1 | /* $NetBSD: ip_sync.c,v 1.5 2013/09/14 12:18:06 martin 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/file.h> |
18 | #if !defined(_KERNEL) && !defined(__KERNEL__) |
19 | # include <stdio.h> |
20 | # include <stdlib.h> |
21 | # include <string.h> |
22 | # define _KERNEL |
23 | # define KERNEL |
24 | # ifdef __OpenBSD__ |
25 | struct file; |
26 | # endif |
27 | # include <sys/uio.h> |
28 | # undef _KERNEL |
29 | # undef KERNEL |
30 | #else |
31 | # include <sys/systm.h> |
32 | # if !defined(__SVR4) && !defined(__svr4__) |
33 | # include <sys/mbuf.h> |
34 | # endif |
35 | # include <sys/select.h> |
36 | # if __FreeBSD_version >= 500000 |
37 | # include <sys/selinfo.h> |
38 | # endif |
39 | #endif |
40 | #if defined(__NetBSD__) && (__NetBSD_Version__ >= 104000000) |
41 | # include <sys/proc.h> |
42 | #endif |
43 | #if defined(_KERNEL) && (__FreeBSD_version >= 220000) |
44 | # include <sys/filio.h> |
45 | # include <sys/fcntl.h> |
46 | #else |
47 | # include <sys/ioctl.h> |
48 | #endif |
49 | #include <sys/time.h> |
50 | #if !defined(linux) |
51 | # include <sys/protosw.h> |
52 | #endif |
53 | #include <sys/socket.h> |
54 | #if defined(__SVR4) || defined(__svr4__) |
55 | # include <sys/filio.h> |
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 | |
64 | #include <net/if.h> |
65 | #ifdef sun |
66 | # include <net/af.h> |
67 | #endif |
68 | #include <netinet/in.h> |
69 | #include <netinet/in_systm.h> |
70 | #include <netinet/ip.h> |
71 | #include <netinet/tcp.h> |
72 | #if !defined(linux) |
73 | # include <netinet/ip_var.h> |
74 | #endif |
75 | #if !defined(__hpux) && !defined(linux) |
76 | # include <netinet/tcp_fsm.h> |
77 | #endif |
78 | #include <netinet/udp.h> |
79 | #include <netinet/ip_icmp.h> |
80 | #include "netinet/ip_compat.h" |
81 | #include <netinet/tcpip.h> |
82 | #include "netinet/ip_fil.h" |
83 | #include "netinet/ip_nat.h" |
84 | #include "netinet/ip_frag.h" |
85 | #include "netinet/ip_state.h" |
86 | #include "netinet/ip_proxy.h" |
87 | #include "netinet/ip_sync.h" |
88 | #ifdef USE_INET6 |
89 | #include <netinet/icmp6.h> |
90 | #endif |
91 | #if (__FreeBSD_version >= 300000) |
92 | # include <sys/malloc.h> |
93 | # if defined(_KERNEL) && !defined(IPFILTER_LKM) |
94 | # include <sys/libkern.h> |
95 | # include <sys/systm.h> |
96 | # endif |
97 | #endif |
98 | /* END OF INCLUDES */ |
99 | |
100 | #if !defined(lint) |
101 | #if defined(__NetBSD__) |
102 | #include <sys/cdefs.h> |
103 | __KERNEL_RCSID(0, "$NetBSD: ip_sync.c,v 1.5 2013/09/14 12:18:06 martin Exp $" ); |
104 | #else |
105 | static const char rcsid[] = "@(#)Id: ip_sync.c,v 1.1.1.2 2012/07/22 13:45:38 darrenr Exp" ; |
106 | #endif |
107 | #endif |
108 | |
109 | #define SYNC_STATETABSZ 256 |
110 | #define SYNC_NATTABSZ 256 |
111 | |
112 | typedef struct ipf_sync_softc_s { |
113 | ipfmutex_t ipf_syncadd; |
114 | ipfmutex_t ipsl_mutex; |
115 | ipfrwlock_t ipf_syncstate; |
116 | ipfrwlock_t ipf_syncnat; |
117 | #if SOLARIS && defined(_KERNEL) |
118 | kcondvar_t ipslwait; |
119 | #endif |
120 | #if defined(linux) && defined(_KERNEL) |
121 | wait_queue_head_t sl_tail_linux; |
122 | #endif |
123 | synclist_t **syncstatetab; |
124 | synclist_t **syncnattab; |
125 | synclogent_t *synclog; |
126 | syncupdent_t *syncupd; |
127 | u_int ipf_sync_num; |
128 | u_int ipf_sync_wrap; |
129 | u_int sl_idx; /* next available sync log entry */ |
130 | u_int su_idx; /* next available sync update entry */ |
131 | u_int sl_tail; /* next sync log entry to read */ |
132 | u_int su_tail; /* next sync update entry to read */ |
133 | int ipf_sync_log_sz; |
134 | int ipf_sync_nat_tab_sz; |
135 | int ipf_sync_state_tab_sz; |
136 | int ipf_sync_debug; |
137 | int ipf_sync_events; |
138 | u_32_t ipf_sync_lastwakeup; |
139 | int ipf_sync_wake_interval; |
140 | int ipf_sync_event_high_wm; |
141 | int ipf_sync_queue_high_wm; |
142 | int ipf_sync_inited; |
143 | } ipf_sync_softc_t; |
144 | |
145 | static int ipf_sync_flush_table(ipf_sync_softc_t *, int, synclist_t **); |
146 | static void ipf_sync_wakeup(ipf_main_softc_t *); |
147 | static void ipf_sync_del(ipf_sync_softc_t *, synclist_t *); |
148 | static void ipf_sync_poll_wakeup(ipf_main_softc_t *); |
149 | static int ipf_sync_nat(ipf_main_softc_t *, synchdr_t *, void *); |
150 | static int ipf_sync_state(ipf_main_softc_t *, synchdr_t *, void *); |
151 | |
152 | # if !defined(sparc) && !defined(__hppa) |
153 | void ipf_sync_tcporder(int, struct tcpdata *); |
154 | void ipf_sync_natorder(int, struct nat *); |
155 | void ipf_sync_storder(int, struct ipstate *); |
156 | # endif |
157 | |
158 | |
159 | void * |
160 | ipf_sync_soft_create(ipf_main_softc_t *softc) |
161 | { |
162 | ipf_sync_softc_t *softs; |
163 | |
164 | KMALLOC(softs, ipf_sync_softc_t *); |
165 | if (softs == NULL) { |
166 | IPFERROR(110024); |
167 | return NULL; |
168 | } |
169 | |
170 | bzero((char *)softs, sizeof(*softs)); |
171 | |
172 | softs->ipf_sync_log_sz = SYNCLOG_SZ; |
173 | softs->ipf_sync_nat_tab_sz = SYNC_STATETABSZ; |
174 | softs->ipf_sync_state_tab_sz = SYNC_STATETABSZ; |
175 | softs->ipf_sync_event_high_wm = SYNCLOG_SZ * 100 / 90; /* 90% */ |
176 | softs->ipf_sync_queue_high_wm = SYNCLOG_SZ * 100 / 90; /* 90% */ |
177 | |
178 | return softs; |
179 | } |
180 | |
181 | |
182 | /* ------------------------------------------------------------------------ */ |
183 | /* Function: ipf_sync_init */ |
184 | /* Returns: int - 0 == success, -1 == failure */ |
185 | /* Parameters: Nil */ |
186 | /* */ |
187 | /* Initialise all of the locks required for the sync code and initialise */ |
188 | /* any data structures, as required. */ |
189 | /* ------------------------------------------------------------------------ */ |
190 | int |
191 | ipf_sync_soft_init(ipf_main_softc_t *softc, void *arg) |
192 | { |
193 | ipf_sync_softc_t *softs = arg; |
194 | |
195 | KMALLOCS(softs->synclog, synclogent_t *, |
196 | softs->ipf_sync_log_sz * sizeof(*softs->synclog)); |
197 | if (softs->synclog == NULL) |
198 | return -1; |
199 | bzero((char *)softs->synclog, |
200 | softs->ipf_sync_log_sz * sizeof(*softs->synclog)); |
201 | |
202 | KMALLOCS(softs->syncupd, syncupdent_t *, |
