sctp_bsd_addr.c revision 197328
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: head/sys/netinet/sctp_bsd_addr.c 197328 2009-09-19 14:55:12Z 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 */ 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 */ 62MALLOC_DEFINE(SCTP_M_MAP, "sctp_map", "sctp asoc map descriptor"); 63MALLOC_DEFINE(SCTP_M_STRMI, "sctp_stri", "sctp stream in array"); 64MALLOC_DEFINE(SCTP_M_STRMO, "sctp_stro", "sctp stream out array"); 65MALLOC_DEFINE(SCTP_M_ASC_ADDR, "sctp_aadr", "sctp asconf address"); 66MALLOC_DEFINE(SCTP_M_ASC_IT, "sctp_a_it", "sctp asconf iterator"); 67MALLOC_DEFINE(SCTP_M_AUTH_CL, "sctp_atcl", "sctp auth chunklist"); 68MALLOC_DEFINE(SCTP_M_AUTH_KY, "sctp_atky", "sctp auth key"); 69MALLOC_DEFINE(SCTP_M_AUTH_HL, "sctp_athm", "sctp auth hmac list"); 70MALLOC_DEFINE(SCTP_M_AUTH_IF, "sctp_athi", "sctp auth info"); 71MALLOC_DEFINE(SCTP_M_STRESET, "sctp_stre", "sctp stream reset"); 72MALLOC_DEFINE(SCTP_M_CMSG, "sctp_cmsg", "sctp CMSG buffer"); 73MALLOC_DEFINE(SCTP_M_COPYAL, "sctp_cpal", "sctp copy all"); 74MALLOC_DEFINE(SCTP_M_VRF, "sctp_vrf", "sctp vrf struct"); 75MALLOC_DEFINE(SCTP_M_IFA, "sctp_ifa", "sctp ifa struct"); 76MALLOC_DEFINE(SCTP_M_IFN, "sctp_ifn", "sctp ifn struct"); 77MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block"); 78MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list"); 79MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control"); 80MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option"); 81 82#if defined(SCTP_USE_THREAD_BASED_ITERATOR) 83void 84sctp_wakeup_iterator(void) 85{ 86 wakeup(&SCTP_BASE_INFO(iterator_running)); 87} 88 89static void 90sctp_iterator_thread(void *v) 91{ 92 CURVNET_SET((struct vnet *)v); 93 SCTP_IPI_ITERATOR_WQ_LOCK(); 94 SCTP_BASE_INFO(iterator_running) = 0; 95 while (1) { 96 msleep(&SCTP_BASE_INFO(iterator_running), 97 &SCTP_BASE_INFO(ipi_iterator_wq_mtx), 98 0, "waiting_for_work", 0); 99 if (SCTP_BASE_INFO(threads_must_exit)) { 100 kthread_exit(); 101 } 102 sctp_iterator_worker(); 103 } 104 CURVNET_RESTORE(); 105} 106 107void 108sctp_startup_iterator(void) 109{ 110 int ret; 111 112 ret = kproc_create(sctp_iterator_thread, 113 (void *)curvnet, 114 &SCTP_BASE_INFO(thread_proc), 115 RFPROC, 116 SCTP_KTHREAD_PAGES, 117 SCTP_KTRHEAD_NAME); 118} 119 120#endif 121 122#ifdef INET6 123 124void 125sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa) 126{ 127 struct in6_ifaddr *ifa6; 128 129 ifa6 = (struct in6_ifaddr *)ifa->ifa; 130 ifa->flags = ifa6->ia6_flags; 131 if (!MODULE_GLOBAL(ip6_use_deprecated)) { 132 if (ifa->flags & 133 IN6_IFF_DEPRECATED) { 134 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE; 135 } else { 136 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 137 } 138 } else { 139 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 140 } 141 if (ifa->flags & 142 (IN6_IFF_DETACHED | 143 IN6_IFF_ANYCAST | 144 IN6_IFF_NOTREADY)) { 145 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE; 146 } else { 147 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE; 148 } 149} 150 151#endif /* INET6 */ 152 153 154static uint32_t 155sctp_is_desired_interface_type(struct ifaddr *ifa) 156{ 157 int result; 158 159 /* check the interface type to see if it's one we care about */ 160 switch (ifa->ifa_ifp->if_type) { 161 case IFT_ETHER: 162 case IFT_ISO88023: 163 case IFT_ISO88024: 164 case IFT_ISO88025: 165 case IFT_ISO88026: 166 case IFT_STARLAN: 167 case IFT_P10: 168 case IFT_P80: 169 case IFT_HY: 170 case IFT_FDDI: 171 case IFT_XETHER: 172 case IFT_ISDNBASIC: 173 case IFT_ISDNPRIMARY: 174 case IFT_PTPSERIAL: 175 case IFT_OTHER: 176 case IFT_PPP: 177 case IFT_LOOP: 178 case IFT_SLIP: 179 case IFT_GIF: 180 case IFT_L2VLAN: 181 case IFT_IP: 182 case IFT_IPOVERCDLC: 183 case IFT_IPOVERCLAW: 184 case IFT_VIRTUALIPADDRESS: 185 result = 1; 186 break; 187 default: 188 result = 0; 189 } 190 191 return (result); 192} 193 194 195 196 197static void 198sctp_init_ifns_for_vrf(int vrfid) 199{ 200 /* 201 * Here we must apply ANY locks needed by the IFN we access and also 202 * make sure we lock any