2 * Copyright (c) 2005 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 1982, 1986, 1988, 1990, 1993
4 * The Regents of the University of California. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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10 * notice, this list of conditions and the following disclaimer.
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12 * notice, this list of conditions and the following disclaimer in the
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14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
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23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)uipc_socket2.c 8.1 (Berkeley) 6/10/93
35 * $FreeBSD: src/sys/kern/uipc_socket2.c,v 1.55.2.17 2002/08/31 19:04:55 dwmalone Exp $
36 * $DragonFly: src/sys/kern/uipc_socket2.c,v 1.33 2008/09/02 16:17:52 dillon Exp $
39 #include "opt_param.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/domain.h>
43 #include <sys/file.h> /* for maxfiles */
44 #include <sys/kernel.h>
46 #include <sys/malloc.h>
48 #include <sys/protosw.h>
49 #include <sys/resourcevar.h>
51 #include <sys/socket.h>
52 #include <sys/socketvar.h>
53 #include <sys/socketops.h>
54 #include <sys/signalvar.h>
55 #include <sys/sysctl.h>
56 #include <sys/event.h>
58 #include <sys/thread2.h>
59 #include <sys/msgport2.h>
60 #include <sys/socketvar2.h>
65 * Primitive routines for operating on sockets and socket buffers
68 u_long sb_max = SB_MAX;
70 SB_MAX * MCLBYTES / (MSIZE + MCLBYTES); /* adjusted sb_max */
72 static u_long sb_efficiency = 8; /* parameter for sbreserve() */
74 /************************************************************************
75 * signalsockbuf procedures *
76 ************************************************************************/
79 * Wait for data to arrive at/drain from a socket buffer.
81 * NOTE: Caller must generally hold the ssb_lock (client side lock) since
82 * WAIT/WAKEUP only works for one client at a time.
84 * NOTE: Caller always retries whatever operation it was waiting on.
87 ssb_wait(struct signalsockbuf *ssb)
93 pflags = (ssb->ssb_flags & SSB_NOINTR) ? 0 : PCATCH;
96 flags = ssb->ssb_flags;
100 * WAKEUP and WAIT interlock eachother. We can catch the
101 * race by checking to see if WAKEUP has already been set,
102 * and only setting WAIT if WAKEUP is clear.
104 if (flags & SSB_WAKEUP) {
105 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
106 flags & ~SSB_WAKEUP)) {
114 * Only set WAIT if WAKEUP is clear.
116 tsleep_interlock(&ssb->ssb_cc, pflags);
117 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
119 error = tsleep(&ssb->ssb_cc, pflags | PINTERLOCKED,
120 "sbwait", ssb->ssb_timeo);
128 * Lock a sockbuf already known to be locked;
129 * return any error returned from sleep (EINTR).
132 _ssb_lock(struct signalsockbuf *ssb)
138 pflags = (ssb->ssb_flags & SSB_NOINTR) ? 0 : PCATCH;
141 flags = ssb->ssb_flags;
143 if (flags & SSB_LOCK) {
144 tsleep_interlock(&ssb->ssb_flags, pflags);
145 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
147 error = tsleep(&ssb->ssb_flags,
148 pflags | PINTERLOCKED,
154 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
156 lwkt_gettoken(&ssb->ssb_token);
166 * This does the same for sockbufs. Note that the xsockbuf structure,
167 * since it is always embedded in a socket, does not include a self
168 * pointer nor a length. We make this entry point public in case
169 * some other mechanism needs it.
172 ssbtoxsockbuf(struct signalsockbuf *ssb, struct xsockbuf *xsb)
174 xsb->sb_cc = ssb->ssb_cc;
175 xsb->sb_hiwat = ssb->ssb_hiwat;
176 xsb->sb_mbcnt = ssb->ssb_mbcnt;
177 xsb->sb_mbmax = ssb->ssb_mbmax;
178 xsb->sb_lowat = ssb->ssb_lowat;
179 xsb->sb_flags = ssb->ssb_flags;
180 xsb->sb_timeo = ssb->ssb_timeo;
184 /************************************************************************
185 * Procedures which manipulate socket state flags, wakeups, etc. *
186 ************************************************************************
188 * Normal sequence from the active (originating) side is that
189 * soisconnecting() is called during processing of connect() call, resulting
190 * in an eventual call to soisconnected() if/when the connection is
191 * established. When the connection is torn down soisdisconnecting() is
192 * called during processing of disconnect() call, and soisdisconnected() is
193 * called when the connection to the peer is totally severed.