203 | softs->ipf_sync_log_sz * sizeof(*softs->syncupd)); |
204 | if (softs->syncupd == NULL) |
205 | return -2; |
206 | bzero((char *)softs->syncupd, |
207 | softs->ipf_sync_log_sz * sizeof(*softs->syncupd)); |
208 | |
209 | KMALLOCS(softs->syncstatetab, synclist_t **, |
210 | softs->ipf_sync_state_tab_sz * sizeof(*softs->syncstatetab)); |
211 | if (softs->syncstatetab == NULL) |
212 | return -3; |
213 | bzero((char *)softs->syncstatetab, |
214 | softs->ipf_sync_state_tab_sz * sizeof(*softs->syncstatetab)); |
215 | |
216 | KMALLOCS(softs->syncnattab, synclist_t **, |
217 | softs->ipf_sync_nat_tab_sz * sizeof(*softs->syncnattab)); |
218 | if (softs->syncnattab == NULL) |
219 | return -3; |
220 | bzero((char *)softs->syncnattab, |
221 | softs->ipf_sync_nat_tab_sz * sizeof(*softs->syncnattab)); |
222 | |
223 | softs->ipf_sync_num = 1; |
224 | softs->ipf_sync_wrap = 0; |
225 | softs->sl_idx = 0; |
226 | softs->su_idx = 0; |
227 | softs->sl_tail = 0; |
228 | softs->su_tail = 0; |
229 | softs->ipf_sync_events = 0; |
230 | softs->ipf_sync_lastwakeup = 0; |
231 | |
232 | |
233 | # if SOLARIS && defined(_KERNEL) |
234 | cv_init(&softs->ipslwait, "ipsl condvar" , CV_DRIVER, NULL); |
235 | # endif |
236 | RWLOCK_INIT(&softs->ipf_syncstate, "add things to state sync table" ); |
237 | RWLOCK_INIT(&softs->ipf_syncnat, "add things to nat sync table" ); |
238 | MUTEX_INIT(&softs->ipf_syncadd, "add things to sync table" ); |
239 | MUTEX_INIT(&softs->ipsl_mutex, "read ring lock" ); |
240 | |
241 | softs->ipf_sync_inited = 1; |
242 | |
243 | return 0; |
244 | } |
245 | |
246 | |
247 | /* ------------------------------------------------------------------------ */ |
248 | /* Function: ipf_sync_unload */ |
249 | /* Returns: int - 0 == success, -1 == failure */ |
250 | /* Parameters: Nil */ |
251 | /* */ |
252 | /* Destroy the locks created when initialising and free any memory in use */ |
253 | /* with the synchronisation tables. */ |
254 | /* ------------------------------------------------------------------------ */ |
255 | int |
256 | ipf_sync_soft_fini(ipf_main_softc_t *softc, void *arg) |
257 | { |
258 | ipf_sync_softc_t *softs = arg; |
259 | |
260 | if (softs->syncnattab != NULL) { |
261 | ipf_sync_flush_table(softs, softs->ipf_sync_nat_tab_sz, |
262 | softs->syncnattab); |
263 | KFREES(softs->syncnattab, |
264 | softs->ipf_sync_nat_tab_sz * sizeof(*softs->syncnattab)); |
265 | softs->syncnattab = NULL; |
266 | } |
267 | |
268 | if (softs->syncstatetab != NULL) { |
269 | ipf_sync_flush_table(softs, softs->ipf_sync_state_tab_sz, |
270 | softs->syncstatetab); |
271 | KFREES(softs->syncstatetab, |
272 | softs->ipf_sync_state_tab_sz * |
273 | sizeof(*softs->syncstatetab)); |
274 | softs->syncstatetab = NULL; |
275 | } |
276 | |
277 | if (softs->syncupd != NULL) { |
278 | KFREES(softs->syncupd, |
279 | softs->ipf_sync_log_sz * sizeof(*softs->syncupd)); |
280 | softs->syncupd = NULL; |
281 | } |
282 | |
283 | if (softs->synclog != NULL) { |
284 | KFREES(softs->synclog, |
285 | softs->ipf_sync_log_sz * sizeof(*softs->synclog)); |
286 | softs->synclog = NULL; |
287 | } |
288 | |
289 | if (softs->ipf_sync_inited == 1) { |
290 | MUTEX_DESTROY(&softs->ipsl_mutex); |
291 | MUTEX_DESTROY(&softs->ipf_syncadd); |
292 | RW_DESTROY(&softs->ipf_syncnat); |
293 | RW_DESTROY(&softs->ipf_syncstate); |
294 | softs->ipf_sync_inited = 0; |
295 | } |
296 | |
297 | return 0; |
298 | } |
299 | |
300 | void |
301 | ipf_sync_soft_destroy(ipf_main_softc_t *softc, void *arg) |
302 | { |
303 | ipf_sync_softc_t *softs = arg; |
304 | |
305 | KFREE(softs); |
306 | } |
307 | |
308 | |
309 | # if !defined(sparc) && !defined(__hppa) |
310 | /* ------------------------------------------------------------------------ */ |
311 | /* Function: ipf_sync_tcporder */ |
312 | /* Returns: Nil */ |
313 | /* Parameters: way(I) - direction of byte order conversion. */ |
314 | /* td(IO) - pointer to data to be converted. */ |
315 | /* */ |
316 | /* Do byte swapping on values in the TCP state information structure that */ |
317 | /* need to be used at both ends by the host in their native byte order. */ |
318 | /* ------------------------------------------------------------------------ */ |
319 | void |
320 | ipf_sync_tcporder(int way, tcpdata_t *td) |
321 | { |
322 | if (way) { |
323 | td->td_maxwin = htons(td->td_maxwin); |
324 | td->td_end = htonl(td->td_end); |
325 | td->td_maxend = htonl(td->td_maxend); |
326 | } else { |
327 | td->td_maxwin = ntohs(td->td_maxwin); |
328 | td->td_end = ntohl(td->td_end); |
329 | td->td_maxend = ntohl(td->td_maxend); |
330 | } |
331 | } |
332 | |
333 | |
334 | /* ------------------------------------------------------------------------ */ |
335 | /* Function: ipf_sync_natorder */ |
336 | /* Returns: Nil */ |
337 | /* Parameters: way(I) - direction of byte order conversion. */ |
338 | /* nat(IO) - pointer to data to be converted. */ |
339 | /* */ |
340 | /* Do byte swapping on values in the NAT data structure that need to be */ |
341 | /* used at both ends by the host in their native byte order. */ |
342 | /* ------------------------------------------------------------------------ */ |
343 | void |
344 | ipf_sync_natorder(int way, nat_t *n) |
345 | { |
346 | if (way) { |
347 | n->nat_age = htonl(n->nat_age); |
348 | n->nat_flags = htonl(n->nat_flags); |
349 | n->nat_ipsumd = htonl(n->nat_ipsumd); |
350 | n->nat_use = htonl(n->nat_use); |
351 | n->nat_dir = htonl(n->nat_dir); |
352 | } else { |
353 | n->nat_age = ntohl(n->nat_age); |
354 | n->nat_flags = ntohl(n->nat_flags); |
355 | n->nat_ipsumd = ntohl(n->nat_ipsumd); |
356 | n->nat_use = ntohl(n->nat_use); |
357 | n->nat_dir = ntohl(n->nat_dir); |
358 | } |
359 | } |
360 | |
361 | |
362 | /* ------------------------------------------------------------------------ */ |
363 | /* Function: ipf_sync_storder */ |
364 | /* Returns: Nil */ |
365 | /* Parameters: way(I) - direction of byte order conversion. */ |
366 | /* ips(IO) - pointer to data to be converted. */ |
367 | /* */ |
368 | /* Do byte swapping on values in the IP state data structure that need to */ |
369 | /* be used at both ends by the host in their native byte order. */ |
