1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95 32 * 33 * $FreeBSD$ 34 */ 35 36 #ifndef _SYS_SOCKETVAR_H_ 37 #define _SYS_SOCKETVAR_H_ 38 39 /* 40 * Socket generation count type. Also used in xinpcb, xtcpcb, xunpcb. 41 */ 42 typedef uint64_t so_gen_t; 43 44 #if defined(_KERNEL) || defined(_WANT_SOCKET) 45 #include <sys/queue.h> /* for TAILQ macros */ 46 #include <sys/selinfo.h> /* for struct selinfo */ 47 #include <sys/_lock.h> 48 #include <sys/_mutex.h> 49 #include <sys/osd.h> 50 #include <sys/_sx.h> 51 #include <sys/sockbuf.h> 52 #ifdef _KERNEL 53 #include <sys/caprights.h> 54 #include <sys/sockopt.h> 55 #endif 56 57 struct vnet; 58 59 /* 60 * Kernel structure per socket. 61 * Contains send and receive buffer queues, 62 * handle on protocol and pointer to protocol 63 * private data and error information. 64 */ 65 typedef int so_upcall_t(struct socket *, void *, int); 66 typedef void so_dtor_t(struct socket *); 67 68 struct socket; 69 70 enum socket_qstate { 71 SQ_NONE = 0, 72 SQ_INCOMP = 0x0800, /* on sol_incomp */ 73 SQ_COMP = 0x1000, /* on sol_comp */ 74 }; 75 76 /*- 77 * Locking key to struct socket: 78 * (a) constant after allocation, no locking required. 79 * (b) locked by SOCK_LOCK(so). 80 * (cr) locked by SOCKBUF_LOCK(&so->so_rcv). 81 * (cs) locked by SOCKBUF_LOCK(&so->so_snd). 82 * (e) locked by SOLISTEN_LOCK() of corresponding listening socket. 83 * (f) not locked since integer reads/writes are atomic. 84 * (g) used only as a sleep/wakeup address, no value. 85 * (h) locked by global mutex so_global_mtx. 86 * (k) locked by KTLS workqueue mutex 87 */ 88 TAILQ_HEAD(accept_queue, socket); 89 struct socket { 90 struct mtx so_lock; 91 volatile u_int so_count; /* (b / refcount) */ 92 struct selinfo so_rdsel; /* (b/cr) for so_rcv/so_comp */ 93 struct selinfo so_wrsel; /* (b/cs) for so_snd */ 94 short so_type; /* (a) generic type, see socket.h */ 95 int so_options; /* (b) from socket call, see socket.h */ 96 short so_linger; /* time to linger close(2) */ 97 short so_state; /* (b) internal state flags SS_* */ 98 void *so_pcb; /* protocol control block */ 99 struct vnet *so_vnet; /* (a) network stack instance */ 100 struct protosw *so_proto; /* (a) protocol handle */ 101 short so_timeo; /* (g) connection timeout */ 102 u_short so_error; /* (f) error affecting connection */ 103 struct sigio *so_sigio; /* [sg] information for async I/O or 104 out of band data (SIGURG) */ 105 struct ucred *so_cred; /* (a) user credentials */ 106 struct label *so_label; /* (b) MAC label for socket */ 107 /* NB: generation count must not be first. */ 108 so_gen_t so_gencnt; /* (h) generation count */ 109 void *so_emuldata; /* (b) private data for emulators */ 110 so_dtor_t *so_dtor; /* (b) optional destructor */ 111 struct osd osd; /* Object Specific extensions */ 112 /* 113 * so_fibnum, so_user_cookie and friends can be used to attach 114 * some user-specified metadata to a socket, which then can be 115 * used by the kernel for various actions. 116 * so_user_cookie is used by ipfw/dummynet. 117 */ 118 int so_fibnum; /* routing domain for this socket */ 119 uint32_t so_user_cookie; 120 121 int so_ts_clock; /* type of the clock used for timestamps */ 122 uint32_t so_max_pacing_rate; /* (f) TX rate limit in bytes/s */ 123 union { 124 /* Regular (data flow) socket. */ 125 struct { 126 /* (cr, cs) Receive and send buffers. */ 127 struct sockbuf so_rcv, so_snd; 128 129 /* (e) Our place on accept queue. */ 130 TAILQ_ENTRY(socket) so_list; 131 struct socket *so_listen; /* (b) */ 132 enum socket_qstate so_qstate; /* (b) */ 133 /* (b) cached MAC label for peer */ 134 struct label *so_peerlabel; 135 u_long so_oobmark; /* chars to oob mark */ 136 137 /* (k) Our place on KTLS RX work queue. */ 138 STAILQ_ENTRY(socket) so_ktls_rx_list; 139 }; 140 /* 141 * Listening socket, where accepts occur, is so_listen in all 142 * subsidiary sockets. If so_listen is NULL, socket is not 143 * related to an accept. For a listening socket itself 144 * sol_incomp queues partially completed connections, while 145 * sol_comp is a queue of connections ready to be accepted. 