Annotation of src/sys/kern/uipc_socket.c, Revision 1.54.2.5
1.54.2.5! nathanw 1: /* $NetBSD: uipc_socket.c,v 1.54.2.4 2001/09/21 22:36:27 nathanw 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>
1.54.2.1 nathanw 42: #include <sys/lwp.h>
1.9 mycroft 43: #include <sys/proc.h>
44: #include <sys/file.h>
45: #include <sys/malloc.h>
46: #include <sys/mbuf.h>
47: #include <sys/domain.h>
48: #include <sys/kernel.h>
49: #include <sys/protosw.h>
50: #include <sys/socket.h>
51: #include <sys/socketvar.h>
1.21 christos 52: #include <sys/signalvar.h>
1.9 mycroft 53: #include <sys/resourcevar.h>
1.37 thorpej 54: #include <sys/pool.h>
55:
1.54 lukem 56: struct pool socket_pool;
1.37 thorpej 57:
1.54 lukem 58: extern int somaxconn; /* patchable (XXX sysctl) */
59: int somaxconn = SOMAXCONN;
1.49 jonathan 60:
1.37 thorpej 61: void
1.54 lukem 62: soinit(void)
1.37 thorpej 63: {
64:
65: pool_init(&socket_pool, sizeof(struct socket), 0, 0, 0,
66: "sockpl", 0, NULL, NULL, M_SOCKET);
67: }
1.1 cgd 68:
69: /*
70: * Socket operation routines.
71: * These routines are called by the routines in
72: * sys_socket.c or from a system process, and
73: * implement the semantics of socket operations by
74: * switching out to the protocol specific routines.
75: */
76: /*ARGSUSED*/
1.3 andrew 77: int
1.54 lukem 78: socreate(int dom, struct socket **aso, int type, int proto)
1.1 cgd 79: {
1.54 lukem 80: struct proc *p;
81: struct protosw *prp;
82: struct socket *so;
83: int error, s;
1.1 cgd 84:
1.54.2.1 nathanw 85: p = curproc->l_proc; /* XXX */
1.1 cgd 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
1.54 lukem 126: sobind(struct socket *so, struct mbuf *nam, struct proc *p)
1.1 cgd 127: {
1.54 lukem 128: int s, error;
1.1 cgd 129:
1.54 lukem 130: s = splsoftnet();
1.22 mycroft 131: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, (struct mbuf *)0,
132: nam, (struct mbuf *)0, p);
1.1 cgd 133: splx(s);
134: return (error);
135: }
136:
1.3 andrew 137: int
1.54 lukem 138: solisten(struct socket *so, int backlog)
1.1 cgd 139: {
1.54 lukem 140: int s, error;
1.1 cgd 141:
1.54 lukem 142: s = splsoftnet();
1.22 mycroft 143: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, (struct mbuf *)0,
144: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 145: if (error) {
146: splx(s);
147: return (error);
148: }
1.31 thorpej 149: if (so->so_q.tqh_first == NULL)
1.1 cgd 150: so->so_options |= SO_ACCEPTCONN;
151: if (backlog < 0)
152: backlog = 0;
1.49 jonathan 153: so->so_qlimit = min(backlog, somaxconn);
1.1 cgd 154: splx(s);
155: return (0);
156: }
157:
1.21 christos 158: void
1.54 lukem 159: sofree(struct socket *so)
1.1 cgd 160: {
161:
1.43 mycroft 162: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
1.1 cgd 163: return;
1.43 mycroft 164: if (so->so_head) {
165: /*
166: * We must not decommission a socket that's on the accept(2)
167: * queue. If we do, then accept(2) may hang after select(2)
168: * indicated that the listening socket was ready.
169: */
170: if (!soqremque(so, 0))
171: return;
172: }
1.1 cgd 173: sbrelease(&so->so_snd);
174: sorflush(so);
1.37 thorpej 175: pool_put(&socket_pool, so);
1.1 cgd 176: }
177:
178: /*
179: * Close a socket on last file table reference removal.
180: * Initiate disconnect if connected.
181: * Free socket when disconnect complete.
