Annotation of src/sys/kern/uipc_socket.c, Revision 1.19
1.19 ! cgd 1: /* $NetBSD: uipc_socket.c,v 1.18 1995/04/22 19:43:04 christos 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
1.18 christos 94: {
95: extern struct emul emul_sunos;
96: if (p->p_emul == &emul_sunos && type == SOCK_DGRAM)
97: so->so_options |= SO_BROADCAST;
98: }
1.10 deraadt 99: #endif
1.1 cgd 100: *aso = so;
101: return (0);
102: }
103:
1.3 andrew 104: int
1.1 cgd 105: sobind(so, nam)
106: struct socket *so;
107: struct mbuf *nam;
108: {
109: int s = splnet();
110: int error;
111:
112: error =
113: (*so->so_proto->pr_usrreq)(so, PRU_BIND,
114: (struct mbuf *)0, nam, (struct mbuf *)0);
115: splx(s);
116: return (error);
117: }
118:
1.3 andrew 119: int
1.1 cgd 120: solisten(so, backlog)
121: register struct socket *so;
122: int backlog;
123: {
124: int s = splnet(), error;
125:
126: error =
127: (*so->so_proto->pr_usrreq)(so, PRU_LISTEN,
128: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0);
129: if (error) {
130: splx(s);
131: return (error);
132: }
133: if (so->so_q == 0)
134: so->so_options |= SO_ACCEPTCONN;
135: if (backlog < 0)
136: backlog = 0;
137: so->so_qlimit = min(backlog, SOMAXCONN);
138: splx(s);
139: return (0);
140: }
141:
1.3 andrew 142: int
1.1 cgd 143: sofree(so)
144: register struct socket *so;
145: {
146:
147: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
148: return;
149: if (so->so_head) {
150: if (!soqremque(so, 0) && !soqremque(so, 1))
151: panic("sofree dq");
152: so->so_head = 0;
153: }
154: sbrelease(&so->so_snd);
155: sorflush(so);
156: FREE(so, M_SOCKET);
157: }
158:
159: /*
160: * Close a socket on last file table reference removal.
161: * Initiate disconnect if connected.
162: * Free socket when disconnect complete.
163: */
1.3 andrew 164: int
1.1 cgd 165: soclose(so)
166: register struct socket *so;
167: {
168: int s = splnet(); /* conservative */
169: int error = 0;
170:
171: if (so->so_options & SO_ACCEPTCONN) {
172: while (so->so_q0)
173: (void) soabort(so->so_q0);
174: while (so->so_q)
175: (void) soabort(so->so_q);
176: }
177: if (so->so_pcb == 0)
178: goto discard;
179: if (so->so_state & SS_ISCONNECTED) {
180: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
181: error = sodisconnect(so);
182: if (error)
183: goto drop;
184: }
185: if (so->so_options & SO_LINGER) {
186: if ((so->so_state & SS_ISDISCONNECTING) &&
187: (so->so_state & SS_NBIO))
188: goto drop;
189: while (so->so_state & SS_ISCONNECTED)
190: if (error = tsleep((caddr_t)&so->so_timeo,
191: PSOCK | PCATCH, netcls, so->so_linger))
192: break;
193: }
194: }
195: drop:
196: if (so->so_pcb) {
197: int error2 =
198: (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
199: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0);
200: if (error == 0)
201: error = error2;
202: }
203: discard:
204: if (so->so_state & SS_NOFDREF)
205: panic("soclose: NOFDREF");
206: so->so_state |= SS_NOFDREF;
207: sofree(so);
208: splx(s);
209: return (error);
210: }
211:
212: /*
213: * Must be called at splnet...