146 * If a connection is aborted and it has so_listen set, then 147 * it has to be pulled out of either sol_incomp or sol_comp. 148 * We allow connections to queue up based on current queue 149 * lengths and limit on number of queued connections for this 150 * socket. 151 */ 152 struct { 153 /* (e) queue of partial unaccepted connections */ 154 struct accept_queue sol_incomp; 155 /* (e) queue of complete unaccepted connections */ 156 struct accept_queue sol_comp; 157 u_int sol_qlen; /* (e) sol_comp length */ 158 u_int sol_incqlen; /* (e) sol_incomp length */ 159 u_int sol_qlimit; /* (e) queue limit */ 160 161 /* accept_filter(9) optional data */ 162 struct accept_filter *sol_accept_filter; 163 void *sol_accept_filter_arg; /* saved filter args */ 164 char *sol_accept_filter_str; /* saved user args */ 165 166 /* Optional upcall, for kernel socket. */ 167 so_upcall_t *sol_upcall; /* (e) */ 168 void *sol_upcallarg; /* (e) */ 169 170 /* Socket buffer parameters, to be copied to 171 * dataflow sockets, accepted from this one. */ 172 int sol_sbrcv_lowat; 173 int sol_sbsnd_lowat; 174 u_int sol_sbrcv_hiwat; 175 u_int sol_sbsnd_hiwat; 176 short sol_sbrcv_flags; 177 short sol_sbsnd_flags; 178 sbintime_t sol_sbrcv_timeo; 179 sbintime_t sol_sbsnd_timeo; 180 181 /* Information tracking listen queue overflows. */ 182 struct timeval sol_lastover; /* (e) */ 183 int sol_overcount; /* (e) */ 184 }; 185 }; 186 #ifdef LVS_TCPOPT_TOA 187 uint8_t so_toa[8]; /* lvs toa option */ 188 #endif 189 }; 190 #endif /* defined(_KERNEL) || defined(_WANT_SOCKET) */ 191 192 /* 193 * Socket state bits. 194 * 195 * Historically, these bits were all kept in the so_state field. 196 * They are now split into separate, lock-specific fields. 197 * so_state maintains basic socket state protected by the socket lock. 198 * so_qstate holds information about the socket accept queues. 199 * Each socket buffer also has a state field holding information 200 * relevant to that socket buffer (can't send, rcv). 201 * Many fields will be read without locks to improve performance and avoid 202 * lock order issues. However, this approach must be used with caution. 203 */ 204 #define SS_NOFDREF 0x0001 /* no file table ref any more */ 205 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */ 206 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */ 207 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */ 208 #define SS_NBIO 0x0100 /* non-blocking ops */ 209 #define SS_ASYNC 0x0200 /* async i/o notify */ 210 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */ 211 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */ 212 213 /* 214 * Protocols can mark a socket as SS_PROTOREF to indicate that, following 215 * pru_detach, they still want the socket to persist, and will free it 216 * themselves when they are done. Protocols should only ever call sofree() 217 * following setting this flag in pru_detach(), and never otherwise, as 218 * sofree() bypasses socket reference counting. 