FreeBSD/Linux Kernel Cross Reference
sys/sys/socket.h
1 /*-
2 * Copyright (c) 1982, 1985, 1986, 1988, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)socket.h 8.4 (Berkeley) 2/21/94
30 * $FreeBSD: releng/5.4/sys/sys/socket.h 145335 2005-04-20 19:11:07Z cvs2svn $
31 */
32
33 #ifndef _SYS_SOCKET_H_
34 #define _SYS_SOCKET_H_
35
36 #include <sys/cdefs.h>
37 #include <sys/_types.h>
38 #include <sys/_iovec.h>
39 #define _NO_NAMESPACE_POLLUTION
40 #include <machine/param.h>
41 #undef _NO_NAMESPACE_POLLUTION
42
43 /*
44 * Definitions related to sockets: types, address families, options.
45 */
46
47 /*
48 * Data types.
49 */
50 #if __BSD_VISIBLE
51 #ifndef _GID_T_DECLARED
52 typedef __gid_t gid_t;
53 #define _GID_T_DECLARED
54 #endif
55
56 #ifndef _OFF_T_DECLARED
57 typedef __off_t off_t;
58 #define _OFF_T_DECLARED
59 #endif
60
61 #ifndef _PID_T_DECLARED
62 typedef __pid_t pid_t;
63 #define _PID_T_DECLARED
64 #endif
65 #endif
66
67 #ifndef _SA_FAMILY_T_DECLARED
68 typedef __sa_family_t sa_family_t;
69 #define _SA_FAMILY_T_DECLARED
70 #endif
71
72 #ifndef _SOCKLEN_T_DECLARED
73 typedef __socklen_t socklen_t;
74 #define _SOCKLEN_T_DECLARED
75 #endif
76
77 #ifndef _SSIZE_T_DECLARED
78 typedef __ssize_t ssize_t;
79 #define _SSIZE_T_DECLARED
80 #endif
81
82 #if __BSD_VISIBLE
83 #ifndef _UID_T_DECLARED
84 typedef __uid_t uid_t;
85 #define _UID_T_DECLARED
86 #endif
87 #endif
88
89 /*
90 * Types
91 */
92 #define SOCK_STREAM 1 /* stream socket */
93 #define SOCK_DGRAM 2 /* datagram socket */
94 #define SOCK_RAW 3 /* raw-protocol interface */
95 #if __BSD_VISIBLE
96 #define SOCK_RDM 4 /* reliably-delivered message */
97 #endif
98 #define SOCK_SEQPACKET 5 /* sequenced packet stream */
99
100 /*
101 * Option flags per-socket.
102 */
103 #define SO_DEBUG 0x0001 /* turn on debugging info recording */
104 #define SO_ACCEPTCONN 0x0002 /* socket has had listen() */
105 #define SO_REUSEADDR 0x0004 /* allow local address reuse */
106 #define SO_KEEPALIVE 0x0008 /* keep connections alive */
107 #define SO_DONTROUTE 0x0010 /* just use interface addresses */
108 #define SO_BROADCAST 0x0020 /* permit sending of broadcast msgs */
109 #if __BSD_VISIBLE
110 #define SO_USELOOPBACK 0x0040 /* bypass hardware when possible */
111 #endif
112 #define SO_LINGER 0x0080 /* linger on close if data present */
113 #define SO_OOBINLINE 0x0100 /* leave received OOB data in line */
114 #if __BSD_VISIBLE
115 #define SO_REUSEPORT 0x0200 /* allow local address & port reuse */
116 #define SO_TIMESTAMP 0x0400 /* timestamp received dgram traffic */
117 #define SO_NOSIGPIPE 0x0800 /* no SIGPIPE from EPIPE */
118 #define SO_ACCEPTFILTER 0x1000 /* there is an accept filter */
119 #define SO_BINTIME 0x2000 /* timestamp received dgram traffic */
120 #endif
121
122 /*
123 * Additional options, not kept in so_options.