214: */
1.3 andrew 215: int
1.1 cgd 216: soabort(so)
217: struct socket *so;
218: {
219:
220: return (
221: (*so->so_proto->pr_usrreq)(so, PRU_ABORT,
222: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0));
223: }
224:
1.3 andrew 225: int
1.1 cgd 226: soaccept(so, nam)
227: register struct socket *so;
228: struct mbuf *nam;
229: {
230: int s = splnet();
231: int error;
232:
233: if ((so->so_state & SS_NOFDREF) == 0)
234: panic("soaccept: !NOFDREF");
235: so->so_state &= ~SS_NOFDREF;
236: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
237: (struct mbuf *)0, nam, (struct mbuf *)0);
238: splx(s);
239: return (error);
240: }
241:
1.3 andrew 242: int
1.1 cgd 243: soconnect(so, nam)
244: register struct socket *so;
245: struct mbuf *nam;
246: {
247: int s;
248: int error;
249:
250: if (so->so_options & SO_ACCEPTCONN)
251: return (EOPNOTSUPP);
252: s = splnet();
253: /*
254: * If protocol is connection-based, can only connect once.
255: * Otherwise, if connected, try to disconnect first.
256: * This allows user to disconnect by connecting to, e.g.,
257: * a null address.
258: */
259: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
260: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
261: (error = sodisconnect(so))))
262: error = EISCONN;
263: else
264: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
265: (struct mbuf *)0, nam, (struct mbuf *)0);
266: splx(s);
267: return (error);
268: }
269:
1.3 andrew 270: int
1.1 cgd 271: soconnect2(so1, so2)
272: register struct socket *so1;
273: struct socket *so2;
274: {
275: int s = splnet();
276: int error;
277:
278: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
279: (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0);
280: splx(s);
281: return (error);
282: }
283:
1.3 andrew 284: int
1.1 cgd 285: sodisconnect(so)
286: register struct socket *so;
287: {
288: int s = splnet();
289: int error;
290:
291: if ((so->so_state & SS_ISCONNECTED) == 0) {
292: error = ENOTCONN;
293: goto bad;
294: }
295: if (so->so_state & SS_ISDISCONNECTING) {
296: error = EALREADY;
297: goto bad;
298: }
299: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
300: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0);
301: bad:
302: splx(s);
303: return (error);
304: }
305:
1.15 mycroft 306: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 307: /*
308: * Send on a socket.
309: * If send must go all at once and message is larger than
310: * send buffering, then hard error.
311: * Lock against other senders.
312: * If must go all at once and not enough room now, then
313: * inform user that this would block and do nothing.
314: * Otherwise, if nonblocking, send as much as possible.
315: * The data to be sent is described by "uio" if nonzero,
316: * otherwise by the mbuf chain "top" (which must be null
317: * if uio is not). Data provided in mbuf chain must be small
318: * enough to send all at once.
319: *
320: * Returns nonzero on error, timeout or signal; callers
321: * must check for short counts if EINTR/ERESTART are returned.
322: * Data and control buffers are freed on return.
323: */
1.3 andrew 324: int
1.1 cgd 325: sosend(so, addr, uio, top, control, flags)
326: register struct socket *so;
327: struct mbuf *addr;
328: struct uio *uio;
329: struct mbuf *top;
330: struct mbuf *control;
331: int flags;
332: {
1.15 mycroft 333: struct proc *p = curproc; /* XXX */
1.1 cgd 334: struct mbuf **mp;
335: register struct mbuf *m;
336: register long space, len, resid;
337: int clen = 0, error, s, dontroute, mlen;
338: int atomic = sosendallatonce(so) || top;
339:
340: if (uio)
341: resid = uio->uio_resid;
342: else
343: resid = top->m_pkthdr.len;
1.7 cgd 344: /*
345: * In theory resid should be unsigned.
346: * However, space must be signed, as it might be less than 0
347: * if we over-committed, and we must use a signed comparison
348: * of space and resid. On the other hand, a negative resid
349: * causes us to loop sending 0-length segments to the protocol.
