Annotation of src/sys/kern/uipc_socket.c, Revision 1.165
1.165 ! christos 1: /* $NetBSD: uipc_socket.c,v 1.164 2008/05/01 09:21:56 drochner Exp $ */
1.64 thorpej 2:
3: /*-
1.154 ad 4: * Copyright (c) 2002, 2007, 2008 The NetBSD Foundation, Inc.
1.64 thorpej 5: * All rights reserved.
6: *
7: * This code is derived from software contributed to The NetBSD Foundation
8: * by Jason R. Thorpe of Wasabi Systems, Inc.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29: * POSSIBILITY OF SUCH DAMAGE.
30: */
1.16 cgd 31:
1.1 cgd 32: /*
1.159 ad 33: * Copyright (c) 2004 The FreeBSD Foundation
34: * Copyright (c) 2004 Robert Watson
1.15 mycroft 35: * Copyright (c) 1982, 1986, 1988, 1990, 1993
36: * The Regents of the University of California. All rights reserved.
1.1 cgd 37: *
38: * Redistribution and use in source and binary forms, with or without
39: * modification, are permitted provided that the following conditions
40: * are met:
41: * 1. Redistributions of source code must retain the above copyright
42: * notice, this list of conditions and the following disclaimer.
43: * 2. Redistributions in binary form must reproduce the above copyright
44: * notice, this list of conditions and the following disclaimer in the
45: * documentation and/or other materials provided with the distribution.
1.85 agc 46: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 47: * may be used to endorse or promote products derived from this software
48: * without specific prior written permission.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60: * SUCH DAMAGE.
61: *
1.32 fvdl 62: * @(#)uipc_socket.c 8.6 (Berkeley) 5/2/95
1.1 cgd 63: */
1.59 lukem 64:
65: #include <sys/cdefs.h>
1.165 ! christos 66: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.164 2008/05/01 09:21:56 drochner Exp $");
1.64 thorpej 67:
68: #include "opt_sock_counters.h"
69: #include "opt_sosend_loan.h"
1.81 martin 70: #include "opt_mbuftrace.h"
1.84 ragge 71: #include "opt_somaxkva.h"
1.1 cgd 72:
1.9 mycroft 73: #include <sys/param.h>
74: #include <sys/systm.h>
75: #include <sys/proc.h>
76: #include <sys/file.h>
1.142 dyoung 77: #include <sys/filedesc.h>
1.9 mycroft 78: #include <sys/malloc.h>
79: #include <sys/mbuf.h>
80: #include <sys/domain.h>
81: #include <sys/kernel.h>
82: #include <sys/protosw.h>
83: #include <sys/socket.h>
84: #include <sys/socketvar.h>
1.21 christos 85: #include <sys/signalvar.h>
1.9 mycroft 86: #include <sys/resourcevar.h>
1.72 jdolecek 87: #include <sys/event.h>
1.89 christos 88: #include <sys/poll.h>
1.118 elad 89: #include <sys/kauth.h>
1.136 ad 90: #include <sys/mutex.h>
91: #include <sys/condvar.h>
1.37 thorpej 92:
1.64 thorpej 93: #include <uvm/uvm.h>
94:
1.77 thorpej 95: MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
96: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37 thorpej 97:
1.142 dyoung 98: extern const struct fileops socketops;
99:
1.54 lukem 100: extern int somaxconn; /* patchable (XXX sysctl) */
101: int somaxconn = SOMAXCONN;
1.160 ad 102: kmutex_t *softnet_lock;
1.49 jonathan 103:
1.64 thorpej 104: #ifdef SOSEND_COUNTERS
105: #include <sys/device.h>
106:
1.113 thorpej 107: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 108: NULL, "sosend", "loan big");
1.113 thorpej 109: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 110: NULL, "sosend", "copy big");
1.113 thorpej 111: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 112: NULL, "sosend", "copy small");
1.113 thorpej 113: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 114: NULL, "sosend", "kva limit");
115:
116: #define SOSEND_COUNTER_INCR(ev) (ev)->ev_count++
117:
1.101 matt 118: EVCNT_ATTACH_STATIC(sosend_loan_big);
119: EVCNT_ATTACH_STATIC(sosend_copy_big);
120: EVCNT_ATTACH_STATIC(sosend_copy_small);
121: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64 thorpej 122: #else
123:
124: #define SOSEND_COUNTER_INCR(ev) /* nothing */
125:
126: #endif /* SOSEND_COUNTERS */
127:
1.119 yamt 128: static struct callback_entry sokva_reclaimerentry;
1.1 cgd 129:
1.71 thorpej 130: #ifdef SOSEND_NO_LOAN
1.121 yamt 131: int sock_loan_thresh = -1;
1.71 thorpej 132: #else
1.121 yamt 133: int sock_loan_thresh = 4096;
1.65 thorpej 134: #endif
1.64 thorpej 135:
1.136 ad 136: static kmutex_t so_pendfree_lock;
1.113 thorpej 137: static struct mbuf *so_pendfree;
1.64 thorpej 138:
1.84 ragge 139: #ifndef SOMAXKVA
140: #define SOMAXKVA (16 * 1024 * 1024)
141: #endif
142: int somaxkva = SOMAXKVA;
1.113 thorpej 143: static int socurkva;
1.136 ad 144: static kcondvar_t socurkva_cv;
1.64 thorpej 145:
146: #define SOCK_LOAN_CHUNK 65536
147:
1.117 yamt 148: static size_t sodopendfree(void);
149: static size_t sodopendfreel(void);
1.93 yamt 150:
1.113 thorpej 151: static vsize_t
1.129 yamt 152: sokvareserve(struct socket *so, vsize_t len)
1.80 yamt 153: {
1.98 christos 154: int error;
1.80 yamt 155:
1.136 ad 156: mutex_enter(&so_pendfree_lock);
1.80 yamt 157: while (socurkva + len > somaxkva) {
1.93 yamt 158: size_t freed;
159:
160: /*
161: * try to do pendfree.
162: */
163:
1.117 yamt 164: freed = sodopendfreel();
1.93 yamt 165:
166: /*
167: * if some kva was freed, try again.
168: */
169:
170: if (freed)
1.80 yamt 171: continue;
1.93 yamt 172:
1.80 yamt 173: SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136 ad 174: error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98 christos 175: if (error) {
176: len = 0;
177: break;
178: }
1.80 yamt 179: }
1.93 yamt 180: socurkva += len;
1.136 ad 181: mutex_exit(&so_pendfree_lock);
1.98 christos 182: return len;
1.95 yamt 183: }
184:
1.113 thorpej 185: static void
1.95 yamt 186: sokvaunreserve(vsize_t len)
187: {
188:
1.136 ad 189: mutex_enter(&so_pendfree_lock);
1.95 yamt 190: socurkva -= len;
1.136 ad 191: cv_broadcast(&socurkva_cv);
192: mutex_exit(&so_pendfree_lock);
1.95 yamt 193: }
194:
195: /*
196: * sokvaalloc: allocate kva for loan.
197: */
198:
199: vaddr_t
200: sokvaalloc(vsize_t len, struct socket *so)
201: {
202: vaddr_t lva;
203:
204: /*
205: * reserve kva.
206: */
207:
1.98 christos 208: if (sokvareserve(so, len) == 0)
209: return 0;
1.93 yamt 210:
211: /*
212: * allocate kva.
213: */
1.80 yamt 214:
1.109 yamt 215: lva = uvm_km_alloc(kernel_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95 yamt 216: if (lva == 0) {
217: sokvaunreserve(len);
1.80 yamt 218: return (0);
1.95 yamt 219: }
1.80 yamt 220:
221: return lva;
222: }
223:
1.93 yamt 224: /*
225: * sokvafree: free kva for loan.
226: */
227:
1.80 yamt 228: void
229: sokvafree(vaddr_t sva, vsize_t len)
230: {
1.93 yamt 231:
232: /*
233: * free kva.
234: */
1.80 yamt 235:
1.109 yamt 236: uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93 yamt 237:
238: /*
239: * unreserve kva.
240: */
241:
1.95 yamt 242: sokvaunreserve(len);
1.80 yamt 243: }
244:
1.64 thorpej 245: static void
1.134 christos 246: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64 thorpej 247: {
1.156 yamt 248: vaddr_t sva, eva;
1.64 thorpej 249: vsize_t len;
1.156 yamt 250: int npgs;
251:
252: KASSERT(pgs != NULL);
1.64 thorpej 253:
254: eva = round_page((vaddr_t) buf + size);
255: sva = trunc_page((vaddr_t) buf);
256: len = eva - sva;
257: npgs = len >> PAGE_SHIFT;
258:
259: pmap_kremove(sva, len);
260: pmap_update(pmap_kernel());
261: uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80 yamt 262: sokvafree(sva, len);
1.64 thorpej 263: }
264:
265: static size_t
1.152 matt 266: sodopendfree(void)
1.64 thorpej 267: {
1.93 yamt 268: size_t rv;
1.64 thorpej 269:
1.160 ad 270: if (__predict_true(so_pendfree == NULL))
271: return 0;
272:
1.136 ad 273: mutex_enter(&so_pendfree_lock);
1.117 yamt 274: rv = sodopendfreel();
1.136 ad 275: mutex_exit(&so_pendfree_lock);
1.93 yamt 276:
277: return rv;
278: }
279:
280: /*
281: * sodopendfreel: free mbufs on "pendfree" list.
