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1.17 ! cgd 1: /* $NetBSD: uipc_socket.c,v 1.16 1994/06/29 06:33:37 cgd Exp $ */
1.16 cgd 2:
1.1 cgd 3: /*
1.15 mycroft 4: * Copyright (c) 1982, 1986, 1988, 1990, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
1.16 cgd 35: * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
1.1 cgd 36: */
37:
1.9 mycroft 38: #include <sys/param.h>
39: #include <sys/systm.h>
40: #include <sys/proc.h>
41: #include <sys/file.h>
42: #include <sys/malloc.h>
43: #include <sys/mbuf.h>
44: #include <sys/domain.h>
45: #include <sys/kernel.h>
46: #include <sys/protosw.h>
47: #include <sys/socket.h>
48: #include <sys/socketvar.h>
49: #include <sys/resourcevar.h>
1.1 cgd 50:
51: /*
52: * Socket operation routines.
53: * These routines are called by the routines in
54: * sys_socket.c or from a system process, and
55: * implement the semantics of socket operations by
56: * switching out to the protocol specific routines.
57: */
58: /*ARGSUSED*/
1.3 andrew 59: int
1.1 cgd 60: socreate(dom, aso, type, proto)
1.11 mycroft 61: int dom;
1.1 cgd 62: struct socket **aso;
63: register int type;
64: int proto;
65: {
66: struct proc *p = curproc; /* XXX */
67: register struct protosw *prp;
68: register struct socket *so;
69: register int error;
70:
71: if (proto)
72: prp = pffindproto(dom, proto, type);
73: else
74: prp = pffindtype(dom, type);
1.15 mycroft 75: if (prp == 0 || prp->pr_usrreq == 0)
1.1 cgd 76: return (EPROTONOSUPPORT);
77: if (prp->pr_type != type)
78: return (EPROTOTYPE);
79: MALLOC(so, struct socket *, sizeof(*so), M_SOCKET, M_WAIT);
80: bzero((caddr_t)so, sizeof(*so));
81: so->so_type = type;
82: if (p->p_ucred->cr_uid == 0)
83: so->so_state = SS_PRIV;
84: so->so_proto = prp;
85: error =
1.17 ! cgd 86: (*prp->pr_usrreq)(so, PRU_ATTACH, (struct mbuf *)0,
! 87: (struct mbuf *)(long)proto, (struct mbuf *)0);
1.1 cgd 88: if (error) {
89: so->so_state |= SS_NOFDREF;
90: sofree(so);
91: return (error);
92: }
1.10 deraadt 93: #ifdef COMPAT_SUNOS
94: if (p->p_emul == EMUL_SUNOS && type == SOCK_DGRAM)
95: so->so_options |= SO_BROADCAST;
96: #endif
1.1 cgd 97: *aso = so;
98: return (0);
99: }
100:
1.3 andrew 101: int
1.1 cgd 102: sobind(so, nam)
103: struct socket *so;
104: struct mbuf *nam;
105: {
106: int s = splnet();
107: int error;
108:
109: error =
110: (*so->so_proto->pr_usrreq)(so, PRU_BIND,
111: (struct mbuf *)0, nam, (struct mbuf *)0);
112: splx(s);
113: return (error);
114: }
115:
1.3 andrew 116: int
1.1 cgd 117: solisten(so, backlog)
118: register struct socket *so;
119: int backlog;
120: {
121: int s = splnet(), error;
122:
123: error =
124: (*so->so_proto->pr_usrreq)(so, PRU_LISTEN,
125: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0);
126: if (error) {
127: splx(s);
128: return (error);
129: }
130: if (so->so_q == 0)
131: so->so_options |= SO_ACCEPTCONN;
132: if (backlog < 0)
133: backlog = 0;
134: so->so_qlimit = min(backlog, SOMAXCONN);
135: splx(s);
136: return (0);
137: }
138:
1.3 andrew 139: int
1.1 cgd 140: sofree(so)
141: register struct socket *so;
142: {
143:
144: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
145: return;
146: if (so->so_head) {
147: if (!soqremque(so, 0) && !soqremque(so, 1))
148: panic("sofree dq");
149: so->so_head = 0;
150: }
151: sbrelease(&so->so_snd);
152: sorflush(so);
153: FREE(so, M_SOCKET);
154: }
155:
156: /*
157: * Close a socket on last file table reference removal.
