1 /*- 2 * Copyright (c) 2006-2007, 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 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 #ifndef __sctp_os_bsd_h__ 33 #define __sctp_os_bsd_h__ 34 /* 35 * includes 36 */ 37 #include "opt_ipsec.h" 38 #include "opt_compat.h" 39 #include "opt_inet6.h" 40 #include "opt_inet.h" 41 #include "opt_sctp.h" 42 43 #include <sys/param.h> 44 #include <sys/ktr.h> 45 #include <sys/systm.h> 46 #include <sys/malloc.h> 47 #include <sys/kernel.h> 48 #include <sys/sysctl.h> 49 #include <sys/mbuf.h> 50 #include <sys/protosw.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/jail.h> 54 #include <sys/sysctl.h> 55 #include <sys/resourcevar.h> 56 #include <sys/uio.h> 57 #include <sys/lock.h> 58 #include <sys/rwlock.h> 59 #include <sys/kthread.h> 60 #include <sys/priv.h> 61 #include <sys/random.h> 62 #include <sys/limits.h> 63 #include <sys/queue.h> 64 #include <sys/vimage.h> 65 #include <machine/cpu.h> 66 67 #include <net/if.h> 68 #include <net/if_types.h> 69 #include <net/if_var.h> 70 #include <net/route.h> 71 #include <net/vnet.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/ip.h> 76 #include <netinet/in_pcb.h> 77 #include <netinet/in_var.h> 78 #include <netinet/ip_var.h> 79 #include <netinet/ip_icmp.h> 80 #include <netinet/icmp_var.h> 81 #include <netinet/vinet.h> 82 83 #ifdef IPSEC 84 #include <netipsec/ipsec.h> 85 #include <netipsec/key.h> 86 #endif /* IPSEC */ 87 88 #ifdef INET6 89 #include <sys/domain.h> 90 #ifdef IPSEC 91 #include <netipsec/ipsec6.h> 92 #endif 93 #include <netinet/ip6.h> 94 #include <netinet6/ip6_var.h> 95 #include <netinet6/in6_pcb.h> 96 #include <netinet/icmp6.h> 97 #include <netinet6/ip6protosw.h> 98 #include <netinet6/nd6.h> 99 #include <netinet6/scope6_var.h> 100 #include <netinet6/vinet6.h> 101 #endif /* INET6 */ 102 103 104 #include <netinet/ip_options.h> 105 106 #ifndef in6pcb 107 #define in6pcb inpcb 108 #endif 109 /* Declare all the malloc names for all the various mallocs */ 110 MALLOC_DECLARE(SCTP_M_MAP); 111 MALLOC_DECLARE(SCTP_M_STRMI); 112 MALLOC_DECLARE(SCTP_M_STRMO); 113 MALLOC_DECLARE(SCTP_M_ASC_ADDR); 114 MALLOC_DECLARE(SCTP_M_ASC_IT); 115 MALLOC_DECLARE(SCTP_M_AUTH_CL); 116 MALLOC_DECLARE(SCTP_M_AUTH_KY); 117 MALLOC_DECLARE(SCTP_M_AUTH_HL); 118 MALLOC_DECLARE(SCTP_M_AUTH_IF); 119 MALLOC_DECLARE(SCTP_M_STRESET); 120 MALLOC_DECLARE(SCTP_M_CMSG); 121 MALLOC_DECLARE(SCTP_M_COPYAL); 122 MALLOC_DECLARE(SCTP_M_VRF); 123 MALLOC_DECLARE(SCTP_M_IFA); 124 MALLOC_DECLARE(SCTP_M_IFN); 125 MALLOC_DECLARE(SCTP_M_TIMW); 126 MALLOC_DECLARE(SCTP_M_MVRF); 127 MALLOC_DECLARE(SCTP_M_ITER); 128 MALLOC_DECLARE(SCTP_M_SOCKOPT); 129 130 #if defined(SCTP_LOCAL_TRACE_BUF) 131 132 #define SCTP_GET_CYCLECOUNT get_cyclecount() 133 #define SCTP_CTR6 sctp_log_trace 134 135 #else 136 #define SCTP_CTR6 CTR6 137 #endif 138 139 #define SCTP_BASE_INFO(__m) system_base_info.sctppcbinfo.__m 140 #define SCTP_BASE_STATS system_base_info.sctpstat 141 #define SCTP_BASE_STAT(__m) system_base_info.sctpstat.__m 142 #define SCTP_BASE_SYSCTL(__m) system_base_info.sctpsysctl.__m 143 #define SCTP_BASE_VAR(__m) system_base_info.