1.136 ad 282: * unlock and relock so_pendfree_lock when freeing mbufs.
1.93 yamt 283: *
1.136 ad 284: * => called with so_pendfree_lock held.
1.93 yamt 285: */
286:
287: static size_t
1.152 matt 288: sodopendfreel(void)
1.93 yamt 289: {
1.137 ad 290: struct mbuf *m, *next;
1.93 yamt 291: size_t rv = 0;
292:
1.136 ad 293: KASSERT(mutex_owned(&so_pendfree_lock));
1.64 thorpej 294:
1.137 ad 295: while (so_pendfree != NULL) {
1.64 thorpej 296: m = so_pendfree;
1.93 yamt 297: so_pendfree = NULL;
1.136 ad 298: mutex_exit(&so_pendfree_lock);
1.93 yamt 299:
300: for (; m != NULL; m = next) {
301: next = m->m_next;
1.156 yamt 302: KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
303: KASSERT(m->m_ext.ext_refcnt == 0);
1.93 yamt 304:
305: rv += m->m_ext.ext_size;
1.156 yamt 306: sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
1.93 yamt 307: m->m_ext.ext_size);
1.145 ad 308: pool_cache_put(mb_cache, m);
1.93 yamt 309: }
1.64 thorpej 310:
1.136 ad 311: mutex_enter(&so_pendfree_lock);
1.64 thorpej 312: }
313:
314: return (rv);
315: }
316:
1.80 yamt 317: void
1.134 christos 318: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64 thorpej 319: {
320:
1.156 yamt 321: KASSERT(m != NULL);
1.64 thorpej 322:
1.93 yamt 323: /*
324: * postpone freeing mbuf.
325: *
326: * we can't do it in interrupt context
327: * because we need to put kva back to kernel_map.
328: */
329:
1.136 ad 330: mutex_enter(&so_pendfree_lock);
1.92 yamt 331: m->m_next = so_pendfree;
332: so_pendfree = m;
1.136 ad 333: cv_broadcast(&socurkva_cv);
334: mutex_exit(&so_pendfree_lock);
1.64 thorpej 335: }
336:
337: static long
338: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
339: {
340: struct iovec *iov = uio->uio_iov;
341: vaddr_t sva, eva;
342: vsize_t len;
1.156 yamt 343: vaddr_t lva;
344: int npgs, error;
345: vaddr_t va;
346: int i;
1.64 thorpej 347:
1.116 yamt 348: if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64 thorpej 349: return (0);
350:
351: if (iov->iov_len < (size_t) space)
352: space = iov->iov_len;
353: if (space > SOCK_LOAN_CHUNK)
354: space = SOCK_LOAN_CHUNK;
355:
356: eva = round_page((vaddr_t) iov->iov_base + space);
357: sva = trunc_page((vaddr_t) iov->iov_base);
358: len = eva - sva;
359: npgs = len >> PAGE_SHIFT;
360:
1.79 thorpej 361: KASSERT(npgs <= M_EXT_MAXPAGES);
362:
1.80 yamt 363: lva = sokvaalloc(len, so);
1.64 thorpej 364: if (lva == 0)
1.80 yamt 365: return 0;
1.64 thorpej 366:
1.116 yamt 367: error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79 thorpej 368: m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64 thorpej 369: if (error) {
1.80 yamt 370: sokvafree(lva, len);
1.64 thorpej 371: return (0);
372: }
373:
374: for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79 thorpej 375: pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
376: VM_PROT_READ);
1.64 thorpej 377: pmap_update(pmap_kernel());
378:
379: lva += (vaddr_t) iov->iov_base & PAGE_MASK;
380:
1.134 christos 381: MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79 thorpej 382: m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64 thorpej 383:
384: uio->uio_resid -= space;
385: /* uio_offset not updated, not set/used for write(2) */
1.134 christos 386: uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64 thorpej 387: uio->uio_iov->iov_len -= space;
388: if (uio->uio_iov->iov_len == 0) {
389: uio->uio_iov++;
390: uio->uio_iovcnt--;
391: }
392:
393: return (space);
394: }
395:
1.119 yamt 396: static int
1.129 yamt 397: sokva_reclaim_callback(struct callback_entry *ce, void *obj, void *arg)
1.119 yamt 398: {
399:
400: KASSERT(ce == &sokva_reclaimerentry);
401: KASSERT(obj == NULL);
402:
403: sodopendfree();
404: if (!vm_map_starved_p(kernel_map)) {
405: return CALLBACK_CHAIN_ABORT;
406: }
407: return CALLBACK_CHAIN_CONTINUE;
408: }
409:
1.142 dyoung 410: struct mbuf *
1.147 dyoung 411: getsombuf(struct socket *so, int type)
1.142 dyoung 412: {
413: struct mbuf *m;
414:
1.147 dyoung 415: m = m_get(M_WAIT, type);
1.142 dyoung 416: MCLAIM(m, so->so_mowner);
417: return m;
418: }
419:
420: struct mbuf *
421: m_intopt(struct socket *so, int val)
422: {
423: struct mbuf *m;
424:
1.147 dyoung 425: m = getsombuf(so, MT_SOOPTS);
1.142 dyoung 426: m->m_len = sizeof(int);
427: *mtod(m, int *) = val;
428: return m;
429: }
430:
1.119 yamt 431: void
432: soinit(void)
433: {
434:
1.148 ad 435: mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160 ad 436: softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136 ad 437: cv_init(&socurkva_cv, "sokva");
438:
1.119 yamt 439: /* Set the initial adjusted socket buffer size. */
440: if (sb_max_set(sb_max))
441: panic("bad initial sb_max value: %lu", sb_max);
442:
443: callback_register(&vm_map_to_kernel(kernel_map)->vmk_reclaim_callback,
444: &sokva_reclaimerentry, NULL, sokva_reclaim_callback);
445: }
446:
1.1 cgd 447: /*
448: * Socket operation routines.
449: * These routines are called by the routines in
450: * sys_socket.c or from a system process, and
451: * implement the semantics of socket operations by
452: * switching out to the protocol specific routines.
453: */
454: /*ARGSUSED*/
1.3 andrew 455: int
1.160 ad 456: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
457: struct socket *lockso)
1.1 cgd 458: {
1.99 matt 459: const struct protosw *prp;
1.54 lukem 460: struct socket *so;
1.115 yamt 461: uid_t uid;
1.160 ad 462: int error;
463: kmutex_t *lock;
1.1 cgd 464:
1.132 elad 465: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
466: KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
467: KAUTH_ARG(proto));
1.140 dyoung 468: if (error != 0)
469: return error;
1.127 elad 470:
1.1 cgd 471: if (proto)
472: prp = pffindproto(dom, proto, type);
473: else
474: prp = pffindtype(dom, type);
1.140 dyoung 475: if (prp == NULL) {
1.120 ginsbach 476: /* no support for domain */
477: if (pffinddomain(dom) == 0)
1.140 dyoung 478: return EAFNOSUPPORT;
1.120 ginsbach 479: /* no support for socket type */
480: if (proto == 0 && type != 0)
1.140 dyoung 481: return EPROTOTYPE;
482: return EPROTONOSUPPORT;
1.120 ginsbach 483: }
1.140 dyoung 484: if (prp->pr_usrreq == NULL)
485: return EPROTONOSUPPORT;
1.1 cgd 486: if (prp->pr_type != type)
1.140 dyoung 487: return EPROTOTYPE;
1.160 ad 488:
489: so = soget(true);
1.1 cgd 490: so->so_type = type;
491: so->so_proto = prp;
1.33 matt 492: so->so_send = sosend;
493: so->so_receive = soreceive;
1.78 matt 494: #ifdef MBUFTRACE
495: so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
496: so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
497: so->so_mowner = &prp->pr_domain->dom_mowner;
498: #endif
1.138 rmind 499: uid = kauth_cred_geteuid(l->l_cred);
1.115 yamt 500: so->so_uidinfo = uid_find(uid);
1.160 ad 501: if (lockso != NULL) {
502: /* Caller wants us to share a lock. */
503: lock = lockso->so_lock;
504: so->so_lock = lock;
505: mutex_obj_hold(lock);
506: mutex_enter(lock);
507: } else {
508: /* Lock assigned and taken during PRU_ATTACH. */
509: }
1.140 dyoung 510: error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
511: (struct mbuf *)(long)proto, NULL, l);
1.160 ad 512: KASSERT(solocked(so));
1.140 dyoung 513: if (error != 0) {
1.1 cgd 514: so->so_state |= SS_NOFDREF;
515: sofree(so);
1.140 dyoung 516: return error;
1.1 cgd 517: }
1.160 ad 518: sounlock(so);
1.1 cgd 519: *aso = so;
1.140 dyoung 520: return 0;
1.1 cgd 521: }
522:
1.142 dyoung 523: /* On success, write file descriptor to fdout and return zero. On
524: * failure, return non-zero; *fdout will be undefined.