195 * The semantics of these routines are such that connectionless protocols
196 * can call soisconnected() and soisdisconnected() only, bypassing the
197 * in-progress calls when setting up a ``connection'' takes no time.
199 * From the passive side, a socket is created with two queues of sockets:
200 * so_incomp for connections in progress and so_comp for connections
201 * already made and awaiting user acceptance. As a protocol is preparing
202 * incoming connections, it creates a socket structure queued on so_incomp
203 * by calling sonewconn(). When the connection is established,
204 * soisconnected() is called, and transfers the socket structure to so_comp,
205 * making it available to accept().
207 * If a socket is closed with sockets on either so_incomp or so_comp, these
208 * sockets are dropped.
210 * If higher level protocols are implemented in the kernel, the wakeups
211 * done here will sometimes cause software-interrupt process scheduling.
215 soisconnecting(struct socket *so)
217 soclrstate(so, SS_ISCONNECTED | SS_ISDISCONNECTING);
218 sosetstate(so, SS_ISCONNECTING);
222 soisconnected(struct socket *so)
226 while ((head = so->so_head) != NULL) {
227 lwkt_getpooltoken(head);
228 if (so->so_head == head)
230 lwkt_relpooltoken(head);
233 soclrstate(so, SS_ISCONNECTING | SS_ISDISCONNECTING | SS_ISCONFIRMING);
234 sosetstate(so, SS_ISCONNECTED);
235 if (head && (so->so_state & SS_INCOMP)) {
236 if ((so->so_options & SO_ACCEPTFILTER) != 0) {
237 so->so_upcall = head->so_accf->so_accept_filter->accf_callback;
238 so->so_upcallarg = head->so_accf->so_accept_filter_arg;
239 atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
240 so->so_options &= ~SO_ACCEPTFILTER;
241 so->so_upcall(so, so->so_upcallarg, 0);
242 lwkt_relpooltoken(head);
247 * Listen socket are not per-cpu.
249 TAILQ_REMOVE(&head->so_incomp, so, so_list);
251 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
253 sosetstate(so, SS_COMP);
254 soclrstate(so, SS_INCOMP);
257 * XXX head may be on a different protocol thread.
258 * sorwakeup()->sowakeup() is hacked atm.
261 wakeup_one(&head->so_timeo);
263 wakeup(&so->so_timeo);
268 lwkt_relpooltoken(head);
272 soisdisconnecting(struct socket *so)
274 soclrstate(so, SS_ISCONNECTING);
275 sosetstate(so, SS_ISDISCONNECTING | SS_CANTRCVMORE | SS_CANTSENDMORE);
276 wakeup((caddr_t)&so->so_timeo);
282 soisdisconnected(struct socket *so)
284 soclrstate(so, SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING);
285 sosetstate(so, SS_CANTRCVMORE | SS_CANTSENDMORE | SS_ISDISCONNECTED);
286 wakeup((caddr_t)&so->so_timeo);
287 sbdrop(&so->so_snd.sb, so->so_snd.ssb_cc);
293 soisreconnecting(struct socket *so)
295 soclrstate(so, SS_ISDISCONNECTING | SS_ISDISCONNECTED |
296 SS_CANTRCVMORE | SS_CANTSENDMORE);
297 sosetstate(so, SS_ISCONNECTING);
301 soisreconnected(struct socket *so)
303 soclrstate(so, SS_ISDISCONNECTED | SS_CANTRCVMORE | SS_CANTSENDMORE);
308 * Set or change the message port a socket receives commands on.
