1/* 2 * Copyright (c) 2008 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/*! 29 @header kpi_socketfilter.h 30 This header defines an API for intercepting communications at the 31 socket layer. 32 33 For the most part, socket filters want to do three things: Filter 34 data in and out, watch for state changes, and intercept a few calls 35 for security. The number of function pointers supplied by a socket 36 filter has been significantly reduced. The filter no longer has any 37 knowledge of socket buffers. The filter no longer intercepts nearly 38 every internal socket call. There are two data filters, an in 39 filter, and an out filter. The in filter occurs before data is 40 placed in the receive socket buffer. This is done to avoid waking 41 the process unnecessarily. The out filter occurs before the data is 42 appended to the send socket buffer. This should cover inbound and 43 outbound data. For monitoring state changes, we've added a notify 44 function that will be called when various events that the filter can 45 not intercept occur. In addition, we've added a few functions that a 46 filter may use to intercept common operations. These functions are: 47 connect (inbound), connect (outbound), bind, set socket option, 48 get socket option, and listen. Bind, listen, connect in, and connect 49 out could be used together to build a fairly comprehensive firewall 50 without having to do much with individual packets. 51 */ 52#ifndef __KPI_SOCKETFILTER__ 53#define __KPI_SOCKETFILTER__ 54 55#include <sys/kernel_types.h> 56#include <sys/kpi_socket.h> 57 58struct sockaddr; 59 60/*! 61 @enum sflt_flags 62 @abstract Constants defining mbuf flags. Only the flags listed below 63 can be set or retrieved. 64 @constant SFLT_GLOBAL Indicates this socket filter should be 65 attached to all new sockets when they're created. 66 @constant SFLT_PROG Indicates this socket filter should be attached 67 only when request by the application using the SO_NKE socket 68 option. 69 @constant SFLT_EXTENDED Indicates that this socket filter utilizes 70 the extended fields within the sflt_filter structure. 71 @constant SFLT_EXTENDED_REGISTRY Indicates that this socket filter 72 wants to attach to all the sockets already present on the 73 system. It will also receive notifications for these sockets. 74*/ 75enum { 76 SFLT_GLOBAL = 0x01, 77 SFLT_PROG = 0x02, 78 SFLT_EXTENDED = 0x04, 79 SFLT_EXTENDED_REGISTRY = 0x08 80}; 81typedef u_int32_t sflt_flags; 82 83/*! 84 @typedef sflt_handle 85 @abstract A 4 byte identifier used with the SO_NKE socket option to 86 identify the socket filter to be attached. 87*/ 88typedef u_int32_t sflt_handle; 89 90/*! 91 @enum sflt_event_t 92 @abstract Events notify a filter of state changes and other various 93 events related to the socket. These events cannot be prevented 94 or intercepted, only observed. 95 @constant sock_evt_connected Indicates this socket has moved to the 96 connected state. 97 @constant sock_evt_disconnected Indicates this socket has moved to 98 the disconnected state. 99 @constant sock_evt_flush_read The read socket buffer has been 100 flushed. 101 @constant sock_evt_shutdown The read and or write side(s) of the 102 connection have been shutdown. The param will point to an 103 integer that indicates the direction that has been shutdown. See 104 'man 2 shutdown' for more information. 105 @constant sock_evt_cantrecvmore Indicates the socket cannot receive 106 more data. 107 @constant sock_evt_cantsendmore Indicates the socket cannot send 108 more data. 109 @constant sock_evt_closing Indicates the socket is closing. 110 @constant sock_evt_bound Indicates this socket has moved to the 111 bound state (only for PF_INET/PF_INET6 domain). 112*/ 113enum { 114 sock_evt_connecting = 1, 115 sock_evt_connected = 2, 116 sock_evt_disconnecting = 3, 117 sock_evt_disconnected = 4, 118 sock_evt_flush_read = 5, 119 sock_evt_shutdown = 6, /* param points to an integer specifying how (read, write, or both) see man 2 shutdown */ 120 sock_evt_cantrecvmore = 7, 121 sock_evt_cantsendmore = 8, 122 sock_evt_closing = 9, 123 sock_evt_bound = 10 124}; 125typedef u_int32_t sflt_event_t; 126 127/*! 128 @enum sflt_data_flag_t 129 @abstract Inbound and outbound data filters may handle many 130 different types of incoming and outgoing data. These flags help 131 distinguish between normal data, out-of-band data, and records. 