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1.48 ! thorpej 1: /* $NetBSD: uipc_socket.c,v 1.47 1999/05/15 22:37:22 sommerfeld 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: *
1.32 fvdl 35: * @(#)uipc_socket.c 8.6 (Berkeley) 5/2/95
1.1 cgd 36: */
1.35 thorpej 37:
38: #include "opt_compat_sunos.h"
1.1 cgd 39:
1.9 mycroft 40: #include <sys/param.h>
41: #include <sys/systm.h>
42: #include <sys/proc.h>
43: #include <sys/file.h>
44: #include <sys/malloc.h>
45: #include <sys/mbuf.h>
46: #include <sys/domain.h>
47: #include <sys/kernel.h>
48: #include <sys/protosw.h>
49: #include <sys/socket.h>
50: #include <sys/socketvar.h>
1.21 christos 51: #include <sys/signalvar.h>
1.9 mycroft 52: #include <sys/resourcevar.h>
1.37 thorpej 53: #include <sys/pool.h>
54:
55: struct pool socket_pool;
56:
57: void
58: soinit()
59: {
60:
61: pool_init(&socket_pool, sizeof(struct socket), 0, 0, 0,
62: "sockpl", 0, NULL, NULL, M_SOCKET);
63: }
1.1 cgd 64:
65: /*
66: * Socket operation routines.
67: * These routines are called by the routines in
68: * sys_socket.c or from a system process, and
69: * implement the semantics of socket operations by
70: * switching out to the protocol specific routines.
71: */
72: /*ARGSUSED*/
1.3 andrew 73: int
1.1 cgd 74: socreate(dom, aso, type, proto)
1.11 mycroft 75: int dom;
1.1 cgd 76: struct socket **aso;
77: register int type;
78: int proto;
79: {
80: struct proc *p = curproc; /* XXX */
81: register struct protosw *prp;
82: register struct socket *so;
83: register int error;
1.39 matt 84: int s;
1.1 cgd 85:
86: if (proto)
87: prp = pffindproto(dom, proto, type);
88: else
89: prp = pffindtype(dom, type);
1.15 mycroft 90: if (prp == 0 || prp->pr_usrreq == 0)
1.1 cgd 91: return (EPROTONOSUPPORT);
92: if (prp->pr_type != type)
93: return (EPROTOTYPE);
1.39 matt 94: s = splsoftnet();
1.37 thorpej 95: so = pool_get(&socket_pool, PR_WAITOK);
1.38 perry 96: memset((caddr_t)so, 0, sizeof(*so));
1.31 thorpej 97: TAILQ_INIT(&so->so_q0);
98: TAILQ_INIT(&so->so_q);
1.1 cgd 99: so->so_type = type;
100: so->so_proto = prp;
1.33 matt 101: so->so_send = sosend;
102: so->so_receive = soreceive;
1.44 lukem 103: if (p != 0)
104: so->so_uid = p->p_ucred->cr_uid;
1.22 mycroft 105: error = (*prp->pr_usrreq)(so, PRU_ATTACH, (struct mbuf *)0,
106: (struct mbuf *)(long)proto, (struct mbuf *)0, p);
1.1 cgd 107: if (error) {
108: so->so_state |= SS_NOFDREF;
109: sofree(so);
1.39 matt 110: splx(s);
1.1 cgd 111: return (error);
112: }
1.10 deraadt 113: #ifdef COMPAT_SUNOS
1.18 christos 114: {
115: extern struct emul emul_sunos;
116: if (p->p_emul == &emul_sunos && type == SOCK_DGRAM)
117: so->so_options |= SO_BROADCAST;
118: }
1.10 deraadt 119: #endif
1.39 matt 120: splx(s);
1.1 cgd 121: *aso = so;
122: return (0);
123: }
124:
1.3 andrew 125: int
1.1 cgd 126: sobind(so, nam)
127: struct socket *so;
128: struct mbuf *nam;
129: {
1.22 mycroft 130: struct proc *p = curproc; /* XXX */
1.20 mycroft 131: int s = splsoftnet();
1.1 cgd 132: int error;
133:
1.22 mycroft 134: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, (struct mbuf *)0,
135: nam, (struct mbuf *)0, p);
1.1 cgd 136: splx(s);
137: return (error);
138: }
139:
1.3 andrew 140: int
1.1 cgd 141: solisten(so, backlog)
142: register struct socket *so;
143: int backlog;
144: {
1.20 mycroft 145: int s = splsoftnet(), error;
1.1 cgd 146:
1.22 mycroft 147: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, (struct mbuf *)0,
148: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 149: if (error) {
150: splx(s);
151: return (error);
152: }
1.31 thorpej 153: if (so->so_q.tqh_first == NULL)
1.1 cgd 154: so->so_options |= SO_ACCEPTCONN;
155: if (backlog < 0)
156: backlog = 0;
157: so->so_qlimit = min(backlog, SOMAXCONN);
158: splx(s);
159: return (0);
160: }
161:
1.21 christos 162: void
1.1 cgd 163: sofree(so)
164: register struct socket *so;
165: {
166:
1.43 mycroft 167: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
1.1 cgd 168: return;
1.43 mycroft 169: if (so->so_head) {
170: /*
171: * We must not decommission a socket that's on the accept(2)
172: * queue. If we do, then accept(2) may hang after select(2)
173: * indicated that the listening socket was ready.
