1 | /* $NetBSD: ip_fil_netbsd.c,v 1.18 2016/07/18 21:07:30 pgoyette 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(lint) |
9 | #if defined(__NetBSD__) |
10 | #include <sys/cdefs.h> |
11 | __KERNEL_RCSID(0, "$NetBSD: ip_fil_netbsd.c,v 1.18 2016/07/18 21:07:30 pgoyette Exp $" ); |
12 | #else |
13 | static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed" ; |
14 | static const char rcsid[] = "@(#)Id: ip_fil_netbsd.c,v 1.1.1.2 2012/07/22 13:45:17 darrenr Exp" ; |
15 | #endif |
16 | #endif |
17 | |
18 | #if defined(KERNEL) || defined(_KERNEL) |
19 | # undef KERNEL |
20 | # undef _KERNEL |
21 | # define KERNEL 1 |
22 | # define _KERNEL 1 |
23 | #endif |
24 | #include <sys/param.h> |
25 | #if (NetBSD >= 199905) && !defined(IPFILTER_LKM) |
26 | # if (__NetBSD_Version__ >= 799003000) |
27 | # ifdef _KERNEL_OPT |
28 | # include "opt_ipsec.h" |
29 | # endif |
30 | # else |
31 | # include "opt_ipsec.h" |
32 | # endif |
33 | #endif |
34 | #include <sys/errno.h> |
35 | #include <sys/types.h> |
36 | #include <sys/file.h> |
37 | #include <sys/ioctl.h> |
38 | #include <sys/time.h> |
39 | #include <sys/systm.h> |
40 | #include <sys/select.h> |
41 | #if (NetBSD > 199609) |
42 | # include <sys/dirent.h> |
43 | #else |
44 | # include <sys/dir.h> |
45 | #endif |
46 | #if (__NetBSD_Version__ >= 599005900) |
47 | # include <sys/cprng.h> |
48 | #endif |
49 | #include <sys/mbuf.h> |
50 | #include <sys/protosw.h> |
51 | #include <sys/socket.h> |
52 | #include <sys/poll.h> |
53 | #if (__NetBSD_Version__ >= 399002000) |
54 | # include <sys/kauth.h> |
55 | #endif |
56 | #if (__NetBSD_Version__ >= 799003000) |
57 | #include <sys/module.h> |
58 | #include <sys/mutex.h> |
59 | #endif |
60 | |
61 | #include <net/if.h> |
62 | #include <net/route.h> |
63 | #include <netinet/in.h> |
64 | #include <netinet/in_var.h> |
65 | #include <netinet/in_systm.h> |
66 | #include <netinet/ip.h> |
67 | #include <netinet/ip_var.h> |
68 | #include <netinet/tcp.h> |
69 | #if __NetBSD_Version__ >= 105190000 /* 1.5T */ |
70 | # include <netinet/tcp_timer.h> |
71 | # include <netinet/tcp_var.h> |
72 | #endif |
73 | #include <netinet/udp.h> |
74 | #include <netinet/tcpip.h> |
75 | #include <netinet/ip_icmp.h> |
76 | #include "netinet/ip_compat.h" |
77 | #ifdef USE_INET6 |
78 | # include <netinet/icmp6.h> |
79 | # if (__NetBSD_Version__ >= 106000000) |
80 | # include <netinet6/nd6.h> |
81 | # endif |
82 | #endif |
83 | #include "netinet/ip_fil.h" |
84 | #include "netinet/ip_nat.h" |
85 | #include "netinet/ip_frag.h" |
86 | #include "netinet/ip_state.h" |
87 | #include "netinet/ip_proxy.h" |
88 | #include "netinet/ip_auth.h" |
89 | #include "netinet/ip_sync.h" |
90 | #include "netinet/ip_lookup.h" |
91 | #include "netinet/ip_dstlist.h" |
92 | #ifdef IPFILTER_SCAN |
93 | #include "netinet/ip_scan.h" |
94 | #endif |
95 | #include <sys/md5.h> |
96 | #include <sys/kernel.h> |
97 | #include <sys/conf.h> |
98 | #ifdef INET |
99 | extern int ip_optcopy (struct ip *, struct ip *); |
100 | #endif |
101 | |
102 | #ifdef IPFILTER_M_IPFILTER |
103 | MALLOC_DEFINE(M_IPFILTER, "IP Filter" , "IP Filter packet filter data structures" ); |
104 | #endif |
105 | |
106 | #if __NetBSD_Version__ >= 105009999 |
107 | # define csuminfo csum_flags |
108 | #endif |
109 | |
110 | #if __NetBSD_Version__ < 200000000 |
111 | extern struct protosw inetsw[]; |
112 | #endif |
113 | |
114 | #if (__NetBSD_Version__ >= 599002000) |
115 | static kauth_listener_t ipf_listener; |
116 | #endif |
117 | |
118 | #if (__NetBSD_Version__ < 399001400) |
119 | extern int ip6_getpmtu (struct route_in6 *, struct route_in6 *, |
120 | struct ifnet *, struct in6_addr *, u_long *, |
121 | int *); |
122 | #endif |
123 | #if (NetBSD >= 199511) |
124 | static int ipfopen(dev_t dev, int flags, int devtype, PROC_T *p); |
125 | static int ipfclose(dev_t dev, int flags, int devtype, PROC_T *p); |
126 | #else |
127 | # if (__NetBSD_Version__ >= 399001400) |
128 | static int ipfopen(dev_t dev, int flags, struct lwp *); |
129 | static int ipfclose(dev_t dev, int flags, struct lwp *); |
130 | # else |
131 | static int ipfopen(dev_t dev, int flags); |
132 | static int ipfclose(dev_t dev, int flags); |
133 | # endif /* __NetBSD_Version__ >= 399001400 */ |
134 | #endif |
135 | static int ipfread(dev_t, struct uio *, int ioflag); |
136 | static int ipfwrite(dev_t, struct uio *, int ioflag); |
137 | static int ipfpoll(dev_t, int events, PROC_T *); |
138 | static void ipf_timer_func(void *ptr); |
139 | |
140 | const struct cdevsw ipl_cdevsw = { |
141 | .d_open = ipfopen, |
142 | .d_close = ipfclose, |
143 | .d_read = ipfread, |
144 | .d_write = ipfwrite, |
145 | .d_ioctl = ipfioctl, |
146 | .d_stop = nostop, |
147 | .d_tty = notty, |
148 | .d_poll = ipfpoll, |
149 | .d_mmap = nommap, |
150 | #if (__NetBSD_Version__ >= 200000000) |
151 | .d_kqfilter = nokqfilter, |
152 | #endif |
153 | .d_discard = nodiscard, |
154 | #ifdef D_OTHER |
155 | .d_flag = D_OTHER |
156 | #else |
157 | .d_flag = 0 |
158 | #endif |
159 | }; |
160 | #if (__NetBSD_Version__ >= 799003000) |
161 | kmutex_t ipf_ref_mutex; |
162 | int ipf_active; |
163 | #endif |
164 | |
165 | ipf_main_softc_t ipfmain; |
166 | |
167 | static u_short ipid = 0; |
168 | static int (*ipf_savep)(void *, ip_t *, int, void *, int, struct mbuf **); |
169 | static int ipf_send_ip(fr_info_t *, mb_t *); |
170 | #ifdef USE_INET6 |
171 | static int ipf_fastroute6(struct mbuf *, struct mbuf **, |
172 | fr_info_t *, frdest_t *); |
173 | #endif |
174 | |
175 | #if defined(NETBSD_PF) |
176 | # include <net/pfil.h> |
177 | /* |
178 | * We provide the ipf_checkp name just to minimize changes later. |
179 | */ |
180 | int (*ipf_checkp)(void *, ip_t *ip, int hlen, void *ifp, int out, mb_t **mp); |
181 | #endif /* NETBSD_PF */ |
182 | |
183 | #if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) |
184 | # include <net/pfil.h> |
185 | |
186 | static int ipf_check_wrapper(void *, struct mbuf **, struct ifnet *, int ); |
187 | |
188 | static int |
189 | ipf_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) |
190 | { |
191 | struct ip *ip; |
192 | int rv, hlen; |
193 | |
194 | #if __NetBSD_Version__ >= 200080000 |
195 | /* |
196 | * ensure that mbufs are writable beforehand |
197 | * as it's assumed by ipf code. |
198 | * XXX inefficient |
199 | */ |
200 | int error = m_makewritable(mp, 0, M_COPYALL, M_DONTWAIT); |
201 | |
202 | if (error) { |
203 | m_freem(*mp); |
204 | *mp = NULL; |
205 | return error; |
206 | } |
207 | #endif |
208 | ip = mtod(*mp, struct ip *); |
209 | hlen = ip->ip_hl << 2; |
210 | |
211 | #ifdef INET |
212 | #if defined(M_CSUM_TCPv4) |
213 | /* |
214 | * If the packet is out-bound, we can't delay checksums |
215 | * here. For in-bound, the checksum has already been |
216 | * validated. |
217 | */ |
218 | if (dir == PFIL_OUT) { |
219 | if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { |
220 | in_delayed_cksum(*mp); |
221 | (*mp)->m_pkthdr.csum_flags &= |
222 | ~(M_CSUM_TCPv4|M_CSUM_UDPv4); |
223 | } |
224 | } |
225 | #endif /* M_CSUM_TCPv4 */ |
226 | #endif /* INET */ |
227 | |
228 | /* |
229 | * Note, we don't need to update the checksum, because |
230 | * it has already been verified. |
231 | */ |
232 | rv = ipf_check(&ipfmain, ip, hlen, ifp, (dir == PFIL_OUT), mp); |
233 | |
234 | return (rv); |
235 | } |
236 | |
237 | # ifdef USE_INET6 |
238 | # include <netinet/ip6.h> |
239 | |
240 | static int ipf_check_wrapper6(void *, struct mbuf **, struct ifnet *, int ); |
241 | |
242 | static int |
243 | ipf_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) |
244 | { |
245 | #if defined(INET6) |
246 | # if defined(M_CSUM_TCPv6) && (__NetBSD_Version__ > 200000000) |
247 | /* |
248 | * If the packet is out-bound, we can't delay checksums |
249 | * here. For in-bound, the checksum has already been |
250 | * validated. |
251 | */ |
252 | if (dir == PFIL_OUT) { |
253 | if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) { |
254 | # if (__NetBSD_Version__ > 399000600) |
255 | in6_delayed_cksum(*mp); |
256 | # endif |
257 | (*mp)->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv6| |
258 | M_CSUM_UDPv6); |
259 | } |
260 | } |
261 | # endif |
