2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2004 The FreeBSD Foundation
5 * Copyright (c) 2004-2008 Robert N. M. Watson
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 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
36 * Comments on the socket life cycle:
38 * soalloc() sets of socket layer state for a socket, called only by
39 * socreate() and sonewconn(). Socket layer private.
41 * sodealloc() tears down socket layer state for a socket, called only by
42 * sofree() and sonewconn(). Socket layer private.
44 * pru_attach() associates protocol layer state with an allocated socket;
45 * called only once, may fail, aborting socket allocation. This is called
46 * from socreate() and sonewconn(). Socket layer private.
48 * pru_detach() disassociates protocol layer state from an attached socket,
49 * and will be called exactly once for sockets in which pru_attach() has
50 * been successfully called. If pru_attach() returned an error,
51 * pru_detach() will not be called. Socket layer private.
53 * pru_abort() and pru_close() notify the protocol layer that the last
54 * consumer of a socket is starting to tear down the socket, and that the
55 * protocol should terminate the connection. Historically, pru_abort() also
56 * detached protocol state from the socket state, but this is no longer the
59 * socreate() creates a socket and attaches protocol state. This is a public
60 * interface that may be used by socket layer consumers to create new
63 * sonewconn() creates a socket and attaches protocol state. This is a
64 * public interface that may be used by protocols to create new sockets when
65 * a new connection is received and will be available for accept() on a
68 * soclose() destroys a socket after possibly waiting for it to disconnect.
69 * This is a public interface that socket consumers should use to close and
70 * release a socket when done with it.
72 * soabort() destroys a socket without waiting for it to disconnect (used
73 * only for incoming connections that are already partially or fully
74 * connected). This is used internally by the socket layer when clearing
75 * listen socket queues (due to overflow or close on the listen socket), but
76 * is also a public interface protocols may use to abort connections in
77 * their incomplete listen queues should they no longer be required. Sockets
78 * placed in completed connection listen queues should not be aborted for
79 * reasons described in the comment above the soclose() implementation. This
80 * is not a general purpose close routine, and except in the specific
81 * circumstances described here, should not be used.
83 * sofree() will free a socket and its protocol state if all references on
84 * the socket have been released, and is the public interface to attempt to
85 * free a socket when a reference is removed. This is a socket layer private
88 * NOTE: In addition to socreate() and soclose(), which provide a single
89 * socket reference to the consumer to be managed as required, there are two
90 * calls to explicitly manage socket references, soref(), and sorele().
91 * Currently, these are generally required only when transitioning a socket
92 * from a listen queue to a file descriptor, in order to prevent garbage
93 * collection of the socket at an untimely moment. For a number of reasons,
94 * these interfaces are not preferred, and should be avoided.
96 * NOTE: With regard to VNETs the general rule is that callers do not set
97 * curvnet. Exceptions to this rule include soabort(), sodisconnect(),
98 * sofree() (and with that sorele(), sotryfree()), as well as sonewconn()
99 * and sorflush(), which are usually called from a pre-set VNET context.
100 * sopoll() currently does not need a VNET context to be set.
103 #include <sys/cdefs.h>
104 __FBSDID("$FreeBSD$");
106 #include "opt_inet.h"
107 #include "opt_inet6.h"
108 #include "opt_compat.h"
110 #include <sys/param.h>
111 #include <sys/systm.h>
112 #include <sys/fcntl.h>
113 #include <sys/limits.h>
114 #include <sys/lock.h>
116 #include <sys/malloc.h>
117 #include <sys/mbuf.h>
118 #include <sys/mutex.h>
119 #include <sys/domain.h>
120 #include <sys/file.h> /* for struct knote */
121 #include <sys/kernel.h>
122 #include <sys/event.h>
123 #include <sys/eventhandler.h>
124 #include <sys/poll.h>
125 #include <sys/proc.h>
126 #include <sys/protosw.h>
127 #include <sys/socket.h>
128 #include <sys/socketvar.h>
129 #include <sys/resourcevar.h>
130 #include <net/route.h>
131 #include <sys/signalvar.h>
132 #include <sys/stat.h>
134 #include <sys/sysctl.h>
136 #include <sys/jail.h>
137 #include <sys/syslog.h>
138 #include <netinet/in.h>
140 #include <net/vnet.h>
142 #include <security/mac/mac_framework.h>
146 #ifdef COMPAT_FREEBSD32
147 #include <sys/mount.h>
148 #include <sys/sysent.h>
149 #include <compat/freebsd32/freebsd32.h>
152 static int soreceive_rcvoob(struct socket *so, struct uio *uio,
155 static void filt_sordetach(struct knote *kn);
156 static int filt_soread(struct knote *kn, long hint);
157 static void filt_sowdetach(struct knote *kn);
158 static int filt_sowrite(struct knote *kn, long hint);
159 static int filt_solisten(struct knote *kn, long hint);
161 static struct filterops solisten_filtops = {
163 .f_detach = filt_sordetach,
164 .f_event = filt_solisten,
166 static struct filterops soread_filtops = {
168 .f_detach = filt_sordetach,
169 .f_event = filt_soread,
171 static struct filterops sowrite_filtops = {
173 .f_detach = filt_sowdetach,
174 .f_event = filt_sowrite,
177 so_gen_t so_gencnt; /* generation count for sockets */
179 MALLOC_DEFINE(M_SONAME, "soname", "socket name");
180 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
182 #define VNET_SO_ASSERT(so) \
183 VNET_ASSERT(curvnet != NULL, \
184 ("%s:%d curvnet is NULL, so=%p", __func__, __LINE__, (so)));
187 * Limit on the number of connections in the listen queue waiting
189 * NB: The orginal sysctl somaxconn is still available but hidden
190 * to prevent confusion about the actual purpose of this number.
192 static int somaxconn = SOMAXCONN;
195 sysctl_somaxconn(SYSCTL_HANDLER_ARGS)
201 error = sysctl_handle_int(oidp, &val, 0, req);
202 if (error || !req->newptr )
205 if (val < 1 || val > USHRT_MAX)
211 SYSCTL_PROC(_kern_ipc, OID_AUTO, soacceptqueue, CTLTYPE_UINT | CTLFLAG_RW,
212 0, sizeof(int), sysctl_somaxconn, "I",
213 "Maximum listen socket pending connection accept queue size");
214 SYSCTL_PROC(_kern_ipc, KIPC_SOMAXCONN, somaxconn,
215 CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_SKIP,
216 0, sizeof(int), sysctl_somaxconn, "I",
217 "Maximum listen socket pending connection accept queue size (compat)");
219 static int numopensockets;
220 SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD,
221 &numopensockets, 0, "Number of open sockets");
224 * accept_mtx locks down per-socket fields relating to accept queues. See
225 * socketvar.h for an annotation of the protected fields of struct socket.
227 struct mtx accept_mtx;
228 MTX_SYSINIT(accept_mtx, &accept_mtx, "accept", MTX_DEF);
231 * so_global_mtx protects so_gencnt, numopensockets, and the per-socket
234 static struct mtx so_global_mtx;
235 MTX_SYSINIT(so_global_mtx, &so_global_mtx, "so_glabel", MTX_DEF);
238 * General IPC sysctl name space, used by sockets and a variety of other IPC
241 SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW, 0, "IPC");
244 * Initialize the socket subsystem and set up the socket
247 static uma_zone_t socket_zone;
251 socket_zone_change(void *tag)
254 maxsockets = uma_zone_set_max(socket_zone, maxsockets);
258 socket_init(void *tag)
261 socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL,
262 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
263 maxsockets = uma_zone_set_max(socket_zone, maxsockets);
264 uma_zone_set_warning(socket_zone, "kern.ipc.maxsockets limit reached");
265 EVENTHANDLER_REGISTER(maxsockets_change, socket_zone_change, NULL,
266 EVENTHANDLER_PRI_FIRST);
268 SYSINIT(socket, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, socket_init, NULL);
271 * Initialise maxsockets. This SYSINIT must be run after
275 init_maxsockets(void *ignored)
278 TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
279 maxsockets = imax(maxsockets, maxfiles);
281 SYSINIT(param, SI_SUB_TUNABLES, SI_ORDER_ANY, init_maxsockets, NULL);
284 * Sysctl to get and set the maximum global sockets limit. Notify protocols
285 * of the change so that they can update their dependent limits as required.
288 sysctl_maxsockets(SYSCTL_HANDLER_ARGS)
290 int error, newmaxsockets;
292 newmaxsockets = maxsockets;
293 error = sysctl_handle_int(oidp, &newmaxsockets, 0, req);
294 if (error == 0 && req->newptr) {
295 if (newmaxsockets > maxsockets &&
296 newmaxsockets <= maxfiles) {
297 maxsockets = newmaxsockets;
298 EVENTHANDLER_INVOKE(maxsockets_change);
304 SYSCTL_PROC(_kern_ipc, OID_AUTO, maxsockets, CTLTYPE_INT|CTLFLAG_RW,
305 &maxsockets, 0, sysctl_maxsockets, "IU",
306 "Maximum number of sockets avaliable");
309 * Socket operation routines. These routines are called by the routines in
310 * sys_socket.c or from a system process, and implement the semantics of
311 * socket operations by switching out to the protocol specific routines.
315 * Get a socket structure from our zone, and initialize it. Note that it
316 * would probably be better to allocate socket and PCB at the same time, but
317 * I'm not convinced that all the protocols can be easily modified to do
320 * soalloc() returns a socket with a ref count of 0.
322 static struct socket *
323 soalloc(struct vnet *vnet)
327 so = uma_zalloc(socket_zone, M_NOWAIT | M_ZERO);
331 if (mac_socket_init(so, M_NOWAIT) != 0) {
332 uma_zfree(socket_zone, so);
336 SOCKBUF_LOCK_INIT(&so->so_snd, "so_snd");
337 SOCKBUF_LOCK_INIT(&so->so_rcv, "so_rcv");
338 sx_init(&so->so_snd.sb_sx, "so_snd_sx");
339 sx_init(&so->so_rcv.sb_sx, "so_rcv_sx");
340 TAILQ_INIT(&so->so_aiojobq);
341 mtx_lock(&so_global_mtx);
342 so->so_gencnt = ++so_gencnt;
345 VNET_ASSERT(vnet != NULL, ("%s:%d vnet is NULL, so=%p",
346 __func__, __LINE__, so));
347 vnet->vnet_sockcnt++;
350 mtx_unlock(&so_global_mtx);
355 * Free the storage associated with a socket at the socket layer, tear down
356 * locks, labels, etc. All protocol state is assumed already to have been
357 * torn down (and possibly never set up) by the caller.
