2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1988, 1990, 1993
5 * The Regents of the University of California.
6 * Copyright (c) 2004 The FreeBSD Foundation
7 * Copyright (c) 2004-2008 Robert N. M. Watson
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
38 * Comments on the socket life cycle:
40 * soalloc() sets of socket layer state for a socket, called only by
41 * socreate() and sonewconn(). Socket layer private.
43 * sodealloc() tears down socket layer state for a socket, called only by
44 * sofree() and sonewconn(). Socket layer private.
46 * pru_attach() associates protocol layer state with an allocated socket;
47 * called only once, may fail, aborting socket allocation. This is called
48 * from socreate() and sonewconn(). Socket layer private.
50 * pru_detach() disassociates protocol layer state from an attached socket,
51 * and will be called exactly once for sockets in which pru_attach() has
52 * been successfully called. If pru_attach() returned an error,
53 * pru_detach() will not be called. Socket layer private.
55 * pru_abort() and pru_close() notify the protocol layer that the last
56 * consumer of a socket is starting to tear down the socket, and that the
57 * protocol should terminate the connection. Historically, pru_abort() also
58 * detached protocol state from the socket state, but this is no longer the
61 * socreate() creates a socket and attaches protocol state. This is a public
62 * interface that may be used by socket layer consumers to create new
65 * sonewconn() creates a socket and attaches protocol state. This is a
66 * public interface that may be used by protocols to create new sockets when
67 * a new connection is received and will be available for accept() on a
70 * soclose() destroys a socket after possibly waiting for it to disconnect.
71 * This is a public interface that socket consumers should use to close and
72 * release a socket when done with it.
74 * soabort() destroys a socket without waiting for it to disconnect (used
75 * only for incoming connections that are already partially or fully
76 * connected). This is used internally by the socket layer when clearing
77 * listen socket queues (due to overflow or close on the listen socket), but
78 * is also a public interface protocols may use to abort connections in
79 * their incomplete listen queues should they no longer be required. Sockets
80 * placed in completed connection listen queues should not be aborted for
81 * reasons described in the comment above the soclose() implementation. This
82 * is not a general purpose close routine, and except in the specific
83 * circumstances described here, should not be used.
85 * sofree() will free a socket and its protocol state if all references on
86 * the socket have been released, and is the public interface to attempt to
87 * free a socket when a reference is removed. This is a socket layer private
90 * NOTE: In addition to socreate() and soclose(), which provide a single
91 * socket reference to the consumer to be managed as required, there are two
92 * calls to explicitly manage socket references, soref(), and sorele().
93 * Currently, these are generally required only when transitioning a socket
94 * from a listen queue to a file descriptor, in order to prevent garbage
95 * collection of the socket at an untimely moment. For a number of reasons,
96 * these interfaces are not preferred, and should be avoided.
98 * NOTE: With regard to VNETs the general rule is that callers do not set
99 * curvnet. Exceptions to this rule include soabort(), sodisconnect(),
100 * sofree() (and with that sorele(), sotryfree()), as well as sonewconn()
101 * and sorflush(), which are usually called from a pre-set VNET context.
102 * sopoll() currently does not need a VNET context to be set.
105 #include <sys/cdefs.h>
106 __FBSDID("$FreeBSD$");
108 #include "opt_inet.h"
109 #include "opt_inet6.h"
110 #include "opt_kern_tls.h"
111 #include "opt_sctp.h"
113 #include <sys/param.h>
114 #include <sys/systm.h>
115 #include <sys/capsicum.h>
116 #include <sys/fcntl.h>
117 #include <sys/limits.h>
118 #include <sys/lock.h>
120 #include <sys/malloc.h>
121 #include <sys/mbuf.h>
122 #include <sys/mutex.h>
123 #include <sys/domain.h>
124 #include <sys/file.h> /* for struct knote */
125 #include <sys/hhook.h>
126 #include <sys/kernel.h>
127 #include <sys/khelp.h>
128 #include <sys/ktls.h>
129 #include <sys/event.h>
130 #include <sys/eventhandler.h>
131 #include <sys/poll.h>
132 #include <sys/proc.h>
133 #include <sys/protosw.h>
134 #include <sys/sbuf.h>
135 #include <sys/socket.h>
136 #include <sys/socketvar.h>
137 #include <sys/resourcevar.h>
138 #include <net/route.h>
139 #include <sys/signalvar.h>
140 #include <sys/stat.h>
142 #include <sys/sysctl.h>
143 #include <sys/taskqueue.h>
146 #include <sys/unpcb.h>
147 #include <sys/jail.h>
148 #include <sys/syslog.h>
149 #include <netinet/in.h>
150 #include <netinet/in_pcb.h>
151 #include <netinet/tcp.h>
153 #include <net/vnet.h>
155 #include <security/mac/mac_framework.h>
159 #ifdef COMPAT_FREEBSD32
160 #include <sys/mount.h>
161 #include <sys/sysent.h>
162 #include <compat/freebsd32/freebsd32.h>
165 static int soreceive_rcvoob(struct socket *so, struct uio *uio,
167 static void so_rdknl_lock(void *);
168 static void so_rdknl_unlock(void *);
169 static void so_rdknl_assert_lock(void *, int);
170 static void so_wrknl_lock(void *);
171 static void so_wrknl_unlock(void *);
172 static void so_wrknl_assert_lock(void *, int);
174 static void filt_sordetach(struct knote *kn);
175 static int filt_soread(struct knote *kn, long hint);
176 static void filt_sowdetach(struct knote *kn);
177 static int filt_sowrite(struct knote *kn, long hint);
178 static int filt_soempty(struct knote *kn, long hint);
179 static int inline hhook_run_socket(struct socket *so, void *hctx, int32_t h_id);
180 fo_kqfilter_t soo_kqfilter;
182 static struct filterops soread_filtops = {
184 .f_detach = filt_sordetach,
185 .f_event = filt_soread,
187 static struct filterops sowrite_filtops = {
189 .f_detach = filt_sowdetach,
190 .f_event = filt_sowrite,
192 static struct filterops soempty_filtops = {
194 .f_detach = filt_sowdetach,
195 .f_event = filt_soempty,
198 so_gen_t so_gencnt; /* generation count for sockets */
200 MALLOC_DEFINE(M_SONAME, "soname", "socket name");
201 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
203 #define VNET_SO_ASSERT(so) \
204 VNET_ASSERT(curvnet != NULL, \
205 ("%s:%d curvnet is NULL, so=%p", __func__, __LINE__, (so)));
207 VNET_DEFINE(struct hhook_head *, socket_hhh[HHOOK_SOCKET_LAST + 1]);
208 #define V_socket_hhh VNET(socket_hhh)
211 * Limit on the number of connections in the listen queue waiting
213 * NB: The original sysctl somaxconn is still available but hidden
214 * to prevent confusion about the actual purpose of this number.
216 static u_int somaxconn = SOMAXCONN;
219 sysctl_somaxconn(SYSCTL_HANDLER_ARGS)
225 error = sysctl_handle_int(oidp, &val, 0, req);
226 if (error || !req->newptr )
230 * The purpose of the UINT_MAX / 3 limit, is so that the formula
232 * below, will not overflow.
235 if (val < 1 || val > UINT_MAX / 3)
241 SYSCTL_PROC(_kern_ipc, OID_AUTO, soacceptqueue,
242 CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, sizeof(int),
243 sysctl_somaxconn, "I",
244 "Maximum listen socket pending connection accept queue size");
245 SYSCTL_PROC(_kern_ipc, KIPC_SOMAXCONN, somaxconn,
246 CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_SKIP | CTLFLAG_MPSAFE, 0,
247 sizeof(int), sysctl_somaxconn, "I",
248 "Maximum listen socket pending connection accept queue size (compat)");
250 static int numopensockets;
251 SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD,
252 &numopensockets, 0, "Number of open sockets");
255 * accept_mtx locks down per-socket fields relating to accept queues. See
256 * socketvar.h for an annotation of the protected fields of struct socket.
258 struct mtx accept_mtx;
259 MTX_SYSINIT(accept_mtx, &accept_mtx, "accept", MTX_DEF);
262 * so_global_mtx protects so_gencnt, numopensockets, and the per-socket
265 static struct mtx so_global_mtx;
266 MTX_SYSINIT(so_global_mtx, &so_global_mtx, "so_glabel", MTX_DEF);
269 * General IPC sysctl name space, used by sockets and a variety of other IPC
272 SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
276 * Initialize the socket subsystem and set up the socket
279 static uma_zone_t socket_zone;
283 socket_zone_change(void *tag)
286 maxsockets = uma_zone_set_max(socket_zone, maxsockets);
290 socket_hhook_register(int subtype)
293 if (hhook_head_register(HHOOK_TYPE_SOCKET, subtype,
294 &V_socket_hhh[subtype],
295 HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
296 printf("%s: WARNING: unable to register hook\n", __func__);
300 socket_hhook_deregister(int subtype)
303 if (hhook_head_deregister(V_socket_hhh[subtype]) != 0)
304 printf("%s: WARNING: unable to deregister hook\n", __func__);
308 socket_init(void *tag)
311 socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL,
312 NULL, NULL, UMA_ALIGN_PTR, 0);
313 maxsockets = uma_zone_set_max(socket_zone, maxsockets);
314 uma_zone_set_warning(socket_zone, "kern.ipc.maxsockets limit reached");
315 EVENTHANDLER_REGISTER(maxsockets_change, socket_zone_change, NULL,
316 EVENTHANDLER_PRI_FIRST);
318 SYSINIT(socket, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, socket_init, NULL);
321 socket_vnet_init(const void *unused __unused)
325 /* We expect a contiguous range */
326 for (i = 0; i <= HHOOK_SOCKET_LAST; i++)
327 socket_hhook_register(i);
329 VNET_SYSINIT(socket_vnet_init, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY,
330 socket_vnet_init, NULL);
333 socket_vnet_uninit(const void *unused __unused)
337 for (i = 0; i <= HHOOK_SOCKET_LAST; i++)
338 socket_hhook_deregister(i);
340 VNET_SYSUNINIT(socket_vnet_uninit, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY,
341 socket_vnet_uninit, NULL);
344 * Initialise maxsockets. This SYSINIT must be run after
348 init_maxsockets(void *ignored)
351 TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
352 maxsockets = imax(maxsockets, maxfiles);
354 SYSINIT(param, SI_SUB_TUNABLES, SI_ORDER_ANY, init_maxsockets, NULL);
357 * Sysctl to get and set the maximum global sockets limit. Notify protocols
358 * of the change so that they can update their dependent limits as required.
361 sysctl_maxsockets(SYSCTL_HANDLER_ARGS)
363 int error, newmaxsockets;
365 newmaxsockets = maxsockets;
366 error = sysctl_handle_int(oidp, &newmaxsockets, 0, req);
367 if (error == 0 && req->newptr && newmaxsockets != maxsockets) {
368 if (newmaxsockets > maxsockets &&
369 newmaxsockets <= maxfiles) {
370 maxsockets = newmaxsockets;
371 EVENTHANDLER_INVOKE(maxsockets_change);
377 SYSCTL_PROC(_kern_ipc, OID_AUTO, maxsockets,
378 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, &maxsockets, 0,
379 sysctl_maxsockets, "IU",
380 "Maximum number of sockets available");
383 * Socket operation routines. These routines are called by the routines in
384 * sys_socket.c or from a system process, and implement the semantics of
385 * socket operations by switching out to the protocol specific routines.
389 * Get a socket structure from our zone, and initialize it. Note that it
390 * would probably be better to allocate socket and PCB at the same time, but
391 * I'm not convinced that all the protocols can be easily modified to do
394 * soalloc() returns a socket with a ref count of 0.
396 static struct socket *
397 soalloc(struct vnet *vnet)
401 so = uma_zalloc(socket_zone, M_NOWAIT | M_ZERO);
405 if (mac_socket_init(so, M_NOWAIT) != 0) {
406 uma_zfree(socket_zone, so);
410 if (khelp_init_osd(HELPER_CLASS_SOCKET, &so->osd)) {
411 uma_zfree(socket_zone, so);
416 * The socket locking protocol allows to lock 2 sockets at a time,
417 * however, the first one must be a listening socket. WITNESS lacks
418 * a feature to change class of an existing lock, so we use DUPOK.
420 mtx_init(&so->so_lock, "socket", NULL, MTX_DEF | MTX_DUPOK);
421 mtx_init(&so->so_snd_mtx, "so_snd", NULL, MTX_DEF);
422 mtx_init(&so->so_rcv_mtx, "so_rcv", NULL, MTX_DEF);
423 so->so_rcv.sb_sel = &so->so_rdsel;
424 so->so_snd.sb_sel = &so->so_wrsel;
425 sx_init(&so->so_snd_sx, "so_snd_sx");
426 sx_init(&so->so_rcv_sx, "so_rcv_sx");
427 TAILQ_INIT(&so->so_snd.sb_aiojobq);
428 TAILQ_INIT(&so->so_rcv.sb_aiojobq);
429 TASK_INIT(&so->so_snd.sb_aiotask, 0, soaio_snd, so);
430 TASK_INIT(&so->so_rcv.sb_aiotask, 0, soaio_rcv, so);
432 VNET_ASSERT(vnet != NULL, ("%s:%d vnet is NULL, so=%p",
433 __func__, __LINE__, so));
436 /* We shouldn't need the so_global_mtx */
437 if (hhook_run_socket(so, NULL, HHOOK_SOCKET_CREATE)) {
438 /* Do we need more comprehensive error returns? */
439 uma_zfree(socket_zone, so);
442 mtx_lock(&so_global_mtx);
443 so->so_gencnt = ++so_gencnt;
446 vnet->vnet_sockcnt++;
448 mtx_unlock(&so_global_mtx);
454 * Free the storage associated with a socket at the socket layer, tear down
455 * locks, labels, etc. All protocol state is assumed already to have been
456 * torn down (and possibly never set up) by the caller.