262 | #endif /* INET6 */ |
263 | |
264 | return (ipf_check(&ipfmain, mtod(*mp, struct ip *), sizeof(struct ip6_hdr), |
265 | ifp, (dir == PFIL_OUT), mp)); |
266 | } |
267 | # endif |
268 | |
269 | |
270 | # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) |
271 | static int ipf_pfilsync(void *, struct mbuf **, struct ifnet *, int); |
272 | |
273 | static int |
274 | ipf_pfilsync(void *hdr, struct mbuf **mp, struct ifnet *ifp, int dir) |
275 | { |
276 | /* |
277 | * The interface pointer is useless for create (we have nothing to |
278 | * compare it to) and at detach, the interface name is still in the |
279 | * list of active NICs (albeit, down, but that's not any real |
280 | * indicator) and doing ifunit() on the name will still return the |
281 | * pointer, so it's not much use then, either. |
282 | */ |
283 | ipf_sync(&ipfmain, NULL); |
284 | return 0; |
285 | } |
286 | # endif |
287 | |
288 | #endif /* __NetBSD_Version__ >= 105110000 */ |
289 | |
290 | |
291 | #if defined(IPFILTER_LKM) |
292 | int |
293 | ipf_identify(s) |
294 | char *s; |
295 | { |
296 | if (strcmp(s, "ipl" ) == 0) |
297 | return 1; |
298 | return 0; |
299 | } |
300 | #endif /* IPFILTER_LKM */ |
301 | |
302 | #if (__NetBSD_Version__ >= 599002000) |
303 | static int |
304 | ipf_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, |
305 | void *arg0, void *arg1, void *arg2, void *arg3) |
306 | { |
307 | int result; |
308 | enum kauth_network_req req; |
309 | |
310 | result = KAUTH_RESULT_DEFER; |
311 | req = (enum kauth_network_req)arg0; |
312 | |
313 | if (action != KAUTH_NETWORK_FIREWALL) |
314 | return result; |
315 | |
316 | /* These must have came from device context. */ |
317 | if ((req == KAUTH_REQ_NETWORK_FIREWALL_FW) || |
318 | (req == KAUTH_REQ_NETWORK_FIREWALL_NAT)) |
319 | result = KAUTH_RESULT_ALLOW; |
320 | |
321 | return result; |
322 | } |
323 | #endif |
324 | |
325 | /* |
326 | * Try to detect the case when compiling for NetBSD with pseudo-device |
327 | */ |
328 | void |
329 | ipfilterattach(int count) |
330 | { |
331 | |
332 | #if (__NetBSD_Version__ >= 799003000) |
333 | return; |
334 | #else |
335 | #if (__NetBSD_Version__ >= 599002000) |
336 | ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, |
337 | ipf_listener_cb, NULL); |
338 | #endif |
339 | |
340 | if (ipf_load_all() == 0) |
341 | (void) ipf_create_all(&ipfmain); |
342 | #endif |
343 | } |
344 | |
345 | |
346 | int |
347 | ipfattach(ipf_main_softc_t *softc) |
348 | { |
349 | SPL_INT(s); |
350 | #if (__NetBSD_Version__ >= 499005500) |
351 | int i; |
352 | #endif |
353 | #if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000) |
354 | int error = 0; |
355 | # if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) |
356 | pfil_head_t *ph_inet; |
357 | # ifdef USE_INET6 |
358 | pfil_head_t *ph_inet6; |
359 | # endif |
360 | # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) |
361 | pfil_head_t *ph_ifsync; |
362 | # endif |
363 | # endif |
364 | #endif |
365 | |
366 | SPL_NET(s); |
367 | if ((softc->ipf_running > 0) || (ipf_checkp == ipf_check)) { |
368 | printf("IP Filter: already initialized\n" ); |
369 | SPL_X(s); |
370 | IPFERROR(130017); |
371 | return EBUSY; |
372 | } |
373 | |
374 | if (ipf_init_all(softc) < 0) { |
375 | SPL_X(s); |
376 | IPFERROR(130015); |
377 | return EIO; |
378 | } |
379 | |
380 | #ifdef NETBSD_PF |
381 | # if (__NetBSD_Version__ >= 104200000) |
382 | # if __NetBSD_Version__ >= 105110000 |
383 | ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET); |
384 | # ifdef USE_INET6 |
385 | ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6); |
386 | # endif |
387 | # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) |
388 | ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0); |
389 | # endif |
390 | |
391 | if (ph_inet == NULL |
392 | # ifdef USE_INET6 |
393 | && ph_inet6 == NULL |
394 | # endif |
395 | # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) |
396 | && ph_ifsync == NULL |
397 | # endif |
398 | ) { |
399 | SPL_X(s); |
400 | IPFERROR(130016); |
401 | return ENODEV; |
402 | } |
403 | |
404 | if (ph_inet != NULL) |
405 | error = pfil_add_hook((void *)ipf_check_wrapper, NULL, |
406 | PFIL_IN|PFIL_OUT, ph_inet); |
407 | else |
408 | error = 0; |
409 | # else |
410 | error = pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, |
411 | &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); |
412 | # endif |
413 | if (error) { |
414 | IPFERROR(130013); |
415 | goto pfil_error; |
416 | } |
417 | # else |
418 | pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); |
419 | # endif |
420 | |
421 | # ifdef USE_INET6 |
422 | # if __NetBSD_Version__ >= 105110000 |
423 | if (ph_inet6 != NULL) |
424 | error = pfil_add_hook((void *)ipf_check_wrapper6, NULL, |
425 | PFIL_IN|PFIL_OUT, ph_inet6); |
426 | else |
427 | error = 0; |
428 | if (error) { |
429 | pfil_remove_hook((void *)ipf_check_wrapper6, NULL, |
430 | PFIL_IN|PFIL_OUT, ph_inet6); |
431 | ipfmain.ipf_interror = 130014; |
432 | goto pfil_error; |
433 | } |
434 | # else |
435 | error = pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, |
436 | &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); |
437 | if (error) { |
438 | pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, |
439 | &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); |
440 | IPFERROR(130014); |
441 | goto pfil_error; |
442 | } |
443 | # endif |
444 | # endif |
445 | |
446 | # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) |
447 | if (ph_ifsync != NULL) |
448 | (void) pfil_add_hook((void *)ipf_pfilsync, NULL, |
449 | PFIL_IFNET, ph_ifsync); |
450 | # endif |
451 | #endif |
452 | |
453 | #if (__NetBSD_Version__ >= 499005500) |
454 | for (i = 0; i < IPL_LOGSIZE; i++) |
455 | selinit(&ipfmain.ipf_selwait[i]); |
456 | #else |
457 | bzero((char *)ipfmain.ipf_selwait, sizeof(ipfmain.ipf_selwait)); |
458 | #endif |
459 | ipf_savep = ipf_checkp; |
460 | ipf_checkp = ipf_check; |
461 | |
462 | #ifdef INET |
463 | if (softc->ipf_control_forwarding & 1) |
464 | ipforwarding = 1; |
465 | #endif |
466 | |
467 | ipid = 0; |
468 | |
469 | SPL_X(s); |
470 | |
471 | #if (__NetBSD_Version__ >= 104010000) |
472 | # if (__NetBSD_Version__ >= 499002000) |
473 | callout_init(&softc->ipf_slow_ch, 0); |
474 | # else |
475 | callout_init(&softc->ipf_slow_ch); |
476 | # endif |
477 | callout_reset(&softc->ipf_slow_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT, |
478 | ipf_timer_func, softc); |
479 | #else |
480 | timeout(ipf_timer_func, softc, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); |
481 | #endif |
482 | |
483 | return 0; |
484 | |
485 | #if __NetBSD_Version__ >= 105110000 |
486 | pfil_error: |
487 | SPL_X(s); |
488 | ipf_fini_all(softc); |
489 | return error; |
490 | #endif |
491 | } |
492 | |
493 | static void |
494 | ipf_timer_func(void *ptr) |
495 | { |
496 | ipf_main_softc_t *softc = ptr; |
497 | SPL_INT(s); |
498 | |
499 | SPL_NET(s); |
500 | READ_ENTER(&softc->ipf_global); |
501 | |
502 | if (softc->ipf_running > 0) |
503 | ipf_slowtimer(softc); |
504 | |
505 | if (softc->ipf_running == -1 || softc->ipf_running == 1) { |
506 | #if NETBSD_GE_REV(104240000) |
507 | callout_reset(&softc->ipf_slow_ch, hz / 2, |
508 | ipf_timer_func, softc); |
509 | #else |
510 | timeout(ipf_timer_func, softc, |
511 | (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); |
512 | #endif |
513 | } |
514 | RWLOCK_EXIT(&softc->ipf_global); |
515 | SPL_X(s); |
516 | } |
517 | |
518 | |
519 | /* |
520 | * Disable the filter by removing the hooks from the IP input/output |
521 | * stream. |
522 | */ |
523 | int |
524 | ipfdetach(ipf_main_softc_t *softc) |
525 | { |
526 | SPL_INT(s); |
527 | #if (__NetBSD_Version__ >= 499005500) |
528 | int i; |
529 | #endif |
530 | #if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000) |
531 | int error = 0; |
532 | # if __NetBSD_Version__ >= 105150000 |
533 | pfil_head_t *ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET); |
534 | # ifdef USE_INET6 |
535 | pfil_head_t *ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6); |
536 | # endif |
537 | # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) |
