apc_data, ptr,
733 ctl.apc_dsize);
734 if (error == 0)
735 ctl.apc_data = ptr;
736 }
737 } else {
738 ctl.apc_data = NULL;
739 error = 0;
740 }
741
742 if (error == 0)
743 error = ipf_proxy_ctl(softc, softc->ipf_proxy_soft,
744 &ctl);
745
746 if ((error != 0) && (ptr != NULL)) {
747 KFREES(ptr, ctl.apc_dsize);
748 }
749 break;
750
751 default :
752 IPFERROR(80004);
753 error = EINVAL;
754 }
755 return error;
756 }
757
758
759 /* ------------------------------------------------------------------------ */
760 /* Function: ipf_proxy_match */
761 /* Returns: int - 0 == success, else error */
762 /* Parameters: fin(I) - pointer to packet information */
763 /* nat(I) - pointer to current NAT session */
764 /* */
765 /* If a proxy has a match function, call that to do extended packet */
766 /* matching. Whilst other parts of the NAT code are rather lenient when it */
767 /* comes to the quality of the packet that it will transform, the proxy */
768 /* matching is not because they need to work with data, not just headers. */
769 /* ------------------------------------------------------------------------ */
770 int
ipf_proxy_match(fr_info_t * fin,nat_t * nat)771 ipf_proxy_match(fr_info_t *fin, nat_t *nat)
772 {
773 ipf_main_softc_t *softc = fin->fin_main_soft;
774 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
775 aproxy_t *apr;
776 ipnat_t *ipn;
777 int result;
778
779 ipn = nat->nat_ptr;
780 if (softp->ips_proxy_debug & 0x04)
781 printf("ipf_proxy_match(%lx,%lx) aps %lx ptr %lx\n",
782 (u_long)fin, (u_long)nat, (u_long)nat->nat_aps,
783 (u_long)ipn);
784
785 if ((fin->fin_flx & (FI_SHORT|FI_BAD)) != 0) {
786 if (softp->ips_proxy_debug & 0x08)
787 printf("ipf_proxy_match: flx 0x%x (BAD|SHORT)\n",
788 fin->fin_flx);
789 return -1;
790 }
791
792 apr = ipn->in_apr;
793 if ((apr == NULL) || (apr->apr_flags & APR_DELETE)) {
794 if (softp->ips_proxy_debug & 0x08)
795 printf("ipf_proxy_match:apr %lx apr_flags 0x%x\n",
796 (u_long)apr, apr ? apr->apr_flags : 0);
797 return -1;
798 }
799
800 if (apr->apr_match != NULL) {
801 result = (*apr->apr_match)(fin, nat->nat_aps, nat);
802 if (result != 0) {
803 if (softp->ips_proxy_debug & 0x08)
804 printf("ipf_proxy_match: result %d\n", result);
805 return -1;
806 }
807 }
808 return 0;
809 }
810
811
812 /* ------------------------------------------------------------------------ */
813 /* Function: ipf_proxy_new */
814 /* Returns: int - 0 == success, else error */
815 /* Parameters: fin(I) - pointer to packet information */
816 /* nat(I) - pointer to current NAT session */
817 /* */
818 /* Allocate a new application proxy structure and fill it in with the */
819 /* relevant details. call the init function once complete, prior to */
820 /* returning. */
821 /* ------------------------------------------------------------------------ */
822 int
ipf_proxy_new(fr_info_t * fin,nat_t * nat)823 ipf_proxy_new(fr_info_t *fin, nat_t *nat)
824 {
825 ipf_main_softc_t *softc = fin->fin_main_soft;
826 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
827 register ap_session_t *aps;
828 aproxy_t *apr;
829
830 if (softp->ips_proxy_debug & 0x04)
831 printf("ipf_proxy_new(%lx,%lx) \n", (u_long)fin, (u_long)nat);