525: */
526: int
527: fsocreate(int domain, struct socket **sop, int type, int protocol,
528: struct lwp *l, int *fdout)
529: {
530: struct socket *so;
531: struct file *fp;
532: int fd, error;
533:
1.155 ad 534: if ((error = fd_allocfile(&fp, &fd)) != 0)
1.142 dyoung 535: return (error);
536: fp->f_flag = FREAD|FWRITE;
537: fp->f_type = DTYPE_SOCKET;
538: fp->f_ops = &socketops;
1.160 ad 539: error = socreate(domain, &so, type, protocol, l, NULL);
1.142 dyoung 540: if (error != 0) {
1.155 ad 541: fd_abort(curproc, fp, fd);
1.142 dyoung 542: } else {
543: if (sop != NULL)
544: *sop = so;
545: fp->f_data = so;
1.155 ad 546: fd_affix(curproc, fp, fd);
1.142 dyoung 547: *fdout = fd;
548: }
549: return error;
550: }
551:
1.3 andrew 552: int
1.114 christos 553: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 554: {
1.160 ad 555: int error;
1.1 cgd 556:
1.160 ad 557: solock(so);
1.140 dyoung 558: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160 ad 559: sounlock(so);
1.140 dyoung 560: return error;
1.1 cgd 561: }
562:
1.3 andrew 563: int
1.150 elad 564: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 565: {
1.160 ad 566: int error;
1.1 cgd 567:
1.160 ad 568: solock(so);
1.158 ad 569: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 570: SS_ISDISCONNECTING)) != 0) {
571: sounlock(so);
1.158 ad 572: return (EOPNOTSUPP);
1.163 ad 573: }
1.140 dyoung 574: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150 elad 575: NULL, NULL, l);
1.140 dyoung 576: if (error != 0) {
1.160 ad 577: sounlock(so);
1.140 dyoung 578: return error;
1.1 cgd 579: }
1.63 matt 580: if (TAILQ_EMPTY(&so->so_q))
1.1 cgd 581: so->so_options |= SO_ACCEPTCONN;
582: if (backlog < 0)
583: backlog = 0;
1.49 jonathan 584: so->so_qlimit = min(backlog, somaxconn);
1.160 ad 585: sounlock(so);
1.140 dyoung 586: return 0;
1.1 cgd 587: }
588:
1.21 christos 589: void
1.54 lukem 590: sofree(struct socket *so)
1.1 cgd 591: {
1.161 ad 592: u_int refs;
1.1 cgd 593:
1.160 ad 594: KASSERT(solocked(so));
595:
596: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
597: sounlock(so);
1.1 cgd 598: return;
1.160 ad 599: }
1.43 mycroft 600: if (so->so_head) {
601: /*
602: * We must not decommission a socket that's on the accept(2)
603: * queue. If we do, then accept(2) may hang after select(2)
604: * indicated that the listening socket was ready.
605: */
1.160 ad 606: if (!soqremque(so, 0)) {
607: sounlock(so);
1.43 mycroft 608: return;
1.160 ad 609: }
1.43 mycroft 610: }
1.98 christos 611: if (so->so_rcv.sb_hiwat)
1.110 christos 612: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 613: RLIM_INFINITY);
614: if (so->so_snd.sb_hiwat)
1.110 christos 615: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 616: RLIM_INFINITY);
617: sbrelease(&so->so_snd, so);
1.160 ad 618: KASSERT(!cv_has_waiters(&so->so_cv));
619: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
620: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 621: sorflush(so);
1.161 ad 622: refs = so->so_aborting; /* XXX */
1.160 ad 623: sounlock(so);
1.161 ad 624: if (refs == 0) /* XXX */
625: soput(so);
1.1 cgd 626: }
627:
628: /*
629: * Close a socket on last file table reference removal.
630: * Initiate disconnect if connected.
631: * Free socket when disconnect complete.
632: */
1.3 andrew 633: int
1.54 lukem 634: soclose(struct socket *so)
1.1 cgd 635: {
1.54 lukem 636: struct socket *so2;
1.160 ad 637: int error;
638: int error2;
1.1 cgd 639:
1.54 lukem 640: error = 0;
1.160 ad 641: solock(so);
1.1 cgd 642: if (so->so_options & SO_ACCEPTCONN) {
1.160 ad 643: do {
644: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
645: KASSERT(solocked2(so, so2));
646: (void) soqremque(so2, 0);
647: /* soabort drops the lock. */
648: (void) soabort(so2);
649: solock(so);
650: continue;
651: }
652: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
653: KASSERT(solocked2(so, so2));
654: (void) soqremque(so2, 1);
655: /* soabort drops the lock. */
656: (void) soabort(so2);
657: solock(so);
658: continue;
659: }
660: } while (0);
1.1 cgd 661: }
662: if (so->so_pcb == 0)
663: goto discard;
664: if (so->so_state & SS_ISCONNECTED) {
665: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
666: error = sodisconnect(so);
667: if (error)
668: goto drop;
669: }
670: if (so->so_options & SO_LINGER) {
1.151 ad 671: if ((so->so_state & SS_ISDISCONNECTING) && so->so_nbio)
1.1 cgd 672: goto drop;
1.21 christos 673: while (so->so_state & SS_ISCONNECTED) {
1.160 ad 674: error = sowait(so, so->so_linger * hz);
1.21 christos 675: if (error)
1.1 cgd 676: break;
1.21 christos 677: }
1.1 cgd 678: }
679: }
1.54 lukem 680: drop:
1.1 cgd 681: if (so->so_pcb) {
1.160 ad 682: error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140 dyoung 683: NULL, NULL, NULL, NULL);
1.1 cgd 684: if (error == 0)
685: error = error2;
686: }
1.54 lukem 687: discard:
1.1 cgd 688: if (so->so_state & SS_NOFDREF)
689: panic("soclose: NOFDREF");
690: so->so_state |= SS_NOFDREF;
691: sofree(so);
692: return (error);
693: }
694:
695: /*
1.160 ad 696: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 697: */
1.3 andrew 698: int
1.54 lukem 699: soabort(struct socket *so)
1.1 cgd 700: {
1.161 ad 701: u_int refs;
1.139 yamt 702: int error;
1.160 ad 703:
704: KASSERT(solocked(so));
705: KASSERT(so->so_head == NULL);
1.1 cgd 706:
1.161 ad 707: so->so_aborting++; /* XXX */
1.140 dyoung 708: error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
709: NULL, NULL, NULL);
1.161 ad 710: refs = --so->so_aborting; /* XXX */
1.164 drochner 711: if (error || (refs == 0)) {
1.139 yamt 712: sofree(so);
1.160 ad 713: } else {
714: sounlock(so);
1.139 yamt 715: }
716: return error;
1.1 cgd 717: }
718:
1.3 andrew 719: int
1.54 lukem 720: soaccept(struct socket *so, struct mbuf *nam)
1.1 cgd 721: {
1.160 ad 722: int error;
723:
724: KASSERT(solocked(so));
1.1 cgd 725:
1.54 lukem 726: error = 0;
1.1 cgd 727: if ((so->so_state & SS_NOFDREF) == 0)
728: panic("soaccept: !NOFDREF");
729: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 730: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
731: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41 mycroft 732: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140 dyoung 733: NULL, nam, NULL, NULL);
1.41 mycroft 734: else
1.53 itojun 735: error = ECONNABORTED;
1.52 itojun 736:
1.1 cgd 737: return (error);
738: }
739:
1.3 andrew 740: int
1.114 christos 741: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 742: {
1.160 ad 743: int error;
744:
745: KASSERT(solocked(so));
1.1 cgd 746:
747: if (so->so_options & SO_ACCEPTCONN)
748: return (EOPNOTSUPP);
749: /*
750: * If protocol is connection-based, can only connect once.
751: * Otherwise, if connected, try to disconnect first.
752: * This allows user to disconnect by connecting to, e.g.,
753: * a null address.
754: */
755: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
756: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
757: (error = sodisconnect(so))))
758: error = EISCONN;
759: else
760: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140 dyoung 761: NULL, nam, NULL, l);
1.1 cgd 762: return (error);
763: }
764:
1.3 andrew 765: int
1.54 lukem 766: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 767: {
1.160 ad 768: int error;
769:
770: KASSERT(solocked2(so1, so2));
1.1 cgd 771:
1.22 mycroft 772: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140 dyoung 773: NULL, (struct mbuf *)so2, NULL, NULL);
1.1 cgd 774: return (error);
775: }
776:
1.3 andrew 777: int
1.54 lukem 778: sodisconnect(struct socket *so)
1.1 cgd 779: {
1.160 ad 780: int error;
781:
782: KASSERT(solocked(so));
1.1 cgd 783:
784: if ((so->so_state & SS_ISCONNECTED) == 0) {
785: error = ENOTCONN;
1.160 ad 786: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 787: error = EALREADY;
1.160 ad 788: } else {
789: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
790: NULL, NULL, NULL, NULL);
1.1 cgd 791: }
1.117 yamt 792: sodopendfree();
1.1 cgd 793: return (error);
794: }
795:
1.15 mycroft 796: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 797: /*
798: * Send on a socket.
799: * If send must go all at once and message is larger than
800: * send buffering, then hard error.