538 | struct pfil_head *ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0); |
539 | # endif |
540 | # endif |
541 | #endif |
542 | |
543 | SPL_NET(s); |
544 | |
545 | #if (__NetBSD_Version__ >= 104010000) |
546 | if (softc->ipf_running > 0) |
547 | callout_stop(&softc->ipf_slow_ch); |
548 | #else |
549 | untimeout(ipf_slowtimer, NULL); |
550 | #endif /* NetBSD */ |
551 | |
552 | ipf_checkp = ipf_savep; |
553 | (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE); |
554 | (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE); |
555 | |
556 | #ifdef INET |
557 | if (softc->ipf_control_forwarding & 2) |
558 | ipforwarding = 0; |
559 | #endif |
560 | |
561 | #ifdef NETBSD_PF |
562 | # if (__NetBSD_Version__ >= 104200000) |
563 | # if __NetBSD_Version__ >= 105110000 |
564 | # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) |
565 | (void) pfil_remove_hook((void *)ipf_pfilsync, NULL, |
566 | PFIL_IFNET, ph_ifsync); |
567 | # endif |
568 | |
569 | if (ph_inet != NULL) |
570 | error = pfil_remove_hook((void *)ipf_check_wrapper, NULL, |
571 | PFIL_IN|PFIL_OUT, ph_inet); |
572 | else |
573 | error = 0; |
574 | # else |
575 | error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, |
576 | &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); |
577 | # endif |
578 | if (error) { |
579 | SPL_X(s); |
580 | IPFERROR(130011); |
581 | return error; |
582 | } |
583 | # else |
584 | pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); |
585 | # endif |
586 | # ifdef USE_INET6 |
587 | # if __NetBSD_Version__ >= 105110000 |
588 | if (ph_inet6 != NULL) |
589 | error = pfil_remove_hook((void *)ipf_check_wrapper6, NULL, |
590 | PFIL_IN|PFIL_OUT, ph_inet6); |
591 | else |
592 | error = 0; |
593 | # else |
594 | error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, |
595 | &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); |
596 | # endif |
597 | if (error) { |
598 | SPL_X(s); |
599 | IPFERROR(130012); |
600 | return error; |
601 | } |
602 | # endif |
603 | #endif |
604 | SPL_X(s); |
605 | |
606 | #if (__NetBSD_Version__ >= 499005500) |
607 | for (i = 0; i < IPL_LOGSIZE; i++) |
608 | seldestroy(&ipfmain.ipf_selwait[i]); |
609 | #endif |
610 | |
611 | ipf_fini_all(softc); |
612 | |
613 | return 0; |
614 | } |
615 | |
616 | |
617 | /* |
618 | * Filter ioctl interface. |
619 | */ |
620 | int |
621 | ipfioctl(dev_t dev, u_long cmd, |
622 | #if (__NetBSD_Version__ >= 499001000) |
623 | void *data, |
624 | #else |
625 | caddr_t data, |
626 | #endif |
627 | int mode |
628 | #if (NetBSD >= 199511) |
629 | # if (__NetBSD_Version__ >= 399001400) |
630 | , struct lwp *p |
631 | # if (__NetBSD_Version__ >= 399002000) |
632 | # define UID(l) kauth_cred_getuid((l)->l_cred) |
633 | # else |
634 | # define UID(l) ((l)->l_proc->p_cred->p_ruid) |
635 | # endif |
636 | # else |
637 | , struct proc *p |
638 | # define UID(p) ((p)->p_cred->p_ruid) |
639 | # endif |
640 | #endif |
641 | ) |
642 | { |
643 | int error = 0, unit = 0; |
644 | SPL_INT(s); |
645 | |
646 | #if (__NetBSD_Version__ >= 399002000) |
647 | if ((mode & FWRITE) && |
648 | kauth_authorize_network(p->l_cred, KAUTH_NETWORK_FIREWALL, |
649 | KAUTH_REQ_NETWORK_FIREWALL_FW, NULL, |
650 | NULL, NULL)) { |
651 | ipfmain.ipf_interror = 130005; |
652 | return EPERM; |
653 | } |
654 | #else |
655 | if ((securelevel >= 2) && (mode & FWRITE)) { |
656 | ipfmain.ipf_interror = 130001; |
657 | return EPERM; |
658 | } |
659 | #endif |
660 | |
661 | unit = GET_MINOR(dev); |
662 | if ((IPL_LOGMAX < unit) || (unit < 0)) { |
663 | ipfmain.ipf_interror = 130002; |
664 | return ENXIO; |
665 | } |
666 | |
667 | if (ipfmain.ipf_running <= 0) { |
668 | if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) { |
669 | ipfmain.ipf_interror = 130003; |
670 | return EIO; |
671 | } |
672 | if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && |
673 | cmd != SIOCIPFSET && cmd != SIOCFRENB && |
674 | cmd != SIOCGETFS && cmd != SIOCGETFF && |
675 | cmd != SIOCIPFINTERROR) { |
676 | ipfmain.ipf_interror = 130004; |
677 | return EIO; |
678 | } |
679 | } |
680 | |
681 | SPL_NET(s); |
682 | |
683 | error = ipf_ioctlswitch(&ipfmain, unit, data, cmd, mode, UID(p), p); |
684 | if (error != -1) { |
685 | SPL_X(s); |
686 | return error; |
687 | } |
688 | |
689 | SPL_X(s); |
690 | return error; |
691 | } |
692 | |
693 | |
694 | /* |
695 | * ipf_send_reset - this could conceivably be a call to tcp_respond(), but that |
696 | * requires a large amount of setting up and isn't any more efficient. |
697 | */ |
698 | int |
699 | ipf_send_reset(fr_info_t *fin) |
700 | { |
701 | struct tcphdr *tcp, *tcp2; |
702 | int tlen = 0, hlen; |
703 | struct mbuf *m; |
704 | #ifdef USE_INET6 |
705 | ip6_t *ip6; |
706 | #endif |
707 | ip_t *ip; |
708 | |
709 | tcp = fin->fin_dp; |
710 | if (tcp->th_flags & TH_RST) |
711 | return -1; /* feedback loop */ |
712 | |
713 | if (ipf_checkl4sum(fin) == -1) |
714 | return -1; |
715 | |
716 | tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + |
717 | ((tcp->th_flags & TH_SYN) ? 1 : 0) + |
718 | ((tcp->th_flags & TH_FIN) ? 1 : 0); |
719 | |
720 | #ifdef USE_INET6 |
721 | hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); |
722 | #else |
723 | hlen = sizeof(ip_t); |
724 | #endif |
725 | #ifdef MGETHDR |
726 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
727 | #else |
728 | MGET(m, M_DONTWAIT, MT_HEADER); |
729 | #endif |
730 | if (m == NULL) |
731 | return -1; |
732 | if (sizeof(*tcp2) + hlen > MHLEN) { |
733 | MCLGET(m, M_DONTWAIT); |
734 | if (m == NULL) |
735 | return -1; |
736 | if ((m->m_flags & M_EXT) == 0) { |
737 | FREE_MB_T(m); |
738 | return -1; |
739 | } |
740 | } |
741 | |
742 | m->m_len = sizeof(*tcp2) + hlen; |
743 | m->m_data += max_linkhdr; |
744 | m->m_pkthdr.len = m->m_len; |
745 | m_reset_rcvif(m); |
746 | ip = mtod(m, struct ip *); |
747 | bzero((char *)ip, hlen); |
748 | #ifdef USE_INET6 |
749 | ip6 = (ip6_t *)ip; |
750 | #endif |
751 | bzero((char *)ip, sizeof(*tcp2) + hlen); |
752 | tcp2 = (struct tcphdr *)((char *)ip + hlen); |
753 | tcp2->th_sport = tcp->th_dport; |
754 | tcp2->th_dport = tcp->th_sport; |
755 | |
756 | if (tcp->th_flags & TH_ACK) { |
757 | tcp2->th_seq = tcp->th_ack; |
758 | tcp2->th_flags = TH_RST; |
759 | tcp2->th_ack = 0; |
760 | } else { |
761 | tcp2->th_seq = 0; |
762 | tcp2->th_ack = ntohl(tcp->th_seq); |
763 | tcp2->th_ack += tlen; |
764 | tcp2->th_ack = htonl(tcp2->th_ack); |
765 | tcp2->th_flags = TH_RST|TH_ACK; |
766 | } |
767 | tcp2->th_x2 = 0; |
768 | TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); |
769 | tcp2->th_win = tcp->th_win; |
770 | tcp2->th_sum = 0; |
771 | tcp2->th_urp = 0; |
772 | |
773 | #ifdef USE_INET6 |
774 | if (fin->fin_v == 6) { |
775 | ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; |
776 | ip6->ip6_plen = htons(sizeof(struct tcphdr)); |
777 | ip6->ip6_nxt = IPPROTO_TCP; |
778 | ip6->ip6_hlim = 0; |
779 | ip6->ip6_src = fin->fin_dst6.in6; |
780 | ip6->ip6_dst = fin->fin_src6.in6; |
781 | tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, |
782 | sizeof(*ip6), sizeof(*tcp2)); |
783 | return ipf_send_ip(fin, m); |
784 | } |
785 | #endif |
786 | #ifdef INET |
787 | ip->ip_p = IPPROTO_TCP; |
788 | ip->ip_len = htons(sizeof(struct tcphdr)); |
789 | ip->ip_src.s_addr = fin->fin_daddr; |
790 | ip->ip_dst.s_addr = fin->fin_saddr; |
791 | tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); |
792 | ip->ip_len = hlen + sizeof(*tcp2); |
793 | return ipf_send_ip(fin, m); |
794 | #else |
795 | return 0; |
796 | #endif |
797 | } |
798 | |
799 | |
800 | /* |
801 | * Expects ip_len to be in host byte order when called. |
802 | */ |
803 | static int |
804 | ipf_send_ip(fr_info_t *fin, mb_t *m) |
805 | { |
806 | fr_info_t fnew; |
807 | #ifdef INET |
808 | ip_t *oip; |
809 | #endif |
810 | ip_t *ip; |
811 | int hlen; |
812 | |
813 | ip = mtod(m, ip_t *); |
814 | bzero((char *)&fnew, sizeof(fnew)); |
815 | fnew.fin_main_soft = fin->fin_main_soft; |
816 | |
817 | IP_V_A(ip, fin->fin_v); |
818 | switch (fin->fin_v) |
819 | { |
820 | #ifdef INET |
821 | case 4 : |
822 | oip = fin->fin_ip; |
823 | hlen = sizeof(*oip); |
824 | fnew.fin_v = 4; |
825 | fnew.fin_p = ip->ip_p; |