350: */
351: if (resid < 0)
352: return (EINVAL);
1.1 cgd 353: dontroute =
354: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
355: (so->so_proto->pr_flags & PR_ATOMIC);
1.12 mycroft 356: p->p_stats->p_ru.ru_msgsnd++;
1.1 cgd 357: if (control)
358: clen = control->m_len;
359: #define snderr(errno) { error = errno; splx(s); goto release; }
360:
361: restart:
1.15 mycroft 362: if (error = sblock(&so->so_snd, SBLOCKWAIT(flags)))
1.1 cgd 363: goto out;
364: do {
365: s = splnet();
366: if (so->so_state & SS_CANTSENDMORE)
367: snderr(EPIPE);
368: if (so->so_error)
369: snderr(so->so_error);
370: if ((so->so_state & SS_ISCONNECTED) == 0) {
371: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
372: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
373: !(resid == 0 && clen != 0))
374: snderr(ENOTCONN);
375: } else if (addr == 0)
376: snderr(EDESTADDRREQ);
377: }
378: space = sbspace(&so->so_snd);
379: if (flags & MSG_OOB)
380: space += 1024;
1.11 mycroft 381: if (atomic && resid > so->so_snd.sb_hiwat ||
382: clen > so->so_snd.sb_hiwat)
383: snderr(EMSGSIZE);
384: if (space < resid + clen && uio &&
1.1 cgd 385: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
386: if (so->so_state & SS_NBIO)
387: snderr(EWOULDBLOCK);
388: sbunlock(&so->so_snd);
389: error = sbwait(&so->so_snd);
390: splx(s);
391: if (error)
392: goto out;
393: goto restart;
394: }
395: splx(s);
396: mp = ⊤
397: space -= clen;
398: do {
399: if (uio == NULL) {
400: /*
401: * Data is prepackaged in "top".
402: */
403: resid = 0;
404: if (flags & MSG_EOR)
405: top->m_flags |= M_EOR;
406: } else do {
407: if (top == 0) {
408: MGETHDR(m, M_WAIT, MT_DATA);
409: mlen = MHLEN;
410: m->m_pkthdr.len = 0;
411: m->m_pkthdr.rcvif = (struct ifnet *)0;
412: } else {
413: MGET(m, M_WAIT, MT_DATA);
414: mlen = MLEN;
415: }
1.15 mycroft 416: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.1 cgd 417: MCLGET(m, M_WAIT);
418: if ((m->m_flags & M_EXT) == 0)
419: goto nopages;
420: mlen = MCLBYTES;
1.15 mycroft 421: #ifdef MAPPED_MBUFS
422: len = min(MCLBYTES, resid);
423: #else
424: if (atomic && top == 0) {
425: len = min(MCLBYTES - max_hdr, resid);
426: m->m_data += max_hdr;
427: } else
428: len = min(MCLBYTES, resid);
429: #endif
430: space -= MCLBYTES;
1.1 cgd 431: } else {
432: nopages:
433: len = min(min(mlen, resid), space);
1.15 mycroft 434: space -= len;
1.1 cgd 435: /*
436: * For datagram protocols, leave room
437: * for protocol headers in first mbuf.
438: */
439: if (atomic && top == 0 && len < mlen)
440: MH_ALIGN(m, len);
441: }
442: error = uiomove(mtod(m, caddr_t), (int)len, uio);
443: resid = uio->uio_resid;
444: m->m_len = len;
445: *mp = m;
446: top->m_pkthdr.len += len;
447: if (error)
448: goto release;
449: mp = &m->m_next;
450: if (resid <= 0) {
451: if (flags & MSG_EOR)
452: top->m_flags |= M_EOR;
453: break;
454: }
455: } while (space > 0 && atomic);
456: if (dontroute)
457: so->so_options |= SO_DONTROUTE;
458: s = splnet(); /* XXX */
459: error = (*so->so_proto->pr_usrreq)(so,
460: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
461: top, addr, control);
462: splx(s);
463: if (dontroute)
464: so->so_options &= ~SO_DONTROUTE;
465: clen = 0;
466: control = 0;
467: top = 0;
468: mp = ⊤
469: if (error)
470: goto release;
471: } while (resid && space > 0);
472: } while (resid);
473:
474: release:
475: sbunlock(&so->so_snd);
476: out:
477: if (top)
478: m_freem(top);
479: if (control)
480: m_freem(control);
481: return (error);
482: }
483:
484: /*
485: * Implement receive operations on a socket.
