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1.29.4.1! mellon 1: /* $NetBSD: uipc_socket.c,v 1.31 1998/01/07 23:47:08 thorpej 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>
1.21 christos 49: #include <sys/signalvar.h>
1.9 mycroft 50: #include <sys/resourcevar.h>
1.1 cgd 51:
52: /*
53: * Socket operation routines.
54: * These routines are called by the routines in
55: * sys_socket.c or from a system process, and
56: * implement the semantics of socket operations by
57: * switching out to the protocol specific routines.
58: */
59: /*ARGSUSED*/
1.3 andrew 60: int
1.1 cgd 61: socreate(dom, aso, type, proto)
1.11 mycroft 62: int dom;
1.1 cgd 63: struct socket **aso;
64: register int type;
65: int proto;
66: {
67: struct proc *p = curproc; /* XXX */
68: register struct protosw *prp;
69: register struct socket *so;
70: register int error;
71:
72: if (proto)
73: prp = pffindproto(dom, proto, type);
74: else
75: prp = pffindtype(dom, type);
1.15 mycroft 76: if (prp == 0 || prp->pr_usrreq == 0)
1.1 cgd 77: return (EPROTONOSUPPORT);
78: if (prp->pr_type != type)
79: return (EPROTOTYPE);
80: MALLOC(so, struct socket *, sizeof(*so), M_SOCKET, M_WAIT);
81: bzero((caddr_t)so, sizeof(*so));
1.29.4.1! mellon 82: TAILQ_INIT(&so->so_q0);
! 83: TAILQ_INIT(&so->so_q);
1.1 cgd 84: so->so_type = type;
85: so->so_proto = prp;
1.22 mycroft 86: error = (*prp->pr_usrreq)(so, PRU_ATTACH, (struct mbuf *)0,
87: (struct mbuf *)(long)proto, (struct mbuf *)0, p);
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: {
1.22 mycroft 109: struct proc *p = curproc; /* XXX */
1.20 mycroft 110: int s = splsoftnet();
1.1 cgd 111: int error;
112:
1.22 mycroft 113: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, (struct mbuf *)0,
114: nam, (struct mbuf *)0, p);
1.1 cgd 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: {
1.20 mycroft 124: int s = splsoftnet(), error;
1.1 cgd 125:
1.22 mycroft 126: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, (struct mbuf *)0,
127: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 128: if (error) {
129: splx(s);
130: return (error);
131: }
1.29.4.1! mellon 132: if (so->so_q.tqh_first == NULL)
1.1 cgd 133: so->so_options |= SO_ACCEPTCONN;
134: if (backlog < 0)
135: backlog = 0;
136: so->so_qlimit = min(backlog, SOMAXCONN);
137: splx(s);
138: return (0);
139: }
140:
1.21 christos 141: void
1.1 cgd 142: sofree(so)
143: register struct socket *so;
144: {
145:
146: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
147: return;
148: if (so->so_head) {
149: if (!soqremque(so, 0) && !soqremque(so, 1))
150: panic("sofree dq");
151: so->so_head = 0;
152: }
153: sbrelease(&so->so_snd);
154: sorflush(so);
155: FREE(so, M_SOCKET);
156: }
157:
158: /*
159: * Close a socket on last file table reference removal.
160: * Initiate disconnect if connected.
161: * Free socket when disconnect complete.
162: */
1.3 andrew 163: int
1.1 cgd 164: soclose(so)
165: register struct socket *so;
166: {
1.20 mycroft 167: int s = splsoftnet(); /* conservative */
1.1 cgd 168: int error = 0;
169:
170: if (so->so_options & SO_ACCEPTCONN) {
1.29.4.1! mellon 171: while (so->so_q0.tqh_first)
! 172: (void) soabort(so->so_q0.tqh_first);
! 173: while (so->so_q.tqh_first)
! 174: (void) soabort(so->so_q.tqh_first);
1.1 cgd 175: }
176: if (so->so_pcb == 0)
177: goto discard;
178: if (so->so_state & SS_ISCONNECTED) {
179: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
180: error = sodisconnect(so);
181: if (error)
182: goto drop;
183: }
184: if (so->so_options & SO_LINGER) {
185: if ((so->so_state & SS_ISDISCONNECTING) &&
186: (so->so_state & SS_NBIO))
187: goto drop;
1.21 christos 188: while (so->so_state & SS_ISCONNECTED) {
189: error = tsleep((caddr_t)&so->so_timeo,
190: PSOCK | PCATCH, netcls,
1.29.4.1! mellon 191: so->so_linger * hz);
1.21 christos 192: if (error)
1.1 cgd 193: break;
1.21 christos 194: }
1.1 cgd 195: }
196: }
197: drop:
198: if (so->so_pcb) {
1.22 mycroft 199: int error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
200: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0,
201: (struct proc *)0);
1.1 cgd 202: if (error == 0)
203: error = error2;
204: }
205: discard:
206: if (so->so_state & SS_NOFDREF)
207: panic("soclose: NOFDREF");
208: so->so_state |= SS_NOFDREF;
209: sofree(so);
210: splx(s);
211: return (error);
212: }
213:
214: /*
1.20 mycroft 215: * Must be called at splsoftnet...
