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 SS_ISCONFIRMING, or SS_ISCONNECTED.
484 * Note: the ref count on the socket is 0 on return.
487 sonewconn(struct socket *head, int connstatus)
489 static struct timeval lastover;
490 static struct timeval overinterval = { 60, 0 };
491 static int overcount;
497 over = (head->so_qlen > 3 * head->so_qlimit / 2);
500 if (regression_sonewconn_earlytest && over) {
506 if (ratecheck(&lastover, &overinterval)) {
507 log(LOG_DEBUG, "%s: pcb %p: Listen queue overflow: "
508 "%i already in queue awaiting acceptance "
509 "(%d occurrences)\n",
510 __func__, head->so_pcb, head->so_qlen, overcount);
517 VNET_ASSERT(head->so_vnet != NULL, ("%s:%d so_vnet is NULL, head=%p",
518 __func__, __LINE__, head));
519 so = soalloc(head->so_vnet);
521 log(LOG_DEBUG, "%s: pcb %p: New socket allocation failure: "
522 "limit reached or out of memory\n",
523 __func__, head->so_pcb);
526 if ((head->so_options & SO_ACCEPTFILTER) != 0)
529 so->so_type = head->so_type;
530 so->so_options = head->so_options &~ SO_ACCEPTCONN;
531 so->so_linger = head->so_linger;
532 so->so_state = head->so_state | SS_NOFDREF;
533 so->so_fibnum = head->so_fibnum;
534 so->so_proto = head->so_proto;
535 so->so_cred = crhold(head->so_cred);
537 mac_socket_newconn(head, so);
539 knlist_init_mtx(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv));
540 knlist_init_mtx(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd));
541 VNET_SO_ASSERT(head);
542 if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat)) {
544 log(LOG_DEBUG, "%s: pcb %p: soreserve() failed\n",
545 __func__, head->so_pcb);
548 if ((*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
550 log(LOG_DEBUG, "%s: pcb %p: pru_attach() failed\n",
551 __func__, head->so_pcb);
554 so->so_rcv.sb_lowat = head->so_rcv.sb_lowat;
555 so->so_snd.sb_lowat = head->so_snd.sb_lowat;
556 so->so_rcv.sb_timeo = head->so_rcv.sb_timeo;
557 so->so_snd.sb_timeo = head->so_snd.sb_timeo;
558 so->so_rcv.sb_flags |= head->so_rcv.sb_flags & SB_AUTOSIZE;
559 so->so_snd.sb_flags |= head->so_snd.sb_flags & SB_AUTOSIZE;
560 so->so_state |= connstatus;
563 * The accept socket may be tearing down but we just
564 * won a race on the ACCEPT_LOCK.
565 * However, if sctp_peeloff() is called on a 1-to-many
566 * style socket, the SO_ACCEPTCONN doesn't need to be set.
568 if (!(head->so_options & SO_ACCEPTCONN) &&
569 ((head->so_proto->pr_protocol != IPPROTO_SCTP) ||
570 (head->so_type != SOCK_SEQPACKET))) {
573 sofree(so); /* NB: returns ACCEPT_UNLOCK'ed. */
577 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
578 so->so_qstate |= SQ_COMP;
582 * Keep removing sockets from the head until there's room for
583 * us to insert on the tail. In pre-locking revisions, this
584 * was a simple if(), but as we could be racing with other
585 * threads and soabort() requires dropping locks, we must
586 * loop waiting for the condition to be true.
588 while (head->so_incqlen > head->so_qlimit) {
590 sp = TAILQ_FIRST(&head->so_incomp);
591 TAILQ_REMOVE(&head->so_incomp, sp, so_list);
593 sp->so_qstate &= ~SQ_INCOMP;
599 TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
600 so->so_qstate |= SQ_INCOMP;
606 wakeup_one(&head->so_timeo);
612 sobind(struct socket *so, struct sockaddr *nam, struct thread *td)
616 CURVNET_SET(so->so_vnet);
617 error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td);
623 sobindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
627 CURVNET_SET(so->so_vnet);
628 error = (*so->so_proto->pr_usrreqs->pru_bindat)(fd, so, nam, td);
634 * solisten() transitions a socket from a non-listening state to a listening
635 * state, but can also be used to update the listen queue depth on an
636 * existing listen socket. The protocol will call back into the sockets
637 * layer using solisten_proto_check() and solisten_proto() to check and set
638 * socket-layer listen state. Call backs are used so that the protocol can
639 * acquire both protocol and socket layer locks in whatever order is required
642 * Protocol implementors are advised to hold the socket lock across the
643 * socket-layer test and set to avoid races at the socket layer.
646 solisten(struct socket *so, int backlog, struct thread *td)
650 CURVNET_SET(so->so_vnet);
651 error = (*so->so_proto->pr_usrreqs->pru_listen)(so, backlog, td);
657 solisten_proto_check(struct socket *so)
660 SOCK_LOCK_ASSERT(so);
662 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
669 solisten_proto(struct socket *so, int backlog)
672 SOCK_LOCK_ASSERT(so);
674 if (backlog < 0 || backlog > somaxconn)
676 so->so_qlimit = backlog;
677 so->so_options |= SO_ACCEPTCONN;
681 * Evaluate the reference count and named references on a socket; if no
682 * references remain, free it. This should be called whenever a reference is
683 * released, such as in sorele(), but also when named reference flags are
684 * cleared in socket or protocol code.
686 * sofree() will free the socket if:
688 * - There are no outstanding file descriptor references or related consumers
691 * - The socket has been closed by user space, if ever open (SS_NOFDREF).
693 * - The protocol does not have an outstanding strong reference on the socket
696 * - The socket is not in a completed connection queue, so a process has been
697 * notified that it is present. If it is removed, the user process may
698 * block in accept() despite select() saying the socket was ready.
701 sofree(struct socket *so)
703 struct protosw *pr = so->so_proto;
706 ACCEPT_LOCK_ASSERT();
707 SOCK_LOCK_ASSERT(so);
709 if ((so->so_state & SS_NOFDREF) == 0 || so->so_count != 0 ||
710 (so->so_state & SS_PROTOREF) || (so->so_qstate & SQ_COMP)) {
718 KASSERT((so->so_qstate & SQ_COMP) != 0 ||
719 (so->so_qstate & SQ_INCOMP) != 0,
720 ("sofree: so_head != NULL, but neither SQ_COMP nor "
722 KASSERT((so->so_qstate & SQ_COMP) == 0 ||
723 (so->so_qstate & SQ_INCOMP) == 0,
724 ("sofree: so->so_qstate is SQ_COMP and also SQ_INCOMP"));
725 TAILQ_REMOVE(&head->so_incomp, so, so_list);
727 so->so_qstate &= ~SQ_INCOMP;
730 KASSERT((so->so_qstate & SQ_COMP) == 0 &&
731 (so->so_qstate & SQ_INCOMP) == 0,
732 ("sofree: so_head == NULL, but still SQ_COMP(%d) or SQ_INCOMP(%d)",
733 so->so_qstate & SQ_COMP, so->so_qstate & SQ_INCOMP));
734 if (so->so_options & SO_ACCEPTCONN) {
735 KASSERT((TAILQ_EMPTY(&so->so_comp)),
736 ("sofree: so_comp populated"));
737 KASSERT((TAILQ_EMPTY(&so->so_incomp)),
738 ("sofree: so_incomp populated"));
744 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
745 (*pr->pr_domain->dom_dispose)(so->so_rcv.sb_mb);
746 if (pr->pr_usrreqs->pru_detach != NULL)
747 (*pr->pr_usrreqs->pru_detach)(so);
750 * From this point on, we assume that no other references to this
751 * socket exist anywhere else in the stack. Therefore, no locks need
752 * to be acquired or held.
754 * We used to do a lot of socket buffer and socket locking here, as
755 * well as invoke sorflush() and perform wakeups. The direct call to
756 * dom_dispose() and sbrelease_internal() are an inlining of what was
757 * necessary from sorflush().
759 * Notice that the socket buffer and kqueue state are torn down
760 * before calling pru_detach. This means that protocols shold not
761 * assume they can perform socket wakeups, etc, in their detach code.
763 sbdestroy(&so->so_snd, so);
764 sbdestroy(&so->so_rcv, so);
765 seldrain(&so->so_snd.sb_sel);
766 seldrain(&so->so_rcv.sb_sel);
767 knlist_destroy(&so->so_rcv.sb_sel.si_note);
768 knlist_destroy(&so->so_snd.sb_sel.si_note);
773 * Close a socket on last file table reference removal. Initiate disconnect
774 * if connected. Free socket when disconnect complete.
776 * This function will sorele() the socket. Note that soclose() may be called
777 * prior to the ref count reaching zero. The actual socket structure will
778 * not be freed until the ref count reaches zero.
781 soclose(struct socket *so)
785 KASSERT(!(so->so_state & SS_NOFDREF), ("soclose: SS_NOFDREF on enter"));
787 CURVNET_SET(so->so_vnet);
788 funsetown(&so->so_sigio);
789 if (so->so_state & SS_ISCONNECTED) {
790 if ((so->so_state & SS_ISDISCONNECTING) == 0) {
791 error = sodisconnect(so);
793 if (error == ENOTCONN)
798 if (so->so_options & SO_LINGER) {
799 if ((so->so_state & SS_ISDISCONNECTING) &&
800 (so->so_state & SS_NBIO))
802 while (so->so_state & SS_ISCONNECTED) {
803 error = tsleep(&so->so_timeo,
804 PSOCK | PCATCH, "soclos",
813 if (so->so_proto->pr_usrreqs->pru_close != NULL)
814 (*so->so_proto->pr_usrreqs->pru_close)(so);
816 if (so->so_options & SO_ACCEPTCONN) {
819 * Prevent new additions to the accept queues due
820 * to ACCEPT_LOCK races while we are draining them.
