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.
97 #include <sys/cdefs.h>
98 __FBSDID("$FreeBSD$");
100 #include "opt_inet.h"
101 #include "opt_inet6.h"
102 #include "opt_zero.h"
103 #include "opt_compat.h"
105 #include <sys/param.h>
106 #include <sys/systm.h>
107 #include <sys/fcntl.h>
108 #include <sys/limits.h>
109 #include <sys/lock.h>
111 #include <sys/malloc.h>
112 #include <sys/mbuf.h>
113 #include <sys/mutex.h>
114 #include <sys/domain.h>
115 #include <sys/file.h> /* for struct knote */
116 #include <sys/kernel.h>
117 #include <sys/event.h>
118 #include <sys/eventhandler.h>
119 #include <sys/poll.h>
120 #include <sys/proc.h>
121 #include <sys/protosw.h>
122 #include <sys/socket.h>
123 #include <sys/socketvar.h>
124 #include <sys/resourcevar.h>
125 #include <net/route.h>
126 #include <sys/signalvar.h>
127 #include <sys/stat.h>
129 #include <sys/sysctl.h>
131 #include <sys/jail.h>
133 #include <net/vnet.h>
135 #include <security/mac/mac_framework.h>
139 #ifdef COMPAT_FREEBSD32
140 #include <sys/mount.h>
141 #include <sys/sysent.h>
142 #include <compat/freebsd32/freebsd32.h>
145 static int soreceive_rcvoob(struct socket *so, struct uio *uio,
148 static void filt_sordetach(struct knote *kn);
149 static int filt_soread(struct knote *kn, long hint);
150 static void filt_sowdetach(struct knote *kn);
151 static int filt_sowrite(struct knote *kn, long hint);
152 static int filt_solisten(struct knote *kn, long hint);
154 static struct filterops solisten_filtops = {
156 .f_detach = filt_sordetach,
157 .f_event = filt_solisten,
159 static struct filterops soread_filtops = {
161 .f_detach = filt_sordetach,
162 .f_event = filt_soread,
164 static struct filterops sowrite_filtops = {
166 .f_detach = filt_sowdetach,
167 .f_event = filt_sowrite,
170 uma_zone_t socket_zone;
171 so_gen_t so_gencnt; /* generation count for sockets */
175 MALLOC_DEFINE(M_SONAME, "soname", "socket name");
176 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
178 static int somaxconn = SOMAXCONN;
179 static int sysctl_somaxconn(SYSCTL_HANDLER_ARGS);
180 /* XXX: we dont have SYSCTL_USHORT */
181 SYSCTL_PROC(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLTYPE_UINT | CTLFLAG_RW,
182 0, sizeof(int), sysctl_somaxconn, "I", "Maximum pending socket connection "
184 static int numopensockets;
185 SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD,
186 &numopensockets, 0, "Number of open sockets");
187 #ifdef ZERO_COPY_SOCKETS
188 /* These aren't static because they're used in other files. */
189 int so_zero_copy_send = 1;
190 int so_zero_copy_receive = 1;
191 SYSCTL_NODE(_kern_ipc, OID_AUTO, zero_copy, CTLFLAG_RD, 0,
192 "Zero copy controls");
193 SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, receive, CTLFLAG_RW,
194 &so_zero_copy_receive, 0, "Enable zero copy receive");
195 SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, send, CTLFLAG_RW,
196 &so_zero_copy_send, 0, "Enable zero copy send");
197 #endif /* ZERO_COPY_SOCKETS */
200 * accept_mtx locks down per-socket fields relating to accept queues. See
201 * socketvar.h for an annotation of the protected fields of struct socket.
203 struct mtx accept_mtx;
204 MTX_SYSINIT(accept_mtx, &accept_mtx, "accept", MTX_DEF);
207 * so_global_mtx protects so_gencnt, numopensockets, and the per-socket
210 static struct mtx so_global_mtx;
211 MTX_SYSINIT(so_global_mtx, &so_global_mtx, "so_glabel", MTX_DEF);
214 * General IPC sysctl name space, used by sockets and a variety of other IPC
217 SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW, 0, "IPC");
220 * Sysctl to get and set the maximum global sockets limit. Notify protocols
221 * of the change so that they can update their dependent limits as required.
224 sysctl_maxsockets(SYSCTL_HANDLER_ARGS)
226 int error, newmaxsockets;
228 newmaxsockets = maxsockets;
229 error = sysctl_handle_int(oidp, &newmaxsockets, 0, req);
230 if (error == 0 && req->newptr) {
231 if (newmaxsockets > maxsockets) {
232 maxsockets = newmaxsockets;
233 if (maxsockets > ((maxfiles / 4) * 3)) {
234 maxfiles = (maxsockets * 5) / 4;
235 maxfilesperproc = (maxfiles * 9) / 10;
237 EVENTHANDLER_INVOKE(maxsockets_change);
244 SYSCTL_PROC(_kern_ipc, OID_AUTO, maxsockets, CTLTYPE_INT|CTLFLAG_RW,
245 &maxsockets, 0, sysctl_maxsockets, "IU",
246 "Maximum number of sockets avaliable");
249 * Initialise maxsockets. This SYSINIT must be run after
253 init_maxsockets(void *ignored)
256 TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
257 maxsockets = imax(maxsockets, imax(maxfiles, nmbclusters));
259 SYSINIT(param, SI_SUB_TUNABLES, SI_ORDER_ANY, init_maxsockets, NULL);
262 * Socket operation routines. These routines are called by the routines in
263 * sys_socket.c or from a system process, and implement the semantics of
264 * socket operations by switching out to the protocol specific routines.
268 * Get a socket structure from our zone, and initialize it. Note that it
269 * would probably be better to allocate socket and PCB at the same time, but
270 * I'm not convinced that all the protocols can be easily modified to do
273 * soalloc() returns a socket with a ref count of 0.
275 static struct socket *
276 soalloc(struct vnet *vnet)
280 so = uma_zalloc(socket_zone, M_NOWAIT | M_ZERO);
284 if (mac_socket_init(so, M_NOWAIT) != 0) {
285 uma_zfree(socket_zone, so);
289 SOCKBUF_LOCK_INIT(&so->so_snd, "so_snd");
290 SOCKBUF_LOCK_INIT(&so->so_rcv, "so_rcv");
291 sx_init(&so->so_snd.sb_sx, "so_snd_sx");
292 sx_init(&so->so_rcv.sb_sx, "so_rcv_sx");
293 TAILQ_INIT(&so->so_aiojobq);
294 mtx_lock(&so_global_mtx);
295 so->so_gencnt = ++so_gencnt;
298 vnet->vnet_sockcnt++;
301 mtx_unlock(&so_global_mtx);
306 * Free the storage associated with a socket at the socket layer, tear down
307 * locks, labels, etc. All protocol state is assumed already to have been
308 * torn down (and possibly never set up) by the caller.
311 sodealloc(struct socket *so)
314 KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count));
315 KASSERT(so->so_pcb == NULL, ("sodealloc(): so_pcb != NULL"));
317 mtx_lock(&so_global_mtx);
318 so->so_gencnt = ++so_gencnt;
319 --numopensockets; /* Could be below, but faster here. */
321 so->so_vnet->vnet_sockcnt--;
323 mtx_unlock(&so_global_mtx);
324 if (so->so_rcv.sb_hiwat)
325 (void)chgsbsize(so->so_cred->cr_uidinfo,
326 &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
327 if (so->so_snd.sb_hiwat)
328 (void)chgsbsize(so->so_cred->cr_uidinfo,
329 &so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
331 /* remove acccept filter if one is present. */
332 if (so->so_accf != NULL)
333 do_setopt_accept_filter(so, NULL);
336 mac_socket_destroy(so);
339 sx_destroy(&so->so_snd.sb_sx);
340 sx_destroy(&so->so_rcv.sb_sx);
341 SOCKBUF_LOCK_DESTROY(&so->so_snd);
342 SOCKBUF_LOCK_DESTROY(&so->so_rcv);
343 uma_zfree(socket_zone, so);
347 * socreate returns a socket with a ref count of 1. The socket should be
348 * closed with soclose().
351 socreate(int dom, struct socket **aso, int type, int proto,
352 struct ucred *cred, struct thread *td)
359 prp = pffindproto(dom, proto, type);
361 prp = pffindtype(dom, type);
363 if (prp == NULL || prp->pr_usrreqs->pru_attach == NULL ||
364 prp->pr_usrreqs->pru_attach == pru_attach_notsupp)
365 return (EPROTONOSUPPORT);
367 if (prison_check_af(cred, prp->pr_domain->dom_family) != 0)
368 return (EPROTONOSUPPORT);
370 if (prp->pr_type != type)
372 so = soalloc(CRED_TO_VNET(cred));
376 TAILQ_INIT(&so->so_incomp);
377 TAILQ_INIT(&so->so_comp);
379 so->so_cred = crhold(cred);
380 if ((prp->pr_domain->dom_family == PF_INET) ||
381 (prp->pr_domain->dom_family == PF_ROUTE))
382 so->so_fibnum = td->td_proc->p_fibnum;
387 mac_socket_create(cred, so);
389 knlist_init_mtx(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv));
390 knlist_init_mtx(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd));
393 * Auto-sizing of socket buffers is managed by the protocols and
394 * the appropriate flags must be set in the pru_attach function.
396 CURVNET_SET(so->so_vnet);
397 error = (*prp->pr_usrreqs->pru_attach)(so, proto, td);
400 KASSERT(so->so_count == 1, ("socreate: so_count %d",
411 static int regression_sonewconn_earlytest = 1;
412 SYSCTL_INT(_regression, OID_AUTO, sonewconn_earlytest, CTLFLAG_RW,
413 ®ression_sonewconn_earlytest, 0, "Perform early sonewconn limit test");
417 * When an attempt at a new connection is noted on a socket which accepts
418 * connections, sonewconn is called. If the connection is possible (subject
419 * to space constraints, etc.) then we allocate a new structure, propoerly
420 * linked into the data structure of the original socket, and return this.
421 * Connstatus may be 0, or SO_ISCONFIRMING, or SO_ISCONNECTED.
423 * Note: the ref count on the socket is 0 on return.