1.1 cgd 216: */
1.3 andrew 217: int
1.1 cgd 218: soabort(so)
219: struct socket *so;
220: {
221:
1.22 mycroft 222: return (*so->so_proto->pr_usrreq)(so, PRU_ABORT, (struct mbuf *)0,
223: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 224: }
225:
1.3 andrew 226: int
1.1 cgd 227: soaccept(so, nam)
228: register struct socket *so;
229: struct mbuf *nam;
230: {
1.20 mycroft 231: int s = splsoftnet();
1.1 cgd 232: int error;
233:
234: if ((so->so_state & SS_NOFDREF) == 0)
235: panic("soaccept: !NOFDREF");
236: so->so_state &= ~SS_NOFDREF;
1.22 mycroft 237: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, (struct mbuf *)0,
238: nam, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 239: splx(s);
240: return (error);
241: }
242:
1.3 andrew 243: int
1.1 cgd 244: soconnect(so, nam)
245: register struct socket *so;
246: struct mbuf *nam;
247: {
1.23 mycroft 248: struct proc *p = curproc; /* XXX */
1.1 cgd 249: int s;
250: int error;
251:
252: if (so->so_options & SO_ACCEPTCONN)
253: return (EOPNOTSUPP);
1.20 mycroft 254: s = splsoftnet();
1.1 cgd 255: /*
256: * If protocol is connection-based, can only connect once.
257: * Otherwise, if connected, try to disconnect first.
258: * This allows user to disconnect by connecting to, e.g.,
259: * a null address.
260: */
261: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
262: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
263: (error = sodisconnect(so))))
264: error = EISCONN;
265: else
266: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.23 mycroft 267: (struct mbuf *)0, nam, (struct mbuf *)0, p);
1.1 cgd 268: splx(s);
269: return (error);
270: }
271:
1.3 andrew 272: int
1.1 cgd 273: soconnect2(so1, so2)
274: register struct socket *so1;
275: struct socket *so2;
276: {
1.20 mycroft 277: int s = splsoftnet();
1.1 cgd 278: int error;
279:
1.22 mycroft 280: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
281: (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0,
282: (struct proc *)0);
1.1 cgd 283: splx(s);
284: return (error);
285: }
286:
1.3 andrew 287: int
1.1 cgd 288: sodisconnect(so)
289: register struct socket *so;
290: {
1.20 mycroft 291: int s = splsoftnet();
1.1 cgd 292: int error;
293:
294: if ((so->so_state & SS_ISCONNECTED) == 0) {
295: error = ENOTCONN;
296: goto bad;
297: }
298: if (so->so_state & SS_ISDISCONNECTING) {
299: error = EALREADY;
300: goto bad;
301: }
1.22 mycroft 302: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
303: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0,
304: (struct proc *)0);
1.1 cgd 305: bad:
306: splx(s);
307: return (error);
308: }
309:
1.15 mycroft 310: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 311: /*
312: * Send on a socket.
313: * If send must go all at once and message is larger than
314: * send buffering, then hard error.
315: * Lock against other senders.
316: * If must go all at once and not enough room now, then
317: * inform user that this would block and do nothing.
318: * Otherwise, if nonblocking, send as much as possible.
319: * The data to be sent is described by "uio" if nonzero,
320: * otherwise by the mbuf chain "top" (which must be null
321: * if uio is not). Data provided in mbuf chain must be small
322: * enough to send all at once.
323: *
324: * Returns nonzero on error, timeout or signal; callers
325: * must check for short counts if EINTR/ERESTART are returned.