832
833 if ((nat->nat_ptr == NULL) || (nat->nat_aps != NULL)) {
834 if (softp->ips_proxy_debug & 0x08)
835 printf("ipf_proxy_new: nat_ptr %lx nat_aps %lx\n",
836 (u_long)nat->nat_ptr, (u_long)nat->nat_aps);
837 return -1;
838 }
839
840 apr = nat->nat_ptr->in_apr;
841
842 if ((apr->apr_flags & APR_DELETE) ||
843 (fin->fin_p != apr->apr_p)) {
844 if (softp->ips_proxy_debug & 0x08)
845 printf("ipf_proxy_new: apr_flags 0x%x p %d/%d\n",
846 apr->apr_flags, fin->fin_p, apr->apr_p);
847 return -1;
848 }
849
850 KMALLOC(aps, ap_session_t *);
851 if (!aps) {
852 if (softp->ips_proxy_debug & 0x08)
853 printf("ipf_proxy_new: malloc failed (%lu)\n",
854 (u_long)sizeof(ap_session_t));
855 return -1;
856 }
857
858 bzero((char *)aps, sizeof(*aps));
859 aps->aps_data = NULL;
860 aps->aps_apr = apr;
861 aps->aps_psiz = 0;
862 if (apr->apr_new != NULL)
863 if ((*apr->apr_new)(apr->apr_soft, fin, aps, nat) == -1) {
864 if ((aps->aps_data != NULL) && (aps->aps_psiz != 0)) {
865 KFREES(aps->aps_data, aps->aps_psiz);
866 }
867 KFREE(aps);
868 if (softp->ips_proxy_debug & 0x08)
869 printf("ipf_proxy_new: new(%lx) failed\n",
870 (u_long)apr->apr_new);
871 return -1;
872 }
873 aps->aps_nat = nat;
874 aps->aps_next = softp->ips_sess_list;
875 softp->ips_sess_list = aps;
876 nat->nat_aps = aps;
877
878 return 0;
879 }
880
881
882 /* ------------------------------------------------------------------------ */
883 /* Function: ipf_proxy_check */
884 /* Returns: int - -1 == error, 0 == success */
885 /* Parameters: fin(I) - pointer to packet information */
886 /* nat(I) - pointer to current NAT session */
887 /* */
888 /* Check to see if a packet should be passed through an active proxy */
889 /* routine if one has been setup for it. We don't need to check the */
890 /* checksum here if IPFILTER_CKSUM is defined because if it is, a failed */
891 /* check causes FI_BAD to be set. */
892 /* ------------------------------------------------------------------------ */
893 int
ipf_proxy_check(fr_info_t * fin,nat_t * nat)894 ipf_proxy_check(fr_info_t *fin, nat_t *nat)
895 {
896 ipf_main_softc_t *softc = fin->fin_main_soft;
897 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
898 #if SOLARIS && defined(_KERNEL) && defined(ICK_VALID)
899 mb_t *m;
900 #endif
901 tcphdr_t *tcp = NULL;
902 udphdr_t *udp = NULL;
903 ap_session_t *aps;
904 aproxy_t *apr;
905 short adjlen;
906 int dosum;
907 ip_t *ip;
908 short rv;
909 int err;
910 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi)
911 u_32_t s1, s2, sd;
912 #endif
913
914 if (fin->fin_flx & FI_BAD) {
915 if (softp->ips_proxy_debug & 0x08)
916 printf("ipf_proxy_check: flx 0x%x (BAD)\n",
917 fin->fin_flx);
918 return -1;
919 }
920
921 #ifndef IPFILTER_CKSUM
922 if ((fin->fin_out == 0) && (ipf_checkl4sum(fin) == -1)) {
923 if (softp->ips_proxy_debug & 0x08)
924 printf("ipf_proxy_check: l4 checksum failure %d\n",
925 fin->fin_p);
926 if (fin->fin_p == IPPROTO_TCP)
927 softc->ipf_stats[fin->fin_out].fr_tcpbad++;
928 return -1;
929 }
930 #endif
931
932 aps = nat->nat_aps;
933 if (aps != NULL) {
934 /*
935 * If there is data in this packet to be proxied then try and
936 * get it all into the one buffer, else drop it.