360 sodealloc(struct socket *so)
363 KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count));
364 KASSERT(so->so_pcb == NULL, ("sodealloc(): so_pcb != NULL"));
366 mtx_lock(&so_global_mtx);
367 so->so_gencnt = ++so_gencnt;
368 --numopensockets; /* Could be below, but faster here. */
370 VNET_ASSERT(so->so_vnet != NULL, ("%s:%d so_vnet is NULL, so=%p",
371 __func__, __LINE__, so));
372 so->so_vnet->vnet_sockcnt--;
374 mtx_unlock(&so_global_mtx);
375 if (so->so_rcv.sb_hiwat)
376 (void)chgsbsize(so->so_cred->cr_uidinfo,
377 &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
378 if (so->so_snd.sb_hiwat)
379 (void)chgsbsize(so->so_cred->cr_uidinfo,
380 &so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
382 /* remove acccept filter if one is present. */
383 if (so->so_accf != NULL)
384 do_setopt_accept_filter(so, NULL);
387 mac_socket_destroy(so);
390 sx_destroy(&so->so_snd.sb_sx);
391 sx_destroy(&so->so_rcv.sb_sx);
392 SOCKBUF_LOCK_DESTROY(&so->so_snd);
393 SOCKBUF_LOCK_DESTROY(&so->so_rcv);
394 uma_zfree(socket_zone, so);
398 * socreate returns a socket with a ref count of 1. The socket should be
399 * closed with soclose().
402 socreate(int dom, struct socket **aso, int type, int proto,
403 struct ucred *cred, struct thread *td)
410 prp = pffindproto(dom, proto, type);
412 prp = pffindtype(dom, type);
415 /* No support for domain. */
416 if (pffinddomain(dom) == NULL)
417 return (EAFNOSUPPORT);
418 /* No support for socket type. */
419 if (proto == 0 && type != 0)
421 return (EPROTONOSUPPORT);
423 if (prp->pr_usrreqs->pru_attach == NULL ||
424 prp->pr_usrreqs->pru_attach == pru_attach_notsupp)
425 return (EPROTONOSUPPORT);
427 if (prison_check_af(cred, prp->pr_domain->dom_family) != 0)
428 return (EPROTONOSUPPORT);
430 if (prp->pr_type != type)
432 so = soalloc(CRED_TO_VNET(cred));
436 TAILQ_INIT(&so->so_incomp);
437 TAILQ_INIT(&so->so_comp);
439 so->so_cred = crhold(cred);
440 if ((prp->pr_domain->dom_family == PF_INET) ||
441 (prp->pr_domain->dom_family == PF_INET6) ||
442 (prp->pr_domain->dom_family == PF_ROUTE))
443 so->so_fibnum = td->td_proc->p_fibnum;
448 mac_socket_create(cred, so);
450 knlist_init_mtx(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv));
451 knlist_init_mtx(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd));
454 * Auto-sizing of socket buffers is managed by the protocols and
455 * the appropriate flags must be set in the pru_attach function.
457 CURVNET_SET(so->so_vnet);
458 error = (*prp->pr_usrreqs->pru_attach)(so, proto, td);
461 KASSERT(so->so_count == 1, ("socreate: so_count %d",
472 static int regression_sonewconn_earlytest = 1;
473 SYSCTL_INT(_regression, OID_AUTO, sonewconn_earlytest, CTLFLAG_RW,
474 ®ression_sonewconn_earlytest, 0, "Perform early sonewconn limit test");
478 * When an attempt at a new connection is noted on a socket which accepts
479 * connections, sonewconn is called. If the connection is possible (subject
480 * to space constraints, etc.) then we allocate a new structure, propoerly
481 * linked into the data structure of the original socket, and return this.
482 * Connstatus may be 0, or SO_ISCONFIRMING, or SO_ISCONNECTED.
484 * Note: the ref count on the socket is 0 on return.
487 sonewconn(struct socket *head, int connstatus)
493 over = (head->so_qlen > 3 * head->so_qlimit / 2);
496 if (regression_sonewconn_earlytest && over) {
500 log(LOG_DEBUG, "%s: pcb %p: Listen queue overflow: "
501 "%i already in queue awaiting acceptance\n",
502 __func__, head->so_pcb, head->so_qlen);
505 VNET_ASSERT(head->so_vnet != NULL, ("%s:%d so_vnet is NULL, head=%p",
506 __func__, __LINE__, head));
507 so = soalloc(head->so_vnet);
509 log(LOG_DEBUG, "%s: pcb %p: New socket allocation failure: "
510 "limit reached or out of memory\n",
511 __func__, head->so_pcb);
514 if ((head->so_options & SO_ACCEPTFILTER) != 0)
517 so->so_type = head->so_type;
518 so->so_options = head->so_options &~ SO_ACCEPTCONN;
519 so->so_linger = head->so_linger;
520 so->so_state = head->so_state | SS_NOFDREF;
521 so->so_fibnum = head->so_fibnum;
522 so->so_proto = head->so_proto;
523 so->so_cred = crhold(head->so_cred);
525 mac_socket_newconn(head, so);
527 knlist_init_mtx(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv));
528 knlist_init_mtx(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd));
529 VNET_SO_ASSERT(head);
530 if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat)) {
532 log(LOG_DEBUG, "%s: pcb %p: soreserve() failed\n",
533 __func__, head->so_pcb);
536 if ((*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
538 log(LOG_DEBUG, "%s: pcb %p: pru_attach() failed\n",
539 __func__, head->so_pcb);
542 so->so_rcv.sb_lowat = head->so_rcv.sb_lowat;
543 so->so_snd.sb_lowat = head->so_snd.sb_lowat;
544 so->so_rcv.sb_timeo = head->so_rcv.sb_timeo;
545 so->so_snd.sb_timeo = head->so_snd.sb_timeo;
546 so->so_rcv.sb_flags |= head->so_rcv.sb_flags & SB_AUTOSIZE;
547 so->so_snd.sb_flags |= head->so_snd.sb_flags & SB_AUTOSIZE;
548 so->so_state |= connstatus;
551 * The accept socket may be tearing down but we just
552 * won a race on the ACCEPT_LOCK.
553 * However, if sctp_peeloff() is called on a 1-to-many
554 * style socket, the SO_ACCEPTCONN doesn't need to be set.
556 if (!(head->so_options & SO_ACCEPTCONN) &&
557 ((head->so_proto->pr_protocol != IPPROTO_SCTP) ||
558 (head->so_type != SOCK_SEQPACKET))) {
561 sofree(so); /* NB: returns ACCEPT_UNLOCK'ed. */
565 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
566 so->so_qstate |= SQ_COMP;
570 * Keep removing sockets from the head until there's room for
571 * us to insert on the tail. In pre-locking revisions, this
572 * was a simple if(), but as we could be racing with other
573 * threads and soabort() requires dropping locks, we must
574 * loop waiting for the condition to be true.
576 while (head->so_incqlen > head->so_qlimit) {
578 sp = TAILQ_FIRST(&head->so_incomp);
579 TAILQ_REMOVE(&head->so_incomp, sp, so_list);
581 sp->so_qstate &= ~SQ_INCOMP;
587 TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
588 so->so_qstate |= SQ_INCOMP;
594 wakeup_one(&head->so_timeo);
600 sobind(struct socket *so, struct sockaddr *nam, struct thread *td)
604 CURVNET_SET(so->so_vnet);
605 error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td);
611 sobindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
615 CURVNET_SET(so->so_vnet);
616 error = (*so->so_proto->pr_usrreqs->pru_bindat)(fd, so, nam, td);
622 * solisten() transitions a socket from a non-listening state to a listening
623 * state, but can also be used to update the listen queue depth on an
624 * existing listen socket. The protocol will call back into the sockets
625 * layer using solisten_proto_check() and solisten_proto() to check and set
626 * socket-layer listen state. Call backs are used so that the protocol can
627 * acquire both protocol and socket layer locks in whatever order is required
630 * Protocol implementors are advised to hold the socket lock across the
631 * socket-layer test and set to avoid races at the socket layer.
634 solisten(struct socket *so, int backlog, struct thread *td)
638 CURVNET_SET(so->so_vnet);
639 error = (*so->so_proto->pr_usrreqs->pru_listen)(so, backlog, td);
645 solisten_proto_check(struct socket *so)
648 SOCK_LOCK_ASSERT(so);
650 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
657 solisten_proto(struct socket *so, int backlog)
660 SOCK_LOCK_ASSERT(so);
662 if (backlog < 0 || backlog > somaxconn)
664 so->so_qlimit = backlog;
665 so->so_options |= SO_ACCEPTCONN;
669 * Evaluate the reference count and named references on a socket; if no
670 * references remain, free it. This should be called whenever a reference is
671 * released, such as in sorele(), but also when named reference flags are
672 * cleared in socket or protocol code.
674 * sofree() will free the socket if:
676 * - There are no outstanding file descriptor references or related consumers
679 * - The socket has been closed by user space, if ever open (SS_NOFDREF).
681 * - The protocol does not have an outstanding strong reference on the socket
684 * - The socket is not in a completed connection queue, so a process has been
685 * notified that it is present. If it is removed, the user process may
686 * block in accept() despite select() saying the socket was ready.
689 sofree(struct socket *so)
691 struct protosw *pr = so->so_proto;
694 ACCEPT_LOCK_ASSERT();
695 SOCK_LOCK_ASSERT(so);
697 if ((so->so_state & SS_NOFDREF) == 0 || so->so_count != 0 ||
698 (so->so_state & SS_PROTOREF) || (so->so_qstate & SQ_COMP)) {
706 KASSERT((so->so_qstate & SQ_COMP) != 0 ||
707 (so->so_qstate & SQ_INCOMP) != 0,
708 ("sofree: so_head != NULL, but neither SQ_COMP nor "
710 KASSERT((so->so_qstate & SQ_COMP) == 0 ||
711 (so->so_qstate & SQ_INCOMP) == 0,
712 ("sofree: so->so_qstate is SQ_COMP and also SQ_INCOMP"));
713 TAILQ_REMOVE(&head->so_incomp, so, so_list);
715 so->so_qstate &= ~SQ_INCOMP;
718 KASSERT((so->so_qstate & SQ_COMP) == 0 &&
719 (so->so_qstate & SQ_INCOMP) == 0,
720 ("sofree: so_head == NULL, but still SQ_COMP(%d) or SQ_INCOMP(%d)",
721 so->so_qstate & SQ_COMP, so->so_qstate & SQ_INCOMP));
722 if (so->so_options & SO_ACCEPTCONN) {
723 KASSERT((TAILQ_EMPTY(&so->so_comp)),
724 ("sofree: so_comp populated"));
725 KASSERT((TAILQ_EMPTY(&so->so_incomp)),
726 ("sofree: so_incomp populated"));
732 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
733 (*pr->pr_domain->dom_dispose)(so->so_rcv.sb_mb);
734 if (pr->pr_usrreqs->pru_detach != NULL)
735 (*pr->pr_usrreqs->pru_detach)(so);
738 * From this point on, we assume that no other references to this
739 * socket exist anywhere else in the stack. Therefore, no locks need
740 * to be acquired or held.
742 * We used to do a lot of socket buffer and socket locking here, as
743 * well as invoke sorflush() and perform wakeups. The direct call to
744 * dom_dispose() and sbrelease_internal() are an inlining of what was
745 * necessary from sorflush().
747 * Notice that the socket buffer and kqueue state are torn down
748 * before calling pru_detach. This means that protocols shold not
749 * assume they can perform socket wakeups, etc, in their detach code.
