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.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * @(#)uipc_socket2.c 8.1 (Berkeley) 6/10/93
31 * $FreeBSD: src/sys/kern/uipc_socket2.c,v 1.55.2.17 2002/08/31 19:04:55 dwmalone Exp $
34 #include "opt_param.h"
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/domain.h>
38 #include <sys/file.h> /* for maxfiles */
39 #include <sys/kernel.h>
42 #include <sys/malloc.h>
44 #include <sys/protosw.h>
45 #include <sys/resourcevar.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/socketops.h>
50 #include <sys/signalvar.h>
51 #include <sys/sysctl.h>
52 #include <sys/event.h>
54 #include <sys/msgport2.h>
55 #include <sys/socketvar2.h>
57 #include <net/netisr2.h>
60 #define KTR_SOWAKEUP KTR_ALL
62 KTR_INFO_MASTER(sowakeup);
63 KTR_INFO(KTR_SOWAKEUP, sowakeup, nconn_start, 0, "newconn sorwakeup start");
64 KTR_INFO(KTR_SOWAKEUP, sowakeup, nconn_end, 1, "newconn sorwakeup end");
65 KTR_INFO(KTR_SOWAKEUP, sowakeup, nconn_wakeupstart, 2, "newconn wakeup start");
66 KTR_INFO(KTR_SOWAKEUP, sowakeup, nconn_wakeupend, 3, "newconn wakeup end");
67 #define logsowakeup(name) KTR_LOG(sowakeup_ ## name)
72 * Primitive routines for operating on sockets and socket buffers
75 u_long sb_max = SB_MAX;
77 SB_MAX * MCLBYTES / (MSIZE + MCLBYTES); /* adjusted sb_max */
79 static u_long sb_efficiency = 8; /* parameter for sbreserve() */
81 /************************************************************************
82 * signalsockbuf procedures *
83 ************************************************************************/
86 * Wait for data to arrive at/drain from a socket buffer.
88 * NOTE: Caller must generally hold the ssb_lock (client side lock) since
89 * WAIT/WAKEUP only works for one client at a time.
91 * NOTE: Caller always retries whatever operation it was waiting on.
94 ssb_wait(struct signalsockbuf *ssb)
100 pflags = (ssb->ssb_flags & SSB_NOINTR) ? 0 : PCATCH;
103 flags = ssb->ssb_flags;
107 * WAKEUP and WAIT interlock each other. We can catch the
108 * race by checking to see if WAKEUP has already been set,
109 * and only setting WAIT if WAKEUP is clear.
111 if (flags & SSB_WAKEUP) {
112 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
113 flags & ~SSB_WAKEUP)) {
121 * Only set WAIT if WAKEUP is clear.
123 tsleep_interlock(&ssb->ssb_cc, pflags);
124 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
126 error = tsleep(&ssb->ssb_cc, pflags | PINTERLOCKED,
127 "sbwait", ssb->ssb_timeo);
135 * Lock a sockbuf already known to be locked;
136 * return any error returned from sleep (EINTR).
139 _ssb_lock(struct signalsockbuf *ssb)
145 pflags = (ssb->ssb_flags & SSB_NOINTR) ? 0 : PCATCH;
148 flags = ssb->ssb_flags;
150 if (flags & SSB_LOCK) {
151 tsleep_interlock(&ssb->ssb_flags, pflags);
152 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
154 error = tsleep(&ssb->ssb_flags,
155 pflags | PINTERLOCKED,
161 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
163 lwkt_gettoken(&ssb->ssb_token);
173 * This does the same for sockbufs. Note that the xsockbuf structure,
174 * since it is always embedded in a socket, does not include a self
175 * pointer nor a length. We make this entry point public in case
176 * some other mechanism needs it.
179 ssbtoxsockbuf(struct signalsockbuf *ssb, struct xsockbuf *xsb)
181 xsb->sb_cc = ssb->ssb_cc;
182 xsb->sb_hiwat = ssb->ssb_hiwat;
183 xsb->sb_mbcnt = ssb->ssb_mbcnt;
184 xsb->sb_mbmax = ssb->ssb_mbmax;
185 xsb->sb_lowat = ssb->ssb_lowat;
186 xsb->sb_flags = ssb->ssb_flags;
187 xsb->sb_timeo = ssb->ssb_timeo;
191 /************************************************************************
192 * Procedures which manipulate socket state flags, wakeups, etc. *
193 ************************************************************************
195 * Normal sequence from the active (originating) side is that
196 * soisconnecting() is called during processing of connect() call, resulting
197 * in an eventual call to soisconnected() if/when the connection is
198 * established. When the connection is torn down soisdisconnecting() is
199 * called during processing of disconnect() call, and soisdisconnected() is
200 * called when the connection to the peer is totally severed.