826 | fnew.fin_plen = ntohs(ip->ip_len); |
827 | HTONS(ip->ip_len); |
828 | IP_HL_A(ip, sizeof(*oip) >> 2); |
829 | ip->ip_tos = oip->ip_tos; |
830 | ip->ip_id = ipf_nextipid(fin); |
831 | ip->ip_off = htons(ip_mtudisc ? IP_DF : 0); |
832 | ip->ip_ttl = ip_defttl; |
833 | ip->ip_sum = 0; |
834 | break; |
835 | #endif |
836 | #ifdef USE_INET6 |
837 | case 6 : |
838 | { |
839 | ip6_t *ip6 = (ip6_t *)ip; |
840 | |
841 | ip6->ip6_vfc = 0x60; |
842 | ip6->ip6_hlim = IPDEFTTL; |
843 | |
844 | hlen = sizeof(*ip6); |
845 | fnew.fin_p = ip6->ip6_nxt; |
846 | fnew.fin_v = 6; |
847 | fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen; |
848 | break; |
849 | } |
850 | #endif |
851 | default : |
852 | return EINVAL; |
853 | } |
854 | #ifdef KAME_IPSEC |
855 | m_reset_rcvif(m); |
856 | #endif |
857 | |
858 | fnew.fin_ifp = fin->fin_ifp; |
859 | fnew.fin_flx = FI_NOCKSUM; |
860 | fnew.fin_m = m; |
861 | fnew.fin_ip = ip; |
862 | fnew.fin_mp = &m; |
863 | fnew.fin_hlen = hlen; |
864 | fnew.fin_dp = (char *)ip + hlen; |
865 | (void) ipf_makefrip(hlen, ip, &fnew); |
866 | |
867 | return ipf_fastroute(m, &m, &fnew, NULL); |
868 | } |
869 | |
870 | |
871 | int |
872 | ipf_send_icmp_err(int type, fr_info_t *fin, int dst) |
873 | { |
874 | int err, hlen, xtra, iclen, ohlen, avail; |
875 | struct in_addr dst4; |
876 | struct icmp *icmp; |
877 | struct mbuf *m; |
878 | i6addr_t dst6; |
879 | void *ifp; |
880 | #ifdef USE_INET6 |
881 | int code; |
882 | ip6_t *ip6; |
883 | #endif |
884 | ip_t *ip, *ip2; |
885 | |
886 | if ((type < 0) || (type > ICMP_MAXTYPE)) |
887 | return -1; |
888 | |
889 | #ifdef USE_INET6 |
890 | code = fin->fin_icode; |
891 | if ((code < 0) || (code >= sizeof(icmptoicmp6unreach)/sizeof(int))) |
892 | return -1; |
893 | #endif |
894 | |
895 | if (ipf_checkl4sum(fin) == -1) |
896 | return -1; |
897 | #ifdef MGETHDR |
898 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
899 | #else |
900 | MGET(m, M_DONTWAIT, MT_HEADER); |
901 | #endif |
902 | if (m == NULL) |
903 | return -1; |
904 | avail = MHLEN; |
905 | |
906 | xtra = 0; |
907 | hlen = 0; |
908 | ohlen = 0; |
909 | dst4.s_addr = 0; |
910 | ifp = fin->fin_ifp; |
911 | if (fin->fin_v == 4) { |
912 | if ((fin->fin_p == IPPROTO_ICMP) && !(fin->fin_flx & FI_SHORT)) |
913 | switch (ntohs(fin->fin_data[0]) >> 8) |
914 | { |
915 | case ICMP_ECHO : |
916 | case ICMP_TSTAMP : |
917 | case ICMP_IREQ : |
918 | case ICMP_MASKREQ : |
919 | break; |
920 | default : |
921 | FREE_MB_T(m); |
922 | return 0; |
923 | } |
924 | |
925 | if (dst == 0) { |
926 | if (ipf_ifpaddr(&ipfmain, 4, FRI_NORMAL, ifp, |
927 | &dst6, NULL) == -1) { |
928 | FREE_MB_T(m); |
929 | return -1; |
930 | } |
931 | dst4 = dst6.in4; |
932 | } else |
933 | dst4.s_addr = fin->fin_daddr; |
934 | |
935 | hlen = sizeof(ip_t); |
936 | ohlen = fin->fin_hlen; |
937 | iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; |
938 | if (fin->fin_hlen < fin->fin_plen) |
939 | xtra = MIN(fin->fin_dlen, 8); |
940 | else |
941 | xtra = 0; |
942 | } |
943 | |
944 | #ifdef USE_INET6 |
945 | else if (fin->fin_v == 6) { |
946 | hlen = sizeof(ip6_t); |
947 | ohlen = sizeof(ip6_t); |
948 | iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; |
949 | type = icmptoicmp6types[type]; |
950 | if (type == ICMP6_DST_UNREACH) |
951 | code = icmptoicmp6unreach[code]; |
952 | |
953 | if (iclen + max_linkhdr + fin->fin_plen > avail) { |
954 | MCLGET(m, M_DONTWAIT); |
955 | if (m == NULL) |
956 | return -1; |
957 | if ((m->m_flags & M_EXT) == 0) { |
958 | FREE_MB_T(m); |
959 | return -1; |
960 | } |
961 | avail = MCLBYTES; |
962 | } |
963 | xtra = MIN(fin->fin_plen, avail - iclen - max_linkhdr); |
964 | xtra = MIN(xtra, IPV6_MMTU - iclen); |
965 | if (dst == 0) { |
966 | if (ipf_ifpaddr(&ipfmain, 6, FRI_NORMAL, ifp, |
967 | &dst6, NULL) == -1) { |
968 | FREE_MB_T(m); |
969 | return -1; |
970 | } |
971 | } else |
972 | dst6 = fin->fin_dst6; |
973 | } |
974 | #endif |
975 | else { |
976 | FREE_MB_T(m); |
977 | return -1; |
978 | } |
979 | |
980 | avail -= (max_linkhdr + iclen); |
981 | if (avail < 0) { |
982 | FREE_MB_T(m); |
983 | return -1; |
984 | } |
985 | if (xtra > avail) |
986 | xtra = avail; |
987 | iclen += xtra; |
988 | m->m_data += max_linkhdr; |
989 | m_reset_rcvif(m); |
990 | m->m_pkthdr.len = iclen; |
991 | m->m_len = iclen; |
992 | ip = mtod(m, ip_t *); |
993 | icmp = (struct icmp *)((char *)ip + hlen); |
994 | ip2 = (ip_t *)&icmp->icmp_ip; |
995 | |
996 | icmp->icmp_type = type; |
997 | icmp->icmp_code = fin->fin_icode; |
998 | icmp->icmp_cksum = 0; |
999 | #ifdef icmp_nextmtu |
1000 | if (type == ICMP_UNREACH && fin->fin_icode == ICMP_UNREACH_NEEDFRAG) { |
1001 | if (fin->fin_mtu != 0) { |
1002 | icmp->icmp_nextmtu = htons(fin->fin_mtu); |
1003 | |
1004 | } else if (ifp != NULL) { |
1005 | icmp->icmp_nextmtu = htons(GETIFMTU_4(ifp)); |
1006 | |
1007 | } else { /* make up a number... */ |
1008 | icmp->icmp_nextmtu = htons(fin->fin_plen - 20); |
1009 | } |
1010 | } |
1011 | #endif |
1012 | |
1013 | bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); |
1014 | |
1015 | #if defined(M_CSUM_IPv4) |
1016 | /* |
1017 | * Clear any in-bound checksum flags for this packet. |
1018 | */ |
1019 | m->m_pkthdr.csuminfo = 0; |
1020 | #endif /* __NetBSD__ && M_CSUM_IPv4 */ |
1021 | |
1022 | #ifdef USE_INET6 |
1023 | ip6 = (ip6_t *)ip; |
1024 | if (fin->fin_v == 6) { |
1025 | ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; |
1026 | ip6->ip6_plen = htons(iclen - hlen); |
1027 | ip6->ip6_nxt = IPPROTO_ICMPV6; |
1028 | ip6->ip6_hlim = 0; |
1029 | ip6->ip6_src = dst6.in6; |
1030 | ip6->ip6_dst = fin->fin_src6.in6; |
1031 | if (xtra > 0) |
1032 | bcopy((char *)fin->fin_ip + ohlen, |
1033 | (char *)&icmp->icmp_ip + ohlen, xtra); |
1034 | icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, |
1035 | sizeof(*ip6), iclen - hlen); |
1036 | } else |
1037 | #endif |
1038 | { |
1039 | ip->ip_p = IPPROTO_ICMP; |
1040 | ip->ip_src.s_addr = dst4.s_addr; |
1041 | ip->ip_dst.s_addr = fin->fin_saddr; |
1042 | |
1043 | if (xtra > 0) |
1044 | bcopy((char *)fin->fin_ip + ohlen, |
1045 | (char *)&icmp->icmp_ip + ohlen, xtra); |
1046 | icmp->icmp_cksum = ipf_cksum((u_short *)icmp, |
1047 | sizeof(*icmp) + 8); |
1048 | ip->ip_len = iclen; |
1049 | ip->ip_p = IPPROTO_ICMP; |
1050 | } |
1051 | err = ipf_send_ip(fin, m); |
1052 | return err; |
1053 | } |
1054 | |
1055 | |
1056 | /* |
1057 | * m0 - pointer to mbuf where the IP packet starts |
1058 | * mpp - pointer to the mbuf pointer that is the start of the mbuf chain |
1059 | */ |
1060 | int |
1061 | ipf_fastroute(mb_t *m0, mb_t **mpp, fr_info_t *fin, frdest_t *fdp) |
1062 | { |
1063 | register struct ip *ip, *mhip; |
1064 | register struct mbuf *m = *mpp; |
1065 | register struct route *ro; |
1066 | int len, off, error = 0, hlen, code; |
1067 | struct ifnet *ifp, *sifp; |
1068 | ipf_main_softc_t *softc; |
1069 | #if __NetBSD_Version__ >= 499001100 |
1070 | union { |
1071 | struct sockaddr dst; |
1072 | struct sockaddr_in dst4; |
1073 | } u; |
1074 | #else |
1075 | struct sockaddr_in *dst4; |
1076 | #endif |
1077 | struct sockaddr *dst; |
1078 | u_short ip_off, ip_len; |
1079 | struct route iproute; |
1080 | struct rtentry *rt; |
1081 | frdest_t node; |
1082 | frentry_t *fr; |
1083 | |
1084 | if (fin->fin_v == 6) { |
1085 | #ifdef USE_INET6 |
1086 | error = ipf_fastroute6(m0, mpp, fin, fdp); |
1087 | #else |
1088 | error = EPROTONOSUPPORT; |
1089 | #endif |
1090 | if ((error != 0) && (*mpp != NULL)) |
1091 | FREE_MB_T(*mpp); |
1092 | return error; |
1093 | } |
1094 | #ifndef INET |
1095 | FREE_MB_T(*mpp); |
1096 | return EPROTONOSUPPORT; |
1097 | #else |
1098 | |
1099 | hlen = fin->fin_hlen; |
1100 | ip = mtod(m0, struct ip *); |
1101 | softc = fin->fin_main_soft; |
1102 | rt = NULL; |
1103 | ifp = NULL; |
1104 | |
1105 | # if defined(M_CSUM_IPv4) |
1106 | /* |
1107 | * Clear any in-bound checksum flags for this packet. |
1108 | */ |
1109 | m0->m_pkthdr.csuminfo = 0; |
1110 | # endif /* __NetBSD__ && M_CSUM_IPv4 */ |
1111 | |
1112 | /* |
1113 | * Route packet. |
1114 | */ |
1115 | ro = &iproute; |
1116 | memset(ro, 0, sizeof(*ro)); |
1117 | fr = fin->fin_fr; |