182: */
1.3 andrew 183: int
1.54 lukem 184: soclose(struct socket *so)
1.1 cgd 185: {
1.54 lukem 186: struct socket *so2;
187: int s, error;
1.1 cgd 188:
1.54 lukem 189: error = 0;
190: s = splsoftnet(); /* conservative */
1.1 cgd 191: if (so->so_options & SO_ACCEPTCONN) {
1.41 mycroft 192: while ((so2 = so->so_q0.tqh_first) != 0) {
1.42 mycroft 193: (void) soqremque(so2, 0);
1.41 mycroft 194: (void) soabort(so2);
195: }
196: while ((so2 = so->so_q.tqh_first) != 0) {
1.42 mycroft 197: (void) soqremque(so2, 1);
1.41 mycroft 198: (void) soabort(so2);
199: }
1.1 cgd 200: }
201: if (so->so_pcb == 0)
202: goto discard;
203: if (so->so_state & SS_ISCONNECTED) {
204: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
205: error = sodisconnect(so);
206: if (error)
207: goto drop;
208: }
209: if (so->so_options & SO_LINGER) {
210: if ((so->so_state & SS_ISDISCONNECTING) &&
211: (so->so_state & SS_NBIO))
212: goto drop;
1.21 christos 213: while (so->so_state & SS_ISCONNECTED) {
214: error = tsleep((caddr_t)&so->so_timeo,
215: PSOCK | PCATCH, netcls,
1.30 thorpej 216: so->so_linger * hz);
1.21 christos 217: if (error)
1.1 cgd 218: break;
1.21 christos 219: }
1.1 cgd 220: }
221: }
1.54 lukem 222: drop:
1.1 cgd 223: if (so->so_pcb) {
1.22 mycroft 224: int error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
225: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0,
226: (struct proc *)0);
1.1 cgd 227: if (error == 0)
228: error = error2;
229: }
1.54 lukem 230: discard:
1.1 cgd 231: if (so->so_state & SS_NOFDREF)
232: panic("soclose: NOFDREF");
233: so->so_state |= SS_NOFDREF;
234: sofree(so);
235: splx(s);
236: return (error);
237: }
238:
239: /*
1.20 mycroft 240: * Must be called at splsoftnet...
1.1 cgd 241: */
1.3 andrew 242: int
1.54 lukem 243: soabort(struct socket *so)
1.1 cgd 244: {
245:
1.22 mycroft 246: return (*so->so_proto->pr_usrreq)(so, PRU_ABORT, (struct mbuf *)0,
247: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 248: }
249:
1.3 andrew 250: int
1.54 lukem 251: soaccept(struct socket *so, struct mbuf *nam)
1.1 cgd 252: {
1.54 lukem 253: int s, error;
1.1 cgd 254:
1.54 lukem 255: error = 0;
256: s = splsoftnet();
1.1 cgd 257: if ((so->so_state & SS_NOFDREF) == 0)
258: panic("soaccept: !NOFDREF");
259: so->so_state &= ~SS_NOFDREF;
1.54.2.2 nathanw 260: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
261: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41 mycroft 262: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
263: (struct mbuf *)0, nam, (struct mbuf *)0, (struct proc *)0);
264: else
1.53 itojun 265: error = ECONNABORTED;
1.52 itojun 266:
1.1 cgd 267: splx(s);
268: return (error);
269: }
270:
1.3 andrew 271: int
1.54 lukem 272: soconnect(struct socket *so, struct mbuf *nam)
1.1 cgd 273: {
1.54 lukem 274: struct proc *p;
275: int s, error;
1.1 cgd 276:
1.54.2.1 nathanw 277: p = curproc->l_proc; /* XXX */
1.1 cgd 278: if (so->so_options & SO_ACCEPTCONN)
279: return (EOPNOTSUPP);
1.20 mycroft 280: s = splsoftnet();
1.1 cgd 281: /*
282: * If protocol is connection-based, can only connect once.
283: * Otherwise, if connected, try to disconnect first.
284: * This allows user to disconnect by connecting to, e.g.,
285: * a null address.
286: */
287: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
288: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
289: (error = sodisconnect(so))))
290: error = EISCONN;
291: else
292: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.23 mycroft 293: (struct mbuf *)0, nam, (struct mbuf *)0, p);
1.1 cgd 294: splx(s);
295: return (error);
296: }
297:
1.3 andrew 298: int
1.54 lukem 299: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 300: {
1.54 lukem 301: int s, error;
1.1 cgd 302:
1.54 lukem 303: s = splsoftnet();
1.22 mycroft 304: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
305: (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0,
306: (struct proc *)0);
1.1 cgd 307: splx(s);
308: return (error);
309: }
310:
1.3 andrew 311: int
1.54 lukem 312: sodisconnect(struct socket *so)
1.1 cgd 313: {
1.54 lukem 314: int s, error;
1.1 cgd 315:
1.54 lukem 316: s = splsoftnet();
1.1 cgd 317: if ((so->so_state & SS_ISCONNECTED) == 0) {
318: error = ENOTCONN;
319: goto bad;
320: }
321: if (so->so_state & SS_ISDISCONNECTING) {
322: error = EALREADY;
323: goto bad;
324: }
1.22 mycroft 325: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
326: (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0,
327: (struct proc *)0);
1.54 lukem 328: bad:
1.1 cgd 329: splx(s);
330: return (error);
331: }
332:
1.15 mycroft 333: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 334: /*
335: * Send on a socket.
