2 * Copyright (c) 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1982, 1986, 1988, 1990, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
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48 * This product includes software developed by the University of
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50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
67 * $FreeBSD: src/sys/kern/uipc_socket.c,v 1.68.2.24 2003/11/11 17:18:18 silby Exp $
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/fcntl.h>
76 #include <sys/malloc.h>
78 #include <sys/domain.h>
79 #include <sys/file.h> /* for struct knote */
80 #include <sys/kernel.h>
81 #include <sys/event.h>
83 #include <sys/protosw.h>
84 #include <sys/socket.h>
85 #include <sys/socketvar.h>
86 #include <sys/socketops.h>
87 #include <sys/resourcevar.h>
88 #include <sys/signalvar.h>
89 #include <sys/sysctl.h>
92 #include <vm/vm_zone.h>
95 #include <sys/thread2.h>
96 #include <sys/socketvar2.h>
98 #include <machine/limits.h>
101 static int do_setopt_accept_filter(struct socket *so, struct sockopt *sopt);
104 static void filt_sordetach(struct knote *kn);
105 static int filt_soread(struct knote *kn, long hint);
106 static void filt_sowdetach(struct knote *kn);
107 static int filt_sowrite(struct knote *kn, long hint);
108 static int filt_solisten(struct knote *kn, long hint);
110 static struct filterops solisten_filtops =
111 { FILTEROP_ISFD, NULL, filt_sordetach, filt_solisten };
112 static struct filterops soread_filtops =
113 { FILTEROP_ISFD, NULL, filt_sordetach, filt_soread };
114 static struct filterops sowrite_filtops =
115 { FILTEROP_ISFD, NULL, filt_sowdetach, filt_sowrite };
116 static struct filterops soexcept_filtops =
117 { FILTEROP_ISFD, NULL, filt_sordetach, filt_soread };
119 MALLOC_DEFINE(M_SOCKET, "socket", "socket struct");
120 MALLOC_DEFINE(M_SONAME, "soname", "socket name");
121 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
124 static int somaxconn = SOMAXCONN;
125 SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW,
126 &somaxconn, 0, "Maximum pending socket connection queue size");
129 * Socket operation routines.
130 * These routines are called by the routines in
131 * sys_socket.c or from a system process, and
132 * implement the semantics of socket operations by
133 * switching out to the protocol specific routines.
137 * Get a socket structure, and initialize it.
138 * Note that it would probably be better to allocate socket
139 * and PCB at the same time, but I'm not convinced that all
140 * the protocols can be easily modified to do this.
148 waitmask = waitok ? M_WAITOK : M_NOWAIT;
149 so = kmalloc(sizeof(struct socket), M_SOCKET, M_ZERO|waitmask);
151 /* XXX race condition for reentrant kernel */
152 TAILQ_INIT(&so->so_aiojobq);
153 TAILQ_INIT(&so->so_rcv.ssb_kq.ki_mlist);
154 TAILQ_INIT(&so->so_snd.ssb_kq.ki_mlist);
155 lwkt_token_init(&so->so_rcv.ssb_token, "rcvtok");
156 lwkt_token_init(&so->so_snd.ssb_token, "sndtok");
157 so->so_state = SS_NOFDREF;
164 socreate(int dom, struct socket **aso, int type,
165 int proto, struct thread *td)
167 struct proc *p = td->td_proc;
170 struct pru_attach_info ai;
174 prp = pffindproto(dom, proto, type);
176 prp = pffindtype(dom, type);
178 if (prp == 0 || prp->pr_usrreqs->pru_attach == 0)
179 return (EPROTONOSUPPORT);
181 if (p->p_ucred->cr_prison && jail_socket_unixiproute_only &&
182 prp->pr_domain->dom_family != PF_LOCAL &&
183 prp->pr_domain->dom_family != PF_INET &&
184 prp->pr_domain->dom_family != PF_INET6 &&
185 prp->pr_domain->dom_family != PF_ROUTE) {
186 return (EPROTONOSUPPORT);
189 if (prp->pr_type != type)
191 so = soalloc(p != 0);
196 * Callers of socreate() presumably will connect up a descriptor
197 * and call soclose() if they cannot. This represents our so_refs
198 * (which should be 1) from soalloc().
200 soclrstate(so, SS_NOFDREF);
203 * Set a default port for protocol processing. No action will occur
204 * on the socket on this port until an inpcb is attached to it and
205 * is able to match incoming packets, or until the socket becomes
206 * available to userland.
208 * We normally default the socket to the protocol thread on cpu 0.
209 * If PR_SYNC_PORT is set (unix domain sockets) there is no protocol
210 * thread and all pr_*()/pru_*() calls are executed synchronously.
212 if (prp->pr_flags & PR_SYNC_PORT)
213 so->so_port = &netisr_sync_port;
215 so->so_port = cpu_portfn(0);
217 TAILQ_INIT(&so->so_incomp);
218 TAILQ_INIT(&so->so_comp);
220 so->so_cred = crhold(p->p_ucred);
222 ai.sb_rlimit = &p->p_rlimit[RLIMIT_SBSIZE];
223 ai.p_ucred = p->p_ucred;
224 ai.fd_rdir = p->p_fd->fd_rdir;
227 * Auto-sizing of socket buffers is managed by the protocols and
228 * the appropriate flags must be set in the pru_attach function.
