xref: /dragonfly/sys/kern/uipc_socket.c (revision 71126e33)
1 /*
2  * Copyright (c) 2004 Jeffrey M. Hsu.  All rights reserved.
3  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
4  *
5  * This code is derived from software contributed to The DragonFly Project
6  * by Jeffrey M. Hsu.
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  * 3. Neither the name of The DragonFly Project nor the names of its
17  *    contributors may be used to endorse or promote products derived
18  *    from this software without specific, prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 /*
35  * Copyright (c) 2004 Jeffrey M. Hsu.  All rights reserved.
36  *
37  * License terms: all terms for the DragonFly license above plus the following:
38  *
39  * 4. All advertising materials mentioning features or use of this software
40  *    must display the following acknowledgement:
41  *
42  *	This product includes software developed by Jeffrey M. Hsu
43  *	for the DragonFly Project.
44  *
45  *    This requirement may be waived with permission from Jeffrey Hsu.
46  *    This requirement will sunset and may be removed on July 8 2005,
47  *    after which the standard DragonFly license (as shown above) will
48  *    apply.
49  */
50 
51 /*
52  * Copyright (c) 1982, 1986, 1988, 1990, 1993
53  *	The Regents of the University of California.  All rights reserved.
54  *
55  * Redistribution and use in source and binary forms, with or without
56  * modification, are permitted provided that the following conditions
57  * are met:
58  * 1. Redistributions of source code must retain the above copyright
59  *    notice, this list of conditions and the following disclaimer.
60  * 2. Redistributions in binary form must reproduce the above copyright
61  *    notice, this list of conditions and the following disclaimer in the
62  *    documentation and/or other materials provided with the distribution.
63  * 3. All advertising materials mentioning features or use of this software
64  *    must display the following acknowledgement:
65  *	This product includes software developed by the University of
66  *	California, Berkeley and its contributors.
67  * 4. Neither the name of the University nor the names of its contributors
68  *    may be used to endorse or promote products derived from this software
69  *    without specific prior written permission.
70  *
71  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
72  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
73  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
74  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
75  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
76  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
77  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
78  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
79  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
80  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
81  * SUCH DAMAGE.
82  *
83  *	@(#)uipc_socket.c	8.3 (Berkeley) 4/15/94
84  * $FreeBSD: src/sys/kern/uipc_socket.c,v 1.68.2.24 2003/11/11 17:18:18 silby Exp $
85  * $DragonFly: src/sys/kern/uipc_socket.c,v 1.26 2004/12/08 23:59:01 hsu Exp $
86  */
87 
88 #include "opt_inet.h"
89 
90 #include <sys/param.h>
91 #include <sys/systm.h>
92 #include <sys/fcntl.h>
93 #include <sys/malloc.h>
94 #include <sys/mbuf.h>
95 #include <sys/domain.h>
96 #include <sys/file.h>			/* for struct knote */
97 #include <sys/kernel.h>
98 #include <sys/malloc.h>
99 #include <sys/event.h>
100 #include <sys/poll.h>
101 #include <sys/proc.h>
102 #include <sys/protosw.h>
103 #include <sys/socket.h>
104 #include <sys/socketvar.h>
105 #include <sys/socketops.h>
106 #include <sys/resourcevar.h>
107 #include <sys/signalvar.h>
108 #include <sys/sysctl.h>
109 #include <sys/uio.h>
110 #include <sys/jail.h>
111 #include <vm/vm_zone.h>
112 
113 #include <machine/limits.h>
114 
115 #ifdef INET
116 static int	 do_setopt_accept_filter(struct socket *so, struct sockopt *sopt);
117 #endif /* INET */
118 
119 static void 	filt_sordetach(struct knote *kn);
120 static int 	filt_soread(struct knote *kn, long hint);
121 static void 	filt_sowdetach(struct knote *kn);
122 static int	filt_sowrite(struct knote *kn, long hint);
123 static int	filt_solisten(struct knote *kn, long hint);
124 
125 static struct filterops solisten_filtops =
126 	{ 1, NULL, filt_sordetach, filt_solisten };
127 static struct filterops soread_filtops =
128 	{ 1, NULL, filt_sordetach, filt_soread };
129 static struct filterops sowrite_filtops =
130 	{ 1, NULL, filt_sowdetach, filt_sowrite };
131 
132 struct	vm_zone *socket_zone;
133 so_gen_t	so_gencnt;	/* generation count for sockets */
134 
135 MALLOC_DEFINE(M_SONAME, "soname", "socket name");
136 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
137 
138 
139 static int somaxconn = SOMAXCONN;
140 SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW,
141     &somaxconn, 0, "Maximum pending socket connection queue size");
142 
143 /*
144  * Socket operation routines.
145  * These routines are called by the routines in
146  * sys_socket.c or from a system process, and
147  * implement the semantics of socket operations by
148  * switching out to the protocol specific routines.
149  */
150 
151 /*
152  * Get a socket structure from our zone, and initialize it.
153  * We don't implement `waitok' yet (see comments in uipc_domain.c).
154  * Note that it would probably be better to allocate socket
155  * and PCB at the same time, but I'm not convinced that all
156  * the protocols can be easily modified to do this.
157  */
158 struct socket *
159 soalloc(waitok)
160 	int waitok;
161 {
162 	struct socket *so;
163 
164 	so = zalloc(socket_zone);
165 	if (so) {
166 		/* XXX race condition for reentrant kernel */
167 		bzero(so, sizeof *so);
168 		so->so_gencnt = ++so_gencnt;
169 		TAILQ_INIT(&so->so_aiojobq);
170 		TAILQ_INIT(&so->so_rcv.sb_sel.si_mlist);
171 		TAILQ_INIT(&so->so_snd.sb_sel.si_mlist);
172 	}
173 	return so;
174 }
175 
176 int
177 socreate(int dom, struct socket **aso, int type,
178 	int proto, struct thread *td)
179 {
180 	struct proc *p = td->td_proc;
181 	struct protosw *prp;
182 	struct socket *so;
183 	struct pru_attach_info ai;
184 	int error;
185 
186 	if (proto)
187 		prp = pffindproto(dom, proto, type);
188 	else
189 		prp = pffindtype(dom, type);
190 
191 	if (prp == 0 || prp->pr_usrreqs->pru_attach == 0)
192 		return (EPROTONOSUPPORT);
193 
194 	if (p->p_ucred->cr_prison && jail_socket_unixiproute_only &&
195 	    prp->pr_domain->dom_family != PF_LOCAL &&
196 	    prp->pr_domain->dom_family != PF_INET &&
197 	    prp->pr_domain->dom_family != PF_ROUTE) {
198 		return (EPROTONOSUPPORT);
199 	}
200 
201 	if (prp->pr_type != type)
202 		return (EPROTOTYPE);
203 	so = soalloc(p != 0);
204 	if (so == 0)
205 		return (ENOBUFS);
206 
207 	TAILQ_INIT(&so->so_incomp);
208 	TAILQ_INIT(&so->so_comp);
209 	so->so_type = type;
210 	so->so_cred = crhold(p->p_ucred);
211 	so->so_proto = prp;
212 	ai.sb_rlimit = &p->p_rlimit[RLIMIT_SBSIZE];
213 	ai.p_ucred = p->p_ucred;
214 	ai.fd_rdir = p->p_fd->fd_rdir;
215 	error = so_pru_attach(so, proto, &ai);
216 	if (error) {
217 		so->so_state |= SS_NOFDREF;
218 		sofree(so);
219 		return (error);
220 	}
221 	*aso = so;
222 	return (0);
223 }
224 
225 int
226 sobind(struct socket *so, struct sockaddr *nam, struct thread *td)
227 {
228 	int s = splnet();
229 	int error;
230 
231 	error = so_pru_bind(so, nam, td);
232 	splx(s);
233 	return (error);
234 }
235 
236 void
237 sodealloc(struct socket *so)
238 {
239 
240 	so->so_gencnt = ++so_gencnt;
241 	if (so->so_rcv.sb_hiwat)
242 		(void)chgsbsize(so->so_cred->cr_uidinfo,
243 		    &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
244 	if (so->so_snd.sb_hiwat)
245 		(void)chgsbsize(so->so_cred->cr_uidinfo,
246 		    &so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
247 #ifdef INET
248 	/* remove accept filter if present */
249 	if (so->so_accf != NULL)
250 		do_setopt_accept_filter(so, NULL);
251 #endif /* INET */
252 	crfree(so->so_cred);
253 	zfree(socket_zone, so);
254 }
255 
256 int
257 solisten(struct socket *so, int backlog, struct thread *td)
258 {
259 	int s, error;
260 
261 	s = splnet();
262  	if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING)) {
263  		splx(s);
264  		return (EINVAL);
265  	}
266 
267 	error = so_pru_listen(so, td);
268 	if (error) {
269 		splx(s);
270 		return (error);
271 	}
272 	if (TAILQ_EMPTY(&so->so_comp))
273 		so->so_options |= SO_ACCEPTCONN;
274 	if (backlog < 0 || backlog > somaxconn)
275 		backlog = somaxconn;
276 	so->so_qlimit = backlog;
277 	splx(s);
278 	return (0);
279 }
280 
281 void
282 sofree(struct socket *so)
283 {
284 	struct socket *head = so->so_head;
285 
286 	if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
287 		return;
288 	if (head != NULL) {
289 		if (so->so_state & SS_INCOMP) {
290 			TAILQ_REMOVE(&head->so_incomp, so, so_list);
291 			head->so_incqlen--;
292 		} else if (so->so_state & SS_COMP) {
293 			/*
294 			 * We must not decommission a socket that's
295 			 * on the accept(2) queue.  If we do, then
296 			 * accept(2) may hang after select(2) indicated
297 			 * that the listening socket was ready.