751 sbdestroy(&so->so_snd, so);
752 sbdestroy(&so->so_rcv, so);
753 seldrain(&so->so_snd.sb_sel);
754 seldrain(&so->so_rcv.sb_sel);
755 knlist_destroy(&so->so_rcv.sb_sel.si_note);
756 knlist_destroy(&so->so_snd.sb_sel.si_note);
761 * Close a socket on last file table reference removal. Initiate disconnect
762 * if connected. Free socket when disconnect complete.
764 * This function will sorele() the socket. Note that soclose() may be called
765 * prior to the ref count reaching zero. The actual socket structure will
766 * not be freed until the ref count reaches zero.
769 soclose(struct socket *so)
773 KASSERT(!(so->so_state & SS_NOFDREF), ("soclose: SS_NOFDREF on enter"));
775 CURVNET_SET(so->so_vnet);
776 funsetown(&so->so_sigio);
777 if (so->so_state & SS_ISCONNECTED) {
778 if ((so->so_state & SS_ISDISCONNECTING) == 0) {
779 error = sodisconnect(so);
781 if (error == ENOTCONN)
786 if (so->so_options & SO_LINGER) {
787 if ((so->so_state & SS_ISDISCONNECTING) &&
788 (so->so_state & SS_NBIO))
790 while (so->so_state & SS_ISCONNECTED) {
791 error = tsleep(&so->so_timeo,
792 PSOCK | PCATCH, "soclos",
801 if (so->so_proto->pr_usrreqs->pru_close != NULL)
802 (*so->so_proto->pr_usrreqs->pru_close)(so);
804 if (so->so_options & SO_ACCEPTCONN) {
807 * Prevent new additions to the accept queues due
808 * to ACCEPT_LOCK races while we are draining them.
810 so->so_options &= ~SO_ACCEPTCONN;
811 while ((sp = TAILQ_FIRST(&so->so_incomp)) != NULL) {
812 TAILQ_REMOVE(&so->so_incomp, sp, so_list);
814 sp->so_qstate &= ~SQ_INCOMP;
820 while ((sp = TAILQ_FIRST(&so->so_comp)) != NULL) {
821 TAILQ_REMOVE(&so->so_comp, sp, so_list);
823 sp->so_qstate &= ~SQ_COMP;
829 KASSERT((TAILQ_EMPTY(&so->so_comp)),
830 ("%s: so_comp populated", __func__));
831 KASSERT((TAILQ_EMPTY(&so->so_incomp)),
832 ("%s: so_incomp populated", __func__));
835 KASSERT((so->so_state & SS_NOFDREF) == 0, ("soclose: NOFDREF"));
836 so->so_state |= SS_NOFDREF;
837 sorele(so); /* NB: Returns with ACCEPT_UNLOCK(). */
843 * soabort() is used to abruptly tear down a connection, such as when a
844 * resource limit is reached (listen queue depth exceeded), or if a listen
845 * socket is closed while there are sockets waiting to be accepted.
847 * This interface is tricky, because it is called on an unreferenced socket,
848 * and must be called only by a thread that has actually removed the socket
849 * from the listen queue it was on, or races with other threads are risked.
851 * This interface will call into the protocol code, so must not be called
852 * with any socket locks held. Protocols do call it while holding their own
853 * recursible protocol mutexes, but this is something that should be subject
854 * to review in the future.
857 soabort(struct socket *so)
861 * In as much as is possible, assert that no references to this
862 * socket are held. This is not quite the same as asserting that the
863 * current thread is responsible for arranging for no references, but
864 * is as close as we can get for now.
866 KASSERT(so->so_count == 0, ("soabort: so_count"));
867 KASSERT((so->so_state & SS_PROTOREF) == 0, ("soabort: SS_PROTOREF"));
868 KASSERT(so->so_state & SS_NOFDREF, ("soabort: !SS_NOFDREF"));
869 KASSERT((so->so_state & SQ_COMP) == 0, ("soabort: SQ_COMP"));
870 KASSERT((so->so_state & SQ_INCOMP) == 0, ("soabort: SQ_INCOMP"));
873 if (so->so_proto->pr_usrreqs->pru_abort != NULL)
874 (*so->so_proto->pr_usrreqs->pru_abort)(so);
881 soaccept(struct socket *so, struct sockaddr **nam)
886 KASSERT((so->so_state & SS_NOFDREF) != 0, ("soaccept: !NOFDREF"));
887 so->so_state &= ~SS_NOFDREF;
890 CURVNET_SET(so->so_vnet);
891 error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam);
897 soconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
900 return (soconnectat(AT_FDCWD, so, nam, td));
904 soconnectat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
908 if (so->so_options & SO_ACCEPTCONN)
911 CURVNET_SET(so->so_vnet);
913 * If protocol is connection-based, can only connect once.
914 * Otherwise, if connected, try to disconnect first. This allows
915 * user to disconnect by connecting to, e.g., a null address.
917 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
918 ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
919 (error = sodisconnect(so)))) {
923 * Prevent accumulated error from previous connection from
927 if (fd == AT_FDCWD) {
928 error = (*so->so_proto->pr_usrreqs->pru_connect)(so,
931 error = (*so->so_proto->pr_usrreqs->pru_connectat)(fd,
941 soconnect2(struct socket *so1, struct socket *so2)
945 CURVNET_SET(so1->so_vnet);
946 error = (*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2);
952 sodisconnect(struct socket *so)
956 if ((so->so_state & SS_ISCONNECTED) == 0)
958 if (so->so_state & SS_ISDISCONNECTING)
961 error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so);
965 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? 0 : SBL_WAIT)
968 sosend_dgram(struct socket *so, struct sockaddr *addr, struct uio *uio,
969 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
973 int clen = 0, error, dontroute;
975 KASSERT(so->so_type == SOCK_DGRAM, ("sosend_dgram: !SOCK_DGRAM"));
976 KASSERT(so->so_proto->pr_flags & PR_ATOMIC,
977 ("sosend_dgram: !PR_ATOMIC"));
980 resid = uio->uio_resid;
982 resid = top->m_pkthdr.len;
984 * In theory resid should be unsigned. However, space must be
985 * signed, as it might be less than 0 if we over-committed, and we
986 * must use a signed comparison of space and resid. On the other
987 * hand, a negative resid causes us to loop sending 0-length
988 * segments to the protocol.
996 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0;
998 td->td_ru.ru_msgsnd++;
1000 clen = control->m_len;
1002 SOCKBUF_LOCK(&so->so_snd);
1003 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1004 SOCKBUF_UNLOCK(&so->so_snd);
1009 error = so->so_error;
1011 SOCKBUF_UNLOCK(&so->so_snd);
1014 if ((so->so_state & SS_ISCONNECTED) == 0) {
1016 * `sendto' and `sendmsg' is allowed on a connection-based
1017 * socket if it supports implied connect. Return ENOTCONN if
1018 * not connected and no address is supplied.
1020 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1021 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1022 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1023 !(resid == 0 && clen != 0)) {
1024 SOCKBUF_UNLOCK(&so->so_snd);
1028 } else if (addr == NULL) {
1029 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1032 error = EDESTADDRREQ;
1033 SOCKBUF_UNLOCK(&so->so_snd);
1039 * Do we need MSG_OOB support in SOCK_DGRAM? Signs here may be a
1040 * problem and need fixing.
1042 space = sbspace(&so->so_snd);
1043 if (flags & MSG_OOB)
1046 SOCKBUF_UNLOCK(&so->so_snd);
1047 if (resid > space) {
1053 if (flags & MSG_EOR)
1054 top->m_flags |= M_EOR;
1057 * Copy the data from userland into a mbuf chain.
1058 * If no data is to be copied in, a single empty mbuf
1061 top = m_uiotombuf(uio, M_WAITOK, space, max_hdr,
1062 (M_PKTHDR | ((flags & MSG_EOR) ? M_EOR : 0)));
1064 error = EFAULT; /* only possible error */
1067 space -= resid - uio->uio_resid;
1068 resid = uio->uio_resid;
1070 KASSERT(resid == 0, ("sosend_dgram: resid != 0"));
1072 * XXXRW: Frobbing SO_DONTROUTE here is even worse without sblock
1077 so->so_options |= SO_DONTROUTE;
1081 * XXX all the SBS_CANTSENDMORE checks previously done could be out
1082 * of date. We could have recieved a reset packet in an interrupt or
1083 * maybe we slept while doing page faults in uiomove() etc. We could
1084 * probably recheck again inside the locking protection here, but
1085 * there are probably other places that this also happens. We must
1089 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1090 (flags & MSG_OOB) ? PRUS_OOB :
1092 * If the user set MSG_EOF, the protocol understands this flag and
1093 * nothing left to send then use PRU_SEND_EOF instead of PRU_SEND.
1095 ((flags & MSG_EOF) &&
1096 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1099 /* If there is more to send set PRUS_MORETOCOME */
1100 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1101 top, addr, control, td);
1104 so->so_options &= ~SO_DONTROUTE;
1113 if (control != NULL)
1119 * Send on a socket. If send must go all at once and message is larger than
1120 * send buffering, then hard error. Lock against other senders. If must go
1121 * all at once and not enough room now, then inform user that this would
1122 * block and do nothing. Otherwise, if nonblocking, send as much as
1123 * possible. The data to be sent is described by "uio" if nonzero, otherwise
1124 * by the mbuf chain "top" (which must be null if uio is not). Data provided
1125 * in mbuf chain must be small enough to send all at once.
1127 * Returns nonzero on error, timeout or signal; callers must check for short
1128 * counts if EINTR/ERESTART are returned. Data and control buffers are freed
1132 sosend_generic(struct socket *so, struct sockaddr *addr, struct uio *uio,
1133 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1137 int clen = 0, error, dontroute;
1138 int atomic = sosendallatonce(so) || top;
1141 resid = uio->uio_resid;
1143 resid = top->m_pkthdr.len;
1145 * In theory resid should be unsigned. However, space must be
1146 * signed, as it might be less than 0 if we over-committed, and we
1147 * must use a signed comparison of space and resid. On the other
1148 * hand, a negative resid causes us to loop sending 0-length
1149 * segments to the protocol.
1151 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
1152 * type sockets since that's an error.
1154 if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
1160 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
1161 (so->so_proto->pr_flags & PR_ATOMIC);
1163 td->td_ru.ru_msgsnd++;
1164 if (control != NULL)
1165 clen = control->m_len;
1167 error = sblock(&so->so_snd, SBLOCKWAIT(flags));
1173 SOCKBUF_LOCK(&so->so_snd);
1174 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1175 SOCKBUF_UNLOCK(&so->so_snd);
1180 error = so->so_error;
1182 SOCKBUF_UNLOCK(&so->so_snd);
1185 if ((so->so_state & SS_ISCONNECTED) == 0) {
1187 * `sendto' and `sendmsg' is allowed on a connection-
1188 * based socket if it supports implied connect.
