1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $ */ 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 53 /* Note to Michael/Peter for mac-os, 54 * I think mac has this too since I 55 * do see the M_PCB type, so I 56 * will also put in the mac file the 57 * MALLOC_DECLARE. If this does not 58 * work for mac uncomment the defines for 59 * the strings that we use in Panda, I put 60 * them in comments in the mac-os file. 61 */ 62 MALLOC_DEFINE(SCTP_M_MAP, "sctp_map", "sctp asoc map descriptor"); 63 MALLOC_DEFINE(SCTP_M_STRMI, "sctp_stri", "sctp stream in array"); 64 MALLOC_DEFINE(SCTP_M_STRMO, "sctp_stro", "sctp stream out array"); 65 MALLOC_DEFINE(SCTP_M_ASC_ADDR, "sctp_aadr", "sctp asconf address"); 66 MALLOC_DEFINE(SCTP_M_ASC_IT, "sctp_a_it", "sctp asconf iterator"); 67 MALLOC_DEFINE(SCTP_M_AUTH_CL, "sctp_atcl", "sctp auth chunklist"); 68 MALLOC_DEFINE(SCTP_M_AUTH_KY, "sctp_atky", "sctp auth key"); 69 MALLOC_DEFINE(SCTP_M_AUTH_HL, "sctp_athm", "sctp auth hmac list"); 70 MALLOC_DEFINE(SCTP_M_AUTH_IF, "sctp_athi", "sctp auth info"); 71 MALLOC_DEFINE(SCTP_M_STRESET, "sctp_stre", "sctp stream reset"); 72 MALLOC_DEFINE(SCTP_M_CMSG, "sctp_cmsg", "sctp CMSG buffer"); 73 MALLOC_DEFINE(SCTP_M_COPYAL, "sctp_cpal", "sctp copy all"); 74 MALLOC_DEFINE(SCTP_M_VRF, "sctp_vrf", "sctp vrf struct"); 75 MALLOC_DEFINE(SCTP_M_IFA, "sctp_ifa", "sctp ifa struct"); 76 MALLOC_DEFINE(SCTP_M_IFN, "sctp_ifn", "sctp ifn struct"); 77 MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block"); 78 MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list"); 79 MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control"); 80 MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option"); 81 82 #if defined(SCTP_USE_THREAD_BASED_ITERATOR) 83 void 84 sctp_wakeup_iterator(void) 85 { 86 wakeup(&SCTP_BASE_INFO(iterator_running)); 87 } 88 89 static void 90 sctp_iterator_thread(void *v) 91 { 92 SCTP_IPI_ITERATOR_WQ_LOCK(); 93 SCTP_BASE_INFO(iterator_running) = 0; 94 while (1) { 95 msleep(&SCTP_BASE_INFO(iterator_running), 96 &SCTP_BASE_INFO(ipi_iterator_wq_mtx), 97 0, "waiting_for_work", 0); 98 if (SCTP_BASE_INFO(threads_must_exit)) { 99 kthread_exit(); 100 } 101 sctp_iterator_worker(); 102 } 103 } 104 105 void 106 sctp_startup_iterator(void) 107 { 108 int ret; 109 110 ret = kproc_create(sctp_iterator_thread, 111 (void *)NULL, 112 &SCTP_BASE_INFO(thread_proc), 113 RFPROC, 114 SCTP_KTHREAD_PAGES, 115 SCTP_KTRHEAD_NAME); 116 } 117 118 #endif 119 120 #ifdef INET6 121 122 void 123 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa) 124 { 125 struct in6_ifaddr *ifa6; 126 127 ifa6 = (struct in6_ifaddr *)ifa->ifa; 128 ifa->flags = ifa6->ia6_flags; 129 if (!MODULE_GLOBAL(MOD_INET6, ip6_use_deprecated)) { 130 if (ifa->flags & 131 IN6_IFF_DEPRECATED) { 132 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE; 133 } else { 134 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 135 } 136 } else { 137 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 138 } 139 if (ifa->flags & 140 (IN6_IFF_DETACHED | 141 IN6_IFF_ANYCAST | 142 IN6_IFF_NOTREADY)) { 143 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE; 144 } else { 145 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 146 } 147 } 148 149 #endif /* INET6 */ 150 151 152 static uint32_t 153 sctp_is_desired_interface_type(struct ifaddr *ifa) 154 { 155 int result; 156 157 /* check the interface type to see if it's one we care about */ 158 switch (ifa->ifa_ifp->if_type) { 159 case IFT_ETHER: 160 case IFT_ISO88023: 161 case IFT_ISO88024: 162 case IFT_ISO88025: 163 case IFT_ISO88026: 164 case IFT_STARLAN: 165 case IFT_P10: 166 case IFT_P80: 167 case IFT_HY: 168 case IFT_FDDI: 169 case IFT_XETHER: 170 case IFT_ISDNBASIC: 171 case IFT_ISDNPRIMARY: 172 case IFT_PTPSERIAL: 173 case IFT_OTHER: 174 case IFT_PPP: 175 case IFT_LOOP: 176 case IFT_SLIP: 177 case IFT_GIF: 178 case IFT_IP: 179 case IFT_IPOVERCDLC: 180 case IFT_IPOVERCLAW: 181 case IFT_VIRTUALIPADDRESS: 182 result = 1; 183 break; 184 default: 185 result = 0; 186 } 187 188 return (result); 189 } 190 191 192 static void 193 sctp_init_ifns_for_vrf(int vrfid) 194 { 195 196 197 /* 198 * Here we must apply ANY locks needed by the IFN we access and also 199 * make sure we lock any IFA that exists as we float through the 200 * list of IFA's 201 */ 202 struct ifnet *ifn; 203 struct