313 sosetport(struct socket *so, lwkt_port_t port)
319 * When an attempt at a new connection is noted on a socket
320 * which accepts connections, sonewconn is called. If the
321 * connection is possible (subject to space constraints, etc.)
322 * then we allocate a new structure, propoerly linked into the
323 * data structure of the original socket, and return this.
324 * Connstatus may be 0, or SO_ISCONFIRMING, or SO_ISCONNECTED.
326 * The new socket is returned with one ref and so_pcb assigned.
327 * The reference is implied by so_pcb.
330 sonewconn(struct socket *head, int connstatus)
334 struct pru_attach_info ai;
336 if (head->so_qlen > 3 * head->so_qlimit / 2)
343 * Set the port prior to attaching the inpcb to the current
344 * cpu's protocol thread (which should be the current thread
345 * but might not be in all cases). This serializes any pcb ops
346 * which occur to our cpu allowing us to complete the attachment
347 * without racing anything.
349 sosetport(so, cpu_portfn(mycpu->gd_cpuid));
350 if ((head->so_options & SO_ACCEPTFILTER) != 0)
353 so->so_type = head->so_type;
354 so->so_options = head->so_options &~ SO_ACCEPTCONN;
355 so->so_linger = head->so_linger;
358 * NOTE: Clearing NOFDREF implies referencing the so with
361 so->so_state = head->so_state | SS_NOFDREF | SS_ASSERTINPROG;
362 so->so_proto = head->so_proto;
363 so->so_cred = crhold(head->so_cred);
366 ai.fd_rdir = NULL; /* jail code cruft XXX JH */
369 * Reserve space and call pru_attach. We can direct-call the
370 * function since we're already in the protocol thread.
372 if (soreserve(so, head->so_snd.ssb_hiwat,
373 head->so_rcv.ssb_hiwat, NULL) ||
374 so_pru_attach_direct(so, 0, &ai)) {
376 soclrstate(so, SS_ASSERTINPROG);
377 sofree(so); /* remove implied pcb ref */
380 KKASSERT(so->so_refs == 2); /* attach + our base ref */
382 KKASSERT(so->so_port != NULL);
383 so->so_rcv.ssb_lowat = head->so_rcv.ssb_lowat;
384 so->so_snd.ssb_lowat = head->so_snd.ssb_lowat;
385 so->so_rcv.ssb_timeo = head->so_rcv.ssb_timeo;
386 so->so_snd.ssb_timeo = head->so_snd.ssb_timeo;
388 if (head->so_rcv.ssb_flags & SSB_AUTOLOWAT)
389 so->so_rcv.ssb_flags |= SSB_AUTOLOWAT;
391 so->so_rcv.ssb_flags &= ~SSB_AUTOLOWAT;
393 if (head->so_snd.ssb_flags & SSB_AUTOLOWAT)
394 so->so_snd.ssb_flags |= SSB_AUTOLOWAT;
396 so->so_snd.ssb_flags &= ~SSB_AUTOLOWAT;
398 if (head->so_rcv.ssb_flags & SSB_AUTOSIZE)
399 so->so_rcv.ssb_flags |= SSB_AUTOSIZE;
401 so->so_rcv.ssb_flags &= ~SSB_AUTOSIZE;
403 if (head->so_snd.ssb_flags & SSB_AUTOSIZE)
404 so->so_snd.ssb_flags |= SSB_AUTOSIZE;
406 so->so_snd.ssb_flags &= ~SSB_AUTOSIZE;
408 lwkt_getpooltoken(head);
410 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
411 sosetstate(so, SS_COMP);
414 if (head->so_incqlen > head->so_qlimit) {
415 sp = TAILQ_FIRST(&head->so_incomp);
416 TAILQ_REMOVE(&head->so_incomp, sp, so_list);
418 soclrstate(sp, SS_INCOMP);
422 TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
423 sosetstate(so, SS_INCOMP);
426 lwkt_relpooltoken(head);
429 * XXX head may be on a different protocol thread.
430 * sorwakeup()->sowakeup() is hacked atm.
