1/* $NetBSD: socketvar.h,v 1.171 2025/04/07 21:02:19 andvar 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)
73struct uio;
74struct lwp;
75struct uidinfo;
76#else
77#include <sys/atomic.h>
78#include <sys/uidinfo.h>
79#endif
80
81TAILQ_HEAD(soqhead, socket);
82
83/*
84 * Variables for socket buffering.
85 */
86struct sockbuf {
87 struct selinfo sb_sel; /* process selecting read/write */
88 struct mowner *sb_mowner; /* who owns data for this sockbuf */
89 struct socket *sb_so; /* back pointer to socket */
90 kcondvar_t sb_cv; /* notifier */
91 /* When re-zeroing this struct, we zero from sb_startzero to the end */
92#define sb_startzero sb_cc
93 u_long sb_cc; /* actual chars in buffer */
94 u_long sb_hiwat; /* max actual char count */
95 u_long sb_mbcnt; /* chars of mbufs used */
96 u_long sb_mbmax; /* max chars of mbufs to use */
97 u_long sb_lowat; /* low water mark */
98 struct mbuf *sb_mb; /* the mbuf chain */
99 struct mbuf *sb_mbtail; /* the last mbuf in the chain */
100 struct mbuf *sb_lastrecord; /* first mbuf of last record in
101 socket buffer */
102 int sb_flags; /* flags, see below */
103 int sb_timeo; /* timeout for read/write */
104 u_long sb_overflowed; /* # of drops due to full buffer */
105};
106
107#ifndef SB_MAX
108#define SB_MAX (256*1024) /* default for max chars in sockbuf */
109#endif
110
111#define SB_LOCK 0x01 /* lock on data queue */
112#define SB_NOTIFY 0x04 /* someone is waiting for data/space */
113#define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
114#define SB_UPCALL 0x20 /* someone wants an upcall */
115#define SB_NOINTR 0x40 /* operations not interruptible */
116#define SB_KNOTE 0x100 /* kernel note attached */
117#define SB_AUTOSIZE 0x800 /* automatically size socket buffer */
118
119/*
120 * Kernel structure per socket.
121 * Contains send and receive buffer queues,
122 * handle on protocol and pointer to protocol
123 * private data and error information.
124 */
125struct so_accf {
126 struct accept_filter *so_accept_filter;
127 void *so_accept_filter_arg; /* saved filter args */
128 char *so_accept_filter_str; /* saved user args */
129};
130
131struct sockaddr;
132
133struct socket {
134 kmutex_t * volatile so_lock; /* pointer to lock on structure */
135 kcondvar_t so_cv; /* notifier */
136 short so_type; /* generic type, see socket.h */
137 short so_options; /* from socket call, see socket.h */
138 u_short so_linger; /* time to linger while closing */
139 short so_state; /* internal state flags SS_*, below */
140 int so_unused; /* used to be so_nbio */
141 void *so_pcb; /* protocol control block */
142 const struct protosw *so_proto; /* protocol handle */
143/*
144 * Variables for connection queueing.
145 * Socket where accepts occur is so_head in all subsidiary sockets.
146 * If so_head is 0, socket is not related to an accept.
147 * For head socket so_q0 queues partially completed connections,
148 * while so_q is a queue of connections ready to be accepted.
149 * If a connection is aborted and it has so_head set, then
150 * it has to be pulled out of either so_q0 or so_q.
151 * We allow connections to queue up based on current queue lengths
152 * and limit on number of queued connections for this socket.
153 */
154 struct socket *so_head; /* back pointer to accept socket */
155 struct soqhead *so_onq; /* queue (q or q0) that we're on */
156 struct soqhead so_q0; /* queue of partial connections */
157 struct soqhead so_q; /* queue of incoming connections */
158 TAILQ_ENTRY(socket) so_qe; /* our queue entry (q or q0) */
159 short so_q0len; /* partials on so_q0 */
160 short so_qlen; /* number of connections on so_q */
161 short so_qlimit; /* max number queued connections */
162 short so_timeo; /* connection timeout */
163 u_short so_error; /* error affecting connection */
164 u_short so_rerror; /* error affecting receiving */
165 u_short so_aborting; /* references from soabort() */
166 pid_t so_pgid; /* pgid for signals */
167 u_long so_oobmark; /* chars to oob mark */
168 struct sockbuf so_snd; /* send buffer */
169 struct sockbuf so_rcv; /* receive buffer */
170
171 void *so_internal; /* Space for svr4 stream data */
172 void (*so_upcall) (struct socket *, void *, int, int);
173 void * so_upcallarg; /* Arg for above */
174 int (*so_send) (struct socket *, struct sockaddr *,
175 struct uio *, struct mbuf *,
176 struct mbuf *, int, struct lwp *);
177 int (*so_receive) (struct socket *,
178 struct mbuf **,
179 struct uio *, struct mbuf **,
180 struct mbuf **, int *);
181 struct mowner *so_mowner; /* who owns mbufs for this socket */
182 struct uidinfo *so_uidinfo; /* who opened the socket */
183 gid_t so_egid; /* creator effective gid */
184 pid_t so_cpid; /* creator pid */
185 struct so_accf *so_accf;
186 kauth_cred_t so_cred; /* socket credentials */
187};
188
189/*
190 * Socket state bits.