801: * Lock against other senders.
802: * If must go all at once and not enough room now, then
803: * inform user that this would block and do nothing.
804: * Otherwise, if nonblocking, send as much as possible.
805: * The data to be sent is described by "uio" if nonzero,
806: * otherwise by the mbuf chain "top" (which must be null
807: * if uio is not). Data provided in mbuf chain must be small
808: * enough to send all at once.
809: *
810: * Returns nonzero on error, timeout or signal; callers
811: * must check for short counts if EINTR/ERESTART are returned.
812: * Data and control buffers are freed on return.
813: */
1.3 andrew 814: int
1.54 lukem 815: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114 christos 816: struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 817: {
1.54 lukem 818: struct mbuf **mp, *m;
1.114 christos 819: struct proc *p;
1.58 jdolecek 820: long space, len, resid, clen, mlen;
821: int error, s, dontroute, atomic;
1.54 lukem 822:
1.114 christos 823: p = l->l_proc;
1.117 yamt 824: sodopendfree();
1.160 ad 825: clen = 0;
1.64 thorpej 826:
1.160 ad 827: /*
828: * solock() provides atomicity of access. splsoftnet() prevents
829: * protocol processing soft interrupts from interrupting us and
830: * blocking (expensive).
831: */
832: s = splsoftnet();
833: solock(so);
1.54 lukem 834: atomic = sosendallatonce(so) || top;
1.1 cgd 835: if (uio)
836: resid = uio->uio_resid;
837: else
838: resid = top->m_pkthdr.len;
1.7 cgd 839: /*
840: * In theory resid should be unsigned.
841: * However, space must be signed, as it might be less than 0
842: * if we over-committed, and we must use a signed comparison
843: * of space and resid. On the other hand, a negative resid
844: * causes us to loop sending 0-length segments to the protocol.
845: */
1.29 mycroft 846: if (resid < 0) {
847: error = EINVAL;
848: goto out;
849: }
1.1 cgd 850: dontroute =
851: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
852: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 ! christos 853: l->l_ru.ru_msgsnd++;
1.1 cgd 854: if (control)
855: clen = control->m_len;
1.54 lukem 856: restart:
1.21 christos 857: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 858: goto out;
859: do {
1.160 ad 860: if (so->so_state & SS_CANTSENDMORE) {
861: error = EPIPE;
862: goto release;
863: }
1.48 thorpej 864: if (so->so_error) {
865: error = so->so_error;
866: so->so_error = 0;
867: goto release;
868: }
1.1 cgd 869: if ((so->so_state & SS_ISCONNECTED) == 0) {
870: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
871: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160 ad 872: !(resid == 0 && clen != 0)) {
873: error = ENOTCONN;
874: goto release;
875: }
876: } else if (addr == 0) {
877: error = EDESTADDRREQ;
878: goto release;
879: }
1.1 cgd 880: }
881: space = sbspace(&so->so_snd);
882: if (flags & MSG_OOB)
883: space += 1024;
1.21 christos 884: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 885: clen > so->so_snd.sb_hiwat) {
886: error = EMSGSIZE;
887: goto release;
888: }
1.96 mycroft 889: if (space < resid + clen &&
1.1 cgd 890: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.160 ad 891: if (so->so_nbio) {
892: error = EWOULDBLOCK;
893: goto release;
894: }
1.1 cgd 895: sbunlock(&so->so_snd);
896: error = sbwait(&so->so_snd);
897: if (error)
898: goto out;
899: goto restart;
900: }
901: mp = ⊤
902: space -= clen;
903: do {
1.45 tv 904: if (uio == NULL) {
905: /*
906: * Data is prepackaged in "top".
907: */
908: resid = 0;
909: if (flags & MSG_EOR)
910: top->m_flags |= M_EOR;
911: } else do {
1.160 ad 912: sounlock(so);
913: splx(s);
1.144 dyoung 914: if (top == NULL) {
1.78 matt 915: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 916: mlen = MHLEN;
917: m->m_pkthdr.len = 0;
1.140 dyoung 918: m->m_pkthdr.rcvif = NULL;
1.45 tv 919: } else {
1.78 matt 920: m = m_get(M_WAIT, MT_DATA);
1.45 tv 921: mlen = MLEN;
922: }
1.78 matt 923: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 924: if (sock_loan_thresh >= 0 &&
925: uio->uio_iov->iov_len >= sock_loan_thresh &&
926: space >= sock_loan_thresh &&
1.64 thorpej 927: (len = sosend_loan(so, uio, m,
928: space)) != 0) {
929: SOSEND_COUNTER_INCR(&sosend_loan_big);
930: space -= len;
931: goto have_data;
932: }
1.45 tv 933: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 934: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.78 matt 935: m_clget(m, M_WAIT);
1.45 tv 936: if ((m->m_flags & M_EXT) == 0)
937: goto nopages;
938: mlen = MCLBYTES;
939: if (atomic && top == 0) {
1.58 jdolecek 940: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 941: resid);
1.45 tv 942: m->m_data += max_hdr;
943: } else
1.58 jdolecek 944: len = lmin(MCLBYTES, resid);
1.45 tv 945: space -= len;
946: } else {
1.64 thorpej 947: nopages:
948: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 949: len = lmin(lmin(mlen, resid), space);
1.45 tv 950: space -= len;
951: /*
952: * For datagram protocols, leave room
953: * for protocol headers in first mbuf.
954: */
955: if (atomic && top == 0 && len < mlen)
956: MH_ALIGN(m, len);
957: }
1.144 dyoung 958: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 959: have_data:
1.45 tv 960: resid = uio->uio_resid;
961: m->m_len = len;
962: *mp = m;
963: top->m_pkthdr.len += len;
1.160 ad 964: s = splsoftnet();
965: solock(so);
1.144 dyoung 966: if (error != 0)
1.45 tv 967: goto release;
968: mp = &m->m_next;
969: if (resid <= 0) {
970: if (flags & MSG_EOR)
971: top->m_flags |= M_EOR;
972: break;
973: }
974: } while (space > 0 && atomic);
1.108 perry 975:
1.160 ad 976: if (so->so_state & SS_CANTSENDMORE) {
977: error = EPIPE;
978: goto release;
979: }
1.45 tv 980: if (dontroute)
981: so->so_options |= SO_DONTROUTE;
982: if (resid > 0)
983: so->so_state |= SS_MORETOCOME;
1.46 sommerfe 984: error = (*so->so_proto->pr_usrreq)(so,
985: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160 ad 986: top, addr, control, curlwp);
1.45 tv 987: if (dontroute)
988: so->so_options &= ~SO_DONTROUTE;
989: if (resid > 0)
990: so->so_state &= ~SS_MORETOCOME;
991: clen = 0;
1.144 dyoung 992: control = NULL;
993: top = NULL;
1.45 tv 994: mp = ⊤
1.144 dyoung 995: if (error != 0)
1.1 cgd 996: goto release;
997: } while (resid && space > 0);
998: } while (resid);
999:
1.54 lukem 1000: release:
1.1 cgd 1001: sbunlock(&so->so_snd);
1.54 lukem 1002: out:
1.160 ad 1003: sounlock(so);
1004: splx(s);
1.1 cgd 1005: if (top)
1006: m_freem(top);
1007: if (control)
1008: m_freem(control);
1009: return (error);
1010: }
1011:
1012: /*
1.159 ad 1013: * Following replacement or removal of the first mbuf on the first
1014: * mbuf chain of a socket buffer, push necessary state changes back
1015: * into the socket buffer so that other consumers see the values
1016: * consistently. 'nextrecord' is the callers locally stored value of
1017: * the original value of sb->sb_mb->m_nextpkt which must be restored
1018: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1019: */
1020: static void
1021: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1022: {
1023:
1.160 ad 1024: KASSERT(solocked(sb->sb_so));
1025:
1.159 ad 1026: /*
1027: * First, update for the new value of nextrecord. If necessary,
1028: * make it the first record.
1029: */
1030: if (sb->sb_mb != NULL)
1031: sb->sb_mb->m_nextpkt = nextrecord;
1032: else
1033: sb->sb_mb = nextrecord;
1034:
1035: /*
1036: * Now update any dependent socket buffer fields to reflect
1037: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1038: * the addition of a second clause that takes care of the
1039: * case where sb_mb has been updated, but remains the last
1040: * record.
1041: */
1042: if (sb->sb_mb == NULL) {
1043: sb->sb_mbtail = NULL;
1044: sb->sb_lastrecord = NULL;
1045: } else if (sb->sb_mb->m_nextpkt == NULL)
1046: sb->sb_lastrecord = sb->sb_mb;
1047: }
1048:
1049: /*
1.1 cgd 1050: * Implement receive operations on a socket.
1051: * We depend on the way that records are added to the sockbuf
1052: * by sbappend*. In particular, each record (mbufs linked through m_next)
1053: * must begin with an address if the protocol so specifies,
1054: * followed by an optional mbuf or mbufs containing ancillary data,
1055: * and then zero or more mbufs of data.
1056: * In order to avoid blocking network interrupts for the entire time here,
1057: * we splx() while doing the actual copy to user space.
1058: * Although the sockbuf is locked, new data may still be appended,
1059: * and thus we must maintain consistency of the sockbuf during that time.