ifaddr *ifa; 204 struct in6_ifaddr *ifa6; 205 struct sctp_ifa *sctp_ifa; 206 uint32_t ifa_flags; 207 208 TAILQ_FOREACH(ifn, &MODULE_GLOBAL(MOD_NET, ifnet), if_list) { 209 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { 210 211 if (ifa->ifa_addr == NULL) { 212 continue; 213 } 214 if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) { 215 /* non inet/inet6 skip */ 216 continue; 217 } 218 if (ifa->ifa_addr->sa_family == AF_INET6) { 219 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) { 220 /* skip unspecifed addresses */ 221 continue; 222 } 223 } else { 224 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) { 225 continue; 226 } 227 } 228 if (sctp_is_desired_interface_type(ifa) == 0) { 229 /* non desired type */ 230 continue; 231 } 232 if (ifa->ifa_addr->sa_family == AF_INET6) { 233 ifa6 = (struct in6_ifaddr *)ifa; 234 ifa_flags = ifa6->ia6_flags; 235 } else { 236 ifa_flags = 0; 237 } 238 sctp_ifa = sctp_add_addr_to_vrf(vrfid, 239 (void *)ifn, 240 ifn->if_index, 241 ifn->if_type, 242 ifn->if_xname, 243 (void *)ifa, 244 ifa->ifa_addr, 245 ifa_flags, 246 0); 247 if (sctp_ifa) { 248 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE; 249 } 250 } 251 } 252 } 253 254 255 void 256 sctp_init_vrf_list(int vrfid) 257 { 258 if (vrfid > SCTP_MAX_VRF_ID) 259 /* can't do that */ 260 return; 261 262 /* Don't care about return here */ 263 (void)sctp_allocate_vrf(vrfid); 264 265 /* 266 * Now we need to build all the ifn's for this vrf and there 267 * addresses 268 */ 269 sctp_init_ifns_for_vrf(vrfid); 270 } 271 272 void 273 sctp_addr_change(struct ifaddr *ifa, int cmd) 274 { 275 struct sctp_ifa *ifap = NULL; 276 uint32_t ifa_flags = 0; 277 278 /* 279 * BSD only has one VRF, if this changes we will need to hook in the 280 * right things here to get the id to pass to the address managment 281 * routine. 282 */ 283 if (SCTP_BASE_VAR(first_time) == 0) { 284 /* Special test to see if my ::1 will showup with this */ 285 SCTP_BASE_VAR(first_time) = 1; 286 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID); 287 } 288 if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) { 289 /* don't know what to do with this */ 290 return; 291 } 292 if (ifa->ifa_addr == NULL) { 293 return; 294 } 295 if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) { 296 /* non inet/inet6 skip */ 297 return; 298 } 299 if (ifa->ifa_addr->sa_family == AF_INET6) { 300 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags; 301 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) { 302 /* skip unspecifed addresses */ 303 return; 304 } 305 } else { 306 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) { 307 return; 308 } 309 } 310 311 if (sctp_is_desired_interface_type(ifa) == 0) { 312 /* non desired type */ 313 return; 314 } 315 if (cmd == RTM_ADD) { 316 ifap = sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp, 317 ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, 318 ifa->ifa_ifp->if_xname, 319 (void *)ifa, ifa->ifa_addr, ifa_flags, 1); 320 } else { 321 322 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr, 323 ifa->ifa_ifp->if_index, 324 ifa->ifa_ifp->if_xname 325 ); 326 /* 327 * We don't bump refcount here so when it completes the 328 * final delete will happen. 329 */ 330 } 331 } 332 333 void 334 sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){ 335 struct ifnet *ifn; 336 struct ifaddr *ifa; 337 338 TAILQ_FOREACH(ifn, &MODULE_GLOBAL(MOD_NET, ifnet), if_list) { 339 if (!(*pred) (ifn)) { 340 continue; 341 } 342 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { 343 sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE); 344 } 345 } 346 } 347 348 struct mbuf * 349 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header, 350 int how, int allonebuf, int type) 351 { 352 struct mbuf *m = NULL; 353 354 m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0); 355 if (m == NULL) { 356 /* bad, no memory */ 357 return (m); 358 } 359 if (allonebuf) { 360 int siz; 361 362 if (SCTP_BUF_IS_EXTENDED(m)) { 363 siz = SCTP_BUF_EXTEND_SIZE(m); 364 } else { 365 if (want_header) 366 siz = MHLEN; 367 else 368 siz = MLEN; 369 } 370 if (siz < space_needed) { 371 m_freem(m); 372 return (NULL); 373 } 374 } 375 if (SCTP_BUF_NEXT(m)) { 376 sctp_m_freem(SCTP_BUF_NEXT(m)); 377 SCTP_BUF_NEXT(m) = NULL; 378 } 379 #ifdef SCTP_MBUF_LOGGING 380 