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1.1 nbrk 1: /* $OpenBSD: uipc_socket.c,v 1.66 2007/02/26 23:53:33 kurt Exp $ */
2: /* $NetBSD: uipc_socket.c,v 1.21 1996/02/04 02:17:52 christos Exp $ */
3:
4: /*
5: * Copyright (c) 1982, 1986, 1988, 1990, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the University nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: *
32: * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
33: */
34:
35: #include <sys/param.h>
36: #include <sys/systm.h>
37: #include <sys/proc.h>
38: #include <sys/file.h>
39: #include <sys/malloc.h>
40: #include <sys/mbuf.h>
41: #include <sys/domain.h>
42: #include <sys/kernel.h>
43: #include <sys/event.h>
44: #include <sys/protosw.h>
45: #include <sys/socket.h>
46: #include <sys/socketvar.h>
47: #include <sys/signalvar.h>
48: #include <sys/resourcevar.h>
49: #include <sys/pool.h>
50:
51: void filt_sordetach(struct knote *kn);
52: int filt_soread(struct knote *kn, long hint);
53: void filt_sowdetach(struct knote *kn);
54: int filt_sowrite(struct knote *kn, long hint);
55: int filt_solisten(struct knote *kn, long hint);
56:
57: struct filterops solisten_filtops =
58: { 1, NULL, filt_sordetach, filt_solisten };
59: struct filterops soread_filtops =
60: { 1, NULL, filt_sordetach, filt_soread };
61: struct filterops sowrite_filtops =
62: { 1, NULL, filt_sowdetach, filt_sowrite };
63:
64:
65: #ifndef SOMINCONN
66: #define SOMINCONN 80
67: #endif /* SOMINCONN */
68:
69: int somaxconn = SOMAXCONN;
70: int sominconn = SOMINCONN;
71:
72: struct pool socket_pool;
73:
74: void
75: soinit(void)
76: {
77:
78: pool_init(&socket_pool, sizeof(struct socket), 0, 0, 0, "sockpl", NULL);
79: }
80:
81: /*
82: * Socket operation routines.
83: * These routines are called by the routines in
84: * sys_socket.c or from a system process, and
85: * implement the semantics of socket operations by
86: * switching out to the protocol specific routines.
87: */
88: /*ARGSUSED*/
89: int
90: socreate(int dom, struct socket **aso, int type, int proto)
91: {
92: struct proc *p = curproc; /* XXX */
93: struct protosw *prp;
94: struct socket *so;
95: int error, s;
96:
97: if (proto)
98: prp = pffindproto(dom, proto, type);
99: else
100: prp = pffindtype(dom, type);
101: if (prp == NULL || prp->pr_usrreq == 0)
102: return (EPROTONOSUPPORT);
103: if (prp->pr_type != type)
104: return (EPROTOTYPE);
105: s = splsoftnet();
106: so = pool_get(&socket_pool, PR_WAITOK);
107: bzero(so, sizeof(*so));
108: TAILQ_INIT(&so->so_q0);
109: TAILQ_INIT(&so->so_q);
110: so->so_type = type;
111: if (p->p_ucred->cr_uid == 0)
112: so->so_state = SS_PRIV;
113: so->so_ruid = p->p_cred->p_ruid;
114: so->so_euid = p->p_ucred->cr_uid;
115: so->so_rgid = p->p_cred->p_rgid;
116: so->so_egid = p->p_ucred->cr_gid;
117: so->so_cpid = p->p_pid;
118: so->so_proto = prp;
119: error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
120: (struct mbuf *)(long)proto, NULL);
121: if (error) {
122: so->so_state |= SS_NOFDREF;
123: sofree(so);
124: splx(s);
125: return (error);
126: }
127: #ifdef COMPAT_SUNOS
128: {
129: extern struct emul emul_sunos;
130: if (p->p_emul == &emul_sunos && type == SOCK_DGRAM)
131: so->so_options |= SO_BROADCAST;
132: }
133: #endif
134: splx(s);
135: *aso = so;
136: return (0);
137: }
138:
139: int
140: sobind(struct socket *so, struct mbuf *nam)
141: {
142: int s = splsoftnet();
143: int error;
144:
145: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL);
146: splx(s);
147: return (error);
148: }
149:
150: int
151: solisten(struct socket *so, int backlog)
152: {
153: int s = splsoftnet(), error;
154:
155: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL, NULL, NULL);
156: if (error) {
157: splx(s);
158: return (error);
159: }
160: if (TAILQ_FIRST(&so->so_q) == NULL)
161: so->so_options |= SO_ACCEPTCONN;
162: if (backlog < 0 || backlog > somaxconn)
163: backlog = somaxconn;
164: if (backlog < sominconn)
165: backlog = sominconn;
166: so->so_qlimit = backlog;
167: splx(s);
168: return (0);
169: }
170:
171: /*
172: * Must be called at splsoftnet()
173: */
174:
175: void
176: sofree(struct socket *so)
177: {
178: splassert(IPL_SOFTNET);
179:
180: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
181: return;
182: if (so->so_head) {
183: /*
184: * We must not decommission a socket that's on the accept(2)
185: * queue. If we do, then accept(2) may hang after select(2)
186: * indicated that the listening socket was ready.