174: */
175: if (!soqremque(so, 0))
176: return;
177: }
1.1 cgd 178: sbrelease(&so->so_snd);
179: sorflush(so);
1.37 thorpej 180: pool_put(&socket_pool, so);
1.1 cgd 181: }
182:
183: /*
184: * Close a socket on last file table reference removal.
185: * Initiate disconnect if connected.
186: * Free socket when disconnect complete.
187: */
1.3 andrew 188: int
1.1 cgd 189: soclose(so)
190: register struct socket *so;
191: {
1.41 mycroft 192: struct socket *so2;
1.20 mycroft 193: int s = splsoftnet(); /* conservative */
1.1 cgd 194: int error = 0;
195:
196: if (so->so_options & SO_ACCEPTCONN) {
1.41 mycroft 197: while ((so2 = so->so_q0.tqh_first) != 0) {
1.42 mycroft 198: (void) soqremque(so2, 0);
1.41 mycroft 199: (void) soabort(so2);
200: }
201: while ((so2 = so->so_q.tqh_first) != 0) {
1.42 mycroft 202: (void) soqremque(so2, 1);
1.41 mycroft 203: (void) soabort(so2);
204: }
1.1 cgd 205: }
206: if (so->so_pcb == 0)
207: goto discard;
208: if (so->so_state & SS_ISCONNECTED) {
209: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
210: error = sodisconnect(so);
211: if (error)
212: goto drop;
213: }
214: if (so->so_options & SO_LINGER) {
215: if ((so->so_state & SS_ISDISCONNECTING) &&
216: (so->so_state & SS_NBIO))
217: goto drop;
1.21 christos 218: while (so->so_state & SS_ISCONNECTED) {
219: error = tsleep((caddr_t)&so->so_timeo,
220: PSOCK | PCATCH, netcls,
1.30 thorpej 221: so->so_linger * hz);
1.21 christos 222: if (error)
1.1 cgd 223: break;
1.21 christos 224: }
1.1 cgd 225: }
226: }
227: drop:
228: if (so->so_pcb) {
1.22 mycroft 229: int error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
230: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0,
231: (struct proc *)0);
1.1 cgd 232: if (error == 0)
233: error = error2;
234: }
235: discard:
236: if (so->so_state & SS_NOFDREF)
237: panic("soclose: NOFDREF");
238: so->so_state |= SS_NOFDREF;
239: sofree(so);
240: splx(s);
241: return (error);
242: }
243:
244: /*
1.20 mycroft 245: * Must be called at splsoftnet...
1.1 cgd 246: */
1.3 andrew 247: int
1.1 cgd 248: soabort(so)
249: struct socket *so;
250: {
251:
1.22 mycroft 252: return (*so->so_proto->pr_usrreq)(so, PRU_ABORT, (struct mbuf *)0,
253: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 254: }
255:
1.3 andrew 256: int
1.1 cgd 257: soaccept(so, nam)
258: register struct socket *so;
259: struct mbuf *nam;
260: {
1.20 mycroft 261: int s = splsoftnet();
1.1 cgd 262: int error;
263:
264: if ((so->so_state & SS_NOFDREF) == 0)
265: panic("soaccept: !NOFDREF");
266: so->so_state &= ~SS_NOFDREF;
1.41 mycroft 267: if ((so->so_state & SS_ISDISCONNECTED) == 0)
268: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
269: (struct mbuf *)0, nam, (struct mbuf *)0, (struct proc *)0);
270: else
271: error = 0;
1.1 cgd 272: splx(s);
273: return (error);
274: }
275:
1.3 andrew 276: int
1.1 cgd 277: soconnect(so, nam)
278: register struct socket *so;
279: struct mbuf *nam;
280: {
1.23 mycroft 281: struct proc *p = curproc; /* XXX */
1.1 cgd 282: int s;
283: int error;
284:
285: if (so->so_options & SO_ACCEPTCONN)
286: return (EOPNOTSUPP);
1.20 mycroft 287: s = splsoftnet();
1.1 cgd 288: /*
289: * If protocol is connection-based, can only connect once.
290: * Otherwise, if connected, try to disconnect first.
291: * This allows user to disconnect by connecting to, e.g.,
292: * a null address.
