1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_pcb.h> 39 #include <netinet/sctp_header.h> 40 #include <netinet/sctputil.h> 41 #include <netinet/sctp_output.h> 42 #include <netinet/sctp_bsd_addr.h> 43 #include <netinet/sctp_uio.h> 44 #include <netinet/sctputil.h> 45 #include <netinet/sctp_timer.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_sysctl.h> 48 #include <netinet/sctp_indata.h> 49 #include <sys/unistd.h> 50 51 /* Declare all of our malloc named types */ 52 MALLOC_DEFINE(SCTP_M_MAP, "sctp_map", "sctp asoc map descriptor"); 53 MALLOC_DEFINE(SCTP_M_STRMI, "sctp_stri", "sctp stream in array"); 54 MALLOC_DEFINE(SCTP_M_STRMO, "sctp_stro", "sctp stream out array"); 55 MALLOC_DEFINE(SCTP_M_ASC_ADDR, "sctp_aadr", "sctp asconf address"); 56 MALLOC_DEFINE(SCTP_M_ASC_IT, "sctp_a_it", "sctp asconf iterator"); 57 MALLOC_DEFINE(SCTP_M_AUTH_CL, "sctp_atcl", "sctp auth chunklist"); 58 MALLOC_DEFINE(SCTP_M_AUTH_KY, "sctp_atky", "sctp auth key"); 59 MALLOC_DEFINE(SCTP_M_AUTH_HL, "sctp_athm", "sctp auth hmac list"); 60 MALLOC_DEFINE(SCTP_M_AUTH_IF, "sctp_athi", "sctp auth info"); 61 MALLOC_DEFINE(SCTP_M_STRESET, "sctp_stre", "sctp stream reset"); 62 MALLOC_DEFINE(SCTP_M_CMSG, "sctp_cmsg", "sctp CMSG buffer"); 63 MALLOC_DEFINE(SCTP_M_COPYAL, "sctp_cpal", "sctp copy all"); 64 MALLOC_DEFINE(SCTP_M_VRF, "sctp_vrf", "sctp vrf struct"); 65 MALLOC_DEFINE(SCTP_M_IFA, "sctp_ifa", "sctp ifa struct"); 66 MALLOC_DEFINE(SCTP_M_IFN, "sctp_ifn", "sctp ifn struct"); 67 MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block"); 68 MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list"); 69 MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control"); 70 MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option"); 71 MALLOC_DEFINE(SCTP_M_MCORE, "sctp_mcore", "sctp mcore queue"); 72 73 /* Global NON-VNET structure that controls the iterator */ 74 struct iterator_control sctp_it_ctl; 75 76 77 void 78 sctp_wakeup_iterator(void) 79 { 80 wakeup(&sctp_it_ctl.iterator_running); 81 } 82 83 static void 84 sctp_iterator_thread(void *v SCTP_UNUSED) 85 { 86 SCTP_IPI_ITERATOR_WQ_LOCK(); 87 /* In FreeBSD this thread never terminates. */ 88 for (;;) { 89 msleep(&sctp_it_ctl.iterator_running, 90 &sctp_it_ctl.ipi_iterator_wq_mtx, 91 0, "waiting_for_work", 0); 92 sctp_iterator_worker(); 93 } 94 } 95 96 void 97 sctp_startup_iterator(void) 98 { 99 static int called = 0; 100 int ret; 101 102 if (called) { 103 /* You only get one */ 104 return; 105 } 106 /* init the iterator head */ 107 called = 1; 108 sctp_it_ctl.iterator_running = 0; 109 sctp_it_ctl.iterator_flags = 0; 110 sctp_it_ctl.cur_it = NULL; 111 SCTP_ITERATOR_LOCK_INIT(); 112 SCTP_IPI_ITERATOR_WQ_INIT(); 113 TAILQ_INIT(&sctp_it_ctl.iteratorhead); 114 ret = kproc_create(sctp_iterator_thread, 115 (void *)NULL, 116 &sctp_it_ctl.thread_proc, 117 RFPROC, 118 SCTP_KTHREAD_PAGES, 119 SCTP_KTRHEAD_NAME); 120 } 121 122 #ifdef INET6 123 124 void 125 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa) 126 { 127 struct in6_ifaddr *ifa6; 128 129 ifa6 = (struct in6_ifaddr *)ifa->ifa; 130 ifa->flags = ifa6->ia6_flags; 131 if (!MODULE_GLOBAL(ip6_use_deprecated)) { 132 if (ifa->flags & 133 IN6_IFF_DEPRECATED) { 134 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE; 135 } else { 136 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 137 } 138 } else { 139 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 140 } 141 if (ifa->flags & 142 (IN6_IFF_DETACHED | 143 