202 * The semantics of these routines are such that connectionless protocols
203 * can call soisconnected() and soisdisconnected() only, bypassing the
204 * in-progress calls when setting up a ``connection'' takes no time.
206 * From the passive side, a socket is created with two queues of sockets:
207 * so_incomp for connections in progress and so_comp for connections
208 * already made and awaiting user acceptance. As a protocol is preparing
209 * incoming connections, it creates a socket structure queued on so_incomp
210 * by calling sonewconn(). When the connection is established,
211 * soisconnected() is called, and transfers the socket structure to so_comp,
212 * making it available to accept().
214 * If a socket is closed with sockets on either so_incomp or so_comp, these
215 * sockets are dropped.
217 * If higher level protocols are implemented in the kernel, the wakeups
218 * done here will sometimes cause software-interrupt process scheduling.
222 soisconnecting(struct socket *so)
224 soclrstate(so, SS_ISCONNECTED | SS_ISDISCONNECTING);
225 sosetstate(so, SS_ISCONNECTING);
229 soisconnected(struct socket *so)
233 while ((head = so->so_head) != NULL) {
234 lwkt_getpooltoken(head);
235 if (so->so_head == head)
237 lwkt_relpooltoken(head);
240 soclrstate(so, SS_ISCONNECTING | SS_ISDISCONNECTING | SS_ISCONFIRMING);
241 sosetstate(so, SS_ISCONNECTED);
242 if (head && (so->so_state & SS_INCOMP)) {
243 if ((so->so_options & SO_ACCEPTFILTER) != 0) {
244 so->so_upcall = head->so_accf->so_accept_filter->accf_callback;
245 so->so_upcallarg = head->so_accf->so_accept_filter_arg;
246 atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
247 so->so_options &= ~SO_ACCEPTFILTER;
248 so->so_upcall(so, so->so_upcallarg, 0);
249 lwkt_relpooltoken(head);
254 * Listen socket are not per-cpu.
256 KKASSERT((so->so_state & (SS_COMP | SS_INCOMP)) == SS_INCOMP);
257 TAILQ_REMOVE(&head->so_incomp, so, so_list);
259 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
261 sosetstate(so, SS_COMP);
262 soclrstate(so, SS_INCOMP);
265 * XXX head may be on a different protocol thread.
266 * sorwakeup()->sowakeup() is hacked atm.
269 wakeup_one(&head->so_timeo);
271 wakeup(&so->so_timeo);
276 lwkt_relpooltoken(head);
280 soisdisconnecting(struct socket *so)
282 soclrstate(so, SS_ISCONNECTING);
283 sosetstate(so, SS_ISDISCONNECTING | SS_CANTRCVMORE | SS_CANTSENDMORE);
284 wakeup((caddr_t)&so->so_timeo);
290 soisdisconnected(struct socket *so)
292 soclrstate(so, SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING);
293 sosetstate(so, SS_CANTRCVMORE | SS_CANTSENDMORE | SS_ISDISCONNECTED);
294 wakeup((caddr_t)&so->so_timeo);
295 sbdrop(&so->so_snd.sb, so->so_snd.ssb_cc);
301 soisreconnecting(struct socket *so)
303 soclrstate(so, SS_ISDISCONNECTING | SS_ISDISCONNECTED |
304 SS_CANTRCVMORE | SS_CANTSENDMORE);
305 sosetstate(so, SS_ISCONNECTING);
309 soisreconnected(struct socket *so)
311 soclrstate(so, SS_ISDISCONNECTED | SS_CANTRCVMORE | SS_CANTSENDMORE);
316 * Set or change the message port a socket receives commands on.
321 sosetport(struct socket *so, lwkt_port_t port)
327 * When an attempt at a new connection is noted on a socket
328 * which accepts connections, sonewconn is called. If the
329 * connection is possible (subject to space constraints, etc.)
330 * then we allocate a new structure, propoerly linked into the
331 * data structure of the original socket, and return this.
332 * Connstatus may be 0, or SO_ISCONFIRMING, or SO_ISCONNECTED.
334 * The new socket is returned with one ref and so_pcb assigned.