486: * We depend on the way that records are added to the sockbuf
487: * by sbappend*. In particular, each record (mbufs linked through m_next)
488: * must begin with an address if the protocol so specifies,
489: * followed by an optional mbuf or mbufs containing ancillary data,
490: * and then zero or more mbufs of data.
491: * In order to avoid blocking network interrupts for the entire time here,
492: * we splx() while doing the actual copy to user space.
493: * Although the sockbuf is locked, new data may still be appended,
494: * and thus we must maintain consistency of the sockbuf during that time.
495: *
496: * The caller may receive the data as a single mbuf chain by supplying
497: * an mbuf **mp0 for use in returning the chain. The uio is then used
498: * only for the count in uio_resid.
499: */
1.3 andrew 500: int
1.1 cgd 501: soreceive(so, paddr, uio, mp0, controlp, flagsp)
502: register struct socket *so;
503: struct mbuf **paddr;
504: struct uio *uio;
505: struct mbuf **mp0;
506: struct mbuf **controlp;
507: int *flagsp;
508: {
509: register struct mbuf *m, **mp;
510: register int flags, len, error, s, offset;
511: struct protosw *pr = so->so_proto;
512: struct mbuf *nextrecord;
513: int moff, type;
1.3 andrew 514: int orig_resid = uio->uio_resid;
1.1 cgd 515:
516: mp = mp0;
517: if (paddr)
518: *paddr = 0;
519: if (controlp)
520: *controlp = 0;
521: if (flagsp)
522: flags = *flagsp &~ MSG_EOR;
523: else
524: flags = 0;
525: if (flags & MSG_OOB) {
526: m = m_get(M_WAIT, MT_DATA);
1.17 cgd 527: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
528: (struct mbuf *)(long)(flags & MSG_PEEK), (struct mbuf *)0);
1.1 cgd 529: if (error)
530: goto bad;
531: do {
532: error = uiomove(mtod(m, caddr_t),
533: (int) min(uio->uio_resid, m->m_len), uio);
534: m = m_free(m);
535: } while (uio->uio_resid && error == 0 && m);
536: bad:
537: if (m)
538: m_freem(m);
539: return (error);
540: }
541: if (mp)
542: *mp = (struct mbuf *)0;
543: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
544: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
545: (struct mbuf *)0, (struct mbuf *)0);
546:
547: restart:
1.15 mycroft 548: if (error = sblock(&so->so_rcv, SBLOCKWAIT(flags)))
1.1 cgd 549: return (error);
550: s = splnet();
551:
552: m = so->so_rcv.sb_mb;
553: /*
554: * If we have less data than requested, block awaiting more
555: * (subject to any timeout) if:
1.15 mycroft 556: * 1. the current count is less than the low water mark,
1.1 cgd 557: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 558: * receive operation at once if we block (resid <= hiwat), or
559: * 3. MSG_DONTWAIT is not set.
1.1 cgd 560: * If MSG_WAITALL is set but resid is larger than the receive buffer,
561: * we have to do the receive in sections, and thus risk returning
562: * a short count if a timeout or signal occurs after we start.