1118 | |
1119 | if ((fr != NULL) && !(fr->fr_flags & FR_KEEPSTATE) && (fdp != NULL) && |
1120 | (fdp->fd_type == FRD_DSTLIST)) { |
1121 | if (ipf_dstlist_select_node(fin, fdp->fd_ptr, NULL, &node) == 0) |
1122 | fdp = &node; |
1123 | } |
1124 | if (fdp != NULL) |
1125 | ifp = fdp->fd_ptr; |
1126 | else |
1127 | ifp = fin->fin_ifp; |
1128 | |
1129 | if ((ifp == NULL) && ((fr == NULL) || !(fr->fr_flags & FR_FASTROUTE))) { |
1130 | error = -2; |
1131 | goto bad; |
1132 | } |
1133 | |
1134 | # if __NetBSD_Version__ >= 499001100 |
1135 | if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) |
1136 | sockaddr_in_init(&u.dst4, &fdp->fd_ip, 0); |
1137 | else |
1138 | sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); |
1139 | dst = &u.dst; |
1140 | rtcache_setdst(ro, dst); |
1141 | rt = rtcache_init(ro); |
1142 | # else |
1143 | dst4 = (struct sockaddr_in *)&ro->ro_dst; |
1144 | dst = (struct sockaddr *)dst4; |
1145 | dst4->sin_family = AF_INET; |
1146 | dst4->sin_addr = ip->ip_dst; |
1147 | |
1148 | if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) |
1149 | dst4->sin_addr = fdp->fd_ip; |
1150 | |
1151 | dst4->sin_len = sizeof(*dst); |
1152 | rtalloc(ro); |
1153 | rt = ro->ro_rt; |
1154 | # endif |
1155 | if ((ifp == NULL) && (rt != NULL)) |
1156 | ifp = rt->rt_ifp; |
1157 | if ((rt == NULL) || (ifp == NULL)) { |
1158 | #ifdef INET |
1159 | if (in_localaddr(ip->ip_dst)) |
1160 | error = EHOSTUNREACH; |
1161 | else |
1162 | #endif |
1163 | error = ENETUNREACH; |
1164 | goto bad; |
1165 | } |
1166 | |
1167 | |
1168 | if (rt->rt_flags & RTF_GATEWAY) |
1169 | dst = rt->rt_gateway; |
1170 | |
1171 | rt->rt_use++; |
1172 | |
1173 | /* |
1174 | * For input packets which are being "fastrouted", they won't |
1175 | * go back through output filtering and miss their chance to get |
1176 | * NAT'd and counted. Duplicated packets aren't considered to be |
1177 | * part of the normal packet stream, so do not NAT them or pass |
1178 | * them through stateful checking, etc. |
1179 | */ |
1180 | if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) { |
1181 | sifp = fin->fin_ifp; |
1182 | fin->fin_ifp = ifp; |
1183 | fin->fin_out = 1; |
1184 | (void) ipf_acctpkt(fin, NULL); |
1185 | fin->fin_fr = NULL; |
1186 | if (!fr || !(fr->fr_flags & FR_RETMASK)) { |
1187 | u_32_t pass; |
1188 | |
1189 | (void) ipf_state_check(fin, &pass); |
1190 | } |
1191 | |
1192 | switch (ipf_nat_checkout(fin, NULL)) |
1193 | { |
1194 | case 0 : |
1195 | break; |
1196 | case 1 : |
1197 | ip->ip_sum = 0; |
1198 | break; |
1199 | case -1 : |
1200 | error = -1; |
1201 | goto bad; |
1202 | break; |
1203 | } |
1204 | |
1205 | fin->fin_ifp = sifp; |
1206 | fin->fin_out = 0; |
1207 | } else |
1208 | ip->ip_sum = 0; |
1209 | /* |
1210 | * If small enough for interface, can just send directly. |
1211 | */ |
1212 | m_set_rcvif(m, ifp); |
1213 | |
1214 | ip_len = ntohs(ip->ip_len); |
1215 | if (ip_len <= ifp->if_mtu) { |
1216 | # if defined(M_CSUM_IPv4) |
1217 | # if (__NetBSD_Version__ >= 105009999) |
1218 | if (ifp->if_csum_flags_tx & M_CSUM_IPv4) |
1219 | m->m_pkthdr.csuminfo |= M_CSUM_IPv4; |
1220 | # else |
1221 | if (ifp->if_capabilities & IFCAP_CSUM_IPv4) |
1222 | m->m_pkthdr.csuminfo |= M_CSUM_IPv4; |
1223 | # endif /* (__NetBSD_Version__ >= 105009999) */ |
1224 | else if (ip->ip_sum == 0) |
1225 | ip->ip_sum = in_cksum(m, hlen); |
1226 | # else |
1227 | if (!ip->ip_sum) |
1228 | ip->ip_sum = in_cksum(m, hlen); |
1229 | # endif /* M_CSUM_IPv4 */ |
1230 | |
1231 | error = if_output_lock(ifp, ifp, m, dst, rt); |
1232 | goto done; |
1233 | } |
1234 | |
1235 | /* |
1236 | * Too large for interface; fragment if possible. |
1237 | * Must be able to put at least 8 bytes per fragment. |
1238 | */ |
1239 | ip_off = ntohs(ip->ip_off); |
1240 | if (ip_off & IP_DF) { |
1241 | error = EMSGSIZE; |
1242 | goto bad; |
1243 | } |
1244 | len = (ifp->if_mtu - hlen) &~ 7; |
1245 | if (len < 8) { |
1246 | error = EMSGSIZE; |
1247 | goto bad; |
1248 | } |
1249 | |
1250 | { |
1251 | int mhlen, firstlen = len; |
1252 | struct mbuf **mnext = &m->m_act; |
1253 | |
1254 | /* |
1255 | * Loop through length of segment after first fragment, |
1256 | * make new header and copy data of each part and link onto chain. |
1257 | */ |
1258 | m0 = m; |
1259 | mhlen = sizeof (struct ip); |
1260 | for (off = hlen + len; off < ip_len; off += len) { |
1261 | # ifdef MGETHDR |
1262 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
1263 | # else |
1264 | MGET(m, M_DONTWAIT, MT_HEADER); |
1265 | # endif |
1266 | if (m == 0) { |
1267 | m = m0; |
1268 | error = ENOBUFS; |
1269 | goto bad; |
1270 | } |
1271 | m->m_data += max_linkhdr; |
1272 | mhip = mtod(m, struct ip *); |
1273 | bcopy((char *)ip, (char *)mhip, sizeof(*ip)); |
1274 | #ifdef INET |
1275 | if (hlen > sizeof (struct ip)) { |
1276 | mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); |
1277 | IP_HL_A(mhip, mhlen >> 2); |
1278 | } |
1279 | #endif |
1280 | m->m_len = mhlen; |
1281 | mhip->ip_off = ((off - hlen) >> 3) + ip_off; |
1282 | if (off + len >= ip_len) |
1283 | len = ip_len - off; |
1284 | else |
1285 | mhip->ip_off |= IP_MF; |
1286 | mhip->ip_len = htons((u_short)(len + mhlen)); |
1287 | m->m_next = m_copy(m0, off, len); |
1288 | if (m->m_next == 0) { |
1289 | error = ENOBUFS; /* ??? */ |
1290 | goto sendorfree; |
1291 | } |
1292 | m->m_pkthdr.len = mhlen + len; |
1293 | m_reset_rcvif(m); |
1294 | mhip->ip_off = htons((u_short)mhip->ip_off); |
1295 | mhip->ip_sum = 0; |
1296 | #ifdef INET |
1297 | mhip->ip_sum = in_cksum(m, mhlen); |
1298 | #endif |
1299 | *mnext = m; |
1300 | mnext = &m->m_act; |
1301 | } |
1302 | /* |
1303 | * Update first fragment by trimming what's been copied out |
1304 | * and updating header, then send each fragment (in order). |
1305 | */ |
1306 | m_adj(m0, hlen + firstlen - ip_len); |
1307 | ip->ip_len = htons((u_short)(hlen + firstlen)); |
1308 | ip->ip_off = htons((u_short)IP_MF); |
1309 | ip->ip_sum = 0; |
1310 | #ifdef INET |
1311 | ip->ip_sum = in_cksum(m0, hlen); |
1312 | #endif |
1313 | sendorfree: |
1314 | for (m = m0; m; m = m0) { |
1315 | m0 = m->m_act; |
1316 | m->m_act = 0; |
1317 | if (error == 0) { |
1318 | KERNEL_LOCK(1, NULL); |
1319 | error = (*ifp->if_output)(ifp, m, dst, rt); |
1320 | KERNEL_UNLOCK_ONE(NULL); |
1321 | } else { |
1322 | FREE_MB_T(m); |
1323 | } |
1324 | } |
1325 | } |
1326 | done: |
1327 | if (!error) |
1328 | softc->ipf_frouteok[0]++; |
1329 | else |
1330 | softc->ipf_frouteok[1]++; |
1331 | |
1332 | # if __NetBSD_Version__ >= 499001100 |
1333 | rtcache_free(ro); |
1334 | # else |
1335 | if (rt) { |
1336 | RTFREE(rt); |
1337 | } |
1338 | # endif |
1339 | return error; |
1340 | bad: |
1341 | if (error == EMSGSIZE) { |
1342 | sifp = fin->fin_ifp; |
1343 | code = fin->fin_icode; |
1344 | fin->fin_icode = ICMP_UNREACH_NEEDFRAG; |
1345 | fin->fin_ifp = ifp; |
1346 | (void) ipf_send_icmp_err(ICMP_UNREACH, fin, 1); |
1347 | fin->fin_ifp = sifp; |
1348 | fin->fin_icode = code; |
1349 | } |
1350 | FREE_MB_T(m); |
1351 | goto done; |
1352 | #endif /* INET */ |
1353 | } |
1354 | |
1355 | |
1356 | #if defined(USE_INET6) |
1357 | /* |
1358 | * This is the IPv6 specific fastroute code. It doesn't clean up the mbuf's |
1359 | * or ensure that it is an IPv6 packet that is being forwarded, those are |
1360 | * expected to be done by the called (ipf_fastroute). |
1361 | */ |
1362 | static int |
1363 | ipf_fastroute6(struct mbuf *m0, struct mbuf **mpp, fr_info_t *fin, |
1364 | frdest_t *fdp) |
1365 | { |
1366 | # if __NetBSD_Version__ >= 499001100 |
1367 | struct route ip6route; |
1368 | const struct sockaddr *dst; |
1369 | union { |
1370 | struct sockaddr dst; |
1371 | struct sockaddr_in6 dst6; |
1372 | } u; |
1373 | struct route *ro; |
1374 | # else |
1375 | struct route_in6 ip6route; |
1376 | struct sockaddr_in6 *dst6; |
1377 | struct route_in6 *ro; |
1378 | # endif |
1379 | struct rtentry *rt; |
1380 | struct ifnet *ifp; |
1381 | u_long mtu; |
1382 | int error; |
1383 | |
1384 | error = 0; |
1385 | ro = &ip6route; |
1386 | |
1387 | if (fdp != NULL) |
1388 | ifp = fdp->fd_ptr; |
1389 | else |
1390 | ifp = fin->fin_ifp; |
1391 | memset(ro, 0, sizeof(*ro)); |
