1 /* $NetBSD: socketvar.h,v 1.140 2016/06/01 04:15:54 pgoyette Exp $ */
2
3 /*-
4 * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Doran.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*-
33 * Copyright (c) 1982, 1986, 1990, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
61 */
62
63 #ifndef _SYS_SOCKETVAR_H_
64 #define _SYS_SOCKETVAR_H_
65
66 #include <sys/select.h>
67 #include <sys/selinfo.h> /* for struct selinfo */
68 #include <sys/queue.h>
69 #include <sys/mutex.h>
70 #include <sys/condvar.h>
71
72 #if !defined(_KERNEL)
73 struct uio;
74 struct lwp;
75 struct uidinfo;
76 #else
77 #include <sys/uidinfo.h>
78 #endif
79
80 TAILQ_HEAD(soqhead, socket);
81
82 /*
83 * Variables for socket buffering.
84 */
85 struct sockbuf {
86 struct selinfo sb_sel; /* process selecting read/write */
87 struct mowner *sb_mowner; /* who owns data for this sockbuf */
88 struct socket *sb_so; /* back pointer to socket */
89 kcondvar_t sb_cv; /* notifier */
90 /* When re-zeroing this struct, we zero from sb_startzero to the end */
91 #define sb_startzero sb_cc
92 u_long sb_cc; /* actual chars in buffer */
93 u_long sb_hiwat; /* max actual char count */
94 u_long sb_mbcnt; /* chars of mbufs used */
95 u_long sb_mbmax; /* max chars of mbufs to use */
96 long sb_lowat; /* low water mark */
97 struct mbuf *sb_mb; /* the mbuf chain */
98 struct mbuf *sb_mbtail; /* the last mbuf in the chain */
99 struct mbuf *sb_lastrecord; /* first mbuf of last record in
100 socket buffer */
101 int sb_flags; /* flags, see below */
102 int sb_timeo; /* timeout for read/write */
103 u_long sb_overflowed; /* # of drops due to full buffer */
104 };
105
106 #ifndef SB_MAX
107 #define SB_MAX (256*1024) /* default for max chars in sockbuf */
108 #endif
109
110 #define SB_LOCK 0x01 /* lock on data queue */
111 #define SB_NOTIFY 0x04 /* someone is waiting for data/space */
112 #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
113 #define SB_UPCALL 0x20 /* someone wants an upcall */
114 #define SB_NOINTR 0x40 /* operations not interruptible */
115 #define SB_KNOTE 0x100 /* kernel note attached */
116 #define SB_AUTOSIZE 0x800 /* automatically size socket buffer */
117
118 /*
119 * Kernel structure per socket.
120 * Contains send and receive buffer queues,
121 * handle on protocol and pointer to protocol
122 * private data and error information.
123 */
124 struct so_accf {
125 struct accept_filter *so_accept_filter;
126 void *so_accept_filter_arg; /* saved filter args */
127 char *so_accept_filter_str; /* saved user args */
128 };
129
130 struct sockaddr;
131
132 struct socket {
133 kmutex_t * volatile so_lock; /* pointer to lock on structure */
134 kcondvar_t so_cv; /* notifier */
135 short so_type; /* generic type, see socket.h */
136 short so_options; /* from socket call, see socket.h */
137 u_short so_linger; /* time to linger while closing */
138 short so_state; /* internal state flags SS_*, below */
139 int so_unused; /* used to be so_nbio */
140 void *so_pcb; /* protocol control block */
141 const struct protosw *so_proto; /* protocol handle */
142 /*
143 * Variables for connection queueing.
144 * Socket where accepts occur is so_head in all subsidiary sockets.
145 * If so_head is 0, socket is not related to an accept.
146 * For head socket so_q0 queues partially completed connections,
147 * while so_q is a queue of connections ready to be accepted.
148 * If a connection is aborted and it has so_head set, then
149 * it has to be pulled out of either so_q0 or so_q.
150 * We allow connections to queue up based on current queue lengths
151 * and limit on number of queued connections for this socket.