124 */
125 #define SO_SNDBUF 0x1001 /* send buffer size */
126 #define SO_RCVBUF 0x1002 /* receive buffer size */
127 #define SO_SNDLOWAT 0x1003 /* send low-water mark */
128 #define SO_RCVLOWAT 0x1004 /* receive low-water mark */
129 #define SO_SNDTIMEO 0x1005 /* send timeout */
130 #define SO_RCVTIMEO 0x1006 /* receive timeout */
131 #define SO_ERROR 0x1007 /* get error status and clear */
132 #define SO_TYPE 0x1008 /* get socket type */
133 #if __BSD_VISIBLE
134 #define SO_LABEL 0x1009 /* socket's MAC label */
135 #define SO_PEERLABEL 0x1010 /* socket's peer's MAC label */
136 #endif
137
138 /*
139 * Structure used for manipulating linger option.
140 */
141 struct linger {
142 int l_onoff; /* option on/off */
143 int l_linger; /* linger time */
144 };
145
146 #if __BSD_VISIBLE
147 struct accept_filter_arg {
148 char af_name[16];
149 char af_arg[256-16];
150 };
151 #endif
152
153 /*
154 * Level number for (get/set)sockopt() to apply to socket itself.
155 */
156 #define SOL_SOCKET 0xffff /* options for socket level */
157
158 /*
159 * Address families.
160 */
161 #define AF_UNSPEC 0 /* unspecified */
162 #if __BSD_VISIBLE
163 #define AF_LOCAL AF_UNIX /* local to host (pipes, portals) */
164 #endif
165 #define AF_UNIX 1 /* standardized name for AF_LOCAL */
166 #define AF_INET 2 /* internetwork: UDP, TCP, etc. */
167 #if __BSD_VISIBLE
168 #define AF_IMPLINK 3 /* arpanet imp addresses */
169 #define AF_PUP 4 /* pup protocols: e.g. BSP */
170 #define AF_CHAOS 5 /* mit CHAOS protocols */
171 #define AF_NETBIOS 6 /* SMB protocols */
172 #define AF_ISO 7 /* ISO protocols */
173 #define AF_OSI AF_ISO
174 #define AF_ECMA 8 /* European computer manufacturers */
175 #define AF_DATAKIT 9 /* datakit protocols */
176 #define AF_CCITT 10 /* CCITT protocols, X.25 etc */
177 #define AF_SNA 11 /* IBM SNA */
178 #define AF_DECnet 12 /* DECnet */
179 #define AF_DLI 13 /* DEC Direct data link interface */
180 #define AF_LAT 14 /* LAT */
181 #define AF_HYLINK 15 /* NSC Hyperchannel */
182 #define AF_APPLETALK 16 /* Apple Talk */
183 #define AF_ROUTE 17 /* Internal Routing Protocol */
184 #define AF_LINK 18 /* Link layer interface */
185 #define pseudo_AF_XTP 19 /* eXpress Transfer Protocol (no AF) */
186 #define AF_COIP 20 /* connection-oriented IP, aka ST II */
187 #define AF_CNT 21 /* Computer Network Technology */
188 #define pseudo_AF_RTIP 22 /* Help Identify RTIP packets */
189 #define AF_IPX 23 /* Novell Internet Protocol */
190 #define AF_SIP 24 /* Simple Internet Protocol */
191 #define pseudo_AF_PIP 25 /* Help Identify PIP packets */
192 #define AF_ISDN 26 /* Integrated Services Digital Network*/
193 #define AF_E164 AF_ISDN /* CCITT E.164 recommendation */
194 #define pseudo_AF_KEY 27 /* Internal key-management function */
195 #endif
196 #define AF_INET6 28 /* IPv6 */
197 #if __BSD_VISIBLE
198 #define AF_NATM 29 /* native ATM access */
199 #define AF_ATM 30 /* ATM */
200 #define pseudo_AF_HDRCMPLT 31 /* Used by BPF to not rewrite headers
201 * in interface output routine
202 */
203 #define AF_NETGRAPH 32 /* Netgraph sockets */
204 #define AF_SLOW 33 /* 802.3ad slow protocol */
205 #define AF_SCLUSTER 34 /* Sitara cluster protocol */
206 #define AF_ARP 35
207 #define AF_BLUETOOTH 36 /* Bluetooth sockets */
208 #define AF_MAX 37
209 #endif
210
211 /*
212 * Structure used by kernel to store most
213 * addresses.
