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