Annotation of src/sys/kern/uipc_socket.c, Revision 1.25
1.25 ! explorer 1: /* $NetBSD: uipc_socket.c,v 1.24 1996/05/22 19:06:07 mycroft 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));
82: so->so_type = type;
83: so->so_proto = prp;
1.22 mycroft 84: error = (*prp->pr_usrreq)(so, PRU_ATTACH, (struct mbuf *)0,
85: (struct mbuf *)(long)proto, (struct mbuf *)0, p);
1.1 cgd 86: if (error) {
87: so->so_state |= SS_NOFDREF;
88: sofree(so);
89: return (error);
90: }
1.10 deraadt 91: #ifdef COMPAT_SUNOS
1.18 christos 92: {
93: extern struct emul emul_sunos;
94: if (p->p_emul == &emul_sunos && type == SOCK_DGRAM)
95: so->so_options |= SO_BROADCAST;
96: }
1.10 deraadt 97: #endif
1.1 cgd 98: *aso = so;
99: return (0);
100: }
101:
1.3 andrew 102: int
1.1 cgd 103: sobind(so, nam)
104: struct socket *so;
105: struct mbuf *nam;
106: {
1.22 mycroft 107: struct proc *p = curproc; /* XXX */
1.20 mycroft 108: int s = splsoftnet();
1.1 cgd 109: int error;
110:
1.22 mycroft 111: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, (struct mbuf *)0,
112: nam, (struct mbuf *)0, p);
1.1 cgd 113: splx(s);
114: return (error);
115: }
116:
1.3 andrew 117: int
1.1 cgd 118: solisten(so, backlog)
119: register struct socket *so;
120: int backlog;
121: {
1.20 mycroft 122: int s = splsoftnet(), error;
1.1 cgd 123:
1.22 mycroft 124: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, (struct mbuf *)0,
125: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 126: if (error) {
127: splx(s);
128: return (error);
129: }
130: if (so->so_q == 0)
131: so->so_options |= SO_ACCEPTCONN;
132: if (backlog < 0)
133: backlog = 0;
134: so->so_qlimit = min(backlog, SOMAXCONN);
135: splx(s);
136: return (0);
137: }
138:
1.21 christos 139: void
1.1 cgd 140: sofree(so)
141: register struct socket *so;
142: {
143:
144: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
145: return;
146: if (so->so_head) {
147: if (!soqremque(so, 0) && !soqremque(so, 1))
148: panic("sofree dq");
149: so->so_head = 0;
150: }
151: sbrelease(&so->so_snd);
152: sorflush(so);
153: FREE(so, M_SOCKET);
154: }
155:
156: /*
157: * Close a socket on last file table reference removal.
158: * Initiate disconnect if connected.
159: * Free socket when disconnect complete.
160: */
1.3 andrew 161: int
1.1 cgd 162: soclose(so)
163: register struct socket *so;
164: {
1.20 mycroft 165: int s = splsoftnet(); /* conservative */
1.1 cgd 166: int error = 0;
167:
168: if (so->so_options & SO_ACCEPTCONN) {
169: while (so->so_q0)
170: (void) soabort(so->so_q0);
171: while (so->so_q)
172: (void) soabort(so->so_q);
173: }
174: if (so->so_pcb == 0)
175: goto discard;
176: if (so->so_state & SS_ISCONNECTED) {
177: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
178: error = sodisconnect(so);
179: if (error)
180: goto drop;
181: }
182: if (so->so_options & SO_LINGER) {
183: if ((so->so_state & SS_ISDISCONNECTING) &&
184: (so->so_state & SS_NBIO))
185: goto drop;
1.21 christos 186: while (so->so_state & SS_ISCONNECTED) {
187: error = tsleep((caddr_t)&so->so_timeo,
188: PSOCK | PCATCH, netcls,
189: so->so_linger);
190: if (error)
1.1 cgd 191: break;
1.21 christos 192: }
1.1 cgd 193: }
194: }
195: drop:
196: if (so->so_pcb) {
1.22 mycroft 197: int error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
198: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0,
199: (struct proc *)0);
1.1 cgd 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: /*
1.20 mycroft 213: * Must be called at splsoftnet...