459 sodealloc(struct socket *so)
462 KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count));
463 KASSERT(so->so_pcb == NULL, ("sodealloc(): so_pcb != NULL"));
465 mtx_lock(&so_global_mtx);
466 so->so_gencnt = ++so_gencnt;
467 --numopensockets; /* Could be below, but faster here. */
469 VNET_ASSERT(so->so_vnet != NULL, ("%s:%d so_vnet is NULL, so=%p",
470 __func__, __LINE__, so));
471 so->so_vnet->vnet_sockcnt--;
473 mtx_unlock(&so_global_mtx);
475 mac_socket_destroy(so);
477 hhook_run_socket(so, NULL, HHOOK_SOCKET_CLOSE);
479 khelp_destroy_osd(&so->osd);
480 if (SOLISTENING(so)) {
481 if (so->sol_accept_filter != NULL)
482 accept_filt_setopt(so, NULL);
484 if (so->so_rcv.sb_hiwat)
485 (void)chgsbsize(so->so_cred->cr_uidinfo,
486 &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
487 if (so->so_snd.sb_hiwat)
488 (void)chgsbsize(so->so_cred->cr_uidinfo,
489 &so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
490 sx_destroy(&so->so_snd_sx);
491 sx_destroy(&so->so_rcv_sx);
492 mtx_destroy(&so->so_snd_mtx);
493 mtx_destroy(&so->so_rcv_mtx);
496 mtx_destroy(&so->so_lock);
497 uma_zfree(socket_zone, so);
501 * socreate returns a socket with a ref count of 1 and a file descriptor
502 * reference. The socket should be closed with soclose().
505 socreate(int dom, struct socket **aso, int type, int proto,
506 struct ucred *cred, struct thread *td)
513 prp = pffindproto(dom, proto, type);
515 prp = pffindtype(dom, type);
518 /* No support for domain. */
519 if (pffinddomain(dom) == NULL)
520 return (EAFNOSUPPORT);
521 /* No support for socket type. */
522 if (proto == 0 && type != 0)
524 return (EPROTONOSUPPORT);
526 if (prp->pr_usrreqs->pru_attach == NULL ||
527 prp->pr_usrreqs->pru_attach == pru_attach_notsupp)
528 return (EPROTONOSUPPORT);
530 if (IN_CAPABILITY_MODE(td) && (prp->pr_flags & PR_CAPATTACH) == 0)
533 if (prison_check_af(cred, prp->pr_domain->dom_family) != 0)
534 return (EPROTONOSUPPORT);
536 if (prp->pr_type != type)
538 so = soalloc(CRED_TO_VNET(cred));
543 so->so_cred = crhold(cred);
544 if ((prp->pr_domain->dom_family == PF_INET) ||
545 (prp->pr_domain->dom_family == PF_INET6) ||
546 (prp->pr_domain->dom_family == PF_ROUTE))
547 so->so_fibnum = td->td_proc->p_fibnum;
552 mac_socket_create(cred, so);
554 knlist_init(&so->so_rdsel.si_note, so, so_rdknl_lock, so_rdknl_unlock,
555 so_rdknl_assert_lock);
556 knlist_init(&so->so_wrsel.si_note, so, so_wrknl_lock, so_wrknl_unlock,
557 so_wrknl_assert_lock);
558 if ((prp->pr_flags & PR_SOCKBUF) == 0) {
559 so->so_snd.sb_mtx = &so->so_snd_mtx;
560 so->so_rcv.sb_mtx = &so->so_rcv_mtx;
563 * Auto-sizing of socket buffers is managed by the protocols and
564 * the appropriate flags must be set in the pru_attach function.
566 CURVNET_SET(so->so_vnet);
567 error = (*prp->pr_usrreqs->pru_attach)(so, proto, td);
579 static int regression_sonewconn_earlytest = 1;
580 SYSCTL_INT(_regression, OID_AUTO, sonewconn_earlytest, CTLFLAG_RW,
581 ®ression_sonewconn_earlytest, 0, "Perform early sonewconn limit test");
584 static struct timeval overinterval = { 60, 0 };
585 SYSCTL_TIMEVAL_SEC(_kern_ipc, OID_AUTO, sooverinterval, CTLFLAG_RW,
587 "Delay in seconds between warnings for listen socket overflows");
590 * When an attempt at a new connection is noted on a socket which supports
591 * accept(2), the protocol has two options:
592 * 1) Call legacy sonewconn() function, which would call protocol attach
593 * method, same as used for socket(2).
594 * 2) Call solisten_clone(), do attach that is specific to a cloned connection,
595 * and then call solisten_enqueue().
597 * Note: the ref count on the socket is 0 on return.
600 solisten_clone(struct socket *head)
606 const char localprefix[] = "local:";
607 char descrbuf[SUNPATHLEN + sizeof(localprefix)];
609 char addrbuf[INET6_ADDRSTRLEN];
611 char addrbuf[INET_ADDRSTRLEN];
616 over = (head->sol_qlen > 3 * head->sol_qlimit / 2);
618 if (regression_sonewconn_earlytest && over) {
622 head->sol_overcount++;
623 dolog = !!ratecheck(&head->sol_lastover, &overinterval);
626 * If we're going to log, copy the overflow count and queue
627 * length from the listen socket before dropping the lock.
628 * Also, reset the overflow count.
631 overcount = head->sol_overcount;
632 head->sol_overcount = 0;
633 qlen = head->sol_qlen;
635 SOLISTEN_UNLOCK(head);
639 * Try to print something descriptive about the
640 * socket for the error message.
642 sbuf_new(&descrsb, descrbuf, sizeof(descrbuf),
644 switch (head->so_proto->pr_domain->dom_family) {
645 #if defined(INET) || defined(INET6)
651 if (head->so_proto->pr_domain->dom_family ==
653 (sotoinpcb(head)->inp_inc.inc_flags &
656 &sotoinpcb(head)->inp_inc.inc6_laddr);
657 sbuf_printf(&descrsb, "[%s]", addrbuf);
663 sotoinpcb(head)->inp_inc.inc_laddr,
665 sbuf_cat(&descrsb, addrbuf);
668 sbuf_printf(&descrsb, ":%hu (proto %u)",
669 ntohs(sotoinpcb(head)->inp_inc.inc_lport),
670 head->so_proto->pr_protocol);
672 #endif /* INET || INET6 */
674 sbuf_cat(&descrsb, localprefix);
675 if (sotounpcb(head)->unp_addr != NULL)
677 sotounpcb(head)->unp_addr->sun_len -
678 offsetof(struct sockaddr_un,
684 sotounpcb(head)->unp_addr->sun_path,
687 sbuf_cat(&descrsb, "(unknown)");
692 * If we can't print something more specific, at least
693 * print the domain name.
695 if (sbuf_finish(&descrsb) != 0 ||
696 sbuf_len(&descrsb) <= 0) {
697 sbuf_clear(&descrsb);
699 head->so_proto->pr_domain->dom_name ?:
701 sbuf_finish(&descrsb);
703 KASSERT(sbuf_len(&descrsb) > 0,
704 ("%s: sbuf creation failed", __func__));
706 * Preserve the historic listen queue overflow log
707 * message, that starts with "sonewconn:". It has
708 * been known to sysadmins for years and also test
709 * sys/kern/sonewconn_overflow checks for it.
711 if (head->so_cred == 0) {
712 log(LOG_DEBUG, "sonewconn: pcb %p (%s): "
713 "Listen queue overflow: %i already in "
714 "queue awaiting acceptance (%d "
715 "occurrences)\n", head->so_pcb,
719 log(LOG_DEBUG, "sonewconn: pcb %p (%s): "
720 "Listen queue overflow: "
721 "%i already in queue awaiting acceptance "
722 "(%d occurrences), euid %d, rgid %d, jail %s\n",
723 head->so_pcb, sbuf_data(&descrsb), qlen,
724 overcount, head->so_cred->cr_uid,
725 head->so_cred->cr_rgid,
726 head->so_cred->cr_prison ?
727 head->so_cred->cr_prison->pr_name :
730 sbuf_delete(&descrsb);
737 SOLISTEN_UNLOCK(head);
738 VNET_ASSERT(head->so_vnet != NULL, ("%s: so %p vnet is NULL",
740 so = soalloc(head->so_vnet);
742 log(LOG_DEBUG, "%s: pcb %p: New socket allocation failure: "
743 "limit reached or out of memory\n",
744 __func__, head->so_pcb);
747 so->so_listen = head;
748 so->so_type = head->so_type;
749 so->so_options = head->so_options & ~SO_ACCEPTCONN;
750 so->so_linger = head->so_linger;
751 so->so_state = head->so_state;
752 so->so_fibnum = head->so_fibnum;
753 so->so_proto = head->so_proto;
754 so->so_cred = crhold(head->so_cred);
756 mac_socket_newconn(head, so);
758 knlist_init(&so->so_rdsel.si_note, so, so_rdknl_lock, so_rdknl_unlock,
759 so_rdknl_assert_lock);
760 knlist_init(&so->so_wrsel.si_note, so, so_wrknl_lock, so_wrknl_unlock,
761 so_wrknl_assert_lock);
762 VNET_SO_ASSERT(head);
763 if (soreserve(so, head->sol_sbsnd_hiwat, head->sol_sbrcv_hiwat)) {
765 log(LOG_DEBUG, "%s: pcb %p: soreserve() failed\n",
766 __func__, head->so_pcb);
769 so->so_rcv.sb_lowat = head->sol_sbrcv_lowat;
770 so->so_snd.sb_lowat = head->sol_sbsnd_lowat;
771 so->so_rcv.sb_timeo = head->sol_sbrcv_timeo;
772 so->so_snd.sb_timeo = head->sol_sbsnd_timeo;
773 so->so_rcv.sb_flags = head->sol_sbrcv_flags & SB_AUTOSIZE;
774 so->so_snd.sb_flags = head->sol_sbsnd_flags & SB_AUTOSIZE;
775 if ((so->so_proto->pr_flags & PR_SOCKBUF) == 0) {
776 so->so_snd.sb_mtx = &so->so_snd_mtx;
777 so->so_rcv.sb_mtx = &so->so_rcv_mtx;
783 /* Connstatus may be 0, or SS_ISCONFIRMING, or SS_ISCONNECTED. */
785 sonewconn(struct socket *head, int connstatus)
789 if ((so = solisten_clone(head)) == NULL)
792 if ((*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
794 log(LOG_DEBUG, "%s: pcb %p: pru_attach() failed\n",
795 __func__, head->so_pcb);
799 solisten_enqueue(so, connstatus);
805 * Enqueue socket cloned by solisten_clone() to the listen queue of the
806 * listener it has been cloned from.
809 solisten_enqueue(struct socket *so, int connstatus)
811 struct socket *head = so->so_listen;
813 MPASS(refcount_load(&so->so_count) == 0);
814 refcount_init(&so->so_count, 1);
817 if (head->sol_accept_filter != NULL)
819 so->so_state |= connstatus;
820 soref(head); /* A socket on (in)complete queue refs head. */
822 TAILQ_INSERT_TAIL(&head->sol_comp, so, so_list);
823 so->so_qstate = SQ_COMP;
825 solisten_wakeup(head); /* unlocks */
828 * Keep removing sockets from the head until there's room for
829 * us to insert on the tail. In pre-locking revisions, this
830 * was a simple if(), but as we could be racing with other
831 * threads and soabort() requires dropping locks, we must
832 * loop waiting for the condition to be true.
834 while (head->sol_incqlen > head->sol_qlimit) {
837 sp = TAILQ_FIRST(&head->sol_incomp);
838 TAILQ_REMOVE(&head->sol_incomp, sp, so_list);
841 sp->so_qstate = SQ_NONE;
842 sp->so_listen = NULL;
844 sorele_locked(head); /* does SOLISTEN_UNLOCK, head stays */
848 TAILQ_INSERT_TAIL(&head->sol_incomp, so, so_list);
849 so->so_qstate = SQ_INCOMP;
851 SOLISTEN_UNLOCK(head);
855 #if defined(SCTP) || defined(SCTP_SUPPORT)
857 * Socket part of sctp_peeloff(). Detach a new socket from an
858 * association. The new socket is returned with a reference.
860 * XXXGL: reduce copy-paste with solisten_clone().
863 sopeeloff(struct socket *head)
867 VNET_ASSERT(head->so_vnet != NULL, ("%s:%d so_vnet is NULL, head=%p",
868 __func__, __LINE__, head));
869 so = soalloc(head->so_vnet);
871 log(LOG_DEBUG, "%s: pcb %p: New socket allocation failure: "
872 "limit reached or out of memory\n",
873 __func__, head->so_pcb);
876 so->so_type = head->so_type;
877 so->so_options = head->so_options;
878 so->so_linger = head->so_linger;
879 so->so_state = (head->so_state & SS_NBIO) | SS_ISCONNECTED;
880 so->so_fibnum = head->so_fibnum;
881 so->so_proto = head->so_proto;
882 so->so_cred = crhold(head->so_cred);
884 mac_socket_newconn(head, so);
886 knlist_init(&so->so_rdsel.si_note, so, so_rdknl_lock, so_rdknl_unlock,
887 so_rdknl_assert_lock);
888 knlist_init(&so->so_wrsel.si_note, so, so_wrknl_lock, so_wrknl_unlock,
889 so_wrknl_assert_lock);
890 VNET_SO_ASSERT(head);
891 if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat)) {
893 log(LOG_DEBUG, "%s: pcb %p: soreserve() failed\n",
894 __func__, head->so_pcb);
897 if ((*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
899 log(LOG_DEBUG, "%s: pcb %p: pru_attach() failed\n",
900 __func__, head->so_pcb);
903 so->so_rcv.sb_lowat = head->so_rcv.sb_lowat;
904 so->so_snd.sb_lowat = head->so_snd.sb_lowat;
905 so->so_rcv.sb_timeo = head->so_rcv.sb_timeo;
906 so->so_snd.sb_timeo = head->so_snd.sb_timeo;
907 so->so_rcv.sb_flags |= head->so_rcv.sb_flags & SB_AUTOSIZE;
908 so->so_snd.sb_flags |= head->so_snd.sb_flags & SB_AUTOSIZE;
917 sobind(struct socket *so, struct sockaddr *nam, struct thread *td)
921 CURVNET_SET(so->so_vnet);
922 error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td);
928 sobindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
932 CURVNET_SET(so->so_vnet);
933 error = (*so->so_proto->pr_usrreqs->pru_bindat)(fd, so, nam, td);
939 * solisten() transitions a socket from a non-listening state to a listening
940 * state, but can also be used to update the listen queue depth on an
941 * existing listen socket. The protocol will call back into the sockets
942 * layer using solisten_proto_check() and solisten_proto() to check and set
943 * socket-layer listen state. Call backs are used so that the protocol can
944 * acquire both protocol and socket layer locks in whatever order is required
947 * Protocol implementors are advised to hold the socket lock across the
948 * socket-layer test and set to avoid races at the socket layer.
