1 /*-
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2004 The FreeBSD Foundation
5 * Copyright (c) 2004-2008 Robert N. M. Watson
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
33 */
34
35 /*
36 * Comments on the socket life cycle:
37 *
38 * soalloc() sets of socket layer state for a socket, called only by
39 * socreate() and sonewconn(). Socket layer private.
40 *
41 * sodealloc() tears down socket layer state for a socket, called only by
42 * sofree() and sonewconn(). Socket layer private.
43 *
44 * pru_attach() associates protocol layer state with an allocated socket;
45 * called only once, may fail, aborting socket allocation. This is called
46 * from socreate() and sonewconn(). Socket layer private.
47 *
48 * pru_detach() disassociates protocol layer state from an attached socket,
49 * and will be called exactly once for sockets in which pru_attach() has
50 * been successfully called. If pru_attach() returned an error,
51 * pru_detach() will not be called. Socket layer private.
52 *
53 * pru_abort() and pru_close() notify the protocol layer that the last
54 * consumer of a socket is starting to tear down the socket, and that the
55 * protocol should terminate the connection. Historically, pru_abort() also
56 * detached protocol state from the socket state, but this is no longer the
57 * case.
58 *
59 * socreate() creates a socket and attaches protocol state. This is a public
60 * interface that may be used by socket layer consumers to create new
61 * sockets.
62 *
63 * sonewconn() creates a socket and attaches protocol state. This is a
64 * public interface that may be used by protocols to create new sockets when
65 * a new connection is received and will be available for accept() on a
66 * listen socket.
67 *
68 * soclose() destroys a socket after possibly waiting for it to disconnect.
69 * This is a public interface that socket consumers should use to close and
70 * release a socket when done with it.
71 *
72 * soabort() destroys a socket without waiting for it to disconnect (used
73 * only for incoming connections that are already partially or fully
74 * connected). This is used internally by the socket layer when clearing
75 * listen socket queues (due to overflow or close on the listen socket), but
76 * is also a public interface protocols may use to abort connections in
77 * their incomplete listen queues should they no longer be required. Sockets
78 * placed in completed connection listen queues should not be aborted for
79 * reasons described in the comment above the soclose() implementation. This
80 * is not a general purpose close routine, and except in the specific
81 * circumstances described here, should not be used.
82 *
83 * sofree() will free a socket and its protocol state if all references on
84 * the socket have been released, and is the public interface to attempt to
85 * free a socket when a reference is removed. This is a socket layer private
86 * interface.
87 *
88 * NOTE: In addition to socreate() and soclose(), which provide a single
89 * socket reference to the consumer to be managed as required, there are two
90 * calls to explicitly manage socket references, soref(), and sorele().
91 * Currently, these are generally required only when transitioning a socket
92 * from a listen queue to a file descriptor, in order to prevent garbage
93 * collection of the socket at an untimely moment. For a number of reasons,
94 * these interfaces are not preferred, and should be avoided.
95 */
96
97 #include <sys/cdefs.h>
98 __FBSDID("$FreeBSD$");
99
100 #include "opt_inet.h"
101 #include "opt_mac.h"
102 #include "opt_zero.h"
103 #include "opt_compat.h"
104
105 #include <sys/param.h>
106 #include <sys/systm.h>
107 #include <sys/fcntl.h>
108 #include <sys/limits.h>
109 #include <sys/lock.h>
110 #include <sys/mac.h>
111 #include <sys/malloc.h>
112 #include <sys/mbuf.h>
113 #include <sys/mutex.h>
114 #include <sys/domain.h>
115 #include <sys/file.h> /* for struct knote */
116 #include <sys/kernel.h>
117 #include <sys/event.h>
118 #include <sys/eventhandler.h>
119 #include <sys/poll.h>
120 #include <sys/proc.h>
121 #include <sys/protosw.h>
122 #include <sys/socket.h>
123 #include <sys/socketvar.h>
124 #include <sys/resourcevar.h>
125 #include <net/route.h>
126 #include <sys/signalvar.h>
127 #include <sys/stat.h>
128 #include <sys/sx.h>
129 #include <sys/sysctl.h>
130 #include <sys/uio.h>
131 #include <sys/jail.h>
132
133 #include <security/mac/mac_framework.h>
134
135 #include <vm/uma.h>
136
137 #ifdef COMPAT_IA32
138 #include <sys/mount.h>
139 #include <compat/freebsd32/freebsd32.h>
140
141 extern struct sysentvec ia32_freebsd_sysvec;
142 #endif
143
144 static int soreceive_rcvoob(struct socket *so, struct uio *uio,
145 int flags);
146
147 static void filt_sordetach(struct knote *kn);
148 static int filt_soread(struct knote *kn, long hint);
149 static void filt_sowdetach(struct knote *kn);
150 static int filt_sowrite(struct knote *kn, long hint);
151 static int filt_solisten(struct knote *kn, long hint);
152
153 static struct filterops solisten_filtops =
154 { 1, NULL, filt_sordetach, filt_solisten };
155 static struct filterops soread_filtops =
156 { 1, NULL, filt_sordetach, filt_soread };
157 static struct filterops sowrite_filtops =
158 { 1, NULL, filt_sowdetach, filt_sowrite };
159
160 uma_zone_t socket_zone;
161 so_gen_t so_gencnt; /* generation count for sockets */
162
163 int maxsockets;
164
165 MALLOC_DEFINE(M_SONAME, "soname", "socket name");
166 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
167
168 static int somaxconn = SOMAXCONN;
169 static int sysctl_somaxconn(SYSCTL_HANDLER_ARGS);
170 /* XXX: we dont have SYSCTL_USHORT */
171 SYSCTL_PROC(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLTYPE_UINT | CTLFLAG_RW,
172 0, sizeof(int), sysctl_somaxconn, "I", "Maximum pending socket connection "
173 "queue size");
174 static int numopensockets;
175 SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD,
176 &numopensockets, 0, "Number of open sockets");
177 #ifdef ZERO_COPY_SOCKETS
178 /* These aren't static because they're used in other files. */
179 int so_zero_copy_send = 1;
180 int so_zero_copy_receive = 1;
181 SYSCTL_NODE(_kern_ipc, OID_AUTO, zero_copy, CTLFLAG_RD, 0,
182 "Zero copy controls");
183 SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, receive, CTLFLAG_RW,
184 &so_zero_copy_receive, 0, "Enable zero copy receive");
185 SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, send, CTLFLAG_RW,
186 &so_zero_copy_send, 0, "Enable zero copy send");
187 #endif /* ZERO_COPY_SOCKETS */
188
189 /*
190 * accept_mtx locks down per-socket fields relating to accept queues. See
191 * socketvar.h for an annotation of the protected fields of struct socket.
192 */
193 struct mtx accept_mtx;
194 MTX_SYSINIT(accept_mtx, &accept_mtx, "accept", MTX_DEF);
195
196 /*
197 * so_global_mtx protects so_gencnt, numopensockets, and the per-socket
198 * so_gencnt field.
199 */
200 static struct mtx so_global_mtx;
201 MTX_SYSINIT(so_global_mtx, &so_global_mtx, "so_glabel", MTX_DEF);
202
203 /*
204 * General IPC sysctl name space, used by sockets and a variety of other IPC
205 * types.
206 */
207 SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW, 0, "IPC");
208
209 /*
210 * Sysctl to get and set the maximum global sockets limit. Notify protocols
211 * of the change so that they can update their dependent limits as required.
212 */
213 static int
214 sysctl_maxsockets(SYSCTL_HANDLER_ARGS)
215 {
216 int error, newmaxsockets;
217
218 newmaxsockets = maxsockets;
219 error = sysctl_handle_int(oidp, &newmaxsockets, 0, req);
220 if (error == 0 && req->newptr) {
221 if (newmaxsockets > maxsockets) {
222 maxsockets = newmaxsockets;
223 if (maxsockets > ((maxfiles / 4) * 3)) {
224 maxfiles = (maxsockets * 5) / 4;
225 maxfilesperproc = (maxfiles * 9) / 10;
226 }
227 EVENTHANDLER_INVOKE(maxsockets_change);
228 } else
229 error = EINVAL;
230 }
231 return (error);
232 }
233
234 SYSCTL_PROC(_kern_ipc, OID_AUTO, maxsockets, CTLTYPE_INT|CTLFLAG_RW,
235 &maxsockets, 0, sysctl_maxsockets, "IU",
236 "Maximum number of sockets avaliable");
237
238 /*
239 * Initialise maxsockets.
240 */
241 static void init_maxsockets(void *ignored)
242 {
243 TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
244 maxsockets = imax(maxsockets, imax(maxfiles, nmbclusters));
245 }
246 SYSINIT(param, SI_SUB_TUNABLES, SI_ORDER_ANY, init_maxsockets, NULL);
247
248 /*
249 * Socket operation routines. These routines are called by the routines in
250 * sys_socket.c or from a system process, and implement the semantics of
251 * socket operations by switching out to the protocol specific routines.
252 */
253
254 /*
255 * Get a socket structure from our zone, and initialize it. Note that it
256 * would probably be better to allocate socket and PCB at the same time, but
257 * I'm not convinced that all the protocols can be easily modified to do
258 * this.
259 *
260 * soalloc() returns a socket with a ref count of 0.
261 */
262 static struct socket *
263 soalloc(void)
264 {
265 struct socket *so;
266
267 so = uma_zalloc(socket_zone, M_NOWAIT | M_ZERO);
268 if (so == NULL)
269 return (NULL);
270 #ifdef MAC
271 if (mac_init_socket(so, M_NOWAIT) != 0) {
272 uma_zfree(socket_zone, so);
273 return (NULL);
274 }
275 #endif
276 SOCKBUF_LOCK_INIT(&so->so_snd, "so_snd");
277 SOCKBUF_LOCK_INIT(&so->so_rcv, "so_rcv");
278 sx_init(&so->so_snd.sb_sx, "so_snd_sx");
279 sx_init(&so->so_rcv.sb_sx, "so_rcv_sx");
280 TAILQ_INIT(&so->so_aiojobq);
281 mtx_lock(&so_global_mtx);
282 so->so_gencnt = ++so_gencnt;
283 ++numopensockets;
284 mtx_unlock(&so_global_mtx);
285 return (so);
286 }
287
288 /*
289 * Free the storage associated with a socket at the socket layer, tear down
290 * locks, labels, etc. All protocol state is assumed already to have been
291 * torn down (and possibly never set up) by the caller.
292 */
293 static void
294 sodealloc(struct socket *so)
295 {
296
297 KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count));
298 KASSERT(so->so_pcb == NULL, ("sodealloc(): so_pcb != NULL"));
299
300 mtx_lock(&so_global_mtx);
301 so->so_gencnt = ++so_gencnt;
302 --numopensockets; /* Could be below, but faster here. */
303 mtx_unlock(&so_global_mtx);
304 if (so->so_rcv.sb_hiwat)
305 (void)chgsbsize(so->so_cred->cr_uidinfo,
306 &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
307 if (so->so_snd.sb_hiwat)
308 (void)chgsbsize(so->so_cred->cr_uidinfo,
309 &so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
310 #ifdef INET
311 /* remove acccept filter if one is present. */
312 if (so->so_accf != NULL)
313 do_setopt_accept_filter(so, NULL);
314 #endif
315 #ifdef MAC
316 mac_destroy_socket(so);
317 #endif
318 crfree(so->so_cred);
319 sx_destroy(&so->so_snd.sb_sx);
320 sx_destroy(&so->so_rcv.sb_sx);
321 SOCKBUF_LOCK_DESTROY(&so->so_snd);
322 SOCKBUF_LOCK_DESTROY(&so->so_rcv);
323 uma_zfree(socket_zone, so);
324 }
325
326 /*
327 * socreate returns a socket with a ref count of 1. The socket should be
328 * closed with soclose().
329 */
330 int
331 socreate(int dom, struct socket **aso, int type, int proto,
332 struct ucred *cred, struct thread *td)
333 {
334 struct protosw *prp;
335 struct socket *so;
336 int error;
337
338 if (proto)
339 prp = pffindproto(dom, proto, type);
340 else
341 prp = pffindtype(dom, type);
342
343 if (prp == NULL || prp->pr_usrreqs->pru_attach == NULL ||
344 prp->pr_usrreqs->pru_attach == pru_attach_notsupp)
345 return (EPROTONOSUPPORT);
346
347 if (jailed(cred) && jail_socket_unixiproute_only &&
348 prp->pr_domain->dom_family != PF_LOCAL &&
349 prp->pr_domain->dom_family != PF_INET &&
350 prp->pr_domain->dom_family != PF_ROUTE) {
351 return (EPROTONOSUPPORT);
352 }
353
354 if (prp->pr_type != type)
355 return (EPROTOTYPE);
356 so = soalloc();
357 if (so == NULL)
358 return (ENOBUFS);
359
360 TAILQ_INIT(&so->so_incomp);
361 TAILQ_INIT(&so->so_comp);
362 so->so_type = type;
363 so->so_cred = crhold(cred);
364 if ((prp->pr_domain->dom_family == PF_INET) ||
365 (prp->pr_domain->dom_family == PF_ROUTE))
366 so->so_fibnum = td->td_proc->p_fibnum;
367 else
368 so->so_fibnum = 0;
369 so->so_proto = prp;
370 #ifdef MAC
371 mac_create_socket(cred, so);
372 #endif
373 knlist_init(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv),
374 NULL, NULL, NULL);
375 knlist_init(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd),
376 NULL, NULL, NULL);
377 so->so_count = 1;
378 /*
379 * Auto-sizing of socket buffers is managed by the protocols and
380 * the appropriate flags must be set in the pru_attach function.
381 */
382 error = (*prp->pr_usrreqs->pru_attach)(so, proto, td);
383 if (error) {
384 KASSERT(so->so_count == 1, ("socreate: so_count %d",
385 so->so_count));
386 so->so_count = 0;
387 sodealloc(so);
388 return (error);
389 }
390 *aso = so;
391 return (0);
392 }
393
394 #ifdef REGRESSION
395 static int regression_sonewconn_earlytest = 1;
396 SYSCTL_INT(_regression, OID_AUTO, sonewconn_earlytest, CTLFLAG_RW,
397 ®ression_sonewconn_earlytest, 0, "Perform early sonewconn limit test");
398 #endif
399
400 /*
401 * When an attempt at a new connection is noted on a socket which accepts
402 * connections, sonewconn is called. If the connection is possible (subject
403 * to space constraints, etc.) then we allocate a new structure, propoerly
404 * linked into the data structure of the original socket, and return this.