IFA that exists as we float through the 203 * list of IFA's 204 */ 205 struct ifnet *ifn; 206 struct ifaddr *ifa; 207 struct in6_ifaddr *ifa6; 208 struct sctp_ifa *sctp_ifa; 209 uint32_t ifa_flags; 210 211 IFNET_RLOCK(); 212 TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) { 213 IF_ADDR_LOCK(ifn); 214 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { 215 if (ifa->ifa_addr == NULL) { 216 continue; 217 } 218 if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) { 219 /* non inet/inet6 skip */ 220 continue; 221 } 222 if (ifa->ifa_addr->sa_family == AF_INET6) { 223 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) { 224 /* skip unspecifed addresses */ 225 continue; 226 } 227 } else { 228 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) { 229 continue; 230 } 231 } 232 if (sctp_is_desired_interface_type(ifa) == 0) { 233 /* non desired type */ 234 continue; 235 } 236 if (ifa->ifa_addr->sa_family == AF_INET6) { 237 ifa6 = (struct in6_ifaddr *)ifa; 238 ifa_flags = ifa6->ia6_flags; 239 } else { 240 ifa_flags = 0; 241 } 242 sctp_ifa = sctp_add_addr_to_vrf(vrfid, 243 (void *)ifn, 244 ifn->if_index, 245 ifn->if_type, 246 ifn->if_xname, 247 (void *)ifa, 248 ifa->ifa_addr, 249 ifa_flags, 250 0); 251 if (sctp_ifa) { 252 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE; 253 } 254 } 255 IF_ADDR_UNLOCK(ifn); 256 } 257 IFNET_RUNLOCK(); 258} 259 260void 261sctp_init_vrf_list(int vrfid) 262{ 263 if (vrfid > SCTP_MAX_VRF_ID) 264 /* can't do that */ 265 return; 266 267 /* Don't care about return here */ 268 (void)sctp_allocate_vrf(vrfid); 269 270 /* 271 * Now we need to build all the ifn's for this vrf and there 272 * addresses 273 */ 274 sctp_init_ifns_for_vrf(vrfid); 275} 276 277void 278sctp_addr_change(struct ifaddr *ifa, int cmd) 279{ 280 struct sctp_ifa *ifap = NULL; 281 uint32_t ifa_flags = 0; 282 283 /* 284 * BSD only has one VRF, if this changes we will need to hook in the 285 * right things here to get the id to pass to the address managment 286 * routine. 287 */ 288 if (SCTP_BASE_VAR(first_time) == 0) { 289 /* Special test to see if my ::1 will showup with this */ 290 SCTP_BASE_VAR(first_time) = 1; 291 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID); 292 } 293 if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) { 294 /* don't know what to do with this */ 295 return; 296 } 297 if (ifa->ifa_addr == NULL) { 298 return; 299 } 300 if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) { 301 /* non inet/inet6 skip */ 302 return; 303 } 304 if (ifa->ifa_addr->sa_family == AF_INET6) { 305 ifa_flags = ((struct in6_ifaddr *)ifa)->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 { 311 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) { 312 return; 313 } 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 { 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 338void 339 sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){ 340 struct ifnet *ifn; 341 struct ifaddr *ifa; 342 343 IFNET_RLOCK(); 344 TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) { 345 if (!(*pred) (ifn)) { 346 continue; 347 } 348 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { 349 sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE); 350 } 351 } 352 IFNET_RUNLOCK(); 353} 354 355struct mbuf * 356sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header, 357 int how, int allonebuf, int type) 358{ 359 struct mbuf *m = NULL; 360 361 m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0); 362 if (m == NULL) { 363 /* bad, no memory */ 364 return (m); 365 } 366 if (allonebuf) { 367 int siz; 368 369 if (SCTP_BUF_IS_EXTENDED(m)) { 370 siz = SCTP_BUF_EXTEND_SIZE(m); 371 } else { 372 if (want_header) 373 siz = MHLEN; 374 else 375 siz = MLEN; 376 } 377 if (siz < space_needed) { 378 m_freem(m); 379 return (NULL); 380 } 381 } 382 if (SCTP_BUF_NEXT(m)) { 383 sctp_m_freem(SCTP_BUF_NEXT(m)); 384 SCTP_BUF_NEXT(m) = NULL; 385 } 386#ifdef SCTP_MBUF_LOGGING 387 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 388 if (SCTP_BUF_IS_EXTENDED(m)) { 389 sctp_log_mb(m, SCTP_MBUF_IALLOC); 390 } 391 } 392#endif 