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
9 * 1. Redistributions of source code must retain the above copyright
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
13 * documentation and/or other materials provided with the distribution.
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.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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>
62 #include <net/netisr2.h>
67 * Primitive routines for operating on sockets and socket buffers
70 u_long sb_max = SB_MAX;
72 SB_MAX * MCLBYTES / (MSIZE + MCLBYTES); /* adjusted sb_max */
74 static u_long sb_efficiency = 8; /* parameter for sbreserve() */
76 /************************************************************************
77 * signalsockbuf procedures *
78 ************************************************************************/
81 * Wait for data to arrive at/drain from a socket buffer.
83 * NOTE: Caller must generally hold the ssb_lock (client side lock) since
84 * WAIT/WAKEUP only works for one client at a time.
86 * NOTE: Caller always retries whatever operation it was waiting on.
89 ssb_wait(struct signalsockbuf *ssb)
95 pflags = (ssb->ssb_flags & SSB_NOINTR) ? 0 : PCATCH;
98 flags = ssb->ssb_flags;
102 * WAKEUP and WAIT interlock eachother. We can catch the
103 * race by checking to see if WAKEUP has already been set,
104 * and only setting WAIT if WAKEUP is clear.
106 if (flags & SSB_WAKEUP) {
107 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
108 flags & ~SSB_WAKEUP)) {
116 * Only set WAIT if WAKEUP is clear.
118 tsleep_interlock(&ssb->ssb_cc, pflags);
119 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
121 error = tsleep(&ssb->ssb_cc, pflags | PINTERLOCKED,
122 "sbwait", ssb->ssb_timeo);
130 * Lock a sockbuf already known to be locked;
131 * return any error returned from sleep (EINTR).
134 _ssb_lock(struct signalsockbuf *ssb)
140 pflags = (ssb->ssb_flags & SSB_NOINTR) ? 0 : PCATCH;
143 flags = ssb->ssb_flags;
145 if (flags & SSB_LOCK) {
146 tsleep_interlock(&ssb->ssb_flags, pflags);
147 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
149 error = tsleep(&ssb->ssb_flags,
150 pflags | PINTERLOCKED,
156 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
158 lwkt_gettoken(&ssb->ssb_token);
168 * This does the same for sockbufs. Note that the xsockbuf structure,
169 * since it is always embedded in a socket, does not include a self
170 * pointer nor a length. We make this entry point public in case
171 * some other mechanism needs it.
174 ssbtoxsockbuf(struct signalsockbuf *ssb, struct xsockbuf *xsb)
176 xsb->sb_cc = ssb->ssb_cc;
177 xsb->sb_hiwat = ssb->ssb_hiwat;
178 xsb->sb_mbcnt = ssb->ssb_mbcnt;
179 xsb->sb_mbmax = ssb->ssb_mbmax;
180 xsb->sb_lowat = ssb->ssb_lowat;
181 xsb->sb_flags = ssb->ssb_flags;
182 xsb->sb_timeo = ssb->ssb_timeo;
186 /************************************************************************
187 * Procedures which manipulate socket state flags, wakeups, etc. *
188 ************************************************************************
190 * Normal sequence from the active (originating) side is that
191 * soisconnecting() is called during processing of connect() call, resulting
192 * in an eventual call to soisconnected() if/when the connection is
193 * established. When the connection is torn down soisdisconnecting() is
194 * called during processing of disconnect() call, and soisdisconnected() is
195 * called when the connection to the peer is totally severed.
197 * The semantics of these routines are such that connectionless protocols
198 * can call soisconnected() and soisdisconnected() only, bypassing the
199 * in-progress calls when setting up a ``connection'' takes no time.
201 * From the passive side, a socket is created with two queues of sockets:
202 * so_incomp for connections in progress and so_comp for connections
203 * already made and awaiting user acceptance. As a protocol is preparing
204 * incoming connections, it creates a socket structure queued on so_incomp
205 * by calling sonewconn(). When the connection is established,
206 * soisconnected() is called, and transfers the socket structure to so_comp,
207 * making it available to accept().
