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_compat.h"
111 #include "opt_sctp.h"
113 #include <sys/param.h>
114 #include <sys/systm.h>
115 #include <sys/fcntl.h>
116 #include <sys/limits.h>
117 #include <sys/lock.h>
119 #include <sys/malloc.h>
120 #include <sys/mbuf.h>
121 #include <sys/mutex.h>
122 #include <sys/domain.h>
123 #include <sys/file.h> /* for struct knote */
124 #include <sys/hhook.h>
125 #include <sys/kernel.h>
126 #include <sys/khelp.h>
127 #include <sys/event.h>
128 #include <sys/eventhandler.h>
129 #include <sys/poll.h>
130 #include <sys/proc.h>
131 #include <sys/protosw.h>
132 #include <sys/socket.h>
133 #include <sys/socketvar.h>
134 #include <sys/resourcevar.h>
135 #include <net/route.h>
136 #include <sys/signalvar.h>
137 #include <sys/stat.h>
139 #include <sys/sysctl.h>
140 #include <sys/taskqueue.h>
142 #include <sys/jail.h>
143 #include <sys/syslog.h>
144 #include <netinet/in.h>
146 #include <net/vnet.h>
148 #include <security/mac/mac_framework.h>
152 #ifdef COMPAT_FREEBSD32
153 #include <sys/mount.h>
154 #include <sys/sysent.h>
155 #include <compat/freebsd32/freebsd32.h>
158 static int soreceive_rcvoob(struct socket *so, struct uio *uio,
160 static void so_rdknl_lock(void *);
161 static void so_rdknl_unlock(void *);
162 static void so_rdknl_assert_locked(void *);
163 static void so_rdknl_assert_unlocked(void *);
164 static void so_wrknl_lock(void *);
165 static void so_wrknl_unlock(void *);
166 static void so_wrknl_assert_locked(void *);
167 static void so_wrknl_assert_unlocked(void *);
169 static void filt_sordetach(struct knote *kn);
170 static int filt_soread(struct knote *kn, long hint);
171 static void filt_sowdetach(struct knote *kn);
172 static int filt_sowrite(struct knote *kn, long hint);
173 static int filt_soempty(struct knote *kn, long hint);
174 static int inline hhook_run_socket(struct socket *so, void *hctx, int32_t h_id);
175 fo_kqfilter_t soo_kqfilter;
177 static struct filterops soread_filtops = {
179 .f_detach = filt_sordetach,
180 .f_event = filt_soread,
182 static struct filterops sowrite_filtops = {
184 .f_detach = filt_sowdetach,
185 .f_event = filt_sowrite,
187 static struct filterops soempty_filtops = {
189 .f_detach = filt_sowdetach,
190 .f_event = filt_soempty,
193 so_gen_t so_gencnt; /* generation count for sockets */
195 MALLOC_DEFINE(M_SONAME, "soname", "socket name");
196 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
198 #define VNET_SO_ASSERT(so) \
199 VNET_ASSERT(curvnet != NULL, \
200 ("%s:%d curvnet is NULL, so=%p", __func__, __LINE__, (so)));
202 VNET_DEFINE(struct hhook_head *, socket_hhh[HHOOK_SOCKET_LAST + 1]);
203 #define V_socket_hhh VNET(socket_hhh)
206 * Limit on the number of connections in the listen queue waiting
208 * NB: The original sysctl somaxconn is still available but hidden
209 * to prevent confusion about the actual purpose of this number.
211 static u_int somaxconn = SOMAXCONN;
214 sysctl_somaxconn(SYSCTL_HANDLER_ARGS)
220 error = sysctl_handle_int(oidp, &val, 0, req);
221 if (error || !req->newptr )
225 * The purpose of the UINT_MAX / 3 limit, is so that the formula
227 * below, will not overflow.
230 if (val < 1 || val > UINT_MAX / 3)
236 SYSCTL_PROC(_kern_ipc, OID_AUTO, soacceptqueue, CTLTYPE_UINT | CTLFLAG_RW,
237 0, sizeof(int), sysctl_somaxconn, "I",
238 "Maximum listen socket pending connection accept queue size");
239 SYSCTL_PROC(_kern_ipc, KIPC_SOMAXCONN, somaxconn,
240 CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_SKIP,
241 0, sizeof(int), sysctl_somaxconn, "I",
242 "Maximum listen socket pending connection accept queue size (compat)");
244 static int numopensockets;
245 SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD,
246 &numopensockets, 0, "Number of open sockets");
249 * accept_mtx locks down per-socket fields relating to accept queues. See
250 * socketvar.h for an annotation of the protected fields of struct socket.
252 struct mtx accept_mtx;
253 MTX_SYSINIT(accept_mtx, &accept_mtx, "accept", MTX_DEF);
256 * so_global_mtx protects so_gencnt, numopensockets, and the per-socket
259 static struct mtx so_global_mtx;
260 MTX_SYSINIT(so_global_mtx, &so_global_mtx, "so_glabel", MTX_DEF);
263 * General IPC sysctl name space, used by sockets and a variety of other IPC
266 SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW, 0, "IPC");
269 * Initialize the socket subsystem and set up the socket
272 static uma_zone_t socket_zone;
276 socket_zone_change(void *tag)
279 maxsockets = uma_zone_set_max(socket_zone, maxsockets);
283 socket_hhook_register(int subtype)
286 if (hhook_head_register(HHOOK_TYPE_SOCKET, subtype,
287 &V_socket_hhh[subtype],
288 HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
289 printf("%s: WARNING: unable to register hook\n", __func__);
293 socket_hhook_deregister(int subtype)
296 if (hhook_head_deregister(V_socket_hhh[subtype]) != 0)
297 printf("%s: WARNING: unable to deregister hook\n", __func__);
301 socket_init(void *tag)
304 socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL,
305 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
306 maxsockets = uma_zone_set_max(socket_zone, maxsockets);
307 uma_zone_set_warning(socket_zone, "kern.ipc.maxsockets limit reached");
308 EVENTHANDLER_REGISTER(maxsockets_change, socket_zone_change, NULL,
309 EVENTHANDLER_PRI_FIRST);
311 SYSINIT(socket, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, socket_init, NULL);
314 socket_vnet_init(const void *unused __unused)
318 /* We expect a contiguous range */
319 for (i = 0; i <= HHOOK_SOCKET_LAST; i++)
320 socket_hhook_register(i);
322 VNET_SYSINIT(socket_vnet_init, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY,
323 socket_vnet_init, NULL);
326 socket_vnet_uninit(const void *unused __unused)
330 for (i = 0; i <= HHOOK_SOCKET_LAST; i++)
331 socket_hhook_deregister(i);
333 VNET_SYSUNINIT(socket_vnet_uninit, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY,
334 socket_vnet_uninit, NULL);
337 * Initialise maxsockets. This SYSINIT must be run after
341 init_maxsockets(void *ignored)
344 TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
345 maxsockets = imax(maxsockets, maxfiles);
347 SYSINIT(param, SI_SUB_TUNABLES, SI_ORDER_ANY, init_maxsockets, NULL);
350 * Sysctl to get and set the maximum global sockets limit. Notify protocols
351 * of the change so that they can update their dependent limits as required.
354 sysctl_maxsockets(SYSCTL_HANDLER_ARGS)
356 int error, newmaxsockets;
358 newmaxsockets = maxsockets;
359 error = sysctl_handle_int(oidp, &newmaxsockets, 0, req);
360 if (error == 0 && req->newptr) {
361 if (newmaxsockets > maxsockets &&
362 newmaxsockets <= maxfiles) {
363 maxsockets = newmaxsockets;
364 EVENTHANDLER_INVOKE(maxsockets_change);
370 SYSCTL_PROC(_kern_ipc, OID_AUTO, maxsockets, CTLTYPE_INT|CTLFLAG_RW,
371 &maxsockets, 0, sysctl_maxsockets, "IU",
372 "Maximum number of sockets available");
375 * Socket operation routines. These routines are called by the routines in
376 * sys_socket.c or from a system process, and implement the semantics of
377 * socket operations by switching out to the protocol specific routines.
381 * Get a socket structure from our zone, and initialize it. Note that it
382 * would probably be better to allocate socket and PCB at the same time, but
383 * I'm not convinced that all the protocols can be easily modified to do
386 * soalloc() returns a socket with a ref count of 0.
388 static struct socket *
389 soalloc(struct vnet *vnet)
393 so = uma_zalloc(socket_zone, M_NOWAIT | M_ZERO);
397 if (mac_socket_init(so, M_NOWAIT) != 0) {
398 uma_zfree(socket_zone, so);
402 if (khelp_init_osd(HELPER_CLASS_SOCKET, &so->osd)) {
403 uma_zfree(socket_zone, so);
408 * The socket locking protocol allows to lock 2 sockets at a time,
409 * however, the first one must be a listening socket. WITNESS lacks
410 * a feature to change class of an existing lock, so we use DUPOK.
412 mtx_init(&so->so_lock, "socket", NULL, MTX_DEF | MTX_DUPOK);
413 SOCKBUF_LOCK_INIT(&so->so_snd, "so_snd");
414 SOCKBUF_LOCK_INIT(&so->so_rcv, "so_rcv");
415 so->so_rcv.sb_sel = &so->so_rdsel;
416 so->so_snd.sb_sel = &so->so_wrsel;
417 sx_init(&so->so_snd.sb_sx, "so_snd_sx");
418 sx_init(&so->so_rcv.sb_sx, "so_rcv_sx");
419 TAILQ_INIT(&so->so_snd.sb_aiojobq);
420 TAILQ_INIT(&so->so_rcv.sb_aiojobq);
421 TASK_INIT(&so->so_snd.sb_aiotask, 0, soaio_snd, so);
422 TASK_INIT(&so->so_rcv.sb_aiotask, 0, soaio_rcv, so);
424 VNET_ASSERT(vnet != NULL, ("%s:%d vnet is NULL, so=%p",
425 __func__, __LINE__, so));
428 /* We shouldn't need the so_global_mtx */
429 if (hhook_run_socket(so, NULL, HHOOK_SOCKET_CREATE)) {
430 /* Do we need more comprehensive error returns? */
431 uma_zfree(socket_zone, so);
434 mtx_lock(&so_global_mtx);
435 so->so_gencnt = ++so_gencnt;
438 vnet->vnet_sockcnt++;
440 mtx_unlock(&so_global_mtx);
446 * Free the storage associated with a socket at the socket layer, tear down
447 * locks, labels, etc. All protocol state is assumed already to have been
448 * torn down (and possibly never set up) by the caller.
451 sodealloc(struct socket *so)
454 KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count));
455 KASSERT(so->so_pcb == NULL, ("sodealloc(): so_pcb != NULL"));
457 mtx_lock(&so_global_mtx);
458 so->so_gencnt = ++so_gencnt;
459 --numopensockets; /* Could be below, but faster here. */
461 VNET_ASSERT(so->so_vnet != NULL, ("%s:%d so_vnet is NULL, so=%p",
462 __func__, __LINE__, so));
463 so->so_vnet->vnet_sockcnt--;
465 mtx_unlock(&so_global_mtx);
467 mac_socket_destroy(so);
469 hhook_run_socket(so, NULL, HHOOK_SOCKET_CLOSE);
472 khelp_destroy_osd(&so->osd);
473 if (SOLISTENING(so)) {
474 if (so->sol_accept_filter != NULL)
475 accept_filt_setopt(so, NULL);
477 if (so->so_rcv.sb_hiwat)
478 (void)chgsbsize(so->so_cred->cr_uidinfo,
479 &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
480 if (so->so_snd.sb_hiwat)
481 (void)chgsbsize(so->so_cred->cr_uidinfo,
482 &so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
483 sx_destroy(&so->so_snd.sb_sx);
484 sx_destroy(&so->so_rcv.sb_sx);
485 SOCKBUF_LOCK_DESTROY(&so->so_snd);
486 SOCKBUF_LOCK_DESTROY(&so->so_rcv);
488 mtx_destroy(&so->so_lock);
489 uma_zfree(socket_zone, so);
493 * socreate returns a socket with a ref count of 1. The socket should be
494 * closed with soclose().
