sctp_bsd_addr.c revision 296052
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: stable/10/sys/netinet/sctp_bsd_addr.c 296052 2016-02-25 18:46:06Z tuexen $"); 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 */ 52MALLOC_DEFINE(SCTP_M_MAP, "sctp_map", "sctp asoc map descriptor"); 53MALLOC_DEFINE(SCTP_M_STRMI, "sctp_stri", "sctp stream in array"); 54MALLOC_DEFINE(SCTP_M_STRMO, "sctp_stro", "sctp stream out array"); 55MALLOC_DEFINE(SCTP_M_ASC_ADDR, "sctp_aadr", "sctp asconf address"); 56MALLOC_DEFINE(SCTP_M_ASC_IT, "sctp_a_it", "sctp asconf iterator"); 57MALLOC_DEFINE(SCTP_M_AUTH_CL, "sctp_atcl", "sctp auth chunklist"); 58MALLOC_DEFINE(SCTP_M_AUTH_KY, "sctp_atky", "sctp auth key"); 59MALLOC_DEFINE(SCTP_M_AUTH_HL, "sctp_athm", "sctp auth hmac list"); 60MALLOC_DEFINE(SCTP_M_AUTH_IF, "sctp_athi", "sctp auth info"); 61MALLOC_DEFINE(SCTP_M_STRESET, "sctp_stre", "sctp stream reset"); 62MALLOC_DEFINE(SCTP_M_CMSG, "sctp_cmsg", "sctp CMSG buffer"); 63MALLOC_DEFINE(SCTP_M_COPYAL, "sctp_cpal", "sctp copy all"); 64MALLOC_DEFINE(SCTP_M_VRF, "sctp_vrf", "sctp vrf struct"); 65MALLOC_DEFINE(SCTP_M_IFA, "sctp_ifa", "sctp ifa struct"); 66MALLOC_DEFINE(SCTP_M_IFN, "sctp_ifn", "sctp ifn struct"); 67MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block"); 68MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list"); 69MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control"); 70MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option"); 71MALLOC_DEFINE(SCTP_M_MCORE, "sctp_mcore", "sctp mcore queue"); 72 73/* Global NON-VNET structure that controls the iterator */ 74struct iterator_control sctp_it_ctl; 75 76 77void 78sctp_wakeup_iterator(void) 79{ 80 wakeup(&sctp_it_ctl.iterator_running); 81} 82 83static void 84sctp_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 96void 97sctp_startup_iterator(void) 98{ 99 if (sctp_it_ctl.thread_proc) { 100 /* You only get one */ 101 return; 102 } 103 /* Initialize global locks here, thus only once. */ 104 SCTP_ITERATOR_LOCK_INIT(); 105 SCTP_IPI_ITERATOR_WQ_INIT(); 106 TAILQ_INIT(&sctp_it_ctl.iteratorhead); 107 kproc_create(sctp_iterator_thread, 108 (void *)NULL, 109 &sctp_it_ctl.thread_proc, 110 RFPROC, 111 SCTP_KTHREAD_PAGES, 112 SCTP_KTRHEAD_NAME); 113} 114 115#ifdef INET6 116 117void 118sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa) 119{ 120 struct in6_ifaddr *ifa6; 121 122 ifa6 = (struct in6_ifaddr *)ifa->ifa; 123 ifa->flags = ifa6->ia6_flags; 124 if (!MODULE_GLOBAL(ip6_use_deprecated)) { 125 if (ifa->flags & 126 IN6_IFF_DEPRECATED) { 127 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE; 128 } else { 129 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 130 } 131 } else { 132 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 133 } 134 if (ifa->flags & 135 (IN6_IFF_DETACHED | 136 IN6_IFF_ANYCAST | 137 IN6_IFF_NOTREADY)) { 138 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE; 139 } else { 140 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 141 } 142} 143 144#endif /* INET6 */ 145 146 147static uint32_t 148sctp_is_desired_interface_type(struct ifnet *ifn) 149{ 150 int result; 151 152 /* check the interface type to see if it's one we care about */ 153 switch (ifn->if_type) { 154 case IFT_ETHER: 155 case IFT_ISO88023: 156 case IFT_ISO88024: 157 case