426 sonewconn(struct socket *head, int connstatus)
432 over = (head->so_qlen > 3 * head->so_qlimit / 2);
435 if (regression_sonewconn_earlytest && over)
440 VNET_ASSERT(head->so_vnet);
441 so = soalloc(head->so_vnet);
444 if ((head->so_options & SO_ACCEPTFILTER) != 0)
447 so->so_type = head->so_type;
448 so->so_options = head->so_options &~ SO_ACCEPTCONN;
449 so->so_linger = head->so_linger;
450 so->so_state = head->so_state | SS_NOFDREF;
451 so->so_fibnum = head->so_fibnum;
452 so->so_proto = head->so_proto;
453 so->so_cred = crhold(head->so_cred);
455 mac_socket_newconn(head, so);
457 knlist_init_mtx(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv));
458 knlist_init_mtx(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd));
459 if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat) ||
460 (*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
464 so->so_rcv.sb_lowat = head->so_rcv.sb_lowat;
465 so->so_snd.sb_lowat = head->so_snd.sb_lowat;
466 so->so_rcv.sb_timeo = head->so_rcv.sb_timeo;
467 so->so_snd.sb_timeo = head->so_snd.sb_timeo;
468 so->so_rcv.sb_flags |= head->so_rcv.sb_flags & SB_AUTOSIZE;
469 so->so_snd.sb_flags |= head->so_snd.sb_flags & SB_AUTOSIZE;
470 so->so_state |= connstatus;
473 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
474 so->so_qstate |= SQ_COMP;
478 * Keep removing sockets from the head until there's room for
479 * us to insert on the tail. In pre-locking revisions, this
480 * was a simple if(), but as we could be racing with other
481 * threads and soabort() requires dropping locks, we must
482 * loop waiting for the condition to be true.
484 while (head->so_incqlen > head->so_qlimit) {
486 sp = TAILQ_FIRST(&head->so_incomp);
487 TAILQ_REMOVE(&head->so_incomp, sp, so_list);
489 sp->so_qstate &= ~SQ_INCOMP;
495 TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
496 so->so_qstate |= SQ_INCOMP;
502 wakeup_one(&head->so_timeo);
508 sobind(struct socket *so, struct sockaddr *nam, struct thread *td)
512 CURVNET_SET(so->so_vnet);
513 error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td);
519 * solisten() transitions a socket from a non-listening state to a listening
520 * state, but can also be used to update the listen queue depth on an
521 * existing listen socket. The protocol will call back into the sockets
522 * layer using solisten_proto_check() and solisten_proto() to check and set
523 * socket-layer listen state. Call backs are used so that the protocol can
524 * acquire both protocol and socket layer locks in whatever order is required
527 * Protocol implementors are advised to hold the socket lock across the
528 * socket-layer test and set to avoid races at the socket layer.
531 solisten(struct socket *so, int backlog, struct thread *td)
534 return ((*so->so_proto->pr_usrreqs->pru_listen)(so, backlog, td));
538 solisten_proto_check(struct socket *so)
541 SOCK_LOCK_ASSERT(so);
543 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
550 solisten_proto(struct socket *so, int backlog)
553 SOCK_LOCK_ASSERT(so);
555 if (backlog < 0 || backlog > somaxconn)
557 so->so_qlimit = backlog;
558 so->so_options |= SO_ACCEPTCONN;
562 * Attempt to free a socket. This should really be sotryfree().
564 * sofree() will succeed if:
566 * - There are no outstanding file descriptor references or related consumers
569 * - The socket has been closed by user space, if ever open (SS_NOFDREF).
571 * - The protocol does not have an outstanding strong reference on the socket
574 * - The socket is not in a completed connection queue, so a process has been
575 * notified that it is present. If it is removed, the user process may
576 * block in accept() despite select() saying the socket was ready.
578 * Otherwise, it will quietly abort so that a future call to sofree(), when
579 * conditions are right, can succeed.
582 sofree(struct socket *so)
584 struct protosw *pr = so->so_proto;
587 ACCEPT_LOCK_ASSERT();
588 SOCK_LOCK_ASSERT(so);
590 if ((so->so_state & SS_NOFDREF) == 0 || so->so_count != 0 ||
591 (so->so_state & SS_PROTOREF) || (so->so_qstate & SQ_COMP)) {
599 KASSERT((so->so_qstate & SQ_COMP) != 0 ||
600 (so->so_qstate & SQ_INCOMP) != 0,
601 ("sofree: so_head != NULL, but neither SQ_COMP nor "
603 KASSERT((so->so_qstate & SQ_COMP) == 0 ||
604 (so->so_qstate & SQ_INCOMP) == 0,
605 ("sofree: so->so_qstate is SQ_COMP and also SQ_INCOMP"));
606 TAILQ_REMOVE(&head->so_incomp, so, so_list);
608 so->so_qstate &= ~SQ_INCOMP;
611 KASSERT((so->so_qstate & SQ_COMP) == 0 &&
612 (so->so_qstate & SQ_INCOMP) == 0,
613 ("sofree: so_head == NULL, but still SQ_COMP(%d) or SQ_INCOMP(%d)",
614 so->so_qstate & SQ_COMP, so->so_qstate & SQ_INCOMP));
615 if (so->so_options & SO_ACCEPTCONN) {
616 KASSERT((TAILQ_EMPTY(&so->so_comp)), ("sofree: so_comp populated"));
617 KASSERT((TAILQ_EMPTY(&so->so_incomp)), ("sofree: so_comp populated"));
622 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
623 (*pr->pr_domain->dom_dispose)(so->so_rcv.sb_mb);
624 if (pr->pr_usrreqs->pru_detach != NULL)
625 (*pr->pr_usrreqs->pru_detach)(so);
628 * From this point on, we assume that no other references to this
629 * socket exist anywhere else in the stack. Therefore, no locks need
630 * to be acquired or held.
632 * We used to do a lot of socket buffer and socket locking here, as
633 * well as invoke sorflush() and perform wakeups. The direct call to
634 * dom_dispose() and sbrelease_internal() are an inlining of what was
635 * necessary from sorflush().
637 * Notice that the socket buffer and kqueue state are torn down
638 * before calling pru_detach. This means that protocols shold not
639 * assume they can perform socket wakeups, etc, in their detach code.
641 sbdestroy(&so->so_snd, so);
642 sbdestroy(&so->so_rcv, so);
643 knlist_destroy(&so->so_rcv.sb_sel.si_note);
644 knlist_destroy(&so->so_snd.sb_sel.si_note);
649 * Close a socket on last file table reference removal. Initiate disconnect
650 * if connected. Free socket when disconnect complete.
652 * This function will sorele() the socket. Note that soclose() may be called
653 * prior to the ref count reaching zero. The actual socket structure will
654 * not be freed until the ref count reaches zero.
657 soclose(struct socket *so)
661 KASSERT(!(so->so_state & SS_NOFDREF), ("soclose: SS_NOFDREF on enter"));
663 CURVNET_SET(so->so_vnet);
664 funsetown(&so->so_sigio);
665 if (so->so_state & SS_ISCONNECTED) {
666 if ((so->so_state & SS_ISDISCONNECTING) == 0) {
667 error = sodisconnect(so);
669 if (error == ENOTCONN)
674 if (so->so_options & SO_LINGER) {
675 if ((so->so_state & SS_ISDISCONNECTING) &&
676 (so->so_state & SS_NBIO))
678 while (so->so_state & SS_ISCONNECTED) {
679 error = tsleep(&so->so_timeo,
680 PSOCK | PCATCH, "soclos", so->so_linger * hz);
688 if (so->so_proto->pr_usrreqs->pru_close != NULL)
689 (*so->so_proto->pr_usrreqs->pru_close)(so);
690 if (so->so_options & SO_ACCEPTCONN) {
693 while ((sp = TAILQ_FIRST(&so->so_incomp)) != NULL) {
694 TAILQ_REMOVE(&so->so_incomp, sp, so_list);
696 sp->so_qstate &= ~SQ_INCOMP;
702 while ((sp = TAILQ_FIRST(&so->so_comp)) != NULL) {
703 TAILQ_REMOVE(&so->so_comp, sp, so_list);
705 sp->so_qstate &= ~SQ_COMP;
715 KASSERT((so->so_state & SS_NOFDREF) == 0, ("soclose: NOFDREF"));
716 so->so_state |= SS_NOFDREF;
723 * soabort() is used to abruptly tear down a connection, such as when a
724 * resource limit is reached (listen queue depth exceeded), or if a listen
725 * socket is closed while there are sockets waiting to be accepted.
727 * This interface is tricky, because it is called on an unreferenced socket,
728 * and must be called only by a thread that has actually removed the socket
729 * from the listen queue it was on, or races with other threads are risked.
731 * This interface will call into the protocol code, so must not be called
732 * with any socket locks held. Protocols do call it while holding their own
733 * recursible protocol mutexes, but this is something that should be subject
734 * to review in the future.
737 soabort(struct socket *so)
741 * In as much as is possible, assert that no references to this
742 * socket are held. This is not quite the same as asserting that the
743 * current thread is responsible for arranging for no references, but
744 * is as close as we can get for now.
746 KASSERT(so->so_count == 0, ("soabort: so_count"));
747 KASSERT((so->so_state & SS_PROTOREF) == 0, ("soabort: SS_PROTOREF"));
748 KASSERT(so->so_state & SS_NOFDREF, ("soabort: !SS_NOFDREF"));
749 KASSERT((so->so_state & SQ_COMP) == 0, ("soabort: SQ_COMP"));
750 KASSERT((so->so_state & SQ_INCOMP) == 0, ("soabort: SQ_INCOMP"));
752 if (so->so_proto->pr_usrreqs->pru_abort != NULL)
753 (*so->so_proto->pr_usrreqs->pru_abort)(so);
760 soaccept(struct socket *so, struct sockaddr **nam)
765 KASSERT((so->so_state & SS_NOFDREF) != 0, ("soaccept: !NOFDREF"));
766 so->so_state &= ~SS_NOFDREF;
768 error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam);
773 soconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
777 if (so->so_options & SO_ACCEPTCONN)
780 CURVNET_SET(so->so_vnet);
782 * If protocol is connection-based, can only connect once.
783 * Otherwise, if connected, try to disconnect first. This allows
784 * user to disconnect by connecting to, e.g., a null address.