187: */
188: if (!soqremque(so, 0))
189: return;
190: }
191: sbrelease(&so->so_snd);
192: sorflush(so);
193: pool_put(&socket_pool, so);
194: }
195:
196: /*
197: * Close a socket on last file table reference removal.
198: * Initiate disconnect if connected.
199: * Free socket when disconnect complete.
200: */
201: int
202: soclose(struct socket *so)
203: {
204: struct socket *so2;
205: int s = splsoftnet(); /* conservative */
206: int error = 0;
207:
208: if (so->so_options & SO_ACCEPTCONN) {
209: while ((so2 = TAILQ_FIRST(&so->so_q0)) != NULL) {
210: (void) soqremque(so2, 0);
211: (void) soabort(so2);
212: }
213: while ((so2 = TAILQ_FIRST(&so->so_q)) != NULL) {
214: (void) soqremque(so2, 1);
215: (void) soabort(so2);
216: }
217: }
218: if (so->so_pcb == 0)
219: goto discard;
220: if (so->so_state & SS_ISCONNECTED) {
221: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
222: error = sodisconnect(so);
223: if (error)
224: goto drop;
225: }
226: if (so->so_options & SO_LINGER) {
227: if ((so->so_state & SS_ISDISCONNECTING) &&
228: (so->so_state & SS_NBIO))
229: goto drop;
230: while (so->so_state & SS_ISCONNECTED) {
231: error = tsleep(&so->so_timeo,
232: PSOCK | PCATCH, netcls,
233: so->so_linger * hz);
234: if (error)
235: break;
236: }
237: }
238: }
239: drop:
240: if (so->so_pcb) {
241: int error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH, NULL,
242: NULL, NULL);
243: if (error == 0)
244: error = error2;
245: }
246: discard:
247: if (so->so_state & SS_NOFDREF)
248: panic("soclose: NOFDREF");
249: so->so_state |= SS_NOFDREF;
250: sofree(so);
251: splx(s);
252: return (error);
253: }
254:
255: /*
256: * Must be called at splsoftnet.
257: */
258: int
259: soabort(struct socket *so)
260: {
261: splassert(IPL_SOFTNET);
262:
263: return (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL, NULL, NULL);
264: }
265:
266: int
267: soaccept(struct socket *so, struct mbuf *nam)
268: {
269: int s = splsoftnet();
270: int error = 0;
271:
272: if ((so->so_state & SS_NOFDREF) == 0)
273: panic("soaccept: !NOFDREF");
274: so->so_state &= ~SS_NOFDREF;
275: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
276: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
277: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, NULL,
278: nam, NULL);
279: else
280: error = ECONNABORTED;
281: splx(s);
282: return (error);
283: }
284:
285: int
286: soconnect(struct socket *so, struct mbuf *nam)
287: {
288: int s;
289: int error;
290:
291: if (so->so_options & SO_ACCEPTCONN)
292: return (EOPNOTSUPP);
293: s = splsoftnet();
294: /*
295: * If protocol is connection-based, can only connect once.
296: * Otherwise, if connected, try to disconnect first.
297: * This allows user to disconnect by connecting to, e.g.,
298: * a null address.
299: */
300: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
301: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
302: (error = sodisconnect(so))))
303: error = EISCONN;
304: else
305: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
306: NULL, nam, NULL);
307: splx(s);
308: return (error);
309: }
310:
311: int
312: soconnect2(struct socket *so1, struct socket *so2)
313: {
314: int s = splsoftnet();
315: int error;
316:
317: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2, NULL,
318: (struct mbuf *)so2, NULL);
319: splx(s);
320: return (error);
321: }
322:
323: int
324: sodisconnect(struct socket *so)
325: {
326: int s = splsoftnet();
327: int error;
328:
329: if ((so->so_state & SS_ISCONNECTED) == 0) {
330: error = ENOTCONN;
331: goto bad;
332: }
333: if (so->so_state & SS_ISDISCONNECTING) {
334: error = EALREADY;
335: goto bad;
336: }
337: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, NULL, NULL,
338: NULL);
339: bad:
340: splx(s);
341: return (error);
342: }
343:
344: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
345: /*
346: * Send on a socket.
347: * If send must go all at once and message is larger than
348: * send buffering, then hard error.
349: * Lock against other senders.
350: * If must go all at once and not enough room now, then
351: * inform user that this would block and do nothing.
352: * Otherwise, if nonblocking, send as much as possible.
353: * The data to be sent is described by "uio" if nonzero,
354: * otherwise by the mbuf chain "top" (which must be null
355: * if uio is not). Data provided in mbuf chain must be small
356: * enough to send all at once.
357: *
358: * Returns nonzero on error, timeout or signal; callers
359: * must check for short counts if EINTR/ERESTART are returned.
360: * Data and control buffers are freed on return.