230 error = so_pru_attach(so, proto, &ai);
232 sosetstate(so, SS_NOFDREF);
233 sofree(so); /* from soalloc */
238 * NOTE: Returns referenced socket.
245 sobind(struct socket *so, struct sockaddr *nam, struct thread *td)
249 error = so_pru_bind(so, nam, td);
254 sodealloc(struct socket *so)
256 if (so->so_rcv.ssb_hiwat)
257 (void)chgsbsize(so->so_cred->cr_uidinfo,
258 &so->so_rcv.ssb_hiwat, 0, RLIM_INFINITY);
259 if (so->so_snd.ssb_hiwat)
260 (void)chgsbsize(so->so_cred->cr_uidinfo,
261 &so->so_snd.ssb_hiwat, 0, RLIM_INFINITY);
263 /* remove accept filter if present */
264 if (so->so_accf != NULL)
265 do_setopt_accept_filter(so, NULL);
272 solisten(struct socket *so, int backlog, struct thread *td)
276 short oldopt, oldqlimit;
279 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING))
283 oldopt = so->so_options;
284 oldqlimit = so->so_qlimit;
287 lwkt_gettoken(&so->so_rcv.ssb_token);
288 if (TAILQ_EMPTY(&so->so_comp))
289 so->so_options |= SO_ACCEPTCONN;
290 lwkt_reltoken(&so->so_rcv.ssb_token);
291 if (backlog < 0 || backlog > somaxconn)
293 so->so_qlimit = backlog;
294 /* SCTP needs to look at tweak both the inbound backlog parameter AND
295 * the so_options (UDP model both connect's and gets inbound
296 * connections .. implicitly).
298 error = so_pru_listen(so, td);
301 /* Restore the params */
302 so->so_options = oldopt;
303 so->so_qlimit = oldqlimit;
311 * Destroy a disconnected socket. This routine is a NOP if entities
312 * still have a reference on the socket:
314 * so_pcb - The protocol stack still has a reference
315 * SS_NOFDREF - There is no longer a file pointer reference
318 sofree(struct socket *so)
323 * This is a bit hackish at the moment. We need to interlock
324 * any accept queue we are on before we potentially lose the
325 * last reference to avoid races against a re-reference from
326 * someone operating on the queue.
328 while ((head = so->so_head) != NULL) {
329 lwkt_getpooltoken(head);
330 if (so->so_head == head)
332 lwkt_relpooltoken(head);
336 * Arbitrage the last free.
338 KKASSERT(so->so_refs > 0);
339 if (atomic_fetchadd_int(&so->so_refs, -1) != 1) {
341 lwkt_relpooltoken(head);
345 KKASSERT(so->so_pcb == NULL && (so->so_state & SS_NOFDREF));
346 KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
349 * We're done, remove ourselves from the accept queue we are
350 * on, if we are on one.
353 if (so->so_state & SS_INCOMP) {
354 TAILQ_REMOVE(&head->so_incomp, so, so_list);
356 } else if (so->so_state & SS_COMP) {
358 * We must not decommission a socket that's
359 * on the accept(2) queue. If we do, then
360 * accept(2) may hang after select(2) indicated
361 * that the listening socket was ready.
363 lwkt_relpooltoken(head);
366 panic("sofree: not queued");
368 soclrstate(so, SS_INCOMP);
370 lwkt_relpooltoken(head);
372 ssb_release(&so->so_snd, so);
378 * Close a socket on last file table reference removal.
379 * Initiate disconnect if connected.
380 * Free socket when disconnect complete.
383 soclose(struct socket *so, int fflag)
387 funsetown(&so->so_sigio);
388 if (so->so_pcb == NULL)
390 if (so->so_state & SS_ISCONNECTED) {
391 if ((so->so_state & SS_ISDISCONNECTING) == 0) {
392 error = sodisconnect(so);
396 if (so->so_options & SO_LINGER) {
397 if ((so->so_state & SS_ISDISCONNECTING) &&
400 while (so->so_state & SS_ISCONNECTED) {
401 error = tsleep(&so->so_timeo, PCATCH,
402 "soclos", so->so_linger * hz);
412 error2 = so_pru_detach(so);
417 lwkt_getpooltoken(so);
418 if (so->so_options & SO_ACCEPTCONN) {
421 while ((sp = TAILQ_FIRST(&so->so_incomp)) != NULL) {
422 TAILQ_REMOVE(&so->so_incomp, sp, so_list);
423 soclrstate(sp, SS_INCOMP);
428 while ((sp = TAILQ_FIRST(&so->so_comp)) != NULL) {
429 TAILQ_REMOVE(&so->so_comp, sp, so_list);
430 soclrstate(sp, SS_COMP);
436 lwkt_relpooltoken(so);
437 if (so->so_state & SS_NOFDREF)
438 panic("soclose: NOFDREF");
439 sosetstate(so, SS_NOFDREF); /* take ref */
440 sofree(so); /* dispose of ref */
445 * Abort and destroy a socket. Only one abort can be in progress
446 * at any given moment.
449 soabort(struct socket *so)
456 soaborta(struct socket *so)
463 soabort_oncpu(struct socket *so)
466 so_pru_abort_oncpu(so);
470 * so is passed in ref'd, which becomes owned by
471 * the cleared SS_NOFDREF flag.