326: * Data and control buffers are freed on return.
327: */
1.3 andrew 328: int
1.1 cgd 329: sosend(so, addr, uio, top, control, flags)
330: register struct socket *so;
331: struct mbuf *addr;
332: struct uio *uio;
333: struct mbuf *top;
334: struct mbuf *control;
335: int flags;
336: {
1.15 mycroft 337: struct proc *p = curproc; /* XXX */
1.1 cgd 338: struct mbuf **mp;
339: register struct mbuf *m;
340: register long space, len, resid;
341: int clen = 0, error, s, dontroute, mlen;
342: int atomic = sosendallatonce(so) || top;
343:
344: if (uio)
345: resid = uio->uio_resid;
346: else
347: resid = top->m_pkthdr.len;
1.7 cgd 348: /*
349: * In theory resid should be unsigned.
350: * However, space must be signed, as it might be less than 0
351: * if we over-committed, and we must use a signed comparison
352: * of space and resid. On the other hand, a negative resid
353: * causes us to loop sending 0-length segments to the protocol.
354: */
1.29 mycroft 355: if (resid < 0) {
356: error = EINVAL;
357: goto out;
358: }
1.1 cgd 359: dontroute =
360: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
361: (so->so_proto->pr_flags & PR_ATOMIC);
1.12 mycroft 362: p->p_stats->p_ru.ru_msgsnd++;
1.1 cgd 363: if (control)
364: clen = control->m_len;
365: #define snderr(errno) { error = errno; splx(s); goto release; }
366:
367: restart:
1.21 christos 368: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 369: goto out;
370: do {
1.20 mycroft 371: s = splsoftnet();
1.1 cgd 372: if (so->so_state & SS_CANTSENDMORE)
373: snderr(EPIPE);
374: if (so->so_error)
375: snderr(so->so_error);
376: if ((so->so_state & SS_ISCONNECTED) == 0) {
377: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
378: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
379: !(resid == 0 && clen != 0))
380: snderr(ENOTCONN);
381: } else if (addr == 0)
382: snderr(EDESTADDRREQ);
383: }
384: space = sbspace(&so->so_snd);
385: if (flags & MSG_OOB)
386: space += 1024;
1.21 christos 387: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.11 mycroft 388: clen > so->so_snd.sb_hiwat)
389: snderr(EMSGSIZE);
390: if (space < resid + clen && uio &&
1.1 cgd 391: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
392: if (so->so_state & SS_NBIO)
393: snderr(EWOULDBLOCK);
394: sbunlock(&so->so_snd);
395: error = sbwait(&so->so_snd);
396: splx(s);
397: if (error)
398: goto out;
399: goto restart;
400: }
401: splx(s);
402: mp = ⊤
403: space -= clen;
404: do {
405: if (uio == NULL) {
406: /*
407: * Data is prepackaged in "top".
408: */
409: resid = 0;
410: if (flags & MSG_EOR)
411: top->m_flags |= M_EOR;
412: } else do {
413: if (top == 0) {
414: MGETHDR(m, M_WAIT, MT_DATA);
415: mlen = MHLEN;
416: m->m_pkthdr.len = 0;
417: m->m_pkthdr.rcvif = (struct ifnet *)0;
418: } else {
419: MGET(m, M_WAIT, MT_DATA);
420: mlen = MLEN;
421: }
1.15 mycroft 422: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.1 cgd 423: MCLGET(m, M_WAIT);
424: if ((m->m_flags & M_EXT) == 0)
425: goto nopages;
426: mlen = MCLBYTES;
1.15 mycroft 427: #ifdef MAPPED_MBUFS
428: len = min(MCLBYTES, resid);
429: #else
430: if (atomic && top == 0) {
431: len = min(MCLBYTES - max_hdr, resid);
432: m->m_data += max_hdr;
433: } else
434: len = min(MCLBYTES, resid);
435: #endif
1.25 explorer 436: space -= len;
1.1 cgd 437: } else {
438: nopages:
439: len = min(min(mlen, resid), space);
1.15 mycroft 440: space -= len;
1.1 cgd 441: /*
442: * For datagram protocols, leave room
443: * for protocol headers in first mbuf.