1060: *
1061: * The caller may receive the data as a single mbuf chain by supplying
1062: * an mbuf **mp0 for use in returning the chain. The uio is then used
1063: * only for the count in uio_resid.
1064: */
1.3 andrew 1065: int
1.54 lukem 1066: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1067: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1068: {
1.116 yamt 1069: struct lwp *l = curlwp;
1.160 ad 1070: struct mbuf *m, **mp, *mt;
1.146 dyoung 1071: int atomic, flags, len, error, s, offset, moff, type, orig_resid;
1.99 matt 1072: const struct protosw *pr;
1.54 lukem 1073: struct mbuf *nextrecord;
1.67 he 1074: int mbuf_removed = 0;
1.146 dyoung 1075: const struct domain *dom;
1.64 thorpej 1076:
1.54 lukem 1077: pr = so->so_proto;
1.146 dyoung 1078: atomic = pr->pr_flags & PR_ATOMIC;
1079: dom = pr->pr_domain;
1.1 cgd 1080: mp = mp0;
1.54 lukem 1081: type = 0;
1082: orig_resid = uio->uio_resid;
1.102 jonathan 1083:
1.144 dyoung 1084: if (paddr != NULL)
1085: *paddr = NULL;
1086: if (controlp != NULL)
1087: *controlp = NULL;
1088: if (flagsp != NULL)
1.1 cgd 1089: flags = *flagsp &~ MSG_EOR;
1090: else
1091: flags = 0;
1.66 enami 1092:
1093: if ((flags & MSG_DONTWAIT) == 0)
1.117 yamt 1094: sodopendfree();
1.66 enami 1095:
1.1 cgd 1096: if (flags & MSG_OOB) {
1097: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1098: solock(so);
1.17 cgd 1099: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140 dyoung 1100: (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160 ad 1101: sounlock(so);
1.1 cgd 1102: if (error)
1103: goto bad;
1104: do {
1.134 christos 1105: error = uiomove(mtod(m, void *),
1.1 cgd 1106: (int) min(uio->uio_resid, m->m_len), uio);
1107: m = m_free(m);
1.144 dyoung 1108: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1109: bad:
1.144 dyoung 1110: if (m != NULL)
1.1 cgd 1111: m_freem(m);
1.144 dyoung 1112: return error;
1.1 cgd 1113: }
1.144 dyoung 1114: if (mp != NULL)
1.140 dyoung 1115: *mp = NULL;
1.160 ad 1116:
1117: /*
1118: * solock() provides atomicity of access. splsoftnet() prevents
1119: * protocol processing soft interrupts from interrupting us and
1120: * blocking (expensive).
1121: */
1122: s = splsoftnet();
1123: solock(so);
1.1 cgd 1124: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140 dyoung 1125: (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1 cgd 1126:
1.54 lukem 1127: restart:
1.160 ad 1128: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1129: sounlock(so);
1130: splx(s);
1.144 dyoung 1131: return error;
1.160 ad 1132: }
1.1 cgd 1133:
1134: m = so->so_rcv.sb_mb;
1135: /*
1136: * If we have less data than requested, block awaiting more
1137: * (subject to any timeout) if:
1.15 mycroft 1138: * 1. the current count is less than the low water mark,
1.1 cgd 1139: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1140: * receive operation at once if we block (resid <= hiwat), or
1141: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1142: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1143: * we have to do the receive in sections, and thus risk returning
1144: * a short count if a timeout or signal occurs after we start.
1145: */
1.144 dyoung 1146: if (m == NULL ||
1147: ((flags & MSG_DONTWAIT) == 0 &&
1148: so->so_rcv.sb_cc < uio->uio_resid &&
1149: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1150: ((flags & MSG_WAITALL) &&
1151: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1152: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1153: #ifdef DIAGNOSTIC
1.144 dyoung 1154: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1155: panic("receive 1");
1156: #endif
1157: if (so->so_error) {
1.144 dyoung 1158: if (m != NULL)
1.15 mycroft 1159: goto dontblock;
1.1 cgd 1160: error = so->so_error;
1161: if ((flags & MSG_PEEK) == 0)
1162: so->so_error = 0;
1163: goto release;
1164: }
1165: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1166: if (m != NULL)
1.15 mycroft 1167: goto dontblock;
1.1 cgd 1168: else
1169: goto release;
1170: }
1.144 dyoung 1171: for (; m != NULL; m = m->m_next)
1.1 cgd 1172: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1173: m = so->so_rcv.sb_mb;
1174: goto dontblock;
1175: }
1176: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1177: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1178: error = ENOTCONN;
1179: goto release;
1180: }
1181: if (uio->uio_resid == 0)
1182: goto release;
1.151 ad 1183: if (so->so_nbio || (flags & MSG_DONTWAIT)) {
1.1 cgd 1184: error = EWOULDBLOCK;
1185: goto release;
1186: }
1.69 thorpej 1187: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1188: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1189: sbunlock(&so->so_rcv);
1190: error = sbwait(&so->so_rcv);
1.160 ad 1191: if (error != 0) {
1192: sounlock(so);
1193: splx(s);
1.144 dyoung 1194: return error;
1.160 ad 1195: }
1.1 cgd 1196: goto restart;
1197: }
1.54 lukem 1198: dontblock:
1.69 thorpej 1199: /*
1200: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1201: * From this point onward, we maintain 'nextrecord' as a cache of the
1202: * pointer to the next record in the socket buffer. We must keep the
1203: * various socket buffer pointers and local stack versions of the
1204: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1205: * socket lock, and re-reading them when picking it up.
1.159 ad 1206: *
1207: * Otherwise, we will race with the network stack appending new data
1208: * or records onto the socket buffer by using inconsistent/stale
1209: * versions of the field, possibly resulting in socket buffer
1210: * corruption.
1211: *
1212: * By holding the high-level sblock(), we prevent simultaneous
1213: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1214: */
1.144 dyoung 1215: if (l != NULL)
1.157 ad 1216: l->l_ru.ru_msgrcv++;
1.69 thorpej 1217: KASSERT(m == so->so_rcv.sb_mb);
1218: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1219: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1220: nextrecord = m->m_nextpkt;
1221: if (pr->pr_flags & PR_ADDR) {
1222: #ifdef DIAGNOSTIC
1223: if (m->m_type != MT_SONAME)
1224: panic("receive 1a");
1225: #endif
1.3 andrew 1226: orig_resid = 0;
1.1 cgd 1227: if (flags & MSG_PEEK) {
1228: if (paddr)
1229: *paddr = m_copy(m, 0, m->m_len);
1230: m = m->m_next;
1231: } else {
1232: sbfree(&so->so_rcv, m);
1.67 he 1233: mbuf_removed = 1;
1.144 dyoung 1234: if (paddr != NULL) {
1.1 cgd 1235: *paddr = m;
1236: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1237: m->m_next = NULL;
1.1 cgd 1238: m = so->so_rcv.sb_mb;
1239: } else {
1240: MFREE(m, so->so_rcv.sb_mb);
1241: m = so->so_rcv.sb_mb;
1242: }
1.159 ad 1243: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1244: }
1245: }
1.159 ad 1246:
1247: /*
1248: * Process one or more MT_CONTROL mbufs present before any data mbufs
1249: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1250: * just copy the data; if !MSG_PEEK, we call into the protocol to
1251: * perform externalization (or freeing if controlp == NULL).
1252: */
1253: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1254: struct mbuf *cm = NULL, *cmn;
1255: struct mbuf **cme = &cm;
1256:
1257: do {
1258: if (flags & MSG_PEEK) {
1259: if (controlp != NULL) {
1260: *controlp = m_copy(m, 0, m->m_len);
1261: controlp = &(*controlp)->m_next;
1262: }
1263: m = m->m_next;
1264: } else {
1265: sbfree(&so->so_rcv, m);
1.1 cgd 1266: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1267: m->m_next = NULL;
1.159 ad 1268: *cme = m;
1269: cme = &(*cme)->m_next;
1.1 cgd 1270: m = so->so_rcv.sb_mb;
1.159 ad 1271: }
1272: } while (m != NULL && m->m_type == MT_CONTROL);
1273: if ((flags & MSG_PEEK) == 0)
1274: sbsync(&so->so_rcv, nextrecord);
1275: for (; cm != NULL; cm = cmn) {
1276: cmn = cm->m_next;
1277: cm->m_next = NULL;
1278: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1279: if (controlp != NULL) {
1280: if (dom->dom_externalize != NULL &&
1281: type == SCM_RIGHTS) {
1.160 ad 1282: sounlock(so);
1.159 ad 1283: splx(s);
1284: error = (*dom->dom_externalize)(cm, l);
1285: s = splsoftnet();
1.160 ad 1286: solock(so);
1.159 ad 1287: }
1288: *controlp = cm;
1289: while (*controlp != NULL)
1290: controlp = &(*controlp)->m_next;
1.1 cgd 1291: } else {
1.106 itojun 1292: /*
1293: * Dispose of any SCM_RIGHTS message that went
1294: * through the read path rather than recv.