937 */
938 #if defined(MENTAT) || defined(HAVE_M_PULLDOWN)
939 if ((fin->fin_dlen > 0) && !(fin->fin_flx & FI_COALESCE))
940 if (ipf_coalesce(fin) == -1) {
941 if (softp->ips_proxy_debug & 0x08)
942 printf("ipf_proxy_check: %s %x\n",
943 "coalesce failed", fin->fin_flx);
944 return -1;
945 }
946 #endif
947 ip = fin->fin_ip;
948 if (fin->fin_cksum > FI_CK_SUMOK)
949 dosum = 0;
950 else
951 dosum = 1;
952
953 switch (fin->fin_p)
954 {
955 case IPPROTO_TCP :
956 tcp = (tcphdr_t *)fin->fin_dp;
957 #if SOLARIS && defined(_KERNEL) && defined(ICK_VALID)
958 m = fin->fin_qfm;
959 if (dohwcksum && (m->b_ick_flag == ICK_VALID))
960 dosum = 0;
961 #endif
962 break;
963 case IPPROTO_UDP :
964 udp = (udphdr_t *)fin->fin_dp;
965 break;
966 default :
967 break;
968 }
969
970 apr = aps->aps_apr;
971 err = 0;
972 if (fin->fin_out != 0) {
973 if (apr->apr_outpkt != NULL)
974 err = (*apr->apr_outpkt)(apr->apr_soft, fin,
975 aps, nat);
976 } else {
977 if (apr->apr_inpkt != NULL)
978 err = (*apr->apr_inpkt)(apr->apr_soft, fin,
979 aps, nat);
980 }
981
982 rv = APR_EXIT(err);
983 if (((softp->ips_proxy_debug & 0x08) && (rv != 0)) ||
984 (softp->ips_proxy_debug & 0x04))
985 printf("ipf_proxy_check: out %d err %x rv %d\n",
986 fin->fin_out, err, rv);
987 if (rv == 1)
988 return -1;
989
990 if (rv == 2) {
991 ipf_proxy_deref(apr);
992 nat->nat_aps = NULL;
993 return -1;
994 }
995
996 /*
997 * If err != 0 then the data size of the packet has changed
998 * so we need to recalculate the header checksums for the
999 * packet.
1000 */
1001 adjlen = APR_INC(err);
1002 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi)
1003 s1 = LONG_SUM(fin->fin_plen - adjlen);
1004 s2 = LONG_SUM(fin->fin_plen);
1005 CALC_SUMD(s1, s2, sd);
1006 if ((err != 0) && (fin->fin_cksum < FI_CK_L4PART) &&
1007 fin->fin_v == 4)
1008 ipf_fix_outcksum(0, &ip->ip_sum, sd, 0);
1009 #endif
1010 if (fin->fin_flx & FI_DOCKSUM)
1011 dosum = 1;
1012
1013 #ifdef INET
1014 /*
1015 * For TCP packets, we may need to adjust the sequence and
1016 * acknowledgement numbers to reflect changes in size of the
1017 * data stream.
1018 *
1019 * For both TCP and UDP, recalculate the layer 4 checksum,
1020 * regardless, as we can't tell (here) if data has been
1021 * changed or not.
1022 */
1023 if (tcp != NULL) {
1024 err = ipf_proxy_fixseqack(fin, ip, aps, adjlen);
1025 if (fin->fin_cksum == FI_CK_L4PART) {
1026 u_short sum = ntohs(tcp->th_sum);
1027 sum += adjlen;
1028 tcp->th_sum = htons(sum);
1029 } else if (fin->fin_cksum < FI_CK_L4PART) {
1030 tcp->th_sum = fr_cksum(fin, ip,
1031 IPPROTO_TCP, tcp);
1032 }
1033 } else if ((udp != NULL) && (udp->uh_sum != 0)) {
1034 if (fin->fin_cksum == FI_CK_L4PART) {
1035 u_short sum = ntohs(udp->uh_sum);
1036 sum += adjlen;
1037 udp->uh_sum = htons(sum);
1038 } else if (dosum) {
1039 udp->uh_sum = fr_cksum(fin, ip,
1040 IPPROTO_UDP, udp);
1041 }
1042 }
1043 #endif
1044 aps->aps_bytes += fin->fin_plen;
1045 aps->aps_pkts++;
1046 return 1;
1047 }
1048 return 0;
1049 }
1050
1051
1052 /* ------------------------------------------------------------------------ */
1053 /* Function: ipf_proxy_lookup */
1054 /* Returns: int - -1 == error, 0 == success */
1055 /* Parameters: arg(I) - pointer to proxy context information */
1056 /* pr(I) - protocol number for proxy */
1057 /* name(I) - proxy name */
1058 /* */
1059 /* Search for an proxy by the protocol it is being used with and its name. */
1060 /* ------------------------------------------------------------------------ */
1061 aproxy_t *