158: * Initiate disconnect if connected.
159: * Free socket when disconnect complete.
160: */
1.3 andrew 161: int
1.1 cgd 162: soclose(so)
163: register struct socket *so;
164: {
165: int s = splnet(); /* conservative */
166: int error = 0;
167:
168: if (so->so_options & SO_ACCEPTCONN) {
169: while (so->so_q0)
170: (void) soabort(so->so_q0);
171: while (so->so_q)
172: (void) soabort(so->so_q);
173: }
174: if (so->so_pcb == 0)
175: goto discard;
176: if (so->so_state & SS_ISCONNECTED) {
177: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
178: error = sodisconnect(so);
179: if (error)
180: goto drop;
181: }
182: if (so->so_options & SO_LINGER) {
183: if ((so->so_state & SS_ISDISCONNECTING) &&
184: (so->so_state & SS_NBIO))
185: goto drop;
186: while (so->so_state & SS_ISCONNECTED)
187: if (error = tsleep((caddr_t)&so->so_timeo,
188: PSOCK | PCATCH, netcls, so->so_linger))
189: break;
190: }
191: }
192: drop:
193: if (so->so_pcb) {
194: int error2 =
195: (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
196: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0);
197: if (error == 0)
198: error = error2;
199: }
200: discard:
201: if (so->so_state & SS_NOFDREF)
202: panic("soclose: NOFDREF");
203: so->so_state |= SS_NOFDREF;
204: sofree(so);
205: splx(s);
206: return (error);
207: }
208:
209: /*
210: * Must be called at splnet...
211: */
1.3 andrew 212: int
1.1 cgd 213: soabort(so)
214: struct socket *so;
215: {
216:
217: return (
218: (*so->so_proto->pr_usrreq)(so, PRU_ABORT,
219: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0));
220: }
221:
1.3 andrew 222: int
1.1 cgd 223: soaccept(so, nam)
224: register struct socket *so;
225: struct mbuf *nam;
226: {
227: int s = splnet();
228: int error;
229:
230: if ((so->so_state & SS_NOFDREF) == 0)
231: panic("soaccept: !NOFDREF");
232: so->so_state &= ~SS_NOFDREF;
233: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
234: (struct mbuf *)0, nam, (struct mbuf *)0);
235: splx(s);
236: return (error);
237: }
238:
1.3 andrew 239: int
1.1 cgd 240: soconnect(so, nam)
241: register struct socket *so;
242: struct mbuf *nam;
243: {
244: int s;
245: int error;
246:
247: if (so->so_options & SO_ACCEPTCONN)
248: return (EOPNOTSUPP);
249: s = splnet();
250: /*
251: * If protocol is connection-based, can only connect once.
252: * Otherwise, if connected, try to disconnect first.
253: * This allows user to disconnect by connecting to, e.g.,
254: * a null address.
255: */
256: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
257: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
258: (error = sodisconnect(so))))
259: error = EISCONN;
260: else
261: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
262: (struct mbuf *)0, nam, (struct mbuf *)0);
263: splx(s);
264: return (error);
265: }
266:
1.3 andrew 267: int
1.1 cgd 268: soconnect2(so1, so2)
269: register struct socket *so1;
270: struct socket *so2;
271: {
272: int s = splnet();
273: int error;
274:
275: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
276: (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0);
277: splx(s);
278: return (error);
279: }
280:
1.3 andrew 281: int
1.1 cgd 282: sodisconnect(so)
283: register struct socket *so;
284: {
285: int s = splnet();
286: int error;
287:
288: if ((so->so_state & SS_ISCONNECTED) == 0) {
289: error = ENOTCONN;
290: goto bad;
291: }
292: if (so->so_state & SS_ISDISCONNECTING) {
293: error = EALREADY;
294: goto bad;
295: }
296: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
297: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0);
298: bad:
299: splx(s);
300: return (error);
301: }
302:
1.15 mycroft 303: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 304: /*
305: * Send on a socket.
306: * If send must go all at once and message is larger than
307: * send buffering, then hard error.
308: * Lock against other senders.