298 			 */
299 			return;
300 		} else {
301 			panic("sofree: not queued");
302 		}
303 		so->so_state &= ~SS_INCOMP;
304 		so->so_head = NULL;
305 	}
306 	sbrelease(&so->so_snd, so);
307 	sorflush(so);
308 	sodealloc(so);
309 }
310 
311 /*
312  * Close a socket on last file table reference removal.
313  * Initiate disconnect if connected.
314  * Free socket when disconnect complete.
315  */
316 int
317 soclose(struct socket *so)
318 {
319 	int s = splnet();		/* conservative */
320 	int error = 0;
321 
322 	funsetown(so->so_sigio);
323 	if (so->so_pcb == NULL)
324 		goto discard;
325 	if (so->so_state & SS_ISCONNECTED) {
326 		if ((so->so_state & SS_ISDISCONNECTING) == 0) {
327 			error = sodisconnect(so);
328 			if (error)
329 				goto drop;
330 		}
331 		if (so->so_options & SO_LINGER) {
332 			if ((so->so_state & SS_ISDISCONNECTING) &&
333 			    (so->so_state & SS_NBIO))
334 				goto drop;
335 			while (so->so_state & SS_ISCONNECTED) {
336 				error = tsleep((caddr_t)&so->so_timeo,
337 				    PCATCH, "soclos", so->so_linger * hz);
338 				if (error)
339 					break;
340 			}
341 		}
342 	}
343 drop:
344 	if (so->so_pcb) {
345 		int error2;
346 
347 		error2 = so_pru_detach(so);
348 		if (error == 0)
349 			error = error2;
350 	}
351 discard:
352 	if (so->so_options & SO_ACCEPTCONN) {
353 		struct socket *sp, *sonext;
354 
355 		sp = TAILQ_FIRST(&so->so_incomp);
356 		for (; sp != NULL; sp = sonext) {
357 			sonext = TAILQ_NEXT(sp, so_list);
358 			(void) soabort(sp);
359 		}
360 		for (sp = TAILQ_FIRST(&so->so_comp); sp != NULL; sp = sonext) {
361 			sonext = TAILQ_NEXT(sp, so_list);
362 			/* Dequeue from so_comp since sofree() won't do it */
363 			TAILQ_REMOVE(&so->so_comp, sp, so_list);
364 			so->so_qlen--;
365 			sp->so_state &= ~SS_COMP;
366 			sp->so_head = NULL;
367 			(void) soabort(sp);
368 		}
369 	}
370 	if (so->so_state & SS_NOFDREF)
371 		panic("soclose: NOFDREF");
372 	so->so_state |= SS_NOFDREF;
373 	sofree(so);
374 	splx(s);
375 	return (error);
376 }
377 
378 /*
379  * Must be called at splnet...
380  */
381 int
382 soabort(so)
383 	struct socket *so;
384 {
385 	int error;
386 
387 	error = so_pru_abort(so);
388 	if (error) {
389 		sofree(so);
390 		return error;
391 	}
392 	return (0);
393 }
394 
395 int
396 soaccept(struct socket *so, struct sockaddr **nam)
397 {
398 	int s = splnet();
399 	int error;
400 
401 	if ((so->so_state & SS_NOFDREF) == 0)
402 		panic("soaccept: !NOFDREF");
403 	so->so_state &= ~SS_NOFDREF;
404 	error = so_pru_accept(so, nam);
405 	splx(s);
406 	return (error);
407 }
408 
409 int
410 soconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
411 {
412 	int s;
413 	int error;
414 
415 	if (so->so_options & SO_ACCEPTCONN)
416 		return (EOPNOTSUPP);
417 	s = splnet();
418 	/*
419 	 * If protocol is connection-based, can only connect once.
420 	 * Otherwise, if connected, try to disconnect first.
421 	 * This allows user to disconnect by connecting to, e.g.,
422 	 * a null address.
423 	 */
424 	if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
425 	    ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
426 	    (error = sodisconnect(so))))
427 		error = EISCONN;
428 	else
429 		error = so_pru_connect(so, nam, td);
430 	splx(s);
431 	return (error);
432 }
433 
434 int
435 soconnect2(struct socket *so1, struct socket *so2)
436 {
437 	int s = splnet();
438 	int error;
439 
440 	error = so_pru_connect2(so1, so2);
441 	splx(s);
442 	return (error);
443 }
444 
445 int
446 sodisconnect(struct socket *so)
447 {
448 	int s = splnet();
449 	int error;
450 
451 	if ((so->so_state & SS_ISCONNECTED) == 0) {
452 		error = ENOTCONN;
453 		goto bad;
454 	}
455 	if (so->so_state & SS_ISDISCONNECTING) {
456 		error = EALREADY;
457 		goto bad;
458 	}
459 	error = so_pru_disconnect(so);
460 bad:
461 	splx(s);
462 	return (error);
463 }
464 
465 #define	SBLOCKWAIT(f)	(((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
466 /*
467  * Send on a socket.
468  * If send must go all at once and message is larger than
469  * send buffering, then hard error.
470  * Lock against other senders.
471  * If must go all at once and not enough room now, then
472  * inform user that this would block and do nothing.
473  * Otherwise, if nonblocking, send as much as possible.
474  * The data to be sent is described by "uio" if nonzero,
475  * otherwise by the mbuf chain "top" (which must be null
476  * if uio is not).  Data provided in mbuf chain must be small
477  * enough to send all at once.
478  *
479  * Returns nonzero on error, timeout or signal; callers
480  * must check for short counts if EINTR/ERESTART are returned.
481  * Data and control buffers are freed on return.