214 */
215 struct sockaddr {
216 unsigned char sa_len; /* total length */
217 sa_family_t sa_family; /* address family */
218 char sa_data[14]; /* actually longer; address value */
219 };
220 #if __BSD_VISIBLE
221 #define SOCK_MAXADDRLEN 255 /* longest possible addresses */
222
223 /*
224 * Structure used by kernel to pass protocol
225 * information in raw sockets.
226 */
227 struct sockproto {
228 unsigned short sp_family; /* address family */
229 unsigned short sp_protocol; /* protocol */
230 };
231 #endif
232
233 /*
234 * RFC 2553: protocol-independent placeholder for socket addresses
235 */
236 #define _SS_MAXSIZE 128U
237 #define _SS_ALIGNSIZE (sizeof(__int64_t))
238 #define _SS_PAD1SIZE (_SS_ALIGNSIZE - sizeof(unsigned char) - \
239 sizeof(sa_family_t))
240 #define _SS_PAD2SIZE (_SS_MAXSIZE - sizeof(unsigned char) - \
241 sizeof(sa_family_t) - _SS_PAD1SIZE - _SS_ALIGNSIZE)
242
243 struct sockaddr_storage {
244 unsigned char ss_len; /* address length */
245 sa_family_t ss_family; /* address family */
246 char __ss_pad1[_SS_PAD1SIZE];
247 __int64_t __ss_align; /* force desired struct alignment */
248 char __ss_pad2[_SS_PAD2SIZE];
249 };
250
251 #if __BSD_VISIBLE
252 /*
253 * Protocol families, same as address families for now.
254 */
255 #define PF_UNSPEC AF_UNSPEC
256 #define PF_LOCAL AF_LOCAL
257 #define PF_UNIX PF_LOCAL /* backward compatibility */
258 #define PF_INET AF_INET
259 #define PF_IMPLINK AF_IMPLINK
260 #define PF_PUP AF_PUP
261 #define PF_CHAOS AF_CHAOS
262 #define PF_NETBIOS AF_NETBIOS
263 #define PF_ISO AF_ISO
264 #define PF_OSI AF_ISO
265 #define PF_ECMA AF_ECMA
266 #define PF_DATAKIT AF_DATAKIT
267 #define PF_CCITT AF_CCITT
268 #define PF_SNA AF_SNA
269 #define PF_DECnet AF_DECnet
270 #define PF_DLI AF_DLI
271 #define PF_LAT AF_LAT
272 #define PF_HYLINK AF_HYLINK
273 #define PF_APPLETALK AF_APPLETALK
274 #define PF_ROUTE AF_ROUTE
275 #define PF_LINK AF_LINK
276 #define PF_XTP pseudo_AF_XTP /* really just proto family, no AF */
277 #define PF_COIP AF_COIP
278 #define PF_CNT AF_CNT
279 #define PF_SIP AF_SIP
280 #define PF_IPX AF_IPX
281 #define PF_RTIP pseudo_AF_RTIP /* same format as AF_INET */
282 #define PF_PIP pseudo_AF_PIP
283 #define PF_ISDN AF_ISDN
284 #define PF_KEY pseudo_AF_KEY
285 #define PF_INET6 AF_INET6
286 #define PF_NATM AF_NATM
287 #define PF_ATM AF_ATM
288 #define PF_NETGRAPH AF_NETGRAPH
289 #define PF_SLOW AF_SLOW
290 #define PF_SCLUSTER AF_SCLUSTER
291 #define PF_ARP AF_ARP
292 #define PF_BLUETOOTH AF_BLUETOOTH
293
294 #define PF_MAX AF_MAX
295
296 /*
297 * Definitions for network related sysctl, CTL_NET.