309: * If must go all at once and not enough room now, then
310: * inform user that this would block and do nothing.
311: * Otherwise, if nonblocking, send as much as possible.
312: * The data to be sent is described by "uio" if nonzero,
313: * otherwise by the mbuf chain "top" (which must be null
314: * if uio is not). Data provided in mbuf chain must be small
315: * enough to send all at once.
316: *
317: * Returns nonzero on error, timeout or signal; callers
318: * must check for short counts if EINTR/ERESTART are returned.
319: * Data and control buffers are freed on return.
320: */
1.3 andrew 321: int
1.1 cgd 322: sosend(so, addr, uio, top, control, flags)
323: register struct socket *so;
324: struct mbuf *addr;
325: struct uio *uio;
326: struct mbuf *top;
327: struct mbuf *control;
328: int flags;
329: {
1.15 mycroft 330: struct proc *p = curproc; /* XXX */
1.1 cgd 331: struct mbuf **mp;
332: register struct mbuf *m;
333: register long space, len, resid;
334: int clen = 0, error, s, dontroute, mlen;
335: int atomic = sosendallatonce(so) || top;
336:
337: if (uio)
338: resid = uio->uio_resid;
339: else
340: resid = top->m_pkthdr.len;
1.7 cgd 341: /*
342: * In theory resid should be unsigned.
343: * However, space must be signed, as it might be less than 0
344: * if we over-committed, and we must use a signed comparison
345: * of space and resid. On the other hand, a negative resid
346: * causes us to loop sending 0-length segments to the protocol.
347: */
348: if (resid < 0)
349: return (EINVAL);
1.1 cgd 350: dontroute =
351: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
352: (so->so_proto->pr_flags & PR_ATOMIC);
1.12 mycroft 353: p->p_stats->p_ru.ru_msgsnd++;
1.1 cgd 354: if (control)
355: clen = control->m_len;
356: #define snderr(errno) { error = errno; splx(s); goto release; }
357:
358: restart:
1.15 mycroft 359: if (error = sblock(&so->so_snd, SBLOCKWAIT(flags)))
1.1 cgd 360: goto out;
361: do {
362: s = splnet();
363: if (so->so_state & SS_CANTSENDMORE)
364: snderr(EPIPE);
365: if (so->so_error)
366: snderr(so->so_error);
367: if ((so->so_state & SS_ISCONNECTED) == 0) {
368: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
369: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
370: !(resid == 0 && clen != 0))
371: snderr(ENOTCONN);
372: } else if (addr == 0)
373: snderr(EDESTADDRREQ);
374: }
375: space = sbspace(&so->so_snd);
376: if (flags & MSG_OOB)
377: space += 1024;
1.11 mycroft 378: if (atomic && resid > so->so_snd.sb_hiwat ||
379: clen > so->so_snd.sb_hiwat)
380: snderr(EMSGSIZE);
381: if (space < resid + clen && uio &&
1.1 cgd 382: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
383: if (so->so_state & SS_NBIO)
384: snderr(EWOULDBLOCK);
385: sbunlock(&so->so_snd);
386: error = sbwait(&so->so_snd);
387: splx(s);
388: if (error)
389: goto out;
390: goto restart;
391: }
392: splx(s);
393: mp = ⊤
394: space -= clen;
395: do {
396: if (uio == NULL) {
397: /*
398: * Data is prepackaged in "top".
399: */
400: resid = 0;
401: if (flags & MSG_EOR)
402: top->m_flags |= M_EOR;
403: } else do {
404: if (top == 0) {
405: MGETHDR(m, M_WAIT, MT_DATA);
406: mlen = MHLEN;
407: m->m_pkthdr.len = 0;
408: m->m_pkthdr.rcvif = (struct ifnet *)0;
409: } else {
410: MGET(m, M_WAIT, MT_DATA);
411: mlen = MLEN;
412: }
1.15 mycroft 413: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.1 cgd 414: MCLGET(m, M_WAIT);
415: if ((m->m_flags & M_EXT) == 0)
416: goto nopages;
417: mlen = MCLBYTES;
1.15 mycroft 418: #ifdef MAPPED_MBUFS
419: len = min(MCLBYTES, resid);
420: #else
421: if (atomic && top == 0) {
422: len = min(MCLBYTES - max_hdr, resid);
423: m->m_data += max_hdr;
424: } else
425: len = min(MCLBYTES, resid);
426: #endif
427: space -= MCLBYTES;
1.1 cgd 428: } else {
429: nopages:
430: len = min(min(mlen, resid), space);
1.15 mycroft 431: space -= len;
1.1 cgd 432: /*
433: * For datagram protocols, leave room
434: * for protocol headers in first mbuf.