1.1 cgd 214: */
1.3 andrew 215: int
1.1 cgd 216: soabort(so)
217: struct socket *so;
218: {
219:
1.22 mycroft 220: return (*so->so_proto->pr_usrreq)(so, PRU_ABORT, (struct mbuf *)0,
221: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 222: }
223:
1.3 andrew 224: int
1.1 cgd 225: soaccept(so, nam)
226: register struct socket *so;
227: struct mbuf *nam;
228: {
1.20 mycroft 229: int s = splsoftnet();
1.1 cgd 230: int error;
231:
232: if ((so->so_state & SS_NOFDREF) == 0)
233: panic("soaccept: !NOFDREF");
234: so->so_state &= ~SS_NOFDREF;
1.22 mycroft 235: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, (struct mbuf *)0,
236: nam, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 237: splx(s);
238: return (error);
239: }
240:
1.3 andrew 241: int
1.1 cgd 242: soconnect(so, nam)
243: register struct socket *so;
244: struct mbuf *nam;
245: {
1.23 mycroft 246: struct proc *p = curproc; /* XXX */
1.1 cgd 247: int s;
248: int error;
249:
250: if (so->so_options & SO_ACCEPTCONN)
251: return (EOPNOTSUPP);
1.20 mycroft 252: s = splsoftnet();
1.1 cgd 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,
1.23 mycroft 265: (struct mbuf *)0, nam, (struct mbuf *)0, p);
1.1 cgd 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: {
1.20 mycroft 275: int s = splsoftnet();
1.1 cgd 276: int error;
277:
1.22 mycroft 278: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
279: (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0,
280: (struct proc *)0);
1.1 cgd 281: splx(s);
282: return (error);
283: }
284:
1.3 andrew 285: int
1.1 cgd 286: sodisconnect(so)
287: register struct socket *so;
288: {
1.20 mycroft 289: int s = splsoftnet();
1.1 cgd 290: int error;
291:
292: if ((so->so_state & SS_ISCONNECTED) == 0) {
293: error = ENOTCONN;
294: goto bad;
295: }
296: if (so->so_state & SS_ISDISCONNECTING) {
297: error = EALREADY;
298: goto bad;
299: }
1.22 mycroft 300: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
301: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0,
302: (struct proc *)0);
1.1 cgd 303: bad:
304: splx(s);
305: return (error);
306: }
307:
1.15 mycroft 308: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 309: /*
310: * Send on a socket.
311: * If send must go all at once and message is larger than
312: * send buffering, then hard error.
313: * Lock against other senders.
314: * If must go all at once and not enough room now, then
315: * inform user that this would block and do nothing.
316: * Otherwise, if nonblocking, send as much as possible.
317: * The data to be sent is described by "uio" if nonzero,
318: * otherwise by the mbuf chain "top" (which must be null
319: * if uio is not). Data provided in mbuf chain must be small
320: * enough to send all at once.
321: *
322: * Returns nonzero on error, timeout or signal; callers
323: * must check for short counts if EINTR/ERESTART are returned.
324: * Data and control buffers are freed on return.
325: */
1.3 andrew 326: int
1.1 cgd 327: sosend(so, addr, uio, top, control, flags)
328: register struct socket *so;
329: struct mbuf *addr;
330: struct uio *uio;
331: struct mbuf *top;
332: struct mbuf *control;
333: int flags;
334: {
1.15 mycroft 335: struct proc *p = curproc; /* XXX */
1.1 cgd 336: struct mbuf **mp;
337: register struct mbuf *m;
338: register long space, len, resid;
339: int clen = 0, error, s, dontroute, mlen;
340: int atomic = sosendallatonce(so) || top;
341:
342: if (uio)
343: resid = uio->uio_resid;
344: else
345: resid = top->m_pkthdr.len;
1.7 cgd 346: /*
347: * In theory resid should be unsigned.