IN6_IFF_ANYCAST | 144 IN6_IFF_NOTREADY)) { 145 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE; 146 } else { 147 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 148 } 149 } 150 151 #endif /* INET6 */ 152 153 154 static uint32_t 155 sctp_is_desired_interface_type(struct ifnet *ifn) 156 { 157 int result; 158 159 /* check the interface type to see if it's one we care about */ 160 switch (ifn->if_type) { 161 case IFT_ETHER: 162 case IFT_ISO88023: 163 case IFT_ISO88024: 164 case IFT_ISO88025: 165 case IFT_ISO88026: 166 case IFT_STARLAN: 167 case IFT_P10: 168 case IFT_P80: 169 case IFT_HY: 170 case IFT_FDDI: 171 case IFT_XETHER: 172 case IFT_ISDNBASIC: 173 case IFT_ISDNPRIMARY: 174 case IFT_PTPSERIAL: 175 case IFT_OTHER: 176 case IFT_PPP: 177 case IFT_LOOP: 178 case IFT_SLIP: 179 case IFT_GIF: 180 case IFT_L2VLAN: 181 case IFT_STF: 182 case IFT_IP: 183 case IFT_IPOVERCDLC: 184 case IFT_IPOVERCLAW: 185 case IFT_PROPVIRTUAL: /* NetGraph Virtual too */ 186 case IFT_VIRTUALIPADDRESS: 187 result = 1; 188 break; 189 default: 190 result = 0; 191 } 192 193 return (result); 194 } 195 196 197 198 199 static void 200 sctp_init_ifns_for_vrf(int vrfid) 201 { 202 /* 203 * Here we must apply ANY locks needed by the IFN we access and also 204 * make sure we lock any IFA that exists as we float through the 205 * list of IFA's 206 */ 207 struct ifnet *ifn; 208 struct ifaddr *ifa; 209 struct sctp_ifa *sctp_ifa; 210 uint32_t ifa_flags; 211 212 #ifdef INET6 213 struct in6_ifaddr *ifa6; 214 215 #endif 216 217 IFNET_RLOCK(); 218 TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) { 219 if (sctp_is_desired_interface_type(ifn) == 0) { 220 /* non desired type */ 221 continue; 222 } 223 IF_ADDR_RLOCK(ifn); 224 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { 225 if (ifa->ifa_addr == NULL) { 226 continue; 227 } 228 switch (ifa->ifa_addr->sa_family) { 229 #ifdef INET 230 case AF_INET: 231 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) { 232 continue; 233 } 234 break; 235 #endif 236 #ifdef INET6 237 case AF_INET6: 238 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) { 239 /* skip unspecifed addresses */ 240 continue; 241 } 242 break; 243 #endif 244 default: 245 continue; 246 } 247 switch (ifa->ifa_addr->sa_family) { 248 #ifdef INET 249 case AF_INET: 250 ifa_flags = 0; 251 break; 252 #endif 253 #ifdef INET6 254 case AF_INET6: 255 ifa6 = (struct in6_ifaddr *)ifa; 256 ifa_flags = ifa6->ia6_flags; 257 break; 258 #endif 259 default: 260 ifa_flags = 0; 261 break; 262 } 263 sctp_ifa = sctp_add_addr_to_vrf(vrfid, 264 (void *)ifn, 265 ifn->if_index, 266 ifn->if_type, 267 ifn->if_xname, 268 (void *)ifa, 269 ifa->ifa_addr, 270 ifa_flags, 271 0); 272 if (sctp_ifa) { 273 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE; 274 } 275 } 276 IF_ADDR_RUNLOCK(ifn); 277 } 278 IFNET_RUNLOCK(); 279 } 280 281 void 282 sctp_init_vrf_list(int vrfid) 283 { 284 if (vrfid > SCTP_MAX_VRF_ID) 285 /* can't do that */ 286 return; 287 288 /* Don't care about return here */ 289 (void)sctp_allocate_vrf(vrfid); 290 291 /* 292 * Now we need to build all the ifn's for this vrf and there 293 * addresses 294 */ 295 sctp_init_ifns_for_vrf(vrfid); 296 } 297 298 void 299 sctp_addr_change(struct ifaddr *ifa, int cmd) 300 { 301 uint32_t ifa_flags = 0; 302 303 /* 304 * BSD only has one VRF, if this changes we will need to hook in the 305 * right things here to get the id to pass to the address managment 306 * routine. 