293: */
294: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
295: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
296: (error = sodisconnect(so))))
297: error = EISCONN;
298: else
299: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.23 mycroft 300: (struct mbuf *)0, nam, (struct mbuf *)0, p);
1.1 cgd 301: splx(s);
302: return (error);
303: }
304:
1.3 andrew 305: int
1.1 cgd 306: soconnect2(so1, so2)
307: register struct socket *so1;
308: struct socket *so2;
309: {
1.20 mycroft 310: int s = splsoftnet();
1.1 cgd 311: int error;
312:
1.22 mycroft 313: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
314: (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0,
315: (struct proc *)0);
1.1 cgd 316: splx(s);
317: return (error);
318: }
319:
1.3 andrew 320: int
1.1 cgd 321: sodisconnect(so)
322: register struct socket *so;
323: {
1.20 mycroft 324: int s = splsoftnet();
1.1 cgd 325: int error;
326:
327: if ((so->so_state & SS_ISCONNECTED) == 0) {
328: error = ENOTCONN;
329: goto bad;
330: }
331: if (so->so_state & SS_ISDISCONNECTING) {
332: error = EALREADY;
333: goto bad;
334: }
1.22 mycroft 335: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
336: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0,
337: (struct proc *)0);
1.1 cgd 338: bad:
339: splx(s);
340: return (error);
341: }
342:
1.15 mycroft 343: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 344: /*
345: * Send on a socket.
346: * If send must go all at once and message is larger than
347: * send buffering, then hard error.
348: * Lock against other senders.
349: * If must go all at once and not enough room now, then
350: * inform user that this would block and do nothing.
351: * Otherwise, if nonblocking, send as much as possible.
352: * The data to be sent is described by "uio" if nonzero,
353: * otherwise by the mbuf chain "top" (which must be null
354: * if uio is not). Data provided in mbuf chain must be small
355: * enough to send all at once.
356: *
357: * Returns nonzero on error, timeout or signal; callers
358: * must check for short counts if EINTR/ERESTART are returned.
359: * Data and control buffers are freed on return.
360: */
1.3 andrew 361: int
1.1 cgd 362: sosend(so, addr, uio, top, control, flags)
363: register struct socket *so;
364: struct mbuf *addr;
365: struct uio *uio;
366: struct mbuf *top;
367: struct mbuf *control;
368: int flags;
369: {
1.15 mycroft 370: struct proc *p = curproc; /* XXX */
1.1 cgd 371: struct mbuf **mp;
372: register struct mbuf *m;
373: register long space, len, resid;
374: int clen = 0, error, s, dontroute, mlen;
375: int atomic = sosendallatonce(so) || top;
376:
377: if (uio)
378: resid = uio->uio_resid;
379: else
380: resid = top->m_pkthdr.len;
1.7 cgd 381: /*
382: * In theory resid should be unsigned.
383: * However, space must be signed, as it might be less than 0
384: * if we over-committed, and we must use a signed comparison
385: * of space and resid. On the other hand, a negative resid
386: * causes us to loop sending 0-length segments to the protocol.
387: */
1.29 mycroft 388: if (resid < 0) {
389: error = EINVAL;
390: goto out;
391: }
1.1 cgd 392: dontroute =
393: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
394: (so->so_proto->pr_flags & PR_ATOMIC);
1.12 mycroft 395: p->p_stats->p_ru.ru_msgsnd++;
1.1 cgd 396: if (control)
397: clen = control->m_len;
398: #define snderr(errno) { error = errno; splx(s); goto release; }
399:
400: restart:
1.21 christos 401: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 402: goto out;
403: do {
1.20 mycroft 404: s = splsoftnet();
1.1 cgd 405: if (so->so_state & SS_CANTSENDMORE)
406: snderr(EPIPE);
1.48 ! thorpej 407: if (so->so_error) {
! 408: error = so->so_error;
! 409: so->so_error = 0;
! 410: splx(s);
! 411: goto release;
! 412: }
1.1 cgd 413: if ((so->so_state & SS_ISCONNECTED) == 0) {
414: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
415: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
416: !(resid == 0 && clen != 0))
417: snderr(ENOTCONN);
418: } else if (addr == 0)
419: snderr(EDESTADDRREQ);
420: }
421: space = sbspace(&so->so_snd);
422: if (flags & MSG_OOB)
423: space += 1024;
1.21 christos 424: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.11 mycroft 425: clen > so->so_snd.sb_hiwat)
426: snderr(EMSGSIZE);
427: if (space < resid + clen && uio &&
1.1 cgd 428: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
429: if (so->so_state & SS_NBIO)
430: snderr(EWOULDBLOCK);
431: sbunlock(&so->so_snd);
432: error = sbwait(&so->so_snd);
433: splx(s);
434: if (error)
435: goto out;
436: goto restart;
437: }
438: splx(s);
439: mp = ⊤
440: space -= clen;
441: do {
1.45 tv 442: if (uio == NULL) {
443: /*
444: * Data is prepackaged in "top".
