1 /* $NetBSD: ip_sync.c,v 1.6 2018/05/03 07:13:48 maxv 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/ip_fil.h" 82 #include "netinet/ip_nat.h" 83 #include "netinet/ip_frag.h" 84 #include "netinet/ip_state.h" 85 #include "netinet/ip_proxy.h" 86 #include "netinet/ip_sync.h" 87 #ifdef USE_INET6 88 #include <netinet/icmp6.h> 89 #endif 90 #if (__FreeBSD_version >= 300000) 91 # include <sys/malloc.h> 92 # if defined(_KERNEL) && !defined(IPFILTER_LKM) 93 # include <sys/libkern.h> 94 # include <sys/systm.h> 95 # endif 96 #endif 97 /* END OF INCLUDES */ 98 99 #if !defined(lint) 100 #if defined(__NetBSD__) 101 #include <sys/cdefs.h> 102 __KERNEL_RCSID(0, "$NetBSD: ip_sync.c,v 1.6 2018/05/03 07:13:48 maxv Exp $"); 103 #else 104 static const char rcsid[] = "@(#)Id: ip_sync.c,v 1.1.1.2 2012/07/22 13:45:38 darrenr Exp"; 105 #endif 106 #endif 107 108 #define SYNC_STATETABSZ 256 109 #define SYNC_NATTABSZ 256 110 111 typedef struct ipf_sync_softc_s { 112 ipfmutex_t ipf_syncadd; 113 ipfmutex_t ipsl_mutex; 114 ipfrwlock_t ipf_syncstate; 115 ipfrwlock_t ipf_syncnat; 116 #if SOLARIS && defined(_KERNEL) 117 kcondvar_t ipslwait; 118 #endif 119 #if defined(linux) && defined(_KERNEL) 120 wait_queue_head_t sl_tail_linux; 121 #endif 122 synclist_t **syncstatetab; 123 synclist_t **syncnattab; 124 synclogent_t *synclog; 125 syncupdent_t *syncupd; 126 u_int ipf_sync_num; 127 u_int ipf_sync_wrap; 128 u_int sl_idx; /* next available sync log entry */ 129 u_int su_idx; /* next available sync update entry */ 130 u_int sl_tail; /* next sync log entry to read */ 131 u_int su_tail; /* next sync update entry to read */ 132 int ipf_sync_log_sz; 133 int ipf_sync_nat_tab_sz; 134 int ipf_sync_state_tab_sz; 135 int ipf_sync_debug; 136 int ipf_sync_events; 137 u_32_t ipf_sync_lastwakeup; 138 int ipf_sync_wake_interval; 139 int ipf_sync_event_high_wm; 140 int ipf_sync_queue_high_wm; 141 int ipf_sync_inited; 142 } ipf_sync_softc_t; 143 144 static int ipf_sync_flush_table(ipf_sync_softc_t *, int, synclist_t **); 145 static void ipf_sync_wakeup(ipf_main_softc_t *); 146 static void ipf_sync_del(ipf_sync_softc_t *, synclist_t *); 147 static void ipf_sync_poll_wakeup(ipf_main_softc_t *); 148 static int ipf_sync_nat(ipf_main_softc_t *, synchdr_t *, void *); 149 static int ipf_sync_state(ipf_main_softc_t *, synchdr_t *, void *); 150 151 # if !defined(sparc) && !defined(__hppa) 152 void ipf_sync_tcporder(int, struct tcpdata *); 153 void ipf_sync_natorder(int, struct nat *); 154 void ipf_sync_storder(int, struct ipstate *); 155 # endif 156 157 158 void * 159 ipf_sync_soft_create(ipf_main_softc_t *softc) 160 { 161 ipf_sync_softc_t *softs; 162 163 KMALLOC(softs, ipf_sync_softc_t *); 164 if (softs == NULL) { 165 IPFERROR(110024); 166 return NULL; 167 } 168 169 bzero((char *)softs, sizeof(*softs)); 170 171 softs->ipf_sync_log_sz = SYNCLOG_SZ; 172 softs->ipf_sync_nat_tab_sz = SYNC_STATETABSZ; 173 softs->ipf_sync_state_tab_sz = SYNC_STATETABSZ; 174 softs->ipf_sync_event_high_wm = SYNCLOG_SZ * 100 / 90; /* 90% */ 175 softs->ipf_sync_queue_high_wm = SYNCLOG_SZ * 100 / 90; /* 90% */ 176 177 return softs; 178 } 179 180 181 /* ------------------------------------------------------------------------ */ 182 /* Function: ipf_sync_init */ 183 /* Returns: int - 0 == success, -1 == failure */ 184 /* Parameters: Nil */ 185 /* */ 186 /* Initialise all of the locks required for the sync code and initialise */ 187 /* any data structures, as required. */ 188 /* ------------------------------------------------------------------------ */ 189 int 190 ipf_sync_soft_init(ipf_main_softc_t *softc, void *arg) 191 { 192 ipf_sync_softc_t *softs = arg; 193 194 KMALLOCS(softs->synclog, synclogent_t *, 195 softs->ipf_sync_log_sz * sizeof(*softs->synclog)); 196 if (softs->synclog == NULL) 197 return -1; 198 bzero((char *)softs->synclog, 199 softs->ipf_sync_log_sz * sizeof(*softs->synclog)); 200 201 KMALLOCS(softs->syncupd, syncupdent_t *, 202 softs->ipf_sync_log_sz * sizeof(*softs->syncupd)); 203 if (softs->syncupd == NULL) 204 return -2; 205 bzero((char *)softs->syncupd, 206 softs->ipf_sync_log_sz * sizeof(*softs->syncupd)); 207 208 KMALLOCS(softs->syncstatetab, synclist_t **, 209 softs->ipf_sync_state_tab_sz * sizeof(*softs->syncstatetab)); 210 if (softs->syncstatetab == NULL) 211 return -3; 212 bzero((char *)softs->syncstatetab, 213 softs->ipf_sync_state_tab_sz * sizeof(*softs->syncstatetab)); 214 215 KMALLOCS(softs->syncnattab, synclist_t **, 216 softs->ipf_sync_nat_tab_sz * sizeof(*softs->syncnattab)); 217 if (softs->syncnattab == NULL) 218 return -3; 219 bzero((char *)softs->syncnattab, 220 softs->ipf_sync_nat_tab_sz * sizeof(*softs->syncnattab)); 221 222 softs->ipf_sync_num = 1; 223 softs->ipf_sync_wrap = 0; 224 softs->sl_idx = 0; 225 softs->su_idx = 0; 226 softs->sl_tail = 0; 227 softs->su_tail = 0; 228 softs->ipf_sync_events = 0; 229 softs->ipf_sync_lastwakeup = 0; 230 231 232 # if SOLARIS && defined(_KERNEL) 233 cv_init(&softs->ipslwait, "ipsl condvar", CV_DRIVER, NULL); 234 # endif 235 RWLOCK_INIT(&softs->ipf_syncstate, "add things to state sync table"); 236 RWLOCK_INIT(&softs->ipf_syncnat, "add things to nat sync table"); 237 MUTEX_INIT(&softs->ipf_syncadd, "add things to sync table"); 238 MUTEX_INIT(&softs->ipsl_mutex, "read ring