336: * If send must go all at once and message is larger than
337: * send buffering, then hard error.
338: * Lock against other senders.
339: * If must go all at once and not enough room now, then
340: * inform user that this would block and do nothing.
341: * Otherwise, if nonblocking, send as much as possible.
342: * The data to be sent is described by "uio" if nonzero,
343: * otherwise by the mbuf chain "top" (which must be null
344: * if uio is not). Data provided in mbuf chain must be small
345: * enough to send all at once.
346: *
347: * Returns nonzero on error, timeout or signal; callers
348: * must check for short counts if EINTR/ERESTART are returned.
349: * Data and control buffers are freed on return.
350: */
1.3 andrew 351: int
1.54 lukem 352: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
353: struct mbuf *control, int flags)
1.1 cgd 354: {
1.54 lukem 355: struct proc *p;
356: struct mbuf **mp, *m;
1.54.2.5! nathanw 357: long space, len, resid, clen, mlen;
! 358: int error, s, dontroute, atomic;
1.54 lukem 359:
1.54.2.1 nathanw 360: p = curproc->l_proc; /* XXX */
1.54 lukem 361: clen = 0;
362: atomic = sosendallatonce(so) || top;
1.1 cgd 363: if (uio)
364: resid = uio->uio_resid;
365: else
366: resid = top->m_pkthdr.len;
1.7 cgd 367: /*
368: * In theory resid should be unsigned.
369: * However, space must be signed, as it might be less than 0
370: * if we over-committed, and we must use a signed comparison
371: * of space and resid. On the other hand, a negative resid
372: * causes us to loop sending 0-length segments to the protocol.
373: */
1.29 mycroft 374: if (resid < 0) {
375: error = EINVAL;
376: goto out;
377: }
1.1 cgd 378: dontroute =
379: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
380: (so->so_proto->pr_flags & PR_ATOMIC);
1.12 mycroft 381: p->p_stats->p_ru.ru_msgsnd++;
1.1 cgd 382: if (control)
383: clen = control->m_len;
384: #define snderr(errno) { error = errno; splx(s); goto release; }
385:
1.54 lukem 386: restart:
1.21 christos 387: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 388: goto out;
389: do {
1.20 mycroft 390: s = splsoftnet();
1.1 cgd 391: if (so->so_state & SS_CANTSENDMORE)
392: snderr(EPIPE);
1.48 thorpej 393: if (so->so_error) {
394: error = so->so_error;
395: so->so_error = 0;
396: splx(s);
397: goto release;
398: }
1.1 cgd 399: if ((so->so_state & SS_ISCONNECTED) == 0) {
400: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
401: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
402: !(resid == 0 && clen != 0))
403: snderr(ENOTCONN);
404: } else if (addr == 0)
405: snderr(EDESTADDRREQ);
406: }
407: space = sbspace(&so->so_snd);
408: if (flags & MSG_OOB)
409: space += 1024;
1.21 christos 410: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.11 mycroft 411: clen > so->so_snd.sb_hiwat)
412: snderr(EMSGSIZE);
413: if (space < resid + clen && uio &&
1.1 cgd 414: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
415: if (so->so_state & SS_NBIO)
416: snderr(EWOULDBLOCK);
417: sbunlock(&so->so_snd);
418: error = sbwait(&so->so_snd);
419: splx(s);
420: if (error)
421: goto out;
422: goto restart;
423: }
424: splx(s);
425: mp = ⊤
426: space -= clen;
427: do {
1.45 tv 428: if (uio == NULL) {
429: /*
430: * Data is prepackaged in "top".
431: */
432: resid = 0;
433: if (flags & MSG_EOR)
434: top->m_flags |= M_EOR;
435: } else do {
436: if (top == 0) {
437: MGETHDR(m, M_WAIT, MT_DATA);
438: mlen = MHLEN;
439: m->m_pkthdr.len = 0;
440: m->m_pkthdr.rcvif = (struct ifnet *)0;
441: } else {
442: MGET(m, M_WAIT, MT_DATA);
443: mlen = MLEN;
444: }
445: if (resid >= MINCLSIZE && space >= MCLBYTES) {
446: MCLGET(m, M_WAIT);
447: if ((m->m_flags & M_EXT) == 0)
448: goto nopages;
449: mlen = MCLBYTES;
1.15 mycroft 450: #ifdef MAPPED_MBUFS
1.54.2.5! nathanw 451: len = lmin(MCLBYTES, resid);
1.15 mycroft 452: #else
1.45 tv 453: if (atomic && top == 0) {
1.54.2.5! nathanw 454: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 455: resid);
1.45 tv 456: m->m_data += max_hdr;
457: } else
1.54.2.5! nathanw 458: len = lmin(MCLBYTES, resid);
1.15 mycroft 459: #endif
1.45 tv 460: space -= len;
461: } else {
1.1 cgd 462: nopages:
1.54.2.5! nathanw 463: len = lmin(lmin(mlen, resid), space);
1.45 tv 464: space -= len;
465: /*
466: * For datagram protocols, leave room
467: * for protocol headers in first mbuf.