563: */
1.15 mycroft 564: if (m == 0 || ((flags & MSG_DONTWAIT) == 0 &&
565: so->so_rcv.sb_cc < uio->uio_resid) &&
1.1 cgd 566: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
567: ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.3 andrew 568: m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0) {
1.1 cgd 569: #ifdef DIAGNOSTIC
570: if (m == 0 && so->so_rcv.sb_cc)
571: panic("receive 1");
572: #endif
573: if (so->so_error) {
574: if (m)
1.15 mycroft 575: goto dontblock;
1.1 cgd 576: error = so->so_error;
577: if ((flags & MSG_PEEK) == 0)
578: so->so_error = 0;
579: goto release;
580: }
581: if (so->so_state & SS_CANTRCVMORE) {
582: if (m)
1.15 mycroft 583: goto dontblock;
1.1 cgd 584: else
585: goto release;
586: }
587: for (; m; m = m->m_next)
588: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
589: m = so->so_rcv.sb_mb;
590: goto dontblock;
591: }
592: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
593: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
594: error = ENOTCONN;
595: goto release;
596: }
597: if (uio->uio_resid == 0)
598: goto release;
1.15 mycroft 599: if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) {
1.1 cgd 600: error = EWOULDBLOCK;
601: goto release;
602: }
603: sbunlock(&so->so_rcv);
604: error = sbwait(&so->so_rcv);
605: splx(s);
606: if (error)
607: return (error);
608: goto restart;
609: }
610: dontblock:
1.15 mycroft 611: #ifdef notyet /* XXXX */
612: if (uio->uio_procp)
613: uio->uio_procp->p_stats->p_ru.ru_msgrcv++;
614: #endif
1.1 cgd 615: nextrecord = m->m_nextpkt;
616: if (pr->pr_flags & PR_ADDR) {
617: #ifdef DIAGNOSTIC
618: if (m->m_type != MT_SONAME)
619: panic("receive 1a");
620: #endif
1.3 andrew 621: orig_resid = 0;
1.1 cgd 622: if (flags & MSG_PEEK) {
623: if (paddr)
624: *paddr = m_copy(m, 0, m->m_len);
625: m = m->m_next;
626: } else {
627: sbfree(&so->so_rcv, m);
628: if (paddr) {
629: *paddr = m;
630: so->so_rcv.sb_mb = m->m_next;
631: m->m_next = 0;
632: m = so->so_rcv.sb_mb;
633: } else {
634: MFREE(m, so->so_rcv.sb_mb);
635: m = so->so_rcv.sb_mb;
636: }
637: }
638: }
639: while (m && m->m_type == MT_CONTROL && error == 0) {
640: if (flags & MSG_PEEK) {
641: if (controlp)
642: *controlp = m_copy(m, 0, m->m_len);
643: m = m->m_next;
644: } else {
645: sbfree(&so->so_rcv, m);
646: if (controlp) {
647: if (pr->pr_domain->dom_externalize &&
648: mtod(m, struct cmsghdr *)->cmsg_type ==
649: SCM_RIGHTS)
650: error = (*pr->pr_domain->dom_externalize)(m);
651: *controlp = m;
652: so->so_rcv.sb_mb = m->m_next;
653: m->m_next = 0;
654: m = so->so_rcv.sb_mb;
655: } else {
656: MFREE(m, so->so_rcv.sb_mb);
657: m = so->so_rcv.sb_mb;
658: }
659: }
1.3 andrew 660: if (controlp) {
661: orig_resid = 0;
1.1 cgd 662: controlp = &(*controlp)->m_next;
1.3 andrew 663: }
1.1 cgd 664: }
665: if (m) {
666: if ((flags & MSG_PEEK) == 0)
667: m->m_nextpkt = nextrecord;
668: type = m->m_type;
669: if (type == MT_OOBDATA)
670: flags |= MSG_OOB;
671: }
672: moff = 0;
673: offset = 0;
674: while (m && uio->uio_resid > 0 && error == 0) {
675: if (m->m_type == MT_OOBDATA) {
676: if (type != MT_OOBDATA)
677: break;
678: } else if (type == MT_OOBDATA)
679: break;
680: #ifdef DIAGNOSTIC
681: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
682: panic("receive 3");
683: #endif
684: so->so_state &= ~SS_RCVATMARK;
685: len = uio->uio_resid;
686: if (so->so_oobmark && len > so->so_oobmark - offset)
687: len = so->so_oobmark - offset;
688: if (len > m->m_len - moff)
689: len = m->m_len - moff;
690: /*
691: * If mp is set, just pass back the mbufs.