209 * If a socket is closed with sockets on either so_incomp or so_comp, these
210 * sockets are dropped.
212 * If higher level protocols are implemented in the kernel, the wakeups
213 * done here will sometimes cause software-interrupt process scheduling.
217 soisconnecting(struct socket *so)
219 soclrstate(so, SS_ISCONNECTED | SS_ISDISCONNECTING);
220 sosetstate(so, SS_ISCONNECTING);
224 soisconnected(struct socket *so)
228 while ((head = so->so_head) != NULL) {
229 lwkt_getpooltoken(head);
230 if (so->so_head == head)
232 lwkt_relpooltoken(head);
235 soclrstate(so, SS_ISCONNECTING | SS_ISDISCONNECTING | SS_ISCONFIRMING);
236 sosetstate(so, SS_ISCONNECTED);
237 if (head && (so->so_state & SS_INCOMP)) {
238 if ((so->so_options & SO_ACCEPTFILTER) != 0) {
239 so->so_upcall = head->so_accf->so_accept_filter->accf_callback;
240 so->so_upcallarg = head->so_accf->so_accept_filter_arg;
241 atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
242 so->so_options &= ~SO_ACCEPTFILTER;
243 so->so_upcall(so, so->so_upcallarg, 0);
244 lwkt_relpooltoken(head);
249 * Listen socket are not per-cpu.
251 TAILQ_REMOVE(&head->so_incomp, so, so_list);
253 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
255 sosetstate(so, SS_COMP);
256 soclrstate(so, SS_INCOMP);
259 * XXX head may be on a different protocol thread.
260 * sorwakeup()->sowakeup() is hacked atm.
263 wakeup_one(&head->so_timeo);
265 wakeup(&so->so_timeo);
270 lwkt_relpooltoken(head);
274 soisdisconnecting(struct socket *so)
276 soclrstate(so, SS_ISCONNECTING);
277 sosetstate(so, SS_ISDISCONNECTING | SS_CANTRCVMORE | SS_CANTSENDMORE);
278 wakeup((caddr_t)&so->so_timeo);
284 soisdisconnected(struct socket *so)
286 soclrstate(so, SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING);
287 sosetstate(so, SS_CANTRCVMORE | SS_CANTSENDMORE | SS_ISDISCONNECTED);
288 wakeup((caddr_t)&so->so_timeo);
289 sbdrop(&so->so_snd.sb, so->so_snd.ssb_cc);
295 soisreconnecting(struct socket *so)
297 soclrstate(so, SS_ISDISCONNECTING | SS_ISDISCONNECTED |
298 SS_CANTRCVMORE | SS_CANTSENDMORE);
299 sosetstate(so, SS_ISCONNECTING);
303 soisreconnected(struct socket *so)
305 soclrstate(so, SS_ISDISCONNECTED | SS_CANTRCVMORE | SS_CANTSENDMORE);
310 * Set or change the message port a socket receives commands on.
315 sosetport(struct socket *so, lwkt_port_t port)
321 * When an attempt at a new connection is noted on a socket
322 * which accepts connections, sonewconn is called. If the
323 * connection is possible (subject to space constraints, etc.)
324 * then we allocate a new structure, propoerly linked into the
325 * data structure of the original socket, and return this.
326 * Connstatus may be 0, or SO_ISCONFIRMING, or SO_ISCONNECTED.
328 * The new socket is returned with one ref and so_pcb assigned.
329 * The reference is implied by so_pcb.
332 sonewconn_faddr(struct socket *head, int connstatus,
333 const struct sockaddr *faddr)
337 struct pru_attach_info ai;
339 if (head->so_qlen > 3 * head->so_qlimit / 2)
341 so = soalloc(1, head->so_proto);
346 * Set the port prior to attaching the inpcb to the current
347 * cpu's protocol thread (which should be the current thread
348 * but might not be in all cases). This serializes any pcb ops
349 * which occur to our cpu allowing us to complete the attachment
350 * without racing anything.