ipf_proxy_lookup(void * arg,u_int pr,char * name)1062 ipf_proxy_lookup(void *arg, u_int pr, char *name)
1063 {
1064 ipf_proxy_softc_t *softp = arg;
1065 aproxy_t *ap;
1066
1067 if (softp->ips_proxy_debug & 0x04)
1068 printf("ipf_proxy_lookup(%d,%s)\n", pr, name);
1069
1070 for (ap = softp->ips_proxies; ap != NULL; ap = ap->apr_next)
1071 if ((ap->apr_p == pr) &&
1072 !strncmp(name, ap->apr_label, sizeof(ap->apr_label))) {
1073 ap->apr_ref++;
1074 return ap;
1075 }
1076
1077 if (softp->ips_proxy_debug & 0x08)
1078 printf("ipf_proxy_lookup: failed for %d/%s\n", pr, name);
1079 return NULL;
1080 }
1081
1082
1083 /* ------------------------------------------------------------------------ */
1084 /* Function: ipf_proxy_deref */
1085 /* Returns: Nil */
1086 /* Parameters: ap(I) - pointer to proxy structure */
1087 /* */
1088 /* Drop the reference counter associated with the proxy. */
1089 /* ------------------------------------------------------------------------ */
1090 void
ipf_proxy_deref(aproxy_t * ap)1091 ipf_proxy_deref(aproxy_t *ap)
1092 {
1093 ap->apr_ref--;
1094 }
1095
1096
1097 /* ------------------------------------------------------------------------ */
1098 /* Function: ipf_proxy_free */
1099 /* Returns: Nil */
1100 /* Parameters: softc(I) - pointer to soft context main structure */
1101 /* aps(I) - pointer to current proxy session */
1102 /* Locks Held: ipf_nat_new, ipf_nat(W) */
1103 /* */
1104 /* Free up proxy session information allocated to be used with a NAT */
1105 /* session. */
1106 /* ------------------------------------------------------------------------ */
1107 void
ipf_proxy_free(ipf_main_softc_t * softc,ap_session_t * aps)1108 ipf_proxy_free(ipf_main_softc_t *softc, ap_session_t *aps)
1109 {
1110 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
1111 ap_session_t *a, **ap;
1112 aproxy_t *apr;
1113
1114 if (!aps)
1115 return;
1116
1117 for (ap = &softp->ips_sess_list; ((a = *ap) != NULL); ap = &a->aps_next)
1118 if (a == aps) {
1119 *ap = a->aps_next;
1120 break;
1121 }
1122
1123 apr = aps->aps_apr;
1124 if ((apr != NULL) && (apr->apr_del != NULL))
1125 (*apr->apr_del)(softc, aps);
1126
1127 if ((aps->aps_data != NULL) && (aps->aps_psiz != 0))
1128 KFREES(aps->aps_data, aps->aps_psiz);
1129 KFREE(aps);
1130 }
1131
1132
1133 /* ------------------------------------------------------------------------ */
1134 /* Function: ipf_proxy_fixseqack */
1135 /* Returns: int - 2 if TCP ack/seq is changed, else 0 */
1136 /* Parameters: fin(I) - pointer to packet information */
1137 /* ip(I) - pointer to IP header */
1138 /* nat(I) - pointer to current NAT session */
1139 /* inc(I) - delta to apply to TCP sequence numbering */
1140 /* */
1141 /* Adjust the TCP sequence/acknowledge numbers in the TCP header based on */
1142 /* whether or not the new header is past the point at which an adjustment */
1143 /* occurred. This might happen because of (say) an FTP string being changed */
1144 /* and the new string being a different length to the old. */
1145 /* ------------------------------------------------------------------------ */
1146 static int
ipf_proxy_fixseqack(fr_info_t * fin,ip_t * ip,ap_session_t * aps,int inc)1147 ipf_proxy_fixseqack(fr_info_t *fin, ip_t *ip, ap_session_t *aps, int inc)
1148 {
1149 ipf_main_softc_t *softc = fin->fin_main_soft;
1150 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
1151 int sel, ch = 0, out, nlen;
1152 u_32_t seq1, seq2;
1153 tcphdr_t *tcp;
1154 short inc2;
1155
1156 tcp = (tcphdr_t *)fin->fin_dp;
1157 out = fin->fin_out;
1158 /*
1159 * ip_len has already been adjusted by 'inc'.