348: * However, space must be signed, as it might be less than 0
349: * if we over-committed, and we must use a signed comparison
350: * of space and resid. On the other hand, a negative resid
351: * causes us to loop sending 0-length segments to the protocol.
352: */
353: if (resid < 0)
354: return (EINVAL);
1.1 cgd 355: dontroute =
356: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
357: (so->so_proto->pr_flags & PR_ATOMIC);
1.12 mycroft 358: p->p_stats->p_ru.ru_msgsnd++;
1.1 cgd 359: if (control)
360: clen = control->m_len;
361: #define snderr(errno) { error = errno; splx(s); goto release; }
362:
363: restart:
1.21 christos 364: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 365: goto out;
366: do {
1.20 mycroft 367: s = splsoftnet();
1.1 cgd 368: if (so->so_state & SS_CANTSENDMORE)
369: snderr(EPIPE);
370: if (so->so_error)
371: snderr(so->so_error);
372: if ((so->so_state & SS_ISCONNECTED) == 0) {
373: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
374: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
375: !(resid == 0 && clen != 0))
376: snderr(ENOTCONN);
377: } else if (addr == 0)
378: snderr(EDESTADDRREQ);
379: }
380: space = sbspace(&so->so_snd);
381: if (flags & MSG_OOB)
382: space += 1024;
1.21 christos 383: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.11 mycroft 384: clen > so->so_snd.sb_hiwat)
385: snderr(EMSGSIZE);
386: if (space < resid + clen && uio &&
1.1 cgd 387: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
388: if (so->so_state & SS_NBIO)
389: snderr(EWOULDBLOCK);
390: sbunlock(&so->so_snd);
391: error = sbwait(&so->so_snd);
392: splx(s);
393: if (error)
394: goto out;
395: goto restart;
396: }
397: splx(s);
398: mp = ⊤
399: space -= clen;
400: do {
401: if (uio == NULL) {
402: /*
403: * Data is prepackaged in "top".
404: */
405: resid = 0;
406: if (flags & MSG_EOR)
407: top->m_flags |= M_EOR;
408: } else do {
409: if (top == 0) {
410: MGETHDR(m, M_WAIT, MT_DATA);
411: mlen = MHLEN;
412: m->m_pkthdr.len = 0;
413: m->m_pkthdr.rcvif = (struct ifnet *)0;
414: } else {
415: MGET(m, M_WAIT, MT_DATA);
416: mlen = MLEN;
417: }
1.15 mycroft 418: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.1 cgd 419: MCLGET(m, M_WAIT);
420: if ((m->m_flags & M_EXT) == 0)
421: goto nopages;
422: mlen = MCLBYTES;
1.15 mycroft 423: #ifdef MAPPED_MBUFS
424: len = min(MCLBYTES, resid);
425: #else
426: if (atomic && top == 0) {
427: len = min(MCLBYTES - max_hdr, resid);
428: m->m_data += max_hdr;
429: } else
430: len = min(MCLBYTES, resid);
431: #endif
1.25 ! explorer 432: space -= len;
1.1 cgd 433: } else {
434: nopages:
435: len = min(min(mlen, resid), space);
1.15 mycroft 436: space -= len;
1.1 cgd 437: /*
438: * For datagram protocols, leave room
439: * for protocol headers in first mbuf.
440: */
441: if (atomic && top == 0 && len < mlen)
442: MH_ALIGN(m, len);
443: }
444: error = uiomove(mtod(m, caddr_t), (int)len, uio);
445: resid = uio->uio_resid;
446: m->m_len = len;
447: *mp = m;
448: top->m_pkthdr.len += len;
449: if (error)
450: goto release;
451: mp = &m->m_next;
452: if (resid <= 0) {
453: if (flags & MSG_EOR)
454: top->m_flags |= M_EOR;
455: break;
456: }
457: } while (space > 0 && atomic);
458: if (dontroute)
459: so->so_options |= SO_DONTROUTE;
1.20 mycroft 460: s = splsoftnet(); /* XXX */
1.22 mycroft 461: error = (*so->so_proto->pr_usrreq)(so,
1.24 mycroft 462: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
463: top, addr, control, p);
1.1 cgd 464: splx(s);
465: if (dontroute)
466: so->so_options &= ~SO_DONTROUTE;
467: clen = 0;
468: control = 0;
469: top = 0;
470: mp = ⊤
471: if (error)
472: goto release;
473: } while (resid && space > 0);
474: } while (resid);
475:
476: release:
477: sbunlock(&so->so_snd);
478: out:
479: if (top)
480: m_freem(top);
481: if (control)
482: m_freem(control);
483: return (error);
484: }
485:
486: /*
487: * Implement receive operations on a socket.