405 * Connstatus may be 0, or SO_ISCONFIRMING, or SO_ISCONNECTED.
406 *
407 * Note: the ref count on the socket is 0 on return.
408 */
409 struct socket *
410 sonewconn(struct socket *head, int connstatus)
411 {
412 struct socket *so;
413 int over;
414
415 ACCEPT_LOCK();
416 over = (head->so_qlen > 3 * head->so_qlimit / 2);
417 ACCEPT_UNLOCK();
418 #ifdef REGRESSION
419 if (regression_sonewconn_earlytest && over)
420 #else
421 if (over)
422 #endif
423 return (NULL);
424 so = soalloc();
425 if (so == NULL)
426 return (NULL);
427 if ((head->so_options & SO_ACCEPTFILTER) != 0)
428 connstatus = 0;
429 so->so_head = head;
430 so->so_type = head->so_type;
431 so->so_options = head->so_options &~ SO_ACCEPTCONN;
432 so->so_linger = head->so_linger;
433 so->so_state = head->so_state | SS_NOFDREF;
434 so->so_proto = head->so_proto;
435 so->so_cred = crhold(head->so_cred);
436 #ifdef MAC
437 SOCK_LOCK(head);
438 mac_create_socket_from_socket(head, so);
439 SOCK_UNLOCK(head);
440 #endif
441 knlist_init(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv),
442 NULL, NULL, NULL);
443 knlist_init(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd),
444 NULL, NULL, NULL);
445 if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat) ||
446 (*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
447 sodealloc(so);
448 return (NULL);
449 }
450 so->so_rcv.sb_lowat = head->so_rcv.sb_lowat;
451 so->so_snd.sb_lowat = head->so_snd.sb_lowat;
452 so->so_rcv.sb_timeo = head->so_rcv.sb_timeo;
453 so->so_snd.sb_timeo = head->so_snd.sb_timeo;
454 so->so_rcv.sb_flags |= head->so_rcv.sb_flags & SB_AUTOSIZE;
455 so->so_snd.sb_flags |= head->so_snd.sb_flags & SB_AUTOSIZE;
456 so->so_state |= connstatus;
457 ACCEPT_LOCK();
458 if (connstatus) {
459 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
460 so->so_qstate |= SQ_COMP;
461 head->so_qlen++;
462 } else {
463 /*
464 * Keep removing sockets from the head until there's room for
465 * us to insert on the tail. In pre-locking revisions, this
466 * was a simple if(), but as we could be racing with other
467 * threads and soabort() requires dropping locks, we must
468 * loop waiting for the condition to be true.
469 */
470 while (head->so_incqlen > head->so_qlimit) {
471 struct socket *sp;
472 sp = TAILQ_FIRST(&head->so_incomp);
473 TAILQ_REMOVE(&head->so_incomp, sp, so_list);
474 head->so_incqlen--;
475 sp->so_qstate &= ~SQ_INCOMP;
476 sp->so_head = NULL;
477 ACCEPT_UNLOCK();
478 soabort(sp);
479 ACCEPT_LOCK();
480 }
481 TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
482 so->so_qstate |= SQ_INCOMP;
483 head->so_incqlen++;
484 }
485 ACCEPT_UNLOCK();
486 if (connstatus) {
487 sorwakeup(head);
488 wakeup_one(&head->so_timeo);
489 }
490 return (so);
491 }
492
493 int
494 sobind(struct socket *so, struct sockaddr *nam, struct thread *td)
495 {
496
497 return ((*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td));
498 }
499
500 /*
501 * solisten() transitions a socket from a non-listening state to a listening
502 * state, but can also be used to update the listen queue depth on an
503 * existing listen socket. The protocol will call back into the sockets
504 * layer using solisten_proto_check() and solisten_proto() to check and set
505 * socket-layer listen state. Call backs are used so that the protocol can
506 * acquire both protocol and socket layer locks in whatever order is required
507 * by the protocol.
508 *
509 * Protocol implementors are advised to hold the socket lock across the
510 * socket-layer test and set to avoid races at the socket layer.
511 */
512 int
513 solisten(struct socket *so, int backlog, struct thread *td)
514 {
515
516 return ((*so->so_proto->pr_usrreqs->pru_listen)(so, backlog, td));
517 }
518
519 int
520 solisten_proto_check(struct socket *so)
521 {
522
523 SOCK_LOCK_ASSERT(so);
524
525 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
526 SS_ISDISCONNECTING))
527 return (EINVAL);
528 return (0);
529 }
530
531 void
532 solisten_proto(struct socket *so, int backlog)
533 {
534
535 SOCK_LOCK_ASSERT(so);
536
537 if (backlog < 0 || backlog > somaxconn)
538 backlog = somaxconn;
539 so->so_qlimit = backlog;
540 so->so_options |= SO_ACCEPTCONN;
541 }
542
543 /*
544 * Attempt to free a socket. This should really be sotryfree().
545 *
546 * sofree() will succeed if:
547 *
548 * - There are no outstanding file descriptor references or related consumers
549 * (so_count == 0).
550 *
551 * - The socket has been closed by user space, if ever open (SS_NOFDREF).
552 *
553 * - The protocol does not have an outstanding strong reference on the socket
554 * (SS_PROTOREF).
555 *
556 * - The socket is not in a completed connection queue, so a process has been
557 * notified that it is present. If it is removed, the user process may
558 * block in accept() despite select() saying the socket was ready.
559 *
560 * Otherwise, it will quietly abort so that a future call to sofree(), when
561 * conditions are right, can succeed.
562 */
563 void
564 sofree(struct socket *so)
565 {
566 struct protosw *pr = so->so_proto;
567 struct socket *head;
568
569 ACCEPT_LOCK_ASSERT();
570 SOCK_LOCK_ASSERT(so);
571
572 if ((so->so_state & SS_NOFDREF) == 0 || so->so_count != 0 ||
573 (so->so_state & SS_PROTOREF) || (so->so_qstate & SQ_COMP)) {
574 SOCK_UNLOCK(so);
575 ACCEPT_UNLOCK();
576 return;
577 }
578
579 head = so->so_head;
580 if (head != NULL) {
581 KASSERT((so->so_qstate & SQ_COMP) != 0 ||
582 (so->so_qstate & SQ_INCOMP) != 0,
583 ("sofree: so_head != NULL, but neither SQ_COMP nor "
584 "SQ_INCOMP"));
585 KASSERT((so->so_qstate & SQ_COMP) == 0 ||
586 (so->so_qstate & SQ_INCOMP) == 0,
587 ("sofree: so->so_qstate is SQ_COMP and also SQ_INCOMP"));
588 TAILQ_REMOVE(&head->so_incomp, so, so_list);
589 head->so_incqlen--;
590 so->so_qstate &= ~SQ_INCOMP;
591 so->so_head = NULL;
592 }
593 KASSERT((so->so_qstate & SQ_COMP) == 0 &&
594 (so->so_qstate & SQ_INCOMP) == 0,
595 ("sofree: so_head == NULL, but still SQ_COMP(%d) or SQ_INCOMP(%d)",
596 so->so_qstate & SQ_COMP, so->so_qstate & SQ_INCOMP));
597 if (so->so_options & SO_ACCEPTCONN) {
598 KASSERT((TAILQ_EMPTY(&so->so_comp)), ("sofree: so_comp populated"));
599 KASSERT((TAILQ_EMPTY(&so->so_incomp)), ("sofree: so_comp populated"));
600 }
601 SOCK_UNLOCK(so);
602 ACCEPT_UNLOCK();
603
604 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
605 (*pr->pr_domain->dom_dispose)(so->so_rcv.sb_mb);
606 if (pr->pr_usrreqs->pru_detach != NULL)
607 (*pr->pr_usrreqs->pru_detach)(so);
608
609 /*
610 * From this point on, we assume that no other references to this
611 * socket exist anywhere else in the stack. Therefore, no locks need
612 * to be acquired or held.
613 *
614 * We used to do a lot of socket buffer and socket locking here, as
615 * well as invoke sorflush() and perform wakeups. The direct call to
616 * dom_dispose() and sbrelease_internal() are an inlining of what was
617 * necessary from sorflush().
618 *
619 * Notice that the socket buffer and kqueue state are torn down
620 * before calling pru_detach. This means that protocols shold not
621 * assume they can perform socket wakeups, etc, in their detach code.
622 */
623 sbdestroy(&so->so_snd, so);
624 sbdestroy(&so->so_rcv, so);
625 knlist_destroy(&so->so_rcv.sb_sel.si_note);
626 knlist_destroy(&so->so_snd.sb_sel.si_note);
627 sodealloc(so);
628 }
629
630 /*
631 * Close a socket on last file table reference removal. Initiate disconnect
632 * if connected. Free socket when disconnect complete.
633 *
634 * This function will sorele() the socket. Note that soclose() may be called
635 * prior to the ref count reaching zero. The actual socket structure will
636 * not be freed until the ref count reaches zero.
637 */
638 int
639 soclose(struct socket *so)
640 {
641 int error = 0;
642
643 KASSERT(!(so->so_state & SS_NOFDREF), ("soclose: SS_NOFDREF on enter"));
644
645 funsetown(&so->so_sigio);
646 if (so->so_state & SS_ISCONNECTED) {
647 if ((so->so_state & SS_ISDISCONNECTING) == 0) {
648 error = sodisconnect(so);
649 if (error)
650 goto drop;
651 }
652 if (so->so_options & SO_LINGER) {
653 if ((so->so_state & SS_ISDISCONNECTING) &&
654 (so->so_state & SS_NBIO))
655 goto drop;
656 while (so->so_state & SS_ISCONNECTED) {
657 error = tsleep(&so->so_timeo,
658 PSOCK | PCATCH, "soclos", so->so_linger * hz);
659 if (error)
660 break;
661 }
662 }
663 }
664
665 drop:
666 if (so->so_proto->pr_usrreqs->pru_close != NULL)
667 (*so->so_proto->pr_usrreqs->pru_close)(so);
668 if (so->so_options & SO_ACCEPTCONN) {
669 struct socket *sp;
670 ACCEPT_LOCK();
671 while ((sp = TAILQ_FIRST(&so->so_incomp)) != NULL) {
672 TAILQ_REMOVE(&so->so_incomp, sp, so_list);
673 so->so_incqlen--;
674 sp->so_qstate &= ~SQ_INCOMP;
675 sp->so_head = NULL;
676 ACCEPT_UNLOCK();
677 soabort(sp);
678 ACCEPT_LOCK();
679 }
680 while ((sp = TAILQ_FIRST(&so->so_comp)) != NULL) {
681 TAILQ_REMOVE(&so->so_comp, sp, so_list);
682 so->so_qlen--;
683 sp->so_qstate &= ~SQ_COMP;
684 sp->so_head = NULL;
685 ACCEPT_UNLOCK();
686 soabort(sp);
687 ACCEPT_LOCK();
688 }
689 ACCEPT_UNLOCK();
690 }
691 ACCEPT_LOCK();
692 SOCK_LOCK(so);
693 KASSERT((so->so_state & SS_NOFDREF) == 0, ("soclose: NOFDREF"));
694 so->so_state |= SS_NOFDREF;
695 sorele(so);
696 return (error);
697 }
698
699 /*
700 * soabort() is used to abruptly tear down a connection, such as when a
701 * resource limit is reached (listen queue depth exceeded), or if a listen
702 * socket is closed while there are sockets waiting to be accepted.
703 *
704 * This interface is tricky, because it is called on an unreferenced socket,
705 * and must be called only by a thread that has actually removed the socket
706 * from the listen queue it was on, or races with other threads are risked.
707 *
708 * This interface will call into the protocol code, so must not be called
709 * with any socket locks held. Protocols do call it while holding their own
710 * recursible protocol mutexes, but this is something that should be subject
711 * to review in the future.
712 */
713 void
714 soabort(struct socket *so)
715 {
716
717 /*
718 * In as much as is possible, assert that no references to this
719 * socket are held. This is not quite the same as asserting that the
720 * current thread is responsible for arranging for no references, but
721 * is as close as we can get for now.
722 */
723 KASSERT(so->so_count == 0, ("soabort: so_count"));
724 KASSERT((so->so_state & SS_PROTOREF) == 0, ("soabort: SS_PROTOREF"));
725 KASSERT(so->so_state & SS_NOFDREF, ("soabort: !SS_NOFDREF"));
726 KASSERT((so->so_state & SQ_COMP) == 0, ("soabort: SQ_COMP"));
727 KASSERT((so->so_state & SQ_INCOMP) == 0, ("soabort: SQ_INCOMP"));
728
729 if (so->so_proto->pr_usrreqs->pru_abort != NULL)
730 (*so->so_proto->pr_usrreqs->pru_abort)(so);
731 ACCEPT_LOCK();
732 SOCK_LOCK(so);
733 sofree(so);
734 }
735
736 int
737 soaccept(struct socket *so, struct sockaddr **nam)
738 {
739 int error;
740
741 SOCK_LOCK(so);
742 KASSERT((so->so_state & SS_NOFDREF) != 0, ("soaccept: !NOFDREF"));
743 so->so_state &= ~SS_NOFDREF;
744 SOCK_UNLOCK(so);
745 error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam);
746 return (error);
747 }
748
749 int
750 soconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
751 {
752 int error;
753
754 if (so->so_options & SO_ACCEPTCONN)
755 return (EOPNOTSUPP);
756 /*
757 * If protocol is connection-based, can only connect once.
758 * Otherwise, if connected, try to disconnect first. This allows
759 * user to disconnect by connecting to, e.g., a null address.
760 */
761 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
762 ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
763 (error = sodisconnect(so)))) {
764 error = EISCONN;
765 } else {
766 /*
767 * Prevent accumulated error from previous connection from
768 * biting us.