370 | /* ------------------------------------------------------------------------ */ |
371 | void |
372 | ipf_sync_storder(int way, ipstate_t *ips) |
373 | { |
374 | ipf_sync_tcporder(way, &ips->is_tcp.ts_data[0]); |
375 | ipf_sync_tcporder(way, &ips->is_tcp.ts_data[1]); |
376 | |
377 | if (way) { |
378 | ips->is_hv = htonl(ips->is_hv); |
379 | ips->is_die = htonl(ips->is_die); |
380 | ips->is_pass = htonl(ips->is_pass); |
381 | ips->is_flags = htonl(ips->is_flags); |
382 | ips->is_opt[0] = htonl(ips->is_opt[0]); |
383 | ips->is_opt[1] = htonl(ips->is_opt[1]); |
384 | ips->is_optmsk[0] = htonl(ips->is_optmsk[0]); |
385 | ips->is_optmsk[1] = htonl(ips->is_optmsk[1]); |
386 | ips->is_sec = htons(ips->is_sec); |
387 | ips->is_secmsk = htons(ips->is_secmsk); |
388 | ips->is_auth = htons(ips->is_auth); |
389 | ips->is_authmsk = htons(ips->is_authmsk); |
390 | ips->is_s0[0] = htonl(ips->is_s0[0]); |
391 | ips->is_s0[1] = htonl(ips->is_s0[1]); |
392 | ips->is_smsk[0] = htons(ips->is_smsk[0]); |
393 | ips->is_smsk[1] = htons(ips->is_smsk[1]); |
394 | } else { |
395 | ips->is_hv = ntohl(ips->is_hv); |
396 | ips->is_die = ntohl(ips->is_die); |
397 | ips->is_pass = ntohl(ips->is_pass); |
398 | ips->is_flags = ntohl(ips->is_flags); |
399 | ips->is_opt[0] = ntohl(ips->is_opt[0]); |
400 | ips->is_opt[1] = ntohl(ips->is_opt[1]); |
401 | ips->is_optmsk[0] = ntohl(ips->is_optmsk[0]); |
402 | ips->is_optmsk[1] = ntohl(ips->is_optmsk[1]); |
403 | ips->is_sec = ntohs(ips->is_sec); |
404 | ips->is_secmsk = ntohs(ips->is_secmsk); |
405 | ips->is_auth = ntohs(ips->is_auth); |
406 | ips->is_authmsk = ntohs(ips->is_authmsk); |
407 | ips->is_s0[0] = ntohl(ips->is_s0[0]); |
408 | ips->is_s0[1] = ntohl(ips->is_s0[1]); |
409 | ips->is_smsk[0] = ntohl(ips->is_smsk[0]); |
410 | ips->is_smsk[1] = ntohl(ips->is_smsk[1]); |
411 | } |
412 | } |
413 | # else /* !defined(sparc) && !defined(__hppa) */ |
414 | # define ipf_sync_tcporder(x,y) |
415 | # define ipf_sync_natorder(x,y) |
416 | # define ipf_sync_storder(x,y) |
417 | # endif /* !defined(sparc) && !defined(__hppa) */ |
418 | |
419 | |
420 | /* ------------------------------------------------------------------------ */ |
421 | /* Function: ipf_sync_write */ |
422 | /* Returns: int - 0 == success, else error value. */ |
423 | /* Parameters: uio(I) - pointer to information about data to write */ |
424 | /* */ |
425 | /* Moves data from user space into the kernel and uses it for updating data */ |
426 | /* structures in the state/NAT tables. */ |
427 | /* ------------------------------------------------------------------------ */ |
428 | int |
429 | ipf_sync_write(ipf_main_softc_t *softc, struct uio *uio) |
430 | { |
431 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
432 | synchdr_t sh; |
433 | |
434 | /* |
435 | * THIS MUST BE SUFFICIENT LARGE TO STORE |
436 | * ANY POSSIBLE DATA TYPE |
437 | */ |
438 | char data[2048]; |
439 | |
440 | int err = 0; |
441 | |
442 | # if BSD_GE_YEAR(199306) || defined(__FreeBSD__) || defined(__osf__) |
443 | uio->uio_rw = UIO_WRITE; |
444 | # endif |
445 | |
446 | /* Try to get bytes */ |
447 | while (uio->uio_resid > 0) { |
448 | |
449 | if (uio->uio_resid >= sizeof(sh)) { |
450 | |
451 | err = UIOMOVE((void *)&sh, sizeof(sh), UIO_WRITE, uio); |
452 | |
453 | if (err) { |
454 | if (softs->ipf_sync_debug > 2) |
455 | printf("uiomove(header) failed: %d\n" , |
456 | err); |
457 | return err; |
458 | } |
459 | |
460 | /* convert to host order */ |
461 | sh.sm_magic = ntohl(sh.sm_magic); |
462 | sh.sm_len = ntohl(sh.sm_len); |
463 | sh.sm_num = ntohl(sh.sm_num); |
464 | |
465 | if (softs->ipf_sync_debug > 8) |
466 | printf("[%d] Read v:%d p:%d cmd:%d table:%d rev:%d len:%d magic:%x\n" , |
467 | sh.sm_num, sh.sm_v, sh.sm_p, sh.sm_cmd, |
468 | sh.sm_table, sh.sm_rev, sh.sm_len, |
469 | sh.sm_magic); |
470 | |
471 | if (sh.sm_magic != SYNHDRMAGIC) { |
472 | if (softs->ipf_sync_debug > 2) |
473 | printf("uiomove(header) invalid %s\n" , |
474 | "magic" ); |
475 | IPFERROR(110001); |
476 | return EINVAL; |
477 | } |
478 | |
479 | if (sh.sm_v != 4 && sh.sm_v != 6) { |
480 | if (softs->ipf_sync_debug > 2) |
481 | printf("uiomove(header) invalid %s\n" , |
482 | "protocol" ); |
483 | IPFERROR(110002); |
484 | return EINVAL; |
485 | } |
486 | |
487 | if (sh.sm_cmd > SMC_MAXCMD) { |
488 | if (softs->ipf_sync_debug > 2) |
489 | printf("uiomove(header) invalid %s\n" , |
490 | "command" ); |
491 | IPFERROR(110003); |
492 | return EINVAL; |
493 | } |
494 | |
495 | |
496 | if (sh.sm_table > SMC_MAXTBL) { |
497 | if (softs->ipf_sync_debug > 2) |
498 | printf("uiomove(header) invalid %s\n" , |
499 | "table" ); |
500 | IPFERROR(110004); |
501 | return EINVAL; |
502 | } |
503 | |
504 | } else { |
505 | /* unsufficient data, wait until next call */ |
506 | if (softs->ipf_sync_debug > 2) |
507 | printf("uiomove(header) insufficient data" ); |
508 | IPFERROR(110005); |
509 | return EAGAIN; |
510 | } |
511 | |
512 | |
513 | /* |
514 | * We have a header, so try to read the amount of data |
515 | * needed for the request |
516 | */ |
517 | |
518 | /* not supported */ |
519 | if (sh.sm_len == 0) { |
520 | if (softs->ipf_sync_debug > 2) |
521 | printf("uiomove(data zero length %s\n" , |
522 | "not supported" ); |
523 | IPFERROR(110006); |
524 | return EINVAL; |
525 | } |
526 | |
527 | if (uio->uio_resid >= sh.sm_len) { |
528 | |
529 | err = UIOMOVE((void *)data, sh.sm_len, UIO_WRITE, uio); |
530 | |
531 | if (err) { |
532 | if (softs->ipf_sync_debug > 2) |
533 | printf("uiomove(data) failed: %d\n" , |
534 | err); |
535 | return err; |
536 | } |
537 | |
538 | if (softs->ipf_sync_debug > 7) |
539 | printf("uiomove(data) %d bytes read\n" , |
540 | sh.sm_len); |
541 | |
542 | if (sh.sm_table == SMC_STATE) |
543 | err = ipf_sync_state(softc, &sh, data); |
544 | else if (sh.sm_table == SMC_NAT) |
545 | err = ipf_sync_nat(softc, &sh, data); |
546 | if (softs->ipf_sync_debug > 7) |
547 | printf("[%d] Finished with error %d\n" , |
548 | sh.sm_num, err); |
549 | |
550 | } else { |
551 | /* insufficient data, wait until next call */ |
552 | if (softs->ipf_sync_debug > 2) |
553 | printf("uiomove(data) %s %d bytes, got %d\n" , |