lock"); 239 240 softs->ipf_sync_inited = 1; 241 242 return 0; 243 } 244 245 246 /* ------------------------------------------------------------------------ */ 247 /* Function: ipf_sync_unload */ 248 /* Returns: int - 0 == success, -1 == failure */ 249 /* Parameters: Nil */ 250 /* */ 251 /* Destroy the locks created when initialising and free any memory in use */ 252 /* with the synchronisation tables. */ 253 /* ------------------------------------------------------------------------ */ 254 int 255 ipf_sync_soft_fini(ipf_main_softc_t *softc, void *arg) 256 { 257 ipf_sync_softc_t *softs = arg; 258 259 if (softs->syncnattab != NULL) { 260 ipf_sync_flush_table(softs, softs->ipf_sync_nat_tab_sz, 261 softs->syncnattab); 262 KFREES(softs->syncnattab, 263 softs->ipf_sync_nat_tab_sz * sizeof(*softs->syncnattab)); 264 softs->syncnattab = NULL; 265 } 266 267 if (softs->syncstatetab != NULL) { 268 ipf_sync_flush_table(softs, softs->ipf_sync_state_tab_sz, 269 softs->syncstatetab); 270 KFREES(softs->syncstatetab, 271 softs->ipf_sync_state_tab_sz * 272 sizeof(*softs->syncstatetab)); 273 softs->syncstatetab = NULL; 274 } 275 276 if (softs->syncupd != NULL) { 277 KFREES(softs->syncupd, 278 softs->ipf_sync_log_sz * sizeof(*softs->syncupd)); 279 softs->syncupd = NULL; 280 } 281 282 if (softs->synclog != NULL) { 283 KFREES(softs->synclog, 284 softs->ipf_sync_log_sz * sizeof(*softs->synclog)); 285 softs->synclog = NULL; 286 } 287 288 if (softs->ipf_sync_inited == 1) { 289 MUTEX_DESTROY(&softs->ipsl_mutex); 290 MUTEX_DESTROY(&softs->ipf_syncadd); 291 RW_DESTROY(&softs->ipf_syncnat); 292 RW_DESTROY(&softs->ipf_syncstate); 293 softs->ipf_sync_inited = 0; 294 } 295 296 return 0; 297 } 298 299 void 300 ipf_sync_soft_destroy(ipf_main_softc_t *softc, void *arg) 301 { 302 ipf_sync_softc_t *softs = arg; 303 304 KFREE(softs); 305 } 306 307 308 # if !defined(sparc) && !defined(__hppa) 309 /* ------------------------------------------------------------------------ */ 310 /* Function: ipf_sync_tcporder */ 311 /* Returns: Nil */ 312 /* Parameters: way(I) - direction of byte order conversion. */ 313 /* td(IO) - pointer to data to be converted. */ 314 /* */ 315 /* Do byte swapping on values in the TCP state information structure that */ 316 /* need to be used at both ends by the host in their native byte order. */ 317 /* ------------------------------------------------------------------------ */ 318 void 319 ipf_sync_tcporder(int way, tcpdata_t *td) 320 { 321 if (way) { 322 td->td_maxwin = htons(td->td_maxwin); 323 td->td_end = htonl(td->td_end); 324 td->td_maxend = htonl(td->td_maxend); 325 } else { 326 td->td_maxwin = ntohs(td->td_maxwin); 327 td->td_end = ntohl(td->td_end); 328 td->td_maxend = ntohl(td->td_maxend); 329 } 330 } 331 332 333 /* ------------------------------------------------------------------------ */ 334 /* Function: ipf_sync_natorder */ 335 /* Returns: Nil */ 336 /* Parameters: way(I) - direction of byte order conversion. */ 337 /* nat(IO) - pointer to data to be converted. */ 338 /* */ 339 /* Do byte swapping on values in the NAT data structure that need to be */ 340 /* used at both ends by the host in their native byte order. */ 341 /* ------------------------------------------------------------------------ */ 342 void 343 ipf_sync_natorder(int way, nat_t *n) 344 { 345 if (way) { 346 n->nat_age = htonl(n->nat_age); 347 n->nat_flags = htonl(n->nat_flags); 348 n->nat_ipsumd = htonl(n->nat_ipsumd); 349 n->nat_use = htonl(n->nat_use); 350 n->nat_dir = htonl(n->nat_dir); 351 } else { 352 n->nat_age = ntohl(n->nat_age); 353 n->nat_flags = ntohl(n->nat_flags); 354 n->nat_ipsumd = ntohl(n->nat_ipsumd); 355 n->nat_use = ntohl(n->nat_use); 356 n->nat_dir = ntohl(n->nat_dir); 357 } 358 } 359 360 361 /* ------------------------------------------------------------------------ */ 362 /* Function: ipf_sync_storder */ 363 /* Returns: Nil */ 364 /* Parameters: way(I) - direction of byte order conversion. */ 365 /* ips(IO) - pointer to data to be converted. */ 366 /* */ 367 /* Do byte swapping on values in the IP state data structure that need to */ 368 /* be used at both ends by the host in their native byte order. */ 369 /* ------------------------------------------------------------------------ */ 370 void 371 ipf_sync_storder(int way, ipstate_t *ips) 372 { 373 ipf_sync_tcporder(way, &ips->is_tcp.ts_data[0]); 374 ipf_sync_tcporder(way, &ips->is_tcp.ts_data[1]); 375 376 if (way) { 377 ips->is_hv = htonl(ips->is_hv); 378 ips->is_die = htonl(ips->is_die); 379 ips->is_pass = htonl(ips->is_pass); 380 ips->is_flags = htonl(ips->is_flags); 381 ips->is_opt[0] = htonl(ips->is_opt[0]); 382 ips->is_opt[1] = htonl(ips->is_opt[1]); 383 ips->is_optmsk[0] = htonl(ips->is_optmsk[0]); 384 ips->is_optmsk[1] = htonl(ips->is_optmsk[1]); 385 ips->is_sec = htons(ips->is_sec); 386 ips->is_secmsk = htons(ips->is_secmsk); 387 ips->is_auth = htons(ips->is_auth); 388 ips->is_authmsk = htons(ips->is_authmsk); 389 ips->is_s0[0] = htonl(ips->is_s0[0]); 390 ips->is_s0[1] = htonl(ips->is_s0[1]); 391 ips->is_smsk[0] = htons(ips->is_smsk[0]); 392 ips->is_smsk[1] = htons(ips->is_smsk[1]); 393 } else { 394 ips->is_hv = ntohl(ips->is_hv); 395 ips->is_die = ntohl(ips->is_die); 396 ips->is_pass = ntohl(ips->is_pass); 397 