786 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
787 ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
788 (error = sodisconnect(so)))) {
792 * Prevent accumulated error from previous connection from
796 error = (*so->so_proto->pr_usrreqs->pru_connect)(so, nam, td);
804 soconnect2(struct socket *so1, struct socket *so2)
807 return ((*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2));
811 sodisconnect(struct socket *so)
815 if ((so->so_state & SS_ISCONNECTED) == 0)
817 if (so->so_state & SS_ISDISCONNECTING)
819 error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so);
823 #ifdef ZERO_COPY_SOCKETS
824 struct so_zerocopy_stats{
829 struct so_zerocopy_stats so_zerocp_stats = {0,0,0};
830 #include <netinet/in.h>
831 #include <net/route.h>
832 #include <netinet/in_pcb.h>
834 #include <vm/vm_page.h>
835 #include <vm/vm_object.h>
838 * sosend_copyin() is only used if zero copy sockets are enabled. Otherwise
839 * sosend_dgram() and sosend_generic() use m_uiotombuf().
841 * sosend_copyin() accepts a uio and prepares an mbuf chain holding part or
842 * all of the data referenced by the uio. If desired, it uses zero-copy.
843 * *space will be updated to reflect data copied in.
845 * NB: If atomic I/O is requested, the caller must already have checked that
846 * space can hold resid bytes.
848 * NB: In the event of an error, the caller may need to free the partial
849 * chain pointed to by *mpp. The contents of both *uio and *space may be
850 * modified even in the case of an error.
853 sosend_copyin(struct uio *uio, struct mbuf **retmp, int atomic, long *space,
856 struct mbuf *m, **mp, *top;
859 #ifdef ZERO_COPY_SOCKETS
866 resid = uio->uio_resid;
869 #ifdef ZERO_COPY_SOCKETS
871 #endif /* ZERO_COPY_SOCKETS */
872 if (resid >= MINCLSIZE) {
873 #ifdef ZERO_COPY_SOCKETS
875 m = m_gethdr(M_WAITOK, MT_DATA);
877 m->m_pkthdr.rcvif = NULL;
879 m = m_get(M_WAITOK, MT_DATA);
880 if (so_zero_copy_send &&
883 uio->uio_iov->iov_len>=PAGE_SIZE) {
884 so_zerocp_stats.size_ok++;
885 so_zerocp_stats.align_ok++;
886 cow_send = socow_setup(m, uio);
890 m_clget(m, M_WAITOK);
891 len = min(min(MCLBYTES, resid), *space);
893 #else /* ZERO_COPY_SOCKETS */
895 m = m_getcl(M_WAIT, MT_DATA, M_PKTHDR);
897 m->m_pkthdr.rcvif = NULL;
899 m = m_getcl(M_WAIT, MT_DATA, 0);
900 len = min(min(MCLBYTES, resid), *space);
901 #endif /* ZERO_COPY_SOCKETS */
904 m = m_gethdr(M_WAIT, MT_DATA);
906 m->m_pkthdr.rcvif = NULL;
908 len = min(min(MHLEN, resid), *space);
910 * For datagram protocols, leave room
911 * for protocol headers in first mbuf.
913 if (atomic && m && len < MHLEN)
916 m = m_get(M_WAIT, MT_DATA);
917 len = min(min(MLEN, resid), *space);
926 #ifdef ZERO_COPY_SOCKETS
930 #endif /* ZERO_COPY_SOCKETS */
931 error = uiomove(mtod(m, void *), (int)len, uio);
932 resid = uio->uio_resid;
935 top->m_pkthdr.len += len;
941 top->m_flags |= M_EOR;
944 } while (*space > 0 && atomic);
949 #endif /*ZERO_COPY_SOCKETS*/
951 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? 0 : SBL_WAIT)
954 sosend_dgram(struct socket *so, struct sockaddr *addr, struct uio *uio,
955 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
958 int clen = 0, error, dontroute;
959 #ifdef ZERO_COPY_SOCKETS
960 int atomic = sosendallatonce(so) || top;
963 KASSERT(so->so_type == SOCK_DGRAM, ("sodgram_send: !SOCK_DGRAM"));
964 KASSERT(so->so_proto->pr_flags & PR_ATOMIC,
965 ("sodgram_send: !PR_ATOMIC"));
968 resid = uio->uio_resid;
970 resid = top->m_pkthdr.len;
972 * In theory resid should be unsigned. However, space must be
973 * signed, as it might be less than 0 if we over-committed, and we
974 * must use a signed comparison of space and resid. On the other
975 * hand, a negative resid causes us to loop sending 0-length
976 * segments to the protocol.
984 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0;
986 td->td_ru.ru_msgsnd++;
988 clen = control->m_len;
990 SOCKBUF_LOCK(&so->so_snd);
991 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
992 SOCKBUF_UNLOCK(&so->so_snd);
997 error = so->so_error;
999 SOCKBUF_UNLOCK(&so->so_snd);
1002 if ((so->so_state & SS_ISCONNECTED) == 0) {
1004 * `sendto' and `sendmsg' is allowed on a connection-based
1005 * socket if it supports implied connect. Return ENOTCONN if
1006 * not connected and no address is supplied.
1008 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1009 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1010 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1011 !(resid == 0 && clen != 0)) {
1012 SOCKBUF_UNLOCK(&so->so_snd);
1016 } else if (addr == NULL) {
1017 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1020 error = EDESTADDRREQ;
1021 SOCKBUF_UNLOCK(&so->so_snd);
1027 * Do we need MSG_OOB support in SOCK_DGRAM? Signs here may be a
1028 * problem and need fixing.
1030 space = sbspace(&so->so_snd);
1031 if (flags & MSG_OOB)
1034 SOCKBUF_UNLOCK(&so->so_snd);
1035 if (resid > space) {
1041 if (flags & MSG_EOR)
1042 top->m_flags |= M_EOR;
1044 #ifdef ZERO_COPY_SOCKETS
1045 error = sosend_copyin(uio, &top, atomic, &space, flags);
1050 * Copy the data from userland into a mbuf chain.
1051 * If no data is to be copied in, a single empty mbuf
1054 top = m_uiotombuf(uio, M_WAITOK, space, max_hdr,
1055 (M_PKTHDR | ((flags & MSG_EOR) ? M_EOR : 0)));
1057 error = EFAULT; /* only possible error */
1060 space -= resid - uio->uio_resid;
1062 resid = uio->uio_resid;
1064 KASSERT(resid == 0, ("sosend_dgram: resid != 0"));
1066 * XXXRW: Frobbing SO_DONTROUTE here is even worse without sblock
1071 so->so_options |= SO_DONTROUTE;
1075 * XXX all the SBS_CANTSENDMORE checks previously done could be out
1076 * of date. We could have recieved a reset packet in an interrupt or
1077 * maybe we slept while doing page faults in uiomove() etc. We could
1078 * probably recheck again inside the locking protection here, but
1079 * there are probably other places that this also happens. We must
1082 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1083 (flags & MSG_OOB) ? PRUS_OOB :
1085 * If the user set MSG_EOF, the protocol understands this flag and
1086 * nothing left to send then use PRU_SEND_EOF instead of PRU_SEND.
1088 ((flags & MSG_EOF) &&
1089 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1092 /* If there is more to send set PRUS_MORETOCOME */
1093 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1094 top, addr, control, td);
1097 so->so_options &= ~SO_DONTROUTE;
1106 if (control != NULL)
1112 * Send on a socket. If send must go all at once and message is larger than
1113 * send buffering, then hard error. Lock against other senders. If must go
1114 * all at once and not enough room now, then inform user that this would
1115 * block and do nothing. Otherwise, if nonblocking, send as much as
1116 * possible. The data to be sent is described by "uio" if nonzero, otherwise
1117 * by the mbuf chain "top" (which must be null if uio is not). Data provided
1118 * in mbuf chain must be small enough to send all at once.
1120 * Returns nonzero on error, timeout or signal; callers must check for short
1121 * counts if EINTR/ERESTART are returned. Data and control buffers are freed
1125 sosend_generic(struct socket *so, struct sockaddr *addr, struct uio *uio,
1126 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1129 int clen = 0, error, dontroute;
1130 int atomic = sosendallatonce(so) || top;
1133 resid = uio->uio_resid;
1135 resid = top->m_pkthdr.len;
1137 * In theory resid should be unsigned. However, space must be
1138 * signed, as it might be less than 0 if we over-committed, and we
1139 * must use a signed comparison of space and resid. On the other
1140 * hand, a negative resid causes us to loop sending 0-length
1141 * segments to the protocol.
1143 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
1144 * type sockets since that's an error.
1146 if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
1152 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
1153 (so->so_proto->pr_flags & PR_ATOMIC);
1155 td->td_ru.ru_msgsnd++;
1156 if (control != NULL)
1157 clen = control->m_len;
1159 error = sblock(&so->so_snd, SBLOCKWAIT(flags));
1165 SOCKBUF_LOCK(&so->so_snd);
1166 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1167 SOCKBUF_UNLOCK(&so->so_snd);
1172 error = so->so_error;
1174 SOCKBUF_UNLOCK(&so->so_snd);
1177 if ((so->so_state & SS_ISCONNECTED) == 0) {
1179 * `sendto' and `sendmsg' is allowed on a connection-
1180 * based socket if it supports implied connect.
1181 * Return ENOTCONN if not connected and no address is
1184 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1185 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1186 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1187 !(resid == 0 && clen != 0)) {
1188 SOCKBUF_UNLOCK(&so->so_snd);
1192 } else if (addr == NULL) {
1193 SOCKBUF_UNLOCK(&so->so_snd);
1194 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1197 error = EDESTADDRREQ;
1201 space = sbspace(&so->so_snd);
1202 if (flags & MSG_OOB)
1204 if ((atomic && resid > so->so_snd.sb_hiwat) ||
1205 clen > so->so_snd.sb_hiwat) {
1206 SOCKBUF_UNLOCK(&so->so_snd);
1210 if (space < resid + clen &&
1211 (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1212 if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1213 SOCKBUF_UNLOCK(&so->so_snd);
1214 error = EWOULDBLOCK;
1217 error = sbwait(&so->so_snd);
1218 SOCKBUF_UNLOCK(&so->so_snd);
1223 SOCKBUF_UNLOCK(&so->so_snd);
1228 if (flags & MSG_EOR)
1229 top->m_flags |= M_EOR;
1231 #ifdef ZERO_COPY_SOCKETS
1232 error = sosend_copyin(uio, &top, atomic,
1238 * Copy the data from userland into a mbuf
1239 * chain. If no data is to be copied in,
1240 * a single empty mbuf is returned.