445: */
446: resid = 0;
447: if (flags & MSG_EOR)
448: top->m_flags |= M_EOR;
449: } else do {
450: if (top == 0) {
451: MGETHDR(m, M_WAIT, MT_DATA);
452: mlen = MHLEN;
453: m->m_pkthdr.len = 0;
454: m->m_pkthdr.rcvif = (struct ifnet *)0;
455: } else {
456: MGET(m, M_WAIT, MT_DATA);
457: mlen = MLEN;
458: }
459: if (resid >= MINCLSIZE && space >= MCLBYTES) {
460: MCLGET(m, M_WAIT);
461: if ((m->m_flags & M_EXT) == 0)
462: goto nopages;
463: mlen = MCLBYTES;
1.15 mycroft 464: #ifdef MAPPED_MBUFS
1.45 tv 465: len = min(MCLBYTES, resid);
1.15 mycroft 466: #else
1.45 tv 467: if (atomic && top == 0) {
468: len = min(MCLBYTES - max_hdr, resid);
469: m->m_data += max_hdr;
470: } else
471: len = min(MCLBYTES, resid);
1.15 mycroft 472: #endif
1.45 tv 473: space -= len;
474: } else {
1.1 cgd 475: nopages:
1.45 tv 476: len = min(min(mlen, resid), space);
477: space -= len;
478: /*
479: * For datagram protocols, leave room
480: * for protocol headers in first mbuf.
481: */
482: if (atomic && top == 0 && len < mlen)
483: MH_ALIGN(m, len);
484: }
485: error = uiomove(mtod(m, caddr_t), (int)len, uio);
486: resid = uio->uio_resid;
487: m->m_len = len;
488: *mp = m;
489: top->m_pkthdr.len += len;
490: if (error)
491: goto release;
492: mp = &m->m_next;
493: if (resid <= 0) {
494: if (flags & MSG_EOR)
495: top->m_flags |= M_EOR;
496: break;
497: }
498: } while (space > 0 && atomic);
1.46 sommerfe 499:
500: s = splsoftnet();
501:
502: if (so->so_state & SS_CANTSENDMORE)
503: snderr(EPIPE);
1.45 tv 504:
505: if (dontroute)
506: so->so_options |= SO_DONTROUTE;
507: if (resid > 0)
508: so->so_state |= SS_MORETOCOME;
1.46 sommerfe 509: error = (*so->so_proto->pr_usrreq)(so,
510: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
511: top, addr, control, p);
1.45 tv 512: if (dontroute)
513: so->so_options &= ~SO_DONTROUTE;
514: if (resid > 0)
515: so->so_state &= ~SS_MORETOCOME;
1.46 sommerfe 516: splx(s);
517:
1.45 tv 518: clen = 0;
519: control = 0;
520: top = 0;
521: mp = ⊤
1.1 cgd 522: if (error)
523: goto release;
524: } while (resid && space > 0);
525: } while (resid);
526:
527: release:
528: sbunlock(&so->so_snd);
529: out:
530: if (top)
531: m_freem(top);
532: if (control)
533: m_freem(control);
534: return (error);
535: }
536:
537: /*
538: * Implement receive operations on a socket.
539: * We depend on the way that records are added to the sockbuf
540: * by sbappend*. In particular, each record (mbufs linked through m_next)
541: * must begin with an address if the protocol so specifies,
542: * followed by an optional mbuf or mbufs containing ancillary data,
543: * and then zero or more mbufs of data.
544: * In order to avoid blocking network interrupts for the entire time here,
545: * we splx() while doing the actual copy to user space.
546: * Although the sockbuf is locked, new data may still be appended,
547: * and thus we must maintain consistency of the sockbuf during that time.
548: *
549: * The caller may receive the data as a single mbuf chain by supplying
550: * an mbuf **mp0 for use in returning the chain. The uio is then used
551: * only for the count in uio_resid.