298 *
299 * Second level is protocol family.
300 * Third level is protocol number.
301 *
302 * Further levels are defined by the individual families below.
303 */
304 #define NET_MAXID AF_MAX
305
306 #define CTL_NET_NAMES { \
307 { 0, 0 }, \
308 { "unix", CTLTYPE_NODE }, \
309 { "inet", CTLTYPE_NODE }, \
310 { "implink", CTLTYPE_NODE }, \
311 { "pup", CTLTYPE_NODE }, \
312 { "chaos", CTLTYPE_NODE }, \
313 { "xerox_ns", CTLTYPE_NODE }, \
314 { "iso", CTLTYPE_NODE }, \
315 { "emca", CTLTYPE_NODE }, \
316 { "datakit", CTLTYPE_NODE }, \
317 { "ccitt", CTLTYPE_NODE }, \
318 { "ibm_sna", CTLTYPE_NODE }, \
319 { "decnet", CTLTYPE_NODE }, \
320 { "dec_dli", CTLTYPE_NODE }, \
321 { "lat", CTLTYPE_NODE }, \
322 { "hylink", CTLTYPE_NODE }, \
323 { "appletalk", CTLTYPE_NODE }, \
324 { "route", CTLTYPE_NODE }, \
325 { "link_layer", CTLTYPE_NODE }, \
326 { "xtp", CTLTYPE_NODE }, \
327 { "coip", CTLTYPE_NODE }, \
328 { "cnt", CTLTYPE_NODE }, \
329 { "rtip", CTLTYPE_NODE }, \
330 { "ipx", CTLTYPE_NODE }, \
331 { "sip", CTLTYPE_NODE }, \
332 { "pip", CTLTYPE_NODE }, \
333 { "isdn", CTLTYPE_NODE }, \
334 { "key", CTLTYPE_NODE }, \
335 { "inet6", CTLTYPE_NODE }, \
336 { "natm", CTLTYPE_NODE }, \
337 { "atm", CTLTYPE_NODE }, \
338 { "hdrcomplete", CTLTYPE_NODE }, \
339 { "netgraph", CTLTYPE_NODE }, \
340 { "snp", CTLTYPE_NODE }, \
341 { "scp", CTLTYPE_NODE }, \
342 }
343
344 /*
345 * PF_ROUTE - Routing table
346 *
347 * Three additional levels are defined:
348 * Fourth: address family, 0 is wildcard
349 * Fifth: type of info, defined below
350 * Sixth: flag(s) to mask with for NET_RT_FLAGS
351 */
352 #define NET_RT_DUMP 1 /* dump; may limit to a.f. */
353 #define NET_RT_FLAGS 2 /* by flags, e.g. RESOLVING */
354 #define NET_RT_IFLIST 3 /* survey interface list */
355 #define NET_RT_IFMALIST 4 /* return multicast address list */
356 #define NET_RT_MAXID 5
357
358 #define CTL_NET_RT_NAMES { \
359 { 0, 0 }, \
360 { "dump", CTLTYPE_STRUCT }, \
361 { "flags", CTLTYPE_STRUCT }, \
362 { "iflist", CTLTYPE_STRUCT }, \
363 { "ifmalist", CTLTYPE_STRUCT }, \
364 }
365 #endif /* __BSD_VISIBLE */
366
367 /*
368 * Maximum queue length specifiable by listen.
369 */
370 #define SOMAXCONN 128
371
372 /*
373 * Message header for recvmsg and sendmsg calls.
374 * Used value-result for recvmsg, value only for sendmsg.