444: */
445: if (atomic && top == 0 && len < mlen)
446: MH_ALIGN(m, len);
447: }
448: error = uiomove(mtod(m, caddr_t), (int)len, uio);
449: resid = uio->uio_resid;
450: m->m_len = len;
451: *mp = m;
452: top->m_pkthdr.len += len;
453: if (error)
454: goto release;
455: mp = &m->m_next;
456: if (resid <= 0) {
457: if (flags & MSG_EOR)
458: top->m_flags |= M_EOR;
459: break;
460: }
461: } while (space > 0 && atomic);
462: if (dontroute)
463: so->so_options |= SO_DONTROUTE;
1.20 mycroft 464: s = splsoftnet(); /* XXX */
1.22 mycroft 465: error = (*so->so_proto->pr_usrreq)(so,
1.24 mycroft 466: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
467: top, addr, control, p);
1.1 cgd 468: splx(s);
469: if (dontroute)
470: so->so_options &= ~SO_DONTROUTE;
471: clen = 0;
472: control = 0;
473: top = 0;
474: mp = ⊤
475: if (error)
476: goto release;
477: } while (resid && space > 0);
478: } while (resid);
479:
480: release:
481: sbunlock(&so->so_snd);
482: out:
483: if (top)
484: m_freem(top);
485: if (control)
486: m_freem(control);
487: return (error);
488: }
489:
490: /*
491: * Implement receive operations on a socket.
492: * We depend on the way that records are added to the sockbuf
493: * by sbappend*. In particular, each record (mbufs linked through m_next)
494: * must begin with an address if the protocol so specifies,
495: * followed by an optional mbuf or mbufs containing ancillary data,
496: * and then zero or more mbufs of data.
497: * In order to avoid blocking network interrupts for the entire time here,
498: * we splx() while doing the actual copy to user space.
499: * Although the sockbuf is locked, new data may still be appended,
500: * and thus we must maintain consistency of the sockbuf during that time.
501: *
502: * The caller may receive the data as a single mbuf chain by supplying
503: * an mbuf **mp0 for use in returning the chain. The uio is then used
504: * only for the count in uio_resid.
505: */
1.3 andrew 506: int
1.1 cgd 507: soreceive(so, paddr, uio, mp0, controlp, flagsp)
508: register struct socket *so;
509: struct mbuf **paddr;
510: struct uio *uio;
511: struct mbuf **mp0;
512: struct mbuf **controlp;
513: int *flagsp;
514: {
515: register struct mbuf *m, **mp;
516: register int flags, len, error, s, offset;
517: struct protosw *pr = so->so_proto;
518: struct mbuf *nextrecord;
1.21 christos 519: int moff, type = 0;
1.3 andrew 520: int orig_resid = uio->uio_resid;
1.1 cgd 521:
522: mp = mp0;
523: if (paddr)
524: *paddr = 0;
525: if (controlp)
526: *controlp = 0;
527: if (flagsp)
528: flags = *flagsp &~ MSG_EOR;
529: else
530: flags = 0;
531: if (flags & MSG_OOB) {
532: m = m_get(M_WAIT, MT_DATA);
1.17 cgd 533: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.22 mycroft 534: (struct mbuf *)(long)(flags & MSG_PEEK), (struct mbuf *)0,
535: (struct proc *)0);
1.1 cgd 536: if (error)
537: goto bad;
538: do {
539: error = uiomove(mtod(m, caddr_t),
540: (int) min(uio->uio_resid, m->m_len), uio);
541: m = m_free(m);
542: } while (uio->uio_resid && error == 0 && m);
543: bad:
544: if (m)
545: m_freem(m);
546: return (error);
547: }
548: if (mp)
549: *mp = (struct mbuf *)0;
550: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.22 mycroft 551: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
552: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 553:
554: restart:
1.21 christos 555: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0)
1.1 cgd 556: return (error);
1.20 mycroft 557: s = splsoftnet();
1.1 cgd 558:
559: m = so->so_rcv.sb_mb;
560: /*
561: * If we have less data than requested, block awaiting more
562: * (subject to any timeout) if:
1.15 mycroft 563: * 1. the current count is less than the low water mark,
1.1 cgd 564: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 565: * receive operation at once if we block (resid <= hiwat), or
566: * 3. MSG_DONTWAIT is not set.
1.1 cgd 567: * If MSG_WAITALL is set but resid is larger than the receive buffer,
568: * we have to do the receive in sections, and thus risk returning
569: * a short count if a timeout or signal occurs after we start.