335 * The reference is implied by so_pcb.
338 sonewconn_faddr(struct socket *head, int connstatus,
339 const struct sockaddr *faddr, boolean_t keep_ref)
343 struct pru_attach_info ai;
345 if (head->so_qlen > 3 * head->so_qlimit / 2)
347 so = soalloc(1, head->so_proto);
352 * Set the port prior to attaching the inpcb to the current
353 * cpu's protocol thread (which should be the current thread
354 * but might not be in all cases). This serializes any pcb ops
355 * which occur to our cpu allowing us to complete the attachment
356 * without racing anything.
358 if (head->so_proto->pr_flags & PR_SYNC_PORT)
359 sosetport(so, &netisr_sync_port);
361 sosetport(so, netisr_cpuport(mycpuid));
362 if ((head->so_options & SO_ACCEPTFILTER) != 0)
365 so->so_type = head->so_type;
366 so->so_options = head->so_options &~ SO_ACCEPTCONN;
367 so->so_linger = head->so_linger;
370 * NOTE: Clearing NOFDREF implies referencing the so with
373 so->so_state = head->so_state | SS_NOFDREF | SS_ASSERTINPROG;
374 so->so_cred = crhold(head->so_cred);
377 ai.fd_rdir = NULL; /* jail code cruft XXX JH */
380 * Reserve space and call pru_attach. We can direct-call the
381 * function since we're already in the protocol thread.
383 if (soreserve(so, head->so_snd.ssb_hiwat,
384 head->so_rcv.ssb_hiwat, NULL) ||
385 so_pru_attach_direct(so, 0, &ai)) {
387 soclrstate(so, SS_ASSERTINPROG);
388 sofree(so); /* remove implied pcb ref */
391 KKASSERT(((so->so_proto->pr_flags & PR_ASYNC_RCVD) == 0 &&
392 so->so_refs == 2) || /* attach + our base ref */
393 ((so->so_proto->pr_flags & PR_ASYNC_RCVD) &&
394 so->so_refs == 3)); /* + async rcvd ref */
397 * Keep the reference; caller will free it.
402 KKASSERT(so->so_port != NULL);
403 so->so_rcv.ssb_lowat = head->so_rcv.ssb_lowat;
404 so->so_snd.ssb_lowat = head->so_snd.ssb_lowat;
405 so->so_rcv.ssb_timeo = head->so_rcv.ssb_timeo;
406 so->so_snd.ssb_timeo = head->so_snd.ssb_timeo;
408 if (head->so_rcv.ssb_flags & SSB_AUTOLOWAT)
409 so->so_rcv.ssb_flags |= SSB_AUTOLOWAT;
411 so->so_rcv.ssb_flags &= ~SSB_AUTOLOWAT;
413 if (head->so_snd.ssb_flags & SSB_AUTOLOWAT)
414 so->so_snd.ssb_flags |= SSB_AUTOLOWAT;
416 so->so_snd.ssb_flags &= ~SSB_AUTOLOWAT;
418 if (head->so_rcv.ssb_flags & SSB_AUTOSIZE)
419 so->so_rcv.ssb_flags |= SSB_AUTOSIZE;
421 so->so_rcv.ssb_flags &= ~SSB_AUTOSIZE;
423 if (head->so_snd.ssb_flags & SSB_AUTOSIZE)
424 so->so_snd.ssb_flags |= SSB_AUTOSIZE;
426 so->so_snd.ssb_flags &= ~SSB_AUTOSIZE;
429 * Save the faddr, if the information is provided and
430 * the protocol can perform the saving opertation.
432 if (faddr != NULL && so->so_proto->pr_usrreqs->pru_savefaddr != NULL)
433 so->so_proto->pr_usrreqs->pru_savefaddr(so, faddr);
435 lwkt_getpooltoken(head);
437 KKASSERT((so->so_state & (SS_INCOMP | SS_COMP)) == 0);
438 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
441 * Set connstatus within head token, so that the accepted
442 * socket will have connstatus (SS_ISCONNECTED) set.
444 sosetstate(so, SS_COMP | connstatus);
446 if (head->so_incqlen > head->so_qlimit) {
447 sp = TAILQ_FIRST(&head->so_incomp);
448 KKASSERT((sp->so_state & (SS_INCOMP | SS_COMP)) ==
450 TAILQ_REMOVE(&head->so_incomp, sp, so_list);
452 soclrstate(sp, SS_INCOMP);
453 soabort_async(sp, TRUE);
455 KKASSERT((so->so_state & (SS_INCOMP | SS_COMP)) == 0);
456 TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
458 sosetstate(so, SS_INCOMP);
461 * Clear SS_ASSERTINPROG within head token, so that it will not
462 * race against accept-close or abort for "synchronous" sockets,
463 * e.g. unix socket, on other CPUs.