951 solisten(struct socket *so, int backlog, struct thread *td)
955 CURVNET_SET(so->so_vnet);
956 error = (*so->so_proto->pr_usrreqs->pru_listen)(so, backlog, td);
962 * Prepare for a call to solisten_proto(). Acquire all socket buffer locks in
963 * order to interlock with socket I/O.
966 solisten_proto_check(struct socket *so)
968 SOCK_LOCK_ASSERT(so);
970 if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
971 SS_ISDISCONNECTING)) != 0)
975 * Sleeping is not permitted here, so simply fail if userspace is
976 * attempting to transmit or receive on the socket. This kind of
977 * transient failure is not ideal, but it should occur only if userspace
978 * is misusing the socket interfaces.
980 if (!sx_try_xlock(&so->so_snd_sx))
982 if (!sx_try_xlock(&so->so_rcv_sx)) {
983 sx_xunlock(&so->so_snd_sx);
986 mtx_lock(&so->so_snd_mtx);
987 mtx_lock(&so->so_rcv_mtx);
989 /* Interlock with soo_aio_queue(). */
990 if (!SOLISTENING(so) &&
991 ((so->so_snd.sb_flags & (SB_AIO | SB_AIO_RUNNING)) != 0 ||
992 (so->so_rcv.sb_flags & (SB_AIO | SB_AIO_RUNNING)) != 0)) {
993 solisten_proto_abort(so);
1000 * Undo the setup done by solisten_proto_check().
1003 solisten_proto_abort(struct socket *so)
1005 mtx_unlock(&so->so_snd_mtx);
1006 mtx_unlock(&so->so_rcv_mtx);
1007 sx_xunlock(&so->so_snd_sx);
1008 sx_xunlock(&so->so_rcv_sx);
1012 solisten_proto(struct socket *so, int backlog)
1014 int sbrcv_lowat, sbsnd_lowat;
1015 u_int sbrcv_hiwat, sbsnd_hiwat;
1016 short sbrcv_flags, sbsnd_flags;
1017 sbintime_t sbrcv_timeo, sbsnd_timeo;
1019 SOCK_LOCK_ASSERT(so);
1020 KASSERT((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1021 SS_ISDISCONNECTING)) == 0,
1022 ("%s: bad socket state %p", __func__, so));
1024 if (SOLISTENING(so))
1028 * Change this socket to listening state.
1030 sbrcv_lowat = so->so_rcv.sb_lowat;
1031 sbsnd_lowat = so->so_snd.sb_lowat;
1032 sbrcv_hiwat = so->so_rcv.sb_hiwat;
1033 sbsnd_hiwat = so->so_snd.sb_hiwat;
1034 sbrcv_flags = so->so_rcv.sb_flags;
1035 sbsnd_flags = so->so_snd.sb_flags;
1036 sbrcv_timeo = so->so_rcv.sb_timeo;
1037 sbsnd_timeo = so->so_snd.sb_timeo;
1039 sbdestroy(so, SO_SND);
1040 sbdestroy(so, SO_RCV);
1044 sizeof(struct socket) - offsetof(struct socket, so_rcv));
1047 so->sol_sbrcv_lowat = sbrcv_lowat;
1048 so->sol_sbsnd_lowat = sbsnd_lowat;
1049 so->sol_sbrcv_hiwat = sbrcv_hiwat;
1050 so->sol_sbsnd_hiwat = sbsnd_hiwat;
1051 so->sol_sbrcv_flags = sbrcv_flags;
1052 so->sol_sbsnd_flags = sbsnd_flags;
1053 so->sol_sbrcv_timeo = sbrcv_timeo;
1054 so->sol_sbsnd_timeo = sbsnd_timeo;
1056 so->sol_qlen = so->sol_incqlen = 0;
1057 TAILQ_INIT(&so->sol_incomp);
1058 TAILQ_INIT(&so->sol_comp);
1060 so->sol_accept_filter = NULL;
1061 so->sol_accept_filter_arg = NULL;
1062 so->sol_accept_filter_str = NULL;
1064 so->sol_upcall = NULL;
1065 so->sol_upcallarg = NULL;
1067 so->so_options |= SO_ACCEPTCONN;
1070 if (backlog < 0 || backlog > somaxconn)
1071 backlog = somaxconn;
1072 so->sol_qlimit = backlog;
1074 mtx_unlock(&so->so_snd_mtx);
1075 mtx_unlock(&so->so_rcv_mtx);
1076 sx_xunlock(&so->so_snd_sx);
1077 sx_xunlock(&so->so_rcv_sx);
1081 * Wakeup listeners/subsystems once we have a complete connection.
1082 * Enters with lock, returns unlocked.
1085 solisten_wakeup(struct socket *sol)
1088 if (sol->sol_upcall != NULL)
1089 (void )sol->sol_upcall(sol, sol->sol_upcallarg, M_NOWAIT);
1091 selwakeuppri(&sol->so_rdsel, PSOCK);
1092 KNOTE_LOCKED(&sol->so_rdsel.si_note, 0);
1094 SOLISTEN_UNLOCK(sol);
1095 wakeup_one(&sol->sol_comp);
1096 if ((sol->so_state & SS_ASYNC) && sol->so_sigio != NULL)
1097 pgsigio(&sol->so_sigio, SIGIO, 0);
1101 * Return single connection off a listening socket queue. Main consumer of
1102 * the function is kern_accept4(). Some modules, that do their own accept
1103 * management also use the function. The socket reference held by the
1104 * listen queue is handed to the caller.
1106 * Listening socket must be locked on entry and is returned unlocked on
1108 * The flags argument is set of accept4(2) flags and ACCEPT4_INHERIT.
1111 solisten_dequeue(struct socket *head, struct socket **ret, int flags)
1116 SOLISTEN_LOCK_ASSERT(head);
1118 while (!(head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->sol_comp) &&
1119 head->so_error == 0) {
1120 error = msleep(&head->sol_comp, SOCK_MTX(head), PSOCK | PCATCH,
1123 SOLISTEN_UNLOCK(head);
1127 if (head->so_error) {
1128 error = head->so_error;
1130 } else if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->sol_comp))
1131 error = EWOULDBLOCK;
1135 SOLISTEN_UNLOCK(head);
1138 so = TAILQ_FIRST(&head->sol_comp);
1140 KASSERT(so->so_qstate == SQ_COMP,
1141 ("%s: so %p not SQ_COMP", __func__, so));
1143 so->so_qstate = SQ_NONE;
1144 so->so_listen = NULL;
1145 TAILQ_REMOVE(&head->sol_comp, so, so_list);
1146 if (flags & ACCEPT4_INHERIT)
1147 so->so_state |= (head->so_state & SS_NBIO);
1149 so->so_state |= (flags & SOCK_NONBLOCK) ? SS_NBIO : 0;
1151 sorele_locked(head);
1158 * Free socket upon release of the very last reference.
1161 sofree(struct socket *so)
1163 struct protosw *pr = so->so_proto;
1165 SOCK_LOCK_ASSERT(so);
1166 KASSERT(refcount_load(&so->so_count) == 0,
1167 ("%s: so %p has references", __func__, so));
1168 KASSERT(SOLISTENING(so) || so->so_qstate == SQ_NONE,
1169 ("%s: so %p is on listen queue", __func__, so));
1173 if (so->so_dtor != NULL)
1177 if ((pr->pr_flags & PR_RIGHTS) && !SOLISTENING(so)) {
1178 MPASS(pr->pr_domain->dom_dispose != NULL);
1179 (*pr->pr_domain->dom_dispose)(so);
1181 if (pr->pr_usrreqs->pru_detach != NULL)
1182 (*pr->pr_usrreqs->pru_detach)(so);
1185 * From this point on, we assume that no other references to this
1186 * socket exist anywhere else in the stack. Therefore, no locks need
1187 * to be acquired or held.
1189 if (!(pr->pr_flags & PR_SOCKBUF) && !SOLISTENING(so)) {
1190 sbdestroy(so, SO_SND);
1191 sbdestroy(so, SO_RCV);
1193 seldrain(&so->so_rdsel);
1194 seldrain(&so->so_wrsel);
1195 knlist_destroy(&so->so_rdsel.si_note);
1196 knlist_destroy(&so->so_wrsel.si_note);
1201 * Release a reference on a socket while holding the socket lock.
1202 * Unlocks the socket lock before returning.
1205 sorele_locked(struct socket *so)
1207 SOCK_LOCK_ASSERT(so);
1208 if (refcount_release(&so->so_count))
1215 * Close a socket on last file table reference removal. Initiate disconnect
1216 * if connected. Free socket when disconnect complete.
1218 * This function will sorele() the socket. Note that soclose() may be called
1219 * prior to the ref count reaching zero. The actual socket structure will
1220 * not be freed until the ref count reaches zero.
1223 soclose(struct socket *so)
1225 struct accept_queue lqueue;
1227 bool listening, last __diagused;
1229 CURVNET_SET(so->so_vnet);
1230 funsetown(&so->so_sigio);
1231 if (so->so_state & SS_ISCONNECTED) {
1232 if ((so->so_state & SS_ISDISCONNECTING) == 0) {
1233 error = sodisconnect(so);
1235 if (error == ENOTCONN)
1241 if ((so->so_options & SO_LINGER) != 0 && so->so_linger != 0) {
1242 if ((so->so_state & SS_ISDISCONNECTING) &&
1243 (so->so_state & SS_NBIO))
1245 while (so->so_state & SS_ISCONNECTED) {
1246 error = tsleep(&so->so_timeo,
1247 PSOCK | PCATCH, "soclos",
1248 so->so_linger * hz);
1256 if (so->so_proto->pr_usrreqs->pru_close != NULL)
1257 (*so->so_proto->pr_usrreqs->pru_close)(so);
1260 if ((listening = SOLISTENING(so))) {
1263 TAILQ_INIT(&lqueue);
1264 TAILQ_SWAP(&lqueue, &so->sol_incomp, socket, so_list);
1265 TAILQ_CONCAT(&lqueue, &so->sol_comp, so_list);
1267 so->sol_qlen = so->sol_incqlen = 0;
1269 TAILQ_FOREACH(sp, &lqueue, so_list) {
1271 sp->so_qstate = SQ_NONE;
1272 sp->so_listen = NULL;
1274 last = refcount_release(&so->so_count);
1275 KASSERT(!last, ("%s: released last reference for %p",
1281 struct socket *sp, *tsp;
1283 TAILQ_FOREACH_SAFE(sp, &lqueue, so_list, tsp)
1291 * soabort() is used to abruptly tear down a connection, such as when a
1292 * resource limit is reached (listen queue depth exceeded), or if a listen
1293 * socket is closed while there are sockets waiting to be accepted.
1295 * This interface is tricky, because it is called on an unreferenced socket,
1296 * and must be called only by a thread that has actually removed the socket
1297 * from the listen queue it was on. Likely this thread holds the last
1298 * reference on the socket and soabort() will proceed with sofree(). But
1299 * it might be not the last, as the sockets on the listen queues are seen
1300 * from the protocol side.
1302 * This interface will call into the protocol code, so must not be called
1303 * with any socket locks held. Protocols do call it while holding their own
1304 * recursible protocol mutexes, but this is something that should be subject
1305 * to review in the future.
1307 * Usually socket should have a single reference left, but this is not a
1308 * requirement. In the past, when we have had named references for file
1309 * descriptor and protocol, we asserted that none of them are being held.
1312 soabort(struct socket *so)
1317 if (so->so_proto->pr_usrreqs->pru_abort != NULL)
1318 (*so->so_proto->pr_usrreqs->pru_abort)(so);
1324 soaccept(struct socket *so, struct sockaddr **nam)
1328 CURVNET_SET(so->so_vnet);
1329 error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam);
1335 soconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
1338 return (soconnectat(AT_FDCWD, so, nam, td));
1342 soconnectat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
1346 CURVNET_SET(so->so_vnet);
1348 * If protocol is connection-based, can only connect once.
1349 * Otherwise, if connected, try to disconnect first. This allows
1350 * user to disconnect by connecting to, e.g., a null address.
1352 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
1353 ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
1354 (error = sodisconnect(so)))) {
1358 * Prevent accumulated error from previous connection from
1362 if (fd == AT_FDCWD) {
1363 error = (*so->so_proto->pr_usrreqs->pru_connect)(so,
1366 error = (*so->so_proto->pr_usrreqs->pru_connectat)(fd,
1376 soconnect2(struct socket *so1, struct socket *so2)
1380 CURVNET_SET(so1->so_vnet);
1381 error = (*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2);
1387 sodisconnect(struct socket *so)
1391 if ((so->so_state & SS_ISCONNECTED) == 0)
1393 if (so->so_state & SS_ISDISCONNECTING)
1396 error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so);
1401 sosend_dgram(struct socket *so, struct sockaddr *addr, struct uio *uio,
1402 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1406 int clen = 0, error, dontroute;
1408 KASSERT(so->so_type == SOCK_DGRAM, ("sosend_dgram: !SOCK_DGRAM"));
1409 KASSERT(so->so_proto->pr_flags & PR_ATOMIC,
1410 ("sosend_dgram: !PR_ATOMIC"));
1413 resid = uio->uio_resid;
1415 resid = top->m_pkthdr.len;
1417 * In theory resid should be unsigned. However, space must be
1418 * signed, as it might be less than 0 if we over-committed, and we
1419 * must use a signed comparison of space and resid. On the other
1420 * hand, a negative resid causes us to loop sending 0-length
1421 * segments to the protocol.
1429 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0;
1431 td->td_ru.ru_msgsnd++;
1432 if (control != NULL)
1433 clen = control->m_len;
1435 SOCKBUF_LOCK(&so->so_snd);
1436 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1437 SOCKBUF_UNLOCK(&so->so_snd);
1442 error = so->so_error;
1444 SOCKBUF_UNLOCK(&so->so_snd);
1447 if ((so->so_state & SS_ISCONNECTED) == 0) {
1449 * `sendto' and `sendmsg' is allowed on a connection-based
1450 * socket if it supports implied connect. Return ENOTCONN if
1451 * not connected and no address is supplied.
1453 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1454 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1455 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1456 !(resid == 0 && clen != 0)) {
1457 SOCKBUF_UNLOCK(&so->so_snd);
1461 } else if (addr == NULL) {
1462 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1465 error = EDESTADDRREQ;
1466 SOCKBUF_UNLOCK(&so->so_snd);
1472 * Do we need MSG_OOB support in SOCK_DGRAM? Signs here may be a
1473 * problem and need fixing.