ips->is_flags = ntohl(ips->is_flags); 398 ips->is_opt[0] = ntohl(ips->is_opt[0]); 399 ips->is_opt[1] = ntohl(ips->is_opt[1]); 400 ips->is_optmsk[0] = ntohl(ips->is_optmsk[0]); 401 ips->is_optmsk[1] = ntohl(ips->is_optmsk[1]); 402 ips->is_sec = ntohs(ips->is_sec); 403 ips->is_secmsk = ntohs(ips->is_secmsk); 404 ips->is_auth = ntohs(ips->is_auth); 405 ips->is_authmsk = ntohs(ips->is_authmsk); 406 ips->is_s0[0] = ntohl(ips->is_s0[0]); 407 ips->is_s0[1] = ntohl(ips->is_s0[1]); 408 ips->is_smsk[0] = ntohl(ips->is_smsk[0]); 409 ips->is_smsk[1] = ntohl(ips->is_smsk[1]); 410 } 411 } 412 # else /* !defined(sparc) && !defined(__hppa) */ 413 # define ipf_sync_tcporder(x,y) 414 # define ipf_sync_natorder(x,y) 415 # define ipf_sync_storder(x,y) 416 # endif /* !defined(sparc) && !defined(__hppa) */ 417 418 419 /* ------------------------------------------------------------------------ */ 420 /* Function: ipf_sync_write */ 421 /* Returns: int - 0 == success, else error value. */ 422 /* Parameters: uio(I) - pointer to information about data to write */ 423 /* */ 424 /* Moves data from user space into the kernel and uses it for updating data */ 425 /* structures in the state/NAT tables. */ 426 /* ------------------------------------------------------------------------ */ 427 int 428 ipf_sync_write(ipf_main_softc_t *softc, struct uio *uio) 429 { 430 ipf_sync_softc_t *softs = softc->ipf_sync_soft; 431 synchdr_t sh; 432 433 /* 434 * THIS MUST BE SUFFICIENT LARGE TO STORE 435 * ANY POSSIBLE DATA TYPE 436 */ 437 char data[2048]; 438 439 int err = 0; 440 441 # if BSD_GE_YEAR(199306) || defined(__FreeBSD__) || defined(__osf__) 442 uio->uio_rw = UIO_WRITE; 443 # endif 444 445 /* Try to get bytes */ 446 while (uio->uio_resid > 0) { 447 448 if (uio->uio_resid >= sizeof(sh)) { 449 450 err = UIOMOVE((void *)&sh, sizeof(sh), UIO_WRITE, uio); 451 452 if (err) { 453 if (softs->ipf_sync_debug > 2) 454 printf("uiomove(header) failed: %d\n", 455 err); 456 return err; 457 } 458 459 /* convert to host order */ 460 sh.sm_magic = ntohl(sh.sm_magic); 461 sh.sm_len = ntohl(sh.sm_len); 462 sh.sm_num = ntohl(sh.sm_num); 463 464 if (softs->ipf_sync_debug > 8) 465 printf("[%d] Read v:%d p:%d cmd:%d table:%d rev:%d len:%d magic:%x\n", 466 sh.sm_num, sh.sm_v, sh.sm_p, sh.sm_cmd, 467 sh.sm_table, sh.sm_rev, sh.sm_len, 468 sh.sm_magic); 469 470 if (sh.sm_magic != SYNHDRMAGIC) { 471 if (softs->ipf_sync_debug > 2) 472 printf("uiomove(header) invalid %s\n", 473 "magic"); 474 IPFERROR(110001); 475 return EINVAL; 476 } 477 478 if (sh.sm_v != 4 && sh.sm_v != 6) { 479 if (softs->ipf_sync_debug > 2) 480 printf("uiomove(header) invalid %s\n", 481 "protocol"); 482 IPFERROR(110002); 483 return EINVAL; 484 } 485 486 if (sh.sm_cmd > SMC_MAXCMD) { 487 if (softs->ipf_sync_debug > 2) 488 printf("uiomove(header) invalid %s\n", 489 "command"); 490 IPFERROR(110003); 491 return EINVAL; 492 } 493 494 495 if (sh.sm_table > SMC_MAXTBL) { 496 if (softs->ipf_sync_debug > 2) 497 printf("uiomove(header) invalid %s\n", 498 "table"); 499 IPFERROR(110004); 500 return EINVAL; 501 } 502 503 } else { 504 /* unsufficient data, wait until next call */ 505 if (softs->ipf_sync_debug > 2) 506 printf("uiomove(header) insufficient data"); 507 IPFERROR(110005); 508 return EAGAIN; 509 } 510 511 512 /* 513 * We have a header, so try to read the amount of data 514 * needed for the request 515 */ 516 517 /* not supported */ 518 if (sh.sm_len == 0) { 519 if (softs->ipf_sync_debug > 2) 520 printf("uiomove(data zero length %s\n", 521 "not supported"); 522 IPFERROR(110006); 523 return EINVAL; 524 } 525 526 if (uio->uio_resid >= sh.sm_len) { 527 528 err = UIOMOVE((void *)data, sh.sm_len, UIO_WRITE, uio); 529 530 if (err) { 531 if (softs->ipf_sync_debug > 2) 532 printf("uiomove(data) failed: %d\n", 533 err); 534 return err; 535 } 536 537 if (softs->ipf_sync_debug > 7) 538 printf("uiomove(data) %d bytes read\n", 539 sh.sm_len); 540 541 if (sh.sm_table == SMC_STATE) 542 err = ipf_sync_state(softc, &sh, data); 543 else if (sh.sm_table == SMC_NAT) 544 err = ipf_sync_nat(softc, &sh, data); 545 if (softs->ipf_sync_debug > 7) 546 printf("[%d] Finished with error %d\n", 547 sh.sm_num, err); 548 549 } else { 550 /* insufficient data, wait until next call */ 551 if (softs->ipf_sync_debug > 2) 552 printf("uiomove(data) %s %d bytes, got %d\n", 553 "insufficient data, need", 554 sh.sm_len, (int)uio->uio_resid); 555 IPFERROR(110007); 556 return EAGAIN; 557 } 558 } 559 560 /* no more data */ 561 return 0; 562 } 563 564 565 /* ------------------------------------------------------------------------ */ 566 /* Function: ipf_sync_read */ 567 /* Returns: int - 0 == success, else error value. */ 568 /* Parameters: uio(O) - pointer to information about where to store data */ 569 /* */ 570 /* This function is called when a user program wants to read some data */ 571 /* for pending state/NAT updates. If no data is available, the caller is */ 572 /* put to sleep, pending a wakeup from the "lower half" of this code. */ 573 /* ------------------------------------------------------------------------ */ 574 int 575 ipf_sync_read(ipf_main_softc_t *softc, struct uio *uio) 576 { 577 ipf_sync_softc_t *softs = softc->ipf_sync_soft; 578 syncupdent_t *su; 579 synclogent_t *sl; 580 int err = 0; 