152 */
153 struct socket *so_head; /* back pointer to accept socket */
154 struct soqhead *so_onq; /* queue (q or q0) that we're on */
155 struct soqhead so_q0; /* queue of partial connections */
156 struct soqhead so_q; /* queue of incoming connections */
157 TAILQ_ENTRY(socket) so_qe; /* our queue entry (q or q0) */
158 short so_q0len; /* partials on so_q0 */
159 short so_qlen; /* number of connections on so_q */
160 short so_qlimit; /* max number queued connections */
161 short so_timeo; /* connection timeout */
162 u_short so_error; /* error affecting connection */
163 u_short so_aborting; /* references from soabort() */
164 pid_t so_pgid; /* pgid for signals */
165 u_long so_oobmark; /* chars to oob mark */
166 struct sockbuf so_snd; /* send buffer */
167 struct sockbuf so_rcv; /* receive buffer */
168
169 void *so_internal; /* Space for svr4 stream data */
170 void (*so_upcall) (struct socket *, void *, int, int);
171 void * so_upcallarg; /* Arg for above */
172 int (*so_send) (struct socket *, struct sockaddr *,
173 struct uio *, struct mbuf *,
174 struct mbuf *, int, struct lwp *);
175 int (*so_receive) (struct socket *,
176 struct mbuf **,
177 struct uio *, struct mbuf **,
178 struct mbuf **, int *);
179 struct mowner *so_mowner; /* who owns mbufs for this socket */
180 struct uidinfo *so_uidinfo; /* who opened the socket */
181 gid_t so_egid; /* creator effective gid */
182 pid_t so_cpid; /* creator pid */
183 struct so_accf *so_accf;
184 kauth_cred_t so_cred; /* socket credentials */
185 };
186
187 /*
188 * Socket state bits.
189 */
190 #define SS_NOFDREF 0x001 /* no file table ref any more */
191 #define SS_ISCONNECTED 0x002 /* socket connected to a peer */
192 #define SS_ISCONNECTING 0x004 /* in process of connecting to peer */
193 #define SS_ISDISCONNECTING 0x008 /* in process of disconnecting */
194 #define SS_CANTSENDMORE 0x010 /* can't send more data to peer */
195 #define SS_CANTRCVMORE 0x020 /* can't receive more data from peer */
196 #define SS_RCVATMARK 0x040 /* at mark on input */
197 #define SS_ISABORTING 0x080 /* aborting fd references - close() */
198 #define SS_RESTARTSYS 0x100 /* restart blocked system calls */
199 #define SS_ISDISCONNECTED 0x800 /* socket disconnected from peer */
200
201 #define SS_ASYNC 0x100 /* async i/o notify */
202 #define SS_MORETOCOME 0x400 /*
203 * hint from sosend to lower layer;
204 * more data coming
205 */
206 #define SS_ISAPIPE 0x1000 /* socket is implementing a pipe */
207 #define SS_NBIO 0x2000 /* socket is in non blocking I/O */
208
209 #ifdef _KERNEL
210
211 struct accept_filter {
212 char accf_name[16];
213 void (*accf_callback)
214 (struct socket *, void *, int, int);
215 void * (*accf_create)
216 (struct socket *, char *);
217 void (*accf_destroy)
218 (struct socket *);
219 LIST_ENTRY(accept_filter) accf_next;
220 u_int accf_refcnt;
221 };
222
223 struct sockopt {
224 int sopt_level; /* option level */
225 int sopt_name; /* option name */
226 size_t sopt_size; /* data length */
227 void * sopt_data; /* data pointer */
228 uint8_t sopt_buf[sizeof(int)]; /* internal storage */
229 };
230
231 #define SB_EMPTY_FIXUP(sb) \
232 do { \
233 KASSERT(solocked((sb)->sb_so)); \
234 if ((sb)->sb_mb == NULL) { \
235 (sb)->sb_mbtail = NULL; \
236 (sb)->sb_lastrecord = NULL; \
237 } \
238 } while (/*CONSTCOND*/0)
239
240 extern u_long sb_max;
241 extern int somaxkva;
242 extern int sock_loan_thresh;
243 extern kmutex_t *softnet_lock;
244
245 struct mbuf;
246 struct lwp;
247 struct msghdr;
248 struct stat;
249 struct knote;
250
251 struct mbuf *getsombuf(struct socket *, int);
252
253 /*
254 * File operations on sockets.