497 socreate(int dom, struct socket **aso, int type, int proto,
498 struct ucred *cred, struct thread *td)
505 prp = pffindproto(dom, proto, type);
507 prp = pffindtype(dom, type);
510 /* No support for domain. */
511 if (pffinddomain(dom) == NULL)
512 return (EAFNOSUPPORT);
513 /* No support for socket type. */
514 if (proto == 0 && type != 0)
516 return (EPROTONOSUPPORT);
518 if (prp->pr_usrreqs->pru_attach == NULL ||
519 prp->pr_usrreqs->pru_attach == pru_attach_notsupp)
520 return (EPROTONOSUPPORT);
522 if (prison_check_af(cred, prp->pr_domain->dom_family) != 0)
523 return (EPROTONOSUPPORT);
525 if (prp->pr_type != type)
527 so = soalloc(CRED_TO_VNET(cred));
532 so->so_cred = crhold(cred);
533 if ((prp->pr_domain->dom_family == PF_INET) ||
534 (prp->pr_domain->dom_family == PF_INET6) ||
535 (prp->pr_domain->dom_family == PF_ROUTE))
536 so->so_fibnum = td->td_proc->p_fibnum;
541 mac_socket_create(cred, so);
543 knlist_init(&so->so_rdsel.si_note, so, so_rdknl_lock, so_rdknl_unlock,
544 so_rdknl_assert_locked, so_rdknl_assert_unlocked);
545 knlist_init(&so->so_wrsel.si_note, so, so_wrknl_lock, so_wrknl_unlock,
546 so_wrknl_assert_locked, so_wrknl_assert_unlocked);
548 * Auto-sizing of socket buffers is managed by the protocols and
549 * the appropriate flags must be set in the pru_attach function.
551 CURVNET_SET(so->so_vnet);
552 error = (*prp->pr_usrreqs->pru_attach)(so, proto, td);
564 static int regression_sonewconn_earlytest = 1;
565 SYSCTL_INT(_regression, OID_AUTO, sonewconn_earlytest, CTLFLAG_RW,
566 ®ression_sonewconn_earlytest, 0, "Perform early sonewconn limit test");
570 * When an attempt at a new connection is noted on a socket which accepts
571 * connections, sonewconn is called. If the connection is possible (subject
572 * to space constraints, etc.) then we allocate a new structure, properly
573 * linked into the data structure of the original socket, and return this.
574 * Connstatus may be 0, or SS_ISCONFIRMING, or SS_ISCONNECTED.
576 * Note: the ref count on the socket is 0 on return.
579 sonewconn(struct socket *head, int connstatus)
581 static struct timeval lastover;
582 static struct timeval overinterval = { 60, 0 };
583 static int overcount;
589 over = (head->sol_qlen > 3 * head->sol_qlimit / 2);
590 SOLISTEN_UNLOCK(head);
592 if (regression_sonewconn_earlytest && over) {
598 if (ratecheck(&lastover, &overinterval)) {
599 log(LOG_DEBUG, "%s: pcb %p: Listen queue overflow: "
600 "%i already in queue awaiting acceptance "
601 "(%d occurrences)\n",
602 __func__, head->so_pcb, head->sol_qlen, overcount);
609 VNET_ASSERT(head->so_vnet != NULL, ("%s: so %p vnet is NULL",
611 so = soalloc(head->so_vnet);
613 log(LOG_DEBUG, "%s: pcb %p: New socket allocation failure: "
614 "limit reached or out of memory\n",
615 __func__, head->so_pcb);
618 so->so_listen = head;
619 so->so_type = head->so_type;
620 so->so_linger = head->so_linger;
621 so->so_state = head->so_state | SS_NOFDREF;
622 so->so_fibnum = head->so_fibnum;
623 so->so_proto = head->so_proto;
624 so->so_cred = crhold(head->so_cred);
626 mac_socket_newconn(head, so);
628 knlist_init(&so->so_rdsel.si_note, so, so_rdknl_lock, so_rdknl_unlock,
629 so_rdknl_assert_locked, so_rdknl_assert_unlocked);
630 knlist_init(&so->so_wrsel.si_note, so, so_wrknl_lock, so_wrknl_unlock,
631 so_wrknl_assert_locked, so_wrknl_assert_unlocked);
632 VNET_SO_ASSERT(head);
633 if (soreserve(so, head->sol_sbsnd_hiwat, head->sol_sbrcv_hiwat)) {
635 log(LOG_DEBUG, "%s: pcb %p: soreserve() failed\n",
636 __func__, head->so_pcb);
639 if ((*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
641 log(LOG_DEBUG, "%s: pcb %p: pru_attach() failed\n",
642 __func__, head->so_pcb);
645 so->so_rcv.sb_lowat = head->sol_sbrcv_lowat;
646 so->so_snd.sb_lowat = head->sol_sbsnd_lowat;
647 so->so_rcv.sb_timeo = head->sol_sbrcv_timeo;
648 so->so_snd.sb_timeo = head->sol_sbsnd_timeo;
649 so->so_rcv.sb_flags |= head->sol_sbrcv_flags & SB_AUTOSIZE;
650 so->so_snd.sb_flags |= head->sol_sbsnd_flags & SB_AUTOSIZE;
653 if (head->sol_accept_filter != NULL)
655 so->so_state |= connstatus;
656 so->so_options = head->so_options & ~SO_ACCEPTCONN;
657 soref(head); /* A socket on (in)complete queue refs head. */
659 TAILQ_INSERT_TAIL(&head->sol_comp, so, so_list);
660 so->so_qstate = SQ_COMP;
662 solisten_wakeup(head); /* unlocks */
665 * Keep removing sockets from the head until there's room for
666 * us to insert on the tail. In pre-locking revisions, this
667 * was a simple if(), but as we could be racing with other
668 * threads and soabort() requires dropping locks, we must
669 * loop waiting for the condition to be true.
671 while (head->sol_incqlen > head->sol_qlimit) {
674 sp = TAILQ_FIRST(&head->sol_incomp);
675 TAILQ_REMOVE(&head->sol_incomp, sp, so_list);
678 sp->so_qstate = SQ_NONE;
679 sp->so_listen = NULL;
681 sorele(head); /* does SOLISTEN_UNLOCK, head stays */
685 TAILQ_INSERT_TAIL(&head->sol_incomp, so, so_list);
686 so->so_qstate = SQ_INCOMP;
688 SOLISTEN_UNLOCK(head);
695 * Socket part of sctp_peeloff(). Detach a new socket from an
696 * association. The new socket is returned with a reference.
699 sopeeloff(struct socket *head)
703 VNET_ASSERT(head->so_vnet != NULL, ("%s:%d so_vnet is NULL, head=%p",
704 __func__, __LINE__, head));
705 so = soalloc(head->so_vnet);
707 log(LOG_DEBUG, "%s: pcb %p: New socket allocation failure: "
708 "limit reached or out of memory\n",
709 __func__, head->so_pcb);
712 so->so_type = head->so_type;
713 so->so_options = head->so_options;
714 so->so_linger = head->so_linger;
715 so->so_state = (head->so_state & SS_NBIO) | SS_ISCONNECTED;
716 so->so_fibnum = head->so_fibnum;
717 so->so_proto = head->so_proto;
718 so->so_cred = crhold(head->so_cred);
720 mac_socket_newconn(head, so);
722 knlist_init(&so->so_rdsel.si_note, so, so_rdknl_lock, so_rdknl_unlock,
723 so_rdknl_assert_locked, so_rdknl_assert_unlocked);
724 knlist_init(&so->so_wrsel.si_note, so, so_wrknl_lock, so_wrknl_unlock,
725 so_wrknl_assert_locked, so_wrknl_assert_unlocked);
726 VNET_SO_ASSERT(head);
727 if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat)) {
729 log(LOG_DEBUG, "%s: pcb %p: soreserve() failed\n",
730 __func__, head->so_pcb);
733 if ((*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
735 log(LOG_DEBUG, "%s: pcb %p: pru_attach() failed\n",
736 __func__, head->so_pcb);
739 so->so_rcv.sb_lowat = head->so_rcv.sb_lowat;
740 so->so_snd.sb_lowat = head->so_snd.sb_lowat;
741 so->so_rcv.sb_timeo = head->so_rcv.sb_timeo;
742 so->so_snd.sb_timeo = head->so_snd.sb_timeo;
743 so->so_rcv.sb_flags |= head->so_rcv.sb_flags & SB_AUTOSIZE;
744 so->so_snd.sb_flags |= head->so_snd.sb_flags & SB_AUTOSIZE;
753 sobind(struct socket *so, struct sockaddr *nam, struct thread *td)
757 CURVNET_SET(so->so_vnet);
758 error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td);
764 sobindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
768 CURVNET_SET(so->so_vnet);
769 error = (*so->so_proto->pr_usrreqs->pru_bindat)(fd, so, nam, td);
775 * solisten() transitions a socket from a non-listening state to a listening
776 * state, but can also be used to update the listen queue depth on an
777 * existing listen socket. The protocol will call back into the sockets
778 * layer using solisten_proto_check() and solisten_proto() to check and set
779 * socket-layer listen state. Call backs are used so that the protocol can
780 * acquire both protocol and socket layer locks in whatever order is required
783 * Protocol implementors are advised to hold the socket lock across the
784 * socket-layer test and set to avoid races at the socket layer.
787 solisten(struct socket *so, int backlog, struct thread *td)
791 CURVNET_SET(so->so_vnet);
792 error = (*so->so_proto->pr_usrreqs->pru_listen)(so, backlog, td);
798 solisten_proto_check(struct socket *so)
801 SOCK_LOCK_ASSERT(so);
803 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
810 solisten_proto(struct socket *so, int backlog)
812 int sbrcv_lowat, sbsnd_lowat;
813 u_int sbrcv_hiwat, sbsnd_hiwat;
814 short sbrcv_flags, sbsnd_flags;
815 sbintime_t sbrcv_timeo, sbsnd_timeo;
817 SOCK_LOCK_ASSERT(so);
823 * Change this socket to listening state.
825 sbrcv_lowat = so->so_rcv.sb_lowat;
826 sbsnd_lowat = so->so_snd.sb_lowat;
827 sbrcv_hiwat = so->so_rcv.sb_hiwat;
828 sbsnd_hiwat = so->so_snd.sb_hiwat;
829 sbrcv_flags = so->so_rcv.sb_flags;
830 sbsnd_flags = so->so_snd.sb_flags;
831 sbrcv_timeo = so->so_rcv.sb_timeo;
832 sbsnd_timeo = so->so_snd.sb_timeo;
834 sbdestroy(&so->so_snd, so);
835 sbdestroy(&so->so_rcv, so);
836 sx_destroy(&so->so_snd.sb_sx);
837 sx_destroy(&so->so_rcv.sb_sx);
838 SOCKBUF_LOCK_DESTROY(&so->so_snd);
839 SOCKBUF_LOCK_DESTROY(&so->so_rcv);
843 sizeof(struct socket) - offsetof(struct socket, so_rcv));
846 so->sol_sbrcv_lowat = sbrcv_lowat;
847 so->sol_sbsnd_lowat = sbsnd_lowat;
848 so->sol_sbrcv_hiwat = sbrcv_hiwat;
849 so->sol_sbsnd_hiwat = sbsnd_hiwat;
850 so->sol_sbrcv_flags = sbrcv_flags;
851 so->sol_sbsnd_flags = sbsnd_flags;
852 so->sol_sbrcv_timeo = sbrcv_timeo;
853 so->sol_sbsnd_timeo = sbsnd_timeo;
855 so->sol_qlen = so->sol_incqlen = 0;
856 TAILQ_INIT(&so->sol_incomp);
857 TAILQ_INIT(&so->sol_comp);
859 so->sol_accept_filter = NULL;
860 so->sol_accept_filter_arg = NULL;
861 so->sol_accept_filter_str = NULL;
863 so->sol_upcall = NULL;
864 so->sol_upcallarg = NULL;
866 so->so_options |= SO_ACCEPTCONN;
869 if (backlog < 0 || backlog > somaxconn)
871 so->sol_qlimit = backlog;
875 * Wakeup listeners/subsystems once we have a complete connection.
876 * Enters with lock, returns unlocked.
879 solisten_wakeup(struct socket *sol)
882 if (sol->sol_upcall != NULL)
883 (void )sol->sol_upcall(sol, sol->sol_upcallarg, M_NOWAIT);
885 selwakeuppri(&sol->so_rdsel, PSOCK);
886 KNOTE_LOCKED(&sol->so_rdsel.si_note, 0);
888 SOLISTEN_UNLOCK(sol);
889 wakeup_one(&sol->sol_comp);
893 * Return single connection off a listening socket queue. Main consumer of
894 * the function is kern_accept4(). Some modules, that do their own accept
895 * management also use the function.
897 * Listening socket must be locked on entry and is returned unlocked on
899 * The flags argument is set of accept4(2) flags and ACCEPT4_INHERIT.