769 */
770 so->so_error = 0;
771 error = (*so->so_proto->pr_usrreqs->pru_connect)(so, nam, td);
772 }
773
774 return (error);
775 }
776
777 int
778 soconnect2(struct socket *so1, struct socket *so2)
779 {
780
781 return ((*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2));
782 }
783
784 int
785 sodisconnect(struct socket *so)
786 {
787 int error;
788
789 if ((so->so_state & SS_ISCONNECTED) == 0)
790 return (ENOTCONN);
791 if (so->so_state & SS_ISDISCONNECTING)
792 return (EALREADY);
793 error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so);
794 return (error);
795 }
796
797 #ifdef ZERO_COPY_SOCKETS
798 struct so_zerocopy_stats{
799 int size_ok;
800 int align_ok;
801 int found_ifp;
802 };
803 struct so_zerocopy_stats so_zerocp_stats = {0,0,0};
804 #include <netinet/in.h>
805 #include <net/route.h>
806 #include <netinet/in_pcb.h>
807 #include <vm/vm.h>
808 #include <vm/vm_page.h>
809 #include <vm/vm_object.h>
810
811 /*
812 * sosend_copyin() is only used if zero copy sockets are enabled. Otherwise
813 * sosend_dgram() and sosend_generic() use m_uiotombuf().
814 *
815 * sosend_copyin() accepts a uio and prepares an mbuf chain holding part or
816 * all of the data referenced by the uio. If desired, it uses zero-copy.
817 * *space will be updated to reflect data copied in.
818 *
819 * NB: If atomic I/O is requested, the caller must already have checked that
820 * space can hold resid bytes.
821 *
822 * NB: In the event of an error, the caller may need to free the partial
823 * chain pointed to by *mpp. The contents of both *uio and *space may be
824 * modified even in the case of an error.
825 */
826 static int
827 sosend_copyin(struct uio *uio, struct mbuf **retmp, int atomic, long *space,
828 int flags)
829 {
830 struct mbuf *m, **mp, *top;
831 long len, resid;
832 int error;
833 #ifdef ZERO_COPY_SOCKETS
834 int cow_send;
835 #endif
836
837 *retmp = top = NULL;
838 mp = ⊤
839 len = 0;
840 resid = uio->uio_resid;
841 error = 0;
842 do {
843 #ifdef ZERO_COPY_SOCKETS
844 cow_send = 0;
845 #endif /* ZERO_COPY_SOCKETS */
846 if (resid >= MINCLSIZE) {
847 #ifdef ZERO_COPY_SOCKETS
848 if (top == NULL) {
849 m = m_gethdr(M_WAITOK, MT_DATA);
850 m->m_pkthdr.len = 0;
851 m->m_pkthdr.rcvif = NULL;
852 } else
853 m = m_get(M_WAITOK, MT_DATA);
854 if (so_zero_copy_send &&
855 resid>=PAGE_SIZE &&
856 *space>=PAGE_SIZE &&
857 uio->uio_iov->iov_len>=PAGE_SIZE) {
858 so_zerocp_stats.size_ok++;
859 so_zerocp_stats.align_ok++;
860 cow_send = socow_setup(m, uio);
861 len = cow_send;
862 }
863 if (!cow_send) {
864 m_clget(m, M_WAITOK);
865 len = min(min(MCLBYTES, resid), *space);
866 }
867 #else /* ZERO_COPY_SOCKETS */
868 if (top == NULL) {
869 m = m_getcl(M_TRYWAIT, MT_DATA, M_PKTHDR);
870 m->m_pkthdr.len = 0;
871 m->m_pkthdr.rcvif = NULL;
872 } else
873 m = m_getcl(M_TRYWAIT, MT_DATA, 0);
874 len = min(min(MCLBYTES, resid), *space);
875 #endif /* ZERO_COPY_SOCKETS */
876 } else {
877 if (top == NULL) {
878 m = m_gethdr(M_TRYWAIT, MT_DATA);
879 m->m_pkthdr.len = 0;
880 m->m_pkthdr.rcvif = NULL;
881
882 len = min(min(MHLEN, resid), *space);
883 /*
884 * For datagram protocols, leave room
885 * for protocol headers in first mbuf.
886 */
887 if (atomic && m && len < MHLEN)
888 MH_ALIGN(m, len);
889 } else {
890 m = m_get(M_TRYWAIT, MT_DATA);
891 len = min(min(MLEN, resid), *space);
892 }
893 }
894 if (m == NULL) {
895 error = ENOBUFS;
896 goto out;
897 }
898
899 *space -= len;
900 #ifdef ZERO_COPY_SOCKETS
901 if (cow_send)
902 error = 0;
903 else
904 #endif /* ZERO_COPY_SOCKETS */
905 error = uiomove(mtod(m, void *), (int)len, uio);
906 resid = uio->uio_resid;
907 m->m_len = len;
908 *mp = m;
909 top->m_pkthdr.len += len;
910 if (error)
911 goto out;
912 mp = &m->m_next;
913 if (resid <= 0) {
914 if (flags & MSG_EOR)
915 top->m_flags |= M_EOR;
916 break;
917 }
918 } while (*space > 0 && atomic);
919 out:
920 *retmp = top;
921 return (error);
922 }
923 #endif /*ZERO_COPY_SOCKETS*/
924
925 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? 0 : SBL_WAIT)
926
927 int
928 sosend_dgram(struct socket *so, struct sockaddr *addr, struct uio *uio,
929 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
930 {
931 long space, resid;
932 int clen = 0, error, dontroute;
933 #ifdef ZERO_COPY_SOCKETS
934 int atomic = sosendallatonce(so) || top;
935 #endif
936
937 KASSERT(so->so_type == SOCK_DGRAM, ("sodgram_send: !SOCK_DGRAM"));
938 KASSERT(so->so_proto->pr_flags & PR_ATOMIC,
939 ("sodgram_send: !PR_ATOMIC"));
940
941 if (uio != NULL)
942 resid = uio->uio_resid;
943 else
944 resid = top->m_pkthdr.len;
945 /*
946 * In theory resid should be unsigned. However, space must be
947 * signed, as it might be less than 0 if we over-committed, and we
948 * must use a signed comparison of space and resid. On the other
949 * hand, a negative resid causes us to loop sending 0-length
950 * segments to the protocol.
951 *
952 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
953 * type sockets since that's an error.
954 */
955 if (resid < 0) {
956 error = EINVAL;
957 goto out;
958 }
959
960 dontroute =
961 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0;
962 if (td != NULL)
963 td->td_ru.ru_msgsnd++;
964 if (control != NULL)
965 clen = control->m_len;
966
967 SOCKBUF_LOCK(&so->so_snd);
968 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
969 SOCKBUF_UNLOCK(&so->so_snd);
970 error = EPIPE;
971 goto out;
972 }
973 if (so->so_error) {
974 error = so->so_error;
975 so->so_error = 0;
976 SOCKBUF_UNLOCK(&so->so_snd);
977 goto out;
978 }
979 if ((so->so_state & SS_ISCONNECTED) == 0) {
980 /*
981 * `sendto' and `sendmsg' is allowed on a connection-based
982 * socket if it supports implied connect. Return ENOTCONN if
983 * not connected and no address is supplied.
984 */
985 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
986 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
987 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
988 !(resid == 0 && clen != 0)) {
989 SOCKBUF_UNLOCK(&so->so_snd);
990 error = ENOTCONN;
991 goto out;
992 }
993 } else if (addr == NULL) {
994 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
995 error = ENOTCONN;
996 else
997 error = EDESTADDRREQ;
998 SOCKBUF_UNLOCK(&so->so_snd);
999 goto out;
1000 }
1001 }
1002
1003 /*
1004 * Do we need MSG_OOB support in SOCK_DGRAM? Signs here may be a
1005 * problem and need fixing.
1006 */
1007 space = sbspace(&so->so_snd);
1008 if (flags & MSG_OOB)
1009 space += 1024;
1010 space -= clen;
1011 SOCKBUF_UNLOCK(&so->so_snd);
1012 if (resid > space) {
1013 error = EMSGSIZE;
1014 goto out;
1015 }
1016 if (uio == NULL) {
1017 resid = 0;
1018 if (flags & MSG_EOR)
1019 top->m_flags |= M_EOR;
1020 } else {
1021 #ifdef ZERO_COPY_SOCKETS
1022 error = sosend_copyin(uio, &top, atomic, &space, flags);
1023 if (error)
1024 goto out;
1025 #else
1026 /*
1027 * Copy the data from userland into a mbuf chain.
1028 * If no data is to be copied in, a single empty mbuf
1029 * is returned.
1030 */
1031 top = m_uiotombuf(uio, M_WAITOK, space, max_hdr,
1032 (M_PKTHDR | ((flags & MSG_EOR) ? M_EOR : 0)));
1033 if (top == NULL) {
1034 error = EFAULT; /* only possible error */
1035 goto out;
1036 }
1037 space -= resid - uio->uio_resid;
1038 #endif
1039 resid = uio->uio_resid;
1040 }
1041 KASSERT(resid == 0, ("sosend_dgram: resid != 0"));
1042 /*
1043 * XXXRW: Frobbing SO_DONTROUTE here is even worse without sblock
1044 * than with.
1045 */
1046 if (dontroute) {
1047 SOCK_LOCK(so);
1048 so->so_options |= SO_DONTROUTE;
1049 SOCK_UNLOCK(so);
1050 }
1051 /*
1052 * XXX all the SBS_CANTSENDMORE checks previously done could be out
1053 * of date. We could have recieved a reset packet in an interrupt or
1054 * maybe we slept while doing page faults in uiomove() etc. We could
1055 * probably recheck again inside the locking protection here, but
1056 * there are probably other places that this also happens. We must
1057 * rethink this.
1058 */
1059 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1060 (flags & MSG_OOB) ? PRUS_OOB :
1061 /*
1062 * If the user set MSG_EOF, the protocol understands this flag and
1063 * nothing left to send then use PRU_SEND_EOF instead of PRU_SEND.
1064 */
1065 ((flags & MSG_EOF) &&
1066 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1067 (resid <= 0)) ?
1068 PRUS_EOF :
1069 /* If there is more to send set PRUS_MORETOCOME */
1070 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1071 top, addr, control, td);
1072 if (dontroute) {
1073 SOCK_LOCK(so);
1074 so->so_options &= ~SO_DONTROUTE;
1075 SOCK_UNLOCK(so);
1076 }
1077 clen = 0;
1078 control = NULL;
1079 top = NULL;
1080 out:
1081 if (top != NULL)
1082 m_freem(top);
1083 if (control != NULL)
1084 m_freem(control);
1085 return (error);
1086 }
1087
1088 /*
1089 * Send on a socket. If send must go all at once and message is larger than
1090 * send buffering, then hard error. Lock against other senders. If must go
1091 * all at once and not enough room now, then inform user that this would
1092 * block and do nothing. Otherwise, if nonblocking, send as much as
1093 * possible. The data to be sent is described by "uio" if nonzero, otherwise
1094 * by the mbuf chain "top" (which must be null if uio is not). Data provided
1095 * in mbuf chain must be small enough to send all at once.
1096 *
1097 * Returns nonzero on error, timeout or signal; callers must check for short
1098 * counts if EINTR/ERESTART are returned. Data and control buffers are freed
1099 * on return.
1100 */
1101 int
1102 sosend_generic(struct socket *so, struct sockaddr *addr, struct uio *uio,
1103 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1104 {
1105 long space, resid;
1106 int clen = 0, error, dontroute;
1107 int atomic = sosendallatonce(so) || top;
1108
1109 if (uio != NULL)
1110 resid = uio->uio_resid;
1111 else
1112 resid = top->m_pkthdr.len;
1113 /*
1114 * In theory resid should be unsigned. However, space must be
1115 * signed, as it might be less than 0 if we over-committed, and we
1116 * must use a signed comparison of space and resid. On the other
1117 * hand, a negative resid causes us to loop sending 0-length
1118 * segments to the protocol.
1119 *
1120 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
1121 * type sockets since that's an error.
1122 */
1123 if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
1124 error = EINVAL;
1125 goto out;
1126 }
1127
1128 dontroute =
1129 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
1130 (so->so_proto->pr_flags & PR_ATOMIC);
1131 if (td != NULL)
1132 td->td_ru.ru_msgsnd++;
1133 if (control != NULL)
1134 clen = control->m_len;
1135
1136 error = sblock(&so->so_snd, SBLOCKWAIT(flags));
1137 if (error)
1138 goto out;
1139
1140 restart:
1141 do {
1142 SOCKBUF_LOCK(&so->so_snd);
1143 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1144 SOCKBUF_UNLOCK(&so->so_snd);
1145 error = EPIPE;
1146 goto release;
1147 }
1148 if (so->so_error) {
1149 error = so->so_error;
1150 so->so_error = 0;
1151 SOCKBUF_UNLOCK(&so->so_snd);
1152 goto release;
1153 }
1154 if ((so->so_state & SS_ISCONNECTED) == 0) {
1155 /*
1156 * `sendto' and `sendmsg' is allowed on a connection-
1157 * based socket if it supports implied connect.
1158 * Return ENOTCONN if not connected and no address is
1159 * supplied.
1160 */
1161 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
1162 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
1163 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1164 !(resid == 0 && clen != 0)) {
1165 SOCKBUF_UNLOCK(&so->so_snd);
1166 error = ENOTCONN;
1167 goto release;
1168 }
1169 } else if (addr == NULL) {
1170 SOCKBUF_UNLOCK(&so->so_snd);
1171 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
1172 error = ENOTCONN;
1173 else
1174 error = EDESTADDRREQ;
1175 goto release;
1176 }
1177 }
1178 space = sbspace(&so->so_snd);
1179 if (flags & MSG_OOB)
1180 space += 1024;
1181 if ((atomic && resid > so->so_snd.sb_hiwat) ||
1182 clen > so->so_snd.sb_hiwat) {
1183 SOCKBUF_UNLOCK(&so->so_snd);
1184 error = EMSGSIZE;
1185 goto release;
1186 }
1187 if (space < resid + clen &&
1188 (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1189 if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1190 SOCKBUF_UNLOCK(&so->so_snd);
1191 error = EWOULDBLOCK;
1192 goto release;
1193 }
1194 error = sbwait(&so->so_snd);
1195 SOCKBUF_UNLOCK(&so->so_snd);
1196 if (error)
1197 goto release;
1198 goto restart;
1199 }
1200 SOCKBUF_UNLOCK(&so->so_snd);
1201 space -= clen;
1202 do {
1203 if (uio == NULL) {
1204 resid = 0;
1205 if (flags & MSG_EOR)
1206 top->m_flags |= M_EOR;
1207 } else {
1208 #ifdef ZERO_COPY_SOCKETS
1209 error = sosend_copyin(uio, &top, atomic,
1210 &space, flags);
1211 if (error != 0)
1212 goto release;
1213 #else
1214 /*
1215 * Copy the data from userland into a mbuf
1216 * chain. If no data is to be copied in,
1217 * a single empty mbuf is returned.