1295: */
1.159 ad 1296: if (dom->dom_dispose != NULL &&
1297: type == SCM_RIGHTS) {
1.160 ad 1298: sounlock(so);
1.159 ad 1299: (*dom->dom_dispose)(cm);
1.160 ad 1300: solock(so);
1.159 ad 1301: }
1302: m_freem(cm);
1.1 cgd 1303: }
1304: }
1.159 ad 1305: if (m != NULL)
1306: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1307: else
1308: nextrecord = so->so_rcv.sb_mb;
1309: orig_resid = 0;
1.1 cgd 1310: }
1.69 thorpej 1311:
1.159 ad 1312: /* If m is non-NULL, we have some data to read. */
1313: if (__predict_true(m != NULL)) {
1.1 cgd 1314: type = m->m_type;
1315: if (type == MT_OOBDATA)
1316: flags |= MSG_OOB;
1317: }
1.69 thorpej 1318: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1319: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1320:
1.1 cgd 1321: moff = 0;
1322: offset = 0;
1.144 dyoung 1323: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1324: if (m->m_type == MT_OOBDATA) {
1325: if (type != MT_OOBDATA)
1326: break;
1327: } else if (type == MT_OOBDATA)
1328: break;
1329: #ifdef DIAGNOSTIC
1330: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1331: panic("receive 3");
1332: #endif
1333: so->so_state &= ~SS_RCVATMARK;
1334: len = uio->uio_resid;
1335: if (so->so_oobmark && len > so->so_oobmark - offset)
1336: len = so->so_oobmark - offset;
1337: if (len > m->m_len - moff)
1338: len = m->m_len - moff;
1339: /*
1340: * If mp is set, just pass back the mbufs.
1341: * Otherwise copy them out via the uio, then free.
1342: * Sockbuf must be consistent here (points to current mbuf,
1343: * it points to next record) when we drop priority;
1344: * we must note any additions to the sockbuf when we
1345: * block interrupts again.
1346: */
1.144 dyoung 1347: if (mp == NULL) {
1.69 thorpej 1348: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1349: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1350: sounlock(so);
1.1 cgd 1351: splx(s);
1.134 christos 1352: error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1.20 mycroft 1353: s = splsoftnet();
1.160 ad 1354: solock(so);
1.144 dyoung 1355: if (error != 0) {
1.67 he 1356: /*
1357: * If any part of the record has been removed
1358: * (such as the MT_SONAME mbuf, which will
1359: * happen when PR_ADDR, and thus also
1360: * PR_ATOMIC, is set), then drop the entire
1361: * record to maintain the atomicity of the
1362: * receive operation.
1363: *
1364: * This avoids a later panic("receive 1a")
1365: * when compiled with DIAGNOSTIC.
1366: */
1.146 dyoung 1367: if (m && mbuf_removed && atomic)
1.67 he 1368: (void) sbdroprecord(&so->so_rcv);
1369:
1.57 jdolecek 1370: goto release;
1.67 he 1371: }
1.1 cgd 1372: } else
1373: uio->uio_resid -= len;
1374: if (len == m->m_len - moff) {
1375: if (m->m_flags & M_EOR)
1376: flags |= MSG_EOR;
1377: if (flags & MSG_PEEK) {
1378: m = m->m_next;
1379: moff = 0;
1380: } else {
1381: nextrecord = m->m_nextpkt;
1382: sbfree(&so->so_rcv, m);
1383: if (mp) {
1384: *mp = m;
1385: mp = &m->m_next;
1386: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1387: *mp = NULL;
1.1 cgd 1388: } else {
1389: MFREE(m, so->so_rcv.sb_mb);
1390: m = so->so_rcv.sb_mb;
1391: }
1.69 thorpej 1392: /*
1393: * If m != NULL, we also know that
1394: * so->so_rcv.sb_mb != NULL.
1395: */
1396: KASSERT(so->so_rcv.sb_mb == m);
1397: if (m) {
1.1 cgd 1398: m->m_nextpkt = nextrecord;
1.69 thorpej 1399: if (nextrecord == NULL)
1400: so->so_rcv.sb_lastrecord = m;
1401: } else {
1402: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1403: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1404: }
1405: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1406: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1407: }
1.144 dyoung 1408: } else if (flags & MSG_PEEK)
1409: moff += len;
1410: else {
1.160 ad 1411: if (mp != NULL) {
1412: mt = m_copym(m, 0, len, M_NOWAIT);
1413: if (__predict_false(mt == NULL)) {
1414: sounlock(so);
1415: mt = m_copym(m, 0, len, M_WAIT);
1416: solock(so);
1417: }
1418: *mp = mt;
1419: }
1.144 dyoung 1420: m->m_data += len;
1421: m->m_len -= len;
1422: so->so_rcv.sb_cc -= len;
1.1 cgd 1423: }
1424: if (so->so_oobmark) {
1425: if ((flags & MSG_PEEK) == 0) {
1426: so->so_oobmark -= len;
1427: if (so->so_oobmark == 0) {
1428: so->so_state |= SS_RCVATMARK;
1429: break;
1430: }
1.7 cgd 1431: } else {
1.1 cgd 1432: offset += len;
1.7 cgd 1433: if (offset == so->so_oobmark)
1434: break;
1435: }
1.1 cgd 1436: }
1437: if (flags & MSG_EOR)
1438: break;
1439: /*
1440: * If the MSG_WAITALL flag is set (for non-atomic socket),
1441: * we must not quit until "uio->uio_resid == 0" or an error
1442: * termination. If a signal/timeout occurs, return
1443: * with a short count but without error.
1444: * Keep sockbuf locked against other readers.
1445: */
1.144 dyoung 1446: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1447: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1448: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1449: break;
1.68 matt 1450: /*
1451: * If we are peeking and the socket receive buffer is
1452: * full, stop since we can't get more data to peek at.
1453: */
1454: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1455: break;
1456: /*
1457: * If we've drained the socket buffer, tell the
1458: * protocol in case it needs to do something to
1459: * get it filled again.
1460: */
1461: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1462: (*pr->pr_usrreq)(so, PRU_RCVD,
1.140 dyoung 1463: NULL, (struct mbuf *)(long)flags, NULL, l);
1.69 thorpej 1464: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1465: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.1 cgd 1466: error = sbwait(&so->so_rcv);
1.144 dyoung 1467: if (error != 0) {
1.1 cgd 1468: sbunlock(&so->so_rcv);
1.160 ad 1469: sounlock(so);
1.1 cgd 1470: splx(s);
1.144 dyoung 1471: return 0;
1.1 cgd 1472: }
1.21 christos 1473: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1474: nextrecord = m->m_nextpkt;
1475: }
1476: }
1.3 andrew 1477:
1.146 dyoung 1478: if (m && atomic) {
1.3 andrew 1479: flags |= MSG_TRUNC;
1480: if ((flags & MSG_PEEK) == 0)
1481: (void) sbdroprecord(&so->so_rcv);
1482: }
1.1 cgd 1483: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1484: if (m == NULL) {
1.69 thorpej 1485: /*
1.70 thorpej 1486: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1487: * part makes sure sb_lastrecord is up-to-date if
1488: * there is still data in the socket buffer.
1489: */
1.1 cgd 1490: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1491: if (so->so_rcv.sb_mb == NULL) {
1492: so->so_rcv.sb_mbtail = NULL;
1493: so->so_rcv.sb_lastrecord = NULL;
1494: } else if (nextrecord->m_nextpkt == NULL)
1495: so->so_rcv.sb_lastrecord = nextrecord;
1496: }
1497: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1498: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1499: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140 dyoung 1500: (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
1501: (struct mbuf *)(long)flags, NULL, l);
1.1 cgd 1502: }
1.3 andrew 1503: if (orig_resid == uio->uio_resid && orig_resid &&
1504: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1505: sbunlock(&so->so_rcv);
1506: goto restart;
1507: }
1.108 perry 1508:
1.144 dyoung 1509: if (flagsp != NULL)
1.1 cgd 1510: *flagsp |= flags;
1.54 lukem 1511: release:
1.1 cgd 1512: sbunlock(&so->so_rcv);
1.160 ad 1513: sounlock(so);
1.1 cgd 1514: splx(s);
1.144 dyoung 1515: return error;
1.1 cgd 1516: }
1517:
1.14 mycroft 1518: int
1.54 lukem 1519: soshutdown(struct socket *so, int how)
1.1 cgd 1520: {
1.99 matt 1521: const struct protosw *pr;
1.160 ad 1522: int error;
1523:
1524: KASSERT(solocked(so));
1.34 kleink 1525:
1.54 lukem 1526: pr = so->so_proto;
1.34 kleink 1527: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1528: return (EINVAL);
1.1 cgd 1529:
1.160 ad 1530: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1531: sorflush(so);
1.160 ad 1532: error = 0;
1533: }
1.34 kleink 1534: if (how == SHUT_WR || how == SHUT_RDWR)
1.160 ad 1535: error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140 dyoung 1536: NULL, NULL, NULL);
1.160 ad 1537:
1538: return error;
1.1 cgd 1539: }
1540:
1.14 mycroft 1541: void
1.54 lukem 1542: sorflush(struct socket *so)
1.1 cgd 1543: {
1.54 lukem 1544: struct sockbuf *sb, asb;
1.99 matt 1545: const struct protosw *pr;
1.160 ad 1546:
1547: KASSERT(solocked(so));
1.1 cgd 1548:
1.54 lukem 1549: sb = &so->so_rcv;
1550: pr = so->so_proto;
1.160 ad 1551: socantrcvmore(so);
1.1 cgd 1552: sb->sb_flags |= SB_NOINTR;
1.160 ad 1553: (void )sblock(sb, M_WAITOK);
1.1 cgd 1554: sbunlock(sb);
1555: asb = *sb;
1.86 wrstuden 1556: /*
1557: * Clear most of the sockbuf structure, but leave some of the
1558: * fields valid.