132 @constant sock_data_filt_flag_oob Indicates this data is out-of-band 133 data. 134 @constant sock_data_filt_flag_record Indicates this data is a 135 record. This flag is only ever seen on inbound data. 136*/ 137enum { 138 sock_data_filt_flag_oob = 1, 139 sock_data_filt_flag_record = 2 140}; 141typedef u_int32_t sflt_data_flag_t; 142 143__BEGIN_DECLS 144 145/*! 146 @typedef sf_unregistered_func 147 148 @discussion sf_unregistered_func is called to notify the filter it 149 has been unregistered. This is the last function the stack will 150 call and this function will only be called once all other 151 function calls in to your filter have completed. Once this 152 function has been called, your kext may safely unload. 153 @param handle The socket filter handle used to identify this filter. 154*/ 155typedef void (*sf_unregistered_func)(sflt_handle handle); 156 157/*! 158 @typedef sf_attach_func 159 160 @discussion sf_attach_func is called to notify the filter it has 161 been attached to a socket. The filter may allocate memory for 162 this attachment and use the cookie to track it. This filter is 163 called in one of two cases: 164 1) You've installed a global filter and a new socket was created. 165 2) Your non-global socket filter is being attached using the SO_NKE 166 socket option. 167 @param cookie Used to allow the socket filter to set the cookie for 168 this attachment. 169 @param so The socket the filter is being attached to. 170 @result If you return a non-zero value, your filter will not be 171 attached to this socket. 172*/ 173typedef errno_t (*sf_attach_func)(void **cookie, socket_t so); 174 175/*! 176 @typedef sf_detach_func 177 178 @discussion sf_detach_func is called to notify the filter it has 179 been detached from a socket. If the filter allocated any memory 180 for this attachment, it should be freed. This function will 181 be called when the socket is disposed of. 182 @param cookie Cookie value specified when the filter attach was 183 called. 184 @param so The socket the filter is attached to. 185 @result If you return a non-zero value, your filter will not be 186 attached to this socket. 187*/ 188typedef void (*sf_detach_func)(void *cookie, socket_t so); 189 190/*! 191 @typedef sf_notify_func 192 193 @discussion sf_notify_func is called to notify the filter of various 194 state changes and other events occuring on the socket. 195 @param cookie Cookie value specified when the filter attach was 196 called. 197 @param so The socket the filter is attached to. 198 @param event The type of event that has occurred. 199 @param param Additional information about the event. 200*/ 201typedef void (*sf_notify_func)(void *cookie, socket_t so, sflt_event_t event, 202 void *param); 203 204/*! 205 @typedef sf_getpeername_func 206 207 @discussion sf_getpeername_func is called to allow a filter to 208 to intercept the getpeername function. When called, sa will 209 point to a pointer to a socket address that was malloced 210 in zone M_SONAME. If you want to replace this address, either 211 modify the currenty copy or allocate a new one and free the 212 old one. 213 @param cookie Cookie value specified when the filter attach was 214 called. 215 @param so The socket the filter is attached to. 216 @param sa A pointer to a socket address pointer. 217 @result If you return a non-zero value, processing will stop. If 218 you return EJUSTRETURN, no further filters will be called 219 but a result of zero will be returned to the caller of 220 getpeername. 221*/ 222typedef int (*sf_getpeername_func)(void *cookie, socket_t so, 223 struct sockaddr **sa); 224 225/*! 226 @typedef sf_getsockname_func 227 228 @discussion sf_getsockname_func is called to allow a filter to 229 to intercept the getsockname function. When called, sa will 230 point to a pointer to a socket address that was malloced 231 in zone M_SONAME. If you want to replace this address, either 232 modify the currenty copy or allocate a new one and free the 233 old one. 234 @param cookie Cookie value specified when the filter attach was 235 called. 236 @param so The socket the filter is attached to. 237 @param sa A pointer to a socket address pointer. 238 @result If you return a non-zero value, processing will stop. If 239 you return EJUSTRETURN, no further filters will be called 240 but a result of zero will be returned to the caller of 241 getsockname. 242*/ 243typedef int (*sf_getsockname_func)(void *cookie, socket_t so, 244 struct sockaddr **sa); 245 246/*! 