902 solisten_dequeue(struct socket *head, struct socket **ret, int flags)
907 SOLISTEN_LOCK_ASSERT(head);
909 while (!(head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->sol_comp) &&
910 head->so_error == 0) {
911 error = msleep(&head->sol_comp, &head->so_lock, PSOCK | PCATCH,
914 SOLISTEN_UNLOCK(head);
918 if (head->so_error) {
919 error = head->so_error;
921 SOLISTEN_UNLOCK(head);
924 if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->sol_comp)) {
925 SOLISTEN_UNLOCK(head);
926 return (EWOULDBLOCK);
928 so = TAILQ_FIRST(&head->sol_comp);
930 KASSERT(so->so_qstate == SQ_COMP,
931 ("%s: so %p not SQ_COMP", __func__, so));
934 so->so_qstate = SQ_NONE;
935 so->so_listen = NULL;
936 TAILQ_REMOVE(&head->sol_comp, so, so_list);
937 if (flags & ACCEPT4_INHERIT)
938 so->so_state |= (head->so_state & SS_NBIO);
940 so->so_state |= (flags & SOCK_NONBLOCK) ? SS_NBIO : 0;
949 * Evaluate the reference count and named references on a socket; if no
950 * references remain, free it. This should be called whenever a reference is
951 * released, such as in sorele(), but also when named reference flags are
952 * cleared in socket or protocol code.
954 * sofree() will free the socket if:
956 * - There are no outstanding file descriptor references or related consumers
959 * - The socket has been closed by user space, if ever open (SS_NOFDREF).
961 * - The protocol does not have an outstanding strong reference on the socket
964 * - The socket is not in a completed connection queue, so a process has been
965 * notified that it is present. If it is removed, the user process may
966 * block in accept() despite select() saying the socket was ready.
969 sofree(struct socket *so)
971 struct protosw *pr = so->so_proto;
973 SOCK_LOCK_ASSERT(so);
975 if ((so->so_state & SS_NOFDREF) == 0 || so->so_count != 0 ||
976 (so->so_state & SS_PROTOREF) || (so->so_qstate == SQ_COMP)) {
981 if (!SOLISTENING(so) && so->so_qstate == SQ_INCOMP) {
985 KASSERT(sol, ("%s: so %p on incomp of NULL", __func__, so));
988 * To solve race between close of a listening socket and
989 * a socket on its incomplete queue, we need to lock both.
990 * The order is first listening socket, then regular.
991 * Since we don't have SS_NOFDREF neither SS_PROTOREF, this
992 * function and the listening socket are the only pointers
993 * to so. To preserve so and sol, we reference both and then
995 * After relock the socket may not move to so_comp since it
996 * doesn't have PCB already, but it may be removed from
997 * so_incomp. If that happens, we share responsiblity on
998 * freeing the socket, but soclose() has already removed
1006 if (so->so_qstate == SQ_INCOMP) {
1007 KASSERT(so->so_listen == sol,
1008 ("%s: so %p migrated out of sol %p",
1009 __func__, so, sol));
1010 TAILQ_REMOVE(&sol->sol_incomp, so, so_list);
1012 /* This is guarenteed not to be the last. */
1013 refcount_release(&sol->so_count);
1014 so->so_qstate = SQ_NONE;
1015 so->so_listen = NULL;
1017 KASSERT(so->so_listen == NULL,
1018 ("%s: so %p not on (in)comp with so_listen",
1021 KASSERT(so->so_count == 1,
1022 ("%s: so %p count %u", __func__, so, so->so_count));
1025 if (SOLISTENING(so))
1026 so->so_error = ECONNABORTED;
1030 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
1031 (*pr->pr_domain->dom_dispose)(so);
1032 if (pr->pr_usrreqs->pru_detach != NULL)
1033 (*pr->pr_usrreqs->pru_detach)(so);
1036 * From this point on, we assume that no other references to this
1037 * socket exist anywhere else in the stack. Therefore, no locks need
1038 * to be acquired or held.
1040 * We used to do a lot of socket buffer and socket locking here, as
1041 * well as invoke sorflush() and perform wakeups. The direct call to
1042 * dom_dispose() and sbrelease_internal() are an inlining of what was
1043 * necessary from sorflush().
1045 * Notice that the socket buffer and kqueue state are torn down
1046 * before calling pru_detach. This means that protocols shold not
1047 * assume they can perform socket wakeups, etc, in their detach code.
1049 if (!SOLISTENING(so)) {
1050 sbdestroy(&so->so_snd, so);
1051 sbdestroy(&so->so_rcv, so);
1053 seldrain(&so->so_rdsel);
1054 seldrain(&so->so_wrsel);
1055 knlist_destroy(&so->so_rdsel.si_note);
1056 knlist_destroy(&so->so_wrsel.si_note);
1061 * Close a socket on last file table reference removal. Initiate disconnect
1062 * if connected. Free socket when disconnect complete.
1064 * This function will sorele() the socket. Note that soclose() may be called
1065 * prior to the ref count reaching zero. The actual socket structure will
1066 * not be freed until the ref count reaches zero.
1069 soclose(struct socket *so)
1071 struct accept_queue lqueue;
1075 KASSERT(!(so->so_state & SS_NOFDREF), ("soclose: SS_NOFDREF on enter"));
1077 CURVNET_SET(so->so_vnet);
1078 funsetown(&so->so_sigio);
1079 if (so->so_state & SS_ISCONNECTED) {
1080 if ((so->so_state & SS_ISDISCONNECTING) == 0) {
1081 error = sodisconnect(so);
1083 if (error == ENOTCONN)
1088 if (so->so_options & SO_LINGER) {
1089 if ((so->so_state & SS_ISDISCONNECTING) &&
1090 (so->so_state & SS_NBIO))
1092 while (so->so_state & SS_ISCONNECTED) {
1093 error = tsleep(&so->so_timeo,
1094 PSOCK | PCATCH, "soclos",
1095 so->so_linger * hz);
1103 if (so->so_proto->pr_usrreqs->pru_close != NULL)
1104 (*so->so_proto->pr_usrreqs->pru_close)(so);
1107 if ((listening = (so->so_options & SO_ACCEPTCONN))) {
1110 TAILQ_INIT(&lqueue);
1111 TAILQ_SWAP(&lqueue, &so->sol_incomp, socket, so_list);
1112 TAILQ_CONCAT(&lqueue, &so->sol_comp, so_list);
1114 so->sol_qlen = so->sol_incqlen = 0;
1116 TAILQ_FOREACH(sp, &lqueue, so_list) {
1118 sp->so_qstate = SQ_NONE;
1119 sp->so_listen = NULL;
1121 /* Guaranteed not to be the last. */
1122 refcount_release(&so->so_count);
1125 KASSERT((so->so_state & SS_NOFDREF) == 0, ("soclose: NOFDREF"));
1126 so->so_state |= SS_NOFDREF;
1131 TAILQ_FOREACH(sp, &lqueue, so_list) {
1133 if (sp->so_count == 0) {
1137 /* sp is now in sofree() */
1146 * soabort() is used to abruptly tear down a connection, such as when a
1147 * resource limit is reached (listen queue depth exceeded), or if a listen
1148 * socket is closed while there are sockets waiting to be accepted.
1150 * This interface is tricky, because it is called on an unreferenced socket,
1151 * and must be called only by a thread that has actually removed the socket
1152 * from the listen queue it was on, or races with other threads are risked.
1154 * This interface will call into the protocol code, so must not be called
1155 * with any socket locks held. Protocols do call it while holding their own
1156 * recursible protocol mutexes, but this is something that should be subject
1157 * to review in the future.
1160 soabort(struct socket *so)
1164 * In as much as is possible, assert that no references to this
1165 * socket are held. This is not quite the same as asserting that the
1166 * current thread is responsible for arranging for no references, but
1167 * is as close as we can get for now.
1169 KASSERT(so->so_count == 0, ("soabort: so_count"));
1170 KASSERT((so->so_state & SS_PROTOREF) == 0, ("soabort: SS_PROTOREF"));
1171 KASSERT(so->so_state & SS_NOFDREF, ("soabort: !SS_NOFDREF"));
1172 KASSERT(so->so_qstate == SQ_NONE, ("soabort: !SQ_NONE"));
1175 if (so->so_proto->pr_usrreqs->pru_abort != NULL)
1176 (*so->so_proto->pr_usrreqs->pru_abort)(so);
1182 soaccept(struct socket *so, struct sockaddr **nam)
1187 KASSERT((so->so_state & SS_NOFDREF) != 0, ("soaccept: !NOFDREF"));
1188 so->so_state &= ~SS_NOFDREF;
1191 CURVNET_SET(so->so_vnet);
1192 error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam);
1198 soconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
1201 return (soconnectat(AT_FDCWD, so, nam, td));
1205 soconnectat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
1209 if (so->so_options & SO_ACCEPTCONN)
1210 return (EOPNOTSUPP);
1212 CURVNET_SET(so->so_vnet);
1214 * If protocol is connection-based, can only connect once.
1215 * Otherwise, if connected, try to disconnect first. This allows
1216 * user to disconnect by connecting to, e.g., a null address.
1218 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
1219 ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
1220 (error = sodisconnect(so)))) {
1224 * Prevent accumulated error from previous connection from
1228 if (fd == AT_FDCWD) {
1229 error = (*so->so_proto->pr_usrreqs->pru_connect)(so,
1232 error = (*so->so_proto->pr_usrreqs->pru_connectat)(fd,
1242 soconnect2(struct socket *so1, struct socket *so2)
1246 CURVNET_SET(so1->so_vnet);
1247 error = (*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2);
1253 sodisconnect(struct socket *so)
1257 if ((so->so_state & SS_ISCONNECTED) == 0)
1259 if (so->so_state & SS_ISDISCONNECTING)
1262 error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so);
1266 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? 0 : SBL_WAIT)
1269 sosend_dgram(struct socket *so, struct sockaddr *addr, struct uio *uio,
1270 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1274 int clen = 0, error, dontroute;
1276 KASSERT(so->so_type == SOCK_DGRAM, ("sosend_dgram: !SOCK_DGRAM"));
1277 KASSERT(so->so_proto->pr_flags & PR_ATOMIC,
1278 ("sosend_dgram: !PR_ATOMIC"));
1281 resid = uio->uio_resid;
1283 resid = top->m_pkthdr.len;
1285 * In theory resid should be unsigned. However, space must be
1286 * signed, as it might be less than 0 if we over-committed, and we
1287 * must use a signed comparison of space and resid. On the other
1288 * hand, a negative resid causes us to loop sending 0-length
1289 * segments to the protocol.
1297 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0;
1299 td->td_ru.ru_msgsnd++;
1300 if (control != NULL)
1301 clen = control->m_len;
1303 SOCKBUF_LOCK(&so->so_snd);
1304 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1305 SOCKBUF_UNLOCK(&so->so_snd);
1310 error = so->so_error;
1312 SOCKBUF_UNLOCK(&so->so_snd);
1315 if ((so->so_state & SS_ISCONNECTED) == 0) {
1317 * `sendto' and `sendmsg' is allowed on a connection-based
1318 * socket if it supports implied connect. Return ENOTCONN if
1319 * not connected and no address is supplied.
1321 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1322 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1323 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1324 !(resid == 0 && clen != 0)) {
1325 SOCKBUF_UNLOCK(&so->so_snd);
1329 } else if (addr == NULL) {
1330 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1333 error = EDESTADDRREQ;
1334 SOCKBUF_UNLOCK(&so->so_snd);
1340 * Do we need MSG_OOB support in SOCK_DGRAM? Signs here may be a
1341 * problem and need fixing.
1343 space = sbspace(&so->so_snd);
1344 if (flags & MSG_OOB)
1347 SOCKBUF_UNLOCK(&so->so_snd);
1348 if (resid > space) {
1354 if (flags & MSG_EOR)
1355 top->m_flags |= M_EOR;
1358 * Copy the data from userland into a mbuf chain.
1359 * If no data is to be copied in, a single empty mbuf
1362 top = m_uiotombuf(uio, M_WAITOK, space, max_hdr,
1363 (M_PKTHDR | ((flags & MSG_EOR) ? M_EOR : 0)));
1365 error = EFAULT; /* only possible error */
1368 space -= resid - uio->uio_resid;
1369 resid = uio->uio_resid;
1371 KASSERT(resid == 0, ("sosend_dgram: resid != 0"));
1373 * XXXRW: Frobbing SO_DONTROUTE here is even worse without sblock
1378 so->so_options |= SO_DONTROUTE;
1382 * XXX all the SBS_CANTSENDMORE checks previously done could be out
1383 * of date. We could have received a reset packet in an interrupt or
1384 * maybe we slept while doing page faults in uiomove() etc. We could
1385 * probably recheck again inside the locking protection here, but
1386 * there are probably other places that this also happens. We must
1390 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1391 (flags & MSG_OOB) ? PRUS_OOB :
1393 * If the user set MSG_EOF, the protocol understands this flag and
1394 * nothing left to send then use PRU_SEND_EOF instead of PRU_SEND.