191 */
192#define SS_NOFDREF 0x001 /* no file table ref any more */
193#define SS_ISCONNECTED 0x002 /* socket connected to a peer */
194#define SS_ISCONNECTING 0x004 /* in process of connecting to peer */
195#define SS_ISDISCONNECTING 0x008 /* in process of disconnecting */
196#define SS_CANTSENDMORE 0x010 /* can't send more data to peer */
197#define SS_CANTRCVMORE 0x020 /* can't receive more data from peer */
198#define SS_RCVATMARK 0x040 /* at mark on input */
199#define SS_ISABORTING 0x080 /* aborting fd references - close() */
200#define SS_RESTARTSYS 0x100 /* restart blocked system calls */
201#define SS_POLLRDBAND 0x200 /* poll should return POLLRDBAND */
202#define SS_MORETOCOME 0x400 /*
203 * hint from sosend to lower layer;
204 * more data coming
205 */
206#define SS_ISDISCONNECTED 0x800 /* socket disconnected from peer */
207#define SS_ISAPIPE 0x1000 /* socket is implementing a pipe */
208#define SS_NBIO 0x2000 /* socket is in non blocking I/O */
209
210#ifdef _KERNEL
211
212struct accept_filter {
213 char accf_name[16];
214 void (*accf_callback)
215 (struct socket *, void *, int, int);
216 void * (*accf_create)
217 (struct socket *, char *);
218 void (*accf_destroy)
219 (struct socket *);
220 LIST_ENTRY(accept_filter) accf_next;
221 u_int accf_refcnt;
222};
223
224struct sockopt {
225 int sopt_level; /* option level */
226 int sopt_name; /* option name */
227 size_t sopt_size; /* data length */
228 size_t sopt_retsize; /* returned data length */
229 void * sopt_data; /* data pointer */
230 uint8_t sopt_buf[sizeof(int)]; /* internal storage */
231};
232
233#define SB_EMPTY_FIXUP(sb) \
234do { \
235 KASSERT(solocked((sb)->sb_so)); \
236 if ((sb)->sb_mb == NULL) { \
237 (sb)->sb_mbtail = NULL; \
238 (sb)->sb_lastrecord = NULL; \
239 } \
240} while (0)
241
242extern u_long sb_max;
243extern int somaxkva;
244extern int sock_loan_thresh;
245extern kmutex_t *softnet_lock;
246
247struct mbuf;
248struct lwp;
249struct msghdr;
250struct stat;
251struct knote;
252struct sockaddr_big;
253enum uio_seg;
254
255/* 0x400 is SO_OTIMESTAMP */
256#define SOOPT_TIMESTAMP(o) ((o) & (SO_TIMESTAMP | 0x400))
257
258/*
259 * File operations on sockets.