552: */
1.3 andrew 553: int
1.1 cgd 554: soreceive(so, paddr, uio, mp0, controlp, flagsp)
555: register struct socket *so;
556: struct mbuf **paddr;
557: struct uio *uio;
558: struct mbuf **mp0;
559: struct mbuf **controlp;
560: int *flagsp;
561: {
562: register struct mbuf *m, **mp;
563: register int flags, len, error, s, offset;
564: struct protosw *pr = so->so_proto;
565: struct mbuf *nextrecord;
1.21 christos 566: int moff, type = 0;
1.3 andrew 567: int orig_resid = uio->uio_resid;
1.1 cgd 568:
569: mp = mp0;
570: if (paddr)
571: *paddr = 0;
572: if (controlp)
573: *controlp = 0;
574: if (flagsp)
575: flags = *flagsp &~ MSG_EOR;
576: else
577: flags = 0;
578: if (flags & MSG_OOB) {
579: m = m_get(M_WAIT, MT_DATA);
1.17 cgd 580: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.22 mycroft 581: (struct mbuf *)(long)(flags & MSG_PEEK), (struct mbuf *)0,
582: (struct proc *)0);
1.1 cgd 583: if (error)
584: goto bad;
585: do {
586: error = uiomove(mtod(m, caddr_t),
587: (int) min(uio->uio_resid, m->m_len), uio);
588: m = m_free(m);
589: } while (uio->uio_resid && error == 0 && m);
590: bad:
591: if (m)
592: m_freem(m);
593: return (error);
594: }
595: if (mp)
596: *mp = (struct mbuf *)0;
597: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.22 mycroft 598: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
599: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 600:
601: restart:
1.21 christos 602: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0)
1.1 cgd 603: return (error);
1.20 mycroft 604: s = splsoftnet();
1.1 cgd 605:
606: m = so->so_rcv.sb_mb;
607: /*
608: * If we have less data than requested, block awaiting more
609: * (subject to any timeout) if:
1.15 mycroft 610: * 1. the current count is less than the low water mark,
1.1 cgd 611: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 612: * receive operation at once if we block (resid <= hiwat), or
613: * 3. MSG_DONTWAIT is not set.
1.1 cgd 614: * If MSG_WAITALL is set but resid is larger than the receive buffer,
615: * we have to do the receive in sections, and thus risk returning
616: * a short count if a timeout or signal occurs after we start.
617: */
1.21 christos 618: if (m == 0 || (((flags & MSG_DONTWAIT) == 0 &&
1.15 mycroft 619: so->so_rcv.sb_cc < uio->uio_resid) &&
1.1 cgd 620: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
621: ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.21 christos 622: m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) {
1.1 cgd 623: #ifdef DIAGNOSTIC
624: if (m == 0 && so->so_rcv.sb_cc)
625: panic("receive 1");
626: #endif
627: if (so->so_error) {
628: if (m)
1.15 mycroft 629: goto dontblock;
1.1 cgd 630: error = so->so_error;
631: if ((flags & MSG_PEEK) == 0)
632: so->so_error = 0;
633: goto release;
634: }
635: if (so->so_state & SS_CANTRCVMORE) {
636: if (m)
1.15 mycroft 637: goto dontblock;
1.1 cgd 638: else
639: goto release;
640: }
641: for (; m; m = m->m_next)
642: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
643: m = so->so_rcv.sb_mb;
644: goto dontblock;
645: }
646: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
647: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
648: error = ENOTCONN;
649: goto release;
650: }
651: if (uio->uio_resid == 0)
652: goto release;
1.15 mycroft 653: if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) {
1.1 cgd 654: error = EWOULDBLOCK;
655: goto release;
656: }
657: sbunlock(&so->so_rcv);
658: error = sbwait(&so->so_rcv);
659: splx(s);
660: if (error)
661: return (error);
662: goto restart;
663: }
664: dontblock:
1.15 mycroft 665: #ifdef notyet /* XXXX */
666: if (uio->uio_procp)
667: uio->uio_procp->p_stats->p_ru.ru_msgrcv++;
668: #endif
1.1 cgd 669: nextrecord = m->m_nextpkt;
670: if (pr->pr_flags & PR_ADDR) {
671: #ifdef DIAGNOSTIC
672: if (m->m_type != MT_SONAME)
673: panic("receive 1a");
674: #endif
1.3 andrew 675: orig_resid = 0;
1.1 cgd 676: if (flags & MSG_PEEK) {
677: if (paddr)
678: *paddr = m_copy(m, 0, m->m_len);
679: m = m->m_next;
680: } else {
681: sbfree(&so->so_rcv, m);
682: if (paddr) {
683: *paddr = m;
684: so->so_rcv.sb_mb = m->m_next;
685: m->m_next = 0;
686: m = so->so_rcv.sb_mb;
687: } else {
688: MFREE(m, so->so_rcv.sb_mb);
689: m = so->so_rcv.sb_mb;
690: }
691: }
692: }
693: while (m && m->m_type == MT_CONTROL && error == 0) {
694: if (flags & MSG_PEEK) {
695: if (controlp)
696: *controlp = m_copy(m, 0, m->m_len);
697: m = m->m_next;
698: } else {
699: sbfree(&so->so_rcv, m);
700: if (controlp) {
701: if (pr->pr_domain->dom_externalize &&
702: mtod(m, struct cmsghdr *)->cmsg_type ==
703: SCM_RIGHTS)
1.45 tv 704: error = (*pr->pr_domain->dom_externalize)(m);
1.1 cgd 705: *controlp = m;
706: so->so_rcv.sb_mb = m->m_next;
707: m->m_next = 0;
708: m = so->so_rcv.sb_mb;
709: } else {
710: MFREE(m, so->so_rcv.sb_mb);
711: m = so->so_rcv.sb_mb;
712: }
713: }
1.3 andrew 714: if (controlp) {
715: orig_resid = 0;
1.1 cgd 716: controlp = &(*controlp)->m_next;
1.3 andrew 717: }
1.1 cgd 718: }
719: if (m) {
720: if ((flags & MSG_PEEK) == 0)
721: m->m_nextpkt = nextrecord;
722: type = m->m_type;
723: if (type == MT_OOBDATA)
724: flags |= MSG_OOB;
725: }
726: moff = 0;
727: offset = 0;
728: while (m && uio->uio_resid > 0 && error == 0) {
729: if (m->m_type == MT_OOBDATA) {
730: if (type != MT_OOBDATA)
731: break;
732: } else if (type == MT_OOBDATA)
733: break;
734: #ifdef DIAGNOSTIC
735: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
736: panic("receive 3");
737: #endif
738: so->so_state &= ~SS_RCVATMARK;
739: len = uio->uio_resid;
740: if (so->so_oobmark && len > so->so_oobmark - offset)
741: len = so->so_oobmark - offset;
742: if (len > m->m_len - moff)
743: len = m->m_len - moff;
744: /*
745: * If mp is set, just pass back the mbufs.