468: */
469: if (atomic && top == 0 && len < mlen)
470: MH_ALIGN(m, len);
471: }
1.54 lukem 472: error = uiomove(mtod(m, caddr_t), (int)len,
473: uio);
1.45 tv 474: resid = uio->uio_resid;
475: m->m_len = len;
476: *mp = m;
477: top->m_pkthdr.len += len;
478: if (error)
479: goto release;
480: mp = &m->m_next;
481: if (resid <= 0) {
482: if (flags & MSG_EOR)
483: top->m_flags |= M_EOR;
484: break;
485: }
486: } while (space > 0 && atomic);
1.46 sommerfe 487:
488: s = splsoftnet();
489:
490: if (so->so_state & SS_CANTSENDMORE)
491: snderr(EPIPE);
1.45 tv 492:
493: if (dontroute)
494: so->so_options |= SO_DONTROUTE;
495: if (resid > 0)
496: so->so_state |= SS_MORETOCOME;
1.46 sommerfe 497: error = (*so->so_proto->pr_usrreq)(so,
498: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
499: top, addr, control, p);
1.45 tv 500: if (dontroute)
501: so->so_options &= ~SO_DONTROUTE;
502: if (resid > 0)
503: so->so_state &= ~SS_MORETOCOME;
1.46 sommerfe 504: splx(s);
505:
1.45 tv 506: clen = 0;
507: control = 0;
508: top = 0;
509: mp = ⊤
1.1 cgd 510: if (error)
511: goto release;
512: } while (resid && space > 0);
513: } while (resid);
514:
1.54 lukem 515: release:
1.1 cgd 516: sbunlock(&so->so_snd);
1.54 lukem 517: out:
1.1 cgd 518: if (top)
519: m_freem(top);
520: if (control)
521: m_freem(control);
522: return (error);
523: }
524:
525: /*
526: * Implement receive operations on a socket.
527: * We depend on the way that records are added to the sockbuf
528: * by sbappend*. In particular, each record (mbufs linked through m_next)
529: * must begin with an address if the protocol so specifies,
530: * followed by an optional mbuf or mbufs containing ancillary data,
531: * and then zero or more mbufs of data.
532: * In order to avoid blocking network interrupts for the entire time here,
533: * we splx() while doing the actual copy to user space.
534: * Although the sockbuf is locked, new data may still be appended,
535: * and thus we must maintain consistency of the sockbuf during that time.
536: *
537: * The caller may receive the data as a single mbuf chain by supplying
538: * an mbuf **mp0 for use in returning the chain. The uio is then used
539: * only for the count in uio_resid.
540: */
1.3 andrew 541: int
1.54 lukem 542: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
543: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 544: {
1.54 lukem 545: struct mbuf *m, **mp;
546: int flags, len, error, s, offset, moff, type, orig_resid;
547: struct protosw *pr;
548: struct mbuf *nextrecord;
1.1 cgd 549:
1.54 lukem 550: pr = so->so_proto;
1.1 cgd 551: mp = mp0;
1.54 lukem 552: type = 0;
553: orig_resid = uio->uio_resid;
1.1 cgd 554: if (paddr)
555: *paddr = 0;
556: if (controlp)
557: *controlp = 0;
558: if (flagsp)
559: flags = *flagsp &~ MSG_EOR;
560: else
561: flags = 0;
562: if (flags & MSG_OOB) {
563: m = m_get(M_WAIT, MT_DATA);
1.17 cgd 564: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.22 mycroft 565: (struct mbuf *)(long)(flags & MSG_PEEK), (struct mbuf *)0,
566: (struct proc *)0);
1.1 cgd 567: if (error)
568: goto bad;
569: do {
570: error = uiomove(mtod(m, caddr_t),
571: (int) min(uio->uio_resid, m->m_len), uio);
572: m = m_free(m);
573: } while (uio->uio_resid && error == 0 && m);
1.54 lukem 574: bad:
1.1 cgd 575: if (m)
576: m_freem(m);
577: return (error);
578: }
579: if (mp)
580: *mp = (struct mbuf *)0;
581: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.22 mycroft 582: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
583: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 584:
1.54 lukem 585: restart:
1.21 christos 586: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0)
1.1 cgd 587: return (error);
1.20 mycroft 588: s = splsoftnet();
1.1 cgd 589:
590: m = so->so_rcv.sb_mb;
591: /*
592: * If we have less data than requested, block awaiting more
593: * (subject to any timeout) if:
1.15 mycroft 594: * 1. the current count is less than the low water mark,
1.1 cgd 595: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 596: * receive operation at once if we block (resid <= hiwat), or
597: * 3. MSG_DONTWAIT is not set.