554 | "insufficient data, need" , |
555 | sh.sm_len, (int)uio->uio_resid); |
556 | IPFERROR(110007); |
557 | return EAGAIN; |
558 | } |
559 | } |
560 | |
561 | /* no more data */ |
562 | return 0; |
563 | } |
564 | |
565 | |
566 | /* ------------------------------------------------------------------------ */ |
567 | /* Function: ipf_sync_read */ |
568 | /* Returns: int - 0 == success, else error value. */ |
569 | /* Parameters: uio(O) - pointer to information about where to store data */ |
570 | /* */ |
571 | /* This function is called when a user program wants to read some data */ |
572 | /* for pending state/NAT updates. If no data is available, the caller is */ |
573 | /* put to sleep, pending a wakeup from the "lower half" of this code. */ |
574 | /* ------------------------------------------------------------------------ */ |
575 | int |
576 | ipf_sync_read(ipf_main_softc_t *softc, struct uio *uio) |
577 | { |
578 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
579 | syncupdent_t *su; |
580 | synclogent_t *sl; |
581 | int err = 0; |
582 | |
583 | if ((uio->uio_resid & 3) || (uio->uio_resid < 8)) { |
584 | IPFERROR(110008); |
585 | return EINVAL; |
586 | } |
587 | |
588 | # if BSD_GE_YEAR(199306) || defined(__FreeBSD__) || defined(__osf__) |
589 | uio->uio_rw = UIO_READ; |
590 | # endif |
591 | |
592 | MUTEX_ENTER(&softs->ipsl_mutex); |
593 | while ((softs->sl_tail == softs->sl_idx) && |
594 | (softs->su_tail == softs->su_idx)) { |
595 | # if defined(_KERNEL) |
596 | # if SOLARIS |
597 | if (!cv_wait_sig(&softs->ipslwait, &softs->ipsl_mutex.ipf_lk)) { |
598 | MUTEX_EXIT(&softs->ipsl_mutex); |
599 | IPFERROR(110009); |
600 | return EINTR; |
601 | } |
602 | # else |
603 | # ifdef __hpux |
604 | { |
605 | lock_t *l; |
606 | |
607 | l = get_sleep_lock(&softs->sl_tail); |
608 | err = sleep(&softs->sl_tail, PZERO+1); |
609 | if (err) { |
610 | MUTEX_EXIT(&softs->ipsl_mutex); |
611 | IPFERROR(110010); |
612 | return EINTR; |
613 | } |
614 | spinunlock(l); |
615 | } |
616 | # else /* __hpux */ |
617 | # ifdef __osf__ |
618 | err = mpsleep(&softs->sl_tail, PSUSP|PCATCH, "ipl sleep" , 0, |
619 | &softs->ipsl_mutex, MS_LOCK_SIMPLE); |
620 | if (err) { |
621 | IPFERROR(110011); |
622 | return EINTR; |
623 | } |
624 | # else |
625 | MUTEX_EXIT(&softs->ipsl_mutex); |
626 | err = SLEEP(&softs->sl_tail, "ipl sleep" ); |
627 | if (err) { |
628 | IPFERROR(110012); |
629 | return EINTR; |
630 | } |
631 | MUTEX_ENTER(&softs->ipsl_mutex); |
632 | # endif /* __osf__ */ |
633 | # endif /* __hpux */ |
634 | # endif /* SOLARIS */ |
635 | # endif /* _KERNEL */ |
636 | } |
637 | |
638 | while ((softs->sl_tail < softs->sl_idx) && |
639 | (uio->uio_resid > sizeof(*sl))) { |
640 | sl = softs->synclog + softs->sl_tail++; |
641 | MUTEX_EXIT(&softs->ipsl_mutex); |
642 | err = UIOMOVE(sl, sizeof(*sl), UIO_READ, uio); |
643 | if (err != 0) |
644 | goto goterror; |
645 | MUTEX_ENTER(&softs->ipsl_mutex); |
646 | } |
647 | |
648 | while ((softs->su_tail < softs->su_idx) && |
649 | (uio->uio_resid > sizeof(*su))) { |
650 | su = softs->syncupd + softs->su_tail; |
651 | softs->su_tail++; |
652 | MUTEX_EXIT(&softs->ipsl_mutex); |
653 | err = UIOMOVE(su, sizeof(*su), UIO_READ, uio); |
654 | if (err != 0) |
655 | goto goterror; |
656 | MUTEX_ENTER(&softs->ipsl_mutex); |
657 | if (su->sup_hdr.sm_sl != NULL) |
658 | su->sup_hdr.sm_sl->sl_idx = -1; |
659 | } |
660 | if (softs->sl_tail == softs->sl_idx) |
661 | softs->sl_tail = softs->sl_idx = 0; |
662 | if (softs->su_tail == softs->su_idx) |
663 | softs->su_tail = softs->su_idx = 0; |
664 | MUTEX_EXIT(&softs->ipsl_mutex); |
665 | goterror: |
666 | return err; |
667 | } |
668 | |
669 | |
670 | /* ------------------------------------------------------------------------ */ |
671 | /* Function: ipf_sync_state */ |
672 | /* Returns: int - 0 == success, else error value. */ |
673 | /* Parameters: sp(I) - pointer to sync packet data header */ |
674 | /* uio(I) - pointer to user data for further information */ |
675 | /* */ |
676 | /* Updates the state table according to information passed in the sync */ |
677 | /* header. As required, more data is fetched from the uio structure but */ |
678 | /* varies depending on the contents of the sync header. This function can */ |
679 | /* create a new state entry or update one. Deletion is left to the state */ |
680 | /* structures being timed out correctly. */ |
681 | /* ------------------------------------------------------------------------ */ |
682 | static int |
683 | ipf_sync_state(ipf_main_softc_t *softc, synchdr_t *sp, void *data) |
684 | { |
685 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
686 | synctcp_update_t su; |
687 | ipstate_t *is, sn; |
688 | synclist_t *sl; |
689 | frentry_t *fr; |
690 | u_int hv; |
691 | int err = 0; |
692 | |
693 | hv = sp->sm_num & (softs->ipf_sync_state_tab_sz - 1); |
694 | |
695 | switch (sp->sm_cmd) |
696 | { |
697 | case SMC_CREATE : |
698 | |
699 | bcopy(data, &sn, sizeof(sn)); |
700 | KMALLOC(is, ipstate_t *); |
701 | if (is == NULL) { |
702 | IPFERROR(110013); |
703 | err = ENOMEM; |
704 | break; |
705 | } |
706 | |
707 | KMALLOC(sl, synclist_t *); |
708 | if (sl == NULL) { |
709 | IPFERROR(110014); |
710 | err = ENOMEM; |
711 | KFREE(is); |
712 | break; |
713 | } |
714 | |
715 | bzero((char *)is, offsetof(ipstate_t, is_die)); |
716 | bcopy((char *)&sn.is_die, (char *)&is->is_die, |
717 | sizeof(*is) - offsetof(ipstate_t, is_die)); |
718 | ipf_sync_storder(0, is); |
719 | |
720 | /* |
721 | * We need to find the same rule on the slave as was used on |
722 | * the master to create this state entry. |
723 | */ |
724 | READ_ENTER(&softc->ipf_mutex); |
725 | fr = ipf_getrulen(softc, IPL_LOGIPF, sn.is_group, sn.is_rulen); |
726 | if (fr != NULL) { |
727 | MUTEX_ENTER(&fr->fr_lock); |
728 | fr->fr_ref++; |
729 | fr->fr_statecnt++; |
730 | MUTEX_EXIT(&fr->fr_lock); |
731 | } |
732 | RWLOCK_EXIT(&softc->ipf_mutex); |
733 | |
734 | if (softs->ipf_sync_debug > 4) |
735 | printf("[%d] Filter rules = %p\n" , sp->sm_num, fr); |
736 | |
737 | is->is_rule = fr; |
738 | is->is_sync = sl; |
739 | |
740 | sl->sl_idx = -1; |
741 | sl->sl_ips = is; |
742 | bcopy(sp, &sl->sl_hdr, sizeof(struct synchdr)); |