692: * Otherwise copy them out via the uio, then free.
693: * Sockbuf must be consistent here (points to current mbuf,
694: * it points to next record) when we drop priority;
695: * we must note any additions to the sockbuf when we
696: * block interrupts again.
697: */
698: if (mp == 0) {
699: splx(s);
700: error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio);
701: s = splnet();
702: } else
703: uio->uio_resid -= len;
704: if (len == m->m_len - moff) {
705: if (m->m_flags & M_EOR)
706: flags |= MSG_EOR;
707: if (flags & MSG_PEEK) {
708: m = m->m_next;
709: moff = 0;
710: } else {
711: nextrecord = m->m_nextpkt;
712: sbfree(&so->so_rcv, m);
713: if (mp) {
714: *mp = m;
715: mp = &m->m_next;
716: so->so_rcv.sb_mb = m = m->m_next;
717: *mp = (struct mbuf *)0;
718: } else {
719: MFREE(m, so->so_rcv.sb_mb);
720: m = so->so_rcv.sb_mb;
721: }
722: if (m)
723: m->m_nextpkt = nextrecord;
724: }
725: } else {
726: if (flags & MSG_PEEK)
727: moff += len;
728: else {
729: if (mp)
730: *mp = m_copym(m, 0, len, M_WAIT);
731: m->m_data += len;
732: m->m_len -= len;
733: so->so_rcv.sb_cc -= len;
734: }
735: }
736: if (so->so_oobmark) {
737: if ((flags & MSG_PEEK) == 0) {
738: so->so_oobmark -= len;
739: if (so->so_oobmark == 0) {
740: so->so_state |= SS_RCVATMARK;
741: break;
742: }
1.7 cgd 743: } else {
1.1 cgd 744: offset += len;
1.7 cgd 745: if (offset == so->so_oobmark)
746: break;
747: }
1.1 cgd 748: }
749: if (flags & MSG_EOR)
750: break;
751: /*
752: * If the MSG_WAITALL flag is set (for non-atomic socket),
753: * we must not quit until "uio->uio_resid == 0" or an error
754: * termination. If a signal/timeout occurs, return
755: * with a short count but without error.
756: * Keep sockbuf locked against other readers.
757: */
758: while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 &&
1.3 andrew 759: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 760: if (so->so_error || so->so_state & SS_CANTRCVMORE)
761: break;
762: error = sbwait(&so->so_rcv);
763: if (error) {
764: sbunlock(&so->so_rcv);
765: splx(s);
766: return (0);
767: }
768: if (m = so->so_rcv.sb_mb)
769: nextrecord = m->m_nextpkt;
770: }
771: }
1.3 andrew 772:
773: if (m && pr->pr_flags & PR_ATOMIC) {
774: flags |= MSG_TRUNC;
775: if ((flags & MSG_PEEK) == 0)
776: (void) sbdroprecord(&so->so_rcv);
777: }
1.1 cgd 778: if ((flags & MSG_PEEK) == 0) {
779: if (m == 0)
780: so->so_rcv.sb_mb = nextrecord;
781: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
782: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
1.17 cgd 783: (struct mbuf *)(long)flags, (struct mbuf *)0,
1.1 cgd 784: (struct mbuf *)0);
785: }
1.3 andrew 786: if (orig_resid == uio->uio_resid && orig_resid &&