361: */
362: int
363: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
364: struct mbuf *control, int flags)
365: {
366: struct mbuf **mp;
367: struct mbuf *m;
368: long space, len, mlen, clen = 0;
369: quad_t resid;
370: int error, s, dontroute;
371: int atomic = sosendallatonce(so) || top;
372:
373: if (uio)
374: resid = uio->uio_resid;
375: else
376: resid = top->m_pkthdr.len;
377: /*
378: * In theory resid should be unsigned (since uio->uio_resid is).
379: * However, space must be signed, as it might be less than 0
380: * if we over-committed, and we must use a signed comparison
381: * of space and resid. On the other hand, a negative resid
382: * causes us to loop sending 0-length segments to the protocol.
383: * MSG_EOR on a SOCK_STREAM socket is also invalid.
384: */
385: if (resid < 0 ||
386: (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
387: error = EINVAL;
388: goto out;
389: }
390: dontroute =
391: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
392: (so->so_proto->pr_flags & PR_ATOMIC);
393: if (uio && uio->uio_procp)
394: uio->uio_procp->p_stats->p_ru.ru_msgsnd++;
395: if (control)
396: clen = control->m_len;
397: #define snderr(errno) { error = errno; splx(s); goto release; }
398:
399: restart:
400: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
401: goto out;
402: so->so_state |= SS_ISSENDING;
403: do {
404: s = splsoftnet();
405: if (so->so_state & SS_CANTSENDMORE)
406: snderr(EPIPE);
407: if (so->so_error) {
408: error = so->so_error;
409: so->so_error = 0;
410: splx(s);
411: goto release;
412: }
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;
424: if ((atomic && resid > so->so_snd.sb_hiwat) ||
425: clen > so->so_snd.sb_hiwat)
426: snderr(EMSGSIZE);
427: if (space < resid + clen && uio &&
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: so->so_state &= ~SS_ISSENDING;
434: splx(s);
435: if (error)
436: goto out;
437: goto restart;
438: }
439: splx(s);
440: mp = ⊤
441: space -= clen;
442: do {
443: if (uio == NULL) {
444: /*
445: * Data is prepackaged in "top".
446: */
447: resid = 0;
448: if (flags & MSG_EOR)
449: top->m_flags |= M_EOR;
450: } else do {
451: if (top == 0) {
452: MGETHDR(m, M_WAIT, MT_DATA);
453: mlen = MHLEN;
454: m->m_pkthdr.len = 0;
455: m->m_pkthdr.rcvif = (struct ifnet *)0;
456: } else {
457: MGET(m, M_WAIT, MT_DATA);
458: mlen = MLEN;
459: }
460: if (resid >= MINCLSIZE && space >= MCLBYTES) {
461: MCLGET(m, M_WAIT);
462: if ((m->m_flags & M_EXT) == 0)
463: goto nopages;
464: mlen = MCLBYTES;
465: if (atomic && top == 0) {
466: len = lmin(MCLBYTES - max_hdr, resid);
467: m->m_data += max_hdr;
468: } else
469: len = lmin(MCLBYTES, resid);
470: space -= len;
471: } else {
472: nopages:
473: len = lmin(lmin(mlen, resid), space);
474: space -= len;
475: /*
476: * For datagram protocols, leave room
477: * for protocol headers in first mbuf.
478: */
479: if (atomic && top == 0 && len < mlen)
480: MH_ALIGN(m, len);
481: }
482: error = uiomove(mtod(m, caddr_t), (int)len,
483: uio);
484: resid = uio->uio_resid;
485: m->m_len = len;
486: *mp = m;
487: top->m_pkthdr.len += len;
488: if (error)
489: goto release;
490: mp = &m->m_next;
491: if (resid <= 0) {
492: if (flags & MSG_EOR)
493: top->m_flags |= M_EOR;
494: break;
495: }
496: } while (space > 0 && atomic);
497: if (dontroute)
498: so->so_options |= SO_DONTROUTE;
499: s = splsoftnet(); /* XXX */
500: if (resid <= 0)
501: so->so_state &= ~SS_ISSENDING;
502: error = (*so->so_proto->pr_usrreq)(so,
503: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
504: top, addr, control);
505: splx(s);
506: if (dontroute)
507: so->so_options &= ~SO_DONTROUTE;
508: clen = 0;
509: control = 0;
510: top = 0;
511: mp = ⊤
512: if (error)
513: goto release;
514: } while (resid && space > 0);
515: } while (resid);
516:
517: release:
518: so->so_state &= ~SS_ISSENDING;
519: sbunlock(&so->so_snd);
520: out:
521: if (top)
522: m_freem(top);
523: if (control)
524: m_freem(control);
525: return (error);
526: }
527:
528: /*
529: * Implement receive operations on a socket.
530: * We depend on the way that records are added to the sockbuf
531: * by sbappend*. In particular, each record (mbufs linked through m_next)
532: * must begin with an address if the protocol so specifies,
533: * followed by an optional mbuf or mbufs containing ancillary data,
534: * and then zero or more mbufs of data.
535: * In order to avoid blocking network interrupts for the entire time here,
536: * we splx() while doing the actual copy to user space.