219 */ 220 #define SS_PROTOREF 0x4000 /* strong protocol reference */ 221 222 #ifdef _KERNEL 223 224 #define SOCK_MTX(so) &(so)->so_lock 225 #define SOCK_LOCK(so) mtx_lock(&(so)->so_lock) 226 #define SOCK_OWNED(so) mtx_owned(&(so)->so_lock) 227 #define SOCK_UNLOCK(so) mtx_unlock(&(so)->so_lock) 228 #define SOCK_LOCK_ASSERT(so) mtx_assert(&(so)->so_lock, MA_OWNED) 229 #define SOCK_UNLOCK_ASSERT(so) mtx_assert(&(so)->so_lock, MA_NOTOWNED) 230 231 #define SOLISTENING(sol) (((sol)->so_options & SO_ACCEPTCONN) != 0) 232 #define SOLISTEN_LOCK(sol) do { \ 233 mtx_lock(&(sol)->so_lock); \ 234 KASSERT(SOLISTENING(sol), \ 235 ("%s: %p not listening", __func__, (sol))); \ 236 } while (0) 237 #define SOLISTEN_TRYLOCK(sol) mtx_trylock(&(sol)->so_lock) 238 #define SOLISTEN_UNLOCK(sol) do { \ 239 KASSERT(SOLISTENING(sol), \ 240 ("%s: %p not listening", __func__, (sol))); \ 241 mtx_unlock(&(sol)->so_lock); \ 242 } while (0) 243 #define SOLISTEN_LOCK_ASSERT(sol) do { \ 244 mtx_assert(&(sol)->so_lock, MA_OWNED); \ 245 KASSERT(SOLISTENING(sol), \ 246 ("%s: %p not listening", __func__, (sol))); \ 247 } while (0) 248 249 /* 250 * Macros for sockets and socket buffering. 251 */ 252 253 /* 254 * Flags to sblock(). 255 */ 256 #define SBL_WAIT 0x00000001 /* Wait if not immediately available. */ 257 #define SBL_NOINTR 0x00000002 /* Force non-interruptible sleep. */ 258 #define SBL_VALID (SBL_WAIT | SBL_NOINTR) 259 260 /* 261 * Do we need to notify the other side when I/O is possible? 262 */ 263 #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \ 264 SB_UPCALL | SB_AIO | SB_KNOTE)) != 0) 265 266 /* do we have to send all at once on a socket? */ 267 #define sosendallatonce(so) \ 268 ((so)->so_proto->pr_flags & PR_ATOMIC) 269 270 /* can we read something from so? */ 271 #define soreadabledata(so) \ 272 (sbavail(&(so)->so_rcv) >= (so)->so_rcv.sb_lowat || (so)->so_error) 273 #define soreadable(so) \ 274 (soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE)) 275 276 /* can we write something to so? */ 277 #define sowriteable(so) \ 278 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \ 279 (((so)->so_state&SS_ISCONNECTED) || \ 280 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \ 281 ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \ 282 (so)->so_error) 283 284 /* 285 * soref()/sorele() ref-count the socket structure. 286 * soref() may be called without owning socket lock, but in that case a 287 * caller must own something that holds socket, and so_count must be not 0. 288 * Note that you must still explicitly close the socket, but the last ref 289 * count will free the structure. 290 */ 291 #define soref(so) refcount_acquire(&(so)->so_count) 292 #define sorele(so) do { \ 293 SOCK_LOCK_ASSERT(so); \ 294 if (refcount_release(&(so)->so_count)) \ 295 sofree(so); \ 296 else \ 297 SOCK_UNLOCK(so); \ 298 } while (0) 299 300 /* 301 * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to 302 * avoid a non-atomic test-and-wakeup. However, sowakeup is 303 * responsible for releasing the lock if it is called. We unlock only 304 * if we don't call into sowakeup. If any code is introduced that 305 * directly invokes the underlying sowakeup() primitives, it must 306 * maintain the same semantics. 307 */ 308 #define sorwakeup_locked(so) do { \ 309 SOCKBUF_LOCK_ASSERT(&(so)->so_rcv); \ 310 if (sb_notify(&(so)->so_rcv)) \ 311 sowakeup((so), &(so)->so_rcv); \ 312 else \ 313 SOCKBUF_UNLOCK(&(so)->so_rcv); \ 314 } while (0) 315 316 #define sorwakeup(so) do { \ 317 SOCKBUF_LOCK(&(so)->so_rcv); \ 318 sorwakeup_locked(so); \ 319 } while (0) 320 321 #define sowwakeup_locked(so) do { \ 322 SOCKBUF_LOCK_ASSERT(&(so)->so_snd); \ 323 if (sb_notify(&(so)->so_snd)) \ 324 sowakeup((so), &(so)->so_snd); \ 325 else \ 326 SOCKBUF_UNLOCK(&(so)->so_snd); \ 327 } while (0) 328 329 #define sowwakeup(so) do { \ 330 SOCKBUF_LOCK(&(so)->so_snd); \ 331 sowwakeup_locked(so); \ 332 } while (0) 333 334 struct accept_filter { 335 char accf_name[16]; 336 int (*accf_callback) 337 (struct socket *so, void *arg, int waitflag); 338 void * (*accf_create) 339 (struct socket *so, char *arg); 340 void (*accf_destroy) 341 (struct socket *so); 342 SLIST_ENTRY(accept_filter) accf_next; 343 }; 344 345 #define ACCEPT_FILTER_DEFINE(modname, filtname, cb, create, destroy, ver) \ 346 static struct accept_filter modname##_filter = { \ 347 .accf_name = filtname, \ 348 .accf_callback = cb, \ 349 .accf_create = create, \ 350 .accf_destroy = destroy, \ 351 }; \ 352 static moduledata_t modname##_mod = { \ 353 .name = __XSTRING(modname), \ 354 .evhand = accept_filt_generic_mod_event, \ 355 .priv = &modname##_filter, \ 356 }; \ 357 DECLARE_MODULE(modname, modname##_mod, SI_SUB_DRIVERS, \ 358 SI_ORDER_MIDDLE); \ 359 MODULE_VERSION(modname, ver) 360 361 #ifdef MALLOC_DECLARE 362 MALLOC_DECLARE(M_ACCF); 363 MALLOC_DECLARE(M_PCB); 364 MALLOC_DECLARE(M_SONAME); 365 #endif 366 367 /* 368 * Socket specific helper hook point identifiers 369 * Do not leave holes in the sequence, hook registration is a loop. 370 */ 371 #define HHOOK_SOCKET_OPT 0 372 #define HHOOK_SOCKET_CREATE 1 373 #define HHOOK_SOCKET_RCV 2 374 #define HHOOK_SOCKET_SND 3 375 #define HHOOK_FILT_SOREAD 4 376 #define HHOOK_FILT_SOWRITE 5 377 #define HHOOK_SOCKET_CLOSE 6 378 #define HHOOK_SOCKET_LAST HHOOK_SOCKET_CLOSE 379 380 struct socket_hhook_data { 381 struct socket *so; 382 struct mbuf *m; 383 void *hctx; /* hook point specific data*/ 384 int status; 385 }; 386 387 extern int maxsockets; 388 extern u_long sb_max; 389 extern so_gen_t so_gencnt; 390 391 struct file; 392 struct filecaps; 393 struct filedesc; 394 struct mbuf; 395 struct sockaddr; 396 struct ucred; 397 struct uio; 398 399 /* 'which' values for socket upcalls. */ 400 #define SO_RCV 1 401 #define SO_SND 2 402 403 /* Return values for socket upcalls. */ 404 #define SU_OK 0 405 #define SU_ISCONNECTED 1 406 407 /* 408 * From uipc_socket and friends 409 */ 410 int getsockaddr(struct sockaddr **namp, const struct sockaddr *uaddr, 411 size_t len); 412 int getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp, 413 struct file **fpp, u_int *fflagp, struct filecaps *havecaps); 414 void soabort(struct socket *so); 415 int soaccept(struct socket *so, struct sockaddr **nam); 416 void soaio_enqueue(struct task *task); 417 void soaio_rcv(void *context, int pending); 418 void soaio_snd(void *context, int pending); 419 int socheckuid(struct socket *so, uid_t uid); 420 int sobind(struct socket *so, struct sockaddr *nam, struct thread *td); 421 int sobindat(int fd, struct socket *so, struct sockaddr *nam, 422 struct thread *td); 423 int soclose(struct socket *so); 424 int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td); 425 int soconnectat(int fd, struct socket *so, struct sockaddr *nam, 426 struct thread *td); 427 int soconnect2(struct socket *so1, struct socket *so2); 428 int socreate(int dom, struct socket **aso, int type, int proto, 429 struct ucred *cred, struct thread *td); 430 int sodisconnect(struct socket *so); 431 void sodtor_set(struct socket *, so_dtor_t *); 432 struct sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags); 433 void sofree(struct socket *so); 434 void sohasoutofband(struct socket *so); 435 int solisten(struct socket *so, int backlog, struct thread *td); 436 void solisten_proto(struct socket *so, int backlog); 437 int solisten_proto_check(struct socket *so); 438 int solisten_dequeue(struct socket *, struct socket **, int); 439 struct socket * 440 sonewconn(struct socket *head, int connstatus); 441 struct socket * 442 sopeeloff(struct socket *); 443 int sopoll(struct socket *so, int events, struct ucred *active_cred, 444 struct thread *td); 445 int sopoll_generic(struct socket *so, int events, 446 struct ucred *active_cred, struct thread *td); 447 int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio, 