352 if (head->so_proto->pr_flags & PR_SYNC_PORT)
353 sosetport(so, &netisr_sync_port);
355 sosetport(so, netisr_cpuport(mycpuid));
356 if ((head->so_options & SO_ACCEPTFILTER) != 0)
359 so->so_type = head->so_type;
360 so->so_options = head->so_options &~ SO_ACCEPTCONN;
361 so->so_linger = head->so_linger;
364 * NOTE: Clearing NOFDREF implies referencing the so with
367 so->so_state = head->so_state | SS_NOFDREF | SS_ASSERTINPROG;
368 so->so_cred = crhold(head->so_cred);
371 ai.fd_rdir = NULL; /* jail code cruft XXX JH */
374 * Reserve space and call pru_attach. We can direct-call the
375 * function since we're already in the protocol thread.
377 if (soreserve(so, head->so_snd.ssb_hiwat,
378 head->so_rcv.ssb_hiwat, NULL) ||
379 so_pru_attach_direct(so, 0, &ai)) {
381 soclrstate(so, SS_ASSERTINPROG);
382 sofree(so); /* remove implied pcb ref */
385 KKASSERT(((so->so_proto->pr_flags & PR_ASYNC_RCVD) == 0 &&
386 so->so_refs == 2) || /* attach + our base ref */
387 ((so->so_proto->pr_flags & PR_ASYNC_RCVD) &&
388 so->so_refs == 3)); /* + async rcvd ref */
390 KKASSERT(so->so_port != NULL);
391 so->so_rcv.ssb_lowat = head->so_rcv.ssb_lowat;
392 so->so_snd.ssb_lowat = head->so_snd.ssb_lowat;
393 so->so_rcv.ssb_timeo = head->so_rcv.ssb_timeo;
394 so->so_snd.ssb_timeo = head->so_snd.ssb_timeo;
396 if (head->so_rcv.ssb_flags & SSB_AUTOLOWAT)
397 so->so_rcv.ssb_flags |= SSB_AUTOLOWAT;
399 so->so_rcv.ssb_flags &= ~SSB_AUTOLOWAT;
401 if (head->so_snd.ssb_flags & SSB_AUTOLOWAT)
402 so->so_snd.ssb_flags |= SSB_AUTOLOWAT;
404 so->so_snd.ssb_flags &= ~SSB_AUTOLOWAT;
406 if (head->so_rcv.ssb_flags & SSB_AUTOSIZE)
407 so->so_rcv.ssb_flags |= SSB_AUTOSIZE;
409 so->so_rcv.ssb_flags &= ~SSB_AUTOSIZE;
411 if (head->so_snd.ssb_flags & SSB_AUTOSIZE)
412 so->so_snd.ssb_flags |= SSB_AUTOSIZE;
414 so->so_snd.ssb_flags &= ~SSB_AUTOSIZE;
417 * Save the faddr, if the information is provided and
418 * the protocol can perform the saving opertation.
420 if (faddr != NULL && so->so_proto->pr_usrreqs->pru_savefaddr != NULL)
421 so->so_proto->pr_usrreqs->pru_savefaddr(so, faddr);
423 lwkt_getpooltoken(head);
425 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
426 sosetstate(so, SS_COMP);
429 if (head->so_incqlen > head->so_qlimit) {
430 sp = TAILQ_FIRST(&head->so_incomp);
431 TAILQ_REMOVE(&head->so_incomp, sp, so_list);
433 soclrstate(sp, SS_INCOMP);
437 TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
438 sosetstate(so, SS_INCOMP);
441 lwkt_relpooltoken(head);
444 * XXX head may be on a different protocol thread.
445 * sorwakeup()->sowakeup() is hacked atm.