1218 */
1219 top = m_uiotombuf(uio, M_WAITOK, space,
1220 (atomic ? max_hdr : 0),
1221 (atomic ? M_PKTHDR : 0) |
1222 ((flags & MSG_EOR) ? M_EOR : 0));
1223 if (top == NULL) {
1224 error = EFAULT; /* only possible error */
1225 goto release;
1226 }
1227 space -= resid - uio->uio_resid;
1228 #endif
1229 resid = uio->uio_resid;
1230 }
1231 if (dontroute) {
1232 SOCK_LOCK(so);
1233 so->so_options |= SO_DONTROUTE;
1234 SOCK_UNLOCK(so);
1235 }
1236 /*
1237 * XXX all the SBS_CANTSENDMORE checks previously
1238 * done could be out of date. We could have recieved
1239 * a reset packet in an interrupt or maybe we slept
1240 * while doing page faults in uiomove() etc. We
1241 * could probably recheck again inside the locking
1242 * protection here, but there are probably other
1243 * places that this also happens. We must rethink
1244 * this.
1245 */
1246 error = (*so->so_proto->pr_usrreqs->pru_send)(so,
1247 (flags & MSG_OOB) ? PRUS_OOB :
1248 /*
1249 * If the user set MSG_EOF, the protocol understands
1250 * this flag and nothing left to send then use
1251 * PRU_SEND_EOF instead of PRU_SEND.
1252 */
1253 ((flags & MSG_EOF) &&
1254 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
1255 (resid <= 0)) ?
1256 PRUS_EOF :
1257 /* If there is more to send set PRUS_MORETOCOME. */
1258 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
1259 top, addr, control, td);
1260 if (dontroute) {
1261 SOCK_LOCK(so);
1262 so->so_options &= ~SO_DONTROUTE;
1263 SOCK_UNLOCK(so);
1264 }
1265 clen = 0;
1266 control = NULL;
1267 top = NULL;
1268 if (error)
1269 goto release;
1270 } while (resid && space > 0);
1271 } while (resid);
1272
1273 release:
1274 sbunlock(&so->so_snd);
1275 out:
1276 if (top != NULL)
1277 m_freem(top);
1278 if (control != NULL)
1279 m_freem(control);
1280 return (error);
1281 }
1282
1283 int
1284 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
1285 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
1286 {
1287
1288 return (so->so_proto->pr_usrreqs->pru_sosend(so, addr, uio, top,
1289 control, flags, td));
1290 }
1291
1292 /*
1293 * The part of soreceive() that implements reading non-inline out-of-band
1294 * data from a socket. For more complete comments, see soreceive(), from
1295 * which this code originated.
1296 *
1297 * Note that soreceive_rcvoob(), unlike the remainder of soreceive(), is
1298 * unable to return an mbuf chain to the caller.
1299 */
1300 static int
1301 soreceive_rcvoob(struct socket *so, struct uio *uio, int flags)
1302 {
1303 struct protosw *pr = so->so_proto;
1304 struct mbuf *m;
1305 int error;
1306
1307 KASSERT(flags & MSG_OOB, ("soreceive_rcvoob: (flags & MSG_OOB) == 0"));
1308
1309 m = m_get(M_TRYWAIT, MT_DATA);
1310 if (m == NULL)
1311 return (ENOBUFS);
1312 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK);
1313 if (error)
1314 goto bad;
1315 do {
1316 #ifdef ZERO_COPY_SOCKETS
1317 if (so_zero_copy_receive) {
1318 int disposable;
1319
1320 if ((m->m_flags & M_EXT)
1321 && (m->m_ext.ext_type == EXT_DISPOSABLE))
1322 disposable = 1;
1323 else
1324 disposable = 0;
1325
1326 error = uiomoveco(mtod(m, void *),
1327 min(uio->uio_resid, m->m_len),
1328 uio, disposable);
1329 } else
1330 #endif /* ZERO_COPY_SOCKETS */
1331 error = uiomove(mtod(m, void *),
1332 (int) min(uio->uio_resid, m->m_len), uio);
1333 m = m_free(m);
1334 } while (uio->uio_resid && error == 0 && m);
1335 bad:
1336 if (m != NULL)
1337 m_freem(m);
1338 return (error);
1339 }
1340
1341 /*
1342 * Following replacement or removal of the first mbuf on the first mbuf chain
1343 * of a socket buffer, push necessary state changes back into the socket
1344 * buffer so that other consumers see the values consistently. 'nextrecord'
1345 * is the callers locally stored value of the original value of
1346 * sb->sb_mb->m_nextpkt which must be restored when the lead mbuf changes.
1347 * NOTE: 'nextrecord' may be NULL.
1348 */
1349 static __inline void
1350 sockbuf_pushsync(struct sockbuf *sb, struct mbuf *nextrecord)
1351 {
1352
1353 SOCKBUF_LOCK_ASSERT(sb);
1354 /*
1355 * First, update for the new value of nextrecord. If necessary, make
1356 * it the first record.
1357 */
1358 if (sb->sb_mb != NULL)
1359 sb->sb_mb->m_nextpkt = nextrecord;
1360 else
1361 sb->sb_mb = nextrecord;
1362
1363 /*
1364 * Now update any dependent socket buffer fields to reflect the new
1365 * state. This is an expanded inline of SB_EMPTY_FIXUP(), with the
1366 * addition of a second clause that takes care of the case where
1367 * sb_mb has been updated, but remains the last record.
1368 */
1369 if (sb->sb_mb == NULL) {
1370 sb->sb_mbtail = NULL;
1371 sb->sb_lastrecord = NULL;
1372 } else if (sb->sb_mb->m_nextpkt == NULL)
1373 sb->sb_lastrecord = sb->sb_mb;
1374 }
1375
1376
1377 /*
1378 * Implement receive operations on a socket. We depend on the way that
1379 * records are added to the sockbuf by sbappend. In particular, each record
1380 * (mbufs linked through m_next) must begin with an address if the protocol
1381 * so specifies, followed by an optional mbuf or mbufs containing ancillary
1382 * data, and then zero or more mbufs of data. In order to allow parallelism
1383 * between network receive and copying to user space, as well as avoid
1384 * sleeping with a mutex held, we release the socket buffer mutex during the
1385 * user space copy. Although the sockbuf is locked, new data may still be
1386 * appended, and thus we must maintain consistency of the sockbuf during that
1387 * time.
1388 *
1389 * The caller may receive the data as a single mbuf chain by supplying an
1390 * mbuf **mp0 for use in returning the chain. The uio is then used only for
1391 * the count in uio_resid.
1392 */
1393 int
1394 soreceive_generic(struct socket *so, struct sockaddr **psa, struct uio *uio,
1395 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1396 {
1397 struct mbuf *m, **mp;
1398 int flags, len, error, offset;
1399 struct protosw *pr = so->so_proto;
1400 struct mbuf *nextrecord;
1401 int moff, type = 0;
1402 int orig_resid = uio->uio_resid;
1403
1404 mp = mp0;
1405 if (psa != NULL)
1406 *psa = NULL;
1407 if (controlp != NULL)
1408 *controlp = NULL;
1409 if (flagsp != NULL)
1410 flags = *flagsp &~ MSG_EOR;
1411 else
1412 flags = 0;
1413 if (flags & MSG_OOB)
1414 return (soreceive_rcvoob(so, uio, flags));
1415 if (mp != NULL)
1416 *mp = NULL;
1417 if ((pr->pr_flags & PR_WANTRCVD) && (so->so_state & SS_ISCONFIRMING)
1418 && uio->uio_resid)
1419 (*pr->pr_usrreqs->pru_rcvd)(so, 0);
1420
1421 error = sblock(&so->so_rcv, SBLOCKWAIT(flags));
1422 if (error)
1423 return (error);
1424
1425 restart:
1426 SOCKBUF_LOCK(&so->so_rcv);
1427 m = so->so_rcv.sb_mb;
1428 /*
1429 * If we have less data than requested, block awaiting more (subject
1430 * to any timeout) if:
1431 * 1. the current count is less than the low water mark, or
1432 * 2. MSG_WAITALL is set, and it is possible to do the entire
1433 * receive operation at once if we block (resid <= hiwat).
1434 * 3. MSG_DONTWAIT is not set
1435 * If MSG_WAITALL is set but resid is larger than the receive buffer,
1436 * we have to do the receive in sections, and thus risk returning a
1437 * short count if a timeout or signal occurs after we start.
1438 */
1439 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
1440 so->so_rcv.sb_cc < uio->uio_resid) &&
1441 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1442 ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1443 m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) {
1444 KASSERT(m != NULL || !so->so_rcv.sb_cc,
1445 ("receive: m == %p so->so_rcv.sb_cc == %u",
1446 m, so->so_rcv.sb_cc));
1447 if (so->so_error) {
1448 if (m != NULL)
1449 goto dontblock;
1450 error = so->so_error;
1451 if ((flags & MSG_PEEK) == 0)
1452 so->so_error = 0;
1453 SOCKBUF_UNLOCK(&so->so_rcv);
1454 goto release;
1455 }
1456 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1457 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
1458 if (m == NULL) {
1459 SOCKBUF_UNLOCK(&so->so_rcv);
1460 goto release;
1461 } else
1462 goto dontblock;
1463 }
1464 for (; m != NULL; m = m->m_next)
1465 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1466 m = so->so_rcv.sb_mb;
1467 goto dontblock;
1468 }
1469 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1470 (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1471 SOCKBUF_UNLOCK(&so->so_rcv);
1472 error = ENOTCONN;
1473 goto release;
1474 }
1475 if (uio->uio_resid == 0) {
1476 SOCKBUF_UNLOCK(&so->so_rcv);
1477 goto release;
1478 }
1479 if ((so->so_state & SS_NBIO) ||
1480 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1481 SOCKBUF_UNLOCK(&so->so_rcv);
1482 error = EWOULDBLOCK;
1483 goto release;
1484 }
1485 SBLASTRECORDCHK(&so->so_rcv);
1486 SBLASTMBUFCHK(&so->so_rcv);
1487 error = sbwait(&so->so_rcv);
1488 SOCKBUF_UNLOCK(&so->so_rcv);
1489 if (error)
1490 goto release;
1491 goto restart;
1492 }
1493 dontblock:
1494 /*
1495 * From this point onward, we maintain 'nextrecord' as a cache of the
1496 * pointer to the next record in the socket buffer. We must keep the
1497 * various socket buffer pointers and local stack versions of the
1498 * pointers in sync, pushing out modifications before dropping the
1499 * socket buffer mutex, and re-reading them when picking it up.
1500 *
1501 * Otherwise, we will race with the network stack appending new data
1502 * or records onto the socket buffer by using inconsistent/stale
1503 * versions of the field, possibly resulting in socket buffer
1504 * corruption.
1505 *
1506 * By holding the high-level sblock(), we prevent simultaneous
1507 * readers from pulling off the front of the socket buffer.
1508 */
1509 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1510 if (uio->uio_td)
1511 uio->uio_td->td_ru.ru_msgrcv++;
1512 KASSERT(m == so->so_rcv.sb_mb, ("soreceive: m != so->so_rcv.sb_mb"));
1513 SBLASTRECORDCHK(&so->so_rcv);
1514 SBLASTMBUFCHK(&so->so_rcv);
1515 nextrecord = m->m_nextpkt;
1516 if (pr->pr_flags & PR_ADDR) {
1517 KASSERT(m->m_type == MT_SONAME,
1518 ("m->m_type == %d", m->m_type));
1519 orig_resid = 0;
1520 if (psa != NULL)
1521 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
1522 M_NOWAIT);
1523 if (flags & MSG_PEEK) {
1524 m = m->m_next;
1525 } else {
1526 sbfree(&so->so_rcv, m);
1527 so->so_rcv.sb_mb = m_free(m);
1528 m = so->so_rcv.sb_mb;
1529 sockbuf_pushsync(&so->so_rcv, nextrecord);
1530 }
1531 }
1532
1533 /*
1534 * Process one or more MT_CONTROL mbufs present before any data mbufs
1535 * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1536 * just copy the data; if !MSG_PEEK, we call into the protocol to
1537 * perform externalization (or freeing if controlp == NULL).
1538 */
1539 if (m != NULL && m->m_type == MT_CONTROL) {
1540 struct mbuf *cm = NULL, *cmn;
1541 struct mbuf **cme = &cm;
1542
1543 do {
1544 if (flags & MSG_PEEK) {
1545 if (controlp != NULL) {
1546 *controlp = m_copy(m, 0, m->m_len);
1547 controlp = &(*controlp)->m_next;
1548 }
1549 m = m->m_next;
1550 } else {
1551 sbfree(&so->so_rcv, m);
1552 so->so_rcv.sb_mb = m->m_next;
1553 m->m_next = NULL;
1554 *cme = m;
1555 cme = &(*cme)->m_next;
1556 m = so->so_rcv.sb_mb;
1557 }
1558 } while (m != NULL && m->m_type == MT_CONTROL);
1559 if ((flags & MSG_PEEK) == 0)
1560 sockbuf_pushsync(&so->so_rcv, nextrecord);
1561 while (cm != NULL) {
1562 cmn = cm->m_next;
1563 cm->m_next = NULL;
1564 if (pr->pr_domain->dom_externalize != NULL) {
1565 SOCKBUF_UNLOCK(&so->so_rcv);
1566 error = (*pr->pr_domain->dom_externalize)
1567 (cm, controlp);
1568 SOCKBUF_LOCK(&so->so_rcv);
1569 } else if (controlp != NULL)
1570 *controlp = cm;
1571 else
1572 m_freem(cm);
1573 if (controlp != NULL) {
1574 orig_resid = 0;
1575 while (*controlp != NULL)
1576 controlp = &(*controlp)->m_next;
1577 }
1578 cm = cmn;
1579 }
1580 if (m != NULL)
1581 nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1582 else
1583 nextrecord = so->so_rcv.sb_mb;
1584 orig_resid = 0;
1585 }
1586 if (m != NULL) {
1587 if ((flags & MSG_PEEK) == 0) {
1588 KASSERT(m->m_nextpkt == nextrecord,
1589 ("soreceive: post-control, nextrecord !sync"));
1590 if (nextrecord == NULL) {
1591 KASSERT(so->so_rcv.sb_mb == m,
1592 ("soreceive: post-control, sb_mb!=m"));
1593 KASSERT(so->so_rcv.sb_lastrecord == m,
1594 ("soreceive: post-control, lastrecord!=m"));
1595 }
1596 }
1597 type = m->m_type;
1598 if (type == MT_OOBDATA)
1599 flags |= MSG_OOB;
1600 } else {
1601 if ((flags & MSG_PEEK) == 0) {
1602 KASSERT(so->so_rcv.sb_mb == nextrecord,
1603 ("soreceive: sb_mb != nextrecord"));
1604 if (so->so_rcv.sb_mb == NULL) {
1605 KASSERT(so->so_rcv.sb_lastrecord == NULL,
1606 ("soreceive: sb_lastercord != NULL"));
1607 }
1608 }
1609 }
1610 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1611 SBLASTRECORDCHK(&so->so_rcv);
1612 SBLASTMBUFCHK(&so->so_rcv);
1613
1614 /*
1615 * Now continue to read any data mbufs off of the head of the socket
1616 * buffer until the read request is satisfied. Note that 'type' is
1617 * used to store the type of any mbuf reads that have happened so far
1618 * such that soreceive() can stop reading if the type changes, which
1619 * causes soreceive() to return only one of regular data and inline
1620 * out-of-band data in a single socket receive operation.