465 soclrstate(so, SS_ASSERTINPROG);
466 lwkt_relpooltoken(head);
470 * XXX head may be on a different protocol thread.
471 * sorwakeup()->sowakeup() is hacked atm.
473 logsowakeup(nconn_start);
475 logsowakeup(nconn_end);
477 logsowakeup(nconn_wakeupstart);
478 wakeup((caddr_t)&head->so_timeo);
479 logsowakeup(nconn_wakeupend);
485 sonewconn(struct socket *head, int connstatus)
487 return sonewconn_faddr(head, connstatus, NULL, FALSE /* don't ref */);
491 * Socantsendmore indicates that no more data will be sent on the
492 * socket; it would normally be applied to a socket when the user
493 * informs the system that no more data is to be sent, by the protocol
494 * code (in case PRU_SHUTDOWN). Socantrcvmore indicates that no more data
495 * will be received, and will normally be applied to the socket by a
496 * protocol when it detects that the peer will send no more data.
497 * Data queued for reading in the socket may yet be read.
500 socantsendmore(struct socket *so)
502 sosetstate(so, SS_CANTSENDMORE);
507 socantrcvmore(struct socket *so)
509 sosetstate(so, SS_CANTRCVMORE);
514 * Wakeup processes waiting on a socket buffer. Do asynchronous notification
515 * via SIGIO if the socket has the SS_ASYNC flag set.
517 * For users waiting on send/recv try to avoid unnecessary context switch
518 * thrashing. Particularly for senders of large buffers (needs to be
519 * extended to sel and aio? XXX)
521 * WARNING! Can be called on a foreign socket from the wrong protocol
522 * thread. aka is called on the 'head' listen socket when
523 * a new connection comes in.
527 sowakeup(struct socket *so, struct signalsockbuf *ssb)
532 * Atomically check the flags. When no special features are being
533 * used, WAIT is clear, and WAKEUP is already set, we can simply
534 * return. The upcoming synchronous waiter will not block.
536 flags = atomic_fetchadd_int(&ssb->ssb_flags, 0);
537 if ((flags & SSB_NOTIFY_MASK) == 0) {
538 if (flags & SSB_WAKEUP)
543 * Check conditions, set the WAKEUP flag, and clear and signal if
544 * the WAIT flag is found to be set. This interlocks against the
550 flags = ssb->ssb_flags;
552 if (ssb->ssb_flags & SSB_PREALLOC)
553 space = ssb_space_prealloc(ssb);
555 space = ssb_space(ssb);
557 if ((ssb == &so->so_snd && space >= ssb->ssb_lowat) ||
558 (ssb == &so->so_rcv && ssb->ssb_cc >= ssb->ssb_lowat) ||
559 (ssb == &so->so_snd && (so->so_state & SS_CANTSENDMORE)) ||
560 (ssb == &so->so_rcv && (so->so_state & SS_CANTRCVMORE))
562 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
563 (flags | SSB_WAKEUP) & ~SSB_WAIT)) {
564 if (flags & SSB_WAIT)
565 wakeup(&ssb->ssb_cc);
576 if ((so->so_state & SS_ASYNC) && so->so_sigio != NULL)
577 pgsigio(so->so_sigio, SIGIO, 0);
578 if (ssb->ssb_flags & SSB_UPCALL)
579 (*so->so_upcall)(so, so->so_upcallarg, M_NOWAIT);
580 KNOTE(&ssb->ssb_kq.ki_note, 0);
583 * This is a bit of a hack. Multiple threads can wind up scanning
584 * ssb_mlist concurrently due to the fact that this function can be
585 * called on a foreign socket, so we can't afford to block here.
587 * We need the pool token for (so) (likely the listne socket if
588 * SSB_MEVENT is set) because the predicate function may have
589 * to access the accept queue.