448 wakeup((caddr_t)&head->so_timeo);
449 sosetstate(so, connstatus);
451 soclrstate(so, SS_ASSERTINPROG);
456 sonewconn(struct socket *head, int connstatus)
458 return sonewconn_faddr(head, connstatus, NULL);
462 * Socantsendmore indicates that no more data will be sent on the
463 * socket; it would normally be applied to a socket when the user
464 * informs the system that no more data is to be sent, by the protocol
465 * code (in case PRU_SHUTDOWN). Socantrcvmore indicates that no more data
466 * will be received, and will normally be applied to the socket by a
467 * protocol when it detects that the peer will send no more data.
468 * Data queued for reading in the socket may yet be read.
471 socantsendmore(struct socket *so)
473 sosetstate(so, SS_CANTSENDMORE);
478 socantrcvmore(struct socket *so)
480 sosetstate(so, SS_CANTRCVMORE);
485 * Wakeup processes waiting on a socket buffer. Do asynchronous notification
486 * via SIGIO if the socket has the SS_ASYNC flag set.
488 * For users waiting on send/recv try to avoid unnecessary context switch
489 * thrashing. Particularly for senders of large buffers (needs to be
490 * extended to sel and aio? XXX)
492 * WARNING! Can be called on a foreign socket from the wrong protocol
493 * thread. aka is called on the 'head' listen socket when
494 * a new connection comes in.
497 sowakeup(struct socket *so, struct signalsockbuf *ssb)
499 struct kqinfo *kqinfo = &ssb->ssb_kq;
503 * Check conditions, set the WAKEUP flag, and clear and signal if
504 * the WAIT flag is found to be set. This interlocks against the
508 flags = ssb->ssb_flags;
511 if ((ssb == &so->so_snd && ssb_space(ssb) >= ssb->ssb_lowat) ||
512 (ssb == &so->so_rcv && ssb->ssb_cc >= ssb->ssb_lowat) ||
513 (ssb == &so->so_snd && (so->so_state & SS_CANTSENDMORE)) ||
514 (ssb == &so->so_rcv && (so->so_state & SS_CANTRCVMORE))
516 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
517 (flags | SSB_WAKEUP) & ~SSB_WAIT)) {
518 if (flags & SSB_WAIT)
519 wakeup(&ssb->ssb_cc);
530 if ((so->so_state & SS_ASYNC) && so->so_sigio != NULL)
531 pgsigio(so->so_sigio, SIGIO, 0);
532 if (ssb->ssb_flags & SSB_UPCALL)
533 (*so->so_upcall)(so, so->so_upcallarg, MB_DONTWAIT);
534 KNOTE(&kqinfo->ki_note, 0);
537 * This is a bit of a hack. Multiple threads can wind up scanning
538 * ki_mlist concurrently due to the fact that this function can be
539 * called on a foreign socket, so we can't afford to block here.
541 * We need the pool token for (so) (likely the listne socket if
542 * SSB_MEVENT is set) because the predicate function may have
543 * to access the accept queue.
545 if (ssb->ssb_flags & SSB_MEVENT) {
546 struct netmsg_so_notify *msg, *nmsg;
548 lwkt_getpooltoken(so);
549 TAILQ_FOREACH_MUTABLE(msg, &kqinfo->ki_mlist, nm_list, nmsg) {
550 if (msg->nm_predicate(msg)) {
551 TAILQ_REMOVE(&kqinfo->ki_mlist, msg, nm_list);
552 lwkt_replymsg(&msg->base.lmsg,
553 msg->base.lmsg.ms_error);
556 if (TAILQ_EMPTY(&ssb->ssb_kq.ki_mlist))
557 atomic_clear_int(&ssb->ssb_flags, SSB_MEVENT);
558 lwkt_relpooltoken(so);
563 * Socket buffer (struct signalsockbuf) utility routines.
565 * Each socket contains two socket buffers: one for sending data and
566 * one for receiving data. Each buffer contains a queue of mbufs,
567 * information about the number of mbufs and amount of data in the
568 * queue, and other fields allowing kevent()/select()/poll() statements
569 * and notification on data availability to be implemented.
571 * Data stored in a socket buffer is maintained as a list of records.