482  */
483 int
484 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
485 	struct mbuf *top, struct mbuf *control, int flags,
486 	struct thread *td)
487 {
488 	struct mbuf **mp;
489 	struct mbuf *m;
490 	long space, len, resid;
491 	int clen = 0, error, s, dontroute, mlen;
492 	int atomic = sosendallatonce(so) || top;
493 	int pru_flags;
494 
495 	if (uio)
496 		resid = uio->uio_resid;
497 	else
498 		resid = top->m_pkthdr.len;
499 	/*
500 	 * In theory resid should be unsigned.
501 	 * However, space must be signed, as it might be less than 0
502 	 * if we over-committed, and we must use a signed comparison
503 	 * of space and resid.  On the other hand, a negative resid
504 	 * causes us to loop sending 0-length segments to the protocol.
505 	 *
506 	 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
507 	 * type sockets since that's an error.
508 	 */
509 	if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
510 		error = EINVAL;
511 		goto out;
512 	}
513 
514 	dontroute =
515 	    (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
516 	    (so->so_proto->pr_flags & PR_ATOMIC);
517 	if (td->td_proc && td->td_proc->p_stats)
518 		td->td_proc->p_stats->p_ru.ru_msgsnd++;
519 	if (control)
520 		clen = control->m_len;
521 #define	gotoerr(errno)	{ error = errno; splx(s); goto release; }
522 
523 restart:
524 	error = sblock(&so->so_snd, SBLOCKWAIT(flags));
525 	if (error)
526 		goto out;
527 	do {
528 		s = splnet();
529 		if (so->so_state & SS_CANTSENDMORE)
530 			gotoerr(EPIPE);
531 		if (so->so_error) {
532 			error = so->so_error;
533 			so->so_error = 0;
534 			splx(s);
535 			goto release;
536 		}
537 		if ((so->so_state & SS_ISCONNECTED) == 0) {
538 			/*
539 			 * `sendto' and `sendmsg' is allowed on a connection-
540 			 * based socket if it supports implied connect.
541 			 * Return ENOTCONN if not connected and no address is
542 			 * supplied.
543 			 */
544 			if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
545 			    (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
546 				if ((so->so_state & SS_ISCONFIRMING) == 0 &&
547 				    !(resid == 0 && clen != 0))
548 					gotoerr(ENOTCONN);
549 			} else if (addr == 0)
550 			    gotoerr(so->so_proto->pr_flags & PR_CONNREQUIRED ?
551 				   ENOTCONN : EDESTADDRREQ);
552 		}
553 		space = sbspace(&so->so_snd);
554 		if (flags & MSG_OOB)
555 			space += 1024;
556 		if ((atomic && resid > so->so_snd.sb_hiwat) ||
557 		    clen > so->so_snd.sb_hiwat)
558 			gotoerr(EMSGSIZE);
559 		if (space < resid + clen && uio &&
560 		    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
561 			if (so->so_state & SS_NBIO)
562 				gotoerr(EWOULDBLOCK);
563 			sbunlock(&so->so_snd);
564 			error = sbwait(&so->so_snd);
565 			splx(s);
566 			if (error)
567 				goto out;
568 			goto restart;
569 		}
570 		splx(s);
571 		mp = &top;
572 		space -= clen;
573 		do {
574 		    if (uio == NULL) {
575 			/*
576 			 * Data is prepackaged in "top".
577 			 */
578 			resid = 0;
579 			if (flags & MSG_EOR)
580 				top->m_flags |= M_EOR;
581 		    } else do {
582 			if (top == 0) {
583 				MGETHDR(m, MB_WAIT, MT_DATA);
584 				if (m == NULL) {
585 					error = ENOBUFS;
586 					goto release;
587 				}
588 				mlen = MHLEN;
589 				m->m_pkthdr.len = 0;
590 				m->m_pkthdr.rcvif = (struct ifnet *)0;
591 			} else {
592 				MGET(m, MB_WAIT, MT_DATA);
593 				if (m == NULL) {
594 					error = ENOBUFS;
595 					goto release;
596 				}
597 				mlen = MLEN;
598 			}
599 			if (resid >= MINCLSIZE) {
600 				MCLGET(m, MB_WAIT);
601 				if ((m->m_flags & M_EXT) == 0)
602 					goto nopages;
603 				mlen = MCLBYTES;
604 				len = min(min(mlen, resid), space);
605 			} else {
606 nopages:
607 				len = min(min(mlen, resid), space);
608 				/*
609 				 * For datagram protocols, leave room
610 				 * for protocol headers in first mbuf.
611 				 */
612 				if (atomic && top == 0 && len < mlen)
613 					MH_ALIGN(m, len);
614 			}
615 			space -= len;
616 			error = uiomove(mtod(m, caddr_t), (int)len, uio);
617 			resid = uio->uio_resid;
618 			m->m_len = len;
619 			*mp = m;
620 			top->m_pkthdr.len += len;
621 			if (error)
622 				goto release;
623 			mp = &m->m_next;
624 			if (resid <= 0) {
625 				if (flags & MSG_EOR)
626 					top->m_flags |= M_EOR;
627 				break;
628 			}
629 		    } while (space > 0 && atomic);
630 		    if (dontroute)
631 			    so->so_options |= SO_DONTROUTE;
632 		    if (flags & MSG_OOB) {
633 		    	    pru_flags = PRUS_OOB;
634 		    } else if ((flags & MSG_EOF) &&
635 		    	       (so->so_proto->pr_flags & PR_IMPLOPCL) &&
636 		    	       (resid <= 0)) {
637 			    /*
638 			     * If the user set MSG_EOF, the protocol
639 			     * understands this flag and nothing left to
640 			     * send then use PRU_SEND_EOF instead of PRU_SEND.
641 			     */
642 		    	    pru_flags = PRUS_EOF;
643 		    } else if (resid > 0 && space > 0) {
644 			    /* If there is more to send, set PRUS_MORETOCOME */
645 		    	    pru_flags = PRUS_MORETOCOME;
646 		    } else {
647 		    	    pru_flags = 0;
648 		    }
649 		    s = splnet();				/* XXX */
650 		    /*
651 		     * XXX all the SS_CANTSENDMORE checks previously
652 		     * done could be out of date.  We could have recieved
653 		     * a reset packet in an interrupt or maybe we slept
654 		     * while doing page faults in uiomove() etc. We could
655 		     * probably recheck again inside the splnet() protection
656 		     * here, but there are probably other places that this
657 		     * also happens.  We must rethink this.
658 		     */
659 		    error = so_pru_send(so, pru_flags, top, addr, control, td);
660 		    splx(s);
661 		    if (dontroute)
662 			    so->so_options &= ~SO_DONTROUTE;
663 		    clen = 0;
664 		    control = 0;
665 		    top = 0;
666 		    mp = &top;
667 		    if (error)
668 			    goto release;
669 		} while (resid && space > 0);
670 	} while (resid);
671 
672 release:
673 	sbunlock(&so->so_snd);
674 out:
675 	if (top)
676 		m_freem(top);
677 	if (control)
678 		m_freem(control);
679 	return (error);
680 }
681 
682 /*
683  * A specialization of sosend() for UDP based on protocol-specific knowledge:
684  *   so->so_proto->pr_flags has the PR_ATOMIC field set.  This means that
685  *	sosendallatonce() returns true,
686  *	the "atomic" variable is true,
687  *	and sosendudp() blocks until space is available for the entire send.
688  *   so->so_proto->pr_flags does not have the PR_CONNREQUIRED or
689  *	PR_IMPLOPCL flags set.
690  *   UDP has no out-of-band data.
691  *   UDP has no control data.
692  *   UDP does not support MSG_EOR.