1.1 cgd 598: * If MSG_WAITALL is set but resid is larger than the receive buffer,
599: * we have to do the receive in sections, and thus risk returning
600: * a short count if a timeout or signal occurs after we start.
601: */
1.21 christos 602: if (m == 0 || (((flags & MSG_DONTWAIT) == 0 &&
1.15 mycroft 603: so->so_rcv.sb_cc < uio->uio_resid) &&
1.1 cgd 604: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
605: ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.21 christos 606: m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) {
1.1 cgd 607: #ifdef DIAGNOSTIC
608: if (m == 0 && so->so_rcv.sb_cc)
609: panic("receive 1");
610: #endif
611: if (so->so_error) {
612: if (m)
1.15 mycroft 613: goto dontblock;
1.1 cgd 614: error = so->so_error;
615: if ((flags & MSG_PEEK) == 0)
616: so->so_error = 0;
617: goto release;
618: }
619: if (so->so_state & SS_CANTRCVMORE) {
620: if (m)
1.15 mycroft 621: goto dontblock;
1.1 cgd 622: else
623: goto release;
624: }
625: for (; m; m = m->m_next)
626: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
627: m = so->so_rcv.sb_mb;
628: goto dontblock;
629: }
630: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
631: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
632: error = ENOTCONN;
633: goto release;
634: }
635: if (uio->uio_resid == 0)
636: goto release;
1.15 mycroft 637: if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) {
1.1 cgd 638: error = EWOULDBLOCK;
639: goto release;
640: }
641: sbunlock(&so->so_rcv);
642: error = sbwait(&so->so_rcv);
643: splx(s);
644: if (error)
645: return (error);
646: goto restart;
647: }
1.54 lukem 648: dontblock:
1.15 mycroft 649: #ifdef notyet /* XXXX */
650: if (uio->uio_procp)
651: uio->uio_procp->p_stats->p_ru.ru_msgrcv++;
652: #endif
1.1 cgd 653: nextrecord = m->m_nextpkt;
654: if (pr->pr_flags & PR_ADDR) {
655: #ifdef DIAGNOSTIC
656: if (m->m_type != MT_SONAME)
657: panic("receive 1a");
658: #endif
1.3 andrew 659: orig_resid = 0;
1.1 cgd 660: if (flags & MSG_PEEK) {
661: if (paddr)
662: *paddr = m_copy(m, 0, m->m_len);
663: m = m->m_next;
664: } else {
665: sbfree(&so->so_rcv, m);
666: if (paddr) {
667: *paddr = m;
668: so->so_rcv.sb_mb = m->m_next;
669: m->m_next = 0;
670: m = so->so_rcv.sb_mb;
671: } else {
672: MFREE(m, so->so_rcv.sb_mb);
673: m = so->so_rcv.sb_mb;
674: }
675: }
676: }
677: while (m && m->m_type == MT_CONTROL && error == 0) {
678: if (flags & MSG_PEEK) {
679: if (controlp)
680: *controlp = m_copy(m, 0, m->m_len);
681: m = m->m_next;
682: } else {
683: sbfree(&so->so_rcv, m);
684: if (controlp) {
685: if (pr->pr_domain->dom_externalize &&
686: mtod(m, struct cmsghdr *)->cmsg_type ==
687: SCM_RIGHTS)
1.45 tv 688: error = (*pr->pr_domain->dom_externalize)(m);
1.1 cgd 689: *controlp = m;
690: so->so_rcv.sb_mb = m->m_next;
691: m->m_next = 0;
692: m = so->so_rcv.sb_mb;
693: } else {
694: MFREE(m, so->so_rcv.sb_mb);
695: m = so->so_rcv.sb_mb;
696: }
697: }
1.3 andrew 698: if (controlp) {
699: orig_resid = 0;
1.1 cgd 700: controlp = &(*controlp)->m_next;
1.3 andrew 701: }
1.1 cgd 702: }
703: if (m) {
704: if ((flags & MSG_PEEK) == 0)
705: m->m_nextpkt = nextrecord;
706: type = m->m_type;
707: if (type == MT_OOBDATA)
708: flags |= MSG_OOB;
709: }
710: moff = 0;
711: offset = 0;
712: while (m && uio->uio_resid > 0 && error == 0) {
713: if (m->m_type == MT_OOBDATA) {
714: if (type != MT_OOBDATA)
715: break;
716: } else if (type == MT_OOBDATA)
717: break;
718: #ifdef DIAGNOSTIC
719: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
720: panic("receive 3");
721: #endif
722: so->so_state &= ~SS_RCVATMARK;
723: len = uio->uio_resid;
724: if (so->so_oobmark && len > so->so_oobmark - offset)
725: len = so->so_oobmark - offset;
726: if (len > m->m_len - moff)
727: len = m->m_len - moff;
728: /*
729: * If mp is set, just pass back the mbufs.