1621 */
1622 moff = 0;
1623 offset = 0;
1624 while (m != NULL && uio->uio_resid > 0 && error == 0) {
1625 /*
1626 * If the type of mbuf has changed since the last mbuf
1627 * examined ('type'), end the receive operation.
1628 */
1629 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1630 if (m->m_type == MT_OOBDATA) {
1631 if (type != MT_OOBDATA)
1632 break;
1633 } else if (type == MT_OOBDATA)
1634 break;
1635 else
1636 KASSERT(m->m_type == MT_DATA,
1637 ("m->m_type == %d", m->m_type));
1638 so->so_rcv.sb_state &= ~SBS_RCVATMARK;
1639 len = uio->uio_resid;
1640 if (so->so_oobmark && len > so->so_oobmark - offset)
1641 len = so->so_oobmark - offset;
1642 if (len > m->m_len - moff)
1643 len = m->m_len - moff;
1644 /*
1645 * If mp is set, just pass back the mbufs. Otherwise copy
1646 * them out via the uio, then free. Sockbuf must be
1647 * consistent here (points to current mbuf, it points to next
1648 * record) when we drop priority; we must note any additions
1649 * to the sockbuf when we block interrupts again.
1650 */
1651 if (mp == NULL) {
1652 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1653 SBLASTRECORDCHK(&so->so_rcv);
1654 SBLASTMBUFCHK(&so->so_rcv);
1655 SOCKBUF_UNLOCK(&so->so_rcv);
1656 #ifdef ZERO_COPY_SOCKETS
1657 if (so_zero_copy_receive) {
1658 int disposable;
1659
1660 if ((m->m_flags & M_EXT)
1661 && (m->m_ext.ext_type == EXT_DISPOSABLE))
1662 disposable = 1;
1663 else
1664 disposable = 0;
1665
1666 error = uiomoveco(mtod(m, char *) + moff,
1667 (int)len, uio,
1668 disposable);
1669 } else
1670 #endif /* ZERO_COPY_SOCKETS */
1671 error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1672 SOCKBUF_LOCK(&so->so_rcv);
1673 if (error) {
1674 /*
1675 * The MT_SONAME mbuf has already been removed
1676 * from the record, so it is necessary to
1677 * remove the data mbufs, if any, to preserve
1678 * the invariant in the case of PR_ADDR that
1679 * requires MT_SONAME mbufs at the head of
1680 * each record.
1681 */
1682 if (m && pr->pr_flags & PR_ATOMIC &&
1683 ((flags & MSG_PEEK) == 0))
1684 (void)sbdroprecord_locked(&so->so_rcv);
1685 SOCKBUF_UNLOCK(&so->so_rcv);
1686 goto release;
1687 }
1688 } else
1689 uio->uio_resid -= len;
1690 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1691 if (len == m->m_len - moff) {
1692 if (m->m_flags & M_EOR)
1693 flags |= MSG_EOR;
1694 if (flags & MSG_PEEK) {
1695 m = m->m_next;
1696 moff = 0;
1697 } else {
1698 nextrecord = m->m_nextpkt;
1699 sbfree(&so->so_rcv, m);
1700 if (mp != NULL) {
1701 *mp = m;
1702 mp = &m->m_next;
1703 so->so_rcv.sb_mb = m = m->m_next;
1704 *mp = NULL;
1705 } else {
1706 so->so_rcv.sb_mb = m_free(m);
1707 m = so->so_rcv.sb_mb;
1708 }
1709 sockbuf_pushsync(&so->so_rcv, nextrecord);
1710 SBLASTRECORDCHK(&so->so_rcv);
1711 SBLASTMBUFCHK(&so->so_rcv);
1712 }
1713 } else {
1714 if (flags & MSG_PEEK)
1715 moff += len;
1716 else {
1717 if (mp != NULL) {
1718 int copy_flag;
1719
1720 if (flags & MSG_DONTWAIT)
1721 copy_flag = M_DONTWAIT;
1722 else
1723 copy_flag = M_TRYWAIT;
1724 if (copy_flag == M_TRYWAIT)
1725 SOCKBUF_UNLOCK(&so->so_rcv);
1726 *mp = m_copym(m, 0, len, copy_flag);
1727 if (copy_flag == M_TRYWAIT)
1728 SOCKBUF_LOCK(&so->so_rcv);
1729 if (*mp == NULL) {
1730 /*
1731 * m_copym() couldn't
1732 * allocate an mbuf. Adjust
1733 * uio_resid back (it was
1734 * adjusted down by len
1735 * bytes, which we didn't end
1736 * up "copying" over).
1737 */
1738 uio->uio_resid += len;
1739 break;
1740 }
1741 }
1742 m->m_data += len;
1743 m->m_len -= len;
1744 so->so_rcv.sb_cc -= len;
1745 }
1746 }
1747 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1748 if (so->so_oobmark) {
1749 if ((flags & MSG_PEEK) == 0) {
1750 so->so_oobmark -= len;
1751 if (so->so_oobmark == 0) {
1752 so->so_rcv.sb_state |= SBS_RCVATMARK;
1753 break;
1754 }
1755 } else {
1756 offset += len;
1757 if (offset == so->so_oobmark)
1758 break;
1759 }
1760 }
1761 if (flags & MSG_EOR)
1762 break;
1763 /*
1764 * If the MSG_WAITALL flag is set (for non-atomic socket), we
1765 * must not quit until "uio->uio_resid == 0" or an error
1766 * termination. If a signal/timeout occurs, return with a
1767 * short count but without error. Keep sockbuf locked
1768 * against other readers.
1769 */
1770 while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1771 !sosendallatonce(so) && nextrecord == NULL) {
1772 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1773 if (so->so_error || so->so_rcv.sb_state & SBS_CANTRCVMORE)
1774 break;
1775 /*
1776 * Notify the protocol that some data has been
1777 * drained before blocking.
1778 */
1779 if (pr->pr_flags & PR_WANTRCVD) {
1780 SOCKBUF_UNLOCK(&so->so_rcv);
1781 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
1782 SOCKBUF_LOCK(&so->so_rcv);
1783 }
1784 SBLASTRECORDCHK(&so->so_rcv);
1785 SBLASTMBUFCHK(&so->so_rcv);
1786 error = sbwait(&so->so_rcv);
1787 if (error) {
1788 SOCKBUF_UNLOCK(&so->so_rcv);
1789 goto release;
1790 }
1791 m = so->so_rcv.sb_mb;
1792 if (m != NULL)
1793 nextrecord = m->m_nextpkt;
1794 }
1795 }
1796
1797 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1798 if (m != NULL && pr->pr_flags & PR_ATOMIC) {
1799 flags |= MSG_TRUNC;
1800 if ((flags & MSG_PEEK) == 0)
1801 (void) sbdroprecord_locked(&so->so_rcv);
1802 }
1803 if ((flags & MSG_PEEK) == 0) {
1804 if (m == NULL) {
1805 /*
1806 * First part is an inline SB_EMPTY_FIXUP(). Second
1807 * part makes sure sb_lastrecord is up-to-date if
1808 * there is still data in the socket buffer.
1809 */
1810 so->so_rcv.sb_mb = nextrecord;
1811 if (so->so_rcv.sb_mb == NULL) {
1812 so->so_rcv.sb_mbtail = NULL;
1813 so->so_rcv.sb_lastrecord = NULL;
1814 } else if (nextrecord->m_nextpkt == NULL)
1815 so->so_rcv.sb_lastrecord = nextrecord;
1816 }
1817 SBLASTRECORDCHK(&so->so_rcv);
1818 SBLASTMBUFCHK(&so->so_rcv);
1819 /*
1820 * If soreceive() is being done from the socket callback,
1821 * then don't need to generate ACK to peer to update window,
1822 * since ACK will be generated on return to TCP.
1823 */
1824 if (!(flags & MSG_SOCALLBCK) &&
1825 (pr->pr_flags & PR_WANTRCVD)) {
1826 SOCKBUF_UNLOCK(&so->so_rcv);
1827 (*pr->pr_usrreqs->pru_rcvd)(so, flags);
1828 SOCKBUF_LOCK(&so->so_rcv);
1829 }
1830 }
1831 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1832 if (orig_resid == uio->uio_resid && orig_resid &&
1833 (flags & MSG_EOR) == 0 && (so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0) {
1834 SOCKBUF_UNLOCK(&so->so_rcv);
1835 goto restart;
1836 }
1837 SOCKBUF_UNLOCK(&so->so_rcv);
1838
1839 if (flagsp != NULL)
1840 *flagsp |= flags;
1841 release:
1842 sbunlock(&so->so_rcv);
1843 return (error);
1844 }
1845
1846 /*
1847 * Optimized version of soreceive() for simple datagram cases from userspace.
1848 * Unlike in the stream case, we're able to drop a datagram if copyout()
1849 * fails, and because we handle datagrams atomically, we don't need to use a
1850 * sleep lock to prevent I/O interlacing.
1851 */
1852 int
1853 soreceive_dgram(struct socket *so, struct sockaddr **psa, struct uio *uio,
1854 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1855 {
1856 struct mbuf *m, *m2;
1857 int flags, len, error, offset;
1858 struct protosw *pr = so->so_proto;
1859 struct mbuf *nextrecord;
1860
1861 if (psa != NULL)
1862 *psa = NULL;
1863 if (controlp != NULL)
1864 *controlp = NULL;
1865 if (flagsp != NULL)
1866 flags = *flagsp &~ MSG_EOR;
1867 else
1868 flags = 0;
1869
1870 /*
1871 * For any complicated cases, fall back to the full
1872 * soreceive_generic().
1873 */
1874 if (mp0 != NULL || (flags & MSG_PEEK) || (flags & MSG_OOB))
1875 return (soreceive_generic(so, psa, uio, mp0, controlp,
1876 flagsp));
1877
1878 /*
1879 * Enforce restrictions on use.
1880 */
1881 KASSERT((pr->pr_flags & PR_WANTRCVD) == 0,
1882 ("soreceive_dgram: wantrcvd"));
1883 KASSERT(pr->pr_flags & PR_ATOMIC, ("soreceive_dgram: !atomic"));
1884 KASSERT((so->so_rcv.sb_state & SBS_RCVATMARK) == 0,
1885 ("soreceive_dgram: SBS_RCVATMARK"));
1886 KASSERT((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0,
1887 ("soreceive_dgram: P_CONNREQUIRED"));
1888
1889 /*
1890 * Loop blocking while waiting for a datagram.
1891 */
1892 SOCKBUF_LOCK(&so->so_rcv);
1893 while ((m = so->so_rcv.sb_mb) == NULL) {
1894 KASSERT(so->so_rcv.sb_cc == 0,
1895 ("soreceive_dgram: sb_mb NULL but sb_cc %u",
1896 so->so_rcv.sb_cc));
1897 if (so->so_error) {
1898 error = so->so_error;
1899 so->so_error = 0;
1900 SOCKBUF_UNLOCK(&so->so_rcv);
1901 return (error);
1902 }
1903 if (so->so_rcv.sb_state & SBS_CANTRCVMORE ||
1904 uio->uio_resid == 0) {
1905 SOCKBUF_UNLOCK(&so->so_rcv);
1906 return (0);
1907 }
1908 if ((so->so_state & SS_NBIO) ||
1909 (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1910 SOCKBUF_UNLOCK(&so->so_rcv);
1911 return (EWOULDBLOCK);
1912 }
1913 SBLASTRECORDCHK(&so->so_rcv);
1914 SBLASTMBUFCHK(&so->so_rcv);
1915 error = sbwait(&so->so_rcv);
1916 if (error) {
1917 SOCKBUF_UNLOCK(&so->so_rcv);
1918 return (error);
1919 }
1920 }
1921 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1922
1923 if (uio->uio_td)
1924 uio->uio_td->td_ru.ru_msgrcv++;
1925 SBLASTRECORDCHK(&so->so_rcv);
1926 SBLASTMBUFCHK(&so->so_rcv);
1927 nextrecord = m->m_nextpkt;
1928 if (nextrecord == NULL) {
1929 KASSERT(so->so_rcv.sb_lastrecord == m,
1930 ("soreceive_dgram: lastrecord != m"));
1931 }
1932
1933 KASSERT(so->so_rcv.sb_mb->m_nextpkt == nextrecord,
1934 ("soreceive_dgram: m_nextpkt != nextrecord"));
1935
1936 /*
1937 * Pull 'm' and its chain off the front of the packet queue.
1938 */
1939 so->so_rcv.sb_mb = NULL;
1940 sockbuf_pushsync(&so->so_rcv, nextrecord);
1941
1942 /*
1943 * Walk 'm's chain and free that many bytes from the socket buffer.
1944 */
1945 for (m2 = m; m2 != NULL; m2 = m2->m_next)
1946 sbfree(&so->so_rcv, m2);
1947
1948 /*
1949 * Do a few last checks before we let go of the lock.