822 so->so_options &= ~SO_ACCEPTCONN;
823 while ((sp = TAILQ_FIRST(&so->so_incomp)) != NULL) {
824 TAILQ_REMOVE(&so->so_incomp, sp, so_list);
826 sp->so_qstate &= ~SQ_INCOMP;
832 while ((sp = TAILQ_FIRST(&so->so_comp)) != NULL) {
833 TAILQ_REMOVE(&so->so_comp, sp, so_list);
835 sp->so_qstate &= ~SQ_COMP;
841 KASSERT((TAILQ_EMPTY(&so->so_comp)),
842 ("%s: so_comp populated", __func__));
843 KASSERT((TAILQ_EMPTY(&so->so_incomp)),
844 ("%s: so_incomp populated", __func__));
847 KASSERT((so->so_state & SS_NOFDREF) == 0, ("soclose: NOFDREF"));
848 so->so_state |= SS_NOFDREF;
849 sorele(so); /* NB: Returns with ACCEPT_UNLOCK(). */
855 * soabort() is used to abruptly tear down a connection, such as when a
856 * resource limit is reached (listen queue depth exceeded), or if a listen
857 * socket is closed while there are sockets waiting to be accepted.
859 * This interface is tricky, because it is called on an unreferenced socket,
860 * and must be called only by a thread that has actually removed the socket
861 * from the listen queue it was on, or races with other threads are risked.
863 * This interface will call into the protocol code, so must not be called
864 * with any socket locks held. Protocols do call it while holding their own
865 * recursible protocol mutexes, but this is something that should be subject
866 * to review in the future.
869 soabort(struct socket *so)
873 * In as much as is possible, assert that no references to this
874 * socket are held. This is not quite the same as asserting that the
875 * current thread is responsible for arranging for no references, but
876 * is as close as we can get for now.
878 KASSERT(so->so_count == 0, ("soabort: so_count"));
879 KASSERT((so->so_state & SS_PROTOREF) == 0, ("soabort: SS_PROTOREF"));
880 KASSERT(so->so_state & SS_NOFDREF, ("soabort: !SS_NOFDREF"));
881 KASSERT((so->so_state & SQ_COMP) == 0, ("soabort: SQ_COMP"));
882 KASSERT((so->so_state & SQ_INCOMP) == 0, ("soabort: SQ_INCOMP"));
885 if (so->so_proto->pr_usrreqs->pru_abort != NULL)
886 (*so->so_proto->pr_usrreqs->pru_abort)(so);
893 soaccept(struct socket *so, struct sockaddr **nam)
898 KASSERT((so->so_state & SS_NOFDREF) != 0, ("soaccept: !NOFDREF"));
899 so->so_state &= ~SS_NOFDREF;
902 CURVNET_SET(so->so_vnet);
903 error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam);
909 soconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
912 return (soconnectat(AT_FDCWD, so, nam, td));
916 soconnectat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
920 if (so->so_options & SO_ACCEPTCONN)
923 CURVNET_SET(so->so_vnet);
925 * If protocol is connection-based, can only connect once.
926 * Otherwise, if connected, try to disconnect first. This allows
927 * user to disconnect by connecting to, e.g., a null address.
929 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
930 ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
931 (error = sodisconnect(so)))) {
935 * Prevent accumulated error from previous connection from
939 if (fd == AT_FDCWD) {
940 error = (*so->so_proto->pr_usrreqs->pru_connect)(so,
943 error = (*so->so_proto->pr_usrreqs->pru_connectat)(fd,
953 soconnect2(struct socket *so1, struct socket *so2)
957 CURVNET_SET(so1->so_vnet);
958 error = (*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2);
964 sodisconnect(struct socket *so)
968 if ((so->so_state & SS_ISCONNECTED) == 0)
970 if (so->so_state & SS_ISDISCONNECTING)
973 error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so);
977 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? 0 : SBL_WAIT)
980 sosend_dgram(struct socket *so, struct sockaddr *addr, struct uio *uio,
981 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
985 int clen = 0, error, dontroute;
987 KASSERT(so->so_type == SOCK_DGRAM, ("sosend_dgram: !SOCK_DGRAM"));
988 KASSERT(so->so_proto->pr_flags & PR_ATOMIC,
989 ("sosend_dgram: !PR_ATOMIC"));
992 resid = uio->uio_resid;
994 resid = top->m_pkthdr.len;
996 * In theory resid should be unsigned. However, space must be
997 * signed, as it might be less than 0 if we over-committed, and we
998 * must use a signed comparison of space and resid. On the other
999 * hand, a negative resid causes us to loop sending 0-length
1000 * segments to the protocol.
1008 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0;
1010 td->td_ru.ru_msgsnd++;
1011 if (control != NULL)
1012 clen = control->m_len;
1014 SOCKBUF_LOCK(&so->so_snd);
1015 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1016 SOCKBUF_UNLOCK(&so->so_snd);
1021 error = so->so_error;
1023 SOCKBUF_UNLOCK(&so->so_snd);
1026 if ((so->so_state & SS_ISCONNECTED) == 0) {
1028 * `sendto' and `sendmsg' is allowed on a connection-based
1029 * socket if it supports implied connect. Return ENOTCONN if
1030 * not connected and no address is supplied.
1032 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1033 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1034 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1035 !(resid == 0 && clen != 0)) {
1036 SOCKBUF_UNLOCK(&so->so_snd);
1040 } else if (addr == NULL) {
1041 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1044 error = EDESTADDRREQ;
1045 SOCKBUF_UNLOCK(&so->so_snd);
1051 * Do we need MSG_OOB support in SOCK_DGRAM? Signs here may be a
1052 * problem and need fixing.
1054 space = sbspace(&so->so_snd);
1055 if (flags & MSG_OOB)
1058 SOCKBUF_UNLOCK(&so->so_snd);
1059 if (resid > space) {
1065 if (flags & MSG_EOR)
1066 top->m_flags |= M_EOR;
1069 * Copy the data from userland into a mbuf chain.
1070 * If no data is to be copied in, a single empty mbuf
1073 top = m_uiotombuf(uio, M_WAITOK, space, max_hdr,
1074 (M_PKTHDR | ((flags & MSG_EOR) ? M_EOR : 0)));
1076 error = EFAULT; /* only possible error */
1079 space -= resid - uio->uio_resid;
1080 resid = uio->uio_resid;
1082 KASSERT(resid == 0, ("sosend_dgram: resid != 0"));
1084 * XXXRW: Frobbing SO_DONTROUTE here is even worse without sblock
1089 so->so_options |= SO_DONTROUTE;
1093 * XXX all the SBS_CANTSENDMORE checks previously done could be out
1094 * of date. We could have recieved a reset packet in an interrupt or
1095 * maybe we slept while doing page faults in uiomove() etc. We could
1096 * probably recheck again inside the locking protection here, but
1097 * there are probably other places that this also happens. We must
1101 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1102 (flags & MSG_OOB) ? PRUS_OOB :
1104 * If the user set MSG_EOF, the protocol understands this flag and
1105 * nothing left to send then use PRU_SEND_EOF instead of PRU_SEND.
1107 ((flags & MSG_EOF) &&
1108 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1111 /* If there is more to send set PRUS_MORETOCOME */
1112 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1113 top, addr, control, td);
1116 so->so_options &= ~SO_DONTROUTE;
1125 if (control != NULL)
1131 * Send on a socket. If send must go all at once and message is larger than
1132 * send buffering, then hard error. Lock against other senders. If must go
1133 * all at once and not enough room now, then inform user that this would
1134 * block and do nothing. Otherwise, if nonblocking, send as much as
1135 * possible. The data to be sent is described by "uio" if nonzero, otherwise
1136 * by the mbuf chain "top" (which must be null if uio is not). Data provided
1137 * in mbuf chain must be small enough to send all at once.
1139 * Returns nonzero on error, timeout or signal; callers must check for short
1140 * counts if EINTR/ERESTART are returned. Data and control buffers are freed
1144 sosend_generic(struct socket *so, struct sockaddr *addr, struct uio *uio,
1145 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1149 int clen = 0, error, dontroute;
1150 int atomic = sosendallatonce(so) || top;
1153 resid = uio->uio_resid;
1155 resid = top->m_pkthdr.len;
1157 * In theory resid should be unsigned. However, space must be
1158 * signed, as it might be less than 0 if we over-committed, and we
1159 * must use a signed comparison of space and resid. On the other
1160 * hand, a negative resid causes us to loop sending 0-length
1161 * segments to the protocol.
1163 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
1164 * type sockets since that's an error.
1166 if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
1172 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
1173 (so->so_proto->pr_flags & PR_ATOMIC);
1175 td->td_ru.ru_msgsnd++;
1176 if (control != NULL)
1177 clen = control->m_len;
1179 error = sblock(&so->so_snd, SBLOCKWAIT(flags));
1185 SOCKBUF_LOCK(&so->so_snd);
1186 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1187 SOCKBUF_UNLOCK(&so->so_snd);
1192 error = so->so_error;
1194 SOCKBUF_UNLOCK(&so->so_snd);
1197 if ((so->so_state & SS_ISCONNECTED) == 0) {
1199 * `sendto' and `sendmsg' is allowed on a connection-
1200 * based socket if it supports implied connect.