730: * Otherwise copy them out via the uio, then free.
731: * Sockbuf must be consistent here (points to current mbuf,
732: * it points to next record) when we drop priority;
733: * we must note any additions to the sockbuf when we
734: * block interrupts again.
735: */
736: if (mp == 0) {
737: splx(s);
738: error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio);
1.20 mycroft 739: s = splsoftnet();
1.54.2.4 nathanw 740: if (error)
741: goto release;
1.1 cgd 742: } else
743: uio->uio_resid -= len;
744: if (len == m->m_len - moff) {
745: if (m->m_flags & M_EOR)
746: flags |= MSG_EOR;
747: if (flags & MSG_PEEK) {
748: m = m->m_next;
749: moff = 0;
750: } else {
751: nextrecord = m->m_nextpkt;
752: sbfree(&so->so_rcv, m);
753: if (mp) {
754: *mp = m;
755: mp = &m->m_next;
756: so->so_rcv.sb_mb = m = m->m_next;
757: *mp = (struct mbuf *)0;
758: } else {
759: MFREE(m, so->so_rcv.sb_mb);
760: m = so->so_rcv.sb_mb;
761: }
762: if (m)
763: m->m_nextpkt = nextrecord;
764: }
765: } else {
766: if (flags & MSG_PEEK)
767: moff += len;
768: else {
769: if (mp)
770: *mp = m_copym(m, 0, len, M_WAIT);
771: m->m_data += len;
772: m->m_len -= len;
773: so->so_rcv.sb_cc -= len;
774: }
775: }
776: if (so->so_oobmark) {
777: if ((flags & MSG_PEEK) == 0) {
778: so->so_oobmark -= len;
779: if (so->so_oobmark == 0) {
780: so->so_state |= SS_RCVATMARK;
781: break;
782: }
1.7 cgd 783: } else {
1.1 cgd 784: offset += len;
1.7 cgd 785: if (offset == so->so_oobmark)
786: break;
787: }
1.1 cgd 788: }
789: if (flags & MSG_EOR)
790: break;
791: /*
792: * If the MSG_WAITALL flag is set (for non-atomic socket),
793: * we must not quit until "uio->uio_resid == 0" or an error
794: * termination. If a signal/timeout occurs, return
795: * with a short count but without error.
796: * Keep sockbuf locked against other readers.
797: */
798: while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 &&
1.3 andrew 799: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 800: if (so->so_error || so->so_state & SS_CANTRCVMORE)
801: break;
802: error = sbwait(&so->so_rcv);
803: if (error) {
804: sbunlock(&so->so_rcv);
805: splx(s);
806: return (0);
807: }
1.21 christos 808: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 809: nextrecord = m->m_nextpkt;
810: }
811: }
1.3 andrew 812:
813: if (m && pr->pr_flags & PR_ATOMIC) {
814: flags |= MSG_TRUNC;
815: if ((flags & MSG_PEEK) == 0)
816: (void) sbdroprecord(&so->so_rcv);
817: }
1.1 cgd 818: if ((flags & MSG_PEEK) == 0) {
819: if (m == 0)
820: so->so_rcv.sb_mb = nextrecord;
821: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.22 mycroft 822: (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
823: (struct mbuf *)(long)flags, (struct mbuf *)0,
824: (struct proc *)0);
1.1 cgd 825: }
1.3 andrew 826: if (orig_resid == uio->uio_resid && orig_resid &&
827: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
828: sbunlock(&so->so_rcv);
829: splx(s);
830: goto restart;
831: }
832:
1.1 cgd 833: if (flagsp)
834: *flagsp |= flags;
1.54 lukem 835: release:
1.1 cgd 836: sbunlock(&so->so_rcv);
837: splx(s);
838: return (error);
839: }
840:
1.14 mycroft 841: int
1.54 lukem 842: soshutdown(struct socket *so, int how)
1.1 cgd 843: {
1.54 lukem 844: struct protosw *pr;
1.34 kleink 845:
1.54 lukem 846: pr = so->so_proto;