1475 space = sbspace(&so->so_snd);
1476 if (flags & MSG_OOB)
1479 SOCKBUF_UNLOCK(&so->so_snd);
1480 if (resid > space) {
1486 if (flags & MSG_EOR)
1487 top->m_flags |= M_EOR;
1490 * Copy the data from userland into a mbuf chain.
1491 * If no data is to be copied in, a single empty mbuf
1494 top = m_uiotombuf(uio, M_WAITOK, space, max_hdr,
1495 (M_PKTHDR | ((flags & MSG_EOR) ? M_EOR : 0)));
1497 error = EFAULT; /* only possible error */
1500 space -= resid - uio->uio_resid;
1501 resid = uio->uio_resid;
1503 KASSERT(resid == 0, ("sosend_dgram: resid != 0"));
1505 * XXXRW: Frobbing SO_DONTROUTE here is even worse without sblock
1510 so->so_options |= SO_DONTROUTE;
1514 * XXX all the SBS_CANTSENDMORE checks previously done could be out
1515 * of date. We could have received a reset packet in an interrupt or
1516 * maybe we slept while doing page faults in uiomove() etc. We could
1517 * probably recheck again inside the locking protection here, but
1518 * there are probably other places that this also happens. We must
1522 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1523 (flags & MSG_OOB) ? PRUS_OOB :
1525 * If the user set MSG_EOF, the protocol understands this flag and
1526 * nothing left to send then use PRU_SEND_EOF instead of PRU_SEND.
1528 ((flags & MSG_EOF) &&
1529 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1532 /* If there is more to send set PRUS_MORETOCOME */
1533 (flags & MSG_MORETOCOME) ||
1534 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1535 top, addr, control, td);
1538 so->so_options &= ~SO_DONTROUTE;
1547 if (control != NULL)
1553 * Send on a socket. If send must go all at once and message is larger than
1554 * send buffering, then hard error. Lock against other senders. If must go
1555 * all at once and not enough room now, then inform user that this would
1556 * block and do nothing. Otherwise, if nonblocking, send as much as
1557 * possible. The data to be sent is described by "uio" if nonzero, otherwise
1558 * by the mbuf chain "top" (which must be null if uio is not). Data provided
1559 * in mbuf chain must be small enough to send all at once.
1561 * Returns nonzero on error, timeout or signal; callers must check for short
1562 * counts if EINTR/ERESTART are returned. Data and control buffers are freed
1566 sosend_generic(struct socket *so, struct sockaddr *addr, struct uio *uio,
1567 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1571 int clen = 0, error, dontroute;
1572 int atomic = sosendallatonce(so) || top;
1575 struct ktls_session *tls;
1576 int tls_enq_cnt, tls_pruflag;
1580 tls_rtype = TLS_RLTYPE_APP;
1583 resid = uio->uio_resid;
1584 else if ((top->m_flags & M_PKTHDR) != 0)
1585 resid = top->m_pkthdr.len;
1587 resid = m_length(top, NULL);
1589 * In theory resid should be unsigned. However, space must be
1590 * signed, as it might be less than 0 if we over-committed, and we
1591 * must use a signed comparison of space and resid. On the other
1592 * hand, a negative resid causes us to loop sending 0-length
1593 * segments to the protocol.
1595 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
1596 * type sockets since that's an error.
1598 if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
1604 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
1605 (so->so_proto->pr_flags & PR_ATOMIC);
1607 td->td_ru.ru_msgsnd++;
1608 if (control != NULL)
1609 clen = control->m_len;
1611 error = SOCK_IO_SEND_LOCK(so, SBLOCKWAIT(flags));
1617 tls = ktls_hold(so->so_snd.sb_tls_info);
1619 if (tls->mode == TCP_TLS_MODE_SW)
1620 tls_pruflag = PRUS_NOTREADY;
1622 if (control != NULL) {
1623 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1625 if (clen >= sizeof(*cm) &&
1626 cm->cmsg_type == TLS_SET_RECORD_TYPE) {
1627 tls_rtype = *((uint8_t *)CMSG_DATA(cm));
1635 if (resid == 0 && !ktls_permit_empty_frames(tls)) {
1644 SOCKBUF_LOCK(&so->so_snd);
1645 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1646 SOCKBUF_UNLOCK(&so->so_snd);
1651 error = so->so_error;
1653 SOCKBUF_UNLOCK(&so->so_snd);
1656 if ((so->so_state & SS_ISCONNECTED) == 0) {
1658 * `sendto' and `sendmsg' is allowed on a connection-
1659 * based socket if it supports implied connect.
1660 * Return ENOTCONN if not connected and no address is
1663 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1664 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1665 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1666 !(resid == 0 && clen != 0)) {
1667 SOCKBUF_UNLOCK(&so->so_snd);
1671 } else if (addr == NULL) {
1672 SOCKBUF_UNLOCK(&so->so_snd);
1673 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1676 error = EDESTADDRREQ;
1680 space = sbspace(&so->so_snd);
1681 if (flags & MSG_OOB)
1683 if ((atomic && resid > so->so_snd.sb_hiwat) ||
1684 clen > so->so_snd.sb_hiwat) {
1685 SOCKBUF_UNLOCK(&so->so_snd);
1689 if (space < resid + clen &&
1690 (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1691 if ((so->so_state & SS_NBIO) ||
1692 (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0) {
1693 SOCKBUF_UNLOCK(&so->so_snd);
1694 error = EWOULDBLOCK;
1697 error = sbwait(so, SO_SND);
1698 SOCKBUF_UNLOCK(&so->so_snd);
1703 SOCKBUF_UNLOCK(&so->so_snd);
1708 if (flags & MSG_EOR)
1709 top->m_flags |= M_EOR;
1712 ktls_frame(top, tls, &tls_enq_cnt,
1714 tls_rtype = TLS_RLTYPE_APP;
1719 * Copy the data from userland into a mbuf
1720 * chain. If resid is 0, which can happen
1721 * only if we have control to send, then
1722 * a single empty mbuf is returned. This
1723 * is a workaround to prevent protocol send
1728 top = m_uiotombuf(uio, M_WAITOK, space,
1729 tls->params.max_frame_len,
1731 ((flags & MSG_EOR) ? M_EOR : 0));
1733 ktls_frame(top, tls,
1734 &tls_enq_cnt, tls_rtype);
1736 tls_rtype = TLS_RLTYPE_APP;
1739 top = m_uiotombuf(uio, M_WAITOK, space,
1740 (atomic ? max_hdr : 0),
1741 (atomic ? M_PKTHDR : 0) |
1742 ((flags & MSG_EOR) ? M_EOR : 0));
1744 error = EFAULT; /* only possible error */
1747 space -= resid - uio->uio_resid;
1748 resid = uio->uio_resid;
1752 so->so_options |= SO_DONTROUTE;
1756 * XXX all the SBS_CANTSENDMORE checks previously
1757 * done could be out of date. We could have received
1758 * a reset packet in an interrupt or maybe we slept
1759 * while doing page faults in uiomove() etc. We
1760 * could probably recheck again inside the locking
1761 * protection here, but there are probably other
1762 * places that this also happens. We must rethink
1767 pru_flag = (flags & MSG_OOB) ? PRUS_OOB :
1769 * If the user set MSG_EOF, the protocol understands
1770 * this flag and nothing left to send then use
1771 * PRU_SEND_EOF instead of PRU_SEND.
1773 ((flags & MSG_EOF) &&
1774 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1777 /* If there is more to send set PRUS_MORETOCOME. */
1778 (flags & MSG_MORETOCOME) ||
1779 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0;
1782 pru_flag |= tls_pruflag;
1785 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1786 pru_flag, top, addr, control, td);
1790 so->so_options &= ~SO_DONTROUTE;
1795 if (tls != NULL && tls->mode == TCP_TLS_MODE_SW) {
1801 ktls_enqueue(top, so, tls_enq_cnt);
1810 } while (resid && space > 0);
1814 SOCK_IO_SEND_UNLOCK(so);
1822 if (control != NULL)
1828 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
1829 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1833 CURVNET_SET(so->so_vnet);
1834 error = so->so_proto->pr_usrreqs->pru_sosend(so, addr, uio,
1835 top, control, flags, td);
1841 * The part of soreceive() that implements reading non-inline out-of-band
1842 * data from a socket. For more complete comments, see soreceive(), from
1843 * which this code originated.
1845 * Note that soreceive_rcvoob(), unlike the remainder of soreceive(), is
1846 * unable to return an mbuf chain to the caller.
1849 soreceive_rcvoob(struct socket *so, struct uio *uio, int flags)
1851 struct protosw *pr = so->so_proto;
1855 KASSERT(flags & MSG_OOB, ("soreceive_rcvoob: (flags & MSG_OOB) == 0"));
1858 m = m_get(M_WAITOK, MT_DATA);
1859 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK);
1863 error = uiomove(mtod(m, void *),
1864 (int) min(uio->uio_resid, m->m_len), uio);
1866 } while (uio->uio_resid && error == 0 && m);
1874 * Following replacement or removal of the first mbuf on the first mbuf chain
1875 * of a socket buffer, push necessary state changes back into the socket
1876 * buffer so that other consumers see the values consistently. 'nextrecord'
1877 * is the callers locally stored value of the original value of
1878 * sb->sb_mb->m_nextpkt which must be restored when the lead mbuf changes.
1879 * NOTE: 'nextrecord' may be NULL.
1881 static __inline void
1882 sockbuf_pushsync(struct sockbuf *sb, struct mbuf *nextrecord)
1885 SOCKBUF_LOCK_ASSERT(sb);
1887 * First, update for the new value of nextrecord. If necessary, make
1888 * it the first record.
1890 if (sb->sb_mb != NULL)
1891 sb->sb_mb->m_nextpkt = nextrecord;
1893 sb->sb_mb = nextrecord;
1896 * Now update any dependent socket buffer fields to reflect the new
1897 * state. This is an expanded inline of SB_EMPTY_FIXUP(), with the
1898 * addition of a second clause that takes care of the case where
1899 * sb_mb has been updated, but remains the last record.
1901 if (sb->sb_mb == NULL) {
1902 sb->sb_mbtail = NULL;
1903 sb->sb_lastrecord = NULL;
1904 } else if (sb->sb_mb->m_nextpkt == NULL)
1905 sb->sb_lastrecord = sb->sb_mb;
1909 * Implement receive operations on a socket. We depend on the way that
1910 * records are added to the sockbuf by sbappend. In particular, each record
1911 * (mbufs linked through m_next) must begin with an address if the protocol
1912 * so specifies, followed by an optional mbuf or mbufs containing ancillary
1913 * data, and then zero or more mbufs of data. In order to allow parallelism
1914 * between network receive and copying to user space, as well as avoid
1915 * sleeping with a mutex held, we release the socket buffer mutex during the
1916 * user space copy. Although the sockbuf is locked, new data may still be
1917 * appended, and thus we must maintain consistency of the sockbuf during that
1920 * The caller may receive the data as a single mbuf chain by supplying an
1921 * mbuf **mp0 for use in returning the chain. The uio is then used only for
1922 * the count in uio_resid.
1925 soreceive_generic(struct socket *so, struct sockaddr **psa, struct uio *uio,
1926 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1928 struct mbuf *m, **mp;
1929 int flags, error, offset;
1931 struct protosw *pr = so->so_proto;
1932 struct mbuf *nextrecord;
1934 ssize_t orig_resid = uio->uio_resid;
1935 bool report_real_len = false;
1940 if (controlp != NULL)
1942 if (flagsp != NULL) {
1943 report_real_len = *flagsp & MSG_TRUNC;
1944 *flagsp &= ~MSG_TRUNC;
1945 flags = *flagsp &~ MSG_EOR;
1948 if (flags & MSG_OOB)
1949 return (soreceive_rcvoob(so, uio, flags));
1952 if ((pr->pr_flags & PR_WANTRCVD) && (so->so_state & SS_ISCONFIRMING)
1953 && uio->uio_resid) {
1955 (*pr->pr_usrreqs->pru_rcvd)(so, 0);
1958 error = SOCK_IO_RECV_LOCK(so, SBLOCKWAIT(flags));
1963 SOCKBUF_LOCK(&so->so_rcv);
1964 m = so->so_rcv.sb_mb;
1966 * If we have less data than requested, block awaiting more (subject
1967 * to any timeout) if:
1968 * 1. the current count is less than the low water mark, or
1969 * 2. MSG_DONTWAIT is not set
1971 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
1972 sbavail(&so->so_rcv) < uio->uio_resid) &&
1973 sbavail(&so->so_rcv) < so->so_rcv.sb_lowat &&
1974 m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) {
1975 KASSERT(m != NULL || !sbavail(&so->so_rcv),
1976 ("receive: m == %p sbavail == %u",
1977 m, sbavail(&so->so_rcv)));
1978 if (so->so_error || so->so_rerror) {
1982 error = so->so_error;
1984 error = so->so_rerror;
1985 if ((flags & MSG_PEEK) == 0) {
1991 SOCKBUF_UNLOCK(&so->so_rcv);
1994 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1995 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
1999 else if (so->so_rcv.sb_tlsdcc == 0 &&
2000 so->so_rcv.sb_tlscc == 0) {
2004 SOCKBUF_UNLOCK(&so->so_rcv);
2008 for (; m != NULL; m = m->m_next)
2009 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
2010 m = so->so_rcv.sb_mb;
2013 if ((so->so_state & (SS_ISCONNECTING | SS_ISCONNECTED |
2014 SS_ISDISCONNECTING | SS_ISDISCONNECTED)) == 0 &&
2015 (so->so_proto->pr_flags & PR_CONNREQUIRED) != 0) {
2016 SOCKBUF_UNLOCK(&so->so_rcv);
2020 if (uio->uio_resid == 0 && !report_real_len) {
2021 SOCKBUF_UNLOCK(&so->so_rcv);
2024 if ((so->so_state & SS_NBIO) ||
2025 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
2026 SOCKBUF_UNLOCK(&so->so_rcv);
2027 error = EWOULDBLOCK;
2030 SBLASTRECORDCHK(&so->so_rcv);
2031 SBLASTMBUFCHK(&so->so_rcv);
2032 error = sbwait(so, SO_RCV);
2033 SOCKBUF_UNLOCK(&so->so_rcv);
2040 * From this point onward, we maintain 'nextrecord' as a cache of the
2041 * pointer to the next record in the socket buffer. We must keep the
2042 * various socket buffer pointers and local stack versions of the
2043 * pointers in sync, pushing out modifications before dropping the
2044 * socket buffer mutex, and re-reading them when picking it up.