1189 * Return ENOTCONN if not connected and no address is
1192 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1193 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1194 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1195 !(resid == 0 && clen != 0)) {
1196 SOCKBUF_UNLOCK(&so->so_snd);
1200 } else if (addr == NULL) {
1201 SOCKBUF_UNLOCK(&so->so_snd);
1202 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1205 error = EDESTADDRREQ;
1209 space = sbspace(&so->so_snd);
1210 if (flags & MSG_OOB)
1212 if ((atomic && resid > so->so_snd.sb_hiwat) ||
1213 clen > so->so_snd.sb_hiwat) {
1214 SOCKBUF_UNLOCK(&so->so_snd);
1218 if (space < resid + clen &&
1219 (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1220 if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1221 SOCKBUF_UNLOCK(&so->so_snd);
1222 error = EWOULDBLOCK;
1225 error = sbwait(&so->so_snd);
1226 SOCKBUF_UNLOCK(&so->so_snd);
1231 SOCKBUF_UNLOCK(&so->so_snd);
1236 if (flags & MSG_EOR)
1237 top->m_flags |= M_EOR;
1240 * Copy the data from userland into a mbuf
1241 * chain. If no data is to be copied in,
1242 * a single empty mbuf is returned.
1244 top = m_uiotombuf(uio, M_WAITOK, space,
1245 (atomic ? max_hdr : 0),
1246 (atomic ? M_PKTHDR : 0) |
1247 ((flags & MSG_EOR) ? M_EOR : 0));
1249 error = EFAULT; /* only possible error */
1252 space -= resid - uio->uio_resid;
1253 resid = uio->uio_resid;
1257 so->so_options |= SO_DONTROUTE;
1261 * XXX all the SBS_CANTSENDMORE checks previously
1262 * done could be out of date. We could have recieved
1263 * a reset packet in an interrupt or maybe we slept
1264 * while doing page faults in uiomove() etc. We
1265 * could probably recheck again inside the locking
1266 * protection here, but there are probably other
1267 * places that this also happens. We must rethink
1271 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1272 (flags & MSG_OOB) ? PRUS_OOB :
1274 * If the user set MSG_EOF, the protocol understands
1275 * this flag and nothing left to send then use
1276 * PRU_SEND_EOF instead of PRU_SEND.
1278 ((flags & MSG_EOF) &&
1279 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1282 /* If there is more to send set PRUS_MORETOCOME. */
1283 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1284 top, addr, control, td);
1287 so->so_options &= ~SO_DONTROUTE;
1295 } while (resid && space > 0);
1299 sbunlock(&so->so_snd);
1303 if (control != NULL)
1309 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
1310 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1314 CURVNET_SET(so->so_vnet);
1315 error = so->so_proto->pr_usrreqs->pru_sosend(so, addr, uio, top,
1316 control, flags, td);
1322 * The part of soreceive() that implements reading non-inline out-of-band
1323 * data from a socket. For more complete comments, see soreceive(), from
1324 * which this code originated.
1326 * Note that soreceive_rcvoob(), unlike the remainder of soreceive(), is
1327 * unable to return an mbuf chain to the caller.
1330 soreceive_rcvoob(struct socket *so, struct uio *uio, int flags)
1332 struct protosw *pr = so->so_proto;
1336 KASSERT(flags & MSG_OOB, ("soreceive_rcvoob: (flags & MSG_OOB) == 0"));
1339 m = m_get(M_WAITOK, MT_DATA);
1340 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK);
1344 error = uiomove(mtod(m, void *),
1345 (int) min(uio->uio_resid, m->m_len), uio);
1347 } while (uio->uio_resid && error == 0 && m);
1355 * Following replacement or removal of the first mbuf on the first mbuf chain
1356 * of a socket buffer, push necessary state changes back into the socket
1357 * buffer so that other consumers see the values consistently. 'nextrecord'
1358 * is the callers locally stored value of the original value of
1359 * sb->sb_mb->m_nextpkt which must be restored when the lead mbuf changes.
1360 * NOTE: 'nextrecord' may be NULL.
1362 static __inline void
1363 sockbuf_pushsync(struct sockbuf *sb, struct mbuf *nextrecord)
1366 SOCKBUF_LOCK_ASSERT(sb);
1368 * First, update for the new value of nextrecord. If necessary, make
1369 * it the first record.
1371 if (sb->sb_mb != NULL)
1372 sb->sb_mb->m_nextpkt = nextrecord;
1374 sb->sb_mb = nextrecord;
1377 * Now update any dependent socket buffer fields to reflect the new
1378 * state. This is an expanded inline of SB_EMPTY_FIXUP(), with the
1379 * addition of a second clause that takes care of the case where
1380 * sb_mb has been updated, but remains the last record.
1382 if (sb->sb_mb == NULL) {
1383 sb->sb_mbtail = NULL;
1384 sb->sb_lastrecord = NULL;
1385 } else if (sb->sb_mb->m_nextpkt == NULL)
1386 sb->sb_lastrecord = sb->sb_mb;
1390 * Implement receive operations on a socket. We depend on the way that
1391 * records are added to the sockbuf by sbappend. In particular, each record
1392 * (mbufs linked through m_next) must begin with an address if the protocol
1393 * so specifies, followed by an optional mbuf or mbufs containing ancillary
1394 * data, and then zero or more mbufs of data. In order to allow parallelism
1395 * between network receive and copying to user space, as well as avoid
1396 * sleeping with a mutex held, we release the socket buffer mutex during the
1397 * user space copy. Although the sockbuf is locked, new data may still be
1398 * appended, and thus we must maintain consistency of the sockbuf during that
1401 * The caller may receive the data as a single mbuf chain by supplying an
1402 * mbuf **mp0 for use in returning the chain. The uio is then used only for
1403 * the count in uio_resid.
1406 soreceive_generic(struct socket *so, struct sockaddr **psa, struct uio *uio,
1407 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1409 struct mbuf *m, **mp;
1410 int flags, error, offset;
1412 struct protosw *pr = so->so_proto;
1413 struct mbuf *nextrecord;
1415 ssize_t orig_resid = uio->uio_resid;
1420 if (controlp != NULL)
1423 flags = *flagsp &~ MSG_EOR;
1426 if (flags & MSG_OOB)
1427 return (soreceive_rcvoob(so, uio, flags));
1430 if ((pr->pr_flags & PR_WANTRCVD) && (so->so_state & SS_ISCONFIRMING)
1431 && uio->uio_resid) {
1433 (*pr->pr_usrreqs->pru_rcvd)(so, 0);
1436 error = sblock(&so->so_rcv, SBLOCKWAIT(flags));
1441 SOCKBUF_LOCK(&so->so_rcv);
1442 m = so->so_rcv.sb_mb;
1444 * If we have less data than requested, block awaiting more (subject
1445 * to any timeout) if:
1446 * 1. the current count is less than the low water mark, or
1447 * 2. MSG_DONTWAIT is not set
1449 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
1450 so->so_rcv.sb_cc < uio->uio_resid) &&
1451 so->so_rcv.sb_cc < so->so_rcv.sb_lowat &&
1452 m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) {
1453 KASSERT(m != NULL || !so->so_rcv.sb_cc,
1454 ("receive: m == %p so->so_rcv.sb_cc == %u",
1455 m, so->so_rcv.sb_cc));
1459 error = so->so_error;
1460 if ((flags & MSG_PEEK) == 0)
1462 SOCKBUF_UNLOCK(&so->so_rcv);
1465 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1466 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
1468 SOCKBUF_UNLOCK(&so->so_rcv);
1473 for (; m != NULL; m = m->m_next)
1474 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1475 m = so->so_rcv.sb_mb;
1478 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1479 (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1480 SOCKBUF_UNLOCK(&so->so_rcv);
1484 if (uio->uio_resid == 0) {
1485 SOCKBUF_UNLOCK(&so->so_rcv);
1488 if ((so->so_state & SS_NBIO) ||
1489 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1490 SOCKBUF_UNLOCK(&so->so_rcv);
1491 error = EWOULDBLOCK;
1494 SBLASTRECORDCHK(&so->so_rcv);
1495 SBLASTMBUFCHK(&so->so_rcv);
1496 error = sbwait(&so->so_rcv);
1497 SOCKBUF_UNLOCK(&so->so_rcv);
1504 * From this point onward, we maintain 'nextrecord' as a cache of the
1505 * pointer to the next record in the socket buffer. We must keep the
1506 * various socket buffer pointers and local stack versions of the
1507 * pointers in sync, pushing out modifications before dropping the
1508 * socket buffer mutex, and re-reading them when picking it up.
1510 * Otherwise, we will race with the network stack appending new data
1511 * or records onto the socket buffer by using inconsistent/stale
1512 * versions of the field, possibly resulting in socket buffer
1515 * By holding the high-level sblock(), we prevent simultaneous
1516 * readers from pulling off the front of the socket buffer.
1518 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1520 uio->uio_td->td_ru.ru_msgrcv++;
1521 KASSERT(m == so->so_rcv.sb_mb, ("soreceive: m != so->so_rcv.sb_mb"));
1522 SBLASTRECORDCHK(&so->so_rcv);
1523 SBLASTMBUFCHK(&so->so_rcv);
1524 nextrecord = m->m_nextpkt;
1525 if (pr->pr_flags & PR_ADDR) {
1526 KASSERT(m->m_type == MT_SONAME,
1527 ("m->m_type == %d", m->m_type));
1530 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
1532 if (flags & MSG_PEEK) {
1535 sbfree(&so->so_rcv, m);
1536 so->so_rcv.sb_mb = m_free(m);
1537 m = so->so_rcv.sb_mb;
1538 sockbuf_pushsync(&so->so_rcv, nextrecord);
1543 * Process one or more MT_CONTROL mbufs present before any data mbufs
1544 * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1545 * just copy the data; if !MSG_PEEK, we call into the protocol to
1546 * perform externalization (or freeing if controlp == NULL).
1548 if (m != NULL && m->m_type == MT_CONTROL) {
1549 struct mbuf *cm = NULL, *cmn;
1550 struct mbuf **cme = &cm;
1553 if (flags & MSG_PEEK) {
1554 if (controlp != NULL) {
1555 *controlp = m_copy(m, 0, m->m_len);
1556 controlp = &(*controlp)->m_next;
1560 sbfree(&so->so_rcv, m);
1561 so->so_rcv.sb_mb = m->m_next;
1564 cme = &(*cme)->m_next;
1565 m = so->so_rcv.sb_mb;
1567 } while (m != NULL && m->m_type == MT_CONTROL);
1568 if ((flags & MSG_PEEK) == 0)
1569 sockbuf_pushsync(&so->so_rcv, nextrecord);
1570 while (cm != NULL) {
1573 if (pr->pr_domain->dom_externalize != NULL) {
1574 SOCKBUF_UNLOCK(&so->so_rcv);
1576 error = (*pr->pr_domain->dom_externalize)
1577 (cm, controlp, flags);
1578 SOCKBUF_LOCK(&so->so_rcv);
1579 } else if (controlp != NULL)
1583 if (controlp != NULL) {
1585 while (*controlp != NULL)
1586 controlp = &(*controlp)->m_next;
1591 nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1593 nextrecord = so->so_rcv.sb_mb;
1597 if ((flags & MSG_PEEK) == 0) {
1598 KASSERT(m->m_nextpkt == nextrecord,
1599 ("soreceive: post-control, nextrecord !sync"));
1600 if (nextrecord == NULL) {
1601 KASSERT(so->so_rcv.sb_mb == m,
1602 ("soreceive: post-control, sb_mb!=m"));
1603 KASSERT(so->so_rcv.sb_lastrecord == m,
1604 ("soreceive: post-control, lastrecord!=m"));
1608 if (type == MT_OOBDATA)
1611 if ((flags & MSG_PEEK) == 0) {
1612 KASSERT(so->so_rcv.sb_mb == nextrecord,
1613 ("soreceive: sb_mb != nextrecord"));
1614 if (so->so_rcv.sb_mb == NULL) {
1615 KASSERT(so->so_rcv.sb_lastrecord == NULL,
1616 ("soreceive: sb_lastercord != NULL"));
1620 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1621 SBLASTRECORDCHK(&so->so_rcv);
1622 SBLASTMBUFCHK(&so->so_rcv);
1625 * Now continue to read any data mbufs off of the head of the socket
1626 * buffer until the read request is satisfied. Note that 'type' is
1627 * used to store the type of any mbuf reads that have happened so far
1628 * such that soreceive() can stop reading if the type changes, which
1629 * causes soreceive() to return only one of regular data and inline
1630 * out-of-band data in a single socket receive operation.