1.34 kleink 847: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
848: return (EINVAL);
1.1 cgd 849:
1.34 kleink 850: if (how == SHUT_RD || how == SHUT_RDWR)
1.1 cgd 851: sorflush(so);
1.34 kleink 852: if (how == SHUT_WR || how == SHUT_RDWR)
1.22 mycroft 853: return (*pr->pr_usrreq)(so, PRU_SHUTDOWN, (struct mbuf *)0,
854: (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0);
1.1 cgd 855: return (0);
856: }
857:
1.14 mycroft 858: void
1.54 lukem 859: sorflush(struct socket *so)
1.1 cgd 860: {
1.54 lukem 861: struct sockbuf *sb, asb;
862: struct protosw *pr;
863: int s;
1.1 cgd 864:
1.54 lukem 865: sb = &so->so_rcv;
866: pr = so->so_proto;
1.1 cgd 867: sb->sb_flags |= SB_NOINTR;
1.15 mycroft 868: (void) sblock(sb, M_WAITOK);
1.54.2.3 nathanw 869: s = splnet();
1.1 cgd 870: socantrcvmore(so);
871: sbunlock(sb);
872: asb = *sb;
1.38 perry 873: memset((caddr_t)sb, 0, sizeof(*sb));
1.1 cgd 874: splx(s);
875: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
876: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
877: sbrelease(&asb);
878: }
879:
1.14 mycroft 880: int
1.54 lukem 881: sosetopt(struct socket *so, int level, int optname, struct mbuf *m0)
1.1 cgd 882: {
1.54 lukem 883: int error;
884: struct mbuf *m;
1.1 cgd 885:
1.54 lukem 886: error = 0;
887: m = m0;
1.1 cgd 888: if (level != SOL_SOCKET) {
889: if (so->so_proto && so->so_proto->pr_ctloutput)
890: return ((*so->so_proto->pr_ctloutput)
891: (PRCO_SETOPT, so, level, optname, &m0));
892: error = ENOPROTOOPT;
893: } else {
894: switch (optname) {
895:
896: case SO_LINGER:
1.36 perry 897: if (m == NULL || m->m_len != sizeof(struct linger)) {
1.1 cgd 898: error = EINVAL;
899: goto bad;
900: }
901: so->so_linger = mtod(m, struct linger *)->l_linger;
902: /* fall thru... */
903:
904: case SO_DEBUG:
905: case SO_KEEPALIVE:
906: case SO_DONTROUTE:
907: case SO_USELOOPBACK:
908: case SO_BROADCAST:
909: case SO_REUSEADDR:
1.15 mycroft 910: case SO_REUSEPORT:
1.1 cgd 911: case SO_OOBINLINE:
1.26 thorpej 912: case SO_TIMESTAMP:
1.36 perry 913: if (m == NULL || m->m_len < sizeof(int)) {
1.1 cgd 914: error = EINVAL;
915: goto bad;
916: }
917: if (*mtod(m, int *))
918: so->so_options |= optname;
919: else
920: so->so_options &= ~optname;
921: break;
922:
923: case SO_SNDBUF:
924: case SO_RCVBUF:
925: case SO_SNDLOWAT:
926: case SO_RCVLOWAT:
1.28 thorpej 927: {
928: int optval;
929:
1.36 perry 930: if (m == NULL || m->m_len < sizeof(int)) {
1.1 cgd 931: error = EINVAL;
932: goto bad;
933: }
1.28 thorpej 934:
935: /*
936: * Values < 1 make no sense for any of these
937: * options, so disallow them.
938: */
939: optval = *mtod(m, int *);
940: if (optval < 1) {
941: error = EINVAL;
942: goto bad;
943: }
944:
1.1 cgd 945: switch (optname) {
946:
947: case SO_SNDBUF:
948: case SO_RCVBUF:
949: if (sbreserve(optname == SO_SNDBUF ?
950: &so->so_snd : &so->so_rcv,
1.28 thorpej 951: (u_long) optval) == 0) {
1.1 cgd 952: error = ENOBUFS;
953: goto bad;
954: }
955: break;
956:
1.28 thorpej 957: /*
958: * Make sure the low-water is never greater than
959: * the high-water.
960: */
1.1 cgd 961: case SO_SNDLOWAT:
1.28 thorpej 962: so->so_snd.sb_lowat =
963: (optval > so->so_snd.sb_hiwat) ?
964: so->so_snd.sb_hiwat : optval;
1.1 cgd 965: break;
966: case SO_RCVLOWAT:
1.28 thorpej 967: so->so_rcv.sb_lowat =
968: (optval > so->so_rcv.sb_hiwat) ?