2046 * Otherwise, we will race with the network stack appending new data
2047 * or records onto the socket buffer by using inconsistent/stale
2048 * versions of the field, possibly resulting in socket buffer
2051 * By holding the high-level sblock(), we prevent simultaneous
2052 * readers from pulling off the front of the socket buffer.
2054 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2056 uio->uio_td->td_ru.ru_msgrcv++;
2057 KASSERT(m == so->so_rcv.sb_mb, ("soreceive: m != so->so_rcv.sb_mb"));
2058 SBLASTRECORDCHK(&so->so_rcv);
2059 SBLASTMBUFCHK(&so->so_rcv);
2060 nextrecord = m->m_nextpkt;
2061 if (pr->pr_flags & PR_ADDR) {
2062 KASSERT(m->m_type == MT_SONAME,
2063 ("m->m_type == %d", m->m_type));
2066 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
2068 if (flags & MSG_PEEK) {
2071 sbfree(&so->so_rcv, m);
2072 so->so_rcv.sb_mb = m_free(m);
2073 m = so->so_rcv.sb_mb;
2074 sockbuf_pushsync(&so->so_rcv, nextrecord);
2079 * Process one or more MT_CONTROL mbufs present before any data mbufs
2080 * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
2081 * just copy the data; if !MSG_PEEK, we call into the protocol to
2082 * perform externalization (or freeing if controlp == NULL).
2084 if (m != NULL && m->m_type == MT_CONTROL) {
2085 struct mbuf *cm = NULL, *cmn;
2086 struct mbuf **cme = &cm;
2088 struct cmsghdr *cmsg;
2089 struct tls_get_record tgr;
2092 * For MSG_TLSAPPDATA, check for an alert record.
2093 * If found, return ENXIO without removing
2094 * it from the receive queue. This allows a subsequent
2095 * call without MSG_TLSAPPDATA to receive it.
2096 * Note that, for TLS, there should only be a single
2097 * control mbuf with the TLS_GET_RECORD message in it.
2099 if (flags & MSG_TLSAPPDATA) {
2100 cmsg = mtod(m, struct cmsghdr *);
2101 if (cmsg->cmsg_type == TLS_GET_RECORD &&
2102 cmsg->cmsg_len == CMSG_LEN(sizeof(tgr))) {
2103 memcpy(&tgr, CMSG_DATA(cmsg), sizeof(tgr));
2104 if (__predict_false(tgr.tls_type ==
2105 TLS_RLTYPE_ALERT)) {
2106 SOCKBUF_UNLOCK(&so->so_rcv);
2115 if (flags & MSG_PEEK) {
2116 if (controlp != NULL) {
2117 *controlp = m_copym(m, 0, m->m_len,
2119 controlp = &(*controlp)->m_next;
2123 sbfree(&so->so_rcv, m);
2124 so->so_rcv.sb_mb = m->m_next;
2127 cme = &(*cme)->m_next;
2128 m = so->so_rcv.sb_mb;
2130 } while (m != NULL && m->m_type == MT_CONTROL);
2131 if ((flags & MSG_PEEK) == 0)
2132 sockbuf_pushsync(&so->so_rcv, nextrecord);
2133 while (cm != NULL) {
2136 if (pr->pr_domain->dom_externalize != NULL) {
2137 SOCKBUF_UNLOCK(&so->so_rcv);
2139 error = (*pr->pr_domain->dom_externalize)
2140 (cm, controlp, flags);
2141 SOCKBUF_LOCK(&so->so_rcv);
2142 } else if (controlp != NULL)
2146 if (controlp != NULL) {
2147 while (*controlp != NULL)
2148 controlp = &(*controlp)->m_next;
2153 nextrecord = so->so_rcv.sb_mb->m_nextpkt;
2155 nextrecord = so->so_rcv.sb_mb;
2159 if ((flags & MSG_PEEK) == 0) {
2160 KASSERT(m->m_nextpkt == nextrecord,
2161 ("soreceive: post-control, nextrecord !sync"));
2162 if (nextrecord == NULL) {
2163 KASSERT(so->so_rcv.sb_mb == m,
2164 ("soreceive: post-control, sb_mb!=m"));
2165 KASSERT(so->so_rcv.sb_lastrecord == m,
2166 ("soreceive: post-control, lastrecord!=m"));
2170 if (type == MT_OOBDATA)
2173 if ((flags & MSG_PEEK) == 0) {
2174 KASSERT(so->so_rcv.sb_mb == nextrecord,
2175 ("soreceive: sb_mb != nextrecord"));
2176 if (so->so_rcv.sb_mb == NULL) {
2177 KASSERT(so->so_rcv.sb_lastrecord == NULL,
2178 ("soreceive: sb_lastercord != NULL"));
2182 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2183 SBLASTRECORDCHK(&so->so_rcv);
2184 SBLASTMBUFCHK(&so->so_rcv);
2187 * Now continue to read any data mbufs off of the head of the socket
2188 * buffer until the read request is satisfied. Note that 'type' is
2189 * used to store the type of any mbuf reads that have happened so far
2190 * such that soreceive() can stop reading if the type changes, which
2191 * causes soreceive() to return only one of regular data and inline
2192 * out-of-band data in a single socket receive operation.
2196 while (m != NULL && !(m->m_flags & M_NOTAVAIL) && uio->uio_resid > 0
2199 * If the type of mbuf has changed since the last mbuf
2200 * examined ('type'), end the receive operation.
2202 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2203 if (m->m_type == MT_OOBDATA || m->m_type == MT_CONTROL) {
2204 if (type != m->m_type)
2206 } else if (type == MT_OOBDATA)
2209 KASSERT(m->m_type == MT_DATA,
2210 ("m->m_type == %d", m->m_type));
2211 so->so_rcv.sb_state &= ~SBS_RCVATMARK;
2212 len = uio->uio_resid;
2213 if (so->so_oobmark && len > so->so_oobmark - offset)
2214 len = so->so_oobmark - offset;
2215 if (len > m->m_len - moff)
2216 len = m->m_len - moff;
2218 * If mp is set, just pass back the mbufs. Otherwise copy
2219 * them out via the uio, then free. Sockbuf must be
2220 * consistent here (points to current mbuf, it points to next
2221 * record) when we drop priority; we must note any additions
2222 * to the sockbuf when we block interrupts again.
2225 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2226 SBLASTRECORDCHK(&so->so_rcv);
2227 SBLASTMBUFCHK(&so->so_rcv);
2228 SOCKBUF_UNLOCK(&so->so_rcv);
2229 if ((m->m_flags & M_EXTPG) != 0)
2230 error = m_unmapped_uiomove(m, moff, uio,
2233 error = uiomove(mtod(m, char *) + moff,
2235 SOCKBUF_LOCK(&so->so_rcv);
2238 * The MT_SONAME mbuf has already been removed
2239 * from the record, so it is necessary to
2240 * remove the data mbufs, if any, to preserve
2241 * the invariant in the case of PR_ADDR that
2242 * requires MT_SONAME mbufs at the head of
2245 if (pr->pr_flags & PR_ATOMIC &&
2246 ((flags & MSG_PEEK) == 0))
2247 (void)sbdroprecord_locked(&so->so_rcv);
2248 SOCKBUF_UNLOCK(&so->so_rcv);
2252 uio->uio_resid -= len;
2253 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2254 if (len == m->m_len - moff) {
2255 if (m->m_flags & M_EOR)
2257 if (flags & MSG_PEEK) {
2261 nextrecord = m->m_nextpkt;
2262 sbfree(&so->so_rcv, m);
2264 m->m_nextpkt = NULL;
2267 so->so_rcv.sb_mb = m = m->m_next;
2270 so->so_rcv.sb_mb = m_free(m);
2271 m = so->so_rcv.sb_mb;
2273 sockbuf_pushsync(&so->so_rcv, nextrecord);
2274 SBLASTRECORDCHK(&so->so_rcv);
2275 SBLASTMBUFCHK(&so->so_rcv);
2278 if (flags & MSG_PEEK)
2282 if (flags & MSG_DONTWAIT) {
2283 *mp = m_copym(m, 0, len,
2287 * m_copym() couldn't
2289 * Adjust uio_resid back
2291 * down by len bytes,
2292 * which we didn't end
2293 * up "copying" over).
2295 uio->uio_resid += len;
2299 SOCKBUF_UNLOCK(&so->so_rcv);
2300 *mp = m_copym(m, 0, len,
2302 SOCKBUF_LOCK(&so->so_rcv);
2305 sbcut_locked(&so->so_rcv, len);
2308 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2309 if (so->so_oobmark) {
2310 if ((flags & MSG_PEEK) == 0) {
2311 so->so_oobmark -= len;
2312 if (so->so_oobmark == 0) {
2313 so->so_rcv.sb_state |= SBS_RCVATMARK;
2318 if (offset == so->so_oobmark)
2322 if (flags & MSG_EOR)
2325 * If the MSG_WAITALL flag is set (for non-atomic socket), we
2326 * must not quit until "uio->uio_resid == 0" or an error
2327 * termination. If a signal/timeout occurs, return with a
2328 * short count but without error. Keep sockbuf locked
2329 * against other readers.
2331 while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
2332 !sosendallatonce(so) && nextrecord == NULL) {
2333 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2334 if (so->so_error || so->so_rerror ||
2335 so->so_rcv.sb_state & SBS_CANTRCVMORE)
2338 * Notify the protocol that some data has been
2339 * drained before blocking.
2341 if (pr->pr_flags & PR_WANTRCVD) {
2342 SOCKBUF_UNLOCK(&so->so_rcv);
2344 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
2345 SOCKBUF_LOCK(&so->so_rcv);
2347 SBLASTRECORDCHK(&so->so_rcv);
2348 SBLASTMBUFCHK(&so->so_rcv);
2350 * We could receive some data while was notifying
2351 * the protocol. Skip blocking in this case.
2353 if (so->so_rcv.sb_mb == NULL) {
2354 error = sbwait(so, SO_RCV);
2356 SOCKBUF_UNLOCK(&so->so_rcv);
2360 m = so->so_rcv.sb_mb;
2362 nextrecord = m->m_nextpkt;
2366 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2367 if (m != NULL && pr->pr_flags & PR_ATOMIC) {
2368 if (report_real_len)
2369 uio->uio_resid -= m_length(m, NULL) - moff;
2371 if ((flags & MSG_PEEK) == 0)
2372 (void) sbdroprecord_locked(&so->so_rcv);
2374 if ((flags & MSG_PEEK) == 0) {
2377 * First part is an inline SB_EMPTY_FIXUP(). Second
2378 * part makes sure sb_lastrecord is up-to-date if
2379 * there is still data in the socket buffer.
2381 so->so_rcv.sb_mb = nextrecord;
2382 if (so->so_rcv.sb_mb == NULL) {
2383 so->so_rcv.sb_mbtail = NULL;
2384 so->so_rcv.sb_lastrecord = NULL;
2385 } else if (nextrecord->m_nextpkt == NULL)
2386 so->so_rcv.sb_lastrecord = nextrecord;
2388 SBLASTRECORDCHK(&so->so_rcv);
2389 SBLASTMBUFCHK(&so->so_rcv);
2391 * If soreceive() is being done from the socket callback,
2392 * then don't need to generate ACK to peer to update window,
2393 * since ACK will be generated on return to TCP.
2395 if (!(flags & MSG_SOCALLBCK) &&
2396 (pr->pr_flags & PR_WANTRCVD)) {
2397 SOCKBUF_UNLOCK(&so->so_rcv);
2399 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
2400 SOCKBUF_LOCK(&so->so_rcv);
2403 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2404 if (orig_resid == uio->uio_resid && orig_resid &&
2405 (flags & MSG_EOR) == 0 && (so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0) {
2406 SOCKBUF_UNLOCK(&so->so_rcv);
2409 SOCKBUF_UNLOCK(&so->so_rcv);
2414 SOCK_IO_RECV_UNLOCK(so);
2419 * Optimized version of soreceive() for stream (TCP) sockets.
2422 soreceive_stream(struct socket *so, struct sockaddr **psa, struct uio *uio,
2423 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2425 int len = 0, error = 0, flags, oresid;
2427 struct mbuf *m, *n = NULL;
2429 /* We only do stream sockets. */
2430 if (so->so_type != SOCK_STREAM)
2435 flags = *flagsp &~ MSG_EOR;
2438 if (controlp != NULL)
2440 if (flags & MSG_OOB)
2441 return (soreceive_rcvoob(so, uio, flags));
2449 * KTLS store TLS records as records with a control message to
2450 * describe the framing.
2452 * We check once here before acquiring locks to optimize the
2455 if (sb->sb_tls_info != NULL)
2456 return (soreceive_generic(so, psa, uio, mp0, controlp,
2460 /* Prevent other readers from entering the socket. */
2461 error = SOCK_IO_RECV_LOCK(so, SBLOCKWAIT(flags));
2467 if (sb->sb_tls_info != NULL) {
2469 SOCK_IO_RECV_UNLOCK(so);
2470 return (soreceive_generic(so, psa, uio, mp0, controlp,
2475 /* Easy one, no space to copyout anything. */
2476 if (uio->uio_resid == 0) {
2480 oresid = uio->uio_resid;
2482 /* We will never ever get anything unless we are or were connected. */
2483 if (!(so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED))) {
2489 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2491 /* Abort if socket has reported problems. */
2493 if (sbavail(sb) > 0)
2495 if (oresid > uio->uio_resid)
2497 error = so->so_error;
2498 if (!(flags & MSG_PEEK))
2503 /* Door is closed. Deliver what is left, if any. */
2504 if (sb->sb_state & SBS_CANTRCVMORE) {
2505 if (sbavail(sb) > 0)
2511 /* Socket buffer is empty and we shall not block. */
2512 if (sbavail(sb) == 0 &&
2513 ((so->so_state & SS_NBIO) || (flags & (MSG_DONTWAIT|MSG_NBIO)))) {
2518 /* Socket buffer got some data that we shall deliver now. */
2519 if (sbavail(sb) > 0 && !(flags & MSG_WAITALL) &&
2520 ((so->so_state & SS_NBIO) ||
2521 (flags & (MSG_DONTWAIT|MSG_NBIO)) ||
2522 sbavail(sb) >= sb->sb_lowat ||
2523 sbavail(sb) >= uio->uio_resid ||
2524 sbavail(sb) >= sb->sb_hiwat) ) {
2528 /* On MSG_WAITALL we must wait until all data or error arrives. */
2529 if ((flags & MSG_WAITALL) &&
2530 (sbavail(sb) >= uio->uio_resid || sbavail(sb) >= sb->sb_hiwat))
2534 * Wait and block until (more) data comes in.