1392 | # if __NetBSD_Version__ >= 499001100 |
1393 | if (fdp != NULL && IP6_NOTZERO(&fdp->fd_ip6)) |
1394 | sockaddr_in6_init(&u.dst6, &fdp->fd_ip6.in6, 0, 0, 0); |
1395 | else |
1396 | sockaddr_in6_init(&u.dst6, &fin->fin_fi.fi_dst.in6, 0, 0, 0); |
1397 | dst = &u.dst; |
1398 | rtcache_setdst(ro, dst); |
1399 | |
1400 | rt = rtcache_init(ro); |
1401 | if ((ifp == NULL) && (rt != NULL)) |
1402 | ifp = rt->rt_ifp; |
1403 | # else |
1404 | dst6 = (struct sockaddr_in6 *)&ro->ro_dst; |
1405 | dst6->sin6_family = AF_INET6; |
1406 | dst6->sin6_len = sizeof(struct sockaddr_in6); |
1407 | dst6->sin6_addr = fin->fin_fi.fi_dst.in6; |
1408 | |
1409 | if (fdp != NULL) { |
1410 | if (IP6_NOTZERO(&fdp->fd_ip6)) |
1411 | dst6->sin6_addr = fdp->fd_ip6.in6; |
1412 | } |
1413 | |
1414 | rtalloc((struct route *)ro); |
1415 | |
1416 | if ((ifp == NULL) && (ro->ro_rt != NULL)) |
1417 | ifp = ro->ro_rt->rt_ifp; |
1418 | rt = ro->ro_rt; |
1419 | # endif |
1420 | if ((rt == NULL) || (ifp == NULL)) { |
1421 | |
1422 | error = EHOSTUNREACH; |
1423 | goto bad; |
1424 | } |
1425 | |
1426 | /* KAME */ |
1427 | # if __NetBSD_Version__ >= 499001100 |
1428 | if (IN6_IS_ADDR_LINKLOCAL(&u.dst6.sin6_addr)) |
1429 | u.dst6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); |
1430 | # else |
1431 | if (IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) |
1432 | dst6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); |
1433 | # endif |
1434 | |
1435 | { |
1436 | # if (__NetBSD_Version__ >= 106010000) && !defined(IN6_LINKMTU) |
1437 | struct in6_ifextra *ife; |
1438 | # endif |
1439 | if (rt->rt_flags & RTF_GATEWAY) |
1440 | # if __NetBSD_Version__ >= 499001100 |
1441 | dst = rt->rt_gateway; |
1442 | # else |
1443 | dst6 = (struct sockaddr_in6 *)rt->rt_gateway; |
1444 | # endif |
1445 | rt->rt_use++; |
1446 | |
1447 | /* Determine path MTU. */ |
1448 | # if (__NetBSD_Version__ <= 106009999) |
1449 | mtu = nd_ifinfo[ifp->if_index].linkmtu; |
1450 | # else |
1451 | # ifdef IN6_LINKMTU |
1452 | mtu = IN6_LINKMTU(ifp); |
1453 | # else |
1454 | ife = (struct in6_ifextra *)(ifp)->if_afdata[AF_INET6]; |
1455 | mtu = ife->nd_ifinfo[ifp->if_index].linkmtu; |
1456 | # endif |
1457 | # endif |
1458 | if ((error == 0) && (m0->m_pkthdr.len <= mtu)) { |
1459 | # if __NetBSD_Version__ >= 499001100 |
1460 | error = nd6_output(ifp, ifp, m0, satocsin6(dst), rt); |
1461 | # else |
1462 | error = nd6_output(ifp, ifp, m0, dst6, rt); |
1463 | # endif |
1464 | } else { |
1465 | error = EMSGSIZE; |
1466 | } |
1467 | } |
1468 | bad: |
1469 | # if __NetBSD_Version__ >= 499001100 |
1470 | rtcache_free(ro); |
1471 | # else |
1472 | if (ro->ro_rt != NULL) { |
1473 | RTFREE(((struct route *)ro)->ro_rt); |
1474 | } |
1475 | # endif |
1476 | return error; |
1477 | } |
1478 | #endif /* INET6 */ |
1479 | |
1480 | |
1481 | int |
1482 | ipf_verifysrc(fr_info_t *fin) |
1483 | { |
1484 | #if __NetBSD_Version__ >= 499001100 |
1485 | union { |
1486 | struct sockaddr dst; |
1487 | struct sockaddr_in dst4; |
1488 | } u; |
1489 | struct rtentry *rt; |
1490 | #else |
1491 | struct sockaddr_in *dst; |
1492 | #endif |
1493 | struct route iproute; |
1494 | int rc; |
1495 | |
1496 | #if __NetBSD_Version__ >= 499001100 |
1497 | sockaddr_in_init(&u.dst4, &fin->fin_src, 0); |
1498 | rtcache_setdst(&iproute, &u.dst); |
1499 | rt = rtcache_init(&iproute); |
1500 | if (rt == NULL) |
1501 | rc = 0; |
1502 | else |
1503 | rc = (fin->fin_ifp == rt->rt_ifp); |
1504 | rtcache_free(&iproute); |
1505 | #else |
1506 | dst = (struct sockaddr_in *)&iproute.ro_dst; |
1507 | dst->sin_len = sizeof(*dst); |
1508 | dst->sin_family = AF_INET; |
1509 | dst->sin_addr = fin->fin_src; |
1510 | rtalloc(&iproute); |
1511 | if (iproute.ro_rt == NULL) |
1512 | return 0; |
1513 | rc = (fin->fin_ifp == iproute.ro_rt->rt_ifp); |
1514 | RTFREE(iproute.ro_rt); |
1515 | #endif |
1516 | return rc; |
1517 | } |
1518 | |
1519 | |
1520 | /* |
1521 | * return the first IP Address associated with an interface |
1522 | */ |
1523 | int |
1524 | ipf_ifpaddr(ipf_main_softc_t *softc, int v, int atype, void *ifptr, |
1525 | i6addr_t *inp, i6addr_t *inpmask) |
1526 | { |
1527 | #ifdef USE_INET6 |
1528 | struct in6_addr *inp6 = NULL; |
1529 | #endif |
1530 | struct sockaddr *sock, *mask; |
1531 | struct sockaddr_in *sin; |
1532 | struct ifaddr *ifa; |
1533 | struct ifnet *ifp; |
1534 | |
1535 | if ((ifptr == NULL) || (ifptr == (void *)-1)) |
1536 | return -1; |
1537 | |
1538 | ifp = ifptr; |
1539 | mask = NULL; |
1540 | |
1541 | if (v == 4) |
1542 | inp->in4.s_addr = 0; |
1543 | #ifdef USE_INET6 |
1544 | else if (v == 6) |
1545 | bzero((char *)inp, sizeof(*inp)); |
1546 | #endif |
1547 | |
1548 | ifa = IFADDR_READER_FIRST(ifp); |
1549 | sock = ifa ? ifa->ifa_addr : NULL; |
1550 | while (sock != NULL && ifa != NULL) { |
1551 | sin = (struct sockaddr_in *)sock; |
1552 | if ((v == 4) && (sin->sin_family == AF_INET)) |
1553 | break; |
1554 | #ifdef USE_INET6 |
1555 | if ((v == 6) && (sin->sin_family == AF_INET6)) { |
1556 | inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; |
1557 | if (!IN6_IS_ADDR_LINKLOCAL(inp6) && |
1558 | !IN6_IS_ADDR_LOOPBACK(inp6)) |
1559 | break; |
1560 | } |
1561 | #endif |
1562 | ifa = IFADDR_READER_NEXT(ifa); |
1563 | if (ifa != NULL) |
1564 | sock = ifa->ifa_addr; |
1565 | } |
1566 | if (ifa == NULL || sock == NULL) |
1567 | return -1; |
1568 | |
1569 | mask = ifa->ifa_netmask; |
1570 | if (atype == FRI_BROADCAST) |
1571 | sock = ifa->ifa_broadaddr; |
1572 | else if (atype == FRI_PEERADDR) |
1573 | sock = ifa->ifa_dstaddr; |
1574 | |
1575 | #ifdef USE_INET6 |
1576 | if (v == 6) |
1577 | return ipf_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, |
1578 | (struct sockaddr_in6 *)mask, |
1579 | inp, inpmask); |
1580 | #endif |
1581 | return ipf_ifpfillv4addr(atype, (struct sockaddr_in *)sock, |
1582 | (struct sockaddr_in *)mask, |
1583 | &inp->in4, &inpmask->in4); |
1584 | } |
1585 | |
1586 | |
1587 | u_32_t |
1588 | ipf_newisn(fr_info_t *fin) |
1589 | { |
1590 | #if __NetBSD_Version__ >= 105190000 /* 1.5T */ |
1591 | size_t asz; |
1592 | |
1593 | if (fin->fin_v == 4) |
1594 | asz = sizeof(struct in_addr); |
1595 | else if (fin->fin_v == 6) |
1596 | asz = sizeof(fin->fin_src); |
1597 | else /* XXX: no way to return error */ |
1598 | return 0; |
1599 | #ifdef INET |
1600 | return tcp_new_iss1((void *)&fin->fin_src, (void *)&fin->fin_dst, |
1601 | fin->fin_sport, fin->fin_dport, asz, 0); |
1602 | #else |
1603 | return ENOSYS; |
1604 | #endif |
1605 | #else |
1606 | static int iss_seq_off = 0; |
1607 | u_char hash[16]; |
1608 | u_32_t newiss; |
1609 | MD5_CTX ctx; |
1610 | |
1611 | /* |
1612 | * Compute the base value of the ISS. It is a hash |
1613 | * of (saddr, sport, daddr, dport, secret). |
1614 | */ |
1615 | MD5Init(&ctx); |
1616 | |
1617 | MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, |
1618 | sizeof(fin->fin_fi.fi_src)); |
1619 | MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, |
1620 | sizeof(fin->fin_fi.fi_dst)); |
1621 | MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); |
1622 | |
1623 | MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); |
1624 | |
1625 | MD5Final(hash, &ctx); |
1626 | |
1627 | memcpy(&newiss, hash, sizeof(newiss)); |
1628 | |
1629 | /* |
1630 | * Now increment our "timer", and add it in to |
1631 | * the computed value. |
1632 | * |
1633 | * XXX Use `addin'? |
1634 | * XXX TCP_ISSINCR too large to use? |
1635 | */ |
1636 | iss_seq_off += 0x00010000; |
1637 | newiss += iss_seq_off; |
1638 | return newiss; |
1639 | #endif |
1640 | } |
1641 | |
1642 | |
1643 | /* ------------------------------------------------------------------------ */ |
1644 | /* Function: ipf_nextipid */ |
1645 | /* Returns: int - 0 == success, -1 == error (packet should be droppped) */ |
1646 | /* Parameters: fin(I) - pointer to packet information */ |
1647 | /* */ |
1648 | /* Returns the next IPv4 ID to use for this packet. */ |
1649 | /* ------------------------------------------------------------------------ */ |
1650 | u_short |
1651 | ipf_nextipid(fr_info_t *fin) |
1652 | { |
1653 | #ifdef USE_MUTEXES |
1654 | ipf_main_softc_t *softc = fin->fin_main_soft; |