435: */
436: if (atomic && top == 0 && len < mlen)
437: MH_ALIGN(m, len);
438: }
439: error = uiomove(mtod(m, caddr_t), (int)len, uio);
440: resid = uio->uio_resid;
441: m->m_len = len;
442: *mp = m;
443: top->m_pkthdr.len += len;
444: if (error)
445: goto release;
446: mp = &m->m_next;
447: if (resid <= 0) {
448: if (flags & MSG_EOR)
449: top->m_flags |= M_EOR;
450: break;
451: }
452: } while (space > 0 && atomic);
453: if (dontroute)
454: so->so_options |= SO_DONTROUTE;
455: s = splnet(); /* XXX */
456: error = (*so->so_proto->pr_usrreq)(so,
457: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
458: top, addr, control);
459: splx(s);
460: if (dontroute)
461: so->so_options &= ~SO_DONTROUTE;
462: clen = 0;
463: control = 0;
464: top = 0;
465: mp = ⊤
466: if (error)
467: goto release;
468: } while (resid && space > 0);
469: } while (resid);
470:
471: release:
472: sbunlock(&so->so_snd);
473: out:
474: if (top)
475: m_freem(top);
476: if (control)
477: m_freem(control);
478: return (error);
479: }
480:
481: /*
482: * Implement receive operations on a socket.
483: * We depend on the way that records are added to the sockbuf
484: * by sbappend*. In particular, each record (mbufs linked through m_next)
485: * must begin with an address if the protocol so specifies,
486: * followed by an optional mbuf or mbufs containing ancillary data,
487: * and then zero or more mbufs of data.
488: * In order to avoid blocking network interrupts for the entire time here,
489: * we splx() while doing the actual copy to user space.
490: * Although the sockbuf is locked, new data may still be appended,
491: * and thus we must maintain consistency of the sockbuf during that time.
492: *
493: * The caller may receive the data as a single mbuf chain by supplying
494: * an mbuf **mp0 for use in returning the chain. The uio is then used
495: * only for the count in uio_resid.
496: */
1.3 andrew 497: int
1.1 cgd 498: soreceive(so, paddr, uio, mp0, controlp, flagsp)
499: register struct socket *so;
500: struct mbuf **paddr;
501: struct uio *uio;
502: struct mbuf **mp0;
503: struct mbuf **controlp;
504: int *flagsp;
505: {
506: register struct mbuf *m, **mp;
507: register int flags, len, error, s, offset;
508: struct protosw *pr = so->so_proto;
509: struct mbuf *nextrecord;
510: int moff, type;
1.3 andrew 511: int orig_resid = uio->uio_resid;
1.1 cgd 512:
513: mp = mp0;
514: if (paddr)
515: *paddr = 0;
516: if (controlp)
517: *controlp = 0;
518: if (flagsp)
519: flags = *flagsp &~ MSG_EOR;
520: else
521: flags = 0;
522: if (flags & MSG_OOB) {
523: m = m_get(M_WAIT, MT_DATA);
1.17 ! cgd 524: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
! 525: (struct mbuf *)(long)(flags & MSG_PEEK), (struct mbuf *)0);
1.1 cgd 526: if (error)
527: goto bad;
528: do {
529: error = uiomove(mtod(m, caddr_t),
530: (int) min(uio->uio_resid, m->m_len), uio);
531: m = m_free(m);
532: } while (uio->uio_resid && error == 0 && m);
533: bad:
534: if (m)
535: m_freem(m);
536: return (error);
537: }
538: if (mp)
539: *mp = (struct mbuf *)0;
540: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
541: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
542: (struct mbuf *)0, (struct mbuf *)0);
543:
544: restart:
1.15 mycroft 545: if (error = sblock(&so->so_rcv, SBLOCKWAIT(flags)))
1.1 cgd 546: return (error);
547: s = splnet();
548:
549: m = so->so_rcv.sb_mb;
550: /*
551: * If we have less data than requested, block awaiting more
552: * (subject to any timeout) if:
1.15 mycroft 553: * 1. the current count is less than the low water mark,
1.1 cgd 554: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 555: * receive operation at once if we block (resid <= hiwat), or
556: * 3. MSG_DONTWAIT is not set.