255 */
256 int soo_read(file_t *, off_t *, struct uio *, kauth_cred_t, int);
257 int soo_write(file_t *, off_t *, struct uio *, kauth_cred_t, int);
258 int soo_fcntl(file_t *, u_int cmd, void *);
259 int soo_ioctl(file_t *, u_long cmd, void *);
260 int soo_poll(file_t *, int);
261 int soo_kqfilter(file_t *, struct knote *);
262 int soo_close(file_t *);
263 int soo_stat(file_t *, struct stat *);
264 void soo_restart(file_t *);
265 void sbappend(struct sockbuf *, struct mbuf *);
266 void sbappendstream(struct sockbuf *, struct mbuf *);
267 int sbappendaddr(struct sockbuf *, const struct sockaddr *, struct mbuf *,
268 struct mbuf *);
269 int sbappendaddrchain(struct sockbuf *, const struct sockaddr *,
270 struct mbuf *, int);
271 int sbappendcontrol(struct sockbuf *, struct mbuf *, struct mbuf *);
272 void sbappendrecord(struct sockbuf *, struct mbuf *);
273 void sbcheck(struct sockbuf *);
274 void sbcompress(struct sockbuf *, struct mbuf *, struct mbuf *);
275 struct mbuf *
276 sbcreatecontrol(void *, int, int, int);
277 struct mbuf *
278 sbcreatecontrol1(void **, int, int, int, int);
279 void sbdrop(struct sockbuf *, int);
280 void sbdroprecord(struct sockbuf *);
281 void sbflush(struct sockbuf *);
282 void sbinsertoob(struct sockbuf *, struct mbuf *);
283 void sbrelease(struct sockbuf *, struct socket *);
284 int sbreserve(struct sockbuf *, u_long, struct socket *);
285 int sbwait(struct sockbuf *);
286 int sb_max_set(u_long);
287 void soinit(void);
288 void soinit1(void);
289 void soinit2(void);
290 int soabort(struct socket *);
291 int soaccept(struct socket *, struct sockaddr *);
292 int sofamily(const struct socket *);
293 int sobind(struct socket *, struct sockaddr *, struct lwp *);
294 void socantrcvmore(struct socket *);
295 void socantsendmore(struct socket *);
296 int soclose(struct socket *);
297 int soconnect(struct socket *, struct sockaddr *, struct lwp *);
298 int soconnect2(struct socket *, struct socket *);
299 int socreate(int, struct socket **, int, int, struct lwp *,
300 struct socket *);
301 int fsocreate(int, struct socket **, int, int, int *);
302 int sodisconnect(struct socket *);
303 void sofree(struct socket *);
304 int sogetopt(struct socket *, struct sockopt *);
305 void sohasoutofband(struct socket *);
306 void soisconnected(struct socket *);
307 void soisconnecting(struct socket *);
308 void soisdisconnected(struct socket *);
309 void soisdisconnecting(struct socket *);
310 int solisten(struct socket *, int, struct lwp *);
311 struct socket *
312 sonewconn(struct socket *, bool);
313 void soqinsque(struct socket *, struct socket *, int);
314 bool soqremque(struct socket *, int);
315 int soreceive(struct socket *, struct mbuf **, struct uio *,
316 struct mbuf **, struct mbuf **, int *);
317 int soreserve(struct socket *, u_long, u_long);
318 void sorflush(struct socket *);
319 int sosend(struct socket *, struct sockaddr *, struct uio *,
320 struct mbuf *, struct mbuf *, int, struct lwp *);
321 int sosetopt(struct socket *, struct sockopt *);
322 int so_setsockopt(struct lwp *, struct socket *, int, int, const void *, size_t);
323 int soshutdown(struct socket *, int);
324 void sorestart(struct socket *);
325 void sowakeup(struct socket *, struct sockbuf *, int);
326 int sockargs(struct mbuf **, const void *, size_t, int);
327 int sopoll(struct socket *, int);
328 struct socket *soget(bool);
329 void soput(struct socket *);
330 bool solocked(struct socket *);
331 bool solocked2(struct socket *, struct socket *);
332 int sblock(struct sockbuf *, int);
333 void sbunlock(struct sockbuf *);
334 int sowait(struct socket *, bool, int);
335 void solockretry(struct socket *, kmutex_t *);
336 void sosetlock(struct socket *);
337 void solockreset(struct socket *, kmutex_t *);
338
339 void sockopt_init(struct sockopt *, int, int, size_t);
340 void sockopt_destroy(struct sockopt *);
341 int sockopt_set(struct sockopt *, const void *, size_t);
342 int sockopt_setint(struct sockopt *, int);
343 int sockopt_get(const struct sockopt *, void *, size_t);
344 int sockopt_getint(const struct sockopt *, int *);
345 int sockopt_setmbuf(struct sockopt *, struct mbuf *);
346 struct mbuf *sockopt_getmbuf(const struct sockopt *);
347
348 int copyout_sockname(struct sockaddr *, unsigned int *, int, struct mbuf *);
349 int copyout_msg_control(struct lwp *, struct msghdr *, struct mbuf *);
350 void free_control_mbuf(struct lwp *, struct mbuf *, struct mbuf *);
351
352 int do_sys_getpeername(int, struct sockaddr *);
353 int do_sys_getsockname(int, struct sockaddr *);
354 int do_sys_sendmsg(struct lwp *, int, struct msghdr *, int, register_t *);
355 int do_sys_recvmsg(struct lwp *, int, struct msghdr *, struct mbuf **,
356 struct mbuf **, register_t *);
357
358 int do_sys_bind(struct lwp *, int, struct sockaddr *);
359 int do_sys_connect(struct lwp *, int, struct sockaddr *);
360 int do_sys_accept(struct lwp *, int, struct sockaddr *, register_t *,
361 const sigset_t *, int, int);
362
363 /*
364 * Inline functions for sockets and socket buffering.