537: * Although the sockbuf is locked, new data may still be appended,
538: * and thus we must maintain consistency of the sockbuf during that time.
539: *
540: * The caller may receive the data as a single mbuf chain by supplying
541: * an mbuf **mp0 for use in returning the chain. The uio is then used
542: * only for the count in uio_resid.
543: */
544: int
545: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
546: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
547: {
548: struct mbuf *m, **mp;
549: int flags, len, error, s, offset;
550: struct protosw *pr = so->so_proto;
551: struct mbuf *nextrecord;
552: int moff, type = 0;
553: size_t orig_resid = uio->uio_resid;
554: int uio_error = 0;
555: int resid;
556:
557: mp = mp0;
558: if (paddr)
559: *paddr = 0;
560: if (controlp)
561: *controlp = 0;
562: if (flagsp)
563: flags = *flagsp &~ MSG_EOR;
564: else
565: flags = 0;
566: if (so->so_state & SS_NBIO)
567: flags |= MSG_DONTWAIT;
568: if (flags & MSG_OOB) {
569: m = m_get(M_WAIT, MT_DATA);
570: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
571: (struct mbuf *)(long)(flags & MSG_PEEK), NULL);
572: if (error)
573: goto bad;
574: do {
575: error = uiomove(mtod(m, caddr_t),
576: (int) min(uio->uio_resid, m->m_len), uio);
577: m = m_free(m);
578: } while (uio->uio_resid && error == 0 && m);
579: bad:
580: if (m)
581: m_freem(m);
582: return (error);
583: }
584: if (mp)
585: *mp = NULL;
586: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
587: (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL);
588:
589: restart:
590: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0)
591: return (error);
592: s = splsoftnet();
593:
594: m = so->so_rcv.sb_mb;
595: /*
596: * If we have less data than requested, block awaiting more
597: * (subject to any timeout) if:
598: * 1. the current count is less than the low water mark,
599: * 2. MSG_WAITALL is set, and it is possible to do the entire
600: * receive operation at once if we block (resid <= hiwat), or
601: * 3. MSG_DONTWAIT is not set.
602: * If MSG_WAITALL is set but resid is larger than the receive buffer,
603: * we have to do the receive in sections, and thus risk returning
604: * a short count if a timeout or signal occurs after we start.
605: */
606: if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
607: so->so_rcv.sb_cc < uio->uio_resid) &&
608: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
609: ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
610: m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) {
611: #ifdef DIAGNOSTIC
612: if (m == NULL && so->so_rcv.sb_cc)
613: panic("receive 1");
614: #endif
615: if (so->so_error) {
616: if (m)
617: goto dontblock;
618: error = so->so_error;
619: if ((flags & MSG_PEEK) == 0)
620: so->so_error = 0;
621: goto release;
622: }
623: if (so->so_state & SS_CANTRCVMORE) {
624: if (m)
625: goto dontblock;
626: else
627: goto release;
628: }
629: for (; m; m = m->m_next)
630: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
631: m = so->so_rcv.sb_mb;
632: goto dontblock;
633: }
634: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
635: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
636: error = ENOTCONN;
637: goto release;
638: }
639: if (uio->uio_resid == 0 && controlp == NULL)
640: goto release;
641: if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) {
642: error = EWOULDBLOCK;
643: goto release;
644: }
645: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
646: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
647: sbunlock(&so->so_rcv);
648: error = sbwait(&so->so_rcv);
649: splx(s);
650: if (error)
651: return (error);
652: goto restart;
653: }
654: dontblock:
655: /*
656: * On entry here, m points to the first record of the socket buffer.
657: * While we process the initial mbufs containing address and control
658: * info, we save a copy of m->m_nextpkt into nextrecord.
659: */
660: if (uio->uio_procp)
661: uio->uio_procp->p_stats->p_ru.ru_msgrcv++;
662: KASSERT(m == so->so_rcv.sb_mb);
663: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
664: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
665: nextrecord = m->m_nextpkt;
666: if (pr->pr_flags & PR_ADDR) {
667: #ifdef DIAGNOSTIC
668: if (m->m_type != MT_SONAME)
669: panic("receive 1a");
670: #endif
671: orig_resid = 0;
672: if (flags & MSG_PEEK) {
673: if (paddr)
674: *paddr = m_copy(m, 0, m->m_len);
675: m = m->m_next;
676: } else {
677: sbfree(&so->so_rcv, m);
678: if (paddr) {
679: *paddr = m;
680: so->so_rcv.sb_mb = m->m_next;
681: m->m_next = 0;
682: m = so->so_rcv.sb_mb;
683: } else {
684: MFREE(m, so->so_rcv.sb_mb);
685: m = so->so_rcv.sb_mb;
686: }
687: }
688: }
689: while (m && m->m_type == MT_CONTROL && error == 0) {
690: if (flags & MSG_PEEK) {
691: if (controlp)
692: *controlp = m_copy(m, 0, m->m_len);
693: m = m->m_next;
694: } else {
695: sbfree(&so->so_rcv, m);
696: if (controlp) {
697: if (pr->pr_domain->dom_externalize &&
698: mtod(m, struct cmsghdr *)->cmsg_type ==
699: SCM_RIGHTS)
700: error = (*pr->pr_domain->dom_externalize)(m);
701: *controlp = m;
702: so->so_rcv.sb_mb = m->m_next;
703: m->m_next = 0;
704: m = so->so_rcv.sb_mb;
705: } else {
706: /*
707: * Dispose of any SCM_RIGHTS message that went
708: * through the read path rather than recv.