448 struct mbuf **mp0, struct mbuf **controlp, int *flagsp); 449 int soreceive_stream(struct socket *so, struct sockaddr **paddr, 450 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, 451 int *flagsp); 452 int soreceive_dgram(struct socket *so, struct sockaddr **paddr, 453 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, 454 int *flagsp); 455 int soreceive_generic(struct socket *so, struct sockaddr **paddr, 456 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, 457 int *flagsp); 458 int soreserve(struct socket *so, u_long sndcc, u_long rcvcc); 459 void sorflush(struct socket *so); 460 int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio, 461 struct mbuf *top, struct mbuf *control, int flags, 462 struct thread *td); 463 int sosend_dgram(struct socket *so, struct sockaddr *addr, 464 struct uio *uio, struct mbuf *top, struct mbuf *control, 465 int flags, struct thread *td); 466 int sosend_generic(struct socket *so, struct sockaddr *addr, 467 struct uio *uio, struct mbuf *top, struct mbuf *control, 468 int flags, struct thread *td); 469 int soshutdown(struct socket *so, int how); 470 void soupcall_clear(struct socket *, int); 471 void soupcall_set(struct socket *, int, so_upcall_t, void *); 472 void solisten_upcall_set(struct socket *, so_upcall_t, void *); 473 void sowakeup(struct socket *so, struct sockbuf *sb); 474 void sowakeup_aio(struct socket *so, struct sockbuf *sb); 475 void solisten_wakeup(struct socket *); 476 int selsocket(struct socket *so, int events, struct timeval *tv, 477 struct thread *td); 478 void soisconnected(struct socket *so); 479 void soisconnecting(struct socket *so); 480 void soisdisconnected(struct socket *so); 481 void soisdisconnecting(struct socket *so); 482 void socantrcvmore(struct socket *so); 483 void socantrcvmore_locked(struct socket *so); 484 void socantsendmore(struct socket *so); 485 void socantsendmore_locked(struct socket *so); 486 487 /* 488 * Accept filter functions (duh). 489 */ 490 int accept_filt_add(struct accept_filter *filt); 491 int accept_filt_del(char *name); 492 struct accept_filter *accept_filt_get(char *name); 493 #ifdef ACCEPT_FILTER_MOD 494 #ifdef SYSCTL_DECL 495 SYSCTL_DECL(_net_inet_accf); 496 #endif 497 int accept_filt_generic_mod_event(module_t mod, int event, void *data); 498 #endif 499 500 #endif /* _KERNEL */ 501 502 /* 503 * Structure to export socket from kernel to utilities, via sysctl(3). 504 */ 505 struct xsocket { 506 ksize_t xso_len; /* length of this structure */ 507 kvaddr_t xso_so; /* kernel address of struct socket */ 508 kvaddr_t so_pcb; /* kernel address of struct inpcb */ 509 uint64_t so_oobmark; 510 int64_t so_spare64[8]; 511 int32_t xso_protocol; 512 int32_t xso_family; 513 uint32_t so_qlen; 514 uint32_t so_incqlen; 515 uint32_t so_qlimit; 516 pid_t so_pgid; 517 uid_t so_uid; 518 int32_t so_spare32[8]; 519 int16_t so_type; 520 int16_t so_options; 521 int16_t so_linger; 522 int16_t so_state; 523 int16_t so_timeo; 524 uint16_t so_error; 525 struct xsockbuf { 526 uint32_t sb_cc; 527 uint32_t sb_hiwat; 528 uint32_t sb_mbcnt; 529 uint32_t sb_mcnt; 530 uint32_t sb_ccnt; 531 uint32_t sb_mbmax; 532 int32_t sb_lowat; 533 int32_t sb_timeo; 534 int16_t sb_flags; 535 } so_rcv, so_snd; 536 }; 537 538 #ifdef _KERNEL 539 void sotoxsocket(struct socket *so, struct xsocket *xso); 540 void sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb); 541 #endif 542 543 /* 544 * Socket buffer state bits. Exported via libprocstat(3). 545 */ 546 #define SBS_CANTSENDMORE 0x0010 /* can't send more data to peer */ 547 #define SBS_CANTRCVMORE 0x0020 /* can't receive more data from peer */ 548 #define SBS_RCVATMARK 0x0040 /* at mark on input */ 549 550 #endif /* !_SYS_SOCKETVAR_H_ */ 551