365 */
366
367 #include <sys/protosw.h>
368 #include <sys/mbuf.h>
369
370 /*
371 * Do we need to notify the other side when I/O is possible?
372 */
373 static inline int
sb_notify(struct sockbuf * sb)374 sb_notify(struct sockbuf *sb)
375 {
376
377 KASSERT(solocked(sb->sb_so));
378
379 return sb->sb_flags & (SB_NOTIFY | SB_ASYNC | SB_UPCALL | SB_KNOTE);
380 }
381
382 /*
383 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
384 * This is problematical if the fields are unsigned, as the space might
385 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
386 * overflow and return 0.
387 */
388 static inline long
sbspace(struct sockbuf * sb)389 sbspace(struct sockbuf *sb)
390 {
391
392 KASSERT(solocked(sb->sb_so));
393
394 return lmin(sb->sb_hiwat - sb->sb_cc, sb->sb_mbmax - sb->sb_mbcnt);
395 }
396
397 /* do we have to send all at once on a socket? */
398 static inline int
sosendallatonce(struct socket * so)399 sosendallatonce(struct socket *so)
400 {
401
402 return so->so_proto->pr_flags & PR_ATOMIC;
403 }
404
405 /* can we read something from so? */
406 static inline int
soreadable(struct socket * so)407 soreadable(struct socket *so)
408 {
409
410 KASSERT(solocked(so));
411
412 return so->so_rcv.sb_cc >= so->so_rcv.sb_lowat ||
413 (so->so_state & SS_CANTRCVMORE) != 0 ||
414 so->so_qlen != 0 || so->so_error != 0;
415 }
416
417 /* can we write something to so? */
418 static inline int
sowritable(struct socket * so)419 sowritable(struct socket *so)
420 {
421
422 KASSERT(solocked(so));
423
424 return (sbspace(&so->so_snd) >= so->so_snd.sb_lowat &&
425 ((so->so_state & SS_ISCONNECTED) != 0 ||
426 (so->so_proto->pr_flags & PR_CONNREQUIRED) == 0)) ||
427 (so->so_state & SS_CANTSENDMORE) != 0 ||
428 so->so_error != 0;
429 }
430
431 /* adjust counters in sb reflecting allocation of m */
432 static inline void
sballoc(struct sockbuf * sb,struct mbuf * m)433 sballoc(struct sockbuf *sb, struct mbuf *m)
434 {
435
436 KASSERT(solocked(sb->sb_so));
437
438 sb->sb_cc += m->m_len;
439 sb->sb_mbcnt += MSIZE;
440 if (m->m_flags & M_EXT)
441 sb->sb_mbcnt += m->m_ext.ext_size;
442 }
443
444 /* adjust counters in sb reflecting freeing of m */
445 static inline void
sbfree(struct sockbuf * sb,struct mbuf * m)446 sbfree(struct sockbuf *sb, struct mbuf *m)
447 {
448
449 KASSERT(solocked(sb->sb_so));
450
451 sb->sb_cc -= m->m_len;
452 sb->sb_mbcnt -= MSIZE;
453 if (m->m_flags & M_EXT)
454 sb->sb_mbcnt -= m->m_ext.ext_size;
455 }
456
457 static inline void
sorwakeup(struct socket * so)458 sorwakeup(struct socket *so)
459 {
460
461 KASSERT(solocked(so));
462
463 if (sb_notify(&so->so_rcv))
464 sowakeup(so, &so->so_rcv, POLL_IN);
465 }
466
467 static inline void
sowwakeup(struct socket * so)468 sowwakeup(struct socket *so)
469 {
470
471 KASSERT(solocked(so));
472
473 if (sb_notify(&so->so_snd))
474 sowakeup(so, &so->so_snd, POLL_OUT);
475 }
476
477 static inline void
solock(struct socket * so)478 solock(struct socket *so)
479 {
480 kmutex_t *lock;
481
482 lock = so->so_lock;
483 mutex_enter(lock);
484 if (__predict_false(lock != so->so_lock))
485 solockretry(so, lock);
486 }
487
488 static inline void
sounlock(struct socket * so)489 sounlock(struct socket *so)
490 {
491
492 mutex_exit(so->so_lock);
493 }
494
495 #ifdef SOCKBUF_DEBUG
496 /*
497 * SBLASTRECORDCHK: check sb->sb_lastrecord is maintained correctly.