709: */
710: if (pr->pr_domain->dom_dispose &&
711: mtod(m, struct cmsghdr *)->cmsg_type == SCM_RIGHTS)
712: pr->pr_domain->dom_dispose(m);
713: MFREE(m, so->so_rcv.sb_mb);
714: m = so->so_rcv.sb_mb;
715: }
716: }
717: if (controlp) {
718: orig_resid = 0;
719: controlp = &(*controlp)->m_next;
720: }
721: }
722:
723: /*
724: * If m is non-NULL, we have some data to read. From now on,
725: * make sure to keep sb_lastrecord consistent when working on
726: * the last packet on the chain (nextrecord == NULL) and we
727: * change m->m_nextpkt.
728: */
729: if (m) {
730: if ((flags & MSG_PEEK) == 0) {
731: m->m_nextpkt = nextrecord;
732: /*
733: * If nextrecord == NULL (this is a single chain),
734: * then sb_lastrecord may not be valid here if m
735: * was changed earlier.
736: */
737: if (nextrecord == NULL) {
738: KASSERT(so->so_rcv.sb_mb == m);
739: so->so_rcv.sb_lastrecord = m;
740: }
741: }
742: type = m->m_type;
743: if (type == MT_OOBDATA)
744: flags |= MSG_OOB;
745: if (m->m_flags & M_BCAST)
746: flags |= MSG_BCAST;
747: if (m->m_flags & M_MCAST)
748: flags |= MSG_MCAST;
749: } else {
750: if ((flags & MSG_PEEK) == 0) {
751: KASSERT(so->so_rcv.sb_mb == m);
752: so->so_rcv.sb_mb = nextrecord;
753: SB_EMPTY_FIXUP(&so->so_rcv);
754: }
755: }
756: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
757: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
758:
759: moff = 0;
760: offset = 0;
761: while (m && uio->uio_resid > 0 && error == 0) {
762: if (m->m_type == MT_OOBDATA) {
763: if (type != MT_OOBDATA)
764: break;
765: } else if (type == MT_OOBDATA)
766: break;
767: #ifdef DIAGNOSTIC
768: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
769: panic("receive 3");
770: #endif
771: so->so_state &= ~SS_RCVATMARK;
772: len = uio->uio_resid;
773: if (so->so_oobmark && len > so->so_oobmark - offset)
774: len = so->so_oobmark - offset;
775: if (len > m->m_len - moff)
776: len = m->m_len - moff;
777: /*
778: * If mp is set, just pass back the mbufs.
779: * Otherwise copy them out via the uio, then free.
780: * Sockbuf must be consistent here (points to current mbuf,
781: * it points to next record) when we drop priority;
782: * we must note any additions to the sockbuf when we
783: * block interrupts again.
784: */
785: if (mp == NULL && uio_error == 0) {
786: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
787: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
788: resid = uio->uio_resid;
789: splx(s);
790: uio_error =
791: uiomove(mtod(m, caddr_t) + moff, (int)len,
792: uio);
793: s = splsoftnet();
794: if (uio_error)
795: uio->uio_resid = resid - len;
796: } else
797: uio->uio_resid -= len;
798: if (len == m->m_len - moff) {
799: if (m->m_flags & M_EOR)
800: flags |= MSG_EOR;
801: if (flags & MSG_PEEK) {
802: m = m->m_next;
803: moff = 0;
804: } else {
805: nextrecord = m->m_nextpkt;
806: sbfree(&so->so_rcv, m);
807: if (mp) {
808: *mp = m;
809: mp = &m->m_next;
810: so->so_rcv.sb_mb = m = m->m_next;
811: *mp = NULL;
812: } else {
813: MFREE(m, so->so_rcv.sb_mb);
814: m = so->so_rcv.sb_mb;
815: }
816: /*
817: * If m != NULL, we also know that
818: * so->so_rcv.sb_mb != NULL.