474 soaccept(struct socket *so, struct sockaddr **nam)
478 if ((so->so_state & SS_NOFDREF) == 0)
479 panic("soaccept: !NOFDREF");
480 soclrstate(so, SS_NOFDREF); /* owned by lack of SS_NOFDREF */
481 error = so_pru_accept_direct(so, nam);
486 soconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
490 if (so->so_options & SO_ACCEPTCONN)
493 * If protocol is connection-based, can only connect once.
494 * Otherwise, if connected, try to disconnect first.
495 * This allows user to disconnect by connecting to, e.g.,
498 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
499 ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
500 (error = sodisconnect(so)))) {
504 * Prevent accumulated error from previous connection
508 error = so_pru_connect(so, nam, td);
514 soconnect2(struct socket *so1, struct socket *so2)
518 error = so_pru_connect2(so1, so2);
523 sodisconnect(struct socket *so)
527 if ((so->so_state & SS_ISCONNECTED) == 0) {
531 if (so->so_state & SS_ISDISCONNECTING) {
535 error = so_pru_disconnect(so);
540 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
543 * If send must go all at once and message is larger than
544 * send buffering, then hard error.
545 * Lock against other senders.
546 * If must go all at once and not enough room now, then
547 * inform user that this would block and do nothing.
548 * Otherwise, if nonblocking, send as much as possible.
549 * The data to be sent is described by "uio" if nonzero,
550 * otherwise by the mbuf chain "top" (which must be null
551 * if uio is not). Data provided in mbuf chain must be small
552 * enough to send all at once.
554 * Returns nonzero on error, timeout or signal; callers
555 * must check for short counts if EINTR/ERESTART are returned.
556 * Data and control buffers are freed on return.
559 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
560 struct mbuf *top, struct mbuf *control, int flags,
567 int clen = 0, error, dontroute, mlen;
568 int atomic = sosendallatonce(so) || top;
572 resid = uio->uio_resid;
574 resid = (size_t)top->m_pkthdr.len;
577 for (m = top; m; m = m->m_next)
579 KKASSERT(top->m_pkthdr.len == len);
584 * WARNING! resid is unsigned, space and len are signed. space
585 * can wind up negative if the sockbuf is overcommitted.
587 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
588 * type sockets since that's an error.
590 if (so->so_type == SOCK_STREAM && (flags & MSG_EOR)) {
596 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
597 (so->so_proto->pr_flags & PR_ATOMIC);
598 if (td->td_lwp != NULL)
599 td->td_lwp->lwp_ru.ru_msgsnd++;
601 clen = control->m_len;
602 #define gotoerr(errcode) { error = errcode; goto release; }
605 error = ssb_lock(&so->so_snd, SBLOCKWAIT(flags));
610 if (so->so_state & SS_CANTSENDMORE)
613 error = so->so_error;
617 if ((so->so_state & SS_ISCONNECTED) == 0) {
619 * `sendto' and `sendmsg' is allowed on a connection-
620 * based socket if it supports implied connect.
621 * Return ENOTCONN if not connected and no address is
624 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
625 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
626 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
627 !(resid == 0 && clen != 0))
629 } else if (addr == 0)
630 gotoerr(so->so_proto->pr_flags & PR_CONNREQUIRED ?
631 ENOTCONN : EDESTADDRREQ);
633 if ((atomic && resid > so->so_snd.ssb_hiwat) ||
634 clen > so->so_snd.ssb_hiwat) {
637 space = ssb_space(&so->so_snd);
640 if ((space < 0 || (size_t)space < resid + clen) && uio &&
641 (atomic || space < so->so_snd.ssb_lowat || space < clen)) {
642 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT))
643 gotoerr(EWOULDBLOCK);
644 ssb_unlock(&so->so_snd);
645 error = ssb_wait(&so->so_snd);
655 * Data is prepackaged in "top".
659 top->m_flags |= M_EOR;
663 m = m_getl((int)resid, MB_WAIT, MT_DATA,
664 top == NULL ? M_PKTHDR : 0, &mlen);
667 m->m_pkthdr.rcvif = NULL;
669 len = imin((int)szmin(mlen, resid), space);
670 if (resid < MINCLSIZE) {
672 * For datagram protocols, leave room
673 * for protocol headers in first mbuf.
675 if (atomic && top == 0 && len < mlen)
679 error = uiomove(mtod(m, caddr_t), (size_t)len, uio);
680 resid = uio->uio_resid;
683 top->m_pkthdr.len += len;
689 top->m_flags |= M_EOR;
692 } while (space > 0 && atomic);
694 so->so_options |= SO_DONTROUTE;
695 if (flags & MSG_OOB) {
696 pru_flags = PRUS_OOB;
697 } else if ((flags & MSG_EOF) &&
698 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
701 * If the user set MSG_EOF, the protocol
702 * understands this flag and nothing left to
703 * send then use PRU_SEND_EOF instead of PRU_SEND.
705 pru_flags = PRUS_EOF;
706 } else if (resid > 0 && space > 0) {
707 /* If there is more to send, set PRUS_MORETOCOME */
708 pru_flags = PRUS_MORETOCOME;
713 * XXX all the SS_CANTSENDMORE checks previously
714 * done could be out of date. We could have recieved
715 * a reset packet in an interrupt or maybe we slept
716 * while doing page faults in uiomove() etc. We could
717 * probably recheck again inside the splnet() protection
718 * here, but there are probably other places that this
719 * also happens. We must rethink this.