IFT_ISO88025: 158 case IFT_ISO88026: 159 case IFT_STARLAN: 160 case IFT_P10: 161 case IFT_P80: 162 case IFT_HY: 163 case IFT_FDDI: 164 case IFT_XETHER: 165 case IFT_ISDNBASIC: 166 case IFT_ISDNPRIMARY: 167 case IFT_PTPSERIAL: 168 case IFT_OTHER: 169 case IFT_PPP: 170 case IFT_LOOP: 171 case IFT_SLIP: 172 case IFT_GIF: 173 case IFT_L2VLAN: 174 case IFT_STF: 175 case IFT_IP: 176 case IFT_IPOVERCDLC: 177 case IFT_IPOVERCLAW: 178 case IFT_PROPVIRTUAL: /* NetGraph Virtual too */ 179 case IFT_VIRTUALIPADDRESS: 180 result = 1; 181 break; 182 default: 183 result = 0; 184 } 185 186 return (result); 187} 188 189 190 191 192static void 193sctp_init_ifns_for_vrf(int vrfid) 194{ 195 /* 196 * Here we must apply ANY locks needed by the IFN we access and also 197 * make sure we lock any IFA that exists as we float through the 198 * list of IFA's 199 */ 200 struct ifnet *ifn; 201 struct ifaddr *ifa; 202 struct sctp_ifa *sctp_ifa; 203 uint32_t ifa_flags; 204 205#ifdef INET6 206 struct in6_ifaddr *ifa6; 207 208#endif 209 210 IFNET_RLOCK(); 211 TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) { 212 if (sctp_is_desired_interface_type(ifn) == 0) { 213 /* non desired type */ 214 continue; 215 } 216 IF_ADDR_RLOCK(ifn); 217 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { 218 if (ifa->ifa_addr == NULL) { 219 continue; 220 } 221 switch (ifa->ifa_addr->sa_family) { 222#ifdef INET 223 case AF_INET: 224 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) { 225 continue; 226 } 227 break; 228#endif 229#ifdef INET6 230 case AF_INET6: 231 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) { 232 /* skip unspecifed addresses */ 233 continue; 234 } 235 break; 236#endif 237 default: 238 continue; 239 } 240 switch (ifa->ifa_addr->sa_family) { 241#ifdef INET 242 case AF_INET: 243 ifa_flags = 0; 244 break; 245#endif 246#ifdef INET6 247 case AF_INET6: 248 ifa6 = (struct in6_ifaddr *)ifa; 249 ifa_flags = ifa6->ia6_flags; 250 break; 251#endif 252 default: 253 ifa_flags = 0; 254 break; 255 } 256 sctp_ifa = sctp_add_addr_to_vrf(vrfid, 257 (void *)ifn, 258 ifn->if_index, 259 ifn->if_type, 260 ifn->if_xname, 261 (void *)ifa, 262 ifa->ifa_addr, 263 ifa_flags, 264 0); 265 if (sctp_ifa) { 266 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE; 267 } 268 } 269 IF_ADDR_RUNLOCK(ifn); 270 } 271 IFNET_RUNLOCK(); 272} 273 274void 275sctp_init_vrf_list(int vrfid) 276{ 277 if (vrfid > SCTP_MAX_VRF_ID) 278 /* can't do that */ 279 return; 280 281 /* Don't care about return here */ 282 (void)sctp_allocate_vrf(vrfid); 283 284 /* 285 * Now we need to build all the ifn's for this vrf and there 286 * addresses 287 */ 288 sctp_init_ifns_for_vrf(vrfid); 289} 290 291void 292sctp_addr_change(struct ifaddr *ifa, int cmd) 293{ 294 uint32_t ifa_flags = 0; 295 296 if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) { 297 return; 298 } 299 /* 300 * BSD only has one VRF, if this changes we will need to hook in the 301 * right things here to get the id to pass to the address managment 302 * routine. 