1160 */
1161 nlen = fin->fin_dlen;
1162 nlen -= (TCP_OFF(tcp) << 2);
1163
1164 inc2 = inc;
1165 inc = (int)inc2;
1166
1167 if (out != 0) {
1168 seq1 = (u_32_t)ntohl(tcp->th_seq);
1169 sel = aps->aps_sel[out];
1170
1171 /* switch to other set ? */
1172 if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) &&
1173 (seq1 > aps->aps_seqmin[!sel])) {
1174 if (softp->ips_proxy_debug & 0x10)
1175 printf("proxy out switch set seq %d -> %d %x > %x\n",
1176 sel, !sel, seq1,
1177 aps->aps_seqmin[!sel]);
1178 sel = aps->aps_sel[out] = !sel;
1179 }
1180
1181 if (aps->aps_seqoff[sel]) {
1182 seq2 = aps->aps_seqmin[sel] - aps->aps_seqoff[sel];
1183 if (seq1 > seq2) {
1184 seq2 = aps->aps_seqoff[sel];
1185 seq1 += seq2;
1186 tcp->th_seq = htonl(seq1);
1187 ch = 1;
1188 }
1189 }
1190
1191 if (inc && (seq1 > aps->aps_seqmin[!sel])) {
1192 aps->aps_seqmin[sel] = seq1 + nlen - 1;
1193 aps->aps_seqoff[sel] = aps->aps_seqoff[sel] + inc;
1194 if (softp->ips_proxy_debug & 0x10)
1195 printf("proxy seq set %d at %x to %d + %d\n",
1196 sel, aps->aps_seqmin[sel],
1197 aps->aps_seqoff[sel], inc);
1198 }
1199
1200 /***/
1201
1202 seq1 = ntohl(tcp->th_ack);
1203 sel = aps->aps_sel[1 - out];
1204
1205 /* switch to other set ? */
1206 if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) &&
1207 (seq1 > aps->aps_ackmin[!sel])) {
1208 if (softp->ips_proxy_debug & 0x10)
1209 printf("proxy out switch set ack %d -> %d %x > %x\n",
1210 sel, !sel, seq1,
1211 aps->aps_ackmin[!sel]);
1212 sel = aps->aps_sel[1 - out] = !sel;
1213 }
1214
1215 if (aps->aps_ackoff[sel] && (seq1 > aps->aps_ackmin[sel])) {
1216 seq2 = aps->aps_ackoff[sel];
1217 tcp->th_ack = htonl(seq1 - seq2);
1218 ch = 1;
1219 }
1220 } else {
1221 seq1 = ntohl(tcp->th_seq);
1222 sel = aps->aps_sel[out];
1223
1224 /* switch to other set ? */
1225 if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) &&
1226 (seq1 > aps->aps_ackmin[!sel])) {
1227 if (softp->ips_proxy_debug & 0x10)
1228 printf("proxy in switch set ack %d -> %d %x > %x\n",
1229 sel, !sel, seq1, aps->aps_ackmin[!sel]);
1230 sel = aps->aps_sel[out] = !sel;
1231 }
1232
1233 if (aps->aps_ackoff[sel]) {
1234 seq2 = aps->aps_ackmin[sel] - aps->aps_ackoff[sel];
1235 if (seq1 > seq2) {
1236 seq2 = aps->aps_ackoff[sel];
1237 seq1 += seq2;
1238 tcp->th_seq = htonl(seq1);
1239 ch = 1;
1240 }
1241 }
1242
1243 if (inc && (seq1 > aps->aps_ackmin[!sel])) {
1244 aps->aps_ackmin[!sel] = seq1 + nlen - 1;
1245 aps->aps_ackoff[!sel] = aps->aps_ackoff[sel] + inc;
1246
1247 if (softp->ips_proxy_debug & 0x10)
1248 printf("proxy ack set %d at %x to %d + %d\n",
1249 !sel, aps->aps_seqmin[!sel],
1250 aps->aps_seqoff[sel], inc);
1251 }
1252
1253 /***/
1254
1255 seq1 = ntohl(tcp->th_ack);
1256 sel = aps->aps_sel[1 - out];
1257
1258 /* switch to other set ? */
1259 if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) &&
1260 (seq1 > aps->aps_seqmin[!sel])) {
1261 if (softp->ips_proxy_debug & 0x10)
1262 printf("proxy in switch set seq %d -> %d %x > %x\n",
1263 sel, !sel, seq1, aps->aps_seqmin[!sel]);
1264 sel = aps->aps_sel[1 - out] = !sel;
1265 }
1266
1267 if (aps->aps_seqoff[sel] != 0) {
1268 if (softp->ips_proxy_debug & 0x10)