721 error = so_pru_send(so, pru_flags, top, addr, control, td);
723 so->so_options &= ~SO_DONTROUTE;
730 } while (resid && space > 0);
734 ssb_unlock(&so->so_snd);
744 * A specialization of sosend() for UDP based on protocol-specific knowledge:
745 * so->so_proto->pr_flags has the PR_ATOMIC field set. This means that
746 * sosendallatonce() returns true,
747 * the "atomic" variable is true,
748 * and sosendudp() blocks until space is available for the entire send.
749 * so->so_proto->pr_flags does not have the PR_CONNREQUIRED or
750 * PR_IMPLOPCL flags set.
751 * UDP has no out-of-band data.
752 * UDP has no control data.
753 * UDP does not support MSG_EOR.
756 sosendudp(struct socket *so, struct sockaddr *addr, struct uio *uio,
757 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
759 boolean_t dontroute; /* temporary SO_DONTROUTE setting */
764 if (td->td_lwp != NULL)
765 td->td_lwp->lwp_ru.ru_msgsnd++;
769 KASSERT((uio && !top) || (top && !uio), ("bad arguments to sosendudp"));
770 resid = uio ? uio->uio_resid : (size_t)top->m_pkthdr.len;
773 error = ssb_lock(&so->so_snd, SBLOCKWAIT(flags));
777 if (so->so_state & SS_CANTSENDMORE)
780 error = so->so_error;
784 if (!(so->so_state & SS_ISCONNECTED) && addr == NULL)
785 gotoerr(EDESTADDRREQ);
786 if (resid > so->so_snd.ssb_hiwat)
788 space = ssb_space(&so->so_snd);
789 if (uio && (space < 0 || (size_t)space < resid)) {
790 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT))
791 gotoerr(EWOULDBLOCK);
792 ssb_unlock(&so->so_snd);
793 error = ssb_wait(&so->so_snd);
800 top = m_uiomove(uio);
805 dontroute = (flags & MSG_DONTROUTE) && !(so->so_options & SO_DONTROUTE);
807 so->so_options |= SO_DONTROUTE;
809 error = so_pru_send(so, 0, top, addr, NULL, td);
810 top = NULL; /* sent or freed in lower layer */
813 so->so_options &= ~SO_DONTROUTE;
816 ssb_unlock(&so->so_snd);
824 * Implement receive operations on a socket.
826 * We depend on the way that records are added to the signalsockbuf
827 * by sbappend*. In particular, each record (mbufs linked through m_next)
828 * must begin with an address if the protocol so specifies,
829 * followed by an optional mbuf or mbufs containing ancillary data,
830 * and then zero or more mbufs of data.
832 * Although the signalsockbuf is locked, new data may still be appended.
833 * A token inside the ssb_lock deals with MP issues and still allows
834 * the network to access the socket if we block in a uio.
836 * The caller may receive the data as a single mbuf chain by supplying
837 * an mbuf **mp0 for use in returning the chain. The uio is then used
838 * only for the count in uio_resid.
841 soreceive(struct socket *so, struct sockaddr **psa, struct uio *uio,
842 struct sockbuf *sio, struct mbuf **controlp, int *flagsp)
845 struct mbuf *free_chain = NULL;
846 int flags, len, error, offset;
847 struct protosw *pr = so->so_proto;
849 size_t resid, orig_resid;
852 resid = uio->uio_resid;
854 resid = (size_t)(sio->sb_climit - sio->sb_cc);
862 flags = *flagsp &~ MSG_EOR;
865 if (flags & MSG_OOB) {
866 m = m_get(MB_WAIT, MT_DATA);
869 error = so_pru_rcvoob(so, m, flags & MSG_PEEK);
875 KKASSERT(resid >= (size_t)m->m_len);
876 resid -= (size_t)m->m_len;
877 } while (resid > 0 && m);
880 uio->uio_resid = resid;
881 error = uiomove(mtod(m, caddr_t),
882 (int)szmin(resid, m->m_len),
884 resid = uio->uio_resid;
886 } while (uio->uio_resid && error == 0 && m);
893 if ((so->so_state & SS_ISCONFIRMING) && resid)
897 * The token interlocks against the protocol thread while
898 * ssb_lock is a blocking lock against other userland entities.
900 lwkt_gettoken(&so->so_rcv.ssb_token);
902 error = ssb_lock(&so->so_rcv, SBLOCKWAIT(flags));
906 m = so->so_rcv.ssb_mb;
908 * If we have less data than requested, block awaiting more
909 * (subject to any timeout) if:
910 * 1. the current count is less than the low water mark, or
911 * 2. MSG_WAITALL is set, and it is possible to do the entire
912 * receive operation at once if we block (resid <= hiwat).
913 * 3. MSG_DONTWAIT is not set
914 * If MSG_WAITALL is set but resid is larger than the receive buffer,
915 * we have to do the receive in sections, and thus risk returning
916 * a short count if a timeout or signal occurs after we start.