1396 ((flags & MSG_EOF) &&
1397 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1400 /* If there is more to send set PRUS_MORETOCOME */
1401 (flags & MSG_MORETOCOME) ||
1402 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1403 top, addr, control, td);
1406 so->so_options &= ~SO_DONTROUTE;
1415 if (control != NULL)
1421 * Send on a socket. If send must go all at once and message is larger than
1422 * send buffering, then hard error. Lock against other senders. If must go
1423 * all at once and not enough room now, then inform user that this would
1424 * block and do nothing. Otherwise, if nonblocking, send as much as
1425 * possible. The data to be sent is described by "uio" if nonzero, otherwise
1426 * by the mbuf chain "top" (which must be null if uio is not). Data provided
1427 * in mbuf chain must be small enough to send all at once.
1429 * Returns nonzero on error, timeout or signal; callers must check for short
1430 * counts if EINTR/ERESTART are returned. Data and control buffers are freed
1434 sosend_generic(struct socket *so, struct sockaddr *addr, struct uio *uio,
1435 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1439 int clen = 0, error, dontroute;
1440 int atomic = sosendallatonce(so) || top;
1443 resid = uio->uio_resid;
1445 resid = top->m_pkthdr.len;
1447 * In theory resid should be unsigned. However, space must be
1448 * signed, as it might be less than 0 if we over-committed, and we
1449 * must use a signed comparison of space and resid. On the other
1450 * hand, a negative resid causes us to loop sending 0-length
1451 * segments to the protocol.
1453 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
1454 * type sockets since that's an error.
1456 if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
1462 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
1463 (so->so_proto->pr_flags & PR_ATOMIC);
1465 td->td_ru.ru_msgsnd++;
1466 if (control != NULL)
1467 clen = control->m_len;
1469 error = sblock(&so->so_snd, SBLOCKWAIT(flags));
1475 SOCKBUF_LOCK(&so->so_snd);
1476 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1477 SOCKBUF_UNLOCK(&so->so_snd);
1482 error = so->so_error;
1484 SOCKBUF_UNLOCK(&so->so_snd);
1487 if ((so->so_state & SS_ISCONNECTED) == 0) {
1489 * `sendto' and `sendmsg' is allowed on a connection-
1490 * based socket if it supports implied connect.
1491 * Return ENOTCONN if not connected and no address is
1494 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1495 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1496 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1497 !(resid == 0 && clen != 0)) {
1498 SOCKBUF_UNLOCK(&so->so_snd);
1502 } else if (addr == NULL) {
1503 SOCKBUF_UNLOCK(&so->so_snd);
1504 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1507 error = EDESTADDRREQ;
1511 space = sbspace(&so->so_snd);
1512 if (flags & MSG_OOB)
1514 if ((atomic && resid > so->so_snd.sb_hiwat) ||
1515 clen > so->so_snd.sb_hiwat) {
1516 SOCKBUF_UNLOCK(&so->so_snd);
1520 if (space < resid + clen &&
1521 (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1522 if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1523 SOCKBUF_UNLOCK(&so->so_snd);
1524 error = EWOULDBLOCK;
1527 error = sbwait(&so->so_snd);
1528 SOCKBUF_UNLOCK(&so->so_snd);
1533 SOCKBUF_UNLOCK(&so->so_snd);
1538 if (flags & MSG_EOR)
1539 top->m_flags |= M_EOR;
1542 * Copy the data from userland into a mbuf
1543 * chain. If resid is 0, which can happen
1544 * only if we have control to send, then
1545 * a single empty mbuf is returned. This
1546 * is a workaround to prevent protocol send
1549 top = m_uiotombuf(uio, M_WAITOK, space,
1550 (atomic ? max_hdr : 0),
1551 (atomic ? M_PKTHDR : 0) |
1552 ((flags & MSG_EOR) ? M_EOR : 0));
1554 error = EFAULT; /* only possible error */
1557 space -= resid - uio->uio_resid;
1558 resid = uio->uio_resid;
1562 so->so_options |= SO_DONTROUTE;
1566 * XXX all the SBS_CANTSENDMORE checks previously
1567 * done could be out of date. We could have received
1568 * a reset packet in an interrupt or maybe we slept
1569 * while doing page faults in uiomove() etc. We
1570 * could probably recheck again inside the locking
1571 * protection here, but there are probably other
1572 * places that this also happens. We must rethink
1576 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1577 (flags & MSG_OOB) ? PRUS_OOB :
1579 * If the user set MSG_EOF, the protocol understands
1580 * this flag and nothing left to send then use
1581 * PRU_SEND_EOF instead of PRU_SEND.
1583 ((flags & MSG_EOF) &&
1584 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1587 /* If there is more to send set PRUS_MORETOCOME. */
1588 (flags & MSG_MORETOCOME) ||
1589 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1590 top, addr, control, td);
1593 so->so_options &= ~SO_DONTROUTE;
1601 } while (resid && space > 0);
1605 sbunlock(&so->so_snd);
1609 if (control != NULL)
1615 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
1616 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1620 CURVNET_SET(so->so_vnet);
1621 if (!SOLISTENING(so))
1622 error = so->so_proto->pr_usrreqs->pru_sosend(so, addr, uio,
1623 top, control, flags, td);
1634 * The part of soreceive() that implements reading non-inline out-of-band
1635 * data from a socket. For more complete comments, see soreceive(), from
1636 * which this code originated.
1638 * Note that soreceive_rcvoob(), unlike the remainder of soreceive(), is
1639 * unable to return an mbuf chain to the caller.
1642 soreceive_rcvoob(struct socket *so, struct uio *uio, int flags)
1644 struct protosw *pr = so->so_proto;
1648 KASSERT(flags & MSG_OOB, ("soreceive_rcvoob: (flags & MSG_OOB) == 0"));
1651 m = m_get(M_WAITOK, MT_DATA);
1652 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK);
1656 error = uiomove(mtod(m, void *),
1657 (int) min(uio->uio_resid, m->m_len), uio);
1659 } while (uio->uio_resid && error == 0 && m);
1667 * Following replacement or removal of the first mbuf on the first mbuf chain
1668 * of a socket buffer, push necessary state changes back into the socket
1669 * buffer so that other consumers see the values consistently. 'nextrecord'
1670 * is the callers locally stored value of the original value of
1671 * sb->sb_mb->m_nextpkt which must be restored when the lead mbuf changes.
1672 * NOTE: 'nextrecord' may be NULL.
1674 static __inline void
1675 sockbuf_pushsync(struct sockbuf *sb, struct mbuf *nextrecord)
1678 SOCKBUF_LOCK_ASSERT(sb);
1680 * First, update for the new value of nextrecord. If necessary, make
1681 * it the first record.
1683 if (sb->sb_mb != NULL)
1684 sb->sb_mb->m_nextpkt = nextrecord;
1686 sb->sb_mb = nextrecord;
1689 * Now update any dependent socket buffer fields to reflect the new
1690 * state. This is an expanded inline of SB_EMPTY_FIXUP(), with the
1691 * addition of a second clause that takes care of the case where
1692 * sb_mb has been updated, but remains the last record.
1694 if (sb->sb_mb == NULL) {
1695 sb->sb_mbtail = NULL;
1696 sb->sb_lastrecord = NULL;
1697 } else if (sb->sb_mb->m_nextpkt == NULL)
1698 sb->sb_lastrecord = sb->sb_mb;
1702 * Implement receive operations on a socket. We depend on the way that
1703 * records are added to the sockbuf by sbappend. In particular, each record
1704 * (mbufs linked through m_next) must begin with an address if the protocol
1705 * so specifies, followed by an optional mbuf or mbufs containing ancillary
1706 * data, and then zero or more mbufs of data. In order to allow parallelism
1707 * between network receive and copying to user space, as well as avoid
1708 * sleeping with a mutex held, we release the socket buffer mutex during the
1709 * user space copy. Although the sockbuf is locked, new data may still be
1710 * appended, and thus we must maintain consistency of the sockbuf during that
1713 * The caller may receive the data as a single mbuf chain by supplying an
1714 * mbuf **mp0 for use in returning the chain. The uio is then used only for
1715 * the count in uio_resid.
1718 soreceive_generic(struct socket *so, struct sockaddr **psa, struct uio *uio,
1719 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1721 struct mbuf *m, **mp;
1722 int flags, error, offset;
1724 struct protosw *pr = so->so_proto;
1725 struct mbuf *nextrecord;
1727 ssize_t orig_resid = uio->uio_resid;
1732 if (controlp != NULL)
1735 flags = *flagsp &~ MSG_EOR;
1738 if (flags & MSG_OOB)
1739 return (soreceive_rcvoob(so, uio, flags));
1742 if ((pr->pr_flags & PR_WANTRCVD) && (so->so_state & SS_ISCONFIRMING)
1743 && uio->uio_resid) {
1745 (*pr->pr_usrreqs->pru_rcvd)(so, 0);
1748 error = sblock(&so->so_rcv, SBLOCKWAIT(flags));
1753 SOCKBUF_LOCK(&so->so_rcv);
1754 m = so->so_rcv.sb_mb;
1756 * If we have less data than requested, block awaiting more (subject
1757 * to any timeout) if:
1758 * 1. the current count is less than the low water mark, or
1759 * 2. MSG_DONTWAIT is not set
1761 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
1762 sbavail(&so->so_rcv) < uio->uio_resid) &&
1763 sbavail(&so->so_rcv) < so->so_rcv.sb_lowat &&
1764 m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) {
1765 KASSERT(m != NULL || !sbavail(&so->so_rcv),
1766 ("receive: m == %p sbavail == %u",
1767 m, sbavail(&so->so_rcv)));
1771 error = so->so_error;
1772 if ((flags & MSG_PEEK) == 0)
1774 SOCKBUF_UNLOCK(&so->so_rcv);
1777 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1778 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
1780 SOCKBUF_UNLOCK(&so->so_rcv);
1785 for (; m != NULL; m = m->m_next)
1786 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1787 m = so->so_rcv.sb_mb;
1790 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1791 (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1792 SOCKBUF_UNLOCK(&so->so_rcv);
1796 if (uio->uio_resid == 0) {
1797 SOCKBUF_UNLOCK(&so->so_rcv);
1800 if ((so->so_state & SS_NBIO) ||
1801 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1802 SOCKBUF_UNLOCK(&so->so_rcv);
1803 error = EWOULDBLOCK;
1806 SBLASTRECORDCHK(&so->so_rcv);
1807 SBLASTMBUFCHK(&so->so_rcv);
1808 error = sbwait(&so->so_rcv);
1809 SOCKBUF_UNLOCK(&so->so_rcv);
1816 * From this point onward, we maintain 'nextrecord' as a cache of the
1817 * pointer to the next record in the socket buffer. We must keep the
1818 * various socket buffer pointers and local stack versions of the
1819 * pointers in sync, pushing out modifications before dropping the
1820 * socket buffer mutex, and re-reading them when picking it up.
1822 * Otherwise, we will race with the network stack appending new data
1823 * or records onto the socket buffer by using inconsistent/stale
1824 * versions of the field, possibly resulting in socket buffer
1827 * By holding the high-level sblock(), we prevent simultaneous
1828 * readers from pulling off the front of the socket buffer.
1830 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1832 uio->uio_td->td_ru.ru_msgrcv++;
1833 KASSERT(m == so->so_rcv.sb_mb, ("soreceive: m != so->so_rcv.sb_mb"));
1834 SBLASTRECORDCHK(&so->so_rcv);
1835 SBLASTMBUFCHK(&so->so_rcv);
1836 nextrecord = m->m_nextpkt;
1837 if (pr->pr_flags & PR_ADDR) {
1838 KASSERT(m->m_type == MT_SONAME,
1839 ("m->m_type == %d", m->m_type));
1842 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
1844 if (flags & MSG_PEEK) {
1847 sbfree(&so->so_rcv, m);
1848 so->so_rcv.sb_mb = m_free(m);
1849 m = so->so_rcv.sb_mb;
1850 sockbuf_pushsync(&so->so_rcv, nextrecord);
1855 * Process one or more MT_CONTROL mbufs present before any data mbufs
1856 * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1857 * just copy the data; if !MSG_PEEK, we call into the protocol to
1858 * perform externalization (or freeing if controlp == NULL).