1950 */
1951 SBLASTRECORDCHK(&so->so_rcv);
1952 SBLASTMBUFCHK(&so->so_rcv);
1953 SOCKBUF_UNLOCK(&so->so_rcv);
1954
1955 if (pr->pr_flags & PR_ADDR) {
1956 KASSERT(m->m_type == MT_SONAME,
1957 ("m->m_type == %d", m->m_type));
1958 if (psa != NULL)
1959 *psa = sodupsockaddr(mtod(m, struct sockaddr *),
1960 M_NOWAIT);
1961 m = m_free(m);
1962 }
1963 if (m == NULL) {
1964 /* XXXRW: Can this happen? */
1965 return (0);
1966 }
1967
1968 /*
1969 * Packet to copyout() is now in 'm' and it is disconnected from the
1970 * queue.
1971 *
1972 * Process one or more MT_CONTROL mbufs present before any data mbufs
1973 * in the first mbuf chain on the socket buffer. We call into the
1974 * protocol to perform externalization (or freeing if controlp ==
1975 * NULL).
1976 */
1977 if (m->m_type == MT_CONTROL) {
1978 struct mbuf *cm = NULL, *cmn;
1979 struct mbuf **cme = &cm;
1980
1981 do {
1982 m2 = m->m_next;
1983 m->m_next = NULL;
1984 *cme = m;
1985 cme = &(*cme)->m_next;
1986 m = m2;
1987 } while (m != NULL && m->m_type == MT_CONTROL);
1988 while (cm != NULL) {
1989 cmn = cm->m_next;
1990 cm->m_next = NULL;
1991 if (pr->pr_domain->dom_externalize != NULL) {
1992 error = (*pr->pr_domain->dom_externalize)
1993 (cm, controlp);
1994 } else if (controlp != NULL)
1995 *controlp = cm;
1996 else
1997 m_freem(cm);
1998 if (controlp != NULL) {
1999 while (*controlp != NULL)
2000 controlp = &(*controlp)->m_next;
2001 }
2002 cm = cmn;
2003 }
2004 }
2005 KASSERT(m->m_type == MT_DATA, ("soreceive_dgram: !data"));
2006
2007 offset = 0;
2008 while (m != NULL && uio->uio_resid > 0) {
2009 len = uio->uio_resid;
2010 if (len > m->m_len)
2011 len = m->m_len;
2012 error = uiomove(mtod(m, char *), (int)len, uio);
2013 if (error) {
2014 m_freem(m);
2015 return (error);
2016 }
2017 m = m_free(m);
2018 }
2019 if (m != NULL)
2020 flags |= MSG_TRUNC;
2021 m_freem(m);
2022 if (flagsp != NULL)
2023 *flagsp |= flags;
2024 return (0);
2025 }
2026
2027 int
2028 soreceive(struct socket *so, struct sockaddr **psa, struct uio *uio,
2029 struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2030 {
2031
2032 return (so->so_proto->pr_usrreqs->pru_soreceive(so, psa, uio, mp0,
2033 controlp, flagsp));
2034 }
2035
2036 int
2037 soshutdown(struct socket *so, int how)
2038 {
2039 struct protosw *pr = so->so_proto;
2040
2041 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
2042 return (EINVAL);
2043 if (pr->pr_usrreqs->pru_flush != NULL) {
2044 (*pr->pr_usrreqs->pru_flush)(so, how);
2045 }
2046 if (how != SHUT_WR)
2047 sorflush(so);
2048 if (how != SHUT_RD)
2049 return ((*pr->pr_usrreqs->pru_shutdown)(so));
2050 return (0);
2051 }
2052
2053 void
2054 sorflush(struct socket *so)
2055 {
2056 struct sockbuf *sb = &so->so_rcv;
2057 struct protosw *pr = so->so_proto;
2058 struct sockbuf asb;
2059
2060 /*
2061 * In order to avoid calling dom_dispose with the socket buffer mutex
2062 * held, and in order to generally avoid holding the lock for a long
2063 * time, we make a copy of the socket buffer and clear the original
2064 * (except locks, state). The new socket buffer copy won't have
2065 * initialized locks so we can only call routines that won't use or
2066 * assert those locks.
2067 *
2068 * Dislodge threads currently blocked in receive and wait to acquire
2069 * a lock against other simultaneous readers before clearing the
2070 * socket buffer. Don't let our acquire be interrupted by a signal
2071 * despite any existing socket disposition on interruptable waiting.
2072 */
2073 socantrcvmore(so);
2074 (void) sblock(sb, SBL_WAIT | SBL_NOINTR);
2075
2076 /*
2077 * Invalidate/clear most of the sockbuf structure, but leave selinfo
2078 * and mutex data unchanged.
2079 */
2080 SOCKBUF_LOCK(sb);
2081 bzero(&asb, offsetof(struct sockbuf, sb_startzero));
2082 bcopy(&sb->sb_startzero, &asb.sb_startzero,
2083 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
2084 bzero(&sb->sb_startzero,
2085 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
2086 SOCKBUF_UNLOCK(sb);
2087 sbunlock(sb);
2088
2089 /*
2090 * Dispose of special rights and flush the socket buffer. Don't call
2091 * any unsafe routines (that rely on locks being initialized) on asb.
2092 */
2093 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
2094 (*pr->pr_domain->dom_dispose)(asb.sb_mb);
2095 sbrelease_internal(&asb, so);
2096 }
2097
2098 /*
2099 * Perhaps this routine, and sooptcopyout(), below, ought to come in an
2100 * additional variant to handle the case where the option value needs to be
2101 * some kind of integer, but not a specific size. In addition to their use
2102 * here, these functions are also called by the protocol-level pr_ctloutput()
2103 * routines.
2104 */
2105 int
2106 sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
2107 {
2108 size_t valsize;
2109
2110 /*
2111 * If the user gives us more than we wanted, we ignore it, but if we
2112 * don't get the minimum length the caller wants, we return EINVAL.
2113 * On success, sopt->sopt_valsize is set to however much we actually
2114 * retrieved.
2115 */
2116 if ((valsize = sopt->sopt_valsize) < minlen)
2117 return EINVAL;
2118 if (valsize > len)
2119 sopt->sopt_valsize = valsize = len;
2120
2121 if (sopt->sopt_td != NULL)
2122 return (copyin(sopt->sopt_val, buf, valsize));
2123
2124 bcopy(sopt->sopt_val, buf, valsize);
2125 return (0);
2126 }
2127
2128 /*
2129 * Kernel version of setsockopt(2).
2130 *
2131 * XXX: optlen is size_t, not socklen_t
2132 */
2133 int
2134 so_setsockopt(struct socket *so, int level, int optname, void *optval,
2135 size_t optlen)
2136 {
2137 struct sockopt sopt;
2138
2139 sopt.sopt_level = level;
2140 sopt.sopt_name = optname;
2141 sopt.sopt_dir = SOPT_SET;
2142 sopt.sopt_val = optval;
2143 sopt.sopt_valsize = optlen;
2144 sopt.sopt_td = NULL;
2145 return (sosetopt(so, &sopt));
2146 }
2147
2148 int
2149 sosetopt(struct socket *so, struct sockopt *sopt)
2150 {
2151 int error, optval;
2152 struct linger l;
2153 struct timeval tv;
2154 u_long val;
2155 #ifdef MAC
2156 struct mac extmac;
2157 #endif
2158
2159 error = 0;
2160 if (sopt->sopt_level != SOL_SOCKET) {
2161 if (so->so_proto && so->so_proto->pr_ctloutput)
2162 return ((*so->so_proto->pr_ctloutput)
2163 (so, sopt));
2164 error = ENOPROTOOPT;
2165 } else {
2166 switch (sopt->sopt_name) {
2167 #ifdef INET
2168 case SO_ACCEPTFILTER:
2169 error = do_setopt_accept_filter(so, sopt);
2170 if (error)
2171 goto bad;
2172 break;
2173 #endif
2174 case SO_LINGER:
2175 error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
2176 if (error)
2177 goto bad;
2178
2179 SOCK_LOCK(so);
2180 so->so_linger = l.l_linger;
2181 if (l.l_onoff)
2182 so->so_options |= SO_LINGER;
2183 else
2184 so->so_options &= ~SO_LINGER;
2185 SOCK_UNLOCK(so);
2186 break;
2187
2188 case SO_DEBUG:
2189 case SO_KEEPALIVE:
2190 case SO_DONTROUTE:
2191 case SO_USELOOPBACK:
2192 case SO_BROADCAST:
2193 case SO_REUSEADDR:
2194 case SO_REUSEPORT:
2195 case SO_OOBINLINE:
2196 case SO_TIMESTAMP:
2197 case SO_BINTIME:
2198 case SO_NOSIGPIPE:
2199 error = sooptcopyin(sopt, &optval, sizeof optval,
2200 sizeof optval);
2201 if (error)
2202 goto bad;
2203 SOCK_LOCK(so);
2204 if (optval)
2205 so->so_options |= sopt->sopt_name;
2206 else
2207 so->so_options &= ~sopt->sopt_name;
2208 SOCK_UNLOCK(so);
2209 break;
2210
2211 case SO_SETFIB:
2212 error = sooptcopyin(sopt, &optval, sizeof optval,
2213 sizeof optval);
2214 if (optval < 1 || optval > rt_numfibs) {
2215 error = EINVAL;
2216 goto bad;
2217 }
2218 if ((so->so_proto->pr_domain->dom_family == PF_INET) ||
2219 (so->so_proto->pr_domain->dom_family == PF_ROUTE)) {
2220 so->so_fibnum = optval;
2221 /* Note: ignore error */
2222 if (so->so_proto && so->so_proto->pr_ctloutput)
2223 (*so->so_proto->pr_ctloutput)(so, sopt);
2224 } else {
2225 so->so_fibnum = 0;
2226 }
2227 break;
2228 case SO_SNDBUF:
2229 case SO_RCVBUF:
2230 case SO_SNDLOWAT:
2231 case SO_RCVLOWAT:
2232 error = sooptcopyin(sopt, &optval, sizeof optval,
2233 sizeof optval);
2234 if (error)
2235 goto bad;
2236
2237 /*
2238 * Values < 1 make no sense for any of these options,
2239 * so disallow them.
2240 */
2241 if (optval < 1) {
2242 error = EINVAL;
2243 goto bad;
2244 }
2245
2246 switch (sopt->sopt_name) {
2247 case SO_SNDBUF:
2248 case SO_RCVBUF:
2249 if (sbreserve(sopt->sopt_name == SO_SNDBUF ?
2250 &so->so_snd : &so->so_rcv, (u_long)optval,
2251 so, curthread) == 0) {
2252 error = ENOBUFS;
2253 goto bad;
2254 }
2255 (sopt->sopt_name == SO_SNDBUF ? &so->so_snd :
2256 &so->so_rcv)->sb_flags &= ~SB_AUTOSIZE;
2257 break;
2258
2259 /*
2260 * Make sure the low-water is never greater than the
2261 * high-water.
2262 */
2263 case SO_SNDLOWAT:
2264 SOCKBUF_LOCK(&so->so_snd);
2265 so->so_snd.sb_lowat =
2266 (optval > so->so_snd.sb_hiwat) ?
2267 so->so_snd.sb_hiwat : optval;
2268 SOCKBUF_UNLOCK(&so->so_snd);
2269 break;
2270 case SO_RCVLOWAT:
2271 SOCKBUF_LOCK(&so->so_rcv);
2272 so->so_rcv.sb_lowat =
2273 (optval > so->so_rcv.sb_hiwat) ?
2274 so->so_rcv.sb_hiwat : optval;
2275 SOCKBUF_UNLOCK(&so->so_rcv);
2276 break;
2277 }
2278 break;
2279
2280 case SO_SNDTIMEO:
2281 case SO_RCVTIMEO:
2282 #ifdef COMPAT_IA32
2283 if (curthread->td_proc->p_sysent == &ia32_freebsd_sysvec) {
2284 struct timeval32 tv32;
2285
2286 error = sooptcopyin(sopt, &tv32, sizeof tv32,
2287 sizeof tv32);
2288 CP(tv32, tv, tv_sec);
2289 CP(tv32, tv, tv_usec);
2290 } else
2291 #endif
2292 error = sooptcopyin(sopt, &tv, sizeof tv,
2293 sizeof tv);
2294 if (error)
2295 goto bad;
2296
2297 /* assert(hz > 0); */
2298 if (tv.tv_sec < 0 || tv.tv_sec > INT_MAX / hz ||
2299 tv.tv_usec < 0 || tv.tv_usec >= 1000000) {
2300 error = EDOM;
2301 goto bad;
2302 }
2303 /* assert(tick > 0); */
2304 /* assert(ULONG_MAX - INT_MAX >= 1000000); */
2305 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick;
2306 if (val > INT_MAX) {
2307 error = EDOM;
2308 goto bad;
2309 }
2310 if (val == 0 && tv.tv_usec != 0)
2311 val = 1;
2312
2313 switch (sopt->sopt_name) {
2314 case SO_SNDTIMEO:
2315 so->so_snd.sb_timeo = val;
2316 break;
2317 case SO_RCVTIMEO:
2318 so->so_rcv.sb_timeo = val;
2319 break;
2320 }
2321 break;
2322
2323 case SO_LABEL:
2324 #ifdef MAC
2325 error = sooptcopyin(sopt, &extmac, sizeof extmac,
2326 sizeof extmac);
2327 if (error)
2328 goto bad;
2329 error = mac_setsockopt_label(sopt->sopt_td->td_ucred,
2330 so, &extmac);
2331 #else
2332 error = EOPNOTSUPP;
2333 #endif
2334 break;
2335
2336 default:
2337 error = ENOPROTOOPT;
2338 break;
2339 }
2340 if (error == 0 && so->so_proto != NULL &&
2341 so->so_proto->pr_ctloutput != NULL) {
2342 (void) ((*so->so_proto->pr_ctloutput)
2343 (so, sopt));
2344 }
2345 }
2346 bad:
2347 return (error);
2348 }
2349
2350 /*
2351 * Helper routine for getsockopt.
2352 */
2353 int
2354 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
2355 {
2356 int error;
2357 size_t valsize;
2358
2359 error = 0;
2360
2361 /*
2362 * Documented get behavior is that we always return a value, possibly
2363 * truncated to fit in the user's buffer. Traditional behavior is
2364 * that we always tell the user precisely how much we copied, rather
2365 * than something useful like the total amount we had available for
2366 * her. Note that this interface is not idempotent; the entire
2367 * answer must generated ahead of time.