307 */ 308 if (SCTP_BASE_VAR(first_time) == 0) { 309 /* Special test to see if my ::1 will showup with this */ 310 SCTP_BASE_VAR(first_time) = 1; 311 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID); 312 } 313 if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) { 314 /* don't know what to do with this */ 315 return; 316 } 317 if (ifa->ifa_addr == NULL) { 318 return; 319 } 320 if (sctp_is_desired_interface_type(ifa->ifa_ifp) == 0) { 321 /* non desired type */ 322 return; 323 } 324 switch (ifa->ifa_addr->sa_family) { 325 #ifdef INET 326 case AF_INET: 327 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) { 328 return; 329 } 330 break; 331 #endif 332 #ifdef INET6 333 case AF_INET6: 334 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags; 335 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) { 336 /* skip unspecifed addresses */ 337 return; 338 } 339 break; 340 #endif 341 default: 342 /* non inet/inet6 skip */ 343 return; 344 } 345 if (cmd == RTM_ADD) { 346 (void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp, 347 ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, ifa->ifa_ifp->if_xname, 348 (void *)ifa, ifa->ifa_addr, ifa_flags, 1); 349 } else { 350 351 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr, 352 ifa->ifa_ifp->if_index, 353 ifa->ifa_ifp->if_xname); 354 355 /* 356 * We don't bump refcount here so when it completes the 357 * final delete will happen. 358 */ 359 } 360 } 361 362 void 363 sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){ 364 struct ifnet *ifn; 365 struct ifaddr *ifa; 366 367 IFNET_RLOCK(); 368 TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) { 369 if (!(*pred) (ifn)) { 370 continue; 371 } 372 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { 373 sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE); 374 } 375 } 376 IFNET_RUNLOCK(); 377 } 378 379 struct mbuf * 380 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header, 381 int how, int allonebuf, int type) 382 { 383 struct mbuf *m = NULL; 384 385 m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0); 386 if (m == NULL) { 387 /* bad, no memory */ 388 return (m); 389 } 390 if (allonebuf) { 391 int siz; 392 393 if (SCTP_BUF_IS_EXTENDED(m)) { 394 siz = SCTP_BUF_EXTEND_SIZE(m); 395 } else { 396 if (want_header) 397 siz = MHLEN; 398 else 399 siz = MLEN; 400 } 401 if (siz < space_needed) { 402 m_freem(m); 403 return (NULL); 404 } 405 } 406 if (SCTP_BUF_NEXT(m)) { 407 sctp_m_freem(SCTP_BUF_NEXT(m)); 408 SCTP_BUF_NEXT(m) = NULL; 409 } 410 #ifdef SCTP_MBUF_LOGGING 411 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 412 if (SCTP_BUF_IS_EXTENDED(m)) { 413 sctp_log_mb(m, SCTP_MBUF_IALLOC); 414 } 415 } 416 #endif 417 return (m); 418 } 419 420 421 #ifdef SCTP_PACKET_LOGGING 422 void 423 sctp_packet_log(struct mbuf *m) 424 { 425 int *lenat, thisone; 426 void *copyto; 427 uint32_t *tick_tock; 428 int length; 429 int total_len; 430 int grabbed_lock = 0; 431 int value, newval, thisend, thisbegin; 432 433 /* 434 * Buffer layout. -sizeof this entry (total_len) -previous end 435 * (value) -ticks of log (ticks) o -ip packet o -as logged - 436 * where this started (thisbegin) x <--end points here 437 */ 438 length = SCTP_HEADER_LEN(m); 439 total_len = SCTP_SIZE32((length + (4 * sizeof(int)))); 440 /* Log a packet to the buffer. */ 441 if (total_len > SCTP_PACKET_LOG_SIZE) { 442 /* Can't log this packet I have not a buffer big enough */ 443 return; 444 } 445 if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) { 