247 @typedef sf_data_in_func 248 249 @discussion sf_data_in_func is called to filter incoming data. If your 250 filter intercepts data for later reinjection, it must queue 251 all incoming data to preserve the order of the data. Use 252 sock_inject_data_in to later reinject this data if you return 253 EJUSTRETURN. Warning: This filter is on the data path. Do not 254 spend excesive time. Do not wait for data on another socket. 255 @param cookie Cookie value specified when the filter attach was 256 called. 257 @param so The socket the filter is attached to. 258 @param from The addres the data is from, may be NULL if the socket 259 is connected. 260 @param data The data being received. Control data may appear in the 261 mbuf chain, be sure to check the mbuf types to find control 262 data. 263 @param control Control data being passed separately from the data. 264 @param flags Flags to indicate if this is out of band data or a 265 record. 266 @result Return: 267 0 - The caller will continue with normal processing of the data. 268 EJUSTRETURN - The caller will stop processing the data, the 269 data will not be freed. 270 Anything Else - The caller will free the data and stop 271 processing. 272*/ 273typedef errno_t (*sf_data_in_func)(void *cookie, socket_t so, 274 const struct sockaddr *from, mbuf_t *data, mbuf_t *control, 275 sflt_data_flag_t flags); 276 277/*! 278 @typedef sf_data_out_func 279 280 @discussion sf_data_out_func is called to filter outbound data. If 281 your filter intercepts data for later reinjection, it must queue 282 all outbound data to preserve the order of the data when 283 reinjecting. Use sock_inject_data_out to later reinject this 284 data. 285 @param cookie Cookie value specified when the filter attach was 286 called. 287 @param so The socket the filter is attached to. 288 @param from The address the data is from, may be NULL if the socket 289 is connected. 290 @param data The data being received. Control data may appear in the 291 mbuf chain, be sure to check the mbuf types to find control 292 data. 293 @param control Control data being passed separately from the data. 294 @param flags Flags to indicate if this is out of band data or a 295 record. 296 @result Return: 297 0 - The caller will continue with normal processing of the data. 298 EJUSTRETURN - The caller will stop processing the data, 299 the data will not be freed. 300 Anything Else - The caller will free the data and stop 301 processing. 302*/ 303typedef errno_t (*sf_data_out_func)(void *cookie, socket_t so, 304 const struct sockaddr *to, mbuf_t *data, mbuf_t *control, 305 sflt_data_flag_t flags); 306 307/*! 308 @typedef sf_connect_in_func 309 310 @discussion sf_connect_in_func is called to filter inbound connections. 311 A protocol will call this before accepting an incoming 312 connection and placing it on the queue of completed connections. 313 Warning: This filter is on the data path. Do not spend excesive 314 time. Do not wait for data on another socket. 315 @param cookie Cookie value specified when the filter attach was 316 called. 317 @param so The socket the filter is attached to. 318 @param from The address the incoming connection is from. 319 @result Return: 320 0 - The caller will continue with normal processing of the 321 connection. 322 Anything Else - The caller will rejecting the incoming 323 connection. 324*/ 325typedef errno_t (*sf_connect_in_func)(void *cookie, socket_t so, 326 const struct sockaddr *from); 327 328/*! 329 @typedef sf_connect_out_func 330 331 @discussion sf_connect_out_func is called to filter outbound 332 connections. A protocol will call this before initiating an 333 outbound connection. 334 @param cookie Cookie value specified when the filter attach was 335 called. 336 @param so The socket the filter is attached to. 337 @param to The remote address of the outbound connection. 338 @result Return: 339 0 - The caller will continue with normal processing of the 340 connection. 341 Anything Else - The caller will rejecting the outbound 342 connection. 343*/ 344typedef errno_t (*sf_connect_out_func)(void *cookie, socket_t so, 345 const struct sockaddr *to); 346 347/*! 348 @typedef sf_bind_func 349 350 @discussion sf_bind_func is called before performing a bind 351 operation on a socket. 352 @param cookie Cookie value specified when the filter attach was 353 called. 