1634 while (m != NULL && uio->uio_resid > 0 && error == 0) {
1636 * If the type of mbuf has changed since the last mbuf
1637 * examined ('type'), end the receive operation.
1639 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1640 if (m->m_type == MT_OOBDATA || m->m_type == MT_CONTROL) {
1641 if (type != m->m_type)
1643 } else if (type == MT_OOBDATA)
1646 KASSERT(m->m_type == MT_DATA,
1647 ("m->m_type == %d", m->m_type));
1648 so->so_rcv.sb_state &= ~SBS_RCVATMARK;
1649 len = uio->uio_resid;
1650 if (so->so_oobmark && len > so->so_oobmark - offset)
1651 len = so->so_oobmark - offset;
1652 if (len > m->m_len - moff)
1653 len = m->m_len - moff;
1655 * If mp is set, just pass back the mbufs. Otherwise copy
1656 * them out via the uio, then free. Sockbuf must be
1657 * consistent here (points to current mbuf, it points to next
1658 * record) when we drop priority; we must note any additions
1659 * to the sockbuf when we block interrupts again.
1662 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1663 SBLASTRECORDCHK(&so->so_rcv);
1664 SBLASTMBUFCHK(&so->so_rcv);
1665 SOCKBUF_UNLOCK(&so->so_rcv);
1666 error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1667 SOCKBUF_LOCK(&so->so_rcv);
1670 * The MT_SONAME mbuf has already been removed
1671 * from the record, so it is necessary to
1672 * remove the data mbufs, if any, to preserve
1673 * the invariant in the case of PR_ADDR that
1674 * requires MT_SONAME mbufs at the head of
1677 if (m && pr->pr_flags & PR_ATOMIC &&
1678 ((flags & MSG_PEEK) == 0))
1679 (void)sbdroprecord_locked(&so->so_rcv);
1680 SOCKBUF_UNLOCK(&so->so_rcv);
1684 uio->uio_resid -= len;
1685 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1686 if (len == m->m_len - moff) {
1687 if (m->m_flags & M_EOR)
1689 if (flags & MSG_PEEK) {
1693 nextrecord = m->m_nextpkt;
1694 sbfree(&so->so_rcv, m);
1696 m->m_nextpkt = NULL;
1699 so->so_rcv.sb_mb = m = m->m_next;
1702 so->so_rcv.sb_mb = m_free(m);
1703 m = so->so_rcv.sb_mb;
1705 sockbuf_pushsync(&so->so_rcv, nextrecord);
1706 SBLASTRECORDCHK(&so->so_rcv);
1707 SBLASTMBUFCHK(&so->so_rcv);
1710 if (flags & MSG_PEEK)
1716 if (flags & MSG_DONTWAIT)
1717 copy_flag = M_NOWAIT;
1720 if (copy_flag == M_WAITOK)
1721 SOCKBUF_UNLOCK(&so->so_rcv);
1722 *mp = m_copym(m, 0, len, copy_flag);
1723 if (copy_flag == M_WAITOK)
1724 SOCKBUF_LOCK(&so->so_rcv);
1727 * m_copym() couldn't
1728 * allocate an mbuf. Adjust
1729 * uio_resid back (it was
1730 * adjusted down by len
1731 * bytes, which we didn't end
1732 * up "copying" over).
1734 uio->uio_resid += len;
1740 so->so_rcv.sb_cc -= len;
1743 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1744 if (so->so_oobmark) {
1745 if ((flags & MSG_PEEK) == 0) {
1746 so->so_oobmark -= len;
1747 if (so->so_oobmark == 0) {
1748 so->so_rcv.sb_state |= SBS_RCVATMARK;
1753 if (offset == so->so_oobmark)
1757 if (flags & MSG_EOR)
1760 * If the MSG_WAITALL flag is set (for non-atomic socket), we
1761 * must not quit until "uio->uio_resid == 0" or an error
1762 * termination. If a signal/timeout occurs, return with a
1763 * short count but without error. Keep sockbuf locked
1764 * against other readers.
1766 while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1767 !sosendallatonce(so) && nextrecord == NULL) {
1768 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1770 so->so_rcv.sb_state & SBS_CANTRCVMORE)
1773 * Notify the protocol that some data has been
1774 * drained before blocking.
1776 if (pr->pr_flags & PR_WANTRCVD) {
1777 SOCKBUF_UNLOCK(&so->so_rcv);
1779 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
1780 SOCKBUF_LOCK(&so->so_rcv);
1782 SBLASTRECORDCHK(&so->so_rcv);
1783 SBLASTMBUFCHK(&so->so_rcv);
1785 * We could receive some data while was notifying
1786 * the protocol. Skip blocking in this case.
1788 if (so->so_rcv.sb_mb == NULL) {
1789 error = sbwait(&so->so_rcv);
1791 SOCKBUF_UNLOCK(&so->so_rcv);
1795 m = so->so_rcv.sb_mb;
1797 nextrecord = m->m_nextpkt;
1801 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1802 if (m != NULL && pr->pr_flags & PR_ATOMIC) {
1804 if ((flags & MSG_PEEK) == 0)
1805 (void) sbdroprecord_locked(&so->so_rcv);
1807 if ((flags & MSG_PEEK) == 0) {
1810 * First part is an inline SB_EMPTY_FIXUP(). Second
1811 * part makes sure sb_lastrecord is up-to-date if
1812 * there is still data in the socket buffer.
1814 so->so_rcv.sb_mb = nextrecord;
1815 if (so->so_rcv.sb_mb == NULL) {
1816 so->so_rcv.sb_mbtail = NULL;
1817 so->so_rcv.sb_lastrecord = NULL;
1818 } else if (nextrecord->m_nextpkt == NULL)
1819 so->so_rcv.sb_lastrecord = nextrecord;
1821 SBLASTRECORDCHK(&so->so_rcv);
1822 SBLASTMBUFCHK(&so->so_rcv);
1824 * If soreceive() is being done from the socket callback,
1825 * then don't need to generate ACK to peer to update window,
1826 * since ACK will be generated on return to TCP.
1828 if (!(flags & MSG_SOCALLBCK) &&
1829 (pr->pr_flags & PR_WANTRCVD)) {
1830 SOCKBUF_UNLOCK(&so->so_rcv);
1832 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
1833 SOCKBUF_LOCK(&so->so_rcv);
1836 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1837 if (orig_resid == uio->uio_resid && orig_resid &&
1838 (flags & MSG_EOR) == 0 && (so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0) {
1839 SOCKBUF_UNLOCK(&so->so_rcv);
1842 SOCKBUF_UNLOCK(&so->so_rcv);
1847 sbunlock(&so->so_rcv);
1852 * Optimized version of soreceive() for stream (TCP) sockets.
1853 * XXXAO: (MSG_WAITALL | MSG_PEEK) isn't properly handled.
1856 soreceive_stream(struct socket *so, struct sockaddr **psa, struct uio *uio,
1857 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1859 int len = 0, error = 0, flags, oresid;
1861 struct mbuf *m, *n = NULL;
1863 /* We only do stream sockets. */
1864 if (so->so_type != SOCK_STREAM)
1868 if (controlp != NULL)
1871 flags = *flagsp &~ MSG_EOR;
1874 if (flags & MSG_OOB)
1875 return (soreceive_rcvoob(so, uio, flags));
1881 /* Prevent other readers from entering the socket. */
1882 error = sblock(sb, SBLOCKWAIT(flags));
1887 /* Easy one, no space to copyout anything. */
1888 if (uio->uio_resid == 0) {
1892 oresid = uio->uio_resid;
1894 /* We will never ever get anything unless we are or were connected. */
1895 if (!(so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED))) {
1901 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1903 /* Abort if socket has reported problems. */
1907 if (oresid > uio->uio_resid)
1909 error = so->so_error;
1910 if (!(flags & MSG_PEEK))
1915 /* Door is closed. Deliver what is left, if any. */
1916 if (sb->sb_state & SBS_CANTRCVMORE) {
1923 /* Socket buffer is empty and we shall not block. */
1924 if (sb->sb_cc == 0 &&
1925 ((so->so_state & SS_NBIO) || (flags & (MSG_DONTWAIT|MSG_NBIO)))) {
1930 /* Socket buffer got some data that we shall deliver now. */
1931 if (sb->sb_cc > 0 && !(flags & MSG_WAITALL) &&
1932 ((sb->sb_flags & SS_NBIO) ||
1933 (flags & (MSG_DONTWAIT|MSG_NBIO)) ||
1934 sb->sb_cc >= sb->sb_lowat ||
1935 sb->sb_cc >= uio->uio_resid ||
1936 sb->sb_cc >= sb->sb_hiwat) ) {
1940 /* On MSG_WAITALL we must wait until all data or error arrives. */
1941 if ((flags & MSG_WAITALL) &&
1942 (sb->sb_cc >= uio->uio_resid || sb->sb_cc >= sb->sb_hiwat))
1946 * Wait and block until (more) data comes in.
1947 * NB: Drops the sockbuf lock during wait.
1955 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1956 KASSERT(sb->sb_cc > 0, ("%s: sockbuf empty", __func__));
1957 KASSERT(sb->sb_mb != NULL, ("%s: sb_mb == NULL", __func__));
1961 uio->uio_td->td_ru.ru_msgrcv++;
1963 /* Fill uio until full or current end of socket buffer is reached. */
1964 len = min(uio->uio_resid, sb->sb_cc);
1966 /* Dequeue as many mbufs as possible. */
1967 if (!(flags & MSG_PEEK) && len >= sb->sb_mb->m_len) {
1971 m_cat(*mp0, sb->sb_mb);
1973 m != NULL && m->m_len <= len;
1976 uio->uio_resid -= m->m_len;
1982 sb->sb_lastrecord = sb->sb_mb;
1983 if (sb->sb_mb == NULL)
1986 /* Copy the remainder. */
1988 KASSERT(sb->sb_mb != NULL,
1989 ("%s: len > 0 && sb->sb_mb empty", __func__));
1991 m = m_copym(sb->sb_mb, 0, len, M_NOWAIT);
1993 len = 0; /* Don't flush data from sockbuf. */
1995 uio->uio_resid -= len;
2006 /* NB: Must unlock socket buffer as uiomove may sleep. */
2008 error = m_mbuftouio(uio, sb->sb_mb, len);
2013 SBLASTRECORDCHK(sb);
2017 * Remove the delivered data from the socket buffer unless we
2018 * were only peeking.