1559: */
1560: memset(&sb->sb_startzero, 0,
1561: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1562: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1563: sounlock(so);
1.1 cgd 1564: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1565: solock(so);
1566: }
1.98 christos 1567: sbrelease(&asb, so);
1.1 cgd 1568: }
1569:
1.142 dyoung 1570: static int
1571: sosetopt1(struct socket *so, int level, int optname, struct mbuf *m)
1.1 cgd 1572: {
1.142 dyoung 1573: int optval, val;
1.130 christos 1574: struct linger *l;
1.141 yamt 1575: struct sockbuf *sb;
1.142 dyoung 1576: struct timeval *tv;
1577:
1578: switch (optname) {
1579:
1580: case SO_LINGER:
1581: if (m == NULL || m->m_len != sizeof(struct linger))
1582: return EINVAL;
1583: l = mtod(m, struct linger *);
1584: if (l->l_linger < 0 || l->l_linger > USHRT_MAX ||
1585: l->l_linger > (INT_MAX / hz))
1586: return EDOM;
1587: so->so_linger = l->l_linger;
1588: if (l->l_onoff)
1589: so->so_options |= SO_LINGER;
1590: else
1591: so->so_options &= ~SO_LINGER;
1592: break;
1.1 cgd 1593:
1.142 dyoung 1594: case SO_DEBUG:
1595: case SO_KEEPALIVE:
1596: case SO_DONTROUTE:
1597: case SO_USELOOPBACK:
1598: case SO_BROADCAST:
1599: case SO_REUSEADDR:
1600: case SO_REUSEPORT:
1601: case SO_OOBINLINE:
1602: case SO_TIMESTAMP:
1603: if (m == NULL || m->m_len < sizeof(int))
1604: return EINVAL;
1605: if (*mtod(m, int *))
1606: so->so_options |= optname;
1607: else
1608: so->so_options &= ~optname;
1609: break;
1610:
1611: case SO_SNDBUF:
1612: case SO_RCVBUF:
1613: case SO_SNDLOWAT:
1614: case SO_RCVLOWAT:
1615: if (m == NULL || m->m_len < sizeof(int))
1616: return EINVAL;
1.1 cgd 1617:
1.142 dyoung 1618: /*
1619: * Values < 1 make no sense for any of these
1620: * options, so disallow them.
1621: */
1622: optval = *mtod(m, int *);
1623: if (optval < 1)
1624: return EINVAL;
1.1 cgd 1625:
1.142 dyoung 1626: switch (optname) {
1.1 cgd 1627:
1628: case SO_SNDBUF:
1629: case SO_RCVBUF:
1.142 dyoung 1630: sb = (optname == SO_SNDBUF) ?
1631: &so->so_snd : &so->so_rcv;
1632: if (sbreserve(sb, (u_long)optval, so) == 0)
1633: return ENOBUFS;
1634: sb->sb_flags &= ~SB_AUTOSIZE;
1635: break;
1636:
1637: /*
1638: * Make sure the low-water is never greater than
1639: * the high-water.
1640: */
1.1 cgd 1641: case SO_SNDLOWAT:
1.142 dyoung 1642: so->so_snd.sb_lowat =
1643: (optval > so->so_snd.sb_hiwat) ?
1644: so->so_snd.sb_hiwat : optval;
1645: break;
1.1 cgd 1646: case SO_RCVLOWAT:
1.142 dyoung 1647: so->so_rcv.sb_lowat =
1648: (optval > so->so_rcv.sb_hiwat) ?
1649: so->so_rcv.sb_hiwat : optval;
1650: break;
1651: }
1652: break;
1.28 thorpej 1653:
1.142 dyoung 1654: case SO_SNDTIMEO:
1655: case SO_RCVTIMEO:
1656: if (m == NULL || m->m_len < sizeof(*tv))
1657: return EINVAL;
1658: tv = mtod(m, struct timeval *);
1659: if (tv->tv_sec > (INT_MAX - tv->tv_usec / tick) / hz)
1660: return EDOM;
1661: val = tv->tv_sec * hz + tv->tv_usec / tick;
1662: if (val == 0 && tv->tv_usec != 0)
1663: val = 1;
1.28 thorpej 1664:
1.142 dyoung 1665: switch (optname) {
1.28 thorpej 1666:
1.142 dyoung 1667: case SO_SNDTIMEO:
1668: so->so_snd.sb_timeo = val;
1.1 cgd 1669: break;
1670: case SO_RCVTIMEO:
1.142 dyoung 1671: so->so_rcv.sb_timeo = val;
1672: break;
1673: }
1674: break;
1.1 cgd 1675:
1.142 dyoung 1676: default:
1677: return ENOPROTOOPT;
1678: }
1679: return 0;
1680: }
1.1 cgd 1681:
1.142 dyoung 1682: int
1683: sosetopt(struct socket *so, int level, int optname, struct mbuf *m)
1684: {
1685: int error, prerr;
1.1 cgd 1686:
1.160 ad 1687: solock(so);
1.142 dyoung 1688: if (level == SOL_SOCKET)
1689: error = sosetopt1(so, level, optname, m);
1690: else
1691: error = ENOPROTOOPT;
1.1 cgd 1692:
1.142 dyoung 1693: if ((error == 0 || error == ENOPROTOOPT) &&
1694: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1695: /* give the protocol stack a shot */
1696: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, level,
1697: optname, &m);
1698: if (prerr == 0)
1699: error = 0;
1700: else if (prerr != ENOPROTOOPT)
1701: error = prerr;
1702: } else if (m != NULL)
1703: (void)m_free(m);
1.160 ad 1704: sounlock(so);
1.142 dyoung 1705: return error;
1.1 cgd 1706: }
1707:
1.14 mycroft 1708: int
1.54 lukem 1709: sogetopt(struct socket *so, int level, int optname, struct mbuf **mp)
1.1 cgd 1710: {
1.54 lukem 1711: struct mbuf *m;
1.160 ad 1712: int error;
1.1 cgd 1713:
1.160 ad 1714: solock(so);
1.1 cgd 1715: if (level != SOL_SOCKET) {
1716: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 1717: error = ((*so->so_proto->pr_ctloutput)
1.1 cgd 1718: (PRCO_GETOPT, so, level, optname, mp));
1719: } else
1.160 ad 1720: error = (ENOPROTOOPT);
1.1 cgd 1721: } else {
1722: m = m_get(M_WAIT, MT_SOOPTS);
1.36 perry 1723: m->m_len = sizeof(int);
1.1 cgd 1724:
1725: switch (optname) {
1726:
1727: case SO_LINGER:
1.36 perry 1728: m->m_len = sizeof(struct linger);
1.1 cgd 1729: mtod(m, struct linger *)->l_onoff =
1.131 christos 1730: (so->so_options & SO_LINGER) ? 1 : 0;
1.1 cgd 1731: mtod(m, struct linger *)->l_linger = so->so_linger;
1732: break;
1733:
1734: case SO_USELOOPBACK:
1735: case SO_DONTROUTE:
1736: case SO_DEBUG:
1737: case SO_KEEPALIVE:
1738: case SO_REUSEADDR:
1.15 mycroft 1739: case SO_REUSEPORT:
1.1 cgd 1740: case SO_BROADCAST:
1741: case SO_OOBINLINE:
1.26 thorpej 1742: case SO_TIMESTAMP:
1.131 christos 1743: *mtod(m, int *) = (so->so_options & optname) ? 1 : 0;
1.1 cgd 1744: break;
1745:
1746: case SO_TYPE:
1747: *mtod(m, int *) = so->so_type;
1748: break;
1749:
1750: case SO_ERROR:
1751: *mtod(m, int *) = so->so_error;
1752: so->so_error = 0;
1753: break;
1754:
1755: case SO_SNDBUF:
1756: *mtod(m, int *) = so->so_snd.sb_hiwat;
1757: break;
1758:
1759: case SO_RCVBUF:
1760: *mtod(m, int *) = so->so_rcv.sb_hiwat;
1761: break;
1762:
1763: case SO_SNDLOWAT:
1764: *mtod(m, int *) = so->so_snd.sb_lowat;
1765: break;
1766:
1767: case SO_RCVLOWAT:
1768: *mtod(m, int *) = so->so_rcv.sb_lowat;
1769: break;
1770:
1771: case SO_SNDTIMEO:
1772: case SO_RCVTIMEO:
1773: {
1774: int val = (optname == SO_SNDTIMEO ?