1.1 cgd 557: * If MSG_WAITALL is set but resid is larger than the receive buffer,
558: * we have to do the receive in sections, and thus risk returning
559: * a short count if a timeout or signal occurs after we start.
560: */
1.15 mycroft 561: if (m == 0 || ((flags & MSG_DONTWAIT) == 0 &&
562: so->so_rcv.sb_cc < uio->uio_resid) &&
1.1 cgd 563: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
564: ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.3 andrew 565: m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0) {
1.1 cgd 566: #ifdef DIAGNOSTIC
567: if (m == 0 && so->so_rcv.sb_cc)
568: panic("receive 1");
569: #endif
570: if (so->so_error) {
571: if (m)
1.15 mycroft 572: goto dontblock;
1.1 cgd 573: error = so->so_error;
574: if ((flags & MSG_PEEK) == 0)
575: so->so_error = 0;
576: goto release;
577: }
578: if (so->so_state & SS_CANTRCVMORE) {
579: if (m)
1.15 mycroft 580: goto dontblock;
1.1 cgd 581: else
582: goto release;
583: }
584: for (; m; m = m->m_next)
585: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
586: m = so->so_rcv.sb_mb;
587: goto dontblock;
588: }
589: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
590: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
591: error = ENOTCONN;
592: goto release;
593: }
594: if (uio->uio_resid == 0)
595: goto release;
1.15 mycroft 596: if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) {
1.1 cgd 597: error = EWOULDBLOCK;
598: goto release;
599: }
600: sbunlock(&so->so_rcv);
601: error = sbwait(&so->so_rcv);
602: splx(s);
603: if (error)
604: return (error);
605: goto restart;
606: }
607: dontblock:
1.15 mycroft 608: #ifdef notyet /* XXXX */
609: if (uio->uio_procp)
610: uio->uio_procp->p_stats->p_ru.ru_msgrcv++;
611: #endif
1.1 cgd 612: nextrecord = m->m_nextpkt;
613: if (pr->pr_flags & PR_ADDR) {
614: #ifdef DIAGNOSTIC
615: if (m->m_type != MT_SONAME)
616: panic("receive 1a");
617: #endif
1.3 andrew 618: orig_resid = 0;
1.1 cgd 619: if (flags & MSG_PEEK) {
620: if (paddr)
621: *paddr = m_copy(m, 0, m->m_len);
622: m = m->m_next;
623: } else {
624: sbfree(&so->so_rcv, m);
625: if (paddr) {
626: *paddr = m;
627: so->so_rcv.sb_mb = m->m_next;
628: m->m_next = 0;
629: m = so->so_rcv.sb_mb;
630: } else {
631: MFREE(m, so->so_rcv.sb_mb);
632: m = so->so_rcv.sb_mb;
633: }
634: }
635: }
636: while (m && m->m_type == MT_CONTROL && error == 0) {
637: if (flags & MSG_PEEK) {
638: if (controlp)
639: *controlp = m_copy(m, 0, m->m_len);
640: m = m->m_next;
641: } else {
642: sbfree(&so->so_rcv, m);
643: if (controlp) {
644: if (pr->pr_domain->dom_externalize &&
645: mtod(m, struct cmsghdr *)->cmsg_type ==
646: SCM_RIGHTS)
647: error = (*pr->pr_domain->dom_externalize)(m);
648: *controlp = m;
649: so->so_rcv.sb_mb = m->m_next;
650: m->m_next = 0;
651: m = so->so_rcv.sb_mb;
652: } else {
653: MFREE(m, so->so_rcv.sb_mb);
654: m = so->so_rcv.sb_mb;
655: }
656: }
1.3 andrew 657: if (controlp) {
658: orig_resid = 0;
1.1 cgd 659: controlp = &(*controlp)->m_next;
1.3 andrew 660: }
1.1 cgd 661: }
662: if (m) {
663: if ((flags & MSG_PEEK) == 0)
664: m->m_nextpkt = nextrecord;
665: type = m->m_type;
666: if (type == MT_OOBDATA)
667: flags |= MSG_OOB;
668: }
669: moff = 0;
670: offset = 0;
671: while (m && uio->uio_resid > 0 && error == 0) {
672: if (m->m_type == MT_OOBDATA) {
673: if (type != MT_OOBDATA)
674: break;
675: } else if (type == MT_OOBDATA)
676: break;
677: #ifdef DIAGNOSTIC
678: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
679: panic("receive 3");
680: #endif
681: so->so_state &= ~SS_RCVATMARK;
682: len = uio->uio_resid;
683: if (so->so_oobmark && len > so->so_oobmark - offset)
684: len = so->so_oobmark - offset;
685: if (len > m->m_len - moff)
686: len = m->m_len - moff;
687: /*
688: * If mp is set, just pass back the mbufs.