__m 144 145 /* 146 * Macros to expand out globals defined by various modules 147 * to either a real global or a virtualized instance of one, 148 * depending on whether VIMAGE is defined. 149 */ 150 /* first define modules that supply us information */ 151 #define MOD_NET net 152 #define MOD_INET inet 153 #define MOD_INET6 inet6 154 #define MOD_IPSEC ipsec 155 156 /* then define the macro(s) that hook into the vimage macros */ 157 #if defined(__FreeBSD__) && __FreeBSD_version >= 800056 158 #define MODULE_GLOBAL(__MODULE, __SYMBOL) V_ ## __SYMBOL 159 #else 160 #define MODULE_GLOBAL(__MODULE, __SYMBOL) (__SYMBOL) 161 #endif 162 /* 163 * 164 */ 165 #define USER_ADDR_NULL (NULL) /* FIX ME: temp */ 166 #define SCTP_LIST_EMPTY(list) LIST_EMPTY(list) 167 168 #if defined(SCTP_DEBUG) 169 #define SCTPDBG(level, params...) \ 170 { \ 171 do { \ 172 if (SCTP_BASE_SYSCTL(sctp_debug_on) & level ) { \ 173 printf(params); \ 174 } \ 175 } while (0); \ 176 } 177 #define SCTPDBG_ADDR(level, addr) \ 178 { \ 179 do { \ 180 if (SCTP_BASE_SYSCTL(sctp_debug_on) & level ) { \ 181 sctp_print_address(addr); \ 182 } \ 183 } while (0); \ 184 } 185 #define SCTPDBG_PKT(level, iph, sh) \ 186 { \ 187 do { \ 188 if (SCTP_BASE_SYSCTL(sctp_debug_on) & level) { \ 189 sctp_print_address_pkt(iph, sh); \ 190 } \ 191 } while (0); \ 192 } 193 #else 194 #define SCTPDBG(level, params...) 195 #define SCTPDBG_ADDR(level, addr) 196 #define SCTPDBG_PKT(level, iph, sh) 197 #endif 198 #define SCTP_PRINTF(params...) printf(params) 199 200 #ifdef SCTP_LTRACE_CHUNKS 201 #define SCTP_LTRACE_CHK(a, b, c, d) if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LTRACE_CHUNK_ENABLE) CTR6(KTR_SUBSYS, "SCTP:%d[%d]:%x-%x-%x-%x", SCTP_LOG_CHUNK_PROC, 0, a, b, c, d) 202 #else 203 #define SCTP_LTRACE_CHK(a, b, c, d) 204 #endif 205 206 #ifdef SCTP_LTRACE_ERRORS 207 #define SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, file, err) if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LTRACE_ERROR_ENABLE) \ 208 printf("mbuf:%p inp:%p stcb:%p net:%p file:%x line:%d error:%d\n", \ 209 m, inp, stcb, net, file, __LINE__, err); 210 #define SCTP_LTRACE_ERR_RET(inp, stcb, net, file, err) if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LTRACE_ERROR_ENABLE) \ 211 printf("inp:%p stcb:%p net:%p file:%x line:%d error:%d\n", \ 212 inp, stcb, net, file, __LINE__, err); 213 #else 214 #define SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, file, err) 215 #define SCTP_LTRACE_ERR_RET(inp, stcb, net, file, err) 216 #endif 217 218 219 /* 220 * Local address and interface list handling 221 */ 222 #define SCTP_MAX_VRF_ID 0 223 #define SCTP_SIZE_OF_VRF_HASH 3 224 #define SCTP_IFNAMSIZ IFNAMSIZ 225 #define SCTP_DEFAULT_VRFID 0 226 #define SCTP_VRF_ADDR_HASH_SIZE 16 227 #define SCTP_VRF_IFN_HASH_SIZE 3 228 #define SCTP_INIT_VRF_TABLEID(vrf) 229 230 #define SCTP_IFN_IS_IFT_LOOP(ifn) ((ifn)->ifn_type == IFT_LOOP) 231 #define SCTP_ROUTE_IS_REAL_LOOP(ro) ((ro)->ro_rt && (ro)->ro_rt->rt_ifa && (ro)->ro_rt->rt_ifa->ifa_ifp && (ro)->ro_rt->rt_ifa->ifa_ifp->if_type == IFT_LOOP) 232 233 /* 234 * Access to IFN's to help with src-addr-selection 235 */ 236 /* This could return