354 @param so The socket the filter is attached to. 355 @param to The local address of the socket will be bound to. 356 @result Return: 357 0 - The caller will continue with normal processing of the bind. 358 Anything Else - The caller will rejecting the bind. 359*/ 360typedef errno_t (*sf_bind_func)(void *cookie, socket_t so, 361 const struct sockaddr *to); 362 363/*! 364 @typedef sf_setoption_func 365 366 @discussion sf_setoption_func is called before performing setsockopt 367 on a socket. 368 @param cookie Cookie value specified when the filter attach was 369 called. 370 @param so The socket the filter is attached to. 371 @param opt The socket option to set. 372 @result Return: 373 0 - The caller will continue with normal processing of the 374 setsockopt. 375 Anything Else - The caller will stop processing and return 376 this error. 377*/ 378typedef errno_t (*sf_setoption_func)(void *cookie, socket_t so, sockopt_t opt); 379 380/*! 381 @typedef sf_getoption_func 382 383 @discussion sf_getoption_func is called before performing getsockopt 384 on a socket. 385 @param cookie Cookie value specified when the filter attach was 386 called. 387 @param so The socket the filter is attached to. 388 @param opt The socket option to get. 389 @result Return: 390 0 - The caller will continue with normal processing of the 391 getsockopt. 392 Anything Else - The caller will stop processing and return 393 this error. 394*/ 395typedef errno_t (*sf_getoption_func)(void *cookie, socket_t so, sockopt_t opt); 396 397/*! 398 @typedef sf_listen_func 399 400 @discussion sf_listen_func is called before performing listen 401 on a socket. 402 @param cookie Cookie value specified when the filter attach was 403 called. 404 @param so The socket the filter is attached to. 405 @result Return: 406 0 - The caller will continue with normal processing of listen. 407 Anything Else - The caller will stop processing and return 408 this error. 409*/ 410typedef errno_t (*sf_listen_func)(void *cookie, socket_t so); 411 412/*! 413 @typedef sf_ioctl_func 414 415 @discussion sf_ioctl_func is called before performing an ioctl 416 on a socket. 417 418 All undefined ioctls are reserved for future use by Apple. If 419 you need to communicate with your kext using an ioctl, please 420 use SIOCSIFKPI and SIOCGIFKPI. 421 @param cookie Cookie value specified when the filter attach was 422 called. 423 @param so The socket the filter is attached to. 424 @param request The ioctl name. 425 @param argp A pointer to the ioctl parameter. 426 @result Return: 427 0 - The caller will continue with normal processing of 428 this ioctl. 429 Anything Else - The caller will stop processing and return 430 this error. 431*/ 432typedef errno_t (*sf_ioctl_func)(void *cookie, socket_t so, 433 unsigned long request, const char* argp); 434 435/*! 436 @typedef sf_accept_func 437 438 @discussion sf_accept_func is called after a socket is dequeued 439 off the completed (incoming) connection list and before 440 the file descriptor is associated with it. A filter can 441 utilize this callback to intercept the accepted socket 442 in order to examine it, prior to returning the socket to 443 the caller of accept. Such a filter may also choose to 444 discard the accepted socket if it wishes to do so. 445 @param cookie Cookie value specified when the filter attach was called. 446 @param so_listen The listening socket. 447 @param so The socket that is about to be accepted. 448 @param local The local address of the about to be accepted socket. 449 @param remote The remote address of the about to be accepted socket. 450 @result Return: 451 0 - The caller will continue with normal processing of accept. 452 EJUSTRETURN - The to be accepted socket will be disconnected 453 prior to being returned to the caller of accept. No further 454 control or data operations on the socket will be allowed. 455 This is the recommended return value as it has the least 456 amount of impact, especially to applications which don't 457 check the error value returned by accept. 458 Anything Else - The to be accepted socket will be closed and 459 the error will be returned to the caller of accept. 460 Note that socket filter developers are advised to exercise 461 caution when returning non-zero values to the caller, 462 since some applications don't check the error value 463 returned by accept and therefore risk breakage. 464 */ 465typedef errno_t (*sf_accept_func)(void *cookie, socket_t so_listen, socket_t so, 466 const struct sockaddr *local, const struct sockaddr *remote); 467 468/*! 