1242 top = m_uiotombuf(uio, M_WAITOK, space,
1243 (atomic ? max_hdr : 0),
1244 (atomic ? M_PKTHDR : 0) |
1245 ((flags & MSG_EOR) ? M_EOR : 0));
1247 error = EFAULT; /* only possible error */
1250 space -= resid - uio->uio_resid;
1252 resid = uio->uio_resid;
1256 so->so_options |= SO_DONTROUTE;
1260 * XXX all the SBS_CANTSENDMORE checks previously
1261 * done could be out of date. We could have recieved
1262 * a reset packet in an interrupt or maybe we slept
1263 * while doing page faults in uiomove() etc. We
1264 * could probably recheck again inside the locking
1265 * protection here, but there are probably other
1266 * places that this also happens. We must rethink
1269 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1270 (flags & MSG_OOB) ? PRUS_OOB :
1272 * If the user set MSG_EOF, the protocol understands
1273 * this flag and nothing left to send then use
1274 * PRU_SEND_EOF instead of PRU_SEND.
1276 ((flags & MSG_EOF) &&
1277 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1280 /* If there is more to send set PRUS_MORETOCOME. */
1281 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1282 top, addr, control, td);
1285 so->so_options &= ~SO_DONTROUTE;
1293 } while (resid && space > 0);
1297 sbunlock(&so->so_snd);
1301 if (control != NULL)
1307 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
1308 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1312 CURVNET_SET(so->so_vnet);
1313 error = so->so_proto->pr_usrreqs->pru_sosend(so, addr, uio, top,
1314 control, flags, td);
1320 * The part of soreceive() that implements reading non-inline out-of-band
1321 * data from a socket. For more complete comments, see soreceive(), from
1322 * which this code originated.
1324 * Note that soreceive_rcvoob(), unlike the remainder of soreceive(), is
1325 * unable to return an mbuf chain to the caller.
1328 soreceive_rcvoob(struct socket *so, struct uio *uio, int flags)
1330 struct protosw *pr = so->so_proto;
1334 KASSERT(flags & MSG_OOB, ("soreceive_rcvoob: (flags & MSG_OOB) == 0"));
1336 m = m_get(M_WAIT, MT_DATA);
1337 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK);
1341 #ifdef ZERO_COPY_SOCKETS
1342 if (so_zero_copy_receive) {
1345 if ((m->m_flags & M_EXT)
1346 && (m->m_ext.ext_type == EXT_DISPOSABLE))
1351 error = uiomoveco(mtod(m, void *),
1352 min(uio->uio_resid, m->m_len),
1355 #endif /* ZERO_COPY_SOCKETS */
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;
1403 * Implement receive operations on a socket. We depend on the way that
1404 * records are added to the sockbuf by sbappend. In particular, each record
1405 * (mbufs linked through m_next) must begin with an address if the protocol
1406 * so specifies, followed by an optional mbuf or mbufs containing ancillary
1407 * data, and then zero or more mbufs of data. In order to allow parallelism
1408 * between network receive and copying to user space, as well as avoid
1409 * sleeping with a mutex held, we release the socket buffer mutex during the
1410 * user space copy. Although the sockbuf is locked, new data may still be
1411 * appended, and thus we must maintain consistency of the sockbuf during that
1414 * The caller may receive the data as a single mbuf chain by supplying an
1415 * mbuf **mp0 for use in returning the chain. The uio is then used only for
1416 * the count in uio_resid.
1419 soreceive_generic(struct socket *so, struct sockaddr **psa, struct uio *uio,
1420 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1422 struct mbuf *m, **mp;
1423 int flags, len, error, offset;
1424 struct protosw *pr = so->so_proto;
1425 struct mbuf *nextrecord;
1427 int 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)
1444 (*pr->pr_usrreqs->pru_rcvd)(so, 0);
1446 error = sblock(&so->so_rcv, SBLOCKWAIT(flags));
1451 SOCKBUF_LOCK(&so->so_rcv);
1452 m = so->so_rcv.sb_mb;
1454 * If we have less data than requested, block awaiting more (subject
1455 * to any timeout) if:
1456 * 1. the current count is less than the low water mark, or
1457 * 2. MSG_WAITALL is set, and it is possible to do the entire
1458 * receive operation at once if we block (resid <= hiwat).
1459 * 3. MSG_DONTWAIT is not set
1460 * If MSG_WAITALL is set but resid is larger than the receive buffer,
1461 * we have to do the receive in sections, and thus risk returning a
1462 * short count if a timeout or signal occurs after we start.
1464 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
1465 so->so_rcv.sb_cc < uio->uio_resid) &&
1466 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1467 ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1468 m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) {
1469 KASSERT(m != NULL || !so->so_rcv.sb_cc,
1470 ("receive: m == %p so->so_rcv.sb_cc == %u",
1471 m, so->so_rcv.sb_cc));
1475 error = so->so_error;
1476 if ((flags & MSG_PEEK) == 0)
1478 SOCKBUF_UNLOCK(&so->so_rcv);
1481 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1482 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
1484 SOCKBUF_UNLOCK(&so->so_rcv);
1489 for (; m != NULL; m = m->m_next)
1490 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1491 m = so->so_rcv.sb_mb;
1494 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1495 (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1496 SOCKBUF_UNLOCK(&so->so_rcv);
1500 if (uio->uio_resid == 0) {
1501 SOCKBUF_UNLOCK(&so->so_rcv);
1504 if ((so->so_state & SS_NBIO) ||
1505 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1506 SOCKBUF_UNLOCK(&so->so_rcv);
1507 error = EWOULDBLOCK;
1510 SBLASTRECORDCHK(&so->so_rcv);
1511 SBLASTMBUFCHK(&so->so_rcv);
1512 error = sbwait(&so->so_rcv);
1513 SOCKBUF_UNLOCK(&so->so_rcv);
1520 * From this point onward, we maintain 'nextrecord' as a cache of the
1521 * pointer to the next record in the socket buffer. We must keep the
1522 * various socket buffer pointers and local stack versions of the
1523 * pointers in sync, pushing out modifications before dropping the
1524 * socket buffer mutex, and re-reading them when picking it up.
1526 * Otherwise, we will race with the network stack appending new data
1527 * or records onto the socket buffer by using inconsistent/stale
1528 * versions of the field, possibly resulting in socket buffer
1531 * By holding the high-level sblock(), we prevent simultaneous
1532 * readers from pulling off the front of the socket buffer.
1534 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1536 uio->uio_td->td_ru.ru_msgrcv++;
1537 KASSERT(m == so->so_rcv.sb_mb, ("soreceive: m != so->so_rcv.sb_mb"));
1538 SBLASTRECORDCHK(&so->so_rcv);
1539 SBLASTMBUFCHK(&so->so_rcv);
1540 nextrecord = m->m_nextpkt;
1541 if (pr->pr_flags & PR_ADDR) {
1542 KASSERT(m->m_type == MT_SONAME,
1543 ("m->m_type == %d", m->m_type));
1546 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
1548 if (flags & MSG_PEEK) {
1551 sbfree(&so->so_rcv, m);
1552 so->so_rcv.sb_mb = m_free(m);
1553 m = so->so_rcv.sb_mb;
1554 sockbuf_pushsync(&so->so_rcv, nextrecord);
1559 * Process one or more MT_CONTROL mbufs present before any data mbufs
1560 * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1561 * just copy the data; if !MSG_PEEK, we call into the protocol to
1562 * perform externalization (or freeing if controlp == NULL).
1564 if (m != NULL && m->m_type == MT_CONTROL) {
1565 struct mbuf *cm = NULL, *cmn;
1566 struct mbuf **cme = &cm;
1569 if (flags & MSG_PEEK) {
1570 if (controlp != NULL) {
1571 *controlp = m_copy(m, 0, m->m_len);
1572 controlp = &(*controlp)->m_next;
1576 sbfree(&so->so_rcv, m);
1577 so->so_rcv.sb_mb = m->m_next;
1580 cme = &(*cme)->m_next;
1581 m = so->so_rcv.sb_mb;
1583 } while (m != NULL && m->m_type == MT_CONTROL);
1584 if ((flags & MSG_PEEK) == 0)
1585 sockbuf_pushsync(&so->so_rcv, nextrecord);
1586 while (cm != NULL) {
1589 if (pr->pr_domain->dom_externalize != NULL) {
1590 SOCKBUF_UNLOCK(&so->so_rcv);
1591 error = (*pr->pr_domain->dom_externalize)
1593 SOCKBUF_LOCK(&so->so_rcv);
1594 } else if (controlp != NULL)
1598 if (controlp != NULL) {
1600 while (*controlp != NULL)
1601 controlp = &(*controlp)->m_next;
1606 nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1608 nextrecord = so->so_rcv.sb_mb;
1612 if ((flags & MSG_PEEK) == 0) {
1613 KASSERT(m->m_nextpkt == nextrecord,
1614 ("soreceive: post-control, nextrecord !sync"));
1615 if (nextrecord == NULL) {
1616 KASSERT(so->so_rcv.sb_mb == m,
1617 ("soreceive: post-control, sb_mb!=m"));
1618 KASSERT(so->so_rcv.sb_lastrecord == m,
1619 ("soreceive: post-control, lastrecord!=m"));
1623 if (type == MT_OOBDATA)
1626 if ((flags & MSG_PEEK) == 0) {
1627 KASSERT(so->so_rcv.sb_mb == nextrecord,
1628 ("soreceive: sb_mb != nextrecord"));
1629 if (so->so_rcv.sb_mb == NULL) {
1630 KASSERT(so->so_rcv.sb_lastrecord == NULL,
1631 ("soreceive: sb_lastercord != NULL"));
1635 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1636 SBLASTRECORDCHK(&so->so_rcv);
1637 SBLASTMBUFCHK(&so->so_rcv);
1640 * Now continue to read any data mbufs off of the head of the socket
1641 * buffer until the read request is satisfied. Note that 'type' is
1642 * used to store the type of any mbuf reads that have happened so far
1643 * such that soreceive() can stop reading if the type changes, which
1644 * causes soreceive() to return only one of regular data and inline
1645 * out-of-band data in a single socket receive operation.
1649 while (m != NULL && uio->uio_resid > 0 && error == 0) {
1651 * If the type of mbuf has changed since the last mbuf
1652 * examined ('type'), end the receive operation.
1654 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1655 if (m->m_type == MT_OOBDATA) {
1656 if (type != MT_OOBDATA)
1658 } else if (type == MT_OOBDATA)
1661 KASSERT(m->m_type == MT_DATA,
1662 ("m->m_type == %d", m->m_type));
1663 so->so_rcv.sb_state &= ~SBS_RCVATMARK;
1664 len = uio->uio_resid;
1665 if (so->so_oobmark && len > so->so_oobmark - offset)
1666 len = so->so_oobmark - offset;
1667 if (len > m->m_len - moff)
1668 len = m->m_len - moff;
1670 * If mp is set, just pass back the mbufs. Otherwise copy
1671 * them out via the uio, then free. Sockbuf must be
1672 * consistent here (points to current mbuf, it points to next
1673 * record) when we drop priority; we must note any additions
1674 * to the sockbuf when we block interrupts again.