746: * Otherwise copy them out via the uio, then free.
747: * Sockbuf must be consistent here (points to current mbuf,
748: * it points to next record) when we drop priority;
749: * we must note any additions to the sockbuf when we
750: * block interrupts again.
751: */
752: if (mp == 0) {
753: splx(s);
754: error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio);
1.20 mycroft 755: s = splsoftnet();
1.1 cgd 756: } else
757: uio->uio_resid -= len;
758: if (len == m->m_len - moff) {
759: if (m->m_flags & M_EOR)
760: flags |= MSG_EOR;
761: if (flags & MSG_PEEK) {
762: m = m->m_next;
763: moff = 0;
764: } else {
765: nextrecord = m->m_nextpkt;
766: sbfree(&so->so_rcv, m);
767: if (mp) {
768: *mp = m;
769: mp = &m->m_next;
770: so->so_rcv.sb_mb = m = m->m_next;
771: *mp = (struct mbuf *)0;
772: } else {
773: MFREE(m, so->so_rcv.sb_mb);
774: m = so->so_rcv.sb_mb;
775: }
776: if (m)
777: m->m_nextpkt = nextrecord;
778: }
779: } else {
780: if (flags & MSG_PEEK)
781: moff += len;
782: else {
783: if (mp)
784: *mp = m_copym(m, 0, len, M_WAIT);
785: m->m_data += len;
786: m->m_len -= len;
787: so->so_rcv.sb_cc -= len;
788: }
789: }
790: if (so->so_oobmark) {
791: if ((flags & MSG_PEEK) == 0) {
792: so->so_oobmark -= len;
793: if (so->so_oobmark == 0) {
794: so->so_state |= SS_RCVATMARK;
795: break;
796: }
1.7 cgd 797: } else {
1.1 cgd 798: offset += len;
1.7 cgd 799: if (offset == so->so_oobmark)
800: break;
801: }
1.1 cgd 802: }
803: if (flags & MSG_EOR)
804: break;
805: /*
806: * If the MSG_WAITALL flag is set (for non-atomic socket),
807: * we must not quit until "uio->uio_resid == 0" or an error
808: * termination. If a signal/timeout occurs, return
809: * with a short count but without error.
810: * Keep sockbuf locked against other readers.
811: */
812: while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 &&
1.3 andrew 813: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 814: if (so->so_error || so->so_state & SS_CANTRCVMORE)
815: break;
816: error = sbwait(&so->so_rcv);
817: if (error) {
818: sbunlock(&so->so_rcv);
819: splx(s);
820: return (0);
821: }
1.21 christos 822: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 823: nextrecord = m->m_nextpkt;
824: }
825: }
1.3 andrew 826:
827: if (m && pr->pr_flags & PR_ATOMIC) {
828: flags |= MSG_TRUNC;
829: if ((flags & MSG_PEEK) == 0)
830: (void) sbdroprecord(&so->so_rcv);
831: }
1.1 cgd 832: if ((flags & MSG_PEEK) == 0) {
833: if (m == 0)
834: so->so_rcv.sb_mb = nextrecord;
835: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.22 mycroft 836: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
837: (struct mbuf *)(long)flags, (struct mbuf *)0,
838: (struct proc *)0);
1.1 cgd 839: }
1.3 andrew 840: if (orig_resid == uio->uio_resid && orig_resid &&
841: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
842: sbunlock(&so->so_rcv);
843: splx(s);
844: goto restart;
845: }
846:
1.1 cgd 847: if (flagsp)
848: *flagsp |= flags;
849: release:
850: sbunlock(&so->so_rcv);
851: splx(s);
852: return (error);
853: }
854:
1.14 mycroft 855: int
1.1 cgd 856: soshutdown(so, how)
1.34 kleink 857: struct socket *so;
858: int how;
1.1 cgd 859: {
1.34 kleink 860: struct protosw *pr = so->so_proto;
861:
862: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