433 wakeup((caddr_t)&head->so_timeo);
434 sosetstate(so, connstatus);
436 soclrstate(so, SS_ASSERTINPROG);
441 * Socantsendmore indicates that no more data will be sent on the
442 * socket; it would normally be applied to a socket when the user
443 * informs the system that no more data is to be sent, by the protocol
444 * code (in case PRU_SHUTDOWN). Socantrcvmore indicates that no more data
445 * will be received, and will normally be applied to the socket by a
446 * protocol when it detects that the peer will send no more data.
447 * Data queued for reading in the socket may yet be read.
450 socantsendmore(struct socket *so)
452 sosetstate(so, SS_CANTSENDMORE);
457 socantrcvmore(struct socket *so)
459 sosetstate(so, SS_CANTRCVMORE);
464 * Wakeup processes waiting on a socket buffer. Do asynchronous notification
465 * via SIGIO if the socket has the SS_ASYNC flag set.
467 * For users waiting on send/recv try to avoid unnecessary context switch
468 * thrashing. Particularly for senders of large buffers (needs to be
469 * extended to sel and aio? XXX)
471 * WARNING! Can be called on a foreign socket from the wrong protocol
472 * thread. aka is called on the 'head' listen socket when
473 * a new connection comes in.
476 sowakeup(struct socket *so, struct signalsockbuf *ssb)
478 struct kqinfo *kqinfo = &ssb->ssb_kq;
482 * Check conditions, set the WAKEUP flag, and clear and signal if
483 * the WAIT flag is found to be set. This interlocks against the
487 flags = ssb->ssb_flags;
490 if ((ssb == &so->so_snd && ssb_space(ssb) >= ssb->ssb_lowat) ||
491 (ssb == &so->so_rcv && ssb->ssb_cc >= ssb->ssb_lowat) ||
492 (ssb == &so->so_snd && (so->so_state & SS_CANTSENDMORE)) ||
493 (ssb == &so->so_rcv && (so->so_state & SS_CANTRCVMORE))
495 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
496 (flags | SSB_WAKEUP) & ~SSB_WAIT)) {
497 if (flags & SSB_WAIT)
498 wakeup(&ssb->ssb_cc);
509 if ((so->so_state & SS_ASYNC) && so->so_sigio != NULL)
510 pgsigio(so->so_sigio, SIGIO, 0);
511 if (ssb->ssb_flags & SSB_UPCALL)
512 (*so->so_upcall)(so, so->so_upcallarg, MB_DONTWAIT);
513 KNOTE(&kqinfo->ki_note, 0);
516 * This is a bit of a hack. Multiple threads can wind up scanning
517 * ki_mlist concurrently due to the fact that this function can be
518 * called on a foreign socket, so we can't afford to block here.
520 * We need the pool token for (so) (likely the listne socket if
521 * SSB_MEVENT is set) because the predicate function may have
522 * to access the accept queue.
524 if (ssb->ssb_flags & SSB_MEVENT) {
525 struct netmsg_so_notify *msg, *nmsg;
527 lwkt_getpooltoken(so);
528 TAILQ_FOREACH_MUTABLE(msg, &kqinfo->ki_mlist, nm_list, nmsg) {
529 if (msg->nm_predicate(msg)) {
530 TAILQ_REMOVE(&kqinfo->ki_mlist, msg, nm_list);
531 lwkt_replymsg(&msg->base.lmsg,
532 msg->base.lmsg.ms_error);
535 if (TAILQ_EMPTY(&ssb->ssb_kq.ki_mlist))
536 atomic_clear_int(&ssb->ssb_flags, SSB_MEVENT);
537 lwkt_relpooltoken(so);
542 * Socket buffer (struct signalsockbuf) utility routines.
544 * Each socket contains two socket buffers: one for sending data and
545 * one for receiving data. Each buffer contains a queue of mbufs,
546 * information about the number of mbufs and amount of data in the
547 * queue, and other fields allowing kevent()/select()/poll() statements
548 * and notification on data availability to be implemented.