2535 * NB: Drops the sockbuf lock during wait.
2537 error = sbwait(so, SO_RCV);
2543 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2544 KASSERT(sbavail(sb) > 0, ("%s: sockbuf empty", __func__));
2545 KASSERT(sb->sb_mb != NULL, ("%s: sb_mb == NULL", __func__));
2549 uio->uio_td->td_ru.ru_msgrcv++;
2551 /* Fill uio until full or current end of socket buffer is reached. */
2552 len = min(uio->uio_resid, sbavail(sb));
2554 /* Dequeue as many mbufs as possible. */
2555 if (!(flags & MSG_PEEK) && len >= sb->sb_mb->m_len) {
2559 m_cat(*mp0, sb->sb_mb);
2561 m != NULL && m->m_len <= len;
2563 KASSERT(!(m->m_flags & M_NOTAVAIL),
2564 ("%s: m %p not available", __func__, m));
2566 uio->uio_resid -= m->m_len;
2572 sb->sb_lastrecord = sb->sb_mb;
2573 if (sb->sb_mb == NULL)
2576 /* Copy the remainder. */
2578 KASSERT(sb->sb_mb != NULL,
2579 ("%s: len > 0 && sb->sb_mb empty", __func__));
2581 m = m_copym(sb->sb_mb, 0, len, M_NOWAIT);
2583 len = 0; /* Don't flush data from sockbuf. */
2585 uio->uio_resid -= len;
2596 /* NB: Must unlock socket buffer as uiomove may sleep. */
2598 error = m_mbuftouio(uio, sb->sb_mb, len);
2603 SBLASTRECORDCHK(sb);
2607 * Remove the delivered data from the socket buffer unless we
2608 * were only peeking.
2610 if (!(flags & MSG_PEEK)) {
2612 sbdrop_locked(sb, len);
2614 /* Notify protocol that we drained some data. */
2615 if ((so->so_proto->pr_flags & PR_WANTRCVD) &&
2616 (((flags & MSG_WAITALL) && uio->uio_resid > 0) ||
2617 !(flags & MSG_SOCALLBCK))) {
2620 (*so->so_proto->pr_usrreqs->pru_rcvd)(so, flags);
2626 * For MSG_WAITALL we may have to loop again and wait for
2627 * more data to come in.
2629 if ((flags & MSG_WAITALL) && uio->uio_resid > 0)
2632 SBLASTRECORDCHK(sb);
2635 SOCK_IO_RECV_UNLOCK(so);
2640 * Optimized version of soreceive() for simple datagram cases from userspace.
2641 * Unlike in the stream case, we're able to drop a datagram if copyout()
2642 * fails, and because we handle datagrams atomically, we don't need to use a
2643 * sleep lock to prevent I/O interlacing.
2646 soreceive_dgram(struct socket *so, struct sockaddr **psa, struct uio *uio,
2647 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2649 struct mbuf *m, *m2;
2652 struct protosw *pr = so->so_proto;
2653 struct mbuf *nextrecord;
2657 if (controlp != NULL)
2660 flags = *flagsp &~ MSG_EOR;
2665 * For any complicated cases, fall back to the full
2666 * soreceive_generic().
2668 if (mp0 != NULL || (flags & (MSG_PEEK | MSG_OOB | MSG_TRUNC)))
2669 return (soreceive_generic(so, psa, uio, mp0, controlp,
2673 * Enforce restrictions on use.
2675 KASSERT((pr->pr_flags & PR_WANTRCVD) == 0,
2676 ("soreceive_dgram: wantrcvd"));
2677 KASSERT(pr->pr_flags & PR_ATOMIC, ("soreceive_dgram: !atomic"));
2678 KASSERT((so->so_rcv.sb_state & SBS_RCVATMARK) == 0,
2679 ("soreceive_dgram: SBS_RCVATMARK"));
2680 KASSERT((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0,
2681 ("soreceive_dgram: P_CONNREQUIRED"));
2684 * Loop blocking while waiting for a datagram.
2686 SOCKBUF_LOCK(&so->so_rcv);
2687 while ((m = so->so_rcv.sb_mb) == NULL) {
2688 KASSERT(sbavail(&so->so_rcv) == 0,
2689 ("soreceive_dgram: sb_mb NULL but sbavail %u",
2690 sbavail(&so->so_rcv)));
2692 error = so->so_error;
2694 SOCKBUF_UNLOCK(&so->so_rcv);
2697 if (so->so_rcv.sb_state & SBS_CANTRCVMORE ||
2698 uio->uio_resid == 0) {
2699 SOCKBUF_UNLOCK(&so->so_rcv);
2702 if ((so->so_state & SS_NBIO) ||
2703 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
2704 SOCKBUF_UNLOCK(&so->so_rcv);
2705 return (EWOULDBLOCK);
2707 SBLASTRECORDCHK(&so->so_rcv);
2708 SBLASTMBUFCHK(&so->so_rcv);
2709 error = sbwait(so, SO_RCV);
2711 SOCKBUF_UNLOCK(&so->so_rcv);
2715 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2718 uio->uio_td->td_ru.ru_msgrcv++;
2719 SBLASTRECORDCHK(&so->so_rcv);
2720 SBLASTMBUFCHK(&so->so_rcv);
2721 nextrecord = m->m_nextpkt;
2722 if (nextrecord == NULL) {
2723 KASSERT(so->so_rcv.sb_lastrecord == m,
2724 ("soreceive_dgram: lastrecord != m"));
2727 KASSERT(so->so_rcv.sb_mb->m_nextpkt == nextrecord,
2728 ("soreceive_dgram: m_nextpkt != nextrecord"));
2731 * Pull 'm' and its chain off the front of the packet queue.
2733 so->so_rcv.sb_mb = NULL;
2734 sockbuf_pushsync(&so->so_rcv, nextrecord);
2737 * Walk 'm's chain and free that many bytes from the socket buffer.
2739 for (m2 = m; m2 != NULL; m2 = m2->m_next)
2740 sbfree(&so->so_rcv, m2);
2743 * Do a few last checks before we let go of the lock.
2745 SBLASTRECORDCHK(&so->so_rcv);
2746 SBLASTMBUFCHK(&so->so_rcv);
2747 SOCKBUF_UNLOCK(&so->so_rcv);
2749 if (pr->pr_flags & PR_ADDR) {
2750 KASSERT(m->m_type == MT_SONAME,
2751 ("m->m_type == %d", m->m_type));
2753 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
2758 /* XXXRW: Can this happen? */
2763 * Packet to copyout() is now in 'm' and it is disconnected from the
2766 * Process one or more MT_CONTROL mbufs present before any data mbufs
2767 * in the first mbuf chain on the socket buffer. We call into the
2768 * protocol to perform externalization (or freeing if controlp ==
2769 * NULL). In some cases there can be only MT_CONTROL mbufs without
2772 if (m->m_type == MT_CONTROL) {
2773 struct mbuf *cm = NULL, *cmn;
2774 struct mbuf **cme = &cm;
2780 cme = &(*cme)->m_next;
2782 } while (m != NULL && m->m_type == MT_CONTROL);
2783 while (cm != NULL) {
2786 if (pr->pr_domain->dom_externalize != NULL) {
2787 error = (*pr->pr_domain->dom_externalize)
2788 (cm, controlp, flags);
2789 } else if (controlp != NULL)
2793 if (controlp != NULL) {
2794 while (*controlp != NULL)
2795 controlp = &(*controlp)->m_next;
2800 KASSERT(m == NULL || m->m_type == MT_DATA,
2801 ("soreceive_dgram: !data"));
2802 while (m != NULL && uio->uio_resid > 0) {
2803 len = uio->uio_resid;
2806 error = uiomove(mtod(m, char *), (int)len, uio);
2811 if (len == m->m_len)
2828 soreceive(struct socket *so, struct sockaddr **psa, struct uio *uio,
2829 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2833 CURVNET_SET(so->so_vnet);
2834 error = (so->so_proto->pr_usrreqs->pru_soreceive(so, psa, uio,
2835 mp0, controlp, flagsp));
2841 soshutdown(struct socket *so, int how)
2844 int error, soerror_enotconn;
2846 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
2849 soerror_enotconn = 0;
2852 (SS_ISCONNECTED | SS_ISCONNECTING | SS_ISDISCONNECTING)) == 0) {
2854 * POSIX mandates us to return ENOTCONN when shutdown(2) is
2855 * invoked on a datagram sockets, however historically we would
2856 * actually tear socket down. This is known to be leveraged by
2857 * some applications to unblock process waiting in recvXXX(2)
2858 * by other process that it shares that socket with. Try to meet
2859 * both backward-compatibility and POSIX requirements by forcing
2860 * ENOTCONN but still asking protocol to perform pru_shutdown().
2862 if (so->so_type != SOCK_DGRAM && !SOLISTENING(so)) {
2866 soerror_enotconn = 1;
2869 if (SOLISTENING(so)) {
2870 if (how != SHUT_WR) {
2871 so->so_error = ECONNABORTED;
2872 solisten_wakeup(so); /* unlocks so */
2880 CURVNET_SET(so->so_vnet);
2882 if (pr->pr_usrreqs->pru_flush != NULL)
2883 (*pr->pr_usrreqs->pru_flush)(so, how);
2886 if (how != SHUT_RD) {
2887 error = (*pr->pr_usrreqs->pru_shutdown)(so);
2888 wakeup(&so->so_timeo);
2890 return ((error == 0 && soerror_enotconn) ? ENOTCONN : error);
2892 wakeup(&so->so_timeo);
2896 return (soerror_enotconn ? ENOTCONN : 0);
2900 sorflush(struct socket *so)
2908 * Dislodge threads currently blocked in receive and wait to acquire
2909 * a lock against other simultaneous readers before clearing the
2910 * socket buffer. Don't let our acquire be interrupted by a signal
2911 * despite any existing socket disposition on interruptable waiting.
2915 error = SOCK_IO_RECV_LOCK(so, SBL_WAIT | SBL_NOINTR);
2917 KASSERT(SOLISTENING(so),
2918 ("%s: soiolock(%p) failed", __func__, so));
2923 if (pr->pr_flags & PR_RIGHTS) {
2924 MPASS(pr->pr_domain->dom_dispose != NULL);
2925 (*pr->pr_domain->dom_dispose)(so);
2927 sbrelease(so, SO_RCV);
2928 SOCK_IO_RECV_UNLOCK(so);
2934 * Wrapper for Socket established helper hook.
2935 * Parameters: socket, context of the hook point, hook id.
2938 hhook_run_socket(struct socket *so, void *hctx, int32_t h_id)
2940 struct socket_hhook_data hhook_data = {
2947 CURVNET_SET(so->so_vnet);
2948 HHOOKS_RUN_IF(V_socket_hhh[h_id], &hhook_data, &so->osd);
2951 /* Ugly but needed, since hhooks return void for now */
2952 return (hhook_data.status);
2956 * Perhaps this routine, and sooptcopyout(), below, ought to come in an
2957 * additional variant to handle the case where the option value needs to be
2958 * some kind of integer, but not a specific size. In addition to their use
2959 * here, these functions are also called by the protocol-level pr_ctloutput()
2963 sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
2968 * If the user gives us more than we wanted, we ignore it, but if we
2969 * don't get the minimum length the caller wants, we return EINVAL.
2970 * On success, sopt->sopt_valsize is set to however much we actually
2973 if ((valsize = sopt->sopt_valsize) < minlen)
2976 sopt->sopt_valsize = valsize = len;
2978 if (sopt->sopt_td != NULL)
2979 return (copyin(sopt->sopt_val, buf, valsize));
2981 bcopy(sopt->sopt_val, buf, valsize);
2986 * Kernel version of setsockopt(2).
2988 * XXX: optlen is size_t, not socklen_t
2991 so_setsockopt(struct socket *so, int level, int optname, void *optval,
2994 struct sockopt sopt;
2996 sopt.sopt_level = level;
2997 sopt.sopt_name = optname;
2998 sopt.sopt_dir = SOPT_SET;
2999 sopt.sopt_val = optval;
3000 sopt.sopt_valsize = optlen;
3001 sopt.sopt_td = NULL;
3002 return (sosetopt(so, &sopt));
3006 sosetopt(struct socket *so, struct sockopt *sopt)
3011 sbintime_t val, *valp;
3017 CURVNET_SET(so->so_vnet);
3019 if (sopt->sopt_level != SOL_SOCKET) {
3020 if (so->so_proto->pr_ctloutput != NULL)
3021 error = (*so->so_proto->pr_ctloutput)(so, sopt);
3023 error = ENOPROTOOPT;
3025 switch (sopt->sopt_name) {
3026 case SO_ACCEPTFILTER:
3027 error = accept_filt_setopt(so, sopt);
3033 error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
3036 if (l.l_linger < 0 ||
3037 l.l_linger > USHRT_MAX ||
3038 l.l_linger > (INT_MAX / hz)) {
3043 so->so_linger = l.l_linger;
3045 so->so_options |= SO_LINGER;
3047 so->so_options &= ~SO_LINGER;
3054 case SO_USELOOPBACK:
3058 case SO_REUSEPORT_LB:
3066 error = sooptcopyin(sopt, &optval, sizeof optval,
3072 so->so_options |= sopt->sopt_name;
3074 so->so_options &= ~sopt->sopt_name;
3079 error = sooptcopyin(sopt, &optval, sizeof optval,
3084 if (optval < 0 || optval >= rt_numfibs) {
3088 if (((so->so_proto->pr_domain->dom_family == PF_INET) ||
3089 (so->so_proto->pr_domain->dom_family == PF_INET6) ||
3090 (so->so_proto->pr_domain->dom_family == PF_ROUTE)))
3091 so->so_fibnum = optval;
3096 case SO_USER_COOKIE:
3097 error = sooptcopyin(sopt, &val32, sizeof val32,
3101 so->so_user_cookie = val32;
3108 error = sooptcopyin(sopt, &optval, sizeof optval,
3114 * Values < 1 make no sense for any of these options,
3122 error = sbsetopt(so, sopt->sopt_name, optval);
3127 #ifdef COMPAT_FREEBSD32
3128 if (SV_CURPROC_FLAG(SV_ILP32)) {
3129 struct timeval32 tv32;
3131 error = sooptcopyin(sopt, &tv32, sizeof tv32,
3133 CP(tv32, tv, tv_sec);
3134 CP(tv32, tv, tv_usec);
3137 error = sooptcopyin(sopt, &tv, sizeof tv,
3141 if (tv.tv_sec < 0 || tv.tv_usec < 0 ||
3142 tv.tv_usec >= 1000000) {
3146 if (tv.tv_sec > INT32_MAX)
3151 valp = sopt->sopt_name == SO_SNDTIMEO ?