303 */ 304 if (SCTP_BASE_VAR(first_time) == 0) { 305 /* Special test to see if my ::1 will showup with this */ 306 SCTP_BASE_VAR(first_time) = 1; 307 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID); 308 } 309 if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) { 310 /* don't know what to do with this */ 311 return; 312 } 313 if (ifa->ifa_addr == NULL) { 314 return; 315 } 316 if (sctp_is_desired_interface_type(ifa->ifa_ifp) == 0) { 317 /* non desired type */ 318 return; 319 } 320 switch (ifa->ifa_addr->sa_family) { 321#ifdef INET 322 case AF_INET: 323 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) { 324 return; 325 } 326 break; 327#endif 328#ifdef INET6 329 case AF_INET6: 330 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags; 331 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) { 332 /* skip unspecifed addresses */ 333 return; 334 } 335 break; 336#endif 337 default: 338 /* non inet/inet6 skip */ 339 return; 340 } 341 if (cmd == RTM_ADD) { 342 (void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp, 343 ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, ifa->ifa_ifp->if_xname, 344 (void *)ifa, ifa->ifa_addr, ifa_flags, 1); 345 } else { 346 347 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr, 348 ifa->ifa_ifp->if_index, 349 ifa->ifa_ifp->if_xname); 350 351 /* 352 * We don't bump refcount here so when it completes the 353 * final delete will happen. 354 */ 355 } 356} 357 358void 359 sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){ 360 struct ifnet *ifn; 361 struct ifaddr *ifa; 362 363 IFNET_RLOCK(); 364 TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) { 365 if (!(*pred) (ifn)) { 366 continue; 367 } 368 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { 369 sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE); 370 } 371 } 372 IFNET_RUNLOCK(); 373} 374 375struct mbuf * 376sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header, 377 int how, int allonebuf, int type) 378{ 379 struct mbuf *m = NULL; 380 381 m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0); 382 if (m == NULL) { 383 /* bad, no memory */ 384 return (m); 385 } 386 if (allonebuf) { 387 int siz; 388 389 if (SCTP_BUF_IS_EXTENDED(m)) { 390 siz = SCTP_BUF_EXTEND_SIZE(m); 391 } else { 392 if (want_header) 393 siz = MHLEN; 394 else 395 siz = MLEN; 396 } 397 if (siz < space_needed) { 398 m_freem(m); 399 return (NULL); 400 } 401 } 402 if (SCTP_BUF_NEXT(m)) { 403 sctp_m_freem(SCTP_BUF_NEXT(m)); 404 SCTP_BUF_NEXT(m) = NULL; 405 } 406#ifdef SCTP_MBUF_LOGGING 407 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 408 sctp_log_mb(m, SCTP_MBUF_IALLOC); 409 } 410#endif 411 return (m); 412} 413 414 415#ifdef SCTP_PACKET_LOGGING 416void 417sctp_packet_log(struct mbuf *m) 418{ 419 int *lenat, thisone; 420 void *copyto; 421 uint32_t *tick_tock; 422 int length; 423 int total_len; 424 int grabbed_lock = 0; 425 int value, newval, thisend, thisbegin; 426 427 /* 428 * Buffer layout. -sizeof this entry (total_len) -previous end 429 * (value) -ticks of log (ticks) o -ip packet o -as logged - 430 * where this started (thisbegin) x <--end points here 431 */ 432 length = SCTP_HEADER_LEN(m); 433 total_len = SCTP_SIZE32((length + (4 * sizeof(int)))); 434 /* Log a packet to the buffer. */ 435 if (total_len > SCTP_PACKET_LOG_SIZE) { 436 /* Can't log this packet I have not a buffer big enough */ 437 return; 438 } 439 if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) { 440 return; 441 } 442 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1); 443try_again: 444 if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) { 