1677 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1678 SBLASTRECORDCHK(&so->so_rcv);
1679 SBLASTMBUFCHK(&so->so_rcv);
1680 SOCKBUF_UNLOCK(&so->so_rcv);
1681 #ifdef ZERO_COPY_SOCKETS
1682 if (so_zero_copy_receive) {
1685 if ((m->m_flags & M_EXT)
1686 && (m->m_ext.ext_type == EXT_DISPOSABLE))
1691 error = uiomoveco(mtod(m, char *) + moff,
1695 #endif /* ZERO_COPY_SOCKETS */
1696 error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1697 SOCKBUF_LOCK(&so->so_rcv);
1700 * The MT_SONAME mbuf has already been removed
1701 * from the record, so it is necessary to
1702 * remove the data mbufs, if any, to preserve
1703 * the invariant in the case of PR_ADDR that
1704 * requires MT_SONAME mbufs at the head of
1707 if (m && pr->pr_flags & PR_ATOMIC &&
1708 ((flags & MSG_PEEK) == 0))
1709 (void)sbdroprecord_locked(&so->so_rcv);
1710 SOCKBUF_UNLOCK(&so->so_rcv);
1714 uio->uio_resid -= len;
1715 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1716 if (len == m->m_len - moff) {
1717 if (m->m_flags & M_EOR)
1719 if (flags & MSG_PEEK) {
1723 nextrecord = m->m_nextpkt;
1724 sbfree(&so->so_rcv, m);
1728 so->so_rcv.sb_mb = m = m->m_next;
1731 so->so_rcv.sb_mb = m_free(m);
1732 m = so->so_rcv.sb_mb;
1734 sockbuf_pushsync(&so->so_rcv, nextrecord);
1735 SBLASTRECORDCHK(&so->so_rcv);
1736 SBLASTMBUFCHK(&so->so_rcv);
1739 if (flags & MSG_PEEK)
1745 if (flags & MSG_DONTWAIT)
1746 copy_flag = M_DONTWAIT;
1749 if (copy_flag == M_WAIT)
1750 SOCKBUF_UNLOCK(&so->so_rcv);
1751 *mp = m_copym(m, 0, len, copy_flag);
1752 if (copy_flag == M_WAIT)
1753 SOCKBUF_LOCK(&so->so_rcv);
1756 * m_copym() couldn't
1757 * allocate an mbuf. Adjust
1758 * uio_resid back (it was
1759 * adjusted down by len
1760 * bytes, which we didn't end
1761 * up "copying" over).
1763 uio->uio_resid += len;
1769 so->so_rcv.sb_cc -= len;
1772 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1773 if (so->so_oobmark) {
1774 if ((flags & MSG_PEEK) == 0) {
1775 so->so_oobmark -= len;
1776 if (so->so_oobmark == 0) {
1777 so->so_rcv.sb_state |= SBS_RCVATMARK;
1782 if (offset == so->so_oobmark)
1786 if (flags & MSG_EOR)
1789 * If the MSG_WAITALL flag is set (for non-atomic socket), we
1790 * must not quit until "uio->uio_resid == 0" or an error
1791 * termination. If a signal/timeout occurs, return with a
1792 * short count but without error. Keep sockbuf locked
1793 * against other readers.
1795 while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1796 !sosendallatonce(so) && nextrecord == NULL) {
1797 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1798 if (so->so_error || so->so_rcv.sb_state & SBS_CANTRCVMORE)
1801 * Notify the protocol that some data has been
1802 * drained before blocking.
1804 if (pr->pr_flags & PR_WANTRCVD) {
1805 SOCKBUF_UNLOCK(&so->so_rcv);
1806 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
1807 SOCKBUF_LOCK(&so->so_rcv);
1809 SBLASTRECORDCHK(&so->so_rcv);
1810 SBLASTMBUFCHK(&so->so_rcv);
1811 error = sbwait(&so->so_rcv);
1813 SOCKBUF_UNLOCK(&so->so_rcv);
1816 m = so->so_rcv.sb_mb;
1818 nextrecord = m->m_nextpkt;
1822 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1823 if (m != NULL && pr->pr_flags & PR_ATOMIC) {
1825 if ((flags & MSG_PEEK) == 0)
1826 (void) sbdroprecord_locked(&so->so_rcv);
1828 if ((flags & MSG_PEEK) == 0) {
1831 * First part is an inline SB_EMPTY_FIXUP(). Second
1832 * part makes sure sb_lastrecord is up-to-date if
1833 * there is still data in the socket buffer.
1835 so->so_rcv.sb_mb = nextrecord;
1836 if (so->so_rcv.sb_mb == NULL) {
1837 so->so_rcv.sb_mbtail = NULL;
1838 so->so_rcv.sb_lastrecord = NULL;
1839 } else if (nextrecord->m_nextpkt == NULL)
1840 so->so_rcv.sb_lastrecord = nextrecord;
1842 SBLASTRECORDCHK(&so->so_rcv);
1843 SBLASTMBUFCHK(&so->so_rcv);
1845 * If soreceive() is being done from the socket callback,
1846 * then don't need to generate ACK to peer to update window,
1847 * since ACK will be generated on return to TCP.
1849 if (!(flags & MSG_SOCALLBCK) &&
1850 (pr->pr_flags & PR_WANTRCVD)) {
1851 SOCKBUF_UNLOCK(&so->so_rcv);
1852 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
1853 SOCKBUF_LOCK(&so->so_rcv);
1856 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1857 if (orig_resid == uio->uio_resid && orig_resid &&
1858 (flags & MSG_EOR) == 0 && (so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0) {
1859 SOCKBUF_UNLOCK(&so->so_rcv);
1862 SOCKBUF_UNLOCK(&so->so_rcv);
1867 sbunlock(&so->so_rcv);
1872 * Optimized version of soreceive() for stream (TCP) sockets.
1874 #ifdef TCP_SORECEIVE_STREAM
1876 soreceive_stream(struct socket *so, struct sockaddr **psa, struct uio *uio,
1877 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1879 int len = 0, error = 0, flags, oresid;
1881 struct mbuf *m, *n = NULL;
1883 /* We only do stream sockets. */
1884 if (so->so_type != SOCK_STREAM)
1888 if (controlp != NULL)
1891 flags = *flagsp &~ MSG_EOR;
1894 if (flags & MSG_OOB)
1895 return (soreceive_rcvoob(so, uio, flags));
1901 /* Prevent other readers from entering the socket. */
1902 error = sblock(sb, SBLOCKWAIT(flags));
1907 /* Easy one, no space to copyout anything. */
1908 if (uio->uio_resid == 0) {
1912 oresid = uio->uio_resid;
1914 /* We will never ever get anything unless we are connected. */
1915 if (!(so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED))) {
1916 /* When disconnecting there may be still some data left. */
1919 if (!(so->so_state & SS_ISDISCONNECTED))
1924 /* Socket buffer is empty and we shall not block. */
1925 if (sb->sb_cc == 0 &&
1926 ((sb->sb_flags & SS_NBIO) || (flags & (MSG_DONTWAIT|MSG_NBIO)))) {
1932 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1934 /* Abort if socket has reported problems. */
1938 if (oresid > uio->uio_resid)
1940 error = so->so_error;
1941 if (!(flags & MSG_PEEK))
1946 /* Door is closed. Deliver what is left, if any. */
1947 if (sb->sb_state & SBS_CANTRCVMORE) {
1954 /* Socket buffer got some data that we shall deliver now. */
1955 if (sb->sb_cc > 0 && !(flags & MSG_WAITALL) &&
1956 ((sb->sb_flags & SS_NBIO) ||
1957 (flags & (MSG_DONTWAIT|MSG_NBIO)) ||
1958 sb->sb_cc >= sb->sb_lowat ||
1959 sb->sb_cc >= uio->uio_resid ||
1960 sb->sb_cc >= sb->sb_hiwat) ) {
1964 /* On MSG_WAITALL we must wait until all data or error arrives. */
1965 if ((flags & MSG_WAITALL) &&
1966 (sb->sb_cc >= uio->uio_resid || sb->sb_cc >= sb->sb_lowat))
1970 * Wait and block until (more) data comes in.
1971 * NB: Drops the sockbuf lock during wait.
1979 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1980 KASSERT(sb->sb_cc > 0, ("%s: sockbuf empty", __func__));
1981 KASSERT(sb->sb_mb != NULL, ("%s: sb_mb == NULL", __func__));
1985 uio->uio_td->td_ru.ru_msgrcv++;
1987 /* Fill uio until full or current end of socket buffer is reached. */
1988 len = min(uio->uio_resid, sb->sb_cc);
1990 /* Dequeue as many mbufs as possible. */
1991 if (!(flags & MSG_PEEK) && len >= sb->sb_mb->m_len) {
1992 for (*mp0 = m = sb->sb_mb;
1993 m != NULL && m->m_len <= len;
1996 uio->uio_resid -= m->m_len;
2001 if (sb->sb_mb == NULL)
2005 /* Copy the remainder. */
2007 KASSERT(sb->sb_mb != NULL,
2008 ("%s: len > 0 && sb->sb_mb empty", __func__));
2010 m = m_copym(sb->sb_mb, 0, len, M_DONTWAIT);
2012 len = 0; /* Don't flush data from sockbuf. */
2014 uio->uio_resid -= m->m_len;
2025 /* NB: Must unlock socket buffer as uiomove may sleep. */
2027 error = m_mbuftouio(uio, sb->sb_mb, len);
2032 SBLASTRECORDCHK(sb);
2036 * Remove the delivered data from the socket buffer unless we
2037 * were only peeking.
2039 if (!(flags & MSG_PEEK)) {
2041 sbdrop_locked(sb, len);
2043 /* Notify protocol that we drained some data. */
2044 if ((so->so_proto->pr_flags & PR_WANTRCVD) &&
2045 (((flags & MSG_WAITALL) && uio->uio_resid > 0) ||
2046 !(flags & MSG_SOCALLBCK))) {
2048 (*so->so_proto->pr_usrreqs->pru_rcvd)(so, flags);
2054 * For MSG_WAITALL we may have to loop again and wait for
2055 * more data to come in.