819: */
820: KASSERT(so->so_rcv.sb_mb == m);
821: if (m) {
822: m->m_nextpkt = nextrecord;
823: if (nextrecord == NULL)
824: so->so_rcv.sb_lastrecord = m;
825: } else {
826: so->so_rcv.sb_mb = nextrecord;
827: SB_EMPTY_FIXUP(&so->so_rcv);
828: }
829: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
830: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
831: }
832: } else {
833: if (flags & MSG_PEEK)
834: moff += len;
835: else {
836: if (mp)
837: *mp = m_copym(m, 0, len, M_WAIT);
838: m->m_data += len;
839: m->m_len -= len;
840: so->so_rcv.sb_cc -= len;
841: so->so_rcv.sb_datacc -= len;
842: }
843: }
844: if (so->so_oobmark) {
845: if ((flags & MSG_PEEK) == 0) {
846: so->so_oobmark -= len;
847: if (so->so_oobmark == 0) {
848: so->so_state |= SS_RCVATMARK;
849: break;
850: }
851: } else {
852: offset += len;
853: if (offset == so->so_oobmark)
854: break;
855: }
856: }
857: if (flags & MSG_EOR)
858: break;
859: /*
860: * If the MSG_WAITALL flag is set (for non-atomic socket),
861: * we must not quit until "uio->uio_resid == 0" or an error
862: * termination. If a signal/timeout occurs, return
863: * with a short count but without error.
864: * Keep sockbuf locked against other readers.
865: */
866: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
867: !sosendallatonce(so) && !nextrecord) {
868: if (so->so_error || so->so_state & SS_CANTRCVMORE)
869: break;
870: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
871: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
872: error = sbwait(&so->so_rcv);
873: if (error) {
874: sbunlock(&so->so_rcv);
875: splx(s);
876: return (0);
877: }
878: if ((m = so->so_rcv.sb_mb) != NULL)
879: nextrecord = m->m_nextpkt;
880: }
881: }
882:
883: if (m && pr->pr_flags & PR_ATOMIC) {
884: flags |= MSG_TRUNC;
885: if ((flags & MSG_PEEK) == 0)
886: (void) sbdroprecord(&so->so_rcv);
887: }
888: if ((flags & MSG_PEEK) == 0) {
889: if (m == NULL) {
890: /*
891: * First part is an inline SB_EMPTY_FIXUP(). Second
892: * part makes sure sb_lastrecord is up-to-date if
893: * there is still data in the socket buffer.
894: */
895: so->so_rcv.sb_mb = nextrecord;
896: if (so->so_rcv.sb_mb == NULL) {
897: so->so_rcv.sb_mbtail = NULL;
898: so->so_rcv.sb_lastrecord = NULL;
899: } else if (nextrecord->m_nextpkt == NULL)
900: so->so_rcv.sb_lastrecord = nextrecord;
901: }
902: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
903: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
904: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
905: (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
906: (struct mbuf *)(long)flags, NULL);
907: }
908: if (orig_resid == uio->uio_resid && orig_resid &&
909: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
910: sbunlock(&so->so_rcv);
911: splx(s);
912: goto restart;
913: }
914:
915: if (uio_error)
916: error = uio_error;
917:
918: if (flagsp)
919: *flagsp |= flags;
920: release:
921: sbunlock(&so->so_rcv);
922: splx(s);
923: return (error);
924: }
925:
926: int
927: soshutdown(struct socket *so, int how)
928: {
929: struct protosw *pr = so->so_proto;
930:
931: switch (how) {
932: case SHUT_RD:
933: case SHUT_RDWR:
934: sorflush(so);
935: if (how == SHUT_RD)
936: return (0);
937: /* FALLTHROUGH */
938: case SHUT_WR:
939: return (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL, NULL, NULL);
940: default:
941: return (EINVAL);
942: }
943: }
944:
945: void
946: sorflush(struct socket *so)
947: {
948: struct sockbuf *sb = &so->so_rcv;
949: struct protosw *pr = so->so_proto;
950: int s;
951: struct sockbuf asb;
952:
953: sb->sb_flags |= SB_NOINTR;
954: (void) sblock(sb, M_WAITOK);
955: s = splnet();
956: socantrcvmore(so);
957: sbunlock(sb);
958: asb = *sb;
959: bzero(sb, sizeof (*sb));
960: /* XXX - the bzero stumps all over so_rcv */
961: if (asb.sb_flags & SB_KNOTE) {
962: sb->sb_sel.si_note = asb.sb_sel.si_note;
963: sb->sb_flags = SB_KNOTE;
964: }
965: splx(s);
966: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
967: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
968: sbrelease(&asb);
969: }
970:
971: int
972: sosetopt(struct socket *so, int level, int optname, struct mbuf *m0)
973: {
974: int error = 0;
975: struct mbuf *m = m0;
976:
977: if (level != SOL_SOCKET) {
978: if (so->so_proto && so->so_proto->pr_ctloutput)
979: return ((*so->so_proto->pr_ctloutput)
980: (PRCO_SETOPT, so, level, optname, &m0));