969: so->so_rcv.sb_hiwat : optval;
1.1 cgd 970: break;
971: }
972: break;
1.28 thorpej 973: }
1.1 cgd 974:
975: case SO_SNDTIMEO:
976: case SO_RCVTIMEO:
977: {
978: struct timeval *tv;
979: short val;
980:
1.36 perry 981: if (m == NULL || m->m_len < sizeof(*tv)) {
1.1 cgd 982: error = EINVAL;
983: goto bad;
984: }
985: tv = mtod(m, struct timeval *);
1.19 cgd 986: if (tv->tv_sec * hz + tv->tv_usec / tick > SHRT_MAX) {
1.1 cgd 987: error = EDOM;
988: goto bad;
989: }
990: val = tv->tv_sec * hz + tv->tv_usec / tick;
991:
992: switch (optname) {
993:
994: case SO_SNDTIMEO:
995: so->so_snd.sb_timeo = val;
996: break;
997: case SO_RCVTIMEO:
998: so->so_rcv.sb_timeo = val;
999: break;
1000: }
1001: break;
1002: }
1003:
1004: default:
1005: error = ENOPROTOOPT;
1006: break;
1007: }
1.15 mycroft 1008: if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
1009: (void) ((*so->so_proto->pr_ctloutput)
1010: (PRCO_SETOPT, so, level, optname, &m0));
1011: m = NULL; /* freed by protocol */
1012: }
1.1 cgd 1013: }
1.54 lukem 1014: bad:
1.1 cgd 1015: if (m)
1016: (void) m_free(m);
1017: return (error);
1018: }
1019:
1.14 mycroft 1020: int
1.54 lukem 1021: sogetopt(struct socket *so, int level, int optname, struct mbuf **mp)
1.1 cgd 1022: {
1.54 lukem 1023: struct mbuf *m;
1.1 cgd 1024:
1025: if (level != SOL_SOCKET) {
1026: if (so->so_proto && so->so_proto->pr_ctloutput) {
1027: return ((*so->so_proto->pr_ctloutput)
1028: (PRCO_GETOPT, so, level, optname, mp));
1029: } else
1030: return (ENOPROTOOPT);
1031: } else {
1032: m = m_get(M_WAIT, MT_SOOPTS);
1.36 perry 1033: m->m_len = sizeof(int);
1.1 cgd 1034:
1035: switch (optname) {
1036:
1037: case SO_LINGER:
1.36 perry 1038: m->m_len = sizeof(struct linger);
1.1 cgd 1039: mtod(m, struct linger *)->l_onoff =
1040: so->so_options & SO_LINGER;
1041: mtod(m, struct linger *)->l_linger = so->so_linger;
1042: break;
1043:
1044: case SO_USELOOPBACK:
1045: case SO_DONTROUTE:
1046: case SO_DEBUG:
1047: case SO_KEEPALIVE:
1048: case SO_REUSEADDR:
1.15 mycroft 1049: case SO_REUSEPORT:
1.1 cgd 1050: case SO_BROADCAST:
1051: case SO_OOBINLINE:
1.26 thorpej 1052: case SO_TIMESTAMP:
1.1 cgd 1053: *mtod(m, int *) = so->so_options & optname;
1054: break;
1055:
1056: case SO_TYPE:
1057: *mtod(m, int *) = so->so_type;
1058: break;
1059:
1060: case SO_ERROR:
1061: *mtod(m, int *) = so->so_error;
1062: so->so_error = 0;
1063: break;
1064:
1065: case SO_SNDBUF:
1066: *mtod(m, int *) = so->so_snd.sb_hiwat;
1067: break;
1068:
1069: case SO_RCVBUF:
1070: *mtod(m, int *) = so->so_rcv.sb_hiwat;
1071: break;
1072:
1073: case SO_SNDLOWAT:
1074: *mtod(m, int *) = so->so_snd.sb_lowat;
1075: break;
1076:
1077: case SO_RCVLOWAT:
1078: *mtod(m, int *) = so->so_rcv.sb_lowat;
1079: break;
1080:
1081: case SO_SNDTIMEO:
1082: case SO_RCVTIMEO:
1083: {
1084: int val = (optname == SO_SNDTIMEO ?
1085: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1086:
1087: m->m_len = sizeof(struct timeval);
1088: mtod(m, struct timeval *)->tv_sec = val / hz;
1089: mtod(m, struct timeval *)->tv_usec =
1.27 kleink 1090: (val % hz) * tick;
1.1 cgd 1091: break;
1092: }
1093:
1094: default:
1095: (void)m_free(m);
1096: return (ENOPROTOOPT);
1097: }
1098: *mp = m;
1099: return (0);
1100: }
1101: }
1102:
1.14 mycroft 1103: void
1.54 lukem 1104: sohasoutofband(struct socket *so)
1.1 cgd 1105: {
1106: struct proc *p;
1107:
1108: if (so->so_pgid < 0)
1109: gsignal(-so->so_pgid, SIGURG);
1110: else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0)
1111: psignal(p, SIGURG);
1.2 cgd 1112: selwakeup(&so->so_rcv.sb_sel);
1.1 cgd 1113: }
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