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