3152 (SOLISTENING(so) ? &so->sol_sbsnd_timeo :
3153 &so->so_snd.sb_timeo) :
3154 (SOLISTENING(so) ? &so->sol_sbrcv_timeo :
3155 &so->so_rcv.sb_timeo);
3162 error = sooptcopyin(sopt, &extmac, sizeof extmac,
3166 error = mac_setsockopt_label(sopt->sopt_td->td_ucred,
3174 error = sooptcopyin(sopt, &optval, sizeof optval,
3178 if (optval < 0 || optval > SO_TS_CLOCK_MAX) {
3182 so->so_ts_clock = optval;
3185 case SO_MAX_PACING_RATE:
3186 error = sooptcopyin(sopt, &val32, sizeof(val32),
3190 so->so_max_pacing_rate = val32;
3194 if (V_socket_hhh[HHOOK_SOCKET_OPT]->hhh_nhooks > 0)
3195 error = hhook_run_socket(so, sopt,
3198 error = ENOPROTOOPT;
3201 if (error == 0 && so->so_proto->pr_ctloutput != NULL)
3202 (void)(*so->so_proto->pr_ctloutput)(so, sopt);
3210 * Helper routine for getsockopt.
3213 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
3221 * Documented get behavior is that we always return a value, possibly
3222 * truncated to fit in the user's buffer. Traditional behavior is
3223 * that we always tell the user precisely how much we copied, rather
3224 * than something useful like the total amount we had available for
3225 * her. Note that this interface is not idempotent; the entire
3226 * answer must be generated ahead of time.
3228 valsize = min(len, sopt->sopt_valsize);
3229 sopt->sopt_valsize = valsize;
3230 if (sopt->sopt_val != NULL) {
3231 if (sopt->sopt_td != NULL)
3232 error = copyout(buf, sopt->sopt_val, valsize);
3234 bcopy(buf, sopt->sopt_val, valsize);
3240 sogetopt(struct socket *so, struct sockopt *sopt)
3249 CURVNET_SET(so->so_vnet);
3251 if (sopt->sopt_level != SOL_SOCKET) {
3252 if (so->so_proto->pr_ctloutput != NULL)
3253 error = (*so->so_proto->pr_ctloutput)(so, sopt);
3255 error = ENOPROTOOPT;
3259 switch (sopt->sopt_name) {
3260 case SO_ACCEPTFILTER:
3261 error = accept_filt_getopt(so, sopt);
3266 l.l_onoff = so->so_options & SO_LINGER;
3267 l.l_linger = so->so_linger;
3269 error = sooptcopyout(sopt, &l, sizeof l);
3272 case SO_USELOOPBACK:
3278 case SO_REUSEPORT_LB:
3288 optval = so->so_options & sopt->sopt_name;
3290 error = sooptcopyout(sopt, &optval, sizeof optval);
3294 optval = so->so_proto->pr_domain->dom_family;
3298 optval = so->so_type;
3302 optval = so->so_proto->pr_protocol;
3308 optval = so->so_error;
3311 optval = so->so_rerror;
3318 optval = SOLISTENING(so) ? so->sol_sbsnd_hiwat :
3319 so->so_snd.sb_hiwat;
3323 optval = SOLISTENING(so) ? so->sol_sbrcv_hiwat :
3324 so->so_rcv.sb_hiwat;
3328 optval = SOLISTENING(so) ? so->sol_sbsnd_lowat :
3329 so->so_snd.sb_lowat;
3333 optval = SOLISTENING(so) ? so->sol_sbrcv_lowat :
3334 so->so_rcv.sb_lowat;
3340 tv = sbttotv(sopt->sopt_name == SO_SNDTIMEO ?
3341 (SOLISTENING(so) ? so->sol_sbsnd_timeo :
3342 so->so_snd.sb_timeo) :
3343 (SOLISTENING(so) ? so->sol_sbrcv_timeo :
3344 so->so_rcv.sb_timeo));
3346 #ifdef COMPAT_FREEBSD32
3347 if (SV_CURPROC_FLAG(SV_ILP32)) {
3348 struct timeval32 tv32;
3350 CP(tv, tv32, tv_sec);
3351 CP(tv, tv32, tv_usec);
3352 error = sooptcopyout(sopt, &tv32, sizeof tv32);
3355 error = sooptcopyout(sopt, &tv, sizeof tv);
3360 error = sooptcopyin(sopt, &extmac, sizeof(extmac),
3364 error = mac_getsockopt_label(sopt->sopt_td->td_ucred,
3368 error = sooptcopyout(sopt, &extmac, sizeof extmac);
3376 error = sooptcopyin(sopt, &extmac, sizeof(extmac),
3380 error = mac_getsockopt_peerlabel(
3381 sopt->sopt_td->td_ucred, so, &extmac);
3384 error = sooptcopyout(sopt, &extmac, sizeof extmac);
3390 case SO_LISTENQLIMIT:
3391 optval = SOLISTENING(so) ? so->sol_qlimit : 0;
3395 optval = SOLISTENING(so) ? so->sol_qlen : 0;
3398 case SO_LISTENINCQLEN:
3399 optval = SOLISTENING(so) ? so->sol_incqlen : 0;
3403 optval = so->so_ts_clock;
3406 case SO_MAX_PACING_RATE:
3407 optval = so->so_max_pacing_rate;
3411 if (V_socket_hhh[HHOOK_SOCKET_OPT]->hhh_nhooks > 0)
3412 error = hhook_run_socket(so, sopt,
3415 error = ENOPROTOOPT;
3427 soopt_getm(struct sockopt *sopt, struct mbuf **mp)
3429 struct mbuf *m, *m_prev;
3430 int sopt_size = sopt->sopt_valsize;
3432 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
3435 if (sopt_size > MLEN) {
3436 MCLGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT);
3437 if ((m->m_flags & M_EXT) == 0) {
3441 m->m_len = min(MCLBYTES, sopt_size);
3443 m->m_len = min(MLEN, sopt_size);
3445 sopt_size -= m->m_len;
3450 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
3455 if (sopt_size > MLEN) {
3456 MCLGET(m, sopt->sopt_td != NULL ? M_WAITOK :
3458 if ((m->m_flags & M_EXT) == 0) {
3463 m->m_len = min(MCLBYTES, sopt_size);
3465 m->m_len = min(MLEN, sopt_size);
3467 sopt_size -= m->m_len;
3475 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
3477 struct mbuf *m0 = m;
3479 if (sopt->sopt_val == NULL)
3481 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
3482 if (sopt->sopt_td != NULL) {
3485 error = copyin(sopt->sopt_val, mtod(m, char *),
3492 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len);
3493 sopt->sopt_valsize -= m->m_len;
3494 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
3497 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
3498 panic("ip6_sooptmcopyin");
3503 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
3505 struct mbuf *m0 = m;
3508 if (sopt->sopt_val == NULL)
3510 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
3511 if (sopt->sopt_td != NULL) {
3514 error = copyout(mtod(m, char *), sopt->sopt_val,
3521 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len);
3522 sopt->sopt_valsize -= m->m_len;
3523 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
3524 valsize += m->m_len;
3528 /* enough soopt buffer should be given from user-land */
3532 sopt->sopt_valsize = valsize;
3537 * sohasoutofband(): protocol notifies socket layer of the arrival of new
3538 * out-of-band data, which will then notify socket consumers.
3541 sohasoutofband(struct socket *so)
3544 if (so->so_sigio != NULL)
3545 pgsigio(&so->so_sigio, SIGURG, 0);
3546 selwakeuppri(&so->so_rdsel, PSOCK);
3550 sopoll(struct socket *so, int events, struct ucred *active_cred,
3555 * We do not need to set or assert curvnet as long as everyone uses
3558 return (so->so_proto->pr_usrreqs->pru_sopoll(so, events, active_cred,
3563 sopoll_generic(struct socket *so, int events, struct ucred *active_cred,
3569 if (SOLISTENING(so)) {
3570 if (!(events & (POLLIN | POLLRDNORM)))
3572 else if (!TAILQ_EMPTY(&so->sol_comp))
3573 revents = events & (POLLIN | POLLRDNORM);
3574 else if ((events & POLLINIGNEOF) == 0 && so->so_error)
3575 revents = (events & (POLLIN | POLLRDNORM)) | POLLHUP;
3577 selrecord(td, &so->so_rdsel);
3582 SOCK_SENDBUF_LOCK(so);
3583 SOCK_RECVBUF_LOCK(so);
3584 if (events & (POLLIN | POLLRDNORM))
3585 if (soreadabledata(so))
3586 revents |= events & (POLLIN | POLLRDNORM);
3587 if (events & (POLLOUT | POLLWRNORM))
3588 if (sowriteable(so))
3589 revents |= events & (POLLOUT | POLLWRNORM);
3590 if (events & (POLLPRI | POLLRDBAND))
3591 if (so->so_oobmark ||
3592 (so->so_rcv.sb_state & SBS_RCVATMARK))
3593 revents |= events & (POLLPRI | POLLRDBAND);
3594 if ((events & POLLINIGNEOF) == 0) {
3595 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
3596 revents |= events & (POLLIN | POLLRDNORM);
3597 if (so->so_snd.sb_state & SBS_CANTSENDMORE)
3601 if (so->so_rcv.sb_state & SBS_CANTRCVMORE)
3602 revents |= events & POLLRDHUP;
3605 (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND | POLLRDHUP)) {
3606 selrecord(td, &so->so_rdsel);
3607 so->so_rcv.sb_flags |= SB_SEL;
3609 if (events & (POLLOUT | POLLWRNORM)) {
3610 selrecord(td, &so->so_wrsel);
3611 so->so_snd.sb_flags |= SB_SEL;
3614 SOCK_RECVBUF_UNLOCK(so);
3615 SOCK_SENDBUF_UNLOCK(so);
3622 soo_kqfilter(struct file *fp, struct knote *kn)
3624 struct socket *so = kn->kn_fp->f_data;
3629 switch (kn->kn_filter) {
3631 kn->kn_fop = &soread_filtops;
3632 knl = &so->so_rdsel.si_note;
3637 kn->kn_fop = &sowrite_filtops;
3638 knl = &so->so_wrsel.si_note;
3643 kn->kn_fop = &soempty_filtops;
3644 knl = &so->so_wrsel.si_note;
3653 if (SOLISTENING(so)) {
3654 knlist_add(knl, kn, 1);
3656 SOCK_BUF_LOCK(so, which);
3657 knlist_add(knl, kn, 1);
3658 sb->sb_flags |= SB_KNOTE;
3659 SOCK_BUF_UNLOCK(so, which);
3666 * Some routines that return EOPNOTSUPP for entry points that are not
3667 * supported by a protocol. Fill in as needed.
3670 pru_accept_notsupp(struct socket *so, struct sockaddr **nam)
3677 pru_aio_queue_notsupp(struct socket *so, struct kaiocb *job)
3684 pru_attach_notsupp(struct socket *so, int proto, struct thread *td)
3691 pru_bind_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
3698 pru_bindat_notsupp(int fd, struct socket *so, struct sockaddr *nam,
3706 pru_connect_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
3713 pru_connectat_notsupp(int fd, struct socket *so, struct sockaddr *nam,
3721 pru_connect2_notsupp(struct socket *so1, struct socket *so2)
3728 pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
3729 struct ifnet *ifp, struct thread *td)
3736 pru_disconnect_notsupp(struct socket *so)
3743 pru_listen_notsupp(struct socket *so, int backlog, struct thread *td)
3750 pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam)
3757 pru_rcvd_notsupp(struct socket *so, int flags)
3764 pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags)
3771 pru_send_notsupp(struct socket *so, int flags, struct mbuf *m,
3772 struct sockaddr *addr, struct mbuf *control, struct thread *td)
3775 if (control != NULL)
3777 if ((flags & PRUS_NOTREADY) == 0)
3779 return (EOPNOTSUPP);
3783 pru_ready_notsupp(struct socket *so, struct mbuf *m, int count)
3786 return (EOPNOTSUPP);
3790 * This isn't really a ``null'' operation, but it's the default one and
3791 * doesn't do anything destructive.