488: * We depend on the way that records are added to the sockbuf
489: * by sbappend*. In particular, each record (mbufs linked through m_next)
490: * must begin with an address if the protocol so specifies,
491: * followed by an optional mbuf or mbufs containing ancillary data,
492: * and then zero or more mbufs of data.
493: * In order to avoid blocking network interrupts for the entire time here,
494: * we splx() while doing the actual copy to user space.
495: * Although the sockbuf is locked, new data may still be appended,
496: * and thus we must maintain consistency of the sockbuf during that time.
497: *
498: * The caller may receive the data as a single mbuf chain by supplying
499: * an mbuf **mp0 for use in returning the chain. The uio is then used
500: * only for the count in uio_resid.
501: */
1.3 andrew 502: int
1.1 cgd 503: soreceive(so, paddr, uio, mp0, controlp, flagsp)
504: register struct socket *so;
505: struct mbuf **paddr;
506: struct uio *uio;
507: struct mbuf **mp0;
508: struct mbuf **controlp;
509: int *flagsp;
510: {
511: register struct mbuf *m, **mp;
512: register int flags, len, error, s, offset;
513: struct protosw *pr = so->so_proto;
514: struct mbuf *nextrecord;
1.21 christos 515: int moff, type = 0;
1.3 andrew 516: int orig_resid = uio->uio_resid;
1.1 cgd 517:
518: mp = mp0;
519: if (paddr)
520: *paddr = 0;
521: if (controlp)
522: *controlp = 0;
523: if (flagsp)
524: flags = *flagsp &~ MSG_EOR;
525: else
526: flags = 0;
527: if (flags & MSG_OOB) {
528: m = m_get(M_WAIT, MT_DATA);
1.17 cgd 529: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.22 mycroft 530: (struct mbuf *)(long)(flags & MSG_PEEK), (struct mbuf *)0,
531: (struct proc *)0);
1.1 cgd 532: if (error)
533: goto bad;
534: do {
535: error = uiomove(mtod(m, caddr_t),
536: (int) min(uio->uio_resid, m->m_len), uio);
537: m = m_free(m);
538: } while (uio->uio_resid && error == 0 && m);
539: bad:
540: if (m)
541: m_freem(m);
542: return (error);
543: }
544: if (mp)
545: *mp = (struct mbuf *)0;
546: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.22 mycroft 547: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
548: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 549:
550: restart:
1.21 christos 551: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0)
1.1 cgd 552: return (error);
1.20 mycroft 553: s = splsoftnet();
1.1 cgd 554:
555: m = so->so_rcv.sb_mb;
556: /*
557: * If we have less data than requested, block awaiting more
558: * (subject to any timeout) if:
1.15 mycroft 559: * 1. the current count is less than the low water mark,
1.1 cgd 560: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 561: * receive operation at once if we block (resid <= hiwat), or
562: * 3. MSG_DONTWAIT is not set.
1.1 cgd 563: * If MSG_WAITALL is set but resid is larger than the receive buffer,
564: * we have to do the receive in sections, and thus risk returning
565: * a short count if a timeout or signal occurs after we start.