469 @struct sflt_filter 470 @discussion This structure is used to define a socket filter. 471 @field sf_handle A value used to find socket filters by 472 applications. An application can use this value to specify that 473 this filter should be attached when using the SO_NKE socket 474 option. 475 @field sf_flags Indicate whether this filter should be attached to 476 all new sockets or just those that request the filter be 477 attached using the SO_NKE socket option. If this filter 478 utilizes the socket filter extension fields, it must also 479 set SFLT_EXTENDED. 480 @field sf_name A name used for debug purposes. 481 @field sf_unregistered Your function for being notified when your 482 filter has been unregistered. 483 @field sf_attach Your function for handling attaches to sockets. 484 @field sf_detach Your function for handling detaches from sockets. 485 @field sf_notify Your function for handling events. May be null. 486 @field sf_data_in Your function for handling incoming data. May be 487 null. 488 @field sf_data_out Your function for handling outgoing data. May be 489 null. 490 @field sf_connect_in Your function for handling inbound 491 connections. May be null. 492 @field sf_connect_out Your function for handling outbound 493 connections. May be null. 494 @field sf_bind Your function for handling binds. May be null. 495 @field sf_setoption Your function for handling setsockopt. May be null. 496 @field sf_getoption Your function for handling getsockopt. May be null. 497 @field sf_listen Your function for handling listen. May be null. 498 @field sf_ioctl Your function for handling ioctls. May be null. 499 @field sf_len Length of socket filter extension structure; developers 500 must initialize this to sizeof sflt_filter_ext structure. 501 This field and all fields following it will only be valid 502 if SFLT_EXTENDED flag is set in sf_flags field. 503 @field sf_ext_accept Your function for handling inbound connections 504 at accept time. May be null. 505 @field sf_ext_rsvd Reserved for future use; you must initialize 506 the reserved fields with zeroes. 507*/ 508struct sflt_filter { 509 sflt_handle sf_handle; 510 int sf_flags; 511 char *sf_name; 512 513 sf_unregistered_func sf_unregistered; 514 sf_attach_func sf_attach; 515 sf_detach_func sf_detach; 516 517 sf_notify_func sf_notify; 518 sf_getpeername_func sf_getpeername; 519 sf_getsockname_func sf_getsockname; 520 sf_data_in_func sf_data_in; 521 sf_data_out_func sf_data_out; 522 sf_connect_in_func sf_connect_in; 523 sf_connect_out_func sf_connect_out; 524 sf_bind_func sf_bind; 525 sf_setoption_func sf_setoption; 526 sf_getoption_func sf_getoption; 527 sf_listen_func sf_listen; 528 sf_ioctl_func sf_ioctl; 529 /* 530 * The following are valid only if SFLT_EXTENDED flag is set. 531 * Initialize sf_ext_len to sizeof sflt_filter_ext structure. 532 * Filters must also initialize reserved fields with zeroes. 533 */ 534 struct sflt_filter_ext { 535 unsigned int sf_ext_len; 536 sf_accept_func sf_ext_accept; 537 void *sf_ext_rsvd[5]; /* Reserved */ 538 } sf_ext; 539#define sf_len sf_ext.sf_ext_len 540#define sf_accept sf_ext.sf_ext_accept 541}; 542 543/*! 544 @function sflt_register 545 @discussion Registers a socket filter. See 'man 2 socket' for a 546 desciption of domain, type, and protocol. 547 @param filter A structure describing the filter. 548 @param domain The protocol domain these filters will be attached to. 549 @param type The socket type these filters will be attached to. 550 @param protocol The protocol these filters will be attached to. 551 @result 0 on success otherwise the errno error. 552 */ 553extern errno_t sflt_register(const struct sflt_filter *filter, int domain, 554 int type, int protocol); 555 556/*! 557 @function sflt_unregister 558 @discussion Unregisters a socket filter. This will not detach the 559 socket filter from all sockets it may be attached to at the 560 time, it will just prevent the socket filter from being attached 561 to any new sockets. 562 @param handle The sf_handle of the socket filter to unregister. 563 @result 0 on success otherwise the errno error. 564 */ 565extern errno_t sflt_unregister(sflt_handle handle); 566 567/*! 568 @function sflt_attach 569 @discussion Attaches a socket filter to the specified socket. A 570 filter must be registered before it can be attached. 