260 */
261int soo_read(file_t *, off_t *, struct uio *, kauth_cred_t, int);
262int soo_write(file_t *, off_t *, struct uio *, kauth_cred_t, int);
263int soo_fcntl(file_t *, u_int cmd, void *);
264int soo_ioctl(file_t *, u_long cmd, void *);
265int soo_poll(file_t *, int);
266int soo_kqfilter(file_t *, struct knote *);
267int soo_close(file_t *);
268int soo_stat(file_t *, struct stat *);
269void soo_restart(file_t *);
270void sbappend(struct sockbuf *, struct mbuf *);
271void sbappendstream(struct sockbuf *, struct mbuf *);
272int sbappendaddr(struct sockbuf *, const struct sockaddr *, struct mbuf *,
273 struct mbuf *);
274int sbappendaddrchain(struct sockbuf *, const struct sockaddr *,
275 struct mbuf *, int);
276int sbappendcontrol(struct sockbuf *, struct mbuf *, struct mbuf *);
277void sbappendrecord(struct sockbuf *, struct mbuf *);
278void sbcheck(struct sockbuf *);
279void sbcompress(struct sockbuf *, struct mbuf *, struct mbuf *);
280struct mbuf *
281 sbcreatecontrol(void *, int, int, int);
282struct mbuf *
283 sbcreatecontrol1(void **, int, int, int, int);
284struct mbuf **
285 sbsavetimestamp(int, struct mbuf **);
286void sbdrop(struct sockbuf *, int);
287void sbdroprecord(struct sockbuf *);
288void sbflush(struct sockbuf *);
289void sbinsertoob(struct sockbuf *, struct mbuf *);
290void sbrelease(struct sockbuf *, struct socket *);
291int sbreserve(struct sockbuf *, u_long, struct socket *);
292int sbwait(struct sockbuf *);
293int sb_max_set(u_long);
294void soinit(void);
295void soinit1(void);
296void soinit2(void);
297int soabort(struct socket *);
298int soaccept(struct socket *, struct sockaddr *);
299int sofamily(const struct socket *);
300int sobind(struct socket *, struct sockaddr *, struct lwp *);
301void socantrcvmore(struct socket *);
302void socantsendmore(struct socket *);
303void soroverflow(struct socket *);
304int soclose(struct socket *);
305int soconnect(struct socket *, struct sockaddr *, struct lwp *);
306int soconnect2(struct socket *, struct socket *);
307int socreate(int, struct socket **, int, int, struct lwp *,
308 struct socket *);
309int fsocreate(int, struct socket **, int, int, int *, file_t **,
310 struct socket *);
311int sodisconnect(struct socket *);
312void sofree(struct socket *);
313int sogetopt(struct socket *, struct sockopt *);
314void sohasoutofband(struct socket *);
315void soisconnected(struct socket *);
316void soisconnecting(struct socket *);
317void soisdisconnected(struct socket *);
318void soisdisconnecting(struct socket *);
319int solisten(struct socket *, int, struct lwp *);
320struct socket *
321 sonewconn(struct socket *, bool);
322void soqinsque(struct socket *, struct socket *, int);
323bool soqremque(struct socket *, int);
324int soreceive(struct socket *, struct mbuf **, struct uio *,
325 struct mbuf **, struct mbuf **, int *);
326int soreserve(struct socket *, u_long, u_long);
327void sorflush(struct socket *);
328int sosend(struct socket *, struct sockaddr *, struct uio *,
329 struct mbuf *, struct mbuf *, int, struct lwp *);
330int sosetopt(struct socket *, struct sockopt *);
331int so_setsockopt(struct lwp *, struct socket *, int, int, const void *, size_t);
332int soshutdown(struct socket *, int);
333void sorestart(struct socket *);
334void sowakeup(struct socket *, struct sockbuf *, int);
335int sockargs(struct mbuf **, const void *, size_t, enum uio_seg, int);
336int sopoll(struct socket *, int);
337struct socket *soget(bool);
338void soput(struct socket *);
339bool solocked(const struct socket *);
340bool solocked2(const struct socket *, const struct socket *);
341int sblock(struct sockbuf *, int);
342void sbunlock(struct sockbuf *);
343int sowait(struct socket *, bool, int);
344void solockretry(struct socket *, kmutex_t *);
345void sosetlock(struct socket *);
346void solockreset(struct socket *, kmutex_t *);
347
348void sockopt_init(struct sockopt *, int, int, size_t);
349void sockopt_destroy(struct sockopt *);
350int sockopt_set(struct sockopt *, const void *, size_t);
351int sockopt_setint(struct sockopt *, int);
352int sockopt_get(const struct sockopt *, void *, size_t);
353int sockopt_getint(const struct sockopt *, int *);
354int sockopt_setmbuf(struct sockopt *, struct mbuf *);
355struct mbuf *sockopt_getmbuf(const struct sockopt *);
356
357int copyout_sockname(struct sockaddr *, unsigned int *, int, struct mbuf *);
358int copyout_sockname_sb(struct sockaddr *, unsigned int *,
359 int , struct sockaddr_big *);
360int copyout_msg_control(struct lwp *, struct msghdr *, struct mbuf *);
361void free_control_mbuf(struct lwp *, struct mbuf *, struct mbuf *);
362
363int do_sys_getpeername(int, struct sockaddr *);
364int do_sys_getsockname(int, struct sockaddr *);
365
366int do_sys_sendmsg(struct lwp *, int, struct msghdr *, int, register_t *);
367int do_sys_sendmsg_so(struct lwp *, int, struct socket *, file_t *,
368 struct msghdr *, int, register_t *);
369
370int do_sys_recvmsg(struct lwp *, int, struct msghdr *,
371 struct mbuf **, struct mbuf **, register_t *);
372int do_sys_recvmsg_so(struct lwp *, int, struct socket *,
373 struct msghdr *mp, struct mbuf **, struct mbuf **, register_t *);
374
375int do_sys_bind(struct lwp *, int, struct sockaddr *);
376int do_sys_connect(struct lwp *, int, struct sockaddr *);
377int do_sys_accept(struct lwp *, int, struct sockaddr *, register_t *,
378 const sigset_t *, int, int);
379
380int do_sys_peeloff(struct socket *, void *);
381/*
382 * Inline functions for sockets and socket buffering.