689: * Otherwise copy them out via the uio, then free.
690: * Sockbuf must be consistent here (points to current mbuf,
691: * it points to next record) when we drop priority;
692: * we must note any additions to the sockbuf when we
693: * block interrupts again.
694: */
695: if (mp == 0) {
696: splx(s);
697: error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio);
698: s = splnet();
699: } else
700: uio->uio_resid -= len;
701: if (len == m->m_len - moff) {
702: if (m->m_flags & M_EOR)
703: flags |= MSG_EOR;
704: if (flags & MSG_PEEK) {
705: m = m->m_next;
706: moff = 0;
707: } else {
708: nextrecord = m->m_nextpkt;
709: sbfree(&so->so_rcv, m);
710: if (mp) {
711: *mp = m;
712: mp = &m->m_next;
713: so->so_rcv.sb_mb = m = m->m_next;
714: *mp = (struct mbuf *)0;
715: } else {
716: MFREE(m, so->so_rcv.sb_mb);
717: m = so->so_rcv.sb_mb;
718: }
719: if (m)
720: m->m_nextpkt = nextrecord;
721: }
722: } else {
723: if (flags & MSG_PEEK)
724: moff += len;
725: else {
726: if (mp)
727: *mp = m_copym(m, 0, len, M_WAIT);
728: m->m_data += len;
729: m->m_len -= len;
730: so->so_rcv.sb_cc -= len;
731: }
732: }
733: if (so->so_oobmark) {
734: if ((flags & MSG_PEEK) == 0) {
735: so->so_oobmark -= len;
736: if (so->so_oobmark == 0) {
737: so->so_state |= SS_RCVATMARK;
738: break;
739: }
1.7 cgd 740: } else {
1.1 cgd 741: offset += len;
1.7 cgd 742: if (offset == so->so_oobmark)
743: break;
744: }
1.1 cgd 745: }
746: if (flags & MSG_EOR)
747: break;
748: /*
749: * If the MSG_WAITALL flag is set (for non-atomic socket),
750: * we must not quit until "uio->uio_resid == 0" or an error
751: * termination. If a signal/timeout occurs, return
752: * with a short count but without error.
753: * Keep sockbuf locked against other readers.