2057 if ((flags & MSG_WAITALL) && uio->uio_resid > 0)
2060 SOCKBUF_LOCK_ASSERT(sb);
2061 SBLASTRECORDCHK(sb);
2067 #endif /* TCP_SORECEIVE_STREAM */
2070 * Optimized version of soreceive() for simple datagram cases from userspace.
2071 * Unlike in the stream case, we're able to drop a datagram if copyout()
2072 * fails, and because we handle datagrams atomically, we don't need to use a
2073 * sleep lock to prevent I/O interlacing.
2076 soreceive_dgram(struct socket *so, struct sockaddr **psa, struct uio *uio,
2077 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2079 struct mbuf *m, *m2;
2080 int flags, len, error;
2081 struct protosw *pr = so->so_proto;
2082 struct mbuf *nextrecord;
2086 if (controlp != NULL)
2089 flags = *flagsp &~ MSG_EOR;
2094 * For any complicated cases, fall back to the full
2095 * soreceive_generic().
2097 if (mp0 != NULL || (flags & MSG_PEEK) || (flags & MSG_OOB))
2098 return (soreceive_generic(so, psa, uio, mp0, controlp,
2102 * Enforce restrictions on use.
2104 KASSERT((pr->pr_flags & PR_WANTRCVD) == 0,
2105 ("soreceive_dgram: wantrcvd"));
2106 KASSERT(pr->pr_flags & PR_ATOMIC, ("soreceive_dgram: !atomic"));
2107 KASSERT((so->so_rcv.sb_state & SBS_RCVATMARK) == 0,
2108 ("soreceive_dgram: SBS_RCVATMARK"));
2109 KASSERT((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0,
2110 ("soreceive_dgram: P_CONNREQUIRED"));
2113 * Loop blocking while waiting for a datagram.
2115 SOCKBUF_LOCK(&so->so_rcv);
2116 while ((m = so->so_rcv.sb_mb) == NULL) {
2117 KASSERT(so->so_rcv.sb_cc == 0,
2118 ("soreceive_dgram: sb_mb NULL but sb_cc %u",
2121 error = so->so_error;
2123 SOCKBUF_UNLOCK(&so->so_rcv);
2126 if (so->so_rcv.sb_state & SBS_CANTRCVMORE ||
2127 uio->uio_resid == 0) {
2128 SOCKBUF_UNLOCK(&so->so_rcv);
2131 if ((so->so_state & SS_NBIO) ||
2132 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
2133 SOCKBUF_UNLOCK(&so->so_rcv);
2134 return (EWOULDBLOCK);
2136 SBLASTRECORDCHK(&so->so_rcv);
2137 SBLASTMBUFCHK(&so->so_rcv);
2138 error = sbwait(&so->so_rcv);
2140 SOCKBUF_UNLOCK(&so->so_rcv);
2144 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2147 uio->uio_td->td_ru.ru_msgrcv++;
2148 SBLASTRECORDCHK(&so->so_rcv);
2149 SBLASTMBUFCHK(&so->so_rcv);
2150 nextrecord = m->m_nextpkt;
2151 if (nextrecord == NULL) {
2152 KASSERT(so->so_rcv.sb_lastrecord == m,
2153 ("soreceive_dgram: lastrecord != m"));
2156 KASSERT(so->so_rcv.sb_mb->m_nextpkt == nextrecord,
2157 ("soreceive_dgram: m_nextpkt != nextrecord"));
2160 * Pull 'm' and its chain off the front of the packet queue.
2162 so->so_rcv.sb_mb = NULL;
2163 sockbuf_pushsync(&so->so_rcv, nextrecord);
2166 * Walk 'm's chain and free that many bytes from the socket buffer.
2168 for (m2 = m; m2 != NULL; m2 = m2->m_next)
2169 sbfree(&so->so_rcv, m2);
2172 * Do a few last checks before we let go of the lock.
2174 SBLASTRECORDCHK(&so->so_rcv);
2175 SBLASTMBUFCHK(&so->so_rcv);
2176 SOCKBUF_UNLOCK(&so->so_rcv);
2178 if (pr->pr_flags & PR_ADDR) {
2179 KASSERT(m->m_type == MT_SONAME,
2180 ("m->m_type == %d", m->m_type));
2182 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
2187 /* XXXRW: Can this happen? */
2192 * Packet to copyout() is now in 'm' and it is disconnected from the
2195 * Process one or more MT_CONTROL mbufs present before any data mbufs
2196 * in the first mbuf chain on the socket buffer. We call into the
2197 * protocol to perform externalization (or freeing if controlp ==
2200 if (m->m_type == MT_CONTROL) {
2201 struct mbuf *cm = NULL, *cmn;
2202 struct mbuf **cme = &cm;
2208 cme = &(*cme)->m_next;
2210 } while (m != NULL && m->m_type == MT_CONTROL);
2211 while (cm != NULL) {
2214 if (pr->pr_domain->dom_externalize != NULL) {
2215 error = (*pr->pr_domain->dom_externalize)
2217 } else if (controlp != NULL)
2221 if (controlp != NULL) {
2222 while (*controlp != NULL)
2223 controlp = &(*controlp)->m_next;
2228 KASSERT(m->m_type == MT_DATA, ("soreceive_dgram: !data"));
2230 while (m != NULL && uio->uio_resid > 0) {
2231 len = uio->uio_resid;
2234 error = uiomove(mtod(m, char *), (int)len, uio);
2250 soreceive(struct socket *so, struct sockaddr **psa, struct uio *uio,
2251 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2254 return (so->so_proto->pr_usrreqs->pru_soreceive(so, psa, uio, mp0,
2259 soshutdown(struct socket *so, int how)
2261 struct protosw *pr = so->so_proto;
2264 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
2266 if (pr->pr_usrreqs->pru_flush != NULL) {
2267 (*pr->pr_usrreqs->pru_flush)(so, how);
2271 if (how != SHUT_RD) {
2272 CURVNET_SET(so->so_vnet);
2273 error = (*pr->pr_usrreqs->pru_shutdown)(so);
2281 sorflush(struct socket *so)
2283 struct sockbuf *sb = &so->so_rcv;
2284 struct protosw *pr = so->so_proto;
2288 * In order to avoid calling dom_dispose with the socket buffer mutex
2289 * held, and in order to generally avoid holding the lock for a long
2290 * time, we make a copy of the socket buffer and clear the original
2291 * (except locks, state). The new socket buffer copy won't have
2292 * initialized locks so we can only call routines that won't use or
2293 * assert those locks.
2295 * Dislodge threads currently blocked in receive and wait to acquire
2296 * a lock against other simultaneous readers before clearing the
2297 * socket buffer. Don't let our acquire be interrupted by a signal
2298 * despite any existing socket disposition on interruptable waiting.
2300 CURVNET_SET(so->so_vnet);
2302 (void) sblock(sb, SBL_WAIT | SBL_NOINTR);
2305 * Invalidate/clear most of the sockbuf structure, but leave selinfo
2306 * and mutex data unchanged.
2309 bzero(&asb, offsetof(struct sockbuf, sb_startzero));
2310 bcopy(&sb->sb_startzero, &asb.sb_startzero,
2311 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
2312 bzero(&sb->sb_startzero,
2313 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
2318 * Dispose of special rights and flush the socket buffer. Don't call
2319 * any unsafe routines (that rely on locks being initialized) on asb.
2321 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
2322 (*pr->pr_domain->dom_dispose)(asb.sb_mb);
2323 sbrelease_internal(&asb, so);
2328 * Perhaps this routine, and sooptcopyout(), below, ought to come in an
2329 * additional variant to handle the case where the option value needs to be
2330 * some kind of integer, but not a specific size. In addition to their use
2331 * here, these functions are also called by the protocol-level pr_ctloutput()
2335 sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
2340 * If the user gives us more than we wanted, we ignore it, but if we
2341 * don't get the minimum length the caller wants, we return EINVAL.
2342 * On success, sopt->sopt_valsize is set to however much we actually
2345 if ((valsize = sopt->sopt_valsize) < minlen)
2348 sopt->sopt_valsize = valsize = len;
2350 if (sopt->sopt_td != NULL)
2351 return (copyin(sopt->sopt_val, buf, valsize));
2353 bcopy(sopt->sopt_val, buf, valsize);
2358 * Kernel version of setsockopt(2).
2360 * XXX: optlen is size_t, not socklen_t
2363 so_setsockopt(struct socket *so, int level, int optname, void *optval,
2366 struct sockopt sopt;
2368 sopt.sopt_level = level;
2369 sopt.sopt_name = optname;
2370 sopt.sopt_dir = SOPT_SET;
2371 sopt.sopt_val = optval;
2372 sopt.sopt_valsize = optlen;
2373 sopt.sopt_td = NULL;
2374 return (sosetopt(so, &sopt));
2378 sosetopt(struct socket *so, struct sockopt *sopt)
2389 if (sopt->sopt_level != SOL_SOCKET) {
2390 if (so->so_proto && so->so_proto->pr_ctloutput)
2391 return ((*so->so_proto->pr_ctloutput)
2393 error = ENOPROTOOPT;
2395 switch (sopt->sopt_name) {
2397 case SO_ACCEPTFILTER:
2398 error = do_setopt_accept_filter(so, sopt);
2404 error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
2409 so->so_linger = l.l_linger;
2411 so->so_options |= SO_LINGER;
2413 so->so_options &= ~SO_LINGER;
2420 case SO_USELOOPBACK:
2430 error = sooptcopyin(sopt, &optval, sizeof optval,
2436 so->so_options |= sopt->sopt_name;
2438 so->so_options &= ~sopt->sopt_name;
2443 error = sooptcopyin(sopt, &optval, sizeof optval,
2445 if (optval < 1 || optval > rt_numfibs) {
2449 if ((so->so_proto->pr_domain->dom_family == PF_INET) ||
2450 (so->so_proto->pr_domain->dom_family == PF_ROUTE)) {
2451 so->so_fibnum = optval;
2452 /* Note: ignore error */
2453 if (so->so_proto && so->so_proto->pr_ctloutput)
2454 (*so->so_proto->pr_ctloutput)(so, sopt);
2463 error = sooptcopyin(sopt, &optval, sizeof optval,
2469 * Values < 1 make no sense for any of these options,
2477 switch (sopt->sopt_name) {
2480 if (sbreserve(sopt->sopt_name == SO_SNDBUF ?