743 | |
744 | WRITE_ENTER(&softs->ipf_syncstate); |
745 | WRITE_ENTER(&softc->ipf_state); |
746 | |
747 | sl->sl_pnext = softs->syncstatetab + hv; |
748 | sl->sl_next = softs->syncstatetab[hv]; |
749 | if (softs->syncstatetab[hv] != NULL) |
750 | softs->syncstatetab[hv]->sl_pnext = &sl->sl_next; |
751 | softs->syncstatetab[hv] = sl; |
752 | MUTEX_DOWNGRADE(&softs->ipf_syncstate); |
753 | ipf_state_insert(softc, is, sp->sm_rev); |
754 | /* |
755 | * Do not initialise the interface pointers for the state |
756 | * entry as the full complement of interface names may not |
757 | * be present. |
758 | * |
759 | * Put this state entry on its timeout queue. |
760 | */ |
761 | /*fr_setstatequeue(is, sp->sm_rev);*/ |
762 | break; |
763 | |
764 | case SMC_UPDATE : |
765 | bcopy(data, &su, sizeof(su)); |
766 | |
767 | if (softs->ipf_sync_debug > 4) |
768 | printf("[%d] Update age %lu state %d/%d \n" , |
769 | sp->sm_num, su.stu_age, su.stu_state[0], |
770 | su.stu_state[1]); |
771 | |
772 | READ_ENTER(&softs->ipf_syncstate); |
773 | for (sl = softs->syncstatetab[hv]; (sl != NULL); |
774 | sl = sl->sl_next) |
775 | if (sl->sl_hdr.sm_num == sp->sm_num) |
776 | break; |
777 | if (sl == NULL) { |
778 | if (softs->ipf_sync_debug > 1) |
779 | printf("[%d] State not found - can't update\n" , |
780 | sp->sm_num); |
781 | RWLOCK_EXIT(&softs->ipf_syncstate); |
782 | IPFERROR(110015); |
783 | err = ENOENT; |
784 | break; |
785 | } |
786 | |
787 | READ_ENTER(&softc->ipf_state); |
788 | |
789 | if (softs->ipf_sync_debug > 6) |
790 | printf("[%d] Data from state v:%d p:%d cmd:%d table:%d rev:%d\n" , |
791 | sp->sm_num, sl->sl_hdr.sm_v, sl->sl_hdr.sm_p, |
792 | sl->sl_hdr.sm_cmd, sl->sl_hdr.sm_table, |
793 | sl->sl_hdr.sm_rev); |
794 | |
795 | is = sl->sl_ips; |
796 | |
797 | MUTEX_ENTER(&is->is_lock); |
798 | switch (sp->sm_p) |
799 | { |
800 | case IPPROTO_TCP : |
801 | /* XXX FV --- shouldn't we do ntohl/htonl???? XXX */ |
802 | is->is_send = su.stu_data[0].td_end; |
803 | is->is_maxsend = su.stu_data[0].td_maxend; |
804 | is->is_maxswin = su.stu_data[0].td_maxwin; |
805 | is->is_state[0] = su.stu_state[0]; |
806 | is->is_dend = su.stu_data[1].td_end; |
807 | is->is_maxdend = su.stu_data[1].td_maxend; |
808 | is->is_maxdwin = su.stu_data[1].td_maxwin; |
809 | is->is_state[1] = su.stu_state[1]; |
810 | break; |
811 | default : |
812 | break; |
813 | } |
814 | |
815 | if (softs->ipf_sync_debug > 6) |
816 | printf("[%d] Setting timers for state\n" , sp->sm_num); |
817 | |
818 | ipf_state_setqueue(softc, is, sp->sm_rev); |
819 | |
820 | MUTEX_EXIT(&is->is_lock); |
821 | break; |
822 | |
823 | default : |
824 | IPFERROR(110016); |
825 | err = EINVAL; |
826 | break; |
827 | } |
828 | |
829 | if (err == 0) { |
830 | RWLOCK_EXIT(&softc->ipf_state); |
831 | RWLOCK_EXIT(&softs->ipf_syncstate); |
832 | } |
833 | |
834 | if (softs->ipf_sync_debug > 6) |
835 | printf("[%d] Update completed with error %d\n" , |
836 | sp->sm_num, err); |
837 | |
838 | return err; |
839 | } |
840 | |
841 | |
842 | /* ------------------------------------------------------------------------ */ |
843 | /* Function: ipf_sync_del */ |
844 | /* Returns: Nil */ |
845 | /* Parameters: sl(I) - pointer to synclist object to delete */ |
846 | /* */ |
847 | /* Deletes an object from the synclist. */ |
848 | /* ------------------------------------------------------------------------ */ |
849 | static void |
850 | ipf_sync_del(ipf_sync_softc_t *softs, synclist_t *sl) |
851 | { |
852 | *sl->sl_pnext = sl->sl_next; |
853 | if (sl->sl_next != NULL) |
854 | sl->sl_next->sl_pnext = sl->sl_pnext; |
855 | if (sl->sl_idx != -1) |
856 | softs->syncupd[sl->sl_idx].sup_hdr.sm_sl = NULL; |
857 | } |
858 | |
859 | |
860 | /* ------------------------------------------------------------------------ */ |
861 | /* Function: ipf_sync_del_state */ |
862 | /* Returns: Nil */ |
863 | /* Parameters: sl(I) - pointer to synclist object to delete */ |
864 | /* */ |
865 | /* Deletes an object from the synclist state table and free's its memory. */ |
866 | /* ------------------------------------------------------------------------ */ |
867 | void |
868 | ipf_sync_del_state(void *arg, synclist_t *sl) |
869 | { |
870 | ipf_sync_softc_t *softs = arg; |
871 | |
872 | WRITE_ENTER(&softs->ipf_syncstate); |
873 | ipf_sync_del(softs, sl); |
874 | RWLOCK_EXIT(&softs->ipf_syncstate); |
875 | KFREE(sl); |
876 | } |
877 | |
878 | |
879 | /* ------------------------------------------------------------------------ */ |
880 | /* Function: ipf_sync_del_nat */ |
881 | /* Returns: Nil */ |
882 | /* Parameters: sl(I) - pointer to synclist object to delete */ |
883 | /* */ |
884 | /* Deletes an object from the synclist nat table and free's its memory. */ |
885 | /* ------------------------------------------------------------------------ */ |
886 | void |
887 | ipf_sync_del_nat(void *arg, synclist_t *sl) |
888 | { |
889 | ipf_sync_softc_t *softs = arg; |
890 | |
891 | WRITE_ENTER(&softs->ipf_syncnat); |
892 | ipf_sync_del(softs, sl); |
893 | RWLOCK_EXIT(&softs->ipf_syncnat); |
894 | KFREE(sl); |
895 | } |
896 | |
897 | |
898 | /* ------------------------------------------------------------------------ */ |
899 | /* Function: ipf_sync_nat */ |
900 | /* Returns: int - 0 == success, else error value. */ |
901 | /* Parameters: sp(I) - pointer to sync packet data header */ |
902 | /* uio(I) - pointer to user data for further information */ |
903 | /* */ |
904 | /* Updates the NAT table according to information passed in the sync */ |
905 | /* header. As required, more data is fetched from the uio structure but */ |
906 | /* varies depending on the contents of the sync header. This function can */ |
907 | /* create a new NAT entry or update one. Deletion is left to the NAT */ |
908 | /* structures being timed out correctly. */ |
909 | /* ------------------------------------------------------------------------ */ |
910 | static int |
911 | ipf_sync_nat(ipf_main_softc_t *softc, synchdr_t *sp, void *data) |
912 | { |
913 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
914 | syncupdent_t su; |
915 | nat_t *n, *nat; |
916 | synclist_t *sl; |