1860 if (m != NULL && m->m_type == MT_CONTROL) {
1861 struct mbuf *cm = NULL, *cmn;
1862 struct mbuf **cme = &cm;
1865 if (flags & MSG_PEEK) {
1866 if (controlp != NULL) {
1867 *controlp = m_copym(m, 0, m->m_len,
1869 controlp = &(*controlp)->m_next;
1873 sbfree(&so->so_rcv, m);
1874 so->so_rcv.sb_mb = m->m_next;
1877 cme = &(*cme)->m_next;
1878 m = so->so_rcv.sb_mb;
1880 } while (m != NULL && m->m_type == MT_CONTROL);
1881 if ((flags & MSG_PEEK) == 0)
1882 sockbuf_pushsync(&so->so_rcv, nextrecord);
1883 while (cm != NULL) {
1886 if (pr->pr_domain->dom_externalize != NULL) {
1887 SOCKBUF_UNLOCK(&so->so_rcv);
1889 error = (*pr->pr_domain->dom_externalize)
1890 (cm, controlp, flags);
1891 SOCKBUF_LOCK(&so->so_rcv);
1892 } else if (controlp != NULL)
1896 if (controlp != NULL) {
1898 while (*controlp != NULL)
1899 controlp = &(*controlp)->m_next;
1904 nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1906 nextrecord = so->so_rcv.sb_mb;
1910 if ((flags & MSG_PEEK) == 0) {
1911 KASSERT(m->m_nextpkt == nextrecord,
1912 ("soreceive: post-control, nextrecord !sync"));
1913 if (nextrecord == NULL) {
1914 KASSERT(so->so_rcv.sb_mb == m,
1915 ("soreceive: post-control, sb_mb!=m"));
1916 KASSERT(so->so_rcv.sb_lastrecord == m,
1917 ("soreceive: post-control, lastrecord!=m"));
1921 if (type == MT_OOBDATA)
1924 if ((flags & MSG_PEEK) == 0) {
1925 KASSERT(so->so_rcv.sb_mb == nextrecord,
1926 ("soreceive: sb_mb != nextrecord"));
1927 if (so->so_rcv.sb_mb == NULL) {
1928 KASSERT(so->so_rcv.sb_lastrecord == NULL,
1929 ("soreceive: sb_lastercord != NULL"));
1933 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1934 SBLASTRECORDCHK(&so->so_rcv);
1935 SBLASTMBUFCHK(&so->so_rcv);
1938 * Now continue to read any data mbufs off of the head of the socket
1939 * buffer until the read request is satisfied. Note that 'type' is
1940 * used to store the type of any mbuf reads that have happened so far
1941 * such that soreceive() can stop reading if the type changes, which
1942 * causes soreceive() to return only one of regular data and inline
1943 * out-of-band data in a single socket receive operation.
1947 while (m != NULL && !(m->m_flags & M_NOTAVAIL) && uio->uio_resid > 0
1950 * If the type of mbuf has changed since the last mbuf
1951 * examined ('type'), end the receive operation.
1953 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1954 if (m->m_type == MT_OOBDATA || m->m_type == MT_CONTROL) {
1955 if (type != m->m_type)
1957 } else if (type == MT_OOBDATA)
1960 KASSERT(m->m_type == MT_DATA,
1961 ("m->m_type == %d", m->m_type));
1962 so->so_rcv.sb_state &= ~SBS_RCVATMARK;
1963 len = uio->uio_resid;
1964 if (so->so_oobmark && len > so->so_oobmark - offset)
1965 len = so->so_oobmark - offset;
1966 if (len > m->m_len - moff)
1967 len = m->m_len - moff;
1969 * If mp is set, just pass back the mbufs. Otherwise copy
1970 * them out via the uio, then free. Sockbuf must be
1971 * consistent here (points to current mbuf, it points to next
1972 * record) when we drop priority; we must note any additions
1973 * to the sockbuf when we block interrupts again.
1976 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1977 SBLASTRECORDCHK(&so->so_rcv);
1978 SBLASTMBUFCHK(&so->so_rcv);
1979 SOCKBUF_UNLOCK(&so->so_rcv);
1980 error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1981 SOCKBUF_LOCK(&so->so_rcv);
1984 * The MT_SONAME mbuf has already been removed
1985 * from the record, so it is necessary to
1986 * remove the data mbufs, if any, to preserve
1987 * the invariant in the case of PR_ADDR that
1988 * requires MT_SONAME mbufs at the head of
1991 if (pr->pr_flags & PR_ATOMIC &&
1992 ((flags & MSG_PEEK) == 0))
1993 (void)sbdroprecord_locked(&so->so_rcv);
1994 SOCKBUF_UNLOCK(&so->so_rcv);
1998 uio->uio_resid -= len;
1999 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2000 if (len == m->m_len - moff) {
2001 if (m->m_flags & M_EOR)
2003 if (flags & MSG_PEEK) {
2007 nextrecord = m->m_nextpkt;
2008 sbfree(&so->so_rcv, m);
2010 m->m_nextpkt = NULL;
2013 so->so_rcv.sb_mb = m = m->m_next;
2016 so->so_rcv.sb_mb = m_free(m);
2017 m = so->so_rcv.sb_mb;
2019 sockbuf_pushsync(&so->so_rcv, nextrecord);
2020 SBLASTRECORDCHK(&so->so_rcv);
2021 SBLASTMBUFCHK(&so->so_rcv);
2024 if (flags & MSG_PEEK)
2028 if (flags & MSG_DONTWAIT) {
2029 *mp = m_copym(m, 0, len,
2033 * m_copym() couldn't
2035 * Adjust uio_resid back
2037 * down by len bytes,
2038 * which we didn't end
2039 * up "copying" over).
2041 uio->uio_resid += len;
2045 SOCKBUF_UNLOCK(&so->so_rcv);
2046 *mp = m_copym(m, 0, len,
2048 SOCKBUF_LOCK(&so->so_rcv);
2051 sbcut_locked(&so->so_rcv, len);
2054 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2055 if (so->so_oobmark) {
2056 if ((flags & MSG_PEEK) == 0) {
2057 so->so_oobmark -= len;
2058 if (so->so_oobmark == 0) {
2059 so->so_rcv.sb_state |= SBS_RCVATMARK;
2064 if (offset == so->so_oobmark)
2068 if (flags & MSG_EOR)
2071 * If the MSG_WAITALL flag is set (for non-atomic socket), we
2072 * must not quit until "uio->uio_resid == 0" or an error
2073 * termination. If a signal/timeout occurs, return with a
2074 * short count but without error. Keep sockbuf locked
2075 * against other readers.
2077 while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
2078 !sosendallatonce(so) && nextrecord == NULL) {
2079 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2081 so->so_rcv.sb_state & SBS_CANTRCVMORE)
2084 * Notify the protocol that some data has been
2085 * drained before blocking.
2087 if (pr->pr_flags & PR_WANTRCVD) {
2088 SOCKBUF_UNLOCK(&so->so_rcv);
2090 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
2091 SOCKBUF_LOCK(&so->so_rcv);
2093 SBLASTRECORDCHK(&so->so_rcv);
2094 SBLASTMBUFCHK(&so->so_rcv);
2096 * We could receive some data while was notifying
2097 * the protocol. Skip blocking in this case.
2099 if (so->so_rcv.sb_mb == NULL) {
2100 error = sbwait(&so->so_rcv);
2102 SOCKBUF_UNLOCK(&so->so_rcv);
2106 m = so->so_rcv.sb_mb;
2108 nextrecord = m->m_nextpkt;
2112 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2113 if (m != NULL && pr->pr_flags & PR_ATOMIC) {
2115 if ((flags & MSG_PEEK) == 0)
2116 (void) sbdroprecord_locked(&so->so_rcv);
2118 if ((flags & MSG_PEEK) == 0) {
2121 * First part is an inline SB_EMPTY_FIXUP(). Second
2122 * part makes sure sb_lastrecord is up-to-date if
2123 * there is still data in the socket buffer.
2125 so->so_rcv.sb_mb = nextrecord;
2126 if (so->so_rcv.sb_mb == NULL) {
2127 so->so_rcv.sb_mbtail = NULL;
2128 so->so_rcv.sb_lastrecord = NULL;
2129 } else if (nextrecord->m_nextpkt == NULL)
2130 so->so_rcv.sb_lastrecord = nextrecord;
2132 SBLASTRECORDCHK(&so->so_rcv);
2133 SBLASTMBUFCHK(&so->so_rcv);
2135 * If soreceive() is being done from the socket callback,
2136 * then don't need to generate ACK to peer to update window,
2137 * since ACK will be generated on return to TCP.
2139 if (!(flags & MSG_SOCALLBCK) &&
2140 (pr->pr_flags & PR_WANTRCVD)) {
2141 SOCKBUF_UNLOCK(&so->so_rcv);
2143 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
2144 SOCKBUF_LOCK(&so->so_rcv);
2147 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2148 if (orig_resid == uio->uio_resid && orig_resid &&
2149 (flags & MSG_EOR) == 0 && (so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0) {
2150 SOCKBUF_UNLOCK(&so->so_rcv);
2153 SOCKBUF_UNLOCK(&so->so_rcv);
2158 sbunlock(&so->so_rcv);
2163 * Optimized version of soreceive() for stream (TCP) sockets.
2164 * XXXAO: (MSG_WAITALL | MSG_PEEK) isn't properly handled.
2167 soreceive_stream(struct socket *so, struct sockaddr **psa, struct uio *uio,
2168 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2170 int len = 0, error = 0, flags, oresid;
2172 struct mbuf *m, *n = NULL;
2174 /* We only do stream sockets. */
2175 if (so->so_type != SOCK_STREAM)
2179 if (controlp != NULL)
2182 flags = *flagsp &~ MSG_EOR;
2185 if (flags & MSG_OOB)
2186 return (soreceive_rcvoob(so, uio, flags));
2192 /* Prevent other readers from entering the socket. */
2193 error = sblock(sb, SBLOCKWAIT(flags));
2198 /* Easy one, no space to copyout anything. */
2199 if (uio->uio_resid == 0) {
2203 oresid = uio->uio_resid;
2205 /* We will never ever get anything unless we are or were connected. */
2206 if (!(so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED))) {
2212 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2214 /* Abort if socket has reported problems. */
2216 if (sbavail(sb) > 0)
2218 if (oresid > uio->uio_resid)
2220 error = so->so_error;
2221 if (!(flags & MSG_PEEK))
2226 /* Door is closed. Deliver what is left, if any. */
2227 if (sb->sb_state & SBS_CANTRCVMORE) {
2228 if (sbavail(sb) > 0)
2234 /* Socket buffer is empty and we shall not block. */
2235 if (sbavail(sb) == 0 &&
2236 ((so->so_state & SS_NBIO) || (flags & (MSG_DONTWAIT|MSG_NBIO)))) {
2241 /* Socket buffer got some data that we shall deliver now. */
2242 if (sbavail(sb) > 0 && !(flags & MSG_WAITALL) &&
2243 ((so->so_state & SS_NBIO) ||
2244 (flags & (MSG_DONTWAIT|MSG_NBIO)) ||
2245 sbavail(sb) >= sb->sb_lowat ||
2246 sbavail(sb) >= uio->uio_resid ||
2247 sbavail(sb) >= sb->sb_hiwat) ) {
2251 /* On MSG_WAITALL we must wait until all data or error arrives. */
2252 if ((flags & MSG_WAITALL) &&
2253 (sbavail(sb) >= uio->uio_resid || sbavail(sb) >= sb->sb_hiwat))
2257 * Wait and block until (more) data comes in.
2258 * NB: Drops the sockbuf lock during wait.
2266 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2267 KASSERT(sbavail(sb) > 0, ("%s: sockbuf empty", __func__));
2268 KASSERT(sb->sb_mb != NULL, ("%s: sb_mb == NULL", __func__));
2272 uio->uio_td->td_ru.ru_msgrcv++;
2274 /* Fill uio until full or current end of socket buffer is reached. */
2275 len = min(uio->uio_resid, sbavail(sb));
2277 /* Dequeue as many mbufs as possible. */
2278 if (!(flags & MSG_PEEK) && len >= sb->sb_mb->m_len) {
2282 m_cat(*mp0, sb->sb_mb);
2284 m != NULL && m->m_len <= len;
2286 KASSERT(!(m->m_flags & M_NOTAVAIL),
2287 ("%s: m %p not available", __func__, m));
2289 uio->uio_resid -= m->m_len;
2295 sb->sb_lastrecord = sb->sb_mb;
2296 if (sb->sb_mb == NULL)
2299 /* Copy the remainder. */
2301 KASSERT(sb->sb_mb != NULL,
2302 ("%s: len > 0 && sb->sb_mb empty", __func__));
2304 m = m_copym(sb->sb_mb, 0, len, M_NOWAIT);
2306 len = 0; /* Don't flush data from sockbuf. */
2308 uio->uio_resid -= len;
2319 /* NB: Must unlock socket buffer as uiomove may sleep. */
2321 error = m_mbuftouio(uio, sb->sb_mb, len);
2326 SBLASTRECORDCHK(sb);
2330 * Remove the delivered data from the socket buffer unless we
2331 * were only peeking.