581 582 if ((uio->uio_resid & 3) || (uio->uio_resid < 8)) { 583 IPFERROR(110008); 584 return EINVAL; 585 } 586 587 # if BSD_GE_YEAR(199306) || defined(__FreeBSD__) || defined(__osf__) 588 uio->uio_rw = UIO_READ; 589 # endif 590 591 MUTEX_ENTER(&softs->ipsl_mutex); 592 while ((softs->sl_tail == softs->sl_idx) && 593 (softs->su_tail == softs->su_idx)) { 594 # if defined(_KERNEL) 595 # if SOLARIS 596 if (!cv_wait_sig(&softs->ipslwait, &softs->ipsl_mutex.ipf_lk)) { 597 MUTEX_EXIT(&softs->ipsl_mutex); 598 IPFERROR(110009); 599 return EINTR; 600 } 601 # else 602 # ifdef __hpux 603 { 604 lock_t *l; 605 606 l = get_sleep_lock(&softs->sl_tail); 607 err = sleep(&softs->sl_tail, PZERO+1); 608 if (err) { 609 MUTEX_EXIT(&softs->ipsl_mutex); 610 IPFERROR(110010); 611 return EINTR; 612 } 613 spinunlock(l); 614 } 615 # else /* __hpux */ 616 # ifdef __osf__ 617 err = mpsleep(&softs->sl_tail, PSUSP|PCATCH, "ipl sleep", 0, 618 &softs->ipsl_mutex, MS_LOCK_SIMPLE); 619 if (err) { 620 IPFERROR(110011); 621 return EINTR; 622 } 623 # else 624 MUTEX_EXIT(&softs->ipsl_mutex); 625 err = SLEEP(&softs->sl_tail, "ipl sleep"); 626 if (err) { 627 IPFERROR(110012); 628 return EINTR; 629 } 630 MUTEX_ENTER(&softs->ipsl_mutex); 631 # endif /* __osf__ */ 632 # endif /* __hpux */ 633 # endif /* SOLARIS */ 634 # endif /* _KERNEL */ 635 } 636 637 while ((softs->sl_tail < softs->sl_idx) && 638 (uio->uio_resid > sizeof(*sl))) { 639 sl = softs->synclog + softs->sl_tail++; 640 MUTEX_EXIT(&softs->ipsl_mutex); 641 err = UIOMOVE(sl, sizeof(*sl), UIO_READ, uio); 642 if (err != 0) 643 goto goterror; 644 MUTEX_ENTER(&softs->ipsl_mutex); 645 } 646 647 while ((softs->su_tail < softs->su_idx) && 648 (uio->uio_resid > sizeof(*su))) { 649 su = softs->syncupd + softs->su_tail; 650 softs->su_tail++; 651 MUTEX_EXIT(&softs->ipsl_mutex); 652 err = UIOMOVE(su, sizeof(*su), UIO_READ, uio); 653 if (err != 0) 654 goto goterror; 655 MUTEX_ENTER(&softs->ipsl_mutex); 656 if (su->sup_hdr.sm_sl != NULL) 657 su->sup_hdr.sm_sl->sl_idx = -1; 658 } 659 if (softs->sl_tail == softs->sl_idx) 660 softs->sl_tail = softs->sl_idx = 0; 661 if (softs->su_tail == softs->su_idx) 662 softs->su_tail = softs->su_idx = 0; 663 MUTEX_EXIT(&softs->ipsl_mutex); 664 goterror: 665 return err; 666 } 667 668 669 /* ------------------------------------------------------------------------ */ 670 /* Function: ipf_sync_state */ 671 /* Returns: int - 0 == success, else error value. */ 672 /* Parameters: sp(I) - pointer to sync packet data header */ 673 /* uio(I) - pointer to user data for further information */ 674 /* */ 675 /* Updates the state table according to information passed in the sync */ 676 /* header. As required, more data is fetched from the uio structure but */ 677 /* varies depending on the contents of the sync header. This function can */ 678 /* create a new state entry or update one. Deletion is left to the state */ 679 /* structures being timed out correctly. */ 680 /* ------------------------------------------------------------------------ */ 681 static int 682 ipf_sync_state(ipf_main_softc_t *softc, synchdr_t *sp, void *data) 683 { 684 ipf_sync_softc_t *softs = softc->ipf_sync_soft; 685 synctcp_update_t su; 686 ipstate_t *is, sn; 687 synclist_t *sl; 688 frentry_t *fr; 689 u_int hv; 690 int err = 0; 691 692 hv = sp->sm_num & (softs->ipf_sync_state_tab_sz - 1); 693 694 switch (sp->sm_cmd) 695 { 696 case SMC_CREATE : 697 698 bcopy(data, &sn, sizeof(sn)); 699 KMALLOC(is, ipstate_t *); 700 if (is == NULL) { 701 IPFERROR(110013); 702 err = ENOMEM; 703 break; 704 } 705 706 KMALLOC(sl, synclist_t *); 707 if (sl == NULL) { 708 IPFERROR(110014); 709 err = ENOMEM; 710 KFREE(is); 711 break; 712 } 713 714 bzero((char *)is, offsetof(ipstate_t, is_die)); 715 bcopy((char *)&sn.is_die, (char *)&is->is_die, 716 sizeof(*is) - offsetof(ipstate_t, is_die)); 717 ipf_sync_storder(0, is); 718 719 /* 720 * We need to find the same rule on the slave as was used on 721 * the master to create this state entry. 722 */ 723 READ_ENTER(&softc->ipf_mutex); 724 fr = ipf_getrulen(softc, IPL_LOGIPF, sn.is_group, sn.is_rulen); 725 if (fr != NULL) { 726 MUTEX_ENTER(&fr->fr_lock); 727 fr->fr_ref++; 728 fr->fr_statecnt++; 729 MUTEX_EXIT(&fr->fr_lock); 730 } 731 RWLOCK_EXIT(&softc->ipf_mutex); 732 733 if (softs->ipf_sync_debug > 4) 734 printf("[%d] Filter rules = %p\n", sp->sm_num, fr); 735 736 is->is_rule = fr; 737 is->is_sync = sl; 738 739 sl->sl_idx = -1; 740 sl->sl_ips = is; 741 bcopy(sp, &sl->sl_hdr, sizeof(struct synchdr)); 742 743 WRITE_ENTER(&softs->ipf_syncstate); 744 WRITE_ENTER(&softc->ipf_state); 745 746 sl->sl_pnext = softs->syncstatetab + hv; 747 sl->sl_next = softs->syncstatetab[hv]; 748 if (softs->syncstatetab[hv] != NULL) 749 softs->syncstatetab[hv]->sl_pnext = &sl->sl_next; 750 softs->syncstatetab[hv] = sl; 751 MUTEX_DOWNGRADE(&softs->ipf_syncstate); 752 ipf_state_insert(softc, is, sp->sm_rev); 753 /* 754 * Do not initialise the interface pointers for the state 755 * entry as the full complement of interface names may not 756 * be present. 757 * 758 * Put this state entry on its timeout queue. 