693  */
694 int
695 sosendudp(struct socket *so, struct sockaddr *addr, struct uio *uio,
696 	  struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
697 {
698 	int resid, error, s;
699 	boolean_t dontroute;		/* temporary SO_DONTROUTE setting */
700 
701 	if (td->td_proc && td->td_proc->p_stats)
702 		td->td_proc->p_stats->p_ru.ru_msgsnd++;
703 	if (control)
704 		m_freem(control);
705 
706 	KASSERT((uio && !top) || (top && !uio), ("bad arguments to sosendudp"));
707 	resid = uio ? uio->uio_resid : top->m_pkthdr.len;
708 
709 restart:
710 	error = sblock(&so->so_snd, SBLOCKWAIT(flags));
711 	if (error)
712 		goto out;
713 
714 	s = splnet();
715 	if (so->so_state & SS_CANTSENDMORE)
716 		gotoerr(EPIPE);
717 	if (so->so_error) {
718 		error = so->so_error;
719 		so->so_error = 0;
720 		splx(s);
721 		goto release;
722 	}
723 	if (!(so->so_state & SS_ISCONNECTED) && addr == NULL)
724 		gotoerr(EDESTADDRREQ);
725 	if (resid > so->so_snd.sb_hiwat)
726 		gotoerr(EMSGSIZE);
727 	if (uio && sbspace(&so->so_snd) < resid) {
728 		if (so->so_state & SS_NBIO)
729 			gotoerr(EWOULDBLOCK);
730 		sbunlock(&so->so_snd);
731 		error = sbwait(&so->so_snd);
732 		splx(s);
733 		if (error)
734 			goto out;
735 		goto restart;
736 	}
737 	splx(s);
738 
739 	if (uio) {
740 		top = m_uiomove(uio, MB_WAIT, 0);
741 		if (top == NULL)
742 			goto release;
743 	}
744 
745 	dontroute = (flags & MSG_DONTROUTE) && !(so->so_options & SO_DONTROUTE);
746 	if (dontroute)
747 		so->so_options |= SO_DONTROUTE;
748 
749 	error = so_pru_send(so, 0, top, addr, NULL, td);
750 	top = NULL;		/* sent or freed in lower layer */
751 
752 	if (dontroute)
753 		so->so_options &= ~SO_DONTROUTE;
754 
755 release:
756 	sbunlock(&so->so_snd);
757 out:
758 	if (top)
759 		m_freem(top);
760 	return (error);
761 }
762 
763 /*
764  * Implement receive operations on a socket.
765  * We depend on the way that records are added to the sockbuf
766  * by sbappend*.  In particular, each record (mbufs linked through m_next)
767  * must begin with an address if the protocol so specifies,
768  * followed by an optional mbuf or mbufs containing ancillary data,
769  * and then zero or more mbufs of data.
770  * In order to avoid blocking network interrupts for the entire time here,
771  * we splx() while doing the actual copy to user space.
772  * Although the sockbuf is locked, new data may still be appended,
773  * and thus we must maintain consistency of the sockbuf during that time.
774  *
775  * The caller may receive the data as a single mbuf chain by supplying
776  * an mbuf **mp0 for use in returning the chain.  The uio is then used
777  * only for the count in uio_resid.
778  */
779 int
780 soreceive(so, psa, uio, mp0, controlp, flagsp)
781 	struct socket *so;
782 	struct sockaddr **psa;
783 	struct uio *uio;
784 	struct mbuf **mp0;
785 	struct mbuf **controlp;
786 	int *flagsp;
787 {
788 	struct mbuf *m, **mp;
789 	int flags, len, error, s, offset;
790 	struct protosw *pr = so->so_proto;
791 	struct mbuf *nextrecord;
792 	int moff, type = 0;
793 	int orig_resid = uio->uio_resid;
794 
795 	mp = mp0;
796 	if (psa)
797 		*psa = 0;
798 	if (controlp)
799 		*controlp = 0;
800 	if (flagsp)
801 		flags = *flagsp &~ MSG_EOR;
802 	else
803 		flags = 0;
804 	if (flags & MSG_OOB) {
805 		m = m_get(MB_WAIT, MT_DATA);
806 		if (m == NULL)
807 			return (ENOBUFS);
808 		error = so_pru_rcvoob(so, m, flags & MSG_PEEK);
809 		if (error)
810 			goto bad;
811 		do {
812 			error = uiomove(mtod(m, caddr_t),
813 			    (int) min(uio->uio_resid, m->m_len), uio);
814 			m = m_free(m);
815 		} while (uio->uio_resid && error == 0 && m);
816 bad:
817 		if (m)
818 			m_freem(m);
819 		return (error);
820 	}
821 	if (mp)
822 		*mp = (struct mbuf *)0;
823 	if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
824 		so_pru_rcvd(so, 0);
825 
826 restart:
827 	error = sblock(&so->so_rcv, SBLOCKWAIT(flags));
828 	if (error)
829 		return (error);
830 	s = splnet();
831 
832 	m = so->so_rcv.sb_mb;
833 	/*
834 	 * If we have less data than requested, block awaiting more
835 	 * (subject to any timeout) if:
836 	 *   1. the current count is less than the low water mark, or
837 	 *   2. MSG_WAITALL is set, and it is possible to do the entire
838 	 *	receive operation at once if we block (resid <= hiwat).
839 	 *   3. MSG_DONTWAIT is not set
840 	 * If MSG_WAITALL is set but resid is larger than the receive buffer,
841 	 * we have to do the receive in sections, and thus risk returning
842 	 * a short count if a timeout or signal occurs after we start.
843 	 */
844 	if (m == 0 || (((flags & MSG_DONTWAIT) == 0 &&
845 	    so->so_rcv.sb_cc < uio->uio_resid) &&
846 	    (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
847 	    ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
848 	    m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) {
849 		KASSERT(m != 0 || !so->so_rcv.sb_cc, ("receive 1"));
850 		if (so->so_error) {
851 			if (m)
852 				goto dontblock;
853 			error = so->so_error;
854 			if ((flags & MSG_PEEK) == 0)
855 				so->so_error = 0;
856 			goto release;
857 		}
858 		if (so->so_state & SS_CANTRCVMORE) {
859 			if (m)
860 				goto dontblock;
861 			else
862 				goto release;
863 		}
864 		for (; m; m = m->m_next)
865 			if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
866 				m = so->so_rcv.sb_mb;
867 				goto dontblock;
868 			}
869 		if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
870 		    (pr->pr_flags & PR_CONNREQUIRED)) {
871 			error = ENOTCONN;
872 			goto release;
873 		}
874 		if (uio->uio_resid == 0)
875 			goto release;
876 		if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) {
877 			error = EWOULDBLOCK;
878 			goto release;
879 		}
880 		sbunlock(&so->so_rcv);
881 		error = sbwait(&so->so_rcv);
882 		splx(s);
883 		if (error)
884 			return (error);
885 		goto restart;
886 	}
887 dontblock:
888 	if (uio->uio_td && uio->uio_td->td_proc)
889 		uio->uio_td->td_proc->p_stats->p_ru.ru_msgrcv++;
890 	nextrecord = m->m_nextpkt;
891 	if (pr->pr_flags & PR_ADDR) {
892 		KASSERT(m->m_type == MT_SONAME, ("receive 1a"));
893 		orig_resid = 0;
894 		if (psa)
895 			*psa = dup_sockaddr(mtod(m, struct sockaddr *));
896 		if (flags & MSG_PEEK) {
897 			m = m->m_next;
898 		} else {
899 			sbfree(&so->so_rcv, m);
900 			so->so_rcv.sb_mb = m_free(m);
901 			m = so->so_rcv.sb_mb;
902 		}
903 	}
904 	while (m && m->m_type == MT_CONTROL && error == 0) {
905 		if (flags & MSG_PEEK) {
906 			if (controlp)
907 				*controlp = m_copy(m, 0, m->m_len);
908 			m = m->m_next;
909 		} else {
910 			sbfree(&so->so_rcv, m);
911 			if (controlp) {
912 				if (pr->pr_domain->dom_externalize &&
913 				    mtod(m, struct cmsghdr *)->cmsg_type ==
914 				    SCM_RIGHTS)
915 				   error = (*pr->pr_domain->dom_externalize)(m);
916 				*controlp = m;
917 				so->so_rcv.sb_mb = m->m_next;
918 				m->m_next = 0;
919 				m = so->so_rcv.sb_mb;
920 			} else {
921 				so->so_rcv.sb_mb = m_free(m);
922 				m = so->so_rcv.sb_mb;
923 			}
924 		}
925 		if (controlp) {
926 			orig_resid = 0;
927 			controlp = &(*controlp)->m_next;
928 		}
929 	}
930 	if (m) {
931 		if ((flags & MSG_PEEK) == 0)
932 			m->m_nextpkt = nextrecord;
933 		type = m->m_type;
934 		if (type == MT_OOBDATA)
935 			flags |= MSG_OOB;
936 	}
937 	moff = 0;
938 	offset = 0;
939 	while (m && uio->uio_resid > 0 && error == 0) {
940 		if (m->m_type == MT_OOBDATA) {
941 			if (type != MT_OOBDATA)
942 				break;
943 		} else if (type == MT_OOBDATA)
944 			break;
945 		else
946 		    KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER,
947 			("receive 3"));
948 		so->so_state &= ~SS_RCVATMARK;
949 		len = uio->uio_resid;
950 		if (so->so_oobmark && len > so->so_oobmark - offset)
951 			len = so->so_oobmark - offset;
952 		if (len > m->m_len - moff)
953 			len = m->m_len - moff;
954 		/*
955 		 * If mp is set, just pass back the mbufs.