570: */
1.21 christos 571: if (m == 0 || (((flags & MSG_DONTWAIT) == 0 &&
1.15 mycroft 572: so->so_rcv.sb_cc < uio->uio_resid) &&
1.1 cgd 573: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
574: ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.21 christos 575: m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) {
1.1 cgd 576: #ifdef DIAGNOSTIC
577: if (m == 0 && so->so_rcv.sb_cc)
578: panic("receive 1");
579: #endif
580: if (so->so_error) {
581: if (m)
1.15 mycroft 582: goto dontblock;
1.1 cgd 583: error = so->so_error;
584: if ((flags & MSG_PEEK) == 0)
585: so->so_error = 0;
586: goto release;
587: }
588: if (so->so_state & SS_CANTRCVMORE) {
589: if (m)
1.15 mycroft 590: goto dontblock;
1.1 cgd 591: else
592: goto release;
593: }
594: for (; m; m = m->m_next)
595: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
596: m = so->so_rcv.sb_mb;
597: goto dontblock;
598: }
599: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
600: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
601: error = ENOTCONN;
602: goto release;
603: }
604: if (uio->uio_resid == 0)
605: goto release;
1.15 mycroft 606: if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) {
1.1 cgd 607: error = EWOULDBLOCK;
608: goto release;
609: }
610: sbunlock(&so->so_rcv);
611: error = sbwait(&so->so_rcv);
612: splx(s);
613: if (error)
614: return (error);
615: goto restart;
616: }
617: dontblock:
1.15 mycroft 618: #ifdef notyet /* XXXX */
619: if (uio->uio_procp)
620: uio->uio_procp->p_stats->p_ru.ru_msgrcv++;
621: #endif
1.1 cgd 622: nextrecord = m->m_nextpkt;
623: if (pr->pr_flags & PR_ADDR) {
624: #ifdef DIAGNOSTIC
625: if (m->m_type != MT_SONAME)
626: panic("receive 1a");
627: #endif
1.3 andrew 628: orig_resid = 0;
1.1 cgd 629: if (flags & MSG_PEEK) {
630: if (paddr)
631: *paddr = m_copy(m, 0, m->m_len);
632: m = m->m_next;
633: } else {
634: sbfree(&so->so_rcv, m);
635: if (paddr) {
636: *paddr = m;
637: so->so_rcv.sb_mb = m->m_next;
638: m->m_next = 0;
639: m = so->so_rcv.sb_mb;
640: } else {
641: MFREE(m, so->so_rcv.sb_mb);
642: m = so->so_rcv.sb_mb;
643: }
644: }
645: }
646: while (m && m->m_type == MT_CONTROL && error == 0) {
647: if (flags & MSG_PEEK) {
648: if (controlp)
649: *controlp = m_copy(m, 0, m->m_len);
650: m = m->m_next;
651: } else {
652: sbfree(&so->so_rcv, m);
653: if (controlp) {
654: if (pr->pr_domain->dom_externalize &&
655: mtod(m, struct cmsghdr *)->cmsg_type ==
656: SCM_RIGHTS)
657: error = (*pr->pr_domain->dom_externalize)(m);
658: *controlp = m;
659: so->so_rcv.sb_mb = m->m_next;
660: m->m_next = 0;
661: m = so->so_rcv.sb_mb;
662: } else {
663: MFREE(m, so->so_rcv.sb_mb);
664: m = so->so_rcv.sb_mb;
665: }
666: }
1.3 andrew 667: if (controlp) {
668: orig_resid = 0;
1.1 cgd 669: controlp = &(*controlp)->m_next;
1.3 andrew 670: }
1.1 cgd 671: }
672: if (m) {
673: if ((flags & MSG_PEEK) == 0)
674: m->m_nextpkt = nextrecord;
675: type = m->m_type;
676: if (type == MT_OOBDATA)
677: flags |= MSG_OOB;
678: }
679: moff = 0;
680: offset = 0;
681: while (m && uio->uio_resid > 0 && error == 0) {
682: if (m->m_type == MT_OOBDATA) {
683: if (type != MT_OOBDATA)
684: break;
685: } else if (type == MT_OOBDATA)
686: break;
687: #ifdef DIAGNOSTIC
688: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
689: panic("receive 3");
690: #endif
691: so->so_state &= ~SS_RCVATMARK;
692: len = uio->uio_resid;
693: if (so->so_oobmark && len > so->so_oobmark - offset)
694: len = so->so_oobmark - offset;
695: if (len > m->m_len - moff)
696: len = m->m_len - moff;
697: /*
698: * If mp is set, just pass back the mbufs.