2020 if (!(flags & MSG_PEEK)) {
2022 sbdrop_locked(sb, len);
2024 /* Notify protocol that we drained some data. */
2025 if ((so->so_proto->pr_flags & PR_WANTRCVD) &&
2026 (((flags & MSG_WAITALL) && uio->uio_resid > 0) ||
2027 !(flags & MSG_SOCALLBCK))) {
2030 (*so->so_proto->pr_usrreqs->pru_rcvd)(so, flags);
2036 * For MSG_WAITALL we may have to loop again and wait for
2037 * more data to come in.
2039 if ((flags & MSG_WAITALL) && uio->uio_resid > 0)
2042 SOCKBUF_LOCK_ASSERT(sb);
2043 SBLASTRECORDCHK(sb);
2051 * Optimized version of soreceive() for simple datagram cases from userspace.
2052 * Unlike in the stream case, we're able to drop a datagram if copyout()
2053 * fails, and because we handle datagrams atomically, we don't need to use a
2054 * sleep lock to prevent I/O interlacing.
2057 soreceive_dgram(struct socket *so, struct sockaddr **psa, struct uio *uio,
2058 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2060 struct mbuf *m, *m2;
2063 struct protosw *pr = so->so_proto;
2064 struct mbuf *nextrecord;
2068 if (controlp != NULL)
2071 flags = *flagsp &~ MSG_EOR;
2076 * For any complicated cases, fall back to the full
2077 * soreceive_generic().
2079 if (mp0 != NULL || (flags & MSG_PEEK) || (flags & MSG_OOB))
2080 return (soreceive_generic(so, psa, uio, mp0, controlp,
2084 * Enforce restrictions on use.
2086 KASSERT((pr->pr_flags & PR_WANTRCVD) == 0,
2087 ("soreceive_dgram: wantrcvd"));
2088 KASSERT(pr->pr_flags & PR_ATOMIC, ("soreceive_dgram: !atomic"));
2089 KASSERT((so->so_rcv.sb_state & SBS_RCVATMARK) == 0,
2090 ("soreceive_dgram: SBS_RCVATMARK"));
2091 KASSERT((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0,
2092 ("soreceive_dgram: P_CONNREQUIRED"));
2095 * Loop blocking while waiting for a datagram.
2097 SOCKBUF_LOCK(&so->so_rcv);
2098 while ((m = so->so_rcv.sb_mb) == NULL) {
2099 KASSERT(so->so_rcv.sb_cc == 0,
2100 ("soreceive_dgram: sb_mb NULL but sb_cc %u",
2103 error = so->so_error;
2105 SOCKBUF_UNLOCK(&so->so_rcv);
2108 if (so->so_rcv.sb_state & SBS_CANTRCVMORE ||
2109 uio->uio_resid == 0) {
2110 SOCKBUF_UNLOCK(&so->so_rcv);
2113 if ((so->so_state & SS_NBIO) ||
2114 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
2115 SOCKBUF_UNLOCK(&so->so_rcv);
2116 return (EWOULDBLOCK);
2118 SBLASTRECORDCHK(&so->so_rcv);
2119 SBLASTMBUFCHK(&so->so_rcv);
2120 error = sbwait(&so->so_rcv);
2122 SOCKBUF_UNLOCK(&so->so_rcv);
2126 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2129 uio->uio_td->td_ru.ru_msgrcv++;
2130 SBLASTRECORDCHK(&so->so_rcv);
2131 SBLASTMBUFCHK(&so->so_rcv);
2132 nextrecord = m->m_nextpkt;
2133 if (nextrecord == NULL) {
2134 KASSERT(so->so_rcv.sb_lastrecord == m,
2135 ("soreceive_dgram: lastrecord != m"));
2138 KASSERT(so->so_rcv.sb_mb->m_nextpkt == nextrecord,
2139 ("soreceive_dgram: m_nextpkt != nextrecord"));
2142 * Pull 'm' and its chain off the front of the packet queue.
2144 so->so_rcv.sb_mb = NULL;
2145 sockbuf_pushsync(&so->so_rcv, nextrecord);
2148 * Walk 'm's chain and free that many bytes from the socket buffer.
2150 for (m2 = m; m2 != NULL; m2 = m2->m_next)
2151 sbfree(&so->so_rcv, m2);
2154 * Do a few last checks before we let go of the lock.
2156 SBLASTRECORDCHK(&so->so_rcv);
2157 SBLASTMBUFCHK(&so->so_rcv);
2158 SOCKBUF_UNLOCK(&so->so_rcv);
2160 if (pr->pr_flags & PR_ADDR) {
2161 KASSERT(m->m_type == MT_SONAME,
2162 ("m->m_type == %d", m->m_type));
2164 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
2169 /* XXXRW: Can this happen? */
2174 * Packet to copyout() is now in 'm' and it is disconnected from the
2177 * Process one or more MT_CONTROL mbufs present before any data mbufs
2178 * in the first mbuf chain on the socket buffer. We call into the
2179 * protocol to perform externalization (or freeing if controlp ==
2182 if (m->m_type == MT_CONTROL) {
2183 struct mbuf *cm = NULL, *cmn;
2184 struct mbuf **cme = &cm;
2190 cme = &(*cme)->m_next;
2192 } while (m != NULL && m->m_type == MT_CONTROL);
2193 while (cm != NULL) {
2196 if (pr->pr_domain->dom_externalize != NULL) {
2197 error = (*pr->pr_domain->dom_externalize)
2198 (cm, controlp, flags);
2199 } else if (controlp != NULL)
2203 if (controlp != NULL) {
2204 while (*controlp != NULL)
2205 controlp = &(*controlp)->m_next;
2210 KASSERT(m->m_type == MT_DATA, ("soreceive_dgram: !data"));
2212 while (m != NULL && uio->uio_resid > 0) {
2213 len = uio->uio_resid;
2216 error = uiomove(mtod(m, char *), (int)len, uio);
2221 if (len == m->m_len)
2237 soreceive(struct socket *so, struct sockaddr **psa, struct uio *uio,
2238 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2242 CURVNET_SET(so->so_vnet);
2243 error = (so->so_proto->pr_usrreqs->pru_soreceive(so, psa, uio, mp0,
2250 soshutdown(struct socket *so, int how)
2252 struct protosw *pr = so->so_proto;
2255 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
2258 CURVNET_SET(so->so_vnet);
2259 if (pr->pr_usrreqs->pru_flush != NULL)
2260 (*pr->pr_usrreqs->pru_flush)(so, how);
2263 if (how != SHUT_RD) {
2264 error = (*pr->pr_usrreqs->pru_shutdown)(so);
2265 wakeup(&so->so_timeo);
2269 wakeup(&so->so_timeo);
2275 sorflush(struct socket *so)
2277 struct sockbuf *sb = &so->so_rcv;
2278 struct protosw *pr = so->so_proto;
2284 * In order to avoid calling dom_dispose with the socket buffer mutex
2285 * held, and in order to generally avoid holding the lock for a long
2286 * time, we make a copy of the socket buffer and clear the original
2287 * (except locks, state). The new socket buffer copy won't have
2288 * initialized locks so we can only call routines that won't use or
2289 * assert those locks.
2291 * Dislodge threads currently blocked in receive and wait to acquire
2292 * a lock against other simultaneous readers before clearing the
2293 * socket buffer. Don't let our acquire be interrupted by a signal
2294 * despite any existing socket disposition on interruptable waiting.
2297 (void) sblock(sb, SBL_WAIT | SBL_NOINTR);
2300 * Invalidate/clear most of the sockbuf structure, but leave selinfo
2301 * and mutex data unchanged.
2304 bzero(&asb, offsetof(struct sockbuf, sb_startzero));
2305 bcopy(&sb->sb_startzero, &asb.sb_startzero,
2306 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
2307 bzero(&sb->sb_startzero,
2308 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
2313 * Dispose of special rights and flush the socket buffer. Don't call
2314 * any unsafe routines (that rely on locks being initialized) on asb.
2316 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
2317 (*pr->pr_domain->dom_dispose)(asb.sb_mb);
2318 sbrelease_internal(&asb, so);
2322 * Perhaps this routine, and sooptcopyout(), below, ought to come in an
2323 * additional variant to handle the case where the option value needs to be
2324 * some kind of integer, but not a specific size. In addition to their use
2325 * here, these functions are also called by the protocol-level pr_ctloutput()
2329 sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
2334 * If the user gives us more than we wanted, we ignore it, but if we
2335 * don't get the minimum length the caller wants, we return EINVAL.
2336 * On success, sopt->sopt_valsize is set to however much we actually
2339 if ((valsize = sopt->sopt_valsize) < minlen)
2342 sopt->sopt_valsize = valsize = len;
2344 if (sopt->sopt_td != NULL)
2345 return (copyin(sopt->sopt_val, buf, valsize));
2347 bcopy(sopt->sopt_val, buf, valsize);
2352 * Kernel version of setsockopt(2).
2354 * XXX: optlen is size_t, not socklen_t
2357 so_setsockopt(struct socket *so, int level, int optname, void *optval,
2360 struct sockopt sopt;
2362 sopt.sopt_level = level;
2363 sopt.sopt_name = optname;
2364 sopt.sopt_dir = SOPT_SET;
2365 sopt.sopt_val = optval;
2366 sopt.sopt_valsize = optlen;
2367 sopt.sopt_td = NULL;
2368 return (sosetopt(so, &sopt));
2372 sosetopt(struct socket *so, struct sockopt *sopt)
2383 CURVNET_SET(so->so_vnet);
2385 if (sopt->sopt_level != SOL_SOCKET) {
2386 if (so->so_proto->pr_ctloutput != NULL) {
2387 error = (*so->so_proto->pr_ctloutput)(so, sopt);
2391 error = ENOPROTOOPT;
2393 switch (sopt->sopt_name) {
2395 case SO_ACCEPTFILTER:
2396 error = do_setopt_accept_filter(so, sopt);
2402 error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
2407 so->so_linger = l.l_linger;
2409 so->so_options |= SO_LINGER;
2411 so->so_options &= ~SO_LINGER;
2418 case SO_USELOOPBACK:
2428 error = sooptcopyin(sopt, &optval, sizeof optval,
2434 so->so_options |= sopt->sopt_name;
2436 so->so_options &= ~sopt->sopt_name;
2441 error = sooptcopyin(sopt, &optval, sizeof optval,
2446 if (optval < 0 || optval >= rt_numfibs) {
2450 if (((so->so_proto->pr_domain->dom_family == PF_INET) ||
2451 (so->so_proto->pr_domain->dom_family == PF_INET6) ||
2452 (so->so_proto->pr_domain->dom_family == PF_ROUTE)))
2453 so->so_fibnum = optval;
2458 case SO_USER_COOKIE:
2459 error = sooptcopyin(sopt, &val32, sizeof val32,
2463 so->so_user_cookie = val32;
2470 error = sooptcopyin(sopt, &optval, sizeof optval,
2476 * Values < 1 make no sense for any of these options,
2484 switch (sopt->sopt_name) {
2487 if (sbreserve(sopt->sopt_name == SO_SNDBUF ?