1201 * Return ENOTCONN if not connected and no address is
1204 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1205 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1206 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1207 !(resid == 0 && clen != 0)) {
1208 SOCKBUF_UNLOCK(&so->so_snd);
1212 } else if (addr == NULL) {
1213 SOCKBUF_UNLOCK(&so->so_snd);
1214 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1217 error = EDESTADDRREQ;
1221 space = sbspace(&so->so_snd);
1222 if (flags & MSG_OOB)
1224 if ((atomic && resid > so->so_snd.sb_hiwat) ||
1225 clen > so->so_snd.sb_hiwat) {
1226 SOCKBUF_UNLOCK(&so->so_snd);
1230 if (space < resid + clen &&
1231 (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1232 if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1233 SOCKBUF_UNLOCK(&so->so_snd);
1234 error = EWOULDBLOCK;
1237 error = sbwait(&so->so_snd);
1238 SOCKBUF_UNLOCK(&so->so_snd);
1243 SOCKBUF_UNLOCK(&so->so_snd);
1248 if (flags & MSG_EOR)
1249 top->m_flags |= M_EOR;
1252 * Copy the data from userland into a mbuf
1253 * chain. If no data is to be copied in,
1254 * a single empty mbuf is returned.
1256 top = m_uiotombuf(uio, M_WAITOK, space,
1257 (atomic ? max_hdr : 0),
1258 (atomic ? M_PKTHDR : 0) |
1259 ((flags & MSG_EOR) ? M_EOR : 0));
1261 error = EFAULT; /* only possible error */
1264 space -= resid - uio->uio_resid;
1265 resid = uio->uio_resid;
1269 so->so_options |= SO_DONTROUTE;
1273 * XXX all the SBS_CANTSENDMORE checks previously
1274 * done could be out of date. We could have recieved
1275 * a reset packet in an interrupt or maybe we slept
1276 * while doing page faults in uiomove() etc. We
1277 * could probably recheck again inside the locking
1278 * protection here, but there are probably other
1279 * places that this also happens. We must rethink
1283 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1284 (flags & MSG_OOB) ? PRUS_OOB :
1286 * If the user set MSG_EOF, the protocol understands
1287 * this flag and nothing left to send then use
1288 * PRU_SEND_EOF instead of PRU_SEND.
1290 ((flags & MSG_EOF) &&
1291 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1294 /* If there is more to send set PRUS_MORETOCOME. */
1295 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1296 top, addr, control, td);
1299 so->so_options &= ~SO_DONTROUTE;
1307 } while (resid && space > 0);
1311 sbunlock(&so->so_snd);
1315 if (control != NULL)
1321 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
1322 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1326 CURVNET_SET(so->so_vnet);
1327 error = so->so_proto->pr_usrreqs->pru_sosend(so, addr, uio, top,
1328 control, flags, td);
1334 * The part of soreceive() that implements reading non-inline out-of-band
1335 * data from a socket. For more complete comments, see soreceive(), from
1336 * which this code originated.
1338 * Note that soreceive_rcvoob(), unlike the remainder of soreceive(), is
1339 * unable to return an mbuf chain to the caller.
1342 soreceive_rcvoob(struct socket *so, struct uio *uio, int flags)
1344 struct protosw *pr = so->so_proto;
1348 KASSERT(flags & MSG_OOB, ("soreceive_rcvoob: (flags & MSG_OOB) == 0"));
1351 m = m_get(M_WAITOK, MT_DATA);
1352 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK);
1356 error = uiomove(mtod(m, void *),
1357 (int) min(uio->uio_resid, m->m_len), uio);
1359 } while (uio->uio_resid && error == 0 && m);
1367 * Following replacement or removal of the first mbuf on the first mbuf chain
1368 * of a socket buffer, push necessary state changes back into the socket
1369 * buffer so that other consumers see the values consistently. 'nextrecord'
1370 * is the callers locally stored value of the original value of
1371 * sb->sb_mb->m_nextpkt which must be restored when the lead mbuf changes.
1372 * NOTE: 'nextrecord' may be NULL.
1374 static __inline void
1375 sockbuf_pushsync(struct sockbuf *sb, struct mbuf *nextrecord)
1378 SOCKBUF_LOCK_ASSERT(sb);
1380 * First, update for the new value of nextrecord. If necessary, make
1381 * it the first record.
1383 if (sb->sb_mb != NULL)
1384 sb->sb_mb->m_nextpkt = nextrecord;
1386 sb->sb_mb = nextrecord;
1389 * Now update any dependent socket buffer fields to reflect the new
1390 * state. This is an expanded inline of SB_EMPTY_FIXUP(), with the
1391 * addition of a second clause that takes care of the case where
1392 * sb_mb has been updated, but remains the last record.
1394 if (sb->sb_mb == NULL) {
1395 sb->sb_mbtail = NULL;
1396 sb->sb_lastrecord = NULL;
1397 } else if (sb->sb_mb->m_nextpkt == NULL)
1398 sb->sb_lastrecord = sb->sb_mb;
1402 * Implement receive operations on a socket. We depend on the way that
1403 * records are added to the sockbuf by sbappend. In particular, each record
1404 * (mbufs linked through m_next) must begin with an address if the protocol
1405 * so specifies, followed by an optional mbuf or mbufs containing ancillary
1406 * data, and then zero or more mbufs of data. In order to allow parallelism
1407 * between network receive and copying to user space, as well as avoid
1408 * sleeping with a mutex held, we release the socket buffer mutex during the
1409 * user space copy. Although the sockbuf is locked, new data may still be
1410 * appended, and thus we must maintain consistency of the sockbuf during that
1413 * The caller may receive the data as a single mbuf chain by supplying an
1414 * mbuf **mp0 for use in returning the chain. The uio is then used only for
1415 * the count in uio_resid.
1418 soreceive_generic(struct socket *so, struct sockaddr **psa, struct uio *uio,
1419 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1421 struct mbuf *m, **mp;
1422 int flags, error, offset;
1424 struct protosw *pr = so->so_proto;
1425 struct mbuf *nextrecord;
1427 ssize_t orig_resid = uio->uio_resid;
1432 if (controlp != NULL)
1435 flags = *flagsp &~ MSG_EOR;
1438 if (flags & MSG_OOB)
1439 return (soreceive_rcvoob(so, uio, flags));
1442 if ((pr->pr_flags & PR_WANTRCVD) && (so->so_state & SS_ISCONFIRMING)
1443 && uio->uio_resid) {
1445 (*pr->pr_usrreqs->pru_rcvd)(so, 0);
1448 error = sblock(&so->so_rcv, SBLOCKWAIT(flags));
1453 SOCKBUF_LOCK(&so->so_rcv);
1454 m = so->so_rcv.sb_mb;
1456 * If we have less data than requested, block awaiting more (subject
1457 * to any timeout) if:
1458 * 1. the current count is less than the low water mark, or
1459 * 2. MSG_DONTWAIT is not set
1461 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
1462 so->so_rcv.sb_cc < uio->uio_resid) &&
1463 so->so_rcv.sb_cc < so->so_rcv.sb_lowat &&
1464 m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) {
1465 KASSERT(m != NULL || !so->so_rcv.sb_cc,
1466 ("receive: m == %p so->so_rcv.sb_cc == %u",
1467 m, so->so_rcv.sb_cc));
1471 error = so->so_error;
1472 if ((flags & MSG_PEEK) == 0)
1474 SOCKBUF_UNLOCK(&so->so_rcv);
1477 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1478 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
1480 SOCKBUF_UNLOCK(&so->so_rcv);
1485 for (; m != NULL; m = m->m_next)
1486 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1487 m = so->so_rcv.sb_mb;
1490 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1491 (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1492 SOCKBUF_UNLOCK(&so->so_rcv);
1496 if (uio->uio_resid == 0) {
1497 SOCKBUF_UNLOCK(&so->so_rcv);
1500 if ((so->so_state & SS_NBIO) ||
1501 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1502 SOCKBUF_UNLOCK(&so->so_rcv);
1503 error = EWOULDBLOCK;
1506 SBLASTRECORDCHK(&so->so_rcv);
1507 SBLASTMBUFCHK(&so->so_rcv);
1508 error = sbwait(&so->so_rcv);
1509 SOCKBUF_UNLOCK(&so->so_rcv);
1516 * From this point onward, we maintain 'nextrecord' as a cache of the
1517 * pointer to the next record in the socket buffer. We must keep the
1518 * various socket buffer pointers and local stack versions of the
1519 * pointers in sync, pushing out modifications before dropping the
1520 * socket buffer mutex, and re-reading them when picking it up.
1522 * Otherwise, we will race with the network stack appending new data
1523 * or records onto the socket buffer by using inconsistent/stale
1524 * versions of the field, possibly resulting in socket buffer
1527 * By holding the high-level sblock(), we prevent simultaneous
1528 * readers from pulling off the front of the socket buffer.