1269 printf("sel %d seqoff %d seq1 %x seqmin %x\n",
1270 sel, aps->aps_seqoff[sel], seq1,
1271 aps->aps_seqmin[sel]);
1272 if (seq1 > aps->aps_seqmin[sel]) {
1273 seq2 = aps->aps_seqoff[sel];
1274 tcp->th_ack = htonl(seq1 - seq2);
1275 ch = 1;
1276 }
1277 }
1278 }
1279
1280 if (softp->ips_proxy_debug & 0x10)
1281 printf("ipf_proxy_fixseqack: seq %u ack %u\n",
1282 (u_32_t)ntohl(tcp->th_seq), (u_32_t)ntohl(tcp->th_ack));
1283 return ch ? 2 : 0;
1284 }
1285
1286
1287 /* ------------------------------------------------------------------------ */
1288 /* Function: ipf_proxy_rule_rev */
1289 /* Returns: ipnat_t * - NULL = failure, else pointer to new rule */
1290 /* Parameters: nat(I) - pointer to NAT session to create rule from */
1291 /* */
1292 /* This function creates a NAT rule that is based upon the reverse packet */
1293 /* flow associated with this NAT session. Thus if this NAT session was */
1294 /* created with a map rule then this function will create a rdr rule. */
1295 /* Only address fields and network interfaces are assigned in this function */
1296 /* and the address fields are formed such that an exact is required. If the */
1297 /* original rule had a netmask, that is not replicated here not is it */
1298 /* desired. The ultimate goal here is to create a NAT rule to support a NAT */
1299 /* session being created that does not have a user configured rule. The */
1300 /* classic example is supporting the FTP proxy, where a data channel needs */
1301 /* to be setup, based on the addresses used for the control connection. In */
1302 /* that case, this function is used to handle creating NAT rules to support */
1303 /* data connections with the PORT and EPRT commands. */
1304 /* ------------------------------------------------------------------------ */
1305 ipnat_t *
ipf_proxy_rule_rev(nat_t * nat)1306 ipf_proxy_rule_rev(nat_t *nat)
1307 {
1308 ipnat_t *old;
1309 ipnat_t *ipn;
1310 int size;
1311
1312 old = nat->nat_ptr;
1313 size = old->in_size;
1314
1315 KMALLOCS(ipn, ipnat_t *, size);
1316 if (ipn == NULL)
1317 return NULL;
1318
1319 bzero((char *)ipn, size);
1320
1321 ipn->in_use = 1;
1322 ipn->in_hits = 1;
1323 ipn->in_ippip = 1;
1324 ipn->in_apr = NULL;
1325 ipn->in_size = size;
1326 ipn->in_pr[0] = old->in_pr[1];
1327 ipn->in_pr[1] = old->in_pr[0];
1328 ipn->in_v[0] = old->in_v[1];
1329 ipn->in_v[1] = old->in_v[0];
1330 ipn->in_ifps[0] = old->in_ifps[1];
1331 ipn->in_ifps[1] = old->in_ifps[0];
1332 ipn->in_flags = (old->in_flags | IPN_PROXYRULE);
1333
1334 ipn->in_nsrcip6 = nat->nat_odst6;
1335 ipn->in_osrcip6 = nat->nat_ndst6;
1336
1337 if ((old->in_redir & NAT_REDIRECT) != 0) {
1338 ipn->in_redir = NAT_MAP;
1339 if (ipn->in_v[0] == 4) {
1340 ipn->in_snip = ntohl(nat->nat_odstaddr);
1341 ipn->in_dnip = ntohl(nat->nat_nsrcaddr);
1342 } else {
1343 #ifdef USE_INET6
1344 ipn->in_snip6 = nat->nat_odst6;
1345 ipn->in_dnip6 = nat->nat_nsrc6;
1346 #endif
1347 }
1348 ipn->in_ndstip6 = nat->nat_nsrc6;
1349 ipn->in_odstip6 = nat->nat_osrc6;
1350 } else {
1351 ipn->in_redir = NAT_REDIRECT;
1352 if (ipn->in_v[0] == 4) {
1353 ipn->in_snip = ntohl(nat->nat_odstaddr);