566: */
1.21 christos 567: if (m == 0 || (((flags & MSG_DONTWAIT) == 0 &&
1.15 mycroft 568: so->so_rcv.sb_cc < uio->uio_resid) &&
1.1 cgd 569: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
570: ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.21 christos 571: m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) {
1.1 cgd 572: #ifdef DIAGNOSTIC
573: if (m == 0 && so->so_rcv.sb_cc)
574: panic("receive 1");
575: #endif
576: if (so->so_error) {
577: if (m)
1.15 mycroft 578: goto dontblock;
1.1 cgd 579: error = so->so_error;
580: if ((flags & MSG_PEEK) == 0)
581: so->so_error = 0;
582: goto release;
583: }
584: if (so->so_state & SS_CANTRCVMORE) {
585: if (m)
1.15 mycroft 586: goto dontblock;
1.1 cgd 587: else
588: goto release;
589: }
590: for (; m; m = m->m_next)
591: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
592: m = so->so_rcv.sb_mb;
593: goto dontblock;
594: }
595: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
596: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
597: error = ENOTCONN;
598: goto release;
599: }
600: if (uio->uio_resid == 0)
601: goto release;
1.15 mycroft 602: if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) {
1.1 cgd 603: error = EWOULDBLOCK;
604: goto release;
605: }
606: sbunlock(&so->so_rcv);
607: error = sbwait(&so->so_rcv);
608: splx(s);
609: if (error)
610: return (error);
611: goto restart;
612: }
613: dontblock:
1.15 mycroft 614: #ifdef notyet /* XXXX */
615: if (uio->uio_procp)
616: uio->uio_procp->p_stats->p_ru.ru_msgrcv++;
617: #endif
1.1 cgd 618: nextrecord = m->m_nextpkt;
619: if (pr->pr_flags & PR_ADDR) {
620: #ifdef DIAGNOSTIC
621: if (m->m_type != MT_SONAME)
622: panic("receive 1a");
623: #endif
1.3 andrew 624: orig_resid = 0;
1.1 cgd 625: if (flags & MSG_PEEK) {
626: if (paddr)
627: *paddr = m_copy(m, 0, m->m_len);
628: m = m->m_next;
629: } else {
630: sbfree(&so->so_rcv, m);
631: if (paddr) {
632: *paddr = m;
633: so->so_rcv.sb_mb = m->m_next;
634: m->m_next = 0;
635: m = so->so_rcv.sb_mb;
636: } else {
637: MFREE(m, so->so_rcv.sb_mb);
638: m = so->so_rcv.sb_mb;
639: }
640: }
641: }
642: while (m && m->m_type == MT_CONTROL && error == 0) {
643: if (flags & MSG_PEEK) {
644: if (controlp)
645: *controlp = m_copy(m, 0, m->m_len);
646: m = m->m_next;
647: } else {
648: sbfree(&so->so_rcv, m);
649: if (controlp) {
650: if (pr->pr_domain->dom_externalize &&
651: mtod(m, struct cmsghdr *)->cmsg_type ==
652: SCM_RIGHTS)
653: error = (*pr->pr_domain->dom_externalize)(m);
654: *controlp = m;
655: so->so_rcv.sb_mb = m->m_next;
656: m->m_next = 0;
657: m = so->so_rcv.sb_mb;
658: } else {
659: MFREE(m, so->so_rcv.sb_mb);
660: m = so->so_rcv.sb_mb;
661: }
662: }
1.3 andrew 663: if (controlp) {
664: orig_resid = 0;
1.1 cgd 665: controlp = &(*controlp)->m_next;
1.3 andrew 666: }
1.1 cgd 667: }
668: if (m) {
669: if ((flags & MSG_PEEK) == 0)
670: m->m_nextpkt = nextrecord;
671: type = m->m_type;
672: if (type == MT_OOBDATA)
673: flags |= MSG_OOB;
674: }
675: moff = 0;
676: offset = 0;
677: while (m && uio->uio_resid > 0 && error == 0) {
678: if (m->m_type == MT_OOBDATA) {
679: if (type != MT_OOBDATA)
680: break;
681: } else if (type == MT_OOBDATA)
682: break;
683: #ifdef DIAGNOSTIC
684: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
685: panic("receive 3");
686: #endif
687: so->so_state &= ~SS_RCVATMARK;
688: len = uio->uio_resid;
689: if (so->so_oobmark && len > so->so_oobmark - offset)
690: len = so->so_oobmark - offset;
691: if (len > m->m_len - moff)
692: len = m->m_len - moff;
693: /*
694: * If mp is set, just pass back the mbufs.