1530 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1532 uio->uio_td->td_ru.ru_msgrcv++;
1533 KASSERT(m == so->so_rcv.sb_mb, ("soreceive: m != so->so_rcv.sb_mb"));
1534 SBLASTRECORDCHK(&so->so_rcv);
1535 SBLASTMBUFCHK(&so->so_rcv);
1536 nextrecord = m->m_nextpkt;
1537 if (pr->pr_flags & PR_ADDR) {
1538 KASSERT(m->m_type == MT_SONAME,
1539 ("m->m_type == %d", m->m_type));
1542 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
1544 if (flags & MSG_PEEK) {
1547 sbfree(&so->so_rcv, m);
1548 so->so_rcv.sb_mb = m_free(m);
1549 m = so->so_rcv.sb_mb;
1550 sockbuf_pushsync(&so->so_rcv, nextrecord);
1555 * Process one or more MT_CONTROL mbufs present before any data mbufs
1556 * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1557 * just copy the data; if !MSG_PEEK, we call into the protocol to
1558 * perform externalization (or freeing if controlp == NULL).
1560 if (m != NULL && m->m_type == MT_CONTROL) {
1561 struct mbuf *cm = NULL, *cmn;
1562 struct mbuf **cme = &cm;
1565 if (flags & MSG_PEEK) {
1566 if (controlp != NULL) {
1567 *controlp = m_copy(m, 0, m->m_len);
1568 controlp = &(*controlp)->m_next;
1572 sbfree(&so->so_rcv, m);
1573 so->so_rcv.sb_mb = m->m_next;
1576 cme = &(*cme)->m_next;
1577 m = so->so_rcv.sb_mb;
1579 } while (m != NULL && m->m_type == MT_CONTROL);
1580 if ((flags & MSG_PEEK) == 0)
1581 sockbuf_pushsync(&so->so_rcv, nextrecord);
1582 while (cm != NULL) {
1585 if (pr->pr_domain->dom_externalize != NULL) {
1586 SOCKBUF_UNLOCK(&so->so_rcv);
1588 error = (*pr->pr_domain->dom_externalize)
1589 (cm, controlp, flags);
1590 SOCKBUF_LOCK(&so->so_rcv);
1591 } else if (controlp != NULL)
1595 if (controlp != NULL) {
1597 while (*controlp != NULL)
1598 controlp = &(*controlp)->m_next;
1603 nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1605 nextrecord = so->so_rcv.sb_mb;
1609 if ((flags & MSG_PEEK) == 0) {
1610 KASSERT(m->m_nextpkt == nextrecord,
1611 ("soreceive: post-control, nextrecord !sync"));
1612 if (nextrecord == NULL) {
1613 KASSERT(so->so_rcv.sb_mb == m,
1614 ("soreceive: post-control, sb_mb!=m"));
1615 KASSERT(so->so_rcv.sb_lastrecord == m,
1616 ("soreceive: post-control, lastrecord!=m"));
1620 if (type == MT_OOBDATA)
1623 if ((flags & MSG_PEEK) == 0) {
1624 KASSERT(so->so_rcv.sb_mb == nextrecord,
1625 ("soreceive: sb_mb != nextrecord"));
1626 if (so->so_rcv.sb_mb == NULL) {
1627 KASSERT(so->so_rcv.sb_lastrecord == NULL,
1628 ("soreceive: sb_lastercord != NULL"));
1632 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1633 SBLASTRECORDCHK(&so->so_rcv);
1634 SBLASTMBUFCHK(&so->so_rcv);
1637 * Now continue to read any data mbufs off of the head of the socket
1638 * buffer until the read request is satisfied. Note that 'type' is
1639 * used to store the type of any mbuf reads that have happened so far
1640 * such that soreceive() can stop reading if the type changes, which
1641 * causes soreceive() to return only one of regular data and inline
1642 * out-of-band data in a single socket receive operation.
1646 while (m != NULL && uio->uio_resid > 0 && error == 0) {
1648 * If the type of mbuf has changed since the last mbuf
1649 * examined ('type'), end the receive operation.
1651 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1652 if (m->m_type == MT_OOBDATA || m->m_type == MT_CONTROL) {
1653 if (type != m->m_type)
1655 } else if (type == MT_OOBDATA)
1658 KASSERT(m->m_type == MT_DATA,
1659 ("m->m_type == %d", m->m_type));
1660 so->so_rcv.sb_state &= ~SBS_RCVATMARK;
1661 len = uio->uio_resid;
1662 if (so->so_oobmark && len > so->so_oobmark - offset)
1663 len = so->so_oobmark - offset;
1664 if (len > m->m_len - moff)
1665 len = m->m_len - moff;
1667 * If mp is set, just pass back the mbufs. Otherwise copy
1668 * them out via the uio, then free. Sockbuf must be
1669 * consistent here (points to current mbuf, it points to next
1670 * record) when we drop priority; we must note any additions
1671 * to the sockbuf when we block interrupts again.
1674 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1675 SBLASTRECORDCHK(&so->so_rcv);
1676 SBLASTMBUFCHK(&so->so_rcv);
1677 SOCKBUF_UNLOCK(&so->so_rcv);
1678 error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1679 SOCKBUF_LOCK(&so->so_rcv);
1682 * The MT_SONAME mbuf has already been removed
1683 * from the record, so it is necessary to
1684 * remove the data mbufs, if any, to preserve
1685 * the invariant in the case of PR_ADDR that
1686 * requires MT_SONAME mbufs at the head of
1689 if (m && pr->pr_flags & PR_ATOMIC &&
1690 ((flags & MSG_PEEK) == 0))
1691 (void)sbdroprecord_locked(&so->so_rcv);
1692 SOCKBUF_UNLOCK(&so->so_rcv);
1696 uio->uio_resid -= len;
1697 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1698 if (len == m->m_len - moff) {
1699 if (m->m_flags & M_EOR)
1701 if (flags & MSG_PEEK) {
1705 nextrecord = m->m_nextpkt;
1706 sbfree(&so->so_rcv, m);
1708 m->m_nextpkt = NULL;
1711 so->so_rcv.sb_mb = m = m->m_next;
1714 so->so_rcv.sb_mb = m_free(m);
1715 m = so->so_rcv.sb_mb;
1717 sockbuf_pushsync(&so->so_rcv, nextrecord);
1718 SBLASTRECORDCHK(&so->so_rcv);
1719 SBLASTMBUFCHK(&so->so_rcv);
1722 if (flags & MSG_PEEK)
1726 if (flags & MSG_DONTWAIT) {
1727 *mp = m_copym(m, 0, len,
1731 * m_copym() couldn't
1733 * Adjust uio_resid back
1735 * down by len bytes,
1736 * which we didn't end
1737 * up "copying" over).
1739 uio->uio_resid += len;
1743 SOCKBUF_UNLOCK(&so->so_rcv);
1744 *mp = m_copym(m, 0, len,
1746 SOCKBUF_LOCK(&so->so_rcv);
1751 so->so_rcv.sb_cc -= len;
1754 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1755 if (so->so_oobmark) {
1756 if ((flags & MSG_PEEK) == 0) {
1757 so->so_oobmark -= len;
1758 if (so->so_oobmark == 0) {
1759 so->so_rcv.sb_state |= SBS_RCVATMARK;
1764 if (offset == so->so_oobmark)
1768 if (flags & MSG_EOR)
1771 * If the MSG_WAITALL flag is set (for non-atomic socket), we
1772 * must not quit until "uio->uio_resid == 0" or an error
1773 * termination. If a signal/timeout occurs, return with a
1774 * short count but without error. Keep sockbuf locked
1775 * against other readers.
1777 while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1778 !sosendallatonce(so) && nextrecord == NULL) {
1779 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1781 so->so_rcv.sb_state & SBS_CANTRCVMORE)
1784 * Notify the protocol that some data has been
1785 * drained before blocking.
1787 if (pr->pr_flags & PR_WANTRCVD) {
1788 SOCKBUF_UNLOCK(&so->so_rcv);
1790 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
1791 SOCKBUF_LOCK(&so->so_rcv);
1793 SBLASTRECORDCHK(&so->so_rcv);
1794 SBLASTMBUFCHK(&so->so_rcv);
1796 * We could receive some data while was notifying
1797 * the protocol. Skip blocking in this case.
1799 if (so->so_rcv.sb_mb == NULL) {
1800 error = sbwait(&so->so_rcv);
1802 SOCKBUF_UNLOCK(&so->so_rcv);
1806 m = so->so_rcv.sb_mb;
1808 nextrecord = m->m_nextpkt;
1812 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1813 if (m != NULL && pr->pr_flags & PR_ATOMIC) {
1815 if ((flags & MSG_PEEK) == 0)
1816 (void) sbdroprecord_locked(&so->so_rcv);
1818 if ((flags & MSG_PEEK) == 0) {
1821 * First part is an inline SB_EMPTY_FIXUP(). Second
1822 * part makes sure sb_lastrecord is up-to-date if
1823 * there is still data in the socket buffer.
1825 so->so_rcv.sb_mb = nextrecord;
1826 if (so->so_rcv.sb_mb == NULL) {
1827 so->so_rcv.sb_mbtail = NULL;
1828 so->so_rcv.sb_lastrecord = NULL;
1829 } else if (nextrecord->m_nextpkt == NULL)
1830 so->so_rcv.sb_lastrecord = nextrecord;
1832 SBLASTRECORDCHK(&so->so_rcv);
1833 SBLASTMBUFCHK(&so->so_rcv);
1835 * If soreceive() is being done from the socket callback,
1836 * then don't need to generate ACK to peer to update window,
1837 * since ACK will be generated on return to TCP.