918 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
919 (size_t)so->so_rcv.ssb_cc < resid) &&
920 (so->so_rcv.ssb_cc < so->so_rcv.ssb_lowat ||
921 ((flags & MSG_WAITALL) && resid <= (size_t)so->so_rcv.ssb_hiwat)) &&
922 m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) {
923 KASSERT(m != NULL || !so->so_rcv.ssb_cc, ("receive 1"));
927 error = so->so_error;
928 if ((flags & MSG_PEEK) == 0)
932 if (so->so_state & SS_CANTRCVMORE) {
938 for (; m; m = m->m_next) {
939 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
940 m = so->so_rcv.ssb_mb;
944 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
945 (pr->pr_flags & PR_CONNREQUIRED)) {
951 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT)) {
955 ssb_unlock(&so->so_rcv);
956 error = ssb_wait(&so->so_rcv);
962 if (uio && uio->uio_td && uio->uio_td->td_proc)
963 uio->uio_td->td_lwp->lwp_ru.ru_msgrcv++;
966 * note: m should be == sb_mb here. Cache the next record while
967 * cleaning up. Note that calling m_free*() will break out critical
970 KKASSERT(m == so->so_rcv.ssb_mb);
973 * Skip any address mbufs prepending the record.
975 if (pr->pr_flags & PR_ADDR) {
976 KASSERT(m->m_type == MT_SONAME, ("receive 1a"));
979 *psa = dup_sockaddr(mtod(m, struct sockaddr *));
980 if (flags & MSG_PEEK)
983 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain);
987 * Skip any control mbufs prepending the record.
990 if (pr->pr_flags & PR_ADDR_OPT) {
992 * For SCTP we may be getting a
993 * whole message OR a partial delivery.
995 if (m && m->m_type == MT_SONAME) {
998 *psa = dup_sockaddr(mtod(m, struct sockaddr *));
999 if (flags & MSG_PEEK)
1002 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain);
1006 while (m && m->m_type == MT_CONTROL && error == 0) {
1007 if (flags & MSG_PEEK) {
1009 *controlp = m_copy(m, 0, m->m_len);
1010 m = m->m_next; /* XXX race */
1013 n = sbunlinkmbuf(&so->so_rcv.sb, m, NULL);
1014 if (pr->pr_domain->dom_externalize &&
1015 mtod(m, struct cmsghdr *)->cmsg_type ==
1017 error = (*pr->pr_domain->dom_externalize)(m);
1021 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain);
1024 if (controlp && *controlp) {
1026 controlp = &(*controlp)->m_next;
1035 if (type == MT_OOBDATA)
1040 * Copy to the UIO or mbuf return chain (*mp).
1044 while (m && resid > 0 && error == 0) {
1045 if (m->m_type == MT_OOBDATA) {
1046 if (type != MT_OOBDATA)
1048 } else if (type == MT_OOBDATA)
1051 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER,
1053 soclrstate(so, SS_RCVATMARK);
1054 len = (resid > INT_MAX) ? INT_MAX : resid;
1055 if (so->so_oobmark && len > so->so_oobmark - offset)
1056 len = so->so_oobmark - offset;
1057 if (len > m->m_len - moff)
1058 len = m->m_len - moff;
1061 * Copy out to the UIO or pass the mbufs back to the SIO.
1062 * The SIO is dealt with when we eat the mbuf, but deal
1063 * with the resid here either way.
1066 uio->uio_resid = resid;
1067 error = uiomove(mtod(m, caddr_t) + moff, len, uio);
1068 resid = uio->uio_resid;
1072 resid -= (size_t)len;
1076 * Eat the entire mbuf or just a piece of it
1078 if (len == m->m_len - moff) {
1079 if (m->m_flags & M_EOR)
1082 if (m->m_flags & M_NOTIFICATION)
1083 flags |= MSG_NOTIFICATION;
1085 if (flags & MSG_PEEK) {
1090 n = sbunlinkmbuf(&so->so_rcv.sb, m, NULL);
1094 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain);
1098 if (flags & MSG_PEEK) {
1102 n = m_copym(m, 0, len, MB_WAIT);
1108 so->so_rcv.ssb_cc -= len;
1111 if (so->so_oobmark) {
1112 if ((flags & MSG_PEEK) == 0) {
1113 so->so_oobmark -= len;
1114 if (so->so_oobmark == 0) {
1115 sosetstate(so, SS_RCVATMARK);
1120 if (offset == so->so_oobmark)
1124 if (flags & MSG_EOR)
1127 * If the MSG_WAITALL flag is set (for non-atomic socket),
1128 * we must not quit until resid == 0 or an error
1129 * termination. If a signal/timeout occurs, return
1130 * with a short count but without error.
1131 * Keep signalsockbuf locked against other readers.
1133 while ((flags & MSG_WAITALL) && m == NULL &&
1134 resid > 0 && !sosendallatonce(so) &&
1135 so->so_rcv.ssb_mb == NULL) {
1136 if (so->so_error || so->so_state & SS_CANTRCVMORE)
1139 * The window might have closed to zero, make
1140 * sure we send an ack now that we've drained
1141 * the buffer or we might end up blocking until
1142 * the idle takes over (5 seconds).
1144 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1145 so_pru_rcvd(so, flags);
1146 error = ssb_wait(&so->so_rcv);
1148 ssb_unlock(&so->so_rcv);
1152 m = so->so_rcv.ssb_mb;
1157 * If an atomic read was requested but unread data still remains
1158 * in the record, set MSG_TRUNC.
1160 if (m && pr->pr_flags & PR_ATOMIC)
1164 * Cleanup. If an atomic read was requested drop any unread data.