695: * Otherwise copy them out via the uio, then free.
696: * Sockbuf must be consistent here (points to current mbuf,
697: * it points to next record) when we drop priority;
698: * we must note any additions to the sockbuf when we
699: * block interrupts again.
700: */
701: if (mp == 0) {
702: splx(s);
703: error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio);
1.20 mycroft 704: s = splsoftnet();
1.1 cgd 705: } else
706: uio->uio_resid -= len;
707: if (len == m->m_len - moff) {
708: if (m->m_flags & M_EOR)
709: flags |= MSG_EOR;
710: if (flags & MSG_PEEK) {
711: m = m->m_next;
712: moff = 0;
713: } else {
714: nextrecord = m->m_nextpkt;
715: sbfree(&so->so_rcv, m);
716: if (mp) {
717: *mp = m;
718: mp = &m->m_next;
719: so->so_rcv.sb_mb = m = m->m_next;
720: *mp = (struct mbuf *)0;
721: } else {
722: MFREE(m, so->so_rcv.sb_mb);
723: m = so->so_rcv.sb_mb;
724: }
725: if (m)
726: m->m_nextpkt = nextrecord;
727: }
728: } else {
729: if (flags & MSG_PEEK)
730: moff += len;
731: else {
732: if (mp)
733: *mp = m_copym(m, 0, len, M_WAIT);
734: m->m_data += len;
735: m->m_len -= len;
736: so->so_rcv.sb_cc -= len;
737: }
738: }
739: if (so->so_oobmark) {
740: if ((flags & MSG_PEEK) == 0) {
741: so->so_oobmark -= len;
742: if (so->so_oobmark == 0) {
743: so->so_state |= SS_RCVATMARK;
744: break;
745: }
1.7 cgd 746: } else {
1.1 cgd 747: offset += len;
1.7 cgd 748: if (offset == so->so_oobmark)
749: break;
750: }
1.1 cgd 751: }
752: if (flags & MSG_EOR)
753: break;
754: /*
755: * If the MSG_WAITALL flag is set (for non-atomic socket),
756: * we must not quit until "uio->uio_resid == 0" or an error
757: * termination. If a signal/timeout occurs, return
758: * with a short count but without error.
759: * Keep sockbuf locked against other readers.
760: */
761: while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 &&
1.3 andrew 762: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 763: if (so->so_error || so->so_state & SS_CANTRCVMORE)
764: break;
765: error = sbwait(&so->so_rcv);
766: if (error) {
767: sbunlock(&so->so_rcv);
768: splx(s);
769: return (0);
770: }
1.21 christos 771: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 772: nextrecord = m->m_nextpkt;
773: }
774: }
1.3 andrew 775:
776: if (m && pr->pr_flags & PR_ATOMIC) {
777: flags |= MSG_TRUNC;
778: if ((flags & MSG_PEEK) == 0)
779: (void) sbdroprecord(&so->so_rcv);
780: }
1.1 cgd 781: if ((flags & MSG_PEEK) == 0) {
782: if (m == 0)
783: so->so_rcv.sb_mb = nextrecord;
784: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.22 mycroft 785: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
786: (struct mbuf *)(long)flags, (struct mbuf *)0,
787: (struct proc *)0);
1.1 cgd 788: }