956 		 * Otherwise copy them out via the uio, then free.
957 		 * Sockbuf must be consistent here (points to current mbuf,
958 		 * it points to next record) when we drop priority;
959 		 * we must note any additions to the sockbuf when we
960 		 * block interrupts again.
961 		 */
962 		if (mp == 0) {
963 			splx(s);
964 			error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio);
965 			s = splnet();
966 			if (error)
967 				goto release;
968 		} else
969 			uio->uio_resid -= len;
970 		if (len == m->m_len - moff) {
971 			if (m->m_flags & M_EOR)
972 				flags |= MSG_EOR;
973 			if (flags & MSG_PEEK) {
974 				m = m->m_next;
975 				moff = 0;
976 			} else {
977 				nextrecord = m->m_nextpkt;
978 				sbfree(&so->so_rcv, m);
979 				if (mp) {
980 					*mp = m;
981 					mp = &m->m_next;
982 					so->so_rcv.sb_mb = m = m->m_next;
983 					*mp = (struct mbuf *)0;
984 				} else {
985 					so->so_rcv.sb_mb = m = m_free(m);
986 				}
987 				if (m)
988 					m->m_nextpkt = nextrecord;
989 				else
990 					so->so_rcv.sb_lastmbuf = NULL;
991 			}
992 		} else {
993 			if (flags & MSG_PEEK)
994 				moff += len;
995 			else {
996 				if (mp)
997 					*mp = m_copym(m, 0, len, MB_WAIT);
998 				m->m_data += len;
999 				m->m_len -= len;
1000 				so->so_rcv.sb_cc -= len;
1001 			}
1002 		}
1003 		if (so->so_oobmark) {
1004 			if ((flags & MSG_PEEK) == 0) {
1005 				so->so_oobmark -= len;
1006 				if (so->so_oobmark == 0) {
1007 					so->so_state |= SS_RCVATMARK;
1008 					break;
1009 				}
1010 			} else {
1011 				offset += len;
1012 				if (offset == so->so_oobmark)
1013 					break;
1014 			}
1015 		}
1016 		if (flags & MSG_EOR)
1017 			break;
1018 		/*
1019 		 * If the MSG_WAITALL flag is set (for non-atomic socket),
1020 		 * we must not quit until "uio->uio_resid == 0" or an error
1021 		 * termination.  If a signal/timeout occurs, return
1022 		 * with a short count but without error.
1023 		 * Keep sockbuf locked against other readers.
1024 		 */
1025 		while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 &&
1026 		    !sosendallatonce(so) && !nextrecord) {
1027 			if (so->so_error || so->so_state & SS_CANTRCVMORE)
1028 				break;
1029 			/*
1030 			 * The window might have closed to zero, make
1031 			 * sure we send an ack now that we've drained
1032 			 * the buffer or we might end up blocking until
1033 			 * the idle takes over (5 seconds).
1034 			 */
1035 			if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1036 				so_pru_rcvd(so, flags);
1037 			error = sbwait(&so->so_rcv);
1038 			if (error) {
1039 				sbunlock(&so->so_rcv);
1040 				splx(s);
1041 				return (0);
1042 			}
1043 			m = so->so_rcv.sb_mb;
1044 			if (m)
1045 				nextrecord = m->m_nextpkt;
1046 		}
1047 	}
1048 
1049 	if (m && pr->pr_flags & PR_ATOMIC) {
1050 		flags |= MSG_TRUNC;
1051 		if ((flags & MSG_PEEK) == 0)
1052 			(void) sbdroprecord(&so->so_rcv);
1053 	}
1054 	if ((flags & MSG_PEEK) == 0) {
1055 		if (m == 0) {
1056 			so->so_rcv.sb_mb = nextrecord;
1057 			so->so_rcv.sb_lastmbuf = NULL;
1058 		}
1059 		if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1060 			so_pru_rcvd(so, flags);
1061 	}
1062 	if (orig_resid == uio->uio_resid && orig_resid &&
1063 	    (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1064 		sbunlock(&so->so_rcv);
1065 		splx(s);
1066 		goto restart;
1067 	}
1068 
1069 	if (flagsp)
1070 		*flagsp |= flags;
1071 release:
1072 	sbunlock(&so->so_rcv);
1073 	splx(s);
1074 	return (error);
1075 }
1076 
1077 int
1078 soshutdown(so, how)
1079 	struct socket *so;
1080 	int how;
1081 {
1082 	if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1083 		return (EINVAL);
1084 
1085 	if (how != SHUT_WR)
1086 		sorflush(so);
1087 	if (how != SHUT_RD)
1088 		return (so_pru_shutdown(so));
1089 	return (0);
1090 }
1091 
1092 void
1093 sorflush(so)
1094 	struct socket *so;
1095 {
1096 	struct sockbuf *sb = &so->so_rcv;
1097 	struct protosw *pr = so->so_proto;
1098 	int s;
1099 	struct sockbuf asb;
1100 
1101 	sb->sb_flags |= SB_NOINTR;
1102 	(void) sblock(sb, M_WAITOK);
1103 	s = splimp();
1104 	socantrcvmore(so);
1105 	sbunlock(sb);
1106 	asb = *sb;
1107 	bzero((caddr_t)sb, sizeof (*sb));
1108 	if (asb.sb_flags & SB_KNOTE) {
1109 		sb->sb_sel.si_note = asb.sb_sel.si_note;
1110 		sb->sb_flags = SB_KNOTE;
1111 	}
1112 	splx(s);
1113 	if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
1114 		(*pr->pr_domain->dom_dispose)(asb.sb_mb);
1115 	sbrelease(&asb, so);
1116 }
1117 
1118 #ifdef INET
1119 static int
1120 do_setopt_accept_filter(so, sopt)
1121 	struct	socket *so;
1122 	struct	sockopt *sopt;
1123 {
1124 	struct accept_filter_arg	*afap = NULL;
1125 	struct accept_filter	*afp;
1126 	struct so_accf	*af = so->so_accf;
1127 	int	error = 0;
1128 
1129 	/* do not set/remove accept filters on non listen sockets */
1130 	if ((so->so_options & SO_ACCEPTCONN) == 0) {
1131 		error = EINVAL;
1132 		goto out;
1133 	}
1134 
1135 	/* removing the filter */
1136 	if (sopt == NULL) {
1137 		if (af != NULL) {
1138 			if (af->so_accept_filter != NULL &&
1139 				af->so_accept_filter->accf_destroy != NULL) {
1140 				af->so_accept_filter->accf_destroy(so);
1141 			}
1142 			if (af->so_accept_filter_str != NULL) {
1143 				FREE(af->so_accept_filter_str, M_ACCF);
1144 			}