591 if (ssb->ssb_flags & SSB_MEVENT) {
592 struct netmsg_so_notify *msg, *nmsg;
594 lwkt_getpooltoken(so);
595 TAILQ_FOREACH_MUTABLE(msg, &ssb->ssb_mlist, nm_list, nmsg) {
596 if (msg->nm_predicate(msg)) {
597 TAILQ_REMOVE(&ssb->ssb_mlist, msg, nm_list);
598 lwkt_replymsg(&msg->base.lmsg,
599 msg->base.lmsg.ms_error);
602 if (TAILQ_EMPTY(&ssb->ssb_mlist))
603 atomic_clear_int(&ssb->ssb_flags, SSB_MEVENT);
604 lwkt_relpooltoken(so);
609 * Socket buffer (struct signalsockbuf) utility routines.
611 * Each socket contains two socket buffers: one for sending data and
612 * one for receiving data. Each buffer contains a queue of mbufs,
613 * information about the number of mbufs and amount of data in the
614 * queue, and other fields allowing kevent()/select()/poll() statements
615 * and notification on data availability to be implemented.
617 * Data stored in a socket buffer is maintained as a list of records.
618 * Each record is a list of mbufs chained together with the m_next
619 * field. Records are chained together with the m_nextpkt field. The upper
620 * level routine soreceive() expects the following conventions to be
621 * observed when placing information in the receive buffer:
623 * 1. If the protocol requires each message be preceded by the sender's
624 * name, then a record containing that name must be present before
625 * any associated data (mbuf's must be of type MT_SONAME).
626 * 2. If the protocol supports the exchange of ``access rights'' (really
627 * just additional data associated with the message), and there are
628 * ``rights'' to be received, then a record containing this data
629 * should be present (mbuf's must be of type MT_RIGHTS).
630 * 3. If a name or rights record exists, then it must be followed by
631 * a data record, perhaps of zero length.
633 * Before using a new socket structure it is first necessary to reserve
634 * buffer space to the socket, by calling sbreserve(). This should commit
635 * some of the available buffer space in the system buffer pool for the
636 * socket (currently, it does nothing but enforce limits). The space
637 * should be released by calling ssb_release() when the socket is destroyed.
640 soreserve(struct socket *so, u_long sndcc, u_long rcvcc, struct rlimit *rl)
642 if (so->so_snd.ssb_lowat == 0)
643 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOLOWAT);
644 if (ssb_reserve(&so->so_snd, sndcc, so, rl) == 0)
646 if (ssb_reserve(&so->so_rcv, rcvcc, so, rl) == 0)
648 if (so->so_rcv.ssb_lowat == 0)
649 so->so_rcv.ssb_lowat = 1;
650 if (so->so_snd.ssb_lowat == 0)
651 so->so_snd.ssb_lowat = MCLBYTES;
652 if (so->so_snd.ssb_lowat > so->so_snd.ssb_hiwat)
653 so->so_snd.ssb_lowat = so->so_snd.ssb_hiwat;
656 ssb_release(&so->so_snd, so);
662 sysctl_handle_sb_max(SYSCTL_HANDLER_ARGS)
665 u_long old_sb_max = sb_max;
667 error = SYSCTL_OUT(req, arg1, sizeof(int));
668 if (error || !req->newptr)
670 error = SYSCTL_IN(req, arg1, sizeof(int));
673 if (sb_max < MSIZE + MCLBYTES) {
677 sb_max_adj = (u_quad_t)sb_max * MCLBYTES / (MSIZE + MCLBYTES);
682 * Allot mbufs to a signalsockbuf.
684 * Attempt to scale mbmax so that mbcnt doesn't become limiting
685 * if buffering efficiency is near the normal case.
687 * sb_max only applies to user-sockets (where rl != NULL). It does
688 * not apply to kernel sockets or kernel-controlled sockets. Note
689 * that NFS overrides the sockbuf limits created when nfsd creates
693 ssb_reserve(struct signalsockbuf *ssb, u_long cc, struct socket *so,
697 * rl will only be NULL when we're in an interrupt (eg, in tcp_input)
698 * or when called from netgraph (ie, ngd_attach)
700 if (rl && cc > sb_max_adj)
702 if (!chgsbsize(so->so_cred->cr_uidinfo, &ssb->ssb_hiwat, cc,
703 rl ? rl->rlim_cur : RLIM_INFINITY)) {
707 ssb->ssb_mbmax = min(cc * sb_efficiency, sb_max);
709 ssb->ssb_mbmax = cc * sb_efficiency;
712 * AUTOLOWAT is set on send buffers and prevents large writes
713 * from generating a huge number of context switches.