446 return; 447 } 448 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1); 449 try_again: 450 if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) { 451 SCTP_IP_PKTLOG_LOCK(); 452 grabbed_lock = 1; 453 again_locked: 454 value = SCTP_BASE_VAR(packet_log_end); 455 newval = SCTP_BASE_VAR(packet_log_end) + total_len; 456 if (newval >= SCTP_PACKET_LOG_SIZE) { 457 /* we wrapped */ 458 thisbegin = 0; 459 thisend = total_len; 460 } else { 461 thisbegin = SCTP_BASE_VAR(packet_log_end); 462 thisend = newval; 463 } 464 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) { 465 goto again_locked; 466 } 467 } else { 468 value = SCTP_BASE_VAR(packet_log_end); 469 newval = SCTP_BASE_VAR(packet_log_end) + total_len; 470 if (newval >= SCTP_PACKET_LOG_SIZE) { 471 /* we wrapped */ 472 thisbegin = 0; 473 thisend = total_len; 474 } else { 475 thisbegin = SCTP_BASE_VAR(packet_log_end); 476 thisend = newval; 477 } 478 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) { 479 goto try_again; 480 } 481 } 482 /* Sanity check */ 483 if (thisend >= SCTP_PACKET_LOG_SIZE) { 484 SCTP_PRINTF("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n", 485 thisbegin, 486 thisend, 487 SCTP_BASE_VAR(packet_log_writers), 488 grabbed_lock, 489 SCTP_BASE_VAR(packet_log_end)); 490 SCTP_BASE_VAR(packet_log_end) = 0; 491 goto no_log; 492 493 } 494 lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin]; 495 *lenat = total_len; 496 lenat++; 497 *lenat = value; 498 lenat++; 499 tick_tock = (uint32_t *) lenat; 500 lenat++; 501 *tick_tock = sctp_get_tick_count(); 502 copyto = (void *)lenat; 503 thisone = thisend - sizeof(int); 504 lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone]; 505 *lenat = thisbegin; 506 if (grabbed_lock) { 507 SCTP_IP_PKTLOG_UNLOCK(); 508 grabbed_lock = 0; 509 } 510 m_copydata(m, 0, length, (caddr_t)copyto); 511 no_log: 512 if (grabbed_lock) { 513 SCTP_IP_PKTLOG_UNLOCK(); 514 } 515 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1); 516 } 517 518 519 int 520 sctp_copy_out_packet_log(uint8_t * target, int length) 521 { 522 /* 523 * We wind through the packet log starting at start copying up to 524 * length bytes out. We return the number of bytes copied. 525 */ 526 int tocopy, this_copy; 527 int *lenat; 528 int did_delay = 0; 529 530 tocopy = length; 531 if (length < (int)(2 * sizeof(int))) { 532 /* not enough room */ 533 return (0); 534 } 535 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) { 536 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK); 537 again: 538 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) { 539 /* 540 * we delay here for just a moment hoping the 541 * writer(s) that were present when we entered will 542 * have left and we only have locking ones that will 543 * contend with us for the lock. This does not 544 * assure 100% access, but its good enough for a 545 * logging facility like this. 546 */ 547 did_delay = 1; 548 DELAY(10); 549 goto again; 550 } 551 } 552 SCTP_IP_PKTLOG_LOCK(); 553 lenat = (int *)target; 554 *lenat = SCTP_BASE_VAR(packet_log_end); 555 lenat++; 556 this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE); 557 memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy); 558 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) { 559 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 560 SCTP_PKTLOG_WRITERS_NEED_LOCK); 561 } 562 SCTP_IP_PKTLOG_UNLOCK(); 563 return (this_copy + sizeof(int)); 564 } 565 566 #endif 567