1145 			FREE(af, M_ACCF);
1146 			so->so_accf = NULL;
1147 		}
1148 		so->so_options &= ~SO_ACCEPTFILTER;
1149 		return (0);
1150 	}
1151 	/* adding a filter */
1152 	/* must remove previous filter first */
1153 	if (af != NULL) {
1154 		error = EINVAL;
1155 		goto out;
1156 	}
1157 	/* don't put large objects on the kernel stack */
1158 	MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), M_TEMP, M_WAITOK);
1159 	error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap);
1160 	afap->af_name[sizeof(afap->af_name)-1] = '\0';
1161 	afap->af_arg[sizeof(afap->af_arg)-1] = '\0';
1162 	if (error)
1163 		goto out;
1164 	afp = accept_filt_get(afap->af_name);
1165 	if (afp == NULL) {
1166 		error = ENOENT;
1167 		goto out;
1168 	}
1169 	MALLOC(af, struct so_accf *, sizeof(*af), M_ACCF, M_WAITOK);
1170 	bzero(af, sizeof(*af));
1171 	if (afp->accf_create != NULL) {
1172 		if (afap->af_name[0] != '\0') {
1173 			int len = strlen(afap->af_name) + 1;
1174 
1175 			MALLOC(af->so_accept_filter_str, char *, len, M_ACCF, M_WAITOK);
1176 			strcpy(af->so_accept_filter_str, afap->af_name);
1177 		}
1178 		af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg);
1179 		if (af->so_accept_filter_arg == NULL) {
1180 			FREE(af->so_accept_filter_str, M_ACCF);
1181 			FREE(af, M_ACCF);
1182 			so->so_accf = NULL;
1183 			error = EINVAL;
1184 			goto out;
1185 		}
1186 	}
1187 	af->so_accept_filter = afp;
1188 	so->so_accf = af;
1189 	so->so_options |= SO_ACCEPTFILTER;
1190 out:
1191 	if (afap != NULL)
1192 		FREE(afap, M_TEMP);
1193 	return (error);
1194 }
1195 #endif /* INET */
1196 
1197 /*
1198  * Perhaps this routine, and sooptcopyout(), below, ought to come in
1199  * an additional variant to handle the case where the option value needs
1200  * to be some kind of integer, but not a specific size.
1201  * In addition to their use here, these functions are also called by the
1202  * protocol-level pr_ctloutput() routines.
1203  */
1204 int
1205 sooptcopyin(sopt, buf, len, minlen)
1206 	struct	sockopt *sopt;
1207 	void	*buf;
1208 	size_t	len;
1209 	size_t	minlen;
1210 {
1211 	size_t	valsize;
1212 
1213 	/*
1214 	 * If the user gives us more than we wanted, we ignore it,
1215 	 * but if we don't get the minimum length the caller
1216 	 * wants, we return EINVAL.  On success, sopt->sopt_valsize
1217 	 * is set to however much we actually retrieved.
1218 	 */
1219 	if ((valsize = sopt->sopt_valsize) < minlen)
1220 		return EINVAL;
1221 	if (valsize > len)
1222 		sopt->sopt_valsize = valsize = len;
1223 
1224 	if (sopt->sopt_td != NULL)
1225 		return (copyin(sopt->sopt_val, buf, valsize));
1226 
1227 	bcopy(sopt->sopt_val, buf, valsize);
1228 	return 0;
1229 }
1230 
1231 int
1232 sosetopt(so, sopt)
1233 	struct socket *so;
1234 	struct sockopt *sopt;
1235 {
1236 	int	error, optval;
1237 	struct	linger l;
1238 	struct	timeval tv;
1239 	u_long  val;
1240 
1241 	error = 0;
1242 	if (sopt->sopt_level != SOL_SOCKET) {
1243 		if (so->so_proto && so->so_proto->pr_ctloutput) {
1244 			return (so_pr_ctloutput(so, sopt));
1245 		}
1246 		error = ENOPROTOOPT;
1247 	} else {
1248 		switch (sopt->sopt_name) {
1249 #ifdef INET
1250 		case SO_ACCEPTFILTER:
1251 			error = do_setopt_accept_filter(so, sopt);
1252 			if (error)
1253 				goto bad;
1254 			break;
1255 #endif /* INET */
1256 		case SO_LINGER:
1257 			error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
1258 			if (error)
1259 				goto bad;
1260 
1261 			so->so_linger = l.l_linger;
1262 			if (l.l_onoff)
1263 				so->so_options |= SO_LINGER;
1264 			else
1265 				so->so_options &= ~SO_LINGER;
1266 			break;
1267 
1268 		case SO_DEBUG:
1269 		case SO_KEEPALIVE:
1270 		case SO_DONTROUTE:
1271 		case SO_USELOOPBACK:
1272 		case SO_BROADCAST:
1273 		case SO_REUSEADDR:
1274 		case SO_REUSEPORT:
1275 		case SO_OOBINLINE:
1276 		case SO_TIMESTAMP:
1277 			error = sooptcopyin(sopt, &optval, sizeof optval,
1278 					    sizeof optval);
1279 			if (error)
1280 				goto bad;
1281 			if (optval)
1282 				so->so_options |= sopt->sopt_name;
1283 			else
1284 				so->so_options &= ~sopt->sopt_name;
1285 			break;
1286 
1287 		case SO_SNDBUF:
1288 		case SO_RCVBUF:
1289 		case SO_SNDLOWAT:
1290 		case SO_RCVLOWAT:
1291 			error = sooptcopyin(sopt, &optval, sizeof optval,
1292 					    sizeof optval);
1293 			if (error)
1294 				goto bad;
1295 
1296 			/*
1297 			 * Values < 1 make no sense for any of these
1298 			 * options, so disallow them.
1299 			 */
1300 			if (optval < 1) {
1301 				error = EINVAL;
1302 				goto bad;
1303 			}
1304 
1305 			switch (sopt->sopt_name) {
1306 			case SO_SNDBUF:
1307 			case SO_RCVBUF:
1308 				if (sbreserve(sopt->sopt_name == SO_SNDBUF ?
1309 				    &so->so_snd : &so->so_rcv, (u_long)optval,
1310 				    so,
1311 				    &curproc->p_rlimit[RLIMIT_SBSIZE]) == 0) {
1312 					error = ENOBUFS;
1313 					goto bad;
1314 				}
1315 				break;
1316 
1317 			/*
1318 			 * Make sure the low-water is never greater than
1319 			 * the high-water.
1320 			 */
1321 			case SO_SNDLOWAT:
1322 				so->so_snd.sb_lowat =
1323 				    (optval > so->so_snd.sb_hiwat) ?
1324 				    so->so_snd.sb_hiwat : optval;
1325 				break;
1326 			case SO_RCVLOWAT:
1327 				so->so_rcv.sb_lowat =
1328 				    (optval > so->so_rcv.sb_hiwat) ?