571 @param socket The socket the filter should be attached to. 572 @param handle The handle of the registered filter to be attached. 573 @result 0 on success otherwise the errno error. 574 */ 575extern errno_t sflt_attach(socket_t so, sflt_handle); 576 577/*! 578 @function sflt_detach 579 @discussion Detaches a socket filter from a specified socket. 580 @param socket The socket the filter should be detached from. 581 @param handle The handle of the registered filter to be detached. 582 @result 0 on success otherwise the errno error. 583 */ 584extern errno_t sflt_detach(socket_t so, sflt_handle); 585 586/* Functions for manipulating sockets */ 587/* 588 * Inject data in to the receive buffer of the socket as if it 589 * had come from the network. 590 * 591 * flags should match sflt_data_flag_t 592 */ 593 594/*! 595 @function sock_inject_data_in 596 @discussion Inject data in to the receive buffer of the socket as if 597 it had come from the network. 598 @param so The socket to inject the data on. 599 @param from The address the data is from, only necessary on 600 un-connected sockets. A copy of the address will be made, caller 601 is responsible for freeing the address after calling this 602 function. 603 @param data The data and possibly control mbufs. 604 @param control The separate control mbufs. 605 @param flags Flags indicating the type of data. 606 @result 0 on success otherwise the errno error. If the function 607 returns an error, the caller is responsible for freeing the 608 mbuf. 609 */ 610extern errno_t sock_inject_data_in(socket_t so, const struct sockaddr *from, 611 mbuf_t data, mbuf_t control, sflt_data_flag_t flags); 612 613/*! 614 @function sock_inject_data_out 615 @discussion Inject data in to the send buffer of the socket as if it 616 had come from the client. 617 @param so The socket to inject the data on. 618 @param to The address the data should be sent to, only necessary on 619 un-connected sockets. The caller is responsible for freeing the 620 to address after sock_inject_data_out returns. 621 @param data The data and possibly control mbufs. 622 @param control The separate control mbufs. 623 @param flags Flags indicating the type of data. 624 @result 0 on success otherwise the errno error. The data and control 625 values are always freed regardless of return value. 626 */ 627extern errno_t sock_inject_data_out(socket_t so, const struct sockaddr *to, 628 mbuf_t data, mbuf_t control, sflt_data_flag_t flags); 629 630 631/* 632 * sockopt_t accessors 633 */ 634 635enum { 636 sockopt_get = 1, 637 sockopt_set = 2 638}; 639typedef u_int8_t sockopt_dir; 640 641/*! 642 @function sockopt_direction 643 @discussion Retrieves the direction of the socket option (Get or 644 Set). 645 @param sopt The socket option. 646 @result sock_opt_get or sock_opt_set. 647 */ 648extern sockopt_dir sockopt_direction(sockopt_t sopt); 649 650/*! 651 @function sockopt_level 652 @discussion Retrieves the socket option level. (SOL_SOCKET, etc). 653 @param sopt The socket option. 654 @result The socket option level. See man 2 setsockopt 655 */ 656extern int sockopt_level(sockopt_t sopt); 657 658/*! 659 @function sockopt_name 660 @discussion Retrieves the socket option name. (SO_SNDBUF, etc). 661 @param sopt The socket option. 662 @result The socket option name. See man 2 setsockopt 663 */ 664extern int sockopt_name(sockopt_t sopt); 665 666/*! 667 @function sockopt_valsize 668 @discussion Retrieves the size of the socket option data. 669 @param sopt The socket option. 670 @result The length, in bytes, of the data. 671 */ 672extern size_t sockopt_valsize(sockopt_t sopt); 673 674/*! 675 @function sockopt_copyin 676 @discussion Copies the data from the socket option to a buffer. 677 @param sopt The socket option. 678 @param data A pointer to the buffer to copy the data in to. 679 @param length The number of bytes to copy. 680 @result An errno error or zero upon success. 681 */ 682extern errno_t sockopt_copyin(sockopt_t sopt, void *data, size_t length); 683 684/*! 685 @function sockopt_copyout 686 @discussion Copies the data from a buffer to a socket option. 687 @param sopt The socket option. 688 @param data A pointer to the buffer to copy the data out of. 689 @param length The number of bytes to copy. 690 @result An errno error or zero upon success. 691 */ 692extern errno_t sockopt_copyout(sockopt_t sopt, void *data, size_t length); 693 694__END_DECLS 695#endif /* __KPI_SOCKETFILTER__ */ 696