759 */ 760 /*fr_setstatequeue(is, sp->sm_rev);*/ 761 break; 762 763 case SMC_UPDATE : 764 bcopy(data, &su, sizeof(su)); 765 766 if (softs->ipf_sync_debug > 4) 767 printf("[%d] Update age %lu state %d/%d \n", 768 sp->sm_num, su.stu_age, su.stu_state[0], 769 su.stu_state[1]); 770 771 READ_ENTER(&softs->ipf_syncstate); 772 for (sl = softs->syncstatetab[hv]; (sl != NULL); 773 sl = sl->sl_next) 774 if (sl->sl_hdr.sm_num == sp->sm_num) 775 break; 776 if (sl == NULL) { 777 if (softs->ipf_sync_debug > 1) 778 printf("[%d] State not found - can't update\n", 779 sp->sm_num); 780 RWLOCK_EXIT(&softs->ipf_syncstate); 781 IPFERROR(110015); 782 err = ENOENT; 783 break; 784 } 785 786 READ_ENTER(&softc->ipf_state); 787 788 if (softs->ipf_sync_debug > 6) 789 printf("[%d] Data from state v:%d p:%d cmd:%d table:%d rev:%d\n", 790 sp->sm_num, sl->sl_hdr.sm_v, sl->sl_hdr.sm_p, 791 sl->sl_hdr.sm_cmd, sl->sl_hdr.sm_table, 792 sl->sl_hdr.sm_rev); 793 794 is = sl->sl_ips; 795 796 MUTEX_ENTER(&is->is_lock); 797 switch (sp->sm_p) 798 { 799 case IPPROTO_TCP : 800 /* XXX FV --- shouldn't we do ntohl/htonl???? XXX */ 801 is->is_send = su.stu_data[0].td_end; 802 is->is_maxsend = su.stu_data[0].td_maxend; 803 is->is_maxswin = su.stu_data[0].td_maxwin; 804 is->is_state[0] = su.stu_state[0]; 805 is->is_dend = su.stu_data[1].td_end; 806 is->is_maxdend = su.stu_data[1].td_maxend; 807 is->is_maxdwin = su.stu_data[1].td_maxwin; 808 is->is_state[1] = su.stu_state[1]; 809 break; 810 default : 811 break; 812 } 813 814 if (softs->ipf_sync_debug > 6) 815 printf("[%d] Setting timers for state\n", sp->sm_num); 816 817 ipf_state_setqueue(softc, is, sp->sm_rev); 818 819 MUTEX_EXIT(&is->is_lock); 820 break; 821 822 default : 823 IPFERROR(110016); 824 err = EINVAL; 825 break; 826 } 827 828 if (err == 0) { 829 RWLOCK_EXIT(&softc->ipf_state); 830 RWLOCK_EXIT(&softs->ipf_syncstate); 831 } 832 833 if (softs->ipf_sync_debug > 6) 834 printf("[%d] Update completed with error %d\n", 835 sp->sm_num, err); 836 837 return err; 838 } 839 840 841 /* ------------------------------------------------------------------------ */ 842 /* Function: ipf_sync_del */ 843 /* Returns: Nil */ 844 /* Parameters: sl(I) - pointer to synclist object to delete */ 845 /* */ 846 /* Deletes an object from the synclist. */ 847 /* ------------------------------------------------------------------------ */ 848 static void 849 ipf_sync_del(ipf_sync_softc_t *softs, synclist_t *sl) 850 { 851 *sl->sl_pnext = sl->sl_next; 852 if (sl->sl_next != NULL) 853 sl->sl_next->sl_pnext = sl->sl_pnext; 854 if (sl->sl_idx != -1) 855 softs->syncupd[sl->sl_idx].sup_hdr.sm_sl = NULL; 856 } 857 858 859 /* ------------------------------------------------------------------------ */ 860 /* Function: ipf_sync_del_state */ 861 /* Returns: Nil */ 862 /* Parameters: sl(I) - pointer to synclist object to delete */ 863 /* */ 864 /* Deletes an object from the synclist state table and free's its memory. */ 865 /* ------------------------------------------------------------------------ */ 866 void 867 ipf_sync_del_state(void *arg, synclist_t *sl) 868 { 869 ipf_sync_softc_t *softs = arg; 870 871 WRITE_ENTER(&softs->ipf_syncstate); 872 ipf_sync_del(softs, sl); 873 RWLOCK_EXIT(&softs->ipf_syncstate); 874 KFREE(sl); 875 } 876 877 878 /* ------------------------------------------------------------------------ */ 879 /* Function: ipf_sync_del_nat */ 880 /* Returns: Nil */ 881 /* Parameters: sl(I) - pointer to synclist object to delete */ 882 /* */ 883 /* Deletes an object from the synclist nat table and free's its memory. */ 884 /* ------------------------------------------------------------------------ */ 885 void 886 ipf_sync_del_nat(void *arg, synclist_t *sl) 887 { 888 ipf_sync_softc_t *softs = arg; 889 890 WRITE_ENTER(&softs->ipf_syncnat); 891 ipf_sync_del(softs, sl); 892 RWLOCK_EXIT(&softs->ipf_syncnat); 893 KFREE(sl); 894 } 895 896 897 /* ------------------------------------------------------------------------ */ 898 /* Function: ipf_sync_nat */ 899 /* Returns: int - 0 == success, else error value. */ 900 /* Parameters: sp(I) - pointer to sync packet data header */ 901 /* uio(I) - pointer to user data for further information */ 902 /* */ 903 /* Updates the NAT table according to information passed in the sync */ 904 /* header. As required, more data is fetched from the uio structure but */ 905 /* varies depending on the contents of the sync header. This function can */ 906 /* create a new NAT entry or update one. Deletion is left to the NAT */ 907 /* structures being timed out correctly. */ 908 /* ------------------------------------------------------------------------ */ 909 static int 910 ipf_sync_nat(ipf_main_softc_t *softc, synchdr_t *sp, void *data) 911 { 912 ipf_sync_softc_t *softs = softc->ipf_sync_soft; 913 syncupdent_t su; 914 nat_t *n, *nat; 915 synclist_t *sl; 916 u_int hv = 0; 917 int err = 0; 918 919 READ_ENTER(&softs->ipf_syncnat); 920 921 switch (sp->sm_cmd) 922 { 923 case SMC_CREATE : 924 KMALLOC(n, nat_t *); 925 if (n == NULL) { 926 IPFERROR(110017); 927 err = ENOMEM; 928 break; 929 } 930 931 KMALLOC(sl, synclist_t *); 932 if (sl == NULL) { 933 IPFERROR(110018); 934 err = ENOMEM; 935 KFREE(n); 936 break; 937 } 938 939 nat = (nat_t *)data; 940 bzero((char *)n, offsetof(nat_t, nat_age)); 941 bcopy((char *)&nat->nat_age, (char *)&n->nat_age, 942 sizeof(*n) - offsetof(nat_t, nat_age)); 943 ipf_sync_natorder(0, n); 944 n->nat_sync = sl; 