1329 				    so->so_rcv.sb_hiwat : optval;
1330 				break;
1331 			}
1332 			break;
1333 
1334 		case SO_SNDTIMEO:
1335 		case SO_RCVTIMEO:
1336 			error = sooptcopyin(sopt, &tv, sizeof tv,
1337 					    sizeof tv);
1338 			if (error)
1339 				goto bad;
1340 
1341 			/* assert(hz > 0); */
1342 			if (tv.tv_sec < 0 || tv.tv_sec > SHRT_MAX / hz ||
1343 			    tv.tv_usec < 0 || tv.tv_usec >= 1000000) {
1344 				error = EDOM;
1345 				goto bad;
1346 			}
1347 			/* assert(tick > 0); */
1348 			/* assert(ULONG_MAX - SHRT_MAX >= 1000000); */
1349 			val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick;
1350 			if (val > SHRT_MAX) {
1351 				error = EDOM;
1352 				goto bad;
1353 			}
1354 			if (val == 0 && tv.tv_usec != 0)
1355 				val = 1;
1356 
1357 			switch (sopt->sopt_name) {
1358 			case SO_SNDTIMEO:
1359 				so->so_snd.sb_timeo = val;
1360 				break;
1361 			case SO_RCVTIMEO:
1362 				so->so_rcv.sb_timeo = val;
1363 				break;
1364 			}
1365 			break;
1366 		default:
1367 			error = ENOPROTOOPT;
1368 			break;
1369 		}
1370 		if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
1371 			(void) so_pr_ctloutput(so, sopt);
1372 		}
1373 	}
1374 bad:
1375 	return (error);
1376 }
1377 
1378 /* Helper routine for getsockopt */
1379 int
1380 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
1381 {
1382 	int	error;
1383 	size_t	valsize;
1384 
1385 	error = 0;
1386 
1387 	/*
1388 	 * Documented get behavior is that we always return a value,
1389 	 * possibly truncated to fit in the user's buffer.
1390 	 * Traditional behavior is that we always tell the user
1391 	 * precisely how much we copied, rather than something useful
1392 	 * like the total amount we had available for her.
1393 	 * Note that this interface is not idempotent; the entire answer must
1394 	 * generated ahead of time.
1395 	 */
1396 	valsize = min(len, sopt->sopt_valsize);
1397 	sopt->sopt_valsize = valsize;
1398 	if (sopt->sopt_val != 0) {
1399 		if (sopt->sopt_td != NULL)
1400 			error = copyout(buf, sopt->sopt_val, valsize);
1401 		else
1402 			bcopy(buf, sopt->sopt_val, valsize);
1403 	}
1404 	return error;
1405 }
1406 
1407 int
1408 sogetopt(so, sopt)
1409 	struct socket *so;
1410 	struct sockopt *sopt;
1411 {
1412 	int	error, optval;
1413 	struct	linger l;
1414 	struct	timeval tv;
1415 #ifdef INET
1416 	struct accept_filter_arg *afap;
1417 #endif
1418 
1419 	error = 0;
1420 	if (sopt->sopt_level != SOL_SOCKET) {
1421 		if (so->so_proto && so->so_proto->pr_ctloutput) {
1422 			return (so_pr_ctloutput(so, sopt));
1423 		} else
1424 			return (ENOPROTOOPT);
1425 	} else {
1426 		switch (sopt->sopt_name) {
1427 #ifdef INET
1428 		case SO_ACCEPTFILTER:
1429 			if ((so->so_options & SO_ACCEPTCONN) == 0)
1430 				return (EINVAL);
1431 			MALLOC(afap, struct accept_filter_arg *, sizeof(*afap),
1432 				M_TEMP, M_WAITOK);
1433 			bzero(afap, sizeof(*afap));
1434 			if ((so->so_options & SO_ACCEPTFILTER) != 0) {
1435 				strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name);
1436 				if (so->so_accf->so_accept_filter_str != NULL)
1437 					strcpy(afap->af_arg, so->so_accf->so_accept_filter_str);
1438 			}
1439 			error = sooptcopyout(sopt, afap, sizeof(*afap));
1440 			FREE(afap, M_TEMP);
1441 			break;
1442 #endif /* INET */
1443 
1444 		case SO_LINGER:
1445 			l.l_onoff = so->so_options & SO_LINGER;
1446 			l.l_linger = so->so_linger;
1447 			error = sooptcopyout(sopt, &l, sizeof l);
1448 			break;
1449 
1450 		case SO_USELOOPBACK:
1451 		case SO_DONTROUTE:
1452 		case SO_DEBUG:
1453 		case SO_KEEPALIVE:
1454 		case SO_REUSEADDR:
1455 		case SO_REUSEPORT:
1456 		case SO_BROADCAST:
1457 		case SO_OOBINLINE:
1458 		case SO_TIMESTAMP:
1459 			optval = so->so_options & sopt->sopt_name;
1460 integer:
1461 			error = sooptcopyout(sopt, &optval, sizeof optval);
1462 			break;
1463 
1464 		case SO_TYPE:
1465 			optval = so->so_type;
1466 			goto integer;
1467 
1468 		case SO_ERROR:
1469 			optval = so->so_error;
1470 			so->so_error = 0;
1471 			goto integer;
1472 
1473 		case SO_SNDBUF:
1474 			optval = so->so_snd.sb_hiwat;
1475 			goto integer;
1476 
1477 		case SO_RCVBUF:
1478 			optval = so->so_rcv.sb_hiwat;
1479 			goto integer;
1480 
1481 		case SO_SNDLOWAT:
1482 			optval = so->so_snd.sb_lowat;
1483 			goto integer;
1484 
1485 		case SO_RCVLOWAT:
1486 			optval = so->so_rcv.sb_lowat;
1487 			goto integer;
1488 
1489 		case SO_SNDTIMEO:
1490 		case SO_RCVTIMEO:
1491 			optval = (sopt->sopt_name == SO_SNDTIMEO ?