2481 &so->so_snd : &so->so_rcv, (u_long)optval,
2482 so, curthread) == 0) {
2486 (sopt->sopt_name == SO_SNDBUF ? &so->so_snd :
2487 &so->so_rcv)->sb_flags &= ~SB_AUTOSIZE;
2491 * Make sure the low-water is never greater than the
2495 SOCKBUF_LOCK(&so->so_snd);
2496 so->so_snd.sb_lowat =
2497 (optval > so->so_snd.sb_hiwat) ?
2498 so->so_snd.sb_hiwat : optval;
2499 SOCKBUF_UNLOCK(&so->so_snd);
2502 SOCKBUF_LOCK(&so->so_rcv);
2503 so->so_rcv.sb_lowat =
2504 (optval > so->so_rcv.sb_hiwat) ?
2505 so->so_rcv.sb_hiwat : optval;
2506 SOCKBUF_UNLOCK(&so->so_rcv);
2513 #ifdef COMPAT_FREEBSD32
2514 if (SV_CURPROC_FLAG(SV_ILP32)) {
2515 struct timeval32 tv32;
2517 error = sooptcopyin(sopt, &tv32, sizeof tv32,
2519 CP(tv32, tv, tv_sec);
2520 CP(tv32, tv, tv_usec);
2523 error = sooptcopyin(sopt, &tv, sizeof tv,
2528 /* assert(hz > 0); */
2529 if (tv.tv_sec < 0 || tv.tv_sec > INT_MAX / hz ||
2530 tv.tv_usec < 0 || tv.tv_usec >= 1000000) {
2534 /* assert(tick > 0); */
2535 /* assert(ULONG_MAX - INT_MAX >= 1000000); */
2536 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick;
2537 if (val > INT_MAX) {
2541 if (val == 0 && tv.tv_usec != 0)
2544 switch (sopt->sopt_name) {
2546 so->so_snd.sb_timeo = val;
2549 so->so_rcv.sb_timeo = val;
2556 error = sooptcopyin(sopt, &extmac, sizeof extmac,
2560 error = mac_setsockopt_label(sopt->sopt_td->td_ucred,
2568 error = ENOPROTOOPT;
2571 if (error == 0 && so->so_proto != NULL &&
2572 so->so_proto->pr_ctloutput != NULL) {
2573 (void) ((*so->so_proto->pr_ctloutput)
2582 * Helper routine for getsockopt.
2585 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
2593 * Documented get behavior is that we always return a value, possibly
2594 * truncated to fit in the user's buffer. Traditional behavior is
2595 * that we always tell the user precisely how much we copied, rather
2596 * than something useful like the total amount we had available for
2597 * her. Note that this interface is not idempotent; the entire
2598 * answer must generated ahead of time.
2600 valsize = min(len, sopt->sopt_valsize);
2601 sopt->sopt_valsize = valsize;
2602 if (sopt->sopt_val != NULL) {
2603 if (sopt->sopt_td != NULL)
2604 error = copyout(buf, sopt->sopt_val, valsize);
2606 bcopy(buf, sopt->sopt_val, valsize);
2612 sogetopt(struct socket *so, struct sockopt *sopt)
2622 if (sopt->sopt_level != SOL_SOCKET) {
2623 if (so->so_proto && so->so_proto->pr_ctloutput) {
2624 return ((*so->so_proto->pr_ctloutput)
2627 return (ENOPROTOOPT);
2629 switch (sopt->sopt_name) {
2631 case SO_ACCEPTFILTER:
2632 error = do_getopt_accept_filter(so, sopt);
2637 l.l_onoff = so->so_options & SO_LINGER;
2638 l.l_linger = so->so_linger;
2640 error = sooptcopyout(sopt, &l, sizeof l);
2643 case SO_USELOOPBACK:
2655 optval = so->so_options & sopt->sopt_name;
2657 error = sooptcopyout(sopt, &optval, sizeof optval);
2661 optval = so->so_type;
2666 optval = so->so_error;
2672 optval = so->so_snd.sb_hiwat;
2676 optval = so->so_rcv.sb_hiwat;
2680 optval = so->so_snd.sb_lowat;
2684 optval = so->so_rcv.sb_lowat;
2689 optval = (sopt->sopt_name == SO_SNDTIMEO ?
2690 so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
2692 tv.tv_sec = optval / hz;
2693 tv.tv_usec = (optval % hz) * tick;
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;
2758 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
2760 soopt_getm(struct sockopt *sopt, struct mbuf **mp)
2762 struct mbuf *m, *m_prev;
2763 int sopt_size = sopt->sopt_valsize;
2765 MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_DATA);
2768 if (sopt_size > MLEN) {
2769 MCLGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT);
2770 if ((m->m_flags & M_EXT) == 0) {
2774 m->m_len = min(MCLBYTES, sopt_size);
2776 m->m_len = min(MLEN, sopt_size);
2778 sopt_size -= m->m_len;
2783 MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_DATA);
2788 if (sopt_size > MLEN) {
2789 MCLGET(m, sopt->sopt_td != NULL ? M_WAIT :
2791 if ((m->m_flags & M_EXT) == 0) {
2796 m->m_len = min(MCLBYTES, sopt_size);
2798 m->m_len = min(MLEN, sopt_size);
2800 sopt_size -= m->m_len;
2807 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */
2809 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
2811 struct mbuf *m0 = m;
2813 if (sopt->sopt_val == NULL)
2815 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
2816 if (sopt->sopt_td != NULL) {
2819 error = copyin(sopt->sopt_val, mtod(m, char *),
2826 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len);
2827 sopt->sopt_valsize -= m->m_len;
2828 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
2831 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
2832 panic("ip6_sooptmcopyin");
2836 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */
2838 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
2840 struct mbuf *m0 = m;
2843 if (sopt->sopt_val == NULL)
2845 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
2846 if (sopt->sopt_td != NULL) {
2849 error = copyout(mtod(m, char *), sopt->sopt_val,
2856 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len);
2857 sopt->sopt_valsize -= m->m_len;
2858 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
2859 valsize += m->m_len;
2863 /* enough soopt buffer should be given from user-land */
2867 sopt->sopt_valsize = valsize;
2872 * sohasoutofband(): protocol notifies socket layer of the arrival of new
2873 * out-of-band data, which will then notify socket consumers.
2876 sohasoutofband(struct socket *so)
2879 if (so->so_sigio != NULL)
2880 pgsigio(&so->so_sigio, SIGURG, 0);
2881 selwakeuppri(&so->so_rcv.sb_sel, PSOCK);
2885 sopoll(struct socket *so, int events, struct ucred *active_cred,
2889 return (so->so_proto->pr_usrreqs->pru_sopoll(so, events, active_cred,
2894 sopoll_generic(struct socket *so, int events, struct ucred *active_cred,
2899 SOCKBUF_LOCK(&so->so_snd);
2900 SOCKBUF_LOCK(&so->so_rcv);
2901 if (events & (POLLIN | POLLRDNORM))
2902 if (soreadabledata(so))
2903 revents |= events & (POLLIN | POLLRDNORM);
2905 if (events & (POLLOUT | POLLWRNORM))
2906 if (sowriteable(so))
2907 revents |= events & (POLLOUT | POLLWRNORM);
2909 if (events & (POLLPRI | POLLRDBAND))
2910 if (so->so_oobmark || (so->so_rcv.sb_state & SBS_RCVATMARK))
2911 revents |= events & (POLLPRI | POLLRDBAND);
2913 if ((events & POLLINIGNEOF) == 0) {
2914 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
2915 revents |= events & (POLLIN | POLLRDNORM);
2916 if (so->so_snd.sb_state & SBS_CANTSENDMORE)
2922 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2923 selrecord(td, &so->so_rcv.sb_sel);
2924 so->so_rcv.sb_flags |= SB_SEL;
2927 if (events & (POLLOUT | POLLWRNORM)) {
2928 selrecord(td, &so->so_snd.sb_sel);
2929 so->so_snd.sb_flags |= SB_SEL;
2933 SOCKBUF_UNLOCK(&so->so_rcv);
2934 SOCKBUF_UNLOCK(&so->so_snd);
2939 soo_kqfilter(struct file *fp, struct knote *kn)
2941 struct socket *so = kn->kn_fp->f_data;
2944 switch (kn->kn_filter) {
2946 if (so->so_options & SO_ACCEPTCONN)
2947 kn->kn_fop = &solisten_filtops;
2949 kn->kn_fop = &soread_filtops;
2953 kn->kn_fop = &sowrite_filtops;
2961 knlist_add(&sb->sb_sel.si_note, kn, 1);
2962 sb->sb_flags |= SB_KNOTE;
2968 * Some routines that return EOPNOTSUPP for entry points that are not
2969 * supported by a protocol. Fill in as needed.
2972 pru_accept_notsupp(struct socket *so, struct sockaddr **nam)
2979 pru_attach_notsupp(struct socket *so, int proto, struct thread *td)
2986 pru_bind_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
2993 pru_connect_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
3000 pru_connect2_notsupp(struct socket *so1, struct socket *so2)
3007 pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
3008 struct ifnet *ifp, struct thread *td)
3015 pru_disconnect_notsupp(struct socket *so)
3022 pru_listen_notsupp(struct socket *so, int backlog, struct thread *td)
3029 pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam)
3036 pru_rcvd_notsupp(struct socket *so, int flags)
3043 pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags)
3050 pru_send_notsupp(struct socket *so, int flags, struct mbuf *m,
3051 struct sockaddr *addr, struct mbuf *control, struct thread *td)
3058 * This isn't really a ``null'' operation, but it's the default one and
3059 * doesn't do anything destructive.