375 */
376 struct msghdr {
377 void *msg_name; /* optional address */
378 socklen_t msg_namelen; /* size of address */
379 struct iovec *msg_iov; /* scatter/gather array */
380 int msg_iovlen; /* # elements in msg_iov */
381 void *msg_control; /* ancillary data, see below */
382 socklen_t msg_controllen; /* ancillary data buffer len */
383 int msg_flags; /* flags on received message */
384 };
385
386 #define MSG_OOB 0x1 /* process out-of-band data */
387 #define MSG_PEEK 0x2 /* peek at incoming message */
388 #define MSG_DONTROUTE 0x4 /* send without using routing tables */
389 #define MSG_EOR 0x8 /* data completes record */
390 #define MSG_TRUNC 0x10 /* data discarded before delivery */
391 #define MSG_CTRUNC 0x20 /* control data lost before delivery */
392 #define MSG_WAITALL 0x40 /* wait for full request or error */
393 #if __BSD_VISIBLE
394 #define MSG_DONTWAIT 0x80 /* this message should be nonblocking */
395 #define MSG_EOF 0x100 /* data completes connection */
396 #define MSG_NBIO 0x4000 /* FIONBIO mode, used by fifofs */
397 #define MSG_COMPAT 0x8000 /* used in sendit() */
398 #endif
399
400 /*
401 * Header for ancillary data objects in msg_control buffer.
402 * Used for additional information with/about a datagram
403 * not expressible by flags. The format is a sequence
404 * of message elements headed by cmsghdr structures.
405 */
406 struct cmsghdr {
407 socklen_t cmsg_len; /* data byte count, including hdr */
408 int cmsg_level; /* originating protocol */
409 int cmsg_type; /* protocol-specific type */
410 /* followed by u_char cmsg_data[]; */
411 };
412
413 #if __BSD_VISIBLE
414 /*
415 * While we may have more groups than this, the cmsgcred struct must
416 * be able to fit in an mbuf, and NGROUPS_MAX is too large to allow
417 * this.
418 */
419 #define CMGROUP_MAX 16
420
421 /*
422 * Credentials structure, used to verify the identity of a peer
423 * process that has sent us a message. This is allocated by the
424 * peer process but filled in by the kernel. This prevents the
425 * peer from lying about its identity. (Note that cmcred_groups[0]
426 * is the effective GID.)
427 */
428 struct cmsgcred {
429 pid_t cmcred_pid; /* PID of sending process */
430 uid_t cmcred_uid; /* real UID of sending process */
431 uid_t cmcred_euid; /* effective UID of sending process */
432 gid_t cmcred_gid; /* real GID of sending process */
433 short cmcred_ngroups; /* number or groups */
434 gid_t cmcred_groups[CMGROUP_MAX]; /* groups */
435 };
436 #endif /* __BSD_VISIBLE */
437
438 /* given pointer to struct cmsghdr, return pointer to data */
439 #define CMSG_DATA(cmsg) ((unsigned char *)(cmsg) + \
440 _ALIGN(sizeof(struct cmsghdr)))
441
442 /* given pointer to struct cmsghdr, return pointer to next cmsghdr */
443 #define CMSG_NXTHDR(mhdr, cmsg) \
444 (((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len) + \
445 _ALIGN(sizeof(struct cmsghdr)) > \
446 (char *)(mhdr)->msg_control + (mhdr)->msg_controllen) ? \
447 (struct cmsghdr *)0 : \
448 (struct cmsghdr *)((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len)))
449
450 /*
451 * RFC 2292 requires to check msg_controllen, in case that the kernel returns
452 * an empty list for some reasons.