550 * Data stored in a socket buffer is maintained as a list of records.
551 * Each record is a list of mbufs chained together with the m_next
552 * field. Records are chained together with the m_nextpkt field. The upper
553 * level routine soreceive() expects the following conventions to be
554 * observed when placing information in the receive buffer:
556 * 1. If the protocol requires each message be preceded by the sender's
557 * name, then a record containing that name must be present before
558 * any associated data (mbuf's must be of type MT_SONAME).
559 * 2. If the protocol supports the exchange of ``access rights'' (really
560 * just additional data associated with the message), and there are
561 * ``rights'' to be received, then a record containing this data
562 * should be present (mbuf's must be of type MT_RIGHTS).
563 * 3. If a name or rights record exists, then it must be followed by
564 * a data record, perhaps of zero length.
566 * Before using a new socket structure it is first necessary to reserve
567 * buffer space to the socket, by calling sbreserve(). This should commit
568 * some of the available buffer space in the system buffer pool for the
569 * socket (currently, it does nothing but enforce limits). The space
570 * should be released by calling ssb_release() when the socket is destroyed.
573 soreserve(struct socket *so, u_long sndcc, u_long rcvcc, struct rlimit *rl)
575 if (so->so_snd.ssb_lowat == 0)
576 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOLOWAT);
577 if (ssb_reserve(&so->so_snd, sndcc, so, rl) == 0)
579 if (ssb_reserve(&so->so_rcv, rcvcc, so, rl) == 0)
581 if (so->so_rcv.ssb_lowat == 0)
582 so->so_rcv.ssb_lowat = 1;
583 if (so->so_snd.ssb_lowat == 0)
584 so->so_snd.ssb_lowat = MCLBYTES;
585 if (so->so_snd.ssb_lowat > so->so_snd.ssb_hiwat)
586 so->so_snd.ssb_lowat = so->so_snd.ssb_hiwat;
589 ssb_release(&so->so_snd, so);
595 sysctl_handle_sb_max(SYSCTL_HANDLER_ARGS)
598 u_long old_sb_max = sb_max;
600 error = SYSCTL_OUT(req, arg1, sizeof(int));
601 if (error || !req->newptr)
603 error = SYSCTL_IN(req, arg1, sizeof(int));
606 if (sb_max < MSIZE + MCLBYTES) {
610 sb_max_adj = (u_quad_t)sb_max * MCLBYTES / (MSIZE + MCLBYTES);
615 * Allot mbufs to a signalsockbuf.
617 * Attempt to scale mbmax so that mbcnt doesn't become limiting
618 * if buffering efficiency is near the normal case.
620 * sb_max only applies to user-sockets (where rl != NULL). It does
621 * not apply to kernel sockets or kernel-controlled sockets. Note
622 * that NFS overrides the sockbuf limits created when nfsd creates
626 ssb_reserve(struct signalsockbuf *ssb, u_long cc, struct socket *so,
630 * rl will only be NULL when we're in an interrupt (eg, in tcp_input)
631 * or when called from netgraph (ie, ngd_attach)
633 if (rl && cc > sb_max_adj)
635 if (!chgsbsize(so->so_cred->cr_uidinfo, &ssb->ssb_hiwat, cc,
636 rl ? rl->rlim_cur : RLIM_INFINITY)) {
640 ssb->ssb_mbmax = min(cc * sb_efficiency, sb_max);
642 ssb->ssb_mbmax = cc * sb_efficiency;
645 * AUTOLOWAT is set on send buffers and prevents large writes
646 * from generating a huge number of context switches.
648 if (ssb->ssb_flags & SSB_AUTOLOWAT) {
649 ssb->ssb_lowat = ssb->ssb_hiwat / 2;
650 if (ssb->ssb_lowat < MCLBYTES)
651 ssb->ssb_lowat = MCLBYTES;
653 if (ssb->ssb_lowat > ssb->ssb_hiwat)
654 ssb->ssb_lowat = ssb->ssb_hiwat;
659 * Free mbufs held by a socket, and reserved mbuf space.