572 * Each record is a list of mbufs chained together with the m_next
573 * field. Records are chained together with the m_nextpkt field. The upper
574 * level routine soreceive() expects the following conventions to be
575 * observed when placing information in the receive buffer:
577 * 1. If the protocol requires each message be preceded by the sender's
578 * name, then a record containing that name must be present before
579 * any associated data (mbuf's must be of type MT_SONAME).
580 * 2. If the protocol supports the exchange of ``access rights'' (really
581 * just additional data associated with the message), and there are
582 * ``rights'' to be received, then a record containing this data
583 * should be present (mbuf's must be of type MT_RIGHTS).
584 * 3. If a name or rights record exists, then it must be followed by
585 * a data record, perhaps of zero length.
587 * Before using a new socket structure it is first necessary to reserve
588 * buffer space to the socket, by calling sbreserve(). This should commit
589 * some of the available buffer space in the system buffer pool for the
590 * socket (currently, it does nothing but enforce limits). The space
591 * should be released by calling ssb_release() when the socket is destroyed.
594 soreserve(struct socket *so, u_long sndcc, u_long rcvcc, struct rlimit *rl)
596 if (so->so_snd.ssb_lowat == 0)
597 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOLOWAT);
598 if (ssb_reserve(&so->so_snd, sndcc, so, rl) == 0)
600 if (ssb_reserve(&so->so_rcv, rcvcc, so, rl) == 0)
602 if (so->so_rcv.ssb_lowat == 0)
603 so->so_rcv.ssb_lowat = 1;
604 if (so->so_snd.ssb_lowat == 0)
605 so->so_snd.ssb_lowat = MCLBYTES;
606 if (so->so_snd.ssb_lowat > so->so_snd.ssb_hiwat)
607 so->so_snd.ssb_lowat = so->so_snd.ssb_hiwat;
610 ssb_release(&so->so_snd, so);
616 sysctl_handle_sb_max(SYSCTL_HANDLER_ARGS)
619 u_long old_sb_max = sb_max;
621 error = SYSCTL_OUT(req, arg1, sizeof(int));
622 if (error || !req->newptr)
624 error = SYSCTL_IN(req, arg1, sizeof(int));
627 if (sb_max < MSIZE + MCLBYTES) {
631 sb_max_adj = (u_quad_t)sb_max * MCLBYTES / (MSIZE + MCLBYTES);
636 * Allot mbufs to a signalsockbuf.
638 * Attempt to scale mbmax so that mbcnt doesn't become limiting
639 * if buffering efficiency is near the normal case.
641 * sb_max only applies to user-sockets (where rl != NULL). It does
642 * not apply to kernel sockets or kernel-controlled sockets. Note
643 * that NFS overrides the sockbuf limits created when nfsd creates
647 ssb_reserve(struct signalsockbuf *ssb, u_long cc, struct socket *so,
651 * rl will only be NULL when we're in an interrupt (eg, in tcp_input)
652 * or when called from netgraph (ie, ngd_attach)
654 if (rl && cc > sb_max_adj)
656 if (!chgsbsize(so->so_cred->cr_uidinfo, &ssb->ssb_hiwat, cc,
657 rl ? rl->rlim_cur : RLIM_INFINITY)) {
661 ssb->ssb_mbmax = min(cc * sb_efficiency, sb_max);
663 ssb->ssb_mbmax = cc * sb_efficiency;
666 * AUTOLOWAT is set on send buffers and prevents large writes
667 * from generating a huge number of context switches.
669 if (ssb->ssb_flags & SSB_AUTOLOWAT) {
670 ssb->ssb_lowat = ssb->ssb_hiwat / 2;
671 if (ssb->ssb_lowat < MCLBYTES)
672 ssb->ssb_lowat = MCLBYTES;
674 if (ssb->ssb_lowat > ssb->ssb_hiwat)
675 ssb->ssb_lowat = ssb->ssb_hiwat;
680 * Free mbufs held by a socket, and reserved mbuf space.