453 */
454 #define CMSG_FIRSTHDR(mhdr) \
455 ((mhdr)->msg_controllen >= sizeof(struct cmsghdr) ? \
456 (struct cmsghdr *)(mhdr)->msg_control : \
457 (struct cmsghdr *)NULL)
458
459 #if __BSD_VISIBLE
460 /* RFC 2292 additions */
461 #define CMSG_SPACE(l) (_ALIGN(sizeof(struct cmsghdr)) + _ALIGN(l))
462 #define CMSG_LEN(l) (_ALIGN(sizeof(struct cmsghdr)) + (l))
463 #endif
464
465 #ifdef _KERNEL
466 #define CMSG_ALIGN(n) _ALIGN(n)
467 #endif
468
469 /* "Socket"-level control message types: */
470 #define SCM_RIGHTS 0x01 /* access rights (array of int) */
471 #if __BSD_VISIBLE
472 #define SCM_TIMESTAMP 0x02 /* timestamp (struct timeval) */
473 #define SCM_CREDS 0x03 /* process creds (struct cmsgcred) */
474 #define SCM_BINTIME 0x04 /* timestamp (struct bintime) */
475 #endif
476
477 #if __BSD_VISIBLE
478 /*
479 * 4.3 compat sockaddr, move to compat file later
480 */
481 struct osockaddr {
482 unsigned short sa_family; /* address family */
483 char sa_data[14]; /* up to 14 bytes of direct address */
484 };
485
486 /*
487 * 4.3-compat message header (move to compat file later).
488 */
489 struct omsghdr {
490 char *msg_name; /* optional address */
491 int msg_namelen; /* size of address */
492 struct iovec *msg_iov; /* scatter/gather array */
493 int msg_iovlen; /* # elements in msg_iov */
494 char *msg_accrights; /* access rights sent/received */
495 int msg_accrightslen;
496 };
497 #endif
498
499 /*
500 * howto arguments for shutdown(2), specified by Posix.1g.
501 */
502 #define SHUT_RD 0 /* shut down the reading side */
503 #define SHUT_WR 1 /* shut down the writing side */
504 #define SHUT_RDWR 2 /* shut down both sides */
505
506 #if __BSD_VISIBLE
507 /*
508 * sendfile(2) header/trailer struct
509 */
510 struct sf_hdtr {
511 struct iovec *headers; /* pointer to an array of header struct iovec's */
512 int hdr_cnt; /* number of header iovec's */
513 struct iovec *trailers; /* pointer to an array of trailer struct iovec's */
514 int trl_cnt; /* number of trailer iovec's */
515 };
516
517 /*
518 * Sendfile-specific flag(s)
519 */
520 #define SF_NODISKIO 0x00000001
521 #endif
522
523 #ifndef _KERNEL
524
525 #include <sys/cdefs.h>
526
527 __BEGIN_DECLS
528 int accept(int, struct sockaddr * __restrict, socklen_t * __restrict);
529 int bind(int, const struct sockaddr *, socklen_t);
530 int connect(int, const struct sockaddr *, socklen_t);
531 int getpeername(int, struct sockaddr * __restrict, socklen_t * __restrict);
532 int getsockname(int, struct sockaddr * __restrict, socklen_t * __restrict);
533 int getsockopt(int, int, int, void * __restrict, socklen_t * __restrict);
534 int listen(int, int);
535 ssize_t recv(int, void *, size_t, int);
536 ssize_t recvfrom(int, void *, size_t, int, struct sockaddr * __restrict, socklen_t * __restrict);
537 ssize_t recvmsg(int, struct msghdr *, int);
538 ssize_t send(int, const void *, size_t, int);
539 ssize_t sendto(int, const void *,
540 size_t, int, const struct sockaddr *, socklen_t);
541 ssize_t sendmsg(int, const struct msghdr *, int);
542 #if __BSD_VISIBLE
543 int sendfile(int, int, off_t, size_t, struct sf_hdtr *, off_t *, int);
544 #endif
545 int setsockopt(int, int, int, const void *, socklen_t);
546 int shutdown(int, int);
547 int sockatmark(int);
548 int socket(int, int, int);
549 int socketpair(int, int, int, int *);
550 __END_DECLS
551
552 #endif /* !_KERNEL */
553
554 #endif /* !_SYS_SOCKET_H_ */
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