2488 &so->so_snd : &so->so_rcv, (u_long)optval,
2489 so, curthread) == 0) {
2493 (sopt->sopt_name == SO_SNDBUF ? &so->so_snd :
2494 &so->so_rcv)->sb_flags &= ~SB_AUTOSIZE;
2498 * Make sure the low-water is never greater than the
2502 SOCKBUF_LOCK(&so->so_snd);
2503 so->so_snd.sb_lowat =
2504 (optval > so->so_snd.sb_hiwat) ?
2505 so->so_snd.sb_hiwat : optval;
2506 SOCKBUF_UNLOCK(&so->so_snd);
2509 SOCKBUF_LOCK(&so->so_rcv);
2510 so->so_rcv.sb_lowat =
2511 (optval > so->so_rcv.sb_hiwat) ?
2512 so->so_rcv.sb_hiwat : optval;
2513 SOCKBUF_UNLOCK(&so->so_rcv);
2520 #ifdef COMPAT_FREEBSD32
2521 if (SV_CURPROC_FLAG(SV_ILP32)) {
2522 struct timeval32 tv32;
2524 error = sooptcopyin(sopt, &tv32, sizeof tv32,
2526 CP(tv32, tv, tv_sec);
2527 CP(tv32, tv, tv_usec);
2530 error = sooptcopyin(sopt, &tv, sizeof tv,
2534 if (tv.tv_sec < 0 || tv.tv_usec < 0 ||
2535 tv.tv_usec >= 1000000) {
2541 switch (sopt->sopt_name) {
2543 so->so_snd.sb_timeo = val;
2546 so->so_rcv.sb_timeo = val;
2553 error = sooptcopyin(sopt, &extmac, sizeof extmac,
2557 error = mac_setsockopt_label(sopt->sopt_td->td_ucred,
2565 error = ENOPROTOOPT;
2568 if (error == 0 && so->so_proto->pr_ctloutput != NULL)
2569 (void)(*so->so_proto->pr_ctloutput)(so, sopt);
2577 * Helper routine for getsockopt.
2580 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
2588 * Documented get behavior is that we always return a value, possibly
2589 * truncated to fit in the user's buffer. Traditional behavior is
2590 * that we always tell the user precisely how much we copied, rather
2591 * than something useful like the total amount we had available for
2592 * her. Note that this interface is not idempotent; the entire
2593 * answer must generated ahead of time.
2595 valsize = min(len, sopt->sopt_valsize);
2596 sopt->sopt_valsize = valsize;
2597 if (sopt->sopt_val != NULL) {
2598 if (sopt->sopt_td != NULL)
2599 error = copyout(buf, sopt->sopt_val, valsize);
2601 bcopy(buf, sopt->sopt_val, valsize);
2607 sogetopt(struct socket *so, struct sockopt *sopt)
2616 CURVNET_SET(so->so_vnet);
2618 if (sopt->sopt_level != SOL_SOCKET) {
2619 if (so->so_proto->pr_ctloutput != NULL)
2620 error = (*so->so_proto->pr_ctloutput)(so, sopt);
2622 error = ENOPROTOOPT;
2626 switch (sopt->sopt_name) {
2628 case SO_ACCEPTFILTER:
2629 error = do_getopt_accept_filter(so, sopt);
2634 l.l_onoff = so->so_options & SO_LINGER;
2635 l.l_linger = so->so_linger;
2637 error = sooptcopyout(sopt, &l, sizeof l);
2640 case SO_USELOOPBACK:
2652 optval = so->so_options & sopt->sopt_name;
2654 error = sooptcopyout(sopt, &optval, sizeof optval);
2658 optval = so->so_type;
2662 optval = so->so_proto->pr_protocol;
2667 optval = so->so_error;
2673 optval = so->so_snd.sb_hiwat;
2677 optval = so->so_rcv.sb_hiwat;
2681 optval = so->so_snd.sb_lowat;
2685 optval = so->so_rcv.sb_lowat;
2690 optval = (sopt->sopt_name == SO_SNDTIMEO ?
2691 so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
2693 tv = sbttotv(optval);
2694 #ifdef COMPAT_FREEBSD32
2695 if (SV_CURPROC_FLAG(SV_ILP32)) {
2696 struct timeval32 tv32;
2698 CP(tv, tv32, tv_sec);
2699 CP(tv, tv32, tv_usec);
2700 error = sooptcopyout(sopt, &tv32, sizeof tv32);
2703 error = sooptcopyout(sopt, &tv, sizeof tv);
2708 error = sooptcopyin(sopt, &extmac, sizeof(extmac),
2712 error = mac_getsockopt_label(sopt->sopt_td->td_ucred,
2716 error = sooptcopyout(sopt, &extmac, sizeof extmac);
2724 error = sooptcopyin(sopt, &extmac, sizeof(extmac),
2728 error = mac_getsockopt_peerlabel(
2729 sopt->sopt_td->td_ucred, so, &extmac);
2732 error = sooptcopyout(sopt, &extmac, sizeof extmac);
2738 case SO_LISTENQLIMIT:
2739 optval = so->so_qlimit;
2743 optval = so->so_qlen;
2746 case SO_LISTENINCQLEN:
2747 optval = so->so_incqlen;
2751 error = ENOPROTOOPT;
2763 soopt_getm(struct sockopt *sopt, struct mbuf **mp)
2765 struct mbuf *m, *m_prev;
2766 int sopt_size = sopt->sopt_valsize;
2768 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
2771 if (sopt_size > MLEN) {
2772 MCLGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT);
2773 if ((m->m_flags & M_EXT) == 0) {
2777 m->m_len = min(MCLBYTES, sopt_size);
2779 m->m_len = min(MLEN, sopt_size);
2781 sopt_size -= m->m_len;
2786 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
2791 if (sopt_size > MLEN) {
2792 MCLGET(m, sopt->sopt_td != NULL ? M_WAITOK :
2794 if ((m->m_flags & M_EXT) == 0) {
2799 m->m_len = min(MCLBYTES, sopt_size);
2801 m->m_len = min(MLEN, sopt_size);
2803 sopt_size -= m->m_len;
2811 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
2813 struct mbuf *m0 = m;
2815 if (sopt->sopt_val == NULL)
2817 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
2818 if (sopt->sopt_td != NULL) {
2821 error = copyin(sopt->sopt_val, mtod(m, char *),
2828 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len);
2829 sopt->sopt_valsize -= m->m_len;
2830 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
2833 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
2834 panic("ip6_sooptmcopyin");
2839 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
2841 struct mbuf *m0 = m;
2844 if (sopt->sopt_val == NULL)
2846 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
2847 if (sopt->sopt_td != NULL) {
2850 error = copyout(mtod(m, char *), sopt->sopt_val,
2857 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len);
2858 sopt->sopt_valsize -= m->m_len;
2859 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
2860 valsize += m->m_len;
2864 /* enough soopt buffer should be given from user-land */
2868 sopt->sopt_valsize = valsize;
2873 * sohasoutofband(): protocol notifies socket layer of the arrival of new
2874 * out-of-band data, which will then notify socket consumers.
2877 sohasoutofband(struct socket *so)
2880 if (so->so_sigio != NULL)
2881 pgsigio(&so->so_sigio, SIGURG, 0);
2882 selwakeuppri(&so->so_rcv.sb_sel, PSOCK);
2886 sopoll(struct socket *so, int events, struct ucred *active_cred,
2891 * We do not need to set or assert curvnet as long as everyone uses
2894 return (so->so_proto->pr_usrreqs->pru_sopoll(so, events, active_cred,
2899 sopoll_generic(struct socket *so, int events, struct ucred *active_cred,
2904 SOCKBUF_LOCK(&so->so_snd);
2905 SOCKBUF_LOCK(&so->so_rcv);
2906 if (events & (POLLIN | POLLRDNORM))
2907 if (soreadabledata(so))
2908 revents |= events & (POLLIN | POLLRDNORM);
2910 if (events & (POLLOUT | POLLWRNORM))
2911 if (sowriteable(so))
2912 revents |= events & (POLLOUT | POLLWRNORM);
2914 if (events & (POLLPRI | POLLRDBAND))
2915 if (so->so_oobmark || (so->so_rcv.sb_state & SBS_RCVATMARK))
2916 revents |= events & (POLLPRI | POLLRDBAND);
2918 if ((events & POLLINIGNEOF) == 0) {
2919 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
2920 revents |= events & (POLLIN | POLLRDNORM);
2921 if (so->so_snd.sb_state & SBS_CANTSENDMORE)
2927 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2928 selrecord(td, &so->so_rcv.sb_sel);
2929 so->so_rcv.sb_flags |= SB_SEL;
2932 if (events & (POLLOUT | POLLWRNORM)) {
2933 selrecord(td, &so->so_snd.sb_sel);
2934 so->so_snd.sb_flags |= SB_SEL;
2938 SOCKBUF_UNLOCK(&so->so_rcv);
2939 SOCKBUF_UNLOCK(&so->so_snd);
2944 soo_kqfilter(struct file *fp, struct knote *kn)
2946 struct socket *so = kn->kn_fp->f_data;
2949 switch (kn->kn_filter) {
2951 if (so->so_options & SO_ACCEPTCONN)
2952 kn->kn_fop = &solisten_filtops;
2954 kn->kn_fop = &soread_filtops;
2958 kn->kn_fop = &sowrite_filtops;
2966 knlist_add(&sb->sb_sel.si_note, kn, 1);
2967 sb->sb_flags |= SB_KNOTE;
2973 * Some routines that return EOPNOTSUPP for entry points that are not
2974 * supported by a protocol. Fill in as needed.
2977 pru_accept_notsupp(struct socket *so, struct sockaddr **nam)
2984 pru_attach_notsupp(struct socket *so, int proto, struct thread *td)
2991 pru_bind_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
2998 pru_bindat_notsupp(int fd, struct socket *so, struct sockaddr *nam,
3006 pru_connect_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
3013 pru_connectat_notsupp(int fd, struct socket *so, struct sockaddr *nam,
3021 pru_connect2_notsupp(struct socket *so1, struct socket *so2)
3028 pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
3029 struct ifnet *ifp, struct thread *td)
3036 pru_disconnect_notsupp(struct socket *so)
3043 pru_listen_notsupp(struct socket *so, int backlog, struct thread *td)
3050 pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam)
3057 pru_rcvd_notsupp(struct socket *so, int flags)
3064 pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags)
3071 pru_send_notsupp(struct socket *so, int flags, struct mbuf *m,
3072 struct sockaddr *addr, struct mbuf *control, struct thread *td)
3079 * This isn't really a ``null'' operation, but it's the default one and
3080 * doesn't do anything destructive.