1775: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1776:
1777: m->m_len = sizeof(struct timeval);
1778: mtod(m, struct timeval *)->tv_sec = val / hz;
1779: mtod(m, struct timeval *)->tv_usec =
1.27 kleink 1780: (val % hz) * tick;
1.1 cgd 1781: break;
1782: }
1783:
1.107 darrenr 1784: case SO_OVERFLOWED:
1785: *mtod(m, int *) = so->so_rcv.sb_overflowed;
1786: break;
1787:
1.1 cgd 1788: default:
1.160 ad 1789: sounlock(so);
1.1 cgd 1790: (void)m_free(m);
1791: return (ENOPROTOOPT);
1792: }
1793: *mp = m;
1.160 ad 1794: error = 0;
1.1 cgd 1795: }
1.160 ad 1796:
1797: sounlock(so);
1798: return (error);
1.1 cgd 1799: }
1800:
1.14 mycroft 1801: void
1.54 lukem 1802: sohasoutofband(struct socket *so)
1.1 cgd 1803: {
1.153 rmind 1804:
1.90 christos 1805: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.153 rmind 1806: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, 0);
1.1 cgd 1807: }
1.72 jdolecek 1808:
1809: static void
1810: filt_sordetach(struct knote *kn)
1811: {
1812: struct socket *so;
1813:
1.155 ad 1814: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 1815: solock(so);
1.73 christos 1816: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
1817: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 1818: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 1819: sounlock(so);
1.72 jdolecek 1820: }
1821:
1822: /*ARGSUSED*/
1823: static int
1.129 yamt 1824: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 1825: {
1826: struct socket *so;
1.160 ad 1827: int rv;
1.72 jdolecek 1828:
1.155 ad 1829: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 1830: if (hint != NOTE_SUBMIT)
1831: solock(so);
1.72 jdolecek 1832: kn->kn_data = so->so_rcv.sb_cc;
1833: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 1834: kn->kn_flags |= EV_EOF;
1.72 jdolecek 1835: kn->kn_fflags = so->so_error;
1.160 ad 1836: rv = 1;
1837: } else if (so->so_error) /* temporary udp error */
1838: rv = 1;
1839: else if (kn->kn_sfflags & NOTE_LOWAT)
1840: rv = (kn->kn_data >= kn->kn_sdata);
1841: else
1842: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
1843: if (hint != NOTE_SUBMIT)
1844: sounlock(so);
1845: return rv;
1.72 jdolecek 1846: }
1847:
1848: static void
1849: filt_sowdetach(struct knote *kn)
1850: {
1851: struct socket *so;
1852:
1.155 ad 1853: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 1854: solock(so);
1.73 christos 1855: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
1856: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 1857: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 1858: sounlock(so);
1.72 jdolecek 1859: }
1860:
1861: /*ARGSUSED*/
1862: static int
1.129 yamt 1863: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 1864: {
1865: struct socket *so;
1.160 ad 1866: int rv;
1.72 jdolecek 1867:
1.155 ad 1868: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 1869: if (hint != NOTE_SUBMIT)
1870: solock(so);
1.72 jdolecek 1871: kn->kn_data = sbspace(&so->so_snd);
1872: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 1873: kn->kn_flags |= EV_EOF;
1.72 jdolecek 1874: kn->kn_fflags = so->so_error;
1.160 ad 1875: rv = 1;
1876: } else if (so->so_error) /* temporary udp error */
1877: rv = 1;
1878: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 1879: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 1880: rv = 0;
1881: else if (kn->kn_sfflags & NOTE_LOWAT)
1882: rv = (kn->kn_data >= kn->kn_sdata);
1883: else
1884: rv = (kn->kn_data >= so->so_snd.sb_lowat);
1885: if (hint != NOTE_SUBMIT)
1886: sounlock(so);
1887: return rv;
1.72 jdolecek 1888: }
1889:
1890: /*ARGSUSED*/
1891: static int
1.129 yamt 1892: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 1893: {
1894: struct socket *so;
1.160 ad 1895: int rv;
1.72 jdolecek 1896:
1.155 ad 1897: so = ((file_t *)kn->kn_obj)->f_data;
1.72 jdolecek 1898:
1899: /*
1900: * Set kn_data to number of incoming connections, not
1901: * counting partial (incomplete) connections.
1.108 perry 1902: */
1.160 ad 1903: if (hint != NOTE_SUBMIT)
1904: solock(so);
1.72 jdolecek 1905: kn->kn_data = so->so_qlen;
1.160 ad 1906: rv = (kn->kn_data > 0);
1907: if (hint != NOTE_SUBMIT)
1908: sounlock(so);
1909: return rv;
1.72 jdolecek 1910: }
1911:
1912: static const struct filterops solisten_filtops =
1913: { 1, NULL, filt_sordetach, filt_solisten };
1914: static const struct filterops soread_filtops =
1915: { 1, NULL, filt_sordetach, filt_soread };
1916: static const struct filterops sowrite_filtops =
1917: { 1, NULL, filt_sowdetach, filt_sowrite };
1918:
1919: int
1.129 yamt 1920: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 1921: {
1922: struct socket *so;
1923: struct sockbuf *sb;
1924:
1.155 ad 1925: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 1926: solock(so);
1.72 jdolecek 1927: switch (kn->kn_filter) {
1928: case EVFILT_READ:
1929: if (so->so_options & SO_ACCEPTCONN)
1930: kn->kn_fop = &solisten_filtops;
1931: else
1932: kn->kn_fop = &soread_filtops;
1933: sb = &so->so_rcv;
1934: break;
1935: case EVFILT_WRITE:
1936: kn->kn_fop = &sowrite_filtops;
1937: sb = &so->so_snd;
1938: break;
1939: default:
1.160 ad 1940: sounlock(so);
1.149 pooka 1941: return (EINVAL);
1.72 jdolecek 1942: }
1.73 christos 1943: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 1944: sb->sb_flags |= SB_KNOTE;
1.160 ad 1945: sounlock(so);
1.72 jdolecek 1946: return (0);
1947: }
1948:
1.154 ad 1949: static int
1950: sodopoll(struct socket *so, int events)
1951: {
1952: int revents;
1953:
1954: revents = 0;
1955:
1956: if (events & (POLLIN | POLLRDNORM))
1957: if (soreadable(so))
1958: revents |= events & (POLLIN | POLLRDNORM);
1959:
1960: if (events & (POLLOUT | POLLWRNORM))
1961: if (sowritable(so))
1962: revents |= events & (POLLOUT | POLLWRNORM);
1963:
1964: if (events & (POLLPRI | POLLRDBAND))
1965: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
1966: revents |= events & (POLLPRI | POLLRDBAND);
1967:
1968: return revents;
1969: }
1970:
1971: int
1972: sopoll(struct socket *so, int events)
1973: {
1974: int revents = 0;
1975:
1.160 ad 1976: #ifndef DIAGNOSTIC
1977: /*
1978: * Do a quick, unlocked check in expectation that the socket
1979: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
1980: * as the solocked() assertions will fail.
1981: */
1.154 ad 1982: if ((revents = sodopoll(so, events)) != 0)
1983: return revents;
1.160 ad 1984: #endif
1.154 ad 1985:
1.160 ad 1986: solock(so);
1.154 ad 1987: if ((revents = sodopoll(so, events)) == 0) {
1988: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
1989: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 1990: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 1991: }
1992:
1993: if (events & (POLLOUT | POLLWRNORM)) {
1994: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 1995: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 1996: }
1997: }
1.160 ad 1998: sounlock(so);
1.154 ad 1999:
2000: return revents;
2001: }
2002:
2003:
1.94 yamt 2004: #include <sys/sysctl.h>
2005:
2006: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
2007:
2008: /*
2009: * sysctl helper routine for kern.somaxkva. ensures that the given
2010: * value is not too small.
2011: * (XXX should we maybe make sure it's not too large as well?)
2012: */
2013: static int
2014: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2015: {
2016: int error, new_somaxkva;
2017: struct sysctlnode node;
2018:
2019: new_somaxkva = somaxkva;
2020: node = *rnode;
2021: node.sysctl_data = &new_somaxkva;
2022: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2023: if (error || newp == NULL)
2024: return (error);
2025:
2026: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2027: return (EINVAL);
2028:
1.136 ad 2029: mutex_enter(&so_pendfree_lock);
1.94 yamt 2030: somaxkva = new_somaxkva;
1.136 ad 2031: cv_broadcast(&socurkva_cv);
2032: mutex_exit(&so_pendfree_lock);
1.94 yamt 2033:
2034: return (error);
2035: }
2036:
2037: SYSCTL_SETUP(sysctl_kern_somaxkva_setup, "sysctl kern.somaxkva setup")
2038: {
2039:
1.97 atatat 2040: sysctl_createv(clog, 0, NULL, NULL,
2041: CTLFLAG_PERMANENT,
2042: CTLTYPE_NODE, "kern", NULL,
2043: NULL, 0, NULL, 0,
2044: CTL_KERN, CTL_EOL);
2045:
2046: sysctl_createv(clog, 0, NULL, NULL,
2047: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2048: CTLTYPE_INT, "somaxkva",
2049: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2050: "used for socket buffers"),
1.94 yamt 2051: sysctl_kern_somaxkva, 0, NULL, 0,
2052: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
2053: }
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