VOID if the index works but for BSD we provide both. */ 237 #define SCTP_GET_IFN_VOID_FROM_ROUTE(ro) (void *)ro->ro_rt->rt_ifp 238 #define SCTP_GET_IF_INDEX_FROM_ROUTE(ro) (ro)->ro_rt->rt_ifp->if_index 239 #define SCTP_ROUTE_HAS_VALID_IFN(ro) ((ro)->ro_rt && (ro)->ro_rt->rt_ifp) 240 241 /* 242 * general memory allocation 243 */ 244 #define SCTP_MALLOC(var, type, size, name) \ 245 do { \ 246 var = (type)malloc(size, name, M_NOWAIT); \ 247 } while (0) 248 249 #define SCTP_FREE(var, type) free(var, type) 250 251 #define SCTP_MALLOC_SONAME(var, type, size) \ 252 do { \ 253 var = (type)malloc(size, M_SONAME, M_WAITOK | M_ZERO); \ 254 } while (0) 255 256 #define SCTP_FREE_SONAME(var) free(var, M_SONAME) 257 258 #define SCTP_PROCESS_STRUCT struct proc * 259 260 /* 261 * zone allocation functions 262 */ 263 #include <vm/uma.h> 264 265 /* SCTP_ZONE_INIT: initialize the zone */ 266 typedef struct uma_zone *sctp_zone_t; 267 268 #define UMA_ZFLAG_FULL 0x0020 269 #define SCTP_ZONE_INIT(zone, name, size, number) { \ 270 zone = uma_zcreate(name, size, NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,\ 271 UMA_ZFLAG_FULL); \ 272 uma_zone_set_max(zone, number); \ 273 } 274 275 #define SCTP_ZONE_DESTROY(zone) uma_zdestroy(zone) 276 277 /* SCTP_ZONE_GET: allocate element from the zone */ 278 #define SCTP_ZONE_GET(zone, type) \ 279 (type *)uma_zalloc(zone, M_NOWAIT); 280 281 /* SCTP_ZONE_FREE: free element from the zone */ 282 #define SCTP_ZONE_FREE(zone, element) \ 283 uma_zfree(zone, element); 284 285 #define SCTP_HASH_INIT(size, hashmark) hashinit_flags(size, M_PCB, hashmark, HASH_NOWAIT) 286 #define SCTP_HASH_FREE(table, hashmark) hashdestroy(table, M_PCB, hashmark) 287 288 #define SCTP_M_COPYM m_copym 289 290 /* 291 * timers 292 */ 293 #include <sys/callout.h> 294 typedef struct callout sctp_os_timer_t; 295 296 297 #define SCTP_OS_TIMER_INIT(tmr) callout_init(tmr, 1) 298 #define SCTP_OS_TIMER_START callout_reset 299 #define SCTP_OS_TIMER_STOP callout_stop 300 #define SCTP_OS_TIMER_STOP_DRAIN callout_drain 301 #define SCTP_OS_TIMER_PENDING callout_pending 302 #define SCTP_OS_TIMER_ACTIVE callout_active 303 #define SCTP_OS_TIMER_DEACTIVATE callout_deactivate 304 305 #define sctp_get_tick_count() (ticks) 306 307 #define SCTP_UNUSED __attribute__((unused)) 308 309 /* 310 * Functions 311 */ 312 /* Mbuf manipulation and access macros */ 313 #define SCTP_BUF_LEN(m) (m->m_len) 314 #define SCTP_BUF_NEXT(m) (m->m_next) 315 #define SCTP_BUF_NEXT_PKT(m) (m->m_nextpkt) 316 #define SCTP_BUF_RESV_UF(m, size) m->m_data += size 317 #define SCTP_BUF_AT(m, size) m->m_data + size 318 #define SCTP_BUF_IS_EXTENDED(m) (m->m_flags & M_EXT) 319 #define SCTP_BUF_EXTEND_SIZE(m) (m->m_ext.ext_size) 320 #define SCTP_BUF_TYPE(m) (m->m_type) 321 #define SCTP_BUF_RECVIF(m) (m->m_pkthdr.rcvif) 322 #define SCTP_BUF_PREPEND M_PREPEND 323 324 #define SCTP_ALIGN_TO_END(m, len) if(m->m_flags & M_PKTHDR) { \ 325 MH_ALIGN(m, len); \ 326 } else if ((m->m_flags & M_EXT) == 0) { \ 327 M_ALIGN(m, len); \ 328 } 329 330 /* We make it so if you have up to 4 threads 331 * writting based on the default size of 332 * the packet log 65 k, that would be 333 * 4 16k packets before we would hit 334 * a problem. 