1166 if ((flags & MSG_PEEK) == 0) {
1167 if (m && (pr->pr_flags & PR_ATOMIC))
1168 sbdroprecord(&so->so_rcv.sb);
1169 if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1170 so_pru_rcvd(so, flags);
1173 if (orig_resid == resid && orig_resid &&
1174 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1175 ssb_unlock(&so->so_rcv);
1182 ssb_unlock(&so->so_rcv);
1184 lwkt_reltoken(&so->so_rcv.ssb_token);
1186 m_freem(free_chain);
1191 * Shut a socket down. Note that we do not get a frontend lock as we
1192 * want to be able to shut the socket down even if another thread is
1193 * blocked in a read(), thus waking it up.
1196 soshutdown(struct socket *so, int how)
1198 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1201 if (how != SHUT_WR) {
1202 /*ssb_lock(&so->so_rcv, M_WAITOK);*/
1204 /*ssb_unlock(&so->so_rcv);*/
1207 return (so_pru_shutdown(so));
1212 sorflush(struct socket *so)
1214 struct signalsockbuf *ssb = &so->so_rcv;
1215 struct protosw *pr = so->so_proto;
1216 struct signalsockbuf asb;
1218 atomic_set_int(&ssb->ssb_flags, SSB_NOINTR);
1220 lwkt_gettoken(&ssb->ssb_token);
1225 * Can't just blow up the ssb structure here
1227 bzero(&ssb->sb, sizeof(ssb->sb));
1232 atomic_clear_int(&ssb->ssb_flags, SSB_CLEAR_MASK);
1234 if ((pr->pr_flags & PR_RIGHTS) && pr->pr_domain->dom_dispose)
1235 (*pr->pr_domain->dom_dispose)(asb.ssb_mb);
1236 ssb_release(&asb, so);
1238 lwkt_reltoken(&ssb->ssb_token);
1243 do_setopt_accept_filter(struct socket *so, struct sockopt *sopt)
1245 struct accept_filter_arg *afap = NULL;
1246 struct accept_filter *afp;
1247 struct so_accf *af = so->so_accf;
1250 /* do not set/remove accept filters on non listen sockets */
1251 if ((so->so_options & SO_ACCEPTCONN) == 0) {
1256 /* removing the filter */
1259 if (af->so_accept_filter != NULL &&
1260 af->so_accept_filter->accf_destroy != NULL) {
1261 af->so_accept_filter->accf_destroy(so);
1263 if (af->so_accept_filter_str != NULL) {
1264 FREE(af->so_accept_filter_str, M_ACCF);
1269 so->so_options &= ~SO_ACCEPTFILTER;
1272 /* adding a filter */
1273 /* must remove previous filter first */
1278 /* don't put large objects on the kernel stack */
1279 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), M_TEMP, M_WAITOK);
1280 error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap);
1281 afap->af_name[sizeof(afap->af_name)-1] = '\0';
1282 afap->af_arg[sizeof(afap->af_arg)-1] = '\0';
1285 afp = accept_filt_get(afap->af_name);
1290 MALLOC(af, struct so_accf *, sizeof(*af), M_ACCF, M_WAITOK | M_ZERO);
1291 if (afp->accf_create != NULL) {
1292 if (afap->af_name[0] != '\0') {
1293 int len = strlen(afap->af_name) + 1;
1295 MALLOC(af->so_accept_filter_str, char *, len, M_ACCF, M_WAITOK);
1296 strcpy(af->so_accept_filter_str, afap->af_name);
1298 af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg);
1299 if (af->so_accept_filter_arg == NULL) {
1300 FREE(af->so_accept_filter_str, M_ACCF);
1307 af->so_accept_filter = afp;
1309 so->so_options |= SO_ACCEPTFILTER;
1318 * Perhaps this routine, and sooptcopyout(), below, ought to come in
1319 * an additional variant to handle the case where the option value needs
1320 * to be some kind of integer, but not a specific size.
1321 * In addition to their use here, these functions are also called by the
1322 * protocol-level pr_ctloutput() routines.
1325 sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
1327 return soopt_to_kbuf(sopt, buf, len, minlen);
1331 soopt_to_kbuf(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
1335 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val));
1336 KKASSERT(kva_p(buf));
1339 * If the user gives us more than we wanted, we ignore it,
1340 * but if we don't get the minimum length the caller
1341 * wants, we return EINVAL. On success, sopt->sopt_valsize
1342 * is set to however much we actually retrieved.
1344 if ((valsize = sopt->sopt_valsize) < minlen)
1347 sopt->sopt_valsize = valsize = len;
1349 bcopy(sopt->sopt_val, buf, valsize);
1355 sosetopt(struct socket *so, struct sockopt *sopt)
1361 struct signalsockbuf *sotmp;
1364 sopt->sopt_dir = SOPT_SET;
1365 if (sopt->sopt_level != SOL_SOCKET) {
1366 if (so->so_proto && so->so_proto->pr_ctloutput) {
1367 return (so_pr_ctloutput(so, sopt));
1369 error = ENOPROTOOPT;
1371 switch (sopt->sopt_name) {
1373 case SO_ACCEPTFILTER:
1374 error = do_setopt_accept_filter(so, sopt);
1380 error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
1384 so->so_linger = l.l_linger;
1386 so->so_options |= SO_LINGER;
1388 so->so_options &= ~SO_LINGER;
1394 case SO_USELOOPBACK:
1400 error = sooptcopyin(sopt, &optval, sizeof optval,
1405 so->so_options |= sopt->sopt_name;
1407 so->so_options &= ~sopt->sopt_name;
1414 error = sooptcopyin(sopt, &optval, sizeof optval,
1420 * Values < 1 make no sense for any of these
1421 * options, so disallow them.