3062 pru_sense_null(struct socket *so, struct stat *sb)
3065 sb->st_blksize = so->so_snd.sb_hiwat;
3070 pru_shutdown_notsupp(struct socket *so)
3077 pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam)
3084 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
3085 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
3092 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
3093 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
3100 pru_sopoll_notsupp(struct socket *so, int events, struct ucred *cred,
3108 filt_sordetach(struct knote *kn)
3110 struct socket *so = kn->kn_fp->f_data;
3112 SOCKBUF_LOCK(&so->so_rcv);
3113 knlist_remove(&so->so_rcv.sb_sel.si_note, kn, 1);
3114 if (knlist_empty(&so->so_rcv.sb_sel.si_note))
3115 so->so_rcv.sb_flags &= ~SB_KNOTE;
3116 SOCKBUF_UNLOCK(&so->so_rcv);
3121 filt_soread(struct knote *kn, long hint)
3125 so = kn->kn_fp->f_data;
3126 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
3128 kn->kn_data = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
3129 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
3130 kn->kn_flags |= EV_EOF;
3131 kn->kn_fflags = so->so_error;
3133 } else if (so->so_error) /* temporary udp error */
3135 else if (kn->kn_sfflags & NOTE_LOWAT)
3136 return (kn->kn_data >= kn->kn_sdata);
3138 return (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat);
3142 filt_sowdetach(struct knote *kn)
3144 struct socket *so = kn->kn_fp->f_data;
3146 SOCKBUF_LOCK(&so->so_snd);
3147 knlist_remove(&so->so_snd.sb_sel.si_note, kn, 1);
3148 if (knlist_empty(&so->so_snd.sb_sel.si_note))
3149 so->so_snd.sb_flags &= ~SB_KNOTE;
3150 SOCKBUF_UNLOCK(&so->so_snd);
3155 filt_sowrite(struct knote *kn, long hint)
3159 so = kn->kn_fp->f_data;
3160 SOCKBUF_LOCK_ASSERT(&so->so_snd);
3161 kn->kn_data = sbspace(&so->so_snd);
3162 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
3163 kn->kn_flags |= EV_EOF;
3164 kn->kn_fflags = so->so_error;
3166 } else if (so->so_error) /* temporary udp error */
3168 else if (((so->so_state & SS_ISCONNECTED) == 0) &&
3169 (so->so_proto->pr_flags & PR_CONNREQUIRED))
3171 else if (kn->kn_sfflags & NOTE_LOWAT)
3172 return (kn->kn_data >= kn->kn_sdata);
3174 return (kn->kn_data >= so->so_snd.sb_lowat);
3179 filt_solisten(struct knote *kn, long hint)
3181 struct socket *so = kn->kn_fp->f_data;
3183 kn->kn_data = so->so_qlen;
3184 return (! TAILQ_EMPTY(&so->so_comp));
3188 socheckuid(struct socket *so, uid_t uid)
3193 if (so->so_cred->cr_uid != uid)
3199 sysctl_somaxconn(SYSCTL_HANDLER_ARGS)
3205 error = sysctl_handle_int(oidp, &val, 0, req);
3206 if (error || !req->newptr )
3209 if (val < 1 || val > USHRT_MAX)
3217 * These functions are used by protocols to notify the socket layer (and its
3218 * consumers) of state changes in the sockets driven by protocol-side events.
3222 * Procedures to manipulate state flags of socket and do appropriate wakeups.
3224 * Normal sequence from the active (originating) side is that
3225 * soisconnecting() is called during processing of connect() call, resulting
3226 * in an eventual call to soisconnected() if/when the connection is
3227 * established. When the connection is torn down soisdisconnecting() is
3228 * called during processing of disconnect() call, and soisdisconnected() is
3229 * called when the connection to the peer is totally severed. The semantics
3230 * of these routines are such that connectionless protocols can call
3231 * soisconnected() and soisdisconnected() only, bypassing the in-progress
3232 * calls when setting up a ``connection'' takes no time.
3234 * From the passive side, a socket is created with two queues of sockets:
3235 * so_incomp for connections in progress and so_comp for connections already
3236 * made and awaiting user acceptance. As a protocol is preparing incoming
3237 * connections, it creates a socket structure queued on so_incomp by calling
3238 * sonewconn(). When the connection is established, soisconnected() is
3239 * called, and transfers the socket structure to so_comp, making it available
3242 * If a socket is closed with sockets on either so_incomp or so_comp, these
3243 * sockets are dropped.
3245 * If higher-level protocols are implemented in the kernel, the wakeups done
3246 * here will sometimes cause software-interrupt process scheduling.
3249 soisconnecting(struct socket *so)
3253 so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
3254 so->so_state |= SS_ISCONNECTING;
3259 soisconnected(struct socket *so)
3261 struct socket *head;
3267 so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
3268 so->so_state |= SS_ISCONNECTED;
3270 if (head != NULL && (so->so_qstate & SQ_INCOMP)) {
3271 if ((so->so_options & SO_ACCEPTFILTER) == 0) {
3273 TAILQ_REMOVE(&head->so_incomp, so, so_list);
3275 so->so_qstate &= ~SQ_INCOMP;
3276 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
3278 so->so_qstate |= SQ_COMP;
3281 wakeup_one(&head->so_timeo);
3284 soupcall_set(so, SO_RCV,
3285 head->so_accf->so_accept_filter->accf_callback,
3286 head->so_accf->so_accept_filter_arg);
3287 so->so_options &= ~SO_ACCEPTFILTER;
3288 ret = head->so_accf->so_accept_filter->accf_callback(so,
3289 head->so_accf->so_accept_filter_arg, M_DONTWAIT);
3290 if (ret == SU_ISCONNECTED)
3291 soupcall_clear(so, SO_RCV);
3293 if (ret == SU_ISCONNECTED)
3300 wakeup(&so->so_timeo);
3306 soisdisconnecting(struct socket *so)
3310 * Note: This code assumes that SOCK_LOCK(so) and
3311 * SOCKBUF_LOCK(&so->so_rcv) are the same.
3313 SOCKBUF_LOCK(&so->so_rcv);
3314 so->so_state &= ~SS_ISCONNECTING;
3315 so->so_state |= SS_ISDISCONNECTING;
3316 so->so_rcv.sb_state |= SBS_CANTRCVMORE;
3317 sorwakeup_locked(so);
3318 SOCKBUF_LOCK(&so->so_snd);
3319 so->so_snd.sb_state |= SBS_CANTSENDMORE;
3320 sowwakeup_locked(so);
3321 wakeup(&so->so_timeo);
3325 soisdisconnected(struct socket *so)
3329 * Note: This code assumes that SOCK_LOCK(so) and
3330 * SOCKBUF_LOCK(&so->so_rcv) are the same.
3332 SOCKBUF_LOCK(&so->so_rcv);
3333 so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
3334 so->so_state |= SS_ISDISCONNECTED;
3335 so->so_rcv.sb_state |= SBS_CANTRCVMORE;
3336 sorwakeup_locked(so);
3337 SOCKBUF_LOCK(&so->so_snd);
3338 so->so_snd.sb_state |= SBS_CANTSENDMORE;
3339 sbdrop_locked(&so->so_snd, so->so_snd.sb_cc);
3340 sowwakeup_locked(so);
3341 wakeup(&so->so_timeo);
3345 * Make a copy of a sockaddr in a malloced buffer of type M_SONAME.
3348 sodupsockaddr(const struct sockaddr *sa, int mflags)
3350 struct sockaddr *sa2;
3352 sa2 = malloc(sa->sa_len, M_SONAME, mflags);
3354 bcopy(sa, sa2, sa->sa_len);
3359 * Register per-socket buffer upcalls.
3362 soupcall_set(struct socket *so, int which,
3363 int (*func)(struct socket *, void *, int), void *arg)
3375 panic("soupcall_set: bad which");
3377 SOCKBUF_LOCK_ASSERT(sb);
3379 /* XXX: accf_http actually wants to do this on purpose. */
3380 KASSERT(sb->sb_upcall == NULL, ("soupcall_set: overwriting upcall"));
3382 sb->sb_upcall = func;
3383 sb->sb_upcallarg = arg;
3384 sb->sb_flags |= SB_UPCALL;
3388 soupcall_clear(struct socket *so, int which)
3400 panic("soupcall_clear: bad which");
3402 SOCKBUF_LOCK_ASSERT(sb);
3403 KASSERT(sb->sb_upcall != NULL, ("soupcall_clear: no upcall to clear"));
3404 sb->sb_upcall = NULL;
3405 sb->sb_upcallarg = NULL;
3406 sb->sb_flags &= ~SB_UPCALL;
3410 * Create an external-format (``xsocket'') structure using the information in
3411 * the kernel-format socket structure pointed to by so. This is done to
3412 * reduce the spew of irrelevant information over this interface, to isolate
3413 * user code from changes in the kernel structure, and potentially to provide
3414 * information-hiding if we decide that some of this information should be
3415 * hidden from users.
3418 sotoxsocket(struct socket *so, struct xsocket *xso)
3421 xso->xso_len = sizeof *xso;
3423 xso->so_type = so->so_type;
3424 xso->so_options = so->so_options;
3425 xso->so_linger = so->so_linger;
3426 xso->so_state = so->so_state;
3427 xso->so_pcb = so->so_pcb;
3428 xso->xso_protocol = so->so_proto->pr_protocol;
3429 xso->xso_family = so->so_proto->pr_domain->dom_family;
3430 xso->so_qlen = so->so_qlen;
3431 xso->so_incqlen = so->so_incqlen;
3432 xso->so_qlimit = so->so_qlimit;
3433 xso->so_timeo = so->so_timeo;
3434 xso->so_error = so->so_error;
3435 xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
3436 xso->so_oobmark = so->so_oobmark;
3437 sbtoxsockbuf(&so->so_snd, &xso->so_snd);
3438 sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
3439 xso->so_uid = so->so_cred->cr_uid;
3444 * Socket accessor functions to provide external consumers with
3445 * a safe interface to socket state
3450 so_listeners_apply_all(struct socket *so, void (*func)(struct socket *, void *), void *arg)
3453 TAILQ_FOREACH(so, &so->so_comp, so_list)
3458 so_sockbuf_rcv(struct socket *so)
3461 return (&so->so_rcv);
3465 so_sockbuf_snd(struct socket *so)
3468 return (&so->so_snd);
3472 so_state_get(const struct socket *so)
3475 return (so->so_state);
3479 so_state_set(struct socket *so, int val)
3486 so_options_get(const struct socket *so)
3489 return (so->so_options);
3493 so_options_set(struct socket *so, int val)
3496 so->so_options = val;
3500 so_error_get(const struct socket *so)
3503 return (so->so_error);
3507 so_error_set(struct socket *so, int val)
3514 so_linger_get(const struct socket *so)
3517 return (so->so_linger);
3521 so_linger_set(struct socket *so, int val)
3524 so->so_linger = val;
3528 so_protosw_get(const struct socket *so)
3531 return (so->so_proto);
3535 so_protosw_set(struct socket *so, struct protosw *val)
3542 so_sorwakeup(struct socket *so)
3549 so_sowwakeup(struct socket *so)
3556 so_sorwakeup_locked(struct socket *so)
3559 sorwakeup_locked(so);
3563 so_sowwakeup_locked(struct socket *so)
3566 sowwakeup_locked(so);
3570 so_lock(struct socket *so)
3576 so_unlock(struct socket *so)