2368 */
2369 valsize = min(len, sopt->sopt_valsize);
2370 sopt->sopt_valsize = valsize;
2371 if (sopt->sopt_val != NULL) {
2372 if (sopt->sopt_td != NULL)
2373 error = copyout(buf, sopt->sopt_val, valsize);
2374 else
2375 bcopy(buf, sopt->sopt_val, valsize);
2376 }
2377 return (error);
2378 }
2379
2380 int
2381 sogetopt(struct socket *so, struct sockopt *sopt)
2382 {
2383 int error, optval;
2384 struct linger l;
2385 struct timeval tv;
2386 #ifdef MAC
2387 struct mac extmac;
2388 #endif
2389
2390 error = 0;
2391 if (sopt->sopt_level != SOL_SOCKET) {
2392 if (so->so_proto && so->so_proto->pr_ctloutput) {
2393 return ((*so->so_proto->pr_ctloutput)
2394 (so, sopt));
2395 } else
2396 return (ENOPROTOOPT);
2397 } else {
2398 switch (sopt->sopt_name) {
2399 #ifdef INET
2400 case SO_ACCEPTFILTER:
2401 error = do_getopt_accept_filter(so, sopt);
2402 break;
2403 #endif
2404 case SO_LINGER:
2405 SOCK_LOCK(so);
2406 l.l_onoff = so->so_options & SO_LINGER;
2407 l.l_linger = so->so_linger;
2408 SOCK_UNLOCK(so);
2409 error = sooptcopyout(sopt, &l, sizeof l);
2410 break;
2411
2412 case SO_USELOOPBACK:
2413 case SO_DONTROUTE:
2414 case SO_DEBUG:
2415 case SO_KEEPALIVE:
2416 case SO_REUSEADDR:
2417 case SO_REUSEPORT:
2418 case SO_BROADCAST:
2419 case SO_OOBINLINE:
2420 case SO_ACCEPTCONN:
2421 case SO_TIMESTAMP:
2422 case SO_BINTIME:
2423 case SO_NOSIGPIPE:
2424 optval = so->so_options & sopt->sopt_name;
2425 integer:
2426 error = sooptcopyout(sopt, &optval, sizeof optval);
2427 break;
2428
2429 case SO_TYPE:
2430 optval = so->so_type;
2431 goto integer;
2432
2433 case SO_ERROR:
2434 SOCK_LOCK(so);
2435 optval = so->so_error;
2436 so->so_error = 0;
2437 SOCK_UNLOCK(so);
2438 goto integer;
2439
2440 case SO_SNDBUF:
2441 optval = so->so_snd.sb_hiwat;
2442 goto integer;
2443
2444 case SO_RCVBUF:
2445 optval = so->so_rcv.sb_hiwat;
2446 goto integer;
2447
2448 case SO_SNDLOWAT:
2449 optval = so->so_snd.sb_lowat;
2450 goto integer;
2451
2452 case SO_RCVLOWAT:
2453 optval = so->so_rcv.sb_lowat;
2454 goto integer;
2455
2456 case SO_SNDTIMEO:
2457 case SO_RCVTIMEO:
2458 optval = (sopt->sopt_name == SO_SNDTIMEO ?
2459 so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
2460
2461 tv.tv_sec = optval / hz;
2462 tv.tv_usec = (optval % hz) * tick;
2463 #ifdef COMPAT_IA32
2464 if (curthread->td_proc->p_sysent == &ia32_freebsd_sysvec) {
2465 struct timeval32 tv32;
2466
2467 CP(tv, tv32, tv_sec);
2468 CP(tv, tv32, tv_usec);
2469 error = sooptcopyout(sopt, &tv32, sizeof tv32);
2470 } else
2471 #endif
2472 error = sooptcopyout(sopt, &tv, sizeof tv);
2473 break;
2474
2475 case SO_LABEL:
2476 #ifdef MAC
2477 error = sooptcopyin(sopt, &extmac, sizeof(extmac),
2478 sizeof(extmac));
2479 if (error)
2480 return (error);
2481 error = mac_getsockopt_label(sopt->sopt_td->td_ucred,
2482 so, &extmac);
2483 if (error)
2484 return (error);
2485 error = sooptcopyout(sopt, &extmac, sizeof extmac);
2486 #else
2487 error = EOPNOTSUPP;
2488 #endif
2489 break;
2490
2491 case SO_PEERLABEL:
2492 #ifdef MAC
2493 error = sooptcopyin(sopt, &extmac, sizeof(extmac),
2494 sizeof(extmac));
2495 if (error)
2496 return (error);
2497 error = mac_getsockopt_peerlabel(
2498 sopt->sopt_td->td_ucred, so, &extmac);
2499 if (error)
2500 return (error);
2501 error = sooptcopyout(sopt, &extmac, sizeof extmac);
2502 #else
2503 error = EOPNOTSUPP;
2504 #endif
2505 break;
2506
2507 case SO_LISTENQLIMIT:
2508 optval = so->so_qlimit;
2509 goto integer;
2510
2511 case SO_LISTENQLEN:
2512 optval = so->so_qlen;
2513 goto integer;
2514
2515 case SO_LISTENINCQLEN:
2516 optval = so->so_incqlen;
2517 goto integer;
2518
2519 default:
2520 error = ENOPROTOOPT;
2521 break;
2522 }
2523 return (error);
2524 }
2525 }
2526
2527 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
2528 int
2529 soopt_getm(struct sockopt *sopt, struct mbuf **mp)
2530 {
2531 struct mbuf *m, *m_prev;
2532 int sopt_size = sopt->sopt_valsize;
2533
2534 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA);
2535 if (m == NULL)
2536 return ENOBUFS;
2537 if (sopt_size > MLEN) {
2538 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT);
2539 if ((m->m_flags & M_EXT) == 0) {
2540 m_free(m);
2541 return ENOBUFS;
2542 }
2543 m->m_len = min(MCLBYTES, sopt_size);
2544 } else {
2545 m->m_len = min(MLEN, sopt_size);
2546 }
2547 sopt_size -= m->m_len;
2548 *mp = m;
2549 m_prev = m;
2550
2551 while (sopt_size) {
2552 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA);
2553 if (m == NULL) {
2554 m_freem(*mp);
2555 return ENOBUFS;
2556 }
2557 if (sopt_size > MLEN) {
2558 MCLGET(m, sopt->sopt_td != NULL ? M_TRYWAIT :
2559 M_DONTWAIT);
2560 if ((m->m_flags & M_EXT) == 0) {
2561 m_freem(m);
2562 m_freem(*mp);
2563 return ENOBUFS;
2564 }
2565 m->m_len = min(MCLBYTES, sopt_size);
2566 } else {
2567 m->m_len = min(MLEN, sopt_size);
2568 }
2569 sopt_size -= m->m_len;
2570 m_prev->m_next = m;
2571 m_prev = m;
2572 }
2573 return (0);
2574 }
2575
2576 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */
2577 int
2578 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
2579 {
2580 struct mbuf *m0 = m;
2581
2582 if (sopt->sopt_val == NULL)
2583 return (0);
2584 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
2585 if (sopt->sopt_td != NULL) {
2586 int error;
2587
2588 error = copyin(sopt->sopt_val, mtod(m, char *),
2589 m->m_len);
2590 if (error != 0) {
2591 m_freem(m0);
2592 return(error);
2593 }
2594 } else
2595 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len);
2596 sopt->sopt_valsize -= m->m_len;
2597 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
2598 m = m->m_next;
2599 }
2600 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
2601 panic("ip6_sooptmcopyin");
2602 return (0);
2603 }
2604
2605 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */
2606 int
2607 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
2608 {
2609 struct mbuf *m0 = m;
2610 size_t valsize = 0;
2611
2612 if (sopt->sopt_val == NULL)
2613 return (0);
2614 while (m != NULL && sopt->sopt_valsize >= m->m_len) {
2615 if (sopt->sopt_td != NULL) {
2616 int error;
2617
2618 error = copyout(mtod(m, char *), sopt->sopt_val,
2619 m->m_len);
2620 if (error != 0) {
2621 m_freem(m0);
2622 return(error);
2623 }
2624 } else
2625 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len);
2626 sopt->sopt_valsize -= m->m_len;
2627 sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
2628 valsize += m->m_len;
2629 m = m->m_next;
2630 }
2631 if (m != NULL) {
2632 /* enough soopt buffer should be given from user-land */
2633 m_freem(m0);
2634 return(EINVAL);
2635 }
2636 sopt->sopt_valsize = valsize;
2637 return (0);
2638 }
2639
2640 /*
2641 * sohasoutofband(): protocol notifies socket layer of the arrival of new
2642 * out-of-band data, which will then notify socket consumers.
2643 */
2644 void
2645 sohasoutofband(struct socket *so)
2646 {
2647
2648 if (so->so_sigio != NULL)
2649 pgsigio(&so->so_sigio, SIGURG, 0);
2650 selwakeuppri(&so->so_rcv.sb_sel, PSOCK);
2651 }
2652
2653 int
2654 sopoll(struct socket *so, int events, struct ucred *active_cred,
2655 struct thread *td)
2656 {
2657
2658 return (so->so_proto->pr_usrreqs->pru_sopoll(so, events, active_cred,
2659 td));
2660 }
2661
2662 int
2663 sopoll_generic(struct socket *so, int events, struct ucred *active_cred,
2664 struct thread *td)
2665 {
2666 int revents = 0;
2667
2668 SOCKBUF_LOCK(&so->so_snd);
2669 SOCKBUF_LOCK(&so->so_rcv);
2670 if (events & (POLLIN | POLLRDNORM))
2671 if (soreadable(so))
2672 revents |= events & (POLLIN | POLLRDNORM);
2673
2674 if (events & POLLINIGNEOF)
2675 if (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat ||
2676 !TAILQ_EMPTY(&so->so_comp) || so->so_error)
2677 revents |= POLLINIGNEOF;
2678
2679 if (events & (POLLOUT | POLLWRNORM))
2680 if (sowriteable(so))
2681 revents |= events & (POLLOUT | POLLWRNORM);
2682
2683 if (events & (POLLPRI | POLLRDBAND))
2684 if (so->so_oobmark || (so->so_rcv.sb_state & SBS_RCVATMARK))
2685 revents |= events & (POLLPRI | POLLRDBAND);
2686
2687 if (revents == 0) {
2688 if (events &
2689 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM |
2690 POLLRDBAND)) {
2691 selrecord(td, &so->so_rcv.sb_sel);
2692 so->so_rcv.sb_flags |= SB_SEL;
2693 }
2694
2695 if (events & (POLLOUT | POLLWRNORM)) {
2696 selrecord(td, &so->so_snd.sb_sel);
2697 so->so_snd.sb_flags |= SB_SEL;
2698 }
2699 }
2700
2701 SOCKBUF_UNLOCK(&so->so_rcv);
2702 SOCKBUF_UNLOCK(&so->so_snd);
2703 return (revents);
2704 }
2705
2706 int
2707 soo_kqfilter(struct file *fp, struct knote *kn)
2708 {
2709 struct socket *so = kn->kn_fp->f_data;
2710 struct sockbuf *sb;
2711
2712 switch (kn->kn_filter) {
2713 case EVFILT_READ:
2714 if (so->so_options & SO_ACCEPTCONN)
2715 kn->kn_fop = &solisten_filtops;
2716 else
2717 kn->kn_fop = &soread_filtops;
2718 sb = &so->so_rcv;
2719 break;
2720 case EVFILT_WRITE:
2721 kn->kn_fop = &sowrite_filtops;
2722 sb = &so->so_snd;
2723 break;
2724 default:
2725 return (EINVAL);
2726 }
2727
2728 SOCKBUF_LOCK(sb);
2729 knlist_add(&sb->sb_sel.si_note, kn, 1);
2730 sb->sb_flags |= SB_KNOTE;
2731 SOCKBUF_UNLOCK(sb);
2732 return (0);
2733 }
2734
2735 /*
2736 * Some routines that return EOPNOTSUPP for entry points that are not
2737 * supported by a protocol. Fill in as needed.
2738 */
2739 int
2740 pru_accept_notsupp(struct socket *so, struct sockaddr **nam)
2741 {
2742
2743 return EOPNOTSUPP;
2744 }
2745
2746 int
2747 pru_attach_notsupp(struct socket *so, int proto, struct thread *td)
2748 {
2749
2750 return EOPNOTSUPP;
2751 }
2752
2753 int
2754 pru_bind_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
2755 {
2756
2757 return EOPNOTSUPP;
2758 }
2759
2760 int
2761 pru_connect_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
2762 {
2763
2764 return EOPNOTSUPP;
2765 }
2766
2767 int
2768 pru_connect2_notsupp(struct socket *so1, struct socket *so2)
2769 {
2770
2771 return EOPNOTSUPP;
2772 }
2773
2774 int
2775 pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
2776 struct ifnet *ifp, struct thread *td)
2777 {
2778
2779 return EOPNOTSUPP;
2780 }
2781
2782 int
2783 pru_disconnect_notsupp(struct socket *so)
2784 {
2785
2786 return EOPNOTSUPP;
2787 }
2788
2789 int
2790 pru_listen_notsupp(struct socket *so, int backlog, struct thread *td)
2791 {
2792
2793 return EOPNOTSUPP;
2794 }
2795
2796 int
2797 pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam)
2798 {
2799
2800 return EOPNOTSUPP;
2801 }
2802
2803 int
2804 pru_rcvd_notsupp(struct socket *so, int flags)
2805 {
2806
2807 return EOPNOTSUPP;
2808 }
2809
2810 int
2811 pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags)
2812 {
2813
2814 return EOPNOTSUPP;
2815 }
2816
2817 int
2818 pru_send_notsupp(struct socket *so, int flags, struct mbuf *m,
2819 struct sockaddr *addr, struct mbuf *control, struct thread *td)
2820 {
2821
2822 return EOPNOTSUPP;
2823 }
2824
2825 /*
2826 * This isn't really a ``null'' operation, but it's the default one and
2827 * doesn't do anything destructive.