662 ssb_release(struct signalsockbuf *ssb, struct socket *so)
665 (void)chgsbsize(so->so_cred->cr_uidinfo, &ssb->ssb_hiwat, 0,
671 * Some routines that return EOPNOTSUPP for entry points that are not
672 * supported by a protocol. Fill in as needed.
675 pr_generic_notsupp(netmsg_t msg)
677 lwkt_replymsg(&msg->lmsg, EOPNOTSUPP);
681 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
682 struct mbuf *top, struct mbuf *control, int flags,
693 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
694 struct uio *uio, struct sockbuf *sio,
695 struct mbuf **controlp, int *flagsp)
701 * This isn't really a ``null'' operation, but it's the default one
702 * and doesn't do anything destructive.
705 pru_sense_null(netmsg_t msg)
707 msg->sense.nm_stat->st_blksize = msg->base.nm_so->so_snd.ssb_hiwat;
708 lwkt_replymsg(&msg->lmsg, 0);
712 * Make a copy of a sockaddr in a malloced buffer of type M_SONAME. Callers
713 * of this routine assume that it always succeeds, so we have to use a
714 * blockable allocation even though we might be called from a critical thread.
717 dup_sockaddr(const struct sockaddr *sa)
719 struct sockaddr *sa2;
721 sa2 = kmalloc(sa->sa_len, M_SONAME, M_INTWAIT);
722 bcopy(sa, sa2, sa->sa_len);
727 * Create an external-format (``xsocket'') structure using the information
728 * in the kernel-format socket structure pointed to by so. This is done
729 * to reduce the spew of irrelevant information over this interface,
730 * to isolate user code from changes in the kernel structure, and
731 * potentially to provide information-hiding if we decide that
732 * some of this information should be hidden from users.
735 sotoxsocket(struct socket *so, struct xsocket *xso)
737 xso->xso_len = sizeof *xso;
739 xso->so_type = so->so_type;
740 xso->so_options = so->so_options;
741 xso->so_linger = so->so_linger;
742 xso->so_state = so->so_state;
743 xso->so_pcb = so->so_pcb;
744 xso->xso_protocol = so->so_proto->pr_protocol;
745 xso->xso_family = so->so_proto->pr_domain->dom_family;
746 xso->so_qlen = so->so_qlen;
747 xso->so_incqlen = so->so_incqlen;
748 xso->so_qlimit = so->so_qlimit;
749 xso->so_timeo = so->so_timeo;
750 xso->so_error = so->so_error;
751 xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
752 xso->so_oobmark = so->so_oobmark;
753 ssbtoxsockbuf(&so->so_snd, &xso->so_snd);
754 ssbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
755 xso->so_uid = so->so_cred->cr_uid;
759 * Here is the definition of some of the basic objects in the kern.ipc
762 SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW, 0, "IPC");
765 * This takes the place of kern.maxsockbuf, which moved to kern.ipc.
767 * NOTE! sb_max only applies to user-created socket buffers.
770 SYSCTL_INT(_kern, KERN_DUMMY, dummy, CTLFLAG_RW, &dummy, 0, "");
771 SYSCTL_OID(_kern_ipc, KIPC_MAXSOCKBUF, maxsockbuf, CTLTYPE_INT|CTLFLAG_RW,
772 &sb_max, 0, sysctl_handle_sb_max, "I", "Maximum socket buffer size");
773 SYSCTL_INT(_kern_ipc, OID_AUTO, maxsockets, CTLFLAG_RD,
774 &maxsockets, 0, "Maximum number of sockets available");
775 SYSCTL_INT(_kern_ipc, KIPC_SOCKBUF_WASTE, sockbuf_waste_factor, CTLFLAG_RW,
777 "Socket buffer limit scaler");
780 * Initialize maxsockets
783 init_maxsockets(void *ignored)
785 TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
786 maxsockets = imax(maxsockets, imax(maxfiles, nmbclusters));
788 SYSINIT(param, SI_BOOT1_TUNABLES, SI_ORDER_ANY,
789 init_maxsockets, NULL);