498 * SBLASTMBUFCHK: check sb->sb_mbtail is maintained correctly.
499 *
500 * => panic if the socket buffer is inconsistent.
501 * => 'where' is used for a panic message.
502 */
503 void sblastrecordchk(struct sockbuf *, const char *);
504 #define SBLASTRECORDCHK(sb, where) sblastrecordchk((sb), (where))
505
506 void sblastmbufchk(struct sockbuf *, const char *);
507 #define SBLASTMBUFCHK(sb, where) sblastmbufchk((sb), (where))
508 #define SBCHECK(sb) sbcheck(sb)
509 #else
510 #define SBLASTRECORDCHK(sb, where) /* nothing */
511 #define SBLASTMBUFCHK(sb, where) /* nothing */
512 #define SBCHECK(sb) /* nothing */
513 #endif /* SOCKBUF_DEBUG */
514
515 /* sosend loan */
516 vaddr_t sokvaalloc(vaddr_t, vsize_t, struct socket *);
517 void sokvafree(vaddr_t, vsize_t);
518 void soloanfree(struct mbuf *, void *, size_t, void *);
519
520 /*
521 * Values for socket-buffer-append priority argument to sbappendaddrchain().
522 * The following flags are reserved for future implementation:
523 *
524 * SB_PRIO_NONE: honour normal socket-buffer limits.
525 *
526 * SB_PRIO_ONESHOT_OVERFLOW: if the socket has any space,
527 * deliver the entire chain. Intended for large requests
528 * that should be delivered in their entirety, or not at all.
529 *
530 * SB_PRIO_OVERDRAFT: allow a small (2*MLEN) overflow, over and
531 * aboce normal socket limits. Intended messages indicating
532 * buffer overflow in earlier normal/lower-priority messages .
533 *
534 * SB_PRIO_BESTEFFORT: Ignore limits entirely. Intended only for
535 * kernel-generated messages to specially-marked scokets which
536 * require "reliable" delivery, nd where the source socket/protocol
537 * message generator enforce some hard limit (but possibly well
538 * above kern.sbmax). It is entirely up to the in-kernel source to
539 * avoid complete mbuf exhaustion or DoS scenarios.
540 */
541 #define SB_PRIO_NONE 0
542 #define SB_PRIO_ONESHOT_OVERFLOW 1
543 #define SB_PRIO_OVERDRAFT 2
544 #define SB_PRIO_BESTEFFORT 3
545
546 /*
547 * Accept filter functions (duh).
548 */
549 int accept_filt_getopt(struct socket *, struct sockopt *);
550 int accept_filt_setopt(struct socket *, const struct sockopt *);
551 int accept_filt_clear(struct socket *);
552 int accept_filt_add(struct accept_filter *);
553 int accept_filt_del(struct accept_filter *);
554 struct accept_filter *accept_filt_get(char *);
555 #ifdef ACCEPT_FILTER_MOD
556 #ifdef SYSCTL_DECL
557 SYSCTL_DECL(_net_inet_accf);
558 #endif
559 void accept_filter_init(void);
560 #endif
561
562 #endif /* _KERNEL */
563
564 #endif /* !_SYS_SOCKETVAR_H_ */
565