981: error = ENOPROTOOPT;
982: } else {
983: switch (optname) {
984:
985: case SO_LINGER:
986: if (m == NULL || m->m_len != sizeof (struct linger) ||
987: mtod(m, struct linger *)->l_linger < 0 ||
988: mtod(m, struct linger *)->l_linger > SHRT_MAX) {
989: error = EINVAL;
990: goto bad;
991: }
992: so->so_linger = mtod(m, struct linger *)->l_linger;
993: /* FALLTHROUGH */
994:
995: case SO_DEBUG:
996: case SO_KEEPALIVE:
997: case SO_DONTROUTE:
998: case SO_USELOOPBACK:
999: case SO_BROADCAST:
1000: case SO_REUSEADDR:
1001: case SO_REUSEPORT:
1002: case SO_OOBINLINE:
1003: case SO_JUMBO:
1004: if (m == NULL || m->m_len < sizeof (int)) {
1005: error = EINVAL;
1006: goto bad;
1007: }
1008: if (*mtod(m, int *))
1009: so->so_options |= optname;
1010: else
1011: so->so_options &= ~optname;
1012: break;
1013:
1014: case SO_SNDBUF:
1015: case SO_RCVBUF:
1016: case SO_SNDLOWAT:
1017: case SO_RCVLOWAT:
1018: {
1019: u_long cnt;
1020:
1021: if (m == NULL || m->m_len < sizeof (int)) {
1022: error = EINVAL;
1023: goto bad;
1024: }
1025: cnt = *mtod(m, int *);
1026: if ((long)cnt <= 0)
1027: cnt = 1;
1028: switch (optname) {
1029:
1030: case SO_SNDBUF:
1031: if (sbcheckreserve(cnt, so->so_snd.sb_hiwat) ||
1032: sbreserve(&so->so_snd, cnt) == 0) {
1033: error = ENOBUFS;
1034: goto bad;
1035: }
1036: break;
1037:
1038: case SO_RCVBUF:
1039: if (sbcheckreserve(cnt, so->so_rcv.sb_hiwat) ||
1040: sbreserve(&so->so_rcv, cnt) == 0) {
1041: error = ENOBUFS;
1042: goto bad;
1043: }
1044: break;
1045:
1046: case SO_SNDLOWAT:
1047: so->so_snd.sb_lowat = (cnt > so->so_snd.sb_hiwat) ?
1048: so->so_snd.sb_hiwat : cnt;
1049: break;
1050: case SO_RCVLOWAT:
1051: so->so_rcv.sb_lowat = (cnt > so->so_rcv.sb_hiwat) ?
1052: so->so_rcv.sb_hiwat : cnt;
1053: break;
1054: }
1055: break;
1056: }
1057:
1058: case SO_SNDTIMEO:
1059: case SO_RCVTIMEO:
1060: {
1061: struct timeval *tv;
1062: short val;
1063:
1064: if (m == NULL || m->m_len < sizeof (*tv)) {
1065: error = EINVAL;
1066: goto bad;
1067: }
1068: tv = mtod(m, struct timeval *);
1069: if (tv->tv_sec > (SHRT_MAX - tv->tv_usec / tick) / hz) {
1070: error = EDOM;
1071: goto bad;
1072: }
1073: val = tv->tv_sec * hz + tv->tv_usec / tick;
1074: if (val == 0 && tv->tv_usec != 0)
1075: val = 1;
1076:
1077: switch (optname) {
1078:
1079: case SO_SNDTIMEO:
1080: so->so_snd.sb_timeo = val;
1081: break;
1082: case SO_RCVTIMEO:
1083: so->so_rcv.sb_timeo = val;
1084: break;
1085: }
1086: break;
1087: }
1088:
1089: default:
1090: error = ENOPROTOOPT;
1091: break;
1092: }
1093: if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
1094: (void) ((*so->so_proto->pr_ctloutput)
1095: (PRCO_SETOPT, so, level, optname, &m0));
1096: m = NULL; /* freed by protocol */
1097: }
1098: }
1099: bad:
1100: if (m)
1101: (void) m_free(m);
1102: return (error);
1103: }
1104:
1105: int
1106: sogetopt(struct socket *so, int level, int optname, struct mbuf **mp)
1107: {
1108: struct mbuf *m;
1109:
1110: if (level != SOL_SOCKET) {
1111: if (so->so_proto && so->so_proto->pr_ctloutput) {
1112: return ((*so->so_proto->pr_ctloutput)
1113: (PRCO_GETOPT, so, level, optname, mp));
1114: } else
1115: return (ENOPROTOOPT);
1116: } else {
1117: m = m_get(M_WAIT, MT_SOOPTS);
1118: m->m_len = sizeof (int);
1119:
1120: switch (optname) {
1121:
1122: case SO_LINGER:
1123: m->m_len = sizeof (struct linger);
1124: mtod(m, struct linger *)->l_onoff =
1125: so->so_options & SO_LINGER;
1126: mtod(m, struct linger *)->l_linger = so->so_linger;
1127: break;
1128:
1129: case SO_USELOOPBACK:
1130: case SO_DONTROUTE:
1131: case SO_DEBUG:
1132: case SO_KEEPALIVE:
1133: case SO_REUSEADDR:
1134: case SO_REUSEPORT:
1135: case SO_BROADCAST:
1136: case SO_OOBINLINE:
1137: case SO_JUMBO:
1138: *mtod(m, int *) = so->so_options & optname;
1139: break;
1140:
1141: case SO_TYPE:
1142: *mtod(m, int *) = so->so_type;
1143: break;
1144:
1145: case SO_ERROR:
1146: *mtod(m, int *) = so->so_error;
1147: so->so_error = 0;
1148: break;
1149:
1150: case SO_SNDBUF:
1151: *mtod(m, int *) = so->so_snd.sb_hiwat;
1152: break;
1153:
1154: case SO_RCVBUF:
1155: *mtod(m, int *) = so->so_rcv.sb_hiwat;
1156: break;
1157:
1158: case SO_SNDLOWAT:
1159: *mtod(m, int *) = so->so_snd.sb_lowat;
1160: break;
1161:
1162: case SO_RCVLOWAT:
1163: *mtod(m, int *) = so->so_rcv.sb_lowat;
1164: break;
1165:
1166: case SO_SNDTIMEO:
1167: case SO_RCVTIMEO:
1168: {
1169: int val = (optname == SO_SNDTIMEO ?