335 */ 336 #define SCTP_PKTLOG_WRITERS_NEED_LOCK 3 337 338 /*************************/ 339 /* MTU */ 340 /*************************/ 341 #define SCTP_GATHER_MTU_FROM_IFN_INFO(ifn, ifn_index, af) ((struct ifnet *)ifn)->if_mtu 342 #define SCTP_GATHER_MTU_FROM_ROUTE(sctp_ifa, sa, rt) ((rt != NULL) ? rt->rt_rmx.rmx_mtu : 0) 343 #define SCTP_GATHER_MTU_FROM_INTFC(sctp_ifn) ((sctp_ifn->ifn_p != NULL) ? ((struct ifnet *)(sctp_ifn->ifn_p))->if_mtu : 0) 344 #define SCTP_SET_MTU_OF_ROUTE(sa, rt, mtu) do { \ 345 if (rt != NULL) \ 346 rt->rt_rmx.rmx_mtu = mtu; \ 347 } while(0) 348 349 /* (de-)register interface event notifications */ 350 #define SCTP_REGISTER_INTERFACE(ifhandle, af) 351 #define SCTP_DEREGISTER_INTERFACE(ifhandle, af) 352 353 354 /*************************/ 355 /* These are for logging */ 356 /*************************/ 357 /* return the base ext data pointer */ 358 #define SCTP_BUF_EXTEND_BASE(m) (m->m_ext.ext_buf) 359 /* return the refcnt of the data pointer */ 360 #define SCTP_BUF_EXTEND_REFCNT(m) (*m->m_ext.ref_cnt) 361 /* return any buffer related flags, this is 362 * used beyond logging for apple only. 363 */ 364 #define SCTP_BUF_GET_FLAGS(m) (m->m_flags) 365 366 /* For BSD this just accesses the M_PKTHDR length 367 * so it operates on an mbuf with hdr flag. Other 368 * O/S's may have seperate packet header and mbuf 369 * chain pointers.. thus the macro. 370 */ 371 #define SCTP_HEADER_TO_CHAIN(m) (m) 372 #define SCTP_DETACH_HEADER_FROM_CHAIN(m) 373 #define SCTP_HEADER_LEN(m) (m->m_pkthdr.len) 374 #define SCTP_GET_HEADER_FOR_OUTPUT(o_pak) 0 375 #define SCTP_RELEASE_HEADER(m) 376 #define SCTP_RELEASE_PKT(m) sctp_m_freem(m) 377 #define SCTP_ENABLE_UDP_CSUM(m) do { \ 378 m->m_pkthdr.csum_flags = CSUM_UDP; \ 379 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); \ 380 } while (0) 381 382 #define SCTP_GET_PKT_VRFID(m, vrf_id) ((vrf_id = SCTP_DEFAULT_VRFID) != SCTP_DEFAULT_VRFID) 383 384 385 386 /* Attach the chain of data into the sendable packet. */ 387 #define SCTP_ATTACH_CHAIN(pak, m, packet_length) do { \ 388 pak = m; \ 389 pak->m_pkthdr.len = packet_length; \ 390 } while(0) 391 392 /* Other m_pkthdr type things */ 393 #define SCTP_IS_IT_BROADCAST(dst, m) ((m->m_flags & M_PKTHDR) ? in_broadcast(dst, m->m_pkthdr.rcvif) : 0) 394 #define SCTP_IS_IT_LOOPBACK(m) ((m->m_flags & M_PKTHDR) && ((m->m_pkthdr.rcvif == NULL) || (m->m_pkthdr.rcvif->if_type == IFT_LOOP))) 395 396 397 /* This converts any input packet header 398 * into the chain of data holders, for BSD 399 * its a NOP. 400 */ 401 402 /* Macro's for getting length from V6/V4 header */ 403 #define SCTP_GET_IPV4_LENGTH(iph) (iph->ip_len) 404 #define SCTP_GET_IPV6_LENGTH(ip6) (ntohs(ip6->ip6_plen)) 405 406 /* get the v6 hop limit */ 407 #define SCTP_GET_HLIM(inp, ro) in6_selecthlim((struct in6pcb *)&inp->ip_inp.inp, (ro ? (ro->ro_rt ? (ro->ro_rt->rt_ifp) : (NULL)) : (NULL))); 408 409 /* is the endpoint v6only? */ 410 #define SCTP_IPV6_V6ONLY(inp) (((struct inpcb *)inp)->inp_flags & IN6P_IPV6_V6ONLY) 411 /* is the socket non-blocking? */ 412 #define SCTP_SO_IS_NBIO(so) ((so)->so_state & SS_NBIO) 413 #define SCTP_SET_SO_NBIO(so) ((so)->so_state |= SS_NBIO) 414 #define SCTP_CLEAR_SO_NBIO(so) ((so)->so_state &= ~SS_NBIO) 415 /* get the socket type */ 416 #define SCTP_SO_TYPE(so) ((so)->so_type) 417 /* reserve sb space for a socket */ 418 #define SCTP_SORESERVE(so, send, recv) soreserve(so, send, recv) 419 /* wakeup a socket */ 420 #define SCTP_SOWAKEUP(so) wakeup(&(so)->so_timeo) 421 /* clear the socket buffer state */ 422 #define SCTP_SB_CLEAR(sb) \ 423 (sb).sb_cc = 0; \ 424 (sb).sb_mb = NULL; \ 425 (sb).sb_mbcnt = 0; 426 427 #define SCTP_SB_LIMIT_RCV(so) so->so_rcv.sb_hiwat 428 #define SCTP_SB_LIMIT_SND(so) so->so_snd.sb_hiwat 429 430 /* 431 * routes, output, etc. 432 */ 433 typedef struct route sctp_route_t; 434 typedef struct rtentry sctp_rtentry_t; 435 436 #define SCTP_RTALLOC(ro, vrf_id) rtalloc_ign((struct route *)ro, 0UL) 437 438 /* Future zero copy wakeup/send function */ 439 #define SCTP_ZERO_COPY_EVENT(inp, so) 440 /* This is re-pulse ourselves for sendbuf */ 441 #define SCTP_ZERO_COPY_SENDQ_EVENT(inp, so) 442 443 /* 444 * IP output routines 445 */ 446 #define SCTP_IP_OUTPUT(result, o_pak, ro, stcb, vrf_id) \ 447 { \ 448 int o_flgs = 0; \ 449 if (stcb && stcb->sctp_ep && stcb->sctp_ep->sctp_socket) { \ 450 o_flgs = IP_RAWOUTPUT | (stcb->sctp_ep->sctp_socket->so_options & SO_DONTROUTE); \ 451 } else { \ 452 o_flgs = IP_RAWOUTPUT; \ 453 } \ 454 result = ip_output(o_pak, NULL, ro, o_flgs, 0, NULL); \ 455 } 456 457 #define SCTP_IP6_OUTPUT(result, o_pak, ro, ifp, stcb, vrf_id) \ 458 { \ 459 if (stcb && stcb->sctp_ep) \ 460 result = ip6_output(o_pak, \ 461 ((struct in6pcb *)(stcb->sctp_ep))->in6p_outputopts, \ 462 (ro), 0, 0, ifp, NULL); \ 463 else \ 464 result = ip6_output(o_pak, NULL, (ro), 0, 0, ifp, NULL); \ 465 } 466 467 struct mbuf * 468 sctp_get_mbuf_for_msg(unsigned int space_needed, 469 int want_header, int how, int allonebuf, int type); 470 471 472 /* 473 * SCTP AUTH 474 */ 475 #define HAVE_SHA2 476 477 #define SCTP_READ_RANDOM(buf, len) read_random(buf, len) 478 479 #ifdef USE_SCTP_SHA1 480 #include <netinet/sctp_sha1.h> 481 #else 482 #include <crypto/sha1.h> 483 /* map standard crypto API names */ 484 #define SHA1_Init SHA1Init 485 #define SHA1_Update SHA1Update 486 #define SHA1_Final(x,y) SHA1Final((caddr_t)x, y) 487 #endif 488 489 #if defined(HAVE_SHA2) 490 #include <crypto/sha2/sha2.h> 491 #endif 492 493 #include <sys/md5.h> 494 /* map standard crypto API names */ 495 #define MD5_Init MD5Init 496 #define MD5_Update MD5Update 497 #define MD5_Final MD5Final 498 499 #endif 500 501 #define SCTP_DECREMENT_AND_CHECK_REFCOUNT(addr) (atomic_fetchadd_int(addr, -1) == 1) 502 #if defined(INVARIANTS) 503 #define SCTP_SAVE_ATOMIC_DECREMENT(addr, val) \ 504 { \ 505 int32_t oldval; \ 506 oldval = atomic_fetchadd_int(addr, -val); \ 507 if (oldval < val) { \ 508 panic("Counter goes negative"); \ 509 } \ 510 } 511 #else 512 #define SCTP_SAVE_ATOMIC_DECREMENT(addr, val) \ 513 { \ 514 int32_t oldval; \ 515 oldval = atomic_fetchadd_int(addr, -val); \ 516 if (oldval < val) { \ 517 *addr = 0; \ 518 } \ 519 } 520 #endif 521