3794 pru_sense_null(struct socket *so, struct stat *sb)
3797 sb->st_blksize = so->so_snd.sb_hiwat;
3802 pru_shutdown_notsupp(struct socket *so)
3809 pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam)
3816 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
3817 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
3824 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
3825 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
3832 pru_sopoll_notsupp(struct socket *so, int events, struct ucred *cred,
3840 filt_sordetach(struct knote *kn)
3842 struct socket *so = kn->kn_fp->f_data;
3845 knlist_remove(&so->so_rdsel.si_note, kn, 1);
3846 if (!SOLISTENING(so) && knlist_empty(&so->so_rdsel.si_note))
3847 so->so_rcv.sb_flags &= ~SB_KNOTE;
3848 so_rdknl_unlock(so);
3853 filt_soread(struct knote *kn, long hint)
3857 so = kn->kn_fp->f_data;
3859 if (SOLISTENING(so)) {
3860 SOCK_LOCK_ASSERT(so);
3861 kn->kn_data = so->sol_qlen;
3863 kn->kn_flags |= EV_EOF;
3864 kn->kn_fflags = so->so_error;
3867 return (!TAILQ_EMPTY(&so->sol_comp));
3870 SOCK_RECVBUF_LOCK_ASSERT(so);
3872 kn->kn_data = sbavail(&so->so_rcv) - so->so_rcv.sb_ctl;
3873 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
3874 kn->kn_flags |= EV_EOF;
3875 kn->kn_fflags = so->so_error;
3877 } else if (so->so_error || so->so_rerror)
3880 if (kn->kn_sfflags & NOTE_LOWAT) {
3881 if (kn->kn_data >= kn->kn_sdata)
3883 } else if (sbavail(&so->so_rcv) >= so->so_rcv.sb_lowat)
3886 /* This hook returning non-zero indicates an event, not error */
3887 return (hhook_run_socket(so, NULL, HHOOK_FILT_SOREAD));
3891 filt_sowdetach(struct knote *kn)
3893 struct socket *so = kn->kn_fp->f_data;
3896 knlist_remove(&so->so_wrsel.si_note, kn, 1);
3897 if (!SOLISTENING(so) && knlist_empty(&so->so_wrsel.si_note))
3898 so->so_snd.sb_flags &= ~SB_KNOTE;
3899 so_wrknl_unlock(so);
3904 filt_sowrite(struct knote *kn, long hint)
3908 so = kn->kn_fp->f_data;
3910 if (SOLISTENING(so))
3913 SOCK_SENDBUF_LOCK_ASSERT(so);
3914 kn->kn_data = sbspace(&so->so_snd);
3916 hhook_run_socket(so, kn, HHOOK_FILT_SOWRITE);
3918 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
3919 kn->kn_flags |= EV_EOF;
3920 kn->kn_fflags = so->so_error;
3922 } else if (so->so_error) /* temporary udp error */
3924 else if (((so->so_state & SS_ISCONNECTED) == 0) &&
3925 (so->so_proto->pr_flags & PR_CONNREQUIRED))
3927 else if (kn->kn_sfflags & NOTE_LOWAT)
3928 return (kn->kn_data >= kn->kn_sdata);
3930 return (kn->kn_data >= so->so_snd.sb_lowat);
3934 filt_soempty(struct knote *kn, long hint)
3938 so = kn->kn_fp->f_data;
3940 if (SOLISTENING(so))
3943 SOCK_SENDBUF_LOCK_ASSERT(so);
3944 kn->kn_data = sbused(&so->so_snd);
3946 if (kn->kn_data == 0)
3953 socheckuid(struct socket *so, uid_t uid)
3958 if (so->so_cred->cr_uid != uid)
3964 * These functions are used by protocols to notify the socket layer (and its
3965 * consumers) of state changes in the sockets driven by protocol-side events.
3969 * Procedures to manipulate state flags of socket and do appropriate wakeups.
3971 * Normal sequence from the active (originating) side is that
3972 * soisconnecting() is called during processing of connect() call, resulting
3973 * in an eventual call to soisconnected() if/when the connection is
3974 * established. When the connection is torn down soisdisconnecting() is
3975 * called during processing of disconnect() call, and soisdisconnected() is
3976 * called when the connection to the peer is totally severed. The semantics
3977 * of these routines are such that connectionless protocols can call
3978 * soisconnected() and soisdisconnected() only, bypassing the in-progress
3979 * calls when setting up a ``connection'' takes no time.
3981 * From the passive side, a socket is created with two queues of sockets:
3982 * so_incomp for connections in progress and so_comp for connections already
3983 * made and awaiting user acceptance. As a protocol is preparing incoming
3984 * connections, it creates a socket structure queued on so_incomp by calling
3985 * sonewconn(). When the connection is established, soisconnected() is
3986 * called, and transfers the socket structure to so_comp, making it available
3989 * If a socket is closed with sockets on either so_incomp or so_comp, these
3990 * sockets are dropped.
3992 * If higher-level protocols are implemented in the kernel, the wakeups done
3993 * here will sometimes cause software-interrupt process scheduling.
3996 soisconnecting(struct socket *so)
4000 so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
4001 so->so_state |= SS_ISCONNECTING;
4006 soisconnected(struct socket *so)
4008 bool last __diagused;
4011 so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
4012 so->so_state |= SS_ISCONNECTED;
4014 if (so->so_qstate == SQ_INCOMP) {
4015 struct socket *head = so->so_listen;
4018 KASSERT(head, ("%s: so %p on incomp of NULL", __func__, so));
4020 * Promoting a socket from incomplete queue to complete, we
4021 * need to go through reverse order of locking. We first do
4022 * trylock, and if that doesn't succeed, we go the hard way
4023 * leaving a reference and rechecking consistency after proper
4026 if (__predict_false(SOLISTEN_TRYLOCK(head) == 0)) {
4029 SOLISTEN_LOCK(head);
4031 if (__predict_false(head != so->so_listen)) {
4033 * The socket went off the listen queue,
4034 * should be lost race to close(2) of sol.
4035 * The socket is about to soabort().
4038 sorele_locked(head);
4041 last = refcount_release(&head->so_count);
4042 KASSERT(!last, ("%s: released last reference for %p",
4046 if ((so->so_options & SO_ACCEPTFILTER) == 0) {
4047 TAILQ_REMOVE(&head->sol_incomp, so, so_list);
4048 head->sol_incqlen--;
4049 TAILQ_INSERT_TAIL(&head->sol_comp, so, so_list);
4051 so->so_qstate = SQ_COMP;
4053 solisten_wakeup(head); /* unlocks */
4055 SOCK_RECVBUF_LOCK(so);
4056 soupcall_set(so, SO_RCV,
4057 head->sol_accept_filter->accf_callback,
4058 head->sol_accept_filter_arg);
4059 so->so_options &= ~SO_ACCEPTFILTER;
4060 ret = head->sol_accept_filter->accf_callback(so,
4061 head->sol_accept_filter_arg, M_NOWAIT);
4062 if (ret == SU_ISCONNECTED) {
4063 soupcall_clear(so, SO_RCV);
4064 SOCK_RECVBUF_UNLOCK(so);
4067 SOCK_RECVBUF_UNLOCK(so);
4069 SOLISTEN_UNLOCK(head);
4074 wakeup(&so->so_timeo);
4080 soisdisconnecting(struct socket *so)
4084 so->so_state &= ~SS_ISCONNECTING;
4085 so->so_state |= SS_ISDISCONNECTING;
4087 if (!SOLISTENING(so)) {
4088 SOCK_RECVBUF_LOCK(so);
4089 socantrcvmore_locked(so);
4090 SOCK_SENDBUF_LOCK(so);
4091 socantsendmore_locked(so);
4094 wakeup(&so->so_timeo);
4098 soisdisconnected(struct socket *so)
4104 * There is at least one reader of so_state that does not
4105 * acquire socket lock, namely soreceive_generic(). Ensure
4106 * that it never sees all flags that track connection status
4107 * cleared, by ordering the update with a barrier semantic of
4108 * our release thread fence.
4110 so->so_state |= SS_ISDISCONNECTED;
4111 atomic_thread_fence_rel();
4112 so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
4114 if (!SOLISTENING(so)) {
4116 SOCK_RECVBUF_LOCK(so);
4117 socantrcvmore_locked(so);
4118 SOCK_SENDBUF_LOCK(so);
4119 sbdrop_locked(&so->so_snd, sbused(&so->so_snd));
4120 socantsendmore_locked(so);
4123 wakeup(&so->so_timeo);
4127 soiolock(struct socket *so, struct sx *sx, int flags)
4131 KASSERT((flags & SBL_VALID) == flags,
4132 ("soiolock: invalid flags %#x", flags));
4134 if ((flags & SBL_WAIT) != 0) {
4135 if ((flags & SBL_NOINTR) != 0) {
4138 error = sx_xlock_sig(sx);
4142 } else if (!sx_try_xlock(sx)) {
4143 return (EWOULDBLOCK);
4146 if (__predict_false(SOLISTENING(so))) {
4154 soiounlock(struct sx *sx)
4160 * Make a copy of a sockaddr in a malloced buffer of type M_SONAME.
4163 sodupsockaddr(const struct sockaddr *sa, int mflags)
4165 struct sockaddr *sa2;
4167 sa2 = malloc(sa->sa_len, M_SONAME, mflags);
4169 bcopy(sa, sa2, sa->sa_len);
4174 * Register per-socket destructor.
4177 sodtor_set(struct socket *so, so_dtor_t *func)
4180 SOCK_LOCK_ASSERT(so);
4185 * Register per-socket buffer upcalls.
4188 soupcall_set(struct socket *so, sb_which which, so_upcall_t func, void *arg)
4192 KASSERT(!SOLISTENING(so), ("%s: so %p listening", __func__, so));
4202 SOCK_BUF_LOCK_ASSERT(so, which);
4203 sb->sb_upcall = func;
4204 sb->sb_upcallarg = arg;
4205 sb->sb_flags |= SB_UPCALL;
4209 soupcall_clear(struct socket *so, sb_which which)
4213 KASSERT(!SOLISTENING(so), ("%s: so %p listening", __func__, so));
4223 SOCK_BUF_LOCK_ASSERT(so, which);
4224 KASSERT(sb->sb_upcall != NULL,
4225 ("%s: so %p no upcall to clear", __func__, so));
4226 sb->sb_upcall = NULL;
4227 sb->sb_upcallarg = NULL;
4228 sb->sb_flags &= ~SB_UPCALL;
4232 solisten_upcall_set(struct socket *so, so_upcall_t func, void *arg)
4235 SOLISTEN_LOCK_ASSERT(so);
4236 so->sol_upcall = func;
4237 so->sol_upcallarg = arg;
4241 so_rdknl_lock(void *arg)
4243 struct socket *so = arg;
4246 if (SOLISTENING(so)) {
4249 SOCK_RECVBUF_LOCK(so);
4250 if (__predict_false(SOLISTENING(so))) {
4251 SOCK_RECVBUF_UNLOCK(so);
4258 so_rdknl_unlock(void *arg)
4260 struct socket *so = arg;
4262 if (SOLISTENING(so))
4263 SOLISTEN_UNLOCK(so);
4265 SOCK_RECVBUF_UNLOCK(so);
4269 so_rdknl_assert_lock(void *arg, int what)
4271 struct socket *so = arg;
4273 if (what == LA_LOCKED) {
4274 if (SOLISTENING(so))
4275 SOLISTEN_LOCK_ASSERT(so);
4277 SOCK_RECVBUF_LOCK_ASSERT(so);
4279 if (SOLISTENING(so))
4280 SOLISTEN_UNLOCK_ASSERT(so);
4282 SOCK_RECVBUF_UNLOCK_ASSERT(so);
4287 so_wrknl_lock(void *arg)
4289 struct socket *so = arg;
4292 if (SOLISTENING(so)) {
4295 SOCK_SENDBUF_LOCK(so);
4296 if (__predict_false(SOLISTENING(so))) {
4297 SOCK_SENDBUF_UNLOCK(so);
4304 so_wrknl_unlock(void *arg)
4306 struct socket *so = arg;
4308 if (SOLISTENING(so))
4309 SOLISTEN_UNLOCK(so);
4311 SOCK_SENDBUF_UNLOCK(so);
4315 so_wrknl_assert_lock(void *arg, int what)
4317 struct socket *so = arg;
4319 if (what == LA_LOCKED) {
4320 if (SOLISTENING(so))
4321 SOLISTEN_LOCK_ASSERT(so);
4323 SOCK_SENDBUF_LOCK_ASSERT(so);
4325 if (SOLISTENING(so))
4326 SOLISTEN_UNLOCK_ASSERT(so);
4328 SOCK_SENDBUF_UNLOCK_ASSERT(so);
4333 * Create an external-format (``xsocket'') structure using the information in
4334 * the kernel-format socket structure pointed to by so. This is done to
4335 * reduce the spew of irrelevant information over this interface, to isolate
4336 * user code from changes in the kernel structure, and potentially to provide
4337 * information-hiding if we decide that some of this information should be
4338 * hidden from users.
4341 sotoxsocket(struct socket *so, struct xsocket *xso)
4344 bzero(xso, sizeof(*xso));
4345 xso->xso_len = sizeof *xso;
4346 xso->xso_so = (uintptr_t)so;
4347 xso->so_type = so->so_type;
4348 xso->so_options = so->so_options;
4349 xso->so_linger = so->so_linger;
4350 xso->so_state = so->so_state;
4351 xso->so_pcb = (uintptr_t)so->so_pcb;
4352 xso->xso_protocol = so->so_proto->pr_protocol;
4353 xso->xso_family = so->so_proto->pr_domain->dom_family;
4354 xso->so_timeo = so->so_timeo;
4355 xso->so_error = so->so_error;
4356 xso->so_uid = so->so_cred->cr_uid;
4357 xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
4358 if (SOLISTENING(so)) {
4359 xso->so_qlen = so->sol_qlen;
4360 xso->so_incqlen = so->sol_incqlen;
4361 xso->so_qlimit = so->sol_qlimit;
4362 xso->so_oobmark = 0;
4364 xso->so_state |= so->so_qstate;
4365 xso->so_qlen = xso->so_incqlen = xso->so_qlimit = 0;
4366 xso->so_oobmark = so->so_oobmark;
4367 sbtoxsockbuf(&so->so_snd, &xso->so_snd);
4368 sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
4373 so_sockbuf_rcv(struct socket *so)
4376 return (&so->so_rcv);
4380 so_sockbuf_snd(struct socket *so)
4383 return (&so->so_snd);
4387 so_state_get(const struct socket *so)
4390 return (so->so_state);
4394 so_state_set(struct socket *so, int val)
4401 so_options_get(const struct socket *so)
4404 return (so->so_options);
4408 so_options_set(struct socket *so, int val)
4411 so->so_options = val;
4415 so_error_get(const struct socket *so)
4418 return (so->so_error);
4422 so_error_set(struct socket *so, int val)
4429 so_linger_get(const struct socket *so)
4432 return (so->so_linger);
4436 so_linger_set(struct socket *so, int val)
4439 KASSERT(val >= 0 && val <= USHRT_MAX && val <= (INT_MAX / hz),
4440 ("%s: val %d out of range", __func__, val));
4442 so->so_linger = val;
4446 so_protosw_get(const struct socket *so)
4449 return (so->so_proto);
4453 so_protosw_set(struct socket *so, struct protosw *val)
4460 so_sorwakeup(struct socket *so)
4467 so_sowwakeup(struct socket *so)
4474 so_sorwakeup_locked(struct socket *so)
4477 sorwakeup_locked(so);
4481 so_sowwakeup_locked(struct socket *so)
4484 sowwakeup_locked(so);
4488 so_lock(struct socket *so)
4495 so_unlock(struct socket *so)