383 */
384
385#include <sys/protosw.h>
386#include <sys/mbuf.h>
387
388/*
389 * Do we need to notify the other side when I/O is possible?
390 */
391static __inline int
392sb_notify(struct sockbuf *sb)
393{
394
395 KASSERT(solocked(sb->sb_so));
396
397 return sb->sb_flags & (SB_NOTIFY | SB_ASYNC | SB_UPCALL | SB_KNOTE);
398}
399
400/*
401 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
402 * Since the fields are unsigned, detect overflow and return 0.
403 */
404static __inline u_long
405sbspace(const struct sockbuf *sb)
406{
407
408 KASSERT(solocked(sb->sb_so));
409 if (sb->sb_hiwat <= sb->sb_cc || sb->sb_mbmax <= sb->sb_mbcnt)
410 return 0;
411 return lmin(sb->sb_hiwat - sb->sb_cc, sb->sb_mbmax - sb->sb_mbcnt);
412}
413
414static __inline u_long
415sbspace_oob(const struct sockbuf *sb)
416{
417 u_long hiwat = sb->sb_hiwat;
418
419 if (hiwat < ULONG_MAX - 1024)
420 hiwat += 1024;
421
422 KASSERT(solocked(sb->sb_so));
423
424 if (hiwat <= sb->sb_cc || sb->sb_mbmax <= sb->sb_mbcnt)
425 return 0;
426 return lmin(hiwat - sb->sb_cc, sb->sb_mbmax - sb->sb_mbcnt);
427}
428
429/*
430 * How much socket buffer space has been used?
431 */
432static __inline u_long
433sbused(const struct sockbuf *sb)
434{
435
436 KASSERT(solocked(sb->sb_so));
437 return sb->sb_cc;
438}
439
440/* do we have to send all at once on a socket? */
441static __inline int
442sosendallatonce(const struct socket *so)
443{
444
445 return so->so_proto->pr_flags & PR_ATOMIC;
446}
447
448/* can we read something from so? */
449static __inline int
450soreadable(const struct socket *so)
451{
452
453 KASSERT(solocked(so));
454
455 return so->so_rcv.sb_cc >= so->so_rcv.sb_lowat ||
456 (so->so_state & SS_CANTRCVMORE) != 0 ||
457 so->so_qlen != 0 || so->so_error != 0 || so->so_rerror != 0;
458}
459
460/* can we write something to so? */
461static __inline int
462sowritable(const struct socket *so)
463{
464
465 KASSERT(solocked(so));
466
467 return (sbspace(&so->so_snd) >= so->so_snd.sb_lowat &&
468 ((so->so_state & SS_ISCONNECTED) != 0 ||
469 (so->so_proto->pr_flags & PR_CONNREQUIRED) == 0)) ||
470 (so->so_state & SS_CANTSENDMORE) != 0 ||
471 so->so_error != 0;
472}
473
474/* adjust counters in sb reflecting allocation of m */
475static __inline void
476sballoc(struct sockbuf *sb, struct mbuf *m)
477{
478
479 KASSERT(solocked(sb->sb_so));
480
481 sb->sb_cc += m->m_len;
482 sb->sb_mbcnt += MSIZE;
483 if (m->m_flags & M_EXT)
484 sb->sb_mbcnt += m->m_ext.ext_size;
485}
486
487/* adjust counters in sb reflecting freeing of m */
488static __inline void
489sbfree(struct sockbuf *sb, struct mbuf *m)
490{
491
492 KASSERT(solocked(sb->sb_so));
493
494 sb->sb_cc -= m->m_len;
495 sb->sb_mbcnt -= MSIZE;
496 if (m->m_flags & M_EXT)
497 sb->sb_mbcnt -= m->m_ext.ext_size;
498}
499
500static __inline void
501sorwakeup(struct socket *so)
502{
503
504 KASSERT(solocked(so));
505
506 if (sb_notify(&so->so_rcv))
507 sowakeup(so, &so->so_rcv, POLL_IN);
508}
509
510static __inline void
511sowwakeup(struct socket *so)
512{
513
514 KASSERT(solocked(so));
515
516 if (sb_notify(&so->so_snd))
517 sowakeup(so, &so->so_snd, POLL_OUT);
518}
519
520static __inline void
521solock(struct socket *so)
522{
523 kmutex_t *lock;
524
525 lock = atomic_load_consume(&so->so_lock);
526 mutex_enter(lock);
527 if (__predict_false(lock != atomic_load_relaxed(&so->so_lock)))
528 solockretry(so, lock);
529}
530
531static __inline void
532sounlock(struct socket *so)
533{
534
535 mutex_exit(so->so_lock);
536}
537
538#ifdef SOCKBUF_DEBUG
539/*
540 * SBLASTRECORDCHK: check sb->sb_lastrecord is maintained correctly.