1655 | #endif |
1656 | u_short id; |
1657 | |
1658 | MUTEX_ENTER(&softc->ipf_rw); |
1659 | id = ipid++; |
1660 | MUTEX_EXIT(&softc->ipf_rw); |
1661 | |
1662 | return id; |
1663 | } |
1664 | |
1665 | |
1666 | EXTERN_INLINE int |
1667 | ipf_checkv4sum(fr_info_t *fin) |
1668 | { |
1669 | #ifdef M_CSUM_TCP_UDP_BAD |
1670 | int manual, pflag, cflags, active; |
1671 | mb_t *m; |
1672 | |
1673 | if ((fin->fin_flx & FI_NOCKSUM) != 0) |
1674 | return 0; |
1675 | |
1676 | if ((fin->fin_flx & FI_SHORT) != 0) |
1677 | return 1; |
1678 | |
1679 | if (fin->fin_cksum != FI_CK_NEEDED) |
1680 | return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; |
1681 | |
1682 | manual = 0; |
1683 | m = fin->fin_m; |
1684 | if (m == NULL) { |
1685 | manual = 1; |
1686 | goto skipauto; |
1687 | } |
1688 | |
1689 | switch (fin->fin_p) |
1690 | { |
1691 | case IPPROTO_UDP : |
1692 | pflag = M_CSUM_UDPv4; |
1693 | break; |
1694 | case IPPROTO_TCP : |
1695 | pflag = M_CSUM_TCPv4; |
1696 | break; |
1697 | default : |
1698 | pflag = 0; |
1699 | manual = 1; |
1700 | break; |
1701 | } |
1702 | |
1703 | active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; |
1704 | active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; |
1705 | cflags = m->m_pkthdr.csum_flags & active; |
1706 | |
1707 | if (pflag != 0) { |
1708 | if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { |
1709 | fin->fin_flx |= FI_BAD; |
1710 | fin->fin_cksum = FI_CK_BAD; |
1711 | } else if (cflags == (pflag | M_CSUM_DATA)) { |
1712 | if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) { |
1713 | fin->fin_flx |= FI_BAD; |
1714 | fin->fin_cksum = FI_CK_BAD; |
1715 | } else { |
1716 | fin->fin_cksum = FI_CK_SUMOK; |
1717 | } |
1718 | } else if (cflags == pflag) { |
1719 | fin->fin_cksum = FI_CK_SUMOK; |
1720 | } else { |
1721 | manual = 1; |
1722 | } |
1723 | } |
1724 | skipauto: |
1725 | if (manual != 0) { |
1726 | if (ipf_checkl4sum(fin) == -1) { |
1727 | fin->fin_flx |= FI_BAD; |
1728 | return -1; |
1729 | } |
1730 | } |
1731 | #else |
1732 | if (ipf_checkl4sum(fin) == -1) { |
1733 | fin->fin_flx |= FI_BAD; |
1734 | return -1; |
1735 | } |
1736 | #endif |
1737 | return 0; |
1738 | } |
1739 | |
1740 | |
1741 | #ifdef USE_INET6 |
1742 | EXTERN_INLINE int |
1743 | ipf_checkv6sum(fr_info_t *fin) |
1744 | { |
1745 | # ifdef M_CSUM_TCP_UDP_BAD |
1746 | int manual, pflag, cflags, active; |
1747 | mb_t *m; |
1748 | |
1749 | if ((fin->fin_flx & FI_NOCKSUM) != 0) |
1750 | return 0; |
1751 | |
1752 | if ((fin->fin_flx & FI_SHORT) != 0) |
1753 | return 1; |
1754 | |
1755 | if (fin->fin_cksum != FI_CK_SUMOK) |
1756 | return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; |
1757 | |
1758 | |
1759 | manual = 0; |
1760 | m = fin->fin_m; |
1761 | |
1762 | switch (fin->fin_p) |
1763 | { |
1764 | case IPPROTO_UDP : |
1765 | pflag = M_CSUM_UDPv6; |
1766 | break; |
1767 | case IPPROTO_TCP : |
1768 | pflag = M_CSUM_TCPv6; |
1769 | break; |
1770 | default : |
1771 | pflag = 0; |
1772 | manual = 1; |
1773 | break; |
1774 | } |
1775 | |
1776 | active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; |
1777 | active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; |
1778 | cflags = m->m_pkthdr.csum_flags & active; |
1779 | |
1780 | if (pflag != 0) { |
1781 | if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { |
1782 | fin->fin_flx |= FI_BAD; |
1783 | } else if (cflags == (pflag | M_CSUM_DATA)) { |
1784 | if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) |
1785 | fin->fin_flx |= FI_BAD; |
1786 | } else if (cflags == pflag) { |
1787 | ; |
1788 | } else { |
1789 | manual = 1; |
1790 | } |
1791 | } |
1792 | if (manual != 0) { |
1793 | if (ipf_checkl4sum(fin) == -1) { |
1794 | fin->fin_flx |= FI_BAD; |
1795 | return -1; |
1796 | } |
1797 | } |
1798 | # else |
1799 | if (ipf_checkl4sum(fin) == -1) { |
1800 | fin->fin_flx |= FI_BAD; |
1801 | return -1; |
1802 | } |
1803 | # endif |
1804 | return 0; |
1805 | } |
1806 | #endif /* USE_INET6 */ |
1807 | |
1808 | |
1809 | size_t |
1810 | mbufchainlen(struct mbuf *m0) |
1811 | { |
1812 | size_t len; |
1813 | |
1814 | if ((m0->m_flags & M_PKTHDR) != 0) { |
1815 | len = m0->m_pkthdr.len; |
1816 | } else { |
1817 | struct mbuf *m; |
1818 | |
1819 | for (m = m0, len = 0; m != NULL; m = m->m_next) |
1820 | len += m->m_len; |
1821 | } |
1822 | return len; |
1823 | } |
1824 | |
1825 | |
1826 | /* ------------------------------------------------------------------------ */ |
1827 | /* Function: ipf_pullup */ |
1828 | /* Returns: NULL == pullup failed, else pointer to protocol header */ |
1829 | /* Parameters: xmin(I)- pointer to buffer where data packet starts */ |
1830 | /* fin(I) - pointer to packet information */ |
1831 | /* len(I) - number of bytes to pullup */ |
1832 | /* */ |
1833 | /* Attempt to move at least len bytes (from the start of the buffer) into a */ |
1834 | /* single buffer for ease of access. Operating system native functions are */ |
1835 | /* used to manage buffers - if necessary. If the entire packet ends up in */ |
1836 | /* a single buffer, set the FI_COALESCE flag even though ipf_coalesce() has */ |
1837 | /* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ |
1838 | /* and ONLY if the pullup succeeds. */ |
1839 | /* */ |
1840 | /* We assume that 'xmin' is a pointer to a buffer that is part of the chain */ |
1841 | /* of buffers that starts at *fin->fin_mp. */ |
1842 | /* ------------------------------------------------------------------------ */ |
1843 | void * |
1844 | ipf_pullup(mb_t *xmin, fr_info_t *fin, int len) |
1845 | { |
1846 | int dpoff, ipoff; |
1847 | mb_t *m = xmin; |
1848 | char *ip; |
1849 | |
1850 | if (m == NULL) |
1851 | return NULL; |
1852 | |
1853 | ip = (char *)fin->fin_ip; |
1854 | if ((fin->fin_flx & FI_COALESCE) != 0) |
1855 | return ip; |
1856 | |
1857 | ipoff = fin->fin_ipoff; |
1858 | if (fin->fin_dp != NULL) |
1859 | dpoff = (char *)fin->fin_dp - (char *)ip; |
1860 | else |
1861 | dpoff = 0; |
1862 | |
1863 | if (M_LEN(m) < len) { |
1864 | mb_t *n = *fin->fin_mp; |
1865 | /* |
1866 | * Assume that M_PKTHDR is set and just work with what is left |
1867 | * rather than check.. |
1868 | * Should not make any real difference, anyway. |
1869 | */ |
1870 | if (m != n) { |
1871 | /* |
1872 | * Record the mbuf that points to the mbuf that we're |
1873 | * about to go to work on so that we can update the |
1874 | * m_next appropriately later. |
1875 | */ |
1876 | for (; n->m_next != m; n = n->m_next) |
1877 | ; |
1878 | } else { |
1879 | n = NULL; |
1880 | } |
1881 | |
1882 | #ifdef MHLEN |
1883 | if (len > MHLEN) |
1884 | #else |
1885 | if (len > MLEN) |
1886 | #endif |
1887 | { |
1888 | #ifdef HAVE_M_PULLDOWN |
1889 | if (m_pulldown(m, 0, len, NULL) == NULL) |
1890 | m = NULL; |
1891 | #else |
1892 | FREE_MB_T(*fin->fin_mp); |
1893 | m = NULL; |
1894 | n = NULL; |
1895 | #endif |
1896 | } else |
1897 | { |
1898 | m = m_pullup(m, len); |
1899 | } |
1900 | if (n != NULL) |
1901 | n->m_next = m; |
1902 | if (m == NULL) { |
1903 | /* |
1904 | * When n is non-NULL, it indicates that m pointed to |
1905 | * a sub-chain (tail) of the mbuf and that the head |
1906 | * of this chain has not yet been free'd. |
1907 | */ |
1908 | if (n != NULL) { |
1909 | FREE_MB_T(*fin->fin_mp); |
1910 | } |
1911 | |
1912 | *fin->fin_mp = NULL; |
1913 | fin->fin_m = NULL; |
1914 | return NULL; |
1915 | } |
1916 | |
1917 | if (n == NULL) |
1918 | *fin->fin_mp = m; |
1919 | |
1920 | while (M_LEN(m) == 0) { |
1921 | m = m->m_next; |
1922 | } |
1923 | fin->fin_m = m; |
1924 | ip = MTOD(m, char *) + ipoff; |
1925 | |
1926 | fin->fin_ip = (ip_t *)ip; |
1927 | if (fin->fin_dp != NULL) |
1928 | fin->fin_dp = (char *)fin->fin_ip + dpoff; |
1929 | if (fin->fin_fraghdr != NULL) |
1930 | fin->fin_fraghdr = (char *)ip + |
1931 | ((char *)fin->fin_fraghdr - |
1932 | (char *)fin->fin_ip); |
1933 | } |
1934 | |
1935 | if (len == fin->fin_plen) |
1936 | fin->fin_flx |= FI_COALESCE; |
1937 | return ip; |
1938 | } |
1939 | |
1940 | |
1941 | int |
1942 | ipf_inject(fr_info_t *fin, mb_t *m) |
1943 | { |
1944 | int error; |
1945 | |
1946 | if (fin->fin_out == 0) { |