1354 ipn->in_dnip = ntohl(nat->nat_osrcaddr);
1355 } else {
1356 #ifdef USE_INET6
1357 ipn->in_snip6 = nat->nat_odst6;
1358 ipn->in_dnip6 = nat->nat_osrc6;
1359 #endif
1360 }
1361 ipn->in_ndstip6 = nat->nat_osrc6;
1362 ipn->in_odstip6 = nat->nat_nsrc6;
1363 }
1364
1365 IP6_SETONES(&ipn->in_osrcmsk6);
1366 IP6_SETONES(&ipn->in_nsrcmsk6);
1367 IP6_SETONES(&ipn->in_odstmsk6);
1368 IP6_SETONES(&ipn->in_ndstmsk6);
1369
1370 ipn->in_namelen = old->in_namelen;
1371 ipn->in_ifnames[0] = old->in_ifnames[1];
1372 ipn->in_ifnames[1] = old->in_ifnames[0];
1373 bcopy(old->in_names, ipn->in_names, ipn->in_namelen);
1374 MUTEX_INIT(&ipn->in_lock, "ipnat rev rule lock");
1375
1376 return ipn;
1377 }
1378
1379
1380 /* ------------------------------------------------------------------------ */
1381 /* Function: ipf_proxy_rule_fwd */
1382 /* Returns: ipnat_t * - NULL = failure, else pointer to new rule */
1383 /* Parameters: nat(I) - pointer to NAT session to create rule from */
1384 /* */
1385 /* The purpose and rationale of this function is much the same as the above */
1386 /* function, ipf_proxy_rule_rev, except that a rule is created that matches */
1387 /* the same direction as that of the existing NAT session. Thus if this NAT */
1388 /* session was created with a map rule then this function will also create */
1389 /* a data structure to represent a map rule. Whereas ipf_proxy_rule_rev is */
1390 /* used to support PORT/EPRT, this function supports PASV/EPSV. */
1391 /* ------------------------------------------------------------------------ */
1392 ipnat_t *
ipf_proxy_rule_fwd(nat_t * nat)1393 ipf_proxy_rule_fwd(nat_t *nat)
1394 {
1395 ipnat_t *old;
1396 ipnat_t *ipn;
1397 int size;
1398
1399 old = nat->nat_ptr;
1400 size = old->in_size;
1401
1402 KMALLOCS(ipn, ipnat_t *, size);
1403 if (ipn == NULL)
1404 return NULL;
1405
1406 bzero((char *)ipn, size);
1407
1408 ipn->in_use = 1;
1409 ipn->in_hits = 1;
1410 ipn->in_ippip = 1;
1411 ipn->in_apr = NULL;
1412 ipn->in_size = size;
1413 ipn->in_pr[0] = old->in_pr[0];
1414 ipn->in_pr[1] = old->in_pr[1];
1415 ipn->in_v[0] = old->in_v[0];
1416 ipn->in_v[1] = old->in_v[1];
1417 ipn->in_ifps[0] = nat->nat_ifps[0];
1418 ipn->in_ifps[1] = nat->nat_ifps[1];
1419 ipn->in_flags = (old->in_flags | IPN_PROXYRULE);
1420
1421 ipn->in_nsrcip6 = nat->nat_nsrc6;
1422 ipn->in_osrcip6 = nat->nat_osrc6;
1423 ipn->in_ndstip6 = nat->nat_ndst6;
1424 ipn->in_odstip6 = nat->nat_odst6;
1425 ipn->in_redir = old->in_redir;
1426
1427 if (ipn->in_v[0] == 4) {
1428 ipn->in_snip = ntohl(nat->nat_nsrcaddr);
1429 ipn->in_dnip = ntohl(nat->nat_ndstaddr);
1430 } else {
1431 #ifdef USE_INET6
1432 ipn->in_snip6 = nat->nat_nsrc6;
1433 ipn->in_dnip6 = nat->nat_ndst6;
1434 #endif
1435 }
1436
1437 IP6_SETONES(&ipn->in_osrcmsk6);
1438 IP6_SETONES(&ipn->in_nsrcmsk6);
1439 IP6_SETONES(&ipn->in_odstmsk6);
1440 IP6_SETONES(&ipn->in_ndstmsk6);
1441
1442 ipn->in_namelen = old->in_namelen;
1443 ipn->in_ifnames[0] = old->in_ifnames[0];
1444 ipn->in_ifnames[1] = old->in_ifnames[1];
1445 bcopy(old->in_names, ipn->in_names, ipn->in_namelen);
1446 MUTEX_INIT(&ipn->in_lock, "ipnat fwd rule lock");
1447
1448 return ipn;
1449 }
1450