945 n->nat_rev = sl->sl_rev; 946 947 sl->sl_idx = -1; 948 sl->sl_ipn = n; 949 sl->sl_num = ntohl(sp->sm_num); 950 951 WRITE_ENTER(&softc->ipf_nat); 952 sl->sl_pnext = softs->syncnattab + hv; 953 sl->sl_next = softs->syncnattab[hv]; 954 if (softs->syncnattab[hv] != NULL) 955 softs->syncnattab[hv]->sl_pnext = &sl->sl_next; 956 softs->syncnattab[hv] = sl; 957 (void) ipf_nat_insert(softc, softc->ipf_nat_soft, n); 958 RWLOCK_EXIT(&softc->ipf_nat); 959 break; 960 961 case SMC_UPDATE : 962 bcopy(data, &su, sizeof(su)); 963 964 for (sl = softs->syncnattab[hv]; (sl != NULL); 965 sl = sl->sl_next) 966 if (sl->sl_hdr.sm_num == sp->sm_num) 967 break; 968 if (sl == NULL) { 969 IPFERROR(110019); 970 err = ENOENT; 971 break; 972 } 973 974 READ_ENTER(&softc->ipf_nat); 975 976 nat = sl->sl_ipn; 977 nat->nat_rev = sl->sl_rev; 978 979 MUTEX_ENTER(&nat->nat_lock); 980 ipf_nat_setqueue(softc, softc->ipf_nat_soft, nat); 981 MUTEX_EXIT(&nat->nat_lock); 982 983 RWLOCK_EXIT(&softc->ipf_nat); 984 985 break; 986 987 default : 988 IPFERROR(110020); 989 err = EINVAL; 990 break; 991 } 992 993 RWLOCK_EXIT(&softs->ipf_syncnat); 994 return err; 995 } 996 997 998 /* ------------------------------------------------------------------------ */ 999 /* Function: ipf_sync_new */ 1000 /* Returns: synclist_t* - NULL == failure, else pointer to new synclist */ 1001 /* data structure. */ 1002 /* Parameters: tab(I) - type of synclist_t to create */ 1003 /* fin(I) - pointer to packet information */ 1004 /* ptr(I) - pointer to owning object */ 1005 /* */ 1006 /* Creates a new sync table entry and notifies any sleepers that it's there */ 1007 /* waiting to be processed. */ 1008 /* ------------------------------------------------------------------------ */ 1009 synclist_t * 1010 ipf_sync_new(ipf_main_softc_t *softc, int tab, fr_info_t *fin, void *ptr) 1011 { 1012 ipf_sync_softc_t *softs = softc->ipf_sync_soft; 1013 synclist_t *sl, *ss; 1014 synclogent_t *sle; 1015 u_int hv, sz; 1016 1017 if (softs->sl_idx == softs->ipf_sync_log_sz) 1018 return NULL; 1019 KMALLOC(sl, synclist_t *); 1020 if (sl == NULL) 1021 return NULL; 1022 1023 MUTEX_ENTER(&softs->ipf_syncadd); 1024 /* 1025 * Get a unique number for this synclist_t. The number is only meant 1026 * to be unique for the lifetime of the structure and may be reused 1027 * later. 1028 */ 1029 softs->ipf_sync_num++; 1030 if (softs->ipf_sync_num == 0) { 1031 softs->ipf_sync_num = 1; 1032 softs->ipf_sync_wrap++; 1033 } 1034 1035 /* 1036 * Use the synch number of the object as the hash key. Should end up 1037 * with relatively even distribution over time. 1038 * XXX - an attacker could lunch an DoS attack, of sorts, if they are 1039 * the only one causing new table entries by only keeping open every 1040 * nth connection they make, where n is a value in the interval 1041 * [0, SYNC_STATETABSZ-1]. 1042 */ 1043 switch (tab) 1044 { 1045 case SMC_STATE : 1046 hv = softs->ipf_sync_num & (softs->ipf_sync_state_tab_sz - 1); 1047 while (softs->ipf_sync_wrap != 0) { 1048 for (ss = softs->syncstatetab[hv]; ss; ss = ss->sl_next) 1049 if (ss->sl_hdr.sm_num == softs->ipf_sync_num) 1050 break; 1051 if (ss == NULL) 1052 break; 1053 softs->ipf_sync_num++; 1054 hv = softs->ipf_sync_num & 1055 (softs->ipf_sync_state_tab_sz - 1); 1056 } 1057 sl->sl_pnext = softs->syncstatetab + hv; 1058 sl->sl_next = softs->syncstatetab[hv]; 1059 softs->syncstatetab[hv] = sl; 1060 break; 1061 1062 case SMC_NAT : 1063 hv = softs->ipf_sync_num & (softs->ipf_sync_nat_tab_sz - 1); 1064 while (softs->ipf_sync_wrap != 0) { 1065 for (ss = softs->syncnattab[hv]; ss; ss = ss->sl_next) 1066 if (ss->sl_hdr.sm_num == softs->ipf_sync_num) 1067 break; 1068 if (ss == NULL) 1069 break; 1070 softs->ipf_sync_num++; 1071 hv = softs->ipf_sync_num & 1072 (softs->ipf_sync_nat_tab_sz - 1); 1073 } 1074 sl->sl_pnext = softs->syncnattab + hv; 1075 sl->sl_next = softs->syncnattab[hv]; 1076 softs->syncnattab[hv] = sl; 1077 break; 1078 1079 default : 1080 break; 1081 } 1082 1083 sl->sl_num = softs->ipf_sync_num; 1084 MUTEX_EXIT(&softs->ipf_syncadd); 1085 1086 sl->sl_magic = htonl(SYNHDRMAGIC); 1087 sl->sl_v = fin->fin_v; 1088 sl->sl_p = fin->fin_p; 1089 sl->sl_cmd = SMC_CREATE; 1090 sl->sl_idx = -1; 1091 sl->sl_table = tab; 1092 sl->sl_rev = fin->fin_rev; 1093 if (tab == SMC_STATE) { 1094 sl->sl_ips = ptr; 1095 sz = sizeof(*sl->sl_ips); 1096 } else if (tab == SMC_NAT) { 1097 sl->sl_ipn = ptr; 1098 sz = sizeof(*sl->sl_ipn); 1099 } else { 1100 ptr = NULL; 1101 sz = 0; 1102 } 1103 sl->sl_len = sz; 1104 1105 /* 1106 * Create the log entry to be read by a user daemon. When it has been 1107 * finished and put on the queue, send a signal to wakeup any waiters. 