699: * Otherwise copy them out via the uio, then free.
700: * Sockbuf must be consistent here (points to current mbuf,
701: * it points to next record) when we drop priority;
702: * we must note any additions to the sockbuf when we
703: * block interrupts again.
704: */
705: if (mp == 0) {
706: splx(s);
707: error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio);
1.20 mycroft 708: s = splsoftnet();
1.1 cgd 709: } else
710: uio->uio_resid -= len;
711: if (len == m->m_len - moff) {
712: if (m->m_flags & M_EOR)
713: flags |= MSG_EOR;
714: if (flags & MSG_PEEK) {
715: m = m->m_next;
716: moff = 0;
717: } else {
718: nextrecord = m->m_nextpkt;
719: sbfree(&so->so_rcv, m);
720: if (mp) {
721: *mp = m;
722: mp = &m->m_next;
723: so->so_rcv.sb_mb = m = m->m_next;
724: *mp = (struct mbuf *)0;
725: } else {
726: MFREE(m, so->so_rcv.sb_mb);
727: m = so->so_rcv.sb_mb;
728: }
729: if (m)
730: m->m_nextpkt = nextrecord;
731: }
732: } else {
733: if (flags & MSG_PEEK)
734: moff += len;
735: else {
736: if (mp)
737: *mp = m_copym(m, 0, len, M_WAIT);
738: m->m_data += len;
739: m->m_len -= len;
740: so->so_rcv.sb_cc -= len;
741: }
742: }
743: if (so->so_oobmark) {
744: if ((flags & MSG_PEEK) == 0) {
745: so->so_oobmark -= len;
746: if (so->so_oobmark == 0) {
747: so->so_state |= SS_RCVATMARK;
748: break;
749: }
1.7 cgd 750: } else {
1.1 cgd 751: offset += len;
1.7 cgd 752: if (offset == so->so_oobmark)
753: break;
754: }
1.1 cgd 755: }
756: if (flags & MSG_EOR)
757: break;
758: /*
759: * If the MSG_WAITALL flag is set (for non-atomic socket),
760: * we must not quit until "uio->uio_resid == 0" or an error
761: * termination. If a signal/timeout occurs, return
762: * with a short count but without error.
763: * Keep sockbuf locked against other readers.
764: */
765: while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 &&
1.3 andrew 766: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 767: if (so->so_error || so->so_state & SS_CANTRCVMORE)
768: break;
769: error = sbwait(&so->so_rcv);
770: if (error) {
771: sbunlock(&so->so_rcv);
772: splx(s);
773: return (0);
774: }
1.21 christos 775: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 776: nextrecord = m->m_nextpkt;
777: }
778: }
1.3 andrew 779:
780: if (m && pr->pr_flags & PR_ATOMIC) {
781: flags |= MSG_TRUNC;
782: if ((flags & MSG_PEEK) == 0)
783: (void) sbdroprecord(&so->so_rcv);
784: }
1.1 cgd 785: if ((flags & MSG_PEEK) == 0) {
786: if (m == 0)
787: so->so_rcv.sb_mb = nextrecord;
788: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.22 mycroft 789: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
790: (struct mbuf *)(long)flags, (struct mbuf *)0,
791: (struct proc *)0);
1.1 cgd 792: }
1.3 andrew 793: if (orig_resid == uio->uio_resid && orig_resid &&
794: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
795: sbunlock(&so->so_rcv);
796: splx(s);
797: goto restart;
798: }
799:
1.1 cgd 800: if (flagsp)
801: *flagsp |= flags;
802: release:
803: sbunlock(&so->so_rcv);
804: splx(s);
805: return (error);
806: }
807:
1.14 mycroft 808: int
1.1 cgd 809: soshutdown(so, how)
810: register struct socket *so;
811: register int how;