917 | u_int hv = 0; |
918 | int err = 0; |
919 | |
920 | READ_ENTER(&softs->ipf_syncnat); |
921 | |
922 | switch (sp->sm_cmd) |
923 | { |
924 | case SMC_CREATE : |
925 | KMALLOC(n, nat_t *); |
926 | if (n == NULL) { |
927 | IPFERROR(110017); |
928 | err = ENOMEM; |
929 | break; |
930 | } |
931 | |
932 | KMALLOC(sl, synclist_t *); |
933 | if (sl == NULL) { |
934 | IPFERROR(110018); |
935 | err = ENOMEM; |
936 | KFREE(n); |
937 | break; |
938 | } |
939 | |
940 | nat = (nat_t *)data; |
941 | bzero((char *)n, offsetof(nat_t, nat_age)); |
942 | bcopy((char *)&nat->nat_age, (char *)&n->nat_age, |
943 | sizeof(*n) - offsetof(nat_t, nat_age)); |
944 | ipf_sync_natorder(0, n); |
945 | n->nat_sync = sl; |
946 | n->nat_rev = sl->sl_rev; |
947 | |
948 | sl->sl_idx = -1; |
949 | sl->sl_ipn = n; |
950 | sl->sl_num = ntohl(sp->sm_num); |
951 | |
952 | WRITE_ENTER(&softc->ipf_nat); |
953 | sl->sl_pnext = softs->syncnattab + hv; |
954 | sl->sl_next = softs->syncnattab[hv]; |
955 | if (softs->syncnattab[hv] != NULL) |
956 | softs->syncnattab[hv]->sl_pnext = &sl->sl_next; |
957 | softs->syncnattab[hv] = sl; |
958 | (void) ipf_nat_insert(softc, softc->ipf_nat_soft, n); |
959 | RWLOCK_EXIT(&softc->ipf_nat); |
960 | break; |
961 | |
962 | case SMC_UPDATE : |
963 | bcopy(data, &su, sizeof(su)); |
964 | |
965 | for (sl = softs->syncnattab[hv]; (sl != NULL); |
966 | sl = sl->sl_next) |
967 | if (sl->sl_hdr.sm_num == sp->sm_num) |
968 | break; |
969 | if (sl == NULL) { |
970 | IPFERROR(110019); |
971 | err = ENOENT; |
972 | break; |
973 | } |
974 | |
975 | READ_ENTER(&softc->ipf_nat); |
976 | |
977 | nat = sl->sl_ipn; |
978 | nat->nat_rev = sl->sl_rev; |
979 | |
980 | MUTEX_ENTER(&nat->nat_lock); |
981 | ipf_nat_setqueue(softc, softc->ipf_nat_soft, nat); |
982 | MUTEX_EXIT(&nat->nat_lock); |
983 | |
984 | RWLOCK_EXIT(&softc->ipf_nat); |
985 | |
986 | break; |
987 | |
988 | default : |
989 | IPFERROR(110020); |
990 | err = EINVAL; |
991 | break; |
992 | } |
993 | |
994 | RWLOCK_EXIT(&softs->ipf_syncnat); |
995 | return err; |
996 | } |
997 | |
998 | |
999 | /* ------------------------------------------------------------------------ */ |
1000 | /* Function: ipf_sync_new */ |
1001 | /* Returns: synclist_t* - NULL == failure, else pointer to new synclist */ |
1002 | /* data structure. */ |
1003 | /* Parameters: tab(I) - type of synclist_t to create */ |
1004 | /* fin(I) - pointer to packet information */ |
1005 | /* ptr(I) - pointer to owning object */ |
1006 | /* */ |
1007 | /* Creates a new sync table entry and notifies any sleepers that it's there */ |
1008 | /* waiting to be processed. */ |
1009 | /* ------------------------------------------------------------------------ */ |
1010 | synclist_t * |
1011 | ipf_sync_new(ipf_main_softc_t *softc, int tab, fr_info_t *fin, void *ptr) |
1012 | { |
1013 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
1014 | synclist_t *sl, *ss; |
1015 | synclogent_t *sle; |
1016 | u_int hv, sz; |
1017 | |
1018 | if (softs->sl_idx == softs->ipf_sync_log_sz) |
1019 | return NULL; |
1020 | KMALLOC(sl, synclist_t *); |
1021 | if (sl == NULL) |
1022 | return NULL; |
1023 | |
1024 | MUTEX_ENTER(&softs->ipf_syncadd); |
1025 | /* |
1026 | * Get a unique number for this synclist_t. The number is only meant |
1027 | * to be unique for the lifetime of the structure and may be reused |
1028 | * later. |
1029 | */ |
1030 | softs->ipf_sync_num++; |
1031 | if (softs->ipf_sync_num == 0) { |
1032 | softs->ipf_sync_num = 1; |
1033 | softs->ipf_sync_wrap++; |
1034 | } |
1035 | |
1036 | /* |
1037 | * Use the synch number of the object as the hash key. Should end up |
1038 | * with relatively even distribution over time. |
1039 | * XXX - an attacker could lunch an DoS attack, of sorts, if they are |
1040 | * the only one causing new table entries by only keeping open every |
1041 | * nth connection they make, where n is a value in the interval |
1042 | * [0, SYNC_STATETABSZ-1]. |
1043 | */ |
1044 | switch (tab) |
1045 | { |
1046 | case SMC_STATE : |
1047 | hv = softs->ipf_sync_num & (softs->ipf_sync_state_tab_sz - 1); |
1048 | while (softs->ipf_sync_wrap != 0) { |
1049 | for (ss = softs->syncstatetab[hv]; ss; ss = ss->sl_next) |
1050 | if (ss->sl_hdr.sm_num == softs->ipf_sync_num) |
1051 | break; |
1052 | if (ss == NULL) |
1053 | break; |
1054 | softs->ipf_sync_num++; |
1055 | hv = softs->ipf_sync_num & |
1056 | (softs->ipf_sync_state_tab_sz - 1); |
1057 | } |
1058 | sl->sl_pnext = softs->syncstatetab + hv; |
1059 | sl->sl_next = softs->syncstatetab[hv]; |
1060 | softs->syncstatetab[hv] = sl; |
1061 | break; |
1062 | |
1063 | case SMC_NAT : |
1064 | hv = softs->ipf_sync_num & (softs->ipf_sync_nat_tab_sz - 1); |
1065 | while (softs->ipf_sync_wrap != 0) { |
1066 | for (ss = softs->syncnattab[hv]; ss; ss = ss->sl_next) |
1067 | if (ss->sl_hdr.sm_num == softs->ipf_sync_num) |
1068 | break; |
1069 | if (ss == NULL) |
1070 | break; |
1071 | softs->ipf_sync_num++; |
1072 | hv = softs->ipf_sync_num & |
1073 | (softs->ipf_sync_nat_tab_sz - 1); |
1074 | } |
1075 | sl->sl_pnext = softs->syncnattab + hv; |
1076 | sl->sl_next = softs->syncnattab[hv]; |
1077 | softs->syncnattab[hv] = sl; |
1078 | break; |
1079 | |
1080 | default : |
1081 | break; |
1082 | } |
1083 | |
1084 | sl->sl_num = softs->ipf_sync_num; |
1085 | MUTEX_EXIT(&softs->ipf_syncadd); |
1086 | |
1087 | sl->sl_magic = htonl(SYNHDRMAGIC); |
1088 | sl->sl_v = fin->fin_v; |
1089 | sl->sl_p = fin->fin_p; |
1090 | sl->sl_cmd = SMC_CREATE; |
1091 | sl->sl_idx = -1; |
1092 | sl->sl_table = tab; |
1093 | sl->sl_rev = fin->fin_rev; |
1094 | if (tab == SMC_STATE) { |
1095 | sl->sl_ips = ptr; |
1096 | sz = sizeof(*sl->sl_ips); |
1097 | } else if (tab == SMC_NAT) { |
1098 | sl->sl_ipn = ptr; |
1099 | sz = sizeof(*sl->sl_ipn); |
1100 | } else { |
1101 | ptr = NULL; |
1102 | sz = 0; |
1103 | } |
1104 | sl->sl_len = sz; |
1105 | |
1106 | /* |
1107 | * Create the log entry to be read by a user daemon. When it has been |
1108 | * finished and put on the queue, send a signal to wakeup any waiters. |
1109 | */ |
1110 | MUTEX_ENTER(&softs->ipf_syncadd); |
1111 | sle = softs->synclog + softs->sl_idx++; |