2333 if (!(flags & MSG_PEEK)) {
2335 sbdrop_locked(sb, len);
2337 /* Notify protocol that we drained some data. */
2338 if ((so->so_proto->pr_flags & PR_WANTRCVD) &&
2339 (((flags & MSG_WAITALL) && uio->uio_resid > 0) ||
2340 !(flags & MSG_SOCALLBCK))) {
2343 (*so->so_proto->pr_usrreqs->pru_rcvd)(so, flags);
2349 * For MSG_WAITALL we may have to loop again and wait for
2350 * more data to come in.
2352 if ((flags & MSG_WAITALL) && uio->uio_resid > 0)
2355 SOCKBUF_LOCK_ASSERT(sb);
2356 SBLASTRECORDCHK(sb);
2364 * Optimized version of soreceive() for simple datagram cases from userspace.
2365 * Unlike in the stream case, we're able to drop a datagram if copyout()
2366 * fails, and because we handle datagrams atomically, we don't need to use a
2367 * sleep lock to prevent I/O interlacing.
2370 soreceive_dgram(struct socket *so, struct sockaddr **psa, struct uio *uio,
2371 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2373 struct mbuf *m, *m2;
2376 struct protosw *pr = so->so_proto;
2377 struct mbuf *nextrecord;
2381 if (controlp != NULL)
2384 flags = *flagsp &~ MSG_EOR;
2389 * For any complicated cases, fall back to the full
2390 * soreceive_generic().
2392 if (mp0 != NULL || (flags & MSG_PEEK) || (flags & MSG_OOB))
2393 return (soreceive_generic(so, psa, uio, mp0, controlp,
2397 * Enforce restrictions on use.
2399 KASSERT((pr->pr_flags & PR_WANTRCVD) == 0,
2400 ("soreceive_dgram: wantrcvd"));
2401 KASSERT(pr->pr_flags & PR_ATOMIC, ("soreceive_dgram: !atomic"));
2402 KASSERT((so->so_rcv.sb_state & SBS_RCVATMARK) == 0,
2403 ("soreceive_dgram: SBS_RCVATMARK"));
2404 KASSERT((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0,
2405 ("soreceive_dgram: P_CONNREQUIRED"));
2408 * Loop blocking while waiting for a datagram.
2410 SOCKBUF_LOCK(&so->so_rcv);
2411 while ((m = so->so_rcv.sb_mb) == NULL) {
2412 KASSERT(sbavail(&so->so_rcv) == 0,
2413 ("soreceive_dgram: sb_mb NULL but sbavail %u",
2414 sbavail(&so->so_rcv)));
2416 error = so->so_error;
2418 SOCKBUF_UNLOCK(&so->so_rcv);
2421 if (so->so_rcv.sb_state & SBS_CANTRCVMORE ||
2422 uio->uio_resid == 0) {
2423 SOCKBUF_UNLOCK(&so->so_rcv);
2426 if ((so->so_state & SS_NBIO) ||
2427 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
2428 SOCKBUF_UNLOCK(&so->so_rcv);
2429 return (EWOULDBLOCK);
2431 SBLASTRECORDCHK(&so->so_rcv);
2432 SBLASTMBUFCHK(&so->so_rcv);
2433 error = sbwait(&so->so_rcv);
2435 SOCKBUF_UNLOCK(&so->so_rcv);
2439 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2442 uio->uio_td->td_ru.ru_msgrcv++;
2443 SBLASTRECORDCHK(&so->so_rcv);
2444 SBLASTMBUFCHK(&so->so_rcv);
2445 nextrecord = m->m_nextpkt;
2446 if (nextrecord == NULL) {
2447 KASSERT(so->so_rcv.sb_lastrecord == m,
2448 ("soreceive_dgram: lastrecord != m"));
2451 KASSERT(so->so_rcv.sb_mb->m_nextpkt == nextrecord,
2452 ("soreceive_dgram: m_nextpkt != nextrecord"));
2455 * Pull 'm' and its chain off the front of the packet queue.
2457 so->so_rcv.sb_mb = NULL;
2458 sockbuf_pushsync(&so->so_rcv, nextrecord);
2461 * Walk 'm's chain and free that many bytes from the socket buffer.
2463 for (m2 = m; m2 != NULL; m2 = m2->m_next)
2464 sbfree(&so->so_rcv, m2);
2467 * Do a few last checks before we let go of the lock.
2469 SBLASTRECORDCHK(&so->so_rcv);
2470 SBLASTMBUFCHK(&so->so_rcv);
2471 SOCKBUF_UNLOCK(&so->so_rcv);
2473 if (pr->pr_flags & PR_ADDR) {
2474 KASSERT(m->m_type == MT_SONAME,
2475 ("m->m_type == %d", m->m_type));
2477 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
2482 /* XXXRW: Can this happen? */
2487 * Packet to copyout() is now in 'm' and it is disconnected from the
2490 * Process one or more MT_CONTROL mbufs present before any data mbufs
2491 * in the first mbuf chain on the socket buffer. We call into the
2492 * protocol to perform externalization (or freeing if controlp ==
2493 * NULL). In some cases there can be only MT_CONTROL mbufs without
2496 if (m->m_type == MT_CONTROL) {
2497 struct mbuf *cm = NULL, *cmn;
2498 struct mbuf **cme = &cm;
2504 cme = &(*cme)->m_next;
2506 } while (m != NULL && m->m_type == MT_CONTROL);
2507 while (cm != NULL) {
2510 if (pr->pr_domain->dom_externalize != NULL) {
2511 error = (*pr->pr_domain->dom_externalize)
2512 (cm, controlp, flags);
2513 } else if (controlp != NULL)
2517 if (controlp != NULL) {
2518 while (*controlp != NULL)
2519 controlp = &(*controlp)->m_next;
2524 KASSERT(m == NULL || m->m_type == MT_DATA,
2525 ("soreceive_dgram: !data"));
2526 while (m != NULL && uio->uio_resid > 0) {
2527 len = uio->uio_resid;
2530 error = uiomove(mtod(m, char *), (int)len, uio);
2535 if (len == m->m_len)
2552 soreceive(struct socket *so, struct sockaddr **psa, struct uio *uio,
2553 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2557 CURVNET_SET(so->so_vnet);
2558 if (!SOLISTENING(so))
2559 error = (so->so_proto->pr_usrreqs->pru_soreceive(so, psa, uio,
2560 mp0, controlp, flagsp));
2568 soshutdown(struct socket *so, int how)
2570 struct protosw *pr = so->so_proto;
2571 int error, soerror_enotconn;
2573 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
2576 soerror_enotconn = 0;
2578 (SS_ISCONNECTED | SS_ISCONNECTING | SS_ISDISCONNECTING)) == 0) {
2580 * POSIX mandates us to return ENOTCONN when shutdown(2) is
2581 * invoked on a datagram sockets, however historically we would
2582 * actually tear socket down. This is known to be leveraged by
2583 * some applications to unblock process waiting in recvXXX(2)
2584 * by other process that it shares that socket with. Try to meet
2585 * both backward-compatibility and POSIX requirements by forcing
2586 * ENOTCONN but still asking protocol to perform pru_shutdown().
2588 if (so->so_type != SOCK_DGRAM)
2590 soerror_enotconn = 1;
2593 CURVNET_SET(so->so_vnet);
2594 if (pr->pr_usrreqs->pru_flush != NULL)
2595 (*pr->pr_usrreqs->pru_flush)(so, how);
2598 if (how != SHUT_RD) {
2599 error = (*pr->pr_usrreqs->pru_shutdown)(so);
2600 wakeup(&so->so_timeo);
2602 return ((error == 0 && soerror_enotconn) ? ENOTCONN : error);
2604 wakeup(&so->so_timeo);
2607 return (soerror_enotconn ? ENOTCONN : 0);
2611 sorflush(struct socket *so)
2613 struct sockbuf *sb = &so->so_rcv;
2614 struct protosw *pr = so->so_proto;
2620 * In order to avoid calling dom_dispose with the socket buffer mutex
2621 * held, and in order to generally avoid holding the lock for a long
2622 * time, we make a copy of the socket buffer and clear the original
2623 * (except locks, state). The new socket buffer copy won't have
2624 * initialized locks so we can only call routines that won't use or
2625 * assert those locks.
2627 * Dislodge threads currently blocked in receive and wait to acquire
2628 * a lock against other simultaneous readers before clearing the
2629 * socket buffer. Don't let our acquire be interrupted by a signal
2630 * despite any existing socket disposition on interruptable waiting.
2633 (void) sblock(sb, SBL_WAIT | SBL_NOINTR);
2636 * Invalidate/clear most of the sockbuf structure, but leave selinfo
2637 * and mutex data unchanged.
2640 bzero(&aso, sizeof(aso));
2641 aso.so_pcb = so->so_pcb;
2642 bcopy(&sb->sb_startzero, &aso.so_rcv.sb_startzero,
2643 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
2644 bzero(&sb->sb_startzero,
2645 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
2650 * Dispose of special rights and flush the copied socket. Don't call
2651 * any unsafe routines (that rely on locks being initialized) on aso.
2653 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
2654 (*pr->pr_domain->dom_dispose)(&aso);
2655 sbrelease_internal(&aso.so_rcv, so);
2659 * Wrapper for Socket established helper hook.
2660 * Parameters: socket, context of the hook point, hook id.
2663 hhook_run_socket(struct socket *so, void *hctx, int32_t h_id)
2665 struct socket_hhook_data hhook_data = {
2672 CURVNET_SET(so->so_vnet);
2673 HHOOKS_RUN_IF(V_socket_hhh[h_id], &hhook_data, &so->osd);
2676 /* Ugly but needed, since hhooks return void for now */
2677 return (hhook_data.status);
2681 * Perhaps this routine, and sooptcopyout(), below, ought to come in an
2682 * additional variant to handle the case where the option value needs to be
2683 * some kind of integer, but not a specific size. In addition to their use
2684 * here, these functions are also called by the protocol-level pr_ctloutput()
2688 sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
2693 * If the user gives us more than we wanted, we ignore it, but if we
2694 * don't get the minimum length the caller wants, we return EINVAL.
2695 * On success, sopt->sopt_valsize is set to however much we actually
2698 if ((valsize = sopt->sopt_valsize) < minlen)
2701 sopt->sopt_valsize = valsize = len;
2703 if (sopt->sopt_td != NULL)
2704 return (copyin(sopt->sopt_val, buf, valsize));
2706 bcopy(sopt->sopt_val, buf, valsize);
2711 * Kernel version of setsockopt(2).
2713 * XXX: optlen is size_t, not socklen_t
2716 so_setsockopt(struct socket *so, int level, int optname, void *optval,
2719 struct sockopt sopt;
2721 sopt.sopt_level = level;
2722 sopt.sopt_name = optname;
2723 sopt.sopt_dir = SOPT_SET;
2724 sopt.sopt_val = optval;
2725 sopt.sopt_valsize = optlen;
2726 sopt.sopt_td = NULL;
2727 return (sosetopt(so, &sopt));
2731 sosetopt(struct socket *so, struct sockopt *sopt)
2742 CURVNET_SET(so->so_vnet);
2744 if (sopt->sopt_level != SOL_SOCKET) {
2745 if (so->so_proto->pr_ctloutput != NULL) {
2746 error = (*so->so_proto->pr_ctloutput)(so, sopt);
2750 error = ENOPROTOOPT;
2752 switch (sopt->sopt_name) {
2753 case SO_ACCEPTFILTER:
2754 error = accept_filt_setopt(so, sopt);
2760 error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
2765 so->so_linger = l.l_linger;
2767 so->so_options |= SO_LINGER;
2769 so->so_options &= ~SO_LINGER;
2776 case SO_USELOOPBACK:
2786 error = sooptcopyin(sopt, &optval, sizeof optval,
2792 so->so_options |= sopt->sopt_name;
2794 so->so_options &= ~sopt->sopt_name;
2799 error = sooptcopyin(sopt, &optval, sizeof optval,
2804 if (optval < 0 || optval >= rt_numfibs) {
2808 if (((so->so_proto->pr_domain->dom_family == PF_INET) ||
2809 (so->so_proto->pr_domain->dom_family == PF_INET6) ||
2810 (so->so_proto->pr_domain->dom_family == PF_ROUTE)))
2811 so->so_fibnum = optval;
2816 case SO_USER_COOKIE:
2817 error = sooptcopyin(sopt, &val32, sizeof val32,
2821 so->so_user_cookie = val32;
2828 error = sooptcopyin(sopt, &optval, sizeof optval,
2834 * Values < 1 make no sense for any of these options,
2842 error = sbsetopt(so, sopt->sopt_name, optval);
2847 #ifdef COMPAT_FREEBSD32
2848 if (SV_CURPROC_FLAG(SV_ILP32)) {
2849 struct timeval32 tv32;
2851 error = sooptcopyin(sopt, &tv32, sizeof tv32,
2853 CP(tv32, tv, tv_sec);
2854 CP(tv32, tv, tv_usec);
2857 error = sooptcopyin(sopt, &tv, sizeof tv,
2861 if (tv.tv_sec < 0 || tv.tv_usec < 0 ||
2862 tv.tv_usec >= 1000000) {
2866 if (tv.tv_sec > INT32_MAX)
2870 switch (sopt->sopt_name) {
2872 so->so_snd.sb_timeo = val;
2875 so->so_rcv.sb_timeo = val;
2882 error = sooptcopyin(sopt, &extmac, sizeof extmac,
2886 error = mac_setsockopt_label(sopt->sopt_td->td_ucred,
2894 error = sooptcopyin(sopt, &optval, sizeof optval,
2898 if (optval < 0 || optval > SO_TS_CLOCK_MAX) {
2902 so->so_ts_clock = optval;
2905 case SO_MAX_PACING_RATE:
2906 error = sooptcopyin(sopt, &val32, sizeof(val32),
2910 so->so_max_pacing_rate = val32;
2914 if (V_socket_hhh[HHOOK_SOCKET_OPT]->hhh_nhooks > 0)
2915 error = hhook_run_socket(so, sopt,
2918 error = ENOPROTOOPT;
2921 if (error == 0 && so->so_proto->pr_ctloutput != NULL)
2922 (void)(*so->so_proto->pr_ctloutput)(so, sopt);
2930 * Helper routine for getsockopt.