445 SCTP_IP_PKTLOG_LOCK(); 446 grabbed_lock = 1; 447again_locked: 448 value = SCTP_BASE_VAR(packet_log_end); 449 newval = SCTP_BASE_VAR(packet_log_end) + total_len; 450 if (newval >= SCTP_PACKET_LOG_SIZE) { 451 /* we wrapped */ 452 thisbegin = 0; 453 thisend = total_len; 454 } else { 455 thisbegin = SCTP_BASE_VAR(packet_log_end); 456 thisend = newval; 457 } 458 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) { 459 goto again_locked; 460 } 461 } else { 462 value = SCTP_BASE_VAR(packet_log_end); 463 newval = SCTP_BASE_VAR(packet_log_end) + total_len; 464 if (newval >= SCTP_PACKET_LOG_SIZE) { 465 /* we wrapped */ 466 thisbegin = 0; 467 thisend = total_len; 468 } else { 469 thisbegin = SCTP_BASE_VAR(packet_log_end); 470 thisend = newval; 471 } 472 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) { 473 goto try_again; 474 } 475 } 476 /* Sanity check */ 477 if (thisend >= SCTP_PACKET_LOG_SIZE) { 478 SCTP_PRINTF("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n", 479 thisbegin, 480 thisend, 481 SCTP_BASE_VAR(packet_log_writers), 482 grabbed_lock, 483 SCTP_BASE_VAR(packet_log_end)); 484 SCTP_BASE_VAR(packet_log_end) = 0; 485 goto no_log; 486 487 } 488 lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin]; 489 *lenat = total_len; 490 lenat++; 491 *lenat = value; 492 lenat++; 493 tick_tock = (uint32_t *) lenat; 494 lenat++; 495 *tick_tock = sctp_get_tick_count(); 496 copyto = (void *)lenat; 497 thisone = thisend - sizeof(int); 498 lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone]; 499 *lenat = thisbegin; 500 if (grabbed_lock) { 501 SCTP_IP_PKTLOG_UNLOCK(); 502 grabbed_lock = 0; 503 } 504 m_copydata(m, 0, length, (caddr_t)copyto); 505no_log: 506 if (grabbed_lock) { 507 SCTP_IP_PKTLOG_UNLOCK(); 508 } 509 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1); 510} 511 512 513int 514sctp_copy_out_packet_log(uint8_t * target, int length) 515{ 516 /* 517 * We wind through the packet log starting at start copying up to 518 * length bytes out. We return the number of bytes copied. 519 */ 520 int tocopy, this_copy; 521 int *lenat; 522 int did_delay = 0; 523 524 tocopy = length; 525 if (length < (int)(2 * sizeof(int))) { 526 /* not enough room */ 527 return (0); 528 } 529 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) { 530 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK); 531again: 532 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) { 533 /* 534 * we delay here for just a moment hoping the 535 * writer(s) that were present when we entered will 536 * have left and we only have locking ones that will 537 * contend with us for the lock. This does not 538 * assure 100% access, but its good enough for a 539 * logging facility like this. 540 */ 541 did_delay = 1; 542 DELAY(10); 543 goto again; 544 } 545 } 546 SCTP_IP_PKTLOG_LOCK(); 547 lenat = (int *)target; 548 *lenat = SCTP_BASE_VAR(packet_log_end); 549 lenat++; 550 this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE); 551 memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy); 552 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) { 553 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 554 SCTP_PKTLOG_WRITERS_NEED_LOCK); 555 } 556 SCTP_IP_PKTLOG_UNLOCK(); 557 return (this_copy + sizeof(int)); 558} 559 560#endif 561