787: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
788: sbunlock(&so->so_rcv);
789: splx(s);
790: goto restart;
791: }
792:
1.1 cgd 793: if (flagsp)
794: *flagsp |= flags;
795: release:
796: sbunlock(&so->so_rcv);
797: splx(s);
798: return (error);
799: }
800:
1.14 mycroft 801: int
1.1 cgd 802: soshutdown(so, how)
803: register struct socket *so;
804: register int how;
805: {
806: register struct protosw *pr = so->so_proto;
807:
808: how++;
809: if (how & FREAD)
810: sorflush(so);
811: if (how & FWRITE)
812: return ((*pr->pr_usrreq)(so, PRU_SHUTDOWN,
813: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0));
814: return (0);
815: }
816:
1.14 mycroft 817: void
1.1 cgd 818: sorflush(so)
819: register struct socket *so;
820: {
821: register struct sockbuf *sb = &so->so_rcv;
822: register struct protosw *pr = so->so_proto;
823: register int s;
824: struct sockbuf asb;
825:
826: sb->sb_flags |= SB_NOINTR;
1.15 mycroft 827: (void) sblock(sb, M_WAITOK);
1.1 cgd 828: s = splimp();
829: socantrcvmore(so);
830: sbunlock(sb);
831: asb = *sb;
832: bzero((caddr_t)sb, sizeof (*sb));
833: splx(s);
834: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
835: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
836: sbrelease(&asb);
837: }
838:
1.14 mycroft 839: int
1.1 cgd 840: sosetopt(so, level, optname, m0)
841: register struct socket *so;
842: int level, optname;
843: struct mbuf *m0;
844: {
845: int error = 0;
846: register struct mbuf *m = m0;
847:
848: if (level != SOL_SOCKET) {
849: if (so->so_proto && so->so_proto->pr_ctloutput)
850: return ((*so->so_proto->pr_ctloutput)
851: (PRCO_SETOPT, so, level, optname, &m0));
852: error = ENOPROTOOPT;
853: } else {
854: switch (optname) {
855:
856: case SO_LINGER:
857: if (m == NULL || m->m_len != sizeof (struct linger)) {
858: error = EINVAL;
859: goto bad;
860: }
861: so->so_linger = mtod(m, struct linger *)->l_linger;
862: /* fall thru... */
863:
864: case SO_DEBUG:
865: case SO_KEEPALIVE:
866: case SO_DONTROUTE:
867: case SO_USELOOPBACK:
868: case SO_BROADCAST:
869: case SO_REUSEADDR:
1.15 mycroft 870: case SO_REUSEPORT:
1.1 cgd 871: case SO_OOBINLINE:
872: if (m == NULL || m->m_len < sizeof (int)) {
873: error = EINVAL;
874: goto bad;
875: }
876: if (*mtod(m, int *))
877: so->so_options |= optname;
878: else
879: so->so_options &= ~optname;
880: break;
881:
882: case SO_SNDBUF:
883: case SO_RCVBUF:
884: case SO_SNDLOWAT:
885: case SO_RCVLOWAT:
886: if (m == NULL || m->m_len < sizeof (int)) {
887: error = EINVAL;
888: goto bad;
889: }
890: switch (optname) {
891:
892: case SO_SNDBUF:
893: case SO_RCVBUF:
894: if (sbreserve(optname == SO_SNDBUF ?