1839 if (!(flags & MSG_SOCALLBCK) &&
1840 (pr->pr_flags & PR_WANTRCVD)) {
1841 SOCKBUF_UNLOCK(&so->so_rcv);
1843 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
1844 SOCKBUF_LOCK(&so->so_rcv);
1847 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1848 if (orig_resid == uio->uio_resid && orig_resid &&
1849 (flags & MSG_EOR) == 0 && (so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0) {
1850 SOCKBUF_UNLOCK(&so->so_rcv);
1853 SOCKBUF_UNLOCK(&so->so_rcv);
1858 sbunlock(&so->so_rcv);
1863 * Optimized version of soreceive() for stream (TCP) sockets.
1864 * XXXAO: (MSG_WAITALL | MSG_PEEK) isn't properly handled.
1867 soreceive_stream(struct socket *so, struct sockaddr **psa, struct uio *uio,
1868 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1870 int len = 0, error = 0, flags, oresid;
1872 struct mbuf *m, *n = NULL;
1874 /* We only do stream sockets. */
1875 if (so->so_type != SOCK_STREAM)
1879 if (controlp != NULL)
1882 flags = *flagsp &~ MSG_EOR;
1885 if (flags & MSG_OOB)
1886 return (soreceive_rcvoob(so, uio, flags));
1892 /* Prevent other readers from entering the socket. */
1893 error = sblock(sb, SBLOCKWAIT(flags));
1898 /* Easy one, no space to copyout anything. */
1899 if (uio->uio_resid == 0) {
1903 oresid = uio->uio_resid;
1905 /* We will never ever get anything unless we are or were connected. */
1906 if (!(so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED))) {
1912 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1914 /* Abort if socket has reported problems. */
1918 if (oresid > uio->uio_resid)
1920 error = so->so_error;
1921 if (!(flags & MSG_PEEK))
1926 /* Door is closed. Deliver what is left, if any. */
1927 if (sb->sb_state & SBS_CANTRCVMORE) {
1934 /* Socket buffer is empty and we shall not block. */
1935 if (sb->sb_cc == 0 &&
1936 ((so->so_state & SS_NBIO) || (flags & (MSG_DONTWAIT|MSG_NBIO)))) {
1941 /* Socket buffer got some data that we shall deliver now. */
1942 if (sb->sb_cc > 0 && !(flags & MSG_WAITALL) &&
1943 ((sb->sb_flags & SS_NBIO) ||
1944 (flags & (MSG_DONTWAIT|MSG_NBIO)) ||
1945 sb->sb_cc >= sb->sb_lowat ||
1946 sb->sb_cc >= uio->uio_resid ||
1947 sb->sb_cc >= sb->sb_hiwat) ) {
1951 /* On MSG_WAITALL we must wait until all data or error arrives. */
1952 if ((flags & MSG_WAITALL) &&
1953 (sb->sb_cc >= uio->uio_resid || sb->sb_cc >= sb->sb_hiwat))
1957 * Wait and block until (more) data comes in.
1958 * NB: Drops the sockbuf lock during wait.
1966 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1967 KASSERT(sb->sb_cc > 0, ("%s: sockbuf empty", __func__));
1968 KASSERT(sb->sb_mb != NULL, ("%s: sb_mb == NULL", __func__));
1972 uio->uio_td->td_ru.ru_msgrcv++;
1974 /* Fill uio until full or current end of socket buffer is reached. */
1975 len = min(uio->uio_resid, sb->sb_cc);
1977 /* Dequeue as many mbufs as possible. */
1978 if (!(flags & MSG_PEEK) && len >= sb->sb_mb->m_len) {
1982 m_cat(*mp0, sb->sb_mb);
1984 m != NULL && m->m_len <= len;
1987 uio->uio_resid -= m->m_len;
1993 sb->sb_lastrecord = sb->sb_mb;
1994 if (sb->sb_mb == NULL)
1997 /* Copy the remainder. */
1999 KASSERT(sb->sb_mb != NULL,
2000 ("%s: len > 0 && sb->sb_mb empty", __func__));
2002 m = m_copym(sb->sb_mb, 0, len, M_NOWAIT);
2004 len = 0; /* Don't flush data from sockbuf. */
2006 uio->uio_resid -= len;
2017 /* NB: Must unlock socket buffer as uiomove may sleep. */
2019 error = m_mbuftouio(uio, sb->sb_mb, len);
2024 SBLASTRECORDCHK(sb);
2028 * Remove the delivered data from the socket buffer unless we
2029 * were only peeking.
2031 if (!(flags & MSG_PEEK)) {
2033 sbdrop_locked(sb, len);
2035 /* Notify protocol that we drained some data. */
2036 if ((so->so_proto->pr_flags & PR_WANTRCVD) &&
2037 (((flags & MSG_WAITALL) && uio->uio_resid > 0) ||
2038 !(flags & MSG_SOCALLBCK))) {
2041 (*so->so_proto->pr_usrreqs->pru_rcvd)(so, flags);
2047 * For MSG_WAITALL we may have to loop again and wait for
2048 * more data to come in.
2050 if ((flags & MSG_WAITALL) && uio->uio_resid > 0)
2053 SOCKBUF_LOCK_ASSERT(sb);
2054 SBLASTRECORDCHK(sb);
2062 * Optimized version of soreceive() for simple datagram cases from userspace.
2063 * Unlike in the stream case, we're able to drop a datagram if copyout()
2064 * fails, and because we handle datagrams atomically, we don't need to use a
2065 * sleep lock to prevent I/O interlacing.
2068 soreceive_dgram(struct socket *so, struct sockaddr **psa, struct uio *uio,
2069 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2071 struct mbuf *m, *m2;
2074 struct protosw *pr = so->so_proto;
2075 struct mbuf *nextrecord;
2079 if (controlp != NULL)
2082 flags = *flagsp &~ MSG_EOR;
2087 * For any complicated cases, fall back to the full
2088 * soreceive_generic().
2090 if (mp0 != NULL || (flags & MSG_PEEK) || (flags & MSG_OOB))
2091 return (soreceive_generic(so, psa, uio, mp0, controlp,
2095 * Enforce restrictions on use.
2097 KASSERT((pr->pr_flags & PR_WANTRCVD) == 0,
2098 ("soreceive_dgram: wantrcvd"));
2099 KASSERT(pr->pr_flags & PR_ATOMIC, ("soreceive_dgram: !atomic"));
2100 KASSERT((so->so_rcv.sb_state & SBS_RCVATMARK) == 0,
2101 ("soreceive_dgram: SBS_RCVATMARK"));
2102 KASSERT((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0,
2103 ("soreceive_dgram: P_CONNREQUIRED"));
2106 * Loop blocking while waiting for a datagram.
2108 SOCKBUF_LOCK(&so->so_rcv);
2109 while ((m = so->so_rcv.sb_mb) == NULL) {
2110 KASSERT(so->so_rcv.sb_cc == 0,
2111 ("soreceive_dgram: sb_mb NULL but sb_cc %u",
2114 error = so->so_error;
2116 SOCKBUF_UNLOCK(&so->so_rcv);
2119 if (so->so_rcv.sb_state & SBS_CANTRCVMORE ||
2120 uio->uio_resid == 0) {
2121 SOCKBUF_UNLOCK(&so->so_rcv);
2124 if ((so->so_state & SS_NBIO) ||
2125 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
2126 SOCKBUF_UNLOCK(&so->so_rcv);
2127 return (EWOULDBLOCK);
2129 SBLASTRECORDCHK(&so->so_rcv);
2130 SBLASTMBUFCHK(&so->so_rcv);
2131 error = sbwait(&so->so_rcv);
2133 SOCKBUF_UNLOCK(&so->so_rcv);
2137 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2140 uio->uio_td->td_ru.ru_msgrcv++;
2141 SBLASTRECORDCHK(&so->so_rcv);
2142 SBLASTMBUFCHK(&so->so_rcv);
2143 nextrecord = m->m_nextpkt;
2144 if (nextrecord == NULL) {
2145 KASSERT(so->so_rcv.sb_lastrecord == m,
2146 ("soreceive_dgram: lastrecord != m"));
2149 KASSERT(so->so_rcv.sb_mb->m_nextpkt == nextrecord,
2150 ("soreceive_dgram: m_nextpkt != nextrecord"));
2153 * Pull 'm' and its chain off the front of the packet queue.
2155 so->so_rcv.sb_mb = NULL;
2156 sockbuf_pushsync(&so->so_rcv, nextrecord);
2159 * Walk 'm's chain and free that many bytes from the socket buffer.
2161 for (m2 = m; m2 != NULL; m2 = m2->m_next)
2162 sbfree(&so->so_rcv, m2);
2165 * Do a few last checks before we let go of the lock.