754: */
755: while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 &&
1.3 andrew 756: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 757: if (so->so_error || so->so_state & SS_CANTRCVMORE)
758: break;
759: error = sbwait(&so->so_rcv);
760: if (error) {
761: sbunlock(&so->so_rcv);
762: splx(s);
763: return (0);
764: }
765: if (m = so->so_rcv.sb_mb)
766: nextrecord = m->m_nextpkt;
767: }
768: }
1.3 andrew 769:
770: if (m && pr->pr_flags & PR_ATOMIC) {
771: flags |= MSG_TRUNC;
772: if ((flags & MSG_PEEK) == 0)
773: (void) sbdroprecord(&so->so_rcv);
774: }
1.1 cgd 775: if ((flags & MSG_PEEK) == 0) {
776: if (m == 0)
777: so->so_rcv.sb_mb = nextrecord;
778: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
779: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
1.17 ! cgd 780: (struct mbuf *)(long)flags, (struct mbuf *)0,
1.1 cgd 781: (struct mbuf *)0);
782: }
1.3 andrew 783: if (orig_resid == uio->uio_resid && orig_resid &&
784: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
785: sbunlock(&so->so_rcv);
786: splx(s);
787: goto restart;
788: }
789:
1.1 cgd 790: if (flagsp)
791: *flagsp |= flags;
792: release:
793: sbunlock(&so->so_rcv);
794: splx(s);
795: return (error);
796: }
797:
1.14 mycroft 798: int
1.1 cgd 799: soshutdown(so, how)
800: register struct socket *so;
801: register int how;
802: {
803: register struct protosw *pr = so->so_proto;
804:
805: how++;
806: if (how & FREAD)
807: sorflush(so);
808: if (how & FWRITE)
809: return ((*pr->pr_usrreq)(so, PRU_SHUTDOWN,
810: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0));
811: return (0);
812: }
813:
1.14 mycroft 814: void
1.1 cgd 815: sorflush(so)
816: register struct socket *so;
817: {
818: register struct sockbuf *sb = &so->so_rcv;
819: register struct protosw *pr = so->so_proto;
820: register int s;
821: struct sockbuf asb;
822:
823: sb->sb_flags |= SB_NOINTR;
1.15 mycroft 824: (void) sblock(sb, M_WAITOK);
1.1 cgd 825: s = splimp();
826: socantrcvmore(so);
827: sbunlock(sb);
828: asb = *sb;
829: bzero((caddr_t)sb, sizeof (*sb));
830: splx(s);
831: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
832: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
833: sbrelease(&asb);
834: }
835:
1.14 mycroft 836: int
1.1 cgd 837: sosetopt(so, level, optname, m0)
838: register struct socket *so;
839: int level, optname;
840: struct mbuf *m0;
841: {
842: int error = 0;
843: register struct mbuf *m = m0;
844:
845: if (level != SOL_SOCKET) {
846: if (so->so_proto && so->so_proto->pr_ctloutput)
847: return ((*so->so_proto->pr_ctloutput)
848: (PRCO_SETOPT, so, level, optname, &m0));
849: error = ENOPROTOOPT;
850: } else {
851: switch (optname) {
852:
853: case SO_LINGER:
854: if (m == NULL || m->m_len != sizeof (struct linger)) {
855: error = EINVAL;
856: goto bad;
857: }
858: so->so_linger = mtod(m, struct linger *)->l_linger;
859: /* fall thru... */
860:
861: case SO_DEBUG:
862: case SO_KEEPALIVE:
863: case SO_DONTROUTE:
864: case SO_USELOOPBACK:
865: case SO_BROADCAST:
866: case SO_REUSEADDR:
1.15 mycroft 867: case SO_REUSEPORT:
1.1 cgd 868: case SO_OOBINLINE:
869: if (m == NULL || m->m_len < sizeof (int)) {
870: error = EINVAL;
871: goto bad;
872: }
873: if (*mtod(m, int *))
874: so->so_options |= optname;
875: else
876: so->so_options &= ~optname;
877: break;
878:
879: case SO_SNDBUF:
880: case SO_RCVBUF:
881: case SO_SNDLOWAT:
882: case SO_RCVLOWAT:
883: if (m == NULL || m->m_len < sizeof (int)) {
884: error = EINVAL;
885: goto bad;
886: }
887: switch (optname) {
888:
889: case SO_SNDBUF:
890: case SO_RCVBUF:
891: if (sbreserve(optname == SO_SNDBUF ?