812: {
813: register struct protosw *pr = so->so_proto;
814:
815: how++;
816: if (how & FREAD)
817: sorflush(so);
818: if (how & FWRITE)
1.22 mycroft 819: return (*pr->pr_usrreq)(so, PRU_SHUTDOWN, (struct mbuf *)0,
820: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 821: return (0);
822: }
823:
1.14 mycroft 824: void
1.1 cgd 825: sorflush(so)
826: register struct socket *so;
827: {
828: register struct sockbuf *sb = &so->so_rcv;
829: register struct protosw *pr = so->so_proto;
830: register int s;
831: struct sockbuf asb;
832:
833: sb->sb_flags |= SB_NOINTR;
1.15 mycroft 834: (void) sblock(sb, M_WAITOK);
1.1 cgd 835: s = splimp();
836: socantrcvmore(so);
837: sbunlock(sb);
838: asb = *sb;
839: bzero((caddr_t)sb, sizeof (*sb));
840: splx(s);
841: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
842: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
843: sbrelease(&asb);
844: }
845:
1.14 mycroft 846: int
1.1 cgd 847: sosetopt(so, level, optname, m0)
848: register struct socket *so;
849: int level, optname;
850: struct mbuf *m0;
851: {
852: int error = 0;
853: register struct mbuf *m = m0;
854:
855: if (level != SOL_SOCKET) {
856: if (so->so_proto && so->so_proto->pr_ctloutput)
857: return ((*so->so_proto->pr_ctloutput)
858: (PRCO_SETOPT, so, level, optname, &m0));
859: error = ENOPROTOOPT;
860: } else {
861: switch (optname) {
862:
863: case SO_LINGER:
864: if (m == NULL || m->m_len != sizeof (struct linger)) {
865: error = EINVAL;
866: goto bad;
867: }
868: so->so_linger = mtod(m, struct linger *)->l_linger;
869: /* fall thru... */
870:
871: case SO_DEBUG:
872: case SO_KEEPALIVE:
873: case SO_DONTROUTE:
874: case SO_USELOOPBACK:
875: case SO_BROADCAST:
876: case SO_REUSEADDR:
1.15 mycroft 877: case SO_REUSEPORT:
1.1 cgd 878: case SO_OOBINLINE:
1.26 thorpej 879: case SO_TIMESTAMP:
1.1 cgd 880: if (m == NULL || m->m_len < sizeof (int)) {
881: error = EINVAL;
882: goto bad;
883: }
884: if (*mtod(m, int *))
885: so->so_options |= optname;
886: else
887: so->so_options &= ~optname;
888: break;
889:
890: case SO_SNDBUF:
891: case SO_RCVBUF:
892: case SO_SNDLOWAT:
893: case SO_RCVLOWAT:
1.28 thorpej 894: {
895: int optval;
896:
1.1 cgd 897: if (m == NULL || m->m_len < sizeof (int)) {
898: error = EINVAL;
899: goto bad;
900: }
1.28 thorpej 901:
902: /*
903: * Values < 1 make no sense for any of these
904: * options, so disallow them.
905: */
906: optval = *mtod(m, int *);
907: if (optval < 1) {
908: error = EINVAL;
909: goto bad;
910: }
911:
1.1 cgd 912: switch (optname) {
913:
914: case SO_SNDBUF:
915: case SO_RCVBUF:
916: if (sbreserve(optname == SO_SNDBUF ?
917: &so->so_snd : &so->so_rcv,
1.28 thorpej 918: (u_long) optval) == 0) {
1.1 cgd 919: error = ENOBUFS;
920: goto bad;
921: }
922: break;
923:
1.28 thorpej 924: /*
925: * Make sure the low-water is never greater than
926: * the high-water.
927: */
1.1 cgd 928: case SO_SNDLOWAT:
1.28 thorpej 929: so->so_snd.sb_lowat =
930: (optval > so->so_snd.sb_hiwat) ?
931: so->so_snd.sb_hiwat : optval;
1.1 cgd 932: break;
933: case SO_RCVLOWAT:
1.28 thorpej 934: so->so_rcv.sb_lowat =
935: (optval > so->so_rcv.sb_hiwat) ?