393 return (m); 394} 395 396 397#ifdef SCTP_PACKET_LOGGING 398void 399sctp_packet_log(struct mbuf *m, int length) 400{ 401 int *lenat, thisone; 402 void *copyto; 403 uint32_t *tick_tock; 404 int total_len; 405 int grabbed_lock = 0; 406 int value, newval, thisend, thisbegin; 407 408 /* 409 * Buffer layout. -sizeof this entry (total_len) -previous end 410 * (value) -ticks of log (ticks) o -ip packet o -as logged - 411 * where this started (thisbegin) x <--end points here 412 */ 413 total_len = SCTP_SIZE32((length + (4 * sizeof(int)))); 414 /* Log a packet to the buffer. */ 415 if (total_len > SCTP_PACKET_LOG_SIZE) { 416 /* Can't log this packet I have not a buffer big enough */ 417 return; 418 } 419 if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) { 420 return; 421 } 422 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1); 423try_again: 424 if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) { 425 SCTP_IP_PKTLOG_LOCK(); 426 grabbed_lock = 1; 427again_locked: 428 value = SCTP_BASE_VAR(packet_log_end); 429 newval = SCTP_BASE_VAR(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 = SCTP_BASE_VAR(packet_log_end); 436 thisend = newval; 437 } 438 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) { 439 goto again_locked; 440 } 441 } else { 442 value = SCTP_BASE_VAR(packet_log_end); 443 newval = SCTP_BASE_VAR(packet_log_end) + total_len; 444 if (newval >= SCTP_PACKET_LOG_SIZE) { 445 /* we wrapped */ 446 thisbegin = 0; 447 thisend = total_len; 448 } else { 449 thisbegin = SCTP_BASE_VAR(packet_log_end); 450 thisend = newval; 451 } 452 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) { 453 goto try_again; 454 } 455 } 456 /* Sanity check */ 457 if (thisend >= SCTP_PACKET_LOG_SIZE) { 458 printf("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n", 459 thisbegin, 460 thisend, 461 SCTP_BASE_VAR(packet_log_writers), 462 grabbed_lock, 463 SCTP_BASE_VAR(packet_log_end)); 464 SCTP_BASE_VAR(packet_log_end) = 0; 465 goto no_log; 466 467 } 468 lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin]; 469 *lenat = total_len; 470 lenat++; 471 *lenat = value; 472 lenat++; 473 tick_tock = (uint32_t *) lenat; 474 lenat++; 475 *tick_tock = sctp_get_tick_count(); 476 copyto = (void *)lenat; 477 thisone = thisend - sizeof(int); 478 lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone]; 479 *lenat = thisbegin; 480 if (grabbed_lock) { 481 SCTP_IP_PKTLOG_UNLOCK(); 482 grabbed_lock = 0; 483 } 484 m_copydata(m, 0, length, (caddr_t)copyto); 485no_log: 486 if (grabbed_lock) { 487 SCTP_IP_PKTLOG_UNLOCK(); 488 } 489 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1); 490} 491 492 493int 494sctp_copy_out_packet_log(uint8_t * target, int length) 495{ 496 /* 497 * We wind through the packet log starting at start copying up to 498 * length bytes out. We return the number of bytes copied. 499 */ 500 int tocopy, this_copy; 501 int *lenat; 502 int did_delay = 0; 503 504 tocopy = length; 505 if (length < (int)(2 * sizeof(int))) { 506 /* not enough room */ 507 return (0); 508 } 509 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) { 510 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK); 511again: 512 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) { 513 /* 514 * we delay here for just a moment hoping the 515 * writer(s) that were present when we entered will 516 * have left and we only have locking ones that will 517 * contend with us for the lock. This does not 518 * assure 100% access, but its good enough for a 519 * logging facility like this. 520 */ 521 did_delay = 1; 522 DELAY(10); 523 goto again; 524 } 525 } 526 SCTP_IP_PKTLOG_LOCK(); 527 lenat = (int *)target; 528 *lenat = SCTP_BASE_VAR(packet_log_end); 529 lenat++; 530 this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE); 531 memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy); 532 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) { 533 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 534 SCTP_PKTLOG_WRITERS_NEED_LOCK); 535 } 536 SCTP_IP_PKTLOG_UNLOCK(); 537 return (this_copy + sizeof(int)); 538} 539 540#endif 541