683 ssb_release(struct signalsockbuf *ssb, struct socket *so)
686 (void)chgsbsize(so->so_cred->cr_uidinfo, &ssb->ssb_hiwat, 0,
692 * Some routines that return EOPNOTSUPP for entry points that are not
693 * supported by a protocol. Fill in as needed.
696 pr_generic_notsupp(netmsg_t msg)
698 lwkt_replymsg(&msg->lmsg, EOPNOTSUPP);
702 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
703 struct mbuf *top, struct mbuf *control, int flags,
714 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
715 struct uio *uio, struct sockbuf *sio,
716 struct mbuf **controlp, int *flagsp)
722 * This isn't really a ``null'' operation, but it's the default one
723 * and doesn't do anything destructive.
726 pru_sense_null(netmsg_t msg)
728 msg->sense.nm_stat->st_blksize = msg->base.nm_so->so_snd.ssb_hiwat;
729 lwkt_replymsg(&msg->lmsg, 0);
733 * Make a copy of a sockaddr in a malloced buffer of type M_SONAME. Callers
734 * of this routine assume that it always succeeds, so we have to use a
735 * blockable allocation even though we might be called from a critical thread.
738 dup_sockaddr(const struct sockaddr *sa)
740 struct sockaddr *sa2;
742 sa2 = kmalloc(sa->sa_len, M_SONAME, M_INTWAIT);
743 bcopy(sa, sa2, sa->sa_len);
748 * Create an external-format (``xsocket'') structure using the information
749 * in the kernel-format socket structure pointed to by so. This is done
750 * to reduce the spew of irrelevant information over this interface,
751 * to isolate user code from changes in the kernel structure, and
752 * potentially to provide information-hiding if we decide that
753 * some of this information should be hidden from users.
756 sotoxsocket(struct socket *so, struct xsocket *xso)
758 xso->xso_len = sizeof *xso;
760 xso->so_type = so->so_type;
761 xso->so_options = so->so_options;
762 xso->so_linger = so->so_linger;
763 xso->so_state = so->so_state;
764 xso->so_pcb = so->so_pcb;
765 xso->xso_protocol = so->so_proto->pr_protocol;
766 xso->xso_family = so->so_proto->pr_domain->dom_family;
767 xso->so_qlen = so->so_qlen;
768 xso->so_incqlen = so->so_incqlen;
769 xso->so_qlimit = so->so_qlimit;
770 xso->so_timeo = so->so_timeo;
771 xso->so_error = so->so_error;
772 xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
773 xso->so_oobmark = so->so_oobmark;
774 ssbtoxsockbuf(&so->so_snd, &xso->so_snd);
775 ssbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
776 xso->so_uid = so->so_cred->cr_uid;
780 * Here is the definition of some of the basic objects in the kern.ipc
783 SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW, 0, "IPC");
786 * This takes the place of kern.maxsockbuf, which moved to kern.ipc.
788 * NOTE! sb_max only applies to user-created socket buffers.
791 SYSCTL_INT(_kern, KERN_DUMMY, dummy, CTLFLAG_RW, &dummy, 0, "");
792 SYSCTL_OID(_kern_ipc, KIPC_MAXSOCKBUF, maxsockbuf, CTLTYPE_INT|CTLFLAG_RW,
793 &sb_max, 0, sysctl_handle_sb_max, "I", "Maximum socket buffer size");
794 SYSCTL_INT(_kern_ipc, OID_AUTO, maxsockets, CTLFLAG_RD,
795 &maxsockets, 0, "Maximum number of sockets available");
796 SYSCTL_INT(_kern_ipc, KIPC_SOCKBUF_WASTE, sockbuf_waste_factor, CTLFLAG_RW,
798 "Socket buffer limit scaler");
801 * Initialize maxsockets
804 init_maxsockets(void *ignored)
806 TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
807 maxsockets = imax(maxsockets, imax(maxfiles, nmbclusters));
809 SYSINIT(param, SI_BOOT1_TUNABLES, SI_ORDER_ANY,
810 init_maxsockets, NULL);