541 * SBLASTMBUFCHK: check sb->sb_mbtail is maintained correctly.
542 *
543 * => panic if the socket buffer is inconsistent.
544 * => 'where' is used for a panic message.
545 */
546void sblastrecordchk(struct sockbuf *, const char *);
547#define SBLASTRECORDCHK(sb, where) sblastrecordchk((sb), (where))
548
549void sblastmbufchk(struct sockbuf *, const char *);
550#define SBLASTMBUFCHK(sb, where) sblastmbufchk((sb), (where))
551#define SBCHECK(sb) sbcheck(sb)
552#else
553#define SBLASTRECORDCHK(sb, where) /* nothing */
554#define SBLASTMBUFCHK(sb, where) /* nothing */
555#define SBCHECK(sb) /* nothing */
556#endif /* SOCKBUF_DEBUG */
557
558/* sosend loan */
559vaddr_t sokvaalloc(vaddr_t, vsize_t, struct socket *);
560void sokvafree(vaddr_t, vsize_t);
561void soloanfree(struct mbuf *, void *, size_t, void *);
562
563/*
564 * Values for socket-buffer-append priority argument to sbappendaddrchain().
565 * The following flags are reserved for future implementation:
566 *
567 * SB_PRIO_NONE: honour normal socket-buffer limits.
568 *
569 * SB_PRIO_ONESHOT_OVERFLOW: if the socket has any space,
570 * deliver the entire chain. Intended for large requests
571 * that should be delivered in their entirety, or not at all.
572 *
573 * SB_PRIO_OVERDRAFT: allow a small (2*MLEN) overflow, over and
574 * above normal socket limits. Intended messages indicating
575 * buffer overflow in earlier normal/lower-priority messages .
576 *
577 * SB_PRIO_BESTEFFORT: Ignore limits entirely. Intended only for
578 * kernel-generated messages to specially-marked sockets which
579 * require "reliable" delivery, nd where the source socket/protocol
580 * message generator enforce some hard limit (but possibly well
581 * above kern.sbmax). It is entirely up to the in-kernel source to
582 * avoid complete mbuf exhaustion or DoS scenarios.
583 */
584#define SB_PRIO_NONE 0
585#define SB_PRIO_ONESHOT_OVERFLOW 1
586#define SB_PRIO_OVERDRAFT 2
587#define SB_PRIO_BESTEFFORT 3
588
589/*
590 * Accept filter functions (duh).
591 */
592int accept_filt_getopt(struct socket *, struct sockopt *);
593int accept_filt_setopt(struct socket *, const struct sockopt *);
594int accept_filt_clear(struct socket *);
595int accept_filt_add(struct accept_filter *);
596int accept_filt_del(struct accept_filter *);
597struct accept_filter *accept_filt_get(char *);
598#ifdef ACCEPT_FILTER_MOD
599#ifdef SYSCTL_DECL
600SYSCTL_DECL(_net_inet_accf);
601#endif
602void accept_filter_init(void);
603#endif
604#ifdef DDB
605int sofindproc(struct socket *so, int all, void (*pr)(const char *, ...));
606void socket_print(const char *modif, void (*pr)(const char *, ...));
607#endif
608
609#endif /* _KERNEL */
610
611#endif /* !_SYS_SOCKETVAR_H_ */