2828 */
2829 int
2830 pru_sense_null(struct socket *so, struct stat *sb)
2831 {
2832
2833 sb->st_blksize = so->so_snd.sb_hiwat;
2834 return 0;
2835 }
2836
2837 int
2838 pru_shutdown_notsupp(struct socket *so)
2839 {
2840
2841 return EOPNOTSUPP;
2842 }
2843
2844 int
2845 pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam)
2846 {
2847
2848 return EOPNOTSUPP;
2849 }
2850
2851 int
2852 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
2853 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
2854 {
2855
2856 return EOPNOTSUPP;
2857 }
2858
2859 int
2860 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
2861 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
2862 {
2863
2864 return EOPNOTSUPP;
2865 }
2866
2867 int
2868 pru_sopoll_notsupp(struct socket *so, int events, struct ucred *cred,
2869 struct thread *td)
2870 {
2871
2872 return EOPNOTSUPP;
2873 }
2874
2875 static void
2876 filt_sordetach(struct knote *kn)
2877 {
2878 struct socket *so = kn->kn_fp->f_data;
2879
2880 SOCKBUF_LOCK(&so->so_rcv);
2881 knlist_remove(&so->so_rcv.sb_sel.si_note, kn, 1);
2882 if (knlist_empty(&so->so_rcv.sb_sel.si_note))
2883 so->so_rcv.sb_flags &= ~SB_KNOTE;
2884 SOCKBUF_UNLOCK(&so->so_rcv);
2885 }
2886
2887 /*ARGSUSED*/
2888 static int
2889 filt_soread(struct knote *kn, long hint)
2890 {
2891 struct socket *so;
2892
2893 so = kn->kn_fp->f_data;
2894 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
2895
2896 kn->kn_data = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
2897 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
2898 kn->kn_flags |= EV_EOF;
2899 kn->kn_fflags = so->so_error;
2900 return (1);
2901 } else if (so->so_error) /* temporary udp error */
2902 return (1);
2903 else if (kn->kn_sfflags & NOTE_LOWAT)
2904 return (kn->kn_data >= kn->kn_sdata);
2905 else
2906 return (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat);
2907 }
2908
2909 static void
2910 filt_sowdetach(struct knote *kn)
2911 {
2912 struct socket *so = kn->kn_fp->f_data;
2913
2914 SOCKBUF_LOCK(&so->so_snd);
2915 knlist_remove(&so->so_snd.sb_sel.si_note, kn, 1);
2916 if (knlist_empty(&so->so_snd.sb_sel.si_note))
2917 so->so_snd.sb_flags &= ~SB_KNOTE;
2918 SOCKBUF_UNLOCK(&so->so_snd);
2919 }
2920
2921 /*ARGSUSED*/
2922 static int
2923 filt_sowrite(struct knote *kn, long hint)
2924 {
2925 struct socket *so;
2926
2927 so = kn->kn_fp->f_data;
2928 SOCKBUF_LOCK_ASSERT(&so->so_snd);
2929 kn->kn_data = sbspace(&so->so_snd);
2930 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
2931 kn->kn_flags |= EV_EOF;
2932 kn->kn_fflags = so->so_error;
2933 return (1);
2934 } else if (so->so_error) /* temporary udp error */
2935 return (1);
2936 else if (((so->so_state & SS_ISCONNECTED) == 0) &&
2937 (so->so_proto->pr_flags & PR_CONNREQUIRED))
2938 return (0);
2939 else if (kn->kn_sfflags & NOTE_LOWAT)
2940 return (kn->kn_data >= kn->kn_sdata);
2941 else
2942 return (kn->kn_data >= so->so_snd.sb_lowat);
2943 }
2944
2945 /*ARGSUSED*/
2946 static int
2947 filt_solisten(struct knote *kn, long hint)
2948 {
2949 struct socket *so = kn->kn_fp->f_data;
2950
2951 kn->kn_data = so->so_qlen;
2952 return (! TAILQ_EMPTY(&so->so_comp));
2953 }
2954
2955 int
2956 socheckuid(struct socket *so, uid_t uid)
2957 {
2958
2959 if (so == NULL)
2960 return (EPERM);
2961 if (so->so_cred->cr_uid != uid)
2962 return (EPERM);
2963 return (0);
2964 }
2965
2966 static int
2967 sysctl_somaxconn(SYSCTL_HANDLER_ARGS)
2968 {
2969 int error;
2970 int val;
2971
2972 val = somaxconn;
2973 error = sysctl_handle_int(oidp, &val, 0, req);
2974 if (error || !req->newptr )
2975 return (error);
2976
2977 if (val < 1 || val > USHRT_MAX)
2978 return (EINVAL);
2979
2980 somaxconn = val;
2981 return (0);
2982 }
2983
2984 /*
2985 * These functions are used by protocols to notify the socket layer (and its
2986 * consumers) of state changes in the sockets driven by protocol-side events.
2987 */
2988
2989 /*
2990 * Procedures to manipulate state flags of socket and do appropriate wakeups.
2991 *
2992 * Normal sequence from the active (originating) side is that
2993 * soisconnecting() is called during processing of connect() call, resulting
2994 * in an eventual call to soisconnected() if/when the connection is
2995 * established. When the connection is torn down soisdisconnecting() is
2996 * called during processing of disconnect() call, and soisdisconnected() is
2997 * called when the connection to the peer is totally severed. The semantics
2998 * of these routines are such that connectionless protocols can call
2999 * soisconnected() and soisdisconnected() only, bypassing the in-progress
3000 * calls when setting up a ``connection'' takes no time.
3001 *
3002 * From the passive side, a socket is created with two queues of sockets:
3003 * so_incomp for connections in progress and so_comp for connections already
3004 * made and awaiting user acceptance. As a protocol is preparing incoming
3005 * connections, it creates a socket structure queued on so_incomp by calling
3006 * sonewconn(). When the connection is established, soisconnected() is
3007 * called, and transfers the socket structure to so_comp, making it available
3008 * to accept().
3009 *
3010 * If a socket is closed with sockets on either so_incomp or so_comp, these
3011 * sockets are dropped.
3012 *
3013 * If higher-level protocols are implemented in the kernel, the wakeups done
3014 * here will sometimes cause software-interrupt process scheduling.
3015 */
3016 void
3017 soisconnecting(struct socket *so)
3018 {
3019
3020 SOCK_LOCK(so);
3021 so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
3022 so->so_state |= SS_ISCONNECTING;
3023 SOCK_UNLOCK(so);
3024 }
3025
3026 void
3027 soisconnected(struct socket *so)
3028 {
3029 struct socket *head;
3030
3031 ACCEPT_LOCK();
3032 SOCK_LOCK(so);
3033 so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
3034 so->so_state |= SS_ISCONNECTED;
3035 head = so->so_head;
3036 if (head != NULL && (so->so_qstate & SQ_INCOMP)) {
3037 if ((so->so_options & SO_ACCEPTFILTER) == 0) {
3038 SOCK_UNLOCK(so);
3039 TAILQ_REMOVE(&head->so_incomp, so, so_list);
3040 head->so_incqlen--;
3041 so->so_qstate &= ~SQ_INCOMP;
3042 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
3043 head->so_qlen++;
3044 so->so_qstate |= SQ_COMP;
3045 ACCEPT_UNLOCK();
3046 sorwakeup(head);
3047 wakeup_one(&head->so_timeo);
3048 } else {
3049 ACCEPT_UNLOCK();
3050 so->so_upcall =
3051 head->so_accf->so_accept_filter->accf_callback;
3052 so->so_upcallarg = head->so_accf->so_accept_filter_arg;
3053 so->so_rcv.sb_flags |= SB_UPCALL;
3054 so->so_options &= ~SO_ACCEPTFILTER;
3055 SOCK_UNLOCK(so);
3056 so->so_upcall(so, so->so_upcallarg, M_DONTWAIT);
3057 }
3058 return;
3059 }
3060 SOCK_UNLOCK(so);
3061 ACCEPT_UNLOCK();
3062 wakeup(&so->so_timeo);
3063 sorwakeup(so);
3064 sowwakeup(so);
3065 }
3066
3067 void
3068 soisdisconnecting(struct socket *so)
3069 {
3070
3071 /*
3072 * Note: This code assumes that SOCK_LOCK(so) and
3073 * SOCKBUF_LOCK(&so->so_rcv) are the same.
3074 */
3075 SOCKBUF_LOCK(&so->so_rcv);
3076 so->so_state &= ~SS_ISCONNECTING;
3077 so->so_state |= SS_ISDISCONNECTING;
3078 so->so_rcv.sb_state |= SBS_CANTRCVMORE;
3079 sorwakeup_locked(so);
3080 SOCKBUF_LOCK(&so->so_snd);
3081 so->so_snd.sb_state |= SBS_CANTSENDMORE;
3082 sowwakeup_locked(so);
3083 wakeup(&so->so_timeo);
3084 }
3085
3086 void
3087 soisdisconnected(struct socket *so)
3088 {
3089
3090 /*
3091 * Note: This code assumes that SOCK_LOCK(so) and
3092 * SOCKBUF_LOCK(&so->so_rcv) are the same.
3093 */
3094 SOCKBUF_LOCK(&so->so_rcv);
3095 so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
3096 so->so_state |= SS_ISDISCONNECTED;
3097 so->so_rcv.sb_state |= SBS_CANTRCVMORE;
3098 sorwakeup_locked(so);
3099 SOCKBUF_LOCK(&so->so_snd);
3100 so->so_snd.sb_state |= SBS_CANTSENDMORE;
3101 sbdrop_locked(&so->so_snd, so->so_snd.sb_cc);
3102 sowwakeup_locked(so);
3103 wakeup(&so->so_timeo);
3104 }
3105
3106 /*
3107 * Make a copy of a sockaddr in a malloced buffer of type M_SONAME.
3108 */
3109 struct sockaddr *
3110 sodupsockaddr(const struct sockaddr *sa, int mflags)
3111 {
3112 struct sockaddr *sa2;
3113
3114 sa2 = malloc(sa->sa_len, M_SONAME, mflags);
3115 if (sa2)
3116 bcopy(sa, sa2, sa->sa_len);
3117 return sa2;
3118 }
3119
3120 /*
3121 * Create an external-format (``xsocket'') structure using the information in
3122 * the kernel-format socket structure pointed to by so. This is done to
3123 * reduce the spew of irrelevant information over this interface, to isolate
3124 * user code from changes in the kernel structure, and potentially to provide
3125 * information-hiding if we decide that some of this information should be
3126 * hidden from users.
3127 */
3128 void
3129 sotoxsocket(struct socket *so, struct xsocket *xso)
3130 {
3131
3132 xso->xso_len = sizeof *xso;
3133 xso->xso_so = so;
3134 xso->so_type = so->so_type;
3135 xso->so_options = so->so_options;
3136 xso->so_linger = so->so_linger;
3137 xso->so_state = so->so_state;
3138 xso->so_pcb = so->so_pcb;
3139 xso->xso_protocol = so->so_proto->pr_protocol;
3140 xso->xso_family = so->so_proto->pr_domain->dom_family;
3141 xso->so_qlen = so->so_qlen;
3142 xso->so_incqlen = so->so_incqlen;
3143 xso->so_qlimit = so->so_qlimit;
3144 xso->so_timeo = so->so_timeo;
3145 xso->so_error = so->so_error;
3146 xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
3147 xso->so_oobmark = so->so_oobmark;
3148 sbtoxsockbuf(&so->so_snd, &xso->so_snd);
3149 sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
3150 xso->so_uid = so->so_cred->cr_uid;
3151 }
3152
3153
3154 /*
3155 * Socket accessor functions to provide external consumers with
3156 * a safe interface to socket state
3157 *
3158 */
3159
3160 void
3161 so_listeners_apply_all(struct socket *so, void (*func)(struct socket *, void *), void *arg)
3162 {
3163
3164 TAILQ_FOREACH(so, &so->so_comp, so_list)
3165 func(so, arg);
3166 }
3167
3168 struct sockbuf *
3169 so_sockbuf_rcv(struct socket *so)
3170 {
3171
3172 return (&so->so_rcv);
3173 }
3174
3175 struct sockbuf *
3176 so_sockbuf_snd(struct socket *so)
3177 {
3178
3179 return (&so->so_snd);
3180 }
3181
3182 int
3183 so_state_get(const struct socket *so)
3184 {
3185
3186 return (so->so_state);
3187 }
3188
3189 void
3190 so_state_set(struct socket *so, int val)
3191 {
3192
3193 so->so_state = val;
3194 }
3195
3196 int
3197 so_options_get(const struct socket *so)
3198 {
3199
3200 return (so->so_options);
3201 }
3202
3203 void
3204 so_options_set(struct socket *so, int val)
3205 {
3206
3207 so->so_options = val;
3208 }
3209
3210 int
3211 so_error_get(const struct socket *so)
3212 {
3213
3214 return (so->so_error);
3215 }
3216
3217 void
3218 so_error_set(struct socket *so, int val)
3219 {
3220
3221 so->so_error = val;
3222 }
3223
3224 int
3225 so_linger_get(const struct socket *so)
3226 {
3227
3228 return (so->so_linger);
3229 }
3230
3231 void
3232 so_linger_set(struct socket *so, int val)
3233 {
3234
3235 so->so_linger = val;
3236 }
3237
3238 struct protosw *
3239 so_protosw_get(const struct socket *so)
3240 {
3241
3242 return (so->so_proto);
3243 }
3244
3245 void
3246 so_protosw_set(struct socket *so, struct protosw *val)
3247 {
3248
3249 so->so_proto = val;
3250 }
3251
3252 void
3253 so_sorwakeup(struct socket *so)
3254 {
3255
3256 sorwakeup(so);
3257 }
3258
3259 void
3260 so_sowwakeup(struct socket *so)
3261 {
3262
3263 sowwakeup(so);
3264 }
3265
3266 void
3267 so_sorwakeup_locked(struct socket *so)
3268 {
3269
3270 sorwakeup_locked(so);
3271 }
3272
3273 void
3274 so_sowwakeup_locked(struct socket *so)
3275 {
3276
3277 sowwakeup_locked(so);
3278 }
3279
3280 void
3281 so_lock(struct socket *so)
3282 {
3283 SOCK_LOCK(so);
3284 }
3285
3286 void
3287 so_unlock(struct socket *so)
3288 {
3289 SOCK_UNLOCK(so);
3290 }
Cache object: 42a29d06c0ffb726e6d119079251cc89
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