1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #ifndef _NETINET_SCTP_LOCK_BSD_H_ 36 #define _NETINET_SCTP_LOCK_BSD_H_ 37 38 /* 39 * General locking concepts: The goal of our locking is to of course provide 40 * consistency and yet minimize overhead. We will attempt to use 41 * non-recursive locks which are supposed to be quite inexpensive. Now in 42 * order to do this the goal is that most functions are not aware of locking. 43 * Once we have a TCB we lock it and unlock when we are through. This means 44 * that the TCB lock is kind-of a "global" lock when working on an 45 * association. Caution must be used when asserting a TCB_LOCK since if we 46 * recurse we deadlock. 47 * 48 * Most other locks (INP and INFO) attempt to localize the locking i.e. we try 49 * to contain the lock and unlock within the function that needs to lock it. 50 * This sometimes mean we do extra locks and unlocks and lose a bit of 51 * efficiency, but if the performance statements about non-recursive locks are 52 * true this should not be a problem. One issue that arises with this only 53 * lock when needed is that if an implicit association setup is done we have 54 * a problem. If at the time I lookup an association I have NULL in the tcb 55 * return, by the time I call to create the association some other processor 56 * could have created it. This is what the CREATE lock on the endpoint. 57 * Places where we will be implicitly creating the association OR just 58 * creating an association (the connect call) will assert the CREATE_INP 59 * lock. This will assure us that during all the lookup of INP and INFO if 60 * another creator is also locking/looking up we can gate the two to 61 * synchronize. So the CREATE_INP lock is also another one we must use 62 * extreme caution in locking to make sure we don't hit a re-entrancy issue. 63 * 64 */ 65 66 /* 67 * When working with the global SCTP lists we lock and unlock the INP_INFO 68 * lock. So when we go to lookup an association we will want to do a 69 * SCTP_INP_INFO_RLOCK() and then when we want to add a new association to 70 * the SCTP_BASE_INFO() list's we will do a SCTP_INP_INFO_WLOCK(). 71 */ 72 73 #define SCTP_IPI_COUNT_INIT() 74 75 #define SCTP_STATLOG_INIT_LOCK() 76 #define SCTP_STATLOG_DESTROY() 77 #define SCTP_STATLOG_LOCK() 78 #define SCTP_STATLOG_UNLOCK() 79 80 #define SCTP_INP_INFO_LOCK_INIT() do { \ 81 rw_init(&SCTP_BASE_INFO(ipi_ep_mtx), "sctp-info"); \ 82 } while (0) 83 84 #define SCTP_INP_INFO_LOCK_DESTROY() do { \ 85 if (rw_wowned(&SCTP_BASE_INFO(ipi_ep_mtx))) { \ 86 rw_wunlock(&SCTP_BASE_INFO(ipi_ep_mtx)); \ 87 } \ 88 rw_destroy(&SCTP_BASE_INFO(ipi_ep_mtx)); \ 89 } while (0) 90 91 #define SCTP_INP_INFO_RLOCK() do { \ 92 rw_rlock(&SCTP_BASE_INFO(ipi_ep_mtx)); \ 93 } while (0) 94 95 #define SCTP_INP_INFO_WLOCK() do { \ 96 rw_wlock(&SCTP_BASE_INFO(ipi_ep_mtx)); \ 97 } while (0) 98 99 #define SCTP_INP_INFO_RUNLOCK() do { \ 100 rw_runlock(&SCTP_BASE_INFO(ipi_ep_mtx)); \ 101 } while (0) 102 103 #define SCTP_INP_INFO_WUNLOCK() do { \ 104 rw_wunlock(&SCTP_BASE_INFO(ipi_ep_mtx)); \ 105 } while (0) 106 107 #define SCTP_INP_INFO_LOCK_ASSERT() do { \ 108 rw_assert(&SCTP_BASE_INFO(ipi_ep_mtx), RA_LOCKED); \ 109 } while (0) 110 111 #define SCTP_INP_INFO_RLOCK_ASSERT() do { \ 112 rw_assert(&SCTP_BASE_INFO(ipi_ep_mtx), RA_RLOCKED); \ 113 } while (0) 114 115 #define SCTP_INP_INFO_WLOCK_ASSERT() do { \ 116 rw_assert(&SCTP_BASE_INFO(ipi_ep_mtx), RA_WLOCKED); \ 117 } while (0) 118 119 #define SCTP_MCORE_QLOCK_INIT(cpstr) do { \ 120 mtx_init(&(cpstr)->que_mtx, "sctp-mcore_queue","queue_lock", \ 121 MTX_DEF | MTX_DUPOK); \ 122 } while (0) 123 124 #define SCTP_MCORE_QDESTROY(cpstr) do { \ 125 if (mtx_owned(&(cpstr)->core_mtx)) { \ 126 mtx_unlock(&(cpstr)->que_mtx); \ 127 } \ 128 mtx_destroy(&(cpstr)->que_mtx); \ 129 } while (0) 130 131 #define SCTP_MCORE_QLOCK(cpstr) do { \ 132 mtx_lock(&(cpstr)->que_mtx); \ 133 } while (0) 134 135 #define SCTP_MCORE_QUNLOCK(cpstr) do { \ 136 mtx_unlock(&(cpstr)->que_mtx); \ 137 } while (0) 138 139 #define SCTP_MCORE_LOCK_INIT(cpstr) do { \ 140 mtx_init(&(cpstr)->core_mtx, "sctp-cpulck","cpu_proc_lock", \ 141 MTX_DEF | MTX_DUPOK); \ 142 } while (0) 143 144 #define SCTP_MCORE_DESTROY(cpstr) do { \ 145 if (mtx_owned(&(cpstr)->core_mtx)) { \ 146 mtx_unlock(&(cpstr)->core_mtx); \ 147 } \ 148 mtx_destroy(&(cpstr)->core_mtx); \ 149 } while (0) 150 151 #define SCTP_MCORE_LOCK(cpstr) do { \ 152 mtx_lock(&(cpstr)->core_mtx); \ 153 } while (0) 154 155 #define SCTP_MCORE_UNLOCK(cpstr) do { \ 156 mtx_unlock(&(cpstr)->core_mtx); \ 157 } while (0) 158 159 #define SCTP_IPI_ADDR_INIT() do { \ 160 rw_init(&SCTP_BASE_INFO(ipi_addr_mtx), "sctp-addr"); \ 161 } while (0) 162 163 #define SCTP_IPI_ADDR_DESTROY() do { \ 164 if (rw_wowned(&SCTP_BASE_INFO(ipi_addr_mtx))) { \ 165 rw_wunlock(&SCTP_BASE_INFO(ipi_addr_mtx)); \ 166 } \ 167 rw_destroy(&SCTP_BASE_INFO(ipi_addr_mtx)); \ 168 } while (0) 169 170 #define SCTP_IPI_ADDR_RLOCK() do { \ 171 rw_rlock(&SCTP_BASE_INFO(ipi_addr_mtx)); \ 172 } while (0) 173 174 #define SCTP_IPI_ADDR_WLOCK() do { \ 175 rw_wlock(&SCTP_BASE_INFO(ipi_addr_mtx)); \ 176 } while (0) 177 178 #define SCTP_IPI_ADDR_RUNLOCK() do { \ 179 rw_runlock(&SCTP_BASE_INFO(ipi_addr_mtx)); \ 180 } while (0) 181 182 #define SCTP_IPI_ADDR_WUNLOCK() do { \ 183 rw_wunlock(&SCTP_BASE_INFO(ipi_addr_mtx)); \ 184 } while (0) 185 186 #define SCTP_IPI_ADDR_LOCK_ASSERT() do { \ 187 rw_assert(&SCTP_BASE_INFO(ipi_addr_mtx), RA_LOCKED); \ 188 } while (0) 189 190 #define SCTP_IPI_ADDR_WLOCK_ASSERT() do { \ 191 rw_assert(&SCTP_BASE_INFO(ipi_addr_mtx), RA_WLOCKED); \ 192 } while (0) 193 194 #define SCTP_IPI_ITERATOR_WQ_INIT() do { \ 195 mtx_init(&sctp_it_ctl.ipi_iterator_wq_mtx, "sctp-it-wq", \ 196 "sctp_it_wq", MTX_DEF); \ 197 } while (0) 198 199 #define SCTP_IPI_ITERATOR_WQ_DESTROY() do { \ 200 mtx_destroy(&sctp_it_ctl.ipi_iterator_wq_mtx); \ 201 } while (0) 202 203 #define SCTP_IPI_ITERATOR_WQ_LOCK() do { \ 204 mtx_lock(&sctp_it_ctl.ipi_iterator_wq_mtx); \ 205 } while (0) 206 207 #define SCTP_IPI_ITERATOR_WQ_UNLOCK() do { \ 208 mtx_unlock(&sctp_it_ctl.ipi_iterator_wq_mtx); \ 209 } while (0) 210 211 #define SCTP_IP_PKTLOG_INIT() do { \ 212 mtx_init(&SCTP_BASE_INFO(ipi_pktlog_mtx), "sctp-pktlog", \ 213 "packetlog", MTX_DEF); \ 214 } while (0) 215 216 #define SCTP_IP_PKTLOG_DESTROY() do { \ 217 mtx_destroy(&SCTP_BASE_INFO(ipi_pktlog_mtx)); \ 218 } while (0) 219 220 #define SCTP_IP_PKTLOG_LOCK() do { \ 221 mtx_lock(&SCTP_BASE_INFO(ipi_pktlog_mtx)); \ 222 } while (0) 223 224 #define SCTP_IP_PKTLOG_UNLOCK() do { \ 225 mtx_unlock(&SCTP_BASE_INFO(ipi_pktlog_mtx)); \ 226 } while (0) 227 228 /* 229 * The INP locks we will use for locking an SCTP endpoint, so for example if 230 * we want to change something at the endpoint level for example random_store 231 * or cookie secrets we lock the INP level. 232 */ 233 234 #define SCTP_INP_READ_LOCK_INIT(_inp) do { \ 235 mtx_init(&(_inp)->inp_rdata_mtx, "sctp-read", "inpr", \ 236 MTX_DEF | MTX_DUPOK); \ 237 } while (0) 238 239 #define SCTP_INP_READ_LOCK_DESTROY(_inp) do { \ 240 mtx_destroy(&(_inp)->inp_rdata_mtx); \ 241 } while (0) 242 243 #define SCTP_INP_READ_LOCK(_inp) do { \ 244 mtx_lock(&(_inp)->inp_rdata_mtx); \ 245 } while (0) 246 247 #define SCTP_INP_READ_UNLOCK(_inp) do { \ 248 mtx_unlock(&(_inp)->inp_rdata_mtx); \ 249 } while (0) 250 251 #define SCTP_INP_READ_LOCK_ASSERT(_inp) do { \ 252 KASSERT(mtx_owned(&(_inp)->inp_rdata_mtx), \ 253 ("Don't own INP read queue lock")); \ 254 } while (0) 255 256 #define SCTP_INP_LOCK_INIT(_inp) do { \ 257 mtx_init(&(_inp)->inp_mtx, "sctp-inp", "inp", \ 258 MTX_DEF | MTX_DUPOK); \ 259 } while (0) 260 261 #define SCTP_INP_LOCK_DESTROY(_inp) do { \ 262 mtx_destroy(&(_inp)->inp_mtx); \ 263 } while (0) 264 265 #define SCTP_INP_LOCK_CONTENDED(_inp) \ 266 ((_inp)->inp_mtx.mtx_lock & MTX_CONTESTED) 267 268 #define SCTP_INP_READ_CONTENDED(_inp) \ 269 ((_inp)->inp_rdata_mtx.mtx_lock & MTX_CONTESTED) 270 271 #ifdef SCTP_LOCK_LOGGING 272 #define SCTP_INP_RLOCK(_inp) do { \ 273 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) \ 274 sctp_log_lock(_inp, NULL, SCTP_LOG_LOCK_INP); \ 275 mtx_lock(&(_inp)->inp_mtx); \ 276 } while (0) 277 278 #define SCTP_INP_WLOCK(_inp) do { \ 279 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) \ 280 sctp_log_lock(_inp, NULL, SCTP_LOG_LOCK_INP); \ 281 mtx_lock(&(_inp)->inp_mtx); \ 282 } while (0) 283 #else 284 #define SCTP_INP_RLOCK(_inp) do { \ 285 mtx_lock(&(_inp)->inp_mtx); \ 286 } while (0) 287 288 #define SCTP_INP_WLOCK(_inp) do { \ 289 mtx_lock(&(_inp)->inp_mtx); \ 290 } while (0) 291 #endif 292 293 #define SCTP_INP_RUNLOCK(_inp) do { \ 294 mtx_unlock(&(_inp)->inp_mtx); \ 295 } while (0) 296 297 #define SCTP_INP_WUNLOCK(_inp) do { \ 298 mtx_unlock(&(_inp)->inp_mtx); \ 299 } while (0) 300 301 #define SCTP_INP_RLOCK_ASSERT(_inp) do { \ 302 KASSERT(mtx_owned(&(_inp)->inp_mtx), \ 303 ("Don't own INP read lock")); \ 304 } while (0) 305 306 #define SCTP_INP_WLOCK_ASSERT(_inp) do { \ 307 KASSERT(mtx_owned(&(_inp)->inp_mtx), \ 308 ("Don't own INP write lock")); \ 309 } while (0) 310 311 #define SCTP_INP_INCR_REF(_inp) atomic_add_int(&((_inp)->refcount), 1) 312 #define SCTP_INP_DECR_REF(_inp) atomic_add_int(&((_inp)->refcount), -1) 313 314 #define SCTP_ASOC_CREATE_LOCK_INIT(_inp) do { \ 315 mtx_init(&(_inp)->inp_create_mtx, "sctp-create", "inp_create", \ 316 MTX_DEF | MTX_DUPOK); \ 317 } while (0) 318 319 #define SCTP_ASOC_CREATE_LOCK_DESTROY(_inp) do { \ 320 mtx_destroy(&(_inp)->inp_create_mtx); \ 321 } while (0) 322 323 #ifdef SCTP_LOCK_LOGGING 324 #define SCTP_ASOC_CREATE_LOCK(_inp) do { \ 325 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) \ 326 sctp_log_lock(_inp, NULL, SCTP_LOG_LOCK_CREATE); \ 327 mtx_lock(&(_inp)->inp_create_mtx); \ 328 } while (0) 329 #else 330 #define SCTP_ASOC_CREATE_LOCK(_inp) do { \ 331 mtx_lock(&(_inp)->inp_create_mtx); \ 332 } while (0) 333 #endif 334 335 #define SCTP_ASOC_CREATE_UNLOCK(_inp) do { \ 336 mtx_unlock(&(_inp)->inp_create_mtx); \ 337 } while (0) 338 339 #define SCTP_ASOC_CREATE_LOCK_CONTENDED(_inp) \ 340 ((_inp)->inp_create_mtx.mtx_lock & MTX_CONTESTED) 341 342 /* 343 * For the majority of things (once we have found the association) we will 344 * lock the actual association mutex. This will protect all the assoiciation 345 * level queues and streams and such. We will need to lock the socket layer 346 * when we stuff data up into the receiving sb_mb. I.e. we will need to do an 347 * extra SOCKBUF_LOCK(&so->so_rcv) even though the association is locked. 348 */ 349 350 #define SCTP_TCB_LOCK_INIT(_tcb) do { \ 351 mtx_init(&(_tcb)->tcb_mtx, "sctp-tcb", "tcb", \ 352 MTX_DEF | MTX_DUPOK); \ 353 } while (0) 354 355 #define SCTP_TCB_LOCK_DESTROY(_tcb) do { \ 356 mtx_destroy(&(_tcb)->tcb_mtx); \ 357 } while (0) 358 359 #ifdef SCTP_LOCK_LOGGING 360 #define SCTP_TCB_LOCK(_tcb) do { \ 361 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) \ 362 sctp_log_lock(_tcb->sctp_ep, _tcb, SCTP_LOG_LOCK_TCB); \ 363 mtx_lock(&(_tcb)->tcb_mtx); \ 364 } while (0) 365 #else 366 #define SCTP_TCB_LOCK(_tcb) do { \ 367 mtx_lock(&(_tcb)->tcb_mtx); \ 368 } while (0) 369 370 #endif 371 372 #define SCTP_TCB_TRYLOCK(_tcb) \ 373 mtx_trylock(&(_tcb)->tcb_mtx) 374 375 #define SCTP_TCB_UNLOCK(_tcb) do { \ 376 mtx_unlock(&(_tcb)->tcb_mtx); \ 377 } while (0) 378 379 #define SCTP_TCB_UNLOCK_IFOWNED(_tcb) do { \ 380 if (mtx_owned(&(_tcb)->tcb_mtx)) \ 381 mtx_unlock(&(_tcb)->tcb_mtx); \ 382 } while (0) 383 384 #define SCTP_TCB_LOCK_ASSERT(_tcb) do { \ 385 KASSERT(mtx_owned(&(_tcb)->tcb_mtx), \ 386 ("Don't own TCB lock")); \ 387 } while (0) 388 389 #define SCTP_ITERATOR_LOCK_INIT() do { \ 390 mtx_init(&sctp_it_ctl.it_mtx, "sctp-it", "iterator", MTX_DEF); \ 391 } while (0) 392 393 #define SCTP_ITERATOR_LOCK_DESTROY() do { \ 394 mtx_destroy(&sctp_it_ctl.it_mtx); \ 395 } while (0) 396 397 #define SCTP_ITERATOR_LOCK() \ 398 do { \ 399 KASSERT(!mtx_owned(&sctp_it_ctl.it_mtx), \ 400 ("Own the iterator lock")); \ 401 mtx_lock(&sctp_it_ctl.it_mtx); \ 402 } while (0) 403 404 #define