1947 | if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) { |
1948 | FREE_MB_T(m); |
1949 | error = ENOBUFS; |
1950 | } else { |
1951 | error = 0; |
1952 | } |
1953 | } else { |
1954 | error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); |
1955 | } |
1956 | return error; |
1957 | } |
1958 | |
1959 | |
1960 | u_32_t |
1961 | ipf_random(void) |
1962 | { |
1963 | int number; |
1964 | |
1965 | #ifdef _CPRNG_H |
1966 | number = cprng_fast32(); |
1967 | #else |
1968 | number = arc4random(); |
1969 | #endif |
1970 | return number; |
1971 | } |
1972 | |
1973 | |
1974 | /* |
1975 | * routines below for saving IP headers to buffer |
1976 | */ |
1977 | static int ipfopen(dev_t dev, int flags |
1978 | #if (NetBSD >= 199511) |
1979 | , int devtype, PROC_T *p |
1980 | #endif |
1981 | ) |
1982 | { |
1983 | u_int unit = GET_MINOR(dev); |
1984 | int error; |
1985 | |
1986 | if (IPL_LOGMAX < unit) { |
1987 | error = ENXIO; |
1988 | } else { |
1989 | switch (unit) |
1990 | { |
1991 | case IPL_LOGIPF : |
1992 | case IPL_LOGNAT : |
1993 | case IPL_LOGSTATE : |
1994 | case IPL_LOGAUTH : |
1995 | case IPL_LOGLOOKUP : |
1996 | case IPL_LOGSYNC : |
1997 | #ifdef IPFILTER_SCAN |
1998 | case IPL_LOGSCAN : |
1999 | #endif |
2000 | error = 0; |
2001 | break; |
2002 | default : |
2003 | error = ENXIO; |
2004 | break; |
2005 | } |
2006 | } |
2007 | #if (__NetBSD_Version__ >= 799003000) |
2008 | if (error == 0) { |
2009 | mutex_enter(&ipf_ref_mutex); |
2010 | ipf_active = 1; |
2011 | mutex_exit(&ipf_ref_mutex); |
2012 | } |
2013 | #endif |
2014 | return error; |
2015 | } |
2016 | |
2017 | |
2018 | static int ipfclose(dev_t dev, int flags |
2019 | #if (NetBSD >= 199511) |
2020 | , int devtype, PROC_T *p |
2021 | #endif |
2022 | ) |
2023 | { |
2024 | u_int unit = GET_MINOR(dev); |
2025 | |
2026 | if (IPL_LOGMAX < unit) |
2027 | return ENXIO; |
2028 | else { |
2029 | #if (__NetBSD_Version__ >= 799003000) |
2030 | mutex_enter(&ipf_ref_mutex); |
2031 | ipf_active = 0; |
2032 | mutex_exit(&ipf_ref_mutex); |
2033 | #endif |
2034 | return 0; |
2035 | } |
2036 | } |
2037 | |
2038 | /* |
2039 | * ipfread/ipflog |
2040 | * both of these must operate with at least splnet() lest they be |
2041 | * called during packet processing and cause an inconsistancy to appear in |
2042 | * the filter lists. |
2043 | */ |
2044 | static int ipfread(dev_t dev, struct uio *uio, int ioflag) |
2045 | { |
2046 | |
2047 | if (ipfmain.ipf_running < 1) { |
2048 | ipfmain.ipf_interror = 130006; |
2049 | return EIO; |
2050 | } |
2051 | |
2052 | if (GET_MINOR(dev) == IPL_LOGSYNC) |
2053 | return ipf_sync_read(&ipfmain, uio); |
2054 | |
2055 | #ifdef IPFILTER_LOG |
2056 | return ipf_log_read(&ipfmain, GET_MINOR(dev), uio); |
2057 | #else |
2058 | ipfmain.ipf_interror = 130007; |
2059 | return ENXIO; |
2060 | #endif |
2061 | } |
2062 | |
2063 | |
2064 | /* |
2065 | * ipfwrite |
2066 | * both of these must operate with at least splnet() lest they be |
2067 | * called during packet processing and cause an inconsistancy to appear in |
2068 | * the filter lists. |
2069 | */ |
2070 | static int ipfwrite(dev_t dev, struct uio *uio, int ioflag) |
2071 | { |
2072 | |
2073 | if (ipfmain.ipf_running < 1) { |
2074 | ipfmain.ipf_interror = 130008; |
2075 | return EIO; |
2076 | } |
2077 | |
2078 | if (GET_MINOR(dev) == IPL_LOGSYNC) |
2079 | return ipf_sync_write(&ipfmain, uio); |
2080 | ipfmain.ipf_interror = 130009; |
2081 | return ENXIO; |
2082 | } |
2083 | |
2084 | |
2085 | static int ipfpoll(dev_t dev, int events, PROC_T *p) |
2086 | { |
2087 | u_int unit = GET_MINOR(dev); |
2088 | int revents = 0; |
2089 | |
2090 | if (IPL_LOGMAX < unit) { |
2091 | ipfmain.ipf_interror = 130010; |
2092 | return ENXIO; |
2093 | } |
2094 | |
2095 | switch (unit) |
2096 | { |
2097 | case IPL_LOGIPF : |
2098 | case IPL_LOGNAT : |
2099 | case IPL_LOGSTATE : |
2100 | #ifdef IPFILTER_LOG |
2101 | if ((events & (POLLIN | POLLRDNORM)) && |
2102 | ipf_log_canread(&ipfmain, unit)) |
2103 | revents |= events & (POLLIN | POLLRDNORM); |
2104 | #endif |
2105 | break; |
2106 | case IPL_LOGAUTH : |
2107 | if ((events & (POLLIN | POLLRDNORM)) && |
2108 | ipf_auth_waiting(&ipfmain)) |
2109 | revents |= events & (POLLIN | POLLRDNORM); |
2110 | break; |
2111 | case IPL_LOGSYNC : |
2112 | if ((events & (POLLIN | POLLRDNORM)) && |
2113 | ipf_sync_canread(&ipfmain)) |
2114 | revents |= events & (POLLIN | POLLRDNORM); |
2115 | if ((events & (POLLOUT | POLLWRNORM)) && |
2116 | ipf_sync_canwrite(&ipfmain)) |
2117 | revents |= events & (POLLOUT | POLLWRNORM); |
2118 | break; |
2119 | case IPL_LOGSCAN : |
2120 | case IPL_LOGLOOKUP : |
2121 | default : |
2122 | break; |
2123 | } |
2124 | |
2125 | if ((revents == 0) && (((events & (POLLIN|POLLRDNORM)) != 0))) |
2126 | selrecord(p, &ipfmain.ipf_selwait[unit]); |
2127 | return revents; |
2128 | } |
2129 | |
2130 | u_int |
2131 | ipf_pcksum(fr_info_t *fin, int hlen, u_int sum) |
2132 | { |
2133 | struct mbuf *m; |
2134 | u_int sum2; |
2135 | int off; |
2136 | |
2137 | m = fin->fin_m; |
2138 | off = (char *)fin->fin_dp - (char *)fin->fin_ip; |
2139 | m->m_data += hlen; |
2140 | m->m_len -= hlen; |
2141 | sum2 = in_cksum(fin->fin_m, fin->fin_plen - off); |
2142 | m->m_len += hlen; |
2143 | m->m_data -= hlen; |
2144 | |
2145 | /* |
2146 | * Both sum and sum2 are partial sums, so combine them together. |
2147 | */ |
2148 | sum += ~sum2 & 0xffff; |
2149 | while (sum > 0xffff) |
2150 | sum = (sum & 0xffff) + (sum >> 16); |
2151 | sum2 = ~sum & 0xffff; |
2152 | return sum2; |
2153 | } |
2154 | |
2155 | #if (__NetBSD_Version__ >= 799003000) |
2156 | |
2157 | /* NetBSD module interface */ |
2158 | |
2159 | MODULE(MODULE_CLASS_DRIVER, ipl, "bpf_filter" ); |
2160 | |
2161 | static int ipl_init(void *); |
2162 | static int ipl_fini(void *); |
2163 | static int ipl_modcmd(modcmd_t, void *); |
2164 | |
2165 | #ifdef _MODULE |
2166 | static devmajor_t ipl_cmaj = -1, ipl_bmaj = -1; |
2167 | #endif |
2168 | |
2169 | static int |
2170 | ipl_modcmd(modcmd_t cmd, void *opaque) |
2171 | { |
2172 | |
2173 | switch (cmd) { |
2174 | case MODULE_CMD_INIT: |
2175 | return ipl_init(opaque); |
2176 | case MODULE_CMD_FINI: |
2177 | return ipl_fini(opaque); |
2178 | default: |
2179 | return ENOTTY; |
2180 | } |
2181 | } |
2182 | |
2183 | static int |
2184 | ipl_init(void *opaque) |
2185 | { |
2186 | int error; |
2187 | |
2188 | ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, |
2189 | ipf_listener_cb, NULL); |
2190 | |
2191 | if ((error = ipf_load_all()) != 0) |
2192 | return error; |
2193 | |
2194 | if (ipf_create_all(&ipfmain) == NULL) { |
2195 | ipf_unload_all(); |
2196 | return ENODEV; |
2197 | } |
2198 | |
2199 | /* Initialize our mutex and reference count */ |
2200 | mutex_init(&ipf_ref_mutex, MUTEX_DEFAULT, IPL_NONE); |
2201 | ipf_active = 0; |
2202 | |
2203 | #ifdef _MODULE |
2204 | /* |
2205 | * Insert ourself into the cdevsw list. |
2206 | */ |
2207 | error = devsw_attach("ipl" , NULL, &ipl_bmaj, &ipl_cdevsw, &ipl_cmaj); |
2208 | if (error) |
2209 | ipl_fini(opaque); |
2210 | #endif |
2211 | |
2212 | return error; |
2213 | } |
2214 | |
2215 | static int |
2216 | ipl_fini(void *opaque) |
2217 | { |
2218 | |
2219 | #ifdef _MODULE |
2220 | (void)devsw_detach(NULL, &ipl_cdevsw); |
2221 | #endif |
2222 | |
2223 | /* |
2224 | * Grab the mutex, verify that there are no references |
2225 | * and that there are no running filters. If either |
2226 | * of these exists, reinsert our cdevsw entry and return |
2227 | * an error. |
2228 | */ |
2229 | mutex_enter(&ipf_ref_mutex); |
2230 | if (ipf_active != 0 || ipfmain.ipf_running > 0) { |
2231 | #ifdef _MODULE |
2232 | (void)devsw_attach("ipl" , NULL, &ipl_bmaj, |
2233 | &ipl_cdevsw, &ipl_cmaj); |
2234 | #endif |
2235 | mutex_exit(&ipf_ref_mutex); |
2236 | return EBUSY; |
2237 | } |
2238 | |
2239 | /* Clean up the rest of our state before being unloaded */ |
2240 | |
2241 | mutex_exit(&ipf_ref_mutex); |
2242 | mutex_destroy(&ipf_ref_mutex); |
2243 | ipf_destroy_all(&ipfmain); |
2244 | ipf_unload_all(); |
2245 | kauth_unlisten_scope(ipf_listener); |
2246 | |
2247 | return 0; |
2248 | } |
2249 | #endif /* (__NetBSD_Version__ >= 799003000) */ |
2250 | |