1.3 andrew 789: if (orig_resid == uio->uio_resid && orig_resid &&
790: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
791: sbunlock(&so->so_rcv);
792: splx(s);
793: goto restart;
794: }
795:
1.1 cgd 796: if (flagsp)
797: *flagsp |= flags;
798: release:
799: sbunlock(&so->so_rcv);
800: splx(s);
801: return (error);
802: }
803:
1.14 mycroft 804: int
1.1 cgd 805: soshutdown(so, how)
806: register struct socket *so;
807: register int how;
808: {
809: register struct protosw *pr = so->so_proto;
810:
811: how++;
812: if (how & FREAD)
813: sorflush(so);
814: if (how & FWRITE)
1.22 mycroft 815: return (*pr->pr_usrreq)(so, PRU_SHUTDOWN, (struct mbuf *)0,
816: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 817: return (0);
818: }
819:
1.14 mycroft 820: void
1.1 cgd 821: sorflush(so)
822: register struct socket *so;
823: {
824: register struct sockbuf *sb = &so->so_rcv;
825: register struct protosw *pr = so->so_proto;
826: register int s;
827: struct sockbuf asb;
828:
829: sb->sb_flags |= SB_NOINTR;
1.15 mycroft 830: (void) sblock(sb, M_WAITOK);
1.1 cgd 831: s = splimp();
832: socantrcvmore(so);
833: sbunlock(sb);
834: asb = *sb;
835: bzero((caddr_t)sb, sizeof (*sb));
836: splx(s);
837: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
838: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
839: sbrelease(&asb);
840: }
841:
1.14 mycroft 842: int
1.1 cgd 843: sosetopt(so, level, optname, m0)
844: register struct socket *so;
845: int level, optname;
846: struct mbuf *m0;
847: {
848: int error = 0;
849: register struct mbuf *m = m0;
850:
851: if (level != SOL_SOCKET) {
852: if (so->so_proto && so->so_proto->pr_ctloutput)
853: return ((*so->so_proto->pr_ctloutput)
854: (PRCO_SETOPT, so, level, optname, &m0));
855: error = ENOPROTOOPT;
856: } else {
857: switch (optname) {
858:
859: case SO_LINGER:
860: if (m == NULL || m->m_len != sizeof (struct linger)) {
861: error = EINVAL;
862: goto bad;
863: }
864: so->so_linger = mtod(m, struct linger *)->l_linger;
865: /* fall thru... */
866:
867: case SO_DEBUG:
868: case SO_KEEPALIVE:
869: case SO_DONTROUTE:
870: case SO_USELOOPBACK:
871: case SO_BROADCAST:
872: case SO_REUSEADDR:
1.15 mycroft 873: case SO_REUSEPORT:
1.1 cgd 874: case SO_OOBINLINE:
875: if (m == NULL || m->m_len < sizeof (int)) {
876: error = EINVAL;
877: goto bad;
878: }
879: if (*mtod(m, int *))
880: so->so_options |= optname;
881: else
882: so->so_options &= ~optname;
883: break;
884:
885: case SO_SNDBUF:
886: case SO_RCVBUF:
887: case SO_SNDLOWAT:
888: case SO_RCVLOWAT:
889: if (m == NULL || m->m_len < sizeof (int)) {
890: error = EINVAL;
891: goto bad;
892: }
893: switch (optname) {
894:
895: case SO_SNDBUF:
896: case SO_RCVBUF:
897: if (sbreserve(optname == SO_SNDBUF ?