2933 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
2941 * Documented get behavior is that we always return a value, possibly
2942 * truncated to fit in the user's buffer. Traditional behavior is
2943 * that we always tell the user precisely how much we copied, rather
2944 * than something useful like the total amount we had available for
2945 * her. Note that this interface is not idempotent; the entire
2946 * answer must be generated ahead of time.
2948 valsize = min(len, sopt->sopt_valsize);
2949 sopt->sopt_valsize = valsize;
2950 if (sopt->sopt_val != NULL) {
2951 if (sopt->sopt_td != NULL)
2952 error = copyout(buf, sopt->sopt_val, valsize);
2954 bcopy(buf, sopt->sopt_val, valsize);
2960 sogetopt(struct socket *so, struct sockopt *sopt)
2969 CURVNET_SET(so->so_vnet);
2971 if (sopt->sopt_level != SOL_SOCKET) {
2972 if (so->so_proto->pr_ctloutput != NULL)
2973 error = (*so->so_proto->pr_ctloutput)(so, sopt);
2975 error = ENOPROTOOPT;
2979 switch (sopt->sopt_name) {
2980 case SO_ACCEPTFILTER:
2981 error = accept_filt_getopt(so, sopt);
2986 l.l_onoff = so->so_options & SO_LINGER;
2987 l.l_linger = so->so_linger;
2989 error = sooptcopyout(sopt, &l, sizeof l);
2992 case SO_USELOOPBACK:
3004 optval = so->so_options & sopt->sopt_name;
3006 error = sooptcopyout(sopt, &optval, sizeof optval);
3010 optval = so->so_type;
3014 optval = so->so_proto->pr_protocol;
3019 optval = so->so_error;
3025 optval = SOLISTENING(so) ? so->sol_sbsnd_hiwat :
3026 so->so_snd.sb_hiwat;
3030 optval = SOLISTENING(so) ? so->sol_sbrcv_hiwat :
3031 so->so_rcv.sb_hiwat;
3035 optval = SOLISTENING(so) ? so->sol_sbsnd_lowat :
3036 so->so_snd.sb_lowat;
3040 optval = SOLISTENING(so) ? so->sol_sbrcv_lowat :
3041 so->so_rcv.sb_lowat;
3046 tv = sbttotv(sopt->sopt_name == SO_SNDTIMEO ?
3047 so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
3048 #ifdef COMPAT_FREEBSD32
3049 if (SV_CURPROC_FLAG(SV_ILP32)) {
3050 struct timeval32 tv32;
3052 CP(tv, tv32, tv_sec);
3053 CP(tv, tv32, tv_usec);
3054 error = sooptcopyout(sopt, &tv32, sizeof tv32);
3057 error = sooptcopyout(sopt, &tv, sizeof tv);
3062 error = sooptcopyin(sopt, &extmac, sizeof(extmac),
3066 error = mac_getsockopt_label(sopt->sopt_td->td_ucred,
3070 error = sooptcopyout(sopt, &extmac, sizeof extmac);
3078 error = sooptcopyin(sopt, &extmac, sizeof(extmac),
3082 error = mac_getsockopt_peerlabel(
3083 sopt->sopt_td->td_ucred, so, &extmac);
3086 error = sooptcopyout(sopt, &extmac, sizeof extmac);
3092 case SO_LISTENQLIMIT:
3093 optval = SOLISTENING(so) ? so->sol_qlimit : 0;
3097 optval = SOLISTENING(so) ? so->sol_qlen : 0;
3100 case SO_LISTENINCQLEN:
3101 optval = SOLISTENING(so) ? so->sol_incqlen : 0;
3105 optval = so->so_ts_clock;
3108 case SO_MAX_PACING_RATE:
3109 optval = so->so_max_pacing_rate;
3113 if (V_socket_hhh[HHOOK_SOCKET_OPT]->hhh_nhooks > 0)
3114 error = hhook_run_socket(so, sopt,
3117 error = ENOPROTOOPT;
3129 soopt_getm(struct sockopt *sopt, struct mbuf **mp)
3131 struct mbuf *m, *m_prev;
3132 int sopt_size = sopt->sopt_valsize;
3134 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
3137 if (sopt_size > MLEN) {
3138 MCLGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT);
3139 if ((m->m_flags & M_EXT) == 0) {
3143 m->m_len = min(MCLBYTES, sopt_size);
3145 m->m_len = min(MLEN, sopt_size);
3147 sopt_size -= m->m_len;
3152 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
3157 if (sopt_size > MLEN) {
3158 MCLGET(m, sopt->sopt_td != NULL ? M_WAITOK :
3160 if ((m->m_flags & M_EXT) == 0) {
3165 m->m_len = min(MCLBYTES, sopt_size);
3167 m->m_len = min(MLEN, sopt_size);
3169 sopt_size -= m->m_len;
3177 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
3179 struct mbuf *m0 = m;
3181 if (sopt->sopt_val == NULL)
3183 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
3184 if (sopt->sopt_td != NULL) {
3187 error = copyin(sopt->sopt_val, mtod(m, char *),
3194 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len);
3195 sopt->sopt_valsize -= m->m_len;
3196 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
3199 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
3200 panic("ip6_sooptmcopyin");
3205 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
3207 struct mbuf *m0 = m;
3210 if (sopt->sopt_val == NULL)
3212 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
3213 if (sopt->sopt_td != NULL) {
3216 error = copyout(mtod(m, char *), sopt->sopt_val,
3223 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len);
3224 sopt->sopt_valsize -= m->m_len;
3225 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
3226 valsize += m->m_len;
3230 /* enough soopt buffer should be given from user-land */
3234 sopt->sopt_valsize = valsize;
3239 * sohasoutofband(): protocol notifies socket layer of the arrival of new
3240 * out-of-band data, which will then notify socket consumers.
3243 sohasoutofband(struct socket *so)
3246 if (so->so_sigio != NULL)
3247 pgsigio(&so->so_sigio, SIGURG, 0);
3248 selwakeuppri(&so->so_rdsel, PSOCK);
3252 sopoll(struct socket *so, int events, struct ucred *active_cred,
3257 * We do not need to set or assert curvnet as long as everyone uses
3260 return (so->so_proto->pr_usrreqs->pru_sopoll(so, events, active_cred,
3265 sopoll_generic(struct socket *so, int events, struct ucred *active_cred,
3271 if (SOLISTENING(so)) {
3272 if (!(events & (POLLIN | POLLRDNORM)))
3274 else if (!TAILQ_EMPTY(&so->sol_comp))
3275 revents = events & (POLLIN | POLLRDNORM);
3277 selrecord(td, &so->so_rdsel);
3282 SOCKBUF_LOCK(&so->so_snd);
3283 SOCKBUF_LOCK(&so->so_rcv);
3284 if (events & (POLLIN | POLLRDNORM))
3285 if (soreadabledata(so))
3286 revents |= events & (POLLIN | POLLRDNORM);
3287 if (events & (POLLOUT | POLLWRNORM))
3288 if (sowriteable(so))
3289 revents |= events & (POLLOUT | POLLWRNORM);
3290 if (events & (POLLPRI | POLLRDBAND))
3291 if (so->so_oobmark ||
3292 (so->so_rcv.sb_state & SBS_RCVATMARK))
3293 revents |= events & (POLLPRI | POLLRDBAND);
3294 if ((events & POLLINIGNEOF) == 0) {
3295 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
3296 revents |= events & (POLLIN | POLLRDNORM);
3297 if (so->so_snd.sb_state & SBS_CANTSENDMORE)
3303 (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
3304 selrecord(td, &so->so_rdsel);
3305 so->so_rcv.sb_flags |= SB_SEL;
3307 if (events & (POLLOUT | POLLWRNORM)) {
3308 selrecord(td, &so->so_wrsel);
3309 so->so_snd.sb_flags |= SB_SEL;
3312 SOCKBUF_UNLOCK(&so->so_rcv);
3313 SOCKBUF_UNLOCK(&so->so_snd);
3320 soo_kqfilter(struct file *fp, struct knote *kn)
3322 struct socket *so = kn->kn_fp->f_data;
3326 switch (kn->kn_filter) {
3328 kn->kn_fop = &soread_filtops;
3329 knl = &so->so_rdsel.si_note;
3333 kn->kn_fop = &sowrite_filtops;
3334 knl = &so->so_wrsel.si_note;
3338 kn->kn_fop = &soempty_filtops;
3339 knl = &so->so_wrsel.si_note;
3347 if (SOLISTENING(so)) {
3348 knlist_add(knl, kn, 1);
3351 knlist_add(knl, kn, 1);
3352 sb->sb_flags |= SB_KNOTE;
3360 * Some routines that return EOPNOTSUPP for entry points that are not
3361 * supported by a protocol. Fill in as needed.
3364 pru_accept_notsupp(struct socket *so, struct sockaddr **nam)
3371 pru_aio_queue_notsupp(struct socket *so, struct kaiocb *job)
3378 pru_attach_notsupp(struct socket *so, int proto, struct thread *td)
3385 pru_bind_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
3392 pru_bindat_notsupp(int fd, struct socket *so, struct sockaddr *nam,
3400 pru_connect_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
3407 pru_connectat_notsupp(int fd, struct socket *so, struct sockaddr *nam,
3415 pru_connect2_notsupp(struct socket *so1, struct socket *so2)
3422 pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
3423 struct ifnet *ifp, struct thread *td)
3430 pru_disconnect_notsupp(struct socket *so)
3437 pru_listen_notsupp(struct socket *so, int backlog, struct thread *td)
3444 pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam)
3451 pru_rcvd_notsupp(struct socket *so, int flags)
3458 pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags)
3465 pru_send_notsupp(struct socket *so, int flags, struct mbuf *m,
3466 struct sockaddr *addr, struct mbuf *control, struct thread *td)
3473 pru_ready_notsupp(struct socket *so, struct mbuf *m, int count)
3476 return (EOPNOTSUPP);
3480 * This isn't really a ``null'' operation, but it's the default one and
3481 * doesn't do anything destructive.