892: &so->so_snd : &so->so_rcv,
893: (u_long) *mtod(m, int *)) == 0) {
894: error = ENOBUFS;
895: goto bad;
896: }
897: break;
898:
899: case SO_SNDLOWAT:
900: so->so_snd.sb_lowat = *mtod(m, int *);
901: break;
902: case SO_RCVLOWAT:
903: so->so_rcv.sb_lowat = *mtod(m, int *);
904: break;
905: }
906: break;
907:
908: case SO_SNDTIMEO:
909: case SO_RCVTIMEO:
910: {
911: struct timeval *tv;
912: short val;
913:
914: if (m == NULL || m->m_len < sizeof (*tv)) {
915: error = EINVAL;
916: goto bad;
917: }
918: tv = mtod(m, struct timeval *);
919: if (tv->tv_sec > SHRT_MAX / hz - hz) {
920: error = EDOM;
921: goto bad;
922: }
923: val = tv->tv_sec * hz + tv->tv_usec / tick;
924:
925: switch (optname) {
926:
927: case SO_SNDTIMEO:
928: so->so_snd.sb_timeo = val;
929: break;
930: case SO_RCVTIMEO:
931: so->so_rcv.sb_timeo = val;
932: break;
933: }
934: break;
935: }
936:
937: default:
938: error = ENOPROTOOPT;
939: break;
940: }
1.15 mycroft 941: if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
942: (void) ((*so->so_proto->pr_ctloutput)
943: (PRCO_SETOPT, so, level, optname, &m0));
944: m = NULL; /* freed by protocol */
945: }
1.1 cgd 946: }
947: bad:
948: if (m)
949: (void) m_free(m);
950: return (error);
951: }
952:
1.14 mycroft 953: int
1.1 cgd 954: sogetopt(so, level, optname, mp)
955: register struct socket *so;
956: int level, optname;
957: struct mbuf **mp;
958: {
959: register struct mbuf *m;
960:
961: if (level != SOL_SOCKET) {
962: if (so->so_proto && so->so_proto->pr_ctloutput) {
963: return ((*so->so_proto->pr_ctloutput)
964: (PRCO_GETOPT, so, level, optname, mp));
965: } else
966: return (ENOPROTOOPT);
967: } else {
968: m = m_get(M_WAIT, MT_SOOPTS);
969: m->m_len = sizeof (int);
970:
971: switch (optname) {
972:
973: case SO_LINGER:
974: m->m_len = sizeof (struct linger);
975: mtod(m, struct linger *)->l_onoff =
976: so->so_options & SO_LINGER;
977: mtod(m, struct linger *)->l_linger = so->so_linger;
978: break;
979:
980: case SO_USELOOPBACK:
981: case SO_DONTROUTE:
982: case SO_DEBUG:
983: case SO_KEEPALIVE:
984: case SO_REUSEADDR:
1.15 mycroft 985: case SO_REUSEPORT:
1.1 cgd 986: case SO_BROADCAST:
987: case SO_OOBINLINE:
988: *mtod(m, int *) = so->so_options & optname;
989: break;
990:
991: case SO_TYPE:
992: *mtod(m, int *) = so->so_type;
993: break;
994:
995: case SO_ERROR:
996: *mtod(m, int *) = so->so_error;
997: so->so_error = 0;
998: break;
999:
1000: case SO_SNDBUF:
1001: *mtod(m, int *) = so->so_snd.sb_hiwat;
1002: break;
1003:
1004: case SO_RCVBUF:
1005: *mtod(m, int *) = so->so_rcv.sb_hiwat;
1006: break;
1007:
1008: case SO_SNDLOWAT:
1009: *mtod(m, int *) = so->so_snd.sb_lowat;
1010: break;
1011:
1012: case SO_RCVLOWAT:
1013: *mtod(m, int *) = so->so_rcv.sb_lowat;
1014: break;
1015:
1016: case SO_SNDTIMEO:
1017: case SO_RCVTIMEO:
1018: {
1019: int val = (optname == SO_SNDTIMEO ?
1020: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1021:
1022: m->m_len = sizeof(struct timeval);
1023: mtod(m, struct timeval *)->tv_sec = val / hz;
1024: mtod(m, struct timeval *)->tv_usec =
1025: (val % hz) / tick;
1026: break;
1027: }
1028:
1029: default:
1030: (void)m_free(m);
1031: return (ENOPROTOOPT);
1032: }
1033: *mp = m;
1034: return (0);
1035: }
1036: }
1037:
1.14 mycroft 1038: void
1.1 cgd 1039: sohasoutofband(so)
1040: register struct socket *so;
1041: {
1042: struct proc *p;
1043:
1044: if (so->so_pgid < 0)
1045: gsignal(-so->so_pgid, SIGURG);
1046: else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0)
1047: psignal(p, SIGURG);
1.2 cgd 1048: selwakeup(&so->so_rcv.sb_sel);
1.1 cgd 1049: }