1170: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1171:
1172: m->m_len = sizeof(struct timeval);
1173: mtod(m, struct timeval *)->tv_sec = val / hz;
1174: mtod(m, struct timeval *)->tv_usec =
1175: (val % hz) * tick;
1176: break;
1177: }
1178:
1179: default:
1180: (void)m_free(m);
1181: return (ENOPROTOOPT);
1182: }
1183: *mp = m;
1184: return (0);
1185: }
1186: }
1187:
1188: void
1189: sohasoutofband(struct socket *so)
1190: {
1191: csignal(so->so_pgid, SIGURG, so->so_siguid, so->so_sigeuid);
1192: selwakeup(&so->so_rcv.sb_sel);
1193: }
1194:
1195: int
1196: soo_kqfilter(struct file *fp, struct knote *kn)
1197: {
1198: struct socket *so = (struct socket *)kn->kn_fp->f_data;
1199: struct sockbuf *sb;
1200: int s;
1201:
1202: switch (kn->kn_filter) {
1203: case EVFILT_READ:
1204: if (so->so_options & SO_ACCEPTCONN)
1205: kn->kn_fop = &solisten_filtops;
1206: else
1207: kn->kn_fop = &soread_filtops;
1208: sb = &so->so_rcv;
1209: break;
1210: case EVFILT_WRITE:
1211: kn->kn_fop = &sowrite_filtops;
1212: sb = &so->so_snd;
1213: break;
1214: default:
1215: return (1);
1216: }
1217:
1218: s = splnet();
1219: SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext);
1220: sb->sb_flags |= SB_KNOTE;
1221: splx(s);
1222: return (0);
1223: }
1224:
1225: void
1226: filt_sordetach(struct knote *kn)
1227: {
1228: struct socket *so = (struct socket *)kn->kn_fp->f_data;
1229: int s = splnet();
1230:
1231: SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext);
1232: if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note))
1233: so->so_rcv.sb_flags &= ~SB_KNOTE;
1234: splx(s);
1235: }
1236:
1237: /*ARGSUSED*/
1238: int
1239: filt_soread(struct knote *kn, long hint)
1240: {
1241: struct socket *so = (struct socket *)kn->kn_fp->f_data;
1242:
1243: kn->kn_data = so->so_rcv.sb_cc;
1244: if (so->so_state & SS_CANTRCVMORE) {
1245: kn->kn_flags |= EV_EOF;
1246: kn->kn_fflags = so->so_error;
1247: return (1);
1248: }
1249: if (so->so_error) /* temporary udp error */
1250: return (1);
1251: if (kn->kn_sfflags & NOTE_LOWAT)
1252: return (kn->kn_data >= kn->kn_sdata);
1253: return (kn->kn_data >= so->so_rcv.sb_lowat);
1254: }
1255:
1256: void
1257: filt_sowdetach(struct knote *kn)
1258: {
1259: struct socket *so = (struct socket *)kn->kn_fp->f_data;
1260: int s = splnet();
1261:
1262: SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext);
1263: if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note))
1264: so->so_snd.sb_flags &= ~SB_KNOTE;
1265: splx(s);
1266: }
1267:
1268: /*ARGSUSED*/
1269: int
1270: filt_sowrite(struct knote *kn, long hint)
1271: {
1272: struct socket *so = (struct socket *)kn->kn_fp->f_data;
1273:
1274: kn->kn_data = sbspace(&so->so_snd);
1275: if (so->so_state & SS_CANTSENDMORE) {
1276: kn->kn_flags |= EV_EOF;
1277: kn->kn_fflags = so->so_error;
1278: return (1);
1279: }
1280: if (so->so_error) /* temporary udp error */
1281: return (1);
1282: if (((so->so_state & SS_ISCONNECTED) == 0) &&
1283: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1284: return (0);
1285: if (kn->kn_sfflags & NOTE_LOWAT)
1286: return (kn->kn_data >= kn->kn_sdata);
1287: return (kn->kn_data >= so->so_snd.sb_lowat);
1288: }
1289:
1290: /*ARGSUSED*/
1291: int
1292: filt_solisten(struct knote *kn, long hint)
1293: {
1294: struct socket *so = (struct socket *)kn->kn_fp->f_data;
1295:
1296: kn->kn_data = so->so_qlen;
1297: return (so->so_qlen != 0);
1298: }