2167 SBLASTRECORDCHK(&so->so_rcv);
2168 SBLASTMBUFCHK(&so->so_rcv);
2169 SOCKBUF_UNLOCK(&so->so_rcv);
2171 if (pr->pr_flags & PR_ADDR) {
2172 KASSERT(m->m_type == MT_SONAME,
2173 ("m->m_type == %d", m->m_type));
2175 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
2180 /* XXXRW: Can this happen? */
2185 * Packet to copyout() is now in 'm' and it is disconnected from the
2188 * Process one or more MT_CONTROL mbufs present before any data mbufs
2189 * in the first mbuf chain on the socket buffer. We call into the
2190 * protocol to perform externalization (or freeing if controlp ==
2193 if (m->m_type == MT_CONTROL) {
2194 struct mbuf *cm = NULL, *cmn;
2195 struct mbuf **cme = &cm;
2201 cme = &(*cme)->m_next;
2203 } while (m != NULL && m->m_type == MT_CONTROL);
2204 while (cm != NULL) {
2207 if (pr->pr_domain->dom_externalize != NULL) {
2208 error = (*pr->pr_domain->dom_externalize)
2209 (cm, controlp, flags);
2210 } else if (controlp != NULL)
2214 if (controlp != NULL) {
2215 while (*controlp != NULL)
2216 controlp = &(*controlp)->m_next;
2221 KASSERT(m->m_type == MT_DATA, ("soreceive_dgram: !data"));
2223 while (m != NULL && uio->uio_resid > 0) {
2224 len = uio->uio_resid;
2227 error = uiomove(mtod(m, char *), (int)len, uio);
2232 if (len == m->m_len)
2248 soreceive(struct socket *so, struct sockaddr **psa, struct uio *uio,
2249 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2253 CURVNET_SET(so->so_vnet);
2254 error = (so->so_proto->pr_usrreqs->pru_soreceive(so, psa, uio, mp0,
2261 soshutdown(struct socket *so, int how)
2263 struct protosw *pr = so->so_proto;
2266 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
2269 CURVNET_SET(so->so_vnet);
2270 if (pr->pr_usrreqs->pru_flush != NULL)
2271 (*pr->pr_usrreqs->pru_flush)(so, how);
2274 if (how != SHUT_RD) {
2275 error = (*pr->pr_usrreqs->pru_shutdown)(so);
2276 wakeup(&so->so_timeo);
2280 wakeup(&so->so_timeo);
2286 sorflush(struct socket *so)
2288 struct sockbuf *sb = &so->so_rcv;
2289 struct protosw *pr = so->so_proto;
2295 * In order to avoid calling dom_dispose with the socket buffer mutex
2296 * held, and in order to generally avoid holding the lock for a long
2297 * time, we make a copy of the socket buffer and clear the original
2298 * (except locks, state). The new socket buffer copy won't have
2299 * initialized locks so we can only call routines that won't use or
2300 * assert those locks.
2302 * Dislodge threads currently blocked in receive and wait to acquire
2303 * a lock against other simultaneous readers before clearing the
2304 * socket buffer. Don't let our acquire be interrupted by a signal
2305 * despite any existing socket disposition on interruptable waiting.
2308 (void) sblock(sb, SBL_WAIT | SBL_NOINTR);
2311 * Invalidate/clear most of the sockbuf structure, but leave selinfo
2312 * and mutex data unchanged.
2315 bzero(&asb, offsetof(struct sockbuf, sb_startzero));
2316 bcopy(&sb->sb_startzero, &asb.sb_startzero,
2317 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
2318 bzero(&sb->sb_startzero,
2319 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
2324 * Dispose of special rights and flush the socket buffer. Don't call
2325 * any unsafe routines (that rely on locks being initialized) on asb.
2327 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
2328 (*pr->pr_domain->dom_dispose)(asb.sb_mb);
2329 sbrelease_internal(&asb, so);
2333 * Perhaps this routine, and sooptcopyout(), below, ought to come in an
2334 * additional variant to handle the case where the option value needs to be
2335 * some kind of integer, but not a specific size. In addition to their use
2336 * here, these functions are also called by the protocol-level pr_ctloutput()
2340 sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
2345 * If the user gives us more than we wanted, we ignore it, but if we
2346 * don't get the minimum length the caller wants, we return EINVAL.
2347 * On success, sopt->sopt_valsize is set to however much we actually
2350 if ((valsize = sopt->sopt_valsize) < minlen)
2353 sopt->sopt_valsize = valsize = len;
2355 if (sopt->sopt_td != NULL)
2356 return (copyin(sopt->sopt_val, buf, valsize));
2358 bcopy(sopt->sopt_val, buf, valsize);
2363 * Kernel version of setsockopt(2).
2365 * XXX: optlen is size_t, not socklen_t
2368 so_setsockopt(struct socket *so, int level, int optname, void *optval,
2371 struct sockopt sopt;
2373 sopt.sopt_level = level;
2374 sopt.sopt_name = optname;
2375 sopt.sopt_dir = SOPT_SET;
2376 sopt.sopt_val = optval;
2377 sopt.sopt_valsize = optlen;
2378 sopt.sopt_td = NULL;
2379 return (sosetopt(so, &sopt));
2383 sosetopt(struct socket *so, struct sockopt *sopt)
2394 CURVNET_SET(so->so_vnet);
2396 if (sopt->sopt_level != SOL_SOCKET) {
2397 if (so->so_proto->pr_ctloutput != NULL) {
2398 error = (*so->so_proto->pr_ctloutput)(so, sopt);
2402 error = ENOPROTOOPT;
2404 switch (sopt->sopt_name) {
2406 case SO_ACCEPTFILTER:
2407 error = do_setopt_accept_filter(so, sopt);
2413 error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
2418 so->so_linger = l.l_linger;
2420 so->so_options |= SO_LINGER;
2422 so->so_options &= ~SO_LINGER;
2429 case SO_USELOOPBACK:
2439 error = sooptcopyin(sopt, &optval, sizeof optval,
2445 so->so_options |= sopt->sopt_name;
2447 so->so_options &= ~sopt->sopt_name;
2452 error = sooptcopyin(sopt, &optval, sizeof optval,
2457 if (optval < 0 || optval >= rt_numfibs) {
2461 if (((so->so_proto->pr_domain->dom_family == PF_INET) ||
2462 (so->so_proto->pr_domain->dom_family == PF_INET6) ||
2463 (so->so_proto->pr_domain->dom_family == PF_ROUTE)))
2464 so->so_fibnum = optval;
2469 case SO_USER_COOKIE:
2470 error = sooptcopyin(sopt, &val32, sizeof val32,
2474 so->so_user_cookie = val32;
2481 error = sooptcopyin(sopt, &optval, sizeof optval,
2487 * Values < 1 make no sense for any of these options,
2495 switch (sopt->sopt_name) {
2498 if (sbreserve(sopt->sopt_name == SO_SNDBUF ?
2499 &so->so_snd : &so->so_rcv, (u_long)optval,
2500 so, curthread) == 0) {
2504 (sopt->sopt_name == SO_SNDBUF ? &so->so_snd :
2505 &so->so_rcv)->sb_flags &= ~SB_AUTOSIZE;
2509 * Make sure the low-water is never greater than the
2513 SOCKBUF_LOCK(&so->so_snd);
2514 so->so_snd.sb_lowat =
2515 (optval > so->so_snd.sb_hiwat) ?
2516 so->so_snd.sb_hiwat : optval;
2517 SOCKBUF_UNLOCK(&so->so_snd);
2520 SOCKBUF_LOCK(&so->so_rcv);
2521 so->so_rcv.sb_lowat =
2522 (optval > so->so_rcv.sb_hiwat) ?
2523 so->so_rcv.sb_hiwat : optval;
2524 SOCKBUF_UNLOCK(&so->so_rcv);
2531 #ifdef COMPAT_FREEBSD32
2532 if (SV_CURPROC_FLAG(SV_ILP32)) {
2533 struct timeval32 tv32;
2535 error = sooptcopyin(sopt, &tv32, sizeof tv32,
2537 CP(tv32, tv, tv_sec);
2538 CP(tv32, tv, tv_usec);
2541 error = sooptcopyin(sopt, &tv, sizeof tv,
2545 if (tv.tv_sec < 0 || tv.tv_usec < 0 ||
2546 tv.tv_usec >= 1000000) {
2552 switch (sopt->sopt_name) {
2554 so->so_snd.sb_timeo = val;
2557 so->so_rcv.sb_timeo = val;
2564 error = sooptcopyin(sopt, &extmac, sizeof extmac,
2568 error = mac_setsockopt_label(sopt->sopt_td->td_ucred,
2576 error = ENOPROTOOPT;
2579 if (error == 0 && so->so_proto->pr_ctloutput != NULL)
2580 (void)(*so->so_proto->pr_ctloutput)(so, sopt);
2588 * Helper routine for getsockopt.
2591 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
2599 * Documented get behavior is that we always return a value, possibly
2600 * truncated to fit in the user's buffer. Traditional behavior is
2601 * that we always tell the user precisely how much we copied, rather
2602 * than something useful like the total amount we had available for
2603 * her. Note that this interface is not idempotent; the entire
2604 * answer must generated ahead of time.