936: so->so_rcv.sb_hiwat : optval;
1.1 cgd 937: break;
938: }
939: break;
1.28 thorpej 940: }
1.1 cgd 941:
942: case SO_SNDTIMEO:
943: case SO_RCVTIMEO:
944: {
945: struct timeval *tv;
946: short val;
947:
948: if (m == NULL || m->m_len < sizeof (*tv)) {
949: error = EINVAL;
950: goto bad;
951: }
952: tv = mtod(m, struct timeval *);
1.19 cgd 953: if (tv->tv_sec * hz + tv->tv_usec / tick > SHRT_MAX) {
1.1 cgd 954: error = EDOM;
955: goto bad;
956: }
957: val = tv->tv_sec * hz + tv->tv_usec / tick;
958:
959: switch (optname) {
960:
961: case SO_SNDTIMEO:
962: so->so_snd.sb_timeo = val;
963: break;
964: case SO_RCVTIMEO:
965: so->so_rcv.sb_timeo = val;
966: break;
967: }
968: break;
969: }
970:
971: default:
972: error = ENOPROTOOPT;
973: break;
974: }
1.15 mycroft 975: if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
976: (void) ((*so->so_proto->pr_ctloutput)
977: (PRCO_SETOPT, so, level, optname, &m0));
978: m = NULL; /* freed by protocol */
979: }
1.1 cgd 980: }
981: bad:
982: if (m)
983: (void) m_free(m);
984: return (error);
985: }
986:
1.14 mycroft 987: int
1.1 cgd 988: sogetopt(so, level, optname, mp)
989: register struct socket *so;
990: int level, optname;
991: struct mbuf **mp;
992: {
993: register struct mbuf *m;
994:
995: if (level != SOL_SOCKET) {
996: if (so->so_proto && so->so_proto->pr_ctloutput) {
997: return ((*so->so_proto->pr_ctloutput)
998: (PRCO_GETOPT, so, level, optname, mp));
999: } else
1000: return (ENOPROTOOPT);
1001: } else {
1002: m = m_get(M_WAIT, MT_SOOPTS);
1003: m->m_len = sizeof (int);
1004:
1005: switch (optname) {
1006:
1007: case SO_LINGER:
1008: m->m_len = sizeof (struct linger);
1009: mtod(m, struct linger *)->l_onoff =
1010: so->so_options & SO_LINGER;
1011: mtod(m, struct linger *)->l_linger = so->so_linger;
1012: break;
1013:
1014: case SO_USELOOPBACK:
1015: case SO_DONTROUTE:
1016: case SO_DEBUG:
1017: case SO_KEEPALIVE:
1018: case SO_REUSEADDR:
1.15 mycroft 1019: case SO_REUSEPORT:
1.1 cgd 1020: case SO_BROADCAST:
1021: case SO_OOBINLINE:
1.26 thorpej 1022: case SO_TIMESTAMP:
1.1 cgd 1023: *mtod(m, int *) = so->so_options & optname;
1024: break;
1025:
1026: case SO_TYPE:
1027: *mtod(m, int *) = so->so_type;
1028: break;
1029:
1030: case SO_ERROR:
1031: *mtod(m, int *) = so->so_error;
1032: so->so_error = 0;
1033: break;
1034:
1035: case SO_SNDBUF:
1036: *mtod(m, int *) = so->so_snd.sb_hiwat;
1037: break;
1038:
1039: case SO_RCVBUF:
1040: *mtod(m, int *) = so->so_rcv.sb_hiwat;
1041: break;
1042:
1043: case SO_SNDLOWAT:
1044: *mtod(m, int *) = so->so_snd.sb_lowat;
1045: break;
1046:
1047: case SO_RCVLOWAT:
1048: *mtod(m, int *) = so->so_rcv.sb_lowat;
1049: break;
1050:
1051: case SO_SNDTIMEO:
1052: case SO_RCVTIMEO:
1053: {
1054: int val = (optname == SO_SNDTIMEO ?
1055: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1056:
1057: m->m_len = sizeof(struct timeval);
1058: mtod(m, struct timeval *)->tv_sec = val / hz;
1059: mtod(m, struct timeval *)->tv_usec =
1.27 kleink 1060: (val % hz) * tick;
1.1 cgd 1061: break;
1062: }
1063:
1064: default:
1065: (void)m_free(m);
1066: return (ENOPROTOOPT);
1067: }
1068: *mp = m;
1069: return (0);
1070: }
1071: }
1072:
1.14 mycroft 1073: void
1.1 cgd 1074: sohasoutofband(so)
1075: register struct socket *so;
1076: {
1077: struct proc *p;
1078:
1079: if (so->so_pgid < 0)
1080: gsignal(-so->so_pgid, SIGURG);
1081: else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0)
1082: psignal(p, SIGURG);
1.2 cgd 1083: selwakeup(&so->so_rcv.sb_sel);
1.1 cgd 1084: }