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