1428 switch (sopt->sopt_name) {
1431 if (ssb_reserve(sopt->sopt_name == SO_SNDBUF ?
1432 &so->so_snd : &so->so_rcv, (u_long)optval,
1434 &curproc->p_rlimit[RLIMIT_SBSIZE]) == 0) {
1438 sotmp = (sopt->sopt_name == SO_SNDBUF) ?
1439 &so->so_snd : &so->so_rcv;
1440 atomic_clear_int(&sotmp->ssb_flags,
1445 * Make sure the low-water is never greater than
1449 so->so_snd.ssb_lowat =
1450 (optval > so->so_snd.ssb_hiwat) ?
1451 so->so_snd.ssb_hiwat : optval;
1452 atomic_clear_int(&so->so_snd.ssb_flags,
1456 so->so_rcv.ssb_lowat =
1457 (optval > so->so_rcv.ssb_hiwat) ?
1458 so->so_rcv.ssb_hiwat : optval;
1459 atomic_clear_int(&so->so_rcv.ssb_flags,
1467 error = sooptcopyin(sopt, &tv, sizeof tv,
1472 /* assert(hz > 0); */
1473 if (tv.tv_sec < 0 || tv.tv_sec > INT_MAX / hz ||
1474 tv.tv_usec < 0 || tv.tv_usec >= 1000000) {
1478 /* assert(tick > 0); */
1479 /* assert(ULONG_MAX - INT_MAX >= 1000000); */
1480 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / ustick;
1481 if (val > INT_MAX) {
1485 if (val == 0 && tv.tv_usec != 0)
1488 switch (sopt->sopt_name) {
1490 so->so_snd.ssb_timeo = val;
1493 so->so_rcv.ssb_timeo = val;
1498 error = ENOPROTOOPT;
1501 if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
1502 (void) so_pr_ctloutput(so, sopt);
1509 /* Helper routine for getsockopt */
1511 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
1513 soopt_from_kbuf(sopt, buf, len);
1518 soopt_from_kbuf(struct sockopt *sopt, const void *buf, size_t len)
1523 sopt->sopt_valsize = 0;
1527 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val));
1528 KKASSERT(kva_p(buf));
1531 * Documented get behavior is that we always return a value,
1532 * possibly truncated to fit in the user's buffer.
1533 * Traditional behavior is that we always tell the user
1534 * precisely how much we copied, rather than something useful
1535 * like the total amount we had available for her.
1536 * Note that this interface is not idempotent; the entire answer must
1537 * generated ahead of time.
1539 valsize = szmin(len, sopt->sopt_valsize);
1540 sopt->sopt_valsize = valsize;
1541 if (sopt->sopt_val != 0) {
1542 bcopy(buf, sopt->sopt_val, valsize);
1547 sogetopt(struct socket *so, struct sockopt *sopt)
1554 struct accept_filter_arg *afap;
1558 sopt->sopt_dir = SOPT_GET;
1559 if (sopt->sopt_level != SOL_SOCKET) {
1560 if (so->so_proto && so->so_proto->pr_ctloutput) {
1561 return (so_pr_ctloutput(so, sopt));
1563 return (ENOPROTOOPT);
1565 switch (sopt->sopt_name) {
1567 case SO_ACCEPTFILTER:
1568 if ((so->so_options & SO_ACCEPTCONN) == 0)
1570 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap),
1571 M_TEMP, M_WAITOK | M_ZERO);
1572 if ((so->so_options & SO_ACCEPTFILTER) != 0) {
1573 strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name);
1574 if (so->so_accf->so_accept_filter_str != NULL)
1575 strcpy(afap->af_arg, so->so_accf->so_accept_filter_str);
1577 error = sooptcopyout(sopt, afap, sizeof(*afap));
1583 l.l_onoff = so->so_options & SO_LINGER;
1584 l.l_linger = so->so_linger;
1585 error = sooptcopyout(sopt, &l, sizeof l);
1588 case SO_USELOOPBACK:
1597 optval = so->so_options & sopt->sopt_name;
1599 error = sooptcopyout(sopt, &optval, sizeof optval);
1603 optval = so->so_type;
1607 optval = so->so_error;
1612 optval = so->so_snd.ssb_hiwat;
1616 optval = so->so_rcv.ssb_hiwat;
1620 optval = so->so_snd.ssb_lowat;
1624 optval = so->so_rcv.ssb_lowat;
1629 optval = (sopt->sopt_name == SO_SNDTIMEO ?