3484 pru_sense_null(struct socket *so, struct stat *sb)
3487 sb->st_blksize = so->so_snd.sb_hiwat;
3492 pru_shutdown_notsupp(struct socket *so)
3499 pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam)
3506 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
3507 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
3514 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
3515 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
3522 pru_sopoll_notsupp(struct socket *so, int events, struct ucred *cred,
3530 filt_sordetach(struct knote *kn)
3532 struct socket *so = kn->kn_fp->f_data;
3535 knlist_remove(&so->so_rdsel.si_note, kn, 1);
3536 if (!SOLISTENING(so) && knlist_empty(&so->so_rdsel.si_note))
3537 so->so_rcv.sb_flags &= ~SB_KNOTE;
3538 so_rdknl_unlock(so);
3543 filt_soread(struct knote *kn, long hint)
3547 so = kn->kn_fp->f_data;
3549 if (SOLISTENING(so)) {
3550 SOCK_LOCK_ASSERT(so);
3551 kn->kn_data = so->sol_qlen;
3552 return (!TAILQ_EMPTY(&so->sol_comp));
3555 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
3557 kn->kn_data = sbavail(&so->so_rcv) - so->so_rcv.sb_ctl;
3558 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
3559 kn->kn_flags |= EV_EOF;
3560 kn->kn_fflags = so->so_error;
3562 } else if (so->so_error) /* temporary udp error */
3565 if (kn->kn_sfflags & NOTE_LOWAT) {
3566 if (kn->kn_data >= kn->kn_sdata)
3568 } else if (sbavail(&so->so_rcv) >= so->so_rcv.sb_lowat)
3571 /* This hook returning non-zero indicates an event, not error */
3572 return (hhook_run_socket(so, NULL, HHOOK_FILT_SOREAD));
3576 filt_sowdetach(struct knote *kn)
3578 struct socket *so = kn->kn_fp->f_data;
3581 knlist_remove(&so->so_wrsel.si_note, kn, 1);
3582 if (!SOLISTENING(so) && knlist_empty(&so->so_wrsel.si_note))
3583 so->so_snd.sb_flags &= ~SB_KNOTE;
3584 so_wrknl_unlock(so);
3589 filt_sowrite(struct knote *kn, long hint)
3593 so = kn->kn_fp->f_data;
3595 if (SOLISTENING(so))
3598 SOCKBUF_LOCK_ASSERT(&so->so_snd);
3599 kn->kn_data = sbspace(&so->so_snd);
3601 hhook_run_socket(so, kn, HHOOK_FILT_SOWRITE);
3603 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
3604 kn->kn_flags |= EV_EOF;
3605 kn->kn_fflags = so->so_error;
3607 } else if (so->so_error) /* temporary udp error */
3609 else if (((so->so_state & SS_ISCONNECTED) == 0) &&
3610 (so->so_proto->pr_flags & PR_CONNREQUIRED))
3612 else if (kn->kn_sfflags & NOTE_LOWAT)
3613 return (kn->kn_data >= kn->kn_sdata);
3615 return (kn->kn_data >= so->so_snd.sb_lowat);
3619 filt_soempty(struct knote *kn, long hint)
3623 so = kn->kn_fp->f_data;
3625 if (SOLISTENING(so))
3628 SOCKBUF_LOCK_ASSERT(&so->so_snd);
3629 kn->kn_data = sbused(&so->so_snd);
3631 if (kn->kn_data == 0)
3638 socheckuid(struct socket *so, uid_t uid)
3643 if (so->so_cred->cr_uid != uid)
3649 * These functions are used by protocols to notify the socket layer (and its
3650 * consumers) of state changes in the sockets driven by protocol-side events.
3654 * Procedures to manipulate state flags of socket and do appropriate wakeups.
3656 * Normal sequence from the active (originating) side is that
3657 * soisconnecting() is called during processing of connect() call, resulting
3658 * in an eventual call to soisconnected() if/when the connection is
3659 * established. When the connection is torn down soisdisconnecting() is
3660 * called during processing of disconnect() call, and soisdisconnected() is
3661 * called when the connection to the peer is totally severed. The semantics
3662 * of these routines are such that connectionless protocols can call
3663 * soisconnected() and soisdisconnected() only, bypassing the in-progress
3664 * calls when setting up a ``connection'' takes no time.
3666 * From the passive side, a socket is created with two queues of sockets:
3667 * so_incomp for connections in progress and so_comp for connections already
3668 * made and awaiting user acceptance. As a protocol is preparing incoming
3669 * connections, it creates a socket structure queued on so_incomp by calling
3670 * sonewconn(). When the connection is established, soisconnected() is
3671 * called, and transfers the socket structure to so_comp, making it available
3674 * If a socket is closed with sockets on either so_incomp or so_comp, these
3675 * sockets are dropped.
3677 * If higher-level protocols are implemented in the kernel, the wakeups done
3678 * here will sometimes cause software-interrupt process scheduling.
3681 soisconnecting(struct socket *so)
3685 so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
3686 so->so_state |= SS_ISCONNECTING;
3691 soisconnected(struct socket *so)
3695 so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
3696 so->so_state |= SS_ISCONNECTED;
3698 if (so->so_qstate == SQ_INCOMP) {
3699 struct socket *head = so->so_listen;
3702 KASSERT(head, ("%s: so %p on incomp of NULL", __func__, so));
3704 * Promoting a socket from incomplete queue to complete, we
3705 * need to go through reverse order of locking. We first do
3706 * trylock, and if that doesn't succeed, we go the hard way
3707 * leaving a reference and rechecking consistency after proper
3710 if (__predict_false(SOLISTEN_TRYLOCK(head) == 0)) {
3713 SOLISTEN_LOCK(head);
3715 if (__predict_false(head != so->so_listen)) {
3717 * The socket went off the listen queue,
3718 * should be lost race to close(2) of sol.
3719 * The socket is about to soabort().
3725 /* Not the last one, as so holds a ref. */
3726 refcount_release(&head->so_count);
3729 if ((so->so_options & SO_ACCEPTFILTER) == 0) {
3730 TAILQ_REMOVE(&head->sol_incomp, so, so_list);
3731 head->sol_incqlen--;
3732 TAILQ_INSERT_TAIL(&head->sol_comp, so, so_list);
3734 so->so_qstate = SQ_COMP;
3736 solisten_wakeup(head); /* unlocks */
3738 SOCKBUF_LOCK(&so->so_rcv);
3739 soupcall_set(so, SO_RCV,
3740 head->sol_accept_filter->accf_callback,
3741 head->sol_accept_filter_arg);
3742 so->so_options &= ~SO_ACCEPTFILTER;
3743 ret = head->sol_accept_filter->accf_callback(so,
3744 head->sol_accept_filter_arg, M_NOWAIT);
3745 if (ret == SU_ISCONNECTED) {
3746 soupcall_clear(so, SO_RCV);
3747 SOCKBUF_UNLOCK(&so->so_rcv);
3750 SOCKBUF_UNLOCK(&so->so_rcv);
3752 SOLISTEN_UNLOCK(head);
3757 wakeup(&so->so_timeo);
3763 soisdisconnecting(struct socket *so)
3767 so->so_state &= ~SS_ISCONNECTING;
3768 so->so_state |= SS_ISDISCONNECTING;
3770 if (!SOLISTENING(so)) {
3771 SOCKBUF_LOCK(&so->so_rcv);
3772 socantrcvmore_locked(so);
3773 SOCKBUF_LOCK(&so->so_snd);
3774 socantsendmore_locked(so);
3777 wakeup(&so->so_timeo);
3781 soisdisconnected(struct socket *so)
3785 so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
3786 so->so_state |= SS_ISDISCONNECTED;
3788 if (!SOLISTENING(so)) {
3790 SOCKBUF_LOCK(&so->so_rcv);
3791 socantrcvmore_locked(so);
3792 SOCKBUF_LOCK(&so->so_snd);
3793 sbdrop_locked(&so->so_snd, sbused(&so->so_snd));
3794 socantsendmore_locked(so);
3797 wakeup(&so->so_timeo);
3801 * Make a copy of a sockaddr in a malloced buffer of type M_SONAME.
3804 sodupsockaddr(const struct sockaddr *sa, int mflags)
3806 struct sockaddr *sa2;
3808 sa2 = malloc(sa->sa_len, M_SONAME, mflags);
3810 bcopy(sa, sa2, sa->sa_len);
3815 * Register per-socket buffer upcalls.
3818 soupcall_set(struct socket *so, int which, so_upcall_t func, void *arg)
3822 KASSERT(!SOLISTENING(so), ("%s: so %p listening", __func__, so));
3832 panic("soupcall_set: bad which");
3834 SOCKBUF_LOCK_ASSERT(sb);
3835 sb->sb_upcall = func;
3836 sb->sb_upcallarg = arg;
3837 sb->sb_flags |= SB_UPCALL;
3841 soupcall_clear(struct socket *so, int which)
3845 KASSERT(!SOLISTENING(so), ("%s: so %p listening", __func__, so));
3855 panic("soupcall_clear: bad which");
3857 SOCKBUF_LOCK_ASSERT(sb);
3858 KASSERT(sb->sb_upcall != NULL,
3859 ("%s: so %p no upcall to clear", __func__, so));
3860 sb->sb_upcall = NULL;
3861 sb->sb_upcallarg = NULL;
3862 sb->sb_flags &= ~SB_UPCALL;
3866 solisten_upcall_set(struct socket *so, so_upcall_t func, void *arg)
3869 SOLISTEN_LOCK_ASSERT(so);
3870 so->sol_upcall = func;
3871 so->sol_upcallarg = arg;
3875 so_rdknl_lock(void *arg)
3877 struct socket *so = arg;
3879 if (SOLISTENING(so))
3882 SOCKBUF_LOCK(&so->so_rcv);
3886 so_rdknl_unlock(void *arg)
3888 struct socket *so = arg;
3890 if (SOLISTENING(so))
3893 SOCKBUF_UNLOCK(&so->so_rcv);
3897 so_rdknl_assert_locked(void *arg)
3899 struct socket *so = arg;
3901 if (SOLISTENING(so))
3902 SOCK_LOCK_ASSERT(so);
3904 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
3908 so_rdknl_assert_unlocked(void *arg)
3910 struct socket *so = arg;
3912 if (SOLISTENING(so))
3913 SOCK_UNLOCK_ASSERT(so);
3915 SOCKBUF_UNLOCK_ASSERT(&so->so_rcv);
3919 so_wrknl_lock(void *arg)
3921 struct socket *so = arg;
3923 if (SOLISTENING(so))
3926 SOCKBUF_LOCK(&so->so_snd);
3930 so_wrknl_unlock(void *arg)
3932 struct socket *so = arg;
3934 if (SOLISTENING(so))
3937 SOCKBUF_UNLOCK(&so->so_snd);
3941 so_wrknl_assert_locked(void *arg)
3943 struct socket *so = arg;
3945 if (SOLISTENING(so))
3946 SOCK_LOCK_ASSERT(so);
3948 SOCKBUF_LOCK_ASSERT(&so->so_snd);
3952 so_wrknl_assert_unlocked(void *arg)
3954 struct socket *so = arg;
3956 if (SOLISTENING(so))
3957 SOCK_UNLOCK_ASSERT(so);
3959 SOCKBUF_UNLOCK_ASSERT(&so->so_snd);
3963 * Create an external-format (``xsocket'') structure using the information in
3964 * the kernel-format socket structure pointed to by so. This is done to
3965 * reduce the spew of irrelevant information over this interface, to isolate
3966 * user code from changes in the kernel structure, and potentially to provide
3967 * information-hiding if we decide that some of this information should be
3968 * hidden from users.
3971 sotoxsocket(struct socket *so, struct xsocket *xso)
3974 xso->xso_len = sizeof *xso;
3976 xso->so_type = so->so_type;
3977 xso->so_options = so->so_options;
3978 xso->so_linger = so->so_linger;
3979 xso->so_state = so->so_state;
3980 xso->so_pcb = so->so_pcb;
3981 xso->xso_protocol = so->so_proto->pr_protocol;
3982 xso->xso_family = so->so_proto->pr_domain->dom_family;
3983 xso->so_timeo = so->so_timeo;
3984 xso->so_error = so->so_error;
3985 xso->so_uid = so->so_cred->cr_uid;
3986 xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
3987 if (SOLISTENING(so)) {
3988 xso->so_qlen = so->sol_qlen;
3989 xso->so_incqlen = so->sol_incqlen;
3990 xso->so_qlimit = so->sol_qlimit;
3991 xso->so_oobmark = 0;
3992 bzero(&xso->so_snd, sizeof(xso->so_snd));
3993 bzero(&xso->so_rcv, sizeof(xso->so_rcv));
3995 xso->so_state |= so->so_qstate;
3996 xso->so_qlen = xso->so_incqlen = xso->so_qlimit = 0;
3997 xso->so_oobmark = so->so_oobmark;
3998 sbtoxsockbuf(&so->so_snd, &xso->so_snd);
3999 sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
4004 so_sockbuf_rcv(struct socket *so)
4007 return (&so->so_rcv);
4011 so_sockbuf_snd(struct socket *so)
4014 return (&so->so_snd);
4018 so_state_get(const struct socket *so)
4021 return (so->so_state);
4025 so_state_set(struct socket *so, int val)
4032 so_options_get(const struct socket *so)
4035 return (so->so_options);
4039 so_options_set(struct socket *so, int val)
4042 so->so_options = val;
4046 so_error_get(const struct socket *so)
4049 return (so->so_error);
4053 so_error_set(struct socket *so, int val)
4060 so_linger_get(const struct socket *so)
4063 return (so->so_linger);
4067 so_linger_set(struct socket *so, int val)
4070 so->so_linger = val;
4074 so_protosw_get(const struct socket *so)
4077 return (so->so_proto);
4081 so_protosw_set(struct socket *so, struct protosw *val)
4088 so_sorwakeup(struct socket *so)
4095 so_sowwakeup(struct socket *so)
4102 so_sorwakeup_locked(struct socket *so)
4105 sorwakeup_locked(so);
4109 so_sowwakeup_locked(struct socket *so)
4112 sowwakeup_locked(so);
4116 so_lock(struct socket *so)
4123 so_unlock(struct socket *so)