1108 */ 1109 MUTEX_ENTER(&softs->ipf_syncadd); 1110 sle = softs->synclog + softs->sl_idx++; 1111 bcopy((char *)&sl->sl_hdr, (char *)&sle->sle_hdr, 1112 sizeof(sle->sle_hdr)); 1113 sle->sle_hdr.sm_num = htonl(sle->sle_hdr.sm_num); 1114 sle->sle_hdr.sm_len = htonl(sle->sle_hdr.sm_len); 1115 if (ptr != NULL) { 1116 bcopy((char *)ptr, (char *)&sle->sle_un, sz); 1117 if (tab == SMC_STATE) { 1118 ipf_sync_storder(1, &sle->sle_un.sleu_ips); 1119 } else if (tab == SMC_NAT) { 1120 ipf_sync_natorder(1, &sle->sle_un.sleu_ipn); 1121 } 1122 } 1123 MUTEX_EXIT(&softs->ipf_syncadd); 1124 1125 ipf_sync_wakeup(softc); 1126 return sl; 1127 } 1128 1129 1130 /* ------------------------------------------------------------------------ */ 1131 /* Function: ipf_sync_update */ 1132 /* Returns: Nil */ 1133 /* Parameters: tab(I) - type of synclist_t to create */ 1134 /* fin(I) - pointer to packet information */ 1135 /* sl(I) - pointer to synchronisation object */ 1136 /* */ 1137 /* For outbound packets, only, create an sync update record for the user */ 1138 /* process to read. */ 1139 /* ------------------------------------------------------------------------ */ 1140 void 1141 ipf_sync_update(ipf_main_softc_t *softc, int tab, fr_info_t *fin, 1142 synclist_t *sl) 1143 { 1144 ipf_sync_softc_t *softs = softc->ipf_sync_soft; 1145 synctcp_update_t *st; 1146 syncupdent_t *slu; 1147 ipstate_t *ips; 1148 nat_t *nat; 1149 ipfrwlock_t *lock; 1150 1151 if (fin->fin_out == 0 || sl == NULL) 1152 return; 1153 1154 if (tab == SMC_STATE) { 1155 lock = &softs->ipf_syncstate; 1156 } else { 1157 lock = &softs->ipf_syncnat; 1158 } 1159 1160 READ_ENTER(lock); 1161 if (sl->sl_idx == -1) { 1162 MUTEX_ENTER(&softs->ipf_syncadd); 1163 slu = softs->syncupd + softs->su_idx; 1164 sl->sl_idx = softs->su_idx++; 1165 MUTEX_EXIT(&softs->ipf_syncadd); 1166 1167 bcopy((char *)&sl->sl_hdr, (char *)&slu->sup_hdr, 1168 sizeof(slu->sup_hdr)); 1169 slu->sup_hdr.sm_magic = htonl(SYNHDRMAGIC); 1170 slu->sup_hdr.sm_sl = sl; 1171 slu->sup_hdr.sm_cmd = SMC_UPDATE; 1172 slu->sup_hdr.sm_table = tab; 1173 slu->sup_hdr.sm_num = htonl(sl->sl_num); 1174 slu->sup_hdr.sm_len = htonl(sizeof(struct synctcp_update)); 1175 slu->sup_hdr.sm_rev = fin->fin_rev; 1176 # if 0 1177 if (fin->fin_p == IPPROTO_TCP) { 1178 st->stu_len[0] = 0; 1179 st->stu_len[1] = 0; 1180 } 1181 # endif 1182 } else 1183 slu = softs->syncupd + sl->sl_idx; 1184 1185 /* 1186 * Only TCP has complex timeouts, others just use default timeouts. 1187 * For TCP, we only need to track the connection state and window. 1188 */ 1189 if (fin->fin_p == IPPROTO_TCP) { 1190 st = &slu->sup_tcp; 1191 if (tab == SMC_STATE) { 1192 ips = sl->sl_ips; 1193 st->stu_age = htonl(ips->is_die); 1194 st->stu_data[0].td_end = ips->is_send; 1195 st->stu_data[0].td_maxend = ips->is_maxsend; 1196 st->stu_data[0].td_maxwin = ips->is_maxswin; 1197 st->stu_state[0] = ips->is_state[0]; 1198 st->stu_data[1].td_end = ips->is_dend; 1199 st->stu_data[1].td_maxend = ips->is_maxdend; 1200 st->stu_data[1].td_maxwin = ips->is_maxdwin; 1201 st->stu_state[1] = ips->is_state[1]; 1202 } else if (tab == SMC_NAT) { 1203 nat = sl->sl_ipn; 1204 st->stu_age = htonl(nat->nat_age); 1205 } 1206 } 1207 RWLOCK_EXIT(lock); 1208 1209 ipf_sync_wakeup(softc); 1210 } 1211 1212 1213 /* ------------------------------------------------------------------------ */ 1214 /* Function: ipf_sync_flush_table */ 1215 /* Returns: int - number of entries freed by flushing table */ 1216 /* Parameters: tabsize(I) - size of the array pointed to by table */ 1217 /* table(I) - pointer to sync table to empty */ 1218 /* */ 1219 /* Walk through a table of sync entries and free each one. It is assumed */ 1220 /* that some lock is held so that nobody else tries to access the table */ 1221 /* during this cleanup. */ 1222 /* ------------------------------------------------------------------------ */ 1223 static int 1224 ipf_sync_flush_table(ipf_sync_softc_t *softs, int tabsize, synclist_t **table) 1225 { 1226 synclist_t *sl; 1227 int i, items; 1228 1229 items = 0; 1230 1231 for (i = 0; i < tabsize; i++) { 1232 while ((sl = table[i]) != NULL) { 1233 switch (sl->sl_table) { 1234 case SMC_STATE : 1235 if (sl->sl_ips != NULL) 1236 sl->sl_ips->is_sync = NULL; 1237 break; 1238 case SMC_NAT : 1239 if (sl->sl_ipn != NULL) 1240 sl->sl_ipn->nat_sync = NULL; 1241 break; 1242 } 1243 if (sl->sl_next != NULL) 1244 sl->sl_next->sl_pnext = sl->sl_pnext; 1245 table[i] = sl->sl_next; 1246 if (sl->sl_idx != -1) 1247 softs->syncupd[sl->sl_idx].sup_hdr.sm_sl = NULL; 1248 KFREE(sl); 1249 items++; 1250 } 1251 } 1252 1253 return items; 1254 } 1255 1256 1257 /* ------------------------------------------------------------------------ */ 1258 /* Function: ipf_sync_ioctl */ 1259 /* Returns: int - 0 == success, != 0 == failure */ 1260 /* Parameters: data(I) - pointer to ioctl data */ 1261 /* cmd(I) - ioctl command integer */ 1262 /* mode(I) - file mode bits used with open */ 1263 /* */ 1264 /* This function currently does not handle any ioctls and so just returns */ 1265 /* EINVAL on all occasions. */ 1266 /* ------------------------------------------------------------------------ */ 1267 int 1268 ipf_sync_ioctl(ipf_main_softc_t *softc, void *data, ioctlcmd_t cmd, int mode, 1269 int uid, void *ctx) 1270 { 1271 ipf_sync_softc_t *softs = softc->ipf_sync_soft; 1272 int error, i; 1273 SPL_INT(s); 1274 1275 switch (cmd) 1276 { 1277 case SIOCIPFFL: 1278 error = BCOPYIN(data, &i, sizeof(i)); 1279 if (error != 0) { 1280 IPFERROR(110023); 1281 error = EFAULT; 1282 break; 1283 } 1284 1285 switch (i) 1286 { 1287 case SMC_RLOG : 1288 SPL_NET(s); 1289 MUTEX_ENTER(&softs->ipsl_mutex); 1290 i = (softs->sl_tail - softs->sl_idx) + 1291 (softs->su_tail - softs->su_idx); 1292 softs->sl_idx = 0; 1293 softs->su_idx = 0; 1294 softs->sl_tail = 0; 1295 softs->su_tail = 0; 1296 