715 if (ssb->ssb_flags & SSB_AUTOLOWAT) {
716 ssb->ssb_lowat = ssb->ssb_hiwat / 4;
717 if (ssb->ssb_lowat < MCLBYTES)
718 ssb->ssb_lowat = MCLBYTES;
720 if (ssb->ssb_lowat > ssb->ssb_hiwat)
721 ssb->ssb_lowat = ssb->ssb_hiwat;
726 * Free mbufs held by a socket, and reserved mbuf space.
729 ssb_release(struct signalsockbuf *ssb, struct socket *so)
732 (void)chgsbsize(so->so_cred->cr_uidinfo, &ssb->ssb_hiwat, 0,
738 * Some routines that return EOPNOTSUPP for entry points that are not
739 * supported by a protocol. Fill in as needed.
742 pr_generic_notsupp(netmsg_t msg)
744 lwkt_replymsg(&msg->lmsg, EOPNOTSUPP);
748 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
749 struct mbuf *top, struct mbuf *control, int flags,
760 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
761 struct uio *uio, struct sockbuf *sio,
762 struct mbuf **controlp, int *flagsp)
768 * This isn't really a ``null'' operation, but it's the default one
769 * and doesn't do anything destructive.
772 pru_sense_null(netmsg_t msg)
774 msg->sense.nm_stat->st_blksize = msg->base.nm_so->so_snd.ssb_hiwat;
775 lwkt_replymsg(&msg->lmsg, 0);
779 * Make a copy of a sockaddr in a malloced buffer of type M_SONAME. Callers
780 * of this routine assume that it always succeeds, so we have to use a
781 * blockable allocation even though we might be called from a critical thread.
784 dup_sockaddr(const struct sockaddr *sa)
786 struct sockaddr *sa2;
788 sa2 = kmalloc(sa->sa_len, M_SONAME, M_INTWAIT);
789 bcopy(sa, sa2, sa->sa_len);
794 * Create an external-format (``xsocket'') structure using the information
795 * in the kernel-format socket structure pointed to by so. This is done
796 * to reduce the spew of irrelevant information over this interface,
797 * to isolate user code from changes in the kernel structure, and
798 * potentially to provide information-hiding if we decide that
799 * some of this information should be hidden from users.
802 sotoxsocket(struct socket *so, struct xsocket *xso)
804 xso->xso_len = sizeof *xso;
806 xso->so_type = so->so_type;
807 xso->so_options = so->so_options;
808 xso->so_linger = so->so_linger;
809 xso->so_state = so->so_state;
810 xso->so_pcb = so->so_pcb;
811 xso->xso_protocol = so->so_proto->pr_protocol;
812 xso->xso_family = so->so_proto->pr_domain->dom_family;
813 xso->so_qlen = so->so_qlen;
814 xso->so_incqlen = so->so_incqlen;
815 xso->so_qlimit = so->so_qlimit;
816 xso->so_timeo = so->so_timeo;
817 xso->so_error = so->so_error;
818 xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
819 xso->so_oobmark = so->so_oobmark;
820 ssbtoxsockbuf(&so->so_snd, &xso->so_snd);
821 ssbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
822 xso->so_uid = so->so_cred->cr_uid;
826 * Here is the definition of some of the basic objects in the kern.ipc
829 SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW, 0, "IPC");
832 * This takes the place of kern.maxsockbuf, which moved to kern.ipc.
834 * NOTE! sb_max only applies to user-created socket buffers.
837 SYSCTL_INT(_kern, KERN_DUMMY, dummy, CTLFLAG_RW, &dummy, 0, "");
838 SYSCTL_OID(_kern_ipc, KIPC_MAXSOCKBUF, maxsockbuf, CTLTYPE_INT|CTLFLAG_RW,
839 &sb_max, 0, sysctl_handle_sb_max, "I", "Maximum socket buffer size");
840 SYSCTL_INT(_kern_ipc, OID_AUTO, maxsockets, CTLFLAG_RD,
841 &maxsockets, 0, "Maximum number of sockets available");
842 SYSCTL_INT(_kern_ipc, KIPC_SOCKBUF_WASTE, sockbuf_waste_factor, CTLFLAG_RW,
844 "Socket buffer limit scaler");
847 * Initialize maxsockets
850 init_maxsockets(void *ignored)
852 TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
853 maxsockets = imax(maxsockets, imax(maxfiles, nmbclusters));
855 SYSINIT(param, SI_BOOT1_TUNABLES, SI_ORDER_ANY,
856 init_maxsockets, NULL);