863: return (EINVAL);
1.1 cgd 864:
1.34 kleink 865: if (how == SHUT_RD || how == SHUT_RDWR)
1.1 cgd 866: sorflush(so);
1.34 kleink 867: if (how == SHUT_WR || how == SHUT_RDWR)
1.22 mycroft 868: return (*pr->pr_usrreq)(so, PRU_SHUTDOWN, (struct mbuf *)0,
869: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 870: return (0);
871: }
872:
1.14 mycroft 873: void
1.1 cgd 874: sorflush(so)
875: register struct socket *so;
876: {
877: register struct sockbuf *sb = &so->so_rcv;
878: register struct protosw *pr = so->so_proto;
879: register int s;
880: struct sockbuf asb;
881:
882: sb->sb_flags |= SB_NOINTR;
1.15 mycroft 883: (void) sblock(sb, M_WAITOK);
1.1 cgd 884: s = splimp();
885: socantrcvmore(so);
886: sbunlock(sb);
887: asb = *sb;
1.38 perry 888: memset((caddr_t)sb, 0, sizeof(*sb));
1.1 cgd 889: splx(s);
890: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
891: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
892: sbrelease(&asb);
893: }
894:
1.14 mycroft 895: int
1.1 cgd 896: sosetopt(so, level, optname, m0)
897: register struct socket *so;
898: int level, optname;
899: struct mbuf *m0;
900: {
901: int error = 0;
902: register struct mbuf *m = m0;
903:
904: if (level != SOL_SOCKET) {
905: if (so->so_proto && so->so_proto->pr_ctloutput)
906: return ((*so->so_proto->pr_ctloutput)
907: (PRCO_SETOPT, so, level, optname, &m0));
908: error = ENOPROTOOPT;
909: } else {
910: switch (optname) {
911:
912: case SO_LINGER:
1.36 perry 913: if (m == NULL || m->m_len != sizeof(struct linger)) {
1.1 cgd 914: error = EINVAL;
915: goto bad;
916: }
917: so->so_linger = mtod(m, struct linger *)->l_linger;
918: /* fall thru... */
919:
920: case SO_DEBUG:
921: case SO_KEEPALIVE:
922: case SO_DONTROUTE:
923: case SO_USELOOPBACK:
924: case SO_BROADCAST:
925: case SO_REUSEADDR:
1.15 mycroft 926: case SO_REUSEPORT:
1.1 cgd 927: case SO_OOBINLINE:
1.26 thorpej 928: case SO_TIMESTAMP:
1.36 perry 929: if (m == NULL || m->m_len < sizeof(int)) {
1.1 cgd 930: error = EINVAL;
931: goto bad;
932: }
933: if (*mtod(m, int *))
934: so->so_options |= optname;
935: else
936: so->so_options &= ~optname;
937: break;
938:
939: case SO_SNDBUF:
940: case SO_RCVBUF:
941: case SO_SNDLOWAT:
942: case SO_RCVLOWAT:
1.28 thorpej 943: {
944: int optval;
945:
1.36 perry 946: if (m == NULL || m->m_len < sizeof(int)) {
1.1 cgd 947: error = EINVAL;
948: goto bad;
949: }
1.28 thorpej 950:
951: /*
952: * Values < 1 make no sense for any of these
953: * options, so disallow them.
954: */
955: optval = *mtod(m, int *);
956: if (optval < 1) {
957: error = EINVAL;
958: goto bad;
959: }
960:
1.1 cgd 961: switch (optname) {
962:
963: case SO_SNDBUF:
964: case SO_RCVBUF:
965: if (sbreserve(optname == SO_SNDBUF ?
966: &so->so_snd : &so->so_rcv,
1.28 thorpej 967: (u_long) optval) == 0) {
1.1 cgd 968: error = ENOBUFS;
969: goto bad;
970: }
971: break;
972:
1.28 thorpej 973: /*
974: * Make sure the low-water is never greater than
975: * the high-water.
976: */
1.1 cgd 977: case SO_SNDLOWAT:
1.28 thorpej 978: so->so_snd.sb_lowat =
979: (optval > so->so_snd.sb_hiwat) ?
980: so->so_snd.sb_hiwat : optval;
1.1 cgd 981: break;
982: case SO_RCVLOWAT:
1.28 thorpej 983: so->so_rcv.sb_lowat =
984: (optval > so->so_rcv.sb_hiwat) ?