1112 | bcopy((char *)&sl->sl_hdr, (char *)&sle->sle_hdr, |
1113 | sizeof(sle->sle_hdr)); |
1114 | sle->sle_hdr.sm_num = htonl(sle->sle_hdr.sm_num); |
1115 | sle->sle_hdr.sm_len = htonl(sle->sle_hdr.sm_len); |
1116 | if (ptr != NULL) { |
1117 | bcopy((char *)ptr, (char *)&sle->sle_un, sz); |
1118 | if (tab == SMC_STATE) { |
1119 | ipf_sync_storder(1, &sle->sle_un.sleu_ips); |
1120 | } else if (tab == SMC_NAT) { |
1121 | ipf_sync_natorder(1, &sle->sle_un.sleu_ipn); |
1122 | } |
1123 | } |
1124 | MUTEX_EXIT(&softs->ipf_syncadd); |
1125 | |
1126 | ipf_sync_wakeup(softc); |
1127 | return sl; |
1128 | } |
1129 | |
1130 | |
1131 | /* ------------------------------------------------------------------------ */ |
1132 | /* Function: ipf_sync_update */ |
1133 | /* Returns: Nil */ |
1134 | /* Parameters: tab(I) - type of synclist_t to create */ |
1135 | /* fin(I) - pointer to packet information */ |
1136 | /* sl(I) - pointer to synchronisation object */ |
1137 | /* */ |
1138 | /* For outbound packets, only, create an sync update record for the user */ |
1139 | /* process to read. */ |
1140 | /* ------------------------------------------------------------------------ */ |
1141 | void |
1142 | ipf_sync_update(ipf_main_softc_t *softc, int tab, fr_info_t *fin, |
1143 | synclist_t *sl) |
1144 | { |
1145 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
1146 | synctcp_update_t *st; |
1147 | syncupdent_t *slu; |
1148 | ipstate_t *ips; |
1149 | nat_t *nat; |
1150 | ipfrwlock_t *lock; |
1151 | |
1152 | if (fin->fin_out == 0 || sl == NULL) |
1153 | return; |
1154 | |
1155 | if (tab == SMC_STATE) { |
1156 | lock = &softs->ipf_syncstate; |
1157 | } else { |
1158 | lock = &softs->ipf_syncnat; |
1159 | } |
1160 | |
1161 | READ_ENTER(lock); |
1162 | if (sl->sl_idx == -1) { |
1163 | MUTEX_ENTER(&softs->ipf_syncadd); |
1164 | slu = softs->syncupd + softs->su_idx; |
1165 | sl->sl_idx = softs->su_idx++; |
1166 | MUTEX_EXIT(&softs->ipf_syncadd); |
1167 | |
1168 | bcopy((char *)&sl->sl_hdr, (char *)&slu->sup_hdr, |
1169 | sizeof(slu->sup_hdr)); |
1170 | slu->sup_hdr.sm_magic = htonl(SYNHDRMAGIC); |
1171 | slu->sup_hdr.sm_sl = sl; |
1172 | slu->sup_hdr.sm_cmd = SMC_UPDATE; |
1173 | slu->sup_hdr.sm_table = tab; |
1174 | slu->sup_hdr.sm_num = htonl(sl->sl_num); |
1175 | slu->sup_hdr.sm_len = htonl(sizeof(struct synctcp_update)); |
1176 | slu->sup_hdr.sm_rev = fin->fin_rev; |
1177 | # if 0 |
1178 | if (fin->fin_p == IPPROTO_TCP) { |
1179 | st->stu_len[0] = 0; |
1180 | st->stu_len[1] = 0; |
1181 | } |
1182 | # endif |
1183 | } else |
1184 | slu = softs->syncupd + sl->sl_idx; |
1185 | |
1186 | /* |
1187 | * Only TCP has complex timeouts, others just use default timeouts. |
1188 | * For TCP, we only need to track the connection state and window. |
1189 | */ |
1190 | if (fin->fin_p == IPPROTO_TCP) { |
1191 | st = &slu->sup_tcp; |
1192 | if (tab == SMC_STATE) { |
1193 | ips = sl->sl_ips; |
1194 | st->stu_age = htonl(ips->is_die); |
1195 | st->stu_data[0].td_end = ips->is_send; |
1196 | st->stu_data[0].td_maxend = ips->is_maxsend; |
1197 | st->stu_data[0].td_maxwin = ips->is_maxswin; |
1198 | st->stu_state[0] = ips->is_state[0]; |
1199 | st->stu_data[1].td_end = ips->is_dend; |
1200 | st->stu_data[1].td_maxend = ips->is_maxdend; |
1201 | st->stu_data[1].td_maxwin = ips->is_maxdwin; |
1202 | st->stu_state[1] = ips->is_state[1]; |
1203 | } else if (tab == SMC_NAT) { |
1204 | nat = sl->sl_ipn; |
1205 | st->stu_age = htonl(nat->nat_age); |
1206 | } |
1207 | } |
1208 | RWLOCK_EXIT(lock); |
1209 | |
1210 | ipf_sync_wakeup(softc); |
1211 | } |
1212 | |
1213 | |
1214 | /* ------------------------------------------------------------------------ */ |
1215 | /* Function: ipf_sync_flush_table */ |
1216 | /* Returns: int - number of entries freed by flushing table */ |
1217 | /* Parameters: tabsize(I) - size of the array pointed to by table */ |
1218 | /* table(I) - pointer to sync table to empty */ |
1219 | /* */ |
1220 | /* Walk through a table of sync entries and free each one. It is assumed */ |
1221 | /* that some lock is held so that nobody else tries to access the table */ |
1222 | /* during this cleanup. */ |
1223 | /* ------------------------------------------------------------------------ */ |
1224 | static int |
1225 | ipf_sync_flush_table(ipf_sync_softc_t *softs, int tabsize, synclist_t **table) |
1226 | { |
1227 | synclist_t *sl; |
1228 | int i, items; |
1229 | |
1230 | items = 0; |
1231 | |
1232 | for (i = 0; i < tabsize; i++) { |
1233 | while ((sl = table[i]) != NULL) { |
1234 | switch (sl->sl_table) { |
1235 | case SMC_STATE : |
1236 | if (sl->sl_ips != NULL) |
1237 | sl->sl_ips->is_sync = NULL; |
1238 | break; |
1239 | case SMC_NAT : |
1240 | if (sl->sl_ipn != NULL) |
1241 | sl->sl_ipn->nat_sync = NULL; |
1242 | break; |
1243 | } |
1244 | if (sl->sl_next != NULL) |
1245 | sl->sl_next->sl_pnext = sl->sl_pnext; |
1246 | table[i] = sl->sl_next; |
1247 | if (sl->sl_idx != -1) |
1248 | softs->syncupd[sl->sl_idx].sup_hdr.sm_sl = NULL; |
1249 | KFREE(sl); |
1250 | items++; |
1251 | } |
1252 | } |
1253 | |
1254 | return items; |
1255 | } |
1256 | |
1257 | |
1258 | /* ------------------------------------------------------------------------ */ |
1259 | /* Function: ipf_sync_ioctl */ |
1260 | /* Returns: int - 0 == success, != 0 == failure */ |
1261 | /* Parameters: data(I) - pointer to ioctl data */ |
1262 | /* cmd(I) - ioctl command integer */ |
1263 | /* mode(I) - file mode bits used with open */ |
1264 | /* */ |
1265 | /* This function currently does not handle any ioctls and so just returns */ |
1266 | /* EINVAL on all occasions. */ |
1267 | /* ------------------------------------------------------------------------ */ |
1268 | int |
1269 | ipf_sync_ioctl(ipf_main_softc_t *softc, void *data, ioctlcmd_t cmd, int mode, |
1270 | int uid, void *ctx) |
1271 | { |
1272 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
1273 | int error, i; |
1274 | SPL_INT(s); |
1275 | |
1276 | switch (cmd) |
1277 | { |
1278 | case SIOCIPFFL: |
1279 | error = BCOPYIN(data, &i, sizeof(i)); |
1280 | if (error != 0) { |
1281 | IPFERROR(110023); |
1282 | error = EFAULT; |
1283 | break; |
1284 | } |
1285 | |
1286 | switch (i) |
1287 | { |