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 381 if (SCTP_BUF_IS_EXTENDED(m)) { 382 sctp_log_mb(m, SCTP_MBUF_IALLOC); 383 } 384 } 385 #endif 386 return (m); 387 } 388 389 390 #ifdef SCTP_PACKET_LOGGING 391 void 392 sctp_packet_log(struct mbuf *m, int length) 393 { 394 int *lenat, thisone; 395 void *copyto; 396 uint32_t *tick_tock; 397 int total_len; 398 int grabbed_lock = 0; 399 int value, newval, thisend, thisbegin; 400 401 /* 402 * Buffer layout. -sizeof this entry (total_len) -previous end 403 * (value) -ticks of log (ticks) o -ip packet o -as logged - 404 * where this started (thisbegin) x <--end points here 405 */ 406 total_len = SCTP_SIZE32((length + (4 * sizeof(int)))); 407 /* Log a packet to the buffer. */ 408 if (total_len > SCTP_PACKET_LOG_SIZE) { 409 /* Can't log this packet I have not a buffer big enough */ 410 return; 411 } 412 if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) { 413 return; 414 } 415 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1); 416 try_again: 417 if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) { 418 SCTP_IP_PKTLOG_LOCK(); 419 grabbed_lock = 1; 420 again_locked: 421 value = SCTP_BASE_VAR(packet_log_end); 422 newval = SCTP_BASE_VAR(packet_log_end) + total_len; 423 if (newval >= SCTP_PACKET_LOG_SIZE) { 424 /* we wrapped */ 425 thisbegin = 0; 426 thisend = total_len; 427 } else { 428 thisbegin = SCTP_BASE_VAR(packet_log_end); 429 thisend = newval; 430 } 431 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) { 432 goto again_locked; 433 } 434 } else { 435 value = SCTP_BASE_VAR(packet_log_end); 436 newval = SCTP_BASE_VAR(packet_log_end) + total_len; 437 if (newval >= SCTP_PACKET_LOG_SIZE) { 438 /* we wrapped */ 439 thisbegin = 0; 440 thisend = total_len; 441 } else { 442 thisbegin = SCTP_BASE_VAR(packet_log_end); 443 thisend = newval; 444 } 445 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) { 446 goto try_again; 447 } 448 } 449 /* Sanity check */ 450 if (thisend >= SCTP_PACKET_LOG_SIZE) { 451 printf("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n", 452 thisbegin, 453 thisend, 454 SCTP_BASE_VAR(packet_log_writers), 455 grabbed_lock, 456 SCTP_BASE_VAR(packet_log_end)); 457 SCTP_BASE_VAR(packet_log_end) = 0; 458 goto no_log; 459 460 } 461 lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin]; 462 *lenat = total_len; 463 lenat++; 464 *lenat = value; 465 lenat++; 466 tick_tock = (uint32_t *) lenat; 467 lenat++; 468 *tick_tock = sctp_get_tick_count(); 469 copyto = (void *)lenat; 470 thisone = thisend - sizeof(int); 471 lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone]; 472 *lenat = thisbegin; 473 if (grabbed_lock) { 474 SCTP_IP_PKTLOG_UNLOCK(); 475 grabbed_lock = 0; 476 } 477 m_copydata(m, 0, length, (caddr_t)copyto); 478 no_log: 479 if (grabbed_lock) { 480 SCTP_IP_PKTLOG_UNLOCK(); 481 } 482 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1); 483 } 484 485 486 int 487 sctp_copy_out_packet_log(uint8_t * target, int length) 488 { 489 /* 490 * We wind through the packet log starting at start copying up to 491 * length bytes out. We return the number of bytes copied. 492 */ 493 int tocopy, this_copy; 494 int *lenat; 495 int did_delay = 0; 496 497 tocopy = length; 498 if (length < (int)(2 * sizeof(int))) { 499 /* not enough room */ 500 return (0); 501 } 502 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) { 503 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK); 504 again: 505 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) { 506 /* 507 * we delay here for just a moment hoping the 508 * writer(s) that were present when we entered will 509 * have left and we only have locking ones that will 510 * contend with us for the lock. This does not 511 * assure 100% access, but its good enough for a 512 * logging facility like this. 513 */ 514 did_delay = 1; 515 DELAY(10); 516 goto again; 517 } 518 } 519 SCTP_IP_PKTLOG_LOCK(); 520 lenat = (int *)target; 521 *lenat = SCTP_BASE_VAR(packet_log_end); 522 lenat++; 523 this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE); 524 memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy); 525 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) { 526 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 527 SCTP_PKTLOG_WRITERS_NEED_LOCK); 528 } 529 SCTP_IP_PKTLOG_UNLOCK(); 530 return (this_copy + sizeof(int)); 531 } 532 533 #endif 534