898: &so->so_snd : &so->so_rcv,
899: (u_long) *mtod(m, int *)) == 0) {
900: error = ENOBUFS;
901: goto bad;
902: }
903: break;
904:
905: case SO_SNDLOWAT:
906: so->so_snd.sb_lowat = *mtod(m, int *);
907: break;
908: case SO_RCVLOWAT:
909: so->so_rcv.sb_lowat = *mtod(m, int *);
910: break;
911: }
912: break;
913:
914: case SO_SNDTIMEO:
915: case SO_RCVTIMEO:
916: {
917: struct timeval *tv;
918: short val;
919:
920: if (m == NULL || m->m_len < sizeof (*tv)) {
921: error = EINVAL;
922: goto bad;
923: }
924: tv = mtod(m, struct timeval *);
1.19 cgd 925: if (tv->tv_sec * hz + tv->tv_usec / tick > SHRT_MAX) {
1.1 cgd 926: error = EDOM;
927: goto bad;
928: }
929: val = tv->tv_sec * hz + tv->tv_usec / tick;
930:
931: switch (optname) {
932:
933: case SO_SNDTIMEO:
934: so->so_snd.sb_timeo = val;
935: break;
936: case SO_RCVTIMEO:
937: so->so_rcv.sb_timeo = val;
938: break;
939: }
940: break;
941: }
942:
943: default:
944: error = ENOPROTOOPT;
945: break;
946: }
1.15 mycroft 947: if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
948: (void) ((*so->so_proto->pr_ctloutput)
949: (PRCO_SETOPT, so, level, optname, &m0));
950: m = NULL; /* freed by protocol */
951: }
1.1 cgd 952: }
953: bad:
954: if (m)
955: (void) m_free(m);
956: return (error);
957: }
958:
1.14 mycroft 959: int
1.1 cgd 960: sogetopt(so, level, optname, mp)
961: register struct socket *so;
962: int level, optname;
963: struct mbuf **mp;
964: {
965: register struct mbuf *m;
966:
967: if (level != SOL_SOCKET) {
968: if (so->so_proto && so->so_proto->pr_ctloutput) {
969: return ((*so->so_proto->pr_ctloutput)
970: (PRCO_GETOPT, so, level, optname, mp));
971: } else
972: return (ENOPROTOOPT);
973: } else {
974: m = m_get(M_WAIT, MT_SOOPTS);
975: m->m_len = sizeof (int);
976:
977: switch (optname) {
978:
979: case SO_LINGER:
980: m->m_len = sizeof (struct linger);
981: mtod(m, struct linger *)->l_onoff =
982: so->so_options & SO_LINGER;
983: mtod(m, struct linger *)->l_linger = so->so_linger;
984: break;
985:
986: case SO_USELOOPBACK:
987: case SO_DONTROUTE:
988: case SO_DEBUG:
989: case SO_KEEPALIVE:
990: case SO_REUSEADDR:
1.15 mycroft 991: case SO_REUSEPORT:
1.1 cgd 992: case SO_BROADCAST:
993: case SO_OOBINLINE:
994: *mtod(m, int *) = so->so_options & optname;
995: break;
996:
997: case SO_TYPE:
998: *mtod(m, int *) = so->so_type;
999: break;
1000:
1001: case SO_ERROR:
1002: *mtod(m, int *) = so->so_error;
1003: so->so_error = 0;
1004: break;
1005:
1006: case SO_SNDBUF:
1007: *mtod(m, int *) = so->so_snd.sb_hiwat;
1008: break;
1009:
1010: case SO_RCVBUF:
1011: *mtod(m, int *) = so->so_rcv.sb_hiwat;
1012: break;
1013:
1014: case SO_SNDLOWAT:
1015: *mtod(m, int *) = so->so_snd.sb_lowat;
1016: break;
1017:
1018: case SO_RCVLOWAT:
1019: *mtod(m, int *) = so->so_rcv.sb_lowat;
1020: break;
1021:
1022: case SO_SNDTIMEO:
1023: case SO_RCVTIMEO:
1024: {
1025: int val = (optname == SO_SNDTIMEO ?
1026: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1027:
1028: m->m_len = sizeof(struct timeval);
1029: mtod(m, struct timeval *)->tv_sec = val / hz;
1030: mtod(m, struct timeval *)->tv_usec =
1031: (val % hz) / tick;
1032: break;
1033: }
1034:
1035: default:
1036: (void)m_free(m);
1037: return (ENOPROTOOPT);
1038: }
1039: *mp = m;
1040: return (0);
1041: }
1042: }
1043:
1.14 mycroft 1044: void
1.1 cgd 1045: sohasoutofband(so)
1046: register struct socket *so;
1047: {
1048: struct proc *p;
1049:
1050: if (so->so_pgid < 0)
1051: gsignal(-so->so_pgid, SIGURG);
1052: else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0)
1053: psignal(p, SIGURG);
1.2 cgd 1054: selwakeup(&so->so_rcv.sb_sel);
1.1 cgd 1055: }
CVSweb <webmaster@jp.NetBSD.org>