MUTEX_EXIT(&softs->ipsl_mutex); 1297 SPL_X(s); 1298 break; 1299 1300 case SMC_NAT : 1301 SPL_NET(s); 1302 WRITE_ENTER(&softs->ipf_syncnat); 1303 i = ipf_sync_flush_table(softs, SYNC_NATTABSZ, 1304 softs->syncnattab); 1305 RWLOCK_EXIT(&softs->ipf_syncnat); 1306 SPL_X(s); 1307 break; 1308 1309 case SMC_STATE : 1310 SPL_NET(s); 1311 WRITE_ENTER(&softs->ipf_syncstate); 1312 i = ipf_sync_flush_table(softs, SYNC_STATETABSZ, 1313 softs->syncstatetab); 1314 RWLOCK_EXIT(&softs->ipf_syncstate); 1315 SPL_X(s); 1316 break; 1317 } 1318 1319 error = BCOPYOUT(&i, data, sizeof(i)); 1320 if (error != 0) { 1321 IPFERROR(110022); 1322 error = EFAULT; 1323 } 1324 break; 1325 1326 default : 1327 IPFERROR(110021); 1328 error = EINVAL; 1329 break; 1330 } 1331 1332 return error; 1333 } 1334 1335 1336 /* ------------------------------------------------------------------------ */ 1337 /* Function: ipf_sync_canread */ 1338 /* Returns: int - 0 == success, != 0 == failure */ 1339 /* Parameters: Nil */ 1340 /* */ 1341 /* This function provides input to the poll handler about whether or not */ 1342 /* there is data waiting to be read from the /dev/ipsync device. */ 1343 /* ------------------------------------------------------------------------ */ 1344 int 1345 ipf_sync_canread(void *arg) 1346 { 1347 ipf_sync_softc_t *softs = arg; 1348 return !((softs->sl_tail == softs->sl_idx) && 1349 (softs->su_tail == softs->su_idx)); 1350 } 1351 1352 1353 /* ------------------------------------------------------------------------ */ 1354 /* Function: ipf_sync_canwrite */ 1355 /* Returns: int - 1 == can always write */ 1356 /* Parameters: Nil */ 1357 /* */ 1358 /* This function lets the poll handler know that it is always ready willing */ 1359 /* to accept write events. */ 1360 /* XXX Maybe this should return false if the sync table is full? */ 1361 /* ------------------------------------------------------------------------ */ 1362 int 1363 ipf_sync_canwrite(void *arg) 1364 { 1365 return 1; 1366 } 1367 1368 1369 /* ------------------------------------------------------------------------ */ 1370 /* Function: ipf_sync_wakeup */ 1371 /* Parameters: Nil */ 1372 /* Returns: Nil */ 1373 /* */ 1374 /* This function implements the heuristics that decide how often to */ 1375 /* generate a poll wakeup for programs that are waiting for information */ 1376 /* about when they can do a read on /dev/ipsync. */ 1377 /* */ 1378 /* There are three different considerations here: */ 1379 /* - do not keep a program waiting too long: ipf_sync_wake_interval is the */ 1380 /* maximum number of ipf ticks to let pass by; */ 1381 /* - do not let the queue of ouststanding things to generate notifies for */ 1382 /* get too full (ipf_sync_queue_high_wm is the high water mark); */ 1383 /* - do not let too many events get collapsed in before deciding that the */ 1384 /* other host(s) need an update (ipf_sync_event_high_wm is the high water */ 1385 /* mark for this counter.) */ 1386 /* ------------------------------------------------------------------------ */ 1387 static void 1388 ipf_sync_wakeup(ipf_main_softc_t *softc) 1389 { 1390 ipf_sync_softc_t *softs = softc->ipf_sync_soft; 1391 1392 softs->ipf_sync_events++; 1393 if ((softc->ipf_ticks > 1394 softs->ipf_sync_lastwakeup + softs->ipf_sync_wake_interval) || 1395 (softs->ipf_sync_events > softs->ipf_sync_event_high_wm) || 1396 ((softs->sl_tail - softs->sl_idx) > 1397 softs->ipf_sync_queue_high_wm) || 1398 ((softs->su_tail - softs->su_idx) > 1399 softs->ipf_sync_queue_high_wm)) { 1400 1401 ipf_sync_poll_wakeup(softc); 1402 } 1403 } 1404 1405 1406 /* ------------------------------------------------------------------------ */ 1407 /* Function: ipf_sync_poll_wakeup */ 1408 /* Parameters: Nil */ 1409 /* Returns: Nil */ 1410 /* */ 1411 /* Deliver a poll wakeup and reset counters for two of the three heuristics */ 1412 /* ------------------------------------------------------------------------ */ 1413 static void 1414 ipf_sync_poll_wakeup(ipf_main_softc_t *softc) 1415 { 1416 ipf_sync_softc_t *softs = softc->ipf_sync_soft; 1417 1418 softs->ipf_sync_events = 0; 1419 softs->ipf_sync_lastwakeup = softc->ipf_ticks; 1420 1421 # ifdef _KERNEL 1422 # if SOLARIS 1423 MUTEX_ENTER(&softs->ipsl_mutex); 1424 cv_signal(&softs->ipslwait); 1425 MUTEX_EXIT(&softs->ipsl_mutex); 1426 pollwakeup(&softc->ipf_poll_head[IPL_LOGSYNC], POLLIN|POLLRDNORM); 1427 # else 1428 WAKEUP(&softs->sl_tail, 0); 1429 POLLWAKEUP(IPL_LOGSYNC); 1430 # endif 1431 # endif 1432 } 1433 1434 1435 /* ------------------------------------------------------------------------ */ 1436 /* Function: ipf_sync_expire */ 1437 /* Parameters: Nil */ 1438 /* Returns: Nil */ 1439 /* */ 1440 /* This is the function called even ipf_tick. It implements one of the */ 1441 /* three heuristics above *IF* there are events waiting. */ 1442 /* ------------------------------------------------------------------------ */ 1443 void 1444 ipf_sync_expire(ipf_main_softc_t *softc) 1445 { 1446 ipf_sync_softc_t *softs = softc->ipf_sync_soft; 1447 1448 if ((softs->ipf_sync_events > 0) && 1449 (softc->ipf_ticks > 1450 softs->ipf_sync_lastwakeup + softs->ipf_sync_wake_interval)) { 1451 ipf_sync_poll_wakeup(softc); 1452 } 1453 } 1454
Indexes created Sun Sep 21 16:09:51 GMT 2025