1492 				  so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1493 
1494 			tv.tv_sec = optval / hz;
1495 			tv.tv_usec = (optval % hz) * tick;
1496 			error = sooptcopyout(sopt, &tv, sizeof tv);
1497 			break;
1498 
1499 		default:
1500 			error = ENOPROTOOPT;
1501 			break;
1502 		}
1503 		return (error);
1504 	}
1505 }
1506 
1507 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
1508 int
1509 soopt_getm(struct sockopt *sopt, struct mbuf **mp)
1510 {
1511 	struct mbuf *m, *m_prev;
1512 	int sopt_size = sopt->sopt_valsize;
1513 
1514 	MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_DATA);
1515 	if (m == 0)
1516 		return ENOBUFS;
1517 	if (sopt_size > MLEN) {
1518 		MCLGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT);
1519 		if ((m->m_flags & M_EXT) == 0) {
1520 			m_free(m);
1521 			return ENOBUFS;
1522 		}
1523 		m->m_len = min(MCLBYTES, sopt_size);
1524 	} else {
1525 		m->m_len = min(MLEN, sopt_size);
1526 	}
1527 	sopt_size -= m->m_len;
1528 	*mp = m;
1529 	m_prev = m;
1530 
1531 	while (sopt_size) {
1532 		MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_DATA);
1533 		if (m == 0) {
1534 			m_freem(*mp);
1535 			return ENOBUFS;
1536 		}
1537 		if (sopt_size > MLEN) {
1538 			MCLGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT);
1539 			if ((m->m_flags & M_EXT) == 0) {
1540 				m_freem(*mp);
1541 				return ENOBUFS;
1542 			}
1543 			m->m_len = min(MCLBYTES, sopt_size);
1544 		} else {
1545 			m->m_len = min(MLEN, sopt_size);
1546 		}
1547 		sopt_size -= m->m_len;
1548 		m_prev->m_next = m;
1549 		m_prev = m;
1550 	}
1551 	return 0;
1552 }
1553 
1554 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */
1555 int
1556 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
1557 {
1558 	struct mbuf *m0 = m;
1559 
1560 	if (sopt->sopt_val == NULL)
1561 		return 0;
1562 	while (m != NULL && sopt->sopt_valsize >= m->m_len) {
1563 		if (sopt->sopt_td != NULL) {
1564 			int error;
1565 
1566 			error = copyin(sopt->sopt_val, mtod(m, char *),
1567 				       m->m_len);
1568 			if (error != 0) {
1569 				m_freem(m0);
1570 				return(error);
1571 			}
1572 		} else
1573 			bcopy(sopt->sopt_val, mtod(m, char *), m->m_len);
1574 		sopt->sopt_valsize -= m->m_len;
1575 		sopt->sopt_val = (caddr_t)sopt->sopt_val + m->m_len;
1576 		m = m->m_next;
1577 	}
1578 	if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
1579 		panic("ip6_sooptmcopyin");
1580 	return 0;
1581 }
1582 
1583 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */
1584 int
1585 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
1586 {
1587 	struct mbuf *m0 = m;
1588 	size_t valsize = 0;
1589 
1590 	if (sopt->sopt_val == NULL)
1591 		return 0;
1592 	while (m != NULL && sopt->sopt_valsize >= m->m_len) {
1593 		if (sopt->sopt_td != NULL) {
1594 			int error;
1595 
1596 			error = copyout(mtod(m, char *), sopt->sopt_val,
1597 				       m->m_len);
1598 			if (error != 0) {
1599 				m_freem(m0);
1600 				return(error);
1601 			}
1602 		} else
1603 			bcopy(mtod(m, char *), sopt->sopt_val, m->m_len);
1604 	       sopt->sopt_valsize -= m->m_len;
1605 	       sopt->sopt_val = (caddr_t)sopt->sopt_val + m->m_len;
1606 	       valsize += m->m_len;
1607 	       m = m->m_next;
1608 	}
1609 	if (m != NULL) {
1610 		/* enough soopt buffer should be given from user-land */
1611 		m_freem(m0);
1612 		return(EINVAL);
1613 	}
1614 	sopt->sopt_valsize = valsize;
1615 	return 0;
1616 }
1617 
1618 void
1619 sohasoutofband(so)
1620 	struct socket *so;
1621 {
1622 	if (so->so_sigio != NULL)
1623 		pgsigio(so->so_sigio, SIGURG, 0);
1624 	selwakeup(&so->so_rcv.sb_sel);
1625 }
1626 
1627 int
1628 sopoll(struct socket *so, int events, struct ucred *cred, struct thread *td)
1629 {
1630 	int revents = 0;
1631 	int s = splnet();
1632 
1633 	if (events & (POLLIN | POLLRDNORM))
1634 		if (soreadable(so))
1635 			revents |= events & (POLLIN | POLLRDNORM);
1636 
1637 	if (events & POLLINIGNEOF)
1638 		if (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat ||
1639 			!TAILQ_EMPTY(&so->so_comp) || so->so_error)
1640 			revents |= POLLINIGNEOF;
1641 
1642 	if (events & (POLLOUT | POLLWRNORM))
1643 		if (sowriteable(so))
1644 			revents |= events & (POLLOUT | POLLWRNORM);
1645 
1646 	if (events & (POLLPRI | POLLRDBAND))
1647 		if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
1648 			revents |= events & (POLLPRI | POLLRDBAND);
1649 
1650 	if (revents == 0) {
1651 		if (events &
1652 			(POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM |
1653 			 POLLRDBAND)) {
1654 			selrecord(td, &so->so_rcv.sb_sel);
1655 			so->so_rcv.sb_flags |= SB_SEL;
1656 		}
1657 
1658 		if (events & (POLLOUT | POLLWRNORM)) {
1659 			selrecord(td, &so->so_snd.sb_sel);
1660 			so->so_snd.sb_flags |= SB_SEL;
1661 		}
1662 	}
1663 
1664 	splx(s);
1665 	return (revents);
1666 }
1667 
1668 int
1669 sokqfilter(struct file *fp, struct knote *kn)
1670 {
1671 	struct socket *so = (struct socket *)kn->kn_fp->f_data;
1672 	struct sockbuf *sb;
1673 	int s;
1674 
1675 	switch (kn->kn_filter) {
1676 	case EVFILT_READ:
1677 		if (so->so_options & SO_ACCEPTCONN)
1678 			kn->kn_fop = &solisten_filtops;
1679 		else
1680 			kn->kn_fop = &soread_filtops;
1681 		sb = &so->so_rcv;
1682 		break;
1683 	case EVFILT_WRITE:
1684 		kn->kn_fop = &sowrite_filtops;
1685 		sb = &so->so_snd;
1686 		break;
1687 	default:
1688 		return (1);
1689 	}
1690 
1691 	s = splnet();
1692 	SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext);
1693 	sb->sb_flags |= SB_KNOTE;
1694 	splx(s);
1695 	return (0);
1696 }
1697 
1698 static void
1699 filt_sordetach(struct knote *kn)
1700 {
1701 	struct socket *so = (struct socket *)kn->kn_fp->f_data;
1702 	int s = splnet();
1703 
1704 	SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext);
1705 	if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note))
1706 		so->so_rcv.sb_flags &= ~SB_KNOTE;
1707 	splx(s);
1708 }
1709 
1710 /*ARGSUSED*/
1711 static int
1712 filt_soread(struct knote *kn, long hint)
1713 {
1714 	struct socket *so = (struct socket *)kn->kn_fp->f_data;
1715 
1716 	kn->kn_data = so->so_rcv.sb_cc;
1717 	if (so->so_state & SS_CANTRCVMORE) {
1718 		kn->kn_flags |= EV_EOF;
1719 		kn->kn_fflags = so->so_error;
1720 		return (1);
1721 	}
1722 	if (so->so_error)	/* temporary udp error */
1723 		return (1);
1724 	if (kn->kn_sfflags & NOTE_LOWAT)
1725 		return (kn->kn_data >= kn->kn_sdata);
1726 	return (kn->kn_data >= so->so_rcv.sb_lowat);
1727 }
1728 
1729 static void
1730 filt_sowdetach(struct knote *kn)
1731 {
1732 	struct socket *so = (struct socket *)kn->kn_fp->f_data;
1733 	int s = splnet();
1734 
1735 	SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext);
1736 	if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note))
1737 		so->so_snd.sb_flags &= ~SB_KNOTE;
1738 	splx(s);
1739 }
1740 
1741 /*ARGSUSED*/
1742 static int
1743 filt_sowrite(struct knote *kn, long hint)
1744 {
1745 	struct socket *so = (struct socket *)kn->kn_fp->f_data;
1746 
1747 	kn->kn_data = sbspace(&so->so_snd);
1748 	if (so->so_state & SS_CANTSENDMORE) {
1749 		kn->kn_flags |= EV_EOF;
1750 		kn->kn_fflags = so->so_error;
1751 		return (1);
1752 	}
1753 	if (so->so_error)	/* temporary udp error */
1754 		return (1);
1755 	if (((so->so_state & SS_ISCONNECTED) == 0) &&
1756 	    (so->so_proto->pr_flags & PR_CONNREQUIRED))
1757 		return (0);
1758 	if (kn->kn_sfflags & NOTE_LOWAT)
1759 		return (kn->kn_data >= kn->kn_sdata);
1760 	return (kn->kn_data >= so->so_snd.sb_lowat);
1761 }
1762 
1763 /*ARGSUSED*/
1764 static int
1765 filt_solisten(struct knote *kn, long hint)
1766 {
1767 	struct socket *so = (struct socket *)kn->kn_fp->f_data;
1768 
1769 	kn->kn_data = so->so_qlen;
1770 	return (! TAILQ_EMPTY(&so->so_comp));
1771 }
1772