895: &so->so_snd : &so->so_rcv,
896: (u_long) *mtod(m, int *)) == 0) {
897: error = ENOBUFS;
898: goto bad;
899: }
900: break;
901:
902: case SO_SNDLOWAT:
903: so->so_snd.sb_lowat = *mtod(m, int *);
904: break;
905: case SO_RCVLOWAT:
906: so->so_rcv.sb_lowat = *mtod(m, int *);
907: break;
908: }
909: break;
910:
911: case SO_SNDTIMEO:
912: case SO_RCVTIMEO:
913: {
914: struct timeval *tv;
915: short val;
916:
917: if (m == NULL || m->m_len < sizeof (*tv)) {
918: error = EINVAL;
919: goto bad;
920: }
921: tv = mtod(m, struct timeval *);
1.19 ! cgd 922: if (tv->tv_sec * hz + tv->tv_usec / tick > SHRT_MAX) {
1.1 cgd 923: error = EDOM;
924: goto bad;
925: }
926: val = tv->tv_sec * hz + tv->tv_usec / tick;
927:
928: switch (optname) {
929:
930: case SO_SNDTIMEO:
931: so->so_snd.sb_timeo = val;
932: break;
933: case SO_RCVTIMEO:
934: so->so_rcv.sb_timeo = val;
935: break;
936: }
937: break;
938: }
939:
940: default:
941: error = ENOPROTOOPT;
942: break;
943: }
1.15 mycroft 944: if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
945: (void) ((*so->so_proto->pr_ctloutput)
946: (PRCO_SETOPT, so, level, optname, &m0));
947: m = NULL; /* freed by protocol */
948: }
1.1 cgd 949: }
950: bad:
951: if (m)
952: (void) m_free(m);
953: return (error);
954: }
955:
1.14 mycroft 956: int
1.1 cgd 957: sogetopt(so, level, optname, mp)
958: register struct socket *so;
959: int level, optname;
960: struct mbuf **mp;
961: {
962: register struct mbuf *m;
963:
964: if (level != SOL_SOCKET) {
965: if (so->so_proto && so->so_proto->pr_ctloutput) {
966: return ((*so->so_proto->pr_ctloutput)
967: (PRCO_GETOPT, so, level, optname, mp));
968: } else
969: return (ENOPROTOOPT);
970: } else {
971: m = m_get(M_WAIT, MT_SOOPTS);
972: m->m_len = sizeof (int);
973:
974: switch (optname) {
975:
976: case SO_LINGER:
977: m->m_len = sizeof (struct linger);
978: mtod(m, struct linger *)->l_onoff =
979: so->so_options & SO_LINGER;
980: mtod(m, struct linger *)->l_linger = so->so_linger;
981: break;
982:
983: case SO_USELOOPBACK:
984: case SO_DONTROUTE:
985: case SO_DEBUG:
986: case SO_KEEPALIVE:
987: case SO_REUSEADDR:
1.15 mycroft 988: case SO_REUSEPORT:
1.1 cgd 989: case SO_BROADCAST:
990: case SO_OOBINLINE:
991: *mtod(m, int *) = so->so_options & optname;
992: break;
993:
994: case SO_TYPE:
995: *mtod(m, int *) = so->so_type;
996: break;
997:
998: case SO_ERROR:
999: *mtod(m, int *) = so->so_error;
1000: so->so_error = 0;
1001: break;
1002:
1003: case SO_SNDBUF:
1004: *mtod(m, int *) = so->so_snd.sb_hiwat;
1005: break;
1006:
1007: case SO_RCVBUF:
1008: *mtod(m, int *) = so->so_rcv.sb_hiwat;
1009: break;
1010:
1011: case SO_SNDLOWAT:
1012: *mtod(m, int *) = so->so_snd.sb_lowat;
1013: break;
1014:
1015: case SO_RCVLOWAT:
1016: *mtod(m, int *) = so->so_rcv.sb_lowat;
1017: break;
1018:
1019: case SO_SNDTIMEO:
1020: case SO_RCVTIMEO:
1021: {
1022: int val = (optname == SO_SNDTIMEO ?
1023: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1024:
1025: m->m_len = sizeof(struct timeval);
1026: mtod(m, struct timeval *)->tv_sec = val / hz;
1027: mtod(m, struct timeval *)->tv_usec =
1028: (val % hz) / tick;
1029: break;
1030: }
1031:
1032: default:
1033: (void)m_free(m);
1034: return (ENOPROTOOPT);
1035: }
1036: *mp = m;
1037: return (0);
1038: }
1039: }
1040:
1.14 mycroft 1041: void
1.1 cgd 1042: sohasoutofband(so)
1043: register struct socket *so;
1044: {
1045: struct proc *p;
1046:
1047: if (so->so_pgid < 0)
1048: gsignal(-so->so_pgid, SIGURG);
1049: else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0)
1050: psignal(p, SIGURG);
1.2 cgd 1051: selwakeup(&so->so_rcv.sb_sel);
1.1 cgd 1052: }
CVSweb <webmaster@jp.NetBSD.org>