3083 pru_sense_null(struct socket *so, struct stat *sb)
3086 sb->st_blksize = so->so_snd.sb_hiwat;
3091 pru_shutdown_notsupp(struct socket *so)
3098 pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam)
3105 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
3106 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
3113 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
3114 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
3121 pru_sopoll_notsupp(struct socket *so, int events, struct ucred *cred,
3129 filt_sordetach(struct knote *kn)
3131 struct socket *so = kn->kn_fp->f_data;
3133 SOCKBUF_LOCK(&so->so_rcv);
3134 knlist_remove(&so->so_rcv.sb_sel.si_note, kn, 1);
3135 if (knlist_empty(&so->so_rcv.sb_sel.si_note))
3136 so->so_rcv.sb_flags &= ~SB_KNOTE;
3137 SOCKBUF_UNLOCK(&so->so_rcv);
3142 filt_soread(struct knote *kn, long hint)
3146 so = kn->kn_fp->f_data;
3147 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
3149 kn->kn_data = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
3150 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
3151 kn->kn_flags |= EV_EOF;
3152 kn->kn_fflags = so->so_error;
3154 } else if (so->so_error) /* temporary udp error */
3156 else if (kn->kn_sfflags & NOTE_LOWAT)
3157 return (kn->kn_data >= kn->kn_sdata);
3159 return (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat);
3163 filt_sowdetach(struct knote *kn)
3165 struct socket *so = kn->kn_fp->f_data;
3167 SOCKBUF_LOCK(&so->so_snd);
3168 knlist_remove(&so->so_snd.sb_sel.si_note, kn, 1);
3169 if (knlist_empty(&so->so_snd.sb_sel.si_note))
3170 so->so_snd.sb_flags &= ~SB_KNOTE;
3171 SOCKBUF_UNLOCK(&so->so_snd);
3176 filt_sowrite(struct knote *kn, long hint)
3180 so = kn->kn_fp->f_data;
3181 SOCKBUF_LOCK_ASSERT(&so->so_snd);
3182 kn->kn_data = sbspace(&so->so_snd);
3183 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
3184 kn->kn_flags |= EV_EOF;
3185 kn->kn_fflags = so->so_error;
3187 } else if (so->so_error) /* temporary udp error */
3189 else if (((so->so_state & SS_ISCONNECTED) == 0) &&
3190 (so->so_proto->pr_flags & PR_CONNREQUIRED))
3192 else if (kn->kn_sfflags & NOTE_LOWAT)
3193 return (kn->kn_data >= kn->kn_sdata);
3195 return (kn->kn_data >= so->so_snd.sb_lowat);
3200 filt_solisten(struct knote *kn, long hint)
3202 struct socket *so = kn->kn_fp->f_data;
3204 kn->kn_data = so->so_qlen;
3205 return (!TAILQ_EMPTY(&so->so_comp));
3209 socheckuid(struct socket *so, uid_t uid)
3214 if (so->so_cred->cr_uid != uid)
3220 * These functions are used by protocols to notify the socket layer (and its
3221 * consumers) of state changes in the sockets driven by protocol-side events.
3225 * Procedures to manipulate state flags of socket and do appropriate wakeups.
3227 * Normal sequence from the active (originating) side is that
3228 * soisconnecting() is called during processing of connect() call, resulting
3229 * in an eventual call to soisconnected() if/when the connection is
3230 * established. When the connection is torn down soisdisconnecting() is
3231 * called during processing of disconnect() call, and soisdisconnected() is
3232 * called when the connection to the peer is totally severed. The semantics
3233 * of these routines are such that connectionless protocols can call
3234 * soisconnected() and soisdisconnected() only, bypassing the in-progress
3235 * calls when setting up a ``connection'' takes no time.
3237 * From the passive side, a socket is created with two queues of sockets:
3238 * so_incomp for connections in progress and so_comp for connections already
3239 * made and awaiting user acceptance. As a protocol is preparing incoming
3240 * connections, it creates a socket structure queued on so_incomp by calling
3241 * sonewconn(). When the connection is established, soisconnected() is
3242 * called, and transfers the socket structure to so_comp, making it available
3245 * If a socket is closed with sockets on either so_incomp or so_comp, these
3246 * sockets are dropped.
3248 * If higher-level protocols are implemented in the kernel, the wakeups done
3249 * here will sometimes cause software-interrupt process scheduling.
3252 soisconnecting(struct socket *so)
3256 so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
3257 so->so_state |= SS_ISCONNECTING;
3262 soisconnected(struct socket *so)
3264 struct socket *head;
3270 so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
3271 so->so_state |= SS_ISCONNECTED;
3273 if (head != NULL && (so->so_qstate & SQ_INCOMP)) {
3274 if ((so->so_options & SO_ACCEPTFILTER) == 0) {
3276 TAILQ_REMOVE(&head->so_incomp, so, so_list);
3278 so->so_qstate &= ~SQ_INCOMP;
3279 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
3281 so->so_qstate |= SQ_COMP;
3284 wakeup_one(&head->so_timeo);
3287 soupcall_set(so, SO_RCV,
3288 head->so_accf->so_accept_filter->accf_callback,
3289 head->so_accf->so_accept_filter_arg);
3290 so->so_options &= ~SO_ACCEPTFILTER;
3291 ret = head->so_accf->so_accept_filter->accf_callback(so,
3292 head->so_accf->so_accept_filter_arg, M_NOWAIT);
3293 if (ret == SU_ISCONNECTED)
3294 soupcall_clear(so, SO_RCV);
3296 if (ret == SU_ISCONNECTED)
3303 wakeup(&so->so_timeo);
3309 soisdisconnecting(struct socket *so)
3313 * Note: This code assumes that SOCK_LOCK(so) and
3314 * SOCKBUF_LOCK(&so->so_rcv) are the same.
3316 SOCKBUF_LOCK(&so->so_rcv);
3317 so->so_state &= ~SS_ISCONNECTING;
3318 so->so_state |= SS_ISDISCONNECTING;
3319 so->so_rcv.sb_state |= SBS_CANTRCVMORE;
3320 sorwakeup_locked(so);
3321 SOCKBUF_LOCK(&so->so_snd);
3322 so->so_snd.sb_state |= SBS_CANTSENDMORE;
3323 sowwakeup_locked(so);
3324 wakeup(&so->so_timeo);
3328 soisdisconnected(struct socket *so)
3332 * Note: This code assumes that SOCK_LOCK(so) and
3333 * SOCKBUF_LOCK(&so->so_rcv) are the same.
3335 SOCKBUF_LOCK(&so->so_rcv);
3336 so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
3337 so->so_state |= SS_ISDISCONNECTED;
3338 so->so_rcv.sb_state |= SBS_CANTRCVMORE;
3339 sorwakeup_locked(so);
3340 SOCKBUF_LOCK(&so->so_snd);
3341 so->so_snd.sb_state |= SBS_CANTSENDMORE;
3342 sbdrop_locked(&so->so_snd, so->so_snd.sb_cc);
3343 sowwakeup_locked(so);
3344 wakeup(&so->so_timeo);
3348 * Make a copy of a sockaddr in a malloced buffer of type M_SONAME.
3351 sodupsockaddr(const struct sockaddr *sa, int mflags)
3353 struct sockaddr *sa2;
3355 sa2 = malloc(sa->sa_len, M_SONAME, mflags);
3357 bcopy(sa, sa2, sa->sa_len);
3362 * Register per-socket buffer upcalls.
3365 soupcall_set(struct socket *so, int which,
3366 int (*func)(struct socket *, void *, int), void *arg)
3378 panic("soupcall_set: bad which");
3380 SOCKBUF_LOCK_ASSERT(sb);
3382 /* XXX: accf_http actually wants to do this on purpose. */
3383 KASSERT(sb->sb_upcall == NULL, ("soupcall_set: overwriting upcall"));
3385 sb->sb_upcall = func;
3386 sb->sb_upcallarg = arg;
3387 sb->sb_flags |= SB_UPCALL;
3391 soupcall_clear(struct socket *so, int which)
3403 panic("soupcall_clear: bad which");
3405 SOCKBUF_LOCK_ASSERT(sb);
3406 KASSERT(sb->sb_upcall != NULL, ("soupcall_clear: no upcall to clear"));
3407 sb->sb_upcall = NULL;
3408 sb->sb_upcallarg = NULL;
3409 sb->sb_flags &= ~SB_UPCALL;
3413 * Create an external-format (``xsocket'') structure using the information in
3414 * the kernel-format socket structure pointed to by so. This is done to
3415 * reduce the spew of irrelevant information over this interface, to isolate
3416 * user code from changes in the kernel structure, and potentially to provide
3417 * information-hiding if we decide that some of this information should be
3418 * hidden from users.
3421 sotoxsocket(struct socket *so, struct xsocket *xso)
3424 xso->xso_len = sizeof *xso;
3426 xso->so_type = so->so_type;
3427 xso->so_options = so->so_options;
3428 xso->so_linger = so->so_linger;
3429 xso->so_state = so->so_state;
3430 xso->so_pcb = so->so_pcb;
3431 xso->xso_protocol = so->so_proto->pr_protocol;
3432 xso->xso_family = so->so_proto->pr_domain->dom_family;
3433 xso->so_qlen = so->so_qlen;
3434 xso->so_incqlen = so->so_incqlen;
3435 xso->so_qlimit = so->so_qlimit;
3436 xso->so_timeo = so->so_timeo;
3437 xso->so_error = so->so_error;
3438 xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
3439 xso->so_oobmark = so->so_oobmark;
3440 sbtoxsockbuf(&so->so_snd, &xso->so_snd);
3441 sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
3442 xso->so_uid = so->so_cred->cr_uid;
3447 * Socket accessor functions to provide external consumers with
3448 * a safe interface to socket state
3453 so_listeners_apply_all(struct socket *so, void (*func)(struct socket *, void *),
3457 TAILQ_FOREACH(so, &so->so_comp, so_list)
3462 so_sockbuf_rcv(struct socket *so)
3465 return (&so->so_rcv);
3469 so_sockbuf_snd(struct socket *so)
3472 return (&so->so_snd);
3476 so_state_get(const struct socket *so)
3479 return (so->so_state);
3483 so_state_set(struct socket *so, int val)
3490 so_options_get(const struct socket *so)
3493 return (so->so_options);
3497 so_options_set(struct socket *so, int val)
3500 so->so_options = val;
3504 so_error_get(const struct socket *so)
3507 return (so->so_error);
3511 so_error_set(struct socket *so, int val)
3518 so_linger_get(const struct socket *so)
3521 return (so->so_linger);
3525 so_linger_set(struct socket *so, int val)
3528 so->so_linger = val;
3532 so_protosw_get(const struct socket *so)
3535 return (so->so_proto);
3539 so_protosw_set(struct socket *so, struct protosw *val)
3546 so_sorwakeup(struct socket *so)
3553 so_sowwakeup(struct socket *so)
3560 so_sorwakeup_locked(struct socket *so)
3563 sorwakeup_locked(so);
3567 so_sowwakeup_locked(struct socket *so)
3570 sowwakeup_locked(so);
3574 so_lock(struct socket *so)
3581 so_unlock(struct socket *so)