985: so->so_rcv.sb_hiwat : optval;
1.1 cgd 986: break;
987: }
988: break;
1.28 thorpej 989: }
1.1 cgd 990:
991: case SO_SNDTIMEO:
992: case SO_RCVTIMEO:
993: {
994: struct timeval *tv;
995: short val;
996:
1.36 perry 997: if (m == NULL || m->m_len < sizeof(*tv)) {
1.1 cgd 998: error = EINVAL;
999: goto bad;
1000: }
1001: tv = mtod(m, struct timeval *);
1.19 cgd 1002: if (tv->tv_sec * hz + tv->tv_usec / tick > SHRT_MAX) {
1.1 cgd 1003: error = EDOM;
1004: goto bad;
1005: }
1006: val = tv->tv_sec * hz + tv->tv_usec / tick;
1007:
1008: switch (optname) {
1009:
1010: case SO_SNDTIMEO:
1011: so->so_snd.sb_timeo = val;
1012: break;
1013: case SO_RCVTIMEO:
1014: so->so_rcv.sb_timeo = val;
1015: break;
1016: }
1017: break;
1018: }
1019:
1020: default:
1021: error = ENOPROTOOPT;
1022: break;
1023: }
1.15 mycroft 1024: if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
1025: (void) ((*so->so_proto->pr_ctloutput)
1026: (PRCO_SETOPT, so, level, optname, &m0));
1027: m = NULL; /* freed by protocol */
1028: }
1.1 cgd 1029: }
1030: bad:
1031: if (m)
1032: (void) m_free(m);
1033: return (error);
1034: }
1035:
1.14 mycroft 1036: int
1.1 cgd 1037: sogetopt(so, level, optname, mp)
1038: register struct socket *so;
1039: int level, optname;
1040: struct mbuf **mp;
1041: {
1042: register struct mbuf *m;
1043:
1044: if (level != SOL_SOCKET) {
1045: if (so->so_proto && so->so_proto->pr_ctloutput) {
1046: return ((*so->so_proto->pr_ctloutput)
1047: (PRCO_GETOPT, so, level, optname, mp));
1048: } else
1049: return (ENOPROTOOPT);
1050: } else {
1051: m = m_get(M_WAIT, MT_SOOPTS);
1.36 perry 1052: m->m_len = sizeof(int);
1.1 cgd 1053:
1054: switch (optname) {
1055:
1056: case SO_LINGER:
1.36 perry 1057: m->m_len = sizeof(struct linger);
1.1 cgd 1058: mtod(m, struct linger *)->l_onoff =
1059: so->so_options & SO_LINGER;
1060: mtod(m, struct linger *)->l_linger = so->so_linger;
1061: break;
1062:
1063: case SO_USELOOPBACK:
1064: case SO_DONTROUTE:
1065: case SO_DEBUG:
1066: case SO_KEEPALIVE:
1067: case SO_REUSEADDR:
1.15 mycroft 1068: case SO_REUSEPORT:
1.1 cgd 1069: case SO_BROADCAST:
1070: case SO_OOBINLINE:
1.26 thorpej 1071: case SO_TIMESTAMP:
1.1 cgd 1072: *mtod(m, int *) = so->so_options & optname;
1073: break;
1074:
1075: case SO_TYPE:
1076: *mtod(m, int *) = so->so_type;
1077: break;
1078:
1079: case SO_ERROR:
1080: *mtod(m, int *) = so->so_error;
1081: so->so_error = 0;
1082: break;
1083:
1084: case SO_SNDBUF:
1085: *mtod(m, int *) = so->so_snd.sb_hiwat;
1086: break;
1087:
1088: case SO_RCVBUF:
1089: *mtod(m, int *) = so->so_rcv.sb_hiwat;
1090: break;
1091:
1092: case SO_SNDLOWAT:
1093: *mtod(m, int *) = so->so_snd.sb_lowat;
1094: break;
1095:
1096: case SO_RCVLOWAT:
1097: *mtod(m, int *) = so->so_rcv.sb_lowat;
1098: break;
1099:
1100: case SO_SNDTIMEO:
1101: case SO_RCVTIMEO:
1102: {
1103: int val = (optname == SO_SNDTIMEO ?
1104: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1105:
1106: m->m_len = sizeof(struct timeval);
1107: mtod(m, struct timeval *)->tv_sec = val / hz;
1108: mtod(m, struct timeval *)->tv_usec =
1.27 kleink 1109: (val % hz) * tick;
1.1 cgd 1110: break;
1111: }
1112:
1113: default:
1114: (void)m_free(m);
1115: return (ENOPROTOOPT);
1116: }
1117: *mp = m;
1118: return (0);
1119: }
1120: }
1121:
1.14 mycroft 1122: void
1.1 cgd 1123: sohasoutofband(so)
1124: register struct socket *so;
1125: {
1126: struct proc *p;
1127:
1128: if (so->so_pgid < 0)
1129: gsignal(-so->so_pgid, SIGURG);
1130: else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0)
1131: psignal(p, SIGURG);
1.2 cgd 1132: selwakeup(&so->so_rcv.sb_sel);
1.1 cgd 1133: }