1630 so->so_snd.ssb_timeo : so->so_rcv.ssb_timeo);
1632 tv.tv_sec = optval / hz;
1633 tv.tv_usec = (optval % hz) * ustick;
1634 error = sooptcopyout(sopt, &tv, sizeof tv);
1638 optval_l = ssb_space(&so->so_snd);
1639 error = sooptcopyout(sopt, &optval_l, sizeof(optval_l));
1643 error = ENOPROTOOPT;
1650 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
1652 soopt_getm(struct sockopt *sopt, struct mbuf **mp)
1654 struct mbuf *m, *m_prev;
1655 int sopt_size = sopt->sopt_valsize, msize;
1657 m = m_getl(sopt_size, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_DATA,
1661 m->m_len = min(msize, sopt_size);
1662 sopt_size -= m->m_len;
1666 while (sopt_size > 0) {
1667 m = m_getl(sopt_size, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT,
1668 MT_DATA, 0, &msize);
1673 m->m_len = min(msize, sopt_size);
1674 sopt_size -= m->m_len;
1681 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */
1683 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
1685 soopt_to_mbuf(sopt, m);
1690 soopt_to_mbuf(struct sockopt *sopt, struct mbuf *m)
1695 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val));
1697 if (sopt->sopt_val == NULL)
1699 val = sopt->sopt_val;
1700 valsize = sopt->sopt_valsize;
1701 while (m != NULL && valsize >= m->m_len) {
1702 bcopy(val, mtod(m, char *), m->m_len);
1703 valsize -= m->m_len;
1704 val = (caddr_t)val + m->m_len;
1707 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
1708 panic("ip6_sooptmcopyin");
1711 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */
1713 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
1715 return soopt_from_mbuf(sopt, m);
1719 soopt_from_mbuf(struct sockopt *sopt, struct mbuf *m)
1721 struct mbuf *m0 = m;
1726 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val));
1728 if (sopt->sopt_val == NULL)
1730 val = sopt->sopt_val;
1731 maxsize = sopt->sopt_valsize;
1732 while (m != NULL && maxsize >= m->m_len) {
1733 bcopy(mtod(m, char *), val, m->m_len);
1734 maxsize -= m->m_len;
1735 val = (caddr_t)val + m->m_len;
1736 valsize += m->m_len;
1740 /* enough soopt buffer should be given from user-land */
1744 sopt->sopt_valsize = valsize;
1749 sohasoutofband(struct socket *so)
1751 if (so->so_sigio != NULL)
1752 pgsigio(so->so_sigio, SIGURG, 0);
1753 KNOTE(&so->so_rcv.ssb_kq.ki_note, NOTE_OOB);
1757 sokqfilter(struct file *fp, struct knote *kn)
1759 struct socket *so = (struct socket *)kn->kn_fp->f_data;
1760 struct signalsockbuf *ssb;
1762 switch (kn->kn_filter) {
1764 if (so->so_options & SO_ACCEPTCONN)
1765 kn->kn_fop = &solisten_filtops;
1767 kn->kn_fop = &soread_filtops;
1771 kn->kn_fop = &sowrite_filtops;
1775 kn->kn_fop = &soexcept_filtops;
1779 return (EOPNOTSUPP);
1782 knote_insert(&ssb->ssb_kq.ki_note, kn);
1783 atomic_set_int(&ssb->ssb_flags, SSB_KNOTE);
1788 filt_sordetach(struct knote *kn)
1790 struct socket *so = (struct socket *)kn->kn_fp->f_data;
1792 knote_remove(&so->so_rcv.ssb_kq.ki_note, kn);
1793 if (SLIST_EMPTY(&so->so_rcv.ssb_kq.ki_note))
1794 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_KNOTE);
1799 filt_soread(struct knote *kn, long hint)
1801 struct socket *so = (struct socket *)kn->kn_fp->f_data;
1803 if (kn->kn_sfflags & NOTE_OOB) {
1804 if ((so->so_oobmark || (so->so_state & SS_RCVATMARK))) {
1805 kn->kn_fflags |= NOTE_OOB;
1810 kn->kn_data = so->so_rcv.ssb_cc;
1812 if (so->so_state & SS_CANTRCVMORE) {
1814 * Only set NODATA if all data has been exhausted.
1816 if (kn->kn_data == 0)
1817 kn->kn_flags |= EV_NODATA;
1818 kn->kn_flags |= EV_EOF;
1819 kn->kn_fflags = so->so_error;
1822 if (so->so_error) /* temporary udp error */
1824 if (kn->kn_sfflags & NOTE_LOWAT)
1825 return (kn->kn_data >= kn->kn_sdata);
1826 return ((kn->kn_data >= so->so_rcv.ssb_lowat) ||
1827 !TAILQ_EMPTY(&so->so_comp));
1831 filt_sowdetach(struct knote *kn)
1833 struct socket *so = (struct socket *)kn->kn_fp->f_data;
1835 knote_remove(&so->so_snd.ssb_kq.ki_note, kn);
1836 if (SLIST_EMPTY(&so->so_snd.ssb_kq.ki_note))
1837 atomic_clear_int(&so->so_snd.ssb_flags, SSB_KNOTE);
1842 filt_sowrite(struct knote *kn, long hint)
1844 struct socket *so = (struct socket *)kn->kn_fp->f_data;
1846 kn->kn_data = ssb_space(&so->so_snd);
1847 if (so->so_state & SS_CANTSENDMORE) {
1848 kn->kn_flags |= (EV_EOF | EV_NODATA);
1849 kn->kn_fflags = so->so_error;
1852 if (so->so_error) /* temporary udp error */
1854 if (((so->so_state & SS_ISCONNECTED) == 0) &&
1855 (so->so_proto->pr_flags & PR_CONNREQUIRED))
1857 if (kn->kn_sfflags & NOTE_LOWAT)
1858 return (kn->kn_data >= kn->kn_sdata);
1859 return (kn->kn_data >= so->so_snd.ssb_lowat);
1864 filt_solisten(struct knote *kn, long hint)
1866 struct socket *so = (struct socket *)kn->kn_fp->f_data;
1868 kn->kn_data = so->so_qlen;
1869 return (! TAILQ_EMPTY(&so->so_comp));