2606 valsize = min(len, sopt->sopt_valsize);
2607 sopt->sopt_valsize = valsize;
2608 if (sopt->sopt_val != NULL) {
2609 if (sopt->sopt_td != NULL)
2610 error = copyout(buf, sopt->sopt_val, valsize);
2612 bcopy(buf, sopt->sopt_val, valsize);
2618 sogetopt(struct socket *so, struct sockopt *sopt)
2627 CURVNET_SET(so->so_vnet);
2629 if (sopt->sopt_level != SOL_SOCKET) {
2630 if (so->so_proto->pr_ctloutput != NULL)
2631 error = (*so->so_proto->pr_ctloutput)(so, sopt);
2633 error = ENOPROTOOPT;
2637 switch (sopt->sopt_name) {
2639 case SO_ACCEPTFILTER:
2640 error = do_getopt_accept_filter(so, sopt);
2645 l.l_onoff = so->so_options & SO_LINGER;
2646 l.l_linger = so->so_linger;
2648 error = sooptcopyout(sopt, &l, sizeof l);
2651 case SO_USELOOPBACK:
2663 optval = so->so_options & sopt->sopt_name;
2665 error = sooptcopyout(sopt, &optval, sizeof optval);
2669 optval = so->so_type;
2673 optval = so->so_proto->pr_protocol;
2678 optval = so->so_error;
2684 optval = so->so_snd.sb_hiwat;
2688 optval = so->so_rcv.sb_hiwat;
2692 optval = so->so_snd.sb_lowat;
2696 optval = so->so_rcv.sb_lowat;
2701 optval = (sopt->sopt_name == SO_SNDTIMEO ?
2702 so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
2704 tv = sbttotv(optval);
2705 #ifdef COMPAT_FREEBSD32
2706 if (SV_CURPROC_FLAG(SV_ILP32)) {
2707 struct timeval32 tv32;
2709 CP(tv, tv32, tv_sec);
2710 CP(tv, tv32, tv_usec);
2711 error = sooptcopyout(sopt, &tv32, sizeof tv32);
2714 error = sooptcopyout(sopt, &tv, sizeof tv);
2719 error = sooptcopyin(sopt, &extmac, sizeof(extmac),
2723 error = mac_getsockopt_label(sopt->sopt_td->td_ucred,
2727 error = sooptcopyout(sopt, &extmac, sizeof extmac);
2735 error = sooptcopyin(sopt, &extmac, sizeof(extmac),
2739 error = mac_getsockopt_peerlabel(
2740 sopt->sopt_td->td_ucred, so, &extmac);
2743 error = sooptcopyout(sopt, &extmac, sizeof extmac);
2749 case SO_LISTENQLIMIT:
2750 optval = so->so_qlimit;
2754 optval = so->so_qlen;
2757 case SO_LISTENINCQLEN:
2758 optval = so->so_incqlen;
2762 error = ENOPROTOOPT;
2774 soopt_getm(struct sockopt *sopt, struct mbuf **mp)
2776 struct mbuf *m, *m_prev;
2777 int sopt_size = sopt->sopt_valsize;
2779 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
2782 if (sopt_size > MLEN) {
2783 MCLGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT);
2784 if ((m->m_flags & M_EXT) == 0) {
2788 m->m_len = min(MCLBYTES, sopt_size);
2790 m->m_len = min(MLEN, sopt_size);
2792 sopt_size -= m->m_len;
2797 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
2802 if (sopt_size > MLEN) {
2803 MCLGET(m, sopt->sopt_td != NULL ? M_WAITOK :
2805 if ((m->m_flags & M_EXT) == 0) {
2810 m->m_len = min(MCLBYTES, sopt_size);
2812 m->m_len = min(MLEN, sopt_size);
2814 sopt_size -= m->m_len;
2822 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
2824 struct mbuf *m0 = m;
2826 if (sopt->sopt_val == NULL)
2828 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
2829 if (sopt->sopt_td != NULL) {
2832 error = copyin(sopt->sopt_val, mtod(m, char *),
2839 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len);
2840 sopt->sopt_valsize -= m->m_len;
2841 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
2844 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
2845 panic("ip6_sooptmcopyin");
2850 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
2852 struct mbuf *m0 = m;
2855 if (sopt->sopt_val == NULL)
2857 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
2858 if (sopt->sopt_td != NULL) {
2861 error = copyout(mtod(m, char *), sopt->sopt_val,
2868 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len);
2869 sopt->sopt_valsize -= m->m_len;
2870 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
2871 valsize += m->m_len;
2875 /* enough soopt buffer should be given from user-land */
2879 sopt->sopt_valsize = valsize;
2884 * sohasoutofband(): protocol notifies socket layer of the arrival of new
2885 * out-of-band data, which will then notify socket consumers.
2888 sohasoutofband(struct socket *so)
2891 if (so->so_sigio != NULL)
2892 pgsigio(&so->so_sigio, SIGURG, 0);
2893 selwakeuppri(&so->so_rcv.sb_sel, PSOCK);
2897 sopoll(struct socket *so, int events, struct ucred *active_cred,
2902 * We do not need to set or assert curvnet as long as everyone uses
2905 return (so->so_proto->pr_usrreqs->pru_sopoll(so, events, active_cred,
2910 sopoll_generic(struct socket *so, int events, struct ucred *active_cred,
2915 SOCKBUF_LOCK(&so->so_snd);
2916 SOCKBUF_LOCK(&so->so_rcv);
2917 if (events & (POLLIN | POLLRDNORM))
2918 if (soreadabledata(so))
2919 revents |= events & (POLLIN | POLLRDNORM);
2921 if (events & (POLLOUT | POLLWRNORM))
2922 if (sowriteable(so))
2923 revents |= events & (POLLOUT | POLLWRNORM);
2925 if (events & (POLLPRI | POLLRDBAND))
2926 if (so->so_oobmark || (so->so_rcv.sb_state & SBS_RCVATMARK))
2927 revents |= events & (POLLPRI | POLLRDBAND);
2929 if ((events & POLLINIGNEOF) == 0) {
2930 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
2931 revents |= events & (POLLIN | POLLRDNORM);
2932 if (so->so_snd.sb_state & SBS_CANTSENDMORE)
2938 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2939 selrecord(td, &so->so_rcv.sb_sel);
2940 so->so_rcv.sb_flags |= SB_SEL;
2943 if (events & (POLLOUT | POLLWRNORM)) {
2944 selrecord(td, &so->so_snd.sb_sel);
2945 so->so_snd.sb_flags |= SB_SEL;
2949 SOCKBUF_UNLOCK(&so->so_rcv);
2950 SOCKBUF_UNLOCK(&so->so_snd);
2955 soo_kqfilter(struct file *fp, struct knote *kn)
2957 struct socket *so = kn->kn_fp->f_data;
2960 switch (kn->kn_filter) {
2962 if (so->so_options & SO_ACCEPTCONN)
2963 kn->kn_fop = &solisten_filtops;
2965 kn->kn_fop = &soread_filtops;
2969 kn->kn_fop = &sowrite_filtops;
2977 knlist_add(&sb->sb_sel.si_note, kn, 1);
2978 sb->sb_flags |= SB_KNOTE;
2984 * Some routines that return EOPNOTSUPP for entry points that are not
2985 * supported by a protocol. Fill in as needed.
2988 pru_accept_notsupp(struct socket *so, struct sockaddr **nam)
2995 pru_attach_notsupp(struct socket *so, int proto, struct thread *td)
3002 pru_bind_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
3009 pru_bindat_notsupp(int fd, struct socket *so, struct sockaddr *nam,
3017 pru_connect_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
3024 pru_connectat_notsupp(int fd, struct socket *so, struct sockaddr *nam,
3032 pru_connect2_notsupp(struct socket *so1, struct socket *so2)
3039 pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
3040 struct ifnet *ifp, struct thread *td)
3047 pru_disconnect_notsupp(struct socket *so)
3054 pru_listen_notsupp(struct socket *so, int backlog, struct thread *td)
3061 pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam)
3068 pru_rcvd_notsupp(struct socket *so, int flags)
3075 pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags)
3082 pru_send_notsupp(struct socket *so, int flags, struct mbuf *m,
3083 struct sockaddr *addr, struct mbuf *control, struct thread *td)
3090 * This isn't really a ``null'' operation, but it's the default one and
3091 * doesn't do anything destructive.
3094 pru_sense_null(struct socket *so, struct stat *sb)
3097 sb->st_blksize = so->so_snd.sb_hiwat;
3102 pru_shutdown_notsupp(struct socket *so)
3109 pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam)
3116 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
3117 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
3124 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
3125 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
3132 pru_sopoll_notsupp(struct socket *so, int events, struct ucred *cred,
3140 filt_sordetach(struct knote *kn)
3142 struct socket *so = kn->kn_fp->f_data;
3144 SOCKBUF_LOCK(&so->so_rcv);
3145 knlist_remove(&so->so_rcv.sb_sel.si_note, kn, 1);
3146 if (knlist_empty(&so->so_rcv.sb_sel.si_note))
3147 so->so_rcv.sb_flags &= ~SB_KNOTE;
3148 SOCKBUF_UNLOCK(&so->so_rcv);
3153 filt_soread(struct knote *kn, long hint)
3157 so = kn->kn_fp->f_data;
3158 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
3160 kn->kn_data = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
3161 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
3162 kn->kn_flags |= EV_EOF;
3163 kn->kn_fflags = so->so_error;
3165 } else if (so->so_error) /* temporary udp error */
3167 else if (kn->kn_sfflags & NOTE_LOWAT)
3168 return (kn->kn_data >= kn->kn_sdata);
3170 return (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat);
3174 filt_sowdetach(struct knote *kn)
3176 struct socket *so = kn->kn_fp->f_data;
3178 SOCKBUF_LOCK(&so->so_snd);
3179 knlist_remove(&so->so_snd.sb_sel.si_note, kn, 1);
3180 if (knlist_empty(&so->so_snd.sb_sel.si_note))
3181 so->so_snd.sb_flags &= ~SB_KNOTE;
3182 SOCKBUF_UNLOCK(&so->so_snd);
3187 filt_sowrite(struct knote *kn, long hint)
3191 so = kn->kn_fp->f_data;
3192 SOCKBUF_LOCK_ASSERT(&so->so_snd);
3193 kn->kn_data = sbspace(&so->so_snd);
3194 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
3195 kn->kn_flags |= EV_EOF;
3196 kn->kn_fflags = so->so_error;
3198 } else if (so->so_error) /* temporary udp error */
3200 else if (((so->so_state & SS_ISCONNECTED) == 0) &&
3201 (so->so_proto->pr_flags & PR_CONNREQUIRED))
3203 else if (kn->kn_sfflags & NOTE_LOWAT)
3204 return (kn->kn_data >= kn->kn_sdata);
3206 return (kn->kn_data >= so->so_snd.sb_lowat);
3211 filt_solisten(struct knote *kn, long hint)
3213 struct socket *so = kn->kn_fp->f_data;
3215 kn->kn_data = so->so_qlen;
3216 return (!TAILQ_EMPTY(&so->so_comp));
3220 socheckuid(struct socket *so, uid_t uid)
3225 if (so->so_cred->cr_uid != uid)
3231 * These functions are used by protocols to notify the socket layer (and its
3232 * consumers) of state changes in the sockets driven by protocol-side events.