1288 | case SMC_RLOG : |
1289 | SPL_NET(s); |
1290 | MUTEX_ENTER(&softs->ipsl_mutex); |
1291 | i = (softs->sl_tail - softs->sl_idx) + |
1292 | (softs->su_tail - softs->su_idx); |
1293 | softs->sl_idx = 0; |
1294 | softs->su_idx = 0; |
1295 | softs->sl_tail = 0; |
1296 | softs->su_tail = 0; |
1297 | MUTEX_EXIT(&softs->ipsl_mutex); |
1298 | SPL_X(s); |
1299 | break; |
1300 | |
1301 | case SMC_NAT : |
1302 | SPL_NET(s); |
1303 | WRITE_ENTER(&softs->ipf_syncnat); |
1304 | i = ipf_sync_flush_table(softs, SYNC_NATTABSZ, |
1305 | softs->syncnattab); |
1306 | RWLOCK_EXIT(&softs->ipf_syncnat); |
1307 | SPL_X(s); |
1308 | break; |
1309 | |
1310 | case SMC_STATE : |
1311 | SPL_NET(s); |
1312 | WRITE_ENTER(&softs->ipf_syncstate); |
1313 | i = ipf_sync_flush_table(softs, SYNC_STATETABSZ, |
1314 | softs->syncstatetab); |
1315 | RWLOCK_EXIT(&softs->ipf_syncstate); |
1316 | SPL_X(s); |
1317 | break; |
1318 | } |
1319 | |
1320 | error = BCOPYOUT(&i, data, sizeof(i)); |
1321 | if (error != 0) { |
1322 | IPFERROR(110022); |
1323 | error = EFAULT; |
1324 | } |
1325 | break; |
1326 | |
1327 | default : |
1328 | IPFERROR(110021); |
1329 | error = EINVAL; |
1330 | break; |
1331 | } |
1332 | |
1333 | return error; |
1334 | } |
1335 | |
1336 | |
1337 | /* ------------------------------------------------------------------------ */ |
1338 | /* Function: ipf_sync_canread */ |
1339 | /* Returns: int - 0 == success, != 0 == failure */ |
1340 | /* Parameters: Nil */ |
1341 | /* */ |
1342 | /* This function provides input to the poll handler about whether or not */ |
1343 | /* there is data waiting to be read from the /dev/ipsync device. */ |
1344 | /* ------------------------------------------------------------------------ */ |
1345 | int |
1346 | ipf_sync_canread(void *arg) |
1347 | { |
1348 | ipf_sync_softc_t *softs = arg; |
1349 | return !((softs->sl_tail == softs->sl_idx) && |
1350 | (softs->su_tail == softs->su_idx)); |
1351 | } |
1352 | |
1353 | |
1354 | /* ------------------------------------------------------------------------ */ |
1355 | /* Function: ipf_sync_canwrite */ |
1356 | /* Returns: int - 1 == can always write */ |
1357 | /* Parameters: Nil */ |
1358 | /* */ |
1359 | /* This function lets the poll handler know that it is always ready willing */ |
1360 | /* to accept write events. */ |
1361 | /* XXX Maybe this should return false if the sync table is full? */ |
1362 | /* ------------------------------------------------------------------------ */ |
1363 | int |
1364 | ipf_sync_canwrite(void *arg) |
1365 | { |
1366 | return 1; |
1367 | } |
1368 | |
1369 | |
1370 | /* ------------------------------------------------------------------------ */ |
1371 | /* Function: ipf_sync_wakeup */ |
1372 | /* Parameters: Nil */ |
1373 | /* Returns: Nil */ |
1374 | /* */ |
1375 | /* This function implements the heuristics that decide how often to */ |
1376 | /* generate a poll wakeup for programs that are waiting for information */ |
1377 | /* about when they can do a read on /dev/ipsync. */ |
1378 | /* */ |
1379 | /* There are three different considerations here: */ |
1380 | /* - do not keep a program waiting too long: ipf_sync_wake_interval is the */ |
1381 | /* maximum number of ipf ticks to let pass by; */ |
1382 | /* - do not let the queue of ouststanding things to generate notifies for */ |
1383 | /* get too full (ipf_sync_queue_high_wm is the high water mark); */ |
1384 | /* - do not let too many events get collapsed in before deciding that the */ |
1385 | /* other host(s) need an update (ipf_sync_event_high_wm is the high water */ |
1386 | /* mark for this counter.) */ |
1387 | /* ------------------------------------------------------------------------ */ |
1388 | static void |
1389 | ipf_sync_wakeup(ipf_main_softc_t *softc) |
1390 | { |
1391 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
1392 | |
1393 | softs->ipf_sync_events++; |
1394 | if ((softc->ipf_ticks > |
1395 | softs->ipf_sync_lastwakeup + softs->ipf_sync_wake_interval) || |
1396 | (softs->ipf_sync_events > softs->ipf_sync_event_high_wm) || |
1397 | ((softs->sl_tail - softs->sl_idx) > |
1398 | softs->ipf_sync_queue_high_wm) || |
1399 | ((softs->su_tail - softs->su_idx) > |
1400 | softs->ipf_sync_queue_high_wm)) { |
1401 | |
1402 | ipf_sync_poll_wakeup(softc); |
1403 | } |
1404 | } |
1405 | |
1406 | |
1407 | /* ------------------------------------------------------------------------ */ |
1408 | /* Function: ipf_sync_poll_wakeup */ |
1409 | /* Parameters: Nil */ |
1410 | /* Returns: Nil */ |
1411 | /* */ |
1412 | /* Deliver a poll wakeup and reset counters for two of the three heuristics */ |
1413 | /* ------------------------------------------------------------------------ */ |
1414 | static void |
1415 | ipf_sync_poll_wakeup(ipf_main_softc_t *softc) |
1416 | { |
1417 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
1418 | |
1419 | softs->ipf_sync_events = 0; |
1420 | softs->ipf_sync_lastwakeup = softc->ipf_ticks; |
1421 | |
1422 | # ifdef _KERNEL |
1423 | # if SOLARIS |
1424 | MUTEX_ENTER(&softs->ipsl_mutex); |
1425 | cv_signal(&softs->ipslwait); |
1426 | MUTEX_EXIT(&softs->ipsl_mutex); |
1427 | pollwakeup(&softc->ipf_poll_head[IPL_LOGSYNC], POLLIN|POLLRDNORM); |
1428 | # else |
1429 | WAKEUP(&softs->sl_tail, 0); |
1430 | POLLWAKEUP(IPL_LOGSYNC); |
1431 | # endif |
1432 | # endif |
1433 | } |
1434 | |
1435 | |
1436 | /* ------------------------------------------------------------------------ */ |
1437 | /* Function: ipf_sync_expire */ |
1438 | /* Parameters: Nil */ |
1439 | /* Returns: Nil */ |
1440 | /* */ |
1441 | /* This is the function called even ipf_tick. It implements one of the */ |
1442 | /* three heuristics above *IF* there are events waiting. */ |
1443 | /* ------------------------------------------------------------------------ */ |
1444 | void |
1445 | ipf_sync_expire(ipf_main_softc_t *softc) |
1446 | { |
1447 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
1448 | |
1449 | if ((softs->ipf_sync_events > 0) && |
1450 | (softc->ipf_ticks > |
1451 | softs->ipf_sync_lastwakeup + softs->ipf_sync_wake_interval)) { |
1452 | ipf_sync_poll_wakeup(softc); |
1453 | } |
1454 | } |
1455 | |