SCTP_ITERATOR_UNLOCK() do { \ 405 mtx_unlock(&sctp_it_ctl.it_mtx); \ 406 } while (0) 407 408 #define SCTP_WQ_ADDR_INIT() do { \ 409 mtx_init(&SCTP_BASE_INFO(wq_addr_mtx), \ 410 "sctp-addr-wq","sctp_addr_wq", MTX_DEF); \ 411 } while (0) 412 413 #define SCTP_WQ_ADDR_DESTROY() do { \ 414 if (mtx_owned(&SCTP_BASE_INFO(wq_addr_mtx))) { \ 415 mtx_unlock(&SCTP_BASE_INFO(wq_addr_mtx)); \ 416 } \ 417 mtx_destroy(&SCTP_BASE_INFO(wq_addr_mtx)); \ 418 } while (0) 419 420 #define SCTP_WQ_ADDR_LOCK() do { \ 421 mtx_lock(&SCTP_BASE_INFO(wq_addr_mtx)); \ 422 } while (0) 423 424 #define SCTP_WQ_ADDR_UNLOCK() do { \ 425 mtx_unlock(&SCTP_BASE_INFO(wq_addr_mtx)); \ 426 } while (0) 427 428 #define SCTP_WQ_ADDR_LOCK_ASSERT() do { \ 429 KASSERT(mtx_owned(&SCTP_BASE_INFO(wq_addr_mtx)), \ 430 ("Don't own the ADDR-WQ lock")); \ 431 } while (0) 432 433 #define SCTP_INCR_EP_COUNT() do { \ 434 atomic_add_int(&SCTP_BASE_INFO(ipi_count_ep), 1); \ 435 } while (0) 436 437 #define SCTP_DECR_EP_COUNT() do { \ 438 atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_ep), 1); \ 439 } while (0) 440 441 #define SCTP_INCR_ASOC_COUNT() do { \ 442 atomic_add_int(&SCTP_BASE_INFO(ipi_count_asoc), 1); \ 443 } while (0) 444 445 #define SCTP_DECR_ASOC_COUNT() do { \ 446 atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_asoc), 1); \ 447 } while (0) 448 449 #define SCTP_INCR_LADDR_COUNT() do { \ 450 atomic_add_int(&SCTP_BASE_INFO(ipi_count_laddr), 1); \ 451 } while (0) 452 453 #define SCTP_DECR_LADDR_COUNT() do { \ 454 atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_laddr), 1); \ 455 } while (0) 456 457 #define SCTP_INCR_RADDR_COUNT() do { \ 458 atomic_add_int(&SCTP_BASE_INFO(ipi_count_raddr), 1); \ 459 } while (0) 460 461 #define SCTP_DECR_RADDR_COUNT() do { \ 462 atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_raddr),1); \ 463 } while (0) 464 465 #define SCTP_INCR_CHK_COUNT() do { \ 466 atomic_add_int(&SCTP_BASE_INFO(ipi_count_chunk), 1); \ 467 } while (0) 468 469 #define SCTP_DECR_CHK_COUNT() do { \ 470 KASSERT(SCTP_BASE_INFO(ipi_count_chunk) > 0, \ 471 ("ipi_count_chunk would become negative")); \ 472 if (SCTP_BASE_INFO(ipi_count_chunk) != 0) \ 473 atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_chunk), \ 474 1); \ 475 } while (0) 476 477 #define SCTP_INCR_READQ_COUNT() do { \ 478 atomic_add_int(&SCTP_BASE_INFO(ipi_count_readq), 1); \ 479 } while (0) 480 481 #define SCTP_DECR_READQ_COUNT() do { \ 482 atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_readq), 1); \ 483 } while (0) 484 485 #define SCTP_INCR_STRMOQ_COUNT() do { \ 486 atomic_add_int(&SCTP_BASE_INFO(ipi_count_strmoq), 1); \ 487 } while (0) 488 489 #define SCTP_DECR_STRMOQ_COUNT() do { \ 490 atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_strmoq), 1); \ 491 } while (0) 492 493 #if defined(SCTP_SO_LOCK_TESTING) 494 #define SCTP_INP_SO(sctpinp) \ 495 (sctpinp)->ip_inp.inp.inp_socket 496 #define SCTP_SOCKET_LOCK(so, refcnt) 497 #define SCTP_SOCKET_UNLOCK(so, refcnt) 498 #endif 499 500 #endif 501