3236 * Procedures to manipulate state flags of socket and do appropriate wakeups.
3238 * Normal sequence from the active (originating) side is that
3239 * soisconnecting() is called during processing of connect() call, resulting
3240 * in an eventual call to soisconnected() if/when the connection is
3241 * established. When the connection is torn down soisdisconnecting() is
3242 * called during processing of disconnect() call, and soisdisconnected() is
3243 * called when the connection to the peer is totally severed. The semantics
3244 * of these routines are such that connectionless protocols can call
3245 * soisconnected() and soisdisconnected() only, bypassing the in-progress
3246 * calls when setting up a ``connection'' takes no time.
3248 * From the passive side, a socket is created with two queues of sockets:
3249 * so_incomp for connections in progress and so_comp for connections already
3250 * made and awaiting user acceptance. As a protocol is preparing incoming
3251 * connections, it creates a socket structure queued on so_incomp by calling
3252 * sonewconn(). When the connection is established, soisconnected() is
3253 * called, and transfers the socket structure to so_comp, making it available
3256 * If a socket is closed with sockets on either so_incomp or so_comp, these
3257 * sockets are dropped.
3259 * If higher-level protocols are implemented in the kernel, the wakeups done
3260 * here will sometimes cause software-interrupt process scheduling.
3263 soisconnecting(struct socket *so)
3267 so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
3268 so->so_state |= SS_ISCONNECTING;
3273 soisconnected(struct socket *so)
3275 struct socket *head;
3281 so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
3282 so->so_state |= SS_ISCONNECTED;
3284 if (head != NULL && (so->so_qstate & SQ_INCOMP)) {
3285 if ((so->so_options & SO_ACCEPTFILTER) == 0) {
3287 TAILQ_REMOVE(&head->so_incomp, so, so_list);
3289 so->so_qstate &= ~SQ_INCOMP;
3290 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
3292 so->so_qstate |= SQ_COMP;
3295 wakeup_one(&head->so_timeo);
3298 soupcall_set(so, SO_RCV,
3299 head->so_accf->so_accept_filter->accf_callback,
3300 head->so_accf->so_accept_filter_arg);
3301 so->so_options &= ~SO_ACCEPTFILTER;
3302 ret = head->so_accf->so_accept_filter->accf_callback(so,
3303 head->so_accf->so_accept_filter_arg, M_NOWAIT);
3304 if (ret == SU_ISCONNECTED)
3305 soupcall_clear(so, SO_RCV);
3307 if (ret == SU_ISCONNECTED)
3314 wakeup(&so->so_timeo);
3320 soisdisconnecting(struct socket *so)
3324 * Note: This code assumes that SOCK_LOCK(so) and
3325 * SOCKBUF_LOCK(&so->so_rcv) are the same.
3327 SOCKBUF_LOCK(&so->so_rcv);
3328 so->so_state &= ~SS_ISCONNECTING;
3329 so->so_state |= SS_ISDISCONNECTING;
3330 so->so_rcv.sb_state |= SBS_CANTRCVMORE;
3331 sorwakeup_locked(so);
3332 SOCKBUF_LOCK(&so->so_snd);
3333 so->so_snd.sb_state |= SBS_CANTSENDMORE;
3334 sowwakeup_locked(so);
3335 wakeup(&so->so_timeo);
3339 soisdisconnected(struct socket *so)
3343 * Note: This code assumes that SOCK_LOCK(so) and
3344 * SOCKBUF_LOCK(&so->so_rcv) are the same.
3346 SOCKBUF_LOCK(&so->so_rcv);
3347 so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
3348 so->so_state |= SS_ISDISCONNECTED;
3349 so->so_rcv.sb_state |= SBS_CANTRCVMORE;
3350 sorwakeup_locked(so);
3351 SOCKBUF_LOCK(&so->so_snd);
3352 so->so_snd.sb_state |= SBS_CANTSENDMORE;
3353 sbdrop_locked(&so->so_snd, so->so_snd.sb_cc);
3354 sowwakeup_locked(so);
3355 wakeup(&so->so_timeo);
3359 * Make a copy of a sockaddr in a malloced buffer of type M_SONAME.
3362 sodupsockaddr(const struct sockaddr *sa, int mflags)
3364 struct sockaddr *sa2;
3366 sa2 = malloc(sa->sa_len, M_SONAME, mflags);
3368 bcopy(sa, sa2, sa->sa_len);
3373 * Register per-socket buffer upcalls.
3376 soupcall_set(struct socket *so, int which,
3377 int (*func)(struct socket *, void *, int), void *arg)
3389 panic("soupcall_set: bad which");
3391 SOCKBUF_LOCK_ASSERT(sb);
3393 /* XXX: accf_http actually wants to do this on purpose. */
3394 KASSERT(sb->sb_upcall == NULL, ("soupcall_set: overwriting upcall"));
3396 sb->sb_upcall = func;
3397 sb->sb_upcallarg = arg;
3398 sb->sb_flags |= SB_UPCALL;
3402 soupcall_clear(struct socket *so, int which)
3414 panic("soupcall_clear: bad which");
3416 SOCKBUF_LOCK_ASSERT(sb);
3417 KASSERT(sb->sb_upcall != NULL, ("soupcall_clear: no upcall to clear"));
3418 sb->sb_upcall = NULL;
3419 sb->sb_upcallarg = NULL;
3420 sb->sb_flags &= ~SB_UPCALL;
3424 * Create an external-format (``xsocket'') structure using the information in
3425 * the kernel-format socket structure pointed to by so. This is done to
3426 * reduce the spew of irrelevant information over this interface, to isolate
3427 * user code from changes in the kernel structure, and potentially to provide
3428 * information-hiding if we decide that some of this information should be
3429 * hidden from users.
3432 sotoxsocket(struct socket *so, struct xsocket *xso)
3435 xso->xso_len = sizeof *xso;
3437 xso->so_type = so->so_type;
3438 xso->so_options = so->so_options;
3439 xso->so_linger = so->so_linger;
3440 xso->so_state = so->so_state;
3441 xso->so_pcb = so->so_pcb;
3442 xso->xso_protocol = so->so_proto->pr_protocol;
3443 xso->xso_family = so->so_proto->pr_domain->dom_family;
3444 xso->so_qlen = so->so_qlen;
3445 xso->so_incqlen = so->so_incqlen;
3446 xso->so_qlimit = so->so_qlimit;
3447 xso->so_timeo = so->so_timeo;
3448 xso->so_error = so->so_error;
3449 xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
3450 xso->so_oobmark = so->so_oobmark;
3451 sbtoxsockbuf(&so->so_snd, &xso->so_snd);
3452 sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
3453 xso->so_uid = so->so_cred->cr_uid;
3458 * Socket accessor functions to provide external consumers with
3459 * a safe interface to socket state
3464 so_listeners_apply_all(struct socket *so, void (*func)(struct socket *, void *),
3468 TAILQ_FOREACH(so, &so->so_comp, so_list)
3473 so_sockbuf_rcv(struct socket *so)
3476 return (&so->so_rcv);
3480 so_sockbuf_snd(struct socket *so)
3483 return (&so->so_snd);
3487 so_state_get(const struct socket *so)
3490 return (so->so_state);
3494 so_state_set(struct socket *so, int val)
3501 so_options_get(const struct socket *so)
3504 return (so->so_options);
3508 so_options_set(struct socket *so, int val)
3511 so->so_options = val;
3515 so_error_get(const struct socket *so)
3518 return (so->so_error);
3522 so_error_set(struct socket *so, int val)
3529 so_linger_get(const struct socket *so)
3532 return (so->so_linger);
3536 so_linger_set(struct socket *so, int val)
3539 so->so_linger = val;
3543 so_protosw_get(const struct socket *so)
3546 return (so->so_proto);
3550 so_protosw_set(struct socket *so, struct protosw *val)
3557 so_sorwakeup(struct socket *so)
3564 so_sowwakeup(struct socket *so)
3571 so_sorwakeup_locked(struct socket *so)
3574 sorwakeup_locked(so);
3578 so_sowwakeup_locked(struct socket *so)
3581 sowwakeup_locked(so);
3585 so_lock(struct socket *so)
3592 so_unlock(struct socket *so)